CN219770305U - Automatic box sealing device - Google Patents

Abstract

The utility model aims to provide an automatic box sealing device which is reasonable in design, high in automation degree, has a cover folding function and can be adapted to cartons with different heights. The automatic lifting device comprises a lower conveying line, a lifting mechanism, a lifting frame and a glue sealing mechanism, wherein the lifting mechanism is arranged on the lower conveying line, the lifting frame is arranged on the lifting mechanism, the glue sealing mechanism is arranged on the lifting frame, a cover folding mechanism is arranged at the front end of the lifting frame, an upper conveying line is arranged at the rear end of the lifting frame, the cover folding mechanism comprises a front folding piece, a rear folding assembly, a left folding assembly and a right folding assembly which are matched with the lower conveying line and the upper conveying line, the front folding piece and the rear folding assembly are arranged at the front end of the lifting frame in a front-rear mode, and the left folding assembly and the right folding assembly are respectively arranged at the left side and the right side of the lifting frame. The utility model is applied to the technical field of product packaging.

Description

Automatic box sealing device

Technical Field

The utility model is applied to the technical field of product packaging, and particularly relates to an automatic box sealing device.

Background

Tiles, particularly smaller size tiles, are often mass-packed into cartons after production for shipping, storage and sale. Because ceramic tiles belong to mass production products, a large amount of boxing and box sealing work is needed in the packing and packaging link. At present, after ceramic tile products are put into the cartons, workers generally hold transparent adhesive box sealers to seal the cartons.

However, with the development of the times, the automation operation has been deeply developed in various industries, the ceramic tile manufacturing industry is not exceptional, the production line with high automation degree has adopted an automatic boxing device to realize the automatic boxing of ceramic tiles, if the automatic boxing device is adopted to manually seal the boxes, the labor is wasted, the requirement of automatic production is not met, and the automatic box sealing machine is eliminated in the times, so that the automatic box sealing machine also accompanies the requirement of automatic production.

The utility model patent application with the publication number of CN 111232328A discloses an automatic box sealing machine, which comprises a main body frame, a lifting frame, clamping frames and a sealing frame, wherein the lifting frame is arranged on the main body frame, a pressing rod is arranged on the lower end face of the lifting frame, the lifting frame is controlled to move through a lifting motor, the opening of a packing box is flattened through the pressing rod, the sealing frame is arranged on the lifting frame, the clamping frames are arranged on the lifting frame in a sliding manner, the two clamping frames can clamp the packing box in a positioning manner through relative movement, a driving motor on the clamping frames controls a conveying belt to move so as to drive the clamped packing box to move forwards, and when the packing box moves to a sealing part of the sealing frame, an adhesive tape can seal the packing box.

The automatic carton sealing can be realized in the above patent, but the premise that the pressing rod is adopted to flatten the opening of the carton is that the front, back, left and right folding covers of the carton are folded in advance, so that the flattening work can be smoothly realized, and further conveying and carton sealing can be realized. Therefore, the above patent still needs the workman to turn over the book lid of carton and turn over a book and pre-compaction by hand when the during operation, this just leads to the automation of case sealing work to be discounted greatly to in actual operation, four book lids of carton probably can rise again because of self internal stress and the inertia of material, this just makes the stick of pressing can't flatten the book lid, leads to the encapsulation work failure.

In order to solve the above problems, a new automatic case sealer is needed to meet the requirement of automatic case sealing.

Disclosure of Invention

The utility model aims to solve the technical problem of providing an automatic box sealing device which is reasonable in design, high in automation degree, has a cover folding function and can be adapted to cartons with different heights.

The technical scheme adopted by the utility model is as follows: the automatic lifting device comprises a lower conveying line, a lifting mechanism, a lifting frame and a glue sealing mechanism, wherein the lifting mechanism is arranged on the lower conveying line, the lifting frame is arranged on the lifting mechanism, the glue sealing mechanism is arranged on the lifting frame, a cover folding mechanism is arranged at the front end of the lifting frame, an upper conveying line is arranged at the rear end of the lifting frame, the cover folding mechanism comprises a front folding piece, a rear folding assembly, a left folding assembly and a right folding assembly which are matched with the lower conveying line and the upper conveying line, the front folding piece and the rear folding assembly are arranged at the front end of the lifting frame in a front-rear mode, and the left folding assembly and the right folding assembly are respectively arranged at the left side and the right side of the lifting frame.

