Partitioned ejection injection mold for automobile plastic parts
By designing a partitioned ejection injection mold, hydraulic cylinders and electric push rods are used to drive independent ejection partitions. Combined with telescopic rods and spring supports, the problem of uneven force on plastic parts in traditional molds is solved, achieving a high-quality and efficient demolding process.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- LIJIN PRECISION MOULD (ZHEJIANG) CO LTD
- Filing Date
- 2025-05-22
- Publication Date
- 2026-04-17
AI Technical Summary
Traditional automotive plastic injection molds are difficult to precisely control based on the structural characteristics and demolding requirements of different parts, resulting in uneven stress on the plastic parts during demolding, leading to quality problems such as deformation and cracking, which affects product qualification rate and production efficiency.
The injection mold adopts a partitioned ejection system, which uses hydraulic cylinders and electric push rods to drive independent ejection partitions. The ejection is carried out in partitions according to the demolding difficulty and stress requirements of different parts of the plastic part. Combined with telescopic rods and springs, support and buffering are provided to ensure uniform force distribution.
It improved the molding quality and product qualification rate of plastic parts, simplified the demolding process, shortened the production cycle, reduced production costs, and enhanced the competitiveness of enterprises.
Smart Images
Figure CN224130342U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of injection mold technology, and in particular to a partitioned ejection injection mold for automotive plastic parts. Background Technology
[0002] In the automotive manufacturing industry, plastic parts are widely used in automotive interiors, exteriors, and components due to their advantages such as light weight, low cost, and good moldability. Injection molds, as key equipment in the molding of automotive plastic parts, directly affect the quality and production efficiency of these parts. Traditional automotive plastic injection molds typically use a single ejection mechanism to demold the molded plastic parts. This ejection method makes it difficult to precisely control the demolding process for different structural features and demolding requirements of different parts of the automotive plastic part. In actual production, due to the complex shapes of automotive plastic parts, the demolding difficulty and stress requirements vary from part to part. Using traditional ejection mechanisms easily leads to uneven stress on the plastic parts during demolding, resulting in quality problems such as deformation and cracking. This seriously affects product qualification rate and production efficiency, increasing production costs.
[0003] Therefore, we propose a partitioned ejection injection mold for automotive plastic parts. Utility Model Content
[0004] The main purpose of this utility model is to provide a partitioned ejection injection mold for automotive plastic parts. In order to prevent quality problems such as deformation and cracking of automotive plastic parts due to uneven force during demolding, thereby improving the product qualification rate, and at the same time optimizing the demolding process, reducing problems such as long production cycle caused by high demolding resistance, thereby improving injection molding production efficiency and reducing enterprise production costs, it can effectively solve the problems in the background art.
[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0006] An automotive plastic part partition ejection injection mold includes a fixed mold assembly and a moving mold assembly. After the fixed mold assembly and the moving mold assembly are closed, a cavity for molding automotive plastic parts is formed. The fixed mold assembly includes a fixed mold base plate and a fixed mold plate, with the fixed mold base plate fixedly connected to the top of the fixed mold plate. The moving mold assembly includes a moving mold base plate and a moving mold plate, with the moving mold base plate fixedly connected to the bottom of the moving mold plate.
[0007] The inner side of the moving mold base plate has a bottom plate that moves up and down. The top of the bottom plate has a movable plate. The top of the bottom plate has two first top columns that penetrate the movable plate. The moving mold base plate has two hydraulic cylinders for driving the first top columns to move up and down. The top of the hydraulic cylinders has a top plate that is fixedly connected. The top of the top plate has a partition ejection mechanism. The moving mold plate has mounting holes that cooperate with the ejection mechanism.
[0008] The partition ejection mechanism includes multiple ejection partitions, ejector plate assemblies, and ejector pins. The multiple ejection partitions are independent of each other. The ejector plate assembly includes an upper ejector plate and a lower ejector plate corresponding to each ejection partition. The ejector pins are mounted on the upper ejector plate. Each lower ejector plate is vertically fixedly connected to two second ejector pins that pass through the upper ejector plate. The ejector plate is provided with an electric push rod for driving the second ejector pins to move up and down.
