Ejection mechanism for injection moulds
By designing the ejection mechanism of the injection mold and using components such as ejector blocks and gate ejector pins, the problems of mold thickness adaptability and difficulty in ejection jamming and reset were solved, thus achieving stable and efficient production.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 江苏君华特种高分子材料股份有限公司
- Filing Date
- 2025-07-04
- Publication Date
- 2026-07-03
AI Technical Summary
Existing injection mold ejection mechanisms are limited by the size of injection molding machines, cannot adapt to mold thickness, and suffer from problems such as ejection jamming, tearing, and difficulty in resetting, making continuous mass production impossible.
An ejection mechanism for an injection mold was designed, which adopts an ejection block ejection form and includes components such as an ejection block, a gate ejector rod, a push plate, a guide rod, and a return spring. These components are connected by locking screws to achieve mold thickness reduction and synchronous ejection, thus solving the problems of ejection jamming and return difficulty.
It has achieved enhanced mold thickness adaptability, stable ejection, solved ejection jamming and reset difficulties, improved production efficiency and reliability, and reduced failure rate.
Smart Images
Figure CN224446730U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of injection mold technology, and in particular to an ejection mechanism for an injection mold. Background Technology
[0002] For some injection-molded products such as flanged bushings and bushings, existing injection molds typically use ejector sleeves or push plates to eject the molded product. However, in practical applications, because the mold thickness cannot exceed the stroke of the injection molding machine, these structures are affected by the size of the injection molding machine and cannot be adapted to production. In addition, existing ejection mechanisms often experience problems such as jamming, tearing, and incomplete reset during production, making continuous mass production impossible.
[0003] Therefore, it is necessary to design an ejection mechanism for injection molds to solve the above problems. Utility Model Content
[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing an ejection mechanism for injection molds.
[0005] The technical solution of this utility model is: an ejection mechanism for an injection mold, including a base and a lower mold frame disposed on the base; a core mold fixing plate is embedded in the bottom of the lower mold frame; a mold core and a sprue core are disposed on the core mold fixing plate; an installation groove for the mold core and the sprue core to extend out is provided on the top of the lower mold frame; an ejection block that fits against the mold core and the sprue core is movably disposed in the installation groove; and an ejection assembly for driving the ejection block to eject the molded product is provided in the middle of the base.
[0006] The base includes a base plate; the two sides of the base plate are connected to the lower mold frame through pads; the base plate is provided with locking screws at both ends of the pads, which are threaded through the pads and connected to the lower mold frame.
[0007] The ejection assembly includes a push plate and an ejector block ejector rod and a sprue ejector rod disposed on the push plate; the ejector block ejector rod passes through the core mold fixing plate and the lower mold frame in sequence and abuts against the bottom of the ejector block; the sprue ejector rod passes through the core mold fixing plate and the lower mold frame in sequence and extends into the sprue core.
[0008] The bottom of the push plate is provided with a push rod fixing plate; the ejector block push rod and the gate push rod are limited in the push plate by a step; the push rod fixing plate is used to fix the ejector block push rod and the gate push rod to the push plate.
[0009] The top rod fixing plate has guide rods fixed at both ends, which are connected to the lower mold frame; the push plate is slidably connected to the guide rods.
[0010] The push plate has four rectangular reset rods that penetrate the lower mold frame; a reset spring is sleeved on the reset rod between the lower mold frame and the push plate.
[0011] The push plate has multiple locating posts arranged in a rectangular shape that limit the bottom of the lower mold frame.
[0012] By adopting the above technical solution, this utility model has the following beneficial effects: The ejection mechanism of this utility model adopts an ejection block ejection form to replace the existing push plate or ejector pin ejection structure, which not only reduces the overall mold thickness and meets the requirements of injection molding equipment; in addition, in actual application, the ejection block ejection form provides stable ejection and solves the problems of ejection jamming, tearing, and difficulty in resetting that exist in the existing ejection structure. Attached Figure Description
[0013] To make the contents of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.
[0014] Figure 1 This is a schematic diagram of the structure of this utility model.
[0015] Figure 2 This is a cross-sectional view of the present invention.
[0016] The labels in the attached diagram are:
[0017] Base 1, base plate 1-1, pad block 1-2, lower mold frame 2, core mold fixing plate 3, mold core 4, gate core 5, ejector block 6, ejector assembly 7, push plate 7-1, ejector block ejector rod 7-2, gate ejector rod 7-3, ejector rod fixing plate 7-4, guide rod 7-5, reset rod 7-6, reset spring 7-7, limit post 7-8. Detailed Implementation
[0018] (Example 1)
[0019] See Figure 1 and Figure 2 An ejection mechanism for an injection mold according to this embodiment includes a base 1 and a lower mold frame 2 disposed on the base 1; a core mold fixing plate 3 is embedded at the bottom of the lower mold frame 2; a mold core 4 and a sprue core 5 are disposed on the core mold fixing plate 3; an installation groove is provided at the top of the lower mold frame 2 for the mold core 4 and the sprue core 5 to extend out; an ejection block 6 is movably disposed in the installation groove and fits against the mold core 4 and the sprue core 5; an ejection assembly 7 for driving the ejection block 6 to eject the molded product is provided in the middle of the base 1.
[0020] Furthermore, the base 1 includes a base plate 1-1; both sides of the base plate 1-1 are connected to the lower mold frame 2 via pads 1-2; the base plate 1-1 is provided with locking screws at both ends of the pads 1-2, which thread through the pads 1-2 and connect directly to the lower mold frame 2. This embodiment uses locking screws that thread through the pads 1-2 and connect directly to the lower mold frame 2, providing a simple, robust, and highly rigid connection method. It avoids the complex steps of assembling the base 1 assembly first and then connecting it to the lower mold frame 2, improving assembly efficiency and connection strength, and ensuring the overall structural stability when the ejection mechanism operates.
