Valve element follow-up type water-based proportional directional valve and control method thereof

Abstract

The invention relates to the technical field of hydraulic control, and provides a valve element follow-up type water-based proportional directional valve and a control method thereof.The valve element follow-up type water-based proportional directional valve comprises a valve body, a valve element, a valve element and a valve element, and a liquid inlet and a liquid return opening are formed in the valve body; the main valve core is movably arranged in the valve body and is connected with the valve body to form a main valve core control cavity; the pilot valve assembly is arranged in the valve body and comprises a pilot valve element, a ball and an ejector rod, the pilot valve element is installed on one side of the main valve element, the pilot valve element is provided with a liquid passing cavity communicated with the liquid inlet, the liquid passing cavity is communicated with the main valve element control cavity, the main valve element control cavity is connected with the liquid return opening, and the ball is movably installed in the liquid passing cavity; one end of the ball is connected with the pilot valve element through a first elastic piece, and the other end of the ball is connected with the ejector rod. The liquid inlet flow can be controlled through movement of the main valve element along with the pilot valve ejector rod, the reversing valve can automatically recover to the balance state, and the control precision and control convenience of the reversing valve are improved.

Description

Technical Field

[0001] The present disclosure relates to the field of hydraulic control technology, and in particular to a valve core follower type water-based proportional reversing valve and a control method thereof. Background Art

[0002] At present, the switch-type proportional reversing valve is used in coal mining to control the action of the hydraulic support. The switch-type proportional reversing valve has only two working states: "fully open" and "fully closed", that is, the hydraulic support can only move at a constant speed, which is difficult to meet the precise control of the hydraulic support posture and the precise pushing and sliding of the hydraulic support, and it is impossible to achieve the soft start of the hydraulic cylinder, which affects the service life of the hydraulic cylinder, causes the quality of the working face support to decline, affects the straightness of the scraper conveyor, and reduces the service life of the scraper conveyor. In addition, the existing proportional reversing valve has a complex structure and slow response speed, resulting in poor control accuracy. Summary of the invention

[0003] The purpose of the embodiments disclosed herein is to provide a valve core follower type water-based proportional reversing valve and a control method thereof, so as to at least solve the technical problem in the prior art that the proportional reversing valve has poor control accuracy and affects the service life of controlled loads such as hydraulic cylinders.

[0004] In order to solve the above technical problems, the embodiments of the present disclosure adopt the following technical solutions:

[0005] In a first aspect, an embodiment of the present disclosure provides a valve core follower type water-based proportional reversing valve, comprising:

[0006] A valve body, wherein the valve body is provided with a liquid inlet and a liquid return port;

[0007] A main valve core is movably disposed in the valve body and connected with the valve body to form a main valve core control chamber;

[0008] A pilot valve assembly is arranged in the valve body, comprising a pilot valve core, a ball and a push rod, wherein the pilot valve core is installed on one side of the main valve core, the pilot valve core has a liquid passage cavity communicated with the liquid inlet, the liquid passage cavity is communicated with the main valve core control cavity, the main valve core control cavity is connected with the liquid return port, the ball is movably installed in the liquid passage cavity, one end of the ball is connected to the pilot valve core through a first elastic member, and the other end of the ball is connected to the push rod;

[0009] The push rod is subjected to force that can act on the ball to control the connection state of the liquid passage cavity, thereby adjusting the pressure of the main valve core control cavity and pushing the main valve core to move with the push rod.

[0010] In some embodiments, the pilot valve core is embedded in one end of the main valve core, and a first flow channel is provided between the main valve core and the pilot valve core.

[0011] A ball seat for mounting the ball is arranged in the liquid passage chamber, and a second flow channel is arranged between the ball seat and the liquid passage chamber.

[0012] In some embodiments, the valve core follower type water-based proportional reversing valve also includes a main valve sleeve, which is movably arranged in the valve body, and the main valve sleeve is connected to the valve body to form a main valve sleeve control chamber, and the main valve sleeve is connected to the main valve core to form the main valve core control chamber, and the main valve sleeve control chamber is connected to the main valve core control chamber.

