Electromagnetic pilot operated valve, electro-hydraulic control reversing valve and hydraulic system

Abstract

The utility model provides an electromagnetic pilot operated valve, an electro-hydraulic control reversing valve and a hydraulic system.The electromagnetic pilot operated valve is connected with an electro-hydraulic control reversing main valve, the electro-hydraulic control reversing main valve comprises a main valve body, the electromagnetic pilot operated valve comprises a pilot operated valve body, an electromagnet and a cover plate which are sequentially arranged in the first direction, and the electromagnetic pilot operated valve further comprises a first fastener; the first fastener penetrates through the electromagnet and the pilot valve body and then is connected with the main valve body, a pilot valve element is arranged in the pilot valve body, and the first fastener and the pilot valve element are arranged in the first direction. The electromagnetic pilot valve and the electro-hydraulic control reversing main valve are fixed through the first fastening piece, the first fastening piece is arranged in the length direction of the electromagnetic pilot valve, the layout structure of the electromagnetic pilot valve is reasonably optimized, the structure is more compact, a pilot valve body of the electromagnetic pilot valve is thinner, in the thin coal seam mining process, a support oil cylinder can descend to the bottommost position, and therefore the thin coal seam mining efficiency is improved. And the coal seam mining is more comprehensive.

Description

Technical Field

[0001] This disclosure relates to the field of valve technology, and in particular to an electromagnetic pilot valve, an electro-hydraulic directional valve, and a hydraulic system. 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. Existing electromagnetic pilot 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. Utility Model Content

[0004] This disclosure aims to at least solve the technical problem in the prior art where the thickness of electromagnetic pilot valves is generally too thick, which prevents hydraulic supports from being lowered to the lowest point during thin coal seam mining, thus limiting the effective mining of some extremely thin coal seams.

[0005] Therefore, one object of this disclosure is to provide an electromagnetic pilot valve connected to an electro-hydraulic directional control main valve, wherein the electro-hydraulic directional control main valve includes a main valve body, and the electromagnetic pilot valve includes a pilot valve body, an electromagnet, and a cover plate arranged sequentially along a first direction. The electromagnetic pilot valve also includes a first fastener, which passes through the electromagnet and the pilot valve body and is connected to the main valve body. A pilot valve core is disposed in the pilot valve body, and the first fastener and the pilot valve core are arranged along the first direction.

[0006] In some embodiments, the electromagnetic pilot valve includes a second fastener that passes through the electromagnet and is connected to the pilot valve body.

[0007] In some embodiments, the electromagnetic pilot valve includes a third fastener disposed on the cover plate, the third fastener passing through the cover plate and connected to the electromagnet.

[0008] In some embodiments, an installation notch is provided at the edge of the cover plate, and the first fastener and the second fastener are installed in the installation notch.

[0009] In some embodiments, the second fastener and the third fastener are disposed along the first direction.

[0010] In some embodiments, the first fastener and the second fastener are arranged diagonally along the cover plate.

[0011] In some embodiments, the end of the pilot valve body is provided with a first liquid inlet, a first liquid return port, a plurality of first working ports and a valve core hole, wherein the first liquid inlet, the first liquid return port and the plurality of first working ports are arranged in the same row and close to the valve core hole.

[0012] In some embodiments, the pilot valve core is disposed in the valve core hole, and the pilot valve core is provided with a second inlet, a second return port and a plurality of second working ports. The second inlet and the first inlet are connected through a first flow channel, the second inlet and the second inlet are connected through a second flow channel, and the second working port and the first working port are connected through a third flow channel.

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

[0014] Another object of this disclosure is to provide a hydraulic system including the aforementioned electro-hydraulic directional valve.

[0015] The electromagnetic pilot valve, electro-hydraulic directional valve, and hydraulic system provided in this disclosure have the following beneficial effects:

[0016] The electromagnetic pilot valve provided in this embodiment is secured to the electro-hydraulic directional main valve by a first fastener. The first fastener is arranged along the length of the electromagnetic pilot valve, and both the first fastener and the pilot valve core are arranged along the length of the pilot valve. The optimized layout of the electromagnetic pilot valve results in a more compact structure and a thinner pilot valve body. During thin coal seam mining, the support cylinder can descend to its lowest point, allowing for more comprehensive coal seam mining. Attached Figure Description

[0017] 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.

