A type of paper box forming machine

Abstract

This utility model discloses a cardboard box forming machine, including a frame, on which are mounted a plate-shaped box blank feeding mechanism, an end piece gluing mechanism, an end piece pressing mechanism, a cylindrical conveying mechanism, a plate-shaped box blank feeding mechanism, and a central control device. The cylindrical conveying mechanism includes a chain conveyor, which comprises a driving sprocket, a driven sprocket, and a conveying chain. A chain plate is fixed on the conveying chain, and a partition plate perpendicular to the chain plate is fixed at the rear edge of the chain plate. A pressure plate extending rearward is provided at the upper end of the partition plate, thereby forming a cylindrical blank forming conveying trough surrounded by the chain plate, two adjacent partition plates, and the pressure plate in the straight running section of the conveying chain. The width and height of the cylindrical blank forming conveying trough are equal to or slightly larger than the width and height of the cardboard box. When this cardboard box forming machine is working, cardboard boxes will not be stuck in one station, and damage to cardboard boxes in one station will not affect the normal forming of cardboard boxes in other stations. The machine has high operational stability and a low scrap rate.

Description

Technical Field

[0001] This utility model relates to a paper box forming machine, and more particularly to a paper box forming machine that sorts and glues sheet-shaped box blanks into rectangular paper boxes. Background Technology

[0002] Paper mills cut out cardboard for producing paper boxes according to the unfolded diagram of the box. Folding lines are cut on the cardboard, and then the cardboard is folded along the diagonal folds of the box and glued along the edges to form a flat cylinder, i.e., a sheet-shaped box blank. When making three-dimensional paper boxes from this sheet-shaped blank, it is necessary to first shape the blank into a rectangular cylinder, and then glue the upper and lower end pieces of the rectangular cylinder to form the paper box. Early paper box forming machines completed the expansion into a cylinder, end piece gluing, and gluing processes of the sheet-shaped blank in a fixed station. When a paper box got stuck at the station, subsequent paper boxes would continue to stack at the station, unable to be properly shaped into cylinders and glued, resulting in a large amount of waste. Furthermore, in order to increase output, the time the paper boxes spent at the station needed to be minimized during operation, so that the glue had not cured before the paper boxes were moved out of the station, resulting in weak end piece adhesion and easy delamination and deformation. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a paper box forming machine that addresses the above-mentioned shortcomings of the existing technology. When the paper box forming machine is working, the paper boxes will not be stuck in one station, and the damage of the paper boxes in one station will not affect the normal forming of paper boxes in other stations. The machine has high stability and low scrap rate.

[0004] The technical solution adopted to solve the technical problem is as follows: A paper box forming machine includes a frame, a plate-shaped box blank feeding mechanism that pushes stacked plate-shaped box blanks backward to the discharge position, an end-piece gluing mechanism that applies glue to the upper end pieces at both ends of a cylindrical box blank, an end-piece pressing mechanism that presses the lower end pieces at both ends of the cylindrical box blank onto the upper end pieces to bond the lower end pieces together with the upper end pieces, a mechanism that shapes the plate-shaped box blanks into cylindrical box blanks, and a cylindrical box blank that sequentially passes through the end-piece gluing mechanism and the end-piece pressing mechanism before being removed from the paper box forming machine by a cylindrical conveying mechanism, and the plate-shaped box blanks are taken out from the discharge position of the plate-shaped box blank feeding mechanism and placed into the forming machine. The cylindrical conveying mechanism includes a plate-shaped box blank feeding mechanism and a central control device for controlling the operating speed and frequency of the aforementioned mechanism. The cylindrical conveying mechanism includes a chain conveyor, which includes a driving sprocket, a driven sprocket, and a conveying chain. A chain plate is fixed on the conveying chain, and a partition plate perpendicular to the chain plate is fixed at the rear edge of the chain plate. A pressure plate extending backward is provided at the upper end of the partition plate, thereby forming a cylindrical blank forming conveying trough surrounded by the chain plate, two adjacent partition plates, and the pressure plate in the straight running section of the conveying chain. The width and height of the cylindrical blank forming conveying trough are equal to or slightly larger than the width and height of the cardboard box, respectively.

