Drill rod for coal mining

Abstract

The invention discloses a drill rod for coal mining, and particularly relates to the field of drill rods, the drill rod comprises a main rod, the two ends of the main rod are symmetrically and fixedly connected with connecting columns, one end of each connecting column is provided with a plurality of first through holes, the middle of each connecting column is provided with a fixing hole, the middle of each connecting column is sleeved with a sealing gasket, and the two ends of the main rod are symmetrically provided with connecting seats. The connecting bases are arranged between the main rod and the female connector and between the main rod and the male connector, so that the female connector and the male connector can be connected with the main rod through the connecting bases, the connecting bases can be independently replaced when the connecting bases are damaged, the connecting bases can be independently replaced when any one of the female connector and the male connector is damaged, the replacement cost is reduced, and the replacement time is shortened; and a first threaded rod penetrates through a fixing hole to stably connect the connecting base with the main rod, and an extrusion stud extrudes a first fixing clamping groove, so that the rotation loosening resistance of the connecting block can be increased, the connecting strength is improved, and the effect of preventing loosening and falling is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of drill rods, and more particularly to a drill rod used for coal mining. Background Art

[0002] A drill pipe is a steel pipe with a threaded tail end, used to connect the surface equipment of a drilling rig and the drilling and grinding equipment or bottom hole device at the bottom of the well. In coal mining operations, the drill pipe is a key tool for drilling construction. It connects the various components through the tail thread and plays an important role in transmitting torque and axial force during drilling construction. Its performance directly affects mining efficiency and operational safety.

[0003] Traditional drill pipes mostly use simple threaded connections. In the complex operating environment of coal mines, such as high vibration and high torque conditions, the friction between the threads decreases over time, making them prone to loosening. In extreme situations such as sudden changes in rock hardness, the sudden excessive torque can cause thread stripping, which can lead to the drill pipe falling off. This not only interrupts drilling operations, increases maintenance costs and time, but can also cause safety accidents and threaten the lives of underground workers.

[0004] Furthermore, over long periods of operation, threaded connections are susceptible to damage due to wear and corrosion. It's impossible to replace damaged sections individually, forcing the entire drill rod to be scrapped and replaced with a new one. This not only results in significant material waste and increases equipment costs for coal mining, but frequent drill rod replacement also further prolongs downtime, severely impacting the continuity and production progress of coal mining. Therefore, a drill rod for coal mining is proposed. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a drill rod for coal mining to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a drill rod for coal mining, comprising a main rod, wherein both ends of the main rod are symmetrically fixedly connected with connecting columns, one end of the connecting column is provided with a plurality of first through holes, through which liquid is facilitated to circulate, thereby sequentially flowing into the interior of the drill bit through hole to cool and moisten the drill bit during operation, a fixing hole is provided in the middle of the connecting column, and the fixing hole is conveniently connected to the connecting seat via a first threaded rod to achieve a fixed connection between the main rod and the connecting seat, a sealing gasket is sleeved in the middle of the connecting column, and the sealing gasket is squeezed during connection to improve the sealing performance of the connection;

[0007] The two ends of the main rod are symmetrically provided with connecting seats, which facilitate indirect connection of the main rod with the female joint and the male joint through the connecting seats, avoiding the situation where the direct connection is damaged and cannot be replaced, resulting in waste of materials. The two ends of the connecting seat are respectively provided with connecting holes and threaded grooves, and the two sides of one end of the connecting seat are provided with rotation auxiliary flat grooves, which facilitate external tools to be clamped on the connecting seat to rotate the connecting seat, so that it can be rotated when combined and connected. A first threaded rod is inserted in the middle of the rotation auxiliary flat groove, which is convenient for connection with the connecting column through the connecting hole. The connecting column is fixed in the middle of the connecting hole by the first threaded rod passing through the fixing hole, which is convenient for connection and disassembly.

