A continuous core-pulling structure for injection molds of automotive headrest plastic parts

Abstract

This utility model discloses a continuous core-pulling structure for injection molds of automotive headrest plastic parts, relating to the field of automotive headrest injection mold technology. It includes a frame, with a mold fixedly connected to one side of the frame. A wear-resistant slider block is provided on one side of the frame, and a hydraulic cylinder baffle is provided on one side of the frame. A hydraulic cylinder is provided on one side of the hydraulic cylinder baffle. A first slider limiting assembly is symmetrically fixedly connected to the top of the hydraulic cylinder baffle. The top of the first slider limiting assembly is respectively provided with a sliding limit ejection switch and a sliding limit reset switch. This utility model achieves the separation of the insert block and the insertion hole through the primary movement of the slider limiting assembly driven by the hydraulic cylinder, completing the first core-pulling. Subsequently, during the mold opening process, the shovel base drives the pin to push the insert block for the second stage of core-pulling, effectively releasing the undercut portion and completely solving the demolding problem of deep cavities and undercut areas.

Description

Technical Field

[0001] This utility model relates to the field of automotive headrest injection mold technology, specifically a continuous core-pulling structure for automotive headrest plastic part injection mold. Background Technology

[0002] Automotive headrest plastic parts typically use ABS (acrylonitrile-butadiene-styrene copolymer) or HDPE (high-density polyethylene) as the main material. ABS has good impact resistance, heat resistance, and corrosion resistance, while also possessing the high gloss and easy processing of styrene, making it very suitable for the production of automotive interior parts. HDPE, due to its high thermal conductivity and adaptability to complex structures, is used in headrest molds that require high heat resistance and complex shape designs. The design and manufacturing of injection molds for automotive headrest plastic parts need to comprehensively consider multiple aspects such as material properties, mold structure, injection molding process parameters, and cooling and venting systems. Through scientific design and optimization, product quality and production efficiency can be effectively improved, meeting the high standards required for automotive interior parts.

[0003] In the existing technology, automotive headrest plastic parts are usually complex in structure, containing multiple undercut or deep rib structures. Traditional slider mechanisms mostly use a single slider core pulling method, which has problems such as incomplete core pulling and difficulty in demolding. In severe cases, it can lead to deformation of plastic parts or damage to the mold. Especially in large curved surfaces, deep cavities or combined structures, existing molds are difficult to complete molding and demolding smoothly in one go. Therefore, there is an urgent need for a slider structure that can realize step-by-step core pulling and secondary action. Utility Model Content

[0004] Based on this, the purpose of this utility model is to provide a continuous core-pulling structure for injection molds of plastic parts for automotive headrests, so as to solve the technical problems of traditional slider mechanisms that mostly use a single slider core-pulling method, which have problems such as incomplete core pulling, difficulty in demolding, and in severe cases, deformation of plastic parts or damage to the mold.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a continuous core-pulling structure for injection molds of automotive headrest plastic parts, comprising a frame, a mold fixedly connected to one side of the frame, a wear-resistant slider block provided on one side of the frame, a hydraulic cylinder baffle provided on one side of the frame, a hydraulic cylinder provided on one side of the hydraulic cylinder baffle, and a first slider limiting assembly symmetrically fixedly connected to the top of the hydraulic cylinder baffle, wherein a sliding limit ejection switch and a sliding limit reset switch are respectively provided at the top of the first slider limiting assembly.

[0006] By adopting the above technical solution, the separation of the insert block and the insertion hole is achieved through the primary movement of the slider limiting component driven by the hydraulic cylinder, completing the first core pulling. Subsequently, during the mold opening process, the shovel base drives the pin to push the insert block for the second stage of core pulling, effectively releasing the undercut part and completely solving the demolding problem of deep cavity and undercut area. The slider wear block improves the slider guiding accuracy and wear resistance. The sliding limit ejection switch and the reset switch work together to realize intelligent recognition and automatic closed-loop control of slider movement. The pin, slot and insert block form a stable limit locking structure, improving the repeatability of the mechanism and ensuring that each core pulling action is consistent and reliable. The design of the first and second locking blocks ensures that the slider module no longer interferes with the mold cavity after separation, further ensuring safe demolding. In addition, this structure does not require additional complex electrical control, but only achieves staged core pulling through mechanical linkage. The structure is simple, easy to disassemble and assemble, and suitable for customized development of various types of molds. It significantly improves the molding quality, service life and maintenance efficiency of the mold, and provides reliable and efficient technical support for injection molding of automotive interior parts.

