Electro-hydraulic control reversing main valve and pilot-operated reversing valve

Abstract

The invention provides an electro-hydraulic control reversing main valve and a pilot-operated type electro-hydraulic control reversing valve.The electro-hydraulic control reversing main valve comprises a main valve body and a valve element structure arranged in the main valve body, the valve element structure comprises a valve sleeve assembly and a valve element assembly, and the valve sleeve assembly is arranged on the outer side of the valve element assembly; a first valve seat is arranged at one end of the valve sleeve assembly, the valve element assembly comprises a first valve element and a second valve element, the first valve element is arranged on the outer side of the second valve element, and a first stopping piece is arranged on the periphery of the end, penetrating through the first valve seat, of the second valve element. According to the electro-hydraulic control reversing main valve, the first stop piece is arranged, when the valve element structure needs to be detached from the main valve body during maintenance of the electro-hydraulic control reversing main valve, the first stop piece blocks relative movement between the valve sleeve assembly and the valve element assembly in the detaching direction, the whole valve element structure can be detached from the main valve body at a time, secondary operation is not needed, detaching is more convenient, and the detaching efficiency is improved. The maintenance workload is reduced, and the working efficiency is improved.

Description

Technical Field

[0001] The present disclosure relates to the field of valve technology, and in particular to an electro-hydraulic controlled directional control main valve and a pilot-operated directional control valve. Background Art

[0002] The electro-hydraulic controlled reversing main valve comprises a main valve body and a valve core structure arranged in the main valve body. The valve core structure is generally a split structure. When maintaining the electro-hydraulic controlled reversing main valve, the pipeline connected to the valve core structure on the main valve body is firstly removed, and then the valve core structure is removed from the main valve body. However, since the valve core structure is a split structure, it is difficult to remove the entire valve core structure from the main valve body in one operation. Some parts of the valve core structure will remain in the main valve body, which need to be removed for a second time. The maintenance workload is large and the efficiency is low. Summary of the invention

[0003] The present disclosure aims to at least solve the technical problem in the prior art that the valve core structure is a split structure and it is difficult to remove the entire valve core structure during a single operation, resulting in a large maintenance workload and low efficiency when maintaining the electro-hydraulic controlled reversing main valve.

[0004] To this end, one purpose of the present disclosure is to propose an electro-hydraulic controlled reversing main valve, comprising a main valve body and a valve core structure arranged in the main valve body, the valve core structure comprising a valve sleeve assembly and a valve core assembly, the valve sleeve assembly is arranged on the outside of the valve core assembly, a first valve seat is arranged at one end of the valve sleeve assembly, the valve core assembly comprises a first valve core and a second valve core, the first valve core is arranged on the outside of the second valve core, and a first stopper is arranged on the outer periphery of one end of the second valve core passing through the first valve seat.

[0005] 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 butted against each other and are interference fit, and the first valve sleeve and the first valve seat are interference fit.

[0006] In some embodiments, the end of the first valve sleeve has an extension portion, the end of the second valve sleeve has a clamping portion, the extension portion is connected to the clamping portion to form a first sealing groove therebetween, and a first sealing member is disposed in the first sealing groove.

[0007] In some embodiments, a second valve seat is disposed at the other end of the valve sleeve assembly, the second valve seat is connected to the main valve body via threads, and the second valve seat is connected to an end portion of the second valve sleeve.

[0008] In some embodiments, a second stopper is disposed between the second valve seat and the second valve sleeve.

[0009] In some embodiments, the second valve core has a step portion extending radially outward, a spring is arranged between the step portion and the first valve seat, a second sealing groove and a third sealing groove are respectively arranged on the inner and outer sides of the first valve seat, a second sealing member is arranged in the second sealing groove, and a third sealing member is arranged in the third sealing groove.