Further, the front folding member comprises a prepressing long plate and an arc guide plate which are connected, the prepressing long plate is arranged at the lower end of the lifting frame, the arc guide plate is arranged at the front end of the prepressing long plate, the rear folding assembly comprises a first cylinder, a rotating seat and a bending plate, the first cylinder is arranged on the lifting frame, the rotating seat is arranged at the front end of the lifting frame, the middle part of the bending plate is hinged to the rotating seat, and the upper end of the bending plate is hinged to the output end of the first cylinder and the lower end of the bending plate is positioned at the front side of the arc guide plate.

Further, the left folding assembly and the right folding assembly comprise side mounting plates, second air cylinders, side pushing angle plates and a plurality of guide shafts, the side mounting plates are arranged on the side faces of the lifting frames, the second air cylinders are arranged on the side mounting plates, output ends of the second air cylinders penetrate through the side mounting plates to be connected with the side pushing angle plates, one ends of the guide shafts are connected with the side pushing angle plates to be driven, the other ends of the guide shafts are in sliding fit with the side mounting plates, and the driving direction of the second air cylinders is perpendicular to the conveying direction of the lower conveying line.

Further, elevating system includes two stands of symmetry, two the upper end of stand is connected with the crossbeam post, two the cover is equipped with linking frame on the stand, linking frame and two stand sliding fit, be provided with on the crossbeam post elevator motor and with the synchronizing shaft that elevator motor transmission is connected, rotate and set up on the crossbeam post and both ends all are provided with the gear, two the outside of stand all is provided with the chain, the chain with corresponding gear transmission cooperation, linking frame's both ends respectively with two the chain is connected, the crane sets up linking frame's lower extreme.

Further, seal and glue the mechanism and include seal and glue the seat, tape sleeve, preceding gyro wheel, back gyro wheel, cut out cutter and cutter protecting cover, tape sleeve sets up seal the upper end of gluing the seat, preceding gyro wheel with back gyro wheel sets up respectively seal the front and back both ends of gluing the seat and all float the swing through connecting rod and spring, cut out the cutter with cutter protecting cover all sets up seal the middle part of gluing the seat and be located preceding gyro wheel with back gyro wheel between, cut out the cutter with cutter protecting cover all floats the swing through connecting rod and spring.

Further, the upper conveying line and the lower conveying line are both double-belt conveying lines.

Further, the lower conveying line is arranged on a supporting frame, four guide shafts are arranged on the supporting frame, and the four guide shafts are respectively in sliding fit with guide sleeves on four corners of the lifting frame.

Further, the front end of the lower conveying line is provided with a first air nozzle, the first air nozzle is located below the front folding member and the rear folding member, the left end and the right end of the front end of the lower conveying line are respectively provided with a second air nozzle, the two second air nozzles are located below the left folding member and the right folding member respectively, and the first air nozzle and the second air nozzle are externally connected with an air source. .

The beneficial effects of the utility model are as follows: the lower conveying line is adopted to convey the cartons, the lifting frame is driven by the lifting mechanism to move up and down, so that the height adjustment is realized to adapt to cartons with different heights, the folding cover mechanism is arranged to pre-press the folding cover of the cartons, and meanwhile, the upper conveying line and the lower conveying line are matched for conveying, so that the smooth operation of box sealing is ensured; when the carton is sealed, a worker or equipment or a direct external conveying line can input the carton, the lifting mechanism drives the lifting frame to move to a proper height according to the size of the carton, then the carton enters the working range of each folding assembly, the front folding cover, the rear folding cover, the left folding cover and the right folding cover of the carton are respectively pressed by the front folding assembly, the rear folding assembly, the left folding assembly and the right folding assembly in sequence, so that the sealing of the carton opening is realized, the lower end of the upper conveying line is conveyed by the upper conveying line and the lower conveying line after the carton opening is sealed, the upper conveying line ensures that the carton opening is pressed, the carton is moved to the working position of the glue sealing mechanism to be sealed, and the carton is output after the glue sealing is finished, so that the automatic sealing work is completed. Therefore, the carton box folding machine is reasonable in overall design, has a folding cover folding function, does not need manual folding and prepressing, is high in automation degree, can be adapted to cartons with different heights, and can ensure that the carton box sealing work is smoothly carried out.