[0007] Furthermore, the top of the frame is symmetrically provided with sliding holes, and a shovel base is slidably connected in the sliding holes.

[0008] By adopting the above technical solution, the first slider limiting assembly is driven to move outward along the sliding hole by the oil cylinder connecting rod, and a stable guiding contact relationship is formed between the slider and the slider wear block.

[0009] Furthermore, a plug block is slidably connected inside the frame, and the top of the plug block has a plug hole.

[0010] By adopting the above technical solution, the pin passes through the insert block and the slot, and applies a pushing force to the insert block, causing it to complete the second stage of sliding in the slot, thereby driving it to pull the core of the undercut structure and realize sequential demolding.

[0011] Furthermore, a first locking block is slidably connected to the top of the insert block, and a second locking block is slidably connected to the bottom of the insert block.

[0012] By adopting the above technical solution, the design of the first and second locking blocks ensures that the slider module no longer interferes with the mold cavity after disengagement, further guaranteeing the safe operation of the mold.

[0013] Furthermore, a pin is slidably connected inside the mold, and a slot is provided on one side of the pin, with a plug slidably connected inside the slot.

[0014] By adopting the above technical solution, the pin, slot and plug form a stable limit locking structure, improving the repeatability of the mechanism.

[0015] Furthermore, a cover plate is fixedly connected to the top of the pin, and a connector is slidably connected to one side of the pin.

[0016] By adopting the above technical solution, the cover plate is installed at the end of the slider assembly for dust protection, while also improving the overall strength of the slider structure. The connector ensures that the cover plate and the slider are stably fixed, preventing loosening and falling off during operation.

[0017] Furthermore, a cylinder connecting rod is provided on one side of the cylinder baffle, and one end of the cylinder connecting rod is connected to the cylinder output end.

[0018] By adopting the above technical solution, in the first stage of core pulling, the hydraulic cylinder baffle plays a role in positioning and limiting the movement of the slider, avoiding over-stroke or mold damage caused by inconsistent hydraulic cylinder stroke.

[0019] In summary, this utility model has the following beneficial effects: This utility model achieves the separation of the insert block and the insertion hole through the primary movement of the slider limiting component driven by the hydraulic cylinder, completing the first core pulling. Subsequently, during the mold opening process, the shovel base drives the pin to push the insert block for the second stage of core pulling, effectively releasing the undercut part and completely solving the demolding problem in the deep cavity and undercut area. The wear-resistant block of the slider improves the slider guiding accuracy and wear resistance. The sliding limit ejection switch and reset switch work together to achieve intelligent recognition and automatic closed-loop control of the slider movement. The pin, slot, and insert block form a stable limit locking structure, improving the repeatability of the mechanism and ensuring consistent and reliable core pulling action each time. The design of the first and second locking blocks ensures that the slider module no longer interferes with the mold cavity after separation, further ensuring safe demolding. In addition, this structure does not require additional complex electrical control; it only achieves staged core pulling through mechanical linkage. The structure is simple, easy to assemble and disassemble, and suitable for customized development of various types of molds. It significantly improves the molding quality, service life, and maintenance efficiency of the mold, providing reliable and efficient technical support for injection molding of automotive interior parts. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the exploded structure of the shovel base of this utility model;

[0022] Figure 3 This is a schematic diagram of the shovel base repositioning structure of this utility model;

[0023] Figure 4 This is a main sectional view of the present invention;

[0024] Figure 5 This is a schematic diagram of the first-view portion of the structure of this utility model;

[0025] Figure 6 This is a schematic diagram of the second-view portion of the mechanism of this utility model;

[0026] Figure 7This is an exploded view of the present invention;

[0027] Figure 8 This is a partial structural schematic diagram of the present invention.

[0028] In the diagram: 1. Frame; 2. Mold; 3. Slider wear-resistant block; 4. Cylinder baffle; 5. First slider limit assembly; 6. Second slider limit assembly; 7. Third slider limit assembly; 8. Sliding limit ejection switch; 9. Sliding limit reset switch; 10. Cylinder; 11. Sliding hole; 12. Shovel base; 13. Insert block; 14. Insert hole; 15. First locking block; 16. Second locking block; 17. Pin; 18. Slot; 19. Cover plate; 20. Connector; 21. Cylinder connecting rod. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0030] The embodiments of this utility model will be described below based on its overall structure.

