A glue-free integrated forming device and process for a paper packaging box

Abstract

The application discloses a paper packaging box glue-free integrated forming equipment and process, wherein rotatable negative pressure plates and side suction plates are arranged on four sides of a male die, so that when the male die rotates to a set position above a paperboard, the negative pressure plates can be pressed on a to-be-formed surface of the paperboard to perform adsorption, and the side suction plates can adsorb one side of a to-be-pressed part of the paperboard to an inclined surface; at this time, the male die continues to rotate to leave the position, and the negative pressure plates and the side suction plates can synchronously rotate to serve as female dies, drive the adsorbed paperboard to be attached to four side walls of the male die, complete a closing operation of the carton, and avoid a rigid collision structure of existing rigid male dies and female dies, which can cause crushing and damage of a corrugated core of the corrugated paperboard in a pressing process and affect the overall strength of the carton.

Description

Technical Field

[0001] This application relates to the field of paper packaging forming technology, and in particular to a glue-free integrated forming equipment and process for paper packaging boxes. Background Technology

[0002] As the most widely used packaging container in the packaging industry, the environmental friendliness, efficiency, and connection strength of cardboard box forming processes directly affect packaging costs, product safety, and market competitiveness. Currently, traditional cardboard box forming mainly relies on two methods: chemical adhesive bonding or metal nail fixing, with chemical adhesive bonding being the mainstream process.

[0003] When using chemical adhesives, the adhesive must be pre-applied to the areas of the cartons to be joined, and then the boxes are pressed together using a mold and cured at room temperature or by heating to achieve bonding. This process has several inherent drawbacks: Firstly, chemical adhesives contain volatile harmful substances, which not only pollute the environment but may also cause secondary pollution to packaged food, pharmaceutical, and other products, contradicting the current trend of green and environmentally friendly industrial development. Secondly, the adhesive requires a certain curing time after application, resulting in low forming efficiency, and the amount of adhesive applied is difficult to control precisely, easily leading to problems such as glue overflow and delamination, affecting the appearance and connection strength of the cartons.

[0004] To address environmental concerns, the industry is exploring the use of natural plant fiber-based materials (such as corn starch-based materials) to replace traditional chemical adhesives. These materials leverage their biodegradability and pollution-free properties to achieve environmentally friendly bonding of cardboard boxes. To improve the flowability of natural plant fiber-based materials, liquids are added to create low-viscosity suspensions. However, conventional coating processes still struggle to achieve precise and uniform localized coating. Furthermore, activation and molding require specific temperatures and energy triggers. Traditional heating methods (such as hot air and infrared) are inefficient and result in uneven heat distribution, easily leading to cardboard carbonization and damage. Instant activation and compression molding are also difficult to achieve, making them unsuitable for high-speed production lines.

[0005] Therefore, in terms of carton forming equipment, the cardboard is first cut, creases are pressed out, and then coating is applied. Then, a rigid punch and a rigid die are used to press the cardboard into a carton. This rigid collision structure is prone to crushing and damaging the corrugated core of the cardboard during the pressing process, affecting the overall strength of the carton. After pressing, an ejection operation is required to push out the carton that is stuck in the die before it is transferred. Multiple auxiliary equipment are needed, resulting in a complicated structure and a large space occupation. Summary of the Invention

[0006] This application proposes an integrated glue-free molding equipment for paper packaging boxes, which has the advantages of ensuring glue-free production, stable molding, less prone to crushing of cardboard, precise coating, and adaptability to high-speed continuous production. It solves the problems of traditional glues, such as high pollution, slow curing, easy damage to corrugated cores by rigid molding, uneven coating, and cumbersome molding process.

[0007] To achieve the above objectives, this application adopts the following technical solution: a glue-free integrated molding device for paper packaging boxes, including a motor base, a shelf at the output end of the motor base, a plurality of circumferentially distributed rotating connecting rods at the bottom end of the shelf, and a hydraulic base on the side of the rotating connecting rods away from the shelf; The output end of the hydraulic base is provided with a connecting sleeve, and the bottom end of the connecting sleeve is provided with a punch; The punch is provided with a hydraulic sleeve, which includes an inner tube and an outer tube. The bottom of the hydraulic sleeve is provided with four circumferentially distributed reversing tubes that are connected to the inner tube. A transmission hydraulic cylinder is provided on the side of the reversing tube away from the inner tube. A transmission hydraulic rod is provided inside the transmission hydraulic cylinder. The outer end of the transmission hydraulic rod is sequentially hinged to a hinged connecting rod I and a hinged connecting rod II. The ends of the two opposing transmission hydraulic cylinders near the reversing tube are closed to form a return hydraulic cylinder. The punch has side sealing plates on its four sides, and the adjacent ends of the side sealing plates form a 90-degree angle and a pressing area. Two opposite side sealing plates are provided with long rods at their bottoms, and two other opposite side sealing plates are provided with short rods at their bottoms. The long rods and short rods are respectively hinged to the end of the adjacent hinge link II that is away from the hinge link I. Both the long rod and the short rod are provided with two symmetrical negative pressure plates, and the negative pressure plates have cavities inside and multiple openings at the bottom. The long rod is provided with side suction plates at both ends. The side suction plates are located in the pressing area. An inclined surface is opened on the side of the side suction plate away from the negative pressure plate. A cavity is opened in the side suction plate. Multiple downward inclined openings are opened on the inclined surface. The short rod has a coating device on one side of the negative pressure plate, including a variable tube, an extension tube on the side of the variable tube away from the negative pressure plate, a sealing plate at the end of the extension tube, an L-shaped conveying tube inside the extension tube and through the sealing plate, and a coating plate at the outer end of the conveying tube.

