{"id":7184,"date":"2025-07-08T11:58:04","date_gmt":"2025-07-08T03:58:04","guid":{"rendered":"https:\/\/www.wtauserver.com\/?p=7184"},"modified":"2025-12-02T11:31:10","modified_gmt":"2025-12-02T03:31:10","slug":"wtau-qgx-lift-height-limiter","status":"publish","type":"post","link":"https:\/\/www.wtauserver.com\/en\/wtau-qgx-lift-height-limiter\/","title":{"rendered":"Micro-special QGX lifting height limiter"},"content":{"rendered":"<p><video controls=\"controls\" width=\"481\" height=\"481\"><source src=\"https:\/\/jmy-video.baidu.com\/ea9d16c50681512107e9bdbd9260397d_720_1280.mp4\" type=\"video\/mp4\" \/><\/video><\/p>\n<h3><strong>1. Industry Pain Points<\/strong>\u200b<\/h3>\n<ul>\n<li>\u200b<strong>Risk of loss of control of lifting height<\/strong>When cranes, elevators, lifts and other equipment are performing lifting operations, if the lifting gear (hooks, cabins, platforms, etc.) rises beyond the preset safety limit height, a \"topping-out\" accident is highly likely to occur, causing severe impact damage to the equipment structure (such as the boom, the top of the hoistway), and even leading to disastrous consequences such as wire rope breakage, heavy object falling, derailing and overturning.<\/li>\n<li>\u200b<strong>Personnel safety threat<\/strong>The above-mentioned accident directly endangered the lives and safety of the equipment operators and the people around them.<\/li>\n<li>\u200b<strong>Relying on a single protection is risky:<\/strong>Relying solely on manual observation or primary limit devices is difficult to provide absolutely reliable protection in complex working conditions, especially when operating under fatigue, in harsh environments or during rapid operations, the risks increase sharply.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h2>\u200b<strong>2. Solution<\/strong>\u200b<\/h2>\n<p>The QGX lifting height limiter is a key safety protection device specially designed to effectively prevent accidents such as lifting equipment hitting the top. The core solution lies in:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-7185 aligncenter\" src=\"https:\/\/www.wtauserver.com\/wp-content\/uploads\/2025\/07\/96cccfca152fb8929fd9c8e7b218da16.webp\" alt=\"QGX type lifting height limiter \" width=\"800\" height=\"467\" srcset=\"https:\/\/www.wtauserver.com\/wp-content\/uploads\/2025\/07\/96cccfca152fb8929fd9c8e7b218da16.webp 800w, https:\/\/www.wtauserver.com\/wp-content\/uploads\/2025\/07\/96cccfca152fb8929fd9c8e7b218da16-300x175.webp 300w, https:\/\/www.wtauserver.com\/wp-content\/uploads\/2025\/07\/96cccfca152fb8929fd9c8e7b218da16-768x448.webp 768w, https:\/\/www.wtauserver.com\/wp-content\/uploads\/2025\/07\/96cccfca152fb8929fd9c8e7b218da16-18x12.webp 18w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/p>\n<ul>\n<li>\u200b<strong>Mechanical linkage intelligent trigger<\/strong>The device is driven by a drum shaft through<strong>Worm gear transmission system<\/strong>Accurately transmit the number of rotations of the drum (corresponding to the height of the lifting gear).<\/li>\n<li>\u200b<strong>Precise control of CAM limit<\/strong>The CAM installed on the worm wheel shaft rotates along with the transmission. When the lifting gear approaches the preset dangerous height (i.e., the drum reaches the set number of turns),<strong>The flange of the CAM precisely touches the preset limit switch<\/strong>\u200b.<\/li>\n<li>\u200b<strong>Forced power-off brake<\/strong>After the limit switch is triggered,<strong>Instantly cut off the power source of the lifting (or lowering) mechanism<\/strong>It also activates the braking system to force the lifting gear to stop immediately before reaching the safety limit position, effectively preventing accidents such as overtopping and over-limit falls.