Electro-hydraulic control reversing main valve and electro-hydraulic control reversing valve

Abstract

The invention provides an electro-hydraulic control reversing main valve and an electro-hydraulic control reversing valve.The electro-hydraulic control reversing main valve comprises a valve body and a plurality of valve element structures arranged in the valve body, the valve element structures are arranged in the first direction, and each valve element structure is provided with a first liquid inlet, a first liquid return opening and a first working opening; the valve element structure comprises a valve sleeve assembly and a movable valve element assembly, and a protruding part is arranged on the inner side of the valve sleeve assembly so as to be matched with the valve element assembly to block the first liquid inlet or the first liquid return opening. The protruding part is arranged on the inner side of the valve sleeve assembly and matched with the valve element assembly to form the sealing structure, the first liquid inlet or the first liquid return opening is blocked through the sealing structure, on the premise that the through flow of the valve element assembly is guaranteed, the outer diameter of the valve sleeve assembly can be reduced, then the thickness of the valve body is reduced, and the valve is effectively applied to the working condition of a thin coal seam; the coal seam mining is more thorough.

Description

Technical Field

[0001] This disclosure relates to the field of valve technology, and in particular to an electro-hydraulic directional control main valve and an electro-hydraulic directional control valve. Background Technology

[0002] Because of the relatively small mining space, it is difficult to install high-power, high-speed propulsion equipment in thin coal seam mining faces. The stability and reliability of the equipment are mutually constrained by the working space. General-purpose intelligent equipment and systems are not well-suited to the mining requirements due to their size and functional settings, resulting in low output, low efficiency and high labor intensity in this part of the coal seam.

[0003] Typically, in fully mechanized longwall mining faces with thin coal seams, the associated electro-hydraulic directional valves are usually suspended on the top beam of the hydraulic support and installed between the two column cylinders. The existing electro-hydraulic directional valves are generally too thick, preventing the hydraulic support from being lowered to its lowest point during thin coal seam mining operations. This limits the effective mining of some extremely thin coal seams. Summary of the Invention

[0004] This disclosure aims to at least solve the technical problem that the thickness of the electro-hydraulic directional main valve in the prior art is generally too thick, which prevents the hydraulic support from being lowered to the lowest point in thin coal seam mining conditions, thus limiting the effective mining of some extremely thin coal seams.

[0005] Therefore, one objective of this disclosure is to provide an electro-hydraulic directional control main valve, including a valve body and a plurality of valve core structures disposed within the valve body. The valve core structures are arranged along a first direction and are provided with a first inlet, a first return port and a first working port. The valve core structure includes a valve sleeve assembly and a movable valve core assembly. The inner side of the valve sleeve assembly is provided with a protrusion to cooperate with the valve core assembly to block the first inlet or the first return port.

[0006] In some embodiments, the valve sleeve assembly includes a first valve sleeve and a second valve sleeve, the first valve sleeve and the second valve sleeve are mated together, the protrusion is disposed on the inner side of the first valve sleeve or the second valve sleeve, the first liquid inlet is disposed on the first valve sleeve, and the first liquid return outlet is disposed on the second valve sleeve.

[0007] In some embodiments, the end of the first valve sleeve has an extension, the end of the second valve sleeve has a snap-fit ​​portion that engages with the extension, and the protrusion is provided on the inner side of the extension.

[0008] In some embodiments, the valve core assembly includes a first valve core and a second valve core, the first valve core being disposed outside the second valve core, the second valve core having a stepped portion extending outward from its outer periphery, a spring being disposed between the stepped portion and the valve body, and the first working port being disposed on the outer periphery of the second valve core.

[0009] In some embodiments, the protrusion includes a first sealing portion and a third sealing portion, the outer periphery of the second valve core is provided with a second sealing portion that cooperates with the first sealing portion, and the outer periphery of the first valve core is provided with a fourth sealing portion that cooperates with the third sealing portion.