[0008] Preferably, the punch includes a mounting base at the top and a base plate at the bottom of the mounting base. The punch has a limiting groove and a movable groove. Multiple recessed grooves are formed on the four sides of the punch. Air pipes are provided in the recessed grooves, and raw material pipes are provided in the two recessed grooves on one side of the short rod.

[0009] Preferably, the bottom center of the side sealing plate is provided with an expansion groove communicating with the movable groove on the side facing the punch. The hinged connecting rod II and hinged connecting rod I are located in the movable groove and the expansion groove. The side sealing plate is provided with multiple vertical grooves. The middle part of the side sealing plate on the side of the short rod is provided with two symmetrical horizontal grooves. The thickness of the side sealing plate on this side near the pressing area is less than the thickness of other parts.

[0010] Preferably, the variable tube is provided with piston I, and spring I is provided on the side of piston I away from the extension tube. A top post is provided on the other side of piston I. The extension tube is provided with piston II, and spring II is provided on the side of piston II away from the top post. One end of the conveying tube is fixedly inserted through piston II, and a one-way valve is provided in this end. The diameter of the top post is equal to the inner diameter of the conveying tube.

[0011] Preferably, a positive pressure cavity is formed between piston II and the sealing plate, a liquid storage cavity is formed between piston I and piston II, the liquid storage cavity is filled with liquid natural plant fiber raw material, an extension cavity is formed on the side of piston I away from the liquid storage cavity, a manifold cavity is opened in the coating plate and connected to the delivery pipe, and a slit is opened on the side of the coating plate away from the negative pressure plate and connected to the manifold cavity.

[0012] Preferably, the variable tube is provided with a limiting ring I located between piston I and piston II, and the extended tube is provided with a limiting ring II located between the sealing plate and piston II.

[0013] Preferably, the bottom of the outer tube has four circumferentially distributed interfaces I; the side of the transmission hydraulic cylinder away from the reversing pipe has an interface II connected to interface I; the side of the return hydraulic cylinder near the reversing pipe has an interface III; the top of the negative pressure plate near the punch has an interface IV fixedly connected to the air pipe; the long rod has an inner cavity connected to the cavity of the side suction plate; the long rod has an interface V connected to the air pipe; the extension tube near the sealing plate has an interface VI connected to interface III; the middle of the variable tube has an interface VII; the interface VII has a one-way valve II; and the interface VII is connected to the raw material pipe.

[0014] Preferably, the hydraulic base is provided with T-shaped mounting plates on both sides, and heating hydraulic cylinders are provided on both sides of the mounting plates. Heating hydraulic rods are provided inside the heating hydraulic cylinders, and ultrasonic heating components are provided at the bottom end of the heating hydraulic rods. The ultrasonic heating components are located above the pressing area.

[0015] Preferably, the ultrasonic heating assembly includes an ultrasonic generator, a transducer, an amplitude transformer, and a welding head in the shape of a straight plate.

[0016] A glue-free integrated molding process for paper packaging boxes, applied to glue-free integrated molding equipment, includes the following steps: S1. The motor base drives the punch to rotate circumferentially through the rotating connecting rod. When it rotates to above the cardboard that has been cut and folded, the hydraulic base drives the punch to move down and abut against the cardboard. S2. The cavity of the negative pressure plate forms a negative pressure through the connected air pipe, which adsorbs the surface of the box. S3. The cavity of the side suction plate forms a negative pressure through the connected air pipe, which adsorbs the surface of the box to be glued. S4. The hydraulic base drives the punch to rise. At this time, the motor base drives the punch to move circumferentially. During this process, the hydraulic oil in the transmission hydraulic cylinder pushes the transmission hydraulic rod in the opposite direction to move towards the reversing tube, and drives the hinged connecting rod I and hinged connecting rod II to pull the long rod to rotate. This causes the negative pressure plate and side suction plate connected to the long rod to move closer to the side wall of the punch, and causes the adsorption box surface to deflect. S5. The hydraulic oil in the return hydraulic cylinder pushes the transmission hydraulic rod in the opposite direction to the reversing pipe, and drives the hinged connecting rod I and hinged connecting rod II to pull the short rod to rotate, which drives the negative pressure plate and coating plate connected to the short rod to move closer to the side wall of the punch, and causes the adsorbed box surface to deflect. S6. The hydraulic oil in the return hydraulic cylinder is pressed into the positive pressure chamber, squeezing piston II and driving the coating plate to move towards the negative pressure plate through the conveying pipe. Piston II squeezes the liquid raw material in the storage chamber, opens the one-way valve, and allows the liquid natural plant fiber raw material to be pressed into the manifold through the conveying pipe and squeezed out from the slit to be evenly coated on the box surface. S7. After the punch reaches the next station, the next punch following up reaches the cardboard. At this time, the carton on this punch is closed. The side suction plate starts to spray air to push the adsorbed box surface to adhere to the coating area, and moves down to start the ultrasonic heating component to perform ultrasonic heating and bonding on this box surface. Then the ultrasonic heating component moves up. S8. The punch continues to rotate. After reaching the next station, the negative pressure plate switches to air blowing, causing the formed carton to fall off.

[0017] This application provides a glue-free integrated molding device for paper packaging boxes. By setting rotatable negative pressure plates and side suction plates on the four sides of the punch, when the punch rotates to a set position above the cardboard, the negative pressure plates can press against the surface of the cardboard to be formed for adsorption, and the side suction plates can adsorb one side of the cardboard to be pressed onto the inclined surface. At this time, the punch continues to rotate away from this position, while the negative pressure plates and side suction plates can rotate synchronously, acting as "concave molds", driving the adsorbed cardboard to adhere to the four side walls of the punch, completing the carton closing operation. This avoids the rigid collision structure of existing rigid punches and concave molds, which can crush and damage the corrugated core of the corrugated cardboard during the pressing process, affecting the overall strength of the carton.

