A type of paper box forming machine

Abstract

This invention discloses a paper box forming machine, including a paper box forming mechanism. The paper box forming mechanism includes a pre-forming mold, a side forming mold, and a forming die. The pre-forming mold and the forming die are used for forming the paper box flap and the upper surface, while the side forming mold and the forming die are used for forming the sides of the paper box. The forming die of this invention, in conjunction with the pre-forming mold and the side forming mold, achieves paper box forming with an upper surface. Compared to using two separate sets of molds, this invention reduces manufacturing costs and achieves higher forming accuracy.

Description

Technical Field

[0001] This invention relates to the field of packaging, specifically to a paper box forming machine. Background Technology

[0002] Paper box forming typically uses molded cardboard with creases as blanks. The upper and lower molds press the cardboard along the creases to form the box. Existing paper box forming machines have the following shortcomings in practical applications: 1. Complex processes and high equipment costs: Multiple processes, including cardboard taking, folding the top surface of the box, and side wall forming, often require multiple stations or sets of molds, resulting in complex equipment structure and high manufacturing and maintenance costs; 2. Poor forming effect and uneven bottom surface: Due to uneven stress on the bottom surface during the pressing process, bottom deformation and protrusion are prone to occur, affecting the appearance and subsequent inner lining installation. Summary of the Invention

[0003] In view of the technical problems existing in the background art, the technical problem to be solved by the present invention is to provide a paper box forming machine with simplified process and good paper box forming effect.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: This type of paper box forming machine is characterized by comprising a paper box forming mechanism, which includes a pre-forming mold, a side forming mold, and a forming die. The pre-forming mold and the forming die are used for forming the paper box flap and the upper surface, while the side forming mold and the forming die are used for forming the sides of the paper box. The forming die of the present invention, in conjunction with the pre-forming mold and the side forming mold, achieves paper box forming with an upper surface. Compared to using two other sets of independent molds, the present invention reduces manufacturing costs and achieves higher forming accuracy.

[0005] Preferably, the forming die includes a die base, a lower support plate, and a small tongue stop; The die holder includes side forming baffles, which include a left baffle, a right baffle, a front baffle, and a rear baffle, forming a cavity. The lower support plate is disposed within the cavity, and the opposite side forming baffle can be raised and lowered. The small tongue stop has four parts, each located at one of the four corners of the side forming baffle. The small tongue stop is higher than the lower support plate and the side forming baffle at least when the tongue is folded. During the carton forming process, the lower support plate supports the bottom surface of the carton, keeping it flat and preventing deformation, thereby improving the quality of the carton forming.

[0006] Preferably, the die holder includes a support plate, which is disposed below the lower support plate. A first spring is provided between the lower support plate and the support plate to reset the lower support plate. The lower support plate moves downward relative to the die holder under the push of the forming punch. After the paper box is formed, the lower support plate moves upward and resets by the first spring.

[0007] In the initial state, the upper surfaces of the lower support plate and the side forming baffle are at the same height, and the small tongue block is higher than the lower support plate and the side forming baffle. The small tongue stop is mounted on the connecting plate, which is located below the support plate. A first guide rod is mounted on the lower support plate, and a first guide hole is provided on the support plate. The lower end of the first guide rod passes through the first guide hole and connects to the connecting plate. When the lower support plate moves downwards, the small tongue stop also moves downwards, preventing the small tongue stop from colliding with other parts of the paper card.

[0008] Preferably, the preform mold includes a punch seat and a pressure plate. The punch seat is provided with a left insert plate, a right insert plate and a rear insert plate for forming the upper surface of the paper box. The punch seat moves up and down relative to the die seat in the pre-forming station. The pressure plate is movably installed on the punch seat and moves up and down relative to the punch seat in the pre-forming station. The pressure plate is provided with a small tongue stop relief groove. At the pre-forming station, the pressure plate is pressed against the side forming baffle. The left, right, and rear insert plates of the punch seat are located outside the left, right, and rear baffles of the die seat and cooperate to fold the upper surface of the carton. As the left, right, and rear insert plates continue to move downward, they push the upper surface of the carton downward along the left, right, and rear baffles to form the upper surface of the carton.

[0009] Preferably, the preforming mold is mounted on a first swing frame, which drives the preforming mold to switch between the material picking station and the preforming station, and the bottom surface of the pressure plate is provided with a first paper suction element; At the material handling station, the preforming mold faces the paper card holder and moves relative to the paper card holder; at the preforming station, the preforming mold faces the forming die and is directly above the forming die, and moves up and down relative to the forming die. The first swing frame oscillates, causing the pre-forming mold to switch between the material handling station and the forming station. At the material handling station, the pre-forming mold moves towards the cardboard tray, where the first paper suction component picks up the cardboard from the tray's outlet. The cardboard is then removed from the tray by the retraction of the pre-forming mold, thus achieving material handling. At the forming station, the pre-forming mold moves towards the forming die and presses against it to form the cardboard. The pre-forming mold serves both for cardboard feeding and forming, reducing the number of processed parts, lowering equipment manufacturing costs, and simultaneously improving production and forming stability, resulting in higher forming accuracy and better forming quality.

[0010] Preferably, the forming die reciprocates between the preforming station and the side forming station; At the side forming station, the side forming mold is directly above the forming die, and the side forming mold moves up and down relative to the forming die.

[0011] Preferably, the side forming mold includes a forming mold base and a forming punch. The bottom surface of the forming punch matches the tray, and the side of the forming punch cooperates with the left baffle, right baffle, front baffle, and rear baffle for forming the side of the paper box. During the side forming of the cardboard box, the forming mold base is pressed against the side forming baffle.

[0012] After the forming die completes the forming of the small tongue and the upper surface of the carton, it moves to the side forming station. The forming punch moves down and pushes the tray down. The bottom surface of the carton moves down together under the clamping of the forming punch and the tray. The side of the carton is blocked by the side forming baffle and folds upward and enters the cavity formed by the forming baffle, thus realizing the side forming of the carton. The forming die presses down on the upper surface of the carton, keeping it folded with the side of the carton.

[0013] Preferably, the upper surface of the side forming baffle is provided with a first suction box component. When the preforming mold moves up and resets, the first suction box component will absorb the paper card to prevent the paper card from being taken away or shifted.

[0014] The bottom surface of the forming punch is provided with a second suction box component; the forming punch moves upward and suctions the formed paper box, and then removes the paper box.

[0015] Preferably, the upper section of the inner side surface of the left baffle and the right baffle is provided with a first clearance curved surface; during side forming, the front side and rear side of the carton are earlier than the left side and the right side, so that the small tongue integrated with the front side and the rear side is inside the left side and the right side, and the small tongue is bonded to the left side and the right side to keep the carton in the formed state.

[0016] Preferably, the side of the small tongue block facing the lower support plate is a folded tongue surface, and the upper section of the folded tongue surface is provided with a second clearance curved surface. The folded small tongue is slightly tilted outward, so that it can smoothly enter between the side of the carton and the forming punch during subsequent side folding, avoiding collision with the forming punch.

[0017] Preferably, the forming mold base is provided with a small tongue relief groove; used to avoid the small tongue during the side forming process.

