A cutting device for copper mesh processing

Abstract

The utility model belongs to copper screen processing technical field especially is a kind of cutting device for copper screen processing, including support platform, the top side of support platform is provided with a support frame, a cylinder is installed in the top center of the support frame, the telescopic rod of the cylinder is slid through the top surface of the support frame and is connected and fixed with a moving plate;The bottom surface of the moving plate is connected with cutting blade;In the utility model, by being equipped with first guide plate and positioning mechanism, the two first guide plates are driven by positive and negative toothed rod to approach each other or separate, automatic adjustment limiting range is realized, a variety of sizes of copper screen is adapted, and the flexibility and applicability of cutting are enhanced;At the same time, the second guide plate is supplemented to fill the limit vacancy, to ensure that copper screen remains stable and accurate during cutting process, in addition, the design of flattening mechanism effectively flattens copper screen, reduces wrinkle, and improves cutting quality.

Description

Technical Field

[0001] This utility model belongs to the field of copper mesh processing technology, specifically relating to a cutting device for copper mesh processing. Background Technology

[0002] Copper mesh is the main material of a vapor chamber. During processing, it needs to be cut into single pieces of different sizes using a cutting device. In the structure of the vapor chamber, the copper mesh usually serves as the core component of the internal capillary structure. Through its porous and dense mesh pattern, it helps the working fluid (such as pure water) inside the vapor chamber to achieve efficient circulation between the evaporation end and the condensation end, thereby improving the heat dissipation performance of the vapor chamber.

[0003] For example, Chinese utility model patent application number 202422297066.3 discloses a cutting device for processing phosphor bronze mesh. This solution sets an adjustment component on the worktable to adjust the conveying direction of the phosphor bronze mesh so that it is perpendicular to the conveying roller of the conveying component, thereby improving the cutting quality. A clamping component is set on the worktable and corresponds to the position of the cutting groove. Before cutting the phosphor bronze mesh, the phosphor bronze mesh is clamped and limited, and then cut with the cutting component to ensure cutting accuracy and improve product quality.

[0004] However, the aforementioned solution still has shortcomings. The solution uses multiple equally spaced pin holes and locking pins to fix the adjusting plate used for guiding the cutting of copper mesh. Although it is simple to operate, in actual application, the workers need to change the position of the adjusting plate one by one according to the copper mesh of different widths. During the adjustment process, measuring tools such as tape measures are also needed to measure the distance between the two adjusting plates after adjustment. If there is a surplus deviation with the width of the copper mesh, the operation needs to be repeated, which is not only time-consuming, but also detrimental to improving processing efficiency.

[0005] To address the aforementioned problems, this application proposes a cutting device for processing copper mesh sheets. Utility Model Content

[0006] To address the aforementioned problems in the existing technology, this utility model provides a cutting device for processing copper mesh, which features automatic adjustment of guide spacing, guide extension, and auxiliary flattening.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a cutting device for processing copper mesh, comprising a support platform, a first support frame provided on one side of the top of the support platform, a first cylinder installed at the top center of the first support frame, and the telescopic rod of the first cylinder sliding through the top surface of the first support frame and connected and fixed to a first movable plate.

[0008] The bottom surface of the first movable plate is connected to a cutting blade, and the top surface of the first movable plate is provided with symmetrically distributed first guide rods. The first support frame is provided with a first through hole that slides with the first guide rod.

[0009] Also includes:

[0010] The No. 1 flattening mechanism is set on the top of the support platform through the first roller loading plate in the No. 1 flattening mechanism. It has a horizontal pressure roller rotatably connected to the first roller loading plate, which is used to flatten the copper mesh sheet placed on the top surface of the support platform.

[0011] The second flattening mechanism is set on the first movable plate via the second roller plate in the second flattening mechanism. It has a slanted pressure roller that is rotatably connected to the second roller plate, which is used to flatten the copper mesh sheet placed on the top surface of the support platform.

[0012] The positioning mechanism, set on the support platform, includes two symmetrically distributed and movably installed first guide plates for guiding the copper mesh sheet.

[0013] Preferably, a second support frame is provided on the top of the support platform, which is parallel to the first support frame. A second cylinder is installed at the top center of the second support frame. The telescopic rod of the second cylinder slides through the top surface of the second support frame and is connected and fixed to a second movable plate.

