Automatic closing device for packaging box

Abstract

The present invention discloses an automatic packaging box lid closing device, comprising a frame, a conveying mechanism arranged on the frame, a folding tongue cover mechanism, a cover pushing mechanism and a front cover pushing mechanism which are arranged on one side of the conveying mechanism and are arranged in sequence from the front end of the conveying direction of the conveying mechanism to the rear; the ear folding action is achieved by the folding tongue cover mechanism, the cover pushing mechanism can achieve the action of pressing down the upper cover, and the front cover pushing mechanism can achieve the action of pressing down the front cover; the various mechanisms are seamlessly connected by the conveying mechanism to achieve continuous actions between the various mechanisms; the automatic packaging box lid closing device of the present invention can automatically close the packaging box after the product is loaded, which can replace manual operation, can save labor costs, improve the degree of automation, and greatly improve production efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of automation equipment, in particular to an automatic lid closing device for a packaging box. Background Art

[0002] In the field of manufacturing, as the labor cost of enterprises increases year by year, it is the part that has the greatest impact on product costs; for the packaging of many products, the domestic and foreign packaging models are mainly based on traditional manual operations. The traditional packaging operation model cannot meet the huge market demand, and the production cost is high and the production efficiency is low.

[0003] Packaging boxes are widely used to package various products. A common packaging box is designed with an opening on the top surface. The product is transferred into the packaging box through the top opening. After the product is loaded, the packaging box needs to be closed. If the lid is closed manually, the closing efficiency is slow, the labor cost is high, and the packaging box is easy to be dirty. Therefore, it is necessary to design a device that can realize automatic lid closing to replace manual work. Summary of the invention

[0004] The object of the present invention is to provide an automatic packaging box lid closing device which can save labor costs and improve the degree of automation, so as to improve production efficiency.

[0005] In order to achieve the above object, the solution of the present invention is:

[0006] A packaging box automatic closing device comprises: a frame, a conveying mechanism arranged on the frame, a folding tongue cover mechanism, a cover pushing mechanism and a front cover pushing mechanism arranged on one side of the conveying mechanism and arranged in sequence from the front end of the conveying direction of the conveying mechanism to the rear; the folding tongue cover mechanism comprises a tongue cover support seat, a folding tongue cover swing rod and a folding tongue cover swing arm, the tongue cover support seat is fixedly arranged on the frame, the folding tongue cover swing rod is arranged on the tongue cover support seat and connected to the transmission shaft of the conveying mechanism, and the folding tongue cover swing arm is correspondingly arranged above the chain of the conveying mechanism; the cover pushing mechanism comprises a base, a turntable, a cover pushing swing arm and an upper cover push plate, the base is arranged on the frame, the turntable is arranged on the base and connected to the transmission shaft of the conveying mechanism, one end of the cover pushing swing arm is arranged on the turntable, and the other end of the cover pushing swing arm is connected to the upper cover push plate; the front cover pushing mechanism comprises a mounting seat, a transmission mechanism and a front cover push plate, the mounting seat is arranged on the frame, the transmission mechanism is arranged on the mounting seat, and the front cover push plate is connected to the transmission mechanism.

[0007] Furthermore, the transmission shaft of the conveying mechanism includes a driving shaft, a driven shaft and multiple sets of transmission gears connected to the driving mechanism, the transmission gears include a first transmission gear and a second transmission gear, the driving mechanism is arranged on the frame and its output shaft is arranged perpendicular to the conveying chain, the output shaft of the driving mechanism is connected to the driving shaft, and the position of the driving shaft corresponding to the conveying chain is sleeved with a first transmission gear engaged with the conveying chain, the driven shaft is arranged at the end of the driving shaft and arranged along the length direction of the conveying chain, the driven shaft and the driving shaft are connected through the second transmission gear, the second transmission gear is a bevel gear, and the driven shaft is connected to the upper cover mechanism and the front cover mechanism through the bevel gear.

[0008] Furthermore, an upper cover guiding mechanism is also arranged between the upper cover pushing mechanism and the front cover pushing mechanism. The upper cover guiding mechanism is arranged on the side of the conveying mechanism on the same side of the upper cover pushing mechanism. The upper cover guiding mechanism includes an upper cover guide rod and an upper cover pressing plate. The upper cover guide rod is arranged on the upper cover pressing plate. One end of the upper cover pressing plate is fixed on the frame, and the other end faces the conveying mechanism. The upper cover guide rod is inclined upward from the upper cover pressing plate toward the direction close to the upper cover pushing mechanism.

