Introduction of overload protection device for the

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Introduction to overload protection device of hoisting machinery

1) overload protection device

(1) form and function: overload protection device can be divided into automatic stop type and comprehensive type according to its different functions. According to the structural type, there are electrical type and mechanical type

overload protection protest is becoming a microcosm of the downturn of the coal and steel industry. The device should have dynamic load suppression function, automatic work function and automatic insurance function

(2) the number of original workers reached 25000. The lifting weight limiter is mainly used for bridge cranes, and its leading product is electrical type. Electrical products are generally composed of load sensors and secondary instruments

the load sensor adopts resistance strain sensor or piezomagnetic sensor, and special installation accessories are configured according to the installation position. The structural forms of the sensor mainly include pressure type, pull type and shear beam type

2) moment limiter

(1) moment limiter of tower crane with boom luffing. Tower cranes with luffing boom generally use mechanical torque limiters

(2) overload protection device of trolley luffing crane. Trolley luffing cranes generally use lifting load limiter and lifting torque limiter to jointly implement overload protection

(3) overload protection device of mobile crane. Mobile cranes generally use moment limiters for overload protection

3) anti collision device

there are two main structural types of anti-collision device

(1) reflex type. It is composed of transmitter, receiver, controller and reflector

(2) direct type. The detection wave does not pass through the reflector. At present, the comprehensive self-sufficiency rate of the daily pole changing precursor market of new chemical materials in China is only about 60%. The reflected products are collectively referred to as direct type

4) dangerous voltage alarm

when the jib crane operates near the transmission line, due to improper operation, the jib and steel wire rope are too close to or even touch the wire, which will cause electric shock or electric shock accidents. In order to prevent such accidents, Eastern Europe, Japan and other countries have developed dangerous voltage alarms since the 1970s, and now they have entered the stage of serial production

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