Hydraulic breaking hammer reversing valve assembly
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- YANTAI BAITAI HEAT TREATMENT TECH CO LTD
- Filing Date
- 2025-07-25
- Publication Date
- 2026-07-14
Smart Images
Figure CN224496947U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of directional valve technology, and in particular to a directional valve assembly for a hydraulic breaker. Background Technology
[0002] The directional valve of a hydraulic breaker is a core component controlling its impact performance, and its performance directly affects the breaker's working efficiency, stability, and lifespan. Directional valves used in hydraulic breakers have strict requirements for sensitivity, internal leakage, and other parameters. Poor valve sensitivity can easily lead to excessive hydraulic impact force, causing damage to pipelines or hydraulic components; insufficient impact force will affect impact performance; and excessive internal leakage can easily lead to energy loss and other problems.
[0003] A utility model patent with publication number CN222413210U discloses a hydraulic breaker with a high-sensitivity reversing valve. This patent includes a chisel and an impact body. The impact rod divides the movable chamber into a first movable chamber, a second movable chamber, and a third movable chamber. The reversing valve is installed within the reversing valve chamber and has a sealing gasket. When the reversing valve moves, it can open or close the connection between the second and third reversing valve chambers. A first oil circuit connects the first movable chamber and the inlet oil circuit, a second oil circuit connects the second reversing valve and the inlet oil circuit, and one end of the third oil circuit connects to the first reversing valve chamber, while the other end moves with the impact rod and connects to the first movable chamber. The moving cavity may be connected to the second moving cavity, the fourth oil circuit is connected to the third reversing valve cavity and the third moving cavity, the return oil circuit is connected to the second moving cavity and the third moving cavity, and the force-bearing area of the impact rod facing the third moving cavity is greater than the force-bearing area facing the first moving cavity. The related technologies, including the above-mentioned technical solutions, still have many problems, such as: the high-pressure oil inlet pipeline is prone to unstable oil pressure, which causes the power components to shake or have insufficient impact force when moving; secondly, the conventional reversing valve has a large internal leakage and slow reversing speed, which leads to insensitive reversing and low reversing efficiency; in addition, cavitation is prone to occur during oil return, which leads to unstable oil return. Utility Model Content
[0004] The purpose of this utility model is to provide a hydraulic breaker reversing valve assembly to solve the technical problems of poor reversing sensitivity and low reversing efficiency caused by unstable hydraulic oil pressure that are common in existing reversing valves.
[0005] To achieve the above objectives, this utility model provides the following technical solution:
[0006] A hydraulic breaker directional valve assembly includes a valve seat, a valve sleeve, and a valve core.
[0007] The valve seat is provided with an oil inlet and an oil outlet, as well as a main oil chamber connected to the oil inlet, and the valve seat is provided with a first output oil passage or a second output oil passage connected to the main oil chamber.
[0008] The valve seat is also provided with a connecting cavity for connecting the accumulator. One end of the connecting cavity is connected to the accumulator, and the other end is connected to the main oil chamber.
[0009] The valve sleeve is fixedly installed inside the valve seat, and the valve core is slidably installed inside the valve sleeve. When the valve core slides, it realizes the switching of two oil circuits. One oil circuit is an oil inlet connected to the main oil chamber, and the main oil chamber is connected to the accumulator and the first output oil circuit respectively. The other oil circuit is an oil inlet connected to the main oil chamber, and the main oil chamber is connected to the accumulator and the second output oil circuit respectively.
[0010] Furthermore, the outer circumferential surface of the valve sleeve is provided with several annular grooves, and its inner cavity wall is provided with several annular grooves that correspond one-to-one. The annular grooves that correspond to each other are connected to form an annular cavity. The annular cavity includes a first annular cavity, a second annular cavity, a third annular cavity, a fourth annular cavity, and a fifth annular cavity. The third annular cavity is connected to the main oil cavity, the first annular cavity is connected to the feedback oil circuit, and the feedback oil circuit is connected to the bottom end face of the valve seat.
[0011] Furthermore, the outer peripheral wall of the valve core is provided with three annular grooves, namely a first annular groove, a second annular groove, and a third annular groove. A first sealing cavity is provided at the left end of the valve core, and a second sealing cavity with a cross-sectional area smaller than that of the first sealing cavity is provided at the right end. A left positioning pin for sealing the first sealing cavity is slidably installed at the left end of the valve core, and a right positioning pin for sealing the second sealing cavity is slidably installed at the right end of the valve core. Both the first and second sealing cavities are provided with through holes along the radial direction, wherein the through hole of the second sealing cavity communicates with the second annular groove. When the valve core is located at the left end limit position, the first annular groove communicates with the second annular cavity, the second annular groove communicates with the third annular cavity, the third annular groove communicates with the fourth and fifth annular cavities simultaneously, and the first sealing cavity communicates with the first annular cavity. When the valve core is located at the right end limit position, the first annular groove communicates with the second and third annular cavities simultaneously, the second annular groove communicates with the third and fourth annular cavities simultaneously, the third annular groove communicates with the fifth annular cavity, and the through hole of the first sealing cavity communicates with the first annular groove.
