Emergency protective device for elevator car

Abstract

The invention discloses an emergency protective device for an elevator car. The emergency protective device for the elevator car comprises a car buffer, a counterweight buffer, a safety switch, a first trigger, a second trigger and a speed detection assembly, wherein the speed detection assembly can be used for detecting operation speed of the car and / or a counterweight unit; when the car is positioned at or higher than the position of the first trigger or is positioned at or lower than the position of the second trigger, the first trigger / the second trigger triggers the safety switch to open; the speed detection assembly is used for detecting operation speed of the car and / or the counterweight unit; when the operation speed exceeds speed set by a control system, the control system controls a drive main engine brake to act, so that the speed generated when the car / the counterweight unit is in contact with and hits against the car buffer / the counterweight buffer is lower than the set impact speed. When an elevator has an emergency condition, the emergency protective device can effectively protect the car / counterweight unit, so that the occurrence of a safety accident is prevented, and the possibility that elevator components are damaged is also reduced.

Description

technical field [0001] The invention relates to the technical field of elevators, in particular to an elevator car emergency protection device. Background technique [0002] Currently, existing elevators include a car that can move up and down and a counterweight unit that counterweights the car. In order to ensure the safety of the elevator, buffers are respectively arranged at the bottom of the pit under the car and the counterweight unit. When the elevator is out of control, when the car rushes to the top, the counterweight unit goes down and hits the buffer, or when the car hits the bottom, the car hits the buffer. The buffer buffers the travel of the car / counterweight unit to slow down the speed of the car / counterweight unit, reducing the safety accidents and damage to the elevator caused by the hard landing of the car / counterweight unit. It can be said that the buffer is the last safety guarantee for equipment and elevator personnel. Generally, the selection of the ...

AI Technical Summary

Problems solved by technology

[0003] In architectural design, often due to the insufficient height of the top of the elevator shaft or the insufficient depth of the pit, the space required by the buffer cannot be satisfied. At this time, only a buffer lower than the rated speed of the elevator can be selected, so that the stroke of the buffer can adapt to the elevator shaft. out of space condition

When the elevator encounters an emergency situation such as out of control, the car or the counterweight unit accelerates and falls and hits the buffer. Due to the reduction in the rated speed and stroke of the buffer, the buffer cannot give the car or the counterweight unit enough buffer travel, making The car or the counterweight unit may land hard and cause safety accidents, and the elevator will be seriously damaged as a result.

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