Three-time ejection structure applied to injection mold

Abstract

The invention discloses a three-time ejection structure applied to an injection mold. The three-time ejection structure comprises a first fixing plate, a second fixing plate, a pillow plate, a first springboard, a second springboard, a floating plate, a guide column assembly, a spring assembly, a shell and an ejection limiting structure. Guiding and positioning of all the components are achieved through the guide column assembly, a guiding limiting groove in the shell is matched with an elastic spring bolt of the springboard, graded locking is formed by an ejector block of the floating board and the elastic spring bolt, and stroke limiting is achieved through a limiting buckle and a limiting block. According to the structure, the problems of easy deformation and adhesion, asynchronous movement, clamping stagnation, unreliable locking and the like of a product of the existing ejection mechanism are solved, the ejection force is dispersed through three-time graded ejection, the accurate and smooth movement is ensured, the product quality and the production efficiency are improved, and the service life of a mold is prolonged.

Description

Technical Field

[0001] This invention relates to injection mold ejection technology, specifically to a three-stage ejection structure applied in injection molds, suitable for ejection operations of injection molded parts with complex structures, deep cavities, or undercuts. Background Technology

[0002] In injection molding, the ejection process is a crucial step in removing the molded part from the mold cavity, and its effectiveness directly determines product quality and production efficiency. For injection molded parts with complex structures, deep cavities, or undercuts, existing ejection technologies have significant drawbacks: First, in single-ejection structures, the ejection force is concentrated on a localized area of ​​the product, easily leading to deformation, cracking, or adhesion to the mold cavity. This is especially problematic for complex parts, resulting in low ejection success rates and high scrap rates. Second, simple two-stage ejection structures lack precise grading, positioning, and guiding mechanisms. During ejection, components such as ramps and floating plates move asynchronously, resulting in insufficient limiting accuracy and a tendency for ejection jamming, severely impacting production continuity and efficiency. Third, the locking and unlocking mechanisms in existing multi-ejection structures are poorly designed and unreliable, prone to premature or incomplete unlocking, leading to ejection failure. This not only affects product quality but also accelerates wear on mold components and shortens mold lifespan.

[0003] Therefore, there is an urgent need for an ejection structure that can disperse the ejection force, achieve precise hierarchical positioning and guidance, and provide reliable locking, in order to solve the above-mentioned technical problems. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a three-stage ejection structure for use in injection molds. Through the design of graded locking and guiding limits, it solves the problems of easy product deformation and adhesion, asynchronous movement and jamming, and unreliable locking in existing ejection mechanisms.

[0005] To achieve the above and other related objectives, the technical solution provided by this invention is: a three-ejection structure applied in injection molds, comprising a first fixed plate, a second fixed plate, a pillow plate, a first jump plate, a second jump plate, a floating plate, a guide post assembly, and a spring assembly. The first fixed plate is horizontally arranged, with two pillow plates fixed to opposite sides of the first fixed plate. The floating plate is disposed on the first fixed plate and located between the two pillow plates. The guide post assembly is vertically fixed to the top side of the floating plate. The first jump plate, the second jump plate, and the second fixed plate are stacked and sleeved on the guide post assembly. The second fixed plate is supported by the two pillow plates. The spring assembly is sleeved on the guide post assembly, with one end abutting against the floating plate and the other end abutting against the second fixed plate. The side of the second fixed plate is fixed... The device includes a housing with a through slot on its inner side. The housing also includes a guide limiting groove corresponding to the first springboard and a guide limiting groove corresponding to the second springboard. The first springboard has a resilient locking tongue on its side, which slides in the first guide limiting groove. The second springboard has a resilient locking tongue on its side, which slides in the second guide limiting groove. A top block is fixed to the side of the floating plate and inserted into the slot. A latching groove is provided on the inner side of the top block, matching the first and second resilient locking tongues. A vertically arranged limiting buckle is fixed to the side of the fixed plate. A limiting block is fixed to the side of the floating plate, with a limiting hole on the limiting block into which the limiting buckle is inserted.

[0006] The preferred technical solution is as follows: the first elastic locking tongue and the second elastic locking tongue have the same structure, both including a locking tongue body and an elastic element. The sides of the first and second springboards are provided with mounting grooves. The locking tongue body is inserted into the mounting groove and is restricted to move within a certain range along the groove depth direction. The elastic element is provided in the mounting groove, with one end of the elastic element abutting against the bottom end of the locking tongue body and the other end abutting against the bottom of the mounting groove.

[0007] The preferred technical solution is that the guide post assembly has at least four posts, which are evenly distributed at the four corners of the floating plate.

[0008] The preferred technical solution is that the elastic element is a compression spring.

[0009] The preferred technical solution is as follows: the top sidewalls of the first guide limiting groove and the second guide limiting groove are configured as a ramp structure, and the top of the latch body is provided with a chamfer structure, which is matched and matched with the ramp structure.

