Ring body drilling precision positioning tool

Abstract

The utility model relates to circle body processing technical field especially is related to a circle body drilling precision positioning frock, specifically includes: the top surface of work head is provided with the centring bolt subassembly, is provided with three jaw linkage chuck body on the centring bolt subassembly, is provided with three mutually linked chuck claw that can move radially on three jaw linkage chuck body, three chuck claws even arrange along the circumferential direction of three jaw linkage chuck body, every chuck claw all is provided with a fixed block, the fixed block is connected with the one end of sleeve assembly, the other end of sleeve assembly is provided with the clamping assembly, the top of centring disc is provided with the stud, the stud is connected with three jaw linkage chuck body, the bottom of centring disc is provided with the locating shaft, is provided with the locating sleeve on work head, the locating shaft and locating sleeve interference fit. Solveed that the large circle body is easy to cause the micro shift because of uneven stress in the processing, leads to the big hole position circumferential distribution error, the aperture precision is poor, influences the subsequent assembly problem of large circle body.

Description

Technical Field

[0001] This utility model relates to the field of ring body processing technology, and in particular to a precision positioning tool for drilling ring bodies. Background Technology

[0002] Ring-shaped components are widely used in fields such as machinery manufacturing, wind power equipment, and construction machinery. Examples include large rings such as bearing outer rings, flange rings, and wind turbine tower connecting rings. These components typically require multiple precise holes machined along their circumference to meet subsequent assembly and functional requirements. The precision and efficiency of drilling directly determine product quality and production schedule. Currently, the industry mostly uses traditional tooling to deal with large ring bodies. However, due to the large size and weight of large ring bodies, traditional tooling relies solely on manual alignment or pressure plate fixing, which makes it difficult to ensure that the center of the large ring body is coaxial with the processing datum. Therefore, during the processing, the large ring body is prone to slight displacement due to uneven force, resulting in large circumferential distribution error of hole positions and poor hole diameter accuracy, which affects the subsequent assembly of the large ring body.

[0003] Therefore, how to provide a precise positioning fixture for drilling large rings to ensure that the center of the large ring is coaxial with the machining datum during the machining process, reduce the large circumferential distribution error of the hole position, and ensure the accuracy of the hole diameter for subsequent assembly of the large ring is an urgent technical problem to be solved. Utility Model Content

[0004] This utility model provides a precision positioning fixture for drilling holes in rings, which solves the problem that large rings are prone to slight displacement due to uneven force during processing, resulting in large circumferential distribution errors of hole positions and poor hole diameter accuracy, which affects the subsequent assembly of large rings.

[0005] This utility model provides a precision positioning fixture for drilling a ring, comprising: a worktable, a centering bolt assembly on the top surface of the worktable, a three-jaw linkage chuck body on the centering bolt assembly, three interconnected and radially movable chuck jaws on the three-jaw linkage chuck body, the three chuck jaws being evenly arranged along the circumference of the three-jaw linkage chuck body, each chuck jaw being provided with a fixing block, the fixing block being connected to one end of a sleeve assembly, and a clamping assembly being provided at the other end of the sleeve assembly; The centering bolt assembly includes a centering disc, a stud, a positioning shaft, and a positioning sleeve. The stud is located at the top of the centering disc and is connected to the three-jaw linkage chuck body. The positioning shaft is located at the bottom of the centering disc, and the positioning sleeve is located on the worktable. The positioning shaft and the positioning sleeve are interference-fitted. When the centering disc is connected to the worktable, the positioning shaft is inserted into the positioning sleeve to center the centering disc on the worktable.

[0006] In one possible implementation, the sleeve assembly includes a sleeve connecting plate, a sleeve body, and an extended inner tube. The sleeve connecting plate is disposed on the fixing block and connected to one end of the sleeve body. The sleeve body has a cavity, and the extended inner tube is inserted into the cavity from the other end of the sleeve body. The extended inner tube is detachably connected to the sleeve body, and the end of the extended inner tube away from the sleeve body is connected to the clamping assembly.

[0007] In one possible implementation, the sleeve assembly further includes a fixing pin, a first fixing hole is provided on the sleeve body, a second fixing hole is provided on the extended inner tube, and the fixing pin passes through the first fixing hole and the second fixing hole to fix the extended inner tube in the sleeve body.

