A capped folding welding device

Abstract

A top-sealing folding and welding device, belonging to the technical field of top-sealing and welding devices for packaging cartons, solves the problems of low processing efficiency, high equipment cost, large footprint, high energy consumption, high failure rate, and poor product quality stability in existing technologies. It includes a carton centering mechanism mounted on a top-sealing folding frame; a pre-folding mechanism and a folding extrusion mechanism are sequentially arranged above the centering mechanism along the carton conveying direction; a top-sealing welding mechanism is located on the side of the folding extrusion mechanism; a folding holding mechanism is located between the top-sealing welding mechanism and the folding extrusion mechanism; a top-sealing foam suction nozzle is located above the welding section of the top-sealing welding mechanism; and a foam liquid separation tank is located between the exhaust port of the foam suction fan and the top-sealing foam suction nozzle. Its design is reasonable, its structure is compact, its equipment integration is high, it saves space, and it has a low failure rate and saves energy, effectively improving processing efficiency and ensuring stable product quality.

Description

Technical Field

[0001] This invention belongs to the technical field of top folding and welding devices for packaging paper boxes, and specifically relates to a top folding and welding device. Background Technology

[0002] Currently, sealing and capping the top of brick-shaped cardboard boxes typically requires two sets of equipment: a folding and welding machine for sealing the top of the box, and a separate capping machine for welding the lid onto the outside of the top after sealing. This traditional method and equipment are not only inefficient in sealing and capping, but also costly, energy-intensive, and require a large footprint, have a high failure rate, and result in inconsistent product quality. Therefore, it is necessary to improve the existing equipment for folding and welding the top of cardboard boxes. Summary of the Invention

[0003] This invention addresses the aforementioned problems by providing a top-sealing bending welding device that features high equipment integration, space saving, low failure rate, energy conservation, and can effectively improve processing efficiency and ensure stable product quality.

[0004] The technical solution adopted in this invention is as follows: the capping folding and welding device includes a capping folding frame, characterized in that: a cardboard centering mechanism for centering and positioning the packaging cardboard on the cardboard conveying mechanism is provided on the capping folding frame; a pre-folding mechanism and a folding extrusion mechanism are sequentially arranged above the cardboard centering mechanism along the cardboard conveying direction; a capping welding mechanism is also provided on the side of the folding extrusion mechanism; and a folding holding mechanism is provided between the capping welding mechanism and the folding extrusion mechanism; a capping foam suction nozzle is provided above the welding part of the capping welding mechanism; the capping foam suction nozzle is connected to a foam suction fan through a foam suction pipe; and a foam liquid separation tank for temporarily storing foam is provided between the exhaust port of the foam suction fan and the capping foam suction nozzle.

[0005] The carton alignment mechanism includes carton alignment frames positioned on both sides of the packaging carton. An alignment cylinder is located on the side of the alignment frame furthest from the packaging carton. The cylinder body of the alignment cylinder is fixedly connected to the top folding frame, and the telescopic end of the alignment cylinder is connected to the carton alignment frame. Furthermore, two sets of paired carton alignment clamps are also provided on the side of the carton alignment frame closest to the packaging carton. A carton folding alignment cavity is provided between the two clamps in each pair. The telescopic movement of the alignment cylinder drives the carton alignment frame and the two sets of alignment clamps on it to reciprocate, thereby positioning and clamping the two packaging cars located below the pre-folding mechanism and the folding compression mechanism. This ensures the accurate positioning of the corresponding packaging cars during the pre-folding and compression processes performed by the pre-folding and folding compression mechanisms on the tops of the packaging cars below.

[0006] The pre-folding mechanism includes a vertically arranged pre-folding cylinder. The cylinder body is fixedly mounted on the top-sealed folding frame, and an L-shaped pre-folding plate is provided at the lower telescopic end of the pre-folding cylinder. The telescopic movement of the pre-folding cylinder drives the L-shaped pre-folding plate to pre-fold the top of the packaging box held by the carton centering mechanism.

