two-position two-way proportional valve

Abstract

The application discloses a two-position two-way proportional valve, which comprises a valve body, a main valve core and a mechanical pilot valve assembly, the main valve core is arranged in a cavity of the valve body and is provided with a valve core push block, the cavity comprises a first control cavity and a second control cavity located on both sides of the valve core push block, the pilot valve comprises a pilot valve body, a first valve core and a second valve core, the pilot valve body is provided with a first oil discharge channel and a second oil discharge channel which are communicated with the first control cavity and the second control cavity respectively, the first valve core can control the on-off of the first oil discharge channel, the second valve core can control the on-off of the second oil discharge channel, and the driving assembly comprises a driving piece, a first driving rod and a second driving rod, the first driving rod is arranged between the first valve core and the second valve core, the second driving rod is rotationally connected with the first driving rod, one end of the second driving rod is rotationally connected with the driving piece, and the other end of the second driving rod is rotationally connected with the main valve core. The two-position two-way proportional valve adopts a mechanical lever feedback form, has high control precision and low cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valve control, in particular to a two-position two-way proportional valve. BACKGROUND

[0002] The coal mining face is formed by sequentially arranging multiple hydraulic supports on the working face, and each hydraulic support is connected with a chute by a pushing jack. In addition to supporting the roof of the working face, the hydraulic supports also realize the functions of moving and pushing the chute. In order to realize the normal operation of the working face, the straightness between multiple hydraulic supports needs to be maintained to a certain extent. During the coal mining process, the chute is the track for the operation of the coal mining machine, and the chute needs to maintain a certain degree of straightness to achieve good coal cutting effect of the coal mining machine and realize the flatness of the working face.

[0003] At present, most of the pushing hydraulic cylinders are realized by using on-off valves or multi-stage speed regulating valves based on time control to realize position control. Since the existing hydraulic systems of the supports are composed of on-off valves, the stepless proportional control of the opening degree of the main valve core cannot be realized, and the control precision still has a large space for improvement. The use of proportional electromagnetic valves for control needs to be equipped with displacement sensors, pressure sensors and other elements, which has high cost and low control precision. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a two-position two-way proportional valve, which adopts a mechanical lever type feedback form, does not need to be equipped with a displacement sensor or a pressure sensor, and can realize the opening and closing control of the pilot valve, so as to realize the position control of the main valve core. The control principle is simple, the control precision is high, the cost is relatively low, and the stepless control of the opening degree position of the main valve core can be realized.

[0005] The two-position two-way proportional valve of the embodiment of the present application comprises a valve body and a main valve core, the main valve core is arranged in the valve body and has a valve core push block, the valve body has a first control cavity and a second control cavity, the valve body has an oil inlet, the first control cavity and the second control cavity are in communication with the oil inlet, and the first control cavity and the second control cavity are respectively located on two sides of the valve core push block; a mechanical pilot valve assembly is connected to the valve body, and the mechanical pilot valve assembly comprises a pilot valve and a driving assembly, the pilot valve comprises a pilot valve body, a first valve core and a second valve core, the pilot valve body has a first oil discharge channel and a second oil discharge channel, the first valve core can control the opening and closing of the first oil discharge channel, the second valve core can control the opening and closing of the second oil discharge channel, the first oil discharge channel is in communication with the first control cavity, the second oil discharge channel is in communication with the second control cavity, the axes of the first valve core and the second valve core are collinear, and the axes of the first valve core and the second valve core are parallel to the axis of the main valve core; the driving assembly comprises a driving member, a first driving rod and a second driving rod, the first driving rod is transversely arranged between the first valve core and the second valve core, the second driving rod is rotationally connected with the first driving rod, one end of the second driving rod is rotationally connected with the driving member, and the other end is rotationally connected with the main valve core, movement of the first driving rod towards the first valve core can push the first valve core to connect the first oil discharge channel, and movement of the first driving rod towards the second valve core can push the second valve core to connect the second oil discharge channel.

