Electrical protection method and device during frequency-changing elevator mechanical brake disabling

Abstract

An electric protective method and a device when a mechanical brake of a frequency conversion elevator fails is characterized in that an elevator controller real time monitors the displacement and the speed of an elevator car, and can immediately judge the mechanical brake of the elevator fails and the elevator slips if any unallowable displacement and certain moving speed are found to the elevator car before the elevator controller makes any direction and speed instruction. At this time, the invention can immediately send the zero-speed running signal to a frequency converter, and use the frequency converter to control the zero-speed torque moment produced by dragging a motor to brake the elevator car to stop, so as to ensure the safety of the people going in and out of the elevator car; meanwhile, gives out the alarm signal to notify the people in the elevator car to quickly leave, and then controls to close the door. In case of any irreversible failure to the mechanical brake, the invention controls the elevator car to run at lower speed in the slipping direction, until the elevator runs to an extreme position and stops. In this way, the invention can prevent severe accidents of shearing injury to people and high-speed crash because of high-speed slipping of the elevator.

Description

【Technical field】 [0001] The present invention relates to an elevator device, in particular to an elevator protection device, in particular to an electrical protection method and device for frequency conversion elevator mechanical brake failure. 【Background technique】 [0002] Elevators are the most widely used vertical transportation means. Most of the present elevators adopt mechanical brakes as a measure to prevent the elevator car from continuing to be displaced after the elevator stops, so as to ensure the safety of passengers entering and leaving the elevator car. For a traction elevator, the traction wheel hangs the elevator car on one side through the steel wire rope, and the counterweight is suspended on the other side. Under normal circumstances, the elevator drives the traction wheel through the motor and drives the elevator car by the friction between the traction wheel groove and the steel wire rope. The car runs up and down. After the elevator stops, the tract...

AI Technical Summary

Problems solved by technology

Once the mechanical brake of the elevator fails due to unexpected events such as jamming, the traction sheave will passively rotate due to the weight difference between the counterweight side and the car side, and the elevator car will also undergo uncontrolled displacement (commonly known as slipping), and the slipping The speed will become faster and faster, and it will cause major accidents of personal injury and equipment damage

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