[0005] As a further improvement of this utility model: a support insert is provided on the side of the conveyor chain corresponding to the end piece gluing mechanism and the end piece pressing mechanism, which can be inserted between the upper end piece and the cylindrical box blank to support the upper end piece.

[0006] As a further improvement of this utility model: a pre-folding pressure plate is provided in front of the end piece coating mechanism to pre-fold the upper end piece downwards before the cylindrical box blank reaches the end piece coating mechanism. The pre-folding pressure plate is a vertical pressure plate fixed on both sides of the coating head and in front of the dispensing tube.

[0007] As a further improvement of this utility model: a shaping mechanism is provided above the straight running section on the conveyor chain to make the cylindrical box blank sharp. The shaping mechanism includes a shaping frame, a shaping pressure plate that can be obliquely extended and retracted is installed in the slide groove of the shaping frame, and a shaping cylinder is also provided on the shaping frame to drive the shaping pressure plate to extend and retract along the slide groove.

[0008] As a further improvement of this utility model: the glue application mechanism includes a glue application frame, a glue application head guide slide is mounted on the glue application frame, a glue application head that can move up and down along the glue application head guide slide is mounted on the glue application head guide slide, a glue dispensing tube is provided at each end of the glue application head to output glue to the outer surface of the upper end piece, and a glue application cylinder is also provided on the glue application frame to drive the glue application head to move up and down along the glue application head guide slide.

[0009] As a further improvement of this utility model: the end piece pressing mechanism includes a pressing wheel disposed below the glue application tube. The pressing wheel is a vertical lifting pressing wheel that can push the lower end piece upward from below to press the lower end piece against the upper end piece. The pressing wheel is fixed to the piston end of the pressing cylinder by a wheel frame.

[0010] As a further improvement of this utility model: two parallel end-plate pressing mechanisms are provided below the dispensing tube along the direction of the conveyor chain.

[0011] As a further improvement of this utility model: the plate-shaped box blank feeding mechanism includes a feeding motor, a feeding rocker arm mounted on the output shaft of the feeding motor, a picking shaft axially connected to the end of the feeding rocker arm, a picking frame fixed on the picking shaft, a plurality of picking suction cups mounted on the picking frame, a synchronous pulley mounted on the picking shaft and the output shaft of the feeding motor, and a synchronous belt between the two synchronous pulleys to rotate the plate-shaped box blank on the picking shaft at a certain angle during the process of being fed from the plate-shaped box blank feeding mechanism to the cylindrical conveying mechanism.

[0012] As a further improvement of this utility model: the paper box forming machine also includes a synchronization mechanism, which includes a synchronization toothed disc installed at the end of the drive sprocket shaft of the chain conveyor. The synchronization toothed disc is provided with synchronization teeth. The spacing angle of the synchronization teeth is equal to the angle between adjacent partitions of the arc running section of the conveyor chain. The synchronization mechanism also includes a photoelectric sensor that cooperates with the synchronization teeth and outputs signals to the central control device.

[0013] As a further improvement of this utility model: the plate-shaped box blank supply mechanism includes a transmission belt driven by a feeding motor, longitudinal baffles are provided on both sides of the transmission belt, and a transverse baffle is provided at the rear end of the transmission belt to block the lower edge of the plate-shaped box blank.

