Automatic closing device for box leaf of packaging box
By designing the automatic closing device of the packaging box box leaf, the automatic closing of the packaging box is achieved by using the cooperation of the turntable and the pressing rod, the problems of low packaging efficiency and high labor costs in the existing technology are solved, and the production efficiency and adaptation range are improved.
Patent Information
- Application Number
- CN202420910231.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-28
- Publication Date
- 2025-03-25
- Estimated Expiration
- 2034-04-28
AI Technical Summary
The lack of a device for automatically closing the packaging box leaves in the prior art leads to inefficient packaging efficiency and high labor costs.
An automatic closing device for packaging box box leaves is designed, including a turntable, drive assembly, press rod, adjusting member and closing member. Through the rotation of the turntable and the compression of the pressure rod, the automatic closing and closing of the packaging box box leaves is achieved.
It realizes automatic sealing of packaging boxes, improves packaging efficiency, reduces labor costs, and adapts to packaging boxes of different sizes and types.
Smart Images
Figure CN222663852U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of packaging box leaf closing tooling, in particular to an automatic packaging box leaf closing device. Background Art
[0002] At present, after the materials are produced and separated into several material groups, they need to be placed into the packaging box by the clamping tools on the production line. At present, most of the packaging boxes are square in design and have a containing groove for accommodating external material groups. Side box leaves are arranged on both sides of the packaging box, and a top box leaf is arranged on the top of the packaging box. The opening of the containing groove is initially closed by bending the side box leaves, and then the top box leaf is pushed so that the top box leaf is bent and pressed on the two side box leaves to achieve the closure of the containing groove. When the top box leaf is pressed on the opening of the containing groove, a certain gap is left between the front end of the top box leaf and the inner wall of the packaging box, and a clamping part is arranged at the front end of the top box leaf. The clamping part is bent and engaged with the gap to achieve the complete closure of the opening of the containing groove by the top box leaf, that is, the packaging of the packaging box is achieved. Most of the prior art methods involve manually breaking and closing the leaves of the packaging box, i.e., manually closing the packaging box. However, manually closing the packaging box makes the entire packaging efficiency low and the labor cost is too high. At present, there is a lack of a closing device that can automatically close the leaves of the packaging box on the production line. Utility Model Content
[0003] In view of the shortcomings of the prior art, the utility model provides an automatic closing device for leaves of a packaging box, in order to solve the problem that the packaging line in the prior art lacks a closing device for automatically closing leaves of the packaging box.
[0004] In order to achieve the above-mentioned purpose, the utility model provides an automatic closing device for box leaves of a packaging box, comprising a turntable and a driving assembly for driving the turntable to rotate, the turntable is circumferentially provided with a plurality of placement grooves for placing external packaging boxes, the turntable is provided with a first pressure rod, a pressure groove is formed between the first pressure rod and the turntable for causing the first pressure rod to press the side box leaves of the external packaging box when the turntable rotates, the height of the pressure groove is gradually reduced from the starting end of the first pressure rod to the end of the first pressure rod, a second pressure rod is provided on one side of the first pressure rod, and a pressure groove is formed between the second pressure rod and the turntable A limiting groove is provided, and a guiding portion is bent at the end of the second pressure rod toward the starting end of the first pressure rod, and a guiding groove is formed between the guiding portion and the first pressure rod, which is used to gradually close the top box leaves of the external packaging box when the turntable rotates and gradually place them into the limiting groove as the turntable rotates; a frame is provided on one side of the turntable, and an adjusting member for adjusting the distance between the first pressure rod and the turntable and a pressing member for temporarily pressing down the side box leaves when the side box leaves of the external packaging box gradually enter the compression groove are provided on the frame; a closing member for completely closing the top box leaves of the external packaging box is provided on one side of the frame.
