Twist drill having adjustable mounting structure

Abstract

The application relates to the technical field of drilling, in particular to a twist drill bit with an adjustable mounting structure, which comprises a power transmission shaft, the end of the power transmission shaft is fixedly connected with a mounting base, the inner wall of the mounting base is rotationally installed with a second rotating ring, the second rotating ring is fixedly connected with a screwing ring seat, the outer wall of the screwing ring seat is rotationally sleeved with a front-end metal ring sleeve, the outer wall of the front-end metal ring sleeve is fixedly connected with a cooling liquid buffer frame, the second rotating ball moves up and down along the circumferential sliding of the inclined surface, at the moment, the second rotating ball moves up and down synchronously with the guide rod, the first rotating ball and the guide cover, the guide cover swings back and forth around the rotating rod, the reciprocating opening and closing are realized, at the moment, the cooling liquid sprayed outwards from the fixed pipe is guided by the reciprocating opening and closing direction of the guide cover, and is sprayed to different height positions of the twist drill bit body to realize cooling.

Description

Technical Field

[0001] This invention relates to the field of drilling technology, specifically to a twist drill bit with an adjustable mounting structure. Background Technology

[0002] In the field of machining, drilling is a basic process for forming holes in parts. It is widely used in the cutting of various metal and non-metal materials. The drilling quality and processing efficiency are directly related to the performance of the cutting tools. Among them, the twist drill bit is the core cutting tool, and its structural design directly determines the dimensional accuracy, surface roughness and chip removal effect of the hole.

[0003] Currently available twist drill bits typically use only double-sided groove clamping and limiting during installation, which can easily cause shaking during drilling. Severe shaking can lead to drill bit breakage. Existing twist drill bits usually use coaxial water spray cooling inside the drill bit for cooling, which usually only cools the tip of the drill bit. Other parts of the drill bit are still prone to overheating, which can lead to prolonged high temperatures in other parts of the drill bit and reduce its service life. Summary of the Invention

[0004] The purpose of this invention is to provide a twist drill bit with an adjustable mounting structure to solve the problems mentioned in the background art, such as the tendency for the drill bit to shake during drilling, which can easily lead to breakage when the shaking is severe, and the fact that coaxial water spray cooling can usually only cool the end of the drill bit, while other parts of the drill bit are still prone to overheating.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a twist drill bit with an adjustable mounting structure, comprising a power transmission shaft, an end of which is fixedly connected to a mounting base, a second rotating ring rotatably mounted on the inner wall of the mounting base, a screwing ring seat fixedly connected to the second rotating ring, a front-end metal ring sleeve rotatably fitted on the outer wall of the screwing ring seat, a coolant buffer frame fixedly connected to the outer wall of the front-end metal ring sleeve, an annular buffer chamber formed on the inner wall of the coolant buffer frame, two fixed pipes fixedly mounted on the inner wall of the annular buffer chamber, a fixed plate fixedly connected to the inner wall of the fixed pipes, a vortex fan rotatably mounted on the inner wall of the fixed plate, an abutment block fixedly connected to one end of the vortex fan, an abutment slope formed at the end of the abutment block, a plurality of annularly evenly distributed abutment protrusions fixedly connected to the outer wall of the abutment slope, the abutment protrusions being hemispherical protrusions, and a guide cover rotatably mounted on the outer wall of the fixed pipes.

[0006] Preferably, a fixing box is fixedly connected to the outer wall of the fixing tube, a rotating rod is rotatably installed on the inner wall of the fixing box, a guide cover is fixedly connected to the outer wall of the rotating rod, a torsion spring is sleeved on the rotating rod, one end of the torsion spring is fixedly connected to the inner wall of the fixing box, and the other end of the torsion spring is fixedly connected to the outer wall of the guide cover.

[0007] Preferably, a first rotating ball is rotatably mounted on the outer wall of the guide cover, a guide rod is fixedly connected to the outer wall of the first rotating ball, and a second rotating ball is rotatably mounted on one end of the guide rod. The second rotating ball can abut against multiple abutting protrusions.