[0007] The folding and extrusion mechanism includes a dual-axis extrusion cylinder, which is arranged horizontally perpendicular to the carton conveying direction. A front extrusion block and a rear extrusion block are respectively arranged opposite each other at both ends of the dual-axis extrusion cylinder. The upper side of the cylinder body of the dual-axis extrusion cylinder is connected to an extrusion cylinder connecting plate, and the extrusion cylinder connecting plate is connected to the telescopic end of the lower part of the extrusion connecting plate lifting cylinder, which is vertically arranged on the top folding frame. The extrusion cylinder connecting plate is also slidably connected to a guide rod sleeve fixedly installed on the top folding frame via an extrusion connecting plate lifting guide rod. The telescopic movement of the extrusion connecting plate lifting cylinder drives the extrusion cylinder connecting plate and the dual-axis extrusion cylinder thereon to reciprocate along the extrusion connecting plate lifting guide rod. The dual-axis extrusion cylinder drives the front and rear extrusion blocks, respectively located on the two telescopic ends, to move relative to or away from each other, thereby extruding and forming the top of the pre-folded packaging carton held by the centering mechanism.

[0008] The front and rear extrusion blocks have the same external structure, each including an extrusion block body. Each extrusion block body has a folded extrusion end face on the side facing the packaging box. Furthermore, the folded extrusion end face of the front extrusion block also has a lid avoidance notch in the middle. This allows the folded extrusion end faces on the front and rear extrusion blocks to extrude force on the pre-folded top of the packaging box. During the extrusion of the top of the packaging box, the lid avoidance notch on the front extrusion block prevents it from being pressed against the box lid.

[0009] The folding and retaining mechanism includes two sets of symmetrically arranged folding and retaining plates, with a folded top passage gap between the two sets of folding and retaining plates. This folded top passage gap between the two sets of folding and retaining plates helps maintain the shape of the pre-folded and compressed top of the packaging box, preventing loosening before welding, thus facilitating ultrasonic welding of the formed packaging box top by the subsequent sealing and welding mechanism.

[0010] The capping welding mechanism includes a capping welding frame, an ultrasonic transducer at one end of the frame, an ultrasonic welding head at the front end of the transducer, and a floating pressure sealing plate in front of the welding head. The floating pressure sealing plate is movably connected to the other end of the capping welding frame. A folded top welding space is provided between the ultrasonic welding head and the floating pressure sealing plate. The folded top welding space corresponds to the outlet position of the folded holding mechanism, and the capping foam nozzle is located directly above the folded top welding space. The ultrasonic transducer is also slidably mounted on a welding shifting slide rail via a welding shifting slide block. The welding shifting slide rail is arranged in a horizontal direction perpendicular to the carton conveying direction. The welding shifting slide block is connected to the telescopic end of a welding shifting cylinder. After the top of the pre-folded and compressed packaging carton exits from the folding and holding mechanism, a welding displacement cylinder drives the welding displacement slide, along with its ultrasonic transducer and ultrasonic welding head, to move forward along the welding displacement slide rail. The ultrasonic welding head, in conjunction with the floating sealing plate, ultrasonically welds and seals the top of the packaging carton within the folded top welding space. Before ultrasonic welding, a sealing foam nozzle can be used to apply negative pressure to the top of the packaging carton before sealing. If the filling material contains a lot of foam, the negative pressure from the sealing foam nozzle will remove any remaining foam from the top of the packaging carton. Even without foam, the negative pressure from the sealing foam nozzle creates a negative pressure environment in the top space of the packaging carton, resulting in a better, more aesthetically pleasing, and less bloated sealing effect. This also facilitates the subsequent forming of the top ear and ensures the quality of the welded seal.