[0018] Preferably, the paper box forming machine further includes an inner liner forming mechanism, which includes an upper inner liner mold and a lower inner liner mold. The inner lining upper mold includes an inner lining mold base, and a forming groove is provided in the middle of the inner lining mold base; The inner lining lower mold includes a lower mold base and a forming insert plate. The forming insert plate is disposed on the lower mold base. The top of the forming insert plate is a pointed ridge line, and the vertical cross section of the forming insert plate is an isosceles triangle. At the lining forming station, the lining mold base and the lower mold base are pressed together vertically. The forming insert is inserted into the forming groove, and the edges on both sides of the forming groove are aligned with the bottom edges of the forming insert on both sides of the lower mold base. The top of the forming insert cooperates with the lining mold base to press the lining cardboard, causing it to fold along the center fold line and enter the forming groove. The folded cardboard covers the two sides of the forming insert and the surface of the lower mold base. The lining mold base and the lower mold base are pressed together, and the forming insert is inserted into the forming groove. The edges on both sides of the forming groove are pressed with the bottom edges of the forming insert on both sides of the lower mold base and press against the fold lines on the two bottom surfaces of the lining cardboard, so that the lower end of the lining cardboard is folded to both sides along the bottom fold lines to form a left bottom plate and a right bottom plate. The left bottom plate and the right bottom plate are used to bond to the bottom surface of the cardboard box.

[0019] Preferably, the inner lining lower mold further includes a left limiting block and a right limiting block that move relative to the lower mold base. The left limiting block and the right limiting block are arranged on both sides of the forming insert plate, and the distance from the left limiting block to the left bottom edge of the forming insert plate on the lower mold base is consistent with the width of the left bottom plate of the paper card, and the distance from the right limiting block to the right bottom edge of the forming insert plate on the lower mold base is consistent with the width of the right bottom plate of the paper card. The lower mold base has a first through hole for the left limiting block and the right limiting block to pass through. The left limiting block and the right limiting block move upward to block the bottom of the paper card, ensuring that the lower end of the paper card is folded along the bottom fold line to form the left bottom plate and the right bottom plate.

[0020] Preferably, the lower mold base is equipped with a left suction component and a right suction component to respectively absorb the left and right bottom plates. The left and right suction components, the left and right limiting blocks, and the right limiting blocks are mounted on a lifting plate, which moves relative to the lower mold base. The lower mold base has a second through hole for the left and right suction components to pass through. During the molding of the lining, the lining mold base provides rigid support. The left and right suction components move upward and press against the left and right bottom plates of the lining being molded, absorbing them. In this way, when the upper mold of the lining moves upward, the molded lining will not be carried away or displaced, preparing for the subsequent assembly of the lining.

[0021] Preferably, a second paper suction component is installed on the inner lining mold base, and the second paper suction component is arranged on both sides of the forming groove. At the inner lining forming station, when the inner lining card is about to contact the forming insert plate, the second paper suction component releases the inner lining card. At the same time, the forming insert plate presses the inner lining card to fold it in half, and the second paper suction component releases the inner lining card to avoid deformation or damage to the second paper suction component and the inner lining card, so that the inner lining card can be formed smoothly.

[0022] The inner lining upper mold is mounted on the second swing frame, and the second swing frame drives the inner lining upper mold to switch between the inner lining material taking station and the inner lining forming station. At the lining material feeding station, the upper lining mold faces the lining material rack, and the forming groove is aligned with the center fold line of the lining card. The upper lining mold moves relative to the lining material rack. At the lining forming station, the upper lining mold moves up and down relative to the lower lining mold. The upper lining mold is used for both lining card conveying and lining forming, reducing the number of processing parts, lowering equipment manufacturing costs, and improving production and forming stability, while also increasing the accuracy of forming and positioning.

[0023] Preferably, the inner liner mold base includes a pressing part and an mounting part. The pressing part is pressed with the lower mold base, the forming groove is disposed in the pressing part, and the second paper suction member is mounted in the mounting part and disposed on both sides of the pressing part. At the lining forming station, the pressing part is vertically projected onto the lower mold base, between the left and right limiting blocks; this reduces the weight of the lining mold base while avoiding the left and right limiting blocks.

[0024] Preferably, the bottom surface of the pressing part has chamfered edges on both sides; the inner lining card is made of at least two layers of paper. Folding the inner lining card will cause the paper to stretch slightly. If the pressing part is pressed with the lower mold base, the pressing force of the inner lining plate will be large, and wrinkles will appear in the formed inner lining. The chamfering reduces the contact area between the pressing part and the inner lining, reduces friction, and makes the inner lining forming effect better.

[0025] Preferably, the paper box forming mechanism further includes a folding die, which includes a folding die base and an interference fit plate. The interference fit plate is disposed on the upper surface of the folding die base and includes a left folding plate, a right folding plate, and a rear folding plate. The top of the left folding plate, the right folding plate, and the rear folding plate are pointed ridges, and the outer side is a downward and outward inclined surface. The left folding plate, the right folding plate, and the rear folding plate together form the paper box cavity. The over-folding die reciprocates between the side forming station and the carton output station; it is used for the transfer of formed cartons and also for interference folding of the upper surface of the carton. After the carton leaves the die, the upper surface of the carton will spring back, and the upper surface of the interference-folded carton will spring back to approximately a 90-degree angle with the side of the carton, meeting the needs of subsequent production.

[0026] The paper box forming machine also includes an inner liner transfer mechanism, which includes a pressing and sticking mold that moves up and down. The pressing and sticking mold includes a pressing and sticking mold base, which is provided with a clearance groove. The bottom surface of the pressing and sticking mold base is also provided with an inner liner adsorption component. The lower mold of the inner lining moves back and forth between the inner lining forming station and the inner lining output station; The pressing and bonding mold moves back and forth between the inner liner output station and the carton output station.

[0027] The lower mold of the inner liner sends the formed inner liner to the inner liner output station. The pressing and bonding mold uses the inner liner adsorption component to adsorb the formed inner liner at the inner liner output station, and then sends it to the inner liner output station to put the inner liner into the formed cardboard box, so that the inner liner is bonded to the upper surface of the bottom of the cardboard box.

[0028] Preferably, the pressing and bonding mold is provided with a folding tongue plate, which includes a left tongue plate, a right tongue plate and a rear tongue plate, and respectively folds and cooperates with the outer sides of the left folding plate, the right folding plate and the rear folding plate; during the bonding process between the liner and the cardboard box, the folding tongue plate presses down on the upper surface of the cardboard box, so that the upper surface of the cardboard box is over-folded downwards.

[0029] Preferably, the bottom surface of the pressing and bonding mold base is also provided with a fourth suction box component; a conveyor belt is provided below the over-folding lower mold at the paper box conveying station. After the liner is bonded to the paper box, the pressing and bonding mold base uses the fourth suction box component to adsorb the bottom surface of the paper box, causing the paper box to detach from the mold. After the paper box is removed, the fourth suction box component blows air to cause the paper box to detach from the pressing and bonding mold and fall onto the conveyor belt below.

[0030] Preferably, a side gluing component is provided between the preforming station and the side forming station; the side gluing component applies glue to the bonding area between the side of the cardboard box and the small tongue, and the glued side of the cardboard box is bonded to the small tongue during the side forming process.

[0031] Preferably, a bottom-surface adhesive component is provided between the side forming station and the carton output station. The bottom-surface adhesive component applies adhesive to the bottom surface of the carton, and the pressing mold delivers the formed liner into the carton, where the left and right bottom plates of the formed liner are bonded to the bottom surface of the carton. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of the present invention.

