Bottom sealing mechanism for food packaging carton

Abstract

The utility model discloses a bottom sealing mechanism for a food packaging carton. Comprising a bearing frame; a side conveyor belt; a front pressing roller is rotationally mounted at the top of the front pressing frame, and the front pressing frame has a to-be-pressed state and a glue pressing state; in a to-be-pressed state, the upper end of the front pressing roller is higher than the upper end of the supporting plate; in the adhesive pressing state, the front pressing roller is pressed below by the carton on the supporting plate, and the adhesive tape is pressed and attached to the bottom of the carton; the rear pressing frame is hinged between the two supporting plates and located behind the front pressing frame, a rear pressing roller is rotationally installed on the top of the rear pressing frame, the rear pressing frame and the front pressing frame are in transmission connection through a linkage piece, and when the rear pressing frame is in the upward jacking state, the front pressing frame is in the to-be-pressed state; when the rear pressing frame is in a folded state, the front pressing frame is in a glue pressing state. Through cooperative work of the front pressing frame and the rear pressing frame, the adhesive tape can be accurately pressed and attached to the bottom of a carton, rapid carton sealing is achieved, carton sealing efficiency is remarkably improved, the use number of driving mechanisms is reduced, structural design is simplified, and equipment cost and maintenance difficulty are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to food packaging technical field, in particular, relate to a food packaging carton bottom sealing mechanism. BACKGROUND

[0002] In the field of carton packaging, especially in the food industry, the bottom sealing process of carton is a key link in the packaging process. The traditional carton bottom sealing usually relies on manual operation to paste adhesive tape, which not only is inefficient, but also easily leads to unstable sealing quality, high labor intensity, large equipment floor space and on-site material confusion and other problems. With the development of automation technology, various mechanical sealing devices appear, but these devices mostly use multiple driving mechanisms (such as air cylinders and motors) to realize the bottom sealing operation, which has complex structure and high cost. SUMMARY

[0003] The utility model aims at solving one of the technical problems existing in the prior art. To this end, the utility model provides a food packaging carton bottom sealing mechanism.

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0005] A food packaging carton bottom sealing mechanism comprises: a supporting frame comprising two supporting plates arranged at intervals and used for supporting cartons; two side conveying belts arranged at intervals and located outside the two supporting plates and used for conveying cartons on the supporting plates; a front pressing frame hinged between the two supporting plates, wherein the top of the front pressing frame is rotatably provided with a front pressing roller, and the front pressing frame has a pressing state and a glue pressing state; in the pressing state, the upper end of the front pressing roller is higher than the upper end of the supporting plate; in the glue pressing state, the front pressing roller is pressed below by the carton on the supporting plate and presses the adhesive tape on the bottom of the carton; a rear pressing frame hinged between the two supporting plates and located behind the front pressing frame, wherein the top of the rear pressing frame is rotatably provided with a rear pressing roller, and the rear pressing frame has a top-up state and a folding state; in the top-up state, the upper end of the rear pressing roller is higher than the upper end of the supporting plate; in the folding state, the height of the rear pressing roller is lower than that in the top-up state and can be crossed by the carton; the rear pressing frame is connected to the front pressing frame through a linkage; when the rear pressing frame is in the top-up state, the front pressing frame is in the pressing state; when the rear pressing frame is in the folding state, the front pressing frame is in the glue pressing state; and during the movement from the folding state to the top-up state, the rear pressing frame has at least one tail pressing stroke, and in the tail pressing stroke, the rotation of the rear pressing frame moves the rear pressing roller backward and increases the height of the rear pressing roller; a first reset structure is used to push the front pressing frame in the glue pressing state to return to the pressing state.

[0006] Further, a cutting mechanism is arranged between the front pressing frame and the rear pressing frame and between the two supporting plates, and is used to cut the adhesive tape passing above.

