Bidirectional explosion-proof equipment

Abstract

The utility model relates to bidirectional explosion-proof equipment which comprises a first receiving part, a first powder storage bin, a first gas storage bin, a second gas storage bin, a second powder storage bin and a second receiving part, a first locking hole is formed in the side wall of a first sliding cavity, and a first locking ball is placed in the first locking hole; a trigger shaft extending backwards to the second sliding cavity is arranged in the first sliding cavity in a sliding mode, a first boss opposite to the first locking hole and a second boss opposite to the second locking hole are arranged on the trigger shaft, the trigger shaft is fixedly connected with the first receiving part through a first dowel bar, and the trigger shaft is fixedly connected with the second receiving part through a second dowel bar. According to the utility model, the trigger shaft and the sliding surface of the trigger shaft are prevented from being exposed outside, so that the trigger shaft and the sliding surface of the trigger shaft are prevented from being rusted or polluted by dust, the movement flexibility of the trigger shaft is ensured, and the reliability and timeliness of bidirectional trigger explosion suppression are further ensured; bidirectional receiving of explosive shock waves and bidirectional eruption explosion suppression are achieved, and the explosion suppression effect is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of coal mine equipment, in particular to the field of safety equipment for underground coal mines, and specifically refers to a bidirectional explosion-proof equipment. 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 a bidirectional explosion-proof device, which not only avoids the exposure of the trigger shaft and the sliding surface thereof, but also realizes bidirectional reception of explosion shock waves and bidirectional eruption explosion-proof.

[0007] The utility model is realized through the following technical scheme, and provides a bidirectional explosion-proof equipment, including a first receiving part, a first powder storage bin, a first gas storage bin, a second gas storage bin, a second powder storage bin and a second receiving part, which are arranged in sequence along the front-to-back direction, a first fixing sleeve is fixedly provided at the rear end of the first gas storage bin, a first trigger piston with a tendency to move backward is slidably provided in the inner hole of the first fixing sleeve along the front-to-back direction, a second fixing sleeve is fixedly provided at the front end of the second gas storage bin, a second trigger piston with a tendency to move forward is slidably provided in the inner hole of the second fixing sleeve along the front-to-back direction, a first sliding cavity extending forward from the rear end surface thereof is provided in the first trigger piston, a first locking hole located behind the first fixing sleeve and penetrating in the radial direction is provided on the side wall of the first sliding cavity, a first locking ball is placed in the first locking hole; a second sliding cavity extending backward from the front end surface thereof is provided in the second trigger piston, a second locking hole located in front of the second fixing sleeve and penetrating in the radial direction is provided on the side wall of the second sliding cavity, a second locking ball is placed in the second locking hole;

[0008] A trigger shaft is slidably disposed in the first sliding cavity and extends backward to the second sliding cavity. The trigger shaft is provided with a first boss opposite to the first locking hole and a second boss opposite to the second locking hole. The trigger shaft is fixedly connected to the first receiving portion via a first force transmission rod, and the trigger shaft is fixedly connected to the second receiving portion via a second force transmission rod.

[0009] The front and rear sides of the first boss are respectively provided with accommodating spaces for the first locking ball to enter, and the front and rear sides of the second boss are respectively provided with accommodating spaces for the second locking ball to enter, and the depth of the accommodating spaces in the radial direction is greater than the height of the first locking ball extending radially outward from the first locking hole, and the height of the second locking ball extending radially outward from the second locking hole;

[0010] It also includes a first limit device fixedly arranged relative to the first air storage bin, and a second limit device fixedly arranged relative to the second air storage bin, the first limit device is provided with a first limit platform for limiting the radial outward movement of the first locking ball, and the first limit platform is provided with a guide inclined surface for allowing the first locking ball to move radially inward; the second limit device is provided with a second limit platform for limiting the radial outward movement of the second locking ball, and the second limit platform is provided with a guide inclined surface for allowing the second locking ball to move radially inward.

