Corrugated carton automatic sealing device and method

Abstract

The invention relates to the technical field of carton sealing, in particular to an automatic corrugated carton sealing device which comprises a rack, a conveying assembly is arranged on the rack, a guide assembly is mounted on the conveying assembly, a first mounting frame and a second mounting frame are arranged on the rack, two sets of pre-folding assemblies which are oppositely arranged are arranged on the first mounting frame, and two sets of pre-folding assemblies are arranged on the second mounting frame. A box sealing assembly is mounted on the second mounting frame, a jacking assembly is further arranged on the rack, and the box sealing assembly and the jacking assembly are both electrically connected with the control unit. Through the arrangement of the pre-folding assembly, the front and rear rocking covers are pre-folded firstly, then the left and right rocking covers are pre-folded, and the situation that the box sealing quality is unstable due to the fact that the box sealing is not pre-folded during box sealing is avoided; or when the carton is sealed, only the two sides are pre-folded, so that the shaking covers on the left side and the right side and the shaking covers at the front end and the rear end are extruded, and the shaking covers are damaged and torn, and full-automatic packaging of the carton is achieved.

Description

Technical Field

[0001] This invention relates to the field of carton sealing, and more particularly to an automatic sealing device and method for corrugated cartons. Background Technology

[0002] In modern logistics, warehousing, and product packaging, corrugated cardboard boxes have become one of the most widely used packaging containers due to their advantages such as lightweight, high strength, low cost, and recyclability. With the advancement of industrialization and automation, the sealing process for corrugated cardboard boxes has gradually transitioned from traditional manual operation to automated equipment. However, existing sealing technologies and equipment still have many shortcomings, making it difficult to meet the demands of modern production for efficiency, precision, and versatility.

[0003] Currently, common methods for sealing corrugated boxes mainly include manual sealing and semi-automatic sealing machines. Manual sealing relies on operators manually applying tape or fastening buckles, which suffers from low efficiency, high labor intensity, and inconsistent sealing quality, making it difficult to meet the needs of large-scale production. While semi-automatic sealing machines can partially replace manual operation, they still require manual assistance in positioning and pressing. In particular, with automatic folding sealing machines, before the carton is fed into the machine for folding, the folding plates of the carton need to be slightly tilted inward to avoid incomplete folding and incomplete sealing. This is generally assisted by manual operation.

[0004] While existing fully automatic carton sealing machines can achieve continuous operation, they still have technical defects in practical applications. Chinese patent CN119975985B achieves fully automatic carton sealing, ensuring tight tape adhesion and inward tilting of the left and right flaps. However, it uses a blower for blowing, making it difficult for dust adhering to the flaps to fall off. Furthermore, it only pre-folds the left and right flaps to tilt inward. During the subsequent sealing process of the carton sealing components, the flaps at the front and rear ends will squeeze the inwardly tilted left and right flaps, causing damage or tearing of the left and right sides or the front and rear flaps. This further leads to frequent machine shutdowns and low carton sealing efficiency. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide an automatic sealing device and method for corrugated cartons. By setting a pre-folding component, the front and rear flaps are pre-folded first, and then the left and right flaps are pre-folded. This avoids the instability of sealing quality caused by failure to pre-fold during sealing, or the situation where only the two sides are pre-folded during sealing, resulting in compression between the left and right flaps and the front and rear flaps, leading to damage or tearing of the flaps. This invention achieves fully automatic sealing of cartons.