[0010] In some embodiments, the protrusion, the first sealing portion, the second sealing portion, the third sealing portion, and the fourth sealing portion are metal structures.

[0011] In some embodiments, one end of the valve body is provided with a second liquid inlet, a second liquid return outlet and a plurality of second working ports. The second liquid inlet is connected to a liquid source and a first liquid inlet, the second liquid return outlet is connected to a liquid return tank and a first liquid return outlet, and the second working ports are connected to the first working port and an actuator.

[0012] In some embodiments, a control cavity is formed between the first valve core and the second valve sleeve at the ends away from the second working port.

[0013] One object of this disclosure is to provide an electro-hydraulic directional valve, including the aforementioned electro-hydraulic directional main valve, wherein the electro-hydraulic directional valve further includes an electromagnetic pilot valve, the electromagnetic pilot valve being disposed at the end of the valve body and arranged sequentially with the electromagnetic pilot valve along a first direction.

[0014] In some embodiments, the valve core structure is provided with at least two rows spaced apart along a second direction, wherein the first direction and the second direction are perpendicular to each other.

[0015] This disclosure provides an electro-hydraulic controlled directional valve and an electro-hydraulic controlled directional valve, which have the following characteristics:

[0016] Beneficial effects:

[0017] The electro-hydraulic directional valve of this embodiment has a protrusion on the inner side of the valve sleeve assembly that cooperates with the valve core assembly to form a sealing structure. By sealing the first inlet or the first return port, the outer diameter of the valve sleeve assembly can be reduced while ensuring the flow rate of the valve core assembly, thereby reducing the thickness of the valve body. This makes it effective in thin coal seam conditions, and the coal seam mining is more thorough.

[0018] The electro-hydraulic directional valve of this embodiment reduces the overall thickness of the electro-hydraulic directional valve by sequentially arranging the electro-hydraulic directional main valve and the electromagnetic pilot valve along a first direction (the length direction of the valve body).

[0019] The valve core assembly inside the valve body is set along the first direction. The thickness of the valve body is not limited by the length of the valve core assembly, so the thickness of the valve body can be set to be thinner. At the same time, when the liquid flows between the actuator and the valve core assembly, the flow path is straight without bending, and the liquid flow is smoother and more stable. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of the hydraulic support in the embodiments of this disclosure;

[0022] Figure 2 This is a hydraulic schematic diagram of the electro-hydraulic directional valve in the embodiments of this disclosure;

[0023] Figure 3 This is a perspective view of the electro-hydraulic directional valve in the embodiments of this disclosure;

[0024] Figure 4 This is a cross-sectional view of the electro-hydraulic directional control main valve in an embodiment of this disclosure;

[0025] Figure 5 This is a cross-sectional view of the valve core structure in an embodiment of this disclosure;

[0026] Figure 6 This is an embodiment of the present disclosure. Figure 5 A magnified view of a portion of the image.

[0027] Figure label:

[0028] 1. Valve body; 11. Second inlet; 12. Second return port; 13. Second working port; 14. Valve cavity; 15. Control cavity; 151. Pilot hole; 2. Valve core structure; 21. First inlet; 22. First return port; 23. First working port; 24. First flow channel; 25. Second flow channel; 26. Valve sleeve assembly; 261. First valve sleeve; 262. Second valve sleeve; 263. Extension; 264. Snap-fit ​​part; 27. Valve core assembly; 2 71. First valve core; 2711. Fourth sealing part; 272. Second valve core; 2721. Second sealing part; 273. Stepped part; 274. Spring seat; 275. Spring; 28. Protrusion; 281. First sealing part; 282. Third sealing part; 3. Solenoid pilot valve; 4. First check valve; 5. Second check valve; 6. Filter; 7. Solenoid actuator; 100. Hydraulic support; 101. Support top beam; 200. Support cylinder. Detailed Implementation

[0029] Various embodiments and features of this disclosure are described herein with reference to the accompanying drawings.

