Paperboard line pressing device

Abstract

The paperboard line pressing device comprises an upper pressing assembly and a lower pressing assembly. The upper pressing assembly comprises rigid upper armor units and an upper base plate, the multiple upper armor units are connected end to end to form an upper armor layer capable of annularly rotating, and the upper armor layer comprises an upper chord section arranged in the moving direction of the paperboard; the rigid upper supporting plate is provided with an upper supporting face which faces downwards and is continuously arranged, the upper supporting face is arranged above the upper chord section and provides continuous support for at least two adjacent upper armor units in the upper chord section, and the upper base plates of the supported upper armor units are combined to form an upper channel wall; the lower pressing assembly comprises rigid lower armor units, each lower armor unit comprises a lower base plate, a plurality of lower armor units are connected end to end to form a lower armor layer capable of annularly rotating, and the lower armor layer comprises a lower chord section arranged in the moving direction of the paperboard; the upper supporting surface of the upper supporting plate and the lower supporting surface of the lower supporting plate are oppositely arranged up and down; unit convex ribs which protrude outwards and are arranged in the paperboard moving direction are arranged in the center area of an upper base plate of the upper armor unit or a lower base plate of the lower armor unit, the front-back adjacent unit convex ribs are connected in a front-back mode to form a convex rib set, the upper channel wall and the lower channel wall are oppositely arranged in the vertical direction, and a paper passing channel is formed between the upper channel wall and the lower channel wall. And the unit convex ribs are used for forming continuous bending marks on the paperboard when the paperboard passes through the paper passing channel.

Description

Technical Field

[0001] The present invention relates to the technical field related to cardboard processing, and in particular to a cardboard pressing device. Background Art

[0002] Cardboard is the most commonly used and essential packaging material. Common cartons are typically made from corrugated cardboard. The typical carton production process is as follows: 1. Cutting: Cutting the cardboard to its proper height while simultaneously pressing out the vertical fold lines; 2. Printing: Printing the cardboard surface with a printing press; 3. Crimping: Using a creasing machine to press out the horizontal fold lines; 4. Slotting: Using a slotting machine to create slots for the lid and bottom; 5. Joining: Stitching the carton together using a stapler or gluer to reshape the carton.

[0003] Among them, the quality of the crimping process affects the joint forming effect of the carton and the compressive strength of the carton. How to improve the quality of crimping is a common problem for every carton manufacturer. The most common crimping process currently uses a combination of upper and lower rollers for rolling crimping. The upper roller and the lower roller are aligned up and down. A circle of ribs is provided on the outer circumference of the upper roller, and the outer circumference of the lower roller is a flat surface. When the cardboard passes through the gap between the upper roller and the lower roller, the ribs on the upper roller roll the cardboard to form a crimping line. This roller crimping process has the following disadvantages: since the upper roller and the lower roller are both small-diameter circular rollers, the contact between the ribs, the lower roller and the cardboard is point contact, the force-bearing area of ​​the cardboard is small, and the cardboard is easily crushed by the ribs when pressed. This results in a low production yield of cartons and increased costs.

[0004] To address the problems of existing crimping processes, improvements have been made to crimping equipment. For example, Chinese invention patent publication number CN107097455A discloses a corrugated cardboard crimping structure comprising a longitudinal upper crimping belt and a longitudinal lower crimping belt. The longitudinal lower crimping belt is provided with a protrusion A. By adopting a top and bottom crimping belt structure, the crimping distance is extended, the force-bearing area of ​​the cardboard being processed is larger, and it is less likely to be crushed. However, this crimping belt structure creates another problem: the crimping belt needs to rotate. Not only is the belt body relatively soft, but the protrusion A provided on the bottom crimping belt also needs to be made of a soft material. Furthermore, the long crimping belt has no support, so the protrusion A does not make a deep enough impression on the cardboard when it passes through, resulting in unclear crimping. This makes it difficult to fold the cardboard during the subsequent joining process, preventing accurate shaping, which affects the squareness and appearance of the carton. Summary of the Invention

[0005] In order to overcome at least one of the above problems existing in the cardboard pressing equipment in the prior art, the present invention proposes a cardboard pressing device, comprising an upper pressing assembly and a lower pressing assembly;

[0006] The upper pressing assembly includes a plurality of rigid upper armor units arranged adjacent to each other in a front-to-back manner. The adjacent upper armor units rotate relative to each other. Each upper armor unit includes an upper base plate. The multiple upper base plates are connected end to end to form an upper armor layer that can rotate in an annular manner. The upper armor layer includes an upper chord segment arranged along the direction of cardboard movement. The upper pressing assembly also includes a rigid upper support plate having a downwardly facing upper support surface. The upper support surface is arranged above the upper chord segment and provides continuous support for at least two adjacent upper armor units in the upper chord segment. The upper base plates of the supported upper armor units are combined to form an upper channel wall.

[0007] The lower pressing assembly includes multiple rigid lower armor units arranged adjacent to each other in a front-to-back manner. The adjacent lower armor units rotate relative to each other. Each lower armor unit includes a lower base plate. Multiple lower base plates are connected end to end to form a circularly rotatable lower armor layer. The lower armor layer includes a lower chord segment arranged along the direction of cardboard movement. The lower pressing assembly also includes a rigid lower support plate having an upward-facing lower support surface. The lower support surface is arranged below the lower chord segment and provides continuous support for at least two adjacent lower armor units in the lower chord segment. The lower base plates of the supported lower armor units are combined to form a lower channel wall.

[0008] The upper supporting surface of the upper supporting plate and the lower supporting surface of the lower supporting plate are arranged opposite to each other in an upper and lower direction;

[0009] A unit convex rib is provided in the central area of ​​the upper base plate of the upper armor unit or the lower base plate of the lower armor unit. The unit convex ribs protrude outward and are arranged along the direction of paperboard movement. The front and rear adjacent unit convex ribs are connected front to back to form a convex rib group. The upper channel wall and the lower channel wall are arranged opposite to each other in the upper and lower directions and form a paper feeding channel therebetween. The unit convex ribs are used to form continuous indentations on the paperboard in the paper feeding channel.

[0010] The upper and lower pressing assemblies are the primary components for creasing the cardboard as it passes through them. They are mounted on the upper and lower support frames, respectively, arranged one above the other. Adjusting the positions of the upper and lower support frames allows for adjustments to the creasing position and depth to suit varying production requirements. The upper pressing assembly comprises a multi-section upper armor unit, while the lower pressing assembly comprises a multi-section lower armor unit. Each section of the upper or lower armor unit is an independent rigid component.

[0011] The upper or lower armor unit is a rigid component that works in contact with the cardboard. To effectively create indentations on the cardboard, the upper armor unit is typically made of a hard metal, such as stainless steel or cast steel, or a hard non-metallic material, such as rigid plastic, that exhibits high structural strength and strong resistance to deformation. Similarly, the rigid upper or lower support plate is typically made of a hard metal, such as stainless steel or cast steel, or a hard non-metallic material, such as rigid plastic, that exhibits high structural strength and strong resistance to deformation.

[0012] To achieve relative rotation between adjacent front and rear upper armor units, upper side panels may be provided on the left and right sides of the upper base plate, respectively. The front and rear adjacent upper armor units can be connected to each other via a hinged structure between the front and rear adjacent upper side panels. Alternatively, the front and rear adjacent upper side panels may be overlapped and hinged on a single axis to achieve relative rotation between the front and rear adjacent upper armor units. Alternatively, the front and rear adjacent upper armor units may be connected to each other via auxiliary connecting plates to achieve relative rotation between the upper side panels. The same structure applies to the relative rotation between the lower armor units.