[0009] By adopting the above technical solution, the fixed mold assembly and the moving mold assembly are closed. The fixed mold assembly, composed of the fixed mold base plate and the fixed template, and the moving mold assembly, composed of the moving mold base plate and the moving template, together form a cavity for molding automotive plastic parts. The injection molding machine injects molten plastic into the cavity, and the plastic parts are molded after cooling and solidification.
[0010] After injection molding is completed, the moving mold and the fixed mold separate. The two hydraulic cylinders on the moving mold base plate are activated, and the piston rods extend to push the first ejector pin upward. The first ejector pin passes through the moving plate and drives the base plate and the moving plate to rise together. This causes the ejector plate to initially lift the molded plastic part from the core of the moving mold plate, reducing the adhesion and friction between the plastic part and the core, thus creating conditions for subsequent operations.
[0011] After the top plate is raised to the position, the electric push rods at the top start to operate. Each electric push rod corresponds to an ejection zone. By driving the second ejector pin to move up and down, it drives the lower ejector plate and the upper ejector plate to move. Since each ejection zone is independent of each other, the electric push rods can control the movement of the ejector plates of each zone according to the demolding difficulty and force requirements of different parts of the automotive plastic parts. The ejector pins installed on the upper ejector plate move with the upper ejector plate and eject the corresponding parts of the plastic parts, realizing zoned ejection, ensuring that the plastic parts are subjected to uniform force during demolding, and preventing deformation and cracking.
[0012] After the plastic part is ejected, the injection molding machine closes the mold, and the hydraulic cylinder and electric push rod move in opposite directions, driving the top plate, ejector plate assembly and other components to move down and return to their initial positions, preparing for the next injection.
[0013] Furthermore, telescopic rods are vertically fixedly connected to the four corners of the bottom inner wall of the moving mold base plate, and the top of the telescopic rods passes through the bottom plate and the moving plate and is fixedly connected to the bottom of the top plate.
[0014] By adopting the above technical solution, during mold operation, the bottom end of the telescopic rod is fixed to the four corners of the inner wall of the bottom end of the moving mold base plate, and the top end passes through the bottom plate and the moving plate, connecting the bottom end of the top plate. During the ejection process, the hydraulic cylinder drives the first ejector pin to move the top plate, bottom plate and moving plate upwards, and the telescopic rod extends synchronously. With its own rigidity, it provides vertical support for the top plate and other components, ensuring uniform and stable force. At the same time, its through-through design restricts the movement trajectory of the top plate and other components, so that they can only move along the axial direction of the telescopic rod, preventing deviation and shaking during the ejection process, ensuring ejection accuracy, and helping the ejector pin to accurately eject the plastic part. When the mold is closed and reset, the telescopic rod can guide the top plate and other components to accurately return to their positions, preparing for the next injection molding.
[0015] Furthermore, a first spring is sleeved on the outside of the telescopic rod, and the first spring is located between the moving plate and the top plate.
[0016] By adopting the above technical solution, when the hydraulic cylinder drives the first ejector pin to move the ejector plate upward for initial ejection, the ejector plate will squeeze the first spring to compress it. During the ejection process, if there is a large local adhesion force between the plastic part and the mold, causing a sudden change in the force on the ejector plate, the first spring can absorb part of the impact force through its own elastic deformation, preventing the ejector plate, ejector pin plate assembly and other components from being damaged due to excessive instantaneous force. At the same time, it can also prevent the plastic part from deforming or cracking due to uneven force, providing buffer protection for the ejection action.
[0017] After the ejection action is completed, the injection molding machine performs the mold closing operation. The hydraulic cylinder and electric push rod move in opposite directions to drive the top plate and other components to move down and reset. At this time, the first spring, which is in a compressed state, begins to recover its deformation and release elastic potential energy, providing auxiliary thrust for the reset of the top plate, so that the top plate, moving plate and other components can return to the initial position more quickly and accurately, improving the working efficiency of the mold.
[0018] Throughout the entire mold operation, the first spring remains under a certain compression state, providing elastic support between the top plate and the moving plate, thus enhancing the stability of the connection between them. During ejection and resetting, even if subjected to some external interference or minor errors between components, the first spring can adjust the relative position of the top plate and the moving plate through its elastic force, maintaining the smooth operation of the entire ejection mechanism and further ensuring the accuracy and reliability of the ejection action.
