Ejector mechanism for a plastic mold

Abstract

This utility model relates to the field of plastic mold technology and discloses an ejector mechanism for a plastic mold. The ejector mechanism adopts a connecting arm type lifting drive structure. The ejector mechanism is installed in the lower mold part of the plastic mold. The stripper pin is installed on the upper part of the bottom support along with the lifting support. During the mold opening process, the stripper pin can be lifted by moving the upper mold base through the drive connecting arm. No additional drive source is required and it can maintain a synchronous working state with the mold. The structure is simple and the operation is reliable. A circular head seat is provided at the end of the stripper pin. After the mold is closed, the push force provided by the return spring can make the circular head seat fit tightly into the groove structure in the mold cavity. After closing, the circular head seat can seal the connecting hole, ensuring that the mold cavity is in a relatively closed working state. This can effectively reduce the loss of injection liquid caused by overflow of the hole and avoid the occurrence of burrs on the workpiece, which is conducive to improving the quality of the finished workpiece.

Description

Technical Field

[0001] This utility model relates to the field of plastic mold technology, specifically to an ejector mechanism for a plastic mold. Background Technology

[0002] Plastic molds are the main molding tools in plastic tool processing. When used, plastic molds are usually matched with plastic molding machines. After molding through a specific mold cavity structure, they can give plastic products a complete shape and precise dimensions. They are widely used in the production and processing of plastic products, toys, workpiece shells, etc.

[0003] To facilitate product demolding after plastic molding, an ejector mechanism is required at the top of the plastic mold. In terms of structural design, existing ejector mechanisms are mostly located inside the molding cavity of the plastic mold. The ejector structure and the mold cavity are mostly simple hole-fitting installation structures. Due to the moving fit and wear, there is a gap between the ejector and the mold after the mold is closed, which leads to the leakage and filling of the injection molding liquid, resulting in waste of injection molding liquid and the generation of defects such as large burrs and long cylindrical protrusions on the upper part of the molded workpiece. Therefore, an ejector mechanism for plastic mold is proposed. Utility Model Content

[0004] The purpose of this invention is to provide an ejector mechanism for a plastic mold to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an ejector mechanism for a plastic mold, comprising an ejector assembly installed on the upper part of the plastic mold, wherein the ejector assembly includes a bottom support, a lifting support, a lifting guide post, a return spring, a stripping ejector post, and a drive connecting arm;

[0006] The bottom support is installed in the middle of the lower mold base of the plastic mold. The lifting support is installed on the upper part of the bottom support by means of the lifting guide column and the return spring. The stripping top column is installed on the upper part of the lifting support. The upper end of the stripping top column is provided with a circular head seat.

[0007] The drive arms are arranged in pairs, and the lifting support is installed by pulling and driving the upper mold base of the plastic mold through the drive arms.

[0008] Preferably, the bottom support is a rectangular pedestal, and the bottom support is fixedly installed to the base of the lower mold base of the plastic mold by bolts.

[0009] Preferably, multiple lifting guide columns are provided, with the lower part of the lifting guide column fixedly installed at the upper corner of the bottom support, and the upper part of the lifting guide column inserted into the round hole in the middle of the mold base of the lower mold base of the plastic mold.

[0010] Preferably, the upper corner of the lifting support is provided with a guide hole, and the lifting support is vertically slidably installed on the upper part of the lifting guide column through the guide hole. The return spring is fitted on the upper part of the lifting guide column and is installed in contact with the upper part of the lifting support.

[0011] Preferably, multiple stripping top columns are provided, and several stripping top columns are vertically fixedly installed on the upper part of the lifting support. The upper part of the stripping top column is fitted and inserted into the mounting through hole provided in the middle of the lower mold base of the plastic mold.

[0012] Preferably, the circular head is fixedly installed on the upper end of the stripper column, and after the mold is closed, the circular head is fitted into the fitting groove provided on the upper part of the mounting through hole.

[0013] Preferably, the edges of the lifting support and the upper mold base of the plastic mold are fixedly installed with connecting end shafts. The lower connecting end shaft is inserted into the shaft hole provided at the lower part of the drive arm. The upper part of the drive arm is provided with an end shaft guide groove, and the upper connecting end shaft is fitted and snapped into the end shaft guide groove.

[0014] Compared with the prior art, the present invention, by adopting the above technical solution, has the following technical effects:

[0015] This ejector mechanism adopts a connecting arm type lifting drive structure. The ejector mechanism is installed in the lower mold part of the plastic mold. The stripper pin is installed on the upper part of the bottom support along with the lifting support. During the mold opening process, the stripper pin can be lifted by moving the upper mold base through the drive connecting arm. No additional drive source is required and it can maintain a synchronous working state with the mold. The structure is simple and the operation is reliable. A circular head seat is set at the end of the stripper pin. After the mold is closed, the push force provided by the return spring can make the circular head seat fit tightly into the groove structure in the mold cavity. After closing, the circular head seat can seal the connecting hole, ensuring that the mold cavity is in a relatively closed working state. This can effectively reduce the loss of injection liquid caused by overflow of the hole and avoid the occurrence of burrs on the workpiece, which is conducive to improving the quality of the finished workpiece. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application 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 only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the working structure of this utility model in the closed mold state;

[0018] Figure 2 This is a schematic diagram of the working structure of this utility model in the mold-open state;

[0019] Figure 3 This is a schematic diagram of the overall three-dimensional structure of this utility model;

[0020] Figure 4 This is a schematic diagram of the working installation structure of the unloading top column of this utility model;

[0021] Figure 5 For the present utility model Figure 4 Schematic diagram of the structure of region A in the middle.

