A four-side synchronous folding forming structure for carton

Abstract

The present application relates to the technical field of carton forming, in particular to a four-side synchronous folding forming structure for cartons, comprising a mounting base, further comprising: a forming mechanism arranged on the mounting base and used for receiving and folding a paperboard; a pressing mechanism arranged above the forming mechanism and used for providing a pressing force for the folding forming of the paperboard; the forming mechanism comprises a transmission connecting rod; a two-section edge first folding assembly and a two-section edge second folding assembly, both of which are synchronously driven by the transmission connecting rod and used for performing phased folding on a first two-section edge and a second two-section edge of the paperboard. The two-section edge second folding assembly is driven by the pressing mechanism to deflect the second two-section edge outward by using airflow before the first two-section edge is folded, and actively avoids the contact between the second two-section edge and the corner of the first two-section edge, thereby fundamentally solving the problems of inner buckling, corner wrinkle and rupture caused by pressing wrinkles.

Description

Technical Field

[0001] This invention relates to the field of paper box forming technology, specifically to a structure for synchronously folding and forming paper boxes on all four sides. Background Technology

[0002] As a widely used packaging form in the commodity circulation field, the folding efficiency and forming quality of top-and-bottom paper boxes directly affect the production capacity of packaging lines and the final product presentation. In industrial production scenarios, the folding and forming of top-and-bottom paper boxes is usually completed by specialized equipment, and the execution logic and structural design of the folding process are key factors that determine equipment performance, production costs, and product yield.

[0003] In the existing technology field, the mainstream folding and forming method of top and bottom lid paper boxes mostly adopts the "two-station step-by-step folding" scheme: the cardboard is first folded up at the first station to form a half box with the first and second folded edges upright; then it is transferred to the second station, where the two sets of opposite second folded edges are folded inward by 180° in two separate steps to finally form the shape.

[0004] The aforementioned step-by-step folding process directly leads to a significant increase in the longitudinal length of the equipment, which not only occupies workshop space but also slows down the overall production pace. In addition, there is a long-neglected pain point in actual production: in order to achieve precise folding of each edge of the cardboard box, the cardboard needs to be pre-shaped at the folding position through a pleating process before folding. However, after one edge is folded, the first edge and the second edge are both vertical and abut against each other at the corner. Due to the pleating, the second edge is likely to be excessively folded inward, which makes it easy to interfere with adjacent structures during the actual folding. If the folding is forced, although the folding action can be completed, wrinkles, cracks and other appearance defects will appear at the corners of the second edge, which seriously affects the forming quality. To address this issue, we propose a structure for simultaneous folding and forming of four sides of the cardboard box. Summary of the Invention

[0005] The purpose of this invention is to provide a structure for synchronous folding and forming of four sides of a paper box, so as to overcome the above-mentioned shortcomings in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a structure for synchronous folding and forming of a paper box on four sides, comprising a mounting base, and further comprising: a forming mechanism disposed on the mounting base for receiving and folding the paperboard; and a pressing mechanism disposed above the forming mechanism for providing downward pressure for folding and forming the paperboard.

[0007] The forming mechanism includes a transmission link; a two-section edge folding component and a two-section edge folding component, both of which are synchronously driven by the transmission link and are used to perform staged folding of the two-section edge one and the two-section edge two of the cardboard;

[0008] The two-segment folding component is configured to operate in three stages: the first stage is to adsorb and fix the first folding edge corresponding to the first two-segment folding edge; the second stage is to fold the first two-segment folding edge 180°; and the third stage is to maintain the adsorption state of the first folding edge.

[0009] The two-section edge folding assembly is configured to operate in three stages: in the first stage, airflow is sprayed outward to deflect the two-section edge folding assembly to avoid interference; in the second stage, the airflow is maintained; and in the third stage, the two-section edge folding assembly is folded 180°.

[0010] Preferably, the pressing mechanism includes an electric telescopic rod and a pressing plate. The pressing plate is fixedly connected to and driven by the output shaft of the electric telescopic rod, and the bottom of the pressing plate matches the forming shape of the cardboard.