[0019] Furthermore, the lower part of the inner wall on both sides of the moving mold base plate is provided with a first stop block for limiting the moving plate, and the upper part of the inner wall on both sides of the moving mold base plate is provided with a second stop block for limiting the upper ejector plate.
[0020] By adopting the above technical solution, when the hydraulic cylinder drives the first ejector pin to move the base plate and the moving plate upward for initial ejection, the first stop is set at the lower part of the inner wall on both sides of the moving mold base plate, which can limit the upward stroke of the moving plate. When the moving plate rises to contact the first stop, it cannot continue to move upward, ensuring that the moving plate and the connected parts stop moving at the specified position, avoiding damage to the top plate, ejector plate assembly and other parts due to excessive rising, or collision and interference with other parts of the mold, ensuring the accuracy of the initial ejection action and the safety of the mold structure. At the same time, during the mold closing and reset stage, the first stop can also assist the moving plate to accurately return to the initial position, preventing the moving plate from descending excessively.
[0021] The second stop limits the upper ejector plate: When the electric push rod drives the second ejector pin to push the lower and upper ejector plates out in sections, the second stop is located on the upper part of the inner wall on both sides of the moving mold base plate. It is used to limit the upper ejector plate to move upward to its limit position. When the upper ejector plate rises to contact the second stop, it can no longer rise. This accurately controls the ejection distance of the ejector pins, avoids excessive force when the ejector pins push out the plastic parts, and prevents the plastic parts from being punctured, deformed, or other quality problems. It also protects the ejector pins from bending or breaking due to excessive ejection, ensuring that the section ejection process is carried out according to the predetermined stroke and force, and ensuring the molding quality of automotive plastic parts and the normal service life of the mold.
[0022] Furthermore, each of the four corners of the top of the top plate is vertically fixed with a tie rod, the top of which passes through the lower ejector plate, the upper ejector plate and the moving template.
[0023] By adopting the above technical solution, the bottom end of the secondary tie rod is fixedly connected to the four corners of the top of the top plate, and passes through the lower ejector plate, the upper ejector plate and the moving mold plate. The electric push rod drives the second ejector column to move the lower ejector plate and the upper ejector plate upward. The secondary tie rod provides vertical support for the lower ejector plate, the upper ejector plate and other components with its own rigidity, ensuring uniform and stable force. At the same time, its through-through design restricts the movement trajectory of the lower ejector plate, the upper ejector plate and other components, so that they can only move along the axial direction of the secondary tie rod, preventing deviation and shaking during the ejection process, ensuring ejection accuracy, and helping the ejector pins to accurately eject the plastic parts. When the mold is closed and reset, the secondary tie rod can also guide the lower ejector plate, the upper ejector plate and other components to accurately return to their positions, preparing for the next injection molding.
[0024] Furthermore, a second spring is sleeved on the outside of the tie rod, and the second spring is located between the moving template and the upper ejector plate.
[0025] By adopting the above technical solution, when the electric push rod drives the ejector plate assembly to eject in sections, if the adhesion force between the plastic part and the mold is large in a certain area, the upper ejector plate will be subjected to instantaneous impact during the upward movement. At this time, the second spring will be compressed and absorb the impact force through its own elastic deformation, so as to prevent the upper ejector plate, ejector pin and other components from being damaged due to excessive force, and at the same time prevent the plastic part from deforming or breaking due to excessive local force, thus providing buffer protection for the ejection process.
[0026] During long-term use of the mold, small gaps may appear in various parts due to wear, affecting the ejection accuracy. The second spring is always in a certain compressed state, and its elastic force can automatically compensate for these gaps, ensuring that the upper ejector plate, lower ejector plate and other parts fit tightly together, so that the ejector pins can accurately contact and push the corresponding parts of the plastic part each time they are ejected, maintaining the stability and reliability of the ejection action.
