SU1408031A1 - Pneumatic percussive device - Google Patents

Abstract

The invention relates to percussion devices and can be used for clogging housings for trenchless laying of underground utilities and pipes. The aim of the invention is to increase the convenience of operation by providing the possibility of reversal. The pneumatic percussion device contains an additional chamber 20 communicated with a pressure source and a backstop chamber 13 through the locking devices 21 and 22. When the auxiliary chamber 20 is communicated, previously charged with compressed gas from the pressure source through the locking device 22, the reverse gear chamber 13 through . The device 21 increases the gas volume on the side of the end surface 14 of the greater stage 3, which allows the piston of the hammer 2 to be thrown before it hits the back wall 6, i.e. to reverse the device. 1 il. about

Description

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The invention relates to percussion devices and can be used for clogging housings for trenchless laying of underground utilities.

The purpose of the invention is to increase the convenience of operation by providing the possibility of reversing,

The drawing shows a percussion device, a longitudinal section.

The device includes a housing 1, a stepped piston-hammer 2, having a greater 3 and a smaller 4 stages, placed by a larger stage 3 between the front 5 and rear walls of the housing 1, and a lower stage 4 in the bore made in the rear wall 6 of the housing 1 and forming three chambers with housing 1 - a chamber 7 of direct travel, located between the end surface 8 of the lower stage 4 of the impact piston 2 and the bottom of the bore and communicated with a source of compressed gas, the exhaust chamber 9 located between the annular surface of the piston Yu -shock 2 and back wall 6 housing 1, connected by channels 11, made in the rear wall 6 of housing 1, with the atmosphere and having an annular boring 12 on the lateral C1 “1” drift surface, backstop chamber 13, located between the end surface 14 of the greater stage 3 and the front wall 5 of housing 1 and having an annular groove 15 on the lateral cylindrical surface, an air supply duct 16, made in the body of the piston of the impactor 2, communicated by the entrance with the forward running chamber 7 and having an outlet 17 located on the cylindrical surface of the larger piston stage 3 Rnika 2, exhaust channel 18 in the body of the piston of the impactor 2, communicated with the reverse gear chamber 13 and equipped with an outlet 19, located on the cylindrical surface of the larger stage 3 of the piston impactor 2, an additional chamber 20 communicated with the return gear 13 and with a pressure source through the locking devices 21 and 22,

The device works as follows.

The compressed gas is supplied to the chamber 7 of the forward stroke, from which it is directed through the air supply channel 16 to the reverse chamber 13 In connection

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Since the area of the end surface 14 of the higher stage 3 of the piston-impactor 2 is larger than the area of the end surface 8 of the lower stage 4, a force appears on the piston-impactor 2, under the action of which the piston-impactor 2 moves towards the rear wall 6, moving the impacting piston 2, the exit 17 of the channel 16 is blocked and the access of the compressed gas to the backstop is stopped. Upon further movement of the impact piston 2, the outlet 19 of the exhaust channel 18 is connected through an annular bore .12 with the exhaust chamber 9 and the gas from the reverse chamber 13 is released through the channels 11 to the atmosphere, while the gas pressure in the reverse stroke chamber 13 decreases.

Under the action of gas pressure in the chamber 7 of the forward stroke, the piston-impactor 2 moves towards the front wall 5 until it hits it. At this time, the outlet 17 of the channel 16 communicates with the return chamber 13 through the annular groove 15 and the compressed gas is directed to this chamber. Further, the process is repeated and thereby provides a forward stroke mode, aimed at driving an object, such as a pipe, into the ground.

In order to carry out the reverse, for example, to detach the impactor from the object being driven, the locking device 21 opens, an additional chamber 20, previously charged with a compressed gas from the pressure source through the locking device 22, communicates with the reverse gear 13. This increases the volume of compressed gas acting on the front surface 14 of the greater stage 3 of the piston of the impactor 2, which leads to a more intensive casting of the piston of the impactor 2 and its impact on the rear wall 6.

In order to deliver a single strike with a piston-impactor 2, the back wall 6 of the backstop chamber 13 is communicated with the pressure source through the locking devices 21 and 22,

Claims (1)

Invention Formula A pneumatic percussion device, comprising a housing with an internal cavity, a step piston-impactor, having a larger and smaller steps placed in a larger step in the inner cavity between the front and rear walls of the housing, and a small step in the bore made in the rear wall of the housing, and the three chambers with the housing are a forward running camera located between the end surface of the smaller piston-impact piston stage and the bottom of the bore and associated with a source of compressed gas, an exhaust chamber located between the annular surface of the impactor piston and the rear wall of the housing, connected by channels formed in the rear wall of the housing, with the atmosphere and having ntsuyu annular bore on the lateral cylindrical surface flyback chamber disposed between the end wall and a greater degree front wall of the housing and having an annular groove on the lateral cylindrical surface, an air supply channel made in the body of the piston; and, communicated by the entrance to the forward running chamber and having an output, located on the cylindrical surface of a larger piston-impactor stage, the exhaust channel is filled in the body of the impact piston, inlet with the return camera and having an outlet located on the cylindrical surface of the larger impact piston, it is so that, in order to increase the convenience of operation by reversing capabilities, the device is equipped with an additional camera communicating with the backstop camera and with a pressure source through the locking devices.