A manual proportional reversing valve

Abstract

The present application relates to a manual proportional reversing valve, which belongs to the technical field of hydraulic valves. The manual proportional reversing valve includes a main housing, an operating housing and a base, wherein a main valve core is slidably arranged in the main housing, and a reversing handle is rotatably arranged in the operating housing, and the main housing is connected to the operating housing and the base, and also includes a transmission mechanism; the transmission mechanism includes an operating shaft and a driving member, one end of the operating shaft is connected to the main hole of the valve body, and the other end passes through the outside of the main housing and is fixedly connected to the reversing handle, and a fixing hole is provided in the part of the operating shaft in the main hole of the valve body, and the driving member includes a fixing part and a driving part inserted into the fixing hole, and one end of the main valve core has a placement groove for arranging the driving part, and the driving part has a driving arc surface abutting against the side wall of the placement groove. The present application has the effect of facilitating manual reversing, manual flow adjustment and flow balance of the hydraulic reversing valve.

Description

Technical Field

[0001] The present application relates to the technical field of hydraulic control valves, and in particular to a manual proportional reversing valve. Background Art

[0002] A hydraulic reversing valve is a directional control valve that uses controlled liquid pressure to push the valve core to change the direction of fluid flow. According to the number of passages controlled by the reversing valve, it can be divided into two-way, three-way, four-way and five-way types.

[0003] The hydraulic reversing valve connects or disconnects the oil circuit or changes the direction of the oil flow through the relative movement of the valve core in the valve body, thereby controlling the start, stop or change of the movement direction of the hydraulic actuator and its drive mechanism. There are generally three types of reversing of hydraulic reversing valves: hydraulic control reversing, electric control reversing, and manual reversing. Hydraulic valves using manual reversing generally use ball heads and pin shafts. The reliability of pin shafts when used in important parts is not high. They may become loose or fail due to improper installation or long-term use, thus affecting the accuracy and stability of the manual proportional reversing valve.

[0004] In response to the above-mentioned related technologies, the present application provides another structure of a manual proportional reversing valve capable of manually switching the hydraulic oil circuit. Summary of the invention

[0005] In order to facilitate manual reversing and manual flow adjustment of a hydraulic reversing valve, the present application provides a manual proportional reversing valve.

[0006] The manual proportional reversing valve provided in this application adopts the following technical solution:

[0007] A manual proportional reversing valve comprises a main housing, a reversing handle rotatably arranged in the main housing, a main valve core slidably arranged in the main housing, and a base connected to the main housing, and also comprises a transmission mechanism for transmission connection between the reversing handle and the main valve core, wherein the main housing is provided with a valve body main hole, an oil inlet, a first working oil port and a second working oil port, wherein the oil inlet, the first working oil port and the second working oil port are all connected to the valve body main hole, the valve core is slidably arranged in the valve body main hole, and the valve core is driven to move axially along the main hole of the main valve body through the transmission mechanism; the transmission mechanism comprises an operating shaft and a driving member, wherein one end of the operating shaft is connected to the valve body main hole, and the other end passes through the outside of the main housing and is fixedly connected to the reversing handle, a fixing hole is opened in the part of the operating shaft in the valve body main hole, the driving member comprises a fixing part and a driving part inserted into the fixing hole, one end of the main valve core is provided with a placement groove for arranging the driving part, and the driving part has a driving arc surface abutting against the side wall of the placement groove.

[0008] By adopting the above technical scheme, when the direction of the oil circuit needs to be adjusted when using the above-mentioned reversing valve, the reversing handle is rotated, and the reversing handle drives the operating shaft and the driving member to rotate. The rotation of the driving member drives the main valve core to move axially along the main hole of the valve body. The back and forth movement of the main valve core can realize the connection between the oil inlet and the first working oil port or the connection between the oil inlet and the second working oil port, that is, change the direction of the oil circuit. Compared with the ball head pin shaft matching method in the prior art, the above-mentioned transmission mechanism is reliable and easy to operate.

[0009] Optionally, the main valve core includes a first valve core section connected to the driving member, a second valve core section for adjusting the reversing direction, and a third valve core section inserted into the base, and a connecting section is arranged between adjacent valve core sections, and the connecting section corresponds to the first working oil port and the second working oil port respectively.