Drawings

FIG. 1 is a schematic perspective view of the present utility model;

FIG. 2 is an enlarged view of portion A of FIG. 1;

FIG. 3 is a schematic perspective view of the lifting mechanism and the lifting frame according to the present utility model;

FIG. 4 is a schematic perspective view of the lifting frame and the cover folding mechanism according to the present utility model;

FIG. 5 is a schematic perspective view of a folding mechanism according to the present utility model;

FIG. 6 is a schematic perspective view of a front hinge according to the present utility model;

FIG. 7 is a schematic perspective view of the sealing mechanism according to the present utility model;

fig. 8 is an exploded view of the encapsulation mechanism of the present utility model.

Detailed Description

As shown in fig. 1 to 8, the specific embodiments of the present utility model are: the utility model comprises a lower conveying line 1, a lifting mechanism 2, a lifting frame 3 and a sealing mechanism 4; the lower conveying line 1 is used for conveying cartons and can be externally connected with the conveying line to realize direct conveying of the cartons; the lifting mechanism 2 is arranged above the lower conveying line 1 and is used for driving the lifting frame 3 to move up and down so as to realize height adjustment, thereby obtaining better adaptation effect; the glue sealing mechanism 4 is arranged on the lifting frame 3 and moves along with the up-and-down movement of the lifting frame 3, and the glue sealing mechanism 4 is used for performing glue sealing action on the pre-pressed paper box; the front end of the lifting frame 3 is provided with a cover folding mechanism 5, and the cover folding mechanism 5 is used for overturning and pressing four covers of the carton so as to facilitate the sealing action of the sealing mechanism 4; the rear end of the lifting frame 3 is provided with an upper conveying line 6, the cover folding mechanism 5 comprises a front folding member 51, a rear folding member 52, a left folding member 53 and a right folding member 54 which are matched with the lower conveying line 1 and the upper conveying line 6, the front folding member 51 and the rear folding member 52 are arranged at the front end of the lifting frame 3 in a front-back manner, and the left folding member 53 and the right folding member 54 are respectively arranged at the left side and the right side of the lifting frame 3; the front folding member 51 is used for pre-pressing a front folding cover of the carton, the rear folding member 52 is used for pre-pressing a rear folding cover of the carton, the left folding member 53 and the right folding member 54 are used for pre-pressing a left folding cover and a right folding cover of the carton, the four pre-pressed cartons are opened and closed, and then are conveyed by the lower conveying line 1 and the upper conveying line 6 together, and the upper conveying line 6 can press the upper end of the carton, so that the opening of the carton is kept in a press-fit state, and the glue sealing mechanism 4 smoothly completes glue sealing work, thereby completing automatic box sealing; and, when the front folding member 51 is pre-pressed, the rear folding member 52 is pre-pressed, and after the front folding member and the rear folding member are pre-pressed, the left folding member 53 and the right folding member 54 are pre-pressed together to achieve the required closing state of the carton. When the carton is sealed, the lower conveying line 1 is externally connected with the conveying line to input the carton, the lifting mechanism 2 drives the lifting frame 3 to move to a proper height according to the size of the carton, then the carton enters the working range of each folding assembly, the front folding cover, the rear folding cover, the left folding cover and the right folding cover of the carton are respectively pressed by the front folding piece 51, the rear folding assembly 52, the left folding assembly 53 and the right folding assembly 54 in sequence, so that the sealing of the opening of the carton is realized, the carton flows to the lower part of the upper conveying line 6 and is conveyed together by the upper conveying line 6 and the lower conveying line 1 after the opening of the carton is sealed, the upper conveying line 6 ensures that the opening of the carton is pressed, then the carton moves to the working position of the sealing mechanism 4 for sealing, and the carton is output after the sealing is finished, so that the automatic sealing operation is finished. Therefore, the carton box folding machine is reasonable in overall design, has a folding cover folding function, does not need manual folding and prepressing, is high in automation degree, can be adapted to cartons with different heights, and can ensure that the carton box sealing work is smoothly carried out.

In this embodiment, the front folding member 51 includes a pre-pressing long plate 511 and an arc guiding plate 512 that are integrally formed, the pre-pressing long plate 511 is disposed at the lower end of the lifting frame 3, and the arc guiding plate 512 is located at the front end of the pre-pressing long plate 511 and the raising direction of the pre-pressing long plate is towards the direction of carton input, so as to guide the folding cover; the rear folding assembly 52 includes a first cylinder 521, a rotating seat 522, and a bending plate 523, where the first cylinder 521 is horizontally disposed in the middle of the front end of the lifting frame 3, the rotating seat 522 is located on the front side of the first cylinder 521, the middle of the bending plate 523 is hinged to the rotating seat 522, the bending plate 523 is of a bending structure, that is, an obtuse angle is formed from the middle to the upper and lower sections of the demarcation point, and the upper end of the bending plate 523 is hinged to the output end of the first cylinder 521 and the lower end of the bending plate is located on the front side of the circular arc guide plate 512. When the output end of the first cylinder 521 is driven to extend, the lower end of the bending plate 523 performs an arc-shaped return hooking operation, that is, when the carton is in operation, the rear folding cover of the carton can be hooked back, so that the rear folding cover can smoothly enter the lower portion of the arc-shaped guide plate 512 in the conveying process, and thus the carton is smoothly pre-pressed.

