Automatic bottom closing mechanism of carton folding machine

Abstract

The application relates to a paper box automatic bottom buckling mechanism of a paper folding machine, which comprises a transmission assembly for conveying a semi-finished product packaging box, an upper pressing plate arranged along a feeding direction of the transmission assembly, a first side pressing plate, a second side pressing plate, a guide baffle and a buckling pressing plate; the transmission assembly is used for conveying the semi-finished product packaging box with completed upper paper plate and side paper plate pre-pressing to a guide baffle station; the guide baffle is used for guiding a lower paper plate of the packaging box, so that the lower paper plate is automatically upwardly folded; the buckling pressing plate is arranged at the rear side of the guide baffle and is used for downwardly pressing the folded lower paper plate, so that the lower paper plate, the upper paper plate and the two side paper plates are buckled with each other, and bottom cover forming of the packaging box is completed; the application has the effects of greatly improving bottom forming quality and structural stability of the packaging box, effectively improving product yield, being high in automation degree, reducing production cost and improving production efficiency.

Description

Technical Field

[0001] This application relates to the technical field of paper folding machines, and in particular to an automatic bottom-locking mechanism for a paper folding machine. Background Technology

[0002] Currently, packaging boxes, as the core carrier for product packaging and storage, are widely used in many industries such as food, daily necessities, electronic products, and gifts. Among them, the four-piece interlocking cardboard bottom cover is the most common bottom structure for paper packaging boxes. It has the advantages of structural stability, good load-bearing capacity, low production cost, and the ability to be folded and laid flat for transportation, making it the mainstream bottom forming structure for packaging boxes on the market. The interlocking and forming of the bottom of the packaging box is a key process in packaging processing and production, directly determining the finished product quality, production efficiency, and yield rate.

[0003] Currently, most small and medium-sized packaging manufacturers rely on manual bottom-sealing for these four-piece bottom-cover boxes. This manual process involves operators pressing the top, side, and bottom cardboard pieces sequentially to seal the box. This is cumbersome, labor-intensive, and prone to inconsistencies in pressure and placement, easily leading to problems such as incomplete sealing, loosening, misalignment, and creases. This results in a loose bottom, insufficient load-bearing capacity, and a low product yield. Furthermore, manual production efficiency is limited and cannot meet the demands of large-scale packaging box production. Existing automated bottom-sealing equipment often uses a synchronous stamping design, simultaneously pressing and sealing all four bottom-cover cardboard pieces. However, this structure has poor adaptability; for boxes with varying paper hardness, it easily leads to localized cardboard damage, tearing, or insufficient adhesion between the pieces. Utility Model Content

[0004] This application provides an automatic bottom-locking mechanism for paper boxes in a paper folding machine, which significantly improves the forming quality and structural stability of the bottom of the packaging box, effectively increases the product yield, has a high degree of automation, reduces production costs, and improves production efficiency.

[0005] The paper box automatic bottom-locking mechanism for a paper folding machine provided in this application adopts the following technical solution:

[0006] An automatic bottom-locking mechanism for a paper box of a folding machine includes a transmission assembly for conveying a semi-finished packaging box, an upper pressure plate, a first side pressure plate, a second side pressure plate, a guide baffle, and a locking pressure plate arranged along the feeding direction of the transmission assembly.

[0007] The transmission assembly is used to transport the semi-finished packaging box with the upper and side cardboard pre-pressed to the guide baffle station. The guide baffle is used to guide the lower cardboard of the packaging box so that the lower cardboard automatically folds upward. The fastening plate is set on the rear side of the guide baffle and is used to press down the folded lower cardboard so that the lower cardboard, upper cardboard and side cardboards fasten together to complete the bottom cover forming of the packaging box.

[0008] Preferably, the first side pressure plate and the second side pressure plate are driven independently, and their operation sequence is staggered to complete the inward pressing action of the corresponding side paperboard in sequence.

[0009] Preferably, the guide baffle is provided with an inclined guide surface facing the direction of packaging box conveying. The inclined guide surface is adapted to the lower cardboard of the packaging box. When the semi-finished packaging box moves with the transmission component, the lower cardboard slides against the inclined guide surface and automatically folds upward.

[0010] Preferably, the upper pressure plate, the first side pressure plate, the second side pressure plate and the fastening pressure plate are all equipped with independent driving components. The driving components work together to realize the step-by-step automated operation of pre-pressing the upper cardboard, pressing the side cardboard step by step, guiding and folding the lower cardboard, and fastening the whole.

[0011] Preferably, a limiting baffle is provided on the second side pressure plate. The limiting baffle extends along the feeding direction of the transmission assembly. The limiting baffle is used to limit the semi-finished packaging box after the upper cardboard and side cardboard have been pre-pressed until the semi-finished packaging box is conveyed to the fastening station of the fastening pressure plate.

