Secondary stripper mechanism

Abstract

The application is a secondary ejection mechanism, which comprises a secondary ejection plate, a straight ejector pin and a cylinder fixed in the secondary ejection plate and extending through a lower die core to a horn runner, an inner ejector pin movably arranged in the cylinder, the side of the ejector pin close to the horn runner extending to a reverse buckle in the horn runner, and the other side of the ejector pin extending to the primary ejection plate, a shifting lever rotatably connected between the secondary ejection plate and the primary ejection plate through a rotating member, a stopper fixed to the side of a die foot close to the secondary ejection plate, one end of the shifting lever located at the side of the stopper away from a lower die plate, and the other end of the shifting lever in contact with the secondary ejection plate. The application has the advantages that the application generates less waste compared with the background mechanism one, and has high stability compared with the background mechanism two, so that the application not only achieves the purpose of saving material and reduces the production cost of products, but also has the secondary ejection function to prevent the ejection member from clamping the product and causing the product to be difficult to take out.

Description

[Technical Field]

[0001] This invention relates to the field of mold mechanism technology, and in particular to a secondary stripping head mechanism. [Background Technology]

[0002] Horn-shaped injection is a common injection method in plastic molds. It's typically used to address the issue of the horn-shaped runner being unable to be pulled out of the mold core due to deformation and sticking forces at the horn end during ejection, thus preventing ejection. Two mechanisms are usually employed:

[0003] Firstly, as Figure 1 The diagram shows the first ejector pin 20 and the second ejector pin 30. However, when the first ejector pin 20 and the second ejector pin 30 eject the horn-shaped runner 40, the first waste material 21 and the second waste material 31 are respectively provided on the contact side of the first ejector pin 20 and the second ejector pin 30 with the horn-shaped runner 40. This is used to increase the gravity balance of the deformation tension and sticking force at the end of the horn-shaped runner 40, and to prevent the horn-shaped runner 40 from tilting towards the horn end due to the deformation tension and sticking force. The side of the first ejector pin 20 that contacts the first waste material 21 is provided with a protrusion 22. The protrusion 22 is used to position the horn-shaped runner 40 and prevent the horn-shaped runner 40 from falling or flying away after being ejected. However, the first waste material 21 and the second waste material 31 generated by this mechanism will lead to high production costs of the product.

[0004] Second, as Figure 2 As shown, a false flow channel 60 is provided at the other end of the horn flow channel 40. Although the waste generated by the false flow channel 60 is less, the stability of the third ejector pin 70 when it pushes out of the horn flow channel 40 is poor. Furthermore, when the horn flow channel 40 is longer, the waste generated at the other end corresponding to the false flow channel 60 will be more.

[0005] In view of this, it is necessary to provide a secondary stripping head mechanism to solve the above problems. [Summary of the Invention]

[0006] The technical problem this invention aims to solve is: When ejecting the horn-shaped runner, the deformation tension and sticking force tilt inwards towards the horn end, preventing the runner from being pulled out of the mold core's flow channel and thus hindering ejection. Two common mechanisms are used: one is a double ejector pin system, but this generates waste, leading to high production costs; the other is a dummy runner at the other end of the horn runner, which generates less waste but has poor stability, and when the horn runner is long, the corresponding dummy runner at the other end generates more waste. This invention provides a secondary ejector head mechanism to solve the above problems.

[0007] The solution to the technical problem of this invention is: a secondary stripping head mechanism, comprising a mold foot fixedly connected to a lower fixed plate, a lower template fixedly connected to the mold foot, a lower mold core provided inside the lower template, a horn-shaped flow channel provided inside the lower mold core, and a primary ejector plate movable between the lower fixed plate and the lower template via a power device; wherein...

[0008] The secondary ejector plate is movably located on the side of the primary ejector plate near the lower mold plate. A straight ejector pin and an ejector sleeve are fixedly connected inside the secondary ejector plate. Both the straight ejector pin and the ejector sleeve extend through the lower mold plate to connect with the horn-shaped flow channel inside the lower mold core. An inner ejector pin is movably located inside the ejector sleeve. The side of the inner ejector pin near the horn-shaped flow channel extends into the horn-shaped flow channel and has an undercut. The other side of the inner ejector pin extends to be fixedly connected to the primary ejector plate.

[0009] The lever is rotatably connected between the secondary ejector plate and the primary ejector plate via a rotating component. The rotating component is fixedly connected to the primary ejector plate. A stop block is fixedly connected to the side of the mold foot closest to the secondary ejector plate. One end of the lever is located on the side of the stop block away from the lower mold plate, and the other end is in contact with the secondary ejector plate. It is used so that one end is limited by the stop block, and the other end rotates along the rotating component, thereby prying the secondary ejector plate to move relative to the primary ejector plate.

