A device for punching holes in the ground

 

The invention relates to mining and construction equipment and is intended for trenchless laying of underground utilities. The device includes a body placed therein and dividing the cavity on the front and back camera drummer with a through longitudinal channel, boring with diffusers which form a continuously connected with the atmosphere of the inner chamber. The diffuser is made in the form of two coaxial tubes, the inner of which has a radial channels separated from each other by a crosspiece, and a sleeve placed with a possibility of axial displacement of the inner coaxial tube. The latter is constantly communicated with the line of compressed air. The sleeve is made boring, the front face of which is in the extreme forward position of the striker is adjacent to the rear edge of the radial channel of the inner coaxial tube, constantly communicated with the through longitudinal channel drummer. The sleeve is made of two parts connected with each other via the elastic element. Improved reliability and performance. 1 C. p. F.-ly, 1 Il.

The invention relates to the fees a device for punching holes in the ground (see A. C. the USSR №1308718, E 02 F 5/18, publ. in BI No. 17, 1987), including housing, are accommodated in the housing and dividing the cavity on the front and back camera drummer with a through longitudinal channel and a bore, the air containing the sleeve from the exhaust channel connected to the main compressed air, and a pipe with a radial channels provided in the sleeve bore with the possibility of axial displacement between the firing pin and the sleeve.

A disadvantage of the known technical solution is the complexity of the design, which reduces reliability. Also, due to jamming of the tube during movement of the device in heterogeneous soils, limited impact power for small diameters of the housing with which the most effective process of making holes in the ground.

The closest in technical essence and the achieved effect is a device for punching holes in the ground (see and. C. the USSR №1562411, E 02 F 5/18, publ. in BI No. 17, 1990), including housing, are accommodated in the housing and dividing the cavity at the front and rear cameras and constantly associated with atmosphere the internal chamber drummer with a through longitudinal channel, the distributor in the form of two coaxial tubes with radial Cana is istruly compressed air. In the cavity between the radial channels made jumper. Inner chamber formed in the body of the striker bore, made concentric relative to the coaxial tubes of the distributor.

A disadvantage of the known technical solution is the complexity of the design, due to the necessity of simultaneous base bushings on the inner and outer coaxial tubes of the distributor. In addition, in the known technical solution of the transfer sleeve with the direct course of the striker is due to the impact on her drummer or a hook. These drawbacks reduce the reliability of the device and does not allow us to effectively implement known technical solution for small diameters buildings, for which the most effective drilling of wells in the pound, as the deformation of the device during its movement in heterogeneous soils will inevitably lead to jamming of the sleeve.

The technical problem to be solved by the proposed device is to increase reliability by simplifying the design and eliminate the possibility of jamming of the sleeve of the air terminal unit when the device movement in heterogeneous soils, and HC is the camera does not occur backpressure, the inhibitory drummer, increasing the energy of a single shock pulse and reduce the pressure loss of the compressed air in the rear chamber due to contamination him to an inner chamber.

The problem is solved in that the device for punching holes in the soil, including housing, are accommodated in the housing and dividing the cavity on the front and back camera drummer with a through longitudinal channel, boring with diffusers which form a continuously connected with the atmosphere of the inner chamber, and the diffuser is made in the form of two coaxial tubes, the inner of which has a radial channels separated from each other by a crosspiece, and a sleeve placed with the possibility of axial displacement at a specified inner coaxial tube and mainline compressed air, which is constantly communicated to the inner coaxial tube air according to the proposed technical solution, in the hub of the diffuser is made boring, the front face of which is in the extreme forward position of the striker is adjacent to the rear edge of the radial channel of the specified inner coaxial tube, constantly communicated with through the longitudinal channel of the striker, when the element.

Significant differences of the proposed technical solutions are as follows:

- in the sleeve of the air terminal unit (hereinafter sleeve) made boring, the front face of which is in the extreme forward position of the striker is adjacent to the rear edge of the radial channel of the specified inner coaxial tube, constantly communicated with the through longitudinal channel drummer.

This solution simplifies the design of the diffuser increases the reliability, efficiency and performance of the device. The sleeve is based only on the outer surface of the inner coaxial tube diffuser, allowing reduces the loss of compressed air pressure in the rear chamber of partecke him to an inner chamber, eliminates the possibility of jamming of the specified sleeve during operation and significantly reduced requirements for precision parts manufacturing device. Compressed air is supplied into the sleeve directly from the inner coaxial tube air bypassing the rear camera, resulting in a cross-section of the inner coaxial tube has a minimum size to ensure the passage of compressed air, which increases the energy of the single rear edge of the radial channel of the specified inner coaxial tube, constantly communicated with the through longitudinal channel drummer, throughout the forward stroke of the striker in the anterior chamber does not occur back pressure, which increases energy and blow frequency drummer, and, consequently, the performance of the device.

- sleeve diffuser is made of two parts connected with each other via the elastic element.

This increases the reliability of the work of this sleeve by eliminating transmitting hard impact loads from the side of the drummer.

It is advisable inner coaxial tube diffuser set in its outer tube, with the possibility of axial displacement.

