Anti-sticking ejection mechanism and ejection method

Abstract

The application discloses a kind of anti-sticking ejection mechanism and ejection method, belongs to injection mold technical field, and the ejection mechanism includes first ejection part and second ejection part, the first ejection part and second ejection part synchronous motion;The first ejection part includes several ejector pins, the ejector pin can do linear ejection movement, the second ejection part includes push rod, movable into son and fixedly arranged into guide rail, the movable into son is movably connected into guide rail, the movable into son can move along the direction of movement in into guide rail Groove body, the movable into son is slidably connected with the push rod, and the connecting surface of both is inclined to the ejection direction of the ejector pin;When using, movable into son and ejector pin synchronous ejection movement, during push rod push movable into son rise, while movable into son moves downward relative to push rod, injection workpiece and movable into son are separated in the process of ejection movement, without using secondary parting or using secondary ejection mechanism etc. To avoid sticking mold phenomenon, mold cost can be controlled.

Description

Technical Field

[0001] This application relates to the field of injection mold technology, specifically to an anti-stick ejection mechanism and ejection method. Background Technology

[0002] Plastics play an indispensable role in daily life due to their unique and superior properties, and are widely used in various fields such as automotive, electronics, and medical. Product designs vary depending on their application. Each product is injection molded using a specific mold.

[0003] The common method for ejecting products during mold forming is using ejector pins. However, for products with deep cavities or deep ribs, which involve high clamping forces, simply using ejector pins can easily lead to ejection difficulties, surface bulging, and whitening defects. This is mainly because the product's clamping force is high, and the contact area between the ejector pin and the product is small, resulting in insufficient ejection force. A common improvement strategy is to use an ejector block structure in the mold to eject the product, thereby increasing the ejection area to solve this type of ejection problem (provided that there is enough relatively flat space on the product to accommodate the ejector blocks).

[0004] For some specially shaped products, such as car grilles and audio horns, these products often have a grid-like distribution due to their ventilation function. Their cross-sections are steep and pointed, with short and few flat sections (this characteristic corresponds to the mold where the iron in the corresponding space of the mold core is wrapped by the product's plastic portion, resulting in a strong clamping force after molding). While using ejector blocks, the lack of sufficient relatively flat space in the mold for arranging them causes the ejector blocks themselves to be wrapped in plastic after molding, resulting in secondary sticking. Current mold development uses secondary parting or secondary ejection mechanisms to avoid sticking, which indirectly increases the complexity of the mold mechanism and raises the mold development cost. Summary of the Invention

[0005] The purpose of this application is to provide an anti-stick ejection mechanism and ejection method to solve the defects caused by the prior art.

[0006] To achieve the above objectives, this application employs the following technical solution: In a first aspect, this application discloses an anti-sticking ejection mechanism, which includes a first ejection part and a second ejection part, wherein the first ejection part and the second ejection part eject synchronously; The first ejector portion includes a plurality of ejector pins, which are capable of linear ejection motion. The second ejector part includes a push rod, a movable insert, and a fixed insert guide rail. The movable insert is movably connected to the insert guide rail and can move along the guide groove in the insert guide rail. The movable insert is slidably connected to the push rod, and the connection surface of the two is inclined relative to the ejector pin ejection direction. The guide groove body includes a straight guide groove and an inclined guide groove that are connected to each other. The inclination angle of the inclined guide groove is the same as that of the push rod and the same direction. The straight guide groove is located close to the movable insert.

[0007] In a further embodiment of this application, a base with a first inclined surface is provided between the movable insert and the push rod. The base is fixedly connected to the push rod. A guide block is obliquely installed on the first inclined surface. The movable insert is provided with a second inclined surface, and a sliding groove that matches and slides with the guide block is provided on the second inclined surface.

[0008] A further solution also includes a limiting component, the bottom of which is fixed with a vertical rod, and the base is provided with a limiting groove, so that the limiting component and the base can be matched and installed.

