Emergency gas blowout preventer for mine drilling

Abstract

The invention relates to the field of gas extraction, in particular to a gas emergency blowout preventer for mine drilling, which comprises a blowout prevention cover, a collection cavity is arranged in the blowout prevention cover, a cover opening is arranged at the front end of the blowout prevention cover, a transverse through groove is arranged at the bottom of the blowout prevention cover, and one end of the transverse through groove extends to the front end of the blowout prevention cover. The other end of the transverse through groove extends to the rear end of the blowout prevention cover, and the transverse through groove communicates with the collecting cavity. A vertical groove is formed in the rear end of the blowout prevention cover and communicates with the collection cavity, the bottom end of the vertical groove extends to the bottom of the blowout prevention cover, the bottom end of the vertical groove communicates with the end of the transverse through groove, and the vertical groove and the transverse through groove are connected to form an L shape; the blowout prevention cover is provided with a sealing structure used for sealing the vertical groove and the transverse through groove. And an extraction opening is formed in the blowout prevention cover and is communicated with the collection chamber. By means of the scheme, the blowout prevention device can be conveniently and timely arranged at the position of a drill hole in the emergency situation of gas ejection, gas emission is reduced, and gas collection is achieved.

Description

Technical Field

[0001] The present invention relates to the field of gas drainage, and particularly to a gas emergency anti-blowout device for mine boreholes. Background Art

[0002] When drilling operations are carried out in a mine, sometimes the situation of gas gushing out in the mine will be encountered.

[0003] Currently, the emergency method after gas gushing is as follows: use a drainage pipe, place the nozzle of the drainage pipe at the drilling hole, and collect the gas.

[0004] However, when the gas gushes out urgently and in a large quantity, when the drainage pipe is placed at the drilling hole for drainage, a large amount of gas emerging from the drilling hole cannot be sucked away by the drainage pipe in time, and a large amount of gas diffuses outward, resulting in waste of gas. At the same time, a large amount of gas diffuses into the environment, which is extremely likely to cause safety accidents.

[0005] If an anti-blowout device is directly installed on the drill pipe in advance and the anti-blowout device covers the drilling hole, but directly fixing and installing the anti-blowout device on the drill pipe takes up a lot of space and brings great inconvenience to the use of the drill pipe. Summary of the Invention

[0006] The present invention aims to provide a gas emergency anti-blowout device for mine boreholes, so that in case of an emergency of gas gushing out, the anti-blowout device can be timely placed at the drilling hole, reduce the external discharge of gas, and achieve the collection of gas.

[0007] To achieve the above object, the present invention adopts the following technical solution: a gas emergency anti-blowout device for mine boreholes, including an anti-blowout cover. A collection chamber is provided inside the anti-blowout cover. A cover opening is provided at the front end of the anti-blowout cover. A transverse through groove is provided at the bottom of the anti-blowout cover. One end of the transverse through groove extends to the front end of the anti-blowout cover, and the other end of the transverse through groove extends to the rear end of the anti-blowout cover. The transverse through groove communicates with the collection chamber. A vertical groove is provided at the rear end of the anti-blowout cover. The vertical groove communicates with the collection chamber. The bottom end of the vertical groove extends to the bottom of the anti-blowout cover. The bottom end of the vertical groove communicates with the end of the transverse through groove. The vertical groove and the transverse through groove are connected into an L shape. A closing structure is provided on the anti-blowout cover for closing the vertical groove and the transverse through groove. An air extraction port is provided on the anti-blowout cover, and the air extraction port communicates with the collection chamber.