[0010] In some embodiments, a first liquid inlet is provided on the first valve sleeve, a first liquid return port is provided on the second valve sleeve, a first working port is provided on the second valve core, a second liquid inlet connected to a liquid source, a second liquid return port connected to a liquid return tank, and a plurality of second working ports are provided at one end of the main valve body, the second liquid inlet is communicated with the first liquid inlet, the second liquid return port is communicated with the first liquid return port, and the second working port is communicated with the first working port.

[0011] In some embodiments, one end of the first valve core close to the second valve seat forms a control chamber with the first valve sleeve, a pilot hole is arranged on the periphery of the first valve sleeve, and the control chamber is connected to the electromagnetic pilot valve through the pilot hole.

[0012] Another object of the present disclosure is to provide a pilot-operated electro-hydraulic controlled reversing valve, comprising the above-mentioned electro-hydraulic controlled reversing main valve, wherein the pilot-operated electro-hydraulic controlled reversing valve also includes an electromagnetic pilot valve, which is arranged at the end of the main valve body and is arranged in sequence with the electromagnetic pilot valve along a first direction.

[0013] In some embodiments, the electromagnetic pilot valve includes a pilot valve body, and a third liquid inlet, a third liquid return port and multiple third working ports are arranged at one end of the pilot valve body close to the main valve body, and the third liquid inlet, the third liquid return port and the third working ports are arranged in the same row.

[0014] In some embodiments, the valve core structure is arranged along a first direction.

[0015] In some embodiments, the valve core structure and the pilot valve body are arranged correspondingly.

[0016] The electro-hydraulic controlled directional main valve and the pilot electro-hydraulic controlled directional valve provided in the embodiments of the present disclosure have the following beneficial effects:

[0017] The valve core structure of the electro-hydraulic controlled reversing main valve includes a valve sleeve assembly and a valve core assembly. The first valve sleeve and the second valve sleeve of the valve sleeve assembly are connected to each other. A first stopper is arranged on the outer periphery of one end of the second valve core of the valve core assembly passing through the first valve seat. When the valve core structure needs to be removed from the main valve body for maintenance of the electro-hydraulic controlled reversing main valve, the first stopper hinders the relative movement between the valve sleeve assembly and the valve core assembly along the removal direction. The valve core structure can be removed from the main valve body as a whole at one time without the need for secondary operation. The disassembly is more convenient, the maintenance workload is reduced, and the work efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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.

[0019] Figure 1 is a three-dimensional diagram of an electro-hydraulic controlled reversing main valve in an embodiment of the present disclosure;

[0020] Figure 2 is a three-dimensional diagram of the valve core structure in the embodiment of the present disclosure;

[0021] Figure 3 is a partial enlarged view of the valve core structure in the embodiment of the present disclosure;

[0022] Figure 4 is a three-dimensional diagram of a pilot-operated electro-hydraulic controlled directional valve in an embodiment of the present disclosure;

[0023] Figure 5 is a three-dimensional diagram of a solenoid pilot valve in an embodiment of the present disclosure;

[0024] Figure 6 is a side view of the electromagnetic pilot valve in the embodiment of the present disclosure;

[0025] Figure 7 It is a schematic diagram of the structure of the hydraulic support in the embodiment of the present disclosure.

[0026] Reference numerals:

[0027] 1. Main valve body; 11. Second liquid inlet; 12. Second liquid return port; 13. Second working port; 2. Valve cavity; 3. Valve core structure; 31. Second valve seat; 32. Valve sleeve assembly; 321. First valve sleeve; 3211. Extension; 3212. First sealing member; 322. Second valve sleeve; 3221. Connecting portion; 3222. Third stopper; 3223. Second stopper; 3224. Clamping portion; 3225. First sealing slope; 3226. Third sealing slope; 323. First liquid inlet; 324. First liquid return port; 325. First working port; 3 3. Valve core assembly; 331. First valve core; 3311. Fourth sealing slope; 332. Second valve core; 3321. Second sealing slope; 3322. Step portion; 333. First stopper; 34. First valve seat; 341. Second sealing member; 342. Third sealing member; 35. Fourth sealing member; 36. Spring; 4. Control chamber; 5. Solenoid pilot valve; 51. Pilot valve body; 52. Electromagnet; 53. Pilot valve core; 54. Third liquid inlet; 55. Third liquid return port; 56. Third working port; 57. Lever; 6. Hydraulic support; 7. Support cylinder. DETAILED DESCRIPTION