[0033] Figure 2 This is a schematic diagram of the paper box forming mechanism of the present invention.

[0034] Figure 3 This is a schematic diagram of the preform mold of the present invention. Figure 1 .

[0035] Figure 4 This is a schematic diagram of the preform mold of the present invention. Figure 2 .

[0036] Figure 5 This is a schematic diagram of the molding die of the present invention.

[0037] Figure 6 This is a cross-sectional view of the molding die of the present invention.

[0038] Figure 7 This is a schematic diagram of the side forming mold of the present invention.

[0039] Figure 8This is a schematic diagram of the over-folding lower mold of the present invention.

[0040] Figure 9 This is a schematic diagram of the lining forming mechanism and the lining transfer mechanism of the present invention.

[0041] Figure 10 This is a schematic diagram of the inner lining upper mold of the present invention.

[0042] Figure 11 This is a cross-sectional view of the lower mold of the inner lining of the present invention.

[0043] Figure 12 This is a schematic diagram of the lining transfer mechanism of the present invention.

[0044] Figure 13 This is a schematic diagram of the driving component of the present invention.

[0045] Figure 14 This is a schematic diagram of the paper box forming process of the present invention.

[0046] Reference numerals: 1. Pre-forming mold; 11. Pressure plate; 12. Punch seat; 121. Left insert plate; 122. Rear insert plate; 123. Right insert plate; 13. Relief groove; 14. Second guide rod; 15. Second spring; 16. Limiting block; 17. Second cylinder; 18. First paper suction component; 2. Rotating shaft; 21. First swing frame; 22. Second swing frame; 23. Paper card holder; 24. Inner liner holder; 25. Drive component; 251. First cylinder; 252. Synchronous pulley; 253. Second limiting block; 254. Slider; 255. Linear guide rail; 256. Synchronous belt; 257. First limiting block; 3. Forming 31. Cavity mold; 311. Side forming baffle; 312. Left baffle; 313. Rear baffle; 314. Right baffle; 315. Front baffle; 316. First clearance surface; 32. Small tongue block; 321. Second clearance surface; 33. Lower support plate; 34. First suction box component; 35. First spring; 36. First guide rod; 37. Support plate; 38. Connecting plate; 39. Third suction box component; 4. Inner liner upper mold; 41. Inner liner mold base; 411. Pressing part; 412. Mounting part; 44. Forming groove; 45. Second suction paper component; 46. Edges on both sides of the forming groove; 47. Chamfer; 5. Inner liner lower mold; 51. Lower mold base; 52. Forming insert plate; 521. Pointed ridge line; 522. Bottom edges of the forming insert plate on both sides of the lower mold base; 53. Right suction component; 54. Right limiting component; 55. Lifting plate; 6. Side forming mold; 61. Forming punch; 62. Forming mold base; 63. Second suction component; 64. Small tongue clearance groove; 7. Over-fold lower mold; 71. Over-fold mold base; 72. Interference fold plate; 73. Fifth suction component; 8. Pressing mold; 81. Pressing mold base; 82. Over-fold tongue plate; 83. Fourth suction component; 84. Inner liner suction component; 85. Clearance groove; 9. Cardboard; 91. Small tongue; 92. Bottom surface of the cardboard box; 93. Side surface of the cardboard box; 9 31. Left side; 932. Rear side; 933. Right side; 934. Front side; 94. Top surface of the box; 95. Bottom edge fold line; 96. Top surface fold line; 97. Tongue fold line; 98. Center fold line; 99. Bottom fold line; 100. Inner lining card; 1001. Left bottom plate; 1002. Right bottom plate; 101. Material picking station; 102. Pre-forming station; 103. Side forming station; 104. Box output station; 105. Inner lining material picking station; 106. Inner lining forming station; 107. Inner lining output station; 108. Side gluing component; 109. Bottom surface gluing component. Detailed Implementation

[0047] The following description, in conjunction with the accompanying drawings, details the embodiments and working principles of the present invention. Figure 1 The X-axis represents the left-right direction, the Y-axis represents the front-back direction, and the Z-axis represents the up-down direction.

[0048] This type of paper box forming machine includes a paper box forming mechanism, which includes a pre-forming mold 1, a side forming mold 6, and a forming concave mold 3. The pre-forming mold 1 and the forming concave mold 3 are used for forming the paper box flap and the upper surface, while the side forming mold 6 and the forming concave mold 3 are used for forming the paper box sides 93. The paper box forming machine also includes an inner liner forming mechanism and an inner liner transfer mechanism. The inner liner forming mechanism includes an upper inner liner mold 4 and a lower inner liner mold 5, which are used for forming the inner liner. The inner liner transfer mechanism includes a pressing and bonding mold 8, which sends the formed inner liner into the formed paper box. The formed inner liner is bonded to the formed paper box to form a paper box with an inner liner. The bonding includes adhesive bonding and heat sealing bonding.

[0049] The molding station for the pre-forming mold 1 and the molding die 3 is the pre-forming station 102, and the molding station for the side molding mold 6 and the molding die 3 is the side molding station 103. The molding die 3 reciprocates between the pre-forming station 102 and the side molding station 103. The molding station for the inner liner upper mold 4 and the inner liner lower mold 5 is the inner liner molding station 106. The pressing and bonding mold 8 can take the molded inner liner from the inner liner molding station 106 and send it to the molded cardboard box in the side molding station 103, and cooperate with the molding die 3 to bond the molded inner liner to the cardboard box. To improve efficiency, the inner liner forming mechanism is equipped with an inner liner output station 107, and the inner liner lower mold 5 reciprocates between the inner liner forming station 106 and the inner liner output station 107. The paper box forming mechanism is equipped with a paper box output station 104, and also includes a folding lower mold 7, which reciprocates between the side forming station 103 and the paper box output station 104. The pressing and bonding mold 8 takes the inner liner from the inner liner output station 107 and sends it to the paper box output station 104. The pressing and bonding mold and the folding lower mold 7 press together to bond the inner liner to the paper box and perform an interference fold on the upper surface of the paper box. This avoids occupying the forming die 3 and the inner liner lower mold 5, thereby improving production efficiency. The interference fold makes the angle between the upper surface of the paper box and the side of the paper box less than 90 degrees. After the paper box leaves the mold, the interference-folded upper surface of the paper box springs back to approximately a 90-degree angle with the side of the paper box, meeting subsequent production requirements.

[0050] See attached Figure 1The pre-forming station 102, side forming station 103, and carton output station 104 are arranged sequentially along the Y-axis, while the inner liner forming station 106, inner liner output station 107, and carton output station 104 are arranged sequentially along the X-axis. If the inner liner and carton are bonded with adhesive, the pre-forming station 102 and side forming station 103 are equipped with side gluing components 108, which apply adhesive to the side of the carton where it meets the small tongue. The side forming station 103 and carton output station 104 are equipped with bottom gluing components 109, which apply adhesive to the bottom surface of the carton. The pressing mold delivers the formed inner liner into the carton, and the left bottom plate 1001 and right bottom plate 1002 of the formed inner liner are bonded to the bottom surface of the carton. These two gluing processes can be performed during mold movement.

