Coal mine underground explosion-proof equipment

Abstract

The utility model relates to a coal mine underground explosion-proof device which comprises a shock wave receiving portion, a gas storage chamber, a powder storage bin, a first piston and a second piston. The contact area between the rear end face of the first piston and high-pressure gas in the high-pressure gas cavity is larger than that between the front end face of the second piston and the high-pressure gas in the high-pressure gas cavity. The trigger shaft is provided with a locking table and a release groove located in the front side and / or the rear side of the locking table, and the groove depth of the release groove is larger than or equal to the height of the locking ball protruding out of the through groove upwards. The device further comprises a fixedly-arranged locking sleeve, the locking sleeve is provided with a limiting table for limiting the locking ball to move forwards, and the limiting table is provided with a guide inclined face matched with the locking ball. The end, acting on the locking ball, of the trigger shaft is arranged in the guide hole of the first piston, the trigger shaft and the sliding face of the trigger shaft are prevented from being exposed outside, the trigger shaft and the sliding face of the trigger shaft are prevented from being rusted or polluted by dust, and moving flexibility of the trigger shaft is guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of coal mine equipment, in particular to the field of safety equipment for underground coal mines, and specifically refers to underground explosion-proof equipment for coal mines. Background Art

[0002] Production safety is a necessary prerequisite for underground coal mine operations, and gas explosion is the main safety hazard in underground coal mines. Since the cross-section of the tunnel space is relatively narrow, once an explosion occurs, the flames generated by the explosion will spread along the tunnel, causing greater casualties and losses.

[0003] At present, in order to block the flames generated by the explosion, a flameproof device is usually installed in the tunnel. When the flameproof device receives the shock wave generated by the explosion, the gas in the high-pressure gas cavity will spray the fire extinguishing powder in the powder storage bin, so that the fire extinguishing powder fills the tunnel cross-section, thereby blocking the explosion flame and preventing the flame from continuing to spread.

[0004] Most of the existing explosion-proof equipment uses a locking ball for locking structure. When no explosion occurs, the outer sleeve is used to limit the locking ball to move radially outward, thereby limiting the axial movement of the internal piston, and separating the high-pressure air chamber from the fire extinguishing powder storage bin. When an explosion occurs, the outer sleeve is forced to move axially, losing the restriction on the locking ball, and the internal piston moves axially, connecting the high-pressure air chamber with the powder storage bin, and using the high-pressure gas to spray the fire extinguishing powder in the powder storage bin.

[0005] Although the existing explosion-proof equipment has achieved explosion-proof to a certain extent, since the outer sleeve that acts on the locking ball is sleeved on the outside of the inner shaft, the inner shaft part that extends out of the outer sleeve is prone to rust and dust, resulting in increased resistance when the outer sleeve moves, thereby reducing the flexibility and timeliness of the movement of the outer sleeve after an explosion, and even the outer sleeve may be unable to move, resulting in explosion-proof failure. Summary of the invention

[0006] The utility model aims at the deficiencies of the prior art and provides an underground explosion-proof device for a coal mine. The trigger shaft is arranged inside, so that the trigger shaft and the sliding surface through which it passes are avoided from being exposed to the outside, thereby greatly improving the reliability of triggering explosion-proof.

[0007] The utility model is realized by the following technical scheme, and provides an underground explosion-proof equipment for a coal mine, comprising a shock wave receiving part, an air storage chamber and a powder storage bin, wherein a high-pressure air cavity is arranged in the air storage chamber, a first piston cylinder is fixedly arranged on the front end plate of the high-pressure air cavity, a second piston cylinder is fixedly arranged on the rear end plate of the high-pressure air cavity, an inner hole of the first piston cylinder and an inner hole of the second piston cylinder are both penetrated in the front-to-back direction, a first piston is slidably connected in the inner hole of the first piston cylinder, a second piston is slidably connected in the inner hole of the second piston cylinder, the first piston is rigidly fixed to the second piston, and a contact area between a rear end face of the first piston and the high-pressure gas in the high-pressure air cavity is greater than a contact area between a front end face of the second piston and the high-pressure gas in the high-pressure air cavity;