[0007] Further, the cutting mechanism comprises a cutting frame, the cutting frame is provided with a pushing handle, and the cutting frame is provided with a cutting knife; the cutting frame has a depressed state and an initial state, the cutting frame is movably arranged on the supporting plate to realize switching between the depressed state and the initial state; in the initial state, the cutting edge of the cutting knife is higher than the top end of the supporting plate; in the depressed state, the cutting edge of the cutting knife is lower than the top end of the supporting plate; the pushing handle is used for being contacted with the carton moving backward and being driven by the carton to move the cutting frame from the initial state to the depressed state until the cutting frame is switched to the depressed state; the cutting edge of the cutting knife does not protrude the edge of the pushing handle, and the cutting knife and the pushing handle are arranged in a staggered mode in the left-right direction; the cutting frame is connected with a second reset structure, and the second reset structure is used for driving the cutting frame in the depressed state to move towards the initial state.

[0008] Further, the cutting frame is hingedly connected to the supporting plate in the middle part, the second reset structure is a tension spring, one end of the second reset structure is connected to the bottom of the cutting frame, and the other end of the second reset structure is connected to the supporting plate.

[0009] Further, the inner side of the supporting plate is provided with a first positioning column, and the first positioning column is used for abutting against the cutting frame in the initial state.

[0010] Further, the cutting frame is hingedly connected to the supporting plate in the middle part, the second reset structure is a tension spring, one end of the second reset structure is connected to the bottom of the cutting frame, and the other end of the second reset structure is connected to the supporting plate.

[0011] Further, the linkage comprises a connecting rod, one end of the connecting rod is hingedly connected to the front pressing frame, and the other end of the connecting rod is hingedly connected to the rear pressing frame.

[0012] Further, the supporting plate is provided with a second positioning column, the connecting rod is provided with a positioning groove, and in the pressed state, the second positioning column is embedded in the positioning groove and abuts against the side wall of the positioning groove.

[0013] Further, the first reset structure is a tension spring, one end of the first reset structure is connected to the supporting plate, and the other end of the first reset structure is connected to the front pressing frame or the rear pressing frame.

[0014] Further, the front side of the supporting plate is provided with a guide plate, and the guide plate is upwardly and rearwardly inclined.

[0015] The utility model has the following beneficial effects:

[0016] Through cooperation of the supporting frame and the side conveying belt, the carton can be stably conveyed on the supporting plate, ensuring continuity and stability of the bottom sealing process. The front pressing frame and the rear pressing frame work cooperatively, so that the adhesive tape can be accurately pressed on the bottom of the carton, realizing rapid carton sealing and significantly improving carton sealing efficiency. Compared with a conventional carton sealing device adopting multiple driving mechanisms such as cylinders and motors, the utility model realizes cooperative movement of the front pressing frame and the rear pressing frame by connecting the two through the linkage, reduces the number of driving mechanisms, simplifies the structure design, and reduces equipment cost and maintenance difficulty. The movement of the front pressing frame is also switched to the adhesive pressing state under the pushing of the carton, and the front pressing frame is automatically pushed from the adhesive pressing state to the adhesive pressing standby state under the action of the first reset structure, realizing automatic cyclic operation of the carton sealing process, reducing manual intervention, and further improving operation stability and reliability of the equipment. The switching of the front pressing frame between the adhesive pressing standby state and the adhesive pressing state and the switching of the rear pressing frame between the top pressing state and the folding state ensure accurate adhesion of the adhesive tape on the bottom of the carton. Especially in the tail pressing stroke of the rear pressing frame, the rearward movement and height change of the rear pressing roller further compact the adhesive tape, ensuring the firmness and flatness of the carton sealing, and significantly improving the carton sealing quality. The mechanism has simple structure and does not have too many driving mechanisms, and only relies on the side conveying belt to drive the carton movement to drive cooperative movement of the front pressing frame and the rear pressing frame, so that the cost is low and the reliability is better.