[0013] In order to reduce damage to the cardboard, the connection between the upper side panel and the upper base panel, as well as the connection between the lower side panel and the lower base panel, is generally provided with a transition fillet. In order to allow the ends of two adjacent upper base panels or two adjacent lower base panels to be smoothly connected, the ends of the upper armor unit or lower armor unit have at least the following two structures: the first structure is a vertical cross-section at both ends, so that the two armor units can be connected together through relative planes; the second structure is a head-to-tail overlap structure, in which one end of the upper base panel or lower base panel is provided with an outwardly protruding overlap edge, and the other end is provided with an inwardly recessed step. When two adjacent upper armor units or lower armor units are connected, the overlap edge can overlap the step of the adjacent upper armor unit or lower armor unit, so that the two adjacent upper base panels or lower base panels are fitted together, and the outer surfaces of the two adjacent upper base panels or lower base panels are flush.

[0014] The upper armor layer refers to an annular cover plate layer composed of multiple sections of the upper base plate connected end to end. Under the support of the upper support plate, the upper base plate with multiple sections connected end to end can form a stable upper channel wall structure on a certain linear path. The lower armor layer refers to an annular cover plate layer composed of multiple sections of the lower base plate connected end to end. Under the support of the lower support plate, the lower base plate with multiple sections connected end to end can form a stable lower channel wall structure on a certain linear path. The upper armor layer can rotate in a circular motion under the drive of the upper driving wheel. Similarly, the lower armor layer can also rotate in a circular motion. This not only drives the cardboard forward, but also presses out indentation lines as the cardboard moves.

[0015] The upper and lower base plates are plate-shaped foundations used to bear pressure. The width of each base plate is greater than the width of the press line (the indentation defined by the process). Positioned on the paper feed path, the upper or lower base plate can fully or partially press against the paperboard along the width of the indentation. This larger press-fit surface enhances the bonding and transmission force. Furthermore, the outer surface of the upper base plate is flexible in shape, typically being a flat surface or a curved surface with a larger diameter, and its surface is smooth.

[0016] The upper support plate is a basic component with good rigidity fixed on the upper support frame. The upper support plate is provided with a continuous long strip plate structure for support. The surface of the plate structure facing downward is the upper support surface. In order to achieve a smooth support effect, the upper support surface is a continuous and smooth surface, and the surface has no protrusions or recesses that hinder the sliding of the upper armor unit. The upper support plate is a component that provides support for the upper armor unit. The connection relationship between the two is at least the following two: the first is that the upper support plate directly supports the upper base plate of the upper armor unit, and the inner side wall surface of the upper base plate of the upper armor unit can slide on the upper support surface; the second is that the upper pressing assembly also includes an upper ring chain, and the upper ring chain includes a rotatable upper roller. The upper ring chain is arranged between the upper support plate and the upper armor layer. The upper roller and the upper support surface are in rolling connection, that is, when the upper ring chain rotates, the upper roller rolls on the upper support surface. The same applies to the lower support plate.

[0017] Among them, the upper supporting surface of the upper supporting plate and the lower supporting surface of the lower supporting plate are arranged relative to each other in the upper and lower directions, which means that the upper supporting surface and the lower supporting surface form a face-to-face positional relationship in the upper and lower directions. In order to form the paper feeding channel, the projections of the two supporting surfaces in the upper and lower directions are at least partially overlapped, and the two supporting surfaces are preferably basically aligned in the upper and lower directions. This enables the upper armor layer and the lower armor layer supported by them to be arranged relative to each other when moving, thereby maximizing the paper feeding channel and maintaining a stable posture.

[0018] According to the above technical solution, compared with the prior art, the beneficial technical effects of the present invention are:

[0019] First, an upper chord section of the upper armor layer forms a stable and rigid upper channel wall under the support of the upper support surface of the upper support plate, and a lower chord section of the lower armor layer forms a stable and rigid lower channel wall under the support of the lower support surface of the lower support plate. Combined with the unit ribs provided on the upper armor unit or the lower armor unit, the paperboard can be pressed by the rigid upper and lower laminates when passing through the paper feeding channel, and a clear pressing line can be pressed by the rib group composed of multiple unit ribs. Because the surface area of ​​the upper and lower channel walls pressed against the paperboard is larger than that of the rollers in the prior art, the paperboard will not be broken due to excessive local pressure, thereby greatly improving the production yield and reducing production costs.

[0020] Second, the upper armor layer is composed of multiple sections of rigid upper base plates connected end to end, and the lower armor layer is composed of multiple sections of rigid lower base plates connected end to end. The upper armor layer and the lower armor layer formed by the combination are annular belt-shaped components. This structure can rotate back and forth under the drive of the driving wheel, which can adapt to the forward movement of the cardboard. However, when there is no limit in the up and down directions, the single-section armor unit will jump up and down; for this purpose, the upper support plate and the lower support plate are increased in rigidity. The upper channel wall formed when the multiple sections of the upper armor units are supported by the upper support plate is also rigid. Similarly, the lower channel wall is also rigid. Through the combination of the rigid upper channel wall and the lower channel wall, a clear pressing line can be pressed on the cardboard. The present invention utilizes the flexibility of the upper armor layer and the lower armor layer to rotate in an annular manner, and combines the rigid support and stable cooperation of the upper armor layer and the lower armor layer, the upper support plate and the lower support plate. The two work together to rotate the paper and improve the pressing line quality.

[0021] A further solution may be that the upper pressing assembly also includes an upper ring chain composed of multiple upper chain links connected end to end, the upper chain link includes an upper roller and an upper roller installed on the upper roller and rotatable, the upper roller is a roller or a bearing, a section of the upper armor unit is connected to the upper ring chain by connecting two upper rollers arranged at intervals, the upper base plate of the upper armor unit is laid on the outside of the upper roller and the upper roller, the upper roller can roll on the upper supporting surface of the upper support plate, the upper supporting surface of the upper support plate can support the upper rollers on at least three of the upper rollers in the upper ring chain, thereby stably supporting the two adjacent sections connected to the three upper rollers Upper armor unit; the lower pressing assembly also includes a lower ring chain composed of multiple lower chain links connected end to end, the lower chain link includes a lower roller and a lower roller installed on the lower roller and rotatable, the lower roller is a roller or a bearing, one section of the lower armor unit is connected to the lower ring chain by connecting two spaced lower rollers, the lower base plate of the lower armor unit is laid on the outside of the lower roller and the lower roller, the lower roller can roll on the lower supporting surface of the lower support plate, the lower supporting surface of the lower support plate can support the lower rollers on at least three of the lower rollers in the lower ring chain, thereby stably supporting the two adjacent sections of the lower armor unit connected to the three lower rollers.

[0022] The upper chain link is the basic component of the upper endless chain and includes at least one upper roller and a rotatable upper roller mounted on the upper roller. To efficiently connect multiple upper chain links to form a continuous chain, each upper chain link includes at least one pair of upper link plates. The upper link plates of two adjacent upper chain links overlap end-to-end and are rotatably connected together via a common upper roller. Taking the upper link plates as an example, there are at least three specific embodiments. First, the upper link plate is a plate-like component independent of the upper armor unit. Two upper link plates, spaced apart on the left and right sides, form a pair. A pair of upper link plates rotatably connects to two adjacent upper rollers. Multiple pairs of upper link plates are connected end-to-end to form an endless belt structure similar to a bicycle chain. Second, the upper armor unit also includes an upper base plate and upper side plates connected to the left and right sides of the upper base plate. The upper side plates, acting as upper link plates, are directly connected to two adjacent upper rollers and overlap end-to-end to form an endless belt structure. The third type is that the upper link plate is a combination of the above two types.

[0023] Among them, the upper supporting surface of the upper support plate supports the upper rollers on at least three of the upper rollers, thereby stably supporting the two adjacent upper armor units connected to the three upper rollers. Two simplest implementation methods are described here. In the first implementation method, although one upper armor unit is connected to two spaced upper rollers, the two adjacent upper armor units may be connected together through a common upper roller, so that the upper rollers on the three upper rollers connected to the two sections of the upper armor units are supported to achieve stability; in the second implementation method, the two adjacent upper armor units are each connected to two upper rollers, and then connected together through a pair of upper chain link plates. At this time, the upper rollers on the four upper rollers connected to the two upper armor units are all supported to achieve stability.

