Hydraulic breaking hammer reversing valve

Abstract

The utility model relates to a kind of hydraulic breaking hammer reversing valve, including valve body, valve sleeve and valve core, the valve core can be moved up and down in valve sleeve, the cavity wall of valve body has high-low pressure cavity, oil return cavity one, signal cavity, oil return cavity two and high pressure cavity;Valve core is equipped with core inner hole in;The valve core includes core main body, first ring platform and second ring platform, annular groove is equipped on the core main body, the outer diameter of first ring platform is greater than the outer diameter of second ring platform, the outer diameter of second ring platform is greater than the outer diameter of the core main body.The utility model valve core moves up and down in valve sleeve, without replacing valve body;Valve core is not processed various oil holes on, and the overall strength of valve core is high, and valve core is not easy to deform under high pressure and high temperature;When high pressure is connected with high-low pressure cavity through reversing valve, only pass through an oil hole, reduce the pressure loss in the process of high pressure oil, improve the flow capacity of high pressure oil, and then improve the hydraulic efficiency of hydraulic breaking hammer.

Description

Technical Field

[0001] This utility model relates to a hydraulic breaker reversing valve, belonging to the field of breaker technology. Background Technology

[0002] A hydraulic breaker is an impact tool that converts hydraulic energy into striking energy. By combining it with excavators, loaders, and other hydraulic power units, it uses the hydraulic energy of these devices to enable the piston to reciprocate and strike the chisel inside the breaker, thereby effectively breaking the workpiece. Hydraulic breakers are widely used in many fields such as mining, municipal engineering, building construction, highway and railway construction.

[0003] Existing hydraulic breaker directional valves include a valve seat, a valve cover, a valve core housed within the valve seat, and a valve sleeve. The valve core is located between the valve seat and the valve sleeve. The valve core has a thin-walled core hole, the valve sleeve has a thin-walled sleeve hole, and the valve cover has a thin-walled cover hole. When high-pressure oil connects to the high-low pressure switching chamber through the directional valve, it needs to pass through the thin-walled core hole on the valve core, the thin-walled sleeve hole on the valve sleeve, and the thin-walled cover hole on the valve cover. The high-pressure oil experiences significant pressure loss after passing through these three thin-walled holes, affecting its flow capacity and thus the hydraulic efficiency of the hydraulic breaker. Furthermore, various oil passage holes need to be machined on the valve core, affecting its strength and making it prone to deformation under high pressure and high temperature. Utility Model Content

[0004] This utility model addresses the shortcomings of existing technologies by providing a hydraulic breaker directional valve.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A hydraulic breaker reversing valve includes a valve body, a valve sleeve disposed in the valve body, and a valve core disposed in the valve sleeve. The valve core can move up and down in the valve sleeve. The cavity wall of the valve body is provided with a high and low pressure cavity, a first return oil cavity, a signal cavity, a second return oil cavity, and a high pressure cavity in sequence from top to bottom. The valve sleeve is provided with a high and low pressure connecting oil hole communicating with the high and low pressure cavity, a first return oil connecting oil hole communicating with the first return oil cavity, a second return oil connecting oil hole communicating with the second return oil cavity, and a signal connecting oil hole communicating with the signal cavity. The valve core has an inner hole, and the high-pressure chamber is located on the bottom cavity wall of the valve body. The valve core includes a core body, a first annular platform disposed on the core body, and a second annular platform located below the first annular platform. The core body has an annular groove. The outer diameter of the first annular platform is larger than the outer diameter of the second annular platform, and the outer diameter of the second annular platform is larger than the outer diameter of the core body.

[0006] The beneficial effects of this utility model are as follows: the valve core moves up and down within the valve sleeve, so even if there are scratches between the valve core and the valve sleeve, only the valve sleeve needs to be replaced, without replacing the valve body, thus reducing the maintenance cost of the directional valve; the valve core does not have various oil passage holes machined on it, which enhances its strength. The overall strength of the valve core is high, and it is not easily deformed under high pressure and high temperature, extending the service life of the directional valve and ensuring the stability and reliability of the hydraulic breaker's directional valve; when high pressure is connected to the high and low pressure chambers through the directional valve, it only passes through one oil passage hole on the valve sleeve, which reduces the pressure loss of high pressure oil during the process compared to the original requirement of passing through three thin-walled holes, improves the flow capacity of high pressure oil, and thus improves the hydraulic efficiency of the hydraulic breaker.

