Special drill bit for mine drilling

Abstract

The utility model relates to the technical field of drill bits, in particular to a special drill bit for mine drilling, which comprises a drilling machine mounting seat, a semicircular groove is arranged at the bottom of the outer wall of the drilling machine mounting seat, two first rectangular movable grooves are arranged on the rear side of the inner wall of the semicircular groove, and a semicircular fixing block is arranged in the semicircular groove. Two second rectangular movable grooves are formed in the rear side of the semicircular fixing block, a drill bit body is arranged at the bottom of the drilling machine mounting base, a butt joint column is arranged in the middle of the top of the drill bit body, and a fixing piece used for positioning the butt joint column is arranged between the first rectangular movable groove and the second rectangular movable groove which are oppositely arranged front and back. According to the special drill bit for mine drilling, the first semicircular butt-joint groove and the second semicircular butt-joint groove are formed and used in cooperation with the butt-joint column at the top of the drill bit body, reliable butt joint of the drill bit body and the drilling machine installation base is achieved, meanwhile, the butt-joint column is further locked through the fixing piece, and the drill bit is effectively prevented from loosening or disengaging in the operation process; and the stability of drill bit connection is improved.

Description

Technical Field

[0001] This utility model relates to the field of drill bit technology, specifically a drill bit for mining drilling. Background Technology

[0002] Mining drill bits are indispensable tools in mining, geological exploration, and engineering construction. Their main function is to drill holes in rock through rotational cutting or impact to meet blasting, ventilation, drainage, or other engineering needs. Depending on the specific requirements of drilling operations, mining drill bits come in various types and structures, with common types including roller cone bits, carbide bits, and PDC bits.

[0003] Patent CN220815575U discloses a high-precision positioning mining drill bit, including a mounting base and a connecting base. The mining drill bit body is fixedly installed at the bottom of the connecting base. The mounting base is movably installed inside the connecting base. Two sets of uprights are fixedly installed at the top of the mounting base. The same set of long rods are slidably installed on the outer side of the two sets of uprights. Two sets of inclined rods are movably installed inside the long rods. Slide plates are fixedly installed at the bottom of the two sets of inclined rods. Insert plates are fixedly installed on one side of each of the two sets of slide plates. Both the insert plates and slide plates are slidably installed inside the mounting base. Both sets of insert plates are movably inserted into the inside of the connecting base. This design enables very convenient replacement of the mining drill bit body, effectively reduces vibration of the mining drill bit body, reduces damage to the mining drill bit body, increases the practicality of the device, and improves the efficiency of replacing the mining drill bit body.

[0004] In the aforementioned prior art, pulling the long rod upwards causes the two sets of inclined rods inside the rod to move their bottom sliding plates closer together, thereby pulling the insert plate out of the connecting seat. Subsequently, the mounting seat detaches from the connecting seat at the top of the mining drill bit body, facilitating the replacement of different mining drill bit bodies. However, in actual use, some defects and shortcomings still exist. First, the drill bit generates a large amount of gravel during drilling operations in the mine. This gravel moves in the opposite direction of the drill bit's movement and easily enters the through groove at the top of the mounting seat for the inclined rods and sliding plates to move, thus reducing the installation space of the spring three inside the mounting seat. When the drill bit is blocked by gravel, the spring cannot be compressed properly, which affects the insertion and removal of the insert plate. This prevents the drill bit from separating smoothly from the mounting base. Furthermore, the movement of gravel may cause the long rod to shift unexpectedly, causing the insert plate to accidentally move out of the square groove of the connecting base, resulting in abnormal separation between the drill bit and the mounting base. This not only affects the normal progress of drilling operations but may also cause safety hazards such as the drill bit falling off. Therefore, although the above-mentioned existing technology has improved the convenience of drill bit replacement to a certain extent, problems such as gravel blockage and accidental separation still exist under complex working conditions. In view of this, we propose a drill bit specifically for mining drilling. Utility Model Content

[0005] The purpose of this utility model is to provide a drill bit specifically for mining drilling to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A special drill bit for mining drilling includes a drill rig mounting base, which is the part of the mining drill rig used to connect the drill bit. The bottom of the outer wall of the drill rig mounting base is provided with a semi-circular groove to provide space for accommodating a semi-circular fixed block and a docking post. A semi-circular first docking groove is vertically provided in the middle of the rear side of the inner wall of the semi-circular groove, which, together with the semi-circular second docking groove, is used to accommodate the docking post, so as to realize the docking and fixing of the drill bit body.

