Automatic lid-folding and pre-compression device for packaging boxes

Abstract

This utility model discloses an automatic folding and pre-pressing device for packaging boxes, belonging to the technical field of folding and pre-pressing devices. It includes a roller conveyor with two pairs of first electric telescopic rods fixedly connected to its top, and connecting side plates fixedly connected to the top of each pair of first electric telescopic rods. This utility model uses a folding mechanism to drive the front cover folding pressure plate downwards, which, in conjunction with the rear cover folding pressure plate, folds the front and rear covers of the packaging box. Simultaneously, during the rear cover folding process, the side covers on both sides are driven to move rubber rollers towards the center to fold, thus achieving the side cover folding process. This allows the front and rear covers and side covers to fold synchronously, improving efficiency. By adjusting the pre-pressing mechanism, a third electric telescopic rod is driven to rotate the movable pressure plates on both sides, dynamically adjusting the angle of the movable pressure plates to adapt to the tilted state of the side covers. Then, in conjunction with rubber pressure blocks, the plates are pressed together to ensure uniform pressing.

Description

Technical Field

[0001] This utility model belongs to the technical field of folding and pre-compression devices, and in particular relates to an automatic folding and pre-compression device for packaging boxes. Background Technology

[0002] The automatic lid folding and pre-pressing device for packaging boxes is an automated mechanical device specifically designed for handling the folding and pre-pressing operations of packaging box lids. Through a mechanical structure, pneumatic or electric drive system, it sequentially folds the front, rear, and side lids of the packaging box into place, applying pressure to the folded lids to ensure a stable fit against the box body, thus laying the foundation for subsequent sealing operations.

[0003] Currently, in the automatic folding and pre-pressing process of packaging boxes, the conveyed packaging box first folds the front cover downwards using a swing arm or folding impact block. Then, using a folding arc plate or similar structure, the rear cover is pressed down and adhered to the packaging box. Next, the side cover retracting lever folds the two side covers inwards and presses them together. After folding, a certain pressure is applied to the cover plates using pressure rollers or pressure plates to ensure stable adhesion. However, in actual use, the two side covers are restricted by the folding arc plate of the rear cover during folding, and initially cannot be completely pressed into a horizontal contact state, but are inclined towards each other. The existing technology for pre-pressing folding covers often uses a single large pressure plate to press down on the two inclined cover plates. However, the cover plates on both sides will elastically rebound due to the loss of support force from the folding tool, and the different rebound forces will cause different rebound resets. This results in inconsistent tilt angles between the cover plates on both sides. As a result, when the pressure plate is pressed down, it will preferentially contact one side of the cover plate, resulting in one side being pressed too tightly and the other side being pressed loosely, and the pressing is not uniform. Therefore, this utility model proposes an automatic folding cover pre-pressing device. Utility Model Content

[0004] This utility model provides an automatic folding and pre-pressing device for packaging boxes. The folding mechanism drives the front cover folding plate downwards to strike the front cover, which, in conjunction with the rear cover folding plate, folds the front and rear covers of the packaging box. Simultaneously, during the rear cover folding process, the side covers on both sides are pulled together by rubber rollers, achieving the folding of the side covers. This allows the front and rear covers and side covers to fold synchronously, improving efficiency. By adjusting the pre-pressing mechanism, a third electric telescopic rod is driven to deflect the movable pressure plates on both sides, dynamically adjusting the angle of the movable pressure plates to adapt to the tilted state of the side covers. Then, in conjunction with rubber pressure blocks, the plates are pressed together, ensuring uniform pressing. In summary, this device solves the problems in the prior art.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0006] The automatic folding and pre-compression device for packaging boxes of this utility model includes:

[0007] A roller conveyor, wherein two pairs of first electric telescopic rods are fixedly connected to the top of the roller conveyor, and connecting side plates are fixedly connected to the top of each pair of first electric telescopic rods. A connecting seat is fixedly connected between the opposite sides of the two pairs of connecting side plates, and a rear cover folding pressure plate is fixedly connected to the bottom of the connecting seat. A connecting cross plate is fixedly connected to one side of the connecting seat.

