A cardboard box anti-collapse indentation device based on gradient elastic top block

Abstract

This invention relates to the field of cardboard production and processing technology, and discloses a cardboard anti-collapse creasing device based on gradient elastic top blocks. It includes a frame with a receiving plate on the right side. Multiple rectangularly evenly distributed drive shafts are rotatably mounted on the inner walls of both the front and rear ends of the frame. Multiple matching grooves are pre-set on the outer walls of the drive shafts. Each pair of corresponding left and right drive shafts has sleeve plates fitted onto their front and rear ends. Pressure rollers are symmetrically slidably fitted onto the outer walls of the upper and lower drive shafts on the left side. This cardboard anti-collapse creasing device based on gradient elastic top blocks effectively solves the problems in existing technologies: top blocks with excessive hardness apply uniform and excessive support force to the entire cardboard area, while top blocks with insufficient hardness provide insufficient support; and top blocks with a single hardness require extremely precise adjustment of the creasing pressure to achieve a barely acceptable creasing effect, resulting in a low tolerance for error.

Description

Technical Field

[0001] This invention relates to the field of cardboard production and processing technology, specifically to a cardboard anti-collapse and indentation device based on a gradient elastic top block. Background Technology

[0002] Cardboard, as a core substrate in the packaging industry, is widely used in fields with extremely stringent requirements for surface flatness, such as electronic products, high-end gift boxes, and precision medical instruments. The creasing process is a crucial step in cardboard box forming, and its quality directly determines the stiffness of the final box's edges and its overall anti-collapse performance. Practice shows that excessively deep creasing lines causing collapse significantly weaken the box's compressive strength and lead to irreversible deformation of the printed patterns, severely impacting product quality and performance. Existing creasing technologies are mainly divided into two categories: rigid creasing rollers force formation through the convex and concave structure of the upper and lower rollers, which easily leads to cardboard fiber breakage; and elastic top block assisted die-cutting, which uses homogeneous polyurethane / rubber top blocks below the die to provide cushioning, reducing fiber damage but failing to solve the micro-scale collapse problem of thin white cardboard.

[0003] To address this issue, this application designs a cardboard anti-collapse creasing device based on gradient elastic top blocks. In existing cardboard creasing machines, the top blocks are mostly made of hard materials or homogeneous elastomers. Top blocks with excessive hardness apply uniform and excessive support force to the entire cardboard area, which can lead to over-compression of the area near the creasing line, core layer crushing, and obvious collapse, severely weakening the strength of the cardboard. Top blocks with insufficient hardness provide insufficient support, and the cardboard lacks sufficient reaction force to form clear, full, and deep creasing lines, resulting in subsequent folding difficulties, inaccuracies, crease bursting, or rebound after folding. In addition, to achieve a barely acceptable creasing effect with a single hardness top block, the creasing pressure needs to be adjusted extremely precisely, resulting in a low tolerance for error. Even slight machine vibrations or minor fluctuations in cardboard thickness can lead to batch collapses or poor creasing. Summary of the Invention

[0004] To address the aforementioned shortcomings of existing technologies, this invention provides a cardboard anti-collapse creasing device based on gradient elastic top blocks. This effectively solves the problems in existing technologies where top blocks with excessively high hardness apply uniform and excessive support force to the entire cardboard area, leading to over-compression and core layer collapse near the creasing line, resulting in obvious collapse. Conversely, top blocks with insufficient hardness provide inadequate support, leaving insufficient reaction force beneath the cardboard to form clear, full, and deep creasing lines. Furthermore, achieving a barely acceptable creasing effect with a single-hardness top block requires extremely precise adjustment of the creasing pressure, resulting in a low tolerance for error.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0006] This invention provides a cardboard anti-collapse and indentation device based on gradient elastic top blocks, comprising:

[0007] The frame on the right has a receiving plate. Multiple rectangular drive shafts are installed on the inner walls of the front and rear ends of the frame. Multiple matching grooves are pre-set on the outer walls of the drive shafts. Each pair of left and right drive shafts is fitted with a sleeve plate that rotates together at both ends. Pressure rollers are symmetrically slidably fitted on the outer walls of the upper and lower drive shafts on the left side. Conveyor rollers that are slidably fitted on the pressure rollers are installed at both ends of the pressure rollers. The frame is equipped with an adjustment part, and multiple pressure rollers are equipped with an indentation part.

[0008] The adjustment unit includes a bidirectional lead screw that is rotatably installed on the inner walls of the front and rear ends of the frame. Connecting plates are symmetrically slidably sleeved on the outer walls of the two upper left and right drive shafts. Multiple adjustment plates are slidably sleeved on the outer walls of the two lower left and right drive shafts. Extension plates are installed on the opposite ends of the two lower front and rear adjustment plates.

