Methods of preventing accidental movement of the elevator car

Abstract

The invention relates to a method for preventing accidental movement of an elevator cage. The method comprises the following steps: A, a control cabinet controls an elevator door lock to open; B, an elevator door opening mechanism controls an elevator door to open; C, the control cabinet controls the elevator door opening mechanism to close the elevator door, the door opening mechanism transmits a door close in-place signal to the control cabinet after the elevator door is closed, and the elevator enters an alarm state if the control cabinet receives an elevator door lock closing signal before the door close in-place signal; D, the control cabinet controls an executing mechanism to close the elevator door lock; E, the control cabinet controls a brake motor to start and transfers rotary torque to a brake; F, the brake examination module examines whether an encoder generates a signal, and the elevator enters the alarm state. Each time when the elevator is started, the working condition of the elevator door lock and the brake force of the brake are examined one by one, the elevator is stopped and an alarm is sent immediately after abnormity of the elevator door lock and the brake is discovered, and the serious accident of shearing or falling of the elevator is substantially avoided.

Description

technical field [0001] The invention relates to an elevator control system, in particular to a method for preventing accidental movement of an elevator car by detecting in real time whether the elevator door locks and brakes are working normally. Background technique [0002] Because the balance between the traction elevator car and the counterweight is accidental, the unbalance is absolute. When the gravity overcomes the braking force, the elevator car may move. Serious accidents of shearing or falling may occur. There are two reasons for the occurrence of the above-mentioned vicious accidents. One is that the door lock is artificially blocked, that is, because the elevator door lock is blocked, the elevator cannot be driven. In order to find the fault, the maintenance worker artificially short-circuits the door lock. , but sometimes neglected. [0003] The second is that the braking force of the brake is insufficient. Elevator is a vertical means of transportation, and ...

AI Technical Summary

Problems solved by technology

But the brake is an electromechanical device. Its principle is that the brake shoe brakes on the brake drum under the action of the brake spring. Every time the elevator starts, the brake will act. The spring may be fatigued, and the brake mutual and the brake drum may be worn. Oil stains, corrosion and jamming of connecting parts, heating of electrical components, etc. will weaken the braking force, the brake cannot be locked, and the elevator can still continue to run, which may easily lead to a dangerous situation of slipping