[0008] A folding mechanism is provided on a connecting seat and is used for folding the front cover and side cover of the packaging box.

[0009] An adjustable pre-compression mechanism is provided on one side of the connecting seat and is used for pressing the packaging box cover.

[0010] The pre-pressure adjustment mechanism includes a lifting cylinder fixedly connected to the bottom end of the connecting horizontal plate. A T-shaped plate is fixedly connected to the bottom end of the lifting cylinder, and a rubber pressure block is fixedly connected to the bottom end of the T-shaped plate. A pair of arc-shaped blocks are fixedly connected to both sides of the rubber pressure block, and a movable pressure plate is rotatably connected between the opposite sides of the pair of arc-shaped blocks through bearings and a rotating shaft. A pair of third electric telescopic rods are fixedly connected to the inner top end of the T-shaped plate, and the bottom end of the third electric telescopic rod is rotatably connected to the top end of the movable pressure plate.

[0011] Furthermore, side support plates are fixedly connected to both sides of the roller conveyor, and telescopic cylinders are fixedly connected to the top of the side support plates. A lateral conveyor belt is fixedly connected between the output ends of a pair of telescopic cylinders, and the lateral conveyor belt is located at the top of the roller conveyor.

[0012] Furthermore, the folding mechanism includes a connecting arm, which is fixedly connected to the side of the connecting seat away from the connecting cross plate. A swing plate is rotatably connected between the inner walls of the connecting arm via a bearing and a rotating shaft. A front cover folding pressure plate is fixedly connected to the bottom end of the swing plate. A servo motor is fixedly connected to one side of the connecting arm, and the output end of the servo motor is fixedly connected to a rotating shaft on one side of the swing plate.

[0013] Furthermore, a pair of sliding rods are fixedly connected to both sides of the swing plate, and annular grooves are carved on both sides of the inner wall of the connecting arm. The ends of the pair of sliding rods away from the swing plate are located in the annular grooves and are slidably connected to them.

[0014] Furthermore, the folding mechanism also includes a U-shaped block embedded and connected to the top of the connecting seat. A pair of built-in rods are fixedly connected to the inner wall of the U-shaped block, and a pair of moving blocks are sleeved between the outer walls of the pair of built-in rods. A second electric telescopic rod is embedded and connected to both sides of the U-shaped block, and one end of the second electric telescopic rod is fixedly connected to one side of the moving block. A connecting hanging plate is fixedly connected to the bottom end of the moving block, and a side cover actuating rubber roller is fixedly connected to the bottom end of the connecting hanging plate.

[0015] Furthermore, each of the three electric telescopic rods has a movable block fixedly connected to its bottom end, and each of the movable pressure plates has a pair of connecting plates fixedly connected to its top end. The two sides of the movable blocks are rotatably connected to the pair of connecting plates via a rotating shaft and a bearing, respectively.

[0016] Furthermore, a rubber pad is fixedly connected to the bottom end of each of the pair of movable pressure plates, and the bottom end of the rubber pad is flush with the bottom end of the rubber pressure block in the horizontal state.

[0017] The present invention has the following advantages over the prior art:

[0018] 1. This technical solution, through its folding mechanism, can drive a servo motor to swing a plate and cause the front cover folding plate to strike the front cover downwards. This, together with the rear cover folding plate, can fold the front and rear covers of the packaging box. Simultaneously, during the rear cover folding process, a pair of second electric telescopic rods are driven to move the side cover rubber rollers on both sides towards the center to fold the side cover, thus achieving the folding of the side cover. This allows the front and rear covers and the side covers to be folded synchronously, improving efficiency.

[0019] 2. This technical solution uses a pre-pressurization mechanism to drive a third electric telescopic rod to rotate the movable pressure plates on both sides. This allows for dynamic adjustment of the movable pressure plate angle to adapt to the tilted state of the side cover. Then, the lifting cylinder drives the rubber block and a pair of movable pressure plates to press together via a T-shaped plate, ensuring uniform pressing.

[0020] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a three-dimensional structural diagram of the automatic folding and pre-compression device for packaging boxes according to this utility model.

