Drilling tool for positioning pin

Abstract

The invention provides a drilling tool for a positioning pin, and discloses the drilling tool for the positioning pin. The tool comprises a rotating disc arranged on a drilling machine workbench, a plurality of mounting stations are arranged on the rotating disc, each mounting station is provided with a positioning assembly used for fixing a workpiece, each positioning assembly comprises a mounting base, a chuck and a positioning disc, each positioning disc is provided with a mounting cavity matched with the to-be-drilled workpiece, and each mounting base is provided with a clamping groove matched with the to-be-drilled workpiece. The axis of a drill bit of the drilling machine coincides with the axis of the mounting cavity located on the drilling station. An auxiliary clamping device is further arranged on the workbench and comprises a rotating piece, a supporting rod, a connecting sleeve, a first telescopic push rod and a second telescopic push rod, and a clamping jaw is arranged at the end of the second telescopic push rod. Continuous machining operation is achieved through the multi-station rotating disc, the drilling device adapts to workpieces of different specifications through the replaceable positioning disc, the drilling stability is improved through the auxiliary clamping device, and the drilling device has the effects of being high in machining efficiency, high in universality and stable and reliable in clamping.

Description

Technical Field

[0001] This invention relates to the field of drilling tooling technology, and more specifically to a drilling tooling for a positioning pin. Background Technology

[0002] Locating pins, as common mechanical fastening and positioning elements, are widely used in the assembly processes of various mechanical equipment, automotive parts, and precision instruments. Their main function is to ensure the relative positional accuracy between components. During the manufacturing process of locating pins, it is often necessary to machine holes of different angles and depths on their ends or sidewalls to meet specific assembly or functional requirements.

[0003] Currently, when drilling workpieces with locating pins, traditional vises or simple clamping devices are typically used to fix the workpiece on the drilling machine's worktable. However, in actual production operations, existing technologies have the following significant shortcomings: Firstly, traditional clamping methods are mostly single-station operations, meaning that only one workpiece can be clamped at a time for drilling. After processing, the machine must be stopped, disassembled, and re-clamped for the next workpiece. This operating mode results in low equipment utilization and makes it difficult to improve processing efficiency. Especially for large-batch production tasks, frequent loading and unloading operations not only consume a lot of working hours but also significantly increase the labor intensity of operators.

[0004] Secondly, due to the diverse specifications of locating pins, their dimensions, shapes, and required drilling angles vary. Existing general-purpose fixtures often struggle to adapt to the diverse processing needs of various types and angles. When processing locating pins of different angles or specifications, it is usually necessary to change the entire set of tooling or make complex adjustments, resulting in poor versatility and flexibility, making it difficult to meet the requirements of diversified production.

[0005] Furthermore, during the drilling process, for some slender or irregularly shaped locating pins, relying solely on the clamping force of the chuck, the workpiece is prone to slight displacement or vibration under the impact of the drill bit feed. This not only affects the positional accuracy of the drilling, but in severe cases, it can also lead to the scrapping of the workpiece or damage to the drill bit, causing unnecessary economic losses.

[0006] Therefore, how to design a drilling fixture that can achieve continuous and efficient processing, adapt to various workpiece specifications, and provide stable and reliable clamping is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0007] In view of this, the present invention provides a drilling fixture for positioning pins to solve the problems of low processing efficiency, poor versatility and insufficient clamping stability of existing fixtures mentioned in the background art.

[0008] To solve the above-mentioned technical problems, the present invention provides a drilling fixture for positioning pins, including a turntable on a worktable set on the upper part of the rotating shaft of a drilling machine. The turntable is provided with multiple installation stations distributed along the circumferential direction. Each installation station is provided with a positioning component for fixing the workpiece. The positioning component includes a mounting base, a chuck, and a positioning plate. The chuck is set on the mounting base, and the positioning plate is set on the chuck. The positioning plate has an installation cavity adapted to the workpiece to be drilled. The axis of the drill bit of the drilling machine coincides with the axis of the installation cavity located at the drilling station.