[0014] Beneficial Effects: The cardboard box forming machine of this utility model adopts the aforementioned cylindrical conveying mechanism, which includes a chain conveyor. The chain conveyor includes a driving sprocket, a driven sprocket, and a conveying chain. A chain plate is fixed on the conveying chain, and a partition plate perpendicular to the chain plate is fixed at the rear edge of the chain plate. A pressure plate extending backward is provided at the upper end of the partition plate. Thus, a cylindrical blank forming conveying trough is formed in the straight running section of the conveying chain, which is surrounded by the chain plate, two adjacent partition plates, and the pressure plate. The width and height of the cylindrical blank forming conveying trough are equal to the width and height of the cardboard box, respectively. Each cylindrical blank forming conveying trough constitutes an independent moving station. When the machine is running, each station moves backward in sequence to complete the process of sorting the plate-shaped box blank into a cylindrical blank, applying glue, and bonding. Therefore, when a cardboard box in one cylindrical blank forming conveying trough is damaged or stuck in the station, it will not affect the normal forming of cardboard boxes in other cylindrical blank forming conveying troughs. The machine has high operating stability and a low scrap rate. Because of the technical feature of having support inserts on the sides of the conveyor chains corresponding to the end-piece gluing mechanism and the end-piece pressing mechanism, which can be inserted between the upper end piece and the cylinder to support the upper end piece, the end-piece pressing mechanism can tightly bond the upper and lower end pieces together during the bonding process. Furthermore, during pressing, the glue droplets can be crushed into a film, which not only shortens the curing time of the glue but also increases the bonding area, making the formed cardboard box less prone to delamination. The technical feature of having a pre-folding pressure plate in front of the end-piece gluing mechanism, which pre-folds the upper end piece downwards before the cylindrical box blank reaches the end-piece gluing mechanism, reduces the contact angle between the upper end piece and the dispensing tube, preventing the end of the dispensing tube from puncturing or tearing the upper end piece of the cardboard box during the gluing process. By employing a shaping mechanism above the straight section of the conveyor chain to sharpen the edges of the cylindrical box blank, the shaping mechanism includes a shaping frame, a shaping pressure plate that can extend and retract obliquely within the groove of the shaping frame, and a shaping cylinder on the shaping frame that drives the shaping pressure plate to extend and retract along the groove. This overcomes the drawbacks of diagonal extrusion forming of the cylindrical blank, which results in indistinct non-folded corners and easy springback. As a result, the non-folded corners of the formed paper box are sharper and less prone to deformation. Because the glue coating mechanism includes a glue coating frame, a glue coating head guide slide mounted on the glue coating frame, a glue coating head mounted on the glue coating head guide slide that can move up and down along the glue coating head guide slide, a glue dispensing tube at each end of the glue coating head that outputs glue to the outer surface of the upper end piece, and a glue coating cylinder on the glue coating frame that drives the glue coating head to move up and down along the glue coating head guide slide, the glue coating mechanism operates intermittently, so that the glue coating process of the cardboard boxes in each blank forming conveyor groove does not affect each other, and glue does not easily accumulate at the end of the glue dispensing tube.Because the end-piece pressing mechanism includes a pressing roller located below the glue-applying tube, and this pressing roller is a vertically lifting pressing roller that can push the lower end piece upwards from below and press it against the upper end piece, and the pressing roller is fixed to the piston end of the pressing cylinder via a wheel frame, no damage is caused to the lower and upper end pieces during the pressing process. Furthermore, the use of two parallel end-piece pressing mechanisms located below the glue-applying tube along the conveyor chain's travel direction increases the pressing time of the two end pieces after glue application, making it less prone to detachment after the end pieces leave the pressing mechanism. The use of a plate-shaped box blank feeding mechanism, including a feeding motor with a feeding rocker arm mounted on its output shaft, a picking shaft connected to the end of the feeding rocker arm, a picking frame fixed on the picking shaft, and multiple picking suction cups mounted on the picking frame, along with a synchronous pulley on both the picking shaft and the feeding motor's output shaft, and a synchronous belt between the two synchronous pulleys to rotate the plate-shaped box blank at a certain angle on the picking shaft during its feeding from the plate-shaped box blank supply mechanism to the tube conveying mechanism, results in faster feeding speed and more precise feeding angle and position. Furthermore, the cardboard box forming machine also includes a synchronization mechanism, comprising a synchronization gear disc mounted on the drive sprocket shaft of the chain conveyor, with synchronization teeth on the gear disc. The spacing angle of the synchronization teeth is equal to the angle between adjacent partitions in the arc running section of the conveyor chain. The synchronization mechanism also includes a photoelectric sensor that cooperates with the synchronization teeth and outputs signals to the central control device, further enhancing the precision of the coordination between the various mechanisms and achieving high-speed pulsed forming of the cardboard box. The use of a plate-shaped box blank feeding mechanism, including a transmission belt driven by a feeding motor, longitudinal baffles on both sides of the transmission belt, and a transverse baffle at the rear end of the transmission belt to block the lower edge of the plate-shaped box blank, makes the feeding of the plate-shaped box blank more stable and helps to improve the machine's operating speed. Attached Figure Description

[0015] The paper box forming machine of this utility model will be further described in detail below with reference to the accompanying drawings.