[0006] To achieve the above objectives, the present invention provides the following technical solution: An automatic sealing device for corrugated cardboard boxes includes a frame, a transport component on the frame, a guide component mounted on the transport component, a first mounting frame and a second mounting frame on the frame, two sets of pre-folding components arranged opposite each other on the first mounting frame, a sealing component mounted on the second mounting frame, and a lifting component on the frame. Both the sealing component and the lifting component are electrically connected to a control unit. The pre-folding assembly includes a first pre-folding component and a first multi-link hinged to the first pre-folding component. The first pre-folding component is rotatably connected to one end of the bottom of the top plate of the first mounting frame along the transport direction of the transport assembly. One end of the first multi-link is rotatably connected to the side of the first pre-folding component away from the first mounting frame, and the other end of the first multi-link is rotatably connected to a second multi-link. The end of the second multi-link away from the first multi-link is rotatably connected to the bottom of the top plate of the first mounting frame. The second multi-link is rotated by a driving component mounted on the top plate of the first mounting frame. Preferably, the pre-folding assembly further includes an angle connector that is laterally rotatably connected to the support rod of the first mounting frame. The right end of the angle connector is intermittently connected to the second multi-link via a ratchet assembly. The left end of the angle connector is movably connected to a second pre-folding component. The second pre-folding component is rotatably connected to one side of the bottom of the top plate of the first mounting frame. The second pre-folding component moves radially along the transport assembly. A tension spring is also connected between the angle connector and the support rod.

[0007] Preferably, the first pre-folding component includes a first rotating rod, one end of which is hinged to one end of the bottom of the first mounting bracket, and the other end of which is fixedly connected to a first pre-folding rod, which is arranged perpendicular to the guide assembly; the second pre-folding component includes a second rotating rod, one end of which is hinged to one side of the bottom of the first mounting bracket, and the other end of which is fixedly connected to a second pre-folding rod, which has a wiping layer fixed on it, and is arranged parallel to the guide assembly.

[0008] Preferably, the ratchet assembly includes a ratchet fixedly mounted on the second multi-link and a paddle laterally rotatably connected to the angle connector. The paddle is located on the movement trajectory of the ratchet and is disposed at the right end of the angle connector. A limiting rod is provided at the left end of the paddle near the support rod, and the limiting rod is fixed to the angle connector.

[0009] Preferably, the right end of the angle connector is further provided with a toggle plate, the toggle plate being located outside the second pre-bending rod, and the angle of the angle connector being 90°.

[0010] Preferably, the transport assembly includes multiple drive rollers arranged in a radial array along the frame, all of which are driven by chains. A first motor is mounted on one side of the frame, and the output shaft of the first motor is fixedly connected to one of the drive rollers.

[0011] Preferably, the lifting assembly is located below the transport assembly. The lifting assembly includes a telescopic cylinder fixed to the frame, a lifting frame fixed to the top of the telescopic cylinder, and lifting plates fixed to both ends of the lifting frame. The lifting plates are arranged parallel to the drive rollers, and the top of the lifting plates can extend above the drive rollers through the telescopic cylinder. The lifting assembly also includes a sensor installed at the bottom of the top plate of the first mounting frame. Both the sensor and the telescopic cylinder are electrically connected to the control unit.

[0012] Preferably, the driving component includes a driven gear, a driving gear, and a second motor. The driven gear is fixed on the rotating shaft of the second multi-link located at one end of the bottom of the top plate of the first mounting bracket. The second motor is fixed on the top plate of the first mounting bracket. The driving gear is fixed on the output shaft of the second motor. The driving gear meshes with the driven gear for transmission.

[0013] Preferably, the guide assembly includes two mounting shells, which are symmetrically distributed and adjustablely mounted on both sides of the transmission roller. The two ends of the interior of each mounting shell are fitted with a rotating shaft, and a transmission belt is sleeved between the rotating shafts. A third motor is mounted on the frame located below the transmission roller, and the rotating shaft is fixedly connected to the output shaft of the third motor.