[0013] In some embodiments, the main valve core is connected to the main valve sleeve from a first end of the main valve sleeve, and the push rod extends into the main valve sleeve from a second end of the main valve sleeve.

[0014] The main valve sleeve is provided with a pilot valve return liquid chamber connected to the return liquid port, and a third flow channel is provided between the push rod and the main valve sleeve, one end of the third flow channel is connected to the main valve core control chamber, and the other end of the third flow channel is connected to the pilot valve return liquid chamber.

[0015] In some embodiments, a flow cross-section of the second flow channel is greater than a flow cross-section of the third flow channel.

[0016] In some embodiments, a first damping hole connecting the liquid inlet and the liquid passage chamber is provided in the main valve core.

[0017] The first damping hole is arranged close to the liquid inlet along the radial direction of the main valve core, a liquid inlet channel is arranged between the first damping hole and the liquid passage chamber, and the liquid inlet channel is arranged along the axial direction of the main valve core.

[0018] In some embodiments, the main valve sleeve is provided with a second damping hole communicating with the main valve sleeve control chamber and the main valve core control chamber, and the second damping hole is arranged along the axial direction of the main valve sleeve.

[0019] In some embodiments, the main valve sleeve is further provided with a third damping hole communicating with the pilot valve liquid return chamber and the liquid return port.

[0020] In some embodiments, a gap is provided between the main valve sleeve and the valve body to form a liquid return channel communicating with the liquid return port and the third damping hole.

[0021] In a second aspect, an embodiment of the present disclosure provides a control method for a spool-following water-based proportional directional control valve, which is applied to a valve controller of the spool-following water-based proportional directional control valve, and the method includes:

[0022] Acquiring a first displacement signal of the push rod;

[0023] Obtain the action signal of the controlled load;

[0024] The movement of the push rod is controlled according to the first displacement signal of the push rod and the action signal of the controlled load to drive the movement of the main valve core, adjust the flow between the liquid inlet and the main valve core core hole of the main valve core, and then adjust the action parameters of the controlled load, wherein the action parameters include movement direction and / or movement speed.

[0025] The embodiment of the present disclosure provides a valve core follower type water-based proportional reversing valve and a control method thereof, wherein a liquid inlet and a liquid return port are provided on the valve body, a main valve core is movably arranged in the valve body and connected to the valve body to form a main valve core control chamber, a pilot valve core of a pilot valve assembly is connected to the main valve core, a liquid passage chamber connected to the liquid inlet is provided on the pilot valve core, the liquid passage chamber is connected to the main valve core control chamber, the main valve core control chamber is connected to the liquid return port, a ball is movably installed in the liquid passage chamber, one end of the ball is connected to the pilot valve core through a first elastic member, and the other end of the ball is connected to the pilot valve core through a first elastic member. When the push rod is moved by force, the movement of the ball in the liquid passage chamber can affect the state of the pilot valve port, causing it to change from a balanced state to a continuously open or continuously closed state, thereby affecting the working pressure of the main valve core control chamber, and pushing the main valve core to follow the movement of the push rod until the main valve core follows the movement of the push rod The distance, the pilot valve port is restored to a balanced state, and the main valve core moves with the pilot valve push rod to control the liquid inlet flow, and the water-based proportional reversing valve can automatically restore the balanced state, thereby improving the control accuracy and convenience of the water-based proportional reversing valve, and thereby increasing the service life of the controlled load. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0027] Figure 1 It is a structural schematic diagram of a valve core follower type water-based proportional reversing valve according to an embodiment of the present disclosure;

[0028] Figure 2 for Figure 1 Schematic diagram of the local enlarged structure in.

[0029] Reference numerals:

[0030] 1-valve body, 11-liquid inlet, 12-liquid return port; 2-main valve core, 21-main valve core control chamber, 22-main valve core core hole, 23-load interface, 24-installation groove, 25-first damping hole, 26-liquid inlet channel; 31-pilot valve core, 311-liquid passage chamber, 312-pilot valve port, 32-ball, 33-rod, 331-rod mounting seat, 34-first elastic member, 35-pilot valve return chamber, 36-ball seat; 41-first flow channel, 42-second flow channel, 43-third flow channel; 5-main valve sleeve, 51-main valve sleeve control chamber, 52-second damping hole, 53-third damping hole; 6-return liquid channel; 7-second elastic member; 8-driving mechanism. DETAILED DESCRIPTION

[0031] Various aspects and features of the present disclosure are described herein with reference to the drawings.