[0017] In addition to the purposes, features and advantages described above, the utility model has other purposes, features and advantages. The utility model will be further described in detail below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0018] The drawings that form a part of this application are intended to provide further understanding of the utility model, and the schematic embodiments of the utility model and the description thereof are used to explain the utility model, and do not constitute undue limitation on the utility model. In the drawings:

[0019] Figure 1 It is the overall structure schematic view of the utility model;

[0020] Figure 2 It is the side perspective view of the utility model;

[0021] Figure 3 It is the connection structure schematic view of the front pressing frame, the rear pressing frame, the tape cutting mechanism and the connecting rod;

[0022] Figure 4 It is Figure 3 Sectional view perspective view;

[0023] Figure 5 It is Figure 3 Another sectional view perspective view of

[0024] Legend:

[0025] Carton 101, mounting plate 102;

[0026] Support frame 100, supporting plate 110, first positioning column 111, second positioning column 112, guide plate 120;

[0027] Side conveying belt 200;

[0028] Front pressing frame 300, front pressing roller 310;

[0029] Rear pressing frame 400, rear pressing roller 410, first reset structure 401;

[0030] Belt cutting mechanism 500, belt cutting frame 510, poking handle 511, cutting knife 520, second reset structure 530, protective cover 540, extension strip 541;

[0031] Connecting rod 600, positioning groove 610;

[0032] Adhesive tape roller 700. DETAILED DESCRIPTION

[0033] It should be understood that the specific embodiments described herein are merely exemplary and are not intended to limit the present application.

[0034] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0035] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly.

[0036] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features with "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of those skilled in the art, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the scope of protection required by the present application.

[0037] Please refer toFigure 1 And Figure 2 The utility model provides a food packaging carton bottom sealing mechanism in one preferred embodiment, including support frame 100, side conveying belt 200, front pressing frame 300, rear pressing frame 400 and first reset structure 401.

[0038] Support frame 100 includes the left and right two interval arrangement's supporting plate 110 for supporting carton 101.

[0039] The side conveying belt 200 is located the outside of two supporting plates 110, and is used to drive carton 101 to convey to the rear on the supporting plate 110, that is, two supporting plates 110 are located the position below the middle of two side conveying belts 200. It can be understood that in order to adapt to carton 101 of different width, the side conveying belt 200 can be movably installed in the left and right direction on the support frame 100, so that the interval can be adjusted to adapt to carton 101 of different width, and the bottom of the support frame 100 can be slidably installed with a mounting frame in the left and right direction, and the side conveying belt 200 is installed on the mounting frame.

[0040] The front pressing frame 300 is hinged between the two supporting plates 110, and a front pressing roller 310 is rotatably installed on the top of the front pressing frame 300 and can rotate along its axis. The front pressing frame 300 has a waiting pressing state and a pressing state. In the waiting pressing state, the upper end of the front pressing roller 310 is higher than the upper end of the supporting plate 110. In the pressing state, the front pressing roller 310 is pressed by the carton 101 on the supporting plate 110 and presses the adhesive tape on the bottom of the carton 101, so that the adhesive tape is fully pressed on the bottom of the carton 101 as the carton 101 moves. It can be understood that an adhesive tape roller 700 is installed below the supporting plate 110, and a roll of adhesive tape is installed on the adhesive tape roller 700. The side of the adhesive tape without glue is wound around the front pressing roller 310. When the carton 101 moves backward, the rear side of the carton 101 first contacts the front pressing roller 310 and the adhesive tape on the front pressing roller 310. The rear end of the adhesive tape first adheres to the rear side of the carton 101, and as the carton 101 continues to move backward, the front pressing roller 310 adheres the adhesive tape to the bottom of the carton 101 from the rear side of the carton 101. It can be understood that a guide roller for guiding the adhesive tape is arranged on the front pressing frame 300. The rear pressing frame 400 is hinged between the two supporting plates 110 and is located behind the front pressing frame 300. A rear pressing roller 410 is rotatably installed on the top of the rear pressing frame 400 and can rotate along its axis. The rear pressing frame 400 has a top-up state and a folding state. In the top-up state, the upper end of the rear pressing roller 410 is higher than the upper end of the supporting plate 110. In the folding state, the height of the rear pressing roller 410 is lower than that in the top-up state and can allow the carton 101 to pass, that is, the height of the upper end of the rear pressing roller 410 is flush or close to flush with the upper end of the supporting plate 110, and the rear pressing roller 410 adheres to the bottom of the carton 101, so as to further compact the adhesive tape. The rear pressing frame 400 is connected to the front pressing frame 300 through a linkage transmission. When the rear pressing frame 400 is in the top-up state, the front pressing frame 300 is in the waiting pressing state. When the rear pressing frame 400 is in the folding state, the front pressing frame 300 is in the pressing state, that is, the rear pressing roller 410 and the front pressing roller 310 simultaneously open upward or fold downward. During the movement from the folding state to the top-up state, the rear pressing frame 400 has at least a tail pressing stroke. In the tail pressing stroke, the rear pressing roller 410 moves backward due to the rotation of the rear pressing frame 400, and the height of the rear pressing roller 410 gradually increases during the backward movement, so that when the carton 101 gradually separates from the rear pressing roller 410, the rear pressing roller 410 wipes the adhesive tape from the bottom of the carton 101 to the front side of the carton 101, ensuring that the front end of the adhesive tape on the bottom extends to the front side of the carton 101. It can be understood that when the carton 101 enters the supporting plate 110, the paperboard on the bottom of the carton 101 has been folded inward and covers the opening on the bottom. It can be understood that the folding of the paperboard on the bottom of the carton 101 can be achieved by manual or mechanical equipment.

