Packaging production line

Abstract

The invention discloses a packaging production line in the field of paper box forming, and the packaging production line comprises a conveying station which is used for pushing a double-layer blank piece and pulling the double-layer blank piece to form a paper box; the conveying station is in butt joint with the second rack, and the second rack is provided with a transmission device used for conveying paper boxes; a first limiting assembly used for limiting side lugs of a paper box is arranged on the second machine frame, the first limiting assembly is arranged in the arrangement direction of the transmission device in a matched mode, and a pre-forming station, a folding station and a sealing station are linearly arranged on the second machine frame. The paper box moves along the first limiting assembly and sequentially passes through the pre-forming station, the folding station and the sealing station to obtain a sealed paper box; according to the paper box sealing device, after the double-layer blank pieces are formed into paper boxes through the conveying station, the paper boxes are continuously conveyed to the second rack, and when the paper box sealing device is used, the paper boxes on the second rack pass through the pre-forming station, the folding station and the sealing station, and the efficient box sealing process can be completed.

Description

Technical Field

[0001] The present application relates to the technical field of paper box forming, and in particular to a packaging production line. Background Art

[0002] A paper box is a three-dimensional shape, which is composed of a polyhedral shape formed by the movement, stacking, folding and encirclement of several surfaces. The surfaces in the three-dimensional structure play the role of dividing the space in space. Cutting, rotating and folding the surfaces in different parts will result in different emotional expressions. Existing paper boxes are all made into unfolding structures or folding structures. Both structures make the paper box a sheet-like blank, which needs to be processed later to become a paper box. The most commonly used paper box packaging form is the plug-in bottom seal type. The prepared paper box is a flattened double-layer blank. When packaging the product, it is necessary to manually unfold the double-layer blank to form a cavity in the middle to accommodate the product. After a series of folding, the paper box is sealed and packaged. The manual operation efficiency of this process is very low, and there are many defects on the surface of the packaged product, which cannot guarantee the final quality control. Some automatic production lines cannot achieve complete product packaging. How to overcome such technical difficulties is what technicians need to overcome. Summary of the invention

[0003] The purpose of the present application is to provide a packaging production line to solve the problems of low packaging efficiency and inability to achieve mechanized production in the prior art.

[0004] In order to achieve the above objectives, this application is implemented by adopting the following technical solutions: The present application discloses a packaging production line, which comprises: A conveying station, which is used to push and pull the double-layer embryo sheet to form a paper box; A second frame, the conveying station is connected to the second frame, and a transmission device for conveying paper boxes is provided on the second frame; The second frame is provided with a first limiting component for limiting the side ears of the paper box, and the first limiting component is matched and arranged along the arrangement direction of the transmission device. The second frame is linearly arranged with a preforming station, a folding station and a sealing station. When working, the preforming station pre-folds the creases on the paper box, the folding station is used to gather and fold the box body of the paper box, and the sealing station is used for sealing the paper box; the paper box moves along the first limiting component and passes through the preforming station, folding station and sealing station in sequence to obtain a sealed paper box.

[0005] According to a further solution of the present application, the conveying station includes a conveying line and a stretching device that are connected to each other; a plurality of double-layer embryo sheets are arranged on the conveying line for transmission, and the stretching device is fixed on the second frame, and the stretching device includes an arc plate, a limit plate and a power cylinder; the power cylinder is fixed on the second frame, and a suction cup is installed on the output of the power cylinder through a connecting wall, and the arc plate and the limit plate are vertically and spaced apart and fixed at one end of the conveying line close to the second frame, and the arc plate, the limit plate and the conveying line form a gradual deformation zone, and the suction cup pulls the double-layer embryo sheet along the deformation zone, and is squeezed and unfolded by the deformation zone.

[0006] In a further solution of the present application, the preforming station comprises a flattening device, at least one pre-folding device and a shaping device; The flattening device, pre-folding device and shaping device are linearly arranged in sequence along the length direction of the first limiting component, and the flattening device is arranged close to the stretching device; the flattening device is used to flatten the bottom of the carton, the pre-folding device is used to pre-fold the creases on the carton body, and the shaping device is used for pre-processing the final state of the carton.

