Drilling tool for coal mine fire prevention and extinguishing injection gel

Abstract

The application discloses a drilling tool for coal mine fire prevention and extinguishing injection gel, which comprises a driving mechanism, a drill bit, a drill rod and a grouting mechanism, the drill bit comprises a reaming assembly, and a guide head is arranged at one end of the reaming assembly; the reaming assembly is hollow and communicates with the outside through a plurality of first through holes; the drill rod comprises a first rod, an intermediate rod and a tail rod which are sequentially connected, the intermediate rod is located in a drill hole and communicates with the drill hole through a plurality of glue injection holes, and the tail rod is fixedly connected with one end of the reaming assembly away from the guide head and communicates with the reaming assembly; a blockage prevention assembly is arranged in the glue injection hole; the grouting mechanism comprises a liquid inlet assembly rotatably sleeved outside the first rod, the liquid inlet assembly communicates with an inner cavity of the first rod; and the liquid inlet assembly is communicated with a liquid storage assembly. The drilling tool has the functions of drilling and glue injection, does not need to be separately provided with a grouting pipe, improves the glue injection efficiency, effectively prevents the glue injection hole from being blocked during drilling, improves the glue injection quality, improves the work efficiency, and reduces the work load.

Description

Technical Field

[0001] This invention relates to the field of coal mine fire prevention and extinguishing technology, and in particular to a drilling tool for injecting gel for coal mine fire prevention and extinguishing. Background Technology

[0002] There are a lot of fissures in broken and loose coal. These pores provide sufficient oxygen and heat storage conditions for spontaneous combustion of coal. Therefore, spontaneous combustion of coal often occurs in underground coal mines, which seriously affects underground safety. In order to prevent spontaneous combustion of coal, grouting, foam gel, foam and other materials are usually used to prevent spontaneous combustion of coal seams.

[0003] The grouting process in coal seams typically involves drilling into the coal seam, then withdrawing the drill bit before proceeding with grouting, or injecting gel into the borehole through the cavities or gaps of the drill bit. However, after the drill bit is withdrawn, the loose coal seam around the borehole and the excavated dust can easily clog it, preventing the gel from being injected into the entire borehole area, or even preventing gel injection altogether. If a grouting pipe is installed for grouting, it needs to be reassembled, and the dust in the borehole needs to be blown out, resulting in low efficiency and high operational difficulty, making it difficult to lower the grouting pipe back into the borehole, thus creating a large number of unused boreholes. Directly injecting gel through the cavities or gaps of the drill bit requires opening an outlet on the side wall of the drill bit, which is easily blocked during drilling, preventing gel from being dispensed and affecting the injection efficiency. It also creates gaps in the gel injection, resulting in insufficient anti-spontaneous combustion effect.

[0004] Therefore, there is an urgent need for a drilling tool for injecting gel for fire prevention and extinguishing in coal mines to solve the above-mentioned technical problems. Summary of the Invention

[0005] The purpose of this invention is to provide a drilling tool for injecting gel for fire prevention and extinguishing in coal mines, so as to solve the problems existing in the prior art.

[0006] To achieve the above objectives, the present invention provides the following solution: The present invention provides a drilling tool for injecting gel for fire prevention and extinguishing in coal mines, comprising:

[0007] A drive mechanism is used to drive the drill bit to drill out of the borehole;

[0008] A drill bit used to break through a coal seam and drill a borehole, the drill bit including a borehole reaming assembly, one end of which is equipped with a guide head; the borehole reaming assembly is hollow and communicates with the outside through a plurality of first through holes.

[0009] The drill rod includes a head rod that is driven and connected to the drive mechanism. A plurality of intermediate rods are detachably connected to the end of the head rod away from the drive mechanism. The intermediate rods are located inside the drill hole and communicate with the drill hole through a plurality of injection holes. A tail rod is detachably connected to the intermediate rod at the tail end. The tail rod is fixedly connected to and communicates with the end of the hole reaming assembly away from the guide head. An anti-clogging component is provided in the injection hole.