[0008] Preferably, a limiting sleeve is fixedly connected to the inner wall of the mounting base, the limiting sleeve is fixedly connected to the screw ring seat, and a threaded rod is threadedly connected to the inner wall of the limiting sleeve, with one end of the threaded rod fixedly connected to the limiting base.

[0009] Preferably, the outer wall of the limiting base is provided with multiple limiting grooves, and the inner wall of each of the multiple limiting grooves is slidably installed with a sliding gripper for limiting the position of the triangular assembly handle, and the outer wall of the sliding gripper is fixedly connected with a limiting protrusion.

[0010] Preferably, the plurality of sliding jaws are slidably connected to the inner wall of the screw ring seat, and the outer wall of the triangular assembly handle is provided with a plurality of limiting grooves.

[0011] Preferably, the end of the triangular assembly shank is fixedly connected to a twist drill bit body, the outer wall of the twist drill bit body is fixedly connected to a first transmission gear, the outer wall of the first transmission gear is meshed with a second transmission gear, and the second transmission gear is rotatably mounted on the outer wall of the coolant buffer frame.

[0012] Preferably, a first rotating ring is rotatably mounted on the outer wall of the coolant buffer frame, one side of the first rotating ring is located in the annular buffer chamber, a transmission gear ring is fixedly connected to the inner wall of the first rotating ring, the transmission gear ring meshes with a second transmission gear, and a fixing rod for limiting the position of the coolant buffer frame is fixedly connected to the outer wall of the coolant buffer frame.

[0013] Preferably, a high-pressure injection pipe is fixedly connected to the first rotating ring, the high-pressure injection pipe passes through the first rotating ring, and the first rotating ring is in communication with the annular buffer chamber.

[0014] Preferably, two movable scrapers are fixedly connected to the outer wall of the first rotating ring. The outer wall of the movable scraper is provided with multiple water-permeable holes. A cleaning brush is fixedly connected to the outer wall of the movable scraper. The outer contour of the cleaning brush matches the inner contour of the annular buffer chamber.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. In this invention, when the second rotating ball slides along the circumference of the contacting inclined plane, it moves up and down reciprocally. At this time, the second rotating ball, along with the guide rod, the first rotating ball, and the guide cover, moves up and down synchronously, causing the guide cover to swing back and forth around the rotating rod, thus opening and closing. At this time, the coolant sprayed outward from the fixed tube will be guided by the reciprocating opening and closing direction of the guide cover and sprayed towards different height positions of the twist drill bit body for cooling.

[0017] 2. In this invention, the coolant input through the high-pressure injection pipe can enter the annular buffer chamber evenly, reducing the impact on the local area of ​​the buffer chamber and reducing equipment vibration. When the first rotating ring rotates, it carries two moving scrapers to move in a circle. When the moving scrapers move, they carry cleaning brushes to scrub the inner wall of the annular buffer chamber, scraping off and agitating the coolant deposits that have settled on the inner wall of the annular buffer chamber, preventing the deposits from clogging the chamber.

[0018] 3. In this invention, the abutting protrusion will abut against the second rotating ball. At this time, the second rotating ball will vibrate up and down at a high frequency with a small amplitude, and the guide cover will also vibrate at a high frequency with a small amplitude. This will cause the sprayed coolant water column to vibrate and spray onto the twist drill bit body, which can clean the twist groove of the twist drill bit body and prevent the debris from being discharged poorly.

[0019] 4. In this invention, multiple sliding jaws with limiting protrusions are clamped into the limiting groove on the outer wall of the triangular assembly shank to complete the limiting clamping of the triangular assembly shank. Then, the screw seat is rotated to make the front end of the sliding jaws clamp the front end of the triangular assembly shank. The front and rear double-point three-sided clamping can effectively limit the shaking of the twist drill bit body and provide good stability for the vibration of the triangular assembly shank and the twist drill bit body. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the overall cross-sectional structure of the present invention;

[0022] Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A in the middle;

[0023] Figure 4 This is a schematic cross-sectional view of the coolant buffer frame structure of the present invention;

[0024] Figure 5 This is a schematic diagram of the overall side cross-sectional structure of the present invention;

[0025] Figure 6 This is a cross-sectional view of the coolant buffer frame of the present invention from another perspective;

[0026] Figure 7 This is a schematic diagram of the cross-sectional structure of the fixed tube of the present invention;

[0027] Figure 8 For the present invention Figure 7 Enlarged structural diagram at point B.

