An end face sealing mechanism for a carton packer and a carton packer

Abstract

The present application relates to the technical field of cigarette equipment, and particularly relates to an end face sealing and ironing mechanism for a carton packaging machine and the carton packaging machine. The end face sealing and ironing mechanism comprises a preheating iron and a cosmetic iron. The preheating iron and the cosmetic iron are sequentially arranged from bottom to top along the lifting direction of the carton. The relative distance between the preheating iron and the end face of the carton is less than the relative distance between the cosmetic iron and the end face of the carton. The preheating iron is connected to a support through an elastic structure. When the carton is sealed and ironed, the end face of the carton abuts against the preheating iron, so that the elastic structure is elastically deformed. The elastic structure drives the preheating iron to apply a transverse extrusion force to the carton during the deformation process and stores elastic force. When the carton leaves by overcoming the transverse extrusion force, the elastic structure releases the elastic force and drives the preheating iron to reset. The present application ensures the sealing and ironing effect of the transparent paper overlapping area of the end face of the carton through the cooperative design of the preheating iron and the cosmetic iron and the pressure compensation of the elastic structure.

Description

Technical Field

[0001] This invention relates to the technical field of carton packaging, and in particular to an end-face sealing mechanism for a carton packaging machine and a carton packaging machine. Background Technology

[0002] In the production of carton packaging for products such as cigarettes, the transparent paper packaging is a crucial process for ensuring product quality and enhancing its appearance. The hot-sealing mechanism is a core component of the transparent paper packaging equipment. The hot-sealing process uses the combined action of heat and pressure to heat-seal and shape the folded areas of the transparent paper wrapping the carton, ensuring a tight fit between the transparent paper and the carton surface. This not only enhances the packaging's airtightness, preventing moisture and damage to the product inside, but also guarantees the smoothness and aesthetic appeal of the packaging.

[0003] The invention patent with application number CN201710969570.5 discloses a transparent shaping device for cigarette cartons in special packaging. It includes an end-face shaping soldering iron and cylinder components, a carton lifting cylinder, a side shaping soldering iron and pushing cylinder components, a pack pushing cylinder, a top shaping soldering iron and cylinder components, and a bottom shaping soldering iron for the carton. The end-face shaping soldering iron and cylinder components are located on both sides of the carton conveying channel. The end of the carton conveying channel is provided with a support baffle connected to the carton lifting cylinder. Above the support baffle is a carton rising channel composed of two vertical cigarette baffles. The sides of the carton rising channel are provided with side shaping soldering irons and pushing cylinder components. The top of the carton rising channel is provided with a pack pushing cylinder and a carton transverse moving channel on both sides. The sides of the carton transverse moving channel are provided with a top shaping soldering iron and cylinder components and a bottom shaping soldering iron for the carton.

[0004] However, such devices still have their limitations. Taking our newly produced Panda (Collector's Edition) as an example, because it uses a pre-formed carton with entirely new specifications, processes, and materials, in actual production, although the existing packaging machines have end-face shaping soldering irons to seal the end faces of the carton, quality problems arise when using them to seal this new type of pre-formed carton. Specifically, the pre-formed carton has a dimensional tolerance of ±1mm, and the tolerance distribution is uneven. During the lifting process of the carton, the flat soldering iron and the end face of the carton do not have an ideal plane-to-plane contact. The unstable gap between them causes the overlap of the transparent paper to not be sufficiently pressed, resulting in incomplete sealing. At the same time, as the pressure gradually increases, the end face of the carton is dented under the pressure of the soldering iron, and the overlap of the transparent paper happens to be located in this dented area, further aggravating the poor contact between the soldering iron and the overlap. What's even more challenging is that BOPP film shrinks irreversibly when heated. If the first sealing fails to completely seal the seam, the shrunken film cannot be melted and bonded during a second heating process, resulting in a cumulative effect of "layers of incomplete sealing" and ultimately leading to a significant decrease in the sealing pass rate.