[0008] The rear side of the inner wall of the semi-circular groove has two first rectangular movable grooves arranged symmetrically to provide sliding space for the fixing block in the fastener. The left and right sides of the rear side of the inner wall of the semi-circular groove are provided with first U-shaped grooves to provide guidance for the sliding of the rectangular tie rod.

[0009] The semi-circular groove contains a detachable semi-circular fixed block for connecting the docking column together with the drilling rig mounting base. A semi-circular second docking groove is vertically opened in the middle of the rear side of the semi-circular fixed block, which cooperates with the semi-circular first docking groove to accommodate the docking column. Two second rectangular movable grooves are opened on the rear side of the semi-circular fixed block in a left-right symmetrical arrangement to provide sliding space for the fixed insert in the fixing component, which cooperates with the first rectangular movable groove. Second U-shaped grooves are opened on both the left and right sides of the rear side of the semi-circular fixed block to provide guidance for the sliding of the rectangular tie rod, which cooperates with the first U-shaped groove.

[0010] The bottom of the drilling rig mounting base is provided with a drill bit body, and the top center of the drill bit body is provided with a docking post. The docking post is located between a semi-circular first docking groove and a semi-circular second docking groove. The docking post is embedded between the semi-circular first docking groove and the semi-circular second docking groove to realize the docking of the drill bit body and the drilling rig mounting base. A fixing member is provided between the first rectangular movable groove and the second rectangular movable groove, which are arranged in opposite directions, to lock and fix the docking post and release the positioning.

[0011] Preferably, the fixing component includes a rectangular tie rod. A fixing block is provided at one end of the rectangular tie rod near the semi-circular first docking groove. The bottom of the fixing block on the side away from the rectangular tie rod has a beveled surface to facilitate resistance during docking and ensure smooth insertion. Two symmetrically arranged fixing slots are provided on the outer wall of the docking post. The fixing blocks of the two fixing components are respectively inserted into the two fixing slots. When the two fixing blocks are respectively inserted into the two fixing slots, the docking post can be fixed between the first and second rectangular movable grooves, enabling quick connection of the drill bit. When the two fixing blocks are removed from the two fixing slots, the fixing of the docking post can be released, thereby enabling quick disassembly of the drill bit, facilitating rapid drill bit replacement by the operator.

[0012] Preferably, the fixed plug is slidably connected between the first rectangular movable groove and the second rectangular movable groove arranged opposite to each other, and the rectangular pull rod is slidably connected between the first U-shaped groove and the second U-shaped groove arranged opposite to each other, which is used to drive the fixed plug to slide into or out of the fixed slot.

[0013] Preferably, the outer wall of the rectangular pull rod has two finger grooves arranged symmetrically front to back near its outer end. The outer end of the rectangular pull rod is located outside the drilling rig mounting base, so that the operator can pull the rectangular pull rod outward, thereby causing the rectangular pull rod to move the fixed plug block and move the fixed plug block out of the fixed slot. The outer wall of the rectangular pull rod is fitted with a spring. One end of the spring abuts against the side of the fixed plug block, and the end of the spring away from the fixed plug block abuts against the end face of the inner wall of the first rectangular movable groove and the second rectangular movable groove arranged front to back. The spring is used to provide a rebound force to ensure that the fixed plug block is always tightly inserted into the fixed slot.