[0018] Figure 1 This is a schematic diagram of the structure of the hydraulic support in the embodiments of this disclosure;

[0019] Figure 2 This is a perspective view of the electro-hydraulic directional valve in the embodiments of this disclosure;

[0020] Figure 3 This is a perspective view of the electromagnetic pilot valve in an embodiment of this disclosure;

[0021] Figure 4 This is another perspective view of the electromagnetic pilot valve in the embodiments of this disclosure;

[0022] Figure 5 This is a cross-sectional view of the electromagnetic pilot valve in an embodiment of this disclosure;

[0023] Figure 6 This is a schematic diagram of the internal structure of the electromagnetic pilot valve in an embodiment of this disclosure.

[0024] Figure label:

[0025] 1. Pilot valve body; 11. First inlet; 12. First return port; 13. First working port; 14. Valve core hole; 15. Pilot valve core; 151. Second inlet; 152. Second return port; 153. Second working port; 2. Electromagnet; 3. Cover plate; 31. Button; 32. Housing; 33. Mounting notch; 331. First notch; 332. Second notch; 4. Fourth fastener; 5. Third fastener; 6. First fastener; 7. Second fastener; 100. Hydraulic support; 101. Support top beam; 200. Support cylinder; 300. Electro-hydraulic directional main valve; 301. Main valve body. Detailed Implementation

[0026] Various embodiments and features of this disclosure are described herein with reference to the accompanying drawings.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] The first embodiment of this disclosure provides an electro-hydraulic directional valve, such as Figure 1 and Figure 2 As shown, the electro-hydraulic directional valve is located below the support top beam 101 between two adjacent support cylinders 200 of the hydraulic support 100. The electro-hydraulic directional valve is used to control the movement of the actuators. The electro-hydraulic directional valve includes an electro-hydraulic directional main valve 300 and a solenoid pilot valve. One solenoid pilot valve and one electro-hydraulic directional main valve 300 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 actuators, thereby controlling the actuators to move simultaneously. The solenoid pilot valve is located at the end of the main valve body 301 of the electro-hydraulic directional main valve 300 and is sequentially connected to the solenoid pilot valve along the first direction, which refers to the length direction of the main valve body 301. Compared to an arrangement where the electro-hydraulic directional main valve 300 and the solenoid pilot valve are arranged side-by-side along the height direction, this arrangement makes the electro-hydraulic directional valve thinner in the height direction. During thin coal seam mining, the hydraulic support 100 can be lowered to the bottom, which is beneficial for application in thin coal seam conditions and makes coal seam mining more thorough.

[0034] A second embodiment of this disclosure provides an electromagnetic pilot valve, such as Figures 3-6 As shown, the electromagnetic pilot valve is located at the end of the main valve body 301 of the electro-hydraulic directional valve 300. The electro-hydraulic directional valve 300 and the electromagnetic pilot valve are arranged sequentially along the first direction, which refers to the length direction of the main valve body 301. Compared with the electro-hydraulic directional valve 300 and the electromagnetic pilot valve being arranged side by side along the height direction of the main valve body 301, the electro-hydraulic directional valve is thinner in the height direction.

[0035] In this embodiment, the electromagnetic pilot valve includes a pilot valve body 1, an electromagnet 2, and a cover plate 3, which are connected sequentially along a first direction. The cover plate 3 houses a control circuit, a 4-pin socket, and a manual pressing mechanism. The control circuit controls the energization or de-energization of the electromagnet 2. The 4-pin socket is connected to a power source. The manual pressing mechanism engages with two buttons 31 on the cover plate 3; one button 31 energizes the electromagnet 2, and the other button 31 de-energizes it. A housing 32 is mounted on the cover plate 3. The buttons 31 are located within the housing 32 and move along it. Multiple fourth fasteners 4 are installed on the cover plate 3 near the housing 32, securing the housing 32 and the cover plate 3 together to ensure reliable connection.

