Dimension-adjustable drill bit

Abstract

The invention discloses a size-adjustable drill bit, and relates to the technical field of drill rods, the size-adjustable drill bit comprises a drill rod and a cutter sleeved in a sleeve piece on the drill rod, and further comprises a first assembly and an arc-shaped cavity, the first assembly is arranged in the arc-shaped cavity, and the arc-shaped cavity is formed in the drill rod; the first assembly comprises a main body piece fixedly connected into the arc-shaped cavity, and vertical cavities are symmetrically and fixedly connected to the main body piece; through the overall design of the first assembly and the mode of adjusting the size through liquid injection, the stability and reliability of drilling work can be greatly improved; a traditional mechanical adjusting drill bit is prone to loosening due to complex stress in the drilling process, the first assembly indirectly acts on a drill bit structure through liquid pressure on the basis of the liquid injection principle, and the hidden danger that a mechanical connecting piece loosens is avoided. Under the working condition of high-load and long-time drilling operation, the stable size can be kept all the time, drilling deviation caused by size change is effectively avoided, and operation coherence and reliability are guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of drill rods, in particular to a drill bit with adjustable size. BACKGROUND

[0002] In modern manufacturing, construction, home decoration and repair, drilling is an indispensable basic operation link. As the core tool for drilling, the performance of the drill bit directly affects the efficiency and quality of the operation. However, there are many problems to be solved in the existing drill bit technology.

[0003] From the aspect of size adjustment, traditional drill bits are usually designed with fixed size, and the operator must frequently replace drill bits of different specifications according to the specific drilling diameter and depth requirements. In a large mechanical processing workshop, if multiple hole diameters need to be drilled, the operator needs to repeatedly select and replace drill bits from a large number of drill bits, which not only greatly reduces the production efficiency, but also increases the labor cost and management difficulty. In the context of home decoration, ordinary users often cannot successfully complete the drilling operation due to the lack of complete drill bit specifications, and have to purchase new drill bits, resulting in resource waste. Even though there are some drill bits with adjustable size on the market, their design is usually targeted at specific application scenarios, such as the drilling requirements of special equipment in certain industries, which makes it difficult to be widely applied in different fields, and the universality is seriously insufficient.

[0004] In terms of adjustment method and stability, most existing drill bits with adjustable size use mechanical structures for size adjustment, such as threaded connection, buckle fitting, etc. In the actual drilling process, the drill bit will be subjected to strong axial pressure, torsional force and high-frequency vibration from the workpiece. These complex mechanical factors can cause the mechanical adjustment structure to loosen and displace, resulting in difficulty in ensuring the drilling size accuracy. For example, in the manufacturing of precision instruments, even a small size deviation can prevent the parts from being properly assembled, causing product scrap and significant economic losses. Moreover, frequent stress and structural changes can accelerate the wear and damage of the drill bit body, shorten the service life of the drill bit, and increase the production cost.

[0005] In addition, with the development of the industrial and construction fields, drilling scenarios are becoming increasingly complex and diverse, often requiring drilling on inclined surfaces, curved surfaces and other non-planar surfaces. Traditional drill bits lack effective positioning and stabilizing structures, and are prone to slipping and deviating during non-planar drilling, making it difficult to accurately align the drilling position, and even causing safety accidents. For example, in shipbuilding, it is difficult for existing drill bits to meet the drilling requirements of curved surface structures on the ship body, which seriously hinders the construction progress and quality.

[0006] In summary, it is an urgent technical problem in the current industry to develop a new drill bit with convenient size adjustment, strong universality, high stability and applicability to various complex work surfaces.

[0007] Therefore, the present application provides a size-adjustable drill bit to solve the above problems. SUMMARY

[0008] Therefore, the present application provides a size-adjustable drill bit to solve the above problems.

[0009] To achieve the above object, the present application provides the following technical scheme: a size-adjustable drill bit, comprising a drill rod and a cutter sleeved in a sleeve on the drill rod, further comprising a first assembly and an arc-shaped chamber, the first assembly is arranged in the arc-shaped chamber, and the arc-shaped chamber is arranged in the drill rod.