[0012] Furthermore, a front flange cover and a rear flange cover are also installed on the valve seat, wherein the front flange cover and the rear flange cover are respectively tightened to the two end faces of the valve sleeve, and the left locating pin and the right locating pin respectively abut against the rear flange cover and the front flange cover at the ends away from the valve core.
[0013] Furthermore, a left valve cover and a right valve cover are also installed on the valve seat. A one-way valve is installed on the left valve cover. The one-way valve is installed in series between the oil inlet and the main oil inlet circuit. The main oil inlet circuit is connected to the main oil chamber. An overflow valve is installed between the right valve cover and the valve seat. The overflow valve is connected in parallel with the return oil circuit and then connected to the oil outlet. The inlet of the overflow valve is connected to the first output oil circuit through the pilot oil circuit. The return oil circuit includes a horizontal section and a vertical section connected to it. The horizontal section of the return oil circuit is also connected to the left end chamber and the right end chamber. The left end chamber is a cavity formed by the valve seat, the rear flange cover, the left end face of the valve sleeve, and the left positioning pin. The right end chamber is a cavity formed by the valve seat, the front flange cover, the right end face of the valve sleeve, and the right positioning pin.
[0014] Furthermore, the overflow valve includes an overflow valve sleeve, an overflow valve core, and an overflow elastic element. The overflow valve sleeve is fixedly installed relative to the valve seat. The overflow valve core is slidably installed in the inner cavity of the overflow valve sleeve, and the overflow elastic element is installed between the right side of the overflow valve core and the right valve cover. An overflow annular groove and an annular end face are provided on the outer periphery of the overflow valve core. The diameter of the left side of the annular end face is smaller than the diameter of the right side, and the cavity formed by the annular end face and the overflow valve sleeve is connected to the pilot oil circuit through a through hole penetrating the overflow valve core. The inner cavity of the overflow valve sleeve is provided with two annular grooves, namely a fourth annular groove and a fifth annular groove. The fifth annular groove is connected to the oil outlet. When the overflow valve core is located at the leftmost position of the stroke, the overflow annular groove of the overflow valve core is connected to the fourth annular groove of the overflow valve sleeve. The fourth annular groove is connected to the fifth annular cavity through the return oil channel. When the overflow valve core is located at the rightmost position of the stroke, the overflow annular groove of the overflow valve core is connected to the fourth and fifth annular grooves of the overflow valve sleeve.
[0015] Furthermore, the outer peripheral wall of the overflow valve sleeve is provided with a sixth annular cavity and a seventh annular cavity that are respectively connected to the fourth annular groove and the fifth annular groove. The fourth annular groove and the sixth annular cavity are connected through a number of radial through holes, and the fifth annular groove and the seventh annular cavity are connected through a number of radial through holes. The fourth annular groove is connected to the fifth annular cavity through a return oil channel, and the fifth annular groove is connected to the oil outlet through a radial through hole.
[0016] Furthermore, the first output oil path is configured as two oil paths that are both connected to the third annular cavity and spaced 180° apart, and the second output oil path is configured as four oil paths, of which two are connected to the second annular cavity and spaced 180° apart, and the other two are connected to the fourth annular cavity and spaced 180° apart.
[0017] Furthermore, the valve seat is sealed to the valve sleeve, the valve seat is sealed to the front flange cover and the rear flange cover, the valve seat is sealed to the left valve cover and the right valve cover, the overflow valve sleeve is sealed to the valve seat, and the inlet flange and the outlet flange are sealed to the valve seat respectively.
[0018] Furthermore, the oil inlet and oil outlet are respectively equipped with an oil inlet flange and an oil outlet flange, and the overflow elastic element is a spring.
[0019] Compared with the prior art, the technical solution of this utility model has the following beneficial effects:
[0020] (1). This utility model achieves rapid switching between the first output oil circuit and the second output oil circuit by setting relative sliding between the valve core and the valve sleeve. At the same time, a valve sleeve is set between the valve seat and the valve core. When the valve sleeve is damaged, only the valve sleeve needs to be replaced, which effectively reduces the equipment cost. In addition, by setting an accumulator, energy is effectively stored and converted, thereby increasing the output oil pressure of the hydraulic oil circuit of the reversing valve, which is beneficial to improving the striking force of the hydraulic breaker.
