RU2492002C1 - Precision bearing washing machine - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to machine building, particularly, to production of precision bearings. Cavitation washing efficiency is upped by modification of activator that excited resonance oscillations consisting in making the activator mirror composed of alternating equidistant ring-like stiff and retarded shifting elements. Delay of shifting elements in activator oscillations creates vertical layer-by-layer shift of washing fluid to up the cavitation effect.

EFFECT: higher efficiency.

1 dwg

Description

The invention relates to mechanical engineering, specifically to the development of equipment for liquid washing instrument bearings.

Known installations [1] and others, in which to achieve a high degree of surface cleaning (for example, in the aviation, rocket and space and other industries) when exciting vibrations of a washing liquid, highly effective solvents are used, for example, Freon 113 (C ₂ F ₂ C1 ₃ ) and others. However, its use is contrary to the requirements of the 1985 Vienna Convention for the Protection of the Ozone Layer. The used analogues of HFC 113, water-washing agents, for example, Detalon, etc., have a complex chemical composition, require chemical compatibility of the detergent with the working medium, and have a significant cost.

The fundamental solution, allowing to abandon the use of hydrocarbon liquids, special detergents and chemical additives, was the development of the device according to the patent of the Russian Federation No. 1734886 from 05.23.1992 (auth. Frolov K.V., Kuznetsov N.D., Ganiev R.F. ., Gromakovsky D.G. et al.), In which in a vertically located technological bath (for given geometrical ratios of the bath and the activator), the resonant oscillations of the washing liquid are excited with the help of a cam mechanism, creating intense cavitation, providing the necessary quality GUT washing without using special liquids and washing of chemicals due to cavitation effect.

The disadvantage of this solution is the low productivity of surface cleaning, due to the intermittent contact of the cam drive, which reduces the dynamics of the disturbance of the washing medium.

This drawback was partially eliminated in RF patent No. 2024336 dated December 15, 1994 (auth. Abrashkin AM, Gromakovsky D.G. and etc.), in which the device for cleaning parts contains a process bath filled with washing liquid, with in it a cavitation emitter. During the collapse of cavitation cavities, hydraulic shocks occur, which clean the surface of the parts from contamination. The emitter is driven by a crank mechanism with an elastic link and is driven by an engine with an adjustable speed. For an instant stop of the exciting link and the emitter, an emphasis is installed that provides impact from the leading link to the emitter. As a result, cavitation saturation of the washing liquid is created.

The specified device is taken as a prototype.

The disadvantage of the prototype device is the horizontal front of the generated pressure pulsation waves generated by the flat activator, which does not allow to obtain a higher degree of energy “pumping” into the washing liquid.

The technical result of the invention is to increase the intensity of the excited cavitation in the washing liquid to improve the quality and performance of cleaning surfaces of the parts.

The technical result is achieved by the fact that the activator mirror - 7 is made in the form of alternating circular rigid equidistant from the center - 11, 12, 13, 14 and delayed shifting elements - 1, 2, 3, 4, while the delay value of the shifting elements of the activator mirror is 7 set by changing the diameter of the throttling holes - 10, connecting the cavity of these elements with the capacity of the washing chamber - 6.

The proposed installation for washing precision bearings is shown in Figure 1.

The installation contains delayed shifting elements - 1, 2, 3, 4, a cartridge - 5, a washing chamber - 6, an activator - 7, a vibration drive - 8, a control panel - 9, holes - 10, ring rigid elements - 11, 12, 13, fourteen.

In the washing chamber - 6, filled with washing liquid (industrial water), the bearings located in the cartridge - 5 are washed.

Under the cassette place the activator - 7, associated with the vibrator - 8.

In this case, a pneumatic vibrator is used as a vibrodrive.

Activator control - 7 in frequency and amplitude of oscillations is made by changing the flow rate and air pressure on the control panel - 9 (9a - flow control, 9b - pressure control).

To increase the intensity of cavitation, the activator mirror - 7 is divided into n annular zones equally spaced from the center (n = 3 ... 4). The gaps between the retarded moving elements - 1, 2, 3, 4 are performed at an equal distance. For example, with an activator diameter D = 340 mm, four ring elements with a width of strips (inserts and hard sections) of 30 mm are placed on the mirror.

During operation of the installation, the vibrodrive - 8 informs the activator - 7 of the reciprocating movement, as a result of which, on the ring elements of the mirror of the activator - 7, the hydrodynamic pressure q = φ (f, A) arises as a function of the frequency and amplitude of its movement. Rigid ring elements - 11, 12, 13, 14 move vertically together with the activator - 7, and delayed shifting elements - 1, 2, 3, 4 under the action of pressure are displaced by the value of the gap "A", which creates a time delay of the movement of the liquid wave .

The magnitude of the delay is determined by the diameter of the holes - 10 (See Fig.1a) on the delayed shifting elements - 1, 2, 3, 4.

As shown by measurements of pressure pulsation, with the same mode of oscillation of the activator, in the claimed case increases to 30 percent or more.

The essential features of the proposed technical solution, not available in published sources and patents, the authors consider the following.

1. The separation of the activator mirror into equidistant, alternately located annular surface zones is rigid and pliable, which creates a relative delay of layer-by-layer moving fluid waves, which increases the level of excitation, and as a result, increases the activity of cavitation formation.

2. The ability to control the delay of the moving elements of the activator mirror by selecting the diameter of the holes - 10, releasing liquid from under the shifting element.

The proposed technical solution can be widely used in the production of rolling bearings when cleaning from finishing pastes after lapping operations and allows you to refuse to use hydrocarbon liquids and detergents when washing.

The invention will improve labor productivity, production culture and eliminate manual labor, and can also be used in repair units.

Bibliography

1. Morozov B.C., Kazakov Yu.M., Taranenko O.I. New effective means for cleaning and degreasing parts and assembly units of rocket and space technology. // ISSN No. 1562-332X. Engineering Technology. 2005. No8.

2. Frolov K.V. and other RF Patent No. 1734886 "Device for cleaning parts." Published on May 23, 1992.

3. Abrashkin A.M. and other RF Patent No. 2024336 "Device for cleaning parts." Published December 15, 1994

Claims (2)

1. Installation for washing precision bearings, containing a washing chamber, activator, vibrodrive, characterized in that the activator mirror is made in the form of alternating rigid annular and retarded shifting elements equidistant from the center. 2. Installation according to claim 1, characterized in that the delay value of the shifting elements of the mirror of the activator is set by changing the diameter of the throttling holes connecting the cavity of these elements with the capacity of the washing chamber.

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