Bidirectional explosion-proof device and its use method

Abstract

The present invention provides a bidirectional explosion-proof device, comprising two shock wave receiver assemblies arranged opposite to each other, a trigger mechanism provided between the two shock wave receiver assemblies, a double flange provided above the trigger mechanism, a crank mechanism installed inside the double flange, the crank mechanism and the double flange forming a rotary pair through a first pin shaft, the trigger mechanism comprising a bracket, a gear, a rack, a gear shaft, and a compression spring, the rack being laterally fixed on the bracket, the gear being meshed with the rack, and the gear being connected to the gear shaft. The present invention also provides a method for using the bidirectional explosion-proof device. The bidirectional explosion-proof device of the present invention can trigger the triggering action of the bidirectional explosion-proof device when an explosion shock occurs in one direction in the tunnel, thereby forming multiple flame barrier layers in the tunnel, quickly extinguishing the spread of the flame and reducing personal injury. The present invention realizes the locking and unlocking of the crank mechanism through a crank locking mechanism, and has a simple and reliable structure.

Description

Technical Field

[0001] The invention belongs to the technical field of explosion-proof devices for underground coal mines and relates to a bidirectional explosion-proof device and a use method thereof. Background Art

[0002] The main function of explosion-proof devices in underground coal mine tunnels is to automatically spray fire-extinguishing materials when a gas or coal dust explosion occurs in the tunnel, preventing the flame from spreading further and causing a more harmful secondary explosion. The explosion-proof device installed above the tunnel senses the intensity of the explosion and flame propagation shock wave. When the shock wave reaches the operating pressure, the explosion-proof device is activated, spraying dry fire extinguishing powder, forming a flame-blocking zone in the area of ​​the explosion-proof device. By arranging multiple explosion-proof devices along the underground tunnel, multiple flame-blocking zones can be formed to prevent the spread of flames. Existing underground explosion-proof devices are one-way explosion-proof devices. Each explosion-proof device can only achieve the formation of a flame-blocking zone by activating the explosion-proof device in a fixed single direction under the action of the shock wave. Because the location of the underground explosion source is difficult to predict in advance, the direction of the shock wave and flame spread generated is uncertain. Explosion-proof devices activated in a single direction cannot reliably block the flame, and usually two sets of explosion-proof devices in opposite directions must be installed. The need to install two explosion-proof devices in the same location is both costly and time-consuming. Furthermore, the sudden eruption of a gas explosion upon activation of either device creates unpredictable disturbances within the facility, disrupting the preset activation threshold of the other device and making the overall reliability and stability uncontrollable. To address this issue, a bidirectional explosion-proof device is needed that can activate the devices in response to shock waves from any direction, creating a flame barrier. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention provides a bidirectional explosion-proof device and a method of use.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0005] A bidirectional explosion-proof device includes two oppositely arranged shock wave receiver assemblies, a trigger mechanism is provided between the two shock wave receiver assemblies, a double flange is provided above the trigger mechanism, a crank mechanism is installed inside the double flange, the crank mechanism and the double flange form a rotary pair through a first pin shaft, the trigger mechanism includes a bracket, a gear, a rack, a gear shaft, and a compression spring, the rack is laterally fixed on the bracket, the gear is meshed with the rack, the gear is connected to the gear shaft, a compression spring is sleeved on the outer periphery of the gear shaft, the bracket is fixed to the double flange, cylinders are respectively installed on the left and right sides of the double flange, a push shaft and a piston are installed in the cylinder, the push shaft is in contact with the crank mechanism, a high-pressure gas storage is installed at the end of each cylinder, the high-pressure gas storage is filled with high-pressure gas, a fire extinguishing powder storage bin is installed on the periphery of the cylinder and the high-pressure gas storage bin, and the fire extinguishing powder storage bin is filled with fire extinguishing powder.