[0030] It should be understood that various modifications can be made to the embodiments described herein. Therefore, the above description should not be considered as limiting, but merely as an example of embodiments. Other modifications within the scope and spirit of this disclosure will be apparent to those skilled in the art.

[0031] The accompanying drawings, which are included in and form part of this specification, illustrate embodiments of the present disclosure and, together with the general description of the disclosure given above and the detailed description of the embodiments given below, serve to explain the principles of the disclosure.

[0032] These and other features of this disclosure will become apparent from the following description of preferred forms of embodiments given as non-limiting examples, with reference to the accompanying drawings.

[0033] It should also be understood that although this disclosure has been described with reference to some specific examples, those skilled in the art can certainly implement many other equivalent forms of this disclosure, which have the features described in the claims and are therefore all within the scope of protection defined herein.

[0034] The above and other aspects, features and advantages of this disclosure will become more apparent when taken in conjunction with the accompanying drawings and in view of the following detailed description.

[0035] Specific embodiments of this disclosure are described thereafter with reference to the accompanying drawings; however, it should be understood that the claimed embodiments are merely examples of this disclosure, which may be implemented in various ways. Well-known and / or repeated functions and structures are not described in detail to avoid unnecessary or redundant details that could obscure this disclosure. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but merely to serve as the basis and representative basis for the claims to teach those skilled in the art to use this disclosure in a variety of substantially any suitable detailed structures.

[0036] The first embodiment of this disclosure provides an electro-hydraulic directional valve, such as Figures 1-3 As shown, the electro-hydraulic directional valve is installed below the support top beam 101 between two adjacent support cylinders 200 in the coal mining hydraulic system. The electro-hydraulic directional valve is used to control the movement of actuators (e.g., working cylinders). The electro-hydraulic directional valve includes an electro-hydraulic directional main valve and a solenoid pilot valve 3. One solenoid pilot valve 3 and one electro-hydraulic directional main valve form a functional output group. Each functional output group corresponds to controlling an actuator in the hydraulic support 100 to implement an action command. Each functional output group is independent of each other and can simultaneously supply fluid to the actuator, thereby controlling the actuator to move simultaneously. The solenoid pilot valve 3 is located at the end of the valve body 1 of the electro-hydraulic directional main valve and is sequentially connected to the solenoid pilot valve 3 along a first direction, which refers to the length direction of the valve body 1. Compared to the electro-hydraulic directional main valve and the solenoid pilot valve being arranged side-by-side along the height direction, the electro-hydraulic directional valve is thinner in the height direction. During thin coal seam mining, the hydraulic support 100 can be lowered to the bottom of its working range, which is beneficial for application in thin coal seam conditions and makes coal seam mining more thorough.

[0037] In this embodiment, a plurality of valve core structures 2 are provided inside the valve body 1. The valve core structures 2 are arranged in at least two rows spaced apart along a second direction, which is perpendicular to the first direction and refers to the width direction of the valve body 1. If a single row of valve core structures 2 is provided, the width of the valve body 1 will increase exponentially. Compared to providing one row of valve core structures 2 along the width direction of the valve body 1, providing two rows of valve core structures 2 along the width direction of the valve body 1 with the same number of valve core structures 2 can effectively reduce the width of the valve body 1, minimizing the width of the valve body 1 under the condition of compressing thickness. The valve core structures 2 can also be arranged in multiple rows, for example, three rows spaced apart along the second direction. By optimizing the layout of the electro-hydraulic directional valve and the solenoid pilot valve 3, the electro-hydraulic directional valve and the solenoid pilot valve 3 are connected sequentially along the length of the valve body 1 to reduce the height of the electro-hydraulic directional valve. The valve core structure 2 is provided with multiple rows spaced apart on the valve body 1 to reduce the width of the electro-hydraulic directional valve. A compromise is achieved in the height and width of the electro-hydraulic directional valve, which is beneficial for installing the electro-hydraulic directional valve in the narrow space of the hydraulic support to adapt to the confined working environment during thin coal seam mining.

