SU1343265A1 - Device for checking defects of friction surfaces of sliding-contact bearings - Google Patents

Abstract

The device relates to the field of mechanical engineering and can be used in bearing and other areas of industry. The purpose of the invention is to improve the accuracy and reliability of control by localizing defects in the surfaces of the friction bearing bearings. The device consists of a drive shaft for a sliding bearing, a vibration transducer made in the form of a piezoceramic cylindrical sleeve with sectional, annular and common electrodes, a controlled thin-walled sliding bearing insert, a phase rotation device, a first and second generators, a noise filter, recording equipment and a vibration exciter. The control is carried out by deforming a thin-walled insert by a vibrator - a piezoceramic cylindrical sleeve - according to the traveling-wave principle, using a high-frequency acoustic flow generated by a vibration exciter to control the surface defects. The device allows control to be carried out both with rotating and stationary shafts. 4 np. (A (L 05 ate

Description

11343265

The invention relates to mechanical engineering, and can be used in the bearing and other industries, in particular for controlling the technical condition of sliding bearings.

The aim of the invention is to increase the accuracy and reliability of the control by localizing the defects of the friction surfaces of the sliding bearings. Figure 1 shows a diagram of the device; figure 2 - scan the outer surface of the piezoelectric sleeve with the location of the electrodes; FIGS. Z-15 9, which, through the phase shifting device, locates defects in the friction surfaces along the perimeter of the sliding bearing and turns on the second generator

sliding bearing and piezoceramic bushing with sectional electrodes for localizing contact, cross section; in fig. A - the same, with a ring electrode for picking up the informative signal.

The device contains a drive shaft 1 for mounting a sliding bearing 2, a vibrator 3, made in the form of a piezoceramic cylindrical sleeve with radial polarization, a thin-walled bearing insert 4, an annular electrode 5 deposited on the outer surface of the sleeve 3, sectional electrodes 6, the number of which is equal to four, located on the opposite sides of the annular electrode 5, the common electrode 7 connected to the sectional electrodes 6 phase rotation device 8 and the second generator 9. connected to the annular electrode ektrodu 5 i antijamming filter 10, which transmits signals with a frequency equal to the frequency of the generator 11 and The recording apparatus 12 and the exciter 13 coupled to the first oscillator 11 and mounted on the end of the drive shaft 1. . The device works as follows.

The drive rotates the drive shaft 1, on which the controlled bearing 2 is installed. Vibro-exciter 13, attached to the end of the shaft 1, creates the high-frequency acoustic flow with the help of the first generator 11, passing the shdy through the controlled bearing and modulated by the sliding contact zone.

If there are defects in the surfaces of the friction shaft 1 and 4

the total acoustic signal passing through the bearing changes its amplitude

9, which is through a phase shifting device compared to a high-frequency signal that has passed a defect-free bearing. The changed signal is picked up by the vibration transducer 3 by means of the ring electrode 5 and is fed through the anti-interference filter 10 to the recording apparatus 12. Using the registered signal, a general assessment of the technical condition of the sliding bearing is made.

To localize defects in the friction surfaces along the sliding bearing perimeter, a second generator is turned on.

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The signal 8 transmitter delivers a low-frequency signal (20-60 kHz) to sectional electrodes 6 of a piezoceramic sleeve

3, inside of which is placed a thin-walled insert 4 bearings.

The phase-shifting device 8 of the low-frequency signal supplies a signal to sectional electrodes 5 with phase displacement of / 2, as a result of which the opposite sectional electrodes, under the action of the applied signal voltage, cause bending deformation and a change in the shape of sleeve 3 and bushings

4. Superposition of bending standing waves in a ring transducer causes bending oscillations of the ring (in its plane) in the form of a traveling wave with a rotation frequency equal to I, This leads to localization of the contact of the insert-shaft surfaces in one contact zone, the state of which (presence defects, surface roughness, etc.) modulates the high-frequency acoustic flow generated by the vibration exciter 13. The modulated high-frequency acoustic flow signal using the vibrator 3 is fed to the filter 10 and then to the regis grating equipment 12. The registered signal allows an assessment of the state of defectiveness of the friction surfaces in the moment contact area. Under the action of a traveling wave, the contact area of the insert-shaft changes its location, thereby allowing the presence of defects to be monitored around the entire perimeter of the bearing, thus producing the selection of individual bearing defects.

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The device allows an assessment of the state of defectiveness of the friction surfaces, both during shaft rotation and in statics.

Thus, the device allows to increase the accuracy and reliability of control due to the localization of defects in the surfaces of the sliding bearing friction.

Claims (1)

Invention Formula A device for monitoring defects of the friction bearing bearing surfaces, containing a drive shaft for installing a sliding bearing, a vibration transducer, a vibration exciter at the end of the drive shaft, and recording equipment, characterized in that in order to increase the accuracy and reliability of control by localizing defects bearing friction surfaces of the generator to the 20th. It is equipped with a second generator, a phase-shifting device, an anti-noise filter, and a vibration converter. It is made in the form of a piezo-ceramic cylindrical sleeve, inside which a thin-walled bearing insert is installed coaxially on the outer surface of the sleeve. a perimeter has an annular electrode and four sectional electrodes, evenly spaced around the circumference of the annular electrode, and a common the electrode, while the ring electrode is connected through a noise filter to the recording equipment, and the sectional electrodes are connected through a phase rotation device to the second 6 5 6 UaCOsXt FIG. C (RigZ Editor C, Patrusheva Compiled by V. Puchinsky Tehred M.DidykKorrektor S. Cherni Zaka A801 / 42 Circulation 776 Subscription VNINPI USSR State Committee for inventions and discoveries 11303S, Moscow, Zh-35, Raushsk nab, 4/5 Iroynodnodno-polygraphic enterprise, Uzhgorod, st. Project, 4