[0008] A female connector and a male connector are respectively provided on opposite sides of the two connecting seats, and fastening mechanisms are provided between the connecting seat and the female connector and the male connector. A combined fixing mechanism is provided on the opposite ends of the female connector and the male connector. Through the provided fastening mechanism, it is convenient to connect the connecting seat and the female connector and the male connector, and improve the connection strength. It can be selected whether to install and use according to actual needs. Through the combined fixing mechanism, when multiple main rods are combined, the female connector and the male connector can be combined and connected to increase the overall length and connection reliability.

[0009] In a preferred embodiment, positioning slots are symmetrically provided on both sides of the connecting column, and positioning strips are symmetrically fixedly connected on both sides of the middle of the connecting hole. The positioning strips and the positioning slots are adapted to each other, and the positioning strips are provided in the middle of the positioning slots. The positioning strips are embedded in the positioning slots to play a positioning and guiding role, thereby ensuring that the connecting seat and the connecting column are accurately aligned, thereby improving the connection accuracy and stability.

[0010] In a preferred embodiment, the first threaded rod corresponds to the fixing hole, the first threaded rod passes through the middle of the fixing hole, the first through hole, the fixing hole and the positioning slot are staggered with each other, and the first threaded rod passes through the middle of the fixing hole, which facilitates the connection between the connecting column and the main rod, and facilitates connection and disassembly for replacement and use.

[0011] In a preferred embodiment, a screw head groove and a nut groove are respectively provided in the middle of the two rotation-assisting flat grooves, the screw head at one end of the first threaded rod is located in the middle of the screw head groove, and a nut is sleeved on one end of the first threaded rod, and the nut is arranged in the middle of the nut groove. The nut groove is adapted to the nut, and the screw head and nut of the first threaded rod are respectively accommodated through the screw head groove and the nut groove to prevent axial movement, while also protecting the screw head and nut from external impact and wear.

[0012] In a preferred embodiment, the fastening mechanism includes a connecting block fixed on the opposite side of the female connector and the male connector, the connecting block is adapted to the thread groove, a second fixing groove is provided on one side of the inner cavity of the thread groove, a first sealing ring is provided in the middle of the thread groove, and an extrusion stud is threadedly inserted around one end of the connecting seat close to the thread groove.

[0013] In a preferred embodiment, the connecting block is arranged in the middle of the thread groove, the connecting block is threadedly connected to the thread groove, one end of the first sealing ring is fixedly connected to a fixing clamping ring, and the fixing clamping ring is embedded in the middle of the second fixing clamping groove.

[0014] In a preferred embodiment, one end of the connecting block is provided with a first fixing slot, one side wall of the inner cavity of the first fixing slot is set as an inclined surface, the inclined surface is located on the side of the connecting block away from the connecting seat, one end of the extruded stud is set as a semicircular structure, and the other end is provided with an inner hexagonal groove, one end of the extruded stud is fitted with the inner cavity inclined surface of the first fixing slot, the connecting block is spirally rotated in the middle of the threaded groove for connection until the first fixing slot corresponds to the extruded stud, and then the extruded stud is tightened so that the semicircular end of the extruded stud squeezes the inclined surface of the first fixing slot, which can The axial force is converted into radial tightening force, which can fix the position of the connecting block, further tighten the connecting block in the thread groove, prevent loosening, and enhance the reliability of the connection. By squeezing the first sealing ring, the sealing of the connection can be improved, effectively preventing liquids, gases and other media from entering the connection part, and playing a good sealing role. Through the cooperation of the set fixing clamping ring and the second fixing clamping groove, the first sealing ring can be positioned, which is convenient for installation of the first sealing ring to avoid falling. The hexagonal groove set at one end of the extrusion stud can be used to facilitate operation with a hexagonal wrench, which is convenient for installation and disassembly.

