A paper pressing device

Abstract

The application relates to the raw material paper flattening technical field, in particular to a paper pressing device, which comprises a rack, a stock bin for stacking raw material paper and a flattening air cylinder for pressing the raw material paper are arranged on the rack, a pressing plate for abutting against the raw material paper is fixed on the flattening air cylinder; the stock bin is open at the upper portion, and the raw material paper can abut against the inner wall of the stock bin; a rotating shaft is fixedly arranged at the bottom of the stock bin and rotationally arranged on the rack; a stabilizing mechanism for keeping the bottom of the stock bin horizontal and a swing mechanism for shaking the stock bin are further arranged at the bottom of the rack; the stock bin can rotate back and forth with the rotating shaft as the axis; the stabilizing mechanism and the flattening air cylinder work simultaneously. The application has the effect of pressing the raw material paper in the stock bin after the raw material paper is stacked in order, which is favorable for improving the flattening effect.

Description

Technical Field

[0001] This application relates to the field of paper pressing technology, and in particular to a paper pressing device. Background Technology

[0002] Packaging boxes are commonly used to hold or package products, with paper packaging boxes being particularly prevalent. The processing of paper packaging boxes typically involves laminating multiple layers of raw paper together, printing patterns on them, and finally die-cutting and creasing them into finished packaging boxes of specific dimensions. The first step of lamination usually involves using raw paper cut into individual sheets of a certain size from a roll of raw paper before lamination. However, the ends of the cut raw paper may curl, requiring it to be flattened.

[0003] In related technologies, the flattening of raw paper involves stacking raw materials, applying pressure to the top of the stack using a pressure plate, and then removing the raw paper for further processing after a specified period of pressure. However, during the pressure application process, some of the raw paper with curled ends may unfurl during flattening, causing some of the unfurled paper to protrude beyond the edge of the stack. This protruding portion of the paper cannot withstand pressure during subsequent pressing and may remain curled after the pressing process ends, affecting the overall flatness of the raw paper and consequently the quality of the final packaging box. Summary of the Invention

[0004] In order to improve the problem that some raw paper still curls up after pressure due to protrusion of the raw paper pile, this application provides a paper pressing device.

[0005] This application provides a paper pressing device, which adopts the following technical solution:

[0006] A paper pressing device includes a frame, on which a hopper for stacking raw paper and a flattening cylinder for applying pressure to the raw paper are mounted. A pressure plate for abutting the raw paper is fixed on the flattening cylinder. The hopper has an opening at the top, and the raw paper can abut against the inner wall of the hopper. A rotating shaft is fixedly mounted at the bottom of the hopper and is rotatably mounted on the frame. The bottom of the frame is also provided with a stabilizing mechanism for keeping the bottom of the hopper level and a swinging mechanism for shaking the hopper. The hopper can rotate back and forth about the rotating shaft as an axis. The stabilizing mechanism and the flattening cylinder work simultaneously.

[0007] By adopting the above technical solution, when the stabilizing mechanism is working, it can keep the bottom level. At this time, the flattening cylinder works to drive the pressure plate to apply pressure to the raw paper, causing the raw paper to spread out. After that, the stabilizing mechanism and the flattening cylinder stop working, and the swinging mechanism works to drive the hopper to shake back and forth around the axis of rotation, so that the raw paper can be pushed to stack neatly by the reaction force of the inner wall of the hopper. After stacking neatly, the stabilizing mechanism and the flattening cylinder are switched to work again to continue applying pressure. This process is repeated several times to keep the raw paper under pressure while it is stacked neatly, thereby improving the overall flatness of the raw paper and improving the problem that some raw paper still curls after pressure because it protrudes from the stack of raw paper.

[0008] Optionally, the swing mechanism includes a plurality of drive rods that slide vertically along the frame. Each drive rod has a connecting rod hinged to its top, and the end of the connecting rod away from the drive rod is hinged to the edge of the bottom of the hopper. The drive rods are divided into two groups, with the two groups of drive rods located on opposite sides of the rotating shaft. The two groups of drive rods slide synchronously but in opposite directions. The frame is also provided with a drive unit that allows the drive rods to slide back and forth vertically.