[0041] As Figure 3As shown, in order to realize the overall installation of the front pressing frame 300 and the rear pressing frame 400 on the supporting plate 110, two installation plates 102 are detachably installed in the inner sides of the two supporting plates 110, the installation plates 102 are fixedly installed on the supporting plate 110, and the components installed on the installation plates 102 are equivalent to being indirectly installed on the supporting plate 110. When installing, the front pressing frame 300 and the rear pressing frame 400 can be installed on the installation plate 102 first, and then the installation plate 102 is fixedly installed on the supporting plate 110, so that the front pressing frame 300 and the rear pressing frame 400 are conveniently installed in the open space and then integrally installed on the supporting plate 110, facilitating installation.

[0042] The first reset structure 401 is used to push the front pressing frame 300 in the glue pressing state to return to the waiting pressing state.

[0043] In one preferred embodiment of the food packaging carton bottom sealing mechanism provided by the utility model, through cooperation of the supporting frame 100 and the side conveying belt 200, the carton 101 can be stably conveyed on the supporting plate 110, ensuring continuity and stability of the bottom sealing process. The cooperative work of the front pressing frame 300 and the rear pressing frame 400 enables the adhesive tape to be accurately pressed and pasted on the bottom of the carton, realizing rapid carton sealing and significantly improving carton sealing efficiency. Compared with the conventional carton sealing device adopting multiple driving mechanisms such as cylinders and motors, the utility model connects the rear pressing frame 400 and the front pressing frame 300 through the linkage member, realizes cooperative movement of the two, reduces the number of driving mechanisms used, simplifies the structure design, and reduces equipment cost and maintenance difficulty. The movement of the front pressing frame 300 is also switched to the glue pressing state under the pushing of the carton 101, and the front pressing frame 300 is automatically pushed from the glue pressing state to the waiting pressing state under the action of the first reset structure 401, without setting an additional driving mechanism to drive movement of the front pressing frame 300 and the rear pressing frame 400; the utility model realizes automatic cyclic operation of the carton sealing process, reduces manual intervention, and further improves operation stability and reliability of the equipment. Switching of the waiting pressing state and the glue pressing state of the front pressing frame 300 and switching of the upper pressing state and the folding state of the rear pressing frame 400 ensure accurate pasting of the adhesive tape on the bottom of the carton. Especially in the tail pressing stroke of the rear pressing frame 400, the rearward movement and height change of the rear pressing roller 410 further compact the adhesive tape, ensuring firmness and flatness of the carton sealing and significantly improving carton sealing quality. The mechanism has simple structure and no excessive driving mechanisms, and only relies on the side conveying belt 200 to drive movement of the carton 101 to drive cooperative movement of the front pressing frame 300 and the rear pressing frame 400, so that the cost is low and the reliability is better.

[0044] Referring to Figures 2 to 4In some embodiments of the utility model, still include cutting tape mechanism 500, be located between front presser frame 300, rear presser frame 400 and between two supporting plate 110, be used for cutting off to the tape that passes above, cutting tape mechanism 500 further optimized the bottom sealing process. By setting up cutting tape mechanism 500 between front presser frame 300 and rear presser frame 400, realize the automatic cutting function of tape. When carton 101 bottom crosses front presser frame 300 and cutting tape mechanism 500, the tape of carton 101 bottom front side has not been cut off, and cutting tape mechanism 500 can cut off the connection of the tape on carton 101 bottom and front presser frame 300, so that carton 101 subsequent movement is not affected by the tape, and the tape after cutting off can be pasted to the next carton 101. Not only improve the continuity of bottom sealing operation, also avoid the problem that the box is not firm or the appearance is not beautiful due to the tape being too long, further improve the box sealing quality.

