A drill bit

Abstract

The present invention provides a drill bit, which relates to the technical field of post-anchoring. The drill bit includes a drill rod, and a groove extending along the axial direction of the drill rod is formed from one end of the drill rod to the opposite end, and the groove penetrates the drill rod in the radial direction of the drill rod; a pushing member, including a connecting portion and a base connected to the connecting portion, and the connecting portion can move along the axial direction in the groove; a plurality of blades, each blade is at least partially disposed in the groove and adjacent to the connecting portion, wherein the plurality of blades can move along the groove under the drive of the connecting portion to protrude from or retract into the drill rod; wherein the thicknesses of the groove and the plurality of blades both increase as they approach the axis, and the thickness of the end of the groove away from the axis is smaller than the thickness of the end of the plurality of blades close to the axis. The drill bit of the present invention can effectively prevent the blades from easily slipping off the drill rod and falling off.

Description

Technical Field

[0001] The present invention relates to the technical field of post-anchoring, and particularly to a drill bit. Background Art

[0002] The post-anchoring technology refers to anchoring on an existing concrete structure through relevant technical means, mainly including mechanical anchor bolts, chemical anchor bolts, and planting bars, etc. Among them, the post-cutting and under-reaming type anchor bolt in mechanical anchor bolts realizes the anchoring of structural fasteners through the mechanical interlock between the cut groove at the bottom of the concrete drill hole and the expansion head of the anchor rod. According to different cutting groove methods, the post-cutting and under-reaming type anchor bolts are divided into self-cutting groove anchor bolts and pre-cutting groove anchor bolts.

[0003] The related self-cutting groove anchor bolts come with their own cutting tools and cut grooves and ream holes by themselves during installation, and the cutting groove installation is completed at one time. However, the self-bottom-cutting anchor bolts need to use special drill bits to complete the two tasks of reaming and anchor bolt anchoring at the same time, and the cost of this kind of anchor bolt is about four times that of ordinary expansion anchor bolts. The related pre-cutting groove anchor bolts use special drilling tools for pre-cutting grooves and reaming holes, and then use ordinary anchor bolts for fixation. Some adopt the transmission mode of gears and racks to realize the expansion and contraction of the blades at the end of the drill bit. The reaming drill bit of this form has a complex structure and high cost. Others use a reset part to realize the expansion and contraction of the blades. Although the under-reaming drill bit has a simple structure, is convenient for installation, and has a low cost, on the one hand, the restoring force generated between the reset parts is difficult to adjust, and on the other hand, once the reset part fails due to fatigue loss, the contraction and expansion of the blades will fail, resulting in the blades being easily slipped off from the drill rod and falling off, affecting the working efficiency. Summary of the Invention

[0004] In view of this, the main object of the present invention is to provide a drill bit to solve the problem that the blades of the under-reaming drill bit are easily slipped off from the drill rod and fall off.

[0005] To achieve the above object, the technical solution of the present invention is realized as follows:

[0006] The present invention provides a drill bit, including: a drill rod, a groove extending along the axial direction of the drill rod is formed from one end of the drill rod to the opposite end, and the groove penetrates the drill rod in the radial direction of the drill rod; a pushing member, including a connecting portion and a base connected to the connecting portion, the connecting portion can move along the axial direction in the groove; a plurality of blades, each blade is at least partially arranged in the groove and adjacent to the connecting portion, wherein, the plurality of blades can move along the groove under the drive of the connecting portion to protrude or retract into the drill rod; wherein, the thicknesses of the groove and the plurality of blades both increase as they approach the axis, and the thickness of the end of the groove away from the axis is less than the thickness of the end of the plurality of blades close to the axis.

[0007] Further, the blade includes: a cutting edge located at the outer edge of the blade; a back edge located at the inner edge of the blade; an upper sliding surface connecting one end of the cutting edge and one end of the back edge, and the upper sliding surface is used to abut against the groove; a lower sliding surface connecting the other end of the cutting edge and the other end of the back edge, and the lower sliding surface is used to abut against the connecting portion.

