Why should overhead crane be equipped with height limiter

Height limiter is a necessary safety device for bridge crane, which is used to limit the rising height of the pick-up device. When the lifting appliance of the bridge crane rises to the upper limit position, the limiter will automatically cut off the power supply to prevent the lifting device such as the hook from continuing to rise, causing the crane to rush to the top. After the steel wire rope shrinks completely, the electric hoist or winch will continue to work and break the steel wire rope, causing a heavy object falling accident.

The height limiter device combines the travel switch with the convex concave brace structure, which has the advantages of simple structure and sensitive action, effectively inhibits the occurrence of heavy object falling accidents and ensures the safe production of the crane on the working site. After several years of use, the effect is remarkable. Structure and installation: fix the travel switch in the semi closed protective box made of thin steel plate with bolts. Two slideway seats are welded at the bottom of the protective box, and the convex and concave brace can move left and right along the slideway in the slideway seat. A small hole is drilled at one end of the convex concave brace to fix the thin steel wire rope or nylon rope. Thin wire rope veneron rope is used to set the limit height.

The height limiter can effectively protect the lifting mechanism of the crane from excessive traction. Therefore, bridge cranes should be equipped with height limiters.

What are the safety devices of bridge crane and what are their functions?

In order to ensure the normal use of the bridge crane, eliminate the possible accidents of the bridge crane in the lifting operation, and ensure the life safety of the operators., As a lifting equipment for lifting materials across workshops, warehouses and stockyards, bridge cranes are equipped with a variety of safety protection devices. Common protection devices include lifting limiter, limiter, buffer, anti-collision device, anti deflection and deflection indication device, anti overturning, anti wind damage and other safety protection devices.

1.  Overload operation of lifting limiter is an important cause of frequent bridge crane accidents. The use of overload protection device can prevent accidents.
2.  There are two types of limiters: one is the rising limit position limiter and the falling limit position limiter to protect the safe operation of the lifting mechanism, and the other is the operation limit position limiter to limit the operation of the operating mechanism.
3.  The buffer absorbs the operation function of the lifting trolley to slow down the impact.
4.  Anti collision device the running speed of modern bridge cranes is increasing. Several machines often run on the same track at the same time. In order to prevent mutual collision between bridge cranes, anti-collision devices are installed on the bridge cranes.
5.  Due to the deviation of wheel manufacturing and installation and the deviation of transmission mechanism, the anti deflection device often deflects the operation of bridge crane. In serious cases, there will be "rail gnawing phenomenon" and even affect the metal structure and operation mechanism.
6.  Other safety protection devices
   1. The electrical equipment on the bridge shall be provided with rain cover
   2. The single main beam bridge crane is equipped with anti overturning safety hook to ensure that the trolley does not overturn and ensure the safety of maintenance work.

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