[0024] The upper roller and the lower roller are rollers or bearings, and the two schemes can be selected according to different load conditions. Through the rollers or bearings, rolling transmission between the support surface of the support plate can be achieved.

[0025] The advantages of setting the upper ring chain and the lower ring chain are as follows:

[0026] First, the upper ring chain is provided between the upper armor layer and the upper support plate. The upper roller on the upper ring chain can roll in contact with the upper support surface of the upper support plate, that is, a rolling connection is added between the upper armor layer and the upper support plate, so that the upper armor layer can move back and forth more smoothly along the upper support plate. Similarly, the lower armor layer can also move back and forth smoothly along the lower support plate. This greatly improves the smoothness of the movement of the upper and lower armor layers on the upper and lower support plates, and also greatly increases the service life of the equipment.

[0027] Second, each of the upper armor units or lower armor units is connected to two of the upper rollers or lower rollers. When the upper support plate or lower support plate supports the two upper rollers or lower rollers, the upper armor unit or lower armor unit can be stably supported in a plane and will not swing in the up and down directions. Such a structure is conducive to keeping the upper channel wall and the lower channel wall stable, so as to improve the quality of the line pressing and ensure that the line pressing is straight and the depth is uniform.

[0028] Since the present invention has the above characteristics and advantages, it can be applied to a cardboard pressing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic structural diagram of the cardboard pressing device in a front view direction;

[0030] Figure 2 It is a schematic diagram of the exploded structure of the cardboard pressing device;

[0031] Figure 3 1 is a schematic structural diagram of the upper pressing assembly in a front view;

[0032] Figure 4 is a schematic diagram of the exploded structure of the upper pressing assembly;

[0033] Figure 5 1 is a schematic structural diagram of the lower pressing assembly in a front view;

[0034] Figure 6 1 is a schematic diagram of the exploded structure of the lower pressing assembly;

[0035] Figure 7 1 is a schematic diagram of the axial structure of the upper armor unit and the upper support plate in the connection state, which is a first connection structure;

[0036] Figure 8 is a schematic cross-sectional view of the upper armor unit and the upper support plate, showing a first connection structure;

[0037] Figure 9 is a schematic diagram of the axial structure of the lower armor unit applied to the first connection structure;

[0038] Figure 10 1 is a schematic diagram of the axial structure of the upper armor unit and the upper chain link in the connection state, which is the second connection structure;

[0039] Figure 11 is a schematic cross-sectional view of the upper armor unit and the upper chain link, showing a second connection structure;

[0040] Figure 12 yes Figure 11 Schematic diagram of the cross-sectional structure in the AA direction;

[0041] Figure 13 1 is a schematic diagram of the axial structure of the upper armor unit and the upper chain link in the connection state, which is the third connection structure;

[0042] Figure 14 is a schematic cross-sectional view of the upper armor unit and the upper chain link, showing the third connection structure;

[0043] Figure 15 is a schematic diagram of the axial structure of the upper armor unit used in the third connection structure;

[0044] Figure 16 is a schematic diagram of the axial structure of the upper support plate applied to the third connection structure;

[0045] Figure 17 Schematic diagram of the axial structure of the upper driving wheel, the upper driven wheel and the upper support plate;

[0046] Figure 18 Schematic diagram of the upper driving wheel, the upper driven wheel and the upper support plate in the front view;

[0047] Figure 19 yes Figure 18 Schematic diagram of the cross-sectional structure in the middle BB direction;

[0048] Figure 20 yes Figure 18 Schematic diagram of the cross-section structure in the CC direction;

[0049] Figure 21 It is a schematic structural diagram of the lower driving wheel, the lower driven wheel and the lower support plate in the axial direction. DETAILED DESCRIPTION

[0050] The structure of the cardboard pressing device using the technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0051] Except for those explicitly stated to be equivalent or alternative implementation schemes, the various implementation details disclosed below can be selectively applied or combined in one embodiment even if they have no direct correlation or synergistic relationship in terms of function.

[0052] like Figures 1 to 9 The figure shows a cardboard pressing device, which includes an upper pressing assembly and a lower pressing assembly arranged in an upper and lower spaced relationship and used in conjunction with each other. The upper pressing assembly includes multiple rigid upper armor units 2 arranged adjacent to each other in front and back. The adjacent upper armor units 2 rotate relative to each other. Each upper armor unit 2 includes an upper base plate 21. Multiple upper base plates 21 are connected end to end to form an upper armor layer 20 that can rotate in an annular manner. The upper armor layer 20 includes an upper chord segment 201 arranged along the direction of cardboard movement; and further includes a rigid upper support plate 3. The upper support plate 3 has an upper support surface 31 facing downward. The upper support surface 31 is arranged above the upper chord segment 201 and provides continuous support for at least two adjacent upper armor units 2 in the upper chord segment 201. The upper base plates 21 of the supported upper armor units 2 are combined to form an upper channel wall 202.

[0053] The lower pressing assembly includes multiple sections of rigid lower armor units 5 arranged adjacent to each other in front and back, and the adjacent lower armor units 5 rotate relative to each other. Each section of the lower armor unit 5 includes a lower base plate 51. Multiple sections of the lower base plates 51 are connected end to end to form a lower armor layer 50 that can rotate in an annular manner. The lower armor layer 50 includes a lower chord segment 501 arranged in the direction of cardboard movement; and also includes a rigid lower support plate 6. The lower support plate 6 has a lower support surface 61 facing upward. The lower support surface 61 is arranged below the lower chord segment 501 and provides continuous support for at least two adjacent lower armor units 5 in the lower chord segment 501. The supported multiple The lower base plate 51 of the lower armor unit 5 is combined to form a lower channel wall 502; the upper support surface 31 of the upper support plate 3 and the lower support surface 61 of the lower support plate 6 are arranged opposite to each other in the upper and lower directions; a unit convex rib 7 is provided in the central area of ​​the upper base plate 21 of the upper armor unit 2 or the lower base plate 51 of the lower armor unit 5, which protrudes outward and is arranged along the direction of cardboard movement. Adjacent unit convex ribs 7 are connected front and back to form a rib group 70. The upper channel wall 202 and the lower channel wall 502 are aligned in the upper and lower directions and form a paper feeding channel 100 therebetween. The unit convex rib 7 is used to form a continuous indentation on the cardboard in the paper feeding channel 100.

[0054] The upper and lower pressing assemblies are the primary components for applying creasing (indentation) to the passing cardboard. They are mounted on the upper and lower support frames, respectively, arranged one above the other. By adjusting the positions of the upper and lower support frames, the creasing position and depth can be adjusted to suit different production requirements. Aside from differences in their upper and lower positions and the placement of the unit ribs 7, the upper and lower pressing assemblies are essentially identical in structure. The following detailed description will primarily focus on the structure of the upper pressing assembly as an example.

[0055] like Figures 1 to 4 As shown, the upper pressing assembly includes an upper driving wheel 81, an upper driven wheel 82, and an upper drive motor 83. The upper armor layer 20 is connected to the upper driving wheel 81 and the upper driven wheel 82, forming a runway-like ring. The upper drive motor 83 can drive the upper driving wheel 81 to rotate, thereby driving the upper armor layer 20 to rotate. The upper chord segment 201 refers to a physical length of the annular upper armor layer 20 located at the lower side near the lower pressing assembly. The physical length of the upper chord segment 201 includes both the upper armor unit 2 and possibly the upper chain link 1.

