Wear-resistant reversing valve

Abstract

The utility model provides a high wear-resistant reversing valve, which is characterized by comprising a main body valve, the main body valve comprises a valve body, a valve body mounting cavity is arranged in the valve body, a valve rod is arranged in the valve body mounting cavity in a sliding manner, and the high wear-resistant reversing valve is characterized in that a metal wear-resistant ring is arranged on the inner wall of the valve body mounting cavity; the metal wear-resistant ring is arranged outside the valve rod in a sleeving manner, and the valve rod can slide in the metal wear-resistant ring. According to the high-abrasion-resistance reversing valve, the pistons are installed at the two ends of the valve rod, the high-hardness and high-abrasion-resistance metal abrasion-resistant rings are installed between the side walls of the pistons and the valve body installation cavity, abrasion positions are located between the pistons and the abrasion-resistant rings, and due to the fact that the valve body installation cavity is high in machining precision, large in machining difficulty and high in cost, the abrasion-resistant performance is good. According to the reversing valve, by changing the abrasion position and the abrasion material, abrasion can be relieved, and meanwhile the machining cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of reversing valves, and more specifically, designs a wear-resistant reversing valve. Background Art

[0002] The description in this section merely provides background information related to the disclosure of the present utility model and does not constitute prior art.

[0003] A reversing valve is a directional control valve with more than two flow forms and more than two oil ports. It can realize the communication, cutting off and reversing of hydraulic oil flow, as well as pressure unloading and sequential action control. The oil channel is switched by the relative movement of the valve core and the valve body. There are two types: rotary valve type and sliding valve type. The reversing valve in this application is a sliding valve type reversing valve.

[0004] Patent publication number CN105201947B discloses an electro-hydraulic directional valve that hydraulically maintains the valve position. In the patent, the valve stem of the directional valve is in direct contact with the inner wall of the valve body hole. The valve stem moves back and forth in the valve body hole, which is prone to wear and tear, causing the directional valve to leak oil, resulting in the directional valve failing to switch the flow channel in a timely manner or failing to switch the flow channel.

[0005] It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solutions of the utility model and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because these solutions are described in the background technology section of the utility model. Summary of the invention

[0006] The technical problem to be solved by the utility model is to provide a wear-resistant reversing valve.

[0007] In order to solve the above technical problems, the utility model provides a wear-resistant reversing valve, characterized in that it comprises a main valve, the main valve comprises a valve body, a valve body mounting cavity is arranged in the valve body, a valve stem is slidably arranged in the valve body mounting cavity, and the utility model is characterized in that a metal wear-resistant ring is installed on the inner wall of the valve body mounting cavity, the metal wear-resistant ring is sleeved around the valve stem, and the valve stem can slide in the metal wear-resistant ring.

[0008] Preferably, the left and right ends of the valve stem are the second end and the first end respectively, the valve stem includes a valve stem body, a first piston located at the first end, and a second piston located at the second end, two metal wear-resistant rings are installed in the valve body mounting cavity, namely the first metal wear-resistant ring and the second metal wear-resistant ring, the first piston is slidably arranged in the first metal wear-resistant ring, and the second piston is slidably arranged in the second metal wear-resistant ring.

[0009] Preferably, the inner wall of the first metal wear-resistant ring and the outer wall of the first piston are sealed by a fourth sealing ring, and the inner wall of the second metal wear-resistant ring and the outer wall of the second piston are sealed by a fifth sealing ring.

[0010] Preferably, the first metal wear-resistant ring is sealed with the inner wall of the valve body installation cavity by at least one sixth sealing ring, and the second metal wear-resistant ring is sealed with the inner wall of the valve body installation cavity by at least one seventh sealing ring.

[0011] Preferably, a return spring is provided at the left end of the second piston. When the second piston slides to the left, the return spring is compressed. A second sleeve is provided on the return spring sleeve. The second sleeve is located on the left side of the second metal wear-resistant ring. The second sleeve is fixedly installed in the valve body installation cavity. The right end face of the second sleeve can contact the second sleeve to prevent the second piston from sliding further to the left.

[0012] Preferably, the right end of the first piston is provided with a first sleeve, the first sleeve is located on the right side of the first metal wear-resistant ring, the first sleeve is fixedly installed in the valve body installation cavity, and the outer wall of the first piston and the inner wall of the first sleeve are sealed by a third sealing ring.

