{"id":8613,"date":"2026-07-23T15:43:10","date_gmt":"2026-07-23T07:43:10","guid":{"rendered":"https:\/\/www.wtauserver.com\/?p=8613"},"modified":"2026-07-23T16:26:41","modified_gmt":"2026-07-23T08:26:41","slug":"overspeed-switch-for-overhead-crane-lifting-mechanism","status":"publish","type":"post","link":"https:\/\/www.wtauserver.com\/en\/overspeed-switch-for-overhead-crane-lifting-mechanism\/","title":{"rendered":"Complete set of transformation plan for overspeed protection of variable frequency bridge gantry crane lifting mechanism"},"content":{"rendered":"
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1. Compliance basis for program preparation<\/h2>\n<\/div>\n
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According to the current special equipment specificationsTSG 51-2023 \"Lifting Machinery Safety Technical Regulations\" Clause A4.1.2.7<\/strong>It is clearly stipulated that the lifting mechanisms of bridge and gantry cranes in the form of frequency conversion speed regulation, permanent magnet direct drive, and energy consumption brake control must be equipped with independent overspeed safety protection devices.<\/p>\n

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At this stage, there are generally three types of hidden dangers of frequency conversion cranes in use in a large number of steel mills and ports: the original factory is not equipped with overspeed protection, the original overspeed switch is aging and failing, and the protection circuit is not independent. Every year, regular inspections of special equipment will determine rectification items. In view of the pain points of the industry, Weite Electromechanical has launched a complete set of integrated speed measurement and overspeed protection rectification solutions, all of which are configured to meet the acceptance standards of the Special inspection Institute, and one-stop solutions to problems such as annual inspection failure and safety supervision penalties.<\/p>\n<\/div>\n<\/div>\n

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\"Real<\/div>\n<\/div>\n
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Real scene of industrial double-beam inverter bridge crane<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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2. The composition of the complete set of equipment: integrated sensor assembly for speed measurement and acquisition + overspeed protection<\/h2>\n<\/div>\n
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The core of the complete protection system isHeavy-duty integrated speed sensor assembly<\/strong>, Collect the speedHeavy duty encoder<\/a>Integrated with the overspeed protection switch, it is installed on the output drive shaft of the lifting motor by direct connection of the keyway, eliminating the need to reserve two sets of equipment installation space separately, greatly simplifying the on-site wiring and assembly process.<\/div>\n
\"Heavy<\/div>\n<\/div>\n
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Core advantages of equipment adaptation to working conditions<\/h3>\n<\/div>\n
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  1. Heavy-duty mechanical structure, impact and wear resistance<\/strong>\n
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    The shaft of the equipment adopts a solid stainless steel keyed structure, which can withstand the radial and axial impact loads caused by frequent start and stop of the crane; the whole machine is made of all-metal sealed housing with a protection level of IP66, dustproof, waterproof, and oil-resistant. It is suitable for the harsh operating environment of high temperature radiation, high dust, and strong vibration in metallurgical workshops, and it is stable for a long time.run.<\/li>\n

  2. Strong electrical compatibility, anti-frequency conversion electromagnetic interference<\/strong>\n
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    Support multiple types of signal output, and the mainstream lifting frequency converters and PLC control systems on the market can be directly matched; wide-voltage power supply design, internal integrated reverse connection and short-circuit protection circuits, effectively avoid harmonic interference of frequency conversion equipment; pulse resolution, multiple gears are optional, taking into account the needs of high-precision speed closed-loop control.<\/li>\n

