SU791849A1 - Percussive-action pneumatic device - Google Patents

Description

(54) PNEUMATIC DEVICE OF SHOCK ACTION

one

The invention relates to construction equipment and can be used to plug flexible core elements into the ground, for example, ground electrodes, anchors, etc.

A pneumatic percussion device is known, comprising a casing, a stepped drummer, in the body of which axial and radial channels are made, a nut with channels for air inlet and outlet, a tube for accommodating a rod element mounted in the impactor channel and fixedly mounted in the casing and a nut, a bore is made on the inner surface of the impactor, which ends behind its radial channel and forms an annular channel with the tube to periodically communicate the idle chamber with the exhaust chamber working stroke 1.

A disadvantage of the known device is the presence in the impactor of the radial channels and annular boring, which significantly reduce the strength and durability of the impactor and the entire device.

It is also known a pneumatic percussion device containing a cor11-.ii.,

a stepped drummer, in the axial channel of which a tube is placed for accommodating an immersed rod element in it, rigidly fixed in the housing and a nut, made with inlet channels

5 and the exhaust air in this case, the channel for periodically communicating the idle chamber with the working stroke chamber is formed by an annular groove, which is provided on the outer surface of the tube 2.

The disadvantage of this device is the presence on the tube experiencing shock loads, annular grooves of considerable length, which leads to premature destruction of the tube and reduces its manufacturability due to distortion and

, 5 leads during heat treatment.

The purpose of the invention is to increase the strength, reliability and durability of a device for driving flexible rod elements into the ground.

This is achieved by the fact that in a pneumatic percussion device containing a hollow cylindrical body, a stepped drummer installed inside it with a through central channel, forming working and idling chambers with air supply channels in them, a clamping device mounted on the body and the through channel of the shock, the latter is installed at one end in a clamping device mounted in the housing with an elastic element, and the channels for supplying air to the chamber are idle a stroke formed by the outer surface of the impactor and formed on the inner surface of the cone longitudinal grooves, between which the side wall of the housing is provided with through holes for air exhaust from idle camera.

In this case, the device can be equipped with a shock absorber installed between the end of the tube and the clamping device.

Fig. 1 schematically shows a pneumatic percussion device with a forward position of the impactor; in fig. 2 - section A-A, in FIG. one; (on the exhaust holes made in the device); in fig. 3 is the same (an embodiment of the device with exhaust holes made in the tube).

The device (Fig. 1) consists of a housing 1, a stepped drummer 2 placed in the housing 1, a nut 3 covering the internal cavity of the housing 1, a tube 4 and a clamping device 5 connected to the housing 1 through the elastic element 6.

. On the inner cylindrical surface of the housing 1, longitudinal grooves 7 are made. The grooves 7 with a larger drummer 2 form channels 8 for supplying compressed air to the idling chamber 9 formed between the housing 1, the clamping device 5, and the front part of the drummer 2.

Less cylindrical stage drummer 2 forms with the housing 1 and the nut 3 camera 10 working stroke. Between the inner and outer cylindrical surfaces of the nut 3 and the tube 4, a cavity 11 is formed, which is connected to the atmosphere by the holes 12.

The holes 13, made between the longitudinal grooves 7 in the side wall of the housing 1, serve to periodically connect the idling chamber 9 with the atmosphere.

The nut 3 has a channel 14 for supplying compressed air supplied by the hose 15, which is attached to the nut 3 by means of a sleeve 16.

A through tube 4, placed in the central axial channel of the drummer 2, is rigidly fixed with a rear end (right in the drawing) in nut 3 and is installed with a front end in clamping device 5, moreover between the front end of tube 4 and

The clamping device 5 has a shock absorber 17.

The clamping device 5 serves to connect the percussion device to the submersible element 18.

FIG. 2 shows a cross-section of the housing 1, the striker 2, the tube 4 and the hammer element 18 through the exhaust holes 13 formed between the longitudinal slots 7 of the housing 1 forming with the impactor 2 channels 8 for supplying compressed air to

idle chamber.

In the second embodiment, the percussion device exhaust air from the idle chamber 9 is carried out through the windows 19, made in the tube 4.

FIG. 3 shows a section of the housing 1,

drummer 2, tube 4 and hammer element 18 through the exhaust ports 19, made in tube 4.

FIG. 3 shows channels 8 for supplying compressed air to the idle chamber 9

0 moves.

The device works as follows.

The driven rod 18 is passed through the tube 4, and then fixed to it with the aid of the clamping device 5.

Compressed air through the hose 15 and the channel 14 enters the chamber 10 of the working stroke and the channels 8 into the chamber 9 of idling. Since the area of the impactor 2, which is experiencing pressure of compressed air from the side of chamber 9, is larger than the area of impactor 2, which is experiencing pressure of compressed air from the side of chamber 10, the impactor 2 begins to move backwards (in Fig. 1 - to the right), making idling.

 After the channels 8 overlap with the cylindrical surface of the greater stage of the striker 2, the flow of compressed air into the idle chamber 9 stops, but the striker 2 continues to move to the right due to

0 energy of compressed air expanding in the chamber 9.

At the end of the no-load stroke of the striker 2, the cylindrical surface of its larger stage opens the exhaust windows 13 and the exhaust of air from the chamber 9 occurs.

5 After this, the striker 2 stops and, under the action of compressed air in chamber 10, begins to move forward and strikes jaw 5. Next, the described cycle repeats.

 In the second embodiment of the percussion device, the compressed air from the idle chamber 9 is discharged through the exhaust ports 19 in the tube 4 when they reach the leading edge of the percussion piston 2 moving to the right.

Under the action of impacts, the flexible rod 18 connected to the percussion device through the clamping device 5 is immersed in the ground. After mouth

Claims (2)

Claim 1. Pneumatic impact device containing a hollow cylindrical body 10, a step drum mounted inside it with a through central channel, a nut with channels for supplying and exhausting air, forming chambers for working and idling with channels for supplying air to them, mounted on the housing, the clamping device and the tube placed in the through channel of the hammer, characterized in that, in order to increase the strength, reliability and durability of the device, the tube is installed at one end in the clamping device a lance mounted in the housing by means of an elastic element, and the channels for supplying air to the idle chamber are formed by the outer surface of the hammer and longitudinal grooves made by the internal surface of the housing, between which through holes are made in the side wall of the housing for exhausting air from the idling chamber. 2. The device according to π. 1, characterized in that it is equipped with a shock absorber installed between the end of the tube and the clamping device.