Impacter drill bit center hole machining and positioning tool

Abstract

The utility model provides an impactor drill bit center hole machining positioning tool which comprises a base, a clamping device and a drilling device, and the clamping device and the drilling device are coaxially and vertically arranged on the base. A sliding groove is formed in the base along the axis, the clamping device is fixedly arranged at the position, at one end of the sliding groove, of the base, and the drilling device and the clamping device are coaxially arranged on the base and can move along the sliding groove. The clamping device comprises a fixing seat and a three-jaw chuck seat, the fixing seat is arranged on the base, a positioning hole for a drill bit to penetrate through is formed in the fixing seat along the horizontal axis, and a three-jaw chuck is arranged on the fixing seat and is coaxial with the positioning hole. The clamping device for the drill bit to penetrate through is used for clamping the regular middle portion of the drill bit, the problems of inaccurate positioning, unstable clamping and the like existing in a traditional tool are solved, and machining efficiency and safety are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of machining, especially to a percussion drill bit center hole machining positioning tool. BACKGROUND

[0002] With the development of industry, various infrastructure projects are continuously advancing. Percussion drills and drill bits are widely used in opening operations in mine, hydropower station, port, road and tunnel engineering construction. The percussion drill is used to provide high-pressure compressed air into the front and rear cavities of the percussion drill to make the piston produce high-speed reciprocating motion to impact the drill bit, so as to impact and break the rock through the alloy teeth on the drill bit, and finally realize the impact drilling operation. The rock debris produced is blown out of the hole bottom by the high-pressure gas discharged by the percussion drill, and finally the hole is formed. The machining of the drill bit has high requirements on the surface precision. Before finishing, the center point of the drill bit needs to be determined and the center hole is drilled to facilitate subsequent machining. The existing lathe generally uses one end clamping and the other end drilling the center hole with a drill bit. However, due to the uneven structure of the drill bit, it is difficult to determine the center position with a large processing allowance, which may cause the center hole to deviate during clamping and positioning of the forging. Once the deviation occurs, it will cause the subsequent process to be invalid, which seriously affects the production progress and production cost.

[0003] The prior art CN202123023728.0 discloses a percussion drill bit clamp, which comprises a base, a first clamp and a second clamp. The first clamp comprises a first mounting member and a first clamping member, the first mounting member is mounted on the base, and the first clamping member is mounted on the first mounting member. The second clamp comprises a second mounting member and a second clamping member, the second mounting member comprises a fixed part and a movable part, the fixed part is mounted on the base, and the movable part is rotatably connected with the fixed part. The second clamping member is mounted on the movable part, and the movable part is used to drive the second clamping member to rotate to open and close the clamping cavity. Although the first clamp and the second clamp can limit and clamp the drill bit, the following problems still exist:

[0004] 1. Although the clamp designs the first clamp and the second clamp to clamp the drill bit, due to the complex shape of the drill bit, especially for non-standard shaped drill bits, it may not be possible to completely guarantee the accurate positioning of the center of the drill bit during clamping, thereby affecting the machining quality of the center hole.

[0005] 2. The first clamp and the second clamp of the clamp are difficult to keep synchronous clamping, and accurate center positioning cannot be achieved, which requires fine tuning for accurate positioning, greatly affecting work efficiency. When the clamping blocks of the two clamps are locked by the screw rod, they are easy to deflect, and the clamping is not firm enough, which may cause the drill bit to move or vibrate during machining, thereby affecting the machining quality and safety. UTILITY MODEL CONTENT

[0006] Therefore, the utility model discloses a kind of impactor drill bit center hole processing positioning tool, by the clamping device that can be passed through to the regular middle part of drill is clamped, not only solve the problem of traditional tooling, such as inaccurate positioning, clamping instability, also greatly improve processing efficiency and security.

[0007] The utility model discloses a kind of impactor drill bit center hole processing positioning tool, which solves the technical problems by adopting the technical scheme of:

[0008] Provided is an impactor drill bit center hole processing positioning tool, comprising: a base, a clamping device and a drilling device, the clamping device and the drilling device are coaxially vertically arranged on the base;

[0009] The base is provided with a sliding groove along the axis, the clamping device is fixedly arranged on the base at one end of the sliding groove, and the drilling device is coaxially arranged on the base with the clamping device and can move along the sliding groove; The clamping device comprises a fixed seat and a three-jaw chuck seat, the fixed seat is arranged on the base, and a positioning hole for the drill to pass through is formed in the fixed seat along the horizontal axis, the three-jaw chuck is arranged on the fixed seat and coaxially arranged with the positioning hole, and the diameter of the positioning hole is greater than the diameter of the center hole of the three-jaw chuck seat.