[0007] Based on the above technical solution, the present invention can be further improved as follows.

[0008] Furthermore, the valve sleeve adopts a split structure.

[0009] The advantages of adopting the above-mentioned further solution are that, by using a split-structure valve sleeve, it is convenient to install the valve core inside the valve sleeve, and if a component of the valve sleeve is damaged, the damaged component can be replaced separately without replacing the entire valve sleeve, thus reducing maintenance costs.

[0010] Furthermore, the valve sleeve includes a first valve sleeve and a second valve sleeve, the first valve sleeve is located above the second valve sleeve, the inner diameter of the upper part of the second valve sleeve is adapted to the outer diameter of the first annular platform, and the inner diameter of the lower part of the second valve sleeve is adapted to the outer diameter of the second annular platform.

[0011] The beneficial effect of adopting the above-mentioned further solution is that the installation of the valve core and valve sleeve is more convenient. The upper part of the valve core is inserted into the first valve sleeve, and the lower part of the valve core is inserted into the second valve sleeve, which ensures that the valve core moves up and down in the valve sleeve without scratching or wearing the valve body. The first valve sleeve and the second valve sleeve are processed and assembled independently. When a valve sleeve is worn or malfunctions, only the corresponding first valve sleeve or second valve sleeve needs to be replaced, which effectively reduces the maintenance cost of the directional valve.

[0012] Furthermore, the high and low pressure connecting oil hole, the return oil connecting oil hole one, and the signal connecting oil hole are respectively provided on the first valve sleeve, and the return oil connecting oil hole two is provided on the second valve sleeve; Alternatively, the high and low pressure connecting oil hole and the return oil connecting oil hole one are provided on the first valve sleeve, the first valve sleeve and the second valve sleeve are connected to form the signal connecting oil hole, and the return oil connecting oil hole two are provided on the second valve sleeve.

[0013] The beneficial effect of adopting the above-mentioned further scheme is that this layout makes the internal oil circuit structure of the directional valve more reasonable, the layout between each oil hole more compact, reduces the oil circuit length and bends, thereby reducing the pressure loss of hydraulic oil during the flow process and improving the working efficiency of the hydraulic system.

[0014] Furthermore, the high and low pressure chambers, the first oil return chamber, the signal chamber, and the second oil return chamber are respectively located on the outer peripheral wall of the valve body.

[0015] The beneficial effects of adopting the above-mentioned further scheme are that the various chambers are reasonably distributed on the valve seat, which not only facilitates the flow and control of hydraulic oil, but also effectively reduces the mutual interference between the chambers, enhances the strength and stability of the valve seat, improves the reliability and durability of the directional valve during operation, and ensures that the hydraulic breaker can operate stably for a long time.

[0016] Furthermore, the valve body includes a valve seat and a valve cover disposed on the valve seat, the valve cover mounting the valve sleeve inside the valve seat.

[0017] The advantages of adopting the above-mentioned further solution are that this structural form ensures the stable installation of the valve sleeve within the valve seat, effectively preventing loosening or displacement of the valve sleeve due to hydraulic shock during operation. Simultaneously, the valve cover provides additional protection for the valve sleeve, preventing external impurities or particles from entering the valve sleeve's interior, thereby ensuring the cleanliness and operational performance of the directional valve. Furthermore, this structure facilitates the disassembly and replacement of the valve sleeve, providing convenience for subsequent maintenance and repair work. Furthermore, the valve core is also provided with at least one oil replenishment hole.

[0018] The beneficial effect of adopting the above-mentioned further solution is that the oil replenishment hole is located on the core body of the valve core. In one scenario, when the piston of the breaker impacts downwards, the piston's large diameter will cut off the connection between the hammer signal chamber and the hammer high-pressure chamber, making the signal chamber a closed chamber. If there is leakage in the signal chamber, for example, due to a clearance fit between the valve core and the valve sleeve, or slight scratches on the valve core and valve sleeve, the pressure in the signal chamber will leak to the upper and lower return oil chambers, causing a decrease in signal chamber pressure, which may lead to premature valve closure. Adding a very small oil replenishment hole, which connects to the high-pressure chamber through the inner hole of the valve core, can promptly replenish the internal leakage of signal chamber pressure and stabilize the signal chamber pressure. In another scenario, when the piston reaches the valve switching point, the signal chamber will suddenly connect with the return oil. This oil replenishment hole remains connected to the high-pressure chamber, preventing the signal chamber pressure from suddenly dropping to the same low level as the return oil chamber, thus reducing hydraulic shock.