[0008] The principle and advantages of the solution of this application are as follows: During the process of drilling a hole in a coal mine with a drill pipe, if a sudden gas outburst occurs, the opening of this anti-blowout cover is oriented towards the coal mine, and the transverse groove is aligned with the drill pipe. The length direction of the transverse groove is the same as the length direction of the drill pipe. Then, the anti-blowout cover is pushed towards the drill pipe so that the drill pipe enters the transverse groove. Continuing to push the anti-blowout cover, since the transverse groove is connected to the vertical groove, the drill pipe enters the vertical groove and passes through the vertical groove. Finally, the anti-blowout cover is pushed towards the front end of the drill pipe so that the opening of the anti-blowout cover is in contact with the coal mine, and the anti-blowout cover covers the drilling area. In this way, the gas ejected from the drilling area enters the collection chamber of the anti-blowout cover, thus preventing the direct spraying and diffusion of gas. After the gas ejected from the drilling enters the anti-blowout cover, the gas in the anti-blowout cover is pumped and collected through the air extraction port.

[0009] The sealing structure in this application is used to seal the vertical groove and the transverse groove. In this way, when the anti-blowout cover covers the drilling area, the vertical groove and the transverse groove are sealed, preventing a large amount of the gas collected inside the anti-blowout cover from leaking out through the vertical groove and the transverse groove. The sealing structure plays a role in reducing the leakage of gas in the vertical groove and the transverse groove.

[0010] The gas emergency anti-blowout device for mine drilling in this application is convenient to use. It is not necessary to install the anti-blowout cover on the drill pipe in advance, and it will not affect the drilling work of the drill pipe. When an emergency of a large amount of gas ejection is detected, the anti-blowout cover can be quickly installed on the drill pipe and the anti-blowout cover can cover the drilling area, reducing the diffusion of gas and realizing the collection of gas. The anti-blowout cover is convenient and fast to install at the drilling area. The setting of the vertical groove and the transverse groove enables the drill pipe not to hinder the anti-blowout cover from covering the drilling area.

[0011] Preferably, as an improvement, the sealing structure includes a transverse rubber sheet for covering the transverse groove and a vertical rubber sheet for covering the vertical groove.

[0012] Thus, usually, the transverse rubber sheet covers the transverse groove, thereby realizing the sealing of the transverse groove, and the vertical rubber sheet covers the vertical groove, thereby realizing the sealing of the vertical groove. When the drill pipe enters the vertical groove, the vertical rubber sheet closely adheres to the drill pipe, thereby sealing the gap between the drill pipe and the vertical groove, ensuring the sealing effect of the vertical groove and reducing gas leakage.

[0013] Preferably, as an improvement, one side edge of the transverse rubber sheet and one side edge of the vertical rubber sheet are both fixed to the anti-blowout cover by bolts.

[0014] Thus, one side edge of the horizontal rubber sheet is fixed to the blowout preventer by bolts, and the other side edge is not fixed to the blowout preventer. In this way, the horizontal rubber sheet is convenient to open. When the blowout preventer is pushed towards the drill pipe, the drill pipe can push the horizontal rubber sheet to automatically open, so that it is convenient for the drill pipe to enter the horizontal through groove. Similarly, one side edge of the vertical rubber sheet is fixed to the blowout preventer by bolts, and the other side edge is not fixed to the blowout preventer. In this way, the vertical rubber sheet is convenient to open. During the movement of the drill pipe in the vertical groove of the blowout preventer, the vertical rubber sheet can automatically deform and open, so that it is convenient for the drill pipe to move in the vertical groove. Therefore, through the closed structure (horizontal rubber sheet and vertical rubber sheet) of this solution, there is no need to control the closed structure separately. The closed structure can be automatically opened when pushed by the drill pipe, and can automatically close when not pushed by the drill pipe, and the operation is simple and convenient.

[0015] Preferably, as an improvement, the number of the horizontal rubber sheets is two, and the parts where the two horizontal rubber sheets are fixed to the blowout preventer are respectively located on both sides of the horizontal through groove. Thus, with two horizontal rubber sheets, the closing effect of the horizontal rubber sheets on the horizontal through groove is better.

[0016] Preferably, as an improvement, the number of the vertical rubber sheets is two, and the parts where the two vertical rubber sheets are fixed to the blowout preventer are respectively located on both sides of the vertical groove. Thus, with two vertical rubber sheets, the closing effect of the vertical rubber sheets on the vertical groove is better.

