CN116379030A - Two-position two-way proportional valve - Google Patents

Abstract

The invention discloses a two-position two-way proportional valve which comprises a valve body, a main valve core and a mechanical pilot valve assembly, wherein 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 which are arranged at two 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 discharging channel and a second oil discharging channel which are respectively communicated with the first control cavity and the second control cavity, the first valve core can control the on-off of the first oil discharging channel, the second valve core can control the on-off of the second oil discharging channel, 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 in rotary connection with the first driving rod, one end of the second driving rod is in rotary connection with the driving piece, and the other end of the second driving rod is in rotary connection with the main valve core. The two-position two-way proportional valve adopts a mechanical lever type feedback mode, and has high control precision and low cost.

Description

Two-position two-way proportional valve

Technical Field

The invention relates to the technical field of valve control, in particular to a two-position two-way proportional valve.

Background

The coal face is formed by arranging a plurality of hydraulic supports on the face in sequence, and each hydraulic support is connected with a chute by a pushing jack. Besides supporting the top plate of the working surface, the frame moving and pushing are realized. In order to achieve normal operation of the working surface, a certain degree of straightness needs to be maintained among the plurality of working surface hydraulic supports. In the coal mining process, the chute is a track for running the coal mining machine, the chute is required to keep a certain degree of straightness, a good coal cutting effect of the coal mining machine is achieved, and a working face is basically plane.

At present, most of the pushing hydraulic cylinders adopt a switching valve or a multi-stage speed regulating valve based on time control to realize position control, and because the existing bracket hydraulic system is composed of the switching valves, the stepless proportional control of the opening degree of a main valve core cannot be realized, the control precision is also large in lifting space, and components such as a displacement sensor, a pressure sensor and the like are required to be equipped for regulation and control by utilizing a proportional electromagnetic valve, so that the cost is high, and the control precision is low.

Disclosure of Invention

The invention aims to solve the technical problems of the prior art, and provides a two-position two-way proportional valve which adopts a mechanical lever type feedback mode, and can realize the opening and closing control of a pilot valve without a displacement sensor or a pressure sensor, so that the position control of a main valve core is realized, the control principle is simple, the control precision is higher, the cost is relatively low, and the stepless regulation and control of the opening position of the main valve core can be realized.

The two-position two-way proportional valve of the embodiment of the invention comprises: the main valve core is arranged in the valve body and is provided with a valve core pushing block, the valve body is provided with a first control cavity and a second control cavity, the valve body is provided with an oil inlet, the first control cavity and the second control cavity are communicated with the oil inlet, and the first control cavity and the second control cavity are respectively positioned at two sides of the valve core pushing block; the mechanical pilot valve assembly is connected to the valve body and 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 is provided with a first oil discharging channel and a second oil discharging channel, the first valve core can control the on-off of the first oil discharging channel, the second valve core can control the on-off of the second oil discharging channel, the first oil discharging channel is communicated with the first control cavity, the second oil discharging channel is communicated 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 piece, a first driving rod and a second driving rod, wherein 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 piece, the other end of the second driving rod is rotationally connected with the main valve core, the first driving rod moves towards the first valve core to push the first valve core to be communicated with the first oil discharging channel, and the first driving rod moves towards the second valve core to push the second valve core to be communicated with the second oil discharging channel.

According to the two-position two-way proportional valve disclosed by the embodiment of the invention, the valve body is provided with the first control cavity and the second control cavity which are communicated with the oil inlet, the pilot valve comprises the first valve core, the second valve core, the first oil discharging channel which is communicated with the first valve core and the second oil discharging channel which is communicated with the second valve core, the first valve core can control the on-off of the first oil discharging channel, the second valve core can control the on-off of the second oil discharging channel, the mechanical pilot valve component comprises a driving piece, the first driving rod and the second driving rod, the first driving rod is transversely arranged between the first valve core and the second valve core, one end of the second driving rod is rotationally connected with the driving piece, the other end of the second driving rod is rotationally connected with the main valve core, and the first driving rod and the second driving rod are rotationally connected, so that the driving piece can drive the first driving rod to move towards the first valve core or the second valve core to enable one of the first oil discharging channel and the second oil discharging channel to be opened, hydraulic oil in the control cavity which is communicated with the opened can be opened can pass through the oil discharging channel, the pressure in the control cavity is reduced, the main valve core can drive the pressure in the control cavity under the action of the pressure reducing action of the first valve core and the pressure in the first valve core, the first valve core can be completely reset and the two sides of the valve core can be completely closed, and the valve core can be kept to be completely closed by driving and opened by the first valve core and the pressure under the pressure condition. Therefore, the mechanical pilot valve assembly of the two-position two-way proportional valve adopts a mechanical lever type feedback mode, and can realize the opening and closing control of the pilot valve without setting a displacement sensor or a pressure sensor, so that the position control of the main valve core is realized, the control principle is simple, the control precision is high, the cost is relatively low, and the stepless regulation and control of the opening position of the main valve core can be realized by setting the proportion of the upper rod section and the lower rod section of the second driving rod.