[0006] Furthermore, the shock wave receiver assembly includes a receiver, a push rod, and a first hanging anchor rod. The push rod is coaxial with the rack of the trigger mechanism, there is a gap between the first end of the push rod and the rack, the second end of the push rod is fixed to the receiver, and the first hanging anchor rod is provided on the push rod.

[0007] Furthermore, the double flange includes a cylindrical body, with flange plates respectively provided on the left and right sides of the cylindrical body, a rectangular through groove is axially opened at the center of the cylindrical body, a first groove is provided at a corresponding position on one side of the rectangular through groove of the cylindrical body, a second groove is provided at a corresponding position on the other side of the rectangular through groove, a first circular hole is provided at a corresponding position on the cylinder wall of the cylindrical body, and a second circular hole is provided at the center of each flange plate, and the position of the second circular hole corresponds to the position of the push shaft in the cylinder.

[0008] Furthermore, the bidirectional explosion-proof device also includes a crank locking mechanism, which is installed on the crank mechanism. The crank mechanism includes a double crank and a sleeve. The double crank is provided with a first through hole in a vertical direction, and a pin hole is provided at one end of the double crank away from the first through hole. A third groove and a fourth groove are provided on the left and right sides of the double crank, respectively. Second through holes are provided at corresponding positions on both sides of the third groove, and third through holes are provided at corresponding positions on both sides of the fourth groove. Sleeves are installed in the third groove and the fourth groove respectively through second pin shafts, and the sleeves are in contact with the push shaft.

[0009] The crank locking mechanism includes a bolt, an inner locking plate, an outer locking plate and a nut. The bolt is installed in the first through hole of the double crank in the vertical direction, and the outer locking plate is sleeved on the upper end of the bolt. The outer locking plate is placed above the upper end surface of the double crank, and the outer locking plate is pressed on the first groove of the double flange cylinder. The inner locking plate is sleeved on the lower end of the bolt, and a nut is installed at the lower end of the inner locking plate to press the inner locking plate against the lower end surface of the double crank. When in the locked state, the inner locking plate and the rectangular through groove of the double flange cylinder are perpendicular or cross-shaped, and the double crank is locked. When in the unlocked state, the inner locking plate and the rectangular through groove of the double flange cylinder are parallel, and the double crank can rotate.

[0010] Furthermore, the bracket includes a vertical plate, a first base and a second base, and a horizontally arranged first base and a second base are respectively provided at both ends of the vertical plate, and the first base and the second base are respectively provided with a fourth through hole and a fifth through hole, and the first base is fixed to the upper end surface of the second groove of the double-flange cylinder by bolts, and a mounting groove is provided under the second base of the vertical plate, the upper end of the gear shaft extends through the fourth through hole, and the lower end of the gear shaft extends through the fifth through hole of the second base and is connected to the gear, and the second base is placed above the gear, and a rectangular groove is provided at the top of the gear shaft.

[0011] Furthermore, a gasket is provided between the compression spring and the second base.

[0012] Furthermore, the cylinder and the double flange are fixed by bolts.

[0013] Furthermore, a plurality of inclined air release holes are provided at the end of the cylinder along the circumferential direction.

[0014] Furthermore, the inner locking plate is a rectangular block, and the two side surfaces corresponding to the length direction of the rectangular block are arc surfaces. A third circular hole is provided in the center of the rectangular block, and the width W1 of the rectangular block is smaller than the width W2 of the rectangular through groove of the double-flange cylindrical body, and the length L1 of the rectangular block is greater than the width W2 of the rectangular through groove of the double-flange cylindrical body.

[0015] The present invention also provides a method for using a bidirectional explosion-proof device, comprising the following steps:

[0016] Step 1: Install the two shock wave receiver assemblies of the bidirectional explosion-proof device below the roof of the tunnel to be protected. Install the fire extinguishing powder storage bin below the roof of the tunnel to be protected through the second hanging anchor rod and between the two shock wave receiver assemblies. Adjust the double crank to the locked state.

