{"id":15297,"date":"2025-06-23T11:26:20","date_gmt":"2025-06-23T11:26:20","guid":{"rendered":"https:\/\/www.powerjacks.com\/%e6%94%af%e6%8c%81\/%e5%b8%b8%e8%a7%81%e9%97%ae%e9%a2%98\/"},"modified":"2026-04-30T13:48:41","modified_gmt":"2026-04-30T13:48:41","slug":"%e5%b8%b8%e8%a7%81%e9%97%ae%e9%a2%98","status":"publish","type":"page","link":"https:\/\/www.powerjacks.com\/zh-hans\/%e6%94%af%e6%8c%81\/%e5%b8%b8%e8%a7%81%e9%97%ae%e9%a2%98\/","title":{"rendered":"\u5e38\u89c1\u95ee\u9898"},"content":{"rendered":"\n<div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\" style=\"padding-right:var(--wp--preset--spacing--40);padding-left:var(--wp--preset--spacing--40)\">\n<div class=\"wp-block-cover\" style=\"min-height:200px;aspect-ratio:unset;\"><img decoding=\"async\" width=\"1536\" height=\"2048\" class=\"wp-block-cover__image-background wp-image-2634 size-full\" alt=\"\" src=\"https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/06\/Downloads-Videos-scaled.jpg.webp\" data-object-fit=\"cover\" srcset=\"https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/06\/Downloads-Videos-scaled.jpg.webp 1536w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/06\/Downloads-Videos-225x300.jpg.webp 225w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/06\/Downloads-Videos-768x1024.jpg.webp 768w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/06\/Downloads-Videos-1152x1536.jpg.webp 1152w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/06\/Downloads-Videos-54x72.jpg.webp 54w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/06\/Downloads-Videos-131x175.jpg.webp 131w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/06\/Downloads-Videos-122x162.jpg.webp 122w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/06\/Downloads-Videos-60x80.jpg.webp 60w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/06\/Downloads-Videos-548x731.jpg.webp 548w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/06\/Downloads-Videos-49x65.jpg.webp 49w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/06\/Downloads-Videos-600x800.jpg.webp 600w\" sizes=\"(max-width: 1536px) 100vw, 1536px\" \/><span aria-hidden=\"true\" class=\"wp-block-cover__background has-background-dim-100 has-background-dim wp-block-cover__gradient-background has-background-gradient has-light-green-gradient-background\"><\/span><div class=\"wp-block-cover__inner-container has-global-padding is-layout-constrained wp-block-cover-is-layout-constrained\">\n<h1 class=\"wp-block-heading has-text-align-center\">\u5e38\u89c1\u95ee\u9898<\/h1>\n<\/div><\/div>\n<\/div>\n\n<div class=\"wp-block-group has-global-padding is-layout-constrained wp-container-core-group-is-layout-69a06032 wp-block-group-is-layout-constrained\" style=\"padding-top:var(--wp--preset--spacing--60);padding-bottom:var(--wp--preset--spacing--60)\">\n<p class=\"has-text-align-center\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.503), 20px);\"><strong>\u67e5\u627e\u6709\u5173\u6211\u4eec\u7cfb\u5217\u4ea7\u54c1\u7684\u4e00\u4e9b\u5e38\u89c1\u95ee\u9898\u7684\u7b54\u6848\u3002\u4ece\u6280\u672f\u89c4\u683c\u5230\u64cd\u4f5c\u95ee\u9898\uff0c\u518d\u5230\u672f\u8bed\u8bf4\u660e\u3002 <\/strong><\/p>\n<\/div>\n        <faq-filter\r\n            section-title=\"Can Screw Jacks Operate where Vibration is Present?\"\r\n            :faq-filter='{&quot;faqs&quot;:[{&quot;faq&quot;:{&quot;ID&quot;:889,&quot;post_author&quot;:&quot;102&quot;,&quot;post_date&quot;:&quot;2018-09-05 09:34:45&quot;,&quot;post_date_gmt&quot;:&quot;2018-09-05 09:34:45&quot;,&quot;post_content&quot;:&quot;&lt;!-- wp:image {\\&quot;id\\&quot;:12787,\\&quot;width\\&quot;:\\&quot;550px\\&quot;,\\&quot;height\\&quot;:\\&quot;auto\\&quot;,\\&quot;sizeSlug\\&quot;:\\&quot;full\\&quot;,\\&quot;linkDestination\\&quot;:\\&quot;none\\&quot;} --&gt;\\n&lt;figure class=\\&quot;wp-block-image size-full is-resized\\&quot;&gt;&lt;img src=\\&quot;https:\\\/\\\/www.powerjacks.com\\\/wp-content\\\/uploads\\\/2018\\\/09\\\/Linear_Actuator-Rolaram-XSection-00-1200x710-1.jpg\\&quot; alt=\\&quot;FAQ, Linear Actuator, Rolaram, Cross Section\\&quot; class=\\&quot;wp-image-12787\\&quot; style=\\&quot;width:550px;height:auto\\&quot;\\\/&gt;&lt;\\\/figure&gt;\\n&lt;!-- \\\/wp:image --&gt;\\n\\n&lt;\\\/p&gt;\\n&lt;p&gt;The electric motors rotation drives the primary gear of the gearbox, which through a single or more gear stages turns the gearboxes output shaft (final gear). This rotates in unison with the lead screw, as the lead screw is fixed in place to the gear. When the lead screw rotates the lead nut that mates with the lead screw translates along the screw and so converts rotary motion to linear motion.&lt;\\\/p&gt;\\n&lt;p&gt;The lead nut is fixed to the \\u201cram\\u201d or \\u201cinner tube\\u201d so this item translates with the nut. Note that for linear motion to occur the ram (including lead nut) must be restrained from rotating with the lead screw. This is usually done by fixing the end of the ram via its end connection to the object that needs to be moved. If the object is in free space then the actuators ram needs an anti-rotation device fitted. The outer tube seals the lead screw into the ram which protects the screw from dirt, debris and damage and acts as a lubrication store. In addition the exposed portion of the ram can have a flexible covering attached to provide extra protection (e.g. bellows boot).&lt;\\\/p&gt;&quot;,&quot;post_title&quot;:&quot;How Does an Electric Linear Actuator Operate?&quot;,&quot;post_excerpt&quot;:&quot;&quot;,&quot;post_status&quot;:&quot;publish&quot;,&quot;comment_status&quot;:&quot;open&quot;,&quot;ping_status&quot;:&quot;closed&quot;,&quot;post_password&quot;:&quot;&quot;,&quot;post_name&quot;:&quot;2018-09-05-how-does-an-electric-linear-actuator-operate&quot;,&quot;to_ping&quot;:&quot;&quot;,&quot;pinged&quot;:&quot;&quot;,&quot;post_modified&quot;:&quot;2025-12-04 13:36:34&quot;,&quot;post_modified_gmt&quot;:&quot;2025-12-04 13:36:34&quot;,&quot;post_content_filtered&quot;:&quot;&quot;,&quot;post_parent&quot;:0,&quot;guid&quot;:&quot;https:\\\/\\\/www.laszlo.www.powerjacks.com\\\/faq\\\/2018-09-05-how-does-an-electric-linear-actuator-operate\\\/&quot;,&quot;menu_order&quot;:0,&quot;post_type&quot;:&quot;faq&quot;,&quot;post_mime_type&quot;:&quot;&quot;,&quot;comment_count&quot;:&quot;0&quot;,&quot;filter&quot;:&quot;raw&quot;}},{&quot;faq&quot;:{&quot;ID&quot;:874,&quot;post_author&quot;:&quot;102&quot;,&quot;post_date&quot;:&quot;2018-08-29 13:54:40&quot;,&quot;post_date_gmt&quot;:&quot;2018-08-29 13:54:40&quot;,&quot;post_content&quot;:&quot;&lt;!-- wp:image {\\&quot;id\\&quot;:12804,\\&quot;width\\&quot;:\\&quot;494px\\&quot;,\\&quot;height\\&quot;:\\&quot;auto\\&quot;,\\&quot;sizeSlug\\&quot;:\\&quot;full\\&quot;,\\&quot;linkDestination\\&quot;:\\&quot;none\\&quot;} --&gt;\\n&lt;figure class=\\&quot;wp-block-image size-full is-resized\\&quot;&gt;&lt;img src=\\&quot;https:\\\/\\\/www.powerjacks.com\\\/wp-content\\\/uploads\\\/2018\\\/08\\\/ScrewJack-Translating_Screw-Movements-00-1000x1000-1.jpg\\&quot; alt=\\&quot;FAQ, Screw Jacks, Translating Screw, Movement\\&quot; class=\\&quot;wp-image-12804\\&quot; style=\\&quot;width:494px;height:auto\\&quot;\\\/&gt;&lt;\\\/figure&gt;\\n&lt;!-- \\\/wp:image --&gt;\\n\\n&lt;p&gt;&lt;strong&gt;In Brief:&lt;\\\/strong&gt; The lead screw translates through the body of the screw jack when the lead screw is prevented from rotating with the worm gear. This is typically done by fixing the end of the lead screw to the structure that needs to be moved linearly.&lt;\\\/p&gt;\\n&lt;p&gt;&lt;strong&gt;In Detail:&lt;\\\/strong&gt; When a screw jack unit is operated, the rotation of the worm shaft causes the worm gear to rotate. For translating screw jacks the worm gear is threaded to accommodate the lead screw thread. As the worm gear turns, the friction forces on the screw thread act to turn the screw also. The greater the load on the screw jack unit, the greater the tendency of the screw to turn. It is obvious that if the screw turns with the nut (worm gear), it will not raise the load. In those cases where a single unit is used, and where the load cannot be restrained from turning, it is necessary to use a screw jack with an anti-rotation mechanism (keyed screw jack). Lead screw key torque (refer to Screw Jack Design Guide) must be checked as excessively heavy unguided loads could break the Anti-rotation mechanism (key).&lt;\\\/p&gt;&quot;,&quot;post_title&quot;:&quot;How Does A Translating Screw Jack Work?&quot;,&quot;post_excerpt&quot;:&quot;&quot;,&quot;post_status&quot;:&quot;publish&quot;,&quot;comment_status&quot;:&quot;open&quot;,&quot;ping_status&quot;:&quot;closed&quot;,&quot;post_password&quot;:&quot;&quot;,&quot;post_name&quot;:&quot;2018-08-29-how-does-a-translating-screw-jack-work&quot;,&quot;to_ping&quot;:&quot;&quot;,&quot;pinged&quot;:&quot;&quot;,&quot;post_modified&quot;:&quot;2025-12-04 15:08:20&quot;,&quot;post_modified_gmt&quot;:&quot;2025-12-04 15:08:20&quot;,&quot;post_content_filtered&quot;:&quot;&quot;,&quot;post_parent&quot;:0,&quot;guid&quot;:&quot;https:\\\/\\\/www.laszlo.www.powerjacks.com\\\/faq\\\/2018-08-29-how-does-a-translating-screw-jack-work\\\/&quot;,&quot;menu_order&quot;:1,&quot;post_type&quot;:&quot;faq&quot;,&quot;post_mime_type&quot;:&quot;&quot;,&quot;comment_count&quot;:&quot;0&quot;,&quot;filter&quot;:&quot;raw&quot;}},{&quot;faq&quot;:{&quot;ID&quot;:867,&quot;post_author&quot;:&quot;102&quot;,&quot;post_date&quot;:&quot;2018-08-29 14:12:56&quot;,&quot;post_date_gmt&quot;:&quot;2018-08-29 14:12:56&quot;,&quot;post_content&quot;:&quot;&lt;!