Sealing equipment

Abstract

The utility model discloses sealing equipment which comprises a conveying device used for conveying packaging boxes in the front-and-back direction, and a sealing device used for sealing the packaging boxes in the front-and-back direction. The sealing device comprises a first sealing plate, a second sealing plate and a sealing mechanism, the first sealing plate extends in the front-back direction and is located above the conveying device and on the advancing path of the unfolded first folded edge, and the second sealing plate extends in the front-back direction and is located in front of the first sealing plate; the second sealing plate is located on the advancing path of the second folded edge, the upper surface of the rear end of the second sealing plate inclines from bottom to top, and the sealing mechanism is located on one side of the conveying device. According to the technical scheme, through the continuous conveying process and the automatic folding process, the sealing equipment greatly improves the production efficiency, reduces dependence of manual operation and has high automation. And due to the design of the sealing device, the folding process of the folded edge is accurate and controllable, and the sealing quality is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of packaging, in particular to a sealing device. Background Art

[0002] Rectangular packaging boxes are a common packaging container. In the food industry, pre-prepared dishes, cakes, beverages and other products are often packaged in rectangular packaging boxes. There are four folded edges at the end of the rectangular packaging box. The operator will first fold these four folded edges skillfully to form an open opening as the entrance for the material to be placed in the packaging box. When the material is placed, the next step is to fold the four folded edges inward to close the packaging box to ensure that the material will not fall or be damaged during transportation and storage. This packaging method obviously wastes labor. In the context of modern industrial production, labor costs are rising day by day. Relying on manual folding of folded edges not only increases the operating costs of enterprises, but also limits the expansion of production scale. Utility Model Content

[0003] Therefore, it is necessary to provide a sealing device to solve the problem of manually folding the edges of the packaging box.

[0004] To achieve the above object, the inventor provides a sealing device, comprising:

[0005] A conveying device, the conveying device is used to convey the packaging box in the front-to-back direction, the packaging box is a rectangular parallelepiped, and four folded edges are provided at its ends along the left-right direction, the four folded edges are sequentially a first folded edge, a second folded edge, a third folded edge, and a fourth folded edge, the first folded edge is opposite to the third folded edge, and the second folded edge is opposite to the fourth folded edge; and

[0006] A sealing device, the sealing device comprises a first sealing plate, a second sealing plate and a sealing mechanism, the first sealing plate extends in the front-to-back direction, is located above the conveying device, and is located on the travel path of the unfolded first folded edge, so that the unfolded first folded edge is folded inwardly and against the inner side of the first sealing plate, the second sealing plate extends in the front-to-back direction, is located in front of the first sealing plate, and is located on the travel path of the second folded edge, the rear end upper surface of the second sealing plate is inclined from bottom to top, so that the unfolded second folded edge is folded inwardly and against the inner side of the second sealing plate, and the sealing mechanism is located on one side of the conveying device, and is used to fold the unfolded third folded edge inwardly and against the inner side of the first sealing plate, and to fold the unfolded fourth folded edge inwardly and against the outer side of the second sealing plate.

[0007] Furthermore, the rear end upper surface of the second sealing plate is located below the front end lower surface of the first sealing plate, and a guide groove for folding the unfolded second folded edge inward is formed between the rear end upper surface of the second sealing plate and the front end lower surface of the first sealing plate.

[0008] Furthermore, the upper surface of the rear end of the second sealing plate is arc-shaped.

[0009] Furthermore, the second sealing plate is provided with a glue groove, which extends to the front end of the second sealing plate, and the glue groove can expose the second folded edge after being folded inward, and the folded fourth folded edge covers part of the glue groove.

[0010] Furthermore, the sealing mechanism includes a first motor, a first sealing block, a second motor and a second sealing block. The output shaft of the first motor is transmission-connected to the first sealing block, and the first sealing block rotates following the rotation of the output shaft of the first motor. The first sealing block is located on one side of the first sealing plate, and the rotating shaft of the first sealing block extends in the up-down direction to push the unfolded third folded edge to fold inward and against the inner side of the first sealing plate. The output shaft of the second motor is transmission-connected to the second sealing block, and the second sealing block rotates following the rotation of the output shaft of the second motor. The second sealing block is located on one side of the second sealing plate, and the rotating shaft of the second sealing block extends in the left-right direction to push the unfolded fourth folded edge to fold inward and against the outer side of the second sealing plate.