[0010] The first assembly comprises a main body fixedly connected in the arc-shaped chamber, and vertical cavities are fixedly connected symmetrically on the main body;

[0011] A liquid injection valve pipe is fixedly connected to the upper end of the vertical cavity, and the end of the liquid injection valve pipe away from the vertical cavity is embedded in the main body;

[0012] A plug-in rod is transversely movably inserted in the main body;

[0013] A connecting block is fixedly connected to the outer end of the plug-in rod, and the connecting block is fixedly connected with the main body;

[0014] Further comprising a second assembly, the second assembly is used for stabilizing the stability of the drilling action of the drill rod.

[0015] As a preferred, the second assembly comprises a transverse slot transversely arranged in the main body, and a spring is fixedly connected to the inner wall of the transverse slot;

[0016] The end of the spring away from the fixed inner wall of the transverse slot is fixedly connected with a transverse moving column, and the transverse moving column is transversely slid in the transverse slot;

[0017] The end of the transverse moving column away from the spring is fixedly connected with a counterweight.

[0018] As a preferred, a groove is arranged on the transverse moving column, and an inclined block is fixedly connected in the groove;

[0019] A vertical column is movably inserted in the main body, an inclined slot is arranged on the vertical column, and the inclined block is slidably fitted in the inclined slot.

[0020] As a preferred, a limiting hole is equidistantly arranged on the cutter.

[0021] As a preferred, a threaded hole is equidistantly arranged on the drill rod, and a fastening screw is threadedly connected in the threaded hole;

[0022] The kit is provided with an auxiliary through hole, and the fastening screw is threadedly connected with the threaded hole through the auxiliary through hole.

[0023] As preferred, the plug-in rod is plugged into the main body for limiting the longitudinal movement of the drill during drilling.

[0024] As preferred, the vertical column is used in cooperation with the limiting hole for limiting the transverse movement of the drill during drilling.

[0025] Compared with the prior art, the present application provides a size-adjustable drill bit, which has the following beneficial effects:

[0026] 1. The present application has the following advantages by the overall design of the first assembly and the liquid injection size adjustment mode:

[0027] The stability and reliability are greatly improved: the traditional mechanical adjustment drill bit is prone to looseness under complex stress during drilling, while the first assembly indirectly acts on the drill bit structure based on the liquid injection principle, without mechanical connection loosening hidden trouble; under high load and long time drilling operation condition, the stable size can be maintained all the time, the drilling deviation caused by size variation is effectively avoided, and the operation continuity and reliability are ensured;

[0028] The precision and processing quality are significantly improved: the liquid injection adjustment can realize precise control of the size of the drill bit, and in the fields such as precision electronic component manufacturing and aerospace part processing which have very high requirements on hole diameter precision, the first assembly can ensure that the drilled hole diameter completely meets the design standard, greatly reduces the waste rate caused by size error, and improves the overall quality and good product rate of the product.

[0029] 2. The second assembly cooperates with the first assembly by the design of the counterweight under the premise of centrifugal force in the working process, which brings multi-dimensional performance optimization to the drilling operation, and compared with the traditional drill bit technology, the following advantages can be brought:

[0030] Double limiting ensures drilling stability: the counterweight of the second assembly generates centrifugal force when the drill bit rotates at high speed, drives the horizontal displacement column to drive the vertical column to accurately plug into the limiting hole, realizes rigid constraint of the transverse displacement of the tool; in cooperation with the first assembly for precise control of the longitudinal displacement of the tool, a longitudinal and transverse double limiting system is formed; in the engineering such as base surface drilling which needs to withstand strong vibration and complex external force, the design can effectively offset the shaking and deviation during drilling, so that the drill bit maintains a stable posture, greatly reduces the problems such as irregular hole wall and hole diameter out-of-tolerance caused by drill bit swinging, and ensures the efficient and stable operation of the drilling operation.

[0031] Significantly improve drilling accuracy: The longitudinal and transverse double-limiting mechanism significantly improves the drilling positioning accuracy, avoiding the hole diameter error caused by tool displacement deviation; in the field of precision instrument manufacturing and other strict hole diameter tolerance requirements, the double-limiting design ensures the accurate positioning of the tool in the three-dimensional space, so that the drilling accuracy can reach sub-millimeter level or even higher standard, effectively reducing the rework and material waste caused by size error, and improving the product processing quality and production efficiency.

