A paper container tipping device and a paper container tipping method

Abstract

The application relates to a paper container edge rolling device and a paper container edge rolling method. The paper container edge rolling device comprises a folding edge assembly, an edge rolling assembly, a folding edge guide assembly and a driving assembly. The folding edge assembly comprises a male die and a folding edge die arranged around the male die. The edge rolling assembly comprises a female die and an edge rolling die arranged around the female die. The folding edge die and the male die can slide relative to each other, and the edge rolling die and the female die can slide relative to each other. The driving assembly comprises a pressing driving part, a folding edge driving part, an edge rolling driving part and a guide driving part. The pressing driving part is drivingly connected to the male die and used for pressing the male die towards the female die to fix a paper container semi-finished product shown in the figure. The folding edge driving part is drivingly connected to the folding edge die and used for folding a convex edge of the paper container semi-finished product shown in the figure into a U-shaped groove structure in a paper container folding edge semi-finished product shown in the figure according to a preset fold. The edge rolling driving part is drivingly connected to the edge rolling die to make the edge rolling die move along the opening and closing direction of the male die and the female die. The guide driving part is drivingly connected to the folding edge guide assembly.

Description

Technical Field

[0001] This invention relates to the field of paper container seam technology, and in particular to a paper container seam device and a paper container seam method. Background Technology

[0002] Paper containers have been widely used in the catering industry due to their eco-friendly, lightweight, and low-cost characteristics. However, because paper has weak bending resistance, the structural strength of the container opening is relatively weak. Under external force, the container opening is easily deformed or even torn. In addition, the container opening can easily scratch people. These problems have always restricted the promotion and development of paper containers.

[0003] Therefore, during the production process, the edges of the container opening are also rolled or folded. Rolling technology turns the container opening outward to form a three-dimensional structure in the shape of a ring-shaped tube, while folding technology folds the container opening once to form a convex edge or twice to form a U-shaped groove. Both of these methods increase the structural strength by transforming the container opening into a three-dimensional structure.

[0004] However, existing edge-rolling technology requires softening the paper at the container opening before stretching and turning it outward, which reduces the strength of the paper itself. In edge-folding technology, to facilitate the removal of the paper container, the container opening is at most folded to form a U-shaped groove, but problems such as pressure indentation still exist in actual use. Edge-folding technology also requires softening the container opening. If edge-folding and edge-rolling are performed separately, the paper will easily become brittle during repeated softening, thereby reducing the toughness of the paper at the container opening. Summary of the Invention

[0005] Given the low structural strength of existing paper container openings, it is necessary to provide a paper container opening device and method that can simultaneously increase the structural strength and toughness of the container opening.

[0006] A paper container seam sealing device, comprising:

[0007] A folding assembly, the folding assembly including a male mold and a folding mold slidably surrounding the male mold, and forming a relief groove between the folding mold and the male mold;

[0008] A crimping assembly, comprising a female mold that matches the male mold and a crimping die that is slidably arranged around the female mold, the crimping die having a crimping groove that matches the inner wall shape of the folding die and a plurality of insertion holes that are spaced apart along the extending direction of the crimping groove and correspond to the relief groove.

[0009] A hem guide assembly, comprising a plurality of guide rods slidably passing through the insertion hole; and

[0010] A driving assembly is connected to the folding die, the rolling die, the male die, and the folding guide assembly. The guide rod of the folding guide assembly is used to pass through the insertion hole and extend into the relief groove under the drive of the driving assembly.

[0011] This setup enables continuous bending and rolling of the container opening at the same workstation, improving rolling efficiency, increasing the structural strength of the paper container at the opening, and enhancing the toughness of the container opening because it eliminates the need for secondary softening treatment of the opening edge.

[0012] In one embodiment, the rolled groove includes a straight edge segment and an arc edge segment that are connected end to end and arranged alternately, the plurality of insertion holes include a plurality of first positioning holes located on the straight edge segment and a plurality of second positioning holes located on the arc edge segment, and the plurality of guide rods include a plurality of first positioning rods corresponding to the first positioning holes and a plurality of second positioning rods corresponding to the second positioning holes.

