Monitoring method of braking fault of elevating mechanism in crane

Abstract

The invention discloses a monitoring method of a braking fault of an elevating mechanism in a crane. In the method, calculation of a braking time, a braking response time, a braking distance and a braking acceleration are carried out with installation of a braking fault monitoring system on the elevating mechanism in the crane, through detection of rotational speed and the number of rotation of a high-speed shaft or a low-speed shaft of the elevating mechanism, and by means of output of a braking control signal from a braking control circuit to a mechanical brake and output of a time point of a brake feedback signal from a feedback contact in the mechanical brake; and then differences between the four calculation values and a preset hidden danger threshold value, an early warning time threshold value and a fault threshold value are analyzed, thereby obtaining brake early warning or brake protection signals. The monitoring method can not only achieve early warning of a fault hidden danger of the brake system and protection of the fault, which is beneficial to elimination of the fault within an earlier stage for avoiding accidences; but also being beneficial for maintainers to quickly detect the fault with cooperation of positioning a fault point, thereby reducing a maintaining time.

Description

technical field [0001] The invention relates to a monitoring method for a braking failure of a lifting mechanism of a crane, belonging to the technical field of crane safety protection. Background technique [0002] For the lifting mechanism of the crane, the braking system (including the braking control circuit and the mechanical brake) is the most critical link to ensure its safe operation. Stop running in time to avoid accidents or reduce accidents, so it is extremely important to ensure the normal operation of the braking system. [0003] The braking system of a typical crane lifting mechanism includes a braking control circuit and a mechanical brake. If there is a fault in the brake control circuit, such as the contactor is stuck or the action is slow, or there is a fault in the mechanical brake itself, such as excessive wear of the brake pad, improper tightening of the mechanical brake, or lack of oil in the hydraulic pump, etc., it will cause slow braking or braking....

AI Technical Summary

Problems solved by technology

If there is a fault in the brake control circuit, such as the contactor is stuck or the action is slow, or there is a fault in the mechanical brake itself, such as excessive wear of the brake pad, improper tightening of the mechanical brake, or lack of oil in the hydraulic pump, etc., it will cause slow braking or braking. Insufficient torque, so as to cause slip hook accident

[0004] Existing methods all only measure the amount of brake slippage, such as the technologies disclosed in Chinese patent application documents CN102679886A, CN101226110A and Chinese patent authorization documents CN201803668U, CN202956100U; The real-time monitoring of hidden troubles in the system cannot realize the early warning of hidden troubles in braking, so as to eliminate hidden troubles in the bud and avoid the occurrence of failures

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