[0014] Preferably, the fixing component further includes a frame-shaped rubber block, through which the rectangular pull rod passes, and the outer wall of the rectangular pull rod is tightly fitted with the inner wall of the frame-shaped rubber block to provide a sealing effect, preventing particles from entering the first rectangular movable groove and the second rectangular movable groove from the first U-shaped groove and the second U-shaped groove, thereby ensuring the normal use of the spring.

[0015] Preferably, a first positioning groove is provided in the middle of the inner wall of the first U-shaped groove, and a second positioning groove is provided in the middle of the inner wall of the second U-shaped groove. The frame-shaped rubber block is located between the first positioning groove and the second positioning groove, which are arranged opposite to each other, so that the position of the frame-shaped rubber block is fixed.

[0016] Preferably, the rear side of the inner wall of the semi-circular groove is provided with four threaded grooves arranged in a matrix, and the outer wall of the semi-circular block is provided with four mounting holes arranged in a matrix. Long bolts are connected in the mounting holes, and the threaded end of the long bolts is threaded into the threaded grooves, which facilitates the assembly and disassembly of the semi-circular block. The outer wall of the semi-circular block, located at the mounting hole, is provided with a storage groove for storing the long bolts, so as to prevent the bolt heads of the long bolts from being directly worn.

[0017] Preferably, the top of the drill bit body is provided with four fixed insertion rods arranged in a matrix, the bottom of the drill rig mounting base is provided with a first circular slot for inserting two rear fixed insertion rods, and the bottom of the semi-circular solid block is provided with a second circular slot for inserting two front fixed insertion rods, thereby improving the stability of the drill bit body during use and ensuring that the drill bit body can rotate stably with the drill rig mounting base.

[0018] Preferably, an annular rubber pad is placed on the top of the drill bit body, and a circular hole is opened on the top of the annular rubber pad for the fixing rod to pass through. The bottom of the annular rubber pad is tightly fitted with the top of the drill bit body, and the top of the annular rubber pad is tightly fitted with the bottom of the drill mounting base and the semi-circular solid block for sealing and preventing gravel or dust from entering the semi-circular first docking groove and the semi-circular second docking groove.

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

[0020] 1. This special drill bit for mining drilling, by setting a semi-circular first docking groove and a semi-circular second docking groove, works in conjunction with the docking post on the top of the drill bit body to achieve reliable docking between the drill bit body and the drilling rig mounting base. At the same time, the fixing component drives the fixing block to be inserted into the fixing slot on the docking post through the rectangular tie rod, further locking the docking post and effectively preventing the drill bit from loosening or detaching during operation, thereby improving the stability of the drill bit connection.

[0021] 2. This special drill bit for mining drilling slides between the first and second U-shaped grooves via a rectangular pull rod, which drives the fixed insert block to insert into or pull out of the fixed slot on the docking column. When the drill bit needs to be replaced, the operator only needs to pull the rectangular pull rod to quickly disassemble the drill bit body, which greatly simplifies the replacement operation process. Compared with the traditional drill bit replacement method, it improves work efficiency and reduces downtime.

[0022] 3. This special drill bit for mining drilling is equipped with a frame-shaped rubber block that fits tightly against the outer wall of the rectangular tie rod and is located between the first positioning groove and the second positioning groove. This structure plays a sealing role and can effectively prevent particles such as gravel and dust from entering the first rectangular movable groove and the second rectangular movable groove through the first U-shaped groove and the second U-shaped groove, thereby ensuring the normal operation of internal components such as springs and extending the service life of the device.

[0023] 4. This special drill bit for mining drilling, through the cooperation of frame-shaped rubber blocks and springs, ensures that the fixed insert is always tightly inserted into the fixed slot, avoiding accidental displacement caused by the movement of gravel pushing the rectangular tie rod. This design effectively solves the problem of drill bit separation from mounting base caused by the insertion plate being moved out due to gravel pushing the long rod in traditional technology, and significantly improves the safety of the device under complex working conditions.

