A positioning pin telescopic mechanism on a sheet metal fixture

Abstract

This utility model discloses a telescopic mechanism for a positioning pin on a sheet metal fixture, relating to the field of sheet metal fixture technology. It includes a fixed support frame, a sheet metal fixing fixture, and a sheet metal positioning structure. The fixed support frame is fixedly mounted on a workbench, the sheet metal fixing fixture is mounted on the fixed support frame, and the sheet metal positioning structure is mounted on one side of the sheet metal fixing fixture. The working end of the sheet metal positioning structure corresponds to the sheet metal fixed on the sheet metal fixing fixture. The sheet metal positioning structure consists of a mounting component, a moving component, a positioning component, and a positioning pin. The mounting frame is located on one side of the sheet metal fixing fixture, the moving component is slidably mounted on the mounting component, the positioning component is mounted on the moving component, and the positioning pin is mounted on the positioning component. This application effectively solves the problem of inaccurate positioning due to the fixed position of the fixed positioning pin, improving the positioning accuracy of the sheet metal in the fixture, and thus improving the processing accuracy.

Description

Technical Field

[0001] This utility model relates to the field of sheet metal fixture technology, and in particular to a positioning pin telescopic mechanism on a sheet metal fixture. Background Technology

[0002] During sheet metal processing, it is crucial to ensure the accuracy of its position to guarantee that the processed dimensions and shape meet design requirements. Locating pins engage with locating holes or surfaces on the sheet metal part to accurately determine its position within the fixture, preventing displacement or rotation during processing. This ensures processing precision and improves product quality.

[0003] In existing technologies, the locating pins on sheet metal fixtures are generally fixed structures, typically installed on the movable side of the fixture. These pins pre-position the sheet metal to ensure its correct location after fixing. However, the fixed position of these locating pins makes it difficult to adaptively adjust to dimensional tolerances and machining errors in the sheet metal. When there are dimensional deviations in the sheet metal, the locating pins may not accurately mate with the locating holes on the sheet metal, resulting in inaccurate positioning of the sheet metal within the fixture and affecting machining precision. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, the purpose of this utility model is to provide a positioning pin telescopic mechanism on a sheet metal fixture to solve the problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] In order to overcome the shortcomings of the existing technology, the purpose of this utility model is to provide a cutting device for processing building materials, which can solve the problem that when the cutting machine cuts pipes, the cutting machine rotates too fast, and when the cutting machine touches the surface of the pipe, the limiting of the pipe becomes unstable, causing the cutting point to shift and resulting in reduced processing accuracy.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows: It includes a fixed support frame, a sheet metal fixing clamp, and a sheet metal positioning structure. The fixed support frame is fixedly installed on a workbench, the sheet metal fixing clamp is disposed on the fixed support frame, and the sheet metal positioning structure is installed on one side of the sheet metal fixing clamp. The working end of the sheet metal positioning structure corresponds to the sheet metal fixed on the sheet metal fixing clamp. The sheet metal positioning structure consists of an mounting component, a moving component, a positioning component, and a positioning pin. The mounting component is disposed on one side of the sheet metal fixing clamp, the moving component is slidably installed on the mounting component, the positioning component is installed on the moving component, and the positioning pin is installed on the positioning component, with the positioning pin located on one side of the sheet metal fixing clamp.

[0008] Furthermore, the sheet metal fixing fixture includes a placement frame, a fixed block, a movable block, a limiting rod, and a threaded rod. The placement frame is mounted on a fixed support frame. The fixed block is mounted on one side of the placement frame and is connected to the placement frame by bolts. The movable block is placed in the placement frame and is horizontally aligned with the fixed block. There are two limiting rods, which are symmetrically slidably mounted on one side of the placement frame. One end of each limiting rod is connected to the movable block inside the placement frame. The movable block can move horizontally within the placement frame through the connection of the two limiting rods. The threaded rod is screwed onto one side of the placement frame and is located between the two limiting rods. The threaded rod is connected to the movable block on one side of the placement frame. A knob is provided on the other side of the threaded rod. By rotating the knob, the threaded rod can move on the placement frame and drive the movable block to move within the placement frame. When the movable block moves within the placement frame, it can cooperate with the fixed block to fix the sheet metal within the placement frame.