In some embodiments, the connection of the first drive rod and the second drive rod is located at an intermediate position of the first drive rod and/or the connection of the first drive rod and the second drive rod is located at an intermediate position of the second drive rod.

In some embodiments, the end of the first drive rod is provided with a throttling groove.

In some embodiments, the pilot valve includes a first pilot valve having the first spool and the first oil discharge passage and a second pilot valve including the second spool and the second oil discharge passage.

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

In some embodiments, the driving assembly comprises a push rod, the push rod is arranged on the valve body in a penetrating manner 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 of the push rod is connected with the second driving rod in a rotating manner.

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

In some embodiments, the first drive rod and the second drive rod are connected by a ball-and-socket joint structure.

In some embodiments, a check valve allowing oil to be supplied to the first control chamber is arranged between the first control chamber and the oil inlet, and/or a check valve allowing oil to be supplied to the second control chamber is arranged between the second control chamber and the oil inlet.

In some embodiments, the length of the first drive rod is equal to the separation distance between the first spool and the second spool when both the first oil discharge channel and the second oil discharge channel are closed.

Drawings

Fig. 1 is a schematic structural diagram of a two-position two-way proportional valve according to an embodiment of the present invention.

Fig. 2 is a schematic structural view of a first driving lever of a two-position two-way proportional valve according to an embodiment of the present invention.

Reference numerals:

the valve comprises a valve body 1, a main valve core 2, a valve core pushing block 21, a first pilot valve 3, a first valve core 4, a second pilot valve 5, a second valve core 6, a driving piece 7, a first driving rod 8, a second driving rod 9, a one-way valve 10, a first control cavity 11, a second control cavity 12, a working port 13, a damping hole 14 and a push rod 15.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.

As shown in fig. 1, the two-position two-way proportional valve of the embodiment of the invention comprises a valve body 1, a main valve core 2 and a mechanical pilot valve assembly.

Specifically, as shown in fig. 1, the valve body 1 has a cavity, the main valve element 2 is movably disposed in the cavity, the main valve element 2 includes a body and a valve element push block 21 disposed around the body and sealed against the inner wall of the cavity, the cavity includes a first control chamber 11 and a second control chamber 12 disposed on both sides of the valve element 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.

. It can be understood that when the pressures of the first control chamber 11 and the second control chamber 12 are consistent, the two sides of the valve core pushing block 21 are balanced, the main valve core 2 is kept at a fixed opening degree, and when the pressure difference exists between the first control chamber 11 and the second control chamber 12, the valve core pushing block 21 can drive the main valve core 2 to move towards the low pressure side under the action of the pressure difference, so that the control of the opening position of the main valve core 2 is realized.

Further, as shown in fig. 1, the mechanical pilot valve assembly is connected to the valve body 1, and the mechanical pilot valve assembly includes a pilot valve and a driving assembly, the pilot valve includes 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 discharge channel and a second oil discharge channel, the first valve core 4 can control on-off of the first oil discharge channel, the second valve core 6 can control on-off of the second oil discharge channel, the first oil discharge channel is communicated with the first control cavity 11, the second oil discharge channel is communicated with the second control cavity 12, 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 spool 4 and the second spool 6 are parallel to the axis of the main spool 2.

It will be appreciated that when the first valve core 4 controls the first oil discharge channel to open, hydraulic oil in the first control chamber 11 returns towards the first oil discharge channel, the pressure in the first control chamber 11 decreases, the valve core push block 21 moves towards the side of the first control chamber 11 under the action of the pressure difference, and when the first valve core 4 closes the first oil discharge channel again, the first control chamber 11 does not return towards the first oil discharge channel, the first control chamber 11 is sealed again, the pressures on both sides of the valve core push block 21 are balanced again, and the main valve core 2 is kept at a fixed opening degree.

When the second valve core 6 controls the second oil discharging channel to be opened, hydraulic oil in the second control cavity 12 returns towards the second oil discharging channel, the pressure of the second control cavity 12 is reduced, the valve core push block 21 moves towards the side of the second control cavity 12 under the action of pressure difference, when the second valve core 6 closes the second oil discharging channel again, the second control cavity 12 does not return towards the second oil discharging channel, the second control cavity 12 is sealed again, the pressure on two sides of the valve core push block 21 is balanced again, and the main valve core 2 is kept at a fixed opening.

