An injection mold

Abstract

The application discloses an injection mold, comprising a front mold plate provided with a front mold core; a rear mold plate provided with a rear mold core; a molding cavity on the front mold core and the rear mold core which jointly enclose a mold cavity; a flow channel assembly arranged on the front mold plate, and a material injection port of the flow channel assembly being in communication with the molding cavity on the front mold core; a demolding plate movably arranged on a side of the front mold plate away from the front mold core, the demolding plate having a non-moving state and a movable state, in the non-moving state, when the front mold plate drives the front mold core to open or close, the injection mold, the upper inclined ejector and the lower inclined ejector work cooperatively, and the mechanical driving and the limiting of the demolding spring and the distance limiting column are matched, so that the upper inclined ejector can automatically adhere to the product during opening, the extension amount can be accurately controlled, and the problems of displacement, deformation and sticking during demolding of a large-volume complex shell are effectively avoided by combining the lateral core-pulling and the vertical ejection actions, and the demolding continuity and the product size stability are ensured.

Description

Technical Field

[0001] This application relates to the field of mold technology, and more particularly to an injection mold. Background Technology

[0002] Injection molding technology, due to its high production efficiency and molding precision, has been widely used in the production of plastic products in fields such as home appliances, automobiles, and electronics. As the core equipment of this technology, the rationality of the design and the stability of the performance of the injection mold directly determine the quality, production efficiency, and manufacturing cost of the plastic products. With the continuous upgrading of market demand, there is an increasing number of large-volume and structurally complex plastic products such as robot vacuum cleaner shells and automotive interior parts. These products not only have complex shapes and require matching the assembly precision of multiple parts, but also have a significantly increased contact area with the mold core, which brings greater challenges to the demolding process of injection molds.

[0003] Currently, most existing injection molds for demolding such large and complex plastic products adopt a single ejector pin or a traditional single-sided inclined ejector core pulling structure. Among them, the single ejector pin ejection method can only achieve localized ejection under force. Due to the large covering force of the molding cavity and uneven demolding resistance during demolding of such products, it is easy to cause uneven stress on the product, which in turn leads to defects such as displacement, deformation, whitening, and sticking to the mold. Moreover, the single ejector pin structure cannot achieve lateral core pulling and is difficult to adapt to products with undercuts and complex grooves. The traditional single-sided inclined ejector structure can only achieve core pulling and ejection from one side of the product. The single-sided inclined ejector structure means that core pulling and ejection can only be achieved on one side of the product (as shown on the lower surface). It cannot provide comprehensive and stable support for the product. When such large-volume and complex plastic products are demolded, the temperature has not completely dropped to room temperature, and the material still has a certain degree of thermoplasticity. The rigidity of its own structure is insufficient. During the demolding process, it will be subjected to uneven forces such as the adsorption force of the mold core and local demolding resistance. Without comprehensive and stable support, the stress on various parts of the product is unbalanced, and weak parts are easily pulled or squeezed, which can cause product warping, local depressions and other deformations. Summary of the Invention

[0004] The purpose of this application is to propose an injection mold to solve the problems of existing injection molds when demolding large-volume, complex plastic products such as robot vacuum cleaner shells and automotive interior parts. These problems include uneven force distribution caused by a single ejector pin, easy displacement and deformation, inability to pull the core laterally, and the inability of traditional single-sided inclined ejectors to fully and stably support the product. Due to insufficient thermoplasticity and rigidity of the product and the imbalance of force, it is easy to cause deformation such as warping and local depressions.

[0005] To achieve this objective, the following technical solution is adopted in this application: An injection mold, comprising: The front template has a front mold core. The rear template is equipped with a rear mold core. The molding cavities on the front mold core and the rear mold core together enclose and form a mold cavity; A runner assembly is disposed on the front mold plate, and the injection port of the runner assembly is connected to the molding cavity on the front mold core; The ejector platen is movably disposed on the side of the front template opposite to the front mold core. The ejector platen has a stationary state and a movable state. In the stationary state, when the front template drives the front mold core to open or close the mold, the ejector platen does not move with the front template and remains stationary relative to the rear template. In the movable state, the ejector platen moves with the front template. An ejector plate is movably disposed on the side of the rear mold plate opposite to the rear mold core, and the ejector plate can move along the mold opening and closing directions; The upper inclined top is installed at one end on the stripping template and slides through the front mold core at the other end, and part of the outer wall of the upper inclined top forms part of the inner wall of the forming cavity of the front mold core; The downward-sloping ejector is mounted on the ejector plate at one end and slides through the rear mold core at the other end. A portion of the outer wall of the downward-sloping ejector forms part of the inner wall of the molding cavity of the rear mold core.

[0006] Optionally, the runner assembly is a hot runner assembly, which includes a manifold, a hot nozzle, a heating element, and a main runner nozzle. The manifold is disposed on the side of the front mold plate away from the front mold core. The heating element is disposed on the manifold. The hot nozzle is disposed on the manifold and also communicates with the runner in the manifold. The hot nozzle has the injection port, and one end of the hot nozzle with the injection port penetrates the front mold plate and the front mold core and communicates with the molding cavity of the front mold core. The main runner nozzle is disposed on the manifold and communicates with the runner in the manifold.

[0007] Optionally, the front template has an assembly groove on the side away from the front mold core, and the ejector plate is slidably disposed in the assembly groove; a runner plate is also installed on the side of the front template away from the front mold core, and the flow divider plate is embedded in the runner plate; an upper return shaft is installed between the runner plate and the inner wall of the assembly groove, and the upper return shaft also slides through the ejector plate, and the axial direction of the upper return shaft is consistent with the mold opening and mold closing directions.

[0008] Optionally, a demolding spring is installed between the demolding template and the runner plate; a limiting post is installed on the demolding template, and the end of the limiting post away from the demolding template slides through the front template; the end of the limiting post away from the demolding template is used to abut against the rear template, so that the end of the upper inclined ejector away from the demolding template and the rear mold core maintain a gap.

[0009] Optionally, the ejector plate is provided with a plurality of balancing ejector pins, which are slidably inserted through the rear mold core; the plurality of balancing ejector pins are distributed at a central interval around the ejector plate and are all disposed opposite to the edge of the molding cavity of the rear mold core.

[0010] Optionally, the ejector plate is provided with a plurality of central ejector pins at intervals, the central ejector pins slidably penetrating the rear mold core, and the plurality of central ejector pins are arranged opposite to the central region of the molding cavity of the rear mold core.

[0011] Optionally, the inner wall of the mold cavity of the rear mold core is provided with a molding groove, which is used to form thin sheet protrusions on the surface of the product. The ejector plate is provided with an anti-breakage ejector pin, which can slide through the rear mold core and is located on the side of the molding groove.

[0012] Optionally, a square iron part is provided on the side of the rear template away from the rear mold core, and a lower sealing plate is provided on the side of the square iron part away from the rear template; a lower return post penetrating the ejector plate is installed between the lower sealing plate and the rear template; and a return spring is installed between the rear template and the ejector plate.

[0013] Optionally, the molding cavity of the rear mold core has a recessed groove, and the front mold core has a mating portion that is adapted to the recessed groove; the ejector plate is equipped with an ejector-assisting angled ejector, which slidably penetrates the mating portion of the front mold core, and a portion of the outer wall of the ejector-assisting angled ejector constitutes a portion of the sidewall of the mating portion; the ejector plate is equipped with a pusher angled ejector and a pusher ejector pin, which slidably penetrates the rear mold core and extends into the recessed groove, and a portion of the outer wall of the pusher angled ejector constitutes a portion of the sidewall of the recessed groove; the ejector-assisting angled ejector and the pusher angled ejector are arranged opposite to each other; the pusher ejector pin slidably penetrates the rear mold core, and the pusher ejector pin corresponds to the recessed groove.

[0014] Optionally, the bottom wall of the recessed groove is provided with a boosting groove, and a boosting part is installed on the boosting inclined top. The boosting part extends into the boosting groove, and part of the outer wall of the boosting part constitutes part of the bottom wall of the recessed groove.

