Device and method for detecting broken strands of hoisting steel wire rope

Abstract

The invention discloses a device for detecting broken strands of a hoisting steel wire rope. The detection device comprises a tension detection element and a control unit; the tension detection element is used for detecting the tension of the steel wire rope; the tension detection element feeds the detected steel wire rope tension signals back to the control unit for processing; and for the same steel wire rope, when the subtraction value of the tension detected in the first time and the tension detected in the second time is larger than or equal to 50%, the strands of the steel wire rope is judged to be broken. The invention further discloses a method for detecting the broken strands of the hoisting steel wire rope. The device and the method provided by the invention have the advantages that a conventional pressure sensor or a steel wire rope tension gauge and a lift control cabinet microcomputer circuit board are adopted, so that the manufacture process is mature and the cost is low; and a failure can be judged accurately, the reaction speed is high, and passenger safety can be better protected.

Description

【Technical field】 [0001] The invention relates to the field of elevators, in particular to a device and method for detecting a broken strand of a traction steel wire rope that can satisfy the emergency operation requirements of a traction type elevator for strand breakage of a steel wire rope and ensure safety. 【Background technique】 [0002] If the elevator continues to run after the wire rope of the traction elevator is broken, it may cause the following consequences: [0003] (1) The wire rope is broken; [0004] (2) After the broken strands are scattered, they are entangled with the adjacent steel wire rope and knotted together, causing the steel wire rope to slip on the sheave, and the car stops on the non-level floor to trap people, and because of the entanglement of the steel wire rope, it is impossible to turn the car to rescue people; [0005] (3) Continued operation of broken strands on the sheave will also accelerate the wear of the rope groove, shortening the se...

AI Technical Summary

Problems solved by technology

[0003] (1) The wire rope is broken;

[0004] (2) After the broken strands are scattered, they are entangled with the adjacent steel wire rope and knotted together, causing the steel wire rope to slip on the sheave, and the car stops on the non-level floor to trap people, and because of the entanglement of the steel wire rope, it is impossible to turn the car to rescue people;

[0005] (3) The continued operation of broken strands on the sheave will also accelerate the wear of the rope groove, shortening the service life of the sheave

However, there are two obvious defects in the above device: 1) If the broken strand does not occur in the detection range of the photoelectric sensor, the broken strand will not stop immediately, and the traction wire rope will continue to run after the broken strand occurs, until the broken strand enters the photoelectric sensor. In the detection interval of the sensor, the traction machine will stop after outputting an abnormal electrical signal

The steel wire rope has already run for a certain period of time during the process from strand breakage to shutdown, and the broken strands may be entangled with adjacent steel wire ropes and knotted together, causing the car to stop on an uneven floor and trap people; 2) The wire rope is running If the precipitation of lubricating oil is relatively serious, after adhering to impurities such as shafts and machine room dust, a covering layer will be formed on the partial surface of the steel wire rope, which will have a difference in the reflection intensity of infrared signals from the normal surface of the steel wire rope, and output abnormal electrical signals, resulting in false alarms and shutdowns

[0007] Since there is no effective device, most traction elevators do not monitor the broken strands of the wire rope

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