[0012] Preferably, it also includes a translation cylinder, wherein the second side pressure plate is disposed on the piston rod of the translation cylinder, and the translation cylinder is used to drive the second side pressure plate and the limiting baffle to reciprocate along the feeding direction of the transmission assembly.

[0013] Preferably, the transmission assembly includes a transmission seat, a conveyor belt rotatably disposed on the transmission seat, and clamping seats arranged sequentially at intervals on the conveyor belt, wherein a clamping groove for clamping and limiting the packaging box is formed between adjacent clamping seats.

[0014] Preferably, the pressing surface of the fastening plate is a planar structure, and its width is adapted to the pressing area width of the lower cardboard.

[0015] In summary, this application includes at least one of the following beneficial technical effects:

[0016] The process employs a step-by-step, orderly pressing and forming method. First, the top cardboard is fixed, then the cardboard on both sides is pressed down in sequence. Finally, the bottom cardboard is precisely guided by a guide baffle to automatically flip up, and the overall snap-fit ​​is completed with the snap-fit ​​plate. This effectively avoids problems such as cardboard tearing, misalignment, and loose snap-fit ​​that are prone to occur in traditional one-piece synchronous stamping. It precisely controls the folding angle and pressing depth of each cardboard, ensuring that the cardboard at the bottom of the box is tightly interlocked, with high forming regularity. This significantly improves the forming quality and structural stability of the bottom of the packaging box, and effectively increases the product yield.

[0017] The entire system can automatically complete all the snap-fitting processes for the bottom cover of packaging boxes without human intervention, completely replacing traditional manual bottom-sealing operations, significantly reducing labor input, lowering labor costs and the rate of human error. At the same time, the mechanized continuous operation offers stable speed, adapting to continuous production line modes, effectively improving the production efficiency of packaging box bottom sealing, and meeting the needs of large-scale, high-volume production for enterprises.

[0018] The step-by-step pressing and guiding molding structure design can be adapted to four-piece snap-fit ​​bottom lid packaging boxes with different paper hardness, making it more adaptable and able to meet the flexible production needs of small and medium-sized packaging enterprises, with strong market applicability. Attached Figure Description

[0019] Figure 1 This is a front structural diagram of an embodiment of this application in which a semi-finished product packaging box is placed;

[0020] Figure 2 yes Figure 1 A structural diagram from a rear view;

[0021] Figure 3 yes Figure 2 A partial structural diagram showing the unfinished product packaging box.

[0022] Explanation of reference numerals in the attached drawings: 1. Transmission assembly; 10. Transmission seat; 11. Conveyor belt; 12. Clamping seat; 13. Clamping groove; 14. First assembly frame; 15. Pressing cylinder; 16. Second assembly frame; 160. Rotating frame; 17. Third assembly frame; 2. Upper pressure plate; 3. First side pressure plate; 4. Second side pressure plate; 5. Guide baffle; 50. Inclined guide surface; 6. Fastening pressure plate; 60. Fastening cylinder; 7. Limiting baffle; 8. Translation cylinder. Detailed Implementation

[0023] The present application will be further described in detail below with reference to the accompanying drawings.

[0024] This application discloses an automatic bottom-locking mechanism for a paper box in a paper folding machine.

[0025] Reference Figure 1 , Figure 2The automatic bottom-locking mechanism of the paper box of the folding machine includes a transmission assembly 1 for conveying semi-finished packaging boxes, an upper pressure plate 2, a first side pressure plate 3, a second side pressure plate 4, a guide baffle 5, and a locking pressure plate 6 arranged along the feeding direction of the transmission assembly 1.

[0026] like Figure 2 , Figure 3 As shown, the transmission assembly 1 includes a transmission base 10, a conveyor belt 11 rotatably mounted on the transmission base 10, and a plurality of clamping seats 12 arranged sequentially and evenly at intervals on the conveyor belt 11. A clamping groove 13 for clamping and limiting the packaging box is formed between two adjacent clamping seats 12. In this embodiment, the conveyor belt 11 is a chain. Under the drive of an external sprocket meshing with it and a motor, the conveyor belt 11 drives each clamping seat 12 to rotate synchronously along the feeding direction.

[0027] like Figure 2 , Figure 3 As shown, a first assembly frame 14 is fixedly installed on the transmission base 10. A pressing cylinder 15 with a piston rod facing downward towards the clamping seat 12 is fixedly installed on the top of the first assembly frame 14. The upper pressing plate 2 is fixedly installed at the bottom of the piston rod of the pressing cylinder 15. The pressing cylinder 15 is used to drive the upper pressing plate 2 to move up and down in the vertical direction. When the semi-finished packaging box is transported to the area below the upper pressing plate 2, the pressing cylinder 15 drives the upper pressing plate 2 to press down the upper cardboard.