-- wp:image {\\&quot;id\\&quot;:12813,\\&quot;width\\&quot;:\\&quot;495px\\&quot;,\\&quot;height\\&quot;:\\&quot;auto\\&quot;,\\&quot;sizeSlug\\&quot;:\\&quot;full\\&quot;,\\&quot;linkDestination\\&quot;:\\&quot;none\\&quot;} --&gt;\\n&lt;figure class=\\&quot;wp-block-image size-full is-resized\\&quot;&gt;&lt;img src=\\&quot;https:\\\/\\\/www.powerjacks.com\\\/wp-content\\\/uploads\\\/2018\\\/08\\\/ScrewJack-Rotating_Screw-Movements-00-1000x1000-1.jpg\\&quot; alt=\\&quot;FAQ, Screw Jacks, Rotating Screw, Movement\\&quot; class=\\&quot;wp-image-12813\\&quot; style=\\&quot;width:495px;height:auto\\&quot;\\\/&gt;&lt;\\\/figure&gt;\\n&lt;!-- \\\/wp:image --&gt;\\n\\n&lt;p&gt;&lt;strong&gt;In Brief:&lt;\\\/strong&gt; When the worm shaft is rotated the lead screw rotates in the body of the screw jack at the same rate as the worm gear. The nut on the lead screw moves in a linear direction along the screw when fixed to a structure that prevents it from rotating with the screw. This design is also available with a \\u201cSafety Nut\\u201d.&lt;\\\/p&gt;\\n&lt;p&gt;&lt;strong&gt;In Detail:&lt;\\\/strong&gt; When a screw jack unit is operated, the rotation of the worm shaft causes the worm gear to rotate. For rotating screw jacks the lead screw is fixed to the worm gear and they rotate at the same speed. As the worm gear turns, the friction forces on the screw thread act to turn the nut also. The greater the load on the screw jack unit, the greater the tendency of the nut to turn. It is obvious that if the nut turns with the screw, it will not raise the load. Therefore the nut needs to be fixed to a structure to prevent rotation. The restraining torque required for the structure, also known as the \\u201clead screw key torque\\u201d can be found in the Screw Jack Design Guide.&lt;\\\/p&gt;&quot;,&quot;post_title&quot;:&quot;How Does A Rotating Screw Jack Work?&quot;,&quot;post_excerpt&quot;:&quot;&quot;,&quot;post_status&quot;:&quot;publish&quot;,&quot;comment_status&quot;:&quot;open&quot;,&quot;ping_status&quot;:&quot;closed&quot;,&quot;post_password&quot;:&quot;&quot;,&quot;post_name&quot;:&quot;2018-08-29-how-does-a-rotating-screw-jack-work&quot;,&quot;to_ping&quot;:&quot;&quot;,&quot;pinged&quot;:&quot;&quot;,&quot;post_modified&quot;:&quot;2025-12-04 15:11:07&quot;,&quot;post_modified_gmt&quot;:&quot;2025-12-04 15:11:07&quot;,&quot;post_content_filtered&quot;:&quot;&quot;,&quot;post_parent&quot;:0,&quot;guid&quot;:&quot;https:\\\/\\\/www.laszlo.www.powerjacks.com\\\/faq\\\/2018-08-29-how-does-a-rotating-screw-jack-work\\\/&quot;,&quot;menu_order&quot;:2,&quot;post_type&quot;:&quot;faq&quot;,&quot;post_mime_type&quot;:&quot;&quot;,&quot;comment_count&quot;:&quot;0&quot;,&quot;filter&quot;:&quot;raw&quot;}},{&quot;faq&quot;:{&quot;ID&quot;:857,&quot;post_author&quot;:&quot;102&quot;,&quot;post_date&quot;:&quot;2024-09-11 09:20:00&quot;,&quot;post_date_gmt&quot;:&quot;2024-09-11 09:20:00&quot;,&quot;post_content&quot;:&quot;&lt;p&gt;Contact our sales team by email (sales@powerjacks.com) or phone (+44 (0)1224 968 968) with details of what you would like to purchase. You will then receive a quotation.&lt;\\\/p&gt;\\n&lt;p&gt;Let us know when you are ready to go ahead with the order by sending a communication with your purchase order. We will confirm receipt of the order and send a sales acknowledgment.&lt;\\\/p&gt;\\n&lt;p&gt;Unless otherwise agreed, first orders on all new accounts will be actioned on a Proforma basis and payment will be due at time of order placement. Upon receipt of payment, the purchase order will be processed and delivery lead time confirmed. Provision of a credit limit will then be reviewed following a credit check. Initial invoices can be paid by credit\\\/debit card as required. Credit card charge applies.&lt;\\\/p&gt;\\n&lt;p&gt;If you already have an account with us, a sales invoice will be issued.&lt;\\\/p&gt;\\n&lt;p&gt;Your order will be produced and delivered as per agreed terms.&lt;\\\/p&gt;\\n&quot;,&quot;post_title&quot;:&quot;How do I buy from Power Jacks?&quot;,&quot;post_excerpt&quot;:&quot;&quot;,&quot;post_status&quot;:&quot;publish&quot;,&quot;comment_status&quot;:&quot;open&quot;,&quot;ping_status&quot;:&quot;closed&quot;,&quot;post_password&quot;:&quot;&quot;,&quot;post_name&quot;:&quot;2024-09-11-how-do-i-buy-from-power-jacks&quot;,&quot;to_ping&quot;:&quot;&quot;,&quot;pinged&quot;:&quot;&quot;,&quot;post_modified&quot;:&quot;2025-08-15 09:29:09&quot;,&quot;post_modified_gmt&quot;:&quot;2025-08-15 09:29:09&quot;,&quot;post_content_filtered&quot;:&quot;&quot;,&quot;post_parent&quot;:0,&quot;guid&quot;:&quot;https:\\\/\\\/www.laszlo.www.powerjacks.com\\\/faq\\\/2024-09-11-how-do-i-buy-from-power-jacks\\\/&quot;,&quot;menu_order&quot;:3,&quot;post_type&quot;:&quot;faq&quot;,&quot;post_mime_type&quot;:&quot;&quot;,&quot;comment_count&quot;:&quot;0&quot;,&quot;filter&quot;:&quot;raw&quot;}},{&quot;faq&quot;:{&quot;ID&quot;:936,&quot;post_author&quot;:&quot;102&quot;,&quot;post_date&quot;:&quot;2018-08-29 14:00:16&quot;,&quot;post_date_gmt&quot;:&quot;2018-08-29 14:00:16&quot;,&quot;post_content&quot;:&quot;&lt;p&gt;Standard machine screw jacks, machine screw jacks with anti-backlash and ball screw jacks must be considered separately, as the normal backlash will vary due to different constructions.&lt;\\\/p&gt;\\n&lt;p&gt;&lt;strong&gt;Backlash in Standard Machine Screw Jacks&lt;\\\/strong&gt;&lt;br \\\/&gt;\\nMachine screw jacks have backlash due not only to normal manufacturing tolerances, but to the fact that there must be some clearances to prevent binding and galling when the screw jack unit is under load (for values refer to E-Series Screw Jacks brochure (P25)). Usually, the backlash is not a problem unless the load on the screw jack unit changes between compression and tension. If a problem does exist, then a unit with the anti-backlash feature should be considered.&lt;\\\/p&gt;\\n&lt;p&gt;&lt;strong&gt;Screw Jacks with the Anti-Backlash Device&lt;\\\/strong&gt;&lt;br \\\/&gt;\\nThe anti-backlash device reduces the axial backlash in the lifting screw and nut assembly to a regulated minimum. As the backlash will increase as the lifting screw thread on the gear wears the anti-backlash device can be adjusted to remove this normal condition.&lt;\\\/p&gt;\\n&lt;p&gt;&lt;strong&gt;Ball Screw Jacks&lt;\\\/strong&gt;&lt;br \\\/&gt;\\nBall screw jacks do not have an anti-backlash option similar to the machine screw jacks. Instead for zero or reduced axial play ball screw jacks can be ordered with a pre-loaded ball nut (refer to E-Series Screw Jacks brochure (P45)).&lt;\\\/p&gt;\\n&quot;,&quot;post_title&quot;:&quot;What is the Backlash in a Screw Jack?&quot;,&quot;post_excerpt&quot;:&quot;&quot;,&quot;post_status&quot;:&quot;publish&quot;,&quot;comment_status&quot;:&quot;open&quot;,&quot;ping_status&quot;:&quot;closed&quot;,&quot;post_password&quot;:&quot;&quot;,&quot;post_name&quot;:&quot;2018-08-29-what-is-the-backlash-in-a-screw-jack&quot;,&quot;to_ping&quot;:&quot;&quot;,&quot;pinged&quot;:&quot;&quot;,&quot;post_modified&quot;:&quot;2025-08-15 09:36:27&quot;,&quot;post_modified_gmt&quot;:&quot;2025-08-15 09:36:27&quot;,&quot;post_content_filtered&quot;:&quot;&quot;,&quot;post_parent&quot;:0,&quot;guid&quot;:&quot;https:\\\/\\\/www.laszlo.www.powerjacks.com\\\/faq\\\/2018-08-29-what-is-the-backlash-in-a-screw-jack\\\/&quot;,&quot;menu_order&quot;:4,&quot;post_type&quot;:&quot;faq&quot;,&quot;post_mime_type&quot;:&quot;&quot;,&quot;comment_count&quot;:&quot;0&quot;,&quot;filter&quot;:&quot;raw&quot;}},{&quot;faq&quot;:{&quot;ID&quot;:850,&quot;post_author&quot;:&quot;102&quot;,&quot;post_date&quot;:&quot;2018-08-29 13:55:00&quot;,&quot;post_date_gmt&quot;:&quot;2018-08-29 13:55:00&quot;,&quot;post_content&quot;:&quot;&lt;!-- wp:image {\\&quot;id\\&quot;:11419,\\&quot;sizeSlug\\&quot;:\\&quot;full\\&quot;,\\&quot;linkDestination\\&quot;:\\&quot;none\\&quot;} --&gt;\\n&lt;figure class=\\&quot;wp-block-image size-full\\&quot;&gt;&lt;img src=\\&quot;https:\\\/\\\/www.powerjacks.com\\\/wp-content\\\/uploads\\\/2018\\\/08\\\/cmt0025-c0a-xs-320x240-w320h240.jpg\\&quot; alt=\\&quot;\\&quot; class=\\&quot;wp-image-11419\\&quot;\\\/&gt;&lt;\\\/figure&gt;\\n&lt;!-- \\\/wp:image --&gt;\\n\\n&lt;p&gt;For reduced axial backlash of the lead screw in the screw jack select a model with the \\u201cAnti-Backlash\\u201d mechanism. This is typically used when the load direction changes from tension to compression and minimal axial backlash is required. This design is only available for translating screw jacks. It can be combined with Anti-Rotation mechanism as well.&lt;\\\/p&gt;&quot;,&quot;post_title&quot;:&quot;When Do I Use An Anti-Backlash Screw Jack?&quot;,&quot;post_excerpt&quot;:&quot;&quot;,&quot;post_status&quot;:&quot;publish&quot;,&quot;comment_status&quot;:&quot;open&quot;,&quot;ping_status&quot;:&quot;closed&quot;,&quot;post_password&quot;:&quot;&quot;,&quot;post_name&quot;:&quot;2018-08-29-when-do-i-use-an-anti-backlash-screw-jack&quot;,&quot;to_ping&quot;:&quot;&quot;,&quot;pinged&quot;:&quot;&quot;,&quot;post_modified&quot;:&quot;2025-11-21 15:02:15&quot;,&quot;post_modified_gmt&quot;:&quot;2025-11-21 15:02:15&quot;,&quot;post_content_filtered&quot;:&quot;&quot;,&quot;post_parent&quot;:0,&quot;guid&quot;:&quot;https:\\\/\\\/www.laszlo.www.powerjacks.com\\\/faq\\\/2018-08-29-when-do-i-use-an-anti-backlash-screw-jack\\\/&quot;,&quot;menu_order&quot;:5,&quot;post_type&quot;:&quot;faq&quot;,&quot;post_mime_type&quot;:&quot;&quot;,&quot;comment_count&quot;:&quot;0&quot;,&quot;filter&quot;:&quot;raw&quot;}},{&quot;faq&quot;:{&quot;ID&quot;:937,&quot;post_author&quot;:&quot;102&quot;,&quot;post_date&quot;:&quot;2018-09-18 10:40:18&quot;,&quot;post_date_gmt&quot;:&quot;2018-09-18 10:40:18&quot;,&quot;post_content&quot;:&quot;&lt;!