[0013] With this configuration, the positions of the first and second positioning rods correspond to the creases on the convex edge of the paper container, thus ensuring the stability of the bent edge shape and preventing the paper from bending in other directions.

[0014] In one embodiment, the insertion hole passes through the rolling die along the opening and closing direction of the male mold and the female mold, and the folding guide assembly further includes a mounting base fixedly connected to the plurality of guide rods, and the driving assembly is drivenly connected to the mounting base.

[0015] This configuration integrates multiple guide rods into the same mounting base, enabling them to rise or fall uniformly. This helps reduce the matching error between the guide rods and also provides a stop for the bent edge, working in conjunction with the bending die to clamp the bent edge, thus ensuring the stability of the bent edge shape.

[0016] In one embodiment, the folding assembly further includes an elastic element, the two ends of which abut against the folding mold and the male mold respectively along the opening and closing directions of the male mold and the female mold.

[0017] This design enables the folding die to automatically and quickly spring back, simplifying the structure and improving the rolling efficiency of paper containers.

[0018] In one embodiment, the roll groove has a guide surface that gradually extends away from the female mold toward the male mold.

[0019] With this setup, the bent edge is guided by the guide surface and softened by the rolling die, reducing the difficulty of rolling the bent edge and facilitating the formation of a stable rolled edge.

[0020] In one embodiment, the folding assembly further includes a heat insulation plate fixedly connected to the folding mold, and the driving assembly includes a folding driving member that drives the heat insulation plate.

[0021] This design reduces the amount of heat transferred from the folding die to the folding drive, thus preventing the folding drive from overheating and being damaged.

[0022] In one embodiment, the folding assembly further includes a first movable plate and a plurality of first connecting rods extending from the first movable plate toward the female mold, the first connecting rods being fixedly connected to the male mold;

[0023] The driving assembly includes a pressing driving component that is driven to be connected to the first movable plate, and the folding driving component is fixedly connected to the first movable plate.

[0024] With this configuration, the male mold and the folding mold can move synchronously under the drive of the pressing drive, which facilitates the folding mold to bend the convex edge of the paper container in a smooth manner. This improves the tightness of the fit between the folding mold and the male mold, helps to reduce fit errors, and thus improves the rolling quality of the paper container.

[0025] In one embodiment, the seam assembly further includes a second movable plate, a second connecting rod extending from the second movable plate toward the male mold, and a fixing seat having a plurality of sliding holes;

[0026] The second connecting rod is movably inserted through the sliding hole and fixedly connected to the rolling die.

[0027] With this configuration, the rolling die slides stably along the sliding hole under the action of the second connecting rod, which helps to improve the forming quality of the rolling end.

[0028] In one embodiment, the driving assembly further includes a guide drive member fixedly connected to the fixed base, the guide drive member being driven to the folding guide assembly.

[0029] This design simplifies the structure, allowing the fixing seat to not only restrict the sliding of the rods, but also provide support and reference for the sliding of the rolling die and guide rod.

[0030] The present invention also provides a method for rolling the opening of a paper container, for use in the aforementioned paper container rolling device, comprising the following steps:

[0031] Drive the folding guide assembly to move toward the male mold, so that the guide rod is close to the pressing surface of the female mold;

[0032] Drive the male mold toward the female mold so that the annular convex edge of the paper container is pressed against the pressing surface of the female mold;

[0033] Drive the folding die toward the master die to bend the annular convex edge of the paper container under the guidance of the guide rod to form the folded edge of the paper container;

[0034] Drive the hemming guide assembly to move away from the male mold, so that the guide rod retracts into the insertion hole; and

[0035] The rolling die is driven to move toward the male die so that the bent edge is rolled toward the female die through the rolling groove of the rolling die.