[0051] To reduce production costs, the pre-forming mold 1 is used for both cardboard box forming and cardboard card picking. The pre-forming mold 1 is mounted on a first swing frame 21 and is movable relative to the first swing frame. The pre-forming mold 1 is equipped with a first paper suction element 18. The first swing frame 21 is oscillatingly mounted on the machine frame, and the first swing frame drives the pre-forming mold to switch between the material picking station 101 and the pre-forming station 102. At the material picking station 101, the pre-forming mold faces the cardboard material rack 23 and moves relative to the cardboard material rack 23; at the pre-forming station 102, the pre-forming mold faces the forming die 3 and is directly above the forming die, and moves up and down relative to the forming die. The first swing frame 21 swings to switch the pre-forming mold 1 between the picking station and the pre-forming station. At the picking station, the pre-forming mold moves towards the paper card rack, and the first paper suction component 18 approaches the paper card at the discharge port of the paper card rack 23 and suctions the paper card. Then, the pre-forming mold retracts and resets on the first swing frame, causing the suctioned paper card to detach from the paper card rack 23 to achieve picking. After picking, the first swing frame 21 swings the pre-forming mold to the pre-forming station 102. At the pre-forming station, the pre-forming mold moves downward, and the pre-forming mold 1 presses against the forming die 3 to form the paper card. The pre-forming mold 1 is used for picking up and feeding paper cards, and also participates in paper card forming, integrating paper card conveying and paper card forming into one unit, simplifying the equipment structure and reducing equipment manufacturing costs. The pre-forming mold 1 and the paper card do not undergo secondary transfer from picking up the paper card to forming, resulting in higher forming positioning accuracy, better forming quality, and higher production efficiency.

[0052] The preforming mold 1 includes a punch seat 12 and a pressure plate 11. The pressure plate is movably mounted on the punch seat and moves relative to the punch seat 12 at the preforming station. The first paper suction element 18 is disposed on the bottom surface of the pressure plate 11. The punch seat 12 is provided with insert plates for forming the upper surface 94 of the paper box. The insert plates include a left insert plate 121, a right insert plate 123, and a rear insert plate 122. The left insert plate, right insert plate, and rear insert plate are respectively disposed on the left side, right side, and rear of the pressure plate 11.

[0053] The forming die 3 includes a die base and a lower support plate 33. The die base includes a side forming baffle 31, which includes a left baffle 311, a right baffle 313, a front baffle 314, and a rear baffle 312. The left baffle, right baffle, front baffle, and rear baffle form a cavity. The lower support plate 33 is disposed within the cavity and can move up and down relative to the side forming baffle 31. During the cardboard box forming process, the lower support plate 33 supports the bottom surface 92 of the cardboard box, keeping it flat and preventing deformation of the bottom surface. At the pre-forming station 102, the left insert plate 121, right insert plate 123, and rear insert plate 122 of the punch base are respectively located outside the left baffle 311, right baffle 313, and rear baffle 312 of the die base and cooperate to fold the upper surface 94 of the cardboard box. During the preforming process, the punch seat 12 moves downward relative to the die seat, the pressure plate 11 presses against the side forming baffle 31, and the bottom and sides of the paper box are fixed by the pressure plate 11 and the side forming baffle 31. The fold line 96 on the upper surface of the paper box is aligned with the outer edge of the side forming baffle 31. As the punch seat 12 continues to move downward, the pressure plate 11 is blocked by the side forming baffle 31 and cannot move downward further. The left insert plate 121, the right insert plate 123, and the rear insert plate 122 continue to move downward, which pushes the upper surface 94 of the paper box to fold downward along the left baffle 311, the right baffle 313, and the rear baffle 312 to form the upper surface of the paper box, that is, the upper surface of the paper box folds downward along the fold line 96 on the upper surface of the paper box.

[0054] The lower support plate 33 can be raised and lowered by a separate power drive. To reduce manufacturing costs, the die holder includes a support plate 37, which is located below the lower support plate 33. A first spring 35 is provided between the lower support plate and the support plate to reset the lower support plate. During the paper box forming process, the lower support plate 33 moves downward relative to the die holder under the push of the forming punch 61, and the first spring 35 keeps the lower support plate 33 pressed against the forming punch 61. After the paper box is formed, the forming punch and the forming die separate, and the first spring 35 pushes the lower support plate 33 upward to reset.

[0055] The forming die 3 also includes a small tongue stop 32, which is used for folding the small tongue 91 of the paper box. There are four small tongue stops 32, which are respectively set at the four corners of the side forming baffle 31. The small tongue stops are higher than the side forming baffle 31 at least when folding the small tongue. The pressure plate 11 is provided with a small tongue stop clearance groove 13. In the initial state, the upper surfaces of the lower support plate 33 and the side forming baffle 31 are at the same height, and the small tongue stops 32 are higher than the lower support plate and the side forming baffle. The pressure plate moves down with the paper card. The paper card first folds the small tongue and then folds the upper surface. The small tongue stops 32 make the small tongue 91 of the paper box fold upward relative to the side 93 and the bottom 92 of the paper box. When the bottom surface of the paper box is in contact with the lower support plate 33, the small tongue stops complete the small tongue folding. Then the insert plate moves down relative to the side forming baffle 31 to realize the folding of the upper surface of the paper box. After the forming die 3 completes the forming of the paper box tongue 91 and the upper surface 94 of the paper box, the pre-forming die 1 moves upward and resets. In order to prevent the paper box from being taken away by the pre-forming die 1, the upper surface of the side forming baffle 31 is provided with a first suction box member 34. When the pre-forming die moves upward and resets, the first suction box member 34 will attract the paper box, preventing the paper box from being taken away or shifted, and ensuring that the secondary forming of the paper box is stable and accurate.

[0056] To prevent the small tongue block 32 from affecting the forming of the side panel 93 of the cardboard box, the small tongue block and the lower support plate 33 move up and down together. See attached document. Figure 6 The small tongue block 32 is installed on the connecting plate 38, which is located below the support plate 37. The lower support plate 33 is equipped with a first guide rod, and the support plate 37 is provided with a first guide hole. The lower end of the first guide rod 36 passes through the first guide hole and connects to the connecting plate 38. The first guide rod and the first guide hole guide and cooperate to stabilize the lower support plate 33 and the connecting plate 38 in raising and lowering. When the lower support plate 33 moves down, the small tongue block 32 also moves down with it. In this way, during the forming process of the side of the paper box 93, the small tongue block 32 is prevented from colliding with other parts of the paper card.

[0057] The pressure plate 11 is equipped with a second guide rod 14, and the punch seat 12 is provided with a second guide hole. The upper end of the second guide rod 14 passes through the second guide hole and is connected to the limiting block 16. A second spring 15 is provided between the pressure plate 11 and the punch seat 12 to reset the pressure plate. The two ends of the second spring 15 abut against the pressure plate and the punch seat respectively. When the punch seat 12 moves down, the side forming baffle 31 blocks the pressure plate 11 from moving down further. At this time, the second spring 15 is compressed, and the second guide rod extends relative to the punch seat. When the punch seat 12 moves up, the second spring pushes the pressure plate to move down relative to the punch seat to reset, until it is hung on the punch seat 12 by the limiting block 16. The second spring 15 not only plays a resetting role, but also its elasticity keeps the pressure plate and the side forming baffle pressed together.

