Bidirectional triggered automatic explosion-proof device in coal mine

Abstract

The present application relates to a kind of two-way triggered automatic explosion-proof equipment in underground coal mine, including first fire extinguishing powder bin, first gas storage, locking sleeve, second gas storage, second fire extinguishing powder bin and push rod, locking sleeve is fixedly connected with push rod, equipment whole symmetry is set in front and back;The front side wall of first gas storage is sealingly fixed with first front piston sleeve, front piston sleeve is slidably arranged in the inner hole of first front piston sleeve, and the inner hole of first front piston sleeve is slidably arranged in the inner hole of first front piston sleeve;The rear side wall of first gas storage is fixed with the first rear piston sleeve extending to the inner hole of locking sleeve, and the rear side wall of first gas storage is fixed with the first rear piston sleeve extending to the inner hole of locking sleeve;The inner hole of first rear piston sleeve is slidably arranged with rear piston I fixedly connected with piston rod I, and the inner hole of first rear piston sleeve is slidably arranged with rear piston I fixedly connected with piston rod I;The front end surface area of rear piston I is greater than the rear end surface area of front piston I, and rear piston I is locked and connected with locking sleeve by limiting ball mechanism I.In the explosion, the present application realizes two-way triggering and fire extinguishing powder respectively spraying in front and back two directions, and improves the explosion-proof effect.

Description

Technical Field

[0001] This invention relates to the field of coal mine equipment technology, and in particular to safety facilities in underground coal mines, specifically a bidirectional triggering automatic explosion-proof device for underground coal mines. Background Technology

[0002] Gas explosions are one of the most serious hazards threatening mine safety and miners' lives during underground coal mining operations. To prevent the spread of flames generated by the explosion and avoid the hazard from expanding, automatic explosion-proof devices are usually installed in coal mine roadways. When an explosion occurs, the shock wave generated by the explosion triggers the explosion-proof device, which sprays extinguishing powder from the extinguishing powder chamber, forming a physical barrier at the roadway cross-section to prevent the spread of flames.

[0003] Currently, most automated explosion-proof devices in use are unidirectionally triggered, meaning they can only receive shock waves from one direction, and extinguishing powder can only be sprayed in one direction. Because the location of an explosion is uncertain, explosion-proof devices need to be installed alternately and symmetrically along the tunnel to meet the requirements of different explosion shock wave propagation directions. While this achieves the blocking of flames from explosions in different directions, it also leads to a low application rate of explosion-proof devices. Explosion-proof devices whose triggering direction is inconsistent with the shock wave propagation direction cannot be used when an explosion occurs, resulting in wasted resources and increased costs.

[0004] Although some patent documents describe explosion-proof devices with bidirectional triggering, the push rod used for receiving and transmitting force needs to be set as a bent structure to avoid the gas storage chamber or fire extinguishing powder chamber, which affects the axial force transmission effect of the push rod and is prone to jamming, thus failing to achieve reliable explosion-proof purpose. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a bidirectional triggering automatic explosion-proof device for underground coal mines. It not only achieves bidirectional triggering but also bidirectional spraying of extinguishing powder, while ensuring the reliability of the push rod force transmission.