[0015] Compared to existing technologies, the beneficial effects of this application are: 1. The structure of upper and lower inclined ejectors is adopted. With the mechanical drive and limit of the demolding spring and the distance column, it can realize that the upper inclined ejector automatically fits the product when the mold is opened, and can control its extension. At the same time, combined with the side core pulling and vertical ejection action, it can effectively avoid the problems of displacement, deformation and sticking to the mold when demolding large and complex shells, and ensure the demolding continuity and product size stability.

[0016] 2. The runner assembly adopts a multi-point hot runner structure. Through the cooperation of the manifold, heating element and multiple hot nozzles, the melt is kept warm and free of solidification throughout the process, shortening the melt flow and achieving balanced filling. This reduces molding defects such as weld lines and shrinkage cavities, saving raw material costs while improving product molding quality.

[0017] 3. A surrounding distribution of balance ejector pins, a central ejector pin, and auxiliary ejector pins, push ejector pins, and push ejector pins for recessed areas are set up to form a comprehensive multi-point coordinated ejection system. This effectively disperses the ejection force, further preventing product edge warping, central depression, and tearing of recessed areas. At the same time, the anti-breakage ejector pins can protect the thin sheet protrusion structure and improve product yield. Attached Figure Description

[0018] The accompanying drawings further illustrate this application, but the content of the drawings does not constitute any limitation on this application.

[0019] Figure 1 This is a schematic diagram of the overall structure of this injection mold; Figure 2 This is an injection mold Figure 1 Sectional view along the AA direction; Figure 3 This is an injection mold Figure 1 Sectional view in the BB direction; Figure 4 This is a schematic diagram of an injection mold used to demonstrate how a product is ejected from the mold cavity by an upper and lower inclined ejector. Figure 5 This is an injection mold Figure 1 Sectional view in the CC direction; Figure 6 This is a structural diagram of an injection mold used to demonstrate how the product is ejected from the mold cavity by anti-breakage ejector pins, balance ejector pins, center ejector pins, and booster ejector pins; Figure 7 This is an injection mold Figure 1 Sectional view in the DD direction; Figure 8 This is a structural diagram of an injection mold used to demonstrate how a product is ejected from the mold cavity by ejector lifters and push lifters. The product moves along... Figure 4 Cut along the FF direction.

[0020] In the attached diagram: 1. Front mold plate; 101. Front mold core; 1011. Mating part; 102. Assembly slot; 103. Runner plate; 2. Rear mold plate; 201. Rear mold core; 2011. Recessed groove; 3. Mold cavity; 4. Hot runner assembly; 41. Manifold; 42. Hot nozzle; 43. Heating element; 44. Main runner nozzle; 5. Release plate; 51. Spacer pin; 52. Assisted ejector pin; 6. Ejector plate; 61. Balance ejector pin; 62. Center ejector pin; 63. Assisted ejector pin; 64. Assisted ejector pin; 7. Upper angled ejector; 8. Lower angled ejector; 9. Upper return shaft; 10. Demolding spring; 11. Assisted groove; 12. Assisted part; 14. Anti-breakage ejector pin; 15. Square iron part; 16. Lower sealing plate; 17. Lower return pin; 18. Return spring; 19. Upper sealing plate; 300. Product. Detailed Implementation

[0021] The embodiments of this application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," etc., indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this application. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, and "several" means one or more, unless otherwise expressly and specifically defined.

[0022] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0023] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0024] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0025] In this embodiment, by Figures 1-8 An injection mold is provided, comprising a front mold plate 1, a rear mold plate 2, a runner assembly, a stripper plate 5, an ejector plate 6, an upper inclined ejector 7, and a lower inclined ejector 8.

[0026] Among them, reference Figure 2 A front mold core 101 is fixed on the front mold plate 1, and a rear mold core 201 is fixed on the rear mold plate 2. When the two are closed, the molding cavities on the front mold core 101 and the rear mold core 201 together enclose the mold cavity 3 of the product 300. The mold cavity 3 is a cavity in the mold used to mold plastic products. It is the space where molten plastic is injected, cooled and solidified to form the product 300.

[0027] Since the process involves injecting molten plastic into the mold cavity 3, the mold also involves a runner assembly for pouring. Specifically, the runner assembly is located on the front mold plate 1 and its injection port is connected to the molding cavity of the front mold core 101 to inject molten plastic. The runner assembly is a channel component in the mold that transports molten plastic. Its function is to smoothly and evenly introduce the molten plastic into the mold cavity 3, ensuring smooth filling, stable product quality, and avoiding defects such as material shortage, shrinkage marks, and bubbles.

[0028] Injection molds are specialized molds used for injection molding. Molten plastic is poured into the mold cavity 3, and after cooling, a plastic product 300 is obtained. They can mass-produce complex-shaped plastic products, such as robot vacuum cleaner shells, mobile phone shells, remote controls, plastic basins, toys, automotive interior parts, bottle caps, toothbrushes, and storage boxes. Some plastic products have complex structures and large volumes. For example, the robot vacuum cleaner shell is complex because it must accommodate curved surfaces, internal structural limits, sensor mounting positions, air inlet and outlet ducts, clip and screw fixing positions, dustproof and waterproof structures, and match the precision of components such as rollers, side brushes, and dustbins. The combination of shape and function results in a complex structure and a large volume.

[0029] For products 300 with complex structures and large volumes, such as the outer shell of a robotic vacuum cleaner, the contact area with the mold core is relatively large during demolding. Furthermore, these large and complex plastic products are not yet fully cooled to room temperature immediately after demolding, and the material still retains some thermoplasticity and insufficient structural rigidity. During demolding, they are subjected to uneven forces such as the suction force of the mold core and local demolding resistance. Without comprehensive and stable support, the forces on different parts of the product 300 become unbalanced, and weaker parts are easily stretched or squeezed, leading to deformations such as warping and localized dents. During ejection, the product is also prone to displacement, making the demolding process less fluid. Based on this, the following optimized design is proposed: (Specifically, refer to...) Figures 2-4 The ejector plate 5 is movably installed on the side of the front platen 1 away from the front mold core 101. The ejector plate 5 has a stationary state and a movable state. In the stationary state, when the front platen 1 drives the front mold core 101 to open or close the mold, the ejector plate 5 does not move with the front platen 1 and remains stationary relative to the rear platen 2. In the movable state, the ejector plate 5 moves with the front platen 1, and the ejector plate 6 is movably set on the side of the rear platen 2 away from the rear mold core 201. Movable means that the ejector plate 6 moves along the direction of approaching or moving away from the rear mold core 201. Furthermore, one end of the upper inclined ejector 7 is installed on the ejector plate 5, and the other end of the upper inclined ejector 7 slides through the front mold core 101, so that part of the outer wall of the upper inclined ejector 7 constitutes part of the inner wall of the molding cavity of the front mold core 101. In other words, part of the upper inclined ejector 7 and the front mold core 101 together constitute a complete molding cavity wall. Similarly, one end of the lower inclined ejector 8 is installed on the ejector plate 6, and the other end of the lower inclined ejector 8 also slides through the rear mold core 201, so that part of the outer wall of the lower inclined ejector 8 constitutes part of the inner wall of the molding cavity of the rear mold core 201.

