Two-way double-storage type underground coal mine automatic explosion-proof device

Abstract

The present invention relates to a two-way double-storage type underground automatic explosion-proof device for coal mines, comprising a shock wave receiving rod, a piston cylinder and a piston body slidably arranged in the piston cylinder, the piston body being connected to the shock wave receiving rod; two trigger holes arranged opposite to each other are provided on the side wall of the piston cylinder, the two opposite trigger holes are respectively connected to a powder spraying assembly, and a boss opposite to the trigger hole is fixedly arranged on the piston body; the powder spraying assembly comprises a vent pipe fixedly connected to the trigger hole, a trigger shaft slidably arranged in the vent pipe, and a powder storage cover and a high-pressure air cavity fixedly connected to the vent pipe, the vent pipe is provided with an injection hole 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 vent pipe, and a sealing section sealingly slidingly connected to the inner wall of the vent pipe is provided on the trigger shaft between the air inlet hole and the injection hole. The present invention improves the concentration effect of the fire extinguishing powder when the ejection ends of the two powder storage covers face the same direction, thereby increasing the concentration of the fire extinguishing powder, improving the explosion-proof effect, and the position of the powder storage cover can be adjusted.

Description

Technical Field

[0001] The invention relates to the technical field of underground explosion-proofing in coal mines, and in particular to a two-way double-storage type 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-proof devices in China adopt the patent scheme with application number 2019101035195, which is named "Automatic two-way explosion-proof 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 the trigger, 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. However, the shock wave receiving rod of this scheme needs to pass through the powder storage cover, and the structure is relatively complicated. In addition, the two powder storage covers in the scheme have opposite powder spraying directions, which is not conducive to the concentration of the fire extinguishing powder. Summary of the invention

[0003] In view of the deficiencies of the prior art, the present invention provides a two-way double-storage type underground coal mine automatic explosion-proof device, which not only realizes the separation of the shock wave receiving rod and the powder storage cover, but also realizes the adjustable direction of the ejection ends of the two powder storage covers.

[0004] The present invention is realized by the following technical scheme, and provides a two-way double-storage type 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, the piston body is connected to the shock wave receiving rod; at least two trigger holes arranged opposite to each other are opened on the side wall of the piston cylinder, the two opposite trigger holes are respectively connected to the powder spraying assembly, and a boss opposite to the trigger hole is fixedly arranged on the piston body;

[0005] 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.

[0006] The trigger mechanism includes a trigger shaft slidably arranged in the ventilation pipe, and a sealing section is provided on the trigger shaft and is sealed and slidably 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.

[0007] When the explosion-proof device of the present scheme is installed, the piston body and the powder storage cover are both arranged along the length direction of the tunnel, the compressed gas is stored in the high-pressure air cavity, and the fire-extinguishing powder is stored in the powder storage cover. By arranging at least two powder storage covers, the storage capacity of the fire-extinguishing powder is increased, and the explosion-proof effect is improved; when no explosion occurs, the boss is located at a position opposite to the trigger hole, and the boss is used to limit the movement of the trigger shafts on both sides along the ventilation pipe, and the connection between the high-pressure air cavity and the powder storage cover is cut off by the sealing section of the trigger shaft; 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 the blocking effect on the trigger shaft, and provides space for the movement of the trigger shaft. The two trigger shafts move respectively under the action of the high-pressure gas in the two high-pressure air cavities, and the sealing section of the trigger shaft leaves between the air inlet and the jet hole, so that the high-pressure air cavity 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-proof.

[0008] As an optimization, the spraying direction of the powder storage cover in one of the powder spraying assemblies is the same as or opposite to the spraying direction of the powder storage cover in the other powder spraying assembly. The setting of this optimization scheme can select the spraying direction of the powder storage cover according to the on-site installation conditions. When the spraying directions of the two powder storage covers are consistent, it is beneficial to increase the concentration of the fire extinguishing powder after spraying. When the powder storage cover on one side interferes with the fixed objects at the installation site, the spraying directions of the two powder storage covers can be set to be opposite, thereby improving the convenience of installation.

[0009] As an optimization, a trigger ball 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 depth of the rolling 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 rolling groove is provided to provide an accommodation space for the trigger ball, thereby ensuring the reliable movement of the trigger shaft.

[0010] As an optimization, the boss is closed along the circumferential direction, the cross section of the boss is a trapezoid, 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 circumferential direction, 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.

[0011] 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.

[0012] 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.

[0013] As an optimization, each high-pressure gas chamber, vent pipe and piston cylinder are located in the same horizontal plane. This optimization scheme distributes each high-pressure gas chamber, vent pipe and piston cylinder along the width direction of the laneway, reducing the occupied space in the height direction and avoiding the impact on the mobile equipment in the laneway.

[0014] 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.