[0011] Furthermore, the first sealing block is L-shaped, one end of the L-shape is drivingly connected to the output shaft of the first motor, and the other end of the L-shape can be rotated to the inner side of the first sealing plate.

[0012] Furthermore, the packaging box is provided with four folding edges at both ends along the left and right directions, and the sealing device includes two sealing units, one first sealing plate, one second sealing plate and one sealing mechanism form a sealing unit, and the two sealing units are symmetrically arranged on both sides of the conveying device.

[0013] Furthermore, it also includes a gluing device, which is arranged on one side of the conveying device and is used to apply glue on the second folded edge or the fourth folded edge. The second sealing plate is provided with a glue groove, which extends to the rear end of the second sealing plate. The glue groove can expose the second folded edge after being folded inward, and the folded fourth folded edge covers the gluing position.

[0014] Furthermore, the conveying device is a conveyor belt, and the belt of the conveyor belt is provided with a limiting structure to prevent the packaging box from shifting.

[0015] Furthermore, the limiting structure includes a plurality of limiting plates, and the plurality of limiting plates are arranged at intervals on the belt of the conveyor belt, and two adjacent limiting plates are in contact with two end portions of the packaging box along the front-to-back direction to clamp the packaging box.

[0016] Different from the prior art, the above technical solution has the following beneficial effects:

[0017] Through continuous conveying and automated folding process, the sealing equipment greatly improves production efficiency, reduces reliance on manual operation, and has a high degree of automation. The design of the sealing device makes the folding process of the folded edge precisely controllable, ensuring that each folded edge is accurately in place, improving the quality of the seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the structure of the sealing device in this embodiment;

[0019] Figure 2 Schematic diagram of the four folded edges of the packaging box in the present embodiment in an unfolded state;

[0020] Figure 3 is a schematic diagram of the first folded edge being folded inwards in this embodiment;

[0021] Figure 4 is a schematic diagram of the third folded edge being folded inwards in this embodiment;

[0022] Figure 5 is a schematic diagram of the second folded edge being folded inwards in this embodiment;

[0023] Figure 6 Schematic diagram of the glue tank in this embodiment;

[0024] Figure 7 Schematic diagram of the fourth folded edge folded inwards in this embodiment.

[0025] Description of reference numerals:

[0026] 1. Packing box;

[0027] 11. First folding edge; 12. Second folding edge; 13. Third folding edge; 14. Fourth folding edge;

[0028] 2. Conveying device;

[0029] 21. belt; 22. limit plate;

[0030] 3. Gluing device;

[0031] 4. Sealing device;

[0032] 41. first sealing plate; 42. second sealing plate; 43. first sealing block; 44. second sealing block;

[0033] 45. first motor; 46. second motor; 47. channel; 48. guide groove; 49. glue groove;

[0034] 5. Feeding device. DETAILED DESCRIPTION

[0035] In order to explain in detail the possible application scenarios, technical principles, specific schemes that can be implemented, and the purposes and effects that can be achieved, the following is a detailed description of the specific embodiments listed in conjunction with the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0036] Reference to "embodiment" herein means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The term "embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or association with other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the various technical features mentioned in the embodiments can be combined in any way to form a corresponding implementable technical solution.

[0037] Unless otherwise defined, the technical terms used in this document have the same meanings as those generally understood by those skilled in the art to which this application belongs; the use of relevant terms in this document is only for describing specific embodiments and is not intended to limit this application.

[0038] In the description of this application, the term "and / or" is an expression used to describe the logical relationship between objects, indicating that three relationships may exist, for example, A and / or B, which means: A exists, B exists, and A and B exist at the same time. In addition, the character " / " in this article generally indicates that the objects before and after are in an "or" logical relationship.

