Drill bit of well drill

Abstract

Relates to the field of well drilling equipment, and discloses a well 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 drilling tool, and the drilling tool comprises a first drill bit fixed to the lower end of the mounting seat and a second drill bit movably arranged in the mounting seat at an equal angle. The adjusting device is arranged on the mounting seat, is connected with the second drill bit and is 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; the rotating part is arranged on the mounting base, connected with the transmission part and used for adjusting the length, extending out of the mounting base, of the second drill bit, the adjustably-arranged second drill bit can be adjusted according to the design size of a well hole, and the practicability of the whole well drill bit is higher.

Description

Technical Field

[0001] The invention relates to the technical field of drilling equipment, in particular to a drilling rig drill bit. Background Art

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

[0003] The existing equipment has the following disadvantages: the structure of the existing fixed drill bit limits its adaptability to different well diameters, and it is difficult to meet the growing flexibility and precision requirements in modern drilling operations. During the drilling process, due to the friction loss between the drill bit and the formation, the diameter of the drill bit will continue to decrease, causing the wellbore drilled by the drill bit to gradually become smaller, resulting in deviations in the size of the drilled wellbore.

[0004] Therefore, the present application now proposes a drilling rig drill bit to solve the above-mentioned problems. Summary of the invention

[0005] The object of the present invention is to provide a drilling machine drill bit to solve the above-mentioned problem that it is difficult to meet the increasing flexibility and precision requirements in modern drilling operations and that the size of the drilled wellbore may deviate.

[0006] To achieve the above object, the present invention provides the following technical solution: a drilling rig drill bit, comprising a connecting section connected to the drilling rig and a mounting seat arranged 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 movably arranged at an equal angle in the mounting seat, and further comprising:

[0007] an adjusting device, disposed on the mounting seat and connected to the second drill bit, and used for adjusting the mounting position of the second drill bit;

[0008] The regulating device comprises:

[0009] a transmission member, disposed on the mounting seat and connected to the second drill bit;

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

[0011] Wherein, the mounting seat includes a lower seat sleeved on the connecting section and an upper seat detachably fixed on the lower seat, the upper seat is fixedly connected to the lower seat by a fixing bolt, the second drill bit is adjustably arranged between the upper seat and the lower seat, a positioning hole for installing the fixing bolt is provided on the lower seat, a support ring is provided on the inner wall of the lower seat, and a mounting groove for installing the fixing bolt is provided on the upper seat.

[0012] A sliding block is arranged on one side of the second drill bit connected to the lower seat, a sliding groove for movement of the sliding block is provided on the lower seat, a limiting groove for movement of the sliding block is provided on the upper seat, and the second drill bit extends out of the lower seat by the same distance.

[0013] Wherein, the rotating member includes an insertion end inserted in the lower seat, a rotating shaft arranged on the insertion end at one side inside the lower seat, and a gear sleeved on the rotating shaft, and the rotating shaft is rotatably arranged in the support ring.

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

[0015] Wherein, the transmission member includes a rotating disk arranged between the support ring and the positioning hole, an annular gear ring arranged at the lower end of the rotating disk and meshingly connected with the gear, and a disc-shaped gear ring arranged at the upper end of the rotating disk and connected to the sliding block, a tooth groove meshingly connected with the disc-shaped gear ring is opened at the position of the lower end of the sliding block corresponding to the disc-shaped gear ring, and a moving groove for the rotating disk to move is opened at the position of the lower seat corresponding to the rotating disk.

[0016] Wherein, a limiting mechanism for fixedly connecting the insertion end and the lower seat is arranged inside the insertion end.

[0017] Among them, the limiting mechanism includes an extrusion block arranged in a trapezoidal shape in the insertion end, a support member arranged on the side of the extrusion block close to the support ring, and fixing members arranged on both sides of the extrusion block for fixing the insertion end. The fixing members are symmetrically arranged about the extrusion block, and an insertion port for the extrusion block to move is opened on the insertion end.

[0018] Wherein, the support member includes a moving rod fixed on the extrusion block and inserted in the insertion end and a second elastic member sleeved on the moving rod, and an empty groove for the moving rod to move and connected to the insertion port is opened on the insertion end.

