Mining electromagnetic pilot operated valve protection structure

Abstract

The invention relates to the technical field of electromagnetic pilot valves, in particular to a mining electromagnetic pilot valve protection structure which comprises a valve body, a medium flowing cavity set is formed in the valve body, and a drum membrane piece which is provided with an open hole and controls liquid flowing is arranged in the medium flowing cavity set. The tympanic membrane piece is installed in the valve body through a connecting structure and elastically connected with the connecting structure, the valve body is provided with a pressure detection structure capable of moving up and down after being pressed, the pressure detection structure communicates with the medium flowing cavity set, and a pressing structure capable of moving up and down is arranged on the upper side of the tympanic membrane piece. According to the invention, when the pressure of a medium flowing in the medium flowing cavity group is too large, the pressure detection structure is under the high pressure of the medium, the pressure detection structure controls the pressing structure to press the drum membrane downwards through the linkage structure, and the pressing structure supports and blocks the upper side of the drum membrane, so that the medium cannot pass through the drum membrane, and the damage of the medium to the drum membrane and a subsequent structure is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of electromagnetic pilot valves, and in particular to a protective structure of an electromagnetic pilot valve for mining. Background Art

[0002] At present, with the popularization of automated working faces in coal mines, the valves used in hydraulic supports have gradually been replaced by electro-hydraulic controlled reversing valves instead of the original manual reversing valves, and the electromagnetic pilot valve is the main hydraulic component for realizing electronic control.

[0003] As a very important valve body structure, pilot-operated solenoid valves are widely used in fields such as coal mining and oil extraction, and are particularly suitable for controlling the flow of liquids, water, hot water, gas, oil, and methane. Generally, during use, when power is applied, the valve stem is lifted by electromagnetic force, and the pilot valve port is opened. At this time, the upper chamber of the solenoid valve is depressurized through the pilot hole, forming a pressure differential around the main valve core, with lower pressure at the top and higher pressure at the bottom. Under the action of this pressure differential, the fluid pressure pushes the main valve core upward to open the main valve port. When power is removed, the valve stem is reset under the action of the spring force and the weight of the main valve core, closing the pilot hole and the main valve core downward, closing the main valve port. The pressure in the upper chamber of the solenoid valve increases, and the fluid pressure pressurizes the main valve core, improving the seal.

[0004] Chinese patent CN218817306U discloses a protective structure for a solenoid pilot valve used in mining. A plug base is fixed to the top surface of an electro-hydraulic controlled directional control main valve, and an electrical plug protrudes from the plug base. The valve body of the solenoid pilot valve is formed with a base recess, and a vertically upward, inwardly concave plug-receiving hole is formed in the middle of the top wall of the base recess. A wiring socket is disposed within the plug-receiving hole. This utility model has a simple structure, with no exposed electrical connectors, eliminating the need for additional protection. Furthermore, the product is aesthetically pleasing and uncluttered after installation, standardizing the appearance of underground electro-hydraulic controlled directional control valve groups and improving reliability. However, the aforementioned related technologies have the following drawbacks: The solenoid pilot valve has high pressure requirements, and excessive pressure from the internal fluid can damage the internal components of the solenoid pilot valve. Summary of the Invention

[0005] In order to prevent the internal components of the electromagnetic pilot valve from being damaged by excessive pressure of the flowing medium, the present invention provides a protective structure for the electromagnetic pilot valve for mining.

[0006] The present invention provides a protective structure for a mining electromagnetic pilot valve, which adopts the following technical solution: it includes a valve body, a medium flow cavity group is opened inside the valve body, a tympanic membrane with an opening and controlling the flow of liquid is arranged inside the medium flow cavity group, the tympanic membrane is installed inside the valve body through a connecting structure, the tympanic membrane is elastically connected to the connecting structure, the valve body is installed with a pressure detection structure that can move up and down after being subjected to pressure, the pressure detection structure is connected to the medium flow cavity group, and a clamping structure that can move up and down is arranged on the upper side of the tympanic membrane.

[0007] The valve body upper side is provided with a linkage structure, and the pressure detection structure controls the up-down movement of the compression structure through the linkage structure.

[0008] Optionally, the medium flow cavity group comprises an inlet hole and an outlet hole, the inlet hole and the outlet hole are coaxially arranged in the valve body, the inlet hole and the outlet hole are connected with the outside of the valve body at the ends away from each other, the outlet hole is bent upward at one end inside the valve body, a ring cavity coaxially arranged with the upward bent end of the outlet hole is arranged in the valve body, and the inlet hole is connected with the inside of the ring cavity.