[0010] By adopting the above technical scheme, the structural composition of the main valve core is disclosed, the first valve core section is used to cooperate with the driving member to connect to realize the back and forth movement of the main valve core as a whole, the third valve core section is inserted into the base, and is used to stabilize the main valve core as a whole, the second valve core section corresponds to the oil inlet, and both ends are connected to the first and third valve core sections through the connecting section. When the main valve core moves axially, the connecting section moves to the oil inlet, thereby realizing the connection between the oil inlet and the two working oil ports.

[0011] Optionally, both ends of the second valve core section are evenly provided with multiple adjustment grooves along the circumference of the axis. When the valve core moves axially along the main hole of the valve body and the adjustment grooves correspond to the oil inlet, the adjustment grooves and the inner walls of the oil inlet form an adjustment channel for the oil supply to flow to the working oil port.

[0012] By adopting the above technical solution and setting the adjusting groove, the flow of the hydraulic oil circuit can be adjusted. When the main valve core moves axially and the adjusting groove moves to the oil inlet, the axial distance of the adjusting channel gradually increases or decreases by continuing to move the main valve core, thereby achieving an increase or decrease in the flow.

[0013] Optionally, a connecting rod fixedly connected to the third valve core segment, a spring seat for positioning the connecting rod, and a first return spring sleeved on the connecting rod are provided in the base, and two ends of the first return spring abut against the spring seat.

[0014] By adopting the above technical scheme, the connection between the third valve core section and the base is disclosed, the third valve core section is connected to the base through a connecting rod, and the two ends of the connecting rod are positioned by spring seats. Through the setting of the first return spring, it can play a buffering role on the movement of the main valve core. When the rotation of the reversing handle is released, the first return spring can drive the main valve core to return to the initial state of oil inlet blockage.

[0015] Optionally, a second shell is provided outside the main shell and a balancing valve core is slidably provided inside the second shell, the second shell has a first balancing oil port and a second balancing oil port respectively connected to the first working oil port and the second working oil port, and the second shell is provided with an adjusting rotary cover for driving the balancing valve core to slide.

[0016] By adopting the above technical solution, the setting of the second housing and the balancing valve core can balance the hydraulic oil flowing out of the main housing, reduce the system pressure caused by excessively high or low pressure in the valve body, and improve the stability and reliability of the system operation.

[0017] Optionally, the adjusting screw cover is coaxially arranged with the balancing valve core, and the second shell has an adjusting screw hole for threaded installation of the adjusting screw cover and a second reset spring, and both ends of the second spring are respectively fixed to the adjusting screw cover and the balancing valve core.

[0018] By adopting the above technical scheme, the rotation cooperation of the adjusting rotary cover is disclosed. When the balancing valve core needs to be adjusted, the second return spring is compressed by rotating the adjusting rotary cover. Since the balancing valve core is slidingly arranged in the second housing, the deformation force of the second return spring to restore the elastic deformation drives the balancing valve core to move, thereby realizing the volume size of the two balancing oil ports and achieving balanced adjustment.

[0019] Optionally, a buffer oil port is further provided in the second housing between the first balance oil port and the second balance oil port, and an end of the buffer oil port is connected to the first balance oil port.

[0020] By adopting the above technical solution, the setting of the buffer oil port can store the return oil of the first balance oil port, thereby further adjusting the system pressure.

[0021] Optionally, a one-way cone valve body is provided at the connecting port of the first balancing oil port with the buffer oil port, and the one-way cone valve body includes a cone valve body for blocking the first balancing oil port, a cone valve seat for installing the cone valve body, and a cone valve spring sleeved on the cone valve body.

[0022] By adopting the above technical solution and setting the one-way cone valve body, it is possible to limit the reverse flow of hydraulic oil into the first balancing oil port, reduce unnecessary pressure fluctuations and impacts in the housing, and improve the overall performance of the system.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. The hydraulic reversing valve of the present application rotates the reversing handle through the setting of the rotating mechanism, and the reversing handle drives the operating shaft and the driving member to rotate. The rotation of the driving member drives the main valve core to move axially along the main hole of the valve body. The back and forth movement of the main valve core can realize the communication between the oil inlet and the first working oil port or the communication between the oil inlet and the second working oil port, that is, the direction of the oil circuit is changed, and the operation is simple;

[0025] 2. The present application can adjust the flow of the hydraulic oil circuit by setting the adjusting groove. When the main valve core moves axially and the adjusting groove moves to the oil inlet, the main valve core is continued to move so that the axial distance of the adjusting channel gradually increases or decreases, thereby increasing or decreasing the flow;

[0026] 3. The present application can balance the hydraulic oil flowing out of the main housing through the setting of the second housing and the balancing valve core in the second housing, reduce the system caused by excessively high or low pressure in the valve body, and improve the stability and reliability of the system operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0028] Figure 2 It is an overall cross-sectional schematic diagram of an embodiment of the present application.