[0032] It should be understood that various modifications may be made to the embodiments of the present application. Therefore, the above description should not be considered as limiting, but only as an example of an embodiment. Other modifications within the scope and spirit of the present disclosure will occur to those skilled in the art.

[0033] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the general description of the present disclosure given above and the detailed description of the embodiments given below, serve to explain the principles of the present disclosure.

[0034] These and other characteristics of the present disclosure will become apparent from the following description of a preferred form of embodiment given as a non-limiting example, with reference to the attached drawings.

[0035] It should also be understood that, although the present disclosure has been described with reference to some specific examples, those skilled in the art will be able to realize many other equivalent forms of the present disclosure that have the features described in the claims and are therefore within the scope of protection defined thereby.

[0036] The above and other aspects, features and advantages of the present disclosure will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

[0037] Specific embodiments of the present disclosure are described hereinafter with reference to the accompanying drawings; however, it should be understood that the embodiments claimed are merely examples of the present disclosure, which may be implemented in a variety of ways. Well-known and / or repeated functions and structures are not described in detail to avoid obscuring the present disclosure with unnecessary or redundant details. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but merely serve as a basis and representative basis for the claims to teach those skilled in the art to use the present disclosure in a variety of ways with substantially any suitable detailed structure.

[0038] This specification may use the phrases "in one embodiment," "in another embodiment," "in a further embodiment," or "in other embodiments," all of which may refer to one or more of the same or different embodiments according to the present disclosure.

[0039] Embodiment 1

[0040] Figure 1 and Figure 2 The structure diagram of the valve core follower type water-based proportional reversing valve according to the embodiment of the present disclosure is shown. Figure 1 and Figure 2 As shown, a valve core follower type water-based proportional reversing valve provided in an embodiment of the present disclosure includes:

[0041] A valve body 1, wherein the valve body 1 is provided with a liquid inlet 11 (P port) and a liquid return port 12 (T port);

[0042] A main valve core 2 is movably disposed in the valve body 1 and connected with the valve body 1 to form a main valve core control chamber 21;

[0043] The pilot valve assembly is arranged in the valve body 1, and includes a pilot valve core 31, a ball 32 and a push rod 33. The pilot valve core 31 is installed on one side of the main valve core 2. The pilot valve core 31 has a liquid passage cavity 311 connected to the liquid inlet 11, the liquid passage cavity 311 is connected to the main valve core control cavity 21, and the main valve core control cavity 21 is connected to the liquid return port 12. The ball 32 is movably installed in the liquid passage cavity 311, one end of the ball 32 is connected to the pilot valve core 31 through a first elastic member 34, and the other end of the ball 32 is connected to the push rod 33;

[0044] The push rod 33 is able to act on the ball 32 to control the connection state of the liquid passage chamber 311 , thereby adjusting the pressure of the main valve core control chamber 21 and pushing the main valve core 2 to move along with the push rod 33 .

[0045] Specifically, a pilot valve liquid return chamber 35 is provided between the main valve core control chamber 21 and the liquid return port 12. When the push rod 33 is forced to move to the left, the push rod 33 pushes the ball 32 to move to the left, and the right side of the ball 32 is separated from the cavity wall of the liquid passage chamber 311, so that the cavity opening at the right end of the liquid passage chamber 311 (the cavity opening is the pilot valve opening 312 of the pilot valve core 31) is opened, so that the liquid passage chamber 311 is connected with the main valve core control chamber 21, and the high-pressure liquid enters the main valve core control chamber 21 and the pilot valve liquid return chamber 35 after passing through the liquid inlet 11 and the liquid passage chamber 311 in turn, and the pressure in the main valve core control chamber 21 increases, and the high-pressure liquid in the main valve core control chamber 21 pushes the pilot valve core 31 and the main valve core 2 to move to the left together, until the inner wall of the liquid passage chamber 311 contacts the ball 32, and the cavity opening at the right end of the liquid passage chamber 311 is closed, so that the pilot valve opening 312 returns to a balanced state.