[0056] The upper armor unit 2 is a rigid, outermost component of the upper pressing assembly, and is the component that contacts the cardboard. To effectively create an indentation on the cardboard, the upper armor unit 2 is typically constructed from materials with high structural strength and strong deformation resistance, such as hard metals (e.g., stainless steel, cast steel, aluminum alloy, copper alloy, etc.) or non-metallic hard plastics (e.g., POM, PBT, PA, etc.). Furthermore, the lower armor unit 5 and upper and lower support plates 3 and 6 are also rigid components, typically constructed from materials with high structural strength and strong deformation resistance, such as hard metals (e.g., stainless steel, cast steel, aluminum alloy, copper alloy, etc.) or non-metallic hard plastics (e.g., POM, PBT, PA, etc.).

[0057] The upper armor unit 2 includes an upper base plate 21 and upper side plates 22 connected to the left and right sides of the upper base plate 21. The connection between the upper side plates 22 and the upper base plate 21 is generally provided with a transition fillet. Similarly, the lower armor unit 5 includes a lower base plate 51 and lower side plates 52 connected to the left and right sides of the lower base plate 51.

[0058] The upper armor layer 20 is a cover layer composed of multiple sections of upper base plates 21 that are connected and connected end to end by relative rotation. In order to allow the end to end of two adjacent armor units to be connected as close as possible, the end and end of the upper base plates 21 have at least the following two structures: the first structure, the end and end of the upper armor unit 2 are both vertical sections, so that the two adjacent upper armor units 2 can be connected together through relative planes; the second structure is a head-to-tail overlapping structure, one end of the upper base plate 21 is provided with an outwardly protruding overlapping edge 23, and the other end is provided with an inwardly recessed step 24. When two adjacent sections of the upper armor units 2 are connected, the overlapping edge 23 can overlap the step 24 of the adjacent upper armor units 2, so that the two adjacent sections of the upper base plates 21 are fit together, and the outer surfaces of the two adjacent sections of the upper base plates 21 are flush.

[0059] The upper support plate 3 is a rigid base component fixed on the upper support frame. The upper support plate 3 is provided with a continuous long plate-shaped structure for support. The surface of the plate-shaped structure facing downward is the upper support surface 31. In order to achieve a smooth support effect, the upper support surface 31 is a continuous and smooth surface without any protrusions or depressions that hinder sliding.

[0060] The connection method between the upper armor unit 2 and the upper support plate 3 is described below with reference to several specific embodiments.

[0061] The first embodiment is a basic application implementation method. Figures 7 to 9As shown, the upper support plate 3 is a component that supports the upper armor unit 2, and the upper armor layer 20 and the upper support plate 3 are in a directly connected structural relationship, that is, the upper support surface 31 of the upper support plate 3 can be directly pressed on the inner side surface of the upper base plate 21 of the upper armor unit 2, and the two are slidably connected, and the upper support surface 31 can simultaneously support at least two sections of the upper armor unit 2, but according to needs, the upper support surface 31 can also simultaneously support, for example, 2 sections, 3 sections, 4 sections, 5 sections or more than ten sections of the upper armor unit 2, as long as the length of the upper support surface 31 and the length of the upper chord segment 201 are changed accordingly, so that a section of the upper chord segment 201 of the upper armor layer 20 is supported on the upper support surface 31 of the upper support plate 3. The upper channel wall 202 is supported to form a stable and rigid upper channel wall 202; similarly, a lower chord section 501 of the lower armor layer 50 forms a stable and rigid lower channel wall 502 under the support of the lower support surface 61 of the lower support plate 6. Combined with the unit ribs 7 provided on the upper base plate 21 or the lower base plate 51, the cardboard can be clamped and pressed by the rigid upper channel wall 202 and the lower channel wall 502 when passing through the paper feeding channel 100, and a clear indentation is pressed by the rib group 70 composed of multiple unit ribs 7. Since the surface area of ​​the upper channel wall 202 and the lower channel wall 502 pressed on the cardboard is large, the cardboard will not be broken due to excessive local pressure, thereby greatly improving the production yield and reducing the production cost.

[0062] In this embodiment, the upper armor unit 2 also includes upper side plates 22 connected to the left and right sides of the upper base plate 21. The upper side plates 22 of two adjacent upper armor units 2 can be directly rotated and hinged together or connected together through external connecting plates. In addition, the upper base plate 21 and the upper side plates 22 on the left and right sides are combined to form a groove structure (i.e., defining the upper roller cavity mentioned below). In this way, the upper armor unit 2 can be connected to the upper support plate 3 through the groove structure to limit the left and right movement (rocking) of the upper armor unit 2, which is beneficial to improving the left and right stability of the upper channel wall 202. The upper armor layer 20 is composed of multiple sections of rigid upper base plates 21 of the upper armor unit 2 connected end to end, and the lower armor layer 50 is composed of multiple sections of rigid lower base plates 51 of the lower armor unit 5 connected end to end. The upper armor layer 20 and the lower armor layer 50 formed by the combination are annular belt-shaped components as a whole, similar to steel tracks. This structure can bend and rotate back and forth under the drive of the driving wheel, and can well adapt to the forward movement of the cardboard; since the upper armor unit 2, the lower armor unit 5, the upper support plate 3 and the lower support plate 6 are all rigid components, the upper channel wall 202 and the lower channel wall 502 used to press the cardboard are also rigid. By combining the two rigid upper channel walls 202 and the lower channel wall 502 with the rib group 70, a clear pressing line can be pressed on the cardboard. The present invention utilizes the flexibility of the upper armor layer 20 and the lower armor layer 50 that can rotate in an annular manner and combines with the rigidity of the upper support plate 3 and the lower support plate 6 to achieve paper feeding and improve the pressing line quality.

[0063] The second embodiment, such as Figures 1 to 6 as well as Figures 10 to 12As shown, as an improvement of the first basic embodiment, the upper pressing assembly also includes an upper ring chain 10 composed of multiple upper chain links 1 connected end to end, the upper chain link 1 includes an upper roller 11 and an upper roller 12 mounted on the upper roller 11 and rotatable, wherein the upper roller 12 is a roller or a bearing, and a section of the upper armor unit 2 is connected to the upper ring chain 10 by connecting two spaced upper rollers 11, and the upper base plate 21 of the upper armor unit 2 is laid on the outside of the upper roller 11 and the upper roller 12, and the upper ring chain 10 is connected to the upper driving wheel 81 and the upper driven wheel 82, and when the upper driving wheel 81 rotates, it can drive the upper armor layer 20 to rotate. The upper roller 12 can roll on the upper support surface 31 of the upper support plate 3, and the upper support surface 31 of the upper support plate 3 can support the upper rollers 12 on at least three of the upper rollers 11 in the upper ring chain 10, thereby stably supporting the two adjacent sections of the upper armor units 2 connected to the three upper rollers 11. Similarly, the lower pressing assembly also includes a lower circular chain 40 composed of multiple lower chain links 4 connected end to end, and the lower chain link 4 includes a lower roller 41 and a lower roller 42 installed on the lower roller 41 and capable of rotating, wherein the lower roller 42 is a roller or a bearing, and a section of the lower armor unit 5 is connected to the lower circular chain 40 by connecting two spaced lower rollers 41, and the lower base plate 51 of the lower armor unit 5 is laid on the outside of the lower roller 41 and the lower roller 42, and the lower roller 42 can roll on the lower support surface 61 of the lower support plate 6, and the lower support surface 61 of the lower support plate 6 can support the lower rollers 42 on at least three of the lower rollers 41 in the lower circular chain 40, thereby stably supporting the two adjacent lower armor units 5 connected to the three lower rollers 41.

[0064] The upper chain link 1 is the basic component of the upper endless chain 10. Each upper chain link 1 includes at least one upper roller 11 and a rotatable upper roller 12 mounted on the upper roller 11. To enable multiple upper chain links 1 to be connected to form a continuous chain, each upper chain link 1 also includes at least one pair of upper chain link plates 13. The upper chain link plates 13 of two adjacent upper chain links 1 are overlapped end to end and rotatably connected (hinged) together via a common upper roller 11. There are at least three specific embodiments of the upper chain link 1. First, the upper chain link plate 13 is a plate-like member independent of the upper armor unit 2. Two upper chain link plates 13 spaced apart form a pair. A pair of upper chain link plates 13 is rotatably connected to two adjacent upper rollers 11. Multiple pairs of upper chain link plates 13 are overlapped end to end and connected to form an endless belt structure similar to a bicycle chain. The second method is that the upper armor unit 2 includes an upper base plate 21 and upper side plates 22 connected to the left and right sides of the upper base plate 21. The upper side plates 22 directly serve as upper link plates 13 to connect two adjacent upper rollers 11. The upper armor unit 2 is connected to the upper rollers 11 through the upper side plates 22, and then the upper rollers 11 are connected end to end to form an annular belt structure. The upper base plate 21 and the upper side plates 22 define an upper roller cavity 25, and at least part of the upper rollers 12 are arranged in the upper roller cavity 25. The third method is as follows: Figure 10 As shown, it is a combination of the above two methods. The upper side plate 22 of the upper armor unit 2 is directly used to connect the upper link plate 13. At the same time, an auxiliary upper link plate 131 is provided between the outer sides (or inner sides) of the front and rear upper side plates 22 for overlapping connection. At this time, an independent upper link plate 13 can also be provided on the outer side (or inner side) of the upper side plate 22 to strengthen the connection strength of the front and rear upper rollers 11 (the upper link plate 13 and the auxiliary upper link plate 131 here are provided for the purpose of explanation only and do not need to be identified. In fact, they are the same component). The upper ring chain 10 is disposed between the upper armor layer 20 and the upper support plate 3. The upper rollers 12 on the upper ring chain 10 are capable of rolling against the upper support surface 31 of the upper support plate 3, thereby forming a rolling connection between the upper armor layer 20 and the upper support plate 3, allowing the upper armor layer 20 to move back and forth more smoothly along the upper support plate 3. Similarly, a similar mating structure is provided between the lower chain link 4 and the lower armor unit 5, allowing the lower armor layer 50 to move back and forth smoothly along the lower support plate 6. In this embodiment, the upper armor layer 20 is supported by one upper ring chain 10, and the lower armor layer 50 is supported by one lower ring chain 40. This greatly improves the smoothness of the movement of the upper armor layer 20 and the lower armor layer 50 on the upper support plate 3 and the lower support plate 6, while also greatly increasing the service life of the equipment.

[0065] The upper support surface 31 of the upper support plate 3 supports the upper rollers 12 on at least three of the upper rollers 11, thereby stably supporting the two adjacent upper armor units 2 connected to the three upper rollers 11. Generally speaking, one upper armor unit 2 is connected to two spaced upper rollers 11, and supporting two upper armor units 2 should support four upper rollers 11. As for the understanding of supporting only three upper rollers 11, the following two simplest implementations are described. The first implementation is as follows. Figure 14 As shown, two adjacent upper armor units 2 are connected together by sharing one upper roller 11, so that the two upper armor units 2 are only connected to three upper rollers 11. At this time, only the upper rollers 12 on the three upper rollers 11 can be supported to stably support the two adjacent upper armor units 2 connected thereto; another embodiment, as shown Figure 11 As shown, two adjacent upper armor units 2 are each connected to two upper rollers 11, and then overlapped and connected together via a pair of auxiliary upper chain link plates 131. At this point, the upper rollers 12 on the four upper rollers 11 connected to the two upper armor units are all supported to achieve stability. The upper armor units 2 and lower armor units 5 can remain stable under the support of the upper support surfaces 31 and lower support surfaces 61 without any vertical bouncing. This structure ensures that the upper channel wall 202 and the lower channel wall 502 remain stable, which is beneficial for improving the quality of the line pressing, ensuring that the line pressing is overall straight and has a uniform depth.

[0066] The third embodiment, such as Figures 13 to 16 As shown, the upper base plate 21 and the upper side plate 22 define an upper roller cavity 25, and the upper armor unit 2 also includes an upper partition plate 26. The upper partition plate 26 is arranged between the two upper side plates 22 to separate the upper roller cavity 25 into two upper secondary roller cavities 251 arranged in parallel. The upper rollers 12 are respectively provided in the two upper secondary roller cavities 251. Two raised upper guide rails 31 are provided on the lower end surface of the upper support plate 3. The upper rollers 12 in the two upper secondary roller cavities 251 can move along one of the upper guide rails 31 respectively. In this embodiment, it is equivalent to supporting the upper armor layer 20 by providing two upper ring chains 10. The double support structure can further improve the stability of the movement of the upper armor unit 2, which is conducive to improving the line pressing effect. Of course, in actual applications, more upper ring chains 10 can be provided for support according to width requirements, and are not limited to the quantity limit in this embodiment.

[0067] The upper armor unit 2 is connected to the upper rollers 11 through the two upper side plates 22 and is connected to the upper ring chain 10. However, the upper support plate 3 with a double support structure is used in conjunction with the two upper ring chains 10. As an improvement, Figure 15 As shown, the upper armor unit 2 can be considered to be composed of two small armor units connected to either side of the upper partition 26. These small armor units are staggered, with each small armor unit being half the overall length of the upper armor unit 2 in the first and second embodiments. Each small armor unit is connected to only one upper roller 11, while the upper partition 26 is connected to both upper rollers 11. This arrangement shortens the length of a single small armor unit, thereby doubling the number of connected upper armor units 2 and creating a more tightly connected structure for the upper armor layer 20. In particular, when the upper armor layer 20 moves around the upper driving wheel 81, the opening angle between two adjacent upper armor layers 20 is reduced by half, which helps improve the rotational flexibility of the upper armor layer 20 and reduces damage to the cardboard.

[0068] A further technical solution may be that the unit ribs 7 may be arranged on the upper armor unit 2 or the lower armor unit 5 according to production needs. In one embodiment, the side of the cardboard with the pattern printed on it is the face paper, and the other side is the back paper. The indentation is generally pressed on one side of the back paper. In order to reduce the friction between the face paper and the conveyor belt, the cardboard is generally conveyed with the face paper facing up and the back paper facing down. In this case, the unit ribs 7 are arranged on the lower armor unit 5, and multiple lower base plates 51 of the lower armor unit 5 supported by the lower support surface 61 are combined to form a lower channel wall 502. At this time, multiple sections of the unit ribs 7 form a rib group 70 arranged in a straight line or with a certain arc along the lower support surface 61. The width and height of the unit ribs 7 are adjusted and set according to actual production requirements.

[0069] A further technical solution may also be: Figure 1 、 Figure 3 and Figure 5As shown, the gap between the upper support plate 3 and the lower support plate 6 gradually decreases in the forward direction, forming a trumpet-shaped pattern, thereby forming a trumpet-shaped pattern in the paper passage 100 formed between the upper channel wall 202 and the lower channel wall 502. Furthermore, the upper support surface 31 of the upper support plate 3 and / or the lower support surface 61 of the lower support plate 6 form an arc-shaped transition, and the gap between the upper support plate 3 and the lower support plate 6 is divided into a front gap and a rear gap at the closest point. The front gap gradually decreases in the forward direction of the paperboard, forming a trumpet-shaped pattern, while the rear gap gradually increases in the forward direction of the paperboard, forming a trumpet-shaped pattern. Furthermore, in the forward direction of the paperboard, the length of the front gap is greater than the length of the rear gap. The advantage of setting a trumpet shape in the forward direction is that it facilitates the entry of the cardboard, and on the other hand, it allows the cardboard's pressing depth to vary from shallow to deep, and the relatively long pressing path can further reduce the risk of the cardboard being crushed. In addition, the gap in the rear exit direction is also set to a trumpet shape to reduce the gap caused by the swinging of the upper armor unit 2 or the lower armor unit 5 when separating from the upper support plate 3 or the lower support plate 6, which may cause unnecessary damage to the cardboard, thereby improving the integrity of the cardboard surface. Of course, further, a straight section can be added in the middle of the arc-shaped support surface of the upper support plate 3 or the lower support plate 6 to enhance the pressing effect.