[0009] In a further embodiment of this application, a stop block is provided on the side of the movable insert facing the push rod, and a limiting groove is provided on the base. The push rod drives the movable insert, and the push rod and the movable insert move relative to each other. The stop block moves to contact the limiting groove.

[0010] A further embodiment of this application includes an ejector plate, wherein the push rod is inclined relative to the surface of the ejector plate, a slide is fixed on the ejector plate, and the push rod is slidably connected to the slide.

[0011] In a further embodiment of this application, the top surface of the active insert matches the surface shape of the injection molded workpiece.

[0012] In a further embodiment of this application, there are multiple second ejector portions, which are symmetrically arranged along the midpoint of the surface shape of the injection molded workpiece.

[0013] Secondly, this application also discloses an ejection method based on the aforementioned anti-stick ejection mechanism, comprising: In the initial stage, the first ejector and the second ejector simultaneously contact the injection molded workpiece and eject the injection molded workpiece from the cavity; The movable insert rises in the straight guide groove, and the movable insert moves downward relative to the inclined bar. The movable insert is then separated from the injection molded workpiece, and at the same time, the top pin supports the injection molded workpiece. The movable insert switches to the inclined guide groove and rises. The movable insert moves along the inclined guide groove, and the ejector pin lifts the injection molded workpiece to the target position.

[0014] The beneficial effects of this application are as follows: When this application is used, the movable insert and the ejector pin move synchronously. During this process, the push rod pushes the movable insert upward, and because the contact surfaces of the two are inclined, the movable insert moves downward relative to the push rod. During the ejection process, the injection molded workpiece and the movable insert are separated. There is no need to use secondary parting or secondary ejection mechanisms to avoid sticking to the mold. This structure can separate the injection molded workpiece in one ejection movement. The structure is simple and can control the mold cost. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view of the mold in the embodiments of this application; Figure 2 For this application Figure 1 Enlarged view of the part of the active insert that is pushed out; Figure 3 This is a structural schematic diagram of the connecting body such as the movable insert and push rod in this application; Figure 4 For this application Figure 3 Exploded view of the intermediate connecting body.

[0016] The components are: 1. Movable insert; 2. Base; 21. Limiting slot; 3. Guide block; 4. Stop block; 5. Push rod; 6. Insert guide rail; 61. Straight guide groove; 62. Inclined guide groove; 7. Guide pin; 8. Slide block; 9. Cooling adapter block; 10. Limiting component; 11. Ejector pin; 12. Male mold; 13. Ejector plate; 15. Base; 100. Injection molded part. Detailed Implementation

[0017] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use. Example 1

[0018] like Figure 1 and Figure 2 As shown, this application discloses an anti-stick ejection mechanism, which includes a first ejection part and a second ejection part, and the first ejection part and the second ejection part eject synchronously; the first ejection part includes a plurality of ejector pins 11, and the ejector pins 11 can perform linear ejection motion; the second ejection part includes a push rod 5, a movable insert 1 and a fixed insert guide rail 6, the movable insert 1 is movably connected to the insert guide rail 6, and during manufacturing, a guide pin 7 is fixed on one side of the movable insert 1, the guide pin 7 moves in the insert guide rail 6, the movable insert 1 can move along the guide groove in the insert guide rail 6, the movable insert 1 is slidably connected to the push rod 5, and the connection surface of the two is inclined relative to the ejection direction of the ejector pins 11; The guide channel body includes a straight guide channel 61 and an inclined guide channel 62 connected to each other. The inclination angle of the inclined guide channel 62 is the same as that of the push rod 5 and the same orientation. The straight guide channel 61 is set close to the movable insert 1, and the inclined guide channel 62 is set on the top of the straight guide channel 61.

[0019] In use, the ejector pin 11 and the push rod 5 move upward together. During this process, the push rod 5 and the movable insert 1 are arranged at an angle to each other. The movable insert 1 is limited by the insert guide rail 6. While the push rod 5 presses the movable insert 1 to lift it up, the movable insert 1 moves downward relative to the push rod 5. At the same time, the ejector pin 11 contacts the injection molded workpiece 100 in real time, completing the separation of the injection molded workpiece 100 and the movable insert 1.