[0007] In a further solution, the flattening device comprises a flattening cylinder, the flattening cylinder is fixed on the second frame, and the output end of the flattening cylinder is vertically arranged and fixed with a flattening block through a connecting piece; The pre-folding device includes a lifting cylinder and a shaping cylinder, which are fixed in sequence on a second frame around the first limiting component, and the pre-folding cylinder is horizontally fixed on the telescopic rod of the lifting cylinder, and claws are installed at both ends of the pre-folding cylinder; a telescopic cylinder is fixed on the second frame on one side of the shaping cylinder, and an abutment frame is fixed on the telescopic rod of the telescopic cylinder, and a shaping block is fixed on the telescopic rod of the shaping cylinder, and a shaping angle matching the forming shape of the paper box is provided at one end of the shaping block away from the shaping cylinder.

[0008] A further solution also includes an auxiliary workstation, which is arranged relative to the pre-folding device. The auxiliary workstation includes a limit plug plate. A rodless cylinder is fixed on the second frame, and the output end of the rodless cylinder fixes the limit plug plate through a support.

[0009] In a further solution of the present application, the folding station includes a vertical cylinder, a tightening assembly and a second limit assembly fixed to the second frame; The output end of the vertical cylinder is equipped with two paddles through a transversely arranged double-headed cylinder. The tightening assembly is arranged below the second limit assembly, and the limit spacing at the end close to the preforming station gradually decreases along the processing direction, the limit spacing at the end of the first limit assembly close to the conveying station gradually increases along the processing direction, and the limit spacing of the second limit assembly is smaller than the limit spacing of the first limit assembly.

[0010] According to a further solution, the first limiting assembly includes two first limiting rods arranged in parallel, and the two first limiting rods are arranged in a "straight eight" shape at one end close to the conveying station; the second limiting assembly includes two second limiting rods arranged in parallel, and the spacing between the two second limiting rods is smaller than the spacing between the two first limiting rods; the tightening assembly includes two tightening rods arranged in parallel, and the two tightening rods are arranged in a "straight eight" shape at one end close to the preforming station.

[0011] In a further solution of the present application, the sealing station includes a glue dispenser and two pressing cylinders; The glue dispensing machine is fixed on the second frame, the two pressing cylinders are installed on both sides of the transmission device, a slide seat is slidably arranged above each pressing cylinder, a sealing cylinder is relatively arranged on each slide seat, an extrusion block is fixed on the output end of each sealing cylinder, and clamping parts on the side of the paper box are arranged on the opposite surfaces of the two slide seats; the two clamping parts are forced to constrain the side edges of the finished paper box, and the two extrusion blocks are forced to seal the side ears on both sides of the paper box.

[0012] According to a further solution of the present application, the transmission device comprises transmission wheels which are rotatably mounted on the second frame at intervals, a transmission chain body is provided between the two transmission wheels, and a plurality of paper box seats are equidistantly fixed on the transmission chain body.

[0013] According to a further solution of the present application, the conveying station is arranged vertically to the second frame.

[0014] The beneficial effects of this application are: In the present application, a conveying station and a second frame are provided. After the conveying station forms the double-layer embryonic sheet into a paper box, the paper box is continuously transported to the transmission device of the second frame to speed up the speed of forming the paper box. When in use, the paper box on the second frame can complete the efficient box sealing process after the operations of the preforming station, folding station and sealing station. In actual production, a machine gripper is provided after the folding station to put the product into the paper box. The device can realize a fast assembly line packaging process, mechanical unified operation, ensure the uniformity of folding or sealing of the paper box, and realize high-quality production operation.

[0015] Among them, the tightening component and the second limit component in the sealing station, during the final sealing process of the carton, the tightening component guides and tightens the two sides of the carton. At this time, the two second limit rods of the second limit component limit the side ears to close, which is convenient for sequential dispensing operations, greatly improves the speed of automated production, and cleverly solves the problem of mis-dispensing when dispensing the carton. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1This is a schematic diagram of the packaging production line from a first perspective in an embodiment of the present application; Figure 2 This is a schematic diagram of the packaging production line from a second perspective in an embodiment of the present application; Figure 3 This is a schematic diagram of the structure of the conveying station in the embodiment of the present application; Figure 4 This application is to embody the structural schematic diagram of the stretching device; Figure 5 for Figure 4 Enlarged view of point A in the middle; Figure 6 This is a schematic diagram of the structure of the sealing station in this application; Figure 7 for Figure 6 The enlarged view of point B in the middle; Figure 8 This is a schematic diagram of the structure of the packaging production line in the embodiment of the present application after the conveying station is removed; Fig. 9 This is a schematic diagram of the structure of the front section of the second rack in an embodiment of the present application; Fig.10 for Fig. 9 Enlarged view of point C in the middle.