[0008] Further, the cutting edge includes a first cutting edge and a second cutting edge, and the included angle formed by the extending direction of the first cutting edge and the extending direction of the second cutting edge is greater than 0 degrees and less than 180 degrees.

[0009] Further, the back edge includes a first back edge and a second back edge, and the included angle formed by the extending direction of the upper sliding surface and the extending direction of the lower sliding surface is greater than 0 degrees and less than 180 degrees.

[0010] Further, the pushing member is coaxially arranged with the drill pipe; wherein, the thickness of the connecting portion increases as it approaches the axis, and the size of the connecting portion matches the size of the groove.

[0011] Further, the connecting portion is provided with a positioning groove penetrating the connecting portion along the axial direction; the end of the drill pipe is provided with a positioning hole penetrating the drill pipe along the radial direction; the drill bit further includes a positioning pin, and the positioning pin is arranged in the positioning groove and the positioning hole to limit the movement of the connecting portion.

[0012] Further, the connecting portion has a first contact surface and a second contact surface abutting against the blade, and the first contact surface and the second contact surface are symmetrically arranged about the axis.

[0013] Further, the connecting portion further has a third contact surface connecting the first contact surface and the second contact surface.

[0014] Further, there are a plurality of the grooves, and the grooves communicate with each other.

[0015] Further, the drill bit further includes a slag receiving groove, which is arranged adjacent to the groove.

[0016] A drill bit provided by an embodiment of the present invention includes a drill pipe, a pushing member and a plurality of blades. Among them, the thicknesses of the groove and the plurality of blades both increase as they approach the axis, and the thickness of the end of the groove far from the axis is less than the thickness of the end of the plurality of blades close to the axis. In the present invention, the structures of the blade and the groove both have the characteristic of gradually changing thickness, so that when the blade moves radially along the groove, it can be clamped in the groove, effectively avoiding the blade from easily slipping off the drill pipe and falling off. Description of the Drawings

[0017] Figure 1aSchematic diagram of the working principle of the drill bit according to an embodiment of the present invention in one working state;

[0018] Figure 1b Schematic diagram of the working principle of the drill bit according to an embodiment of the present invention in another working state;

[0019] Figure 2a Left view of the drill pipe structure of the drill bit according to an embodiment of the present invention;

[0020] Figure 2b For Figure 2a Schematic diagram of the cross-sectional view in the A-A direction;

[0021] Figure 2c For Figure 2b Schematic diagram of the cross-sectional view in the B-B direction;

[0022] Figure 3a Front view of the structure of the pushing member of the drill bit according to an embodiment of the present invention;

[0023] Figure 3b Left view of the structure of the pushing member of the drill bit according to an embodiment of the present invention;

[0024] Figure 4 Schematic diagram of the assembly drawing of the drill pipe and the pushing member of the drill bit according to an embodiment of the present invention;

[0025] Figure 5a Schematic diagram of the structure of the drill bit according to an embodiment of the present invention in one working state;

[0026] Figure 5b Schematic diagram of the structure of the drill bit according to an embodiment of the present invention in another working state;

[0027] Figure 6a For Figure 5a Schematic diagram of the cross-sectional view in the C-C direction;

[0028] Figure 6b For Figure 5b Schematic diagram of the cross-sectional view in the D-D direction;

[0029] Figure 7 Schematic diagram of the structure of the blade of the drill bit according to an embodiment of the present invention;

[0030] Figure 8 Top view of the structure of the pushing member of the drill bit according to an embodiment of the present invention;

[0031] Figure 9 Schematic diagram of the groove structure diagram of another drill bit;

[0032] Figure 10 Schematic diagram of the blade structure of another drill bit;

[0033] Figure 11Schematic structural view of the slag holding groove of the drill bit according to an embodiment of the present invention.

