A folding device and folding method for transparent paper boxes

Abstract

This invention discloses a folding device and method for transparent paper on carton packaging, belonging to the field of tobacco packaging machinery technology. The device includes a machine housing and a rotating mechanism, an upper folding mechanism, and a lower folding mechanism mounted on the housing. The upper and lower folding mechanisms are located on the same side of the rotating mechanism, with the upper folding mechanism positioned above the lower folding mechanism. First, the upper folding mechanism folds the upper long edge of the transparent paper onto the right side of the carton to be processed. Then, the lower folding mechanism folds the lower long edge of the transparent paper onto the upper long edge. The actuators of the upper and lower folding mechanisms then move upwards synchronously a certain distance, ensuring that the upper and lower long edges of the transparent paper are completely adhered to the right side of the carton to be processed. This effectively eliminates gaps and ensures that the transparent paper covering the outer surface of the carton after heat sealing is stretched and taut, avoiding wrinkles and improving the heat sealing quality and appearance of the transparent paper on the carton.

Description

Technical Field

[0001] This invention relates to a folding device and folding method for transparent paper in tobacco carton packaging, belonging to the technical field of tobacco packaging machinery. Background Technology

[0002] Many paper-boxed products are wrapped with a layer of transparent paper, which provides some protection and enhances the appearance of the packaging. In the tobacco industry, in addition to these two functions, transparent paper on cigarette boxes also prevents the cigarettes from getting damp. For cartons of cigarettes, a sealing layer of transparent paper is also required. In traditional equipment, because transparent paper is thin and easily bent, the packaging paper often wrinkles, affecting the product's appearance. Furthermore, the most crucial step in this process is sealing the long edges of the transparent paper; however, this process frequently results in loosening and slippage, disrupting production.

[0003] To address this, Chinese patent document CN216709827U discloses a device for folding the long side of the transparent paper on cigarette packs. When the receiving cavity at the feeding position begins to move clockwise upwards, the upper long side of the cigarette pack inside is interfered with by the left edge of the sealing plate, causing the upper long side to fold downwards. Prior to this, the folding blade swings upwards, folding the lower long side of the transparent paper upwards, creating a tendency to surround the cigarette pack, and is always pressed against the left side of the cigarette pack by the action of the folding blade. Finally, the upper long side folded downwards by the folding blade will cover the lower long side already pressed against the left side of the cigarette pack, and together they enter the area between the sealing plate and the rotating wheel.

[0004] The device limits the upper and lower long sides by the inner surface of the sealing plate, keeping them overlapping. However, since the inner surface of the sealing plate is an arc and the left side of the cigarette pack is a flat surface, there is inevitably a large gap between the inner surface of the sealing plate and the left side of the cigarette pack. This causes the transparent paper to become loose and wrinkle-prone when the hot-sealing assembly presses down on the upper and lower long sides to hot-seal. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention provides a folding device for transparent paper in a carton and a folding method thereof.

[0006] This invention is achieved through the following technical solution:

[0007] A folding device for transparent paper boxes includes a chassis and a rotating mechanism, an upper folding mechanism, and a lower folding mechanism disposed on the chassis. The upper folding mechanism and the lower folding mechanism are located on the same side of the rotating mechanism, and the upper folding mechanism is located above the lower folding mechanism.

[0008] The rotary mechanism includes a support sleeve, a rotating sleeve, and a forming wheel. The support sleeve is fixedly mounted on the machine housing. The rotating sleeve is coaxially mounted inside the support sleeve and rotatably connected to the support sleeve. One end of the rotating sleeve is provided with a gear A. One end of the forming wheel is fixedly connected to the end of the rotating sleeve away from the gear A. An even number of receiving cavities are evenly distributed at intervals on the circumference of the forming wheel.

[0009] On each side of the circumference of each cavity, there is an adsorption tube on the forming wheel, and multiple air holes are opened on the adsorption tube.

[0010] The device also includes a feeding mechanism, part of which is located inside the forming wheel and the other part extends into the machine housing.