[0008] A guide hole extending backward from the front end surface is provided in the first piston, a through groove penetrating in the radial direction is provided on the side wall of the guide hole, a locking ball is placed in the through groove, and the diameter of the locking ball is greater than the height of the through groove;

[0009] A trigger shaft fixedly connected to the shock wave receiving part is slidably arranged in the guide hole, and a locking platform adapted to the inner diameter of the guide hole and a release groove located at the front and / or rear side of the locking platform are arranged on the trigger shaft, and the groove depth of the release groove is greater than or equal to the height of the locking ball protruding upward from the through groove; it also includes a fixed locking sleeve, and a limit platform for limiting the forward movement of the locking ball is arranged on the locking sleeve, and a guide inclined surface adapted to the locking ball is arranged on the limit platform.

[0010] During the use of this solution, when no explosion occurs, the locking platform is opposite to the through groove, forming a block for the locking ball. Since the thrust of the high-pressure gas on the first piston is greater than the thrust of the high-pressure gas on the second piston, the first piston has a tendency to move forward. The locking ball is restricted from moving forward by the limit platform, thereby restricting the first piston from moving forward. At the same time, the guide slope is used to make the limit ball have a tendency to move toward the side where the trigger shaft is located under the thrust of the first piston. As long as the trigger shaft does not move, the first piston and the second piston are both in a stationary state. When the explosion occurs, the explosion produces The shock wave pushes the shock wave receiving part to move, thereby driving the trigger shaft to move forward or backward, so that the release groove moves to a position opposite to the through groove, and the locking platform loses the restriction on the radial movement of the locking ball. Under the action of the guide slope, the locking ball moves into the release groove, and the locking sleeve loses the restriction on the forward movement of the locking ball. The first piston drives the second piston to move forward, so that the second piston moves out of the second piston cylinder, and the high-pressure air chamber and the powder storage bin are connected through the inner hole of the second piston cylinder. The high-pressure gas in the high-pressure air chamber enters the powder storage bin, driving the fire extinguishing powder in the powder storage bin to spray out, thereby realizing explosion isolation.

[0011] As an optimization, the guide hole includes a first light hole adapted to the locking platform, and a second light hole located behind the first light hole, and the inner diameter of the second light hole is larger than the inner diameter of the first light hole. The setting of this optimization scheme reduces the contact area between the trigger shaft and the wall of the guide hole when the trigger shaft moves backward, further reduces the resistance to the movement of the trigger shaft, and improves the trigger flexibility.

[0012] As an optimization, the release groove and the locking platform are both closed along the circumferential direction, and the locking platform is located at the rear end of the trigger shaft, and the release groove is located at the front side of the locking platform. This optimization scheme sets the release groove and the locking platform to be closed along the circumferential direction, which is convenient for simultaneously acting on multiple locking balls arranged along the circumferential direction, and is convenient for processing. The locking platform is set at the rear end of the trigger shaft, and the structure is simpler. When an explosion occurs in front of the equipment, the release groove is used to provide space for the radial movement of the locking ball. When an explosion occurs behind the equipment, the guide hole behind the trigger shaft is used to provide space for the radial movement of the locking ball, thereby realizing two-way triggering.

[0013] As an optimization, the locking sleeve is connected to the first piston cylinder by threads, and the front end of the first piston extends to the inner hole of the locking sleeve. This optimization scheme has a simple structure and is convenient for installing the locking sleeve, better matching with the locking ball, greatly reducing the installation difficulty of the entire equipment, and using the locking sleeve to protect the trigger shaft and the front end of the first piston, further reducing the exposed area of ​​the trigger shaft and the first piston.

[0014] As an optimization, the locking sleeve is fixed with a fixing ring sleeved on the trigger shaft, and the side wall of the fixing ring is provided with a threaded hole penetrating in the radial direction, and a locking bolt connected to the trigger shaft through a thread in the threaded hole. This optimization scheme further improves the protection effect of the rear end of the trigger shaft and the first piston by setting a fixing ring, and at the same time, the locking bolt facilitates the fixing of the trigger shaft during transportation and installation to prevent the trigger shaft from moving due to non-explosive factors.

