Ejector plate structure of injection mold
By innovating the design of guide pillars and guide grooves, the movement mode of the ejector plate is optimized, solving the problems of low demolding efficiency and component wear caused by frictional resistance, and achieving efficient and stable injection molding production.
Patent Information
- Application Number
- CN202520123838.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-20
- Publication Date
- 2025-12-16
- Estimated Expiration
- 2035-01-20
AI Technical Summary
The ejector plate structure of existing injection molds has high frictional resistance, resulting in low demolding efficiency, long production cycle, severe component wear, and increased maintenance costs.
The design employs guide posts and guide grooves. The ejector plate is divided into first and second ejector plates that are fixedly connected. The guide grooves have different diameters, and the guide posts have non-equal diameter axial diameters. Combined with guide rods and springs, the movement mode of the ejector plate is optimized.
It improves demolding efficiency, extends mold life, reduces maintenance costs, and enhances product quality stability and production efficiency.
Smart Images
Figure CN223671725U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to injection mold technical field, concretely relates to a ejector plate structure of injection mold. BACKGROUND
[0002] In modern manufacturing industry, injection mold plays a pivotal role, and is widely applied to the production process of various plastic products. The existing injection mold is usually composed of a male die plate and a female die plate, which are respectively fixed on the corresponding fixed plates to ensure the stability of the mold structure during the injection molding process.
[0003] Among them, the reciprocating ejector plate is specially arranged between the male die plate and the fixed plate, which is crucial for the demolding process after injection molding. When the plastic product is cooled and formed in the mold cavity, the movement of the ejector plate can push the ejector pin to smoothly eject the formed product from the mold, ensuring the continuity of the production process.
[0004] Further, two mold pins connecting the male die plate and the fixed plate are arranged on both sides of the ejector plate. From the initial design of the structure, the mold pin plays a role in supporting the male die plate and enhancing the overall rigidity of the mold, and also provides guidance for the reciprocating movement of the ejector plate.
[0005] However, in the actual production process, this traditional structure has obvious drawbacks. Since the ejector plate and the two mold pins are connected in a sliding manner, their side surfaces are in close contact, forming a large area of surface contact. During the frequent reciprocating movement of the ejector plate, a large frictional resistance occurs between the contact surfaces. This not only makes the movement of the ejector plate less smooth, reduces the demolding efficiency, prolongs the production cycle of a single product, and thus affects the overall production capacity; moreover, long-term friction can cause severe wear of the components, increasing the maintenance cost and replacement frequency of the mold, causing many inconveniences and economic burdens to the production and operation of the enterprise.
[0006] In summary, the existing structure of the ejector plate of the injection mold needs to be improved to overcome the problems caused by frictional resistance and meet the needs of modern manufacturing industry for efficient and stable production. SUMMARY
[0007] In view of the problems pointed out in the background art, the utility model provides an ejector plate structure of an injection mold to solve the above technical problems.
[0008] The technical solution of the utility model is as follows:
[0009] A pin plate structure of an injection mold, comprising a male mold plate, a fixed plate, mold feet, and a pin plate, the male mold plate is fixedly connected with the fixed plate through two mold feet, the pin plate is located in an area surrounded by the male mold plate, the fixed plate, and the two mold feet, and the pin plate can reciprocate between the male mold plate and the fixed plate,
[0010] The two sides of the pin plate are respectively spaced apart from the two mold feet.
[0011] The two sides of the pin plate are respectively provided with guide columns arranged along the moving direction of the pin plate.
[0012] The opposite surfaces of the pin plate and the mold feet are respectively provided with guide grooves connected with the guide columns.
[0013] The pin plate comprises a first pin plate and a second pin plate fixedly connected, the diameter of the guide groove on the first pin plate is greater than the diameter of the guide groove on the second pin plate, and the diameter of the guide groove on the second pin plate is equal to the diameter of the guide column.
[0014] The diameter of the guide column near the male mold plate is greater than the diameter of the other end.
[0015] The guide column is fixedly arranged in the moving direction of the pin plate, and the male mold plate is provided with a connecting hole connected with the guide column.
[0016] The two sides of the pin plate are respectively provided with two guide columns.
[0017] The pin plate is fixedly connected with a guide rod, the male mold plate is provided with a guide hole connected with the guide rod, the guide rod is sleeved with a spring, and the two ends of the spring are respectively abutted with the male mold plate and the pin plate.
[0018] The pin plate is connected with a pin.
[0019] The fixed plate is provided with a through hole penetrating through the two sides thereof, and the through hole is correspondingly arranged with the center of the pin plate.