[0017] Preferably, as an improvement, the side wall of the vertical groove is provided with a vertical receiving cavity, and the side wall of the horizontal through groove is provided with a horizontal receiving cavity; the closed structure includes a horizontal closing plate and a vertical closing plate. One end of the horizontal closing plate is horizontally slidably connected in the horizontal receiving cavity, and one end of the vertical closing plate is horizontally slidably connected in the vertical receiving cavity; the opening and closing of the horizontal through groove are realized by the sliding of the horizontal closing plate; the opening and closing of the vertical groove are realized by the sliding of the vertical closing plate.

[0018] Accordingly, the present application also discloses a closed structure of another structure. The closed structure no longer adopts the form of a horizontal rubber sheet and a vertical rubber sheet, but adopts the form of a horizontal closing plate and a vertical closing plate. One end of the horizontal closing plate in the present application is horizontally slidably connected in the horizontal receiving cavity. By sliding the horizontal closing plate into the horizontal receiving cavity, the opening of the horizontal through groove is realized, and the drill pipe enters the horizontal through groove. The horizontal closing plate is located in the horizontal receiving cavity, and the horizontal closing plate will not obstruct the drill pipe, and the drill pipe enters the horizontal through groove more smoothly. By sliding the horizontal closing plate out of the horizontal receiving cavity, the closing of the horizontal through groove is realized. One end of the vertical closing plate in the present application is horizontally slidably connected in the vertical receiving cavity. By sliding the vertical closing plate into the vertical receiving cavity, the opening of the vertical groove is realized, and there is no obstruction for the drill pipe to enter and move in the vertical groove. The drill pipe moves more smoothly in the vertical groove. By sliding the vertical closing plate out of the vertical receiving cavity, the closing of the vertical groove is realized.

[0019] Preferably, as an improvement, the horizontal closing plate and the vertical closing plate are connected into an L-shaped plate. Accordingly, the vertical closing plate and the horizontal closing plate are integrated, realizing the synchronous control of the vertical closing plate and the horizontal closing plate. The horizontal closing plate and the vertical closing plate do not need to be controlled separately, and the operation is simpler and more convenient.

[0020] Preferably, as an improvement, a compression spring for applying pressure to the L-shaped plate is provided in the horizontal receiving cavity or the vertical receiving cavity. Accordingly, the compression spring has pressure on the L-shaped plate, thereby ensuring the closing effect of the L-shaped plate on the horizontal through groove and the vertical groove.

[0021] Preferably, as an improvement, a horizontal pull rod is fixedly connected to the L-shaped plate. The pull rod is horizontally slidably connected to the blowout preventer, and the end of the pull rod away from the L-shaped plate is located outside the blowout preventer. Accordingly, by pulling the pull rod, the pull rod drives the L-shaped plate to move. The L-shaped plate squeezes the compression spring against the pressure of the compression spring, and the L-shaped plate enters the horizontal receiving cavity and the vertical receiving cavity, and the horizontal through groove and the vertical groove are opened; when the pull rod is released, the L-shaped plate automatically comes out of the horizontal receiving cavity and the vertical receiving cavity under the pressure of the compression spring to close the horizontal through groove and the vertical groove.