[0013] Preferably, the valve body is also provided with an oil supply channel, a working oil channel and an oil return channel which are connected to the valve body mounting cavity. When the valve stem moves back and forth in the valve body mounting cavity, the main valve switches between a working state and an oil return state. When the main valve is in the working state, the second piston slides to the leftmost end and the return spring is compressed.

[0014] Preferably, the first piston is provided with a circle of first steps along the circumferential direction, the first step is located on the left side of the first sleeve, the side wall of the first step and the first metal wear-resistant ring are sealed by a fourth sealing ring, a valve position holding cavity is formed between the first step, the first sleeve, the first metal wear-resistant ring and the first piston, a valve position holding oil circuit is also provided in the valve body, one end of the valve position holding oil circuit is connected to the valve position holding cavity, and the other end is connected to the working oil channel.

[0015] Preferably, the right end of the first piston forms a first working chamber, and the left end of the second piston forms a second working chamber.

[0016] Preferably, the reversing valve also includes a first pilot solenoid valve and a second pilot solenoid valve, the first pilot solenoid valve is provided with a first pilot oil supply port, the valve body is provided with a first pilot oil supply circuit, one end of the first pilot oil supply port is connected to one end of the first pilot oil supply circuit, the other end of the first pilot oil supply port is connected to the first working chamber, the other end of the first pilot oil supply circuit is connected to the oil supply channel, the first pilot solenoid valve can control the on and off of the first pilot oil supply port, the second pilot solenoid valve is provided with a second pilot oil supply port, the valve body is provided with a second pilot oil supply circuit, one end of the second pilot oil supply port is connected to one end of the second pilot oil supply circuit, the other end of the second pilot oil supply port is connected to the second working chamber, the other end of the second pilot oil supply circuit is connected to the oil supply channel, the second pilot solenoid valve It is capable of controlling the on-and-off of the second pilot oil supply port, the first pilot solenoid valve is provided with a first pilot oil return port, the valve body is provided with a first pilot oil return oil circuit, one end of the first pilot oil return port is connected to one end of the first pilot oil return oil circuit, the other end of the first pilot oil return port is connected to the first working chamber, the other end of the first pilot oil return oil circuit is connected to the return oil channel, and the first pilot solenoid valve is capable of controlling the on-and-off of the first pilot oil return port; the second pilot solenoid valve is provided with a second pilot oil return port, the valve body is provided with a second pilot oil return oil circuit, one end of the second pilot oil return port is connected to one end of the second pilot oil return oil circuit, the other end of the second pilot oil return port is connected to the second working chamber, the other end of the second pilot oil return oil circuit is connected to the return oil channel, and the second pilot solenoid valve is capable of controlling the on-and-off of the second pilot oil return port.

[0017] By means of the above technical solution, the beneficial effects of the utility model are as follows:

[0018] The highly wear-resistant reversing valve of the utility model has pistons installed at both ends of the valve stem, and a high-hardness and high-wear-resistant metal wear-resistant ring is installed between the side wall of the piston and the valve body installation cavity. The wear position is between the piston and the wear-resistant ring. Since the processing precision of the valve body installation cavity is high, the difficulty is high, and the cost is high, the reversing valve of the present application can not only alleviate the wear, but also reduce the processing cost by changing the wear position and the wear material. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the reversing valve of the present application in the conductive state of the P port and the S port.

[0020] Figure 2 It is a structural schematic diagram of the reversing valve of the present application in the conducting state of the S port and the T port.

[0021] Figure 3 yes Figure 1A partial enlarged view of part A.

[0022] Figure 4 yes Figure 1 A partial enlarged view of part B.

[0023] Figure 5 It is a schematic diagram of the cross-sectional structure of the valve stem of the present application.

[0024] 10. Main valve; 1. Valve body; 2. Valve stem; 3. Second piston; 4. First piston; 5. Second pilot solenoid valve; 6. First pilot solenoid valve; 7. Return spring; 11. Oil supply channel (P port); 12. Working oil channel (S port); 13. Oil return channel (T port); 14. First oil channel cavity; 15. Second oil channel cavity; 16. Valve body installation cavity; 18. First pilot oil supply channel; 19. First pilot oil return channel; 110. Second pilot oil supply channel; 111. Second pilot oil return channel; 21. Connecting pipeline; 22. First channel; 2 3. Second channel; 24. Third channel; 25. Side hole; 41. First sleeve; 42. First sealing ring; 43. Second sealing ring; 44. Third sealing ring; 45. First step; 46. Fourth sealing ring; 47. Valve position holding cavity; 48. Valve position holding oil circuit; 31. Fifth sealing ring; 61. First pilot oil supply port; 62. First pilot oil return port; 51. Second pilot oil supply port; 52. Second pilot oil return port; 71. First metal wear-resistant ring; 711. Sixth sealing ring; 72. Second metal wear-resistant ring; 721. Seventh sealing ring. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] It should be noted that in the description of the present invention, the terms "first", "second", etc. are only used for descriptive purposes and to distinguish similar objects. There is no order of precedence between the two, and they cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0027] like Figure 1 and 2As shown, a wear-resistant reversing valve of the present application includes a main valve 10, and the main valve 10 includes a valve body 1. A valve body installation cavity 16 is provided in the valve body 1, and a valve stem 2 is slidably provided in the valve body installation cavity 16. It is characterized in that a metal wear-resistant ring is installed on the inner wall of the valve body installation cavity 16, and the metal wear-resistant ring is sleeved around the valve stem 2, and the valve stem 2 can slide in the metal wear-resistant ring.

