Drilling machine drill bit

Abstract

The application relates to the field of drilling equipment and discloses a drilling machine drill bit, which comprises a connecting section connected with a drilling machine and a mounting seat arranged at the lower end of the connecting section and used for mounting a drill cutter, the drill cutter comprises a first drill bit fixed at the lower end of the mounting seat and a second drill bit arranged in the mounting seat at equal angles, and the drilling machine drill bit further comprises an adjusting device arranged on the mounting seat and connected with the second drill bit and used for adjusting the mounting position of the second drill bit; the adjusting device comprises a transmission part arranged on the mounting seat and connected with the second drill bit and a rotating part arranged on the mounting seat and connected with the transmission part and used for adjusting the length of the second drill bit extending out of the mounting seat; the second drill bit can be adjusted according to the design size of a borehole, so that the practicability of the whole drilling machine drill bit is higher.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of drilling equipment, in particular to a drilling machine drill bit. BACKGROUND

[0002] In the process of oil and gas exploration and exploitation, the drilling machine drill bit is an indispensable key tool. The traditional drilling machine drill bit is usually composed of a connecting section and a drill bit fixed at the lower end of the connecting section. The drill bit generally includes one or more fixed drill bits, which directly contact and break the formation rock during drilling.

[0003] The existing equipment has the following disadvantages: the structure of the existing fixed drill bit limits its adaptability to different hole diameters, making it difficult to meet the increasing flexibility and accuracy requirements in modern drilling operations. In the process of drilling, the diameter of the drill bit will continuously decrease due to the frictional wear between the drill bit and the formation, resulting in a gradual decrease in the size of the wellbore drilled by the drill bit, causing the size of the drilled wellbore to deviate.

[0004] Therefore, the present application proposes a drilling machine drill bit to solve the above problems. SUMMARY

[0005] The present application aims to provide a drilling machine drill bit to solve the above problems of being difficult to meet the increasing flexibility and accuracy requirements in modern drilling operations, and causing the size of the drilled wellbore to deviate.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solution: a drilling machine drill bit, comprising a connecting section connected to a drilling machine and a mounting seat provided at the lower end of the connecting section for mounting a drill bit, the drill bit comprising a first drill bit fixed at the lower end of the mounting seat and a second drill bit angularly arranged in the mounting seat, further comprising:

[0007] An adjusting device is provided on the mounting seat and connected to the second drill bit, for adjusting the mounting position of the second drill bit;

[0008] The adjusting device comprises:

[0009] A transmission member is provided on the mounting seat and connected to the second drill bit;

[0010] A rotating member is provided on the mounting seat and connected to the transmission member, for adjusting the length of the second drill bit extending out of the mounting seat.

[0011] The mounting seat comprises a lower seat sleeved on the connecting segment and an upper seat detachably fixed on the lower seat, the upper seat is fixedly connected with the lower seat through a fixing bolt, the second drill bit is adjustably arranged between the upper seat and the lower seat, a positioning hole for mounting the fixing bolt is formed on the lower seat, a supporting ring is arranged on the inner wall of the lower seat, and a mounting groove for mounting the fixing bolt is formed on the upper seat.

[0012] The side of the second drill bit connected with the lower seat is provided with a sliding block, a sliding groove for the movement of the sliding block is formed on the lower seat, and a limiting groove for the movement of the sliding block is formed on the upper seat.

[0013] The rotating member comprises an insertion end inserted in the lower seat, a rotating shaft arranged on the side of the insertion end inside the lower seat, and a gear sleeved on the rotating shaft, and the rotating shaft is rotatably arranged in the supporting ring.

[0014] The lower seat is provided with a fixing groove at the position corresponding to the insertion end, a limiting rod is arranged at the position where the fixing groove is connected with the insertion end, and a limiting groove is arranged at the position corresponding to the limiting rod on the insertion end.

[0015] The transmission member comprises a rotating disc arranged between the supporting ring and the positioning hole, an annular tooth ring arranged at the lower end of the rotating disc and meshingly connected with the gear, and a disc-shaped tooth ring arranged at the upper end of the rotating disc and connected with the sliding block, a tooth groove meshingly connected with the disc-shaped tooth ring is formed at the lower end of the sliding block at the position corresponding to the disc-shaped tooth ring, and a moving groove for the movement of the rotating disc is formed on the lower seat at the position corresponding to the rotating disc.

[0016] The inside of the insertion end is provided with a limiting mechanism for fixedly connecting the insertion end with the lower seat.

