Multi-directional double-opening automatic explosion-proof device for underground coal mines

Abstract

The present invention relates to a multi-directional double-opening coal mine underground automatic explosion-proof device, comprising a shock wave receiving rod, a piston cylinder and a piston body, a trigger hole is opened on the side wall of the piston cylinder, and the trigger holes are respectively connected to a powder spraying assembly; the powder spraying assembly comprises a vent pipe, and a trigger mechanism, a powder storage cover and a high-pressure air chamber installed on the vent pipe, when the boss is opposite to the trigger hole, the trigger mechanism blocks the connection between the high-pressure air chamber and the powder storage cover; when the boss moves to one side of the trigger hole, the high-pressure air chamber is connected to the powder storage cover. The present invention realizes the simultaneous eruption of multiple powder storage covers through the movement of the piston body, and has two powder storage covers in the same eruption direction, thereby increasing the concentration of the fire extinguishing powder after being sprayed, and greatly improving the explosion-proof effect; the trigger holes in the trigger hole group are relatively arranged, so that the radial force of the boss is balanced, the resistance to the movement of the piston body is reduced, and the flexibility of the piston body movement is improved, thereby improving the sensitivity of the explosion-proof device.

Description

Technical Field

[0001] The invention relates to the technical field of underground explosion-proofing in coal mines, and in particular to a multi-directional double-opening underground automatic explosion-proofing device in coal mines. Background Art

[0002] Explosion-proofing in underground coal mines is an important means to cut off the spread of explosion flames. At present, most commonly used explosion-proofing devices in China adopt a patent scheme with application number 2019101035195, named "A patent scheme of automatic two-way explosion-proofing equipment and use method for underground coal mines". The shock wave receiving part receives the impact force of the explosion shock wave, and uses the force transmitted by the shock wave receiving part to trigger the trigger mechanism. After triggering, the high-pressure gas in the high-pressure gas cavity sprays out the fire extinguishing powder in the powder storage cover to achieve explosion-proofing.

[0003] However, in the explosion-proof device of the above structural type, no matter it is bidirectional or unidirectional, at most two powder storage covers can be provided, and the spraying directions of the fire extinguishing powder of the two powder storage covers cannot be the same, resulting in poor concentration effect of the fire extinguishing powder after spraying, which is not conducive to improving the explosion-proof effect. Summary of the invention

[0004] In view of the deficiencies of the prior art, the present invention provides a multi-directional double-opening coal mine underground automatic explosion-proof device, which realizes the increase in the number of powder storage covers and the multi-directional spraying of fire extinguishing powder, and at the same time realizes the powder spraying of two powder storage covers in the same direction.

[0005] The present invention is realized by the following technical scheme, providing a multi-directional double-opening coal mine underground automatic explosion-proof device, comprising a shock wave receiving rod, a piston cylinder and a piston body slidably arranged in the piston cylinder, wherein the piston body is connected to the shock wave receiving rod;

[0006] The side wall of the piston cylinder is provided with at least two groups of trigger holes distributed along the axial direction, each of which includes at least two trigger holes arranged opposite to each other, and the two opposite trigger holes are respectively connected to the powder spraying assembly; the piston body includes a core shaft, and a plurality of bosses fixed on the core shaft and respectively opposite to the trigger holes;

[0007] The powder spraying assembly includes a vent pipe with one end fixed to the trigger hole, and a trigger mechanism, a powder storage cover and a high-pressure air chamber installed on the vent pipe. When the boss is opposite to the trigger hole, the action of the trigger mechanism is restricted, and the trigger mechanism blocks the connection between the high-pressure air chamber and the powder storage cover. When the boss moves to one side of the trigger hole, the height difference between the boss and the core shaft provides space for the action of the trigger mechanism, thereby losing the restriction on the action of the trigger mechanism, and the trigger mechanism moves along the trigger hole, and the high-pressure air chamber is connected to the powder storage cover.

[0008] When the explosion-proof device of this scheme is installed, the piston body is arranged along the length direction of the tunnel, compressed gas is stored through each high-pressure gas chamber, and fire extinguishing powder is stored through each powder storage cover. The movement of the piston body is used to control the actions of multiple trigger mechanisms. After the explosion occurs, multiple powder storage covers are sprayed simultaneously, thereby improving the explosion-proof effect.

