Injection molding equipment for plastic packaging box

Abstract

The utility model relates to plastic packing box injection molding equipment which comprises a fixed mold part, a movable mold part and a movable mold auxiliary part, the movable mold auxiliary part and the movable mold part are matched with the fixed mold part to form an injection molding core and an injection molding cavity, the fixed mold part comprises a base body and paired inclined guide columns, and the inclined guide columns are arranged on the base body. A trapezoidal positioning groove is formed in the side, facing the movable mold part, of the base body, a first cavity is formed in the center of the positioning groove, a pouring gate is further formed in the center of the first cavity, and the paired inclined guide columns are formed in the positioning groove and located on the outer side of the first cavity. Through cooperative arrangement of the fixed mold part, the movable mold part and the movable mold auxiliary part, the device can be separated from the outer wall of a molded plastic meal box through opposite movement of the two groups of mold components in the process of injection molding and demolding, and then the movable mold auxiliary part is moved to be separated from the inner wall of the molded plastic meal box; therefore, the deformation and damage of the molded plastic meal box caused by a demolding mode of ejection by using an ejector pin can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of packaging box injection molding technology, specifically to a plastic packaging box injection molding equipment. Background Technology

[0002] When manufacturing plastic packaging boxes, plastic raw material granules need to be heated and melted before being added to a mold. After cooling and solidification, the boxes are demolded.

[0003] Traditional demolding methods mostly rely on ejector pins to push the molded product out of the mold. However, this method has many drawbacks. The ejector pins need to apply a large ejection force during demolding to overcome the adhesion between the molded product and the mold. However, since the bearing area of ​​the ejector pins is often small, this concentrated force can easily lead to uneven stress on the surface of the plastic part, resulting in deformation or damage. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] This invention provides a plastic packaging box injection molding equipment, which solves the problem that the traditional method of using ejector pins to eject molded products may cause product deformation or damage.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a plastic packaging box injection molding equipment, comprising a fixed mold part, a moving mold part, and a moving mold auxiliary part. The moving mold auxiliary part and the moving mold part cooperate with the fixed mold part to form an injection core and an injection cavity. The fixed mold part includes a base and a pair of inclined guide pillars. A trapezoidal positioning groove is formed on the side of the base facing the moving mold part. A first cavity is formed at the center of the positioning groove. A gate is also provided at the center of the first cavity. The pair of inclined guide pillars are formed on the positioning groove and located outside the first cavity. The moving mold part includes a push plate, a pair of support pillars, a support base, and two sets of mold-separating assemblies. The opposing sides of the push plate and the support base are fixedly connected by the pair of support pillars. The two sets of mold-separating assemblies are movably disposed on the side of the support base facing the base, and the position of the two sets of mold-separating assemblies is adjusted by the inclined guide pillars. The moving mold auxiliary part includes a drive seat and an inner core. The inner core is formed at the center of the drive seat on the side facing the moving mold part. The drive seat has a sliding groove that cooperates with the support column, so that the drive seat is sleeved on the pair of support columns and can move along their axial direction. The first cavity and the two sets of mold components together form an injection molding cavity. The inner core can be moved into the injection molding cavity to form an injection molding core.

[0008] Preferably, the mold parting assembly includes at least one guide rod, a number of springs equal to the number of guide rods, and a movable body. The guide rods pass through and are slidably connected to the adjacent bottom or top wall of the support base. The springs are disposed outside the support base and sleeved on the guide rods, with both ends of the springs fixedly connected to the guide rods and the support base, respectively. One end of the guide rod located inside the support base is fixedly connected to the movable body. A second cavity is formed at the center of the movable body, and an inclined cylindrical opening that cooperates with the inclined guide post is formed on the movable body. The second cavities on the two movable bodies are symmetrical to each other and together with the first cavity form an injection molding cavity. A slot is formed in the middle of the support base that penetrates the support base, and the inner core can move through the slot to extend into or out of the injection molding cavity.

