Blowout hole prevention device for coal mining drilling

Abstract

The invention discloses a hole spraying prevention device for coal mining drilling, and relates to the technical field of coal mining drilling, the hole spraying prevention device comprises a protection machine body, a sealing pipe body is fixedly connected to the protection machine body, a dilution mechanism is arranged at one end, away from the protection machine body, of the sealing pipe body, and the dilution mechanism comprises a hollow mounting ring; and a plurality of connecting pipes are fixedly connected in the mounting ring. According to the device, the diluting mechanism is arranged, when rock debris impurities discharged through drilling are thick, through cooperation of a mounting ring, a connecting pipe and a liquid outlet hole, the thick impurities entering the protection machine body are diluted, and therefore the phenomenon that the thick impurities are damaged when the thick impurities pass through the protection machine body and are discharged is effectively avoided. According to the drilling machine, the problem that due to the fact that the drilling machine body adheres to a discharging channel of the protection machine body, the discharging space is reduced is solved, meanwhile, the viscosity is reduced by adding water, when the water makes contact with a drill rod, the drill rod cooling effect is achieved, the defects in the prior art are overcome, the discharging smoothness of the protection machine body is improved, and normal drilling work is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of coal mining drilling technology, specifically to a blowout prevention device for coal mining drilling. Background Technology

[0002] When drilling in coal mines, especially in high-gas and soft coal seams, a huge gas pressure difference and ground stress release will be formed in the borehole. Once the high-pressure gas pocket or geological structure zone is penetrated, blowouts can easily be triggered. Therefore, blowout prevention devices are needed to provide auxiliary protection during the drilling process.

[0003] When in use, the device mainly consists of a sealing module and a flow guiding module. The sealing module mainly includes pipes and airbags wrapped around the outer surface of the pipes. When in use, the pipes are inserted into the borehole, and the airbags are inflated to seal and fix the device to the borehole. The flow guiding module is used to discharge the rock and coal cuttings generated during drilling, and when gas is ejected, the flow guiding module can guide the ejected gas to a designated location.

[0004] While the aforementioned device effectively protects the drilling process, in practice, the drill rod requires coolant during drilling. When encountering soft coal seams, the coal is broken into extremely fine powder during drilling, increasing its surface area and making it highly absorbent. This powder, combined with the coolant, forms a viscous discharge that adheres to the inside of the blowout preventer. This narrows the internal chip removal channel, hindering chip removal and, in severe cases, even blocking the channel, thus impeding drilling operations. Summary of the Invention

[0005] In view of this, the present invention proposes a blowout prevention device for drilling in coal mines to solve the problems in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a blowout prevention device for drilling in coal mines, comprising a protective body, a sealing pipe fixedly connected to the protective body, and a dilution mechanism provided at the end of the sealing pipe away from the protective body;

[0007] The dilution mechanism includes a hollow mounting ring with several connecting pipes fixedly connected inside. Multiple liquid outlet holes are formed on the inner surface of the mounting ring, each hole communicating with an adjacent connecting pipe. At least one connecting pipe contains a protective component for sealing the corresponding pipe. The mounting ring is used to add diluent liquid, which is then sprayed out through the connecting pipes from the outlet holes to reduce the viscosity of impurities discharged from the borehole. When the diluent liquid passes through the connecting pipes, it triggers the protective component to release the seal on the connecting pipes.

[0008] Preferably, the protection component includes a sealing block, one end of which is fixedly connected to a column. The diameter of the sealing block is larger than the diameter of the connecting pipe and smaller than the diameter of the liquid outlet. The diameter of the column is smaller than the diameter of the connecting pipe. When the diluent passes through the connecting pipe, it pushes the sealing block to move into the liquid outlet, thereby releasing the seal on the connecting pipe.

[0009] Preferably, at least one guide block is fixedly connected to the outer surface of the column rod, and the guide block is slidably connected to the connecting pipe to guide the sliding of the column rod and the sealing block.

[0010] Preferably, the connecting pipe has an annular groove at one end near the liquid outlet, and the sealing block has the same diameter as the annular groove. The sealing block is located inside the annular groove when sealing the connecting pipe.

[0011] Preferably, a plurality of flow guide blocks are fixedly connected to the inner surface of the mounting ring, the outer surface of the flow guide blocks is set to arc shape, and the flow guide blocks are located on the side of the liquid outlet hole near the bottom of the borehole.

[0012] Preferably, a protective mesh is fixedly connected to each of the liquid outlet holes.

