Distance-adjustable paper cutter

Abstract

The utility model provides a distance-adjustable paper cutter, and belongs to the technical field of paper cutting equipment. The paper cutting device comprises a paper placing table and a cutter unit, a paper baffle is arranged on the outer side, located at one end of the cutter unit, of the paper placing table, and the paper baffle is connected with the paper placing table through at least two parallel distance adjusting guide rods. A guide structure capable of enabling the central axis of the distance adjusting guide rod to be parallel to the table top of the paper containing table all the time is arranged between the distance adjusting guide rod and the paper baffle, the front end of the distance adjusting guide rod is fixed to the paper baffle, and the rear end of the distance adjusting guide rod is fixed to the position adjusting connecting plate. A strip-shaped through hole penetrating through the table top of the paper placing table and extending in the length direction of the distance adjusting guide rod is formed in the end, away from the cutter unit, of the paper placing table, a positioning pin penetrating through the strip-shaped through hole is arranged on the position adjusting connecting plate, and a positioning structure is arranged between the positioning pin and the strip-shaped through hole. The position of the paper baffle can be quickly and accurately positioned and fixed, the fixing operation of the paper baffle is convenient, and the positioning precision is high.

Description

Technical Field

[0001] This utility model belongs to the technical field of paper cutting equipment, and relates to an adjustable distance paper cutter. Background Technology

[0002] In paper quality inspection, strict requirements are placed on the quality and size of the samples taken to ensure testing accuracy. Traditional paper cutters typically have a fixed paper baffle or an adjustable baffle via a single guide rod. Fixed baffles cannot adapt to the cutting needs of different paper sizes, while single guide rod adjustment suffers from low adjustment accuracy, poor stability, and cumbersome operation. For example, the single guide rod structure is prone to displacement during the shifting process, which can easily cause the paper baffle to tilt. The low positioning accuracy of the paper baffle affects the cutting accuracy, and the positioning and fixing of the paper baffle is also relatively complex and time-consuming. Utility Model Content

[0003] The purpose of this invention is to address the above-mentioned problems by providing an adjustable distance paper cutter.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] An adjustable-distance paper cutter includes a paper placement platform and a cutting unit. The paper placement platform has a paper baffle located on the outer side of one end of the cutting unit. The paper baffle is connected to the paper placement platform via at least two parallel adjustable guide rods. A guide structure is provided between the adjustable guide rods and the paper baffle to ensure that the central axis of the adjustable guide rod is always parallel to the surface of the paper placement platform. The front end of the adjustable guide rod is fixed to the paper baffle, and the rear end of the adjustable guide rod is fixed to an adjustment connecting plate. A strip-shaped through hole is provided on the end of the paper placement platform away from the cutting unit, penetrating the surface of the paper placement platform and extending along the length of the adjustable guide rod. A positioning pin is provided on the adjustment connecting plate, passing through the strip-shaped through hole. A positioning structure is provided between the positioning pin and the strip-shaped through hole.

[0006] The paper baffle is used to limit the edge of the paper and ensure consistent cutting dimensions. The guide structure ensures that the central axis of the adjusting guide rod is always parallel to the surface of the paper placement table when the paper baffle is moved and adjusted, thus ensuring the stability of the paper baffle during movement and preventing the paper baffle from tilting and affecting cutting accuracy. The positioning structure can quickly and accurately position and fix the paper baffle. The paper baffle fixing operation is convenient and has high positioning accuracy, which can guarantee the cutting accuracy of the paper.

[0007] In the aforementioned adjustable paper cutter, the positioning structure includes a positioning plate disposed within a strip-shaped through hole. The positioning plate has several positioning holes distributed along the length of the adjustable guide rod. The positioning pin can pass through any one of the positioning holes and be inserted into the positioning pin hole of the adjusting connecting plate.

[0008] By pre-setting positioning holes on the positioning plate, a quick and precise fixed connection with the adjustment connecting plate can be achieved, so as to realize the positional adjustment and fixation of the paper baffle. It is highly flexible, the paper baffle fixing operation is convenient, and the positioning accuracy is high.

[0009] In the aforementioned adjustable paper cutter, the positioning structure includes a nut screwed onto the upper end of the positioning pin, the nut being able to abut against the surface of the paper placement table, and the lower end of the positioning pin being fixed to the adjustment connecting plate.