[0005] In summary, during the actual hot stamping process, incomplete shrinkage of the folded and overlapping areas of the transparent paper in the carton packaging leads to incomplete hot stamping, resulting in a decreased hot stamping pass rate and failing to meet the sealing quality requirements of actual production. While conventional methods such as increasing the soldering iron pressure or raising the sealing temperature have been considered to address this issue, the high-toughness BOPP film used in the carton packaging demands greater precision in sealing temperature and pressure. These methods are prone to causing carton deformation or damage to the transparent paper, making it difficult to guarantee sealing quality. Therefore, there is an urgent need to develop a hot stamping mechanism that specifically addresses the sealing problem in the folded and overlapping areas of the transparent paper, thereby improving the sealing quality and stability of the carton transparent paper packaging. Summary of the Invention

[0006] To address the problems existing in the prior art, the present invention provides an end-face sealing mechanism for a carton packaging machine and a carton packaging machine. The end-face sealing mechanism for the carton packaging machine, through the upper and lower dual-station layout of the preheating soldering iron and the beauty soldering iron, and the collaborative design of using an elastic structure for pressure compensation, forms a composite sealing process that can ensure the sealing effect of the overlapping area of ​​the transparent paper on the end face of the carton.

[0007] The technical solution to the problem of this invention is as follows: Firstly, an end-face sealing mechanism for a carton packaging machine is provided for sealing transparent paper onto the end face of a carton. The carton packaging machine includes a lifter that sequentially lifts the carton from a waiting position to a first lifting position and then to a second lifting position. The end-face sealing mechanism for the carton packaging machine includes two soldering iron sets respectively disposed at both ends of the carton, and a bracket for mounting the soldering iron sets. The soldering iron sets include a preheating soldering iron for sealing the carton located at the first lifting position and a cosmetic soldering iron for sealing the carton located at the second lifting position. The preheating soldering iron and the cosmetic soldering iron are lifted along the carton. The orientations are arranged sequentially from bottom to top. The relative distance between the preheating soldering iron and the end face of the strip box is less than the relative distance between the beauty soldering iron and the end face of the strip box. The preheating soldering iron is connected to the bracket through an elastic structure. When sealing the strip box located at the first lifting position, the end face of the strip box abuts against the preheating soldering iron and pushes the preheating soldering iron to move away from the strip box, causing the elastic structure to undergo elastic deformation. During the deformation process, the elastic structure drives the preheating soldering iron to apply a lateral compressive force to the strip box and stores the elastic force. When the strip box overcomes the lateral compressive force and leaves the first lifting position, the elastic structure releases the elastic force and drives the preheating soldering iron to reset.

[0008] Furthermore, the end-face sealing mechanism for a carton packaging machine provided by the present invention may also have the following features: the preheating soldering iron is provided with a sealing surface for sealing the carton, the sealing surface is provided with a protrusion, and the protrusion corresponds to the overlap position of the transparent paper overlapping area on the end face of the carton.

[0009] Furthermore, the end-face sealing mechanism for a carton packaging machine provided by the present invention may also have the following features: the elastic structure includes an elastic steel sheet, a first section of the elastic steel sheet is connected to the bracket to form a fixed end, and a second section is connected to the preheating soldering iron to form a free end, the fixed end and the free end are both located on the same side of the elastic steel sheet; when the end face of the carton abuts against the preheating soldering iron, the elastic steel sheet bends around the fixed end to store elastic force.

[0010] Furthermore, the end-face sealing mechanism for a carton packaging machine provided by the present invention may also have the following feature: the relative distance between the preheating soldering iron and the end face of the carton is 0.7mm smaller than the relative distance between the beauty soldering iron and the end face of the carton.

[0011] Furthermore, the end-face sealing mechanism for a carton packaging machine provided by the present invention may also have the following feature: the outer ridge of the preheating soldering iron is provided with chamfers for guiding the carton.

[0012] Furthermore, the end-face sealing mechanism for a strip box packaging machine provided by the present invention may also have the following features: the beauty soldering iron includes a working part and a heat conduction part, the heat conduction part includes a mounting hole for mounting a heating element and a heat conduction surface, the end of the heating element is engaged in the mounting hole and abuts against the heat conduction surface; the working part includes a working surface, the working surface is connected to the heat conduction surface, and the working surface is further away from the mounting hole than the heat conduction surface.

[0013] Furthermore, the end-face sealing mechanism for a carton packaging machine provided by the present invention may also have the following features: when sealing the carton located at the second lifting position, the working surface abuts against the end face of the carton, and its center coincides with the center of the end face of the carton; the size of the working surface is smaller than the size of the end face of the carton.

[0014] Furthermore, the end-face sealing mechanism for a carton packaging machine provided by the present invention may also have the following feature: the distance from the edge of the working surface to its center is 1.5 mm greater than the distance from the edge of the end face of the carton to its center.

[0015] Secondly, the present invention also provides a carton packaging machine, including an elevator and an end-face sealing mechanism for the carton packaging machine as described above.