In this embodiment, the left folding assembly 53 and the right folding assembly 54 each include a side mounting plate 551, a second cylinder 552, a side pushing angle plate 553, and a plurality of guide shafts 554, where the side mounting plate 551 is disposed on a side surface of the lifting frame 3, the second cylinder 552 is disposed on the side mounting plate 551, an output end of the second cylinder 552 passes through the side mounting plate 551 and is connected with the side pushing angle plate 553, one end of the guide shaft 554 is connected with the side pushing angle plate 553 and the other end of the guide shaft is in sliding fit with the side mounting plate 551, and a driving direction of the second cylinder 552 is perpendicular to a conveying direction of the lower conveying line 1. When the cover folding pre-pressing is performed, the second air cylinder 552 is directly driven, so that the side push angle plate 553 attaches the left cover folding or the right cover folding of the carton to the side edge of the pre-pressing long plate 511, and as the acting surface of the side push angle plate 553 is provided with an inclined surface, the cover folding can be prevented from being directly pressed, so that the cover folding is prevented from being damaged; after the left folding cover and the right folding cover are pre-pressed, the front folding cover and the rear folding cover are pressed on the paper box by the pre-pressing long plate 511, then the paper box flows to the lower side of the upper conveying line 6 under the driving of the lower conveying line 1, and the upper conveying line 6 directly presses the left folding cover and the right folding cover on the paper box due to the fact that the left folding cover and the right folding cover are in an inclined and attached state, so that the paper box sealing state is achieved, and the sealing mechanism 4 is continuously used for sealing glue and conveying out of the conveying stroke of the upper conveying line 6, and sealing work is performed at the moment, namely, the sealing work of the paper box is completed.

In this embodiment, the lifting mechanism 2 includes two symmetrical uprights 21, two the upper end of uprights 21 is connected with crossbeam post 22, two the cover is equipped with connecting frame 23 on the uprights 21, connecting frame 23 and two the upright 21 sliding fit, be provided with elevator motor 24 on the crossbeam post 22 and with elevator motor 24 transmission connection's synchronizing shaft 25, rotate and set up on the crossbeam post 22 and both ends all are provided with the gear, two the outside of uprights 21 all is provided with chain 26, chain 26 and corresponding gear drive cooperation, connecting frame 23's both ends are connected with two chain 26 respectively, crane 3 sets up the lower extreme of connecting frame 23. The lifting motor 24 is used for driving the synchronous shaft 25 to rotate, and the gears at two ends are driven to rotate when the synchronous shaft 25 rotates, so that two chains 26 are driven to synchronously rotate, the connecting frame 23 is respectively connected with the two chains 26, so that vertical displacement can be realized by following the movement of the chains 26, and the lifting frame 3 is arranged at the lower end of the connecting frame 23, so that height adjustment can be realized by following the movement.