[0022] Preferably, as an improvement, a handle is fixedly provided on the outer wall of the blowout preventer cover. A holding rod is slidably provided on the handle, and the holding rod is fixedly connected to the pull rod. Thus, the handle is convenient for holding the blowout preventer cover. When holding the blowout preventer cover, when it is necessary to open the horizontal through groove and the vertical groove, the fingers hold the holding rod, the holding rod drives the pull rod to move, the pull rod drives the L-shaped plate to move, and the L-shaped plate squeezes the compression spring against the pressure of the compression spring. The L-shaped plate enters the horizontal receiving cavity and the vertical receiving cavity, the horizontal through groove and the vertical groove are opened, and the drill pipe enters the horizontal through groove and the vertical groove. After the drill pipe enters the vertical groove, the handle is released. At this time, the holding rod is no longer held by the hand, and the L-shaped plate automatically comes out of the horizontal receiving cavity and the vertical receiving cavity under the pressure of the compression spring to close the horizontal through groove and the vertical groove. Thus, through the solution of the present application, during the process of installing the blowout preventer cover and holding the handle, the horizontal through groove and the vertical groove can be automatically opened without additional operation, and the operation is simple and convenient. After the blowout preventer cover is installed, the handle is released, and the horizontal through groove and the vertical groove are automatically closed without additional operation, and the operation is simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 FIG. is a perspective view of a gas emergency blowout preventer device for mine drilling in Embodiment 1, where the drill pipe is located in the vertical groove.

[0024] Figure 2 FIG. is a perspective view of a gas emergency blowout preventer device for mine drilling in Embodiment 1, where the drill pipe has not yet entered the vertical groove.

[0025] Figure 3 FIG. is a perspective view of a gas emergency blowout preventer device for mine drilling in Embodiment 1, showing the internal structure of the blowout preventer cover.

[0026] Figure 4 FIG. is a perspective view of a gas emergency blowout preventer device for mine drilling in Embodiment 1, showing the internal structure of the blowout preventer cover without the vertical rubber sheet and the horizontal rubber sheet installed.

[0027] Figure 5 FIG. is a perspective view of a gas emergency blowout preventer device for mine drilling in Embodiment 1, showing the rear-end structure of the blowout preventer cover without the vertical rubber sheet and the horizontal rubber sheet installed.

[0028] Figure 6 FIG. is a perspective view of a gas emergency blowout preventer device for mine drilling in Embodiment 2.

[0029] Figure 7 FIG. is a perspective view of a gas emergency blowout preventer device for mine drilling in Embodiment 2 (without the L-shaped plate installed).

[0030] Figure 8 FIG. is a vertical sectional view of the rear end of the blowout preventer cover.

[0031] Figure 9 It is a schematic structural diagram of an L-shaped plate. Specific implementation manners

[0032] The following is a further detailed description through specific implementation manners: The reference numerals in the accompanying drawings of the specification include: blowout preventer 1, air extraction port 2, drill pipe 3, front end of the drill pipe 4, vertical groove 5, transverse rubber sheet 6, vertical rubber sheet 7, transverse through groove 8, bolt 9, collection chamber 10, L-shaped plate 11, through hole 12, handle 13, pull rod 14, holding rod 15, strip hole 16, vertical accommodation cavity 17, transverse accommodation cavity 18, compression spring 19.

[0033] Embodiment 1 Basically as shown in the appendix Figures 1 - 5 Shown: This embodiment discloses a gas emergency blowout preventer for mine drilling, including a blowout preventer 1. The blowout preventer 1 is in the shape of a cuboid and is welded by a top plate, a bottom plate, two left and right side plates and a rear end plate. A collection chamber 10 is provided inside the blowout preventer 1. A cover opening is provided at the front end of the blowout preventer 1, and the cover opening is communicated with the collection chamber 10. A transverse through groove 8 is provided at the bottom of the blowout preventer 1. One end of the transverse through groove 8 extends to the front end of the blowout preventer 1, and the other end of the transverse through groove 8 extends to the rear end of the blowout preventer 1. The transverse through groove 8 is communicated with the collection chamber 10. A vertical groove 5 is provided at the rear end of the blowout preventer 1. The vertical groove 5 is communicated with the collection chamber 10. The bottom end of the vertical groove 5 extends to the bottom of the blowout preventer 1, and the bottom end of the vertical groove 5 is communicated with the end of the transverse through groove 8. The vertical groove 5 and the transverse through groove 8 are connected into an L shape. An air extraction port 2 is welded on the top of the blowout preventer 1, and the air extraction port 2 is communicated with the collection chamber 10. The air extraction port 2 can be connected to an external air extraction pipe.