-- wp:image {\\&quot;id\\&quot;:12822,\\&quot;width\\&quot;:\\&quot;428px\\&quot;,\\&quot;height\\&quot;:\\&quot;auto\\&quot;,\\&quot;sizeSlug\\&quot;:\\&quot;full\\&quot;,\\&quot;linkDestination\\&quot;:\\&quot;none\\&quot;} --&gt;\\n&lt;figure class=\\&quot;wp-block-image size-full is-resized\\&quot;&gt;&lt;img src=\\&quot;https:\\\/\\\/www.powerjacks.com\\\/wp-content\\\/uploads\\\/2018\\\/09\\\/ScrewJack-Anti-Backlash-Diagram-00-1100x1100-1.jpg\\&quot; alt=\\&quot;FAQ, Screw Jack, Anti-Backlash, Diagram\\&quot; class=\\&quot;wp-image-12822\\&quot; style=\\&quot;width:428px;height:auto\\&quot;\\\/&gt;&lt;\\\/figure&gt;\\n&lt;!-- \\\/wp:image --&gt;\\n\\n&lt;p&gt;When the screw (1) is under a compression load, the bottom of its thread surfaces are supported by the top thread surfaces of the worm gear (2) at point (A). The anti-backlash nut (3), being pinned to the worm gear and floating on these pins and being adjusted downward by the shell cap, forces its bottom thread surfaces against the upper thread surfaces of the lifting screw at point (B). Thus, backlash between worm gear threads is reduced to a regulated minimum (for values refer to Screw Jack Design Guide).&lt;\\\/p&gt;\\n&lt;p&gt;When wear occurs in the worm gear threads and on the load carrying surfaces of the lifting screw thread, the load carrying thickness of the worm gear thread will be reduced. This wear will create a gap at point (B) and provide backlash equal to the wear on the threads.&lt;\\\/p&gt;\\n&lt;p&gt;Under compression load, the lifting screw will no longer be in contact with the lower thread surface of the anti-backlash nut. Under this condition, backlash will be present when a tension load is applied. The anti-backlash feature can be maintained simply by adjusting the shell cap until the desired amount of backlash is achieved.&lt;\\\/p&gt;\\n&lt;p&gt;To avoid binding and excessive wear do not adjust lifting screw backlash to less than 0.013mm (0.0005\\u201d).&lt;\\\/p&gt;\\n&lt;p&gt;This will reduce the calculated separation (C) between the anti-backlash nut and worm gear and will reduce the backlash between the worm gear threads and the lifting screw to the desired minimum value. When separation (C) has been reduced to zero, wear has taken place. Replace the worm gear (2) at this point. This feature acts as a built in safety device which can be used to provide wear indication for critical applications.&lt;\\\/p&gt;\\n&lt;p&gt;&lt;strong&gt;Ball Screw Jacks&lt;\\\/strong&gt;&lt;br \\\/&gt;For zero or reduced axial play on ball screw jacks a pre-loaded ball nut should be requested (refer to Screw Jack Design Guide for more details).&lt;\\\/p&gt;&quot;,&quot;post_title&quot;:&quot;How Does the Anti-Backlash Device Work?&quot;,&quot;post_excerpt&quot;:&quot;&quot;,&quot;post_status&quot;:&quot;publish&quot;,&quot;comment_status&quot;:&quot;open&quot;,&quot;ping_status&quot;:&quot;closed&quot;,&quot;post_password&quot;:&quot;&quot;,&quot;post_name&quot;:&quot;2018-09-18-how-does-the-anti-backlash-device-work&quot;,&quot;to_ping&quot;:&quot;&quot;,&quot;pinged&quot;:&quot;&quot;,&quot;post_modified&quot;:&quot;2025-12-04 15:27:19&quot;,&quot;post_modified_gmt&quot;:&quot;2025-12-04 15:27:19&quot;,&quot;post_content_filtered&quot;:&quot;&quot;,&quot;post_parent&quot;:0,&quot;guid&quot;:&quot;https:\\\/\\\/www.laszlo.www.powerjacks.com\\\/faq\\\/2018-09-18-how-does-the-anti-backlash-device-work\\\/&quot;,&quot;menu_order&quot;:6,&quot;post_type&quot;:&quot;faq&quot;,&quot;post_mime_type&quot;:&quot;&quot;,&quot;comment_count&quot;:&quot;0&quot;,&quot;filter&quot;:&quot;raw&quot;}},{&quot;faq&quot;:{&quot;ID&quot;:932,&quot;post_author&quot;:&quot;102&quot;,&quot;post_date&quot;:&quot;2018-08-29 13:59:06&quot;,&quot;post_date_gmt&quot;:&quot;2018-08-29 13:59:06&quot;,&quot;post_content&quot;:&quot;&lt;p&gt;For all machine screw jacks a keyed lifting screw is available. Note the keyway in the screw causes greater than normal wear on the internal threads of the worm gear.&lt;\\\/p&gt;\\n&lt;p&gt;For ball screw jacks the lifting screw cannot be keyed, as the keyway would interrupt the ball track, permitting loss of the recirculating balls. Instead the option of a square anti-rotation tube can be fitted to ball screw jacks to prevent rotation (refer to E-Series Screw Jacks brochure (P47) For further details consult Power Jacks Ltd.&lt;\\\/p&gt;\\n&quot;,&quot;post_title&quot;:&quot;Can a Screw Jack be Supplied with a Lifting Screw to Prevent Rotation?&quot;,&quot;post_excerpt&quot;:&quot;&quot;,&quot;post_status&quot;:&quot;publish&quot;,&quot;comment_status&quot;:&quot;open&quot;,&quot;ping_status&quot;:&quot;closed&quot;,&quot;post_password&quot;:&quot;&quot;,&quot;post_name&quot;:&quot;2018-08-29-can-a-screw-jack-be-supplied-with-a-lifting-screw-to-prevent-rotation&quot;,&quot;to_ping&quot;:&quot;&quot;,&quot;pinged&quot;:&quot;&quot;,&quot;post_modified&quot;:&quot;2025-08-15 09:36:51&quot;,&quot;post_modified_gmt&quot;:&quot;2025-08-15 09:36:51&quot;,&quot;post_content_filtered&quot;:&quot;&quot;,&quot;post_parent&quot;:0,&quot;guid&quot;:&quot;https:\\\/\\\/www.laszlo.www.powerjacks.com\\\/faq\\\/2018-08-29-can-a-screw-jack-be-supplied-with-a-lifting-screw-to-prevent-rotation\\\/&quot;,&quot;menu_order&quot;:7,&quot;post_type&quot;:&quot;faq&quot;,&quot;post_mime_type&quot;:&quot;&quot;,&quot;comment_count&quot;:&quot;0&quot;,&quot;filter&quot;:&quot;raw&quot;}},{&quot;faq&quot;:{&quot;ID&quot;:931,&quot;post_author&quot;:&quot;102&quot;,&quot;post_date&quot;:&quot;2018-08-29 13:58:42&quot;,&quot;post_date_gmt&quot;:&quot;2018-08-29 13:58:42&quot;,&quot;post_content&quot;:&quot;&lt;p&gt;This design is only available for translating screw jacks. If the structure\\\/object connected to the lead screw is not prevented from rotating or the lead screw is not always in contact with the structure then a screw jack with an \\u201cAnti-Rotation\\u201d mechanism (keyed) should be used. For machine screw jacks the mechanism uses an internal key to prevent the lead screw from rotating. For ball screw jacks a guided element fixed to the ball screw is used to prevent the ball screw from rotating.&lt;\\\/p&gt;\\n&lt;p&gt;What other design features are available? Other designs &amp;amp; features available include:&lt;\\\/p&gt;\\n&lt;ol&gt;\\n&lt;li&gt;Bellows boot screw protection&lt;\\\/li&gt;\\n&lt;li&gt;Safety nut (translating or rotating screw types)&lt;\\\/li&gt;\\n&lt;li&gt;Motor adapter kit&lt;\\\/li&gt;\\n&lt;li&gt;Double Clevis - reinforced cover pipe with clevis&lt;\\\/li&gt;\\n&lt;li&gt;Anti-corrosion protection. As well as stainless steel various platings and paint finishes are available&lt;\\\/li&gt;\\n&lt;li&gt;Trunnion mounts for base of screw jack&lt;\\\/li&gt;\\n&lt;li&gt;Limit switch kits (mechanical, proximity and rotary cam types)&lt;\\\/li&gt;\\n&lt;li&gt;Thrust rings for screw jacks that need to withstand high shock loads&lt;\\\/li&gt;\\n&lt;li&gt;Reinforced gearbox housing&lt;\\\/li&gt;\\n&lt;li&gt;Upgraded rotating screw jack for improved column strength for compressive load&lt;\\\/li&gt;\\n&lt;\\\/ol&gt;\\n&lt;p&gt;Have a look at our E-Series Screw Jacks brochure for lots more ideas and product specifications. If your requirement is not listed then just ask Power Jacks if it possible as chances are we have done it before.&lt;\\\/p&gt;\\n&quot;,&quot;post_title&quot;:&quot;When Do I Use A Screw Jack with Anti-Rotation (Keyed) Mechanism?&quot;,&quot;post_excerpt&quot;:&quot;&quot;,&quot;post_status&quot;:&quot;publish&quot;,&quot;comment_status&quot;:&quot;open&quot;,&quot;ping_status&quot;:&quot;closed&quot;,&quot;post_password&quot;:&quot;&quot;,&quot;post_name&quot;:&quot;2018-08-29-when-do-i-use-a-screw-jack-with-anti-rotation-keyed-mechanism&quot;,&quot;to_ping&quot;:&quot;&quot;,&quot;pinged&quot;:&quot;&quot;,&quot;post_modified&quot;:&quot;2025-08-15 09:36:57&quot;,&quot;post_modified_gmt&quot;:&quot;2025-08-15 09:36:57&quot;,&quot;post_content_filtered&quot;:&quot;&quot;,&quot;post_parent&quot;:0,&quot;guid&quot;:&quot;https:\\\/\\\/www.laszlo.www.powerjacks.com\\\/faq\\\/2018-08-29-when-do-i-use-a-screw-jack-with-anti-rotation-keyed-mechanism\\\/&quot;,&quot;menu_order&quot;:8,&quot;post_type&quot;:&quot;faq&quot;,&quot;post_mime_type&quot;:&quot;&quot;,&quot;comment_count&quot;:&quot;0&quot;,&quot;filter&quot;:&quot;raw&quot;}},{&quot;faq&quot;:{&quot;ID&quot;:952,&quot;post_author&quot;:&quot;102&quot;,&quot;post_date&quot;:&quot;2018-08-29 14:04:42&quot;,&quot;post_date_gmt&quot;:&quot;2018-08-29 14:04:42&quot;,&quot;post_content&quot;:&quot;&lt;p&gt;Generally, standard strokes \\\/ raises are:&lt;\\\/p&gt;\\n&lt;ul&gt;\\n&lt;li&gt;Up to 1000mm on 5kN E-Series metric screw jacks&lt;\\\/li&gt;\\n&lt;li&gt;Up to 2500mm on 10kN E-Series metric screw jacks&lt;\\\/li&gt;\\n&lt;li&gt;18 inches on 1\\\/4 tom M-Series imperial (inch) screw jacks&lt;\\\/li&gt;\\n&lt;li&gt;40 inches on 1\\\/2 ton M-Series imperial (inch)screw jacks&lt;\\\/li&gt;\\n&lt;li&gt;98 inches on 1 ton M-Series imperial (inch) screw jacks&lt;\\\/li&gt;\\n&lt;li&gt;55000mm on 25kN and above E &amp;amp; S Series metric screw jacks&lt;\\\/li&gt;\\n&lt;li&gt;215 inches on 2 Ton and above M-Series imperial (inch) screw jacks&lt;\\\/li&gt;\\n&lt;\\\/ul&gt;\\n&lt;p&gt;Larger Screw Jacks have their maximum raise \\\/ stroke available limited only by the available length of bar stock from suppliers (note - special steel production runs can be organised for special applications) and the practical ability to handle, machine and transport the lead screw and the complete screw jack. Practical lengths will also be affected by whether the screw is to be subjected to compression or tension loads. Depending on diameter the length can be limited due to deformation of material in the machining process or column strength of the screw when subjected to compression loads.