[0009] Furthermore, a front cover guiding mechanism is also arranged between the upper cover pushing mechanism and the front cover pushing mechanism. The front cover guiding mechanism is arranged on the side of the conveying mechanism opposite to the upper cover pushing mechanism. The front cover guiding mechanism includes a supporting base and a front cover guide plate. The supporting base is fixed on the frame. One end of the front cover guide plate is fixed on the front cover guide plate, and the other end is arranged obliquely above the conveying chain of the conveying mechanism.

[0010] Furthermore, the folding tongue cover mechanism also includes: a folding tongue cover connecting rod, a connecting rod block, a connecting rod guide block, a folding tongue cover transmission rod and a transmission connecting rod. The middle part of the folding tongue cover connecting rod is pivotally connected to the tongue cover support seat, and a long groove is respectively provided at both ends of the folding tongue cover connecting rod. One end of the connecting rod block is sleeved on the folding tongue cover rocker rod, and the other end of the connecting rod block is arranged in the long groove at one end of the folding tongue cover connecting rod. One end of the folding tongue cover transmission rod is arranged in the other long groove of the folding tongue cover connecting rod. The other end of the folding tongue cover transmission rod is connected to one end of the transmission connecting rod, and the other end of the transmission connecting rod is connected to the cover pushing mechanism. The connecting rod guide block is fixed on the tongue cover support seat, and the connecting rod guide block is provided with a guide hole for the folding tongue cover transmission rod to pass through.

[0011] Furthermore, the cover pushing mechanism is provided with two turntables and two swing arms, and the two turntables are fixed on the two gear plates respectively. The bottom of the rotating shaft of the two gear plates is connected to the transmission connecting rod of the folding tongue cover mechanism. One end of the two swing arms is fixed to the top of the rotating shaft of the two gear plates, and the other end of the swing arms is fixed to the cover pushing plate. The gear plate is meshed with the driving gear, and the rotating shaft of the driving gear is connected to the driven shaft of the conveying mechanism through the umbrella gear.

[0012] Furthermore, the transmission mechanism of the front cover pushing mechanism includes a transmission gear, a transmission shaft and a front cover pushing swing arm. The transmission shaft is connected to the driven shaft of the conveying mechanism through a bevel gear. The transmission gear is connected to the transmission shaft. One end of the front cover pushing swing arm is fixedly matched with the shaft of the transmission gear. The other end of the front cover pushing swing arm is connected to the front cover push plate. The front end of the front cover push plate forms an arc-shaped transition folded edge.

[0013] After adopting the above scheme, the automatic closing device for the packaging box of the present invention decomposes the action when closing the packaging box, first folding the ears, then pressing down the upper cover of the packaging box, and finally inserting the front cover into the packaging box, and then setting corresponding action mechanisms for corresponding actions, and realizing the action of folding the ears through the folding tongue cover mechanism, the action of pressing down the upper cover through the pushing cover mechanism, and the action of pressing down the front cover through the pushing front cover mechanism. The various mechanisms are seamlessly connected through the conveying mechanism to realize the coherent actions between the various mechanisms. Through the automatic closing device for the packaging box of the present invention, the packaging box after the product is loaded can be automatically closed, which can replace manual operation, not only can save labor costs and improve the degree of automation, but also can greatly improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The three-dimensional Figure 1 .

[0015] Figure 2 The three-dimensional Figure 2 .

[0016] Figure 3 It is a front view of the present invention.

[0017] Figure 4 It is a top view of the present invention.

[0018] Figure 5 It is a three-dimensional diagram of the conveying mechanism of the present invention.

[0019] Figure 6 It is a three-dimensional diagram of the folding tongue cover mechanism of the present invention.

[0020] Figure 7 It is a three-dimensional diagram of the cover pushing mechanism of the present invention.

[0021] Figure 8 It is a three-dimensional diagram of the upper cover guiding mechanism of the present invention.

[0022] Fig. 9 It is a three-dimensional diagram of the front cover guide mechanism of the present invention.