[0046] During the movement of the push rod 33 to the left, the distance that the main valve core 2 moves to the left can be controlled by controlling the distance that the push rod 33 moves to the left (the distances that the two move are the same), thereby controlling the opening between the liquid inlet 11 and the main valve core hole 22 of the main valve core 2, and further controlling the flow of the main valve core 2 to the controlled load. The main valve core 2 is provided with a load interface 23 connected to the controlled load (such as a hydraulic cylinder). When the push rod 33 controls the main valve core 2 to move to the left and stops at a certain position, the opening between the liquid inlet 11 and the main valve core hole 22 of the main valve core 2 is controlled.

[0047] When the push rod 33 is forced to move to the right, the push rod 33 separates from the ball 32, and the ball 32 is pushed to the right by the spring force and the liquid pressure to contact the wall of the liquid chamber 311, thereby closing the pilot valve port 312 of the pilot valve core 31, so that the high-pressure liquid flowing into the liquid chamber 311 from the liquid inlet 11 cannot flow into the main valve core control chamber 21. When the pilot valve port 312 is closed, the liquid in the main valve core control chamber 21 enters the pilot valve liquid return chamber 35 and then flows out through the liquid return port 12, causing the pressure in the main valve core control chamber 21 to decrease. The ball 32 moves rightward under the push of the liquid in the liquid chamber 311 located on the left side of the main valve core control chamber 21 and the elastic force of the first elastic member 34, and the ball 32 contacts the push rod 33 again until the rightmost side of the ball 32 is separated from the cavity wall of the liquid chamber 311, and the pilot valve port 312 of the pilot valve core 31 is opened. After the pilot valve port 312 is opened, similar to the above-mentioned push rod 33 being forced to move leftward to push the main valve core 2 to move leftward, the liquid chamber 311 and the first elastic member 34 are moved rightward. The main valve core control chamber 21 is connected, and the high-pressure liquid enters the main valve core control chamber 21 and the pilot valve return chamber 35 after passing through the liquid inlet 11 and the liquid passage chamber 311 in turn. The pressure in the main valve core control chamber 21 increases, and the high-pressure liquid in the main valve core control chamber 21 pushes the pilot valve core 31 and the main valve core 2 to move to the left together until the inner wall of the liquid passage chamber 311 contacts the ball 32, and the cavity opening at the right end of the liquid passage chamber 311 is closed, so that the pilot valve opening 312 is restored to a balanced state, that is, the main valve core 2 moves to the right first and then to the left with the rightward movement of the push rod 33, until the pressure on both sides of the ball 32 is balanced and the left and right movement stops, so that the pilot valve opening 312 is restored to a balanced state. In this process, when the push rod 33 moves to the right to control the main valve core 2 to stop at a certain position (the stop position of the push rod 33 moving to the right), the opening between the liquid inlet 11 and the main valve core core hole 22 of the main valve core 2 is controlled.

[0048] It should be noted that when the push rod 33 is forced to move to the right, the ball 32 moves to the right under the action of the left liquid pressure and the elastic force of the first elastic member 34, and the pilot valve core 31 also moves to the right under the push of the liquid in the liquid chamber 311. After the ball 32 moves to contact and abut against the push rod 33, the rightmost side of the ball 32 is separated from the cavity wall of the liquid chamber 311, and the pilot valve port 312 of the pilot valve core 31 is opened.

[0049] It should be noted that, when the main valve core 2 moves to the left along with the push rod 33, part of the high-pressure liquid will also flow to the return liquid port 12. Therefore, the opening of the return liquid port 12 can be reduced or the opening of the pilot valve return liquid chamber 35 connected to the return liquid port 12 can be reduced, so that the return liquid flow rate of the reversing valve is less than the inlet liquid flow rate, thereby ensuring that the main valve core 2 moves to the left as a whole.