[0016] Furthermore, the carton packaging machine provided by the present invention may also have the following features: it further includes a power source for driving the support to move in a horizontal direction; it also includes a PLC, which is electrically connected to the power source and electrically connected to the lifter.

[0017] The beneficial effects of this invention are as follows:

[0018] 1. In this application, the vertical extrusion force formed by the upper and lower dual-station layout of the preheated soldering iron and the beauty soldering iron, combined with the lateral extrusion force compensation brought about by the elastic structure, forms a composite hot stamping process that can ensure the hot stamping effect of the overlapping area of ​​the transparent paper on the end face of the carton.

[0019] 2. In this application, after the preheated soldering iron has completely sealed the overlapping area of ​​the transparent paper, the beauty soldering iron can further beautify it and flatten the end face of the strip box. The two work together to complete a sealing process without any gaps and with a smooth finish. Furthermore, the sealing rhythm of the preheated soldering iron and the beauty soldering iron can be matched with the rhythm of the lifting device lifting the strip box to achieve efficient and damage-free sealing. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. In these drawings, similar reference numerals are used to denote similar elements. The drawings described below are some embodiments of the invention, but not all embodiments. Other drawings will be readily available to those skilled in the art based on these drawings without any inventive effort.

[0021] Figure 1 This is a first-view structural schematic diagram of the end-face sealing and heat sealing mechanism of the present invention;

[0022] Figure 2 This is a second-view structural schematic diagram of the end-face sealing mechanism of the present invention;

[0023] Figure 3 This is a schematic diagram of the carton packaging machine of the present invention.

[0024] In the picture:

[0025] 1. Carton packaging machine; 11. Lifter; 2. End sealing mechanism; 21. Preheating soldering iron; 211. Protrusion; 22. Beauty soldering iron; 221. Mounting hole; 222. Heat-conducting surface; 223. Working surface; 23. Support; 24. Elastic steel sheet; 241. Fixed end; 242. Free end; 31. Waiting position; 32. First lifting position; 33. Second lifting position. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] This invention provides an end-face sealing mechanism 2 for a strip box packaging machine 1, the specific structure of which is as follows:

[0028] like Figure 2 and Figure 3 As shown, the carton packaging machine 1 includes a lifter 11, which sequentially lifts the carton from the waiting position 31 to the first lifting position 32 and then to the second lifting position 33. Figures 1 to 3As shown, the end-face sealing mechanism 2 is used to seal transparent paper onto the end face of the carton. It includes two soldering iron sets respectively located at both ends of the carton, and a bracket 23 for mounting the soldering iron sets. Each soldering iron set includes a preheating soldering iron 21 for sealing the carton at the first lifting position 32 and a beauty soldering iron 22 for sealing the carton at the second lifting position 33. The preheating soldering iron 21 and the beauty soldering iron 22 are arranged sequentially from bottom to top along the carton lifting direction and are both mounted on the bracket 23. The relative distance between the preheating soldering iron 21 and the end face of the carton is less than the distance between the beauty soldering iron 22 and the end face of the carton. The relative distance between the end faces of the carton; the preheating soldering iron 21 is connected to the bracket 23 through an elastic structure; when sealing the carton located at the first lifting position 32, the end face of the carton abuts against the preheating soldering iron 21 and pushes the preheating soldering iron 21 to move away from the carton, causing the elastic structure to undergo elastic deformation. During the deformation process, the elastic structure drives the preheating soldering iron 21 to apply lateral extrusion force to the carton and stores elastic force; when the carton overcomes the lateral extrusion force and leaves the first lifting position 32, the elastic structure releases the elastic force and drives the preheating soldering iron 21 to reset.