[0019] Furthermore, the core body located between the annular groove and the first annular platform is provided with a main body circumferential pressure equalization groove.

[0020] The beneficial effect of adopting the above-mentioned further solution is that the circumferential pressure equalizing groove of the main body can balance the hydraulic pressure on the outer circumference of the main body, reduce the lateral force caused by uneven pressure that leads to valve core displacement, and effectively reduce the wear between the valve core and the valve sleeve. This not only extends the service life of the directional valve, but also ensures the stability and reliability of the directional valve during long-term operation.

[0021] Furthermore, a first circumferential pressure equalization groove is provided on the outer circumferential surface of the first ring platform.

[0022] The beneficial effect of adopting the above-mentioned further solution is that the first circumferential pressure equalizing groove can balance the hydraulic pressure on the outer circumferential surface of the first ring platform, so that the pressure on the outer circumferential surface of the first ring platform can achieve the effect of pressure equalization. The hydraulic pressure on the outer circumferential surface of the first ring platform can be more evenly distributed, reducing the problem of valve core displacement caused by lateral force due to uneven circumferential pressure, reducing wear between valve core and valve sleeve, and further extending the service life of the directional valve.

[0023] Furthermore, a second circumferential pressure equalization groove is provided on the outer circumferential surface of the second ring platform.

[0024] The beneficial effect of adopting the above-mentioned further solution is that the second circumferential pressure equalizing groove can balance the hydraulic pressure on the outer circumferential surface of the second ring platform, reduce the lateral force caused by the uneven circumferential pressure, reduce the wear between the valve core and the valve sleeve, and extend the service life of the directional valve core and valve sleeve.

[0025] Furthermore, the first ring platform is provided with at least one oil drain groove.

[0026] The beneficial effects of adopting the above-mentioned further solution are that, on the one hand, the drain groove can reduce hydraulic shock. When the signal chamber is connected to high pressure, the pressure can be slightly released through the drain groove to reduce hydraulic shock. On the other hand, it can release the pressure leaking into the signal chamber through the piston and cylinder, preventing the valve from opening prematurely. As the piston rises, the distance between the high-pressure chamber of the sealing hammer and the hammer signal chamber becomes shorter and shorter, and the pressure leaking into the hammer signal chamber will become higher and higher. The valve gap and diameter are smaller than the piston, so the pressure leaking through the valve will be smaller, and the pressure in the signal chamber will become higher and higher. Without the drain groove, the directional valve may have already opened before the piston has connected to the hammer signal chamber. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the reversing valve of this utility model in the closed state; Figure 3 This is a schematic diagram of the reversing valve of this utility model in the open state; Figure 4 This is a schematic diagram of the valve core structure of this utility model; Figure 5 for Figure 4 A schematic diagram of the cross-sectional structure along the AA direction; Figure 6 This is a schematic diagram of the valve core structure of this utility model from the left side. Figure 7 A schematic diagram showing the piston contacting the chisel of a hydraulic breaker. Figure 8 for Figure 7 A magnified view of a section at point B in the middle; Figure 9 A schematic diagram of the piston return state of the hydraulic breaker; Figure 10 for Figure 9 A magnified view of a section at point C; Figure 11 This is a schematic diagram of the piston structure of a hydraulic breaker; In the diagram, 100 is the valve body; 101 is the valve cover; 102 is the valve seat; 103 is the high and low pressure chamber; 104 is the first return oil chamber; 105 is the signal chamber; 106 is the second return oil chamber; 107 is the high pressure chamber; 200 is the valve sleeve; 201 is the first valve sleeve; 202 is the second valve sleeve; 203 is the high and low pressure connecting oil hole; 204 is the first return oil connecting oil hole; 205 is the signal connecting oil hole; 206 is the second return oil connecting oil hole; 300 is the valve core; 301 is the core body; 302 is the annular groove; 303 is the first annular platform; 30 4. Second ring platform; 305. Core inner hole; 306. Oil drain groove; 307. Oil replenishment hole; 308. Main body circumferential pressure equalization groove; 309. First circumferential pressure equalization groove; 310. Second circumferential pressure equalization groove; 400. Seal; 501. Piston; 502. Drill rod; 503. Front shell; 504. Rear shell; 505. Cylinder block; 506. Hammer high and low pressure conversion chamber; 507. Hammer return oil chamber; 508. Hammer signal chamber; 509. Hammer high pressure chamber; 510. Nitrogen chamber; 511. Pressure relief ring groove; 512. Vertical pressure relief groove. Detailed Implementation

[0028] The principles and features of this utility model are described below with reference to examples. The examples are only used to explain this utility model and are not intended to limit the scope of this utility model.