[0027] After the ejection action is completed, the injection molding machine closes the mold. During this process, the second spring, which is in a compressed state, recovers its deformation and releases its elastic potential energy, providing an auxiliary thrust for the upper ejector plate to reset and speeding up the reset speed. At the same time, the elastic force of the second spring can make the upper ejector plate return to its initial position more accurately, reducing the reset deviation caused by inertia or friction between parts, and ensuring that the mold can smoothly carry out the next injection molding operation.
[0028] Compared with the prior art, the present invention has the following beneficial effects:
[0029] (1) This utility model provides a partitioned ejection injection mold for automotive plastic parts. By setting multiple independent ejection partitions, the second ejector is driven by an electric push rod, which in turn drives the ejector plate assembly to move. This allows the ejector pins to eject independently according to the demolding difficulty and force requirements of different parts of the automotive plastic parts. This partitioned ejection method ensures that the plastic parts are subjected to uniform force during demolding, effectively avoiding problems such as deformation and cracking caused by uneven force. It significantly improves the molding quality and product qualification rate of automotive plastic parts, and meets the production needs of the automotive manufacturing industry for high-quality plastic parts.
[0030] (2) This utility model provides a partitioned ejection injection mold for automotive plastic parts. It is designed with a step-by-step ejection structure. First, the first ejector is driven by a hydraulic cylinder, which drives the ejector plate to initially lift the molded plastic part from the core of the moving template, reducing the adsorption force and friction between the plastic part and the core. Then, the electric push rod drives the ejector plate assembly to achieve partitioned ejection. This step-by-step ejection design simplifies the demolding process, reduces demolding resistance, enables the plastic part to be demolded quickly and smoothly, shortens the production cycle, improves injection molding efficiency, reduces the production cost of enterprises, and enhances the competitiveness of enterprises in the market. Attached Figure Description
[0031] Figure 1This is a schematic diagram of the structure of a partitioned ejection injection mold for automotive plastic parts according to this utility model.
[0032] Figure 2 This is a schematic diagram of the internal structure of a partitioned ejection injection mold for automotive plastic parts according to this utility model.
[0033] In the diagram: 1. Fixed mold assembly; 2. Moving mold assembly; 3. Cavity; 4. Fixed mold base plate; 5. Fixed template; 6. Moving mold base plate; 7. Moving template; 8. Base plate; 9. Moving plate; 10. Hydraulic cylinder; 11. First ejector pin; 12. Ejector plate; 13. Lower ejector plate; 14. Upper ejector plate; 15. Second ejector pin; 16. Electric push rod; 17. Ejector pin; 18. Telescopic rod; 19. First spring; 20. First stop block; 21. Second stop block; 22. Reverse pull rod; 23. Second spring. Detailed Implementation
[0034] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.
[0035] To prevent quality issues such as deformation and cracking of automotive plastic parts during demolding due to uneven stress, thereby improving product yield and optimizing the demolding process to reduce long production cycles caused by high demolding resistance, thus increasing injection molding efficiency and reducing enterprise production costs, such as... Figure 1 , Figure 2 As shown, a partitioned ejection injection mold for automotive plastic parts includes a fixed mold assembly 1 and a moving mold assembly 2. After the fixed mold assembly 1 and the moving mold assembly 2 are closed, a cavity 3 for molding automotive plastic parts is formed. The fixed mold assembly 1 includes a fixed mold base plate 4 and a fixed mold plate 5. The fixed mold base plate 4 is fixedly connected to the top of the fixed mold plate 5. The moving mold assembly 2 includes a moving mold base plate 6 and a moving mold plate 7. The moving mold base plate 6 is fixedly connected to the bottom of the moving mold plate 7.
[0036] The inner side of the moving mold base plate 6 has a base plate 8 that moves up and down. The top of the base plate 8 is provided with a moving plate 9. The top of the base plate 8 is vertically fixedly connected to two first top columns 11 that penetrate the moving plate 9. The moving mold base plate 6 is provided with two hydraulic cylinders 10 for driving the first top columns 11 to move up and down. The top of the hydraulic cylinders 10 is fixedly connected to a top plate 12. The top of the top plate 12 is provided with a partition ejection mechanism. The moving mold plate 7 is provided with mounting holes that cooperate with the ejection mechanism.