[0028] like Figure 2 , Figure 3 As shown, a second assembly frame 16 located behind the first assembly frame 14 is also fixedly installed on the transmission base 10. A rotating frame 160 driven by a rotary motor is rotatably mounted on the second assembly frame 16, and the rotation axis of the rotating frame 160 is vertically arranged. A first side pressure plate 3 is fixedly installed at the end of the rotating frame 160. The rotating frame 160 drives the first side pressure plate 3 to rotate under the drive of an external rotary motor, and the first side pressure plate 3 folds one side of the sideboard towards the upper board.

[0029] like Figure 2 , Figure 3 As shown, a third assembly frame 17 located behind the second assembly frame 16 is also fixedly installed on the transmission base 10. A translation cylinder 8 is fixedly installed on the third assembly frame 17. The piston rod of the translation cylinder 8 faces the second assembly frame 16, and the piston rod of the translation cylinder 8 reciprocates along the feeding direction of the transmission assembly 1. The second side pressure plate 4 is fixedly installed on the piston rod of the translation cylinder 8. When the upper pressure plate 2 folds the upper cardboard downwards, as the semi-finished packaging box is conveyed backwards, the second side pressure plate 4 pushes one side cardboard to fold towards the upper cardboard. Then, the first side pressure plate 3 folds the other side cardboard towards the upper cardboard in the same way.

[0030] like Figure 2 , Figure 3 As shown, a limiting baffle 7 is integrally formed at the end of the second side pressure plate 4 away from the first assembly frame 14, and the length of the limiting baffle 7 extends along the feeding direction of the transmission assembly 1. The limiting baffle 7 is used to limit the semi-finished packaging box with the upper cardboard and the cardboard on both sides pre-pressed until the semi-finished packaging box is conveyed to the fastening station of the fastening pressure plate 6.

[0031] like Figure 1 , Figure 2 As shown, the guide baffle 5 is located between the fastening pressure plate 6 and the second side pressure plate 4. An inclined guide surface 50 is bent into the side wall of the guide baffle 5 facing the direction of the packaging box conveying. The inclined guide surface 50 is located on the conveying path of the lower cardboard and is adapted to the lower cardboard of the packaging box. When the semi-finished packaging box moves to the position of the inclined guide surface 50 following the transmission assembly 1, the lower cardboard will slide against the inclined guide surface 50 and automatically fold upwards. Finally, the lower cardboard will gradually adhere to the outside of the limiting baffle 7. During the movement of the semi-finished packaging box following the transmission assembly 1, the second side pressure plate 4 and the limiting baffle 7 will slowly move along the feeding direction of the semi-finished packaging box under the drive of the translation cylinder 8.

[0032] like Figure 1 , Figure 3 As shown, a snap-fit ​​cylinder 60 is also fixedly installed on the third assembly frame 17, located behind the translation cylinder 8. The piston rod of the snap-fit ​​cylinder 60 extends and retracts horizontally. The snap-fit ​​pressure plate 6 is fixedly installed at the end of the piston rod of the snap-fit ​​cylinder 60. The snap-fit ​​cylinder 60 is used to drive the snap-fit ​​pressure plate 6 to press down the folded lower cardboard in the horizontal direction, so that the lower cardboard, upper cardboard, and side cardboards snap together to complete the forming of the bottom cover of the packaging box. The pressing working surface of the snap-fit ​​pressure plate 6 is a planar structure, and its width is adapted to the pressing area width of the lower cardboard. When the semi-finished packaging box moves to the snap-fit ​​station, the second side pressure plate 4 and the limiting baffle 7 will move away from the snap-fit ​​pressure plate 6 under the push of the translation cylinder 8 until the limiting baffle 7 moves out of the outside of the semi-finished packaging box. Then the snap-fit ​​cylinder 60 pushes the snap-fit ​​pressure plate 6 to press down the folded lower cardboard, so that the lower cardboard, upper cardboard, and side cardboards snap together to complete the forming of the bottom cover of the packaging box. At this point, the second side pressure plate 4, which moves back, will push the side cardboard of the rear packaging box to fold towards the upper cardboard, realizing a new round of folding process. The entire process is seamlessly connected, ensuring production efficiency.

[0033] like Figure 2 , Figure 3 As shown, the upper pressure plate 2, the first side pressure plate 3, the second side pressure plate 4 and the fastening pressure plate 6 are all equipped with independent driving components. The driving components work together to realize the step-by-step automated operation of pre-pressing the upper cardboard, pressing the side cardboard step by step, guiding and folding the lower cardboard, and fastening the whole.