&lt;\\\/p&gt;\\n&lt;p&gt;Long raise applications should be checked with Power Jacks for the following:a) Side loads on extended screw.b) Column strength of screw.c) Thermal rating of screw and nut.Power Jacks recommend guides be used on all applications. The longer the raise, the more important this becomes.&lt;\\\/p&gt;\\n&quot;,&quot;post_title&quot;:&quot;What is the Maximum Raise or Working Stroke for a Screw Jack?&quot;,&quot;post_excerpt&quot;:&quot;&quot;,&quot;post_status&quot;:&quot;publish&quot;,&quot;comment_status&quot;:&quot;open&quot;,&quot;ping_status&quot;:&quot;closed&quot;,&quot;post_password&quot;:&quot;&quot;,&quot;post_name&quot;:&quot;2018-08-29-what-is-the-maximum-raise-or-working-stroke-for-a-screw-jack&quot;,&quot;to_ping&quot;:&quot;&quot;,&quot;pinged&quot;:&quot;&quot;,&quot;post_modified&quot;:&quot;2025-08-15 09:36:22&quot;,&quot;post_modified_gmt&quot;:&quot;2025-08-15 09:36:22&quot;,&quot;post_content_filtered&quot;:&quot;&quot;,&quot;post_parent&quot;:0,&quot;guid&quot;:&quot;https:\\\/\\\/www.laszlo.www.powerjacks.com\\\/faq\\\/2018-08-29-what-is-the-maximum-raise-or-working-stroke-for-a-screw-jack\\\/&quot;,&quot;menu_order&quot;:9,&quot;post_type&quot;:&quot;faq&quot;,&quot;post_mime_type&quot;:&quot;&quot;,&quot;comment_count&quot;:&quot;0&quot;,&quot;filter&quot;:&quot;raw&quot;}},{&quot;faq&quot;:{&quot;ID&quot;:934,&quot;post_author&quot;:&quot;102&quot;,&quot;post_date&quot;:&quot;2018-08-29 13:59:49&quot;,&quot;post_date_gmt&quot;:&quot;2018-08-29 13:59:49&quot;,&quot;post_content&quot;:&quot;&lt;p&gt;Screw Jacks with 24:1 and 25:1 gear ratios are considered self-locking in most cases.&lt;\\\/p&gt;\\n&lt;p&gt;The following screw jack models are considered not to be self-locking:&lt;\\\/p&gt;\\n&lt;ul&gt;\\n&lt;li&gt;All Metric and Imperial ball screw jacks&lt;\\\/li&gt;\\n&lt;li&gt;The M2555 (1\\\/4 ton) screw jacks with 5:1 gear ratio&lt;\\\/li&gt;\\n&lt;li&gt;The E2625 (5kN) &amp;amp; M2625 (1\\\/2 ton) screw jacks with 5:1 gear ratio&lt;\\\/li&gt;\\n&lt;li&gt;The E2501 (5kN) &amp;amp; M2501 (1-ton) screw jacks with 5:1 gear ratio&lt;\\\/li&gt;\\n&lt;li&gt;In some cases the E1802 (25kN), M1802 &amp;amp; M9002 (2 ton) screw jacks with 6:1 gear ratio. For advice on an application basis consult Power Jacks Ltd&lt;\\\/li&gt;\\n&lt;li&gt;In some cases the E1805 (50kN) &amp;amp; M1805 (5 ton) screw jacks with 6:1 gear ratio. For advice on an application basis consult Power Jacks Ltd&lt;\\\/li&gt;\\n&lt;li&gt;In some cases the E1810 (100kN) &amp;amp; M1810 (10 ton) screw jacks with 8:1 gear ratio. For advice on an application basis consult Power Jacks Ltd&lt;\\\/li&gt;\\n&lt;li&gt;In some cases the M1815 (15 ton) screw jacks with 8:1 gear ratio. For advice on an application basis consult Power Jacks Ltd&lt;\\\/li&gt;\\n&lt;\\\/ul&gt;\\n&lt;p&gt;All screw jacks with double start lifting screws are considered not to be self-locking. Screw Jacks considered not self-locking will require a brake or other holding device (refer to E-Series Screw Jacks brochure (P69)). If vibration conditions exist, refer to E-Series Screw Jacks brochure (P86). However for detailed advice and analysis consult Power Jacks Ltd&lt;\\\/p&gt;\\n&quot;,&quot;post_title&quot;:&quot;Are Screw Jacks Self-Locking?&quot;,&quot;post_excerpt&quot;:&quot;&quot;,&quot;post_status&quot;:&quot;publish&quot;,&quot;comment_status&quot;:&quot;open&quot;,&quot;ping_status&quot;:&quot;closed&quot;,&quot;post_password&quot;:&quot;&quot;,&quot;post_name&quot;:&quot;2018-08-29-are-screw-jacks-self-locking&quot;,&quot;to_ping&quot;:&quot;&quot;,&quot;pinged&quot;:&quot;&quot;,&quot;post_modified&quot;:&quot;2025-08-15 09:36:33&quot;,&quot;post_modified_gmt&quot;:&quot;2025-08-15 09:36:33&quot;,&quot;post_content_filtered&quot;:&quot;&quot;,&quot;post_parent&quot;:0,&quot;guid&quot;:&quot;https:\\\/\\\/www.laszlo.www.powerjacks.com\\\/faq\\\/2018-08-29-are-screw-jacks-self-locking\\\/&quot;,&quot;menu_order&quot;:10,&quot;post_type&quot;:&quot;faq&quot;,&quot;post_mime_type&quot;:&quot;&quot;,&quot;comment_count&quot;:&quot;0&quot;,&quot;filter&quot;:&quot;raw&quot;}},{&quot;faq&quot;:{&quot;ID&quot;:926,&quot;post_author&quot;:&quot;102&quot;,&quot;post_date&quot;:&quot;2018-08-29 13:56:12&quot;,&quot;post_date_gmt&quot;:&quot;2018-08-29 13:56:12&quot;,&quot;post_content&quot;:&quot;&lt;p&gt;The input torque for a single screw jack depends on the load, the worm gear ratio, type of screw (machine screw, ball screw or roller screw) and the pitch of the lifting screw. Torque values are listed in the individual product specification charts based on capacity loads. For loads from 25% to 100% of screw jack model capacity, torque requirements are approximately proportional to the load.&lt;\\\/p&gt;\\n&quot;,&quot;post_title&quot;:&quot;What is the Lifting Torque Required for a Screw Jack?&quot;,&quot;post_excerpt&quot;:&quot;&quot;,&quot;post_status&quot;:&quot;publish&quot;,&quot;comment_status&quot;:&quot;open&quot;,&quot;ping_status&quot;:&quot;closed&quot;,&quot;post_password&quot;:&quot;&quot;,&quot;post_name&quot;:&quot;2018-08-29-what-is-the-lifting-torque-required-for-a-screw-jack&quot;,&quot;to_ping&quot;:&quot;&quot;,&quot;pinged&quot;:&quot;&quot;,&quot;post_modified&quot;:&quot;2025-08-15 09:37:27&quot;,&quot;post_modified_gmt&quot;:&quot;2025-08-15 09:37:27&quot;,&quot;post_content_filtered&quot;:&quot;&quot;,&quot;post_parent&quot;:0,&quot;guid&quot;:&quot;https:\\\/\\\/www.laszlo.www.powerjacks.com\\\/faq\\\/2018-08-29-what-is-the-lifting-torque-required-for-a-screw-jack\\\/&quot;,&quot;menu_order&quot;:11,&quot;post_type&quot;:&quot;faq&quot;,&quot;post_mime_type&quot;:&quot;&quot;,&quot;comment_count&quot;:&quot;0&quot;,&quot;filter&quot;:&quot;raw&quot;}},{&quot;faq&quot;:{&quot;ID&quot;:930,&quot;post_author&quot;:&quot;102&quot;,&quot;post_date&quot;:&quot;2018-08-29 13:58:12&quot;,&quot;post_date_gmt&quot;:&quot;2018-08-29 13:58:12&quot;,&quot;post_content&quot;:&quot;&lt;p&gt;The input torque, as well as the efficiency and side load ratings, is the same for both translating screw and rotating screw jacks.&lt;\\\/p&gt;\\n&quot;,&quot;post_title&quot;:&quot;Does the Input Torque of a Screw Jack Differ Between Translating and Rotating Screw Models?&quot;,&quot;post_excerpt&quot;:&quot;&quot;,&quot;post_status&quot;:&quot;publish&quot;,&quot;comment_status&quot;:&quot;open&quot;,&quot;ping_status&quot;:&quot;closed&quot;,&quot;post_password&quot;:&quot;&quot;,&quot;post_name&quot;:&quot;2018-08-29-does-the-input-torque-of-a-screw-jack-differ-between-translating-and-rotating-screw-models&quot;,&quot;to_ping&quot;:&quot;&quot;,&quot;pinged&quot;:&quot;&quot;,&quot;post_modified&quot;:&quot;2025-08-15 09:37:04&quot;,&quot;post_modified_gmt&quot;:&quot;2025-08-15 09:37:04&quot;,&quot;post_content_filtered&quot;:&quot;&quot;,&quot;post_parent&quot;:0,&quot;guid&quot;:&quot;https:\\\/\\\/www.laszlo.www.powerjacks.com\\\/faq\\\/2018-08-29-does-the-input-torque-of-a-screw-jack-differ-between-translating-and-rotating-screw-models\\\/&quot;,&quot;menu_order&quot;:12,&quot;post_type&quot;:&quot;faq&quot;,&quot;post_mime_type&quot;:&quot;&quot;,&quot;comment_count&quot;:&quot;0&quot;,&quot;filter&quot;:&quot;raw&quot;}},{&quot;faq&quot;:{&quot;ID&quot;:927,&quot;post_author&quot;:&quot;102&quot;,&quot;post_date&quot;:&quot;2018-08-29 13:56:31&quot;,&quot;post_date_gmt&quot;:&quot;2018-08-29 13:56:31&quot;,&quot;post_content&quot;:&quot;&lt;p&gt;The input power to the screw jacks should not exceed the power rating shown in the specifications table. Maximum input speed in rpm (revolutions per minute) to a screw jacks worm shaft should not exceed 1800 rpm for E-Series and M-Series screw jacks, however the high performance S-Series screw jacks can operate at up to 3000 rpm. Power Jacks cannot accept responsibility for the overheating and rapid wear that may occur should these limits be exceeded. Power increases in direct proportion to the speed, and the motor size will be out of proportion to the screw jack model design rating should the speed become excessively high. When selecting the maximum permissible speed for a screw jack arrangement, always check to see that the power rating of the screw jack model is not exceeded.&lt;\\\/p&gt;\\n&quot;,&quot;post_title&quot;:&quot;What is The Maximum Input Power &amp;amp; Speed for a Screw Jack?&quot;,&quot;post_excerpt&quot;:&quot;&quot;,&quot;post_status&quot;:&quot;publish&quot;,&quot;comment_status&quot;:&quot;open&quot;,&quot;ping_status&quot;:&quot;closed&quot;,&quot;post_password&quot;:&quot;&quot;,&quot;post_name&quot;:&quot;2018-08-29-what-is-the-maximum-input-power-speed-for-a-screw-jack&quot;,&quot;to_ping&quot;:&quot;&quot;,&quot;pinged&quot;:&quot;&quot;,&quot;post_modified&quot;:&quot;2025-08-15 09:37:21&quot;,&quot;post_modified_gmt&quot;:&quot;2025-08-15 09:37:21&quot;,&quot;post_content_filtered&quot;:&quot;&quot;,&quot;post_parent&quot;:0,&quot;guid&quot;:&quot;https:\\\/\\\/www.laszlo.www.powerjacks.com\\\/faq\\\/2018-08-29-what-is-the-maximum-input-power-speed-for-a-screw-jack\\\/&quot;,&quot;menu_order&quot;:13,&quot;post_type&quot;:&quot;faq&quot;,&quot;post_mime_type&quot;:&quot;&quot;,&quot;comment_count&quot;:&quot;0&quot;,&quot;filter&quot;:&quot;raw&quot;}},{&quot;faq&quot;:{&quot;ID&quot;:928,&quot;post_author&quot;:&quot;102&quot;,&quot;post_date&quot;:&quot;2018-08-29 13:56:45&quot;,&quot;post_date_gmt&quot;:&quot;2018-08-29 13:56:45&quot;,&quot;post_content&quot;:&quot;&lt;p&gt;Screw Jack model efficiencies are listed in the individual product specification charts.