[0039] In the present application, terms such as “first” and “second” are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship of quantity, priority or sequence between these entities or operations.

[0040] Without further limitations, in this application, the words "include", "comprises", "has" or other similar expressions used in the sentences are intended to cover non-exclusive inclusion. These expressions do not exclude the presence of additional elements in the process, method or product including the elements, so that the process, method or product including a series of elements may include not only those limited elements, but also other elements not explicitly listed, or also include elements inherent to such process, method or product.

[0041] Similar to the understanding in the Examination Guidelines, in this application, expressions such as "greater than", "less than", "exceed" and the like are understood to exclude the number itself; expressions such as "above", "below", "within" and the like are understood to include the number itself. In addition, in the description of the embodiments of this application, "multiple" means more than two (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups", "multiple times", etc., unless otherwise clearly and specifically limited.

[0042] In the description of the embodiments of the present application, space-related expressions used, such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or position relationship based on the orientation or position relationship shown in the specific embodiments or drawings, and are only for the convenience of describing the specific embodiments of the present application or facilitating the reader's understanding, and do not indicate or imply that the referred device or component must have a specific position, a specific orientation, or be constructed or operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0043] Unless otherwise expressly specified or limited, in the description of the embodiments of the present application, the terms such as "install", "connect", "connect", "fix", "set", etc. used should be understood in a broad sense. For example, the "connection" can be a fixed connection, a detachable connection, or an integrated setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For technicians in the technical field to which the present application belongs, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0044] See also Figure 1 , this embodiment provides a sealing device, including:

[0045] A conveying device 2 is used to convey the packaging box 1 in the front-to-back direction. The packaging box 1 is a rectangular parallelepiped, and four folded edges are provided at its ends along the left-right direction. The four folded edges are sequentially a first folded edge 11, a second folded edge 12, a third folded edge 13, and a fourth folded edge 14. The first folded edge 11 is opposite to the third folded edge 13, and the second folded edge 12 is opposite to the fourth folded edge 14; and

[0046] The sealing device 4 includes a first sealing plate 41, a second sealing plate 42 and a sealing mechanism. The first sealing plate 41 extends in the front-to-back direction and is located above the conveying device 2 and on the travel path of the unfolded first folded edge 11, so that the unfolded first folded edge 11 is folded inward and against the inner side of the first sealing plate 41. The second sealing plate 42 extends in the front-to-back direction and is located in front of the first sealing plate 41 and on the travel path of the second folded edge 12. The upper surface of the rear end of the second sealing plate 42 is inclined from bottom to top. So that the unfolded second folded edge 12 is folded inward and rests against the inner side of the second sealing plate 42, and the gap between the rear end of the second sealing plate 42 and the front end of the first sealing plate 41 along the front-to-back direction is smaller than the length of the first folded edge 11, so that the folded first folded edge 11 rests against the inner side of the second sealing plate 42. The sealing mechanism is located on one side of the conveying device 2, and is used to fold the unfolded third folded edge 13 inward and rest against the inner side of the first sealing plate 41, and to fold the unfolded fourth folded edge 14 inward and rest against the outer side of the second sealing plate 42.

[0047] See also Figure 2 , the packaging box 1 is a paper packaging box 1, a plastic packaging box 1, etc. The packaging box 1 is unfolded in the previous process and placed on the conveying device 2. Among the four folded edges, the first folded edge 11 is located in the front, the second folded edge 12 is located at the bottom, the third folded edge 13 is located at the back, and the fourth folded edge 14 is located at the top, with the forward direction of the packaging box 1 being the front. The four folded edges after unfolding form an open shape to accommodate materials. The materials can be food, cosmetics, office supplies, plant lights, etc. Preferably, the materials are food-sealed pre-prepared dishes. The four unfolded folded edges are folded under the action of the sealing device 4 to form closed ends, which can ensure the sealing of the materials during transportation and storage.

