Injection molding device for automobile parts

Abstract

The invention belongs to the technical field of injection molding, and particularly relates to an injection molding device for automobile parts, which comprises a workbench, an injection molding assembly, a molding assembly and an air exhaust assembly, the injection molding assembly and the forming assembly are arranged on the two sides of the top of the workbench correspondingly. The injection molding assembly comprises an injection molding device, and an injection molding pipe is fixed to the output end of the injection molding device. The forming assembly comprises a forming mold, an injection molding hole matched with the injection molding pipe is formed in the side wall of the forming mold, and the injection molding hole communicates with a cavity in the forming mold; the air exhaust assembly is arranged on the side edge of the forming die and used for exhausting air in the cavity; by arranging the air exhaust assembly, air in the cavity can be rapidly exhausted in the injection molding process, air bubbles or shrinkage cavities formed by air residues are avoided, and therefore the forming quality of automobile parts is improved.

Description

Technical Field

[0001] This invention belongs to the field of injection molding technology, specifically an injection molding device for automotive parts. Background Technology

[0002] Injection molding, also known as injection molding, is a molding process that integrates injection and molding. With its advantages of high molding efficiency, strong adaptability, and controllable product precision, it is widely used in mass production and the processing of complex-shaped parts. In the automotive manufacturing process, a large number of interior, exterior, and functional plastic parts, such as dashboards, lamp covers, clips, and housings, need to be processed through injection molding. Injection molding equipment is the core equipment in the production of automotive plastic parts; its operational stability and molding quality directly determine the quality of the finished automotive plastic parts.

[0003] In existing related technologies, patent CN211165159U discloses an injection molding device for the production of automotive plastic parts. This device mainly includes a main body, a first motor, a first rotating shaft, a push roller, a material cylinder, a mold body, a first mold, and a support arm. The first motor is mounted on one side of the top of the main body, and the material cylinder is fixed to the corresponding side of the top of the main body. The output end of the first motor is connected to the first rotating shaft via a coupling. The push roller is connected to the first rotating shaft and extends into the material cylinder. The mold body is fixed to the outer wall of one side of the main body, the first mold is installed on the inner wall of the mold body, and the support arm is fixed inside the mold body. This existing device aims to reduce manual labor intensity, improve product molding quality and production efficiency, and has certain applicability in conventional injection molding production.

[0004] However, the above-mentioned technologies often have the following drawbacks: after the injection mold is closed and connected, the air in the mold cavity cannot be discharged in a timely and smooth manner, which can easily lead to a series of molding quality problems. On the one hand, untimely venting of the cavity will cause the plastic melt to be obstructed, resulting in insufficient injection volume and the cavity not being completely filled, directly causing defective products such as missing parts and incomplete contours; on the other hand, poor venting will cause the residual gas in the cavity to form high pressure. The high-pressure gas is continuously compressed during the melt injection process and then seeps into the interior of the plastic melt, ultimately causing quality defects such as voids, air holes, loose structure, and silver streaks in the molded automotive plastic parts, which seriously affect the structural strength, appearance integrity, and performance of the parts, making it difficult to meet the high precision and high stability requirements of automotive parts.

[0005] Therefore, the present invention provides an injection molding apparatus for automotive parts. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by the present invention to solve its technical problem is: the injection molding device for automotive parts of the present invention includes a worktable, an injection assembly, a molding assembly and an air extraction assembly; the injection assembly and the molding assembly are respectively disposed on the top two sides of the worktable; The injection molding assembly includes an injection molding device, and an injection molding tube is fixed to the output end of the injection molding device. The molding component includes a molding die, and the side wall of the molding die is provided with an injection hole adapted to the injection tube, and the injection hole communicates with the cavity inside the molding die. The workbench is equipped with a moving component, and the injection molding component is mounted on the moving component. The moving component drives the injection molding component to reciprocate horizontally, thereby controlling the connection or disconnection of the injection tube and the injection hole. The air extraction component is located on the side of the molding die and is used to extract air from inside the cavity.

