A positioning device for a headphone boom arm

Abstract

The utility model provides a kind of positioning device of headset stretching arm, including positioning seat, the positioning pin of being set on positioning seat, the fixture for clamping workpiece of being set on positioning seat and the work station pin of being set on numerical control machine tool work station;Clamp includes pedestal, the clamping plate of being slidably arranged on pedestal for clamping fixed workpiece, the driving assembly for driving clamping plate clamping or loosening workpiece;Positioning hole is opened in pedestal, positioning pin, work station pin are all with the transition cooperation of positioning hole;Groove is opened in pedestal, when clamping plate moves along workpiece direction, clamping plate gradually covers the part opening of groove and forms profiling groove, the shape of profiling groove is matched with the shape of the part on workpiece without being cut portion;Limiting portion for limiting workpiece end face is formed on positioning seat, and the shape of limiting portion is matched with workpiece end face.The utility model has the advantages of higher positioning accuracy, can effectively improve processing efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of headphone manufacturing, and in particular to a positioning device for the extension arm of a headphone. Background Technology

[0002] Currently, there is a type of over-ear headphone that, in order to ensure wearing comfort and stability by adjusting the length of the headband, usually has a sliding or telescopic extension arm at the connection between the headband and the earcups. The extension arm can flexibly extend and retract along the length of the headband, thereby realizing the adjustment of the overall length of the headband to adapt to different head shapes and wearing needs.

[0003] Depending on the design and usage requirements of the headphones, the shape of the extension arm often varies. The production of the extension arm typically involves a series of processes, including workpiece manufacturing and cutting. In the cutting stage, current technology often uses CNC machine tools for machining. The desired extension arm shape is obtained by positioning and mounting the workpiece on a CNC machine tool for cutting. Due to the complex structure of the extension arm, a single cutting operation is insufficient to achieve the desired effect; therefore, a single workpiece usually requires multiple cutting operations. Specifically, a single workpiece needs to be positioned and clamped at different stations on different CNC machine tools, or positioned and clamped at different stations on the same CNC machine tool, to perform cutting operations on different parts or angles of the workpiece. This involves multiple transfers and positioning and machining operations to ultimately obtain the required extension arm shape.

[0004] However, when multiple installations and positioning clamps are used, the workpieces are easily bumped and knocked during manual disassembly and reassembly. This is especially true for workpieces with anodized surfaces. In addition, repeated clamping can easily cause positioning deviations, which directly lead to low machining accuracy of the stretching arm. The current deviation is ±0.05-0.2mm, ultimately resulting in defective finished stretching arms. Utility Model Content

[0005] In order to improve the problems of workpiece collision and positioning error caused by multiple disassembly and reassembly in the existing processing, this utility model provides a headphone stretching arm positioning device with higher positioning accuracy and can effectively improve processing efficiency.

[0006] The present invention provides a positioning device for the extension arm of a headphone, which adopts the following technical solution:

[0007] A positioning device for a headphone extension arm includes a positioning seat, a positioning pin disposed on the positioning seat, a clamp disposed on the positioning seat for clamping a workpiece, and a station pin disposed on a CNC machine tool station; the clamp includes a base, a clamping plate for clamping and fixing the workpiece, and a driving assembly for driving the clamping plate to clamp or release the workpiece.

[0008] The base has positioning holes, and the positioning pins and station pins are transitionally fitted with the positioning holes; the base has slots, and when the clamping plate moves along the direction of clamping the workpiece, the clamping plate gradually covers part of the opening of the slot and forms a contour groove, the shape of which matches the shape of the part of the workpiece that does not need to be cut; the positioning seat has a limiting part for limiting the end face of the workpiece, and the limiting part matches the shape of the end face of the workpiece.

[0009] By adopting the above technical solution, during use, the positioning seat is connected to the base by inserting the positioning pin into the positioning hole, so as to determine the spatial position of the limiting part and the base. By placing the part of the workpiece that does not need to be cut in the slot and abutting the end face of the workpiece against the limiting part, the clamping plate is driven by the drive assembly to clamp the workpiece, and the workpiece is clamped and fixed in the contour groove, so as to achieve precise positioning of the workpiece, prevent the workpiece from shaking during cutting and shaping, and at the same time, the part of the workpiece to be processed can be fully exposed, which facilitates the machine tool to perform cutting processing.

