Coal seam gas direct injection prevention range limiting device

Abstract

The utility model relates to the field of coal mine safety production, in particular to a coal seam gas direct injection prevention range limiting device. The utility model provides a coal seam gas direct injection prevention range limiting device which can limit the range of gas and prevent safety accidents when the gas in a coal seam overflows due to overlarge pressure. A coal seam gas direct injection prevention range limiting device comprises a rear cylinder, a front cylinder, a supporting ring and a direct suction cylinder, the front side of the rear cylinder is connected with the front cylinder, the inner side of the front cylinder is connected with the supporting ring, and the inner side of the supporting ring is connected with the direct suction cylinder. According to the utility model, the buffer cover is stretched through the handle, so that the buffer cover shields the vicinity of a drill hole, and when gas in a coal seam overflows due to high pressure, the gas is blocked by the buffer cover to remain in the front cylinder and then is discharged and collected through the branch pipe, so that the range of the gas can be limited when the gas in the coal seam overflows due to high pressure; and safety accidents are prevented.

Description

Technical Field

[0001] The utility model relates to the field of safe production in coal mines, in particular to a device for limiting the range of coal seam gas direct injection prevention. Background Art

[0002] Coal seam gas direct injection, also known as gas blowout, refers to the direct ejection of a large amount of gas from coal rock cracks under pressure during coal seam drilling construction. The gas will carry a small amount of coal and gravel during the gas ejection process, which can easily cause injuries to drilling construction workers. Therefore, prevention of coal seam gas direct injection is an important safety issue that needs to be urgently resolved during coal seam mining.

[0003] The existing coal seam gas direct injection prevention is usually carried out by installing a gas extraction pipeline on the coal seam drill hole to extract the gas in the coal seam, thereby reducing the pressure of the coal seam and preventing the gas from erupting. However, since the gas pressure in the coal seam is relatively high, when the extraction pipeline is used for extraction, it is easy for the gas to overflow and leak from around the drill hole, thereby causing a safety accident, which is quite dangerous.

[0004] Therefore, a coal seam gas direct injection range limiting device is now developed, which can limit the range of gas when gas overflows due to excessive pressure in the coal seam to prevent safety accidents. Utility Model Content

[0005] In order to overcome the shortcomings of the existing coal seam gas direct injection prevention, in which the gas pressure of the coal seam is relatively high and the gas is easily leaked from around the borehole when it is extracted using an extraction pipeline, the utility model provides a coal seam gas direct injection prevention range limiting device which can limit the range of the gas when the gas overflows due to excessive pressure in the coal seam to prevent safety accidents.

[0006] Technical solution: A coal seam gas direct injection range limiting device includes a rear tube, a front tube, a support ring and a straight suction tube. The front side of the rear tube is connected to the front tube, the inner side of the front tube is connected to the support ring, the inner side of the support ring is connected to the straight suction tube, and the straight suction tube passes through the front tube and the rear tube.

[0007] In addition, it is particularly preferred that a blocking cone and a filter screen are further included, the blocking cone is connected to the front side of the straight suction cylinder, and a plurality of filter screens are clamped on the inner side of the straight suction cylinder.

[0008] In addition, it is particularly preferred that it also includes a valve body, a compression spring, a sealing ball, and a branch pipe. The valve body is connected to the upper and lower sides of the front of the straight suction cylinder, and sealing balls are slidably connected to the valve body. The sealing balls are connected to the adjacent valve bodies with compression springs, and branch pipes are connected to the upper and lower sides of the front cylinder.

[0009] In addition, it is particularly preferred that it also includes a buffer cover, a fixing frame, a telescopic rod and a handle, the buffer cover is connected to the front of the front tube, a plurality of fixing frames are connected to the outer side of the front of the front tube, the fixing frames are all slidably connected to the telescopic rods, the telescopic rods are all connected to the buffer cover, and the handles are rotatably connected to the left and right sides of the front of the buffer cover.

[0010] Furthermore, it is particularly preferred that the buffer cover has a multi-layer stepped structure.

[0011] In addition, it is particularly preferred that a staple is further included, and a plurality of staples are connected to the front portion of the front tube, and the staples all pass through the buffer cover.

[0012] Beneficial effect: The utility model stretches the buffer cover by the handle so that the buffer cover shields the vicinity of the drill hole. When the gas in the coal seam overflows due to high pressure, it is blocked by the buffer cover and remains in the front tube, and then discharged and collected through the branch pipe. This achieves the effect of limiting the range of gas when the gas in the coal seam overflows due to excessive pressure, thereby preventing safety accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0014] Figure 2 It is a partial three-dimensional structural cross-sectional schematic diagram of the utility model.

[0015] Figure 3 It is a schematic cross-sectional view of the three-dimensional structure of the overpressure assembly of the utility model.

[0016] Figure 4 It is a three-dimensional structural schematic diagram of the plugging component of the utility model.