[0009] As an optimization, the trigger mechanism includes a trigger shaft slidably arranged in the ventilation pipe, and the trigger shaft is provided with a sealing section which is sealingly and slidingly connected with the inner wall of the ventilation pipe; the ventilation pipe is provided with an injection hole connected to the powder storage cover and an air inlet hole connected to the high-pressure air cavity, and the injection hole is located between the air inlet hole and the trigger hole in the axial direction of the ventilation pipe, and the sealing section is located between the air inlet hole and the injection hole. The trigger mechanism of the optimized scheme is triggered by the axial movement of the trigger shaft along the ventilation pipe. When no explosion occurs, the boss is located opposite to the trigger hole, and the boss limits the movement of the trigger shaft along the ventilation pipe, and the sealing section of the trigger shaft is used to cut off the connection between the high-pressure gas chamber and the powder storage cover. When an explosion occurs, the shock wave receiving rod is pushed by the shock wave, thereby pushing the piston body to move axially along the piston cylinder, so that the boss moves to one side of the trigger hole, loses its blocking effect on the trigger shaft, and provides space for the movement of the trigger shaft. Each trigger shaft moves respectively under the action of the high-pressure gas in the high-pressure gas chamber, and the sealing section of the trigger shaft leaves the air inlet and the jet hole, so that the high-pressure gas chamber is connected with the powder storage cover, and the fire extinguishing powder in the powder storage cover is sprayed into the tunnel by the high-pressure gas, thereby achieving explosion isolation.

[0010] As an optimization, there are two trigger hole groups, one powder storage cover in each powder spraying assembly, and the two powder storage covers adjacent to each other along the axial direction of the piston cylinder have opposite spraying directions, while the two powder storage covers adjacent to each other along the radial direction of the piston cylinder have the same spraying direction. This optimization scheme sets four powder storage covers. In practical applications, two of the powder storage covers can spray fire extinguishing powder toward the front of the explosion-proof device, and the other two powder storage covers can spray fire extinguishing powder toward the back of the explosion-proof device. This not only realizes the spraying in four directions, but also increases the concentration of the fire extinguishing powder after the spraying, thereby improving the explosion-proof effect.

[0011] As an optimization, a trigger ball is also provided between the trigger shaft and the boss, and the piston body is provided with roll-off grooves on both sides of the boss, and the depth of the roll-off grooves is greater than the diameter of the trigger ball. This optimization scheme is conducive to shortening the length of the trigger shaft by setting the trigger ball, thereby facilitating the reduction of the overall dimensions of the explosion-proof device and saving installation space. At the same time, the point contact between the trigger ball and the boss is utilized to reduce the resistance of the piston body movement, making the triggering of the device more sensitive. The roll-off groove is provided to provide accommodation space for the trigger ball, ensuring the reliable movement of the trigger shaft.

[0012] As an optimization, end caps are fixed at both ends of the piston cylinder, and through holes are provided on the end caps for the shock wave receiving rod to pass through. This optimization scheme prevents the trigger ball from falling from the piston cylinder by providing the end caps, and facilitates repeated use.

[0013] As an optimization, the boss is closed along the circumference, the cross section of the boss is trapezoidal, and the end of the boss facing the trigger hole is the short side. This optimization scheme sets the boss to be closed along the circumference, and the action on the two trigger shafts can be achieved through one boss. The guidance of the trapezoidal inclined surface allows the trigger ball to quickly roll along the inclined surface to the rolling groove on one side of the trigger shaft after passing through the trigger hole, thereby improving the sensitivity of the trigger shaft moving along the ventilation pipe.

[0014] As an optimization, three bosses are provided on the mandrel, and the bosses on both sides correspond to the two groups of trigger holes respectively. A tightening bolt that pushes to the middle boss is pierced through the wall of the piston cylinder, and the tightening bolt is connected to the wall of the piston cylinder by threads. The setting of this optimization scheme not only realizes the control effect of the boss on the trigger shaft, but also tightens the piston body by the tightening bolt to achieve relative fixation between the piston cylinder and the piston body, avoiding the movement of the trigger shaft. After the underground installation is completed, the tightening bolt can be removed.

[0015] As an optimization, the end of the trigger shaft that contacts the trigger ball is an arc surface, and the arc surface is tangent to the trigger ball. This optimization scheme reduces the contact area between the trigger shaft and the trigger ball by setting the arc surface, and when the trigger ball is pushed to the rolling groove on the side of the boss, the separation of the trigger shaft and the trigger ball is faster, thereby further improving the sensitivity of the device triggering.

