Research On Lubricant Liquid Metal Debris Sensor

During the normal operation of mechanical equipment,various parts will wear out due to mutual friction.As an important lubricating reagent in mechanical equipment,lubricating oil has important functions such as lubrication,cooling,sealing,rust prevention and oxidation resistance,and is widely used in various mechanical industrial equipment.During the operation of the equipment,with the increase of the number of uses,metal debris is gradually generated.These debris will enter the lubricating oil,which will cause pollution and affect the lubrication performance,on the other hand,it will aggravate the friction loss of the equipment.Therefore,the detection and analysis of these metal abrasive pollutants is of great significance to the diagnosis and prevention of mechanical equipment failures.According to the degree of wear of the metal abrasive particles,the working state of the friction pair of the equipment can be inferred,realize real-time monitoring and fault warning,and extend the service life of the equipment.This article aims to design an inductive metal wear particle sensor,which is used to monitor the characteristic information of metal abrasive particles in the lubricating oil in real time.Based on the principle of electromagnetic induction,study the magnetization of different types and sizes of metal abrasive particles in the lubricating oil in the electromagnetic coil,convert the inductance change signal of the magnetic field strength into a frequency change signal that is easy to capture and analyze,and deduce the corresponding relationship between the frequency change rate and the size of metal abrasive particles,and realize the function of online detection of the wear status of mechanical equipment.First,introduce technical background and current research status at home and abroad,the research goal is to develop an online detection sensor with higher detection accuracy and wider detection range.Then analyze the wear mechanism of mechanical equipment,the degree of wear represented by different metal abrasive particle forms,and further determine the detection accuracy range of the sensor,design a multi-channel metal particle sensor with a symmetrical solenoid structure as the core,and derive the calculation formula of the magnetic induction intensity inside the solenoid coil.Then build a model in the magnetic field according to the designed sensor structure for simulation,static simulation analyzes the distribution law of the magnetic field inside the coil,transient simulation analyzes the influence of the type and size of metal abrasive particles on the magnetic induction intensity of the coil,calculate the corresponding inductance change rate and frequency change rate based on the previous theoretical formula.In addition,select the appropriate detection circuit,build a data acquisition and signal processing system,convert the inductance signal of the sensor detection circuit into a frequency signal and input the frequency counter to save the data.Finally,set up a test bench,test the frequency changes caused by different types and sizes of metal abrasive particles and the frequency response of metal abrasive particles moving in different paths and at different speeds,compare simulation results and analyze errors,and verify the feasibility and detection accuracy of the sensor.Summarize the corresponding relationship between the size of metal abrasive particles and the frequency change rate,infer the degree of wear of mechanical equipment,accurately locate the location and type of wear components,and realize monitoring and prevention.