[0009] By adopting the above technical solution, when the drive rod slides back and forth in the vertical direction under the action of the drive unit, one set of drive rods can drive the connecting rod to move down first and then up, while the other set of drive rods can drive the connecting rod on the other side to move up first and then down, thereby causing the bottom plate of the hopper to rotate back and forth around the axis of rotation, thus realizing the shaking of the hopper.

[0010] Optionally, the drive unit includes a plurality of discs rotatably mounted on the frame, each disc corresponding to a drive rod. A rotating rod is hinged to the bottom end of each drive rod, and the end of the rotating rod away from the drive rod is hinged to the edge of the disc. A drive motor for driving the discs to rotate is also fixedly mounted on the frame.

[0011] By adopting the above technical solution, starting the drive motor can drive the disc to rotate. The rotation of the disc can cause one end of the rotating rod to rotate synchronously around the edge of the disc, thereby driving the drive rod to move back and forth in the vertical direction, realizing regular reciprocating movement. There is no need to control the forward and reverse rotation of the motor. The structure is simple and practical.

[0012] Optionally, each of the two disks is coaxially fixed with a drive wheel, and the drive wheel is located on both sides of the rotating shaft; a number of linkage wheels are rotatably arranged on the frame, the linkage wheels are arranged in a row, and adjacent linkage wheels mesh with each other, while each of the two drive wheels can mesh with one of the linkage wheels, and the output shaft of the drive motor is coaxially fixedly connected to one of the linkage wheels.

[0013] By adopting the above technical solution, when the drive motor starts, it can drive the linkage wheel and the drive wheel to rotate simultaneously, and then drive the disc to rotate synchronously; since the drive wheel is located on both sides of the rotating shaft, it corresponds to the rotating shaft connected to the two sets of drive rods, thus enabling the synchronous movement of the two sets of drive rods.

[0014] Optionally, a sliding groove is provided on the inner wall of the hopper, with the top of the sliding groove extending through it. A telescopic baffle is slidably disposed within the sliding groove, and the sliding direction of the telescopic baffle is perpendicular to the plane where the bottom of the hopper is located. At the same time, a return spring is fixedly disposed at the bottom end of the telescopic baffle, and the end of the return spring away from the telescopic baffle is fixed to the inner wall of the sliding groove. The pressure plate can abut against the top of the telescopic baffle. Furthermore, the inner wall of the telescopic baffle and the inner wall of the hopper are located on the same plane.

[0015] By adopting the above technical solution, the side wall of the silo can elastically contract according to the downward pressure distance of the pressure plate, so that the area of ​​the pressure plate can be larger than the cross-sectional area of ​​the silo. This allows the raw paper inside the silo to be pressed by the pressure plate no matter where it is placed, which is beneficial to improving the flattening effect. It is also suitable for stacks of raw paper of different thicknesses.

[0016] Optionally, the bottom wall of the sliding groove is evenly distributed and fixedly provided with a number of baffles, the length direction of the baffles being parallel to the sliding direction of the telescopic baffle; the telescopic baffle can simultaneously slide vertically and connect to the sliding groove and the number of baffles; and the inner wall of the baffles and the inner wall of the telescopic baffle are both located on the same plane.

[0017] By adopting the above technical solution, both the upper layer of raw material paper that abuts against the inner wall of the telescopic baffle and the lower layer of raw material paper that abuts against the inner wall of the hopper and the inner wall of the baffle strip are on the same plane. When the telescopic baffle moves, it helps to maintain the flatness of the stacked raw material paper and reduce the impact of uneven stacking on the flattening effect.

[0018] Optionally, a stop block is slidably provided on the inner wall of the telescopic baffle near the top. The stop block can abut against the upper end of the raw material paper. A stop block spring is fixedly provided on the stop block to keep the stop block protruding from the telescopic baffle. At the same time, a linkage component for driving the stop block to retract into the telescopic baffle is also provided on the telescopic baffle.