[0028] Various aspects and features of the present disclosure are described herein with reference to the drawings.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] The first embodiment of the present disclosure provides an electro-hydraulic controlled directional control main valve, such as Figure 1-Figure 3 As shown, the electro-hydraulic controlled reversing main valve includes a main valve body 1, a valve cavity 2 is arranged in the main valve body 1, a valve core structure 3 is arranged in the valve cavity 2, a second liquid inlet 11, a second liquid return port 12 and a plurality of second working ports 13 are arranged on one side of the main valve body 1, the second liquid inlet 11 is connected to a liquid source to supply liquid to the plurality of valve core structures 3 respectively, the second liquid return port 12 is connected to a liquid return tank, the plurality of second working ports 13 are respectively connected to actuators, and one second working port 13 corresponds to one actuator.

[0036] In this embodiment, if Figure 2 As shown, the valve core structure 3 includes a second valve seat 31, a valve sleeve assembly 32, a valve core assembly 33 and a first valve seat 34, the valve sleeve assembly 32 is arranged on the outside of the valve core assembly 33, and the second valve seat 31 and the first valve seat 34 are respectively arranged at both ends of the valve sleeve assembly 32, wherein the first valve seat 34 is close to the second working port 13.

[0037] Specifically, Figure 2 and Figure 3 As shown, the second valve seat 31, the valve core structure 3 and the first valve seat 34 are arranged in sequence in the valve cavity 2, wherein the valve sleeve assembly 32 includes a first valve sleeve 321 and a second valve sleeve 322, the first valve sleeve 321 is provided with a first liquid inlet 323, and the second valve sleeve 322 is provided with a first liquid return port 324, wherein the first liquid inlet 323 is connected to the second liquid inlet 11, and the first liquid return port 324 is connected to the second liquid return port 12. The second valve sleeve 322 and the second valve seat 31 are set as a split structure, and the second valve seat 31 is threadedly connected to the main valve body 1, so that the part of the valve core structure 3 threadedly connected to the main valve body 1 (the second valve seat 31) and the other parts of the valve core structure 3 (the valve sleeve assembly 32) are divided into two parts that can rotate flexibly with each other. When the valve core structure 3 is pulled out from the main valve body 1, it is only necessary to overcome the thread resistance of the second valve seat 31 and the axial force of the entire valve core structure 3 when screwing, and it is not necessary to overcome the thread resistance of the entire valve core structure 3, so as to prevent the thread resistance from being too large when screwing the second valve seat 31, so that the entire valve core structure 3 cannot be pulled out from the main valve body 1. Through this solution, it is more convenient and quick to remove the electro-hydraulic control reversing main valve from the main valve body 1.

[0038] Furthermore, one end of the second valve sleeve 322 has a connecting portion 3221 connected to the second valve seat 31, and a third stopper 3222 is arranged on the outer periphery of the end of the connecting portion 3221 extending into the second valve seat 31, wherein the diameter of the connecting portion 3221 is smaller than the diameter of the second valve sleeve 322, and the third stopper 3222 limits the axial freedom of movement of the second valve seat 31 and the second valve sleeve 322, without affecting the rotational freedom of the second valve seat 31 and the second valve sleeve 322. In addition, the second valve seat 31 and the second valve sleeve 322 are arranged as a split structure, and the two can be made of different materials to reduce costs. For example, the second valve seat 31 is made of alloy copper material, and the second valve sleeve 322 is made of metal material. In addition, the third stopper 3222 can be selected as a retaining ring.

