SU1276945A1 - Method for checking condition of antifriction bearings and device for effecting same - Google Patents

Abstract

The invention relates to vibration measuring technology and can be used to control the condition of rolling bearings during their operation. The aim of the invention is to improve the accuracy of determining the condition of rolling bearings, simplify the operation of the device and extend the functionality. With a vibration transducer attached to the bearing housing, an electrical signal proportional to the level of the acceleration of the bearing is amplified by a matching amplifier. Next, this signal is fed to the input of the high-pass filter. From the output of the latter, the signal passes through two integrating circuits: at the output of the first, the signal is proportional to the magnitude of the vibration velocity, and at the output to the second vibrational displacement. From the output of the second integrating circuit, the signal simultaneously arrives at the inputs of the detectors of positive and negative picoQ (About the output half-wave values. From the output of the divider device, the signal is proportional to the ratio of the peak values of the positive and negative half-wave values, and is fed to the indicator, displays information about the state of the bearing. 2 cf f-crystals, 1 ill.

Description

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The invention relates to vibration measuring technique and can be used to monitor the condition of rolling bearings during their operation.

The aim of the invention is to improve the accuracy of determining the condition of bearings, to simplify the operation of the device, to expand the functional capabilities of diagnosing bearings with variable speed of rotation, to change the shaft and variable load conditions.

L The drawing shows a block diagram of the proposed device.

The device consists of a series-connected vibration converter 1, a matching amplifier 2, a high-pass filter 3, a first integrating circuit 4, a second integrating circuit 5, a detector of 6 positive half-waves, a detector 7 of negative half-waves, a dividing device 8, an amplifier 9 of direct current, an indicator 10, moreover, the detector inputs of positive 6 and negative 7 half waves are connected to the output of the second integrating circuit, and the output of the detector 6 positive half waves to the first input of the divider device, the detector output 7 and negative half waves is connected to the second input of the divider 8.

The method is carried out as follows.

With the vibration transducer 1 fixed on the bearing housing, 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-pass filter 3, which cuts off the low-frequency vibration signals inherent in the normal operation of the gashin or associated with the shaft imbalance. From the output of the high-pass filter, the signal passes through two integrating circuits: at the output of the first integrating circuit 4, the signal is proportional to the magnitude of the vibration velocity, and at the output of the second integrating circuit 5 - to the vibration displacement. From the output of the second integrating circuit 5, the signal simultaneously arrives at the inputs of the positive detectors

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6 and negative 7 peak half-waves, from the outputs of which the rectified signals are fed to the first and second inputs of the dividing device

5-8, performing the operation of dividing the signals. C. The output of the dividing device is a signal proportional to the ratio of the peak values of the positive and negative values of the half-waves,

 O is amplified by the DC amplifier 9 and fed to an indicator displaying information about the state of the bearing.

Claims (2)

 ". The invention relates to vibration measuring technique and can be used to monitor the condition of rolling bearings during their operation. The aim of the invention is to improve the accuracy of determining the condition of bearings, simplify the operation of the device, expand the functional capabilities of diagnosing bearings with variable speed, shaft rotation and variable load conditions, L The drawing shows the block diagram of the proposed device. The device consists of series-connected vibration converters 1, matching amplifier 2, high-pass filter 3, first integrating circuit 4, second integrating circuit 5, detector 6 positive half-waves, detector 7 negative half-waves, dividing device 8, amplifier 9 dc, indicator 10 The detector inputs of positive 6 and negative 7 half waves are connected to the output of the second integrating circuit, and the output of the detector of 6 positive half waves to the first input of the divider device, the output of the detector 7 and negative half waves is connected to the second input of divider 8. The method is carried out as follows. With the vibration transducer 1 fixed on the housing, 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-pass filter 3, which cuts off the low-frequency vibration signals characteristic of the normal operation of the gashin or associated with the imbalance of the shafts. From the output of the high-pass filter, the signal passes through two integrating circuits: at the output of the first integrating circuit 4, the signal is proportional to the magnitude of the vibration velocity, and at the output of the second integrating circuit 5 - to the vibration displacement. From the output of the second integrating circuit 5, the signal simultaneously arrives at the detector inputs of a positive 52 6 and negative 7 peak half-waves, from the outputs of which the rectified signals arrive at the first and second inputs of the divider device 8, which performs the operation of dividing the signals. The output signal of the divider device, proportional to the ratio of the peak values of the positive and negative half-wave values, is amplified by the direct current amplifier 9 and fed to an indicator displaying information about the state of the bearing. Claim 1. The method of monitoring the condition of rolling bearings, consisting in that the signal from the vibration transducer is amplified, making the components of the amplitudes of the vibration accelerations in the informative frequency band, characterized in that, in order to improve the accuracy of determining the condition of rolling bearings and expand the functionality , the ratio of the amplitudes to the vibration displacement is determined by the positive and negative half-waves of the shock pulses, and the state of the scientific research institute of bearings is judged by the magnitude of this ratio. 2. A device for monitoring the condition of rolling bearings, containing a series-connected vibration transducer, a matching amplifier and a frequency filter, as well as an indicator and detectors of positive and negative peak values of a half-wolf, characterized in that, in order to improve the accuracy of determining the condition of rolling bearings, expand functional capabilities and simplify the device in operation, it introduced two series-connected integrators, a divider and a DC amplifier, the output of which connected to the input of the indicator, and the inputs of the divider are connected respectively to the outputs of the detectors of positive and negative half-waves, the inputs of which are connected to the output of the second integrator, and the input of the first integrator is connected to the output of the frequency filter.