[0028] like Figure 3 and 4 As shown, the left and right ends of the valve stem 2 are respectively the second end and the first end, the valve stem 2 includes a valve stem body, a first piston 4 located at the first end, and a second piston 3 located at the second end, and two metal wear-resistant rings are installed in the valve body installation cavity 16, namely, a first metal wear-resistant ring 71 and a second metal wear-resistant ring 72, the first piston 4 is slidably arranged in the first metal wear-resistant ring 71, and the second piston 3 is slidably arranged in the second metal wear-resistant ring 72. The inner wall of the first metal wear-resistant ring 71 and the outer wall of the first piston 4 are sealed by the fourth sealing ring 46, and the inner wall of the second metal wear-resistant ring 72 and the outer wall of the second piston 3 are sealed by the fifth sealing ring 31. The first metal wear-resistant ring 71 and the inner wall of the valve body installation cavity 16 are sealed by at least one sixth sealing ring 711, and the second metal wear-resistant ring 72 and the inner wall of the valve body installation cavity 16 are sealed by at least one seventh sealing ring 721. The highly wear-resistant reversing valve of the utility model has pistons installed at both ends of the valve stem 2, and a high-hardness and high-wear-resistant metal wear-resistant ring is installed between the side wall of the piston and the valve body installation cavity 16, and the wear position is between the piston and the wear-resistant ring. Since the processing precision of the valve body installation cavity 16 is high, the difficulty is high, and the cost is high, the reversing valve of the present application can not only alleviate the wear but also reduce the processing cost by changing the wear position and the wear material.

[0029] like Figure 4 As shown, the left end of the second piston 3 is provided with a return spring 7. When the second piston 3 slides to the left, the return spring 7 is compressed. The return spring 7 is covered with a second sleeve, which is located on the left side of the second metal wear-resistant ring 72. The second sleeve is fixedly installed in the valve body installation cavity 16. The right end face of the second sleeve can contact the second sleeve to prevent the second piston 3 from sliding further to the left. The right end of the first piston 4 is covered with a first sleeve 41, which is located on the right side of the first metal wear-resistant ring 71. The first sleeve 41 is fixedly installed in the valve body installation cavity 16. The outer wall of the first piston 4 and the inner wall of the first sleeve 41 are sealed by a third sealing ring 44.

[0030] like Figure 1 and 2As shown, the valve body is also provided with an oil supply channel 11, a working oil channel 12 and an oil return channel 13 which are connected to the valve body installation cavity 16. When the valve stem 2 reciprocates in the valve body installation cavity 16, the main valve 10 switches between the working state and the oil return state. When the main valve 10 is in the working state, the second piston 3 slides to the leftmost end, and the return spring 7 is compressed. The first piston 4 is provided with a circle of first steps 45 along the circumferential direction. The first step 45 is located on the left side of the first sleeve 41. The side wall of the first step 45 is sealed with the first metal wear-resistant ring 71 through a fourth sealing ring 46. A valve position holding cavity 47 is formed between the first step 45, the first sleeve 41, the first metal wear-resistant ring 71 and the first piston 4. A valve position holding oil path 48 is also provided in the valve body 1. One end of the valve position holding oil path 48 is connected to the valve position holding cavity 47, and the other end is connected to the working oil channel 12.

