Anti-interference coal mine electromechanical equipment start-stop detection method

Abstract

The invention relates to an anti-interference coal mine electromechanical equipment start-stop detection method, which comprises the following steps of installing two or more magnetoresistance chips outside a cable, and calculating a magnetic field value of any point of the cable according to parameters R and r of the cable, current IA, IB and IC values of the cable and an installation angle of the magnetoresistance chip, and determining the relationship between the magnetic field value and the current of the cable through the magnetic field vector sum of each magnetoresistance chip. Accordingto the anti-interference coal mine electromechanical equipment start-stop detection method, magnetic field distribution around the three-phase cable is analyzed theoretically, magnetic flux leakage around the cable is detected through the magnetoresistance chip, effective detection of the magnetic flux leakage of the cable is ensured in combination with a related algorithm, and misjudgment causedby magnetic field offset at a certain position is prevented; and a magnetic shielding structure is designed, so that the magnetoresistance chip is prevented from being interfered by a surrounding magnetic field, and the stability and reliability of equipment start-stop detection are effectively improved.

Description

Technical field: [0001] The invention relates to the technical field of coal mine monitoring, in particular to an anti-interference type coal mine electromechanical equipment start-stop detection method. Background technique: [0002] The start-stop sensor is used to monitor the start-stop status of underground electromechanical equipment in coal mines, which plays a very important role in ensuring underground production efficiency, personnel safety and utilization of electromechanical equipment. At present, most start-stop sensors at home and abroad use coils to induce magnetic field strength to judge the working status of the equipment. Due to the large differences in coil probes, they cannot quantitatively reflect the relationship between the magnitude of the current in the cable and the magnetic field, so it cannot be a good guide Adjustment of the start-stop threshold. However, the downhole cable has an armor layer, which will attenuate the magnetic field to a certain ...

AI Technical Summary

Problems solved by technology

Magnetic sensors with Hall elements as sensitive elements usually use a magnetic gathering ring structure to amplify the magnetic field and increase the output sensitivity of the Hall, thereby increasing the volume and weight of the sensor. At the same time, the Hall element has the defects of large power consumption and poor linearity

The sensitivity of the AMR element is much higher than that of the Hall element, but its linear range is narrow

Magnetic sensors with GMR elements as sensitive elements have higher sensitivity than Hall current sensors, but their resolution is lower

TMR has higher sensitivity, wider linear range, but more expensive

[0004] In addition, the underground cables of coal mines are complex and have great interference, and the start-stop sensor is susceptible to external interference and occasional misjudgment, which seriously affects the safe production and maintenance costs of underground coal mines.

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