[0015] As an optimization, a movable cavity is formed between the locking sleeve, the fixing ring, the trigger shaft and the first piston, and a through hole connected to the movable cavity is provided on the side wall of the locking sleeve. This optimization scheme ensures the pressure balance inside and outside the movable cavity by setting the through hole, avoids the formation of resistance to the movement of the first piston, and thus improves the flexibility of triggering the explosion-proof.

[0016] As an optimization, the rear end plate of the high-pressure gas chamber is a tapered cylinder with a small front and a large rear. The front end of the tapered cylinder is sealed and fixedly connected to the outer wall of the second piston cylinder, and the rear end of the tapered cylinder is sealed and fixedly connected to the inner wall of the air storage chamber. The second piston cylinder is located in front of the rear end surface of the air storage chamber. The configuration of this optimization scheme enables the second piston cylinder to be located inside the air storage chamber to avoid interference with the powder storage bin.

[0017] As an optimization, the first piston and the second piston are connected by a rigid rod, the front end of the rigid rod is connected to the first piston by a thread, and the rear end of the rigid rod is connected to the second piston by a thread. The first piston and the second piston of the optimization are connected as a whole by the rigid rod, which ensures the synchronization of the movement of the first piston and the second piston, and has a simple structure, convenient installation and low manufacturing cost.

[0018] The beneficial effects of the utility model are as follows: the end of the trigger shaft that acts on the locking ball is arranged in the guide hole of the first piston, which avoids the trigger shaft and its sliding surface being exposed to the outside, thereby avoiding rust or dust pollution of the trigger shaft and its sliding surface, ensuring the flexibility of the movement of the trigger shaft, and then ensuring the reliability and timeliness of the explosion-proof triggering at both ends; and through the arranged locking sleeve, not only does it play a limiting role on the locking ball, but also further improves the protective effect of the end of the trigger shaft that acts on the locking ball. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 This is a partial enlarged view of the trigger axis;

[0021] Figure 3 A partial enlargement of the removal of the locking ball;

[0022] Figure 4 is a schematic diagram of the connection between the first piston and the second piston;

[0023] As shown in the figure:

[0024] 1. shock wave receiving part, 2. air storage chamber, 3. first piston cylinder, 4. high-pressure air cavity, 5. second piston cylinder, 6. powder storage bin, 7. second piston, 8. rear end plate of high-pressure air cavity, 9. inflation port, 10. rigid rod, 11. first piston, 12. front end plate of high-pressure air cavity, 13. force transmission rod, 14. locking bolt, 15. locking sleeve, 16. movable cavity, 17. through hole, 18. guide hole, 19. locking ball, 20. release groove, 21. trigger shaft, 22. fixing ring, 23. locking platform, 24. limit platform, 25. through groove, 26. first light hole, 27. second light hole. DETAILED DESCRIPTION

[0025] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0026] like Figure 1The coal mine underground explosion-proof equipment shown includes a shock wave receiving part 1, a gas storage chamber 2 and a powder storage bin 6. The shock wave receiving part includes a receiving plate and a force transmission rod 13, which are used to receive the shock wave formed by the explosion and push the trigger shaft to move. A high-pressure gas cavity 4 is provided in the gas storage chamber for storing high-pressure gas, and an air charging port 9 and a pressure gauge are provided on the gas storage chamber shell. The powder storage bin is used to store fire extinguishing powder. The shells of the shock wave receiving part, the powder storage bin and the gas storage chamber can adopt the existing technology, which will not be repeated here. This embodiment improves the explosion-proof trigger device in the prior art.

[0027] Specifically, a first piston cylinder 3 is fixedly provided on the front end plate 12 of the high-pressure air chamber, and a second piston cylinder 5 is fixedly provided on the rear end plate 8 of the high-pressure air chamber. The axis of the first piston cylinder 3 and the axis of the second piston cylinder 5 both extend in the front-to-back direction, and the first piston cylinder 3 and the second piston cylinder 5 are coaxial, thereby improving the reliability of force transmission.

[0028] The rear end plate 8 of the high pressure gas chamber is a tapered cylinder with a small front and a large rear. The front end of the tapered cylinder is sealed and fixedly connected to the outer wall of the second piston cylinder, and the rear end of the tapered cylinder is sealed and fixedly connected to the inner wall of the air storage chamber. The second piston cylinder is located in front of the rear end surface of the air storage chamber. The first piston cylinder is fixed to the front end plate of the high pressure gas chamber, and the outer wall of the first piston cylinder is sealed and fixedly connected to the front end plate of the high pressure gas chamber.