[0023] Figure 2 This is a partial cross-section and disassembly diagram of the folding mechanism in this utility model from another perspective;

[0024] Figure 3 This utility model Figure 2 Enlarged structural diagram at point A;

[0025] Figure 4 This is a partial cross-sectional view of the folding mechanism in this utility model;

[0026] Figure 5 This is a partial disassembled structural diagram of the connecting horizontal plate and the adjusting preload mechanism in this utility model.

[0027] The attached diagram lists the components represented by each number as follows:

[0028] 1. Roller conveyor; 2. Side support plate; 3. Telescopic cylinder; 4. Side conveyor belt; 5. First electric telescopic rod; 6. Connecting side plate; 7. Connecting seat; 8. Rear cover folding plate; 9. Folding mechanism; 901. Connecting arm; 902. Swing plate; 903. Front cover folding plate; 904. Servo motor; 905. Sliding rod; 906. Annular chute; 907. Recurved block; 908. Second electric telescopic rod; 9 9. Moving block; 9010. Built-in rod; 9011. Connecting hanging plate; 9012. Side cover actuating rubber roller; 10. Connecting horizontal plate; 11. Adjusting preload mechanism; 1101. Lifting cylinder; 1102. T-shaped plate; 1103. Rubber pressure block; 1104. Arc-shaped block; 1105. Movable pressure plate; 1106. Connecting piece; 1107. Moving block; 1108. Third electric telescopic rod; 12. Rubber pad. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0030] In the description of this utility model, it should be understood that the terms "relative", "one end", "inner", "lateral", "end", "both ends", "both sides", "front", "one end face", "the other end face", etc., which indicate orientation or positional relationship, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Specific Implementation Example 1:

[0032] Please see Figures 1-5 As shown, the automatic folding and pre-compression device for packaging boxes of this utility model includes:

[0033] Roller conveyor 1, with two pairs of first electric telescopic rods 5 fixedly connected to the top of roller conveyor 1, and connecting side plates 6 fixedly connected to the top of each pair of first electric telescopic rods 5, connecting seats 7 fixedly connected between the opposite sides of the two pairs of connecting side plates 6, and a rear cover folding pressure plate 8 fixedly connected to the bottom of the connecting seat 7, and a connecting horizontal plate 10 fixedly connected to one side of the connecting seat 7.

[0034] Folding mechanism 9 is provided on connecting seat 7 and is used for folding the front cover and side cover of the packaging box;

[0035] Adjustable pre-compression mechanism 11 is located on one side of connecting seat 7 and is used for pressing the packaging box cover.

[0036] The pre-compression adjustment mechanism 11 includes a lifting cylinder 1101 fixedly connected to the bottom end of the connecting horizontal plate 10. A T-shaped plate 1102 is fixedly connected to the bottom end of the lifting cylinder 1101, and a rubber pressure block 1103 is fixedly connected to the bottom end of the T-shaped plate 1102. A pair of arc-shaped blocks 1104 are fixedly connected to both sides of the rubber pressure block 1103, and a movable pressure plate 1105 is rotatably connected between the opposite sides of the pair of arc-shaped blocks 1104 through bearings and a rotating shaft. A pair of third electric telescopic rods 1108 are fixedly connected to the inner top end of the T-shaped plate 1102, and the bottom end of the third electric telescopic rod 1108 is rotatably connected to the top end of the movable pressure plate 1105.