[0011] The pushing mechanism includes a mounting sleeve, a transmission shaft, and a support frame. The mounting sleeve is installed inside the machine housing. A servo motor is installed inside the mounting sleeve. The output shaft of the servo motor extends outside the mounting sleeve, and a gear B is installed on the output shaft of the servo motor.

[0012] The middle part of the drive shaft is connected to the housing through bushing A, and one end of the drive shaft is provided with gear C that meshes with gear B, and the other end is provided with gear D;

[0013] The support frame is fixedly connected to the support sleeve at the end away from the chassis. A gear shaft is rotatably installed inside the support frame. One end of the gear shaft is equipped with a gear E, which meshes with a gear D. The other end of the gear shaft is equipped with a gear F. A bar box inlet rack and a bar box outlet rack are slidably installed inside the support frame. The bar box inlet rack meshes with a gear F, and the bar box outlet rack meshes with a gear D. A positioning block is provided at one end of the bar box inlet rack, and a push plate is provided at the end of the bar box outlet rack away from the positioning block.

[0014] The upper folding mechanism includes a rectangular frame A, a lifting frame A, and a drive assembly. The rectangular frame A is mounted on the chassis, the lifting frame A is slidably connected to the rectangular frame A, and the bottom of the lifting frame A is provided with a folding plate A. The drive assembly is mounted on the chassis or the rectangular frame A and is connected to the lifting frame A.

[0015] The driving component is a linear module.

[0016] The lower folding mechanism includes a transmission assembly and a lower folding assembly. The transmission assembly includes a torque input shaft and a crank arm. The torque input shaft is connected to the housing through a bushing B, and a swing arm is fixedly provided at one end of the torque input shaft. The middle part of the crank arm is rotatably connected to the housing. One end is rotatably connected to the end of the swing arm away from the torque input shaft through a connecting rod, and a rocker arm is rotatably connected to the other end.

[0017] The lower folding assembly includes a rectangular frame B, a lifting frame B, and a folding plate B. The rectangular frame B is mounted on the chassis, the lifting frame B is slidably connected to the rectangular frame B, and the lifting frame B is rotatably connected to the end of the rocker arm away from the crank arm. The folding plate B is located on top of the lifting frame B.

[0018] The folding mechanism is equipped with a heat sealing component.

[0019] The hot-sealing assembly includes a cylinder and a movable frame. The cylinder is mounted on the lifting frame B. The middle part of the movable frame is rotatably connected to the lifting frame B via a rotating shaft, and the upper part of the movable frame is connected to the lifting frame B via a compression spring. The lower end of the movable frame abuts against the piston rod of the cylinder, and the upper end is provided with a hot-sealing plate, which is located inside the mounting cavity formed by the folding plate B and the lifting frame B.

[0020] A folding device and method for folding transparent paper for a carton includes the following steps:

[0021] A. Apply negative pressure to the suction tubes on both sides of a certain cavity on the forming wheel to attract a section of transparent paper sent by the host computer. Then the forming wheel rotates counterclockwise. When the cavity covered by the transparent paper rotates to a horizontal position and the opening faces to the right, the forming wheel stops rotating.

[0022] B. The pushing mechanism operates, pushing the strip box out of the receiving cavity, which is located horizontally and faces left, from the forming wheel while in contact with the transparent paper. When the external force pushes the strip box to be processed into contact with the transparent paper and the pushing mechanism clamps the strip box to be processed, positive pressure is applied to the suction tube that holds the transparent paper, causing the transparent paper to separate from the suction tube. Then, the pushing mechanism, with the help of the external force, introduces the strip box to be processed into the receiving cavity covered by the transparent paper. During this process, the transparent paper naturally wraps the strip box to be processed.

[0023] C. Folding plate A moves downwards, folding the upper long side of the transparent paper onto the right side of the strip box to be processed. Then, folding plate B moves upwards to contact folding plate A, folding the lower long side of the transparent paper onto the upper long side. Next, folding plate A moves upwards to reset, and folding plate B moves upwards synchronously at the same speed as folding plate A until the hot-sealing plate moves to the middle position of the strip box to be processed and then stops moving upwards.