[0034] Description of reference numerals:

[0035] 10 - drill pipe, 11 - groove, 12 - positioning hole, 13 - slag holding groove, 14 - slag guiding groove, 20 - pushing member, 21 - connecting portion, 211 - positioning groove, 212 - first contact surface, 213 - second contact surface, 214 - third contact surface, 22 - base, 30 - blade, 31 - cutting edge, 311 - first cutting edge, 312 - second cutting edge, 32 - back of the blade, 33 - upper sliding surface, 34 - lower sliding surface, 40 - positioning pin, O' - central axis, X - horizontal symmetry axis, Y - vertical symmetry axis, θ - angle formed by the first cutting edge and the second cutting edge, α - angle formed by the upper sliding surface and the lower sliding surface, F - force exerted by the wall surface of the construction object on the first cutting edge, F1 - horizontal component of force F, F2 - vertical component of force F, v - speed of the blade relative to the first contact surface of the connecting portion, v1 - horizontal component of speed v, v2 - vertical component of speed v, v' - speed of the blade relative to the groove, v1' - horizontal component of speed v', v2' - vertical component of speed v' Detailed implementation manners

[0036] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0037] For each specific technical feature described in the specific embodiments, without conflict, they can be combined in any suitable manner. For example, different embodiments and technical solutions can be formed by combining different specific technical features. To avoid unnecessary repetition, various possible combination manners of each specific technical feature in the present invention will not be described separately.

[0038] In the following descriptions, the terms "first / second" involved are only used to distinguish different objects and do not indicate that there is any same or related relationship between the two. It should be understood that the orientation descriptions "above" and "below" involved are all in the orientations in the normal use state.

[0039] It should be noted that the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or apparatus comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or elements inherent to such process, method, article or apparatus. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising such element. The term "connected" includes both direct connection and indirect connection unless otherwise specified. The term "a plurality" means greater than or equal to two. The term "thickness" refers to the distance between two relatively large-area faces of a sheet or block.

[0040] The present invention provides a drill bit, which can be widely used as a post-anchoring tool in the field of engineering construction technology, such as building beams, slabs, columns, walls, brackets, etc. Reinforcement, decoration, installation and other processes are achieved through drilling and / or reaming. It should be noted that the application scenario type of the present invention does not limit the drill bit of the present invention.

[0041] The following combines Figure 1a and Figure 1b to give an exemplary illustration of the working principle of the drill bit. The drill bit may include a drill rod 10, a pushing member 20 and a blade 30. The drill rod 10 may be a substantially cylindrical rod-shaped object, with a groove opened at one end for placing the pushing member 20 and the blade 30. The pushing member 20 can move relative to the drill rod 10 along the groove to drive the blade 30 to move relative to the drill rod 10, and the blade 30 has an open state and a contracted state. In the open state of the blade 30, along the radial direction of the drill rod 10, the distance between the two farthest points (or lines / or surfaces) of the two opposite blades 30 is greater than the outer diameter of the drill rod 10; in the contracted state, the blade 30 is completely received in the groove. As Figure 1a shown, when the blade 30 of the drill bit is in the contracted state, it extends towards the surface of the construction object and aligns with the area to be processed. The drill rod 10 starts to rotate at a high speed driven by an external machine, and the end of the pushing member 20 of the drill bit cuts and grinds the surface of the construction object, playing the role of a downward-probing drill bit. Then the drill bit is continuously inserted into the construction object until the preset depth, completing the processing of a straight hole, i.e., drilling. At this time, the diameter of the straight hole is substantially the same as the outer diameter of the drill rod 10; as Figure 1b shown, the blade 30 is switched from the contracted state to the open state, and the part of the blade 30 protruding from the drill rod 10 can continue to cut the wall surface of the straight hole in contact with it to achieve reaming. After reaming is completed, the blade 30 is switched from the open state to the contracted state again, and the drill bit is lifted. The drill bit completes the whole process of drilling and reaming through the above method.

