RU2036455C1 - Sensor for diagnostics of rolling friction parts - Google Patents

Abstract

FIELD: measurement technology. SUBSTANCE: electric signal of vibrators 1 mounted on rolling friction parts is passed through self-normalizing unit 4, high-frequency filter 5, amplitude-frequency response unit 6, peak detector 7, signal extremum data recording unit 12, average absolute value detector 13, low-frequency filter 14 and, arrives via second switch 8, analog-to-digital converter unit 9, and input/output unit 10 to microprocessor processing unit 11. The latter indicates and translates digital data on degree of fracture, distribution of lubricant thickness in defective region and on bearing member where flaws are detected to display unit 15 and computer network. Electric signal of vibrators 1 also goes through signal level detector 20, 21, second-low-frequency filter 22. EFFECT: provision for self-inspection of device. 3 cl, 1 dwg

Description

 The invention relates to measuring technique and can be used in testing rolling bearings.

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) block, a peak detector, an analog-to-digital converter (ADC) block ) and indicator [1]
The disadvantage of this device is the lack of memory when displaying the rate of destruction of bearings, which does not allow to calculate their residual life.

The closest in technical essence to the proposed one is a device for diagnosing rolling friction units, which contains serially connected vibration transducers, a switch with a built-in charge preamplifier, a power line voltage filter, an auto-feeding unit, an HPF, an frequency response unit, a peak detector, an ADC unit, an input-output unit, and a microprocessor processing unit, a network communication unit, an indication unit and a control unit connected to the input of the microprocessor processing unit, as well as connected to the output of the frequency response unit recording information about the extremes of the signal, the output connected to the input of the input-output unit, and a series-connected average absolute value detector and low-pass filter (LPF), while the input of the input-output unit is connected to the control inputs of the switch with a built-in charge preamplifier, auto-feeding unit, HPF block and peak detector, as well as the first and second signal level detectors, inputs connected respectively to the output of the auto-feeding unit and the HPF output, the second LPF connected to the switch output ra with integrated preamplifier charge unit reference voltage source unit microswitches number of channels involved and the sensor serial number, the signaling block of the equipment included in the input unit IO [2]
The disadvantage of this device is the narrow functionality for recording the nature of damage and self-diagnosis.

 The technical result of the invention is to expand the functionality of the device.

 This is achieved by the fact that a second switch with combined scale amplifiers is connected between the output of the peak detector and the input of the ADC unit, the second input of the second switch connected to the output of the first signal level detector, the third input of the second switch connected to the output of the second level detector signal, the fourth and fifth inputs of the second switch are connected respectively to the outputs of the low-pass filter and the second low-pass filter, and the sixth input of the second switch is connected to the output of the block of reference voltage sources nings.

 The microprocessor processing unit can be made on the basis of a single-chip computer, and the input-output unit is made distributed according to functionally complete electrical circuits.

 The invention consists in the following.

 Shock pulses of vibration carry information on the dynamic thickness of the lubricant layer and their frequency (frequency composition after the Hilbert transducer), indicate that defects belong to certain bearing elements, which makes it possible to judge additionally the quality of the lubricant, the “volume” of damage and their severity (for example, an internal burst ring), improve the quality of control by expanding the functionality of the diagnostic device. The issues of self-diagnosis of a device operating in harsh industrial conditions are of great practical importance. So, accurate information on the state of cable products from vibration transducers (short circuit or open circuit) is required, which is set by a constant signal at the output of the switch and the control code of the autororming unit. In addition, in order to improve accuracy, digital control of the HPF unit is performed and information on the operation of equipment (machines) is processed.

 Qualitative characteristics of the device can be expanded by changing the composition of the bonds. In order to simplify the device, the auto-normalization unit may not be connected to the input of the input-output unit, and the input of the signal extremum information recording unit may be connected to the output of the average absolute value detector.

 The drawing shows a structural diagram of the proposed sensor.

 The diagnostic sensor for rolling friction assemblies contains serially connected vibration transducers 1, a switch 2 with a built-in charge preamplifier, a blocking filter 3 of the mains voltage and an autonorming unit 4, an HPF 5, a frequency response unit 6, a peak detector 7, a second switch 8 with combined scale amplifiers, unit 9 The ADC, the input-output unit 10 and the microprocessor processing unit 11. The sensor also includes a signal extremum information recording unit 12 connected to the output of the frequency response unit 6, output connected to an input of an input-output unit 10, and a series 13 average absolute value detector and a low-pass filter 14 connected to a fourth input of the second switch 8. In addition, , the sensor contains a display unit 15, a network communication unit 16 and a control unit 17, inputs connected to the input of the microprocessor processing unit 11, the microswitch unit 18 of the number of channels involved and the serial number with the sensor and the signaling unit 19 about the operation of the equipment, connected to the input of the input-output block 10, the first 20 and second 21 signal level detectors, connected by inputs to the output of the auto-blocking unit 4 and the output of the high-pass filter 5, outputs connected respectively to the second and third inputs of the second switch 6, the second low-pass filter 22, connected between the output of the switch 2 and the fifth input of the second switch 8, the block 23 of the voltage reference sources, the output connected to the sixth input of the second switch 8.