[0017] Step 2. When an explosion shock wave is generated in the tunnel, it acts on the shock wave receiver assembly in one direction in the tunnel. The shock wave receiver assembly pushes the rack to move, and the rack meshes with the gear. The movement of the rack drives the gear to rotate, and the gear shaft rotates synchronously with the gear. When the gear shaft rotates, it will drive the inner lock plate to rotate at the same time. When it rotates to a position parallel to the rectangular through groove of the cylindrical body of the double flange, the double crank is forced to rotate along the pin shaft inside the double flange. At this time, the balance state of the crank mechanism is broken. The rotary motion of the double crank causes the pistons and push shafts in the two cylinders to move toward the double flange direction at the same time under the action of the high-pressure gas in the high-pressure gas chamber. The high-pressure gas in the two high-pressure gas chambers will be discharged from the venting inclined hole into the fire extinguishing powder storage chamber. Under the action of the high-pressure gas, the fire extinguishing powder is ejected to the outside of the fire extinguishing powder storage chamber along with the high-pressure gas, forming a flame blocking area on both sides at the same time.

[0018] Compared with the existing technology, the present invention offers the following advantages: The bidirectional explosion-proof device of the present invention can trigger a triggering action in the event of an explosion shock in either direction within the tunnel, forming multiple flame barriers within the tunnel, rapidly blocking the spread of flames and reducing personal injury. Furthermore, the present invention can adjust the compression of the compression spring by increasing or decreasing the number of gaskets, thereby adjusting the pressure between the inner locking plate and the double flanges, thereby adjusting the activation force of the shock wave receiver assembly trigger rack. The present invention utilizes a crank locking mechanism to achieve locking and unlocking of the crank mechanism, resulting in a simple and reliable structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1It is a schematic diagram of the installation structure of the present invention;

[0020] Figure 2 is a cross-sectional view of the present invention;

[0021] Figure 3 It is an enlarged schematic diagram of the installation structure of the first hanging anchor rod, trigger mechanism, crank locking mechanism, double crank, double flange, push shaft, piston, high-pressure gas chamber, and fire extinguishing powder storage chamber;

[0022] Figure 4 It is a structural diagram of the bracket;

[0023] Figure 5 It is a cross-sectional view of a double flange;

[0024] Figure 6 It is a schematic diagram of the bottom structure of the double flange;

[0025] Figure 7 It is a schematic diagram of the structure of the double crank;

[0026] Figure 8 It is a structural diagram of the gear shaft;

[0027] Figure 9 It is a structural diagram of the inner locking plate;

[0028] Figure 10 yes Figure 9 The main view;

[0029] Figure 11 is a cross-sectional view of the inner locking plate;

[0030] Figure 12 It is a schematic diagram of the three-dimensional structure of the cylinder;

[0031] Figure 13 It is a structural diagram of the fire extinguishing powder storage bin and the sealing membrane;

[0032] Among them, 1. shock wave receiver assembly, 11. receiver, 12. first hanging anchor rod, 13. push rod, 2. trigger mechanism, 21. bracket, 211. vertical plate, 212. first base, 213. second base, 214. fourth through hole, 215. fifth through hole, 216. mounting groove, 22. gear, 23. rack, 24. gear shaft, 241. rectangular groove, 25. compression spring, 26. gasket, 3. double flange, 31. cylinder, 32. flange, 33. rectangular through groove, 34. first groove, 35. second groove, 36. first circular hole, 37. Second circular hole, 4, crank mechanism, 41, double crank, 42, first through hole, 43, pin hole, 44, third groove, 45, fourth groove, 46, second through hole, 47, third through hole, 48, second pin shaft, 49, sleeve, 5, crank locking mechanism, 51, bolt, 52, inner locking plate, 521, third circular hole, 53, outer locking plate, 54, nut, 6, cylinder, 61, venting inclined hole, 7, push shaft, 8, piston, 9, high-pressure gas chamber, 10, fire extinguishing powder storage chamber, 101, sealing membrane, 20, first pin shaft; 30, second hanging anchor rod, 40, fixing sleeve. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] Example