[0034] In this embodiment, a closing structure for closing the vertical groove 5 and the transverse through groove 8 is provided on the blowout preventer 1. The closing structure of this embodiment specifically adopts the following structure: The closing structure includes a transverse rubber sheet 6 for covering the transverse through groove 8 and a vertical rubber sheet 7 for covering the vertical groove 5. The number of the transverse rubber sheet 6 and the vertical rubber sheet 7 is two each. Combined Figure 3As shown, the two transverse rubber sheets 6 are respectively located at the inner and outer sides of the bottom of the spray shield 1, wherein the left side of the transverse rubber sheet 6 located inside the spray shield 1 is fixed to one side of the left edge of the transverse through slot 8 by bolts, and the right side of the other transverse rubber sheet 6 is fixed to one side of the right edge of the transverse through slot 8 by bolts, and the ends of the two transverse rubber sheets 6 away from the bolts are in a free and unfixed state. Of course, in other embodiments, the two transverse rubber sheets 6 can also be located inside the spray shield 1 or outside the spray shield 1 at the same time. Similar to the arrangement of the horizontal rubber sheet 6, the number of the vertical rubber sheets 7 in this embodiment is two, and both vertical rubber sheets 7 are located inside the spray shield 1. The left side of one vertical rubber sheet 7 is fixed to one side of the left edge of the vertical groove 5 by a bolt 9, and the right side of the other vertical rubber sheet 7 is fixed to one side of the right edge of the vertical groove 5 by a bolt 9. The ends of the two vertical rubber sheets 7 away from the bolt 9 are both free and unfixed, and the two vertical rubber sheets 7 are overlapped together. Of course, in other embodiments, the two vertical rubber sheets 7 can also be located on the outside of the spray shield 1 at the same time, or the two vertical rubber sheets 7 are located on the inner and outer sides of the spray shield 1 respectively.

[0035] The specific implementation process is as follows: When the drill rod 3 is drilling a hole in a coal mine, if gas suddenly blows out, the cover opening of the blowout prevention cover 1 is directed toward the coal mine (i.e., Figure 1 As shown, the cover opening of the blowout prevention cover 1 faces the front end 4 of the drill rod for drilling in the coal mine). Figure 2 As shown, in Figure 2 In this state, the blowout shield 1 is placed above the drill rod 3, the transverse through slot 8 at the bottom of the blowout shield 1 is opposite to the drill rod 3, and the length direction of the transverse through slot 8 is in the same direction as the length direction of the drill rod 3, and then Figure 2 The spray shield 1 is pushed in the direction of the arrow to make it approach the drill rod 3. The drill rod 3 pushes the transverse rubber sheet 6, causing the transverse rubber sheet 6 to deform and automatically give way (of course, the transverse rubber sheet 6 can also be manually pushed away). The drill rod 3 enters the transverse through groove 8 and continues to push the spray shield 1. Since the transverse through groove 8 is connected to the vertical groove 5, the drill rod 3 enters the vertical groove 5. The drill rod 3 passes through the vertical groove 5. During the process of the drill rod 3 entering the vertical groove 5, the drill rod 3 causes the vertical rubber sheet 7 to deform and give way. The drill rod 3 slides between the two vertical rubber sheets 7. Finally, the drill rod 3 enters the vertical groove 5. Figure 1 Finally, the blowout shield 1 is pushed toward the front end 4 of the drill rod, so that the cover opening of the blowout shield 1 is in contact with the coal mine, and the blowout shield 1 covers the drill hole. At the same time, the horizontal rubber sheet 6 covers the horizontal through groove 8, and the vertical rubber sheet 7 covers the vertical groove 5.

[0036] In this way, the gas ejected from the borehole enters the collection chamber 10 of the blowout preventer 1, thereby preventing the direct spraying and diffusion of the gas. After the gas ejected from the borehole enters the blowout preventer 1, the gas in the blowout preventer 1 is pumped and collected through the air extraction port 2.

