A demolding mechanism

Abstract

This invention provides a demolding mechanism, comprising: a fixed mold, a moving mold, and an ejector plate. The fixed mold has a fixed mold core, and the moving mold has a moving mold core. Cavities are provided corresponding to the fixed and moving mold cores. An inclined ejector and a slider are provided within the cavity. The lower end of the inclined ejector abuts against the ejector plate, and the upper end of the inclined ejector is located within the cavity. The slider is positioned on one side of the moving mold, with its front end embedded in the cavity and positioned below the head of the inclined ejector. Symmetrical arc-shaped bosses are provided on both sides of the middle portion of the slider, and a circular shaft boss extending to both sides is provided at the tail end of the slider. The mechanism also includes guide blocks adapted to the two arc-shaped bosses. Each guide block has an arc-shaped guide groove adapted to the arc-shaped boss on its side near the slider. A push rod is provided between the bottom of the guide block and the ejector plate. A stepped groove adapted to the circular shaft boss on the guide block positioning plate is provided. The mechanism has a simple structure and facilitates demolding of products with undercuts in the side-pull demolding direction.

Description

Technical Field

[0001] This invention relates to the field of mold technology, and more particularly to a demolding mechanism. Background Technology

[0002] In injection molding, complex products such as rearview mirrors and lamp housings often have multiple undercuts, requiring core-pulling mechanisms to achieve functional requirements. However, many complex undercuts, especially those with additional undercuts in the side-pulling demolding direction, cannot be accommodated by conventional side-pulling mechanisms. This often necessitates modifying the product structure, or even splitting a single product into two, which reduces functionality and increases costs. Therefore, resolving issues involving multiple undercuts in different directions, including those with additional undercuts in the side-pulling demolding direction, presents a significant technical challenge and key to improving product functionality and reducing costs. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides a demolding mechanism. The demolding mechanism provided by this invention has a simple structure and facilitates demolding and core pulling of products with undercuts in the side-pull demolding direction.

[0004] The technical means employed in this invention are as follows: A demolding mechanism includes: a fixed mold, a moving mold, and an ejector plate arranged sequentially from top to bottom. The fixed mold has a fixed mold core, and the moving mold has a moving mold core. A cavity is formed corresponding to the fixed mold core and the moving mold core. An inclined ejector and a slider are disposed within the cavity. The lower end of the inclined ejector abuts against the ejector plate, and the upper head of the inclined ejector is located within the cavity. The slider is disposed on one side of the moving mold, with its front end embedded within the cavity and positioned below the head of the inclined ejector. The moving mold core, the head of the inclined ejector, and the slider together form a product cavity. The front end of the slider is recessed... The surface and the corresponding inclined head form an inverted structure. The middle part of the slider is symmetrically provided with arc bosses on both sides. The tail end of the slider is provided with a circular shaft boss extending to both sides. It also includes guide blocks that are adapted to the two arc bosses. Each guide block has an arc guide groove adapted to the arc boss on the side near the slider. The guide block is positioned on the moving mold by a guide block positioning plate. A push rod is provided between the bottom of the guide block and the ejector plate. The guide block positioning plate has a stepped groove adapted to the circular shaft boss on the slider. The circular shaft boss is limited in the stepped groove by a pressure strip.

[0005] Furthermore, the upper end of the push rod is fixedly connected to the guide block by a first bolt, and the lower end of the push rod is fixedly connected to the top rod plate by a second bolt.

[0006] Furthermore, the moving mold core is provided with an inclined top groove that is adapted to the inclined top.

[0007] Furthermore, the moving mold core is provided with a positioning groove that matches the front end of the slider.

[0008] Furthermore, the guide block positioning plate is provided with a vertical sliding groove that is adapted to the guide block.

[0009] Furthermore, the pressure strip is fixed to the step of the stepped groove by a third bolt.