[0019] By adopting the above technical solution, the protruding baffle can limit the top of the raw material paper stack, thereby reducing the probability that the raw material paper will fly out from the top of the telescopic baffle when the hopper shakes.

[0020] Optionally, the stop block is provided with a guide surface for forcing the stop block to retract into the telescopic baffle. The linkage includes a connecting rod that is slidably connected to the telescopic baffle. The sliding direction of the connecting rod is parallel to the sliding direction of the telescopic baffle. The top end of the connecting rod slides out of the top end of the telescopic baffle, and the bottom end of the connecting rod abuts against the guide surface. The connecting rod is also provided with an ejector spring for driving the connecting rod to protrude from the upper surface of the telescopic baffle.

[0021] By adopting the above technical solution, when the pressure plate presses down, it can apply pressure to the top of the connecting rod, causing the bottom of the connecting rod to move down. Under the action of the guide surface, the stop block is forced to retract into the telescopic baffle, thereby reducing the probability that the stop block is between the pressure plate and the raw paper stack when the pressure plate applies pressure to the raw paper, which is conducive to improving the flattening effect.

[0022] Optionally, the stabilization mechanism includes several stabilization cylinders fixed to the frame. The extension and retraction axes of the stabilization cylinders are vertical, and the same stabilization plate is fixed on the stabilization cylinders at the same time. The plane of the stabilization plate is parallel to the plane of the pressure plate, and the stabilization plate can abut against the lower surface of the hopper.

[0023] By adopting the above technical solution, when the stabilizing cylinder extends, it can drive the stabilizing plate to abut against the lower surface of the hopper, which helps to keep the hopper reset as soon as possible after shaking, and also helps to make the pressure plate press down more smoothly.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] This allows the raw paper to be stacked evenly by shaking, and then pressed while the raw paper is stacked, thereby improving the overall flatness of the raw paper and improving the problem that some raw paper still curls up after pressure due to protrusion of the raw paper stack.

[0026] The telescopic baffle can elastically retract along with the pressure plate, making it suitable for raw paper stacks of different thicknesses. At the same time, the raw paper can be pressed by the pressure plate no matter where it is in the hopper, which helps to improve the flattening effect.

[0027] When the stop block extends, it can limit the movement of the swaying raw paper stack. When the pressure plate presses down, the stop block can retract into the telescopic stop plate, reducing interference with the pressure plate and improving the flattening effect. Attached Figure Description

[0028] Figure 1 This is a perspective view of an embodiment of this application.

[0029] Figure 2 This is a schematic diagram of the stabilization mechanism and the swing mechanism in the embodiments of this application.

[0030] Figure 3 yes Figure 2The enlarged view at point A in the middle is used to show some detailed structural features of the swing mechanism.

[0031] Figure 4 This is an exploded structural diagram of the silo in an embodiment of this application.

[0032] Figure 5 This is an exploded structural diagram of the block according to an embodiment of this application.

[0033] Explanation of reference numerals in the attached drawings: 1. Frame; 2. Hopper; 3. Feed port; 4. Rotating shaft; 5. Flattening cylinder; 6. Pressure plate; 7. Stabilizing mechanism; 701. Stabilizing cylinder; 702. Stabilizing plate; 8. Swinging mechanism; 801. Drive rod; 802. Connecting rod; 803. Drive unit; 804. Disc; 805. Rotating rod; 806. Connecting shaft; 807. Drive wheel; 808. Linkage wheel; 809. 10. Drive motor; 11. Sliding groove; 12. Stop bar; 13. Telescopic baffle; 14. Return spring; 15. Stop block; 16. Mounting groove; 17. Guide block; 18. Guide groove; 19. Limit block; 20. Stop block spring; 21. Linkage component; 22. Connecting rod; 23. Pulley; 24. Telescopic groove; 25. Guide surface; 26. Support plate; 27. Support groove; 28. Ejection spring; 29. ​​Groove. Detailed Implementation