[0009] The eardrum piece is coaxially arranged in the ring cavity, the eardrum piece blocks the upward bent end of the outlet hole, the compression structure and the connecting structure are arranged in the ring cavity, and the pressure detection structure is connected with the inlet hole.

[0010] Optionally, the upper surface of the valve body is provided with a protective cover, and the linkage structure, the pressure detection structure, the connecting structure and the compression structure are arranged in the protective cover.

[0011] Optionally, the pressure detection structure comprises a closed cylinder and a pressure detection head, the closed cylinder is arranged in the valve body, the upper end of the closed cylinder is connected with the outside of the valve body, a pressure regulating cylinder is screwed through the upper end of the closed cylinder, the lower end of the pressure regulating cylinder is elastically connected with the upper end of the pressure detection head, and the lower end of the closed cylinder is connected with the inlet hole.

[0012] The upper end of the pressure detection head is connected with the linkage structure, the linkage structure is slidably arranged at the axis of the pressure regulating cylinder, and the closed cylinder and the pressure regulating cylinder are arranged in the protective cover.

[0013] Optionally, the connecting structure comprises a cylinder and an end cover, the end cover is arranged on the upper end of the cylinder, the end cover is arranged on the upper surface of the valve body, the cylinder is screwedly inserted into the ring cavity, the eardrum piece is coaxially arranged on the lower end of the cylinder, the upper surface of the eardrum piece at the axis is elastically connected with the bottom surface of the end cover, and the end cover is arranged in the protective cover.

[0014] Optionally, the compression structure comprises a compression ring column and a double-rod frame, the double-rod frame is slidably arranged through the upper surface of the end cover and is fixed to the upper surface of the compression ring column, the compression ring column is arranged in the inner side of the cylinder, and the double-rod frame is elastically connected with the upper surface of the end cover.

[0015] The upper end of the double-rod frame is arranged in a circular rod shape, the lower side of the circular rod shaped part of the double-rod frame is provided with a blocking frame, the blocking frame and the upper surface of the end cover can be transversely slidably connected, the blocking frame is connected with the linkage structure, and the double-rod frame is arranged in the protective cover.

[0016] Optionally, the end of the blocking frame away from the pressure detection structure is composed of a plurality of rod-shaped structures, and the end of the rod-shaped structure of the blocking frame away from the pressure detection structure is provided with a right triangle with an inclined bottom surface.

[0017] Optionally, the linkage structure includes a linkage rod and a linkage rope, the two ends of the linkage rope are respectively fixed to the linkage rod and the baffle, the upper surface of the end cover is slidably sleeved on the outer surface of the linkage rope, the upper end of the linkage rod is horizontally bent toward one end of the baffle, and the other end of the linkage rod is vertically arranged.

[0018] The vertical end of the linkage rod is passed through the axis of the pressure regulating cylinder, the lower end of the linkage rod is fixed to the upper surface of the pressure detection head, the retaining frame is elastically connected to the end cover horizontally, and the linkage rod and the linkage rope are located inside the protective cover.

[0019] A reset rod is fixed to the upper end of the vertical end of the linkage rod, and the upper end of the reset rod slides through the inner top wall of the protective cover.

[0020] Optionally, a reset telescopic rod is installed in the middle position of the upper end of the double-rod rack, and the reset telescopic rod is slidably installed through the inner top wall of the protective cover.

[0021] Optionally, two long axes are symmetrically arranged on the lower side of the upper end of the double-rod frame, and both ends of the long axis rotate through the inside of the protective cover. One end of the long axis is elastically connected to the protective cover, and the other end of the long axis is located outside the protective cover and a control rod is installed at one end.

[0022] An arc-shaped baffle is fixedly sleeved on the outer surface of the long shaft, the upper surface of the arc-shaped baffle is an arc surface, the bottom surface of the arc-shaped baffle away from the end of the long shaft is a horizontal surface, the arc-shaped baffle is located on the lower side of the round rod part at the upper end of the double-rod frame, and the arc-shaped baffle is staggered with the rod-shaped structure of the baffle frame.

[0023] The arc-shaped baffles arranged on the surfaces of the two long axes are symmetrically distributed with double rods.