[0036] This method is used to roll the mouth of paper containers. By bending the edge, it avoids the stretching of the paper during the softening process that may occur in existing rolling processes. The step of driving the folding guide component away from the mold also achieves the effect of rolling the bent edge inward without moving the paper container folding semi-finished product. This ensures the continuity of the paper container rolling process, thereby improving the quality of the paper container rolling and also helping to increase the overall structural strength and toughness of the finished paper container. Attached Figure Description

[0037] Figure 1 This is a structural diagram of a semi-finished paper container.

[0038] Figure 2 A schematic diagram of the structure of a semi-finished paper container with folded edges;

[0039] Figure 3 This is a structural diagram of the finished paper container;

[0040] Figure 4 for Figure 1 A schematic diagram of the creases on the convex edge of the semi-finished paper container shown;

[0041] Figure 5 This is a schematic diagram of the structure of a paper container rolling device provided by the present invention;

[0042] Figure 6 for Figure 5 The front view of the paper container seam device shown;

[0043] Figure 7 for Figure 5 A schematic diagram of the structure of the center folding edge component;

[0044] Figure 8 for Figure 5 A planar schematic diagram of the folded edge assembly shown;

[0045] Figure 9 for Figure 8 The folded edge assembly shown is a cross-sectional view along the AA direction;

[0046] Figure 10 for Figure 5Schematic diagram of the center seam assembly and the folding guide assembly;

[0047] Figure 11 for Figure 10 A planar schematic diagram of the structure shown;

[0048] Figure 12 for Figure 11 The structure shown is a cross-sectional view along the BB direction;

[0049] Figure 13 for Figure 12 A magnified view of a section at point X;

[0050] Figure 14 for Figure 5 Schematic diagram of the structure of the center folding guide component;

[0051] Figure 15 A flowchart of a paper container rolling method provided by the present invention.

[0052] Figure label:

[0053] 10. Folding assembly; 101. Relief groove; 11. Male mold; 12. Folding mold; 121. Folding plate; 122. First heating element; 13. First movable plate; 14. First connecting rod; 15. Elastic element; 16. Heat insulation plate;

[0054] 20. Rolled edge assembly; 21. Female mold; 211. Pressing surface; 22. Rolled edge mold; 2201. Rolled edge groove; 22011. Straight edge section; 22012. Arc edge section; 22013. Guide surface; 2202. Insertion hole; 22021. First positioning hole; 22022. Second positioning hole; 221. Rolled edge plate; 222. Second heating element; 23. Second movable plate; 24. Second connecting rod; 25. Fixed base; 251. Sliding hole;

[0055] 30. Folding guide assembly; 31. Guide rod; 311. First positioning rod; 312. Second positioning rod; 32. Mounting base; 321. Base body; 322. Fixing plate; 33. Guide rod;

[0056] 40. Drive assembly; 41. Folding drive component; 42. Guide drive component; 43. Bearing;

[0057] 50. Paper container semi-finished product; 51. Paper container folded edge semi-finished product; 52. Paper container finished product; 501. Convex edge; 502. Bending edge; 503. Folded edge. Detailed Implementation

[0058] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0059] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0060] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0061] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0062] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0063] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0064] Paper containers have been widely used in the catering industry due to their eco-friendly, lightweight, and low-cost characteristics. However, because paper has weak bending resistance, the structural strength of the container opening is relatively weak. Under external force, the container opening is easily deformed or even torn. In addition, the container opening can easily scratch people. These problems have always restricted the promotion and development of paper containers.

[0065] Therefore, during the production process, the edges of the container opening are also rolled or folded. Rolling technology turns the container opening outward to form a three-dimensional structure in the shape of a ring-shaped tube, while folding technology folds the container opening once to form a convex edge or twice to form a U-shaped groove. Both of these methods increase the structural strength by transforming the container opening into a three-dimensional structure.

[0066] However, existing edge-rolling technology requires softening the paper at the container opening before stretching and turning it outward, which reduces the strength of the paper itself. In edge-folding technology, to facilitate the removal of the paper container, the container opening is at most folded to form a U-shaped groove, but problems such as pressure indentation still exist in actual use. Edge-folding technology also requires softening the container opening. If edge-folding and edge-rolling are performed separately, the paper will easily become brittle during repeated softening, thereby reducing the toughness of the paper at the container opening.

