Self-locking mine electro-hydraulic control reversing valve

Abstract

The utility model relates to a self -locking type mine electro -hydraulic control reversing valve belongs to reversing valve technical field, including the valve body, is fixedly arranged with a plurality of groups of electromagnetic pilot valve on the valve body, each group includes two electromagnetic pilot valve, is provided with a plurality of groups of main valve installation cavity in the valve body, each group includes two main valve installation cavity, and each main valve installation cavity is provided with a main valve assembly respectively in the inside portion, the group number of main valve assembly is same with the group number of electromagnetic pilot valve and is one -to -one correspondence, two main valve assemblies in each group inside are connected with two electromagnetic pilot valves in corresponding one group inside respectively, two working oil ports of each group main valve assembly are connected with a hydraulic oil cylinder through the same group self -locking mechanism, the self -locking mechanism includes two check valves and a slide valve, and the slide valve is slidably arranged between the two check valves, solve the current "electro -hydraulic reversing valve + hydraulic control check valve's hydraulic circuit configuration integration is low, the problem of big space occupation.

Description

Technical Field

[0001] This utility model belongs to the field of directional valve technology, specifically relating to a self-locking electro-hydraulic directional valve for mining. Background Technology

[0002] In the field of intelligent mining in fully mechanized longwall faces, the electro-hydraulic control system of hydraulic supports mostly adopts a center-position Y-type electro-hydraulic directional valve. To ensure that the actuators of the hydraulic support (including but not limited to the column, side support jacks, and telescopic beam jacks) can reliably lock and position at any stroke position, the current scheme generally adopts a hydraulic circuit configuration of "electro-hydraulic directional valve + hydraulically controlled check valve". However, this configuration has obvious limitations in space-constrained applications such as thin coal seam supports, temporary support equipment, and self-propelled devices: the integration of hydraulic components is low, the space occupied is large, and the complex pipeline connections restrict the structural compactness and reliability of the equipment. Utility Model Content

[0003] This invention overcomes the shortcomings of existing technologies and proposes a self-locking electro-hydraulic directional valve for mining; it solves the problems of low integration and large space occupation in the current hydraulic circuit configuration of "electro-hydraulic directional valve + hydraulic check valve".

[0004] To achieve the above objectives, this utility model is implemented through the following technical solution.

[0005] A self-locking electro-hydraulic directional valve for mining includes a valve body. Multiple sets of electromagnetic pilot valves are fixedly installed at the upper end of the valve body, each set including two electromagnetic pilot valves. Multiple sets of main valve mounting chambers are provided inside the valve body, each set including two main valve mounting chambers. Each main valve mounting chamber contains a main valve assembly. The number of main valve assemblies is the same as the number of electromagnetic pilot valve sets and corresponds one-to-one. The two main valve assemblies in each set are respectively connected to the two electromagnetic pilot valves in the corresponding set. The two working ports of each main valve assembly are connected to a hydraulic cylinder through the same self-locking mechanism. The self-locking mechanism includes two check valves and a spool valve, with the spool valve slidably positioned between the two check valves.

[0006] Furthermore, the valve body is provided with a main oil inlet and a main oil return port, a main oil inlet channel is provided inside the main oil inlet, and a main oil return channel is provided inside the main oil return port; inside the valve body, there are pilot oil inlet channel, pilot oil return channel, main valve oil inlet channel, main valve oil return channel, and working oil channel.

[0007] Furthermore, the oil inlet of all electromagnetic pilot valves is connected to the pilot oil inlet channel, and the oil return port of all electromagnetic pilot valves is connected to the pilot oil return channel; the oil inlet of all main valve assemblies is connected to the main valve oil inlet channel, and the oil return port of all main valve assemblies is connected to the main valve oil return channel.

[0008] Furthermore, the working oil port of each electromagnetic pilot valve is connected to the hydraulic control port of the corresponding main valve assembly through a working oil passage.