[0017] in: 1. Conveying station; 2. Preforming station; 3. First limiting assembly; 4. Auxiliary station; 5. Folding station; 7. Sealing station; 8. Second rack; 81. Carton seat; 100. Double-layer embryo sheet; 11. Conveying line; 12. Stretching device; 21. Flattening device; 22. Pre-folding device; 23. Shaping device; 24. Detection device; 31. First limiting rod; 111. First rack; 112. Limiting seat; 113. Synchronous belt; 114. Pushing block; 121. Connecting wall; 122. Power cylinder; 123. Curved plate; 124. Limiting Plate; 125, suction cup; 211, flattening cylinder; 212, connecting piece; 213, flattening block; 221, lifting cylinder; 222, pre-folding cylinder; 223, claw; 231, shaping cylinder; 232, telescopic cylinder; 233, shaping block; 234, abutment frame; 235, shaping angle; 71, glue dispenser; 72, pressing cylinder; 73, sealing cylinder; 74, extrusion block; 75, slide seat; 76, tightening assembly; 77, second limit assembly; 51, vertical cylinder; 52, paddle; 761, tightening rod; 771, second limit rod. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present application and its application or use.

[0019] like Figure 1 and Figure 2 As shown, in this embodiment, a conveying station 1, a preforming station 2, a folding station 5, a sealing station 7 and a second frame 8 are disclosed, wherein the conveying station 1 is used to push and pull the double-layer embryo sheet 100 to form a paper box, the conveying station 1 is connected to the second frame 8, and a transmission device for transmitting the paper box is provided on the second frame 8. The preforming station 2, the folding station 5, and the sealing station 7 are linearly and sequentially arranged on the second frame 8 on both sides of the transmission device. A first limiting assembly 3 for limiting the side ears of the paper box is also fixed on the frame, and the first limiting assembly 3 is matched and arranged along the arrangement direction of the transmission device. The preforming station 2 pre-folds the creases on the paper box, the folding station 5 is used to fold the box body of the paper box, and the sealing station 7 is used for sealing the paper box; the paper box moves along the first limiting assembly 3 and passes through the preforming station 2, the folding station 5 and the sealing station 7 in sequence to obtain a sealed paper box. The structure of the unfolded paper box and the double-layer embryo sheet 100 in this embodiment can be observed in the attached Figure 3 and Figure 7 The corresponding position in .

[0020] Normally, the bottom fork folding plates of the paper box are pre-folded during the production of the double-layer embryo sheet 100. When the side surfaces of the double-layer embryo sheet 100 are pulled, the bottom fork folding plates will adaptively cross to completely seal the bottom. In this embodiment, the output end of the conveying station 1 is arranged vertically to the input end of the rotating device.

[0021] When in use, the conveying station 1 continuously pushes the double-layer embryo sheet 100 to the second frame 8, and unfolds the paper box by pulling. The two side ears of the paper box are separated by the first limiting component 3, avoiding interference with subsequent processes. The unfolded paper box is transported by the transmission device, passes through the preforming station 2 and the folding station 5 in turn and is processed at their respective work stations. In actual production, a robot can be installed before the sealing station 7 to place products in the paper box, and finally seal them one by one through the sealing station 7 to complete the automatic packaging operation of the product.