[0011] During the use of this scheme, when no explosion occurs, the radial movement of the locking ball is limited by the limit platform and the boss respectively, thereby limiting the forward and backward movement of the trigger piston. At the same time, the locking ball has a tendency to move radially inward. When an explosion occurs in front of or behind the explosion-proof equipment of this scheme, the shock wave generated by the explosion pushes the first receiving part or the second receiving part to move, and the trigger shaft moves in the forward and backward direction by utilizing the force transmitted by the force transmitting rod. The boss leaves the locking ball, and the locking ball enters the accommodating space, losing the restriction on the trigger piston. The first trigger piston and the second trigger piston move relative to each other, causing the high-pressure gas in the first gas storage bin to enter the first powder storage bin and spray the fire extinguishing powder in the first powder storage bin forward. At the same time, the high-pressure gas in the second gas storage bin enters the second powder storage bin and sprays the fire extinguishing powder in the second powder storage bin backward, thereby realizing two-way explosion isolation.

[0012] As an optimization, the first limiting device includes a first sleeve sleeved on the rear end of the first trigger piston, the front end of the first sleeve is fixedly connected to the first fixed sleeve, and the first limiting platform is arranged in the inner hole of the first sleeve; the second limiting device includes a second sleeve sleeved on the front end of the second trigger piston, the rear end of the second sleeve is fixedly connected to the second fixed sleeve, and the second limiting platform is arranged in the inner hole of the second sleeve. The first limiting device and the second limiting device of this optimization scheme both adopt a sleeve structure, which is convenient for connection with the first fixed sleeve and the second fixed sleeve, and is convenient for assembly. After the locking ball is placed in the locking hole, the sleeve can be tightened.

[0013] As an optimization, the first sleeve is fixed with a first positioning ring located behind the first trigger piston, the second sleeve is fixed with a second positioning ring located in front of the second trigger piston, the first positioning ring and the second positioning ring are both sleeved on the trigger shaft, and the first positioning ring and the second positioning ring are both threadedly connected with a fixing bolt that is radially pushed to the trigger shaft. The setting of this optimization solution makes it convenient to fix the trigger shaft by the fixing bolt to prevent the trigger shaft from moving by itself during transportation or installation.

[0014] As an optimization, the trigger shaft is provided with recessed grooves respectively adapted to the fixing bolts. By providing the recessed grooves, this optimization scheme further avoids the displacement of the trigger shaft relative to the fixing bolts in the front-rear direction, ensures the reliability of the fixing of the trigger shaft, and after the installation is completed, the fixing bolts are removed.

[0015] As an optimization, a first cavity is formed between the first sleeve, the first trigger piston, the trigger shaft and the first positioning ring, and a vent hole connected to the first cavity is provided on the side wall of the first sleeve. A second cavity is formed between the second sleeve, the second trigger piston, the trigger shaft and the second positioning ring, and a vent hole connected to the second cavity is provided on the side wall of the second sleeve. This optimization scheme improves the flexibility of the first trigger piston and the second trigger piston when they move by providing the vent hole, and avoids the movement of the first trigger piston and the second trigger piston being hindered by the pressure difference.

[0016] As an optimization, a protective sleeve is further included, one end of which is sleeved and fixed to the first sleeve and the other end of which is sleeved and fixed to the second sleeve. This optimization solution further avoids the trigger shaft from being exposed by providing the protective sleeve, thereby ensuring the flexibility of the trigger shaft in movement.

[0017] As an optimization, a first guide sleeve is sealed and fixed on the front end plate of the high-pressure gas cavity of the first gas storage bin, and a first auxiliary piston is slidably provided in the inner hole of the first guide sleeve along the front-to-back direction. The contact area between the first auxiliary piston and the high-pressure gas in the high-pressure gas cavity is smaller than the contact area between the first trigger piston and the high-pressure gas in the high-pressure gas cavity. The first trigger piston and the first auxiliary piston are fixedly connected through a first sleeve, and the first force transmission rod passes through the inner hole of the first sleeve. This optimization scheme makes use of the high-pressure gas in the high-pressure gas cavity, and the area difference between the first auxiliary piston and the first trigger piston makes the first trigger piston have a tendency to move backward. The structure is simple, and no other structures need to be set up additionally. The reliable movement of the first force transmission rod is guaranteed by setting the first sleeve.

[0018] As an optimization, a third sleeve extending in the front-to-back direction is fixed in the first powder storage bin, and the third sleeve is sealed and fixed to the front end plate and the rear end plate of the fire extinguishing powder storage chamber of the first powder storage bin, respectively, and the first force transmission rod passes through the inner hole of the third sleeve. This optimization scheme allows the first force transmission rod to pass through the first powder storage bin by setting the third sleeve, while preventing the leakage of fire extinguishing powder.