[0009] Furthermore, the pilot oil inlet channel and the main valve oil inlet channel are both connected to the main oil inlet channel, and the pilot oil return channel and the main valve oil return channel are both connected to the main oil return channel.

[0010] Furthermore, an inlet check valve is installed on the pilot oil inlet channel, and a return check valve is installed on the pilot oil return channel; a pilot filter element is installed on the valve body, the pilot filter element is located on the pilot oil inlet channel, and the pilot filter element is located on the side of the inlet check valve away from the main oil inlet.

[0011] Furthermore, multiple self-locking mounting cavities with open ends are installed on the valve body. Each self-locking mounting cavity contains a set of self-locking mechanisms. Two check valves are respectively located at the two end openings of the self-locking mounting cavity, and a spool valve is slidably located in the middle of the self-locking mounting cavity. The two main valve mounting cavities are respectively connected to the interior of the corresponding self-locking mounting cavity through an oil outlet channel, and the two oil outlet channels are located on both sides of the spool valve. Two oil outlets are provided on the side wall of the self-locking mounting cavity. Both oil outlets are connected to the outer side of the valve body. The two oil outlets are located at the two check valves. One oil outlet is connected to the rodless chamber of the corresponding hydraulic cylinder, and the other oil outlet is connected to the rod chamber of the corresponding hydraulic cylinder.

[0012] Furthermore, a fixing cavity is provided at both ends of the self-locking mounting cavity, and the inner diameter of the fixing cavity is larger than the inner diameter of the self-locking mounting cavity; an internal threaded hole is provided at the opening of the two fixing cavities on the side away from the self-locking mounting cavity, and the inner diameter of the internal threaded hole is larger than the inner diameter of the fixing cavity.

[0013] Furthermore, the one-way valve includes a plug, a valve sleeve, a spring, and a valve core. The valve sleeve is disposed inside the fixed cavity, and a circular fixing ring is fixedly disposed on the outer side of the opening on the side of the valve sleeve facing the internal threaded hole. The fixing ring is in contact with the end face of the internal threaded hole near the fixed cavity. An oil inlet hole is provided at the center of the side of the valve sleeve facing the self-locking mounting cavity. An oil passage hole is provided on the side wall of the valve sleeve, and the oil passage hole is connected to the oil outlet on the same side. A plug is screwed into the internal threaded hole, and one end of the plug is in contact with the end of the valve sleeve away from the self-locking mounting cavity. A valve core is slidably disposed inside the valve sleeve, and a spring is disposed between the valve core and the plug.

[0014] Furthermore, the middle part of the slide valve has a cylindrical structure, and a sealing ring is provided on the outer side of the middle part of the slide valve. The diameter of the slide valve gradually decreases from the middle to both ends.

[0015] The beneficial effects of this utility model compared to the prior art are as follows: This utility model discloses a self-locking electro-hydraulic directional valve for mining. Through a special design, a self-locking mechanism is integrated inside the electro-hydraulic directional valve, which meets the needs of space-constrained application scenarios such as thin coal seam supports, temporary support equipment and self-moving devices. It improves the integration of the electro-hydraulic directional valve, reduces space occupation, and simplifies system piping. Attached Figure Description

[0016] The present invention will now be described in further detail with reference to the accompanying drawings: Figure 1 This is a three-dimensional schematic diagram of the entire utility model; Figure 2 This is a front view of the entire utility model; Figure 3 This is a top view of the valve body; Figure 4 yes Figure 3 AA section view in the middle; Figure 5 yes Figure 3 BB section view in the middle; Figure 6 yes Figure 4 A partially enlarged schematic diagram of the check valve in the middle section; Figure 7 This is a hydraulic schematic diagram of this utility model; Among them, 1 is valve body, 2 is solenoid pilot valve, 3 is main valve assembly, 4 is check valve, 5 is spool valve, 6 is main oil inlet, 7 is main oil return port, 8 is main oil inlet channel, 9 is main oil return channel, 10 is pilot oil inlet channel, 11 is pilot oil return channel, 12 is main valve oil inlet channel, 13 is main valve oil return channel, 14 is working oil channel, 15 is inlet check valve, 16 is return check valve, 17 is pilot filter element, 18 is self-locking mounting cavity, 19 is oil outlet channel, 20 is oil outlet, 21 is valve sleeve, 22 is copper gasket, 23 is screw plug, 24 is valve core, 25 is spring, 26 is sealing ring, 27 is oil inlet hole, and 28 is oil passage hole. Detailed Implementation