[0006] The two-position two-way proportional valve of the embodiment of the present application has a valve body with a first control cavity and a second control cavity in communication with an oil inlet, a pilot valve including a first valve core, a second valve core, a first oil discharge channel in communication with the first valve core, and a second oil discharge channel in communication with the second valve core, the first valve core being capable of controlling the opening and closing of the first oil discharge channel, the second valve core being capable of controlling the opening and closing of the second oil discharge channel, a mechanical pilot valve assembly including a driving member, a first driving rod, and a second driving rod, the first driving rod being transversely arranged between the first valve core and the second valve core, one end of the second driving rod being rotatably connected with the driving member, the other end being rotatably connected with the main valve core, and the first driving rod and the second driving rod being rotatably connected, whereby the driving member can drive the first driving rod to move towards the first valve core or the second valve core through the second driving rod to open one of the first oil discharge channel and the second oil discharge channel, and the hydraulic oil in the control cavity in communication with the opened oil discharge channel can be returned through the oil discharge channel, the pressure in the control cavity is reduced, the main valve core is moved to open or close the oil supply channel under the action of the pressure difference, and the main valve core can drive the first driving rod to reset through the second driving rod with the movement of the main valve core, when the first driving rod is completely reset, the first valve core and the second valve core are both closed, the first control cavity and the second control cavity are sealed, the pressure on both sides of the valve core push block is balanced, and the valve core can be kept at a fixed opening degree. Thus, the mechanical pilot valve assembly of the two-position two-way proportional valve of the present application adopts a mechanical lever feedback form, and the opening and closing control of the pilot valve can be realized without the need of setting a displacement sensor or a pressure sensor, so as to achieve the position control of the main valve core, the control principle is simple, the control precision is high, and the cost is relatively low, and the proportional control of the opening degree position of the main valve core can be realized through the proportion of the upper and lower rod sections of the second driving rod.

[0007] In some embodiments, the connection between the first driving rod and the second driving rod is located at a middle position of the first driving rod, and / or the connection between the first driving rod and the second driving rod is located at a middle position of the second driving rod.

[0008] In some embodiments, an end of the first driving rod is provided with a throttling groove.

[0009] In some embodiments, the pilot valve includes a first pilot valve and a second pilot valve, the first pilot valve having the first valve core and the first oil discharge channel, and the second pilot valve including the second valve core and the second oil discharge channel.

[0010] In some embodiments, the first pilot valve and / or the second pilot valve is a ball valve.

[0011] In some embodiments, the driving assembly includes a push rod, the push rod being arranged on the valve body along the length direction of the main valve core, one end of the push rod being connected with the main valve core, and the other end being rotatably connected with the second driving rod.

[0012] In some embodiments, the driving member is a linear actuator.

[0013] In some embodiments, the first driving rod and the second driving rod are connected through a spherical hinge structure.

[0014] In some embodiments, a one-way valve allowing oil supply towards the first control chamber is arranged between the first control chamber and the oil inlet, and / or a one-way valve allowing oil supply towards the second control chamber is arranged between the second control chamber and the oil inlet.

[0015] In some embodiments, when the first oil discharge channel and the second oil discharge channel are both closed, the length of the first driving rod is equal to the interval distance between the first spool and the second spool. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a structural schematic diagram of a two-position two-way proportional valve according to an embodiment of the present application.

[0017] Figure 2 is a structural schematic diagram of a first driving rod of a two-position two-way proportional valve according to an embodiment of the present application.

[0018] REFERENCE NUMERALS:

[0019] Valve body 1, main spool 2, spool push block 21, first pilot valve 3, first spool 4, second pilot valve 5, second spool 6, driving member 7, first driving rod 8, second driving rod 9, one-way valve 10, first control chamber 11, second control chamber 12, working port 13, damping hole 14, push rod 15. DETAILED DESCRIPTION

[0020] Embodiments of the present application are described in detail below with reference to the accompanying drawings. The embodiments described below by way of example with reference to the accompanying drawings are illustrative and are intended to explain the present application, and are not to be understood as limiting the present application.