[0019] The beneficial effects of the utility model are as follows: the trigger shaft and the locking ball are arranged inside the limit device, and by arranging the positioning ring and the protective sleeve, the trigger shaft and its sliding surface are prevented from being exposed to the outside, thereby preventing the trigger shaft and its sliding surface from being rusted or contaminated by dust, ensuring the flexibility of the movement of the trigger shaft, and then ensuring the reliability and timeliness of the two-way trigger explosion isolation; realizing two-way reception of explosion shock waves and two-way eruption explosion isolation, greatly improving the explosion isolation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 This is a schematic diagram of the internal structure of the first gas storage bin;

[0022] Figure 3 for Figure 1 Middle partial enlarged picture;

[0023] Figure 4 is a schematic diagram of the structure of the first sleeve;

[0024] Figure 5 This is a schematic diagram of the trigger axis structure;

[0025] Figure 6 is a schematic diagram of the structure of the first trigger piston;

[0026] Figure 7 This is a schematic diagram of the structure of the first powder storage bin;

[0027] As shown in the figure:

[0028] 1. first receiving part, 2. first force transmission rod, 3. first powder storage bin, 4. first air storage bin, 5. front end plate of high-pressure air chamber, 6. first guide sleeve, 7. first auxiliary piston, 8. first sleeve, 9. first trigger piston, 10. first fixing sleeve, 11. vent hole, 12. first sleeve, 13. protective sleeve, 14. trigger shaft, 15. first positioning ring, 16. first cavity, 17. first locking ball, 18. first boss, 19. first accommodating groove, 20. sink groove, 21. threaded hole, 22. guide slope, 23. first sliding cavity, 24. first locking hole, 25. third sleeve. DETAILED DESCRIPTION

[0029] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0030] like Figure 1 A bidirectional explosion-proof equipment of the present embodiment is shown, which is a symmetrical structure as a whole, including a first receiving part 1, a first powder storage bin 3, a first gas storage bin 4, a second gas storage bin, a second powder storage bin and a second receiving part arranged in sequence along the front-to-back direction, the first powder storage bin 3 and the second powder storage bin are symmetrically arranged, the first gas storage bin 4 and the second gas storage bin are symmetrically arranged, fire extinguishing powder is placed in the fire extinguishing powder storage chambers of the first powder storage bin and the second powder storage bin, and high-pressure gas is re-set in the high-pressure gas cavities of the first gas storage bin and the second gas storage bin.

[0031] A first fixed sleeve 10 is fixedly provided at the rear end of the first gas storage bin, and a first trigger piston 9 with a tendency to move backward is slidably provided in the inner hole of the first fixed sleeve along the front-to-back direction. A second fixed sleeve is fixedly provided at the front end of the second gas storage bin, and a second trigger piston with a tendency to move forward is slidably provided in the inner hole of the second fixed sleeve along the front-to-back direction. Specifically, the first fixed sleeve and the rear end plate of the first gas storage bin, as well as the second fixed sleeve and the rear end plate of the second gas storage bin are all sealed and fixed. A first guide sleeve 6 is sealed and fixedly provided on the front end plate 5 of the high-pressure gas chamber of the first gas storage bin, and a first auxiliary piston 7 is slidably provided in the inner hole of the first guide sleeve 6 along the front-to-back direction. The contact area between the first auxiliary piston 7 and the high-pressure gas in the high-pressure gas chamber is smaller than the contact area between the first trigger piston 9 and the high-pressure gas in the high-pressure gas chamber. The first trigger piston and the first auxiliary piston are fixedly provided through a first sleeve 8, and the two ends of the first sleeve are respectively connected to the first trigger piston and the first auxiliary piston through threads. A second guide sleeve is sealed and fixed on the rear end plate of the high-pressure air chamber of the second air storage tank, and a second auxiliary piston is slidably provided on the inner hole of the second guide sleeve along the front-to-back direction. The contact area between the second auxiliary piston and the high-pressure gas in the high-pressure air chamber is smaller than the contact area between the second trigger piston and the high-pressure gas in the high-pressure air chamber. The second trigger piston and the second auxiliary piston are fixedly connected by a second sleeve, and the second force transmission rod passes through the inner hole of the second sleeve.

[0032] A first sliding cavity 23 extending forward from the rear end surface thereof is defined in the first trigger piston 9, and a first locking hole 24 located behind the first fixing sleeve 10 and radially penetrating therethrough is defined on the side wall of the first sliding cavity. A first locking ball 17 is placed in the first locking hole 24, and the first locking ball protrudes radially outward from the first locking hole.