[0016] Figure 1 This is an overall structural diagram of the paper box forming machine of this utility model;

[0017] Figure 2 This is another overall structural view of the paper box forming machine of this utility model;

[0018] Figure 3 Enlarged structural diagram of the plate-shaped box blank supply mechanism;

[0019] Figure 4 This is an enlarged perspective view of the plate-shaped box blank feeding mechanism in the paper box forming machine of this utility model;

[0020] Figure 5This is an enlarged perspective view of the end piece gluing mechanism and the end piece pressing mechanism in the paper box forming machine of this utility model;

[0021] Figure 6 This is an enlarged front view of the tube conveying mechanism in the cardboard box forming machine of this utility model;

[0022] Figure 7 This is a schematic diagram of the transformation process of the plate-shaped box blank in the cylindrical transport mechanism;

[0023] Figure 8 This is an enlarged perspective view of the support insert in the paper box forming machine of this utility model. Detailed Implementation

[0024] To clearly illustrate the paper box forming machine of this utility model, the conveying direction of the chain conveyor is defined as "backward" and the reverse direction as "forward". At the same time, to clearly show the structure of each part of the paper box forming machine, the valves and air supply lines that provide compressed air to each cylinder are omitted in the attached drawings.

[0025] like Figure 1 As shown, the paper box forming machine of this utility model includes a frame 1, a plate-shaped box blank supply mechanism 3 on the frame for pushing stacked plate-shaped box blanks backward to the discharge position, a plate-shaped box blank feeding mechanism 4 for taking out the plate-shaped box blanks from the discharge position of the plate-shaped box blank supply mechanism and feeding them into the cylindrical conveying mechanism, a cylindrical conveying mechanism 6 for organizing the plate-shaped box blanks into cylindrical box blanks and allowing the cylindrical box blanks to pass sequentially through an end piece gluing mechanism and an end piece pressing mechanism before leaving the paper box forming machine, an end piece gluing mechanism 7 for applying glue to the upper end pieces at both ends of the cylindrical box blank, an end piece pressing mechanism 8 for pressing the lower end pieces 15 at both ends of the cylindrical box blank onto the upper end pieces 14 to bond the lower end pieces and the upper end pieces together, and a central control device 2 for controlling the running speed and operating frequency of the aforementioned mechanisms.

[0026] like Figure 6 As shown, the cylindrical conveying mechanism includes a chain conveyor, which comprises a driving sprocket 68, a driven sprocket 69, and a conveying chain 60. The driving and driven sprockets are of the same specifications, thereby constraining the conveying chain into a rearward arc running section 62, a front arc running section 61, an upper straight running section 63, and a lower straight running section 64. A chain plate 67 is fixed on the conveying chain, and a partition plate 65 perpendicular to the chain plate is fixed at the rear edge of the chain plate. A rearwardly extending pressure plate 66 is provided at the upper end of the partition plate, thereby forming a cylindrical blank forming conveying trough in the straight running section of the conveying chain, which is surrounded by the chain plate, two adjacent partition plates, and the pressure plate. The width and height of the cylindrical blank forming conveying trough are equal to or slightly larger than the width and height of the cardboard box 13 by 0.1-1 mm.

[0027] like Figure 1As shown, a shaping mechanism 5 is provided above the straight section of the conveyor chain above the driving and driven sprockets to sharpen the edges of the cylindrical blank. Figure 2 As shown, the shaping closing mechanism includes a shaping frame 52, a shaping pressure plate 53 that can extend and retract obliquely is installed in the slide groove of the shaping frame, and a shaping cylinder 51 that drives the shaping pressure plate to extend and retract along the slide groove is also provided on the shaping frame.