[0011] The floating sealing plate includes a sealing plate body. The rear side of the sealing plate body is connected to a spherical groove at the end of the sealing welding frame via a hemispherical floating block. The front side of the sealing plate body has a sealing contact surface for contacting the ultrasonic welding head. Furthermore, a cover clearance space is provided on the sealing plate body behind the sealing contact surface. During the ultrasonic welding sealing process, the arc-shaped spherical connection structure between the hemispherical floating block of the sealing plate body and the spherical groove at the end of the sealing welding frame allows for flexible adjustment of the contact position between the floating sealing plate and the ultrasonic welding head, further improving welding quality.

[0012] The beneficial effects of this invention are as follows: Because this invention employs a cardboard box centering mechanism mounted on a top-sealed folding frame, a pre-folding mechanism and a folding extrusion mechanism are sequentially arranged above the cardboard box centering mechanism along the cardboard box conveying direction, a top-sealed welding mechanism is arranged on the side of the folding extrusion mechanism, and a folding holding mechanism is arranged between the top-sealed welding mechanism and the folding extrusion mechanism; a top-sealed foam suction nozzle is arranged above the welding part of the top-sealed welding mechanism, and the top-sealed foam suction nozzle is connected to a foam suction fan via a foam suction pipe; a foam liquid separation tank is arranged between the exhaust port of the foam suction fan and the top-sealed foam suction nozzle. Therefore, its design is reasonable, its structure is compact, its equipment integration is high, it saves space, its equipment failure rate is low, it saves energy, and it can effectively improve processing efficiency and ensure stable product quality. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of one structure of the present invention.

[0014] Figure 2 yes Figure 1 A partial structural diagram of the lower part of the structure.

[0015] Figure 3 yes Figure 2 A schematic diagram of the connection structure of the paper box centering mechanism, pre-folding mechanism and folding extrusion mechanism.

[0016] Figure 4 yes Figure 3 A-direction view.

[0017] Figure 5 yes Figure 3 A schematic diagram of a cardboard box centering mechanism.

[0018] Figure 6 yes Figure 3 A schematic diagram of the front extrusion block and the rear extrusion block in a process.

[0019] Figure 7 yes Figure 2 A schematic diagram of a connection structure between the capping welding mechanism and the folding retaining mechanism in the design.

[0020] Figure 8 yes Figure 7 View B.

[0021] Figure 9 yes Figure 8 The C-direction view.

[0022] Explanation of the numbers in the diagram: 1. Top-sealing folding frame; 2. Carton centering mechanism; 3. Pre-folding mechanism; 4. Folding and extrusion mechanism; 5. Folding holding mechanism; 6. Top-sealing welding mechanism; 7. Top-sealing foam suction nozzle; 8. Foam suction pipeline; 9. Foam suction fan; 10. Foam liquid separator; 11. Packaging carton; 12. Centering cylinder; 13. Carton centering frame; 14. Pre-folding cylinder; 15. 16 L-shaped pre-folded plate, 17 extrusion cylinder connecting plate, 18 dual-axis extrusion cylinder, 19 front extrusion block, 20 rear extrusion block, 21 extrusion connecting plate lifting cylinder, 22 extrusion connecting plate lifting guide rod, 23 carton centering plate, 24 carton folding centering cavity, 25 extrusion block body, 26 folded extrusion end face, 27 lid clearance notch, 28 folded retaining plate, 29 folded top through gap, 30 sealing welding frame, 31 ultrasonic transducer, 32 floating sealing plate, 33 ultrasonic welding head, 34 folded top welding space, 35 welding shift slide, 36 welding shift slide rail, 37 welding shift cylinder, 38 sealing plate body, 39 sealing contact surface, 40 lid clearance space, 41 hemispherical floating block, 42 ​​spherical groove, 43 carton position sensor. Detailed Implementation