[0010] It should be noted that the clamping device and the drilling device are coaxially arranged on the base, which helps to reduce the processing errors caused by improper equipment layout; the sliding groove on the base allows the drilling device to move axially, which provides convenience for adjusting the drilling depth and also enables the equipment to adapt to the processing needs of drill bits of different lengths; the clamping device uses a three-jaw chuck seat, which can automatically adjust to the optimal clamping state when clamping drill bits of different diameters, avoiding errors caused by manual adjustment, further ensuring the accuracy of the center positioning of the drill bit, and ensuring the stability of the drill bit during processing, reducing the risk of deviation and vibration; the positioning hole in the fixed seat is coaxially arranged with the center hole of the three-jaw chuck, ensuring that the drill bit can pass through the center hole and the positioning block, so that the clamping device can be clamped on the regular cylindrical surface of the drill bit, improving the positioning accuracy of the drill bit during processing.

[0011] Preferably, the drilling device comprises a sliding block, a drilling motor and a drill rod, the sliding block is arranged on the sliding groove and can slide along the sliding groove, the drilling motor is fixedly installed on the sliding block, and the drill rod is installed on the output shaft of the drilling motor and coaxially arranged with the center hole of the three-jaw chuck.

[0012] It should be noted that the role of the slider is to bear the drilling motor and drill rod, to ensure that they can be accurately moved along the sliding groove; the slider is usually made of high-strength materials such as cast iron or aluminum alloy to ensure its stability and durability in long-term use, and the cooperation between the slider and the sliding groove is tight to reduce the gap and vibration when sliding; the drilling motor is the power source of the drilling device, responsible for driving the drill rod to rotate, and the installation position of the motor should be coaxial with the center hole of the three-jaw chuck to ensure the accurate alignment of the drill rod; the drill rod is installed on the output shaft of the drilling motor to ensure that it is coaxially arranged with the center hole of the three-jaw chuck, so that the drill rod can always maintain the correct direction during drilling, reducing deviation and vibration.

[0013] Preferably, the fixing seat comprises a fixing plate and a positioning plate, the fixing plate is fixed on the base, and the positioning plate is vertically arranged on one end of the fixing plate and detachably connected with the fixing plate, and the positioning hole is arranged on the positioning plate.

[0014] It should be noted that the main function of the fixing plate is to stably install the entire fixing seat on the base, ensuring the stability of the fixing seat during processing, and the fixing plate is in the shape of "L" to ensure that the positioning plate can be stably fixed thereon. The main function of the positioning plate is to provide a vertical plane on the fixing plate for installing the three-jaw chuck, and to provide a positioning hole on the positioning plate for the drill bit to pass through and enter the center hole of the three-jaw chuck, ensuring accurate positioning of the drill bit during processing.

[0015] Preferably, the three-jaw chuck comprises a chuck body and three adjustable clamping jaws, the chuck body is provided with a center hole for the drill bit to pass through, and the clamping jaws are evenly arranged around the center hole on the chuck body and can be synchronously moved along the radial direction of the chuck body through the adjustment of the adjustment device.

[0016] It should be noted that the chuck body is the main part of the three-jaw chuck, which provides a stable platform for installing and adjusting the clamping jaws. The clamping jaws can be synchronously moved along the radial direction of the chuck body through the adjustment device to adapt to drill bits of different diameters. This design ensures that the clamping jaws can uniformly apply force to prevent the drill bit from deviating or vibrating during clamping. Common adjustment devices include threaded transmission mechanisms, gear transmission mechanisms, or hydraulic transmission mechanisms, which can ensure that the clamping jaws remain synchronized during movement, thereby achieving accurate clamping.

[0017] Preferably, it further comprises a sleeve ring, the sleeve ring is detachably arranged in the center hole of the three-jaw chuck and coaxially arranged with the center hole, and the end of the sleeve ring close to the positioning hole is a tapered surface that opens outward.

