SU1633309A2 - Device to check up friction surfaces of plain bearings for defects - Google Patents

Abstract

The device relates to mechanical engineering and can be used to control 2. l technical condition of sliding bearings. The purpose of the invention is to expand the functionality by localizing defects along the length of the support. To locate defects in the friction surfaces along the length of the bearing support 2, a second generator 11 is connected through an adjustable phase-shifting device and a switch 14 to the first 5 and second 7 ring electrodes. Phase displacement causes bending deformation and shape change along the depth of support of support 3 and liner 4. The state of localized point and of friction surfaces modulates twist. Achievement of the active PG / current generated by the generator 8. 5 Il.

Description

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The invention relates to the field of engineering, can be used to control the technical condition of sliding bearings and is an improvement of the known device according to the author. St. No. 1434308.

The purpose of the invention is to expand the functionality by localizing defects along the length of the support.

FIG. 1 shows the scheme of the proposed device; in fig. 2 is a scan of the outer surface of a piezoceramic cylindrical sleeve with an arrangement of electrodes; FIG. 3-5 are a sliding bearing and a piezo-ceramic sleeve with annular electrodes located on opposite sides of the sleeve with

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defects on the length of the support, longitudinal section.

The device contains a drive shaft 1 day of installation of the bearing 2 slide, IC converter 3 made in the form of piezoceramic cylindrical E (tulk, thin-walled bearing 4 bearing, the first ring electrode 5. applied to the outer surface of the sleeve 3, sectional eectrodes b, the second ring electrode 7, which connected to a generator p / 8 of vibration, a common electrode 9, an adjustable phase-shifting device 10 and a second generator 11 creating an electric field connected to the first ring electrode 5 of anti-noise A second filter 12 transmits signals with a frequency equal to the frequency (operator 8 is vibrating, recording equipment 13 and switch 14, by means of which the second generator 11 is connected to the first 5 and second 7 ring electrodes through an adjustable reducing device 10.

The device works as follows

The drive drives the drive shaft 1, on which the controlled bearing 2 is mounted. An annular electrode 7 deposited on the outer direction of the piezoceramic sleeve 3, the common electrode 9 and the vibration generator 8 in the controlled bearing creates a high frequency (100 K (c 1 MHz) acoustic flow passing through the bearing and the modulated sliding contact zone. If the contact area of the friction surfaces shaft 1 and vkpadysha 4 contains defects, the high-frequency acoustic signal, having passed the bearing, changes its amplitude compared to the high-frequency signal that passes the defect-free

bearing. The high-frequency signal transmitted through the bearing is removed by the vibration transducer via the ring electrode 5 and through the anti-interference

the filter 12 is fed to the recording apparatus 13. The received signal allows a general assessment of the technical state of the friction surfaces.

In order to locate defects in the friction surfaces along the length of the bearing support, a second generator 11 is used to create a directional electric field, which with the help of an adjustable phase-rotation device 10 delivers a low-frequency

a signal (1-100 Hz) to the first and second ring electrodes 5 and 7, which are connected via a switch 14 to a phase shifter 10.

The phase rotary device 10 of a low-hour signal sends a signal to the ring electrodes 5 and 7 with the phases shifted by h relative to each other, as a result of which the ring electrodes 5 and 7 located along the edges of the piezoceramic sleeve 3 are

the action of the applied voltage of the signal causes bending deformation and shape change along the length of the support of the sleeve 3 and the insert 4 (Fig. 3-5). This results in:

an insert-shaft along the perimeter line (dashed line) of the bearing cross-section, which during bending deformations of the sleeve 3 moves along the entire length of the support. Localized Contact State

friction surfaces along the perimeter line of the transverse section modulates the high-frequency acoustic flow created by the vibration excitation operator 8. The modulated high-frequency acoustic flow signal, as in the general assessment of the technical condition of the friction surfaces, is supplied to the projectile noise filter 12 and the recording equipment 13 using the ring electrode 5. The recorded signals allow an assessment of the state of defectiveness of the bearing friction surfaces in different sections along the length supports, as under the action of a longitudinal traveling wave created by annular electrodes 5 and 7 and phase shifting device 10, the transverse perimeter of the contact zone is the w-shaft changes its position along the length of the support, allowing to control the presence of defects

5 along the length of the bearing support.

When the B and C contacts are disconnected, the 14 transponder is switched on and the A contacts are turned on, the described device works in the same way as

The proposed device allows monitoring the defectiveness of the bearing friction surfaces both during rotation of the shaft and in statics.

Thus, the proposed device allows to extend the functionality by locating defects along the support length by supplying the device with a switch and performing it with connecting the second generator through a phase shifter and a switch to existing ring electrodes.

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Claims (1)

Invention Formula A device for monitoring defects of friction surfaces of sliding bearings on the author. St. No. 1434308, characterized in that, in order to extend the functionality by localizing defects along the length of the support, it is equipped with a switch, the inputs of which are connected to the outputs of an adjustable phase-shifting device, and the outputs - with ring electrodes. eight . FIG. five Fig.C