[0023] according to Figures 1-9 The specific structure of the present invention is described in detail below. The capped folding welding device includes a capped folding frame 1, on which a carton centering mechanism 2 is provided for centering and positioning the packaging carton 11 on the carton conveying mechanism. The carton centering mechanism 2 includes carton centering frames 13 arranged on the front and rear sides of the packaging carton 11 on the carton conveying mechanism. Centering cylinders 12 are respectively arranged on the side of the carton centering frame 13 away from the packaging carton 11. The cylinder body of the centering cylinder 12 is fixedly connected to the capped folding frame 1, and the telescopic end of the centering cylinder 12 is connected to the carton centering frame 13. On the side of the carton centering frame 13 closest to the packaging carton 11, two sets of paired (four in total, two in a group) carton centering clamps 22 are respectively arranged. Between the two carton centering clamps 22 in each pair, a carton folding centering cavity 23 for holding the packaging carton 11 is respectively provided. Furthermore, by extending and retracting the centering cylinder 12, the carton centering frame 13 and the two sets of carton centering clamps 22 on it are driven to move back and forth, so as to position and clamp the two packaging cartons 11 located below the pre-folding mechanism 3 and the folding and pressing mechanism 4 respectively, thereby maintaining the positional accuracy of the corresponding packaging cartons 11 during the pre-folding mechanism 3 and the folding and pressing mechanism 4 pre-folding and pressing the top of the packaging cartons 11 below them respectively.

[0024] Above the carton centering mechanism 2, along the carton conveying direction, are sequentially arranged a pre-folding mechanism 3 and a folding and pressing mechanism 4 for performing step-by-step forming operations on the top of the packaging carton 11. The pre-folding mechanism 3 includes a vertically arranged pre-folding cylinder 14, the cylinder body of which is fixedly mounted on the top folding frame 1. An L-shaped pre-folding plate 15 is provided at the telescopic end of the lower part of the pre-folding cylinder 14. Thus, the telescopic movement of the pre-folding cylinder 14 drives the L-shaped pre-folding plate 15 to pre-fold the top of the packaging carton 11 held by the carton centering mechanism 2. The folding and pressing mechanism 4 includes a dual-axis pressing cylinder 17 (clamping cylinder), which is arranged in a horizontal direction perpendicular to the carton conveying direction. The dual-axis pressing cylinder 17 is located at both ends of the front and rear sides of the packaging carton 11, with a front pressing block 18 and a rear pressing block 19 arranged opposite to each other. The front extrusion block 18 and the rear extrusion block 19 have the same external structure. Both the front extrusion block 18 and the rear extrusion block 19 include an extrusion block body 24. The extrusion block body 24 is provided with a folded extrusion end face 25 on the side facing the packaging carton 11. The folded extrusion end face 25 of the front extrusion block 18 is also provided with a lid avoidance notch 26 in the middle. The folded extrusion end faces 25 on the front extrusion block 18 and the rear extrusion block 19 are used to extrude the top of the packaging carton 11 after pre-folding. In the process of extruding the top of the packaging carton 11, the lid of the packaging carton 11 is avoided by the lid avoidance notch 26 provided on the front extrusion block 18.

[0025] The upper side of the cylinder body of the dual-axis extrusion cylinder 17 is connected to the extrusion cylinder connecting plate 16, which is connected to the telescopic end of the extrusion connecting plate lifting cylinder 20, which is vertically arranged on the top folding frame 1. Furthermore, the extrusion cylinder connecting plate 16 is also slidably connected to the guide rod sliding sleeve fixedly installed on the top folding frame 1 via the vertically arranged extrusion connecting plate lifting guide rod 21. Thus, by extending and retracting the extrusion connecting plate lifting cylinder 20, the extrusion cylinder connecting plate 16 and the dual-axis extrusion cylinder 17 on it are driven to reciprocate along the extrusion connecting plate lifting guide rod 21. The dual-axis extrusion cylinder 17 drives the front extrusion block 18 and the rear extrusion block 19, respectively installed on the two telescopic ends, to move relative to or away from each other, thereby extruding and forming the top of the packaging carton 11, which has been pre-folded and held by the centering mechanism.