[0017] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, this utility model will be further described in detail with reference to the embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of this utility model and are not intended to limit it. The technical solution of this utility model will be described in detail below with reference to the embodiments and accompanying drawings, but the scope of protection is not limited thereto.

[0018] like Figure 1As shown in Figure 7, this utility model provides a self-locking electro-hydraulic directional valve for mining, including a valve body 1. Multiple sets of electromagnetic pilot valves 2 are fixedly arranged on the upper end of the valve body 1, each set including two electromagnetic pilot valves 2. Multiple sets of main valve mounting chambers are arranged inside the valve body 1, each set including two main valve mounting chambers. Each main valve mounting chamber contains a main valve assembly 3. The number of main valve assemblies 3 is the same as the number of electromagnetic pilot valves 2 and corresponds one-to-one. The two main valve assemblies 3 in each set are respectively connected to the two electromagnetic pilot valves 2 in the corresponding set. The two working ports of each set of main valve assemblies 3 are connected to a hydraulic cylinder through the same self-locking mechanism. The self-locking mechanism includes two check valves 4 and a slide valve 5, with the slide valve 5 slidably disposed between the two check valves 4.

[0019] The valve body 1 is provided with a main oil inlet 6 and a main oil return port 7. A main oil inlet channel 8 is provided inside the main oil inlet 6, and a main oil return channel 9 is provided inside the main oil return port 7. Inside the valve body 1, there are pilot oil inlet channel 10, pilot oil return channel 11, main valve oil inlet channel 12, main valve oil return channel 13, and working oil channel 14.

[0020] All the inlets of the electromagnetic pilot valves 2 are connected to the pilot inlet channel 10, and all the return ports of the electromagnetic pilot valves 2 are connected to the pilot return channel 11.

[0021] All the oil inlets of the main valve assembly 3 are connected to the main valve oil inlet channel 12, and all the oil return ports of the main valve assembly 3 are connected to the main valve oil return channel 13.

[0022] Each solenoid pilot valve 2 has its working port connected to the hydraulic control port of the corresponding main valve assembly 3 via a working oil passage 14.

[0023] The pilot oil inlet channel 10 and the main valve oil inlet channel 12 are both connected to the main oil inlet channel 8, and the pilot oil return channel 11 and the main valve oil return channel 13 are both connected to the main oil return channel 9.

[0024] An inlet check valve 15 is provided on the pilot inlet channel 10, and a return check valve 16 is provided on the pilot return channel 11. A pilot filter element 17 is installed on the valve body 1. The pilot filter element 17 is located on the pilot inlet channel 10, and the pilot filter element 17 is located on the side of the inlet check valve 15 away from the main inlet port 6.

[0025] Multiple self-locking mounting cavities 18, each penetrating both ends, are installed on the valve body 1. Each self-locking mounting cavity 18 contains a set of self-locking mechanisms. Two check valves 4 are respectively located at the openings at both ends of the self-locking mounting cavity 18, and a spool valve 5 is slidably positioned in the middle of the self-locking mounting cavity 18. Two main valve mounting cavities are each connected to the interior of their respective self-locking mounting cavities 18 via an oil outlet channel 19, which is located on either side of the spool valve 5. Two oil outlets 20 are provided on the sidewall of each self-locking mounting cavity 18. Both oil outlets 20 are connected to the outer surface of the valve body 1 and are located at the two check valves 4. One oil outlet 20 is connected to the rodless chamber of the corresponding hydraulic cylinder, and the other oil outlet 20 is connected to the rod chamber of the corresponding hydraulic cylinder.