[0024] D. The cylinder repeatedly pushes the piston rod out and retracts, driving the hot-sealing plate to repeatedly pat the right side of the strip box to be processed, completing the hot-sealing work on the upper and lower long sides of the strip box to be processed.

[0025] E. The forming wheel rotates counterclockwise by one station, and steps A to D are repeated to complete the hot sealing work of the remaining strip boxes to be processed one by one.

[0026] The beneficial effects of this invention are as follows:

[0027] 1. First, the upper long edge of the transparent paper is folded to the right side of the carton to be processed by the upper folding mechanism. Then, the lower long edge of the transparent paper is folded to the upper long edge by the lower folding mechanism. Then, the actuators of the upper and lower folding mechanisms move upwards synchronously for a certain distance, so that the upper and lower long edges of the transparent paper are completely attached to the right side of the carton to be processed. The right side of the carton to be processed, the upper long edge of the transparent paper, the lower long edge of the transparent paper, and the actuator of the lower folding mechanism are in contact with each other, which can effectively eliminate gaps and ensure that the transparent paper covering the outer surface of the carton after hot sealing is stretched and taut, avoiding wrinkles and improving the hot sealing quality and appearance of the carton transparent paper.

[0028] 2. By using a positioning block in conjunction with external force to clamp the strip box to be processed, the strip box is introduced into the receiving cavity. On the one hand, this allows for precise control of the depth of the strip box entering the receiving cavity, achieving the purpose of positioning the strip box. This further ensures that the relative position of the right side of the strip box to be processed with folding plates A and B remains unchanged, ultimately guaranteeing the folding effect of folding plates A and B on the upper and lower long sides of the transparent paper. On the other hand, when the positioning block and external force clamp the strip box to be processed, the positioning block first presses the middle part of the transparent paper against the left side of the strip box to be processed, preventing the transparent paper from sliding against the strip box to be processed, and ensuring that the transparent paper is stretched out and covers the left, upper, lower, and right sides of the strip box to be processed.

[0029] 3. The same pushing mechanism is used to introduce the strip box to be processed into the receiving cavity on the forming wheel, and to push the strip box that has been heat-sealed out of the forming wheel, which improves the structural compactness of the device.

[0030] 4. As the piston rod of the cylinder repeatedly extends and retracts, the hot-sealing plate repeatedly presses the overlapping area of ​​the upper and lower long sides of the transparent paper to hot-seal and beautify the appearance of the carton, effectively ensuring the quality of the carton's appearance. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of the present invention;

[0032] Figure 2 for Figure 1 A schematic diagram of the structure after the rotary mechanism and the pushing mechanism have been removed;

[0033] Figure 3 This is an assembly drawing of the rotary mechanism and the feeding mechanism of the present invention;

[0034] Figure 4 for Figure 3 A structural diagram from another perspective;

[0035] Figure 5 This is a schematic diagram of the feeding mechanism of the present invention;

[0036] Figure 6This is a schematic diagram of the upper folding mechanism of the present invention;

[0037] Figure 7 for Figure 6 A structural diagram from another perspective;

[0038] Figure 8 This is a schematic diagram of the assembly structure of the lower folding component and the hot-sealing component of the present invention;

[0039] Figure 9 for Figure 8 A structural diagram from another perspective;

[0040] Figure 10 This is a schematic diagram of the structure to be processed according to the present invention.