[0028] In the attached diagram, the components represented by each number are as follows:

[0029] 1. Drive shaft; 2. Mounting base; 3. Tightening ring seat; 4. Front metal ring; 5. Coolant buffer frame; 6. First rotating ring; 7. High-pressure injection pipe; 8. Limiting sleeve; 9. Threaded rod; 10. Limiting base; 11. Second rotating ring; 12. Triangular assembly handle; 13. Limiting groove; 14. Sliding jaw; 15. Limiting protrusion; 16. Limiting groove; 17. Moving scraper; 18. Water permeable hole; 19. Cleaning brush; 2 0. Fixed tube; 21. First transmission gear; 22. Twist drill bit body; 23. Second transmission gear; 24. Transmission gear ring; 25. Annular buffer chamber; 26. Fixed plate; 27. Vortex fan; 28. Abutting block; 29. ​​Abutting inclined surface; 30. Abutting protrusion; 31. Fixed box; 32. Rotating rod; 33. Torsion spring; 34. Guide cover; 35. First rotating ball; 36. Guide rod; 37. Second rotating ball; 38. Fixed rod. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] This invention provides a technical solution: such as Figures 1-8The twist drill bit shown has an adjustable mounting structure, including a power drive shaft 1. A mounting base 2 is fixedly connected to the end of the power drive shaft 1. A second rotating ring 11 is rotatably mounted on the inner wall of the mounting base 2. A screw ring seat 3 is fixedly connected to the second rotating ring 11. A front metal ring 4 is rotatably sleeved on the outer wall of the screw ring seat 3. A coolant buffer frame 5 is fixedly connected to the outer wall of the front metal ring 4. An annular buffer chamber 25 is opened on the inner wall of the coolant buffer frame 5. Two fixed pipes 20 are fixedly mounted on the inner wall of the annular buffer chamber 25. A fixed plate 26 is fixedly connected to the inner wall of the fixed pipes 20. A vortex fan 27 is rotatably mounted on the inner wall of the fixed plate 26. An abutment block 28 is fixedly connected to one end of the vortex fan 27. An abutment slope 29 is opened at the end of the abutment block 28. A plurality of annularly evenly distributed abutment protrusions 30 are fixedly connected to the outer wall of the abutment slope 29. The abutment protrusions 30 are set as hemispherical protrusions. A guide cover 34 is rotatably mounted on the outer wall of the fixed pipe 20.

[0032] A fixed box 31 is fixedly connected to the outer wall of the fixed tube 20. A rotating rod 32 is rotatably installed on the inner wall of the fixed box 31. A guide cover 34 is fixedly connected to the outer wall of the rotating rod 32. A torsion spring 33 is sleeved on the rotating rod 32. One end of the torsion spring 33 is fixedly connected to the inner wall of the fixed box 31, and the other end of the torsion spring 33 is fixedly connected to the outer wall of the guide cover 34.

[0033] A first rotating ball 35 is rotatably mounted on the outer wall of the guide cover 34. A guide rod 36 is fixedly connected to the outer wall of the first rotating ball 35. A second rotating ball 37 is rotatably mounted on one end of the guide rod 36. The second rotating ball 37 can abut against multiple abutting protrusions 30.

[0034] The inner wall of the mounting base 2 is fixedly connected to a limiting sleeve 8, which is fixedly connected to a screw ring seat 3. The inner wall of the limiting sleeve 8 is threadedly connected to a threaded rod 9, and one end of the threaded rod 9 is fixedly connected to a limiting base 10.

[0035] The outer wall of the limiting base 10 is provided with multiple limiting grooves 16. The inner wall of each limiting groove 16 is slidably fitted with a sliding gripper 14 for limiting the position of the triangular assembly shank 12. The outer wall of the sliding gripper 14 is fixedly connected with a limiting protrusion 15. The front end of the sliding gripper 14 clamps the front end of the triangular assembly shank 12. The front and rear double-point three-sided clamping can effectively limit the shaking of the twist drill body 22 and provide good stability for the vibration of the triangular assembly shank 12 and the twist drill body 22.