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>\u200b<strong>3. Core Technologies<\/strong>\u200b<\/h3>\n<p>The high performance and reliability of the QGX lifting height limiter stem from the following core technologies:<\/p>\n<ul>\n<li>\u200b<strong>Precision transmission system of worm gear and worm<\/strong>The core transmission mechanism converts the large number of rotations of the drum into the precise small-angle rotation of the worm wheel shaft, achieving an accurate correspondence between the height of the lifting gear and the position of the CAM. It features a stable structure, a large transmission ratio and good self-locking performance.<\/li>\n<li>\u200b<strong>Multi-contact adjustable CAM limit mechanism<\/strong>\u200b\n<ul>\n<li>Standard configuration of the device<strong>Four to eight independent adjustable limit switches<\/strong>\u200b.<\/li>\n<li>The position of each limit switch can be adjusted as needed<strong>It can be set arbitrarily within the range from 0 to the maximum number of working turns of the drum (40\/80\/120 turns)<\/strong>\u200b.<\/li>\n<li>Limit switch<strong>The contact form (normally open NO\/normally closed NC) can be freely selected according to the requirements of the control circuit<\/strong>\u200b.<\/li>\n<li>This design allows users to target<strong>Multiple protections are set for both ascent and descent<\/strong>(For example: warning limit + forced stop protection limit).<\/li>\n<\/ul>\n<\/li>\n<li>\u200b<strong>Wide-temperature durable structure<\/strong>Design adaptation<strong>\u200b-25\u2103 \u81f3 +60\u2103\u200b<\/strong>The wide ambient temperature range ensures stable operation in extremely cold and hot conditions.<\/li>\n<li>\u200b<strong>Industrial-grade electrical components<\/strong>The key limit switches meet the requirements of industrial environments.<strong>Rated voltage AC380V, rated current 2.5A<\/strong>It can be directly connected to the main control circuit.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>\u200b<strong>4. Core advantages<\/strong>\u200b<\/h3>\n<p>The significant advantages of the QGX lifting height limiter make it a benchmark for safety protection:<\/p>\n<ul>\n<li>\u200b<strong>Strong versatility, widely applicable<\/strong>\u200b\n<ul>\n<li>Unique<strong>Design for matching the number of drum turns<\/strong>(A:0-40 turns\/B:0-80 turns\/C:0-120 turns) Covering standard and non-standard drums for cranes ranging from 5T to 250T.<\/li>\n<li>Powerful<strong>Contact selection (NO\/NC) and position adjustment function<\/strong>Make it perfectly compatible<strong>All kinds of cranes (bridge type, gantry type, boom type), elevators, lifts and other displacement machinery with lifting height risks<\/strong>\u200b.<\/li>\n<\/ul>\n<\/li>\n<li>\u200b<strong>Accurate and reliable, well-tested<\/strong>\u200b\n<ul>\n<li>\"Through<strong>Authoritative type test certification for special equipment<\/strong>Prove that it meets the highest safety standards.<\/li>\n<li>The core transmission and mechanical limit structure are stable.<strong>The normal service life can reach more than ten years<\/strong>Reduce maintenance costs and ensure continuous safety.<\/li>\n<\/ul>\n<\/li>\n<li>\u200b<strong>Easy to install and maintain<\/strong>\u200b\n<ul>\n<li>The structure is clear and the accessories are complete<strong>The installation process is simple and fast<\/strong>\u200b.<\/li>\n<li>\u200b<strong>Years of user practice verification<\/strong>\u200b\uff0c\u200b<strong>The end user installs it by themselves and resets and reinstalls it later<\/strong>All feedback was smooth and positive, significantly reducing downtime.<\/li>\n<\/ul>\n<\/li>\n<li>\u200b<strong>Multiple protections, safety redundancy<\/strong>It provides multiple independently settable limit points, allowing for the configuration of redundant protection (such as early warning + emergency stop), which greatly enhances the system's safety.