[0031] In a preferred embodiment, the main valve 10 is a two-position three-way sliding valve type hydraulically controlled reversing valve. When the main valve 10 is in a working state, the oil supply channel 11 is connected to the working oil channel 12, and the oil supply channel 11 and the working oil channel 12 are both closed to the oil return channel 13; when the main valve 10 is in an oil return state, the oil return channel 13 is connected to the working oil channel 12, and the oil return channel 13 and the working oil channel 12 are both closed to the oil supply channel 11. The valve body 1 is also provided with a first oil path chamber 14 and a second oil path chamber 15 which are connected to the valve body mounting chamber 16. The first oil path chamber 14 and the oil supply channel 11 are respectively arranged on two opposite sides of the valve body mounting chamber 16, and the second oil path chamber 15 and the working oil channel 12 are respectively arranged on two opposite sides of the valve body mounting chamber 16. Figure 5As shown, the valve stem 2 is provided with a connecting pipe 21, a first channel 22 and a second channel 23 which are perpendicular to and communicate with the connecting pipe 21, and the valve stem 2 is also provided with a third channel 24 which is not communicated with the connecting pipe 21, and the third channel 24 is communicated with a side hole 25. When the main valve 10 is in the working state, the openings at both ends of the first channel 22 are communicated with the first oil path chamber 14 and the oil supply channel 11 respectively, and the openings at both ends of the second channel 23 are communicated with the second oil path chamber 15 and the working oil channel 12 respectively, and the oil supply channel 11 is communicated with the working oil channel 12 through the connecting channel. When the main valve 10 is in the oil return state, the second oil path chamber 15 is communicated with the working oil channel 12 through the third channel 24, and the side hole 25 communicated with the third channel 24 and the oil return channel 13 are communicated through the valve body installation chamber 16, and the outlet of the oil supply channel 11 is against the surface of the valve stem 2 and is closed by the surface of the valve stem 2. The first oil path chamber 14 is coaxially arranged with the oil supply channel 11, and the second oil path chamber 15 is coaxially arranged with the working oil channel 12. When the main valve 10 is in the working state, the first oil path chamber 14, the oil supply channel 11, the second oil path chamber 15, the working oil channel 12 and the connecting channel form an H-shaped flow channel. When in the working state, the P port (oil supply channel) and the S port (working oil channel) are connected, and the high-speed hydraulic oil will not impact the surface of the valve stem 2, but will impact the inner wall of the pipeline, so that the surface of the valve stem 2 will not be cavitated and corroded. Even if the inner wall of the pipeline is cavitated and corroded under the impact of the high-speed hydraulic oil, it will not affect the sealing effect between the valve stem 2 and the valve body 1 and the communication between the oil path channel in the valve stem 2 and each oil path chamber. In addition, when in the working state, since the high-speed hydraulic oil will not vertically impact the surface of the valve stem 2, the valve stem 2 is balanced in the vertical direction and is not easy to be eccentric and deformed. The right end of the first piston 4 forms the first working chamber, and the left end of the second piston 3 forms the second working chamber.The reversing valve also includes a first pilot solenoid valve 6 and a second pilot solenoid valve 5. The first pilot solenoid valve 6 is provided with a first pilot oil supply port 61. The valve body 1 is provided with a first pilot oil supply passage 18. One end of the first pilot oil supply port 61 is connected to one end of the first pilot oil supply passage 18. The other end of the first pilot oil supply port 61 is connected to the first working chamber. The other end of the first pilot oil supply passage 18 is connected to the oil supply passage. The first pilot solenoid valve 6 can control the on-off of the first pilot oil supply port 61. The second pilot solenoid valve 5 is provided with a second pilot oil supply port 51. The valve body 1 is provided with a second pilot oil supply passage 110. One end of the second pilot oil supply port 51 is connected to one end of the second pilot oil supply passage 110. The other end of the second pilot oil supply port 51 is connected to the second working chamber. The other end of the second pilot oil supply passage 110 is connected to the oil supply passage. The second pilot solenoid valve 5 can control the on-off of the first pilot oil supply port 61. The first pilot solenoid valve 6 is provided with a first pilot oil return port 62, and the valve body 1 is provided with a first pilot oil return oil circuit 19. One end of the first pilot oil return port 62 is connected to one end of the first pilot oil return oil circuit 19, and the other end of the first pilot oil return port 62 is connected to the first working chamber, and the other end of the first pilot oil return oil circuit 19 is connected to the oil return channel 13. The first pilot solenoid valve 6 can control the first pilot oil return port 6 2 is on and off; the second pilot solenoid valve 5 is provided with a second pilot oil return port 52, and the valve body 1 is provided with a second pilot oil return oil circuit 111, one end of the second pilot oil return port 52 is connected to one end of the second pilot oil return oil circuit 111, the other end of the second pilot oil return port 52 is connected to the second working chamber, and the other end of the second pilot oil return oil circuit 111 is connected to the return oil channel 13, and the second pilot solenoid valve 5 can control the on and off of the second pilot oil return port 52.