[0010] Due to the application of the above technical solution, the beneficial effects of this invention are as follows:

[0011] The three-stage ejection design disperses the traditional single concentrated ejection force into three ejection stages, effectively avoiding product deformation, cracking, or adhesion to the cavity caused by concentrated ejection force, and significantly improving the ejection success rate and product qualification rate of complex injection molded parts.

[0012] By cooperating with the guide column assembly and the guide limiting grooves one and two on the shell, the movement of the first and second scaffolds and the second fixed plate is provided with double guidance and limiting, ensuring the synchronicity of the movement of each component and the accuracy of the trajectory. This completely solves the problem of asynchronous movement and easy jamming of the existing ejection structure, and ensures the continuity of production.

[0013] The elastic locking tongue and the top block abut and engage with each other, and combined with the travel limit of the limit buckle and the limit block, a reliable graded locking and unlocking mechanism is formed. This avoids the problems of premature unlocking or incomplete unlocking, improves the working reliability of the ejection mechanism, reduces component wear, and extends the service life of the mold.

[0014] The overall structure is compact and easy to assemble. The spring assembly provides a stable elastic driving force, and the ejection process is smooth and stable, which further improves production efficiency and product quality stability. Attached Figure Description

[0015] Figure 1 This is a schematic cross-sectional view of the three-stage ejection structure involved in the present invention. Detailed Implementation

[0016] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0017] Please see Figure 1 It should be noted that in the description of this invention, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. These terms are used only for the convenience of describing the invention and for 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. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. The terms "horizontal," "vertical," and "suspended," etc., do not indicate that the component must be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0018] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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 or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0019] Example:

[0020] like Figure 1 As shown, according to an overall technical concept of the present invention, a three-stage ejection structure for use in injection molds is provided, including a first fixed plate 1, a second fixed plate 2, a pillow plate (not shown), a first jump plate 4, a second jump plate 5, a floating plate 6, a guide post assembly 7, a spring assembly 8, a housing 9, and an ejection limiting structure.

[0021] Fixed plate 1 is horizontally fixed, and two pillow plates are symmetrically fixed to the left and right opposite sides of fixed plate 1 by bolts. Their top surfaces are in contact with the bottom surface of fixed plate 2, providing stable support for fixed plate 2. Floating plate 6 is set on fixed plate 1 and located between the two pillow plates, and can move up and down in the vertical direction. There are four guide post assemblies 7, which are vertically fixed at the four corners of the top side of floating plate 6. The guide post assembly 7 includes guide posts and guide sleeves. The guide sleeves are respectively embedded in the corresponding positions of jumping plate 4, jumping plate 5 and fixed plate 2, ensuring that each component slides smoothly along the guide posts. Jumping plate 4, jumping plate 5 and fixed plate 2 are stacked on the guide post assembly 7 from top to bottom. Spring assembly 8 is sleeved on the guide post assembly 7. Its lower end abuts against the top surface of floating plate 6 and its upper end abuts against the bottom surface of fixed plate 2. In its natural state, spring assembly 8 is in a compressed state, providing elastic driving force for the ejection movement.

[0022] The side of the fixing plate 2 is fixed with a housing 9 by bolts. The inner side of the housing 9 has a through slot, the width of which matches the thickness of the top block 61. The inner side of the housing 9 also has vertically arranged guide limiting grooves 91 and 92. Guide limiting groove 91 is located above guide limiting groove 92 and corresponds to the side positions of the first and second springboards 4 and 5, respectively. The length of the guide limiting groove matches the ejection stroke of the corresponding springboard. The right side of the first springboard 4 has an installation groove for elasticity. Locking tongue 41 is inserted into the mounting groove. The outer end of the elastic locking tongue 41 extends out of the mounting groove and slides in the guide limiting groove 91. An elastic element (compression spring) is provided in the mounting groove. One end of the elastic element abuts against the bottom end of the elastic locking tongue 41, and the other end abuts against the bottom of the mounting groove, giving the elastic locking tongue 41 the ability to extend and retract and reset. The right side structure of the second springboard 5 is the same as that of the first springboard 4. The elastic locking tongue 51 slides in the guide limiting groove 92, and its assembly method is the same as that of the elastic locking tongue 41. The top sidewalls of the guide limiting groove 91 and the guide limiting groove 92 are formed into a ramp structure. The top of the elastic locking tongue 41 and the elastic locking tongue 51 are provided with a chamfer structure, which is matched and matched with the ramp structure.

