Secondary ejection structure of glue frame of injection mold

Abstract

The utility model discloses a glue frame secondary ejection structure of injection mold, including the back mould kernel, the back mould kernel top extends the length direction and is equipped with the channel, the forming block, along the channel length direction and lay, a side of the forming block top is connected with a plurality of sections forming part, the glue injection groove, set up in a side top of the forming block, and be located the below of forming part, first thimble, set up in the back mould kernel bottom, the utility model discloses through being provided with the forming block of up and down removal, make the glue frame after forming, can be driven under the first thimble, along with the forming block and move upwards and leave the parting surface, then second thimble moves upwards, make the glue frame be again and go up and prop up, leave the surface of forming block, complete demoulding, the whole ejection process does not participate in the sliding block, can not cause the adhesion of glue frame, and the ejection mode is simple, need not carry out the glue reduction processing, make the appearance flatness of the glue frame after forming be guaranteed, be convenient for batch production.

Description

Technical Field

[0001] This utility model specifically relates to a secondary ejection structure for the rubber frame of an injection mold. Background Technology

[0002] Plastic-coated iron is a composite material of glue and iron. In the process of plastic-coated iron injection molding, the molten glue used for injection needs to enter the mold cavity through the preset gate channel. After the plastic-coated iron product cools and solidifies, the injection molded plastic-coated iron product is ejected from the mold core using ejector pins. Currently, after the plastic frame is formed using injection molds, it is ejected by a slide block. However, the plastic frame is prone to sticking to the slide block, making ejection inconvenient. To avoid this, the plastic frame is usually degassed at the gate. However, this can damage the appearance of the plastic frame, affecting its aesthetics and requiring subsequent repairs.

[0003] Therefore, it is necessary to invent a secondary ejection structure for the plastic frame of an injection mold to solve the above problems. Utility Model Content

[0004] (a) Purpose of the utility model To address the technical problems existing in the background art, this utility model proposes a secondary ejection structure for the plastic frame of an injection mold. By setting a molding block that can move up and down, the plastic frame, after molding, can move upward with the molding block and leave the parting surface under the drive of the first ejector pin. Subsequently, the second ejector pin moves upward, causing the plastic frame to be ejected upward again and leave the surface of the molding block, thus completing demolding. The entire ejection process does not involve the participation of a slider, which will not cause the plastic frame to stick. The ejection method is simple and does not require plastic reduction treatment, thus ensuring the flatness of the appearance of the molded plastic frame and facilitating mass production.

[0005] (II) Technical Solution To achieve the above objectives, this utility model provides the following technical solution: a secondary ejection structure for the plastic frame of an injection mold, including a rear mold core, wherein a groove is formed on the top of the rear mold core along its length direction; A molding block is laid along the length of the channel, and a number of molding sections are connected to one side of the top of the molding block; The glue injection groove is opened on the top side of the molding block and located below the molding part; The first ejector pin is located at the bottom of the rear mold core, and its top extends into the interior of the molding block, for driving the molding block to move vertically. The second ejector pin is located at the bottom of the rear mold core, and its top end passes through the molding block and the molding part in sequence, and is used to eject the plastic frame formed at the molding part.

[0006] Preferably, the cross-section of the molding block is trapezoidal, and the length of the top side is greater than the length of the bottom side. The top side of the molding block away from the molding part, as well as the front and rear sides, all bulge upward to form protrusions.

[0007] Preferably, there are several first ejector pins arranged in a straight line along the length of the molding block, and several T-shaped grooves are opened at the bottom of the molding block, with the top of the first ejector pins matching the T-shaped grooves.

[0008] Preferably, there are several second ejector pins arranged in a straight line along the length of the forming part, and the forming part and the forming block are provided with through holes for the insertion of the tip of the second ejector pin.

[0009] Preferably, the top of the rear mold core is provided with a runner, and the runner's submersible gate is connected to the injection groove.

[0010] Preferably, the bottom of the rear mold core is provided with a plurality of ejector pins, the tops of which extend into the flow channel.

[0011] Compared with the prior art, the beneficial effects of the above-mentioned technical solution of this utility model are: This invention features a molding block that can move up and down, allowing the plastic frame to move upwards and leave the parting surface under the drive of the first ejector pin after molding. Subsequently, the second ejector pin moves upwards, causing the plastic frame to be lifted upwards again and leave the surface of the molding block, thus completing demolding. The entire ejection process is done without the participation of a slider, preventing the plastic frame from sticking together. The ejection method is simple and does not require any reduction of plastic material, ensuring the flatness of the molded plastic frame and facilitating mass production. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a half-sectional view of the present invention; Figure 3 This utility model Figure 2 Enlarged view of the A-section structure; Figure 4 This is a front sectional view of the present invention; Figure 5 This is an exploded view of the rear mold core and molding block of this utility model.

