A series resonance oil metal particle measuring device and its measuring method

Abstract

The invention discloses a series resonance oil metal particle measuring device and a measuring method thereof. The measuring device comprises: a cavity for the oil to be measured to flow through; and an inductance coil distributed around the cavity inner wall Respectively connected with the two lead ends of the inductance coil and the capacitor; the inductance coil, the resistor and the capacitor form an RLC series resonant circuit; the excitation signal source; the excitation signal source can produce alternating voltage signals of different frequencies, the An AC voltage signal is applied to both ends of the RLC series resonant circuit as an excitation signal; and it is connected to the series branch composed of the inductance coil and the capacitor, and is used to obtain an acquisition module for electrical signals at both ends of the series branch; The invention can monitor the pollution degree of oil metal particles in mechanical equipment such as hydraulic systems and lubrication systems in real time, and realizes accurate measurement of the number, particle size and concentration state of metal particles in the oil to be tested.

Description

technical field [0001] The invention belongs to the technical field of oil liquid monitoring, in particular to a series resonance type oil liquid metal particle measuring device and a measuring method thereof. Background technique [0002] The hydraulic system is used in civil and military industries, especially in ship machinery, mining machinery, and aviation industry, due to its small size, light weight, infinitely variable speed and overload protection, sensitive response, easy remote control, and long life. Hydraulic systems are used in a wide variety of applications. Hydraulic oil is the key working fluid of the hydraulic system. It can transmit energy, reduce wear and failure between friction pairs, reduce the temperature rise of the hydraulic system, and prolong the service life of mechanical equipment. Therefore, hydraulic oil pollution is the main cause of hydraulic system failures. Statistics show that more than 75% of hydraulic system failures are caused by soli...

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Problems solved by technology

[0003] The oil detection methods of mechanical equipment such as hydraulic systems and lubrication systems in the prior art have the following problems: the detection period is long, the detection equipment is complicated and expensive, and the detection accuracy is not high due to the influence of many factors Realize online detection, etc.; the applicant found that: under the normal working conditions of mechanical equipment, the wear pollutants in hydraulic oil have a constant concentration and small particle size, and the particle size of metal abrasive particles is usually 1-20 μm. During abnormal wear, the particle size of metal abrasive particles will become as high as 50-100 μm. These metal abrasive particles are basically produced by the wear between friction pairs of hydraulic components. They contain a lot of tribological information, such as the metal abrasive particles. From these tribological information, we can judge important information such as the wear part and degree of wear of mechanical equipment. Therefore, the number, size and concentration of metal particles in hydraulic fluid can be accurately and effectively detected , which is of great significance to the fault diagnosis and fault prediction of hydraulic system and lubrication system mechanical equipment

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