[0035] Reference Figure 1-Figure 3 , a bidirectional explosion-proof device, comprising two shock wave receiver assemblies 1 arranged opposite to each other, a trigger mechanism 2 is provided between the two shock wave receiver assemblies 1, a double flange 3 is provided above the trigger mechanism 2, a crank mechanism 4 is installed inside the double flange 3, the crank mechanism 4 and the double flange 3 form a rotary pair through a first pin shaft 20, the trigger mechanism 2 comprises a bracket 21, a gear 22, a rack 23, a gear shaft 24, a compression spring 25 (the structure of the gear shaft 24 refers to Figure 8), the rack 23 is laterally fixed on the bracket 21, the gear 22 is meshed with the rack 23, the gear 22 is connected to the gear shaft 24, a compression spring 25 is mounted on the periphery of the gear shaft 24, the bracket 21 is fixed to the double flange 3, and a cylinder 6 is installed on the left and right sides of the double flange 3 respectively, a push shaft 7 and a piston 8 are installed in the cylinder 6, the push shaft 7 is in contact with the crank mechanism 4, and a high-pressure gas warehouse 9 is installed at the end of each cylinder 6, the cylinder 6 and the high-pressure gas warehouse 9 are fixed by welding, the high-pressure gas warehouse 9 is filled with high-pressure gas, and a fire extinguishing powder storage warehouse 10 is installed on the periphery of the cylinder 6 and the high-pressure gas warehouse 9, and the fire extinguishing powder storage warehouse 10 is filled with fire extinguishing powder.

[0036] The fire extinguishing powder storage bin 10 is connected to the cylinder 6 by a fixing sleeve 40, which is fixed to the cylinder 6 by bolts, and fixed to the fire extinguishing powder storage bin 10 by welding. A sealing film 101 is provided at the end of the fire extinguishing powder storage bin 10. The fire extinguishing powder is loaded into the fire extinguishing powder storage bin 10 and sealed with the sealing film 101 (refer to Figure 13 ).

[0037] The shock wave receiver assembly 1 includes a receiver 11, a push rod 13, and a first hanging anchor rod 12. The push rod 13 is coaxial with the rack 23 of the trigger mechanism 2. There is a gap between the first end of the push rod 13 and the rack 23. The second end of the push rod 13 is fixed to the receiver 11, and the first hanging anchor rod 12 is provided on the push rod 13.

[0038] Reference Figure 5-Figure 6 The double flange 3 includes a cylindrical body 31, with flanges 32 provided on the left and right sides of the cylindrical body 31 respectively. A rectangular through groove 33 is axially opened in the center of the cylindrical body 31, a first groove 34 is provided at a corresponding position on one side of the rectangular through groove 33 of the cylindrical body 31, and a second groove 35 is provided at a corresponding position on the other side of the rectangular through groove 33. A first circular hole 36 is opened at a corresponding position on the cylinder wall of the cylindrical body 31, and a second circular hole 37 is provided at the center of each flange 32. The position of the second circular hole 37 corresponds to the position of the push shaft 7 in the cylinder 6.

[0039] Reference Figure 2-Figure 3 The bidirectional explosion-proof device also includes a crank locking mechanism 5, which is installed on a crank mechanism 4. The crank mechanism 4 includes a double crank 41 and a sleeve 49 (the double crank 41 structure refers to Figure 7), a first through hole 42 is provided in the vertical direction on the double crank 41, a pin hole 43 is provided on the end of the double crank 41 away from the first through hole 42, a third groove 44 and a fourth groove 45 are provided on the left and right sides of the double crank 41, respectively, a second through hole 46 is provided at corresponding positions on both sides of the third groove 44, and a third through hole 47 is provided at corresponding positions on both sides of the fourth groove 45, a sleeve 49 is installed in the third groove 44 and the fourth groove 45 respectively via a second pin shaft 48, and the two ends of the double crank 41 respectively form a rotary pair through the second pin shaft 48 and the sleeve 49, and the sleeve 49 is in contact with the push shaft 7;