[0010] Preferably, the contact area between the undercut of the inner ejector pin and the horn-shaped flow channel is larger than the contact area with the inner ejector pin itself, so as to enhance the stability of the connection between the inner ejector pin and the horn-shaped flow channel through the clamping force of the horn-shaped flow channel on the undercut.

[0011] Preferably, an ejector rod is fixedly connected inside the primary ejector plate for ejecting the product at the primary stage. A flat top is fixedly connected inside the secondary ejector plate for ejecting the product at the secondary stage. This prevents the material head from damaging the product after the primary ejection and prevents the ejector from clamping the product, thus making it difficult to remove the product.

[0012] Preferably, a return pin is fixedly connected to the side of the secondary ejector plate near the lower template. The return pin is fitted with an elastic element for returning the secondary ejector plate to its original position relative to the primary ejector plate. The elastic element includes, but is not limited to, a spring.

[0013] Preferably, a wear-resistant plate is fixedly connected to the side of the secondary ejector plate that contacts the lever, in order to reduce wear when the lever acts on the movement of the secondary ejector plate.

[0014] Preferably, the straight ejector pin and the ejector sleeve are fixedly connected to the secondary ejector plate by a fixing block for easy assembly.

[0015] Preferably, the rotating component includes, but is not limited to, a rotating pin.

[0016] The beneficial effects of this invention are as follows: This invention provides a secondary ejector head mechanism, which includes a secondary ejector plate movable on the side of the primary ejector plate near the lower mold plate. A straight ejector pin and a sleeve are fixedly connected inside the secondary ejector plate. Both the straight ejector pin and the sleeve extend through the lower mold plate to connect with the horn-shaped flow channel. An inner ejector pin is movably installed inside the sleeve. The side of the inner ejector pin near the horn-shaped flow channel extends into the flow channel and has an undercut. The other side of the inner ejector pin extends to be fixedly connected to the primary ejector plate. A lever is rotatably connected between the secondary ejector plate and the primary ejector plate via a rotating component. The rotating component is fixedly connected to the primary ejector plate. A stop block is fixedly connected to the mold foot near the secondary ejector plate, and one end of the lever is located at the stop block. One end is away from the lower template, and the other end contacts the secondary ejector plate. This allows one end to be limited by the stop block, while the other end rotates along the rotating part, thereby prying the secondary ejector plate to move relative to the primary ejector plate. This invention uses a mechanism in which both the straight ejector pin and the ejector sleeve extend through the lower template to connect with the horn-shaped flow channel. The inner ejector pin in the ejector sleeve extends into the horn-shaped flow channel on the side closest to it and has an undercut. Compared to the first background mechanism, it produces less waste, and compared to the second background mechanism, it has higher stability. Thus, this invention not only achieves the purpose of saving materials and reducing the production cost of the product, but also has a secondary ejection function to prevent the ejector from clamping the product, making the product difficult to remove. Therefore, it has high stability. [Attached Image Description]

[0017] Figure 1 This is a schematic diagram of a known top-feeding head mechanism.

[0018] Figure 2 This is a partial structural diagram of another known top-feeding head mechanism.

[0019] Figure 3 This is a schematic diagram of the structure of the secondary stripping head mechanism before ejection according to the present invention.

[0020] Figure 4 yes Figure 3 Cross-sectional view of AA.

[0021] Figure 5 yes Figure 4 A magnified view of C.

[0022] Figure 6 yes Figure 3 Cross-sectional view of BB in the middle.

[0023] Figure 7 This is a schematic diagram of the structure of the secondary stripping head mechanism after it is ejected according to the present invention.

[0024] Figure 8 yes Figure 7 Cross-sectional view of DD.

[0025] Figure 9 yes Figure 8 Enlarged view of F in the middle.

[0026] Figure 10 yes Figure 7 Cross-sectional view of EE.

Detailed Implementation Methods

[0027] To further illustrate the technical means and effects of the present invention, the following detailed description is provided in conjunction with the embodiments of the present invention and their accompanying drawings.