[0045] Referring to Figures 2 to 4In a further embodiment of this utility model, the tape cutting mechanism 500 includes a tape cutting frame 510, the tape cutting frame 510 is provided with a toggle handle 511, and the tape cutting frame 510 is provided with a cutting blade 520; the tape cutting frame 510 has a pressed state and an initial state, and the tape cutting frame 510 is movably mounted on the tray 110 to realize the switching between the pressed state and the initial state; in the initial state, the blade of the cutting blade 520 is higher than the top of the tray 110; in the pressed state, the blade of the cutting blade 520 is lower than the top of the tray 110; the toggle handle 511 is used to contact the rearward moving carton 101 and push the carton 101. The tape cutter 510 is moved from its initial state to a downward pressing state until it switches to the pressing state. The blade of the cutting knife 520 does not protrude beyond the edge of the actuating handle 511, and the cutting knife 520 and the actuating handle 511 are offset from each other in the left-right direction. It can be understood that in order for the cutting knife 520 to cut the tape, it is positioned in the middle of the left-right direction to cut the tape attached to the middle of the bottom of the carton 101. The cutting knife 520 and the actuating handle 511 are offset from each other in the left-right direction, with the actuating handle 511 located to the left or right of the cutting knife 520. The actuating handle 511 is used to prevent it from contacting the tape and affecting the tape cutting. A second reset structure 530 is connected to the tape cutter 510, which is used to push the tape cutter 510 from the pressing state back to the initial state. The fact that the cutting blade 520 does not protrude beyond the edge of the actuating handle 511 ensures that the carton 101 remains in contact with the actuating handle 511 as it passes the cutting blade 520. The cutting blade 520 will not damage the carton 101. Only when the carton 101 passes the actuating handle 511 and the cutting blade 520 does the cutting blade 520 spring upwards under the action of the second reset structure 530, cutting the tape. The switching between the pressed-down state and the initial state of the tape cutter 510 allows the cutting blade 520 to automatically complete the cutting action under the push of the carton 101, while the second reset structure 530 ensures that the tape cutter 510 can automatically return to its initial state, thus automating the cutting operation.

[0046] Reference Figures 2 to 4 In a further embodiment of this utility model, the cutting frame 510 is hinged to the support plate 110 at its center. The second reset structure 530 is a tension spring, with one end connected to the bottom of the cutting frame 510 and the other end connected to the support plate 110. The bottom of the cutting frame 510 and the support plate 110 are typically provided with columnar structures for the tension spring end to hook onto. The use of the tension spring ensures that the cutting frame 510 can quickly reset after completing the cutting action, optimizing the continuity of the bottom sealing process.

[0047] Reference Figures 2 to 4In further embodiments of the present application, the inner side of the supporting plate 110 is provided with a first positioning column 111, which is used to abut against the cutting tape frame 510 in the initial state. The tension spring can pull the cutting tape frame 510 to abut against the first positioning column 111, so as to maintain the initial state when no external force is applied. The first positioning column 111 on the inner side of the supporting plate 110 provides stable limiting support for the cutting tape frame 510 in the initial state. Not only the stability of the cutting tape mechanism 500 is improved, but also the accurate position of the cutting knife 520 in the initial state is ensured.