[0040] Reference Figure 3 The crank locking mechanism 5 includes a bolt 51, an inner locking plate 52, an outer locking plate 53 and a nut 54. The bolt 51 is installed in the first through hole 42 of the double crank 41 along the vertical direction. The outer locking plate 53 is installed on the upper end of the bolt 51. The outer locking plate 53 is placed above the upper end surface of the double crank 41 and presses on the first groove 34 of the cylindrical body 31 of the double flange 3. The inner locking plate 52 is installed on the lower end of the bolt 51. The lower end of the inner locking plate 52 is locked. A nut 54 is installed to press the inner locking plate 52 against the lower end surface of the double crank 41. When the double crank 41 is in a locked state, the inner locking plate 52 and the rectangular through groove 33 of the cylindrical body 31 of the double flange 3 are perpendicular or cross-shaped. There is a gap between the top surface of the gear shaft 24 and the double flange 3, and the double crank 41 is locked. When the double crank 41 is in an unlocked state, the inner locking plate 52 and the rectangular through groove 33 of the cylindrical body 31 of the double flange 3 are parallel, and the double crank 41 can rotate.

[0041] Reference Figure 4 The bracket 21 includes a vertical plate 211, a first base 212 and a second base 213. A horizontally arranged first base 212 and a second base 213 are respectively provided at both ends of the vertical plate 211. The first base 212 and the second base 213 are respectively provided with a fourth through hole 214 and a fifth through hole 215. The first base 212 is fixed to the upper end surface of the second groove 35 of the cylindrical body 31 of the double flange 3 by a bolt 51. A mounting groove 216 is provided below the second base 213 of the vertical plate 211. The rack 23 is fixed in the mounting groove 216. The upper end of the gear shaft 24 extends through the fourth through hole 214, and the lower end of the gear shaft 24 extends through the fifth through hole 215 of the second base 213 and is connected to the gear 22. The second base 213 is placed above the gear 22. The top of the gear shaft 24 is provided with a rectangular groove 241. The bottom end of the bolt 51 of the crank locking mechanism 5, the nut 54 and the inner locking plate 52 are placed in the rectangular groove 241.

[0042] A gasket 26 is provided between the compression spring 25 and the second base 213 , and the compression amount of the compression spring 25 can be adjusted by increasing or decreasing the number of gaskets 26 .

[0043] The cylinder 6 and the double flange 3 are fixed by bolts 51 .

[0044] Reference Figure 12 A plurality of degassing oblique holes 61 are provided along the circumferential direction at the end of the cylinder 6. In this embodiment, a total of 8 degassing oblique holes 61 are provided.

[0045] Reference Figures 9-11 The inner locking plate 52 is a rectangular block, and the two side surfaces corresponding to the length direction of the rectangular block are arc surfaces. A third circular hole 521 is provided in the center of the rectangular block, and the width W1 of the rectangular block is smaller than the width W2 of the rectangular through groove 33 of the cylindrical body 31 of the double flange 3, and the length L1 of the rectangular block is greater than the width W2 of the rectangular through groove 33 of the cylindrical body 31 of the double flange 3.

[0046] Reference Figures 1-13 The present invention also provides a method for using a bidirectional explosion-proof device, comprising the following steps:

[0047] Step 1. Reference Figure 1 , install the two shock wave receiver assemblies 1 of the bidirectional explosion-proof device below the roof of the tunnel to be protected. The fire extinguishing powder storage bin 10 is installed below the roof of the tunnel to be protected through the second hanging anchor 30 and is located between the two shock wave receiver assemblies 1. Adjust the double crank 41 to the locked state;