[0030] The rear template 2 is fixed, while the front template 1 is a movable part. For ease of understanding, the mold opening direction, which is the direction in which the front template 1 moves away from the rear template 2, is defined as upward; the mold closing direction, which is the direction in which the front template 1 moves towards the rear template 2, is defined as downward; and the direction perpendicular to the mold opening or closing direction is defined as horizontal. The working process of this mold consists of the following four stages: In the first stage, the front template 1 moves upward (in the mold opening direction), and the front mold core 101 on the front template 1 moves accordingly. However, since the side of the front template 1 opposite to the front mold core 101 has a receiving cavity that can accommodate and allow the moving ejector plate 5, and the moving direction of the ejector plate 5 (moving downward) is opposite to the mold opening direction (moving upward), the ejector plate 5 can move within the receiving cavity in the front template 1. The power structure for moving the ejector plate 5 can be an elastic structure or a drive source. This power structure is mounted on the front template 1 and also moves with the front template 1. This power structure allows the front mold plate 1 and the front mold core 101 to move upward (moving in the mold opening direction), driving the ejector plate 5 to move downward (in the mold closing direction) relative to the bottom wall of the receiving cavity. However, the ejector plate 5 remains stationary relative to the rear mold plate 2. This means that the upward movement of the ejector plate 5 caused by the front mold plate 1 through the power structure is offset by the downward movement of the ejector plate 5 caused by the power structure. As a result, the ejector plate 5 is not driven by the front mold plate 1 for a period of time. During this period, the state in which the ejector plate 5 is not driven by the front mold plate 1 is defined as the state of no movement. The upper inclined ejector 7 is installed on the ejector plate 5. The front plate 1 and the front mold core 101 are both provided with an upper inclined opening for the upper inclined ejector 7 to guide and extend. This upper inclined opening is connected to the molding cavity of the front mold core 101. The upper inclined ejector 7 slides through the upper inclined opening and passes through the front plate 1 and the front mold core 101 in sequence. Furthermore, a part of the upper inclined ejector 7 and the front mold core 101 together form a complete molding cavity wall. Therefore, when the ejector plate 5 is in a stationary state, the ejector plate 5 and the upper inclined ejector 7 are stationary in the mold opening direction. This means that the position is stationary relative to the rear plate 2 and the product 300. During the mold opening process, as the front mold plate 1 and the front mold core 101 move upward, the ejector plate 5 and the upper inclined ejector 7 remain stationary. The end of the upper inclined ejector 7 away from the ejector plate 5 continuously extends out of the molding cavity of the front mold core 101, and the end of the upper inclined ejector 7 away from the ejector plate 5 always abuts against the upper surface of the product 300. Since the upper inclined ejector 7 is inclined, it is set at an angle. Therefore, when the front mold plate 1 and the front mold core 101 move in the mold opening direction, the upper inclined ejector 7 will also move horizontally to disengage from the undercut structure on the product 300. At the same time, it will also push the product 300 out of the molding cavity of the front mold core 101. The upper surface of the product 300 is separated from the molding cavity of the front mold core 101. However, at this time, the lower surface of the product 300 has not yet separated from the molding cavity of the rear mold core 201. After the above process, the product 300 can be completely separated from the front mold core 101.Subsequently, the front template 1 continues to move upward (in the mold opening direction), and the power structure also continues to drive the ejector plate 5 to move downward (in the mold closing direction) in the receiving cavity relative to the bottom wall of the receiving cavity, until the ejector plate 5 abuts against the bottom wall of the receiving cavity on the front template 1. At this time, the state in which the ejector plate 5 abuts against the bottom wall of the receiving cavity is defined as the movable state. In the movable state, the front template 1 can drive the ejector plate 5 and the upper inclined ejector 7 to move upward. In principle, the upper inclined ejector 7 can be moved away from the rear template 2 and the product 300. However, this is only possible if the product 300 is not pushed upward by the lower inclined ejector 8 and is still in the movable state. The product 300 is on the rear mold core 201, while the rear template 2 and the rear mold core 201 are fixed. When the front template 1 moves upward, it can drive the upper inclined ejector 7 away from the product 300, so that the end of the upper inclined ejector 7 away from the ejector plate 5 does not abut against the upper surface of the product 300.

[0031] The second stage follows immediately after the first stage, and product 300 is pushed upwards by the downward-sloping ejector 8. The upward-sloping ejector 7 and the downward-sloping ejector 8 continuously press against product 300. Specifically: Since the rear mold plate 2 and the rear mold core 201 share a downward-sloping opening for guiding and extending the downward-sloping ejector 8, this opening communicates with the molding cavity of the rear mold core 201. The downward-sloping ejector 8 slides through the downward-sloping opening into the rear mold plate 2 and the rear mold core 201. Furthermore, a portion of the downward-sloping ejector 8 and the rear mold core 201 together form a complete molding cavity wall. The downward-sloping ejector 8 can move upwards as the product is pushed... When the ejector plate 6 moves upward, it extends out of the molding cavity of the rear mold core 201 through the lower inclined opening. Therefore, when the ejector plate 5 is in a movable state and the end of the upper inclined ejector 7 away from the ejector plate 5 abuts against the upper surface of the product 300, the ejector roller on the injection molding machine pushes the ejector plate 6 upward to eject the product 300 from the molding cavity of the rear mold core 201. Since the lower inclined ejector 8 is also inclined as an inclined ejector, the lower inclined ejector 8, like the upper inclined ejector 7, will produce a horizontal movement to disengage from the undercut structure on the product 300, thereby achieving lateral core pulling and preventing the product 300 from being stuck during ejection. More importantly, during the process of the lower inclined ejector 8 pushing the product 300 out of the molding cavity of the rear mold core 201, the product 300 will move upward. However, as the product 300 moves upward, the front mold plate 1 also synchronously drives the ejector plate 5 and the upper inclined ejector 7 to move upward. During this process, the moving direction and moving speed of the front mold plate 1 and the ejector plate 6 are consistent. This means that after the first stage is completed, the upward moving distance of the upper inclined ejector 7 driven by the front mold plate 1 is always equal to the upward moving distance of the lower inclined ejector 8 driven by the ejector plate 6, and it is dynamically adjusted. This makes the upper inclined ejector 7 and the lower inclined ejector 8 always abut against the upper and lower surfaces of the product 300. This continuous contact is equivalent to providing dynamic support on the upper and lower sides of the product 300. Because large-volume shell products 300 often experience warping, deformation, or tearing during demolding due to the large suction force of the molding cavity and uneven demolding resistance, this solution uses the simultaneous support of the upper inclined ejector 7 and the lower inclined ejector 8. This is equivalent to applying a pair of upper and lower supporting forces to the product 300 during the ejection process, thereby providing stable support for the product 300 during demolding and guiding it to smoothly detach from the mold core. This effectively avoids displacement, local depression, or adhesion to the mold surface that may occur during ejection due to the large contact area between the product 300 and the mold and the high demolding resistance, ensuring the continuity of the demolding action and the dimensional stability of the product 300.

[0032] In the third stage, after the product 300 is completely separated from the molding cavity of the rear mold core 201, the ejector plate 6 has reached the end of its stroke and no longer moves upward. This also causes the product 300 to stop moving upward. Meanwhile, the front mold plate 1 continues to drive the ejector plate 5 and the upper inclined ejector 7 to move upward, so that the upper inclined ejector 7 moves away from the rear mold plate 2 and the product 300. Only then does the upper inclined ejector 7 release its contact with the product 300, so that the product 300 can be removed.

[0033] It should be noted that the first to third stages all belong to the mold opening process.

[0034] The fourth stage is the mold closing process. After product 300 is removed from the mold, the front mold plate 1 moves downward (in the mold closing direction) to complete the mold closing operation. During this process, the ejector rollers on the power structure and the injection molding machine will drive the ejector plate 5 and ejector plate 6 to reset respectively. The upper inclined ejector 7 and lower inclined ejector 8 will reset in the opposite direction with the ejector plate 5 and ejector plate 6 (opposite to the horizontal movement direction of the first and second stages), so that the upper inclined ejector 7 and lower inclined ejector 8 return to their initial positions and re-fit with the corresponding molding cavity to form a complete molding cavity. This does not affect the mold closing of the front mold plate 1, the front mold core 101 and the rear mold plate 2, the rear mold core 201, in preparation for the next injection molding.

[0035] Based on the four stages of the above mold process, it can be concluded that by having two inclined ejectors always in contact with the surface of the product 300, the problem of difficult demolding caused by the large covering force and complex structure of the molding cavity for large-volume shells is effectively solved, thus improving demolding quality and product yield. At the same time, the mold has a compact structure and reliable operation, and has good practicality and promotion value.