[0032] The working principle of the reversing valve of this application is as follows:

[0033] The first pilot solenoid valve 6 is energized, the first pilot oil supply port 61 is opened, the first pilot oil return port 62 is closed, and the oil in the oil supply channel 11 enters the first working chamber 112 through the first pilot oil supply oil passage 18 and the first pilot oil supply port 61, exerting a thrust on the valve stem 2, the valve stem 2 moves to the left, compressing the return spring 7, and the main valve 10 is in a working state. The openings at both ends of the first channel 22 are respectively connected to the first oil circuit chamber 14 and the oil supply channel 11, and the openings at both ends of the second channel 23 are respectively connected to the second oil circuit chamber 15 and the working oil channel 12. The oil supply channel 11 is connected to the working oil channel 12 through the connecting channel 21, and the first oil circuit chamber 14, the oil supply channel 11, the second oil circuit chamber 15, the working oil channel 12 and the connecting channel 21 form an H-shaped flow channel. The first pilot solenoid valve 6 is powered off, the first pilot oil supply port 61 is closed, the first pilot oil return port 62 is opened, the working oil channel 12 continuously supplies pressure to the valve position holding chamber 47 through the valve position holding oil circuit 48, and the valve body 1 continues to compress the return spring 7, so that the return spring 7 remains compressed, thereby keeping the valve stem in the working position. The second pilot solenoid valve 5 is powered on, the second pilot oil supply port 51 is opened, the second pilot oil return port 52 is closed, and the oil in the oil supply channel 11 enters the second working chamber 113 through the second pilot oil supply oil circuit 110 and the second pilot oil supply port 51, exerting a thrust on the valve stem 2. Under the action of the rebound force of the return spring 7 and the pressure of the first working chamber 112, the valve stem 2 moves to the right, and the oil in the first working chamber 112 flows to the return oil channel 13 through the first pilot oil return port 62 and the first pilot oil return oil circuit 19. The main valve 10 is in the oil return state, the second oil path cavity 15 is connected to the working oil channel 12 through the third channel 24, the side hole 25 connected to the third channel 24 and the oil return channel 13 are connected through the valve body installation cavity 16, the outlet of the oil supply channel 11 is against the surface of the valve stem 2 and is closed by the surface of the valve stem 2. At this time, there is no oil pressure in the working oil channel 12, so the valve position holding cavity 47 cannot apply thrust to the valve body 1. When the second pilot solenoid valve 5 is powered off, the second pilot oil supply port 51 is closed, the second pilot oil return port 52 is opened, and the valve body 1 maintains the oil return state under the elastic force of the return spring 7.

[0034] The above-described embodiments are only preferred embodiments for fully illustrating the present utility model, and the protection scope of the present utility model is not limited thereto. Equivalent substitutions or changes made by technicians in the technical field on the basis of the present utility model are all within the protection scope of the present utility model. The protection scope of the present utility model shall be subject to the claims.

Claims

1. A wear-resistant reversing valve, characterized in that: The invention comprises a main valve (10), wherein the main valve (10) comprises a valve body (1), wherein a valve body installation cavity (16) is arranged in the valve body (1), wherein a valve stem (2) is slidably arranged in the valve body installation cavity (16), wherein a metal wear-resistant ring is installed on the inner wall of the valve body installation cavity (16), wherein the metal wear-resistant ring is sleeved around the valve stem (2), and wherein the valve stem (2) is slidably installed in the metal wear-resistant ring.

2. The reversing valve according to claim 1, characterized in that: The left and right ends of the valve stem (2) are respectively the second end and the first end. The valve stem (2) comprises a valve stem body, a first piston (4) located at the first end, and a second piston (3) located at the second end. Two metal wear-resistant rings are installed in the valve body installation cavity (16), namely a first metal wear-resistant ring (71) and a second metal wear-resistant ring (72). The first piston (4) is slidably arranged in the first metal wear-resistant ring (71), and the second piston (3) is slidably arranged in the second metal wear-resistant ring (72).

3. The reversing valve according to claim 2, characterized in that: The inner wall of the first metal wear-resistant ring (71) and the outer wall of the first piston (4) are sealed via a fourth sealing ring (46), and the inner wall of the second metal wear-resistant ring (72) and the outer wall of the second piston (3) are sealed via a fifth sealing ring (31).