[0042] In an embodiment of the present invention, as Figure 1aand Figure 1b As shown, the drill bit includes a drill pipe 10, a pushing member 20, and a plurality of blades 30. As Figure 2a shown, a groove 11 extending along the axial direction of the drill pipe 10 is formed from one end to the opposite end of the drill pipe 10, and the groove 11 penetrates the drill pipe 10 in the radial direction of the drill pipe 10. Specifically, the drill pipe 10 is a substantially cylindrical rod-shaped object, and the central axis O' of the cylinder is the axis. Along the direction of the central axis O', the drill pipe 10 is provided with a groove 11 extending from one end to the other end. As Figure 2a shown in the up-down direction, the groove 11 extends upward from the bottom end of the drill pipe 10, and the groove 11 is a symmetric structure with the symmetry axis being the central axis O'. As Figure 2b and 2c shown, the groove 11 penetrates the drill pipe 10 in the radial direction of the drill pipe 10, so that the groove 11 communicates with the outside.

[0043] As Figure 3a and 3b shown, the pushing member 20 includes a connecting portion 21 and a base 22 connected to the connecting portion 21. Specifically, the connecting portion 21 can be a substantially sheet-like object, and the structure of the base 22 can be diverse, which can be a cone or a pyramid, that is, a structure with one end sharp and the other end blunt, so as to reduce the resistance of the cutting object and effectively break the area to be processed to form a hole. In an exemplary embodiment, the base 22 is a cone, and its diameter is substantially the same as the outer diameter of the drill pipe 10. The end face of the base 22 is connected to one end of the connecting portion 21. The connecting portion 21 and the base 22 can be integrally formed, or can be fixedly connected by welding or threaded connection, etc.

[0044] As Figure 4 shown, the connecting portion 21 can move along the axial direction in the groove 11. Specifically, the connecting portion 21 can be inserted into the groove 11 and move relative to the drill pipe 10 in the direction of the central axis O' in the groove 11 to drive the base 22 to move accordingly. When the connecting portion 21 moves to one end of the movement range (such as Figure 4 shown in the upper end), the end face of the base 22 can contact the bottom end of the drill pipe 10.

[0045] As Figure 5a and 5b shown, each blade 30 is at least partially disposed in the groove 11 and adjacent to the connecting portion 21. Specifically, each blade 30 is symmetrically arranged about the central axis O', and the structural shapes of each blade 30 are substantially the same. The number of blades 30 is arbitrary and can be determined according to the number of grooves 11. In the embodiment of the present invention, one groove 11 is adopted. Correspondingly, two blades 30 can be arranged along the radial direction. The blade 30 can be inserted into the groove 11 and abut against the end of the connecting portion 21 away from the base 22. It should be noted that abutting means that two components are in contact and abutted against each other to form a close contact.

[0046] As Figure 5a and 5b shown, multiple blades 30 can move along the groove 11 driven by the connecting part 21 to protrude from or retract into the drill pipe 10. Specifically, as Figure 5a shown, when the drill bit is in a non-working state or in a state of drilling a straight hole, all the blades 30 are located within the groove 11, that is, the retracted drill pipe 10. When the drill bit needs to perform a reaming operation, the pusher 20 moves in the direction of the central axis O' towards the drill pipe 10 (as Figure 5a indicated by the arrow), and the connecting part 21 can push the blade 30 located within the groove 11 to move relative to the drill pipe 10. Under the continuous pushing force of the connecting part 21, more and more parts of the blade 30 gradually protrude outside the drill pipe 10, presenting an open state, that is, as Figure 5b shown. It should be noted that even in the extreme open state, the blade 30 cannot all protrude from the drill pipe 10. At least a part of the blade 30 is located within the groove 11 and is connected to the connecting part 21 and the groove 11 to prevent the blade 30 from falling off the drill pipe 10, that is, each blade 30 is at least partially arranged within the groove 11.

