Paperboard film covering device for paperboard processing

Abstract

The invention relates to the technical field of paperboard processing, and discloses a paperboard film laminating device for paperboard processing, which comprises a rack, a conveying unit arranged on the rack and used for conveying paperboards, a film feeding roller unit used for unwinding a film, a hot-pressing laminating unit used for laminating the film and the paperboards, and a flattening roller unit, each flattening roller unit comprises a roller body, end covers detachably arranged at the two ends of the roller body and a sleeve fixedly connected to the periphery of the roller body in a sleeving mode, multiple sets of adjusting modules capable of sliding in the radial direction are arranged on the roller body in the axial direction of the roller body, the multiple sets of adjusting modules and the sleeves jointly form a flattening roller face, and movable cavities are symmetrically formed in the two ends of the roller body; and a conical driving sleeve is connected in each group of movable cavities in a sliding manner. According to the invention, the flattening roller unit provided with the adjusting modules capable of sliding in the radial direction and the conical driving sleeve is arranged, and the multiple groups of adjusting modules and the sleeve jointly form the flattening roller surface capable of switching between a straight state and an arc-shaped state, so that the shape of the flattening roller surface is dynamically adjustable.

Description

Technical Field

[0001] This invention relates to the field of paperboard processing technology, and more particularly to a paperboard laminating apparatus for paperboard processing. Background Technology

[0002] Cardboard laminating machines are key equipment in the post-processing of paper packaging. Their working principle is to apply transparent plastic films made of polypropylene, polyvinyl chloride, polyester, etc., to the surface of printed cardboard through hot or cold pressing to achieve the effects of protection, beautification, and enhanced durability. Currently, it is a core link in ensuring the durability and commercial value of high-end packaging boxes, book covers, advertising posters, and other products.

[0003] An automated cardboard laminating device disclosed in CN117021561A includes a first conveyor, a second conveyor, and a laminating unit arranged sequentially. A processing table is provided between the first and second conveyors, and a single-sheet screening mechanism is provided on the top of the processing table. The single-sheet screening mechanism includes a rotatable screening rod with multiple screening seats installed on the screening rod. Each screening seat is provided with a screening plate, and the bottom end of the screening plate forms a screening opening between it and the second conveyor for single-sheet cardboard to pass through. Although the above technical solution can significantly reduce the gap between two adjacent cardboard sheets after the subsequent laminating process, thereby effectively reducing film loss at the gap and improving the utilization rate of film materials.

[0004] In existing paperboard laminating technology, the flattening effect of the film directly determines the quality of the final product. However, existing paperboard laminating equipment generally uses flattening rollers with fixed geometric shapes, such as straight rollers or curved rollers with fixed curvature. The structural characteristics of these fixed flattening rollers determine that they can only act on the film surface with a preset, constant flattening force and contact angle, lacking the ability to dynamically adjust according to the actual state of the film. In actual production, factors such as the material and thickness of the film will cause differences in the tension it bears during transportation. For films with uneven tension or large instantaneous tension that are prone to wrinkling, if a fixed-shape flattening roller is forcibly used, there may be problems of undercorrection or overcorrection. Undercorrection will cause the flattening force of the fixed flattening roller to be unable to effectively cope with uneven tension or offset excessive tension, so that the film still has wrinkles such as wavy edges and wavy lines when laminating, which seriously affects the product appearance and lamination quality. Overcorrection may introduce new tension damage or even cause the film to break. Summary of the Invention

[0005] The purpose of this invention is to provide a paperboard laminating apparatus for paperboard processing, in order to solve the problem mentioned in the background art that the existing paperboard laminating apparatus has poor dynamic adaptability in terms of film flattening and cannot effectively deal with wrinkling defects caused by changes in film tension.