[0017] The limiting mechanism comprises a pressing block arranged in the insertion end in a trapezoidal shape, a supporting member arranged on the side of the pressing block close to the supporting ring, and fixing members arranged on both sides of the pressing block for fixing the insertion end, the fixing members are symmetrically arranged about the pressing block, and an insertion opening for the movement of the pressing block is formed on the insertion end.

[0018] The supporting member comprises a moving rod fixed on the pressing block and inserted in the insertion end, and a second elastic member sleeved on the moving rod, and an empty slot for the movement of the moving rod and communicating with the insertion opening is formed on the insertion end.

[0019] The fixed part comprises a fixed rod arranged on the insertion end, a pushing block arranged on the fixed rod close to the extruding block, and a first elastic part sleeved on the fixed rod, the insertion end is provided with a hollow groove at a position corresponding to the moving direction of the pushing block, the first elastic part is located between the pushing block and the hollow groove, and the lower seat is provided with a fixing hole for fixing the fixed rod.

[0020] Compared with the prior art, the present application has the following advantages:

[0021] The present application can adjust the rotating part to rotate on the mounting seat, thereby driving the transmission part to rotate, so that the transmission part drives the second drill connected to the upper end to move on the mounting seat, thereby changing the extension distance of the second drill on the mounting seat, and adjusting the size of the wellbore drilled by the drilling machine, when the second drill is worn, the transmission part can drive the second drill to extend from the mounting seat to compensate for the worn distance, so that the size of the wellbore drilled by the second drill meets the design requirements, and the second drill can be adjusted according to the design size of the wellbore, so that the practicability of the entire drilling machine drill is stronger. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a main structure schematic diagram in an embodiment of the present application;

[0023] Figure 2 It is a front view structure schematic diagram in an embodiment of the present application;

[0024] Figure 3 It is a bottom view structure schematic diagram in an embodiment of the present application;

[0025] Figure 4 It is a sectional view structure schematic diagram in an embodiment of the present application;

[0026] Figure 5 It is an explosion structure schematic diagram in an embodiment of the present application;

[0027] Figure 6 It is a mounting seat and second drill connection structure schematic diagram in an embodiment of the present application;

[0028] Figure 7 It is a second drill and lower seat connection structure schematic diagram in an embodiment of the present application;

[0029] Figure 8 It is a structure schematic diagram for adjusting the mounting position of the second drill in an embodiment of the present application;

[0030] Figure 9 It is a transmission part and lower seat connection structure schematic diagram in an embodiment of the present application;

[0031] Figure 10Structure diagram of the structure that the adjusting device is connected with the second drill bit in an embodiment of the present application;

[0032] Figure 11 Structure diagram of the structure that the transmission member is connected with the second drill bit in an embodiment of the present application;

[0033] Figure 12 Structure diagram of the structure of the disc-shaped tooth ring in an embodiment of the present application;

[0034] Figure 13 Structure diagram of the structure that the lower seat is connected with the limiting mechanism in an embodiment of the present application;

[0035] Figure 14 Structure diagram of the structure that the limiting mechanism is cut in an embodiment of the present application;

[0036] Figure 15 Structure diagram of the structure that the fixing member is connected with the insertion end in an embodiment of the present application;

[0037] Figure 16 Structure diagram of the structure of the fixing member in an embodiment of the present application.

[0038] In the figure: 1, connecting section; 2, mounting seat; 21, upper seat; 2101, limiting groove; 2102, mounting groove; 22, lower seat; 2201, fixing groove; 2202, positioning hole; 2203, sliding groove; 2204, moving groove; 2205, fixing hole; 221, support ring; 23, fixing bolt; 3, first drill bit; 4, second drill bit; 41, sliding block; 4101, tooth groove; 5, adjusting device; 51, rotating member; 511, insertion end; 51101, insertion port; 51102, limiting groove; 512, rotating shaft; 513, gear; 51301, empty groove; 52, transmission member; 521, rotating disc; 522, annular tooth ring; 523, disc-shaped tooth ring; 53, limiting rod; 54, limiting mechanism; 541, extrusion block; 542, moving rod; 543, fixing member; 5431, pushing block; 5432, fixing rod; 5433, first elastic member; 544, second elastic member. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0040] Please refer to Figures 1-16The application provides a technical scheme: a drilling machine drill bit, which comprises a connecting section 1 connected with a drilling machine and a mounting seat 2 arranged at the lower end of the connecting section 1 and used for mounting a drill bit, the drill bit comprises a first drill bit 3 fixed at the lower end of the mounting seat 2 and a second drill bit 4 arranged in the mounting seat 2 at equal angles, and further comprises:

[0041] An adjusting device 5 is arranged on the mounting seat 2 and connected with the second drill bit 4, and is used for adjusting the mounting position of the second drill bit 4.