[0006] This invention is achieved through the following technical solution: providing a bidirectional triggered automatic explosion-proof device for underground coal mines, comprising a first extinguishing powder chamber, a first gas storage chamber, a locking sleeve, a second gas storage chamber, and a second extinguishing powder chamber arranged sequentially in a front-to-back direction; and a push rod passing through the first extinguishing powder chamber, the first gas storage chamber, the locking sleeve, the second gas storage chamber, and the second extinguishing powder chamber; a connecting frame fixedly connected to the push rod is fixedly provided inside the locking sleeve; a first front piston sleeve is sealed and fixedly connected to the front side wall of the first gas storage chamber, and the inner hole of the first front piston sleeve is respectively connected to the first... A gas storage chamber and a first fire extinguishing powder chamber are connected. A front piston I is slidably installed in the inner hole of the first front piston sleeve. A piston rod I extending rearward is fixedly connected to the front piston I. A through hole for the push rod to pass through is provided in the piston rod I. A first rear piston sleeve extending to the inner hole of the locking sleeve is sealed and fixedly connected to the rear side wall of the first gas storage chamber. A rear piston I fixedly connected to the piston rod I is slidably installed in the first rear piston sleeve. The front end surface area of ​​the rear piston I is larger than the rear end surface area of ​​the front piston I. The rear piston I and the locking sleeve are locked and connected by a limiting ball mechanism I. The rear sidewall of the second gas storage chamber is sealed and fixedly connected to a second rear piston sleeve. The inner hole of the second rear piston sleeve is connected to the second gas storage chamber and the second fire extinguishing powder chamber respectively. A rear piston II is slidably installed in the inner hole of the second rear piston sleeve. A piston rod II extending forward is fixedly connected to the rear piston II. A through hole for the push rod to pass through is provided in the piston rod II. The front sidewall of the second gas storage chamber is sealed and fixedly connected to a second front piston sleeve extending to the inner hole of the locking sleeve. A front piston II fixedly connected to the piston rod II is slidably installed in the second front piston sleeve. The rear end face area of ​​the front piston II is larger than the front end face area of ​​the rear piston II. The front piston II and the locking sleeve are locked and connected by a limiting ball mechanism II.

[0007] This design sets the push rod to pass sequentially through the first extinguishing powder chamber, the first gas storage chamber, the locking sleeve, the second gas storage chamber, and the second extinguishing powder chamber in a front-to-back direction, ensuring the reliability of the push rod's axial force transmission. After an explosion, the push rod moves forward or backward under the action of the shock wave, causing the locking sleeve to move. This releases the limiting ball mechanism I and limiting ball mechanism II from restricting the rear piston I and the front piston II. The rear piston I drives the front piston I to move backward, allowing the gas in the first gas storage chamber to enter the first extinguishing powder chamber through the inner hole of the first front piston sleeve, and spraying the extinguishing powder in the first extinguishing powder chamber forward. The front piston II drives the rear piston II to move forward, allowing the gas in the second gas storage chamber to enter the second extinguishing powder chamber through the inner hole of the second rear piston sleeve, and spraying the extinguishing powder in the second extinguishing powder chamber backward, thus achieving bidirectional triggering and bidirectional spraying.

[0008] As an optimization, a first limiting ring is fixedly connected to the first rear piston sleeve, located behind the rear piston I, and a second limiting ring is fixedly connected to the second front piston sleeve, located in front of the front piston II. The first and second limiting rings each have a through hole for the push rod to pass through. This optimized solution uses the first limiting ring to limit the movement of the rear piston I and the second limiting ring to limit the movement of the front piston II, preventing collisions or ejection between the rear piston I and the front piston II, thus ensuring safe operation.

[0009] As an optimization, an intermediate chamber is formed between the first and second limiting rings within the locking sleeve. Exhaust channels are provided between the push rod and the wall of the through hole in the first limiting ring, and between the push rod and the wall of the through hole in piston rod I. Exhaust channels are also provided between the push rod and the wall of the through hole in the second limiting ring, and between the push rod and the wall of the through hole in piston rod II. The intermediate chamber is connected to the outside through these exhaust channels. This optimized design ensures that the intermediate chamber is connected to the outside, allowing gas in the intermediate chamber to be promptly discharged during the relative movement of the rear piston I and the front piston II after the explosion, thus preventing obstruction of their movement.

[0010] As an optimization, the connecting frame is a circular ring plate, with the push rod passing through the central hole of the ring plate and fixedly connected to it. This optimized connecting component has a simple structure, is easy to manufacture, and helps reduce processing costs.

[0011] As an optimization, the locking sleeve includes a first sleeve and a second sleeve coaxially arranged in the front-rear direction. The ends of the first and second sleeves, close to each other, are engaged with the annular plate, and the first and second sleeves are welded together. The inner walls of the first and second sleeves are provided with positioning platforms that fit the edge of the annular plate. This optimized locking sleeve design, with its first and second sleeves, facilitates the installation of the annular plate. The positioning platforms facilitate the assembly and positioning of the first and second sleeves, followed by welding, significantly reducing the difficulty of installing the annular plate within the locking sleeve.

