Plastic shell injection mold

Abstract

The utility model discloses a plastic shell injection mold which comprises a female mold and is characterized by further comprising a lifting plate, the lifting plate is arranged above the female mold, a male mold is arranged in the center of the bottom of the lifting plate, and a cavity is formed between the male mold and the female mold; the injection molding openings are formed in the two sides of the female mold, the demolding chamber is arranged at the bottom end of the female mold, air guide pipes are evenly arranged in the demolding chamber through a support, and an external pipeline is arranged at one end of the demolding chamber; the gas path channels are uniformly distributed at the top of the gas guide pipe, and the bottom ends of the gas path channels are communicated with the gas guide pipe. By installing the female die, the male die, the cavity, the demolding chamber, the air channel, the air guide pipe, the external pipeline and the pulse valve, non-contact demolding is achieved, the shape and size precision of a plastic part can be better kept, and deformation or surface damage of the plastic part caused by local stress concentration during demolding of a traditional ejector pin is reduced.

Description

Technical Field

[0001] This utility model relates to the field of injection molding technology, specifically to an injection mold for a plastic shell. Background Technology

[0002] A plastic shell injection mold is a tool used to manufacture plastic shells. It uses the injection molding process to inject molten plastic material into the mold cavity, and after cooling and solidification, it forms a plastic shell of the desired shape. It generally includes a cavity mold and a punch mold.

[0003] After the plastic shell has cooled and solidified, the plastic part needs to be removed from the mold. The common method is to use a drive device to drive the ejector pins to apply an upward force to the bottom of the plastic part to achieve demolding. Even if the ejector pins are densely distributed, it is difficult to ensure that the ejection force is completely uniform across the entire surface of the plastic part. Moreover, because the contact area between the ejector pins and the plastic part is small, obvious ejector pin marks are easily formed on the surface of the plastic part during the ejection process, which affects the quality of the plastic shell. Utility Model Content

[0004] The purpose of this invention is to provide a plastic shell injection mold to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a plastic shell injection mold, comprising: a cavity mold, characterized in that it further comprises...

[0006] A lifting plate is provided above the die cavity, and a punch is provided at the center of the bottom of the lifting plate, forming a cavity between the punch and the die cavity;

[0007] Injection ports are located on both sides of the cavity, and one end of the injection port is connected to the inner wall of the cavity.

[0008] A demolding chamber is located at the bottom of the cavity mold, and air guide pipes are evenly arranged inside the demolding chamber through a support. An external pipeline is provided at one end of the demolding chamber.

[0009] The air passages are evenly distributed at the top of the air guide tube, and the bottom ends of the air passages are all connected to the air guide tube. The top ends of the air passages extend to the bottom of the cavity.

[0010] Preferably, O-rings are provided on the outer side of the contact surface between the air passage and the cavity, and the O-rings are all made of rubber.

[0011] Preferably, a first frame is provided on one side of the die, and a lead screw is provided inside the first frame. A drive block is sleeved on the lead screw, and one side of the drive block is connected to the lifting plate.

[0012] Preferably, a drive motor is fixed to the bottom of the first frame, and the output end of the drive motor is connected to a lead screw.

[0013] Preferably, a second frame is provided on the side of the concave mold away from the first frame, and a guide rod is provided inside the second frame. The side of the lifting plate near the guide rod is connected to the guide rod through a guide sleeve.

[0014] Preferably, positioning grooves are provided at the four corners of the top of the die, and positioning posts matching the positioning grooves are provided at the four corners of the bottom of the lifting plate.

[0015] Preferably, each of the positioning grooves has a buffer pad at its bottom, and the buffer pads are all made of rubber.

[0016] Preferably, the end of the air guide tube closest to the external pipeline is connected to the external pipeline via a connecting pipe, and a pulse valve is provided on the external pipeline.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows: The plastic shell injection mold is equipped with a concave mold, a convex mold, a cavity, a demolding chamber, an air passage, an air guide pipe, an external pipe, and a pulse valve. A cavity is formed between the convex mold and the concave mold. After the injected plastic is introduced into the cavity and cooled, it forms the main body of the plastic shell. The external pipe is connected to an air compressor. Compressed gas enters the air guide pipe evenly through the connecting pipe, and then enters the bottom of the cavity through the air passage, so that the main body of the plastic shell and the bottom of the cavity form an air cushion layer. The gas pressure is used to apply pressure evenly to the main body of the plastic shell, pushing it away from the inner surface of the cavity, realizing non-contact demolding. It can better maintain the shape and dimensional accuracy of the plastic part and reduce the deformation or surface damage of the plastic part caused by local stress concentration during traditional ejector demolding. Attached Figure Description

[0018] Figure 1 This is a front view cross-sectional structural diagram of the present invention;

[0019] Figure 2 This is a top view schematic diagram of the air passage structure of this utility model;

[0020] Figure 3 This is a top view schematic diagram of the concave mold structure of this utility model;

[0021] Figure 4 This is a partially enlarged cross-sectional structural diagram of the present invention.