[0011] Preferably, the structure further includes a mounting base, and the forming mechanism includes a forming substrate, the top of which is provided with a folding frame and a folding tongue frame for folding a section of the folded edge; the transmission linkage is hinged to the top of the mounting base and is driven by the forming substrate.

[0012] Preferably, two sets of two-segment edge-first folding components and two sets of two-segment edge-rear folding components are alternately arranged around the perimeter of the molded substrate. The two-segment edge-first folding components correspond to the position of the first two-segment folding component, and the two-segment edge-rear folding components correspond to the position of the second two-segment folding component.

[0013] Preferably, the two-section edge-folding assembly includes a cylinder; a piston, which is movably installed inside the cylinder; a folding part and a folding transmission part, both of which are disposed on the cylinder; the folding part includes a folding claw and a vacuum suction cup; when the piston moves, it continuously provides a negative pressure environment for the vacuum suction cup; when the piston moves in the second stage, it drives the folding claw to move through the folding transmission part.

[0014] Preferably, the pre-folding transmission unit includes a friction section for driving the pre-folding part, and the front end of the pre-folding transmission unit is located at the initial position of the piston in the second stage.

[0015] Preferably, the first folding part includes a mounting cage; a transmission shaft and a drive shaft, both of which are rotatably mounted on the mounting cage; a folding claw is fixedly mounted on the drive shaft; a vacuum suction cup is fixedly connected to the top of the mounting cage; the vacuum suction cup is connected to the front end of the cylinder through an air passage in the transmission shaft and an air guide pipe.

[0016] Preferably, the two-section rear folding assembly includes a cylinder two; a piston two, which is movably installed inside the cylinder two; a rear folding part and a rear folding drive part, both of which are disposed on the cylinder two; the rear folding part includes a folding claw two and an air nozzle; the piston two provides jet airflow to the air nozzle in the first and second stages; when the piston two moves in the third stage, it drives the folding claw two to move through the rear folding drive part.

[0017] Preferably, the front end of the rear-folding drive unit is located at the initial position of the third stage of the piston.

[0018] Preferably, the rear folding section includes a second mounting cage; a second transmission shaft and a second drive shaft, both of which are rotatably mounted on the second mounting cage; a second folding claw fixedly mounted on the first drive shaft; and an air nozzle fixedly connected to the second folding claw; the air nozzle is connected to the inside of the second cylinder via the second transmission shaft.

[0019] In the above technical solution, the beneficial effects of the present invention are as follows: the two-section edge folding assembly is driven by the pressing mechanism, and before the first two-section edge is folded, the airflow is used to deflect the second two-section edge outward, actively avoiding contact between the second two-section edge and the corner of the first two-section edge, fundamentally solving the problems of inward buckling caused by folding and subsequent corner wrinkles and cracks; the two-section edge folding assembly is driven by the pressing mechanism, and through vacuum adsorption, it ensures that the first two-section edge is folded along the fold line, avoiding slippage and deflection during the folding process; and it abandons the traditional two-station step-by-step folding mode, and can simultaneously complete the multi-section folding of the cardboard through a single downward action, greatly reducing the longitudinal space occupied by the equipment and the production cycle, and adapting to the needs of high-speed automated production lines.

[0020] It should be understood that the foregoing general description and the following detailed description are exemplary and illustrative only, and are not intended to limit this disclosure.

[0021] This application provides an overview of various implementations or examples of the technology described in this disclosure, and is not a full disclosure of the entire scope or all features of the disclosed technology. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0023] Figure 1 This is a schematic diagram of the overall assembled structure of the present invention;

[0024] Figure 2 This is a frontal structural diagram of the present invention;

[0025] Figure 3 This is a structural diagram highlighting the position of the two-section edge-folded component in this invention;

[0026] Figure 4 This is a structural schematic diagram of the cross-section of the two-segment edge-folding component of the present invention;

[0027] Figure 5 This is a schematic diagram of the cross-section of the first fold of the present invention;

[0028] Figure 6 This is a schematic diagram of the structure of the first folded part of the present invention exploding;

[0029] Figure 7 This is a structural diagram highlighting the position of the folded portion after the two sides of the present invention;

[0030] Figure 8 This is a schematic diagram of the structure of the two-section rear folded part of the present invention from a side view.