[0028] like Figure 5 As shown, the glue application mechanism includes a glue application frame 73, a glue application head guide slide 72 mounted on the glue application frame, a glue application head 74 mounted on the glue application head guide slide, a glue application head 74 that can move up and down along the glue application head guide slide, a glue dispensing tube 75 at each end of the glue application head for dispensing glue to the outer surface of the upper end piece, and a glue application cylinder 71 on the glue application frame for driving the glue application head to move up and down along the glue application head guide slide. The glue dispensing tube is connected to an external glue supply device through a glue supply tube. The glue is preferably a hot melt glue, and the glue application head is preferably an electrically heated glue application head that can keep the glue in a molten state.

[0029] like Figure 5 As shown, a support insert 85 is provided on the side of the conveyor chain corresponding to the end piece gluing mechanism and the end piece pressing mechanism. This support insert can be inserted between the upper end piece and the cylinder to support the upper end piece. Figure 8 As shown, the support insert is fixed to the side wall of the frame by the base plate 86. A pre-folding pressure plate is provided in front of the end piece gluing mechanism to pre-fold the upper end piece downward before the cylindrical box blank reaches the end piece gluing mechanism. The pre-folding pressure plate is a vertical pressure plate 84 fixed on both sides of the gluing head and in front of the dispensing tube.

[0030] like Figure 5 As shown, the end piece pressing mechanism includes a pressing wheel 81 disposed below the glue coating tube. The pressing wheel is a vertical lifting pressing wheel that can push the lower end piece upward from below to press the lower end piece against the upper end piece. The pressing wheel is fixed to the end of the pressing cylinder piston 83 by a wheel frame 82, and the pressing cylinder is fixed on the glue coating frame.

[0031] Preferably, two parallel end-piece pressing mechanisms are provided below the dispensing tube along the conveying direction. The center distance between the pressing rollers of the two end-piece pressing mechanisms is equal to the center distance between the adjacent cylindrical blank forming conveying grooves. In this way, when the pressing roller corresponding to the dispensing tube moves upward, the other pressing roller can perform secondary pressing on the two end pieces that have been bonded in another station, thereby increasing the pressing time, allowing the glue to cure, and preventing the cardboard box from delaminating after leaving the cylindrical blank forming conveying groove.

[0032] like Figure 4As shown, the plate-shaped box blank feeding mechanism includes a feeding motor 41, a feeding rocker arm 47 mounted on the output shaft of the feeding motor, a picking shaft 44 shafted to the end of the feeding rocker arm, a picking frame 45 fixed on the picking shaft, and multiple picking suction cups 46 mounted on the picking frame. A synchronous pulley 42 is mounted on both the picking shaft and the output shaft of the feeding motor. A synchronous belt 43 is provided between the two synchronous pulleys to rotate the plate-shaped box blank at a certain angle on the picking shaft during the process of being fed from the plate-shaped box blank feeding mechanism to the cylindrical conveying mechanism. In this embodiment, the plate-shaped box blanks in the plate-shaped box blank feeding mechanism are vertically placed. When the plate-shaped box blank is moved into the cylindrical blank forming conveying trough located in the rear arc running section, it needs to be rotated so that the two folded edges respectively enter the right-angle grooves of the partition and chain plate connection and the right-angle grooves of the partition and pressing plate connection. The picking suction cups are connected to the suction valve and suction pump through vacuum pipelines, and suck up the plate-shaped box blanks through negative pressure.

[0033] like Figure 1 As shown, the cardboard box forming machine also includes a synchronization mechanism 9. (As indicated...) Figure 2 As shown, the synchronization mechanism includes a synchronization gear disc 94 installed at the end of the drive sprocket shaft of the chain conveyor. Synchronization teeth 93 are provided on the synchronization gear disc. The spacing angle of the synchronization teeth is equal to the angle between adjacent partitions of the arc-shaped running section of the conveyor chain. In this embodiment, the spacing angle of the synchronization teeth and the angle between adjacent partitions of the arc-shaped running section of the conveyor chain are both 60 degrees. The synchronization mechanism also includes a photoelectric sensor 92 that cooperates with the synchronization teeth and outputs signals to the central control device. During operation, the photoelectric sensor outputs a synchronization signal to the central control device. The central control device controls the operation of the chain conveyor drive motor 91 and each cylinder based on the synchronization signal, causing the chain conveyor to advance one workstation at a time and pause briefly. During the brief pause of the chain conveyor, each cylinder completes the actions of feeding the plate-shaped box blank, shaping and extruding, applying glue to the end pieces, and pressing, achieving high-speed pulsed production of paper boxes.

