SU659923A1 - Device for diagnosis of ball bearings - Google Patents

Description

one

The invention relates to the field of mechanical engineering and to be advantageously used in the bearing industry.

A device for diagnosing rolling bearings is contained, which are connected in series to a vibration converter, an amplifier, a frequency analyzer, a coincidence unit and a series-connected synchronizer, a counter, a matrix decoder, as well as a threshold unit and a digital pointer converter, the second input of the coincidence unit being connected to the first the output of the matrix decoder, and the second output of the synchronizer is connected to the second input of the frequency analyzer 1.

The known device has the disadvantage that it does not allow to predict the service life of the ball bearings with sufficient accuracy.

The aim of the invention is to accurately determine the service life of the ball bearings.

This goal is achieved due to the fact that the device is equipped with a series-connected OR circuit, a digital-to-analog converter, a first key circuit and operating units, as well as a ball bearing life-time unit, a second key circuit, and a pulse generator. In this case, the output of the pulse generator is connected to the first input of the second key circuit, the second input of which is connected to the output of the ball bearing life time block, and the output of the second key circuit is connected to the digital converter with a pointer. The input of the OR circuit is connected to the output of the matching block. The second output of the matrix decoder is connected to the second input of the digital-to-analog converter. The third output of the matrix decoder is connected to the second input of the first key circuit, and the fourth output of the matrix decoder is connected to the second input of the operating unit and the second input of the ball bearing life-time unit. In addition, the output of the operating unit is connected to the input of the threshold unit, the output of which is connected to the first input of the unit for forming the time interval for the life of the ball bearings.

The drawing shows a diagram of the proposed device.

The device consists of series-connected vibration converters 1, amplify .11 2, frequency analyzer 3, unit

1 coincidence, the OR circuit 5, the analog-to-analog converter 6, the first key circuit 7, the operation unit 8, the threshold unit 9, the unit 10 for forming the time interval for the life of the ball bearings and the series-connected synchronizer 11, the counter 12, the matrix decoder 13, and the series-connected generator 14 pulses of the second key circuit 15, of the digital converter device 16. Moreover, the second input of the coincidence unit 4 is connected to the first output of the matrix decoder 13. The second output of the synchronizer 11 is mechanically The ski is connected to the second input of the frequency analyzer 3, the second output of the matrix decoder 13 is connected to the second input of the digital-to-analog converter 6, the third output of the matrix decoder 13 is connected to the second input of the first key circuit 7, the fourth output of the matrix decoder 13 is connected to the second input of the operating unit 8 and the second input of the unit 10 forming the time interval of the resource life of the ball bearings, the output of which is connected to the second input of the second key circuit 15.

The device works as follows. The vibration converter 1 converts the vibration of the diagnosed bearing into an electrical signal, which is amplified by the amplifier 2. Next, the amplified signal is fed to the frequency analyzer 3. Simultaneously from the synchronizer 11, the counter 12 receives a synchronizing and pulse sequence. The information from counter 12 is fed to a matrix decoder 13, the codes of theoretically defined information frequencies and codes of control signals are placed on the dial field of which. The matrix from the matrix decoder 13 enters the coincidence unit 4 when the frequency analyzer 3 is tuned to one of the information frequencies. Each bus of the matrix decoder 13 corresponding to a certain information frequency is connected to its coincidence circuit in a match block 4.

At the beginning of operation, the matrix decoder 13 sends signals to the second input of the digital-to-analog converter 6 and to the second input of the operation unit 8, which bring these blocks to zero state. The second input of coincidence unit 4 is received from frequency analyzer 3, a signal proportional to the vibration amplitude of the rolling bearing under test at the tuning frequency of frequency analyzer 3. With simultaneous occurrence of signals at both inputs, an output appears at the output of coincidence unit 7, which then through the OR circuit 5 is fed to the input of a D / A converter 6, on

which is the accumulation of pulses equal to the number of coincidence frequencies that come from frequency analyzer 3, and information frequencies dialed on the dial field of the matrix decoder in the entire diagnosed frequency range. A digital-to-analog converter converts pulses into voltage, the value of which is proportional to the number of matched sectral components of vibration exceeding a certain threshold, which is controlled by the gain knobs on the frequency analyzer 3. The output of the digital-to-analog converter 6 is removed

voltage, the magnitude of which is proportional to the initial conditions necessary for solving in the operational block 8 of the equation describing the time variation of the parameter associated with the resource

ball bearing work.

Upon completion of the analysis, a signal is taken over the entire frequency range from the matrix decoder 13, which opens

The first key circuit 7 and the voltage proportional to the initial conditions pass from the output of the digital-to-analog converter 6 to the first input of the operation unit 8. From the fourth output of the matrix decoder 13, the control signal goes to the second input of the operation unit 8 to turn it on in p, operation and to the second input of the unit 10 for forming the time interval of the life of the ball-bearings for forming the beginning of the time of the service life of the ball bearings. In this case, a signal is taken from the unit 10 for forming the time interval for the life of the ball bearings and is fed to

the second input of the second key circuit 15. In this case, the second key circuit 15 is opened and the signals from the pulse generator 14 are passed to the digital converter-pointer 16, where their number is recorded. A signal proportional to the number of spectral components of vibration at time t is removed from the output of the operation unit 8 and enters the threshold unit 9, where it is compared with the critical value, as soon as the signal reaches the projective critical value, the threshold unit 9 is also triggered at its output A signal appears that goes to the first input of the block.

10 forming the time interval of the life of the ball bearings to form the end of the time interval of the life of the ball bearings and leads the block 10 forming the time interval

the life of the ball bearings in the off state, in which there is no signal at its output.

The second keynote 15 stops passing signals from the generator.

14 pulses.

Claims (1)

Invention Formula A device for diagnostics of ball bearings containing a serially connected vibrator, an amplifier, a frequency analyzer, a coincidence unit and a serially connected synchronizer, a counter, a matrix decoder, as well as a threshold unit and a digital converter pointer, while the second input of the coincidence unit is connected to the first output of the matrix decoder, and the second output of the synchronizer is connected to the second input of the frequency analyzer, which differs from the fact that, in order to determine the service life, the ball bearing ov, it is equipped with a series-connected OR circuit, a digital-to-analog converter, a cert key circuit and an operating unit, as well as a ball bearing life time block, a second key circuit and a pulse generator, with the output of the pulse generator connected to the first input of the second key circuit. the second input of which is connected to the output of the block forming the time interval of the life of the ball bearings, and the output of the second key circuit is connected to digital converter-pointer, the input of the OR circuit is connected to the output of the matching block, the second output of the matrix decoder is connected to the second input of the digital-to-analog converter, the third output of the matrix decoder is connected to the second input of the nerve key circuit; the fourth output of the matrix decoder is connected to the second input of the operation unit II with the second input of the unit forming the time interval of the life of the ball bearings; in addition, the output of the operating unit is connected to the input of the threshold unit, the output of which is connected to the first input of the block forming the time interval of the life of the ball bearings. Sources of information taken into account at the examination 1. USSR author's certificate No. 525867, cl. G 01I 13/04, 1976.