[0014] A second guide rod is symmetrically distributed on the top surface of the second movable plate, and a second through hole is provided on the second support frame to slide with the second guide rod;

[0015] The bottom surface of the second movable plate is symmetrically provided with an L-shaped plate;

[0016] The top of the second movable plate is provided with symmetrically distributed first screw caps, and the first screw caps are threadedly connected to the first hand-tightening rods. The first roller plate is installed by limiting the two first hand-tightening rods. The horizontal sections of the first roller plate and the L-shaped plate are both pre-set with third through holes that slide with the first hand-tightening rods.

[0017] The first roller plate can move on the first hand-tightening rod, and its bottom surface contacts the transverse sections of the two L-shaped plates.

[0018] Preferably, each of the two first hand-tightening rods is surrounded by a first spring, and the two ends of the first spring are respectively connected to the second moving plate and the first roller plate. The first roller plate can be moved by the elastic force of the two first springs.

[0019] Preferably, the first moving plate is provided with symmetrically distributed inclined plates;

[0020] A second guide rod is symmetrically distributed on the top surface of the second movable plate, and a fourth through hole is provided on the second support frame to slide with the second guide rod;

[0021] The top of each of the two inclined plates is provided with a second screw cap, and a second hand-tightening rod is threaded onto the second screw cap. The second roller plate is installed by limiting the two second hand-tightening rods. The second roller plate is pre-set with a No. 5 through hole that slides with the second hand-tightening rod, and the second roller plate can move on the second hand-tightening rod.

[0022] Preferably, each of the two second hand-tightening rods is surrounded by a second spring, and the two ends of the second spring are respectively connected to the inclined plate and the second roller plate. The second roller plate can be moved by the elastic force of the two second springs.

[0023] Preferably, symmetrically distributed first elongated holes are provided on the support platform on the side away from the first support frame;

[0024] The positioning mechanism includes symmetrically arranged first guide plates, which are T-shaped. The longitudinal sections of the two first guide plates pass through the first elongated hole, and the transverse sections are parallel above the support platform. The bottom surface of the support platform is provided with symmetrically distributed fixing plates. A positive and negative threaded rod is rotatably mounted between the two fixing plates. One end of the positive and negative threaded rod extends to the outside of the fixing plate and is fixedly connected to the servo motor drive shaft mounted on it.

[0025] The positive and negative threaded screws are threaded with symmetrically arranged threaded plates, and the bottom horizontal sections of the two first guide plates are respectively connected to the threaded plates. The two first guide plates can move closer to or further away from each other through the positive and negative threaded screws.

[0026] A symmetrically arranged limiting slide bar is also provided between the two fixed plates, and a No. 6 through hole is pre-set on both of the threaded plates to slide with the limiting slide bar.

[0027] Preferably, the top of the support platform is further provided with symmetrically distributed second elongated holes, which are located between the first support frame and the second support frame;

[0028] Both of the two threaded plates are fixed with a connecting frame on the side facing the second elongated hole. A second guide plate is connected to the connecting frame. The second guide plate is T-shaped. The longitudinal sections of the two second guide plates pass through the second elongated hole, and the transverse sections are parallel above the support platform. The two second guide plates are slidably connected to the surface of the support platform.

[0029] Compared with the prior art, the beneficial effects of this utility model are:

[0030] In this invention, by configuring a first guide plate and a positioning mechanism, the two first guide plates are driven to move closer or separate with the help of positive and negative threaded rods, thereby achieving automatic adjustment of the limit range, adapting to copper mesh sheets of various sizes, and enhancing the flexibility and applicability of cutting. At the same time, the second guide plate assists in filling the limit gaps, ensuring that the copper mesh sheet remains stable and accurate during the cutting process. In addition, the design of the flattening mechanism effectively flattens the copper mesh sheet, reduces wrinkles, and improves the cutting quality.