[0039] Furthermore, a second stopper 3223 is provided between the second valve seat 31 and the second valve sleeve 322. When the second valve seat 31 and the second valve sleeve 322 rotate relative to each other, the second stopper 3223 can reduce the friction between the second valve seat 31 and the second valve sleeve 322, thereby increasing the service life of the second valve seat 31 and the second valve sleeve 322. A fourth sealing member 35 is provided between the second valve sleeve 322 and the main valve body 1, wherein a plurality of fourth sealing members 35 are provided at intervals along the outer periphery of the second valve sleeve 322 to ensure the sealing performance between the second valve sleeve 322 and the main valve body 1.

[0040] In this embodiment, the first valve sleeve 321 and the second valve sleeve 322 are connected to each other through the extension portion 3211 and the clamping portion 3224, wherein the extension portion 3211 is arranged at the end of the first valve sleeve 321, and the clamping portion 3224 is arranged at the end of the second valve sleeve 322, and the extension portion 3211 and the clamping portion 3224 are interference fit. Connection through interference fit can reduce the use of fasteners such as screws and reduce the number of parts. At the same time, connection through interference fit can avoid the phenomenon of threaded connection being disengaged compared with threaded connection, thereby ensuring the connection strength of the first valve sleeve 321 and the second valve sleeve 322 and improving the connection reliability.

[0041] Further, the extension portion 3211 extends into the clamping portion 3224 and forms a first sealing groove between the clamping portion 3224 and the extension portion 3211. The first sealing member 3212 is arranged in the first sealing groove, which is conducive to ensuring the sealing performance between the joint of the first valve sleeve 321 and the second valve sleeve 322 and the main valve body 1. At the same time, the first sealing groove is arranged between the clamping portion 3224 and the extension portion 3211, and the space of the first sealing groove formed by the extension portion 3211 and the clamping portion 3224 is reasonably used, which is conducive to reducing the diameter of the first valve sleeve 321 and the second valve sleeve 322, thereby reducing the diameter of the valve core structure 3. The first sealing member 3212 here includes a sealing ring and a retaining ring sequentially arranged on the outer periphery of the extension portion 3211.

[0042] In this embodiment, the valve core assembly 33 can move in the valve cavity 2, and the valve core assembly 33 includes a first valve core 331 and a second valve core 332. The first valve core 331 is arranged on the outside of the second valve core 332, and the first working port 325 is arranged on the periphery of the second valve core 332.

[0043] In this embodiment, the first valve sleeve 321 has a first sealing slope 3225 and a third sealing slope 3226 on its inner side, the second valve core 332 is provided with a second sealing slope 3321, and the first valve core 331 has a fourth sealing slope 3311 at one end close to the first valve seat 34, wherein the first sealing slope 3225 and the second sealing slope 3321 cooperate with each other to realize the cutoff of the first liquid inlet 323 and the first working port 325, and the third sealing slope 3226 and the fourth sealing slope 3311 cooperate with each other to realize the cutoff of the first liquid return port 324 and the first working port 325. Here, the first valve sleeve 321, the second valve sleeve 322, the first valve core 331 and the second valve core 332 are made of metal materials, and a hard seal is formed between the first valve sleeve 321 and the first valve core 331, and between the first valve sleeve 321 and the second valve core 332, thereby improving the service life of the valve core structure 3.

[0044] Furthermore, a step portion 3322 is radially extended outwardly from the outer periphery of the second valve core 332, and a spring 36 is provided between the step portion 3322 and the first valve seat 34. Furthermore, the first valve seat 34 and the second valve core 332 are connected by interference fit, which can reduce the use of fasteners such as screws and reduce the number of parts. At the same time, compared with the threaded connection, the connection by interference fit can avoid the stripping phenomenon of the threaded connection, ensure the connection strength of the first valve seat 34 and the second valve core 332, and improve the connection reliability.