[0023] A top block 61 is fixed to the right side of the floating plate 6 by bolts. The top block 61 extends vertically and is inserted into the slot of the housing 9. The inner side of the top block 61 (the side closest to the floating plate 6) is provided with a horizontal latch 611. The latch 611 is matched with the elastic locking tongue 41 and the elastic locking tongue 51 to achieve the initial locking of the floating plate 6 and the jump plate. A vertically arranged limit buckle 10 is fixed to the right side of the fixed plate 1 by bolts. A limit block 62 is fixed to the right side of the floating plate 6. The limit block 62 is provided with a vertically arranged elongated limit hole. The upper end of the limit buckle 10 is inserted into the limit hole. The length of the limit buckle 10 extending out of the limit hole is adapted to the preset ejection stroke of the floating plate 6 to limit the maximum rising height of the floating plate 6.

[0024] The working process of this embodiment is as follows:

[0025] Upon first ejection, the floating plate 6 overcomes the elastic force of the spring assembly 8 and rises, while the top block 61 rises synchronously, pushing against the bottom side of the ejecting elastic locking tongue 51, which in turn moves the second springboard 5 and the first springboard 4 on it upwards, until the elastic locking tongue 51 reaches the top of the guide limiting groove 92 to unlock. After unlocking, the elastic locking tongue 51 is engaged in the latching groove 611.

[0026] During the second ejection, the top block 61, through the latch groove 611 and in conjunction with the elastic locking tongue 51, drives the second step plate 5 to continue moving upward until the part of the limit buckle 10 extending out of the limit hole abuts against the limit hole. At this time, the top of the top block 61 is lower than the bottom side of the elastic locking tongue 41.

[0027] On the third push-out, the top block 61 pushes against the bottom side of the elastic locking tongue 41, causing the spring plate 4 to move upward until the elastic locking tongue 41 reaches the top of the guide limiting groove 91, thus unlocking. After unlocking, the elastic locking tongue 41 engages in the latching groove 611 and can continue to move upward with the top block 61. During this process, the elastic locking tongue 51 will again abut against the top of the guide limiting groove 92, thus unlocking.

[0028] After ejection is completed, the ejection mechanism resets, and each component returns to its initial state under the action of the reset force, waiting for the next injection cycle.

[0029] This invention addresses the technical shortcomings of existing ejection mechanisms through three-stage ejection, precise guiding and limiting, and reliable locking. It features a reasonable structural design, stable and reliable operation, and is suitable for ejection operations of various complex injection molded parts.

[0030] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A three-ejection structure applied in injection molding, comprising a fixed plate 1, a fixed plate 2, a pillow plate, a jump plate 1, a jump plate 2, a floating plate, a guide post assembly, and a spring assembly. The fixed plate 1 is horizontally arranged, and two pillow plates are fixed to two opposite sides of the fixed plate. The floating plate is disposed on the fixed plate 1 and located between the two pillow plates. The guide post assembly is vertically fixed to the top side of the floating plate. The jump plate 1, the jump plate 2, and the fixed plate 2 are stacked and sleeved on the guide post assembly. The fixed plate 2 is supported by the two pillow plates. The spring assembly is sleeved on the guide post assembly, with one end abutting against the floating plate and the other end abutting against the fixed plate 2. Its characteristics are: A housing is fixed to the side of the fixed plate 2. A through slot is provided on the inner side of the housing. A guide limiting groove 1 corresponding to the first jump plate and a guide limiting groove 2 corresponding to the second jump plate are also provided on the inner side of the housing. An elastic locking tongue 1 is provided on the side of the first jump plate, sliding within the guide limiting groove 1. An elastic locking tongue 2 is provided on the side of the second jump plate, sliding within the guide limiting groove 2. A top block is fixed to the side of the floating plate, inserted into the slot. A buckle groove is provided on the inner side of the top block, matching the elastic locking tongue 1 and the elastic locking tongue 2. A vertically arranged limiting buckle is fixed to the side of the fixed plate 1. A limiting block is fixed to the side of the floating plate, with a limiting hole on the limiting block. The limiting buckle is inserted into the limiting hole.

2. The three-ejection structure applied in injection molds according to claim 1. Its characteristic is: The first and second elastic locking tongues have the same structure, both including a locking tongue body and an elastic element. The sides of the first and second springboards are provided with mounting grooves. The locking tongue body is inserted into the mounting groove and is restricted to move within a certain range along the groove depth. The elastic element is provided in the mounting groove, with one end abutting against the bottom end of the locking tongue body and the other end abutting against the bottom of the mounting groove.

3. The three-ejection structure applied in injection molds according to claim 1. Its characteristic is: The guide post assembly has at least four posts, which are evenly distributed at the four corners of the floating plate.

4. The three-ejection structure applied in injection molds according to claim 2. Its characteristic is: The elastic element is a compression spring.

5. The three-ejection structure applied in injection molds according to claim 2. Its characteristic is: The top sidewalls of the first guide groove and the second guide groove are formed into a ramp structure, and the top of the latch body is provided with a chamfer structure, which is matched and matched with the ramp structure.

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