[0008] In one possible implementation, the clamping assembly includes a limiting shaft and a positioning plate. The limiting shaft is detachably disposed at one end of the extended inner tube away from the sleeve body. The limiting shaft passes through a first limiting hole on the extended inner tube and a second limiting hole on the positioning plate and is connected to the positioning plate. The limiting shaft at least partially extends out of the positioning plate.

[0009] In one possible implementation, the positioning plate is provided with a first mounting hole, the extended inner tube is provided with a guide hole, and the guide hole is located between the sleeve body and the limiting shaft, close to the limiting shaft. A perforated guide pin passes through the guide hole and the first mounting hole.

[0010] In one possible implementation, the positioning plate is provided with a second mounting hole, and a guide sleeve is provided in the second mounting hole.

[0011] In one possible implementation, a wear-resistant bushing is provided on the outer wall of the retaining pin.

[0012] In one possible implementation, the top block of the positioning sleeve is provided with a limiting ring, the worktable is provided with a positioning hole, and when the positioning sleeve is inserted into the positioning hole, the limiting ring engages with the inner wall of the positioning hole.

[0013] In one possible implementation, the centering plate is provided with a countersunk hole, and the positioning shaft passes through the countersunk hole and the positioning sleeve to fix the centering plate on the worktable.

[0014] In one possible implementation, the sleeve connecting plate is connected to the sleeve body by welding, and the extended inner tube is a hollow tube.

[0015] The beneficial effects of this utility model are as follows: First, the workbench is placed in the processing position, and the large ring body is placed on the workbench using a hoisting device, so that the center of the large ring body is roughly aligned with the centering plate. Then, the three-jaw linkage chuck body is activated, controlling the three chuck jaws to retract inward synchronously, and the fixing block to move radially synchronously, driving the sleeve assembly to move. This, in turn, causes the clamping assembly to move the large ring body towards the center until all three clamping assemblies are tightly fitted against the outer wall of the large ring body, completing the precise centering of the large ring body. Next, the drilling equipment is activated to drill holes in the large ring body. Finally, after processing is completed, the three-jaw linkage chuck body is activated in reverse, the chuck jaws open outward, and the fixing block moves radially synchronously, driving the sleeve assembly to move, thus causing the clamping assembly to detach from the large ring body. This solves the problem that large ring bodies are prone to slight displacement due to uneven force during processing, leading to large circumferential distribution errors in hole positions and poor hole diameter accuracy, which affects subsequent assembly of the large ring body. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a perspective view of a precision positioning tool for drilling holes in a ring body, which is used in conjunction with a large ring body according to this utility model. Figure 2 This is a cross-sectional perspective view of a ring-shaped drilling precision positioning tool that is used in conjunction with a large ring. Figure 3 This is an enlarged perspective view of area A of a ring-shaped drilling precision positioning fixture according to the present invention. Figure 4 This is an enlarged perspective view of area B of the ring-shaped drilling precision positioning tool of this utility model. Figure 5 This is a perspective view of the clamping assembly of a precision positioning fixture for drilling holes in a ring, according to this utility model. Figure 6 This is a perspective view of the fixing block and sleeve assembly of a ring-shaped drilling precision positioning fixture according to this utility model.

[0018] Explanation of reference numerals in the attached figures: 1. Workbench; 2. Centering bolt assembly; 201. Centering plate; 202. Stud; 203. Positioning shaft; 204. Positioning sleeve; 3. Three-jaw linkage chuck body; 4. Chuck jaws; 5. Fixing block; 6. Sleeve assembly; 601. Sleeve connecting plate; 602. Sleeve body; 603. Extended inner tube; 604. Fixing pin; 7. Clamping assembly; 701. Limiting shaft; 702. Positioning plate; 8. Cavity; 9. First fixing hole; 10. Second fixing hole; 11. First limiting hole; 12. Second limiting hole; 13. First mounting hole; 14. Guide hole; 15. Guide pin with hole; 16. Second mounting hole; 17. Guide sleeve; 18. Wear-resistant bushing; 19. Limiting ring; 20. Positioning hole; 21. Countersunk hole; 22. Large ring body. Detailed Implementation

[0019] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0020] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" 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 utility model based on the specific circumstances.

