WO2017222210A1

WO2017222210A1 - Hydraulic impact device

Info

Publication number: WO2017222210A1
Application number: PCT/KR2017/005856
Authority: WO
Inventors: 강영기; 조재상
Original assignee: 주식회사수산중공업
Priority date: 2016-06-21
Filing date: 2017-06-05
Publication date: 2017-12-28
Also published as: KR101805038B1

Abstract

The present invention relates to a hydraulic impact device and, more particularly, to a hydraulic impact device capable of automatically switching an impact stroke in accordance with a state of bed rock in the ground and, when the impact stroke is performed, preventing a no-load impact to prevent breakage of a piston and a load chamber.

Description

Hydraulic blow device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic striking device, and more particularly, to a hydraulic striking device mounted on construction equipment such as an excavator and hitting a rod by descending a piston, thereby breaking the rock on the ground.

Hydraulic striking device is a device that is installed in construction equipment such as excavator, loader, etc. to crush rock or concrete, and when the cylinder is operated, the piston descends to strike the rod, which is the crushing tool, and the rod is the concrete and rock of the ground. The impact is applied to the shredding object, for example, to achieve shredding.

The hydraulic striking device can adjust the striking force applied to the rod according to the position of the top dead center of the piston, and the striking force adjustment as described above can be made in two striking strokes. In other words, the stroke stroke of the hydraulic striking device has a relatively high top dead center, such as a long-stroke stroke that strikes the rod strongly, and a short-stroke that strikes the rod weakly by having a relatively low top dead center. ) Can be divided into administrations. Such a long stroke is effective when crushing the soil which is composed mainly of Gangam, and the short stroke is effective when crushing the soil which is mainly composed by soft rock.

Therefore, according to the condition of the rock of the ground, a hydraulic striking device that can be converted to the above-described striking stroke, that is, a long stroke or a single stroke stroke, has been developed, and as such a hydraulic striking device described in Korean Patent No. 10-1072069 Is open to the public.

The breaker of Korea Patent Registration No. 10-1072069 selects and rotates one of the smashing display portion, the weakness display portion, and the anti-striking display portion of the breaker installed on the outside of the cylinder of the breaker and controlling the hitting force. Through the blow control valve, the blow rod of the breaker can not be struck by the piston, and can selectively perform the struck and weak action.

However, the breaker of the Korean Patent No. 10-1072069 only has to rotate the direction changer, the force control valve is to block the anti-violation pipe or slugging conversion pipe can be performed in the struck or weakened mode. Therefore, when crushing the rock of the ground with a breaker, the user directly grasps the state of the rock and rotates the direction change unit, so that the struck or weak stroke may be performed, thus reducing the efficiency of the work and the inconvenience of use. have.

In addition, even in the case of the non-battery mode that prevents the breaker of the breaker, it can be performed only by rotating the direction changer, it is not possible to use the non-battery mode in parallel with the struck or weakened mode. Therefore, when a breaker executes the smashing or weakening mode to ground the rock, the piston is operated with the striking rod spaced from the ground, or if the ground is a soft ground, the breaking of the breaker may occur. There is a problem that the piston and the cylinder are damaged.

The present invention has been made to solve the above-described problem, it is possible to automatically switch the stroke stroke according to the state of the rock of the ground, to prevent breakage of the piston and the load chamber by preventing the blow stroke when performing the stroke stroke It is an object of the present invention to provide a hydraulic striking device that can be used.

Hydraulic striking device according to one aspect of the invention the cylinder; A piston installed in the cylinder to move up and down; An upper chamber provided above and a lower chamber provided below between the piston and the cylinder; A piston control valve for controlling the lifting operation of the piston; A striking force regulating valve controlling an operation time of the piston control valve; A rock strength sensing valve controlling an operation time of the striking force control valve; And a return flow path for returning the piston control valve to a pre-operation position by communicating the connection flow path for operating the piston control valve with the low pressure line.

The apparatus may further include a first connection flow path connecting the piston control valve and the striking force control valve, wherein the return flow path includes: an intermediate chamber formed between the piston and the cylinder; A fifth connection passage connecting the intermediate chamber and the striking force control valve; And a fourth flow passage connecting the outlet port through which the working oil flows out of the cylinder and the intermediate chamber, wherein the working oil of the first connection flow passage is at the bottom dead center of the piston through the striking force control valve and the return flow passage. It is characterized in that the communication with the low pressure line.

In addition, the piston control valve, the upper surface of the upper body is pressed by the operating oil; The lower surface is pressed by the working oil, the protrusion formed on the side of the upper body; And a lower body pressurized by the operating oil and a lower body formed under the upper body, wherein the hydraulic area of the upper surface of the upper body is greater than the hydraulic area of the lower surface of the protrusion, It is characterized in that less than the sum of the hydraulic area of the lower surface of the lower body.

The striking force control valve may include a rotary valve, and a striking force control valve flow path formed inside the striking force control valve. The striking force control valve flow path may include a high pressure line and a low pressure line according to the rotation of the striking force control valve. It is characterized by communicating.

According to the hydraulic striking device of the present invention as described above, there are the following effects.

According to the condition of the rock of the ground can automatically achieve the conversion of the stroke stroke.

The stroke can be prevented when the stroke is performed, and thus, the piston can be prevented even when the piston is operated while the rod of the hydraulic striking device is separated from the ground, or when the soft ground is crushed. Breakage of the load chamber can be prevented.

1 is a longitudinal sectional view showing a hydraulic striking device according to a preferred embodiment of the present invention.

2 is a longitudinal sectional view showing that the piston control valve and the piston of the hydraulic striking device of FIG. 1 are in different operating positions.

3 is a longitudinal sectional view showing that the piston of the hydraulic striking device of FIG. 2 is in another operating position;

4 is a longitudinal sectional view showing that the piston control valve and the piston of the hydraulic striking device of FIG. 3 are in different operating positions.

5 is a longitudinal sectional view showing that the piston of the hydraulic striking device of FIG. 3 is in another operating position;

FIG. 6 is a longitudinal sectional view showing rock strength detection valves of the hydraulic striking device of FIG. 5 in different operating positions. FIG.

7 is a longitudinal sectional view showing the rock strength detection valve and the piston control valve of the hydraulic striking device of FIG. 6 in different operating positions.

FIG. 8 is a longitudinal sectional view showing that the piston control valve and the striking force regulating valve of the hydraulic striking device of FIG. 7 are in different operating positions. FIG.

9 is a longitudinal sectional view showing that the piston of the hydraulic striking device of FIG. 8 is in another operating position;

10 is a longitudinal sectional view showing that the piston of the hydraulic striking device of FIG. 9 is in another operating position;

FIG. 11 is a longitudinal sectional view showing that the piston control valve and the striking force regulating valve of the hydraulic striking device of FIG. 10 are in different operating positions.

