SU783620A1 - Rolling-contact bearing diagnosis method - Google Patents

Description

Union of Soviet

Socialist

Republics

op and

Inventions

0.783620

TO AUTHOR'S CERTIFICATE (61) Additional to author. certificate (22) Declared 02/26/79 (21) 2729332 / 25-27 (51) M. Cl. ³

USSR State Committee for Inventions and Discoveries with the addition of application No. (23) Priority

Published on November 30th, 2008. Bulletin No. 44

Date of publication of the description of ZOD1.80

G 01 M 13/04 (53) UDC 658.562.

.012.7 (088.8) (72) The inventors

P.B. Bambalas, K.M. Ragulskis, M.S. Rondomanskas and V.I. Chuprin (71) Applicant

Kaunas Polytechnic Institute named after A.Snechkusa (54) METHOD FOR DIAGNOSTIC ROLLING

BEARINGS

The invention can be used mainly in the diagnosis of rolling bearings.

A known method for diagnosing rolling bearings, including measuring 5 indicators of friction and wear during rotation of the bearing under load and filtering the received signals at different frequencies [1 ^. "L However, the known method has the disadvantage that it does not allow to detect defect formation on the rolling surfaces of the bearing.

The aim of the invention is to detect the onset of defect formation 15 on the rolling surfaces of the bearing.

This goal is achieved due to the fact that the bearing is driven under load, measuring 20 changes in the friction and wear process, filtering the received signal at different frequencies, measuring the signal at frequencies that carry information about defect formation processes, at the 25th moment the signal is absent at frequencies, carrying information about the friction processes, and according to the information received, it is judged about the beginning of defect formation on the rolling surfaces of the bearing. thirty

The invention is illustrated by a block diagram of a device for implementing the method.

The device contains a series-connected vibration sensor 1 and amplifier 2, as well as the first band-pass filter 3, amplifier 4, threshold block 5, second band-pass filter 6, amplifier 7, threshold block 8 and NAND gate 9, key 10, recording device 11. The output of amplifier 2 is connected to the inputs of the first 3 and second 6 bandpass filters. The outputs of the first 5 and second 8 threshold blocks are connected to the first and second inputs of the AND-NOT 9 logic element, and the output of amplifier 7 is connected to the second input of key 10.

Vibration sensor 1 measures the vibration of the bearing and converts it into an electrical signal, which is amplified by amplifier 2 and filtered by band-pass filters 3, 6, tuned to frequencies that respectively carry information about the friction processes and defect formation processes on the bearing surfaces. The received signals after amplification by amplifiers 4 and 7 are fed to threshold blocks 5 n 8, which form rectangular pulses arriving at the logic element, AND ~ NOT 9, which controls the operation of key 10. Using key 10, the recording instrument 11 measures the signal at frequencies Carrying information on the processes of defect formation, c. Currently there is no signal at frequencies carrying informa- tion about ⁵ processes treniya..Po largest intensity of these signals is judged early defect on the surfaces of the rolling bearing.

Claims (1)

f54) METHOD OF DIAGNOSTICS OF ROLLING BEARINGS The invention can be used in advance in the diagnosis of rolling bearings. A known method for diagnosing rolling bearings includes measuring friction and wear processes while rotating a bearing under load and filtering received signals at various frequencies. However, the known method has the disadvantage that it does not detect defect formation on the rolling surfaces of the bearing. The aim of the invention is to detect the onset of defect formation on the rolling bearing surfaces. This goal is achieved due to the fact that the bearing drives rotation under load, measures changes in friction and wear process indicators, filters the received signal at various frequencies, measures the signal on the frequency carrier, carrying information about defect formation processes, at the moment when there is no signal at frequencies bearing information about the processes of friction, and according to the information received, judging the beginning of defect formation on rolling bearing surfaces. The invention is illustrated by a block diagram of an apparatus for carrying out the method. The device contains a series-connected vibration sensor 1 and amplifier 2, as well as the first band-pass filter 3, amplifier 4, threshold unit 5, second band-pass filter 6, amplifier 7, threshold unit 8 and AND-NE logic element 9, key 10, recording device 11. The output of the amplifier 2 is connected to the inputs of the first 3 and second b band-pass filters. The outputs of the first 5 and second 8 threshold blocks are connected to the first and second inputs of the NAND logic 9, and the output of the amplifier J is connected to the second input of the switch 10. The vibration sensor 1 measures the vibration of the bearing and converts it into an electrical signal that is amplified by the amplifier 2 and is filtered by band-pass filters 3, 6, tuned to frequencies that respectively carry information about friction processes and defect formation processes on the rolling surfaces of the bearing. The received signals, after amplification by amplifiers 4 and 7, arrive at threshold blocks 5 and 8, which forvert rectangular pulses arriving at the logic element. B – II 9, controlling the key operation of key 10. From key 10, the registering device 11 measures the signal at frequencies Information on defect formation processes, c. the moment of the absence of a signal at frequencies that carry information about friction processes. At the Intensity of these signals, the beginning of defect formation on bearing rolling surfaces is judged. Claims Method for diagnosing rolling bearings, including measuring Lei processes of friction and wear during rotation of a bearing under load and filtering received signals at different frequencies, characterized in that, in order to detect the onset of defect formation on the rolling surfaces of a bearing, the signal at frequencies that carry information about defect-formation processes, at the time of the absence of a signal at frequencies that carry information and friction processes, and, according to half-a-century information, judge the beginning of defect-forming th on the surfaces of the rolling bearing. Sources of information taken into account in the examination 1. USSR author's certificate 540186, cl. G 01 M 13/04, 1977.