[0021] (2). By setting a one-way valve at the oil inlet, this utility model helps to prevent hydraulic oil backflow and thus ensures the stability of hydraulic oil pressure when the oil supply pressure is low. In addition, by setting an overflow valve and a pilot oil circuit, it is beneficial to relieve pressure and return oil, ensuring the normal operation of the directional valve. By setting the number and angle of the first and second output oil circuits, it is beneficial to improve the oil pressure dynamic balance when the oil circuit outputs, thereby improving the stability of the oil circuit output. Attached Figure Description
[0022] Figure 1 This is a three-dimensional structural diagram of the present invention;
[0023] Figure 2 This is a schematic diagram of the main structure of this utility model;
[0024] Figure 3 This is a top view of the structure of this utility model;
[0025] Figure 4 This is a bottom view of the structure of this utility model;
[0026] Figure 5 for Figure 2 A cross-sectional view of the valve core at the rightmost limit position at point AA.
[0027] Figure 6 for Figure 3 Schematic diagram of the cross-sectional structure at the CC point;
[0028] Figure 7 for Figure 4 Schematic diagram of the cross-sectional structure at the middle EE;
[0029] Figure 8 for Figure 4 A schematic diagram of the cross-sectional structure at the middle GG point;
[0030] Figure 9for Figure 4 Schematic diagram of the cross-sectional structure at point DD;
[0031] Figure 10 for Figure 2 Schematic diagram of the cross-sectional structure at point BB;
[0032] Figure 11 This is a three-dimensional structural diagram of the valve sleeve;
[0033] Figure 12 This is a three-dimensional structural diagram of the valve core;
[0034] Figure 13 for Figure 6 A magnified schematic diagram of the structure at point F in the middle;
[0035] Figure 14 A three-dimensional structural diagram of the overflow valve core;
[0036] Figure 15 A three-dimensional structural diagram of the overflow valve sleeve;
[0037] Figure 16 for Figure 15 A schematic diagram of the cross-sectional structure at point HH;
[0038] Figure 17 This is a schematic diagram of the cross-sectional structure of the valve core at the leftmost limit position.
[0039] In the diagram: 100, valve seat; 101, inlet flange; 102, outlet flange; 103, right valve cover; 1031, relief valve; 10311, relief valve sleeve; 103111, fourth annular groove; 103112, fifth annular groove; 103113, sixth annular cavity; 103114, seventh annular cavity; 103115, eighth annular cavity; 10312, relief valve core; 103121, relief annular groove; 103122, annular end face; 10313, Overflow elastic element; 104, Front flange cover; 105, Left valve cover; 1051, Check valve; 106, Rear flange cover; 107, Connecting cavity; 108, Main oil cavity; 109, First output oil circuit; 110, Second output oil circuit; 111, Main oil inlet circuit; 112, Feedback oil circuit; 113, Horizontal section of return oil circuit; 114, Pilot oil circuit; 115, Vertical section of return oil circuit; 116, Left end cavity; 117, Right end cavity; 118, Return oil passage;
[0040] 200. Valve sleeve; 201. First annular cavity; 202. Second annular cavity; 203. Third annular cavity; 204. Fourth annular cavity; 205. Fifth annular cavity;
[0041] 300, Valve core; 301, First annular groove; 302, Second annular groove; 303, Third annular groove; 304, First sealing cavity; 305, Second sealing cavity;
[0042] 400, Left locating pin;
[0043] 500, right locating pin. Detailed Implementation
[0044] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0045] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent.
[0046] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments of this application. The singular forms “a,” “described,” and “…” used in the embodiments of this application and the appended claims are also considered.
[0047] The word "the" is also intended to include the majority form unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and includes any or all possible combinations of one or more associated listed items.
[0048] In the following description, when referring to the accompanying drawings, the same numbers in different drawings denote the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.
[0049] In the description of this application, it should be understood that the terms "first," "second," "third," etc., are used only to distinguish similar objects and are not necessarily used to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0050] Furthermore, in the description of this application, unless otherwise stated, "multiple" means two or more. "And / or"
[0051] The description of the relationship between associated objects indicates that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The character " / " generally indicates that the preceding and following associated objects have an "OR" relationship. The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0052] To address the limitations of existing technologies, this embodiment provides a technical solution. The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.
[0053] This utility model is a technical improvement aimed at addressing the common technical problems of unstable oil pressure and low reversing efficiency in the reversing valves used in hydraulic breakers in the prior art. It discloses a hydraulic breaker reversing valve assembly, which provides two output oil paths for the piston of the hydraulic breaker, thereby realizing the upward or downward movement of the piston and thus realizing the striking operation of the hydraulic breaker.