[0018] Need to explain, the sleeve is arranged in the center hole of the three-jaw chuck, and is coaxial with the center hole. Its main function is to assist the accurate positioning of the drill bit, and to guide the drill bit to smoothly enter the center hole of the three-jaw chuck through the conical surface, and to adapt to the clamping of drill bits of different specifications by replacing the sleeve of different diameters.

[0019] Preferably, the diameter of the positioning hole is greater than the upper end diameter of the drill bit and less than the lower end diameter of the drill bit.

[0020] Need to explain, greater than the upper end diameter of the drill bit can ensure that the drill bit can smoothly pass through the positioning hole, and will not be stuck because the hole diameter is too small; less than the lower end diameter of the drill bit can ensure that the lower end of the drill bit can be effectively supported and positioned when passing through the positioning hole, preventing the drill bit from deviating or vibrating during processing; the diameter of the positioning hole ensures that the drill bit can be quickly positioned and fixed during processing, improving processing efficiency.

[0021] Preferably, a scale bar is arranged on the upper end of the slide groove in the axial direction.

[0022] Need to explain, the main function of the scale bar is to provide accurate measurement reference, helping the operator to accurately control the movement distance of the drilling device on the slide groove, which helps to ensure the consistency and accuracy of the drilling depth; and the scale bar enables the operator to intuitively see the current position of the drilling device, facilitating fine tuning and correction, improving the convenience and accuracy of operation.

[0023] Preferably, a cooling liquid conduit is arranged on the base, and the outlet of the cooling liquid conduit is located above the drill rod, and a flow regulating valve is arranged on the cooling liquid conduit.

[0024] Need to explain, the main function of the cooling liquid conduit is to provide cooling liquid for the drill rod to reduce the temperature of the drill rod during processing, preventing the drill rod from being worn and the processing quality from being reduced due to high temperature.

[0025] Preferably, limit blocks are arranged at both ends of the slide groove.

[0026] Need to explain, the main function of the limit block is to prevent the drilling device from moving beyond the predetermined range on the slide groove, avoiding equipment damage or processing errors caused by overtravel.

[0027] The beneficial effects of the utility model are as follows:

[0028] The utility model provides a kind of impactor drill bit center hole processing positioning tool, by clamping device and drilling device coaxial setting on base, with the center hole of the positioning hole on fixed base and three-jaw chuck coaxial setting, ensure the accurate positioning of drill bit in processing process, reduce processing error, drilling device can move along sliding slot, adapt to the drill bit processing demand of different length, the design of three-jaw chuck can be automatically adjusted to optimum clamping state, applicable to drill bit of different diameter, improve the flexibility and scope of application of equipment. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a kind of impactor drill bit center hole processing positioning tool's perspective diagram of the utility model embodiment 1.

[0030] Figure 2 It is the use state diagram of the utility model embodiment 1's a kind of impactor drill bit center hole processing positioning tool.

[0031] Figure 3 It is the installation structure schematic diagram of the fixed base of the utility model embodiment 1.

[0032] Figure 4 It is the installation structure schematic diagram of the three-jaw chuck seat and collar of the utility model embodiment 1.

[0033] Figure 5 It is the structure schematic diagram of the collar of the utility model embodiment 1.

[0034] Figure 6 It is a kind of impactor drill bit center hole processing positioning tool's perspective diagram of the utility model embodiment 1.

[0035] In the drawing: 1, base;11, sliding slot;2, clamping device;21, fixed base;211, positioning hole;212, fixed plate;213, positioning plate;22, three-jaw chuck seat;221, center hole;3, drilling device;31, sliding block;32, drilling motor;33, drill rod;4, collar;5, scale bar;6, cooling liquid guide pipe;7, limit block;8, drill bit.

[0036] It should be noted that these drawings and text description do not indicate in any way limit the concept range of the utility model, but by referring to specific embodiment for the person skilled in the art to explain the concept of the utility model. DETAILED DESCRIPTION

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0038] Example 1

[0039] like Figures 1-5 As shown, a positioning fixture for machining the center hole of an impactor drill bit includes: a base 1, a clamping device 2, and a drilling device 3, wherein the clamping device 2 and the drilling device 3 are coaxially and vertically arranged on the base 1.