[0018] Simultaneously, as the coating plate rotates and approaches the punch, the hydraulic oil in the return hydraulic cylinder can be pressed into the pressurization chamber of the extension tube, pushing piston II forward to squeeze the material in the storage chamber. This causes the material to open the one-way valve, be sent into the manifold through the conveying pipe, and then be squeezed out through the slit to the area to be coated on the cardboard. The conveying pipe will also drive the coating plate to move synchronously with piston II, causing the position of the slit to move continuously to the same side. This allows the coating position of the material to move in the same direction as the slit, completing the coating of all areas to be coated.

[0019] Meanwhile, when piston II moves to the set position, the one-way valve will be blocked by the top column. At this time, piston II continues to move, squeezing the material and pushing piston I to move in the same direction. This allows piston II to continue moving away from the coating area while not squeezing the material out of the slit. As a result, after the cardboard is closed, the coating plate away from the cardboard will not obstruct the bonding of the part to be pressed on the side suction plate with the coating area. At this time, the side suction plate changes from negative pressure to positive pressure, blowing the cardboard part on the inclined surface to bond with the coating area, and moving the welding plate in the ultrasonic heating assembly down to this position for rapid ultrasonic heating and pressing. Attached Figure Description

[0020] The accompanying drawings, which form part of this specification, illustrate embodiments disclosed in this application and, together with the specification, serve to explain the principles disclosed in this application.

[0021] This disclosure will become clearer with reference to the accompanying drawings and the following detailed description, wherein: Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram showing the structural position of the ultrasonic heating component of the present invention; Figure 3 This is a schematic diagram of the structural distribution of the present invention; Figure 4 This is a schematic diagram of the internal structure distribution of the punch in this invention; Figure 5 This is a schematic diagram of the base plate structure of the present invention; Figure 6 This is a schematic diagram of the mounting base structure of the present invention; Figure 7 This is a schematic diagram showing the position of the side suction plate structure of the present invention; Figure 8 This is a schematic diagram showing the position of the coating plate structure of the present invention; Figure 9 This is a schematic diagram of the internal flow channels of the coating plate of the present invention; Figure 10 This is a schematic diagram of the internal structure of the variable tube of the present invention; Figure 11 This is a schematic diagram of the motor mount structure of the present invention.

[0022] The components include: 1. Hydraulic base; 11. Mounting plate; 12. Heating hydraulic cylinder; 13. Ultrasonic heating assembly; 2. Connecting sleeve; 21. Hydraulic sleeve; 22. Reversing pipe; 23. Transmission hydraulic cylinder; 231. Return hydraulic cylinder; 24. Transmission hydraulic rod; 25. Hinge connecting rod I; 26. Hinge connecting rod II; 27. Long rod; 28. Short rod; 3. Mounting base; 31. Base plate; 32. Limiting groove; 33. Movable groove; 34. Recessed groove; 4. Air pipe; 41. 5. Raw material pipe; 6. Negative pressure plate; 7. Side suction plate; 8. Inclined surface; 9. Coating plate; 10. Manifold; 11. Slit; 12. Variable pipe; 13. Extended pipe; 24. Sealing plate; 35. Piston I; 46. Top column; 57. Spring I; 68. Piston II; 79. Spring II; 80. Conveying pipe; 11. Limiting ring I; 12. Limiting ring II; 13. Side sealing plate; 24. Vertical groove; 35. Horizontal groove; 16. Motor base; 27. Storage plate; 38. Rotating connecting rod. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0024] Example 1 Please see Figures 1 to 2 A glue-free integrated molding equipment for paper packaging boxes includes a hydraulic base 1. A connecting sleeve 2 is fixedly connected to the bottom output end of the hydraulic base 1. Multiple openings are provided on the side wall of the connecting sleeve 2, so that when the hydraulic sleeve 21 is connected to an external hydraulic transmission device, sufficient space can be provided for the passage of the pipeline.

[0025] See Figures 1 to 6 The bottom end of the connecting sleeve 2 is bolted with a punch. The punch includes an upper mounting base 3 and a base plate 31 bolted to the bottom end of the mounting base 3, so that the punch can be separated at the connection between the base plate 31 and the mounting base 3, which facilitates the installation and disassembly of the internal structure.

[0026] A cross-shaped limiting groove 32 is provided between the opposite ends of the mounting base 3 and the base plate 31, and a movable groove 33 is provided at the center of the four sides of the opposite ends of the mounting base 3 and the base plate 31.

[0027] A hydraulic sleeve 21 is fixedly connected to the center of the mounting base 3. The hydraulic sleeve 21 is composed of two concentric hollow tubes connected together, which are divided into an inner tube and an outer tube that is sleeved outside the inner tube. The top end of the hydraulic sleeve 21 is connected to an existing hydraulic transmission device, and different hoses are set to connect to the inner cavity of the inner tube and the space between the inner tube and the outer tube respectively, so that the inner cavity of the inner tube and the space between the inner tube and the outer tube can form two separate flow channels, thereby forming two reverse flow channels for hydraulic oil.

[0028] The bottom of the hydraulic sleeve 21 is fixedly connected to four circumferentially distributed reversing pipes 22. One end of the reversing pipe 22 is fixedly connected to the inner cavity of the inner tube, so that the input hydraulic oil can enter the reversing pipe 22 through the inner cavity of the inner tube.