[0026] A sealing welding mechanism 6 is also provided on the outer side of the folding and extrusion mechanism 4 along the carton conveying direction. A sealing foam suction nozzle 7 is provided above the welding part of the sealing welding mechanism 6. The sealing foam suction nozzle 7 is connected to the foam suction fan 9 through the foam suction pipe 8. A foam liquid separation tank 10 for temporarily storing foam is provided between the exhaust port of the foam suction fan 9 and the sealing foam suction nozzle 7. A drain port is also provided at the bottom of the foam liquid separation tank 10. At the same time, a folding holding mechanism 5 is provided between the sealing welding mechanism 6 and the folding and extrusion mechanism 4. The folding holding mechanism 5 includes two sets of symmetrically arranged folding holding plates 27. A folding top passage gap 28 is provided between the two sets of folding holding plates 27. The folding top passage gap 28 provided between the two sets of folding holding plates 27 is used to maintain the shape of the top of the pre-folded and extruded packaging carton 11 and prevent loosening before welding, so that the sealing welding mechanism 6 can perform ultrasonic welding on the top of the formed packaging carton 11.

[0027] The sealing welding mechanism 6 includes a sealing welding frame 29. An ultrasonic transducer 30 is provided at one end of the sealing welding frame 29. An ultrasonic welding head 32 is provided at the front end of the ultrasonic transducer 30 facing the packaging carton 11. A floating sealing plate 31 is also provided in front of the ultrasonic welding head 32. The floating sealing plate 31 is composed of a sealing plate body 37. The rear side of the sealing plate body 37 is connected to the spherical groove 41 provided at the other end of the sealing welding frame 29 through a hemispherical floating block 40. A sealing contact surface 38 for contacting the ultrasonic welding head 32 is provided on the front side of the sealing plate body 37. Furthermore, a lid clearance space 39 is provided on the sealing plate body 37 and behind the sealing contact surface 38. Furthermore, during the ultrasonic welding sealing process, the arc-shaped spherical connection structure between the hemispherical floating block 40 of the sealing plate body 37 and the spherical groove 41 at the end of the sealing welding frame 29 is used to flexibly adjust the contact position between the floating sealing plate 31 and the ultrasonic welding head 32, thereby improving the welding quality.

[0028] Furthermore, a folded top welding space 33 is provided between the ultrasonic welding head 32 and the floating sealing plate 31. The folded top welding space 33 corresponds to the outlet position of the folded top through the gap 28 of the folded holding mechanism 5, and the sealing foam nozzle 7 is located directly above the folded top welding space 33. The ultrasonic transducer 30 is also slidably mounted on two welding shift slides 35 via a welding shift slide 34. The two welding shift slides 35 are arranged in a horizontal direction perpendicular to the carton conveying direction, and the welding shift slide 34 is connected to the telescopic end of the welding shift cylinder 36. A carton position sensor 42 is also provided on the rear side of the floating sealing plate 31 and at the end of the sealing welding frame 29 for determining the position of the packaging carton 11 and sending control signals to the sealing welding mechanism 6. After the top of the pre-folded and compressed packaging carton 11 exits from the outlet position of the folding and holding mechanism 5, the welding displacement cylinder 36 drives the welding displacement slide 34, along with the ultrasonic transducer 30 and ultrasonic welding head 32, to move forward along the welding displacement slide rail 35. The ultrasonic welding head 32 and the floating sealing plate 31 then work together to ultrasonically weld and seal the top of the packaging carton 11 within the folded top welding space 33. Furthermore, before ultrasonic welding, the sealing foam nozzle 7 can be used to apply negative pressure to the top of the packaging carton 11 before sealing. If there is a lot of foam in the filling material, the negative pressure of the sealing foam nozzle 7 will remove the remaining foam from the top of the packaging carton 11. Even without foam, the negative pressure of the sealing foam nozzle 7 can create a negative pressure environment in the top space of the packaging carton 11, resulting in a better, more aesthetically pleasing, and non-expanding sealing effect. This also facilitates the subsequent forming of the top ear and ensures the quality of the welded seal.