[0038] like Figure 2 As shown, the electromagnetic pilot valve 3 is equipped with a first check valve 4, a second check valve 5, and a filter 6. The first check valve 4 is located in the inlet line of the electromagnetic pilot valve 3, and the second check valve 5 is located in the return line of the electromagnetic pilot valve 3. The first check valve 4 and the second check valve 5 are used to prevent the system oil from entering the circuit of the electromagnetic pilot valve 3 and causing adverse effects on it.

[0039] Furthermore, valve core structure 2 is a normally closed two-position three-way directional valve used to control the action of the actuator. The solenoid valve actuator 7 is mounted on the end of the valve body 1 by screws. The solenoid pilot valve 3 is a dual-position normally closed two-position three-way directional valve used to control the opening or closing of valve core structure 2. The solenoid valve actuator 7 can supply power to the solenoid pilot valve 3.

[0040] The second embodiment of this disclosure provides an electro-hydraulic directional control main valve, such as Figures 3-6As shown, the device includes a valve body 1, within which a valve cavity 14 is provided. Multiple valve core structures 2 are disposed within the valve cavity 14. One end of the valve body 1 is provided with a second inlet 11, a second return port 12, and multiple second working ports 13. The second inlet 11 is connected to a liquid source to supply liquid to the multiple valve core structures 2 respectively. The multiple second working ports 13 are respectively connected to actuators, with one second working port 13 corresponding to one actuator. For example, the second working port 13 is connected to the rod-side or rodless side of a working cylinder, thereby controlling the action of the actuator. An electromagnetic pilot valve 3 acts as a control switch to open or close the valve core structures 2, controlling the flow of liquid from the second inlet 11 to the valve core structures 2, thereby controlling the function output group to supply liquid to the actuators. The return liquid from the valve core structures 2 and the electromagnetic pilot valve 3 converges at the second return port 12 and connects to a return tank. The second inlet 11, the second return port 12, and multiple second working ports 13 are located on the same side of the valve body 1. In coal mining conditions, this facilitates pipeline installation, improves installation efficiency, and reduces the overall space occupied by the electro-hydraulic directional valve and its connecting pipelines.

[0041] In this embodiment, as Figure 4 and Figure 5 As shown, the valve core structure 2 is provided with a first inlet 21, a first return port 22, and a first working port 23. The first inlet 21 and the second inlet 11 are connected by a first flow channel 24, and the first return port 22 and the second return port 12 are connected by a second flow channel 25. Here, the first flow channel 24 and the second flow channel 25 are respectively arranged between the two rows of valve core structures 2, and the liquid from the second inlet 11 can enter both rows of valve core structures 2 simultaneously after passing through the first flow channel 24. This arrangement makes more efficient use of space, reduces the thickness of the valve body 1, and is suitable for use in thin coal seam mining.

[0042] In this embodiment, the valve core structure 2 is arranged along the length direction of the valve body 1. Compared with the valve core structure 2 being arranged along the width direction of the valve body 1, the thickness of the valve body 1 is not limited by the length of the valve core structure 2. Even when the valve core structure 2 is longer, the thickness of the valve body 1 can still be ensured to be thinner.

[0043] Specifically, the valve core structure 2 includes a valve sleeve assembly 26 and a movable valve core assembly 27. The valve sleeve assembly 26 is disposed outside the valve core assembly 27, and the outer side of the valve sleeve assembly 26 is connected to the inner wall of the valve cavity 14. The valve sleeve assembly 26 includes a first valve sleeve 261 and a second valve sleeve 262. The first valve sleeve 261 has an extension 263 at its end, and the second valve sleeve 262 has a snap-fit ​​portion 264 at its end that mates with the extension 263. The first valve sleeve 261 and the second valve sleeve 262 are connected via the extension 263 and the snap-fit ​​portion 264. The snap-fit ​​portion 264 snaps onto the outer periphery of the extension 263, directly connecting the first valve sleeve 261 and the second valve sleeve 262 without the need for an additional connecting structure. The connection between the components facilitates setting the outer diameter of the first valve sleeve 261 and the outer diameter of the second valve sleeve 262 to be the same size. Compared with the first valve sleeve 261 and the second valve sleeve 262 having different outer diameters, the spatial layout of the valve core assembly 27 can be optimized, and the space occupied by the valve core assembly 27 along the radial direction of the valve core structure 2 can be reduced. Since the electro-hydraulic directional valve is provided with multiple valve core structures 2, the reduction in space occupied by multiple valve core structures 2 is superimposed. For the electro-hydraulic directional valve as a whole, its space occupied in both the length and width directions can be effectively reduced.

