Drill bit replacing device suitable for well drilling

Abstract

The utility model provides a drill bit replacing device suitable for well drilling, which comprises a drill rod body, and a centering sleeve block is fixedly arranged in the drill rod body; a centering rod is fixedly arranged at the top of the drill bit body, the centering sleeve block is arranged on the centering rod in a sleeving mode, and the centering sleeve block can drive the centering rod to rotate synchronously; a butt joint plate is further fixedly arranged on the circumferential face of the centering rod. The clamping and fixing mechanism comprises at least two curved clamping rods, a movable extrusion module and a driving source, the at least two curved clamping rods are arranged at intervals in the circumferential direction of the drill rod body, the middle of each curved clamping rod is hinged to the inner wall of the drill rod body, and the upper end of each curved clamping rod makes contact with the movable extrusion module; the lower end of the curved clamping rod makes contact with the bottom face of the butt joint plate, and the driving source can drive the movable extrusion module to move up and down. Based on vertical movement of the movable extrusion module, the lower end of the curved clamping rod can upwards push the butt joint plate or downwards move to be away from the butt joint plate. The problem that a drill bit and a drill rod are inconvenient to disassemble and assemble in the prior art is solved.

Description

Technical Field

[0001] This utility model relates to the field of marine drilling equipment technology, and in particular to a drill bit replacement device suitable for drilling. Background Technology

[0002] Offshore drilling technology is a drilling operation technology used for the exploration and development of resources such as oil and natural gas in marine areas. Offshore drilling technology is a high-end technology that needs to cope with harsh marine environments and high-pressure and high-temperature formations, so the overall cost is very high. The drill bit is one of the important components in drilling operations. It is driven by a power source to drive the drill pipe, and then the drill pipe drives the drill bit to carry out drilling operations.

[0003] Drill bits are subject to corrosion and wear during operation, so they need to be replaced regularly to ensure the normal operation of drilling. The drill bit is fixed to the drill pipe. The drill bit is usually fixed to the drill pipe using a common threaded connection. There is also an internal locking connection that combines threads and grooves. In this case, a threaded post is set on the drill bit, and an internal threaded area is set on the drill pipe. The two are connected by threads. When the threads are tightened, the drill bit fits tightly against the drill pipe to achieve a seal. Although this connection method is stable, it is inconvenient to disassemble.

[0004] Therefore, how to provide a drill bit replacement device for marine drilling is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a drill bit replacement device suitable for drilling, so as to solve the problem of inconvenient disassembly and assembly between drill bit and drill pipe in the prior art.

[0006] To achieve the above and other related objectives, this utility model provides a drill bit replacement device suitable for drilling, comprising a drill pipe body, wherein a centering block is fixedly installed inside the drill pipe body; a drill bit body, wherein a centering rod is fixedly installed on the top of the drill bit body, the centering block is sleeved on the centering rod, and the centering block can drive the centering rod to rotate synchronously; a docking plate is also fixedly installed on the circumferential surface of the centering rod; and a clamping and fixing mechanism is disposed inside the drill pipe body, the clamping and fixing mechanism comprising at least two curved clamping rods, a movable extrusion module, and a drive source. The at least two curved clamping rods are spaced apart along the circumferential direction of the drill pipe body, and the middle part of each curved clamping rod is hinged to the inner wall of the drill pipe body. The upper end of the curved clamping rod is in contact with the movable extrusion module, and the lower end of the curved clamping rod is in contact with the bottom surface of the docking plate. The driving source can drive the movable extrusion module to move up and down. Based on the up and down movement of the movable extrusion module, the lower end of the curved clamping rod can push the docking plate upward, or the lower end of the curved clamping rod can move downward away from the docking plate.

[0007] Furthermore, the movable extrusion module includes a movable sleeve, an extrusion ring, an internally threaded tube, and a drive screw. The movable sleeve is sleeved on the centering sleeve and the centering sleeve can restrict the movable sleeve from rotating relative to it. The extrusion ring is fixedly disposed on the circumferential surface of the movable sleeve and contacts the upper end of the curved clamping rod. The internally threaded tube is fixedly disposed on the top of the movable sleeve. The first end of the drive screw is rotatably connected to the top of the centering sleeve, and the second end of the drive screw extends upward through the movable sleeve and is threadedly connected to the internally threaded tube and is connected to the drive source for transmission. The drive source is used to drive the drive screw to rotate.