[0031] Other additional advantages and benefits of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0032] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0033] Figure 1 This is a schematic diagram of the structure of this utility model;

[0034] Figure 2 for Figure 1 The bottom shows a schematic diagram of the structure;

[0035] Figure 3 for Figure 1 Axonometric three-dimensional structural schematic diagram;

[0036] Figure 4 for Figure 3 A magnified structural diagram of the A mark in the diagram;

[0037] Figure 5 A three-dimensional structural diagram of the No. 2 flattening mechanism;

[0038] Figure 6 for Figure 5 A magnified structural diagram at point B in the diagram.

[0039] In the diagram: 1. Support platform; 2. Support frame 1; 3. Cylinder 1; 4. Guide rod 1; 5. Moving plate 1; 6. Cutting blade; 7. First elongated hole; 8. First guide plate; 9. Fixed plate; 10. Second elongated hole; 11. Second guide plate; 12. Support frame 2; 13. Cylinder 2; 14. Guide rod 2; 15. Moving plate 2; 16. L-shaped plate; 17. Horizontal pressure roller; 18. First roller mounting plate; 19. Positive and negative threaded rods; 20. Limiting slide rod; 21. Threaded plate; 22. Servo motor; 23. Connecting frame; 24. First hand-tightening rod; 25. First spring; 26. First screw cap; 27. Inclined pressure roller; 28. Second roller mounting plate; 29. ​​Inclined plate; 30. Second hand-tightening rod; 31. Second spring; 32. Second screw cap. Detailed Implementation

[0040] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example

[0041] Please see Figures 1-6 The present invention provides the following technical solution: a cutting device for processing copper mesh, including a support platform 1, a first support frame 2 is provided on one side of the top of the support platform 1, a first cylinder 3 is installed at the top center of the first support frame 2, and the telescopic rod of the first cylinder 3 slides through the top surface of the first support frame 2 and is connected and fixed to a first moving plate 5.

[0042] A cutting blade 6 is connected to the bottom surface of the first moving plate 5, and a first guide rod 4 is symmetrically distributed on the top surface of the first moving plate 5. A first through hole is opened on the first support frame 2 to slide with the first guide rod 4.

[0043] Also includes:

[0044] The No. 1 flattening mechanism is set on the top of the support platform 1 by the first roller loading plate 18 in the No. 1 flattening mechanism. It has a horizontal pressure roller 17 rotatably connected to the first roller loading plate 18, which is used to flatten the copper mesh sheet placed on the top surface of the support platform 1.

[0045] The second flattening mechanism is set on the first movable plate 5 via the second roller plate 28 in the second flattening mechanism. It has an inclined pressure roller 27 that is rotatably connected to the second roller plate 28, which is used to flatten the copper mesh sheet placed on the top surface of the support platform 1.

[0046] The positioning mechanism, set on the support platform 1, includes two symmetrically distributed and movably installed first guide plates 8 for guiding the copper mesh sheet.

[0047] Preferably, by Figure 1 , Figure 3 and Figure 4 As shown, in this embodiment, a second support frame 12 is provided on the top of the support platform 1, which is parallel to the first support frame 2. A second cylinder 13 is installed at the top center of the second support frame 12. The telescopic rod of the second cylinder 13 slides through the top surface of the second support frame 12 and is connected and fixed to the second moving plate 15.

[0048] A second guide rod 14 is symmetrically distributed on the top surface of the second movable plate 15, and a second through hole is opened on the second support frame 12 to slide with the second guide rod 14.

[0049] The bottom surface of the second movable plate 15 is symmetrically provided with an L-shaped plate 16;

[0050] The top of the second movable plate 15 is provided with symmetrically distributed first screw caps 26, and the first screw caps 26 are threadedly connected to the first hand-tightening rods 24. The horizontal pressure roller 17 is installed by limiting the two first hand-tightening rods 24. The horizontal sections of the first roller plate 18 and the L-shaped plate 16 are both pre-set with third through holes that slide with the first hand-tightening rods 24.

[0051] The first roller plate 18 can move on the first hand-tightening rod 24, and its bottom surface contacts the transverse sections of the two L-shaped plates 16.

[0052] Both first hand-tightening rods 24 are surrounded by first springs 25. The two ends of the first springs 25 are connected to the second moving plate 15 and the first roller loading plate 18 respectively. The first roller loading plate 18 can be moved by the elastic force of the two first springs 25.