&lt;\\\/p&gt;\\n&quot;,&quot;post_title&quot;:&quot;What is the Efficiency of a Screw Jack?&quot;,&quot;post_excerpt&quot;:&quot;&quot;,&quot;post_status&quot;:&quot;publish&quot;,&quot;comment_status&quot;:&quot;open&quot;,&quot;ping_status&quot;:&quot;closed&quot;,&quot;post_password&quot;:&quot;&quot;,&quot;post_name&quot;:&quot;2018-08-29-what-is-the-efficiency-of-a-screw-jack&quot;,&quot;to_ping&quot;:&quot;&quot;,&quot;pinged&quot;:&quot;&quot;,&quot;post_modified&quot;:&quot;2025-08-15 09:37:14&quot;,&quot;post_modified_gmt&quot;:&quot;2025-08-15 09:37:14&quot;,&quot;post_content_filtered&quot;:&quot;&quot;,&quot;post_parent&quot;:0,&quot;guid&quot;:&quot;https:\\\/\\\/www.laszlo.www.powerjacks.com\\\/faq\\\/2018-08-29-what-is-the-efficiency-of-a-screw-jack\\\/&quot;,&quot;menu_order&quot;:14,&quot;post_type&quot;:&quot;faq&quot;,&quot;post_mime_type&quot;:&quot;&quot;,&quot;comment_count&quot;:&quot;0&quot;,&quot;filter&quot;:&quot;raw&quot;}},{&quot;faq&quot;:{&quot;ID&quot;:929,&quot;post_author&quot;:&quot;102&quot;,&quot;post_date&quot;:&quot;2018-08-29 13:56:57&quot;,&quot;post_date_gmt&quot;:&quot;2018-08-29 13:56:57&quot;,&quot;post_content&quot;:&quot;&lt;p&gt;The life expectancy of a screw jacks lead screw, bearings, nut and worm gear set varies considerably due to the extent of lubrication, abrasive or chemical action, overloading, excessive heat, improper maintenance, etc. For detailed life calculations consult Power Jacks Ltd.&lt;\\\/p&gt;\\n&quot;,&quot;post_title&quot;:&quot;What is the Expected Life of a Screw Jack?&quot;,&quot;post_excerpt&quot;:&quot;&quot;,&quot;post_status&quot;:&quot;publish&quot;,&quot;comment_status&quot;:&quot;open&quot;,&quot;ping_status&quot;:&quot;closed&quot;,&quot;post_password&quot;:&quot;&quot;,&quot;post_name&quot;:&quot;2018-08-29-what-is-the-expected-life-of-a-screw-jack&quot;,&quot;to_ping&quot;:&quot;&quot;,&quot;pinged&quot;:&quot;&quot;,&quot;post_modified&quot;:&quot;2025-08-15 09:37:09&quot;,&quot;post_modified_gmt&quot;:&quot;2025-08-15 09:37:09&quot;,&quot;post_content_filtered&quot;:&quot;&quot;,&quot;post_parent&quot;:0,&quot;guid&quot;:&quot;https:\\\/\\\/www.laszlo.www.powerjacks.com\\\/faq\\\/2018-08-29-what-is-the-expected-life-of-a-screw-jack\\\/&quot;,&quot;menu_order&quot;:15,&quot;post_type&quot;:&quot;faq&quot;,&quot;post_mime_type&quot;:&quot;&quot;,&quot;comment_count&quot;:&quot;0&quot;,&quot;filter&quot;:&quot;raw&quot;}},{&quot;faq&quot;:{&quot;ID&quot;:933,&quot;post_author&quot;:&quot;102&quot;,&quot;post_date&quot;:&quot;2018-08-29 13:59:35&quot;,&quot;post_date_gmt&quot;:&quot;2018-08-29 13:59:35&quot;,&quot;post_content&quot;:&quot;&lt;p&gt;We recommend the following methods for preventing the rotation of the lifting screw on standard screw jacks. For multiple screw jack systems, fix the lead screw end fittings (e.g. top plate or clevis) to the common member being lifted by all the units. For single screw jack applications, bolt the lead screw end fitting (e.g. top plate or clevis) to the load and ensure the load is guided to prevent rotation.&lt;\\\/p&gt;\\n&lt;p&gt;A guided load is always recommended to ensure that the screw jack does not receive any side load and so guidance can be scaled suitably for the load without altering the screw jack design unnecessarily. It should also be noted that an external guidance system can provide a higher restraining \\u201ckey\\u201d torque than compared to an anti-rotation mechanism in a screw jack.&lt;\\\/p&gt;\\n&quot;,&quot;post_title&quot;:&quot;For Standard Screw Jacks How Do I Prevent The Load from Rotating?&quot;,&quot;post_excerpt&quot;:&quot;&quot;,&quot;post_status&quot;:&quot;publish&quot;,&quot;comment_status&quot;:&quot;open&quot;,&quot;ping_status&quot;:&quot;closed&quot;,&quot;post_password&quot;:&quot;&quot;,&quot;post_name&quot;:&quot;2018-08-29-for-standard-screw-jacks-how-do-i-prevent-the-load-from-rotating&quot;,&quot;to_ping&quot;:&quot;&quot;,&quot;pinged&quot;:&quot;&quot;,&quot;post_modified&quot;:&quot;2025-08-15 09:36:42&quot;,&quot;post_modified_gmt&quot;:&quot;2025-08-15 09:36:42&quot;,&quot;post_content_filtered&quot;:&quot;&quot;,&quot;post_parent&quot;:0,&quot;guid&quot;:&quot;https:\\\/\\\/www.laszlo.www.powerjacks.com\\\/faq\\\/2018-08-29-for-standard-screw-jacks-how-do-i-prevent-the-load-from-rotating\\\/&quot;,&quot;menu_order&quot;:16,&quot;post_type&quot;:&quot;faq&quot;,&quot;post_mime_type&quot;:&quot;&quot;,&quot;comment_count&quot;:&quot;0&quot;,&quot;filter&quot;:&quot;raw&quot;}},{&quot;faq&quot;:{&quot;ID&quot;:944,&quot;post_author&quot;:&quot;102&quot;,&quot;post_date&quot;:&quot;2018-09-06 13:52:47&quot;,&quot;post_date_gmt&quot;:&quot;2018-09-06 13:52:47&quot;,&quot;post_content&quot;:&quot;&lt;!-- wp:image {\\&quot;id\\&quot;:11433,\\&quot;sizeSlug\\&quot;:\\&quot;full\\&quot;,\\&quot;linkDestination\\&quot;:\\&quot;none\\&quot;} --&gt;\\n&lt;figure class=\\&quot;wp-block-image size-full\\&quot;&gt;&lt;img src=\\&quot;https:\\\/\\\/www.powerjacks.com\\\/wp-content\\\/uploads\\\/2018\\\/09\\\/columnstrengthchartexample-powerjacks-320x240-w320h240.jpg\\&quot; alt=\\&quot;\\&quot; class=\\&quot;wp-image-11433\\&quot;\\\/&gt;&lt;\\\/figure&gt;\\n&lt;!-- \\\/wp:image --&gt;\\n\\n&lt;p&gt;For Compression Loads: The column strength of a screw is determined by the relationship between the length of the screw and its diameter. Column strength nomographs are included in the Screw Jacks catalogue for each screw jack size.&lt;\\\/p&gt;&quot;,&quot;post_title&quot;:&quot;What is the Column Strength of the Screw Jack?&quot;,&quot;post_excerpt&quot;:&quot;&quot;,&quot;post_status&quot;:&quot;publish&quot;,&quot;comment_status&quot;:&quot;open&quot;,&quot;ping_status&quot;:&quot;closed&quot;,&quot;post_password&quot;:&quot;&quot;,&quot;post_name&quot;:&quot;2018-09-06-what-is-the-column-strength-of-the-screw-jack&quot;,&quot;to_ping&quot;:&quot;&quot;,&quot;pinged&quot;:&quot;&quot;,&quot;post_modified&quot;:&quot;2025-11-21 15:04:09&quot;,&quot;post_modified_gmt&quot;:&quot;2025-11-21 15:04:09&quot;,&quot;post_content_filtered&quot;:&quot;&quot;,&quot;post_parent&quot;:0,&quot;guid&quot;:&quot;https:\\\/\\\/www.laszlo.www.powerjacks.com\\\/faq\\\/2018-09-06-what-is-the-column-strength-of-the-screw-jack\\\/&quot;,&quot;menu_order&quot;:17,&quot;post_type&quot;:&quot;faq&quot;,&quot;post_mime_type&quot;:&quot;&quot;,&quot;comment_count&quot;:&quot;0&quot;,&quot;filter&quot;:&quot;raw&quot;}},{&quot;faq&quot;:{&quot;ID&quot;:935,&quot;post_author&quot;:&quot;102&quot;,&quot;post_date&quot;:&quot;2018-08-29 14:05:07&quot;,&quot;post_date_gmt&quot;:&quot;2018-08-29 14:05:07&quot;,&quot;post_content&quot;:&quot;&lt;p&gt;Shock loads should be eliminated or reduced to a minimum, if they cannot be avoided, the screw jack model selected should be rated at twice the required static load.&lt;\\\/p&gt;\\n&lt;p&gt;For severe shock load applications, using the E-Series, S-Series, and M-series screw jacks, the load bearings should be replaced with heat-treated steel thrust rings which is an option available from Power Jacks. Note this will increase the input torque by approximately 100 percent.&lt;\\\/p&gt;\\n&quot;,&quot;post_title&quot;:&quot;Are Shock Loads Permissible on a Screw Jack?&quot;,&quot;post_excerpt&quot;:&quot;&quot;,&quot;post_status&quot;:&quot;publish&quot;,&quot;comment_status&quot;:&quot;open&quot;,&quot;ping_status&quot;:&quot;closed&quot;,&quot;post_password&quot;:&quot;&quot;,&quot;post_name&quot;:&quot;2018-08-29-are-shock-loads-permissible-on-a-screw-jack&quot;,&quot;to_ping&quot;:&quot;&quot;,&quot;pinged&quot;:&quot;&quot;,&quot;post_modified&quot;:&quot;2025-08-15 09:36:16&quot;,&quot;post_modified_gmt&quot;:&quot;2025-08-15 09:36:16&quot;,&quot;post_content_filtered&quot;:&quot;&quot;,&quot;post_parent&quot;:0,&quot;guid&quot;:&quot;https:\\\/\\\/www.laszlo.www.powerjacks.com\\\/faq\\\/2018-08-29-are-shock-loads-permissible-on-a-screw-jack\\\/&quot;,&quot;menu_order&quot;:18,&quot;post_type&quot;:&quot;faq&quot;,&quot;post_mime_type&quot;:&quot;&quot;,&quot;comment_count&quot;:&quot;0&quot;,&quot;filter&quot;:&quot;raw&quot;}},{&quot;faq&quot;:{&quot;ID&quot;:964,&quot;post_author&quot;:&quot;102&quot;,&quot;post_date&quot;:&quot;2018-08-29 14:08:45&quot;,&quot;post_date_gmt&quot;:&quot;2018-08-29 14:08:45&quot;,&quot;post_content&quot;:&quot;&lt;p&gt;Screw Jacks will operate in areas with vibration, however the vibration may cause the lifting screw to creep or inch down under load. For applications involving slight vibration, select the higher of the worm gear ratios. Should considerable vibration be present, use a drive motor equipped with a magnetic brake, which will prevent the screw jack from self-lowering\\\/back-driving.&lt;\\\/p&gt;\\n&quot;,&quot;post_title&quot;:&quot;Can Screw Jacks Operate where Vibration is Present?