[0054] See appendix Figure 1-6A hydraulic breaker directional valve assembly includes a valve seat 100, a valve sleeve 200, and a valve core 300. The valve seat 100 is provided with an oil inlet and an oil outlet, as well as a main oil chamber 108 communicating with the oil inlet. The valve seat 100 is also provided with a first output oil passage 109 or a second output oil passage 110 communicating with the main oil chamber 108. An oil inlet flange 101 and an oil outlet flange 102 are respectively installed on the oil inlet and the oil outlet, and the oil inlet flange 101 and the oil outlet flange 102 are respectively sealed to the valve seat 100. Understandably, the oil inlet connects to the high-pressure oil supply tank, and the oil outlet connects to the supply tank for hydraulic oil return. Here, the first output oil path 109 or the second output oil path 110 are two different output oil paths, each connected to one of the two chambers of the hydraulic hammer piston. When oil flows through these two chambers, it pushes the piston to move in opposite directions. The valve seat 100 is also provided with a connecting chamber 107 for connecting to the accumulator. The accumulator is an energy storage device in a hydraulic-pneumatic system. It converts the energy in the system into compressible energy or potential energy at appropriate times and stores it. When the system needs it, it converts the compressible energy or potential energy into hydraulic or pneumatic energy and releases it to replenish the system. When the system pressure increases instantaneously, it can absorb this energy to ensure that the pressure of the entire system remains normal. One end of the connecting cavity 107 is connected to the accumulator, and the other end is connected to the main oil cavity 108. The valve sleeve 200 is relatively fixedly installed inside the valve seat 100. This relative fixation can be understood as an interference fit between the valve sleeve 200 and the valve seat 100. The contact surfaces between the valve sleeve 200 and the valve seat 100 are provided with sealing rings for sealing. The valve core 300 is slidably installed inside the valve sleeve 200. When the valve core 300 slides, it realizes the switching of two oil circuits. One oil circuit is an oil inlet connected to the main oil cavity 108, and the main oil cavity 108 is connected to the accumulator and the first output oil circuit 109 respectively. The other oil circuit is an oil inlet connected to the main oil cavity 108, and the main oil cavity 108 is connected to the accumulator and the second output oil circuit 110 respectively. It can be understood here that the accumulator is a bladder-type accumulator, which is divided into two chambers separated by a diaphragm. One chamber contains nitrogen, and the other chamber is connected to the main oil chamber 108 through the connecting chamber 107. When the first output oil circuit 109 is connected, the pressure rises, the oil enters the accumulator, and the nitrogen is compressed until the system pipeline pressure no longer rises. When the pipeline pressure drops, the compressed air expands and forces the oil back into the circuit, thereby slowing down the drop in pipeline pressure.
[0055] Specifically, the outer circumferential surface of the valve sleeve 200 is provided with several annular grooves, and its inner cavity wall is provided with several annular grooves with corresponding positions. The annular grooves with corresponding positions are connected to each other to form an annular cavity. This connection can be understood as the corresponding annular grooves being connected through radially penetrating through holes. The annular cavity includes a first annular cavity 201, a second annular cavity 202, a third annular cavity 203, a fourth annular cavity 204, and a fifth annular cavity 205 arranged sequentially along the axial direction. The third annular cavity 203 is connected to the main oil cavity 108, and the first annular cavity 201 is connected to the feedback oil passage 112. The feedback oil passage 112 is connected to the bottom end face of the valve seat 100. The outer circumferential wall of the valve core 300 is provided with three annular grooves, namely the first annular groove 301, the second annular groove 302, and the third annular groove 303 arranged sequentially along the axial direction. The width of the second annular groove 302 along the axial direction is greater than the wall thickness between the third annular cavity 203 and the fourth annular cavity 204. The axial width of the first annular groove 301 is greater than the wall thickness between the second annular cavity 202 and the third annular cavity 203. The axial width of the third annular groove 303 is greater than the wall thickness between the fourth annular cavity 204 and the fifth annular cavity 205. The valve core 300 has a first sealing cavity 304 at its left end and a second sealing cavity 305 with a cross-sectional area smaller than that of the first sealing cavity 304 at its right end. It can be understood that both the first sealing cavity 304 and the second sealing cavity 305 are cylindrical cavities. A left positioning pin 400 for sealing the first sealing cavity 304 is slidably installed at the left end of the valve core 300, and a right positioning pin 500 for sealing the second sealing cavity 305 is slidably