[0022] Explanation of reference numerals in the attached drawings: 1. Bottom support; 2. Lifting support; 3. Lifting guide column; 4. Return spring; 5. Unloading top column; 6. Drive arm; 7. Connecting end shaft; 8. End shaft guide groove; 9. Circular head seat. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0025] Example

[0026] Please see Figure 1-5 This utility model provides a technical solution: an ejector mechanism for a plastic mold, including an ejector assembly installed on the upper part of the plastic mold. The ejector assembly includes a bottom support 1, a lifting support 2, a lifting guide post 3, a return spring 4, a stripping ejector post 5, and a drive connecting arm 6. Specifically, see attached... Figure 1 As shown, the bottom support 1 is a rectangular pedestal shape. The bottom support 1 is fixedly installed to the base of the lower mold base of the plastic mold by bolts. The lifting support 2 is supported by the lifting guide column 3 and, in conjunction with the return spring 4, is movably installed on the upper part of the bottom support 1. Figure 3As shown, four lifting guide pillars 3 are provided. The lower part of the lifting guide pillar 3 is fixedly installed at the upper corner of the bottom support 1. The upper part of the lifting guide pillar 3 is inserted into the round hole in the middle of the mold base of the lower mold base of the plastic mold. In order to cooperate with the lifting guide pillar 3, a guide hole is provided through the upper corner of the lifting support 2. The lifting support 2 is vertically slidably installed on the upper part of the lifting guide pillar 3 through the guide hole. The return spring 4 is fitted on the upper part of the lifting guide pillar 3. The return spring 4 is installed in contact with the upper part of the lifting support 2, which can provide elastic pushing force for the lowering and resetting of the lifting support 2.

[0027] Eight ejector pins 5 are provided, and these eight ejector pins 5 are vertically fixed on the upper part of the lifting support 2. The upper part of the ejector pin 5 is fitted and inserted into the mounting through hole in the middle of the lower mold base of the plastic mold. To improve the sealing of the upper part of the ejector pin 5, as shown in the attached figure... Figure 5 As shown, a circular head seat 9 is provided at the upper end of the ejector pin 5. The circular head seat 9 is fixedly installed at the upper end of the ejector pin 5. After the mold is closed, the circular head seat 9 is fitted into the fitting groove provided at the upper part of the mounting through hole. After the mold is closed, the push force provided by the return spring 4 can make the circular head seat 9 fit tightly into the groove structure in the mold cavity. After closing, the circular head seat 9 can seal the connecting hole, ensuring that the mold cavity is in a relatively closed working state. This can effectively reduce the loss of injection liquid caused by overflow of the hole and avoid the occurrence of burrs on the workpiece, which is conducive to improving the quality of the finished workpiece.

[0028] The drive arm 6 is used for the upward movement drive of the lifting support 2, as shown in the attached figure. Figure 2 As shown, the drive arms 6 are arranged in pairs. In order to cooperate with the drive arms 6, connecting shafts 7 are fixedly installed on the edges of the lifting support 2 and the upper mold base of the plastic mold. The lower connecting shaft 7 is inserted into the shaft hole provided on the lower part of the drive arms 6 to realize the rotational support of the lower part of the drive arms 6. The upper part of the drive arms 6 is provided with an end shaft guide groove 8. The upper connecting shaft 7 is fitted and snapped into the end shaft guide groove 8. The lifting support 2 is installed with the upper mold base of the plastic mold through the drive arms 6. The lifting drive structure adopts a connecting arm type. The ejector pin mechanism is installed in the lower mold part of the plastic mold. The ejector pin 5 is installed on the upper part of the bottom support 1 along with the lifting support 2. During the mold opening process, the ejector pin 5 can be lifted by moving the upper mold base through the drive arms 6. No additional drive source is required and it can maintain a synchronous working state with the mold. The structure is simple and the operation is reliable. In order to prevent the drive arms 6 from disengaging during operation, a limit end seat is provided at the end of the connecting shaft 7.