12 is a longitudinal sectional view showing an operating position when the hydraulic striking device according to the preferred embodiment of the present invention executes the anti-ballout mode.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a longitudinal cross-sectional view showing a hydraulic striking device according to a preferred embodiment of the present invention, Figure 2 is a longitudinal cross-sectional view showing that the piston control valve and the piston of the hydraulic striking device of Figure 1 in different operating positions, 3 is a longitudinal cross-sectional view showing the piston of the hydraulic striking device of FIG. 2 in different operating positions, and FIG. 4 is a longitudinal cross-sectional view showing the piston control valve and the piston of the hydraulic striking device of FIG. 3 in different operating positions. 5 is a longitudinal sectional view showing that the piston of the hydraulic striking device of FIG. 3 is in a different operating position, and FIG. 6 is a longitudinal sectional view showing a rock strength detection valve of the hydraulic striking device of FIG. 5 in another operating position. 7 is a longitudinal sectional view showing that the rock strength detection valve and the piston control valve of the hydraulic striking device of FIG. 6 are in different operating positions, and FIG. Figure 10 is a longitudinal sectional view showing the piston control valve and the striking force control valve in different operating positions, Figure 9 is a longitudinal sectional view showing that the piston of the hydraulic striking device of Figure 8 is in a different operating position, Figure 10 is a FIG. 11 is a longitudinal sectional view showing that the piston of the hydraulic striking device is in different operating positions, FIG. 11 is a longitudinal sectional view showing that the piston control valve and the striking force regulating valve of the hydraulic striking device of FIG. 10 are in different operating positions, and FIG. Is a longitudinal sectional view showing an operating position when the hydraulic striking device according to the preferred embodiment of the present invention executes the anti-ballout mode.

Hydraulic striking device 10 according to a preferred embodiment of the present invention, as shown in Figures 1 to 4, the cylinder 100, the piston 200 is installed to be lowered in the cylinder 100, An upper chamber 114 provided at the upper part between the piston 200 and the cylinder 100, a lower chamber 112 provided at the lower part between the piston 200 and the cylinder, and an intermediate part between the piston 200 and the cylinder. The lower chamber 112, which is provided in the piston control valve 310 for controlling the lifting and lowering operation of the piston 200, the striking force control valve 330 for controlling the operation timing of the piston control valve 310, and the striking force A rock strength detection valve 350 for controlling the operation timing of the control valve 330 and a connection flow path for operating the piston control valve 310 communicate with the low pressure line to return the piston control valve 310 to the pre-operation position. It comprises a return flow path.

Hereinafter, the cylinder 100 is demonstrated.

The cylinder 100 has an inlet 410 through which hydraulic fluid flows in and an outlet 420 through which hydraulic fluid flows out.

The inlet 410 is connected to a high pressure line through which hydraulic oil is supplied by a pump (not shown), and the outlet 420 is connected to a low pressure line through which hydraulic oil is sucked by a sump (not shown). In addition, the high pressure line and the low pressure line are connected to each other from the outside of the hydraulic striking device 100, thereby, the high pressure line and the low pressure line and the inside of the cylinder forms a hydraulic circuit.

Therefore, when the pump is operated, the working oil is introduced into the cylinder 100 through the high pressure line and the inlet 410, in which case the working oil is supplied at a high pressure. In addition, the hydraulic oil in a high pressure state is discharged to the outside of the cylinder 100 through the outlet 420 and the low pressure line through the flow paths and / or connecting flow paths to be described later, in this case, the hydraulic oil is sucked in a low pressure state.

Inside the cylinder 100, a third chamber in which the piston 200 is installed, a second chamber 120 in which the piston control valve 310 is installed, and a third force adjusting valve 330 are installed. The chamber 130, the fourth chamber 140 in which the rock strength detection valve 350 is installed, and the accumulator 160 in which nitrogen gas is filled are formed.

Hereinafter, the first chamber 110 will be described.

The first chamber 110 is an annular space in which the piston 200 is installed to move up and down, and includes a load chamber 111 in which a rod 700 is installed, and a lower chamber located above the load chamber 111. 112, the intermediate chamber 113 positioned above the lower chamber 112, the upper chamber 114 positioned above the intermediate chamber 113, and the buffer chamber 115 positioned above the upper chamber 114. It is configured to include.

The load chamber 111 refers to a space forming a lowermost part of the first chamber 110, and a load 700 is installed in the load chamber 111 so as to be lowered and lowered under the load chamber 111.

The lower chamber 112 is positioned above the load chamber 111 and refers to a space formed by the lower portion of the lower step 210 of the piston 200 and the interior of the cylinder 100, that is, the first chamber 110. do.

The lower chamber 112 serves to elevate the piston 200 to the upper portion by the inflow of high pressure hydraulic fluid. Each of the six connection passages 660 is connected to the third chamber 130.

The intermediate chamber 113 is positioned above the lower chamber 112, and is formed between the upper and lower step portions 210 of the piston 200 and inside the cylinder 100, that is, by the first chamber 110. Refers to space.

The intermediate chamber 113 forms a return flow path together with the fifth connection flow path 650 and the fourth flow path 540 which will be described later, and a detailed description thereof will be described later.

The upper chamber 114 is positioned above the intermediate chamber 113 and refers to a space formed by an upper portion of the upper step 220 of the piston 200 and an interior of the cylinder 100, that is, the first chamber 110. do.

The upper chamber 114 serves to lower the piston 200 by the inflow of high pressure hydraulic fluid, and is connected to the upper space of the second chamber 120 to be described later by the second connection flow path 620.

The buffer chamber 115 refers to a space that forms the top of the first chamber 110. Nitrogen gas is filled in the buffer chamber 115.

Nitrogen gas filled in the buffer chamber 115 serves as a buffer to prevent the raised piston 200 from touching the upper portion of the buffer chamber 115, and at the same time, the piston 200 is moved downward by the gas pressure of the nitrogen gas. By pushing out serves to help the lowering of the piston (200).

Hereinafter, the second chamber 120 will be described.

The piston control valve 310 is installed inside the second chamber 120, and the piston control valve 310 is moved up and down inside the second chamber 120 by the working oil, thereby connecting to the second chamber 120. Open and close them.

The second chamber 120 includes an upper space and a lower space, and the diameter of the upper space of the second chamber 120 is greater than the diameter of the lower space of the second chamber 120.

In this case, the diameter of the upper space of the second chamber 120 has the same size as the diameter of the protrusion 312 of the piston control valve 310 to be described later, the diameter of the lower space of the second chamber 120 will be described later. It has the same size as the diameter of the lower body 313 of the piston control valve 310.

Therefore, the upper body 311 of the piston control valve 310 to be described later is located in the upper space of the second chamber 120, the lower body 313 is located in the lower space of the second chamber 120.

In addition, the height of the lower space of the second chamber 120 is formed smaller than the height of the lower body 313. Therefore, as shown in FIG. 1, when the piston control valve 310 is not operated, the lower surface of the lower body 313 comes into contact with the lower portion of the lower space of the second chamber 120. On the other hand, the lower surface of the protrusion 312 does not touch the lower portion of the upper space of the second chamber 120, and thus, the separation space is disposed between the lower surface of the protrusion 312 and the lower portion of the upper space of the second chamber 120. Will be formed.

The upper space of the second chamber 120 (or the piston control valve 310 is connected to the inlet 410 by the second flow path 520 and the 2-1 flow path 521, the second flow path 520) And it is connected to the inlet 410 by the second channel 522, and is connected to the outlet 420 by the fifth channel 550 and the fifth channel 551. In addition, the second chamber ( The upper space of the 120 (or the piston control valve 310) is connected to the upper chamber 114 by the second connection flow path 620, the second connection flow path 620 and the second-first connection flow path 621. It is connected to the fourth chamber 140 by the).

The lower space (or the piston control valve 310) of the second chamber 120 is connected to the third chamber 130 by the first connection passage 610 and the third connection passage 630, respectively, and the fourth It is connected to the fourth chamber 140 by the connection passage 640.

Hereinafter, the third chamber 130 will be described.