[0037] The partition ejection mechanism includes multiple ejection partitions, ejector plate assemblies, and ejector pins 17. The multiple ejection partitions are independent of each other. The ejector plate assembly includes an upper ejector plate 14 and a lower ejector plate 13 corresponding to each ejection partition. The ejector pins 17 are mounted on the upper ejector plate 14. Each lower ejector plate 13 is vertically fixedly connected to two second ejector columns 15 that pass through the upper ejector plate 14. The top plate 12 is provided with an electric push rod 16 for driving the second ejector columns 15 to move up and down.
[0038] In use, the fixed mold assembly 1 and the moving mold assembly 2 are closed. The fixed mold assembly, composed of the fixed mold base plate 4 and the fixed mold plate 5, and the moving mold assembly, composed of the moving mold base plate 6 and the moving mold plate 7, together form the cavity 3 for molding automotive plastic parts. The injection molding machine injects molten plastic into the cavity 3, and the plastic parts are molded after cooling and solidification.
[0039] After injection molding is completed, the moving mold separates from the fixed mold. The two hydraulic cylinders 10 on the moving mold base plate 6 are activated, and the piston rods extend to push the first ejector 11 upward. The first ejector 11 passes through the moving plate 9, causing the base plate 8 and the moving plate 9 to rise together. This allows the ejector plate 12 to initially lift the molded plastic part from the core of the moving mold plate 7, reducing the adhesion and friction between the plastic part and the core, thus creating conditions for subsequent operations.
[0040] After the top plate 12 rises to its position, the electric push rod 16 at its top starts to operate. Each electric push rod 16 corresponds to an ejection zone. By driving the second ejector pin 15 to move up and down, it drives the lower ejector plate 13 and the upper ejector plate 14 to move. Since each ejection zone is independent of each other, the electric push rod 16 can control the movement of the ejector plate of each zone according to the demolding difficulty and force requirements of different parts of the automotive plastic parts. The ejector pin 17 installed on the upper ejector plate 14 moves with the upper ejector plate 14 to eject the corresponding part of the plastic part, realizing zoned ejection, ensuring that the plastic part is subjected to uniform force during demolding, and preventing deformation and cracking.
[0041] After the plastic part is ejected, the injection molding machine closes the mold, and the hydraulic cylinder 10 and the electric push rod 16 move in opposite directions, driving the top plate 12, ejector plate assembly and other components to move down and return to their initial positions, preparing for the next injection.
[0042] For example, such as Figure 2 As shown, the present invention also includes a telescopic rod 18 vertically fixedly connected to the four corners of the bottom inner wall of the moving mold base plate 6. The top end of the telescopic rod 18 passes through the bottom plate 8 and the moving plate 9 and is fixedly connected to the bottom end of the top plate 12.
[0043] During use, when the mold is running, the bottom end of the telescopic rod 18 is fixed to the four corners of the inner wall of the bottom end of the moving mold base plate 6, and the top end passes through the bottom plate 8 and the moving plate 9, connecting the bottom end of the top plate 12. During the ejection process, the hydraulic cylinder 10 drives the first ejector pin 11 to move the top plate 12, the bottom plate 8 and the moving plate 9 upward. The telescopic rod 18 extends synchronously, providing vertical support for the top plate 12 and other components with its own rigidity, ensuring uniform and stable force. At the same time, its through-through design restricts the movement trajectory of the top plate 12 and other components, so that they can only move along the axial direction of the telescopic rod 18, preventing deviation and shaking during the ejection process, ensuring ejection accuracy, and helping the ejector pin 17 to accurately eject the plastic part. When the mold is closed and reset, the telescopic rod 18 can also guide the top plate 12 and other components to accurately return to their original positions, preparing for the next injection molding.
[0044] For example, such as Figure 2 As shown, the present invention also includes a first spring 19 sleeved on the outside of the telescopic rod 18, the first spring 19 being located between the movable plate 9 and the top plate 12.
[0045] In use, when the hydraulic cylinder 10 drives the first ejector pin 11 to move the ejector plate 12 upward for initial ejection, the ejector plate 12 will compress the first spring 19. During the ejection process, if there is a large local adhesion force between the plastic part and the mold, causing a sudden change in the force on the ejector plate 12, the first spring 19 can absorb part of the impact force through its own elastic deformation, preventing damage to the ejector plate 12, ejector plate assembly and other components due to excessive instantaneous force. At the same time, it can also prevent the plastic part from deforming or cracking due to uneven force, providing buffer protection for the ejection action.