[0058] The side forming mold 6 includes a forming mold base 62 and a forming punch 61. The bottom surface of the forming punch 61 fits into the support plate. The side surface of the forming punch cooperates with the left baffle 311, right baffle 313, front baffle 314, and rear baffle 312 for forming the side surface 93 of the paper box. The forming punch 61 moves up and down relative to the forming die 3 at the side forming station. After the forming die 3 completes the forming of the paper box tongue and the upper surface of the paper box, it moves to the side forming station 103. The forming punch 61 moves down and pushes the support plate down. The bottom surface 92 of the paper box moves down together under the clamping of the forming punch and the support plate. The side surface 93 of the paper box is blocked by the side forming baffle 31 and folds upward along the fold line 95 of the bottom edge of the paper box, covering the outside of the forming punch 61 and entering the cavity enclosed by the side forming baffle 31, thus realizing the forming of the side surface 93 of the paper box. The lower support plate 33 is provided with a third suction box component 39, which absorbs the paper card during side forming to prevent it from moving and improve the forming accuracy of the paper box.

[0059] The small tongue 91 of the cardboard box is used to connect to the side 93 of the cardboard box. When the side of the cardboard box is formed, the side with the small tongue is formed first, and the side that is bonded to the small tongue is formed later. In this way, the small tongue must be inside the side that is formed later. If all four sides of the cardboard box are formed at the same time, the side that is not connected to the small tongue will collide with the small tongue, resulting in the failure of the side forming of the cardboard box. To solve this problem, taking the front side 934 and the rear side 932 of the cardboard box connected to the small tongue as an example, the upper section of the inner side of the left baffle 311 and the right baffle 313 is provided with a first clearance surface 315, which includes an inclined surface and an arc surface. During the side forming process, the front side 934 and rear side 932 of the cardboard box are formed earlier than the left side 931 and right side 933. That is, the front side 934 and rear side 932 of the cardboard box are folded upward first, and the small tongue integrated with the front side 934 and rear side 932 is inside the left side 931 and right side 933. Then, the left side 931 and rear side 932 of the cardboard box are folded upward to cover the small tongue, and the two are glued together to keep the cardboard box in the side forming state.

[0060] The side of the small tongue block 32 facing the lower support plate 33 is a folded tongue surface. The upper section of the folded tongue surface is provided with a second clearance curved surface 321, so that the small tongue after folding upwards is slightly tilted outwards, rather than completely vertical. If the small tongue 91 of the cardboard box is completely vertical, the small tongue will collide with the forming punch 61 during side forming. When the small tongue is tilted outwards, when the side of the cardboard box is folded upwards along the bottom edge fold line 95, the small tongue and the forming punch 61 are misaligned and smoothly cover the side of the forming punch, so that the side of the cardboard box 93 is smoothly formed. The bottom surface of the forming punch is provided with a second suction box member 63. The forming punch 61 moves upwards and suctions the formed cardboard box, moves the cardboard box out, moves the over-folding lower die to the side forming station, and then puts the formed cardboard box on the over-folding lower die. The over-folding lower die sends the formed cardboard box to the cardboard box output station 104.

[0061] The over-folding lower mold 7 includes an over-folding mold base 71 and an interference-fit folding plate 72. The interference-fit folding plate is disposed on the upper surface of the over-folding mold base. The interference-fit folding plate 72 includes a left folding plate, a right folding plate, and a rear folding plate. The top of the left folding plate, the right folding plate, and the rear folding plate are pointed ridges 521, and their outer surfaces are downward and outward inclined slopes. The left folding plate, the right folding plate, and the rear folding plate together form a carton cavity for placing the formed carton. The over-folding lower mold is not only used for transferring the formed carton, but also for the interference folding of the upper surface of the carton. At the pre-forming station 102, the upper surface 94 of the carton is folded downward relative to the side surface 93 of the carton, that is, folded at a 90-degree angle. However, the upper surface 94 of the carton will spring back after folding, which will affect subsequent packaging and sealing operations. After the upper surface of the carton springs back after interference folding, it is approximately 90 degrees to the side surface of the carton, which meets the subsequent production requirements. The over-folding lower mold 7 is provided with a fifth suction box component 73. When the forming punch 61 moves up and resets, the fifth suction box component 73 will absorb the paper box and prevent the paper box from shifting.

[0062] The lining forming mechanism includes an upper lining mold 4 and a lower lining mold 5. The upper lining mold 4 includes an lining mold base 41, and a forming groove 44 is provided in the middle of the lining mold base 41. The lower lining mold 5 includes a lower mold base 51 and a forming insert plate 52. The forming insert plate is disposed on the lower mold base, and the top of the forming insert plate 52 is a pointed ridge 521, and the vertical cross-section of the forming insert plate is an isosceles triangle. At the lining forming station 106, the lining mold base and the lower mold base are pressed together, and the forming insert plate 52 is inserted into the forming groove 44. The edges 46 on both sides of the forming groove are aligned with the bottom edges 522 on both sides of the forming insert plate on the lower mold base. The top of the forming insert plate cooperates with the inner lining mold base to press the inner lining card into the forming groove 44, folding it along the center fold line 98 and inserting it into the forming groove. The folded inner lining card 100 covers the two sides of the forming insert plate and the surface of the lower mold base. The inner lining mold base is pressed with the lower mold base, and the forming insert plate is inserted into the forming groove. The edges 46 on both sides of the forming groove are pressed with the bottom edges 522 on both sides of the forming insert plate on the lower mold base and are pressed against the two bottom fold lines 99 of the inner lining card, so that the lower end of the inner lining card is folded to both sides along the bottom fold line to form the left bottom plate 1001 and the right bottom plate 1002. The left bottom plate and the right bottom plate are used to bond to the bottom surface of the paper box.

[0063] To improve the bottom folding quality of the inner lining card 100, the inner lining lower mold 5 also includes a left limiting block and a right limiting block 54 that are raised and lowered relative to the lower mold base. The left limiting block and the right limiting block are arranged on both sides of the forming insert plate 52, and the distance from the left limiting block to the left bottom edge of the forming insert plate on the lower mold base is the same as the width of the left bottom plate 1001 of the card, and the distance from the right limiting block to the right bottom edge of the forming insert plate on the lower mold base is the same as the width of the right bottom plate 1002 of the card. The lower mold base 51 is provided with a first through hole for the left limiting block and the right limiting block to pass through. The inner lining mold base 41 moves down, and the folded inner lining card 100 covers the surface of the forming insert plate and the lower mold base 51. The left and right limiting blocks move up and pass through the first through hole, blocking the bottom of the inner lining card 100 and keeping it between the left and right limiting blocks to assist in the forming of the left and right bottom plates. This ensures that the inner lining card is folded along the bottom fold line 99 to form the left and right bottom plates. The bottom fold line matches the bottom edges 522 of the forming insert plate on both sides of the lower mold base. The folded inner lining card 100 covers the surface of the lower mold base between the left and right limiting blocks and the outside of the forming insert plate 52.

[0064] The lower mold base is equipped with a left suction component and a right suction component 53, which respectively adsorb the left and right bottom plates. The left suction component, the right suction component, the left limiting block, and the right limiting block are mounted on a lifting plate 55. The lifting plate moves up and down relative to the lower mold base. The lower mold base has a second through hole for the left and right suction components to pass through. The lifting plate 55 moves up and down, causing the left suction component, the right suction component 53, the left limiting block, and the right limiting block to move up and down together. The lifting plate 55 can be driven by a cylinder. During the molding of the lining, the left and right suction components move upward, and the lining mold base provides rigid support. The two work together to ensure that the left and right suction components press against and adsorb the left and right bottom plates of the lining being molded. In this way, when the upper mold of the lining moves upward, the molded lining will not be carried away or shifted, preparing for the subsequent assembly of the lining.