[0021] As Figure 1 shown, the two-position two-way proportional valve according to an embodiment of the present application includes a valve body 1, a main spool 2, and a mechanical pilot valve assembly.

[0022] Specifically, as Figure 1 shown, the valve body 1 has a cavity, the main spool 2 is movably arranged in the cavity, and the main spool 2 includes a body and a spool push block 21 arranged around the outer periphery of the body and sealingly fitted with the inner wall of the cavity, the cavity includes a first control chamber 11 and a second control chamber 12 located on both sides of the spool push block 21, and the valve body 1 has an oil inlet communicating with the first control chamber 11 and the second control chamber 12.

[0023] It can be understood that when the pressures of the first control chamber 11 and the second control chamber 12 are consistent, the valve core push block 21 is balanced on both sides, and the main valve core 2 is kept at a fixed opening degree. When there is a pressure difference between the first control chamber 11 and the second control chamber 12, the valve core push block 21 will drive the main valve core 2 to move towards the low-pressure side under the action of the pressure difference, thereby realizing the control of the opening degree position of the main valve core 2.

[0024] Further, as shown in Figure 1 , the mechanical pilot valve assembly is connected to the valve body 1, and the mechanical pilot valve assembly comprises a pilot valve and a driving assembly. The pilot valve comprises a pilot valve body 1, a first valve core 4 and a second valve core 6. The pilot valve body 1 has a first oil drain passage and a second oil drain passage. The first valve core 4 can control the opening and closing of the first oil drain passage, and the second valve core 6 can control the opening and closing of the second oil drain passage. The first oil drain passage is in communication with the first control chamber 11, and the second oil drain passage is in communication with the second control chamber 12. The axes of the first valve core 4 and the second valve core 6 are collinear, and the first valve core 4 and the second valve core 6 are spaced apart. Preferably, the axes of the first valve core 4 and the second valve core 6 are parallel to the axis of the main valve core 2.

[0025] It can be understood that when the first valve core 4 controls the first oil drain passage to open, the hydraulic oil in the first control chamber 11 will return to the first oil drain passage, the pressure of the first control chamber 11 decreases, and the valve core push block 21 moves towards the side where the first control chamber 11 is located under the action of the pressure difference. When the first valve core 4 closes the first oil drain passage again, the first control chamber 11 no longer returns oil to the first oil drain passage, the first control chamber 11 is sealed again, and the pressure on both sides of the valve core push block 21 is balanced again, and the main valve core 2 is kept at a fixed opening degree.

[0026] When the second valve core 6 controls the second oil drain passage to open, the hydraulic oil in the second control chamber 12 will return to the second oil drain passage, the pressure of the second control chamber 12 decreases, and the valve core push block 21 moves towards the side where the second control chamber 12 is located under the action of the pressure difference. When the second valve core 6 closes the second oil drain passage again, the second control chamber 12 no longer returns oil to the second oil drain passage, the second control chamber 12 is sealed again, and the pressure on both sides of the valve core push block 21 is balanced again, and the main valve core 2 is kept at a fixed opening degree.

[0027] Further, the movement of the first valve core 4 and the second valve core 6 is controlled by the driving assembly. Specifically, as shown in Figure 1 , the driving assembly comprises a driving member 7, a first driving rod 8 and a second driving rod 9. The first driving rod 8 is transversely arranged between the first valve core 4 and the second valve core 6. The second driving rod 9 is rotatably connected with the first driving rod 8. One end of the second driving rod 9 is rotatably connected with the driving member 7, and the other end is rotatably connected with the main valve core 2. Moving the first driving rod 8 towards the first valve core 4 can push the first valve core 4 to connect the first oil drain passage. Moving the first driving rod 8 towards the second valve core 6 can push the second valve core 6 to connect the second oil drain passage.