[0045] Furthermore, the length of the second valve core 332 is greater than that of the first valve core 331 , one end of the second valve core 332 passes through the first valve seat 34 , and a first stopper 333 is provided around the outer periphery of one end of the second valve core 332 passing through the first valve seat 34 . When the first stopper 333 is not provided, since the first valve sleeve 321 and the second valve sleeve 322 are interference fit instead of being connected by threaded connection or screw connection, when maintaining the reversing main valve, if the first valve sleeve 321 and the second valve sleeve 322 become loose, the valve core structure 3 is directly removed from the main valve body 1, and only the second valve seat 31, the second valve sleeve 322, the first valve core 331 and the second valve core 332 may be removed, while the first valve sleeve 321 and the first valve seat 34 remain in the main valve body 1 due to the looseness between the first valve sleeve 321 and the second valve sleeve 322. After the first stopper 333 is provided, the first valve sleeve 321, the first valve seat 34 and the second valve core 332 form a whole. When maintaining the reversing main valve, even if the first valve sleeve 321 and the second valve sleeve 322 become loose, the main valve core structure 3 can be removed from the main valve body 1 as a whole. At the same time, the portion of the second valve core 332 that passes through one end of the first valve seat 34 has a stopper, which can also prevent the valve core structure 3 from being removed from the valve cavity 2 as a whole.

[0046] Further, the second sealing groove and the third sealing groove are respectively provided on the inner and outer sides of the first valve seat 34, the second sealing groove is provided with a second sealing member 341, and the third sealing member 342 is provided in the third sealing groove. The second sealing member 341 is provided to improve the sealing performance between the first valve seat 34 and the second valve core 332, and the third sealing member 342 improves the sealing performance between the first valve seat 34 and the main valve body 1. Exemplarily, the second sealing member 341 and the third sealing member 342 are respectively composed of a sealing ring and a retaining ring.

[0047] In this embodiment, one end of the first valve core 331 close to the second valve seat 31 forms a control chamber 4 with the second valve sleeve 322, a pilot hole is arranged on the periphery of the second valve sleeve 322, and the control chamber 4 is connected to the electromagnetic pilot valve 5 through the pilot hole. Specifically, the electromagnetic pilot valve 5 controls the opening or closing of the valve core structure 3 by sending the pilot liquid from the pilot hole into the control chamber 4 or collecting the liquid in the control chamber 4 into the return liquid tank, wherein the electromagnetic pilot valve 5 controls the valve core structure 3 to switch between the first working state (open) and the second working state (closed).

[0048] Specifically, in the first working state, high-pressure liquid is introduced into the control chamber 4 from the pilot hole, and one end of the first valve core 331 moves rightward (close to the end of the second working port 13) under the action of the high-pressure liquid, and the third sealing slope 3226 and the fourth sealing slope 3311 contact each other, blocking the first liquid return port 324 and the first working port 325. Subsequently, one end of the second valve core 332 moves rightward (close to the end of the second working port 13) under the action of the high-pressure liquid to overcome the spring force, and the first sealing slope 3225 and the second sealing slope 3321 are separated from each other, connecting the first liquid inlet 323 and the first working port 325.

[0049] Furthermore, in the second working state, the high-pressure liquid in the control chamber 4 is discharged, the pressure on the left side of the first valve core 331 is less than the pressure on the right side thereof, the first valve core 331 moves to the left, the third sealing bevel 3226 and the fourth sealing bevel 3311 separate from each other, connecting the first liquid return port 324 and the first working port 325; then, the spring 36 extends, driving the second valve core 332 to move to the left, the first sealing bevel 3225 and the second sealing bevel 3321 contact each other, connecting the first liquid inlet 323 and the first working port 325.

[0050] The second embodiment of the present disclosure provides a pilot-operated electro-hydraulic controlled directional valve, such as Figure 4-Figure 7 As shown, it includes a solenoid pilot valve 5 and the above-mentioned electro-hydraulic control reversing valve. A solenoid pilot valve 5 and an electro-hydraulic control reversing main valve form a functional output group. Each functional output group corresponds to controlling the actuator in the hydraulic support 6 to realize an action instruction. Each functional output group is independent of each other and can realize simultaneous supply of liquid to the actuator, thereby controlling the actuator to act simultaneously. The solenoid pilot valve 5 is arranged at the end of the main valve body 1 of the electro-hydraulic control reversing main valve and is sequentially connected with the solenoid pilot valve 5 along the first direction. The first direction here refers to the length direction of the main valve body 1. Compared with the valve core structure 3 and the solenoid pilot valve 5 arranged in parallel along the height direction, the electro-hydraulic control reversing valve is thinner in the height direction.

