SU805101A1 - Device for measuring axial load in ball bearings - Google Patents

Description

(54) DEVICE FOR DETERMINING AXIAL LOAD ON BALL BEARINGS

The invention relates to the bearing industry and can be advantageously used in the measurement of axial load on ball bearings.

A device for determining the frequency characteristics of mechanisms is known, comprising a white noise generator connected in series, a forming filter, a power amplifier, an electrodynamic exciter, a mechanism with test ball bearings, a vibration measuring transducer, a band-tunable filter 1.

However, this device has a low accuracy of measuring axial loads on bearings in assembled mechanisms.

The purpose of the invention is to improve the accuracy of measuring the axial load on the ball bearings in the assembled mechanisms.

The delivered pellet is achieved by the fact that the device contains a white noise generator connected in series, which forms a filter, a power amplifier, an electrodynamic exciter, a mechanism with test subjects and a vibro-measuring device

a converter, a band-tunable filter, a signal averaging unit over time, the first key element, a comparator, an inverter, an AND gate, a frequency splitter, a calculator, as well as a control oscillator, a trigger and a second key element, an analog storage device. The input of the control generator is connected to the output of the logical element I, the first output of the trigger is connected to the second inputs of the first key element and the logical element I, and the second output to the second inputs of the band-tunable filter and the averaging block of the signal over time, the first input of the second key device is connected to a signal averaging unit over time, and the second input with the comparator output, the output of the analog storage device connected to the second input of the comparator.

The drawing shows the block diagram of the device.

Claims (1)

It contains a series-connected white noise generator 1, forming a filter 2, a power amplifier 3, an electrodynamic exciter 4, a mechanism 5 with tested ball bearings, a vibration-measuring transducer 6, a band-tunable filter 7, a block 8 of the signal conditioner over time, the first key element 9, the comparator 10, the inverter 11, the logical A & I 12, the frequency amplifier 13, the calculator 14, and the control generator 15. the trigger 16 and the second key element P, the analog storage device 18. The input of the control generator 15 is connected to the output of the logic element 12, the first output of the trigger 16 is connected to the second inputs of the first key element 9 and the logic element 12, and the second output is connected to the second inputs of the tunable filter 7 and the signal averaging unit 8 over time, the first input of the second key device 17 is connected to the time averaging unit 8, and the second input with the output of the comparator 10, the output of the analog storage device unit 18 is connected to the second input of the comparator 10. The device operates as follows. The mechanism with the tested ball bearings 5 is excited by a signal with a frequency spectrum that covers the range of the expected variation of the frequency of the harmonic component, depending on the change in the contact angle of the bearing. For this purpose, a working frequency spectrum is cut out of the spectrum of white noise generator 1 by means of a shaping filter 2, which is fed through an amplifier 3 to electrodynamic exciter 4. The response signal from vibration measuring sensor 6 is fed to narrowband filter 7, which is discretely rearranged along the excitation spectrum, sequentially view the specified frequency range. Assuming that the process is stationary and effective, in the averaging block of the harmonic component over time, the duration of the averaging interval is determined by the duration of the impulses arriving at the input of setting the beginning and end of the averaging interval of the averaging block 8 over time. The pulses from the first output of the trigger 16, with their leading edges, rearrange the average frequency of the passband of the filter 7, and the duration of the pulses, which can be changed by the generator 15, determines the averaging time of the signal by the block 8. The pulses from the second (inverted) output of the trigger 16 control the first key element 9, which connects the output of block 8 to the first input of the comparator 10, where the amplitudes of the previous and subsequent signals are analyzed. Thus, the processes of reorganization of CI and analysis are separated in time. In those moments when the key element 9 oiTcpbiT, the time-averaged harmonic component of the response signal is fed to the first input of the KoivmapaTopa 10, to another input of which the voltage from the analogue storage device 18 is stored, in which the previous signals are stored. If the amplitude of the subsequent signal is greater than the previous one, then at the output of the comparator 10 a logical one appears. But since the signal from the output of the comparator 10 controls the second key element 17, the latter opens, and the analogue storage device 18 is recorded in the course of the new larger signal. At the moment of cut-off of the first key element 9, the second key element 17 is locked. If the confirming steps are equal to the frequency division factor of block 13, the signal at the output of the last one stops the master oscillator 15 and starts the computing device registering the frequency by which the frequency of the harmonic component is determined, dependent on the change in contact angle of the ball bearing. Then, according to the known dependence of the frequency of the selected component on the axial load, the value of this load is found. If the amplitude of one of the confirming steps is greater than that found, then the new value of the signal amplitude is entered into the memory ycTpoiiicTBO 14, and the frequency divider determined; the number of confirming signals is reset to the initial state by a pulse from the comparator output. Further operation of the device occurs as described above. Claims of Invention A device for determining the axial load on ballonstands containing an after-. a white shuma generator, formatively, forming a filter, power amplifier,. electrodynamic exciter, a mechanism with an ejected ball, sampling transducer, a vibration measuring transducer, a band-tunable filter, characterized in that, in order to improve the accuracy of measuring the axial load on the ball bearings, it is equipped with a series-connected block of time signal, the first input of which is connected to the output of the strip tuner. filter is the first key element, comparator, inverter, AND gate, frequency divider, calculator, as well as control gene an atorder, trigger and second key element, an analog storage device, the input of the control oscillator connected to the output of the logical element I, the first output of the trigger connected to the second inputs of the first key element in the logical element I, and the second output to the second inputs of the band pass tunable filter and averaging unit over time, the first input of the second key device051016 is connected to the averaging unit of the signal over time, and the second input is connected to the comparator output, the output of the analog storage device is connected to the second input of the computer. Sources of information taken into account in the examination 1. USSR Author's Certificate No. 412513, 10 cl. From 01 L 7/00, 1974.