[0024] In summary, the present invention has the following beneficial technical effects: The present invention cooperates with components such as a clamping structure, a linkage structure, and a pressure detection structure. When the pressure of the medium flowing in the medium flow cavity group is too high, the pressure detection structure is subjected to the high pressure of the medium and controls the clamping structure to press the tympanic membrane downward through the linkage structure. The clamping structure supports and blocks the upper side of the tympanic membrane, so that the medium will no longer pass through the tympanic membrane, thereby reducing the damage of the medium to the tympanic membrane and subsequent structures.

[0025] The present invention cooperates with components such as a reset pull rod and a reset telescopic rod. After the pressure in the medium flow chamber group returns to normal, the reset pull rod is pulled upward to drive the linkage rod to pull the linkage rope upward, driving the retaining frame to move out of the upper end position of the double-rod penetration frame, and then the reset telescopic rod is pulled upward to drive the double-rod penetration frame to move upward, and then the reset pull rod and the reset telescopic rod are released in sequence to allow the retaining frame to support the double-rod penetration frame again, so that the pressure detection head is released from the pressure on the tympanic membrane, so that the medium can continue to flow in the medium flow chamber group.

[0026] The present invention provides components such as an arc-shaped baffle and a control rod. After the baffle is separated from the support of the double-rod penetrating frame, the double-rod penetrating frame moves downward under the elastic connection with the end cover. The round rod part of the double-rod penetrating frame applies a thrust to the upper arc surface of the arc-shaped baffle, so that the arc-shaped baffle rotates, and the double-rod penetrating frame moves to the lower side of the horizontal part of the arc-shaped baffle. At this time, the clamping ring column presses the eardrum, and the double-rod penetrating frame stably presses the clamping ring column against the eardrum under the obstruction of the horizontal part of the arc-shaped baffle. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 1 is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 2 is a schematic diagram of the structure inside the valve body according to an embodiment of the present invention; Figure 3 is a schematic diagram of the structure inside the protective cover in an embodiment of the present invention; Figure 4 This is a structural diagram of the connection between the valve body and the pressure detection structure in an embodiment of the present invention; Figure 5 This is a schematic structural diagram of the connection between the end cover and the cylinder in an embodiment of the present invention; Figure 6 2 is a schematic structural diagram of the connection between the compression ring column and the double-rod through-frame in an embodiment of the present invention; Figure 7 It is a schematic front view of part of the structure in an embodiment of the present invention; Figure 8 2 is a schematic diagram of the structure of the connection between the cylinder and the eardrum membrane in an embodiment of the present invention; Figure 9 In the embodiment of the present invention Figure 3 A magnified schematic diagram of the structure in the middle.

[0028] Figure numerals: 1. Valve body; 2. Tympanic membrane; 3. Medium flow cavity group; 31. Inlet hole; 32. Outlet hole; 33. Annular cavity; 4. Connecting structure; 41. Cylinder; 42. End cover; 5. Pressure detection structure; 51. Closing cylinder; 52. Pressure detection head; 53. Pressure regulating cylinder; 6. Clamping structure; 61. Clamping ring column; 62. Double-rod through-frame; 621. Reset telescopic rod; 622. Long axis; 623. Control rod; 624. Arc baffle; 63. Baffle frame; 7. Linkage structure; 71. Linkage rod; 72. Linkage rope; 73. Reset pull rod; 8. Protective cover. DETAILED DESCRIPTION

[0029] The following is combined with Figures 1-9 The present invention is described in further detail.

[0030] The embodiment of the present invention discloses a protective structure for a mine electromagnetic pilot valve. Figures 1-9As shown, it includes a valve body 1, a medium flow chamber group 3 is opened inside the valve body 1, and the medium flow chamber group 3 includes an inlet hole 31 and an outlet hole 32. The inlet hole 31 and the outlet hole 32 are coaxially opened inside the valve body 1, and the inlet hole 31 and the outlet hole 32 are connected to the outside of the valve body 1 at one end away from each other. The outlet hole 32 is located inside the valve body 1 and is bent upward. An annular cavity 33 is opened inside the valve body 1 and is coaxial with the upward bent end of the outlet hole 32. The inlet hole 31 is connected to the inside of the annular cavity 33.