[0037] In this embodiment, when the blowout preventer 1 covers the borehole, the vertical groove 5 and the horizontal through groove 8 are covered and sealed by corresponding rubber sheets, preventing a large amount of the gas collected in the blowout preventer 1 from leaking out through the vertical groove 5 and the horizontal through groove 8. The sealing structure plays a role in reducing the leakage of gas in the vertical groove 5 and the horizontal through groove 8.

[0038] When the gas spraying is completed, directly lift the blowout preventer 1 upward in Figure 2 The drill pipe 3 moves downward relative to the vertical groove 5, and the drill pipe 3 passes through the horizontal through groove 8, and the blowout preventer 1 is separated from the drill pipe 3.

[0039] Embodiment 2 This embodiment discloses a sealing structure different from that of Embodiment 1.

[0040] Combined with Figures 6 - 9 As shown, in this embodiment, vertical accommodation cavities 17 are provided on both side walls of the vertical groove 5, and the two vertical accommodation cavities 17 face each other. Horizontal accommodation cavities 18 are provided on both side walls of the horizontal through groove 8, and the two horizontal accommodation cavities 18 face each other. The sealing structure includes a horizontal sealing plate and a vertical sealing plate. The number of the horizontal sealing plates is two, and the two horizontal sealing plates are arranged oppositely. The end parts of the two horizontal sealing plates away from each other are respectively connected to the horizontal accommodation cavity 18 in a horizontal sliding manner. The number of the vertical sealing plates is two, and the two vertical sealing plates are arranged oppositely. One end of the two vertical sealing plates away from each other is connected to the vertical accommodation cavity 17 in a horizontal sliding manner. In this embodiment, the horizontal sealing plate and the vertical sealing plate are integrally connected, and an L-shaped plate 11 is formed after the vertical sealing plate and the horizontal sealing plate are connected. Since both the vertical sealing plate and the horizontal sealing plate are two, the number of the L-shaped plates 11 is also two, and the two L-shaped plates 11 face each other. In this embodiment, when the end parts of the two L-shaped plates 11 are in contact with each other, the vertical groove 5 and the horizontal through groove 8 are in a closed state, and when the two L-shaped plates 11 are separated, the vertical groove 5 and the horizontal through groove 8 are in an open state. In order to improve the sealing performance when the L-shaped plates 11 are in contact, in some embodiments, rubber sealing sheets are fixed (such as by bonding or fixing with screws) at the opposite end parts of the two L-shaped plates 11.

[0041] Combined with Figure 8 As shown, in this embodiment, a compression spring 19 for applying pressure to the L-shaped plate 11 is provided in the horizontal accommodation cavity 18 or the vertical accommodation cavity 17. Figure 8The compression spring 19 therein is located in the vertical accommodation cavity 17. The number of compression springs 19 is two groups, and each group acts on an L-shaped plate 11 respectively. One end of the compression spring 19 is connected (such as welded) to the end of the L-shaped plate 11, and the other end of the compression spring 19 is connected to the inner wall of the vertical accommodation cavity 17. A transverse pull rod 14 is fixedly connected (such as welded) to each L-shaped plate 11. There are rod holes provided on the side wall of the blowout preventer 1, and the pull rod 14 passes through the rod holes transversely and is slidably connected to the blowout preventer 1. The end of the pull rod 14 away from the L-shaped plate 11 is located outside the blowout preventer 1. In order to improve the stability of the compression spring 19 acting on the L-shaped plate 11, the compression spring 19 in this embodiment is sleeved on the pull rod 14. Of course, in other embodiments, the compression spring 19 may not be sleeved on the pull rod 14, and the number of compression springs 19 can be set to multiple according to actual situations. Figure 8 It is shown in Figure 8 that the number of pull rods 14 connected to each L-shaped plate 11 is one. Of course, in other embodiments, the number of pull rods 14 connected to each L-shaped plate 11 can also be multiple. The multiple pull rods 14 are respectively connected to different parts of the L-shaped plate 11. At this time, the compression springs 19 are provided in multiple numbers following the pull rods 14.