[0048] The packaging box 1 moves forward following the conveying of the conveying device 2, and the first folded edge 11 contacts the first sealing plate 41, and is folded inward and against the inner side of the first sealing plate 41. Figure 3 As shown, and slide along the inner side of the first sealing plate 41. After the first folded edge 11 is folded inward, the sealing mechanism folds the unfolded third folded edge 13 inward and against the inner side of the first sealing plate 41. The structure is as shown Figure 4As shown, the third folded edge 13 also slides along the inner side of the first sealing plate 41. At this time, the second folded edge 12 and the fourth folded edge 14 are not folded inward, and are located on the upper and lower sides of the first sealing plate 41, passing through the upper and lower sides of the first sealing plate 41. The structure is as shown in FIG. Figure 4 After the third folded edge 13 is folded inward, the second folded edge 12 contacts the second sealing plate 42. The rear end of the second sealing plate 42 is inclined, guiding the second folded edge 12 to gradually fold inward. The structure is as shown in FIG. Figure 5 As shown, it finally leans against the inner side of the second sealing plate 42 and slides along the inner side of the second sealing plate 42. Since the first folded edge 11 is folded before the second folded edge 12, and the gap between the rear end of the second sealing plate 42 and the front end of the first sealing plate 41 in the front-to-back direction is smaller than the length of the first folded edge 11, the first folded edge 11 will not run out from between the rear end of the second sealing plate 42 and the front end of the first sealing plate 41, and will seamlessly enter the inner side of the second sealing plate 42. After the second folded edge 12 is folded inward, it leans against the outer side of the first folded edge 11 and the third folded edge 13. After the second folded edge 12 is folded inward, the fourth folded edge 14 is left unfolded, and the structure is as shown in FIG. Figure 6 As shown, the sealing mechanism causes the unfolded fourth folded edge 14 to be folded inward and against the outer side of the second sealing plate 42. The structure is as shown in FIG. Figure 7 As shown, the fourth folded edge 14 slides along the outer side of the second sealing plate 42. When the packaging box 1 is separated from the second sealing plate 42, the fourth folded edge 14 leans against the outer sides of the third folded edge 13, the second folded edge 12, and the first folded edge 11.

[0049] Through continuous conveying and automated folding process, the sealing equipment greatly improves production efficiency, reduces reliance on manual operation, and has a high degree of automation. The design of the sealing device makes the folding process of the folded edge precisely controllable, ensuring that each folded edge is accurately in place, improving the quality of the seal.

[0050] See also Figure 3 In this embodiment, the second folded edge 12 is located below the fourth folded edge 14 , and a channel 47 for the unfolded second folded edge 12 to pass through is formed between the first sealing plate 41 and the conveying device 2 .

[0051] See also Figure 5In this embodiment, the rear upper surface of the second sealing plate 42 is located below the front lower surface of the first sealing plate 41, and a guide groove 48 is formed between the rear upper surface of the second sealing plate 42 and the front lower surface of the first sealing plate 41 to fold the unfolded second folded edge 12 inward. Preferably, the rear upper surface of the second sealing plate 42 is arc-shaped, which can better guide the second folded edge 12 to fold inward. The width of this guide groove 48 is designed according to the size of the second folded edge 12, which is slightly larger than the thickness of the second folded edge 12, in order to provide a stable and smooth folding path for it. When the packaging box 1 moves forward with the conveying device 2, the second folded edge 12 gradually approaches the second sealing plate 42. Due to the arc-shaped design of the rear upper surface of the second sealing plate 42 and the guide groove 48 formed between it and the front lower surface of the first sealing plate 41, the second folded edge 12 is naturally guided and folded inward. This folding process does not require any additional mechanical assistance and is completed entirely by the movement of the packaging box 1 itself and the guidance of the second sealing plate 42, thereby simplifying the structure of the equipment and reducing manufacturing costs and maintenance difficulties.