[0014] The present invention also claims protection for a method of using an automatic sealing device for corrugated cartons, S1: operating the transport component and the guide component to place the carton on the drive roller and begin conveying the carton below the first mounting frame; S2: After the carton arrives below the first mounting frame, the sensor under the top plate of the first mounting frame detects the arrival of the carton and drives the telescopic cylinder to rise, which in turn lifts the top plate and supports the carton above the drive roller. S3: The second motor drives the two sets of pre-folding components, causing the second multi-link and the first multi-link to rotate inwards towards the first mounting frame. At this time, the first pre-folding rod of the first pre-folding component rotates to fold the flaps at both ends of the carton towards the middle, achieving pre-folding of the flaps at both ends. When rotating inwards, the ratchet on the second multi-link passes the lever, and the angle connector does not rotate. After the flaps on both ends are pre-folded, the second motor is driven to reverse, causing the second multi-link and the first multi-link to rotate outwards towards the first mounting frame. During the rotation, the ratchet drives the lever, causing the angle connector to rotate to the right. At this time, the actuating plate moves the second pre-folding rod, pre-folding the flaps on both sides of the carton towards the middle. During the pre-folding process, the wiping layer wipes the surface of the flaps on both sides to remove dust. When the ratchet resets, it passes the lever, and the tension spring on one side of the angle connector pulls it to reset the angle connector. After the second pre-folding component is no longer moved by the actuating plate, it automatically returns to its original position by gravity. This completes the pre-folding of the flaps at both ends and on both sides. S4: After pre-folding is completed, the second motor stops rotating and drives the telescopic cylinder to descend, which in turn lowers the lifting plate and places the carton on the transmission roller. The carton is then conveyed to the sealing assembly for sealing. The next carton is placed on the transmission roller and begins to be conveyed below the first mounting frame. S5: Repeat S2-S4.

[0015] Compared with the prior art, the present invention has the following beneficial effects: This invention utilizes a pre-folding component to pre-fold the front and rear flaps. Simultaneously, the left and right flaps are pre-folded and wiped clean, achieving pre-folding of all four flaps. This avoids issues like inconsistencies in sealing quality due to lack of pre-folding, or only pre-folding the left and right flaps, which can lead to compression between the flaps and the front and rear flaps during sealing, causing damage or tearing. Furthermore, wiping the left and right flaps ensures a tight seal during subsequent tape application, preventing tape detachment and achieving fully automated carton sealing. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of an automatic sealing device for corrugated cardboard boxes according to the present invention; Figure 2 This is a schematic diagram of the overall structure of an automatic sealing device for corrugated cardboard boxes according to the present invention; Figure 3 This is a partially enlarged structural diagram of the pre-folding component of an automatic corrugated carton sealing device according to the present invention; Figure 4 Figure 3 A partially enlarged structural diagram; Figure 5 This is a schematic diagram of the angle connector of an automatic corrugated carton sealing device according to the present invention; Figure 6 This is an exploded structural diagram of the lifting component of an automatic corrugated cardboard box sealing device according to the present invention.

[0017] In the diagram: 100, frame; 200, transport assembly; 300, guide assembly; 400, pre-folding assembly; 500, sealing assembly; 600, lifting assembly; 110, first mounting bracket; 120, second mounting bracket; 111, support rod; 210, drive roller; 310, mounting housing; 320, rotating shaft; 330, drive belt; 410, first pre-folding component; 420, first multi-link; 430, second multi-link; 440, drive component; 450, angle. Connector; 460, ratchet assembly; 470, second pre-folding component; 480, tension spring; 411, first rotating rod; 412, first pre-folding rod; 441, driven gear; 442, driving gear; 443, second motor; 451, actuating plate; 461, ratchet; 462, paddle; 463, limit rod; 471, second rotating rod; 472, second pre-folding rod; 473, wiping layer; 610, telescopic cylinder; 620, lifting frame; 630, lifting plate. Detailed Implementation

[0018] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention. Furthermore, the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0019] Example 1

[0020] An automatic sealing device for corrugated cartons includes a frame 100, a transport component 200 mounted on the frame 100, a guide component 300 mounted on the transport component 200, a first mounting frame 110 and a second mounting frame 120 mounted on the frame 100, two sets of pre-folding components 400 arranged opposite each other on the first mounting frame 110, a sealing component 500 mounted on the second mounting frame 120, and a lifting component 600 mounted on the frame 100. Both the sealing component 500 and the lifting component 600 are electrically connected to a control unit. The transport component 200 is used to transport the carton; the guide component 300 is used to limit the width of the carton and guide its transport, ensuring the carton is centered during transport and preventing it from shifting; the pre-folding component 400 pre-folds the carton to prevent uneven folding during the subsequent sealing component 500 sealing process, which could result in the flaps on both sides or ends not being folded according to the sealing path, making sealing impossible; the sealing component 500 is used to press the flaps of the carton and seal them with tape; the lifting component 600 stops the carton from being transported during pre-folding and resumes transporting it to the next process after pre-folding is complete.