[0029] In this embodiment, a composite sealing process is formed by the upper and lower dual-station layout of the preheating soldering iron 21 and the beauty soldering iron 22, and the collaborative design of using an elastic structure for pressure compensation. This process can ensure the sealing effect of the overlapping area of ​​the transparent paper on the end face of the carton. During the sealing process, the end face of the strip box located at the first lifting position 32 abuts against the preheating soldering iron 21, pushing the preheating soldering iron 21 away from the strip box, causing the elastic structure to undergo elastic deformation. The elastic structure automatically compensates for the deformation, ensuring that the preheating soldering iron 21 remains in close contact with the end face of the strip box as it moves away from the first lifting position 32, avoiding problems such as missed sealing or insufficient local pressure. Furthermore, since the strip boxes are stacked and lifted, when a strip box is located at the first lifting position 32, another strip box being sealed by the beauty soldering iron 22 is simultaneously present at the second lifting position 33, providing vertical pressure to the strip box located at the first lifting position 32. The vertical pressure ensures the stability of the strip box during the lifting process, while the lateral elastic pressure allows the transparent paper to fully adhere to the end face of the strip box. The synergistic effect of both ensures the strong adhesion of the transparent paper, almost preventing any lifting. After the preheating soldering iron 21 completes the compaction and sealing of the overlapping area, the strip box enters the second lifting position 33, and the finishing soldering iron 22 smooths and beautifies the end face of the already hot-pressed strip box, ensuring a smooth and wrinkle-free appearance. Furthermore, because the preheating soldering iron 21 and the finishing soldering iron 22 are integrated into the existing stacking and lifting mode, they can adapt to the existing mass production rhythm, achieving a low-cost, non-disruptive upgrade of the equipment.

[0030] In some embodiments, the preheating soldering iron 21 has a sealing surface for sealing the strip box, and the sealing surface has a protrusion 211, which corresponds to the overlap position of the transparent paper overlapping area on the end face of the strip box. Figure 1 and Figure 2As shown, the sealing surface of the preheating soldering iron 21 is not flat, but spindle-shaped (i.e., the sealing surface has a raised center and a smooth transition at the edges). Its raised part 211 corresponds to the overlap position formed by the overlapping area of ​​the transparent paper on the end face of the carton (in actual products, the transparent paper overlap is usually located in the lower part of the center of the end face of the carton). This can concentrate the lateral extrusion force on the most critical position of the overlap, ensuring the heat seal strength.

[0031] The elastic structure can be a conventional elastic element in the art, such as an elastic steel sheet 24, a disc spring, or an elastic rubber block. Its core function is to provide a continuous and adaptive lateral compressive force to the preheated soldering iron 21 through elastic deformation. In this embodiment, as... Figure 2 As shown, the elastic structure includes an elastic steel sheet 24. The first segment of the elastic steel sheet 24 is connected to the bracket 23 to form a fixed end 241, and the second segment is connected to the preheating soldering iron 21 to form a free end 242. Both the fixed end 241 and the free end 242 are located on the same side of the elastic steel sheet 24. When the end face of the carton abuts against the preheating soldering iron 21, the elastic steel sheet 24 bends around the fixed end 241 to store elastic force. During use, the elastic recovery force generated when the elastic steel sheet 24 bends around the fixed end 241 can be converted into a lateral compressive force exerted by the preheating soldering iron 21 on the end face of the carton, and this compressive force can continue to act as the carton is lifted.

[0032] Sealing experiments were conducted using elastic steel sheets 24 with thicknesses of 1mm, 1.5mm, and 2mm. The experiments were carried out at a speed of 18 cartons / minute, with 100 cartons sampled each time for visual inspection in three separate trials. The results showed that when the steel sheet thickness was 1mm, 15 cartons were defective, accounting for 0.05% of the total 300 cartons; when the steel sheet thickness was 1.5mm, 4 cartons were defective, accounting for 0.013%; and when the steel sheet thickness was 2mm, there were no defective cartons. Furthermore, none of the 900 cartons tested exhibited uneven sealing at the end face. Therefore, a thickness of 2mm for the elastic steel sheet 24 is optimal, as this provides the best elasticity coefficient to ensure continuous adhesion between the preheating soldering iron 21 and the carton.

[0033] The four outer ribs of the preheating soldering iron 21 are all provided with chamfers for guiding the strip box, preferably rounded chamfers. During use, due to the elastic pressure, the strip box fits very tightly with the preheating soldering iron 21. The chamfer design is intended to prevent the strip box from being stuck by the preheating soldering iron 21 when entering or leaving the first lifting position 32, thus ensuring product quality.

[0034] The relative distance between the preheating soldering iron 21 and the end face of the carton is 0.7mm smaller than that between the cosmetic soldering iron 22 and the end face of the carton. This 0.7mm reduction in size compared to the cosmetic soldering iron 22 is designed to accommodate the deformation stroke of the elastic steel sheet 24, allowing the preheating soldering iron 21 to preferentially contact the end face of the carton when it reaches the first lifting position 32. It then continuously applies pressure to the overlapping area throughout the upward lifting process of the carton, ensuring the preheating soldering iron 21 effectively presses the transparent paper. When the carton size is small, this extension is sufficient to compensate for the gap caused by the negative dimensional deviation, ensuring that the preheating soldering iron 21 can still contact and apply pressure to the end face of the carton. When the carton size is large, the carton pushes the preheating soldering iron 21, causing the elastic structure to deform. The 0.7mm interference is converted into elastic deformation, preventing deformation of the carton or damage to the transparent paper due to excessive compression.

