Control method of elevator speed limiter

Abstract

The invention discloses a control method of an elevator speed limiter. The control method is characterized in that when the moving speed of an elevator cage is up to 115 percent of the rated speed of an elevator, a measurement and control unit outputs a first speed limitation control signal serving as an emergency stop control signal of an elevator main control system; when the moving speed of the elevator cage is up to 120 percent of the rated speed of the elevator, the measurement and control unit outputs a second speed limitation control signal serving as a start signal of a stepping motor; the stepping motor drives a pawl to rotate a set angle and then drives a rope pressing block through a ratchet wheel, so that the rope pressing block rotates to lock a steel wire rope in a clamping way together with a speed limiter wheel disc; and the measurement and control unit outputs a resetting signal after a fault is solved to enable the stepping motor to rotate anticlockwise and drive the pawl to be released from the ratchet wheel to realize resetting. The speed limitation structure is simple, and the control method is reliable in operation.

Description

[0001] This application is a divisional application with the application date of 20150203, the application number of 2015100566428, the title of the invention is an elevator speed limiter and its control method, and the applicant is Hefei University of Technology. technical field [0002] The invention relates to a control method of an elevator speed governor. Background technique [0003] Elevators are means of transportation that run vertically in space, and the reliable operation of elevators is crucial to the safety of passengers and goods. The main component that controls the safe operation of the elevator within the rated speed is the speed limiter of the elevator. The speed limiter is a necessary safety guarantee component for every elevator. When the elevator runs out of control at overspeed, for example, when the traction wire rope breaks or the elevator control system fails, the speed limiter should act immediately to send an emergency stop signal, and drive the wi...

AI Technical Summary

Problems solved by technology

[0005] 1. The mechanical structure is complex and the movement speed is not precise, so it can only be adjusted within a certain speed range

[0006] 2. The action speed needs to be checked regularly, otherwise reliable triggering cannot be guaranteed

The temperature, humidity, dust and corrosive gas of the environment where the elevator is used may reduce the mechanical action speed of the speed limiter or even cause the mechanism to rust, and the spring will also be fatigued due to stretching and compression. The speed of the accelerator slows down

When the elevator runs at overspeed, the braking lags or even fails, which may cause personal accidents or property losses. Therefore, it is necessary to regularly use special instruments to check the action speed of the mechanical elevator speed limiter. Heavy workload, cumbersome operation and low accuracy

[0007] 3. After the speed limiter produces a speed limit action, it is necessary to manually reset the emergency stop switch and the mechanical trigger mechanism, which increases the complexity of maintenance

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