[0067] Therefore, it is necessary to provide a paper container seaming device and a paper container seaming method that can increase the structural strength and toughness of the container opening of the paper container.

[0068] Please see Figures 1 to 5 and Figure 13 , Figure 14 , Figure 1 This is a structural diagram of the paper container semi-finished product 50. Figure 2 This is a structural diagram of the paper container folding semi-finished product 51. Figure 3 This is a structural schematic diagram of the finished paper container 52. Figure 4 for Figure 1 The diagram shows the creases on the raised edge 501 of the semi-finished paper container 50. Figure 5 This is a schematic diagram of the structure of a paper container rolling device provided by the present invention. Figure 13for Figure 12 A magnified view of the area at point X. Figure 14 for Figure 5 A schematic diagram of the structure of the center folding guide component 30.

[0069] Figure 1 The paper container semi-finished product 50 shown has a raised edge 501 surrounding the container opening. Figure 2 The paper container folded edge semi-finished product 51 shown also includes a bent edge 502 formed by folding a portion of the convex edge 501. Figure 3 The paper container finished product 52 shown also includes a rolled edge 503 formed by rolling up a portion of the bent edge 502.

[0070] The paper container seaming device provided by this invention includes a folding assembly 10, a seaming assembly 20, a folding guide assembly 30, and a driving assembly 40. The folding assembly 10 includes a male mold 11 and a folding mold 12 surrounding the male mold 11. The seaming assembly 20 includes a female mold 21 and a seaming mold 22 surrounding the female mold 21. The folding mold 12 and the male mold 11 are relatively slidable, and the seaming mold 22 and the female mold 21 are relatively slidable. The driving assembly 40 includes a pressing drive (not shown), a folding drive 41, a seaming drive (not shown), and a guide drive 42. The pressing drive is driven and connected to the male mold 11 to press the male mold 11 toward the female mold 21 for fixation. Figure 1 The paper container semi-finished product 50 shown has a folding drive 41 that is driven and connected to the folding mold 12 for use in... Figure 1 The protruding edge 501 of the paper container semi-finished product 50 shown is folded according to the preset creases. Figure 2 The U-shaped groove structure in the paper container folding semi-finished product 51 shown is driven by the rolling mouth drive component connected to the rolling mouth mold 22 so that the rolling mouth mold 22 moves along the opening and closing direction of the male mold 11 and the female mold 21, and the guide drive component 42 is driven by the folding guide component 30.

[0071] Taking into account both the strength requirements of the rolled edge and the need for easy removal of the finished paper container after rolling, this invention provides a clearance groove 101 between the folding mold 12 and the male mold 11. The rolling edge mold 22 has a rolling edge groove 2201 and multiple insertion holes 2202. The shape of the rolling edge groove 2201 matches the shape of the inner wall of the folding mold 12. The multiple insertion holes 2202 are arranged at intervals along the extension direction of the rolling edge groove 2201 and correspond to the creases of the paper container semi-finished product 50. The folding guide assembly 30 includes multiple insertion holes 2202 that correspond one-to-one with each other. The guide rod 31 is slidably inserted into the insertion hole 2202. Under the drive of the guide drive assembly 40, the guide rod 31 passes through the insertion hole 2202 and extends into the relief groove 101 to guide the folding die 12 to fold the protruding edge 501 of the paper container semi-finished product 50 along the pre-fold line. After the bent edge 502 is formed, the guide drive assembly 42 drives the guide rod 31 to retract into the insertion hole 2202 or exit the insertion hole 2202 to make room for the rolling die 22 to roll the bent edge 502 part inward into the rolled edge 503.

[0072] It is worth noting that, Figure 11 The structure shown does not include the male mold 11 and the folding mold 12. Please refer to [link / reference] for details. Figure 9 , Figure 9 for Figure 8 The folding assembly 10 shown is in a cross-sectional view along the AA direction. When the folding mold 12 is driven close to the female mold 21 by the folding drive member 41, the inclined portion of the outer peripheral surface of the male mold 11 and the inner wall of the folding mold 12 are arranged at intervals to form the relief groove 101.