[0015] In a preferred embodiment, the combined fixing mechanism includes a female connecting groove opened at the end of the female connector away from the connecting block, a second threaded rod is threadedly inserted around the female connector, and a male connecting plug is fixedly connected to the end of the male connector away from the connecting block, and a second through hole is opened in the middle of the female connecting groove and the male connecting plug.

[0016] In a preferred embodiment, the male plug is adapted to the female groove, the male plug is threadedly connected to the inner cavity of the female groove, the second through hole passes through the middle of the connecting block, fixing grooves are symmetrically provided on both sides of one end of the male plug, and an embedding groove is provided in the middle of the female groove.

[0017] In a preferred embodiment, a second sealing ring is provided in the middle of the female groove, and one end of the second threaded rod is rotatably connected to an extrusion block, and the extrusion block corresponds to the fixed groove. The extrusion block is arranged in the middle of the fixed groove, and one side of the second sealing ring is fixedly connected to an embedded ring, which is arranged inside the embedded groove. When connected, the male plug is threadedly inserted into the female groove to squeeze the second sealing ring, which can effectively seal the connection part between the female connector and the male connector to prevent liquid and gas leakage, and realize preliminary positioning connection so that the extrusion block corresponds to the fixed groove. The second threaded rod can be rotated to control the extrusion block to gradually embed into the interior of the fixed groove, and a tightening force is applied to the female connector and the male connector to make the two tightly connected to prevent loosening during drilling operations. The installation limit of the second sealing ring can be fixed by cooperating with the embedded ring and the embedded groove to avoid falling and losing and affecting the sealing.

[0018] Technical effects and advantages of the present invention:

[0019] 1. The present invention firstly provides a connecting seat between the main rod and the female joint and the male joint, so that the female joint and the male joint can be connected to the main rod through the connecting seat. When the connecting seat is damaged, the connecting seat can be replaced separately. When either the female joint or the male joint is damaged, it can be replaced separately, which reduces replacement cost and replacement time and avoids material waste. In addition, the connecting seat is stably connected to the main rod by the first threaded rod passing through the fixing hole. By squeezing the first fixing slot with the extrusion stud, the resistance to rotation loosening of the connection block can be increased, the connection strength is improved, and the loosening and falling-off prevention function is played.

[0020] 2. The present invention also facilitates the rotation operation during the combined connection by providing a rotation auxiliary flat groove, and improves the sealing strength of the connection between the connecting seat and the main rod by squeezing the sealing gasket. The connecting block squeezes the first sealing ring to improve the sealing strength of the connection between the female connector, the male connector and the connecting seat, which can effectively prevent external liquids, gases and other media from entering the connection parts, meet the sealing requirements of various complex working environments in coal mines, and improve the use effect;

[0021] 3. The present invention also facilitates the positioning of the assembled connection seat through the cooperation of the positioning card strip and the positioning card slot. By threading the male plug with the female groove and rotating the second threaded rod to control the extrusion block to snap into the interior of the fixed groove, the connection of the male plug can be limited, thereby improving the connection strength and preventing the connection from loosening. In addition, by squeezing the second sealing ring and cooperating with the second through hole, a communication sealing effect can be achieved when the two main rods are assembled and connected.

[0022] In summary, through the mutual influence of the above-mentioned multiple effects, the connection can be replaced separately when it is damaged, reducing the replacement cost and replacement time, avoiding material waste, and at the same time increasing the rotational loosening resistance of the threaded connection, improving the connection strength, playing a role in preventing loosening and falling off, and improving the sealing strength after connection, making it convenient for combined use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0024] Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention.

[0025] Figure 3 It is a schematic diagram of the cross-sectional structure of the connection between the two main rods of the present invention.

[0026] Figure 4 It is a schematic diagram of the disassembled structure of the main rod and the connecting seat, the male connector and the female connector of the present invention.

[0027] Figure 5 It is a schematic diagram of the cross-sectional structure of the present invention.

[0028] Figure 6 For the present invention Figure 5 Schematic diagram of the locally enlarged structure at point A in the middle.