[0042] The adjusting device 5 comprises:

[0043] A transmission member 52 is arranged on the mounting seat 2 and connected with the second drill bit 4.

[0044] A rotating member 51 is arranged on the mounting seat 2 and connected with the transmission member 52, and is used for adjusting the length of the second drill bit 4 extending out of the mounting seat 2.

[0045] It should be noted that, in operation, the connecting section 1 is fixed with a drill rod of the drilling machine, the second drill bit 4 is mounted at a set position of the mounting seat 2, the first drill bit 3 is fixed at the lower end of the mounting seat 2, then the mounting seat 2 is mounted at the lower end of the connecting section 1, and after the first drill bit 3 and the second drill bit 4 are fixed, the drilling machine is started, the first drill bit 3 and the second drill bit 4 are driven by the drill rod to drill the ground, when the diameter of the wellbore to be drilled needs to be changed, the rotating member 51 is adjusted to rotate on the mounting seat 2, thereby driving the transmission member 52 to rotate, the transmission member 52 drives the second drill bit 4 connected at the upper end to move on the mounting seat 2, so that the extension distance of the second drill bit 4 on the mounting seat 2 is changed, and the size of the wellbore drilled by the drilling machine is adjusted, when the second drill bit 4 is worn, the second drill bit 4 is extended out of the mounting seat 2 by the transmission member 52 to compensate for the worn distance, so that the size of the wellbore drilled by the second drill bit 4 meets the design requirement, and the second drill bit 4 can be adjusted according to the design size of the wellbore, so that the practicability of the entire drilling machine drill bit is higher.

[0046] In an embodiment, the mounting seat 2 comprises a lower seat 22 sleeved on the connecting section 1 and an upper seat 21 detachably fixed on the lower seat 22, the upper seat 21 is fixedly connected with the lower seat 22 through a fixing bolt 23, the second drill bit 4 is adjustably arranged between the upper seat 21 and the lower seat 22, the lower seat 22 is provided with a positioning hole 2202 for mounting the fixing bolt 23, a supporting ring 221 is arranged on the inner wall of the lower seat 22, the upper seat 21 is provided with a mounting groove 2102 for mounting the fixing bolt 23, and the first drill bit 3 is threadedly connected with the lower seat 22.

[0047] In this way, the mounting seat 2 is detachably fixed on the connecting section 1, the first drill bit 3 and the second drill bit 4 can be replaced, and the second drill bit 4 can be adjusted according to the design size of the wellbore, so that the practicability of the entire drilling machine drill bit is higher. Figures 1-7The mounting base 2 adopts a modular design of upper base 21 and lower base 22, which is convenient for disassembly and replacement, reducing maintenance costs. When a part is damaged or needs to be upgraded, only the corresponding part needs to be replaced, without replacing the entire mounting base 2. The upper base 21 is fixedly connected to the lower base 22 by fixing bolts 23, ensuring the stability and rigidity of the mounting base 2. The second drill bit 4 is adjustable between the upper base 21 and the lower base 22, allowing the drill bit to be flexibly adjusted according to actual drilling needs. The positioning hole 2202 on the lower base 22 and the mounting groove 2102 on the upper base 21 provide precise positioning for the fixing bolts 23, ensuring a tight connection and accurate alignment between the upper base 21 and the lower base 22. The connecting section 1 is rotatably inserted into the support ring 221. The first drill bit 3 is connected to the lower base 22 by a thread. This connection method makes the replacement of the first drill bit 3 more convenient and efficient. When the first drill bit 3 is worn or needs to be replaced, it can be quickly replaced simply by rotating the first drill bit 3.

[0048] In one embodiment, a sliding block 41 is provided on the side of the second drill bit 4 connected to the lower seat 22. A sliding groove 2203 for the sliding block 41 to move is provided on the lower seat 22, and a limiting groove 2101 for the sliding block 41 to move is provided on the upper seat 21. The second drill bit 4 extends out of the lower seat 22 by the same distance.