[0022] As attached Figures 3 to 5In this embodiment, the conveying station 1 includes a conveying line 11 and a stretching device 12 that are connected to each other; a plurality of double-layer embryo sheets 100 are arranged on the conveying line 11 for transmission, and the stretching device 12 is fixed on the second frame 8. The stretching device 12 includes an arc plate 123, a limit plate 124 and a power cylinder 122; the power cylinder 122 is fixed on the second frame 8, and the power cylinder 122 outputs a suction cup 125 installed through a connecting wall 121. Here, in order to facilitate the movement of the suction cup 125, the connecting wall 121 is designed to be "L-shaped", and the arc plate 123 and the limit plate 124 are vertically and spacedly fixed on the conveying line 11. Near one end of the second frame 8, the arc plate 123, the limit plate 124 and the conveyor line 11 form a gradual deformation zone, and the suction cup 125 pulls the double-layer embryo sheet 100 along the deformation zone, which is squeezed and unfolded by the deformation zone; when the stretching device 12 is working, the suction cup 125 can be connected to the negative pressure machine, and contact the outer double-layer embryo sheet 100 under the drive of the power cylinder 122. The double-layer embryo sheet 100 is sucked by the suction cup 125 and is pulled into the deformation zone under the drive of the power cylinder 122 again. During the process, the distance between the arc plate 123 and the limit plate 124 gradually decreases until the double-layer embryo is squeezed and unfolded, completing the active unfolding action.

[0023] In this embodiment, the conveyor line 11 includes a first frame 111, on which a liftable mounting seat is provided, a rotating synchronous belt 113 is provided in the mounting seat, a push block 114 is fixed to the synchronous belt 113, anti-slip rods are provided on both sides of the mounting seat in the length direction, and a limit seat 112 is provided at one end of the anti-slip rod close to the power cylinder 122, and a plurality of double-layer embryo sheets 100 are placed between the limit seat 112 and the push block 114. As the number of double-layer embryo sheets 100 decreases, the synchronous belt 113 is driven by a motor to reduce the distance between the push block 114 and the limit seat 112 to prevent the double-layer embryo sheets 100 from tipping over, thereby ensuring that the equipment can operate continuously.

[0024] In a further embodiment, a screw is threadedly installed on the first frame 111, and guide rods are vertically welded at the four corners of the mounting seat. The guide rods are inserted into the guide holes of the mounting seat. The screw passes through the bottom of the first frame 111 and is rotatably connected to the bottom surface of the mounting seat. The overall height of the mounting seat is adjusted by rotating the screw to adapt to the height of the second frame 8.

[0025] As attached Figures 8 to 10 In this embodiment, the preforming station 2 includes a flattening device 21, two pre-folding devices 22 and a shaping device 23; Among them, the flattening device 21, the pre-folding device 22 and the shaping device 23 are linearly arranged in sequence along the length direction of the first limiting component 3, and the flattening device 21 is arranged close to the stretching device 12; the flattening device 21 is used for flattening the bottom of the carton to increase the unfolding degree of the carton, the pre-folding device 22 is used for the pre-folding function of the creases on the carton body, and the shaping device 23 is used for pre-processing of the final state of the carton.

[0026] As attached Fig. 9 As shown, in this embodiment, the flattening device 21 includes a flattening cylinder 211, which is fixed on the second frame 8. Normally, the output end of the flattening cylinder 211 is placed vertically, and the output end of the flattening cylinder 211 is vertically arranged and fixed with a flattening block 213 through a connecting piece 212. The connecting frame here is "L-shaped", and the long rod end of the connecting frame is vertically arranged and connected to the flattening block 213. The flattening cylinder 211 is started to extend the flattening block 213 into the carton to flatten the bottom of the carton, so that the carton can be unfolded more completely.

[0027] The pre-folding device 22 includes a lifting cylinder 221 and a shaping cylinder 231. The lifting cylinder 221 and the shaping cylinder 231 have a flattening cylinder 211 which is sequentially fixed to the second frame 8 around the first limit assembly 3 at the sealing station 7. The telescopic rod of the lifting cylinder 221 is fixed horizontally with a pre-folding cylinder 222, and claws 223 are installed at both ends of the pre-folding cylinder 222; the two claws 223 on the pre-folding cylinder 222 are provided with a socket, which is used to accommodate the edge of the carton. The lifting cylinder 221 is started to drive the claws 223 to descend. At this time, the distance between the two claws 223 is set according to the distance between the mouths of the carton. The edge of the carton is inserted into the socket of the claws 223, and the pre-folding cylinder 222 is started to move the claws 223 back and forth, so that the opening of the carton is propped open and a certain degree of crease pre-folding effect is achieved. In a further embodiment, the attached Fig. 9 The pre-folding device 22 is equipped with an auxiliary station 4. The auxiliary station 4 and the pre-folding device 22 are arranged opposite to each other. The two are distributed on both sides of the first limiting component 3. The auxiliary station 4 includes a limiting plug plate. A rodless cylinder is fixed on the second frame 8. The output end of the rodless cylinder fixes the limiting plug plate through a support. When in use, the insert wall of the limiting plug plate is placed at both ends of the paper box to prevent the excessive displacement of the pre-folding cylinder 222 from damaging the paper box.