[0009] In a further preferred embodiment, the drive seat has two transverse extension plates formed on the side facing away from the fixed mold portion, and each transverse extension plate has a vertical extension plate formed at the end away from the drive seat. The distance between the two vertical extension plates is less than the height of the push plate, and the push plate is located within the space enclosed by the drive seat, the two transverse extension plates, and the two vertical extension plates.

[0010] In a further preferred embodiment, the moving mold auxiliary part further includes a magnetic suction plate, which is fixedly connected to the side of the drive seat facing the support seat, and the magnetic suction plate and the support seat can be magnetically connected.

[0011] In a further preferred embodiment, the top and bottom of the support base are both formed with protrusions, and the top and bottom of the base are both formed with movable limiting baffles. The support base utilizes the cooperation between the protrusions and the movable limiting baffles to define its movement space. The inner side of the movable limiting baffle is also fixedly connected with a straight guide post whose length is adapted to the length of the movable limiting baffle. The straight guide post passes through the support base and is slidably connected to it.

[0012] (III) Beneficial Effects

[0013] Compared with the prior art, this utility model provides a plastic packaging box injection molding equipment, which has the following beneficial effects:

[0014] In this invention, by coordinating the fixed mold part, the moving mold part, and the moving mold auxiliary part, the device can separate from the outer wall of the molded plastic lunch box by moving the two mold components in opposite directions during the demolding process after injection molding, and then move the moving mold auxiliary part to separate from the inner wall of the molded plastic lunch box. This reduces the deformation and damage to the molded plastic lunch box caused by the ejection method using ejector pins. Attached Figure Description

[0015] Figure 1 This is a structural schematic diagram of a plastic packaging box injection molding equipment according to the implementation plan;

[0016] Figure 2 for Figure 1 A schematic diagram of the disassembled structure of a medium-sized plastic packaging box injection molding equipment;

[0017] Figure 3 This is a structural schematic diagram of the moving mold part according to the implementation plan;

[0018] Figure 4 for Figure 3 A schematic diagram of the moving part of the central module from another angle.

[0019] In the diagram: 10. Fixed mold section; 11. Base body; 111. Positioning groove; 112. First cavity; 12. Inclined guide post; 13. Movable limiting baffle; 14. Straight guide post; 20. Moving mold section; 21. Push plate; 22. Support post; 23. Support seat; 231. Slot; 232. Protrusion; 24. Guide rod; 25. Spring; 26. Movable body; 261. Second cavity; 30. Moving mold auxiliary section; 31. Drive seat; 311. Horizontal extension plate; 312. Vertical extension plate; 313. Sliding groove; 32. Inner core; 33. Magnetic suction plate. Detailed Implementation

[0020] 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.

[0021] Please see Figure 1 and Figure 2 A plastic packaging box injection molding equipment includes a fixed mold section 10, a moving mold section 20, and a moving mold auxiliary section 30. The moving mold auxiliary section 30 and the moving mold section 20 cooperate with the fixed mold section 10 to form an injection core and an injection cavity, so that the three can cooperate to be used for injection molding of plastic packaging boxes.

[0022] See Figure 2The fixed mold section 10 includes a base 11 and a pair of inclined guide pillars 12. A trapezoidal positioning groove 111 is formed on the side of the base 11 facing the moving mold section 20, allowing it to accommodate two sets of mold components in the moving mold section 20. A first cavity 112 is formed at the center of the positioning groove 111, and the first cavity 112 and the two sets of mold components in the moving mold section 20 together constitute an injection cavity. A gate is also provided at the center of the first cavity 112, allowing the injection molding machine to inject molten plastic into it. The pair of inclined guide pillars 12 are formed on the positioning groove 111 and located outside the first cavity 112, and the pair of inclined guide pillars 12 are used to guide the movement of the two sets of mold components in the moving mold section 20. Movable limiting baffles 13 are formed at the top and bottom of the base 11. A straight guide post 14 with a length adapted to the length of the movable limiting baffle 13 is fixedly connected to the inner side of the movable limiting baffle 13. The movable limiting baffle 13 and the straight guide post 14 are used to guide the movement of the moving mold part 20 as a whole and limit the movement space.