[0053] During the cutting process, starting the second cylinder 13 will drive the horizontal pressure roller 17 to move down. The horizontal pressure roller 17 will first contact and press the copper mesh sheet. Due to its movable design, the second spring 31 is compressed during the downward movement. The first roller mounting plate 18 slides on the two first hand-tightening rods 24, thereby achieving the limitation and fixation of the copper mesh sheet and reducing the probability of miscutting.

[0054] If the elastic potential energy of the first spring 25 decreases after long-term use and it cannot be used normally, the corresponding first hand-tightening rod 24 can be unscrewed and replaced.

[0055] Preferably, by Figure 1 , Figure 5 and Figure 6 As shown, in this embodiment, the first moving plate 5 is provided with symmetrically distributed inclined plates 29;

[0056] A symmetrically distributed guide rod 14 is provided on the top surface of the second movable plate 15, and a fourth through hole is provided on the second support frame 12 to slide with the guide rod 14.

[0057] The top of each of the two inclined plates 29 is provided with a second screw cap 32, and a second hand-tightening rod 30 is threadedly connected to the second screw cap 32. The inclined pressure roller 27 is installed by limiting the two second hand-tightening rods 30. The second roller mounting plate 28 is pre-set with a No. 5 through hole that slides with the second hand-tightening rod 30. The second roller mounting plate 28 can move on the second hand-tightening rod 30.

[0058] The two second hand-tightening rods 30 are each surrounded by a second spring 31. The two ends of the second spring 31 are connected to the inclined plate 29 and the second roller plate 28 respectively. The second roller plate 28 can be moved by the elastic force of the two second springs 31.

[0059] The inclined pressure roller 27 is set at an angle. During the cutting process, the first cylinder 3 will drive the inclined pressure roller 27 to move down. The inclined pressure roller 27 will contact and press the copper mesh first. Due to its inclined movable design, the inclined pressure roller 27 will roll on the copper mesh during the pushing process of the first cylinder 3 (the second spring 31 is compressed and the second roller plate 28 slides on the two second hand-tightening rods 30), and rub the copper mesh with friction, forcing the copper mesh to be straightened in conjunction with the horizontal pressure roller 17, reducing the probability of wrinkles.

[0060] If the elastic potential energy of the second spring 31 decreases after long-term use and it cannot be used normally, the corresponding second hand lever 30 can be unscrewed and replaced.

[0061] Preferably, by Figure 1 and Figure 2 As shown, in this embodiment, symmetrically distributed first elongated holes 7 are provided on the support platform 1 on the side away from the first support frame 2;

[0062] The positioning mechanism includes symmetrically arranged first guide plates 8, which are T-shaped. The longitudinal sections of the two first guide plates 8 pass through the first elongated holes 7 respectively, and the transverse sections are parallel above the support platform 1. The bottom surface of the support platform 1 is provided with symmetrically distributed fixed plates 9. A positive and negative threaded rod 19 is rotatably mounted between the two fixed plates 9. One end of the positive and negative threaded rod 19 extends to the outside of the fixed plate 9 and is fixedly connected to the drive shaft of the servo motor 22 mounted on it.

[0063] The positive and negative threaded screw 19 is threaded with symmetrically arranged threaded plates 21. The bottom horizontal sections of the two first guide plates 8 are respectively connected to the threaded plates 21. The two first guide plates 8 can move closer or further apart from each other through the positive and negative threaded screw 19.

[0064] A symmetrically arranged limiting slide bar 20 is also installed between the two fixed plates 9. Each of the two threaded plates 21 has a No. 6 through hole that slides with the limiting slide bar 20. In use, the copper mesh is laid flat on the support platform 1 and positioned between the two first guide plates 8. Then, by starting the forward rotation mode of the servo motor 22, the two threaded plates 21 are driven to move closer to each other through the forward and reverse threaded screws 19. The movement stops when the copper mesh is just stopped. This setting can be automatically adjusted or adjusted in real time to achieve the function of quickly adjusting the limit, which can improve work efficiency.

[0065] Preferably, by Figure 1 and Figure 2As shown, in this embodiment, the top of the support platform 1 is also provided with symmetrically distributed second elongated holes 10, which are located between the first support frame 2 and the second support frame 12.