[0047] As Figure 6a shown, the thicknesses of both the groove 11 and the multiple blades 30 increase as they approach the axis. It should be noted that the thickness refers to the distance between two relatively larger surfaces. As Figure 6a shown is a cross-sectional view of the drill bit, where X and Y are the two symmetry axes of the groove 11 and the blade 30. The thickness of the groove 11 is the length of the cross-section of the groove 11 in the vertical direction, and the thickness of the blade 30 is the length of the cross-section of the blade 30 in the vertical direction. The length of the line segment where the cross-section of the groove 11 coincides with the symmetry axis Y is the maximum thickness value of the groove 11, and the length of the line segment where the cross-section of the blade 30 coincides with the symmetry axis Y is the maximum thickness value of the blade 30. The thicknesses of the groove 11 and the blade 30 gradually decrease along the symmetry axis X from the symmetry axis Y. And the minimum thickness of the groove 11 is greater than the minimum thickness of the blade 30, so that the blade 30 can protrude from the drill pipe 10 when moving along the symmetry axis X.

[0048] As Figure 6b shown, the thickness of the end of the groove 11 far from the axis is less than the thickness of the end of the multiple blades 30 close to the axis. Specifically, the minimum thickness of the groove 11 is less than the maximum thickness of the blade 30. When the blade 30 moves along the symmetry axis X, the maximum thickness part of the blade 30 cannot pass through the minimum thickness part of the groove 11, so that the blade 30 can be fixed in the groove 11 to prevent the blade from falling off the drill pipe 10 when moving along the symmetry axis X.

[0049] In the embodiments of the present invention, a drill pipe, a pushing member, and a plurality of blades are provided on a drill bit. The blades can move within a groove formed in the drill pipe. The thicknesses of both the groove and the plurality of blades increase as they approach the axis, and the thickness of the end of the groove away from the axis is smaller than the thickness of the end of the plurality of blades close to the axis. With the structures of the blades and the groove both having the characteristic of gradually changing thickness, the blades can be clamped in the groove during the radial movement along the groove, effectively solving the problem that the blades are likely to slide off the drill pipe and fall off.

[0050] In some embodiments, as Figure 7 shown, the blade 30 includes a cutting edge 31, a back 32, an upper sliding surface 33, and a lower sliding surface 34. The cutting edge 31 is located at the outer edge of the blade 30. Specifically, the outer edge refers to the edge of the blade 30 in the direction away from the central axis O'. The cutting edge 31 is used for cutting objects. The back 32 is located at the inner edge of the blade. Specifically, the inner edge refers to the edge of the blade 30 in the direction close to the central axis O'. The back 32 is also the part with the largest thickness of the entire blade 30, which can provide good stiffness guarantee for the rotary cutting of the blade 30.

[0051] As Figure 5b shown, the upper sliding surface 33 connects one end of the cutting edge 31 and one end of the back 32. The upper sliding surface 33 is used to abut against the groove 11. It should be noted that abutting means that two components come into contact and abut against each other to form a close contact. The upper sliding surface 33 has a certain angle with the central axis O'. The top surface of the groove 11 has the same angle with the central axis O'. In this way, the upper sliding surface 33 can form a good contact with the top surface of the groove 11, enabling the upper sliding surface 33 to slide along the top surface of the groove 11. The lower sliding surface 34 connects the other end of the cutting edge 31 and the other end of the back 32. The lower sliding surface 34 is used to abut against the connecting portion 21. Specifically, the angle formed by the lower sliding surface 34 and the central axis O' is the same as the angle formed by the end surface of the connecting portion 21 and the central axis O'. In this way, the lower sliding surface 34 can form a good contact with the end surface of the connecting portion 21, enabling the lower sliding surface 34 to slide along the end surface of the connecting portion 21.

