Safety protection device for hoisting mechanism of crane and protection method thereof

Abstract

The invention discloses a safety protection device for a hoisting mechanism of a crane and a protection method thereof. The safety protection device comprises a shell, a microprocessor and an input and output interface module, wherein the microprocessor is integrated with a program memory unit, a data storage unit and a programming interface and is used for carrying out calculation and comparison on received data; the input and output interface module comprises a digital input interface, a relay output interface and a high-speed counting input interface. The safety protection device has the benefits that the safety blank caused by reaction not in time of most of states of the mechanism when the failure occurs in the control of an existing lifting mechanism is filled up, detection and analysis are performed on an outage state, braking moment and situations in the process of operation, an output signal controls a brake to brake and cut off a power supply when the abnormity occurs so as to ensure the safety of the hoisting mechanism, and the safety protection device is mainly used for realizing multiple protection of the hoisting mechanism, improving the safety level of a crane electrical system and meeting the safety requirements on main and dangerous occasions and is suitable for various hoisting mechanisms with high safety requirements.

Description

technical field [0001] The invention belongs to the field of electrical control and is suitable for cranes for lifting important and dangerous goods, in particular to a safety protection device for a hoisting mechanism of a crane and a protection method thereof. Background technique [0002] Chinese patent ZL200910011399.2 discloses a real-time monitoring method for the hoisting mechanism of a crane. Carry out safety detection and protection, not applicable to lifting mechanisms of other transmission types. [0003] Existing casting crane lifting safety protection devices include: limit limit switch, overspeed switch, overload protection device, etc. When an electrical system failure causes the mechanism to lose control, there are two ways to protect: limit limit switch and overspeed switch. The two protections need to meet the corresponding conditions to work. The limit limit switch only works when the hoisting mechanism reaches the limit position; the overspeed switch onl...

AI Technical Summary

Problems solved by technology

[0002] Chinese patent ZL200910011399.2 discloses a real-time monitoring method for the hoisting mechanism of a crane. Implement safety detection and protection, not suitable for other transmission types of lifting mechanisms

[0005] The hoisting mechanism generally adopts voltage regulation or frequency conversion to control the brake through the brake control point inside the speed regulating device. This control only depends on the speed regulating device. Once the following conditions occur inside the speed regulating device, the mechanism will be out of control , a serious threat to the safety of lifting items and personnel under the aircraft:

[0006] 1. The control board of the speed regulating device itself is faulty, which leads to the confusion of the control program;

[0007] 2. When the brake command is issued, the brake control output point does not act, resulting in the brake not being able to lock the brake as required

[0008] When the above faults occur, the safety protection device fails to work in time, which leads to the occurrence of safety accidents.

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