Pre-pumping drilling gas-phase fracturing device before excavation of low-permeability coal seam

Abstract

The utility model belongs to the technical field of gas control, and particularly relates to a pre-drainage drilling gas-phase fracturing device before excavation of a low-permeability coal seam, which comprises a main pipeline, a fixing frame is fixedly mounted on the outer side of the main pipeline, connecting pipes are fixedly mounted on the outer side of the main pipeline and are sequentially arranged from left to right, and sealing frames are fixedly mounted on the outer sides of the connecting pipes; through the arranged cleaning assembly, in the long-term use process of the main pipeline, a motor can be controlled to drive a driving shaft to rotate, so that the driving shaft can drive a rotating shaft to rotate through a bevel gear after rotating, and the rotating shaft can drive a rotating frame to rotate through a transmission gear after rotating; and after the rotating frame rotates, the inner wall of the main pipeline can be cleaned through the cleaning plate, gas is not prone to adhering to the upper portion of the inner wall of the main pipeline in the extraction process, and the main pipeline is not prone to being blocked.

Description

Technical Field

[0001] This utility model relates to the field of gas control technology, and in particular to a gas phase fracturing device for pre-drainage boreholes in low-permeability coal seams. Background Technology

[0002] Currently, most of the coal seams mined in China are high-gas coal seams, which are difficult to extract. The safety hazards of coal and gas outbursts during roadway excavation seriously restrict the safe and efficient production of mines.

[0003] CN 207080213 U discloses a gas-phase fracturing device for pre-drainage drilling in low-permeability coal seams, including a gas-phase fracturing assembly, a sealing device, a top rod assembly, and sleepers. The gas-phase fracturing tube includes an air-filled end, a release end with evenly distributed release holes, and an extension rod. The release end of the N+1th gas-phase fracturing tube is connected to the extension rod of the Nth gas-phase fracturing tube. Two water injection nozzles are provided at one end of the sealing device.

[0004] During long-term extraction, the ore body brought by the gas tends to accumulate on the inner wall of the main pipeline, which can easily cause blockages. This requires frequent unblocking by the staff, and the connection of multiple branch pipelines is also inconvenient. Therefore, we propose a gas phase fracturing device for pre-extraction drilling of low-permeability coal seams. Utility Model Content

[0005] The purpose of this invention is to provide a pre-drainage borehole gas phase fracturing device for low-permeability coal seams, which solves the existing problems.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A pre-drainage borehole gas phase fracturing device for low-permeability coal seams includes a main pipeline, a fixing frame fixedly installed on the outside of the main pipeline, connecting pipes fixedly installed on the outside of the main pipeline and arranged sequentially from left to right, and a sealing frame fixedly installed on the outside of the connecting pipe; a cleaning assembly installed on the main pipeline and the fixing frame; and a sealing assembly installed on the connecting pipe and the sealing frame.

[0008] As a further improvement to the above solution, the cleaning assembly includes a motor, a drive shaft, a fixed plate, a rotating frame, a rotating shaft, bevel gears, transmission gears, and a cleaning plate. The motor is fixedly mounted on the top of the fixed frame, the drive shaft is fixedly mounted on the output end of the motor, the fixed plate is fixedly mounted on the inner wall of the main pipe, the rotating frame is rotatably mounted on the inner side of the main pipe and arranged sequentially from left to right, the rotating shaft is rotatably mounted on the inner side of the rotating frame, the bevel gears are fixedly mounted on the outer side of the drive shaft and the rotating shaft, adjacent bevel gears mesh with each other, the transmission gears are fixedly mounted on the left and right sides of the outer side of the rotating shaft, and the cleaning plate is fixedly mounted on one side of the rotating frame.

[0009] As a further improvement to the above solution, the sealing assembly includes a sealing plate, a branch pipe, and a connecting flange. The sealing plate is disposed inside the sealing frame, the branch pipe is disposed inside the connecting pipe, and the connecting flange is fixedly installed on the outside of the branch pipe.

[0010] As a further improvement to the above solution, a T-shaped connecting groove is provided on the top of the sealing frame, the sealing plate is T-shaped, and the sealing plate fits into the connecting groove.

[0011] As a further improvement to the above solution, threaded holes are provided at the four corners of the front side of the sealing frame, sealing plate and connecting flange, and fixing bolts are installed on the inner threads of the threaded holes.

[0012] By adopting the above technical solution, the threaded hole facilitates the connection of the fixing bolt, making the connection between the sealing plate or branch pipe and the sealing frame tighter.

[0013] As a further improvement to the above solution, the inner diameter of the connecting pipe is fitted to the outermost part of the branch pipe at its minimum, and a sealing gasket is provided on one side of the branch pipe.

[0014] By adopting the above technical solution, the connection between the connecting pipe and the branch pipe is made tighter and the sealing performance is better.

[0015] As a further improvement to the above solution, a toothed groove is provided on one side of the rotating frame, and the transmission gear meshes with the adjacent toothed groove.

