SU1268721A1 - Percussive hydraulic device - Google Patents

Description

126 openly, and part of the RJ enters

discharge line 18. Due to this, valve 13 is in the lower position, blocking the access of the RZh from K 14 to the line 18. When the ZP 21 is closed, the valve 13 moves up, and the RJ stops flowing to K 4. The pressure in K 14 drops and through the pipeline 22, a low pressure wave propagates toward K 4. At the same time, PB 2 begins to accelerate downwards, hit iiHCTpyMeHTy 24 and stop. Pressure VK7 and 15 drops. Valve 13 moves down and the cycle repeats. The device operates in the self-oscillating mode as long as the RFP 21 is closed. 1 Il.

This invention relates to rock breaks, namely, impact devices for breaking rocks. The purpose of the invention is to improve the reliability of the device by eliminating the effect of piston wear and tear on the operation of the distributor. The drawing shows a schematic diagram of the proposed device. The hydraulic percussion device comprises a housing 1, in which a piston-hammer 2 is placed, which forms 4 strokes with the camera body of direct 3 and reverse. In the forward stroke chamber 3, a stroke limiter 5 and an air accumulator 6 are located. A reverse stroke chamber and a Kajyiepa track. 7 are connected by a channel 8, made in jumper 9. The area of the channel B is smaller than the area of the piston surface 10 of the piston –bike 2. The backflow chamber 4 is connected by a channel 11 to the pressure chamber 12 of the distributor housed in the hydraulic device of the percussion device 1 and consisting of the valve 13 forming with the housing I a drain chamber 14, a sub piston control chamber 15 and a sub piston chamber 16, opposite the control chamber 15. Pressure chamber 12 is connected to pressure line 17. Drain chamber 14 is connected to a waste line 18. Nadporshnevaya control chamber 16 is connected by channel 19 to chamber 3 and forward travel to Control piston chamber 15 is connected by channel 20 to tracking chamber 7 and line 18 reset locking device 21. Drain on the chamber 14 is connected with the LH-1 and 18 of the discharge and through the impact pipe 22 with the camera 4 of the reverse. In the chamber 4 of the reverse stroke, the piston-hammer 2 has a piston surface 23. In the lower part of the body there is a working tool 24; The device works as follows. The working fluid through the pressure pipe 17 through the pressure chamber 12 and further along the canal. 1 1 1 enters the backward chamber 4. Through the channel 8 in the bridge 9, the tracking chamber 7 and the channel 20, the working fluid is supplied to the sub-piston control chamber 15. From the chamber 3 of the forward stroke through the channel 19, the liquid enters the supra-piston chamber 16. Under the action of the pressure of the liquid on the piston surface 23, the piston-striker 2 moves to the extreme upper position up to the stop 5 in the housing 1. In the initial position, the locking device 21 is in the open position and, and a part of the liquid from the sub-piston control chamber 15 enters the discharge line 18. In this case, the force acting from the side of the pressure chamber 12 and the sub-piston chamber 16 is greater than s. of the control chamber 15, and the valve 13 is in the lowest position (according to the drawing), blocking the access of liquid from the discharge chamber 14 to the discharge line 18. The percussion device is ready for operation. When the locking device 21 is closed, the pressure in the sub-piston chamber .15 increases and the force acting from the side of this chamber to the valve 13 becomes greater than the sum of the forces acting from the side of the chambers 16 -and 12. The valve -5 begins to move upwards, closing the liquid From the pressure chamber 12 to the return chamber 4 and opening the access of liquid from the drain chamber 14 to the discharge line 18, the pressure in the drain chamber 14 drops sharply and a low pressure wave begins to propagate along the impact pipe 22 towards the reverse chamber 4 . The pressure in the sub-piston control chamber 15 is maintained due to the fact that the percussion piston begins to move downward under the action of a force from the forward stroke chamber, determined by the injection pressure of the pneumatic accumulator 6.

The length of the shock pipeline is chosen so that the low pressure wave approaches the return code chamber 4 only after the fluid access valve 13 from the pressure chamber 12 into the channel 1 1 is completely closed by the valve 13.