[0036] Furthermore, mounting notches 33 are provided around the perimeter of the cover plate 3. Specifically, the mounting notches 33 include a first notch 331 and a second notch 332. A first fastener 6 is installed at the first notch 331, and a second fastener 7 is installed at the second notch 332. Multiple third fasteners 5 are provided in the middle of the cover plate 3. The third fasteners 5 pass through the cover plate 3 and the electromagnet 2 in sequence to fix the cover plate 3 and the electromagnet 2. In this embodiment, the mounting notches 33 are provided at the edge of the cover plate 3 to avoid interference between the first fasteners 6 and the second fasteners 7 and the internal structure of the electromagnet 2 and the pilot valve body 1. The third fasteners 5 are provided in the middle of the cover plate 3. The installation positions of the first fasteners 6, the second fasteners 7 and the third fasteners 5 on the cover plate 3 are reasonably set, making the spatial layout of the electromagnetic pilot valve more compact, and thus the thickness of the electromagnetic pilot valve thinner.

[0037] Specifically, the first fastener 6 passes through the electromagnet 2 and the pilot valve body 1 in sequence and connects to the main valve body 301, thus connecting the entire electromagnetic pilot valve to the electro-hydraulic directional main valve 300; the second fastener 7 passes through the electromagnet 2 and the pilot valve body 1 in sequence to fix the electromagnet 2 and the pilot valve body 1. In this embodiment, the second fastener 7 is set to achieve a stable connection between the pilot valve body 1 and the electromagnet 2, the first fastener 6 is set to achieve a stable connection between the electromagnet 2, the pilot valve body 1 and the main valve body 301, and the third fastener 5 is set to achieve a stable connection between the cover plate 3 and the electromagnet 2, ensuring the reliability of the connection between the components of the electromagnetic pilot valve and facilitating installation and disassembly. The first fastener 6, the second fastener 7, and the third fastener 5 are all set along the first direction (the length direction of the electromagnetic pilot valve). Compared with setting them along the width direction of the electromagnetic pilot valve, this setting of the first fastener 6, the second fastener 7, and the third fastener 5 can effectively avoid interference with the valve core structure of the pilot valve core 15 and the electro-hydraulic directional main valve 300, and at the same time, it is beneficial to reduce the thickness of the pilot valve body 1.

[0038] Furthermore, a pilot valve core 15 is provided inside the pilot valve body 1, and the first fastener 6 and the pilot valve core 15 are arranged along the first direction. Here, the first fastener 6 and the pilot valve core 15 are arranged in the same direction to avoid interference between the first fastener 6 and the pilot valve core 15. Moreover, this arrangement makes the structure more compact and further reduces the thickness of the pilot valve body 1.

[0039] Furthermore, the first fastener 6 is arranged diagonally along the cover plate 3, and the second fastener 7 is arranged diagonally along the cover plate 3, which helps to improve the stability of the connection.

[0040] In this embodiment, the pilot valve body 1 has a first inlet 11, a first return port 12, and a plurality of first working ports 13 at its end, and a pilot valve core 15 is disposed inside the pilot valve body 1. Specifically, the pilot valve body 1 has a first inlet 11, a first return port 12, a plurality of first working ports 13, and a valve core hole 14 at its end, and the pilot valve core 15 is disposed inside the valve core hole 14. The first inlet 11, the first return port 12, and the plurality of first working ports 13 are arranged in the same row and close to the valve core hole 14. Further, the pilot valve core 15 has a second inlet 151, a second return port 152, and a second working port 153. The second inlet 151 and the first inlet 11 are connected through a first flow channel, the second inlet 151 and the first working port 13 are connected through a second flow channel, and the second working port 153 and the first working port 13 are connected through a third flow channel. In this embodiment, the first inlet 11, the first return port 12, and a plurality of first working ports 13 are arranged in the same column and close to the valve core hole 14. Compared with the first inlet 11, the first return port 12, and the plurality of first working ports 13 being staggered on the pilot valve body 1 (for example, arranged in two columns), this method optimizes the spatial layout. The distances of the first inlet 11, the first return port 12, and the plurality of first working ports 13 from the edge of the pilot valve body 1 are consistent, thereby minimizing the thickness of the pilot valve body 1 of the pilot valve.