[0036] It should be noted that the advantage of using an angled ejector instead of a vertical ejector pin in the direction that always contacts the upper and lower sides of the product 300 is that the product 300 is a large and complex shell, which often requires lateral core pulling to demold smoothly. Moreover, simple ejector pins can only eject at local points, which can easily lead to uneven force, deformation, whitening, or sticking to the mold. Compared with ejector pins, angled ejectors have a larger contact area with the product 300. Using angled ejectors can simultaneously achieve lateral core pulling and large-area support, taking into account both core pulling function and stable ejection. It can also simplify the mold structure, reduce additional structures, and make demolding more reliable.

[0037] In summary, the advantages of the injection mold of this application are as follows: 1. The coordinated ejection of two angled ejectors, combined with lateral core pulling and vertical ejection, effectively solves the problem of difficult demolding caused by large-volume complex shells due to large covering forces and complex structures, ensuring smooth demolding; 2. The two angled ejectors are in contact with the product 300 throughout the entire demolding process, forming a stable lifting and balancing force on the upper and lower surfaces of the product 300, avoiding defects such as displacement, deformation, sticking, and whitening, and significantly improving the yield and appearance quality of the product 300; 3. The mold structure is simplified, and the integrated angled ejectors realize the dual functions of core pulling and stable ejection, replacing the single ejector pin structure, reducing the number of parts and assembly complexity, and reducing manufacturing costs and maintenance difficulty.

[0038] Large shell-shaped injection molded parts have stringent requirements for material flowability, temperature control, and molding efficiency during the molding process. Traditional cold runners tend to produce a large amount of solidified material when transporting melt over long distances, which not only wastes material but also causes the melt temperature to drop and the pressure loss to increase due to the excessive length of the runner. This can lead to problems such as insufficient filling or excessive internal stress, especially for products with complex structures and large volumes like the 300.

[0039] Reference Figure 3 To address the aforementioned technical problems, this embodiment makes the following optimizations: The runner assembly specifically adopts a hot runner assembly 4, which includes a manifold 41, hot nozzles 42, heating elements 43, and a main runner nozzle 44. The manifold 41 is installed on the side of the front mold plate 1 away from the front mold core 101. The manifold 41 has internal runners to evenly distribute the molten plastic to each injection point. The heating elements 43 are embedded or attached to the inside of the manifold 41 to ensure that the manifold 41 maintains a constant process temperature throughout the entire operation, preventing the melt from cooling during the manifolding process. Solidification occurs when the hot nozzle 42 is installed on the bottom surface of the manifold 41 and communicates with the flow channel in the manifold 41. The end of the hot nozzle 42 with the injection port extends downward, so that the end of the hot nozzle 42 with the injection port penetrates the front mold plate 1 and further penetrates the molding cavity of the front mold core 101, so that the injection port of the hot nozzle 42 is directly connected to the molding cavity of the front mold core 101, thereby injecting the melt directly into the mold cavity 3 under high temperature and high pressure. The main runner nozzle 44 is connected to the manifold 41 as the inlet of the entire hot runner assembly 4, which is used to connect the injection molding machine nozzle and introduce the melt into the manifold 41.

[0040] With this hot runner structure, the melt is always heated and kept warm throughout the entire flow path, which minimizes the solidified waste generated by the cold runner and realizes runnerless solidified molding, which greatly saves raw material costs. At the same time, since the hot nozzle 42 directly reaches the surface of the molding cavity, the melt flow is shortened and the injection pressure loss is reduced, making the filling of the large shell product 300 more uniform and full, effectively reducing molding defects such as weld lines and shrinkage cavities caused by poor flow.

[0041] Furthermore, the number of hot nozzles 42 is multiple, such as four. The use of multiple hot nozzles 42 primarily addresses the technical problems of excessively long melt flow distances and filling difficulties during injection molding of large shells. Due to the large volume and complex structure of product 300, a single injection point would result in an excessively long melt flow path and significant pressure loss, leading to defects such as insufficient filling, obvious weld lines, or shrinkage cavities in areas far from the injection point. By setting four hot nozzles 42 for multi-point synchronous injection, the entire molding cavity is effectively divided into multiple areas for coordinated filling, significantly shortening the melt flow distance within the molding cavity and reducing injection pressure requirements. Simultaneously, multiple injection points allow for flexible adjustment of the flow rate and pressure at each gate, achieving balanced filling and effectively preventing warping deformation caused by flow imbalance.

[0042] Reference Figure 3 In order to solve the problem of achieving precise movement of the ejector plate 5 in a limited space for a large shell mold, a recessed assembly groove 102 is provided on the side of the front platen 1 away from the front mold core 101. This is the receiving cavity mentioned in the first stage of the mold's working process. The ejector plate 5 can be slidably accommodated in the assembly groove 102. This embedded groove makes full use of the thickness space of the front platen 1, making the overall structure more compact and avoiding additional mold height.

[0043] In addition, to secure the manifold 41, and also to protect and insulate it, refer to... Figure 3 A runner plate 103 is fixedly installed on the side of the front mold plate 1 away from the front mold core 101. The runner plate 103 also has a recessed receiving groove on the side away from the front mold plate 1. The manifold plate 41 is connected to the runner plate 103 by embedding through the receiving groove, so that the manifold plate 41 and the runner plate 103 form a stable connection, ensuring the installation, protection and heat insulation effect of the hot runner assembly 4. In order to further protect and insulate the manifold plate 41, an upper sealing plate 19 is also installed on the side of the runner plate 103 away from the front mold plate 1 to cover the receiving groove. The main runner nozzle 44 extends through the upper surface of the upper sealing plate 19. In addition, an upper return shaft 9 is installed between the runner plate 103 and the inner wall of the assembly groove 102. The upper return shaft 9 also slides through the ejector plate 5. The axis of the upper return shaft 9 is consistent with the mold opening and closing direction to guide the movement of the ejector plate 5.

[0044] Reference Figure 3In the first, second, and fourth stages of the mold's operation, the upper inclined ejector 7 and the lower inclined ejector 8 have a demolding movement along a horizontal direction that combines with the mold opening direction or the mold closing direction. Furthermore, before the product 300 is completely ejected, i.e., in the third stage, the ends of the upper inclined ejector 7 and the lower inclined ejector 8 always abut against the upper and lower surfaces of the product 300. The upper inclined ejector 7 moves along with the ejector plate 5. As mentioned earlier, the power structure for the movement of the ejector plate 5 can be an elastic structure or a drive source. The reason for using a power structure to allow the ejector plate 5 to drive the upper inclined ejector 7 to quickly extend out of the front mold core 101 molding cavity is that if the large shell product 300 is not supported from above in time at the moment it just leaves the front mold core 101 during the initial mold opening stage... When ejecting product 300 to the rear mold core 201, product 300 is prone to sagging deformation or even local dents due to its own weight or residual covering force. Based on this, the following optimizations are made: Specifically, a demolding spring 10 is installed between the ejector plate 5 and the runner plate 103. The demolding spring 10 is the power structure. In the mold closing state, the demolding spring 10 is in a compressed and energy-storing state. When the mold opens and the front mold plate 1 and the rear mold plate 2 separate, the demolding spring 10 immediately releases its elastic force and automatically pushes the ejector plate 5 to move towards the front mold core 101, thereby driving the upper inclined ejector 7 to extend downward into the forming cavity of the front mold core 101 at the same time, so that the end of the upper inclined ejector 7 always closely abuts against the upper surface of product 300, and forms a coordinated support posture with the lower inclined ejector 8.

[0045] Among them, the power structure for the movement of the demolding template 5 can be an elastic structure or a driving source. The demolding spring 10 is an elastic structure. The reason for using an elastic structure is that if a hydraulic or pneumatic mechanism is used to drive the upper inclined ejector 7, it will not only greatly increase the complexity of the mold, but also increase the manufacturing cost and control difficulty.