[0009] Furthermore, a rotating component is also provided on the worktable. A support rod is provided at the output end of the rotating component. A connecting sleeve is provided on the upper part of the support rod. At least two first telescopic push rods are provided on the outside of the connecting sleeve. A second telescopic push rod is provided at the output end of each first telescopic push rod. A pawl is provided at the output end of each second telescopic push rod. The included angle between the at least two first telescopic push rods and the second telescopic push rods is 45-120 degrees. The axial direction of the first telescopic push rod is perpendicular to the axial direction of the second telescopic push rod.

[0010] Specifically, a servo motor is selected as the rotating component. Servo motors are characterized by high control precision and fast response speed, enabling precise control of the rotation angle of the support rod, thereby driving the chuck to move accurately to the predetermined position. In this embodiment, a metal gear servo motor of model MG996R can be used, which can meet the drive requirements of conventional locating pin-assisted clamping.

[0011] Specifically, both the first and second telescopic push rods are electric or hydraulic push rods. When using an electric push rod, precise stroke control can be achieved directly through the control circuit, facilitating automated integration. For example, the XTL100 series miniature electric push rod produced by Wenzhou Sipu Machinery Co., Ltd. is selected, which has a built-in stroke limit switch. When using a hydraulic push rod, it can provide greater clamping force and is suitable for auxiliary fixing of heavy or large positioning pins.

[0012] As an optimization, an angle adjuster is also provided on the upper part of the mounting base, and the bottom of the chuck is mounted on the angle adjuster, which can adjust the tilt angle of the chuck. The angle adjuster can be a worm gear mechanism or a precision rotary table, with its bottom fixed to the mounting base and its top connected to the chuck. Through the angle adjuster, the tilt angle of the positioning plate can be adjusted according to the machining requirements, thereby realizing the machining of inclined holes at different angles without changing tooling.

[0013] Furthermore, the mounting base is provided with an adjustment groove, and the fixed end of the angle adjuster is slidably disposed within the groove. By sliding adjustment, the radial position of the positioning component on the mounting base can be changed to accommodate positioning pins of different lengths or to adjust the machining position. A slider and a locking bolt can be installed in the adjustment groove. After loosening the bolt, the angle adjuster can be slid along the adjustment groove, and locked in place after adjustment.

[0014] Preferably, the number of installation stations is set to be twice the number of drilling stations. For example, if the drilling machine can only process one station at a time, two installation stations can be set on the turntable; if the drilling machine is equipped with multiple drill bits that can process simultaneously, the number of installation stations will increase accordingly. A common configuration is to set up six or eight installation stations, so that the operator can load and unload workpieces in one area while workpieces in other areas are being processed, realizing parallel operation of loading, unloading and processing, and effectively improving production efficiency.

[0015] In one specific embodiment, the number of first telescopic push rods is set to two, and the included angle between the axes of the two first telescopic push rods is 120 degrees. This included angle design makes the two jaws asymmetrically distributed in space, which can apply auxiliary clamping force to the workpiece from different directions. Combined with the radial extension and retraction of the second telescopic push rod, it can achieve stable support for irregularly shaped workpieces or workpieces with offset center of gravity, forming a stable triangular support effect.

[0016] The chuck can be either a three-jaw chuck or a four-jaw chuck, such as the K11 series three-jaw self-centering chuck produced by Yantai Machine Tool Accessories Factory. This chuck features self-centering capability, allowing for quick clamping of locating pins with circular cross-sections. The chuck and mounting base are detachably connected via bolts. This detachable connection facilitates quick replacement of different types of chucks or locating plates depending on the workpiece, greatly improving the versatility of the tooling.

[0017] In addition, anti-slip pads are provided on the inner side of the chucks. The anti-slip pads can be made of wear-resistant rubber materials, such as nitrile rubber, which has good oil resistance and wear resistance. They are used to increase the friction with the workpiece surface, prevent slippage during auxiliary clamping, and avoid direct contact between the metal chucks and the workpiece surface, thus preventing indentations or scratches and protecting the workpiece surface from damage.

[0018] In summary, compared with the prior art, this application includes at least one of the following beneficial technical effects: 1. This invention enables multi-station cyclic operation by setting up a turntable with multiple installation stations. When a workpiece is being processed at one station's drilling station, the operator can simultaneously disassemble completed workpieces and clamp workpieces to be processed at other stations. This overlaps the processing time with auxiliary time, significantly shortens auxiliary time, greatly improves the processing efficiency of batch production, and solves the problem of low efficiency caused by single-station operation mentioned in the background art.