[0029] The end of the reversing pipe 22 away from the hydraulic sleeve 21 is fixedly connected to a transmission hydraulic cylinder 23 by bolts. A transmission hydraulic rod 24 is movably sleeved inside the transmission hydraulic cylinder 23. A hinged connecting rod I 25 is hinged to the end of the transmission hydraulic rod 24 away from the transmission hydraulic cylinder 23, and a hinged connecting rod II 26 is hinged to the end of the hinged connecting rod I 25 away from the transmission hydraulic rod 24. This allows the hydraulic oil input into the transmission hydraulic cylinder 23 through the reversing pipe 22 to push the transmission hydraulic rod 24, causing the hinged connecting rod I 25 and the hinged connecting rod II 26 to move away from the reversing pipe 22. When the hydraulic oil flows in the opposite direction, the transmission hydraulic rod 24 can cause the hinged connecting rod I 25 and the hinged connecting rod II 26 to move closer to the reversing pipe 22.

[0030] Four circumferentially distributed interfaces I are fixedly connected to the bottom outer side of the hydraulic sleeve 21. Interface I is connected to the space between the inner and outer tubes of the hydraulic sleeve 21. Interface II is fixedly connected to the side of the transmission hydraulic cylinder 23 away from the hydraulic sleeve 21. A hose is fixedly connected between the adjacent interfaces I and interfaces II.

[0031] When hydraulic oil is input through the inner pipe, it pushes the transmission hydraulic rod 24 to move away from the reversing pipe 22. At this time, the transmission hydraulic rod 24 can push the hydraulic oil in the forward direction to be discharged into the space between the outer and inner pipes through interface II and interface I. When the transmission hydraulic rod 24 needs to move in the opposite direction, the hydraulic oil will be input from the space between the outer and inner pipes through interface II and interface I to the side of the transmission hydraulic cylinder 23 away from the reversing pipe 22, so that the transmission hydraulic rod 24 moves towards the reversing pipe 22 and pushes the hydraulic oil in the forward direction into the inner cavity of the inner pipe.

[0032] Two opposing transmission hydraulic cylinders 23 are closed at one end near the reversing pipe 22 to form a return hydraulic cylinder 231, and an interface Ⅲ is fixedly connected to the outside of this side, so that the hydraulic oil in the reversing pipe 22 cannot enter the return hydraulic cylinder 231, and the hydraulic oil in the return hydraulic cylinder 231 will not enter the reversing pipe 22.

[0033] See Figure 1 The four sides of the punch are fixedly connected with side sealing plates 8 by bolts. The near ends of two adjacent side sealing plates 8 form a 90-degree angle, and a pressing area is formed at the angle, so that when the cartons are combined, the parts of the cartons to be glued can be pressed in the pressing area, and the pressing area can provide sufficient space.

[0034] See Figures 3 to 4 Two opposite side sealing plates 8 are movably fitted with long rods 27 at their bottoms, and two other opposite side sealing plates 8 are movably fitted with short rods 28 at their bottoms.

[0035] Long rod 27 and short rod 28 are respectively hinged to the end of the nearby hinged link II 26 away from hinged link I 25. When the transmission hydraulic rod 24 drives the hinged link I 25 and hinged link II 26 to move away from the reversing pipe 22, the horizontal displacement of long rod 27 and short rod 28 is restricted by the side sealing plate 8. As a result, long rod 27 and short rod 28 can only dissipate the forward force of the transmission hydraulic rod 24 by rotating. At this time, hinged link I 25 and hinged link II 26 will be pushed up, causing long rod 27 and short rod 28 to rotate in the upward direction. When the transmission hydraulic rod 24 drives the hinged link I 25 and hinged link II 26 to move closer to the reversing pipe 22, hinged link I 25 and hinged link II 26 will be pulled down, causing long rod 27 and short rod 28 to rotate in the downward direction.

[0036] An expansion groove communicating with the movable groove 33 is provided on the bottom center of the side sealing plate 8, which is directly opposite the punch. The hinged connecting rod II 26 and hinged connecting rod I 25 are located in the movable groove 33 and the expansion groove, so that the reciprocating motion of the hinged connecting rod I 25 and hinged connecting rod II 26 has sufficient room for movement.

[0037] See Figure 1 , Figures 3 to 4 , Figure 7 Two symmetrical negative pressure plates 5 are fixedly sleeved on both the long rod 27 and the short rod 28. A cavity is opened inside the negative pressure plate 5. The bottom end of the negative pressure plate 5 has evenly distributed openings that communicate with the cavity. An interface IV is fixedly connected to the top of the negative pressure plate 5 near the punch.

[0038] Multiple recessed grooves 34 are provided on the four sides of the punch. Air pipes 4 are fixedly connected in the recessed grooves 34. The bottom end of the air pipe 4 closest to the punch is provided with a flexible hose and fixedly connected to the interface IV. When the long rod 27 and the short rod 28 rotate in the upward direction following the lifting direction of the hinged connecting rod I 25 and the hinged connecting rod II 26, they can drive the negative pressure plate 5 to rotate downward to a horizontal state. At this time, the opening at the bottom of the negative pressure plate 5 will fit with the folding surface of the carton. The air pipe 4 will form a negative pressure under the operation of the external negative pressure pump, adsorbing the carton surface. When the long rod 27 and the short rod 28 rotate, the negative pressure plate 5 can drive the adsorbed carton surface to rotate synchronously, so that the carton surface is lifted and gradually fits the outer side wall of the side sealing plate 8.

[0039] The short rod 28 has two recessed grooves 34 on one side that are fixedly connected to a raw material tube 41. The bottom end of the raw material tube 41 is equipped with a flexible tube. The raw material tube 41 is connected to a material source, so that the adhesive material (a heat-fusible natural plant fiber layer, such as corn starch base) can be continuously replenished into the raw material tube 41.

[0040] Multiple vertical slots 81 are provided on the side sealing plate 8. The negative pressure plate 5 is movably fitted into the adjacent vertical slot 81, so that when the negative pressure plate 5 rotates from the horizontal state to approach the side sealing plate 8, it can enter the vertical slot 81 to complete the storage. The box surface lifted by the negative pressure plate 5 can fit against the outer wall of the side sealing plate 8, thereby forming a vertical surface, which is more in line with the vertical side state of the carton forming.