[0022] In the diagram: 1. Cavity; 2. Mold cavity; 3. Lifting plate; 4. Punch; 5. First frame; 6. Second frame; 7. Lead screw; 8. Drive block; 9. Drive motor; 10. Guide rod; 11. Demolding chamber; 12. Air duct; 13. Air passage; 14. O-ring; 15. External pipe; 16. Pulse valve; 17. Injection port; 18. Connecting pipe; 19. Positioning groove; 20. Positioning pin; 21. Buffer pad. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0024] Please see Figure 1-4 One embodiment of this utility model provides: a plastic shell injection mold, comprising: a cavity mold 1, and further comprising...

[0025] Lifting plate 3 is positioned above the cavity mold 1, and a punch 4 is positioned at the center of the bottom of the lifting plate 3, forming a cavity 2 between the punch 4 and the cavity mold 1.

[0026] A first frame 5 is provided on one side of the die 1, and a lead screw 7 is provided inside the first frame 5. A drive block 8 is sleeved on the lead screw 7, and one side of the drive block 8 is connected to the lifting plate 3.

[0027] Preferably, a drive motor 9 is fixed to the bottom of the first frame 5, and the output end of the drive motor 9 is connected to the lead screw 7;

[0028] When the drive motor 9 starts, it drives the lead screw 7 to rotate. The drive block 8 moves downward along the lead screw 7, which drives the lifting plate 3 to descend. The punch 4 and the die 1 close to form a complete cavity 2. Compared with the impact start of the hydraulic mold closing mechanism, it can reduce mold collision and wear and extend mold life.

[0029] A second frame 6 is provided on the side of the cavity mold 1 away from the first frame 5, and a guide rod 10 is provided inside the second frame 6. The side of the lifting plate 3 close to the guide rod 10 is connected to the guide rod 10 through a guide sleeve, so that the lifting plate 3 moves vertically and ensures the mold closing accuracy.

[0030] The four corners of the top of the die 1 are provided with positioning grooves 19, and the four corners of the bottom of the lifting plate 3 are provided with positioning pins 20 that match the positioning grooves 19.

[0031] The bottom of the positioning groove 19 is provided with a buffer pad 21, and the buffer pad 21 is made of rubber. When the mold is closed, the positioning pin 20 is inserted into the positioning groove 19 at the top of the cavity mold 1, and flexible positioning is achieved through the buffer pad 21.

[0032] Injection port 17 is located on both sides of the cavity 1, and one end of injection port 17 is connected to the inner wall of cavity 2. Molten plastic is injected into cavity 2 through injection port 17 to fill cavity 2. The plastic cools and solidifies in cavity to form plastic shell body.

[0033] Demolding chamber 11 is located at the bottom of the cavity mold 1, and air guide pipes 12 are evenly arranged inside the demolding chamber 11 through a support. An external pipeline 15 is provided at one end of the demolding chamber 11.

[0034] Air passage 13 is evenly distributed at the top of air guide tube 12, and the bottom of air passage 13 is connected to air guide tube 12. The top of air passage 13 extends to the bottom of cavity 2.

[0035] The end of the air duct 12 near the external pipeline 15 is connected to the external pipeline 15 through the connecting pipe 18, and a pulse valve 16 is provided on the external pipeline 15.

[0036] When the pulse valve 16 is opened, compressed gas enters the demolding chamber 11 and is evenly distributed to each air guide pipe 12 through the connecting pipe 18. The gas enters the bottom of the cavity 2 through the air passage 13, forming an air cushion layer between the plastic part and the surface of the cavity 2. The gas pressure is evenly applied to the bottom of the plastic part, causing it to detach from the inner surface of the cavity 2.

[0037] Non-contact demolding can better maintain the shape and dimensional accuracy of plastic parts, and reduce the deformation or surface damage of plastic parts caused by local stress concentration during traditional ejector demolding.