[0029] like Figures 1-6As shown, a hydraulic breaker directional valve includes a valve body 100, a valve sleeve 200 disposed within the valve body 100, and a valve core 300 disposed within the valve sleeve 200. The valve core 300 is capable of moving up and down within the valve sleeve 200. The cavity wall of the valve body 100 is provided with, from top to bottom, a high and low pressure cavity 103, a first return oil cavity 104, a signal cavity 105, a second return oil cavity 106, and a high pressure cavity 107. The valve sleeve 200 is provided with a high and low pressure connecting oil hole 203 connecting the high and low pressure cavity 103, a first return oil connecting oil hole 204 connecting the first return oil cavity 104, a second return oil connecting oil hole 206 connecting the second return oil cavity 106, and a signal connecting oil hole 205 connecting the signal cavity 105. The valve core 300 has an inner core hole 305, and the high pressure chamber 107 is disposed on the bottom cavity wall of the valve body 100. The valve core 300 includes a core body 301, a first annular platform 303 disposed on the core body 301, and a second annular platform 304 located below the first annular platform 303. The core body 301 has an annular groove 302. The outer diameter of the first annular platform 303 is larger than the outer diameter of the second annular platform 304, and the outer diameter of the second annular platform 304 is larger than the outer diameter of the core body 301.

[0030] The valve sleeve 200 adopts a split structure. The split structure of the valve sleeve 200 facilitates the installation of the valve core 300 inside the valve sleeve 200. On the other hand, if a component of the valve sleeve 200 is damaged, the damaged component can be replaced individually without replacing the entire valve sleeve 200, thus reducing maintenance costs.

[0031] The valve sleeve 200 includes a first valve sleeve 201 and a second valve sleeve 202. The first valve sleeve 201 is located above the second valve sleeve 202. The inner diameter of the upper part of the second valve sleeve 202 is adapted to the outer diameter of the first annular platform 303, and the inner diameter of the lower part of the second valve sleeve 202 is adapted to the outer diameter of the second annular platform 304. The installation of the valve core 300 and the valve sleeve 200 is more convenient. The upper part of the valve core 300 is inserted into the first valve sleeve 201, and the lower part of the valve core 300 is inserted into the second valve sleeve 202. This ensures that the valve core 300 can move up and down within the valve sleeve 200 without scratching or wearing the valve body 100. The first valve sleeve 201 and the second valve sleeve 202 are independently processed and assembled. When a valve sleeve is worn or malfunctions, only the corresponding first valve sleeve 201 or second valve sleeve 202 needs to be replaced, effectively reducing the maintenance cost of the directional valve.

[0032] The high and low pressure connecting oil hole 203, the return oil connecting oil hole one 204 and the signal connecting oil hole 205 are respectively provided on the first valve sleeve 201, and the return oil connecting oil hole two 206 is provided on the second valve sleeve 202. Alternatively, the high and low pressure connecting oil hole 203 and the first return oil connecting oil hole 204 are respectively disposed on the first valve sleeve 201, the first valve sleeve 201 and the second valve sleeve 202 are connected to form the signal connecting oil hole 205, and the second return oil connecting oil hole 206 is disposed on the second valve sleeve 202. This layout makes the internal oil circuit structure of the directional valve more reasonable, the layout between the oil holes more compact, reduces the oil circuit length and bends, thereby reducing the pressure loss of hydraulic oil during the flow process and improving the working efficiency of the hydraulic system.

[0033] The high and low pressure chambers 103, return oil chamber one 104, signal chamber 105, and return oil chamber two 106 are respectively disposed on the outer peripheral wall of the valve body 100. The reasonable distribution of each chamber on the valve seat 102 not only facilitates the flow and control of hydraulic oil but also effectively reduces mutual interference between chambers, enhances the strength and stability of the valve seat 102, improves the reliability and durability of the directional valve during operation, and ensures the long-term stable operation of the hydraulic breaker.