[0028] Therefore, for ease of understanding, please refer to the appendix. Figure 1 It can be seen that the valve body 1 has an oil supply channel, one end of which is connected to the working port 13, and the other end is connected to the oil inlet. Figure 1 (P port in the middle), the main valve core 2 can open the oil supply channel by moving to the left. The second control chamber 12 is located to the left of the valve core push block 21, and the first control chamber 11 is located to the right of the valve core push block 21. The first valve core 4 and the second valve core 6 are located on the left and right sides of the first drive rod 8, respectively, and the second drive rod 9 is located in the middle of the two. When it is necessary to supply oil to the working face, the drive component 7 drags the second drive rod 9 to the right. Since the bottom of the second drive rod 9 is rotatably connected to the main valve core 2, the second drive rod 9 will deflect downward around its connection point with the main valve core 2. The second drive rod 9 can drive the first drive rod 8 to move to the right to drive the second valve core 6 to open the second unloading channel. Then the second control chamber 12 returns oil through the second unloading channel. The pressure in the second control chamber 12 decreases, and the valve core push block 21 drives the main valve core 2 to move to the left to open the oil supply channel.

[0029] It is understandable that, such as Figure 1 As shown, when the main valve core 2 moves to the left to open, the main valve core 2 can drag the second drive rod 9 to the left. The second drive rod 9 will then rotate upward around its connection point with the drive component 7. The second drive rod 9 will drive the first drive rod 8 to move to the left until the first drive rod 8 moves back to the initial position. At this point, the second valve core 6 will close, the second unloading channel will be disconnected, the second control chamber 12 will be sealed again, and the pressure on both sides of the valve core push block 21 will remain balanced, thereby causing the main valve core 2 to stop moving and remain at a fixed opening.

[0030] Furthermore, when it is necessary to control the main valve core 2 to close, the drive component 7 can drag the second drive rod 9 to the left, thereby driving the first drive rod 8 to move to the left. Then, the first drive rod 8 drives the first valve core 4 to open the first unloading channel. The hydraulic oil in the first control chamber 11 can return through the first unloading channel. The pressure in the first control chamber 11 decreases, and the valve core push block 21 drives the main valve core 2 to move to the right to close the oil supply channel.

[0031] Therefore, the mechanical pilot valve assembly of the two-position two-way proportional valve of this application adopts a mechanical lever feedback form, which can realize the opening and closing control of the pilot valve without the need to set a displacement sensor or pressure sensor, thereby achieving position control of the main valve core 2. The control principle is simple, the control accuracy is high, and the cost is relatively low.

[0032] Furthermore, the proportional control of the opening position of the main valve core 2 can be achieved through a mechanical lever structure, specifically, as follows: Figure 1As shown, the connection point of the first driving rod 8 and the second driving rod 9 can be used as a base point, the upper rod segment is connected with the driving member 7, and the lower rod segment is connected with the main valve core 2. By distributing the length ratio of the upper rod segment and the lower rod segment, the stepless regulation of the opening position of the main valve core 2 can be realized.

[0033] For example, when the lengths of the upper rod segment and the lower rod segment are equal, taking the process of opening the main valve core 2 as an example, the stroke of the driving member 7 dragging the second driving rod 9 to the right is s. Since the lengths of the upper rod segment and the lower rod segment are consistent, when the main valve core 2 moves a stroke s, the second driving rod 9 will return to the initial position again, the second valve core 6 is closed again, and the main valve core 2 is kept at a fixed opening. That is, at this time, the driving stroke of the driving member 7 can be controlled to realize the “1:1” proportional control of the moving stroke of the main valve core 2.

