Electromagnetic sensor for monitoring state of elevator traction steel belt and monitoring method

Abstract

The invention discloses an electromagnetic sensor for monitoring the state of an elevator traction steel belt and a monitoring method. The electromagnetic sensor comprises a magnetic circuit module and a detection module. The magnetic circuit module is composed of an excitation magnetic source, an intermediate magnetic yoke arm, a magnetic yoke beam, and magnetic yoke side arms. The magnetic yokeside arms are distributed on two sides of the intermediate magnetic yoke arm. The magnetic yoke beam is fixedly connected to the intermediate magnetic yoke arm and the magnetic yoke side arms. The excitation magnetic source is set on the intermediate magnetic yoke arm. The detection module is formed by a magnetic flux detection coil, a magneto-dependent sensor, a displacement sensor and a signal processor. The magnetic flux detection coil obtains a magnetic flux signal, the magneto-dependent sensor detects a magnetic leakage signal, the displacement sensor collects a position signal, the signal processor receives the signal and analyzes and processes the signal, therefore, the simultaneous detection and accurate positioning of different types of defects of the elevator traction steel beltare achieved, and at the same time, the electromagnetic coupling efficiency and detection sensitivity are improved.

Description

technical field [0001] The invention relates to the field of state monitoring of elevator traction steel belts, in particular to an electromagnetic sensor and a monitoring method for monitoring the state of elevator traction steel belts. Background technique [0002] The traction steel belt is an important part of the elevator traction system, because the traction steel belt needs to carry the entire weight of the car, personnel and counterweight, and drives the car up and down through the friction with the traction wheel; however, in During the lifting process of the elevator, in addition to normal wear and tear, the traction steel belt often suffers from strength loss, such as external impact, fatigue damage, broken strands, etc., which seriously affect the normal operation of the elevator. Therefore, in order to ensure that the elevator traction steel belt is always in a safe and reliable state, it is necessary to use a suitable non-destructive testing method to monitor t...

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Problems solved by technology

The resistance test method uses DC voltage excitation to obtain the change of the resistance value of the first and last connection of the steel core of the traction steel strip, so as to judge the broken strands of the elevator traction steel strip. However, this method is not only greatly affected by the ambient temperature, but also cannot judge the aging , fatigue damage and other unbroken strand defects

The high-frequency voltage detection method sends high-frequency voltage with a preset frequency to each strand of steel wire rope through the transmitting circuit module, and the receiving circuit module receives the output voltage of each strand of steel wire rope, compares the received power value with the initial value, and judges the compound drag However, this method cannot accurately locate the defect position of the traction steel belt, and the detection accuracy is low, which is prone to missed inspections

The electromagnetic detection method uses the magnetic field disturbance of the standard magnetic source caused by the defect of the traction steel belt, and then obtains the magnetic field strength through the sensor, and performs differential, amplification, and filter processing on the waveform signal, so as to realize the damage detection of the elevator traction steel belt. However, the reference magnetic field source of this method adopts air coupling, the magnetization effect is not ideal, the electromagnetic coupling efficiency is low, and it is still impossible to realize the simultaneous detection of different types of elevator traction steel belt defects and the precise positioning of defects.

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