[0034] The valve body 100 includes a valve seat 102 and a valve cover 101 disposed on the valve seat 102, wherein the valve cover 101 presses the valve sleeve 200 into the valve seat 102. This structure ensures the stable installation of the valve sleeve 200 within the valve seat 102, effectively preventing loosening or displacement of the valve sleeve 200 during operation due to hydraulic shock. Simultaneously, the valve cover 101 provides additional protection for the valve sleeve 200, preventing external impurities or particles from entering its interior, thereby ensuring the cleanliness and performance of the directional valve. Furthermore, this structure facilitates the disassembly and replacement of the valve sleeve 200, providing convenience for subsequent maintenance and repair work. The valve core 300 is also provided with at least one oil replenishment hole 307. The valve core 300 has at least one oil replenishment hole 307, and two oil replenishment holes 307 can be provided on the core body of the valve core 300. The oil replenishment hole 307 ensures that hydraulic oil can be replenished to the signal chamber in a timely manner during the operation of the directional valve, stabilizing the pressure in the signal chamber and reducing hydraulic shock. In one scenario, when the piston of the breaker impacts downwards, the large diameter of the piston will cut off the connection between the hammer signal chamber and the hammer high-pressure chamber, making the signal chamber a closed chamber. If there is leakage in the signal chamber, for example, due to a clearance fit between the valve core and the valve sleeve, or slight scratches on the valve core and valve sleeve, the pressure in the signal chamber will leak to the upper and lower return oil chambers, causing a decrease in the signal chamber pressure, which may lead to premature valve closure. Adding a very small oil replenishment hole, which is connected to the high-pressure chamber through the inner hole of the valve core (because the valve core is already open at this time), can promptly replenish the internal leakage of pressure in the signal chamber and stabilize the pressure in the signal chamber. In another scenario, when the piston reaches the valve switching point, the signal chamber will suddenly connect with the return oil. This replenishment oil hole is still connected to the high-pressure chamber, so that the pressure in the signal chamber will not suddenly drop to the same level as the return oil chamber, thus reducing hydraulic shock.

[0035] The core body 301, located between the annular groove 302 and the first annular platform 303, is provided with a circumferential pressure equalizing groove 308. This circumferential pressure equalizing groove 308 balances the hydraulic pressure on the outer circumference of the core body 301, reducing lateral forces caused by uneven pressure that could lead to valve core 300 displacement, and effectively reducing wear between the valve core 300 and the valve sleeve 200. This not only extends the service life of the directional control valve but also ensures its stability and reliability during long-term operation.

[0036] The first annular platform 303 has a first circumferential pressure equalizing groove 309 on its outer circumferential surface. The first circumferential pressure equalizing groove 309 can balance the hydraulic pressure on the outer circumferential surface of the first annular platform 303, so that the pressure on the outer circumferential surface of the first annular platform 303 is uniform and the hydraulic pressure on the outer circumferential surface of the first annular platform 303 can be more evenly distributed, reducing the problem of valve core 300 being offset due to lateral force caused by uneven circumferential pressure, reducing wear between valve core 300 and valve sleeve 200, and further extending the service life of the directional valve.

[0037] The second annular platform 304 has a second circumferential pressure equalizing groove 310 on its outer circumferential surface. The second circumferential pressure equalizing groove 310 can balance the hydraulic pressure on the outer circumferential surface of the second annular platform 304, reduce the lateral force caused by uneven circumferential pressure, reduce the wear between the valve core 300 and the valve sleeve 200, and extend the service life of the directional valve core 300 and the valve sleeve 200.

[0038] The first annular platform 303 is provided with at least one oil drain groove 306. The oil drain grooves 306 are evenly distributed on the outer circumference of the first annular platform. On the one hand, they can reduce hydraulic shock. When the signal chamber is connected to high pressure, the pressure can be slightly released through the oil drain grooves 306 to reduce hydraulic shock. On the other hand, they can release the pressure leaking into the signal chamber through the piston and cylinder, preventing the valve from opening prematurely. As the piston rises, the distance between the high-pressure chamber of the sealing hammer and the hammer signal chamber becomes shorter and shorter, and the pressure leaking into the hammer signal chamber will become higher and higher. The valve gap and diameter are smaller than the piston, so the pressure leaking through the valve will be smaller, and the pressure in the signal chamber will become higher and higher. Without the oil drain groove, the reversing valve may have already opened before the piston connects to the hammer signal chamber.