[0009] Furthermore, the mounting component includes a mounting frame and a mounting rod. The mounting frame is U-shaped, with its two sides respectively located at both ends of the side wall of the placement frame. There is a certain gap between the mounting frame and the middle position of the placement frame. The mounting rod is mounted on the mounting frame, which facilitates the installation of the movable component and enables the movable component to move stably on the mounting frame.

[0010] Furthermore, the movable component includes a movable frame, a pushing connecting rod, and fixing bolts. The movable frame is slidably installed in the mounting frame, with its two sides positioned on the inner and outer sides of the mounting frame, respectively. One end of the movable frame positioned on the outer side of the mounting frame is connected to the mounting rod. One end of the pushing connecting rod is positioned inside the mounting frame and connected to the movable frame, while the other end of the pushing connecting rod passes through the mounting frame and is positioned on the outer side of the mounting frame. The pushing connecting rod is threaded, and two fixing bolts are provided. Both fixing bolts are installed on the pushing connecting rod, and both fixing bolts correspond to the threads on the pushing connecting rod. The two fixing bolts are positioned on the inner and outer sides of the mounting frame, respectively, and the pushing connecting rod can be fixed to the mounting frame and cannot be moved by the two fixing bolts.

[0011] Furthermore, the top surface of the mounting bracket is provided with scale values ​​that are easy for operators to observe, and the top of the movable bracket is provided with a scale pointer that corresponds to the scale values. When the movable bracket moves, it will drive the scale pointer to move synchronously to correspond to different scale values. Through the scale values, the operator can clearly observe the distance moved by the movable component.

[0012] Furthermore, the positioning component includes a drive frame, an electric push rod, a push rod, a movable connecting rod, and a movable connecting plate. The drive frame is mounted on one side of the movable frame and is positioned on the outside of the mounting frame. The electric push rod is mounted on the drive frame, with one end of the push rod connected to the working end of the electric push rod and the other end of the push rod passing through the movable frame and positioned inside the mounting frame. Two movable connecting rods are provided, symmetrically arranged on the other side of the movable frame. The movable connecting plate is slidably mounted on the two movable connecting rods and is connected to the other side of the push rod. The movable connecting plate can be installed with a positioning pin.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] In this application, a fixed support frame is pre-securely installed on the workbench to provide stable support for subsequent components. The sheet metal fixing fixture is in a ready-to-work state, with all components of the sheet metal positioning structure installed and awaiting operation instructions. For sheet metal processing requirements of different sizes, the operator can manually adjust the position of the moving parts on the mounting parts. By manually observing and measuring the dimensions of the sheet metal parts, and based on experience or simple measuring tools, the adjustment distance and direction of the moving parts are determined, ensuring that the positioning pins correspond to the sheet metal positioning holes at different positions. The sheet metal is placed on the sheet metal fixing fixture, bringing it into contact with the sheet metal positioning structure. At this point, the positioning pins function, engaging with the positioning holes on the sheet metal to initially limit its position, determining the approximate position of the sheet metal on the fixing fixture. After the positioning pins have completed their limiting, the sheet metal fixing fixture is operated to clamp and fix the positioned sheet metal. Clamping force is applied by the fixture to ensure that the sheet metal does not shift or wobble during processing. This application effectively solves the problem of inaccurate positioning due to the fixed position of fixed positioning pins, improving the positioning accuracy of the sheet metal in the fixture, and thus enhancing processing accuracy. Attached Figure Description

[0015] Figure 1 This is a three-dimensional schematic diagram of the present invention from a first angle;

[0016] Figure 2 This is a three-dimensional schematic diagram of the present invention from a second angle;

[0017] Figure 3 This is a three-dimensional schematic diagram of the sheet metal positioning structure in this utility model;

[0018] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0019] Figure 5 This is a schematic diagram of the assembly of the mounting bracket moving part and the mounting part in this utility model.