[0029] Working principle or structural principle: In the mold-open state, as shown in the attached... Figure 2As shown, the drive arm 6 moves the lifting support 2 upward due to the pull of the shaft 7 at the edge of the upper mold of the plastic mold. At this time, the ejector pin 5 is in an upward lifting state. When closing, the upper mold of the plastic mold moves downward slowly, and at the same time, the lifting support 2 moves the ejector pin 5 downward due to the resistance of the return spring 4. After the mold is closed, the round head seat 9 at the top of the ejector pin 5 is tightly fitted and installed with the fitting groove on the upper part of the molding part of the lower mold base by the elastic resistance of the return spring 4. After closing, the round head seat 9 can seal the connection hole through the connection hole, ensuring that the mold cavity is relatively closed. The workpiece is in working condition. Then, the injection molding liquid is filled into the interior of the plastic mold cavity by pouring. After the workpiece cools and solidifies, the upper mold part of the plastic mold moves upward to open the mold. At the same time, the connecting end shaft 7 on the side of the upper mold base moves in the end shaft guide groove 8 in the middle of the drive arm 6. When the connecting end shaft 7 reaches the upper opening side of the end shaft guide groove 8, the drive arm 6 is driven upward by the connecting end shaft 7. The drive arm 6 drives the lifting support 2 to move the stripper column 5 upward and lift it. The workpiece after molding is separated from the mold base by the lifting of the circular head seat 9. Then, the demolded workpiece is picked up by the tool to complete the processing work.

[0030] In summary, this ejector mechanism adopts a connecting arm type lifting drive structure. The ejector mechanism is installed in the lower mold part of the plastic mold. The stripper 5 is movably installed on the upper part of the bottom support 1 along with the lifting support 2. During the mold opening process, the stripper 5 can be lifted by moving the upper mold base through the drive connecting arm 6. No additional drive source is required and it can maintain a synchronous working state with the mold. The structure is simple and the operation is reliable. Furthermore, a circular head seat 9 is provided at the end of the stripper 5. After the mold is closed, the push force provided by the return spring 4 can make the circular head seat 9 fit tightly into the groove structure in the mold cavity. After closing, the circular head seat 9 can seal the connecting hole, ensuring that the mold cavity is in a relatively closed working state. This can effectively reduce the loss of injection liquid caused by overflow from the hole and avoid the occurrence of burrs on the workpiece, which is conducive to improving the quality of the finished workpiece.

[0031] Those skilled in the art will understand that the features described in the various embodiments and / or claims of this utility model can be combined or combined in various ways, even if such combinations or combinations are not explicitly described in this utility model. In particular, the features described in the various embodiments and / or claims of this utility model can be combined or combined in various ways without departing from the spirit and teachings of this utility model. All such combinations and / or combinations fall within the scope of this utility model.

Claims

1. A pin mechanism for a plastic mold comprising a pin assembly mounted to an upper portion of the plastic mold, characterized by: The ejector pin assembly includes a bottom support (1), a lifting support (2), a lifting guide column (3), a return spring (4), a stripping ejector column (5), and a drive arm (6); The bottom support (1) is installed in the middle of the lower mold base of the plastic mold. The lifting support (2) is supported by the lifting guide column (3) and pushed and moved on the upper part of the bottom support (1) by the reset spring (4). The stripping top column (5) is installed on the upper part of the lifting support (2). The upper end of the stripping top column (5) is provided with a circular head seat (9). The drive arms (6) are arranged in pairs, and the lifting support (2) is installed with the upper mold base of the plastic mold through the drive arms (6).

2. The ejector mechanism for a plastic mold according to claim 1, characterized in that: The bottom support (1) is a rectangular pedestal, and the bottom support (1) is fixedly installed to the base of the lower mold base of the plastic mold by bolts.

3. The ejector mechanism of a plastic mold according to claim 2, characterized in that: Multiple lifting guide columns (3) are provided. The lower part of the lifting guide column (3) is fixedly installed at the upper corner of the bottom support (1). The upper part of the lifting guide column (3) is inserted into the round hole in the middle of the mold base of the lower mold base of the plastic mold.

4. The ejector mechanism of a plastic mold according to claim 3, characterized in that: The upper corner of the lifting support (2) is provided with a guide hole. The lifting support (2) is vertically slidably installed on the upper part of the lifting guide column (3) through the guide hole. The return spring (4) is fitted on the upper part of the lifting guide column (3) and is installed in contact with the upper part of the lifting support (2).

5. The ejector mechanism of a plastic mold according to claim 4, characterized in that: Multiple stripping top columns (5) are provided, and several stripping top columns (5) are vertically fixedly installed on the upper part of the lifting support (2). The upper part of the stripping top column (5) is fitted and inserted into the mounting through hole provided in the middle of the lower mold base of the plastic mold.

6. The ejector mechanism of a plastic mold according to claim 5, characterized in that: The circular head seat (9) is fixedly installed on the upper end of the stripper column (5). After the mold is closed, the circular head seat (9) is fitted into the fitting groove provided on the upper part of the mounting through hole.

7. The ejector mechanism of a plastic mold according to claim 1, characterized in that: The lifting support (2) and the upper mold base of the plastic mold are both fixedly installed with connecting end shafts (7). The lower connecting end shaft (7) is inserted into the shaft hole provided at the lower part of the drive arm (6). The upper part of the drive arm (6) is provided with an end shaft guide groove (8). The upper connecting end shaft (7) and the end shaft guide groove (8) are fitted and snapped together.

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