[0037] In the specific implementation process, the packaging box is placed on the roller conveyor 1 for conveying. The two pairs of first electric telescopic rods 5 drive the connecting seat 7 to move downward through the connecting side plate 6, so as to adjust the height of the rear cover folding pressure plate 8 and the folding mechanism 9 according to the height of the packaging box, so as to facilitate the folding process. After the folding mechanism 9 cooperates with the rear cover folding pressure plate 8 to fold the front and rear covers and side covers of the packaging box, it is conveyed to the pre-pressing area. At this time, the side covers on both sides are not completely in horizontal contact during the folding process due to the restriction of the rear cover folding pressure plate 8, and are in an inclined state. The driving lifting cylinder 1101 drives the rubber pressure block 11 through the T-shaped plate 1102. 03 and a pair of movable pressure plates 1105 move downwards. At the same time, a pair of third electric telescopic rods 1108 squeeze the movable pressure plates 1105 to deflect along the rubber pressure block 1103, adjusting the angle of the movable pressure plates 1105 so that the tilt angle of the movable pressure plates 1105 is consistent with the tilt angle of the side covers. Then, driven by the lifting cylinder 1101, the rubber pressure block 1103 and a pair of movable pressure plates 1105 press the pair of side covers together, causing the pair of side covers to move slowly downwards. At the same time, the pair of third electric telescopic rods 1108 drive the movable pressure plates 1105 to gradually return to the horizontal state, so as to drive the pair of side covers to be evenly pressed into a horizontal contact state.

[0038] The roller conveyor 1 has side support plates 2 fixedly connected to both sides, and telescopic cylinders 3 fixedly connected to the top of the side support plates 2. A side conveyor belt 4 is fixedly connected between the output ends of a pair of telescopic cylinders 3, and the side conveyor belt 4 is located at the top of the roller conveyor 1.

[0039] A pair of telescopic cylinders 3 push a pair of side conveyor belts 4 to move in opposite directions, contacting the sides of the packaging box to ensure that it is transported in the center of the roller conveyor 1 and is not prone to deviation.

[0040] Among them, the bottom ends of a pair of third electric telescopic rods 1108 are fixedly connected to movable blocks 1107, and the top ends of a pair of movable pressure plates 1105 are fixedly connected to a pair of connecting pieces 1106. The two sides of the movable blocks 1107 are rotatably connected to the pair of connecting pieces 1106 through a rotating shaft and a bearing, respectively.

[0041] The third electric telescopic rod 1108 drives the rotatably connected movable block 1107 to move downward, transmitting the telescopic motion of the third electric telescopic rod 1108 to the movable pressure plate 1105, causing it to deflect with the assistance of the rotating shaft and bearings. This converts the linear motion of the third electric telescopic rod 1108 into the rotational motion of the movable pressure plate 1105, enabling independent angle adjustment of the movable pressure plates 1105 on both sides.

[0042] Among them, the bottom ends of a pair of movable pressure plates 1105 are fixedly connected with rubber pads 12, and the bottom ends of the rubber pads 12 are flush with the bottom ends of the rubber pressure blocks 1103 in the horizontal state.

[0043] By using the rubber pad 12 in conjunction with the rubber pressure block 1103, the cover of the packaging box can be flexibly pressed together, avoiding the cardboard indentations caused by traditional metal pressure plates. Specific Implementation Example 2:

[0045] Please see Figures 1-4 As shown, in a preferred embodiment, the folding mechanism 9 includes a connecting arm 901, which is fixedly connected to the side of the connecting seat 7 away from the connecting cross plate 10. A swing plate 902 is rotatably connected between the inner walls of the connecting arm 901 via a bearing and a rotating shaft. A front cover folding pressure plate 903 is fixedly connected to the bottom end of the swing plate 902. A servo motor 904 is fixedly connected to one side of the connecting arm 901, and the output end of the servo motor 904 is fixedly connected to a rotating shaft on one side of the swing plate 902.

[0046] In the specific implementation process, when the packaging box enters the folding area through the roller conveyor 1, the drive servo motor 904 drives the swing plate 902 to swing downward, which in turn drives the front cover folding pressure plate 903 to swing downward, striking the front cover to fold downward. At the same time, the rear cover is folded simultaneously by the rear cover folding pressure plate 8, thereby realizing the folding process of the front and rear covers.

[0047] The swing plate 902 has a pair of sliding rods 905 fixedly connected to both sides. The inner walls of the connecting arm 901 are both carved with annular grooves 906, and the ends of the pair of sliding rods 905 away from the swing plate 902 are located in the annular grooves 906 and are slidably connected to them.

[0048] When the swing plate 902 swings under the drive of the servo motor 904, it drives a pair of sliding rods 905 to slide along the annular groove 906, thereby assisting the swing of the swing plate 902 and keeping it in stable motion.

