Crane with stall protection function

Abstract

The invention relates to the technical field of fabricated buildings, and discloses a crane with a stall protection function. The inner wall of a shell is fixedly connected with a fixing groove, and the inner wall of the fixing groove is fixedly connected with an air bag. According to the crane with the stall protection function, a cable movably connected to the outer side of a cable rotating shaft penetrates out through the shell, a movable groove and a through hole formed in the middle of an electromagnet, when the rotating speed of the cable rotating shaft is too high and the cable is loosened too fast, the temperature of the cable rotating shaft is increased, the air bag absorbs heat and expands upwards to drive a dielectric plate, the relative area between a positive plate and a negative plate is changed to generate current, the current exceeds the minimum resistance value of a piezoresistor, the piezoresistor electrifies the electromagnet, the electromagnet generates a magnetic field, a magnetostrictive rod is affected by the magnetic field to extend, an abutting block is driven to move inwards to clamp the cable, meanwhile, according to the Lenz's law, the principle of rejecting and remaining is adopted, rapid loosening of the cable is prevented, and objects hoisted at the bottom of the cable are prevented from falling off.

Description

technical field [0001] The invention relates to the technical field of prefabricated buildings, in particular to a crane with a stall protection function. Background technique [0002] Prefabricated buildings refer to the transfer of a large number of on-site operations in the traditional construction method to the factory, where the building components and accessories are processed and manufactured, transported to the construction site, and then assembled and installed on site through reliable connection methods. In this process, in addition to the need to connect the building, it is also necessary to use a crane to transport the building components. [0003] However, at present, all cranes must rely on electric motors to drive their operation. For safety, it is limited to run within a certain speed, and if it runs beyond the speed, it will cause accidental injury. Because the speed of the motor will be changed by factors such as frequency and voltage, when the inverter f...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a crane with a stall protection function, which has the advantages of stall protection and solves the problem of out-of-control rotational speed

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