A striking force control valve 330 is installed inside the third chamber 130, and the striking force control valve 330 is moved up and down in the third chamber 130 by the hydraulic fluid, thereby connecting to the third chamber 130. Open and close them.

In this case, a spring 131 is installed between the upper portion of the third chamber 130 and the upper surface of the striking force control valve 330. The spring 131 serves to press the upper surface of the striking force control valve 330 by the elastic force, and due to the spring 131, if a separate pressing force is not applied to the lower surface of the striking force control valve 330, the striking force control valve 330 is positioned below the third chamber 130.

The third chamber 130 (or the striking force control valve 330) is connected to the inlet 410 by the first flow passage 510 and the first flow passage 512, and the fourth flow passage 540 and the fourth flow passage 540. It is connected to the outlet 420 by the 4-1 flow path 541. In addition, the third chamber 130 (or the striking force control valve 330) is connected to the lower chamber 112 or the intermediate chamber 113 by each of the fifth connection channel 650 and the sixth connection channel 660. And a lower space of the second chamber 120 by each of the first connection channel 610 and the third connection channel 630.

Hereinafter, the fourth chamber 140 will be described.

The rock strength detection valve 350 is installed inside the fourth chamber 140, and the rock strength detection valve 350 is moved up and down inside the fourth chamber 140 by the hydraulic fluid, thereby, the fourth chamber 140 and the fourth chamber 140. Open and close connected flow paths.

In this case, the diameter of the upper space of the fourth chamber 140 is larger than the diameter of the lower space of the fourth chamber 140, the rock strength detection valve 350, the upper portion of the rock strength detection valve 350 The diameter is larger than the diameter of the lower portion of the rock strength detection valve 350.

The fourth chamber 140 (or the rock strength detection valve 350) is connected to the inlet 410 by the second flow passage 520 and the second flow passage 523, and to the fifth flow passage 550. It is connected to the outlet 420 by. In addition, the fourth chamber 140 (or the rock strength detection valve 350) may be formed by the upper chamber 114 and the second chamber 120 by the second connection channel 620 and the second-first connection channel 621. It is connected to the upper space of the, and is connected to the lower space of the second chamber 120 by the fourth connection flow path (640).

The accumulator 160 will be described below.

The accumulator 160 is connected to the inlet 410 by the first passage 510 and the first-first passage 511, and is filled with nitrogen gas inside the accumulator 160. Therefore, the accumulator 160 serves to prevent the high pressure hydraulic oil flowing into the cylinder 100 through the inlet 410 using the nitrogen gas.

Hereinafter, the piston 200 will be described.

The piston 200 is installed to be able to move up and down inside the first chamber 110 formed in the cylinder 100, the lower step 210 is formed at the lower portion of the piston 200, the upper portion of the piston 200 The upper step 220 is formed.

Therefore, when the high pressure hydraulic oil is supplied to the lower chamber 112, the high pressure hydraulic oil pushes the lower step 210 upward, thereby raising the piston 200, and the high pressure hydraulic oil is applied to the upper chamber 114. When supplied, the high pressure hydraulic oil pushes the upper step 220 downward, thereby lowering the piston 200.

As described above, when the hydraulic fluid is supplied to the upper chamber 114 so that the piston 200 descends, the piston 200 hits the rod 700 positioned below the piston 200, and thus the piston 200 When the rod 700 hit by) strikes the ground, it is possible to achieve fracture of the ground.

The lower step 210 and the upper step 220 of the piston 200 have the same diameter as the diameter of the first chamber 110.

In addition, the hydraulic area of the upper step 220 is formed larger than the hydraulic area of the lower step 210. In other words, the height of the upper step 220 is formed to be greater than the height of the lower step 210. As a result, when the hydraulic oil flows into the upper chamber 114 and the lower chamber 112, the hydraulic area by the hydraulic oil is The upper step 220 is larger than the lower step 210.

Therefore, when high-pressure hydraulic fluid flows into the upper chamber 114 and the lower chamber 112 at the same time, since the pressing force for pushing the upper step 220 downward acts more, the piston 200 can be easily lowered. .

Hereinafter, the piston control valve 310 will be described.

The piston control valve 310 is installed in the second chamber 120 formed in the cylinder 100 so as to be lifted and lowered, and an upper body 311 whose upper surface is pressurized by the hydraulic oil and the lower surface thereof by the hydraulic oil. Pressed, the protrusion 312 formed on the side of the upper body 311, the lower surface is pressed by the working oil, the lower body 313 and lower body formed on the lower portion of the upper body 311, the upper body 311 Piston control valve groove 314 formed in the side of the lower body, the first piston control valve flow path 316 formed in the lower body 313, the second piston control valve formed in the upper body 311 It is comprised including the flow path 317.

The upper body 311 is positioned in the upper space of the second chamber 120, and the protrusion 312 and the piston control valve groove 314 are formed at the side of the upper body 311. In addition, the upper surface of the upper body 311 is pressurized by the high-pressure hydraulic oil flowing through the second-second passage 522.

The protrusion 312 is formed to protrude in an annular shape on the side of the upper body 311 so as to be located below the piston control valve groove 314, so that the diameter of the protrusion 312 is larger than the diameter of the upper body 311 It is largely formed.

In addition, when the piston control valve 310 is positioned below the second chamber 120, a space is formed between the lower surface of the protrusion 312 and the lower portion of the upper space of the second chamber 120, thereby The lower surface of the protrusion 312 is pressurized by the high pressure hydraulic oil flowing through the second-first flow path 521.

The piston control valve groove 314 is formed in an annular shape on the side of the upper body 311 so as to be located above the protrusion 312, and serves to connect the 5-1 channel 551 and the fourth connecting channel 640. Do it.

The lower body 313 is formed to extend from the lower portion of the upper body 311 so that the piston control valve 310 is located in the lower space of the second chamber 120 when installed in the second chamber 120, the upper It has a diameter smaller than the diameter of the body 311.

The height of the lower body 313 is formed larger than the height of the lower space of the second chamber 120, whereby, when the piston control valve 310 does not rise, it is located below the second chamber 120, The lower surface of the lower body 313 touches the lower portion of the lower space of the second chamber 120, whereas the protrusion 312 does not touch the lower portion of the upper space of the second chamber 120. Therefore, in the above case, the separation space is formed between the protrusion 312 and the lower portion of the upper space of the second chamber 120.

In addition, the lower surface of the lower body 313 is pressurized by the high-pressure hydraulic oil flowing through the first connection flow path 610.

The first piston control valve flow path 316 is formed in the horizontal direction in the lower body 313, and when the piston control valve 310 descends, the third connection flow path 630 and the fourth connection flow path ( 640).

The second piston control valve flow path 317 is formed inside the upper body 311 and connects the first piston control valve flow path 316 and the fifth-first flow path 551. Therefore, as described above, the first piston control valve flow path 316 connects the third connection flow path 630 and the fourth connection flow path 640 so that the hydraulic fluid flows into the first piston control valve flow path 316. At this time, the hydraulic fluid flows to the fifth passage 551 to serve to discharge the low pressure line connected to the outlet 420.

Piston control valve 310 having the above configuration serves to control the high-pressure hydraulic fluid introduced into the cylinder 100 through the inlet 410 to enter the upper chamber 114, through which, the piston ( The lifting and lowering motion of the 200) is controlled.