[0031] Figure 9 This is a structural schematic diagram of the two-section rear folded part of the present invention viewed from below;

[0032] Figure 10 This is a schematic diagram of the structure of the rear fold of the present invention exploding;

[0033] Figure 11 This is a schematic diagram of the structure of the paperboard of the present invention;

[0034] Figure 12 This is a schematic diagram of the structure of a section of the cardboard of the present invention after folding.

[0035] Explanation of reference numerals in the attached figures:

[0036] In the diagram: 1. Mounting base; 2. Forming mechanism; 21. Forming substrate; 22. Folding frame; 23. Folding tongue frame; 24. Transmission link; 25. Positioning spring rod; 26. Two-section edge folding assembly; 261. Cylinder 1; 262. Piston 1; 263. Push rod 1; 264. Mounting bracket 1; 265. Folding section; 2651. Mounting cage 1; 2652. Transmission shaft 1; 2653. Drive shaft 1; 2654. Folding claw 1; 2655. Vacuum suction cup; 2656. Friction roller 1; 266. Folding transmission part; 2661. Positioning elastic rod; 2662. Drive rod ; 2663, Friction section; 27, Two-section folding assembly; 271, Cylinder II; 272, Piston II; 273, Push rod II; 274, Mounting bracket II; 275, Folding section; 2751, Mounting cage II; 2752, Drive shaft II; 2753, Drive shaft II; 2754, Folding claw II; 2755, Air nozzle; 2756, Friction roller II; 276, Folding drive section; 3, Pressing mechanism; 31, Electric telescopic rod; 32, Pressing plate; 4, Cardboard; 41, Center plate; 42, One-section folding edge; 43, Tongue plate; 44, Two-section folding edge I; 45, Two-section folding edge II. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0038] Please see Figure 1-12 The present invention provides a technical solution: a structure for synchronous folding and forming of a paper box on four sides, including a mounting base 1, and further including: a forming mechanism 2, disposed on the mounting base 1, for receiving and folding the paperboard 4; and a pressing mechanism 3, disposed above the forming mechanism 2, for providing downward pressure for folding and forming the paperboard 4;

[0039] The forming mechanism 2 includes a transmission link 24; a two-section edge folding component 26 and a two-section edge folding component 27, both of which are synchronously driven by the transmission link 24 and are used to perform staged folding of the two-section edge 1 44 and the two-section edge 2 45 of the cardboard 4.

[0040] The two-section edge folding component 26 is configured to operate in three stages: the first stage is to adsorb and fix the first section folding edge 42 corresponding to the two-section folding edge 44; the second stage is to fold the two-section folding edge 44 180°; and the third stage is to maintain the adsorption state of the first section folding edge 42.

[0041] The two-section edge folding assembly 27 is configured to operate in three stages: in the first stage, airflow is sprayed outward to the outside of the two-section edge 2 45 to deflect it outward to avoid interference; in the second stage, the airflow is maintained; and in the third stage, the two-section edge 2 45 is folded 180°.

[0042] The cardboard 4 includes a center plate 41 at the center position; the center plate 41 is connected to a folded edge 42 around its perimeter; two sets of folded edges 42 in opposite positions are connected to a second folded edge 44 on the side away from the center plate 41; and two sets of folded edges 42 in opposite positions are connected to a second folded edge 45 on the side away from the center plate 41; both sides of the two sets of folded edges 42 connected to the second folded edge 44 are connected to tongue plates 43.

