Mining safety valve

Abstract

The mining safety valve is characterized in that at least one spiral guide line which extends in the length direction and is screwed by 1-10 degrees in the circumferential direction is arranged on the inner wall of one section, close to an oil outlet section, of an oil inlet section, and at least one straight guide line which extends in the length direction is arranged on the inner wall of the oil outlet section; the plug sealing section is columnar and is in sliding fit with the oil outlet section, and the plug guiding section and the oil inlet section are arranged in a split and combined mode. According to the mining safety valve provided by the invention, the spiral guide line is arranged on the valve body, and the spiral matching guide line is arranged on the valve body, so that the impact energy of the movable plug in the axial direction is counteracted by the friction force between the spiral guide line and the spiral matching guide line, and the movable plug and the valve body are further protected; and when the spiral guide line is just matched with the spiral matching guide line, the straight guide line is just separated from the straight matching guide line, so that the straight guide line and the straight matching guide line can realize rotation limitation of the movable plug at part of positions and realize rotation release of the movable plug at part of positions.

Description

Technical Field

[0001] The invention relates to the field of hydraulic valves, and in particular to a safety valve for mining. Background Art

[0002] The mine safety valve is a safety protection device specially designed for the mining industry. Its main function is to prevent explosions or destructive accidents caused by excessive pressure inside the mine. This safety valve is usually installed on the ventilation system or key equipment of the mine to ensure the safe operation of the entire mine. When the pressure inside the mine accumulates to a preset safety threshold, the safety valve will automatically start and quickly open to release the excessive pressure, thereby effectively avoiding damage to the internal structure of the mine or casualties caused by excessive pressure, ensuring the stability of the internal environment of the mine and the safety of the miners.

[0003] The structure of a general safety valve is similar to that of a one-way valve, and the pressure relief effect is achieved through the cooperation of a piston and a coil spring. For example, when the oil pressure exceeds the elastic force provided by the coil spring, the piston is driven by the oil pressure to complete the pressure relief process; when the oil pressure is less than the elastic force provided by the coil spring, the piston is driven back to its original position by the coil spring to stop the pressure relief process. During the operation of the piston, especially when the coil spring resets the piston, it is susceptible to large impacts. In some scenarios, soft seals cannot meet the use conditions, are easily damaged by impacts, and are also prone to aging problems. Summary of the invention

[0004] The main purpose of the present invention is to provide a mining safety valve, aiming to solve the problem that the piston of the safety valve is subjected to a large impact during operation and has the hidden danger of damage.

[0005] In order to achieve the above object, the present invention provides a mining safety valve, comprising:

[0006] The valve body is cylindrical and has a channel running through the middle, the channel includes an oil inlet section and an oil outlet section connected to each other, the oil inlet section is located at the front end, the oil outlet section is located at the rear end and has an inner diameter larger than the oil inlet section, the oil outlet section is provided with an oil outlet hole, at least one spiral guide line extending in the length direction and screwed in 1 to 10 degrees in the circumferential direction is provided on the inner wall of the oil inlet section near the oil outlet section, and at least one straight guide line extending in the length direction is provided on the inner wall of the oil outlet section;

[0007] A movable plug, comprising a plug guide section and a plug sealing section connected to each other, the plug sealing section being columnar and forming a sliding fit with the oil outlet section, the plug guide section and the oil inlet section being arranged separately and together, a spiral matching guide line being arranged on the outer wall of the plug guide section corresponding to the spiral guide line, and a straight matching guide line being arranged on the outer wall of the plug sealing section corresponding to the straight guide line, wherein when the spiral guide line just matches with the spiral matching guide line, the straight guide line and the straight matching guide line are just separated;

[0008] A sealing cover connected to and closing the rear end of the valve body;

[0009] a coil spring compressed between the cover and the movable plug;

[0010] When the movable plug slides in the valve body, the oil outlet hole is closed and released.

[0011] Furthermore, the end face of the plug sealing section is provided with a rod hole which is a blind hole at the central axis position, the inner end of the cover is provided with a spring rod which extends into the rod hole, the coil spring is sleeved on the spring rod, and the spring rod and the rod hole are clearance-matched in the circumferential direction, wherein when the movable plug slides, the spring rod and the rod hole are always matched.

[0012] Furthermore, a rod hole which is a blind hole is provided on the end face of the plug sealing section at the central axis position, a spring rod which extends into the rod hole is provided at the inner end of the cover, the coil spring is sleeved on the spring rod, and the spring rod and the rod hole are clearance-matched in the circumferential direction, wherein the spring rod is matched with the rod hole only when the movable plug is separated from the oil inlet section and the oil outlet hole is released.

[0013] Furthermore, the plug guide section on the movable plug is in the shape of a cone with the free end being the top, and the position of the oil inlet section corresponding to the plug guide section is also in the shape of a cone, wherein the angle between the peripheral wall of the plug guide section and the central axis is 85 to 89 degrees, and the dimensions of the spiral guide line and the spiral matching guide line in their own height direction are uniform.

[0014] Furthermore, the sealing cover is threadedly connected to the valve body.

[0015] Furthermore, two ends of the coil spring are respectively connected to the movable plug and the sealing cover.

[0016] Furthermore, there are multiple oil outlet holes, which are evenly arranged around the valve body.

[0017] Furthermore, the number of the spiral guide wires is multiple and they are evenly spaced in the circumferential direction of the valve body.

[0018] Furthermore, the spiral guide wire is a groove-shaped structure, and the spiral matching guide wire is a protruding structure.

[0019] Furthermore, the oil outlet hole is arranged at one end of the oil outlet section in the length direction of the oil outlet section close to the oil inlet section.

[0020] The mining safety valve provided by the present invention has a spiral guide wire arranged on the valve body and a spiral matching guide wire arranged on the top, so that the impact energy of the movable plug in the axial direction can be offset by the friction between the spiral guide wire and the spiral matching guide wire, thereby protecting the movable plug and the valve body; when the spiral guide wire just matches with the spiral matching guide wire, the straight guide wire and the straight matching guide wire are just separated, so that the straight guide wire and the straight matching guide wire can realize the rotation restriction of the movable plug in some positions, and realize the rotation release of the movable plug in some positions. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a cross-sectional schematic diagram of a valve body in a mining safety valve in a first embodiment of the present invention;

[0022] Figure 2 1 is a cross-sectional schematic diagram of a movable plug in a mining safety valve according to a first embodiment of the present invention (first viewing angle);

[0023] Figure 3 1 is a cross-sectional schematic diagram of a movable plug in a mining safety valve according to a first embodiment of the present invention (second viewing angle);

[0024] Figure 4 1 is a cross-sectional schematic diagram of a mining safety valve according to a first embodiment of the present invention (closed state);

[0025] Figure 5 1 is a cross-sectional schematic diagram of a mining safety valve according to a first embodiment of the present invention (a straight guide wire and a straight matching guide wire are just combined);

[0026] Figure 6 1 is a cross-sectional schematic diagram of a mining safety valve according to a first embodiment of the present invention (a straight guide wire and a straight matching guide wire are combined);

[0027] Figure 7 It is a cross-sectional schematic diagram of a mining safety valve according to a second embodiment of the present invention (a straight guide wire and a straight matching guide wire are just combined).

[0028] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0029] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0030] Those skilled in the art will appreciate that, unless expressly stated otherwise, the singular forms "a", "an", "said", "above", and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of the features, integers, steps, operations, elements, units, modules, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, units, modules, components, and / or groups thereof. It should be understood that when we refer to an element as being "connected" or "coupled" to another element, it may be directly connected or coupled to the other element, or there may be intermediate elements. In addition, the "connection" or "coupling" used herein may include wireless connection or wireless coupling. The term "and / or" used herein includes all or any unit and all combinations of one or more associated listed items.

[0031] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as generally understood by those skilled in the art in the art to which the present invention belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless specifically defined as herein.

[0032] Reference Figures 1 to 7 In one embodiment of the present invention, a mining safety valve comprises:

[0033] The valve body 100 is cylindrical and has a channel running through the middle. The channel includes an oil inlet section 110 and an oil outlet section 120 connected to each other. The oil inlet section 110 is located at the front end, and the oil outlet section 120 is located at the rear end and has an inner diameter larger than the oil inlet section 110. The oil outlet section 120 is provided with an oil outlet hole 121. At least one spiral guide line 111 extending in the length direction and screwed in 1 to 10 degrees in the circumferential direction is provided on the inner wall of the oil inlet section 110 near the oil outlet section 120. At least one straight guide line 122 extending in the length direction is provided on the inner wall of the oil outlet section 120.