[0070] The upper pressing assembly also includes an upper tensioning pulley (not shown), which is arranged between the upper driving pulley 81 and the upper driven pulley 82 and presses against the upper endless chain 10 or the upper armor layer 20. Of course, another tensioning structure is also available, in which the upper support frame is provided with a strip-shaped hole, and the driven pulley 82 is connected to the strip-shaped hole. By adjusting the front-to-back position of the driven pulley 82, the upper endless chain 10 or the upper armor layer 20 can be tensioned.

[0071] like Figures 17 to 21The figure shows an improved structure of the upper driving wheel 81, the upper driven wheel 82 and the upper support plate 3. The upper driving wheel 81 and the upper driven wheel 82 are gears. The upper driving wheel 81 is provided with a plurality of upper driving wheel teeth 811. The upper driving wheel 81 rotates with the upper roller 12 through the upper driving wheel teeth 811. The movement trajectory of the upper roller 12 toward the vertex on one side of the central axis of the upper driving wheel 81 forms the first minimum rotation trajectory circle K1 of the upper roller 12; the upper driven wheel 82 is provided with a plurality of upper driven wheel teeth 821. The upper driven wheel 82 rotates with the upper roller 12 through the upper driven wheel teeth 821. 2 rotates, the movement trajectory of the upper roller 12 toward the vertex on one side of the central axis of the upper driven wheel 82 forms the second minimum rotation trajectory circle K2 of the upper roller 12; the end portions of the upper support plate 3 extend to the sides of the upper driving gear teeth 811 and the upper driven gear teeth 821 respectively, and along the axial direction of the upper driving wheel 81 and the upper driven wheel 82, the upper support surfaces 31 of the end portions of the upper support plate 3 are respectively arranged tangent to the first minimum rotation trajectory circle K1 and the second minimum rotation trajectory circle K2 of the upper roller 12; the lower driving wheel The wheel 84 and the lower driven wheel 85 are gears. The lower driving wheel 84 is provided with a plurality of lower driving gear teeth 841. The lower driving wheel 84 rotates with the lower roller 42 through the lower driving gear teeth 841. The movement trajectory of the lower roller 42 toward the vertex on one side of the central axis of the lower driving wheel 84 forms the third minimum rotation trajectory circle K3 of the lower roller 42 (not shown in the figure); the lower driven wheel 85 is provided with a plurality of lower driven gear teeth 851. The lower driven wheel 85 rotates with the lower roller 42 through the lower driven gear teeth 851. The movement trajectory of the lower roller 42 toward the vertex on one side of the central axis of the lower driven wheel 85 forms the fourth minimum rotation trajectory circle K4 of the lower roller 42 (not shown in the figure); the end portions of the lower support plate 6 extend to the sides of the lower driving wheel teeth 841 and the lower driven wheel teeth 851 respectively, and when viewed along the axial direction of the lower driving wheel 84 and the lower driven wheel 85, the lower supporting surfaces 61 at the end portions of the lower support plate 6 are respectively arranged tangent to the third minimum rotation trajectory circle K3 and the fourth minimum rotation trajectory circle K4 of the lower roller 42.

[0072] like Figure 18As shown, the upper support surface 31 of the upper support plate 3 is arranged tangentially to the first minimum rotation trajectory circle K1 and the second minimum rotation trajectory circle K2 of the upper roller 12. This ensures that the upper support surface 31 of the upper support plate 3 can stably support the movement of the upper roller 12 and allow the upper roller 12 to slide smoothly between the teeth of the upper driving wheel 81 or the upper driven wheel 82. The entire movement trajectory of the upper roller 12 is stably supported and smooth. This greatly reduces the jitter of the upper roller 12 during movement between the support plate and the gear, thereby reducing the noise generated by the impact during the rotation of the upper ring chain 10. More importantly, it improves the movement stability of the upper armor unit 2. Similarly, the lower roller 42 can also achieve smooth rolling, effectively controlling the noise generated by the impact during the rotation of the lower ring chain 40, improving the movement stability of the lower armor unit 5 and the unit rib 7, and better ensuring that the cardboard forms a continuous and uniform indentation.

[0073] Furthermore, the first minimum rotation trajectory circle K1 is concentric with the pitch circle K5 of the upper driving wheel 81, and the center line of the upper roller 12 rotated by the upper driving wheel teeth 811 falls on the pitch circle of the upper driving wheel 81; the second minimum rotation trajectory circle K2 is concentric with the pitch circle K6 of the upper driven wheel 82, and the center line of the upper roller 12 rotated by the upper driven wheel teeth 821 falls on the pitch circle of the upper driven wheel 82; the third minimum rotation trajectory circle K3 is concentric with the pitch circle of the lower driving wheel 84, and the center line of the lower roller 42 rotated by the lower driving wheel teeth 841 falls on the pitch circle of the lower driven wheel 85; the fourth minimum rotation trajectory circle K4 is concentric with the pitch circle of the lower driven wheel 85, and the center line of the lower roller 42 rotated by the lower driven wheel teeth 851 falls on the pitch circle of the lower driven wheel 85.

[0074] Furthermore, the upper pressing assembly also includes an upper auxiliary support plate 3', which is arranged above the upper support plate 3 and has an upper auxiliary support surface 31' facing upward. The upper auxiliary support surface 31' is used to provide support for the upper roller 12 of the upper ring chain 10, and the ends of the upper auxiliary support plate 3' extend to the sides of the upper driving gear teeth 811 and the upper driven gear teeth 821 respectively. The upper auxiliary support surfaces 31' at the ends of the upper auxiliary support plate 3' are respectively aligned with the first minimum rotation trajectory circle K1 and the second minimum rotation trajectory circle K2 of the upper roller 12. The lower pressing assembly also includes a lower auxiliary support plate 6', which is arranged below the lower support plate 6 and has a lower auxiliary support surface 61' facing downward. The lower auxiliary support surface 61' is used to provide support for the lower roller 42 of the lower ring chain. The ends of the lower auxiliary support plate 6' extend to the sides of the lower driving gear teeth 841 and the lower driven gear teeth 851 respectively. The lower auxiliary support surfaces 61' at the ends of the lower auxiliary support plate 6' are arranged tangentially to the third minimum rotation trajectory circle K3 and the fourth minimum rotation trajectory circle K4 of the lower roller 42 respectively. By providing upper and lower supports for the upper ring chain 10, the noise generated by the impact when the upper ring chain 10 rotates can be further reduced.

