A front positioning device for a bending machine

Abstract

The application relates to the positioning technology field of a bending machine, and particularly discloses a front positioning device of a bending machine, which is installed at one side of a bending machine body and comprises a mounting frame, a spacing adjusting mechanism arranged on the mounting frame and used for adjusting the distance between the mounting frame and the bending machine body, a sliding seat arranged on the top of the mounting frame, a positioning plate arranged on the sliding seat and used for quickly positioning the position of a workpiece, and an installation and dismounting mechanism arranged on the sliding seat and used for quickly installing and dismounting the positioning plate and the sliding seat. The spacing adjusting mechanism can be used for adjusting the position of the mounting frame, the mounting frame can be adjusted to a required position, the position of the positioning plate can be accurately located at a required placement position, an operator only needs to quickly abut the workpiece against the positioning plate when placing the workpiece, accurate positioning can be realized, and the installation and dismounting of the positioning plate are more convenient through the installation and dismounting mechanism.

Description

Technical Field

[0001] This application relates to the field of bending machine positioning technology, and in particular to a front positioning device for a bending machine. Background Technology

[0002] A bending machine is an important piece of equipment in the sheet metal industry for bending and forming workpieces. Its function is to press steel plates into parts of various shapes according to process requirements. The main components consist of a frame made up of left and right columns, a worktable, and a crossbeam. Left and right hydraulic cylinders are fixed to the columns. The slider is connected to the piston of the cylinder and moves up and down along a guide rail fixed to the column. The upper die is installed at the lower end of the slider, and the lower die is fixed to the worktable. The hydraulic system provides power, and the electrical system issues commands. Under the action of the hydraulic cylinders, the slider drives the upper die downward to close with the lower die, thus bending the sheet metal.

[0003] Before bending the workpiece, the operator places the workpiece on the lower die, and the electrical system controls the hydraulic system to work, causing the slider to drive the upper die to press down, thereby extruding and deforming the workpiece, thus achieving the bending and forming of the workpiece.

[0004] However, the above-mentioned technology has high precision requirements for the bending position of the workpiece. Therefore, the workpiece must be placed in a sufficiently accurate position. However, it is difficult to ensure that the workpiece is in a precise processing position by manually placing it, which will lead to a large deviation between the bending position and the standard. Therefore, this needs to be improved. Summary of the Invention

[0005] To improve the accuracy of workpiece placement, this application provides a front positioning device for a bending machine.

[0006] This application provides a front positioning device for a bending machine, which adopts the following technical solution:

[0007] A front positioning device for a bending machine is installed on one side of the worktable of the bending machine body. It includes a mounting frame and a spacing adjustment mechanism disposed on the mounting frame for adjusting the distance between the mounting frame and the bending machine body. It also includes a slide seat disposed on the top of the mounting frame, a positioning plate disposed on the slide seat for positioning the workpiece, and a disassembly mechanism disposed on the slide seat for detachably connecting the positioning plate and the slide seat.

[0008] By adopting the above technical solution, when the positioning plate needs to be quickly positioned, the position of the mounting bracket is first adjusted through the spacing adjustment mechanism to adjust the mounting bracket to the required position. At this time, the positioning plate can be accurately positioned where it needs to be placed. Then, when the operator places the workpiece, he only needs to push the workpiece until it abuts against the positioning plate to achieve accurate positioning of the positioning plate.

[0009] Because the bending machine exerts significant downward pressure on the worktable during operation, the worktable needs to be maintained and inspected regularly. The installation and removal mechanism enables the slide to be quickly installed and removed, making the installation and removal of the positioning plate more convenient. This allows the worktable to be easily inspected, reducing the complexity of the installation and removal process and enabling operators to complete the inspection more efficiently, thus improving operational efficiency.

[0010] Optionally, the installation and removal mechanism includes multiple clamping seats and a clamping assembly disposed in each clamping seat and used to clamp the clamping seat on the slide. A rotating rod is rotatably mounted on the top of each clamping seat, and the end of each rotating rod away from the clamping seat is connected to the positioning plate.

[0011] The clamping seat is also provided with a pushing component for driving the clamping assembly to clamp and fix it. A linkage component is provided between the rotating rod and the pushing component. When the rotating rod is rotated, the linkage component drives the clamping assembly through the pushing component to clamp the clamping seat on the slide.