[0044] In another embodiment, the valve sleeve assembly 26 includes a first valve sleeve 261 and a second valve sleeve 262. The first valve sleeve 261 has a snap-fit ​​portion 264 at its end, and the second valve sleeve 262 has an extension portion 263 at its end that engages with the snap-fit ​​portion 264. The first valve sleeve 261 and the second valve sleeve 262 are connected to each other via the extension portion 263 and the snap-fit ​​portion 264.

[0045] In this embodiment, the valve core assembly 27 includes a first valve core 271 and a second valve core 272. The first valve core 271 is disposed outside the second valve core 272. The length of the second valve core 272 is greater than the length of the first valve core 271. A stepped portion 273 extends outward from the outer periphery of the second valve core 272. A spring seat 274 connected to the second valve sleeve 262 is disposed at the end of the second valve core 272 near the second working port 13. A spring 275 is disposed between the stepped portion 273 and the spring seat 274. The first working port 23 is disposed on the outer periphery of the second valve core 272. The second valve core 272 has a hollow cavity, which communicates with both the first working port 23 and the second working port 13. The hollow cavity allows for faster flow of liquid between the first working port 23 and the second working port 13.

[0046] In this embodiment, as Figure 5 and Figure 6As shown, a protrusion 28 is provided on the inner side of the valve sleeve assembly 26 to cooperate with the valve core assembly 27 to seal the first liquid inlet 21 or the first liquid return port 22. The protrusion 28, located on the inner side of the valve sleeve assembly 26, can reduce the outer diameter of the valve core structure 2, thereby reducing the thickness of the valve body 1.

[0047] Specifically, in this embodiment, the protrusion 28 is disposed on the inner side of the first valve sleeve 261, and is also the inner side of the extension 263. The first liquid inlet 21 is disposed on the first valve sleeve 261, and the first liquid return port 22 is disposed on the second valve sleeve 262. The protrusion 28 includes a first sealing portion 281 and a third sealing portion 282. The outer periphery of the second valve core 272 is provided with a second sealing portion 2721 that cooperates with the first sealing portion 281. The first valve sleeve 261 and the second valve sleeve 262 are made of metal. The first sealing portion 281 and the second sealing portion 2721 contact each other to form a hard seal structure between the first valve sleeve 261 and the second valve core 272, so as to close the first liquid inlet 21 and the first working port 23. The outer periphery or end of the first valve core 271 is provided with a fourth sealing portion 2711 that cooperates with the third sealing portion 282. The third sealing portion 282 and the fourth sealing portion 2711 contact each other to form a hard seal structure between the first valve sleeve 261 and the first valve core 271, so as to close the first liquid return port 22 and the first working port 23.

[0048] Furthermore, the first valve sleeve 261 is designed as a one-piece structure, which achieves sealing with both the first valve core 271 and the second valve core 272 simultaneously by providing a protrusion 28 on its inner side. This eliminates the need for additional sealing elements and optimizes the spatial layout of the sealing structure, reducing its space occupation. Compared to setting additional sealing elements inside the first valve sleeve 261, this method can reduce the diameter of the first valve sleeve 261 without changing the flow diameter of the second valve core 272. When the diameter of the first valve sleeve 261 decreases, the overall diameter of the valve core structure 2 also decreases, enabling the setting of thin coal seams. Furthermore, by placing the stepped portion 273 and the third sealing portion 2721 in one component, the number of parts used is reduced, improving processing and assembly efficiency.