[0051] Furthermore, the valve core structure 3 is arranged along the length direction (first direction) of the main valve body 1. Compared with the case where the valve core structure 3 is arranged along the width direction of the main valve body 1, the thickness of the main valve body 1 is not limited by the length of the valve core structure 3. When the valve core structure 3 is longer, the thickness of the main valve body 1 can also be ensured to be thin.

[0052] Furthermore, the valve core structure 3 is arranged in at least two rows at intervals along the second direction, where the second direction refers to the width direction of the main valve body 1. Two adjacent rows of valve core structures 3 form a group, and the valve core structure 3 and the pilot valve body 51 are arranged correspondingly, that is, one pilot valve body 51 covers one valve cavity 2. When disassembling any one or two of a group of valve core structures 3, it is only necessary to disassemble one solenoid pilot valve 5 to complete the removal, thereby reducing the workload of maintenance.

[0053] Furthermore, if Figure 6 As shown, the electromagnetic pilot valve 5 includes a pilot valve body 51 and an electromagnet 52 connected in sequence, a pilot valve core 53 is arranged in the pilot valve body 51, and a third liquid inlet 54, a third liquid return port 55 and a plurality of third working ports 56 are arranged at one end of the pilot valve body 51 close to the main valve body 1, the third liquid inlet 54 is communicated with the first liquid inlet 323, the third liquid return port 55 is communicated with the first liquid return port 324, and the third working port 56 is communicated with the first working port 325. Here, each electromagnetic pilot valve 5 Two third working ports 56 are provided, corresponding to the two main valve core structures 3 corresponding to the electromagnetic pilot valve 5 respectively. The third liquid inlet 54, the third liquid return port 55 and the third working port 56 are respectively connected with the pilot valve core 53 of the electromagnetic pilot valve 5 through flow channels. The third liquid inlet 54, the third liquid return port 55 and the third working port 56 are arranged in the same row, which is beneficial to optimizing the layout inside the pilot valve body 51 of the electromagnetic pilot valve 5. The arrangement of each flow channel is more compact, and the pilot valve body 51 is set thinner, which is beneficial to use in thin coal seam mining.

[0054] Furthermore, the pilot valve core 53 adopts a hydraulically balanced ball valve structure, and the pilot valve core 53 is connected to the electromagnet 52 through a lever 57. Its working principle is: when the electromagnet 52 is powered off, the third return liquid port 55 is connected to the third working port 56, the third working port 56 is cut off from the third working port 56, the third liquid inlet 54 is cut off from the third return liquid port 55, the electromagnetic pilot valve 5 does not supply liquid to the control chamber 4, the liquid in the control chamber 4 flows back to the return liquid tank, and the electro-hydraulic control reversing main valve is in the second working state; when the electromagnet 52 is powered on, the pilot valve core 53 connects the third working port 56 to the third liquid inlet 54 through the lever 57, the third working port 56 is cut off from the third return liquid port 55, the third liquid inlet 54 is cut off from the third return liquid port 55, the electromagnetic pilot valve 5 passes high-pressure liquid to the control chamber 4, and the electro-hydraulic control reversing main valve switches to the first working state.

[0055] The third embodiment of the present disclosure provides a hydraulic system, including a hydraulic support 6 and the above-mentioned pilot electro-hydraulic controlled reversing valve, wherein the pilot electro-hydraulic controlled reversing valve is arranged below the support top beam between two adjacent support cylinders 7 of the hydraulic support 6.

[0056] The disclosed embodiment reduces the thickness of the entire electro-hydraulic control reversing valve by sequentially arranging the electro-hydraulic control reversing main valve and the electromagnetic pilot valve 5 along the first direction (the length direction of the main valve body 1 ).

