Injection mold for processing plastic packaging box

Abstract

The utility model discloses a kind of injection mould for plastic packaging box processing, belong to packaging box production technical field, including lower module, upper module is equipped in lower module upper, lower module inside is equipped with forming cavity, the both sides in the inside of upper module are equipped with a row of nozzle, and the nozzle between two sides is connected through hollow tube, the both ends of the bottom of upper module are equipped with first piston rod, and the top of two first piston rods is equipped with the connecting pipe that two nozzles are communicated respectively, two first piston rods are respectively slidably connected in the both ends of lower module inside, the both ends of lower module inner bottom are equipped with second piston rod, and two second piston rods are respectively slidably connected in two first piston rods inside, by upper module close to lower module, air in the inside of first piston rod is extruded to nozzle, reach the effect that the inside of forming cavity is cleaned, ensure that before melt injection, the cleaning of forming cavity is completed, avoid impurity after cleaning again fall into the inside of forming cavity before die gap.

Description

Technical Field

[0001] This utility model relates to the field of packaging box production technology, specifically to an injection mold for processing plastic packaging boxes. Background Technology

[0002] Plastic packaging boxes are packaging containers made primarily of plastic. Injection molds for plastic packaging box processing are specialized tools used to manufacture plastic packaging boxes through injection molding. During the production of plastic packaging boxes, because the main body of the box is a thin-walled structure, the material cavity channels are narrow during injection molding. Single-channel injection can easily lead to uneven material distribution. Furthermore, the thin-walled structure is prone to damage under the force of the ejector device during demolding after product molding. A plastic packaging box injection mold with announcement number CN220447049U injects material into the molding cavity through multiple channels, ensuring that the material fills the molding cavity and increasing the injection rate. Additionally, the ejector device in the mold closing unit is equipped with a wide-faced push plate, which reduces pressure during material ejection through a larger contact area, preventing product damage. A pressure plate is installed on the mold closing unit to hold the product in place during mold separation. The product is then pushed aside by the push plate to complete demolding.

[0003] While the aforementioned technology can push the product to open the pressure plate and complete demolding, it has the problem of not being able to clean the inside of the molding cavity during the mold closing process. Residual plastic debris, dust, mold release agent residue, or residual material from the previous production can embed into the product surface during injection molding, forming defects such as black spots, scratches, and pits. Especially for transparent packaging boxes, impurities will directly lead to a decrease in light transmittance and a significant increase in the rate of appearance defects. Utility Model Content

[0004] The purpose of this utility model is to provide an injection mold for processing plastic packaging boxes, so as to solve the problem mentioned in the background art that the injection molds on the market cannot clean the inside of the molding cavity during the mold closing process.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an injection mold for processing plastic packaging boxes, comprising a lower module, an upper module above the lower module, a molding cavity inside the lower module, a row of nozzles on both sides inside the upper module, the nozzles on both sides being connected by a hollow tube, a first piston rod at both ends of the bottom of the upper module, and a connecting pipe communicating with the two nozzles at the top of each of the two first piston rods, the two first piston rods being slidably connected to both ends inside the lower module, a second piston rod at both ends of the bottom of the lower module, the two second piston rods being slidably connected to the inside of the two first piston rods, a row of storage grooves on both sides inside the lower module, dust suction components for absorbing dust inside the molding cavity on both sides of the lower module, and a moving component for moving the upper module at the top.

[0006] Preferably, the dust collection assembly includes two support frames respectively disposed on both sides of the lower module, and a dust collection fan is installed inside each of the two support frames. A dust filter bag is provided at the output end of each of the two dust collection fans, a flexible hose is provided at the input end of each of the two dust collection fans, and a dust collection cover is provided at the other end of each of the two flexible hoses.

[0007] Preferably, each of the two support frames has a first support plate at both ends, and a rotating column is rotatably connected to the upper part of each of the two first support plates on both sides. The four rotating columns are respectively connected to two hoses. Each of the two first support plates on both sides has a second support plate at both ends. A first rack is slidably connected to the first support plate between the second support plates. The two first racks are respectively meshed with a first rotating gear located at one end of each of the two rotating columns.