[0010] During cutting, the locating pin is disengaged from the locating hole, separating the fixture from the locating seat. The stationary pin then extends into the locating hole, precisely and quickly mounting the fixture at the workstation. The CNC machine tool then performs the cutting and shaping. When changing cutting steps, the fixture is transferred, allowing the stationary pin at the next workstation to extend into the locating hole. This eliminates the need to remove the workpiece from the fixture; the workpiece is clamped in the fixture only once. This helps prevent workpiece damage, ensures the accuracy of the finished product, and the fixture transfer is convenient and quick, reducing disassembly and assembly time and thus improving processing efficiency.

[0011] Preferably, the positioning seat includes a base and a positioning block disposed on the base, the positioning pin is disposed on the base, the positioning pin and the positioning block are both located on the same side of the base, and the limiting part is located on the positioning block.

[0012] By adopting the above technical solution, a base is used to provide a stable bearing foundation to facilitate the connection of fixtures and ensure the precise positioning of fixtures. The positioning block provides a limiting part with a limiting function, which can form a precise constraint on the end face of the workpiece, thereby improving the accuracy and efficiency in the processing or assembly process.

[0013] Preferably, the side of the base away from the positioning hole is an arc-shaped side, and the arc-shaped side has the same curvature as the workpiece.

[0014] By adopting the above technical solution, precise installation direction guidance can be provided for workpieces with curvature.

[0015] Preferably, the limiting part is an inclined surface.

[0016] By adopting the above technical solution, for flat workpieces with end faces, and when the workpiece is placed in the slot, the end faces of the workpiece all face downwards. The inclined limiting part can accurately fit with the end face of the workpiece, achieving rapid positioning and reducing manual adjustment steps.

[0017] Preferably, the drive assembly includes a bolt passing through the clamp plate; the bolt includes a lead screw and a bolt head located at one end of the lead screw, the base has a threaded hole, the lead screw and the threaded hole are threadedly engaged, and the lead screw passes through the clamp plate and extends into the threaded hole.

[0018] By adopting the above technical solution, during driving, the bolt head is rotated, which drives the lead screw to rotate, allowing the bolt to extend into or out of the screw hole. At the same time, the friction between the clamping plate and the lead screw drives the clamping plate to move synchronously, which can easily clamp or loosen the clamping plate.

[0019] Preferably, the drive assembly further includes a guide post disposed on the clamping plate; one end of the guide post is fixed to the clamping plate, a guide groove is provided on the base, and the end of the guide post facing away from the clamping plate extends into the guide groove, and the guide post and the guide groove slide together.

[0020] By adopting the above technical solution, when the clamping plate moves, it drives the guide column to move. The guide column slides in the guide groove, guiding the movement direction of the clamping plate, making the movement of the clamping plate more stable, and improving the accuracy and smoothness of the clamping plate operation.

[0021] Preferably, the base has two slots, which are mirror images of each other; the number of clamping plates corresponds to the number of slots, and the two clamping plates clamp or release the workpieces on the two slots respectively; the number of driving components corresponds to the number of clamping plates, and the two sets of driving components drive the two clamping plates respectively.

[0022] By adopting the above technical solution, the fixture can be positioned to hold two workpieces simultaneously, so that the two workpieces can be cut synchronously in the future, thereby improving work efficiency.

[0023] Preferably, the workstation pin and the positioning pin have completely identical structures.

[0024] By adopting the above technical solutions, the diversity of parts types can be reduced, which facilitates standardized production and procurement and reduces the complexity of inventory management.

[0025] Preferably, there are two positioning holes, which are spaced apart; there are two positioning pins corresponding to the positioning holes, and the two positioning pins are in a transition fit with the two positioning holes; there are two station pins on a single station, and the two station pins on a single station are in a transition fit with the two positioning holes.

