SU987221A1 - Pneumatic vibration exciter - Google Patents

Description

(54) PNEUMATIC VIBRATOR

one

The invention relates to vibration devices using compressed air and can be used as a drive for transport and technological devices, such as vibratory feeders for discharging bulk materials from containers, knocking out grates in the foundry industry, vibrating plates for forming concrete products, concentration tables, vibratory grinders - everywhere where it is necessary to control the force and amplitude of the vibration exciter depending on the varying external load. Such devices are used in the mining, mechanical engineering, mineral processing and other industries.

A pneumatic vibration exciter is known, comprising a base, a movable element, forming with the base at least one chamber in communication with a source of compressed air and the atmosphere, and a hollow ring valve of elastic material, mounted in the chamber to form external and internal cavities, fixed on the base and forming with the latter at least one permanently closed chamber communicated with a source of compressed air ClJ "The disadvantage of the known device is that the frequency control is connected down efficacies and limited technical capabilities of the compressor.

The purpose of the invention is the expansion of the adjustment range.

The goal is achieved by the fact that the external cavity is communicated with a compressed air source, and the exhaust ports are made at the contact point.

15 movable element and ring valve.

The drawing shows schematically a pneumatic vibrovoz.boditel.

The vibration exciter comprises a base 1, a movable element 2, a chamber 3, communicated with a source 4 of compressed air, an elastic ring valve 5 installed with the formation of an external cavity 6 and an internal band 25 of 7, a closed chamber 8 communicated with a source 9 of compressed air, source 10 compressed air, exhaust ports 11, ring 12.

11 exhaust ports are located

Claims (3)

30 in the oscillating element 2, in the zone of its interaction with g valve 5, so that the valve closes them in the lower position of the oscillating element 2. - The oscillating element 2 is connected to the base 1 by a ring 12 of elastic material, which excludes the radial mobility of the oscillating element 2 and hermetically seals the outer cavity 6. 6. In addition, for sub-. The guiding element 2 can be introduced guides (not shown in the drawing). The closed valve chamber 8 is connected to a higher pressure source 9 in order to prevent the valve from depressing 5 pressure) with in-chamber 3. Between the base 1 and the element 2 can be installed shock absorbers. Cavities 6 and 7 have different working areas. In the zone of interaction with the oscillating element 2, the valve 5 can be made of a more durable material or with elastic reinforcement. The valve can be made in several parts. W. Browser works as follows. To bring the vibration exciter into operation, it is necessary to fill the subvalve chamber 8 with a certain volume of compressed air. The valve 5 rises up to the stop into the oscillating element and closes the apertures 11. Then the compressed air from the source 4 leads into the cavity 7 with a smaller working area, and the cavity 6 can be connected to the atmosphere. The oscillating element 2 moves up and behind it. Valve 5 follows a certain height. After the elastic tension of the ring valve 5 and the pressure in chamber B is balanced, the lift of valve 5 stops, the oscillating element 2 is detached from valve 5, opens exhaust outlets-. 11. The pressure in cavity 7 decreases sharply, oscillating element 2 under the action of weight falls on base 1 and presses valve 5, pressure in it rises to the main one, the cycle is repeated. If the working area of the cavity 7 is not enough to provide the necessary force of the vibration exciter and the amplitude of oscillation, then the source 10 of the compressed air is connected to the cavity 6, and the cavity 7 communicates with the atmosphere. If this is not enough, then cavities b and 7 are connected to a source of compressed air. In addition, smooth amplitude remote control is possible by varying the pressure of the compressed air in chamber 8. Thus, the force of the vibration exciter is controlled by changing the working area of the oscillating element 2, which is affected by the compressed air. Due to this, the compressor and the vibration exciter operate in a mode close to optimal. The proposed design allows reducing the compressed air consumption, eliminating unnecessary dynamic loads, expanding the field of application of powerful pneumatic vibration excitators. Claim of the invention: A pneumatic vibration exciter comprising a base, a movable element forming at least one chamber with a base and an atmosphere hollow annular valve of elastic material, mounted in the chamber with the formation of external and internal cavities, fixed on the base and forming with the latter at least one permanently closed chamber in communication with a source of compressed air, characterized in that, in order to expand the control range, the external cavity communicates with a source of compressed air, and the exhaust ports are made at the Contact Point of the moving element and the ring valve. Sources of information taken into account during examination 1, USSR Author's Certificate for Application 2955391 / 25-06, cl. F 15 B 21/12, 07/16/80.