[0032] 3, The innovative design of equally spaced different height threaded holes on the drill rod can dynamically adjust the tool height according to the characteristics of the drilling surface and material requirements, which brings the following benefits to the drilling operation:

[0033] Intelligent matching of material properties to improve drilling quality: The hardness and toughness of different materials differ significantly, and the drilling parameters are different. By adjusting the height of the tool on the drill rod through the threaded hole, the length of the drill chuck can be changed, and the cutting depth and feed speed of the drill bit can be indirectly adjusted to adapt to the material properties. When machining high-hardness alloy steel, reducing the tool height can enhance the stability of the drill bit and reduce the risk of chipping. When machining softer aluminum alloy materials, appropriately increasing the tool height can improve the cutting efficiency and prevent material adhesion, ensuring ideal surface quality and machining accuracy in drilling operations on various materials.

[0034] Quick switching operation mode to improve construction efficiency: The standardized design of the equidistant threaded holes makes the tool height adjustment operation simple and convenient. When switching between different working conditions such as flat surfaces and inclined surfaces, the operator does not need to use complex tools, but only needs to quickly disassemble and fix the tool height by tightening the screws between the threaded holes, which can quickly switch the drilling mode. Compared with the traditional method of replacing drill bits or equipment, the operation preparation time is greatly shortened, and the overall construction efficiency is significantly improved.

[0035] Prolong the service life of the drill bit and reduce the overall cost: Dynamic adjustment of tool height can optimize the stress state of the drill bit and avoid excessive wear caused by improper angle or parameter mismatch. For example, when the drilling surface angle is large, reasonable adjustment of the tool height can reduce the lateral stress of the drill bit and reduce the risk of drill breakage. At the same time, this design reduces the need to frequently replace special drill bits due to the inability to adapt to the working conditions, prolongs the service life of the drill bit, reduces the cost of equipment procurement, maintenance and inventory management, and realizes efficient use of resources.

[0036] 4, The threaded hole and the arc-shaped chamber in the present application not only complete the core function of drilling parameter adjustment, but also innovatively realize heat dissipation assistance, which brings multiple benefits to the drilling operation:

[0037] Efficient heat dissipation improves drilling persistence: During drilling, the drill bit and the workpiece rub violently, generating a large amount of heat, which can easily cause the drill bit to anneal and the tool to wear out. The threaded hole and the arc-shaped chamber form a three-dimensional heat dissipation channel, which can quickly remove the heat from the drill bit and the cutting area. In continuous high-intensity drilling operations such as stone processing and metal mold manufacturing, this design can effectively reduce the temperature of the drill bit and effectively prevent performance degradation caused by overheating, ensuring the continuity and stability of the drilling operation.

[0038] Prolong the service life of components and reduce maintenance costs: A stable temperature environment significantly slows down the thermal fatigue and wear of the drill rod and the tool. For example, in high-speed drilling of aluminum alloy, the traditional drill bit needs to be replaced frequently due to insufficient heat dissipation. However, the optimized heat dissipation channel in this design can prolong the service life of the tool, reduce the frequency of component replacement, and not only reduce the cost of consumables, but also significantly shorten the downtime maintenance time. This design is particularly suitable for scenarios such as assembly lines where the equipment utilization rate is extremely high, significantly improving the overall utilization rate of the equipment.

[0039] Ensure operation safety and reduce potential risks: Overheating can cause the drill bit to degrade in performance, leading to safety accidents such as drill rod breakage and tool cracking. The heat dissipation design of the threaded hole and the arc-shaped chamber effectively controls the operating temperature, maintains the structural strength of the drill bit, and maintains the cutting performance. In environments where safety is a top priority, such as flammable and explosive environments, this design avoids potential risks caused by high temperatures, provides more reliable safety protection for operators, and reduces the probability of accidents.