[0010] After the paper baffle is adjusted to the required cutting distance, tighten the nut at the top of the positioning pin so that the nut is pressed tightly against the table surface, thereby achieving quick and stable fixing of the paper baffle with high positioning accuracy.

[0011] In the aforementioned adjustable paper cutter, the guide structure includes at least one slider disposed between the bottom of the paper placement platform and the adjustable guide rod, and a positioning screw is provided on one of the sliders.

[0012] The sliding engagement between the slider and the adjusting guide rod guides the adjusting guide rod, ensuring that the central axis of the adjusting guide rod is always parallel to the surface of the paper placement table, thus preventing the paper baffle from tilting and affecting the cutting accuracy. The positioning screw on the slider is used to position the adjusting guide rod, which helps to fix the paper baffle.

[0013] In the aforementioned adjustable paper cutter, the positioning screw passes through the side of the paper placement platform and has a knob at its outer end.

[0014] The positioning screw can be tightened by turning the knob to make it abut against the adjusting guide rod, thereby positioning the adjusting guide rod and assisting in fixing the paper baffle.

[0015] In the aforementioned adjustable-distance paper cutter, a strip-shaped support step is provided on the inner end of the paper baffle.

[0016] Strip-shaped support steps increase the contact area with the paper, providing stable support and preventing the paper from warping during cutting.

[0017] In the aforementioned adjustable-distance paper cutter, the strip support step includes a support plate, and the support plate is fixed to the paper baffle by several bolts.

[0018] The support plate increases the contact area with the paper, provides stable support, and prevents the paper from warping during cutting. The support plate is easy to install and remove and can be replaced to accommodate different paper thicknesses.

[0019] In the aforementioned adjustable distance paper cutter, the paper placement table has a paper pressure strip initially positioned above the table and close to the cutting unit. A gap is formed between the paper pressure strip and the table. An upper pressure plate is provided on the paper pressure strip. The upper pressure plate is connected to the paper placement table through an automatic return structure. A force-applying structure is provided on the upper pressure plate to apply downward pressure.

[0020] The force-applying structure applies downward pressure to the upper pressure plate, causing the paper pressure bar to press the paper firmly against the table surface. This ensures that the paper is evenly stressed at the cutting position, guaranteeing stability and preventing cutting deviations caused by slippage. After cutting, the automatic return structure allows the paper pressure bar to quickly reset, simplifying the paper change process and improving efficiency.

[0021] In the aforementioned adjustable-distance paper cutter, the automatic return structure includes screws respectively passing through both ends of the upper pressure plate. The screws pass through the table surface of the paper placement platform. A nut post that cooperates with the screws is provided at the bottom end of the table surface. A return spring is sleeved on the screws and located between the upper pressure plate and the nut post. A positioning groove adapted to the return spring is opened on the nut post. A table surface positioning hole adapted to the screws and the return spring is opened on the table surface.

[0022] When the force-applying structure is released, the elastic force of the return spring pushes the upper pressure plate upward, causing the paper pressure bar to automatically return to its initial position. This allows the paper pressure bar to return to its initial position quickly, simplifying the paper change process and improving efficiency.

[0023] In the aforementioned adjustable-distance paper cutter, the force-applying structure includes a first pressure plate and a second pressure plate. One end of the first pressure plate and the second pressure plate are respectively hinged to the studs of the screws at both ends. The bottom end of the first pressure plate and the second pressure plate near the hinge is provided with a force-applying part that abuts against the upper pressure plate. The first pressure plate has a movable groove adapted to the movable end of the second pressure plate. The movable end of the second pressure plate is movably connected in the movable groove. Movable sliding grooves are respectively provided on both sides of the first pressure plate along the length direction of the first pressure plate and connected to the movable groove. The movable end of the second pressure plate has a movable hole adapted to the movable sliding groove. Movable connecting pins are inserted in the movable sliding groove and the movable hole.

[0024] When the user presses down the first pressure plate, the second pressure plate is linked by a sliding hinge in the movable groove. The force-applying parts on the first and second pressure plates can evenly transmit pressure to the upper pressure plate, realizing stable pressing of the paper strip. This can amplify the force application effect, reduce the operating intensity, and the linkage between the first and second pressure plates ensures that the paper is subjected to uniform force and avoids local deformation.

[0025] Compared with existing technologies, the advantages of this invention are: 1. It ensures the stability of the paper baffle during movement, preventing the paper baffle from tilting and affecting cutting accuracy. 2. It can quickly and accurately position and fix the paper baffle, making the fixing operation convenient and providing high positioning accuracy, thus ensuring the cutting precision of the paper. 3. It can firmly fix the paper against the table surface, ensuring uniform force on the cutting position of the paper, guaranteeing stable fixation of the paper during the cutting process, and avoiding cutting deviations caused by slippage. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure provided by this utility model;

[0027] Figure 2 This is a front view provided by this utility model;

[0028] Figure 3 This is a structural diagram of the guide structure and the positioning structure;

[0029] Figure 4 This is a structural schematic diagram of the adjustment connection plate;

[0030] Figure 5 This is a schematic diagram of the paper clamping strip on the tabletop;

[0031] Figure 6 This is a schematic diagram of the force-applying structure;

[0032] Figure 7 This is a schematic diagram of the nut column.

[0033] In the diagram, the components are: 1. Paper placement platform; 2. Cutting unit; 3. Paper baffle; 4. Adjustable guide rod; 5. Platform; 6. Guide structure; 7. Adjustable connecting plate; 8. Strip-shaped through hole; 9. Positioning pin; 10. Positioning structure; 11. Cutting knife; 12. Positioning plate; 13. Positioning hole; 14. Positioning pin hole; 17. Slider; 18. Positioning screw; 19. Knob; 20. Strip-shaped support step; 21. Support plate; 23. Paper pressure strip; 24. Gap; 25. Upper pressure plate; 26. Automatic return structure; 27. Force application structure; 28. Screw; 29. ​​Nut post; 30. Return spring; 31. Positioning groove; 32. Platform positioning hole; 33. First pressure plate; 34. Second pressure plate; 35. Screw; 36. Force application part; 37. Movable groove; 38. Movable slide; 39. Movable hole. Detailed Implementation

[0034] Example 1

[0035] like Figures 1-5As shown, an adjustable paper cutter includes a paper placement platform 1 and a cutting unit 2. The paper placement platform 1 is provided with a paper baffle 3 on the outer side of one end of the cutting unit 2. The paper baffle 3 is connected to the paper placement platform 1 through at least two parallel adjustable guide rods 4. A guide structure 6 is provided between the adjustable guide rods 4 and the paper baffle 3 to ensure that the central axis of the adjustable guide rods 4 is always parallel to the table surface 5 of the paper placement platform 1. The front end of the adjustable guide rods 4 is fixed to the paper baffle 3, and the rear end of the adjustable guide rods 4 is fixed to the adjustment connecting plate 7. A strip-shaped through hole 8 is provided on the end of the paper placement platform 1 away from the cutting unit 2, which penetrates the table surface 5 of the paper placement platform 1 and extends along the length direction of the adjustable guide rods 4. A positioning pin 9 is provided on the adjustment connecting plate 7, which passes through the strip-shaped through hole 8. A positioning structure 10 is provided between the positioning pin 9 and the strip-shaped through hole 8.

[0036] The central axis of the adjustable guide rod 4 is perpendicular to the cutting axis of the cutter unit 2.

[0037] In this utility model, when cutting and sampling paper, the user places the paper tightly against the paper baffle 3 on the table surface 5, and then pushes the paper baffle 3 through the guide structure 6. After the paper baffle 3 is adjusted to the required cutting distance, the position of the paper baffle 3 is fixed by the positioning structure 10. Then, after confirming that the paper is tightly against the paper baffle 3, the cutting unit 2 is operated to complete the paper sampling and cutting.

[0038] The paper baffle 3 is used to limit the edge of the paper to ensure consistent cutting size. The guide structure 6 ensures that the central axis of the adjusting guide rod 4 is always parallel to the table surface 5 of the paper placement table 1 when the paper baffle 3 is moved and adjusted. This ensures the stability of the paper baffle 3 during movement and prevents the paper baffle 3 from tilting, which would affect the cutting accuracy. The positioning structure 10 between the positioning pin 9 and the strip through hole 8 can quickly and accurately position and fix the paper baffle 3. The paper baffle 3 is easy to fix and has high positioning accuracy, which can guarantee the cutting accuracy of the paper.

[0039] The cutting unit 2 includes a cutter 11 hinged to the side wall of the paper placement table 1. The cutter 11 is rotated around the hinge by pressing down to achieve the cutting action.

[0040] Specifically, combining Figures 1-4 As shown, the positioning structure 10 includes a positioning plate 12 disposed in the strip-shaped through hole 8. The positioning plate 12 has a plurality of positioning holes 13 distributed along the length direction of the adjusting guide rod 4. The positioning pin 9 can pass through any one of the positioning holes 13 and be inserted into the positioning pin hole 14 of the adjusting connecting plate 7.

[0041] The positioning plate 12 is fixed to the paper placement table 1 by bolts.

[0042] When the adjusting connecting plate 7 moves and adjusts with the paper baffle 3, the adjusting connecting plate 7 slides and shifts in the length direction of the positioning plate 12. By pre-setting the positioning hole 13 on the positioning plate 12, a quick and accurate fixed connection with the adjusting connecting plate 7 can be achieved, so as to realize the position-type adjustment and fixation of the paper baffle 3. It is highly flexible, the paper baffle 3 is easy to fix, and the positioning accuracy is high.

[0043] Specifically, combining Figures 1-3 As shown, the guide structure 6 includes at least one slider 17 disposed between the bottom of the paper placement table 1 and the adjustable guide rod 4, and a positioning screw 18 is provided on one of the sliders 17. The positioning screw 18 passes through the side of the paper placement table 1 and has a knob 19 at its outer end.

[0044] The sliding engagement between the slider 17 at the bottom of the paper placement table 1 and the adjusting guide rod 4 provides sliding guidance for the adjusting guide rod 4, ensuring that the central axis of the adjusting guide rod 4 is always parallel to the table surface 5 of the paper placement table 1. This prevents the paper baffle 3 from tilting, which would affect the cutting accuracy and ensures the stability of the paper baffle 3 when it moves. The positioning screw 18 can be tightened by the knob 19 to make the positioning screw 18 abut against the adjusting guide rod 4 to position the adjusting guide rod 4, thus assisting in fixing the paper baffle 3.

[0045] Specifically, combining Figures 1-3 As shown, a strip-shaped support step 20 is provided on the inner end of the paper baffle 3. The strip-shaped support step 20 includes a support plate 21, and the support plate 21 is fixed to the paper baffle 3 by several bolts.

[0046] The support plate 21 increases the contact area with the paper, provides stable support, and prevents the paper from warping during cutting. The support plate 21 is easy to install and remove and can be replaced to adapt to different paper thicknesses.

[0047] Specifically, combining Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, a paper pressing strip 23 is provided on the table surface 5 of the paper placement table 1, with its initial position located above the table surface 5 and near the cutter unit 2. A gap 24 is formed between the paper pressing strip 23 and the table surface 5. An upper pressure plate 25 is provided on the paper pressing strip 23. The upper pressure plate 25 is connected to the paper placement table 1 through an automatic return structure 26. A force-applying structure 27 is provided on the upper pressure plate 25 to apply downward pressure to the upper pressure plate 25.

[0048] When the paper is cut and sampled, the paper is located in the gap 24. The force-applying structure 27 can apply downward pressure to the upper pressure plate 25, so that the paper pressure strip 23 presses the paper tightly and fixes the paper firmly against the table surface 5. The cutting position of the paper is evenly stressed, ensuring that the paper is stable and fixed during the cutting process and avoiding cutting deviation caused by slippage. After the cutting is completed, the automatic return structure 26 can quickly reset the paper pressure strip 23, simplifying the paper replacement process and improving efficiency.

[0049] Specifically, combining Figures 5-7 As shown, the automatic return structure 26 includes screws 28 respectively passing through both ends of the upper pressure plate 25. The screws 28 pass through the table surface 5 of the paper placement table 1. A nut post 29 that cooperates with the screws 28 is provided at the bottom of the table surface 5. A return spring 30 located between the upper pressure plate 25 and the nut post 29 is sleeved on the screws 28. A positioning groove 31 adapted to the return spring 30 is opened on the nut post 29. A table surface positioning hole 32 adapted to the screws 28 and the return spring 30 is opened on the table surface 5.

[0050] When the force-applying structure 27 is released, the elastic force of the return spring 30 pushes the upper pressure plate 25 upward, causing the paper pressure bar 23 to automatically return to its initial position. This enables the paper pressure bar 23 to quickly return to its initial position, simplifying the paper replacement process and improving efficiency.