[0021] The pre-folding assembly 400 includes a first pre-folding component 410 and a first multi-link 420 hinged to the first pre-folding component 410. The first pre-folding component 410 is rotatably connected to one end of the bottom of the top plate of the first mounting frame 110 along the transport direction of the transport assembly 200. One end of the first multi-link 420 is rotatably connected to the side of the first pre-folding component 410 away from the first mounting frame 110, and the other end of the first multi-link 420 is rotatably connected to a second multi-link 430. The end of the second multi-link 430 away from the first multi-link 420 is rotatably connected to the bottom of the top plate of the first mounting frame 110. The second multi-link 430 is rotated by a driving component 440 mounted on the top plate of the first mounting frame 110. In this embodiment, the pre-folding assembly 400 further includes an angle connector 450 that is laterally rotatably connected to the support rod 111 of the first mounting bracket 110. The right end of the angle connector 450 is intermittently connected to the second multi-link 430 via a ratchet assembly 460. The left end of the angle connector 450 is movably connected to a second pre-folding component 470. The second pre-folding component 470 is rotatably connected to one side of the bottom of the top plate of the first mounting bracket 110. The second pre-folding component 470 moves radially along the transport assembly 200. A tension spring 480 is also connected between the angle connector 450 and the support rod 111.

[0022] The first pre-folding component 410 is used to pre-fold the flaps at both ends of the carton. The first multi-link 420 is driven by the driving component of the second multi-link 430, so that the first pre-folding component 410 swings along the axial direction of the transport assembly 200. The second pre-folding component 470 is used to pre-fold the flaps on the left and right sides of the carton. The second pre-folding component 470 swings along the radial direction of the transport assembly 200 by the actuation of the angle connector 450.

[0023] The first pre-folding component 410 first pre-folds the flaps at both ends. After that, the second pre-folding component 470, driven by the angle connector 450, pre-folds the flaps on the left and right sides of the carton. Specifically, the drive component 440 of the second multi-link 430 drives the first multi-link 420 to rotate inward toward the first mounting bracket 110, causing the first pre-folding component 410 to swing inward toward the first mounting bracket 110 to achieve pre-folding. During the swing, the ratchet 461 on the second multi-link 430 passes the paddle 462 of the angle connector 450, completing the pre-folding of the flaps at both ends by the first pre-folding component 410. When the flap is pre-folded, the second multi-link 430 is reversed. Under the action of the limit rod 463, the paddle 462 engages the ratchet 461, which drives the angle connector 450 to rotate. At this time, the actuating plate 451 actuates the second pre-folding component 470, which rotates towards the top plate of the first mounting bracket 110 to achieve pre-folding of the flaps on both sides. When the second multi-link 430 continues to rotate, the ratchet 461 passes the paddle 462, the angle connector 450 returns to its original position under the action of the tension spring 480, and the second pre-folding component 470 also returns to its original position under the action of gravity, completing the pre-folding of the carton flap.

[0024] In this embodiment, the first pre-folding component 410 includes a first rotating rod 411, one end of which is hinged to one end of the bottom of the first mounting bracket 110, and the other end of which is fixedly connected to a first pre-folding rod 412. The first pre-folding rod 412 is arranged perpendicular to the guide assembly 300. The second pre-folding component 470 includes a second rotating rod 471, one end of which is hinged to one side of the bottom of the first mounting bracket 110, and the other end of which is fixedly connected to a second pre-folding rod 472. A wiping layer 473 is fixed on the second pre-folding rod 472, and the second pre-folding rod 472 is arranged parallel to the guide assembly 300.