[0052] By setting the blade as a polygonal structure, some sides have cutting functions, some sides have guiding functions, and some sides have good stiffness performance. Each function is clear, ensuring the safety, reliability, and practicality of the blade.

[0053] In some embodiments, as Figure 7As shown, the cutting edge 31 includes a first cutting edge 311 and a second cutting edge 312, and the included angle θ formed by the extending direction of the first cutting edge 311 and the extending direction of the second cutting edge 312 is greater than 0° and less than 180°. Specifically, after the reaming step is completed, the first cutting edge 311 and the second cutting edge 312 are in contact with the hole wall surface of the construction object. When the drill pipe 10 is lifted, the hole wall surface exerts a force F perpendicular to the wall surface of the first cutting edge 311 on the first cutting edge 311, and this force can be decomposed into a first component force F1 and a second component force F2 in the horizontal and vertical directions. Among them, the first component force F1 in the horizontal direction can cause the blade to return and be received into the groove 11 of the drill pipe 10. And only when the included angle θ is greater than 0° and less than 180°, can a horizontal component force F1 be generated on the first cutting edge 311 when the drill pipe 10 is lifted to receive the blade 30 into the groove 11. By setting the included angle formed by the first cutting edge and the second cutting edge to be greater than 0° and less than 180°, when the drill bit needs to be lifted after reaming, the horizontal component force exerted by the hole wall surface of the construction object on the cutting edge can be used to receive the blade into the groove without contacting any external force. This design eliminates the need to additionally install a blade return part to reset the blade, saving the cost of the drill bit.

[0054] In some embodiments, as Figure 7 shown, the included angle α formed by the extending direction of the upper sliding surface 33 and the extending direction of the lower sliding surface 34 is greater than 0° and less than 180°. Specifically, as Figure 5b shown, both the upper sliding surface 33 and the lower sliding surface 34 are inclined surfaces, and the included angle between the two inclined surfaces is 0° < α < 180°. The upper sliding surface 33 is the surface in direct contact with the groove 11, and the lower sliding surface 34 is the surface in direct contact with the connecting part 21. When the connecting part 21 moves upward in the vertical direction, the blade 30 moves relative to the connecting part 21 along the inclined surface of the connecting part 21 at a speed v, and the speed v can be decomposed into a horizontal speed component v1 and a vertical speed component v2; when the blade 30 slides along the inclined surface of the groove 11 at a speed v', a horizontal speed component v1' and a vertical speed component v2' can be generated; among them, the vertical speed component v2 and the vertical speed component v2' are equal in magnitude and opposite in direction, so the blade 30 has no displacement in the vertical direction, and the horizontal speed components v1 and v1' are in the same direction, causing the blade 30 to move outward relative to the drill pipe 10 in the horizontal direction, that is, the blade 30 can protrude from the drill pipe 10. And only when the included angle 0° < α < 180° is satisfied, can an outward acting force be generated on the blade 30 in the horizontal direction to make the blade protrude from the drill pipe 10. By setting the included angle formed by the upper sliding surface and the lower sliding surface to be greater than 0° and less than 180°, the design of the inclined surface can play a guiding role to make the blade move to protrude from the drill pipe.

[0055] In some embodiments, as Figure 5bAs shown, the pusher 20 is arranged coaxially with the drill pipe 10. Specifically, the pusher 20 is symmetric about the central axis O'. In this way, when the pusher 20 moves along the central axis O', it can drive multiple blades 30 to move synchronously to protrude from the drill pipe 10, so that the protruding parts of each blade 30 are the same, meeting the uniformity of reaming. As Figure 8 As shown, the thickness of the connecting part 21 increases as it approaches the axis, and the size of the connecting part 21 matches the size of the groove 11. Specifically, the matching means that the thickness of the connecting part 21 is approximately the same as the thickness of the groove 11 and can be exactly adapted. The groove 11 and the connecting part 21 can adopt an interference fit method, so that the connecting part 21 can be more easily inserted into the groove 11 and slide within the groove 11. Since both the groove 11 and the connecting part 21 are thick in the middle and thin on both sides and their sizes are adapted, the connecting part 21 cannot move in the radial direction within the groove 11, and the connecting part 21 can always be centered with the drill pipe 10 during movement without central offset. By restricting the movement of the connecting part along the radial direction of the groove through the thickness of the groove, the pusher can always move centered with the drill pipe, and the design is simple and ingenious.