[0013] Preferably, the diluent is water.

[0014] Preferably, the dilution mechanism further includes an adjustment component. The dilution mechanism includes a mounting plate, on which a mounting ring is fixedly connected to the side away from the sealing tube. A connecting ring is slidably connected to the side of the mounting plate away from the mounting ring. An adjustment component is rotatably connected to the mounting plate and bolted to the connecting ring. At least one connecting post is fixedly connected to the side of the connecting ring near the mounting ring. The connecting post passes through the mounting plate and is inserted into the mounting ring. A sliding ring is fixedly connected to one end of the connecting post inside the mounting ring. The outer and inner surfaces of the sliding ring are both in contact with the inner wall of the mounting ring. The sliding ring divides the hollow inner cavity of the mounting ring into two spaces. Several baffles are fixedly connected to the side of the sliding ring near the connecting tube. When the adjustment component rotates, it drives the connecting ring to slide against one end of the mounting plate. When the mounting plate slides, the size of the liquid inlet of the connecting tube is adjusted through the cooperation of the connecting post, the sliding ring, and the baffles.

[0015] Preferably, the baffle plate has a trapezoidal groove on the side away from the sliding ring.

[0016] Preferably, an inlet pipe is fixedly connected to the outer surface of the sealing tube, and an inlet hole is provided inside the sealing tube. The mounting ring, the inlet pipe, and the inlet hole are connected in series.

[0017] Compared with the prior art, the present invention provides a blowout preventer device for drilling in coal mines, which has the following advantages:

[0018] 1. This invention incorporates a dilution mechanism. When the rock cuttings and impurities discharged from the borehole are highly viscous, the installation ring, connecting pipe, and liquid outlet work together to dilute the viscous impurities entering the protective body. This effectively prevents the viscous impurities from adhering to the discharge channel of the protective body and reducing the discharge space as they pass through and are discharged. Furthermore, by adding water to reduce viscosity, the water also cools the drill rod when it comes into contact with it. This overcomes the shortcomings of existing technologies, improves the smoothness of material discharge from the protective body, and ensures the normal operation of the drilling process.

[0019] 2. The adjustment component of this invention can determine the viscosity of the discharge based on geological conditions and adjust the liquid output accordingly. When the viscosity is high, more water is mixed with the more viscous discharge. When the viscosity is low, the liquid output is reduced so that the viscosity of the sprayed water matches that of the discharge, avoiding excessive or insufficient liquid output, saving water resources, and ensuring dilution effect.

[0020] 3. By setting the protective component at the lower liquid outlet, when the dilution mechanism is not in use, under the dual protection of the protective net and the protective component, even if a large amount of discharge is generated below the discharge channel due to gravity, impurities are difficult to enter the mounting ring from the connecting pipe under the dual protection, preventing the accumulation of a large amount of impurities inside the dilution mechanism and causing blockage, thus improving the stability of the dilution mechanism during use. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0022] Figure 2 This is a diagram showing the internal structure of the mounting ring of the present invention;

[0023] Figure 3 This is a partial cross-sectional view of the mounting ring of the present invention;

[0024] Figure 4 For the present invention Figure 3 Enlarged structural diagram at point A in the middle;

[0025] Figure 5 This is a cross-sectional view of the mounting ring and mounting plate of the present invention;

[0026] Figure 6 This is an exploded structural diagram of the dilution mechanism of the present invention.

[0027] In the picture:

[0028] 100. Protective body; 101. Sealed tube body;

[0029] 200. Dilution mechanism; 201. Mounting ring; 202. Connecting pipe; 203. Liquid outlet; 204. Sealing block; 205. Column; 206. Guide block; 207. Flow guide block; 208. Protective net;

[0030] 211. Mounting plate; 212. Connecting ring; 213. Connecting post; 214. Adjusting component; 215. Sliding ring; 216. Baffle plate;

[0031] 301. Liquid inlet pipe; 302. Liquid inlet hole. Detailed Implementation

[0032] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, some features described in the examples may be combined in other examples.

[0033] Example 1

[0034] like Figures 1 to 4 As shown, this embodiment provides a blowout preventer for coal mine drilling, including a protective body 100, a sealing tube 101 fixedly connected to the protective body 100, and a dilution mechanism 200 provided at the end of the sealing tube 101 away from the protective body 100.

