Packaging box forming device and method

Abstract

The invention provides a packaging box forming device and method, and relates to the technical field of packaging box production. The packaging box forming device comprises a machine table, a forming die and a negative pressure pump. According to the device, after a packaging box material is sucked into the mold cavity to be attached, the position is continuously changed through the slowly-rotating ejector block, protrusions formed at the bottom of a packaging box due to negative pressure are smoothed, the problem of protrusions of the packaging box is effectively solved, and the quality of a finished product of the packaging box is improved; certain pre-pressing can be formed on the contact range of the bottom of the packaging box and the ejector block through the ejector block, and appearance difference between the position and other packaging boxes which are not adsorbed by air suction after forming is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of packaging box production, and specifically relates to a packaging box forming device and a forming method. Background Art

[0002] A forming machine refers to a special equipment that automatically completes unpacking, forming, bottom folding leaf bending, and simultaneously completes the pasting of the lower part of the tape. It opens the box board stacked into cardboard, folds the bottom of the box according to a certain procedure, and seals it with tape and then conveys it to the packing machine; among them, the development space and application of the packaging box forming machine are relatively extensive. In daily life, the market shares of cigarettes, wines, foods, medicines, small household appliances, cosmetics, etc. are getting larger and larger, and all need delicate packaging boxes. Therefore, the packaging box forming machine has good development space. Among them, a plastic blister packaging box is a plastic product produced by the plastic blister process. Its production process is to process the softened packaging material by using a plastic blister packaging box forming machine, and use vacuum adsorption to make the packaging material adhere to the surface of the mold, and then cool and form. However, during the processing, convex marks often appear on the surface of the plastic blister packaging box at the vacuum pumping pipeline of the mold. On the one hand, it reduces the packaging quality of the packaging box, and on the other hand, it has a certain impact on the appearance of the packaging box.

[0003] For this reason, there is a disclosed technology that proposes a packaging box forming machine, including a machine table, a vacuum pump and a controller. A mold cavity is provided at the top of the machine table, a vacuum pumping pipeline is provided at the bottom of the mold cavity, a first notch is provided on the side wall at the top of the vacuum pumping pipeline, a slide plate is provided in each of the first notches, a cavity is provided on the side wall at the bottom of the vacuum pumping pipeline, a rotating plate is installed on the side wall of the cavity, an elastic airbag is installed on the top of the rotating plate, and when the rotating plate rotates, it pushes the slide plate to slide in the first notch by squeezing the airbag, so as to use the slide plate to lift and flatten the raised part of the packaging material, increasing the usability and aesthetics of the plastic blister packaging box; an elastic plate is provided on the top of the slide plate, and the elastic plates are bent and deformed by mutual extrusion to squeeze the middle part of the raised packaging box, thereby reducing the convex marks appearing on the surface of the packaging box and further enhancing the usability and aesthetics of the plastic blister packaging box; However, there are obvious drawbacks in the use of the above-mentioned disclosed technology. One is that the airflow generated by the vacuum pump can only push the rotating plate to rotate, and cannot form a force to squeeze the airbag through the rotating plate. Moreover, its slide plate structure cannot smooth the convexity formed by the suction of the packaging box, but will instead form indentations. Therefore, it is necessary to improve and optimize the packaging box forming device and the forming method. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention provides a packaging box forming device and a forming method, which solve the problems existing in the packaging box forming device and the forming method in the prior art that the airflow generated by the air extraction of the vacuum pump can only drive the rotating plate to rotate but cannot form a force to squeeze the airbag through the rotating plate, and the problem that the skateboard structure cannot smooth the protrusions formed by the air suction of the packaging box but will instead form indentations.