[0048] Step 2: When an explosion shock wave is generated in the tunnel, it acts on the shock wave receiver assembly 1 in one direction in the tunnel. The shock wave receiver assembly 1 pushes the rack 23 to move, and the rack 23 engages with the gear 22. The movement of the rack 23 drives the gear 22 to rotate, and the gear shaft 24 rotates synchronously with the gear 22. When the gear shaft 24 rotates, it drives the inner locking plate 52 to rotate at the same time. When it rotates to a position parallel to the rectangular through groove 33 of the cylindrical body 31 of the double flange 3, the double crank 41 is in an unlocked state, and the double crank 41 is subjected to force The interior of the double flange 3 rotates along the second pin shaft 48. At this time, the balanced state of the crank mechanism 4 is broken. The rotary motion of the double crank 41 causes the pistons 8 and the push shaft 7 in the two cylinders 6 to move toward the double flange 3 at the same time under the action of the high-pressure gas in the high-pressure gas storage chamber 9. The high-pressure gas in the two high-pressure gas storage chambers 9 will be discharged from the venting inclined hole 61 into the fire extinguishing powder storage chamber 10. Under the action of the high-pressure gas, the fire extinguishing powder will break through the sealing membrane 101 along with the high-pressure gas and spray to the outside of the fire extinguishing powder storage chamber 10, forming flame blocking areas on both sides at the same time.

[0049] The present invention adjusts the compression of the compression spring 25 by increasing or decreasing the number of gaskets 26, thereby adjusting the pressure between the inner locking plate 52 and the double flange 3. This pressure is the positive pressure between the inner locking plate 52 and the double flange 3. The greater the pressure, the greater the friction between the inner locking plate 52 and the double flange 3, and the greater the force required to activate the rack 23. Through this adjustment method, the rack 23 will not move under a relatively small force. The rack 23 will only move when the force applied to it exceeds the impact force generated by the receiver 11 at a set shock wave pressure value.

[0050] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. Bidirectional explosion-proof device, characterized in that: The invention comprises two shock wave receiver assemblies arranged opposite to each other, a trigger mechanism is provided between the two shock wave receiver assemblies, a double flange is provided above the trigger mechanism, a crank mechanism is installed inside the double flange, the crank mechanism and the double flange form a rotary pair through a first pin shaft, the trigger mechanism comprises a bracket, a gear, a rack, a gear shaft, and a compression spring, the rack is transversely fixed to the bracket, the gear is meshed with the rack, the gear is connected to the gear shaft, a compression spring is sleeved on the outer periphery of the gear shaft, the bracket is fixed to the double flange, a cylinder is respectively installed on the left and right sides of the double flange, a push shaft and a piston are installed in the cylinder, the push shaft is in contact with the crank mechanism, a high-pressure gas chamber is installed at the end of each cylinder, the high-pressure gas chamber is filled with high-pressure gas, a fire extinguishing powder storage chamber is installed on the periphery of the cylinder and the high-pressure gas chamber, and the fire extinguishing powder storage chamber is filled with fire extinguishing powder; The double flange includes a cylindrical body, flanges are provided on the left and right sides of the cylindrical body respectively, a rectangular through-slot is opened axially in the center of the cylindrical body, a first groove is provided at a corresponding position on one side of the rectangular through-slot of the cylindrical body, a second groove is provided at a corresponding position on the other side of the rectangular through-slot, a first circular hole is opened at a corresponding position on the cylinder wall of the cylindrical body, and a second circular hole is provided at the center of each flange, and the position of the second circular hole corresponds to the position of the thrust shaft in the cylinder; The bidirectional explosion-proof device also includes a crank locking mechanism, which is installed on the crank mechanism. The crank mechanism includes a double crank and a sleeve. The double crank is provided with a first through hole in a vertical direction, and a pin hole is provided on one end of the double crank away from the first through hole. A third groove and a fourth groove are provided on the left and right sides of the double crank respectively. Second through holes are provided at corresponding positions on both sides of the third groove, and third through holes are provided at corresponding positions on both sides of the fourth groove. Sleeves are installed in the third groove and the fourth groove respectively through second pin shafts, and the sleeves are in contact with the push shaft. The crank locking mechanism includes a bolt, an inner locking plate, an outer locking plate and a nut, wherein the bolt passes through the first through hole of the double crank in a vertical direction, and the outer locking plate is sleeved on the upper end of the bolt, and the outer locking plate is placed above the upper end surface of the double crank, and the outer locking plate is pressed on the first groove of the double-flange cylinder. The inner locking plate is sleeved on the lower end of the bolt, and a nut is installed at the lower end of the inner locking plate to press the inner locking plate against the lower end surface of the double crank. When in the locked state, the inner locking plate and the rectangular through groove of the double-flange cylinder are perpendicular or cross-shaped, and the double crank is locked. When in the unlocked state, the inner locking plate and the rectangular through groove of the double-flange cylinder are parallel, and the double crank can rotate. The bracket includes a vertical plate, a first base and a second base. The first base and the second base are horizontally arranged at both ends of the vertical plate respectively. The first base and the second base are respectively provided with a fourth through hole and a fifth through hole. The first base is fixed to the upper end surface of the second groove of the double-flange cylinder by bolts. A mounting groove is provided under the second base of the vertical plate. The upper end of the gear shaft extends through the fourth through hole, and the lower end of the gear shaft extends through the fifth through hole of the second base and is connected to the gear. The second base is placed above the gear, and the top of the gear shaft is provided with a rectangular groove.