[0019] Among them, the fixing member includes a fixing rod passed through the insertion end, a pushing block arranged on the side of the fixing rod close to the extrusion block, and a first elastic member sleeved on the fixing rod, and an empty groove is opened at the position of the insertion end corresponding to the moving direction of the pushing block, the first elastic member is located between the pushing block and the empty groove, and a fixing hole for fixing the fixing rod is opened on the lower seat.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention can adjust the rotating member to rotate on the mounting seat, thereby driving the transmission member to rotate, so that the transmission member drives the second drill bit connected to the upper end to move on the mounting seat, thereby changing the extension distance of the second drill bit on the mounting seat, and then adjusting the size of the wellbore drilled by the drilling rig; when the second drill bit is worn, the second drill bit can be driven to extend from the mounting seat by the transmission member to compensate for the wear distance, so that the size of the wellbore drilled by the second drill bit meets the design requirements; the adjustably set second drill bit can be adjusted according to the design size of the wellbore, making the entire drilling rig drill bit more practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the main structure in one embodiment of the present invention;

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

[0024] Figure 3 It is a schematic diagram of the structure when viewed from above in one embodiment of the present invention;

[0025] Figure 4 It is a schematic diagram of a cross-section structure in one embodiment of the present invention;

[0026] Figure 5 It is a schematic diagram of the structure of explosion in one embodiment of the present invention;

[0027] Figure 6 It is a schematic diagram of the structure of the connection between the mounting base and the second drill bit in one embodiment of the present invention;

[0028] Figure 7 It is a schematic diagram of the structure in which the second drill bit is connected to the lower seat in one embodiment of the present invention;

[0029] Figure 8 It is a structural schematic diagram of adjusting the installation position of the second drill bit in one embodiment of the present invention;

[0030] Fig. 9 It is a schematic diagram of the structure of the connection between the transmission member and the lower seat in one embodiment of the present invention;

[0031] Fig.10It is a structural schematic diagram of the connection between the adjustment device and the second drill bit in one embodiment of the present invention;

[0032] Fig.11 It is a schematic diagram of the structure in which a transmission member is connected to a second drill bit in one embodiment of the present invention;

[0033] Fig.12 It is a schematic structural diagram of a disc-shaped gear ring in one embodiment of the present invention;

[0034] Fig.13 It is a structural schematic diagram of the connection between the lower seat and the limiting mechanism in one embodiment of the present invention;

[0035] Fig.14 It is a schematic structural diagram of a cross-section of a limiting mechanism in one embodiment of the present invention;

[0036] Fig.15 It is a schematic diagram of the structure of the connection between the fixing member and the insertion end in one embodiment of the present invention;

[0037] Fig.16 Schematic diagram of the structure of a fixing member in one embodiment of the present invention.

[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, supporting 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 slot; 52, transmission member; 521, rotating disk; 522, annular gear ring; 523, disc-shaped gear 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 following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0040] See also Figure 1-16The present invention provides a technical solution: a drilling rig drill bit, comprising a connecting section 1 connected to the drilling rig and a mounting seat 2 arranged at the lower end of the connecting section 1 for mounting a drill bit, the drill bit comprising a first drill bit 3 fixed at the lower end of the mounting seat 2 and a second drill bit 4 movably arranged at an equal angle in the mounting seat 2, and further comprising:

[0041] An adjusting device 5, which is arranged on the mounting seat 2 and connected to the second drill bit 4, and is used to adjust the installation position of the second drill bit 4;

[0042] The regulating device 5 comprises:

[0043] A transmission member 52, disposed on the mounting base 2 and connected to the second drill bit 4;

[0044] The rotating member 51 is disposed on the mounting seat 2 and connected to 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, during operation, the connecting section 1 is fixed to the drill pipe of the drilling machine, the second drill bit 4 is installed at the set position of the mounting seat 2, and then the first drill bit 3 is fixed to the lower end of the mounting seat 2, and then the mounting seat 2 is installed at the lower end of the connecting section 1. After the first drill bit 3 and the second drill bit 4 are fixed, the drilling machine is turned on, and the first drill bit 3 and the second drill bit 4 are driven by the drill pipe to drill the ground. When the diameter of the wellbore to be drilled changes, the rotating member 51 can be 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 to the upper end to move on the mounting seat 2, thereby changing the extension distance of the second drill bit 4 on the mounting seat 2, and then adjusting the size of the wellbore drilled by the drilling rig; when the second drill bit 4 is worn, the transmission member 52 can be used to drive the second drill bit 4 to extend from the mounting seat 2 to compensate for the wear distance, so that the size of the wellbore drilled by the second drill bit 4 meets the design requirements; the adjustably set second drill bit 4 can be adjusted according to the design size of the wellbore, making the entire drilling rig drill bit more practical.