[0056] In some embodiments, as Figure 5a As shown, a positioning groove 211 is provided along the axial direction of the connecting part 21 and penetrates the connecting part 21. Specifically, the positioning groove 211 extends from one end close to the base 22 along the direction of the central axis O' to the opposite end, and penetrates the connecting part 21 along the thickness direction of the connecting part 21. The width of the positioning groove 211 is much smaller than the width of the connecting part 21. It should be noted that the width refers to the distance between the two opposite faces of the component along the direction perpendicular to the central axis O'. A positioning hole 12 is provided along the radial direction at the end of the drill pipe 10 and penetrates the drill pipe 10. Specifically, the positioning hole 12 can be a roughly circular hole, with the center of the circle located on the central axis O'. Along the radial direction of the drill pipe 10, the positioning hole 12 penetrates the drill pipe 10, and the diameter of the positioning hole 12 is approximately the same as the width of the positioning groove 211. The drill bit further includes a positioning pin 40, and the positioning pin 40 is arranged in the positioning groove 211 and the positioning hole 12 to limit the movement of the connecting part 21. Specifically, the length of the positioning pin 40 is greater than the length of the positioning hole 12. The connecting part 21 is inserted into the groove 11, and the positioning pin 40 passes through the positioning hole 12 and the positioning groove 211, so that the connecting part 21 is movably connected to the drill pipe 10. When the connecting part 21 moves relative to the drill pipe 10 to the other end of the movement range (such as Figure 5a the lower end shown), the positioning pin 40 can prevent the connecting part 21 from completely disengaging from the drill pipe 10. By setting the positioning groove, positioning hole and positioning pin, they jointly play a role in restricting the movement of the connecting part. This mating connection method is simple, easy to install and replace, and has a low cost.

[0057] In some embodiments, as Figure 5bAs shown, the connecting portion 21 has a first contact surface 212 and a second contact surface 213 that abut against the blade 30. The first contact surface 212 and the second contact surface 213 are symmetrically arranged about the axis. Specifically, the first contact surface 212 and the second contact surface 213 are symmetric about the central axis O'. The first contact surface 212 and the second contact surface 213 abut against the lower sliding surface 34 of the blade 30. The symmetrical arrangement of the first contact surface and the second contact surface of the connecting portion can drive each blade 30 to move synchronously. The synchronous movement between the blades is achieved through the symmetrically arranged first contact surface and second contact surface of the connecting portion.

[0058] In some embodiments, as Figure 5b shown, the connecting portion 21 further has a third contact surface 214 connecting the first contact surface 212 and the second contact surface 213. Specifically, the third contact surface 214 is perpendicular to the central axis O'. When the blade 30 is completely received in the groove 11, as Figure 5a shown, the third contact surface 214 can form a vacant space with the included angle at the coincidence of the blade 30, preventing the top of the connecting portion 21 from contacting the blade 30 and causing impact and damage to the blade 30. By providing the third contact surface, the damage at the intersection of the blades is effectively reduced.

[0059] In other embodiments, as Figure 9 shown, there are multiple grooves 11, and the grooves 11 communicate with each other. Specifically, the number of grooves 11 can be arbitrary, it can be one or multiple. The more the number of grooves 11, correspondingly, the higher the processing difficulty of the drill pipe 10. Therefore, the number of grooves 11 can be flexibly set according to actual needs. As Figure 10 shown, the number of blades 30 corresponds to the number of grooves 11. The more the blades 30, the higher the efficiency of drilling and reaming, but the cost of the blades will also be higher.