In detail, when the piston control valve 310 is positioned below the second chamber 120 (state of FIG. 1), the connection between the second-first flow path 521 and the second connection flow path 620 is performed. As a result, the high-pressure hydraulic fluid introduced into the cylinder 100 through the inlet 410 is blocked from entering the upper chamber 114. Therefore, since the high pressure hydraulic fluid does not flow into the upper chamber 114, the piston 200 cannot be lowered.

On the other hand, when the piston control valve 310 is raised and positioned above the second chamber 120 (state of FIG. 2), the piston control valve groove 314 is the second-one flow path 521 and the second. By connecting the connection flow path 620, the connection between the second-first flow path 521 and the second connection flow path 620 is opened. Therefore, the high pressure hydraulic fluid introduced into the cylinder 100 through the inlet 410 is introduced into the upper chamber 114, whereby the piston 200 may descend.

The hydraulic area of the upper surface of the upper body 311 of the piston control valve 310 described above is larger than the hydraulic area of the lower surface of the protrusion 312, but the hydraulic area of the lower surface of the protrusion 312 and the lower surface of the lower body 313. Smaller than sum That is, the above-described piston control valve 310 is the hydraulic area of the lower surface of the protrusion 312 <the hydraulic area of the upper surface of the upper body 311 <the hydraulic area of the lower surface of the protrusion 312 and the hydraulic pressure of the lower body 313 Sum of the area 'condition is satisfied, and thus, unlike the conventional hydraulic striking device, when the piston control valve 310 is not operated, it may be kept at the bottom of the second chamber 120, and the piston control valve In operation, 310 may be easily lifted and positioned above the second chamber 120. In other words, the raising and lowering of the piston control valve 310 can be made smoothly without malfunction.

In detail, when the piston control valve 310 is located below the second chamber 120 (the state of FIG. 1), the high pressure hydraulic oil introduced into the cylinder 100 through the inlet 410 is removed. The lower surface of the protrusion 312 is introduced into the separation space formed between the lower portion of the upper space of the second chamber 120 and the lower surface of the protrusion 312 through the two passages 520 and the second-one passage 521. Simultaneously with the pressurization, the upper surface of the upper body 311 is pressed by flowing into the upper portion of the upper space of the second chamber 120 through the second channel 520 and the second channel-2-522.

In this case, since the hydraulic area of the upper body 311 is greater than the hydraulic area of the protrusion 312, the force of the high pressure hydraulic oil that presses the upper surface of the upper body 311 is increased by the high pressure that presses the lower surface of the protrusion 312. Greater than the power of hydraulic fluid. Accordingly, the piston control valve 310 is not operated and does not rise, and is positioned below the second chamber 120, that is, the state of closing the second-first flow path 521 and the fourth connection flow path 640. Can be maintained.

In addition, when the high pressure hydraulic fluid introduced into the cylinder 100 through the inlet 410 flows into the lower space of the second chamber 120 through the first connection flow path 610 (the state of FIG. 2), the high pressure The operating oil of the pressurizing the lower surface of the lower body (313). Of course, even in this case, the upper surface of the upper body 311 and the lower surface of the protrusion 312 are high-pressure hydraulic oil introduced by the 2-1 channel 521 and the 2-2 channel 522, as described above. It is pressurized by each.

As described above, when the high-pressure hydraulic oil presses the upper surface of the upper body 311, the lower surface of the protrusion 312, and the lower surface of the lower body 313, the hydraulic area of the upper surface of the upper body 311 is the protrusion 312. Is less than the sum of the hydraulic area of the lower surface of the lower body and the lower surface of the lower body 313, the force of the high-pressure hydraulic fluid to press the upper surface of the upper body 311 is lower and lower body 313 of the protrusion 312. ) Is smaller than the sum of the forces of the high pressure hydraulic oil pressurizing the lower surface. Accordingly, the piston control valve 310 is operated to rise and positioned above the second chamber 120, whereby the second-first flow passage 521 and the fourth connection flow passage 640 are opened and connected to each other.

As described above, the difference in the hydraulic area of the upper body 311, the lower body 313 and the protrusion 312 plays a big role in smoothly raising and lowering the piston control valve 310 together with the return flow path to be described later. Done. That is, the difference in the hydraulic areas of the upper body 311, the lower body 313 and the protrusion 312 is organically combined with the return flow path, thereby having an effect of smoothing the operation of the piston control valve 310.

Hereinafter, the striking force control valve 330 will be described.

The striking force control valve 330 is installed to be capable of lifting up and down inside the third chamber 130 formed in the cylinder 100, the striking force control valve groove 331 formed on the outside of the striking force control valve 330, and the striking force control It is configured to include a strike force control valve flow path 332 formed inside the valve 330.

In addition, the striking force control valve 330 may be configured as a rotatable rotary valve.

* Strike force control valve groove 331 is formed in an annular shape on the side of the striking force control valve 330, when the striking force control valve 330 is located below the third chamber 130, the fifth connection flow path (650) And the first connection passage 610. On the other hand, the striking force control valve groove 331 is not connected to not only the fifth connecting passage 650 but also the sixth connecting passage 660 when the striking force regulating valve 330 is positioned above the third chamber 130. Therefore, when the striking force control valve 330 is raised and positioned above the third chamber 130, the inflow of the high pressure hydraulic oil into the first connection flow path 610 is blocked (see FIGS. 8 to 10). state).

In addition, the striking force control valve groove 331 is connected to the striking force control valve flow path 332 when the hydraulic strike force control valve 330 rotates, thereby, the first-second flow path 512, the striking force control valve flow path ( 332, the hitting force control valve groove 331, and the fifth connection flow path 650 are connected (state of FIG. 12).

12, the striking force control valve flow path 332 is formed in a 'c' shape inside the striking force control valve 330, and as described above, when the striking force control valve 330 is rotated, the first -2 Euro 512 and the fifth connecting passage 650 is connected.

In other words, the striking force control valve flow path 332 immediately communicates the high pressure line and the low pressure line in accordance with the rotation of the striking force control valve 330, whereby the hydraulic striking device 10 can execute the anti-ballout mode. .

The spring 131 is installed between the upper surface of the striking force control valve 330 and the upper portion of the third chamber 130, and thus, if a separate pressing force is not applied to the lower surface of the striking force control valve 330, the striking force control valve 330 is maintained at the bottom of the third chamber (130).

The striking force control valve 330 as described above moves up and down inside the third chamber 130, and serves to control the operation time, that is, the elevation time of the piston control valve 310.

In detail, as shown in FIGS. 1 to 4, when a separate pressing force is not applied to the lower surface of the striking force control valve 330, as described above, the striking force control valve 330 is driven by the spring 131. It is maintained below the second chamber 120.

In this case, when the high pressure hydraulic fluid flows into the lower chamber 112 and the piston 200 rises, the high pressure hydraulic fluid is the fifth connection flow path 650, the impact force control valve groove 331, and the first connection flow path ( 610 flows in order to pressurize the lower surface of the lower body 313 of the piston control valve 310. Accordingly, the piston control valve 310 is operated to rise, and as a result, as described above, the high pressure hydraulic oil flows into the upper chamber 114.

On the other hand, as shown in Figure 7 to 9, when the high-pressure hydraulic fluid flowing through the third connection flow path 630 presses the lower surface of the force control valve 330, the force control valve 330 is operated As a result, the sixth connection flow path 660 and the hitting force control valve groove 331 are connected. Therefore, the flow of the high pressure hydraulic fluid flowing through the first connection flow path 610, that is, the high pressure hydraulic fluid that raises the piston control valve 310, is slowed down, and thus, the piston 200 is connected to the piston 200. The lower step 210 is raised until it is positioned above the fifth connection flow path 650 (state of FIG. 11).