[0041] In the diagram: 1-Chassis, 2-Rotating mechanism, 20-Forming wheel, 21-Support sleeve, 22-Receiving cavity, 23-Suction tube, 24-Rotating sleeve, 25-Gear A, 3-Pushing mechanism, 300-Mounting sleeve, 301-Servo motor, 302-Shaft sleeve A, 303-Drive shaft, 304-Gear B, 305-Gear C, 306-Support frame, 307-Gear D, 308-Gear F, 309-Strip box guide rack, 310-Positioning block, 311-Strip box ejection rack, 312- 4-Push plate, 5-Upper folding mechanism, 6-Rectangular frame A, 7-Lifting frame A, 8-Folding plate A, 9-Lower folding mechanism, 10-Transmission assembly, 11-Torque input shaft, 12-Swing arm, 13-Connecting rod, 14-Crank arm, 15-Rock arm, 16-Lower folding assembly, 17-Rectangular frame B, 18-Lifting frame B, 19-Folding plate B, 10-Hot sealing assembly, 11-Cylinder, 12-Rotating shaft, 13-Moving frame, 14-Hot sealing plate, 15-Compression spring, 16-Transparent paper. Detailed Implementation

[0042] The technical solution of the present invention is further described below, but the scope of protection is not limited to what is described.

[0043] like Figures 1 to 10 As shown, the present invention provides a folding device for transparent paper boxes, comprising a housing 1 and a rotating mechanism 2, an upper folding mechanism 4, and a lower folding mechanism 5 mounted on the housing 1. The upper folding mechanism 4 and the lower folding mechanism 5 are located on the same side of the rotating mechanism 2, and the upper folding mechanism 4 is located above the lower folding mechanism 5. Figure 10In use, the upper long side of the transparent paper 7 is first folded onto the right side of the carton to be processed by the upper folding mechanism 4, and then the lower long side of the transparent paper 7 is folded onto the upper long side by the lower folding mechanism 5. Then, the actuators of the upper folding mechanism 4 and the lower folding mechanism 5 move upwards synchronously for a certain distance, so that the upper and lower long sides of the transparent paper 7 are completely attached to the right side of the carton to be processed. The right side of the carton to be processed, the upper long side of the transparent paper 7, the lower long side of the transparent paper 7 and the actuator of the lower folding mechanism 5 are in contact with each other, which can effectively eliminate gaps and ensure that the transparent paper 7 covering the outer surface of the carton after hot sealing is stretched and taut, avoiding wrinkles and improving the hot sealing quality and appearance of the transparent paper 7 of the carton.

[0044] The rotary mechanism 2 includes a support sleeve 21, a rotating sleeve 24, and a forming wheel 20. The support sleeve 21 is fixedly installed on the housing 1. The rotating sleeve 24 is coaxially installed inside the support sleeve 21 and rotatably connected to the support sleeve 21. A gear A25 is installed at one end of the rotating sleeve 24. One end of the forming wheel 20 is fixedly connected to the end of the rotating sleeve 24 away from the gear A25. Four receiving cavities 22 are evenly distributed at intervals on the circumference of the forming wheel 20. In use, a servo motor A is installed in the housing 1. A gear G is installed on the output shaft of the servo motor A. The gear G meshes with the gear A25. The servo motor A transmits torque to the forming wheel 20 through the gear G, the gear A25, and the rotating sleeve 24, driving the forming wheel 20 to rotate counterclockwise intermittently.

[0045] On each side of the circumference of each receiving cavity 22, there is an adsorption tube 23 installed on the forming wheel 20, and multiple air vents are opened on the adsorption tube 23. In use, the adsorption tube 23 is connected to the compressed air storage tank and vacuum pump through the pipeline. Whether positive pressure or negative pressure is supplied to the adsorption tube 23 is controlled and switched by the valve.

[0046] The device also includes a pushing mechanism 3, part of which is located inside the forming wheel 20 and the other part extends into the housing 1.

[0047] The pushing mechanism 3 includes a mounting sleeve 300, a transmission shaft 303 and a support frame 306. The mounting sleeve 300 is installed inside the housing 1. A servo motor 301 is installed inside the mounting sleeve 300. The output shaft of the servo motor 301 extends outside the mounting sleeve 300, and a gear B304 is installed on the output shaft of the servo motor 301.

[0048] The middle part of the drive shaft 303 is connected to the housing 1 through the bushing A302, and one end of the drive shaft 303 is equipped with a gear C305 that meshes with the gear B304, and the other end is equipped with a gear D307.