[0009] The indentation section includes pre-pressing ring cutters fixedly sleeved on the outer walls of multiple pressure rollers on the left side, pre-pressing groups on multiple pressure rollers on the left side, main pressing ring cutters fixedly sleeved on the outer walls of two pressure rollers on the upper right side, and main pressing groups on two pressure rollers on the lower right side.

[0010] Furthermore, the pre-compression assembly includes elastic bushings located on both the front and rear sides of the pre-compression ring cutter. The elastic bushings on both the front and rear sides are fixedly sleeved on the pressure roller, and a pressure relief groove is opened on the outer wall of the pressure roller corresponding to the two elastic bushings.

[0011] Furthermore, the main pressure assembly includes a rigid bushing fixedly fitted on the outer wall of the pressure roller. The outer wall of the rigid bushing is provided with multiple sets of dense small protrusions evenly distributed in a circle. Flexible bushings are fixedly fitted on both the front and rear sides of the rigid bushing on the outer wall of the pressure roller. The outer wall of the flexible bushing is provided with multiple sets of sparse large protrusions evenly distributed in a circle. Pressure relief grooves are provided on the outer wall of the pressure roller corresponding to the two flexible bushings. Multiple magnetic sliding plates evenly distributed in a circle are slidably installed on the inner wall of the pressure relief grooves via compression springs. The multiple magnetic sliding plates on the front and rear sides are symmetrically arranged.

[0012] Furthermore, the opposite ends of the front and rear connecting plates are rotatably connected to the corresponding conveying rollers. Connecting slide rods are symmetrically installed on the upper part of the connecting plates. A support plate is provided on the upper side of the connecting plates through a threaded sleeve on a bidirectional lead screw. Both the left and right connecting slide rods slide through the support plate.

[0013] Furthermore, multiple adjusting plates are rotatably connected to the corresponding conveying rollers. The frontmost and rearmost adjusting plates are equipped with docking slide plates corresponding to the right conveying rollers. Strong magnets are embedded on the lower sides of the opposite ends of the front and rear docking slide plates. An annular groove is opened on the lower right side of the conveying roller corresponding to the adjusting plate, facing the docking slide plate. The docking slide plate is slidably connected to the inner wall of the corresponding annular groove.

[0014] Furthermore, clearance grooves are provided on the inner walls of both the front and rear ends of the frame. A baffle is installed on the end of the extension plate facing the clearance groove. An installation groove is provided on the upper end of the baffle. An auxiliary pressure plate is slidably connected to the inner wall of the installation groove by a compression spring. Sliding holes are symmetrically provided on the upper end of the baffle. A support slide rod with its lower end connected to the baffle by a compression spring is slidably installed in the sliding hole. A positioning plate is installed on the upper end of the two support slide rods. A cover plate is installed on the end of the positioning plate facing the corresponding adjustment plate.

[0015] Furthermore, each of the upper and lower sleeve plates is equipped with an adjusting screw that is fixedly connected to the frame via a bearing seat. The upper side of the adjusting screw is threaded to the sleeve plate, and the lower side of the adjusting screw rotates through the lower sleeve plate.

[0016] Furthermore, the inner walls at both ends of the frame are provided with waist-shaped sliding holes corresponding to the upper left and right drive shafts. The upper left and right drive shafts are slidably connected to the inner walls of the corresponding waist-shaped sliding holes at their respective ends, and the rear ends of the upper and lower left and right drive shafts are connected by synchronous belts.

[0017] The technical solution provided by this invention has the following advantages compared with the prior art:

[0018] This invention provides a cardboard anti-collapse creasing device based on a gradient elastic top block. When the cardboard is pre-crimped, the creasing line deforms and collapses under pressure, simultaneously squeezing the corresponding left and right elastic bushings. This causes the corresponding areas to elastically compensate and sink into the corresponding pressure relief grooves, thereby achieving pressure relief compensation for the left and right sides of the creasing line. It also avoids the problem of a single top block with excessive hardness applying uniform and excessive support force to the entire cardboard area, which would cause excessive compression and core layer crushing of the left and right sides of the creasing line, resulting in obvious collapse and severely weakening the strength of the cardboard box.

[0019] When the cardboard is creasing, the creasing line will deform and collapse under pressure, simultaneously squeezing the corresponding left and right flexible bushings. This causes the corresponding areas to elastically compensate and sink into the corresponding pressure relief grooves, thus achieving pressure relief compensation on both sides of the creasing line. It also avoids the problem of insufficient support from a top block with too low hardness, resulting in insufficient reaction force under the cardboard to form a clear, full, and deep creasing line, which would lead to difficulties, inaccuracies, crease bursting, or rebound after folding.