[0012] By adopting the above technical solution, when it is necessary to clamp and fix the clamping seat on the slide, the rotating rod is rotated. The rotating rod will move through the linkage component, causing the linkage component to drive the pushing component to move. The pushing component pushes the clamping component to clamp and fix the clamping seat on the slide, thereby realizing the rapid installation of the positioning plate.

[0013] Optionally, the bottom of the clamping seat is provided with a sliding groove that is adapted to slide the slide block. The clamping assembly is provided in two sets. Each set of the clamping assembly includes two clamping plates slidably disposed in the clamping seat and a wedge block connected to the two clamping plates. The two clamping plates are installed opposite each other in the inner wall of the clamping seat, and the pushing assembly can drive the wedge block to slide, so that the two clamping plates extend into the sliding groove.

[0014] By adopting the above technical solution, when it is necessary to fix the clamping seat on the slide, firstly, the sliding groove on the clamping seat is engaged with the corresponding position on the slide, and then the rotating rod is rotated. The rotating rod drives the pushing component to move through the linkage component. The pushing component drives the wedge block to move, so that the two clamping plates slide towards each other, thereby realizing the quick clamping and fixing of the clamping seat.

[0015] Optionally, the clamping seat is provided with a first reset member for driving the clamping plate to reset.

[0016] By adopting the above technical solution, when the clamping plate is not pushed by the pushing component, the first reset member can retract the clamping plate into the clamping seat, so that the sliding groove on the clamping seat will not be obstructed when it engages with the sliding block.

[0017] Optionally, the pushing assembly is provided in two sets, with the two sets of pushing assemblies located on both sides of the slide groove. Each set of pushing assemblies includes a driven gear rotatably mounted in the clamping seat, a driven rack slidably mounted in the clamping seat, and a pushing block disposed at the end of the driven rack. The driven gear and the driven rack mesh. When the rotating rod is rotated, the linkage assembly can drive the driven gear to rotate, so that the pushing block can drive the wedge block to slide towards the slide groove.

[0018] By adopting the above technical solution, when the rotating rod is rotated, the rotating rod will drive the linkage component to move, causing the linkage component to drive the driven gear to rotate, and the driven gear to drive the driven rack to move, thereby causing the push block at the end of the driven rack to move closer to the wedge block. Finally, the push block will drive the wedge block to move, so that the two clamping plates move closer to each other and extend into the slide groove, thereby clamping and fixing the clamping seat on the slide, achieving quick installation.

[0019] Optionally, the linkage component includes a sliding plate slidably disposed in the clamping seat, a first active rack fixed to one side of the sliding plate, and two second active racks fixed to the other side of the sliding plate and located near the end. The rotating end of the rotating rod is arc-shaped and has an active gear fixed thereon. The active gear meshes with the first active rack, and the two second active racks mesh with the corresponding driven gears respectively.

[0020] By adopting the above technical solution, when it is necessary to clamp and fix the clamping seat, firstly, the sliding groove on the clamping seat is engaged with the corresponding sliding block, and then the rotating rod is rotated so that the orientation of the rotating rod changes from vertical to horizontal. During the rotation, the driving gear drives the first driving rack to move, causing the sliding plate to move. The movement of the sliding plate drives the two second driving racks to move, causing the two second driving racks to drive the corresponding driven gears to rotate. The driven gears drive the driven racks to move, thereby causing the push block at the end of the driven rack to move, thus realizing the movement of the clamping plate.

[0021] Optionally, the clamping seat is provided with a second reset member, which can drive the sliding plate to move from the end away from the driving gear to the direction closer to the driving gear.

[0022] By adopting the above technical solution, the second reset member can drive the sliding plate to move in the direction of the driving gear, so that the rotating rod tends to rotate in a vertical state. Before the clamping seat is clamped onto the slide, the second reset member keeps the sliding plate in a position close to the driving gear, keeps the push block at the end of the driven rack in a position relatively close to the sliding plate, and keeps the clamping plate in a state of being retracted into the clamping seat, so that the slide groove can be easily attached to the slide.

[0023] Optionally, the clamping base is further provided with a locking structure for locking the movement of the sliding plate.