[0029] Figure 3 It is a schematic structural diagram of the rotating mechanism of an embodiment of the present application.

[0030] Figure 4 It is a schematic diagram of the structure of the limit assembly of an embodiment of the present application.

[0031] Figure 5 It is a cross-sectional schematic diagram of the main shell of an embodiment of the present application.

[0032] Figure 6 It is a schematic diagram of the structure of the main valve core of an embodiment of the present application.

[0033] Figure 7 It is a schematic cross-sectional view of the second shell of the embodiment of the present application.

[0034] Figure 8 It is a schematic diagram of the structure of the balancing valve core of an embodiment of the present application.

[0035] Explanation of the reference numerals: 1. Main housing; 11. Main hole of valve body; 12. Oil inlet; 121. Adjustment channel; 13. First working oil port; 14. Second working oil port; 2. Operating housing; 21. Reversing handle; 22. Transmission mechanism; 221. Operating shaft; 2211. Fixing hole; 222. Driving member; 2221. Fixing part; 2222. Driving part; 2223. Driving arc surface; 23. Limiting assembly; 231. Fixing plate; 232. Limiting plate; 233. Limiting groove; 3. Base; 31. Connecting rod; 32. Spring seat; 33. First return spring; 4. Second housing; 41. First balancing oil port ;42. Second balancing oil port;43. Adjusting screw cap;431. Spring slot;44. Balancing shaft hole;441. Adjusting screw hole;45. Second return spring;46. Buffer oil port;461. Buffer oil channel;47. One-way cone valve body;471. Cone valve body;472. Cone valve seat;473. Cone valve spring;5. Main valve core;51. First valve core section;52. Second valve core section;521. Adjusting slot;53. Third valve core section;54. Connecting section;55. Placement slot;6. Balancing valve core;61. First balancing section;62. Second balancing section;63. Third balancing section;631. Balance adjustment slot;7. One-way throttle valve. DETAILED DESCRIPTION

[0036] The following is combined with Figure 1-8 This application is described in further detail.

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Since the embodiments disclosed in the present invention can be set in different directions, these terms indicating directions are only for illustration and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features.

[0038] The embodiment of the present application discloses a manual proportional reversing valve.

[0039] Reference Figure 1 and Figure 2A manual proportional reversing valve comprises a main housing 1, an operating housing 2, a base 3 and a second housing 4. The operating housing 2 and the base 3 are respectively arranged on both sides of the main housing 1, and the second housing 4 is arranged on the side wall of the main housing 1. A main valve core 5 is slidably installed in the main housing 1, and a balancing valve core 6 is slidably installed in the second housing 4.

[0040] The main housing 1 has a main hole 11 for arranging the main valve core 5 along the length direction, and the two ends of the main hole 11 are respectively connected to the operating housing 2 and the base 3. The main valve core 5 is arranged in the main hole 11 of the valve body, and both ends pass through the main hole 11 of the valve body to the operating housing 2 and the base 3. The main valve core 5 and the two openings of the main hole 11 of the valve body are sealed and slidably connected. The axial direction of the main valve core 5 is defined as the X direction, the width direction of the main housing is defined as the Y direction, and the length direction of the main housing 1 and the second housing 4 after combination is defined as the Z direction.

[0041] A reversing handle 21 and a transmission mechanism 22 which is connected between the reversing handle 21 and the main valve core 5 are rotatably provided on the operating housing 2 .

[0042] Reference Figure 2 and Figure 3 The transmission mechanism 22 includes an operating shaft 221 fixedly connected to the reversing handle 21 and a driving member 222 fixed to the operating shaft 221. The operating shaft 221 and the fixed housing are rotatably matched through a shaft sleeve. One end of the operating shaft 221 passes through the inner cavity of the operating housing 2 and is fixed to the reversing handle 21. The axial direction of the operating shaft 221 is perpendicular to the axis of the main valve core 5, and the other end of the operating shaft 221 located in the operating housing 2 has a fixing hole 2211 corresponding to the axis of the main valve core 5. The fixing hole 2211 passes through the opposite side walls of the operating shaft 221.