[0046] In one embodiment, the mounting seat 2 includes 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 to the lower seat 22 by a fixing bolt 23, the second drill bit 4 is adjustably arranged between the upper seat 21 and the lower seat 22, a positioning hole 2202 for installing the fixing bolt 23 is opened on the lower seat 22, a support ring 221 is arranged on the inner wall of the lower seat 22, a mounting groove 2102 for installing the fixing bolt 23 is opened on the upper seat 21, and the first drill bit 3 is threadedly connected to the lower seat 22.

[0047] This design, see Figure 1-7The mounting base 2 adopts a modular design of an upper base 21 and a lower base 22, which is easy to disassemble and replace, 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 a fixing bolt 23, ensuring the stability and rigidity of the mounting base 2. The second drill bit 4 is adjustably arranged between the upper base 21 and the lower base 22, so that the drill bit can be flexibly adjusted according to actual drilling needs. The positioning hole 2202 opened on the lower base 22 and the mounting groove 2102 opened on the upper base 21 provide precise positioning for the fixing bolt 23, ensuring a tight connection and accurate alignment between the upper base 21 and the lower base 22. The connecting section 1 is rotatably penetrated on the support ring 221, and the first drill bit 3 is threadedly connected to the lower base 22. 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 by simply rotating the first drill bit 3.

[0048] In one embodiment, a sliding block 41 is provided on one 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, and the second drill bit 4 extends out of the lower seat 22 by the same distance.

[0049] This design, see Fig.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 deflecting or shaking, ensuring that the second drill bit 4 drills according to a predetermined trajectory, thereby improving the accuracy and stability of drilling. The limiting groove 2101 on the upper seat 21 further limits the moving 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 arranged on the side of the insertion end 511 located 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 support ring 221.

[0051] This design, see Figure 9-11 ,as well as Fig.15The rotating member 51 is tightly connected to the lower seat 22 through the insertion end 511, ensuring stability during transmission. The rotating arrangement of the rotating shaft 512 in the support ring 221 further enhances the stability of transmission. The adjusting wrench is inserted into the interior of the insertion end 511, and then the gear 513 is driven to rotate, so that the rotating member 51 can mesh with the transmission member 52, so that the transmission member 52 can drive the second drill bit 4 to move on the lower seat 22, and then adjust the distance that the second drill bit 4 extends 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, thereby extending the service life of the rotating member 51.

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

[0053] This design, see Fig.11 ,as well as Figure 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, thereby avoiding loose or unstable connection caused by position deviation. The design of the limiting rod 53 and the limiting groove 51102 effectively prevents the insertion end 511 from accidentally falling off from the fixing groove 2201, thereby enhancing the reliability of the connection.

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

[0055] This design, see Figure 9-11The insertion end 511 rotates under the drive of the adjusting wrench, thereby causing the rotating shaft 512 to rotate inside the support ring 221. When the gear 513 rotates, it meshes with the annular gear ring 522, causing the rotating disk 521 to rotate inside the movable groove 2204, and the gear 513 is provided with a plurality of parts that can support the rotating disk 521. The disc-shaped gear 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 during the rotation process, thereby driving the second drill bit 4 to move at the upper end of the lower seat 22. The meshing connection between the annular gear ring 522 and the gear 513, and the meshing connection between the disc-shaped gear 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 bearing capacity, which is convenient for adjusting the position of the second drill bit 4 and makes the second drill bit 4 more stable during drilling.

