SU750054A1 - Pneumatic percussive machine - Google Patents

Description

(54) / PNEUMATIC BREAKER MACHINE

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The invention relates to the field of the mining industry, namely to pneumatic impact machines.

A drilling device is known which includes a housing and a vibration damping device 1.

However, this device does not effectively dampen vibrations.

The closest technical solution is a pneumatic impact machine, which includes a vibration-damper, an integral body with a supplying vibration-insulating chamber located in its rear part, a percussion mechanism, the body of which is movably placed inside a vibration-noise protective body made in the form of a frame formed by front and rear flanges, rigidly connected rods mi, on which the soundproof casing is reinforced 2.

However, this machine does not allow to increase the effectiveness of vibration protection by automatically changing the recoil force depending on the feed force.

The purpose of the invention is to increase the effectiveness of vibration protection by automatically changing the recoil force of the air impact machine, depending on the feed force.

This is achieved by the fact that the pneumatic impact machine has an element designed to regulate the supply of compressed air from the vibration-insulating chamber to the percussion mechanism, depending on the supply force, made in the form of a conical sleeve, the smaller base of which is attached to the end wall of the rear flange of the vibration-noise protective body. with the part skipped into the cavity of the body of the percussion mechanism.

The invention is illustrated in the drawing.

A pneumatic impact machine consists of a casing 1 of a percussion mechanism, movably placed inside a vibration-noise protective casing, having a frame structure. The frame of the vibration-protective housing is formed by the front 2 and rear 3 flanges, rigidly connected rods 4. The rear flange is provided with a guide bushing 5, into which the shank 6 of the impactor case enters its outer cylindrical surface.

In the same flange there is a starting valve 7 and a supplying vibration-insulating chamber 8, inside which a taper bushing 9 is installed at the entrance to the internal cavity of the shank of the casing of the percussion mechanism, with a large diameter part of the casing of the percussion mechanism. A smaller diameter taper sleeve is attached to the end wall of the rear flange.

The housing of the percussion mechanism has a bracket 11 with sliding sleeves 12, through which the rods of the housing pass. Vibration-proof springs are attached to these rods. Front vibration springs 13 are located between the front flange and the brackets.

Pneumatic shock machine (perforator) works as follows. Compressed air from the line through the starting valve 7 enters the supply vibration-proof chamber 8 and then through an adjustable slot formed by the outer surface of the conical sleeve 9 and the bore 10 of the shank of the percussion mechanism body enters the percussion mechanism. The feed force Q, which is applied to the anti-vibration body, is transmitted to the body 1 of the percussion mechanism mainly through the air cushion of the vibration-insulating chamber 8.

If the supply force Q is greater than the compressed air pressure force in the vibration-insulating chamber 8, the vibration-noise casing moves forward and excess force Q above RI transfers the impact mechanism case 1 through the brackets 11 back springs 14. At the same time, the taper sleeve 9 opens the entrance to the bore 10 of the shank. the larger cross-section of the slit, the greater the movement of the vibration-damping body relative to the body of the percussion mechanism, i.e. the greater the excess force supply Q over force RI. The pressure of compressed air in the inner cavity of the shank 6 of the body of the percussion mechanism increases and the pressure and the amount of compressed air entering the percussion mechanism increase.

If the feed force Q is less than the force R j, the vibration-noise protective body moves back. The front springs 13 are compressed, unloading the body of the percussion mechanism, and the conical sleeve 9, the outlet of the shank 6, blocks the flow area of the slot. The smaller the feed force Q, the greater the overlap of this section. In the inner cavity of the shank 6, the pressure of compressed air drops, and the pressure also decreases.

and the amount of air entering the impact mechanism.

With an appropriate choice of the angle of inclination of the sleeve cone, depending on the movement of the vibration-protective casing — relative to the body of the percussion mechanism, which is determined by the magnitude of the supply force, a change in pressure occurs both in the internal cavity of the percussion mechanism shank and the pressure of compressed air entering the impact} 1st mechanism whose values ultimately determine the recoil force. Moreover, it is very important that the amount of compressed air that is necessary for the output from the perforator to the bottom of the impacting power corresponding to a certain amount enters the impact mechanism.

feed effort.

Claims (2)

Invention Formula A shockwave, comprising a vibration-noise protective housing, with a supplying vibration-proofing chamber placed in its rear part, an impact mechanism, the housing of which is movably placed inside the vibration-protective protection body, made in the form of a frame formed by front and rear flanges, rigidly connected rods, on which a noise-protective casing is fixed , characterized in that, in order to increase the effectiveness of vibration protection by automatically changing the recoil force of the pneumatic impact machine, depending on the feeding force, it has An instrument designed to regulate the supply of compressed air from the vibration-insulating chamber to the percussion mechanism depending on the supply force, made in the form of a conical bushing, the smaller base of which is attached to the end wall of the rear flange of the shield casing, and extending into the cavity of the shock body mechanism. Sources of information taken into account in the examination 1. USSR Author's Certificate Co 183160, cl. E 22 C 19/00, B 25 D 17/24, 1961. 2. USSR author's certificate No. 380831, cl. E 21 C 3/24, E 21 C 5/06, 1971 (prototype).