[0008] Furthermore, the outer diameter of the extrusion ring gradually increases from top to bottom.

[0009] Furthermore, the centering sleeve is square in shape, and the movable sleeve is provided with a square hole that matches the shape of the centering sleeve.

[0010] Furthermore, the centering rod is square, and the centering sleeve has a square hole that matches the centering rod.

[0011] Furthermore, the curved clamping rod includes a first rod segment and a second rod segment, with a set angle between the first rod segment and the second rod segment, and the connection between the first rod segment and the second rod segment is hinged to the inner wall of the drill rod body.

[0012] Furthermore, the included angle between the first segment and the second segment is 120° to 150°.

[0013] Furthermore, a sealing assembly is provided at the connection between the drill pipe body and the drill bit body. The sealing assembly includes an annular sealing seat, a sealing groove, and a sealing ring fixedly connected to the top of the drill bit body. The sealing groove is opened at the bottom of the drill pipe body, the annular sealing seat is engaged in the sealing groove, and the sealing ring is sandwiched between the annular sealing seat and the sealing groove.

[0014] Furthermore, the drill pipe body is also provided with a positioning mechanism, which can position the drill bit body to prevent the drill bit body from moving relative to the drill pipe body.

[0015] Furthermore, the positioning mechanism includes a fixed cylinder, a movable rod, a chuck, and a spring. The fixed cylinder is fixedly connected to the inner wall of the drill rod body. The movable rod is movably connected to the inside of the fixed cylinder, with its first end extending to the outside of the fixed cylinder. The chuck is fixedly connected to the first end of the movable rod. The spring is sleeved on the movable rod, with one end of the spring contacting the chuck and the other end of the spring contacting the fixed cylinder. The side of the docking plate is provided with a positioning block protruding to the side. The upper and lower surfaces of the positioning block are both inclined, and the upper and lower surfaces of the chuck are also inclined.

[0016] As described above, the drill bit replacement device of this utility model, applicable to drilling, has the following beneficial effects: When the drill bit body is fixedly connected to the drill pipe body, the centering rod on the drill bit body is first aligned with the centering sleeve 11 on the drill pipe body to achieve centering and preliminary positioning of the drill bit body. Then, the movable extrusion module is driven upward by the drive source to move upward a certain distance. Since the movable extrusion module is in contact with the upper end of the curved clamping rod, and the middle part of the curved clamping rod is hinged to the inner wall of the drill pipe body, the movable extrusion module will extrude the curved clamping rod when it moves upward. When the upper end of the drill bit rotates outward, the lower end of the curved clamping rod rotates inward, pressing against the bottom surface of the docking plate and pushing it upward. This, through the compression of the curved clamping rod by the movable compression module, clamps and fixes the docking plate, i.e., the drill bit body. When the drill bit body needs to be disassembled, the movable compression module is driven downward a certain distance by the drive source, causing it to stop compressing the curved clamping rod outward. As the drill bit body moves downward under its own weight, the lower end of the curved clamping rod is pushed outward by the docking plate, quickly disassembling the drill bit body. In summary, the drill bit replacement device of this invention enables rapid clamping and disassembly of the drill bit body. Its operation is simple and convenient, greatly improving the ease and efficiency of drill bit body replacement. It solves the problem in the prior art where drill bits are generally connected to the drill rod via a threaded connection, making disassembly and replacement inconvenient. Attached Figure Description

[0017] Figure 1 The diagram shown is a three-dimensional structural schematic of the drill bit replacement device for drilling provided by this utility model.

[0018] Figure 2 The diagram shown is a partial structural schematic of the drill bit replacement device for drilling provided by this utility model.

[0019] Figure 3 The diagram shown is a partial structural schematic of the drill bit replacement device for drilling provided by this utility model.

[0020] Figure 4 The present invention is shown to provide Figure 3 Enlarged view of point A in the middle.

[0021] Figure 5 The present invention is provided with Figure 2 A cross-sectional schematic diagram.

[0022] Figure 6 The present invention is shown to provide Figure 1 A schematic diagram of the first cross section.

[0023] Figure 7 The present invention is provided with Figure 6 Enlarged view of point B in the middle.

[0024] Figure 8 The present invention is provided with Figure 6 A magnified view of point C in the middle.