[0031] An electromagnetic coil is installed in the valve body 1. The valve body 1 is provided with a liquid cavity inside the electromagnetic coil. The liquid cavity is connected with the annular cavity 33. A mounting bolt is threaded through the top wall of the liquid cavity. A fine hole connected with the outflow hole 32 is opened on the bottom wall of the liquid cavity. A magnet plug is slidably inserted in the liquid cavity. The magnet plug can seal the fine hole. The lower end of the mounting bolt and the magnet plug are elastically connected by a spring. The pressure of the spring can push the magnet plug to seal the fine hole. When the electromagnetic coil is energized, the magnetic force generated can drive the magnet plug to compress the spring upward.

[0032] A tympanic membrane 2 with openings for controlling the flow of liquid is provided inside the medium flow cavity group 3. The tympanic membrane 2 is made of annular deformable material around it, so that the tympanic membrane 2 can move up and down. The tympanic membrane 2 is installed inside the valve body 1 through a connecting structure 4. The tympanic membrane 2 is elastically connected to the connecting structure 4. The tympanic membrane 2 has a tendency to seal downward under the elastic connection. The valve body 1 is equipped with a pressure detection structure 5 that can move up and down when subjected to pressure. The pressure detection structure 5 is connected to the medium flow cavity group 3. After the pressure in the medium flow cavity group 3 increases, the detection structure in the pressure detection structure 5 can move upward under the medium pressure. A clamping structure 6 that can move up and down is provided on the upper side of the tympanic membrane 2.

[0033] The tympanic membrane 2 is coaxially located inside the annular cavity 33. The tympanic membrane 2 has one end bent upward to seal the outflow hole 32. The tympanic membrane 2 can bend one end upward toward the outflow hole 32 under elastic pressure. The material of the part of the tympanic membrane 2 that blocks the outflow hole 32 is not easily deformed, so that the tympanic membrane 2 can stably seal the outflow hole 32. The clamping structure 6 and the connecting structure 4 are both located inside the annular cavity 33, and the pressure detection structure 5 is connected to the inlet hole 31.

[0034] A linkage structure 7 is provided on the upper side of the valve body 1 , and the pressure detection structure 5 controls the pressing structure 6 to move up and down through the linkage structure 7 .

[0035] A protective cover 8 is installed on the upper surface of the valve body 1. The linkage structure 7, pressure detection structure 5, connection structure 4 and compression structure 6 are all located inside the protective cover 8. The protective cover 8 prevents external dust from adhering to the surface of the structure and hindering the movement between the structures.

[0036] The pressure detection structure 5 comprises a closed cylinder 51 and a pressure detection head 52. The closed cylinder 51 is installed inside the valve body 1 and connected with the valve body 1 by bolts, so that the closed cylinder 51 can be detached from the valve body 1. The upper end of the closed cylinder 51 is in communication with the outside of the valve body 1. A pressure regulating cylinder 53 is screwed through the upper end of the closed cylinder 51. The lower end of the pressure regulating cylinder 53 is elastically connected with the upper end of the pressure detection head 52, preferably by a spring, which tends to push the pressure detection head 52 to the lowermost end of the closed cylinder 51. The lower end of the closed cylinder 51 is in communication with the inflow hole 31. Rotating the pressure regulating cylinder 53 engaged with the closed cylinder 51 can adjust the initial elastic pressure on the pressure detection head 52, and the medium pressure required to push the pressure detection head 52.

[0037] The connecting structure 4 comprises a cylinder 41 and an end cover 42. The end cover 42 is installed on the upper end of the cylinder 41 and is attached to the upper surface of the valve body 1. The cylinder 41 is screwedly inserted into the ring cavity 33. The cylinder 41 can be detached from the ring cavity 33 by screwing relative to the ring cavity 33. The tympanic membrane 2 is coaxially installed on the lower end of the cylinder 41. The upper surface of the axis of the tympanic membrane 2 is elastically connected with the bottom surface of the end cover 42. The axis of the tympanic membrane 2 is connected with the end cover 42 by a spring, which tends to push the tympanic membrane 2 to coaxially block the upwardly bent end of the outflow hole 32. The end cover 42 is located inside the protective cover 8.

[0038] The pressing structure 6 comprises a pressing ring column 61 and a double-rod frame 62. The double-rod frame 62 is slidably inserted through the upper surface of the end cover 42 and fixed to the upper surface of the pressing ring column 61. The pressing ring column 61 is adapted to be located inside the cylinder 41. The double-rod frame 62 is elastically connected with the upper surface of the end cover 42 by a spring, which tends to pull the double-rod frame 62 to move downward. The double-rod frame 62 is composed of a horizontal rod and two vertical rods. The horizontal rod is connected with the upper ends of the two vertical rods by a nut. The spring is located in the vertical rod part of the double-rod frame 62 and connected with the end cover 42 and the horizontal rod part of the double-rod frame 62 at both ends.