[0024] 5. The special drill bit for mining has four fixed inserts on the top of the drill bit body, which are respectively inserted into the first circular slot on the drilling rig mounting base and the second circular slot on the semi-circular fixed block. This makes the drill bit body form a stable support point array after installation, which can withstand a larger working load and ensure stable rotation and drilling effect during drilling operation, avoiding drilling deviation caused by instability. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0026] Figure 2 This is a schematic diagram of the overall exploded structure of this utility model;

[0027] Figure 3 This is a partial structural schematic diagram of the present invention;

[0028] Figure 4 This is a schematic diagram of the assembly structure of the drilling rig mounting base and the semi-circular fixed block in this utility model.

[0029] Figure 5 This is a schematic diagram of the assembly structure of the drilling rig mounting base and fixing components in this utility model;

[0030] Figure 6 This is a schematic diagram of the semi-circular solid block structure in this utility model;

[0031] In the diagram: 1. Drill rig mounting base; 10. Semi-circular groove; 11. First rectangular movable groove; 12. First U-shaped groove; 13. First positioning groove; 14. Threaded groove; 15. First circular slot; 16. Semi-circular first docking groove; 2. Drill bit body; 20. Docking post; 200. Fixed slot; 21. Fixed insert; 3. Semi-circular fixed block; 30. Second rectangular movable groove; 31. Second U-shaped groove; 32. Second positioning groove; 33. Mounting hole; 34. Storage groove; 35. Second circular slot; 36. Semi-circular second docking groove; 4. Fixing component; 40. Rectangular pull rod; 400. Finger groove; 41. Fixed insert; 410. Beveled surface; 42. Spring; 43. Frame-shaped rubber block; 5. Long bolt; 6. Annular rubber pad; 60. Round hole. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component 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 utility model.

[0034] Please see Figures 1-6 This utility model provides a technical solution:

[0035] A special drill bit for mining drilling includes a drill rig mounting base 1, which is the part of the mining drill rig used to connect the drill bit. A semi-circular groove 10 is provided at the bottom of the outer wall of the drill rig mounting base 1 to provide space for accommodating a semi-circular fixed block 3 and a docking post 20. A semi-circular first docking groove 16 is vertically provided in the middle of the rear side of the inner wall of the semi-circular groove 10, which, together with the semi-circular second docking groove 36, is used to accommodate the docking post 20, so as to realize the docking and fixing of the drill bit body 2.

[0036] Two first rectangular movable grooves 11 are provided on the rear side of the inner wall of the semi-circular groove 10, which are arranged symmetrically on the left and right sides to provide sliding space for the fixing block 41 in the fixing member 4. First U-shaped grooves 12 are provided on the left and right sides of the rear side of the inner wall of the semi-circular groove 10 to provide guidance for the sliding of the rectangular pull rod 40.

[0037] The semi-circular groove 10 is provided with a detachable semi-circular fixed block 3, which is used to connect the docking column 20 together with the drilling rig mounting base 1. The semi-circular fixed block 3 has a vertically opened semi-circular second docking groove 36 in the middle of the rear side, which cooperates with the semi-circular first docking groove 16 to accommodate the docking column 20. The rear side of the semi-circular fixed block 3 has two second rectangular movable grooves 30 arranged symmetrically on the left and right sides, which are used to provide sliding space for the fixed insert 41 in the fixing member 4, and cooperate with the first rectangular movable groove 11. The left and right sides of the rear side of the semi-circular fixed block 3 are provided with second U-shaped grooves 31, which are used to guide the sliding of the rectangular tie rod 40, and cooperate with the first U-shaped groove 12.

[0038] The bottom of the drilling rig mounting base 1 is provided with a drill bit body 2, and the top of the drill bit body 2 is provided with a docking post 20. The docking post 20 is located between the semi-circular first docking groove 16 and the semi-circular second docking groove 36. The docking post 20 is embedded between the semi-circular first docking groove 16 and the semi-circular second docking groove 36 to realize the docking of the drill bit body 2 and the drilling rig mounting base 1. A fixing member 4 for positioning the docking post 20 is provided between the first rectangular movable groove 11 and the second rectangular movable groove 30 arranged in opposite directions to realize the locking and fixing of the docking post 20 and the release of positioning.