[0026] By adopting the above technical solution, two positioning holes, two positioning pins, and two station pins are set, which ensures the stability of the workpiece during the processing at the station, effectively improves the installation accuracy, and avoids errors caused by inaccurate workpiece positioning.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The workpiece only needs to be clamped in the fixture once, which helps to reduce the time spent on disassembly and assembly, avoids the positioning deviation caused by repeated clamping, and the fixture can be transferred quickly and easily. It also helps to prevent the workpiece from being bumped or deformed, ensuring the quality of the finished extension arm and improving processing efficiency.

[0029] 2. The fixture is positioned to hold two workpieces simultaneously, so that the two workpieces can be cut synchronously in the future, thereby improving work efficiency.

[0030] 3. Two positioning holes, two positioning pins, and two station pins are provided to reduce errors caused by inaccurate workpiece positioning, ensure the stability of the workpiece during station processing, effectively improve installation accuracy, and avoid errors caused by inaccurate workpiece positioning. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments 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 based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram showing the relationship between the positioning seat and the clamp in an embodiment of this utility model.

[0033] Figure 2 This is a schematic diagram showing the relationship between the fixture and the workstation pin in an embodiment of this utility model.

[0034] Figure 3 This is a schematic diagram of the positioning hole in an embodiment of this utility model.

[0035] Figure 4 This is a schematic diagram of the stage changes in workpiece cutting in an embodiment of this utility model.

[0036] Figure 5This is a schematic diagram of the structure of the driving component in an embodiment of this utility model.

[0037] Figure 6 This is a schematic diagram of the workpiece being mounted on the fixture in an embodiment of this utility model.

[0038] Figure 7 This is a schematic diagram of the structure of the workpiece after cutting at the first station in an embodiment of this utility model.

[0039] Figure 8 This is a schematic diagram of the structure of the workpiece after cutting at the second station in an embodiment of this utility model.

[0040] The component designations are as follows: 1. Positioning seat; 11. Base; 12. Positioning block; 2. Positioning pin; 3. Fixture; 31. Base; 32. Clamping plate; 33. Bolt; 34. Guide post; 4. Station pin; 5. Positioning hole; 6. Slot; 7. Contour groove; 8. Limiting part; 9. Arc side; 10. Screw hole; 13. Guide slide; 14. Workpiece; 15. Extension arm; 16. First station; 17. Second station. Detailed Implementation

[0041] The following will refer to the appendix in the embodiments of this utility model. Figures 1 to 8 The technical solutions in the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0042] A positioning device for the extension arm of a headset, referring to Figure 1 and Figure 2 It includes an L-shaped positioning seat 1, a positioning pin 2 disposed on the positioning seat 1, a fixture 3 disposed on the positioning seat 1 for clamping the workpiece 14, and a station pin 4 disposed on the CNC machine tool station. The fixture 3 includes a rectangular block-shaped base 31, a clamping plate 32 for clamping and fixing the workpiece 14, and a drive assembly for driving the clamping plate 32 to clamp or release the workpiece 14.

[0043] Reference Figure 1 and Figure 3The base 31 has positioning holes 5, and positioning pins 2 and stationary pins 4 are transitionally fitted into the positioning holes 5. The base 31 has slots 6. When the clamping plate 32 moves along the direction of clamping the workpiece 14, the clamping plate 32 gradually covers part of the opening of the slots 6, forming a contour groove 7. The shape of the contour groove 7 matches the shape of the part of the workpiece 14 that does not need to be cut. Furthermore, the positioning seat 1 has a limiting part 8 for limiting the end face of the workpiece 14, and the limiting part 8 matches the shape of the end face of the workpiece 14.

[0044] In use, the positioning pin 2 is inserted into the positioning hole 5 to connect the positioning seat 1 with the base 31, so as to determine the spatial position of the limiting part 8 and the base 31. By placing the part of the workpiece 14 that does not need to be cut in the slot 6 and abutting the end face of the workpiece 14 against the limiting part 8, the clamping plate 32 is driven by the drive assembly to clamp the workpiece 14, and the workpiece 14 is clamped and fixed in the contour groove 7. This achieves precise positioning of the workpiece 14, prevents the workpiece 14 from shaking during cutting and shaping, and at the same time, the part of the workpiece 14 to be processed can be fully exposed, which is convenient for the machine tool to perform cutting processing.