[0015] The beneficial effects of the present invention are as follows: before the explosion occurs, the trigger shaft is restricted by the boss on the piston body to maintain the high-pressure gas; after the explosion occurs, the restriction on the trigger shaft is released by the movement of the piston body, the communication between the high-pressure gas chamber and the powder storage cover is achieved, and the triggering action is flexible and reliable; when the spray ends of the two powder storage covers are facing the same direction, the concentration effect of the fire extinguishing powder is improved, thereby increasing the concentration of the fire extinguishing powder and improving the explosion-proof effect; when interference with one of the powder storage covers occurs on site, the position of the powder storage cover can be adjusted; by arranging the two trigger holes relative to each other, 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 the sensitivity of the explosion-proof device is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic top view of the structure of Embodiment 1 of the present invention;

[0017] Figure 2 for Figure 1 Middle partial enlarged picture;

[0018] Figure 3 It is a schematic top view of the structure of the second embodiment of the present invention;

[0019] As shown in the figure:

[0020] 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

[0021] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0022] Embodiment 1

[0023] like Figure 1 A two-way double-storage type underground automatic explosion-proof device for coal mines is shown, comprising a shock wave receiving rod 1, a piston cylinder 2 and a piston body 3 slidably arranged in the piston cylinder, wherein both ends of the piston body are respectively connected to the shock wave receiving rod by threads to realize explosion-proofing against explosions in two directions. A receiving plate and a hanging device are installed on the shock wave receiving rod 1, wherein 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.

[0024] Two trigger holes arranged radially opposite to each other are provided on the side wall of the piston cylinder. The two opposite trigger holes are respectively connected to powder spray assemblies. The two powder spray assemblies are respectively arranged on both sides of the piston cylinder along the width direction of the lane, and the two powder spray assemblies are symmetrical about the vertical plane passing through the axis of the piston cylinder.

[0025] The piston body includes a core shaft 10 and a boss 11 fixed on the core shaft. The boss 11 is opposite to the trigger hole. The boss of this embodiment 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. The inclined surface of the trapezoid is used to make the trigger ball 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 vent pipe. The outer diameter of the boss is larger than the core shaft diameter and is adapted to the inner diameter of the piston cylinder. The boss and the inner wall of the piston cylinder can slide relative to each other.

[0026] 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.

[0027] 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 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.

[0028] 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.

[0029] In this embodiment, the spraying end of the powder storage cover in one of the powder spraying assemblies is oriented in the same direction as the spraying end of the powder storage cover in the other powder spraying assembly, so as to increase the concentration of the fire extinguishing powder after spraying.

[0030] 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, and rolling grooves are provided on the piston body on both sides of the boss. The bottom of the rolling groove is the outer cylindrical surface of the core shaft, and the side wall of the rolling groove is the inclined surface of the boss. The depth of the rolling groove is greater than the diameter of the trigger ball.

[0031] 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, so that the trigger shaft and the trigger ball are better separated.

[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 spray end direction of the powder storage cover according to the installation site conditions.

[0033] The side wall of the piston cylinder is provided with a tightening bolt 9 which is radially pressed against the piston body, and the tightening bolt is threadedly connected to the side wall of the piston cylinder. During transportation, the piston body is tightened by the tightening bolt to achieve relative fixation between the piston cylinder and the piston body to avoid triggering the shaft movement. After the underground installation is completed, the tightening bolt can be removed.

[0034] 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 direction of the tunnel, and the high-pressure gas chamber and the powder storage cover are distributed on both sides of the piston cylinder along the width direction of the tunnel to save the occupied height space. When no explosion occurs, the boss is located at a position opposite to the two trigger holes, and the trigger ball is located in the inner cavity of the external thread section. Due to the setting of the boss, the trigger ball is prevented from moving, and the axial movement of the trigger shaft along the ventilation pipe is restricted. 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 along the axial direction of the piston cylinder, so that the boss moves to one side of the two trigger holes, and the two trigger balls pass through the two trigger holes respectively 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 restriction effect on the trigger shaft, and the trigger shaft moves under the action of the high-pressure gas in the high-pressure gas chamber, 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, so as to achieve explosion isolation.

[0035] Embodiment 2

[0036] The difference between this embodiment and the embodiment is that the spraying end of the powder storage cover in one of the powder spraying assemblies of this embodiment is oriented opposite to the spraying end of the powder storage cover in the other powder spraying assembly to accommodate interference with the powder storage cover at the tunnel installation site.

[0037] 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 two-way double-storage type 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 trigger holes are arranged opposite to each other on the side wall of the piston cylinder, the two trigger holes are respectively connected to the powder spraying assembly, and a boss (11) opposite to the trigger hole is fixedly provided on the piston body; 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; The direction of the spraying end of the powder storage cover in one of the powder spraying assemblies is the same as or opposite to the direction of the spraying end of the powder storage cover in the other powder spraying assembly.

2. The two-way double-storage underground coal mine automatic explosion-proof device according to claim 1 is characterized by: 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.

3. The two-way double-storage underground coal mine automatic explosion-proof device according to claim 1 is characterized by: 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.

4. The two-way double-storage underground coal mine automatic explosion-proof device according to claim 1 is characterized by: 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.

5. The two-way double-storage underground coal mine automatic explosion-proof device according to claim 1 is characterized by: Each high-pressure air chamber, the ventilation pipe and the piston cylinder are located in the same transverse plane.

6. The two-way double-storage underground coal mine automatic explosion-proof device according to claim 1 is characterized by: Both ends of the piston body are connected with shock wave receiving rods.

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