[0026] The one-way valve 4 includes a plug 23, a valve sleeve 21, a spring 25, a valve core 24, and a copper gasket 22. Fixed cavities are provided at both ends of the self-locking mounting cavity 18, with the inner diameter of the fixed cavity being larger than that of the self-locking mounting cavity 18. Internal threaded holes are provided at the openings of the two fixed cavities on the side away from the self-locking mounting cavity 18, with the inner diameter of the internal threaded holes being larger than that of the fixed cavities. The valve sleeve 21 is disposed inside the fixed cavity and has a cylindrical structure. A circular fixing ring is fixedly provided on the outer side of the opening of the valve sleeve 21 facing the internal threaded hole, and the fixing ring contacts the end face of the internal threaded hole near the fixed cavity. An oil inlet 27 is provided at the center of the side of the valve sleeve 21 facing the self-locking mounting cavity 18. An oil passage hole 28 is provided on the side wall of the valve sleeve 21, and the oil passage hole 28 is connected to the oil outlet 20 on the same side. A circular copper pad 22 is provided at one end of the valve sleeve 21 near the self-locking mounting cavity 18, and the copper pad 22 contacts the end face of the fixed cavity near the self-locking mounting cavity 18. A screw plug 23 is screwed into the internal threaded hole, and one end of the screw plug 23 contacts the end of the valve sleeve 21 away from the self-locking mounting cavity 18. A valve core 24 is slidably disposed inside the valve sleeve 21, and a spring 25 is disposed between the valve core 24 and the screw plug 23. One end of the spring 25 is disposed inside the screw plug 23, and the other end of the spring 25 is disposed inside the valve core 24. Under the action of the spring 25's rebound force, the end of the valve core 24 near the self-locking mounting cavity 18 seals the oil inlet 27 of the valve sleeve 21.

[0027] To meet the requirements of compact space, the seal between valve sleeve 21 and valve body 1 is innovatively achieved using a copper gasket 22, ensuring sealing reliability under high pressure. To ensure the sealing accuracy of the mating surfaces of valve core 24 and valve sleeve 21, valve sleeve 21 is heat-treated and then precision-machined in one clamping operation using a double-head lathe. This process effectively guarantees the key dimensional and geometric tolerances of the valve sleeve, thereby fundamentally ensuring the overall sealing performance of the self-locking mechanism.

[0028] The slide valve 5 has a cylindrical structure in the middle, and a sealing ring 26 is provided on the outer side of the middle part of the slide valve 5. The sealing ring 26 ensures the sealing between the outer side of the middle part of the slide valve 5 and the inner wall of the self-locking mounting cavity 18, which can isolate the oil chambers corresponding to the one-way valves 4 on both sides and effectively prevent liquid leakage between the main valve components 3 with different functions. The diameter of the slide valve 5 gradually decreases from the middle to both ends. In the initial state, the slide valve 5 is located in the middle of the self-locking mounting cavity 18. The cylindrical surface of the slide valve 5 is designed with pressure equalization grooves, which can significantly balance the radial hydraulic pressure it receives when moving in the valve hole, greatly reducing the risk of jamming caused by uneven radial force.

