In hoisting operations, steel wire rope overwinding (the hook rising above the safe height) is a major safety hazard, which can easily lead to the following consequences:
Steel wire rope breakage: Causing heavy objects to fall and triggering serious equipment damage or casualty accidents.
Impact damage to structural components: The hook or spreader rising at high speed violently impacts hoisting machinery components (e.g., jibs, trolley frames), resulting in deformation or damage.
Production interruption and property loss: Shutdowns, maintenance and compensation caused by accidents lead to huge economic losses.
Traditional mechanical limit devices or manual observation are not only unreliable, but also more prone to failure under harsh working conditions such as dust and humidity. A highly reliable and automated electrical protection method is urgently needed.
2. Solution
The WTAU WGJ Anti-overwinding Switch (also known as Hook Head Limit Switch/Weight Hammer Limit Switch) is an electrical automatic protection device specially designed to address the risk of steel wire rope overwinding. The core of this solution is as follows:
Intelligent linkage mechanism: The switch works in linkage with a weight hammer of appropriate counterweight.
Safety action trigger: When the hook rises and lifts the weight hammer, the switch is activated toautomatically cut off the power supply of the winch and instantly connect the braking system,forcing the hook to stop rising.
Height limit protection:Through reliable physical linkage and electrical control, it ensures that the hook rises and falls within the set safe height range, effectively preventing overwinding accidents.
This solution realizes fully automatic safety protection for key links in the lifting process.
3. Core Technologies
The outstanding performance of the WGJ Anti-overwinding Switch stems from its core design and manufacturing technologies:
Precision structural design:Adopting ahigh-strength zinc alloy precision cast housing,it features a compact structure with high durability, and can withstand impacts and vibrations common in industrial sites.
IP66 protection rating: With an IP66dust and water protection grade, the internal components of the switch can still work reliably and have a long service life even in harsh environments such as heavy dust, water spray and humidity.
Selected core components: High-reliability precision parts such as contacts,switch mechanisms and springs are carefully selected to ensure accurate action, rapid response and long service life of the switch.
Intelligent working condition adaptation:The unique technology ofon-site adjustable NO/NCcontact status enables the switch to flexibly adapt to the requirements of different control circuits with strong universality.
4. Core advantages
The core advantages of the WGJ Anti-overwinding Switch make it an ideal choice for hoisting safety protection:
Super protection, stable and reliable:Zinc cast housing plus IP66 protection rating, combined with selected components, ensures stable operation under various severe working conditions, reduces maintenance needs and greatly improves equipment and operation safety.
Flexible adaptation, rapid deployment: The switch contact status (NO/NC) can be quickly adjusted on-site,easily meeting the requirements of different crane control systems. Installation and relocation are extremely simple and fast; user feedback shows high efficiency in both factory installation and subsequent relocation and reinstallation after maintenance or equipment upgrading, reducing downtime.and subsequentrelocation and reinstallation after maintenance or equipment upgrading, reducing downtime.
Simple and efficient, user-friendly: With an intuitive design and clear operation logic, years of practice by users (including end users) have proven that it is easy to install, debug, maintain and reset..
5. Practical cases
Relying on its reliability and adaptability, the WGJ Anti-overwinding Switch has been widely applied and verified on a variety of mainstream hoisting equipment:
Widely applicable scenarios
Overhead and gantry cranes (standard application)
Mobile cranes, rubber-tyred cranes
Crawler crane
Various overhead, gantry and rail cranes with jibs, etc.
Practical Application Effects:It has been successfully applied to hoisting equipment in numerous large manufacturing workshops, ports and terminals, logistics and warehousing bases, construction sites and other places at home and abroad. Verified by actual user use, the switch has the following performance:
Effective prevention of overwinding accidents:Accurately triggering protective actions for many consecutive years, it reliably prevents rope breakage or equipment impact accidents caused by steel wire rope overwinding.
Reduce maintenance costs: The robust design and excellent protection significantly reduce the failure rate and maintenance frequency caused by environmental factors.
Improve work efficiency: The simple installation and debugging process, as well as the feature supporting independent relocation and reset by users, greatly reduce downtime.
6. Technical parameters
The specific technical specifications of the WGJ Anti-overwinding Switch are directly related to its reliability and applicability. Clearly marked according to the product diagram, the core parameters are as follows:
Electrical characteristics
Wide voltage compatibility: 12V to 380V(compatible with both DC and AC power supply systems).both DCandAC powersupply systems).
Current specificationRated current is5A, rated operating current is10A.
Key components of mechanical linkage
Minimum counterweight of weight hammer: ≥ 1.9Kg ≥ 1.9Kg(to ensure the hook can reliably lift the weight hammer and trigger the switch action when rising).
Standard wire rope length 0.85m(for connecting the hook and the weight hammer).
Installation dimensions
Key mounting hole distances:42.5mmwith60mm.
Mounting hole diameter:Φ10.3mm.
Reference length of switch main body:162mm.
Complete Working Unit
Configuration: A complete anti-overwinding switch working unit must include the WGJ switch body, matching weight hammer and switch connecting wire..
