SU697649A2 - Percussive device for making holes in soil - Google Patents

Description

I

The invention relates to percussion devices and can be used to form wells in the ground during the laying of underground utilities, as well as for driving dowels, electrodes, grounding, horizontal and vertical pipes.

The main author's certificate No. 496350 describes a pneumatic percussion device for the formation of wells in the ground, consisting of. housing, which has a stepped drummer with radial, axial and longitudinal channels, with the front and rear cameras communicating with each other through a channel having exits to the front and cylindrical surfaces of the drummer.

A disadvantage of the known device is the low efficiency, due to the presence of a significant detrimental volume of the anterior chamber, which determines the flow of compressed air.

The purpose of the present invention is to determine the efficiency of the device.

For this, the devices are provided with a bushing installed between the hammer and the casing, on which the stops limiting the displacement of the bushing are made.

FIG. 1 - the device in the position corresponding to the beginning of the return stroke; in fig. 2 - device in the position cboi corresponding to the beginning of the forward stroke.

Claims (1)

The device consists of a housing 1, inside of which a stepped drummer 2, nuts 3 and a movable sleeve 4 mounted between the drummer 2 and the housing 1 are mounted so that the frictional force between the sleeve 4 and the impact of Nick 2 is significantly greater than the gap between the sleeve 4 and the case 1 Case 1 is made with stops 5 and 6, which are the limiter of the stroke of the movable sleeve 4. The drummer 2 is equipped with an axial 7, radial 8 and longitudinal channel 9. The nose part of the drummer 2 forms, with the case 1, the front working chamber 10, the internal nut surface 3 forms with a drummer 2 ass Yu working chamber 11, nut 3 provided with holes 12 for air discharge into the atmosphere. Compressed air is supplied to the device through a hose 13. The device operates as follows. In the position of shock 2, corresponding to the beginning of the return stroke, its radial channel 8 extends beyond the front edge of sleeve 4, which is fixed in this position by upbrom 5, and channel 9 is blocked by the inner surface of sleeve 4. Compressed air is fed through hose 13 to the rear working chamber 11 and through channels 7 and 8 - to the front working chamber 10. Rear working chamber 11 is constantly under the network of compressed air. Since the front working area of the striker 2 is larger than the rear, then under the action of compressed air entering the front working chamber 10, it moves backward. The strength of the friction between the hammer 2 and the sleeve 4 is greater, what the force of the friction between sleeve 4 and the housing 1 is the device. Therefore, the sleeve 4 begins to move backwards together with the drummer 2, At the specified distance from the beginning of the reverse, the sleeve rests on the support 6, and drummer 2, sliding relative to hub 4, continues to move. In this case, its channel, 8, is blocked by the inner surface of sleeve 4. Further movement of the striker 2 is carried out due to the energy of the expanding air. At the end of the return stroke, channel 9 is covered by the rear edge of sleeve 4 and through channel 9, the air outlet 12 chambers 10 to the atmosphere Drummer 2 is braked by the network pressure of compressed air in the rear to the measure. After stopping under the action of compressed air, the drummer starts moving forward. Since the strength of the friction between the drummer and the sleeve 4 is greater than that between the drummer 2 and the body 1, the sleeve 4 begins to move forward together with the drummer 2. In this case, channel 9 communicates the front working chamber with atmoofer. The darnik moves without counterpressure of the air in the front working chamber, 10. At a given distance from the start of the npsaMoro stroke, the hub 4 stops with an emphasis 5, and the striker 2 continues forward movement. Channels 8 and 9 overlap the inner surface of sleeve 4. In this part of the course, air is compressed in the front chamber. At the end of the forward stroke of the striker, channel 8 extends beyond the front edge of sleeve 4 and through channels 7 and 8 the compressed air flows into the front working air. camera Yu, Drummer 2 hits the body 1 ,. slaughtering it in the ground. In the following, the cycle repeats. Pneumatic device. Impact action for the formation of wells in the ground according to the author's certificate No. 496350, characterized in that, in order to increase the efficiency of the device, it is equipped with a sleeve installed between the impact of the INSERT and the case on which the stops restraining the movement of the sleeve are fitted. 6 7 FIG. 2 // 7 / 7Ш / 7 / Ш777Л / / / 7