[0022] See Figure 1 , Figure 2 and Figure 3 This utility model provides a precision positioning fixture for drilling a ring, comprising: a worktable 1, a centering bolt assembly 2 on the top surface of the worktable 1, a three-jaw linkage chuck body 3 on the centering bolt assembly 2, three interconnected and radially movable chuck jaws 4 on the three-jaw linkage chuck body 3, the three chuck jaws 4 being evenly arranged along the circumference of the three-jaw linkage chuck body 3, and each chuck jaw 4 having a fixing block 5 connected to one end of a sleeve assembly 6, the other end of which is provided with a clamping assembly. 7. The centering bolt assembly 2 includes a centering disc 201, a stud 202, a positioning shaft 203, and a positioning sleeve 204. The top of the centering disc 201 is provided with a stud 202, which is connected to the three-jaw linkage chuck body 3. The bottom of the centering disc 201 is provided with a positioning shaft 203, and the worktable 1 is provided with a positioning sleeve 204. The positioning shaft 203 and the positioning sleeve 204 are interference-fitted. When the centering disc 201 is connected to the worktable 1, the positioning shaft 203 is inserted into the positioning sleeve 204 to center the centering disc 201 on the worktable 1.

[0023] The worktable 1 is a rectangular or circular metal platform. The center of the top surface of the worktable 1 is connected to the centering disk 201. The clamping assembly 7 is used to abut against the outer side wall of the top of the large ring body 22. The fixing block 5 is connected to the chuck claw 4 by high-strength bolts.

[0024] Specifically, first, the workbench 1 is placed in the processing position, and the large ring 22 is placed on the workbench 1 using a hoisting device, so that the center of the large ring 22 is roughly aligned with the centering plate 201. Then, the three-jaw chuck body 3 is activated, controlling the three chuck jaws 4 to retract inwards synchronously, and the fixing block 5 to move radially synchronously, driving the sleeve assembly 6 to move. This, in turn, causes the clamping assembly 7 to move the large ring 22 towards the center until all three clamping assemblies 7 are tightly fitted against the outer wall of the large ring 22, completing the precise centering of the large ring 22. Next, the drilling equipment is activated to drill a hole in the large ring 22. Finally, after processing is completed, the three-jaw chuck body 3 is activated in reverse, the chuck jaws 4 open outwards, and the fixing block 5 moves radially synchronously, driving the sleeve assembly 6 to move, thus causing the clamping assembly 7 to disengage from the large ring 22.

[0025] The fixed block 5 and three chuck jaws 4 together form a three-point positioning and three-point clamping structure, which, together with the centering bolt assembly 2, the three-jaw linkage chuck body 3, the sleeve assembly 6, and the clamping assembly 7, performs a single positioning of the large ring body 22. This ensures that the large ring body 22 is subjected to uniform force, avoiding large circumferential distribution errors and poor hole diameter accuracy caused by force distribution. This prevents the large ring body 22 from requiring repeated hole repairs during subsequent assembly, or even scrapping the large ring body 22, thus affecting product consistency. Compared with most tooling methods that process the large ring body 22 in stages by moving the workpiece, this method saves operation steps, avoids cumulative errors, and improves processing accuracy.

[0026] Preferably, when the three-jaw linkage chuck body 3 is connected to the centering plate 201, the three-jaw linkage chuck body 3 and the centering plate 201 are reinforced by screw connection to ensure a stable connection. At the same time, the center of the three-jaw linkage chuck body 3 and the centering plate 201 are coaxial, providing a stable reference for subsequent tooling component installation and ensuring overall positioning accuracy. The side of the fixing block 5 facing the ring body is machined with anti-slip texture.

[0027] It should be noted that the specific driving principle and working method of the three-jaw linkage chuck body 3 and chuck jaws 4 are known to those skilled in the art. The three-jaw linkage chuck body 3 and chuck jaws 4 are both known components, and this application has not made any improvements to them. Therefore, they will not be described in detail here.

[0028] See Figure 6 In some embodiments, the sleeve assembly 6 includes a sleeve connecting plate 601, a sleeve body 602, and an extension inner tube 603. The sleeve connecting plate 601 is disposed on the fixing block 5 and is connected to one end of the sleeve body 602. The sleeve body 602 has a cavity 8 inside. The extension inner tube 603 is inserted into the cavity 8 from the other end of the sleeve body 602 and is detachably connected to the sleeve body 602. The end of the extension inner tube 603 away from the sleeve body 602 is connected to the clamping assembly 7.