[0020] When adjusting the left and right spacing of the pressure rollers, the external drive controls the two bidirectional lead screws to rotate in opposite directions, causing the corresponding connecting plates to move closer or further apart. The front and rear connecting plates will then drive the corresponding pressure rollers to move closer or further apart via the corresponding conveyor rollers. This allows for convenient and precise adjustment of the left and right spacing of the pressure rollers through the bidirectional lead screws. When adjusting the up and down spacing of the pressure rollers, the external drive controls the two adjusting lead screws to rotate in opposite directions, causing the two upper left and right drive shafts to slide up or down along the waist-shaped sliding holes. This allows for convenient and precise adjustment of the up and down spacing of the pressure rollers through the adjusting lead screws. Combined with the flexible compensation of the elastic and rigid bushings, this avoids the problem that a single hardness top block can only achieve a barely acceptable indentation effect. The spacing adjustment tolerance is low, and slight machine vibrations or minor fluctuations in cardboard thickness can lead to batch collapses or poor indentation. Attached Figure Description

[0021] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0022] Figure 1 This is a schematic diagram of the three-dimensional structure in an embodiment of the present invention;

[0023] Figure 2 This is a three-dimensional structural diagram of the adjustment part and the indentation part in an embodiment of the present invention;

[0024] Figure 3 This is a three-dimensional structural diagram of the sleeve, adjusting screw, and indentation part in an embodiment of the present invention;

[0025] Figure 4 This is a three-dimensional structural diagram of the adjustment part in an embodiment of the present invention;

[0026] Figure 5 This is a three-dimensional structural diagram of the drive shaft, sleeve, baffle, and positioning plate in an embodiment of the present invention;

[0027] Figure 6This is a schematic diagram of the three-dimensional separation of the adjustment part in an embodiment of the present invention;

[0028] Figure 7 This is a schematic diagram of the three-dimensional separation of the drive shaft, preload ring cutter, and preload assembly in an embodiment of the present invention;

[0029] Figure 8 This is a schematic diagram of the three-dimensional separation of the drive shaft, main pressure ring cutter, and main pressure assembly in an embodiment of the present invention;

[0030] Figure 9 This is a schematic diagram of a three-dimensional partial cross-section of the main pressure ring cutter and the main pressure assembly in an embodiment of the present invention.

[0031] The labels in the diagram represent: 1. Frame; 2. Receiving plate; 3. Drive shaft; 4. Sleeve plate; 41. Adjusting screw; 5. Pressure roller; 6. Conveying roller; 7. Adjusting section; 71. Bidirectional screw; 72. Connecting plate; 721. Connecting slide rod; 722. Support plate; 73. Adjusting plate; 731. Docking slide plate; 732. Strong magnet; 74. Extension plate; 741. Baffle; 742. Auxiliary pressure plate; 743. Support slide rod; 744. Positioning plate; 745. Cover plate; 8. Indentation section; 81. Pre-pressure ring cutter; 82. Pre-pressure group; 821. Elastic bushing; 822. Pressure relief groove one; 83. Main pressure ring cutter; 84. Main pressure group; 841. Rigid bushing; 842. Flexible bushing; 843. Pressure relief groove two; 844. Magnetic slide plate. Detailed Implementation

[0032] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0033] The present invention will be further described below with reference to embodiments.

[0034] Example:

[0035] Please see Figures 1-9 This invention provides a technical solution: a cardboard anti-collapse and indentation device based on gradient elastic top blocks, comprising:

[0036] The frame 1 on the right side has a receiving plate 2. Multiple rectangular drive shafts 3 are installed on the inner walls of the front and rear ends of the frame 1. Multiple matching grooves are pre-set on the outer walls of the drive shafts 3. Each pair of left and right drive shafts 3 are fitted with sleeve plates 4. Pressure rollers 5 are symmetrically slidably fitted on the outer walls of the upper and lower drive shafts 3 on the left side. Conveyor rollers 6 are installed on the front and rear ends of the pressure rollers 5. An adjustment part 7 is provided on the frame 1. Indentation parts 8 are provided on the multiple pressure rollers 5.

[0037] The adjustment unit 7 includes a bidirectional lead screw 71 that is rotatably installed on the inner walls of the front and rear ends of the frame 1. The two threaded sections on the bidirectional lead screw 71 rotate in opposite directions. The upper left and right transmission shafts 3 are symmetrically fitted with connecting plates 72 on their outer walls. The lower left and right transmission shafts 3 are fitted with multiple adjustment plates 73 on their outer walls. The two lower front and rear adjustment plates 73 are each fitted with an extension plate 74 at their opposite ends. The adjustment plates 73 and the extension plates 74 are integrated into one unit.

