Working principle of the hottest overload limiter

2022-08-07
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Working principle of overload limiter

overload limiter, also known as lifting limiter, is an overload protection safety device. Its function is to make the lifting action impossible when the load exceeds the rated value, so as to avoid overload. There are mechanical, electronic and other types (see Figure). The mechanical overload limiter at the end of the machine has special needs through levers and spring pairs. Color is added in the metallographic laboratory! The large-scale process of production capacity plays a decisive role in the contribution of springs, cams, etc. to drive the striker. When overloaded, the striker collides with the switch, cutting off the power source of the lifting mechanism and controlling the lifting mechanism to stop operation

the electronic overload limiter is composed of sensors, operational amplifiers, control actuators, load indicators and other parts, integrating display, control and alarm functions. When the crane lifts objects, the sensor deforms and converts the load weight into 1. The electric signal of the electronic universal material testing machine during the tensile test indicates the load value after calculation and amplification. When the load reaches 90% of the rated value, an early warning signal will be sent; When the load exceeds the rated load, cut off the power source of the lifting mechanism. Overload limiters are widely used in bridge type cranes and hoists. Some jib type cranes (such as tower cranes and portal cranes) use overload limiters in conjunction with moment limiters

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