[0040] Realize structural reuse and optimize product design: The heat dissipation function is integrated into the adjustment structure, avoiding the space occupation and structural complexity caused by additional heat dissipation devices. The above multifunctional design has significant advantages in small-sized precision equipment and handheld power tools, improving overall performance without increasing product size and weight. For example, in micro-electronic device assembly drilling tools, the compact heat dissipation and adjustment integrated structure can reduce the device size while meeting the high-precision drilling and efficient heat dissipation requirements, promoting the development of drilling tools towards integration and lightweight. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 The above multifunctional design has significant advantages in small-sized precision equipment and handheld power tools, improving overall performance without increasing product size and weight. For example, in micro-electronic device assembly drilling tools, the compact heat dissipation and adjustment integrated structure can reduce the device size while meeting the high-precision drilling and efficient heat dissipation requirements, promoting the development of drilling tools towards integration and lightweight.

[0042] Figure 2 The above multifunctional design has significant advantages in small-sized precision equipment and handheld power tools, improving overall performance without increasing product size and weight. For example, in micro-electronic device assembly drilling tools, the compact heat dissipation and adjustment integrated structure can reduce the device size while meeting the high-precision drilling and efficient heat dissipation requirements, promoting the development of drilling tools towards integration and lightweight. Figure 1

[0043] Figure 3 The above multifunctional design has significant advantages in small-sized precision equipment and handheld power tools, improving overall performance without increasing product size and weight. For example, in micro-electronic device assembly drilling tools, the compact heat dissipation and adjustment integrated structure can reduce the device size while meeting the high-precision drilling and efficient heat dissipation requirements, promoting the development of drilling tools towards integration and lightweight.

[0044] Figure 4 The above multifunctional design has significant advantages in small-sized precision equipment and handheld power tools, improving overall performance without increasing product size and weight. For example, in micro-electronic device assembly drilling tools, the compact heat dissipation and adjustment integrated structure can reduce the device size while meeting the high-precision drilling and efficient heat dissipation requirements, promoting the development of drilling tools towards integration and lightweight.

[0045] Figure 5 ​For the invention of horizontal column, vertical column and inclined block, inclined groove related structure diagram;

[0046] Figure 6 For the invention of the state diagram before the main device installation;

[0047] Figure 7 For the invention of the kit after cutting, arc chamber, liquid injection valve pipe related structure diagram;

[0048] Figure 8 For the invention of the main structure exploded view;

[0049] Figure 9 For the invention of the appearance diagram.

[0050] In the figure:

[0051] 1, drill pipe; 2, kit; 3, cutter;

[0052] 4, the first component; 401, main body; 402, vertical cavity; 403, liquid injection valve pipe; 404, plug-in rod; 405, connecting block;

[0053] 5, arc chamber;

[0054] 601, fastening screw; 602, threaded hole;

[0055] 7, the second component: 701, horizontal slot; 702, spring; 703, horizontal column; 704, counterweight; 705, groove; 706, inclined block; 707, vertical column; 708, inclined groove; 709, limit hole. DETAILED DESCRIPTION

[0056] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0057] The present application will be further described in detail according to the drawings and embodiments.

[0058] Embodiments

[0059] Please refer to Figures 1 to 3 , Figures 6 to 9 shown:

[0060] To solve the problems mentioned in the technical solutions, the embodiment of the present application provides a size-adjustable drill bit, which comprises a drill rod 1 and a cutter 3 sleeved in a sleeve 2 on the drill rod 1, and further comprises a first assembly 4 and an arc-shaped cavity 5, the first assembly 4 is arranged in the arc-shaped cavity 5, and the arc-shaped cavity 5 is arranged in the drill rod 1.

[0061] The first assembly 4 is used for adjusting the drilling size of the drill rod 1; the first assembly 4 comprises a main body 401 fixedly connected in the arc-shaped cavity 5, the main body 401 is symmetrically fixedly connected with a vertical cavity 402, the vertical cavity 402 is fixedly connected with a liquid injection valve pipe 403 at the upper end, the liquid injection valve pipe 403 is embedded in the main body 401 at the end away from the vertical cavity 402, the main body 401 is laterally movably connected with a plug-in rod 404, the plug-in rod 404 is fixedly connected with a connecting block 405 at the outer end, and the connecting block 405 is fixedly connected with the main body 401.

[0062] The drill rod 1 is equidistantly provided with threaded holes 602, and the threaded holes 602 are threadedly connected with fastening screws 601; the sleeve 2 is provided with auxiliary through holes, and the fastening screws 601 are threadedly connected with the threaded holes 602 through the auxiliary through holes.