[0012] As an optimization, a front conical cylinder, wider at the front and narrower at the rear, is fixedly connected to the front end of the first front piston sleeve. The front conical cylinder is fixedly connected to the first extinguishing powder chamber via a flange, and a perforated plate is fixedly sandwiched between the front conical cylinder and the first extinguishing powder chamber. The perforated plate has several vent holes. This optimized design, by setting up the front conical cylinder, facilitates the diffusion and outflow of gas from the gas storage chamber, and by setting up the perforated plate with vent holes, facilitates the dispersion of gas flow, thereby improving the extinguishing powder spraying effect.

[0013] As an optimization, a sleeve is fixedly installed on the tube sheet, with the front end of the sleeve extending forward to form the first extinguishing powder chamber, and the rear end of the sleeve passing through the tube sheet. The push rod passes through the inner hole of the sleeve. This optimized solution, by setting the sleeve, separates the push rod from the extinguishing powder, preventing the push rod from contacting the extinguishing powder and further improving the flexibility of the push rod's movement.

[0014] As an optimization, the sleeve is threadedly connected with a front nut I and a rear nut I, which are located on the front and rear sides of the tube sheet, respectively. This optimized solution uses the front nut I and the rear nut I to fix the sleeve to the tube sheet, resulting in a simple structure and convenient assembly and disassembly.

[0015] As an optimization, the limiting ball mechanism I includes a radial through hole I formed in the side wall of the first rear piston sleeve, a limiting ball I disposed in the radial through hole I, and a limiting protrusion I fixed to the inner wall of the locking sleeve and corresponding to the limiting ball I. The front and rear sides of the limiting protrusion I are respectively provided with receiving grooves I adapted to the limiting ball I, and the rear end of the rear piston I is provided with a step I adapted to the limiting ball I. This optimized solution restricts the radial movement of the limiting ball I by the locking sleeve, thereby using the limiting ball I to block the rear piston I from moving backward, preventing the first gas storage chamber from communicating with the first extinguishing powder chamber. After an explosion, the locking sleeve moves axially, causing the receiving groove I to face the limiting ball I. The limiting ball I enters the receiving groove I under the action of the step I, losing its obstruction of the rear piston I. The rear piston I moves backward under the action of the gas in the first gas storage chamber, and drives the front piston I to move out of the first front piston sleeve, connecting the first gas storage chamber with the first extinguishing powder chamber, thus realizing the spraying of the extinguishing powder.

[0016] As an optimization, the limiting ball mechanism II includes a radial through hole II formed in the side wall of the second front piston sleeve, a limiting ball II disposed in the radial through hole II, and a limiting protrusion II fixed to the inner wall of the locking sleeve and corresponding to the limiting ball II. The front and rear sides of the limiting protrusion II are respectively provided with receiving grooves II adapted to the limiting ball II, and the front end of the front piston II is provided with a step II adapted to the limiting ball II. This optimized solution restricts the radial movement of the limiting ball II by the locking sleeve, thereby using the limiting ball II to block the forward movement of the front piston II and prevent the second gas storage chamber from communicating with the second extinguishing powder chamber. After the explosion, the locking sleeve moves axially, causing the receiving groove II to face the limiting ball II. Under the action of the step II, the limiting ball II enters the receiving groove II, losing its obstruction of the front piston II. The front piston II moves forward under the action of the gas in the second gas storage chamber, and drives the rear piston II to move out of the second rear piston sleeve, thus communicating with the second gas storage chamber and the second extinguishing powder chamber, realizing the spraying of the extinguishing powder.