[0029] When using this top-sealing folding and welding device, firstly, the packaging carton 11, after being covered by the top welding cap and filled with materials, moves along the carton conveying mechanism to below the pre-folding mechanism 3. Then, the carton conveying mechanism temporarily stops, and the centering cylinder 12 of the carton centering mechanism 2 extends, thereby driving the carton centering frame 13 and the two sets of carton centering clamps 22 on it to position and clamp the packaging carton 11 located below the pre-folding mechanism 3 (and below the folding and pressing mechanism 4). Afterward, the pre-folding cylinder 14 of the pre-folding mechanism 3 extends downward, driving the L-shaped pre-folding plate 15 to pre-fold the top of the packaging carton 11 held by the carton centering mechanism 2. Subsequently, the centering cylinder 12 of the carton centering mechanism 2 is retracted, the packaging carton 11 is released, and the carton conveying mechanism continues to convey forward one carton distance, allowing the pre-folded packaging carton 11 to move forward to below the folding and pressing mechanism 4. Then, the carton centering mechanism 2 clamps the pre-folded packaging carton below the folding and extrusion mechanism 4 again (at the same time, the carton centering mechanism 2 also clamps a newly delivered packaging carton below the pre-folding mechanism 3 to prepare for pre-folding); then, the extrusion connecting plate lifting cylinder 20 extends downward, allowing the extrusion cylinder connecting plate 16 and the dual-axis extrusion cylinder 17 on it to descend to the extrusion height along the extrusion connecting plate lifting guide rod 21, and retracts the dual-axis extrusion cylinder 17 of the folding and extrusion mechanism 4, thereby driving the front extrusion block 18 and the rear extrusion block 19 respectively set on the two telescopic ends to move inward and relative to each other, using the folding and extrusion end faces 25 on the front extrusion block 18 and the rear extrusion block 19 to extrude and form the top of the packaging carton 11 that has been pre-folded and clamped by the centering mechanism.

[0030] After the top of the formed packaging box 11 is moved forward by the box conveying mechanism to the bottom of the sealing welding mechanism 6, the top shape of the packaging box 11 is maintained by the gap 28 between the two sets of folding retaining plates 27 of the folding retaining mechanism 5, so as to facilitate ultrasonic welding of the top of the formed packaging box 11. After the top of the packaging box 11, which has been pre-folded and squeezed, comes out from the outlet position of the folding retaining mechanism 5, the foam material remaining on the top of the packaging box 11 during the previous filling is first removed by the sealing foam suction nozzle 7; then, the welding displacement cylinder 36 of the sealing welding mechanism 6 extends and drives the welding displacement slide 34 and the ultrasonic transducer 30 and ultrasonic welding head 32 on it to move forward along the welding displacement slide rail 35, so that the top of the packaging box 11 in the folded top welding space 33 is ultrasonically welded and sealed by the cooperation of the ultrasonic welding head 32 and the floating pressure sealing plate 31.