[0046] Furthermore, the purely mechanical, driveless demolding spring 10 serves as the power structure, enabling the upper inclined ejector 7 to automatically extend and conform to the surface of the product 300 at the moment of mold opening without any external driving equipment. This not only ensures that the product 300 is always supported from above during the entire process of detaching from the front mold core 101, but also completely eliminates the need for complex hydraulic or pneumatic control systems, greatly simplifying the mold structure, reducing manufacturing costs and maintenance difficulties, and making the coordinated support action of the upper inclined ejector 7 and the lower inclined ejector 8 more reliable and consistent.

[0047] Based on the use of a demolding spring 10 to replace the external drive device to achieve automatic contact between the upper inclined ejector 7 and the product 300, the uncontrollable deformation of the spring itself will cause the problem of uncontrollable extension of the upper inclined ejector 7. The specific reasons are as follows: Since the release process of the demolding spring 10 is difficult to control precisely, at the moment of mold opening, the spring may instantly exert excessive force on the demolding template 5, causing the demolding template 5 to rush to the very end of the moving path, that is, to abut against the bottom wall of the assembly groove 102 (accommodating cavity). The demolding template 5 changes from a stationary state to a movable state all at once, thus causing the upper inclined ejector 7 to extend excessively. If the ejector pin extends beyond the preset distance, it will exert excessive pressure on the upper surface of the product 300, and may even cause indentations or local deformation. More seriously, if the elastic force of the ejector spring 10 continues to act on the ejector plate 5 during the mold closing process, the upper inclined ejector pin 7 will always maintain this excessively extended state. When the upper inclined ejector pin 7 moves downward with the front plate 1 until the front plate 1 and the rear plate 2 close, the excessively extended end of the upper inclined ejector pin 7 will directly and rigidly collide or abut against the surface of the rear mold core 201. This may not only damage the inclined ejector pin and the mold core, but also cause the mold to fail to close properly, seriously affecting production safety and mold life.

[0048] Reference Figure 5 To solve this technical problem, the following optimizations are made in this embodiment: a limiting post 51 is installed on the stripping template 5. One end of the limiting post 51 is fixed to the stripping template 5, and the other end of the limiting post 51 slides through the front template 1. The end of the limiting post 51 away from the stripping template 5 is used to abut against the rear template 2, so that the end of the upper inclined top 7 away from the stripping template 5 and the rear mold core 201 maintain a gap.

[0049] In the first stage, the rear template 2 remains stationary. When the front template 1 moves away from the rear template 2, the front template 1 will drive the front mold core 101 to move upward (moving in the mold opening direction). During this process, the ejector template 5 can move within the assembly groove 102. When the ejector template 5 is in a stationary state, it is driven by the ejector spring 10 to move within the assembly groove 102. This movement refers to downward movement relative to the bottom wall of the assembly groove 102. (See reference...) Figure 5 The orientation of the mold is downward, but the mold release template 5 is stationary relative to the rear template 2. This is because the mold release template 5 is pushed by the demolding spring 10 and is in a stationary state. The mold release template 5 is not driven by the front template 1. The limiting post 51 on the mold release template 5 always abuts against the upper surface of the rear template 2. As the front template 1 continues to move upward, the mold release template 5 and the limiting post 51 move downward relative to the front template 1. The ends of the limiting post 51 and the upper inclined top 7 will be continuously exposed until the mold release template 5 is in a movable state. The mold release template 5 abuts against the bottom wall of the assembly groove 102 and is driven by the front template 1.

[0050] In the second stage, the ejector plate 5 is in a movable state, and the ejector plate 5 abuts against the bottom wall of the assembly groove 102. The distance of the limiting post 51 on the ejector plate 5 extending beyond the lower surface of the front template 1 is at its maximum. The ejector plate 5 is driven by the front template 1, so the front template 1 can drive the ejector plate 5 to move upward, thereby driving the limiting post 51 and the upper inclined top 7 to move upward, so that the limiting post 51 does not abut against the upper surface of the rear template 2. However, since the product 300 is pushed upward by the lower inclined top 8, and the upward movement distance of the upper inclined top 7 driven by the front template 1 is always equal to the upward movement distance of the lower inclined top 8 driven by the ejector plate 6, the upper inclined top 7 and the lower inclined top 8 continuously abut against the product 300, and the upper inclined top 7 also abuts against the upper surface of the product 300.

[0051] Based on the above principle, in the first stage, since the end of the limiting post 51 connected to the ejector plate 5 is always against the upper surface of the rear plate 2, the limiting post 51 also has a limiting effect on the ejector plate 5. This further prevents the ejector spring 10 from pushing the ejector plate 5 to the end of the path and against the bottom wall of the assembly groove 102 (accommodating cavity) all at once. It can only be forced to wait until the front plate 1 moves upward and the ejector plate 5 against the bottom wall of the assembly groove 102 (accommodating cavity) before it can enter the movable state. At this time, if the mold wants to move from the second stage to the third stage, it still needs to move the ejector plate 5 upward with the front plate 1 so that the end of the limiting post 51 no longer against the upper surface of the rear plate 2.

[0052] In the first stage, any downward movement of the ejector plate 5 relative to the rear platen 2 is hindered by the limiting post 51. This ensures that the ejector plate 5 remains stationary relative to the rear platen 2 and the product 300. Consequently, the force exerted by the upward-sloping ejector 7 on the upper surface of the product 300 on the ejector plate 5 remains constant and does not increase instantaneously. Even in the second stage, when the ejector plate 5 is movable, it is held against the bottom wall of the assembly groove 102 by the ejector spring 10. The ejector plate 5 can move upward with the front platen 1, and the upward movement distance of the upward-sloping ejector 7 driven by the front platen 1 is always equal to the upward movement distance of the downward-sloping ejector 8 driven by the ejector plate 6. Therefore, in both the first and second stages, the force exerted by the upward-sloping ejector 7 on the upper surface of the product 300 on the ejector plate 5 remains constant and does not increase instantaneously.

[0053] In the third stage, the ejector plate 5 is in a movable state, and the ejector spring 10 holds the ejector plate 5 against the bottom wall of the assembly groove 102. This is consistent with the second stage. The ejector plate 5 can move upward with the front template 1. The difference is that the ejector plate 6 has reached the end of its stroke and no longer moves upward. This also causes the product 300 to stop moving upward. This causes the end of the distance column 51 to no longer press against the upper surface of the rear template 2.

[0054] During the third stage of the process, the upper inclined ejector 7 does not abut against the upper surface of the product 300, the end of the limiting post 51 does not abut against the upper surface of the rear template 2, the ejector plate 5 is in a movable state, the ejector plate 5 is pressed against the bottom wall of the assembly groove 102 by the ejector spring 10, the end of the limiting post 51 away from the ejector plate 5 extends out of the lower surface of the front template 1, and the maximum length of the limiting post 51 extending out is less than or equal to the maximum distance that the ejector plate 5 moves in the assembly groove 102 along the mold opening or mold closing direction.

[0055] The entire fourth stage is the mold closing process. The end of the fourth stage is the mold closing state, that is, the front mold plate 1 and the rear mold plate 2 are closed together. At the end of the fourth stage, the end of the limiting post 51 away from the ejector plate 5 abuts against the upper surface of the rear mold plate 2 and is also flush with the lower surface of the front mold plate 1. In this state, the ejector plate 5 is still in a stationary state. In this state, the ejector plate 5 will not be higher than the assembly groove 102 (accommodation cavity), and the ejector plate 5 will not abut against the bottom of the runner plate 103.