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>\u200b<strong>5. Practical cases<\/strong>\u200b<\/h3>\n<p>The QGX lifting height limiter has been widely applied in the following key areas, effectively safeguarding the safety of equipment and personnel<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-7187 aligncenter\" src=\"https:\/\/www.wtauserver.com\/wp-content\/uploads\/2025\/07\/1-4.webp\" alt=\"Shanghai power equipment assembly QGX elevation limiter\" width=\"1200\" height=\"500\" srcset=\"https:\/\/www.wtauserver.com\/wp-content\/uploads\/2025\/07\/1-4.webp 1200w, https:\/\/www.wtauserver.com\/wp-content\/uploads\/2025\/07\/1-4-300x125.webp 300w, https:\/\/www.wtauserver.com\/wp-content\/uploads\/2025\/07\/1-4-1024x427.webp 1024w, https:\/\/www.wtauserver.com\/wp-content\/uploads\/2025\/07\/1-4-768x320.webp 768w, https:\/\/www.wtauserver.com\/wp-content\/uploads\/2025\/07\/1-4-18x8.webp 18w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/p>\n<ul>\n<li>\u200b<strong>All kinds of bridge and gantry cranes<\/strong>In large manufacturing workshops, port storage yards, and steel enterprises, precisely limit the lifting height of the hook to prevent it from hitting the factory building or the lifting gear at the top.<\/li>\n<li>\u200b<strong>Various types of boom cranes (truck cranes, crawler cranes, etc.) :<\/strong>At construction sites and equipment installation sites, ensure that the hook never exceeds the highest safety point when the boom Angle changes, to avoid the risk of structural damage or overturning.<\/li>\n<li>\u200b<strong>Elevators and lifting platforms<\/strong>In the field of vertical transportation, precisely control the travel limit of the car or platform to prevent it from hitting the top of the hoistway and ensure passenger safety.<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-7188 aligncenter\" src=\"https:\/\/www.wtauserver.com\/wp-content\/uploads\/2025\/07\/2-4.webp\" alt=\"Install the QGX elevation limiter at Wujin Gorge\" width=\"1200\" height=\"500\" srcset=\"https:\/\/www.wtauserver.com\/wp-content\/uploads\/2025\/07\/2-4.webp 1200w, https:\/\/www.wtauserver.com\/wp-content\/uploads\/2025\/07\/2-4-300x125.webp 300w, https:\/\/www.wtauserver.com\/wp-content\/uploads\/2025\/07\/2-4-1024x427.webp 1024w, https:\/\/www.wtauserver.com\/wp-content\/uploads\/2025\/07\/2-4-768x320.webp 768w, https:\/\/www.wtauserver.com\/wp-content\/uploads\/2025\/07\/2-4-18x8.webp 18w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/p>\n<ul>\n<li>\u200b<strong>Application effect examples<\/strong>For instance, in a 250T gantry crane renovation project of a large shipyard, the QGX-C type limiter (with a range of 120 turns) was adopted, and two lifting protection limits were precisely set. After debugging, the operation was stable. The limit was accurately triggered and the power was cut off several times before the hook approached the dangerous height, avoiding potential major equipment losses and earning high recognition from the customer.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>\u200b<strong>6. Technical parameters<\/strong>\u200b<\/h3>\n<p>The key specifications of the QGX lifting height limiter are as follows:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-7186 aligncenter\" src=\"https:\/\/www.wtauserver.com\/wp-content\/uploads\/2025\/07\/cf2a445f61236159e2ea241cc79942d5.webp\" alt=\"Technical parameters of QGX type Lifting height limiter\" width=\"905\" height=\"827\" srcset=\"https:\/\/www.wtauserver.com\/wp-content\/uploads\/2025\/07\/cf2a445f61236159e2ea241cc79942d5.webp 1200w, https:\/\/www.wtauserver.com\/wp-content\/uploads\/2025\/07\/cf2a445f61236159e2ea241cc79942d5-300x274.webp 300w, https:\/\/www.wtauserver.com\/wp-content\/uploads\/2025\/07\/cf2a445f61236159e2ea241cc79942d5-1024x935.webp 1024w, https:\/\/www.wtauserver.com\/wp-content\/uploads\/2025\/07\/cf2a445f61236159e2ea241cc79942d5-768x701.webp 768w, https:\/\/www.wtauserver.com\/wp-content\/uploads\/2025\/07\/cf2a445f61236159e2ea241cc79942d5-13x12.webp 13w\" sizes=\"auto, (max-width: 905px) 100vw, 905px\" \/><\/p>\n<ul>\n<li>\u200b<strong>Environmental adaptability<\/strong>Working environment temperature range<strong>\u200b-25\u2103 \u81f3 +60\u2103\u200b<\/strong>\u200b.