[0023] Fig.10 It is a three-dimensional diagram of the front cover pushing mechanism of the present invention. DETAILED DESCRIPTION

[0024] In order to further explain the technical solution of the present invention, the present invention is described in detail below through specific embodiments.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0026] like Figures 1 to 10 The figure shows a specific embodiment of an automatic lid closing device for a packaging box of the present invention, which comprises: a frame 1, a conveying mechanism 2, a tongue-folding cover mechanism 3, a lid-pushing mechanism 4 and a lid-pushing mechanism 5 which are arranged on the frame 1 at the side of the conveying mechanism 2 and arranged in sequence from the front end of the conveying direction of the conveying mechanism 2 to the rear.

[0027] The conveying mechanism 2 is arranged on the frame 1, and includes a driving mechanism 21, a transmission shaft 22 and a transmission chain 23. The transmission shaft 23 is connected to the driving mechanism 21, and the transmission chain 23 is connected to the transmission shaft 22. The driving mechanism 21 can be a reduction motor, and the transmission shaft 22 includes a driving shaft 221 connected to the reduction motor, a driven shaft 222 and a plurality of transmission gears 223, and the transmission chain 23 is connected to the transmission gear 223 of the transmission shaft 22. Figure 1 As shown, in this embodiment, the transmission gear 223 includes a first transmission gear 223A and a second transmission gear 223B. The driving mechanism 21 (reduction motor) is arranged on the frame 1 and its output shaft is arranged perpendicular to the conveying chain 23. The output shaft of the driving mechanism 21 is connected to the driving shaft 221. The driving shaft 221 is sleeved with a first transmission gear 223A meshing with the conveying chain 23 at a position corresponding to the conveying chain 23. When the reduction motor drives the driving shaft 221 to rotate, the transmission gear 223 can drive the conveying chain 23 to transmit. The driven shaft 222 is arranged at the end of the driving shaft 221 and is arranged along the length direction of the conveying chain 23. The driven shaft 222 is connected to the driving shaft 221 through the second transmission gear 223B, and the second transmission gear 223B can be a bevel gear.

[0028] like Figure 6As shown, the folding tongue cover mechanism 3 includes a tongue cover support seat 31, a folding tongue cover rocker rod 32 and a folding tongue cover swing arm 33. The tongue cover support seat 31 is fixedly arranged on the frame 1, the folding tongue cover rocker rod 32 is arranged on the tongue cover support seat 31 and connected to the transmission shaft 22 of the conveying mechanism 2, and the folding tongue cover swing arm 33 is connected to one end of the folding tongue cover rocker rod 32 and corresponds to the top of the conveying chain 23 of the conveying mechanism 2. In this embodiment, the folding tongue cover mechanism 3 adopts a reciprocating swinging mode, and the folding tongue cover mechanism 3 also includes: a folding tongue cover connecting rod 34, a connecting rod block 35, a connecting rod guide block 36, a folding tongue cover transmission rod 37 and a transmission connecting rod 38. The middle part of the folding tongue cover connecting rod 34 is pivotally connected to the tongue cover support seat 31, and a long groove 39 is respectively provided at both ends of the folding tongue cover connecting rod 34. One end of the connecting rod block 35 is sleeved on the folding tongue cover swing rod 32, and the other end of the connecting rod block 35 is arranged in the long groove 39 at one end of the folding tongue cover connecting rod 34. One end of the folding tongue cover transmission rod 37 is arranged in the other long groove 39 of the folding tongue cover connecting rod 34. The other end of the folding tongue cover transmission rod 37 is connected to one end of the transmission connecting rod 38, and the other end of the transmission connecting rod 38 is connected to the gear shaft of the cover pushing mechanism 4. The connecting rod guide block 36 is fixed on the tongue cover support seat 31, and the connecting rod guide block 36 is provided with a guide hole for the folding tongue cover transmission rod 37 to pass through.