[0005] The advantages of adopting the above technical solution are as follows: when the driving component drives the turntable to rotate, the packaging box placed in the slot will move accordingly. After the material is poured into one of the packaging boxes, the packaging box will gradually move toward the first pressure rod as the turntable rotates. At this time, the box leaves on both sides and the top box leaves of the packaging box are relatively perpendicular to the end face of the turntable. When the packaging box filled with material is close to the starting end of the first pressure rod, the side box leaves on one side of the packaging box first contact with the bottom of the first pressure rod, and the pressing member will bend the side box leaves on the other side of the packaging box toward the opening of the packaging box receiving slot, so that when the packaging box gradually enters the pressing slot, the bottom of the first pressure rod can press on the top of the side box leaves on both sides of the packaging box, and the height of the pressing slot is from the starting end of the first pressure rod to the end of the first pressure rod. The gradually narrowing arrangement, that is, the distance between the first pressure rod and the end face of the turntable is gradually narrowed from the starting end of the first pressure rod to the end end of the first pressure rod, so that when the turntable rotates, the side box leaves on both sides of the packaging box are gradually bent toward the opening of the packaging box receiving groove, that is, the side box leaves on both sides of the packaging box are pressed down, and at this time, the top box leaves of the packaging box are not compressed, and when the turntable drives the packaging box to move, the top box leaves of the packaging box gradually contact with the guide part, that is, the top box leaves gradually enter the guide groove, and the second pressure rod and the guide part are relatively inclined, so that the top box leaves of the packaging box gradually move toward the second pressure rod along the opening direction of the guide part, that is, the top box leaves are compressed by the guide part and bent toward the opening of the packaging box receiving groove until the top box leaves are placed in the limiting groove. After the leaves enter the limiting groove, they are limited by the second pressure rod to keep them in a bent state, that is, the bottom surface of the top box leaf is partially in contact with the top surfaces of the two side box leaves. At this time, the top box leaf and the packaging box are in a semi-closed state, so that the closing member can drive the top box leaf in the semi-closed state to make it fully closed, thereby realizing the closure of the packaging box; the above-mentioned technical setting realizes the automation of the closure of the packaging box, that is, the box leaves on both sides of the packaging box and the top box leaf are automatically closed to realize the closure of the packaging box, and the packaging efficiency of the packaging box is improved through automated closure, thereby improving the production efficiency of the entire assembly line, and at the same time, compared with the manual packaging method used in the prior art, this reduces labor cost expenditure and avoids the risk of damage to the packaging box due to manual packaging errors; the above-mentioned The adjusting member in the technology is used to adjust the distance between the first pressure rod and the turntable, so as to adapt to side box leaves of different widths, and then adapt to packaging boxes of different sizes, so as to improve the adaptation range and applicability of the technology; the limit groove height and the pressure groove height in the above technology are approximately set, that is, the distance between the first pressure rod and the turntable and the distance between the second pressure rod and the turntable are approximately set, ensuring that the side box leaves of the packaging box will not be reset when the packaging box enters the second pressure rod position from the first pressure rod position, so as to improve the closing accuracy of the box leaves of the packaging box; the turntable in the above technology is a component in the assembly line equipment, and it and the drive assembly are both existing technologies, so its structure and function will not be described in detail, and the turntable can be coordinated with the feeding assembly and the discharging assembly in the assembly line equipment.
[0006] The utility model is further configured as follows: the pressing member includes a fixed block and a rocker arm arranged on a frame body, a swing groove is opened on the outer peripheral wall of the fixed block, the rocker arm is movably arranged in the swing groove, a small motor for driving the rocker arm to swing in a fan shape in the swing groove is arranged in the fixed block, and the rocker arm is arranged near the starting end position of the first pressure rod.
[0007] The advantages of adopting the above technical scheme are: the small motor in the above technology drives the swing arm to swing in a fan shape in the swing groove, and the swing arm is arranged near the starting end of the first pressure rod, so that after the side box leaves on one side of the packaging box are pressed down by the first pressure rod, the swing arm swings to make the side box leaves on the other side of the packaging box swing toward the opening of the packaging box receiving groove, so that the side box leaves on both sides of the packaging box can correctly enter the pressure groove and the side box leaves on both sides are in a state of nearly closing the opening of the packaging box receiving groove in the pressure groove, thereby ensuring the normal closure of the side box leaves of the packaging box, thereby improving the sealing efficiency of the packaging box; the small motor in the above technology is the existing technology, and its output end is connected to the end of the swing arm to drive the swing arm to swing in a fan shape along the axis direction of the output end. It is the existing technology, so its structure and function will not be described in detail. At the same time, the small motor can be replaced with a driving device such as a motor or an electric push rod according to actual production needs and design requirements, so as to realize the normal swing of the swing arm.