In this embodiment, the sealing mechanism 4 includes a sealing seat 41, a tape sleeve 42, a front roller 43, a rear roller 44, a cutting knife 45 and a cutter protecting cover 46, the tape sleeve 42 is disposed at an upper end of the sealing seat 41, the front roller 43 and the rear roller 44 are respectively disposed at front and rear ends of the sealing seat 41 and all perform floating swing through a connecting rod and a spring, the cutting knife 45 and the cutter protecting cover 46 are both disposed in a middle portion of the sealing seat 41 and are located between the front roller 43 and the rear roller 44, and the cutting knife 45 and the cutter protecting cover 46 all perform floating swing through the connecting rod and the spring. The adhesive tape sleeve 42 is used for fixing transparent film, still be provided with a plurality of around the rubber roll in the seal rubber seat 41 and part is equipped with the decorative pattern around the rubber roll surface in order to avoid the sticky tape to glue firmly, preceding gyro wheel 43 has the swing ability that floats for paste the sticky tape on the carton, back gyro wheel 44 also can float the swing, can compress tightly the carton and hug closely the sticky tape simultaneously, the cutting knife 45 is used for cutting off the sticky tape to realize automatic encapsulation, cutter protecting cover 46 with right the cutting knife 45 plays the guard action, utilizes the company of connecting rod to place when not cutting knife 45 keeps the safe distance with the sticky tape. When the paper box is in operation, the paper box moves into the working range of the sealing mechanism 4, the front roller 43 touches the front wall of the paper box, after the adhesive tape is attached, the front roller 43 rolls to the upper wall of the paper box from the front wall of the paper box under the action of the tension force of the spring, meanwhile, the front wall of the paper box pushes away the cutter protecting cover 46, then the paper box continues to advance, the adhesive tape is tightly attached to the paper box under the pressure of the front roller 43, finally, when the front roller 43 leaves the upper wall of the paper box, the cutter protecting cover 46 is not limited any more, and then is reset under the tension force of the spring, the cutter 45 also resets to cut the adhesive tape under the action of the tension force of the spring, meanwhile, the front roller 43 is attached to the rear wall of the paper box under the action of the spring, and the rear roller 44 plays a role of compaction. The links and springs are critical to the sealing operation and determine the action of the front roller 43, the rear roller 44, the cutting blade 45 and the blade cover 46. The sealing mechanism 4 adopts a sealing machine core produced by Wenzhou initiating machinery limited company.

In this embodiment, the upper conveyor line 6 and the lower conveyor line 1 are both double belt conveyor lines. A double belt conveyor line, i.e. a conveyor belt with two synchronous movements (such conveyor lines are known as double track conveyor lines or double rail conveyor lines in the prior art), and a certain distance is provided between the two conveyor belts (not shown in the figures); the sealing mechanism 4 is located between the two conveying belts of the upper conveying line 6, so that motion interference cannot be caused, and the upper conveying line 6 can not only pre-press the folding cover of the carton, but also prevent the sealing mechanism 4 from sealing.

In this embodiment, the lower conveying line 1 is disposed on a supporting frame 7, four guide shafts 8 are disposed on the supporting frame 7, and the four guide shafts 8 are respectively in sliding fit with guide sleeves on four corners of the lifting frame 3. The support frame 7 is used for the installation of lower transfer chain 1, four guiding axle 8 are used for right crane 3 plays the guide effect for crane 3 is in the settlement position all the time when carrying out the reciprocates, guarantees whole cooperation precision.

In this embodiment, a first air nozzle 9 is disposed at the front end of the lower conveying line 1, the first air nozzle 9 is located below the front folding member 51 and the rear folding member 52, second air nozzles 10 are disposed at the left and right ends of the front end of the lower conveying line 1, two second air nozzles 10 are located below the left folding member 53 and the right folding member 54, and the first air nozzle 9 and the second air nozzle 10 are all externally connected with an air source. In view of the fact that the pre-pressing of the cartons is performed on the premise that the angle formed between each folding cover and the cartons is an acute angle, that is, the folding cover cannot be turned out to be lower than the moving parts of the front folding member 51, the rear folding member 52, the left folding member 53 and the right folding member 54, once the angle is lower than a reasonable height, each folding member cannot move the folding cover, and the like, generally occurs in old cartons, and in a few cases, new cartons also occur, therefore, in order to ensure that the folding cover can be pre-pressed smoothly, the folding cover can be blown up by arranging an air nozzle for blowing up; the first air nozzles 9 are used for jetting air to the front folding cover and the rear folding cover of the carton, and the two second air nozzles 10 are used for jetting air to the left folding cover and the right folding cover of the carton; when the front folding cover is sprayed with air, the first air nozzle 9 can blow the paper box smoothly, and when the rear folding cover is sprayed with air, the paper box just passes over the first air nozzle 9. It should be noted that the number of the first air nozzles 9 includes, but is not limited to, one, and the installation positions of the first air nozzles 9 are not limited to the middle part of the front end of the lower conveying line 1, but may be disposed on two sides of the front end of the lower conveying line 1, and only the air outlets of the air nozzles need to be directed to the passing path of the carton, so that there is no concern that the air jets will be blocked by the carton.

While the embodiments of this utility model have been described in terms of practical aspects, they are not to be construed as limiting the meaning of this utility model, and modifications to the embodiments and combinations with other aspects thereof will be apparent to those skilled in the art from this description.