[0005] To achieve the above objectives, the present invention is realized through the following technical solutions: A packaging box forming device includes a machine table, a forming die, and a negative pressure pump. A maintenance door is rotatably connected to the front wall of the machine table, and a heat dissipation window is provided on the side wall of the machine table. The forming die is arranged on the upper wall of the machine table, and the lower end of the forming die penetrates through the machine table and extends into the interior of the machine table. The negative pressure pump is fixedly connected to the inner lower wall of the machine table and is close to the left wall position. A mold cavity is provided on the upper wall of the forming die, and four groups of through holes are provided on the inner lower wall of the mold cavity. The inner side walls of the four groups of through holes are all slidably connected with top blocks. A connecting pipe is fixedly connected to the lower end of the top block. The inner lower wall of the machine table is slidably connected with a negative pressure box through a lifting drive structure. The negative pressure pump is connected to the interior of the negative pressure box through an air pipe. A rotating seat is provided on the upper wall of the negative pressure box. One end of the connecting pipe away from the top block is rotatably connected to the inner side wall of the rotating seat. The end of the connecting pipe facing the rotating seat sequentially penetrates through the inner wall of the rotating seat and the upper wall of the negative pressure box and extends into the interior of the negative pressure box. A rotating drive structure for driving the connecting pipe to rotate is provided on the upper wall of the negative pressure box. An electric control exhaust valve for relieving the negative pressure state in the negative pressure box is fixedly connected to the side wall of the negative pressure box.

[0006] Preferably, multiple groups of irregularly distributed air suction holes are provided on the inner wall of the top block, and the multiple groups of air suction holes are all communicated with the upper wall and the lower wall of the top block. A ventilation hole that penetrates up and down is provided on the inner wall of the connecting pipe. The interior of the negative pressure box is communicated with the interior of the mold cavity through the ventilation hole and the multiple groups of air suction holes.

[0007] Preferably, arc chamfers are provided on the upper edges of the multiple groups of air suction holes and the outer edge of the upper end of the top block.

[0008] Preferably, the top block is made of polytetrafluoroethylene.

[0009] Preferably, the lifting drive structure includes a cylinder and a push plate. The cylinder is fixedly connected to the inner lower wall of the machine table, the push plate is fixedly connected to the end of the cylinder's extending shaft, and the upper wall of the push plate is fixedly connected to the lower wall of the negative pressure box.

[0010] Preferably, the rotating drive structure includes a right-angle reducer, a driving motor, and a rotating shaft. The right-angle reducer is fixedly connected to the upper wall of the negative pressure box, the driving motor is fixedly connected to the input end of the right-angle reducer and the output shaft of the driving motor is fixedly connected to the input shaft of the right-angle reducer. The rotating shaft is fixedly connected to the end of the output shaft of the right-angle reducer and the axis of the rotating shaft is parallel to the axis of the connecting pipe.

[0011] Preferably, the rotating shaft and the connecting pipe are meshed and driven by two sets of synchronous pulleys and one set of synchronous belts.

[0012] Preferably, seals for sealing are provided between the top block and the inner side wall of the through hole, and between the connecting pipe and the rotating seat.

[0013] According to the forming method of the packaging box forming device described above, the forming method includes the following steps: S1. Attach the packaging material softened by high temperature to the forming die on the upper side of the machine table, start the negative pressure pump, the negative pressure pump extracts the air in the negative pressure box, and sucks away the air in the mold cavity through the ventilation holes and multiple suction holes, so that the air pressure between the mold cavity and the packaging material decreases, and the packaging material is squeezed tightly inside the mold cavity by the external air pressure until the packaging material is completely sucked and covered on the inner surface of the mold cavity, thereby obtaining the shape of the packaging box; S2. When the packaging material is completely attached to the inner surface of the mold cavity, in order to prevent the lower surface of the packaging material from being sucked into a convex shape by the negative pressure, the extending shaft of the cylinder extends a certain distance, driving the top block to protrude from the lower wall inside the mold cavity, and start the driving motor. When the driving motor rotates, it is decelerated by a right-angle reducer, and then drives the rotating shaft to rotate. The rotating shaft drives the connecting pipe to rotate through two sets of synchronous pulleys and one set of synchronous belts, and then drives the top block to rotate slowly. While the top block rotates slowly, the position where the suction hole contacts the packaging material is switched, and the convex part sucked by the suction hole is flattened by the solid position on the upper wall of the top block; S3. After the packaging box is formed, turn off the negative pressure pump, retract the extending shaft of the cylinder, open the electric control exhaust valve, and fill the negative pressure box with air through the external air pressure, so that the negative pressure adsorption state between the packaging box and the mold cavity is released, facilitating the removal of the packaging box.

