Fault detection method of elevator entrance and exit protection device

Abstract

The invention discloses a fault detection method for an elevator entrance protector. A fault detection processor is adopted for judging faults. According to the fault detection method, the opening state of elevator doors, the speed of the elevator doors and the output torque of door motors are comprehensively monitored in real time, output signals of the elevator entrance protector are detected in real time, then whether a detection module of the elevator entrance protector is damaged and whether a signal transmission module has disconnection faults or adhesion faults can be judged, and therefore the elevator door motors can be controlled to execute low-speed operation avoiding injury to passengers.

Description

technical field [0001] The invention relates to a fault detection method of an elevator, in particular to a fault detection method of an elevator entrance and exit protection device. Background technique [0002] The elevator car door is automatically opened and closed under the control of the electric drive device. When the elevator car door is in the process of closing, if a passenger enters or exits, there is a risk of being bumped or caught by the door. According to the provisions of 8.7.2.1.1.3 in GB7588-2003 "Safety Code for Elevator Manufacturing and Installation", when passengers are hit or will be hit by the door leaf when they pass the entrance during the closing process of the car door, a protection device should automatically make the door re-open. Open, the effect of this protective device can be eliminated in the last 50mm of travel of each active door leaf. [0003] The elevator entrance and exit protection device is used to detect whether there is an obstacl...

AI Technical Summary

Problems solved by technology

[0004] Due to the cost, the existing elevator entrance and exit protection devices generally do not use contacts with high safety levels as output signal contacts. The output cable breakage and output contact adhesion failure of the elevator entrance and exit protection device itself cannot be solved by the device. By itself, the elevator system cannot judge in real time whether there is an output cable breakage or an output contact adhesion fault in the elevator entrance and exit protection device.

In addition, in order to improve the fault tolerance of the detection module (such as the detection photoeye of the infrared light curtain), when only a small number or a few groups of infrared photoeyes are damaged, the light curtain of the protection device will continue to work, but the damaged photoeye The information cannot be automatically known to the elevator system, and the controller cannot automatically notify the maintenance personnel to repair the light curtain device in time. All of the above may cause harm to passengers entering and leaving the car, and there are hidden dangers in safety

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