SU861598A1 - Gas-dynamic chuck - Google Patents

Description

(54) GASDANAMIC CARTRIDGE

I

The invention relates to mining, and more specifically to devices that destroy NIN of soils, rocks and coal compressed gas ;. high pressure.

pneumatic cartridges are known that use compressed air with pressure up to several hundred atmospheres, accumulated in the working and auxiliary chambers separated by a spool and exhaust ports 03

Known pneumo cartridge containing the working and auxiliary chambers, separated by a spool and exhaust ports. In the process of filling the working chamber with air, the spool closes the exhaust openings and seals the cavity of the working chamber due to 1 stroke with a stop ring D.

 This pneumatic cartridge is characterized by frequent, after about 1000 cycles, replacement of the retaining ring due to the fact that the contact surface is deformed. when returning the spool with spring force.

The aim of the invention is to noaiMe; the term of the service.

This goal is achieved by the fact that a cylindrical protrusion is made on the spool, the dimensions of which are determined; 1 out of relationship

;, ", B / q XO, 5-,

where - the height of the cylindrical protrusion; a is the distance between stubborn

ring and edge of the nearest exhaust port; i is the length of the spool braking section.

Claims (2)

The drawing schematically shows the proposed gas-dynamic cartridge. The cartridge includes a housing 1, an auxiliary chamber 2, a working chamber 3, a spool 4, an anvil ring 5, exhaust ports 6, gas cavities 7, the spool 4 is provided with a cylindrical protrusion height, and an anvil ring 5 is separated from the nearest edge of the exhaust vents by the value of the spool braking area is a c. The device works as follows. When filling the working chamber 3 with compressed gas, the spool 4 closes the exhaust ports 6 of the cartridge. The process of pulsed flow of compressed gas from the working chamber begins with the valve being transferred and from opening the exhaust ports. After a significant part of the gas has flowed out of the working chamber of the cartridge by the spring force or gas pressure, the spool returns to its initial state at a certain speed. On the length of the braking area of the cavity 7, a gas is contained in itself — a piston with an abutting ring that presses the piston. The braking efficiency, the zone, is both pumped, if it maintains the ratios, b / d, 5 ,; gas is throttled on sliding surfaces. We propose a gas shock absorber to increase the service life of the pair: spool - retaining ring several times and 8 can be used in all designs of gas-dynamic cartridges. The claims of the gas-dynamic cartridge, including the body, the working and auxiliary chambers, separated by a chimney, and the exhaust ports, are also distinguished by the fact that, in order to increase the service life, on the spool, a central protrusion, the dimensions of which are determined from the ratios B / d, 57 where KdcoTa is a cylindrical protrusion; the distance between the stop ring and the edge of the nearest exhaust port; - length y icTKa braking spool. Sources of information taken into account in the examination of t. Adamidze D.Ch. Destruction of coal and rocks by compressed air. M., Science, 1978, p. 12. , 2. USSR author's certificate {130454, cl. E 21 C 37/08, 1959 (prototype).