[0010] The grouting mechanism includes a liquid inlet assembly rotatably sleeved outside the first rod, the liquid inlet assembly communicating with the inner cavity of the first rod; the liquid inlet assembly is connected to a liquid storage assembly.

[0011] Preferably, the reaming assembly includes a central tube installed at the end of the tail rod, and the guide head is fixed to the end of the central tube away from the tail rod; the first through hole is opened through the outer wall of the central tube, and a plurality of reaming blades are fixed to the outer wall of the central tube, with the first through hole and the reaming blades spaced apart; a plurality of fragments are fixed to the end of the reaming blade away from the central tube.

[0012] Preferably, a connecting groove is provided at one end of the central tube facing the tail rod, and a connector adapted to the connecting groove is fixedly connected to the tail rod, and the connecting groove is threadedly connected to the connector; a corresponding keyway is provided on the connecting groove and the connector, and a connecting key is detachably connected in the keyway.

[0013] Preferably, the intermediate rod is hollow; one end of the intermediate rod is fixedly connected to an intermediate joint, and the other end of the intermediate rod is fixedly connected to an intermediate groove; the intermediate joint is adapted to the intermediate groove; the end of the first rod away from the driving mechanism is fixedly connected to the intermediate joint, and the end of the tail rod facing the driving mechanism is fixedly connected to the intermediate groove.

[0014] Preferably, a one-way valve is installed in the inner cavity of the intermediate rod, and all one-way valves open in one direction toward the intermediate joint.

[0015] Preferably, the liquid inlet assembly includes a liquid inlet tank rotatably sleeved outside the first rod, the inlet of the liquid inlet tank being connected to the liquid storage assembly; a sealed bearing is provided between the side wall of the liquid inlet tank and the first rod; the portion of the first rod located inside the liquid inlet tank has a plurality of liquid inlet holes, the liquid inlet holes being connected to the inner cavity of the first rod, and a one-way component is provided inside the liquid inlet holes.

[0016] Preferably, the unidirectional component includes a fixed screen and a blocking block respectively disposed at both ends of the liquid inlet. The blocking block is located in the inner cavity of the first rod and is detachably connected to the liquid inlet. The fixed screen is fixedly connected to the inner cavity of the liquid inlet. A telescopic rod is fixedly connected between the blocking block and the fixed screen. A first spring is sleeved on the telescopic rod. The two ends of the first spring are fixedly connected to the fixed screen and the blocking block respectively.

[0017] Preferably, the anti-clogging component includes a fixed cover fixedly connected to the inner cavity of the intermediate rod, the fixed cover being correspondingly arranged with the glue injection hole, and the fixed cover having a plurality of connecting holes; a glue injection plate is slidably sealed to one end of the glue injection hole near the fixed cover, and a second spring is fixedly connected between the glue injection plate and the fixed cover; a spiral guide plate is fixedly connected inside the glue injection hole, and the spiral guide plate is located at the end of the glue injection hole away from the fixed cover.

[0018] Preferably, the glue injection plate has a plurality of glue passage holes, and the fixing cover is fixedly connected with a glue-blocking rod corresponding to the plurality of glue passage holes. The glue-blocking rod is detachably connected to the glue passage holes and is interference-fitted.

[0019] Preferably, the drive mechanism includes a propulsion assembly, which is drivenly connected to a drilling motor, and the output shaft of the drilling motor is drivenly connected to the first rod.