[0034] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0035] This application discloses a paper pressing device, referring to... Figure 1 The system includes a frame 1 placed on a horizontal surface. Inside the frame 1 is a hopper 2 for stacking raw material paper. The hopper 2 is open at the top, and a feeding port 3 is provided through one of its vertical side walls. A rotating shaft 4 passes through and is fixedly connected to the bottom of the hopper 2. Both ends of the rotating shaft 4 are rotatably connected to the frame 1, and the axis of the rotating shaft 4 is parallel to the direction of the feeding port 3. Two flattening cylinders 5 are fixedly installed at the top of the frame 1. The flattening cylinders 5 are arranged vertically, and the telescopic rods of the two flattening cylinders 5 slide through the frame 1 and are fixedly installed with the same pressure plate 6. The lower surface of the pressure plate 6 can abut against the raw material paper inside the hopper 2. At the bottom of the frame 1, there is a stabilizing mechanism 7 for keeping the bottom of the hopper 2 horizontal and a swinging mechanism 8 for shaking the hopper 2. The swinging mechanism 8 and the stabilizing mechanism 7 act alternately on the hopper 2.

[0036] Reference Figure 1 and Figure 2The stabilization mechanism 7 is located in the middle of the bottom of the frame 1. The stabilization mechanism 7 includes four stabilization cylinders 701 fixedly installed at the bottom of the frame 1. The stabilization cylinders 701 are all vertically installed. The same stabilization plate 702 is fixedly connected to the telescopic rod of the four stabilization cylinders 701. The stabilization plate 702 is horizontally installed, and the upper surface of the stabilization plate 702 can abut against the bottom of the hopper 2, thereby keeping the lower surface of the hopper 2 horizontal, which facilitates the flattening cylinder 5 to drive the pressure plate 6 to flatten the raw material paper inside the hopper 2.

[0037] Reference Figures 1 to 3 The swing mechanism 8 includes four drive rods 801 that slide vertically to the frame 1. Each drive rod 801 has a connecting rod 802 hinged to its top. The end of the connecting rod 802 away from the drive rod 801 is hinged to the bottom of the hopper 2. The hinge axes at both ends of the connecting rod 802 are parallel to the axis of the rotating shaft 4. The four drive rods 801 are located near the four corners of the hopper 2. The four drive rods 801 are divided into two groups according to the position of the rotating shaft 4. The two drive rods 801 on the same side of the rotating shaft 4 form one group. The two drive rods 801 in the same group slide synchronously in the same direction, while the two drive rods 801 in different groups slide synchronously in opposite directions. This causes the connecting rod 802 to pull the bottom plate, making the bottom plate rotate back and forth along the axis of the rotating shaft 4.

[0038] Reference Figure 2 and Figure 3 The swing mechanism 8 also includes a drive unit 803 that causes the drive rod 801 to slide back and forth in the vertical direction. The drive unit 803 includes a plurality of disks 804 rotatably mounted on the frame 1, the number of disks 804 being the same as the number of drive rods 801. A rotating rod 805 is hinged to the edge of each disk 804. The end of the rotating rod 805 away from the disk 804 is hinged to the bottom end of the drive rod 801, and the hinge axes at both ends of the rotating rod 805 are parallel to the hinge axes at both ends of the connecting rod 802. The axis of the disk 804 is also parallel to the hinge axes at both ends of the rotating rod 805.

[0039] Reference Figure 2 and Figure 3 In the same group, the discs 804 corresponding to the two drive rods 801 are simultaneously fixedly connected to the same connecting shaft 806, and the connecting shaft 806 is rotatably connected to the frame 1. The discs 804 and the connecting shaft 806 are coaxial, and drive wheels 807 are coaxially fixed on both connecting shafts 806. Several linkage wheels 808 are also rotatably arranged on the frame 1. The linkage wheels 808 are arranged in a row, and adjacent linkage wheels 808 mesh with each other. Each drive wheel 807 can mesh with one of the linkage wheels 808. A drive motor 809 is also fixedly installed on the frame 1. The output shaft of the drive motor 809 rotatably passes through the frame 1 and is fixedly connected to one of the linkage wheels 808.