[0033] A second sliding cavity extending backward from the front end surface of the second trigger piston is formed in the second sliding cavity, and a second locking hole located in front of the second fixing sleeve and passing radially is formed on the side wall of the second sliding cavity, and a second locking ball is placed in the second locking hole, and the second locking ball protrudes radially outward from the second locking hole. In this embodiment, the first locking ball and the second locking ball are both evenly distributed along the circumferential direction to ensure force balance.

[0034] A trigger shaft 14 is slidably disposed in the first sliding cavity and extends backward to the second sliding cavity. The trigger shaft is provided with a first boss 18 opposite to the first locking hole 24, and a second boss opposite to the second locking hole. The outer diameter of the first boss is adapted to the inner diameter of the first sliding cavity, and the outer diameter of the second boss is adapted to the inner diameter of the second sliding cavity. The trigger shaft 14 is fixedly connected to the first receiving part 1 through the first force transmission rod 2, and the trigger shaft is fixedly connected to the second receiving part through the second force transmission rod. The first force transmission rod passes forward through the first gas storage bin and the first powder storage bin, and the first force transmission rod is sealed with the high-pressure gas cavity in the first gas storage bin, and the first force transmission rod is sealed with the fire extinguishing powder storage chamber in the first powder storage bin. Specifically, the rear end of the first force transmission rod is connected to the front end of the trigger shaft by threads, the first force transmission rod passes forward through the inner hole of the first sleeve, and the front end of the first force transmission rod is connected to the first receiving part by threads. The front end of the second force transmission rod is connected to the rear end of the trigger shaft by threads, the second force transmission rod passes backward through the inner hole of the second sleeve, the rear end of the second force transmission rod is connected to the second receiving part by threads, and the first receiving part and the second receiving part both adopt the existing disc structure.

[0035] The front and rear sides of the first boss are respectively provided with a receiving space for the first locking ball to enter, and the front and rear sides of the second boss are respectively provided with a receiving space for the second locking ball to enter, and the depth of the receiving space in the radial direction is greater than the height of the first locking ball extending radially outward from the first locking hole, and the height of the second locking ball extending radially outward from the second locking hole. In this embodiment, the receiving space on the front side of the first boss is a first sliding cavity, and the receiving space on the rear side of the first boss is a first receiving groove 19 provided on the surface of the trigger shaft, and the first receiving groove is circumferentially continuous. The receiving space on the rear side of the second boss is a second sliding cavity, and the receiving space on the front side of the second boss is a second receiving groove provided on the surface of the trigger shaft, and the second receiving groove is circumferentially continuous.

[0036] The bidirectional explosion-proof equipment of this embodiment also includes a first limit device fixedly arranged relative to the first gas storage bin, and a second limit device fixedly arranged relative to the second gas storage bin, the first limit device is provided with a first limit platform for limiting the first locking ball to move radially outward, and the first limit platform is provided with a guide inclined surface 22 for allowing the first locking ball to move radially inward. The second limit device is provided with a second limit platform for limiting the second locking ball to move radially outward, and the second limit platform is provided with a guide inclined surface for allowing the second locking ball to move radially inward.

[0037] Specifically, the first limiting device includes a first sleeve 12 sleeved on the rear end of the first trigger piston, the front end of the first sleeve is fixedly connected to the first fixing sleeve 10 by threads, and the first limiting platform is arranged in the inner hole of the first sleeve. The second limiting device includes a second sleeve sleeved on the front end of the second trigger piston, the rear end of the second sleeve is fixedly connected to the second fixing sleeve by threads, and the second limiting platform is arranged in the inner hole of the second sleeve.

[0038] The first sleeve is fixed with a first positioning ring 15 located behind the first trigger piston 9, and the second sleeve is fixed with a second positioning ring located in front of the second trigger piston. The first positioning ring and the second positioning ring are both sleeved on the trigger shaft, and the first positioning ring and the second positioning ring are both threadedly connected with a fixing bolt that pushes radially to the trigger shaft. The first positioning ring and the second positioning ring are provided with threaded holes 21 that match the fixing bolts, and the trigger shaft is provided with a sink groove 20 that matches each fixing bolt. The fixing bolt pushes into the sink groove to limit the trigger shaft from moving forward and backward during transportation or installation.