[0034] The movable plug 200 comprises a plug guide section 210 and a plug sealing section 220 connected to each other. The plug sealing section 220 is columnar and forms a sliding fit with the oil outlet section 120. The plug guide section 210 and the oil inlet section 110 are arranged in a split manner. A spiral matching guide line 211 is arranged on the outer wall of the plug guide section 210 to match the spiral guide line 111. A straight matching guide line 221 is arranged on the outer wall of the plug sealing section 220 to match the straight guide line 122. When the spiral guide line 111 just matches with the spiral matching guide line 211, the straight guide line 122 is just separated from the straight matching guide line 221.

[0035] A sealing cover 300 connected to and sealing the rear end of the valve body 100;

[0036] A coil spring 400 compressed between the cover 300 and the movable stopper 200;

[0037] When the movable plug 200 slides in the valve body 100 , the oil outlet hole 121 is closed and released.

[0038] In the prior art, during the operation of the piston, especially when the coil spring resets the piston, it is susceptible to large impacts. The soft seal cannot meet the use conditions in some scenarios and is easily damaged by impacts and is also prone to aging problems.

[0039] The mining safety valve provided by the present invention comprises a valve body 100 , a movable plug 200 , a sealing cover 300 and a coil spring 400 .

[0040] The valve body 100 is cylindrical and has a channel running through the middle. The channel includes an oil inlet section 110 and an oil outlet section 120 that are connected to each other. The oil inlet section 110 is located at the front end, and the oil outlet section 120 is located at the rear end and has an inner diameter larger than the oil inlet section 110. The oil outlet section 120 is provided with an oil outlet hole 121. The oil inlet section 110 is the entry position of the high-pressure oil, and the oil outlet hole 121 on the oil outlet section 120 is the pressure relief position of the high-pressure oil. The number of oil outlet holes 121 is not limited to one, and a hooking structure can be provided between multiple oil outlet holes 121 to improve the smoothness of the work. On the inner wall of a section of the oil inlet section 110 near the oil outlet section 120, at least one spiral guide wire 111 extending in the length direction and screwing in 1 to 10 degrees in the circumferential direction is provided. On the inner wall of the oil outlet section 120, at least one straight guide wire 122 extending in the length direction is provided. The spiral guide wire 111 is a spiral wire structure, but can be a groove structure or a protrusion structure on the inner wall of the oil inlet section 110. And the straight guide wire 122 is a linear structure, specifically a groove structure or a protrusion structure. The processing of the spiral guide wire 111 and the straight guide wire 122 can be achieved by integral molding or post-processing.

[0041] The movable plug 200 includes a plug guide section 210 and a plug sealing section 220 which are connected to each other. The plug sealing section 220 is columnar and forms a sliding fit with the oil outlet section 120. When the movable plug 200 slides based on the plug sealing section 220, the plug guide section 210 of the movable plug 200 is separated and combined with the oil inlet section 110. A spiral matching guide line 211 is matched with the spiral guide line 111 on the outer wall of the plug guide section 210, and a straight matching guide line 221 is matched with the straight guide line 122 on the outer wall of the plug sealing section 220. When the spiral guide line 111 just matches with the spiral matching guide line 211, the straight guide line 122 and the straight matching guide line 221 are just separated. In a working process, when the plug guide section 210 of the movable plug 200 just combines with the oil inlet section 110 of the valve body 100, the spiral guide line 111 also just matches with the spiral matching guide line 211.

[0042] The circumferential screwing angle of the spiral guide wire 111 and the spiral matching guide wire 211 is relatively small, for example, 1, 2, 3 or 8 degrees; therefore, during the separation and combination of the plug guide section 210 of the movable plug 200 and the oil inlet section 110, the combination between the spiral guide wire 111 and the spiral matching guide wire 211 will not generate excessive resistance, thereby affecting the operation of the safety valve.

[0043] The cover 300 is connected to and closes the rear end of the valve body 100, providing a basis for the operation of the oil outlet section 120. The connection between the cover 300 and the valve body 100 can be a threaded connection or the like.

[0044] The coil spring 400 is compressed between the cover 300 and the movable plug 200. The working pressure of the mine safety valve can be adjusted by selecting the stiffness coefficient of the coil spring 400. When the movable plug 200 slides in the valve body 100, the oil outlet hole 121 is closed and released. When the working pressure of the high-pressure oil cannot overcome the elastic force of the coil spring 400, the entire mine safety valve will not open; when the working pressure of the high-pressure oil overcomes the coil spring 400 and presses the movable plug 200 downward, the pressure relief process can be completed at the oil outlet hole 121.