[0024] By adopting the above technical solution, the locking structure can lock the sliding plate, making the clamping effect of the clamping plate more stable.

[0025] Optionally, the locking structure includes a rod that is slidably inserted into the clamping seat, and a slot is provided on the sliding plate. When the rod is aligned with the slot, the rod is inserted into the slot.

[0026] By adopting the above technical solution, when the rotating rod is rotated to a horizontal position, the slot on the sliding plate slides to be directly opposite the end of the insertion rod. At this time, the insertion rod falls into the slot under the action of gravity, thereby achieving the limiting and locking of the sliding plate.

[0027] Optionally, the locking structure further includes a third reset member for moving the insertion rod toward the surface of the sliding plate.

[0028] By adopting the above technical solution, the third reset component can move the insertion rod closer to the sliding plate, overcoming the defect that the insertion rod is difficult to insert into the slot due to the friction between it and the inner wall of the clamping seat, making the insertion process of the insertion rod and the slot more stable.

[0029] In summary, this application includes at least one of the following beneficial technical effects:

[0030] 1. The spacing adjustment mechanism can adjust the position of the mounting bracket to the required position. At this time, the operator only needs to push the workpiece to abut against the positioning plate to achieve accurate positioning of the positioning plate.

[0031] 2. Because the bending machine exerts a large downward pressure on the worktable during operation, the worktable needs to be maintained and inspected regularly. The installation and removal mechanism enables the slide to be quickly installed and removed, making the installation and removal of the positioning plate more convenient. At this time, the worktable can be easily inspected, reducing the complicated operation in the process of installing and removing the positioning plate, enabling operators to complete the inspection more efficiently and improving the efficiency of operation.

[0032] 3. When it is necessary to clamp and fix the clamping seat on the slide, rotate the rotating rod. The rotating rod will move through the linkage component, causing the linkage component to drive the pushing component to move. The pushing component pushes the clamping component to clamp and fix the clamping seat on the slide, thereby realizing the quick installation of the positioning plate.

[0033] 4. When it is necessary to fix the clamping seat on the slide, the linkage component drives the pushing component to move, and the pushing component drives the wedge block to move, so that the two clamping plates slide towards each other, thereby realizing the quick clamping and fixing of the clamping seat. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the overall structure of a front positioning device for a bending machine and the body of the bending machine in an embodiment of this application.

[0035] Figure 2 This is a schematic diagram of the overall structure of a front positioning device for a bending machine according to an embodiment of this application.

[0036] Figure 3 yes Figure 2 A schematic diagram of the overall structure of the rapid installation and dismantling mechanism.

[0037] Figure 4 yes Figure 3 A partial sectional view of the middle clamping seat from a first-person perspective.

[0038] Figure 5 yes Figure 3 A partial cross-sectional view of the middle clamping seat from a second perspective.

[0039] Reference numerals in the attached drawings: 1. Bending machine body; 11. Upper die; 12. Lower die; 2. Mounting bracket; 21. Slide block; 22. Positioning plate; 3. Installation and removal mechanism; 31. Clamping seat; 311. Slide groove; 312. Rotating rod; 313. Drive gear; 32. Clamping assembly; 321. Clamping plate; 322. Wedge block; 33. Pushing assembly; 331. Driven gear; 332. Driven rack; 333. Pushing block; 34. Linkage assembly; 341. Sliding plate; 342. First drive rack; 343. Second drive rack; 4. Spacing adjustment mechanism; 41. Guide seat; 42. Position adjustment rack; 5. Base; 6. First reset component; 7. Locking structure; 71. Insert rod; 72. Third reset component; 8. Slot. Detailed Implementation

[0040] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail below.

[0041] This application discloses a front positioning device for a bending machine.

[0042] Reference Figure 1 The bending machine body 1 mainly includes left and right columns, a worktable, and a crossbeam. The left and right oil cylinders are fixed on the columns. The slider is connected to the piston of the oil cylinder and moves up and down along the guide rail fixed on the column. The lower die 12 is fixed on the worktable, and the upper die 11 is installed at the lower end of the slider.

[0043] The lower end of the upper die 11 is set with a pointed tip, and the upper surface of the lower die 12 is provided with a pressure groove that matches the pointed tip of the upper die 11. The hydraulic system provides power and the electrical system gives instructions. Under the action of the oil cylinder, the slider drives the upper die 11 to move downward, so that the pointed tip on the upper die 11 presses the part of the workpiece placed on the lower die 12 into the pressure groove, thereby realizing the bending process of the workpiece.