[0029] When the gear shaft of the cover pushing mechanism 4 rotates, it will drive the transmission connecting rod 38 to move forward and backward, and the transmission connecting rod 38 will drive the folding tongue cover transmission rod 37 to move synchronously. The folding tongue cover transmission rod 37 will move forward and backward along the long groove 39 of the folding tongue cover connecting rod 34, and at the same time drive the folding tongue cover connecting rod 34 to swing with the pivot point pivoted to the tongue cover support seat as the intersection, and drive the connecting rod block 35 to move forward and backward in the other long groove of the folding tongue cover connecting rod 34, so that the folding tongue cover swing rod 32 connected to the connecting rod block 35 will follow the clockwise or counterclockwise rotation, and then drive the folding tongue cover swing arm 33 fixed at one end of the folding tongue cover swing rod 32 to swing back and forth. When the front ear piece of the packaging box is conveyed to the folding tongue cover mechanism 3, the folding tongue cover swing arm 33 is just facing the front ear side of the packaging box, and the front ear is stopped by the folding tongue cover swing arm 33 and folded into the packaging box. The folding tongue cover swing arm 33 swings back and forth. After the folding tongue cover swing arm 33 swings back and forth once, its swing arm can swing the back ear into the packaging box from the back of the packaging box, completing the folding tongue cover action.

[0030] like Figure 7As shown, the cover pushing mechanism 4 includes a base 41, a turntable 42, a cover pushing swing arm 43 and a cover pushing plate 44. The base 41 is arranged on the frame 1, the turntable 42 is arranged on the base 41 and connected to the transmission shaft 22 of the conveying mechanism 2, one end of the cover pushing swing arm 43 is arranged on the turntable 42, and the other end of the cover pushing swing arm 43 is connected to the cover pushing plate 44. In this embodiment, there are two turntables 42 and two cover pushing swing arms 43, respectively, and the two turntables 42 are fixedly arranged on two gear plates 45, respectively, and the bottom of the rotating shaft of the two gear plates 45 is connected to the transmission connecting rod 38 of the folding tongue cover mechanism 3, and the two cover pushing swing arms 43 are fixed on the top of the rotating shaft of the two gear plates 45, and the gear plates 45 are meshed with the driving gear, and the rotating shaft of the driving gear is connected to the driven shaft 222 of the conveying mechanism 2 through the bevel gear. When the driven shaft 222 of the conveying mechanism 2 is running, it will drive the driving gear to rotate, and the driving gear will drive the two gear plates 45 meshing with it to rotate in the same direction, driving the cover pushing swing arm 43 located on the rotating shaft of the two gear plates 45 to rotate, and the cover pushing swing arm 43 drives the cover pushing plate 44 to draw a circle. When the packaging box is transmitted from the folding tongue cover mechanism 3 to the cover pushing mechanism 4, the cover pushing swing arm 43 rotates counterclockwise or clockwise to make the cover pushing plate 44 press the cover of the packaging box from back to front toward the opening direction, completing the cover pressing action.

[0031] After the cover pressing action is completed, in order to keep the upper cover of the packaging box in a pressed state and transition to the front cover pushing mechanism 5, an upper cover guiding mechanism 6 and a front cover guiding mechanism 7 are also arranged between the upper cover pushing mechanism 4 and the front cover pushing mechanism 5. The upper cover guiding mechanism 6 is arranged on the side of the conveying mechanism on the same side of the upper cover pushing mechanism 4, and the front cover guiding mechanism 7 is arranged on the side of the conveying mechanism 2 on the opposite side of the upper cover pushing mechanism 4.

[0032] like Figure 8 As shown, the upper cover guiding mechanism 6 includes an upper cover guiding rod 61 and an upper cover pressing plate 62. The upper cover guiding rod 61 is arranged on the upper cover pressing plate 62. One end of the upper cover pressing plate 62 is fixed on the frame 1, and the other end faces the conveying mechanism 2. The upper cover guiding rod 61 is inclined upward from the upper cover pressing plate 62 toward the direction close to the upper cover pushing mechanism 4. When the packaging box is transferred from the upper cover pushing mechanism 4 to the upper cover guiding mechanism 6, the upper cover is pressed down by the upper cover pushing plate 44 and then enters the lower part of the upper cover pressing plate 62 along the upper cover guiding rod 61.

[0033] like Fig. 9 As shown, the front cover guide mechanism 7 includes a support base 71 and a front cover guide plate 72, the support base 71 is fixed on the frame 1, one end of the front cover guide plate 72 is fixed on the front cover guide plate 72, and the other end is obliquely arranged above the conveying chain 23 of the conveying mechanism 2. When the packaging box is transferred from the cover pushing mechanism 4 to the front cover guide mechanism 7, the front end of the upper cover of the packaging box (i.e., the front cover) will be tilted along the direction of the obliquely arranged front cover guide plate 72, which is convenient for the subsequent pressing of the front cover.