[0028] A telescopic cylinder 232 is fixed on the second frame 8 on one side of the shaping cylinder 231, and an abutment frame 234 is fixed on the telescopic rod of the telescopic cylinder 232. A shaping block 233 is fixed on the telescopic rod of the shaping cylinder 231. The shaping block 233 is provided with a shaping angle 235 matching the molding shape of the paper box at one end away from the shaping cylinder 231. When in use, the telescopic cylinder 232 drives the shaping block 233 to be placed on both sides of the paper box, and the shaping cylinder 231 drives the shaping block 233 into the paper box. During the shaping process, the shaping angle 235 moves along the fold of the paper box, and finally contacts the bottom wall of the paper box to form a support, thereby increasing the flexibility of the fold and facilitating subsequent folding and sealing.

[0029] In some other embodiments, a detection device 24 is further provided behind the shaping device 23. The detection device 24 includes an industrial camera fixed above the first limit assembly 3. The industrial camera uploads data to the control terminal by taking pictures. The control terminal displays whether the carton is unfolded. The unfolded carton is taken out by a manipulator. Similarly, a manipulator is added later to cooperate with the product to be placed in the opened carton, such as a pacifier, a baby bottle, food, and a small toy, etc. Industrial cameras can be installed on the production line according to demand to judge the status of the carton and the product in the carton, and reduce the occurrence of missing or insufficient packaging.

[0030] As attached Figure 6 and Figure 7 In this embodiment, the folding station 5 includes a vertical cylinder 51 fixed on the second frame 8, a tightening assembly 76 and a second limiting assembly 77; the output end of the vertical cylinder 51 is equipped with two paddles 52 through a horizontally arranged double-headed cylinder, and the spacing between the two paddles 52 is reduced, and the paper box will deform along the reserved fold. The tightening assembly 76 is arranged below the second limiting assembly 77, and the limiting spacing at one end close to the preforming station 2 gradually decreases along the processing direction, and the limiting spacing at one end of the first limiting assembly 3 close to the conveying station 1 gradually increases along the processing direction, and the limiting spacing of the second limiting assembly 77 is smaller than the limiting spacing of the first limiting assembly 3.

[0031] As attached Figure 7 and Fig. 9 As shown, in this embodiment, the first limiting assembly 3 includes two first limiting rods 31 arranged in parallel, and the two first limiting rods 31 are arranged in a "straight eight" shape at one end close to the conveying station 1; the second limiting assembly 77 includes two second limiting rods 771 arranged in parallel, and the distance between the two second limiting rods 771 is smaller than the distance between the two first limiting rods 31; the tightening assembly 76 includes two tightening rods 761 arranged in parallel, and the two tightening rods 761 are arranged in a "straight eight" shape at one end close to the preforming station 2. After the suction cup 125 drags and unfolds the double-layer embryo sheet 100, the side ears on the paper box will retain the tendency to close in the initial state. Under the guidance and constraint of the first limiting rod 31, the two side ears are suppressed until the paper box moves to the second limiting rod 771. Under the guidance and constraint of the second limiting rod 771, the box body at the lower part of the side ears will be close to each other and folded along the crease. During the folding process, the side ears of the paper box are constrained again by the second limiting rod 771 and are in a broken apart state, which is convenient for the next step of gluing operation.

