SU1723482A2 - Device for testing condition of rolling bearings - Google Patents

Abstract

The invention relates to vibration measuring technology, can be used to monitor the condition of rolling bearings during their operation. The purpose of the invention is to increase the diagnostics depth by controlling the bearing at a variable rotation frequency and varying load. The device contains three identical channels for the extraction of positive and negative half-waves of shock pulses of vibration acceleration, vibration velocity and vibration displacement. The condition of the bearings is judged by the ratio of positive and negative half-waves of shock pulses of all three parameters. Separate determination of components increases the depth of diagnosis by detecting incipient defects. 1 il.

Description

The invention relates to a vibration measuring technique, can be advantageously used for monitoring the condition of rolling bearings during their operation, and is an improvement of the known device described in ed. St. No. 1276945.

It is known a device for monitoring the condition of rolling bearings comprising a series-connected vibrator, a matching amplifier, a high-frequency filter, a first integrator, a second integrator, to the output of which are connected the detector-detectors of positive and negative half-waves of shock pulses, whose outputs are connected to the inputs of the divider, the output of which through the amplifier is connected to the indicator.

. A disadvantage of the known device is the impossibility of separately determining the deviations of the elastic, dissipative and inertial characteristics, which leads to a small diagnostic depth in the control

bearings with variable rotation speed and variable load.

The purpose of the invention is to increase the diagnostics depth by controlling the bearings at variable speed and varying load.

The goal is achieved by the fact that a device for monitoring the condition of rolling bearings, containing a vibration transducer connected in series, a matching amplifier, a high-frequency filter, the first integrator, the second integrator, to the output of which the inputs of the detectors of positive and negative half-waves of shock pulses are connected to the outputs the inputs of the divider, the output of which through the amplifier is connected to the indicator, additionally introduced two dividers, two detectors of positive half-waves, two detectors negative half-waves of shock pulses and two amplifiers, and the inputs of additional dividers through the detectors of positive and negative half-waves

shock pulses are connected: the inputs of one divider to the second and third outputs of the first integrator, and the other divider to the second and third outputs of the high-pass filter, the outputs of additional dividers through amplifiers are connected respectively to the second and third inputs of the indicator.

The drawing shows a block diagram of a device for monitoring the condition of rolling bearings.

The device contains serially connected vibration converter 1, matching amplifier 2, high-frequency filter 3, first integrator 4. second integrator 5, the first and second outputs of which are connected respectively to the inputs of the detectors of positive b and negative 7 half-waves of shock pulses of vibration movements, the outputs of which are connected to the inputs of the first a divider 8 connected in series with the first amplifier 9 and the first input of the indicator 10. The second and third outputs of the first integrator A are connected to the detector inputs via 11 and negative 12 half-waves of shock pulses of vibration velocity, the outputs of which are connected to the inputs of the second divider 13 connected through the second amplifier 14 to the second input of the indicator 10. The second and third outputs of the high-frequency filter 3 are connected to the inputs of the detectors of positive 15 and negative 16 half-waves of shock pulses vibration accelerations, the outputs of which are connected to the inputs of the third divider 17 connected via the third amplifier 18 with the third input of the indicator 10.

The device for monitoring the condition of rolling bearings operates as follows.

With a bearing mounted on the bearing housing (not shown) of the vibration transducer 1 (for example, a piezo accelerometer), an electrical signal proportional to the level of the vibration acceleration of the bearing is amplified by the matching amplifier 2 and fed to the input of the high-frequency filter 3, which suppresses the low-frequency vibrations characteristic of normal machine operation or associated with imbalance shafts. From the first output of the high-pass filter 3, the signal passes through two integrating circuits. At the output of the first integrator 4, the signal is proportional to the magnitude of the vibration velocity, at the output of the second integrator 5 - to the vibration displacement. From the output of the second integrator 5, the signal simultaneously arrives at the inputs of the detectors of positive 6 and negative 7 half-waves of shock pulses of vibration displacements, from the outputs of which the rectified signals arrive at the first and second inputs of the first divider 8, which performs the operation of dividing the signals. From the output of the first divider 8, a signal proportional to the ratio of the components of the positive and negative values of the half-wave vibratory displacement is fed through the first amplifier 9 to the first input of the display unit 10.

From the second and third outputs of the first integrator 4, an electrical signal proportional to the level of vibration velocity of the sub5 spike at the same time enters the detector inputs of positive 11 and negative 12 half-waves of shock vibration velocity pulses, from whose outputs the rectified signals arrive at the first and second entrances of the second divider 13. С output

- the second divider 13 signal, proportional to the ratio of the constituent positive and negative values of the half-waves of the vibration velocity, is received through

5 the second amplifier 14 to the second input of the display unit 10. From the second and third outputs of the high-pass filter 3 an electrical signal proportional to the level of vibration acceleration

0 of the bearing, simultaneously arrives at the inputs of the detectors of positive 15 and negative 16 half-waves of shock acceleration pulses, from whose outputs the rectified signals arrive at the first

5 and the second inputs of the third divider 17. From the output of the third divider 17, a signal proportional to the ratio of the constituent positive and negative values of the half-waves of the vibration acceleration comes through

0 the third amplifier 18 to the third input of the display unit 10, which displays information about the current state of the bearing.

Separate determination of component vibration displacements, vibration velocities and

5 vibration accelerations allows to determine the deviations of the elastic, dissipative and inertial characteristics, which makes it possible to increase the depth of diagnosis, to reveal more subtle (nascent) defects.

0 monitor bearings with variable speed and varying load. . .

Claims (1)

The invention formula .. Device for monitoring the state of rolling bearings according to ed. St. No. 1276945, characterized in that, in order to increase the diagnostics depth by controlling the bearings at variable speed and varying load, the second and third dividers, amplifiers, positive detectors and negative half-shock detectors of the first impulses are additionally introduced into it the integrator is connected via the second detectors of positive and negative half-waves of shock pulses, respectively, to the inputs of the second divider, the second and third outputs of the high-pass filter are connected according to But through the third detectors of positive and negative half-waves of shock pulses with the inputs of the third divider, the outputs of the second and third dividers, respectively, through the second and third amplifiers are connected to the second and third inputs of the indicator.