[0044] In this process, the traditional method is to manually feed the workpiece, that is, the operator carefully places the workpiece in a suitable position on the lower die 12, waits for the bending machine body to complete the bending of the workpiece, and then removes the processed workpiece from the bending machine body, and then takes the next workpiece, repeating this operation to realize the processing operation of multiple workpieces.

[0045] This feeding method places certain demands on the operator's skills. It is difficult for the operator to place the workpiece in the accurate position in one go, resulting in low placement precision and accuracy. Therefore, the position of the workpiece needs to be adjusted multiple times, leading to low efficiency in the entire placement process. This application specifically addresses this issue.

[0046] A front positioning device for a bending machine, as described in the following description. Figure 1 and Figure 2 The device is installed on one side of the bending machine body 1, including a mounting frame 2. A slide 21 is fixedly mounted on the top of the mounting frame 2 by bolts. Multiple slides 21 can be provided, but in this application, only one slide 21 is provided. The length direction of the slide 21 extends parallel to the length direction of the pressure groove. A positioning plate 22 for positioning the workpiece is provided on the slide 21, and an installation and removal mechanism 3 for installing and removing the positioning plate 22 and the slide 21 is also provided on the slide 21.

[0047] The positioning plate 22 allows for quick placement of the workpiece into the appropriate position; simply place the end of the workpiece against the edge of the positioning plate 22. To precisely adjust the position of the positioning plate 22, a spacing adjustment mechanism 4 is also provided on the mounting frame 2 to adjust the distance between the mounting frame 2 and the bending machine body 1.

[0048] Reference Figure 2 The mounting frame 2 has a base 5 at its bottom. The spacing adjustment mechanism 4 is located between the base 5 and the bottom of the mounting frame 2. It includes multiple guide seats 41 fixed on the base 5. The bottom of the mounting frame 2 is slidably mounted on each guide seat 41, which enables the entire mounting frame 2 to slide. The sliding direction is perpendicular to the length direction of the pressure groove. It also includes a position adjustment rack 42 welded and fixed on the slide 21 and a position adjustment gear rotatably mounted on the bottom of the mounting frame 2. The position adjustment rack 42 and the position adjustment gear mesh with each other. When the entire mounting frame 2 is pushed to slide on the base 5, the position adjustment gear and the position adjustment rack 42 are always meshed.

[0049] The position adjustment rack 42 and the position adjustment gear work together to achieve fine adjustment of the moving distance of the mounting frame 2. A distance sensor and an alarm are also installed on the side wall of the mounting frame 2. The distance sensor can measure the distance between the mounting frame 2 and the side wall of the workbench. With the position adjustment gear and the position adjustment rack 42, the distance between the mounting frame 2 and the bending machine body 1 can be adjusted. When the predetermined distance is reached, the alarm will sound to remind the operator that the distance adjustment is complete.

[0050] After adjusting the distance between the mounting bracket 2 and the bending machine body 1, the positioning plate 22 needs to be installed in the correct position. The installation and removal mechanism 3 can quickly install and remove the positioning plate 22.

[0051] Reference Figure 2 and Figure 3 The installation and removal mechanism 3 includes a clamping seat 31 and a clamping assembly 32. There are two clamping seats 31. The bottom of each clamping seat 31 is provided with a sliding groove 311 that is adapted to slide the slide 21. The clamping seat 31 is slidably engaged with the slide 21.

[0052] Two sets of clamping components 32 are also provided corresponding to the clamping seats 31. The two sets of clamping components 32 are located in the corresponding clamping seats 31. Rotating rods 312 are rotatably installed on the top of the two clamping seats 31. The ends of the two rotating rods 312 away from the clamping seats 31 are detachably connected to the positioning plate 22.

[0053] The clamping base 31 is also provided with a pushing component 33 for driving the clamping assembly 32 to clamp and fix it, see reference. Figure 3 , Figure 4 and Figure 5 A linkage component 34 is provided between the rotating rod 312 and the pushing component 33. When the rotating rod 312 is rotated, the linkage component 34 drives the clamping component 32 through the pushing component 33 to clamp the clamping seat 31 onto the slide 21.