[0006] The present invention provides a paperboard laminating device for paperboard processing, which adopts the following technical solution: A paperboard laminating apparatus for paperboard processing includes a frame, a conveying unit mounted on the frame for conveying paperboard, a film feeding roller unit for unwinding film, and a hot pressing laminating unit for pressing the film and paperboard together, and further includes: A flattening roller unit is disposed between the film feeding roller unit and the hot pressing and laminating unit, and is used to flatten the film during transportation; The flattening roller unit includes a roller body, end caps detachably disposed at both ends of the roller body, and sleeves fixedly sleeved around the outer periphery of the roller body. Multiple sets of radially sliding adjustment modules are arranged along the axial direction of the roller body. The multiple sets of adjustment modules and the sleeves together form the flattening roller surface. The roller body has symmetrically opened movable cavities at both ends. Each set of movable cavities is slidably connected to a conical drive sleeve. The axial sliding of the conical drive sleeve drives the multiple sets of adjustment modules to generate radial displacement, so that the flattening roller surface switches between a flat state and an arc state.

[0007] Furthermore, each set of adjustment modules includes multiple sets of fan-shaped sliders equidistantly distributed along the circumference of the roller body. Each set of fan-shaped sliders has a guide rod fixed on its inner side. The guide rod extends into the movable cavity, and its end is connected to a roller through a rotating shaft. The roller makes rolling contact with the outer surface of the conical drive sleeve. A first spring is sleeved on the guide rod, and the two ends of the first spring are fixed to the guide rod and the inner wall of the movable cavity, respectively.

[0008] Furthermore, the conical drive sleeve includes a cylindrical section and a conical section connected to one end of the cylindrical section; When the roller contacts the cylindrical section, the outer surface of the multiple sets of fan-shaped sliders is flush with the outer surface of the sleeve. When the roller contacts the conical section, the axial movement of the conical drive sleeve causes the fan-shaped slider to be pushed outward radially through the inclined surface of the conical section.

[0009] Furthermore, each of the movable cavities is equipped with an adjustment mechanism. The adjustment mechanism includes a mandrel fixed in the movable cavity, a cavity opened in the mandrel, a hydraulic cylinder installed in the cavity, an elastic reservoir on the outside of the end cap, and both the elastic reservoir and the hydraulic cylinder are filled with hydraulic oil. The elastic reservoir and the hydraulic cylinder are connected in a through connection. A piston rod is slidably connected in the hydraulic cylinder, and a second spring is sleeved on the piston rod. The two ends of the second spring are respectively fixed to the piston rod and the inner wall of the hydraulic cylinder. One end of the piston rod extends out of the hydraulic cylinder and is fixed with a connecting block. The connecting block is fixed to the conical drive sleeve by a sliding rod.

[0010] Furthermore, a guide rail is provided on the mandrel, and the slide rod is slidably disposed within the guide rail.

[0011] Furthermore, both ends of the roller are mounted on the frame via a floating support mechanism. The floating support mechanism includes a support plate. The end of the roller is rotatably connected to the support plate via a bearing. A support shaft is connected to the support plate. The support shaft slides through a bushing fixed on the frame. A third spring is sleeved on the support shaft. The two ends of the third spring are respectively fixed to the support plate and the bushing.

[0012] Furthermore, the frame is provided with a squeezing mechanism corresponding to the elastic reservoir. The squeezing mechanism includes a vertical shaft fixed on the frame, a sleeve block slidably sleeved on the vertical shaft, and a pressure block fixed at the bottom of the sleeve block. The pressure block contacts the elastic reservoir and is used to squeeze the elastic reservoir. A fourth spring is sleeved on the vertical shaft, and the two ends of the fourth spring are respectively fixed on the sleeve block and the frame.

[0013] Furthermore, a gap is left between two adjacent sets of fan-shaped sliders, and two adjacent sets of fan-shaped sliders distributed along the axial direction of the roller are connected by an elastic connecting piece. The outer surfaces of the sleeve and multiple sets of fan-shaped sliders are covered with an elastic protective sleeve.

[0014] Furthermore, a support sleeve is fixedly installed on the end face of the end cap away from the roller body. The support sleeve is sleeved on one side end face of the elastic liquid storage bladder to limit and support the elastic liquid storage bladder.