[0036] Multiple sliding jaws 14 are slidably connected to the inner wall of the screw ring seat 3, and multiple limiting grooves 13 are provided on the outer wall of the triangular assembly handle 12.

[0037] A twist drill bit body 22 is fixedly connected to the end of the triangular assembly shank 12. A first transmission gear 21 is fixedly connected to the outer wall of the twist drill bit body 22. A second transmission gear 23 is meshed with the outer wall of the first transmission gear 21. The second transmission gear 23 is rotatably mounted on the outer wall of the coolant buffer frame 5. A first rotating ring 6 is rotatably mounted on the outer wall of the coolant buffer frame 5. One side of the first rotating ring 6 is located inside the annular buffer chamber 25. A transmission gear ring 24 is fixedly connected to the inner wall of the first rotating ring 6. The transmission gear ring 24 meshes with the second transmission gear 23. A fixing rod 38 for limiting the position of the coolant buffer frame 5 is fixedly connected to the outer wall of the coolant buffer frame 5. It should be noted that the coolant buffer frame 5 does not participate in the rotation. One end of the fixing rod 38 is fixed to the outer wall of the coolant buffer frame 5, and the other end of the fixing rod 38 can be threaded onto the lifting mechanism of the drill body to limit the rotation of the coolant buffer frame 5. The frame 5 is connected to a coolant delivery hose. The power transmission shaft 1, which is connected to the output end of the drilling rig, drives the limiting sleeve 8 and the mounting base 2 to rotate. When the limiting sleeve 8 rotates, it drives the screw ring seat 3 to rotate synchronously. When the screw ring seat 3 rotates, it drives multiple sliding jaws 14 to rotate synchronously. The sliding jaws 14 clamp the triangular assembly shank 12 and the twist drill bit body 22 to rotate synchronously. When the twist drill bit body 22 rotates, the first transmission gear 21 fixed on its outer wall abuts against the second transmission gear 23, causing the second transmission gear 23 to rotate on the coolant buffer frame 5. When the second transmission gear 23 rotates, it meshes with the transmission gear ring 24, causing the transmission gear ring 24 to rotate. The rotation of the transmission gear ring 24 drives the first rotating ring 6 to rotate synchronously. When the first rotating ring 6 rotates, it drives the high-pressure injection pipe 7 to rotate, so that the coolant delivered by the high-pressure injection pipe 7 can enter the annular buffer chamber 25 evenly, reducing the impact on a single position of the annular buffer chamber 25 and preventing vibration.

[0038] A high-pressure injection pipe 7 is fixedly connected to the first rotating ring 6. The high-pressure injection pipe 7 passes through the first rotating ring 6, and the first rotating ring 6 is in communication with the annular buffer chamber 25.

[0039] Two movable scrapers 17 are fixedly connected to the outer wall of the first rotating ring 6. Multiple water-permeable holes 18 are opened through the outer wall of the movable scraper 17. A cleaning brush 19 is fixedly connected to the outer wall of the movable scraper 17. The outer contour of the cleaning brush 19 matches the inner contour of the annular buffer chamber 25.

[0040] Working principle: When using this adjustable twist drill bit, to install the twist drill bit body 22, first, place one end of the triangular mounting shank 12 against the inner wall of the limiting base 10, hold the fixed front metal ring 4, and rotate the screw ring seat 3 with the other hand. When the screw ring seat 3 rotates, it causes multiple sliding jaws 14 to rotate synchronously. Since the sliding jaws 14 are inside the limiting base 10, when the sliding jaws 14 rotate, they cause the limiting base 10 to rotate synchronously. When the limiting base 10 rotates, it causes the threaded rod 9 to rotate synchronously. When the threaded rod 9 rotates along the limiting sleeve 8, it triggers the threaded connection, causing the threaded rod 9 to move the limiting base 10 away from the limiting sleeve 8. When the limiting base 10 moves, it abuts against multiple sliding jaws 14 and moves synchronously, causing multiple sliding jaws to rotate synchronously. The movable jaw 14 moves forward along the inner wall of the front metal ring 4. Since the inner wall of the front metal ring 4 is set as a truncated cone inner contour, as the sliding jaw 14 moves forward, it causes multiple sliding jaws 14 to move closer to each other until the triangular assembly shank 12 is about to be clamped. Then, the angle of the triangular assembly shank 12 is slightly adjusted so that multiple sliding jaws 14 with limiting protrusions 15 are clamped into the limiting grooves 13 on the outer wall of the triangular assembly shank 12, thus completing the limiting clamping of the triangular assembly shank 12. Then, the screw seat 3 is rotated to make the front end of the sliding jaw 14 clamp the front end of the triangular assembly shank 12. The front and rear double-point three-sided clamping can effectively limit the shaking of the twist drill body 22 and provide good stability for the vibration of the triangular assembly shank 12 and the twist drill body 22.