[0032] The sealing station 7 in this embodiment includes a glue dispenser 71 and two pressing cylinders 72; the glue dispenser 71 is fixed on the second frame 8 by a bracket, and the two pressing cylinders 72 are installed on both sides of the transmission device, and a slide seat 75 is slidably arranged above each pressing cylinder 72, and a sealing cylinder 73 is relatively arranged on each slide seat 75, and an extrusion block 74 is fixed on the output end of each sealing cylinder 73, and a clamping part on the side of the paper box is arranged on the opposite surface of the two slide seats 75; the two clamping parts are subjected to force to constrain the side edges of the finished paper box, and the two extrusion blocks 74 are subjected to force to seal the side ears on both sides of the paper box; when in use, the paper box coming out of the two tightening rods 761 is abutted and pressed by the clamping part, and the pressing cylinder 72 is started to drive the extrusion block 74 to perform the pressing operation, and the two side ears are bonded. Usually, hot melt glue is used for dispensing, and the glue cools down quickly after the two side ears are pressed, so as to achieve a fast sealing effect; the final sealed paper box is dropped into the collection frame at the tail of the equipment by a robot or directly dropped.

[0033] The transmission device in this embodiment includes transmission wheels installed on the second frame 8 for rotation at intervals, a transmission chain body is provided between the two transmission wheels, and a plurality of paper box seats 81 are fixed on the transmission chain body at equal intervals. The technology is relatively mature and will not be described here. The paper box seat 81 is used to receive the stretched paper box.

[0034] Specifically in use: A plurality of double-layer embryo sheets 100 are installed between the limiting seat 112 and the push block 114, and the power cylinder 122 is started to drive the suction cup 125 to contact and absorb the outer double-layer embryo sheet 100, and the power cylinder 122 drives the suction cup 125 to pull the double-layer embryo sheet 100 through the deformation zone between the arc plate 123 and the limiting plate 124 to move and unfold the double-layer embryo sheet 100; The unfolded paper box is placed in the paper box seat 81 on the transmission device. With the transmission of the transmission device, the paper in the paper box seat 81 is processed by the flattening block 213, supported by the claws 223, and shaped by the shaping block 233; Then, the processed paper box is moved to the vertical cylinder 51, pre-folded by the paddle 52, and folded along the tightening component 76 and the second limit component 77, and moved to the sealing station 7 after glue dispensing; The two extrusion blocks 74 on the sealing station 7 are bonded and sealed to the side ears of the paper box.

[0035] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", etc. are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, "multiple" means two or more.

[0036] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood by specific circumstances.

Claims

1. A packaging production line, characterized in that: include: A conveying station (1), wherein the conveying station (1) is used to push the double-layer embryo sheet (100) and pull the double-layer embryo sheet (100) to form a paper box; a second frame (8), the conveying station (1) and the second frame (8) being connected to each other, and a transmission device for conveying paper boxes is provided on the second frame (8); The second frame (8) is provided with a first limiting component (3) for limiting the side ears of the paper box. The first limiting component (3) is matched and arranged along the arrangement direction of the transmission device. The second frame (8) is linearly arranged with a preforming station (2), a folding station (5) and a sealing station (7). When working, the preforming station (2) pre-folds the crease on the paper box, the folding station (5) is used to fold the box body of the paper box, and the sealing station (7) is used to seal the paper box. The paper box moves along the first limiting component (3) and passes through the preforming station (2), the folding station (5) and the sealing station (7) in sequence to obtain a sealed paper box.

2. The packaging production line according to claim 1, characterized in that: The conveying station (1) comprises a conveying line (11) and a stretching device (12) which are arranged in a butt connection; a plurality of double-layer embryo sheets (100) are arranged on the conveying line (11) for transmission; the stretching device (12) is fixed on the second frame (8); the stretching device (12) comprises an arc plate (123), a limit plate (124) and a power cylinder (122); the power cylinder (122) is fixed on the second frame (8); a suction cup (125) is installed at the output of the power cylinder (122) through a connecting wall (121); the arc plate (123) and the limit plate (124) are vertically and spaced apart and fixed at one end of the conveying line (11) close to the second frame (8); the arc plate (123), the limit plate (124) and the conveying line (11) form a gradual deformation zone; the suction cup (125) pulls the double-layer embryo sheets (100) along the deformation zone, and is squeezed and unfolded by the deformation zone.