[0046] After the ejection action is completed, the injection molding machine performs the mold closing operation. The hydraulic cylinder 10 and the electric push rod 16 move in opposite directions to drive the top plate 12 and other components to move down and reset. At this time, the first spring 19, which is in a compressed state, begins to recover its deformation and releases elastic potential energy, providing auxiliary thrust for the reset of the top plate 12, so that the top plate 12, the moving plate 9 and other components can return to the initial position more quickly and accurately, improving the working efficiency of the mold.
[0047] Throughout the entire mold operation, the first spring 19 remains in a certain compressed state, providing elastic support between the top plate 12 and the moving plate 9, thus enhancing the stability of the connection between them. During the ejection and resetting process, even if subjected to some external interference or minor errors between components, the first spring 19 can adjust the relative position of the top plate 12 and the moving plate 9 through elastic force, maintaining the smooth operation of the entire ejection mechanism and further ensuring the accuracy and reliability of the ejection action.
[0048] For example, such as Figure 2As shown, the present invention also includes a first stop 20 for limiting the moving plate 9 on the lower part of the inner walls on both sides of the moving mold base plate 6, and a second stop 21 for limiting the upper ejector plate 14 on the upper part of the inner walls on both sides of the moving mold base plate 6.
[0049] In use, when the hydraulic cylinder 10 drives the first ejector pin 11 to move the base plate 8 and the moving plate 9 upward for initial ejection, the first stop block 20 is set on the lower part of the inner wall on both sides of the moving mold base plate 6, which can limit the upward stroke of the moving plate 9. When the moving plate 9 rises to contact the first stop block 20, it can no longer move upward, ensuring that the moving plate 9 and the connected parts stop moving at the specified position, avoiding damage to the top plate 12, ejector plate assembly and other parts due to excessive rising, or collision and interference with other parts of the mold, ensuring the accuracy of the initial ejection action and the safety of the mold structure. At the same time, during the mold closing and reset stage, the first stop block 20 can also assist the moving plate 9 to accurately return to the initial position, preventing the moving plate 9 from descending excessively.
[0050] The second stop 21 limits the upper ejector plate 14: When the electric push rod 16 drives the second ejector pin 15 to drive the lower ejector plate 13 and the upper ejector plate 14 to perform partitioned ejection, the second stop 21 is located on the upper part of the inner wall on both sides of the moving mold base plate 6. It is used to limit the upper ejector plate 14 to move upward to the limit position. When the upper ejector plate 14 rises to contact the second stop 21, it can no longer rise. This accurately controls the ejection distance of the ejector pin 17, avoids excessive force when the ejector pin 17 ejects the plastic part, and prevents the plastic part from being punctured, deformed, or other quality problems. It also protects the ejector pin 17 from bending or breaking due to excessive ejection, ensuring that the partitioned ejection process is carried out according to the predetermined stroke and force, and ensuring the molding quality of automotive plastic parts and the normal service life of the mold.
[0051] For example, such as Figure 1 As shown, the present invention also includes a tie rod 22 vertically fixedly connected at each of the four corners of the top of the top plate 12, and the top of the tie rod 22 passes through the lower ejector plate 13, the upper ejector plate 14 and the moving template 7.
[0052] In use, the bottom end of the secondary pull rod 22 is fixedly connected to the four corners of the top of the top plate 12, and passes through the lower ejector plate 13, the upper ejector plate 14 and the moving platen 7. The electric push rod 16 drives the second ejector column 15 to move the lower ejector plate 13 and the upper ejector plate 14 upward. The secondary pull rod 22 provides vertical support for the lower ejector plate 13, the upper ejector plate 14 and other components with its own rigidity, ensuring uniform and stable force. At the same time, its through-through design restricts the movement trajectory of the lower ejector plate 13, the upper ejector plate 14 and other components, so that they can only move along the axial direction of the secondary pull rod 22, preventing deviation and shaking during the ejection process, ensuring ejection accuracy, and helping the ejector pin 17 to accurately eject the plastic part. When the mold is closed and reset, the secondary pull rod 22 can also guide the lower ejector plate 13, the upper ejector plate 14 and other components to accurately return to their positions, preparing for the next injection molding.