[0015] Furthermore, a limit ring is fixedly connected inside the hydraulic cylinder, and the other end of the piston rod contacts the limit ring.

[0016] The beneficial effects of this invention are: By setting up a flattening roller unit with radially sliding adjustment modules and a conical drive sleeve, and by having multiple sets of adjustment modules and sleeves together form a flattening roller surface that can switch between a flat state and an arc state, the shape of the flattening roller surface is dynamically adjustable. This allows the device to adjust the curvature and flattening force of the flattening roller surface according to the actual tension of the film, thereby effectively solving the problem of insufficient or excessive correction of existing fixed-shape flattening rollers when dealing with different film tensions. This effectively avoids wrinkling phenomena such as wavy edges and wavy lines caused by uneven tension during film lamination, thus improving the quality and yield of laminated products.

[0017] Through the cooperation of the floating support mechanism, the adjustment mechanism and the extrusion mechanism, the curvature of the flattening roller surface is dynamically adjusted. When the film tension increases, the flattening roller unit can float vertically and convert this tension change into a hydraulic signal to drive the conical drive sleeve in the adjustment mechanism to slide axially, thereby increasing the curvature of the flattening roller surface to enhance the flattening force. When the film tension decreases, the curvature of the flattening roller surface can be reduced, so that the flattening roller can adapt to the change in film tension, continuously maintain the best flattening state and improve the coating effect. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the frame, film feeding roller unit, hot pressing laminating unit and flattening roller unit of the present invention. Figure 3 This is a three-dimensional structural diagram of the frame and flattening roller unit of the present invention; Figure 4 This is a partial cross-sectional view of the three-dimensional structure of the flattening roller unit of the present invention; Figure 5 This is a side view cross-sectional diagram of the flattening roller unit and the adjusting mechanism of the present invention; Figure 6 This is a three-dimensional structural diagram of the adjustment module, the tapered drive sleeve, and the elastic connecting piece of the present invention. Figure 7 This is an exploded three-dimensional structural diagram of the fan-shaped slider and the elastic connecting piece of the present invention; Figure 8 This is a schematic cross-sectional view of a partial three-dimensional structure of the roller body of the present invention; Figure 9 For the present invention Figure 8 Enlarged schematic diagram of the structure at point A in the middle; Figure 10 This is a three-dimensional cross-sectional view of the conical drive sleeve, mandrel, hydraulic cylinder, and elastic reservoir of the present invention. Figure 11 This is a three-dimensional structural diagram of the mandrel of the present invention; Figure 12 This is a three-dimensional structural diagram of the flattening roller unit, adjusting mechanism, and floating support mechanism of the present invention. Figure 13 This is an exploded three-dimensional structural diagram of the vertical shaft, sleeve block, pressure block, and fourth spring of the present invention.

[0019] In the picture: 1. Frame; 2. Conveying unit; 3. Film feeding roller unit; 4. Hot pressing and laminating unit; 5. Flattening roller unit; 51. Roller body; 52. End cap; 521. Support sleeve; 53. Sleeve; 54. Adjustment module; 541. Sector-shaped slider; 542. Guide rod; 543. First spring; 544. Rotating shaft; 545. Roller; 55. Movable cavity; 56. Conical drive sleeve; 57. Elastic connecting piece; 58. Elastic protective sleeve; 6 61. Adjustment mechanism; 62. Mandrel; 63. Cavity; 64. Hydraulic cylinder; 65. Limiting ring; 66. Elastic reservoir; 67. Piston rod; 68. Second spring; 69. Connecting block; 70. Slide rod; 71. Guide rail; 72. Floating support mechanism; 73. Support plate; 74. Support shaft; 85. Bushing; 86. Third spring; 87. Compression mechanism; 88. Vertical shaft; 89. Sleeve block; 80. Pressure block; 81. Fourth spring. Detailed Implementation

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0021] Reference Figures 1-3 The present invention provides a paperboard laminating device for paperboard processing, including a frame 1, a conveying unit 2 disposed on the frame 1 for conveying paperboard, a film feeding roller unit 3 for unwinding film, and a hot pressing laminating unit 4 for pressing film and paperboard together. In order to achieve dynamic flattening of film, the present invention provides a flattening roller unit 5, which is disposed between the film feeding roller unit 3 and the hot pressing laminating unit 4, for flattening film during conveying.