[0041] The two ends of the long rod 27 extend out of the two ends of the side sealing plate 8, and the two ends of the long rod 27 are fixedly sleeved with side suction plates 51, which are located in the pressing area.

[0042] An inclined surface 52 is provided on the side of the side suction plate 51 away from the negative pressure plate 5. The inclination angle of the inclined surface 52 is no more than 150 degrees. A cavity is provided inside the side suction plate 51. An evenly distributed opening is provided on the inclined surface 52 to communicate with the cavity, and the opening is inclined downward.

[0043] When the side suction plate 51 is in a horizontal state, the bottom end of the inclined surface 52 is on the outer side of the bottom end of the side sealing plate 8, which is close to the side of the short rod 28 in the horizontal direction.

[0044] The long rod 27 has an inner cavity that connects to the cavity of the side suction plate 51. An interface V is fixedly connected to the outer side of the long rod 27 near the side suction plate 51. A flexible tube is provided on the interface V and fixedly connected to the bottom end of the nearby air pipe 4. The interface V is located in the nearby vertical groove 81, so that the interface V will not be obstructed during the rotation of the long rod 27. The air pipe 4 can form a negative pressure in the side suction plate 51 through the interface V, so that the inclined opening on the inclined surface 52 can form a negative pressure, adsorbing the part of the box surface to be bonded onto the inclined surface 52. The existence of the inclined surface 52 ensures that when the side suction plate 51 rotates back into the pressing area, the part to be bonded adsorbed by the inclined surface 52 will not directly contact the part to be coated by the coating plate 53, leaving enough time and space for the coating plate 53 to coat.

[0045] The air tube 4 is connected to an existing reversing valve, which connects the negative pressure pump and the positive pressure air source. When the side suction plate 51 needs to adsorb the part to be adhered, the reversing valve can connect to the negative pressure pump, causing a negative pressure to be formed inside the side suction plate 51. After the coating is completed, when the part to be adhered needs to be adhered to the coated part, the reversing valve can connect to the positive pressure air source, causing the side suction plate 51 to spray air outward, pushing the part to be adhered to the coated part to adhere.

[0046] See Figure 1 , Figures 3 to 4 , Figures 8 to 10 A variable tube 6 is bolted to one side of the negative pressure plate 5 on the short rod 28. An extension tube 61 is bolted to the side of the variable tube 6 away from the negative pressure plate 5. A sealing plate 62 with a central opening is bolted to the end of the extension tube 61 away from the variable tube 6.

[0047] A limiting ring II 71 is fixedly sleeved inside the extension tube 61, and a piston II 66 is movably sleeved inside the extension tube 61. The limiting ring II 71 is located between the sealing plate 62 and the piston II 66, so that when the piston II 66 moves towards the sealing plate 62, it is blocked by the limiting ring II 71 and can only make limited displacement, thus avoiding excessive displacement of the piston II 66, which would cause the connected coating plate 53 to move away from the carton surface.

[0048] A positive pressure chamber is formed between piston II 66 and sealing plate 62.

[0049] A spring II 67 is fixedly connected to one end of piston II 66 facing the sealing plate 62, and the other end of spring II 67 is fixedly connected to the sealing plate 62. This allows spring II 67 to stretch and store energy when piston II 66 moves away from the sealing plate 62. When the external force disappears, spring II 67 can pull piston II 66 to return to its original position. It should be noted that when piston II 66 is blocked by the limiting ring II 71, spring II 67 remains in a stretched and stored state to ensure that spring II 67 has sufficient pulling force to drive piston II 66 to the designated position.

[0050] Piston II 66 has a fixedly inserted conveying pipe 68, which is L-shaped. A one-way valve is fixedly sleeved on the center of one side of the conveying pipe 68 inside piston II 66. This allows piston II 66 to squeeze the liquid material in the storage chamber when it moves away from sealing plate 62, opening the one-way valve and entering the conveying pipe 68. The conveying pipe 68 moves through sealing plate 62. A coating plate 53 is fixedly connected to the end of the conveying pipe 68 away from piston II 66. This allows the coating plate 53 to rotate synchronously with the connected negative pressure plate 5 through the conveying pipe 68 and the variable pipe 6. The L-shaped conveying pipe 68 allows the variable pipe 6 and the extension pipe 61 to still adhere to the box surface for coating operations without contacting the box surface.

[0051] The coating plate 53 has a manifold 54 connected to the conveying pipe 68. The coating plate 53 has a slit 55 on the side away from the negative pressure plate 5, which is connected to the manifold 54. When the coating plate 53 is in a horizontal state, the slit 55 is located on the outer side of the bottom end of the side sealing plate 8 near the long rod 27 in the horizontal direction, so that the liquid material entering the conveying pipe 68 can be forced into the manifold 54 and squeezed out through the slit 55 under pressure, and coated on the part of the carton to be coated.

[0052] An interface VI is fixedly connected to the outer side of the extended tube 61 near the sealing plate 62. The interface VI is equipped with a hose that is fixedly connected to the interface Ⅲ. This allows the transmission hydraulic rod 24 in the return hydraulic cylinder 231 to move towards the reversing tube 22 during the rotation of the short rod 28. At this time, the hydraulic oil in the forward direction of the transmission hydraulic rod 24 can enter the positive pressure chamber through the interface Ⅲ and the interface VI, causing the hydraulic oil in the positive pressure chamber to push the piston Ⅱ 66 to move away from the sealing plate 62. Conversely, when the piston Ⅱ 66 is in the reset movement, it can also squeeze the hydraulic oil in the positive pressure chamber back into the return hydraulic cylinder 231, pushing the transmission hydraulic rod 24 to move away from the reversing tube 22.

