Drilling, sealing, grouting and pressurizing device

Abstract

The utility model belongs to the technical field of hole drilling and sealing in the gas extraction process, and particularly discloses a hole drilling and sealing grouting supercharging device which comprises two hole sealing bags arranged in a spaced mode, a grouting pipe and a gas extraction pipe penetrate through the two hole sealing bags, and a grouting section is formed between the two hole sealing bags. An explosion valve is arranged on the grouting pipe located in the grouting section, grouting holes communicated with the interior of the hole sealing bag are formed in the grouting pipe, and the front end of the gas extraction pipe extends into the drill hole in the front end of the hole sealing bag at the front end and is provided with an extraction hole; and a limiting mechanism used for limiting the hole sealing bag at the rear end from falling off is arranged in the drill hole at the rear end of the hole sealing bag at the rear end. According to the pressurizing device, after the hole sealing bag blocks a drill hole, the limiting mechanism limits the hole sealing bag at the rear end to fall off, larger grouting pressure can be borne, grouting liquid can smoothly enter small gaps after the pressure is increased, and therefore more compact blocking is achieved, and the gas extraction efficiency and concentration can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of drilling hole sealing in a gas extraction process, in particular to a drilling hole sealing grouting and pressurizing device. Background Art

[0002] Coal is an important source of energy, but gas disasters seriously restrict the efficient mining of coal. Therefore, pre-extraction of gas is required before coal mining. While effectively preventing gas outburst accidents, high-concentration gas can also be used as an efficient energy source in industrial production and residents' daily lives.

[0003] At present, the most commonly used gas extraction drilling sealing method in coal mines is the "two blocking and one injection" method, which can effectively block to a certain extent. Theoretically, when the grouting pressure is large enough, the grouting liquid can enter the cracks in the hole wall under the action of expansion pressure. However, in actual use, it is found that when slurry flows out of the return pipe (that is, grouting is stopped), the grouting pressure is not high (about 1.6MPa), and this pressure cannot make the slurry enter the small gaps smoothly. However, if the pressure continues to be increased, the bag will fall off, resulting in sealing failure. This is also one of the important reasons for the leakage of this sealing method in the later stage.

[0004] In order to solve the problem that the grouting pressure is not high enough, a drilling and sealing grouting booster device is urgently needed to be designed. Summary of the invention

[0005] In order to solve the above technical problems, the utility model provides a drilling and sealing grouting pressurization device.

[0006] In order to achieve the above-mentioned purpose, the utility model is implemented according to the following technical scheme:

[0007] A drilling hole sealing and grouting pressurization device comprises two hole sealing bags arranged at intervals in a borehole, a grouting pipe and a gas extraction pipe are provided through the two hole sealing bags, a grouting section is formed between the two hole sealing bags, a bursting valve is provided on the grouting pipe in the grouting section, grouting holes connected to the interior of the hole sealing bag are opened on the grouting pipes in the hole sealing bag, the front end of the gas extraction pipe extends into the borehole at the front end of the front hole sealing bag and is provided with an extraction hole; a limiting mechanism for limiting the rear end of the hole sealing bag from falling off is provided in the borehole at the rear end of the hole sealing bag.

[0008] Furthermore, the limiting mechanism comprises a first disc, a cutter disc, a second disc, and a driving motor. The front end surface of the second disc is arranged close to the rear end of the sealing bag at the rear end. The first disc is arranged at the rear end of the second disc. The driving motor is fixed to the center of the rear end surface of the first disc. The front end of the output shaft of the driving motor is rotatably mounted on the center of the second disc through a bearing, and the rear end of the output shaft of the driving motor is rotatably mounted on the center of the first disc through a bearing. The center of the cutter disc is fixed on the output shaft of the driving motor between the first disc and the second disc. The rear end surface of the cutter disc is circumferentially mounted with a plurality of arc-shaped blades through a pin shaft. The arc-shaped blades can be completely received in the rear end surface of the cutter disc when rotating. A limiting column is provided on the rear end surface of the cutter disc on one side of the pin shaft, and a limiting notch is provided at the rear end of the arc-shaped blade. When the arc-shaped blade is fully unfolded, the limiting column abuts against the limiting notch. Grouting pipe holes, extraction pipe holes and anti-slurry pipe holes are provided on the first disc, the cutter disc and the second disc. An anti-slurry pipe is installed in the anti-slurry pipe hole. The front end of the anti-slurry pipe passes through the sealing bag at the rear end and extends to the grouting section.