[0023] See Figure 3 and Figure 4 The moving mold section 20 includes a push plate 21, a pair of support columns 22, a support base 23, and two sets of mold assembly components. The opposing sides of the push plate 21 and the support base 23 are fixedly connected by the pair of support columns 22. The two sets of mold assembly components are movably disposed on the side of the support base 23 facing the base 11, and their position is adjusted by the inclined guide column 12. The top and bottom of the support base 23 are both formed with protrusions 232, and the straight guide column 14 passes through the support base 23 and is slidably connected to it, so that the support base 23 can move axially along the straight guide column 14, and can only move within the length range limited by the movable limiting baffle 13 to the protrusions 232.

[0024] The two mold-separation components are symmetrical to each other, and each mold-separation component includes at least one guide rod 24, springs 25 in equal numbers to the guide rods 24, and a movable body 26. The guide rods 24 pass through and are slidably connected to the adjacent bottom or top wall of the support base 23. The springs 25 are disposed outside the support base 23 and sleeved on the guide rods 24, with both ends of the springs 25 fixedly connected to the guide rods 24 and the support base 23, respectively. One end of the guide rod 24 located inside the support base 23 is fixedly connected to the movable body 26. An inclined cylindrical opening is formed on the movable body 26 to mate with the inclined guide post 12, allowing the movable body 26 to be inserted into or removed from the inclined guide post 12 through its inclined cylindrical opening. A second cavity 261 is formed at the center of the movable body 26, and the second cavities 261 on the two movable bodies 26 are symmetrical to each other and together with the first cavity 112 form an injection molding cavity. A slot 231 is formed in the middle of the support 23, which penetrates the support 23. The inner core 32 in the moving mold auxiliary part 30 can move through the slot 231 and extend into or out of the injection cavity.

[0025] See Figure 2 The moving mold auxiliary part 30 may include a drive base 31, an inner core 32, and a magnetic chuck 33. The inner core 32 is formed at the center of the drive base 31 facing the moving mold part 20 and constitutes the injection core of the device. A sliding groove 313 is formed on the drive base 31 to cooperate with the support column 22, so that the drive base 31 is sleeved on the pair of support columns 22 and can move along their axial direction. Two transverse extension plates 311 are formed on the side of the drive base 31 facing away from the fixed mold part 10. A vertical extension plate 312 is formed at the end of each transverse extension plate 311 away from the drive base 31. The distance between the two vertical extension plates 312 is less than the height of the push plate 21, so that the push plate 21 is located in the space enclosed by the drive base 31, the two transverse extension plates 311, and the two vertical extension plates 312. The magnetic chuck 33 is fixedly connected to the side of the drive base 31 facing the support base 23, and the magnetic chuck 33 and the support base 23 can be connected by magnetic attraction.

[0026] During injection molding, the moving mold auxiliary part 30 can be moved towards the fixed mold part 10 using a drive device. During this process, the vertical extension plate 312 moves to contact the push plate 21, which in turn drives the moving mold part 20 to move towards the fixed mold part 10. The two mold components in the moving mold part 20 move towards each other under the guidance of the inclined guide post 12 until they cooperate with the first cavity 112 to form a complete injection cavity. At this time, the inner core 32 can extend into the injection cavity to form the injection core. Then, molten plastic can be injected into the gap between the injection cavity and the injection core through the injection mechanism of the injection molding machine.

[0027] After injection molding and cooling, the moving mold auxiliary part 30 can be moved away from the fixed mold part 10 using a drive device. During this process, the magnetic connection between the magnetic plate 33 and the support base 23 allows the moving mold auxiliary part 30 to move along with the moving mold part 20 away from the fixed mold part 10. Until the movable limit baffle 13 contacts the protrusion 232, the support base 23 is stopped and cannot move further, and the two mold assembly parts move away from each other until they separate from the molded plastic lunch box. At this point, the drive device continues to move the moving mold auxiliary part 30 away from the fixed mold part 10, allowing the inner core 32 to separate from the molded plastic lunch box.

[0028] Of all the solutions mentioned above, those involving the connection between two components can be selected according to the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other known connection methods, which will not be elaborated here. For all the fixed connections mentioned above, welding is preferred. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this utility model. The scope of this utility model is defined by the appended claims and their equivalents.