[0053] A piston I63 is movably sleeved inside the variable tube 6. A spring I65 is provided between the end of the piston I63 away from the extension tube 61 and the end of the inner cavity of the variable tube 6 away from the extension tube 61. The two ends of the spring I65 are respectively attached to the opposite ends of the piston I63 and the inner cavity of the variable tube 6.

[0054] A liquid storage chamber is formed between piston I 63 and piston II 66. An extension chamber is formed on the side of piston I 63 away from the liquid storage chamber. The liquid storage chamber is filled with liquid raw material. The extension chamber is an empty cavity. The moving tube 6 has a hole on the side away from piston I 63 that is connected to the outside. When piston I 63 moves towards the extension chamber, the air in the extension chamber can be discharged through the hole, reducing air resistance.

[0055] Both piston I 63 and piston II 66 are equipped with sealing rings, and the opening in the middle of the sealing plate 62 is equipped with a sealing ring.

[0056] A top post 64 is fixedly connected to the center of one end of piston I 63 opposite piston II 66. The diameter of the top post 64 is equal to the inner diameter of the delivery pipe 68. When piston II 66 moves toward piston I 63, piston II 66 will, at a set distance, cause the top post 64 to insert into the delivery pipe 68, blocking the one-way valve. This prevents the raw material from entering the delivery pipe 68, creating a sealed space in the storage chamber. As piston II 66 continues to move forward, all the liquid raw material in the storage chamber will act on piston II 66, causing piston II 66 to move away from piston I 63 and compress spring I 65. This allows piston II 66 to continue moving forward and drive the coating plate 53 to move synchronously. At this time, the coating plate 53 has no subsequent raw material pressure and cannot effectively squeeze the raw material out of the slit 55. This allows the coating plate 53 to continue moving away from the area to be pressed after coating, avoiding obstruction of the adhesion between the area to be bonded and the coated area by the inclined surface 52.

[0057] A limiting ring I7 is fixedly sleeved inside the variable tube 6. The limiting ring I7 is located between piston I63 and piston II66, which reduces the pressure in the positive pressure chamber. When piston I63 moves back to the direction of the sealing plate 62, it can be blocked by the limiting ring I7 to prevent piston I63 from excessive displacement, which would cause interface VII to connect to the extension chamber, allowing subsequent raw materials to enter the extension chamber. During this process, spring I65 is still in a compressed and stored state, ensuring that sufficient pressure is provided for piston I63 to move back.

[0058] The middle part of the variable tube 6 is fixedly connected to the interface VII, which is equipped with a one-way valve II. The interface VII is fixedly connected to the hose at the bottom of the raw material tube 41, so that when the piston II 66 moves to reset and disengages from the top column 64, the one-way valve is in the closed state. At this time, the liquid storage chamber is in a negative pressure state, thereby opening the one-way valve II and drawing in new raw materials through the interface VII for replenishment.

[0059] Two symmetrical transverse grooves 82 are provided in the middle of the side sealing plate 8 on one side of the short rod 28 for storing the variable pipe 6, the extension pipe 61 and the conveying pipe 68.

[0060] The side sealing plate 8 on one side of the short rod 28 has a thickness value that is smaller than that at other locations than the side sealing plate 8 near the pressing area, which is used to provide space for the coating plate 53 to move.

[0061] Example 2 Please see Figures 1 to 2 Based on Embodiment 1, T-shaped mounting plates 11 are fixedly connected to both sides of the hydraulic base 1 by bolts. Heating hydraulic cylinders 12 are movably sleeved on both sides of the mounting plates 11. Heating hydraulic rods are movably sleeved inside the heating hydraulic cylinders 12. Ultrasonic heating components 13 are fixedly connected to the bottom end of the heating hydraulic rods by bolts, so that the heating hydraulic cylinders 12 can drive the ultrasonic heating components 13 to move up and down and enter and exit the pressing area through the heating hydraulic rods.

[0062] The ultrasonic heating assembly 13 includes existing components such as an ultrasonic generator, transducer, amplitude transformer, and welding head for ultrasonic heating. The ultrasonic heating assembly 13 is located directly above the pressing area.

[0063] The welding head is in the shape of a straight plate. When the side suction plate 51 is in a vertical state, the bottom end of the welding head is close to the bottom end of the inclined surface. This allows the box surface adsorbed by the inclined surface 52 to be blown to adhere to the coating area. Then, the welding head can be pressed down into the pressing area and adhered to the side of the box surface facing the inclined surface 52. Ultrasonic rapid heat melting is then performed to complete the bonding operation.

[0064] Example 3 Please see Figure 11 Based on Embodiment 2, a motor base 9 is also provided.

[0065] A shelf 91 is circumferentially fixed to the bottom output end of the motor base 9. Multiple rotating rods 92 are fixedly connected to the bottom end of the shelf 91 by bolts. The end of the rotating rod 92 away from the motor base 9 is fixed to the top end of the hydraulic base 1 by bolts.

[0066] The hydraulic sleeve 21, air pipe 4, and raw material pipe 41 are connected to external devices that are fixed on the shelf 91.

[0067] The motor base 9 provides rotational power, driving the circumferentially distributed punches to rotate synchronously. Once one punch reaches a predetermined position above the cardboard after crease cutting, the hydraulic base 1 moves the punch downwards, causing the negative pressure plate 5 to press against the cardboard's forming surface for adsorption. The side suction plate 51 adsorbs one side of the cardboard's pressing area onto the inclined surface 52. The punch continues to rotate and lifts away from this station. The negative pressure plate 5 and side suction plate 51 act as "concave molds," causing the adsorbed cardboard to adhere to the four side walls of the punch. After reaching the next station, the carton is closed, and then ultrasonic heating and bonding are performed. Upon reaching the next station, the reversing valve connects to the positive pressure air source, releasing the formed carton for unloading. This allows the device to operate continuously, improving work efficiency.