[0048] With reference to Figures 2 to 4 In further embodiments of the present application, the cutting tape frame 510 is hingedly connected with a protective cover 540, so as to shield the blade of the cutting knife 520 in the initial state. By hingedly connecting the protective cover 540 with the cutting tape frame 510, the blade of the cutting knife 520 in the initial state is shielded, so as to avoid accidental contact of the blade by the operator, improve the safety of the equipment, and reduce the operation risk. It can be understood that, in order to reset the protective cover 540, a torsion spring is installed on the hinge shaft of the protective cover 540 and the cutting tape frame 510, so that the protective cover 540 can be reset to the state of shielding the blade of the cutting knife 520 without external structure interference. In addition, in order to avoid shielding the blade of the cutting knife 520 by the protective cover 540 when cutting the adhesive tape, an extension strip 541 is arranged on the side of the protective cover 540, so that when the cutting tape frame 510 and the cutting knife 520 just reach the initial state, the extension strip 541 is still higher than the upper end of the supporting plate 110, so that when the carton 101 continues to move, the extension strip 541 can drive the protective cover 540 to move relative to the cutting knife 520, so as to open the upper space of the cutting knife 520 and cancel the shielding of the cutting knife 520. When the carton 101 moves backward, the carton 101 will first pass the actuating handle 511 and thus be out of contact with the actuating handle 511, so that the cutting knife 520 is popped up upward without being shielded by the protective cover 540, and the cutting of the adhesive tape is realized.

[0049] With reference to Figures 2 to 5 In further embodiments of the present application, the linkage member includes a connecting rod 600, one end of which is hingedly connected with the front pressing frame 300, and the other end of which is hingedly connected with the rear pressing frame 400. The linkage member realizes the cooperative movement of the two, simplifies the structure of the equipment, improves the synchronism and stability of the bottom sealing operation, and ensures the efficiency and reliability of the sealing process.

[0050] With reference to Figure 2 and Figure 5In further embodiments of the utility model, the second positioning column 112 is embedded in the positioning groove 610 and abuts against the side wall of the positioning groove 610 in the pressing state. When moving towards the glue pressing state, the second positioning column 112 is separated from the positioning groove 610 and does not interfere with the movement of the connecting rod 600, the front pressing frame 300 and the rear pressing frame 400. The second positioning column 112 on the supporting plate 110 and the positioning groove 610 on the connecting rod 600 are designed to provide accurate positioning function for the state switching of the front pressing frame 300 and the rear pressing frame 400. In the pressing state, the second positioning column 112 is embedded in the positioning groove 610, ensuring that the front pressing frame 300 and the rear pressing frame 400 remain in the correct position, further optimizing the accuracy and stability of the bottom sealing process.

[0051] With reference to Figure 4 In further embodiments of the utility model, the first reset structure 401 is a tension spring, one end of the first reset structure 401 is connected with the supporting plate 110, and the other end is connected with the front pressing frame 300 or the rear pressing frame 400. The use of the tension spring ensures that the front pressing frame 300 can quickly return to the pressing state after completing the glue sealing action, realizing the automation cycle of the bottom sealing operation.

[0052] With reference to Figure 4 In further embodiments of the utility model, the front side of the supporting plate 110 is provided with an inlet plate 120, and the inlet plate 120 is upwardly and rearwardly inclined. The upwardly and rearwardly inclined inlet plate 120 provides a guiding function for the inlet of the carton 101. Not only improves the stability of the carton 101 entering the supporting frame 100, but also reduces the possible jamming or deviation of the carton 101 in the conveying process, further optimizing the smoothness and reliability of the bottom sealing process.

[0053] The above is only the preferred embodiment of the utility model, and is not used to limit the utility model. For those skilled in the art, the utility model can have various changes and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model shall be included in the protection scope of the utility model.