[0040] In this embodiment, the bottom plate of the silo 2 is horizontal as the starting position. The bottom starting positions of the rotating rods 805 corresponding to the two drive rods 801 in the same group are the same. The bottom starting positions of the rotating rods 805 corresponding to the two drive rods 801 in different groups are symmetrical along the vertical plane where the rotating shaft 4 is located. The number of linkage wheels 808 is odd. The linkage wheels 808 at the beginning and end of the row are respectively engaged with one drive wheel 807, so that the two drive wheels 807 rotate in the same direction. This causes the two rotating rods 805 in different groups to move in the following ways: one rotates downward from the initial position and the other rotates upward from the initial position. This causes the drive rods 801 in different groups to slide in opposite directions.

[0041] Reference Figure 1 and Figure 4 Each of the three vertical inner walls of the hopper 2 is provided with a sliding groove 10. The sliding grooves 10 on the three inner walls of the hopper 2 are interconnected and extend vertically. The top of the sliding groove 10 is through, and the bottom of the sliding groove 10 is flush with the bottom inner wall of the hopper 2. Several baffles 11 are evenly distributed and fixedly installed at the bottom of the sliding groove 10. The baffles 11 are all vertically installed, and only the bottom of the baffles 11 is fixed to the bottom of the sliding groove 10. The other side walls of the baffles 11 have gaps with the sliding groove 10, and there are also gaps between the baffles 11. The upper surface of the baffles 11 is flush with the upper surface of the hopper 2.

[0042] Reference Figure 1 and Figure 4 A telescopic baffle 12 is vertically slidable in the sliding groove 10, and the telescopic baffle 12 can simultaneously slide and connect to the sliding groove 10 and the baffle 11 in the vertical direction. At the same time, the inner wall of the baffle 11 and the inner wall of the telescopic baffle 12 are flush with the inner wall of the hopper 2. A return spring 13 is also fixedly installed at the bottom of the telescopic baffle 12. The return spring 13 is vertically installed, and the end of the return spring 13 away from the telescopic baffle 12 is fixedly connected to the bottom of the sliding groove 10. The top of the telescopic baffle 12 abuts against the pressure plate 6, so that the telescopic baffle 12 can elastically extend and retract according to the downward pressing distance of the pressure plate 6.

[0043] Reference Figure 4 and Figure 5Several blocks 14 are provided on the side wall near the top of the telescopic baffle 12. The blocks 14 can protrude from the vertical inner wall of the telescopic baffle 12, so that the lower surface of the blocks 14 can abut against the raw material paper inside the hopper 2. The inner wall of the telescopic baffle 12 is provided with an installation groove 15, and the blocks 14 can slide horizontally and be connected to the installation groove 15. At the same time, guide blocks 16 are fixedly provided on the two opposite side walls of the blocks 14. The inner wall of the installation groove 15 is provided with a guide groove 17 for the guide blocks 16 to slide. The end of the guide groove 17 facing the inner wall of the hopper 2 is detachably and fixedly connected to a limit block 18. When the limit block 18 is removed, it facilitates the installation of the blocks 14. When the limit block 18 is installed, it can limit the guide blocks 16 and reduce the probability of the blocks 14 disengaging from the installation groove 15. A stop spring 19 is also fixedly installed on the side wall of the stop block 14. The stop spring 19 is horizontally installed, and the end of the stop spring 19 away from the stop block 14 is fixedly connected to the inner wall of the mounting groove 15. The stop spring 19 can keep the stop block 14 in a protruding state.