[0045] During cutting, the locating pin 2 is disengaged from the locating hole 5, causing the fixture 3 to separate from the locating seat 1. The station pin 4 then extends into the locating hole 5, precisely and quickly installing the fixture 3 at the workstation. The CNC machine tool can then perform the cutting and shaping. When changing cutting steps, the fixture 3 is transferred, allowing the station pin 4 at the next workstation to extend into the locating hole 5. This eliminates the need to remove the workpiece 14 from the fixture 3; the workpiece 14 is clamped in the fixture 3 only once. This helps prevent the workpiece 14 from bumping or colliding, ensuring the accuracy of the finished product. Furthermore, the fixture 3 is easily and quickly transferred, reducing disassembly and assembly time and thus improving processing efficiency.

[0046] It should be noted that, referring to Figure 4 In this embodiment, the workpiece 14 is an arc-shaped circular tube with a flat end face. The inner arc side of the middle section of the workpiece 14 is the part that does not need to be cut, while the rest of the workpiece 14 needs to be machined. During the cutting and forming process, the outer arc side of the middle section of the workpiece 14 needs to be cut at the first station. After changing to the second station, the two ends of the workpiece 14 are cut with special shapes to form the required shape of the stretching arm 15.

[0047] Specifically, let's look back. Figure 1 The positioning seat 1 includes a rectangular block-shaped base 11 and a positioning block 12 disposed on the base 11. The positioning block 12 is located on one side of the base 11 and near the end. The positioning block 12 is fixedly connected to the base 11, so that the positioning seat 1 is L-shaped as a whole. In addition, the positioning pin 2 is cylindrical and is disposed on the base 11. The positioning pin 2 and the positioning block 12 are both located on the same side of the base 11.

[0048] Furthermore, refer to Figure 1 and Figure 3 The base 31 is distributed along the length of the base 11. The positioning hole 5 is circular and is located on one side of the base 31. The side of the base 31 facing away from the positioning hole 5 is an arc-shaped side 9, and the arc-shaped side 9 has the same curvature as the workpiece 14, which can provide precise installation direction guidance for the workpiece 14. Since the positioning pin 2 and the positioning hole 5 are in transition fit, when the positioning pin 2 is inserted into the positioning hole 5, the base 31 is connected to the positioning seat 1, and the arc-shaped side 9 faces away from the base 11, with one end of the base 31 facing the positioning block 12.

[0049] Reference Figure 1 and Figure 5 The slot 6 is located at the junction of the arc-shaped side 9 and the adjacent sidewall. The slot 6 is arc-shaped and distributed along the length of the base 31. The slot 6 allows the inner arc side of the middle section of the workpiece 14 to be placed. The clamping plate 32 is a flat plate. The clamping plate 32 moves along the width direction of the base 31 to clamp or release the workpiece 14. When the clamping plate 32 moves in the direction of clamping the workpiece 14, the clamping plate 32 covers the opening on the side of the slot 6 adjacent to the arc-shaped side 9, thereby forming a contour groove 7. The shape of the contour groove 7 matches the shape of the inner arc side of the middle section of the workpiece 14.

[0050] Reference Figure 1 and Figure 5 Since the end face of the workpiece 14 in this embodiment is a plane and the workpiece 14 is arc-shaped, when the inner arc side of the middle section of the workpiece 14 is placed in the slot 6, the end face of the workpiece 14 is facing the downward direction. The limiting part 8 is located on the positioning block 12, and the shape of the limiting part 8 is adapted to the end face of the workpiece 14. The limiting part 8 is an inclined surface.

