Continuous core-pulling structure for automobile headrest plastic part injection mold

Abstract

The invention discloses a continuous core-pulling structure for an automobile headrest plastic part injection mold, and relates to the technical field of automobile headrest injection molds, the continuous core-pulling structure comprises a rack, one side of the rack is fixedly connected with a mold, one side of the rack is provided with a sliding block wear-resistant block, one side of the rack is provided with an oil cylinder baffle, one side of the oil cylinder baffle is provided with an oil cylinder, and the oil cylinder is provided with a sliding block wear-resistant block. First sliding block limiting assemblies are symmetrically and fixedly connected to the top end of the oil cylinder baffle, and a sliding limiting ejection switch and a sliding limiting reset switch are arranged at the top ends of the first sliding block limiting assemblies correspondingly. The oil cylinder drives the sliding block limiting assembly to move in the first stage, separation of the insertion block and the insertion hole is achieved, first-time core pulling is completed, then in the continuous mold opening process of the mold, the shovel base drives the insertion pin to push the insertion block to conduct second-stage core pulling, the inverted buckle part is effectively released, and the demolding problem of a deep cavity and an inverted buckle area is thoroughly solved.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molds for automotive headrests, and particularly to a continuous core-pulling structure for injection molds of plastic parts of automotive headrests. Background Art

[0002] Automotive headrest plastic parts usually use ABS (acrylonitrile-butadiene-styrene copolymer) or HDPE (high-density polyethylene) as the main materials. ABS has good impact resistance, heat resistance, and corrosion resistance, and at the same time has the high gloss and easy processability of styrene, which is 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 manufacture of injection molds for automotive headrest plastic parts need to comprehensively consider various aspects such as material properties, mold structure, injection process parameters, and cooling and exhaust systems. Through scientific design and optimization, the product quality and production efficiency can be effectively improved to meet the high standards of automotive interior parts.

[0003] In the prior art, automotive headrest plastic parts usually have complex structures, including multiple undercuts or deep rib structures. Traditional slider mechanisms mostly adopt a single-slider core-pulling method, which has problems such as incomplete core-pulling and difficult demolding. In severe cases, it may cause plastic part deformation or mold damage. Especially in large curved surfaces, deep cavities, or combined structures, existing molds are difficult to complete molding and smooth demolding at one time. Therefore, there is an urgent need for a slider structure that can achieve step-by-step core-pulling and secondary actions. Summary of the Invention

[0004] Based on this, the purpose of the present invention is to provide a continuous core-pulling structure for injection molds of plastic parts of automotive headrests to solve the technical problems that traditional slider mechanisms mostly adopt a single-slider core-pulling method, resulting in incomplete core-pulling and difficult demolding, and in severe cases, causing plastic part deformation or mold damage.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A continuous core-pulling structure for injection molds of plastic parts of automotive headrests, including a frame. One side of the frame is fixedly connected with a mold. One side of the frame is provided with a slider wear-resistant block. One side of the frame is provided with an oil cylinder baffle. One side of the oil cylinder baffle is provided with an oil cylinder. The top of the oil cylinder baffle is symmetrically and fixedly connected with a first slider limit component. The top of the first slider limit component is respectively provided with a sliding limit ejection switch and a sliding limit reset switch.

[0006] By adopting the above technical solutions, the first-stage movement of the slider limiting component is driven by the oil cylinder to separate the inserting block from the inserting hole, completing the first core pulling. Subsequently, during the continuous mold opening process, the lifting base drives the inserting pin to push the inserting block for the second-stage core pulling, effectively releasing the undercut part and completely solving the demolding problem in the deep cavity and undercut area. The slider wear-resistant block improves the guiding accuracy and wear resistance of the slider. The sliding limit ejection switch cooperates with the reset switch to realize the intelligent recognition and automatic closed-loop control of the slider movement. The inserting pin, inserting slot and inserting block form a stable limit locking structure, improving the repeated positioning accuracy of the mechanism and ensuring that each core pulling action is consistent and reliable. The design of the first clamping block and the second clamping block enables the slider module not to interfere with the mold cavity after separation, further ensuring the safe demolding of the mold. In addition, this structure does not require additional complex electronic control, and realizes staged core pulling only through mechanical linkage. The structure is simple, easy to disassemble and assemble, suitable for customized development of various types of molds, significantly improving the molding quality, service life and maintenance efficiency of the mold, and providing reliable and efficient technical support for the injection molding of automotive interior parts.