[0035] The dilution mechanism 200 includes a mounting ring 201, which is hollow. Several connecting pipes 202 are fixedly connected inside the mounting ring 201. Multiple liquid outlet holes 203 are opened on the inner surface of the mounting ring 201. Each liquid outlet hole 203 is connected to an adjacent connecting pipe 202. At least one connecting pipe 202 is provided with a protective component for sealing the corresponding connecting pipe 202. The mounting ring 201 is used to add diluent liquid, which is sprayed out from the liquid outlet hole 203 through the connecting pipe 202 to reduce the viscosity of impurities discharged from the borehole. When the diluent liquid passes through the connecting pipe 202, it triggers the protective component to release the seal on the connecting pipe 202.

[0036] During the drilling and material discharge process, gravity causes an excess of impurities at the bottom of the borehole. Consequently, when these impurities are discharged into the protective body 100, an excess of impurities will also be discharged from the bottom of the discharge channel of the protective body 100. Therefore, the protective component is installed in the connecting pipe 202 at the bottom of the horizontal center line of the mounting ring 201 to protect the bottom connecting pipe 202 and reduce the probability of impurities entering the connecting pipe 202. At the same time, since the protective component is installed in the connecting pipe 202 at the bottom of the horizontal center line of the mounting ring 201, the sealing block 204 is vertically or inclined upwards and will be affected by gravity. Under normal conditions, it will fit against the top of the corresponding connecting pipe 202 to seal the connecting pipe 202.

[0037] The protective component includes a sealing block 204, one end of which is fixedly connected to a rod 205. The diameter of the sealing block 204 is larger than the inner surface diameter of the connecting pipe 202, and the diameter of the sealing block 204 is smaller than the diameter of the liquid outlet 203. The diameter of the rod 205 is smaller than the inner surface diameter of the connecting pipe 202. When the diluent passes through the connecting pipe 202, it pushes the sealing block 204 to move into the liquid outlet 203, thereby releasing the seal on the connecting pipe 202.

[0038] Furthermore, at least one guide block 206 is fixedly connected to the outer surface of the column rod 205. The guide block 206 is slidably connected to the connecting pipe 202 and is used to guide the sliding of the column rod 205 and the sealing block 204 to prevent skew during sliding and failure to return to the original position properly.

[0039] Furthermore, an annular groove is provided at one end of the connecting pipe 202 near the liquid outlet 203. The sealing block 204 has the same diameter as the annular groove. When sealing the connecting pipe 202, the sealing block 204 is located in the annular groove. Under normal conditions, it is inserted into the annular groove, which has a limiting effect, improving the initial fixation effect and thus improving the stability during sealing.

[0040] Furthermore, several guide blocks 207 are fixedly connected to the inner surface of the mounting ring 201. The outer surface of the guide block 207 is set as arc-shaped. The guide block 207 is located on the side of the liquid outlet 203 near the bottom of the borehole. This allows the discharged material to bounce at the outlet of the liquid outlet 203 through the guidance of the arc-shaped surface of the guide block 207, thereby reducing the accumulation of discharged material at the outlet of the liquid outlet 203.

[0041] Furthermore, a protective mesh 208 is fixedly connected inside each liquid outlet 203 to prevent larger impurities from entering the hole and causing blockage.

[0042] A liquid inlet pipe 301 is fixedly connected to the outer surface of the sealing tube body 101, and a liquid inlet hole 302 is opened inside the sealing tube body 101. The mounting ring 201, the liquid inlet pipe 301 and the liquid inlet hole 302 are connected.

[0043] Furthermore, using water as the diluent provides a good dilution effect, avoids chemical reactions, is relatively stable, and has a low cost.

[0044] Alternatively, the diluent can be a mine antifreeze or dust suppressant solution, which has wetting and dispersing functions. However, its compatibility and safety with the entire system must be confirmed before use.