[0051] Reference Figure 5 and Figure 6 During positioning, the positioning pin 2 is inserted into the positioning hole 5 to connect the positioning seat 1 to the base 31, so as to determine the spatial position of the limiting part 8 and the base 31. By placing the inner arc side of the middle section of the workpiece 14 in the slot 6 and making the end face of the workpiece 14 completely abut against the limiting part 8, the position of the workpiece 14 is quickly determined. Then, the drive assembly drives the clamping plate 32 to clamp the workpiece 14, and the workpiece 14 is clamped and fixed in the contour groove 7. Thus, the limiting part 8 on the positioning seat 1 assists in positioning, and the workpiece 14 is accurately positioned. Moreover, the contour groove 7 can prevent the workpiece 14 from shaking during cutting and shaping. At this time, only the part of the workpiece 14 is grasped and lifted, and the workpiece 14 will not fall off, and the fixture 3 can be lifted synchronously. At the same time, the part of the workpiece 14 to be processed can be fully exposed, which is convenient for the machine tool to perform cutting. In addition, after the cutting is completed, the workpiece 14 can be released by driving the clamping plate 32 through the drive assembly, and the finished product can be taken out.

[0052] Specifically, refer to Figure 3 and Figure 5 The driving assembly includes a bolt 33 passing through a clamping plate 32 and a guide post 34 disposed on the clamping plate 32. The bolt 33 is prior art, comprising a lead screw and a bolt head located at one end of the lead screw. A threaded hole 10 is provided on the base 31, and the lead screw and the threaded hole 10 are threadedly engaged. The lead screw is distributed along the width direction of the base 31, passing through the clamping plate 32 and extending into the threaded hole 10. During driving, by driving the bolt head to rotate, the lead screw is rotated, causing the bolt 33 to extend into or out of the threaded hole 10 along the width direction of the base 31. Simultaneously, the friction between the clamping plate 32 and the lead screw causes the clamping plate 32 to move synchronously, thereby clamping or loosening the clamping plate 32.

[0053] Reference Figure 3 and Figure 5 The guide post 34 is cylindrical and distributed along the width of the base 31, with one end fixed to the clamping plate 32. A guide groove 13, circular in shape, is also provided on the base 31. The end of the guide post 34 facing away from the clamping plate 32 extends into the guide groove 13, and slides along its length in cooperation with the guide groove 13. Thus, when the clamping plate 32 moves, it drives the guide post 34 to move. By sliding the guide post 34 within the guide groove 13, the movement direction of the clamping plate 32 is guided, making the movement of the clamping plate 32 more stable and improving the accuracy and smoothness of its operation.

[0054] During operation, the bolt head is rotated to make the bolt 33 extend into or out of the bolt hole 10 along the width direction of the base 31, and drive the clamping plate 32 and the guide post 34 to move synchronously. This allows the clamping plate 32 to clamp or release the workpiece 14, and the movement of the guide post 34 and clamping plate 32 is more stable, improving the accuracy and smoothness of the operation of the clamping plate 32.

[0055] In addition, refer to Figure 5 and Figure 6 The base 31 has two slots 6, which are mirror-image distributed along the width of the base 31, allowing a single base 31 to hold two workpieces 14. The number of clamping plates 32 corresponds to the number of slots 6, with each clamping plate 32 clamping or releasing the workpiece 14 on one of the two slots 6. Two sets of drive components are provided corresponding to the number of clamping plates 32, driving each clamping plate 32 one by one. This allows the fixture 3 to simultaneously position and hold two workpieces 14, facilitating subsequent synchronous cutting of the two workpieces 14 and improving work efficiency.

[0056] Looking back Figure 1 and Figure 7 The structure of station pin 4 is completely identical to that of positioning pin 2. Figure 8Both the first station 16 and the second station 17 are equipped with station pins 4. The positioning pins 2 and 4 and the positioning holes 5 adopt a transition fit, which can ensure that the two are relatively fixed and facilitate disassembly and maintenance. It is suitable for occasions that require accurate positioning and disassembly.