[0017] The beneficial effects of this invention are as follows: by locking and unlocking the rear piston I and the front piston II simultaneously through the locking sleeve, when an explosion occurs, the extinguishing powder in the first extinguishing powder chamber and the second extinguishing powder chamber is sprayed out in the forward and backward directions respectively through the axial movement of the push rod, which improves the explosion-proof effect. Moreover, it can push the push rod to move axially regardless of whether the explosion occurs in front or behind, thereby realizing bidirectional triggering and bidirectional spraying. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a partial perspective view of the present invention; Figure 3 This is a partial cross-sectional view of the present invention; Figure 4 for Figure 3 Enlarged view of a portion of the image; Figure 5 This is a schematic diagram of the internal structure of the first fire extinguishing powder chamber; As shown in the figure: 1. Push rod, 2. First extinguishing powder chamber, 3. First gas storage chamber, 4. Locking sleeve, 5. Second gas storage chamber, 6. Second extinguishing powder chamber, 7. Front piston I, 8. Rear piston I, 9. Limiting ball I, 10. Front piston II, 11. Rear piston II, 12. Second rear piston sleeve, 13. Piston rod II, 14. Second front piston sleeve, 15. Second limiting ring, 16. Connecting frame, 17. First limiting ring, 18. First rear piston sleeve, 19. Piston rod I, 20. First front piston sleeve, 21. Front cone, 22. Rear cone, 23. Perforated plate, 24. Rear nut I, 25. Front nut I, 26. Sleeve, 27. Crossbeam, 28. Receiving groove I, 29. Limiting ball II. Detailed Implementation

[0019] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0020] like Figure 1 The diagram illustrates a bidirectional triggered automatic explosion-proof device for underground coal mines, comprising a first extinguishing powder chamber 2, a first gas storage chamber 3, a locking sleeve 4, a second gas storage chamber 5, and a second extinguishing powder chamber 6 arranged sequentially along a front-to-back direction, and a push rod 1 that passes sequentially through the first extinguishing powder chamber, the first gas storage chamber, the locking sleeve, the second gas storage chamber, and the second extinguishing powder chamber along a front-to-back direction. The axis of the push rod is consistent with the front-to-back direction, and shock wave receiving plates are respectively installed at the front and rear ends of the push rod. In this embodiment, the structure of the explosion-proof device is symmetrical about the centerline of the locking sleeve along the front-to-back direction. The first extinguishing powder chamber sprays extinguishing powder forward, and the second extinguishing powder chamber sprays extinguishing powder backward.

[0021] The first gas storage chamber 3 and the second gas storage chamber 5 are both cylindrical, and their axes are perpendicular to the axis of the push rod. During installation, the axes of the first gas storage chamber 3 and the second gas storage chamber 5 extend along the width of the roadway, making full use of the space in the width direction of the roadway, reducing the overall length of the equipment, and also facilitating the shortening of the gas discharge distance and improving the spraying effect of the extinguishing powder. To improve structural strength, the first gas storage chamber 3 and the second gas storage chamber 5 are fixedly connected by a crossbeam 27, with both ends of the crossbeam 27 fixed to the first gas storage chamber 3 and the second gas storage chamber 5 respectively by bolts. Lifting lugs are welded to the top of the first gas storage chamber and the second gas storage chamber for easy hanging and installation of the equipment.

[0022] A first front piston sleeve 20 is sealed and fixed to the front side wall of the first gas storage chamber 3. The inner hole of the first front piston sleeve 20 is connected to both the first gas storage chamber 3 and the first fire extinguishing powder chamber 2. A front piston I7 is slidably and sealed within the inner hole of the first front piston sleeve 20. A rearwardly extending piston rod I19 is sealed and fixed to the front piston I7. The piston rod I19 has a through hole through which the push rod 1 passes. When the front piston I7 is inside the first front piston sleeve 20, it blocks the communication between the first gas storage chamber 3 and the first fire extinguishing powder chamber 2. When the front piston I7 moves out of the first front piston sleeve 20, the first gas storage chamber 3 and the first fire extinguishing powder chamber 2 are connected.