[0029] Figure 7 It is a schematic diagram of the split structure of the present invention.

[0030] The accompanying drawings are marked as follows: 1. main rod; 2. connecting column; 3. first through hole; 4. fixing hole; 5. sealing gasket; 6. connecting seat; 7. connecting hole; 8. rotation auxiliary flat groove; 9. first threaded rod; 10. first sealing ring; 11. extrusion stud; 12. female connector; 13. male connector; 14. connecting block; 15. first fixing slot; 16. positioning strip; 17. positioning slot; 18. screw head slot; 19. nut slot; 20. nut; 21. second fixing slot; 22. threaded groove; 23. fixing clamp; 24. female slot; 25. male plug; 26. second through hole; 27. second threaded rod; 28. extrusion block; 29. ​​second sealing ring; 30. fixing slot. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] As attached Figure 1-7A drill rod for coal mining shown in FIG. 1 includes a main rod 1, with connecting columns 2 symmetrically fixedly connected at both ends of the main rod 1. A plurality of first through-holes 3 are formed at one end of the connecting column 2, through which liquid can flow, thereby flowing into the drill bit through-hole in sequence to cool and moisten the drill bit during operation. A fixing hole 4 is formed in the middle of the connecting column 2. The fixing hole 4 facilitates connection with a connecting seat 6 via a first threaded rod 9, thereby achieving a fixed connection between the main rod 1 and the connecting seat 6. A sealing gasket 5 is sleeved in the middle of the connecting column 2, and the sealing gasket 5 can be squeezed during connection to improve the sealing performance of the connection.

[0033] Connecting seats 6 are symmetrically provided at both ends of the main rod 1, which facilitate indirect connection of the main rod 1 with the female connector 12 and the male connector 13 through the connecting seat 6, so as to avoid the situation where the direct connection is damaged and cannot be replaced, resulting in waste of materials. Connecting holes 7 and threaded grooves 22 are respectively provided at both ends of the connecting seat 6, and rotation auxiliary flat grooves 8 are provided on both sides of one end of the connecting seat 6. The rotation auxiliary flat grooves 8 facilitate external tools to be clamped on the connecting seat 6 to rotate the connecting seat 6, so that it can be rotated when combined and connected. A first threaded rod 9 is inserted in the middle of the rotation auxiliary flat groove 8, which is convenient for connection with the connecting column 2 through the connecting hole 7. The connecting column 2 is fixed in the middle of the connecting hole 7 by the first threaded rod 9 passing through the fixing hole 4, so as to facilitate connection and disassembly.

[0034] A female connector 12 and a male connector 13 are respectively provided on the opposite sides of the two connecting seats 6. A fastening mechanism is provided between the connecting seat 6 and the female connector 12 and the male connector 13. A combined fixing mechanism is provided on the opposite ends of the female connector 12 and the male connector 13. Through the provided fastening mechanism, it is convenient to connect the connecting seat 6 and the female connector 12 and the male connector 13, and improve the connection strength. It can be selected whether to install and use according to actual needs. Through the combined fixing mechanism, when multiple main rods 1 are combined, the female connector 12 and the male connector 13 can be used for combined connection to increase the overall length and connection reliability.

[0035] As attached Figure 2-7As shown, positioning slots 17 are symmetrically provided on both sides of the connecting column 2, and positioning strips 16 are symmetrically fixedly connected on both sides of the middle of the connecting hole 7. The positioning strips 16 and the positioning slots 17 are adapted to each other, and the positioning strips 16 are arranged in the middle of the positioning slots 17. The first threaded rod 9 corresponds to the fixing hole 4, and the first threaded rod 9 passes through the middle of the fixing hole 4. The first through hole 3 is staggered with the fixing hole 4 and the positioning slot 17. The middle of the two rotation auxiliary flat grooves 8 are respectively provided with a screw head groove 18 and a nut groove 19. The screw head at one end of the first threaded rod 9 is located in the middle of the screw head groove 18, and one end of the first threaded rod 9 is A nut 20 is provided, and the nut 20 is arranged in the middle of the nut groove 19. The nut groove 19 is adapted to the nut 20. The positioning strip 16 is embedded in the positioning slot 17 to play a positioning and guiding role, ensuring that the connecting seat and the connecting column are accurately aligned, improving the connection accuracy and stability. The first threaded rod 9 passes through the middle of the fixing hole 4, which is convenient for connecting the connecting column 2 and the main rod 1, and convenient for connection and disassembly and replacement. The screw head groove 18 and the nut groove 19 respectively accommodate the screw head and nut 20 of the first threaded rod 9 to prevent their axial movement, and at the same time protect the screw head and nut from external impact and wear.

[0036] As attached Figure 2-7As shown, the fastening mechanism includes a connecting block 14 fixed on the opposite side of the female connector 12 and the male connector 13, the connecting block 14 is adapted to the thread groove 22, and a second fixing groove 21 is provided on one side of the inner cavity of the thread groove 22, and a first sealing ring 10 is provided in the middle of the thread groove 22. An extrusion stud 11 is threadedly inserted around one end of the connecting seat 6 close to the thread groove 22, and the connecting block 14 is arranged in the middle of the thread groove 22. The connecting block 14 is threadedly connected to the thread groove 22, one end of the first sealing ring 10 is fixedly connected to a fixing clamp 23, and the fixing clamp 23 is embedded in the middle of the second fixing groove 21, and a first fixing groove 15 is provided at one end of the connecting block 14. A wall on one side of the inner cavity of the first fixing groove 15 is set as an inclined surface, and the inclined surface is located on the side of the connecting block 14 away from the connecting seat 6. One end of the extrusion stud 11 is set as a semicircular structure and the other end is provided with an inner hexagonal groove. One end of the extrusion stud 11 is aligned with the inner wall of the first fixing groove 15 The inclined surfaces of the cavities fit together, and the connecting block 14 is spirally rotated in the middle of the thread groove 22 to connect until the first fixing groove 15 corresponds to the extrusion stud 11, and then the extrusion stud 11 is tightened so that the semicircular end of the extrusion stud 11 squeezes the inclined surface of the first fixing groove 15, which can convert the axial force into a radial tightening force, and the position of the connecting block 14 can be fixed, so that the connecting block 14 is further tightened in the thread groove 22 to prevent loosening, thereby enhancing the reliability of the connection, and by squeezing the first sealing ring 10, the sealing of the connection can be improved, and liquid, gas and other media can be effectively prevented from entering the connection part, thereby playing a good sealing role. The first sealing ring 10 can be positioned by cooperating with the set fixing ring 23 and the second fixing groove 21, which facilitates the installation of the first sealing ring 10 and prevents it from falling. The hexagonal groove at one end of the extrusion stud 11 makes it convenient to use an hexagonal wrench for operation, which is convenient for installation and disassembly.

[0037] As attached Figure 2 、 3As shown in , 4, 5, and 7, the combined fixing mechanism includes a female groove 24 provided at one end of the female connector 12 away from the connecting block 14, a second threaded rod 27 is threadedly inserted around the female connector 12, and a male plug 25 is fixedly connected to the end of the male connector 13 away from the connecting block 14. A second through hole 26 is provided in the middle of the female groove 24 and the male plug 25, and the male plug 25 is adapted to the female groove 24. The male plug 25 is threadedly connected to the inner cavity of the female groove 24, and the second through hole 26 passes through the middle of the connecting block 14. Fixed grooves 30 are symmetrically provided on both sides of one end of the male plug 25, an embedded groove is provided in the middle of the female groove 24, and a second sealing ring 29 is provided in the middle of the female groove 24. One end of the second threaded rod 27 is rotatably connected to the extrusion block 28, and the extrusion block 28 is fixed to the fixed The fixed groove 30 corresponds to the extrusion block 28, which is arranged in the middle of the fixed groove 30. An embedded ring is fixedly connected to one side of the second sealing ring 29, and the embedded ring is arranged inside the embedded groove. When connected, the male plug 25 is threadedly inserted into the female groove 24 to squeeze the second sealing ring 29, which can effectively seal the connection between the female connector and the male connector to prevent liquid and gas leakage, and achieve preliminary positioning connection, so that the extrusion block 28 corresponds to the fixed groove 30. The extrusion block 28 can be controlled to gradually embed into the interior of the fixed groove 30 by rotating the second threaded rod 27, and a tightening force is applied to the female connector and the male connector to make the two tightly connected to prevent loosening during drilling operations. The installation limit of the second sealing ring 29 can be fixed by the cooperation of the embedded ring and the embedded groove to avoid falling and losing and affecting the sealing.