[0022] Specifically, refer to Figures 4-5 The flattening roller unit 5 includes a roller body 51, end caps 52 detachably disposed at both ends of the roller body 51, and sleeves 53 fixedly sleeved around the outer periphery of the roller body 51. Multiple sets of radially sliding adjustment modules 54 are arranged along the axial direction of the roller body 51. The multiple sets of adjustment modules 54 and the sleeves 53 together constitute the flattening roller surface. The roller body 51 has symmetrically opened movable cavities 55 at both ends. Each set of movable cavities 55 is slidably connected to a conical drive sleeve 56. The axial sliding of the conical drive sleeve 56 drives the multiple sets of adjustment modules 54 to generate radial displacement, so that the flattening roller surface switches between a flat state and an arc state, thereby changing the shape of the flattening roller surface.

[0023] Reference Figures 6-7Each adjustment module 54 includes multiple sets of fan-shaped sliders 541 equidistantly distributed along the circumference of the roller body 51. Each set of fan-shaped sliders 541 has a guide rod 542 fixed on its inner side. The guide rod 542 extends into the movable cavity 55, and its end is connected to a roller 545 through a rotating shaft 544. The roller 545 rolls in contact with the outer surface of the conical drive sleeve 56. A first spring 543 is sleeved on the guide rod 542. The two ends of the first spring 543 are fixed to the guide rod 542 and the inner wall of the movable cavity 55, respectively. When the conical drive sleeve 56 moves axially, its inclined surface pushes the roller 545, thereby driving the guide rod 542 and the fan-shaped sliders 541 to move radially outward, thereby changing the curvature of the flattened roller surface. The function of the first spring 543 is to provide radial rebound force to ensure that the fan-shaped sliders 541 can be smoothly retracted when the conical drive sleeve 56 moves in the opposite direction, and to maintain close contact between the roller 545 and the conical drive sleeve 56.

[0024] Specifically, the conical drive sleeve 56 includes a cylindrical section and a conical section connected to one end of the cylindrical section. When the roller 545 contacts the cylindrical section, the outer surfaces of the multiple sets of fan-shaped sliders 541 are flush with the outer surface of the sleeve 53. At this time, the flattening roller surface is in a flat state. When the roller 545 contacts the conical section, the axial movement of the conical drive sleeve 56 pushes the roller 545 and the guide rod 542 through the inclined surface of the conical section, causing the fan-shaped sliders 541 to be pushed outward in the radial direction, thereby making the flattening roller surface arc-shaped.

[0025] To ensure a smooth transition and create a continuous curved surface on the flattening roller, a gap is left between adjacent sets of fan-shaped sliders 541. Adjacent sets of fan-shaped sliders 541 distributed along the axial direction of the roller body 51 are connected by elastic connecting pieces 57. The fan-shaped sliders 541 closest to the sleeve 53 are also connected to the sleeve 53 by elastic connecting pieces 57. The elastic connecting pieces 57 can maintain the integration between the fan-shaped sliders 541. The outer surfaces of the sleeve 53 and multiple sets of fan-shaped sliders 541 are covered with an elastic protective sleeve 58. The elastic protective sleeve 58 can protect the flattening roller surface and further improve the uniformity of the flattening effect.