[0008] The utility model is further provided with: the adjusting member includes a first adjusting rod and a first locking block arranged on the frame body, the first adjusting rod is arranged perpendicular to the end face of the turntable, the starting end of the first adjusting rod is connected to the center of the first pressure rod, the first locking block is provided with a first opening for the end of the first adjusting rod to pass through, the side edge of the first locking block is provided with a first adjusting groove connected to the first opening, the first locking block is threadedly connected to the position of the first adjusting groove corresponding to the first adjusting groove, and is used to reduce the width and diameter of the first adjusting groove so that the inner circumferential wall of the first opening is clamped and matched with the outer circumferential wall of the first adjusting rod.
[0009] The advantage of adopting the above technical scheme is that: when it is necessary to adjust the distance between the first pressure rod and the turntable, the operator can move the first adjusting rod so that the first adjusting rod slides in the first opening along the height direction of the turntable, so that the first adjusting rod drives the first pressure rod to move relative to the turntable, and then adjusts the distance between the first pressure rod and the turntable. After the first adjusting rod moves, the operator screws in the first adjusting bolt, and the first adjusting bolt is matched with a nut, so that the bolt end of the first adjusting bolt and the nut cooperate to clamp the first locking block, that is, the first locking block is locally slightly deformed to reduce the width of the first adjusting groove, and the first adjusting groove and The first opening is connected so that when the width of the first adjustment groove is reduced, the inner walls on both sides of the first adjustment groove gather together, so that the inner peripheral wall of the first opening hugs the outer peripheral wall of the first adjustment rod, thereby fixing the first adjustment rod on the first locking block; the above-mentioned technical setting can realize the adjustment of the distance between the first pressure rod and the turntable, so as to adapt to box leaves of different sizes, thereby realizing the closure of packaging boxes of different sizes and types, thereby improving the closing range and closing efficiency of the box leaves; the first locking block structure in the above-mentioned technology is similar to the hugging lock buckle structure in the prior art, so its principle and structure will not be described in detail.
[0010] The utility model is further configured as follows: the frame is provided with a second adjusting rod and a second locking block, the second adjusting rod is arranged vertically relative to the first adjusting rod, the second locking block is provided with a second opening for the second adjusting rod to pass through, the side of the second locking block is provided with a second adjusting groove connected to the second opening, the second locking block is threadedly connected to the position of the second adjusting groove corresponding to the second adjusting groove, and is used to reduce the width and diameter of the second adjusting groove so that the inner circumferential wall of the second opening is clamped and matched with the outer circumferential wall of the second adjusting rod.
[0011] The advantage of adopting the above technical solution is that: when it is necessary to adjust the relative position of the first pressure rod on the turntable, the operator can move the second adjusting rod so that the second adjusting rod slides horizontally above the turntable in the second opening, so that the second adjusting rod drives the first adjusting rod to move relative to the turntable, that is, the first pressure rod is moved along the diameter direction of the turntable. After the second adjusting rod moves, the operator screws in the second adjusting bolt, and the second adjusting bolt is also equipped with a nut, so that the bolt end of the second adjusting bolt and the nut cooperate to clamp the second locking block, that is, the local slight deformation of the second locking block reduces the width of the first adjusting groove, and the second adjusting groove is connected to the second opening so that the width of the second adjusting groove is When the second adjustment groove is shrunk, the inner walls on both sides of the second adjustment groove gather together, so that the inner wall of the second opening hugs the outer wall of the second adjustment rod, thereby fixing the second adjustment rod on the second locking block; the above-mentioned technical setting realizes the adjustment of the relative position of the first pressure rod on the turntable to adapt to box leaves of different sizes, and at the same time, by adjusting the position of the first pressure rod on the turntable along the diameter direction of the turntable, it is ensured that the first pressure rod can correctly press down the side box leaves, thereby realizing the closure of packaging boxes of different sizes and types, thereby improving the closing range and closing efficiency of the box leaves; the second locking block structure in the above-mentioned technology is similar to the hugging lock structure in the prior art, so its principle and structure will not be described in detail.
[0012] The utility model is further configured as follows: a sliding groove is opened along the length direction of the first locking block; a third adjusting bolt is threadedly connected to the bottom of the second locking block; the third adjusting bolt passes through the sliding groove to the bottom of the first locking block and is threadedly connected to a locking nut; the locking nut is abutted and matched with the bottom of the first locking block.