[0043] Specifically, the feeding mechanism in the prior art sends the die-cut and pleated cardboard 4 to the bottom of the pressing mechanism 3. The pressing mechanism 3 uses a pneumatic suction cup to adsorb the cardboard 4. The pressing mechanism 3 is driven to move the cardboard 4 down and cooperate with the folding frame 22 and folding tongue frame 23 in the forming mechanism 2 to fold the four sets of first-section folds 42 into place. At this time, the four sets of first-section folds 42, as well as the first and second-section folds 44 and 45, are all in a vertical state. The pressing mechanism 3 is driven to continue to move the entire forming substrate 21 and the half-box structure that has been folded once down. The four sets of transmission linkages 24 are driven by the forming substrate 21 to open synchronously, forming the second section. The movement of the first-folding component 26 and the second-folding component 27 is powered. The pistons in both the first-folding component 26 and the second-folding component 27 operate in three continuous stages. In the first stage, piston 262 in the first-folding component 26 moves along the front end of cylinder 261 and through the air guide pipe and drive shaft 2652 to evacuate the vacuum suction cup 2655. The vacuum suction cup 2655 then adsorbs and fixes the first folding edge 42 at the corresponding position of the second folding edge 44, ensuring precise folding along the fold line during the second folding process. In the second stage, piston 262 begins to push the first-folding component... The moving part 266 actuates and drives the folding claw 2654 to fold the second-section folded edge 44 180°. When the piston in the second-section folding assembly 26 moves into place in the second stage, the folding of the second-section folded edge 44 is completed. In the third stage, the folding transmission part 266 continues to move, but at this time, the folding transmission part 266 does not drive the folding claw 2654 to move. When the piston 272 in the second-section rear folding assembly 27 moves in the first stage, it pushes the gas inside the cylinder 271 into the rear folding part 275 and sprays it vertically along the nozzle 2755. The vertically sprayed airflow flows on the outside of the second-section folded edge 45. Utilizing Bernoulli's principle, the second folded edge 45 is slightly deflected outward to avoid interference when the first folded edge 44 is folded. During the second stage of movement, the second piston 272 continues to inject airflow. During the third stage of movement, the second piston 272 begins to push the rear folding drive 276 to move and drives the folding claw 2754 to fold the second folded edge 45 180°. The rear folding drive 276 in the second folded edge rear folding assembly 27 starts to move one movement stage later than the first folding transmission 266 in the second folded edge front folding assembly 26. The pistons in the second folded edge front folding assembly 26 and the second folded edge rear folding assembly 27 move synchronously.

[0044] Compared with the prior art, the two-section edge folding assembly 27 of the present invention is driven by the pressing mechanism 3. Before the two-section edge folding 44 is folded, the airflow is used to deflect the two-section edge 45 outward, actively avoiding contact between the two-section edge 45 and the corner of the two-section edge 44. This fundamentally solves the problems of inward buckling caused by folding and subsequent corner wrinkles and cracks. The two-section edge folding assembly 26 is driven by the pressing mechanism 3. Through vacuum adsorption, the first edge 42 corresponding to the two-section edge folding 44 is ensured to be folded along the fold line, avoiding slippage and deflection during the folding process. Moreover, it abandons the traditional two-station step-by-step folding mode. The multi-section folding of the cardboard 4 can be completed simultaneously through a single downward movement, which greatly reduces the vertical space occupied by the equipment and the production cycle, and adapts to the needs of high-speed automated production lines.

[0045] As a preferred technical solution in this embodiment, the pressing mechanism 3 includes an electric telescopic rod 31 and a pressing plate 32. The pressing plate 32 is fixedly connected to and driven by the output shaft of the electric telescopic rod 31. The bottom of the pressing plate 32 matches the forming shape of the cardboard 4. Specifically, the pressing plate 32 is provided with a pneumatic suction cup for adsorbing the cardboard 4. In the initial stage, when the cardboard 4 is fed to the bottom of the pressing plate 32, it is adsorbed and positioned by the pneumatic suction cup. The electric telescopic rod 31 drives the pressing plate 32 to move down and cooperates with the folding frame 22 and the folding tongue frame 23 to fold the four sets of first-section folding edges 42 and the tongue plate 43 into place simultaneously. At this time, the four sets of first-section folding edges 42 and the second-section folding edges 44 and 45 are all in a vertical state. The electric telescopic rod 31 continues to drive the pressing plate 32, which can simultaneously drive the forming substrate 21 and the half-box structure that has been folded once to move down, providing power for the subsequent folding of the second-section folding edges 44 and 45.