[0053] For example, such as Figure 1 As shown, the present invention also includes a second spring 23 sleeved on the outside of the pull rod 22, the second spring 23 being located between the moving template 7 and the upper ejector plate 14.
[0054] When in use, if the plastic part has a large adhesion force to the mold in a certain area when the electric push rod 16 drives the ejector plate assembly to eject in sections, the upper ejector plate 14 will be subjected to instantaneous impact during the upward movement. At this time, the second spring 23 will be compressed and absorb the impact force through its own elastic deformation, so as to prevent the upper ejector plate 14, ejector pin 17 and other components from being damaged due to excessive force. At the same time, it prevents the plastic part from deforming or breaking due to excessive local force, and provides buffer protection for the ejection process.
[0055] During long-term use of the mold, small gaps may be generated in various parts due to wear, affecting the ejection accuracy. The second spring 23 is always in a certain compressed state, and can automatically compensate for these gaps with its elastic force, ensuring that the upper ejector plate 14, lower ejector plate 13 and other parts are closely matched, so that the ejector pin 17 can accurately contact and push the corresponding part of the plastic part each time it is ejected, maintaining the stability and reliability of the ejection action.
[0056] After the ejection action is completed, the injection molding machine closes the mold. During this process, the second spring 23, which is in a compressed state, recovers its deformation and releases elastic potential energy, providing an auxiliary thrust for the reset of the upper ejector plate 14 and accelerating the reset speed. At the same time, the elastic force of the second spring 23 can make the upper ejector plate 14 return to the initial position more accurately, reducing the reset deviation caused by inertia or friction between parts, and ensuring that the mold can smoothly carry out the next injection molding operation.
[0057] It should be noted that this utility model is a partitioned ejection injection mold for automotive plastic parts. The fixed mold assembly consists of a fixed mold base plate 4 and a fixed mold plate 5, and the moving mold assembly consists of a moving mold base plate 6 and a moving mold plate 7. The mold is closed to form a cavity 3 for molding automotive plastic parts. The injection molding machine injects molten plastic into the cavity 3, and the plastic parts are molded after cooling and solidification.
[0058] After injection molding is completed, the moving mold separates from the fixed mold. The two hydraulic cylinders 10 on the moving mold base plate 6 are activated, and the piston rods extend to push the first ejector 11 upward, which in turn drives the base plate 8 and the moving plate 9 to rise together. This causes the ejector plate 12 to initially lift the molded plastic part from the core of the moving mold plate 7, reducing the adhesion and friction between the plastic part and the core.
[0059] After the top plate 12 rises to its position, the electric push rod 16 at its top starts to operate. Each electric push rod 16 corresponds to an ejection section. By driving the second push column 15 to move up and down, it drives the lower ejector plate 13 and the upper ejector plate 14 to move. Each section ejector plate moves independently, and the ejector pin 17 installed on the upper ejector plate 14 moves up accordingly, ejecting the corresponding part of the plastic part, realizing the partition ejection, and ensuring that the plastic part is subjected to uniform force when demolding.
[0060] After the plastic part is ejected, the injection molding machine closes the mold, and the hydraulic cylinder 10 and the electric push rod 16 move in opposite directions, driving the top plate 12, ejector plate assembly and other components to move down and return to the initial position, in preparation for the next injection.
[0061] Telescopic rod 18: When the mold is running, the bottom end of the telescopic rod 18 is fixed to the four corners of the inner wall of the bottom end of the moving mold base plate 6, and the top end is connected to the bottom end of the top plate 12. It extends synchronously when ejecting, providing vertical support, limiting the movement trajectory, ensuring ejection accuracy, and guiding the components to return to their precise positions when the mold is closed and reset.
[0062] When the top plate 12 moves upward and initially ejects, the first spring 19 is compressed. When encountering adhesive forces or other situations, it absorbs the impact force and protects the components and plastic parts. When the mold is closed and reset, it releases elastic potential energy to assist the top plate 12 in resetting, while enhancing the connection stability between the top plate 12 and the moving plate 9, ensuring the smooth operation of the ejection mechanism.