[0075] Furthermore, the upper auxiliary support plate 3' includes an upper fixed block 32', an upper movable block 33' and an upper elastic connecting member 34', the upper fixed block 32' is provided with an upper pit 35' on the upward side, the upper movable block 33' is movably provided in the upper pit 35', the upper elastic connecting member 34' is provided between the upper fixed block 32' and the upper movable block 33', the upper movable block 33' can move up and down under the action of the upper elastic connecting member 34', the upper surface of the upper movable block 33' protrudes higher than the upper surface of the upper fixed block 32' or smoothly transitions to the upper surface of the upper fixed block 32' to form the upper auxiliary supporting surface 31'. Similarly, the lower auxiliary support plate 6' includes a lower fixed block (not shown in the figure), a lower movable block (not shown in the figure) and a lower elastic connecting member (not shown in the figure). The lower fixed block is provided with a lower pit (not shown in the figure) on the downward side, and the lower movable block is movably arranged in the lower pit. The lower elastic connecting member is arranged between the lower fixed block and the lower movable block. The lower movable block can move up and down under the action of the lower elastic connecting member. The lower surface of the lower movable block protrudes higher than the lower surface of the lower fixed block or smoothly transitions to the lower surface of the lower fixed block to form the lower supporting surface. Furthermore, the upper surface of the upper movable block 33' is configured to be an arc with a high center and low sides. Thus, when the upper ring chain 10 rotates, the upper roller 12 only contacts the upper surface of the central protrusion of the upper movable block 33', and does not contact the connection points at both ends of the upper movable block 33'. Similarly, the lower surface of the lower movable block is configured to be an arc with a high center and low sides. The lower roller 42 on the lower ring chain 40 also only contacts the upper surface of the central protrusion of the lower fixed block. By configuring the upper movable block 33' and the lower movable block, the upper ring chain 10 and the lower ring chain 40 can be lifted on the side not in line, thereby tensioning the chain, which is beneficial for improving the stability of the chain during rotation and reducing the vibration of the rollers.

[0076] Furthermore, the two end portions of the upper support plate 3 are respectively provided with an upper left insertion portion 32 and an upper right insertion portion 33, the upper left insertion portion 32 is radially inserted into the side or middle groove of the upper driving gear tooth 811 to form a stacked arrangement, and the upper right insertion portion 33 is radially inserted into the side or middle groove of the upper driven gear tooth 821 to form a stacked arrangement, wherein the width of the upper left insertion portion 32 and the upper right insertion portion 33 is smaller than the width of the middle portion of the upper support plate 3, and the sum of the widths of the upper left insertion portion 32 and the upper driving gear tooth 811 or the sum of the widths of the upper right insertion portion 33 and the upper driven gear tooth 821 is smaller than the length of the upper roller 12. The lower support plate 6 is provided with a lower left insertion portion 62 and a lower right insertion portion 63 at both ends, respectively. The lower left insertion portion 62 is radially inserted into the side or middle groove of the lower driving gear teeth 841 to form a stacked arrangement, and the lower right insertion portion 63 is radially inserted into the side or middle groove of the lower driven gear teeth 851 to form a stacked arrangement. The widths of the lower left insertion portion 62 and the lower right insertion portion 63 are smaller than the width of the middle portion of the lower support plate 6. The sum of the widths of the lower left insertion portion 62 and the lower driving gear teeth 841 or the sum of the widths of the lower right insertion portion 63 and the lower driven gear teeth 851 is smaller than the length of the upper roller 42. In order to control the length of the upper roller 12 and the lower roller 42, the thickness of the upper driving gear teeth 811, the upper driven gear teeth 821, the lower driving gear teeth 841, and the lower driven gear teeth 851 can be changed, for example, by reducing part of the material on one side of the gear teeth or reducing part of the material in the middle of the gear teeth to form a middle groove structure.

Claims

1. A cardboard pressing device, comprising an upper pressing assembly and a lower pressing assembly; characterized in that: The upper pressing assembly includes a plurality of rigid upper armor units arranged adjacent to each other in a front-to-back manner. The adjacent upper armor units rotate relative to each other. Each upper armor unit includes an upper base plate. The multiple upper base plates are connected end to end to form an upper armor layer that can rotate in an annular manner. The upper armor layer includes an upper chord segment arranged along the direction of cardboard movement. The upper pressing assembly also includes a rigid upper support plate having a downwardly facing upper support surface. The upper support surface is arranged above the upper chord segment and provides continuous support for at least two adjacent upper armor units in the upper chord segment. The upper base plates of the supported upper armor units are combined to form an upper channel wall. The lower pressing assembly includes multiple rigid lower armor units arranged adjacent to each other in a front-to-back manner. The adjacent lower armor units rotate relative to each other. Each lower armor unit includes a lower base plate. Multiple lower base plates are connected end to end to form a circularly rotatable lower armor layer. The lower armor layer includes a lower chord segment arranged along the direction of cardboard movement. The lower pressing assembly also includes a rigid lower support plate having an upward-facing lower support surface. The lower support surface is arranged below the lower chord segment and provides continuous support for at least two adjacent lower armor units in the lower chord segment. The lower base plates of the supported lower armor units are combined to form a lower channel wall. The upper supporting surface of the upper supporting plate and the lower supporting surface of the lower supporting plate are arranged opposite to each other in an upper and lower direction; A unit convex rib is provided in the central area of ​​the upper base plate or the lower base plate, protruding outward and arranged along the direction of paperboard movement. The front and rear adjacent unit convex ribs are connected to form a convex rib group. The upper channel wall and the lower channel wall are arranged opposite to each other in the upper and lower directions and form a paper feeding channel therebetween. The unit convex rib is used to form a continuous indentation on the paperboard in the paper feeding channel.

2. The cardboard pressing device according to claim 1, characterized in that: The upper pressing assembly also includes an upper endless chain composed of multiple upper chain links connected end to end, the upper chain link includes an upper roller and an upper roller mounted on the upper roller and rotatable, the upper roller is a roller or a bearing, one section of the upper armor unit is connected to the upper endless chain by connecting two upper rollers arranged at intervals, the upper base plate of the upper armor unit is laid on the outer sides of the upper roller and the upper roller, the upper roller can roll on the upper supporting surface of the upper support plate, the upper supporting surface of the upper support plate can support the upper rollers on at least three of the upper rollers in the upper endless chain, thereby stably supporting the two adjacent sections of the upper armor unit connected to the three upper rollers; The lower pressing assembly also includes a lower ring chain composed of multiple lower chain links connected end to end, the lower chain link includes a lower roller and a lower roller installed on the lower roller and rotatable, the lower roller is a roller or a bearing, a section of the lower armor unit is connected to the lower ring chain by connecting two spaced lower rollers, the lower base plate of the lower armor unit is laid on the outside of the lower roller and the lower roller, the lower roller can roll on the lower supporting surface of the lower support plate, the lower supporting surface of the lower support plate can support the lower rollers on at least three of the lower rollers in the lower ring chain, thereby stably supporting the two adjacent lower armor units connected to the three sections of the lower rollers.

3. The cardboard pressing device according to claim 1 or 2, characterized in that: The gap between the upper support plate and the lower support plate gradually becomes smaller in the advancing direction of the paperboard and becomes trumpet-shaped, so that the paper feeding channel formed between the upper channel wall and the lower channel wall also becomes trumpet-shaped.

4. The cardboard pressing device according to claim 3, characterized in that: The upper supporting surface of the upper supporting plate and / or the lower supporting surface of the lower supporting plate are arc-shaped, and the gap between the upper supporting plate and the lower supporting plate is divided into a front gap and a rear gap at the closest point, wherein the front gap gradually becomes smaller and becomes a trumpet shape in the direction of the cardboard moving forward, and the rear gap gradually becomes larger and becomes a trumpet shape in the direction of the cardboard moving forward.

5. The cardboard pressing device according to claim 4, characterized in that: In the advancing direction of the cardboard, the length of the front gap is greater than the length of the rear gap.

6. The cardboard pressing device according to claim 1 or 2, characterized in that: One end of the upper base plate and the lower base plate is provided with an outwardly protruding overlapping edge, and the other end is provided with an inwardly recessed step. When two adjacent upper armor units or lower armor units are connected, the overlapping edge can overlap the step of the adjacent upper armor unit or lower armor unit, so that the two adjacent upper base plates or lower base plates are fit together and connected together, and the outer surfaces of the two adjacent upper base plates or lower base plates are flush.

7. The cardboard pressing device according to claim 2, characterized in that: The upper armor unit also includes upper side plates connected to the left and right sides of the upper base plate, the upper base plate and the upper side plates define an upper roller cavity, the upper armor unit is connected to the upper roller through the upper side plates, and at least part of the upper roller is arranged in the upper roller cavity; the lower armor unit also includes lower side plates connected to the left and right sides of the lower base plate, the lower base plate and the lower side plates define a lower roller cavity, the lower armor unit is connected to the lower roller through the lower side plates, and at least part of the lower roller is arranged in the lower roller cavity.