[0025] The first pre-folding rod 412 and the second pre-folding rod 472 pre-fold the flaps, and the wiping layer 473 is used to wipe the flap surfaces on the left and right sides of the carton.

[0026] In this embodiment, the ratchet assembly 460 includes a ratchet 461 fixedly mounted on the second multi-link 430, and a paddle 462 laterally rotatably connected to the angle connector 450. The paddle 462 is located on the movement trajectory of the ratchet 461. The paddle 462 is disposed at the right end of the angle connector 450. A limiting rod 463 is provided at the left end of the paddle 462 near the support rod 111. The limiting rod 463 is fixed to the angle connector 450.

[0027] The ratchet assembly 460 and the angle connector 450 are designed so that when the front and rear flaps are pre-folded, the second pre-folding components 470 on both sides remain stationary. When the first pre-folding component 410 completes the pre-folding of the front and rear flaps, it drives the second pre-folding components 470 on both sides to pre-fold, thus avoiding synchronous interference.

[0028] It should be noted that a spring is provided between the lever 462 and the hinge post on the angle connector 450 for the automatic return of the lever 462; the spring is sleeved on the hinge post, one end of the spring is fixed on the lever 462, and the other end is fixed on the hinge post of the angle connector 450.

[0029] In this embodiment, the right end of the angle connector 450 is further provided with a toggle plate 451, which is located outside the second pre-bending rod 472. The angle of the angle connector 450 is 90°. When the angle connector 450 returns to its original position, the directions of the two rods are parallel to the two sides of the mounting bracket.

[0030] In this embodiment, the transport assembly 200 includes multiple drive rollers 210 arranged radially along the frame 100. The multiple drive rollers 210 are all driven by chains. A first motor is installed on one side of the frame 100, and the output shaft of the first motor is fixedly connected to one of the drive rollers 210.

[0031] In this embodiment, the lifting assembly 600 is located below the transport assembly 200. The lifting assembly 600 includes a telescopic cylinder 610 fixed on the frame 100. A lifting frame 620 is fixed to the top of the telescopic cylinder 610. Lifting plates 630 are fixed to both ends of the lifting frame 620. The lifting plates 630 are arranged parallel to the transmission roller 210. The top of the lifting plates 630 can extend above the transmission roller 210 through the telescopic cylinder 610. The lifting assembly 600 also includes a sensor installed at the bottom of the top plate of the first mounting frame 110. Both the sensor and the telescopic cylinder 610 are electrically connected to the control unit.

[0032] When the carton reaches below the first mounting frame, the sensor detects the carton and immediately drives the telescopic cylinder 610 to extend, causing the lifting plate 630 to extend above the transmission roller 210, thereby supporting the carton; after pre-folding, the telescopic cylinder 610 is driven to retract, causing the lifting plate 630 to descend below the transmission roller 210, and the carton continues to be conveyed.

[0033] It should be noted that there is a gap between the drive rollers 210, and the lifting plate 630 extends and retracts through the gap between the drive rollers 210 without affecting the operation of the drive rollers 210; the installation position of the sensor is set according to the size of the carton, so that when the carton is detected, the carton can fall exactly on the lifting plates 630 at both ends. Specifically, it can be set according to actual needs; the sensor can be a photoelectric sensor, and the control unit can be a PLC controller, both of which are existing technologies and are not limited here.

[0034] In this embodiment, the drive component 440 includes a driven gear 441, a driving gear 442, and a second motor 443. The driven gear 441 is fixed on the rotating shaft of the second multi-link 430 located at one end of the bottom of the top plate of the first mounting bracket 110. The second motor 443 is fixed on the top plate of the first mounting bracket 110. The driving gear 442 is fixed on the output shaft of the second motor 443. The driving gear 442 meshes with the driven gear 441 for transmission.

[0035] When pre-folding is required, the second motor 443 at both ends is driven to rotate simultaneously to ensure synchronous transmission and complete the pre-folding. Furthermore, the driving component 440 in this embodiment can also be driven by bevel gears, bidirectional screws and motors in the prior art. The specific selection is based on actual conditions and is not limited here.