[0054] When it is necessary to fix the clamping seat 31 on the slide 21, first, snap the slide groove 311 on the clamping seat 31 into the corresponding position on the slide 21, and then rotate the rotating rod 312. The rotating rod 312 drives the pushing component 33 to move through the linkage component 34. The pushing component 33 drives the wedge block 322 to move, so that the two clamping plates 321 slide towards each other, thereby realizing the quick clamping and fixing of the clamping seat 31.

[0055] Reference Figure 4 and Figure 5The clamping assembly 32 includes two clamping plates 321 slidably mounted within the clamping base 31 and a wedge-shaped block 322 welded and fixed to the two clamping plates 321. The two clamping plates 321 are mounted opposite each other on the inner wall of the clamping base 31, and the pushing assembly 33 can drive the wedge-shaped block 322 to slide, causing the two clamping plates 321 to move closer to each other. The clamping base 31 is provided with a first reset member 6 for resetting the clamping plates 321. The first reset member 6 is a spring, with one end of the spring fixedly connected to the clamping plate 321 and the other end fixedly connected to the clamping base 31.

[0056] Reference Figure 4 and Figure 5 The push assembly 33 is provided in two sets, and the two sets of push assemblies 33 are located on both sides of the slide groove 311. Each set of push assemblies 33 includes a driven gear 331 rotatably installed in the clamping seat 31, a driven rack 332 slidably installed in the clamping seat 31, and a push block 333 welded and fixed to the end of the driven rack 332. The driven gear 331 and the driven rack 332 mesh. When the rotating rod 312 is rotated, the linkage assembly 34 can drive the driven gear 331 to rotate.

[0057] When it is necessary to clamp and fix the clamping seat 31 onto the slide 21, rotate the rotating rod 312. The rotating rod 312 will move through the linkage component 34, causing the linkage component 34 to drive the pushing component 33 to move. The pushing component 33 pushes the clamping component 32 to clamp and fix the clamping seat 31 onto the slide 21, thereby realizing the quick installation of the positioning plate 22.

[0058] Reference Figure 4 and Figure 5 The linkage component 34 includes a sliding plate 341 slidably installed in the clamping seat 31, a first active rack 342 embedded and welded to one end of the sliding plate 341, and two second active racks 343 welded to the other side of the sliding plate 341 and located near the end. The rotating end of the rotating rod 312 is arc-shaped and is fixedly installed with an active gear 313. The active gear 313 meshes with the first active rack 342, and the two second active racks 343 mesh with the corresponding driven gears 331 respectively.

[0059] When it is necessary to clamp and fix the clamping seat 31, first engage the sliding groove 311 on the clamping seat 31 with the corresponding sliding block 21, and then rotate the rotating rod 312 so that the orientation of the rotating rod 312 changes from vertical to horizontal. During the rotation, the driving gear 313 drives the first driving rack 342 to move, causing the sliding plate 341 to move. The movement of the sliding plate 341 drives the two second driving racks 343 to move, causing the two second driving racks 343 to drive the corresponding driven gears 331 to rotate. The driven gears 331 drive the driven racks 332 to move, thereby causing the push block 333 at the end of the driven rack 332 to move, thus realizing the movement of the clamping plate 321.

[0060] The clamping base 31 is provided with a second reset member, which is also a spring. The second reset member can drive the end of the sliding plate 341 away from the driving gear 313 to move towards the driving gear 313, so that the rotating rod 312 tends to rotate in a vertical state. At the same time, it can prevent the sliding plate 341 from easily driving the driven gear 331 to rotate, thus affecting the clamping action of the clamping plate 321.

[0061] The clamping base 31 is also provided with a locking structure 7 for locking the movement of the sliding plate 341, see reference. Figure 4 The locking structure 7 includes a rod 71 that is slidably inserted into the clamping seat 31 and a third reset member 72 for moving the rod 71 toward the surface of the sliding plate 341. A slot 8 is provided on the surface of the sliding plate 341 corresponding to the rod 71. The third reset member 72 is also set as a spring. The third reset member 72 can make the rod 71 move toward the surface of the sliding plate 341.

