SU721696A1 - Device for diagnosis of ball bearings - Google Patents

Description

This invention relates to general engineering.

A device for diagnostics of ball bearings, one-sided connected vibration transducer, amplifier, frequency analyzer, as well as a threshold unit, a digital converter pointer, and a pulse generator 1 is known.

However, such a device has a low diagnostic accuracy of the parametric life of ball bearings.

The aim of the invention is to improve the accuracy of diagnostics of the parametric life of ball bearings.

The goal is achieved by the fact that the device is equipped with a series-connected quadrant, whose input is connected to the output of the frequency analyzer, an adder, a square root extraction unit, a storage unit, a dividing unit, the second input of which is connected to the second output of the square root extraction unit, an integrator, the second input of which is connected to the output of a pulse generator, an accumulation unit, a digital converter-pointer connected in series by a diagnoser sensor parameter being tested, by the AND element, the meter, the threshold block m. as well as a mechanical oscillator and a mode switching unit, the first

the output of which is connected to the input of the mechanical oscillation generator, the second to the second input of the element I, the third input to the second input of the pulse generator, the first input of the mode switching unit is connected to the second output of the threshold unit, and the second input to the second output of the storage unit.

A device for diagnostics of ball bearings contains a vibration transducer connected in series, an amplifier

2, frequency analyzer 3, quad 4, adder 5, square root block 6, storage unit 7, dividing unit 8, cube raising unit 9, integrator 10, accumulation unit 11 and digital pointer converter 12, as well as sensor 3 of the parameter being diagnosed for element I 14, meter 15, threshold unit 16, pulse generator 17, the output of which is connected to the second input of the integrator 10. Device

also contains series-connected mode switching unit 18 and mechanical vibration generator 19. The second output of the square root extraction unit is connected to the second input of the dividing unit 8.

The device works as follows.

At the initial moment, the generator 19 of mechanical vibrations is turned off, then the AND circuit is open. Vibrating transducer 1 converts the vibration of a diagnosed ball bearing unit into an electrical signal, which is amplified by amplifier 2. Next, the amplified signal goes to frequency analyzer 3. From frequency analyzer 3, the amplitudes of the detected spectral components are applied to square 4, where their values are TC is squared and is fed to the adder 5, to which the cube of the elastic approximation of the contacting bodies, caused by static loads, is supplied as source data, further in block 6 square-root extraction is performed by power conversion of the signal that led from the adder 5, the converted signal is fed to the storage unit 7, while the signal from the storage unit 7 is fed to the mode switching unit 18. In this case, the dynamic load is fixed on the storage unit 7.

Simultaneously with this process, the sensor 13 of the parameter being diagnosed (temperature sensor, vibration sensor, etc.) converts the physical value of the parameter being diagnosed into an electrical signal, which through the element 14 goes to the meter 15, where the effective (maximum, average) value is measured signal and is compared in threshold block 16 with a critical value determining the parametric life of the bearing assembly. If the critical value is not reached, then a signal is taken from the threshold unit 16, which is fed to the mode switching unit 18. If there are signals at the two inputs of the mode switching unit 18, it triggers and activates the mechanical oscillator 19, turns off the element 14 and forms the leading edge of the pulse generated by the pulse generator 17.

During the operation of the mechanical vibration generator 19, a chain consisting of the vibrator 1, amplifier 2, frequency analyzer 3, quadrant 4, adder 5 and glare 6 square root extracts the vibration analysis in the same way as when the mechanical oscillator is turned off. After analyzing over the entire frequency range, a signal proportional to the dynamic

the load under the action of the formative factor and is fed to the second input of the dividing unit 8, to the first input of which the signal from the storage unit 7 is supplied, and one signal is divided by another. This relationship is then cubed in the cubing block 9, producing a voltage proportional to the acceleration factor that goes to the integrator integrating this signal for the duration of the pulse generated by the generator 17 pulses. The pulse generator 17 generates a pulse whose duration is proportional to the parametric resource under the conditions of the forcing factor. The signal at the integrator output is proportional to the product

the acceleration factor on the parametric resource under conditions of forcing, i.e., the parametric resource under diagnostics under operating conditions.

0 From the integrator output, signals are sent to accumulation unit 11, where information about the parametric resource being diagnosed is accumulated, and then to a digital pre-imager-pointer 12. After a certain period of time, the mode block

5, switch 18 is triggered, generator 19 is turned off. the circuit 14 opens. The process of analyzing the vibration and measuring the diagnosed parameter repeats with the disconnected generator 19. If the critical value is not reached, then if there are signals at two inputs of the mode switching unit 18, it is triggered and the generator 19 starts up again, turns off the AND element 14 c, the process is repeated.

5 When the diagnosed naD; imeter of the critical value exceeds the output of the threshold unit 16, a signal is taken which is fed to the input of the generator 17 or pulses, forming the trailing edge of the generated rectangular pulse.

The magnitude of the accumulated signal on the digital converter-pointer determines the parametric resource of the diagnosed ball bearing assembly.

Claims (1)

Invention Formula A device for diagnostics of ball bearings, containing a serially connected vibration converter, an amplifier, a frequency analyzer, as well as a threshold unit, a digital converter-pointer and a pulse generator, characterized in that, in order to improve the accuracy of diagnostics of the parametric life of the ball bearings, it is equipped with a series-connected quadrator whose input connected to the output of the frequency analyzer, an adder, a square root extraction unit, a storage unit, a dividing unit, a second input of which is connected to, with the OUTPUT block, the square root extraction, the cube-building unit, the integrator, the second input of which is connected to the output of the impulse generator, accumulation unit and digital converter-pointer, successively connected by a sensor of the type being diagnosed, an element And a meter, a threshold unit, and also a mechanical oscillator and a mode switching unit, the first the output of which is connected to the input of the generator of mechanical oscillations, the second to the second input of the element I. the third output to the second input of the pulse generator, the first input of the mode switching unit is connected to the second output of the threshold unit, and the second input to the second output of the storage unit. Sources of information taken into account for expert examination 1. USSR author's certificate for application No. 24069773/25. cl. G 01 M 13/04. 1976. Oyekgl uccfletiooanuft