[0036] In this embodiment, the guide assembly 300 includes two mounting shells 310, which are symmetrically distributed and adjustablely mounted on both sides of the transmission roller 210. The two ends of the mounting shell 310 are mounted with rotating shafts 320, and a transmission belt 330 is sleeved between the rotating shafts 320. A third motor is mounted on the frame 100 located below the transmission roller 210, and the rotating shafts 320 are fixedly connected to the output shaft of the third motor.

[0037] In this embodiment, the wiping layer 473 is a brush layer or a cleaning sponge layer.

[0038] The wiping layer 473 is used to wipe the surfaces of the left and right flaps. The wiping layer 473 can be embedded and fixed on the surface of the second pre-folding rod 472 for easy replacement and cleaning.

[0039] It should be noted that the sealing assembly 500 is used to tape the top of the pre-folded carton, and can employ a known automatic sealing mechanism, such as the sealing assembly 3 specifically disclosed in patent document CN119975985B. This sealing assembly 3 uses a folding tongue plate 332 and a drive cylinder 318 to drive the flap connecting rod 321, flattening the flaps at both ends of the carton. Then, the flaps on the left and right sides of the carton are gradually folded inward by the folding tongue rods 316 on both sides during movement. Finally, during the movement of the carton, the tape is pulled out and, with the rolling effect of the pressure roller 305, adheres the tape to the folded area of ​​the left and right flaps. The pressure roller 305 presses the flaps firmly, and finally, the cutter 312 cuts the tape. These specific processes have been fully explained in the aforementioned references and will not be repeated here for simplicity.

[0040] The pre-folding component 400 ensures that during the sealing process, when the folding tongue plate 332 and the folding cover connecting rod 321 are flattened, the front and rear flaps are not interfered with by the inward tilting left and right flaps, which would cause them to squeeze and tear each other. At the same time, it enables the left and right flaps to gradually fold inward when pressed against the folding tongue rod 316. Furthermore, it wipes away the dust on the surface of the left and right flaps, improves the adhesion, and achieves the function of preventing them from falling off.

[0041] Example 2

[0042] A method for using an automatic sealing device for corrugated cardboard boxes. S1: The transport assembly 200 and the guide assembly 300 are operated to place the carton on the drive roller 210 and the carton begins to be conveyed below the first mounting frame 110; S2: After the carton arrives below the first mounting frame 110, the sensor under the top plate of the first mounting frame 110 detects the arrival of the carton and drives the telescopic cylinder 610 to rise, which in turn drives the lifting plate 630 to rise and supports the carton above the transmission roller 210. S3: The second motor 443 drives the two sets of pre-folding components 400, causing the second multi-link 430 and the first multi-link 420 to rotate inward toward the first mounting frame 110. At this time, the first pre-folding rod 412 of the first pre-folding component 410 rotates to fold the flaps at both ends of the carton toward the middle, realizing the pre-folding of the flaps at both ends. When rotating inward, the ratchet 461 on the second multi-link 430 passes the paddle 462, and the angle connector 450 does not rotate. After the flaps at both ends are pre-folded, the second motor 443 is driven to reverse, causing the second multi-link 430 and the first multi-link 420 to rotate outward toward the first mounting frame 110. During rotation, ratchet 461 drives lever 462, causing angle connector 450 to rotate to the right. At this time, lever 451 moves second pre-folding lever 472, pre-folding the flaps on both sides of the carton towards the center. During the pre-folding process, wiping layer 473 wipes the surface of the flaps on both sides to remove dust. After ratchet 461 returns to its original position, it passes lever 462, and tension spring 480 on one side of angle connector 450 is pulled to return angle connector 450 to its original position. After the second pre-folding component 470 is no longer moved by lever 451, it automatically returns to its original position by gravity. This completes the pre-folding of the front and rear ends and the left and right flaps. S4: After pre-folding is completed, the second motor 443 stops rotating and drives the telescopic cylinder 610 to descend, which in turn drives the lifting plate 630 to descend, placing the carton on the transmission roller 210 and continuing to convey it to the sealing assembly 500 for sealing; the next carton is placed on the transmission roller 210, and the carton begins to be conveyed below the first mounting frame 110; S5: Repeat S2-S4.