[0043] The driving member 222 includes a fixing portion 2221 and a driving portion 2222, and the fixing portion 2221 and the driving portion 2222 are integrally formed. The fixing portion 2221 is fixedly inserted in the fixing hole 2211. The main valve core 5 has a placement groove 55 corresponding to the fixing hole 2211 and for arranging the driving portion 2222, and the placement groove 55 is a rectangular groove with a rectangular cross section. The driving portion 2222 is cylindrical as a whole, and its outer side wall has a driving arc surface 2223 for abutting against the inner wall of the placement groove.

[0044] A limit assembly 23 for limiting the rotation of the reversing handle 21 is also fixedly installed outside the operating housing 2. The limit assembly 23 includes a fixed sheet 231 fixed to the main housing 1 by bolts and two limit sheets 232 rotatably installed on the fixed sheet 231. The fixed sheet 231 is a sheet with a U-shaped cross section. The limit sheet 232 is rotatably connected to the limit sheet 232 through a rotating shaft, and the rotation direction of the limit sheet 232 is perpendicular to the rotation direction of the reversing handle 21. A limit groove 233 adapted to the reversing handle 21 is provided between the two limit sheets 232. When the hydraulic reversing valve stops working, the limit sheet 232 is rotated to both sides of the reversing handle 21 to limit the rotation of the reversing handle 21.

[0045] Figure 4 and Figure 5 The main housing 1 has an oil inlet 12 connected to the main hole 11 of the valve body, a first working oil port 13 and a second working oil port 14. The oil inlet 12 is connected to the external hydraulic system and is located between the two working oil ports. The main valve core 5 includes a first valve core section 51, a second valve core section 52 and a third valve core section 53 in the direction from the operating housing 2 to the base 3. The outer diameters of the three valve core sections are the same and fit closely with the inner wall of the main hole 11 of the valve body. Two adjacent valve core sections are connected by a connecting section 54. The connecting section 54 is arranged corresponding to the two working oil ports, and the outer diameter of the connecting section 54 is smaller than the outer diameter of the valve core section.

[0046] The first valve core section 51 is used to limit the driving part 2222, the second valve core section 52 corresponds to the oil inlet 12, and the third valve core section 53 is inserted into the base 3. A connecting rod 31 is slidably installed in the base 3, and the connecting rod 31 is coaxially arranged with the main valve core 5 and is plugged and fixed with the third valve core section 53. Two spring seats 32 for positioning the connecting rod 31 are provided in the base 3, and the spring seats 32 have a through hole for the connecting rod 31 to slide through. Among them, a first reset spring 33 is also sleeved between the two spring seats 32 to realize the reset of the main valve core 5 after movement.

[0047] When the first return spring 33 is in a normal state, the second valve core section 52 corresponds to the oil inlet 12, closing the oil inlet 12 and the two working oil ports; when the reversing handle 21 rotates clockwise along the operating shaft 221, the driving part 2222 is driven to move to the right side in the figure, and when the connecting section 54 on the left side corresponds to the oil inlet 12, the oil inlet 12 and the second working oil port 14 are connected; when the reversing arm rotates counterclockwise along the operating shaft 221, the driving part 2222 is driven to move to the left side in the figure, and when the connecting section 54 on the right side corresponds to the oil inlet 12, the oil inlet 12 and the first working oil port 13 are connected.

[0048] Among them, multiple adjustment grooves 521 are opened at both ends of the second valve core section 52. The side wall of the oil inlet 12 of the adjustment groove 521 forms an adjustment oil channel. The adjustment groove 521 is a U-shaped groove as a whole. In this embodiment, the end of the second valve core section 52 has four adjustment grooves 521, and the four adjustment grooves 521 are evenly arranged at intervals along the circumferential direction of the axis of the main valve core 5. When the main valve core 5 moves axially along the main hole 11 of the valve body, and when the adjustment groove 521 and the oil inlet 12 correspond, the adjustment groove 521 and the inner wall of the oil inlet 12 form an adjustment channel 121 for the oil supply path to flow to the corresponding working oil port.

[0049] Reference Figure 2 and Figure 7 The second housing 4 is fixed to one side of the main housing 1 by bolts. The second housing 4 has a first balancing oil port 41 connected to the first working oil port 13, a second balancing oil port 42 connected to the second working oil port 14, and an adjusting screw cap 43. The second housing 4 has a balancing shaft hole 44 for axial sliding arrangement of the balancing valve core 6. The balancing shaft hole 44 and the valve body shaft hole are arranged in parallel. Both ends of the balancing shaft hole 44 are connected to the side wall of the second housing 4 and the outside world. A one-way throttle valve 7 is installed at one end, and an adjusting screw hole 441 is arranged on the inner wall of the other end.