&quot;,&quot;post_excerpt&quot;:&quot;&quot;,&quot;post_status&quot;:&quot;publish&quot;,&quot;comment_status&quot;:&quot;open&quot;,&quot;ping_status&quot;:&quot;closed&quot;,&quot;post_password&quot;:&quot;&quot;,&quot;post_name&quot;:&quot;2018-08-29-can-screw-jacks-operate-where-vibration-is-present&quot;,&quot;to_ping&quot;:&quot;&quot;,&quot;pinged&quot;:&quot;&quot;,&quot;post_modified&quot;:&quot;2025-08-15 09:34:39&quot;,&quot;post_modified_gmt&quot;:&quot;2025-08-15 09:34:39&quot;,&quot;post_content_filtered&quot;:&quot;&quot;,&quot;post_parent&quot;:0,&quot;guid&quot;:&quot;https:\\\/\\\/www.laszlo.www.powerjacks.com\\\/faq\\\/2018-08-29-can-screw-jacks-operate-where-vibration-is-present\\\/&quot;,&quot;menu_order&quot;:19,&quot;post_type&quot;:&quot;faq&quot;,&quot;post_mime_type&quot;:&quot;&quot;,&quot;comment_count&quot;:&quot;0&quot;,&quot;filter&quot;:&quot;raw&quot;}}],&quot;pagination&quot;:{&quot;current_page&quot;:1,&quot;per_page&quot;:20,&quot;total_pages&quot;:5,&quot;results&quot;:82},&quot;options&quot;:{&quot;post_type&quot;:&quot;faq&quot;,&quot;post_status&quot;:&quot;publish&quot;,&quot;paged&quot;:1,&quot;orderby&quot;:&quot;term_order&quot;,&quot;posts_per_page&quot;:20},&quot;filter&quot;:{&quot;categories&quot;:[{&quot;term_id&quot;:83,&quot;name&quot;:&quot;Screw Jacks&quot;,&quot;slug&quot;:&quot;screw-jacks&quot;,&quot;term_group&quot;:0,&quot;term_taxonomy_id&quot;:119,&quot;taxonomy&quot;:&quot;faq-category&quot;,&quot;description&quot;:&quot;&quot;,&quot;parent&quot;:0,&quot;count&quot;:38,&quot;filter&quot;:&quot;raw&quot;,&quot;term_order&quot;:&quot;1&quot;,&quot;cat_ID&quot;:83,&quot;category_count&quot;:38,&quot;category_description&quot;:&quot;&quot;,&quot;cat_name&quot;:&quot;Screw Jacks&quot;,&quot;category_nicename&quot;:&quot;screw-jacks&quot;,&quot;category_parent&quot;:0},{&quot;term_id&quot;:86,&quot;name&quot;:&quot;Electric Linear Actuators&quot;,&quot;slug&quot;:&quot;electric-linear-actuators&quot;,&quot;term_group&quot;:0,&quot;term_taxonomy_id&quot;:122,&quot;taxonomy&quot;:&quot;faq-category&quot;,&quot;description&quot;:&quot;&quot;,&quot;parent&quot;:0,&quot;count&quot;:20,&quot;filter&quot;:&quot;raw&quot;,&quot;term_order&quot;:&quot;2&quot;,&quot;cat_ID&quot;:86,&quot;category_count&quot;:20,&quot;category_description&quot;:&quot;&quot;,&quot;cat_name&quot;:&quot;Electric Linear Actuators&quot;,&quot;category_nicename&quot;:&quot;electric-linear-actuators&quot;,&quot;category_parent&quot;:0},{&quot;term_id&quot;:84,&quot;name&quot;:&quot;Bevel Gearboxes&quot;,&quot;slug&quot;:&quot;bevel-gearboxes&quot;,&quot;term_group&quot;:0,&quot;term_taxonomy_id&quot;:120,&quot;taxonomy&quot;:&quot;faq-category&quot;,&quot;description&quot;:&quot;&quot;,&quot;parent&quot;:0,&quot;count&quot;:15,&quot;filter&quot;:&quot;raw&quot;,&quot;term_order&quot;:&quot;3&quot;,&quot;cat_ID&quot;:84,&quot;category_count&quot;:15,&quot;category_description&quot;:&quot;&quot;,&quot;cat_name&quot;:&quot;Bevel Gearboxes&quot;,&quot;category_nicename&quot;:&quot;bevel-gearboxes&quot;,&quot;category_parent&quot;:0},{&quot;term_id&quot;:85,&quot;name&quot;:&quot;Customers&quot;,&quot;slug&quot;:&quot;customers&quot;,&quot;term_group&quot;:0,&quot;term_taxonomy_id&quot;:121,&quot;taxonomy&quot;:&quot;faq-category&quot;,&quot;description&quot;:&quot;&quot;,&quot;parent&quot;:0,&quot;count&quot;:9,&quot;filter&quot;:&quot;raw&quot;,&quot;term_order&quot;:&quot;4&quot;,&quot;cat_ID&quot;:85,&quot;category_count&quot;:9,&quot;category_description&quot;:&quot;&quot;,&quot;cat_name&quot;:&quot;Customers&quot;,&quot;category_nicename&quot;:&quot;customers&quot;,&quot;category_parent&quot;:0}]}}'\r\n            :faq-filter-page=\"1\"\r\n            :posts-per-page=\"20\"\r\n                    ><\/faq-filter>\r\n        \n    <section class=\"productDownloads\" id=\"downloads\">\n        <div class=\"wrapper wrapper--small\">\n            <div class=\"wrapperTop\">\n                <div class=\"productDownloads__intro\">\n                    <h2 class=\"productDownloads__title\">Downloads<\/h2>\n                    <p>For the complete range of brochures, datasheets, videos and more go to the Downloads page.<\/p>\n                <\/div>\n\n                                <a href=\"https:\/\/www.powerjacks.com\/downloads\/\" class=\"buttonLarge buttonAlt\" aria-label=\"Downloads\">\n                    Downloads                <\/a>\n            <\/div>\n\n            <div class=\"swiper productDownloads__slider\">\n                <div class=\"swiper-wrapper\">\n                    \n                        <div class=\"swiper-slide productDownloads__item document-card\">\n                            <div class=\"document-card__top\">\n                                <div class=\"document-imageBox  \"\n                                                                    >\n                                    <img decoding=\"async\" width=\"334\" height=\"473\" 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\u7cfb\u5217\u6d77\u5e95\u87ba\u65cb\u5347\u964d\u673a\uff08EN\uff09<\/h4>\n                        <\/div>\n                    \n                        <div class=\"swiper-slide productDownloads__item document-card\">\n                            <div class=\"document-card__top\">\n                                <div class=\"document-imageBox  \"\n                                                                    >\n                                    <img decoding=\"async\" width=\"334\" height=\"473\" src=\"https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/11\/PowerJacks-Screw-Jack-Design-Guide-PJDG-SJ-EN-05-P1.jpg.webp\" class=\"document-image\" alt=\"Screw Jack Design Guide, Cover\" srcset=\"https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/11\/PowerJacks-Screw-Jack-Design-Guide-PJDG-SJ-EN-05-P1.jpg.webp 794w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/11\/PowerJacks-Screw-Jack-Design-Guide-PJDG-SJ-EN-05-P1-212x300.jpg.webp 212w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/11\/PowerJacks-Screw-Jack-Design-Guide-PJDG-SJ-EN-05-P1-724x1024.jpg.webp 724w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/11\/PowerJacks-Screw-Jack-Design-Guide-PJDG-SJ-EN-05-P1-768x1086.jpg.webp 768w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/11\/PowerJacks-Screw-Jack-Design-Guide-PJDG-SJ-EN-05-P1-54x76.jpg.webp 54w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/11\/PowerJacks-Screw-Jack-Design-Guide-PJDG-SJ-EN-05-P1-124x175.jpg.webp 124w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/11\/PowerJacks-Screw-Jack-Design-Guide-PJDG-SJ-EN-05-P1-115x162.jpg.webp 115w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/11\/PowerJacks-Screw-Jack-Design-Guide-PJDG-SJ-EN-05-P1-57x80.jpg.webp 57w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/11\/PowerJacks-Screw-Jack-Design-Guide-PJDG-SJ-EN-05-P1-548x775.jpg.webp 548w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/11\/PowerJacks-Screw-Jack-Design-Guide-PJDG-SJ-EN-05-P1-46x65.jpg.webp 46w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/11\/PowerJacks-Screw-Jack-Design-Guide-PJDG-SJ-EN-05-P1-600x849.jpg.webp 600w\" sizes=\"(max-width: 334px) 100vw, 334px\" \/>\n<!--                                    --><!--                                        <span class=\"document-type\">--><!--<\/span>-->\n<!--                                    -->                                <\/div>\n\n                                <div class=\"document-card__moveUp\">\n                                    <div><!-- wp:paragraph {\"translatedWithWPMLTM\":\"1\"} -->\n<p>\u65b0 &#8211; 312 \u9875\uff0832Mb\uff09\u300a\u87ba\u65cb\u5347\u964d\u673a\u8bbe\u8ba1\u6307\u5357\u300b\uff08\u7b2c 5 \u7248\uff09\uff0c\u5305\u542b\u673a\u5668\u87ba\u65cb\u5347\u964d\u673a\u3001\u4e0d\u9508\u94a2\u87ba\u65cb\u5347\u964d\u673a\u3001\u6eda\u73e0\u87ba\u65cb\u5347\u964d\u673a\u3001\u6eda\u67f1\u87ba\u65cb\u5347\u964d\u673a\u7684\u6027\u80fd\u548c\u5c3a\u5bf8\u8be6\u60c5\uff0c\u4ee5\u53ca\u9876\u5347\u7cfb\u7edf\u7684\u7cfb\u7edf\u7ec4\u4ef6\uff0c\u5305\u62ec\u9525\u9f7f\u8f6e\u7bb1\u3001\u8054\u8f74\u5668\u3001\u4f20\u52a8\u8f74\u3001\u7535\u673a\u3001\u51cf\u901f\u7bb1\u3001\u9650\u4f4d\u5f00\u5173\u3001\u7f16\u7801\u5668\u7b49\u3002<\/p>\n<!-- \/wp:paragraph --><\/div>\n                                                                            <a href=\"https:\/\/www.powerjacks.com\/wp-content\/uploads\/2025\/11\/powerjacks-screw-jack-design-guide-pjdg-sj-en-05.pdf\"\n                                           target=\"_blank\"\n                                           class=\"actionButton download-btn buttonAlt\"\n                                           aria-label=\"Download PDF\"\n                                           download\n                                        >\n                                            Download PDF                                        <\/a>\n                                                                    <\/div>\n                            <\/div>\n\n                            <h4 class=\"document-title\">\u87ba\u65cb\u5347\u964d\u673a\u8bbe\u8ba1\u6307\u5357\uff08\u82f1\u6587\uff09<\/h4>\n                        <\/div>\n                    \n                        <div class=\"swiper-slide productDownloads__item document-card\">\n                            <div class=\"document-card__top\">\n                                <div class=\"document-imageBox  \"\n                                                                    >\n                                    <img decoding=\"async\" width=\"334\" height=\"473\" src=\"https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/11\/PowerJacks-POWERAM_Actuator-PJ-LAB-L-EN-00-P1.jpg.webp\" class=\"document-image\" alt=\"POWERAM Electric Linear Actuators, Brochure, Cover\" srcset=\"https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/11\/PowerJacks-POWERAM_Actuator-PJ-LAB-L-EN-00-P1.jpg.webp 794w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/11\/PowerJacks-POWERAM_Actuator-PJ-LAB-L-EN-00-P1-212x300.jpg.webp 212w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/11\/PowerJacks-POWERAM_Actuator-PJ-LAB-L-EN-00-P1-724x1024.jpg.webp 724w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/11\/PowerJacks-POWERAM_Actuator-PJ-LAB-L-EN-00-P1-768x1086.jpg.webp 768w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/11\/PowerJacks-POWERAM_Actuator-PJ-LAB-L-EN-00-P1-54x76.jpg.webp 54w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/11\/PowerJacks-POWERAM_Actuator-PJ-LAB-L-EN-00-P1-124x175.jpg.webp 124w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/11\/PowerJacks-POWERAM_Actuator-PJ-LAB-L-EN-00-P1-115x162.jpg.webp 115w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/11\/PowerJacks-POWERAM_Actuator-PJ-LAB-L-EN-00-P1-57x80.jpg.webp 57w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/11\/PowerJacks-POWERAM_Actuator-PJ-LAB-L-EN-00-P1-548x775.jpg.webp 548w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/11\/PowerJacks-POWERAM_Actuator-PJ-LAB-L-EN-00-P1-46x65.jpg.webp 46w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/11\/PowerJacks-POWERAM_Actuator-PJ-LAB-L-EN-00-P1-600x849.jpg.webp 600w\" sizes=\"(max-width: 334px) 100vw, 334px\" \/>\n<!