[0052] See also Figure 5 In this embodiment, the second sealing plate 42 is provided with a glue groove 49, which extends to the rear end of the second sealing plate 42. The glue groove 49 can expose the second folded edge 12 after being folded inward, and the folded fourth folded edge 14 covers the part of the glue groove 49. The shape of the glue groove 49 can be designed according to the shape and size of the second folded edge 12 and the fourth folded edge 14 to ensure that the second folded edge 12 after being folded inward can be exposed. The position of the glue application also needs to be designed in advance so that it is accurately in the glue groove 49. The glue will be applied to the outside of the second folded edge 12 or the inside of the fourth folded edge 14, and is located in the glue groove 49. The glue groove 49 is in a long strip shape so that the glue will not be wiped off by the second sealing plate 42. When the fourth folded edge 14 is folded, it will cover the glue groove 49 to ensure that the glue is firmly sealed between the second folded edge 12 and the fourth folded edge 14.

[0053] See also Figure 6 In this embodiment, the sealing device further includes a glue coating device 3, which is disposed on one side of the conveying device 2 and is used to coat the second folded edge 12 or the fourth folded edge 14 with glue. The glue coating device 3 can adopt a contact or non-contact glue dispensing method, which is selected according to the accuracy and speed requirements of the glue coating. Preferably, the glue coating device 3 is located on one side of the glue groove 49, and glue is coated on the outer side of the second folded edge 12 folded inwardly through the glue groove 49, waiting for the fourth folded edge 14 behind to fold inwardly and cover the glue coating position. In some embodiments, the glue coating device 3 coats the glue on the inner side of the unfolded fourth folded edge 14.

[0054] See also Figure 1In this embodiment, the sealing mechanism includes a first motor 45, a first sealing block 43, a second motor 46 and a second sealing block 44. The output shaft of the first motor 45 is connected to the first sealing block 43, and the first sealing block 43 rotates following the rotation of the output shaft of the first motor 45. The first sealing block 43 is located on one side of the first sealing plate 41, and the rotation axis of the first sealing block 43 extends in the up-down direction to push the unfolded third folding edge 13 to fold inward and against the inner side of the first sealing plate 41. The output shaft of the second motor 46 is connected to the second sealing block 44, and the second sealing block 44 rotates following the rotation of the output shaft of the second motor 46. The second sealing block 44 is located on one side of the second sealing plate 42, and the rotation axis of the second sealing block 44 extends in the left-right direction to push the unfolded fourth folding edge 14 to fold inward and against the outer side of the second sealing plate 42.

[0055] By adjusting the speed of the motor and the shape of the sealing block, accurate folding of different folding edges can be achieved. When the packaging box 1 moves to one side of the first sealing plate 41, the first motor 45 is started to drive the first sealing block 43 to rotate left and right. The rotation of the first sealing block 43 pushes the unfolded third folding edge 13 to fold inward. The structure is as follows: Figure 4 Similarly, when the packaging box 1 continues to move to one side of the second sealing plate 42, the second motor 46 is started, driving the second sealing block 44 to rotate up and down, and the rotation of the second sealing block 44 pushes the unfolded fourth folding edge 14 to fold inwards, and the structure is as shown. Figure 7 As shown. The sealing block is driven by a motor to rotate in a specific direction, so as to realize efficient and accurate folding of the third folding edge 13 and the fourth folding edge 14. This mechanized operation method greatly improves the production efficiency and sealing quality of the sealing equipment.

[0056] The above embodiment utilizes two sealing blocks and two motors to realize folding the third folding edge 13 and the fourth folding edge 14. In some embodiments, a sealing block and a motor may be provided on the movable chassis to realize folding the third folding edge 13 and the fourth folding edge 14 respectively.

[0057] In this embodiment, the first motor 45 , the second motor 46 , and the glue coating device 3 are arranged on a fixing seat, and the fixing seat is located at one side of the conveying device 2 .

[0058] See also Figure 1In this embodiment, the first sealing block 43 is L-shaped, one end of the first sealing block 43 is drivingly connected to the output shaft of the first motor 45, and the other end of the first sealing block 43 can be rotated to the inner side of the first sealing plate 41, so that the third folded edge 13 can accurately enter the inner side of the first sealing block 43, and will not run out from the gap between the first sealing block 43 and the first sealing plate 41, resulting in failure to enter the inner side of the first sealing block 43. In some embodiments, the rotated first sealing block 43 can be flush with the first sealing plate 41, and the gap between the two is very small, so as to avoid the third folded edge 13 from running out as much as possible.

