SU891421A1 - Impact action pneumatic machine - Google Patents

Description

(54) PNEUMATIC SHOCK ACTION MACHINE

one

This invention relates to mechanical engineering, in particular, to pneumatic percussion machines, used in engineering, mining, and construction.

A pneumatic percussion machine is known, containing a body with an air supply w, by these channels, a working tool located therein and a spool box with a spool in the form of a glass, and an additional valve 1 installed in it with the possibility of axial movement.

A disadvantage of the known pneumatic percussion machine is that when operating at elevated pressures, when the idle chamber is supplied with compressed air, the spool is activated prematurely, because the air pressure is lower than the inner spool valve. holes in its end wall. This leads to a loss of impact energy.

The aim of the invention is to stabilize the impact energy.

The goal is achieved by the fact that the spool is made with a radial channel in the side wall that communicates with the internal cavity of the spool, and the spool box is made with an annular groove opposite to this channel, constantly connected with the atmosphere and blocked by the side wall of the spool.

FIG. 1 shows the scheme of the car at the time of the start of idling; in fig. 2 - the same at the moment of transferring the spool; in fig. 3 - the same, at the moment of the beginning of the working stroke.

The pneumatic percussion machine consists of body 1, in which

10, the impactor 2 is positioned for axial movement, interacting at the end of the working stroke with the shank 3 of the working tool. The energy carrier (compressed air) is fed into the machine by means of an air distribution device, which includes a valve 4, made in the form of a glass with an end wall and an outer conical surface on the side opposite to the impactor 2 and the radial channel 5 in the side wall.

In the spool 4 is an additional valve 6, made in the form of a cylinder. The spool box is made with an opposite groove 7 opposite to the radial channel 5, which is permanently blocked by the side wall of the valve 4 and through which the space enclosed between the valve 4 and the additional channel 6 constantly communicates with the atmosphere. This eliminates the possibility of network pressure entering the spool chamber. The spool 4 interacts with the bore 8 communicating with the idling chamber 9. The valve 6 communicates with the orifice 10 communicating with the working stroke chamber 11. Compressed air flows from the network into the spool box through the ducts 12. The exhaust is carried out through the opening 13 in the body 1 of the machine. Hole 8 is connected with an idling chamber 9 through channel 14. The pneumatic percussion machine works as follows. In the beginning of the stroke, the hammer 2, the spool 4 and the valve 6 are in the position shown in FIG. 1. Compressed zozdu.h channel 12 enters the spool box and puts pressure on the upper and lower areas of the spool. At the same time, through the opening 8 and the channel 14, the compressed air enters the idle chamber 9 and begins to move the firing pin 2. After the firing pin 2 blocks the exhaust hole 13, the exhaust occurs in the idle chamber 9, and stroke - compression. In the channel 14 and in the cavity above the valve 4, a pressure drop occurs, which causes the valve 4 to move to the position shown in FIG. 2. At the same time, the compressed air stops flowing into the idling chamber 9, i.e. the leakage of air through the exhaust port is stopped. The drummer 2, by inertia, continuing its movement, compresses the airbag, which exerts an impact through the opening 10 on the valve 6. Under the action of the air cushion, the valve 6 will assume the position indicated in FIG. 3

Exhaust

S i

   G Y6

Network

Claims (1)

Fig. 1 In this case, part of the air from the chamber between the valve 6 and the spool 4 is displaced through the radial channel 5 in the spool 4 and the annular groove 7 into the atmosphere. Compressed air through the hole 10 will begin to flow into the working chamber and move the drummer 2 until the impact on the shank 3 of the tool. When the shock 2 opens the exhaust opening into the chamber of working stroke 11, the pressure will fall under the valve 4 and valve 6. Under the action of the mains pressure acting on the conical surface of the spool 4, it, together with the valve 6, will take the initial position (Fig. I). After that, the cycle repeats. Thus, in the pneumatic impacting machine, the impact energy is stabilized, which makes it possible to increase productivity and reduce the consumption of compressed air. Invention Pneumatic percussion machine, comprising a housing with air supply channels, a working tool located in it and a spool box with a spool in the form of a glass, and an additional valve installed in it with the possibility of axial movement, so as to stabilize the impact energy , the spool is made with a radial channel in the side wall that communicates with the internal cavity of the spool, the spool box is made with an annular groove opposite to this channel, p closely communicating with the atmosphere and overlapped by the side wall of the spool. Sources of information taken into account in the examination 1. USSR author's certificate in application No. 2695589, cl. B 25 D 9/00, 1978 (prototype). Exhaust / jxjd 111. tE}  l Network N J