[0021] Furthermore, the ejection assembly 7 includes a push plate 7-1 and an ejector block ejector rod 7-2 and a sprue ejector rod 7-3 disposed on the push plate 7-1. The ejector block ejector rod 7-2 passes through the core mold fixing plate 3 and the lower mold frame 2 in sequence and abuts against the bottom of the ejector block 6. The sprue ejector rod 7-3 passes through the core mold fixing plate 3 and the lower mold frame 2 in sequence and extends into the sprue core 5. In this embodiment, a sprue ejector rod 7-3 is provided to specifically handle the sprue material. It extends directly into the interior of the sprue core 5, which can accurately and reliably eject the sprue material from the small sprue core 5, preventing it from sticking and causing production interruption. In addition, the ejector block ejector rod and the sprue ejector rod 7-3 are both fixed on the same push plate 7-1, ensuring that the main product and the sprue material can be ejected synchronously, with coordinated actions, improving efficiency and reliability.
[0022] Furthermore, the bottom of the push plate 7-1 is provided with a push rod fixing plate 7-4; the ejector block push rod 7-2 and the gate push rod 7-3 are limited in the push plate 7-1 by a step; the push rod fixing plate 7-4 is used to fix the ejector block push rod 7-2 and the gate push rod 7-3 to the push plate 7-1. This embodiment, through the combination of step limiting and push rod fixing plate 7-4 pressing, greatly enhances the reliability and stability of the connection between the push rod and the push plate 7-1, avoids loosening or falling off during frequent ejection / reset cycles, and ensures effective transmission of ejection force.
[0023] Furthermore, guide rods 7-5 connected to the lower mold frame 2 are fixed at both ends of the ejector plate 7-4; the push plate 7-1 is slidably connected to the guide rods 7-5. In this embodiment, the guide rods 7-5 reduce friction and wear of moving parts, thereby improving the service life of the entire ejection mechanism.
[0024] Furthermore, the push plate 7-1 has four rectangularly distributed reset rods 7-6 that penetrate the lower mold frame 2; a reset spring 7-7 is sleeved on the reset rod 7-6 between the lower mold frame 2 and the push plate 7-1.
[0025] Furthermore, the push plate 7-1 has a plurality of limiting posts 7-8 arranged in a rectangular shape to limit the bottom of the lower mold frame 2.
[0026] The ejection mechanism design in this embodiment utilizes a series of ingenious structures, such as: space provided by pads 1-2, simplified connection by locking screws, simultaneous ejection of the main component and gate by double ejector rods, reliable fixing of the ejector rods by step limiters and fixing plates, precise guidance by guide rods 7-5, automatic reset by rectangularly distributed reset springs 7-7, and precise positioning and protection of the springs by limit posts 7-8. These features enable reliable, smooth, and precise product ejection and gate separation, as well as fast, accurate, and stable reset. These designs effectively improve the reliability, stability, and production efficiency of mold operation, and reduce the failure rate.
[0027] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. An ejection mechanism for an injection mold, characterized by: The system includes a base (1) and a lower mold frame (2) mounted on the base (1); a core mold fixing plate (3) is embedded at the bottom of the lower mold frame (2); a mold core (4) and a sprue core (5) are mounted on the core mold fixing plate (3); an installation groove is provided at the top of the lower mold frame (2) for the mold core (4) and the sprue core (5) to extend out; an ejector block (6) is movably mounted in the installation groove and fits against the mold core (4) and the sprue core (5); and an ejector assembly (7) is provided in the middle of the base (1) for driving the ejector block (6) to eject the molded product.
2. A mechanism for ejecting a molded article from a mold cavity in a mold according to claim 1, wherein: The base (1) includes a base plate (1-1); the two sides of the base plate (1-1) are connected to the lower mold frame (2) through pads (1-2); the base plate (1-1) is provided with locking screws that pass through the pads (1-2) and are threadedly connected to the lower mold frame (2) at both ends of the pads (1-2).
3. The ejection mechanism of an injection mold according to claim 1, characterized in that: The ejection assembly (7) includes a push plate (7-1) and an ejector block ejector rod (7-2) and a gate ejector rod (7-3) disposed on the push plate (7-1); the ejector block ejector rod (7-2) passes through the core mold fixing plate (3) and the lower mold frame (2) in sequence and abuts against the bottom of the ejector block (6); the gate ejector rod (7-3) passes through the core mold fixing plate (3) and the lower mold frame (2) in sequence and extends into the gate core (5).
4. A mechanism for ejecting a molded article from a mold cavity in a mold according to claim 3, wherein: The bottom of the push plate (7-1) is provided with a top rod fixing plate (7-4); the ejector block top rod (7-2) and the gate top rod (7-3) are limited in the push plate (7-1) by a step; the top rod fixing plate (7-4) is used to fix the ejector block top rod (7-2) and the gate top rod (7-3) on the push plate (7-1).
5. A ejection mechanism for an injection mold as defined in claim 4, wherein: The top rod fixing plate (7-4) has guide rods (7-5) fixed at both ends, which are connected to the lower mold frame (2); the push plate (7-1) is slidably connected to the guide rods (7-5).
6. The ejection mechanism of an injection mold according to claim 3, characterized in that: The push plate (7-1) has four rectangularly distributed reset rods (7-6) that penetrate the lower mold frame (2); a reset spring (7-7) is sleeved on the reset rod (7-6) between the lower mold frame (2) and the push plate (7-1).
7. The ejection mechanism of an injection mold according to claim 3, characterized in that: The push plate (7-1) has multiple limiting posts (7-8) arranged in a rectangular shape to limit the bottom of the lower mold frame (2).