Claims

1. A capping bending welding device, comprising a capping bending frame (1), characterized in that: The top-sealing folding frame (1) is provided with a carton centering mechanism (2) for centering and positioning the packaging carton (11) on the carton conveying mechanism. Above the carton centering mechanism (2) and along the carton conveying direction, a pre-folding mechanism (3) and a folding extrusion mechanism (4) are arranged in sequence. The side of the folding extrusion mechanism (4) is also provided with a top-sealing welding mechanism (6), and a folding holding mechanism (5) is provided between the top-sealing welding mechanism (6) and the folding extrusion mechanism (4). A top-sealing foam suction nozzle (7) is provided above the welding part of the top-sealing welding mechanism (6). The foam suction nozzle (7) is connected to the foam suction fan (9) through the foam suction pipe (8). A foam liquid separation tank (10) for temporary foam storage is provided between the exhaust port of the foam suction fan (9) and the capping foam suction nozzle (7). The capping welding mechanism (6) includes a capping welding frame (29). An ultrasonic transducer (30) is provided at one end of the capping welding frame (29). An ultrasonic welding head (32) is provided at the front end of the ultrasonic transducer (30). A floating pressure sealing plate (31) is also provided in front of the ultrasonic welding head (32). The floating pressure sealing plate (31) and the capping welding head (6) are connected to the capping welding machine (9). The other end of the top welding frame (29) is movably connected; a folded top welding space (33) is provided between the ultrasonic welding head (32) and the floating pressure sealing plate (31), the folded top welding space (33) corresponds to the outlet position of the folded holding mechanism (5), and the top foam suction nozzle (7) is located directly above the folded top welding space (33); the ultrasonic transducer (30) is also slidably mounted on the welding displacement slide rail (35) via the welding displacement slide block (34), the welding displacement slide rail (35) is arranged in a horizontal direction perpendicular to the carton conveying direction, and the The welding displacement slide (34) is connected to the telescopic end of the welding displacement cylinder (36); the floating pressure sealing plate (31) includes a pressure sealing plate body (37), the rear side of the pressure sealing plate body (37) is connected to the spherical groove (41) provided at the end of the sealing welding frame (29) through a hemispherical floating block (40), the front side of the pressure sealing plate body (37) is provided with a pressure sealing contact surface (38) for contacting the ultrasonic welding head (32), and a cover clearance space (39) is also provided on the pressure sealing plate body (37) and behind the pressure sealing contact surface (38).

2. The capping folding welding device according to claim 1, characterized in that: The carton centering mechanism (2) includes a carton centering frame (13) set on both sides of the packaging carton (11). A centering cylinder (12) is set on the side of the carton centering frame (13) away from the packaging carton (11). The cylinder body of the centering cylinder (12) is fixedly connected to the top folding machine frame (1). The telescopic end of the centering cylinder (12) is connected to the carton centering frame (13). Furthermore, two sets of paired carton centering plates (22) are also set on the side of the carton centering frame (13) close to the packaging carton (11). A carton folding centering cavity (23) is set between the two carton centering plates (22) of each pair.

3. The capping folding welding device according to claim 1, characterized in that: The pre-folding mechanism (3) includes a vertically arranged pre-folding cylinder (14). The cylinder body of the pre-folding cylinder (14) is fixedly mounted on the top-sealed folding frame (1), and an L-shaped pre-folding plate (15) is provided at the telescopic end of the lower part of the pre-folding cylinder (14).

4. The capping folding welding device according to claim 1, characterized in that: The folding and extrusion mechanism (4) includes a dual-axis extrusion cylinder (17). The dual-axis extrusion cylinder (17) is arranged in a horizontal direction perpendicular to the paper box conveying direction. The two ends of the dual-axis extrusion cylinder (17) are respectively provided with a front extrusion block (18) and a rear extrusion block (19) arranged opposite to each other. The upper side of the cylinder body of the dual-axis extrusion cylinder (17) is connected to the extrusion cylinder connecting plate (16). The extrusion cylinder connecting plate (16) is connected to the telescopic end of the lower part of the extrusion connecting plate lifting cylinder (20) arranged vertically on the top folding frame (1). The extrusion cylinder connecting plate (16) is also slidably connected to the guide rod sliding sleeve fixedly provided on the top folding frame (1) through the extrusion connecting plate lifting guide rod (21).

5. The capping folding welding device according to claim 4, characterized in that: The front extrusion block (18) and the rear extrusion block (19) have the same external structure. Both the front extrusion block (18) and the rear extrusion block (19) include an extrusion block body (24). The extrusion block body (24) is provided with a folded extrusion end face (25) on the side facing the packaging box (11). Furthermore, the folded extrusion end face (25) of the front extrusion block (18) is also provided with a box cover avoidance notch (26) in the middle.

6. The capping folding welding device according to claim 1, characterized in that: The folded retaining mechanism (5) includes two sets of symmetrically arranged folded retaining plates (27), and a folded top passage gap (28) is provided between the two sets of folded retaining plates (27).

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