RU2009874C1 - Air-operated percussion machine - Google Patents

Abstract

FIELD: mechanical engineering, building. SUBSTANCE: air-operated percussion machine has hollow housing 1, stepped shank 4 with air delivery rod 3 both of them being located in housing 1, piston 6 associated with shank 4, and valve 9. Piston 6 is made in the form of sleeve with axial hole in bottom. It is pivotally connected with shank 4 in the area of shank step 3 of the least diameter. Valve 9 is mounted on end face of step 3 of shank with a capability of periodical closing axial hole 7 in sleeve bottom. This design ensures reduced consumption of compressed air. EFFECT: improved efficiency. 3 dwg

Description

 The invention relates to pneumatic impact machines, namely to rammers, jack hammers, concrete breakers, etc., which are used in construction, mining and other industries.

 A pneumatic impact machine is known, in which, in order to simplify the design, the valve of the air distribution device is made in the form of a sleeve mounted with the possibility of axial movement and forming axial and radial calibrated gaps with a shock step piston, the last of which is connected to the cavity of the shock step piston.

 Its disadvantages are increased consumption of compressed air, low productivity.

 The purpose of the invention is to increase productivity by reducing the consumption of compressed air.

 The pneumatic impact machine comprises a hollow body, a stepwise shank with an air supply channel, a piston and a valve associated with it, arranged longitudinally therein. The piston is made in the form of a cup with an axial hole in the bottom, its connection with the shank is made by means of a swivel in the area of the step of a smaller diameter of the shank. The valve is installed at the end of the step of a smaller diameter of the shank with the possibility of periodic overlapping of the axial hole of the bottom of the glass.

 In FIG. 1 shows a pneumatic machine at idle, a longitudinal section; in FIG. 2 - part of the machine during the working stroke; in FIG. 3 - embodiment of a machine with a shock piston.

 The pneumatic impact machine comprises a hollow body 1 with a cavity 2, a step shank 4 with a small step 3 with an air supply channel 5, a piston 6 and a valve 9 connected thereto, longitudinally moving, the piston 6 is made in the form of a glass with an axial hole 7 in the bottom, its connection with the shank 4 is made by means of a swivel (axis 8) in the area of the step 3 of a smaller diameter of the shank, and the valve 9 is installed on the end of the step 3 of a smaller diameter of the shank with the possibility of periodic overlapping axial hole 7 of the bottom of the glass.

 Pneumatic impact machine operates as follows.

 When you turn on the machine, compressed air through the air supply channel 5, holes 10, calibrated gaps - axial 11 and radial 12 - enters the upper part of the cavity 2. Under pressure, the housing 1 starts to move upward from the impactors.

 After the holes 14 are blocked by the piston 6 in the lower part of the cavity 2, compression of the air cut off in it and an increase in its pressure begin. After the piston 6 passes through the holes 14 from the upper part of the cavity 2, the exhaust of exhaust air starts and the pressure in it drops to atmospheric.

 Under the action of increased pressure from below, the piston 6, valve 9 are moved to the upper extreme position, while the upper part of the cavity 2 is isolated from the source of compressed air. Compressed air through the gaps - axial 11 and radial 15 - hole 7 begins to flow into the lower part of the cavity 2.

 Under the action of increased pressure, the housing 1 with the striker 12 begins to move down. After the opening of the hole 14 with the piston 6 in the upper part of the cavity 2, the compression of the air cut off in it begins and its pressure increases. After the piston 6 passes through the holes 14 from the lower part of the cavity 2, the exhaust of exhaust compressed air begins and the pressure in it drops to atmospheric.

 Under the action of increased pressure from above, the piston 6, valve 9 are moved to the lower extreme position, while the lower part of the cavity 2 is isolated from the source of compressed air. Around the same time, drummer 13 hits. Further, the described process is repeated.

 The swivel joint of moving parts provides a snug fit of the contacting surfaces, reducing the consumption of compressed air and productive work of the machine. (56) Copyright certificate of the USSR N 1391872, cl. B 25 D 17/00, 1986.

Claims (1)

 A PNEUMATIC SHOCK ACTION MACHINE containing a hollow housing, a step shank with an air supply channel placed therein with the possibility of longitudinal movement, a piston and a valve connected with it, characterized in that, in order to increase productivity by reducing the consumption of compressed air, with an axial hole in the bottom, its connection with the shank is carried out by means of a swivel joint in the area of the step of a smaller diameter of the shank, and the valve is mounted on the end of the step of a smaller diameter of ostovik with the possibility of periodic overlapping of the axial opening of the bottom of the glass.

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