[0016] As an optimization, an external thread section is provided at one end of the vent pipe facing the piston cylinder, the external thread section is threadedly connected to the trigger hole, the inner hole diameter of the external thread section is adapted to the diameter of the trigger ball, and a fastening nut is threadedly connected to the external thread section. This optimization scheme facilitates the connection between the vent pipe and the piston cylinder by providing an external thread section, and facilitates the positioning of the trigger ball to improve the reliability of the trigger shaft pushing the trigger ball; it also facilitates the overall rotation of the vent pipe to adjust the powder spraying direction of the powder storage cover.

[0017] As an optimization, both ends of the piston body are connected to shock wave receiving rods. Through the setting of this optimization scheme, when an explosion occurs on either side of the front and back sides of the device, the piston body can be triggered to move, achieving an explosion-proof effect.

[0018] The beneficial effects of the present invention are as follows: through the movement of the piston body, the simultaneous spraying of multiple powder storage covers is realized, and there are two powder storage covers in the same spraying direction, thereby increasing the concentration of the fire extinguishing powder after spraying, and greatly improving the explosion-proof effect; the trigger holes in the trigger hole group are relatively arranged, so that the radial force of the boss is balanced, the resistance to the movement of the piston body is reduced, the flexibility of the piston body movement is improved, and thus the sensitivity of the explosion-proof device is improved; each trigger mechanism can act independently, and when in use, the number of powder spray assemblies can be selected according to actual needs to adapt to meet different working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0020] Figure 2 for Figure 1 Middle partial enlarged picture;

[0021] As shown in the figure:

[0022] 1. shock wave receiving rod, 2. piston cylinder, 3. piston body, 4. ventilation pipe, 5. high-pressure air chamber, 6. powder storage cover, 7. trigger shaft, 8. fastening nut, 9. tightening bolt, 10. core shaft, 11. boss, 12. trigger ball. DETAILED DESCRIPTION

[0023] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0024] like Figure 1 A multi-directional double-opening coal mine underground automatic explosion-proof device is shown, comprising a shock wave receiving rod 1, a piston cylinder 2 and a piston body 3 slidably arranged in the piston cylinder, both ends of the piston body are fixedly connected with shock wave receiving rods, and both shock wave receiving rods are connected to the piston body through threads, and both ends of the piston cylinder are fixed with end covers, and the end covers are provided with through holes for the shock wave receiving rods to pass through, and the end covers are connected to the piston cylinder by bolts. A receiving plate and a hanging device are installed on the shock wave receiving rod 1, and the receiving plate is used to receive the impact force of the shock wave, and the hanging device realizes the hanging installation of the explosion-proof device.

[0025] Two groups of trigger holes distributed along the axial direction are provided on the side wall of the piston cylinder. Each trigger hole group includes two trigger holes arranged radially opposite to each other. The two opposite trigger holes are respectively connected to the powder spraying assembly. There are four sets of spraying assemblies in total, and two sets are respectively provided on both sides of the piston cylinder along the width direction of the lane.

[0026] The piston body includes a core shaft 10, and a plurality of bosses 11 fixed on the core shaft and respectively opposite to the trigger holes. The bosses are closed along the circumferential direction, and the outer diameter of the bosses is larger than the core shaft diameter and is adapted to the inner diameter of the piston barrel. The bosses can slide relative to the inner wall of the piston barrel, and the bosses are arranged between the two trigger holes arranged opposite to each other in the same trigger hole group. The cross section of the boss is trapezoidal, and the end of the boss facing the trigger hole is the short side. By using the inclined surface of the trapezoid, the trigger ball can quickly roll along the inclined surface to the rolling groove on one side of the trigger shaft after passing through the trigger hole, thereby improving the sensitivity of the trigger shaft moving along the ventilation pipe. Three bosses are arranged on the core shaft of this embodiment, and the bosses on both sides correspond to the two groups of trigger holes respectively. A tightening bolt 9 is provided on the wall of the piston barrel to push against the middle boss, and the tightening bolt 9 is connected to the wall of the piston barrel 2 by a thread. During transportation, the piston body is tightened by the tightening bolt to achieve relative fixation between the piston barrel and the piston body to avoid the action of the trigger shaft. After the underground installation is completed, the tightening bolt can be removed.