[0051] Specifically, combining Figure 5 and Figure 6 As shown, the force-applying structure 27 includes a first pressure plate 33 and a second pressure plate 34. One end of the first pressure plate 33 and the second pressure plate 34 are respectively hinged to the studs 35 of the screws 28 at both ends. The bottom end of the first pressure plate 33 and the second pressure plate 34 near the hinge is provided with a force-applying part 36 that abuts against the upper pressure plate 25. The first pressure plate 33 is provided with a movable groove 37 that is adapted to the movable end of the second pressure plate 34. The movable end of the second pressure plate 34 is movably connected in the movable groove 37. Movable sliding grooves 38 are respectively provided on both sides of the first pressure plate 33 along the length direction of the first pressure plate 33 and connected to the movable groove 37. The movable end of the second pressure plate 34 is provided with a movable hole 39 that is adapted to the movable sliding groove 38. Movable connecting pins are inserted in the movable sliding groove 38 and the movable hole 39.

[0052] The movable connecting pin passes through the movable hole 39 of the second pressure plate 34 and the movable slide groove 38 of the first pressure plate 33 to form a sliding hinge.

[0053] When the user presses down the first pressure plate 33, the second pressure plate 34 is linked by a sliding hinge in the movable groove 37. The force-applying parts 36 on the first pressure plate 33 and the second pressure plate 34 can evenly transmit pressure to the upper pressure plate 25, so as to achieve stable pressing of the paper pressure strip 23, which can amplify the force application effect, reduce the operation intensity, and the linkage of the first pressure plate 33 and the second pressure plate 34 ensures that the paper is subjected to uniform force and avoids local deformation.

[0054] The working principle of this utility model is as follows: When cutting and sampling paper, the paper is placed in the gap 24, the paper baffle 3 is pushed to move and adjust its position, and the positioning hole 13 is preset on the positioning plate 12 to achieve quick fixation with the adjustment connecting plate 7, thereby realizing the position adjustment and fixation of the paper baffle 3; after the paper baffle 3 is adjusted and fixed, the paper is pressed tightly against the paper baffle 3, then the first pressure plate 33 is pressed down so that the paper pressure strip 23 presses the paper tightly, and finally the cutter 11 is pressed down to complete the paper cutting and sampling.

[0055] Example 2

[0056] The structure and working principle of this embodiment are basically the same as those of Embodiment 1. The difference is that the positioning structure 10 includes a nut that is screwed to the upper end of the positioning pin 9. The nut can abut against the table surface 5 of the paper placement table 1, and the lower end of the positioning pin 9 is fixed to the adjustment connecting plate 7.

[0057] After the paper baffle 3 is adjusted to the required cutting distance, tighten the nut at the upper end of the positioning pin 9 so that the nut is pressed tightly against the table surface 5, thereby achieving rapid fixing of the paper baffle 3. The paper baffle 3 is fixed firmly and has high positioning accuracy.

[0058] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0059] Although this article frequently uses terms such as paper placement platform 1, cutter unit 2, paper baffle 3, adjustable guide rod 4, platform 5, guide structure 6, adjustment connecting plate 7, strip-shaped through hole 8, positioning pin 9, positioning structure 10, cutter 11, positioning plate 12, positioning hole 13, positioning pin hole 14, slider 17, positioning screw 18, knob 19, strip-shaped support step 20, support plate 21, paper pressure strip 23, gap 24, upper pressure plate 25, automatic return structure 26, force application structure 27, screw 28, nut column 29, return spring 30, positioning groove 31, platform positioning hole 32, first pressure plate 33, second pressure plate 34, screw column 35, force application part 36, movable groove 37, movable slide 38, movable hole 39, etc., these terms are used merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any kind of additional limitation would contradict the spirit of this utility model.