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

[0057] This design, see Fig.13 The limiting mechanism 54 can ensure that the connection between the insertion end 511 and the lower seat 22 is more stable, and prevent loosening or falling off due to vibration, impact or other external factors. This stable connection is crucial for the stable operation of the drilling rig in harsh working environments (such as when the drill bit is drilling a hole in a relatively solid ground, the drill bit is subjected to greater torsional stress, causing the connection between the drill bit and the connector to be subjected to greater stress). The stable connection reduces the safety accidents that may be caused by loosening or falling off of components, and ensures the safety of operators.

[0058] In one embodiment, the limiting mechanism 54 includes an extrusion block 541 arranged in a trapezoidal shape in the insertion end 511, a support member arranged on the side of the extrusion block 541 close to the support ring 221, and a fixing member 543 arranged on both sides of the extrusion block 541 for fixing the insertion end 511. The fixing member 543 is symmetrically arranged with respect to the extrusion block 541, and an insertion port 51101 is opened on the insertion end 511 for the extrusion block 541 to move.

[0059] This design, see Figure 13-16, insert the adjusting wrench into the insertion port 51101, and then push the squeezing block 541 to move toward the side close to the support ring 221. The squeezing block 541 adopts a trapezoidal design, and can drive the fixing member 543 to move inside the insertion end 511 during the movement, and then contact the restriction of the fixing member 543 on the insertion end 511. At this time, the adjusting wrench can be rotated, so that the insertion end 511 rotates inside the lower seat 22. When the extension length of the second drill bit 4 is adjusted, the adjusting wrench is pulled out of the insertion port 51101, and then the squeezing block 541 is reset, and then the fixing member 543 is driven to be clamped and fixed in the lower seat 22 to fix the position of the insertion end 511. The limiting mechanism 54 improves the stability of the second drill bit 4 and reduces the stress of the second drill bit 4 when the torsional stress is large, which drives the transmission member 52 to rotate, thereby changing the installation position of the second drill bit 4. The stable connection can reduce equipment failures and downtime caused by loose connection or large stress, thereby extending the service life of the equipment.

[0060] In one embodiment, the support member includes a moving rod 542 fixed on the extrusion block 541 and inserted in the insertion end 511, and a second elastic member 544 sleeved on the moving rod 542. The insertion end 511 is provided with a hollow groove 51301 for the moving rod 542 to move and connected to the insertion port 51101. The second elastic member 544 is made of a damped spring or elastic pad.

[0061] This design, see Figure 14-16 The moving rod 542 is fixed on the extrusion block 541 and inserted into the insertion end 511, providing a stable support for the extrusion block 541. Under the extrusion of the adjusting wrench, the extrusion block 541 drives the moving rod 542 to move in the empty groove 51301, so that the extrusion block 541 squeezes the second elastic member 544. When the adjusting wrench is taken out from the insertion port 51101, the second elastic member 544 can drive the extrusion block 541 to reset, so that the extrusion block 541 drives 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 passed through the insertion end 511, a pushing block 5431 arranged on the side of the fixing rod 5432 close to the extrusion block 541, and a first elastic member 5433 sleeved on the fixing rod 5432. A slot 51301 is provided at a 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, see Figure 14-16 The fixing rod 5432 is passed through the insertion end 511 and fixedly connected to the lower seat 22 through the fixing hole 2205. This design can ensure that the connection between the insertion end 511 and the lower seat 22 is stable and reliable, and is not easy to loosen or fall off due to external force. The first elastic member 5433 is sleeved on the fixing rod 5432. The first elastic member 5433 is compressed to generate elastic force and is located between the pushing block 5431 and the empty groove 51301. When the extrusion block 541 moves to one side of the support ring 221, the first elastic member 5433 can drive the pushing block 543 1 move towards each other, so that the fixing rod 5432 is pulled out from the fixing hole 2205. At this time, the insertion end 511 can be driven to rotate inside the fixing groove 2201 by adjusting the wrench. After the position of the second drill bit 4 is adjusted, the extrusion block 541 is pulled out from the insertion port 51101, and then the extrusion block 541 can move away from one side of the support ring 221, thereby pushing the pushing block 5431 to move away from each other, so that the fixing rod 5432 is inserted into the fixing hole 2205, and the fixing rod 5432 is fixed on the lower seat 22.