--                                    --><!--                                        <span class=\"document-type\">--><!--<\/span>-->\n<!--                                    -->                                <\/div>\n\n                                <div class=\"document-card__moveUp\">\n                                    <div><!-- wp:paragraph {\"translatedWithWPMLTM\":\"1\"} -->\n<p>POWERAM \u76f4\u7ebf\u6267\u884c\u5668\u4ea7\u54c1\u76ee\u5f55\uff0c\u5305\u62ec\u8717\u8f6e\u87ba\u6746\u3001\u4e0d\u9508\u94a2\u548c\u6eda\u73e0\u87ba\u6746\u578b\u53f7\uff0c\u6807\u51c6\u8f7d\u8377\u4ece 10kN \u5230 200kN\u3002<\/p>\n<!-- \/wp:paragraph --><\/div>\n                                                                            <a href=\"https:\/\/www.powerjacks.com\/wp-content\/uploads\/2025\/11\/powerjacks-poweram-actuator-pj-lab-l-en-00.pdf\"\n                                           target=\"_blank\"\n                                           class=\"actionButton download-btn buttonAlt\"\n                                           aria-label=\"Download PDF\"\n                                           download\n                                        >\n                                            Download PDF                                        <\/a>\n                                                                    <\/div>\n                            <\/div>\n\n                            <h4 class=\"document-title\">POWERAM \u7535\u52a8\u76f4\u7ebf\u6267\u884c\u5668\uff08EN\uff09<\/h4>\n                        <\/div>\n                    \n                        <div class=\"swiper-slide productDownloads__item document-card\">\n                            <div class=\"document-card__top\">\n                                <div class=\"document-imageBox  \"\n                                                                    >\n                                    <img decoding=\"async\" width=\"334\" height=\"473\" src=\"https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/11\/PowerJacks-Linear-Actuator-PJLAB-ROLARAM-EN-02-P1.jpg.webp\" class=\"document-image\" alt=\"Rolaram Electric Linear Actuators, Brochure, Cover\" srcset=\"https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/11\/PowerJacks-Linear-Actuator-PJLAB-ROLARAM-EN-02-P1.jpg.webp 794w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/11\/PowerJacks-Linear-Actuator-PJLAB-ROLARAM-EN-02-P1-212x300.jpg.webp 212w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/11\/PowerJacks-Linear-Actuator-PJLAB-ROLARAM-EN-02-P1-724x1024.jpg.webp 724w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/11\/PowerJacks-Linear-Actuator-PJLAB-ROLARAM-EN-02-P1-768x1086.jpg.webp 768w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/11\/PowerJacks-Linear-Actuator-PJLAB-ROLARAM-EN-02-P1-54x76.jpg.webp 54w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/11\/PowerJacks-Linear-Actuator-PJLAB-ROLARAM-EN-02-P1-124x175.jpg.webp 124w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/11\/PowerJacks-Linear-Actuator-PJLAB-ROLARAM-EN-02-P1-115x162.jpg.webp 115w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/11\/PowerJacks-Linear-Actuator-PJLAB-ROLARAM-EN-02-P1-57x80.jpg.webp 57w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/11\/PowerJacks-Linear-Actuator-PJLAB-ROLARAM-EN-02-P1-548x775.jpg.webp 548w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/11\/PowerJacks-Linear-Actuator-PJLAB-ROLARAM-EN-02-P1-46x65.jpg.webp 46w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/11\/PowerJacks-Linear-Actuator-PJLAB-ROLARAM-EN-02-P1-600x849.jpg.webp 600w\" sizes=\"(max-width: 334px) 100vw, 334px\" \/>\n<!--                                    --><!--                                        <span class=\"document-type\">--><!--<\/span>-->\n<!--                                    -->                                <\/div>\n\n                                <div class=\"document-card__moveUp\">\n                                    <div><!-- wp:paragraph {\"translatedWithWPMLTM\":\"1\"} -->\n<p>\u5e26\u6709\u884c\u661f\u6eda\u67f1\u87ba\u6746\u6216\u6eda\u73e0\u87ba\u6746\u9a71\u52a8\u88c5\u7f6e\u7684 Rolaram \u76f4\u7ebf\u6267\u884c\u5668\u76ee\u5f55\uff0c\u9002\u7528\u4e8e\u52a8\u8f7d\u9ad8\u8fbe 400kN (40Te) \u7684\u9ad8\u6027\u80fd\u4e2d\u9ad8\u8d1f\u8377\u5e94\u7528\u3002<\/p>\n<!-- \/wp:paragraph --><\/div>\n                                                                            <a href=\"https:\/\/www.powerjacks.com\/wp-content\/uploads\/2025\/11\/powerjacks-linear-actuator-pjlab-rolaram-en-02.pdf\"\n                                           target=\"_blank\"\n                                           class=\"actionButton download-btn buttonAlt\"\n                                           aria-label=\"Download PDF\"\n                                           download\n                                        >\n                                            Download PDF                                        <\/a>\n                                                                    <\/div>\n                            <\/div>\n\n                            <h4 class=\"document-title\">\u7f57\u62c9\u62c9\u59c6\u76f4\u7ebf\u6267\u884c\u5668\uff08EN\uff09<\/h4>\n                        <\/div>\n                    \n                        <div class=\"swiper-slide productDownloads__item document-card\">\n                            <div class=\"document-card__top\">\n                                <div class=\"document-imageBox  \"\n                                                                    >\n                                    <img decoding=\"async\" width=\"332\" height=\"473\" src=\"https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/08\/Screenshot-2025-08-20-at-12.52.04.png.webp\" class=\"document-image\" alt=\"\" srcset=\"https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/08\/Screenshot-2025-08-20-at-12.52.04.png.webp 776w, https:\/\/www.powerjacks.com\/wp-content\/uploads\/2025\/08\/Screenshot-2025-08-20-at-12.52.04-211x300.png 211w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/08\/Screenshot-2025-08-20-at-12.52.04-720x1024.png.webp 720w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/08\/Screenshot-2025-08-20-at-12.52.04-768x1093.png.webp 768w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/08\/Screenshot-2025-08-20-at-12.52.04-54x77.png.webp 54w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/08\/Screenshot-2025-08-20-at-12.52.04-123x175.png.webp 123w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/08\/Screenshot-2025-08-20-at-12.52.04-114x162.png.webp 114w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/08\/Screenshot-2025-08-20-at-12.52.04-56x80.png.webp 56w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/08\/Screenshot-2025-08-20-at-12.52.04-548x780.png.webp 548w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/08\/Screenshot-2025-08-20-at-12.52.04-46x65.png.webp 46w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/08\/Screenshot-2025-08-20-at-12.52.04-600x854.png.webp 600w\" sizes=\"(max-width: 332px) 100vw, 332px\" \/>\n<!--                                    --><!--                                        <span class=\"document-type\">--><!--<\/span>-->\n<!--                                    -->                                <\/div>\n\n                                <div class=\"document-card__moveUp\">\n                                    <div><!-- wp:paragraph -->\n<p>Maintenance manual for E-Series metric machine screw jacks &#8211; single face gearbox design.<\/p>\n<!