[0062] When the sliding plate 341 moves and the insertion rod 71 is aligned with the slot 8, the insertion rod 71 can be inserted into the slot 8 under the action of the third reset member 72, making the limiting effect of the insertion rod 71 on the sliding plate 341 more stable.

[0063] The implementation principle of the front positioning device for a bending machine in this embodiment is as follows: When it is necessary to quickly position and place the positioning plate 22, the position of the mounting frame 2 is first adjusted by the spacing adjustment mechanism 4 so that the mounting frame 2 is adjusted to the required position. At this time, the position of the positioning plate 22 can be accurately located at the required position. When the operator places the workpiece, he only needs to push the workpiece to abut against the positioning plate 22 to achieve accurate positioning of the positioning plate 22.

[0064] The installation and removal mechanism 3 enables the slide block 21 to be quickly installed and removed, making the installation and removal of the positioning plate 22 more convenient. This reduces the complicated operations involved in the installation and removal of the positioning plate 22, allowing operators to complete the installation and replacement of the positioning plate 22 more efficiently and improving operational efficiency.

[0065] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A front positioning device for a bending machine, characterized in that: Installed on one side of the worktable of the bending machine body, it includes a mounting frame and a spacing adjustment mechanism provided on the mounting frame for adjusting the distance between the mounting frame and the bending machine body. It also includes a slide on the top of the mounting frame, a positioning plate for positioning the workpiece is provided on the slide, and a disassembly mechanism for detachably connecting the positioning plate and the slide is provided on the slide. The installation and removal mechanism includes multiple clamping seats and a clamping assembly disposed in each clamping seat and used to clamp the clamping seat on the slide. A rotating rod is rotatably mounted on the top of each clamping seat, and the end of each rotating rod away from the clamping seat is connected to the positioning plate. The clamping seat is also provided with a pushing component for driving the clamping assembly to clamp and fix it. A linkage component is provided between the rotating rod and the pushing component. When the rotating rod is rotated, the linkage component drives the clamping assembly to clamp the clamping seat on the slide through the pushing component. The bottom of the clamping seat is provided with a sliding groove that is adapted to slide the slide block. The clamping assembly is provided in two sets. Each set of the clamping assembly includes two clamping plates that are slidably disposed in the clamping seat and a wedge block connected to the two clamping plates. The two clamping plates are installed opposite each other in the inner wall of the clamping seat, and the pushing assembly can drive the wedge block to slide, so that the two clamping plates extend into the sliding groove. The pushing assembly is provided in two sets, with the two sets of pushing assemblies located on both sides of the slide groove. Each set of pushing assemblies includes a driven gear rotatably mounted in the clamping seat, a driven rack slidably mounted in the clamping seat, and a pushing block disposed at the end of the driven rack. The driven gear and the driven rack mesh. When the rotating rod is rotated, the linkage assembly can drive the driven gear to rotate, so that the pushing block can drive the wedge block to slide closer to the slide groove. The linkage component includes a sliding plate slidably disposed in the clamping seat, a first active rack fixed to one side of the sliding plate, and two second active racks fixed to the other side of the sliding plate and located near the end. The rotating end of the rotating rod is arc-shaped and fixed with an active gear. The active gear meshes with the first active rack, and the two second active racks mesh with the corresponding driven gears respectively. When the rotating rod is rotated from a vertical position to a horizontal position, the drive gear drives the sliding plate to move, which in turn drives the clamping assembly to lock through the second drive rack and the pushing assembly.

2. The front positioning device for a bending machine according to claim 1, characterized in that: The clamping seat is provided with a first reset member for driving the clamping plate to reset.

3. The front positioning device for a bending machine according to claim 1, characterized in that: The clamping seat is provided with a second reset member, which can drive the sliding plate to move from the end away from the driving gear to the direction closer to the driving gear.

4. The front positioning device for a bending machine according to claim 1, characterized in that: The clamping base is also provided with a locking structure for locking the movement of the sliding plate.

5. The front positioning device for a bending machine according to claim 4, characterized in that: The locking structure includes a rod that is slidably inserted into the clamping seat. A slot is provided on the sliding plate. When the rod is aligned with the slot, the rod is inserted into the slot.

6. The front positioning device for a bending machine according to claim 5, characterized in that: The locking structure also includes a third reset component for moving the insertion rod toward the surface of the sliding plate.

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