[0026] Reference Figure 5 , Figures 8-11To drive the conical drive sleeve 56 to slide axially, each set of movable chambers 55 is equipped with an adjustment mechanism 6. Specifically, the adjustment mechanism 6 includes a spindle 61 fixed in the movable chamber 55, a cavity 62 opened in the spindle 61, a hydraulic cylinder 63 installed in the cavity 62, and an elastic reservoir 64 on the outside of the end cap 52. Both the elastic reservoir 64 and the hydraulic cylinder 63 are filled with hydraulic oil. The elastic reservoir 64 is connected to the hydraulic cylinder 63 through a hydraulic pipeline. A piston rod 65 is slidably connected in the hydraulic cylinder 63. A second spring 66 is sleeved on the piston rod 65. The two ends of the second spring 66 are respectively fixed to the piston rod 65 and the inner wall of the hydraulic cylinder 63, providing the restoring force of the piston rod 65. One end of the piston rod 65 extends outward. A connecting block 67 is fixed to the outside of the hydraulic cylinder 63. The connecting block 67 is fixed to the conical drive sleeve 56 via a slide rod 68. The hydraulic oil in the hydraulic cylinder 63 fills the part between the other end of the piston rod 65 and the elastic reservoir 64. When the elastic reservoir 64 is compressed, the hydraulic oil enters the hydraulic cylinder 63 to push the piston rod 65, thereby driving the conical drive sleeve 56 to slide axially. The capacity of the elastic reservoir 64 is greater than the capacity of the hydraulic cylinder 63. Therefore, when the elastic reservoir 64 is compressed, it can increase the stroke of the conical drive sleeve 56 to slide axially. In addition, a limit ring 631 is fixedly connected inside the hydraulic cylinder 63. The other end of the piston rod 65 contacts the limit ring 631 to limit the position of the piston rod 65.

[0027] To ensure the conical drive sleeve 56 remains stable during axial sliding, an axially oriented guide rail 69 is provided on the spindle 61. The slide rod 68 is slidably disposed within the guide rail 69, allowing the conical drive sleeve 56 to slide against the outer surface of the spindle 61. Guided by the guide rail 69, it can slide synchronously towards or in opposite directions along the axial direction of the spindle 61. (Refer to...) Figure 5 and Figure 9 A support sleeve 521 is fixedly installed on the end face of the end cap 52 away from the roller body 51. The support sleeve 521 is sleeved on one side end face of the elastic reservoir 64 to limit and support the elastic reservoir 64, ensuring that it deforms stably when squeezed and effectively transmits hydraulic pressure.

[0028] Reference Figure 12To enable automatic adjustment of the flattening roller unit 5 to adapt to changes in film tension, both ends of the roller body 51 are mounted on the frame 1 via a floating support mechanism 7. Specifically, the floating support mechanism 7 includes a support plate 71, and the ends of the roller body 51 are rotatably connected to the support plate 71 via bearings. A support shaft 72 is connected to the support plate 71, and the support shaft 72 slides through a bushing 73 fixed on the frame 1. The top end of the support shaft 72 passes through the frame 1 and is equipped with a stop. A third spring 74 is sleeved on the support shaft 72, and the two ends of the third spring 74 are fixed to the support plate 71 and the bushing 73, respectively. When the film tension changes, the flattening roller unit 5 will float vertically accordingly. The third spring 74 can provide elastic buffering and ensure that the roller body 51 returns to the equilibrium position. The floating design allows the flattening roller surface to be adjusted according to the actual stress of the film.

[0029] Furthermore, refer to Figures 12-13 The frame 1 is equipped with a compression mechanism 8 corresponding to the elastic reservoir 64. The compression mechanism 8 includes a vertical shaft 81 fixed on the frame 1, a sleeve block 82 slidably sleeved on the vertical shaft 81, and a pressure block 83 fixed at the bottom of the sleeve block 82. The pressure block 83 contacts the elastic reservoir 64 and is used to compress the elastic reservoir 64, so that the hydraulic oil in the elastic reservoir 64 flows into the hydraulic cylinder 63 and compresses the piston rod 65 to drive the conical drive sleeve 56 to slide. A fourth spring 84 is sleeved on the vertical shaft 81, and the two ends of the fourth spring 84 are fixed on the sleeve block 82 and the frame 1, respectively.