[0019] 2. This invention utilizes a positioning plate in the positioning assembly to create a mounting cavity that matches the workpiece, enabling the workpiece to be quickly and accurately positioned at a predetermined location. This ensures the consistency of the mounting reference for each workpiece, thereby guaranteeing the repeatability of the drilling position. Simultaneously, the design of aligning the drill bit axis with the axis of the mounting cavity located at the drilling station mechanically ensures drilling accuracy, eliminating the need for tedious tool setting operations before each machining operation.

[0020] 3. This invention adds an auxiliary clamping device consisting of a rotating component, a telescopic push rod, and chucks. This device can provide auxiliary support to the upper part or specific parts of the workpiece before drilling, especially for slender rod-shaped or high-center-of-gravity locating pins. It can effectively resist the radial and axial forces generated by the drill bit during drilling, suppress the vibration and displacement of the workpiece, greatly improve the stability of the processing, and thus ensure the drilling quality, solving the problem of insufficient clamping stability mentioned in the background art.

[0021] 4. This invention, by incorporating an angle adjuster and an adjustment groove, allows for adjustment of the overall tilt angle and radial position of the positioning plate and chuck. This design enables the same tooling to adapt to the processing requirements of various angled holes and positioning pins of different lengths, greatly expanding the applicability of the tooling and effectively solving the problems of poor versatility and flexibility mentioned in the background art.

[0022] 5. The auxiliary clamping device in this invention employs a combination design of a first telescopic push rod and a second telescopic push rod, with the axes of the first and second telescopic push rods perpendicular to each other. This structure allows the jaws to have two degrees of freedom of movement in space: swinging and translation along the direction of the first telescopic push rod, and radial extension and retraction along the direction of the second telescopic push rod. Combined with the rotational motion of the rotating component, the jaws can achieve flexible spatial positioning, adapting to the clamping requirements of various irregularly shaped workpieces or surfaces, further enhancing the versatility and adaptability of the tooling.

[0023] 6. The first and second telescopic push rods in the auxiliary clamping device are electric or hydraulic push rods, working in conjunction with a servo motor as the rotating component, making the entire auxiliary clamping process easily electrified and automatically controlled. These actuators can be integrated with the drilling machine's control system to achieve automated auxiliary clamping actions, reduce manual intervention, improve the automation level of the production line, and reduce labor costs.

[0024] 7. Anti-slip pads are provided on the inner side of the jaws, which not only increases the friction of clamping and ensures the reliability of clamping, but also effectively prevents the metal jaws from directly contacting the workpiece surface and causing indentations or scratches. This is especially important for precision positioning pins with high surface quality requirements, and protects the finished product quality. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the drilling fixture for the positioning pin of the present invention; Figure 2 For the present invention Figure 1 Enlarged view of point A in the middle; Figure 3 This is a front view of the drilling fixture for the positioning pin of the present invention; Figure 4 This is a top view of the drilling fixture for the positioning pin of the present invention.

[0026] Explanation of reference numerals in the attached drawings: 100, drilling machine; 110, worktable; 200, turntable; 210, installation station; 300, positioning component; 310, mounting base; 311, adjusting groove; 320, chuck; 330, positioning plate; 331, installation cavity; 340, angle adjuster; 400, rotating component; 500, support rod; 600, connecting sleeve; 700, first telescopic push rod; 800, second telescopic push rod; 900, chuck. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will be described in conjunction with the accompanying drawings of the embodiments of the present invention. Figure 1-4 The technical solutions of the embodiments of the present invention will be clearly and completely described herein. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention are within the scope of protection of the present invention.

[0028] Please see Figures 1 to 4 This invention provides a drilling fixture for positioning pins, used for mounting on a worktable 110 on the upper part of the rotating shaft of a drilling machine 100. The core component of this fixture is a turntable 200, which is typically made of high-strength aluminum alloy or cast iron to ensure its rigidity and wear resistance. An interface for connecting to the drive mechanism of the worktable 110 is provided at the lower center of the turntable 200, allowing for intermittent indexing rotation driven by the power of the drilling machine 100. Multiple mounting stations 210 are evenly distributed along the circumferential direction on the upper surface of the turntable 200.