[0039] The upper end of the double-rod frame 62 is provided with a circular rod-shaped part at the middle position. The lower side of the circular rod-shaped part of the double-rod frame 62 is provided with a blocking frame 63. The blocking frame 63 can be horizontally slidably connected with the upper surface of the end cover 42. The blocking frame 63 can horizontally slide relative to the end cover 42. The end of the blocking frame 63 away from the pressure detection structure 5 is composed of a plurality of rod-shaped structures. The end of the rod-shaped structure of the blocking frame 63 away from the pressure detection structure 5 is provided with a right-angled triangle with an inclined bottom surface. When the pressure in the medium flow cavity group 3 is normal, the rod-shaped structure of the blocking frame 63 can support the lower end of the horizontal rod part of the double-rod frame 62. The pressing ring column 61 does not press the tympanic membrane 2. The blocking frame 63 is connected with the linkage structure 7. The double-rod frame 62 is located inside the protective cover 8.

[0040] A reset telescopic rod 621 is inserted and installed in the middle position of the upper end of the double-rod frame 62. The reset telescopic rod 621 slides through and is installed on the inner top wall of the protective cover 8. When the blocking frame 63 disengages from supporting the double-rod frame 62 and the reset telescopic rod 621 reaches the maximum telescopic amount, the clamping ring column 61 just contacts and supports the eardrum 2. The clamping ring column 61 will not apply pressure to the eardrum 2, causing damage to the eardrum 2, and the maximum distance the clamping ring column 61 moves downward is limited.

[0041] The upper end of the pressure detection head 52 is connected to the linkage structure 7 , and the linkage structure 7 is slidably arranged on the axis of the pressure regulating cylinder 53 . The sealing cylinder 51 and the pressure regulating cylinder 53 are both located inside the protective cover 8 .

[0042] The linkage structure 7 includes a linkage rod 71 and a linkage rope 72. The two ends of the linkage rope 72 are respectively fixed to the linkage rod 71 and the blocking frame 63. The upper surface of the end cover 42 is slidably sleeved on the outer surface of the linkage rope 72. The upper end of the linkage rod 71 is horizontally bent toward one end of the blocking frame 63, and the other end of the linkage rod 71 is vertically arranged.

[0043] The vertical end of the linkage rod 71 is passed through the axis of the pressure regulating cylinder 53, and the lower end of the linkage rod 71 is fixed to the upper surface of the pressure detection head 52. The retaining frame 63 is horizontally elastically connected to the end cover 42. The linkage rod 71 and the linkage rope 72 are located inside the protective cover 8. When the pressure detection head 52 moves upward due to the medium pressure, the linkage rod 71 moves upward with the pressure detection head 52 and pulls the linkage rope 72. The linkage rope 72 pulls the retaining frame 63 to move horizontally. When the medium pressure is large enough to drive the linkage rod 71 to move a certain distance, the retaining frame 63 can be driven to detach from the lower side of the horizontal bar part of the double-rod frame 62 by pulling the linkage rope 72.

[0044] A reset rod 73 is fixed to the upper vertical end of the linkage rod 71, and the upper end of the reset rod 73 slides through the inner top wall of the protective cover 8. By pulling the reset rod 73, the linkage rod 71 can be actively pulled to drive the blocking frame 63 to separate from the double-rod frame 62, without hindering the up and down movement of the double-rod frame 62.

[0045] Two long shafts 622 are symmetrically arranged on the lower side of the upper end of the double-rod frame 62. The two ends of the long shaft 622 rotate and pass through the inside of the protective cover 8. One end of the long shaft 622 is elastically connected to the protective cover 8, and the other end of the long shaft 622 is located outside the protective cover 8 and a control rod 623 is installed at one end.