[0035] It should be clarified that, since the sealing surface of the preheating soldering iron 21 may have a protrusion 211 instead of being flat in some optional embodiments, while the working surface 223 of the beauty soldering iron 22 is usually flat, the "relative distance between the preheating soldering iron 21 and the end face of the pack is 0.7mm smaller than the relative distance between the beauty soldering iron 22 and the end face of the pack" mentioned here refers to the vertical distance between the part of the sealing surface of the preheating soldering iron 21 closest to the end face of the pack (i.e., the highest point of the sealing surface, or the apex of the protrusion 211 in embodiments with the protrusion 211) and the end face of the pack, which is 0.7mm smaller than the vertical distance between the part of the working surface 223 of the beauty soldering iron 22 closest to the end face of the pack and the end face of the pack.

[0036] like Figure 1 and Figure 2 As shown, the beauty soldering iron 22 includes a working part and a heat conduction part. The heat conduction part includes a mounting hole 221 for mounting a heating element and a heat-conducting surface 222. The end of the heating element is fitted into the mounting hole 221 and abuts against the heat-conducting surface 222. The working part includes a working surface 223, which is connected to the heat-conducting surface 222 and is further away from the mounting hole 221 than the heat-conducting surface 222. The heating element is preferably a nickel-chromium alloy heating wire. The end of the heating wire is fixed with a copper conductive terminal by a crimping method. The copper conductive terminal is fitted into the mounting hole 221, and its end face abuts tightly against the heat-conducting surface 222 to ensure the heat conduction effect. Furthermore, since the beauty soldering iron 22 is mainly responsible for the overall sealing and smoothing of the strip box end face, the heat transfer path from the heating element to the heat-conducting surface 222 and then to the working surface 223 can avoid the problem of inconsistent smoothing effect caused by heat concentration in a local area.

[0037] When sealing the carton located at the second lifting position 33, the working surface 223 abuts against the end face of the carton, and its center coincides with the center of the end face of the carton. The size of the working surface 223 is smaller than the size of the end face of the carton, which aims to focus on the flatness and beautification of the core area of ​​the end face of the carton, while avoiding the risk of burning the edge of the carton.

[0038] More preferably, the distance from the edge of the working surface 223 to its center is 1.5mm greater than the distance from the edge of the carton end face to its center, to accommodate minor tolerances in the end face dimensions. In this embodiment, the dimensions of the working surface 223 are 74.5mm*98.5mm, and the dimensions of the carton end face are 77.5mm*101.5mm.

[0039] like Figure 3 As shown, the present invention also provides a carton packaging machine 1, including an elevator 11 and an end-face sealing mechanism 2 as described above for the carton packaging machine 1.

[0040] The carton packaging machine 1 also includes a power source for driving the support 23 to move horizontally. When the power source drives the support 23 to move towards the position of the carton, the preheating soldering iron 21 abuts against the end face of the carton located at the first lifting position 32, and the cosmetic soldering iron 22 simultaneously abuts against the end face of the carton located at the second lifting position 33, so as to perform synchronous sealing. The power source can be a conventional linear drive element in the art, such as a cylinder, an electric cylinder, or a servo motor with a linkage mechanism, etc. Its installation position can be flexibly set according to the overall layout of the carton packaging machine 1, such as being set on the outside of the support 23, or in a reserved installation position on the frame of the carton packaging machine 1.

[0041] The carton packaging machine 1 also includes a PLC, which is electrically connected to the power source and the elevator 11. In use, the PLC controls the power source to drive the support 23 to move while the elevator 11 lifts the carton based on the carton station signal fed back by the elevator 11, so as to achieve timing matching between the sealing action and the carton conveying action.

[0042] The above-described contents can be implemented individually or in various combinations, and these variations are all within the protection scope of this invention.

[0043] In the description of this invention, it should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0044] In the description of this invention, it should also be noted that the terms "center," "upper," "lower," "front," "rear," "top," "bottom," "inner," and "outer," etc., 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 for 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. In the description of this invention, unless otherwise stated, "a number" means two or more.

[0045] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific embodiments of the present invention are limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such deductions or substitutions should be considered within the scope of protection of the present invention.