[0020] This invention discloses the following technical effects: This invention discloses a drilling tool for injecting fire-resistant gel into loose coal seams, mainly used to inject fire-resistant gel into loose coal seams to prevent spontaneous combustion and reduce underground hazards; a drive mechanism provides power for drilling, the drill bit rotates under the drive mechanism, the guide head is conical to pierce the coal seam ahead, the borehole enlargement assembly expands the borehole during rotation to facilitate subsequent gel injection, the first through hole is used to spray cooling water outward to reduce the temperature of the drill bit and prevent high-temperature damage or ignition of the coal seam; the drill rod transmits the power of the drive mechanism to the drill bit, including the drive... The mechanism includes a head rod connected to the drill bit drive and a tail rod connected to the drill bit drive. Several intermediate rods can be added between the head rod and the tail rod to allow the drill bit to drill to a predetermined depth. The injection holes on the outer walls of the intermediate rods are used to inject gel into the borehole and press it into the surrounding coal seam, isolating the coal seam and preventing spontaneous combustion. An anti-clogging component prevents the injection holes from becoming blocked during drilling and also functions as a one-way check valve. The grouting mechanism's liquid inlet component injects cooling water or fluid gel into the drill rod. The cooling water cools the drill bit during drilling, and the gel is injected into the surrounding coal seam after drilling is completed. This is convenient and quick, eliminating the need for a separate grouting pipe after drilling. This invention's drill bit combines drilling and injection functions, eliminating the need for a separate grouting pipe, improving injection efficiency, effectively preventing injection hole blockage during drilling, improving injection quality, increasing work efficiency, and reducing workload. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is an axial view of the drilling tool for injecting gel for fire prevention and extinguishing in coal mines according to the present invention;

[0023] Figure 2 This is a front view of the drilling tool for injecting gel for fire prevention and extinguishing in coal mines according to the present invention;

[0024] Figure 3 This is an axial view of the drill bit of the present invention;

[0025] Figure 4 This is a schematic diagram of the main structure of the drill bit of the present invention;

[0026] Figure 5 This is a schematic diagram of the intermediate rod structure of the present invention;

[0027] Figure 6 for Figure 5 A magnified view of part A in the image;

[0028] Figure 7 This is a schematic diagram of the liquid inlet assembly structure of the present invention;

[0029] Figure 8 for Figure 7 A magnified view of part B in the image;

[0030] The components are as follows: 1. Drive mechanism; 2. Drill bit; 3. Drill rod; 4. Grouting mechanism; 5. Drill hole; 6. Support sleeve; 11. Drilling motor; 12. Platform; 13. Guide rail; 14. Support block; 15. Propulsion motor; 16. Propulsion screw; 17. Propulsion block; 21. Guide head; 22. First through hole; 23. Central tube; 24. Reamer blade; 25. Breaking block; 26. Connecting groove; 27. Keyway; 28. Connecting key; 31. First rod; 32. Intermediate rod; 33. Glue injection hole; 34. Tail rod. 35. Connector; 36. Intermediate joint; 37. Intermediate groove; 38. Check valve; 39. Fixing cover; 310. Connecting hole; 311. Injection plate; 312. Second spring; 313. Spiral guide vane; 314. Glue passage hole; 315. Glue plugging rod; 316. Positioning cylinder; 41. Liquid inlet tank; 42. Sealed bearing; 43. Liquid inlet hole; 44. Fixing screen; 45. Sealing block; 46. Telescopic rod; 47. First spring; 48. Liquid storage tank; 49. Liquid inlet pump; 410. Liquid inlet pipe. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] Reference Figure 1-8 This invention provides a drilling tool for injecting gel for fire prevention and extinguishing in coal mines, comprising:

[0034] Drive mechanism 1, which is used to drive the drill bit to drill out of the borehole 5;

[0035] Drill bit 2 is used to break the coal seam and drill a borehole 5. Drill bit 2 includes a borehole reaming assembly. One end of the borehole reaming assembly is equipped with a guide head 21. The borehole reaming assembly is hollow and communicates with the outside through several first through holes 22.

[0036] The drill rod 3 includes a first rod 31 that is connected to the drive mechanism 1. Several intermediate rods 32 are detachably connected to the end of the first rod 31 away from the drive mechanism 1. The intermediate rods 32 are located inside the drill hole 5 and communicate with the drill hole 5 through several glue injection holes 33. The tail rod 34 is detachably connected to the intermediate rod 32 at the tail end. The tail rod 34 is fixedly connected to and communicates with the end of the hole reaming assembly away from the guide head 21. An anti-clogging component is provided in the glue injection hole 33.

[0037] Grouting mechanism 4 includes a liquid inlet assembly rotatably sleeved outside the first rod 31, which is connected to the inner cavity of the first rod 31; the liquid inlet assembly is connected to a liquid storage assembly.

[0038] This invention discloses a drilling tool for injecting fire-resistant gel in coal mines. It is mainly used to inject fire-resistant gel into loose coal seams to prevent spontaneous combustion and reduce underground hazards. A drive mechanism 1 provides power for drilling. The drill bit 2 rotates under the drive mechanism 1. The guide head 21 is conical and used to pierce the coal seam ahead. The reaming assembly enlarges the borehole 5 during rotation, facilitating subsequent gel injection. A first through-hole 22 sprays cooling water outwards to reduce the temperature of the drill bit 2 and prevent high-temperature damage or ignition of the coal seam. The drill rod 3 transmits power from the drive mechanism 1 to the drill bit 2, including a head rod 31 that is connected to the drive mechanism 1. The tail rod 34 is connected to the drill bit 2 via a drive mechanism. Several intermediate rods 32 can be added between the head rod 31 and the tail rod 34 to allow the drill bit 2 to drill to a predetermined depth. The injection hole 33 on the outer wall of the intermediate rod 32 is used to inject gel into the borehole 5 and press it into the surrounding coal seam to isolate the coal seam and prevent spontaneous combustion. The anti-blocking component is used to prevent the injection hole 33 from being blocked during drilling and also has a one-way check function. The liquid inlet component of the grouting mechanism 4 is used to inject cooling water or fluid gel into the drill rod 3. The cooling water cools the drill bit 2 during drilling, and the gel is used to inject into the surrounding coal seam after drilling is completed. This is convenient and quick, and there is no need to install a grouting pipe separately after drilling is completed.

[0039] Furthermore, a support sleeve 6 is installed at the outlet of borehole 5 to support drill rod 3 and prevent gel from leaking from the outlet of borehole 5 during injection.

[0040] The further optimized design includes a reaming assembly comprising a central tube 23 installed at the end of the tail rod 34, a guide head 21 fixedly connected to the end of the central tube 23 away from the tail rod 34; a first through hole 22 penetrating through the outer wall of the central tube 23, and several reaming blades 24 fixedly connected to the outer wall of the central tube 23, with the first through hole 22 and the reaming blades 24 spaced apart; several fragments 25 fixedly connected to the end of the reaming blades 24 away from the central tube 23; a connecting groove 26 is provided at the end of the central tube 23 facing the tail rod 34, and a connector 35 adapted to the connecting groove 26 is fixedly connected to the tail rod 34, with the connecting groove 26 and the connector 35 threadedly connected; corresponding keyways 27 are provided on the connecting groove 26 and the connector 35, and a connecting key 28 is detachably connected in the keyway 27. The central tube 23 is used to circulate cooling water and gel and discharge them from the first through hole 22; the diameter of the reaming blade 24 gradually increases to prevent jamming; the break block 25 increases the cutting ability of the reaming blade 24; the connecting groove 26 and the connecting head 35 are threaded together and reinforced by the connecting key 28 to prevent the drill bit 2 from rotating during drilling and causing it to separate from the tail rod 34.

[0041] The design is further optimized by incorporating a hollow intermediate rod 32. One end of the intermediate rod 32 is fixedly connected to an intermediate connector 36, and the other end is fixedly connected to an intermediate groove 37. The intermediate connector 36 and the intermediate groove 37 are compatible. The end of the first rod 31 furthest from the drive mechanism 1 is fixedly connected to the intermediate connector 36, and the end of the tail rod 34 facing the drive mechanism 1 is fixedly connected to the intermediate groove 37. The two ends of the intermediate rod 32 are connected via the intermediate connector 36 and the intermediate groove 37, offering good interchangeability and allowing for arbitrary addition or removal as needed.

[0042] The design has been further optimized by installing a one-way valve 38 inside the intermediate rod 32. All one-way valves 38 open in one direction towards the intermediate connector 36. The one-way valves 38 can only open towards the drill bit 2 to prevent backflow of cooling water and gel.

[0043] The solution is further optimized. The liquid inlet assembly includes a liquid inlet tank 41 that is rotatably sleeved outside the first rod 31. The inlet of the liquid inlet tank 41 is connected to the liquid storage assembly. A sealed bearing 42 is provided between the side wall of the liquid inlet tank 41 and the first rod 31. The portion of the first rod 31 located inside the liquid inlet tank 41 has several liquid inlet holes 43. The liquid inlet holes 43 are connected to the inner cavity of the first rod 31. A one-way assembly is provided inside the liquid inlet holes 43. The one-way assembly includes a fixed screen 44 and a blocking block 45 respectively located at both ends of the liquid inlet holes 43. The blocking block 45 is located in the inner cavity of the first rod 31 and is detachably connected to the liquid inlet holes 43. The fixed screen 44 is fixedly connected to the inner cavity of the liquid inlet holes 43. A telescopic rod 46 is fixedly connected between the blocking block 45 and the fixed screen 44. A first spring 47 is sleeved on the telescopic rod 46. The two ends of the first spring 47 are fixedly connected to the fixed screen 44 and the blocking block 45 respectively. The liquid storage assembly pumps cooling water or gel into the inlet tank 41 and fills it. After passing through the fixed screen 44, the cooling water or gel enters the inlet hole 43, which applies pressure to the sealing block 45 and pushes the sealing block 45 away from the inlet hole 43, so that the cooling water and gel can enter the inner cavity of the first rod 31. The sealing block 45 is conical, with its large diameter end larger than the diameter of the inlet hole 43 and its small diameter end smaller than the diameter of the inlet hole 43. The first spring 47 and the telescopic rod 46 are used to reset the sealing block 45 after the cooling water supply is interrupted and the gel supply is interrupted.

[0044] Furthermore, the liquid storage assembly includes a liquid storage tank 48, which is used to hold cooling water or gel; the liquid storage tank 48 is connected to an inlet pump 49, and the outlet of the inlet pump 49 is connected to the inlet tank 41 through an inlet pipe 410; the pressure of the inlet pump 49 is adjustable.

[0045] The solution is further optimized. The anti-clogging component includes a fixed cover 39 fixedly connected to the inner cavity of the intermediate rod 32. The fixed cover 39 is correspondingly set with the glue injection hole 33. The fixed cover 39 has several connecting holes 310. A glue injection plate 311 is slidably connected to the end of the glue injection hole 33 near the fixed cover 39. A second spring 312 is fixedly connected between the glue injection plate 311 and the fixed cover 39. A spiral guide plate 313 is fixedly connected inside the glue injection hole 33. The spiral guide plate 313 is located at the end of the glue injection hole 33 away from the fixed cover 39. Several glue passage holes 314 are opened through the glue injection plate 311. A glue-blocking rod 315 corresponding to the several glue passage holes 314 is fixedly connected to the fixed cover 39. The glue-blocking rod 315 and the glue passage holes 314 are detachably connected and interference-fitted. The supply pressure of the cooling water is less than the injection pressure of the gel, so the second spring 312 cannot be pushed open to discharge the cooling water. The spiral guide plate 313 in the injection hole 33 can prevent external debris from entering the injection hole 33 and causing blockage during rotation. When the gel is injected, the gel enters the fixed cover 39 and pushes the injection plate 311 to slide away from the fixed cover 39. The plugging rod 315 separates from the glue passage hole 314 and connects the inside and outside. The gel enters the injection hole 33 from the glue passage hole 314 and is discharged into the drill hole 5 under the pressure along the spiral guide plate 313 and diffuses to the surroundings.

[0046] Furthermore, a positioning cylinder 316 is fixedly connected inside the glue injection hole 33. The inner cavity of the positioning cylinder 316 is adapted to the spiral guide plate 313. The outer diameter of the glue injection plate 311 is larger than the inner diameter of the positioning cylinder 316 and is detachably connected to the positioning cylinder 316, serving as the limiting point of the glue injection plate 311.

