Crane gliding-proof hook control device

Abstract

A crane anti-slipping control device which can prevent a heavy project from descending when the motor starting moment becomes small due to electricity or overweight. The invention is connected with the controller of the crane, and a rotating speed collecting device, an executive circuit, a programmable controller, a main order controller with signal interface are arranged on the crane. The CPU inside the programmable controller is stored with the signal of the move direction of the motor collected by the rotating speed signal collecting device, the program comparing rotating speed signal with the initial setting parameter, the program converting the rotating speed signal into travel signal and the comparative program. The invention collects the rotating speed data through a signal collector arranged on the transmission part and inputs the data into the programmable controller to compare with the data set in the controller. The system works normally when the rotating speed data matches the comparing condition; when the rotating speed data exceeds the set data, the order of the programmable controller executes the motion of the electro circuit so as to protect the whole machine.

Description

technical field [0001] The invention relates to a control device for the stall safety protection of a crane, in particular to an anti-slip hook control device for a crane which can prevent the starting torque of a motor from becoming small due to electrical or overweight reasons, thereby causing heavy objects to fall during hoisting. Background technique [0002] At present, during the working process of the crane, sometimes the phenomenon of slipping the hook when the starting moment is reduced due to electrical or overweight reasons occurs when the crane is hoisted or the heavy object falls during the hoisting process. Lifting objects and equipment will be damaged, and personal injury accidents may also occur. In the patent application published by the State Intellectual Property Office, the application number is 03227441.6, and the name is "crane stall protection device", which introduces a technical solution for setting a protector on the transmission shaft of the crane ...

AI Technical Summary

Problems solved by technology

This kind of brake generally adopts frictional braking. When the weight of the lifting object is large, its braking effect is poor, and the phenomenon of hook slipping will still occur.

And in the long-term work, due to the mechanical failure of the brake, the occasional hook slip occurs from time to time

[0003] The control part of many such devices is relatively simple, and it is difficult to distinguish when the crane suspension is started, the hook drops slightly and then rises normally, and the slight drop is regarded as a stall state for protection

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