This allows you to perform the reverse of the device to return it to the mouth of the borehole when drilling blind holes or when meeting with an insurmountable obstacle that extends the application of the device.

The essence of the technical solution is illustrated by the specific example of implementation, a description of the operation of the device and the drawing, which presents a schematic diagram of a device for punching holes in the ground.

A device for punching holes in the ground includes a housing 1, a drummer 2 having a through longitudinal channel 3, the diffuser 4,the coaxial tube 6. The sleeve 7 of the diffuser 4 has a bore 8 and consists of two parts: the front 9 with slots for the passage of air, and the rear 10 connected with each other via the elastic element 11. Drummer 2 has means 12 engagement with the front part 9 of the said sleeve 7. The inner coaxial tube 6 of the diffuser 4 has a radial channels 13 and 14, separated from each other by a crosspiece 15, and the rear part of the tube 6 is constantly communicated with the line 16 for supplying compressed air, and the front part is included in the channel 3 of the striker 2. The inner coaxial tube 6 of the diffuser 4 is fixed at its outer coaxial tube 5 with a thread 17. Boring drummer 2 forms with diffusers 4 internal chamber 18, is constantly communicated with the atmosphere. Rear camera 19 is constantly communicated through the channel 20 of the diffuser 4 highway 16 compressed air. Drummer 2 and the housing 1 to form a front chamber 21.

The device operates as follows.

At the front position of the striker 2 (see drawing) the compressed air from line 16 compressed air through the inner coaxial tube 6 of the diffuser 4, the radial channels 13, the bore 8, the radial channels 14 and SC is the area, and the area of the striker 2 from the front camera 21 more space at the rear of the camera 19, the striker 2 begins to move back. After displacement of the striker 2, the distance L1 he end of its bore begins to shift the sleeve 7 of the distributor 4. After the offset of the specified sleeve 7 on the distance L2 radial channels 14 are communicated with the inner chamber 18, is the exhaust in the anterior chamber 21 of the air in the atmosphere, after which the air pressure in the rear chamber 19 drummer 2 stops in its rearmost position. Then begins his direct course, which ends with a striking front end of the body 1, the sleeve 7 of the diffuser 4 is displaced by inertia in the direction of the front end of the body 1, the opening of the radial channels 14 into the cavity of the bore 8. For L1 in the direct course of the striker 2 front camera 21 via the radial channels 14 of the inner coaxial tube 6 of the diffuser 4 is communicated with the atmosphere, resulting in the anterior chamber 21 does not occur back pressure, the braking drummer 2.

At site L1 drummer 2 moves due to the filling of the anterior chamber 21 with compressed air (the air pressure in the anterior chamber 21 differs little from the pressure gathogo air in the anterior chamber 21. This achieves the highest performance and efficiency of the device.

For reversing device must be offset in the axial direction of the inner coaxial tube 6 of the diffuser 4. The reverse mechanism is a screw pair. Rotation highway 16 this tube 6 may be installed at the front or rear position corresponding to the forward or return stroke of the device.

The air intake in the front chamber 21 when the device is in the "Reverse" is earlier than the "Straight path", the striker 2 is stopped by the pressure of compressed air in said chamber 21, without striking the housing 1. The exhaust air is later, therefore, when the movement of the striker 2 ago he strikes the rear end of the body 1 under the action of which the device returns to the wellhead.

Thus, the base sleeve 7 only on one surface, excluding transmission on the sleeve 7 hard bumps when moving the striker 2, the absence of back pressure in the anterior chamber 21 with the direct course of the striker 2 and ensuring its return stroke due to the constant filling of the anterior chamber 21 main compressed air increases the reliability of astroo for punching holes in the ground, includes case, accommodated in the housing and dividing the cavity on the front and back camera drummer with a through longitudinal channel, boring with diffusers which form a continuously connected with the atmosphere of the inner chamber, and the diffuser is made in the form of two coaxial tubes, the inner of which has a radial channels separated from each other by a crosspiece, and a sleeve placed with the possibility of axial displacement at a specified inner coaxial tube and mainline compressed air, which is constantly communicated to the inner coaxial tube diffuser, characterized in that the bushing diffuser made boring, the front face of which is in the extreme forward position of the striker is adjacent to the rear edge of the radial channel of the specified inner coaxial tube, constantly communicated with the through longitudinal channel drummer, and the bushing diffuser is made of two parts connected with each other via the elastic element.

2. The device under item 1, characterized in that the inner coaxial tube diffuser is installed in its outer tube for axial offset is

 

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SUBSTANCE: a reciprocating striker is positioned in the casing of the pneumatic percussion mechanism. The air-distributing system of the mechanism includes the front and rear working chambers, inlet and exhaust valves and a fixture for closing and opening of the exhaust channels made in the form of a spring-loaded end face stopper coupled to a tractive member. At actuation of the pneumatic percussion mechanism, before the supply of compressed air, the exhaust channels are closed, they are opened after the inner cavities of the pneumatic percussion mechanism are filled with compressed air.

EFFECT: provided automatic cyclic action of the pneumatic percussion mechanism.

3 cl, 3 dwg

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