[0017] Among them, the above-mentioned drawings include the following figure marks: 1. rear cylinder, 2. front cylinder, 3. support ring, 4. straight suction cylinder, 5. blocking cone, 6. filter screen, 7. valve body, 8. compression spring, 9. sealing ball, 10. branch pipe, 11. buffer cover, 12. fixing frame, 13. telescopic rod, 14. handle, 15. staple. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] A coal seam gas direct injection prevention range limiting device, such as Figure 1-Figure 4As shown, it includes a rear tube 1, a front tube 2, a support ring 3 and a straight suction tube 4, a blocking cone 5 and a filter screen 6, a valve body 7, a compression spring 8, a sealing ball 9, a branch pipe 10, a buffer cover 11, a fixing frame 12, a telescopic rod 13 and a handle 14 and a clamp 15. The front side of the rear tube 1 is connected to the front tube 2, the inner side of the front tube 2 is connected to the support ring 3, the inner side of the support ring 3 is connected to the straight suction tube 4, the straight suction tube 4 passes through the front tube 2 and the rear tube 1, the front side of the straight suction tube 4 is connected to the blocking cone 5, the inner side of the straight suction tube 4 is clamped with six filter screens 6, the upper and lower sides of the front of the straight suction tube 4 are connected to the valve body 7, and the valve body 7 is sliding. A sealing ball 9 is connected, and compression springs 8 are connected between the sealing balls 9 and the adjacent valve bodies 7. Branch pipes 10 are connected to the upper and lower sides of the front cylinder 2. A buffer cover 11 is connected to the front of the front cylinder 2. The buffer cover 11 is a multi-layer stepped structure that can buffer the gas impact. Two fixing frames 12 are connected to the outer side of the front of the front cylinder 2. Telescopic rods 13 are slidably connected to the fixing frames 12. The telescopic rods 13 are connected to the buffer cover 11. Handles 14 are rotatably connected to the left and right sides of the front of the buffer cover 11. Four staples 15 are also connected to the front of the front cylinder 2, and the staples 15 all pass through the buffer cover 11.

[0020] When using the utility model, firstly, a drilling device is used to drill a gas discharge hole in the coal seam, and then the rear tube 1 is moved to the vicinity of the borehole, and the front tube 2 is fixed to the vicinity of the borehole by means of a clamp 15, and the borehole is blocked by a plugging cone 5, so that the gas enters the straight suction tube 4 after passing through the plugging cone 5, and after the coal and gravel in the gas are filtered out by the filter screen 6, it is discharged and collected from the straight suction tube 4. When the gas pressure is too high, the sealing ball 9 is squeezed to slide upward in the valve body 7, so that the valve body 7 is opened, so that the gas enters the front tube 2 from the straight suction tube 4, and then enters the branch pipe 10 is used for discharge and collection, thereby relieving the pressure in the straight suction cylinder 4. When the front cylinder 2 is fixed, the buffer cover 11 is stretched by the handle 14 to make the telescopic rod 13 slide on the fixing frame 12, so that the buffer cover 11 shields the vicinity of the borehole. When the gas in the coal seam overflows due to high pressure, it is blocked by the buffer cover 11 and remains in the front cylinder 2, and then discharged and collected through the branch pipe 10, thereby playing a role in limiting the range of gas and preventing safety accidents when the gas in the coal seam overflows due to excessive pressure.

[0021] It should be understood that this embodiment is only used to illustrate the present invention and is not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

Claims

1. A coal bed gas direct injection prevention range limiting device, characterized in that: It comprises a rear tube (1), a front tube (2), a support ring (3) and a straight suction tube (4); the front side of the rear tube (1) is connected to the front tube (2); the inner side of the front tube (2) is connected to the support ring (3); the inner side of the support ring (3) is connected to the straight suction tube (4); the straight suction tube (4) passes through the front tube (2) and the rear tube (1); It also includes a valve body (7), a compression spring (8), a sealing ball (9), and a branch pipe (10). The upper and lower sides of the front of the straight suction cylinder (4) are connected to the valve body (7). The sealing ball (9) is slidably connected inside the valve body (7). The sealing ball (9) is connected to the adjacent valve body (7) with a compression spring (8). The upper and lower sides of the front cylinder (2) are connected to the branch pipe (10). The invention also comprises a buffer cover (11), a fixing frame (12), a telescopic rod (13) and a handle (14); the front part of the front tube (2) is connected to the buffer cover (11); the front outer side of the front tube (2) is connected to a plurality of fixing frames (12); the fixing frames (12) are all slidably connected to the telescopic rods (13); the telescopic rods (13) are all connected to the buffer cover (11); and the handles (14) are rotatably connected to the left and right sides of the front part of the buffer cover (11).

2. A coal bed gas direct injection prevention range limiting device as claimed in claim 1, characterized in that: It also comprises a blocking cone (5) and a filter screen (6); the blocking cone (5) is connected to the front side of the straight suction cylinder (4), and a plurality of filter screens (6) are clamped on the inner side of the straight suction cylinder (4).

3. A coal bed gas direct injection prevention range limiting device as claimed in claim 1, characterized in that: The buffer cover (11) is a multi-layer stepped structure.

4. A coal bed gas direct injection prevention range limiting device as claimed in claim 1, characterized in that: It also includes a clamping nail (15), and the front part of the front tube (2) is also connected to a plurality of clamping nails (15), and the clamping nails (15) all pass through the buffer cover (11).

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