[0049] This design is for reference. Figure 10 The cooperation between the sliding block 41 and the sliding groove 2203 provides stable guidance and support for the second drill bit 4. During the drilling process, this design can effectively prevent the second drill bit 4 from deviating or shaking, ensuring that the second drill bit 4 drills along the predetermined trajectory, thereby improving the accuracy and stability of drilling. The limiting groove 2101 on the upper seat 21 further restricts the movement range of the sliding block 41.

[0050] In one embodiment, the rotating member 51 includes an insertion end 511 inserted into the lower seat 22, a rotating shaft 512 disposed on the side of the insertion end 511 located inside the lower seat 22, and a gear 513 sleeved on the rotating shaft 512. The rotating shaft 512 is rotatably disposed in the support ring 221.

[0051] This design is for reference. Figures 9-11 ,as well as Figure 15The rotating component 51 is tightly connected to the lower seat 22 through the insertion end 511, ensuring stability during transmission. The rotation setting of the rotating shaft 512 in the support ring 221 further enhances the smoothness of transmission. The adjusting wrench is inserted into the insertion end 511, which drives the gear 513 to rotate, so that the rotating component 51 can mesh with the transmission component 52. This allows the transmission component 52 to drive the second drill bit 4 to move on the lower seat 22, thereby adjusting the distance of the second drill bit 4 extending out of the lower seat 22. At the same time, the supporting effect of the support ring 221 on the rotating shaft 512 also reduces vibration and impact during rotation, extending the service life of the rotating component 51.

[0052] In one embodiment, a fixing groove 2201 is provided at the position of the corresponding insertion end 511 of the lower seat 22, a limiting rod 53 is provided at the position where the fixing groove 2201 connects with the insertion end 511, and a limiting groove 51102 is provided at the position of the corresponding limiting rod 53 of the insertion end 511.

[0053] This design is for reference. Figure 11 ,as well as Figures 14-16 The cooperation between the limiting rod 53 and the limiting groove 51102 enables the insertion end 511 to be accurately positioned in the fixing groove 2201, avoiding loosening or instability of the connection due to positional deviation. The design of the limiting rod 53 and the limiting groove 51102 effectively prevents the insertion end 511 from accidentally falling out of the fixing groove 2201, enhancing the reliability of the connection.

[0054] In one embodiment, the transmission component 52 includes a rotating disk 521 disposed between the support ring 221 and the positioning hole 2202, an annular toothed ring 522 disposed at the lower end of the rotating disk 521 and meshing with the gear 513, and a disc-shaped toothed ring 523 disposed at the upper end of the rotating disk 521 and connected to the sliding block 41. A tooth groove 4101 meshing with the disc-shaped toothed ring 523 is provided at the lower end of the sliding block 41 at the position corresponding to the position of the disc-shaped toothed ring 523. A moving groove 2204 for the rotating disk 521 to move is provided at the position corresponding to the position of the lower seat 22.

[0055] This design is for reference. Figures 9-11The insertion end 511 rotates under the drive of the adjusting wrench, which in turn causes the rotating shaft 512 to rotate inside the support ring 221. When the gear 513 rotates, it meshes with the annular toothed ring 522, causing the rotating disk 521 to rotate inside the moving groove 2204. The gear 513 is provided with multiple supports for the rotating disk 521. During the rotation, the disc-shaped toothed ring 523 at the upper end of the rotating disk 521 meshes with the tooth groove 4101 at the lower end of the sliding block 41, which in turn drives the second drill bit 4 to move at the upper end of the lower seat 22. The meshing connection between the annular toothed ring 522 and the gear 513, and the meshing connection between the disc-shaped toothed ring 523 and the tooth groove 4101 of the sliding block 41, form an efficient transmission mechanism. This transmission method has the characteristics of accurate transmission ratio, high transmission efficiency, and strong load-bearing capacity, which facilitates the adjustment of the position of the second drill bit 4 and makes the second drill bit 4 more stable during drilling.

[0056] In one embodiment, the insertion end 511 is provided with a limiting mechanism 54 for fixing the insertion end 511 to the lower seat 22.

[0057] This design is for reference. Figure 13 The limiting mechanism 54 ensures a more secure connection between the insertion end 511 and the lower seat 22, preventing loosening or detachment due to vibration, impact, or other external factors. This secure connection is crucial for the stable operation of the drilling rig in harsh working environments (such as when the drill bit is drilling into relatively firm ground and the torsional stress on the drill bit is large, causing the connection between the drill bit and the connector to be subjected to large stress). The secure connection reduces the safety accidents that may be caused by loosening or detachment of parts, and ensures the safety of operators.