Claims

1. An adjustable-distance paper cutter, comprising a paper placement platform (1) and a cutting unit (2), characterized in that, The paper placement platform (1) is located on the outer side of one end of the cutter unit (2) and is provided with a paper baffle (3). The paper baffle (3) is connected to the paper placement platform (1) through at least two parallel adjustable guide rods (4). A guide structure (6) is provided between the adjustable guide rod (4) and the paper baffle (3) to ensure that the central axis of the adjustable guide rod (4) is always parallel to the table surface (5) of the paper placement platform (1). The front end of the adjustable guide rod (4) is fixed on the paper baffle (3), and the rear end of the adjustable guide rod (4) is fixed on the adjustment connecting plate (7). A strip-shaped through hole (8) is provided on the end of the paper placement platform (1) away from the cutter unit (2) that penetrates the table surface (5) of the paper placement platform (1) and extends along the length direction of the adjustable guide rod (4). A positioning pin (9) is provided on the adjustment connecting plate (7) that passes through the strip-shaped through hole (8). A positioning structure (10) is provided between the positioning pin (9) and the strip-shaped through hole (8).

2. The adjustable-distance paper cutter according to claim 1, characterized in that, The positioning structure (10) includes a positioning plate (12) set in the strip-shaped through hole (8). The positioning plate (12) has a plurality of positioning holes (13) distributed along the length of the adjusting guide rod (4). The positioning pin (9) can pass through any one of the positioning holes (13) and be inserted into the positioning pin hole (14) of the adjusting connecting plate (7).

3. The adjustable-distance paper cutter according to claim 1, characterized in that, The positioning structure (10) includes a nut that is screwed onto the upper end of the positioning pin (9). The nut can abut against the table surface (5) of the paper placement table (1). The lower end of the positioning pin (9) is fixed to the adjustment connecting plate (7).

4. The adjustable-distance paper cutter according to claim 1, 2, or 3, characterized in that, The guide structure (6) includes at least one slider (17) disposed between the bottom of the paper placement table (1) and the adjustable guide rod (4), and a positioning screw (18) is provided on one of the sliders (17).

5. The adjustable-distance paper cutter according to claim 4, characterized in that, The positioning screw (18) passes through the side of the paper placement table (1) and has a knob (19) at its outer end.

6. The adjustable-distance paper cutter according to claim 1, 2, or 3, characterized in that, The inner end of the paper baffle (3) is provided with a strip support step (20).

7. The adjustable-distance paper cutter according to claim 6, characterized in that, The strip support step (20) includes a support plate (21), which is fixed to the paper baffle (3) by several bolts.

8. The adjustable-distance paper cutter according to claim 1, 2, or 3, characterized in that, The paper placement table (1) has a paper pressure strip (23) on its table surface (5) with an initial position located above the table surface (5) and close to the cutter unit (2). A gap (24) is formed between the paper pressure strip (23) and the table surface (5). The paper pressure strip (23) has an upper pressure plate (25). The upper pressure plate (25) is connected to the paper placement table (1) through an automatic return structure (26). The upper pressure plate (25) has a force-applying structure (27) that can apply downward pressure to the upper pressure plate (25).

9. The adjustable-distance paper cutter according to claim 8, characterized in that, The automatic return structure (26) includes screws (28) respectively passing through both ends of the upper pressure plate (25). The screws (28) pass through the table surface (5) of the paper placement table (1). A nut post (29) that cooperates with the screws (28) is provided at the bottom of the table surface (5). A return spring (30) located between the upper pressure plate (25) and the nut post (29) is sleeved on the screws (28). A positioning groove (31) adapted to the return spring (30) is opened on the nut post (29). A table surface positioning hole (32) adapted to the screws (28) and the return spring (30) is opened on the table surface (5).

10. The adjustable-distance paper cutter according to claim 9, characterized in that, The force-applying structure (27) includes a first pressure plate (33) and a second pressure plate (34). One end of the first pressure plate (33) and the second pressure plate (34) are respectively hinged to the studs (35) of the two end screws (28). The first pressure plate (33) and the second pressure plate (34) are provided with a force-applying part (36) near the hinge at the bottom end, which abuts against the upper pressure plate (25). The first pressure plate (33) is provided with a movable groove (37) that is adapted to the movable end of the second pressure plate (34). The movable end of the second pressure plate (34) is movably connected in the movable groove (37). The first pressure plate (33) is provided with movable sliding grooves (38) on both sides, which are distributed along the length direction of the first pressure plate (33) and connected to the movable groove (37). The movable end of the second pressure plate (34) is provided with a movable hole (39) that is adapted to the movable sliding groove (38). A movable connecting pin is inserted in the movable sliding groove (38) and the movable hole (39).

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