[0050] The adjusting screw cap 43 is threadedly installed in the adjusting screw hole 441. The adjusting screw cap 43 has a spring groove 431 on one end surface in the balancing shaft hole 44, and the balancing valve core 6 has a spring groove 431 corresponding to the accommodating groove at one end facing the adjusting screw cap 43. A second return spring 45 is fixedly installed in the two spring grooves 431, and both ends of the second return spring 45 are fixedly connected to the adjusting screw cap 43 and the balancing valve core 6.

[0051] Combination Figure 8 The structure of the balancing valve core 6 is similar to that of the main valve core 5, and includes a first balancing section 61, a second balancing section 62, and a third balancing section 63 in sequence from the regulating rotary cover 43 to the one-way throttle valve 7 to the regulating rotary cover 43. Among them, the first balancing section 61 is sealed and fitted with the balancing shaft hole 44 in a normal state, and the third balancing core section is arranged at the first balancing oil port 41 accordingly.

[0052] The second housing 4 is also provided with a buffer oil port 46 between the two balancing oil ports. The bottom of the buffer oil port 46 has a buffer oil passage 461 connected to the first balancing oil port 41. The third balancing section 63 is provided with a balancing adjustment groove 631 at one end facing the buffer oil port 46. In this embodiment, the third balancing core section has two balancing adjustment grooves 631 arranged symmetrically along the axis, and the balancing adjustment grooves 631 are U-shaped grooves.

[0053] When the balancing valve core 6 is in a normal state, the first working oil port 13 is connected to the first balancing oil port 41, the second working oil port 14 is connected to the second balancing oil port 42, and the buffer oil port 46 and the first working oil port 13 are in a sealed state at the balancing shaft hole 44; when the adjusting cover 43 is rotated clockwise to move the adjusting cover 43 to the left, the second return spring 45 is first driven to be compressed, and then the second return spring 45 drives the balancing valve core 6 to move to the left as a whole under the action of restoring deformation. At this time, the volume of the area corresponding to the buffer oil port 46 and the balancing shaft hole 44 increases; when the adjusting cover 43 is rotated counterclockwise to move the adjusting cover 43 to the right, the second return spring 45 is first driven to be stretched, and then the second return spring 45 drives the balancing valve core 6 to move to the right as a whole under the action of restoring deformation until the buffer oil port 46 is connected to the first balancing oil port 41.

[0054] In order to prevent the hydraulic oil in the buffer oil passage 461 from flowing back to the first balance oil port 41, the second housing 4 is provided with a one-way cone valve body 47 in the buffer oil passage 461. The one-way cone valve body 47 includes a cone valve body 471 coaxially corresponding to the first balance oil port 41, a cone valve seat 472 for slidingly mounting the cone valve body 471, and a cone valve spring 473 sleeved on the outside of the cone valve body 471.

[0055] The implementation principle of a manual proportional reversing valve in the embodiment of the present application is:

[0056] When the direction of the hydraulic valve oil circuit is switched or the oil circuit flow rate is adjusted by the reversing handle 21:

[0057] When the first return spring 33 is in a normal state, the second valve core section 52 corresponds to the oil inlet 12, closing the oil inlet 12 and the two working oil ports; when the reversing handle 21 rotates clockwise along the operating shaft 221, the driving part 2222 is driven to move to the right side in the figure, and when the connecting section 54 on the left side corresponds to the oil inlet 12, the oil inlet 12 and the second working oil port 14 are connected; when the reversing arm rotates counterclockwise along the operating shaft 221, the driving part 2222 is driven to move to the left side in the figure, and when the connecting section 54 on the right side corresponds to the oil inlet 12, the oil inlet 12 and the first working oil port 13 are connected;

[0058] The balancing valve core 6 is moved axially by rotating the adjusting cover 43, so that the flow rate of the balancing oil port can be adjusted:

[0059] When the balancing valve core 6 is in a normal state, the first working oil port 13 is connected to the first balancing oil port 41, the second working oil port 14 is connected to the second balancing oil port 42, and the buffer oil port 46 and the first working oil port 13 are in a sealed state at the balancing shaft hole 44; when the adjusting cover 43 is rotated clockwise to move the adjusting cover 43 to the left, the second return spring 45 is first driven to be compressed, and then the second return spring 45 drives the balancing valve core 6 to move to the left as a whole under the action of restoring deformation. At this time, the volume of the area corresponding to the buffer oil port 46 and the balancing shaft hole 44 increases; when the adjusting cover 43 is rotated counterclockwise to move the adjusting cover 43 to the right, the second return spring 45 is first driven to be stretched, and then the second return spring 45 drives the balancing valve core 6 to move to the right as a whole under the action of restoring deformation until the buffer oil port 46 is connected to the first balancing oil port 41.