[0020] As attached Figure 3 and Figure 4 As shown, in this embodiment, the top of the movable insert 1 is fixed with a base 2 having a first inclined surface. A guide block 3 is installed obliquely on the first inclined surface. The movable insert 1 has a second inclined surface. The two inclined surfaces match and fit together. The second inclined surface has a sliding groove that matches and slides with the guide block 3. In this embodiment, two guide blocks 3 are set. The two guide blocks 3 are set at intervals on the first inclined surface of the base 2, and the corresponding sliding grooves are set accordingly. This can improve the pushing stability of the push rod 5. In this embodiment, the cross-section of the guide block 3 is T-shaped, which is used in conjunction with the T-shaped groove on the second inclined surface.

[0021] In this embodiment, a limiting member 10 is also provided. A vertical rod is fixed to the bottom of the limiting member 10, and a limiting groove is provided on the base 2. The limiting member 10 and the base 2 can be matched and installed. The vertical rod is connected to the driving device. During the movement of the push rod 5 following the driving device, the limiting groove and the limiting member 10 slide relative to each other, which improves the overall ejection stability of the mechanism. It should be noted that this design can be omitted when using it for ejecting injection molded workpieces 100 with smaller weight.

[0022] In this embodiment, a stop block 4 is provided on the side of the movable insert 1 facing the push rod 5. The push rod 5 drives the movable insert 1, and the push rod 5 and the movable insert 1 move relative to each other. The stop block 4 moves to contact the limiting slot 21 on the base 2, which limits the extreme position of the relative movement of the movable insert 1 and the base 2.

[0023] In this embodiment, an ejector plate 13 is also provided, and the push rod 5 is inclined relative to the surface of the ejector plate 13. A slide block 8 is fixed on the ejector plate 13, and the push rod 5 is slidably connected to the slide block 8, which facilitates the implementation of the mechanism on the mold.

[0024] In a further embodiment, there are multiple second ejector portions, which are symmetrically arranged along the midpoint of the surface shape of the injection molded workpiece 100 to improve the stability of the injection molded workpiece 100 during lifting. In addition, a cooling adapter block 9 is fixed on one side of the movable insert 1 to connect to an external cooling circulation system, thereby accelerating the cooling and molding of the injection molded workpiece 100.

[0025] After the injection molded workpiece 100 is formed, in the initial stage, the first ejector and the second ejector synchronously contact the injection molded workpiece 100 and eject the injection molded workpiece 100 from the cavity; the movable insert 1 rises in the straight guide groove 61, but the movable insert 1 moves downward relative to the inclined rod, and the movable insert 1 disengages from the injection molded workpiece 100. At the same time, the ejector pin 11 supports the injection molded workpiece 100; the movable insert 1 switches to the inclined guide groove 62 and rises. The movable insert 1 moves along the inclined guide groove 62, and the ejector pin 11 lifts the injection molded workpiece 100 to the target position. Example 2

[0026] This application also provides an injection mold, which includes a base 15, an ejector plate 13, and a male mold 12; the male mold 12 and the base 15 are fixed, the ejector plate 13 is connected to a hydraulic or pneumatic device for lifting and lowering, during installation, the ejector surface of the movable insert 1 matches the surface shape of the injection molded workpiece 100, the surface of the movable insert 1 is also part of the cavity, the guide pin on the movable insert 1 is arranged in the guide groove of the insert guide rail 6, the slide 8 is fixed on the ejector plate 13, the inclined rod passes through the through hole on the male mold 12 to fix and connect the base 2, and a number of ejector pins 11 are vertically fixed on the ejector plate 13.