[0029] The detachable connection between the extended inner tube 603 and the sleeve body 602 allows for flexible adjustment of the relative position between the clamping assembly 7 and the large ring body 22, accommodating the processing needs of large ring bodies 22 with different diameters or thicknesses and improving the adaptability of processing large ring bodies 22 in multiple specifications. Compared to dedicated tooling for large ring bodies 22 with fixed specifications, no separate design is required, reducing manufacturing costs and inventory pressure. This enhances the company's production flexibility and market competitiveness.

[0030] In some embodiments, the sleeve assembly 6 further includes a fixing pin 604, a first fixing hole 9 is provided on the sleeve body 602, and a second fixing hole 10 is provided on the extended inner tube 603. The fixing pin 604 passes through the first fixing hole 9 and the second fixing hole 10 to fix the extended inner tube 603 inside the sleeve body 602.

[0031] Among them, under the high cutting force of machining the large ring body 22, the fixing pin 604 prevents the extension inner tube 603 from being relatively displaced from the sleeve body 602, eliminates the deviation of the clamping assembly 7 on the large ring body 22 caused by vibration, and ensures the positional stability of the clamping assembly 7 on the large ring body 22.

[0032] See Figure 4 and Figure 5 In some embodiments, the clamping assembly 7 includes a limiting shaft 701 and a positioning plate 702. The limiting shaft 701 is detachably disposed at one end of the extended inner tube 603 away from the sleeve body 602. The limiting shaft 701 passes through a first limiting hole 11 on the extended inner tube 603 and a second limiting hole 12 on the positioning plate 702 and is connected to the positioning plate 702. The limiting shaft 701 at least partially extends out of the positioning plate 702.

[0033] The positioning plate 702 is detachably connected to the extension inner tube 603 via the limiting shaft 701, which facilitates the disassembly and replacement of the positioning plate 702. Compared with traditional clamping methods, such as fixing the large ring body 22 one by one with pressure plates or bolts, there is no need to repeatedly adjust the position of the large ring body 22, saving time and effort and greatly improving the production efficiency when batch processing the large ring body 22.

[0034] In some embodiments, the positioning plate 702 is provided with a first mounting hole 13, the extended inner tube 603 is provided with a guide hole 14, and the guide hole 14 is located between the sleeve body 602 and the limiting shaft 701, close to the limiting shaft 701. A perforated guide pin 15 is inserted into the guide hole 14 and the first mounting hole 13.

[0035] When machining the large ring 22, the drill bit of the drilling equipment extends into the channel of the guide pin 15 to perform drilling operations on the large ring 22. The sleeve assembly 6 extends to the outside of the large ring 22, extending the positioning and guiding reference directly forward from near the spindle of the worktable 1, precisely covering the outer machining area of ​​the large ring 22. This allows the drilling equipment to complete the full circumference drilling of the large ring 22 at the extended reference point with only a short stroke, completely avoiding the repeated positioning errors caused by the movement of the large ring 22, and breaking through the limitation of the physical stroke of the drilling equipment on the machining size of the large ring 22.

[0036] In some embodiments, the positioning plate 702 is provided with a second mounting hole 16, and a guide sleeve 17 is provided in the second mounting hole 16. The guide sleeve 17 is interference-fitted into the second mounting hole 16, and the positioning plate 702 achieves limiting and hole pre-positioning through the cooperation between the guide sleeve 17 and the perforated guide pin 15.

[0037] The guide sleeve 17 provides radial guidance for the drilling equipment, restricts the drill bit runout of the drilling equipment, ensures the straightness of the drilling path, and reduces the friction between the drill bit and the positioning plate 702, thus protecting the positioning plate 702. In the deep hole machining of large ring 22, it effectively avoids hole diameter enlargement or hole wall roughness.

[0038] The cooperation between the guide sleeve 17 and the perforated guide pin 15 enables the large ring 22 to provide precise guidance for all drilling operations after one positioning, without the need for repeated alignment, so as to meet the preset position of the hole group.

[0039] In some embodiments, a wear-resistant bushing 18 is provided on the outer side wall of the retaining pin 604.