[0038] The indentation section 8 includes pre-pressing ring cutters 81 that are fixedly sleeved on the outer walls of multiple left-side pressure rollers 5, pre-pressing groups 82 that are provided on the multiple left-side pressure rollers 5, main pressing ring cutters 83 that are fixedly sleeved on the outer walls of the two upper right pressure rollers 5, and main pressing groups 84 that are provided on the two lower right pressure rollers 5.

[0039] The pre-compression assembly 82 includes elastic bushings 821 located on both the front and rear sides of the pre-compression ring cutter 81. The elastic bushings 821 on both the front and rear sides are fixedly sleeved on the pressure roller 5. Pressure relief grooves 822 are opened on the outer wall of the pressure roller 5 corresponding to the two elastic bushings 821. The pressure relief grooves 822 are arc-shaped.

[0040] The main pressure assembly 84 includes a rigid bushing 841 fixedly sleeved on the outer wall of the pressure roller 5. The outer wall of the rigid bushing 841 is provided with multiple sets of dense small protrusions evenly distributed in a circle. Flexible bushings 842 are fixedly sleeved on both the front and rear sides of the rigid bushing 841 on the outer wall of the pressure roller 5. The outer wall of the flexible bushing 842 is provided with multiple sets of sparse large protrusions evenly distributed in a circle. Pressure relief grooves 843 are provided on the outer wall of the pressure roller 5 corresponding to the two flexible bushings 842. The pressure relief grooves 843 are annular. Multiple magnetic sliding plates 844 are slidably installed on the inner wall of the pressure relief grooves 843 by compression springs. The multiple magnetic sliding plates 844 on the front and rear sides are symmetrically arranged.

[0041] The opposite ends of the front and rear connecting plates 72 are rotatably connected to the corresponding conveying rollers 6. Connecting slide rods 721 are symmetrically installed on the upper end of the connecting plate 72. A support plate 722 is provided on the upper side of the connecting plate 72 through a threaded sleeve on the bidirectional lead screw 71. Both the left and right connecting slide rods 721 slide through the support plate 722.

[0042] Multiple adjusting plates 73 are rotatably connected to the corresponding conveying rollers 6. The frontmost and rearmost adjusting plates 73 are equipped with docking slide plates 731 on the opposite ends of the right conveying rollers 6. Strong magnets 732 are embedded on the lower side of the opposite ends of the front and rear docking slide plates 731. An annular groove is opened on the lower right side of the conveying rollers 6 corresponding to the adjusting plates 73, facing the docking slide plate 731. The docking slide plate 731 is slidably connected to the inner wall of the corresponding annular groove.

[0043] Both ends of the frame 1 have clearance grooves on their inner walls. An extension plate 74 is fitted with a baffle 741 at the end facing the clearance groove. An installation groove is provided at the upper end of the baffle 741. An auxiliary pressure plate 742 is slidably connected to the inner wall of the installation groove by a compression spring. The upper end of the baffle 741 has symmetrical sliding holes on the left and right. A support slide rod 743 is slidably installed in the sliding holes and its lower end is connected to the baffle 741 by a compression spring. A positioning plate 744 is installed on the upper end of the two support slide rods 743. A cover plate 745 is installed at the end of the positioning plate 744 facing the corresponding adjustment plate 73.

[0044] Each of the upper and lower sleeve plates 4 is provided with an adjusting screw 41 that is fixedly connected to the frame 1 via a bearing seat. The upper side of the adjusting screw 41 is threaded to the sleeve plate 4, and the lower side of the adjusting screw 41 rotates through the lower sleeve plate 4.

[0045] The inner walls at both ends of the frame 1 are provided with waist-shaped sliding holes corresponding to the upper left and right drive shafts 3. The upper left and right drive shafts 3 are slidably connected to the inner walls of the corresponding waist-shaped sliding holes at their respective ends, and the rear ends of the upper and lower left and right drive shafts 3 are connected by synchronous belts.

[0046] In practice:

[0047] First, the adjustment part 7 and the creasing part 8 in this application work together to precisely adjust the horizontal and vertical spacing of multiple pressure rollers 5 on the upper and lower sides when creasing the cardboard, effectively increasing the creasing error tolerance. The cardboard is then pre-crimped and the main creasing is performed sequentially. During this process, the elastic bushing 821 and the flexible bushing 842 can both relieve pressure on the cardboard to prevent the area near the creasing line from being over-compressed, the core layer from being crushed, and the formation of obvious collapse, which would seriously weaken the strength of the cardboard box and prevent the cardboard from lacking sufficient reaction force to form a clear, full, and deep creasing line.