[0014] The present invention provides a packaging box forming device and a forming method, having the following beneficial effects: Compared with the prior art, in this packaging box forming device and forming method, after sucking the packaging box material into the mold cavity and fitting it, the convexity formed at the bottom of the packaging box due to the negative pressure is smoothed by continuously changing the position of the slowly rotating top block, effectively solving the problem of the convexity of the packaging box and improving the quality of the finished packaging box.

[0015] Compared with the prior art, in this packaging box forming device and forming method, by driving the top block to rise by the cylinder, a certain pre-pressure can be formed on the range where the bottom of the packaging box contacts the top block, avoiding the appearance difference between this position and the surface of the packaging box that is not adsorbed by suction after forming. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of the present invention; Figure 2 For the present invention Figure 1 Local enlarged view of part A in Figure 3 This is a partial cross-sectional view of the internal structure of the machine platform and the molding die of the present invention; Figure 4 For the present invention Figure 3 A partial enlarged view at position B in the present invention; Figure 5 For the present invention Figure 3 A partial enlarged view at position C in the present invention; Figure 6 This is a partial cross-sectional view of the connection structure of the ejector block and the connecting pipe of the present invention.

[0017] Among them, 1. Machine platform; 2. Molding die; 3. Mold cavity; 4. Maintenance door; 5. Heat dissipation window; 6. Ejector block; 7. Suction hole; 8. Negative pressure pump; 9. Cylinder; 10. Push plate; 11. Negative pressure box; 12. Air pipe; 13. Rotating seat; 14. Connecting pipe; 15. Electric control exhaust valve; 16. Driving motor; 17. Right-angle reducer; 18. Rotating shaft; 19. Synchronous belt; 20. Synchronous pulley; 21. Sealing member; 22. Ventilation hole. Specific embodiments