[0038] The working principle of the present invention is as follows: when in use, the connecting seat 6 is installed on both sides of the main rod 1, the connecting column 2 is inserted into the interior of the connecting hole 7, and the position of the connecting column 2 is limited by the positioning clip 16 and the positioning slot 17, so that the mounting hole of the first threaded rod 9 corresponds to the fixing hole 4, and then the first threaded rod 9 is inserted through the fixing hole 4 and the nut 20 is installed to tighten and fix it. At the same time, the sealing gasket 5 is squeezed to achieve sealing and fixing;

[0039] Insert the first sealing ring 10 into the second fixing groove 21 through the fixing collar 23 and fix it in the middle of the threaded groove 22. Rotate the connecting blocks 14 at one end of the female connector 12 and the male connector 13 and insert them into the middle of the threaded groove 22 of the two connecting seats 6 respectively until the first fixing groove 15 corresponds to the extrusion stud 11 when the first sealing ring 10 is squeezed. Then tighten the extrusion stud 11 with an Allen wrench so that the semicircular end of the extrusion stud 11 squeezes the inclined surface of the first fixing groove 15. Further tighten the connecting block 14 to enhance the connection strength, and complete the installation and fixation of the female connector 12 and the male connector 13.

[0040] When assembling multiple main rods 1, position the second sealing ring 29 in the middle of the female groove 24 through the embedding ring and the embedding groove. Then, align the female connector 12 with the male connector 13, and rotate the male connector 25 to insert it into the female groove 24 until the second sealing ring 29 is squeezed and the fixing groove 30 is aligned with the extrusion block 28. Then, rotate the second threaded rod 27 to make the extrusion block 28 fit into the fixing groove 30, and the assembly of the drill rod is completed.

[0041] The drill bit is threadedly connected to the female connector groove 24 inside the female connector 12 at one end, and the second threaded rod 27 is rotated to control the extrusion block 28 to extrude and fix it. The whole assembly is complete and easy to use.

[0042] The drawings of the embodiments disclosed in the present invention only involve structures related to the embodiments disclosed in the present invention. Other structures may refer to conventional designs. In the absence of conflicts, the same embodiment and different embodiments of the present invention may be combined with each other.

[0043] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A drill rod for coal mining, comprising a main rod (1), characterized in that: The two ends of the main rod (1) are symmetrically fixedly connected with connecting columns (2), one end of the connecting column (2) is provided with a plurality of first through holes (3), the middle of the connecting column (2) is provided with a fixing hole (4), and the middle of the connecting column (2) is sleeved with a sealing gasket (5); Connecting seats (6) are symmetrically provided at both ends of the main rod (1), connecting holes (7) and threaded grooves (22) are respectively provided at both ends of the connecting seat (6), rotation auxiliary flat grooves (8) are provided on both sides of one end of the connecting seat (6), and a first threaded rod (9) is inserted in the middle of the rotation auxiliary flat groove (8); A female connector (12) and a male connector (13) are respectively provided on opposite sides of the two connecting seats (6); a fastening mechanism is provided between the connecting seat (6) and the female connector (12) and the male connector (13); and a combined fixing mechanism is provided on opposite ends of the female connector (12) and the male connector (13).