[0050] The valve core follower type water-based proportional reversing valve provided in the embodiment of the present disclosure is provided with a liquid inlet 11 and a liquid return port 12 on the valve body 1, the main valve core 2 is movably arranged in the valve body 1 and connected to the valve body 1 to form a main valve core control chamber 21, the pilot valve core 31 of the pilot valve assembly is connected to the main valve core 2, a liquid passage chamber 311 connected to the liquid inlet 11 is provided on the pilot valve core 31, the liquid passage chamber 311 is connected to the main valve core control chamber 21, the main valve core control chamber 21 is connected to the liquid return port 12, a ball 32 is movably installed in the liquid passage chamber 311, one end of the ball 32 is connected to the pilot valve core 31 through a first elastic member 34, the ball The other end of the ball 32 is connected to the push rod 33. When the push rod 33 is moved by force, the movement of the ball 32 in the liquid chamber 311 can affect the state of the pilot valve port 312, so that it can be changed from a balanced state to a continuously open or continuously closed state, thereby affecting the working pressure of the main valve core control chamber, pushing the main valve core 2 to follow the push rod 33 to move until the main valve core 2 moves the same distance as the push rod, so that the pilot valve port 312 can restore to a balanced state, and the main valve core 2 can move with the pilot valve push rod to control the liquid inlet flow, and can make the water-based proportional reversing valve automatically restore to a balanced state, thereby improving the control accuracy and control convenience of the water-based proportional reversing valve, and thereby increasing the service life of the controlled load.

[0051] In some embodiments, the pilot valve core 31 is embedded in one end of the main valve core 2, and a first flow channel 41 is provided between the main valve core 2 and the pilot valve core 31.

[0052] A ball seat 36 for mounting the ball 32 is disposed in the liquid passage chamber 311 , and a second flow channel 42 is defined between the ball seat 36 and the liquid passage chamber 311 .

[0053] The main valve core 2 is provided with a mounting groove 24 for mounting the pilot valve core 31 . A gap is provided between the bottom of the mounting groove 24 and the first end of the pilot valve core 31 to form a first flow channel 41 .

[0054] The mounting groove 24 is preferably a T-shaped groove having a limiting portion, and the pilot valve core 31 and the mounting groove 24 are connected to the main valve core 2 and the pilot valve core 31 reliably.

[0055] The ball seat 36 is installed in the liquid passage chamber 311, and one end of the ball seat 36 is provided with a connecting portion for installing the first elastic member 34. The first elastic member 34 is sleeved on the connecting portion and is located between the bottom of the installation groove 24 and one end of the ball seat 36. The other end of the ball seat 36 is provided with a ball groove for installing the ball 32. A second flow channel 42 is formed between the outer wall of the ball seat 36 close to the ball groove and the inner wall of the liquid passage chamber 311, so that the high-pressure liquid entering the valve body 1 from the liquid inlet 11 can enter the liquid passage chamber 311 through the first flow channel 41, and flow out of the liquid passage chamber 311 to the main valve core control chamber 21 through the second flow channel 42.

[0056] In some embodiments, the valve core follower type water-based proportional reversing valve also includes a main valve sleeve 5, which is movably arranged in the valve body 1, and the main valve sleeve 5 is connected to the valve body 1 to form a main valve sleeve control chamber 51, and the main valve sleeve 5 is connected to the main valve core 2 to form the main valve core control chamber 21, and the main valve sleeve control chamber 51 is connected to the main valve core control chamber 21.

[0057] like Figure 1 and Figure 2 As shown, the main valve sleeve control chamber 51 is located on the right side of the main valve core control chamber 21. When the high-pressure liquid in the main valve core control chamber 21 pushes the pilot valve core 31 and the main valve core 2 to move to the left, part of the high-pressure liquid in the main valve core control chamber 21 will flow into the main valve sleeve control chamber 51, pushing the main valve sleeve 5 to move to the left, blocking and closing the return liquid port 12, and ensuring that the main valve core 2 moves with the push rod 33. In this way, through the linkage of the main valve sleeve 5 and the main valve core 2, the required control components can be reduced (reducing the control of the return liquid port 12), ensuring the linkage control of the water-based proportional reversing valve, and further improving the control accuracy.