[0009] Furthermore, an annular slideway is provided on the rear end surface of the second disc, and an annular slip ring slidably matched with the annular slideway is provided on the front end surface of the cutter disc.

[0010] Preferably, the drive motor is a servo motor.

[0011] Compared with the prior art, after the sealing bag seals the drill hole, the booster device of the utility model limits the sealing bag at the rear end from falling off by the limiting mechanism, and can withstand greater grouting pressure. After the pressure is increased, the grouting liquid can smoothly enter the small gaps, thereby achieving a denser seal, which can effectively improve the gas extraction efficiency and concentration. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the drilling, sealing and grouting pressurization device of the utility model.

[0013] Figure 2 It is a structural schematic diagram of the limiting mechanism of the utility model.

[0014] Figure 3 It is a structural schematic diagram of the cutter disc of the limiting mechanism of the utility model.

[0015] Figure 4 It is a schematic structural diagram of the blade on the cutter disc of the limiting mechanism of the utility model after being unfolded.

[0016] Figure 5 for Figure 2 Enlarged view of point A. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail in combination with the embodiments below. The specific embodiments described here are only used to explain the utility model and are not used to limit the invention.

[0018] like Figure 1-Figure 5 As shown, this embodiment exemplarily shows a drilling hole sealing grouting and pressurizing device, including two sealing bags arranged at intervals in the borehole, respectively denoted as the front end bag 5 and the rear end bag 6, a grouting pipe 2 and a gas extraction pipe 3 are arranged through the front end bag 5 and the rear end bag 6, a grouting section is formed between the front end bag 5 and the rear end bag 6, a bursting valve 7 is provided on the grouting pipe 2 in the grouting section, and grouting holes (not shown in the figure) connected to the inside of the sealing bag are opened on the grouting pipes 2 in the front end bag 5 and the rear end bag 6, the front end of the gas extraction pipe 3 extends to the borehole 1 at the front end of the front end bag 5 and is provided with an extraction hole 8; the borehole 1 at the rear end of the rear end bag 6 is provided with a limiting mechanism 9 for limiting the rear end of the sealing bag from falling off.

[0019] Specifically, refer to Figure 2-Figure 5 The limiting mechanism of this embodiment includes a first disc 96, a knife disc 92, a second disc 91, and a driving motor 95. The front end surface of the second disc 91 is arranged close to the rear end of the rear end bag 6. The first disc 96 is arranged at the rear end of the second disc 91. The driving motor 95 is fixed at the center of the rear end surface of the first disc 96. The front end of the output shaft of the driving motor 95 is rotatably mounted at the center of the second disc 91 through a bearing 93. The rear end of the output shaft of the driving motor 95 is rotatably mounted at the center of the first disc 96 through a bearing 93. The driving motor 95 is a servo motor, and its purpose is to drive the knife disc 92 to rotate forward or reverse according to needs; the center of the knife disc 92 is fixed on the first disc 96 and the second disc 96. On the output shaft 94 of the driving motor 95 between the discs 91, a plurality of arc-shaped blades 97 are rotatably installed on the rear end surface of the cutter disc 92 in the circumferential direction through a pin shaft 98. The arc-shaped blades 97 can be completely received in the rear end surface of the cutter disc 92 when rotating. A limiting column 99 is provided on the rear end surface of the cutter disc 92 on one side of the pin shaft 98. A limiting notch is provided at the rear end of the arc-shaped blade 97. When the arc-shaped blade 97 is fully unfolded, the limiting column 99 abuts against the limiting notch. Grouting pipe holes 10, extraction pipe holes 11 and reverse slurry pipe holes 12 are all provided on the first disc 96, the cutter disc 92 and the second disc 91. A reverse slurry pipe 4 is installed in the reverse slurry pipe hole 12. The front end of the reverse slurry pipe 4 passes through the rear end bag 6 and extends to the grouting section.

[0020] During actual use, in order to maintain stability when the drive motor 95 drives the cutter disc 92 to rotate, an annular slide 911 is provided on the rear end face of the second disc 91, and an annular slip ring 921 that slidably cooperates with the annular slide 911 is provided on the front end face of the cutter disc 92.