[0025] Figure 9 The present invention is shown to provide Figure 1 A schematic diagram of the second cross section.

[0026] Figure 10 The present invention is shown to provide Figure 9 Enlarged view of point D in the middle.

[0027] Explanation of reference numerals in the attached figures

[0028] 10 Drill pipe body 11 Centering block

[0029] 110 Square Hole 101 Protective Cover Plate

[0030] 20 Drill bit body 21 Centering rod

[0031] 22. Docking plate; 30. Clamping and fixing mechanism

[0032] 31 Curved Clamping Rod 311 First Section

[0033] 312 Second segment 32 Movable extrusion module

[0034] 321 Movable sleeve 322 Extrusion ring

[0035] 323 Internally threaded pipe; 324 Drive screw

[0036] 33 Driver source 331 Cable

[0037] 40 Sealing assembly 41 Annular sealing seat

[0038] 42 Sealing groove 43 Sealing ring

[0039] 50 Positioning mechanism 51 Fixed cylinder

[0040] 52 Movable lever 53 Clip head

[0041] 54 Spring 221 Positioning Block Detailed Implementation

[0042] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model.

[0043] In the description of this utility model, it should be noted that, unless otherwise specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or a connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0044] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0045] Please see Figures 1 to 10 It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of this utility model. Therefore, the drawings only show the components related to this utility model and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0046] This utility model provides a drill bit replacement device suitable for drilling, such as... Figures 1 to 10 As shown, the replacement device includes a drill pipe body 10, a drill bit body 20, and a clamping and fixing mechanism 30. A centering sleeve 11 is fixedly installed inside the drill pipe body 10, and a centering rod 21 is fixedly installed on the top of the drill bit body 20. The centering sleeve 11 is fitted onto the centering rod 21 and can drive the centering rod 21 to rotate synchronously. A mating plate 22 is also fixedly installed on the circumferential surface of the centering rod 21. The clamping and fixing mechanism 30 is located inside the drill pipe body 10 and includes at least two curved clamping rods 31, a movable extrusion module 32, and a drive source 33. Two curved clamping rods 31 are spaced apart along the circumferential direction of the drill pipe body 10, and the middle part of each curved clamping rod 31 is hinged to the inner wall of the drill pipe body 10. Specifically, the upper end of the curved clamping rod 31 is in contact with the movable extrusion module 32, and the lower end of the curved clamping rod 31 is in contact with the bottom surface of the docking plate 22. The drive source 33 can drive the movable extrusion module 32 to move up and down. Based on the up and down movement of the movable extrusion module 32, the lower end of the curved clamping rod 31 can push the docking plate 22 upward, or the lower end of the curved clamping rod 31 can move downward to move away from the docking plate 22.

[0047] The beneficial effects of this utility model's drill bit replacement device for drilling are as follows: When the drill bit body 20 is fixedly connected to the drill pipe body 10, the centering rod 21 on the drill bit body 20 is first aligned with the centering sleeve 11 on the drill pipe body 10 to achieve centering and initial positioning of the drill bit body 20. Then, the movable extrusion module 32 is driven upward by the drive source 33 to move upward a certain distance. Since the movable extrusion module 32 is in contact with the upper end of the curved clamping rod 31, and the middle part of the curved clamping rod 31 is hinged to the inner wall of the drill pipe body 10, when the movable extrusion module 32 moves upward, it will extrude the upper end of the curved clamping rod 31 to rotate outward, and the lower end of the curved clamping rod 31 will rotate outward accordingly. The internal rotation will then push the bottom surface of the docking plate 22 upwards. Since the docking plate 22 is fixedly mounted on the centering rod 21, which is fixedly mounted on the drill bit body 20, the curved clamping rod 31 is clamped and fixed by the curved clamping rod 31 through the compression of the movable extrusion module 32. When it is necessary to disassemble the drill bit body 20, the movable extrusion module 32 is driven downwards by the drive source to move downwards a certain distance, so that the movable extrusion module 32 no longer extrudes the curved clamping rod 31 outwards. As a result, the lower end of the curved clamping rod 31 will be squeezed outwards by the docking plate 22 when the drill bit body 20 moves downwards by its own weight, thus quickly disassembling the drill bit body 20. In summary, the drill bit replacement device of this utility model can quickly clamp and disassemble the drill bit body, and the operation is simple and convenient. This greatly improves the convenience and efficiency of drill bit body replacement, and solves the problem that drill bits are generally connected to the drill rod by a threaded connection in the prior art, which makes it inconvenient to disassemble and replace the drill bit.