[0016] By adopting the above technical solution, the tooth groove facilitates the rotation of the transmission gear, which in turn drives the rotating frame to rotate, thereby causing the rotating frame to rotate and clean the cleaning plate.

[0017] As a further improvement to the above solution, a cleaning cloth is provided on the outside of the cleaning plate, the cleaning plate is arc-shaped, and the cleaning plate is in contact with the inner wall of the main pipe.

[0018] By adopting the above technical solution, the cleaning plate can clean the inner wall of the main pipe after rotation, resulting in a better cleaning effect and less residue.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0020] (1) The gas phase fracturing device for pre-extraction drilling of low-permeability coal seam of this utility model, through the cleaning component, can control the motor to drive the drive shaft to rotate during the long-term use of the main pipeline. After the drive shaft rotates, it can drive the rotating shaft to rotate through the bevel gear. After the rotating shaft rotates, it can drive the rotating frame to rotate through the transmission gear. After the rotating frame rotates, it can clean the inner wall of the main pipeline through the cleaning plate. This makes it less likely for gas to adhere to the upper part of the inner wall of the main pipeline during the extraction process, and makes it less likely for the main pipeline to become blocked.

[0021] (2) The gas phase fracturing device for pre-drainage borehole of low permeability coal seam of this utility model has multiple branch pipes connected during the extraction process through the set sealing components. The branch pipes can be fixed above the sealing frame through the connecting flange. In some areas, the sealing frame can be sealed by the sealing plate to prevent gas leakage from the connecting pipe. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a three-dimensional structural schematic diagram of a pre-extraction borehole gas phase fracturing device for low-permeability coal seams proposed in this utility model.

[0024] Figure 2 This is a partial three-dimensional structural diagram of a pre-extraction borehole gas phase fracturing device for low-permeability coal seams proposed in this utility model.

[0025] Figure 3 This is a partial three-dimensional structural diagram of a pre-extraction borehole gas phase fracturing device for low-permeability coal seams proposed in this utility model.

[0026] Figure 4 This is a partial three-dimensional structural diagram of a pre-drainage borehole gas phase fracturing device for low-permeability coal seams proposed in this utility model.

[0027] In the diagram: 1. Main pipe; 2. Fixing bracket; 3. Connecting pipe; 4. Sealing bracket; 5. Motor; 6. Drive shaft; 7. Fixing plate; 8. Rotating bracket; 9. Rotating shaft; 10. Bevel gear; 11. Transmission gear; 12. Cleaning plate; 13. Sealing plate; 14. Branch pipe; 15. Connecting flange. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0029] refer to Figure 1-4 A pre-drainage borehole gas phase fracturing device for low-permeability coal seams includes a main pipeline 1, a fixing frame 2 fixedly installed on the outside of the main pipeline 1, a connecting pipe 3 fixedly installed on the outside of the main pipeline 1 and arranged sequentially from left to right, and a sealing frame 4 fixedly installed on the outside of the connecting pipe 3; a cleaning component installed on the main pipeline 1 and the fixing frame 2; and a sealing component installed on the connecting pipe 3 and the sealing frame 4.

[0030] In this embodiment, the cleaning assembly includes a motor 5, a drive shaft 6, a fixed plate 7, a rotating frame 8, a rotating shaft 9, a bevel gear 10, a transmission gear 11, and a cleaning plate 12. The motor 5 is fixedly installed on the top of the fixed frame 2, the drive shaft 6 is fixedly installed on the output end of the motor 5, the fixed plate 7 is fixedly installed on the inner wall of the main pipe 1, the rotating frame 8 is rotatably installed between the inner sides of the main pipe 1 and arranged sequentially from left to right, the rotating shaft 9 is rotatably installed on the inner side of the rotating frame 8, the bevel gear 10 is fixedly installed on the outer side of the drive shaft 6 and the rotating shaft 9, and adjacent bevel gears 10 mesh with each other, the transmission gear 11 is fixedly installed on the left and right sides of the outer side of the rotating shaft 9, and the cleaning plate 12 is fixedly installed between one side of the rotating frame 8.

[0031] In this embodiment, the sealing assembly includes a sealing plate 13, a branch pipe 14, and a connecting flange 15. The sealing plate 13 is disposed inside the sealing frame 4, the branch pipe 14 is disposed inside the connecting pipe 3, and the connecting flange 15 is fixedly installed on the outside of the branch pipe 14.

[0032] In this embodiment, a T-shaped connecting groove is provided on the top of the sealing frame 4, and the sealing plate 13 is T-shaped, with the sealing plate 13 fitting into the connecting groove.

[0033] In this embodiment, threaded holes are provided at the four front corners of the sealing frame 4, the sealing plate 13, and the connecting flange 15, and fixing bolts are installed on the inner threads of the threaded holes.

[0034] In this embodiment, the inner diameter of the connecting pipe 3 is fitted to the outermost part of the branch pipe 14 at its minimum, and a sealing gasket is provided on one side of the branch pipe 14.