[0041] After installation, when drilling, it is important to note that the coolant buffer frame 5 does not rotate. One end of the fixing rod 38 is fixed to the outer wall of the coolant buffer frame 5, and the other end of the fixing rod 38 can be threaded onto the lifting mechanism of the drill body to limit the rotation of the coolant buffer frame 5. The coolant buffer frame 5 is connected to a coolant delivery hose. The power transmission shaft 1 connected to the output end of the drill drives the limiting sleeve 8 and the mounting base 2 to rotate. When the limiting sleeve 8 rotates, it drives the turning ring seat 3 to rotate synchronously. When the turning ring seat 3 rotates, it drives multiple sliding jaws 14 to rotate synchronously. The sliding jaws 14 clamp the triangular assembly shank 12 and the twist drill bit body 22 to rotate synchronously. When the twist drill bit body 22 rotates, the first transmission gear 21 and the second transmission gear fixed on its outer wall... When wheel 23 comes into contact, it causes the second transmission gear 23 to rotate on the coolant buffer frame 5. When the second transmission gear 23 rotates, it meshes with the transmission gear ring 24, causing the transmission gear ring 24 to rotate. The rotation of the transmission gear ring 24 causes the first rotating ring 6 to rotate synchronously. When the first rotating ring 6 rotates, it causes the high-pressure injection pipe 7 to rotate, so that the coolant delivered by the high-pressure injection pipe 7 can enter the annular buffer chamber 25 evenly, reducing the impact on a single position of the annular buffer chamber 25 and preventing vibration. When the first rotating ring 6 rotates, it causes two moving scrapers 17 to move in a circle. When the moving scrapers 17 move, they will bring the cleaning brush 19 to scrape the inner wall of the annular buffer chamber 25, scraping off and agitating the coolant deposits that have settled on the inner wall of the annular buffer chamber 25, preventing the deposits from clogging the chamber.

[0042] Once the coolant in the annular buffer chamber 25 reaches a certain level, it can be discharged outward through the fixed pipe 20. During the discharge process, the vortex fan 27 will rotate. When the vortex fan 27 rotates, the contact block 28 will rotate synchronously. When the contact block 28 rotates, the second rotating ball 37 will slide along the surface of the contact inclined surface 29. Since the contact inclined surface 29 is an inclined surface, when the second rotating ball 37 slides along the circumference of the inclined surface, it will move up and down simultaneously. At this time, the second rotating ball 37, along with the guide rod 36, the first rotating ball 35, and the guide cover 34, will move up and down synchronously, causing the guide cover 34 to rotate with the rotating rod 32. The guide cover 34 is in a reciprocating opening and closing state. At this time, the coolant sprayed outward from the fixed pipe 20 will be guided by the reciprocating opening and closing direction of the guide cover 34 and sprayed towards different height positions of the twist drill bit body 22 for cooling.

[0043] Since the surface of the contact block 28 is also provided with multiple contact protrusions 30, the contact protrusions 30 will contact the second rotating ball 37. At this time, the second rotating ball 37 will vibrate up and down at a high frequency with a small amplitude, and the guide cover 34 will also vibrate at a high frequency with a small amplitude. This will cause the sprayed coolant water column to vibrate and spray onto the twist drill bit body 22, which can clean the twist groove of the twist drill bit body 22 and prevent the chip discharge from being obstructed.