[0020] In the diagram: 1. Fixed support frame; 2. Sheet metal fixing clamp; 21. Placement frame; 22. Fixed block; 23. Movable block; 24. Limiting rod; 25. Threaded rod; 26. Knob; 3. Sheet metal positioning structure; 31. Mounting component; 311. Mounting frame; 312. Mounting rod; 313. Scale value; 32. Moving component; 321. Moving frame; 322. Push connecting rod; 323. Fixing bolt; 324. Scale pointer; 33. Positioning component; 33. Drive frame; 331. Electric push rod; 332. Push rod; 333. Moving connecting rod; 334. Moving connecting plate; 335. Positioning pin; 4. Detailed Implementation

[0021] Below, in conjunction with the appendix Figures 1 to 5 The present invention will be further described in detail below: The present invention provides a positioning pin telescopic mechanism on a sheet metal fixture, including a fixed support frame 1, a sheet metal fixing fixture 2 and a sheet metal positioning structure 3. The fixed support frame 1 is fixedly installed on a workbench, the sheet metal fixing fixture 2 is disposed on the fixed support frame 1, and the sheet metal positioning structure 3 is installed on one side of the sheet metal fixing fixture 2. The working end of the sheet metal positioning structure 3 corresponds to the sheet metal fixed on the sheet metal fixing fixture 2.

[0022] The sheet metal positioning structure 3 consists of a mounting component 31, a moving component 32, a positioning component 33, and a positioning pin 4. The mounting component 31 is disposed on one side of the sheet metal fixing fixture 2. The moving component 32 is slidably mounted on the mounting component 31. The positioning component 33 is mounted on the moving component 32. The positioning pin 4 is mounted on the positioning component 33 and is located on one side of the sheet metal fixing fixture 2.

[0023] In this application, the fixed support frame 1 is pre-securely installed on the workbench to provide stable support for subsequent components. The sheet metal fixing fixture 2 is in a ready-to-work state, and all components of the sheet metal positioning structure 3 are installed in place, awaiting operation instructions. For sheet metal processing requirements of different sizes, the operator can manually adjust the position of the moving part 32 on the mounting part 31. By manually observing and measuring the dimensions of the sheet metal parts, and based on experience or simple measuring tools, the adjustment distance and direction of the moving part 32 are determined so that the positioning pin 4 can correspond to the sheet metal positioning holes at different positions. The sheet metal is placed on the sheet metal fixing fixture 2, so that the sheet metal contacts the sheet metal positioning structure 3. At this time, the positioning pin 4 plays its role, cooperating with the positioning holes on the sheet metal to initially limit the sheet metal, determining the approximate position of the sheet metal on the fixing fixture. After the positioning pin 4 has completed its limiting, the sheet metal fixing fixture 2 is operated to clamp and fix the positioned sheet metal. The clamping force applied by the fixture ensures that the sheet metal will not shift or shake during processing.

[0024] Compared with the sheet metal fixture positioning pin 4 in the traditional technology, the sheet metal fixture positioning pin 4 in this application has several advantages. First, it improves the positioning accuracy. Through the adjustable moving part 32, the positioning pin 4 can be adapted to the actual size of the sheet metal part and the position of the positioning hole, which effectively solves the problem that the fixed positioning pin 4 is difficult to position accurately due to its fixed position. This improves the positioning accuracy of the sheet metal in the fixture, thereby improving the processing accuracy and reducing the scrap rate.

[0025] Secondly, the applicability of the fixture is enhanced. The mechanism can adapt to the processing of sheet metal parts of various sizes without the need to design or replace fixtures for different sizes of sheet metal, which reduces fixture costs and management difficulty, and improves the versatility and efficiency of the fixture.

[0026] Furthermore, the sheet metal fixing fixture 2 in this application is simple and convenient to operate, and the manual adjustment method of the moving part 32 is simple and intuitive. Operators can master the operation method without complicated training. It is easy to implement in actual production and will not cause too many complicated operations to the production process, which is conducive to improving production efficiency.

[0027] Finally, it provides excellent stability in processing. Precise positioning and reliable fixing ensure the sheet metal remains stable during processing, effectively resisting external forces (such as cutting forces and impact forces) and ensuring smooth processing, thereby improving product quality stability.

