Plastic packaging box processing equipment and processing method thereof

Abstract

This invention discloses a plastic packaging box processing equipment and method. This equipment and method softens the plastic sheet at the bending point through hot melting. After softening by heating with a heating rod, the bending is performed directly by a rotating plate. The softened area hardens after cooling. The plastic sheets on both sides of the bending point have high support strength. Furthermore, by elastically deflecting the plastic sheets on both sides of the first inclined surface to adhere to the first inclined surface, guide plates pass through buckles and buckle insertion holes on the plastic sheets. After the mold rises, the plastic sheets on both sides of the first inclined surface return to their original position, and the buckles automatically insert into the buckle insertion holes under the guidance of the guide plates, automatically achieving buckle engagement. This effectively reduces labor intensity and labor costs, and lowers production costs.

Description

Technical Field

[0001] This invention belongs to the technical field of plastic packaging box processing equipment, specifically a plastic packaging box processing equipment and its processing method. Background Technology

[0002] Plastic packaging boxes are made by punching and folding plastic sheets, which includes the following steps: 1) Design a mold for the corresponding plastic folding packaging box according to the product's packaging requirements and design drawings. The mold design needs to consider the position and angle of the folding lines and the final forming effect. 2) Use an injection molding machine or a vacuum forming machine to heat and melt the plastic raw material (such as PP, PET, PVC, etc.), inject it into the mold, and cool and solidify it to produce a plastic sheet with a certain thickness and flatness. 3) Use a punching machine to cut the large plastic sheet according to the shape of the packaging box, and pre-make creases in the corresponding positions through a creasing process. 4) Fold each corner in sequence according to the pre-set creases to form the basic shape of the box. 5) Seal the opening of the box by ultrasonic welding, heat sealing, gluing, etc. If it is a snap-on design, simply insert the corresponding snaps. The plastic packaging box is formed through the above steps. However, the above processing method is prone to damage to the plastic sheet during the pre-pressing crease, resulting in some waste. In addition, the plastic sheet on both sides of the crease of the plastic box folded according to the pre-pressing crease has no supporting strength. Without the support and positioning of other plastic sheets, it is easy to deform or return to a flat state. Moreover, the folding of the box and the alignment of the spigot are generally done manually, resulting in high labor costs and high labor intensity for workers, which increases production costs. Summary of the Invention

[0003] This invention addresses the shortcomings of existing technologies by providing a plastic packaging box processing equipment and method. This equipment and method eliminate the need to press creases into the plastic sheet, effectively preventing damage and waste. The plastic sheet is softened at the bending point through heat melting, allowing for direct bending. The softened area hardens upon cooling, providing high support strength between the plastic sheets on both sides of the bend, preventing deformation or reverting to a flat state even without additional support. Furthermore, the side plate with snap-fit ​​mechanism can be elastically bent to one side and then spring open to automatically insert the snap-fit ​​into its slot, automating engagement and effectively reducing labor intensity and costs, thus lowering production costs.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a plastic packaging box processing equipment, including a machine base, a positioning groove on the machine base, a support frame at the bottom of the positioning groove, a base with a rectangular upper surface fixedly mounted on the support frame, first rotating plates rotatably connected to the support frame on opposite sides of the base, each of the first rotating plates being driven by a first cylinder to fold towards the base; second rotating plates rotatably connected to the support frame on the outer sides of the two first rotating plates, each of the second rotating plates being driven by a second cylinder to fold towards the base; third rotating plates rotatably mounted on the remaining opposite sides of the two first rotating plates, each of the third rotating plates being driven by a third cylinder to fold towards the first rotating plates; and fourth rotating plates rotatably connected to the support frame on the other two opposite sides of the base, each of the fourth rotating plates being driven by a fourth cylinder to fold towards the base. Heating rods are provided between a rotating plate and the base, between the first rotating plate and the second rotating plate, between the second rotating plate and the third rotating plate, and between the base and the fourth rotating plate. A template driven by a fifth cylinder is provided on the base. The template is aligned with the base and matches its shape. The two surfaces of the template facing the first rotating plate are first inclined surfaces that slope inward from bottom to top. Pressing molds driven by a sixth cylinder are provided on both sides of the template. The pressing molds are provided with second inclined surfaces that match the first inclined surfaces. Two guide channels are provided on the two surfaces of the template facing the fourth rotating plate. Elastic elements and movable blocks are provided in the guide channels from the inside to the outside. Guide plates extending out of the template end face and bent in the opposite direction are provided on the two movable blocks on the same side. The guide plates are aligned with the buckles and buckle holes on the plastic sheet folded onto the surface. A receiving groove for accommodating the guide plates is provided on the fourth rotating plate.