 In this case, the input of the input-output block 10 is connected to the control inputs of the switch 2, auto-blocking unit 4, high-pass filter 5, peak detector 7, and the second switch 8.

 The device operates as follows.

 The electrical signal of vibration transducers 1, mounted on controlled rolling friction nodes, passes through switch 2 with a built-in charge preamplifier, a power line voltage filter 3, self-feeding block 4, high-pass filter 5, frequency response block 6, peak detector 7, second switch 8, ADC block 9, the input-output unit 10 and in the form of a digital code of the degree of destruction of the bearings enters the microprocessor processing unit 11, the display unit 15 and the communication unit 16 over the network. In this case, the control unit 17 controls the operation of the microprocessor processing unit 11, the latter, through the input / output unit 10, synchronizes the operation of the auto-feeding unit 4, the high-pass filter 5, the peak detector 7, the second switch 8 and the ADC unit 9. Next, the informative signal from the output of the frequency response unit 6 passes to the information recording unit 12 from the signal extremes and, in the form of codes for distributing the thickness of the lubricant layer, enters through the input / output unit 10 to the microprocessor processing unit 11, where it is processed and transmitted to a computer network (not shown) .

 In addition, the informative signal of the frequency response block 6 passes the average absolute value detector 13, the low-pass filter 14 and is fed to the fourth input of the second switch 8 to complete the Hilbert converter in block 9 of the ADC, which provides information through the input-output block 10 to the microprocessor block 11 for processing the frequency of the drums pulses, which allows to identify the belonging of defects to a specific element of the rolling bearing and the degree of danger of destruction. At the same time, the vibration signal from the output of the autororming unit 4 passes the first signal level detector 20, the second switch 8, the ADC unit 9 and the input-output unit 10, which allows you to set the operation mode of the autonorming unit 4 by the control codes of the microprocessor processing unit 11 through the input-output unit 10. In addition, the microprocessor processing unit 11 reads through the input / output unit 10 the state of the microswitch unit 18 of the number of channels involved and the serial number of the sensor and the signaling unit 19 about the operation of the equipment, which allows it to initialize switch 2, HPF 5, the second switch 8 and set the operation mode HPF 5, peak detector 7.

 Further, information about the potential state of the switch 2 through the second signal level detector 21 and the second switch 8, the ADC block 9, the input-output block 10 signals the microprocessor processing block 11 that there is a short circuit in the switch 2. To check the ADC block 9 through the second switch 8 preset potentials are supplied, which allows the microprocessor unit 11 through the input-output unit 10 to check the operability of the ADC unit 9.

 The second signal level detector 21 allows, through the second switch 8, the ADC block 9, the input-output block 10, the microprocessor processing block 11 to establish the operating mode of the high-pass filter 5, which increases the accuracy of the vibration signal processing.

 The proposed sensor provides registration of the degree of damage, the state of the thickness of the lubricant in the area of bearing loading and the belonging of defects to a specific element of the bearings, in addition, it increases the reliability of diagnostics by introducing "self-control" modes.

Claims (3)

 1. DIAGNOSTIC SENSOR FOR ROLLING FRICTION UNITS, comprising vibration transducers connected in series, a switch with a built-in charge preamplifier, a power line voltage filter, an auto-rating unit, a high-pass filter, an amplitude-frequency characteristic unit, a peak detector, an analog-to-digital converter unit, an input- an output and a microprocessor processing unit connected to the input of the microprocessor processing unit, a network communication unit, an indication unit and a control unit connected to the output of the amp unit a frequency-frequency characteristic, a unit for recording information about the extrema of the signal, connected by an output to the input of the input-output unit, and a series-connected average absolute value detector and a low-pass filter, as well as the first and second signal level detectors, connected by inputs to the output of the auto-normalization unit and high-pass filter output, a second low-pass filter connected to the output of the switch with a built-in charge preamplifier, a block of reference voltage sources connected to the input an input / output block of microswitches of the number of channels involved and the serial number of the sensor and an alarm block, while the input of the input / output block is connected to the control inputs of the switch with a built-in charge preamplifier, self-feeding unit, and peak detector, characterized in that it is equipped with a peak output connected between the detector and the input of the analog-to-digital conversion unit by the second switch with combined scale amplifiers, the second input of which is connected to the output of the first level detector signals, the third input with the output of the second signal level detector, the fourth and fifth inputs, respectively, with the inputs of both low-pass filters, and the sixth input with the output of the block of reference voltage sources, while the input of the input-output block is connected to the input of the second switch.  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.