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. Embodiment

[0019] As Figures 1 to 6 shown, the embodiment of the present invention provides a packaging box forming device, including a machine platform 1, a molding die 2 and a negative pressure pump 8. A maintenance door 4 is rotatably connected to the front wall of the machine platform 1, a heat dissipation window 5 is arranged on the side wall of the machine platform 1, the molding die 2 is arranged on the upper wall of the machine platform 1, the lower end of the molding die 2 penetrates through the machine platform 1 and extends into the interior of the machine platform 1, and the negative pressure pump 8 is fixedly connected to the inner lower wall of the machine platform 1 and close to the left wall position; In order to facilitate the smooth suction of the packaging material into the mold cavity 3, a mold cavity 3 is arranged on the upper wall of the molding die 2. Four groups of through holes are arranged on the inner lower wall of the mold cavity 3. The inner side walls of the four groups of through holes are all slidably connected with an ejector block 6. The lower end of the ejector block 6 is fixedly connected with a connecting pipe 14. A plurality of groups of suction holes 7 distributed irregularly are arranged on the inner wall of the ejector block 6. The plurality of groups of suction holes 7 are all communicated with the upper wall and the lower wall of the ejector block 6. A vertically through ventilation hole 22 is arranged on the inner wall of the connecting pipe 14. The interior of the negative pressure box 11 is communicated with the interior of the mold cavity 3 through the ventilation hole 22 and the plurality of groups of suction holes 7. When the negative pressure pump 8 works, the air inside the negative pressure box 11 is sucked away, and the air inside the mold cavity 3 is sucked away through the ventilation hole 22 and the plurality of groups of suction holes 7, and then the packaging material is squeezed into the mold cavity 3 under the action of the external atmospheric pressure to realize the forming action; To prevent the top block 6 from scratching the packaging material when smoothing the protrusions, arc chamfers are provided on the upper edges of multiple groups of air suction holes 7 and the outer edge of the upper end of the top block 6. The top block 6 is made of polytetrafluoroethylene, which has very good surface smoothness. Combined with the arc chamfer, it ensures that the surface of the packaging material will not be damaged when the top block 6 rotates; To drive the top block 6 to rise and form a pre-pressure, a negative pressure box 11 is slidably connected to the inner lower wall of the machine table 1 through a lifting drive structure. The lifting drive structure includes a cylinder 9 and a push plate 10. The cylinder 9 is fixedly connected to the inner lower wall of the machine table 1, the push plate 10 is fixedly connected to the end of the extending shaft of the cylinder 9, and the upper wall of the push plate 10 is fixedly connected to the lower wall of the negative pressure box 11. The extension and retraction of the extending shaft of the cylinder 9 can drive the top block 6 to rise and fall. When the horizontal height of the top block 6 rises slightly higher than the inner lower wall of the mold cavity 3, a certain pre-pressure can be formed on the packaging material; To generate an adsorption force, a negative pressure pump 8 is connected to the inside of the negative pressure box 11 through an air pipe 12. A rotating seat 13 is provided on the upper wall of the negative pressure box 11. One end of the connecting pipe 14 away from the top block 6 is rotatably connected to the inner side wall of the rotating seat 13. The end of the connecting pipe 14 facing the rotating seat 13 sequentially penetrates the inner wall of the rotating seat 13, the upper wall of the negative pressure box 11 and extends into the inside of the negative pressure box 11. Sealing members 21 for sealing are provided between the top block 6 and the inner side wall of the through hole, and between the connecting pipe 14 and the rotating seat 13. The negative pressure pump 8 is connected to the inside of the mold cavity 3 through the negative pressure box 11, the air vent hole 22 in the connecting pipe 14, and the air suction hole 7 in the top block 6; To form a smoothing action, a rotating drive structure for driving the connecting pipe 14 to rotate is provided on the upper wall of the negative pressure box 11. An electric control exhaust valve 15 for relieving the negative pressure state in the negative pressure box 11 is fixedly connected to the side wall of the negative pressure box 11. The rotating drive structure includes a right-angle reducer 17, a driving motor 16 and a rotating shaft 18. The right-angle reducer 17 is fixedly connected to the upper wall of the negative pressure box 11. The driving motor 16 is fixedly connected to the input end of the right-angle reducer 17 and the output shaft of the driving motor 16 is fixedly connected to the input shaft of the right-angle reducer 17. The rotating shaft 18 is fixedly connected to the end of the output shaft of the right-angle reducer 17 and the axis of the rotating shaft 18 is parallel to the axis of the connecting pipe 14. The rotating shaft 18 and the connecting pipe 14 are meshed and driven by two groups of synchronous pulleys 20 and a group of synchronous belts 19. The driving motor 16 drives the connecting pipe 14 to rotate through the rotating shaft 18, the synchronous pulleys 20 and the synchronous belt 19, and then drives the top block 6 to rotate, forming a continuous smoothing action. After being decelerated by the right-angle reducer 17, the rotation of the top block 6 is slow and stable, effectively avoiding abrasion at the bottom of the packaging material.