[0029] The inner hole of the first piston cylinder and the inner hole of the second piston cylinder are both connected in the front-to-back direction. The first piston 11 is sealed and slidably connected in the inner hole of the first piston cylinder, and the second piston 7 is sealed and slidably connected in the inner hole of the second piston cylinder. The first piston 11 and the second piston 7 are coaxially arranged, and the outer cylindrical surfaces of the first piston 11 and the second piston 7 are both provided with sealing rings to ensure the sealing effect between the piston cylinders. The contact area between the rear end surface of the first piston and the high-pressure gas in the high-pressure gas cavity is larger than the contact area between the front end surface of the second piston and the high-pressure gas in the high-pressure gas cavity, so that the forward thrust of the high-pressure gas received by the first piston is larger than the backward thrust of the high-pressure gas received by the second piston. The first piston and the second piston are rigidly fixed, that is, the first piston and the second piston are fixed as a whole and can move synchronously in the front-to-back direction. In this embodiment, the first piston and the second piston are connected by a rigid rod 10, the front end of the rigid rod 10 is connected to the first piston 11 by threads, and the rear end of the rigid rod 10 is connected to the second piston 7 by threads. In order to reduce weight and improve the flexibility of piston movement, the rigid rod of this embodiment is a hollow structure and can be made of steel pipe.

[0030] A guide hole 18 extending backward from the front end face is provided in the first piston, and a through groove 25 penetrating in the radial direction is provided on the side wall of the guide hole. A locking ball 19 is placed in the through groove, and the diameter of the locking ball 19 is greater than the height of the through groove 25, so that the locking ball protrudes radially outward from the through groove. The through groove is located at the part where the first piston extends forward from the first piston cylinder, and the through groove is located at the front side of the first piston cylinder. In order to improve stability, the through grooves in this embodiment are two evenly distributed along the circumferential direction, and a locking ball is provided in each of the through grooves. Multiple through grooves can also be provided along the circumferential direction.

[0031] A trigger shaft 21 fixedly connected to the shock wave receiving part is slidably arranged in the guide hole, and the front end of the trigger shaft is fixedly connected to the force transmission rod. The trigger shaft is provided with a locking platform 23 adapted to the inner diameter of the guide hole, and a release groove 20 located on the front and / or rear side of the locking platform. The groove depth of the release groove is greater than or equal to the height of the locking ball protruding upward from the through groove, so that after the locking ball enters the release groove, the part of the locking ball protruding radially outward from the through groove completely enters the through groove, so that the locking sleeve loses the restriction on the locking ball.

[0032] The release groove 20 and the locking platform 23 of this embodiment are both closed along the circumferential direction, and the locking platform is located at the rear end of the trigger shaft, and the release groove is located at the front side of the locking platform. When the locking platform is opposite to the through groove, a cavity is formed behind the locking platform so that the trigger shaft moves backward relative to the first piston. At this time, the locking platform supports the locking ball to prevent the locking ball from moving toward the inner hole of the first piston. Specifically, the guide hole 18 includes a first light hole 26 adapted to the locking platform, and a second light hole 27 located behind the first light hole, and the inner diameter of the second light hole is larger than the inner diameter of the first light hole. When the locking platform is located in the first light hole, the locking platform is opposite to the through groove. When the trigger shaft moves backward under the action of the explosion shock wave, the locking platform moves from the first light hole to the second light hole, which greatly reduces the movement resistance of the trigger shaft.

[0033] The explosion-proof equipment of this embodiment also includes a fixed locking sleeve 15, and the locking sleeve 15 is provided with a limit platform 24 for limiting the forward movement of the locking ball. The limit platform 24 is provided with a guide slope adapted to the locking ball, and the height of the limit platform is adapted to the portion of the locking ball protruding from the through groove.