[0045] During operation, after the safety valve is assembled, the front end of the valve body 100 is connected to the pipeline. When the pressure of the high-pressure oil does not exceed the working pressure, the movable plug 200, under the action of the coil spring 400, isolates the valve body 100, so that the oil outlet 121 is also closed.

[0046] When the pressure of the high-pressure oil exceeds the working pressure, the active plug 200 is pressed down and twisted until the oil outlet 121 is released by the active plug 200. At this time, the spiral spring 400 is compressed, and the meshing effect between the spiral guide wire 111 and the spiral matching guide wire 211 during the twisting process of the active plug 200 introduces a certain friction force to form a buffer to prevent the active plug 200 from being damaged by excessive impact. When the active plug 200 is pressed down and twisted, and the spiral guide wire 111 and the spiral matching guide wire 211 are about to be separated, the straight guide wire 122 and the straight matching guide wire 221 are just matched. At this time, the rotation of the active plug 200 is restricted, and it can continue to be pressed down by the high-pressure oil.

[0047] When the pressure of the high-pressure oil drops again and is lower than the working pressure again, the movable plug 200 moves toward the direction of the oil inlet section 110 under the action of the coil spring 400. During the movement of the front section, due to the action of the straight guide wire 122 and the straight matching guide wire 221, the movable plug 200 will not rotate. When the straight guide wire 122 and the straight matching guide wire 221 are just separated, the spiral guide wire 111 is just matched with the spiral matching guide wire 211. During the movement of the rear section, the movable plug 200 rotates, and the meshing between the spiral guide wire 111 and the spiral matching guide wire 211 generates friction, and the impact of the movable plug 200 is offset by the generation of the above friction.

[0048] In summary, by providing a spiral guide wire 111 on the valve body 100 and a spiral mating guide wire 211 thereon, the axial impact energy of the movable plug 200 can be offset by the friction between the spiral guide wire 111 and the spiral mating guide wire 211, thereby protecting the movable plug 200 and the valve body 100; when the spiral guide wire 111 just engages with the spiral mating guide wire 211, the straight guide wire 122 and the straight mating guide wire 221 are just separated, so that the straight guide wire 122 and the straight mating guide wire 221 can realize the rotation restriction of the movable plug 200 in some positions, and realize the rotation release of the movable plug 200 in some positions.

[0049] Reference Figures 1 to 6 In one embodiment, the end face of the plug sealing section 220 is provided with a rod hole 222 which is a blind hole at the central axis position, the inner end of the cover 300 is provided with a spring rod 310 which extends into the rod hole 222, the coil spring 400 is sleeved on the spring rod 310, and the spring rod 310 and the rod hole 222 are clearance-matched in the circumferential direction, wherein when the movable plug 200 slides, the spring rod 310 and the rod hole 222 are always matched.

[0050] In this embodiment, during the working process of the movable plug 200, when the movable plug 200 is pressed down by the pressure oil and pushed up by the spring rod 310, the gap between the rod hole 222 and the spring rod 310 serves as an oil outlet position to form a damping effect, thereby protecting the structure of the movable plug 200. The above arrangement is more suitable for the case where the working pressure of the mining safety valve is low.

[0051] Reference Figure 7 In one embodiment, the end face of the plug sealing section 220 is provided with a blind rod hole 222 at the central axis position, the inner end of the cover 300 is provided with a spring rod 310 extending into the rod hole 222, the coil spring 400 is sleeved on the spring rod 310, and the spring rod 310 and the rod hole 222 are clearance-matched in the circumferential direction, wherein the spring rod 310 is matched with the rod hole 222 only when the movable plug 200 is separated from the oil inlet section 110 and the oil outlet hole 121 is released.

[0052] In this embodiment, during the working process of the movable plug 200, when the movable plug 200 is pressed down by the pressure oil and the oil outlet hole 121 is not exposed, the rod hole 222 and the spring rod 310 have not yet formed a damping effect, so that the movable plug 200 responds quickly. When the movable plug 200 continues to slide, the spring rod 310 is matched with the rod hole 222 to form a damping effect, thereby preventing the movable plug 200 from being subjected to excessive impact; when the movable plug 200 is pushed up by the spiral spring 400, when the spiral guide wire 111 has not yet formed a match with the spiral matching guide wire 211, the damping effect between the spring rod 310 and the rod hole 222 forms a buffer. After the spring rod 310 is separated from the rod hole 222, the matching between the spiral guide wire 111 and the spiral matching guide wire 211 forms a buffer. Through the above settings, while forming a rapid pressure relief response, the buffer effect can be achieved in the rest of the process, thereby protecting the movable plug 200. The above settings are applicable when the working pressure of the mining safety valve is relatively high.