[0046] As a preferred technical solution of this embodiment, the structure further includes a mounting base 1, and a forming mechanism 2 including a forming substrate 21, the top of which is provided with a folding frame 22 and a folding tongue frame 23 for folding a section of the folded edge 42; the transmission link 24 is hinged to the top of the mounting base 1 and is driven by the forming substrate 21. Specifically, the forming mechanism 2 also includes a positioning spring rod 25, which is disposed at the four corners of the mounting base 1 and is movably connected to the forming substrate 21; the forming substrate 21 is driven to move downward against the elastic force of the positioning spring rod 25, thereby driving the transmission link 24 to move, providing power for the movement of the two-section edge folding component 26 and the two-section edge rear folding component 27. After folding, the positioning spring rod 25 applies an elastic force to the forming substrate 21, which can reset the forming substrate 21 and the transmission link 24; the transmission link 24 corresponds one-to-one with the two-section edge folding component 26 and the two-section edge rear folding component 27. When the forming substrate 21 is driven to move downward, it can press the transmission link 24 to open outward.

[0047] As a preferred technical solution in this embodiment, two sets of two-section edge folding components 26 and two sets of two-section edge folding components 27 are alternately arranged around the perimeter of the molding substrate 21. The two-section edge folding components 26 correspond to the position of the first two-section folding edge 44, and the two-section edge folding components 27 correspond to the position of the second two-section folding edge 45. Specifically, the two-section edge folding components 26 and the two-section edge folding components 27 are compounded on the basis of the folding frame 22 and the folding tongue frame 23. Through the single downward movement of the pressing mechanism 3, the multi-section folding of the cardboard 4 can be completed simultaneously, which greatly reduces the longitudinal space occupied by the equipment and the production cycle. The two-section edge folding components 27 are driven by the pressing mechanism 3. Before the first two-section folding edge 44 is folded, the airflow is used to deflect the second two-section folding edge 45 to the outside, actively avoiding the contact between the second two-section folding edge 45 and the corner of the first two-section folding edge 44. This fundamentally solves the problems of inward buckling caused by folding and subsequent corner wrinkles and cracks.

[0048] It should be noted that during the two-section folding process, the vertical first fold 42 and the two second folds 44 and 45 lack positioning structures. In particular, when the first fold of the second fold 44 is folded first, it may not necessarily fold inward along the fold line. It may bend inward along with the first fold 42, resulting in folding failure. Therefore, a second-section folding component 26 is set up. When the second-section folding component 26 is pressed down by the pressing mechanism 3, the first fold 42 corresponding to the second fold 44 is vacuum-adsorbed, ensuring that the second fold 44 is folded along the fold line, thus avoiding slippage and deflection during the folding process.

[0049] It should also be noted that in this application, when folding the two-section folded edges, the first folded edge 44 is folded first, followed by the second folded edge 45. By using the jet of air to deflect the two sets of second folded edges 45 outward, the interference at the corners during the folding of the first folded edge 44 and the second folded edge 45 can be satisfied without the first folded edge 44 needing to be deflected outward before folding. In addition, by using negative pressure to adsorb the first folded edge 42 corresponding to the first folded edge 44, the first folded edge 44 is prevented from bending inward, ensuring the bending quality of the first folded edge 44. After the first folded edge 44 is folded to the inside of the corresponding first folded edge 42, the folded first folded edge 44 can limit the bending of the first folded edge 42 corresponding to the second folded edge 45 inward, thus ensuring the bending quality of the second folded edge 45.

[0050] In another embodiment of the present invention, the two-section edge pre-folding assembly 26 includes a cylinder 261; a piston 262 movably mounted inside the cylinder 261; a pre-folding portion 265 and a pre-folding transmission portion 266, both disposed on the cylinder 261; the pre-folding portion 265 includes a folding claw 2654 and a vacuum suction cup 2655; when the piston 262 moves, it continuously provides a negative pressure environment for the vacuum suction cup 2655; when the piston 262 moves in the second stage, it drives the folding claw 2654 to move through the pre-folding transmission portion 266. Specifically, the two-section edge pre-folding assembly 26... It also includes a push rod 263, one end of which is fixedly connected to the piston 262, and the other end is hinged to the corresponding transmission link 24. When the transmission link 24 is driven to expand or close, it can drive the piston 262 to move inside the cylinder 261 through the push rod 263. The front end of the cylinder 261 is sealed and the rear end is open. The cylinder 261 is fixedly installed on the bottom of the molding substrate 21 by the mounting bracket 264. The cylinder 261 is provided with a gas guide pipe, one end of which is connected to the front end of the cylinder 261, and the other end is connected to the gas passage inside the transmission shaft 2652.