[0020] A forming method for a packaging box forming device, the forming method comprising the following steps: S1. Attach the packaging material softened by high temperature to the forming die 2 on the upper side of the machine table 1. Start the negative pressure pump 8. The negative pressure pump 8 extracts the air in the negative pressure box 11 and sucks away the air in the mold cavity 3 through the ventilation holes 22 and multiple suction holes 7, reducing the air pressure between the mold cavity 3 and the packaging material. The packaging material is squeezed tightly inside the mold cavity 3 by the external air pressure until the packaging material is completely sucked and covered on the inner surface of the mold cavity 3, thereby obtaining the shape of the packaging box. S2. When the packaging material is completely attached to the inner surface of the mold cavity 3, in order to prevent the lower surface of the packaging material from being sucked into a convex shape by the negative pressure, the extending shaft of the cylinder 9 extends a certain distance, driving the top block 6 to protrude from the inner lower wall of the mold cavity 3, and start the driving motor 16. When the driving motor 16 rotates, it is decelerated by the right-angle reducer 17 and then drives the rotating shaft 18 to rotate. The rotating shaft 18 drives the connecting pipe 14 to rotate through two sets of synchronous pulleys 20 and a set of synchronous belts 19, and then drives the top block 6 to rotate slowly. While the top block 6 rotates slowly, the contact position between the suction hole 7 and the packaging material is switched, and the part sucked into a convex shape by the suction hole 7 is flattened by the solid position on the upper wall of the top block 6. S3. After the packaging box is formed, turn off the negative pressure pump 8, retract the extending shaft of the cylinder 9, open the electric control exhaust valve 15, and fill the negative pressure box 11 with air through the external air pressure, so that the negative pressure adsorption state between the packaging box and the mold cavity 3 is released, facilitating the removal of the packaging box.

[0021] Working principle: When the negative pressure pump 8 works, it sucks away the air inside the negative pressure box 11 and sucks away the air inside the mold cavity 3 through the ventilation holes 22 and multiple groups of suction holes 7, and then squeezes the packaging material into the mold cavity 3 through the action of the external atmospheric pressure to achieve the forming action. The top block 6 is made of polytetrafluoroethylene, and polytetrafluoroethylene has very good surface smoothness. With the arc chamfer, the top block 6 will not cause damage to the surface of the packaging material when rotating. The extending and retracting of the extending shaft of the cylinder 9 can drive the top block 6 to rise and fall. When the horizontal height of the top block 6 rises slightly higher than the inner lower wall of the mold cavity 3, it can form a certain pre-pressure on the packaging material; the negative pressure pump 8 is connected to the inside of the mold cavity 3 through the ventilation holes 22 in the negative pressure box 11 and the connecting pipe 14 and the suction holes 7 in the top block 6. The driving motor 16 drives the connecting pipe 14 to rotate through the rotating shaft 18, synchronous pulleys 20 and synchronous belts 19, and then drives the top block 6 to rotate, forming a continuous flattening action. After being decelerated by the right-angle reducer 17, the rotation action of the top block 6 is slow and stable, effectively avoiding wear on the bottom of the packaging material.

[0022] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A packaging box forming device, characterized in that: The invention comprises a machine (1), a forming mold (2) and a negative pressure pump (8); the front wall of the machine (1) is rotatably connected to a maintenance door (4); the side wall of the machine (1) is provided with a heat dissipation window (5); the forming mold (2) is arranged on the upper wall of the machine (1); the lower end of the forming mold (2) penetrates through the machine (1) and extends into the interior of the machine (1); the negative pressure pump (8) is fixedly connected to the inner lower wall of the machine (1) and close to the left wall; the upper wall of the forming mold (2) is provided with a mold cavity (3); the inner lower wall of the mold cavity (3) is provided with four groups of through holes; the inner side walls of the four groups of through holes are all slidably connected to a top block (6); the lower end of the top block (6) is fixedly connected to a connecting pipe (14); the inner lower wall of the machine (1) is driven by a lifting device. The dynamic structure is slidably connected to a negative pressure box (11); the negative pressure pump (8) is connected to the inside of the negative pressure box (11) through an air pipe (12); a rotating seat (13) is provided on the upper wall of the negative pressure box (11); the end of the connecting pipe (14) away from the top block (6) is rotatably connected to the inner wall of the rotating seat (13); the end of the connecting pipe (14) facing the rotating seat (13) passes through the inner wall of the rotating seat (13) and the upper wall of the negative pressure box (11) in sequence and extends into the negative pressure box (11); the upper wall of the negative pressure box (11) is provided with a rotating drive structure for driving the connecting pipe (14) to rotate; and the side wall of the negative pressure box (11) is fixedly connected to an electrically controlled exhaust valve (15) for releasing the negative pressure state in the negative pressure box (11).

