On-line abrasive particle monitoring method and monitoring sensor based on bilateral symmetric structure of the radial magnetic field

Abstract

The invention discloses an on-line abrasive particle monitoring method and a monitoring sensor based on bilateral symmetric structure of the radial magnetic field. Symmetrical magnetic loop as the excitation source is arranged on both sides of an oil pipe of oil equipment; the magnetic field on both sides are superimposed on the oil pipe, and act on the pipe along a radial direction; at the same time, a detection coil is provided, so that when the abrasive particles pass through the magnetic loop, the magnetic flux in the magnetic loop changes; the change of magnetic flux leads to the change of the detection voltage in the detection coil, and then the detection coil outputs real-time self induction voltage signal; the voltage signal output by the detection coil is amplified by an amplifying circuit, and common-mode signal suppression and different-mode signal amplification are carried out; and then subsequent analysis process is conducted to obtain abrasive particle information. The invention has the advantages that the bilateral symmetrical structure can guarantee the magnetic loop to use the oil pipe as the symmetrical center, so that the magnetic field traversing the oil pipe is more uniform and more symmetrical; and the magnetic field strength can be increased, and the sensitivity of the sensor can be improved.

Description

Technical field [0001] The invention belongs to the technical field of hydraulic system state monitoring, fault diagnosis and life prediction, and specifically relates to an online wear particle monitoring sensor based on a radial magnetic field and a monitoring method thereof. Background technique [0002] Studies have shown that wear will greatly affect the reliability and service life of hydraulic equipment. Wear can cause huge economic losses. About 80% of mechanical failures are directly related to wear, and abrasive wear is the main reason. In mines, coal, construction and transportation machinery, wear and tear will bring huge economic losses. After a lot of actual investigations, it is found that the main cause of equipment wear is caused by solid particles in the oil. If the real-time detection, recording and data processing of the oil status are carried out on the equipment that uses the oil, and the operating conditions of the mechanical equipment are judged from thi...

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Problems solved by technology

[0007] (3) In the stage of rapid wear, due to the influence of factors such as a sharp increase in temperature and changes in metal structure, the resulting gap is too large and the lubricating oil film is easily damaged

The coil is directly wound on the oil pipe, which must be fixed and installed, w

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