[0051] As a preferred embodiment, the pre-folding transmission unit 266 includes a friction section 2663 for driving the pre-folding part 265. The front end of the pre-folding transmission unit 266 is located at the initial position of the piston 262 in the second stage. Specifically, the position of the front end of the friction section 2663 is restricted to ensure that before the friction section 2663 starts to move, that is, before the second-section folding edge 44 starts to fold, the piston 262 can provide a negative pressure environment for the vacuum suction cup 2655, so that the vacuum suction cup 2655 can fold the first section of the second-section folding edge 44 corresponding to the first section folding edge 44. 2. Negative pressure adsorption is performed; the first-folding transmission part 266 includes a positioning elastic rod 2661, which is movably installed inside the cylinder 261; a drive rod 2662, which is fixedly connected to the positioning elastic rod 2661; a friction section 2663 is opened at one end of the drive rod 2662 near the first-folding part 265. When the drive rod 2662 is driven to move, the friction section 2663 can drive the friction roller 2656 and the transmission shaft 2652 to rotate through friction; the effective length of the friction section 2663 is the movement distance of the piston 262 in the second stage.

[0052] As a preferred embodiment, the folding section 265 includes a mounting cage 2651; a transmission shaft 2652 and a drive shaft 2653, both rotatably mounted on the mounting cage 2651; a folding claw 2654 fixedly mounted on the drive shaft 2653; and a vacuum suction cup 2655 fixedly connected to the top of the mounting cage 2651. The vacuum suction cup 2655 is connected to the front end of the cylinder 261 through an air passage in the transmission shaft 2652 and an air guide pipe. Specifically, the mounting cage 2651 is fixedly mounted on the molding base. The top of plate 21; the drive shaft 2652 is vertically mounted on the mounting cage 2651, and its bottom end is inserted into the inside of the cylinder 261 and fixedly fitted with the friction roller 2656; the drive shaft 2653 is horizontally mounted on the mounting cage 2651, and the drive shaft 2652 and the drive shaft 2653 are connected by a bevel gear; when the friction roller 2656 is driven to drive the drive shaft 2652 to rotate, it drives the drive shaft 2653 to rotate through the bevel gear, which in turn drives the folding claw 26. 54 deflection achieves folding of the two-section folded edge 44; the transmission shaft 2652 has an air passage with an open top that cooperates with the air guide pipe; the top of the mounting cage 2651 is provided with a sealed chamber that cooperates with the vacuum suction cup 2655; the vacuum suction cup 2655 is located on the inner side of the top of the mounting cage 2651; in the initial state, the opening of the vacuum suction cup 2655 can abut against the first folded edge 42, which is connected to the two-section folded edge 44 and is in a vertical state; the folding claw 2654 has an overall L shape, and its short side is vertical in the initial state; transmission Positioning blocks that cooperate with each other are provided on the shaft 2652 and the inner wall of the cylinder 261 to limit the initial position of the drive shaft 2652 and the folding claw 2654. When the piston 262 moves in the first stage, it draws a vacuum on the vacuum suction cup 2655 along the front end of the cylinder 261 and through the air passage in the air guide pipe and the drive shaft 2652. The vacuum suction cup 2655 adsorbs and fixes the first folding edge 42 at the corresponding position of the second folding edge 44, so that the second folding edge 44 can be folded accurately along the fold line when folding.