[0044] Reference Figure 5 The telescopic baffle 12 is also equipped with a linkage 20 for pushing the stop 14 into the telescopic baffle 12. The linkage 20 includes a connecting rod 21 that slides vertically to the telescopic baffle 12. The bottom end of the connecting rod 21 can pass vertically into the mounting groove 15, and a pulley 22 is rotatably provided at the bottom end of the connecting rod 21. At the same time, a telescopic groove 23 is formed on the upper surface of the stop 14, and an inclined guide surface 24 is formed at the bottom end of the telescopic groove 23. The side of the guide surface 24 facing the stop spring 19 is higher than the side of the guide surface 24 away from the stop spring 19. The pulley 22 at the bottom end of the connecting rod 21 can slide to connect to the guide surface 24.

[0045] Reference Figure 5 A support plate 25 is fixedly installed at the top of the connecting rod 21. The support plate 25 is horizontally positioned, and its cross-sectional area is larger than that of the connecting rod 21. A support groove 26 for accommodating the support plate 25 is also provided on the upper surface of the telescopic baffle 12. Two ejector springs 27 are also fixedly installed on the support plate 25. The ejector springs 27 are vertically positioned, and a groove 28 is provided on the support groove 26. The bottom end of the ejector spring 27 is fixedly connected to the inner wall of the groove 28.

[0046] When the pressure plate 6 is pressed down, it can abut against the upper surface of the support plate 25, thereby pressing down the support plate 25. When the connecting rod 21 moves down in the vertical direction, it pushes the pulley 22 to slide on the guide surface 24. Then, under the guidance of the guide surface 24, the stop block 14 is retracted into the mounting groove 15, reducing the impact of the stop block 14 on the contact between the pressure plate 6 and the raw material paper.

[0047] The implementation principle of a paper pressing device in this application embodiment is as follows: When the raw paper is flattened, the raw paper is first stacked and placed into the hopper 2; then the stabilizing cylinder 701 is activated to raise the stabilizing plate 702 until it abuts against the lower surface of the hopper 2, and the flattening cylinder 5 is activated to drive the pressing plate 6 to abut against the upper surface of the telescopic baffle 12; at this time, during the downward movement of the pressing plate 6, pressure is first applied to the support plate 25, pushing the connecting rod 21 downward and, under the guidance of the guide surface 24, driving the stop block 14 to retract into the mounting groove 15, and then abutting against the upper surface of the telescopic baffle 12, pushing the telescopic baffle 12 downward until the pressing plate 6 abuts against the stack of raw paper, thereby realizing the flattening step;

[0048] Then, the stabilizing cylinder 701 and the flattening cylinder 5 are retracted. At this time, the telescopic baffle 12 is reset under the action of the reset spring 13, and the stop block 14 and the connecting rod 21 are also reset under the action of the stop block spring 19 and the ejection spring 27, respectively. The drive motor 809 is started to drive the disc 804 to rotate. Then, under the drive of the rotating rod 805, the drive rod 801 and the connecting rod 802, the bottom of the hopper 2 is made to rotate back and forth along the axis of the rotating shaft 4, so as to realize the shaking of the hopper 2, so that the raw material paper abuts against the inner wall of the telescopic baffle 12 or the inner wall of the hopper 2, thereby realizing the stacking step. The flattening step and the stacking step are repeated many times, so that the raw material paper is flattened in the stacked state, improving the flattening effect.