[0029] Each installation station 210 is equipped with an independent positioning assembly 300, which serves as the base for fixing the workpiece to be drilled (i.e., the locating pin blank). Specifically, the positioning assembly 300 includes a mounting base 310, which is bolted to the turntable 200. Above the mounting base 310 is a chuck 320, which can be a commonly used three-jaw chuck 320 or a four-jaw chuck 320, such as the K11 series three-jaw self-centering chuck 320 manufactured by Yantai Machine Tool Accessories Factory, which has a self-centering function and can quickly clamp locating pins with a circular cross-section. For ease of replacement and maintenance, the chuck 320 and the mounting base 310 are detachably connected by bolts.

[0030] like Figure 1 and Figure 3 As shown, a positioning plate 330 is further provided above the chuck 320. The positioning plate 330 is a key component, with a mounting cavity 331 at its center that matches the shape of the workpiece to be drilled. For example, if the positioning pin to be machined is cylindrical, the mounting cavity 331 is a cylindrical groove; if the positioning pin has a flanged structure, the mounting cavity 331 can be designed as a corresponding stepped hole shape. The positioning plate 330 itself is fixedly connected to the jaws 900 of the chuck 320 through the connecting structure at its bottom, ensuring that the positioning plate 330 can be stably fixed on the mounting base 310 as the chuck 320 clamps. During operation, the drill bit axis of the drilling machine 100 is precisely adjusted to coincide with the central axis of the mounting cavity 331 located at the drilling position, thereby ensuring the accuracy of the drilling position.

[0031] To accommodate the machining requirements of angled holes at different angles, an angle adjuster 340 can be installed on the upper part of the mounting base 310. This angle adjuster 340 can be, for example, a worm gear mechanism or a precision rotary table, with its bottom fixed to the mounting base 310 and its top connected to the chuck 320. By manually or automatically adjusting the angle adjuster 340, the chuck 320, together with its positioning plate 330, can be tilted at a certain angle in the vertical plane, thereby enabling the machining of angled holes in the workpiece. Furthermore, the mounting base 310 has a radially extending adjustment groove 311, and the fixed end of the angle adjuster 340 is mounted in this adjustment groove 311 via a slider and locking bolts. After loosening the bolts, the angle adjuster 340 can be slid along the adjustment groove 311 to adjust the radial position of the entire positioning assembly 300 on the turntable 200, accommodating workpieces of different lengths or adjusting the machining area.

[0032] like Figure 4As shown, the number of installation stations 210 is set to twice the number of drilling stations. For example, if the drilling machine 100 can only process one station at a time, two installation stations 210 can be set on the turntable 200; if the drilling machine 100 is equipped with multiple drill bits that can process simultaneously, the number of installation stations 210 increases accordingly. A common configuration is to set six or eight installation stations 210, so that the operator can load and unload workpieces in one area while workpieces in other areas are being processed, realizing assembly line-style parallel operation.

[0033] Please refer to this carefully. Figure 1 and Figure 2 The tooling of this invention also incorporates a novel auxiliary clamping device to further improve stability during the drilling process. This device is mounted on the worktable 110, located on one side of the turntable 200. Its core is a rotating component 400, preferably a servo motor, such as a metal gear servo motor (model MG996R), which provides precise angle control. A support rod 500 is connected upwards to the output end of the servo motor, and a connecting sleeve 600 is fixed to the top of the support rod 500. At least two first telescopic push rods 700 are mounted on the outer wall of the connecting sleeve 600; in this embodiment, two first telescopic push rods 700 are preferred. The housings of these two first telescopic push rods 700 are fixed to the connecting sleeve 600, and their axes intersect on the horizontal plane, with an included angle of 120 degrees.