[0060] In some embodiments, as Figure 11 shown, the drill bit further includes a slag receiving groove 13, which is arranged adjacent to the groove 11. Specifically, the slag receiving groove 13 is arranged at one end of the outer surface of the drill pipe 10 close to the groove 11. During the working process of the drill bit, cutting slag will be generated. The slag receiving groove 13 is used to receive the slag, effectively reducing the slag from falling to the bottom of the hole. At the same time, the drill bit further includes a slag guiding groove 14 communicating with the slag receiving groove 13. The slag guiding groove 14 is arranged at the other end of the drill pipe 10 away from the groove 11 and communicates with the outside. The centrifugal force generated by the high-speed rotation of the drill bit can discharge the slag along the channel of the slag guiding groove 14 to the external environment. The number of the slag receiving groove 13 and the slag guiding groove 14 can be one or more, and their shapes can be the same or different, and the structures can be linear or spiral.

[0061] The above is only the preferred embodiment of the present invention, and is not used to limit the protection scope of the present invention.

Claims

1. A drill bit, characterized in that, Comprising: A drill pipe, with a groove extending along the axial direction of the drill pipe formed from one end to the opposite end of the drill pipe, and the groove penetrating the drill pipe in the radial direction of the drill pipe; A pushing member, including a connecting portion and a base connected to the connecting portion, and the connecting portion can move along the axial direction within the groove; A plurality of blades, each blade being at least partially disposed within the groove and adjacent to the connecting portion, wherein the plurality of blades can move along the groove driven by the connecting portion to protrude from or retract into the drill pipe; Wherein, the thicknesses of both the groove and the plurality of blades increase as they approach the axis, and the thickness of the end of the groove away from the axis is less than the thickness of the end of the plurality of blades close to the axis.

2. The drill bit according to claim 1, wherein The blade includes: A cutting edge, located at the outer edge of the blade; A back, located at the inner edge of the blade; An upper sliding surface, connecting one end of the cutting edge and one end of the back, and the upper sliding surface is used to abut against the groove; A lower sliding surface, connecting the other end of the cutting edge and the other end of the back, and the lower sliding surface is used to abut against the connecting portion.

3. The drill bit according to claim 2, characterized in that, The cutting edge includes a first cutting edge and a second cutting edge, and the included angle formed by the extending direction of the first cutting edge and the extending direction of the second cutting edge is greater than 0 degrees and less than 180 degrees.

4. The drill bit according to claim 2, wherein, The included angle formed by the extending direction of the upper sliding surface and the extending direction of the lower sliding surface is greater than 0 degrees and less than 180 degrees.

5. The drill bit according to claim 1, characterized in that, The pushing member is arranged coaxially with the drill pipe; wherein, the thickness of the connecting portion increases as it approaches the axis, and the size of the connecting portion matches the size of the groove.

6. The drill bit according to claim 5, characterized in that, The connecting portion is provided with a positioning groove penetrating the connecting portion along the axial direction; the end of the drill pipe is provided with a positioning hole penetrating the drill pipe along the radial direction; the drill bit further includes a positioning pin, and the positioning pin is disposed within the positioning groove and the positioning hole to limit the movement of the connecting portion.

7. The drill bit according to claim 2, characterized in that, The connecting portion has a first contact surface and a second contact surface abutting against the blade, and the first contact surface and the second contact surface are symmetrically arranged with respect to the axis.

8. The drill bit according to claim 7, wherein, The connecting portion further has a third contact surface connecting the first contact surface and the second contact surface.

9. The drill bit according to claim 1, wherein, There are a plurality of the grooves, and the grooves communicate with each other.

10. The drill bit according to claim 1, characterized in that, The drill bit further includes a slag receiving groove, which is arranged adjacent to the groove.

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