[0059] In this embodiment, four folding edges are provided at both ends of the packaging box 1 in the left-right direction, and the sealing device 4 includes two sealing units. A first sealing plate 41, a second sealing plate 42 and a sealing mechanism form a sealing unit, and the two sealing units are symmetrically arranged on both sides of the conveying device 2. One sealing unit corresponds to an end opening, and the folding edge at the end position is operated to be folded to be closed. After folding, the two folding edges of the packaging box 1 are successfully sealed, completing the entire sealing process, and the packaging box 1 forms a rectangular parallelepiped shape. By adopting the design of two sealing units, the sealing equipment can handle the two end openings of the packaging box 1 at the same time, thereby greatly improving the production efficiency.

[0060] See also Figure 1 In this embodiment, the conveying device 2 is a conveyor belt. The belt 21 of the conveyor belt is usually made of wear-resistant and tensile-resistant materials, which can ensure the stability of the packaging box 1 during the conveying process. The design of the conveyor belt ensures the stability of the packaging box 1 during the conveying process, and reduces problems such as poor sealing caused by shaking or tilting.

[0061] In some embodiments, the conveying device 2 may adopt a roller type or a chain plate type conveying method.

[0062] See also Figure 1 In this embodiment, the conveyor belt 21 is provided with a limiting structure to prevent the packaging box 1 from shifting.

[0063] See also Figure 1 and Figure 2In this embodiment, the limiting structure includes a plurality of limiting plates 22. A plurality of limiting plates 22 are arranged at intervals on the conveyor belt 21. Two adjacent limiting plates 22 contact the two ends of the packaging box 1 along the front-to-back direction to clamp the packaging box 1, ensure the stability of the packaging box 1 during transportation, and prevent the packaging box 1 from leaving the preset position. The limiting plates 22 are fixed to the conveyor belt 21 by bolts or other connection methods, and the spacing is adjustable according to actual needs to accommodate packaging boxes 1 of different sizes. When the packaging box 1 is placed on the conveyor belt, its front and rear ends will contact the two adjacent limiting plates 22. Due to the clamping effect of the limiting plates 22, the packaging box 1 is not easy to shake or deviate during transportation.

[0064] In some embodiments, the limiting structure may be a plurality of friction strips disposed at intervals on the belt 21, which are in contact with the bottom of the packaging box 1 and prevent the packaging box 1 from shifting by a large friction force.

[0065] See also Figure 1 In this embodiment, the sealing device further includes a feeding device 5, which is located on one side of the conveying device 2 and behind the first sealing plate 41, and is used to push the material into the packaging box 1. By adding the feeding device 5, the automation of material delivery is realized, manual intervention and operation difficulty are reduced, and the automation degree of the entire packaging process is improved.

[0066] In this embodiment, the feeding device 5 includes a material table, a push plate and a linear motion mechanism. The material table is located on one side of the conveying device 2. The material is loaded on the material table, and the material is pushed by the push plate to be fed into the packaging box 1 on the conveying device 2. The push plate is located above the material table, and the push plate is connected to the linear motion mechanism. The linear motion mechanism is arranged in the left and right direction, and is used to drive the push plate to move left and right, thereby pushing the material to move along the packaging box 1 on the conveying device 2.

[0067] In this embodiment, the linear motion mechanism may be a pneumatic cylinder, an oil cylinder, an electric cylinder, etc.

[0068] It should be noted that although the above embodiments have been described in this article, this does not limit the scope of patent protection of the utility model. Therefore, based on the innovative concept of the utility model, changes and modifications to the embodiments described in this article, or equivalent structural or equivalent process changes made using the contents of the utility model specification and drawings, directly or indirectly applying the above technical solutions to other related technical fields are all included in the scope of protection of the utility model patent.