[0045] Example 2

[0046] like Figures 1 to 6 As shown, this embodiment provides a blowout preventer device for coal mine drilling, including a protective body 100. A sealing pipe 101 is fixedly connected to the protective body 100. A dilution mechanism 200 is provided at the end of the sealing pipe 101 away from the protective body 100. The dilution mechanism 200 includes a mounting ring 201, which is hollow. Several connecting pipes 202 are fixedly connected inside the mounting ring 201. Multiple liquid outlet holes 203 are opened on the inner surface of the mounting ring 201. Each liquid outlet hole 203 is connected to an adjacent connecting pipe 202. At least one connecting pipe 202 is provided with a protective component for sealing the corresponding connecting pipe 202. The mounting ring 201 is used for... A diluent is added and sprayed out from the outlet hole 203 through the connecting pipe 202 to reduce the viscosity of impurities discharged from the borehole. When the diluent passes through the connecting pipe 202, it triggers a protective component to release the seal on the connecting pipe 202. The protective component includes a sealing block 204, one end of which is fixedly connected to a rod 205. The diameter of the sealing block 204 is larger than the inner surface diameter of the connecting pipe 202 and smaller than the diameter of the outlet hole 203. The diameter of the rod 205 is smaller than the inner surface diameter of the connecting pipe 202. When the diluent passes through the connecting pipe 202, it pushes the sealing block 204 to move into the outlet hole 203, thus releasing the seal on the connecting pipe 202.

[0047] At least one guide block 206 is fixedly connected to the outer surface of the column rod 205. The guide block 206 is slidably connected to the connecting pipe 202 and is used to guide the sliding of the column rod 205 and the sealing block 204. An annular groove is opened at one end of the connecting pipe 202 near the liquid outlet 203. The sealing block 204 has the same diameter as the annular groove. When sealing the connecting pipe 202, the sealing block 204 is located in the annular groove. Several guide blocks 207 are fixedly connected to the inner surface of the mounting ring 201. The outer surface of the guide block 207 is set to arc shape. The guide block 207 is located on the side of the liquid outlet 203 near the bottom of the borehole. A protective net 208 is fixedly connected in each liquid outlet 203. The diluent is water. An inlet pipe 301 is fixedly connected to the outer surface of the sealing pipe body 101. An inlet hole 302 is opened in the sealing pipe body 101. The mounting ring 201, the inlet pipe 301 and the inlet hole 302 are connected.

[0048] The dilution mechanism 200 also includes an adjustment assembly. The dilution mechanism 200 includes a mounting plate 211, with a mounting ring 201 fixedly connected to the side of the mounting plate 211 away from the sealing tube 101. A connecting ring 212 is slidably connected to the side of the mounting plate 211 away from the mounting ring 201. An adjustment element 214 is rotatably connected to the mounting plate 211 and bolted to the connecting ring 212. At least one connecting post 213 is fixedly connected to the side of the connecting ring 212 near the mounting ring 201. The connecting post 213 penetrates the mounting plate 211 and inserts into the mounting ring 201. A sliding ring 215 is fixedly connected to one end of the column 213 inside the mounting ring 201. The outer and inner surfaces of the sliding ring 215 are in contact with the inner wall of the mounting ring 201. The sliding ring 215 divides the hollow inner cavity of the mounting ring 201 into two spaces. Several baffles 216 are fixedly connected to the side of the sliding ring 215 near the connecting pipe 202. When the adjusting component 214 rotates, it drives the connecting ring 212 to slide against one end of the mounting plate 211. When the mounting plate 211 slides, the size of the liquid inlet of the connecting pipe 202 is adjusted through the cooperation of the connecting column 213, the sliding ring 215 and the baffles 216.

[0049] Furthermore, the baffle 216 has a trapezoidal groove on the side away from the sliding ring 215, so that the bottom column 205 is located in the groove, which not only blocks the size of the liquid inlet of the connecting pipe 202, but also does not interfere with the column 205.

[0050] The working principle of all the content in the above embodiments is as follows:

[0051] Initial state: During the drilling and material discharge process, gravity causes more impurities at the bottom of the borehole. Consequently, when the impurities are discharged to the protective body 100, more impurities will also be discharged at the bottom of the discharge channel of the protective body 100. Therefore, the protective component is set in the connecting pipe 202 at the bottom of the horizontal center line of the mounting ring 201 to protect the bottom connecting pipe 202 and reduce the probability of impurities entering the connecting pipe 202. At this time, the sealing block 204 at the bottom of the mounting ring 201 is affected by gravity and is located in the annular groove at the end of the connecting pipe 202 near the liquid outlet 203. At this time, the connecting pipe 202 is in a sealed state. The liquid inlet pipe 301 is fixedly connected to the output end of the external pump body, and the liquid inlet end of the external pump body is fixedly connected to the liquid outlet end of the external storage tank.