[0005] In the above technical solution, preferably, a plurality of horizontally or vertically arranged positioning columns are provided on the base below the support frame, the bottoms of the first cylinder, the second cylinder and the fourth cylinder are respectively rotatably connected to the plurality of positioning columns, and the telescopic rods of the first cylinder, the second cylinder and the fourth cylinder are respectively rotatably connected to the first rotating plate, the second rotating plate and the fourth rotating plate.

[0006] In the above technical solution, preferably, the bottom of the first rotating plate is provided with a first extension arm, the bottom of the third rotating plate is provided with a second extension arm, and the third cylinder is provided between the first extension arm and the second extension arm with its two ends rotatably connected.

[0007] In the above technical solution, preferably, the side of the two molds opposite to the second inclined surface is perpendicular to the first rotating plate and flush with the side of the first rotating plate that is close to the second rotating plate.

[0008] In the unfolded state, the upper surfaces of the first rotating plate, the second rotating plate, the third rotating plate, and the fourth rotating plate are located in the same plane as the upper surface of the base. When folded, the first rotating plate, the second rotating plate, the third rotating plate, and the fourth rotating plate all rotate 85-90°.

[0009] In the above technical solution, preferably, the fifth cylinder and two sixth cylinders are vertically fixed on the base above the base, and the sixth cylinders are located on both sides of the fifth cylinder.

[0010] The processing method of the above-mentioned plastic packaging box processing equipment includes the following steps: 1) Place the cut plastic sheet in the positioning groove, and lower the mold to position the plastic sheet; 2) Heat the plastic sheet with a heating rod to soften the part of the plastic sheet to be bent; 3) Fold the plastic sheet in the following order: the second rotating plate folds the plastic sheet and then resets, the first rotating plate folds the plastic sheet, the third rotating plate folds the plastic sheet and then resets, the first rotating plate resets, and the fourth rotating plate folds the plastic sheet; 4) The heating rod stops heating and waits for the plastic sheet to cool and solidify; 5) The mold lowers to elastically deflect the plastic sheets on both sides of the first inclined surface to fit the first inclined surface, and the guide plate passes through the buckle and buckle insertion hole on the plastic sheet; 6) The mold rises, the plastic sheets on both sides of the first inclined surface reset, and the buckle is inserted into the buckle insertion hole under the guidance of the guide plate; 7) After the fourth rotating plate resets, the mold rises and the folded plastic packaging box is taken out from the mold.

[0011] In the above technical solution, preferably, in steps 2-4, the heating rod starts heating 3-10 seconds before its corresponding rotating plate is folded, and cools down after its corresponding rotating plate is folded.

[0012] In the above technical solution, preferably, the mold descends before the second rotating plate folds the plastic sheet, and returns to its original position after the second rotating plate folds the plastic sheet.

[0013] Compared with existing technologies, this invention has the following advantages: This plastic packaging box processing equipment and method eliminates the need to press creases onto the plastic sheet, effectively avoiding waste caused by plastic sheet breakage. The plastic sheet is softened by hot melting at the bending point, allowing for direct bending after softening. The softened area hardens upon cooling, providing high support strength between the plastic sheets on both sides of the bending point, preventing deformation or reverting to a flat state even without other supporting plastic sheets. Furthermore, by elastically deflecting the plastic sheets on both sides of the first inclined surface to adhere to it, and with guide plates passing through buckles and buckle holes on the plastic sheets, the plastic sheets on both sides of the first inclined surface return to their original position after the die rises. The buckles automatically insert into the buckle holes under the guidance of the guide plates, automatically achieving buckle engagement, effectively reducing labor intensity and labor costs, and lowering production costs. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention.

[0015] Figure 2 This is a schematic diagram of the structure of the second rotating plate after it has been folded in an embodiment of the present invention.

[0016] Figure 3 This is a schematic diagram of the structure of the first and third rotating plates after folding in an embodiment of the present invention.

[0017] Figure 4 This is a schematic diagram of the structure after the rotating plate is folded and the mold is lowered in the fourth embodiment of the present invention.

[0018] Figure 5 This is an exploded structural diagram of an embodiment of the present invention.

[0019] Figure 6 This is a schematic diagram illustrating the process of folding a plastic sheet into a plastic packaging box according to an embodiment of the present invention.