[0039] In this embodiment, the fixing member 4 includes a rectangular pull rod 40. A fixing block 41 is provided at one end of the rectangular pull rod 40 near the semi-circular first docking groove 16. The bottom of the fixing block 41 on the side away from the rectangular pull rod 40 is provided with a beveled surface 410, which facilitates the docking post 20 to overcome resistance when it is inserted and ensures smooth insertion. Two fixing slots 200 are provided on the outer wall of the docking post 20, which are arranged symmetrically from left to right. The fixing blocks 41 of the two fixing members 4 are respectively inserted into the two fixing slots 200. When the two fixing blocks 41 are respectively inserted into the two fixing slots 200, the docking post 20 can be fixed between the first rectangular movable groove 11 and the second rectangular movable groove 30, so as to realize the quick connection of the drill bit. When the two fixing blocks 41 are removed from the two fixing slots 200, the fixing of the docking post 20 can be released, thereby realizing the quick disassembly of the drill bit, so as to facilitate the worker to quickly replace the drill bit.

[0040] Specifically, the fixed plug 41 is slidably connected between the first rectangular movable groove 11 and the second rectangular movable groove 30 arranged opposite to each other, and the rectangular pull rod 40 is slidably connected between the first U-shaped groove 12 and the second U-shaped groove 31 arranged opposite to each other. The rectangular pull rod 40 is slidably connected between the first U-shaped groove 12 and the second U-shaped groove 31, and is used to drive the fixed plug 41 to slide into or out of the fixed slot 200.

[0041] Furthermore, two finger grooves 400 are provided on the outer wall of the rectangular pull rod 40 near its outer end, arranged symmetrically front to back. The outer end of the rectangular pull rod 40 is located outside the drilling rig mounting base 1, so that the operator can pull the rectangular pull rod 40 outward, thereby causing the rectangular pull rod 40 to move the fixed plug 41 and move the fixed plug 41 out of the fixed slot 200. A spring 42 is sleeved on the outer wall of the rectangular pull rod 40. One end of the spring 42 abuts against the side of the fixed plug 41, and the end of the spring 42 away from the fixed plug 41 abuts against the end face of the inner wall of the first rectangular movable groove 11 and the second rectangular movable groove 30 arranged front to back. The spring 42 is used to provide a rebound force to ensure that the fixed plug 41 is always tightly inserted into the fixed slot 200.

[0042] Furthermore, the fastener 4 also includes a frame-shaped rubber block 43, through which a rectangular pull rod 40 passes, and the outer wall of the rectangular pull rod 40 is tightly fitted with the inner wall of the frame-shaped rubber block 43 to provide a sealing effect, preventing particles from entering the first rectangular movable groove 11 and the second rectangular movable groove 30 from the first U-shaped groove 12 and the second U-shaped groove 31, thereby ensuring the normal use of the spring 42.

[0043] Furthermore, a first positioning groove 13 is provided in the middle of the inner wall of the first U-shaped groove 12, and a second positioning groove 32 is provided in the middle of the inner wall of the second U-shaped groove 31. The frame-shaped rubber block 43 is located between the first positioning groove 13 and the second positioning groove 32, which are arranged opposite to each other, so that the position of the frame-shaped rubber block 43 is fixed.

[0044] Furthermore, four threaded grooves 14 arranged in a matrix are provided on the rear side of the inner wall of the semi-circular groove 10, and four mounting holes 33 arranged in a matrix are provided on the outer wall of the semi-circular block 3. Long bolts 5 are connected in the mounting holes 33, and the threaded end of the long bolts 5 is threaded into the threaded grooves 14, which facilitates the disassembly and assembly of the semi-circular block 3. A storage groove 34 for storing the long bolts 5 is provided on the outer wall of the semi-circular block 3 at the position of the mounting holes 33, so as to prevent the bolt head of the long bolts 5 from being directly worn.