[0013] The benefits of adopting the above technical solution are: in the above technology, when the relative distance between the first adjusting rod and the second adjusting rod needs to be adjusted, the first locking block can be slid so that the third adjusting bolt can be relatively displaced in the sliding groove, thereby adjusting the relative distance between the first adjusting rod and the second adjusting rod, which in disguise changes the relative position of the first pressure rod on the turntable. After the relative distance between the first adjusting rod and the second adjusting rod is adjusted, the locking nut can be screwed in, and the clamping and limiting of the first locking block is achieved through the cooperation between the nut end of the third adjusting bolt and the locking nut, thereby achieving the relative connection and fixation of the first locking block and the second locking block, thereby improving the connection strength between the first locking block and the second locking block.
[0014] The utility model is further arranged that: the closing member includes a driving seat arranged on one side of the frame, a front plate and a rear plate are movably arranged on the driving seat along the height direction of the turntable, the front plate and the rear plate are arranged in parallel, and a first electric push rod for driving the front plate to reciprocate along the height direction of the turntable and a second electric push rod for driving the rear plate to reciprocate along the height direction of the turntable are arranged on the driving seat, the bottom of the front plate is arranged close to the position of the second pressure rod and the front plate is arranged at the outer side of the limiting groove, the bottom of the front plate is a pushing end for contacting the end face of the top box leaf of the external packaging box, the bottom of the rear plate is a contact end for inserting the external packaging box and contacting the inner wall surface of the external packaging box, and the bottom end face of the rear plate is a pushing surface for contacting the bending portion of the top box leaf of the external packaging box.
[0015] The advantages of adopting the above technical solution are: when the packaging box moves to a position close to the driving seat, the top box leaf of the packaging box is in a semi-closed state, and the front plate is driven by the first electric push rod to press the front plate downward. At this time, the pushing end is pressed downward so that only a small gap is retained between the top box leaf and the opening of the packaging box receiving groove. At this time, the second electric push rod pushes the rear plate so that the contact end of the rear plate is inserted into the packaging box receiving groove and the outer wall surface of the contact end of the rear plate contacts the inner wall surface of the packaging box, thereby realizing the preliminary positioning between the rear plate and the packaging box. In the process of inserting the contact end of the rear plate into the packaging box receiving groove, the pushing surface first contacts the bent portion of the top box leaf and drives the bent portion to bend during the process of pressing the rear plate downward. At this time, the first electric push rod continues to drive The front plate is pressed down so that it presses the top box leaf, so that the top box leaf completely closes the opening of the packaging box container slot, and at the same time, the bent portion is inserted into the gap between the top box leaf and the inner wall of the container slot, so as to achieve complete closure of the packaging box; the above-mentioned technical setting is used to achieve automatic closure of the top box leaf of the packaging box, so as to improve the sealing efficiency and packaging rate of the packaging box, and at the same time, the packaging accuracy is improved through the setting of the above-mentioned technology; in the above-mentioned technology, the first electric push rod and the second electric push rod both play a driving role, and both are existing technologies, so their structure and function will not be described in detail, and at the same time, the manufacturer can replace the electric push rod with a cylinder or other equipment with a driving function according to production needs or equipment installation requirements. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a three-dimensional view of the utility model;
[0017] Figure 2 A three-dimensional view of the first pressure rod and its linkage mechanism and the second pressure rod and its linkage mechanism in the utility model;
[0018] Figure 3 for Figure 2 A plan view of the turntable, wherein the arrow A indicates the end face of the turntable;
[0019] Figure 4 It is a simplified partial view of the front plate and the rear plate;
[0020] Figure 5 It is a simplified cross-sectional view of the low-pressure component in the utility model. DETAILED DESCRIPTION