[0057] By optimizing the arrangement of the electro-hydraulic controlled reversing valve and the electromagnetic pilot valve 5, one pilot valve body 51 covers one valve chamber 2. When disassembling any one or two of a set of valve core structures 3, only one electromagnetic pilot valve 5 needs to be disassembled, thereby reducing the maintenance workload.

[0058] In the description of the present disclosure, it needs to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present disclosure.

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

[0060] In the description of the present disclosure, “plurality” means two or more.

[0061] In the description of the present disclosure, a first feature being “on” or “under” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

[0062] In the description of the present disclosure, “on”, “over” and “above” a first feature of a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0063] In the description of the present disclosure, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0064] Although embodiments of the present disclosure have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit of the present 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 main valve body and a valve core structure arranged in the main valve body, the valve core structure includes a valve sleeve assembly and a valve core assembly, the valve sleeve assembly is arranged on the outside of the valve core assembly, a first valve seat is arranged at one end of the valve sleeve assembly, 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, and a first stopper is arranged on the outer periphery of one end of the second valve core passing through the first valve seat.

2. The electro-hydraulic controlled directional main valve according to claim 1, characterized in that: The valve sleeve assembly comprises a first valve sleeve and a second valve sleeve. The first valve sleeve and the second valve sleeve are butted against each other and are interference fitted. The first valve sleeve and the first valve seat are interference fitted.

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, the extension portion is butted against the clamping portion to form a first sealing groove therebetween, and a first sealing member is disposed in the first sealing groove.

4. The electro-hydraulic controlled directional main valve according to claim 2, characterized in that: A second valve seat is disposed at the other end of the valve sleeve assembly, the second valve seat is connected to the main valve body via threads, and the second valve seat is connected to an end of the second valve sleeve; and / or A second stopper is arranged between the second valve seat and the second valve sleeve.

5. The electro-hydraulic controlled directional main valve according to claim 1, characterized in that: The second valve core has a step portion extending radially outward, a spring is arranged between the step portion and the first valve seat, a second sealing groove and a third sealing groove are respectively arranged on the inner and outer sides of the first valve seat, a second sealing member is arranged in the second sealing groove, and a third sealing member is arranged in the third sealing groove.

6. The electro-hydraulic controlled directional main valve according to claim 2, characterized in that: A first liquid inlet is arranged on the first valve sleeve, a first liquid return port is arranged on the second valve sleeve, a first working port is arranged on the second valve core, a second liquid inlet connected to a liquid source, a second liquid return port connected to a liquid return tank, and a plurality of second working ports are arranged at one end of the main valve body, the second liquid inlet is communicated with the first liquid inlet, the second liquid return port is communicated with the first liquid return port, and the second working port is communicated with the first working port.

7. The electro-hydraulic controlled directional main valve according to claim 4, characterized in that: One end of the first valve core close to the second valve seat forms a control chamber with the first valve sleeve. A pilot hole is arranged on the periphery of the first valve sleeve. The control chamber is connected to the electromagnetic pilot valve through the pilot hole.

8. A pilot-operated electro-hydraulic controlled directional valve, characterized in that: It comprises the electro-hydraulic controlled reversing main valve as described in any one of claims 1 to 7, wherein the pilot electro-hydraulic controlled reversing valve further comprises an electromagnetic pilot valve, which is arranged at the end of the main valve body and is arranged in sequence with the electromagnetic pilot valve along the first direction.

9. The pilot-operated electro-hydraulic controlled directional valve according to claim 8, characterized in that: The electromagnetic pilot valve comprises a pilot valve body, and one end of the pilot valve body close to the main valve body is provided with a third liquid inlet, a third liquid return port and a plurality of third working ports, and the third liquid inlet, the third liquid return port and the third working ports are arranged in the same row.

10. The pilot-operated electro-hydraulic controlled directional valve according to claim 9, characterized in that: The valve core structure is arranged along a first direction; and / or The valve core structure and the pilot valve body are arranged correspondingly.

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