[0041] Furthermore, the number of first working ports 13 of each electromagnetic pilot valve is consistent with the number of valve core structures of the electro-hydraulic directional main valve 300. The first working ports 13 correspond one-to-one with the main valve core structure of the electro-hydraulic directional main valve 300. The pilot valve core 15 adopts a hydraulically balanced ball valve structure and is connected to the electromagnet 2 through a lever. Its working principle is as follows: When the electromagnet 2 is de-energized, the first return port 12 and the first working port 13 are connected, the first inlet port 11 and the first working port 13 are closed, and the first inlet port 11 and the first return port 12 are closed. The electromagnetic pilot valve does not supply liquid to the electro-hydraulic directional main valve 300, and the valve core structure of the electro-hydraulic directional main valve 300 is closed. When the electromagnet 2 is energized, the pilot valve core 15 is connected to the electromagnet 2 through a lever. The first working port 13 and the first inlet port 11 are connected, the first working port 13 and the first return port 12 are closed, and the first inlet port 11 and the first return port 12 are closed. The electromagnetic pilot valve supplies high-pressure liquid to the electro-hydraulic directional main valve 300, and the valve core structure of the electro-hydraulic directional main valve 300 is opened.

[0042] 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.

[0043] 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.

[0044] In the description of this disclosure, "first feature" and "second feature" may include one or more of the features.

[0045] In the description of this disclosure, "multiple" means two or more.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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 electromagnetic pilot valve connected to an electro-hydraulic directional control main valve, the electro-hydraulic directional control main valve comprising a main valve body, characterized in that, The electromagnetic pilot valve includes a pilot valve body, an electromagnet, and a cover plate arranged sequentially along a first direction. The electromagnetic pilot valve also includes a first fastener, which passes through the electromagnet and the pilot valve body and is connected to the main valve body. A pilot valve core is disposed inside the pilot valve body. The first fastener and the pilot valve core are arranged along the first direction.

2. The electromagnetic pilot valve according to claim 1, characterized in that, The electromagnetic pilot valve includes a second fastener, which passes through the electromagnet and is connected to the pilot valve body.

3. The electromagnetic pilot valve according to claim 2, characterized in that, The electromagnetic pilot valve includes a third fastener disposed on the cover plate, which passes through the cover plate and is connected to the electromagnet.

4. The electromagnetic pilot valve according to claim 2, characterized in that, An installation notch is provided at the edge of the cover plate, and the first fastener and the second fastener are installed in the installation notch.

5. The electromagnetic pilot valve according to claim 3, characterized in that, The second fastener and the third fastener are arranged along the first direction.

6. The electromagnetic pilot valve according to claim 2, characterized in that, The first fastener and the second fastener are arranged diagonally along the cover plate.

7. The electromagnetic pilot valve according to claim 3, characterized in that, The pilot valve body is provided with a first liquid inlet, a first liquid return port, multiple first working ports and a valve core hole at its end. The first liquid inlet, the first liquid return port and the multiple first working ports are arranged in the same row and close to the valve core hole.

8. The electromagnetic pilot valve according to claim 7, characterized in that, The pilot valve core is disposed in the valve core hole. The pilot valve core is provided with a second liquid inlet, a second liquid return port and a plurality of second working ports. The second liquid inlet and the first liquid inlet are connected through a first flow channel. The second liquid inlet and the second liquid return port are connected through a second flow channel. The second working port and the first working port are connected through a third flow channel.

9. An electro-hydraulic directional control valve, characterized in that, The electro-hydraulic directional valve includes any one of claims 1-8, and further includes an electro-hydraulic directional main valve. The electromagnetic pilot valve is disposed at the end of the main valve body and is arranged sequentially with the electromagnetic pilot valve along the first direction.

10. A hydraulic system, characterized in that, Including the electro-hydraulic directional valve as described in claim 9.

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