[0056] In the fourth stage, the rear template 2 remains stationary, while the front template 1 gradually moves closer to the rear template 2, i.e., the front template 1 moves downwards. Importantly, the end of the limiting post 51 furthest from the ejector plate 5 contacts the upper surface of the rear template 2 first, causing the ejector plate 5 to enter a stationary state. Limited by the limiting post 51, the ejector plate 5 and the upper inclined ejector 7 remain stationary relative to the rear template 2 in the mold closing direction. As the front template 1 continues to move downwards, the runner plate 103 on the front template 1 compresses the ejector spring 10, which in turn further compresses the ejector plate 5. Continue moving downwards until the mold is fully closed. The limiting post 51 is completely retracted into the front mold plate 1, and the end of the limiting post 51 is still in contact with the upper surface of the rear mold plate 2. The upper inclined ejector 7 is retracted to the initial position, so that part of the outer wall of the upper inclined ejector 7 is aligned with the molding cavity wall of the front mold core 101 and forms the completed molding cavity. The contact between the limiting post 51 and the upper surface of the rear mold plate 2 restricts the demolding spring 10 from driving the upper inclined ejector 7 to continue to move downwards through the demolding plate 5, so that the end of the upper inclined ejector 7 away from the demolding plate 5 maintains a gap with the rear mold core 201, avoiding occupying the space of the mold cavity 3, so as to facilitate the next injection molding of product 300.

[0057] In summary, using the limiting post 51 as a mechanical limiting structure not only effectively prevents the upper inclined ejector 7 from excessively squeezing the product 300 due to the excessive spring force of the demolding spring 10 in the first stage of the mold opening process, but also controls the extension amount of the upper inclined ejector 7 in the fourth stage through the continuous contact between the limiting post 51 and the rear template 2, avoiding the interference risk caused by the upper inclined ejector 7 extending too far out of the mold core 201 molding cavity. In addition, the simplified structure of spring drive and high-precision control are both achieved.

[0058] Reference Figure 6When the large shell product 300 is ejected in the second stage of the ejection process, it relies solely on the downward-sloping ejector 8 for ejection. Because the edge of the shell product 300 is often far from the point of action of the downward-sloping ejector 8, if the ejection force cannot be effectively transmitted to the edge, it is very easy for the product 300 to not be smooth enough when it leaves the mold cavity 3. That is, the edge of the product 300 will have insufficient force or delayed force, resulting in asynchronous demolding. In order to solve this problem, the following optimization is made: Specifically, multiple balancing ejector pins 61 are provided on the ejector plate 6. The balancing ejector pins 61 can slide through the rear mold core 201. The bottom end of the balancing ejector pin 61 is fixed to the ejector plate 6, and the top end of the balancing ejector pin 61 is flush with the bottom wall of the molding cavity of the rear mold core 201. The multiple balancing ejector pins 61 are distributed at intervals around the center of the ejector plate 6 and are all arranged opposite to the edge area of ​​the molding cavity of the rear mold core 201, that is, evenly arranged around the periphery of the product 300. Therefore, the top end of each balancing ejector pin 61 abuts against the lower surface of the product 300 near the edge. When the ejector plate 6 is pushed upward, all the balance ejector pins 61 move synchronously, applying ejection force from the edges around the product 300 at the same time, forming a multi-point coordinated ejection system with the downward inclined ejector 8.

[0059] In summary, this structure of balanced ejector pins 61 arranged in a ring effectively transmits and evenly distributes the ejection force to the edge of the product 300. This ensures that the edge of the product 300 is subjected to force synchronously with the central area and smoothly detaches during the ejection process. It further effectively prevents edge warping or deformation caused by uneven local force, while reducing the single burden on the downward inclined ejector pin 8, making the ejection process more stable and reliable, and providing a strong guarantee for the high-quality molding of large and complex shells.

[0060] Reference Figure 6 During the ejection process of the large shell product 300, because the central area of ​​the shell product 300 often has a deep structure and a large covering force, if the ejection force cannot be effectively applied to this area, it is easy for the central part of the product 300 to undergo concave or tensile deformation when it leaves the mold cavity 3, affecting the overall dimensional accuracy and appearance quality. Based on this, the following optimizations are made: Specifically, multiple central ejector pins 62 are spaced apart on the ejector plate 6. The central ejector pins 62 slide through the rear mold core 201. The bottom end of the central ejector pin 62 is fixed to the ejector plate 6, and the top end of the central ejector pin 62 is flush with the bottom wall of the molding cavity of the rear mold core 201. The multiple central ejector pins 62 are spaced apart and are all positioned opposite to the central area of ​​the molding cavity of the rear mold core 201, which is equivalent to abutting against the central area of ​​the lower surface of the product 300, that is, focusing the force on the central area of ​​the bottom of the product 300. When the ejector plate 6 is pushed forward, all the center ejector pins 62 move synchronously, applying ejection force directly from the center of the product 300, forming an all-round ejection system from the center to the edge together with the downward inclined ejector 8 and the balanced ejector pins 61 distributed around the edge.

[0061] In summary, through this structure in which the central ejector pin 62 and the balancing ejector pin 61 work together, the ejection force is evenly covered and precisely applied to the bottom of the product 300. This ensures that the central area and the edge parts of the product 300 are simultaneously stressed and smoothly detached during the ejection process. This further effectively prevents local dents or deformations caused by insufficient force in the central area. At the same time, it further disperses the load of the downward inclined ejector pin 8 and the balancing ejector pin 61, making the entire ejection process more balanced and reliable. This provides a more complete ejection guarantee for the high-quality molding of large and complex shells.

[0062] Reference Figures 6-7 As mentioned earlier, the central area of ​​the shell product 300 often has a deeper structure and greater coverage. Taking the shell of a robotic vacuum cleaner as an example, the recessed area near the center is mainly used to install functional modules such as the dust box, water tank, and battery. These functional requirements directly determine that the product 300 must form a specific recessed structure in the central area. Based on this, a recessed groove 2011 is provided in the molding cavity of the rear mold core 201, and a mating part 1011 adapted to the recessed groove 2011 is provided on the front mold core 101. When the front mold core 101 and the rear mold core 201 are molded together, the mating part 1011 extends into the recessed groove 2011, but the two are not completely fitted together, but a required gap is reserved. This gap is part of the mold cavity 3. After the molten plastic is injected and cooled and solidified, a recessed part with the same shape as the recessed groove 2011 is formed in the central area of ​​the product 300, thereby meeting the functional requirements of installing components such as the dust box and water tank in the robotic vacuum cleaner shell.

[0063] The recessed areas of product 300 are typically irregularly shaped. These recessed areas refer to deep cavities, such as those on the shell of a robotic vacuum cleaner, used to install dustbins, water tanks, etc. Overall, some recesses are deep, while others are shallow. Deeper recesses, due to their large sidewall coverage area and concentrated demolding resistance, and because they are primarily used to install other structures (e.g., dustbins and water tanks on the shell of a robotic vacuum cleaner), require undercuts or openings on the inner wall of the recessed area. The presence of lateral undercuts and openings can lead to tearing or demolding difficulties for product 300 during the demolding process. Furthermore, relying solely on the central ejector pin 62 to push the product out from the bottom is insufficient to overcome the sidewall covering force and cannot achieve lateral core pulling, easily causing wear on the recessed sidewalls or deformation of product 300.

[0064] Reference Figures 7-8To address the aforementioned issues, this embodiment employs the following optimizations: A release-assist angled ejector 52 is installed on the ejector platen 5. This ejection-assist angled ejector 52 slidably penetrates the mating portion 1011 of the front mold core 101, and a portion of the outer wall of the ejection-assist angled ejector 52 directly constitutes a portion of the sidewall of the mating portion 1011, thereby participating in the formation of the upper sidewall of the recessed area during molding. Simultaneously, a push-assist angled ejector 63 and a push-assist ejector pin 64 are installed on the ejector plate 6. The push-assist angled ejector 63 slidably penetrates the rear mold core 201 and extends into the recessed groove 2011. A portion of the outer wall of the push-assist angled ejector 63 constitutes a portion of the sidewall of the recessed groove 2011. The ejection-assist angled ejector 52 and the push-assist angled ejector 63 are arranged opposite to each other, forming a top-to-bottom corresponding angled ejector combination. The push-assist ejector pin 64 slidably penetrates the rear mold core 201 and corresponds to the bottom area of ​​the recessed groove 2011.

