SU1199934A1 - Percussive pneumatic machine - Google Patents

Abstract

A PNEUMATIC SHOCKING MACHINE, including a housing with a supply and {{}} storeholes, a drummer, an air distribution device, an axially movable sleeve in the form of a glass, which encloses a hammer that forms with the housing and the housing sleeve of the working and idling tunnels a closed housing body. connected to the working chamber by means of holes in the housing and the sleeve, as well as a working tool, in order to increase machine efficiency and improve conditions by reducing vibration, in average hours Parts of the liner in the side wall are made of a command channel for connecting the working chambers with the air distribution device, the inner part of the liner is internal (L annular groove, shorter than the length of the hammer, and an additional valve is installed in the closed chamber.

Description

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The invention relates to mechanical engineering, in particular, to pneumatic percussion machines used in construction, mechanical engineering and other industrial fields for the destruction of various materials and the making of holes.

The purpose of the invention is to improve the efficiency of the machine and improve working conditions by reducing vibration.

The drawing shows a constructive diagram of a pneumatic percussion machine, a slit (in the right part the initial position is shown, and in the left - the position before the beginning of the working stroke).

The proposed pneumatic percussion machine comprises a housing 1 with an air-distributing device 2, feeding channels 3 and 4, and an exhaust port 5. In case 1, there is a drummer 6 separating the housing 1 into a power stroke chamber 7 and a reverse gear chamber 8. A housing 9 is located on the housing 1, which is connected to the working travel chamber 7 by an opening 10 with a check valve 11 having another opening 12 communicating with the working travel chamber 7. In the housing 1, a sleeve 13 is mounted with the possibility of axial movement with an internal protrusion 14 at the end located in the working travel chamber 7. The sleeve 13 encircles the hammer 6. In the side wall of the sleeve there is a supply channel 15 at the end located in the chamber 8 of the return stroke, a coil channel 16 located in the middle part of the sleeve, a connecting channel 17 at the opposite end of the sleeve and an inner annular groove 18 located between the connecting a channel 17 and an inner end surface of the protrusion 14 of the sleeve 13. The distance from the connecting channel 17 to the inner end surface of the protrusion 14 of the sleeve is less than the length of the impactor 6. In the case 1 there is a working tool 19.

The proposed percussion machine works as follows.

At the initial moment, the sleeve 13 is at the bottom, and the drummer 6 is located on the shank of the working tool 19 (half of the right). Compressed air from the network enters the air-distributing device 2 and through channel 3 into chamber B of return. In this case, the sleeve 13

closes the exhaust port 5. Under the action of compressed air, the hammer 6 moves towards the working stroke chamber 7. After the leading edge of the striker 6 passes the command channel 16, the compressed air enters the air distribution device 2 through this channel, which stops the supply of compressed air through the channel 3 to the return chamber 8 and supplies the compressed air to the working chamber 7 through channel 4. At the same time, the striker 6, continuing the initial motion by inertia and due to expansion of the compressed air in the chamber 8, compresses the free air in the chamber 7 of the working stroke, forming an air cushion, the pressure of which together with the pressure is compressed of air from the network over the network. In this case, the check valve 11 is actuated and the overpressure is released into the closed chamber 9 through the opening 10. The hammer 6 stops and changes the direction of movement, making a direct stroke under the action of the compressed air supply. Since the exhaust port 5 is closed, an air cushion is formed in the chamber 8 of the obstruction, which brakes the hammer 6. After the rear edge of the hammer 6 passes the channel 16, compressed air flows through it into the air distribution device 2, which stops the flow of compressed air through the channel 4 to the working stroke chamber 7 and supplies compressed air to the return chamber 8 through the channel 3. The drummer 6 stops and performs the reverse stroke as described, but at the same time it travels a longer way, as it moves under the action of a pulse from the pressure of air and the pulse from the pillow. An increase in the reverse stroke leads to an increase in pressure in the chamber 7 of the stroke, which is again discharged into the closed chamber 9, as well as to an increase in the cushion in the reverse chamber 8. The drummer 6 reciprocates with increasing amplitude until it touches the inner end of the protrusion 14 of the sleeve 13 with its trailing edge and does not move the latter in the axial direction (left half). In this case, the sleeve 13 opens the exhaust hole 5, the connecting channel 17 communicates with the hole

Claims (1)

PNEUMATIC SHOCKING MACHINE, including a housing with supply and complete openings, a hammer, an air distribution device, an axially movable sleeve in the form of a cup, wrapping a hammer that forms a closed chamber in the housing with the housing and the sleeve of the working and idling chamber connected to the working chamber stroke with holes in the case and sleeve, as well as a working tool, which is due to the fact that, in order to increase the efficiency of the machine and improve working conditions by reducing vibration, in the middle part of the liner sidewall command channel configured to connect the working chambers with air diffusers _β predelitelnym device, $ 5 in the upper part of the sleeve formed therein an inner annular groove and a length less than the length of the impactor and in the closed chamber formed further opening [wherein a check valve, 1 1199934 2