[0066] Two threaded plates 21 are each fixed with a connecting frame 23 on the side facing the second elongated hole 10. A second guide plate 11 is connected to the connecting frame 23. The second guide plate 11 is T-shaped. The longitudinal sections of the two second guide plates 11 pass through the second elongated hole 10 respectively, and the transverse sections are parallel above the support platform 1. The two second guide plates 11 are slidably connected to the surface of the support platform 1.

[0067] When the two wire splicing plates 21 move, they can also drive the two second guide plates 11 to move horizontally. The two second guide plates 11 can fill the limiting gap between the first support frame 2 and the second support frame 12, so that the copper mesh can be cut more smoothly and accurately.

[0068] Components not described in detail in this article are existing technologies.

[0069] The working principle and usage process of this utility model are as follows: When in use, the copper mesh sheet is first placed on the support platform 1 and located between the first support frame 2 and the second support frame 12.

[0070] When the servo motor 22 is started, the drive shaft of the servo motor 22 drives the positive and negative thread screw 19 to rotate. As the positive and negative thread screw 19 rotates, the two threaded plates 21 will move closer or further away from each other, thereby driving the two first guide plates 8 to move closer to each other until they just stop the copper mesh. During this process, the limiting slide bar 20 can ensure the stability of the threaded plate 21 during the movement and prevent it from shifting.

[0071] Activate cylinder 13. The telescopic rod of cylinder 13 pushes moving plate 15 down. Moving plate 15 causes L-shaped plate 16 to contact horizontal pressure roller 17 on first roller plate 18. The movable design of horizontal pressure roller 17 and the elastic force of first spring 25 allow horizontal pressure roller 17 to press against the copper mesh, preventing damage to the copper mesh. While pressing the copper mesh, horizontal pressure roller 17 can also make fine adjustments according to the thickness and position of the copper mesh, ensuring that the copper mesh is pressed evenly and can be pulled.

[0072] When the copper mesh sheet is pulled to the cutting position, cylinder 3 is activated. The telescopic rod of cylinder 3 pushes moving plate 5 downward. Moving plate 5 drives cutting blade 6 to cut the copper mesh sheet. At the same time, inclined plate 29 on moving plate 5 also moves downward. Inclined pressure roller 27 on second roller plate 28 contacts and presses the copper mesh sheet. The inclined design of inclined pressure roller 27 and the elastic force of second spring 31 make inclined pressure roller 27 press on the copper mesh sheet to avoid damage to the copper mesh sheet. While pressing the copper mesh sheet, inclined pressure roller 27 can roll on the copper mesh sheet and rub the copper mesh sheet through friction, forcing the copper mesh sheet to be straightened in conjunction with horizontal pressure roller 17, reducing the probability of wrinkles.

[0073] After the copper mesh is pressed, the first moving plate 5 continues to move down and cuts the copper mesh using the cutting blade 6.

[0074] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A cutting device for processing copper mesh sheets, comprising a support table (1), characterized in that, A support frame (2) is provided on one side of the top of the support platform (1). A cylinder (3) is installed at the top center of the support frame (2). The telescopic rod of the cylinder (3) slides through the top surface of the support frame (2) and is connected to and fixed with a moving plate (5). The bottom surface of the first moving plate (5) is connected to a cutting blade (6), and the top surface of the first moving plate (5) is provided with symmetrically distributed first guide rods (4). The first support frame (2) is provided with a first through hole that slides with the first guide rod (4). Also includes: The No. 1 flattening mechanism is set on the top of the support platform (1) by the first roller plate (18) in the No. 1 flattening mechanism. It has a horizontal pressure roller (17) rotatably connected to the first roller plate (18) for flattening the copper mesh placed on the top surface of the support platform (1). The second flattening mechanism is set on the first moving plate (5) through the second roller plate (28) in the second flattening mechanism. It is equipped with a slanted pressure roller (27) that is rotatably connected to the second roller plate (28) for flattening the copper mesh sheet placed on the top surface of the support platform (1). The positioning mechanism is set on the support platform (1) and includes two symmetrically distributed and movably installed first guide plates (8) for guiding the copper mesh.