[0068] Example 4 Based on Example 3, a glue-free integrated molding process for paper packaging boxes is applied to a glue-free integrated molding equipment, including the following steps: S1. The motor base drives the punch to rotate circumferentially through the rotating connecting rod. When it rotates to above the cardboard that has been cut and folded, the hydraulic base drives the punch to move down and abut against the cardboard. S2. The cavity of the negative pressure plate forms a negative pressure through the connected air pipe, which adsorbs the surface of the box. S3. The cavity of the side suction plate forms a negative pressure through the connected air pipe, which adsorbs the surface of the box to be glued. S4. The hydraulic base drives the punch to rise. At this time, the motor base drives the punch to move circumferentially. During this process, the hydraulic oil in the transmission hydraulic cylinder pushes the transmission hydraulic rod in the opposite direction to move towards the reversing tube, and drives the hinged connecting rod I and hinged connecting rod II to pull the long rod to rotate. This causes the negative pressure plate and side suction plate connected to the long rod to move closer to the side wall of the punch, and causes the adsorption box surface to deflect. S5. The hydraulic oil in the return hydraulic cylinder pushes the transmission hydraulic rod in the opposite direction to the reversing pipe, and drives the hinged connecting rod I and hinged connecting rod II to pull the short rod to rotate, which drives the negative pressure plate and coating plate connected to the short rod to move closer to the side wall of the punch, and causes the adsorbed box surface to deflect. S6. The hydraulic oil in the return hydraulic cylinder is pressed into the positive pressure chamber, squeezing piston II and driving the coating plate to move towards the negative pressure plate through the conveying pipe. Piston II squeezes the liquid raw material in the storage chamber, opens the one-way valve, and allows the liquid natural plant fiber raw material to be pressed into the manifold through the conveying pipe and squeezed out from the slit to be evenly coated on the box surface. S7. After the punch reaches the next station, the next punch following up reaches the cardboard. At this time, the carton on this punch is closed. The side suction plate starts to spray air to push the adsorbed box surface to adhere to the coating area, and moves down to start the ultrasonic heating component to perform ultrasonic heating and bonding on this box surface. Then the ultrasonic heating component moves up. S8. The punch continues to rotate. After reaching the next station, the negative pressure plate switches to air blowing, causing the formed carton to fall off.

Claims

1. A glue-free integrated molding equipment for paper packaging boxes, characterized in that, Includes a motor base (9), the output end of which is provided with a shelf (91), the bottom end of which is provided with a plurality of circumferentially distributed rotating connecting rods (92), and the side of the rotating connecting rods (92) away from the shelf (91) is provided with a hydraulic base (1). The output end of the hydraulic base (1) is provided with a connecting sleeve (2), and the bottom end of the connecting sleeve (2) is provided with a punch; The punch is provided with a hydraulic sleeve (21), which includes an inner tube and an outer tube. The bottom of the hydraulic sleeve (21) is provided with four circumferentially distributed reversing tubes (22) that are connected to the inner tube. The reversing pipe (22) is provided with a transmission hydraulic cylinder (23) on the side away from the inner pipe. The transmission hydraulic cylinder (23) is provided with a transmission hydraulic rod (24). The outer end of the transmission hydraulic rod (24) is sequentially hinged with a hinged connecting rod I (25) and a hinged connecting rod II (26). The two opposing transmission hydraulic cylinders (23) are closed at the end near the reversing pipe (22) to form a return hydraulic cylinder (231). The punch has side sealing plates (8) on its four sides, and the adjacent ends of the side sealing plates (8) form a 90-degree angle and a pressing area. Two of the opposite side sealing plates (8) are provided with long rods (27) at the bottom, and two other opposite side sealing plates (8) are provided with short rods (28) at the bottom. The long rods (27) and short rods (28) are respectively hinged to the end of the nearby hinged connecting rod II (26) away from the hinged connecting rod I (25). Both the long rod (27) and the short rod (28) are provided with two symmetrical negative pressure plates (5), and the negative pressure plates (5) have cavities and multiple openings at the bottom. The long rod (27) has side suction plates (51) at both ends. The side suction plates (51) are located in the pressing area. An inclined surface (52) is opened on the side of the side suction plate (51) away from the negative pressure plate (5). A cavity is opened in the side suction plate (51). Multiple downward inclined openings are opened on the inclined surface (52). The short rod (28) has a coating device on one side of the negative pressure plate (5), including a variable tube (6), an extension tube (61) on the side of the variable tube (6) away from the negative pressure plate (5), a sealing plate (62) at the end of the extension tube (61), an L-shaped delivery tube (68) inside the extension tube (61) and passing through the sealing plate (62), and a coating plate (53) at the outer end of the delivery tube (68).

2. The glue-free integrated molding equipment for paper packaging boxes according to claim 1, characterized in that, The punch includes a mounting base (3) at the top and a base plate (31) at the bottom of the mounting base (3). A limiting groove (32) and a movable groove (33) are provided in the punch. Multiple recessed grooves (34) are provided on the four sides of the punch. Air pipes (4) are provided in the recessed grooves (34). Raw material pipes (41) are provided in the two recessed grooves (34) on one side of the short rod (28).

3. The glue-free integrated molding equipment for paper packaging boxes according to claim 2, characterized in that, The bottom center of the side sealing plate (8) is provided with an expansion groove that communicates with the movable groove (33) on the side facing the punch. The hinged connecting rod II (26) and hinged connecting rod I (25) are located in the movable groove (33) and the expansion groove. The side sealing plate (8) is provided with multiple vertical grooves (81). The side sealing plate (8) on the side of the short rod (28) has two symmetrical horizontal grooves (82) in the middle. The side sealing plate (8) on this side is closer to the pressing area and its thickness is less than that of other parts.