[0008] Preferably, the assembly further includes a mounting component for mounting and supporting the injection molding assembly. The mounting component includes a base fixed to the top of the worktable, and a double-disc coaxial frame rotatably mounted above the base. The double-disc coaxial frame is formed by a pair of turntables and a central shaft. A motor for driving the rotation of the double-disc coaxial frame is fixed on the base. Hydraulic telescopic rods are fixed to the opposite sidewalls of the two turntables on both sides of the double-disc coaxial frame, and the two halves of the molding die are driven to close or separate by the hydraulic telescopic rods on both sides. Multiple injection molding assemblies are provided and are evenly mounted in the middle of the double-disc coaxial frame by hydraulic telescopic rods.

[0009] Preferably, the vacuum assembly includes an annular groove fixed to the outer wall of the turntable of the double-disc coaxial frame, a rotating cover is rotatably and sealingly installed on the side wall of the annular groove, a connecting pipe is fixed on the rotating cover, the connecting pipe is connected to an external negative pressure device, a flexible hose is fixed on the side wall of the turntable of the double-disc coaxial frame, one end of the flexible hose is connected to the annular groove, and the other end of the flexible hose is connected to the cavity of the molding mold.

[0010] Preferably, the moving component includes an electric guide rail fixedly mounted on the worktable, and the injection molding component is fixedly mounted above the electric guide rail, and the injection molding component is driven by the electric guide rail to dock or separate from the injection mold.

[0011] Preferably, a movable cavity is provided in the inner wall of the mold and the hose connection position. One end of the movable cavity is connected to the hose, and the other end of the movable cavity is provided with an air hole connected to the cavity. A sealing head is provided at the air hole. The sealing head is slidably inserted into the air hole. A limit plate is fixed to the end of the sealing head facing the movable cavity. A retaining ring is fixed inside the movable cavity. A spring is fixed between the retaining ring and the limit plate. The end of the sealing head away from the movable cavity is adapted to the inner wall contour of the cavity.

[0012] Preferably, the injection hole is formed by combining corresponding grooves on two half molds, and movable plates are slidably arranged on the inner walls of the two side grooves respectively. The movable plates are slidably arranged in movable slots opened inside the half molds, and springs are arranged in the movable slots to reset the movable plates.

[0013] Preferably, a triangular plate is vertically fixed at the middle position of each of the two movable plates.

[0014] Preferably, the injection-molded tube is fitted with a heating sleeve.

[0015] Preferably, the heating sleeve is slidably mounted on the injection-molded tube, and a spring is installed on the side wall of the heating sleeve to reset it.

[0016] The beneficial effects of this invention are as follows: 1. The injection molding apparatus for automotive parts described in this invention, by incorporating an air extraction component, can remove air from the cavity before injection molding, preventing air bubbles from remaining in the molded automotive parts and effectively improving product molding quality. Simultaneously, the moving component can drive the injection molding component to precisely align with the injection hole, ensuring the stability of the injection process. Furthermore, the dual-disc coaxial frame in the mounting component, in conjunction with the motor and hydraulic telescopic rod, not only enables rapid opening and closing of the molding die but also allows for multi-station alternating operation through the setup of multiple injection molding components, significantly improving production efficiency.

[0017] 2. The injection molding device for automotive parts described in this invention features a movable plate and a triangular plate at the injection hole, which automatically guide and seal the injection tube during insertion to prevent leakage of the injection liquid. The heating jacket keeps the material inside the injection tube warm, preventing the material from solidifying and blocking the pipe due to temperature drop, thus further ensuring the smooth progress of the injection molding process. Attached Figure Description

[0018] The invention will now be further described with reference to the accompanying drawings.

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a partial structural cross-sectional view of the present invention; Figure 3This is a schematic diagram of the structure of the present invention from another angle; Figure 4 yes Figure 2 Enlarged view of point A in the middle; Figure 5 yes Figure 2 Enlarged view at point B in the middle; Figure 6 yes Figure 3 Enlarged view of point C in the middle.