[0065] To further reduce production costs, the inner lining upper mold 4 is used for both inner lining forming and picking up the inner lining card 100. A second paper suction component 45 is installed on the inner lining mold base, and the second paper suction component is located on both sides of the forming groove 44. At the inner lining forming station, when the inner lining card is about to contact the forming insert plate, the second paper suction component releases the inner lining card to prevent deformation or damage to the second paper suction component and the inner lining card. At the same time, the forming insert plate cooperates with the inner lining mold base to press the card, causing it to fold and form. The upper mold 4 of the inner lining is mounted on the second swing frame 22. The second swing frame drives the upper mold 4 of the inner lining to switch between the inner lining material picking station 105 and the inner lining forming station 106. At the inner lining material picking station, the upper mold of the inner lining faces the inner lining material rack 24. The forming groove 44 is aligned with the center fold line 98 of the inner lining card, and the upper mold 4 of the inner lining moves relative to the inner lining material rack. At the inner lining forming station 106, the upper mold 4 of the inner lining moves up and down relative to the lower mold 5 of the inner lining, so that the forming insert 52 is aligned with the center fold line 98 of the inner lining card.

[0066] To eliminate interference between the inner liner mold base and the left and right limiting blocks, and to reduce the weight of the inner liner mold base, the inner liner mold base includes a pressing part 411 and a mounting part 412. The pressing part and the mounting part can be an integral structure or detachable. The pressing part presses against the lower mold base, and the forming groove 44 is disposed in the pressing part 411. The second paper suction member 45 is mounted on the mounting part 412 and disposed on both sides of the pressing part. At the inner liner forming station, the pressing part is vertically projected onto the lower mold base, and it is located between the left and right limiting blocks. The inner lining mold base moves downward, and the pressing part presses against the lower mold base between the left and right limiting blocks. The left and right suction components are located between the left and right limiting blocks and correspond to the formed left and right bottom plates. The left and right suction components press against the pressing part, which provides support for the left and right suction components, enabling them to absorb the left and right bottom plates. The inner lining card is usually composed of two or more layers of face paper. When the inner lining card is folded, the inner and outer face papers stretch differently. If the pressing part is pressed tightly against the lower mold base, the inner lining bottom plate will be subjected to a large pressure, and wrinkles will appear in the formed inner lining. To solve this problem, the bottom surfaces of the pressing part are chamfered on both sides, or the bottom surface of the pressing part is grooved to reduce the contact area between the pressing block and the inner lining, reduce friction, and improve the forming effect of the inner lining.

[0067] The pressing and bonding mold 8 includes a pressing and bonding mold base 81, which is provided with a clearance groove 85 and an inner lining adsorption member 84 on its bottom surface. The pressing and bonding mold reciprocates between the inner lining output station 107 and the paper box output station 104. The lower inner lining mold 5 delivers the formed inner lining to the inner lining output station 107. The pressing and bonding mold adsorbs the formed inner lining through the inner lining adsorption member 84 at the inner lining output station and then delivers it to the paper box output station, where the inner lining is placed into the formed paper box and pressed against the folding mold base, so that the left and right bottom plates of the inner lining are bonded to the upper surface of the bottom of the paper box. The bottom surface of the pressing and bonding mold base 81 is also provided with a fourth suction box component 83. After the inner liner is bonded to the paper box, the fourth suction box component 83 adsorbs the bottom surface 92 of the paper box and moves it upward, so that the paper box is removed from the mold. At this time, the inner liner adsorption component 84 can also adsorb the inner liner at the same time. A conveyor belt is provided below the over-folding lower mold. When the over-folding lower mold 7 leaves the paper box output station 104, the fourth suction box component blows air, and the paper box with the inner liner is removed from the pressing and bonding mold and falls to the conveyor belt below, where it is sent out.

[0068] The pressing and bonding mold also includes a folding tongue plate 82, which includes a left tongue plate, a right tongue plate, and a rear tongue plate, and respectively folds and engages with the outer sides of the left, right, and rear folding plates. During the bonding process between the liner and the cardboard box, the folding tongue plate 82 presses down on the upper surface 94 of the cardboard box, causing the upper surface 94 of the cardboard box to fold downwards, so that the angle between the upper surface 94 of the cardboard box and the side is less than 90 degrees. After the cardboard box is removed from the mold, the upper surface 94 of the cardboard box will spring back, and after the folded upper surface 94 of the cardboard box springs back, it is approximately at a 90-degree angle with the side 93 of the cardboard box, which meets the subsequent production requirements.

[0069] The first swing frame 21 is rotatably mounted on the machine frame via a rotating shaft 2. A drive component 25 for driving the rotating shaft is installed on the machine frame. The rotating shaft is positioned at the balance point of the swing weight of the first swing frame 21, for example, at the pre-forming station 102. The weight above and below the rotating shaft is balanced, so the swing of the first swing frame 21 is stable. If one side is heavier and the other side is lighter, the first swing frame 21 will shake when swinging, resulting in a short service life and inaccurate positioning after swinging.

[0070] The drive component 25 can be a servo motor. To reduce costs and further improve the stability of the rotating shaft, the drive component 25 includes a first cylinder 251, a linear guide rail 255, a synchronous belt 256, and synchronous pulleys 252. Several synchronous pulleys are provided, rotatably mounted on the frame, with one pulley mounted on the rotating shaft 2. The synchronous belt 256 is disposed on the synchronous pulleys and includes a transmission section. The linear guide rail 255 and the first cylinder 251 are mounted on the frame, and the piston rods of both the linear guide rail and the first cylinder are parallel to the synchronous belt of the transmission section. A slider 254 is provided on the linear guide rail, and the slider is connected to the synchronous belt of the transmission section. The piston rod of the first cylinder is connected to the slider 254. (See attached image) Figure 14 When the piston rod of the first cylinder extends, the slider moves forward along the linear guide rail, and the transmission section of the synchronous belt moves forward, causing the synchronous pulley and the rotating shaft to rotate counterclockwise. The first swing frame 21 swings downward, and the preforming mold 1 swings to the preforming station 102. Conversely, when the piston rod of the first cylinder retracts, the transmission section of the synchronous belt moves backward, the rotating shaft rotates clockwise, and the first swing frame 21 and the preforming mold 1 swing to the material picking station. To ensure accurate positioning of the preform mold 1, the slider is equipped with a first limiting block 257 and a second limiting block 253. The stroke of the first cylinder is greater than the stroke of the slider moving between the first and second limiting blocks. That is, when the piston rod of the first cylinder extends, it drives the slider forward until it is blocked by the first limiting block 257. At the first limiting block, the preform mold 1 is in the preforming station 102. Similarly, when the piston rod of the first cylinder retracts, it drives the slider backward until it is blocked by the second limiting block 253. At the second limiting block, the preform mold 1 is in the material handling station. The positions and spacing of the first and second limiting blocks can be adjusted according to the relative positions of the material handling station and the preforming station 102, allowing the preform mold 1 to switch between the material handling station and the preforming station 102.