[0049] The first sealing part 281, the second sealing part 2721, the third sealing part 282, and the fourth sealing part 2711 are all sealing slopes to ensure that the first sealing part 281 and the second sealing part 2721 can contact each other, and the third sealing part 282 and the fourth sealing part 2711 can be wedge-tight when they contact each other, thus ensuring a sealing effect.

[0050] Multiple first inlet ports 21 are spaced apart circumferentially along the first valve sleeve 261, multiple first return ports 22 are spaced apart circumferentially along the second valve sleeve 262, and multiple first working ports 23 are spaced apart circumferentially along the second valve core 272, ensuring a relatively fast liquid flow rate. An annular flow channel is formed between the first valve sleeve 261 and the valve body 1, and between the second valve sleeve 262 and the valve body 1. The water flowing into this annular flow channel acts as a buffer, ensuring that the liquid entering the first inlet port 21 and the second inlet port 11 is smooth and continuous.

[0051] Further, a control cavity 15 is formed between the ends of the first valve core 271 and the second valve sleeve 262 away from the second working port 13, and the control cavity 15 is connected to the electromagnetic pilot valve 3. Specifically, the end of the first valve core 271 near the first valve sleeve 261 and the second valve sleeve 262 form the control cavity 15, and the outer periphery of the second valve sleeve 262 is provided with a pilot hole 151 communicating with the electromagnetic pilot valve. The electromagnetic pilot valve 3 sends pilot liquid from the pilot hole 151 into the control cavity 15 or collects the pilot liquid in the control cavity 15 into the return tank, controlling the opening or closing of the valve core structure 2. The electromagnetic pilot valve 3 controls the valve core structure 2 to switch between a first working state and a second working state.

[0052] Specifically, in the first operating state, high-pressure liquid is introduced into the control chamber 15 through the pilot hole 151. One end of the first valve core 271 moves to the right (near the end closer to the second working port 12) under the action of the high-pressure liquid. The third sealing part 282 and the fourth sealing part 2711 come into contact with each other, blocking the first return port 22 and the first working port 23. Subsequently, one end of the second valve core 272 moves to the right (near the end closer to the second working port 12) after overcoming the spring force of the spring 275 under the action of the high-pressure liquid. The first sealing part 281 and the second sealing part 2721 separate from each other, connecting the first inlet port 21 and the first working port 23.

[0053] Furthermore, in the second working state, the high-pressure liquid in the control chamber 15 is discharged, the pressure on the left side of the first valve core 271 is less than the pressure on its right side, the first valve core 271 moves to the left, the third sealing part 282 and the fourth sealing part 2711 separate from each other, connecting the first return port 22 and the first working port 23; subsequently, the spring 275 extends, driving the second valve core 272 to move to the left, the first sealing part 281 and the second sealing part 2721 come into contact with each other, connecting the first inlet port 21 and the first working port 23.

[0054] The third embodiment of this disclosure provides a hydraulic system including a hydraulic support 100 and the aforementioned electro-hydraulic directional valve, wherein the electro-hydraulic directional valve is disposed below the support top beam 101 between two adjacent support cylinders 200 of the hydraulic support 100.

[0055] This embodiment of the disclosure reduces the thickness of the entire electro-hydraulic directional valve by sequentially arranging the electro-hydraulic directional main valve and the electromagnetic pilot valve along the first direction (the length direction of the valve body 1).

[0056] By setting the valve core assembly 27 inside the valve body 1 along the first direction, the thickness of the valve body 1 is not limited by the length of the valve core assembly 27, and the thickness of the valve body 1 can be set to be thinner. At the same time, when the liquid flows between the actuator and the valve core assembly 27, the flow path is straight without bending, and the liquid flow is smoother and more stable.