[0064] In addition, if there are descriptions involving "first", "second", etc. in the embodiments, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying the importance of the relative description or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

Claims

1. A drilling rig drill bit, comprising a connecting section (1) connected to a drilling rig and a mounting seat (2) arranged at the lower end of the connecting section (1) for mounting a drill bit, the drill bit comprising a first drill bit (3) fixed to the lower end of the mounting seat (2) and a second drill bit (4) movably arranged at an equal angle in the mounting seat (2), characterized in that: Also includes: an adjusting device (5), arranged on the mounting seat (2) and connected to the second drill bit (4), and used for adjusting the mounting position of the second drill bit (4); The regulating device (5) comprises: A transmission member (52) is arranged on the mounting seat (2) and connected to the second drill bit (4); A rotating member (51) is arranged on the mounting seat (2) and is connected to the transmission member (52) and is used to adjust the length of the second drill bit (4) extending out of the mounting seat (2).

2. The drilling rig drill bit according to claim 1, characterized in that: 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 to the lower seat (22) by a fixing bolt (23); the second drill bit (4) is adjustably arranged between the upper seat (21) and the lower seat (22); a positioning hole (2202) for installing the fixing bolt (23) is provided on the lower seat (22); a supporting ring (221) is provided on the inner wall of the lower seat (22); and a mounting groove (2102) for installing the fixing bolt (23) is provided on the upper seat (21).

3. The drilling rig drill bit according to claim 2, characterized in that: A sliding block (41) is provided on one 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); a limiting groove (2101) for the sliding block (41) to move is provided on the upper seat (21); and the second drill bit (4) extends out of the lower seat (22) by the same distance.

4. The drilling rig drill bit according to claim 3, characterized in that: The rotating member (51) comprises an insertion end (511) inserted into the lower seat (22), a rotating shaft (512) arranged on one 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 arranged in the support ring (221).

5. The drilling rig drill bit according to claim 4, characterized in that: A fixing groove (2201) is provided at a position of the lower seat (22) corresponding to the insertion end (511), a limiting rod (53) is provided at a position where the fixing groove (2201) is connected to the insertion end (511), and a limiting groove (51102) is provided at a position of the insertion end (511) corresponding to the limiting rod (53).

6. The drilling rig drill bit according to claim 4, characterized in that: The transmission member (52) comprises a rotating disk (521) arranged between the supporting ring (221) and the positioning hole (2202), an annular toothed ring (522) arranged at the lower end of the rotating disk (521) and meshingly connected with the gear (513), and a disc-shaped toothed ring (523) arranged at the upper end of the rotating disk (521) and connected to the sliding block (41), a tooth groove (4101) meshingly connected with the disc-shaped toothed ring (523) is provided at the lower end of the sliding block (41) at a position corresponding to the disc-shaped toothed ring (523), and a moving groove (2204) for the rotating disk (521) to move is provided at a position corresponding to the rotating disk (521).

7. The drilling rig drill bit according to claim 4, characterized in that: A limiting mechanism (54) for fixedly connecting the insertion end (511) and the lower seat (22) is provided inside the insertion end (511).

8. The drilling rig drill bit according to claim 7, characterized in that: The limiting mechanism (54) comprises an extrusion block (541) arranged in a trapezoidal shape in the insertion end (511), a support member arranged on the side of the extrusion block (541) close to the support ring (221), and fixing members (543) arranged on both sides of the extrusion block (541) for fixing the insertion end (511), the fixing members (543) are symmetrically arranged with respect to the extrusion block (541), and an insertion port (51101) for the extrusion block (541) to move is opened on the insertion end (511).

9. The drilling rig drill bit according to claim 8, characterized in that: The support member includes a moving rod (542) fixed on the extrusion block (541) and inserted in the insertion end (511) and a second elastic member (544) sleeved on the moving rod (542), and an empty groove (51301) for the moving rod (542) to move and connected to the insertion port (51101) is opened on the insertion end (511).

10. The drilling rig drill bit according to claim 9, characterized in that: The fixing member (543) includes a fixing rod (5432) inserted through the insertion end (511), a pushing block (5431) arranged on the side of the fixing rod (5432) close to the extrusion block (541), and a first elastic member (5433) sleeved on the fixing rod (5432); a slot (51301) is provided at a 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); and a fixing hole (2205) for fixing the fixing rod (5432) is provided on the lower seat (22).

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