8. The cardboard pressing device according to claim 7, characterized in that: The upper armor unit also includes an upper partition, which is arranged between the two upper side plates to separate the upper roller cavity into two upper secondary roller cavities arranged in parallel, and the upper rollers are respectively provided in the two upper secondary roller cavities, and two upper guide rails protruding downward are provided on the upper support plate, and the lower surfaces of the upper guide rails are the upper supporting surfaces, and the upper rollers in the two upper secondary roller cavities can respectively move along one of the upper guide rails; the lower armor unit also includes a lower partition, which is arranged between the two lower side plates to separate the lower roller cavity into two lower secondary roller cavities arranged in parallel, and the lower rollers are respectively provided in the two lower secondary roller cavities, and two lower guide rails protruding upward are provided on the lower support plate, and the upper surfaces of the lower guide rails are the lower supporting surfaces, and the lower rollers in the two lower secondary roller cavities can respectively move along one of the lower guide rails.

9. The cardboard creasing device according to claim 2, characterized in that: The upper pressing assembly also includes an upper driving wheel, an upper driven wheel and an upper driving motor, the upper annular chain is connected to the upper driving wheel and the upper driven wheel, and the upper driving motor can drive the upper driving wheel to rotate, thereby rotating the upper annular chain and the upper armor layer; the lower pressing assembly also includes a lower driving wheel, a lower driven wheel and a lower driving motor, the lower annular chain is connected to the lower driving wheel and the lower driven wheel, and the lower driving motor can drive the lower driving wheel to rotate, thereby rotating the lower annular chain and the lower armor layer.

10. The cardboard pressing device according to claim 9, characterized in that: The upper pressing assembly also includes an upper tensioning wheel, which is arranged between the upper driving wheel and the upper driven wheel and is tightly pressed on the upper annular chain or the upper armor layer; the lower pressing assembly also includes a lower tensioning wheel, which is arranged between the lower driving wheel and the lower driven wheel and is tightly pressed on the lower annular chain or the lower armor layer.

11. The cardboard pressing device according to claim 9, characterized in that: The upper driving wheel and the upper driven wheel are gears, and the upper driving wheel is provided with a plurality of upper driving wheel teeth, and the upper driving wheel drives the upper roller to rotate through the upper driving wheel teeth, and the movement trajectory of the upper roller toward the vertex on one side of the central axis of the upper driving wheel forms a first minimum rotation trajectory circle of the upper roller; the upper driven wheel is provided with a plurality of upper driven wheel teeth, and the upper driven wheel drives the upper roller to rotate through the upper driven wheel teeth, and the movement trajectory of the upper roller toward the vertex on one side of the central axis of the upper driven wheel forms a second minimum rotation trajectory circle of the upper roller; the two end portions of the upper support plate respectively extend to the side edges of the upper driving wheel teeth and the upper driven wheel teeth, and the upper supporting surfaces of the two end portions of the upper support plate are respectively arranged tangent to the first minimum rotation trajectory circle and the second minimum rotation trajectory circle of the upper roller; The lower driving wheel and the lower driven wheel are gears, the lower driving wheel is provided with a plurality of lower driving wheel teeth, the lower driving wheel drives the lower roller to rotate through the lower driving wheel teeth, and the movement trajectory of the lower roller toward the vertex on one side of the central axis of the lower driving wheel forms a third minimum rotation trajectory circle of the lower roller; the lower driven wheel is provided with a plurality of lower driven wheel teeth, the lower driven wheel drives the lower roller to rotate through the lower driven wheel teeth, and the movement trajectory of the lower roller toward the vertex on one side of the central axis of the lower driven wheel forms a fourth minimum rotation trajectory circle of the lower roller; the two end portions of the lower support plate respectively extend to the side edges of the lower driving wheel teeth and the lower driven wheel teeth, and the lower supporting surfaces of the two end portions of the lower support plate are respectively arranged tangent to the third minimum rotation trajectory circle and the fourth minimum rotation trajectory circle of the lower roller.

12. The cardboard pressing device according to claim 11, characterized in that: The first minimum rotation trajectory circle is concentric with the pitch circle of the upper driving wheel, and the center line of the upper roller rotated by the upper driving wheel teeth falls on the pitch circle of the upper driving wheel; the second minimum rotation trajectory circle is concentric with the pitch circle of the upper driven wheel, and the center line of the upper roller rotated by the upper driven wheel teeth falls on the pitch circle of the upper driven wheel; the third minimum rotation trajectory circle is concentric with the pitch circle of the lower driving wheel, and the center line of the lower roller rotated by the lower driving wheel teeth falls on the pitch circle of the lower driven wheel; the fourth minimum rotation trajectory circle is concentric with the pitch circle of the lower driven wheel, and the center line of the lower roller rotated by the lower driven wheel teeth falls on the pitch circle of the lower driven wheel.

13. The cardboard pressing device according to claim 11, characterized in that: The axle up and down groove at two ends embeds respectively in two guide rails up and down of being made up of the groove on the attachment piece, and the tooth on the attachment piece is meshed with tooth on upper sprocket wheel, the lower sprocket.

14. The cardboard pressing device according to claim 13, characterized in that: The upper auxiliary support plate includes an upper fixed block, an upper movable block and an upper elastic connecting piece, the upper fixed block is provided with an upper pit on the upper side, the upper movable block is movably provided in the upper pit, the upper elastic connecting piece is provided between the upper fixed block and the upper movable block, the upper movable block can move up and down under the action of the upper elastic connecting piece, the upper surface of the upper movable block protrudes higher than the upper surface of the upper fixed block or smoothly transitions to the upper surface of the upper fixed block to form the upper auxiliary supporting surface.

15. The cardboard pressing device according to claim 13, characterized in that: The lower auxiliary support plate includes a lower fixed block, a lower movable block and a lower elastic connecting piece, the lower fixed block is provided with a lower pit on the downward side, the lower movable block is movably arranged in the lower pit, the lower elastic connecting piece is arranged between the lower fixed block and the lower movable block, and the lower movable block can move up and down under the action of the lower elastic connecting piece, so that the lower surface of the lower movable block protrudes higher than the lower surface of the lower fixed block or smoothly transitions to the lower surface of the lower fixed block to form the lower auxiliary supporting surface.

16. The cardboard creasing device according to any one of claims 11 to 15, characterized in that: An upper left insertion portion and an upper right insertion portion are respectively provided at both end portions of the upper support plate, the upper left insertion portion radially extending into the side edge or middle groove of the upper driving gear teeth and forming a stacked arrangement, and the upper left insertion portion radially extending into the side edge or middle groove of the upper driven gear teeth and forming a stacked arrangement, wherein the widths of the upper left insertion portion and the upper right insertion portion are smaller than the width of the middle portion of the upper support plate, and the sum of the widths of the upper left insertion portion and the upper driving gear teeth or the sum of the widths of the upper right insertion portion and the upper driven gear teeth is smaller than the length of the upper roller; The two end portions of the lower support plate are respectively provided with a lower left insertion portion and a lower right insertion portion, the lower left insertion portion extends radially into the side edge or the middle groove of the lower driving gear teeth and forms a stacked arrangement, and the lower left insertion portion extends radially into the side edge or the middle groove of the lower driven gear teeth and forms a stacked arrangement, wherein the width of the lower left insertion portion and the lower right insertion portion is smaller than the width of the middle portion of the lower support plate, and the sum of the width of the lower left insertion portion and the lower driving gear teeth or the sum of the width of the lower right insertion portion and the lower driven gear teeth is smaller than the length of the upper roller.

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