[0020] Figure 7 This is a diagram showing the state of the plastic sheet after the fourth rotating plate is folded and the mold is lowered in an embodiment of the present invention. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments: See below Figures 1 to 7A plastic packaging box processing device includes a base 1, which comprises a top plate, a middle plate, and support legs from top to bottom. A positioning groove 11 is provided on the middle plate of the base 1, and a support frame 12 is provided at the bottom of the positioning groove 11. A rectangular base 121 is fixedly mounted on the support frame 12. First rotating plates 2, rotatably connected to the support frame 12, are provided on opposite sides of the base 121. Each of the first rotating plates 2 can be driven by a first cylinder 21 to fold towards the base 121. Second rotating plates 3, rotatably connected to the support frame 12, are provided on the outer sides of the two first rotating plates 2. Each of the second rotating plates 3 can be driven by a second cylinder 31. The drive mechanism folds the plate towards the base 121. A third rotating plate 4 is rotatably mounted on the other two opposite sides of the two first rotating plates 2. The third rotating plate 4 is hinged to the first rotating plate 2. A first extension arm 22 is mounted at the bottom of the first rotating plate 2, and a second extension arm 42 is mounted at the bottom of the third rotating plate 4. A third cylinder 41 is rotatably connected at both ends between the first extension arm 22 and the second extension arm 42. The third rotating plate 4 can be driven by the third cylinder 41 to fold towards the first rotating plate 2. A fourth rotating plate 5 is mounted on each of the other two opposite sides of the base 121 and rotatably connected to the support frame 12. Each of the fourth rotating plates 5 can be driven by the fourth cylinder 51. The base 1 is folded towards the base 121. Heating rods 6 are provided between the first rotating plate 2 and the base 121, between the first rotating plate 2 and the second rotating plate 3, between the second rotating plate 3 and the third rotating plate 4, and between the base 121 and the fourth rotating plate 5. Each heating rod 6 can be individually controlled for heating. A template 7 driven by a fifth cylinder 71 is provided on the base 1. The template 7 is aligned with the base 121 and its shape matches. The two surfaces of the template 7 facing the first rotating plate 2 are first inclined surfaces 72 that slope from bottom to top towards the inside of the template 7. Pressing molds 8 driven by a sixth cylinder 81 are provided on both sides of the template 7. The pressing molds 8 are provided with the same features as the first rotating plate 2. A second inclined plane 82 matches an inclined plane 72. Two guide channels 73 are provided on the two surfaces of the template 7 facing the fourth rotating plate 5. An elastic element (not shown in the figure) and a movable block 74 are provided inside the guide channel 73 from the inside out. The elastic element is a spring. A limiting ring is provided at the opening of the guide channel 73 to prevent the movable block 74 from disengaging from the guide channel 73. Guide plates 75 are provided on the two movable blocks 74 on the same side, extending out of the end face of the template 7 and bent in the opposite direction. The guide plates 75 are aligned with the buckles 101 and buckle insertion holes 102 on the plastic sheet 100 folded onto this surface. The fourth rotating plate 5 is provided with a receiving groove 52 to accommodate the guide plates 75. This plastic packaging box processing equipment is used to bend the plastic sheet 100 into plastic packaging boxes. This plastic packaging box processing equipment also includes a control device for controlling each cylinder and each heating rod 6.

[0022] In this embodiment, a plurality of horizontally or vertically arranged positioning columns 13 are provided on the base 1 below the support frame 12. The bottoms of the first cylinder 21, the second cylinder 31 and the fourth cylinder 51 are rotatably connected to the plurality of positioning columns 13 respectively. The telescopic rods of the first cylinder 21, the second cylinder 31 and the fourth cylinder 51 are rotatably connected to the first rotating plate 2, the second rotating plate 3 and the fourth rotating plate 5 respectively.

[0023] In this embodiment, the side of the two pressing molds 8 opposite to the second inclined surface 82 is perpendicular to the first rotating plate 2 and flush with the side of the first rotating plate 2 that is close to the second rotating plate 3. The side of the two pressing molds 8 that is perpendicular to the first rotating plate 2 can be used to abut against the plastic sheet 100 when the second rotating plate 3 flips and bends the plastic sheet 100, so that the plastic sheet 100 is bent more neatly.

[0024] In this embodiment, in the unfolded state, the upper surfaces of the first rotating plate 2, the second rotating plate 3, the third rotating plate 4, and the fourth rotating plate 5 are located in the same plane as the upper surface of the base 121. During processing, the plastic sheet 100 is placed above the first rotating plate 2, the second rotating plate 3, the third rotating plate 4, and the fourth rotating plate 5. When folded, the first rotating plate 2, the second rotating plate 3, the third rotating plate 4, and the fourth rotating plate 5 all rotate 85-90°. In this embodiment, the first rotating plate 2, the second rotating plate 3, the third rotating plate 4, and the fourth rotating plate 5 can all be folded 90°.