[0065] In the first and second stages of the mold opening process, the ejector pin 52 moves downward with the ejector plate 5, and the pusher pin 63 moves upward with the ejector plate 6. As ejector pins, the ejector pin 52 and the pusher pin 63 are also inclined. While moving along the mold opening direction, the guide effect of the inclined surface at the through position allows the ejector pin 52 and the pusher pin 63 to generate lateral displacement and vertical displacement, thereby performing lateral core pulling on the side wall of the recessed part, effectively removing the covering and undercut of the recessed part of the product 300 and the mold core at the side wall. At the same time, the pusher pin 64 directly applies the ejection force from the bottom of the recessed part to eject the recessed part, and the pusher pin 63 directly applies the ejection force from the edge of the recessed part to assist in the ejection of the recessed part.

[0066] Furthermore, during the ejection process, the ejector 52 and the pusher 63 together provide targeted support for the deeper recessed areas. Similar to the aforementioned upper and lower ejectors 7 and 8, the simultaneous support from the ejector 52 and pusher 63 applies a pair of upper and lower support forces to the deeper recessed areas during ejection. This provides stable support for the product 300 during demolding, guiding it to smoothly detach from the rear mold core 201. Only after the product 300 has completely detached from the mold cavity 3 does the ejector 52 release its contact with the product 300, i.e., the third stage. This effectively avoids localized depressions or demolding difficulties caused by the large contact area between the recessed areas of the product 300 and the mold, resulting in high demolding resistance during ejection.

[0067] In the fourth stage, the ejector 52 and the pusher 63 are reset in the opposite direction along with the ejector plate 5 and the ejector plate 6, respectively, so as to re-fit with the mating part 1011 or the recessed groove 2011 to form a complete molding cavity for the next injection molding.

[0068] In summary, the effect of using the ejector-assisted angled ejector 52, the pusher-assisted angled ejector 63, and the pusher-assisted ejector pin 64 to help eject the recessed part of product 300 is as follows: By setting up the ejector-assisted angled ejector 52, the pusher-assisted angled ejector 63, and the pusher-assisted ejector pin 64, the problems of high demolding resistance and easy tearing and deformation caused by the deep cavity, undercut, and through-hole structure of the recessed part of product 300 are specifically solved. In the first and second stages, the ejector-assisted angled ejector 52 and the pusher-assisted angled ejector 63 generate a lateral core-pulling action while moving vertically, effectively releasing the side wall covering and undercut locking. Together with the pusher-assisted ejector pin 64 to assist in ejecting the bottom of the recess, it achieves multi-point coordinated force and full-process dynamic support for the recessed area. Multi-point coordinated force means that the ejector-assisted angled ejector 52, the pusher-assisted angled ejector 63, and the pusher-assisted ejector pin 64 jointly apply force to the recessed part of product 300. Full-process dynamic support means that in the second stage, the ejector-assisted angled ejector 52, the pusher-assisted angled ejector 63, and the pusher-assisted ejector pin 64 apply force to the recessed part of product 300. The position of the recessed part is adjusted so that the front template 1 can be adjusted to position the ejector pin 52, ensuring that the ejector pin 52, the pusher pin 63, and the pusher pin 64 are always in contact with the surface of the product 300. This ensures that the product 300 is subjected to uniform, stable, and smooth force during the process of detaching from the mold cavity 3, avoiding wear on the recessed sidewall or deformation of the product 300 caused by local stress concentration. This improves the demolding quality and yield of complex recessed structures, while ensuring the functional dimensional accuracy and installation adaptability of the recessed part, making the mold operation more stable and reliable.

[0069] Reference Figure 7 Relying solely on the push pin 64 to apply force from the center of the recessed bottom is insufficient for evenly distributing the ejection force in large or complex bottom areas, easily leading to excessive ejection at the center and lag at the edges. Therefore, the following optimization is made: Specifically, a push groove 11 is provided on the bottom wall of the recessed groove 2011, and a push part 12 is correspondingly installed on the push inclined top 63. The push part 12 serves as an extension of the push inclined top 63 and extends into the push groove 11. During the molding of the product 300, part of the outer wall of the push part 12 participates in forming part of the bottom wall of the recessed groove 2011, and together with other parts of the bottom wall of the recessed groove 2011, shapes part of the bottom of the product 300.

[0070] In the second stage of the mold opening process, the pusher 63 moves upward while driving the pusher part 12 to move synchronously, directly applying the ejection force from the bottom edge area of ​​the recessed part. This forms a multi-point coordinated ejection system with the pusher pin 64 ejecting from the center area, making the bottom of the recessed part of the product 300 more evenly distributed.

[0071] In summary, the combined structure of the pusher 12 and the pusher pin 64 achieves multi-point ejection and balanced force application to the bottom of the recessed area of ​​product 300, effectively distributing the ejection load of the pusher pin 64 and avoiding localized stress concentration and bottom deformation caused by single-point ejection. Furthermore, since the pusher 12 moves with the pusher angled pusher 63, its ejection trajectory is coordinated with the sidewall core-pulling action. During a period of ejection of the recessed area of ​​product 300, the pusher 12 directly... The bottom wall of the recessed part is used to form part of the bottom wall of the recessed groove 2011. The end of the pusher 63 acts on the outer wall of the recessed part, that is, the pusher 63 abuts against the side wall next to the location of the pusher 12. Therefore, the pusher 12 can focus on the release of the recessed part. The pusher 63 abuts against the side wall of the recessed part of the product 300, which can help the recessed part to be demolded smoothly, further improving the stability and reliability of the overall demolding of the recessed part.

[0072] The inner wall of product 300 often requires thin sheet-like structures to increase structural strength or meet the needs of product 300 itself. Therefore, a forming groove is provided on the inner wall of the forming cavity of the rear mold core 201. This forming groove is used to form thin sheet-like protrusions on the surface of product 300, such as reinforcing ribs or protruding ribs required for the function of product 300 itself. However, reinforcing ribs or functional protrusions are usually slender and thin. If the force is uneven or the local stress is too large during ejection, cracks or even breakage can easily occur at the root, causing product 300 to be scrapped.

[0073] Based on the above, this type of thin-walled protrusion structure is prone to breakage or damage during demolding due to its low strength and concentrated demolding resistance. Therefore, the following optimizations are made: (Refer to...) Figure 6 Specifically, the ejector plate 6 is provided with an anti-breakage ejector pin 14, which slides through the rear mold core 201 and is located on the side of the molding groove, that is, adjacent to the edge area of ​​the thin sheet protrusion structure.

[0074] In the second stage, when the ejector plate 6 pushes forward, the anti-breakage ejector pin 14 moves synchronously, applying an auxiliary ejection force from the vicinity of the thin sheet protrusion structure, and providing targeted stress distribution to the vulnerable part. This achieves local reinforcement ejection of the thin sheet protrusion area, effectively dispersing the concentrated stress acting on the reinforcing rib or the root of the functional protrusion during the demolding process, and avoiding breakage or damage caused by excessive force on a single ejection point.

[0075] Reference Figure 3 and Figure 7A square iron part 15 is provided on the side of the rear mold plate 2 away from the rear mold core 201, which serves to support and elevate the rear mold plate 2, leaving enough space for the movement of the ejector plate 6. A lower sealing plate 16 is provided on the side of the square iron part 15 away from the rear mold plate 2. The lower sealing plate 16, the rear mold plate 2, and the square iron part 15 together form a frame structure with a cavity, which accommodates the ejector plate 6 in the cavity of the frame structure. At the same time, a lower return post 17 is installed between the lower sealing plate 16 and the rear mold plate 2, which penetrates the ejector plate 6. The axis of the lower return post 17 is parallel to the mold opening direction, which provides guidance for the reciprocating sliding of the ejector plate 6 and ensures that the ejector plate 6 remains horizontal and does not wobble during the movement.