[0023] The rear side wall of the first gas storage chamber 3 is sealed and fixedly connected to a first rear piston sleeve 18 extending into the inner hole of the locking sleeve. The first rear piston sleeve 18 is sealed and slidably provided with a rear piston I8 that is sealed and fixedly connected to the piston rod I19. The front end surface area of ​​the rear piston I8 is larger than the rear end surface area of ​​the front piston I7. The area of ​​the gas in the first gas storage chamber acting on the rear piston I8 is larger than the area of ​​the gas acting on the front piston I7, so that the piston assembly I formed by the front piston I, the piston rod I19 and the rear piston I8 has a tendency to move backward. The rear piston I8 is locked and connected to the locking sleeve 4 by a limiting ball mechanism I. In the absence of an explosion, the piston assembly I is restricted from moving backward by the limiting ball mechanism I.

[0024] The limiting ball mechanism I is a mature technology in this field. It blocks the movement of the piston by limiting the ball. Specifically, the limiting ball mechanism I includes a radial through hole I opened in the side wall of the first rear piston sleeve 18, a limiting ball I9 disposed in the radial through hole I, and a limiting protrusion I fixed in the inner wall of the locking sleeve and corresponding to the limiting ball I9. The limiting protrusion I is closed circumferentially. The front and rear sides of the limiting protrusion I are respectively provided with receiving grooves I28 adapted to the limiting ball I. The rear end of the rear piston I8 is provided with a step I adapted to the limiting ball I9. When protrusion I and limiting ball I are radially opposite each other, limiting protrusion I restricts limiting ball I from moving radially outward, limiting ball I blocks step I and restricts rear piston I from moving backward; after the explosion, the shock wave drives the locking sleeve to move through the push rod, limiting protrusion I and limiting ball I are misaligned, receiving groove I 28 moves to be opposite to limiting ball I, and limiting ball I enters receiving groove under the push of rear piston I 8. Rear piston I 8 drives front piston I 7 to move out of the first front piston sleeve 20, realizing the connection between the first gas storage chamber 3 and the first fire extinguishing powder chamber 2.

[0025] A second rear piston sleeve 12 is sealed and fixedly connected to the rear side wall of the second gas storage chamber 5. The inner hole of the second rear piston sleeve 12 communicates with both the second gas storage chamber 5 and the second fire extinguishing powder chamber 6. A rear piston II 11 is slidably and sealed within the inner hole of the second rear piston sleeve 12. A forward-extending piston rod II 13 is sealed and fixedly connected to the rear piston II 11. The piston rod II 13 has a through hole through which the push rod 1 passes. When the rear piston II 11 is located inside the second rear piston sleeve 12, it blocks the communication between the second gas storage chamber 5 and the second fire extinguishing powder chamber 6. When the rear piston II 11 moves out of the second rear piston sleeve 12, the second gas storage chamber 5 communicates with the second fire extinguishing powder chamber 6.

[0026] The front side wall of the second gas storage chamber 5 is sealed and fixedly connected to a second front piston sleeve 14 extending to the inner hole of the locking sleeve. The second front piston sleeve 14 is sealed and slidably provided with a front piston II 10 that is sealed and fixedly connected to the piston rod II 13. The rear end face area of ​​the front piston II 10 is larger than the front end face area of ​​the rear piston II 11. The area of ​​the gas in the second gas storage chamber acting on the front piston II 10 is larger than the area of ​​the gas acting on the rear piston II 11, so that the piston assembly II formed by the front piston II 10, the piston rod II 13 and the rear piston II 11 has a tendency to move forward. The front piston II 10 is locked and connected to the locking sleeve 4 by a limiting ball mechanism II. In the absence of an explosion, the piston assembly II is restricted from moving forward by the limiting ball mechanism II.