-- \/wp:paragraph --><\/div>\n                                                                            <a href=\"https:\/\/www.powerjacks.com\/wp-content\/uploads\/2025\/08\/powerjacks-e-series-machine-screw-jack-manual-mm-sj-ems-en-02a.pdf\"\n                                           target=\"_blank\"\n                                           class=\"actionButton download-btn buttonAlt\"\n                                           aria-label=\"Download PDF\"\n                                           download\n                                        >\n                                            Download PDF                                        <\/a>\n                                                                    <\/div>\n                            <\/div>\n\n                            <h4 class=\"document-title\">E-Series Machine Screw Jack Manual(EN)<\/h4>\n                        <\/div>\n                    \n                        <div class=\"swiper-slide productDownloads__item document-card\">\n                            <div class=\"document-card__top\">\n                                <div class=\"document-imageBox  \"\n                                                                    >\n                                    <img decoding=\"async\" width=\"324\" height=\"473\" src=\"https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/08\/PowerJacks-Bevel_Gearbox-Manual-MM-SBG-N-EN-04_Page_01.jpg.webp\" class=\"document-image\" alt=\"\" srcset=\"https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/08\/PowerJacks-Bevel_Gearbox-Manual-MM-SBG-N-EN-04_Page_01.jpg.webp 794w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/08\/PowerJacks-Bevel_Gearbox-Manual-MM-SBG-N-EN-04_Page_01-206x300.jpg.webp 206w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/08\/PowerJacks-Bevel_Gearbox-Manual-MM-SBG-N-EN-04_Page_01-702x1024.jpg.webp 702w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/08\/PowerJacks-Bevel_Gearbox-Manual-MM-SBG-N-EN-04_Page_01-768x1120.jpg.webp 768w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/08\/PowerJacks-Bevel_Gearbox-Manual-MM-SBG-N-EN-04_Page_01-54x79.jpg.webp 54w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/08\/PowerJacks-Bevel_Gearbox-Manual-MM-SBG-N-EN-04_Page_01-120x175.jpg.webp 120w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/08\/PowerJacks-Bevel_Gearbox-Manual-MM-SBG-N-EN-04_Page_01-111x162.jpg.webp 111w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/08\/PowerJacks-Bevel_Gearbox-Manual-MM-SBG-N-EN-04_Page_01-55x80.jpg.webp 55w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/08\/PowerJacks-Bevel_Gearbox-Manual-MM-SBG-N-EN-04_Page_01-548x799.jpg.webp 548w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/08\/PowerJacks-Bevel_Gearbox-Manual-MM-SBG-N-EN-04_Page_01-45x65.jpg.webp 45w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/08\/PowerJacks-Bevel_Gearbox-Manual-MM-SBG-N-EN-04_Page_01-600x875.jpg.webp 600w\" sizes=\"(max-width: 324px) 100vw, 324px\" \/>\n<!--                                    --><!--                                        <span class=\"document-type\">--><!--<\/span>-->\n<!--                                    -->                                <\/div>\n\n                                <div class=\"document-card__moveUp\">\n                                    <div><!-- wp:paragraph -->\n<p>Maintenance manual for Neeter Drive Range-N spiral bevel gearboxes.<\/p>\n<!-- \/wp:paragraph --><\/div>\n                                                                            <a href=\"https:\/\/www.powerjacks.com\/wp-content\/uploads\/2025\/08\/powerjacks-bevelgearbox-manual-mm-sbg-n-en-04.pdf\"\n                                           target=\"_blank\"\n                                           class=\"actionButton download-btn buttonAlt\"\n                                           aria-label=\"Download PDF\"\n                                           download\n                                        >\n                                            Download PDF                                        <\/a>\n                                                                    <\/div>\n                            <\/div>\n\n                            <h4 class=\"document-title\">Range-N Bevel Gearbox Manual(EN)<\/h4>\n                        <\/div>\n                    \n                        <div class=\"swiper-slide productDownloads__item document-card\">\n                            <div class=\"document-card__top\">\n                                <div class=\"document-imageBox  \"\n                                                                    >\n                                    <img decoding=\"async\" width=\"332\" height=\"473\" src=\"https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/08\/Screenshot-2025-08-20-at-13.00.40.png.webp\" class=\"document-image\" alt=\"\" srcset=\"https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/08\/Screenshot-2025-08-20-at-13.00.40.png.webp 770w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/08\/Screenshot-2025-08-20-at-13.00.40-211x300.png.webp 211w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/08\/Screenshot-2025-08-20-at-13.00.40-719x1024.png.webp 719w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/08\/Screenshot-2025-08-20-at-13.00.40-768x1093.png.webp 768w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/08\/Screenshot-2025-08-20-at-13.00.40-54x77.png.webp 54w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/08\/Screenshot-2025-08-20-at-13.00.40-123x175.png.webp 123w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/08\/Screenshot-2025-08-20-at-13.00.40-114x162.png.webp 114w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/08\/Screenshot-2025-08-20-at-13.00.40-56x80.png.webp 56w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/08\/Screenshot-2025-08-20-at-13.00.40-548x780.png.webp 548w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/08\/Screenshot-2025-08-20-at-13.00.40-46x65.png.webp 46w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/08\/Screenshot-2025-08-20-at-13.00.40-600x854.png.webp 600w\" sizes=\"(max-width: 332px) 100vw, 332px\" \/>\n<!--                                    --><!--                                        <span class=\"document-type\">--><!--<\/span>-->\n<!--                                    -->                                <\/div>\n\n                                <div class=\"document-card__moveUp\">\n                                    <div><!-- wp:paragraph -->\n<p>Maintenance manual for electric linear actuators &#8211; Rolaram Series.<\/p>\n<!-- \/wp:paragraph --><\/div>\n                                                                            <a href=\"https:\/\/www.powerjacks.com\/wp-content\/uploads\/2025\/08\/powerjacks-rolaram-manual-mmlar-en-02.pdf\"\n                                           target=\"_blank\"\n                                           class=\"actionButton download-btn buttonAlt\"\n                                           aria-label=\"Download PDF\"\n                                           download\n                                        >\n                                            Download PDF                                        <\/a>\n                                                                    <\/div>\n                            <\/div>\n\n                            <h4 class=\"document-title\">Rolaram Linear Actuator Manual(EN)<\/h4>\n                        <\/div>\n                    \n                        <div class=\"swiper-slide productDownloads__item document-card\">\n                            <div class=\"document-card__top\">\n                                <div class=\"document-imageBox  \"\n                                                                    >\n                                    <img 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https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/11\/PowerJacks-PJB-PRS-Spiracon-EN-01a-P1-54x76.jpg.webp 54w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/11\/PowerJacks-PJB-PRS-Spiracon-EN-01a-P1-124x175.jpg.webp 124w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/11\/PowerJacks-PJB-PRS-Spiracon-EN-01a-P1-115x162.jpg.webp 115w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/11\/PowerJacks-PJB-PRS-Spiracon-EN-01a-P1-57x80.jpg.webp 57w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/11\/PowerJacks-PJB-PRS-Spiracon-EN-01a-P1-548x775.jpg.webp 548w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/11\/PowerJacks-PJB-PRS-Spiracon-EN-01a-P1-46x65.jpg.webp 46w, https:\/\/www.powerjacks.com\/wp-content\/smush-webp\/2025\/11\/PowerJacks-PJB-PRS-Spiracon-EN-01a-P1-600x848.jpg.webp 600w\" sizes=\"(max-width: 334px) 100vw, 334px\" \/>\n<!--                                    --><!--                                        <span class=\"document-type\">--><!--<\/span>-->\n<!--                                    -->                                <\/div>\n\n                                <div class=\"document-card__moveUp\">\n                                    <div><!-- wp:paragraph -->\n<p>Spiracon Planetary Roller Screw brochure with models up to 1800kN load rating.<\/p>\n<!-- \/wp:paragraph --><\/div>\n                                                                            <a href=\"https:\/\/www.powerjacks.com\/wp-content\/uploads\/2025\/11\/powerjacks-pjb-prs-spiracon-en-01a.pdf\"\n                                           target=\"_blank\"\n                                           class=\"actionButton download-btn buttonAlt\"\n                                           aria-label=\"Download PDF\"\n                                           download\n                                        >\n                                            Download PDF                                        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<\/div>\n        <\/div>\n    <\/section>\n        ","protected":false},"excerpt":{"rendered":"<p>\u67e5\u627e\u6709\u5173\u6211\u4eec\u7cfb\u5217\u4ea7\u54c1\u7684\u4e00\u4e9b\u5e38\u89c1\u95ee\u9898\u7684\u7b54\u6848\u3002\u4ece\u6280\u672f\u89c4\u683c\u5230\u64cd\u4f5c\u95ee\u9898\uff0c\u518d\u5230\u672f\u8bed\u8bf4\u660e\u3002<\/p>\n","protected":false},"author":100,"featured_media":0,"parent":15197,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-15297","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u5e38\u89c1\u95ee\u9898 | Power Jacks Limited<\/title>\n<meta name=\"description\" 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