[0048] Furthermore, such as Figure 2 and Figure 5 As shown, in this embodiment, the centering rod 21 is square, and correspondingly, the centering sleeve 11 is provided with a square hole 110 that matches the centering rod 21. With this configuration, when the drill bit body 20 and the drill pipe body 10 are connected, the centering sleeve 11 is fitted onto the square centering rod 21, so that the centering sleeve 11 and the centering rod 21 will not rotate relative to each other. Therefore, during drilling operations, the rotation of the drill pipe body 10 will cause the centering sleeve 11 to rotate together, which in turn will cause the centering rod 21 to rotate together, and in turn, the centering rod 21 will cause the drill bit body 20 to rotate together.

[0049] Furthermore, such as Figures 9 to 10As shown, in this embodiment, the movable extrusion module 32 includes a movable sleeve 321, an extrusion ring 322, an internally threaded tube 323, and a drive screw 324. The movable sleeve 321 is sleeved on the centering sleeve 11, and the centering sleeve 11 restricts the movable sleeve 321 from rotating relative to the centering sleeve 11. The extrusion ring 322 is fixedly disposed on the circumferential surface of the movable sleeve 321 and contacts the upper end of the curved clamping rod 31. The internally threaded tube 323 is fixedly disposed on the top of the movable sleeve 321. The first end of the drive screw 324 is rotatably connected to the top of the centering sleeve 11, and the second end of the drive screw 324 extends upward through the movable sleeve 321 and is threadedly connected to the internally threaded tube 323. The second end of the drive screw 324 is also connected to the drive source 33, which drives the drive screw 324 to rotate. When it is necessary to clamp and fix the drill bit body 20, such as... Figure 9 and Figure 10 As shown, the drive screw 324 can be driven to rotate clockwise (or counterclockwise) by the drive source 33. When the drive screw 324 rotates, the internal threaded tube 323 will move upward along the drive screw 324. Since the internal threaded tube 323 is fixedly mounted on the movable sleeve 321, the internal threaded tube 323 will drive the movable sleeve 321 to move upward together. Consequently, the extrusion ring 322 fixedly mounted on the circumference of the movable sleeve 321 will also move upward, and the extrusion ring 322 will extrude outward to press the curved clamp. At the upper end of rod 31, the lower end of the corresponding curved clamping rod 31 will press against the bottom surface of the docking plate 22 and push the docking plate 22 upward. After the extrusion ring 322 moves upward a certain distance, the docking plate 22 is completely clamped, that is, when the extrusion ring 322 can no longer move upward, the drive source 33 is turned off, thus completing the clamping and fixing of the docking plate 22, i.e., the drill bit body 20. When it is necessary to disassemble the drill bit body 20, it is only necessary to drive the drive screw 324 to rotate in the opposite direction through the drive source 33, which will not be described in detail here.

[0050] Specifically, such as Figure 9 As shown, in this embodiment, the drive source 33 is a motor, which is built into the drill pipe body 10. A cable 331 is connected to the motor. Correspondingly, a through hole is provided on the side wall of the drill pipe body 10, and a protective cover plate 101 is provided on this through hole. When in use, the protective cover plate 101 is removed, thereby connecting the cable 331 to an external power source to supply power to the motor. Specifically, the connection between the protective cover plate 101 and the drill pipe body 10 is waterproofed to prevent seawater from penetrating into the drill pipe body during offshore drilling operations.

[0051] Furthermore, such as Figure 10As shown, in this embodiment, the extrusion ring 322 is tapered, meaning its outer diameter gradually increases from top to bottom. This design allows the extrusion ring 322 to move upwards more smoothly when it extrudes the curved clamping rod 31, thus improving the stability and effectiveness of the movable extrusion module 32.

[0052] Furthermore, in this embodiment, the centering sleeve 11 is square in shape, and the movable sleeve 321 is provided with a square hole that matches the shape of the centering sleeve 11. Therefore, the movable sleeve 321 is sleeved and connected to the centering sleeve 11, and the centering sleeve 11 and the movable sleeve 321 will not rotate relative to each other.