[0049] The support frame 306 is fixedly connected to the end of the support sleeve 21 away from the chassis 1. A gear shaft is rotatably mounted inside the support frame 306. Gear E is mounted on one end of the gear shaft, and gear E meshes with gear D307. Gear F308 is mounted on the other end of the gear shaft. A carton inlet rack 309 and a carton outlet rack 311 are slidably mounted inside the support frame 306. The carton inlet rack 309 meshes with gear F308, and the carton outlet rack 311 meshes with gear D307. A positioning block 310 is mounted on one end of the carton inlet rack 309, and a push plate 312 is mounted on the end of the carton outlet rack 311 away from the positioning block 310. Figure 5 As shown, when the output shaft of the servo motor 301 rotates clockwise by a certain angle, the servo motor 301 transmits torque to the gear D307 through gears B304, C305, and the transmission shaft 303, causing the gear D307 to rotate counterclockwise. The gear D307 drives the strip box ejection rack 311 to gradually retract into the support frame 306 for reset. At the same time, the gear D307 transmits torque to the gear F308 through gear E and the gear shaft, causing the gear F308 to rotate clockwise. The gear F308 drives the strip box introduction rack 309 to gradually retract into the support frame 306 for reset. The positioning block 310, in conjunction with the external force, clamps the strip box to be processed and introduces it into the receiving cavity 22. The depth of the strip box entering the receiving cavity 22 is positioned by the distance the positioning block 310 moves to the left, which can be controlled by adjusting the clockwise rotation angle of the output shaft of the servo motor 301. Therefore, by using the positioning block 310 in conjunction with external force to clamp the strip box to be processed, the strip box to be processed is introduced into the receiving cavity 22. On the one hand, the depth of the strip box entering the receiving cavity 22 can be precisely controlled to achieve the purpose of positioning the strip box. This further ensures that the relative position of the right side of the strip box to be processed with the folding plate A42 and folding plate B512 remains unchanged, ultimately ensuring the folding effect of folding plate A42 and folding plate B512 on the upper and lower long sides of the transparent paper 7. On the other hand, when the positioning block 310 clamps the strip box to be processed in conjunction with external force, the positioning block 310 first presses the middle part of the transparent paper 7 against the left side of the strip box to be processed, preventing the transparent paper 7 from sliding against the strip box to be processed, and ensuring that the transparent paper 7 is stretched out and covers the left, upper, lower and right sides of the strip box to be processed.

[0050] Similarly, when the output shaft of the servo motor 301 rotates counterclockwise by a certain angle, the gear D307 rotates clockwise. The gear D307 drives the strip box ejection rack 311 to gradually extend out of the support frame 306, so that the strip box in the receiving cavity 22, which is located in a horizontal position and has an opening facing left, is ejected out of the forming wheel 20 by the push plate 312 at the end of the strip box ejection rack 311. At the same time, the gear F308 rotates counterclockwise, and the gear F308 drives the strip box introduction rack 309 to gradually extend out of the support frame 306, so that the positioning block 310 extends to the position of contacting the transparent paper 7, waiting to cooperate with the external force again to introduce the next strip box to be processed into the receiving cavity 22.

[0051] The upper folding mechanism 4 includes a rectangular frame A40, a lifting frame A41, and a drive assembly. The rectangular frame A40 is mounted on the chassis 1, the lifting frame A41 is slidably connected to the rectangular frame A40, and a folding plate A42 is mounted on the bottom of the lifting frame A41. The drive assembly is mounted on the chassis 1 or the rectangular frame A40 and is connected to the lifting frame A41.

[0052] The driving component is a linear module (not shown in the figure). The linear module drives the lifting frame A41 and the folding plate A42 to move up and down. When the folding plate A42 moves down, the long side of the transparent paper 7 is folded, and when it moves up, it is reset.