[0058] In one embodiment, the limiting mechanism 54 includes a trapezoidal compression block 541 disposed in the insertion end 511, a support member disposed on the side of the compression block 541 near the support ring 221, and fixing members 543 disposed on both sides of the compression block 541 for fixing the insertion end 511. The fixing members 543 are symmetrically arranged about the compression block 541, and the insertion end 511 is provided with an insertion port 51101 for the compression block 541 to move.

[0059] This design is for reference. Figures 13-16Insert the adjusting wrench into the insertion port 51101, and then push the pressing block 541 to move towards the side closer to the support ring 221. The pressing block 541 adopts a trapezoidal design, which can drive the fixing member 543 to move inside the insertion end 511 during the movement, thereby contacting the restriction of the fixing member 543 on the insertion end 511. At this time, the adjusting wrench can be rotated, thereby causing the insertion end 511 to rotate inside the lower seat 22. After the extension length of the second drill bit 4 is adjusted, the adjusting wrench is pulled out from the insertion port 51101, and then the pressing block 541 is reset, thereby driving the fixing member 543 to snap and fix in the lower seat 22, fixing the position of the insertion end 511. The limiting mechanism 54 improves the stability of the second drill bit 4 and reduces the phenomenon that when the torsional stress on the drill bit is large, the stress on the second drill bit 4 is large, which drives the transmission member 52 to rotate, thereby changing the installation position of the second drill bit 4. A stable connection can reduce equipment failure and downtime caused by loose connection or large stress, thereby extending the service life of the equipment.

[0060] In one embodiment, the support includes a movable rod 542 fixed to the pressing block 541 and inserted into the insertion end 511, and a second elastic member 544 sleeved on the movable rod 542. The insertion end 511 has a slot 51301 for the movable rod 542 to move and communicates with the insertion port 51101. The second elastic member 544 is made of a damped spring or an elastic pad.

[0061] This design is for reference. Figures 14-16 The moving rod 542 is fixed on the pressing block 541 and inserted into the insertion end 511, providing a stable support for the pressing block 541. Under the pressure of the adjusting wrench, the pressing block 541 drives the moving rod 542 to move in the empty groove 51301, thereby causing the pressing block 541 to press the second elastic member 544. When the adjusting wrench is removed from the insertion port 51101, the second elastic member 544 can drive the pressing block 541 to reset, thereby causing the pressing block 541 to drive the fixing member 543 to be inserted into the lower seat 22 to fix the gear 513.

[0062] In one embodiment, the fixing member 543 includes a fixing rod 5432 passing through the insertion end 511, a pushing block 5431 disposed on the side of the fixing rod 5432 near the pressing block 541, and a first elastic member 5433 sleeved on the fixing rod 5432. A slot 51301 is provided at the position of the insertion end 511 corresponding to the moving direction of the pushing block 5431. The first elastic member 5433 is located between the pushing block 5431 and the slot 51301. A fixing hole 2205 for fixing the fixing rod 5432 is provided on the lower seat 22. The first elastic member 5433 is made of a damped spring or an elastic pad.

[0063] This design is for reference.Figures 14-16 The fixed rod 5432 is arranged on the insertion end 511 and is fixedly connected with the lower seat 22 through the fixed hole 2205, which can ensure the stable and reliable connection between the insertion end 511 and the lower seat 22 and prevent the connection from loosening or falling off due to external force. The first elastic member 5433 is sleeved on the fixed rod 5432, the first elastic member 5433 is compressed to generate elastic force, and is located between the pushing block 5431 and the hollow groove 51301. When the extrusion block 541 moves to one side of the supporting ring 221, the first elastic member 5433 can drive the pushing block 5431 to move close to each other, so that the fixed rod 5432 is pulled out of the fixed hole 2205. At this time, the insertion end 511 can be rotated in the fixed groove 2201 by adjusting the wrench. After the position of the second drill bit 4 is adjusted, the extrusion block 541 is pulled out of the insertion hole 51101, and then the extrusion block 541 can move away from one side of the supporting ring 221, thereby driving the pushing block 5431 to move away from each other, so that the fixed rod 5432 is inserted into the fixed hole 2205, and the fixed rod 5432 is fixed on the lower seat 22.

[0064] In addition, if the description of "first", "second" and the like is involved in the embodiments, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features with "first", "second" can explicitly or implicitly include at least one of the features.