The lift of the striking force control valve 330 and the piston 200 as described above is the stroke stroke of the hydraulic striking device 10, that is, the long-stroke and short-stroke stroke of the hydraulic striking device 10 and Related to this, the long stroke and the short stroke is the result of the striking force control valve 330 delays the operation of the piston control valve 310.

In other words, the striking force control valve 330 controls the operation timing of the piston control valve 310, thereby converting the striking stroke of the hydraulic striking device 10 into a long stroke and a single stroke, and thus, the hydraulic striking device ( 10) the impact force is controlled. Detailed description of the stroke stroke of the hydraulic striking device 10 will be described later.

In addition, as described above, the striking force control valve 330 may be configured as a rotary valve that is rotatable, which prevents vacancy of the hydraulic striking device 10 together with the aforementioned striking force control valve flow path 332. It is related to the mode. Detailed description of the anti-hit mode will be described later.

Hereinafter, the rock strength detection valve 350 will be described.

The rock strength detection valve 350 is installed to be capable of lifting up and down inside the fourth chamber 140 formed in the cylinder 100, and has an annular rock strength detection valve groove 351 formed on the side of the rock strength detection valve 350. It is configured to include).

The upper diameter of the rock strength detection valve 350 is formed larger than the diameter of the lower portion of the rock strength detection valve 350, the hydraulic area of the upper surface of the rock strength detection valve 350 is the lower surface of the rock strength detection valve 350 Is larger than the hydraulic area.

Therefore, as shown in FIG. 1, the high-pressure working oil pressurizes the upper surface of the rock strength detecting valve 350 through the 2-3 channel 523 and through the 2-1 connection flow path 621. When the lower surface of the rock strength detection valve 350 is pressurized, the rock strength detection valve 350 may be maintained at a lower portion of the fourth chamber 140 without being raised, and thus, the hydraulic striking device 10 Can be prevented from switching to the long stroke (or long mode).

The rock strength detection valve 350 as described above moves up and down inside the fourth chamber 140 to control the operation timing of the striking force control valve 330.

In detail, as shown in FIG. 2, when the high-pressure hydraulic oil simultaneously presses the upper and lower surfaces of the rock strength detection valve 350, the hydraulic areas of the upper and lower surfaces of the rock strength detection valve 350. Due to the difference, the rock strength detection valve 350 is maintained at the bottom of the fourth chamber 140.

In this case, the third passage 530 connected to the inlet 410 is closed so that it is not connected to the third connecting passage 630, the fourth connecting passage 640, and the first piston control valve passage 316. Therefore, as described above, the striking force control valve 330 is maintained without being raised in the lower portion of the third chamber (130).

On the other hand, as shown in Figure 6, when the rod 700 hits the hard rock of the ground, the operating oil in the interior of the upper chamber 114 by the repulsive force transmitted to the piston 200 hitting the rod 700 When the pressure increases rapidly, the hydraulic oil pressurizes the lower surface of the rock strength detecting valve 350 at a high pressure.

In this case, since the pressure of the hydraulic fluid is very high instantaneously, despite the difference in the hydraulic area between the upper and lower surfaces of the rock strength detecting valve 350, the rock strength detecting valve 350 is raised. Accordingly, the third passage 530 is connected to all of the third connecting passage 630, the fourth connecting passage 640, and the first piston control valve passage 316 by the rock strength detection valve groove 351. Therefore, the striking force control valve 330 can be easily raised.

As described above, the operation time of the striking force control valve 330 is controlled according to whether the rock strength detection valve 350 is raised or lowered, which is accompanied by the lifting and lowering movement of the striking force control valve 330. It is related to the stroke stroke. As described above, a detailed description of the hitting stroke, that is, the long stroke and the short stroke will be described later.

Hereinafter, the return flow path will be described.

The return flow path includes an intermediate chamber 113 formed between the piston 200 and the cylinder 100, a fifth connection flow path 650 connecting the intermediate chamber 113 and the striking force control valve 330, and the hydraulic oil to the outside of the cylinder. And a fourth passage 540 connecting the outlet 420 to the outlet and the intermediate chamber 113.

In addition, when the return flow path is located at the bottom dead center where the piston 200 descends and hits the rod 700, as shown in FIG. 4, the fifth connection flow path 650, the intermediate chamber 113, and the fourth flow path. The flow path 540 is made by the connection.

The return flow path as described above serves to return the piston control valve 310 to the pre-operation position by communicating the first connection flow path 610 that operated the piston control valve 310 with the low pressure line. Unlike the striking device, a smooth return of the piston control valve 310 can be achieved.

In detail, high pressure hydraulic fluid is flowed into the first connection channel 610 to press the lower surface of the lower body 313 of the piston control valve 310, and then hydraulic oil is introduced into the first connection channel 610. It remains. If the hydraulic fluid continues to remain in the first connection flow path 610 as described above, the piston control valve 310 is lowered to prevent the return to the lower portion of the second chamber 120.

In other words, as described above, the piston control valve 310 is the hydraulic area of the lower surface of the protrusion 312 <hydraulic area of the upper surface of the upper body 311 <hydraulic area of the lower surface of the protrusion 312 and the lower body ( Since the hydraulic area of the lower surface of the lower surface 313 'is satisfied, the pressure applied to the lower surface of the lower body 313 must be removed in order for the piston control valve 310 to be easily lowered. When the hydraulic oil is left in the above, since the pressure is not removed, the piston control valve 310 is difficult to descend.

Therefore, in order to remove the pressure, a return flow path is required, and as shown in FIG. 4, when the piston 200 is located at the bottom dead center, the return flow flow path is controlled by the hitting force control valve groove 332. The connection flow path 610 is connected.

In this case, since the fourth flow path 540 is connected to the low pressure line and the outlet 420, suction force is generated by the sump, and the hydraulic oil remaining in the first connection flow path 610 by the suction force is a blow force control valve. It is sucked into the low pressure line through the groove 332, the fifth connection flow path 650, the intermediate chamber 113, the fourth flow path 540 and the outlet 420, thereby, the lower portion of the lower body 313 The pressure applied is removed.

Accordingly, the piston control valve 310 is lowered by the high pressure hydraulic oil pressurizing the upper surface of the upper body 311 through the second-second flow passage 522, whereby the piston control valve 310 is lowered It is returned to be positioned below the second chamber 120.

As described above, the return flow path is organically coupled with the difference in the hydraulic areas of the upper body 311, the lower body 313 and the protrusion 312 of the piston control valve 310, thereby operating the piston control valve 310 You can make it smooth.

Hereinafter, the stroke stroke of the hydraulic striking device 10 according to the preferred embodiment of the present invention having the above-described configuration will be described.

Hydraulic striking device 10 according to a preferred embodiment of the present invention is automatically hit by the hydraulic fluid flowing through the valves and the flow path of the hydraulic striking device 10 according to the rock strength of the ground hitting / breaking the rod 700 Can switch administration. Therefore, unlike the conventional hydraulic striking device, it is not necessary for the user to grasp the state of the rock on the ground and change the striking stroke.

In detail, when the hydraulic striking device 10 strikes the ground which is mainly composed of soft rock having weak rock strength, the rock strength detecting valve 350 is not operated. Thus, FIG. 2 As shown in FIG. 1, the piston 200 is positioned until the top dead center of the relatively low piston 200 (in this case, the lower step 210 of the piston 200 is positioned above the fifth connection flow path 650). To perform a single stroke (or referred to as 'single mode').