  3. Dual-type overspeed protection structure, according to demand selection<\/strong><\/li>\n<\/ol>\n<\/div>\n
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    (1) Mechanical centrifugal overspeed protection (the first choice for high-risk working conditions)<\/h4>\n<\/div>\n
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    Relying on physical centrifugal force to achieve the trigger action, no external power supply is required. Even if the whole machine is powered off or the main control system fails, the safety brake circuit can still be cut off independently, and the safety redundancy level is high. Suitable for the transformation of high-risk lifting equipment such as old metallurgical casting cranes and molten metal hoisting; the contacts are divided into two specifications, normally open and normally closed, and are directly connected in series to the crane safety brake circuit, which instantly cuts off the circuit and locks the hook when speeding.<\/div>\n<\/div>\n
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    (2) Electronic intelligent overspeed protection (standard for new intelligent driving)<\/h4>\n<\/div>\n
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    Collect motor speed pulse data in real time, and output alarm and shutdown signals through passive relays after overspeed; support custom setting of single-stage and double-stage overspeed thresholds, and the equipment can automatically store overspeed fault records to facilitate later fault traceability and equipment maintenance, and it is mostly used for new intelligent frequency conversion driving equipment.<\/div>\n
    \"Installation<\/div>\n<\/div>\n
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    Installation of speed measuring and overspeed device at the end of the lifting reel<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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    3. The operating principle of the equipment and the core safety protection functions<\/h2>\n<\/div>\n
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    1. Uninterrupted real-time speed acquisition<\/strong>\n
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      The integrated speed measuring and sensing components operate synchronously with the motor drive shaft, continuously collect pulse data of the motor and reel speed, and monitor the lifting speed of the lifting mechanism online 24 hours a day, without monitoring blind spots.<\/li>\n

    2. Intelligent graded overspeed threshold determination<\/strong>\n
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      The control system stores the rated safe speed parameters of the equipment, compares the measured speed with the preset protection threshold in real time, and can flexibly adjust and adjust the parameters according to the on-site load and operating environment.<\/li>\n

    3. Extremely fast braking response to curb the hook from falling overspeed<\/strong>\n
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      When the measured speed exceeds the critical range of 10% to 15% of the rated safety limit, the system outputs a passive shutdown signal within 0.5 seconds, connects to an independent safety circuit of the equipment, and drives the brake to brake urgently, so as to prevent the crane from losing control of the hook and falling accidents from the root cause.<\/li>\n

    4. Electromechanical dual redundancy pocket bottom protection<\/strong>\n
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      The complete set of system is equipped with a dual protection structure of electrical overspeed monitoring + mechanical centrifugal overspeed; once the electrical control system fails and the site is accidentally powered off, the mechanical overspeed mechanism can act independently to forcibly cut off the safety circuit, which fully complies with the redundant safety design specifications of special equipment.<\/li>\n

    5. Local storage and traceability of fault data<\/strong>\n
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      The electronic integrated model can automatically keep all overspeed alarms and equipment operation records. The data cannot be tampered with, and can be exported at any time as valid certificates for equipment maintenance, special equipment inspection, and safety accident traceability.<\/li>\n<\/ol>\n

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      4, three types of implementation service plans<\/h2>\n<\/div>\n
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      Solution 1: The new machine is shipped with a pre-installed solution<\/h3>\n<\/div>\n
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      Brand new bridge and gantry cranes are installed synchronously at the factory stage with integrated overspeed protection assemblies, and the sensor speed signal is connected to the frequency conversion control system to achieve precise speed regulation and anti-slip hook control; the overspeed safety circuit is individually wired and physically isolated from the main control circuit to meet the mandatory requirements of the national standard \u201cindependent protection\u201d, and the equipment can be shipped out of the factory.Pass the special inspection and receive it at once.<\/div>\n<\/div>\n
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      Option 2: Retrofit and renovation plan for old unprotected vehicles<\/h3>\n<\/div>\n
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      For stock vehicles that are not equipped with overspeed protection devices in the original factory, one-stop services for on-site working condition survey, electrical wiring transformation, and commissioning of the whole machine are provided; relying on the original motor installation structure to optimize the installation site, the construction period is short, and the length of the company's shutdown is greatly reduced. After the transformation is completed, a full set of acceptance data is issued to ensureSuccessfully passed the annual special equipment inspection.<\/div>\n<\/div>\n
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      Option 3: Replacement and rectification plan for the original overspeed device<\/h3>\n<\/div>\n
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      When the overspeed equipment supporting the original vehicle has non-independent circuits, substandard parameters, burnt-out contacts and failed non-compliance problems, remove the original split accessories, replace the integrated speed measurement overspeed assembly, re-optimize the wiring of the safety circuit, complete the re-inspection of the whole machine, calibrate the parameters, and eliminate the hidden dangers of annual inspection and rectification.<\/div>\n
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      5. Core highlights of the complete set of solutions<\/h2>\n<\/div>\n
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      1. Worry-free compliance, successfully passed various safety inspections<\/strong>\n
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        The design of the whole machine is fully benchmarked with the TSG 51-2023 lifting specification to solve the problems of unqualified annual inspection and administrative penalties for safety supervision caused by the lack of overspeed protection, and complete acceptance of technical data.<\/li>\n