[0076] In addition, the lower sealing plate 16 is provided with corresponding through holes or interfaces for external ejection mechanisms (such as ejector rollers of injection molding machines) to pass through the through holes or interfaces and connect with the ejector plate 6. Furthermore, a return spring 18 is installed between the rear template 2 and the ejector plate 6 to assist the ejector plate 6 in resetting after the ejection action is completed.

[0077] This injection mold is primarily optimized to address the demolding challenges and molding requirements of large and complex shells, such as those for robotic vacuum cleaners. The core effects are as follows: The use of upper and lower inclined ejectors 7 and 8 for coordinated ejection, with both constantly contacting the product 300 throughout the first and second stages, combined with lateral core pulling and vertical ejection, effectively prevents product 300 displacement, deformation, and sticking during demolding, ensuring smooth demolding and dimensional stability of the product 300. The application of the hot runner assembly 4 eliminates solidified material in the cold runner, saving raw materials and shortening the melt flow. The purely mechanical structure of the ejector spring 10 and the spacer post 51 ensures that the upper inclined ejector 7 automatically contacts the upper surface of the product 300 when the mold opens. The mold structure is simplified and the cost is reduced. At the same time, the extension of the upper inclined ejector 7 is controlled to avoid excessive extrusion or mold closing interference. The surrounding balanced ejector pins 61 and the center ejector pin 62 work together to achieve targeted ejection of the product 300 from the edge to the center, preventing edge warping and center depression, and distributing the ejection load. The ejection-assisting inclined ejector 52, the pushing inclined ejector 63 and the pushing ejector pin 64 (including the pushing part 12) specifically solve the demolding problem of the deep cavity recess of the product 300, remove the side wall covering and undercut locking, avoid local deformation and tearing, and ensure the functional accuracy of the recessed part. The anti-breakage ejector pin 14 specifically distributes the demolding stress of the thin sheet protrusion structure to prevent its root from breaking.

[0078] In the description of this specification, the references to terms such as "embodiment," "one implementation," "some implementations," "illustrative implementation," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with the described implementation or example is included in at least one implementation or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same implementation or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more implementations or examples.

[0079] The technical principles of this application have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this application and should not be construed as limiting the scope of protection of this application in any way. Based on the explanation herein, those skilled in the art can conceive of other specific embodiments of this application without creative effort, and these equivalent variations or substitutions are all included within the scope defined by the claims of this application.

Claims

1. An injection mold, characterized in that, include: The front template (1) has a front mold core (101) on one side. The rear template (2) has a rear mold core (201) on one side. The molding cavities on the front mold core (101) and the rear mold core (201) together enclose the mold cavity (3). A flow channel assembly is disposed on the front mold plate (1), and the injection port of the flow channel assembly is connected to the molding cavity on the front mold core (101); The ejector template (5) is movably disposed on the side of the front template (1) away from the front mold core (101). The ejector template (5) has a stationary state and a movable state. In the stationary state, when the front template (1) drives the front mold core (101) to open or close the mold, the ejector template (5) does not move with the front template (1) and remains stationary relative to the rear template (2). In the movable state, the ejector template (5) moves with the front template (1). Ejector plate (6) is movably disposed on the side of the rear template (2) away from the rear mold core (201), and the ejector plate (6) can move along the mold opening and mold closing directions; The upper inclined top (7) is installed at one end on the stripping template (5) and slides through the front mold core (101) at the other end. A portion of the outer wall of the upper inclined top (7) forms part of the inner wall of the forming cavity of the front mold core (101). The lower inclined ejector (8) is installed at one end on the ejector plate (6) and slides through the rear mold core (201) at the other end. A portion of the outer wall of the lower inclined ejector (8) forms part of the inner wall of the molding cavity of the rear mold core (201).

2. The injection mold according to claim 1, characterized in that, The runner assembly is a hot runner assembly (4), which includes a manifold (41), a hot nozzle (42), a heating element (43), and a main runner nozzle (44). The manifold (41) is located on the side of the front mold plate (1) away from the front mold core (101). The heating element (43) is located on the manifold (41). The hot nozzle (42) is located on the manifold (41) and is also connected to the runner in the manifold (41). The hot nozzle (42) has the injection port, and one end of the hot nozzle (42) with the injection port passes through the front mold plate (1) and the front mold core (101) and is connected to the molding cavity of the front mold core (101). The main runner nozzle (44) is located on the manifold (41) and is connected to the runner in the manifold (41).

3. The injection mold according to claim 2, characterized in that, The front template (1) has an assembly groove (102) on the side away from the front mold core (101), and the ejector plate (5) is slidably disposed in the assembly groove (102); a runner plate (103) is also installed on the side of the front template (1) away from the front mold core (101), and the flow divider plate (41) is embedded in the runner plate (103); an upper return shaft (9) is installed between the runner plate (103) and the inner wall of the assembly groove (102), and the upper return shaft (9) also slides through the ejector plate (5), and the axial direction of the upper return shaft (9) is consistent with the mold opening and mold closing direction.

4. The injection mold according to claim 3, characterized in that, A demolding spring (10) is installed between the demolding template (5) and the runner plate (103); a limiting post (51) is installed on the demolding template (5), and the end of the limiting post (51) away from the demolding template (5) slides through the front template (1); the end of the limiting post (51) away from the demolding template (5) is used to abut against the rear template (2), so that the end of the upper inclined top (7) away from the demolding template (5) maintains a gap with the rear mold core (201).

5. The injection mold according to claim 1, characterized in that, The ejector plate (6) is provided with a plurality of balancing ejector pins (61), which are slidably inserted through the rear mold core (201); the plurality of balancing ejector pins (61) are distributed at a central interval around the ejector plate (6), and are all arranged opposite to the edge of the molding cavity of the rear mold core (201).

6. The injection mold according to claim 1, characterized in that, The ejector plate (6) is provided with a plurality of central ejector pins (62) spaced apart. The central ejector pins (62) can slide through the rear mold core (201), and the plurality of central ejector pins (62) are arranged opposite to the central area of ​​the molding cavity of the rear mold core (201).

7. The injection mold according to claim 1, characterized in that, The inner wall of the molding cavity of the rear mold core (201) is provided with a molding groove, which is used to form thin sheet protrusions on the surface of the product. The ejector plate (6) is provided with an anti-breakage ejector pin (14), which can slide through the rear mold core (201) and is located on the side of the molding groove.

8. The injection mold according to claim 1, characterized in that, The rear template (2) has a square iron part (15) on the side away from the rear mold core (201), and a lower sealing plate (16) is provided on the side of the square iron part (15) away from the rear template (2); a lower return post (17) that penetrates the ejector plate (6) is installed between the lower sealing plate (16) and the rear template (2); a return spring (18) is installed between the rear template (2) and the ejector plate (6).

9. An injection mold according to any one of claims 1-8, characterized in that, The molding cavity of the rear mold core (201) has a recessed groove (2011), and the front mold core (101) has a mating part (1011) that is adapted to the recessed groove (2011); the ejector plate (5) is equipped with an ejector lifting tip (52), which slidably passes through the mating part (1011) of the front mold core (101), and a portion of the outer wall of the ejector lifting tip (52) constitutes a portion of the side wall of the mating part (1011); the ejector plate (6) is equipped with There are a pusher ejector (63) and a pusher ejector pin (64). The pusher ejector (63) can slide through the rear mold core (201) and extend into the recessed groove (2011). A portion of the outer wall of the pusher ejector (63) forms a portion of the sidewall of the recessed groove (2011). The release ejector (52) and the pusher ejector (63) are arranged opposite to each other. The pusher ejector pin (64) can slide through the rear mold core (201) and corresponds to the recessed groove (2011).

10. An injection mold according to claim 9, characterized in that, The bottom wall of the recessed groove (2011) is provided with a booster groove (11), and a booster part (12) is installed on the booster sloping top (63). The booster part (12) extends into the booster groove (11), and part of the outer wall of the booster part (12) constitutes part of the bottom wall of the recessed groove (2011).

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