[0040] The wear-resistant bushing 18 can reduce the wear between the fixing pin 604 and the first fixing hole 9 and the second fixing hole 10, avoid the increase in installation gap caused by long-term use of the fixing pin 604, ensure the installation accuracy of the positioning plate 702 at one end of the extension inner tube 603, and extend the service life.

[0041] In some embodiments, the top block of the positioning sleeve 204 is provided with a limiting ring 19, and the worktable 1 is provided with a positioning hole 20. When the positioning sleeve 204 is inserted into the positioning hole 20, the limiting ring 19 engages with the inner wall of the positioning hole 20.

[0042] The limiting ring 19 engages with the positioning hole 20 to restrict the axial displacement of the positioning sleeve 204. The centering plate 201 is fixed to the positioning sleeve 204 by an interference fit through the positioning shaft 203. This prevents the positioning sleeve 204 from shifting due to the axial force borne by the tooling during the machining of the large ring body 22, ensuring that the positioning reference of the centering plate 201 and the three-jaw linkage chuck body 3 on the worktable 1 remains unchanged, and avoiding errors in the drilling position due to the offset of the positioning reference.

[0043] In some embodiments, the centering disk 201 is provided with a countersunk hole 21, and the positioning shaft 203 passes through the countersunk hole 21 and the positioning sleeve 204 to fix the centering disk 201 on the worktable 1.

[0044] The top of the positioning shaft 203 is interference-fitted with the countersunk hole 21 of the centering plate 201. When the centering plate 201 is connected to the worktable 1, the positioning shaft 203 passes through the countersunk hole 21 and the positioning sleeve 204 in sequence to center the centering plate 201 on the worktable 1. Then, the connection between the centering plate 201 and the worktable 1 is further strengthened by screw connection.

[0045] The countersunk hole 21 makes the positioning shaft 203 protrude from the top surface of the centering plate 201, ensuring that the mounting surface of the three-jaw linkage chuck body 3 is flat, avoiding the large ring body 22 from being clamped and deformed due to uneven mounting surface, providing a stable and reliable machining reference surface for the large ring body 22, and ensuring the verticality of drilling.

[0046] In some embodiments, the sleeve connecting plate 601 and the sleeve body 602 are connected by welding, and the extended inner tube 603 is a hollow tube. Preferably, the extended inner tube 603 is a hollow metal tube. The welded connection ensures the structural strength of the sleeve connecting plate 601 and the sleeve body 602 under high cutting forces, and the hollow tube reduces the overall weight of the sleeve assembly 6, reducing the load on the chuck jaws 4 and the fixing block 5.

[0047] Work process First, based on the outer diameter specifications of the large ring body 22 to be processed, select an extension inner tube 603 of suitable length, and fix the sleeve body 602 and the extension inner tube 603 by inserting the fixing pin 604 into the first fixing hole 9 and the second fixing hole 10. At the same time, select the positioning plate 702 of the required hole position for later use.

[0048] Subsequently, the large ring body 22 is placed on the workbench 1 using a hoisting device, so that the center of the large ring body 22 is roughly aligned with the centering plate 201. The three-jaw linkage chuck body 3 is activated, controlling the three linkage chuck jaws 4 to retract inward synchronously. The fixing block 5 moves radially with the chuck jaws 4, driving the sleeve assembly 6 and the clamping assembly 7 to move synchronously towards the center, until the three limit shafts 701 and the three positioning plates 702 are all tightly fitted with the outer wall of the large ring body 22, completing the precise centering of the large ring body 22.

[0049] Next, the limiting shaft 701 is inserted into the first limiting hole 11 and the second limiting hole 12, and the positioning plate 702 is fixed to the outer end of the extended inner tube 603. Then, the perforated guide pin 15 is passed through the guide hole 14 and the first mounting hole 13. At this time, the guide sleeve 17 on the positioning plate 702 fits against the upper wall of the large ring body 22 to achieve radial limiting, and the perforated guide pin 15 is aligned with the preset drilling position of the large ring body 22.