[0020] In the diagram: 1. Workbench; 2. Electric guide rail; 3. Injection molding device; 4. Base; 5. Double-disc coaxial frame; 6. Annular groove; 7. Rotating cover; 8. Connecting pipe; 9. Molding mold; 10. Hydraulic telescopic rod; 11. Cavity; 12. Hoses; 13. Motor; 14. Injection hole; 15. Movable groove; 16. Spring 1; 17. Movable plate; 18. Triangular plate; 19. Sealing head; 20. Air hole; 21. Spring 2; 22. Movable cavity; 23. Injection pipe; 24. Spring 3; 25. Heating jacket; 26. Retaining ring; 27. Limiting plate. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0022] Example 1: As Figures 1 to 6 As shown in the figure, an injection molding apparatus for automotive parts according to an embodiment of the present invention includes a worktable 1, an injection molding assembly, a molding assembly, and an air extraction assembly; the injection molding assembly and the molding assembly are respectively disposed on the top two sides of the worktable 1. The injection molding assembly includes an injection molding device 3, and an injection molding tube 23 is fixed on the output end of the injection molding device 3. The molding assembly includes a molding die 9, and the side wall of the molding die 9 is provided with an injection hole 14 adapted to the injection tube 23. The injection hole 14 is connected to the cavity 11 inside the molding die 9.

[0023] During operation, the external negative pressure device delivers negative pressure to the rotating cover 7 through the connecting pipe 8. Since the rotating cover 7 is sealed and rotatably connected to the annular groove 6, the annular groove 6 rotates synchronously with the turntable during the rotation of the double-disc coaxial frame 5, while the rotating cover 7 remains fixed. This ensures that the negative pressure can be stably transmitted to the cavity 11 of the molding mold 9 through the annular groove 6 and the hose 12. Multiple injection molds are connected to the inner cavity of the annular groove 6 through the hose 12, thus allowing simultaneous evacuation of multiple cavities 11. This eliminates the need for a separate negative pressure connecting pipe 8 for each mold, simplifying the device structure and reducing installation and maintenance costs. When the hydraulic telescopic rod 10 drives the half-mold movement, the hose 12 moves synchronously with the mold, preventing pipe entanglement or pulling and ensuring the continuity and stability of the evacuation process.

[0024] The moving component includes an electric guide rail 2 fixedly mounted on the worktable 1, and the injection molding component is fixedly mounted above the electric guide rail 2. The electric guide rail 2 drives the injection molding component to dock with or separate from the injection mold.

[0025] During operation, after receiving a control signal, the electric guide rail 2 drives the injection molding assembly to move smoothly along the guide rail. Once the molding die 9 rotates to the injection station and completes the mold closing operation, the electric guide rail 2 drives the injection molding assembly towards the mold, ensuring the injection tube 23 is accurately inserted into the injection hole 14, guaranteeing smooth injection of the raw material into the cavity 11. After injection, the electric guide rail 2 drives the injection molding assembly to move in the opposite direction, quickly separating the injection tube 23 from the injection hole 14, preventing the raw material from sticking to the injection tube 23 before it cools. The high-precision displacement control of the electric guide rail 2 ensures the accuracy of the connection between the injection tube 23 and the injection hole 14, reducing material leakage or mold damage caused by misalignment. Simultaneously, its automated operation mode reduces errors from manual operation, improving the stability and reliability of the production process.

[0026] A movable cavity 22 is provided in the inner wall of the mold 9 where it connects to the hose 12. One end of the movable cavity 22 is connected to the hose 12, and the other end of the movable cavity 22 is provided with an air hole 20 that is connected to the cavity 11. A sealing head 19 is provided at the air hole 20. The sealing head 19 is slidably inserted into the air hole 20. A limiting plate 27 is fixed to the end of the sealing head 19 facing the movable cavity 22. A retaining ring 26 is fixed inside the movable cavity 22. A spring 21 is fixed between the retaining ring 26 and the limiting plate 27. The end of the sealing head 19 away from the movable cavity 22 is adapted to the inner wall contour of the cavity 11.