In this case, the valve 13 is no longer affected by the force that determines the high pressure of the working fluid in the pressure chamber 12, and the force from the side of the piston-operated control chamber 15 is sufficient to keep the valve 13 in the upper position. The piston piston 2 under the action of the pressure of the fluid in the chamber 3 of the forward stroke begins an accelerated movement downwards.

Since the area of the piston surface 10 is larger than the area of the channel 8, in the follower chamber 7, from which the fluid is displaced into the chamber 4 of the return stroke and further along the impact conduit 22 to discharge, the pressure of the working fluid is kept high, which ensures reliable fixation of the valve 13 - in the extreme upper position during the entire period of the forward stroke. At the end of the forward stroke, the piston head 2 strikes the tool 24 and stops. At the same time, the flow of fluid through the channel 8 stops and the pressure in the tracking chamber 7 drops sharply, which leads to a decrease in pressure in the control chamber 15 connected by the channel 20 with the tracking chamber 7. Under the action of force from the side of the over-piston chamber 16, the valve 13 starts move down, opening the access of fluid from the pressure chamber 12 to the channel 1I and closing the discharge of fluid from the drain chamber 14. But, since the impact pipe 22 has the value of 687214

a distinct length, the pressure in the chamber 4 is reversed only after a period of time, which is necessary so that high-pressure waves propagating through the impact pipe 22 at the speed of sound in this fluid, having reflected from the drain chamber 14, reach chamber 4 backstop. 10 This period of time is sufficient for the valve 13 to move to the lowest position.

In this case, the impact pipe 22 delays the increase in pressure 15 either in the backward chamber 4, and, accordingly, in the piston 15 control chamber, which is necessary for reliable and fast operation of the switchgear. After

When the pressure in chamber 4 is reversed, piston-firing pin 2 begins to move up, idling, compressing the gas in pneumatic accumulator 6.

25

Due to the fact that the area of the piston surface W is greater than the area of the channel 8, the pressure in the tracking chamber 7 and the sub-piston control chamber 15 is kept low, which

30 ensures stable closure of the drain cavity 14. When the piston-bout 2 approaches the stop 5, it stops, which entails a sharp increase in pressure in the tracking chamber

 7, which is transmitted through channel 20 to the control piston chamber 15. The force acting on the valve 13 from the side of the piston-operated control chamber 15 becomes greater than the forces

40 acts on it from the side of the chambers 12 and 16, and the valve 13 begins to move upwards, closing the access of fluid from the pressure chamber 12 in the chamber 4 to the reverse stroke and opening the reset

45 of the liquid from the discharge chamber 14. Due to the presence of the shock conduit 22, the pressure in the return chamber 4 decreases, and consequently, only in the following chamber 7

5 through a period of time determined by the passage of a low pressure wave from the discharge chamber 14 through the impact conduit 22 to the return chamber 4. During this time, valve 13

55 moves to the highest position. The required flow rate in the control piston chamber 15 is ensured by moving

piston-downhill 2 under the action of fluid pressure from the chamber 3 of the forward stroke. After the pressure in chamber 4 is reduced, the piston head 2 begins to make a forward stroke, and the cycle repeats.

The hydraulic percussion device operates in a self-oscillating mode until the dead organ opens. At the same time, at the end of the return stroke of the piston of the hammer 2 in the following chamber 7 and the sub piston control chamber 15, the pressure necessary for switching the distributor does not occur, and the device stops in the initial position.

Claims (1)

The invention of the hydraulic percussion device, comprising a housing forming a forward and reverse chambers with a piston-striker, and a tracking chamber associated with a sub-piston valve control valve having a pressure, drain and aft chamber, differing from that that, in order to increase the reliability of the device by eliminating the effect of piston wear and tear on the operation of the distributor, the tracking chamber is connected to the channel the reversing camera, and the overhead piston control camera communicates with the forward drive chamber, the dispenser drain chamber being connected to the backstop camera shock pipeline.