[0007] Further, sliding holes are symmetrically formed at the top end of the frame, and a lifting base is slidably connected in the sliding holes.

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

[0009] Further, an inserting block is slidably connected inside the frame, and an inserting hole is formed at the top end of the inserting block.

[0010] By adopting the above technical solutions, the inserting pin penetrates through the inserting block and the inserting slot, and applies a thrust to the inserting block, enabling it to complete the second-stage sliding in the inserting slot, thereby driving it to perform core pulling on the undercut structure and realizing sequential demolding.

[0011] Further, a first clamping block is slidably connected to the top end of the inserting block, and a second clamping block is slidably connected to the bottom end of the inserting block.

[0012] By adopting the above technical solutions, the design of the first clamping block and the second clamping block enables the slider module not to interfere with the mold cavity after separation, further ensuring the safe operation of the mold.

[0013] Further, an inserting pin is slidably connected inside the mold, a inserting slot is formed on one side of the inserting pin, and an inserting block is slidably connected in the inserting slot.

[0014] By adopting the above technical solutions, the inserting pin, inserting slot and inserting block form a stable limit locking structure, improving the repeated positioning accuracy of the mechanism.

[0015] Further, a cover plate is fixedly connected to the top end of the inserting pin, and a connecting piece is slidably connected to one side of the inserting pin.

[0016] By adopting the above technical solution, the cover plate is installed at the end of the slider assembly for dust prevention and protection, and at the same time, the overall strength of the slider structure is also improved. The connecting piece ensures the stable fixation of the cover plate and the slider, preventing loosening and falling off during operation.

[0017] Further, an oil cylinder connecting rod is arranged on one side of the oil cylinder baffle, and one end of the oil cylinder connecting rod is connected to the output end of the oil cylinder.

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

[0019] In summary, the present invention mainly has the following beneficial effects: The present invention realizes the separation of the insert block and the insertion hole through the primary movement of the oil cylinder-driven slider limiting component to complete the first stage of core pulling. Subsequently, during the continuous mold opening process, the shovel base drives the insertion pin to push the insert block for the second stage of core pulling, effectively releasing the undercut part and thoroughly solving the demolding problem in the deep cavity and undercut area. The slider wear-resistant block improves the guiding accuracy and wear resistance of the slider. The sliding limit ejection switch and the reset switch cooperate to realize the intelligent recognition and automatic closed-loop control of the slider movement. The insertion pin, insertion slot, and insert block form a stable limiting and locking structure, improving the repeated positioning accuracy of the mechanism and ensuring that each core pulling action is consistent and reliable. The design of the first clamping block and the second clamping block enables the slider module not to interfere with the mold cavity after detachment, further ensuring the safe demolding of the mold. In addition, this structure does not require additional complex electronic control, and only realizes staged core pulling through mechanical linkage. The structure is simple, the disassembly and assembly are convenient, it is suitable for the customized development of various types of molds, significantly improves the molding quality, service life, and maintenance efficiency of the mold, and provides reliable and efficient technical support for the injection molding of automotive interior parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is the overall structural schematic diagram of the present invention;

[0021] Figure 2 is the exploded structural schematic diagram of the shovel base of the present invention v

[0022] Figure 3 is the reset structural schematic diagram of the shovel base of the present invention;

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

[0024] Figure 5 is the partial mechanism schematic diagram of the first perspective of the present invention;

[0025] Figure 6 is the partial mechanism schematic diagram of the second perspective of the present invention;

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

[0027] Figure 8 This is a schematic diagram of the local structure of the present invention.

[0028] In the figure: 1, frame; 2, mold; 3, slider wear-resistant block; 4, oil cylinder baffle; 5, first slider limit component; 6, second slider limit component; 7, third slider limit component; 8, sliding limit ejection switch; 9, sliding limit reset switch; 10, oil cylinder; 11, sliding hole; 12, shovel base; 13, insert block; 14, insertion hole; 15, first clamping block; 16, second clamping block; 17, insertion pin; 18, slot; 19, cover plate; 20, connecting piece; 21, oil cylinder connecting rod. Specific embodiments

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0030] Next, the embodiments of the present invention will be described according to the overall structure of the present invention.