2. The cutting device for processing copper mesh according to claim 1, characterized in that, The top of the support platform (1) is provided with a second support frame (12) that is parallel to the first support frame (2). A second cylinder (13) is installed at the top center of the second support frame (12). The telescopic rod of the second cylinder (13) slides through the top surface of the second support frame (12) and is connected and fixed to a second moving plate (15). A second guide rod (14) is symmetrically distributed on the top surface of the second movable plate (15), and a second through hole is provided on the second support frame (12) to slide with the second guide rod (14); The bottom surface of the second movable plate (15) is symmetrically provided with an L-shaped plate (16). The top of the second movable plate (15) is provided with symmetrically distributed first screw caps (26), and the first screw caps (26) are threadedly connected with first hand-tightening rods (24). The first roller plate (18) is installed by limiting the two first hand-tightening rods (24). The horizontal sections of the first roller plate (18) and the L-shaped plate (16) are both pre-set with third through holes that slide with the first hand-tightening rods (24). The first roller plate (18) can move on the first hand-tightening rod (24), and its bottom surface contacts the transverse sections of the two L-shaped plates (16).

3. The cutting device for processing copper mesh according to claim 2, characterized in that, Both of the first hand-twisting rods (24) are surrounded by a first spring (25). The two ends of the first spring (25) are connected to the second moving plate (15) and the first roller plate (18) respectively. The first roller plate (18) can be moved by the elastic force of the two first springs (25).

4. The cutting device for processing copper mesh according to claim 2, characterized in that, The first movable plate (5) is provided with symmetrically distributed inclined plates (29); A second guide rod (14) is symmetrically distributed on the top surface of the second moving plate (15), and a fourth through hole is opened on the second support frame (12) to slide with the second guide rod (14); The top of each of the two inclined plates (29) is provided with a second screw cap (32), and a second hand-tightening rod (30) is threaded onto the second screw cap (32). The second roller plate (28) is installed by limiting the two second hand-tightening rods (30). The second roller plate (28) is pre-set with a No. 5 through hole that slides with the second hand-tightening rod (30). The second roller plate (28) can move on the second hand-tightening rod (30).

5. The cutting device for processing copper mesh according to claim 4, characterized in that, The two second hand-twisting rods (30) are each surrounded by a second spring (31). The two ends of the second spring (31) are connected to the inclined plate (29) and the second roller plate (28) respectively. The second roller plate (28) can be moved by the elastic force of the two second springs (31).

6. The cutting device for processing copper mesh according to claim 2, characterized in that, A first elongated hole (7) is symmetrically distributed on the support platform (1) and on the side away from the first support frame (2). The positioning mechanism includes symmetrically arranged first guide plates (8), which are T-shaped. The longitudinal sections of the two first guide plates (8) pass through the first elongated hole (7) respectively, and the transverse sections are parallel above the support platform (1). The bottom surface of the support platform (1) is provided with symmetrically distributed fixing plates (9). A positive and negative threaded rod (19) is rotatably mounted between the two fixing plates (9). One end of the positive and negative threaded rod (19) extends to the outside of the fixing plate (9) and is fixedly connected to the drive shaft of the servo motor (22) mounted on it. The positive and negative threaded screw (19) is threaded with symmetrically arranged threaded plates (21), and the bottom horizontal sections of the two first guide plates (8) are respectively connected to the threaded plates (21). The two first guide plates (8) can move closer to or further away from each other through the positive and negative threaded screw (19). A symmetrically arranged limiting slide rod (20) is also provided between the two fixed plates (9), and a No. 6 through hole is pre-set on both of the threaded plates (21) to slide with the limiting slide rod (20).

7. A cutting device for processing copper mesh according to claim 6, characterized in that, The top of the support platform (1) is also provided with symmetrically distributed second elongated holes (10), which are located between the first support frame (2) and the second support frame (12). Both of the two threaded plates (21) are fixed with a connecting frame (23) on the side facing the second elongated hole (10). A second guide plate (11) is connected to the connecting frame (23). The second guide plate (11) is T-shaped. The longitudinal sections of the two second guide plates (11) pass through the second elongated hole (10) respectively, and the transverse sections are parallel above the support platform (1). The two second guide plates (11) are slidably connected to the surface of the support platform (1).

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