Claims

1. A food packaging carton bottom sealing mechanism characterized by, The application relates to a paper box conveying device. The device comprises a support frame (100) which comprises two support plates (110) arranged at intervals and used for supporting a paper box (101); two side conveying belts (200) which are arranged at intervals and located outside the two support plates (110) and used for driving the paper box (101) to move backward on the support plates (110); a front pressing frame (300) which is hinged between the two support plates (110), the top of the front pressing frame (300) is rotatably provided with a front pressing roller (310), and the front pressing frame (300) has a waiting pressing state and a pressing state; in the waiting pressing state, the upper end of the front pressing roller (310) is higher than the upper end of the support plate (110); in the pressing state, the front pressing roller (310) is pressed below by the paper box (101) on the support plate (110) and is used for pressing adhesive tape on the bottom of the paper box (101); a rear pressing frame (400) which is hinged between the two support plates (110) and located behind the front pressing frame (300), the top of the rear pressing frame (400) is rotatably provided with a rear pressing roller (410), and the rear pressing frame (400) has a top-up state and a folding state; in the top-up state, the upper end of the rear pressing roller (410) is higher than the upper end of the support plate (110); in the folding state, the height of the rear pressing roller (410) is lower than that in the top-up state and can be crossed by the paper box (101); the rear pressing frame (400) is connected with the front pressing frame (300) through a linkage transmission, the rear pressing frame (400) is in the top-up state, and the front pressing frame (300) is in the waiting pressing state; the rear pressing frame (400) is in the folding state, and the front pressing frame (300) is in the pressing state; and during the movement from the folding state to the top-up state, the rear pressing frame (400) has at least a tail pressing stroke, in the tail pressing stroke, the rear pressing frame (400) rotates and moves backward and becomes higher; A first reset structure (401) is arranged and used for pushing the front pressing frame (300) in the pressing state to return to the waiting pressing state. The device further comprises a tape cutting mechanism (500) which is located between the front pressing frame (300) and the rear pressing frame (400) and between the two support plates (110) and is used for cutting the adhesive tape passing above. ​ ​ 2. The food packaging carton bottom sealing mechanism of claim 1, wherein, ​ 3. The food packaging carton bottom sealing mechanism of claim 2, wherein, The cutting mechanism (500) comprises a cutting frame (510) provided with a knob (511), and a cutting knife (520) is arranged on the cutting frame (510); the cutting frame (510) has a depressed state and an initial state, and the cutting frame (510) is movably arranged on a supporting plate (110) to realize switching between the depressed state and the initial state; in the initial state, a blade of the cutting knife (520) is higher than a top end of the supporting plate (110); in the depressed state, the blade of the cutting knife (520) is lower than the top end of the supporting plate (110); the knob (511) is used to contact a carton (101) moving rearward and drive the cutting frame (510) to move from the initial state to the depressed state under the pushing of the carton (101) until the switching to the depressed state; the blade of the cutting knife (520) does not protrude from an edge of the knob (511), and the cutting knife (520) and the knob (511) are arranged in a staggered manner in a left-right direction; a second reset structure (530) is connected to the cutting frame (510), and the second reset structure (530) is used to push the cutting frame (510) in the depressed state to move towards the initial state.

4. The food packaging carton bottom sealing mechanism of claim 3, wherein, The cutting frame (510) is hingedly connected to the supporting plate (110) in a middle portion, the second reset structure (530) is a tension spring, one end of the second reset structure (530) is connected to a bottom portion of the cutting frame (510), and the other end of the second reset structure (530) is connected to the supporting plate (110).

5. The food packaging carton bottom sealing mechanism of claim 4, wherein, A first positioning column (111) is arranged on an inner side of the supporting plate (110), and the first positioning column (111) is used to abut against the cutting frame (510) in the initial state.

6. The food packaging carton bottom sealing mechanism of claim 3, wherein, A protective cover (540) is hingedly connected to the cutting frame (510) to shield the blade of the cutting knife (520) in the initial state.

7. The food packaging carton bottom sealing mechanism of claim 1, wherein, The linkage comprises a connecting rod (600), one end of the connecting rod (600) is hingedly connected to the front pressing frame (300), and the other end of the connecting rod (600) is hingedly connected to the rear pressing frame (400).

8. The food packaging carton bottom sealing mechanism of claim 7, wherein, A second positioning column (112) is arranged on the supporting plate (110), and the connecting rod (600) is provided with a positioning groove (610); in the waiting pressing state, the second positioning column (112) is embedded in the positioning groove (610) and abuts against a side wall of the positioning groove (610).

9. The food packaging carton bottom sealing mechanism of claim 1, wherein, The first reset structure (401) is a tension spring, one end of the first reset structure (401) is connected to the supporting plate (110), and the other end of the first reset structure (401) is connected to the front pressing frame (300) or the rear pressing frame (400).

10. The food packaging carton bottom sealing mechanism of claim 1, wherein, A guide plate (120) is arranged on a front side of the supporting plate (110), and the guide plate (120) is upwardly and rearwardly inclined.

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