[0046] The outer surface of the long shaft 622 is fixedly sleeved with an arc baffle 624, the upper surface of the arc baffle 624 is an arc surface, and the bottom surface of the arc baffle 624 away from the long shaft 622 is a horizontal surface. The elastic connection between the two long shafts 622 and the protective cover 8 has a tendency to drive the arc baffles 624 on both sides to contact each other. When the double-rod penetrating frame 62 moves downward, the round rod end of the crossbar part of the double-rod penetrating frame 62 contacts the arc surface of the arc baffle 624 and applies thrust, which can push the arc baffles 624 on both sides to rotate away from each other, so that the crossbar part of the double-rod penetrating frame 62 can move to the lower side of the horizontal part of the arc baffle 624, and then the arc baffle 624 The horizontal part blocks the double-rod penetrating frame 62, so that the clamping ring column 61 is stably at the bottom. The arc baffle 624 is located on the lower side of the round rod part at the upper end of the double-rod penetrating frame 62. The arc baffle 624 and the rod-shaped structure of the baffle 63 are staggered. After the medium pressure in the medium flow chamber group 3 is restored, the control rod 623 is manually toggled to drive the two long axes 622 to rotate relative to each other, so that the two symmetrical arc baffles 624 rotate away from each other, and then the resetting telescopic rod 621 is pulled upward, and at the same time, the baffle 63 is pulled out of the position of the double-rod penetrating frame 62, and the double-rod penetrating frame 62 is controlled to move back to the upper side of the baffle 63, so that the baffle 63 can be re-aligned between the double-rod penetrating frames 62.

[0047] The working principle is: the medium fluid flows in the medium flow cavity group 3, and the medium fluid can pass through the openings opened on the surface of the tympanic membrane 2. When the pressure of the medium flowing in the medium flow cavity group 3 is too large, the pressure detection structure 5 is subjected to the high pressure of the medium and controls the clamping structure 6 to press the tympanic membrane 2 downward through the linkage structure 7. The clamping structure 6 supports and blocks the upper side of the tympanic membrane 2, so that the medium will no longer pass through the tympanic membrane 2, and the high-pressure medium will no longer cause damage to the tympanic membrane 2 and the structure inside the valve body 1.

[0048] The above are all preferred embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A protective structure for a mine electromagnetic pilot valve, comprising a valve body (1), characterized in that: The valve body (1) is provided with a medium flow cavity group (3) inside, and a tympanic membrane (2) with an opening and controlling the flow of liquid is provided inside the medium flow cavity group (3), the tympanic membrane (2) is installed inside the valve body (1) via a connecting structure (4), the tympanic membrane (2) and the connecting structure (4) are elastically connected, the valve body (1) is provided with a pressure detection structure (5) that can move up and down when subjected to pressure, the pressure detection structure (5) is communicated with the medium flow cavity group (3), and a pressing structure (6) that can move up and down is provided on the upper side of the tympanic membrane (2); A linkage structure (7) is provided on the upper side of the valve body (1), and the pressure detection structure (5) controls the pressing structure (6) to move up and down through the linkage structure (7).

2. A mining electromagnetic pilot valve protection structure according to claim 1, characterized in that: The medium flow cavity group (3) includes an inlet hole (31) and an outlet hole (32), the inlet hole (31) and the outlet hole (32) are coaxially arranged inside the valve body (1), the inlet hole (31) and the outlet hole (32) are both connected to the outside of the valve body (1) at one end away from each other, the outlet hole (32) is located inside the valve body (1) and is bent upward at one end, and an annular cavity (33) is provided inside the valve body (1) and is coaxially arranged with the end of the outlet hole (32) bent upward, and the inlet hole (31) is connected to the inside of the annular cavity (33); The tympanic membrane (2) is coaxially located inside the annular cavity (33), and one end of the tympanic membrane (2) is bent upward to seal the outflow hole (32). The pressing structure (6) and the connecting structure (4) are both located inside the annular cavity (33), and the pressure detection structure (5) is connected to the inflow hole (31).

3. A protective structure for a mine electromagnetic pilot valve according to claim 2, characterized in that: A protective cover (8) is installed on the upper surface of the valve body (1), and the linkage structure (7), the pressure detection structure (5), the connection structure (4) and the pressing structure (6) are all located inside the protective cover (8).

4. A protective structure for a mine electromagnetic pilot valve according to claim 3, characterized in that: The pressure detection structure (5) comprises a closing cylinder (51) and a pressure detection head (52), the closing cylinder (51) being installed inside the valve body (1), the upper end of the closing cylinder (51) being communicated with the outside of the valve body (1), a pressure regulating cylinder (53) being threadedly passed through the upper end of the closing cylinder (51), the lower end of the pressure regulating cylinder (53) being elastically connected to the upper end of the pressure detection head (52), and the lower end of the closing cylinder (51) being communicated with the inlet hole (31); The upper end of the pressure detection head (52) is connected to the linkage structure (7), and the linkage structure (7) is slidably arranged on the axis of the pressure regulating cylinder (53). The sealing cylinder (51) and the pressure regulating cylinder (53) are both located inside the protective cover (8).