[0073] The paper container rolling device provided by this invention has at least the following advantages: First, by cooperating with the folding guide component 30 and the folding mold 12, the convex edge 501 is folded along the pre-fold line, ensuring the shape stability of the bent edge 502 formed by the convex edge 501, which facilitates the subsequent further rolling of the bent edge 502; Second, the convex edge 501 of the paper container semi-finished product 50 is continuously bent at the same station, forming it in one step, which improves the efficiency of paper container rolling and avoids repeated softening treatment of the container mouth edge at multiple stations, thereby ensuring the structural strength and toughness of the paper container at the container mouth; Third, rolling the bent edge 502 inward toward the mother mold 21 on the basis of the bent edge 502 increases the paper density of the rolled edge 503, thereby improving the structural strength of the paper container at the container mouth; Finally, the rolling treatment of the paper container also eliminates the original sharp convex edge 501 on the paper container, thereby protecting the user and improving the safety of use.

[0074] To facilitate bending and rolling of the curved edge of this paper container, the convex edge 501 of the semi-finished paper container 50 is also pre-cut with radial creases to accommodate the wrinkles generated at the mouth of the paper container during actual bending and rolling.

[0075] Optional, please refer to the following as well. Figure 11 and Figure 13 , Figure 11 for Figure 10 The schematic diagram of the structure shown illustrates that, in this invention, the roll groove 2201 includes a straight edge segment 22011 and an arc edge segment 22012 that are connected end-to-end and arranged alternately. Multiple insertion holes 2202 include multiple first positioning holes 22021 located on the straight edge segment 22011 and multiple second positioning holes 22022 located on the arc edge segment 22012. Multiple guide rods 31 include multiple first positioning rods 311 corresponding to the first positioning holes 22021 and multiple second positioning rods 312 corresponding to the second positioning holes 22022. Thus, the positions of the first positioning rods 311 and the second positioning rods 312 correspond to the creases on the convex edge 501 of the paper container, thereby ensuring the stability of the shape of the bent edge 502 and preventing the paper from bending in other directions.

[0076] It is understood that in the above embodiments, the number of the first positioning rod 311 and the second positioning rod 312 is not fixed. In order to increase the stability of the curved edge bending, the number of the second positioning rod 312 can be increased and the diameter of the second positioning rod 312 can be reduced.

[0077] Preferably, in one embodiment of the present invention, the insertion hole 2202 passes through the rolling die 22 along the opening and closing direction of the male die 11 and the female die 21. The folding guide assembly 30 also includes a mounting base 32 fixedly connected to multiple guide rods 31, and a guide drive member 42 is drivenly connected to the mounting base 32. Integrating multiple guide rods 31 into the same mounting base 32 in this way enables the multiple guide rods 31 to be raised or lowered uniformly, which helps to reduce the matching error between the guide rods 31. At the same time, it can also form a stop for the bent edge 502 and cooperate with the folding die 12 to clamp the bent edge 502, thereby ensuring the stability of the shape of the bent edge 502. In addition, this also reduces the number of drive members and simplifies the structure.

[0078] It is understood that in other embodiments, the guide rod 31 can also be a telescopic rod, and the through direction of the insertion hole 2202 can also be inclined to the opening and closing direction of the male mold 11 and the female mold 21. As long as it can be inserted into the relief groove 101 and correspond to the crease on the paper container protrusion 501, the bending of the protrusion 501 can be completed.

[0079] For details, please refer to Figures 7 to 9 , Figure 7 for Figure 5 A schematic diagram of the structure of the center folding component 10. Figure 8 for Figure 5 A plan view of the folding component 10 shown. Figure 9 for Figure 8 The folded edge assembly 10 shown is in cross-sectional view along the AA direction.