[0031] A continuous core-pulling structure for injection molds of automotive headrest plastic parts, such as Figure 1-8 As shown, the system includes a frame 1, a mold 2 fixedly connected to one side of the frame 1, a slider wear-resistant block 3 set on one side of the frame 1, a hydraulic cylinder baffle 4 set on one side of the frame 1, a hydraulic cylinder 10 set on one side of the hydraulic cylinder baffle 4, and a first slider limiting assembly 5 symmetrically fixedly connected to the top of the hydraulic cylinder baffle 4. The top of the first slider limiting assembly 5 is respectively equipped with a sliding limit ejection switch 8 and a sliding limit reset switch 9. Specifically, the sliding limit ejection switch 8 and the sliding limit reset switch 9 detect in real time whether the slider has completed the core pulling action and whether it has returned to the initial reset position, providing reliable signal feedback to the control system and ensuring the closed-loop execution of the entire automated demolding process. The third slider limiting assembly 7 serves as the final reset control mechanism, precisely pulling the slider back to the initial standby position before the mold closes, preventing malfunctions from interfering with subsequent injection molding.

[0032] Please see Figure 1 and Figure 2The top of the frame 1 is symmetrically provided with sliding holes 11, and a shovel base 12 is slidably connected in the sliding holes 11. An insert block 13 is slidably connected inside the frame 1, and an insert hole 14 is provided at the top of the insert block 13. Specifically, the mold assembly is installed on the frame 1, and the mold 2 completes the mold closing injection molding process to ensure that the mold cavity structure is completely closed. After the injection molding is completed, the oil cylinder 10 starts to move, and drives the first slider limit assembly 5 to move outward along the sliding hole 11 through the oil cylinder connecting rod 21. A stable guiding contact relationship is formed between the slider and the slider wear block 3, which effectively reduces friction and wear, thereby realizing a stable and reliable core pulling motion process.

[0033] Please see Figure 4 , Figure 5 and Figure 6 The top of the insert block 13 is slidably connected to the first locking block 15, and the bottom of the insert block 13 is slidably connected to the second locking block 16. The mold 2 is slidably connected to the pin 17, and the pin 17 has a slot 18 on one side. The insert block 13 is slidably connected in the slot 18. The top of the pin 17 is fixedly connected to the cover plate 19, and the pin 17 is slidably connected to the connector 20. Specifically, as the slider continues to move outward, the insert block 13 gradually disengages from the slot 18 during the sliding, so that the deep bone structure of the plastic part that was originally locked can be released, realizing the first demolding action. At this time, the mold continues to open, and the moving mold and the fixed mold are relatively separated. The shovel base 12 is linked with the moving mold part of the mold during this process, which drives the pin 17 to move further. The pin 17 passes through the insert block 13 and the slot 14 and applies a pushing force to the insert block 13, so that it completes the second stage of sliding in the slot 14, thereby driving it to pull the core of the undercut structure and realize sequential demolding.

[0034] During the entire secondary demolding process, the second locking block 16 and the first locking block 15 gradually approach the two sides of the insert block 13. When the insert block 13 is completely disengaged from the pin 17, the two locking blocks no longer engage the module, making the movement of the insert block 13 more stable and avoiding interference or jamming between the module and the mold 2 again. This structure improves the stability and repeatability of the entire slider system.

[0035] Please see Figure 1 and Figure 6 A hydraulic cylinder connecting rod 21 is provided on one side of the hydraulic cylinder baffle 4. One end of the hydraulic cylinder connecting rod 21 is connected to the output end of the hydraulic cylinder 10. Specifically, in the first stage of core pulling, the hydraulic cylinder baffle 4 plays the role of positioning and limiting the movement of the slider, so as to avoid over-rushing or mold damage caused by inconsistent stroke of the hydraulic cylinder 10. At the same time, the first slider limiting component 5 controls the initial stroke length of the slider to ensure that the initial core pulling action is accurate and responsive.

[0036] The working principle of this utility model is as follows: When in use, the mold assembly is installed on the frame 1, the mold 2 completes the mold closing injection molding process, ensuring that the mold cavity structure is completely closed. After the injection is completed, the oil cylinder 10 starts to move, and drives the first slider limiting assembly 5 to move outward along the sliding hole 11 through the oil cylinder connecting rod 21. A stable guiding contact relationship is formed between the slider and the slider wear block 3, which effectively reduces friction and wear, thereby realizing a stable and reliable core pulling motion process.