[0039] A plug 400 is provided at the bottom of the valve body 100, and the plug 400 is located below the high-pressure chamber 107. The installation position of the plug 400 facilitates the machining of the oil chamber inside the valve body 100. The plug 400 can effectively prevent hydraulic oil leakage in the high-pressure chamber 107, ensure the stability of the hydraulic system during the operation of the directional valve, and also block external impurities from entering the high-pressure chamber 107, thereby improving the reliability and durability of the directional valve.

[0040] like Figures 7-11 As shown, a hydraulic breaker includes a housing, a piston 501, and a chisel 502, as well as a hydraulic breaker directional valve as described above. The housing includes a front housing 503, a rear housing 504, and a cylinder 505 disposed between the front and rear housings. The cylinder is provided with a hammer high / low pressure conversion chamber 506, a hammer return oil chamber 507, a hammer signal chamber 508, and a hammer high pressure chamber 509, which are correspondingly connected to the hydraulic oil chambers. The hammer high / low pressure conversion chamber 506, hammer return oil chamber 507, hammer signal chamber 508, and hammer high pressure chamber 509 are sequentially arranged on the inner wall of the cylinder 505 from top to bottom. A nitrogen chamber 510 is provided inside the rear housing 504.

[0041] The piston 501 has a pressure relief ring groove 511 in the middle, and a rear boss is provided on the piston 501 located behind the pressure relief ring groove 511. At least one vertical pressure relief groove 512 is provided on the rear boss.

[0042] in Figure 5 In the order φd3>φd4>φd5>φd6; Figure 7 or Figure 11 For the middle piston, φD3 > φD4 > φD5; In the initial state during operation, the role of nitrogen in the nitrogen chamber of the hydraulic breaker is as follows: Figure 7As shown, piston 501 is located at the end closest to chisel 502. When the excavator provides pressure, at the instant high-pressure oil is introduced, the high-pressure oil enters the cylinder 505 and the interior of the reversing valve. The high-low pressure switching chamber of the hammer is connected to the high-low pressure chamber of the reversing valve. The high-low pressure chamber of the reversing valve is connected to the return oil chamber through an annular groove. Since φD3>φD4, the piston moves upward under the pressure of the high-pressure chamber. When the piston moves to... Figure 9 In position, the hammer high-pressure chamber is connected to the hammer signal chamber, and the hammer signal chamber is connected to the signal chamber of the directional valve. High pressure reaches the signal chamber of the directional valve through the signal oil passage. Since φd3>φd4>φd5>φd6, and the annular area Sa formed by φd3 and φd5 plus the annular area Sb formed by φd5 and φd6 is greater than the annular area Sc formed by φd4 and φd6 (i.e., Sa+Sb>Sc), the resultant force on the upper end face of the directional valve core is greater than the resultant force on its lower end face. Therefore, under the action of high pressure, the valve core moves downward, and the valve core moves down. Figure 3 As shown, the high-pressure chamber can be connected to the high-low pressure chamber through the inner hole of the core. The high-low pressure chamber is connected to the high-pressure chamber, so that the pressure in the high-low pressure chamber changes from low pressure to high pressure. Since the piston's φD3>φD4>φD5, the annular area S3 formed by φD3 and φD5 is greater than the annular area S4 formed by φD3 and φD4 (i.e., S3>S4). Therefore, under the action of high pressure and nitrogen gas above the piston, the piston impacts the drill rod downwards. Figure 7 For the position where the piston strikes the drill rod, in Figure 7 In position, the hammer signal chamber 508 is connected to the return oil via a vertical pressure relief groove 512. Using a vertical pressure relief groove 512 instead of an annular groove increases the contact area between the piston and the cylinder, improving stability. When the piston 501 moves downwards and is about to hit the chisel 502, the hammer signal chamber connects to the hammer return oil chamber via the pressure relief annular groove 511 in the middle of the piston and the vertical pressure relief groove 512. The valve signal chamber connects to the hammer signal chamber, releasing the pressure in the valve signal chamber. The pressure Sa acting on the valve changes from high pressure to low pressure. Under the high pressure of the Sc and Sb surfaces (Sc>Sb), the valve core moves upwards, closing the reversing valve and switching the high pressure in the high and low pressure chambers to low pressure. This completes one impact cycle, and the piston repeats the above process to complete the crushing task.