[0053] Furthermore, such as Figure 5 As shown, in this embodiment, the curved clamping rod 31 includes a first rod segment 311 and a second rod segment 312. The first rod segment 311 and the second rod segment 312 have a set included angle, meaning the curved clamping rod 31 is "L"-shaped. The connection between the first rod segment 311 and the second rod segment 312 is hinged to the inner wall of the drill pipe body 10. Preferably, in this embodiment, the included angle between the first rod segment 311 and the second rod segment 312 is 120° to 150°.

[0054] Furthermore, such as Figure 6 and Figure 8 As shown, in this embodiment, a sealing assembly 40 is also provided at the connection between the drill pipe body 10 and the drill bit body 20. Specifically, the sealing assembly 40 includes an annular sealing seat 41, a sealing groove 42, and a sealing ring 43 fixedly connected to the top of the drill bit body 20. The sealing groove 42 is located at the bottom of the drill pipe body 10, the annular sealing seat 41 is engaged within the sealing groove 42, and the sealing ring 43 is sandwiched between the annular sealing seat 41 and the sealing groove 42. This sealing assembly design significantly improves the sealing performance of the connection between the drill bit body 20 and the drill pipe body 10.

[0055] Furthermore, in order to improve the convenience of clamping and fixing the drill bit body 20, that is, to avoid the need to maintain the position of the drill bit body relative to the drill rod body with external tools before clamping and fixing, it is preferable that, in this embodiment, a positioning mechanism 50 is also provided inside the drill rod body 10. The positioning mechanism 50 can position the drill bit body 20 to prevent the drill bit body 20 from moving relative to the drill rod body 10.

[0056] Furthermore, such as Figures 3-4 and Figures 6-7As shown, in this embodiment, the positioning mechanism 50 includes a fixed cylinder 51, a movable rod 52, a chuck 53, and a spring 54. The fixed cylinder 51 is fixedly connected to the inner wall of the drill rod body 10. The movable rod 52 is movably connected to the inside of the fixed cylinder 51, and the first end of the movable rod 52 extends to the outside of the fixed cylinder 51. The chuck 53 is fixedly connected to the first end of the movable rod 52. The spring 54 is sleeved on the movable rod 53, and one end of the spring 54 contacts the chuck, while the other end of the spring 54 contacts the fixed cylinder. That is, the spring 54 is sandwiched between the chuck 53 and the fixed cylinder 51. Specifically, the side of the docking plate 22 is provided with a positioning block 221 protruding to the side, and the upper and lower surfaces of the positioning block 221 are both inclined. Correspondingly, the upper and lower surfaces of the chuck 53 are also inclined. When connecting the drill bit body 20 and the drill pipe body 10, as described above, the centering rod 21 on the drill bit body 20 needs to be connected with the centering sleeve block 11 on the drill pipe body 10. When the drill bit body 20 drives the centering rod 21 to initially insert into the centering sleeve block 11, the docking plate 22 moves upward, and the upper surface (sloping surface) of the positioning block 221 protruding from the side of the docking plate 22 will laterally press the chuck 53, thereby compressing the spring 54. As the docking plate 22 continues to move upward, when the positioning block 221 moves above the chuck 53, based on the reset action of the spring 54, the spring 54 will push the chuck 53 to move inward and reset, that is, the chuck 53 moves below the positioning block 221, so that the chuck 53 can lock the positioning block 221 to prevent it from moving downward, thus achieving the initial positioning of the drill bit body 20. Then, the clamping and fixing mechanism 30 is operated to perform a clamping action to clamp and fix the drill bit body. When disassembling the drill bit body 20, after the clamping and fixing mechanism 30 is released, the drill bit body 20 is moved downward by external force. Under the weight of the drill bit body 20 itself and the external pulling force, the lower surface (sloping surface) of the positioning block 221 protruding from the side of the docking plate 22 will laterally press the chuck 53, thereby allowing the drill bit body 20 to be removed.

[0057] In summary, this utility model, a drill bit replacement device for drilling, enables rapid clamping and disassembly of the drill bit body. Its simple and convenient operation significantly improves the ease and efficiency of drill bit body replacement. Furthermore, the inclusion of a sealing component enhances the sealing performance between the drill bit body and the drill pipe body. The placement component eliminates the need for external tools to maintain the drill bit body's position relative to the drill pipe body before clamping and fixing, further improving the convenience of clamping and fixing the drill bit body. Therefore, this utility model effectively overcomes the various shortcomings of existing technologies and possesses high industrial applicability.