[0020] By adopting the above technical scheme, the pin plate structure of the injection mold has the following beneficial effects:
[0021] First, the demolding efficiency is greatly improved. By innovatively designing the ejector plate to include a first ejector plate and a second ejector plate fixedly connected, and reasonably planning the diameter relationship between the guide grooves and guide columns of the two, the contact area actually sliding with the guide column is minimized. In the demolding process after injection molding, the ejector plate can move back and forth between the male mold plate and the fixed plate in a more light and smooth state, greatly speeding up the speed of the ejector pin pushing the product out of the mold cavity, shortening the demolding time of a single product, so that more products can be injection molded in unit time, significantly improving the overall production efficiency.
[0022] Second, the service life of the mold is prolonged. Due to the effective reduction of friction resistance, the wear and tear of the ejector plate, guide column and mold foot and other components during long-term frequent reciprocating motion is greatly reduced. The problem of premature aging, deformation and even damage of components caused by friction in the past is effectively alleviated, the frequency of mold maintenance and replacement of parts is reduced, the equipment maintenance cost of the enterprise is reduced, and the mold can be stably and reliably operated for a long time, providing a strong guarantee for the continuous production of the enterprise.
[0023] Third, from the product quality stability, the smooth demolding process avoids the appearance defects such as scratches and deformation that may be caused by the moving jam of the ejector plate, so that the yield of injection molded products is improved, which helps the enterprise to improve market competitiveness and create more economic benefits. In short, the patent injects new vitality into the development of the injection mold industry. BRIEF DESCRIPTION OF DRAWINGS
[0024] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiment or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.
[0025] Figure 1 It is a structure diagram of the mold foot exploded by the present application.
[0026] Figure 2 It is a structure diagram of the fixed plate exploded by the present application.
[0027] Figure 3 It is a structure diagram of the mold foot exploded by the present application Figure 2 .
[0028] Figure 4 It is a structure diagram of the fixed plate hidden by the present application.
[0029] Figure 5The utility model discloses a structure diagram of guide column.
[0030] Figure 6 The utility model discloses Figure 4 A part of the enlarged view in the utility model.
[0031] The label explanation in the drawing: public template 1, fixed plate 2, die foot 3, first thimble plate 41, second thimble plate 42, guide column 5, guide slot 6, connecting hole 7, guide rod 8, guide hole 9, spring 10, thimble 11, through -hole 12. Specific implementation
[0032] The technical scheme in the utility model embodiment will be clearly and completely described below with the drawings in the utility model embodiment, and apparently, the described embodiment is only a part of the embodiment of the utility model, not all the embodiment. Based on the embodiment in the utility model, all other embodiments obtained by the ordinary skill in the art without making the creative labor belong to the range of the utility model protection.
[0033] The following reference Figures 1-6 The utility model is explained:
[0034] Embodiment: in the field of injection mold, the fine design of the internal structure of the mold is directly related to production efficiency, product quality and the service life of the mold. The injection mold thimble plate structure involved this time covers the key components such as public template 1, fixed plate 2, die foot 3, thimble plate, and the components cooperate with each other, and jointly complete the demolding process after injection molding.
[0035] Public template 1 is the important support of the mold forming part, and is stably fixedly connected through two die feet 3 and fixed plate 2. This connecting mode constructs a relatively stable frame structure, which provides basic guarantee for the operation of the subsequent thimble plate. The thimble plate is accurately placed in the specific area surrounded by public template 1, fixed plate 2 and two die feet 3, and has the ability of reciprocating between public template 1 and fixed plate 2. This reciprocating movement characteristic is the core action drive of realizing the demolding of injection molded product, when the injection molding process ends, the product is cooled and shaped, and the timely movement of the thimble plate can drive the thimble to smoothly push the product out of the mold cavity.
[0036] Especially crucially, the two sides of the thimble plate are different from the traditional design, not directly contacting with the die foot 3, but intentionally spaced. On this basis, guide columns 5 are additionally arranged on the two sides of the thimble plate, and the axial direction of the guide columns 5 is strictly along the moving direction of the thimble plate. At the same time, on the opposite faces of the thimble plate and the die foot 3, the guide slots 6 closely connected with the guide columns 5 are carefully designed and processed.
[0037] The above innovative design scheme brings significant advantages. In the past, in the traditional injection mold structure, the large-area direct contact between the ejector plate and the mold foot inevitably generates a large frictional resistance during the frequent reciprocating sliding of the ejector plate. This not only slows down the demolding speed, leading to an extension of the production cycle, but also causes part wear due to friction, requiring frequent maintenance of the mold and increasing production costs. In the new scheme, the contact mode between the ejector plate and the mold foot 3 is changed by introducing the guide column 5, which is significantly smaller in area than the overall side surface of the ejector plate. In this way, the friction generated by the contact between the ejector plate and the guide column 5 is correspondingly greatly reduced during the reciprocating movement of the ejector plate. Smaller frictional resistance makes the movement of the ejector plate more light and smooth, and the demolding operation can be more efficient and fast, greatly improving the overall efficiency of injection molding production. At the same time, due to the reduction of frictional wear, the service life of the mold parts is extended, reducing the maintenance frequency and cost, and creating favorable conditions for the sustainable and stable production of enterprises.
