Brake failure protection method, device and system and crane

Abstract

The invention relates to the technical field of engineering machines, and discloses a brake failure protection method, device and system and a crane. The protection system comprises a lifting motor, a lifting movement given circuit, a lifting movement detection circuit, a controller and a lifting movement control circuit, wherein the lifting movement given circuit is used for outputting lifting movement given signals; the lifting movement detection circuit is used for detecting and outputting lifting movement operating signals; the controller is used for outputting lifting movement protection signals when the lifting movement given signals are not acquired, but the lifting movement operating signals are acquired; the lifting movement control circuit is used for starting the lifting motor to move according to set gears according to the lifting movement protection signals. By the adoption of the technical scheme, when the lifting movement given signals are not acquired, but the lifting movement operating signals are acquired, it shows that a brake fails and the hook slipping phenomenon occurs, the lifting motor is started to move according to the set gears, and reliability of equipment is greatly improved.

Description

technical field [0001] The invention relates to the technical field of engineering machinery, in particular to a brake failure protection method, a protection device, a protection system and a crane. Background technique [0002] A crane refers to a multi-action hoisting machine that vertically lifts and horizontally transports heavy objects within a certain range, also known as a crane. During the actual operation of the crane, when the heavy object to be hoisted is hovering in the air, the brake must be activated. If the brake fails, the hook slip phenomenon will occur, causing the heavy object to be hoisted to drag the lifting hook down, seriously It affects the reliable operation of the system and also threatens the safety of on-site personnel. [0003] Most of the brakes of existing cranes adopt a mechanical structure, and are used as the final protection means to prevent the hook from slipping, and the problem of the hook slipping caused by the failure of the brake is...

AI Technical Summary

Problems solved by technology

During the actual operation of the crane, when the heavy object to be hoisted is hovering in the air, the brake must be activated. If the brake fails, the hook slip phenomenon will occur, causing the heavy object to be hoisted to drag the lifting hook down, seriously Affects the reliable operation of the system and also threatens the safety of on-site personnel

[0003] Most of the brakes of existing cranes adopt a mechanical structure, and are used as the final protection method to prevent the hook from slipping, and the problem of the hook slipping caused by the failure of the brake is not considered

Some technical solutions use a mechanical protector on the transmission shaft of the crane to prevent the hook from slipping, but complex mechanical devices need to be added, and this kind of brake generally uses friction braking. When the heavy load is heavy, it will still appear. Slip hook phenomenon, low reliability

Images