[0071] To further stabilize the swing of the first swing frame 21, the drive component 25 is provided with two sets, left and right. The two sets of drive components synchronously drive the first swing frame 21 to swing. Even if the left-right span of the first swing frame 21 is large, the two sets of drive components driving left and right respectively can still stabilize the swing of the first swing frame 21, and this method is less expensive than using a servo motor. A second cylinder 17 is installed on the first swing frame 21 to drive the pre-forming mold 1 to move. The piston rod of the second cylinder 17 is connected to the pre-forming mold 1, and the second cylinder 17 drives the pre-forming mold 1 to move linearly relative to the first swing frame 21 to perform paper card or cardboard box forming operations. The second swing frame 22 can also use the above-described structure for swinging.

[0072] The working principle of the preferred embodiment is further explained below with reference to the accompanying drawings: The paper card 9 and the inner lining paper card 100 have creases. The paper card has a small tongue fold line 97, an upper surface fold line 96, and a bottom edge fold line 95. The area between the bottom edge fold line 95 and the upper surface fold line 96 forms the side surface 93 of the paper box. The four small tongues 91 of the paper card are connected to the two sides of the front side 934 and the rear side 932 respectively, and are also connected to the left side 931 and the right side 933 through the small tongues, so that the paper box maintains its formed state. The inner lining paper card 100 has a center fold line 98 and a bottom fold line 99.

[0073] Paper card 9 and inner lining paper card 100 are placed in paper card rack 23 and inner lining rack 24 respectively. The two racks are set downwards with the discharge port at the lowest point. When the first cylinder 251 is in the retracted state, the pre-forming mold 1 is at the material picking station 101, and the punch seat 12 faces the paper card holder 23. The second cylinder 17 drives the punch seat 12 to move towards the paper card holder 23. The first paper suction component 18 sucks up the paper card at the outlet. Then, the piston rod of the second cylinder 17 retracts, and the first paper suction component returns to its original position with the paper card. The paper card is removed from the paper card holder 23, and the material picking is completed. Afterward, the piston rod of the first cylinder extends and pushes the slider 254 to move along the linear guide rail 255. The slider pulls the synchronous belt 256 to move, causing the synchronous wheel and the rotating shaft 2 to rotate counterclockwise until the slider is blocked by the first limit block 257. The first swing frame 21 swings down to the pre-forming station 102. In the initial state, the upper surfaces of the lower support plate 33 and the side forming baffle 31 are at the same height, and the small tongue block 32 is higher than the lower support plate 33 and the side forming baffle. The first paper suction element 18 faces the forming die 3 directly below. The second cylinder 17 drives the punch seat 12 to move downward, that is, the paper card moves down. The small tongue stop 32 blocks the small tongue 91 of the moving paper card, causing it to fold upward along the small tongue fold line 97. As the paper card continues to move down and is placed on the lower support plate 33 and the side forming baffle 31, the small tongue completes the folding along the folding tongue surface. At this time, the angle between the small tongue and the bottom surface of the paper card is slightly greater than 90 degrees. The pre-forming mold 1 continues to move down, and the side forming baffle 31 blocks the pressure plate. The paper card is pressed by the pressure plate 1. The pre-forming mold 1 is clamped and fixed with the side forming baffle 31. The fold line 96 on the upper surface is aligned with the outer edge of the side forming baffle 31. The left insert plate 121, right insert plate 123, and rear insert plate 122 move downward relative to the pressure plate 11 and push the upper surface of the paper box to fold along the fold line 96 to form the upper surface 94 of the paper box. The first suction box member 34 absorbs the paper card, the first paper suction member 18 releases the paper card, the pre-forming mold 1 moves upward and resets, and the second spring 15 pushes the pressure plate 11 downward relative to the punch seat 12 and resets. Then, the forming die 3 moves to the side forming station 103, and the over-folding lower mold 7 moves together from the side forming station 103 to the paper box output station 104. When the forming die 3 passes the side gluing member, the side gluing member applies glue to the bonding parts of the left side surface 931 and the right side surface 933 of the paper box. At the side forming station 103, the forming die 3 and the forming punch 61 are opposite each other. The forming punch 61 moves down and the bottom surface of the forming punch 61 presses against the lower support plate 33. The first suction box member 34 releases the paper card. The third suction box member 39 absorbs the paper card. The forming punch 61 pushes the lower support plate 33 to move down relative to the die seat, and the small tongue block 32 moves down with it. The front side 934 and the rear side 932 are folded upward along the bottom edge fold line 95. The small tongue is inserted between the forming punch and the left side 931 and the right side 933. Then the left side 931 and the right side 933 are folded upward. The folded left side 931 and the right side 933 are attached to and bonded with the small tongue to form a paper box with an upper surface.After the cardboard box is folded, the third suction member 39 releases the cardboard box, and the second suction member 63 sucks onto the bottom surface of the cardboard box. The forming punch 61 moves upward and carries the formed cardboard box away from the forming die 3. The first spring 35 pushes the lower support plate 33 and the small tongue block 32 to reset. The forming die 3 moves back to the pre-forming station 102, while the over-folding die 7 moves to the side forming station 103. While the forming die 3 is performing side forming at the side forming station 103, the pre-forming die 1 performs the card picking operation. When the pre-forming die 1 and the forming die 3 are pressing together, the side forming die 6 places the formed cardboard box onto the over-folding die holder of the over-folding die. Then, the over-folding die 7 moves again to the cardboard box output station 104. When the over-folding die 7 passes the bottom adhesive component, the bottom adhesive component applies adhesive to the bonding area of ​​the bottom surface 92 of the cardboard box.

[0074] On the other hand, after the upper mold 4 picks up the material at the inner lining picking station 105, it swings to the inner lining forming station 106. The upper mold 4 is directly above the lower mold. The upper mold 4 moves downward and presses against the lower mold 5. The inner lining card 100 is folded along the center fold line 98 and along the bottom fold line 99 to form the left bottom plate 1001 and the right bottom plate 1002. The left suction component and the right suction component attract the left bottom plate and the right bottom plate. The upper mold moves upward and resets. Then the lower mold 5 moves to the inner lining output station 107. At the liner output station 107, the pressing and sticking mold is directly facing the lower liner mold 5. The pressing and sticking mold 8 moves downward, and the forming insert 52 enters the clearance groove 85. The liner adsorption member 84 adsorbs the left and right bottom plates. The pressing and sticking mold moves upward to detach the formed liner from the lower liner mold 5. Then, the pressing and sticking mold moves to the carton output station 104. The pressing and sticking mold moves downward to send the liner into the carton. The bottom surface of the pressing and sticking mold base 81 presses against the over-folding mold base 71, so that the left and right bottom plates of the liner are aligned with the liner. The bottom of the cardboard box is firmly bonded. The over-folding tongue plate 82 cooperates with the interference folding plate 72 to press down the upper surface 94 of the cardboard box so that the angle between it and the side is less than 90 degrees. The fourth suction box component 83 adsorbs the bottom surface 92 of the cardboard box. The pressing and sticking mold 8 moves upward, and the cardboard box leaves the over-folding lower mold 7. The over-folding lower mold 7 moves again to the side forming station 103. The fourth suction box component blows air, and the cardboard box falls off the pressing and sticking mold onto the conveyor belt below. The conveyor belt sends out the cardboard box with the inner lining.