[0048] It should be noted that, under the action of the compression spring, the positioning plate 744 will always drive the cover plate 745 to move upward until the inner wall of the two semi-circular gaps at the upper end of the positioning plate 744 is attached to the outer wall of the two upper left and right drive shafts 3. Similarly, under the action of the compression spring, the auxiliary pressure plate 742 initially extends out of the mounting groove and moves closer to the cover plate 745, and the multiple magnetic sliding plates 844 on the left and right sides of the same pressure roller 5 will also move closer to each other under the action of the compression spring. At this time, the corresponding flexible bushing 842 is in a flat state.

[0049] When pre-crimping the cardboard, it should be noted that the main purpose of pre-crimping is to lay the foundation for accurate positioning of the subsequent main creasing. The pressure of pre-crimping is usually less than that of the main creasing. When the cardboard passes through multiple pre-crimping rings 81 on the upper and lower sides, the multiple pre-crimping rings 81 will pre-crimp the cardboard. During this process, because the cardboard is squeezed by the two rigid pre-crimping rings 81, the areas on the left and right sides of the creasing line will be subjected to greater compressive force, which may lead to problems such as stress deformation and collapse. The corresponding areas of the two elastic bushings 821 on the left and right sides of the pressure roller 5 will be respectively... The areas on the left and right sides of the cardboard crease line correspond to each other. At this time, the cardboard crease line will deform and collapse under the force, and at the same time squeeze the corresponding left and right elastic bushings 821, so that the corresponding parts of the cardboard will be elastically compensated and sink into the corresponding pressure relief grooves 822. This achieves the effect of pressure relief compensation for the left and right sides of the cardboard crease line. It can also avoid the problem of a single top block with excessive hardness applying uniform and excessive support force to the entire cardboard area, which would cause the parts of the cardboard crease line on the left and right sides to be over-compressed, the core layer to be crushed, and obvious collapse, which would seriously weaken the strength of the cardboard box.

[0050] As the drive shaft 3 drives the corresponding pressure roller 5 to rotate, the elastic bushings 821 on the multiple pressure rollers 5 on the left side will rotate accordingly. When the left and right elastic bushings 821 are squeezed into the corresponding pressure relief groove 822 and are separated from the pre-indentation area of ​​the upper and lower pre-pressure ring blades 81, the squeezed areas of the left and right elastic bushings 821 will be restored from the deformed state to the flat state under the action of their own elastic deformation. This achieves the effect of effectively contacting the left and right sides of the cardboard indentation line and releasing pressure again when contacting the cardboard again.

[0051] During the main indentation of the cardboard, as the cardboard passes through the upper main pressure ring knife 83 and the lower rigid bushing 841 and flexible bushing 842, the upper main pressure ring knife 83 will perform the main indentation on the cardboard. Since the main indentation requires greater pressure to fully form the cardboard, the rigid bushing 841 is used instead of the lower rigid mold to avoid excessive pressure or stress concentration during rigid-to-rigid contact, which could cause the cardboard to crack. The rigid bushing 841 is fixedly fitted onto the corresponding pressure roller 5, providing buffering and uniform support for the indentation area. During this process, the upper main pressure ring knife 83 and the lower rigid bushing 841 together compress the cardboard to form the final indentation line. The areas on the left and right sides of the indentation line will be subjected to greater compressive force, which may lead to deformation and collapse. The corresponding areas of the two flexible bushings 842 on the pressure roller 5 will correspond to the left and right sides of the indentation line on the cardboard. When the cardboard is subjected to force, it will deform and collapse, simultaneously squeezing the corresponding left and right flexible bushings 842. This causes the corresponding areas to elastically compensate and sink into the corresponding pressure relief grooves 843. At this time, the deformed areas of the left and right flexible bushings 842 will squeeze the corresponding magnetic sliding plates 844, causing them to slide away from the corresponding rigid bushings 841. This achieves the effect of pressure relief compensation on both sides of the cardboard's crease line. It also avoids the problem that the top block with too low hardness provides insufficient support, resulting in insufficient reaction force under the cardboard to form a clear, full, and deep crease line, which would lead to difficulties in subsequent folding, inaccuracies, crease bursting, or rebound after folding. It should be noted that when the cardboard forms the final crease line and continues to be conveyed to the right to complete the entire crease work, it finally slides onto the receiving plate 2 and is uniformly received and processed by the external receiving equipment.