3. The packaging production line according to claim 1, characterized in that: The preforming station (2) comprises a flattening device (21), at least one pre-folding device (22) and a shaping device (23); The flattening device (21), the pre-folding device (22), and the shaping device (23) are linearly arranged in sequence along the length direction of the first limiting component (3), and the flattening device (21) is arranged close to the stretching device (12); the flattening device (21) is used for flattening the bottom of the paper box, the pre-folding device (22) is used for pre-folding folds on the paper box body, and the shaping device (23) is used for pre-processing the final state of the paper box.

4. The packaging production line according to claim 3, characterized in that: The flattening device (21) comprises a flattening cylinder (211), the flattening cylinder (211) being fixed on the second frame (8), the output end of the flattening cylinder (211) being arranged vertically and being fixed with a flattening block (213) via a connecting piece (212); The pre-folding device (22) comprises a lifting cylinder (221) and a shaping cylinder (231). The lifting cylinder (221) and the shaping cylinder (231) are sequentially fixed on a second frame (8) around the first limit assembly (3). The telescopic rod of the lifting cylinder (221) is horizontally fixed with a pre-folding cylinder (222). Both ends of the pre-folding cylinder (222) are provided with claws (223). The telescopic cylinder (232) is fixed on the second frame (8) on one side of the shaping cylinder (231). The telescopic rod of the telescopic cylinder (232) is fixed with an abutment frame (234). The telescopic rod of the shaping cylinder (231) is fixed with a shaping block (233). The shaping block (233) is provided with a shaping angle (235) matching the forming shape of the paper box at one end away from the shaping cylinder (231).

5. The packaging production line according to claim 3, characterized in that: It also includes an auxiliary station (4), the auxiliary station (4) and the pre-folding device (22) are arranged relative to each other, the auxiliary station (4) includes a limit plug plate, a rodless cylinder is fixed on the second frame (8), and the output end of the rodless cylinder is fixed to the limit plug plate via a support.

6. The packaging production line according to claim 1, characterized in that: The folding station (5) comprises a vertical cylinder (51) fixed on the second frame (8), a tightening assembly (76) and a second limiting assembly (77); The output end of the vertical cylinder (51) is equipped with two paddles (52) via a transversely arranged double-headed cylinder. The tightening assembly (76) is arranged below the second limit assembly (77), and the limit spacing of the end close to the preforming station (2) gradually decreases along the processing direction. The limit spacing of the end of the first limit assembly (3) close to the conveying station (1) gradually increases along the processing direction. The limit spacing of the second limit assembly (77) is smaller than the limit spacing of the first limit assembly (3).

7. The packaging production line according to claim 6, characterized in that: The first limiting assembly (3) comprises two first limiting rods (31) arranged in parallel, and one end of the two first limiting rods (31) close to the conveying station (1) is arranged in a "straight figure eight" shape; the second limiting assembly (77) comprises two second limiting rods (771) arranged in parallel, and the distance between the two second limiting rods (771) is smaller than the distance between the two first limiting rods (31); the tightening assembly (76) comprises two tightening rods (761) arranged in parallel, and one end of the two tightening rods (761) close to the preforming station (2) is arranged in a "straight figure eight" shape.

8. The packaging production line according to claim 1, characterized in that: The sealing station (7) comprises a glue dispenser (71) and two pressing cylinders (72); The glue dispenser (71) is fixed on the second frame (8), and the two pressing cylinders (72) are installed on both sides of the transmission device. A slide seat (75) is slidably arranged above each pressing cylinder (72), and a sealing cylinder (73) is arranged opposite to each slide seat (75). An extrusion block (74) is fixed on the output end of each sealing cylinder (73). Clamping parts for the side of the paper box are arranged on the opposite surfaces of the two slide seats (75); the two clamping parts are used to constrain the side edges of the finished paper box, and the two extrusion blocks (74) are used to seal the side ears on both sides of the paper box.

9. The packaging production line according to claim 1, characterized in that: The transmission device comprises transmission wheels which are rotatably mounted on the second frame (8) at intervals, a transmission chain body is provided between the two transmission wheels, and a plurality of paper box seats (81) are fixed on the transmission chain body at equal intervals.

10. The packaging production line according to any one of claims 1 to 9, characterized in that: The conveying station (1) and the second frame (8) are arranged vertically.

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