[0028] Preferably, the sheet metal fixing fixture 2 includes a placement frame 21, a fixing block 22, a movable block 23, a limiting rod 24, and a threaded rod 25. The placement frame 21 is mounted on the fixed support frame 1. The fixing block 22 is mounted on one side inside the placement frame 21 and is connected to the placement frame 21 by bolts. The movable block 23 is placed inside the placement frame 21 and is horizontally corresponding to the fixing block 22. Two limiting rods 24 are provided, and the two limiting rods 24 are symmetrically and slidably mounted on one side of the placement frame 21. The ends of the two limiting rods 24 inside the placement frame 21 are connected to the movable block. The movable block 23 is connected to the placement frame 21 by two limiting rods 24. The threaded rod 25 is screwed onto one side of the placement frame 21 and is located between the two limiting rods 24. The threaded rod 25 is connected to the movable block 23 on one side of the placement frame 21. A knob 26 is provided on the other side of the threaded rod 25. By rotating the knob 26, the threaded rod 25 can be moved on the placement frame 21 and the movable block 23 can be moved within the placement frame 21. When the movable block 23 moves within the placement frame 21, it can cooperate with the fixing block 22 to fix the sheet metal within the placement frame 21.

[0029] In this application, the sheet metal fixing fixture 2 operates as follows: A placement frame 21 is mounted on a fixed support frame 1, serving as the basic component of the sheet metal fixing fixture 2 and providing a support platform for the entire fixing process. A fixing block 22 is bolted to one side of the placement frame 21, defining a fixed support point and clamping reference surface. Two limit rods 24 are symmetrically slidably mounted on one side of the placement frame 21, with one end connected to a movable block 23, providing guidance for the horizontal movement of the movable block 23 within the placement frame 21. The limit rods 24 ensure that the movable block 23 can only move linearly in the horizontal direction, preventing deviation or wobbling and ensuring the stability and accuracy of the movement. A threaded rod 25 is screwed onto one side of the placement frame 21 and located between the two limit rods 24, with one end connected to the movable block 23 and the other end equipped with a knob 26. When the knob 26 is rotated, according to the threaded transmission principle, the threaded rod 25 moves linearly on the placement frame 21, causing the movable block 23 to move synchronously. The movable block 23 moves toward the fixed block 22 and works together with the fixed block 22 to clamp and fix the sheet metal placed between the two; rotating the knob 26 in the opposite direction can move the movable block 23 away from the fixed block 22, loosening the sheet metal for removal.

[0030] In this application, firstly, guided by the limiting rod 24 and driven by the threaded rod 25, the movable block 23 can smoothly and accurately approach or move away from the fixed block 22, achieving reliable clamping and loosening of the sheet metal. This method provides uniform and stable clamping force, effectively preventing the sheet metal from loosening or shifting due to external forces during processing, ensuring processing stability and accuracy. Furthermore, the operator can flexibly adjust the position of the movable block 23 by rotating the knob 26 according to the thickness and size of the sheet metal part, thereby adapting to sheet metal parts of different specifications and improving the versatility of the fixture. Whether the sheet metal is thin or thick, a suitable clamping degree can be achieved through simple operation.

[0031] Secondly, the knob 26 makes operation simple and convenient. Operators do not need to use complicated tools. They can complete the clamping and loosening process of sheet metal by manually turning the knob 26, which reduces clamping time and improves work efficiency.

[0032] Finally, the fixing block 22 is bolted to the placement frame 21 for easy disassembly and replacement. When the fixing block 22 wears out or needs to be adapted to different types of sheet metal, it can be quickly adjusted. At the same time, the entire fixture structure is relatively simple, and the installation, repair and maintenance of each component are relatively easy, reducing the cost of use and the difficulty of maintenance.

[0033] Preferably, the mounting component 31 includes a mounting frame 311 and a mounting rod 312. The mounting frame 311 is U-shaped, with its two sides respectively located at both ends of the side wall of the placement frame 21. There is a certain gap between the mounting frame 311 and the middle position of the placement frame 21. The mounting rod 312 is mounted on the mounting frame 311. The mounting rod 312 on the mounting frame 311 facilitates the installation of the movable component 32, and the movable component 32 can move stably on the mounting frame 311 through the mounting rod 312.