[0052] As the drive shaft 3 drives the corresponding pressure roller 5 to rotate, the flexible bushings 842 on the two front and rear pressure rollers 5 on the lower right side will rotate accordingly. When the two flexible bushings 842 are squeezed and fall into the corresponding pressure relief groove 843, they will separate from the main pressure ring cutter 83 and the main pressure mark area of ​​the rigid bushing 841. It should be noted that, since the pressure relief groove 843 on the pressure roller 5 in the main pressure mark area is a ring design, unlike the pressure relief groove 822 on the pressure roller 5 in the pre-pressure mark area which is an arc design, the intermittently opened pressure relief groove 822 can provide some assistance for the elastic deformation and reset of the corresponding elastic bushing 821. Moreover, the pressure of the pre-pressure mark is inherently less than the pressure of the main pressure mark, and during this period, the elastic bushing 821 can provide some assistance for the elastic deformation and reset of the corresponding elastic bushing 821. The elastic compensation of the flexible bushing 821, which is embedded in the corresponding pressure relief groove 822, has a smaller degree of deformation and is easier to reset. On the contrary, after the two flexible bushings 842 are subjected to pressure, the elastic compensation of the flexible bushings 842, which are embedded in the corresponding pressure relief groove 843, has a larger degree of deformation. The pressure relief groove 843 cannot provide any assistance to the reset of the flexible bushings 842. At this time, the several magnetic sliding plates 844 corresponding to the pressure relief groove 843 will slowly slide towards the side of the corresponding rigid bushing 841 under the action of the compression spring. This can provide some assistance to the process of the compressed part of the two flexible bushings 842 gradually recovering from the deformed state to the flat state under the action of its own elastic deformation.

[0053] If the compressed areas of the two flexible bushings 842 cannot fully recover to a flat state under their own elastic deformation, when the deformed areas of the two flexible bushings 842 rotate with the corresponding pressure roller 5 to the position corresponding to the strong magnet 732, it should be noted that the magnetism of the multiple magnetic sliding plates 844 is repulsive to the magnetism of the strong magnet 732. The corresponding magnetic sliding plates 844 will slide further towards the side of the corresponding rigid bushing 841 under the force of magnetic repulsion, thereby pushing the corresponding flexible bushing 842 to recover from the deformed state to a flat state. This achieves the effect of effectively contacting the left and right sides of the crease line of the cardboard and releasing pressure again when it contacts the cardboard again.

[0054] When adjusting the left and right distance of the pressure roller 5, the external drive controls the two bidirectional lead screws 71 to rotate in opposite directions. The two bidirectional lead screws 71 will drive the corresponding support plates 722 to move closer or further apart. The two support plates 722 will, through the corresponding connecting slides 721, jointly drive the corresponding connecting plates 72 to move closer or further apart. The two connecting plates 72 will, through the corresponding conveyor rollers 6, drive the corresponding pressure rollers 5 to move closer or further apart. Thus, the bidirectional lead screws 71 can conveniently and precisely adjust the left and right distance of the pressure roller 5. When adjusting the up and down distance of the pressure roller 5, the external drive controls the two adjusting lead screws 41 to rotate in opposite directions. The two adjusting lead screws 41 will drive the corresponding upper support plates 722 to move closer or further apart. The sleeve plate 4 moves up or down, and the two sleeve plates 4 located on the upper side together drive the two upper left and right transmission shafts 3 to slide up or down along the waist-shaped sliding hole. Thus, by adjusting the screw 41, the vertical spacing of the pressure roller 5 can be precisely adjusted. With the flexible compensation of the elastic bushing 821 and the rigid bushing 841, the problem of low tolerance for spacing adjustment when a single hard top block is used to obtain a barely acceptable creasing effect can be avoided. Slight machine vibration or slight fluctuations in paperboard thickness can lead to batch collapse or poor creasing. In addition, the dense small bumps on the rigid bushing 841 and the sparse large bumps on the flexible bushing 842 are a gradient design, which not only provides a support gradient for the paperboard, but also guides the flow of paperboard fibers during the creasing process, reducing friction and scratches on the paperboard.

[0055] In summary, this application has the following advantages:

[0056] Firstly, when pre-crimping the cardboard, the corresponding areas of the two elastic bushings 821 on the left and right sides of the cardboard crease line will correspond to the left and right sides of the crease line. At this time, the crease line will deform and collapse under the force, and simultaneously squeeze the corresponding two elastic bushings 821, causing the corresponding areas to elastically compensate and sink into the corresponding pressure relief grooves 822. This achieves the effect of pressure relief compensation for the left and right sides of the crease line, and also avoids the problem of a single, excessively hard top block applying uniform and excessive support force to the entire cardboard area, which would cause the left and right sides of the crease line to be over-compressed, the core layer to be crushed, and obvious collapse to form, seriously weakening the strength of the cardboard box.