2. The bidirectional explosion-proof device according to claim 1, characterized in that: The shock wave receiver assembly includes a receiver, a push rod, and a first hanging anchor rod. The push rod is coaxial with the rack of the trigger mechanism, and there is a gap between the first end of the push rod and the rack. The second end of the push rod is fixed to the receiver, and the first hanging anchor rod is provided on the push rod.

3. The bidirectional explosion-proof device according to claim 1, characterized in that: A gasket is provided between the compression spring and the second base.

4. The bidirectional explosion-proof device according to claim 1, characterized in that: The cylinder and the double flanges are fixed by bolts.

5. The bidirectional explosion-proof device according to claim 1, characterized in that: A plurality of air release inclined holes are provided at the end of the cylinder along the circumferential direction.

6. The bidirectional explosion-proof device according to claim 1, characterized in that: The inner locking plate is a rectangular block, and the two side surfaces corresponding to the length direction of the rectangular block are arc surfaces. A third circular hole is provided in the center of the rectangular block, and the width W1 of the rectangular block is smaller than the width W2 of the rectangular through groove of the double-flange cylindrical body, and the length L1 of the rectangular block is greater than the width W2 of the rectangular through groove of the double-flange cylindrical body.

7. The method for using the bidirectional explosion-proof device according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1: Install the two shock wave receiver assemblies of the bidirectional explosion-proof device below the roof of the tunnel to be protected. Install the fire extinguishing powder storage bin below the roof of the tunnel to be protected through the second hanging anchor rod and between the two shock wave receiver assemblies. Adjust the double crank to the locked state. Step 2. When an explosion shock wave is generated in the tunnel, it acts on the shock wave receiver assembly in one direction in the tunnel. The shock wave receiver assembly pushes the rack to move, and the rack meshes with the gear. The movement of the rack drives the gear to rotate, and the gear shaft rotates synchronously with the gear. When the gear shaft rotates, it will drive the inner lock plate to rotate at the same time. When it rotates to a position parallel to the rectangular through groove of the cylindrical body of the double flange, the double crank is forced to rotate along the pin shaft inside the double flange. At this time, the balance state of the crank mechanism is broken. The rotary motion of the double crank causes the pistons and push shafts in the two cylinders to move toward the double flange direction at the same time under the action of the high-pressure gas in the high-pressure gas chamber. The high-pressure gas in the two high-pressure gas chambers will be discharged from the venting inclined hole into the fire extinguishing powder storage chamber. Under the action of the high-pressure gas, the fire extinguishing powder is ejected to the outside of the fire extinguishing powder storage chamber along with the high-pressure gas, forming a flame blocking area on both sides at the same time.

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