installed at the right end of the valve core 300. Both the first sealing cavity 304 and the second sealing cavity 305 have radially arranged through holes. The through hole of the second sealing cavity 305 communicates with the second annular groove 302, and the through hole of the first sealing cavity 304 extends to the outer peripheral wall of the valve core 300. When the valve core 300 is at its left extreme position, see the attached diagram. Figure 17 At this time, the left side wall of the valve core 300 contacts the rear flange cover 106, and the volume of the first sealing cavity 304 reaches its minimum limit. At this time, the first annular groove 301 is connected to the second annular cavity 202, the second annular groove 302 is connected to the third annular cavity 203, and the third annular groove 303 is simultaneously connected to the fourth annular cavity 204 and the fifth annular cavity 205. The first sealing cavity 304 is connected to the first annular cavity 201. At this time, the hydraulic oil enters the main oil cavity 108 through the oil inlet via the check valve 1051 and simultaneously enters the accumulator and the first output oil circuit 109. When the valve core 300 is at the right end limit position, see Appendix. Figure 5The first annular groove 301 is simultaneously connected to the second annular cavity 202 and the third annular cavity 203. The second annular groove 302 is simultaneously connected to the third annular cavity 203 and the fourth annular cavity 204. The third annular groove 303 is connected to the fifth annular cavity 205. The through hole of the first sealing cavity 304 is connected to the first annular groove 301. At this time, it can be understood that the second annular cavity 202, the third annular cavity 203 and the fourth annular cavity 204 are all in a connected state. Specifically, the first output oil passage 109 is configured as two oil passages that are both connected to the third annular cavity 203 and spaced 180° apart. The second output oil passage 110 is configured as four oil passages, two of which are connected to the second annular cavity 202 and spaced 180° apart, and the other two are connected to the fourth annular cavity 204 and spaced 180° apart. Therefore, when the valve core 300 is at the leftmost extreme position, the third annular cavity 203 outputs high-pressure hydraulic oil through the two oil passages of the first output oil passage 109. When the valve core 300 is at the rightmost extreme position, the two oil passages of the second output oil passage 110 connected to the second annular cavity 202 and the fourth annular cavity 204 respectively output high-pressure hydraulic oil.
[0056] See appendix Figure 5The valve seat 100 is also detachably mounted with a front flange cover 104 and a rear flange cover 106 by screws. The valve seat 100 is sealed to the front flange cover 104 and the rear flange cover 106. The front flange cover 104 and the rear flange cover 106 are respectively tightened to the two end faces of the valve sleeve 200. The left locating pin 400 and the right locating pin 500 are respectively tightened to the rear flange cover 106 and the front flange cover 104 at the ends away from the valve core 300. It can be understood that when the first sealing cavity 304 and the second sealing cavity 305 are both filled with hydraulic oil, the left locating pin 400 and the right locating pin 500 are respectively tightened to the rear flange cover 106 and the front flange cover 104. A left valve cover 105 and a right valve cover 103 are also installed on the valve seat 100. The valve seat 100 is sealed to the left valve cover 105 and the right valve cover 103. A one-way valve 1051 is installed on the left valve cover 105. The one-way valve 1051 is connected in series between the oil inlet and the main oil inlet passage 111. The main oil inlet passage 111 is connected to the main oil chamber 108. It can be understood that the one-way valve 1051 only allows hydraulic oil to enter the main oil chamber 108 through the oil inlet and does not allow reverse flow. An overflow valve 1031 is installed between the right valve cover 103 and the valve seat 100. It can be understood that there is a cavity between the right valve cover 103 and the valve seat 100 for installing the overflow valve 1031. The outlet of the overflow valve 1031 is connected to the return oil. After the parallel connection of the oil path, the oil outlet is connected. The inlet of the overflow valve 1031 is connected to the first output oil path 109 through the pilot oil path 114. The return oil path includes a horizontal section 113 connected in series and a vertical section 115 connected to it. The horizontal section 113 of the return oil path is also connected to the left end cavity 116 and the right end cavity 117. The left end cavity 116 is a cavity formed by the valve seat 100, the rear flange cover 106, the left end face of the valve sleeve 200, and the left positioning pin 400. The right end cavity 117 is a cavity formed by the valve seat 100, the front flange cover 104, the right end face of the valve sleeve 200, and the right positioning pin 500. The vertical section 115 of the return oil path is connected to the bottom end face of the valve seat 100 and is used to connect to the return oil cavity between other equipment such as the piston and the piston cylinder for oil return.