5. A protective structure for a mine electromagnetic pilot valve according to claim 4, characterized in that: The connecting structure (4) includes a cylinder (41) and an end cover (42), wherein the end cover (42) is mounted on the upper end of the cylinder (41), and the end cover (42) is fitted on the upper surface of the valve body (1). The cylinder (41) is threadedly inserted into the annular cavity (33), and the tympanic membrane (2) is coaxially mounted on the lower end of the cylinder (41). The upper surface of the tympanic membrane (2) at the axis is elastically connected to the bottom surface of the end cover (42), and the end cover (42) is located inside the protective cover (8).

6. A mine electromagnetic pilot valve protection structure according to claim 5, characterized in that: The clamping structure (6) includes a clamping ring column (61) and a double-rod penetrating frame (62). The double-rod penetrating frame (62) slides through the upper surface of the end cover (42) and is fixed to the upper surface of the clamping ring column (61). The clamping ring column (61) is adapted to be located inside the cylinder (41). The double-rod penetrating frame (62) is elastically connected to the upper surface of the end cover (42). The middle position of the upper end of the double-rod penetrating frame (62) is set to a round rod shape, and a retaining frame (63) is set on the lower side of the round rod-shaped part of the double-rod penetrating frame (62). The retaining frame (63) and the upper surface of the end cover (42) can be connected to each other in a transverse sliding manner. The retaining frame (63) is connected to the linkage structure (7), and the double-rod penetrating frame (62) is located inside the protective cover (8).

7. A protective structure for a mine electromagnetic pilot valve according to claim 6, characterized in that: The end of the retaining frame (63) away from the pressure detection structure (5) is composed of a plurality of rod-shaped structures, and the end of the rod-shaped structure of the retaining frame (63) away from the pressure detection structure (5) is provided with a right triangle with an inclined bottom surface.

8. A mining electromagnetic pilot valve protection structure according to claim 6 or 7, characterized in that: The linkage structure (7) includes a linkage rod (71) and a linkage rope (72), the two ends of the linkage rope (72) are respectively fixed to the linkage rod (71) and the retaining frame (63), the upper surface of the end cover (42) is slidably sleeved on the outer surface of the linkage rope (72), the upper end of the linkage rod (71) is horizontally bent toward one end of the retaining frame (63), and the other end of the linkage rod (71) is vertically arranged; The vertical end of the linkage rod (71) is passed through the axis of the pressure regulating cylinder (53), the lower end of the linkage rod (71) is fixed to the upper surface of the pressure detection head (52), the retaining frame (63) is elastically connected to the end cover (42) horizontally, and the linkage rod (71) and the linkage rope (72) are located inside the protective cover (8); A reset pull rod (73) is fixed to the upper end of the vertical end of the linkage rod (71), and the upper end of the reset pull rod (73) slides through the inner top wall of the protective cover (8).

9. The protective structure of a mine electromagnetic pilot valve according to claim 7, characterized in that: A reset telescopic rod (621) is inserted and installed at the middle position of the upper end of the double-rod through-frame (62), and the reset telescopic rod (621) is slidably installed through the inner top wall of the protective cover (8).

10. A protective structure for a mine electromagnetic pilot valve according to claim 9, characterized in that: Two long shafts (622) are symmetrically arranged on the lower side of the upper end of the double-rod through-frame (62), and both ends of the long shafts (622) rotate and penetrate the interior of the protective cover (8). One end of the long shaft (622) is elastically connected to the protective cover (8), and the other end of the long shaft (622) is located outside the protective cover (8) and is equipped with a control rod (623). The outer surface of the long axis (622) is fixedly sleeved with an arc-shaped baffle (624), the upper surface of the arc-shaped baffle (624) is an arc surface, the bottom surface of the arc-shaped baffle (624) away from the long axis (622) is a horizontal surface, the arc-shaped baffle (624) is located on the lower side of the round rod portion at the upper end of the double-rod through-frame (62), and the arc-shaped baffle (624) and the rod-shaped structure of the baffle frame (63) are staggered. The arc-shaped baffles (624) provided on the surfaces of the two long axes (622) are symmetrically distributed one by one with the double-rod penetrating frame (62).

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