[0058] In some embodiments, the main valve core 2 is connected to the main valve sleeve 5 from a first end thereof, and the push rod 33 extends into the main valve sleeve 5 from a second end thereof.

[0059] The main valve sleeve 5 is provided with a pilot valve return liquid chamber 35 connected to the return liquid port 12, and a third flow channel 43 is provided between the push rod 33 and the main valve sleeve 5, one end of the third flow channel 43 is connected to the main valve core control chamber 21, and the other end of the third flow channel 43 is connected to the pilot valve return liquid chamber 35.

[0060] The main valve core 2 is connected to the main valve sleeve 5 from the first end to form a cavity enclosed by the main valve core control cavity 21. The push rod 33 can extend from the second end of the main valve sleeve 5 into the main valve sleeve 5 (inside the main valve core control cavity 21) and is connected to the ball 32. A pilot valve return cavity 35 is provided on the main valve sleeve 5 along its radial direction, and an installation cavity connected to the push rod 33 is provided on the main valve sleeve 5 along its axial direction. There is a gap between the push rod 33 and the cavity wall of the installation cavity to form a third flow channel 43. In this way, there is no need to set a special flow channel in the main valve sleeve 5 to connect the main valve core control cavity 21 with the pilot valve return cavity 35, and the pilot valve return cavity 35 is provided on the main valve sleeve 5, which is convenient for processing.

[0061] In other embodiments, a push rod mounting seat 331 is installed in the mounting cavity, and the push rod 33 passes through the push rod mounting seat 331 and extends into the main valve core control cavity 21. There is a gap between the push rod 33 and the push rod mounting seat 331 to form the above-mentioned third flow channel 43. The assembly is facilitated by setting the push rod mounting seat 331.

[0062] In some embodiments, a flow cross-section of the second flow channel 42 is greater than a flow cross-section of the third flow channel 43 .

[0063] When the pilot valve port 312 is opened, since the flow cross-section of the second flow channel 42 is larger than the flow cross-section of the third flow channel 43, the liquid inlet speed of the reversing valve is greater than the liquid outlet speed, and the pressure in the main valve core control chamber 21 increases to push the main valve core 2 to move. When the pilot valve port 312 is closed, since no working fluid flows out, the main valve core control chamber 21 is convenient to naturally release the pressure to a low pressure, which can greatly simplify the structure of the follow-up valve core and improve the follow-up control effect.

[0064] In some embodiments, the main valve core 2 is provided with a first damping hole 25 communicating with the liquid inlet 11 and the liquid passage chamber 311.

[0065] The first damping hole 25 is arranged near the liquid inlet 11 along the radial direction of the main valve core 2, and a liquid inlet channel 26 is arranged between the first damping hole 25 and the liquid passage chamber 311, and the liquid inlet channel 26 is arranged along the axial direction of the main valve core 1. The high-pressure liquid entering the liquid inlet 11 can be quickly guided to the liquid passage chamber 311 through the first damping hole 25 and the liquid inlet channel 26.

[0066] In some embodiments, the main valve sleeve 5 is provided with a second damping hole 52 connecting the main valve sleeve control chamber 51 and the main valve core control chamber 21. The second damping hole 52 is arranged along the axial direction of the main valve sleeve 5 to facilitate the introduction of high-pressure liquid into the main valve sleeve control chamber 51.

[0067] In some embodiments, the main valve sleeve 5 is further provided with a third damping hole 53 connecting the pilot valve liquid return chamber 35 and the liquid return port 12, so as to facilitate the liquid in the pilot valve liquid return chamber 35 to be led out to the liquid return port 12. The third damping hole 53 is preferably arranged obliquely to reduce the liquid return path.

[0068] In some embodiments, there is a gap between the main valve sleeve 5 and the valve body 1 to form a liquid return channel 6 connecting the liquid return port 12 and the third damping hole 53 to facilitate liquid return, and the liquid return channel 6 can be formed by machining a groove on the outer periphery of the main valve sleeve 5, which is easy to process.

[0069] like Figure 1 and Figure 2 As shown, the outer periphery of the main valve core 2 is also sleeved with a second elastic member 7, which is arranged on a side close to the load interface 23, so that after the main valve core 2 moves to the left, the elastic force of the second elastic member 7 can push the main valve core 2 to move rightward and reset.