[0034] For another example, when the length ratio of the lower rod segment and the upper rod segment is 2:1, taking the stroke of the driving member 7 dragging the second driving rod 9 to the right as L, the main valve core 2 needs to move a stroke of 2L to the right, and then the second driving rod 9 can be reset. That is, at this time, the driving stroke of the driving member 7 can be controlled to realize the “1:2” proportional control of the moving stroke of the main valve core 2. It can be understood that the lengths of the upper rod segment and the lower rod segment can be any ratio, so as to realize the stepless control of the opening position of the main valve core 2.

[0035] In other words, the driving of the first driving rod 8 by the driving member 7 can control the opening of the main valve core 2, and the opening of the main valve core 2 will feed back to the first driving rod 8 and drive the first driving rod 8 to reset. The proportional control of the opening of the main valve core 2 by the mechanical pilot valve assembly can be realized by distributing the lengths of the upper rod segment and the lower rod segment. Since the lengths of the upper rod segment and the lower rod segment can be arbitrarily set, the mechanical pilot valve assembly can realize the stepless control of the opening position of the main valve core 2.

[0036] It can be understood that the first valve core 4 and the second valve core 6 are both equipped with reset springs. When the first driving rod 8 is at the initial position, the first valve core 4 and the second valve core 6 are both in the closed state under the action of the reset springs. That is, when the first driving rod 8 moves towards one of the valve cores, the other valve core will be in the closed state. The movement of the main valve core 2 will feed back to the first driving rod 8 and drive the first driving rod 8 to reset. When the main valve core 2 moves to the preset opening position, the first driving rod 8 will completely reset to the initial position, and then the first valve core 4 and the second valve core 6 are both closed, the first control cavity 11 and the second control cavity 12 are sealed, and the main valve core 2 can be kept at a fixed opening.

[0037] The two-position two-way proportional valve of the embodiment of the present application has a valve body 1 with a first control cavity 11 and a second control cavity 12 in communication with an oil inlet, a pilot valve including a first valve core 4, a second valve core 6, a first oil discharge channel in communication with the first valve core 4, and a second oil discharge channel in communication with the second valve core 6, the first valve core 4 being capable of controlling the opening and closing of the first oil discharge channel, the second valve core 6 being capable of controlling the opening and closing of the second oil discharge channel, a mechanical pilot valve assembly including a driving member 7, a first driving rod 8, and a second driving rod 9, the first driving rod 8 being transversely arranged between the first valve core 4 and the second valve core 6, one end of the second driving rod 9 being rotatably connected with the driving member 7, the other end being rotatably connected with the main valve core 2, and the first driving rod 8 and the second driving rod 9 being rotatably connected, whereby the driving member 7 can drive the first driving rod 8 to move towards the first valve core 4 or the second valve core 6 by dragging the second driving rod 9, so as to open one of the first oil discharge channel and the second oil discharge channel, and then the hydraulic oil in the control cavity in communication with the opened oil discharge channel can be returned through the oil discharge channel, the pressure in the control cavity is reduced, and the main valve core 2 is moved to open or close the oil supply channel under the action of the pressure difference, and along with the movement of the main valve core 2, the main valve core 2 can drive the first driving rod 8 to reset by dragging the second driving rod 9, and when the first driving rod 8 is completely reset, the first valve core 4 and the second valve core 6 are both closed, the first control cavity 11 and the second control cavity 12 are sealed, the pressure on both sides of the valve core push block 21 is balanced, and the valve core can be kept at a fixed opening degree.

[0038] Thus, the mechanical pilot valve assembly of the two-position two-way proportional valve of the present application adopts a mechanical lever feedback form, and the opening and closing control of the pilot valve can be realized without the need of setting a displacement sensor or a pressure sensor, so as to achieve the position control of the main valve core 2, the control principle is simple, the control precision is high, and the cost is relatively low, and the proportional control of the opening position of the main valve core 2 can be realized by setting the proportions of the upper and lower rod sections of the second driving rod 9.