[0021] The utility model provides an automatic closing device for leaves of a packaging box, comprising a turntable 1 and a driving assembly for driving the turntable 1 to rotate, wherein the turntable 1 is provided with a plurality of placement grooves 11 for placing external packaging boxes in a circumferential direction, a first pressure rod 2 is provided on the turntable 1, a pressure groove 21 is formed between the first pressure rod 2 and the turntable 1 for causing the first pressure rod 2 to press the side leaves of the external packaging box when the turntable 1 rotates, the height of the pressure groove 21 is gradually reduced from the starting end of the first pressure rod 2 to the end of the first pressure rod 2, a second pressure rod 3 is provided on one side of the first pressure rod 2, a limiting groove 31 is formed between the second pressure rod 3 and the turntable 1, a guide portion 32 is bent at the end of the second pressure rod 3 toward the starting end of the first pressure rod 2, and the guide portion 32 is connected to the turntable 1. A guide groove 33 is formed between the first pressure rods 2 for gradually closing the top box leaves of the external packaging box when the turntable 1 rotates and gradually placing them into the limiting groove 31 as the turntable 1 rotates. A frame 4 is provided on one side of the turntable 1. The frame 4 is provided with an adjusting member for adjusting the distance between the first pressure rod 2 and the turntable 1 and a pressing member for temporarily pressing down the side box leaves when the side box leaves of the external packaging box gradually enter the compression groove 21. A closing member for completely closing the top box leaves of the external packaging box is provided on one side of the frame 4. The pressing member includes a fixed block 5 and a rocker rod 51 arranged on the frame 4. A swing groove 53 is opened on the outer peripheral wall of the fixed block 5. The rocker rod 51 is movably arranged in the swing groove 53. A locking member for driving the top box leaves of the external packaging box is provided in the fixed block 5. The movable swing rod 51 is a small motor 52 that swings in a fan shape in the swing groove 53. The swing rod 51 is arranged near the starting end of the first pressure rod 2. The adjusting member includes a first adjusting rod 41 and a first locking block 42 arranged on the frame 4. The first adjusting rod 41 is arranged perpendicular to the end surface of the turntable 1. The starting end of the first adjusting rod 41 is connected to the center of the first pressure rod 2. The first locking block 42 is provided with a first opening 421 for the end of the first adjusting rod 41 to pass through. The first locking block 42 is provided with a first adjusting groove 422 that is connected to the first opening 421 on the side of the first locking block 42. The first locking block 42 is threadedly connected to the position of the first adjusting groove 422 corresponding to the first adjusting groove 422, which is used to reduce the width of the first adjusting groove 422 so that the inner circumferential wall of the first opening 421 is aligned with the first adjusting groove 421. The first adjusting bolt 423 is clamped and matched with the outer peripheral wall of the rod 41, and the frame body 4 is provided with a second adjusting rod 6 and a second locking block 61. The second adjusting rod 6 is arranged vertically relative to the first adjusting rod 41, and a second opening 62 for the second adjusting rod 6 to pass through is opened on the second locking block 61. A second adjusting groove 63 connected with the second opening 62 is opened on the side of the second locking block 61. The second adjusting bolt 64 used for reducing the width and diameter of the second adjusting groove 63 so that the inner peripheral wall of the second opening 62 is clamped and matched with the outer peripheral wall of the second adjusting rod 6 is threadedly connected to the second locking block 61 corresponding to the position of the second adjusting groove 63. The first locking block 42 is provided with a sliding groove 43 along its length direction, and a third adjusting bolt is threadedly connected to the bottom of the second locking block 61.The third adjusting bolt passes through the slide groove 43 to the bottom of the first locking block 42 and is threadedly connected with a locking nut, and the locking nut is abutted and matched with the bottom of the first locking block 42. The closing member includes a driving seat 7 arranged on one side of the frame 4, and a front plate 71 and a rear plate 72 are movably arranged on the driving seat 7 along the height direction of the turntable 1. The front plate 71 and the rear plate 72 are arranged in parallel, and the driving seat 7 is provided with a first electric push rod 711 for driving the front plate 71 to reciprocate along the height direction of the turntable 1 and a first electric push rod 711 for driving the rear plate 72 to reciprocate. 2 A second electric push rod 721 reciprocates along the height direction of the turntable 1. The bottom of the front plate 71 is arranged near the second pressure rod 3 and the front plate 71 is arranged outside the limiting groove 31. The bottom of the front plate 71 is a push end 712 for contacting the end surface of the top box leaf of the external packaging box. The bottom of the rear plate 72 is a contact end 722 for inserting into the external packaging box and contacting the inner wall surface of the external packaging box. The bottom end surface of the rear plate 72 is a push surface 723 for contacting the bent portion of the top box leaf of the external packaging box.
[0022] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which shall fall within the scope of the utility model to be protected. The scope of protection of the utility model shall be defined by the attached claims and their equivalents.