[0043] Although the present invention has been disclosed above with reference to embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. An automatic sealing device for corrugated cardboard boxes, comprising a frame (100), characterized in that: The frame (100) is provided with a transport assembly (200), and a guide assembly (300) is installed on the transport assembly (200). The frame (100) is provided with a first mounting frame (110) and a second mounting frame (120). The first mounting frame (110) is provided with two sets of pre-folding assemblies (400) arranged opposite to each other. The second mounting frame (120) is provided with a sealing assembly (500). The frame (100) is also provided with a lifting assembly (600). The sealing assembly (500) and the lifting assembly (600) are both electrically connected to the control unit. The pre-folding assembly (400) includes a first pre-folding component (410) and a first multi-link (420) hinged to the first pre-folding component (410). The first pre-folding component (410) is rotatably connected to one end of the bottom of the top plate of the first mounting frame (110) along the transport direction of the transport assembly (200). One end of the first multi-link (420) is rotatably connected to the side of the first pre-folding component (410) away from the first mounting frame (110), and the other end of the first multi-link (420) is rotatably connected to a second multi-link (430). The end of the second multi-link (430) away from the first multi-link (420) is rotatably connected to the bottom of the top plate of the first mounting frame (110). The second multi-link (430) is rotated by a drive component (440) mounted on the top plate of the first mounting frame (110).

2. The automatic sealing device for corrugated cardboard boxes according to claim 1, characterized in that: The pre-folding assembly (400) further includes an angle connector (450) laterally rotatably connected to the support rod (111) of the first mounting bracket (110). The right end of the angle connector (450) is intermittently connected to the second multi-link (430) via a ratchet assembly (460). The left end of the angle connector (450) is movably connected to a second pre-folding component (470). The second pre-folding component (470) is rotatably connected to the bottom side of the top plate of the first mounting bracket (110). The second pre-folding component (470) moves radially along the transport assembly (200). A tension spring (480) is also connected between the angle connector (450) and the support rod (111).

3. The automatic sealing device for corrugated cardboard boxes according to claim 2, characterized in that: The first pre-folding component (410) includes a first rotating rod (411), one end of which is hinged to the bottom end of the first mounting bracket (110), and the other end of which is fixedly connected to a first pre-folding rod (412). The first pre-folding rod (412) is arranged perpendicular to the guide assembly (300). The second pre-folding component (470) includes a second rotating rod (471), one end of which is hinged to the bottom side of the first mounting bracket (110), and the other end of which is fixedly connected to a second pre-folding rod (472). A wiping layer (473) is fixed on the second pre-folding rod (472), and the second pre-folding rod (472) is arranged parallel to the guide assembly (300).

4. The automatic sealing device for corrugated cardboard boxes according to claim 2, characterized in that: The ratchet assembly (460) includes a ratchet (461) fixedly mounted on the second multi-link (430) and a paddle (462) laterally rotatably connected to the angle connector (450). The paddle (462) is located on the movement trajectory of the ratchet (461). The paddle (462) is located at the right end of the angle connector (450). A limiting rod (463) is provided at the left end of the paddle (462) near the support rod (111). The limiting rod (463) is fixed on the angle connector (450).

5. An automatic sealing device for corrugated cardboard boxes according to claim 2, characterized in that: The right end of the angle connector (450) is also provided with a toggle plate (451), which is located outside the second pre-bending rod (472), and the angle of the angle connector (450) is 90°.

6. The automatic sealing device for corrugated cardboard boxes according to claim 1, characterized in that: The transport assembly (200) includes multiple drive rollers (210) arranged radially along the frame (100), which are driven by chains. A first motor is mounted on one side of the frame (100), and the output shaft of the first motor is fixedly connected to one of the drive rollers (210).