[0060] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A manual proportional reversing valve, comprising a main housing (1), an operating housing (2) and a base (3), wherein a main valve core (5) is slidably disposed in the main housing (1), a reversing handle (21) is rotatably disposed in the operating housing (2), and the main housing (1) is connected to the operating housing (2) and the base (3), characterized in that: It also includes a transmission mechanism (22) for transmission connection between the reversing handle (21) and the main valve core (5); the main housing (1) has a valve body main hole (11), an oil inlet (12), a first working oil port (13) and a second working oil port (14); the oil inlet (12), the first working oil port (13) and the second working oil port (14) are all connected to the valve body main hole (11); the main valve core (5) is slidably arranged in the valve body main hole (11), and is driven by the transmission mechanism (22) to move axially along the valve body main hole (11); The transmission mechanism (22) comprises an operating shaft (221) and a driving member (222); one end of the operating shaft (221) is connected to the main hole (11) of the valve body, and the other end passes through the outside of the main housing (1) and is fixedly connected to the reversing handle (21); a fixing hole (2211) is provided in the portion of the operating shaft (221) inside the main hole (11) of the valve body; the driving member (222) comprises a fixing portion (2221) inserted into the fixing hole (2211) and a driving portion (2222); one end of the main valve core (5) comprises a placement groove for arranging the driving portion (2222); the driving portion (2222) comprises a driving arc surface (2223) abutting against a side wall of the placement groove; The main housing (1) is connected to a second housing (4) outside and a balancing valve core (6) is slidably arranged in the second housing (4); the second housing (4) has a first balancing oil port (41) and a second balancing oil port (42) respectively connected to the first working oil port (13) and the second working oil port (14); the second housing (4) is provided with an adjusting rotary cover (43) for driving the balancing valve core (6) to slide; the second housing (4) has a first balancing oil port (41) and a second balancing oil port (42) connected to the first working oil port (13) and the second working oil port (14) respectively; 2) and a buffer oil port (46) is provided between the first and second balancing oil ports (41); an end of the buffer oil port (46) is connected to the first balancing oil port (41); a one-way cone valve body (47) is provided at the connection port between the first balancing oil port (41) and the buffer oil port (46); the one-way cone valve body (47) comprises a cone valve body (471) for blocking the first balancing oil port (41), a cone valve seat (472) for mounting the cone valve body (471), and a cone valve spring (473) sleeved on the cone valve body (471).

2. A manual proportional reversing valve according to claim 1, characterized in that: The main valve core (5) comprises a first valve core section (51) connected to the driving member (222), a second valve core section (52) for adjusting the switching direction, and a third valve core section (53) inserted into the base (3), and a connecting section (54) is provided between adjacent valve core sections, and the connecting section (54) corresponds to the first working oil port (13) and the second working oil port (14), respectively.

3. A manual proportional reversing valve according to claim 2, characterized in that: Both ends of the second valve core section (52) are evenly provided with a plurality of adjustment grooves (521) along the circumferential direction of the axis. When the main valve core (5) moves axially along the main hole (11) of the valve body and the adjustment grooves (521) correspond to the oil inlet (12), the adjustment grooves (521) and the inner wall of the oil inlet (12) form an adjustment channel (121) for the oil supply path to flow to the working oil port.

4. A manual proportional reversing valve according to claim 2, characterized in that: The base (3) is provided with a connecting rod (31) fixedly connected to the third valve core section (53), a spring seat (32) for positioning the connecting rod (31), and a first return spring (33) sleeved on the connecting rod (31), with both ends of the first return spring (33) abutting against the spring seat (32).

5. A manual proportional reversing valve according to claim 1, characterized in that: The regulating rotary cover (43) is coaxially arranged with the balancing valve core (6), and the second housing (4) has an regulating screw hole (441) for threaded installation of the regulating rotary cover (43) and a second return spring (45), and two ends of the second return spring (45) are respectively fixed to the regulating rotary cover (43) and the balancing valve core (6).

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