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Detection circuit and carrier signal demodulation method of on-line monitor for lubricating oil and metal chips

A technology for detecting circuits and carrier signals, applied in the field of detection, can solve the problems of overlapping signals and inaccurate identification, and achieve the effects of unique and efficient demodulation method, ingenious and reasonable circuit structure, and good versatility

Active Publication Date: 2018-09-18
AVIC BEIJING CHANGCHENG AVIATION MEASUREMENT & CONTROL TECH INST +2
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

The current signal acquisition circuit scheme only detects the different phases of a single carrier signal without distinguishing them, which leads to the mutual influence of the two types of signals when they overlap, and the identification is inaccurate

Method used

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  • Detection circuit and carrier signal demodulation method of on-line monitor for lubricating oil and metal chips
  • Detection circuit and carrier signal demodulation method of on-line monitor for lubricating oil and metal chips
  • Detection circuit and carrier signal demodulation method of on-line monitor for lubricating oil and metal chips

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Embodiment Construction

[0016] Further elaborate the present invention below in conjunction with specific implementation case

[0017] see figure 2 , the detection device includes an excitation coil and an induction coil. After the timing controller U2 in the circuit is programmed, one of the excitation pins of the timing controller U2 generates a square wave with a fixed frequency H and a fixed pulse width T, and the two control pins Generate two channels with the same frequency H and different pulse width T 1、 T 2 square wave; the square wave input excitation circuit generated by the excitation pin of the controller U2, for details, see image 3 , the square wave is processed by the transistors T1, T2 and T3 to realize the conduction and shutdown of the field effect transistor T4, and the similar square wave signal output by the field effect transistor T4 acts on the resonant circuit in the lubricating oil metal chip detection device to generate The fixed-frequency sine wave AC excitation signa...

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Abstract

The invention belongs to the technical field of detection and relates to a detection circuit of a grease metal filing online monitor and a carrier signal demodulation method. The circuit comprises an exciting circuit, a logic time sequence adjusting and control circuit, an amplification demodulation circuit, an analog-to-digital conversion circuit, a digital signal processing circuit, a communication circuit and a power source circuit. The whole circuit is ingenious and reasonable in structure, and has the function of accurately amplifying carrier signals, and thus the function of recognizing the size of small metal filing can be achieved. The unique carrier signal demodulation method is formed through the method of combining a time sequence controller with a switching device, ferromagnetic metal filing signals and nonferromagnetic metal filing signals can be accurately separated and recognized, and thus the grease metal filing is comprehensively detected on the aspects of sizes, counting and types; thus, equipment operation information of a grease system can be accurately obtained, faults of equipment can be analyzed and predicted, the causes, types and positions of the faults are further determined, and good universality is achieved.

Description

technical field [0001] The invention belongs to the technical field of detection, and relates to a detection circuit and a carrier signal demodulation method of an on-line monitor for lubricating oil and metal chips. Background technique [0002] Lubricating oil metal scrap detection technology is to analyze and predict the failure of the equipment by analyzing the status of the metal scrap in the lubricating oil of the monitored operating equipment, so as to obtain the equipment operation information, to analyze and predict the failure of the equipment, and to determine the cause, type and location of the failure. [0003] The magnetoelectric lubricating oil and metal dust on-line monitoring sensor developed for the ferromagnetic characteristics of wear metal dust is a relatively successful one. It is based on the principle of using the disturbance generated by the metal scraps when the oil flows through the area to be detected with a magnetic field of the sensor, so that t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/74
Inventor 郑立安王燕山张梅菊张宏祥王立清商薇
Owner AVIC BEIJING CHANGCHENG AVIATION MEASUREMENT & CONTROL TECH INST
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