[0037] In the first stage of core pulling, the hydraulic cylinder baffle 4 plays a role in positioning and limiting the movement of the slider, avoiding over-stroke or mold damage caused by inconsistent stroke of the hydraulic cylinder 10. At the same time, the first slider limiting component 5 controls the initial stroke length of the slider, ensuring that the initial core pulling action is accurate and responsive.

[0038] As the slider continues to move outward, the insert 13 gradually disengages from the slot 18 during the sliding process, releasing the deep bone structure of the plastic part that was originally locked, thus achieving the first demolding action. At this time, the mold continues to open, and the moving mold and the fixed mold separate relative to each other. During this process, the shovel base 12 is linked with the moving mold part of the mold, driving the pin 17 to move further. The pin 17 passes through the insert 13 and the slot 14, and applies a pushing force to the insert 13, causing it to complete the second stage of sliding in the slot 14, thereby driving it to pull the core of the undercut structure and achieve sequential demolding.

[0039] During the entire secondary demolding process, the second locking block 16 and the first locking block 15 gradually approach the two sides of the insert block 13. When the insert block 13 is completely disengaged from the pin 17, the two locking blocks no longer engage the module, making the movement of the insert block 13 more stable and avoiding interference or jamming between the module and the inside of the mold 2 again. This structure improves the stability and repeatability of the entire slider system.

[0040] Meanwhile, the sliding limit ejection switch 8 and the sliding limit reset switch 9 detect in real time whether the slider has completed the core pulling action and whether it has returned to the initial reset position, providing reliable signal feedback to the control system and ensuring the closed-loop execution of the entire automated demolding process. The third slider limit component 7, as the final reset control mechanism, accurately pulls the slider back to the initial standby position before the mold closes, preventing malfunctions from interfering with subsequent injection molding.

[0041] The pin 17, the insert block 13, and the slot 14 form a sliding locking structure with a high degree of fit, which makes it highly stable and repeatable during core pulling and reset. The cover plate 19 is installed at the end of the slider assembly for dust protection and also improves the overall strength of the slider structure. The connector 20 ensures that the cover plate and the slider are stably fixed to prevent loosening and falling off during operation.

[0042] Through the above steps, this utility model can realize step-by-step core pulling and precise demolding operations for injection molded parts with multi-layered complex structures, and is particularly suitable for the molding and processing of injection molded automotive headrests with deep cavities, undercuts and curved surfaces.

[0043] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, and variations are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. A continuous core-pulling structure for injection molds of automotive headrest plastic parts, comprising a frame (1), characterized in that: A mold (2) is fixedly connected to one side of the frame (1), a sliding wear block (3) is provided on one side of the frame (1), a hydraulic cylinder baffle (4) is provided on one side of the frame (1), a hydraulic cylinder (10) is provided on one side of the hydraulic cylinder baffle (4), and a first sliding block limiting assembly (5) is symmetrically fixedly connected to the top of the hydraulic cylinder baffle (4). A sliding limit ejection switch (8) and a sliding limit reset switch (9) are respectively provided on the top of the first sliding block limiting assembly (5).

2. The continuous core-pulling structure for injection molds of automotive headrest plastic parts according to claim 1, characterized in that: The top of the frame (1) is symmetrically provided with sliding holes (11), and a shovel base (12) is slidably connected in the sliding holes (11).

3. The continuous core-pulling structure for injection molds of automotive headrest plastic parts according to claim 1, characterized in that: The frame (1) has a sliding connection to a plug (13), and the top of the plug (13) has a plug hole (14).

4. The continuous core-pulling structure for injection molds of automotive headrest plastic parts according to claim 1, characterized in that: The top of the insert (13) is slidably connected to a first locking block (15), and the bottom of the insert (13) is slidably connected to a second locking block (16).

5. The continuous core-pulling structure for injection molds of automotive headrest plastic parts according to claim 1, characterized in that: The mold (2) has a sliding pin (17) inside, and a slot (18) is provided on one side of the pin (17), and a plug (13) is slidably connected in the slot (18).

6. The continuous core-pulling structure for injection molds of automotive headrest plastic parts according to claim 1, characterized in that: The top of the pin (17) is fixedly connected to a cover plate (19), and a connector (20) is slidably connected to one side of the pin (17).

7. The continuous core-pulling structure for injection molds of automotive headrest plastic parts according to claim 1, characterized in that: A cylinder connecting rod (21) is provided on one side of the cylinder baffle (4), and one end of the cylinder connecting rod (21) is connected to the output end of the cylinder (10).

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