[0039] A first cavity 16 is formed between the first sleeve, the first trigger piston, the trigger shaft and the first positioning ring, and a vent hole 11 connected to the first cavity is provided on the side wall of the first sleeve. A second cavity is formed between the second sleeve, the second trigger piston, the trigger shaft and the second positioning ring, and a vent hole connected to the second cavity is provided on the side wall of the second sleeve. The vent holes are provided to prevent the movement of the first trigger piston and the second trigger piston from being hindered due to the inability to discharge the gas in the first cavity and the second cavity. During transportation, the vent holes can be blocked with sealing plugs, and the sealing plugs can be removed after on-site installation.

[0040] In order to further prevent the trigger shaft from being exposed, the present embodiment further includes a protective sleeve 13 having one end sleeved and fixed to the first sleeve and the other end sleeved and fixed to the second sleeve. The protective sleeve can be made of metal and connected to the first sleeve and the second sleeve by threads, or it can be made of flexible material and its two ends are respectively bonded and fixed to the outer cylindrical surfaces of the first sleeve and the second sleeve.

[0041] A third sleeve 25 extending in the front-to-back direction is fixedly provided in the first powder storage bin, and the third sleeve 25 is respectively sealed and fixedly connected to the front end plate and the rear end plate of the fire extinguishing powder storage chamber of the first powder storage bin, and the first force transmission rod passes through the inner hole of the third sleeve. A fourth sleeve extending in the front-to-back direction is fixedly provided in the second powder storage bin, and the fourth sleeve is respectively sealed and fixedly connected to the front end plate and the rear end plate of the fire extinguishing powder storage chamber of the second powder storage bin, and the second force transmission rod passes through the inner hole of the fourth sleeve.

[0042] In actual applications, after the explosion-proof equipment is installed on the top of the tunnel through a hanging bracket, the sealing plugs at each vent and the fastening bolts on each positioning ring are removed. When no explosion occurs, under the action of the guide ramp, the locking ball tends to move radially inward, and the first boss and the second boss respectively form obstacles to the radial inward movement of each locking ball. Under the action of the pressure difference, the first trigger piston and the second trigger piston tend to move relative to each other. At the same time, the axial restriction on the part of the locking ball protruding from the locking hole is utilized to prevent the first trigger piston and the second trigger piston from moving. As long as the trigger shaft does not move, the first trigger piston and the second trigger piston are both in a stationary state. When an explosion occurs in front of or behind the explosion-proof equipment, the shock wave generated by the explosion pushes the first receiving part or the second receiving part to move in the front-to-back direction, thereby driving the trigger shaft to move in the front-to-back direction, and the boss leaves the locking hole, and loses the restriction on the radial movement of the locking ball. Under the action of the guide inclined surface, the locking ball moves to the accommodating space, and the first sleeve and the second sleeve lose the restriction on the front-to-back movement of the locking ball. The first trigger piston and the second trigger piston move relative to each other, driving the first auxiliary piston and the second auxiliary piston to move out of the first guide sleeve and the second guide sleeve respectively, and the first gas storage bin and the first powder storage bin are connected through the inner hole of the first guide sleeve, and the second gas storage bin and the second powder storage bin are connected through the inner hole of the second guide sleeve, so that the high-pressure gas in the first gas storage bin enters the first powder storage bin and sprays the fire extinguishing powder in the first powder storage bin, and the high-pressure gas in the second gas storage bin enters the second powder storage bin and sprays the fire extinguishing powder in the second powder storage bin, thereby realizing two-way eruption explosion-proof.