[0043] This invention reduces pressure loss during high-pressure oil flow, improves the flow capacity of high-pressure oil, and thus enhances the hydraulic efficiency of the hydraulic breaker. The valve core of the directional control valve moves up and down within the valve sleeve. Even if there are scratches between the valve core and the valve sleeve, only the valve sleeve needs to be replaced, without replacing the valve body, reducing the maintenance cost of the directional control valve. The valve core does not have various oil passages machined on it, enhancing its strength. The high overall strength of the valve core makes it less prone to deformation under high pressure and high temperature, extending the service life of the directional control valve and ensuring the stability and reliability of the hydraulic breaker's directional control valve.

[0044] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A hydraulic breaker directional valve, comprising a valve body (100), characterized in that, It also includes a valve sleeve (200) disposed within the valve body (100) and a valve core (300) disposed within the valve sleeve (200). The valve core (300) is capable of moving up and down within the valve sleeve (200). The cavity wall of the valve body (100) is provided with a high and low pressure cavity (103), a return oil cavity one (104), a signal cavity (105), a return oil cavity two (106), and a high pressure cavity (107) in sequence from top to bottom. The valve sleeve (200) is provided with a high and low pressure connecting oil hole (203) connecting the high and low pressure cavity (103), a return oil connecting oil hole one (204) connecting the return oil cavity one (104), a return oil connecting oil hole two (206) connecting the return oil cavity two (106), and a signal connecting oil hole (205) connecting the signal cavity (105). The valve core (300) has an inner core hole (305), and the high pressure chamber (107) is located on the bottom cavity wall of the valve body (100); The valve core (300) includes a core body (301), a first annular platform (303) disposed on the core body (301), and a second annular platform (304) located below the first annular platform (303). The core body (301) is provided with an annular groove (302). The outer diameter of the first annular platform (303) is larger than the outer diameter of the second annular platform (304), and the outer diameter of the second annular platform (304) is larger than the outer diameter of the core body (301).

2. The hydraulic breaker directional valve according to claim 1, characterized in that, The valve sleeve (200) adopts a split structure.

3. The hydraulic breaker directional valve according to claim 2, characterized in that, The valve sleeve (200) includes a first valve sleeve (201) and a second valve sleeve (202). The first valve sleeve (201) is located above the second valve sleeve (202). The inner diameter of the upper part of the second valve sleeve (202) is adapted to the outer diameter of the first annular platform (303), and the inner diameter of the lower part of the second valve sleeve (202) is adapted to the outer diameter of the second annular platform (304).

4. The hydraulic breaker directional valve according to claim 3, characterized in that, The high and low pressure connecting oil hole (203), the return oil connecting oil hole one (204) and the signal connecting oil hole (205) are respectively provided on the first valve sleeve (201), and the return oil connecting oil hole two (206) is provided on the second valve sleeve (202); Alternatively, the high and low pressure connecting oil hole (203) and the return oil connecting oil hole one (204) are provided on the first valve sleeve (201), the first valve sleeve (201) and the second valve sleeve (202) are connected to form the signal connecting oil hole (205), and the return oil connecting oil hole two (206) is provided on the second valve sleeve (202).

5. The hydraulic breaker directional valve according to claim 1, characterized in that, The high and low pressure chamber (103), the first oil return chamber (104), the signal chamber (105), and the second oil return chamber (106) are respectively disposed on the outer peripheral wall of the valve body (100).

6. The hydraulic breaker directional valve according to any one of claims 1-5, characterized in that, The valve body (100) includes a valve seat (102) and a valve cover (101) disposed on the valve seat (102), wherein the valve cover (101) presses the valve sleeve (200) into the valve seat (102).

7. The hydraulic breaker directional valve according to any one of claims 1-5, characterized in that, The valve core (300) is also provided with at least one oil replenishment hole (307).

8. The hydraulic breaker directional valve according to any one of claims 1-5, characterized in that, The core body (301) located between the annular groove (302) and the first annular platform (303) is provided with a main body circumferential pressure equalization groove (308).

9. The hydraulic breaker directional valve according to any one of claims 1-5, characterized in that, The first ring platform (303) has a first circumferential pressure equalization groove (309) on its outer peripheral surface; and / or the second ring platform (304) has a second circumferential pressure equalization groove (310) on its outer peripheral surface.

10. The hydraulic breaker directional valve according to any one of claims 1-5, characterized in that, The first ring platform (303) is provided with at least one oil drain groove (306).

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