[0049] The folding mechanism 9 also includes a loop block 907 embedded and connected to the top of the connecting seat 7. A pair of built-in rods 9010 are fixedly connected to the inner wall of the loop block 907, and a pair of moving blocks 909 are sleeved between the outer walls of the pair of built-in rods 9010. A second electric telescopic rod 908 is embedded and connected to both sides of the loop block 907, and one end of the second electric telescopic rod 908 is fixedly connected to one side of the moving block 909. A connecting hanging plate 9011 is fixedly connected to the bottom end of the moving block 909, and a side cover actuating rubber roller 9012 is fixedly connected to the bottom end of the connecting hanging plate 9011.

[0050] During the back cover compression and folding process, a pair of second electric telescopic rods 908 are driven to push a pair of moving blocks 909 to move towards each other along a pair of built-in rods 9010. This causes the connecting hanging plate 9011 to drive a pair of side cover actuating rubber rollers 9012 to move towards each other, thus retracting the side cover towards the center and realizing the folding process of the side cover. This allows the front and rear covers and the side cover to be folded simultaneously, improving efficiency.

[0051] The circuits, electronic components, and chip modules involved in this utility model are all existing technologies, which can be fully implemented by those skilled in the art, and need not be elaborated upon. The content protected by this utility model does not involve any improvement to the software and methods.

[0052] All standard parts used in the application documents can be purchased from the market. All components in this application document can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. The electrical components mentioned in this document are all electrically connected to the external main controller and power supply, and the main controller is a conventional known device that can play a control role.

[0053] The working principle of this utility model is as follows:

[0054] In use, the packaging box is placed on the roller conveyor 1 for transport. Simultaneously, two pairs of first electric telescopic rods 5 are driven to move the connecting seat 7 downwards via the connecting side plate 6. The height of the rear cover folding pressure plate 8 is adjusted according to the height of the packaging box. Then, when the packaging box enters the folding area via the roller conveyor 1, the servo motor 904 drives the swing plate 902 to swing downwards, causing the front cover folding pressure plate 903 to swing downwards, causing the front cover to fold downwards. Simultaneously, the rear cover is folded by the rear cover folding pressure plate 8. During the rear cover folding process, a pair of second electric telescopic rods 908 are driven to push a pair of moving blocks 909 along a pair of built-in rods 9010 to move towards each other. This causes the connecting hanging plate 9011 to drive a pair of side cover actuating rubber rollers 9012 to move towards each other, retracting the side covers towards the center, thus achieving the folding of the side covers. This simultaneously completes the folding of the front and rear covers and the side covers, and then the box is transported to the pre-fabrication area. In the pressing area, the side covers on both sides are not in a completely horizontal contact state during the folding process due to the restriction of the rear cover folding pressure plate 8, and are in an inclined state. The driving lifting cylinder 1101 drives the rubber pressure block 1103 and a pair of movable pressure plates 1105 to move downward through the T-shaped plate 1102. At the same time, a pair of third electric telescopic rods 1108 squeeze the movable pressure plate 1105 along the rubber pressure block 1103 through the movable block 1107 to adjust the angle of the movable pressure plate 1105 so that the tilt angle of the movable pressure plate 1105 is consistent with the tilt angle of the side cover. Then, driven by the lifting cylinder 1101, the rubber pressure block 1103 and a pair of movable pressure plates 1105 press the pair of side covers together, causing the pair of side covers to move slowly downward. At the same time, the driving third electric telescopic rods 1108 drive the movable pressure plate 1105 to gradually return to a horizontal state, thereby driving the pair of side covers to be evenly pressed together to a horizontal contact state.