[0038] The ejector plate is not a single integral component, but is composed of a first ejector plate 1 and a second ejector plate 2 connected together. The guide groove 6 on the first ejector plate 1 is specially designed with a larger diameter, while the guide groove 6 on the second ejector plate 2 is obviously smaller in diameter and precisely equal to the diameter of the guide column 5.
[0039] From the actual operating principle, during the reciprocating movement of the ejector plate to drive the demolding action, since the diameter of the guide groove 6 on the second ejector plate 2 matches the diameter of the guide column 5, the guide column 5 only forms a sliding contact relationship with the second ejector plate 2, while the first ejector plate 1 does not directly generate sliding friction with the guide column 5 due to the larger diameter of the guide groove 6. In this way, compared with the traditional design or the previous improvement scheme of simply setting the guide column, the area of actual sliding contact is further reduced.
[0040] The advantage of reducing the contact area is fully demonstrated in the long-term and high-frequency use of the injection mold. Smaller contact area means that the resistance generated by friction during each reciprocating movement of the ejector plate is minimal. This not only makes the movement of the ejector plate more agile and smooth, greatly improving the execution speed of the demolding process, thereby increasing the output per unit time of injection molding production and effectively improving production efficiency; moreover, since the frictional wear is controlled at a very low level, the wear rate of the related parts inside the mold is significantly reduced, the maintenance cycle is extended, and the human, material and financial resources invested by the enterprise in mold repair and replacement of parts are reduced, laying a solid foundation for the long-term, stable and efficient production and operation of the enterprise.
[0041] The guide column 5 presents a non-equal-diameter delicate structure in the axial dimension, which is designed to have a larger diameter at one end close to the male mold plate 1 than at the other end. This differentiated design is not arbitrary, but closely matches the actual working condition requirements of the injection mold during the entire demolding and resetting process, and involves double considerations of the stability and efficiency of the mold operation.
[0042] When the injection process advances to the demolding stage, the ejector plate is driven to move towards the male mold plate 1, which undertakes the important task of precisely and smoothly ejecting the molded plastic product from the mold cavity. At this time, the larger-diameter end of the guide column 5 begins to play a key role. Because of its larger diameter, it can provide a wider support surface when in contact with the ejector plate, providing stronger stability protection for the ejector plate during demolding. From the perspective of mechanics, a larger contact area can more evenly distribute the thrust and lateral forces that the ejector plate may experience due to movement, effectively preventing the ejector plate from shaking or shifting during demolding, ensuring that the demolding action is precisely executed along the predetermined trajectory, and minimizing the adverse effects of abnormal demolding on product quality.
[0043] Once the demolding operation is successfully completed, the ejector plate immediately enters the resetting process and moves away from the male mold plate 1. At this time, as the ejector plate gradually moves away, it will gradually approach the smaller-diameter end of the guide column 5. Cleverly, during this resetting stage, the ejector plate does not require the same high-strength stability support as during demolding. Because there is no demolding resistance to overcome at this time, the ejector plate only needs to be reset smoothly. Thanks to the gradual change in diameter of the guide column 5, when the ejector plate moves to the position corresponding to the smaller-diameter end, the two are no longer in contact, completely eliminating the frictional resistance that may occur during this stage. This not only makes the resetting action of the ejector plate more light and smooth, reducing unnecessary energy loss, but also, from a long-term operation perspective, greatly reduces the wear and tear on the guide column 5 and the ejector plate caused by frequent friction, further extending the service life of the key components of the mold and reducing the frequency of maintenance, providing a solid guarantee for the continuous and efficient operation of injection molding production.
[0044] In summary, the non-equal-diameter innovative design of the guide column 5, by precisely matching the needs of the ejector plate at different stages of demolding and resetting, achieves a perfect balance between stability and low frictional resistance, opening up a new path for the optimization and upgrading of injection molds.
[0045] In the direction of the movement of the ejector plate, the guide column 5 is fixedly arranged, and the public mold plate 1 is accurately machined at the corresponding position to form a connecting hole 7, and the guide column 5 is stably embedded in the connecting hole 7. The fixed arrangement provides a very reliable guide reference for the reciprocating movement of the ejector plate. On the one hand, the position of the guide column 5 is constant, so that the ejector plate can always travel along the preset accurate path during frequent back and forth movement, effectively avoiding problems such as jamming and misalignment caused by guide deviation, and ensuring the continuity and stability of the demolding process. On the other hand, compared with the movable guide part, the fixed guide column 5 has a simple structure and is convenient to install and debug, thereby reducing the complexity and time cost of mold assembly.