2. A drill rod for coal mining according to claim 1, characterized in that: Positioning slots (17) are symmetrically provided on both sides of the connecting column (2), and positioning strips (16) are symmetrically fixedly connected to both sides of the middle of the connecting hole (7). The positioning strips (16) and the positioning slots (17) are adapted to each other, and the positioning strips (16) are arranged in the middle of the positioning slots (17).

3. The drill rod for coal mining according to claim 1, characterized in that: The first threaded rod (9) corresponds to the fixing hole (4), the first threaded rod (9) passes through the middle of the fixing hole (4), and the first through hole (3) is misaligned with the fixing hole (4) and the positioning slot (17).

4. The drill rod for coal mining according to claim 1, characterized in that: A screw head groove (18) and a nut groove (19) are respectively provided in the middle of the two rotation auxiliary flat grooves (8), a screw head at one end of the first threaded rod (9) is located in the middle of the screw head groove (18), a nut (20) is sleeved on one end of the first threaded rod (9), the nut (20) is arranged in the middle of the nut groove (19), and the nut groove (19) is adapted to the nut (20).

5. The drill rod for coal mining according to claim 1, characterized in that: The fastening mechanism comprises a connecting block (14) fixed on opposite sides of the female connector (12) and the male connector (13), the connecting block (14) being adapted to the thread groove (22), a second fixing groove (21) being provided on one side of the inner cavity of the thread groove (22), a first sealing ring (10) being provided in the middle of the thread groove (22), and an extrusion stud (11) being threadedly inserted around one end of the connecting seat (6) close to the thread groove (22).

6. The drill rod for coal mining according to claim 5, characterized in that: The connecting block (14) is arranged in the middle of the thread groove (22), and the connecting block (14) is threadedly connected to the thread groove (22). One end of the first sealing ring (10) is fixedly connected to a fixed clamping ring (23), and the fixed clamping ring (23) is embedded in the middle of the second fixed clamping groove (21).

7. The drill rod for coal mining according to claim 5, characterized in that: One end of the connecting block (14) is provided with a first fixing slot (15), and a wall on one side of the inner cavity of the first fixing slot (15) is provided with an inclined surface, and the inclined surface is located on the side of the connecting block (14) away from the connecting seat (6). One end of the extruded stud (11) is provided with a semicircular structure, and the other end is provided with an inner hexagonal slot, and one end of the extruded stud (11) is in contact with the inner cavity inclined surface of the first fixing slot (15).

8. The drill rod for coal mining according to claim 1, characterized in that: The combined fixing mechanism comprises a female connection groove (24) provided at one end of the female connector (12) away from the connection block (14), a second threaded rod (27) being threadedly inserted around the periphery of the female connector (12), a male connection plug (25) being fixedly connected to one end of the male connector (13) away from the connection block (14), and a second through hole (26) being provided in the middle of both the female connection groove (24) and the male connection plug (25).

9. The drill rod for coal mining according to claim 8, characterized in that: The male connector (25) is adapted to the female connector groove (24), and the male connector (25) is threadedly connected to the inner cavity of the female connector groove (24). The second through hole (26) passes through the middle of the connecting block (14). Fixing grooves (30) are symmetrically provided on both sides of one end of the male connector (25), and an embedding groove is provided in the middle of the female connector groove (24).

10. The drill rod for coal mining according to claim 8, characterized in that: A second sealing ring (29) is provided in the middle of the female groove (24), one end of the second threaded rod (27) is rotatably connected to an extrusion block (28), the extrusion block (28) corresponds to the fixed groove (30), the extrusion block (28) is provided in the middle of the fixed groove (30), and one side of the second sealing ring (29) is fixedly connected to an embedded ring, which is provided inside the embedded groove.

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