4. The reversing valve according to claim 3, characterized in that: The first metal wear-resistant ring (71) is sealed against the inner wall of the valve body installation cavity (16) by at least one sixth sealing ring (711), and the second metal wear-resistant ring (72) is sealed against the inner wall of the valve body installation cavity (16) by at least one seventh sealing ring (721).

5. The reversing valve according to claim 2, characterized in that: A return spring (7) is provided at the left end of the second piston (3). When the second piston (3) slides to the left, the return spring (7) is compressed. A second sleeve is provided on the outer sleeve of the return spring (7). The second sleeve is located on the left side of the second metal wear-resistant ring (72). The second sleeve is fixedly installed in the valve body installation cavity (16). The right end surface of the second sleeve can contact the second sleeve to prevent the second piston (3) from sliding further to the left.

6. The reversing valve according to claim 5, characterized in that: The right end of the first piston (4) is provided with a first shaft sleeve (41), the first shaft sleeve (41) is located on the right side of the first metal wear-resistant ring (71), the first shaft sleeve (41) is fixedly installed in the valve body installation cavity (16), and the outer wall of the first piston (4) and the inner wall of the first shaft sleeve (41) are sealed by a third sealing ring (44).

7. The reversing valve according to claim 6, characterized in that: The valve body (1) is also provided with an oil supply channel (11), a working oil channel (12) and an oil return channel (13) which are in communication with the valve body mounting cavity (16). When the valve stem (2) reciprocates in the valve body mounting cavity (16), the main valve (10) switches between a working state and an oil return state. When the main valve (10) is in the working state, the second piston (3) slides to the leftmost end and the return spring (7) is compressed.

8. The reversing valve according to claim 7, characterized in that: The first piston (4) is provided with a circle of first steps (45) along the circumferential direction. The first step (45) is located on the left side of the first sleeve (41). The side wall of the first step (45) and the first metal wear-resistant ring (71) are sealed by a fourth sealing ring (46). A valve position holding cavity (47) is formed between the first step (45), the first sleeve (41), the first metal wear-resistant ring (71) and the first piston (4). A valve position holding oil circuit (48) is also provided in the valve body (1). One end of the valve position holding oil circuit (48) is connected to the valve position holding cavity (47), and the other end is connected to the working oil channel (12).

9. The reversing valve according to claim 8, characterized in that: The right end of the first piston (4) forms a first working chamber, and the left end of the second piston (3) forms a second working chamber.

10. The reversing valve according to claim 9, characterized in that: The reversing valve further comprises a first pilot solenoid valve (6) and a second pilot solenoid valve (5), wherein the first pilot solenoid valve (6) is provided with a first pilot oil supply port (61), and the valve body (1) is provided with a first pilot oil supply passage (18), one end of the first pilot oil supply port (61) is connected to one end of the first pilot oil supply passage (18), the other end of the first pilot oil supply port (61) is connected to the first working chamber, and the other end of the first pilot oil supply passage (18) is connected to the oil supply passage (11), and the first pilot solenoid valve (6) can control the on and off of the first pilot oil supply port (61). The second pilot solenoid valve (5) is provided with a second pilot oil supply port (51), and the valve body (1) is provided with a second pilot oil supply passage (110). One end of the second pilot oil supply port (51) is connected to one end of the second pilot oil supply passage (110), and the other end of the second pilot oil supply port (51) is connected to the second working chamber. The other end of the second pilot oil supply passage (110) is connected to the oil supply passage (11). The second pilot solenoid valve (5) can control the on and off of the second pilot oil supply port (51). The first pilot solenoid valve (6) is provided with a first pilot oil return port (62), the valve body (1) is provided with a first pilot oil return oil circuit (19), one end of the first pilot oil return port (62) is connected to one end of the first pilot oil return oil circuit (19), the other end of the first pilot oil return port (62) is connected to the first working chamber, the other end of the first pilot oil return oil circuit (19) is connected to the oil return channel (13), and the first pilot solenoid valve (6) can control the on and off of the first pilot oil return port (62); The second pilot solenoid valve (5) is provided with a second pilot oil return port (52), and the valve body (1) is provided with a second pilot oil return oil circuit (111). One end of the second pilot oil return port (52) is connected to one end of the second pilot oil return oil circuit (111), and the other end of the second pilot oil return port (52) is connected to the second working chamber. The other end of the second pilot oil return oil circuit (111) is connected to the oil return channel. The second pilot solenoid valve (5) can control the on and off of the second pilot oil return port (52).

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