7. An automatic sealing device for corrugated cardboard boxes according to claim 6, characterized in that: The lifting assembly (600) is located below the transport assembly (200). The lifting assembly (600) includes a telescopic cylinder (610) fixed on the frame (100). A lifting frame (620) is fixed to the top of the telescopic cylinder (610). Lifting plates (630) are fixed to both ends of the lifting frame (620). The lifting plates (630) are arranged parallel to the drive roller (210). The top of the lifting plates (630) can extend above the drive roller (210) through the telescopic cylinder (610). The lifting assembly (600) also includes a sensor installed at the bottom of the top plate of the first mounting frame (110). Both the sensor and the telescopic cylinder (610) are electrically connected to the control unit.

8. An automatic sealing device for corrugated cardboard boxes according to claim 1, characterized in that: The drive component (440) includes a driven gear (441), a driving gear (442), and a second motor (443). The driven gear (441) is fixed on the rotating shaft of the second multi-link (430) located at the bottom end of the top plate of the first mounting bracket (110). The second motor (443) is fixed on the top plate of the first mounting bracket (110). The driving gear (442) is fixed on the output shaft of the second motor (443). The driving gear (442) meshes with the driven gear (441) for transmission.

9. An automatic sealing device for corrugated cardboard boxes according to claim 6, characterized in that: The guide assembly (300) includes two mounting shells (310), which are symmetrically distributed and adjustablely mounted on both sides of the transmission roller (210). The two ends of the interior of the mounting shell (310) are equipped with rotating shafts (320), and a transmission belt (330) is sleeved between the rotating shafts (320). A third motor is mounted on the frame (100) located below the transmission roller (210), and the rotating shafts (320) are fixedly connected to the output shaft of the third motor.

10. A method of using an automatic sealing device for corrugated cardboard boxes according to any one of claims 1-9, characterized in that: S1: The transport assembly (200) and guide assembly (300) are operated to place the carton on the drive roller (210) and the carton begins to be conveyed below the first mounting frame (110); S2: After the carton arrives below the first mounting frame (110), the sensor under the top plate of the first mounting frame (110) detects the arrival of the carton and drives the telescopic cylinder (610) to rise, which in turn drives the lifting plate (630) to rise and supports the carton above the transmission roller (210). S3: The second motor (443) drives the two sets of pre-folding components (400), driving the second multi-link (430) and the first multi-link (420) to rotate inward toward the first mounting frame (110). At this time, the first pre-folding rod (412) of the first pre-folding component (410) rotates to fold the flaps at both ends of the carton toward the middle, realizing the pre-folding of the flaps at both ends. When rotating inward, the ratchet (461) on the second multi-link (430) passes the paddle (462), and the angle connector (450) does not rotate. After the flaps at both ends are pre-folded, the second motor (443) is driven to reverse, driving the second multi-link (430) and the first multi-link (420) to rotate outward toward the first mounting frame (110). During the rotation, the ratchet (461) drives the paddle (462) to rotate the angle connector (450) to the right. At this time, the actuating plate (451) actuates the second pre-folding rod (472) to pre-fold the flaps on both sides of the carton towards the middle. During the pre-folding process, the wiping layer (473) wipes the surface of the flaps on both sides to remove dust. After the ratchet (461) is reset, it passes the paddle (462) and the tension spring (480) on one side of the angle connector (450) is pulled to reset the angle connector (450). After the second pre-folding component (470) is not actuated by the actuating plate (451), it automatically returns to its original position by gravity. After the pre-folding of the flaps at both ends and on both sides is completed, the pre-folding of the flaps at both ends and on both sides is completed. S4: After pre-folding, the second motor (443) stops rotating and drives the telescopic cylinder (610) to descend, which in turn drives the lifting plate (630) to descend, placing the carton on the transmission roller (210) and continuing to transport it to the sealing assembly (500) for sealing; the next carton is placed on the transmission roller (210), and the carton begins to be transported below the first mounting frame (110); S5: Repeat S2-S4.

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