[0034] For the convenience of installation, the locking sleeve of this embodiment is located in front of the air storage chamber, and the rear end of the locking sleeve 15 is connected to the front end of the first piston cylinder 3 by a thread, and the front end of the first piston extends to the inner hole of the locking sleeve, and the inner hole of the locking sleeve, the first piston, the second piston, and the trigger shaft are coaxially arranged. The limit table limits the forward movement of the locking ball and the first piston, and through the set guide slope, the locking ball has a tendency to move radially inward under the thrust of the first piston, the inner hole wall of the locking sleeve limits the locking ball to move radially outward, and the locking table limits the locking ball to move radially inward.

[0035] A fixing ring 22 is fixedly mounted on the locking sleeve and sleeved on the trigger shaft. The outer surface of the rear end of the fixing ring is fixedly connected to the front end of the inner hole of the locking sleeve. The fixing ring extends forward from the locking sleeve. The inner hole of the fixing ring is adapted to the trigger shaft. A threaded hole that penetrates in the radial direction is provided on the side wall of the fixing ring 22. The threaded hole is located on the front side of the locking sleeve. A locking bolt 14 that is pushed to the trigger shaft is connected to the threaded hole through a thread. A recessed groove that is adapted to the locking bolt is provided on the surface of the trigger shaft. The recessed groove is closed along the circumferential direction. The locking bolt extends into the recessed groove to prevent the trigger shaft from moving during transportation and installation.

[0036] A movable cavity 16 is formed between the locking sleeve 15, the fixing ring 22, the trigger shaft 21 and the first piston 11. A through hole 17 connected to the movable cavity is provided on the side wall of the locking sleeve. The through hole is used to ensure the pressure balance inside and outside the movable cavity, reduce the movement resistance of the first piston, and further improve the timeliness of triggering the explosion-proof. During transportation, the through hole can be blocked with a sealing plug, and the sealing plug can be removed after on-site installation.

[0037] In actual application, after the explosion-proof equipment is installed in the tunnel, the sealing plug at the through hole and the locking bolt on the fixing ring are removed. When no explosion occurs, the locking platform is located at a position opposite to the through groove, forming a block for the locking ball. Since the thrust of the high-pressure gas on the first piston is greater than the thrust of the high-pressure gas on the second piston, the first piston has a tendency to move forward, and the locking ball is restricted from moving forward by the limit platform, thereby restricting the first piston from moving forward. At the same time, the guide bevel is used to make the limit ball have a tendency to move toward the side where the trigger shaft is located under the thrust of the first piston. As long as the trigger shaft does not move, the first piston and the second piston are both in a stationary state. When an explosion occurs in front of the equipment, the shock wave generated by the explosion pushes the shock wave receiving part to move backward, thereby driving the trigger shaft to move backward, so that the release groove moves to a position opposite to the through groove, and the locking platform loses the restriction on the radial movement of the locking ball. Under the action of the guide bevel, the locking ball moves into the release groove, and the locking sleeve loses its locking position. The restriction on the forward movement of the locking ball is removed, the first piston drives the second piston to move forward, so that the second piston is moved out of the second piston cylinder, the high-pressure air chamber and the powder storage bin are connected through the inner hole of the second piston cylinder, and the high-pressure gas in the high-pressure air chamber enters the powder storage bin, driving the fire extinguishing powder in the powder storage bin to spray out, thereby realizing explosion-proof; when an explosion occurs behind the equipment, the shock wave generated by the explosion pushes the shock wave receiving part to move forward, thereby driving the trigger shaft to move forward, so that the locking platform leaves the position relative to the through groove, and the locking platform loses the restriction on the radial movement of the locking ball, the first light hole provides space for the movement of the locking ball, and under the action of the guiding inclined surface, the locking ball moves into the first light hole, and the locking sleeve loses the restriction on the forward movement of the locking ball, the first piston drives the second piston to move forward, so that the second piston is moved out of the second piston cylinder, the high-pressure air chamber and the powder storage bin are connected through the inner hole of the second piston cylinder, and the high-pressure gas in the high-pressure air chamber enters the powder storage bin, driving the fire extinguishing powder in the powder storage bin to spray out, thereby realizing explosion-proof.

[0038] By setting the trigger shaft and the first piston, two-way triggering is achieved, and explosion isolation can be triggered regardless of the explosion in front of or behind the equipment.