Claims

1. A plastic packaging box injection molding equipment, comprising a fixed mold section (10) and a moving mold section (20), characterized in that, It also includes a moving mold auxiliary part (30), which, together with the moving mold part (20), forms an injection core and an injection cavity in cooperation with the fixed mold part (10). The fixed mold part (10) includes a base (11) and a pair of inclined guide pillars (12). A trapezoidal positioning groove (111) is formed on the side of the base (11) facing the moving mold part (20). A first cavity (112) is formed at the center of the positioning groove (111). A gate is also provided at the center of the first cavity (112). The pair of inclined guide pillars (12) are formed on the positioning groove (111) and are located outside the first cavity (112). The moving mold part (20) includes a push plate (21), a pair of support columns (22), a support base (23), and two sets of mold-separating assemblies. The opposing sides of the push plate (21) and the support base (23) are fixedly connected by the pair of support columns (22). The two sets of mold-separating assemblies are movably arranged on the side of the support base (23) facing the base (11), and the two sets of mold-separating assemblies are adjusted in position by inclined guide columns (12). The moving mold auxiliary part (30) includes a drive seat (31) and an inner core (32). The inner core (32) is formed at the center of the drive seat (31) on the side facing the moving mold part (20). The drive seat (31) has a sliding groove (313) that cooperates with the support column (22), so that the drive seat (31) is sleeved on the pair of support columns (22) and can move along its axial direction. The first cavity (112) and the two sets of mold components together constitute an injection cavity. The inner core (32) can be moved into the injection cavity to form an injection core.

2. The plastic packaging box injection molding equipment according to claim 1, characterized in that: The mold parting assembly includes at least one guide rod (24), a number of springs (25) equal to the number of guide rods (24), and a movable body (26). The guide rods (24) pass through the adjacent bottom or top wall of the support base (23) and are slidably connected thereto. The springs (25) are disposed outside the support base (23) and sleeved on the guide rods (24). The two ends of the springs (25) are fixedly connected to the guide rods (24) and the support base (23) respectively. One end of the guide rods (24) located inside the support base (23) is fixedly connected to the movable body (26). A second cavity (261) is formed at the center of the movable body (26), and an inclined cylindrical opening that cooperates with the inclined guide post (12) is formed on the movable body (26).

3. The plastic packaging box injection molding equipment according to claim 2, characterized in that: The second cavities (261) on the two movable bodies (26) are symmetrical to each other and together with the first cavity (112) form an injection molding cavity. A slot (231) is formed in the middle of the support seat (23) through the support seat (23). The inner core (32) can move through the slot (231) to extend into or out of the injection molding cavity.

4. A plastic packaging box injection molding equipment according to claim 2 or 3, characterized in that: The drive seat (31) has two horizontal extension plates (311) on the side facing away from the fixed mold part (10). Each horizontal extension plate (311) has a vertical extension plate (312) at the end away from the drive seat (31). The distance between the two vertical extension plates (312) is less than the height of the push plate (21). The push plate (21) is located in the space enclosed by the drive seat (31), the two horizontal extension plates (311), and the two vertical extension plates (312).

5. The plastic packaging box injection molding equipment according to claim 4, characterized in that: The moving mold auxiliary part (30) also includes a magnetic plate (33), which is fixedly connected to the side of the drive seat (31) facing the support seat (23), and the magnetic plate (33) and the support seat (23) can be magnetically connected.

6. The plastic packaging box injection molding equipment according to claim 5, characterized in that: The support base (23) has protrusions (232) at the top and bottom, and the base (11) has movable limiting baffles (13) at the top and bottom. The support base (23) utilizes the cooperation between the protrusions (232) and the movable limiting baffles (13) to create its movement space.

7. The plastic packaging box injection molding equipment according to claim 6, characterized in that: The inner side of the movable limiting baffle (13) is also fixedly connected to a straight guide post (14) whose length is adapted to the length of the movable limiting baffle (13). The straight guide post (14) passes through the support base (23) and is slidably connected to it.

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