Claims
1. An automatic closing device for packaging box leaves, comprising a turntable and a driving assembly for driving the turntable to rotate, wherein the turntable is provided with a plurality of placement slots for placing external packaging boxes in an annular direction, and characterized in that: The first and second pressure rods are provided on the rotary disk, and a pressure groove is formed between the first pressure rod and the rotary disk, which is used for the first pressure rod to press the side box leaves of the external packaging box when the rotary disk rotates, and the pressure groove height is gradually reduced from the starting end of the first pressure rod to the end of the first pressure rod. A second pressure rod is provided on one side of the first pressure rod, and a limiting groove is formed between the second pressure rod and the rotary disk. A guide portion is bent at the end of the second pressure rod toward the starting end of the first pressure rod, and a guide groove is formed between the guide portion and the first pressure rod, which is used for gradually closing the top box leaves of the external packaging box when the rotary disk rotates and gradually placing them into the limiting groove as the rotary disk rotates. A frame is provided on one side of the rotary disk, and an adjusting member for adjusting the distance between the first pressure rod and the rotary disk and a pressing member for temporarily pressing down the side box leaves when the side box leaves of the external packaging box gradually enter the pressing groove are provided on the frame. A closing member for completely closing the top box leaves of the external packaging box is provided on one side of the frame.
2. The automatic closing device for packaging box leaves according to claim 1, characterized in that: The pressing member includes a fixed block and a rocker arm arranged on a frame, a swing groove is opened on the outer peripheral wall of the fixed block, the rocker arm is movably arranged in the swing groove, a small motor is arranged in the fixed block for driving the rocker arm to swing in a fan shape in the swing groove, and the rocker arm is arranged near the starting end of the first pressure rod.
3. The automatic closing device for packaging box leaves according to claim 1, characterized in that: The adjusting member includes a first adjusting rod and a first locking block arranged on the frame, the first adjusting rod is arranged perpendicular to the end surface of the turntable, the starting end of the first adjusting rod is connected to the center of the first pressure rod, the first locking block is provided with a first opening for the end of the first adjusting rod to pass through, the side of the first locking block is provided with a first adjusting groove connected to the first opening, the first locking block is threadedly connected to the position of the first adjusting groove corresponding to the first adjusting groove, and is used to reduce the width of the first adjusting groove so that the inner circumferential wall of the first opening is clamped and matched with the outer circumferential wall of the first adjusting rod.
4. The automatic closing device for packaging box leaves according to claim 3, characterized in that: The frame body is provided with a second adjusting rod and a second locking block, the second adjusting rod is arranged vertically relative to the first adjusting rod, the second locking block is provided with a second opening for the second adjusting rod to pass through, the side of the second locking block is provided with a second adjusting groove connected to the second opening, the second locking block is threadedly connected to the position of the second adjusting groove corresponding to the second adjusting groove, and the second adjusting bolt is used to reduce the width and diameter of the second adjusting groove so that the inner peripheral wall of the second opening is clamped and matched with the outer peripheral wall of the second adjusting rod.
5. The automatic closing device for packaging box leaves according to claim 4, characterized in that: The first locking block is provided with a sliding groove along its length direction, the bottom of the second locking block is threadedly connected with a third adjusting bolt, the third adjusting bolt passes through the sliding groove to the bottom of the first locking block and is threadedly connected with a locking nut, and the locking nut is abutted and matched with the bottom of the first locking block.
6. The automatic closing device for packaging box leaves according to claim 1, characterized in that: The closing member includes a driving seat arranged on one side of the frame, a front plate and a rear plate are movably arranged on the driving seat along the height direction of the turntable, the front plate and the rear plate are arranged in parallel, and a first electric push rod for driving the front plate to reciprocate along the height direction of the turntable and a second electric push rod for driving the rear plate to reciprocate along the height direction of the turntable are arranged on the driving seat, the bottom of the front plate is arranged close to the position of the second pressure rod and the front plate is arranged at the outer side of the limiting groove, the bottom of the front plate is a pushing end for contacting the end face of the top box leaf of the external packaging box, the bottom of the rear plate is a contact end for inserting the external packaging box and contacting the inner wall surface of the external packaging box, and the bottom end face of the rear plate is a pushing surface for contacting the bending portion of the top box leaf of the external packaging box.