[0080] The folding assembly 10 also includes a first movable plate 13, a plurality of first connecting rods 14 and a heat insulation plate 16. The first connecting rods 14 extend from the first movable plate 13 toward the female mold 21 and are fixedly connected to the male mold 11. The folding drive component 41 is installed on the side of the first movable plate 13 facing the male mold 11 and is located between the plurality of first connecting rods 14. The two opposite sides of the heat insulation plate 16 are fixedly connected to the folding drive component 41 and the folding mold 12, respectively. The pressing drive component (not shown) is driven to be connected to the first movable plate 13 to drive the male mold 11 and the folding mold 12 to move synchronously. In this way, the folding die 12 and the male die 11 fit together tightly. After the male die 11 and the female die 21 are pressed together, the folding die 12 can press against the convex edge 501 of the paper container towards the female die 21 under the drive of the folding drive component 41, and cooperate with the folding guide component 30 to complete the bending edge 502. The entire bending process is tightly fitted, which helps to reduce the error of the bending edge 502, thereby improving the rolling quality of the paper container. The setting of the heat insulation plate 16 also reduces the heat transfer from the folding die 12 to the folding drive component 41, which can prevent the folding drive component 41 from overheating and being damaged.

[0081] Furthermore, the folding assembly 10 also includes an elastic member 15 located between the folding die 12 and the male die 11. The two ends of the elastic member 15 abut against the folding die 12 and the male die 11 along the opening and closing directions of the male die 11 and the female die 21, respectively. This enables the folding die 12 to automatically and quickly spring back, simplifies the structure, and improves the rolling efficiency of the paper container.

[0082] The folding mold 12 includes a folding plate 121 with a heating channel and a first heating element 122 disposed in the heating channel to soften the protruding edge 501, thereby facilitating the formation of the bent edge 502 and the shaping of the bent edge 502.

[0083] For details, please refer to Figures 10 to 12 , Figure 10 for Figure 5 Schematic diagram of the structure of the center seam assembly 20 and the folding guide assembly 30. Figure 11 for Figure 10 A planar schematic diagram of the structure shown. Figure 12 for Figure 11 The structure shown is a cross-sectional view along the BB direction.

[0084] The crimping assembly 20 also includes a second movable plate 23, a second connecting rod 24, and a fixed base 25. The second connecting rod 24 extends from the second movable plate 23 toward the male mold 11. The fixed base 25 has a plurality of sliding holes 251. The second connecting rod 24 is slidably inserted through the sliding holes 251 and fixedly connected to the crimping mold 22. The edge-flipping 503 driving member (not shown) is driven to be connected to the second movable plate 23 to drive the second connecting rod 24 and the crimping mold 22 closer to the male mold 11.

[0085] Optionally, in one embodiment of the present invention, the guide drive member 42 is fixedly connected to the fixed base 25. This simplifies the structure, allowing the fixed base 25 to not only restrict the sliding of the rod, but also to provide support and reference for the sliding of the rolling die 22 and the guide rod 31.

[0086] It is understandable that the seam drive component used to drive the seam die 22 can also be fixedly connected to the fixed base 25, as long as it does not interfere with other structures.

[0087] The rolling die 22 includes a rolling plate 221 with a heating channel and a second heating element 222 disposed in the heating channel, so as to soften the edge of the bent edge 502 during rolling, thereby facilitating the rolling process.

[0088] The roll groove 2201 also has a guide surface 22013 that extends toward the male mold 11 and gradually away from the female mold 21. The guide surface 22013 is used to guide the edge of the bent edge 502 into the roll groove 2201.

[0089] Optionally, the cross-section of the rolled groove 2201 is semi-circular, which can fully soften the bent edge 502, thereby reducing the resistance caused by inward shrinkage when the bent edge 502 is rolled inward, which is conducive to forming a complete circular tubular rolled edge 503.

[0090] Please refer to it again. Figure 14 Specifically, in one embodiment of the present invention, the folding guide assembly 30 further includes a plurality of guide rods 33 located on the side of the mounting base 32 facing the fixing base 25, and a plurality of guide holes are correspondingly opened on the fixing base 25, which helps to improve the stability of the sliding of the guide rods 31.