[0035] In this embodiment, a toothed groove is provided on one side of the rotating frame 8, and the transmission gear 11 meshes with the adjacent toothed groove.

[0036] In this embodiment, a cleaning cloth is provided on the outer side of the cleaning plate 12, the cleaning plate 12 is arc-shaped, and the cleaning plate 12 is attached to the inner wall of the main pipe 1.

[0037] One implementation principle of this application embodiment is as follows: During the long-term use of the main pipeline 1, the motor 5 can be controlled to drive the drive shaft 6 to rotate. After the drive shaft 6 rotates, it can drive the rotating shaft 9 to rotate through the bevel gear 10. After the rotating shaft 9 rotates, it can drive the rotating frame 8 to rotate through the transmission gear 11. After the rotating frame 8 rotates, it can clean the inner wall of the main pipeline 1 through the cleaning plate 12, so that the gas is not easy to adhere to the upper part of the inner wall of the main pipeline 1 during the extraction process, and the main pipeline 1 is not easy to be blocked. During the extraction process, multiple branch pipes 14 are connected. The branch pipes 14 can be fixed above the sealing frame 4 through the connecting flange 15. Some areas are connected to the branch pipes 14, and the sealing frame 4 can be sealed by the sealing plate 13, so that the connecting pipe 3 is not easy to leak gas.

[0038] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0039] The above provides a detailed description of the pre-drainage borehole gas-phase fracturing device for low-permeability coal seams provided by this utility model. Specific embodiments have been used to illustrate the principle and implementation of this utility model. The descriptions of these embodiments are merely for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A low permeability coal seam pre-drainage borehole gas phase fracturing device, characterized in that, Include: The outer side of the main pipeline (1) is fixedly installed with a fixed frame (2), the outer side of the main pipeline (1) is fixedly installed with a connecting pipe (3), and from left to right, the outer side of the connecting pipe (3) is fixedly installed with a sealing frame (4); The cleaning assembly is installed on the main pipeline (1) and the fixed frame (2); The sealing assembly is installed on the connecting pipe (3) and the sealing frame (4).

2. The low permeability coal seam pre-drainage borehole gas phase fracturing device according to claim 1, characterized in that, The cleaning assembly includes a motor (5), a drive shaft (6), a fixed plate (7), a rotating frame (8), a rotating shaft (9), a bevel gear (10), a transmission gear (11) and a cleaning plate (12), the motor (5) is fixedly installed on the top of the fixed frame (2), the drive shaft (6) is fixedly installed on the output end of the motor (5), the fixed plate (7) is fixedly installed on the inner wall of the main pipeline (1), the rotating frame (8) is rotatably installed between the inner side of the main pipeline (1), and from left to right, the rotating shaft (9) is rotatably installed on the inner side of the rotating frame (8), the bevel gear (10) is fixedly installed on the outer side of the drive shaft (6) and the rotating shaft (9), the adjacent bevel gears (10) are engaged, the transmission gear (11) is fixedly installed on the outer side of the rotating shaft (9) left and right sides, and the cleaning plate (12) is fixedly installed between one side of the rotating frame (8).

3. The low permeability coal seam pre-drainage borehole gas phase fracturing device according to claim 1, characterized in that, The sealing assembly includes a sealing plate (13), a branch pipe (14), and a connecting flange (15), the sealing plate (13) is arranged on the inner side of the sealing frame (4), the branch pipe (14) is arranged on the inner side of the connecting pipe (3), and the connecting flange (15) is fixedly installed on the outer side of the branch pipe (14).

4. The low permeability coal seam pre-drainage borehole gas phase fracturing device according to claim 3, characterized in that, The top of the sealing frame (4) is provided with a T-shaped connecting groove, the sealing plate (13) is T-shaped, and the sealing plate (13) is fitted with the connecting groove.

5. The low permeability coal seam pre-drainage borehole gas phase fracturing device according to claim 1, characterized in that, The front side of the sealing frame (4), the sealing plate (13) and the connecting flange (15) is provided with a threaded hole, and the inner side of the threaded hole is screwed with a fixing bolt.

6. The low permeability coal seam pre-drainage borehole gas phase fracturing device according to claim 3, characterized in that, The inner diameter of the connecting pipe (3) is fitted with the outer side of the minimum of the branch pipe (14), and the branch pipe (14) is provided with a sealing gasket on one side.

7. The low permeability coal seam pre-drainage borehole gas phase fracturing device according to claim 2, characterized in that, The side of the rotating frame (8) is provided with a gear slot, and the transmission gear (11) is engaged with the adjacent gear slot.

8. The low permeability coal seam pre-drainage borehole gas phase fracturing device according to claim 2, characterized in that, The outer side of the cleaning plate (12) is provided with a cleaning cloth, the cleaning plate (12) is arc-shaped, and the cleaning plate (12) is fitted with the inner wall of the main pipeline (1).

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