[0039] Preferably, the connection position of the first driving rod 8 and the second driving rod 9 is at the middle position of the first driving rod 8, and the connection position of the first driving rod 8 and the second driving rod 9 is at the middle position of the second driving rod 9. Thus, the linear movement stroke of the driving member 7 can be completely fed back to the main valve core 2 in a “1:1” proportion, and the control precision is high.

[0040] Preferably, the first driving rod 8 and the second driving rod 9 are connected by a ball joint, which eliminates the adverse effect of the rotation of the main valve core 2 along its own axis on the feedback mechanism during the movement of the main valve core 2

[0041] Optionally, as Figure 1As shown, the pilot valve includes a first pilot valve 3 and a second pilot valve 5, the first pilot valve 3 has a first spool 4 and a first unloading passage, and the second pilot valve 5 includes a second spool 6 and a second unloading passage. That is, two independent pilot valves are used to control the opening and closing of the first unloading passage and the second unloading passage, respectively, which is convenient in layout and the layout position can be adjusted adaptively according to the length of the first drive rod 8.

[0042] Preferably, as shown in the drawings, Figure 1 The first pilot valve 3 and / or the second pilot valve 5 are ball valves. It can be understood that the sealing accuracy of the ball valve is high, the control cavity is completely sealed when the ball valve is closed, and the position of the main spool 2 can ensure reliable retention. Even if the main spool 2 is disturbed by external force, the main spool 2 also has a certain anti-disturbance ability.

[0043] In some embodiments, as shown in the drawings, Figure 1 The drive assembly includes a push rod 15, the push rod 15 is arranged on the valve body 1 along the length direction of the main spool 2, and one end of the push rod 15 is connected to the main spool 2 and connected to the end of the control cavity of the main spool 2, and the other end is rotationally connected with the second drive rod 9.

[0044] Preferably, the drive member 7 is a linear actuator.

[0045] Preferably, the linear actuator can be selected from linear motors, electric push rods 15, proportional electromagnets, or all kinds of electromechanical converters that can realize displacement proportional output.

[0046] Preferably, when the first unloading passage and the second unloading passage are both closed, the length of the first drive rod 8 is equal to the interval distance between the first spool 4 and the second spool 6. Therefore, the movement of the first drive rod 8 can sensitively control the opening of the first spool 4 or the second spool 6, and the control accuracy is high.

[0047] Preferably, as shown in the drawings, Figure 2 The end of the first drive rod 8 is provided with a throttling groove.

[0048] Preferably, the throttling groove is a plurality of throttling grooves arranged in the circumferential direction of the first drive rod 8. Therefore, the throttling groove can reduce the instantaneous pressure impact of the pilot ball valve when it is opened, and the opening and closing process of the ball valve is smooth.

[0049] Optionally, the throttling groove extends along the length direction of the first drive rod 8. Therefore, as the pilot spool is closed, the first drive rod 8 gradually moves back, the effective throttling length of the throttling groove gradually increases, and the closing process of the pilot spool gradually tends to be slow, and the opening and closing process is stable.

[0050] Optionally, the throttling groove can be triangular, semicircular, rectangular, etc. in different shapes, and the number can be multiple, as long as it is uniformly distributed in the circumferential direction.

[0051] Preferably, as shown in Figure 1 A one-way valve 10 is arranged between the first control chamber 11 and the oil inlet port to allow oil to flow towards the first control chamber 11, and / or a one-way valve 10 is arranged between the second control chamber 12 and the oil inlet port to allow oil to flow towards the second control chamber 12. In this way, liquid can only flow from the oil inlet port to the control chambers, and not vice versa, so that when the main valve core 2 is stationary at a certain position, the two control chambers form dead-end chambers when the pilot ball valve is closed, ensuring the stability of the position of the main valve core 2.

[0052] Preferably, as shown in Figure 1 A damping hole 14 is arranged between the one-way valve 10 and the oil inlet port to have a flow-limiting effect, avoiding impact on the movement of the main valve core 2 under the pressure of the oil inlet port when the pressure of a certain control is suddenly reduced.