[0031] A continuous core-pulling structure for an injection mold of an automotive headrest plastic part, as Figure 1-8 shown, includes a frame 1. A mold 2 is fixedly connected to one side of the frame 1. A slider wear-resistant block 3 is provided on one side of the frame 1. An oil cylinder baffle 4 is provided on one side of the frame 1. An oil cylinder 10 is provided on one side of the oil cylinder baffle 4. First slider limit components 5 are symmetrically and fixedly connected to the top of the oil 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 slider limit components 5. 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 to ensure the closed-loop execution of the entire automated demolding process. The third slider limit component 7 serves as the final reset control mechanism, precisely pulling the slider back to the initial standby position before the mold is closed to prevent misoperation from interfering with subsequent injection molding.

[0032] Please refer to Figure 1 and Figure 2 , sliding holes 11 are symmetrically opened at the top of the frame 1. A shovel base 12 is slidably connected in the sliding holes 11. An insert block 13 is slidably connected inside the frame 1. An insertion hole 14 is opened at the top of the insert block 13. Specifically, the mold assembly is installed on the frame 1. The mold 2 completes the process of mold closing and injection molding to ensure the complete closure of the mold cavity structure. After injection molding is completed, the oil cylinder 10 starts to act, driving the first slider limit component 5 to move outward along the sliding holes 11 through the oil cylinder connecting rod 21. A stable guiding contact relationship is formed between the slider and the slider wear-resistant block 3, effectively reducing friction and wear, thereby realizing a stable and reliable core-pulling movement process.

[0033] Please refer to Figure 4 、 Figure 5 and Figure 6 As shown, a first clamping block 15 is slidably connected to the top end of the insertion block 13, a second clamping block 16 is slidably connected to the bottom end of the insertion block 13, a plug pin 17 is slidably connected inside the mold 2, a slot 18 is formed on one side of the plug pin 17, the insertion block 13 is slidably connected inside the slot 18, a cover plate 19 is fixedly connected to the top end of the plug pin 17, and a connecting member 20 is slidably connected to one side of the plug pin 17. Specifically, as the slider continues to move outwards, the insertion block 13 gradually disengages from the slot 18 during sliding, releasing the originally locked deep bone position structure of the plastic part and achieving the first demolding action. At this time, the mold continues to open, the moving mold and the fixed mold are separated relatively, the lifting base 12 is linked with the moving mold part of the mold during this process, driving the plug pin 17 to move further. The plug pin 17 penetrates through the insertion block 13 and the slot 14, and applies a thrust to the insertion block 13, causing it to complete the second-stage sliding in the slot 14, thereby driving it to perform core pulling on the undercut structure and achieving sequential demolding;

[0034] During the entire secondary demolding process, the second clamping block 16 and the first clamping block 15 gradually approach both sides of the insertion block 13. When the insertion block 13 completely disengages from the plug pin 17, the two clamping blocks no longer engage with the module at this time, making the movement of the insertion block 13 smoother and avoiding the module from interfering or jamming with the inside of the mold 2 again. This structure improves the stability and repeat positioning accuracy of the entire slider system.

[0035] Please refer to Figure 1 and Figure 6 As shown, an oil cylinder connecting rod 21 is arranged on one side of the oil cylinder baffle 4, and one end of the oil cylinder connecting rod 21 is connected to the output end of the oil cylinder 10. Specifically, in the first stage of core pulling, the oil cylinder baffle 4 plays a role in positioning and limiting the movement of the slider, avoiding overshoot or mold damage caused by inconsistent strokes of the oil cylinder 10. At the same time, the first slider limiting component 5 controls the initial stroke length of the slider, ensuring accurate displacement and sensitive response of the preliminary core pulling action.