[0010] The present invention has the following advantages: This invention provides a demolding mechanism, comprising: a fixed mold, a moving mold, and an ejector plate arranged sequentially from top to bottom. The fixed mold has a fixed mold core, and the moving mold has a moving mold core. A cavity is formed corresponding to the fixed mold core and the moving mold core. An inclined ejector and a slider are disposed within the cavity. The lower end of the inclined ejector abuts against the ejector plate, and the upper head of the inclined ejector is located within the cavity. The slider is disposed on one side of the moving mold, with its front end embedded within the cavity and positioned below the head of the inclined ejector. The moving mold core, the head of the inclined ejector, and the slider together form the product cavity. The front concave surface and the corresponding sloping top head form an inverted structure. The middle part of the slider is symmetrically provided with arc bosses on both sides. The tail end of the slider is provided with a circular shaft boss extending to both sides. It also includes guide blocks that are adapted to the two arc bosses. Each guide block has an arc guide groove adapted to the arc boss on the side near the slider. The guide block is positioned on the moving mold by a guide block positioning plate. A push rod is provided between the bottom of the guide block and the push rod plate. The guide block positioning plate has a stepped groove adapted to the circular shaft boss on the slider. The circular shaft boss is limited in the stepped groove by a pressure strip. It adopts a circular arc guide groove and circular shaft sliding positioning structure. The ejector plate drives the push rod, so that the guide block fixed on the push rod moves along the guide groove of the fixed block in the product ejection direction. The slider has a circular arc boss that fits perfectly with the circular arc guide groove. As the guide block is ejected, the front end of the slider tilts up in the product ejection direction under the action of the radial pressure plate at the circular shaft boss. The slider also slides towards the center of the mold as it is ejected, so that the slider can tilt up with the circular arc guide groove of the guide block until the undercut does not affect the product ejection. Its structure is simple and facilitates the demolding and core pulling of products with undercuts in the side demolding direction. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the mold-closing structure according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the mold opening structure according to an embodiment of the present invention; Figure 3 This is a top view of the structure according to an embodiment of the present invention; Figure 4 This is a three-dimensional structural diagram of an embodiment of the present invention; Figure 5 This is a schematic diagram of the three-dimensional structure of the slider according to an embodiment of the present invention.

[0013] In the diagram: 1. Fixed mold, 2. Moving mold, 3. Ejector plate, 4. Fixed mold core, 5. Moving mold core, 6. Angled ejector, 7. Slider, 8. Arc boss, 9. Circular shaft boss, 10. Guide block, 11. Arc guide groove, 12. Guide block positioning plate, 13. Push rod, 14. Pressure strip, 15. First bolt, 16. Second bolt, 17. Third bolt. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0015] like Figure 1-5 As shown, a demolding mechanism includes: a fixed mold 1, a moving mold 2, and an ejector plate 3 arranged sequentially from top to bottom. The fixed mold 1 is provided with a fixed mold core 4, and the moving mold 2 is provided with a moving mold core 5. The fixed mold core 4 and the moving mold core 5 are provided with cavities corresponding to each other. An inclined ejector 6 and a slider 7 are provided in the cavity. The lower end of the inclined ejector 6 abuts against the ejector plate 3, and the upper end of the inclined ejector 6 is located in the cavity. An inclined ejector groove adapted to the inclined ejector 6 is opened on the moving mold core 5.

[0016] The slider 7 is slidably disposed on one side of the moving mold 2. The front end of the slider 7 is embedded in the cavity and positioned below the head of the inclined ejector 6. The moving mold core 5, the head of the inclined ejector 6, and the slider 7 together form the product cavity. The concave surface of the front end of the slider 7 and the corresponding head of the inclined ejector 6 form an undercut structure. The moving mold core 5 is provided with a positioning groove that matches the front end of the slider 7. The cross-section of the undercut structure in this embodiment is approximately S-shaped. Circular arc bosses 8 are symmetrically arranged on both sides of the middle part of the slider 7, and circular shaft bosses 9 extending to both sides are provided at the tail end of the slider 7.

[0017] To facilitate the movement of the slider 7, this embodiment also includes guide blocks 10 that are adapted to the two arc-shaped bosses 8. Each guide block 10 has an arc-shaped guide groove 11 adapted to the arc-shaped bosses 8 on the side near the slider 7. The arc-shaped bosses 8 can slide in the arc-shaped guide groove 11. The guide blocks 10 are positioned on the moving mold 2 by the guide block positioning plate 12. The guide block positioning plate 12 has a vertical sliding groove adapted to the guide blocks 10. The guide blocks can slide in the vertical sliding groove. A push rod 13 is provided between the bottom of the guide blocks 10 and the top rod plate 3. The guide block positioning plate 12 has a stepped groove adapted to the round shaft bosses 9 on the slider 7. The round shaft bosses 9 are limited in the stepped groove by the pressure strip 14.