[0057] See appendix Figure 6-10 and appendix Figure 13The overflow valve 1031 includes an overflow valve sleeve 10311, an overflow valve core 10312, and an overflow elastic element 10313. The overflow elastic element 10313 is a spring. The overflow valve sleeve 10311 is fixedly installed relative to the valve seat 100, and the overflow valve sleeve 10311 and the valve seat 100 are sealed together. The overflow valve core 10312 is slidably installed in the inner cavity of the overflow valve sleeve 10311, and the overflow elastic element 10313 is installed between the right side of the overflow valve core 10312 and the right valve cover 103. An overflow annular groove 103121 and an annular end face 103122 are provided on the outer periphery of the overflow valve core 10312. The diameter of the left side of the annular end face 103122 is smaller than the diameter of the right side, and the diameter of the annular end face 103122 is smaller than the diameter of the right side. 2. The cavity formed by the overflow valve sleeve 10311 and the overflow valve core 10312 communicates with the eighth annular cavity 103115 provided on the outer peripheral wall of the overflow valve sleeve 10311 through a through hole. The eighth annular cavity 103115 is connected to the pilot oil passage 114, and the other end of the pilot oil passage 114 is connected to the first output oil passage 109. The inner cavity of the overflow valve sleeve 10311 is provided with two annular grooves, namely the fourth annular groove 103111 and the fifth annular groove 103112. The fourth annular groove 103111 is connected to the outer peripheral wall of the overflow valve sleeve 10311 through a radially provided through hole, and the fifth annular groove 103112 is connected to the oil outlet through a radial through hole. When the overflow valve core 10312 is located at the leftmost position of the stroke, that is, when the overflow valve core 10312 is located at the leftmost position of the stroke, the overflow valve core 10312 is connected to the oil outlet. Figure 13 In the state where the overflow valve core 10312 is in the overflow annular groove 103121, it is connected to the fourth annular groove 103111 of the overflow valve sleeve 10311. The fourth annular groove 103111 is connected to the fifth annular cavity 205 through the return oil channel 118. When the overflow valve core 10312 is located at the rightmost position of the stroke, the overflow annular groove 103121 of the overflow valve core 10312 is connected to the fourth annular groove 103111 and the fifth annular groove 103112 of the overflow valve sleeve 10311. The outer peripheral wall of the overflow valve sleeve 10311 is provided with a sixth annular cavity 103113 and a seventh annular cavity 103114 that are respectively connected to the fourth annular groove 103111 and the fifth annular groove 103112. The fourth annular groove 103111 and the sixth annular cavity 103113 are connected through a number of radial through holes. The fifth annular groove 103112 and the seventh annular cavity 103114 are connected through a number of radial through holes. The fourth annular groove 103111 is connected to the fifth annular cavity 205 through a return oil channel 118 provided inside the valve seat 100. The fifth annular groove 103112 is connected to the oil outlet through a radial through hole.
[0058] When the directional valve of this utility model is working, high-pressure hydraulic oil enters the check valve 1051 inside the valve seat 100 through the inlet flange 101, and then enters the main oil inlet circuit 111 through the check valve 1051. At this time, the valve core 300 is in the closed state. Figure 17In the leftmost extreme position, hydraulic oil enters one oil passage of the first output oil passage 109 via the main oil inlet passage 111, and the other enters the main oil chamber 108 and simultaneously enters the accumulator and the third annular chamber 203. The hydraulic oil in the third annular chamber 203 enters the other oil passage of the first output oil passage 109. At this time, the nitrogen chamber in the accumulator is compressed, absorbs hydraulic energy, and stores it. Simultaneously, the fourth annular chamber 204 and the fifth annular chamber 205 are connected. The fifth annular chamber 205 is connected to the return oil passage, while the fourth annular chamber 204 is connected to the second output oil passage 110, returning the hydraulic oil in the piston chamber b connected to the second output oil passage 110. The first output oil passage 109 then outputs high-pressure hydraulic oil. Hydraulic oil is pumped into the piston chamber a of the hydraulic hammer, driving the piston to move. Simultaneously, a portion of the high-pressure oil from the pilot oil circuit 114, connected to the first output oil circuit 109, enters the overflow valve 1031, pushing the overflow valve core 10312 to move and compress the overflow spring. The overflow annular groove 103121 connects with the fourth annular groove 103111 and the fifth annular groove. The fifth annular cavity 205 connects with the fourth annular groove 103111, while the fifth annular groove 103112 connects with the oil outlet to form a return oil passage. When the piston reaches a certain stroke, the first output oil circuit 109 connects with the feedback oil circuit 112, and the hydraulic oil from the feedback oil circuit 112 enters the first annular cavity 201. Hydraulic oil enters the first sealed chamber 304, pushing the valve core 300 to move and open it. This means the third annular chamber 203 is connected to the fourth annular chamber 204 and the second annular chamber 202. At this time, the hydraulic oil in the main oil chamber 108 switches to the second output oil circuit 110 to output hydraulic oil. Simultaneously, the accumulator releases its stored energy. The hydraulic oil output from the second output oil circuit 110 acts on another piston chamber b of the hydraulic hammer, causing the piston to move along the opposite path. At the same time, the third annular chamber 203 connects to the second annular groove 302 of the valve core 300, and hydraulic oil enters the second sealed chamber 305. As the piston continues to descend, the feedback oil circuit 112 connects with the return oil circuit. In cavity 107, the return oil circuit is connected to the fifth annular cavity 205. The fifth annular cavity 205 is connected to the fourth annular groove 103111 and the fifth annular groove 103112 of the overflow valve sleeve 10311, and then returns oil through the oil outlet. At the same time, the overflow valve 1031 is closed. The cross-sectional area of the second sealing cavity 305 is smaller than that of the first sealing cavity 304. Therefore, the second sealing cavity 305 moves the valve core 300 to close it under the action of hydraulic oil. The connection between the third annular cavity 203, the second annular cavity 202 and the fourth annular cavity 204 is cut off. At this time, the second output oil circuit 110 is switched to the first output oil circuit 109. This is repeated to realize the upward or downward movement of the piston.