4. The glue-free integrated molding equipment for paper packaging boxes according to claim 3, characterized in that, The variable tube (6) is provided with piston I (63), and spring I (65) is provided on the side of piston I (63) away from the extension tube (61). A top post (64) is provided on the other side of piston I (63). Piston II (66) is provided in the extension tube (61). Spring II (67) is provided on the side of piston II (66) away from the top post (64). One end of the conveying tube (68) is fixedly inserted through piston II (66), and a one-way valve is provided in this end. The diameter of the top post (64) is equal to the inner diameter of the conveying tube (68).

5. The glue-free integrated molding equipment for paper packaging boxes according to claim 4, characterized in that, A positive pressure cavity is formed between piston II (66) and sealing plate (62), and a liquid storage cavity is formed between piston I (63) and piston II (66). The liquid storage cavity is filled with liquid natural plant fiber raw material. An extension cavity is formed on the side of piston I (63) away from the liquid storage cavity. A manifold cavity (54) is opened in the coating plate (53) and connected to the delivery pipe (68). A slit (55) is opened on the side of the coating plate (53) away from the negative pressure plate (5) and connected to the manifold cavity (54).

6. The glue-free integrated molding equipment for paper packaging boxes according to claim 5, characterized in that, The variable tube (6) is provided with a limiting ring I (7) between piston I (63) and piston II (66), and the extended tube (61) is provided with a limiting ring II (71) between the sealing plate (62) and piston II (66).

7. The glue-free integrated molding equipment for paper packaging boxes according to claim 6, characterized in that, The bottom of the outer tube is provided with four circumferentially distributed interfaces I. The transmission hydraulic cylinder (23) is provided with interface II on the side away from the reversing pipe (22) and connected to interface I. The return hydraulic cylinder (231) is provided with interface III on the side near the reversing pipe (22). The top of the negative pressure plate (5) is connected to interface IV on the side near the punch and connected to the air pipe (4). The long rod (27) has an inner cavity that is connected to the cavity of the side suction plate (51). The long rod (27) is provided with interface V and connected to the air pipe (4). The extended pipe (61) is provided with interface VI on the side near the sealing plate (62) and connected to interface III. The middle part of the variable pipe (6) is provided with interface VII. One-way valve II is provided in interface VII and connected to the raw material pipe (41).

8. The glue-free integrated molding equipment for paper packaging boxes according to claim 7, characterized in that, The hydraulic base (1) has T-shaped mounting plates (11) on both sides. Heating hydraulic cylinders (12) are provided on both sides of the mounting plates (11). Heating hydraulic rods are provided inside the heating hydraulic cylinders (12). Ultrasonic heating components (13) are provided at the bottom of the heating hydraulic rods. The ultrasonic heating components (13) are located above the pressing area.

9. The glue-free integrated molding equipment for paper packaging boxes according to claim 8, characterized in that, The ultrasonic heating assembly (13) includes an ultrasonic generator, a transducer, an amplitude transformer, and a welding head in the shape of a straight plate.

10. A glue-free, integrated molding process for paper packaging boxes, applied to the equipment described in claim 9, characterized in that, Includes the following steps: S1, the motor base (9) drives the punch to rotate circumferentially through the rotating connecting rod (92). When it rotates to the top of the cardboard that has been cut and creased, the hydraulic base (1) drives the punch to move down and abut against the cardboard. S2, The cavity of the negative pressure plate (5) forms a negative pressure through the connected air pipe (4), which adsorbs the box surface; S3, the cavity of the side suction plate (51) forms a negative pressure through the connected air pipe, adsorbing the box surface to be glued; S4. The hydraulic base (1) drives the punch to rise. At this time, the motor base (9) drives the punch to move in the circumferential direction. During this process, the hydraulic oil in the transmission hydraulic cylinder (23) pushes the transmission hydraulic rod (24) in the opposite direction to move in the direction of the reversing pipe (22), and drives the hinged connecting rod I (25) and hinged connecting rod II (26) to pull the long rod (27) to rotate, and drives the negative pressure plate (5) and the side suction plate (51) connecting the long rod (27) to move closer to the side wall of the punch, and drives the adsorbed box surface to deflect. S5. The hydraulic oil in the return hydraulic cylinder (231) pushes the transmission hydraulic rod (24) in the opposite direction to move towards the reversing pipe (22), and drives the hinged connecting rod I (25) and hinged connecting rod II (26) to pull the short rod (28) to rotate, and drives the negative pressure plate (5) and coating plate (53) connecting the short rod (28) to move closer to the side wall of the punch, and drives the adsorbed box surface to deflect. S6. The hydraulic oil in the return hydraulic cylinder (231) is pressed into the positive pressure chamber, squeezing the piston II (66) and driving the coating plate (53) to move towards the negative pressure plate (5) through the delivery pipe (68). The piston II (66) squeezes the liquid raw material in the storage chamber and opens the one-way valve, so that the liquid natural plant fiber raw material is pressed into the manifold (54) through the delivery pipe (68) and squeezed out from the slit (55) to be evenly coated on the box surface. S7. After the punch reaches the next station, the next punch following up reaches the cardboard. At this time, the carton on the punch is closed. The side suction plate (51) starts to spray air to push the adsorbed box surface to adhere to the coating area, and moves down to start the ultrasonic heating component (13) to perform ultrasonic heating and bonding on the box surface. Then the ultrasonic heating component (13) moves up. S8. The punch continues to rotate and reaches the next station. The negative pressure plate (5) switches to air blowing, causing the formed carton to fall off.

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