[0028] This invention provides a secondary stripping head mechanism, comprising a lower fixed plate 110 with a mold foot 120 fixedly connected thereto, a lower template 130 fixedly connected to the mold foot 120, a lower mold core 140 disposed within the lower template 130, a horn-shaped flow channel 40 disposed within the lower mold core 140, and a primary ejector plate 200 movable between the lower fixed plate 110 and the lower template 130 via a power device (not shown in the figure); wherein,

[0029] A secondary ejector plate 300 is movably disposed on the side of the primary ejector plate 200 near the lower mold plate 130. A straight ejector pin 310 and an ejector sleeve 320 are fixedly connected inside the secondary ejector plate 300. Both the straight ejector pin 310 and the ejector sleeve 320 extend through the lower mold plate 130 to communicate with the horn-shaped flow channel 40 inside the lower mold core 140. An inner ejector pin 330 is movably disposed inside the ejector sleeve 320. The side of the inner ejector pin 330 near the horn-shaped flow channel 40 extends to the horn-shaped flow channel 40 and has an undercut 340. The other side of the inner ejector pin 330 extends to be fixedly connected to the primary ejector plate 200.

[0030] A lever 400 is rotatably connected between the secondary ejector plate 300 and the primary ejector plate 200 via a rotating component 410. The rotating component 410 is fixedly connected to the primary ejector plate 200. A stop block 420 is fixedly connected to the side of the mold foot 120 near the secondary ejector plate 300. One end of the lever 400 is located on the side of the stop block 420 away from the lower mold plate 130, and the other end is in contact with the secondary ejector plate 300. This allows the other end to rotate along the rotating component 410 under the limiting action of the stop block 420, thereby prying the secondary ejector plate 300 to move relative to the primary ejector plate 200.

[0031] In this case, the contact area between the inverted clip 340 of the inner ejector pin 330 and the horn-shaped flow channel 40 is larger than the contact area with the inner ejector pin 330 itself. (See reference...) Figure 5 and Figure 9 The inverted buckle 340 can be set as a tapered inverted buckle, which is used to tighten the inverted buckle 340 through the horn flow channel 40, thereby enhancing the stability of the connection between the inner ejector pin 330 and the horn flow channel 40.

[0032] The primary ejector plate 200 is fixedly connected to an ejector rod (not shown in the figure), which is used to eject the product 60 for the first time. The secondary ejector plate 300 is fixedly connected to a flat top 210, which is used to eject the product 60 for the second time. This prevents the material head from damaging the product 60 after the product 60 is ejected for the first time, and also prevents the ejector (not shown in the figure) from clamping the product 60, which would make it difficult to remove the product 60.

[0033] Among them, the secondary ejector plate 300 is fixedly connected to the return pin 350 on the side near the lower template 130. The return pin 350 is wrapped with an elastic element 360 for returning the secondary ejector plate 300 and the primary ejector plate 200. The elastic element 360 includes, but is not limited to, a spring.

[0034] Among them, a wear-resistant plate 430 is fixedly connected to the side of the secondary ejector plate 300 that contacts the lever 400, in order to reduce the wear of the lever 400 when it acts on the movement of the secondary ejector plate 300.

[0035] The straight ejector pin 310 and the ejector sleeve 320 are fixedly connected to the secondary ejector plate 300 by the fixing block 370 for easy assembly.

[0036] The rotating component 410 includes, but is not limited to, a rotating pin.

[0037] The working process of this invention is as follows:

[0038] When the product 60 is ejected after the mold opens, the primary ejector plate 200, under the action of the power device (not shown in the figure), drives the secondary ejector plate 300 to move towards the end of the product 60, causing the ejector rod (not shown in the figure) in the primary ejector plate 200 and the flat ejector 210 in the secondary ejector plate 300 to eject the product 60, and the inner ejector pin 330 in the primary ejector plate 200 and the straight ejector pin 310 and ejector sleeve 320 to eject the horn-shaped flow channel 40. When the lever 400 moves to the stop block 420, the power unit (not shown in the figure) continues to act on the primary ejector plate 200 and the secondary ejector plate 300 to move towards the product 60 end. At this time, the lever 400 rotates along the rotating member 410 under the action of the stop block 420, thereby prying the secondary ejector plate 300 away from the primary ejector plate 200, causing the ejector sleeve 320 in the secondary ejector plate 300 to move relative to the inner ejector pin 330, thereby forcibly disengaging the buckle 340 of the inner ejector pin 330 from the horn flow channel 40.

[0039] When the mold is closed, the ejector rod (not shown in the figure), the flat ejector 210, the straight ejector pin 310 and the inner ejector pin 330 return to their original positions under the action of the elastic element 360.