[0053] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0054] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0055] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected or can communicate with each other; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication or interaction relationship of two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0056] In the present application, unless specifically stated and limited otherwise, a first feature "on" or "under" a second feature can be directly in contact with the second feature, or indirectly in contact with the second feature through an intermediate medium. Also, a first feature "over", "above" and "on top of" a second feature can be directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. A first feature "under", "below" and "underneath" a second feature can be directly below or obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0057] In the present application, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material, or characteristic being described is included in at least one embodiment or example of the present application. The illustrative appearances of the above-mentioned terms in various places in the specification are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. Moreover, the terms "first", "second", "third", etc. are used herein merely as identifiers for different elements, regions, layers, or sections, and are not intended to denote a spatial or chronological priority or order except if explicitly so defined. Also, the terms "comprises", "comprising", "includes", "including", or the like are used herein to generally mean comprising, including, or consisting of, unless otherwise indicated.

[0058] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary, and are not to be interpreted as limiting the present application, and that changes, modifications, substitutions and variations can be made therein by those skilled in the art without departing from the scope of the present application.

Claims

1. A two-position two-way proportional valve characterized by, The valve body and the main valve core, the valve body has a cavity, the main valve core is movably arranged in the cavity and the main valve core includes a body and a valve core push block arranged around the body and sealingly fitted with the inner wall of the cavity, the cavity includes a first control cavity and a second control cavity located on both sides of the valve core push block, and the valve body has an oil inlet communicating with the first control cavity and the second control cavity; A mechanical pilot valve assembly is connected to the valve body, and the mechanical pilot valve assembly includes a pilot valve body, a first valve core and a second valve core, and a driving assembly, the pilot valve body has a first oil discharge channel communicating with the first control cavity and a second oil discharge channel communicating with the second control cavity, the first valve core can control the opening and closing of the first oil discharge channel, the second valve core can control the opening and closing of the second oil discharge channel, the axes of the first valve core and the second valve core are collinear, and the first valve core and the second valve core are spaced apart; The driving assembly includes a driving member, a first driving rod and a second driving rod, the first driving rod is transversely arranged between the first valve core and the second valve core, the second driving rod is rotatably connected with the first driving rod through a ball hinge structure, one end of the second driving rod is rotatably connected with the driving member, and the other end is rotatably connected with the main valve core. The connection of the first driving rod and the second driving rod is located at the middle position of the first driving rod, and / or the connection of the first driving rod and the second driving rod is located at the middle position of the second driving rod.

2. The two position two-way proportional valve of claim 1, wherein The end of the first driving rod is provided with a throttling groove.

3. The two position two-way proportional valve of claim 1, wherein, The pilot valve includes a first pilot valve and a second pilot valve, the first pilot valve has the first valve core and the first oil discharge channel, and the second pilot valve includes the second valve core and the second oil discharge channel.

4. The two position two-way proportional valve of claim 1, wherein, The first pilot valve and / or the second pilot valve is a ball valve.

5. The two position two-way proportional valve of claim 4, wherein, The driving assembly includes a push rod, the push rod is arranged on the valve body along the length direction of the main valve core, one end of the push rod is connected with the main valve core, and the other end is rotatably connected with the second driving rod.

6. The two position two-way proportional valve of claim 1, wherein, The driving member is a linear actuator.

7. The two position two-way proportional valve of claim 1, wherein, A one-way valve allowing oil supply towards the first control cavity is arranged between the first control cavity and the oil inlet, and / or a one-way valve allowing oil supply towards the second control cavity is arranged between the second control cavity and the oil inlet.

8. The two position two-way proportional valve of claim 1, wherein, When the first oil discharge channel and the second oil discharge channel are both closed, the length of the first driving rod is equal to the spacing distance between the first valve core and the second valve core.

9. The two position two-way proportional valve according to any one of claims 1-8, characterized in that, ​

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