On the other hand, in the case where the hydraulic striking device 10 strikes the ground, which is mainly made of strong rock, the rock strength detection valve 350 is operated, and thus, shown in FIG. As shown, the piston 200 is raised until the top dead center of the relatively high piston 200 (in this case, the lower step 210 of the piston 200 is located above the sixth connection flow path 660). Will perform a long stroke (or 'hit mode').

Hereinafter, the hydraulic stroke device 10 according to a preferred embodiment of the present invention will be described in detail with respect to the single stroke stroke is performed when hitting the ground constituting the soft rock.

The single stroke of the hydraulic striking device 10 according to the preferred embodiment of the present invention is made in the order of FIGS. 1, 2, 3, and 4.

First, when the rod 700 of the hydraulic striking device 10 is placed in contact with the ground to crush the soft rock of the ground, as shown in Figure 1, the rod 700 is raised to the upper surface of the rod 700 It is located at a position higher than the upper portion of the chamber 111, and is ready to be hit by the piston 200.

As shown in FIG. 1, when the high pressure hydraulic oil is supplied from the high pressure line to be introduced into the cylinder through the inlet 410, the high pressure hydraulic fluid flows to the first to third flow paths 530.

In this case, the 2-1 channel 521 and the 2-2 channel 522 by the piston control valve 310, the 1-2 channel 512 by the striking force control valve 330, the second The -3 flow path 523 and the 3rd flow path 530 are closed by the rock strength detection valve 350, respectively, and the high pressure hydraulic fluid cannot flow to the other chambers through the flow paths.

On the other hand, since the connection of the first passage 510 and the lower chamber 112 is open, the high-pressure hydraulic fluid flows into the lower chamber 112 through the first passage 510, and thus, the lower chamber ( 112, the high pressure hydraulic oil flows in.

As shown in FIG. 2, when a high pressure hydraulic oil flows into the lower chamber 112, the piston 200 rises upward, and thus, the connection between the lower chamber 112 and the fifth connection flow path 650 is performed. Becomes open. Accordingly, the high pressure hydraulic fluid flows in the order of the fifth connection flow path 650, the striking force control valve groove 331, and the first connection flow path 610, and then the lower body 313 of the piston control valve 310. The lower surface will be pressurized.

As described above, as the lower surface of the lower body 313 is pressurized by the high pressure hydraulic fluid, the piston control valve 310 is raised, the high pressure hydraulic oil supplied from the high pressure line is the inlet 410, the second flow path 520 And into the upper space of the second chamber 120 through the second-first flow path 521.

Therefore, it flows through the high pressure hydraulic fluid second connection flow path 620 introduced into the upper space of the second chamber 120 and flows into the upper chamber 114. In this case, as described above, the high-pressure hydraulic fluid also flows into the 2-1 flow path 521 connected to the high pressure line, but the hydraulic area of the lower portion of the rock strength detection valve 350 is upper than the rock strength detection valve 350. Since it is smaller than the hydraulic area of the rock strength detection valve 350 does not rise.

As above, when the high-pressure hydraulic oil flows into the upper chamber 114, as shown in Figure 3, the piston 200 is lowered.

As shown in FIG. 4, when the piston 200 is completely lowered and positioned at the bottom dead center, the lower surface of the piston 200 hits the upper surface of the rod 700, and the hit rod 700 descends to the ground. By striking the soft rock of, fracture of soft rock is achieved.

When the rod 700 crushes soft rock, the repulsive force is transmitted to the piston 200. In this case, since the soft rock has a weak strength, the repulsive force transmitted to the piston 200 is relatively inferior, whereby the hydraulic oil pressure inside the upper chamber 114 rises inadequately.

Therefore, the pressure of the working oil inside the second connection passage 620 and the second connection passage 621 connected to the upper chamber 114 is insufficient to raise the rock strength detection valve 350, and thus The rock strength detection valve 350 does not rise and continues to be positioned below the fourth chamber 140.

In addition, when the piston 200 is completely lowered and positioned at the bottom dead center, the return flow path described above is connected to the striking force control valve groove 331 and the first connection flow path 610, and thus, the first connection flow path 610. The hydraulic oil remaining in the) is sucked into the low pressure line and recovered. Accordingly, the piston control valve 310 is lowered and returned to the lower portion of the second chamber 120 as shown in FIG. 1.

As described above, when the piston 200 is located at the bottom dead center to hit the rod 700, the piston 200 is returned to the position of FIG. 1 again, by repeating the above-described procedure, the single stroke of the piston 200 The stroke can be repeated. That is, the hydraulic striking device 10 according to the preferred embodiment of the present invention repeats the state of FIGS. 1 to 4 to execute the short stroke mode of the hydraulic striking device 10.

Hereinafter, the hydraulic stroke device 10 according to a preferred embodiment of the present invention will be described in detail with respect to the stroke stroke is performed when hitting the ground of the main rock.

The long stroke of the hydraulic striking device 10 according to the preferred embodiment of the present invention is in the order of FIGS. 1, 2, 3, 5, 6, 7, 8, 9, 10, and 11. Is done.

The long stroke of the hydraulic striking device 10 starts at the short stroke (state of Figs. 1 to 3) and is performed after striking the steel rock (state of Figs. 5 to 11). Therefore, the up and down strokes of the piston 200 illustrated in FIGS. 1 to 3 are the same as the above-described single stroke stroke, and a description thereof will be omitted.

After the hydraulic striking device 10 passes through the state of FIG. 3 described in the above-mentioned single stroke, as shown in FIG. 5, when the piston 200 is completely lowered and positioned at the bottom dead center, the lower surface of the piston 200 is The upper surface of the rod 700 is hit, and the hit rod 700 descends and strikes the rock in the ground, thereby breaking up the rock.

When the rod 700 crushes the hard rock, the repulsive force is transmitted to the piston 200. In this case, since the hard rock has a strong strength, the repulsive force transmitted to the piston 200 is very large, whereby the pressure of the hydraulic oil inside the upper chamber 114 rises instantaneously to a high pressure.

Therefore, the pressure of the working oil inside the second connection passage 620 and the second connection passage 621 connected to the upper chamber 114 is sufficient to raise the rock strength detection valve 350, and thus As shown in FIG. 6, the hydraulic fluid flowing into the second-first connection passage 621 presses the lower surface of the rock strength detection valve 350, thereby raising the rock strength detection valve 350 to increase the fourth chamber ( 140 is located on the top.

In addition, when the piston 200 is completely lowered and positioned at the bottom dead center, the return flow path described above is connected to the striking force control valve groove 331 and the first connection flow path 610, and thus, the first connection flow path 610. The hydraulic oil remaining in the) is sucked into the low pressure line and recovered. Accordingly, the piston control valve 310 is lowered and returned to the lower portion of the second chamber 120. In FIG. 6, the piston control valve 310 is lowered, that is, is being returned.

As shown in FIG. 6, as the rock strength detection valve 350 is raised, the third flow path 530 and the fourth connection flow path 640 are connected by the rock strength detection valve groove 351. Thus, the high pressure hydraulic fluid flows to the fourth connection flow path 640 through the inlet 410, the third flow path 530, and the rock strength detection valve groove 351.

After the instantaneous pressure rise of the working oil in the upper chamber 114 is finished, the rock strength detection valve 350 is lowered as shown in FIG. 7 to be positioned below the fourth chamber 140.