[0040] The beneficial effects of this invention are as follows: This invention utilizes a secondary ejector head mechanism, which includes a secondary ejector plate 300 movably positioned on the side of the primary ejector plate 200 near the lower template 130. A straight ejector pin 310 and a sleeve 320 are fixedly connected within the secondary ejector plate 300. Both the straight ejector pin 310 and the sleeve 320 extend through the lower template 130 to communicate with the horn-shaped flow channel 40. An inner ejector pin 330 is movably positioned within the sleeve 320, extending from the side near the horn-shaped flow channel 40 to a point where a buckle 340 is provided. The other side of the fourth ejector pin 330 extends and is fixedly connected to the primary ejector plate 200. Furthermore, a lever 400 is rotatably connected between the secondary ejector plate 300 and the primary ejector plate 200 via a rotating member 410, which is fixedly connected to the primary ejector plate 200. A stop block 420 is fixedly connected to the side of the die foot 120 near the secondary ejector plate 300. One end of the lever 400 is located on the side of the stop block 420 away from the lower template 130, and the other end is in contact with the secondary ejector plate 300. It is used to rotate along the rotating member 410 under the limiting action of the stop block 420, thereby prying the secondary ejector plate 300 to move relative to the primary ejector plate 200. In this invention, the straight ejector pin 310 and the ejector sleeve 320 both extend through the lower template 130 to be connected to the horn flow channel 40. The inner ejector pin 330 in the ejector sleeve 320 extends to the side of the horn flow channel 40 near the horn flow channel 40 and is provided with an inverted buckle 340. Compared with the first background mechanism, it produces less waste and has higher stability than the second background mechanism. Thus, this invention not only achieves the purpose of saving materials and reducing the production cost of product 60, but also has a secondary ejection function to prevent the ejector (not shown in the figure) from clamping product 60, making product 60 difficult to remove. Therefore, it has high stability.

[0041] It should be noted that the present invention is not limited to the above embodiments. Any simple modifications, equivalent changes and alterations made by those skilled in the art to the above embodiments based on the technical solutions of the present invention shall fall within the protection scope of the present invention.

Claims

1. A secondary stripping head mechanism, comprising: The mold is provided with mold feet (120) and a primary ejector plate (200), and the lower mold core (140) is provided with a horn-shaped runner (40), characterized in that: A secondary ejector plate (300) is movably disposed on the side of the primary ejector plate (200) near the lower mold core (140). A straight ejector pin (310) and an ejector sleeve (320) are fixedly connected inside the secondary ejector plate (300). Both the straight ejector pin (310) and the ejector sleeve (320) extend through the lower mold core (140) to communicate with the horn-shaped flow channel (40). An inner ejector pin (330) is movably disposed inside the ejector sleeve (320). The inner ejector pin (330) extends from the side near the horn-shaped flow channel (40) to the horn-shaped flow channel (40) and is provided with a buckle (340). The other side of the inner ejector pin (330) extends to be fixedly connected to the primary ejector plate (200). A lever (400) is rotatably connected between the secondary ejector plate (300) and the primary ejector plate (200) via a rotating component (410). A stop block (420) is fixedly connected to the side of the mold foot (120) near the secondary ejector plate (300). One end of the lever (400) is located on the side of the stop block (420) away from the lower mold core (140), and the other end is in contact with the secondary ejector plate (300).

2. The secondary stripping head mechanism as described in claim 1, characterized in that: The contact area between the inverted buckle (340) of the inner ejector pin (330) and the horn-shaped flow channel (40) is greater than the contact area with the inner ejector pin (330).

3. The secondary stripping head mechanism as described in claim 1, characterized in that: An ejector rod is fixedly connected inside the primary ejector plate (200) for ejecting the product (60) for the first time. A flat top (210) is fixedly connected inside the secondary ejector plate (300) for ejecting the product (60) for the second time.

4. The secondary stripping head mechanism as described in claim 1, characterized in that: The rotating component (410) is fixedly connected to the primary ejector plate (200).

5. A secondary stripping head mechanism as described in claim 4, characterized in that: The rotating component (410) is a rotating pin.

6. The secondary stripping head mechanism as described in claim 1, characterized in that: The secondary ejector plate (300) is fixedly connected to a return pin (350) on the side near the lower mold core (140), and the return pin (350) is wrapped with an elastic element (360).

7. A secondary stripping head mechanism as described in claim 6, characterized in that: The elastic element (360) is a spring.

8. The secondary stripping head mechanism as described in claim 1, characterized in that: A wear-resistant plate (430) is fixedly connected to the side of the secondary ejector plate (300) that contacts the lever (400).

9. A secondary stripping head mechanism as described in claim 1, characterized in that: The straight ejector pin (310) and the ejector sleeve (320) are fixedly connected to the secondary ejector plate (300) by a fixing block (370).

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