[0063] The first stop 20 limits the upward movement of the moving plate 9 to ensure the accuracy of the initial ejection action and the safety of the mold, and assists in resetting; the second stop 21 limits the upward movement of the upper ejector plate 14 to the limit position, controls the ejection distance of the ejector pin 17, and ensures the molding quality of the plastic part and the service life of the mold.
[0064] When the electric push rod 16 drives the ejector plate assembly to move upward, the tie rod 22 provides vertical support, restricts the movement trajectory, ensures ejection accuracy, and guides the components to accurately return to their positions during mold closing and reset.
[0065] When ejecting from a partition, if the local adhesion force of the plastic part is large, the second spring 23 is compressed to absorb the impact force, protecting the parts and the plastic part; during long-term use, it compensates for the wear gap of the parts and maintains the ejection stability; during reset, it releases elastic potential energy to assist the upper ejector plate 14 in reset and reduce reset deviation.
[0066] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A sectional ejection injection mould for plastic parts of automobiles, comprising a fixed mould assembly (1) and a movable mould assembly (2), characterised in that, After the fixed mold assembly (1) and the moving mold assembly (2) are closed, a cavity (3) for molding automotive plastic parts is formed. The fixed mold assembly (1) includes a fixed mold base plate (4) and a fixed mold plate (5). The fixed mold base plate (4) is fixedly connected to the top of the fixed mold plate (5). The moving mold assembly (2) includes a moving mold base plate (6) and a moving mold plate (7). The moving mold base plate (6) is fixedly connected to the bottom of the moving mold plate (7). The inner side of the moving mold base plate (6) has a base plate (8) that moves up and down. The top of the base plate (8) is provided with a moving plate (9). The top of the base plate (8) is vertically fixedly connected to two first top columns (11) that penetrate the moving plate (9). The moving mold base plate (6) is provided with two hydraulic cylinders (10) for driving the first top columns (11) to move up and down. The top of the hydraulic cylinders (10) is fixedly connected to a top plate (12). The top of the top plate (12) is provided with a partition ejection mechanism. The moving mold plate (7) is provided with mounting holes that cooperate with the ejection mechanism. The partition ejection mechanism includes multiple ejection partitions, ejector plate assemblies, and ejector pins (17). The multiple ejection partitions are independent of each other. The ejector plate assembly includes an upper ejector plate (14) and a lower ejector plate (13) corresponding to each ejection partition. The ejector pins (17) are mounted on the upper ejector plate (14). Each lower ejector plate (13) is vertically fixedly connected to two second ejector pins (15) that pass through the upper ejector plate (14). The ejector plate (12) is provided with an electric push rod (16) for driving the second ejector pins (15) to move up and down.
2. The sectional ejection injection mold for plastic parts of an automobile according to claim 1, characterized in that: The bottom inner wall of the moving mold base plate (6) is vertically fixedly connected with telescopic rods (18) at the four corners. The top of the telescopic rods (18) passes through the bottom plate (8) and the moving plate (9) and is fixedly connected to the bottom of the top plate (12).
3. The sectional ejection injection mold for plastic parts of an automobile according to claim 2, characterized in that: The telescopic rod (18) is fitted with a first spring (19), which is located between the moving plate (9) and the top plate (12).
4. The sectional ejection injection mold for plastic parts of an automobile according to claim 1, characterized in that: The lower part of the inner wall on both sides of the moving mold base plate (6) is provided with a first stop (20) for limiting the moving plate (9), and the upper part of the inner wall on both sides of the moving mold base plate (6) is provided with a second stop (21) for limiting the upper ejector plate (14).
5. The sectional ejection injection mold for plastic parts of an automobile according to claim 1, characterized in that: The top of the top plate (12) is vertically fixed at each of the four corners with a tie rod (22), and the top of the tie rod (22) passes through the lower ejector plate (13), the upper ejector plate (14) and the moving template (7).
6. The sectional ejection injection mold for plastic parts of an automobile according to claim 5, characterized in that: The outer side of the pull rod (22) is fitted with a second spring (23), which is located between the moving template (7) and the upper ejector plate (14).