      2. Integrated, cost-effective is better than split procurement<\/strong>\n
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        A single set of equipment simultaneously realizes the dual functions of inverter speed feedback and independent overspeed shutdown. There is no need to purchase the encoder + independent overspeed switch separately, which reduces the comprehensive cost of equipment procurement and on-site installation.<\/li>\n

      3. Strong adaptability to harsh working conditions, reduce maintenance costs<\/strong>\n
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        The heavy-duty industrial-grade protective structure is suitable for the complex environments of metallurgy, ports, and heavy-duty processing workshops. The equipment has a long service life and reduces the frequency of late troubleshooting and replacement of accessories.<\/li>\n

      4. Customized adaptation, suitable for various on-site working conditions<\/strong>\n
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        Equipment shaft diameter, pulse specifications, signal output mode, and speed threshold of overspeed action can be customized and matched according to on-site driving tonnage, motor parameters, and operating requirements.<\/li>\n<\/ol>\n

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        6. Supporting full-process technical services<\/h2>\n<\/div>\n
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        1. Free on-site site survey, equipment technical selection, and calculation of overspeed action parameters\uff1b<\/li>\n
        2. Provide standardized electrical wiring drawings, online remote installation guidance, and electrical debugging of the whole machine\uff1b<\/li>\n
        3. Undertake batch on-site renovation services for multiple vehicles in the factory area, and complete a full set of technical files for supporting rectification.\uff1b<\/li>\n<\/ol>\n<\/div>","protected":false},"excerpt":{"rendered":"

          \u4e00\u3001\u65b9\u6848\u7f16\u5236\u5408\u89c4\u4f9d\u636e \u6839\u636e\u73b0\u884c\u7279\u79cd\u8bbe\u5907\u89c4\u8303TSG 51-2023\u300a\u8d77\u91cd\u673a\u68b0\u5b89\u5168\u6280\u672f\u89c4\u7a0b\u300b\u6761\u6b3e A4.1.2.7 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[142,131],"tags":[],"class_list":["post-8613","post","type-post","status-publish","format-standard","hentry","category-automobile-manufacturing","category-transportation-bridges"],"_links":{"self":[{"href":"https:\/\/www.wtauserver.com\/en\/wp-json\/wp\/v2\/posts\/8613","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=8613"}],"version-history":[{"count":8,"href":"https:\/\/www.wtauserver.com\/en\/wp-json\/wp\/v2\/posts\/8613\/revisions"}],"predecessor-version":[{"id":8624,"href":"https:\/\/www.wtauserver.com\/en\/wp-json\/wp\/v2\/posts\/8613\/revisions\/8624"}],"wp:attachment":[{"href":"https:\/\/www.wtauserver.com\/en\/wp-json\/wp\/v2\/media?parent=8613"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.wtauserver.com\/en\/wp-json\/wp\/v2\/categories?post=8613"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.wtauserver.com\/en\/wp-json\/wp\/v2\/tags?post=8613"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}