[0027] The limiting ball mechanism II is also a mature technology in this field. It operates on the same principle as the limiting ball mechanism I, using a limiting ball to block the movement of the piston. Specifically, the limiting ball mechanism II includes a radial through hole II formed in the side wall of the second front piston sleeve 14, a limiting ball II 29 disposed in the radial through hole II, and a limiting protrusion II fixed to the inner wall of the locking sleeve and corresponding to the limiting ball II 29. The front and rear sides of the limiting protrusion II are respectively provided with receiving grooves II adapted to the limiting ball II 29. The front end of plug II10 is provided with a step II that is adapted to the limiting ball II29. When the limiting protrusion II and the limiting ball II are radially opposite, the limiting ball II blocks the step II, restricting the front piston II from moving forward. When the locking sleeve moves to the receiving groove II and the limiting ball II are radially opposite, the limiting ball II moves radially outward under the action of the front piston II10. The front piston II10 drives the rear piston II11 to move forward out of the second rear piston sleeve 12, realizing the connection between the second gas storage chamber 5 and the second fire extinguishing powder chamber 6.

[0028] To improve safety during use, the movement of the rear piston I8 and the front piston II10 is limited. In this embodiment, a first limiting ring 17 located behind the rear piston I8 is threadedly fixed to the rear end of the first rear piston sleeve 18, and a second limiting ring 15 located in front of the front piston II10 is threadedly fixed to the front end of the second front piston sleeve 14. The first limiting ring 17 and the second limiting ring 15 are respectively provided with through holes for the push rod 1 to pass through.

[0029] An intermediate chamber is formed between the first limiting ring 17 and the second limiting ring 15 within the locking sleeve. Exhaust channels are provided between the push rod 1 and the wall of the through hole of the first limiting ring, and between the push rod and the wall of the through hole of piston rod I. Exhaust channels are also provided between the push rod and the wall of the through hole of the second limiting ring, and between the push rod and the wall of the through hole of piston rod II. The intermediate chamber communicates with the outside through these exhaust channels. When the rear piston I8 and the front piston II10 move relative to each other, the gas in the intermediate chamber can be smoothly discharged, avoiding obstruction to the movement of the rear piston I8 and the front piston II10, thus ensuring the reliability of the equipment triggering.

[0030] The locking sleeve 4 is fixedly equipped with a connecting frame 16 that is fixedly connected to the push rod 1. When the push rod 1 moves axially, it drives the locking sleeve to move, thereby releasing the limiting ball I and the limiting ball II. In this embodiment, the connecting frame 16 is a circular plate, and the push rod 1 passes through the central hole of the circular plate and is fixedly connected to the circular plate.

[0031] To facilitate the installation of the annular plate, the locking sleeve 4 in this embodiment includes a first sleeve and a second sleeve coaxially arranged in the front-to-back direction. The ends of the first and second sleeves that are close together are engaged with the annular plate, and the first and second sleeves are welded together. The inner walls of the first and second sleeves are provided with positioning platforms that fit the edge of the annular plate. The ends of the first and second sleeves that are close together are respectively provided with welding bevels. During manufacturing, the first and second sleeves are first engaged with the positioning platforms of the annular plate, and then welded along the welding bevels, thus realizing the manufacturing of the locking sleeve and the fixation of the annular plate within the locking sleeve.

[0032] A front cone 21, wider at the front and narrower at the rear, is fixedly connected to the front end of the first front piston sleeve 20. The front cone 21 is fixedly connected to the first extinguishing powder chamber 2 via a flange, and a perforated plate 23 is sandwiched and fixed between the front cone 20 and the first extinguishing powder chamber. The perforated plate 23 has several vent holes. Gas in the first gas storage chamber enters the first extinguishing powder chamber through the vent holes on the perforated plate. The gas is diverted by the vent holes on the perforated plate, which improves the spraying effect of the extinguishing powder.

[0033] A sleeve 26 is fixedly installed on the tube sheet. The front end of the sleeve 26 extends forward to form the first extinguishing powder chamber 2, and the rear end of the sleeve 26 passes through the tube sheet 23. The push rod 1 passes through the inner hole of the sleeve 26. The sleeve separates the push rod from the extinguishing powder, reducing the resistance to the push rod's movement and improving the flexibility of the push rod's movement.