[0034] like Fig.10As shown, the front cover pushing mechanism 5 includes a mounting seat 51, a transmission mechanism 52 and a front cover push plate 53. The mounting seat 51 is longitudinally arranged on the frame 1, the transmission mechanism 52 is arranged on the mounting seat 51, and the front cover push plate 53 is connected to the transmission mechanism 52; the transmission mechanism 52 includes a transmission gear 54, a transmission shaft 55 and a front cover pushing swing arm 56, the transmission shaft 55 is connected to the driven shaft 222 of the conveying mechanism 2 through a bevel gear, the transmission gear 54 is connected to the transmission shaft 55, one end of the front cover pushing swing arm 56 is fixedly matched with the shaft of the transmission gear 54, and the other end of the front cover pushing swing arm 56 is connected to the front cover push plate 53, and the front end of the front cover push plate 53 forms an arc-shaped transition folded edge 57. When the driven shaft 222 of the conveying mechanism 2 rotates, the transmission shaft 55 of the transmission mechanism 52 is driven to rotate, and then the transmission gear 54 is driven to rotate. The shaft of the transmission gear 54 drives the front cover push swing arm 56 to rotate clockwise or counterclockwise, thereby driving the front cover push plate 53 to perform a vertical circular motion. When the packaging box is conveyed to the front cover push mechanism 5, the folding edge 57 of the front cover push plate 53 moves from top to bottom to press down the front cover of the packaging box. In particular, after the packaging box passes through the front cover guide mechanism 7, the front cover will tilt upward, and the folding edge 57 will press the front cover downward accordingly to ensure that the front cover is pressed down in place, completing the front cover pressing action. At this point, the closing action of the packaging box is completed.

[0035] The working principle and working process of the present invention are as follows:

[0036] The conveying mechanism 2 conveys the packaging box filled with the product to the folding tongue cover mechanism 3, and the folding tongue cover swing arm 33 folds the front ear and the back ear into the packaging box in sequence, and then the upper cover push plate 44 of the upper cover push mechanism 4 presses the upper cover of the packaging box in the direction of the opening to complete the action of pressing the upper cover. When the packaging box is conveyed to the front cover pushing mechanism 5, the folding edge 57 of the front cover push plate 53 moves from top to bottom to press down the front cover of the packaging box to complete the closing of the cover.

[0037] The above embodiments and drawings do not limit the product form and style of the present invention. Any appropriate changes or modifications made by ordinary technicians in the relevant technical field should be deemed to be within the patent scope of the present invention.