[0034] In this application, the mounting bracket 311 is U-shaped, with its two sides connected to the two ends of the side wall of the placement bracket 21, providing a stable support frame for the entire mounting component 31. The U-shaped design creates a gap between the mounting bracket 311 and the placement bracket 21, avoiding interference with other components within the placement bracket 21 and providing space for the installation and movement of components such as the movable component 32, thus rationally planning the layout of the sheet metal positioning structure 3. The mounting rod 312 is mounted on the mounting bracket 311, serving as the mounting base for the movable component 32. After the movable component 32 is mounted on the mounting rod 312, the mounting rod 312 provides it with a moving track. When the movable component 32 slides on the mounting rod 312, the mounting rod 312 acts as a constraint and guide, ensuring that the movable component 32 can only move linearly along the axial direction of the mounting rod 312, restricting its freedom in other directions, thereby ensuring the stability and straightness of the movement of the movable component 32, and allowing the positioning pin 4 to accurately reach the position that mates with the sheet metal positioning hole.

[0035] Preferably, the movable component 32 includes a movable frame 321, a pushing connecting rod 322, and fixing bolts 323. The movable frame 321 is slidably installed in the mounting frame 311, and the two sides of the movable frame 321 are respectively placed on the inner and outer sides of the mounting frame 311. One end of the movable frame 321 placed on the outer side of the mounting frame 311 is connected to the mounting rod 312. One end of the pushing connecting rod 322 is placed inside the mounting frame 311 and connected to the movable frame 321. The other end of the pushing connecting rod 322 passes through the mounting frame 311 and is placed on the outer side of the mounting frame 311. The pushing connecting rod 322 is threaded. There are two fixing bolts 323, both of which are installed on the pushing connecting rod 322, and both of the fixing bolts 323 correspond to the threads on the pushing connecting rod 322. The two fixing bolts 323 are respectively placed on the inner and outer sides of the mounting frame 311 on the pushing connecting rod 322. The pushing connecting rod 322 can be fixed to the mounting frame 311 by the two fixing bolts 323 and cannot move.

[0036] In this application, the movable frame 321 can slide smoothly in a straight line within the mounting frame 311 with the guidance of the mounting rod 312. The movable frame 321 provides a mounting base for the push connecting rod 322, allowing the push connecting rod 322 to move with the movable frame 321. When the position of the movable frame 321 needs to be adjusted, the two fixing bolts 323 are loosened, and the operator can push or pull the push connecting rod 322 to drive the movable frame 321 to slide within the mounting frame 311, thereby adjusting the position of the positioning component 33 and the positioning pin 4 to match the positioning hole of the sheet metal part. After adjustment, the two fixing bolts 323 are tightened, and the push connecting rod 322 is firmly fixed to the mounting frame 311 by the engagement of the bolts and the threads of the bolts, preventing the movable frame 321 from shifting during processing and ensuring the stability of the positioning pin 4.

[0037] In this application, the position of the movable frame 321 can be easily adjusted by loosening and tightening the fixing bolts 323. This operation method allows the positioning pin 4 to be positioned flexibly and accurately according to the actual size of the sheet metal part and the position of the positioning hole, effectively solving the problem that the traditional fixed positioning pin 4 is difficult to adapt to sheet metal size deviations, and improving positioning accuracy.

[0038] Preferably, the top surface of the mounting bracket 311 is provided with a scale value 313 that is easy for the operator to observe, and the top of the movable bracket 321 is provided with a scale pointer 324 corresponding to the scale value 313. When the movable bracket 321 moves, it will drive the scale pointer 324 to move synchronously to correspond to different scale values ​​313. The scale value 313 makes it easy for the operator to clearly observe the distance moved by the movable component 32.

[0039] In this application, when adjusting the position of the movable frame 321, the operator can precisely control the movement distance of the movable frame 321 based on the correspondence between the scale value 313 and the scale pointer 324. For example, when it is necessary to move the positioning pin 4 to a specific position to mate with the sheet metal positioning hole, the required movement distance can be judged based on pre-measurement or experience. By observing the position of the scale pointer 324 on the scale value 313, the movable frame 321 can be accurately adjusted to achieve precise positioning of the positioning pin 4.