[0008] Preferably, each of the two second support plates located above is provided with a connector at its top, and each of the two connectors is provided with a fixing plate at both ends of its bottom. A rotating shaft is rotatably connected between the fixing plates, and a second rotating gear is provided at one end of each of the two rotating shafts. The two ends of the upper module are respectively connected with a second rack that meshes with the two second rotating gears.

[0009] Preferably, each of the two second support plates located at the top is rotatably connected to a movable column, and one end of each of the two movable columns and the two rotating shafts is provided with bevel gears that mesh with each other. A reciprocating screw threaded into the first rack is also rotatably connected between the two second support plates on both sides, and the two reciprocating screws are respectively connected to the two movable columns.

[0010] Preferably, the moving component includes a bending plate disposed on one side of the lower module, and both ends of the top of the bending plate are provided with hydraulic rods, and the output ends of the two hydraulic rods are connected to the top of the upper module. The top of the upper module is also provided with an injection molding tube.

[0011] Preferably, the two first piston rods are arranged diagonally, the two rows of receiving slots correspond to the two rows of nozzles, and the volume of the receiving slots is larger than the volume of the nozzles.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] By bringing the upper module closer to the lower module, the first piston rod slides on the outer surface of the second piston rod, thereby squeezing the air inside the first piston rod into the nozzle. This achieves the effect of cleaning the inside of the molding cavity, ensuring that the molding cavity is cleaned before the melt is injected, and preventing impurities from falling back into the molding cavity during the gap between cleaning and mold closing.

[0014] The dust collection component effectively absorbs the dust blown out of the molding cavity. If the dust raised during air jet cleaning is not removed in time, it may fall back into the molding cavity at the moment of mold closing, causing impurities to re-adhere to the product surface. The timely removal of dust by the dust collection component can cut off the pollution cycle and reduce the product appearance defect rate.

[0015] The second racks on both sides of the upper module enable the vacuuming component to swing. This swinging motion reduces incomplete vacuuming caused by airflow dead zones, thereby improving cleaning efficiency and reducing the likelihood of larger particles clogging the system. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0017] Figure 2 This is a side view of the structure of this utility model;

[0018] Figure 3 This is a cross-sectional structural diagram of the present invention;

[0019] Figure 4 This is a schematic diagram of the bonding structure of the upper and lower modules of this utility model;

[0020] Figure 5 This utility model Figure 1 Enlarged structural diagram at point A;

[0021] Figure 6 This utility model Figure 3 Enlarged structural diagram at point B;

[0022] Figure 7 This is a schematic diagram of the connection structure between the first support plate and the first rack of this utility model.

[0023] In the diagram: 1. Lower module; 2. Upper module; 3. Molding cavity; 4. Nozzle; 5. Hollow tube; 6. First piston rod; 7. Second piston rod; 8. Storage slot; 9. Dust extraction fan; 10. Dust filter bag; 11. Hose; 12. Dust extraction hood; 13. First support plate; 14. Rotating column; 15. First rotating gear; 16. First rack; 17. Second support plate; 18. Rotating shaft; 19. Second rotating gear; 20. Second rack; 21. Injection molding tube. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] This utility model provides the following technical solution: an injection mold for processing plastic packaging boxes:

[0026] Example 1: To solve the problem that existing injection molds cannot clean the inside of the molding cavity 3 during the mold closing process, the following is disclosed: a lower module 1, an upper module 2 above the lower module 1, a molding cavity 3 inside the lower module 1, and a row of nozzles 4 on both sides inside the upper module 2 (e.g., Figure 2 , Figure 3 and Figure 6 As shown), the nozzles 4 on both sides are connected by a hollow tube 5. Both ends of the bottom of the upper module 2 are provided with a first piston rod 6, and the top of each of the two first piston rods 6 is provided with a connecting pipe communicating with the two nozzles 4, used to guide air into the nozzles 4. The two first piston rods 6 are slidably connected to both ends inside the lower module 1. Both ends of the bottom of the lower module 1 are provided with a second piston rod 7 (as shown). Figure 3 As shown), and the two second piston rods 7 are slidably connected inside the two first piston rods 6 respectively. A row of storage slots 8 is opened on both sides inside the lower module 1 for storing the nozzle 4. The top of the upper module 2 is provided with a moving assembly that drives the upper module 2 to move. The moving assembly includes a bending plate located on one side of the lower part of the lower module 1, and hydraulic rods are provided at both ends of the top of the bending plate. The output ends of the two hydraulic rods are connected to the top of the upper module 2. The top of the upper module 2 is also provided with an injection molding tube 21 (as shown). Figures 1-4 As shown), the two first piston rods 6 are arranged diagonally, the two rows of storage slots 8 and the two rows of nozzles 4 correspond to each other, and the volume of the storage slots 8 is larger than the volume of the nozzles 4.

[0027] By activating the hydraulic rod, the upper module 2 is brought closer to the lower module 1, and the first piston rod 6 descends synchronously with the upper module 2, thereby sliding on the outer surface of the second piston rod 7. The second piston rod 7 then compresses the air inside the first piston rod 6, and the compressed air then enters the nozzle 4 through the connecting pipe (e.g., Figure 3 and Figure 6 As shown), air then enters the connected nozzle 4 through the hollow tube 5, and then exits through the opening of the nozzle 4, thereby spraying airflow into the molding cavity 3 to remove residual dust, debris, or mold release agent residue. When the upper module 2 and the lower module 1 are closed, the nozzle 4 will enter the receiving groove 8 accordingly, and then inject molten plastic (such as...) into the molding cavity 3 through the injection tube 21. Figures 1-4 As shown in the figure, after cooling and solidification, it forms a packaging box.

[0028] Example 2: Unlike Example 1, the dust-collecting components can absorb dust. The following is disclosed: Dust-collecting components are provided on both sides of the lower module 1 to absorb dust inside the molding cavity 3. Each dust-collecting component includes two support frames respectively disposed on both sides of the lower module 1, and each support frame is equipped with a dust-collecting fan 9 (e.g., ...). Figures 1-4 As shown), both vacuum cleaner fans 9 have dust bags 10 at their output ends for filtering dust, and both vacuum cleaner fans 9 have hoses 11 at their input ends. The other ends of both hoses 11 are equipped with dust hoods 12. Both ends of the two support frames have first support plates 13, and the upper parts of the two first support plates 13 on both sides are rotatably connected to rotating columns 14 (as shown). Figure 5 and Figure 7 As shown), the four rotating columns 14 are respectively connected to two hoses 11. Each end of a first support plate 13 on both sides is provided with a second support plate 17. A first rack 16 is slidably connected to the first support plate 13 between the second support plates 17. The two first racks 16 are respectively meshed with first rotating gears 15 located at one end of each of the two rotating columns 14. The tops of the two upper second support plates 17 are each provided with a connector, and both ends of the bottom of the two connectors are provided with fixing plates. A rotating shaft 18 (as shown) is rotatably connected between the fixing plates. Figure 5 and Figure 7 As shown), one end of each of the two rotating shafts 18 is provided with a second rotating gear 19, and the two ends of the upper module 2 are respectively connected to second racks 20 that mesh with the two second rotating gears 19. The two upper second support plates 17 are each rotatably connected to movable columns, and one end of each of the two movable columns and the two rotating shafts 18 is provided with meshing bevel gears (such as...). Figure 5 and Figure 7 As shown), a reciprocating screw threaded inside the first rack 16 is rotatably connected between the two second support plates 17 on both sides, and the two reciprocating screws are respectively connected to two movable columns.