[0045] Furthermore, the top of the drill bit body 2 is provided with four fixed insertion rods 21 arranged in a matrix, the bottom of the drill rig mounting base 1 is provided with a first circular slot 15 for inserting the two rear fixed insertion rods 21, and the bottom of the semi-circular solid block 3 is provided with a second circular slot 35 for inserting the two front fixed insertion rods 21, which improves the stability of the drill bit body 2 during use and ensures that the drill bit body 2 can rotate stably with the drill rig mounting base 1.

[0046] Furthermore, an annular rubber pad 6 is placed on the top of the drill bit body 2. The top of the annular rubber pad 6 has a circular hole 60 for the fixing rod 21 to pass through. The bottom of the annular rubber pad 6 is in close contact with the top of the drill bit body 2. The top of the annular rubber pad 6 is in close contact with the bottom of the drill mounting base 1 and the semi-circular solid block 3 for sealing, preventing gravel or dust from entering the semi-circular first docking groove 16 and the semi-circular second docking groove 36.

[0047] In this embodiment, when using the special drill bit for mining drilling, firstly, the annular rubber pad 6 is placed on the top of the drill bit body 2. Then, the docking post 20 on the top of the drill bit body 2 is aligned with the semi-circular first docking groove 16 and the semi-circular second docking groove 36 on the bottom of the drill rig mounting base 1. The docking post 20 is then inserted between the semi-circular first docking groove 16 and the semi-circular second docking groove 36. The fixing block 41 in the fixing member 4 is inserted into the fixing slot 200 on the docking post 20 to lock the drill bit body 2. The rebound force of the spring 42 ensures that the fixing block 41 is always tightly inserted into the fixing slot 200, preventing the drill bit body 2 from loosening or detaching during operation. At the same time, the fixing rod 21 on the top of the drill bit body 2 is inserted into the first circular slot 15 of the drill rig mounting base 1 and the second circular slot 35 of the semi-circular fixing block 3, respectively, to further stabilize the drill bit body 2 and ensure that the drill bit body 2 is aligned and stably connected with the drill rig mounting base 1. The annular rubber pad 6 is aligned with the top of the drill bit body 2 and the drill rig mounting base 1. The mounting base 1 and the semi-circular fixed block 3 fit tightly together to ensure a sealing effect and prevent gravel or dust from entering the semi-circular first docking groove 16 and the semi-circular second docking groove 36. The frame-shaped rubber block 43 prevents gravel or particles from entering the first rectangular movable groove 11 and the second rectangular movable groove 30 through the first U-shaped groove 12 and the second U-shaped groove 31. During operation, the drill rig drives the drill bit body 2 to drill. The stable connection between the fixed insertion rod 21 and the first circular slot 15 and the second circular slot 35 ensures the smooth operation of the drill bit body 2. When it is necessary to replace or maintain the drill bit, the operator pulls the rectangular pull rod 40 outward through the finger groove 400 to remove the fixed insertion block 41 from the fixed slot 200, releasing the fixation of the docking post 20. Then, the rectangular pull rod 40 is released, and the spring 42 returns to its original position. At this time, the drill bit body 2 has been disengaged from the semi-circular first docking groove 16 and the semi-circular second docking groove 36 and can be easily removed. When replacing the new drill bit body 2, it is reinstalled according to the above assembly steps.

[0048] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A drill bit specifically for mining drilling, comprising a drill rig mounting base (1), characterized in that: The bottom of the outer wall of the drilling rig mounting base (1) is provided with a semi-circular groove (10). A semi-circular first docking groove (16) is vertically provided in the middle of the rear side of the inner wall of the semi-circular groove (10). Two first rectangular movable grooves (11) are provided on the rear side of the inner wall of the semi-circular groove (10) in a left-right symmetrical arrangement. A first U-shaped groove (12) is provided on both the left and right sides of the rear side of the inner wall of the semi-circular groove (10). A detachable semi-circular fixed block (3) is provided in the semi-circular groove (10). A semi-circular second docking groove (36) is vertically provided in the middle of the rear side of the semi-circular fixed block (3). Two second rectangular movable slots (30) are provided on the rear side of the solid block (3) in a symmetrical arrangement. The left and right sides of the rear side of the semi-circular solid block (3) are provided with second U-shaped grooves (31). The bottom of the drilling rig mounting base (1) is provided with a drill bit body (2). The middle of the top of the drill bit body (2) is provided with a docking post (20). The docking post (20) is located between the semi-circular first docking slot (16) and the semi-circular second docking slot (36). The first rectangular movable slot (11) and the second rectangular movable slot (30) are arranged opposite to each other and a fixing member (4) is provided between them for positioning the docking post (20).