[0058] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A drill bit replacement device suitable for drilling, characterized in that, include: The drill pipe body has an internally fixed centering sleeve block. The drill bit body has a centering rod fixedly provided on its top, and a centering sleeve is fitted on the centering rod, which can drive the centering rod to rotate synchronously; a docking plate is also fixedly provided on the circumferential surface of the centering rod. A clamping and fixing mechanism is disposed inside the drill pipe body. The clamping and fixing mechanism includes at least two curved clamping rods, a movable extrusion module, and a drive source. The at least two curved clamping rods are spaced apart along the circumferential direction of the drill pipe body, and the middle part of each curved clamping rod is hinged to the inner wall of the drill pipe body. The upper end of the curved clamping rod contacts the movable extrusion module, and the lower end of the curved clamping rod contacts the bottom surface of the docking plate. The drive source can drive the movable extrusion module to move up and down. Based on the up and down movement of the movable extrusion module, the lower end of the curved clamping rod can push the docking plate upward or move the lower end of the curved clamping rod downward away from the docking plate.

2. The drill bit replacement device suitable for drilling according to claim 1, characterized in that, The movable extrusion module includes a movable sleeve, an extrusion ring, an internally threaded tube, and a drive screw. The movable sleeve is fitted onto the centering sleeve and restricts the movable sleeve from rotating relative to it. The extrusion ring is fixedly disposed on the circumferential surface of the movable sleeve and contacts the upper end of the curved clamping rod. The internally threaded tube is fixedly disposed on the top of the movable sleeve. The first end of the drive screw is rotatably connected to the top of the centering sleeve, and the second end of the drive screw extends upward through the movable sleeve and is threadedly connected to the internally threaded tube and driven by the drive source. The drive source is used to drive the drive screw to rotate.

3. A drill bit replacement device suitable for drilling according to claim 2, characterized in that, The outer diameter of the extrusion ring gradually increases from top to bottom.

4. A drill bit replacement device suitable for drilling according to claim 2, characterized in that, The centering sleeve is square in shape, and the movable sleeve has a square hole that matches the shape of the centering sleeve.

5. A drill bit replacement device suitable for drilling according to claim 1, characterized in that, The centering rod is square, and the centering sleeve has a square hole that matches the centering rod.

6. A drill bit replacement device suitable for drilling according to claim 1, characterized in that, The curved clamping rod includes a first rod segment and a second rod segment, with a set angle between the first rod segment and the second rod segment, and the connection between the first rod segment and the second rod segment is hinged to the inner wall of the drill rod body.

7. A drill bit replacement device suitable for drilling according to claim 6, characterized in that, The angle between the first segment and the second segment is 120° to 150°.

8. A drill bit replacement device suitable for drilling according to claim 1, characterized in that, A sealing assembly is provided at the connection between the drill rod body and the drill bit body. The sealing assembly includes an annular sealing seat, a sealing groove, and a sealing ring fixedly connected to the top of the drill bit body. The sealing groove is opened at the bottom of the drill rod body, the annular sealing seat is engaged in the sealing groove, and the sealing ring is sandwiched between the annular sealing seat and the sealing groove.

9. A drill bit replacement device suitable for drilling according to claim 1, characterized in that, The drill pipe body is also equipped with a positioning mechanism, which can position the drill bit body to prevent the drill bit body from moving relative to the drill pipe body.

10. A drill bit replacement device suitable for drilling according to claim 9, characterized in that, The positioning mechanism includes a fixed cylinder, a movable rod, a chuck, and a spring. The fixed cylinder is fixedly connected to the inner wall of the drill rod body. The movable rod is movably connected to the inside of the fixed cylinder, with its first end extending to the outside of the fixed cylinder. The chuck is fixedly connected to the first end of the movable rod. The spring is sleeved on the movable rod, with one end of the spring contacting the chuck and the other end of the spring contacting the fixed cylinder. The side of the docking plate is provided with a positioning block protruding to the side. The upper and lower surfaces of the positioning block are both inclined, and the upper and lower surfaces of the chuck are also inclined.

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