[0027] The anti-stick ejection mechanism will be explained in detail below in conjunction with production; The push rod 5 of the injection molding machine pushes the ejector plate 13 to drive the ejector pin 11 and the movable insert 1 to perform an ejection motion synchronously. Within the straight guide groove 61, the movable insert 1 moves upward under the pressure of the push rod 5, and at the same time, the movable insert 1 moves downward relative to the base 2. At this time, the ejector pin 11 still supports the injection molded workpiece 100, thus realizing the separation of the injection molded workpiece 100 from the movable insert 1. Within the inclined guide groove 62, when the mid-range movable insert 1 reaches the end of the straight guide groove 61, the guide block 3 and the movable insert 1 move relative to each other, and the stop block 4 moves to contact the limiting slot 21 on the base 2. Since the inclination angle of the inclined surface on the inclined guide groove 62 is the same as the inclination angle of the push rod 5, the movable insert 1 continues to move along the inclined guide groove 62. During this process, the separation distance between the movable insert 1 and the product is increased until the target position is reached. The specific position is determined to facilitate the final product removal by the robot or manual.

[0028] It should be noted that in actual manufacturing, the lengths of the straight guide groove 61 and the inclined guide groove 62 need to be matched with the contact tilt angle of the movable insert 1 and the base 2. When designing the parameters, multiple simulations are performed to make adaptive adjustments.

[0029] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used 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 a limitation on this application. Furthermore, the terms "first," "second," etc., 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," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0030] 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 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 connection between two components. Those skilled in the art will understand the specific meaning of the above terms in this application based on the specific circumstances.

Claims

1. An anti-stick ejection mechanism, characterized in that, It includes a first ejector section and a second ejector section, and the first ejector section and the second ejector section perform synchronous ejection movements; The first ejector portion includes a plurality of ejector pins, which are capable of linear ejection. The second ejector part includes a push rod, a movable insert, and a fixed insert guide rail. The movable insert is movably connected to the insert guide rail and can move along the guide groove in the insert guide rail. The movable insert is slidably connected to the push rod, and the connection surface of the two is inclined relative to the ejector pin ejection direction. The guide groove body includes a straight guide groove and an inclined guide groove that are connected to each other. The inclination angle of the inclined guide groove is the same as the inclination degree and orientation of the push rod. The straight guide groove is located close to the movable insert.

2. The anti-stick ejection mechanism according to claim 1, characterized in that, A base with a first inclined surface is provided between the movable insert and the push rod. The base is fixedly connected to the push rod. A guide block is installed at an inclination on the first inclined surface. The movable insert is provided with a second inclined surface, and a sliding groove that matches and slides with the guide block is provided on the second inclined surface.

3. The anti-stick ejection mechanism according to claim 2, characterized in that, It also includes a limiting component, the bottom of which is fixed with a vertical rod, and the base is provided with a limiting groove, and the limiting component and the base can be matched and installed.

4. The anti-stick ejection mechanism according to claim 2, characterized in that, The movable insert has a stop block on the side facing the push rod, and the base has a limiting slot. The push rod drives the movable insert, and the push rod and the movable insert move relative to each other. The stop block moves to contact the limiting slot.

5. The anti-stick ejection mechanism according to claim 1, characterized in that, It also includes an ejector plate, the push rod is inclined relative to the surface of the ejector plate, a slide is fixed on the ejector plate, and the push rod is slidably connected to the slide.

6. The anti-stick ejection mechanism according to claim 1, characterized in that, The top surface of the movable insert matches the surface shape of the injection molded workpiece.

7. The anti-stick ejection mechanism according to claim 1, characterized in that, There are multiple second ejector portions, and the multiple second ejector portions are symmetrically arranged along the midpoint of the surface shape of the injection molded workpiece.

8. An ejection method implemented by the anti-stick ejection mechanism according to any one of claims 1 to 7, characterized in that, include: In the initial stage, the first ejector and the second ejector contact the injection molded workpiece simultaneously, ejecting the injection molded workpiece from the cavity; The movable insert rises in the straight guide groove, and the movable insert moves downward relative to the inclined bar. The movable insert is then separated from the injection molded workpiece, and at the same time, the top pin supports the injection molded workpiece. The movable insert switches to the inclined guide groove and rises. The movable insert moves along the inclined guide groove, and the ejector pin lifts the injection molded workpiece to the target position.

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