[0046] Two guide columns 5 are arranged on both sides of the ejector plate, forming a double-sided double-column guide structure. This design greatly enhances the stability of the ejector plate during movement. Multiple guide columns 5 cooperatively constrain the movement trajectory of the ejector plate from different directions, so that the ejector plate can still maintain a smooth sliding state under the condition of bearing a large demolding thrust or uneven stress caused by mold machining precision and other factors, further improving the reliability of the mold operation and reducing the friction of parts and product forming defects that may be caused by shaking and tilting.
[0047] The ejector plate is firmly connected with a guide rod 8, the public mold plate 1 is correspondingly provided with a guide hole 9 matched with the guide rod 8, and the guide rod 8 is sleeved with a spring 10. The two ends of the spring 10 are tightly abutted against the public mold plate 1 and the ejector plate. In the initial stage of injection molding, the spring 10 is in a compressed state and stores a certain elastic potential energy. When the demolding process starts, the ejector rod passes through the through hole 12 penetrating through both sides of the fixed plate 2 and accurately corresponding to the center of the ejector plate, and pushes the ejector plate to move. The energy stored in the spring 10 is gradually released to assist the ejector plate to return smoothly, ensuring that the ejector rod 11 can quickly and orderly return to the initial state after completing the product ejection action, preparing for the next round of injection molding production, and buffering the impact force in the movement process of the ejector plate, protecting the mold parts from hard impact damage.
[0048] The connection between the ejector rod 11 and the ejector plate is the direct execution link for product demolding. The ejector rod 11 is reasonably distributed on the ejector plate according to the structure characteristics of the mold cavity and the product. When the ejector plate accurately moves under the cooperation of the guide column 5, the guide rod 8 and the spring 10, the ejector rod 11 accurately exerts force to smoothly and completely eject the molded product from the mold cavity, complete the entire demolding process, and ensure the efficiency of injection molding and the reliability of product quality. These fine designs cooperate with each other to comprehensively improve the performance of the injection mold.
[0049] The above only describes the preferred embodiment of the utility model, and does not limit the utility model. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the utility model should be included in the protection scope of the utility model.
Claims
1. A ejector plate structure of injection mold, comprising a male mold plate (1), a fixed plate (2), a mold foot (3), an ejector plate, the male mold plate (1) is fixedly connected with the fixed plate (2) through two mold feet (3), the ejector plate is located in the area surrounded by the male mold plate (1), the fixed plate (2) and the two mold feet (3), and the ejector plate can reciprocate between the male mold plate (1) and the fixed plate (2), characterized in that: the two sides of the ejector plate are spaced apart from the two mold feet (3) respectively; the two sides of the ejector plate are respectively provided with guide columns (5), and the guide columns (5) are arranged along the moving direction of the ejector plate; the opposite surfaces of the ejector plate and the mold foot (3) are respectively provided with guide grooves (6) connected with the guide columns (5). The ejector plate comprises a first ejector plate (41) and a second ejector plate (42) fixedly connected, the diameter of the guide groove (6) on the first ejector plate (41) is greater than that of the guide groove (6) on the second ejector plate (42), and the diameter of the guide groove (6) on the second ejector plate (42) is equal to that of the guide column (5). The diameter of the guide column (5) near the male mold plate (1) is greater than that of the other end. In the moving direction of the ejector plate, the guide column (5) is fixedly arranged, and the male mold plate (1) is provided with a connecting hole (7) connected with the guide column (5).
2. The ejector plate structure of an injection mold according to claim 1, wherein: The two sides of the ejector plate are respectively provided with two guide columns (5).
3. The ejector plate structure of an injection mold according to claim 2, wherein: The ejector plate is fixedly connected with a guide rod (8), the male mold plate (1) is provided with a guide hole (9) connected with the guide rod (8), the guide rod (8) is sleeved with a spring (10), and the two ends of the spring (10) are respectively abutted against the male mold plate (1) and the ejector plate.
4. The ejector plate structure of an injection mold according to claim 3, wherein: The ejector plate is connected with an ejector pin (11).
5. The ejector plate structure of claim 3 wherein: The fixed plate (2) is provided with a through hole (12) penetrating through the two sides thereof, and the through hole (12) is arranged in correspondence with the center of the ejector plate.
6. The ejector plate structure of claim 3 wherein: 7. The ejector plate structure of claim 3 wherein: 8. The ejector plate structure of claim 3 wherein: