RU2036454C1 - Sensor for condition inspection and diagnostics of antifriction bearings - Google Patents

Abstract

FIELD: measurement technology. SUBSTANCE: electric signal of vibrators 1 mounted on rolling friction parts is passed through switch 2, self-normalizing unit 4, high-frequency filter 5, amplitude-frequency response unit 6, peak detector 7, analog-to-digital converter 8, input/output unit 9, and is processed in the form of condition estimate by microprocessor processing unit 10. Information-carrying electric signal picked off output of amplitude-frequency response unit 9 arrives at unit 14 recording maximum amplitude values and is transferred as information about lubricant layer thickness to microprocessor unit 10. The latter also responds to signal informing about rate and rhythm of flaw development coming through second switch 15, low-frequency filter 16, and second analog-to-digital converter 17 and processes it. EFFECT: improved reliability of flaw detection. 3 cl, 1 dwg

Description

 The invention relates to measuring equipment and can be used in testing rolling friction units.

A known device for the diagnosis of rolling bearings, containing serially connected vibration transducers, a switch with a built-in charge preamplifier, a self-feeding unit, a high-pass filter (HPF), controlled by the output voltage, an amplitude-frequency characteristic (AFC) unit, a peak detector, an analog-to-digital converter (ADC) ) and indicator [1]
The disadvantage of this device is the low degree of automation of the process of measuring the state of rolling bearings.

The closest in technical essence to the proposed one is a device containing a series-connected vibration transducers, a switch with a built-in charge preamplifier, a power line voltage blocking filter, an auto-feeding unit, an HPF controlled by the output voltage, an AFC unit, a peak detector, an ADC, an input-output unit and a microprocessor processing unit, a network communication unit connected to the input of the microprocessor processing unit, an indication and control unit connected to the input of the microprocessor processing unit the bays connected in series with the output of the frequency response block, the absolute signal magnitude extraction unit and the maximum amplitude values recording unit connected to the input-output block input, the input-output block input connected to the reset input of the peak detector and the control input of the switch with a built-in charge preamplifier [2]
The disadvantage of this device is the lack of registration of information about the nature of defects at an early stage of failure in the form of data on the defects belonging to a particular bearing element.

 The technical result of the invention is the expansion of recorded information about the nature of damage at an early stage of destruction.

 This is achieved by the fact that the proposed sensor contains series-connected vibration transducers, a switch with a built-in charge preamplifier, a power line voltage filter, an auto-feeding unit, an HPF controlled by the input voltage, an frequency response unit, a peak detector, an ADC, an input-output unit, and a microprocessor processing unit, a network communication unit connected to the input of the microprocessor processing unit, an indication and control unit connected to the input of the microprocessor processing unit, connected in series with by the output of the frequency response block, the absolute signal magnitude separation unit and the maximum amplitude values recording unit connected to the input-output block input, the input-output block input connected to the reset input of the peak detector and the control input of the switch with a built-in charge preamplifier, in addition, the device has a second switch in series connected, a low-pass filter and a second ADC connected to the input-output block input by the output, while the first and second inputs of the second switch are connected respectively o with the input and output of the absolute value allocation unit, and the control input of the second switch is connected to the input-output unit input, the microprocessor unit can be based on a single-chip computer.

 The invention consists in the following.

 At an early stage of failure, the periodicity and frequency rhythm of shock pulses from defects occur at the corresponding frequencies of the relative rotation of the elements of the rolling bearing. The registration of the rhythm and repetition rate of shock pulses gives information about the defect belonging to a specific bearing element, which allows you to more accurately determine the risk of damage (defects) and more accurately plan repair operations.

 The functionality of the proposed sensor can be expanded by changing individual links. So, in order to increase the noise immunity it is necessary to connect the input of the low-pass filter with the output of the absolute signal magnitude isolation unit.

 The drawing shows a structural diagram of the sensor.