[0047] In a further optimized design, the drive mechanism 1 includes a propulsion assembly, which is connected to a drilling motor 11. The output shaft of the drilling motor 11 is connected to the lead rod 31. The propulsion assembly drives the drilling motor 11 to move towards the borehole 5, providing forward propulsion. The drilling motor 11 drives the drill bit 2 to rotate, thus drilling.

[0048] Furthermore, the propulsion assembly includes a platform 12, on which a guide rail 13 is mounted. Support blocks 14 are mounted at both ends of the guide rail 13, and a propulsion screw 16 is rotatably connected between the two support blocks 14. A propulsion block 17 is mounted on the screw and is slidably connected to the guide rail 13. The drilling motor 11 and the fluid inlet tank 41 are both mounted on the propulsion block 17. One end of the propulsion screw 16 is drivenly connected to a propulsion motor 15, which is mounted on the corresponding support block 14.

[0049] Furthermore, the first rod 31 is slidably connected to the support block 14.

[0050] How to use:

[0051] The platform 12 is installed underground in the coal mine, and then cooling water is filled into the storage tank 48. The drill bit 2 is first installed on the tail rod 34, and then the tail rod 34 is connected to the head rod 31. Then the guide head 21 is pressed against the coal seam, the drilling motor 11 is started to make the drill bit 2 rotate stably, and then the propulsion motor 15 is started to propel the drill bit 2 forward. During the drilling process, the cooling water in the storage tank 48 is pumped into the inlet tank 41 and sprayed out from the first through hole 22 of the drill bit 2 for cooling.

[0052] After drilling a certain distance, the advance is stopped, and the first rod 31 and the tail rod 34 are separated. The first rod 31 and the drilling motor 11 are moved backward, and an intermediate rod 32 is added between the first rod 31 and the tail rod 34. Then the drilling motor 11 and the advance motor 15 are restarted, and the drilling process is repeated. An intermediate rod 32 is added every time the drilling distance is reached, until the borehole 5 reaches the predetermined depth, and then the drilling is stopped.

[0053] Replace the cooling water in the storage tank 48 with gel, then restart the inlet pump 49 and increase the pressure so that the inlet pressure is greater than the deformation pressure of the second spring 312. The gel pushes open the injection plate 311 and enters the drill hole 5, and spreads from the drill hole 5 to the surrounding area to achieve the purpose of fire prevention.

[0054] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0055] The above embodiments are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A drilling tool for injecting gel for fire prevention and extinguishing in coal mines, characterized in that, include: Drive mechanism (1), which is used to drive the drill bit to drill out of the borehole (5); The drill bit (2) is used to break the coal seam and drill the borehole (5). The drill bit (2) includes a hole-reaming assembly. One end of the hole-reaming assembly is equipped with a guide head (21). The hole-reaming assembly is hollow and communicates with the outside through a number of first through holes (22). The drill rod (3) includes a head rod (31) that is connected to the drive mechanism (1) in a transmission manner. A number of intermediate rods (32) are detachably connected to the end of the head rod (31) away from the drive mechanism (1). The intermediate rods (32) are located in the drill hole (5) and communicate with the drill hole (5) through a number of glue injection holes (33). The tail rod (34) of the intermediate rod (32) at the tail end is detachably connected to the tail rod (34). The tail rod (34) is fixedly connected to and communicates with the end of the hole enlarging assembly away from the guide head (21). An anti-clogging component is provided in the glue injection hole (33). Grouting mechanism (4), the grouting mechanism (4) includes a liquid inlet assembly rotatably sleeved outside the first rod (31), the liquid inlet assembly is connected to the inner cavity of the first rod (31); the liquid inlet assembly is connected to a liquid storage assembly; the liquid inlet assembly of the grouting mechanism (4) is used to inject cooling water or fluid gel into the drill rod (3), the cooling water cools the drill bit (2) during drilling, and the gel is used to inject into the surrounding coal seam after drilling is completed, without the need to install a grouting pipe separately after drilling is completed; The reaming assembly includes a central tube (23) installed at the end of the tail rod (34), and a guide head (21) fixed to the end of the central tube (23) away from the tail rod (34); a first through hole (22) is formed through the outer wall of the central tube (23), and a plurality of reaming blades (24) are fixed to the outer wall of the central tube (23), with the first through hole (22) and the reaming blades (24) spaced apart; a plurality of fragments (25) are fixed to the end of the reaming blades (24) away from the central tube (23). The intermediate rod (32) is hollow; one end of the intermediate rod (32) is fixedly connected to an intermediate connector (36), and the other end of the intermediate rod (32) is fixedly connected to an intermediate groove (37); the intermediate connector (36) and the intermediate groove (37) are adapted to each other; the end of the first rod (31) away from the drive mechanism (1) is fixedly connected to the intermediate connector (36), and the end of the tail rod (34) facing the drive mechanism (1) is fixedly connected to the intermediate groove (37). The anti-clogging component includes a fixed cover (39) fixedly connected to the inner cavity of the intermediate rod (32), the fixed cover (39) being correspondingly provided with the glue injection hole (33), and the fixed cover (39) having a plurality of connecting holes (310); a glue injection plate (311) is slidably connected to one end of the glue injection hole (33) near the fixed cover (39), and a second spring (312) is fixedly connected between the glue injection plate (311) and the fixed cover (39); a spiral guide plate (313) is fixedly connected inside the glue injection hole (33), and the spiral guide plate (313) is located at the end of the glue injection hole (33) away from the fixed cover (39); The glue injection plate (311) has several glue passage holes (314) through it. The fixing cover (39) is fixedly connected with glue blocking rods (315) that correspond to the several glue passage holes (314). The glue blocking rods (315) are detachably connected to the glue passage holes (314) and are interference fit.