[0070] like Figure 1 As shown, the valve core follower type water-based proportional reversing valve also includes a driving mechanism 8 connected to the push rod 33, and the driving mechanism 8 is an electric push rod or a linear motor.

[0071] The main valve core 2, the pilot valve core 31 and the push rod 33 are arranged in sequence along the axial direction of the valve body 1. For the convenience of control, an electric push rod or a linear motor connected to the push rod 33 is arranged on one axial side of the valve body 1 to facilitate the push rod 33 to move linearly, thereby improving the control effect of the water-based proportional reversing valve. The valve core follower type water-based proportional reversing valve is arranged axially as a whole, which can be applied to situations where the arrangement space is narrow, thereby improving the application range of the water-based proportional reversing valve.

[0072] In this embodiment, other liquid inlet channels or liquid return channels can be processed on the main valve core 2, the main valve sleeve 5 and other components in the valve body 1 according to specific needs. The specific structure of the liquid inlet channel or liquid return channel is not specifically limited in this disclosure.

[0073] Embodiment 2

[0074] The present disclosure provides a control method for a valve core follower type water-based proportional directional control valve, which is applied to a valve controller of the valve core follower type water-based proportional directional control valve. The method includes:

[0075] S101: Acquire a first displacement signal of the push rod 33;

[0076] S102: Obtaining an action signal of a controlled load;

[0077] S103: Control the movement of the push rod 33 according to the first displacement signal of the push rod 33 and the action signal of the controlled load to drive the main valve core 2 to move, adjust the flow between the liquid inlet 11 and the main valve core core hole 22 of the main valve core 2, and then adjust the action parameters of the controlled load, wherein the action parameters include movement direction and / or movement speed.

[0078] The controlled load may be a hydraulic actuator. The valve controller may send a control signal to the driving mechanism 8 of the push rod 33 through a digital pulse signal generator, drive the driving mechanism 8 to move (for example, drive the electric push rod to telescope), and then drive the push rod 33 to move, drive the main valve core 2 to move with the push rod 33, control the flow between the liquid inlet 11 and the main valve core hole 22 of the main valve core 2, and drive the hydraulic actuator to perform corresponding actions. During the operation of the hydraulic actuator, the valve controller may receive the first displacement signal of the push rod 33 fed back by the driving mechanism 8, and the second displacement signal (stroke feedback) of the hydraulic actuator in real time, and may also receive the flow signal of the water-based proportional reversing valve. The valve controller may further drive the electric push rod to telescope according to the above-mentioned first displacement signal, second displacement signal and flow signal, and adjust the flow between the main valve core hole 22 of the main valve core 2, so as to dynamically adjust the movement direction, movement speed, etc. of the hydraulic actuator during the movement of the hydraulic actuator.

[0079] The control method of the spool-following water-based proportional reversing valve provided in the embodiment of the present disclosure corresponds to the spool-following water-based proportional reversing valve in the above-mentioned embodiment. Any optional items in the embodiment of the spool-following water-based proportional reversing valve are also applicable to the embodiment of the control method of the spool-following water-based proportional reversing valve, which will not be repeated here.

[0080] The above description is only a preferred embodiment of the present disclosure and an explanation of the technical principles used. Those skilled in the art should understand that the scope of disclosure involved in the present disclosure is not limited to the technical solutions formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above disclosed concept. For example, the above features are replaced with the technical features with similar functions disclosed in the present disclosure (but not limited to) by each other to form a technical solution.

[0081] In addition, although each operation is described in a specific order, this should not be understood as requiring these operations to be performed in the specific order shown or in a sequential order. Under certain circumstances, multitasking and parallel processing may be advantageous. Similarly, although some specific implementation details are included in the above discussion, these should not be interpreted as limiting the scope of the present disclosure. Some features described in the context of a separate embodiment can also be implemented in a single embodiment in combination. On the contrary, the various features described in the context of a single embodiment can also be implemented in multiple embodiments individually or in any suitable sub-combination mode.