[0055] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. An automatic lid-folding and pre-compression device for packaging boxes, characterized in that, include: Roller conveyor (1), the top of the roller conveyor (1) is fixedly connected to two pairs of first electric telescopic rods (5), and the top of each pair of first electric telescopic rods (5) is fixedly connected to a connecting side plate (6). A connecting seat (7) is fixedly connected between the opposite sides of the two pairs of connecting side plates (6), and a rear cover folding plate (8) is fixedly connected to the bottom of the connecting seat (7). A connecting cross plate (10) is fixedly connected to one side of the connecting seat (7). Folding mechanism (9), which is disposed on connecting seat (7) and is used for folding the front cover and side cover of the packaging box; Adjustable pre-compression mechanism (11), which is located on one side of the connecting seat (7) and is used for pressing the packaging box cover; The pre-pressure adjustment mechanism (11) includes a lifting cylinder (1101) fixedly connected to the bottom end of the connecting horizontal plate (10). A T-shaped plate (1102) is fixedly connected to the bottom end of the lifting cylinder (1101), and a rubber pressure block (1103) is fixedly connected to the bottom end of the T-shaped plate (1102). A pair of arc-shaped blocks (1104) are fixedly connected to both sides of the rubber pressure block (1103), and a movable pressure plate (1105) is rotatably connected between the opposite sides of the pair of arc-shaped blocks (1104) through bearings and a rotating shaft. A pair of third electric telescopic rods (1108) are fixedly connected to the inner top end of the T-shaped plate (1102), and the bottom end of the third electric telescopic rod (1108) is rotatably connected to the top end of the movable pressure plate (1105).

2. The automatic lid-folding and pre-compression device for packaging boxes according to claim 1, characterized in that, Both sides of the roller conveyor (1) are fixedly connected to side support plates (2), and the top of the side support plates (2) is fixedly connected to telescopic cylinders (3). A side conveyor belt (4) is fixedly connected between the output ends of a pair of telescopic cylinders (3), and the side conveyor belt (4) is located at the top of the roller conveyor (1).

3. The automatic lid-folding and pre-compression device for packaging boxes according to claim 1, characterized in that, The folding mechanism (9) includes a connecting arm (901), which is fixedly connected to the side of the connecting seat (7) away from the connecting cross plate (10). A swing plate (902) is rotatably connected between the inner walls of the connecting arm (901) and the swing plate (902) through a bearing and a rotating shaft. A front cover folding pressure plate (903) is fixedly connected to the bottom end of the swing plate (902). A servo motor (904) is fixedly connected to one side of the connecting arm (901), and the output end of the servo motor (904) is fixedly connected to a rotating shaft on one side of the swing plate (902).

4. The automatic lid-folding and pre-compression device for packaging boxes according to claim 3, characterized in that, A pair of sliding rods (905) are fixedly connected to both sides of the swing plate (902). Annular grooves (906) are carved on both sides of the inner wall of the connecting arm (901). The ends of the pair of sliding rods (905) away from the swing plate (902) are located in the annular grooves (906) and are slidably connected to them.

5. The automatic lid-folding and pre-compression device for packaging boxes according to claim 1, characterized in that, The folding mechanism (9) further includes a loop block (907) embedded and connected to the top of the connecting seat (7). A pair of built-in rods (9010) are fixedly connected to the inner wall of the loop block (907), and a pair of moving blocks (909) are sleeved between the outer walls of the pair of built-in rods (9010). A second electric telescopic rod (908) is embedded and connected to both sides of the loop block (907), and one end of the second electric telescopic rod (908) is fixedly connected to one side of the moving block (909). A connecting hanging plate (9011) is fixedly connected to the bottom end of the moving block (909), and a side cover actuating rubber roller (9012) is fixedly connected to the bottom end of the connecting hanging plate (9011).

6. The automatic lid-folding and pre-compression device for packaging boxes according to claim 1, characterized in that, The bottom ends of each pair of the third electric telescopic rods (1108) are fixedly connected to a movable block (1107), and the top ends of each pair of movable pressure plates (1105) are fixedly connected to a pair of connecting pieces (1106). The two sides of the movable block (1107) are rotatably connected to the pair of connecting pieces (1106) through a rotating shaft and a bearing, respectively.

7. The automatic lid-folding and pre-compression device for packaging boxes according to claim 1, characterized in that, A rubber pad (12) is fixedly connected to the bottom end of each of the pair of movable pressure plates (1105), and the bottom end of the rubber pad (12) is flush with the bottom end of the rubber pressure block (1103) in the horizontal state.

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