[0053] The lower folding mechanism 5 includes a transmission assembly 50 and a lower folding assembly 51. The transmission assembly 50 includes a torque input shaft 501 and a crank arm 504. The torque input shaft 501 is connected to the housing 1 through a bushing B, and a swing arm 502 is fixedly installed at one end of the torque input shaft 501. The middle part of the crank arm 504 is rotatably connected to the housing 1. One end is rotatably connected to the end of the swing arm 502 away from the torque input shaft 501 through a connecting rod 503, and the other end is rotatably connected to a rocker arm 505.

[0054] The lower folding assembly 51 includes a rectangular frame B510, a lifting frame B511, and a folding plate B512. The rectangular frame B510 is mounted on the chassis 1. The lifting frame B511 is slidably connected to the rectangular frame B510, and the lifting frame B511 is rotatably connected to the end of the rocker arm 505 away from the crank arm 504. The folding plate B512 is mounted on top of the lifting frame B511. Figure 2 As shown, during use, a servo motor B is installed inside the chassis 1. The output shaft of the servo motor B is connected to the torque input shaft 501 through a coupling. The servo motor B transmits torque to the crank arm 504 through the coupling, torque input shaft 501, swing arm 502 and connecting rod 503, causing the crank arm 504 to swing back and forth around its rotation connection point with the chassis 1. During the back and forth swinging process, the rocker arm 505 pushes and pulls the lifting frame B511 and the folding plate B512 up and down. When the folding plate B512 moves up, the lower long side of the transparent paper 7 is folded; when it moves down, it is reset.

[0055] The folding mechanism 5 is equipped with a heat sealing component 6.

[0056] The hot-sealing assembly 6 includes a cylinder 60 and a movable frame 62. The cylinder 60 is mounted on the lifting frame B511. The middle part of the movable frame 62 is rotatably connected to the lifting frame B511 via a rotating shaft 61, and the upper part of the movable frame 62 is connected to the lifting frame B511 via a compression spring 64. The lower end of the movable frame 62 abuts against the piston rod of the cylinder 60, and a hot-sealing plate 63 is mounted on the upper end. The hot-sealing plate 63 is located inside the mounting cavity formed by the folding plate B512 and the lifting frame B511. Figure 9 As shown, when the piston rod of cylinder 60 extends, the pusher 62 overcomes the force of the compression spring 64 and rotates counterclockwise around the pivot 61 by a certain angle. The compression spring 64 is compressed, causing the hot-sealing plate 63 to hot-seal the upper and lower long edges of the overlapping transparent paper 7. When the piston rod of cylinder 60 retracts, the compression spring 64 recovers its deformation and elongates, and the pusher 62 rotates clockwise around the pivot 61 by a certain angle, causing the hot-sealing plate 63 to retract into the mounting cavity and separate from the transparent paper 7. Similarly, when the piston rod of cylinder 60 repeatedly extends and retracts, the hot-sealing plate 63 repeatedly hot-seals and beautifies the overlapping area of ​​the upper and lower long edges of the transparent paper 7, effectively ensuring the appearance quality of the carton.

[0057] A folding device and method for folding transparent paper for a carton includes the following steps:

[0058] A. Negative pressure is applied to the suction tubes 23 on both sides of a certain receiving cavity 22 on the forming wheel 20 to attract a section of transparent paper 7 conveyed by the host computer. Then, the forming wheel 20 rotates counterclockwise. When the receiving cavity 22 covered by the transparent paper 7 rotates to a horizontal position and the opening faces to the right, the forming wheel 20 stops rotating. The transparent paper 7 is then cut to the required length by the host computer. The host computer can be the device provided by the applicant's patent application filed on August 29, 2023, application number CN202322332870.6, entitled "A Transparent Paper Conveying and Cutting Device".