[0043] 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. A bidirectional explosion-proof device, comprising a first receiving portion (1), a first powder storage bin (3), a first gas storage bin (4), a second gas storage bin, a second powder storage bin and a second receiving portion, which are arranged in sequence along the front-to-back direction, a first fixing sleeve (10) is fixedly arranged at the rear end of the first gas storage bin, a first trigger piston (9) having a tendency to move backward is slidably arranged in the inner hole of the first fixing sleeve along the front-to-back direction, a second fixing sleeve is fixedly arranged at the front end of the second gas storage bin, a second trigger piston having a tendency to move forward is slidably arranged in the inner hole of the second fixing sleeve along the front-to-back direction, and the characteristics are: The first trigger piston (9) has a first sliding cavity (23) extending forward from its rear end surface, and a first locking hole (24) located behind the first fixing sleeve (10) and passing through in the radial direction is formed on the side wall of the first sliding cavity, wherein a first locking ball (17) is placed in the first locking hole (24); The second trigger piston is provided with a second sliding cavity extending backward from its front end surface, and a second locking hole located in front of the second fixing sleeve and passing through in the radial direction is provided on the side wall of the second sliding cavity, and a second locking ball is placed in the second locking hole; A trigger shaft (14) is slidably disposed in the first sliding cavity and extends backward to the second sliding cavity. The trigger shaft is provided with a first boss (18) opposite to the first locking hole (24), and a second boss opposite to the second locking hole. The trigger shaft (14) is fixedly connected to the first receiving portion (1) via a first force transmission rod (2), and the trigger shaft is fixedly connected to the second receiving portion via a second force transmission rod. The front and rear sides of the first boss are respectively provided with accommodating spaces for the first locking ball to enter, and the front and rear sides of the second boss are respectively provided with accommodating spaces for the second locking ball to enter, and the depth of the accommodating spaces in the radial direction is greater than the height of the first locking ball extending radially outward from the first locking hole, and the height of the second locking ball extending radially outward from the second locking hole; The invention also comprises a first limit device fixedly arranged relative to the first air storage bin, and a second limit device fixedly arranged relative to the second air storage bin, wherein the first limit device is provided with a first limit platform for limiting the first locking ball from moving radially outward, and the first limit platform is provided with a guide inclined surface (22) for enabling the first locking ball to move radially inward; the second limit device is provided with a second limit platform for limiting the second locking ball from moving radially outward, and the second limit platform is provided with a guide inclined surface for enabling the second locking ball to move radially inward.

2. A two-way explosion-proof equipment according to claim 1, characterized in that: The first limiting device comprises a first sleeve (12) sleeved on the rear end of the first trigger piston, the front end of the first sleeve is fixedly connected to the first fixed sleeve (10), and the first limiting platform is arranged in the inner hole of the first sleeve; The second limiting device includes a second sleeve sleeved on the front end of the second trigger piston, the rear end of the second sleeve is fixedly connected to the second fixed sleeve, and the second limiting platform is arranged in the inner hole of the second sleeve.

3. A bidirectional explosion-proof equipment according to claim 2, characterized in that: The first sleeve is fixedly provided with a first positioning ring (15) located behind the first trigger piston (9), and the second sleeve is fixedly provided with a second positioning ring located in front of the second trigger piston. The first positioning ring and the second positioning ring are both sleeved on the trigger shaft, and the first positioning ring and the second positioning ring are both threadedly connected with fixing bolts that are radially pressed against the trigger shaft.

4. A bidirectional explosion-proof equipment according to claim 3, characterized in that: The trigger shaft is provided with recessed grooves (20) respectively adapted to the fixing bolts.

5. The bidirectional explosion-proof equipment according to claim 3, characterized in that: A first cavity (16) is formed between the first sleeve, the first trigger piston, the trigger shaft and the first positioning ring, and a vent hole (11) communicating with the first cavity is provided on the side wall of the first sleeve. A second cavity is formed between the second sleeve, the second trigger piston, the trigger shaft and the second positioning ring, and a vent hole communicating with the second cavity is provided on the side wall of the second sleeve.

6. A bidirectional explosion-proof equipment according to claim 2, characterized in that: It also includes a protective sleeve (13) having one end sleeved and fixed on the first sleeve and the other end sleeved and fixed on the second sleeve.

7. The bidirectional explosion-proof equipment according to claim 1, characterized in that: A first guide sleeve (6) is sealed and fixedly provided on the front end plate (5) of the high-pressure gas chamber of the first gas storage bin. A first auxiliary piston (7) is slidably provided in the inner hole of the first guide sleeve (6) along the front-rear direction. The contact area between the first auxiliary piston (7) and the high-pressure gas in the high-pressure gas chamber is smaller than the contact area between the first trigger piston (9) and the high-pressure gas in the high-pressure gas chamber. The first trigger piston and the first auxiliary piston are fixedly connected via a first sleeve (8), and the first force transmission rod passes through the inner hole of the first sleeve.

8. The bidirectional explosion-proof equipment according to claim 1, characterized in that: A third sleeve (25) extending in the front-to-back direction is fixedly disposed in the first powder storage bin. The third sleeve (25) is respectively sealed and fixedly connected to the front end plate and the rear end plate of the fire extinguishing powder storage chamber of the first powder storage bin. The first force transmission rod passes through the inner hole of the third sleeve.

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