[0053] In another embodiment of the present invention, the two-section rear-folding assembly 27 includes a cylinder 271; a piston 272 movably mounted inside the cylinder 271; a rear-folding portion 275 and a rear-folding drive portion 276, both disposed on the cylinder 271; the rear-folding portion 275 includes a folding claw 2754 and a jet nozzle 2755; the piston 272 provides jet airflow to the jet nozzle 2755 in both the first and second stages; when the piston 272 moves in the third stage, it drives the folding claw 2754 to move through the rear-folding drive portion 276. Specifically, the two-section rear-folding assembly 27 also includes a push rod 273, one end of which is fixedly connected to the piston 272, and the other end is hinged to a transmission link 24 at a corresponding position. The transmission link 24 is driven... During expansion or closure, the piston 272 can be moved inside the cylinder 271 by the push rod 273; the front end of the cylinder 271 is in an open state and the rear end is in a sealed state; the cylinder 271 is fixedly installed on the bottom of the molding substrate 21 by the mounting bracket 274; when the piston 272 moves in the first stage, it pushes the gas inside the cylinder 271 into the rear fold 275 and sprays it vertically along the jet nozzle 2755. The vertically sprayed airflow flows outside the second fold edge 45. Utilizing Bernoulli's principle, that is, before the second fold edge 44 is folded, the airflow is used to deflect the second fold edge 45 to the outside, actively avoiding contact between the second fold edge 45 and the corner of the second fold edge 44; when the piston 272 moves in the second stage, the airflow injection continues.

[0054] As a preferred technical solution in this embodiment, the front end of the rear folding drive unit 276 is located at the initial position of the third stage of the piston 272. The difference between the rear folding drive unit 276 and the first folding transmission unit 266 is that the front end is in a different position. That is, the action of the rear folding drive unit 276 is delayed by one working stage of the first folding transmission unit 266, so that the two-section folding edge 1 44 and the two-section folding edge 2 45 can be folded one after the other to avoid interference. The effective distance of the rear folding drive unit 276 driving the rear folding part 275 is the moving distance of the piston 272 in the third stage.

[0055] As a preferred embodiment, the rear folding portion 275 includes a second mounting cage 2751; a second transmission shaft 2752 and a second drive shaft 2753, both rotatably mounted on the second mounting cage 2751; a second folding claw 2754 fixedly mounted on the first drive shaft 2653; and an air nozzle 2755 fixedly connected to the second folding claw 2754. The air nozzle 2755 communicates with the inside of the second cylinder 271 via the second transmission shaft 2752. Specifically, the difference between the rear folding portion 275 and the first folding portion 265 is that the contact position between the second transmission shaft 2752 and the second cylinder 271 is rotary sealed; the air passage in the second transmission shaft 2752 is open at both ends; and the air nozzle 2755 is fixedly mounted on the short side of the second folding claw 2754. The interior of piston 2753 and folding claw 2754 is provided with an air passage that cooperates with the jet nozzle 2755. When piston 272 is driven, the gas in cylinder 271 can be guided into the jet nozzle 2755 through the air passage in drive shaft 2752 and the air passage in drive shaft 2753 and folding claw 2754. The gas is then ejected vertically through the jet nozzle 2755, so that before the second folding edge 44 is folded, the airflow causes the second folding edge 45 to deflect outward, actively avoiding contact between the second folding edge 45 and the corner of the second folding edge 44. It should be noted that when piston 272 returns to the initial state, a one-way intake valve is provided at the rear end of cylinder 271 in order to allow the cylinder 271 to quickly intake air.

[0056] All electrical components involved in this application are existing technologies. Those skilled in the art can select appropriate models of electrical components according to their needs. No restrictions or elaborations are made here. Those skilled in the art understand their connection methods. With the help of those skilled in the art, all electrical components in this application and their compatible power supplies can be connected by wires. And according to the actual situation, appropriate controllers can be selected to meet control requirements.

[0057] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A structure for synchronous folding and forming of four sides of a paper box, comprising a mounting base (1), characterized in that, Also includes: A forming mechanism (2) is disposed on the mounting base (1) for receiving and folding the cardboard (4); a pressing mechanism (3) is disposed above the forming mechanism (2) for providing downward pressure for folding the cardboard (4); The forming mechanism (2) includes a transmission link (24); a two-section edge folding component (26) and a two-section edge folding component (27), both of which are synchronously driven by the transmission link (24) and are used to perform phased folding of the two-section folding edge one (44) and the two-section folding edge two (45) of the cardboard (4); The two-segment folding component (26) is configured to work in three stages; in the first stage, it adsorbs and fixes the first fold (42) corresponding to the first fold (44) of the two-segment folding component (44); in the second stage, it folds the first fold (44) of the two-segment folding component (44) by 180°; and in the third stage, it maintains the adsorption state of the first fold (42). The two-section folding assembly (27) is configured to operate in three stages: in the first stage, airflow is sprayed outward to the outside of the two-section folding edge (45) to deflect it outward to avoid interference; in the second stage, the airflow is maintained; and in the third stage, the two-section folding edge (45) is folded 180°.