<\/li>\n<li>\u200b<strong>Electrical parameters<\/strong>\u200b\n<ul>\n<li>Rated working voltage<strong>\u200bAC 380V\u200b<\/strong>\u200b<\/li>\n<li>Rated working current<strong>\u200b2.5A\u200b<\/strong>\u200b<\/li>\n<\/ul>\n<\/li>\n<li>\u200b<strong>Mechanical protection capability<\/strong>\u200b\n<ul>\n<li>\u200b<strong>Number of limit switches<\/strong>\u200b \u200b<strong>4 to 8<\/strong>(The specific quantity is determined by model.<strong>Adjustable limit switch<\/strong>\u200b.<\/li>\n<li>\u200b<strong>Contact status<\/strong>\u200b \u200b<strong>Normally open (NO) or normally closed (NC) contacts can be selected on-site according to control requirements<\/strong>\u200b.<\/li>\n<\/ul>\n<\/li>\n<li>\u200b<strong>Matching range of drum turns<\/strong>\u200b\n<ul>\n<li>\u200b<strong>QGX-A type<\/strong>Applicable effective working turns of the drum<strong>0 to 40 laps<\/strong>(Corresponding to 5T-250T cranes).<\/li>\n<li>\u200b<strong>QGX-B type<\/strong>Applicable effective working turns of the drum<strong>0 to 80 laps<\/strong>(Corresponding to 5T-250T cranes).<\/li>\n<li>\u200b<strong>QGX-C type:<\/strong>Applicable effective working turns of the drum<strong>0 to 120 laps<\/strong>(Corresponding to 5T-250T cranes).<\/li>\n<\/ul>\n<\/li>\n<li>\u200b<strong>Main dimensions (refer to the illustration) :<\/strong>\u200b\n<ul>\n<li>Key installation hole spacing (example) :<strong>\u200b95mm\u200b<\/strong>\u200b, \u200b<strong>\u200b120mm\u200b<\/strong>\u200b, \u200b<strong>\u200b150mm\u200b<\/strong>\u200b, \u200b<strong>\u200b170mm\u200b<\/strong>(Marked positions in the picture).<\/li>\n<li>Installation hole diameter<strong>\u200b\u00d810.3mm\u200b<\/strong>(Or the aperture is clearly marked in other diagrams).<\/li>\n<li>Device depth\/thickness (example) :<strong>\u200b65mm\u200b<\/strong>(Marked positions in the picture).<\/li>\n<li>Other reference dimensions<strong>\u200b35mm\u200b<\/strong>(Marked positions in the figure), the main body length is approximately<strong>\u200b162mm\u200b<\/strong>Etc. (Subject to the actual marking in the illustration).<\/li>\n<\/ul>\n<\/li>\n<li>\u200b<strong>Important Notice<\/strong>\u200b\n<ul>\n<li>The key dimensions shown in the illustration provide an accurate basis for the actual installation positioning.<\/li>\n<li>\u200b<strong>The corresponding range of drum turns must be strictly selected in accordance with the model<\/strong>\u200b.<\/li>\n<\/ul>\n<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>1. Industry pain point: Risk of out-of-control lifting height: When cranes, elevators, lifts and other equipment are performing lifting operations, if the lifting gear (hook, car, [...]) gets out of control,<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[129],"tags":[],"class_list":["post-7184","post","type-post","status-publish","format-standard","hentry","category-additional-parts"],"_links":{"self":[{"href":"https:\/\/www.wtauserver.com\/en\/wp-json\/wp\/v2\/posts\/7184","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.wtauserver.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.wtauserver.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.wtauserver.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wtauserver.com\/en\/wp-json\/wp\/v2\/comments?post=7184"}],"version-history":[{"count":3,"href":"https:\/\/www.wtauserver.com\/en\/wp-json\/wp\/v2\/posts\/7184\/revisions"}],"predecessor-version":[{"id":8130,"href":"https:\/\/www.wtauserver.com\/en\/wp-json\/wp\/v2\/posts\/7184\/revisions\/8130"}],"wp:attachment":[{"href":"https:\/\/www.wtauserver.com\/en\/wp-json\/wp\/v2\/media?parent=7184"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.wtauserver.com\/en\/wp-json\/wp\/v2\/categories?post=7184"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.wtauserver.com\/en\/wp-json\/wp\/v2\/tags?post=7184"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}