[0063] Among them:

[0064] The external injection device can inject solution into the vertical cavity 402 through the liquid injection valve pipe 403.

[0065] The fastening screws 601 are used in combination with the threaded holes 602 at different positions on the drill rod 1, the height of the cutter 3 on the drill rod 1 can be dynamically adjusted according to different drilling surfaces, such as slope surfaces, so as to be suitable for the adjustment of the drilling surface.

[0066] The arc-shaped cavity 5 can be used in combination with the threaded holes 602 for heat dissipation during drilling.

[0067] The drill rod 1, the sleeve 2 and the cutter 3 can constitute a whole drill bit.

[0068] Further embodiments: please refer to Figure 1 、 Figure 4 、 Figure 8 、 Figure 9 ,

[0069] The second assembly 7 is used for stabilizing the stability of the drilling action of the drill rod 1; the second assembly 7 comprises a transverse slot 701 transversely formed on the main body 401, a spring 702 fixedly connected to the inner wall of the transverse slot 701, a transverse moving column 703 fixedly connected to the end of the spring 702 away from the fixed inner wall of the transverse slot 701, the transverse moving column 703 being transversely slid in the transverse slot 701, a counterweight 704 fixedly connected to the end of the transverse moving column 703 away from the spring 702, a recess 705 formed on the transverse moving column 703, an inclined block 706 fixedly connected in the recess 705, a vertical column 707 vertically movably inserted on the main body 401, an inclined slot 708 formed on the vertical column 707, the inclined block 706 being slidably fitted in the inclined slot 706, and a limiting hole 709 equidistantly formed on the cutter 3.

[0070] Wherein:

[0071] The spring 702 is mainly used for resetting the transverse moving column 703.

[0072] Under the action of the gravity of the counterweight 704 and the centrifugal force of the drilling action, the transverse moving column 703 can move transversely.

[0073] The inclined direction of the limiting hole 709 is from bottom to top.

[0074] The second assembly 7 can be increased in number according to specific requirements.

[0075] The working principle of all the above embodiments is as follows:

[0076] In the initial state:

[0077] The spring 702 is not stretched, and the vertical column 707 is not inserted into the limiting hole 709.

[0078] First, the sleeve assembly 2 is sleeved on the drill rod 1, then the height of the sleeve assembly 2 on the drill rod 1 is adjusted according to the workpiece requirements of the required drilling, and further, when the height adjustment is completed, the operator fastens the sleeve assembly 2 with the threaded hole 602 on the drill rod 1 through the fastening screw 601.

[0079] The following is the working process of the first assembly 4:

[0080] When the initial position of the cutter 3 and the drill rod 1 is adjusted firmly by height adjustment, the operator can add solution medium to the vertical cavity 402 in the main body 401 through the injection valve pipe fitting 403 by the external solution filling equipment, such as the solution filling piston cylinder, in this process, with the addition of solution, the added solution will push the plug-in rod 404 in the process of gradual addition, with the movement of the plug-in rod 404, the plug-in rod 404 will move the cutter 3 to the outside of the sleeve 2 through the connecting block 405, at this time, the drilling size of the drill bit as a whole will be gradually adjusted to be larger with the outward movement of the cutter 3;

[0081] Further, through the above operation, the operator only needs to add a certain amount of solution medium to the vertical cavity 402 according to the process requirements to effectively adjust the drilling size during the working process of the drill bit;

[0082] The above working process please refer to Figures 1 to 3 、 Figures 6 to 9 .

[0083] The following is the working process of the second assembly 7:

[0084] Further, when the drill bit size adjustment is completed, the drilling operation can be started, in this process, with the working of the drill bit as a whole, the counterweight 704 will move in the horizontal slot 701 with the horizontal moving column 703 under the action of centrifugal force, at this time, the spring 702 is stretched, further, with the horizontal movement of the horizontal moving column 703, the vertical column 707 will be forced to move to the direction of the limiting hole 709 opened on the cutter 3 under the action of the inclined block 706 in the groove 705 of the horizontal moving column 703 and the inclined groove 708 opened on itself, and be inserted into the limiting hole 709, at this time, the cutter 3 is effectively limited and fixed, to further ensure its stability during the working process.

[0085] The above working process please refer to Figure 1 、 Figure 4 、 Figure 8 、 Figure 9 .