[0025] In this embodiment, a fifth cylinder 71 and two sixth cylinders 81 are vertically fixed on the top plate of the base 1 above the base 121, with the sixth cylinders 81 located on both sides of the fifth cylinder 71.

[0026] The processing method of the above-mentioned plastic packaging box processing equipment includes the following steps: 1) The cut plastic sheet 100 is placed in the positioning groove 11, and the mold 7 is lowered to position the plastic sheet 100; 2) The heating rod 6 heats the plastic sheet 100 to soften the part to be bent; 3) The plastic sheet 100 is folded in the following order: the second rotating plate 3 folds the plastic sheet 100 and then resets, the first rotating plate 2 folds the plastic sheet 100, the third rotating plate 4 folds the plastic sheet 100 and then resets, the first rotating plate 2 resets, and the fourth rotating plate 5 folds the plastic sheet 100; 4) The heating rod 6 stops heating and waits for the plastic sheet 100 to cool and solidify; 5) The pressing mold 8 is lowered to place the first plastic sheet 100 into the mold. The plastic sheets 100 on both sides of the first inclined surface 72 are elastically deflected towards the first inclined surface 72 and attached to the first inclined surface 72. The elastic element always has the elastic force to push the guide plate 75 out of the side wall of the mold 7. After the plastic sheets 100 on both sides of the first inclined surface 72 are elastically deflected towards the first inclined surface 72, the guide plate 75 passes through the buckle 101 and buckle insertion hole 102 on the plastic sheet 100 and extends into the receiving groove 52; 6) The mold 8 rises, the plastic sheets 100 on both sides of the first inclined surface 72 are reset, and the buckle 101 is inserted into the buckle insertion hole 102 under the guidance of the guide plate 75; 7) After the fourth rotating plate 5 is reset, the mold 7 rises and the folded plastic packaging box is taken out from the mold 7.

[0027] In steps 2-4, the heating rod 6 begins heating 3-10 seconds before its corresponding rotating plate is folded, and cools after the corresponding rotating plate is folded. By individually controlling the heating of the heating rod 6, the heating time can be reduced, heating is only performed before the corresponding rotating plate is folded, and the plastic sheet 100 cools and sets more quickly after folding.

[0028] During processing, the die 8 can be lowered before the second rotating plate 3 folds the plastic sheet 100, and then reset after the second rotating plate 3 folds the plastic sheet 100. This processing step allows the surfaces of the two dies 8 perpendicular to the first rotating plate 2 to abut against the plastic sheet 100 when the second rotating plate 3 folds and bends the plastic sheet 100, making the bending of the plastic sheet 100 more neat.

[0029] This plastic packaging box processing equipment and method eliminates the need to press creases onto the plastic sheet 100, effectively avoiding waste caused by plastic sheet breakage. The plastic sheet is softened by heat melting at the bending point, allowing for direct bending after softening. The softened area hardens upon cooling, providing high support strength between the plastic sheets on both sides of the bend, preventing deformation or return to a flat state even without other supporting plastic sheets. Furthermore, by elastically deflecting the plastic sheets 100 on both sides of the first inclined surface 72 to adhere to it, and with the guide plate 75 passing through the buckle 101 and buckle insertion hole 102 on the plastic sheet 100, the plastic sheets 100 on both sides of the first inclined surface 72 return to their original position after the mold 8 rises. The buckle 101 automatically inserts into the buckle insertion hole 102 under the guidance of the guide plate 75, automatically achieving buckle engagement. This effectively reduces labor intensity and labor costs, and lowers production costs.