[0029] When the nozzle 4 sprays air into the molding cavity 3, the vacuum fan 9 can be activated (e.g., Figures 1-4 As shown), the dust sprayed out of the molding cavity 3 is absorbed by the dust suction hood 12. When the upper module 2 approaches the lower module 1, it also drives the second rack 20 to move, thereby driving the second rotating gear 19 to rotate, and further driving the rotating shaft 18 to rotate (as shown). Figure 5 and Figure 7 As shown), then under the action of the bevel gear, it drives the movable column and the reciprocating screw to rotate, thereby driving the first rack 16 to reciprocate on the first support plate 13. Subsequently, under the action of the first rotating gear 15, it drives the rotating column 14 to reciprocate (as shown). Figure 5 and Figure 7 As shown in the figure, the hose 11 then drives the dust cover 12 to swing back and forth, thereby increasing the dust collection effect.

[0030] The above is the entire working process of the device, and all contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0031] The contents not described in detail in this specification are existing technologies known to those skilled in the art. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An injection mold for processing plastic packaging boxes, comprising a lower module (1), an upper module (2) above the lower module (1), and a molding cavity (3) inside the lower module (1); Its features are: The upper module (2) has a row of nozzles (4) on both sides inside. The nozzles (4) on both sides are connected by a hollow tube (5). The bottom of the upper module (2) has a first piston rod (6) at both ends. The top of the two first piston rods (6) is provided with a connecting tube that communicates with the two nozzles (4). The two first piston rods (6) are slidably connected to the two ends inside the lower module (1). The bottom of the lower module (1) has a second piston rod (7) at both ends. The two second piston rods (7) are slidably connected to the two first piston rods (6). The lower module (1) has a row of storage slots (8) on both sides inside. The lower module (1) has dust suction components on both sides to absorb dust inside the molding cavity (3). The upper module (2) has a moving component on the top to drive the upper module (2) to move.

2. The injection mold for processing plastic packaging boxes according to claim 1, characterized in that: The dust collection assembly includes two support frames respectively set on both sides of the lower module (1), and a dust collection fan (9) is installed inside the two support frames. The output end of the two dust collection fans (9) is provided with a dust filter bag (10), the input end of the two dust collection fans (9) is provided with a hose (11), and the other end of the two hoses (11) is provided with a dust collection cover (12).

3. The injection mold for processing plastic packaging boxes according to claim 2, characterized in that: Both ends of the two support frames are provided with first support plates (13), and the upper part of the two first support plates (13) on both sides is rotatably connected with rotating columns (14), and the four rotating columns (14) are respectively connected to two hoses (11). Both ends of one of the first support plates (13) on both sides are provided with second support plates (17), and a first rack (16) is slidably connected to the first support plate (13) between the second support plates (17). The two first racks (16) are respectively meshed with a first rotating gear (15) provided at one end of the two rotating columns (14).

4. The injection mold for processing plastic packaging boxes according to claim 3, characterized in that: The top of the two second support plates (17) located above are provided with connectors, and the bottom ends of the two connectors are provided with fixing plates. A rotating shaft (18) is rotatably connected between the fixing plates. A second rotating gear (19) is provided at one end of each of the two rotating shafts (18). The two ends of the upper module (2) are respectively connected with a second rack (20) that meshes with the two second rotating gears (19).

5. The injection mold for processing plastic packaging boxes according to claim 4, characterized in that: The two second support plates (17) located above each have movable columns rotatably connected inside, and one end of each of the two movable columns and the two rotating shafts (18) is provided with bevel gears that mesh with each other. The two second support plates (17) on both sides are also rotatably connected with reciprocating screws threaded inside the first rack (16), and the two reciprocating screws are respectively connected to the two movable columns.

6. The injection mold for processing plastic packaging boxes according to claim 1, characterized in that: The moving component includes a bending plate disposed on one side of the lower module (1), and both ends of the top of the bending plate are provided with hydraulic rods, and the output ends of the two hydraulic rods are connected to the top of the upper module (2). The top of the upper module (2) is also provided with an injection tube (21).

7. The injection mold for processing plastic packaging boxes according to claim 1, characterized in that: The two first piston rods (6) are arranged diagonally, the two rows of storage slots (8) and the two rows of nozzles (4) correspond to each other, and the volume of the storage slots (8) is greater than the volume of the nozzles (4).

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