SU742545A1 - Percussive device for making holes in soil - Google Patents

Description

It creates a backpressure that reduces the energy and frequency of impacts.

The purpose of the invention is to reduce energy consumption and increase the efficiency of the device.

To achieve this goal, a screw-shaped groove is made on the surface of the sleeve for engagement with the protrusion projection, inlet and exhaust ports. The projection of the striker can be made in the form of a spring-loaded pin. At the same time, protrusions are made on the inner surface of the body, and longitudinal grooves on the outer surface of the striker for engagement with said body projections.

FIG. Figure 1 shows schematically a pneumatic percussion device with the striker in the forward position; in fig. 2 shows section A-A in FIG. one; in fig. 3 given a scan of the cylindrical part of the sleeve (arrows indicate the relative movement of the pin along the screw groove of the sleeve); in fig. 4 shows a section BB in FIG. 3; in fig. 5 shows a section B-B in FIG. 3; ka fig. b - section GGD in FIG. 3

The device (Fig. 1) comprises a housing 1, a drummer 2, an air inlet 3, a sleeve 4 and a nut 5.

The air inlet port 3 has inlet b and exhaust 7 channels, as well as inlet 8, 9, 10 and exhaust 11, 12, 13 windows. The drummer 2 also has windows 14 and 15, and the sleeve 4 has windows 16, 17, 18, 19 and a screw-shaped groove 20. Compressed air is supplied through a hose 21. In the housing 1 There are protrusions 22 placed in the external longitudinal grooves 23 of the drummer 2.

The housing 1 and the front part of the drummer 2 form an idling chamber 24. The internal cavity of the drummer 2 and the end surface of the sleeve 4 will form the middle osemere 25. The front surface of the drummer 2, the sleeve 4, the nut 5 and the body 1 form the working chamber 26.

In the drummer 2 (see Fig. 2) installed spring-loaded pin 27, placed in the screw groove 20 of the sleeve 4.

The helical groove 20 (see FIG. 3) has three parts — with the left cutting direction 28, with the cutting right direction 29 and the inclined part 30. The .28 and 29 parts of the screw groove 20 have a variable depth. The window 17 for admitting air to the chamber 24 has the same elevation angle as part of the screw groove 28, and the exhaust window 16 has the same elevation angle as part of the screw groove 29.

The device works as follows.

In the position of the hammer 2 shown in FIG. 1, the compressed air through the channel 6 and through the windows 9, 17, 14 enters the chamber 24. The middle chamber 25

through the windows 18, 13, and the chamber 26 through the windows 19, 11 are connected to the exhaust channel 7 of the nozzle 3 (Fig. 4). At the same time, drummer 2 begins to move to the left, making an idling. The pin 27, moving together with the hammer 2 and interacting with the screw groove 28 (FIG. 3), begins to turn the sleeve 4 clockwise (as viewed along the direction of the drummer).

When overlapping the edge of the window 14 of the striker 2, the window 17 of the sleeve 4, the inlet into the chamber 24 is cut off and the movement of the striker 2 further occurs due to the drying of air in it and the inertia of the striker 2.

At a different position of the striker 2, the exhaust from the front chamber 24 and the air inlet into the chamber 26 and the sreny chamber 25 proceed. Next, the impactor 2 moves only by inertia and stops due to the pressure of compressed air in the chambers 25, 26 in the extreme rear position on the nut 5.

In this case, the pin 27 (cm, fig.Z dotted) slips into the part of the screw groove 29, having the right direction of cutting. The drummer 2 may have an overrun, however, the angle of rotation of the sleeve 4 does not change as the pin 27 will move along the non-inclined part of the screw groove 30.

At the extreme rearward position of the striker 2, the sleeve 4 is rotated by 180 ° relative to the initial position. In this case, the compressed air through the windows 8, 19 enters the chamber 26 and through the windows 10, 18 into the middle 25 camera. The camera 24 through the windows 15, 16, 12 communicates with the exhaust duct 7.

Thus, the entire end face of the firing pin 2 is under the influence of compressed air and the firing pin 2 starts to move to the left, making a forward stroke. In this case, the pin 27, interacting with the screw pussm 29, turns the sleeve 4 in the same direction as before. Then the inlet to the chamber 26 and the middle 25 chamber is stopped and then the movement of the striker 2 occurs due to the expansion of air in them and the inertia of the striker 2.

After the compressed air has been injected into the chamber 24 and the exhaust from the chamber 26 and the middle chamber 25, the drummer 2 moves to the left only by inertia and strikes the body 1.

At the moment of impact, the device returns to its original state and the cycle repeats.

Claims (3)

Claim 1. A percussion device for the formation of wells in the ground, comprising a housing in which a hammer is installed, provided with a central channel, windows and a protrusion, an air inlet pipe having inlet and exhaust channels and windows and a sleeve mounted thereon, characterized in that reducing energy consumption and efficiency of the device on the surface of the sleeve is made of a screw shaped groove for interaction with the protrusion of the striker, and in its body inlet and exhaust ports. 2. The device POP.1, characterized in that the drummer is made as a spring-loaded pin. 3. Device POP.1, characterized in that on the inner surface of the body there are made protrusions, and on the outer surface of the striker - longitudinal grooves for interaction with said protrusions of the body. Information sources, Q taken into account in the examination 1. USSR author's certificate 2464403, cl. E 02 F 5/16, 1967. 2. USSR author's certificate 328240, cl. E 02 F 15/18, 1969.  :) e i / 5 / 2 ////////////// Fi.5 YYY-T - y Fig.b V 206