SU1765382A1 - Hydraulic impact-action device - Google Patents

Abstract

Usage: A hydraulic percussion device can be used as a manual hydraulic hammer as well as a hydraulic hammer for drilling machines destroying coal and rocks. The essence of the invention is a hydraulic percussion device that includes a body in which the cup and the head are coaxially move. In the striker placed a check valve and throttle. The dowel forms with a plunger a charging chamber which is connected by a channel through a check valve and the throttle is connected to a backstop chamber which is permanently connected to the pressure line. The area of the piston surface of the plunger placed in the charging chamber is less than the surface area of its part located in the forward stroke chamber. 1 silt

Description

FIELD OF THE INVENTION The invention relates to mining and can be used as a percussion device of drilling machines, as well as chipping mortars in the construction and coal industry.

A hydraulic percussion device is known, the disadvantages of which are a large number of valve and spool valves, which are used to switch the distribution elements of the inertia control system. This reduces the reliability of the device as a whole, as well as the use of working fluids with viscosities close to the viscosity of water due to the occurrence of large leaks in spool seals.

The closest in technical essence is a hydraulic mechanism of percussive action, the disadvantage of which is low impact energy. This is due to the fact that before the impact the impact body interacts with the elements of the switchgear, as a result of which a significant portion of

The purpose of the invention is to increase the impact energy and reliability of the device operation, due to switching the switchgear to a position that ensures the backward stroke of the striker, only after the striker strikes the tool

This is achieved by the fact that the hydraulic percussion device comprises a housing with protrusions on the inner surface and radial channels for supplying and discharging fluid, placed in the cavities of the housing of a hammer located coaxially with the last plunger and glass forming having piles on the outer and inner surfaces to interact respectively with the protrusions of the housing and the plunger, a part of which is located in the working stroke chamber of the impactor, the return chamber stroke impactor permanently bonded to the pressure magistsl

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In this case, the upper part of the striker is placed with the possibility of axial movement in the cavity of the glass, the plunger being installed in the striker and forming with the latter a charging chamber hydraulically connected by means of the throttles and non-return valve to the backstop chamber, and less surface area of its part located in the forward stroke chamber.

The drawing shows a schematic diagram of a hydraulic device of percussive action.

The device includes a housing 1, in which a cup 2 and a drummer 3 are coaxially arranged, forming with the housing 1 a forward stroke 4. In the drummer 3, a check valve 5 and a throttle 6 are placed. through the check valve 5 and the throttle 6 is connected to the back-up chamber 10. The back-up chamber 10 is connected to the pressure line 11 through the pressure opening 12. The glass 2 has shoulders 13 and 14. The glass hole 15 connects the forward stroke camera 4 to the high chamber pressure 16. The plunger 7 has a protrusion 17 for interlocking odeystvi with collar 13. The chamber 18 is coupled to the return line 19.

The operation of the device is as follows.

Suppose that in the initial position the beaker 2, the striker 3 and the plunger 7 are in the lower position. Then, the forward stroke chamber 4 is connected to the chamber 18 and the drain line 19. When fluid is supplied under pressure to the pressure line 11, it flows through the pressure opening 12 into the backward chamber 10. Through the check valve 5 and the throttle 6, the fluid enters channel 9. the charging chamber 8. The drummer 3 and the plunger 7 begin to move upwards relative to the housing 1, and the plunger 7 moves also relative to the striker 3. The glass 2 is held in the lower position by the forces acting on the valve 14 from the high pressure chamber 16. Moving upwards, drummer 3 influences Bust 13 and raises the glass 2 up. Burt 14, moving relative to the protrusion in the housing 1, allows the working fluid from the high pressure chamber 16 to enter the forward passage 4 chamber through the openings 15. The nozzle 2 blocks access of the fluid into the chamber 18 and the drain line 19. The pressure in the forward stroke 4 increases to the pressure in the pressure line 11. The force acting on the firing pin from the chamber

stroke 4, becomes greater than the force acting on it from the side of the reverse gear chamber 10, and drummer 3 begins to make a forward stroke and strikes.

The liquid from the charging chamber 8 is displaced by the plunger 7 through the channel 9 through the throttle 6 into the backstop chamber. The forces acting on the plunger 7 from the camera side of the forward stroke 4 are larger than from the side of the charging chamber 8, since the piston area of the protrusion 17 of the plunger 7 is greater than the piston area of the plunger rod 7 in the charging chamber 8. The plunger 7 moves down and after striking a blow

3 protrusion 17 of the plunger 7 sits on the collet 13 of the cup 2. The plunger 7 moves the cup 2 to the lower position. The protrusion 14 blocks the access of the working fluid from the high pressure chamber 16 to the forward stroke chamber.

At the same time, liquid is opened to drain from the forward stroke chamber 4 and the cycle is repeated.

Thus, before striking a striker on the tool, there is no mechanical interaction between the striker and the fixed elements of the switchgear, which ensures full transfer of energy to the striking working tool, and reduces the dynamic loads on the elements.

distribution system, which increases the reliability of the device.

Claims (1)

The formula was invented and Hydraulic percussion device, comprising a housing with protrusions on the inner surface and the radial channels for supplying and draining the fluid, the hammer is located in the cavity of the housing, the plunger and the cup located coaxially with the latter the casing wall of the chamber of high and low pressure and having piles on the outer and inner surfaces to interact respectively with the protrusions of the casing and the plunger, a part of which is housed in the chamber the stroke of the striker, characterized in that, in order to increase the impact energy and the reliability of the device, in the case of the latter, a backstop chamber is permanently connected to the pressure line an impactor, the upper part of which is placed with the possibility of axial movement in the cavity of the glass, while the plunger is installed in the impactor and forms with the latter a charging chamber hydraulically connected with the reverse chamber stroke, and the piston surface area of the plunger placed in the charging chamber is less than the surface area of its part placed in the forward stroke chamber /