[0034] like Figure 3 As shown, the plate-shaped box blank feeding mechanism includes a transmission belt 32 driven by a feeding motor 33, longitudinal baffles 31 on both sides of the transmission belt, and a transverse baffle 34 at the rear end of the transmission belt to block the lower edge of the plate-shaped box blank. The height of the transverse baffle is preferably such that the plate-shaped box blank does not fall and the material suction cup can remove the plate-shaped box blank without damage.

[0035] During machine operation, the plate-shaped box blanks are placed vertically and neatly on the conveyor belt of the plate-shaped box blank supply mechanism. The conveyor belt pushes the plate-shaped box blanks to the horizontal baffle, i.e., the discharge position. The material suction cup of the plate-shaped box blank feeding mechanism picks up the plate-shaped box blanks from the discharge position, rotates them at a certain angle, and then puts them into the cylindrical blank forming conveyor trough, which is still in the arc running section of the conveyor chain and about to enter the straight running section of the conveyor chain. As the cylindrical blank forming conveyor trough enters the straight running section of the conveyor chain, the straight distance between the right-angle groove at the connection between the partition and the chain plate and the right-angle groove at the connection between the partition and the pressure plate gradually decreases. The two folded edges 16 of the plate-shaped box blank are squeezed, causing the plate-shaped box blank to be squeezed into a rectangular cylinder along the score line 17, i.e., a cylindrical box blank. When the cylindrical blank forming conveyor trough carrying the cylindrical box blank passes under the forming mechanism, the forming cylinder is activated, causing the forming pressure plate to slide down along the slide groove. The lower edge of the forming pressure plate is aligned with the cylindrical box blank. The scored lines are folded to create sharp ridges. After shaping, the cylindrical blank moves to the pre-folding pressing area, where the upper end piece is pre-folded downwards. Simultaneously, a support insert is inserted between the upper end piece and the cylindrical blank. The cylindrical blank in the blank forming conveyor moves forward to below the end piece gluing mechanism. The gluing cylinder drives the gluing head and dispensing tube downwards, dripping glue onto the upper surface of the upper end piece. The glued cylindrical blank then moves forward... When the paper reaches the pressing mechanism, the pressing cylinder causes the pressing roller to move upward, pushing the lower end piece onto the upper end piece and cooperating with the support insert to press the upper and lower end pieces together, bonding the cylindrical box blank into a paper box. As the paper box moves forward in the cylindrical blank forming conveyor trough, it is pressed a second time by another pressing roller and then detaches from the support insert to reach the rear arc running section of the conveyor chain. The adjacent partitions change from a parallel state to an angled state, and the formed paper box leaves the paper box forming machine under the action of gravity.

[0036] Figure 7 The diagram illustrates the transformation process of the plate-shaped box blank into a plate-shaped box blank 10, a flat box blank 11, a cylindrical box blank 12, and a finished paper box 13 in the paper box forming machine of this utility model.