[0034] Each first telescopic push rod 700 has a second telescopic push rod 800 installed at its output rod end. Both the first and second telescopic push rods 700 can be commercially available electric push rods, such as the XTL100 series miniature electric push rods produced by Wenzhou Sipu Machinery Co., Ltd., which have built-in travel limit switches, a travel range of 50-200mm, and a thrust of up to 500N. Alternatively, hydraulic push rods can be used in applications requiring greater clamping force. The key is that the axial direction of the first telescopic push rod 700 is spatially perpendicular to the axial direction of the second telescopic push rod 800. That is, the telescopic movement of the first telescopic push rod 700 drives the second telescopic push rod 800 to move in an approximately horizontal plane, while the telescopic movement of the second telescopic push rod 800 itself drives the jaw 900 at its end to move in a direction perpendicular to the axis of the first telescopic push rod 700. Through this orthogonal design, the jaw 900 achieves two degrees of freedom of movement. The included angle between the first telescopic push rod 700 and the second telescopic push rod 800 is designed to range from 45 degrees to 120 degrees. In this embodiment, it is preferably 90 degrees, that is, the two are perpendicular to each other, so as to achieve the best spatial motion decoupling effect.

[0035] At the output rod end of each second telescopic push rod 800, a pawl 900 is fixed. The pawl 900 is typically made of steel, and its inner surface in contact with the workpiece is fitted with an anti-slip pad. The anti-slip pad can be made of wear-resistant rubber, such as nitrile rubber, which has good oil resistance and wear resistance, providing sufficient friction while preventing scratches on the workpiece surface.

[0036] The working principle and usage of this invention are as follows: First, select a suitable positioning plate 330 and install it onto the chuck 320 according to the specifications of the positioning pin to be processed. If it is necessary to process an oblique hole, adjust the tilt angle of the chuck 320 and the positioning plate 330 in advance through the angle adjuster 340, and adjust their radial position through the adjusting groove 311, and then lock them.

[0037] In the initial state, the turntable 200 rotates, moving the first vacant mounting station 210 to the loading / unloading area closer to the operator. The operator places the locating pin workpiece to be drilled into the mounting cavity 331 of the locating plate 330 at this station, and then operates the chuck 320 to clamp it. The chuck 320 can be tightened manually with a wrench, or it can be quickly clamped using a pneumatic or hydraulic drive, depending on the type and configuration of the chuck 320.

[0038] The drilling machine 100 is started, and the control system controls the turntable 200 to rotate, precisely delivering the workpiece to the drilling position. At this time, the drill bit axis of the drilling machine 100 coincides with the axis of the mounting cavity 331 on the position.

[0039] Before the drill bit begins to feed and drill, the auxiliary clamping device starts working. First, the servo motor rotates at a certain angle according to a preset program, driving the support rod 500 and the connecting sleeve 600 to rotate, so that the two first telescopic push rods 700 are roughly aligned with the top of the workpiece. Next, the two first telescopic push rods 700 extend, adjusting the horizontal position of the second telescopic push rods 800. Then, the two second telescopic push rods 800 extend, driving their respective jaws 900 to move towards the workpiece until the anti-slip pads on the inner side of the jaws 900 are tightly pressed against the upper sidewall or end face of the workpiece, applying a certain auxiliary clamping force. Because the two first telescopic push rods 700 are at a 120-degree angle, the two jaws 900 support the workpiece from different directions, forming a stable triangular support effect, effectively preventing the workpiece from deflecting or vibrating during drilling.

[0040] After the auxiliary clamping device is in place, the drill bit of the drilling machine 100 feeds downward to drill the workpiece. During the drilling process, the workpiece maintains good stability due to the support of the auxiliary clamping device, ensuring drilling position accuracy.

[0041] After drilling is completed, the drill bit retracts. Subsequently, the auxiliary clamping device reverses its action: the second telescopic push rod 800 retracts, releasing the chuck 900; the first telescopic push rod 700 retracts; the servo motor reverses, resetting the support rod 500 and the chuck 900 to their initial positions so as not to interfere with the rotation of the turntable 200.

[0042] The turntable 200 rotates again, sending the finished workpiece to the loading and unloading area, and simultaneously sending a station with a new workpiece to the drilling station, starting the next cycle. While processing is being carried out at the drilling station, the operator can unload the finished workpiece in the loading and unloading area and clamp new blanks, achieving uninterrupted operation.