Claims

1. A packaging box automatic lid closing device, comprising: A frame, a conveying mechanism arranged on the frame, a folding tongue cover mechanism, a cover pushing mechanism and a front cover pushing mechanism arranged on one side of the conveying mechanism and arranged in sequence from the front end of the conveying direction of the conveying mechanism to the rear; the folding tongue cover mechanism includes a tongue cover support seat, a folding tongue cover swing rod and a folding tongue cover swing arm, the tongue cover support seat is fixedly arranged on the frame, the folding tongue cover swing rod is arranged on the tongue cover support seat and connected to the transmission shaft of the conveying mechanism, and the folding tongue cover swing arm is correspondingly arranged above the chain of the conveying mechanism; the cover pushing mechanism includes a base, a turntable, a cover pushing swing arm and a cover push plate, the base is arranged on the frame, the turntable is arranged on the base and connected to the transmission shaft of the conveying mechanism, one end of the cover pushing swing arm is arranged on the turntable, and the other end of the cover pushing swing arm is connected to the cover push plate; the front cover pushing mechanism includes a mounting seat, a transmission mechanism and a front cover push plate, the mounting seat is arranged on the frame, the transmission mechanism is arranged on the mounting seat, and the front cover push plate is connected to the transmission mechanism; The transmission shaft of the conveying mechanism includes a driving shaft connected to the driving mechanism, a driven shaft and multiple sets of transmission gears, the transmission gears include a first transmission gear and a second transmission gear, the driving mechanism is arranged on the frame and its output shaft is arranged vertically to the conveying chain, the output shaft of the driving mechanism is connected to the driving shaft, and the driving shaft is sleeved with a first transmission gear meshed with the conveying chain at a position corresponding to the conveying chain, the driven shaft is arranged at the end of the driving shaft and arranged along the length direction of the conveying chain, the driven shaft is connected to the driving shaft through the second transmission gear, the second transmission gear is a bevel gear, and the driven shaft is connected to the upper cover pushing mechanism and the front cover pushing mechanism through the bevel gear; The folding tongue cover mechanism also includes: a folding tongue cover connecting rod, a connecting rod block, a connecting rod guide block, a folding tongue cover transmission rod and a transmission connecting rod. The middle part of the folding tongue cover connecting rod is pivotally connected to the tongue cover support seat. The two ends of the folding tongue cover connecting rod are respectively provided with a long groove. One end of the connecting rod block is sleeved on the folding tongue cover swing rod. The other end of the connecting rod block is arranged in the long groove at one end of the folding tongue cover connecting rod. One end of the folding tongue cover transmission rod is arranged in the other long groove of the folding tongue cover connecting rod. The other end of the folding tongue cover transmission rod is connected to one end of the transmission connecting rod. The other end of the transmission connecting rod is connected to the cover pushing mechanism. The connecting rod guide block is fixed on the tongue cover support seat. The connecting rod guide block is provided with a guide hole for the folding tongue cover transmission rod to pass through. The cover pushing mechanism is provided with two rotating discs and two swing arms, the two rotating discs are respectively fixed on the two gear discs, the bottom of the rotating shafts of the two gear discs are connected to the transmission connecting rod of the folding tongue cover mechanism, one end of the two swing arms is fixed to the top of the rotating shafts of the two gear discs, and the other end of the swing arms is fixed to the cover pushing plate, the gear disc is meshed with the driving gear, and the rotating shaft of the driving gear is connected to the driven shaft of the conveying mechanism through the bevel gear; The transmission mechanism of the front cover pushing mechanism includes a transmission gear, a transmission shaft and a front cover pushing swing arm. The transmission shaft is connected to the driven shaft of the conveying mechanism through a bevel gear. The transmission gear is connected to the transmission shaft. One end of the front cover pushing swing arm is fixedly matched with the shaft of the transmission gear. The other end of the front cover pushing swing arm is connected to the front cover pushing plate. The front end of the front cover pushing plate forms an arc-shaped transition folded edge. When the packaging box is transferred from the folding tongue cover mechanism to the upper cover pushing mechanism, the upper cover pushing swing arm rotates counterclockwise or clockwise to make the upper cover pushing plate press the upper cover of the packaging box toward the opening direction from the back to the front, thus completing the upper cover pressing action; When the packaging box is conveyed to the front cover pushing mechanism, the folded edge of the front cover pushing plate moves from top to bottom to press the front cover of the packaging box down. After the packaging box passes through the front cover guiding mechanism, the front cover will tilt upward, and the folded edge will press the front cover down accordingly to ensure that the front cover is pressed into place, thus completing the front cover pressing action.

2. The automatic lid closing device for packaging boxes according to claim 1, characterized in that: An upper cover guiding mechanism is also arranged between the upper cover pushing mechanism and the front cover pushing mechanism. The upper cover guiding mechanism is arranged on the side of the conveying mechanism on the same side of the upper cover pushing mechanism. The upper cover guiding mechanism includes an upper cover guide rod and an upper cover pressing plate. The upper cover guide rod is arranged on the upper cover pressing plate. One end of the upper cover pressing plate is fixed on the frame and the other end faces the conveying mechanism. The upper cover guide rod is inclined upward from the upper cover pressing plate toward the direction close to the upper cover pushing mechanism.

3. The automatic lid closing device for packaging boxes according to claim 1, characterized in that: A front cover guiding mechanism is also arranged between the upper cover pushing mechanism and the front cover pushing mechanism. The front cover guiding mechanism is arranged on the side of the conveying mechanism opposite to the upper cover pushing mechanism. The front cover guiding mechanism includes a supporting base and a front cover guide plate. The supporting base is fixed on the frame. One end of the front cover guide plate is fixed on the front cover guide plate, and the other end is arranged obliquely above the conveying chain of the conveying mechanism.

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