[0038] O-rings 14 are provided on the outer side of the contact surface between the air passage 13 and the cavity 2, and the O-rings 14 are all made of rubber.

[0039] O-ring 14 fills the tiny gap between air passage 13 and cavity 2 through elastic deformation, preventing gas from escaping laterally, so that the gas pressure is evenly applied to the bottom of the plastic part, improving the demolding effect;

[0040] The specific models and specifications of the drive motor 9 and the pulse valve 16 need to be determined by selection calculation based on the specifications and parameters of the device. The selection calculation method is existing technology, so it will not be described in detail here.

[0041] Working principle: In this embodiment, the drive motor 9 starts, driving the lead screw 7 to rotate. The drive block 8 moves downward along the lead screw 7, causing the lifting plate 3 to descend. The positioning pin 20 inserts into the positioning groove 19 at the top of the die 1, achieving flexible positioning through the buffer pad 21. The punch 4 closes with the die 1, forming a complete cavity 2. Molten plastic is injected into the cavity 2 through the injection port 17, filling the cavity 2. The plastic cools and solidifies inside the cavity, forming the main body of the plastic shell. Then, the drive motor 9 reverses, and the lead screw 7 drives the lifting plate 3 to rise, separating the punch 4 from the plastic part. The part remains inside the cavity 2 of the mold 1. Since the external pipe 15 is connected to the air compressor, the pulse valve 16 is opened at this time, and the compressed gas enters the demolding chamber 11. It is evenly distributed to each air guide pipe 12 through the connecting pipe 18. The gas enters the bottom of the cavity 2 through the air passage 13, forming an air cushion layer between the plastic part and the surface of the cavity 2. The gas pressure acts evenly on the bottom of the plastic part, causing it to detach from the inner surface of the cavity 2, thereby achieving non-contact demolding. This can better maintain the shape and dimensional accuracy of the plastic part and reduce the deformation or surface damage of the plastic part caused by local stress concentration during traditional ejector demolding.

[0042] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0043] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0044] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0045] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A plastic housing injection mold, comprising: The die (1) is characterized by further comprising: Lifting plate (3), the lifting plate (3) is disposed above the cavity (1), and a punch (4) is disposed at the center of the bottom of the lifting plate (3), and a cavity (2) is formed between the punch (4) and the cavity (1). Injection port (17), the injection port (17) is provided on both sides of the cavity (1), and one end of the injection port (17) is connected to the inner wall of the cavity (2); Demolding chamber (11), the demolding chamber (11) is located at the bottom end of the cavity mold (1), and the interior of the demolding chamber (11) is evenly provided with air guide pipes (12) through a support, and one end of the demolding chamber (11) is provided with an external pipeline (15). Air passage (13) is evenly distributed on the top of air guide tube (12), and the bottom of air passage (13) is connected to air guide tube (12). The top of air passage (13) extends to the bottom of cavity (2).

2. The plastic shell injection mold of claim 1, wherein: O-rings (14) are provided on the outer side of the contact surface between the air passage (13) and the cavity (2), and the O-rings (14) are all made of rubber.

3. The plastic shell injection mold of claim 1, wherein: A first frame (5) is provided on one side of the concave mold (1), and a lead screw (7) is provided inside the first frame (5). A drive block (8) is sleeved on the lead screw (7), and one side of the drive block (8) is connected to the lifting plate (3).

4. The plastic shell injection mold of claim 3, wherein: The bottom of the first frame (5) is fixed with a drive motor (9), and the output end of the drive motor (9) is connected to the lead screw (7).

5. The plastic shell injection mold of claim 3, wherein: The concave mold (1) is provided with a second frame (6) on the side away from the first frame (5), and a guide rod (10) is provided inside the second frame (6). The lifting plate (3) is connected to the guide rod (10) on the side close to the guide rod (10) through a guide sleeve.

6. The plastic shell injection mold of claim 1, wherein: The four corners at the top of the die (1) are provided with positioning grooves (19), and the four corners at the bottom of the lifting plate (3) are provided with positioning posts (20) that match the positioning grooves (19).

7. The plastic shell injection mold of claim 6, wherein: Each of the positioning grooves (19) has a buffer pad (21) at its bottom, and the buffer pads (21) are all made of rubber.

8. The plastic shell injection mold of claim 1, wherein: The end of the air duct (12) near the external pipeline (15) is connected to the external pipeline (15) via a connecting pipe (18), and a pulse valve (16) is provided on the external pipeline (15).

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