[0029] The working principle of this utility model is as follows: When it is necessary to control the movement of a hydraulic cylinder, a control signal is sent to a set of pilot solenoid valves corresponding to the hydraulic cylinder. The pilot solenoid valves drive the corresponding first main valve assembly 3 to open. Hydraulic oil enters from the main inlet 6, passes through the first main valve assembly 3, and then enters the self-locking mounting cavity 18 through the oil outlet channel 19 of the first main valve assembly 3, and is located at the end face of the first check valve 4. Under the pressure of the hydraulic oil, the valve core 24 inside the first check valve 4 is pushed open, and the hydraulic oil enters from the oil inlet 27 of the valve sleeve 21 of the first check valve 4 into the valve sleeve 21, and then enters from the oil passage 28 on the side wall of the valve sleeve 21 into the first oil outlet 20 on the side wall of the self-locking mounting cavity 18, and is then output to the rodless chamber of the hydraulic cylinder. Simultaneously, the hydraulic oil entering the self-locking mounting cavity 18 acts on the end face of the slide valve 5 near the first check valve 4, causing the slide valve 5 to gradually slide towards the second check valve 4 under the pressure of the hydraulic oil. The end of the slide valve 5 near the second check valve 4 passes through the oil inlet hole 27 of the valve sleeve 21 of the second check valve 4 and enters the interior of the valve sleeve 21, pushing open the valve core 24 inside the valve sleeve 21, connecting the oil inlet hole 27 of the second valve sleeve 21 with the oil passage hole 28. In this way, the return oil from the rod chamber of the hydraulic cylinder flows through the second oil outlet 20 on the side wall of the self-locking mounting cavity 18, and flows through the second check valve 4, entering the oil outlet channel 19 of the second main valve assembly 3, and finally flowing into the main return port 7 after passing through the second main valve assembly 3.

[0030] Two internal main valve assemblies 3 together form a three-way four-way directional valve. When all the solenoid pilot valves 2 are de-energized and in the neutral position, the residual hydraulic oil inside the corresponding oil outlet channels 19 of the two main valve assemblies 3 can flow to the main return channel 9 through the internal channels of the two main valve assemblies 3 for pressure relief. This pressure relief function ensures that the two check valves 4 of the self-locking mechanism remain closed under the action of their internal springs 25, thereby sealing the oil at the two oil outlets 20 on the side wall of the self-locking mounting cavity 18, so that the hydraulic cylinder is firmly locked in the predetermined position. The stiffness of the springs 25 can be specially designed according to different working conditions to improve the response speed of the self-locking mechanism.

[0031] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A self-locking electro-hydraulic directional valve for mining, characterized in that: The valve body (1) includes a valve body (1), and multiple sets of electromagnetic pilot valves (2) are fixedly installed on the upper end of the valve body (1). Each set includes two electromagnetic pilot valves (2). Multiple sets of main valve mounting chambers are provided inside the valve body (1). Each set includes two main valve mounting chambers. Each main valve mounting chamber is provided with a main valve assembly (3). The number of sets of main valve assemblies (3) is the same as the number of sets of electromagnetic pilot valves (2) and they correspond one-to-one. The two main valve assemblies (3) inside each set are respectively connected to the two electromagnetic pilot valves (2) inside the corresponding set. The two working oil ports of each set of main valve assemblies (3) are connected to a hydraulic cylinder through the same set of self-locking mechanisms. The self-locking mechanism includes two check valves (4) and a slide valve (5). The slide valve (5) is slidably disposed between the two check valves (4).

2. The self-locking electro-hydraulic directional valve for mining as described in claim 1, characterized in that: A main oil inlet (6) and a main oil return port (7) are provided on the valve body (1). A main oil inlet channel (8) is provided inside the main oil inlet (6), and a main oil return channel (9) is provided inside the main oil return port (7). A pilot oil inlet channel (10), a pilot oil return channel (11), a main valve oil inlet channel (12), a main valve oil return channel (13), and a working oil channel (14) are provided inside the valve body (1).

3. A self-locking electro-hydraulic directional valve for mining according to claim 2, characterized in that: All the inlets of the electromagnetic pilot valves (2) are connected to the pilot inlet channel (10), and all the return ports of the electromagnetic pilot valves (2) are connected to the pilot return channel (11); all the inlets of the main valve assemblies (3) are connected to the main valve inlet channel (12), and all the return ports of the main valve assemblies (3) are connected to the main valve return channel (13).