[0052] The following describes the working principle and beneficial effects of the dilution mechanism 200:

[0053] When drilling into a rock stratum that is easily absorbing water and becomes viscous, after the sealing pipe 101 and the protective body 100 are installed, when the drill rod is drilling, the discharged impurities enter the protective body 100, and the external pump is turned on. The external pump delivers water from the external storage tank to the inlet pipe 301 and the inlet hole 302, and then into the mounting ring 201. When the water volume in the mounting ring 201 reaches the set amount, the water will push the sealing block 204 close to one end of the connecting pipe 202, thereby causing the sealing block 204 to be positioned between the column rod 205 and the guide block 206. Guided by the flow path, the water slides into the outlet hole 203. Since the diameter of the sealing block 204 is smaller than the diameter of the outlet hole 203, when the sealing block 204 enters the hollow cavity of the outlet hole 203, the sealing block 204 cancels the seal on the connecting pipe 202. When the sealing block 204 enters the outlet hole 203, water will flow out from the space between the sealing block 204 and the outlet hole 203 and enter the space between the mounting ring 201 and the drill rod. At this time, the water enters the chip removal channel between the drill rod and the mounting ring 201. The added water can dilute the viscous impurities.

[0054] By setting up a dilution mechanism 200, when the rock cuttings and impurities discharged from the borehole are relatively viscous, the viscous impurities entering the protective body 100 are diluted through the cooperation of the mounting ring 201, connecting pipe 202 and liquid outlet 203. This effectively avoids the problem of viscous impurities adhering to the discharge channel of the protective body 100 and reducing the discharge space when passing through and being discharged. At the same time, while adding water to reduce viscosity, the water also has the function of cooling the drill rod when it comes into contact with the drill rod. This overcomes the shortcomings of the existing technology, improves the smoothness of the discharge of the protective body 100, and ensures the normal operation of the drilling work.

[0055] Furthermore, by setting the lower liquid outlet 203 of the protective component, when the dilution mechanism 200 is not in use, under the dual protection of the protective net 208 and the protective component, even if a large amount of discharge is generated below the discharge channel due to gravity, impurities are difficult to enter the mounting ring 201 from the connecting pipe 202, preventing the accumulation of a large amount of impurities inside the dilution mechanism 200 and causing blockage, thus improving the stability of the dilution mechanism 200 during use.

[0056] Furthermore, by setting the guide block 207, when the discharge passes through the outlet of the liquid outlet 203, the guide block 207's arc-shaped surface causes the discharge to bounce at the outlet of the liquid outlet 203, thereby reducing the accumulation of discharge at the outlet of the liquid outlet 203. At the same time, the inclined surface of the guide block 207 covers a part of the liquid outlet 203, changing the direction of liquid discharge, thereby increasing the spray range and improving dilution efficiency.

[0057] Furthermore, by adjusting the component settings, the viscosity of the discharged material can be determined based on geological conditions before the protective body 100 is used. If the discharge is normal, the liquid inlet operation can be stopped. If the viscosity is high, the adjusting component 214 can be rotated. Since the adjusting component 214 is rotatably connected to the mounting plate 211 and threadedly connected to the connecting ring 212, when the adjusting component 214 rotates, the connecting ring 212 moves away from the connecting pipe 202 under the guidance of the sliding groove of the mounting plate 211. Then, under the action of the connecting column 213, it drives the sliding ring 215 to slide simultaneously. When the sliding ring 215 slides, it can simultaneously drive multiple baffles 216 to move towards... Sliding away from the connecting pipe 202 reduces the obstruction area of ​​the baffle 216 on the inlet of the connecting pipe 202, thereby increasing the liquid inlet of the connecting pipe 202 and the liquid outlet 203. This allows more water to mix with the more viscous discharge, ensuring a dilution effect. When the viscosity is low, the adjusting component 214 can be rotated in the opposite direction to move the baffle 216 toward the connecting pipe 202, increasing the coverage area of ​​the inlet of the connecting pipe 202 and reducing the liquid outlet. This ensures that the viscosity of the sprayed water matches that of the discharge, avoiding excessive or insufficient liquid outlet, saving water, and ensuring a dilution effect.

[0058] It should be noted that a protective component is installed inside the bottom connecting pipe 202, and the column rod 205 is located in the middle of the connecting pipe 202. At the same time, in the initial state, the column rod 205 is also located in the trapezoidal groove of the baffle 216, thereby ensuring subsequent adjustment work.

[0059] The embodiments of the present invention have been described above, but the embodiments are not limited to the specific implementation methods described above. The specific implementation methods described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the embodiments described above, all of which are within the protection scope of the embodiments described above.