[0036] The working principle of the present invention is as follows: During use, the mold assembly is installed on the frame 1. The mold 2 completes the process of mold closing and injection molding to ensure the complete closure of the mold cavity structure. After injection molding is completed, the oil cylinder 10 starts to act, driving the first slider limiting component 5 to move outwards 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-resistant block 3, effectively reducing friction and wear, thereby realizing a stable and reliable core pulling movement process;

[0037] In the first stage of core pulling, the oil cylinder baffle 4 plays a role in positioning and limiting the movement of the slider, avoiding overshoot or mold damage caused by inconsistent strokes of the oil cylinder 10. At the same time, the first slider limiting component 5 controls the initial stroke length of the slider, ensuring accurate displacement and sensitive response of the preliminary core pulling action;

[0038] As the slider continues to move outwards, the insert block 13 gradually disengages from the slot 18 during the sliding process, releasing the originally locked deep rib structure of the plastic part and achieving the first demolding action. At this time, the mold continues to open, and the moving mold and the fixed mold separate relatively. The lifter base 12 is linked with the moving mold part of the mold during this process, driving the further movement of the insert pin 17. The insert pin 17 penetrates through the insert block 13 and the slot 14, and applies a thrust to the insert block 13, causing it to complete the second-stage sliding in the slot 14, thereby driving it to perform core pulling on the undercut structure and achieving sequential demolding;

[0039] During the entire secondary demolding process, the second latch 16 and the first latch 15 gradually approach both sides of the insert block 13. When the insert block 13 completely disengages from the insert pin 17, the two latches no longer latch the module at this time, making the movement of the insert block 13 smoother and avoiding the module from interfering or jamming with the inside of the mold 2 again. This structure improves the stability and repeat positioning accuracy 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 to ensure the closed-loop execution of the entire automated demolding process. The third slider limit assembly 7, as the final reset control mechanism, precisely pulls the slider back to the initial standby position before the mold closes, preventing misoperation from interfering with subsequent injection molding;

[0041] The insert pin 17 and the insert block 13, the slot 14 form a sliding locking structure with a high degree of fit, making it highly stable and repeatable during the core pulling and resetting processes. The cover plate 19 is installed at the end of the slider assembly for dust prevention and protection, and at the same time also improves the overall strength of the slider structure. The connecting piece 20 ensures the stable fixation of the cover plate and the slider, preventing loosening and falling off during operation;

[0042] Through the above steps, the present invention can achieve step-by-step core pulling and precise demolding operations for injection molded parts with multi-level complex structures, and is particularly suitable for the molding and processing of injection molded parts such as automotive headrests with deep cavities, undercuts, and curved surface structures.

[0043] Although the embodiments of the present invention have been shown and described, the specific embodiments are only explanations of the present invention and are not limitations of the invention. The specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art can make modifications, substitutions, and variations that do not make creative contributions to the embodiments according to needs, but as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A continuous core-pulling structure for an injection mold of an automotive headrest plastic part, comprising a frame (1), characterized in that: One side of the frame (1) is fixedly connected with a mold (2). One side of the frame (1) is provided with a slider wear-resistant block (3). One side of the frame (1) is provided with an oil cylinder baffle (4). One side of the oil cylinder baffle (4) is provided with an oil cylinder (10). The top of the oil cylinder baffle (4) is symmetrically and fixedly connected with a first slider limiting component (5). The top of the first slider limiting component (5) is respectively provided with a sliding limit ejection switch (8) and a sliding limit reset switch (9).

2. The continuous core-pulling structure for the injection mold of the automotive headrest plastic part 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 the injection mold of the automotive headrest plastic part according to claim 1, characterized in that: An inserting block (13) is slidably connected inside the frame (1), and an inserting hole (14) is opened at the top of the inserting block (13).

4. The continuous core-pulling structure for the injection mold of the automotive headrest plastic part according to claim 1, wherein: A first clamping block (15) is slidably connected to the top of the inserting block (13), and a second clamping block (16) is slidably connected to the bottom of the inserting block (13).

5. The continuous core-pulling structure for an injection mold of a plastic automotive headrest part according to claim 1, wherein: An inserting pin (17) is slidably connected inside the mold (2). A slot (18) is opened on one side of the inserting pin (17), and the inserting block (13) is slidably connected in the slot (18).

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

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

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