In addition, as illustrated in FIG. 7, the descending piston control valve 310 has a predetermined position, that is, the first piston control valve flow path 316 has a third connection flow path 630 and a fourth connection flow path 640. When placed in the position connecting the hydraulic fluid flows to the fourth connection flow path 640 flows through the third connection flow path 630 to press the lower surface of the force control valve 330.

As such, the lowering force of the striking force control valve 330 is raised to the upper portion of the third chamber 130, as shown in FIG.

In this case, the descending piston control valve 310 is finished falling, thereby returning to the lower portion of the second chamber 120. In addition, as the piston control valve 310 descends, the first piston control valve flow passage 316 no longer connects the third and fourth

connection flow passages

630 and 640, and the first piston control valve flow passage 316 is no longer connected to the first piston control valve flow passage 316. The remaining hydraulic oil is recovered to the low pressure line through the second piston control valve flow path 317, the 5-1st flow path 551, the fifth flow path 550, and the outlet 420.

As described above, in the state in which the striking force control valve 330 is raised, the high pressure hydraulic fluid is introduced into the lower chamber 112 through the inlet 410 and the first flow passage 510 connected to the high pressure line, thereby, FIG. As shown in FIG. 9, the piston 200 is raised.

In this case, since the striking force control valve 330 is raised, the high-pressure hydraulic fluid of the lower chamber 112 in which the fifth connection flow path 650 and the piston 200 are raised is blocked by the striking force control valve 330 to adjust the striking force. It may not flow into the valve groove 331 and the first connection flow path 610. That is, due to the rising of the striking force control valve 330, the connection from the fifth connection passage to the first connection passage 610 is closed.

Accordingly, as shown in FIG. 10, the piston 200 is raised until the lower step 210 is positioned to the upper portion of the sixth connection channel 660. In this case, the top dead center of the piston 200 reaches a position higher than the above-described single stroke, that is, the top dead center of the piston 200 of FIG. 2, whereby the piston 200 rising in the long stroke is achieved. do.

As described above, after the piston 200 is raised, the pressure of the hydraulic oil pressurizing the lower surface of the striking force control valve 330, that is, the hydraulic oil inside the third connection flow path 630 is lowered, and, as a result, in FIG. As shown, the striking force control valve 330 is lowered by the elastic force of the spring 131, it is returned to the lower portion of the fourth chamber 140.

Therefore, the fifth connection flow path 650 and the first connection flow path 610 are connected to each other by the impact force control valve groove 331 of the returned stroke force control valve 330, thereby flowing into the lower chamber 112. The high pressure hydraulic oil is pressurized on the lower surface of the lower body 313 of the piston control valve 310.

As the lower surface of the lower body 313 is pressurized, the piston control valve 310 is raised, whereby high-pressure hydraulic fluid flows into the inlet 410, the second flow path 520, and the second flow path 521. The second lower chamber 112 flows in the order of the second connection flow path 620 and flows into the upper chamber 114.

As such, when the high pressure hydraulic fluid flows into the upper chamber 114, the piston 200 descends to strike the rod 700.

As described above, when the piston 200 descends to the bottom dead center and the lower surface of the piston 200 hits the upper surface of the rod 700, the piston 200 is subjected to the repulsive force again, and by repeating the above-described procedure, the piston The long stroke of 200 may be repeated.

That is, the hydraulic striking device 10 according to the preferred embodiment of the present invention performs the states of FIGS. 1 to 3 and 5 to 11 in order, and then repeats the states of FIGS. 5 to 11 in order. The long hit mode of the hydraulic striking device 10 is executed.

In addition, the stroke stroke of the hydraulic striking device 10 according to the preferred embodiment of the present invention can be automatically switched to the stroke stroke according to the state of the rock constituting the base of the ground striking the rod 700.

For example, when the rock to be fractured is changed from hard rock to soft rock as the rock fracture progresses, when the piston 200 hits the rod 700, the repulsive force does not occur significantly, and thus, the rock strength detection valve 350 does not work.

Therefore, as described above, the piston 200 is raised only to the extent that the lower step 210 of the piston 200 is located above the fifth connection flow path 650, thereby, the hydraulic striking device 10 Can perform a single stroke.

In addition, when the rock to be fractured is changed from soft rock to hard rock as the rock fracture proceeds, when the piston 200 hits the rod 700, a large repulsion force occurs, and thus, the rock strength detection valve ( 350 is operated to ascend above the fourth chamber 140. Therefore, as described above, the piston 200 is raised until the lower step 210 of the piston 200 is located above the sixth connection flow path 660, thereby, the hydraulic striking device 10 Can perform a long stroke.

In addition, the long stroke of the hydraulic striking device 10 according to the preferred embodiment of the present invention may have a top dead center lower than the top dead center of the piston 200 of FIG.

For example, when the repulsive force transmitted to the piston 200 is sufficient to operate the rock strength detecting valve 350, but is enough to raise the rock strength detecting valve 350 to an intermediate point of the fourth chamber 140. The amount of the working oil flowing through the three connection flow path 630 will flow relatively less than the above case. Therefore, the impact force control valve 330 is raised only for a short time by the relatively small amount of hydraulic fluid.

Therefore, when the high pressure hydraulic fluid flows into the lower chamber 112 through the inlet 410 and the first flow path 510 connected to the high pressure line, the piston 200 rises. Strike force control valve 300 is lowered before going up to the height of the top dead center.

As described above, as the striking force control valve 300 descends, the hydraulic fluid introduced into the lower chamber 112 passes through the fifth connecting passage 650, the striking force control valve groove 331, and the first connecting passage 610. The lower body 313 of the control valve 310 is pressurized, which causes the inlet 410, the second flow path 520, the 2-1 flow path 521, the second lower chamber 112, and the second. Flow in the connection flow path 620 flows into the upper chamber 114. Therefore, the piston 200 descends by the high pressure hydraulic oil introduced into the upper chamber 114 to strike the rod 700.

As described above, the top dead center of the piston 200 is higher than the height of the top dead center of the piston 200 in the state of FIG. 2 according to the time when the striking force control valve 300 rises, but the piston in the state of FIG. 10. It is located lower than the height of the top dead center of (200).

That is, when the repulsive force transmitted to the piston 200 according to the rock state has only a force enough to raise the rock strength detecting valve 350, the top dead center of the piston 200 of the above-mentioned single stroke according to the magnitude of the repulsive force The top dead center of the piston 200 can be located within the range of (the state of FIG. 2) and the top dead center (state of FIG. 10) of the piston 200 of the above-mentioned long stroke. Thus, the position of the top dead center of the piston 200 can be located within the range of the state of FIG. 2 and the state of FIG. 10, whereby the stroke stroke of the hydraulic striking device 10 has a continuous behavior according to the rock state, That is, stepless behavior may be achieved rather than stepwise behavior.

* When the hydraulic striking device 10 according to a preferred embodiment of the present invention through the stepless behavior described above, when the ground is crushed, even if the state of the crushed rock continues to change accordingly the top dead center of the piston 200 accordingly The location may change. Therefore, the striking stroke can be converted and responded immediately, thereby increasing the breaking efficiency of the hydraulic striking device 10.

The hydraulic striking device 10 according to the preferred embodiment of the present invention may perform an anti-batting mode for preventing the hitting of the piston as well as the above-described stroke force stroke.

Hereinafter, the vacancy of the hydraulic striking device 10 will be described.