Claims
1. A hydraulic breaker directional valve assembly, characterized in that, Includes valve seat (100), valve sleeve (200), and valve core (300): The valve seat (100) is provided with an oil inlet and an oil outlet, as well as a main oil chamber (108) connected to the oil inlet, and the valve seat (100) is provided with a first output oil passage (109) or a second output oil passage (110) connected to the main oil chamber (108). The valve seat (100) is also provided with a connecting cavity (107) for connecting the accumulator. One end of the connecting cavity (107) is connected to the accumulator, and the other end is connected to the main oil chamber (108). The valve sleeve (200) is fixedly installed inside the valve seat (100), and the valve core (300) is slidably installed inside the valve sleeve (200). When the valve core (300) slides, it realizes the switching of two oil circuits. One oil circuit is an oil inlet connected to the main oil chamber (108), and the main oil chamber (108) is connected to the accumulator and the first output oil circuit (109) respectively. The other oil circuit is an oil inlet connected to the main oil chamber (108), and the main oil chamber (108) is connected to the accumulator and the second output oil circuit (110) respectively.
2. The hydraulic breaker directional valve assembly according to claim 1, characterized in that, The valve sleeve (200) has several annular grooves on its outer circumferential surface and several annular grooves with corresponding positions on its inner cavity wall. The annular grooves with corresponding positions are connected to form an annular cavity. The annular cavity includes a first annular cavity (201), a second annular cavity (202), a third annular cavity (203), a fourth annular cavity (204), and a fifth annular cavity (205). The third annular cavity (203) is connected to the main oil cavity (108), and the first annular cavity (201) is connected to the feedback oil passage (112). The feedback oil passage (112) is connected to the bottom end face of the valve seat (100).
3. The hydraulic breaker directional valve assembly according to claim 2, characterized in that, The valve core (300) has three annular grooves on its outer peripheral wall, namely a first annular groove (301), a second annular groove (302), and a third annular groove (303). A first sealing cavity (304) is provided at the left end of the valve core (300), and a second sealing cavity (305) with a cross-sectional area smaller than the first sealing cavity (304) is provided at the right end. A left positioning pin (400) for sealing the first sealing cavity (304) is slidably installed at the left end of the valve core (300), and a right positioning pin (500) for sealing the second sealing cavity (305) is slidably installed at the right end of the valve core (300). Both the first sealing cavity (304) and the second sealing cavity (305) have radially arranged through holes, wherein the through hole of the second sealing cavity (305) communicates with the second annular groove (302). The valve core (300) is positioned... When the valve core (300) is at the left end limit position, the first annular groove (301) is connected to the second annular cavity (202), the second annular groove (302) is connected to the third annular cavity (203), the third annular groove (303) is connected to the fourth annular cavity (204) and the fifth annular cavity (205) at the same time, and the first sealing cavity (304) is connected to the first annular cavity (201). When the valve core (300) is at the right end limit position, the first annular groove (301) is connected to the second annular cavity (202) and the third annular cavity (203) at the same time, the second annular groove (302) is connected to the third annular cavity (203) and the fourth annular cavity (204) at the same time, the third annular groove (303) is connected to the fifth annular cavity (205), and the through hole of the first sealing cavity (304) is connected to the first annular groove (301).
4. The hydraulic breaker directional valve assembly according to claim 3, characterized in that, The valve seat (100) is also equipped with a front flange cover (104) and a rear flange cover (106), wherein the front flange cover (104) and the rear flange cover (106) are respectively installed to tighten against the two ends of the valve sleeve (200), and the left locating pin (400) and the right locating pin (500) are respectively tightened against the rear flange cover (106) and the front flange cover (104) at the ends away from the valve core (300).