[0040] By setting the scale value 313 and scale pointer 324, operators are provided with an intuitive and quantifiable reference for the movement distance, changing the previous method of adjusting the position based on experience or rough estimation. The precision down to specific scale values ​​allows for more accurate adjustment of the moving frame 321, ensuring that the positioning pin 4 can more accurately engage with the sheet metal positioning hole, improving sheet metal positioning accuracy and ultimately enhancing machining precision. The scale value 313 and scale pointer 324 facilitate quick and accurate adjustment of the moving frame 321 position by operators according to the scale indications, eliminating the need for repeated attempts and measurements. This significantly reduces the time required to adjust the positioning pin 4 position, improving the efficiency of sheet metal clamping. Especially in batch production, it effectively reduces the clamping time for individual workpieces, improving overall production efficiency. Furthermore, the scale value 313 and scale pointer 324 provide operators with a unified operating standard. Different operators can operate according to the same scale indications when adjusting the moving frame 321, facilitating the establishment of standardized operating procedures, ensuring consistency and standardization of operations, and also helping new employees quickly master the key operating points.

[0041] Preferably, the positioning component 33 includes a drive frame 331, an electric push rod 332, a push rod 333, a movable connecting rod 334, and a movable connecting plate 335. The drive frame 331 is mounted on one side of the movable frame 321, and the drive frame 331 is positioned on the outside of the mounting frame 311 on the movable component 32. The electric push rod 332 is mounted on the drive frame 331. One end of the push rod 333 is connected to the working end of the electric push rod 332, and the other end of the push rod 333 passes through the movable frame 321 and is positioned inside the mounting frame 311. Two movable connecting rods 334 are provided, and the two movable connecting rods 334 are symmetrically arranged on the other side of the movable frame 321. The movable connecting plate 335 is slidably mounted on the two movable connecting rods 334, and the movable connecting plate 335 is connected to the other side of the push rod 333. The movable connecting plate 335 can be used to install the positioning pin 4.

[0042] In this application, two movable connecting rods 334 are symmetrically arranged on the other side of the movable frame 321, and a movable connecting plate 335 is slidably mounted on it and connected to the push rod 333. As the push rod 333 is driven to move by the electric push rod 332, the movable connecting plate 335, under the precise guidance of the movable connecting rods 334, can only move in a straight line along the axis of the connecting rods. This design ensures that the movement direction of the movable connecting plate 335 is precise and controllable, avoiding deviation or wobbling. At the same time, the linkage effect allows the installation position of the positioning pin 4 to be adjusted synchronously with the movement of the electric push rod 332, ensuring positioning accuracy.

[0043] For those skilled in the art, various other corresponding changes and modifications can be made based on the technical solutions and concepts described above, and all such changes and modifications should fall within the protection scope of the claims of this utility model.

Claims

1. A retractable mechanism for a positioning pin on a sheet metal fixture, characterized by, It includes a fixed support frame (1), a sheet metal fixing fixture (2) and a sheet metal positioning structure (3). The fixed support frame (1) is fixedly installed on the workbench. The sheet metal fixing fixture (2) is set on the fixed support frame (1). The sheet metal positioning structure (3) is installed on one side of the sheet metal fixing fixture (2). The working end of the sheet metal positioning structure (3) corresponds to the sheet metal fixed on the sheet metal fixing fixture (2). The sheet metal positioning structure (3) consists of an mounting part (31), a moving part (32), a positioning part (33), and a positioning pin (4). The mounting part (31) is located on one side of the sheet metal fixing fixture (2). The moving part (32) is slidably mounted on the mounting part (31). The positioning part (33) is mounted on the moving part (32). The positioning pin (4) is mounted on the positioning part (33) and is located on one side of the sheet metal fixing fixture (2) on the positioning part (33).