[0040] The base 1 has a groove 11 along its axis. The clamping device 2 is fixedly mounted on the base 1 at one end of the groove 11. The drilling device 3 is coaxially mounted on the base 1 with the clamping device 2 and can move along the groove 11. The clamping device 2 includes a fixed base 21 and a three-jaw chuck base 22. The fixed base 21 is mounted on the base 1 and has a positioning hole 211 along its horizontal axis for the drill bit 8 to pass through. The three-jaw chuck is mounted on the fixed base 21 and is coaxially mounted with the positioning hole 211. The diameter of the positioning hole 211 is larger than the diameter of the central hole 221 of the three-jaw chuck base 22.

[0041] The drilling device 3 includes a slider 31, a drilling motor 32, and a drill rod 33. The slider 31 is disposed on the slide groove 11 and can slide along the slide groove 11. The drilling motor 32 is fixedly mounted on the slider 31. The drill rod 33 is mounted on the output shaft of the drilling motor 32 and is coaxially arranged with the center hole 221 of the three-jaw chuck.

[0042] The fixed base 21 includes a fixed plate 212 and a positioning plate 213. The fixed plate 212 is fixed on the base 1. The positioning plate 213 is vertically arranged on one end of the fixed plate 212 and is detachably connected to the fixed plate 212. The positioning hole 211 is opened on the positioning plate 213.

[0043] The three-jaw chuck includes a chuck body and three adjustable jaws. The chuck body has a central hole 221 through which the drill bit 8 passes. The jaws are evenly distributed around the central hole 221 on the chuck body and can move synchronously along the radial direction of the chuck body by adjustment of the adjustment device.

[0044] It also includes a collar 4, which is detachably disposed in the center hole 221 of the three-jaw chuck and is coaxially disposed with the center hole 221, and the end of the collar 4 near the positioning hole 211 is an outwardly flared conical surface.

[0045] The working principle and use method of the impactor drill bit center hole machining positioning tool of the embodiment are as follows:

[0046] The impactor drill bit center hole machining positioning tool provided by the embodiment comprises a base 1, a clamping device 2 and a drilling device 3. The base 1 is used as the basis of the whole tool. A sliding groove 11 is arranged on the base 1 along an axis line, and is used to support the movement of the drilling device 3. The clamping device 2 is fixedly arranged on the base 1 at one end of the sliding groove 11, and comprises a fixed seat 21 and a three-jaw chuck seat 22. The fixed seat 21 is arranged on the base 1, and a positioning hole 211 for the drill bit 8 to pass through is arranged on the fixed seat 21 along a horizontal axis line. The diameter of the positioning hole 211 is greater than the upper end diameter of the drill bit 8 and less than the lower end diameter of the drill bit 8, so as to ensure that the drill bit 8 can pass through smoothly and be effectively supported. The three-jaw chuck is arranged on the fixed seat 21, and a central hole 221 of the three-jaw chuck is coaxially arranged with the positioning hole 211. After the drill bit 8 passes through the positioning hole 211, the three-jaw chuck synchronously adjusts the clamping jaw through an adjusting device, and clamps the middle part of the drill bit 8. This not only ensures the stability and center positioning accuracy of the drill bit 8 in the machining process, but also ensures that the clamping jaw can uniformly apply force and prevent the drill bit 8 from deviating or vibrating in the clamping process, so as to realize accurate clamping. The sliding block 31 carries the drilling motor 32 and the drill rod 33, and ensures that they can accurately move along the sliding groove 11. The drilling motor 32 drives the drill rod 33 to rotate. Through the movement of the sliding block 31, the drill rod 33 gradually approaches and drills into the central part of the drill bit 8, and the machining of the central hole 221 is completed.