[0059] B. The pushing mechanism 3 operates, simultaneously contacting the transparent paper 7 and pushing the strip box out of the forming wheel 20 from the horizontally positioned, left-facing receiving cavity 22. When the external force pushes the strip box to be processed into contact with the transparent paper 7 and, in conjunction with the pushing mechanism 3 clamping the strip box, positive pressure is applied to the suction tube 23 holding the transparent paper 7, causing the transparent paper 7 to separate from the suction tube 23. Then, with the assistance of the external force, the pushing mechanism 3 introduces the strip box to be processed into the receiving cavity 22 covered by the transparent paper 7. During this process, the transparent paper 7 smoothly wraps the strip box to be processed. In use, the external force pushing the strip box to be processed into the receiving cavity 22 is provided by a linear module A, an electric cylinder, or a linear motor, etc.

[0060] C. Folding plate A42 moves downward, folding the upper long side of transparent paper 7 onto the right side of the strip box to be processed. Then, folding plate B512 moves upward and contacts folding plate A42, folding the lower long side of transparent paper 7 onto the upper long side. Next, folding plate A42 moves upward and resets. Folding plate B512 moves upward synchronously at the same speed as folding plate A42 until hot-sealing plate 63 moves to the middle position of the strip box to be processed and then stops moving upward.

[0061] D. The cylinder 60 repeatedly pushes the piston rod out and retracts, driving the hot-sealing plate 63 to repeatedly pat the right side of the strip box to be processed, completing the hot-sealing work on the upper and lower long sides of the strip box.

[0062] E. The forming wheel 20 rotates counterclockwise by one station and repeats steps A to D to complete the hot sealing work of the remaining strip boxes to be processed one by one.

Claims

1. A folding method for a transparent paper folding device for a carton, characterized in that: The transparent paper folding device for the strip box includes a machine box (1) and a rotating mechanism (2), an upper folding mechanism (4) and a lower folding mechanism (5) provided on the machine box (1). The upper folding mechanism (4) and the lower folding mechanism (5) are located on the same side of the rotating mechanism (2), and the upper folding mechanism (4) is located above the lower folding mechanism (5). The rotary mechanism (2) includes a support sleeve (21), a rotating sleeve (24) and a forming wheel (20). The support sleeve (21) is fixedly mounted on the housing (1). The rotating sleeve (24) is coaxially mounted inside the support sleeve (21) and rotatably connected to the support sleeve (21). One end of the rotating sleeve (24) is provided with a gear A (25). One end of the forming wheel (20) is fixedly connected to the end of the rotating sleeve (24) away from the gear A (25). An even number of receiving cavities (22) are evenly distributed on the circumferential surface of the forming wheel (20). On each side of the circumference of each receiving cavity (22) on the forming wheel (20), there is an adsorption tube (23) and multiple ventilation holes are provided on the adsorption tube (23); The device also includes a feeding mechanism (3), part of which is located inside the forming wheel (20) and the other part extends into the housing (1); The upper folding mechanism (4) includes a rectangular frame A (40), a lifting frame A (41) and a drive assembly. The rectangular frame A (40) is mounted on the chassis (1). The lifting frame A (41) is slidably connected to the rectangular frame A (40). The bottom of the lifting frame A (41) is provided with a folding plate A (42). The drive assembly is mounted on the chassis (1) or the rectangular frame A (40) and is connected to the lifting frame A (41). The lower folding mechanism (5) includes a transmission assembly (50) and a lower folding assembly (51). The transmission assembly (50) includes a torque input shaft (501) and a crank arm (504). The torque input shaft (501) is connected to the housing (1) through a bushing B. One end of the torque input shaft (501) is fixedly provided with a swing arm (502). The middle part of the crank arm (504) is rotatably connected to the housing (1). One end is rotatably connected to the end of the swing arm (502) away from the torque input shaft (501) through a connecting rod (503). The other end is rotatably connected with a rocker arm (505). The lower folding assembly (51) includes a rectangular frame B (510), a lifting frame B (511) and a folding plate B (512). The rectangular frame B (510) is mounted on the chassis (1). The lifting frame B (511) is slidably connected to the rectangular frame B (510), and the lifting frame B (511) is rotatably connected to one end of the rocker arm (505) away from the crank arm (504). The folding plate B (512) is located on the top of the lifting frame B (511). The lower folding mechanism (5) is provided with a heat sealing component (6); The hot-sealing assembly (6) includes a cylinder (60) and a movable frame (62). The cylinder (60) is mounted on the lifting frame B (511). The middle part of the movable frame (62) is rotatably connected to the lifting frame B (511) via a rotating shaft (61). The upper part of the movable frame (62) is connected to the lifting frame B (511) via a compression spring (64). The lower end of the movable frame (62) abuts against the piston rod of the cylinder (60). The upper end is provided with a hot-sealing plate (63). The hot-sealing plate (63) is located inside the mounting cavity formed by the folding plate B (512) and the lifting frame B (511). The folding method of the transparent paper folding device for the carton includes the following steps: A. Apply negative pressure to the suction tubes (23) on both sides of a certain cavity (22) on the forming wheel (20) to attract a piece of transparent paper (7) sent by the host computer. Then the forming wheel (20) rotates counterclockwise. When the cavity (22) covered by the transparent paper (7) rotates to a horizontal position and the opening faces to the right, the forming wheel (20) stops rotating. B. The pushing mechanism (3) operates, and while in contact with the transparent paper (7), it pushes the strip box in the receiving cavity (22) which is located in a horizontal position and has an opening facing left out of the forming wheel (20). When the external force pushes the strip box to be processed into contact with the transparent paper (7) and cooperates with the pushing mechanism (3) to clamp the strip box to be processed, positive pressure is applied to the suction tube (23) that holds the transparent paper (7) so that the transparent paper (7) separates from the suction tube (23). Then, the pushing mechanism (3) introduces the strip box to be processed into the receiving cavity (22) covered by the transparent paper (7) under the cooperation of the external force. During this process, the transparent paper (7) completes the wrapping of the strip box to be processed. C. Folding plate A (42) moves downward to fold the upper long side of the transparent paper (7) onto the right side of the strip box to be processed. Then, folding plate B (512) moves upward to contact folding plate A (42), so that the lower long side of the transparent paper (7) is folded onto the upper long side. Next, folding plate A (42) moves upward to reset. Folding plate B (512) moves upward synchronously at the same speed as folding plate A (42) until the hot-sealing plate (63) moves to the middle position of the strip box to be processed and then stops moving upward. D. The cylinder (60) repeatedly pushes the piston rod out and retracts, driving the hot-sealing plate (63) to repeatedly pat the right side of the strip box to be processed, completing the hot-sealing work on the upper and lower long sides of the strip box to be processed. E. The forming wheel (20) rotates counterclockwise by one station and repeats steps A to D to complete the hot sealing work of the remaining strip boxes to be processed one by one.