[0042] Combined with Figure 6 As shown, on the two outer walls of the blowout preventer 1 in this embodiment, handles 13 are fixedly provided (such as welded or fixed by screws). A holding rod 15 is slidably provided transversely on the handle 13. The specific sliding method is as follows: there is a strip-shaped hole 16 on the handle 13, and the holding rod 15 passes through the strip-shaped hole 16 transversely. The length direction of the holding rod 15 is the same as the length direction of the handle 13. The end of the holding rod 15 is fixedly connected (such as welded or fixed by screws, etc.) to the end of the pull rod 14. In the case where there are multiple pull rods 14, the multiple pull rods 14 can pass through the side wall of the blowout preventer 1 and then be connected into one body by a connecting rod, and after being connected into one body, they are fixedly connected to the holding rod 15.

[0043] It is easy to understand that in order to facilitate the installation of the L-shaped plate 11 in the vertical accommodation cavity 17 and the horizontal accommodation cavity 18, the outer side wall of the rear end of the blowout preventer 1 and the inner side wall of the rear end of the blowout preventer 1 in this embodiment are detachably connected. The specific detachable connection method can be fixed by bolts, screws, etc., or before the assembly of the blowout preventer 1, the outer side wall of the rear end of the blowout preventer 1 and the inner side wall of the rear end of the blowout preventer 1 are not connected into one body. During assembly, structures such as the L-shaped plate 11, the compression spring 19, and the pull rod 14 are placed between the outer side wall of the rear end of the blowout preventer 1 and the inner side wall of the rear end of the blowout preventer 1, and after the outer side wall of the rear end of the blowout preventer 1 and the inner side wall of the rear end of the blowout preventer 1 are covered together, they can be fixed by welding. Thus, the assembly of structures such as the blowout preventer 1, the L-shaped plate 11, the compression spring 19, and the pull rod 14 is realized.

[0044] An arc-shaped groove is provided on the vertical closing plate in this embodiment. The two vertical closing plates are joined together to form a through hole 12 for the drill pipe 3 to pass through.

[0045] Through the blowout prevention device of this embodiment, when an emergency of gas ejection occurs, hold the handle 13 with both hands, hold the holding rod 15 with fingers, the holding rod 15 moves away from the blowout prevention cover 1, the holding rod 15 drives the pull rod 14 to move, the pull rod 14 drives the L-shaped plate 11 to move, and the L-shaped plate 11 squeezes the compression spring 19 against the pressure of the compression spring 19. The two L-shaped plates 11 move away from each other, and the two L-shaped plates 11 both enter the horizontal accommodation cavity 18 and the vertical accommodation cavity 17, the horizontal through groove 8 and the vertical groove 5 are opened, and the drill pipe 3 enters the horizontal through groove 8 and the vertical groove 5. Since the horizontal through groove 8 and the vertical groove 5 are in a fully open state, the drill pipe 3 enters the vertical groove 5 and the horizontal through groove 8 very smoothly. When the drill pipe 3 enters the vertical groove 5 and specifically moves to the arc groove of the vertical closing plate, release the handle 13. At this time, the holding rod 15 is no longer held by the hand, and the L-shaped plate 11 automatically exits from the horizontal accommodation cavity 18 and the vertical accommodation cavity 17 under the pressure of the compression spring 19. The two L-shaped plates 11 are joined together, and the two L-shaped plates 11 close the horizontal through groove 8 and the vertical groove 5, and the drill pipe 3 is stuck in the through hole 12 formed by the joining of the two L-shaped plates 11.

[0046] Thus, during the process of installing the blowout prevention cover 1 and holding the handle 13, the horizontal through groove 8 and the vertical groove 5 can be automatically opened without additional operation, and the operation is simple and convenient. After the blowout prevention cover 1 is installed, release the handle 13, and the horizontal through groove 8 and the vertical groove 5 are automatically closed without additional operation, and the operation is simple and convenient. The setting of the arc groove enables the two vertical closing plates to avoid the drill pipe 3 when they are joined together, and the drill pipe 3 will not hinder the two vertical closing plates from being joined together, ensuring the sealing property after the L-shaped plates 11 are joined.