[0039] Of course, the above description is not limited to the above examples. The technical features not described in the present invention can be achieved by or by adopting the existing technology, which will not be repeated here. The above embodiments and drawings are only used to illustrate the technical scheme of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that the changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not deviate from the purpose of the present invention and should also fall within the scope of protection of the claims of the present invention.

Claims

1. An underground explosion-proof equipment for a coal mine, comprising a shock wave receiving part (1), a gas storage chamber (2) and a powder storage bin (6), wherein a high-pressure gas cavity (4) is provided in the gas storage chamber, and characterized in that: A first piston cylinder (3) is fixedly arranged on the front end plate (12) of the high-pressure gas chamber, and a second piston cylinder (5) is fixedly arranged on the rear end plate (8) of the high-pressure gas chamber. The inner hole of the first piston cylinder and the inner hole of the second piston cylinder are both connected in the front-to-back direction. A first piston (11) is slidably connected in the inner hole of the first piston cylinder, and a second piston (7) is slidably connected in the inner hole of the second piston cylinder. The first piston and the second piston are rigidly fixedly connected, and a contact area between a rear end surface of the first piston and the high-pressure gas in the high-pressure gas chamber is larger than a contact area between a front end surface of the second piston and the high-pressure gas in the high-pressure gas chamber. A guide hole (18) extending backward from the front end surface is provided in the first piston, a through groove (25) penetrating in the radial direction is provided on the side wall of the guide hole, a locking ball (19) is placed in the through groove, and the diameter of the locking ball (19) is greater than the height of the through groove (25); A trigger shaft (21) fixedly connected to the shock wave receiving portion is slidably disposed in the guide hole, and the trigger shaft is provided with a locking platform (23) adapted to the inner diameter of the guide hole, and a release groove (20) located at the front side and / or the rear side of the locking platform, wherein the groove depth of the release groove is greater than or equal to the height of the locking ball protruding upward from the through groove; It also includes a fixed locking sleeve (15), and the locking sleeve (15) is provided with a limit platform (24) for limiting the forward movement of the locking ball, and the limit platform (24) is provided with a guiding inclined surface adapted to the locking ball.

2. The underground coal mine explosion-proof equipment according to claim 1, characterized in that: The release groove (20) and the locking platform (23) are both closed along the circumferential direction, and the locking platform is located at the rear end of the trigger shaft, and the release groove is located at the front side of the locking platform.

3. The underground coal mine explosion-proof equipment according to claim 2, characterized in that: The guide hole (18) comprises a first light hole adapted to the locking platform, and a second light hole located behind the first light hole, wherein the inner diameter of the second light hole is greater than the inner diameter of the first light hole.

4. The underground coal mine explosion-proof equipment according to claim 1, characterized in that: The locking sleeve (15) is connected to the first piston cylinder (3) via threads, and the front end of the first piston extends to the inner hole of the locking sleeve.

5. The underground coal mine explosion-proof equipment according to claim 4, characterized in that: The locking sleeve is fixedly provided with a fixing ring (22) sleeved on the trigger shaft, and a threaded hole penetrating in the radial direction is provided on the side wall of the fixing ring (22), and a locking bolt (14) is threadedly connected to the trigger shaft in the threaded hole.

6. The underground coal mine explosion-proof equipment according to claim 5, characterized in that: A locating chamber (16) is formed between the locking sleeve (15), the fixing ring (22), the trigger shaft (21) and the first piston (11), and a through hole (17) communicating with the locating chamber is provided on the side wall of the locking sleeve.

7. The underground coal mine explosion-proof equipment according to claim 1, characterized in that: The rear end plate (8) of the high-pressure gas chamber is a tapered cylinder with a smaller front end and a larger rear end. The front end of the tapered cylinder is sealed and fixedly connected to the outer wall of the second piston cylinder, and the rear end of the tapered cylinder is sealed and fixedly connected to the inner wall of the gas storage chamber. The second piston cylinder is located in front of the rear end surface of the gas storage chamber.

8. The underground coal mine explosion-proof equipment according to claim 1, characterized in that: The first piston and the second piston are connected via a rigid rod (10), the front end of the rigid rod (10) is connected to the first piston (11) via a thread, and the rear end of the rigid rod (10) is connected to the second piston (7) via a thread.

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