2. The positioning pin telescopic mechanism on a sheet metal fixture according to claim 1, characterized in that, The sheet metal fixing fixture (2) includes a placement frame (21), a fixing block (22), a movable block (23), a limiting rod (24), and a threaded rod (25). The placement frame (21) is mounted on a fixed support frame (1). The fixing block (22) is mounted on one side inside the placement frame (21). The fixing block (22) is connected to the placement frame (21) by bolts. The movable block (23) is placed inside the placement frame (21) and is horizontally corresponding to the fixing block (22). There are two limiting rods (24). The two limiting rods (24) are symmetrically slidably mounted on one side of the placement frame (21), and one end of the two limiting rods (24) inside the placement frame (21) is connected to the movable block (23). The movable block (23) is connected to the placement frame (21) by two limiting rods (24). The threaded rod (25) is screwed to one side of the placement frame (21) and is located between the two limiting rods (24). The threaded rod (25) is connected to the movable block (23) on one side of the placement frame (21). A knob (26) is provided on the other side of the threaded rod (25). By rotating the knob (26), the threaded rod (25) can be moved on the placement frame (21) and the movable block (23) can be moved in the placement frame (21). When the movable block (23) moves in the placement frame (21), it can cooperate with the fixing block (22) to fix the sheet metal in the placement frame (21).

3. The positioning pin telescopic mechanism on a sheet metal fixture according to claim 2, characterized in that, The mounting component (31) includes a mounting frame (311) and a mounting rod (312). The mounting frame (311) is U-shaped, with its two sides respectively located on the two ends of the side wall of the placement frame (21). There is a certain gap between the mounting frame (311) and the middle position of the placement frame (21). The mounting rod (312) is located on the mounting frame (311). The mounting rod (312) on the mounting frame (311) facilitates the installation of the movable component (32), and the movable component (32) can move stably on the mounting frame (311) through the mounting rod (312).

4. The positioning pin telescopic mechanism on a sheet metal fixture according to claim 3, characterized in that, The movable component (32) includes a movable frame (321), a push connecting rod (322), and a fixing bolt (323). The movable frame (321) is slidably installed in the mounting frame (311), and the two sides of the movable frame (321) are respectively placed on the inner and outer sides of the mounting frame (311). One end of the movable frame (321) placed on the outer side of the mounting frame (311) is connected to the mounting rod (312). One end of the push connecting rod (322) is placed inside the mounting frame (311) and connected to the movable frame (321). The other end of the push connecting rod (322) passes through the mounting frame (311). The push connecting rod (322) is provided with threads, and there are two fixing bolts (323). Both fixing bolts (323) are installed on the push connecting rod (322), and both fixing bolts (323) correspond to the threads on the push connecting rod (322). The two fixing bolts (323) are respectively placed on the inner and outer sides of the mounting frame (311) on the push connecting rod (322). The push connecting rod (322) can be fixed on the mounting frame (311) and cannot be moved by the two fixing bolts (323).

5. The positioning pin telescopic mechanism on a sheet metal fixture according to claim 4, characterized in that, The mounting bracket (311) has a scale value (313) on its top surface that is easy for the operator to observe. The top of the movable bracket (321) has a scale pointer (324) that corresponds to the scale value (313). When the movable bracket (321) moves, it will drive the scale pointer (324) to move synchronously to correspond to different scale values ​​(313). The scale value (313) makes it easy for the operator to clearly observe the distance moved by the movable part (32).

6. The positioning pin telescopic mechanism on a sheet metal fixture according to claim 4, characterized in that, The positioning component (33) includes a drive frame (331), an electric push rod (332), a push rod (333), a movable connecting rod (334), and a movable connecting plate (335). The drive frame (331) is mounted on one side of the movable component (32), and the drive frame (331) is positioned on the outside of the mounting frame (311) on the movable frame (321). The electric push rod (332) is mounted on the drive frame (331), and one end of the push rod (333) is connected to the working end of the electric push rod (332). The push rod (333) is connected, with the other end passing through the movable frame (321) and placed inside the mounting frame (311). There are two movable connecting rods (334), which are symmetrically arranged on the other side of the movable frame (321). The movable connecting plate (335) is slidably installed on the two movable connecting rods (334) and is connected to the other side of the push rod (333). The movable connecting plate (335) can be installed by the positioning pin (4).

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