[0018] Specifically, for ease of installation and disassembly, the upper end of the push rod 13 is fixedly connected to the guide block 10 by a first bolt 15. The threaded section of the first bolt passes through the through hole on the guide block and is threaded into the threaded hole at the top of the push rod. The lower end of the push rod 13 is fixedly connected to the top rod plate 3 by a second bolt 16. The threaded section of the second bolt passes through the through hole on the top rod plate and is threaded into the threaded hole at the bottom of the push rod. The pressure strip 14 is fixed to the step of the stepped groove by a third bolt 17. The threaded section of the third bolt passes through the through hole on the pressure plate and is threaded into the threaded hole on the step surface of the stepped groove.

[0019] The arc guide groove 11 on the guide block 10 matches the arc boss 8 on the slider 7, which is used to drive the slider 7 to rotate and move. The slider 7 is pressed on the round shaft boss 9 at the tail end of the slider 7 by the pressure strip 14, so that the tail end of the slider 7 is fixed on the guide block positioning plate 12. The front end of the slider 7 is embedded in the moving mold core 5. The guide block 10 is embedded in the groove of the guide block positioning plate 12, so that the guide block 10 can only move up and down. The inclined ejector 6 is installed in the inclined ejector groove of the moving mold core 5, so that the inclined ejector 6 can only move in the direction of the inclined ejector groove. The fixed mold core 4 presses on the slider 7, so that the slider 7 cannot move when the mold is closed.

[0020] During mold opening, the fixed mold core 4 opens, while the angled ejector 6 and push rod 13 move upward with the ejector plate 3. The guide block 10 moves upward under the action of the push rod 13. The arc guide groove 11 on the guide block 10 drives the front end of the slider 7 upward, while the rear end of the slider 7 only moves laterally under the pressure of the pressure strip 14. This ensures that the arc boss 8 on the slider 7 always engages with the arc guide groove 11 of the guide block 10, allowing the slider 7 to continue moving upward with the guide block 10 until the slider 7 no longer affects the product ejection. In this embodiment, for multi-point products using cold runners, there is no need to process the runner on upper and lower machine tools to balance and fill the product, which is convenient for subsequent production, saves time, and is quick and convenient.

[0021] It should be noted that the parts of this invention not described in detail are prior art.

[0022] In the description of this invention, 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," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention 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. Therefore, they should not be construed as limitations on this invention.

[0023] Furthermore, 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0024] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "joining," "fixing," and "screw-in" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is 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 can mean that the first feature is 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.

[0026] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0027] In the description of this invention, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A demolding mechanism, characterized in that: include: The mold consists of a fixed mold, a moving mold, and an ejector plate arranged sequentially from top to bottom. The fixed mold has a fixed mold core, and the moving mold has a moving mold core. Corresponding to the moving mold cores are cavities. An inclined ejector and a slider are disposed within the cavity. The lower end of the inclined ejector abuts against the ejector plate, and the upper end of the inclined ejector is located within the cavity. The slider is disposed on one side of the moving mold, with its front end embedded within the cavity and positioned below the head of the inclined ejector. The moving mold core, the head of the inclined ejector, and the slider together form the product cavity. A recessed area at the front end of the slider and the corresponding head of the inclined ejector form a... The inverted structure has symmetrically arranged arc-shaped bosses on both sides of the middle part of the slider, and a circular shaft boss extending to both sides at the tail end of the slider. It also includes guide blocks that are adapted to the two arc-shaped bosses. Each guide block has an arc-shaped guide groove adapted to the arc-shaped boss on the side near the slider. The guide block is positioned on the moving mold by a guide block positioning plate. A push rod is arranged between the bottom of the guide block and the push rod plate. The guide block positioning plate has a stepped groove adapted to the circular shaft boss on the slider. The circular shaft boss is limited in the stepped groove by a pressure strip. The cross-section of the inverted structure is approximately S-shaped.

2. The demolding mechanism according to claim 1, characterized in that: The upper end of the push rod is fixedly connected to the guide block by the first bolt, and the lower end of the push rod is fixedly connected to the top rod plate by the second bolt.

3. The demolding mechanism according to claim 1, characterized in that: The moving mold core is provided with an inclined top groove that is adapted to the inclined top.

4. The demolding mechanism according to claim 1, characterized in that: The moving mold core is provided with a positioning groove that matches the front end of the slider.

5. A demolding mechanism according to claim 1, characterized in that: The guide block positioning plate is provided with a vertical sliding groove adapted to the guide block.

6. The demolding mechanism according to claim 1, characterized in that: The pressure strip is fixed to the step of the stepped groove by a third bolt.

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