[0030] The working principle of the paperboard laminating device for paperboard processing provided by this invention is as follows: When the tension of the film increases, the upward force exerted by the film on the flattening roller unit 5 increases. Under this action, the flattening roller unit 5 floats upward to varying degrees, thereby synchronously driving the support plate 71 to move upward, so that the roller body 51 always maintains a rotational connection with the support plate 71. At the same time, the elastic reservoir 64 moves relative to the frame 1 as the flattening roller unit 5 floats. At this time, the sleeve block 82 in the extrusion mechanism 8 is continuously subjected to a downward elastic force by the fourth spring 84, which acts on the elastic reservoir 64 through the pressure block 83. When the flattening roller unit 5 floats upward, the change in the relative position between the sleeve block 82 and the elastic reservoir 64 allows the extrusion force provided by the fourth spring 84 to effectively act on the elastic reservoir 64, compressing its internal volume, thereby forcing the internal hydraulic oil into the hydraulic cylinder 63 of the adjustment mechanism 6. After the hydraulic oil enters the hydraulic cylinder 63, it pushes the hydraulic cylinder 63. The piston rod 65 inside slides against the resistance of the second spring 66. The movement of the piston rod 65 is transmitted through the connecting block 67 and the slide rod 68, thereby driving the conical drive sleeve 56 to slide along the axial direction of the spindle 61. When the conical drive sleeve 56 slides axially, its conical section will roll into contact with the roller 545. The inclined surface of the conical section pushes the roller 545 and the guide rod 542, causing multiple sets of fan-shaped sliders 541 to overcome the resistance of the first spring 543 and push outward radially. This results in an increase in the curvature of the flattening roller surface formed by the sleeve 53 and the fan-shaped sliders 541, thereby enhancing the flattening force on the film and effectively suppressing the wrinkling phenomenon of the film. Conversely, when the film tension decreases, the flattening roller unit 5 sinks, the extrusion mechanism 8 reduces the extrusion force on the elastic reservoir 64 accordingly, the hydraulic oil flows back under the action of the reset force of the second spring 66, the conical drive sleeve 56 resets, the fan-shaped sliders 541 retract radially, and the curvature of the flattening roller surface decreases, thus realizing the automatic adaptive adjustment of the flattening force.

[0031] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A paperboard laminating apparatus for paperboard processing, comprising a frame (1), a conveying unit (2) disposed on the frame (1) for conveying paperboard, a film feeding roller unit (3) for unwinding film, and a hot pressing laminating unit (4) for pressing the film and paperboard together, characterized in that, Also includes: A flattening roller unit (5) is disposed between the film feeding roller unit (3) and the hot pressing and laminating unit (4) for flattening the film during transport. The flattening roller unit (5) includes a roller body (51), end caps (52) detachably disposed at both ends of the roller body (51), and a sleeve (53) fixedly sleeved on the outer periphery of the roller body (51). Multiple sets of radially sliding adjustment modules (54) are arranged along the axial direction of the roller body (51). The multiple sets of adjustment modules (54) and the sleeve (53) together constitute the flattening roller surface. The roller body (51) has symmetrically opened movable cavities (55) at both ends. Each set of movable cavities (55) is slidably connected to a conical drive sleeve (56). The axial sliding of the conical drive sleeve (56) drives the multiple sets of adjustment modules (54) to generate radial displacement, so that the flattening roller surface switches between a flat state and an arc state.

2. The paperboard laminating apparatus for paperboard processing according to claim 1, characterized in that: Each set of adjustment modules (54) includes multiple sets of fan-shaped sliders (541) equidistantly distributed along the circumference of the roller body (51). Each set of fan-shaped sliders (541) has a guide rod (542) fixed on its inner side. The guide rod (542) extends into the movable cavity (55), and its end is connected to a roller (545) through a rotating shaft (544). The roller (545) rolls in contact with the outer surface of the conical drive sleeve (56). A first spring (543) is sleeved on the guide rod (542). The two ends of the first spring (543) are fixed to the guide rod (542) and the inner wall of the movable cavity (55), respectively.