[0027] During operation, when the air extraction assembly begins to extract air from the cavity 11, a negative pressure is created in the movable cavity 22. Under the action of external atmospheric pressure, the limiting plate 27 overcomes the elastic force of the second spring 21 and moves into the movable cavity 22, causing the sealing head 19 to be pulled out of the air hole 20, thus opening the air hole 20. The cavity 11 is connected to the external negative pressure device through the air hole 20, the movable cavity 22, and the hose 12, realizing the air extraction operation. After the air extraction is completed, the external negative pressure device stops working, and the air pressure in the movable cavity 22 gradually returns to the normal level. The elastic force of the second spring 21 pushes the limiting plate 27 towards the air hole 20, thereby causing the sealing head 19 to re-insert into the air hole 20, sealing the air hole 20. Because the end of the sealing head 19 furthest from the active cavity 22 is adapted to the contour of the inner wall of the cavity 11, after the sealing head 19 seals the vent 20, its end can smoothly transition with the inner wall of the cavity 11, avoiding defects such as protrusions or depressions on the surface of the molded automotive parts, thus ensuring the appearance quality of the product. During the injection molding process, the molten material inside the cavity 11 will not leak through the vent 20, further ensuring the stability and reliability of the injection molding process.

[0028] The injection hole 14 is formed by the combination of corresponding grooves on two half molds. Movable plates 17 are slidably arranged on the inner walls of the two side grooves. The movable plates 17 are slidably arranged in the movable grooves 15 opened inside the half molds. A spring 16 is provided in the movable grooves 15 to reset the movable plates 17.

[0029] Triangular plates 18 are vertically fixed at the middle position of the movable plates 17 on both sides.

[0030] During operation, when the two mold halves close, the movable plates 17 on both sides approach and fit tightly together under the action of spring 16, forming a seal on the injection hole 14. This facilitates air extraction from the cavity 11 and prevents air from entering the cavity 11 through the injection hole 14, thus affecting the negative pressure effect. When the injection tube 23 is inserted into the injection hole 14, the outer wall of the injection tube 23 presses against the triangular plates 18 on both sides. Under pressure, the triangular plates 18 drive the movable plate 17 to slide into the movable groove 15, compressing spring 16. At this time, the injection hole 14 is opened, allowing the injection tube 23 to smoothly extend into the cavity 11 for injection molding. After injection molding is completed, the injection tube 23 is pulled out of the injection hole 14, spring 16 returns to its original shape, pushing the movable plate 17 back to its original position. The triangular plates 18 on both sides then fit together again, resealing the injection hole 14. This prevents air or impurities from entering the cavity 11 during cooling, ensuring the quality of the molded parts.

[0031] Example 2: Figure 6 As shown in the first comparative embodiment, another embodiment of the present invention is that a heating sleeve 25 is provided on the outside of the injection molding tube 23.

[0032] The heating sleeve 25 is slidably sleeved on the injection tube 23, and a spring 3 24 is installed on the side wall of the heating sleeve 25 to reset it.

[0033] During operation, the heating jacket 25 can be equipped with heating elements such as electric heating wires or electromagnetic heating coils. It contains an internal temperature sensor that monitors the temperature of the heating jacket 25 in real time and feeds it back to the control system, ensuring that the heating temperature remains stable within the optimal range required for the raw material to melt. The heating jacket 25 ensures that the raw material remains in a good molten state before being injected into the mold cavity 11, improving the smoothness of injection filling and molding quality. When the injection assembly approaches the molding die 9 under the drive of the moving assembly, the heating jacket 25 first contacts the outer wall of the molding die 9. As the injection tube 23 continues to be inserted into the injection hole 14, the heating jacket 25 stops moving due to the obstruction of the mold, while the injection tube 23 continues to move forward and compress the spring 3 24. At this time, the heating jacket 25 is tightly fitted at the connection between the mold and the injection tube 23, heating and insulating the end of the injection tube 23 and the area around the injection hole 14, effectively preventing the molten raw material from solidifying or becoming less fluid due to temperature drop during injection. After injection molding is completed, the moving component moves the injection tube 23 backward, and the spring 3 24 restores its deformation and pushes the heating sleeve 25 to reset together with the injection tube 23, preparing for the next operation.