 The sensor contains series-connected vibration transducers 1, a switch 2 with a built-in charge preamplifier, a blocking filter 3 of the power supply voltage, a self-rating unit 4, an HPF 5 controlled by the output voltage, a frequency response unit 6, a peak detector 7, an ADC 8, an input-output unit 9, and a microprocessor processing unit 10. The sensor also includes a network communication unit 11 connected to the input of the microprocessor processing unit 10, an indication and control unit 12 connected to the input of the microprocessor processing unit 10, connected in series with the output of the frequency response unit 6, the absolute signal magnitude extraction unit 13, and the maximum recording unit 14 amplitude values, the output connected to the input of the input-output unit 9, connected in series to the second switch 15, the low-pass filter 16 and the second ADC 17, the output connected to the input of the input-output unit 9. The input of the I / O unit 9 is connected to the reset input of the peak detector 7, the control input of the switch 2 with an integrated charge preamplifier, and the control input of the second switch 15. The first and second inputs of the second switch 15 are connected respectively to the input and output of the absolute signal allocation unit 13 .

 The sensor works as follows.

 The electrical signal of the vibration transducers 1, mounted on the housings of the monitored rolling bearings, passes through a switch 2 with a built-in charge preamplifier, a power line voltage filter 3, an autonorming unit 4, an HPF 5 controlled by the output voltage, a frequency response unit 6, a peak detector 7 and is fed to the ADC 8. The latter converts the input signal into a digital code proportional to the maximum damage depth, and transfers it through the input-output unit 9 to the microprocessor processing unit 10. The microprocessor processing unit 10 stores the value of the ADC digital code 8 and translates its value to the display and control unit 12 to display the damage depth and the network communication unit 11 for transmission to a central computer (not shown) for visualization, archiving and calculation of the remaining bearing life.

 Next, the electrical signal from the output of the frequency response unit 6 is rectified in the absolute signal separation unit 13 and fed through the maximum amplitude values recording unit 14, the input-output unit 9 to the microprocessor processing unit 10, which makes it possible to judge the distribution of the dynamic thickness of the lubricant layer in the controlled rolling bearings . Next, the electric signal passes from the output of block 6 of the frequency response, the second switch 15, the low-pass filter 16, the second ADC 17, the input-output block 9, and in the form of a binary code is supplied to the microprocessor processing unit 10, which calculates the rhythm of shock pulses (periodicity).

 Next, the microprocessor processing unit 10 transfers the second switch 15 to the second state and the electric signal is supplied from the output of the absolute signal separation unit 13 through the low-pass filter 16, the second ADC 17, and the input-output unit 9 to the microprocessor processing unit 10. The latter calculates the frequency composition of the shock pulses, which with information about the frequency of the shock pulses allows you to determine the damaged element of the rolling bearing. In addition, the microprocessor processing unit 10 through the I / O unit 9 synchronizes the operation of the switch 2 with the built-in charge preamplifier and peak detector 7.

 The proposed sensor for monitoring and diagnosing the condition of rolling bearings provides registration and processing of the rhythm and the repetition rate of shock pulses from defects, which allows a more detailed assessment of the degree of destruction of the bearing and take measures to repair equipment at an early stage of destruction.

Claims (3)

 1. SENSOR FOR MONITORING AND DIAGNOSTICS OF THE STATUS OF ROLLING BEARINGS, comprising serially connected vibration transducers, a switch with a built-in charge preamplifier, a power line voltage filter, an auto-feeding unit, a high-pass filter controlled by the output voltage, an amplitude-frequency characteristic block, a peak detector, the first analog a digital converter, an input-output unit and a microprocessor processing unit, a network communication unit connected to the input of the microprocessor processing unit, bl to the indication and control, connected to the input of the microprocessor processing unit, in series connected to the output of the amplitude-frequency characteristic block, the unit for extracting the absolute value of the signal and the unit for recording the maximum amplitude values, output connected to the input of the input-output block, while the input of the input-output block is connected with the reset input of the peak detector and the control input of the switch with an integrated charge preamplifier, characterized in that the second switch is connected in series to it, f low-frequency filter and a second amplitude-to-digital converter connected to the input-output unit input by the output, while the first and second inputs of the second switch are connected respectively to the input and output of the absolute value allocation unit, and the control input of the second switch is connected to the input of the input- output.  2. The sensor according to claim 1, characterized in that the microprocessor processing unit is made on the basis of a personal computer.  3. The sensor according to claims 1 and 2, characterized in that the microprocessor processing unit is based on a single-chip computer.