Claims

1. A drilling machine drill bit, comprising a connecting section (1) connected with a drilling machine and a mounting seat (2) arranged at a lower end of the connecting section (1) for mounting a drill cutter, the drill cutter comprising a first drill bit (3) fixed at a lower end of the mounting seat (2) and a second drill bit (4) arranged in the mounting seat (2) at equal angles, characterized in that, Also comprising: an adjusting device (5) arranged on the mounting base (2) and connected with the second drill bit (4), for adjusting the installation position of the second drill bit (4); the adjusting device (5) comprises: a transmission member (52) arranged on the mounting base (2) and connected with the second drill bit (4); a rotating member (51) arranged on the mounting base (2) and engaged with the transmission member (52), for adjusting the length of the second drill bit (4) extending out of the mounting base (2); the mounting base (2) comprises a lower seat (22) sleeved on the connecting section (1) and an upper seat (21) detachably fixed on the lower seat (22), the upper seat (21) is fixedly connected with the lower seat (22) through a fixing bolt (23), the second drill bit (4) is adjustably arranged between the upper seat (21) and the lower seat (22), the lower seat (22) is provided with a positioning hole (2202) for installing the fixing bolt (23), and the inner wall of the lower seat (22) is provided with a supporting ring (221), the upper seat (21) is provided with an installation groove (2102) for installing the fixing bolt (23); one side of the second drill bit (4) connected with the lower seat (22) is provided with a sliding block (41), the lower seat (22) is provided with a sliding groove (2203) for the movement of the sliding block (41), and the upper seat (21) is provided with a limiting groove (2101) for the movement of the sliding block (41), the second drill bit (4) extends out of the lower seat (22) by the same distance; the rotating member (51) comprises an insertion end (511) inserted in the lower seat (22), a rotating shaft (512) arranged on one side of the insertion end (511) inside the lower seat (22), and a gear (513) sleeved on the rotating shaft (512), and the rotating shaft (512) is rotatably arranged in the supporting ring (221); the transmission member (52) comprises a rotating disc (521) arranged between the supporting ring (221) and the positioning hole (2202), an annular tooth ring (522) arranged at the lower end of the rotating disc (521) and engaged with the gear (513), and a disc-shaped tooth ring (523) arranged at the upper end of the rotating disc (521) and connected with the sliding block (41), the lower end of the sliding block (41) is provided with a tooth groove (4101) engaged with the disc-shaped tooth ring (523) at the position corresponding to the disc-shaped tooth ring (523), and the lower seat (22) is provided with a movement groove (2204) for the movement of the rotating disc (521) at the position corresponding to the rotating disc (521).

2. The drill bit of claim 1, wherein: the lower seat (22) is provided with a fixing groove (2201) at the position corresponding to the insertion end (511), the position where the fixing groove (2201) is connected with the insertion end (511) is provided with a limiting rod (53), and the insertion end (511) is provided with a limiting groove (51102) at the position corresponding to the limiting rod (53).

3. The drill bit of claim 2, wherein: The inside of the insertion end (511) is provided with a limiting mechanism (54) for fixedly connecting the insertion end (511) with the lower seat (22).

4. The drill bit of claim 3, wherein: The limiting mechanism (54) comprises extrusion blocks (541) arranged in a trapezoidal shape in the insertion end (511), support members arranged on the side of the extrusion blocks (541) close to the support ring (221), and fixing members (543) arranged on both sides of the extrusion blocks (541) for fixing the insertion end (511), the fixing members (543) being symmetrically arranged relative to the extrusion blocks (541), and the insertion end (511) being provided with an insertion opening (51101) for movement of the extrusion blocks (541).

5. The drill bit of claim 4, wherein: The support members comprise a moving rod (542) fixed on the extrusion blocks (541) and inserted in the insertion end (511), and a second elastic member (544) sleeved on the moving rod (542), the insertion end (511) being provided with an empty slot (51301) for movement of the moving rod (542) and communicating with the insertion opening (51101).

6. The drill bit of claim 5, wherein: The fixing members (543) comprise a fixing rod (5432) penetrating through the insertion end (511), a pushing block (5431) arranged on the side of the fixing rod (5432) close to the extrusion blocks (541), and a first elastic member (5433) sleeved on the fixing rod (5432), the insertion end (511) being provided with an empty slot (51301) at the position corresponding to the moving direction of the pushing block (5431), the first elastic member (5433) being located between the pushing block (5431) and the empty slot (51301), and the lower seat (22) being provided with a fixing hole (2205) for fixing the fixing rod (5432).

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