[0044] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0045] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A twist drill bit with an adjustable mounting structure, comprising a power transmission shaft (1), characterized in that: A mounting base (2) is fixedly connected to the end of the power transmission shaft (1). A second rotating ring (11) is rotatably mounted on the inner wall of the mounting base (2). A screw ring seat (3) is fixedly connected to the second rotating ring (11). A front metal ring sleeve (4) is rotatably sleeved on the outer wall of the screw ring seat (3). A coolant buffer frame (5) is fixedly connected to the outer wall of the front metal ring sleeve (4). An annular buffer chamber (25) is opened on the inner wall of the coolant buffer frame (5). Two fixed... The inner wall of the fixed tube (20) is fixedly connected to a fixed plate (26), and a vortex fan (27) is rotatably installed on the inner wall of the fixed plate (26). One end of the vortex fan (27) is fixedly connected to an abutment block (28), and an abutment slope (29) is provided at the end of the abutment block (28). A plurality of annularly distributed abutment protrusions (30) are fixedly connected to the outer wall of the abutment slope (29). The abutment protrusions (30) are set as hemispherical protrusions. A guide cover (34) is rotatably installed on the outer wall of the fixed tube (20). A fixed box (31) is fixedly connected to the outer wall of the fixed tube (20). A rotating rod (32) is rotatably installed on the inner wall of the fixed box (31). A guide cover (34) is fixedly connected to the outer wall of the rotating rod (32). A torsion spring (33) is sleeved on the rotating rod (32). One end of the torsion spring (33) is fixedly connected to the inner wall of the fixed box (31), and the other end of the torsion spring (33) is fixedly connected to the outer wall of the guide cover (34). The outer wall of the guide cover (34) is rotatably mounted with a first rotating ball (35), and the outer wall of the first rotating ball (35) is fixedly connected with a guide rod (36). One end of the guide rod (36) is rotatably mounted with a second rotating ball (37), and the second rotating ball (37) can abut against multiple abutting protrusions (30). The inner wall of the mounting base (2) is fixedly connected to a limiting sleeve (8), the limiting sleeve (8) is fixedly connected to a screw ring seat (3), the inner wall of the limiting sleeve (8) is threadedly connected to a threaded rod (9), and one end of the threaded rod (9) is fixedly connected to a limiting base (10). The outer wall of the limiting base (10) is provided with multiple limiting grooves (16), and the inner wall of each of the multiple limiting grooves (16) is slidably installed with sliding claws (14) for limiting the position of the triangular assembly handle (12). The outer wall of the sliding claws (14) is fixedly connected with limiting protrusions (15). The end of the triangular assembly shank (12) is fixedly connected to the twist drill bit body (22), the outer wall of the twist drill bit body (22) is fixedly connected to the first transmission gear (21), the outer wall of the first transmission gear (21) is meshed with the second transmission gear (23), and the second transmission gear (23) is rotatably installed on the outer wall of the coolant buffer frame (5). The outer wall of the coolant buffer frame (5) is rotatably mounted with a first rotating ring (6), one side of the first rotating ring (6) is located in the annular buffer chamber (25), and the inner wall of the first rotating ring (6) is fixedly connected with a transmission gear ring (24). The transmission gear ring (24) meshes with the second transmission gear (23). The outer wall of the coolant buffer frame (5) is fixedly connected with a fixing rod (38) for limiting the position of the coolant buffer frame (5). A high-pressure injection pipe (7) is fixedly connected to the first rotating ring (6), the high-pressure injection pipe (7) passes through the first rotating ring (6), and the first rotating ring (6) is in communication with the annular buffer chamber (25).

2. A twist drill bit with an adjustable mounting structure according to claim 1, characterized in that: Multiple sliding jaws (14) are slidably connected to the inner wall of the screw ring seat (3), and multiple limiting grooves (13) are provided on the outer wall of the triangular assembly handle (12).

3. A twist drill bit with an adjustable mounting structure according to claim 1, characterized in that: Two movable scrapers (17) are fixedly connected to the outer wall of the first rotating ring (6). Multiple water-permeable holes (18) are opened through the outer wall of the movable scraper (17). A cleaning brush (19) is fixedly connected to the outer wall of the movable scraper (17). The outer contour of the cleaning brush (19) matches the inner contour of the annular buffer chamber (25).

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