[0027] The powder spray assembly includes a vent pipe 4 with one end fixed to the trigger hole, a trigger mechanism installed on the vent pipe, a powder storage cover 6 and a high-pressure air chamber 5. The high-pressure air chamber 5 is used to store compressed air, and the powder storage cover 6 is used to place fire extinguishing powder. When the boss is opposite to the trigger hole, the trigger mechanism is restricted from moving, and the trigger mechanism blocks the connection between the high-pressure air chamber and the powder storage cover; when the boss moves to one side of the trigger hole, the trigger mechanism moves along the trigger hole, and the high-pressure air chamber is connected to the powder storage cover.

[0028] Specifically, the trigger mechanism includes a trigger shaft 7 slidably arranged in the vent pipe, a sealing section sealingly slidingly connected with the inner wall of the vent pipe is provided on the trigger shaft, the trigger shaft is coaxially arranged with the corresponding trigger hole, and the diameter of the trigger shaft facing the trigger hole is smaller than the inner diameter of the trigger hole, so that the trigger shaft can pass through the trigger hole. The vent pipe and the piston cylinder are perpendicular to each other, each high-pressure air chamber, the vent pipe and the piston cylinder are located in the same transverse plane, the high-pressure air chamber is fixedly connected to the end of the vent pipe away from the piston cylinder by a thread, and the high-pressure air chamber is coaxially arranged with the vent pipe. The vent pipe is provided with an injection hole connected to the powder storage cover and an air inlet hole connected to the high-pressure air chamber, and the injection hole is located between the air inlet hole and the trigger hole in the axial direction of the vent pipe, the sealing section is located between the air inlet hole and the injection hole, the sealing section is provided with a sealing groove, and a sealing gasket is provided in the sealing groove.

[0029] The relative position relationship between the trigger shaft and the jet hole satisfies: when the boss is opposite to the trigger hole, the trigger shaft is restricted from moving along the ventilation pipe, and the sealing section of the trigger shaft blocks the connection between the high-pressure air cavity and the powder storage cover; when the boss moves to one side of the trigger hole, the trigger shaft moves away from the high-pressure air cavity along the ventilation pipe, the sealing section of the trigger shaft leaves between the air inlet hole and the jet hole, and the high-pressure air cavity is connected to the powder storage cover through the inner cavity of the ventilation pipe and the jet hole.

[0030] There are two trigger hole groups in this embodiment, and there is one powder storage cover in each powder spraying assembly. The two powder storage covers adjacent to each other along the axial direction of the piston cylinder have opposite spraying directions, and the two powder storage covers adjacent to each other along the radial direction of the piston cylinder have the same spraying direction. The spraying directions of the four powder storage covers are all parallel to the axial direction of the piston cylinder.

[0031] In order to reduce the overall lateral size of the explosion-proof device, a trigger ball 12 is further provided between the trigger shaft and the boss in this embodiment. The end of the trigger shaft that contacts the trigger ball is an arc surface, and the arc surface is circumscribed with the trigger ball to better separate the trigger shaft from the trigger ball. The piston body is provided with rolling grooves located on both sides of the boss. The groove depth and the axial length of the rolling groove are both greater than the diameter of the trigger ball. The rolling groove in this embodiment is formed by the height difference between the boss and the core shaft.

[0032] An external thread section is provided at one end of the vent pipe facing the piston cylinder, and the external thread section is threadedly connected to the trigger hole. The inner hole diameter of the external thread section is adapted to the diameter of the trigger ball. A fastening nut 8 is threadedly connected to the external thread section, and the fastening nut is provided to prevent the external thread section from loosening with the trigger hole. The threaded connection between the external thread section of the vent pipe and the piston cylinder also facilitates the adjustment of the inclination angle of the spray end of the powder storage cover according to the installation site conditions.

[0033] When in use, the device is hung on the top of the tunnel, the piston cylinder and the shock wave receiving rod are extended along the length of the tunnel, and the high-pressure air cavity and the powder storage cover are distributed on both sides of the piston cylinder along the width of the tunnel to save the occupied height space. When no explosion occurs, the boss is located opposite to the trigger hole, and the trigger ball is located in the inner cavity of the external threaded section. Due to the setting of the boss, the trigger ball is prevented from moving, thereby limiting the axial movement of the trigger shaft along the ventilation pipe. At this time, the sealing section of the trigger shaft is used to cut off the connection between the high-pressure gas chamber and the powder storage cover; when an explosion occurs in front of or behind the device, the shock wave receiving part is pushed by the shock wave, and the receiving rod pushes the piston body to move axially along the piston cylinder, so that the boss moves to one side of the two trigger holes, and the trigger balls pass through the trigger holes and are pushed to the rolling groove along the inclined surface of the boss, providing space for the movement of the trigger shaft, losing the limiting effect on the trigger shaft, and the trigger shaft moves under the action of the high-pressure gas in the high-pressure gas chamber, thereby connecting the high-pressure gas chamber with the powder storage cover, and the fire extinguishing powder in the four powder storage covers is sprayed into the tunnel along four positions by the high-pressure gas, thereby achieving explosion isolation.