[0082] Although the subject matter has been described in language specific to structural features and / or methodological logical actions, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. On the contrary, the specific features and actions described above are merely example forms of implementing the claims.

Claims

1. A valve core follower type water-based proportional reversing valve, characterized in that: include: A valve body, wherein the valve body is provided with a liquid inlet and a liquid return port; A main valve core is movably disposed in the valve body and connected with the valve body to form a main valve core control chamber; A pilot valve assembly is arranged in the valve body, comprising a pilot valve core, a ball and a push rod, wherein the pilot valve core is installed on one side of the main valve core, the pilot valve core has a liquid passage cavity communicated with the liquid inlet, the liquid passage cavity is communicated with the main valve core control cavity, the main valve core control cavity is connected with the liquid return port, the ball is movably installed in the liquid passage cavity, one end of the ball is connected to the pilot valve core through a first elastic member, and the other end of the ball is connected to the push rod; The push rod is subjected to force that can act on the ball to control the connection state of the liquid passage cavity, thereby adjusting the pressure of the main valve core control cavity and pushing the main valve core to move with the push rod.

2. The valve core follower type water-based proportional reversing valve according to claim 1, characterized in that: The pilot valve core is embedded in one end of the main valve core, and a first flow channel is provided between the main valve core and the pilot valve core. A ball seat for mounting the ball is arranged in the liquid passage chamber, and a second flow channel is arranged between the ball seat and the liquid passage chamber.

3. The valve core follower type water-based proportional reversing valve according to claim 2, characterized in that: The valve core follower type water-based proportional reversing valve also includes a main valve sleeve, which is movably arranged in the valve body, the main valve sleeve is connected to the valve body to form a main valve sleeve control chamber, the main valve sleeve is connected to the main valve core to form the main valve core control chamber, and the main valve sleeve control chamber is connected to the main valve core control chamber.

4. The valve core follower type water-based proportional reversing valve according to claim 3 is characterized in that: The main valve core is connected to the main valve sleeve from a first end of the main valve sleeve, and the push rod extends into the main valve sleeve from a second end of the main valve sleeve. The main valve sleeve is provided with a pilot valve return liquid chamber connected to the return liquid port, and a third flow channel is provided between the push rod and the main valve sleeve, one end of the third flow channel is connected to the main valve core control chamber, and the other end of the third flow channel is connected to the pilot valve return liquid chamber.

5. The valve core follower type water-based proportional reversing valve according to claim 4, characterized in that: A flow cross section of the second flow channel is larger than a flow cross section of the third flow channel.

6. The valve core follower type water-based proportional reversing valve according to claim 1, characterized in that: The main valve core is provided with a first damping hole communicating with the liquid inlet and the liquid passage chamber. The first damping hole is arranged close to the liquid inlet along the radial direction of the main valve core, a liquid inlet channel is arranged between the first damping hole and the liquid passage chamber, and the liquid inlet channel is arranged along the axial direction of the main valve core.

7. The valve core follower type water-based proportional reversing valve according to claim 3, characterized in that: The main valve sleeve is provided with a second damping hole communicating with the main valve sleeve control chamber and the main valve core control chamber, and the second damping hole is arranged along the axial direction of the main valve sleeve.

8. The valve core follower type water-based proportional reversing valve according to claim 3, characterized in that: The main valve sleeve is also provided with a third damping hole communicating with the pilot valve liquid return cavity and the liquid return port.

9. The valve core follower type water-based proportional reversing valve according to claim 8, characterized in that: A gap is provided between the main valve sleeve and the valve body to form a liquid return channel communicating with the liquid return port and the third damping hole.

10. A control method for a valve core follower type water-based proportional reversing valve, characterized in that: A valve controller applied to a valve core follower type water-based proportional reversing valve according to any one of claims 1 to 9, the method comprising: Acquiring a first displacement signal of the push rod; Obtain the action signal of the controlled load; The movement of the push rod is controlled according to the first displacement signal of the push rod and the action signal of the controlled load to drive the movement of the main valve core, adjust the flow between the liquid inlet and the main valve core core hole of the main valve core, and then adjust the action parameters of the controlled load, wherein the action parameters include movement direction and / or movement speed.

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