[0030] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A plastic packaging box processing equipment, characterized in that: Includes a base (1), on which a positioning groove (11) is provided, and a support frame (12) is provided at the bottom of the positioning groove (11). A base (121) with a rectangular upper surface is fixedly provided on the support frame (12). Each opposite side of the base (121) is provided with a first rotating plate (2) rotatably connected to the support frame (12). Each of the first rotating plates (2) can be driven by a first cylinder (21) to fold towards the base (121). A second rotating plate (3) rotatably connected to the support frame (12) is provided on the outer side of each of the two first rotating plates (2). All of the first rotating plates (2) can be driven by the second cylinder (31) to fold towards the base (121); the other two opposite sides of the first rotating plates (2) are provided with third rotating plates (4), which can be driven by the third cylinder (41) to fold towards the first rotating plates (2); the other two opposite sides of the base (121) are provided with fourth rotating plates (5) rotatably connected to the support frame (12), which can be driven by the fourth cylinder (51) to fold towards the base (121), and the first rotating plates (2) and the base (121) are connected by the first rotating plate (2) to the support frame (12). Heating rods (6) are provided between plate (2) and the second rotating plate (3), between the second rotating plate (3) and the third rotating plate (4), and between the base (121) and the fourth rotating plate (5); a template (7) driven to lift and lower by a fifth cylinder (71) is provided on the base (1). The template (7) is aligned with the base (121) and its shape matches. The two surfaces of the template (7) facing the first rotating plate (2) are first inclined surfaces (72) that slope from bottom to top towards the inside of the template (7). Pressing molds (8) driven to lift and lower by a sixth cylinder (81) are provided on both sides of the template (7). The mold (8) is provided with a second inclined surface (82) that matches the first inclined surface (72). The two surfaces of the template (7) facing the fourth rotating plate (5) are provided with two guide channels (73). The guide channels (73) are provided with elastic elements and movable blocks (74) from the inside to the outside. The two movable blocks (74) on the same side are provided with guide pieces (75) that extend out of the end face of the template (7) and bend in the opposite direction. The guide pieces (75) are aligned with the buckles and buckle holes on the plastic sheet folded onto the surface. The fourth rotating plate (5) is provided with a receiving groove (52) for accommodating the guide pieces (75).

2. The plastic packaging box processing equipment as described in claim 1, characterized in that: The base (1) is provided with a plurality of horizontally or vertically arranged positioning columns (13) below the support frame (12). The bottoms of the first cylinder (21), the second cylinder (31) and the fourth cylinder (51) are rotatably connected to the plurality of positioning columns (13). The telescopic rods of the first cylinder (21), the second cylinder (31) and the fourth cylinder (51) are rotatably connected to the first rotating plate (2), the second rotating plate (3) and the fourth rotating plate (5) respectively.

3. The plastic packaging box processing equipment as described in claim 1, characterized in that: The bottom of the first rotating plate (2) is provided with a first extension arm (22), and the bottom of the third rotating plate (4) is provided with a second extension arm (42). The third cylinder (41) is rotatably connected at both ends between the first extension arm (22) and the second extension arm (42).

4. The plastic packaging box processing equipment as described in claim 1, characterized in that: The side of the two molds (8) opposite to the second inclined surface (82) is perpendicular to the first rotating plate (2) and flush with the side of the first rotating plate (2) that is close to the second rotating plate (3).

5. The plastic packaging box processing equipment as described in claim 1, characterized in that: In the unfolded state, the upper surfaces of the first rotating plate (2), the second rotating plate (3), the third rotating plate (4), and the fourth rotating plate (5) are located in the same plane as the upper surface of the base (121). When folded, the first rotating plate (2), the second rotating plate (3), the third rotating plate (4), and the fourth rotating plate (5) all rotate 85-90°.

6. The plastic packaging box processing equipment as described in claim 1, characterized in that: The fifth cylinder (71) and two sixth cylinders (81) are vertically fixed on the base (1) above the base (121), with the sixth cylinders (81) located on both sides of the fifth cylinder (71).

7. A processing method for a plastic packaging box processing equipment as described in any one of claims 1-6, characterized in that, Includes the following steps: 1) Place the cut plastic sheet in the positioning groove (11), and lower the mold (7) to position the plastic sheet; 2) Heat the plastic sheet with the heating rod (6) to soften the part of the plastic sheet to be bent; 3) Fold the plastic sheet in the following order: the second rotating plate (3) folds the plastic sheet and then resets, the first rotating plate (2) folds the plastic sheet, the third rotating plate (4) folds the plastic sheet and then resets, the first rotating plate (2) resets, and the fourth rotating plate (5) folds the plastic sheet; 4) The heating rod (6) stops heating, and waits for the plastic sheet to soften. 5) The mold (8) descends to elastically deflect the plastic sheets on both sides of the first inclined surface (72) to fit the first inclined surface (72), and the guide plate (75) passes through the buckle and buckle insertion hole on the plastic sheet; 6) The mold (8) rises, the plastic sheets on both sides of the first inclined surface (72) are reset, and the buckle is inserted into the buckle insertion hole under the guidance of the guide plate (75); 7) After the fourth rotating plate (5) is reset, the template (7) rises and the folded plastic packaging box is taken out from the template (7).

8. The processing method of the plastic packaging box processing equipment as described in claim 7, characterized in that, In steps 2-4, the heating rod (6) starts heating 3-10 seconds before its corresponding rotating plate is folded, and cools down after its corresponding rotating plate is folded.

9. The processing method of the plastic packaging box processing equipment as described in claim 7, characterized in that, Before the second rotating plate (3) folds the plastic sheet, the mold (8) descends and returns to its original position after the second rotating plate (3) folds the plastic sheet.

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