[0047] During use, place the positioning fixture for machining the center hole 221 of the impactor drill bit 8 on a stable workbench, ensuring the base 1 is stable and free from shaking. Check all components for damage, especially the slide groove 11, slider 31, drilling motor 32, and three-jaw chuck, ensuring they are functioning correctly. Select a suitable collar 4 according to the diameter of the drill bit 8 spindle and install it in the center hole 221. Slowly insert the drill bit 8 to be machined along the positioning hole 211, ensuring the axis of the drill bit 8 is perfectly aligned with the axis of the positioning hole 211, and the lower end of the drill bit 8 is effectively supported by the positioning hole 211. Adjust the three-jaw chuck, using the adjustment device to evenly clamp the three jaws of the drill bit 8 to the appropriate position, ensuring the drill bit 8 is firmly fixed while maintaining its axial and radial stability, thus completing the clamping of the drill bit 8. Next, adjust the position of the slider 31 on the slide groove 11 according to the required depth of the center hole 221, ensuring the drill rod... The drill rod 33 is able to accurately reach the predetermined machining point; confirm that the drilling motor 32 is correctly installed on the slider 31 and that the drill rod 33 is firmly installed on the output shaft of the drilling motor 32, ensuring that the drill rod 33 is coaxial with the center hole 221 of the three-jaw chuck, then turn on the drilling motor 32, slowly push the slider 31 along the slide groove 11 towards the drill bit 8, so that the rotating drill rod 33 gradually contacts and drills into the center position of the drill bit 8, and begins to machine the center hole 221. Control the feed speed of the drill rod 33 to avoid damage to the material of the drill rod 33 or the drill bit 8 due to excessive speed, and at the same time, be careful to prevent it from being too slow, which would affect the machining efficiency. When the drill rod 33 reaches the predetermined depth of the center hole 221, turn off the drilling motor 32, move the slider 31 in the opposite direction, so that the drill rod 33 exits from the center hole 221 of the drill bit 8, finally release the three-jaw chuck, take out the machined drill bit 8, and check whether the machining quality meets the requirements.

[0048] Example 2

[0049] like Figure 6 As shown, a positioning fixture for machining the center hole of an impactor drill bit according to this embodiment includes: a base 1, a clamping device 2 and a drilling device 3, wherein the clamping device 2 and the drilling device 3 are coaxially and vertically arranged on the base 1.

[0050] The base 1 has a groove 11 along its axis. The clamping device 2 is fixedly mounted on the base 1 at one end of the groove 11. The drilling device 3 is coaxially mounted on the base 1 with the clamping device 2 and can move along the groove 11. The clamping device 2 includes a fixed base 21 and a three-jaw chuck base 22. The fixed base 21 is mounted on the base 1 and has a positioning hole 211 along its horizontal axis for the drill bit 8 to pass through. The three-jaw chuck is mounted on the fixed base 21 and is coaxially mounted with the positioning hole 211. The diameter of the positioning hole 211 is larger than the diameter of the central hole 221 of the three-jaw chuck base 22.

[0051] The drilling device 3 comprises a sliding block 31, a drilling motor 32 and a drill rod 33, the sliding block 31 is arranged on the sliding groove 11 and can slide along the sliding groove 11, the drilling motor 32 is fixedly installed on the sliding block 31, and the drill rod 33 is installed on the output shaft of the drilling motor 32 and is coaxially arranged with the center hole 221 of the three-jaw chuck.

[0052] The fixing seat 21 comprises a fixing plate 212 and a positioning plate 213, the fixing plate 212 is fixed on the base 1, the positioning plate 213 is vertically arranged on one end of the fixing plate 212 and is detachably connected with the fixing plate 212, and the positioning hole 211 is arranged on the positioning plate 213.

[0053] The diameter of the positioning hole 211 is greater than the upper end diameter of the drill bit 8 and is less than the lower end diameter of the drill bit 8.

[0054] The three-jaw chuck comprises a chuck body and three adjustable clamping jaws, the chuck body is provided with a center hole 221 for the drill bit 8 to pass through, and the clamping jaws are evenly arranged around the center hole 221 on the chuck body and can be synchronously moved along the radial direction of the chuck body through the adjustment of the adjusting device.

[0055] The base 1 is provided with a scale bar 5 axially along the sliding groove 11.

[0056] The base 1 is provided with a cooling liquid conduit 6, the outlet of the cooling liquid conduit 6 is located above the drill rod 33, and the cooling liquid conduit 6 is provided with a flow adjusting valve.

[0057] The sliding groove 11 is provided with a limiting block 7 at both ends.