Further, the movement of the first valve core 4 and the second valve core 6 is controlled by a driving assembly, specifically, as shown in fig. 1, the driving assembly comprises a driving piece 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 rotationally connected with the first driving rod 8, one end of the second driving rod 9 is rotationally connected with the driving piece 7, the other end of the second driving rod 9 is rotationally connected with the main valve core 2, the first driving rod 8 moves towards the first valve core 4 to push the first valve core 4 to be communicated with the first oil discharging channel, and the first driving rod 8 moves towards the second valve core 6 to push the second valve core 6 to be communicated with the second oil discharging channel.

As can be understood from this, in order to facilitate understanding, referring to fig. 1, the valve body 1 has an oil supply channel, one end of the oil supply channel is connected to the working port 13, the other end is connected to the oil inlet (P port in fig. 1), the main valve core 2 moves leftwards to open the oil supply channel, the second control cavity 12 is located at the left side of the valve core push block 21, the first control cavity 11 is located at the right side of the valve core push block 21, the first valve core 4 and the second valve core 6 are located at the left and right sides of the first driving rod 8, the second driving rod 9 is located in the middle of the two, when oil is required to be supplied to the working surface, the driving member 7 drags the second driving rod 9 rightwards, then, because the bottom of the second driving rod 9 is rotationally connected with the main valve core 2, the second driving rod 9 can deflect downwards around its connection point with the main valve core 2, the second driving rod 9 can drive the first driving rod 8 rightwards to drive the second valve core 6 to open the second oil discharge channel, the second control cavity 12 returns through the second oil discharge channel, the pressure in the second control cavity 12 is reduced, and the valve core push block 21 drives the main valve core 2 leftwards to move to open the oil supply channel.

It will be appreciated that when the main valve element 2 moves left to open as shown in fig. 1, the main valve element 2 may drag the second driving rod 9 to the left, so that the second driving rod 9 may rotate upward around the connection point between the main valve element 2 and the driving member 7, the second driving rod 9 may drive the first driving rod 8 to move left, until the first driving rod 8 moves to the initial position again, the second valve element 6 may be closed, the second oil discharge channel is disconnected, the second control cavity 12 is sealed again, and the pressures at both sides of the valve element push block 21 remain balanced, so that the main valve element 2 does not move any more and remains at a fixed opening.

Further, when the main valve core 2 needs to be controlled to be closed, the driving piece 7 can drag the second driving rod 9 leftwards so as to drive the first driving rod 8 to move leftwards, and then the first driving rod 8 drives the first valve core 4 to open the first oil discharging channel, hydraulic oil in the first control cavity 11 can return oil through the first oil discharging channel, the pressure in the first control cavity 11 is reduced, and the valve core pushing block 21 drives the main valve core 2 to move rightwards so as to close the oil supplying channel.

Therefore, the mechanical pilot valve assembly of the two-position two-way proportional valve adopts a mechanical lever type feedback mode, and can realize the opening and closing control of the pilot valve without setting a displacement sensor or a pressure sensor, so that the position control of the main valve core 2 is realized, the control principle is simple, the control precision is high, and the cost is relatively low.

Further, the proportional control of the opening position of the main valve core 2 may be achieved by a mechanical lever structure, specifically, as shown in fig. 1, a connection point of the first driving rod 8 and the second driving rod 9 may be used as a base point, an upper rod section is connected with the driving member 7, and a lower rod section is connected with the main valve core 2, so that stepless regulation and control of the opening position of the main valve core 2 may be achieved by dividing the length ratio of the upper rod section and the lower rod section.

For example, when the lengths of the upper and lower rod sections are equal, taking the process of opening the main valve element 2 as an example, taking the stroke of the driving member 7 dragging the second driving rod 9 rightward as s, when the moving stroke of the main valve element 2 is s due to the identical lengths of the upper and lower rod sections, the second driving rod 9 returns to the initial position again, the second valve element 6 is closed again, and the main valve element 2 is maintained at the fixed opening degree. In this case, the "1:1" ratio of the displacement travel of the main valve element 2 can be controlled by controlling the drag travel of the drive element 7.

For another example, when the ratio of the length of the lower rod section to the length of the upper rod section is 2:1, the driving piece 7 is taken to drag the stroke of the second driving rod 9 to the right to be L, and when the stroke of the main valve core 2 to move to the right is 2L, the second driving rod 9 can realize the reset, namely, the proportion control of '1:2' of the movement stroke of the main valve core 2 can be realized by controlling the dragging stroke of the driving piece 7. It will be appreciated that the lengths of the upper and lower rod sections may be of any ratio so as to achieve stepless control of the opening position of the main valve spool 2.