[0049] The above are preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made to the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A paper pressing device, characterized in that: The machine includes a frame (1), on which a hopper (2) for stacking raw material paper and a flattening cylinder (5) for applying pressure to the raw material paper are provided. A pressure plate (6) for abutting the raw material paper is fixed on the flattening cylinder (5). The hopper (2) has an opening at the top, and the raw material paper can abut against the inner wall of the hopper (2). A rotating shaft (4) is fixedly provided at the bottom of the hopper (2), and the rotating shaft (4) is rotatably mounted on the frame (1). The bottom of the frame (1) is also provided with a stabilizing mechanism (7) for keeping the bottom of the hopper (2) horizontal and a swinging mechanism (8) for shaking the hopper (2). The hopper (2) can rotate back and forth about the rotating shaft (4) as an axis. The stabilizing mechanism (7) The pressure plate (6) works simultaneously with the flattening cylinder (5). A sliding groove (10) is provided on the inner wall of the hopper (2). The top of the sliding groove (10) is through. A telescopic baffle (12) is slidably installed in the sliding groove (10). The sliding direction of the telescopic baffle (12) is perpendicular to the plane where the bottom of the hopper (2) is located. At the same time, a return spring (13) is fixedly installed at the bottom end of the telescopic baffle (12). The end of the return spring (13) away from the telescopic baffle (12) is fixed to the inner wall of the sliding groove (10). The pressure plate (6) can abut against the top of the telescopic baffle (12). The inner wall of the telescopic baffle (12) and the inner wall of the hopper (2) are located on the same plane. The sliding groove (10) The bottom wall is uniformly distributed and fixedly provided with several baffles (11), the length direction of which is parallel to the sliding direction of the telescopic baffle (12); the telescopic baffle (12) can simultaneously slide vertically and be connected to the sliding groove (10) and several baffles (11); and the inner wall of the baffles (11) and the inner wall of the telescopic baffle (12) are both located on the same plane. A stop block (14) is slidably provided on the inner wall of the telescopic baffle (12) near the top. The stop block (14) can abut against the upper end of the raw material paper. A stop block spring (19) is fixedly provided on the stop block (14) to keep the stop block (14) protruding from the telescopic baffle (12). At the same time, the telescopic baffle (12) also has A linkage (20) is provided for driving the stop (14) to retract into the telescopic baffle (12). The stop (14) is provided with a guide surface (24) for forcing the stop (14) to retract into the telescopic baffle (12). The linkage (20) includes a connecting rod (21) that is slidably connected to the telescopic baffle (12). The sliding direction of the connecting rod (21) is parallel to the sliding direction of the telescopic baffle (12). The top end of the connecting rod (21) slides out of the top end of the telescopic baffle (12), and the bottom end of the connecting rod (21) abuts against the guide surface (24). The connecting rod (21) is also provided with an ejector spring (27) for driving the connecting rod (21) to protrude from the upper surface of the telescopic baffle (12).

2. The paper pressing device according to claim 1, characterized in that: The swing mechanism (8) includes a plurality of drive rods (801) that slide vertically on the frame (1). Each drive rod (801) has a connecting rod (802) hinged to its top. The end of the connecting rod (802) away from the drive rod (801) is hinged to the edge of the bottom of the hopper (2). The plurality of drive rods (801) are divided into two groups. The two groups of drive rods (801) are located on both sides of the rotating shaft (4). The two groups of drive rods (801) slide synchronously but in opposite directions. The frame (1) is also provided with a drive part (803) that causes the drive rods (801) to slide back and forth vertically.

3. The paper pressing device according to claim 2, characterized in that: The drive unit (803) includes a plurality of discs (804) rotatably mounted on the frame (1). Each disc (804) corresponds to a drive rod (801). A rotating rod (805) is hinged to the bottom end of the drive rod (801). The end of the rotating rod (805) away from the drive rod (801) is hinged to the edge of the disc (804). A drive motor (809) for driving the discs (804) to rotate is also fixedly mounted on the frame (1).

4. A paper pressing device according to claim 3, characterized in that: Each of the two discs (804) has a drive wheel (807) fixed coaxially, and the drive wheel (807) is located on both sides of the rotating shaft (4); the frame (1) is rotatably provided with a number of linkage wheels (808), the linkage wheels (808) are arranged in a row, and the adjacent linkage wheels (808) mesh with each other. At the same time, each of the two drive wheels (807) can mesh with one of the linkage wheels (808), and the output shaft of the drive motor (809) is coaxially fixedly connected to one of the linkage wheels (808).

5. A paper pressing device according to claim 1, characterized in that: The stabilization mechanism (7) includes several stabilization cylinders (701) fixed to the frame (1). The extension axis of the stabilization cylinder (701) is vertical, and the same stabilization plate (702) is fixed on the stabilization cylinder (701). The plane of the stabilization plate (702) is parallel to the plane of the pressure plate (6), and the stabilization plate (702) can abut against the lower surface of the hopper (2).

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