5. A hydraulic breaker directional valve assembly according to claim 4, characterized in that, A left valve cover (105) and a right valve cover (103) are also installed on the valve seat (100). A one-way valve (1051) is installed on the left valve cover (105). The one-way valve (1051) is installed in series between the oil inlet and the main oil inlet circuit (111). The main oil inlet circuit (111) is connected to the main oil chamber (108). An overflow valve (1031) is installed between the right valve cover (103) and the valve seat (100). The overflow valve (1031) is connected in parallel with the return oil circuit and then connected to the oil outlet. The inlet of the overflow valve (1031) is connected to the first output oil circuit through the pilot oil circuit (114). The return oil circuit (109) is connected, and the return oil circuit includes a horizontal section (113) and a vertical section (115) connected to it. The horizontal section (113) of the return oil circuit is also connected to the left end cavity (116) and the right end cavity (117). The left end cavity (116) is a cavity formed by the valve seat (100), the rear flange cover (106), the left end face of the valve sleeve (200), and the left positioning pin (400). The right end cavity (117) is a cavity formed by the valve seat (100), the front flange cover (104), the right end face of the valve sleeve (200), and the right positioning pin (500).
6. A hydraulic breaker directional valve assembly according to claim 5, characterized in that, The overflow valve (1031) includes an overflow valve sleeve (10311), an overflow valve core (10312), and an overflow elastic element (10313). The overflow valve sleeve (10311) is fixedly installed relative to the valve seat (100). The overflow valve core (10312) is slidably installed in the inner cavity of the overflow valve sleeve (10311), and the overflow elastic element is installed between the right side of the overflow valve core (10312) and the right valve cover (103). (10313), the overflow valve core (10312) is provided with an overflow annular groove (103121) and an annular end face (103122) on its outer periphery. The diameter of the left side of the annular end face (103122) is smaller than that of the right side, and the cavity formed by the annular end face (103122) and the overflow valve sleeve (10311) is connected to the pilot oil passage (114) through a through hole penetrating the overflow valve core (10312). The inner cavity of the overflow valve sleeve (10311) is provided with two annular grooves, namely the fourth annular groove (103111) and the fifth annular groove (103112). The fifth annular groove (103112) is connected to the oil outlet. When the overflow valve core (10312) is located at the leftmost position of the stroke, the overflow annular groove (103121) of the overflow valve core (10312) is connected to the fourth annular groove (103111) of the overflow valve sleeve (10311). The fourth annular groove (103111) is connected to the fifth annular cavity (205) through the return oil channel (118). When the overflow valve core (10312) is located at the rightmost position of the stroke, the overflow annular groove (103121) of the overflow valve core (10312) is connected to the fourth annular groove (103111) and the fifth annular groove (103112) of the overflow valve sleeve (10311).
7. A hydraulic breaker directional valve assembly according to claim 6, characterized in that, The outer peripheral wall of the overflow valve sleeve (10311) is provided with a sixth annular cavity (103113) and a seventh annular cavity (103114) that are respectively connected to the fourth annular groove (103111) and the fifth annular groove (103112). The fourth annular groove (103111) and the sixth annular cavity (103113) are connected through a number of radial through holes, and the fifth annular groove (103112) and the seventh annular cavity (103114) are connected through a number of radial through holes. The fourth annular groove (103111) is connected to the fifth annular cavity (205) through the oil return channel (118), and the fifth annular groove (103112) is connected to the oil outlet through a radial through hole.
8. A hydraulic breaker directional valve assembly according to claim 7, characterized in that, The first output oil path (109) is configured as two oil paths that are both connected to the third annular cavity (203) and spaced 180° apart. The second output oil path (110) is configured as four oil paths, two of which are connected to the second annular cavity (202) and spaced 180° apart, and the other two are connected to the fourth annular cavity (204) and spaced 180° apart.
9. A hydraulic breaker directional valve assembly according to claim 8, characterized in that, The valve seat (100) is sealed to the valve sleeve (200), the valve seat (100) is sealed to the front flange cover (104) and the rear flange cover (106), the valve seat (100) is sealed to the left valve cover (105) and the right valve cover (103), the overflow valve sleeve (10311) is sealed to the valve seat (100), the inlet and outlet are respectively equipped with an inlet flange (101) and an outlet flange (102), and the inlet flange (101) and the outlet flange (102) are respectively sealed to the valve seat (100).
10. A hydraulic breaker directional valve assembly according to claim 9, characterized in that, The overflow elastic element (10313) is a spring.