Claims

1. A paper box forming machine, comprising a frame, an end-piece gluing mechanism for pushing stacked plate-shaped box blanks backward to a discharge position, an end-piece pressing mechanism for applying glue to the upper end pieces at both ends of a cylindrical box blank, an end-piece pressing mechanism for pressing the lower end pieces at both ends of the cylindrical box blank onto the upper end pieces to bond the lower end pieces together with the upper end pieces, a cylindrical conveying mechanism for shaping the plate-shaped box blanks into cylindrical box blanks and sequentially passing through the end-piece gluing mechanism and the end-piece pressing mechanism before being released from the paper box forming machine, an end-piece feeding mechanism for taking the plate-shaped box blanks from the discharge position of the plate-shaped box blank supply mechanism and feeding them into the cylindrical conveying mechanism, and a central control device for controlling the operating speed and operating frequency of the aforementioned mechanisms, characterized in that: The cylindrical conveying mechanism includes a chain conveyor, which includes a driving sprocket, a driven sprocket, and a conveying chain. A chain plate is fixed on the conveying chain, and a partition plate perpendicular to the chain plate is fixed at the rear edge of the chain plate. A pressure plate extending backward is provided at the upper end of the partition plate, thereby forming a cylindrical blank forming conveying trough surrounded by the chain plate, two adjacent partition plates, and the pressure plate in the straight running section of the conveying chain. The width and height of the cylindrical blank forming conveying trough are equal to the width and height of the carton, respectively.

2. The carton forming machine of claim 1 wherein the The conveyor chains corresponding to the end piece gluing mechanism and the end piece pressing mechanism are provided with support inserts on the side, which can be inserted between the upper end piece and the cylinder to support the upper end piece.

3. The carton forming machine of claim 2 wherein the A pre-folding pressure plate is provided in front of the end piece coating mechanism to pre-fold the upper end piece downwards before the cylindrical box blank reaches the end piece coating mechanism. The pre-folding pressure plate is a vertical pressure plate fixed on both sides of the coating head and in front of the dispensing tube.

4. The carton forming machine of claim 3, wherein: A shaping mechanism is provided above the straight running section of the conveyor chain to make the cylindrical box blank sharp. The shaping mechanism includes a shaping frame, a shaping pressure plate that can extend and retract obliquely in the slide groove of the shaping frame, and a shaping cylinder that drives the shaping pressure plate to extend and retract along the slide groove on the shaping frame.

5. A carton forming machine according to any one of claims 1 to 4, characterised in that: The glue application mechanism includes a glue application frame, a glue application head guide slide is mounted on the glue application frame, a glue application head that can move up and down along the glue application head guide slide is mounted on the glue application head guide slide, a glue dispensing tube is provided at each end of the glue application head to output glue to the outer surface of the upper end piece, and a glue application cylinder is also provided on the glue application frame to drive the glue application head to move up and down along the glue application head guide slide.

6. The carton forming machine of claim 5 wherein: The end piece pressing mechanism includes a pressing roller disposed below the glue application tube. The pressing roller is a vertically lifting pressing roller that can push the lower end piece upward from below to press it against the upper end piece. The pressing roller is fixed to the piston end of the pressing cylinder by a wheel frame, and the pressing cylinder is fixed on the frame.

7. The carton forming machine of claim 6, wherein: Two parallel end-plate pressing mechanisms are provided below the dispensing tube along the conveying direction.

8. The carton forming machine of claim 6, wherein: The plate-shaped box blank feeding mechanism includes a feeding motor, a feeding rocker arm mounted on the output shaft of the feeding motor, a picking shaft axially connected to the end of the feeding rocker arm, a picking frame fixed on the picking shaft, multiple picking suction cups mounted on the picking frame, a synchronous pulley mounted on the picking shaft and the output shaft of the feeding motor, and a synchronous belt between the two synchronous pulleys to rotate the plate-shaped box blank at a certain angle during the process of being fed from the plate-shaped box blank feeding mechanism to the cylindrical conveying mechanism.

9. The carton forming machine of claim 8, wherein: The paper box forming machine also includes a synchronization mechanism, which includes a synchronization toothed disc installed at the end of the drive sprocket shaft of the chain conveyor. The synchronization toothed disc has synchronization teeth, and the spacing angle of the synchronization teeth is equal to the angle between adjacent partitions of the arc running section of the conveyor chain. The synchronization mechanism also includes a photoelectric sensor that cooperates with the synchronization teeth and outputs signals to the central control device.

10. The carton forming machine of claim 1 wherein: The plate-shaped box blank feeding mechanism includes a transmission belt driven by a feeding motor, longitudinal baffles on both sides of the transmission belt, and a transverse baffle at the rear end of the transmission belt to block the lower edge of the plate-shaped box blank.

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