Claims (8)

1. The utility model provides an automatic case sealer device, it includes transfer chain (1), elevating system (2), crane (3) and seals gluey mechanism (4), elevating system (2) set up down on transfer chain (1), crane (3) set up on elevating system (2), seal gluey mechanism (4) set up on crane (3), its characterized in that: the lifting frame is characterized in that a folding mechanism (5) is arranged at the front end of the lifting frame (3), an upper conveying line (6) is arranged at the rear end of the lifting frame (3), the folding mechanism (5) comprises a front folding member (51), a rear folding member (52), a left folding member (53) and a right folding member (54) which are matched with the lower conveying line (1) and the upper conveying line (6), the front folding member (51) and the rear folding member (52) are arranged at the front end of the lifting frame (3) in a front-back mode, and the left folding member (53) and the right folding member (54) are arranged at the left side and the right side of the lifting frame (3) respectively.

2. An automatic box sealing device according to claim 1, wherein: the front folding member (51) comprises a prepressing long plate (511) and an arc guide plate (512) which are connected, the prepressing long plate (511) is arranged at the lower end of the lifting frame (3), the arc guide plate (512) is arranged at the front end of the prepressing long plate (511), the rear folding assembly (52) comprises a first air cylinder (521), a rotating seat (522) and a bending plate (523), the first air cylinder (521) is arranged on the lifting frame (3), the rotating seat (522) is arranged at the front end of the lifting frame (3), the middle part of the bending plate (523) is hinged with the rotating seat (522), and the upper end of the bending plate (523) is hinged with the output end of the first air cylinder (521) and the lower end of the bending plate is positioned at the front side of the arc guide plate (512).

3. An automatic box sealing device according to claim 1, wherein: the left folding assembly (53) and the right folding assembly (54) comprise side mounting plates (551), second air cylinders (552), side pushing angle plates (553) and a plurality of guide shafts (554), the side mounting plates (551) are arranged on the side faces of the lifting frames (3), the second air cylinders (552) are arranged on the side mounting plates (551) and output ends penetrate through the side mounting plates (551) to be connected with the side pushing angle plates (553), one ends of the guide shafts (554) are connected with the side pushing angle plates (553) in a driving mode, the other ends of the guide shafts are in sliding fit with the side mounting plates (551), and the driving direction of the second air cylinders (552) is perpendicular to the conveying direction of the lower conveying line (1).

4. An automatic box sealing device according to claim 1, wherein: elevating system (2) are including two spinal branch posts (21) of symmetry, two the upper end of stand (21) is connected with crossbeam post (22), two the cover is equipped with connecting frame (23) on stand (21), connecting frame (23) and two stand (21) sliding fit, be provided with on crossbeam post (22) elevator motor (24) and with synchronizing shaft (25) that elevator motor (24) transmission is connected, rotate set up on crossbeam post (22) and both ends all are provided with the gear, two the outside of stand (21) all is provided with chain (26), chain (26) and corresponding gear drive cooperation, the both ends of connecting frame (23) are connected with two respectively chain (26), crane (3) set up the lower extreme of connecting frame (23).

5. An automatic box sealing device according to claim 1, wherein: the sealing mechanism (4) comprises a sealing seat (41), an adhesive tape sleeve (42), a front roller (43), a rear roller (44), a cutting knife (45) and a knife protecting cover (46), wherein the adhesive tape sleeve (42) is arranged at the upper end of the sealing seat (41), the front roller (43) and the rear roller (44) are respectively arranged at the front end and the rear end of the sealing seat (41) and float and swing through a connecting rod and a spring, and the cutting knife (45) and the knife protecting cover (46) are respectively arranged at the middle part of the sealing seat (41) and are positioned between the front roller (43) and the rear roller (44), and the cutting knife (45) and the knife protecting cover (46) float and swing through the connecting rod and the spring.

6. An automatic box sealing device according to claim 1, wherein: the upper conveying line (6) and the lower conveying line (1) are both double-belt conveying lines.

7. An automatic box sealing device according to claim 1, wherein: the lower conveying line (1) is arranged on a supporting frame (7), four guide shafts (8) are arranged on the supporting frame (7), and the four guide shafts (8) are respectively in sliding fit with guide sleeves on four corners of the lifting frame (3).

8. An automatic box sealing device according to claim 1, wherein: the front end of lower transfer chain (1) is provided with first air nozzle (9), first air nozzle (9) are located preceding folding member (51) with the below of back folding subassembly (52), the both ends all are provided with second air nozzle (10) about the front end of lower transfer chain (1), two second air nozzle (10) are located respectively left folding subassembly (53) with the below of right folding subassembly (54), first air nozzle (9) with second air nozzle (10) all external air supply.