[0043] When processing workpieces of different specifications, simply replace the corresponding positioning plate 330 and make fine adjustments using the angle adjuster 340 and adjustment groove 311 to quickly adapt to the new processing task. If the workpiece has a special shape, the control program can be modified to adjust the rotation angle of the servo motor and the extension length of each telescopic push rod, so that the chuck 900 can accurately clamp in the predetermined position.

[0044] It should be noted that the control of each electrical component in this fixture can be achieved through a programmable logic controller (PLC). The PLC can be a Siemens S7-200 series. By writing the corresponding control program, the indexing rotation of the turntable 200, the angle control of the servo motor, the extension sequence and stroke control of each telescopic push rod, and the linkage control with the spindle of the drilling machine 100 can be realized, thereby achieving automated operation of the entire drilling process.

[0045] In summary, this invention achieves efficient and precise batch drilling by combining a multi-station turntable 200 with a quick-change positioning component 300. By adding an auxiliary clamping device with multi-degree-of-freedom adjustment capabilities, the stability of the machining process is significantly improved, making it particularly suitable for slender, irregularly shaped, or high-precision positioning pin parts. Its structural design is reasonable, its adjustment is flexible, and its degree of automation is high, effectively solving many problems existing in the prior art.

[0046] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0047] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A drilling fixture for positioning pins, comprising a turntable (200) mounted on a worktable (110) on the upper part of the rotating shaft of a drilling machine (100), characterized in that, The turntable (200) is provided with a plurality of installation stations (210) distributed along the circumferential direction. Each installation station (210) is provided with a positioning component (300) for fixing the workpiece. The positioning component (300) includes a mounting base (310), a chuck (320) and a positioning plate (330). The chuck (320) is set on the mounting base (310), and the positioning plate (330) is set on the chuck (320). The positioning plate (330) has an installation cavity (331) adapted to the workpiece to be drilled. The axis of the drill bit of the drilling machine (100) coincides with the axis of the installation cavity (331) located on the drilling station.

2. The drilling fixture for the positioning pin as described in claim 1, characterized in that: The workbench (110) is also provided with a rotating component (400). The output end of the rotating component (400) is provided with a support rod (500). The upper part of the support rod (500) is provided with a connecting sleeve (600). At least two first telescopic push rods (700) are provided on the outside of the connecting sleeve (600). The output rod end of each first telescopic push rod (700) is provided with a second telescopic push rod (800). The output rod end of each second telescopic push rod (800) is provided with a pawl (900). The included angle between at least two first telescopic push rods (700) and second telescopic push rods (800) is 45-120 degrees. The axial direction of the first telescopic push rod (700) is perpendicular to the axial direction of the second telescopic push rod (800).

3. The drilling fixture for the positioning pin as described in claim 2, characterized in that: The rotating component (400) is a servo motor.

4. The drilling fixture for the locating pin as described in claim 2, characterized in that: Both the first telescopic push rod (700) and the second telescopic push rod (800) are electric push rods or hydraulic push rods.

5. The drilling fixture for the positioning pin as described in claim 1, characterized in that: An angle adjuster (340) is also provided on the upper part of the mounting base (310), and the bottom of the chuck (320) is provided on the angle adjuster (340). The angle adjuster (340) can adjust the tilt angle of the chuck (320).

6. The drilling fixture for the locating pin as described in claim 5, characterized in that: The mounting base (310) is provided with an adjustment groove (311), and the fixed end of the angle adjuster (340) is slidably disposed in the groove.

7. The drilling fixture for the locating pin as described in claim 1, characterized in that: The number of installation stations (210) is equal to twice the number of drilling stations.

8. The drilling fixture for the positioning pin as described in claim 2, characterized in that: There are two first telescopic push rods (700), and the included angle between the axes of the two first telescopic push rods (700) is 120 degrees.

9. The drilling fixture for the locating pin as described in claim 1, characterized in that: The chuck (320) is a three-jaw chuck (320) or a four-jaw chuck (320), and the chuck (320) is detachably connected to the mounting base (310) by bolts.

10. The drilling fixture for the locating pin as described in claim 2, characterized in that: The inner side of the claw (900) is provided with an anti-slip pad.

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