[0057] Reference Figure 1 During cutting, the locating pin 2 is disengaged from the locating hole 5 by driving the clamp 3, thereby separating the clamp 3 from the locating seat 1. Figure 7 The station pin 4 on the first station 16 is inserted into the positioning hole 5, thereby installing the fixture 3 on the first station 16. The CNC machine tool then performs cutting on the outer arc side of the middle section of the workpiece 14. Next, the fixture 3 is driven again, causing the station pin 4 on the first station 16 to disengage from the positioning hole 5, thereby removing the fixture 3 from the first station 16. Similarly, combined with... Figure 8 By inserting the station pin 4 on the second station 17 into the positioning hole 5, the fixture 3 is installed on the second station 17. The CNC machine tool then performs special-shaped cutting on both ends of the workpiece 14 to form the required shape of the stretching arm 15. This eliminates the need to remove the workpiece 14 from the fixture 3; the workpiece 14 is clamped in the fixture 3 only once. This helps prevent the workpiece 14 from being bumped or damaged, ensuring the accuracy of the finished product. Furthermore, the fixture 3 can be easily and quickly transferred, reducing disassembly and assembly time and thus improving processing efficiency.

[0058] In addition, looking back Figure 1 and Figure 3 Two positioning holes 5 are provided, spaced apart along the length of the base 31. Two positioning pins 2 are provided corresponding to the positioning holes 5, with each pin 2 making a transition fit with one of the two holes 5, thereby improving the connection stability between the fixture 3 and the positioning base 1 and ensuring the positioning accuracy of the workpiece 14 during processing. Figure 2 The number of station pins 4 on a single workstation corresponds to the number of positioning holes 5, ensuring that each workstation has two pins 4. Each of the two station pins 4 on a single workstation has a one-to-one transition fit with the two positioning holes 5. That is, both the first workstation 16 and the second workstation 17 have two station pins 4. The presence of two positioning pins 2, two station pins 4, and two positioning holes 5 reduces errors caused by inaccurate workpiece positioning, ensures the stability of workpiece 14 during workstation processing, effectively improves installation accuracy, and avoids errors caused by inaccurate workpiece 14 positioning.

[0059] The implementation principle of this embodiment is as follows: During positioning, the positioning pin 2 is inserted into the positioning hole 5 to connect the positioning seat 1 and the base 31, so as to determine the spatial position of the limiting part 8 and the base 31. By placing the inner arc side of the middle section of the workpiece 14 in the slot 6 and making the end face of the workpiece 14 completely abut against the limiting part 8, the position of the workpiece 14 is quickly determined. Then, by driving the bolt head to rotate, the bolt 33 extends into or out of the screw hole 10 along the width direction of the base 31, and drives the clamping plate 32 and the guide post 34 to move synchronously, so that the clamping plate 32 clamps the workpiece 14, thereby clamping and fixing the workpiece 14 in the contour groove 7, so as to achieve precise positioning of the workpiece 14. The contour groove 7 can prevent the workpiece 14 from shaking during cutting and shaping. At the same time, the part of the workpiece 14 to be processed can be fully exposed, which is convenient for the machine tool to perform cutting processing.

[0060] During cutting, the locating pin 2 is disengaged from the locating hole 5 by driving the fixture 3, thereby separating the fixture 3 from the locating seat 1. Then, the station pin 4 on the first station 16 is inserted into the locating hole 5, thereby installing the fixture 3 on the first station 16, and the CNC machine tool completes the cutting of the outer arc side of the middle section of the workpiece 14. Next, the fixture 3 is driven again, disengaging the station pin 4 on the first station 16 from the locating hole 5, thereby removing the fixture 3 from the first station 16. Similarly, by inserting the station pin 4 on the second station 17 into the locating hole 5, the fixture 3 is installed on the second station 17, and the CNC machine tool completes the cutting of the two ends of the workpiece 14 into a special shape to form the required shape of the stretching arm 15.

[0061] After cutting is completed, the station pin 4 on the second station 17 is disengaged from the positioning hole 5 by driving the clamp 3, thereby removing the clamp 3 from the second station 17. The clamp 32 is then loosened from the workpiece 14 by driving the bolt head to rotate, and the finished product can be taken out.