[0034] Of course, the above description is not limited to the above examples. Technical features not described in the present invention can be achieved by or by using existing technologies, which will not be described 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 changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not depart 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 multi-directional double-opening underground coal mine automatic explosion-proof device, comprising a shock wave receiving rod (1), characterized in that: It also includes a piston cylinder (2) and a piston body (3) slidably arranged in the piston cylinder, wherein the piston body is connected to the shock wave receiving rod; At least two groups of trigger holes distributed along the axial direction are formed on the side wall of the piston cylinder, each of which includes at least two trigger holes arranged opposite to each other, and the two opposite trigger holes are respectively connected to the powder spraying assembly; The piston body comprises a core shaft (10), and a plurality of bosses (11) fixedly arranged on the core shaft and respectively opposite to the trigger holes; A trigger ball (12) is also provided between the trigger shaft and the boss, and the piston body is provided with rolling grooves located on both sides of the boss, and the groove depth of the rolling groove is greater than the diameter of the trigger ball; The powder spray assembly comprises a vent pipe (4) with one end fixedly connected to the trigger hole, a trigger mechanism, a powder storage cover (6) and a high-pressure air chamber (5) installed on the vent pipe. When the boss is opposite to the trigger hole, the trigger mechanism is restricted from moving, and the trigger mechanism blocks the connection between the high-pressure air chamber and the powder storage cover. When the boss moves to one side of the trigger hole, the trigger mechanism moves along the trigger hole, and the high-pressure air chamber is connected to the powder storage cover. The trigger mechanism comprises a trigger shaft (7) slidably arranged in the ventilation pipe, the trigger shaft being provided with a sealing section which is in sealing and sliding connection with the inner wall of the ventilation pipe; the ventilation pipe is provided with an air jet hole connected to the powder storage cover and an air inlet hole connected to the high-pressure air cavity, the air jet hole is located between the air inlet hole and the trigger hole in the axial direction of the ventilation pipe, and the sealing section is located between the air inlet hole and the air jet hole; Both ends of the piston body are connected with shock wave receiving rods.

2. The multi-directional double-opening underground coal mine automatic explosion-proof device according to claim 1 is characterized in that: There are two trigger hole groups, one powder storage cover in each powder spraying assembly, and the spraying directions of two powder storage covers adjacent to each other along the axial direction of the piston cylinder are opposite, while the spraying directions of two powder storage covers adjacent to each other along the radial direction of the piston cylinder are the same.

3. The multi-directional double-opening underground coal mine automatic explosion-proof device according to claim 1 is characterized in that: End covers are respectively fixedly arranged at both ends of the piston cylinder, and through holes for the shock wave receiving rod to pass through are opened on the end covers.

4. The multi-directional double-opening underground coal mine automatic explosion-proof device according to claim 1 is characterized in that: The boss is closed along the circumferential direction, the cross section of the boss is trapezoidal, and the end of the boss facing the trigger hole is the short side.

5. The multi-directional double-opening underground coal mine automatic explosion-proof device according to claim 4 is characterized in that: The core shaft is provided with three bosses, the bosses on both sides respectively corresponding to the two groups of trigger holes, and a tightening bolt (9) is passed through the wall of the piston cylinder and pressed against the middle boss, and the tightening bolt (9) is connected to the wall of the piston cylinder (2) by threads.

6. The multi-directional double-opening underground coal mine automatic explosion-proof device according to claim 1 is characterized in that: One end of the trigger shaft that contacts the trigger ball is an arc surface, and the arc surface is circumscribed with the trigger ball.

7. The multi-directional double-opening underground coal mine automatic explosion-proof device according to claim 1 is characterized in that: An end of the vent pipe facing the piston cylinder is provided with an external thread section, the external thread section is threadedly connected to the trigger hole, the inner hole diameter of the external thread section is matched to the diameter of the trigger ball, and a fastening nut (8) is threadedly connected to the external thread section.

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