[0034] To facilitate the connection between the sleeve and the tube sheet, in this embodiment, a front nut I25 and a rear nut I24 are threaded onto the sleeve. The front nut I25 and the rear nut I24 are located on the front and rear sides of the tube sheet 23, respectively, and the front nut I25 and the rear nut I24 clamp the tube sheet.

[0035] The first and second extinguishing powder chambers have the same structure and are symmetrically arranged, which improves the standardization of the product and reduces the difficulty of installation. A rear cone 22, smaller at the front and larger at the rear, is fixedly connected to the rear end of the second rear piston sleeve 12. The rear cone 22 is fixedly connected to the second extinguishing powder chamber via a flange, and a perforated plate is also clamped and fixed between the rear cone and the second extinguishing powder chamber. A sleeve is also fixedly installed inside the second extinguishing powder chamber to separate the push rod from the extinguishing powder; the push rod passes through the inner hole of the sleeve.

[0036] The automatic explosion-proof device in this embodiment uses a single locking sleeve to lock and release both pistons. Regardless of whether the explosion occurs from the front or rear of the device, when the explosion shock wave pushes the push rod, the locking sleeve moves axially, simultaneously triggering the pistons on both sides, achieving bidirectional triggering and bidirectional ejection of the extinguishing powder. The two extinguishing powder chambers are supplied with gas from their respective corresponding gas storage chambers, improving the ejection effect of the extinguishing powder. The push rod's axial positioning and movement achieve better force transmission and improve triggering reliability.

[0037] Of course, the above description is not limited to the examples above. Technical features not described in this invention can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solutions of this invention and are not intended to limit this invention. This invention has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this invention do not depart from the spirit of this invention and should also fall within the scope of protection of the claims of this invention.

Claims

1. A bidirectional triggered automatic explosion-proof device for underground coal mines, characterized in that: It includes a first fire extinguishing powder chamber (2), a first gas storage chamber (3), a locking sleeve (4), a second gas storage chamber (5), and a second fire extinguishing powder chamber (6) arranged sequentially in the front-back direction, and a push rod (1) passing through the first fire extinguishing powder chamber, the first gas storage chamber, the locking sleeve, the second gas storage chamber, and the second fire extinguishing powder chamber. The locking sleeve (4) is fixedly provided with a connecting bracket (16) that is fixedly connected to the push rod (1); The front side wall of the first gas storage chamber (3) is sealed and fixedly connected to the first front piston sleeve (20). The inner hole of the first front piston sleeve (20) is connected to the first gas storage chamber (3) and the first fire extinguishing powder chamber (2) respectively. A front piston I (7) is slidably provided in the inner hole of the first front piston sleeve (20). A piston rod I (19) extending backward is fixedly connected to the front piston I (7). A through hole is provided in the piston rod I (19) for the push rod (1) to pass through. The rear side wall of the first gas storage chamber (3) is sealed and fixedly connected to a first rear piston sleeve (18) extending to the inner hole of the locking sleeve. The first rear piston sleeve (18) is slidably provided with a rear piston I (8) fixedly connected to the piston rod I (19). The front end surface area of ​​the rear piston I (8) is larger than the rear end surface area of ​​the front piston I (7). The rear piston I (8) and the locking sleeve (4) are locked and connected by a limiting ball mechanism I. The rear side wall of the second gas storage chamber (5) is sealed and fixedly connected to the second rear piston sleeve (12). The inner hole of the second rear piston sleeve (12) is connected to the second gas storage chamber (5) and the second fire extinguishing powder chamber (6) respectively. The rear piston II (11) is slidably provided in the inner hole of the second rear piston sleeve (12). The rear piston II (11) is fixedly connected to the forward-extending piston rod II (13). The piston rod II (13) is provided with a through hole for the push rod (1) to pass through. The front side wall of the second gas storage chamber (5) is sealed and fixedly connected to a second front piston sleeve (14) extending to the inner hole of the locking sleeve. The second front piston sleeve (14) is slidably provided with a front piston II (10) fixedly connected to the piston rod II (13). The rear end surface area of ​​the front piston II (10) is larger than the front end surface area of ​​the rear piston II (11). The front piston II (10) and the locking sleeve (4) are locked and connected by a limiting ball mechanism II.