In other words, the driving piece 7 drives the first driving rod 8 to move so as to control the main valve core 2 to be opened, and the opening of the main valve core 2 is fed back to the first driving rod 8 and drives 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 section and the lower rod section, and the mechanical pilot valve assembly can realize stepless control of the opening position of the main valve core 2 because the lengths of the upper rod section and the lower rod section can be set at will.

It will be appreciated that when the first valve core 4 and the second valve core 6 are both equipped with a return spring, and the first driving rod 8 is at the initial position, the first valve core 4 and the second valve core 6 are both at the closed state under the action of the return spring, that is, when the first driving rod 8 moves towards one of the valve cores, the other valve core is at the closed state, and the movement of the main valve core 2 is fed back to the first driving rod 8 and drives the first driving rod 8 to reset, when the main valve core 2 moves to the preset opening position, the first driving lever 8 is completely reset to the initial position, 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 closed, and the main valve core 2 can be kept at the fixed opening.

The two-position two-way proportional valve of the embodiment of the invention, the valve body 1 is provided with a first control cavity 11 and a second control cavity 12 which are communicated with an oil inlet, the pilot valve comprises a first valve core 4, a second valve core 6, a first oil discharging channel communicated with the first valve core 4 and a second oil discharging channel communicated with the second valve core 6, the first valve core 4 can control the on-off of the first oil discharging channel, the second valve core 6 can control the on-off of the second oil discharging channel, the mechanical pilot valve assembly comprises a driving piece 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, one end of the second driving rod 9 is rotationally connected with the driving piece 7, the other end of the second driving rod 9 is rotationally connected with the main valve core 2, and the first driving rod 8 and the second driving rod 9 are rotationally connected, thereby, the driving piece 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 that one of the first oil discharging channel and the second oil discharging channel is opened, hydraulic oil in a control cavity communicated with the opened oil discharging channel can return oil through the oil discharging channel, the pressure in the control cavity is reduced, the main valve core 2 can move to open or close the oil supplying channel under the action of 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, when the first driving rod 8 is completely reset, the first valve core 4 and the second valve core 6 are closed, the first control cavity 11 and the second control cavity 12 are closed, the pressure at two sides of the valve core pushing block 21 is kept balanced, and the valve core can be kept at a fixed opening.

Therefore, the mechanical pilot valve assembly of the two-position two-way proportional valve adopts a mechanical lever type feedback mode, and can realize the opening and closing control of the pilot valve without setting a displacement sensor or a pressure sensor, so that the position control of the main valve core 2 is realized, the control principle is simple, the control precision is high, the cost is relatively low, and the stepless regulation and control of the opening position of the main valve core 2 can be realized by setting the proportion of the upper rod section and the lower rod section of the second driving rod 9.

Preferably, the connection between the first driving rod 8 and the second driving rod 9 is located at the middle position of the first driving rod 8, and the connection between the first driving rod 8 and the second driving rod 9 is located at the middle position of the second driving rod 9. Therefore, the linear movement stroke of the driving piece 7 can be completely fed back to the main valve core 2 according to the proportion of 1:1, and the control accuracy is high.

Preferably, the first 8 and second 9 drive levers are ball-hinged, eliminating the detrimental effect of the main spool 2 rotating along its own axis on the feedback mechanism when in motion

Alternatively, as shown in fig. 1, the pilot valve includes a first pilot valve 3 and a second pilot valve 5, the first pilot valve 3 having a first spool 4 and a first oil discharge passage, and the second pilot valve 5 including a second spool 6 and a second oil discharge passage. The two independent pilot valves are adopted to respectively control the on-off of the first oil discharging channel and the second oil discharging channel, the layout is convenient, and the layout position can be adaptively adjusted according to the length of the first driving rod 8.

Preferably, as shown in fig. 1, the first pilot valve 3 and/or the second pilot valve 5 are ball valves. It can be understood that the sealing precision of the ball valve is high, and when the ball valve is closed, the control cavity is completely sealed, the position of the main valve core 2 can ensure reliable stay, and even if the main valve core 2 is interfered by external force, the main valve core 2 has certain disturbance rejection capability.

In some embodiments, as shown in fig. 1, the driving assembly includes a push rod 15, where the push rod 15 is disposed on the valve body 1 along the length direction of the main valve core 2, and one end of the push rod 15 is connected to one end of the main valve core 2, which faces the control chamber of the main valve core 2, and the other end is rotatably connected to the second driving rod 9.