[0091] Optionally, the mounting base 32 includes a base body 321 and a fixing plate 322 detachably mounted on the base body 321. The guide drive 42 drives the fixed plate 322 to move the entire bent edge 502 drive assembly 40, thus facilitating maintenance and replacement.

[0092] Optionally, the drive assembly 40 also includes a plurality of bearings 43 mounted on the fixed base 25, the bearings 43 being used to mount the second connecting rod 24 and / or the guide rod 33 to increase the stability of the rod sliding in the hole.

[0093] Please see Figure 15 , Figure 15 A flowchart of a paper container rolling method provided by the present invention.

[0094] The present invention also provides a method for rolling the opening of a paper container, comprising the following steps:

[0095] S1. Drive the folding guide assembly 30 to move toward the male mold 11 so that the guide rod 31 approaches the pressing surface 211 of the female mold 21;

[0096] S2. Drive the male mold 11 to move toward the female mold 21 so that the annular protrusion 501 of the paper container is pressed against the pressing surface 211 of the female mold 21;

[0097] S3. Drive the folding mold 12 to move toward the mother mold 21, so as to bend the annular convex edge 501 of the paper container under the guidance of the guide rod 31 to form the folded edge 502 of the paper container.

[0098] S4. Drive the folding guide assembly 30 to move away from the male mold 11, so that the guide rod 31 retracts into the insertion hole 2202; and

[0099] S5. Drive the rolling die 22 to move toward the male die 11 so that the bent edge 502 is rolled toward the female die 21 through the rolling groove 2201 of the rolling die 22.

[0100] The order of S1 and S2 can be interchanged or performed simultaneously, as long as the folding guide component 30 reaches the preset position before S3.

[0101] It is understood that, in this invention, the initial position of the guide rod 31 being coplanar with the pressing surface 211 of the female mold 21 is a preferred technical solution, as this allows for adaptation. Figure 1 In actual use, when the tilt angle of the annular protrusion 501 of the paper container semi-finished product 50 changes, it is also necessary to adjust the initial position of the guide rod 31 and the tilt angle of the end face of the guide rod 31 accordingly.

[0102] Optionally, in one embodiment, in S3, the distance by which the folding die 12 moves toward the female die 21 is the length of the folded edge 502, and in S5, the distance by which the rolling die 22 moves toward the male die 11 is the length of the rolled edge 503. During S5, the folding die 12 and the rolling die 22 move synchronously.

[0103] Optionally, in another embodiment, a sub-step is included between steps S4 and S5, in which the folding drive 41 drives the folding die 12 to move away from the mother die 21 by a preset distance, which is at least equal to the length of the folded edge, to make way for the movement of the folding die 22.

[0104] Optionally, in other embodiments, the distance that the driving folding mold 12 in S3 moves toward the mother mold 21 is the difference between the length of the folded edge 502 and the length of the rolled edge 503, so as to make way for the movement of the rolling die 22.