Claims

1. A sealing device, characterized in that: include: A conveying device, the conveying device is used to convey the packaging box in the front-to-back direction, the packaging box is a rectangular parallelepiped, and four folded edges are provided at its ends along the left-right direction, the four folded edges are sequentially a first folded edge, a second folded edge, a third folded edge, and a fourth folded edge, the first folded edge is opposite to the third folded edge, and the second folded edge is opposite to the fourth folded edge; as well as A sealing device, the sealing device comprises a first sealing plate, a second sealing plate and a sealing mechanism, the first sealing plate extends in the front-to-back direction, is located above the conveying device, and is located on the travel path of the unfolded first folded edge, so that the unfolded first folded edge is folded inwardly and against the inner side of the first sealing plate, the second sealing plate extends in the front-to-back direction, is located in front of the first sealing plate, and is located on the travel path of the second folded edge, the rear end upper surface of the second sealing plate is inclined from bottom to top, so that the unfolded second folded edge is folded inwardly and against the inner side of the second sealing plate, and the sealing mechanism is located on one side of the conveying device, and is used to fold the unfolded third folded edge inwardly and against the inner side of the first sealing plate, and to fold the unfolded fourth folded edge inwardly and against the outer side of the second sealing plate.

2. The sealing device according to claim 1, characterized in that: The rear end upper surface of the second sealing plate is located below the front end lower surface of the first sealing plate, and a guide groove for folding the unfolded second folded edge inward is formed between the rear end upper surface of the second sealing plate and the front end lower surface of the first sealing plate.

3. The sealing device according to claim 2, characterized in that: The rear end upper surface of the second sealing plate is arc-shaped.

4. The sealing device according to claim 1, characterized in that: The second sealing plate is provided with a glue groove, which extends to the front end of the second sealing plate. The glue groove can expose the second folded edge after being folded inward, and the folded fourth folded edge covers part of the glue groove.

5. The sealing device according to claim 1, characterized in that: The sealing mechanism includes a first motor, a first sealing block, a second motor and a second sealing block. The output shaft of the first motor is transmission-connected to the first sealing block, and the first sealing block rotates following the rotation of the output shaft of the first motor. The first sealing block is located at one side of the first sealing plate, and the rotation axis of the first sealing block extends in the up-down direction to push the unfolded third folded edge to fold inward and against the inner side of the first sealing plate. The output shaft of the second motor is transmission-connected to the second sealing block, and the second sealing block rotates following the rotation of the output shaft of the second motor. The second sealing block is located at one side of the second sealing plate, and the rotation axis of the second sealing block extends in the left-right direction to push the unfolded fourth folded edge to fold inward and against the outer side of the second sealing plate.

6. The sealing device according to claim 5, characterized in that: The first sealing block is L-shaped, one end of the L-shape is drivingly connected to the output shaft of the first motor, and the other end of the L-shape can be rotated to the inner side of the first sealing plate.

7. The sealing device according to any one of claims 1 to 6, characterized in that: The two ends of the packaging box along the left and right directions are each provided with four folding edges, the sealing device includes two sealing units, one first sealing plate, one second sealing plate and one sealing mechanism form a sealing unit, and the two sealing units are symmetrically arranged on both sides of the conveying device.

8. The sealing device according to claim 1, characterized in that: It also includes a glue coating device, which is arranged on one side of the conveying device and is used to coat glue on the second folded edge or the fourth folded edge. The second sealing plate is provided with a glue groove, which extends to the front end of the second sealing plate. The glue groove can expose the second folded edge after being folded inward, and the folded fourth folded edge covers the glue coating position.

9. The sealing device according to claim 1, characterized in that: The conveying device is a conveyor belt, and the belt of the conveyor belt is provided with a limiting structure to prevent the packaging box from shifting.

10. The sealing device according to claim 9, characterized in that: The limiting structure includes a plurality of limiting plates, and a plurality of the limiting plates are arranged at intervals on the belt of the conveyor belt. Two adjacent limiting plates are in contact with two end portions of the packaging box along the front-rear direction to clamp the packaging box.

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