2. The special drill bit for mining drilling according to claim 1, characterized in that: The fastener (4) includes a rectangular pull rod (40). The end of the rectangular pull rod (40) near the semi-circular first docking groove (16) is provided with a fixing block (41). The bottom of the fixing block (41) on the side away from the rectangular pull rod (40) is provided with a beveled surface (410). The outer wall of the docking post (20) is provided with two fixing slots (200) arranged symmetrically on the left and right. The fixing blocks (41) of the two fasteners (4) are respectively inserted into the two fixing slots (200).

3. The special drill bit for mining drilling according to claim 2, characterized in that: The fixed insert (41) is slidably connected between the first rectangular movable groove (11) and the second rectangular movable groove (30) arranged opposite to each other, and the rectangular pull rod (40) is slidably connected between the first U-shaped groove (12) and the second U-shaped groove (31) arranged opposite to each other.

4. The special drill bit for mining drilling according to claim 3, characterized in that: Two finger grooves (400) are provided on the outer wall of the rectangular pull rod (40) near the outer end. A spring (42) is sleeved on the outer wall of the rectangular pull rod (40). One end of the spring (42) abuts against the side of the fixed plug (41), and the other end of the spring (42) away from the fixed plug (41) abuts against the end face of the inner wall of the first rectangular movable groove (11) and the second rectangular movable groove (30) arranged opposite to each other.

5. The special drill bit for mining drilling according to claim 2, characterized in that: The fastener (4) also includes a frame-shaped rubber block (43), through which the rectangular pull rod (40) passes, and the outer wall of the rectangular pull rod (40) is in close contact with the inner wall of the frame-shaped rubber block (43).

6. The special drill bit for mining drilling according to claim 5, characterized in that: The first U-shaped groove (12) has a first positioning groove (13) in the middle of its inner wall, and the second U-shaped groove (31) has a second positioning groove (32) in the middle of its inner wall. The frame-shaped rubber block (43) is located between the first positioning groove (13) and the second positioning groove (32) which are arranged opposite to each other.

7. The special drill bit for mining drilling according to claim 1, characterized in that: The rear side of the inner wall of the semi-circular groove (10) is provided with four threaded grooves (14) arranged in a matrix. The outer wall of the semi-circular block (3) is provided with four mounting holes (33) arranged in a matrix. A long bolt (5) is connected in the mounting hole (33). The threaded end of the long bolt (5) is threaded in the threaded groove (14). The outer wall of the semi-circular block (3) and the position of the mounting hole (33) are provided with a storage groove (34) for storing the long bolt (5).

8. The special drill bit for mining drilling according to claim 1, characterized in that: The top of the drill bit body (2) is provided with four fixed insert rods (21) arranged in a matrix. The bottom of the drill mounting base (1) is provided with a first circular slot (15) for the two rear fixed insert rods (21) to be inserted. The bottom of the semi-circular solid block (3) is provided with a second circular slot (35) for the two front fixed insert rods (21) to be inserted.

9. The special drill bit for mining drilling according to claim 8, characterized in that: The top of the drill bit body (2) is provided with an annular rubber pad (6), and the top of the annular rubber pad (6) is provided with a circular hole (60) for the fixed insertion rod (21) to pass through. The bottom of the annular rubber pad (6) is in close contact with the top of the drill bit body (2), and the top of the annular rubber pad (6) is in close contact with the bottom of the drill mounting base (1) and the semi-circular solid block (3).

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