Method for actuation of pneumatic percussion mechanism and device for its realization

FIELD: construction, applicable for trenchless laying and replacement of underground pipe-lines.

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

 

The present invention relates to the field of construction equipment and relates to methods and devices for trenchless installation and replacement of underground pipelines.

The known method of start-up air device, as described in 924276, including compressed air vozduhoprovodyaschih the hose line inside the device. The compressed air acts on the starting valve and when the pressure reaches the rated value, it is opened, compressed air is supplied to the working chamber and launches drummer. During operation the valve is open due to the influence of compressed air. In the case of low pressure or disconnect the unit from the main line valve is shifted by the spring to its original position and the device stops. The device consists of a body placed in it, with the possibility of reciprocation of the striker, diffuser, rear nut exhaust channels for the passage of exhaust air. To a lesser degree air distributor has a spring-loaded trigger valve.

The disadvantage of this method and of the device is its low reliability. When the pressure decrease below a certain limit, or off-highway machine stops, due to the fact that one of the provisions of the valve "open" is fixed is by providing compressed air, supplied to the device. As a result, the chances of loss mechanism or holding a large amount of excavation work on removing it.

There is a method of running a pneumatic percussion, known from the utility model certificate on No. 13219, including the use of starting valve, also triggered from the main compressed air pressure. The device comprises a hollow body placed in it a drummer, performing under the action of compressed air, reciprocating, air, performing alternate supply of compressed air in one or the other chamber, placed on its smaller scale starting valve and the back nut from the exhaust channels for the passage of exhaust air. The valve operates from compressed air supplied from vozduhoprovodyaschih highway. Its structure is made from two-stage bushing mounted on the distributor by means of a spring, covering two-part lesser degree air with a through transverse channels in its speed and partition between the transverse channels. This design provides stable operation in case of a minor (about 2 MPa) of pressure fluctuations in the network (here and below we mean not absolute, but excess is offered pressure).

The technical problem solved by this invention is to improve the reliability of the device's launch even in extreme situations.

The problem is solved in that during the start-up air devices for installation and replacement of underground pipelines, including the feed duct compressed air and exhaust through the exhaust channels, before applying compressed air to produce closing of the exhaust channels, which open after filling with compressed air internal cavities of the device. This order of operations, you can directly launch device to cause movement of the striker in the moment when the working chamber is already filled with compressed air, it is only necessary to open the exhaust channels. The starting device can be provided even when the length vozduhoprovodyaschih hoses (over 100 m) and the pressure in the pipeline less than nominal.

It is advisable to open the exhaust channels to produce by mechanical means, for example by means of a cable. This allows the force fixing the opening and closing of channels, regardless of the pressure in the network, which increases the reliability of starting and maintaining operation. It also allows you to use the winch and pass significant efforts at virtually any distance from the working pits.

Suitable for carrying out the method to use air device for installation and replacement of underground pipelines, comprising a hollow body, placed in it the drummer with the possibility of reciprocation, the distribution system with the inlet and exhaust channels, and to provide it with means for closing and opening the exhaust channel, made for example in the form of a spring-loaded end cap connected to the traction body. This will allow simple constructive means guaranteed to perform the operation of opening and closing Windows, regardless of the distance of the device from the input and output of the pits and from changes in pressure in the air supply.

The present invention illustrada the following drawings:

Figure 1 presents a diagram of the device.

Figure 2 - the device with the exhaust forward.

Figure 3 - device with the exhaust back into work.

The method is implemented as follows.

The device 1 is installed in the input sump (not shown) and the front of the connecting cable 2 with traction body (not shown). The cable 2 previously passed through the old pipe 3 or the pre-formed leader well. Back to the unit 1 attach the new pipe 4, in which missing air manifold 5, the soybean is inanny with a compressor (not shown). When compressed air in the exhaust device channel 6, facing in the direction of drilling of the borehole (figure 1), is closed with an end closure 8, provided with a spring 7 which is connected to the cable 2, therefore, is filling the cavities of the device with compressed air. When filling of the working chambers 11 and 12 with compressed air drummer 10 is slowly moved from the positions shown in figure 1, to the rear position (figure 2) due to the fact that the working area of the striker 10 from the side of the camera 11 is greater than that of the camera 12, and opens the exhaust channel 9. But because channel 6 is closed, the exhaust does not occur, the device does not start. Then cable tension 2 compresses the spring 7 and through the end cap 8 dramatically open up the exhaust channel 6. Because open channel 9, is the exhaust from the chamber 11, the striker 10 by the pressure of the air in the chamber 12 accelerates forward and strikes at the front of the housing 1 of the device. Before kick drummer 10 open window 13 and the inlet into the chamber 11. Then the cycle repeats.

Under the action of the shock body 1 of the device is moved forward, destroying the old pipe 3, presses it remains in the soil forms in it well and pulls it attached to the tail portion of the new pipe 4.

In the case when the device is performed with the exhaust channel 6, is placed in the rear part of the device (figure 3), tor the Wake of the plug 8, provided with a spring 7 and connected to the cable 15, closes the channel 6. At slow flow of air through the channels 13, 14 slowly filled chamber 12, 11 and (gaps) camera 17. Due to the fact that the drummer 10 are efforts on the part of all three cameras, movement of the striker 10 is not happening. After the tension of the rope 15 is compressed spring 7, the cover 8 opens the channel 6. There is a sharp exhaust compressed air from the chamber 17 through the channels 6 and 16 to the atmosphere. Now the drummer 10 are efforts on the part of the cameras 11 and 12. As a working area by the camera 11 is greater than that of the camera 12, the striker 10 sharply begins to move back up until the channels 13 will not connect the camera 11 with the chamber 17. The compressed air from the chambers 11 and 17 on channels 6 and 16 being released into the atmosphere. The pressure in the chamber 12 a drummer first 10 stops in the rear position, and then accelerates forward and strikes to the body 1 of the device. Shortly before impact channels 13 connect the camera 11 and 12. Then the cycle repeats. Under the action of shock the device moves, destroying the old pipe 3 and tightening 4.

Using the proposed method and device for its implementation allows the use of pneumatic devices for installation and replacement of pipes in the ground for a considerable length of the borehole without performing intermediate pits. Also ranovitsa possible to perform trenchless construction and replacement of underground pipelines in those cases, when laying or replacing pipe is pre-welded to a length of 100-200 m whip. In this case, it is required to ensure reliable starting of the device at great length vozduhoprovodyaschih hose.

Use with front or rear exhaust allows the use of this method for laying water pipes of almost any diameter and length.

1. The way of start-up air device for the trenchless installation and replacement of underground pipelines, including the submission to the device via the air duct compressed air and exhaust through the exhaust channels, characterized in that before the supply of compressed air to produce closing of the exhaust channels, which open after filling with compressed air internal air cavities of the device.

2. The method according to claim 1, characterized in that the opening of the exhaust channels produced by mechanical means, for example by means of a cable.

3. Air percussion device for installation and replacement of underground piping according to claim 1, including a hollow body placed in it the drummer with the possibility of reciprocation, the distribution system, including front and rear working chambers, inlet and exhaust channels, characterized in that it is provided with a means for closing the opening of the exhaust channel, performed, for example, in the form of a spring-loaded end cap connected to the traction body.



 

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FIELD: construction, applicable for trenchless laying and replacement of underground pipe-lines.

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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