Claims

1. A paper box forming machine, characterized in that: The device includes a paper box forming mechanism, which includes a pre-forming mold, a side forming mold, and a forming die. The pre-forming mold and the forming die are used for forming the paper box flap and the upper surface, and the side forming mold and the forming die are used for forming the sides of the paper box.

2. The paper box forming machine according to claim 1, characterized in that: The forming die includes a die base, a lower support plate, and a small tongue stop; The die holder includes side forming baffles, which include a left baffle, a right baffle, a front baffle, and a rear baffle, forming a cavity. The lower support plate is disposed within the cavity, and the opposite side forming baffle can be raised and lowered. The small tongue stop has four blocks respectively set at the four corners of the side forming baffle. The small tongue stop is higher than the lower support plate and the side forming baffle at least when the tongue is folded.

3. The paper box forming machine according to claim 2, characterized in that: The die holder includes a support plate, which is disposed below the lower support plate. A first spring is provided between the lower support plate and the support plate to reset the lower support plate. In the initial state, the upper surfaces of the lower support plate and the side forming baffle are at the same height, and the small tongue block is higher than the lower support plate and the side forming baffle. The small tongue block is installed on the connecting plate, which is located below the support plate. The lower support plate is equipped with a first guide rod, and the support plate has a first guide hole. The lower end of the first guide rod passes through the first guide hole and connects to the connecting plate.

4. The paper box forming machine according to claim 2, characterized in that: The preform mold includes a punch seat and a pressure plate. The punch seat is provided with a left insert plate, a right insert plate and a rear insert plate for forming the upper surface of the paper box. The punch seat moves up and down relative to the die seat in the pre-forming station. The pressure plate is movably installed on the punch seat and moves up and down relative to the punch seat in the pre-forming station. The pressure plate is provided with a small tongue stop relief groove. At the preforming station, the pressure plate is pressed together with the side forming baffle. The left, right and rear insert plates of the punch seat are located outside the left, right and rear baffles of the die seat and cooperate with each other for folding the upper surface of the paper box.

5. The paper box forming machine according to claim 4, characterized in that: The preforming mold is mounted on the first swing frame, which drives the preforming mold to switch between the material picking station and the preforming station. The bottom surface of the pressure plate is provided with a first paper suction element. At the material handling station, the preforming mold faces the paper card holder and moves relative to the paper card holder; at the preforming station, the preforming mold faces the forming die and is directly above the forming die, and moves up and down relative to the forming die. The forming die moves back and forth between the preforming station and the side forming station; At the side forming station, the side forming mold is directly above the forming die, and the side forming mold moves up and down relative to the forming die.

6. The paper box forming machine according to claim 4, characterized in that: The side forming mold includes a forming mold base and a forming punch, and the bottom surface of the forming punch matches the support plate. The side of the forming punch cooperates with the left baffle, right baffle, front baffle, and rear baffle for forming the side of the paper box; The upper surface of the side forming baffle is provided with a first suction box component, and the bottom surface of the forming punch is provided with a second suction box component; The upper section of the inner side surface of both the left and right baffles is provided with a first clearance curved surface; The side of the small tongue block facing the lower support plate is a folded tongue surface, and the upper section of the folded tongue surface is provided with a second clearance curved surface; The forming mold base is provided with a small tongue clearance groove; During the side forming of the cardboard box, the forming mold base is pressed against the side forming baffle.

7. The paper box forming machine according to claim 6, characterized in that: The paper box forming machine also includes an inner liner forming mechanism, which includes an upper inner liner mold and a lower inner liner mold; The inner lining upper mold includes an inner lining mold base, and a forming groove is provided in the middle of the inner lining mold base; The inner lining lower mold includes a lower mold base and a forming insert plate. The forming insert plate is disposed on the lower mold base. The top of the forming insert plate is a pointed ridge line, and the vertical cross section of the forming insert plate is an isosceles triangle. At the lining forming station, the lining mold base and the lower mold base are pressed together, and the forming insert is inserted into the forming groove. The edges on both sides of the forming groove are aligned with the bottom edges on both sides of the forming insert on the lower mold base.

8. The paper box forming machine according to claim 7, characterized in that: The inner lining lower mold also includes a left limiting block and a right limiting block that move relative to the lower mold base. The left limiting block and the right limiting block are arranged on both sides of the forming insert plate. The distance from the left limiting block to the left bottom edge of the forming insert plate on the lower mold base is the same as the width of the left bottom plate of the paper card. The distance from the right limiting block to the right bottom edge of the forming insert plate on the lower mold base is the same as the width of the right bottom plate of the paper card. The lower mold base is provided with a first through hole for the left limiting block and the right limiting block to pass through. The lower mold base is provided with a left suction component and a right suction component that respectively suction the left bottom plate and the right bottom plate. The left suction component, the right suction component, the left limit block and the right limit block are mounted on the lifting plate. The lifting plate moves up and down relative to the lower mold base. The lower mold base is provided with a second through hole for the left suction component and the right suction component to pass through.

9. The paper box forming machine according to claim 8, characterized in that: A second paper suction component is installed on the inner liner mold base, and the second paper suction component is arranged on both sides of the forming groove; The inner liner mold base includes a pressing part and an mounting part. The pressing part is pressed together with the lower mold base. The forming groove is disposed in the pressing part. The second paper suction member is mounted in the mounting part and disposed on both sides of the pressing part. At the lining forming station, the pressing part is vertically projected onto the lower mold base, between the left limiting block and the right limiting block; The bottom surface of the pressing part has chamfered edges on both sides; The inner lining upper mold is mounted on the second swing frame, and the second swing frame drives the inner lining upper mold to switch between the inner lining material taking station and the inner lining forming station. At the lining material picking station, the upper lining mold faces the lining material rack, the forming groove is aligned with the center fold line of the lining card, and the upper lining mold moves relative to the lining material rack. At the lining forming station, the upper lining mold moves up and down relative to the lower lining mold.

10. The paper box forming machine according to claim 6, characterized in that: The paper box forming mechanism also includes a folding die, which includes a folding die base and an interference fit plate. The interference fit plate is disposed on the upper surface of the folding die base and includes a left folding plate, a right folding plate and a rear folding plate. The top of the left folding plate, the right folding plate and the rear folding plate are pointed ridges, and the outer side is a downward and outward inclined surface. The left folding plate, the right folding plate and the rear folding plate together form the paper box cavity. The paper box forming machine also includes an inner liner transfer mechanism, which includes a pressing and sticking mold that moves up and down. The pressing and sticking mold includes a pressing and sticking mold base, which is provided with a clearance groove. The bottom surface of the pressing and sticking mold base is also provided with an inner liner adsorption component. The lower mold of the inner lining moves back and forth between the inner lining forming station and the inner lining output station; The over-folding die moves back and forth between the side forming station and the carton output station; The pressing and bonding mold moves back and forth between the inner liner output station and the carton output station.

11. The paper box forming machine according to claim 10, characterized in that: The pressing and bonding mold is provided with a folding tongue plate, which includes a left tongue plate, a right tongue plate and a rear tongue plate, and respectively folds and cooperates with the outer sides of the left folding plate, the right folding plate and the rear folding plate. The bottom surface of the pressing mold base is also provided with a fourth suction box component; A side gluing component is provided between the preforming station and the side forming station; A bottom adhesive component is provided between the side forming station and the cardboard box output station.

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