[0057] Secondly, as the drive shaft 3 drives the corresponding pressure roller 5 to rotate, the elastic bushings 821 on the multiple pressure rollers 5 on the left side will rotate accordingly. When the left and right elastic bushings 821 are squeezed into the corresponding pressure relief groove 822 and are separated from the pre-indentation area of ​​the upper and lower pre-pressure ring knives 81, the squeezed areas of the left and right elastic bushings 821 will be restored from the deformed state to the flat state under the action of their own elastic deformation. This achieves the effect of effectively contacting the left and right sides of the cardboard indentation line and releasing pressure again when contacting the cardboard again.

[0058] Thirdly, when the cardboard is creasing, the creasing line will deform and collapse under pressure, simultaneously squeezing the corresponding left and right flexible bushings 842. This causes the corresponding areas to elastically compensate and sink into the corresponding pressure relief grooves 843, thereby achieving the effect of pressure relief compensation on both sides of the cardboard creasing line. It also avoids the problem that the top block with too low hardness provides insufficient support, and the cardboard lacks sufficient reaction force to form a clear, full, and deep creasing line, which leads to subsequent difficulties in folding, inaccuracy, cracking, or rebound after folding.

[0059] Fourthly, as the drive shaft 3 drives the corresponding pressure roller 5 to rotate, when the two flexible bushings 842 are squeezed and fall into the corresponding pressure relief groove 843, and are separated from the main pressure mark area of ​​the corresponding main pressure ring cutter 83 and rigid bushing 841, the corresponding magnetic slide plates 844 in the pressure relief groove 843 will slowly slide towards the side closer to the corresponding rigid bushing 841 under the action of the compression spring. This can provide some assistance for the process of the squeezed areas of the two flexible bushings 842 gradually recovering from the deformed state to the flat state under the action of their own elastic deformation.

[0060] Fifthly, when the deformed areas of the two flexible bushings 842 rotate with the corresponding pressure roller 5 to the position corresponding to the strong magnet 732, the corresponding magnetic slide plates 844 will slide further towards the side of the corresponding rigid bushing 841 under the action of magnetic repulsion, thereby pushing the corresponding flexible bushing 842 from the deformed state to the flat state, thus achieving the effect of effectively contacting the left and right sides of the crease line of the paperboard and releasing pressure again when it contacts the paperboard again.

[0061] Advantage six: When adjusting the left and right spacing of the pressure roller 5, the external drive controls the two bidirectional lead screws 71 to rotate in opposite directions. The two connecting plates 72 will drive the corresponding pressure rollers 5 to move closer or further apart through the corresponding conveyor rollers 6, thus achieving a convenient and precise adjustment of the left and right spacing of the pressure roller 5 through the bidirectional lead screws 71. When adjusting the up and down spacing of the pressure roller 5, the external drive controls the two adjusting lead screws 41 to rotate in opposite directions. The two upper sleeves 4 will jointly drive the two upper left and right transmission shafts 3 to slide up or down along the waist-shaped sliding holes, thus achieving a convenient and precise adjustment of the up and down spacing of the pressure roller 5 through the adjusting lead screws 41. With the flexible compensation of the elastic bushing 821 and the rigid bushing 841, the problem of low tolerance for spacing adjustment when a single hardness top block is used to obtain a barely acceptable indentation effect can be avoided. Slight machine vibration or slight fluctuations in cardboard thickness can lead to batch collapse or poor indentation.

[0062] Advantage 7: The dense small bumps on the rigid bushing 841 and the sparse large bumps on the flexible bushing 842 are a gradient design, which not only provides a support gradient for the paperboard, but also guides the flow of paperboard fibers during the creasing process, reducing friction and scratches on the paperboard.