2. The structure for synchronous folding and forming of a paper box on four sides according to claim 1, characterized in that, The pressing mechanism (3) includes an electric telescopic rod (31) and a pressing plate (32). The pressing plate (32) is fixedly connected to and driven by the output shaft of the electric telescopic rod (31). The bottom of the pressing plate (32) matches the forming shape of the cardboard (4).

3. The structure for synchronous folding and forming of a paper box on four sides according to claim 1, characterized in that, The structure also includes a mounting base (1), and the forming mechanism (2) includes a forming substrate (21), which is provided with a folding frame (22) and a folding tongue frame (23) on its top for folding a section of folded edge (42) into shape; the transmission link (24) is hinged to the top of the mounting base (1) and is driven by the forming substrate (21).

4. The structure for synchronous folding and forming of a paper box on four sides according to claim 3, characterized in that, Two sets of two-segment edge-first folding components (26) and two sets of two-segment edge-back folding components (27) are alternately arranged around the molded substrate (21). The two-segment edge-first folding component (26) corresponds to the position of the first two-segment folding edge (44), and the two-segment edge-back folding component (27) corresponds to the position of the second two-segment folding edge (45).

5. The structure for synchronous folding and forming of a paper box on four sides according to claim 1, characterized in that, The two-section edge-folding assembly (26) includes a cylinder (261); a piston (262) which is movably installed inside the cylinder (261); a folding part (265) and a folding transmission part (266), both of which are disposed on the cylinder (261); the folding part (265) includes a folding claw (2654) and a vacuum suction cup (2655); when the piston (262) moves, it continuously provides a negative pressure environment for the vacuum suction cup (2655); when the piston (262) moves in the second stage, it drives the folding claw (2654) to move through the folding transmission part (266).

6. A structure for synchronous folding and forming of a paper box on four sides according to claim 5, characterized in that, The pre-folding drive unit (266) includes a friction section (2663) for driving the pre-folding part (265), and the front end of the pre-folding drive unit (266) is located at the initial position of the second stage of the piston (262).

7. A structure for synchronous folding and forming of a paper box on four sides according to claim 5, characterized in that, The first folding part (265) includes a first mounting cage (2651); a first transmission shaft (2652) and a first drive shaft (2653), both of which are rotatably mounted on the first mounting cage (2651); a first folding claw (2654) is fixedly fitted on the first drive shaft (2653); a vacuum suction cup (2655) is fixedly connected to the top of the first mounting cage (2651); the vacuum suction cup (2655) is connected to the front end of the first cylinder (261) through the air passage in the first transmission shaft (2652) and the air guide pipe.

8. A structure for synchronous folding and forming of a paper box on four sides according to claim 1, characterized in that, The two-section rear-folding assembly (27) includes a cylinder two (271); a piston two (272), which is movably installed inside the cylinder two (271); a rear-folding part (275) and a rear-folding drive part (276), both of which are disposed on the cylinder two (271); the rear-folding part (275) includes a folding claw two (2754) and a jet nozzle (2755); the first stage and the second stage of the piston two (272) provide jet airflow to the jet nozzle (2755); when the piston two (272) moves in the third stage, it drives the folding claw two (2754) to move through the rear-folding drive part (276).

9. A structure for synchronous folding and forming of a paper box on four sides according to claim 8, characterized in that, The front end of the rear-folding drive unit (276) is located at the initial position of the third stage of the piston (272).

10. A structure for synchronous folding and forming of a paper box on four sides according to claim 8, characterized in that, The rear folding part (275) includes a second mounting cage (2751); a second transmission shaft (2752) and a second drive shaft (2753), both of which are rotatably mounted on the second mounting cage (2751); a second folding claw (2754) is fixedly mounted on the first drive shaft (2653); and a jet nozzle (2755) is fixedly connected to the second folding claw (2754); the jet nozzle (2755) is connected to the inside of the second cylinder (271) through the second transmission shaft (2752).

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