[0062] Therefore, there is no need to remove the workpiece 14 from the fixture 3. The workpiece 14 only needs to be clamped in the fixture 3 once, which helps to reduce the time spent on disassembly and assembly. According to the inspection, the time spent on loading and unloading a single workpiece 14 is reduced by 5-10 minutes. It can avoid the positioning deviation caused by repeated clamping. The transfer of the fixture 3 is convenient and fast. It also helps to prevent the workpiece 14 from being bumped or deformed, ensuring the quality of the finished product of the stretching arm 15 and improving the processing efficiency.

[0063] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A positioning device for the extension arm of a headset, characterized in that: It includes a positioning seat (1), a positioning pin (2) disposed on the positioning seat (1), a fixture (3) disposed on the positioning seat (1) for clamping the workpiece, and a station pin (4) disposed on the CNC machine tool station; the fixture (3) includes a base (31), a clamping plate (32) for clamping and fixing the workpiece, and a drive assembly for driving the clamping plate (32) to clamp or release the workpiece; The base (31) is provided with a positioning hole (5), and the positioning pin (2) and the station pin (4) are both transitionally fitted with the positioning hole (5); the base (31) is provided with a slot (6), and when the clamping plate (32) moves along the direction of clamping the workpiece, the clamping plate (32) gradually covers part of the opening of the slot (6) and forms a contour groove (7), the shape of the contour groove (7) matches the shape of the part of the workpiece that does not need to be cut; the positioning seat (1) is provided with a limiting part (8) for limiting the end face of the workpiece, and the limiting part (8) matches the shape of the end face of the workpiece.

2. The positioning device for the extension arm of a headset according to claim 1, characterized in that: The positioning seat (1) includes a base (11) and a positioning block (12) disposed on the base (11). The positioning pin (2) is disposed on the base (11). The positioning pin (2) and the positioning block (12) are both located on the same side of the base (11). The limiting part (8) is located on the positioning block (12).

3. The positioning device for the extension arm of a headset according to claim 1, characterized in that: The side of the base (31) away from the positioning hole (5) is an arc-shaped side (9), and the arc-shaped side (9) has the same curvature as the workpiece.

4. The positioning device for the extension arm of a headset according to claim 1, characterized in that: The limiting part (8) is an inclined surface.

5. The positioning device for the extension arm of a headphone according to claim 1, characterized in that: The drive assembly includes a bolt (33) passing through the clamping plate (32); the bolt (33) includes a lead screw and a bolt head located at one end of the lead screw, and a screw hole (10) is provided on the base (31). The lead screw and the screw hole (10) are threaded together. The lead screw passes through the clamping plate (32) and extends into the screw hole (10).

6. The positioning device for the extension arm of a headset according to claim 5, characterized in that: The drive assembly also includes a guide post (34) disposed on the clamping plate (32); one end of the guide post (34) is fixed to the clamping plate (32), and a guide groove (13) is provided on the base (31). The end of the guide post (34) away from the clamping plate (32) extends into the guide groove (13), and the guide post (34) and the guide groove (13) slide and cooperate.

7. The positioning device for the extension arm of a headphone according to claim 1, characterized in that: The base (31) has two slots (6) which are mirror images of each other. The number of clamping plates (32) corresponds to the number of slots (6), and the two clamping plates (32) clamp or release the workpieces on the two slots (6) respectively. The number of driving components corresponds to the number of clamping plates (32), and the two sets of driving components drive the two clamping plates (32) respectively.

8. The positioning device for the extension arm of a headset according to claim 1, characterized in that: The workstation pin (4) has the same structure as the positioning pin (2).

9. The positioning device for the extension arm of a headset according to claim 1, characterized in that: Two positioning holes (5) are provided, and the two positioning holes (5) are spaced apart; two positioning pins (2) are provided corresponding to the positioning holes (5), and the two positioning pins (2) are in one-to-one transition fit with the two positioning holes (5); two station pins (4) are provided on each station, and the two station pins (4) on each station are in one-to-one transition fit with the two positioning holes (5).

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