2. The bidirectional triggered automatic explosion-proof device for underground coal mines according to claim 1, characterized in that: A first limiting ring (17) located behind the rear piston I (8) is fixedly connected to the first rear piston sleeve (18), and a second limiting ring (15) located in front of the front piston II (10) is fixedly connected to the second front piston sleeve (14). The first limiting ring (17) and the second limiting ring (15) are respectively provided with through holes for the push rod (1) to pass through.

3. The bidirectional triggered automatic explosion-proof device for underground coal mines according to claim 2, characterized in that: An intermediate chamber is formed between the first limiting ring (17) and the second limiting ring (15) within the locking sleeve. Exhaust channels are provided between the push rod (1) and the through hole wall of the first limiting ring, and between the push rod and the through hole wall of piston rod I. Exhaust channels are also provided between the push rod and the through hole wall of the second limiting ring, and between the push rod and the through hole wall of piston rod II. The intermediate chamber is connected to the outside through the exhaust channels.

4. The bidirectional triggered automatic explosion-proof device for underground coal mines according to claim 1, characterized in that: The connecting frame (16) is a circular ring plate, and the push rod (1) passes through the central hole of the circular ring plate and is fixedly connected to the circular ring plate.

5. The bidirectional triggered automatic explosion-proof device for underground coal mines according to claim 4, characterized in that: The locking sleeve (4) includes a first sleeve and a second sleeve arranged coaxially in the front-back direction. The ends of the first sleeve and the second sleeve that are close to each other are locked onto the annular plate, and the first sleeve and the second sleeve are welded together. The inner walls of the first sleeve and the second sleeve are provided with positioning platforms that are adapted to the edge of the annular plate.

6. The bidirectional triggered automatic explosion-proof device for underground coal mines according to claim 1, characterized in that: The front end of the first front piston sleeve (20) is fixedly connected to a front cone (21) that is larger in the front and smaller in the rear. The front cone (21) is fixedly connected to the first fire extinguishing powder chamber (2) through a flange. A perforated plate (23) is sandwiched and fixed between the front cone and the first fire extinguishing powder chamber. Several ventilation holes are provided on the perforated plate (23).

7. The bidirectional triggered automatic explosion-proof device for underground coal mines according to claim 6, characterized in that: A sleeve (26) is fixedly installed on the tube sheet. The front end of the sleeve (26) extends forward to form the first fire extinguishing powder chamber (2). The rear end of the sleeve (26) passes through the tube sheet (23) and the push rod (1) passes through the inner hole of the sleeve (26).

8. The bidirectional triggered automatic explosion-proof device for underground coal mines according to claim 7, characterized in that: The sleeve is connected by a front nut I (25) and a rear nut I (24) by threads. The front nut I (25) and the rear nut I (24) are located on the front and rear sides of the tube sheet (23), respectively.

9. The bidirectional triggered automatic explosion-proof device for underground coal mines according to claim 1, characterized in that: The limiting ball mechanism I includes a radial through hole I opened on the side wall of the first rear piston sleeve, a limiting ball I (9) disposed in the radial through hole I, and a limiting protrusion I fixed on the inner wall of the locking sleeve and corresponding to the limiting ball I (9). The front and rear sides of the limiting protrusion I are respectively provided with receiving grooves I (28) adapted to the limiting ball I, and the rear end of the rear piston I (8) is provided with a step I adapted to the limiting ball I (9).

10. A bidirectional triggered automatic explosion-proof device for underground coal mines according to claim 9, characterized in that: The limiting ball mechanism II includes a radial through hole II opened on the side wall of the second front piston sleeve, a limiting ball II (29) disposed in the radial through hole II, and a limiting protrusion II fixed on the inner wall of the locking sleeve and corresponding to the limiting ball II (29). The front and rear sides of the limiting protrusion II are respectively provided with receiving grooves II adapted to the limiting ball II (29), and the front end of the front piston II (10) is provided with a step II adapted to the limiting ball II (29).

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