2. The folding method of the carton transparent paper folding device as described in claim 1, characterized in that: The feeding mechanism (3) includes a mounting sleeve (300), a transmission shaft (303) and a support frame (306). The mounting sleeve (300) is located inside the housing (1). A servo motor (301) is provided inside the mounting sleeve (300). The output shaft of the servo motor (301) extends outside the mounting sleeve (300), and a gear B (304) is provided on the output shaft of the servo motor (301). The middle part of the drive shaft (303) is connected to the housing (1) through the bushing A (302), and one end of the drive shaft (303) is provided with a gear C (305) that meshes with the gear B (304), and the other end is provided with a gear D (307). The support frame (306) is fixedly connected to the support sleeve (21) at one end away from the chassis (1). A gear shaft is rotatably provided inside the support frame (306). One end of the gear shaft is provided with a gear E, which meshes with a gear D (307). The other end of the gear shaft is provided with a gear F (308). A bar box inlet rack (309) and a bar box outlet rack (311) are slidably provided inside the support frame (306). The bar box inlet rack (309) meshes with a gear F (308), and the bar box outlet rack (311) meshes with a gear D (307). A positioning block (310) is provided at one end of the carton introduction rack (309), and a push plate (312) is provided at the end of the carton ejection rack (311) away from the positioning block (310).

3. The folding method of the carton transparent paper folding device as described in claim 1, characterized in that: The driving component is a linear module.

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