A method for early warning of faults in the braking system of an elevator in use

Abstract

The invention provides an early fault warning method for an in-use elevator brake system. The in-use elevator brake system comprises a traction machine and a brake arm. The early fault warning method comprises the steps as follows: two groups of data signals respectively corresponding to a pre-tightening force sensor and a brake arm stroke sensor on the traction machine are obtained; whether the in-use elevator brake system has a fault is determined according to the two groups of data signals; and if the system has the fault, an early-warning signal is sent out according to the fault type represented by the two groups of data signals. According to the embodiment of the invention, the use states of the traction machine and the brake arm of an in-use elevator can be evaluated in real time, and effective early fault warning can be effectively performed.

Description

technical field [0001] The invention relates to the technical field of elevator detection, in particular to a fault early warning method for a braking system of an elevator in use. Background technique [0002] As an extremely important part of the elevator system, the traction machine has been paid more and more attention to its reliability. Through the investigation of the existing traction machine brake failures, the main failure modes of the traction machine brake are: poor holding brake, holding The brake is stuck, and the braking torque is insufficient after the brake is applied. Among them, the brake is not smooth, including insufficient pre-tightening force and asynchronous action of the bilateral brake arms. Furthermore, insufficient pre-tightening force leads to insufficient braking friction, resulting in the elevator slipping or rushing to the top. The brake jamming will cause the brake mechanism to fail to open and close in time. In severe cases, the elevator wi...

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Problems solved by technology

Furthermore, insufficient pre-tightening force leads to insufficient braking friction, resulting in elevator slipping or rushing to the top. The brake jamming will cause the brake mechanism to fail to open and close in time. In severe cases, the elevator will slip or rush to the top, and the brake The asynchronous movement of the boom will cause the braking force that should be provided by the brake shoes on both sides to be provided by one side for a period of time

Due to improper maintenance of the traction machine brake or other reasons, oil dirt or other substances are mixed between the brake shoe and the traction wheel, and the friction coefficient of the brake shoe becomes smaller, resulting in friction between the brake shoe and the traction wheel Insufficient force, further resulting in insufficient braking torque after the brake

Through the above analysis, the inventor found that the prior art still cannot provide effective fault warning when the elevator in use fails.

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