[0053] In one embodiment, the plug guide section 210 on the movable plug 200 is in a frustum shape with the free end being the top, and the position of the oil inlet section 110 corresponding to the plug guide section 210 is also in a frustum shape, wherein the angle between the peripheral wall of the plug guide section 210 and the central axis is 85 to 89 degrees, and the dimensions of the spiral guide line 111 and the spiral matching guide line 211 in their own height direction are uniform.

[0054] In this embodiment, in order to improve the smoothness of the fitting of the spiral guide line 111 and the spiral matching guide line 211, the plug guide section 210 of the movable plug 200 is set to a frustum shape, and the position of the oil inlet section 110 on the valve body 100 corresponding to the plug guide section 210 is also set to a frustum shape; then when the movable plug 200 is combined with the oil inlet section 110 of the valve body 100, a clearance fit is initially formed in the circumferential direction, and thus the process of the movable plug 200 and the valve body 100 being combined is not prone to abnormalities, and the process of the spiral guide line 111 and the spiral matching guide line 211 forming a fit is also facilitated. Specifically, the taper of the above two frustum structures cannot be too large, otherwise the spiral guide line 111 and the spiral guide line 111 will not form a fit when the movable plug 200 slides into the oil section 110 in the initial process.

[0055] Reference Figures 1 to 6 In one embodiment, the sealing cover 300 is threadedly connected to the valve body 100 .

[0056] In this embodiment, the degree of compression of the coil spring 400 can be adjusted by rotating the cover 300, and thus the working pressure of the mine safety valve can be adjusted. A fixing structure can also be provided corresponding to the cover 300 to reduce the looseness between the cover 300 and the valve body 100.

[0057] In one embodiment, two ends of the coil spring 400 are connected to the movable stopper 200 and the sealing cover 300 respectively.

[0058] In this embodiment, by fixing both ends of the coil spring 400, the coil spring 400 assists the separation process by torsion elastic force during the separation process of the movable plug 200 and the oil inlet section 110, so as to avoid excessive resistance during the process of the hydraulic oil pressing down the movable plug 200, thereby failing to achieve the function of the safety valve. The above arrangement plays a greater auxiliary role when the circumferential precession angle of the spiral guide wire 111 is large.

[0059] In one embodiment, there are multiple oil outlet holes 121 , which are evenly arranged around the valve body 100 .

[0060] In this embodiment, the number of the oil outlet holes 121 is limited to multiple, and the hydraulic oil flows out of the valve body 100 more smoothly, which facilitates the pressure relief process. For example, the number of the oil outlet holes 121 is four, and they are arranged at 90 degrees.

[0061] In one embodiment, the spiral guide wires 111 are multiple in number and are evenly spaced in a circumferential direction of the valve body 100 .

[0062] In this embodiment, the number of spiral guide wires 111 is increased, and the number of spiral matching guide wires 211 is also increased accordingly; by increasing the number of spiral guide wires 111, the buffering effect on the active plug 200 is stronger and more uniform. In a specific implementation process, the number of spiral guide wires 111 is four, and they are evenly arranged around the periphery.

[0063] In one embodiment, the spiral guide wire 111 is a groove-shaped structure, and the spiral matching guide wire 211 is a protruding structure.

[0064] In this embodiment, the spiral guide line 111 on the valve body 100 is set as a groove structure, which can be easily produced by machine tool cutting; the spiral matching guide line 211 on the movable plug 200 is set as a protruding structure, which can be easily processed by casting or machine tools.

[0065] In one embodiment, the oil outlet hole 121 is disposed at one end of the oil outlet section 120 close to the oil inlet section 110 in the length direction.

[0066] In this embodiment, the position of the oil outlet hole 121 is edged, so that the length of the movable plug 200 can be reduced as much as possible.