When the rod 700 of the hydraulic striking device 10 touches the ground, as shown in FIG. 1, the upper surface of the rod 700 is maintained in an elevated state so as to be positioned higher than the lower portion of the load chamber 111. Therefore, when the piston 200 is lowered and positioned at the bottom dead center, the piston 200 hits the upper surface of the rod 700, and the rod 700 is transmitted by the impact force transmitted from the piston 200 to the rod 700. As the) descends, the rock or the like of the ground can be broken.

On the other hand, when the rod 700 is spaced apart from the ground and does not touch the ground or touches a soft ground such as mud, as shown in FIG. 12, the rod 700 descends and the top surface of the rod 700 is lowered. It is located lower than the lower portion of the load chamber 111. Therefore, even if the piston 200 is lowered, it is impossible to hit the upper surface of the rod 700.

As described above, the piston 200 is not hitting the rod 700 is called hitting, when the hit is executed, as described above, the piston 200 hits the lower portion of the load chamber 111 piston 200 And breakage of the load chamber 111 occurs.

Therefore, the hydraulic striking device 10 according to the preferred embodiment of the present invention rotates the striking force control valve 330 composed of a rotary valve to prevent damage to the piston 200 and the load chamber 111 due to such a strike. By doing so, it is possible to perform the anti-ballout mode to prevent the ball of the piston 200.

Hereinafter, the anti-ballout mode of the hydraulic striking device 10 according to a preferred embodiment of the present invention will be described in detail.

The anti-ballout mode of the hydraulic striking device 10 according to the preferred embodiment of the present invention is executed by rotating the striking force control valve 330 before the rod 700 of the hydraulic striking device 10 touches the ground.

As above, before the rod 700 of the hydraulic striking device 10 touches the ground, that is, when the hydraulic striking device 10 is positioned on the ground, the rod 700 of the hydraulic striking device 10 is subjected to gravity. 12, the upper surface of the rod 700 is positioned at a lower position than the lower portion of the load chamber 111, as shown in FIG. 12. In addition, the lower surface of the piston 200 is brought into contact with the lower portion of the load chamber 111 by gravity.

As such, when the striking force control valve 330 is rotated in a state in which the rod 700 and the piston 200 are lowered, as shown in FIG. 12, the striking force control valve flow path 332 is the first-second flow path 512. And the fifth connection passage 650 are connected.

In addition, the striking force control valve flow path 332 is connected to the return flow path by the striking force control valve groove 331.

Therefore, when the high pressure hydraulic oil is supplied to the inlet 410 by the pump of the high pressure line, the high pressure hydraulic oil is provided in the first flow passage 510, the 1-2 flow passage 512, the blow force control valve flow path 332, and the blow force control. After flowing in the valve groove 331 order, it flows to a return flow path.

As described above, since the return flow path is connected to the low pressure line, the hydraulic oil is supplied to the fifth connection flow path 650, the intermediate chamber 113, the fourth flow path 540, and the outlet 420 by the suction force of the sump of the low pressure line. Flows to the low pressure line and is recovered.

As described above, when the anti-ballast mode of the hydraulic striking device 10 is executed, the hydraulic oil supplied to the high pressure line is directly recovered to the low pressure line via the striking force control valve flow path 332 and the intermediate chamber 113, and thus, Lifting operation of the piston 200 is not made. Therefore, the pitting of the hydraulic striking device 10 does not occur, whereby it is possible to prevent the piston 200 from being damaged.

In the anti-battery mode according to the preferred embodiment of the present invention described above, the rod 700 is raised to raise the piston 200 to the position of FIG. 1 (the lower chamber 112 is connected to the first passage 510). When it is pushed in, the single stroke and the long stroke of the hydraulic striking device 10 can be executed.

In other words, the rod 700 in the state in which the striking force control valve 330 is rotated so that the striking force control valve groove 331 executes the anti-ballout mode in which the first-second flow path 512 and the fifth connection flow path 650 are connected. ) Touches the ground, the high-pressure hydraulic oil can be introduced into the lower chamber 112 through the first flow path 510, the above-described stroke stroke and the stroke stroke can be achieved.

As described above, the hydraulic striking device 10 according to a preferred embodiment of the present invention, unlike the conventional hydraulic striking device when performing a single stroke or a long stroke, can be used in parallel with the anti-ballet mode, and thus, soft ground In the case of crushing or when the piston 200 is operated while the rod 700 is spaced apart from the ground, striking is prevented and damage to the piston 200 and the rod chamber 111 can be prevented.

As described above, although described with reference to a preferred embodiment of the present invention, those skilled in the art various modifications of the present invention without departing from the spirit and scope of the invention described in the claims below. Or it may be modified.

(Explanation of the sign)

10: hydraulic strike device 100: cylinder

110: first chamber 111: load chamber

112: lower chamber 113: intermediate chamber

114: upper chamber 115: buffer chamber

120: second chamber 130: third chamber

131: spring 140: fourth chamber

160: accumulator 200: piston

210: lower step 220: upper step

310: piston control valve 311: upper body

312: protrusion 313: lower body

314: piston control valve groove 316: first piston control valve flow path

317: second piston control valve flow path 330: striking force control valve

331: Strike force control valve groove 332: Strike force control valve flow path

350: rock strength detection valve 351: rock strength detection valve groove

410: inlet 420: outlet

510: Euro 1 511: Euro 1-1

512: 1-2 euro 520: 2nd euro

521: Euro 2-1 522: Euro 2-2

523 euro 2-3, 530 euro third

540: Euro 4 541: Euro 4-1

550: Euro 5 551: Euro 5-1

610: first connection flow path 620: second connection flow path

621: 2-1st connection flow path 630: 3rd connection flow path

640: fourth connection channel 650: fifth connection channel

660: sixth connection euro 700: rod

Claims

cylinder;

A piston installed in the cylinder to move up and down;

An upper chamber provided above and a lower chamber provided below between the piston and the cylinder;

A piston control valve for controlling the lifting operation of the piston;

A striking force regulating valve controlling an operation time of the piston control valve;

A rock strength sensing valve controlling an operation time of the striking force control valve; And

And a return flow path for communicating the connection flow path for operating the piston control valve with the low pressure line and returning the piston control valve to the pre-operation position.
The method of claim 1,

Further comprising: a first connecting passage for connecting the piston control valve and the striking force control valve,

The return flow path,

An intermediate chamber formed between the piston and the cylinder;

A fifth connection passage connecting the intermediate chamber and the striking force control valve; And

And a fourth flow path connecting the outlet port and the intermediate chamber to allow the hydraulic oil to flow out of the cylinder.

The operating oil of the first connection passage at the bottom dead center of the piston is a hydraulic striking device, characterized in that in communication with the low pressure line through the impact force control valve and the return flow path.
The method of claim 1,

The piston control valve,

An upper body whose upper surface is pressed by the working oil;

The lower surface is pressed by the working oil, the protrusion formed on the side of the upper body; And

Its lower surface is pressurized by the operating oil, and the lower body formed on the lower portion of the upper body;

Hydraulic area of the upper surface of the upper body is greater than the hydraulic area of the lower surface of the protrusion, the hydraulic striking device, characterized in that less than the sum of the hydraulic area of the lower surface of the protrusion and the lower body.
The method of claim 1,

The striking force control valve is composed of a rotary valve, the striking force control valve flow path formed inside the striking force control valve;

The striking force control valve flow path is a hydraulic striking device, characterized in that for communicating the high pressure line and the low pressure line in accordance with the rotation of the force control valve.