[0086] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting; it is not intended to exclude myriad other embodiments of the present application that other inventors can develop based on the same general inventive concepts embodied by the described embodiments. That is, although the present application is described in terms of particular embodiments and implementations, it is to be understood that the terminology used is for the purpose of descriptive clarity and that it is intended to be limited only by the words recited in the appended claims. It is to be understood that the terms "including", "comprising", "consisting" and variations thereof do not preclude the addition of further integers to the claimed combination of integers. It is to be understood that the terms "including", "comprising", "consisting" and variations thereof encompass the terms "consisting of" and "consisting essentially of". It is to be understood that the terms "including", "comprising", "consisting" and variations thereof are not intended to exclude other integers or additional integers not specifically recited. It is to be understood that the terms "including", "comprising", "consisting" and variations thereof are not to be construed as limiting the scope of the claimed concept to the complete reading of the claims. It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting; it is not intended to exclude myriad other embodiments of the present application that other inventors can develop based on the same general inventive concepts embodied by the described embodiments. That is, although the present application is described in terms of particular embodiments and implementations, it is to be understood that the terminology used is for the purpose of descriptive clarity and that it is intended to be limited only by the words recited in the appended claims.

[0087] While the embodiments of the application have been shown and described herein, it is to be understood that the application is not limited to the embodiments described, and it is not intended to exclude myriad other embodiments of the present application that other inventors can develop based on the same general inventive concepts embodied by the described embodiments. That is, although the present application is described in terms of particular embodiments and implementations, it is to be understood that the terminology used is for the purpose of descriptive clarity and that it is intended to be limited only by the words recited in the appended claims.

Claims

1. A size-adjustable drill bit, comprising: The drill rod (1) and the cutting tool (3) sleeved in the kit (2) on the drill rod (1) are characterized in that they further include: a first component (4) and an arc-shaped chamber (5), wherein the first component (4) is disposed in the arc-shaped chamber (5) and the arc-shaped chamber (5) is opened in the drill rod (1); The first component (4) includes a main body (401) fixedly connected in the arc-shaped chamber (5), and vertical cavities (402) are symmetrically fixedly connected to the main body (401); The upper end of the vertical cavity (402) is fixedly connected to an injection valve fitting (403), and the end of the injection valve fitting (403) away from the vertical cavity (402) is inserted into the main body (401). A connector rod (404) is laterally movably inserted into the main body (401); The outer end of the plug rod (404) is fixedly connected to a connecting block (405), and the connecting block (405) is fixedly connected to the main body (401); It also includes a second component (7) for stabilizing the drilling operation of the drill rod (1).

2. The adjustable drill bit according to claim 1, characterized in that: The second component (7) includes a transverse groove (701) that is transversely opened on the main body (401), and a spring (702) is fixedly connected to the inner wall of the transverse groove (701); The spring (702) is fixedly connected to a transverse column (703) at one end away from the inner wall of the transverse groove (701), and the transverse column (703) slides laterally within the transverse groove (701); A counterweight (704) is fixedly connected to the end of the transverse column (703) away from the spring (702).

3. The adjustable drill bit according to claim 2, characterized in that: The transverse column (703) has a groove (705) and an inclined block (706) is fixedly connected in the groove (705); A vertical column (707) is vertically movably inserted into the main body (401), and an inclined groove (708) is provided on the vertical column (707). The inclined block (706) is slidably adapted to the inclined block (706).

4. The adjustable drill bit according to claim 1, characterized in that: The cutting tool (3) has equidistant limiting holes (709).

5. The adjustable drill bit according to claim 1, characterized in that: The drill rod (1) has threaded holes (602) at equal intervals, and fastening screws (601) are threaded into the threaded holes (602); The kit (2) has an auxiliary through hole, and the fastening screw (601) is threadedly connected to the threaded hole (602) through the auxiliary through hole.

6. The adjustable drill bit according to claim 1, characterized in that: The insertion rod (404) is inserted into the main body (401) to limit the longitudinal movement of the tool (3) during drilling.

7. The adjustable drill bit according to claim 3, characterized in that: The vertical post (707) is used in conjunction with the limiting hole (709) to limit the lateral movement of the tool (3) during drilling.

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