4. A self-locking electro-hydraulic directional valve for mining according to claim 2, characterized in that: Each solenoid pilot valve (2) has its working port connected to the hydraulic control port of the corresponding main valve assembly (3) via a working oil passage (14).

5. A self-locking electro-hydraulic directional valve for mining according to claim 3, characterized in that: The pilot oil inlet channel (10) and the main valve oil inlet channel (12) are both connected to the main oil inlet channel (8), and the pilot oil return channel (11) and the main valve oil return channel (13) are both connected to the main oil return channel (9).

6. A self-locking electro-hydraulic directional valve for mining as described in claim 5, characterized in that: An inlet check valve (15) is provided on the pilot inlet channel (10), and a return check valve (16) is provided on the pilot return channel (11); a pilot filter element (17) is installed on the valve body (1), the pilot filter element (17) is located on the pilot inlet channel (10), and the pilot filter element (17) is located on the side of the inlet check valve (15) away from the main inlet port (6).

7. A self-locking electro-hydraulic directional valve for mining as described in claim 1, characterized in that: Multiple self-locking mounting cavities (18) with both ends connected are installed on the valve body (1). Each self-locking mounting cavity (18) is equipped with a set of self-locking mechanisms. Two check valves (4) are respectively located at the openings at both ends of the self-locking mounting cavity (18), and a slide valve (5) is slidably located in the middle of the self-locking mounting cavity (18). The two main valve mounting cavities are respectively connected to the interior of the corresponding self-locking mounting cavity (18) through an oil outlet channel (19), and the two oil outlet channels (19) are respectively located on both sides of the slide valve (5). Two oil outlets (20) are provided on the side wall of the self-locking mounting cavity (18). Both oil outlets (20) are connected to the outer side of the valve body (1). The two oil outlets (20) are respectively located at the two check valves (4). One oil outlet (20) is connected to the rodless chamber of the corresponding hydraulic cylinder, and the other oil outlet (20) is connected to the rod chamber of the corresponding hydraulic cylinder.

8. A self-locking electro-hydraulic directional valve for mining according to claim 7, characterized in that: A fixing cavity is provided at both ends of the self-locking mounting cavity (18), and the inner diameter of the fixing cavity is larger than the inner diameter of the self-locking mounting cavity (18); an internal threaded hole is provided at the opening of the two fixing cavities on the side away from the self-locking mounting cavity (18), and the inner diameter of the internal threaded hole is larger than the inner diameter of the fixing cavity.

9. A self-locking electro-hydraulic directional valve for mining as described in claim 8, characterized in that: The one-way valve (4) includes a plug (23), a valve sleeve (21), a spring (25), and a valve core (24). The valve sleeve (21) is located inside the fixed cavity. A circular fixing ring is fixedly installed on the outer side of the opening of the valve sleeve (21) facing the internal threaded hole. The fixing ring is in contact with the end face of the internal threaded hole near the fixed cavity. An oil inlet hole (27) is provided at the center of the side of the valve sleeve (21) facing the self-locking mounting cavity (18). An oil passage hole (28) is provided on the side wall of the valve sleeve (21). The oil passage hole (28) is connected to the oil outlet (20) on the same side. A plug (23) is screwed into the internal threaded hole. One end of the inner side of the plug (23) is in contact with the end of the valve sleeve (21) away from the self-locking mounting cavity (18). A valve core (24) is slidably installed inside the valve sleeve (21). A spring (25) is provided between the valve core (24) and the plug (23).

10. A self-locking electro-hydraulic directional valve for mining according to claim 7, characterized in that: The slide valve (5) has a cylindrical structure in the middle, and a sealing ring (26) is provided on the outer side of the middle part of the slide valve (5). The diameter of the slide valve (5) gradually decreases from the middle to both ends.

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