[0063] 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 the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cardboard anti-collapse and indentation device based on gradient elastic top blocks, characterized in that, include: The frame (1) on the right side has a receiving plate (2). Multiple rectangular and evenly distributed drive shafts (3) are installed on the inner walls of the front and rear ends of the frame (1) and rotate together. Multiple matching grooves are pre-set on the outer walls of the drive shafts (3). Each pair of left and right drive shafts (3) is fitted with a sleeve plate (4) that rotates together at both ends. Pressure rollers (5) are symmetrically slidably fitted on the outer walls of the upper and lower drive shafts (3) on the left side. Conveyor rollers (6) that slide on the pressure rollers (5) are installed at both ends of the pressure rollers (5). An adjustment part (7) is provided on the frame (1). Indentation part (8) is provided on the multiple pressure rollers (5). The adjustment part (7) includes a two-way lead screw (71) that is rotatably installed on the inner walls of the front and rear ends of the frame (1). The upper left and right transmission shafts (3) are symmetrically fitted with connecting plates (72) on their outer walls. The lower left and right transmission shafts (3) are fitted with multiple adjustment plates (73) on their outer walls. The two lower front and rear adjustment plates (73) are each fitted with an extension plate (74) at their opposite ends. The indentation section (8) includes a pre-pressing ring cutter (81) fixedly sleeved on the outer wall of multiple left-side pressure rollers (5), a pre-pressing group (82) is provided on each of the multiple left-side pressure rollers (5), a main pressing ring cutter (83) is fixedly sleeved on the outer wall of the two upper right pressure rollers (5), and a main pressing group (84) is provided on each of the two lower right pressure rollers (5). The pre-compression group (82) includes elastic bushings (821) located on both the front and rear sides of the pre-compression ring cutter (81). The elastic bushings (821) on both the front and rear sides are fixedly sleeved on the pressure roller (5). A pressure relief groove (822) is opened on the outer wall of the pressure roller (5) corresponding to the two elastic bushings (821). The main pressure assembly (84) includes a rigid bushing (841) fixedly sleeved on the outer wall of the pressure roller (5). The outer wall of the rigid bushing (841) is provided with a number of dense small protrusions evenly distributed in a circle. Flexible bushings (842) are fixedly sleeved on both the front and rear sides of the rigid bushing (841) on the outer wall of the pressure roller (5). The outer wall of the flexible bushing (842) is provided with a number of sparse large protrusions evenly distributed in a circle. Pressure relief grooves (843) are opened on the outer wall of the pressure roller (5) corresponding to the two flexible bushings (842). Multiple magnetic sliding plates (844) evenly distributed in a circle are slidably installed on the inner wall of the pressure relief groove (843) by compression springs. The multiple magnetic sliding plates (844) on the front and rear sides are symmetrically arranged.

2. The anti-collapse and indentation device for cardboard boxes based on gradient elastic top blocks according to claim 1, characterized in that: The opposite ends of the two connecting plates (72) are rotatably connected to the corresponding conveying rollers (6). Connecting slide rods (721) are symmetrically installed on the upper end of the connecting plate (72). A support plate (722) is provided on the upper side of the connecting plate (72) through a threaded sleeve on the bidirectional lead screw (71). The two connecting slide rods (721) slide through the support plate (722).

3. The anti-collapse and indentation device for cardboard boxes based on gradient elastic top blocks according to claim 1, characterized in that: Multiple adjustment plates (73) are rotatably connected to the corresponding conveying rollers (6). The frontmost and rearmost adjustment plates (73) are equipped with docking slide plates (731) on the opposite ends of the right conveying rollers (6). Strong magnets (732) are embedded on the lower side of the opposite ends of the front and rear docking slide plates (731). The lower right side of the conveying rollers (6) corresponding to the adjustment plates (73) is provided with an annular groove facing the docking slide plate (731). The docking slide plate (731) is slidably connected to the inner wall of the corresponding annular groove.

4. The anti-collapse and indentation device for cardboard boxes based on gradient elastic top blocks according to claim 1, characterized in that: The frame (1) has clearance grooves on the inner walls at both ends. A baffle (741) is installed on the end of the extension plate (74) facing the clearance groove. An installation groove is provided on the upper end of the baffle (741). An auxiliary pressure plate (742) is slidably connected to the inner wall of the installation groove by a compression spring. Sliding holes are symmetrically provided on the upper end of the baffle (741). A support slide rod (743) is slidably installed in the sliding hole and connected to the baffle (741) by a compression spring at its lower end. A positioning plate (744) is installed on the upper end of the two support slide rods (743). A cover plate (745) is installed on the end of the positioning plate (744) facing the corresponding adjustment plate (73).

5. The anti-collapse and indentation device for cardboard boxes based on gradient elastic top blocks according to claim 1, characterized in that: Each of the two upper and lower sleeve plates (4) is provided with an adjusting screw (41) fixedly connected to the frame (1) by a bearing seat. The upper side of the adjusting screw (41) is threaded to the sleeve plate (4), and the lower side of the adjusting screw (41) rotates through the lower sleeve plate (4).

6. The anti-collapse and indentation device for cardboard boxes based on gradient elastic top blocks according to claim 4, characterized in that: The frame (1) has waist-shaped sliding holes on the inner walls of the front and rear ends corresponding to the upper left and right drive shafts (3). The front and rear ends of the upper left and right drive shafts (3) are slidably connected to the inner walls of the corresponding waist-shaped sliding holes, and the rear ends of the upper and lower left and right drive shafts (3) are connected by synchronous belts.

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