2. A packaging box forming device according to claim 1, characterized in that: The inner wall of the top block (6) is provided with a plurality of groups of irregularly distributed air suction holes (7), and the plurality of groups of air suction holes (7) are all connected to the upper wall and the lower wall of the top block (6). The inner wall of the connecting pipe (14) is provided with air vents (22) that are connected vertically, and the interior of the negative pressure box (11) is connected to the interior of the mold cavity (3) through the air vents (22) and the plurality of groups of air suction holes (7).

3. A packaging box forming device according to claim 2, characterized in that: The upper edges of the plurality of groups of air suction holes (7) and the outer edges of the upper ends of the top blocks (6) are all provided with circular arc chamfers.

4. A packaging box forming device according to claim 3, characterized in that: The top block (6) is made of polytetrafluoroethylene.

5. A packaging box forming device according to claim 4, characterized in that: The lifting drive structure comprises a cylinder (9) and a push plate (10); the cylinder (9) is fixedly connected to the lower wall of the inner side of the machine platform (1); the push plate (10) is fixedly connected to the end of the extended shaft of the cylinder (9); and the upper wall of the push plate (10) is fixedly connected to the lower wall of the negative pressure box (11).

6. A packaging box forming device according to claim 5, characterized in that: The rotary drive structure comprises a right-angle reducer (17), a drive motor (16) and a rotating shaft (18); the right-angle reducer (17) is fixedly connected to the upper wall of the negative pressure box (11); the drive motor (16) is fixedly connected to the input end of the right-angle reducer (17), and the output shaft of the drive motor (16) is fixedly connected to the input shaft of the right-angle reducer (17); the rotating shaft (18) is fixedly connected to the end of the output shaft of the right-angle reducer (17), and the axis center line of the rotating shaft (18) is parallel to the axis center line of the connecting tube (14).

7. A packaging box forming device according to claim 6, characterized in that: The rotating shaft (18) and the connecting pipe (14) are meshed and driven by two sets of synchronous wheels (20) and a set of synchronous belts (19).

8. A packaging box forming device according to claim 7, characterized in that: Sealing members (21) for sealing are provided between the top block (6) and the inner wall of the through hole, and between the connecting pipe (14) and the rotating seat (13).

9. A molding method of a packaging box molding device, applicable to the packaging box molding device according to claim 8, characterized in that: The molding method comprises the following steps: S1, attaching the packaging material softened by high temperature to the forming mold (2) on the upper side of the machine table (1), starting the negative pressure pump (8), the negative pressure pump (8) extracts the air in the negative pressure box (11), and absorbs the air in the mold cavity (3) through the vent hole (22) and the plurality of suction holes (7), so that the air pressure between the mold cavity (3) and the packaging material is reduced, and the packaging material is squeezed tightly inside the mold cavity (3) by the external air pressure until the packaging material is completely sucked and covers the inner surface of the mold cavity (3), thereby obtaining the shape of the packaging box; S2. When the packaging material completely fits the inner surface of the mold cavity (3), in order to prevent the lower surface of the packaging material from being sucked into a convex shape by negative pressure, the cylinder (9) extends the shaft a certain distance, driving the top block (6) to protrude from the lower wall of the inner side of the mold cavity (3), and starts the drive motor (16). When the drive motor (16) rotates, it is decelerated by the right-angle reducer (17), and then drives the rotating shaft (18) to rotate. The rotating shaft (18) drives the connecting pipe (14) to rotate through two sets of synchronous wheels (20) and a set of synchronous belts (19), thereby driving the top block (6) to rotate slowly. While the top block (6) rotates slowly, the position where the suction hole (7) contacts the packaging material is switched, and the part sucked into a convex shape by the suction hole (7) is flattened through the physical position of the upper wall of the top block (6); S3. After the packaging box is formed, the negative pressure pump (8) is turned off, the cylinder (9) extends and retracts, the electric-controlled exhaust valve (15) is opened, and air is filled into the negative pressure box (11) by external air pressure, so that the negative pressure adsorption state between the packaging box and the mold cavity (3) is released, making it easier to take out the packaging box.

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