[0047] The above are only embodiments of the present invention. Specific technical solutions and / or common knowledge such as characteristics well known in the art are not described in detail herein. It should be noted that for those skilled in the art, without departing from the technical solution of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicability of the patent. The protection scope required by this application should be based on the content of its claims, and the specific implementation manners described in the specification can be used to interpret the content of the claims.

Claims

1. A gas emergency blowout prevention device for mine drilling, characterized in that: The invention comprises a spray shield, wherein a collecting chamber is arranged inside the spray shield, a shield opening is arranged at the front end of the spray shield, a transverse through groove is arranged at the bottom of the spray shield, one end of the transverse through groove extends to the front end of the spray shield, the other end of the transverse through groove extends to the rear end of the spray shield, and the transverse through groove is communicated with the collecting chamber; a vertical groove is arranged at the rear end of the spray shield, the vertical groove is communicated with the collecting chamber, the bottom end of the vertical groove extends to the bottom of the spray shield, the bottom end of the vertical groove is communicated with the end of the transverse through groove, and the vertical groove and the transverse through groove are connected to form an L shape; a closing structure for closing the vertical groove and the transverse through groove is arranged on the spray shield; an air suction port is arranged on the spray shield, and the air suction port is communicated with the collecting chamber.

2. The gas emergency blowout prevention device for mine drilling according to claim 1 is characterized in that: The closing structure comprises a transverse rubber sheet for covering the transverse through slot and a vertical rubber sheet for covering the vertical slot.

3. The gas emergency blowout prevention device for mine drilling according to claim 2 is characterized in that: One side edge of the transverse rubber sheet and one side edge of the vertical rubber sheet are both fixed on the spray shield by bolts.

4. A gas emergency blowout prevention device for mine drilling according to claim 3, characterized in that: The number of the transverse rubber sheets is two, and the two transverse rubber sheets are fixed to the spray shield at two sides of the transverse through groove.

5. The gas emergency blowout prevention device for mine drilling according to claim 2 is characterized in that: The number of the vertical rubber sheets is two, and the two vertical rubber sheets are fixed to the spray shield at two sides of the vertical groove respectively.

6. The gas emergency blowout prevention device for mine drilling according to claim 1 is characterized in that: The side wall of the vertical groove is provided with a vertical accommodating cavity, and the side wall of the transverse through groove is provided with a transverse accommodating cavity; the closed structure includes a transverse closing plate and a vertical closing plate, one end of the transverse closing plate is transversely slidably connected in the transverse accommodating cavity, and one end of the vertical closing plate is transversely slidably connected in the vertical accommodating cavity; the opening and closing of the transverse through groove is achieved by sliding the transverse closing plate; the opening and closing of the vertical groove is achieved by sliding the vertical closing plate.

7. A gas emergency blowout prevention device for mine drilling according to claim 6, characterized in that: The transverse closing plate and the vertical closing plate are connected to form an L-shaped plate.

8. The gas emergency blowout prevention device for mine drilling according to claim 7 is characterized in that: A compression spring for applying pressure to the L-shaped plate is arranged in the transverse accommodating cavity or the vertical accommodating cavity.

9. A gas emergency blowout prevention device for mine drilling according to claim 8, characterized in that: A transverse pull rod is fixedly connected to the L-shaped plate, and the pull rod is transversely slidably connected to the spray shield, and one end of the pull rod away from the L-shaped plate is located outside the spray shield.

10. A gas emergency blowout prevention device for mine drilling according to claim 9, characterized in that: A handle is fixedly provided on the outer wall of the spray shield, a holding rod is slidably provided on the handle, and the holding rod is fixedly connected to the pull rod.

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