Claims

1. An end-face sealing mechanism for a carton packaging machine, used to seal transparent paper onto the end face of a carton, the carton packaging machine (1) including a lifter (11), the lifter (11) sequentially lifting the carton from a waiting position (31) to a first lifting position (32) and then to a second lifting position (33), characterized in that, The end-face sealing mechanism for the carton packaging machine includes two soldering iron sets respectively located at both ends of the carton, and a bracket (23) for mounting the soldering iron sets; the soldering iron sets include a preheating soldering iron (21) for sealing the carton located at the first lifting position (32) and a cosmetic soldering iron (22) for sealing the carton located at the second lifting position (33). The preheating soldering iron (21) and the cosmetic soldering iron (22) are arranged sequentially from bottom to top along the carton lifting direction, and the relative distance between the preheating soldering iron (21) and the end face of the carton is less than the relative distance between the cosmetic soldering iron (22) and the end face of the carton; the preheating soldering iron (21) and the cosmetic soldering iron (22) are arranged sequentially from bottom to top along the carton lifting direction, and the relative distance between the preheating soldering iron (21) and the end face of the carton is less than the relative distance between the cosmetic soldering iron (22) and the end face of the carton; the preheating soldering iron (21) and the cosmetic soldering iron (22) are arranged sequentially from bottom to top along the carton lifting direction. The hot soldering iron (21) is connected to the bracket (23) through an elastic structure. When the strip box located at the first lifting position (32) is sealed, the end face of the strip box abuts against the preheating soldering iron (21) and pushes the preheating soldering iron (21) to move away from the strip box, causing the elastic structure to undergo elastic deformation. During the deformation process, the elastic structure drives the preheating soldering iron (21) to apply lateral extrusion force to the strip box and stores elastic force. When the strip box overcomes the lateral extrusion force and leaves the first lifting position (32), the elastic structure releases the elastic force and drives the preheating soldering iron (21) to reset.

2. The end-face sealing mechanism for a carton packaging machine according to claim 1, characterized in that, The preheating soldering iron (21) is provided with a sealing surface for sealing the strip box. The sealing surface is provided with a protrusion (211), and the protrusion (211) corresponds to the overlap position of the transparent paper overlapping area on the end face of the strip box.

3. The end-face sealing mechanism for a carton packaging machine according to claim 1, characterized in that, The elastic structure includes an elastic steel sheet (24). The first section of the elastic steel sheet (24) is connected to the bracket (23) to form a fixed end (241), and the second section is connected to the preheating soldering iron (21) to form a free end (242). The fixed end (241) and the free end (242) are both located on the same side of the elastic steel sheet (24). When the end face of the strip box abuts against the preheating soldering iron (21), the elastic steel sheet (24) bends around the fixed end (241) to store elastic force.

4. The end-face sealing mechanism for a carton packaging machine according to claim 3, characterized in that, The thickness of the elastic steel sheet (24) is 2 mm.

5. The end-face sealing mechanism for a carton packaging machine according to claim 1, characterized in that, The relative distance between the preheating soldering iron (21) and the end face of the strip box is 0.7 mm smaller than the relative distance between the beauty soldering iron (22) and the end face of the strip box.

6. The end-face sealing mechanism for a carton packaging machine according to claim 1, characterized in that, The beauty soldering iron (22) includes a working part and a heat conduction part. The heat conduction part includes a mounting hole (221) for mounting a heating element and a heat conduction surface (222). The end of the heating element is inserted into the mounting hole (221) and abuts against the heat conduction surface (222). The working part includes a working surface (223) which is connected to the heat conduction surface (222) and is further away from the mounting hole (221) than the heat conduction surface (222).

7. The end-face sealing mechanism for a carton packaging machine according to claim 6, characterized in that, When sealing the strip box located at the second lifting position (33), the working surface (223) abuts against the end face of the strip box, and its center coincides with the center of the end face of the strip box; the size of the working surface (223) is smaller than the size of the end face of the strip box.

8. The end-face sealing mechanism for a carton packaging machine according to claim 7, characterized in that, The distance from the edge of the working surface (223) to its center is 1.5 mm greater than the distance from the edge of the end face of the carton to its center.

9. A carton packaging machine, comprising an elevator (11), characterized in that, It also includes an end-face sealing mechanism for a carton packaging machine as described in any one of claims 1-8.

10. The carton packaging machine according to claim 9, characterized in that, It also includes a power source for driving the support (23) to move horizontally; and a PLC electrically connected to the power source and to the lifter (11).

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