Preferably, the driving member 7 is a linear actuator.

Preferably, the linear actuator can select all electromechanical converters which can realize displacement proportional output, such as a linear motor, an electric push rod 15, a proportional electromagnet or a motor and a ball screw.

Preferably, the length of the first driving rod 8 is equal to the distance between the first spool 4 and the second spool 6 when both the first oil discharge passage and the second oil discharge passage are closed. Thus, the first valve element 4 or the second valve element 6 can be sensitively controlled to be opened by the movement of the first driving lever 8, and the control accuracy is high.

Preferably, as shown in fig. 2, the end of the first driving rod 8 is provided with a throttling groove.

Preferably, the throttle groove is a plurality of pieces of the first driving rod 8 circumferentially spaced apart. Therefore, the throttling groove can reduce the instant pressure impact of the pilot ball valve when the pilot ball valve is opened, and the opening or closing process of the ball valve is gentle.

Optionally, the throttling groove extends along the length direction of the first driving rod 8, so that as the pilot valve element is closed, the first driving rod 8 gradually moves back, the effective throttling length of the throttling groove gradually increases, the closing process of the pilot valve element gradually tends to be slow, and the opening and closing process is stable.

Optionally, the throttling grooves can be triangular, semicircular, rectangular and other different shapes, and the number of the throttling grooves can be multiple, so that the requirement of uniform distribution in the circumferential direction is met.

Preferably, as shown in fig. 1, a one-way valve 10 allowing oil to be supplied towards the first control chamber 11 is arranged between the first control chamber 11 and the oil inlet, and/or a one-way valve 10 allowing oil to be supplied towards the second control chamber 12 is arranged between the second control chamber 12 and the oil inlet. Therefore, liquid can only flow into the control cavity from the oil inlet, but cannot flow reversely, so that when the main valve core 2 is stopped at a certain position, two control cavities form a closed cavity when the pilot ball valve is closed, and the stability of the position of the main valve core 2 is ensured.

Preferably, as shown in fig. 1, a damping hole 14 is arranged between the check valve 10 and the oil inlet, which has the function of limiting flow and prevents the motion of the main valve core 2 from being impacted under the action of the pressure of the oil inlet when a certain control strong pressure suddenly decreases.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims (10)

1. A two-position two-way proportional valve, comprising:

the valve body is provided with a cavity, the main valve core is movably arranged in the cavity, the main valve core comprises a body and a valve core pushing block which is annularly arranged at the periphery of the body and is in sealing fit with the inner wall of the cavity, the cavity comprises a first control cavity and a second control cavity which are positioned at two sides of the valve core pushing block, and the valve body is provided with an oil inlet communicated with the first control cavity and the second control cavity;

the mechanical pilot valve assembly is connected to the valve body and comprises a pilot valve body, a first valve core, a second valve core and a driving assembly, wherein the pilot valve body is provided with a first oil discharging channel communicated with the first control cavity and a second oil discharging channel communicated with the second control cavity, the first valve core can control the on-off of the first oil discharging channel, the second valve core can control the on-off of the second oil discharging 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;

the driving assembly comprises a driving piece, a first driving rod and a second driving rod, wherein 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 piece, and the other end of the second driving rod is rotationally connected with the main valve core.

2. The two-position two-way proportional valve of claim 1, wherein a junction of the first drive rod and the second drive rod is located in an intermediate position of the first drive rod and/or a junction of the first drive rod and the second drive rod is located in an intermediate position of the second drive rod.

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

4. The two-position two-way proportional valve of claim 1, wherein the pilot valve comprises a first pilot valve having the first spool and the first oil discharge passage and a second pilot valve comprising the second spool and the second oil discharge passage.

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

6. The two-position two-way proportional valve according to claim 1, wherein the driving assembly comprises a push rod, the push rod is arranged on the valve body in a penetrating manner 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 of the push rod is rotatably connected with the second driving rod.

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

8. The two-position two-way proportional valve of claim 1, wherein the first drive rod and the second drive rod are connected by a ball-and-socket joint structure.

9. The two-position two-way proportional valve according to claim 1, wherein a one-way valve allowing oil to be supplied to the first control chamber is arranged between the first control chamber and the oil inlet, and/or a one-way valve allowing oil to be supplied to the second control chamber is arranged between the second control chamber and the oil inlet.

10. The two-position two-way proportional valve of any one of claims 1-9, wherein a length of the first drive rod is equal to a separation distance between the first spool and the second spool when both the first oil discharge passage and the second oil discharge passage are closed.

Images