[0058] Compared with the first embodiment:

[0059] The impactor drill bit center hole machining positioning tool provided by the embodiment can provide accurate measurement reference for the operator, which is helpful to accurately control the moving distance of the drilling device 3 on the sliding groove 11, ensure the consistency and accuracy of the drilling depth, and intuitively show the current position of the drilling device 3 to facilitate fine adjustment and correction, improve the convenience and accuracy of operation, the base 1 is provided with the cooling liquid conduit 6, the outlet of the conduit is located above the drill rod 33, and the conduit is provided with the flow adjusting valve, which can provide cooling liquid for the drill rod 33 during drilling, the cooling liquid can effectively reduce the temperature of the drill rod 33 during machining, prevent the drill rod 33 from being worn and the machining quality from being reduced due to high temperature, prolong the service life of the drill rod 33, improve the machining efficiency, the sliding groove 11 is provided with the limiting block 7 at both ends to avoid equipment damage or machining error caused by overtravel, ensure that the drilling device 3 moves within a safe range, and improve the reliability and safety of the equipment.

[0060] Finally, it needs to be explained that: the above only for the preferred embodiments of the present application, only for the description of the technical scheme of the present application, and is not used to limit the scope of protection of the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application, are included in the scope of protection of the present application.

[0061] In the description of the present application, it should be understood that the terms "upper", "lower", "upper end", "lower end", "upper surface", "lower surface" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0062] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connecting", "connecting", "setting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

Claims

1. A percussion bit center hole machining positioning tool, comprising: Base (1), clamping device (2) and drilling device (3), the clamping device (2) and drilling device (3) are coaxial vertical setting on base (1); It is characterized by: The base (1) is provided with a sliding groove (11) along the axis, the clamping device (2) is fixedly arranged on the base (1) at one end of the sliding groove (11), and the drilling device (3) is coaxially arranged with the clamping device (2) on the base (1) and can move along the sliding groove (11); The clamping device (2) comprises a fixed seat (21) and a three-jaw chuck seat (22), the fixed seat (21) is arranged on the base (1), and a positioning hole (211) for the drill bit (8) to pass through is formed in the fixed seat (21) along the horizontal axis, and the three-jaw chuck is arranged on the fixed seat (21) and coaxially arranged with the positioning hole (211), and the diameter of the positioning hole (211) is greater than the diameter of the center hole (221) of the three-jaw chuck seat (22).

2. The impactor bit center hole positioning tool of claim 1, wherein: The drilling device (3) comprises a sliding block (31), a drilling motor (32) and a drill rod (33), the sliding block (31) is arranged on the sliding groove (11) and can slide along the sliding groove (11), the drilling motor (32) is fixedly installed on the sliding block (31), and the drill rod (33) is installed on the output shaft of the drilling motor (32) and coaxially arranged with the center hole (221) of the three-jaw chuck.

3. The impactor bit center hole positioning tool of Claim 1, wherein: The fixed seat (21) comprises a fixed plate (212) and a positioning plate (213), the fixed plate (212) is fixed on the base (1), the positioning plate (213) is vertically arranged on one end of the fixed plate (212) and detachably connected with the fixed plate (212), and the positioning hole (211) is formed in the positioning plate (213).

4. The impactor bit center hole positioning tool of Claim 1, wherein: The three-jaw chuck comprises a chuck body and three adjustable clamping jaws, the chuck body is provided with a center hole (221) for the drill bit (8) to pass through, and the clamping jaws are evenly distributed around the center hole (221) on the chuck body and can move radially along the chuck body synchronously through the adjustment of the adjusting device.

5. The impactor bit center hole positioning tool of Claim 1, wherein: Further comprising a sleeve ring (4), the sleeve ring (4) is detachably arranged in the center hole (221) of the three-jaw chuck and coaxially arranged with the center hole (221), and the end of the sleeve ring (4) close to the positioning hole (211) is a tapered surface opening outward.

6. The pilot bit center hole location tool of claim 1 wherein: The diameter of the positioning hole (211) is greater than the diameter of the upper end of the drill bit (8) and less than the diameter of the lower end of the drill bit (8).

7. The pilot bit center hole location tool of claim 1 wherein: The base (1) is provided with a scale bar (5) along the sliding groove (11) in the axial direction.

8. The pilot bit center hole location tool of claim 1 wherein: The base (1) is provided with a cooling liquid conduit (6), the outlet of the cooling liquid conduit (6) is located above the drill rod (33), and the cooling liquid conduit (6) is provided with a flow regulating valve.

9. The pilot bit center hole location tool of claim 1 wherein: The sliding groove (11) is provided with a limiting block (7) at both ends.

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