2. The drilling tool for injecting gel for fire prevention and extinguishing in coal mines according to claim 1, characterized in that: The central tube (23) has a connecting groove (26) at one end facing the tail rod (34). A connector (35) adapted to the connecting groove (26) is fixedly connected to the tail rod (34). The connecting groove (26) and the connector (35) are threadedly connected. The connecting groove (26) and the connector (35) are respectively provided with corresponding keyways (27). A connecting key (28) is detachably connected in the keyway (27).

3. The drilling tool for injecting gel for fire prevention and extinguishing in coal mines according to claim 1, characterized in that: The inner cavity of the intermediate rod (32) is equipped with a one-way valve (38), and the one-way valve (38) opens in one direction towards the intermediate joint (36).

4. The drilling tool for injecting gel for fire prevention and extinguishing in coal mines according to claim 1, characterized in that: The liquid inlet assembly includes a liquid inlet tank (41) rotatably sleeved outside the first rod (31), the inlet of the liquid inlet tank (41) being connected to the liquid storage assembly; a sealed bearing (42) is provided between the side wall of the liquid inlet tank (41) and the first rod (31); the portion of the first rod (31) located inside the liquid inlet tank (41) is provided with a plurality of liquid inlet holes (43), the liquid inlet holes (43) being connected to the inner cavity of the first rod (31), and a one-way component is provided inside the liquid inlet holes (43).

5. The drilling tool for injecting gel for fire prevention and extinguishing in coal mines according to claim 4, characterized in that: The unidirectional component includes a fixed screen (44) and a blocking block (45) respectively disposed at both ends of the liquid inlet (43). The blocking block (45) is located in the inner cavity of the first rod (31) and is detachably connected to the liquid inlet (43). The fixed screen (44) is fixedly connected to the inner cavity of the liquid inlet (43). A telescopic rod (46) is fixedly connected between the blocking block (45) and the fixed screen (44). A first spring (47) is sleeved on the telescopic rod (46). The two ends of the first spring (47) are fixedly connected to the fixed screen (44) and the blocking block (45) respectively.

6. The drilling tool for injecting gel for fire prevention and extinguishing in coal mines according to claim 1, characterized in that: The drive mechanism (1) includes a propulsion assembly, which is driven by a drilling motor (11), and the output shaft of the drilling motor (11) is driven by the head rod (31).

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