[0067] In summary, the mining safety valve provided by the present invention, by arranging a spiral guide wire 111 on the valve body 100 and arranging a spiral matching guide wire 211 thereon, the impact energy of the movable plug 200 in the axial direction is offset by the friction between the spiral guide wire 111 and the spiral matching guide wire 211, thereby protecting the movable plug 200 and the valve body 100; when the spiral guide wire 111 is just matched with the spiral matching guide wire 211, the straight guide wire 122 is just separated from the straight matching guide wire 221, so that the straight guide wire 122 and the straight matching guide wire 221 can realize the rotation restriction of the movable plug 200 in some positions, and realize the rotation release of the movable plug 200 in some positions.

[0068] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A safety valve for mining, characterized in that: include: The valve body (100) is cylindrical and has a channel running through the middle, the channel comprising an oil inlet section (110) and an oil outlet section (120) connected to each other, the oil inlet section (110) being located at the front end, the oil outlet section (120) being located at the rear end and having an inner diameter larger than that of the oil inlet section (110), the oil outlet section (120) being provided with an oil outlet hole (121), at least one spiral guide line (111) extending in the length direction and screwing inward 1 to 10 degrees in the circumferential direction being provided on the inner wall of a section of the oil inlet section (110) near the oil outlet section (120), and at least one straight guide line (122) extending in the length direction being provided on the inner wall of the oil outlet section (120); A movable plug (200) comprises a plug guide section (210) and a plug sealing section (220) connected to each other, wherein the plug sealing section (220) is columnar and forms a sliding fit with the oil outlet section (120), the plug guide section (210) and the oil inlet section (110) are arranged in a separate and combined manner, a spiral matching guide line (211) is arranged on the outer wall of the plug guide section (210) corresponding to the spiral guide line (111) and a straight matching guide line (221) is arranged on the outer wall of the plug sealing section (220) corresponding to the straight guide line (122), wherein when the spiral guide line (111) just matches with the spiral matching guide line (211), the straight guide line (122) and the straight matching guide line (221) are just separated; A sealing cover (300) connected to and sealing the rear end of the valve body (100); A coil spring (400) compressed between the sealing cover (300) and the movable stopper (200); When the movable plug (200) slides in the valve body (100), the oil outlet hole (121) is closed and released.

2. The mining safety valve according to claim 1, characterized in that: The end surface of the plug sealing section (220) is provided with a blind rod hole (222) at the central axis position, the inner end of the cover (300) is provided with a spring rod (310) extending into the rod hole (222), the coil spring (400) is sleeved on the spring rod (310), and the spring rod (310) and the rod hole (222) are clearance-matched in the circumferential direction, wherein when the movable plug (200) slides, the spring rod (310) and the rod hole (222) are always matched.

3. The mining safety valve according to claim 1, characterized in that: The end surface of the plug sealing section (220) is provided with a blind rod hole (222) at the central axis position, the inner end of the cover (300) is provided with a spring rod (310) extending into the rod hole (222), the coil spring (400) is sleeved on the spring rod (310), and the spring rod (310) and the rod hole (222) are clearance-matched in the circumferential direction, wherein the spring rod (310) is matched with the rod hole (222) only when the movable plug (200) is separated from the oil inlet section (110) and the oil outlet hole (121) is released.

4. The mining safety valve according to claim 1, characterized in that: The plug guide section (210) on the movable plug (200) is in a frustum shape with the free end being the top, and the position of the oil inlet section (110) corresponding to the plug guide section (210) is also in a frustum shape, wherein the angle between the peripheral wall of the plug guide section (210) and the central axis is 85 to 89 degrees, and the dimensions of the spiral guide line (111) and the spiral matching guide line (211) in their own height direction are uniform.

5. The mining safety valve according to any one of claims 1 to 4, characterized in that: The sealing cover (300) is threadedly connected to the valve body (100).

6. The mining safety valve according to any one of claims 1 to 4, characterized in that: Both ends of the coil spring (400) are connected to the movable stopper (200) and the sealing cover (300) respectively.

7. The mining safety valve according to any one of claims 1 to 4, characterized in that: The oil outlet holes (121) are multiple in number and are evenly arranged around the valve body (100).

8. The mining safety valve according to any one of claims 1 to 4, characterized in that: The spiral guide wires (111) are multiple in number and are evenly spaced in the circumferential direction of the valve body (100).

9. The mining safety valve according to any one of claims 1 to 4, characterized in that: The spiral guide wire (111) is a groove-shaped structure, and the spiral matching guide wire (211) is a protruding structure.

10. The mining safety valve according to claim 1, characterized in that: The oil outlet hole (121) is arranged at one end of the oil outlet section (120) in the length direction close to the oil inlet section (110).

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