[0034] The terms "front," "back," "left," "right," "top," and "bottom" all refer to the figures in the accompanying drawings. Figure 1 Based on the perspective of the observer, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0035] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0036] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An injection molding apparatus for automotive parts, characterized in that: It includes a worktable (1), an injection molding assembly, a molding assembly, and a vacuum assembly; the injection molding assembly and the molding assembly are respectively disposed on the top two sides of the worktable (1); The injection molding assembly includes an injection molding device (3), and an injection molding tube (23) is fixed on the output end of the injection molding device (3). The molding assembly includes a molding die (9), and the side wall of the molding die (9) is provided with an injection hole (14) adapted to the injection tube (23), and the injection hole (14) is connected to the cavity (11) inside the molding die (9). The workbench (1) is provided with a moving component, and the injection molding component is provided on the moving component. The moving component drives the injection molding component to move horizontally back and forth, so as to control the connection or disconnection of the injection tube (23) and the injection hole (14). The air extraction component is located on the side of the molding die (9) and is used to extract air from the cavity (11).

2. The injection molding apparatus for automotive parts according to claim 1, characterized in that: It also includes an installation component for installing and supporting the injection molding component. The installation component includes a base (4) fixed to the top of the workbench (1). A double-disc coaxial frame (5) is rotatably installed above the base (4). The double-disc coaxial frame (5) is formed by a pair of turntables and a central shaft. A motor (13) for driving the double-disc coaxial frame (5) to rotate is fixed on the base (4). Hydraulic telescopic rods (10) are fixed on the opposite side walls of the two turntables of the double-disc coaxial frame (5). The two halves of the molding mold (9) are driven to close or separate by the hydraulic telescopic rods (10) on both sides. The injection molding component is provided in multiple sets and is evenly installed in the middle of the double-disc coaxial frame (5) by the hydraulic telescopic rods (10).

3. The injection molding apparatus for automotive parts according to claim 2, characterized in that: The air extraction assembly includes an annular groove (6) fixed on the outer wall of the turntable of the double-disc coaxial frame (5). A rotating cover (7) is rotatably installed on the side wall of the annular groove (6). A connecting pipe (8) is fixed on the rotating cover (7). The connecting pipe (8) is connected to an external negative pressure device. A flexible hose (12) is fixed on the side wall of the turntable of the double-disc coaxial frame (5). One end of the flexible hose (12) is connected to the annular groove (6), and the other end of the flexible hose (12) is connected to the cavity (11) of the molding mold (9).

4. The injection molding apparatus for automotive parts according to claim 3, characterized in that: The moving component includes an electric guide rail (2) fixedly mounted on the worktable (1), and the injection molding component is fixedly mounted above the electric guide rail (2). The electric guide rail (2) drives the injection molding component to dock with or separate from the injection mold.

5. The injection molding apparatus for automotive parts according to claim 4, characterized in that: A movable cavity (22) is provided in the inner wall of the connection position between the molding die (9) and the hose (12). One end of the movable cavity (22) is connected to the hose (12), and the other end of the movable cavity (22) is provided with an air hole (20) connected to the cavity (11). A sealing head (19) is provided at the air hole (20). The sealing head (19) is slidably inserted into the air hole (20). A limiting plate (27) is fixed at the end of the sealing head (19) facing the movable cavity (22). A retaining ring (26) is fixed inside the movable cavity (22). A spring (21) is fixed between the retaining ring (26) and the limiting plate (27). The end of the sealing head (19) away from the movable cavity (22) is adapted to the inner wall contour of the cavity (11).

6. The injection molding apparatus for automotive parts according to claim 5, characterized in that: The injection hole (14) is formed by the combination of corresponding grooves on two half molds. Movable plates (17) are slidably arranged on the inner walls of the two side grooves respectively. The movable plates (17) are slidably arranged in the movable groove (15) opened inside the half mold. A spring (16) is provided in the movable groove (15) to reset the movable plates (17).

7. The injection molding apparatus for automotive parts according to claim 6, characterized in that: Triangle plates (18) are vertically fixed at the middle position of the movable plates (17) on both sides.

8. The injection molding apparatus for automotive parts according to claim 1, characterized in that: The injection tube (23) is fitted with a heating sleeve (25).

9. The injection molding apparatus for automotive parts according to claim 8, characterized in that: The heating sleeve (25) is slidably mounted on the injection tube (23), and a spring three (24) is installed on the side wall of the heating sleeve (25) to reset it.

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