[0105] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0106] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A paper container seam rolling device, characterized in that, include: The folding assembly (10) includes a male mold (11) and a folding mold (12) slidably arranged around the male mold (11), and a relief groove (101) is formed between the folding mold (12) and the male mold (11). A rolled edge assembly (20) includes a female mold (21) that matches the male mold (11) and a rolled edge mold (22) that is slidably arranged around the female mold (21). The rolled edge mold (22) has a rolled edge groove (2201) that matches the shape of the inner wall of the folding mold (12) and a plurality of insertion holes (2202) that are spaced apart along the extension direction of the rolled edge groove (2201) and correspond to the relief groove (101). The rolled edge groove (2201) includes a straight edge section (22011) and an arc edge section (22012) that are connected end to end and arranged alternately. The plurality of insertion holes (2202) include a plurality of first positioning holes (22021) located on the straight edge section (22011) and a plurality of second positioning holes (22022) located on the arc edge section (22012). A hem guide assembly (30) includes a plurality of guide rods (31), each guide rod (31) being slidably inserted into the insertion hole (2202). Each guide rod (31) includes a plurality of first positioning rods (311) corresponding to the first positioning hole (22021) and a plurality of second positioning rods (312) corresponding to the second positioning hole (22022). The driving assembly (40) includes a pressing drive, a folding drive (41), a curling drive, and a guide drive (42). The pressing drive is driven to connect to the male mold (11) to press the male mold (11) toward the female mold (21) to fix the paper container semi-finished product (50). The guide rod (31) of the folding guide assembly (30) is driven by the guide drive (42) to pass through the insertion hole (2202) and extend into the relief groove (101). The folding drive (41) drives... The folding mold (12) is used to fold the convex edge (501) of the paper container semi-finished product (50) into a bent edge (502). The guide drive (42) drives the guide rod (31) to retract into the insertion hole (2202) or exit the insertion hole (2202) to make room for the rolling die (22) to roll the bent edge (502) into a rolled edge (503). The rolling drive drives the rolling die (22) to move the rolling die (22) along the opening and closing direction of the male mold (11) and the female mold (21).

2. The paper container rolling device according to claim 1, characterized in that, The insertion hole (2202) passes through the rolling die (22) along the opening and closing direction of the male die (11) and the female die (21). The folding guide assembly (30) also includes a mounting base (32) fixedly connected to the plurality of guide rods (31). The drive assembly (40) is driven and connected to the mounting base (32).

3. The paper container rolling device according to claim 1, characterized in that, The folding assembly (10) further includes an elastic element (15), the two ends of which abut against the folding mold (12) and the male mold (11) respectively along the opening and closing directions of the male mold (11) and the female mold (21).

4. A paper container seam rolling device according to claim 1, characterized in that, The rolled groove (2201) has a guide surface (22013) that extends toward the male mold (11) and gradually away from the female mold (21).

5. A paper container seaming device according to any one of claims 1 to 4, characterized in that, The folding assembly (10) further includes a heat insulation plate (16) fixedly connected to the folding mold (12), and the driving assembly (40) includes a folding driving member (41) that drives the heat insulation plate (16).

6. A paper container seam rolling device according to claim 5, characterized in that, The folding assembly (10) further includes a first movable plate (13) and a plurality of first connecting rods (14) extending from the first movable plate (13) toward the female mold (21), the first connecting rods (14) being fixedly connected to the male mold (11). The drive assembly (40) includes a pressing drive member connected to the first movable plate (13), and the folding drive member (41) is fixedly connected to the first movable plate (13).

7. A paper container seam rolling device according to any one of claims 1 to 4, characterized in that, The roll-up assembly (20) also includes a second movable plate (23), a second connecting rod (24) extending from the second movable plate (23) toward the male mold (11), and a fixed seat (25) having a plurality of sliding holes (251). The second connecting rod (24) is movably inserted through the sliding hole (251) and fixedly connected to the rolling die (22).

8. A paper container seam rolling device according to claim 7, characterized in that, The drive assembly (40) further includes a guide drive member (42) fixedly connected to the fixed base (25), and the guide drive member (42) is driven to be connected to the folding guide assembly (30).

9. A method for rolling the opening of a paper container, used in the paper container rolling device according to any one of claims 1-8, characterized in that, Includes the following steps: Drive the folding guide assembly (30) toward the male mold (11) so that the guide rod (31) approaches the pressing surface (211) of the female mold (21). Drive the male mold (11) toward the female mold (21) to press the annular protrusion (501) of the paper container against the pressing surface (211) of the female mold (21). Drive the folding mold (12) toward the mother mold (21) to bend the annular convex edge (501) of the paper container under the guidance of the guide rod (31) to form the folded edge (502) of the paper container. Drive the hemming guide assembly (30) away from the male mold (11) to move so that the guide rod (31) retracts into the insertion hole (2202); and Drive the rolling die (22) toward the male die (11) to roll the bent edge toward the female die (21) through the rolling groove (2201) of the rolling die (22).

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