[0050] Finally, the drilling equipment is started, and the drill bit moves down along the channel of the perforated guide pin 15, and drills the large ring body 22 backward through the guide sleeve 17. After processing, the three-jaw linkage chuck body 3 is started in reverse, controlling the three linkage chuck jaws 4 to open outward synchronously. The fixing block 5 drives the sleeve assembly 6 and the clamping assembly 7 to disengage from the large ring body 22. The limit shaft 701 and the perforated guide pin 15 are disassembled, the positioning plate 702 is removed, and finally the processed large ring body 22 is lifted away by the hoisting equipment. When changing to a different specification of large ring body 22, it is only necessary to remove the fixing pin 604, replace the extension inner tube 603 of the appropriate length, and replace the positioning plate 702 of the corresponding hole position and guide sleeve 17. The above operation can be repeated to achieve rapid changeover and multi-specification processing adaptation.

[0051] In the above embodiments, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0052] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0053] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "method," "specific method," or "some methods," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or method is included in at least one embodiment or method of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or method. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or methods. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or methods described in this specification, as well as the features of different embodiments or methods.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A precision positioning fixture for drilling holes in a ring, characterized in that, include: A workbench is provided with a centering bolt assembly on its top surface. A three-jaw linkage chuck body is provided on the centering bolt assembly. The three-jaw linkage chuck body is provided with three interconnected and radially movable chuck jaws. The three chuck jaws are evenly arranged along the circumference of the three-jaw linkage chuck body. Each chuck jaw is provided with a fixing block. The fixing block is connected to one end of a sleeve assembly. The other end of the sleeve assembly is provided with a clamping assembly. The centering bolt assembly includes a centering disc, a stud, a positioning shaft, and a positioning sleeve. The stud is located at the top of the centering disc and is connected to the three-jaw linkage chuck body. The positioning shaft is located at the bottom of the centering disc, and the positioning sleeve is located on the worktable. The positioning shaft and the positioning sleeve are interference-fitted. When the centering disc is connected to the worktable, the positioning shaft is inserted into the positioning sleeve to center the centering disc on the worktable.

2. The precision positioning fixture for drilling holes in a ring body according to claim 1, characterized in that, The sleeve assembly includes a sleeve connecting plate, a sleeve body, and an extension inner tube. The sleeve connecting plate is disposed on the fixing block and is connected to one end of the sleeve body. The sleeve body has a cavity. The extension inner tube is inserted into the cavity from the other end of the sleeve body and is detachably connected to the sleeve body. The end of the extension inner tube away from the sleeve body is connected to the clamping assembly.

3. The precision positioning fixture for drilling holes in a ring body according to claim 2, characterized in that, The sleeve assembly further includes a fixing pin. The sleeve body is provided with a first fixing hole, and the extended inner tube is provided with a second fixing hole. The fixing pin passes through the first fixing hole and the second fixing hole to fix the extended inner tube in the sleeve body.

4. The precision positioning fixture for drilling holes in a ring body according to claim 2, characterized in that, The clamping assembly includes a limiting shaft and a positioning plate. The limiting shaft is detachably disposed at one end of the extended inner tube away from the sleeve body. The limiting shaft passes through a first limiting hole on the extended inner tube and a second limiting hole on the positioning plate and is connected to the positioning plate. The limiting shaft at least partially extends out of the positioning plate.

5. The precision positioning fixture for drilling holes in a ring body according to claim 4, characterized in that, The positioning plate is provided with a first mounting hole, and the extended inner tube is provided with a guide hole. The guide hole is located between the sleeve body and the limiting shaft, close to the limiting shaft. A perforated guide pin passes through the guide hole and the first mounting hole.

6. The precision positioning fixture for drilling holes in a ring body according to claim 5, characterized in that, The positioning plate is provided with a second mounting hole, and a guide sleeve is provided in the second mounting hole.

7. The precision positioning fixture for drilling holes in a ring body according to claim 3, characterized in that, A wear-resistant bushing is provided on the outer wall of the fixing pin.

8. The precision positioning fixture for drilling holes in a ring body according to claim 1, characterized in that, The top block of the positioning sleeve is provided with a limiting ring, and the worktable is provided with a positioning hole. When the positioning sleeve is inserted into the positioning hole, the limiting ring engages with the inner wall of the positioning hole.

9. The precision positioning fixture for drilling holes in a ring body according to claim 1, characterized in that, The centering plate is provided with a countersunk hole, and the positioning shaft passes through the countersunk hole and the positioning sleeve to fix the centering plate on the worktable.

10. The precision positioning fixture for drilling holes in a ring body according to claim 2, characterized in that, The sleeve connecting plate is connected to the sleeve body by welding, and the extended inner tube is a hollow tube.

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