Claims

1. A blowout preventer for coal mine drilling, comprising a protective body (100), wherein a sealing pipe (101) is fixedly connected to the protective body (100), characterized in that, A dilution mechanism (200) is provided at the end of the sealed tube (101) away from the protective body (100). The dilution mechanism (200) includes a mounting ring (201), which is hollow. Several connecting pipes (202) are fixedly connected inside the mounting ring (201). Multiple liquid outlet holes (203) are opened on the inner surface of the mounting ring (201). Each liquid outlet hole (203) is connected to an adjacent connecting pipe (202). At least one connecting pipe (202) is provided with a protective component for sealing the corresponding connecting pipe (202). The mounting ring (201) is used to add diluent liquid, which is sprayed out from the liquid outlet hole (203) through the connecting pipe (202) to reduce the viscosity of impurities discharged from the borehole. When the diluent liquid passes through the connecting pipe (202), it triggers the protective component to release the seal on the connecting pipe (202).

2. The blowout prevention device for coal mine drilling according to claim 1, characterized in that: The protective component includes a sealing block (204), one end of which is fixedly connected to a rod (205). The diameter of the sealing block (204) is larger than the inner diameter of the connecting pipe (202), and the diameter of the sealing block (204) is smaller than the diameter of the liquid outlet (203). The diameter of the rod (205) is smaller than the inner diameter of the connecting pipe (202). When the diluent passes through the connecting pipe (202), it pushes the sealing block (204) to move into the liquid outlet (203), thereby releasing the seal on the connecting pipe (202).

3. A blowout preventer device for coal mine drilling according to claim 2, characterized in that: At least one guide block (206) is fixedly connected to the outer surface of the column (205). The guide block (206) is slidably connected to the connecting pipe (202) and is used to guide the sliding of the column (205) and the sealing block (204).

4. A blowout prevention device for coal mine drilling according to claim 2, characterized in that: The connecting pipe (202) has an annular groove at one end near the liquid outlet (203), and the sealing block (204) has the same diameter as the annular groove. The sealing block (204) is located inside the annular groove when sealing the connecting pipe (202).

5. A blowout prevention device for coal mine drilling according to claim 1, characterized in that: The inner surface of the mounting ring (201) is fixedly connected with several guide blocks (207). The outer surface of the guide block (207) is set as arc. The guide block (207) is located on the side of the liquid outlet hole (203) near the bottom of the borehole.

6. A blowout preventer device for coal mine drilling according to claim 1, characterized in that: Each of the liquid outlet holes (203) is fixedly connected with a protective net (208).

7. A blowout preventer device for coal mine drilling according to claim 1, characterized in that: The diluent is water.

8. A blowout prevention device for coal mine drilling according to claim 1, characterized in that: The dilution mechanism (200) further includes an adjustment assembly. The dilution mechanism (200) includes a mounting plate (211). The mounting plate (211) is fixedly connected to the side of the mounting ring (201) away from the sealing tube (101). A connecting ring (212) is slidably connected to the side of the mounting plate (211) away from the mounting ring (201). An adjustment component (214) is rotatably connected to the mounting plate (211). The adjustment component (214) is bolted to the connecting ring (212). At least one connecting post (213) is fixedly connected to the side of the connecting ring (212) near the mounting ring (201). The connecting post (213) passes through the mounting plate (211) and is inserted into the mounting ring (201). The connecting post (213) is located inside the mounting ring (201) and a sliding ring (215) is fixedly connected to one end. The outer and inner surfaces of the sliding ring (215) are in contact with the inner wall of the mounting ring (201). The sliding ring (215) divides the hollow inner cavity of the mounting ring (201) into two spaces. Several baffles (216) are fixedly connected to the side of the sliding ring (215) near the connecting pipe (202). When the adjusting member (214) rotates, it drives the connecting ring (212) to slide against one end of the mounting plate (211). When the mounting plate (211) slides, the size of the liquid inlet of the connecting pipe (202) is adjusted by the cooperation of the connecting post (213), the sliding ring (215) and the baffles (216).

9. A blowout prevention device for coal mine drilling according to claim 8, characterized in that: The baffle (216) has a trapezoidal groove on the side away from the sliding ring (215).

10. A blowout prevention device for coal mine drilling according to claim 1, characterized in that: The outer surface of the sealing tube (101) is fixedly connected to the liquid inlet pipe (301), and the sealing tube (101) is provided with a liquid inlet hole (302). The mounting ring (201), the liquid inlet pipe (301) and the liquid inlet hole (302) are connected.

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