[0057] In this embodiment, a protrusion 28 is provided on the inner side of the valve sleeve assembly 26, which cooperates with the valve core assembly 27 to form a sealing structure. By sealing the first liquid inlet 21 or the first liquid return port 22, the outer diameter of the valve sleeve assembly 26 can be reduced while ensuring the flow rate of the valve core assembly 27, thereby reducing the thickness of the valve body 1. This is effectively applied in thin coal seam conditions, making coal seam mining more thorough.

[0058] In the description of this disclosure, 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," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0059] In the description of this disclosure, "first feature" and "second feature" may include one or more of the features.

[0060] In the description of this disclosure, "multiple" means two or more.

[0061] In the description of this disclosure, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0062] In the description of this disclosure, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature.

[0063] In the description of this disclosure, references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0064] Although embodiments of this disclosure have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this disclosure, the scope of which is defined by the claims and their equivalents.

Claims

1. An electro-hydraulic controlled reversing main valve, characterized in that: It includes a valve body and multiple valve core structures arranged in the valve body, the valve core structure is arranged along a first direction, a first liquid inlet, a first liquid return port and a first working port are arranged on the valve core structure, the valve core structure includes a valve sleeve assembly and a movable valve core assembly, and a protrusion is arranged on the inner side of the valve sleeve assembly to cooperate with the valve core assembly to seal the first liquid inlet or the first liquid return port.

2. The electro-hydraulic controlled directional main valve according to claim 1, characterized in that: The valve sleeve assembly includes a first valve sleeve and a second valve sleeve, the first valve sleeve and the second valve sleeve are connected to each other, the protrusion is arranged on the inner side of the first valve sleeve or the second valve sleeve, the first liquid inlet is arranged on the first valve sleeve, and the first liquid return port is arranged on the second valve sleeve.

3. The electro-hydraulic controlled directional main valve according to claim 2, characterized in that: The end of the first valve sleeve has an extension portion, the end of the second valve sleeve has a clamping portion matched with the extension portion, and the protrusion is arranged on the inner side of the extension portion.

4. The electro-hydraulic controlled directional main valve according to claim 3, characterized in that: The valve core assembly includes a first valve core and a second valve core. The first valve core is arranged on the outside of the second valve core. A step portion extends outward from the outer periphery of the second valve core. A spring is arranged between the step portion and the valve body. The first working port is arranged on the outer periphery of the second valve core.

5. The electro-hydraulic controlled directional main valve according to claim 4, characterized in that: The protruding portion includes a first sealing portion and a third sealing portion, the second valve core is provided with a second sealing portion cooperating with the first sealing portion on its outer periphery, and the first valve core is provided with a fourth sealing portion cooperating with the third sealing portion on its outer periphery.

6. The electro-hydraulic controlled directional main valve according to claim 5, characterized in that: The protruding portion, the first sealing portion, the second sealing portion, the third sealing portion and the fourth sealing portion are metal structures.

7. The electro-hydraulic controlled directional main valve according to claim 4, characterized in that: A second liquid inlet, a second liquid return port and a plurality of second working ports are provided at one end of the valve body, the second liquid inlet is respectively connected to the liquid source and the first liquid inlet, the second liquid return port is respectively connected to the liquid return tank and the first liquid return port, and the second working ports are respectively connected to the first working port and the actuator.

8. The electro-hydraulic controlled directional main valve according to claim 7, characterized in that: A control chamber is formed between the first valve core and an end of the second valve sleeve away from the second working port.

9. An electro-hydraulic controlled reversing valve, characterized in that: It comprises the electro-hydraulic controlled reversing main valve according to any one of claims 1 to 8, wherein the electro-hydraulic controlled reversing valve further comprises an electromagnetic pilot valve, wherein the electromagnetic pilot valve is arranged at the end of the valve body and is arranged in sequence with the electromagnetic pilot valve along a first direction.

10. The electro-hydraulic controlled reversing valve according to claim 9, characterized in that: The valve core structures are arranged in at least two rows at intervals along a second direction, and the first direction is perpendicular to the second direction.

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