3. The paperboard laminating apparatus for paperboard processing according to claim 2, characterized in that: The conical drive sleeve (56) includes a cylindrical section and a conical section connected to one end of the cylindrical section; When the roller (545) contacts the cylindrical section, the outer surface of the multiple sets of fan-shaped sliders (541) is flush with the outer surface of the sleeve (53); When the roller (545) contacts the conical section, the axial movement of the conical drive sleeve (56) causes the fan-shaped slider (541) to be pushed out radially through the inclined surface of the conical section.

4. The paperboard laminating apparatus for paperboard processing according to claim 1, characterized in that: Each set of movable cavities (55) is provided with an adjustment mechanism (6). The adjustment mechanism (6) includes a spindle (61) fixed in the movable cavity (55). A cavity (62) is opened in the spindle (61). A hydraulic cylinder (63) is provided in the cavity (62). An elastic reservoir (64) is provided on the outside of the end cap (52). Both the elastic reservoir (64) and the hydraulic cylinder (63) are filled with hydraulic oil. The elastic reservoir (64) and the hydraulic cylinder (63) are connected in a through connection. A piston rod (65) is slidably connected in the hydraulic cylinder (63). A second spring (66) is sleeved on the piston rod (65). The two ends of the second spring (66) are respectively fixed on the piston rod (65) and the inner wall of the hydraulic cylinder (63). One end of the piston rod (65) extends out of the hydraulic cylinder (63) and is fixed with a connecting block (67). The connecting block (67) is fixed to the conical drive sleeve (56) through a slide rod (68).

5. The paperboard laminating apparatus for paperboard processing according to claim 4, characterized in that: The spindle (61) is provided with a guide rail (69), and the slide rod (68) is slidably disposed in the guide rail (69).

6. The paperboard laminating apparatus for paperboard processing according to claim 1, characterized in that: The two ends of the roller (51) are mounted on the frame (1) through a floating support mechanism (7). The floating support mechanism (7) includes a support plate (71). The end of the roller (51) is rotatably connected to the support plate (71) through a bearing. A support shaft (72) is connected to the support plate (71). The support shaft (72) slides through a bushing (73) fixed on the frame (1). A third spring (74) is sleeved on the support shaft (72). The two ends of the third spring (74) are fixed to the support plate (71) and the bushing (73) respectively.

7. The paperboard laminating apparatus for paperboard processing according to claim 4, characterized in that: The frame (1) is provided with a squeezing mechanism (8) corresponding to the elastic reservoir (64). The squeezing mechanism (8) includes a vertical shaft (81) fixed on the frame (1), a sleeve block (82) slidably sleeved on the vertical shaft (81), and a pressure block (83) fixed at the bottom of the sleeve block (82). The pressure block (83) contacts the elastic reservoir (64) and is used to squeeze the elastic reservoir (64). A fourth spring (84) is sleeved on the vertical shaft (81). The two ends of the fourth spring (84) are fixed on the sleeve block (82) and the frame (1) respectively.

8. The paperboard laminating apparatus for paperboard processing according to claim 2, characterized in that: There is a gap between two adjacent sets of the fan-shaped sliders (541). Two adjacent sets of fan-shaped sliders (541) distributed along the axial direction of the roller body (51) are connected by an elastic connecting piece (57). The outer surfaces of the sleeve (53) and the multiple sets of fan-shaped sliders (541) are covered with an elastic protective sleeve (58).

9. The paperboard laminating apparatus for paperboard processing according to claim 4, characterized in that: The end cap (52) is fixedly installed with a support sleeve (521) on the end face away from the roller body (51). The support sleeve (521) is sleeved on one side end face of the elastic reservoir (64) to limit and support the elastic reservoir (64).

10. The paperboard laminating apparatus for paperboard processing according to claim 4, characterized in that: A limiting ring (631) is fixedly connected inside the hydraulic cylinder (63), and the other end of the piston rod (65) is in contact with the limiting ring (631).

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