[0021] Reference Figure 1 , Figure 3 and Figure 4 When in use, the front end bag 5 and the rear end bag 6 are sent into the borehole 1 together with the pipes. When grouting is firstly performed into the front end bag 5 and the rear end bag 6 through the grouting pipe 2, the front end bag 5 and the rear end bag 6 expand as a result. When expanded to a diameter equivalent to that of the borehole 1, the front end bag 5 and the rear end bag 6 can be fixed in the borehole 1 due to the friction force and will not fall off. A closed space without grouting liquid is formed between the front end bag 5 and the rear end bag 6. At this time, the bursting valve 7 explodes, and the slurry will flow into the space, thereby forming a blockage. When the grouting liquid is filled (since the grouting pressure is not high, the small pores in the hole wall are not fully filled at this time), the slurry begins to flow out of the anti-slurry pipe 4. The device of the utility model begins to work:

[0022] 1) When slurry is found to flow out of the anti-slurry pipe 4;

[0023] 2) Start the drive motor 95, such as Figure 1 As shown, the drive motor 95 rotates clockwise;

[0024] 3) The drive motor 95 rotates clockwise to drive the cutter head 92 to rotate clockwise. At this time, the arc-shaped blade 97 is unfolded under the action of centrifugal force and cuts the wall of the drill hole 1 during the rotation process;

[0025] 4) After cutting, it is embedded in the wall of the drill hole 1 without retracting, and presses against the rear end bag 6 to prevent it from falling off;

[0026] 5) Continue grouting in grouting pipe 2 until the grouting pressure reaches a level sufficient to seal all pores.

[0027] The technical solution of the present utility model is not limited to the above-mentioned specific embodiments, and all technical variations made according to the technical solution of the present utility model fall within the protection scope of the present utility model.

Claims

1. A drilling hole sealing grouting and pressurizing device, comprising two hole sealing bags arranged at intervals in a borehole, a grouting pipe and a gas extraction pipe are provided through the two hole sealing bags, a grouting section is formed between the two hole sealing bags, a bursting valve is provided on the grouting pipe in the grouting section, and grouting holes communicating with the inside of the hole sealing bag are provided on the grouting pipes in the hole sealing bag, and the front end of the gas extraction pipe extends into the borehole at the front end of the hole sealing bag and is provided with an extraction hole; it is characterized in that: A limiting mechanism for limiting the rear end sealing bag from falling off is arranged in the drilled hole at the rear end of the rear end sealing bag.

2. The drilling hole sealing grouting pressurization device according to claim 1 is characterized in that: The limiting mechanism comprises a first disc, a cutter disc, a second disc and a driving motor. The front end surface of the second disc is arranged close to the rear end of the sealing bag at the rear end. The first disc is arranged at the rear end of the second disc. The driving motor is fixed to the center of the rear end surface of the first disc. The front end of the output shaft of the driving motor is rotatably mounted at the center of the second disc through a bearing, and the rear end of the output shaft of the driving motor is rotatably mounted at the center of the first disc through a bearing. The center of the cutter disc is fixed on the output shaft of the driving motor between the first disc and the second disc. The rear end surface of the cutter disc is circumferentially rotatably mounted with a plurality of arc-shaped blades through a pin shaft. The arc-shaped blades can be completely received in the rear end surface of the cutter disc when rotating. A limiting column is provided on the rear end surface of the cutter disc on one side of the pin shaft, and a limiting notch is provided at the rear end of the arc-shaped blade. When the arc-shaped blade is fully unfolded, the limiting column abuts against the limiting notch. Grouting pipe holes, extraction pipe holes and anti-slurry pipe holes are provided on the first disc, the cutter disc and the second disc. An anti-slurry pipe is installed in the anti-slurry pipe hole. The front end of the anti-slurry pipe passes through the sealing bag at the rear end and extends to the grouting section.

3. The drilling hole sealing grouting pressurization device according to claim 2 is characterized in that: An annular slideway is provided on the rear end surface of the second disc, and an annular slip ring slidably matched with the annular slideway is provided on the front end surface of the cutter disc.

4. The drilling hole sealing grouting pressurization device according to claim 2 is characterized in that: The driving motor is a servo motor.

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