[0034] The implementation principle is as follows: the first side pressure plate 3 and the second side pressure plate 4 are driven independently, and their operation sequence is staggered, completing the inward pressing action of the corresponding side cardboard in sequence. A step-by-step, orderly pressing and forming method is adopted. First, the upper cardboard is fixed, then the two side cardboards are pressed firmly in sequence, and finally, the lower cardboard is precisely guided by the guide baffle 5 to automatically flip upward, cooperating with the snap-fit ​​pressure plate 6 to complete the overall snap-fit. This effectively avoids problems such as cardboard tearing, misalignment, and loose snap-fit ​​that are prone to occur in traditional one-piece synchronous stamping. It precisely controls the folding angle and pressing depth of each cardboard, ensuring that the cardboard at the bottom of the box is tightly interlocked, with high forming regularity, significantly improving the forming quality and structural stability of the bottom of the packaging box, and effectively increasing the product yield.

[0035] This entire system can automatically complete the entire snap-fit ​​process for the bottom cover of packaging boxes without manual intervention, completely replacing traditional manual bottom-fitting operations. This significantly reduces labor input, lowers labor costs, and reduces the rate of human error. Simultaneously, the mechanized continuous operation offers stable speed, adapting to continuous production lines and effectively improving the production efficiency of packaging box bottom sealing, meeting the needs of large-scale, high-volume production. The system features fewer components and a simplified structure, eliminating the complex transmission and stamping structures of existing large-scale bottom-fitting equipment, resulting in lower manufacturing, debugging, and maintenance costs. The step-by-step pressing and guiding forming design allows for adaptation to four-piece snap-fit ​​bottom cover packaging boxes with varying paper hardness, offering wider adaptability and meeting the flexible production needs of small and medium-sized packaging enterprises, making it highly marketable.

[0036] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An automatic bottom-locking mechanism for a paper box in a paper folding machine, characterized in that: It includes a transmission assembly (1) for conveying semi-finished packaging boxes, an upper pressure plate (2) arranged along the feeding direction of the transmission assembly (1), a first side pressure plate (3), a second side pressure plate (4), a guide baffle (5), and a fastening pressure plate (6). The transmission component (1) is used to transport the semi-finished packaging box with the upper cardboard and side cardboard pre-pressed to the guide baffle (5) station. The guide baffle (5) is used to guide the lower cardboard of the packaging box so that the lower cardboard will automatically fold upward. The fastening plate (6) is set on the back side of the guide baffle (5) and is used to press down the folded lower cardboard so that the lower cardboard, upper cardboard and side cardboards fasten together to complete the bottom cover forming of the packaging box.

2. The automatic bottom-locking mechanism for the paper box of the folding machine according to claim 1, characterized in that: The first side pressure plate (3) and the second side pressure plate (4) are driven independently and their operation sequence is staggered, so as to complete the inward pressing action of the corresponding side plate in sequence.

3. The automatic bottom-locking mechanism for the paper box of the folding machine according to claim 2, characterized in that: The guide baffle (5) is provided with an inclined guide surface (50) facing the direction of conveying the packaging box. The inclined guide surface (50) is adapted to the lower cardboard of the packaging box. When the semi-finished packaging box moves with the transmission component (1), the lower cardboard slides against the inclined guide surface (50) and automatically flips upward.

4. The automatic bottom-locking mechanism for the paper box of the folding machine according to claim 1, characterized in that: The upper pressure plate (2), the first side pressure plate (3), the second side pressure plate (4) and the fastening pressure plate (6) are all equipped with independent driving components. The driving components work together to realize the step-by-step automated operation of pre-pressing the upper cardboard, pressing the side cardboard step by step, guiding and folding the lower cardboard, and fastening the whole.

5. The automatic bottom-locking mechanism for the paper box of the folding machine according to claim 4, characterized in that: A limiting baffle (7) is provided on the second side pressure plate (4). The limiting baffle (7) extends along the feeding direction of the transmission assembly (1). The limiting baffle (7) is used to limit the semi-finished packaging box after the upper and side paperboards have been pre-pressed until the semi-finished packaging box is transported to the fastening station of the fastening pressure plate (6).

6. The automatic bottom-locking mechanism for the paper box of the folding machine according to claim 5, characterized in that: It also includes a translation cylinder (8), the second side pressure plate (4) is disposed on the piston rod of the translation cylinder (8), the translation cylinder (8) is used to drive the second side pressure plate (4) and the limiting baffle (7) to reciprocate along the feeding direction of the transmission assembly (1).

7. The automatic bottom-locking mechanism for the paper box of the folding machine according to claim 6, characterized in that: The transmission assembly (1) includes a transmission seat (10), a conveyor belt (11) rotatably disposed on the transmission seat (10), and clamping seats (12) arranged sequentially at intervals on the conveyor belt (11), with clamping grooves (13) formed between adjacent clamping seats (12) for clamping and limiting the packaging box.

8. The automatic bottom-locking mechanism for the paper box of the folding machine according to claim 7, characterized in that: The pressing surface of the fastening plate (6) is a planar structure, and its width is adapted to the pressing area width of the lower cardboard.

Images