[0013] Explanation of reference numerals in the attached figures: 1. Rear mold core, 2. Channel, 3. Molding block, 6. First ejector pin, 7. Second ejector pin, 8. Protrusion, 9. T-slot, 10. Through hole, 11. Runner, 12. Sprue head ejector pin. Detailed Implementation

[0014] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0015] This utility model provides, for example Figure 1-5 The shown is a secondary ejection structure of the plastic frame of an injection mold, including a rear mold core 1, wherein a groove 2 is provided on the top of the rear mold core 1 along its length direction; The molding block 3 is laid along the length of the channel 2, and several molding sections are connected to one side of the top of the molding block 3. The glue injection groove is opened on the top side of the molding block 3 and is located below the molding part; The first ejector pin 6 is located at the bottom of the rear mold core 1, and its top extends into the interior of the molding block 3, for driving the molding block 3 to move vertically. The second ejector pin 7 is located at the bottom of the rear mold core 1, and its top end passes through the molding block 3 and the molding part in sequence, and is used to eject the plastic frame formed at the molding part.

[0016] In one embodiment, the cross-section of the molding block 3 is set as trapezoidal, and the length of the top side is greater than the length of the bottom side, which facilitates the upward movement of the molding block 3. The top side of the molding block 3 away from the molding part and the front and rear sides are all raised to form protrusions 8, so that the top of the molding block 3 has a groove, which can better match the front mold when preparing the plastic frame.

[0017] In one embodiment, a plurality of first ejector pins 6 are provided and distributed in a straight line along the length of the molding block 3. A plurality of T-shaped grooves 9 are provided at the bottom of the molding block 3. The top of the first ejector pin 6 is adapted to the T-shaped grooves 9, so that the molding block 3 can move freely up or down with the first ejector pin 6, which facilitates the ejection of the glue frame and the reset of the molding block 3 after translation.

[0018] In one embodiment, a plurality of second ejector pins 7 are provided and distributed in a straight line along the length of the molding part. The molding part and the molding block 3 are provided with through holes 10 for the top of the second ejector pins 7 to be inserted, so that the second ejector pins 7 can push the molded plastic frame upward.

[0019] In one embodiment, the top of the rear mold core 1 is provided with a runner 11, the runner 11 being connected to the injection groove to guide the molten adhesive so that it can be molded into a plastic frame product at the molding part.

[0020] In one embodiment, the bottom of the rear mold core 1 is provided with a plurality of ejector pins 12, the top of which extends into the flow channel 11. After the production of the plastic frame is completed, the ejector pins 12 can be driven upward to push out the molten material that has condensed in the flow channel 11. This allows for recycling and ensures that the residual molten material in the flow channel 11 will not affect the injection molding quality of the next plastic frame.

[0021] The specific implementation method is as follows: In use, the attached reference numeral 13 represents the molded plastic frame product. Specifically, the rear mold core 1 is installed on the parting surface of the rear mold of the external injection mold, and the front mold is installed on its top. During the production of the plastic frame, the operator injects molten plastic into the front mold through the front mold gate. The molten plastic flows into the injection groove along the flow channel 11. After the molten plastic cools and solidifies, that is, when the plastic frame product is formed, the front mold begins to move away from the rear mold, causing the parting surface to open. At this time: Under the action of the ejector plate at the bottom of the rear mold, the first ejector pin 6 begins to move upward, causing the entire molding block 3 to move upward along the height direction of the channel 2, thereby pushing the entire molding part upward away from the rear parting surface, so that the plastic frame is pushed upward along with the molding part for the first time and separates from the rear mold parting surface. Furthermore, the bottom ejector plate of the rear mold works again, causing the second ejector pin 7 to move upward. At this time, the second ejector pin 7 moves vertically upward along the hole, pushing the plastic frame that is in contact with the molding part upward, so that it is separated from the surface of the molding part, and the demolding is completed. This embodiment specifically solves the problem that in the prior art, after the plastic frame is formed by injection molding, the plastic frame is ejected by a slider ejector. However, the plastic frame is easy to stick to the slider, making ejection inconvenient. To avoid this, the plastic frame is usually de-plasticized at the gate. However, this will cause the appearance of the plastic frame to become damaged, affecting its aesthetics and requiring subsequent repair.

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used above are only some embodiments recorded in this utility model. Obviously, those skilled in the art can obtain other drawings based on these drawings.

[0023] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A secondary ejection structure for the plastic frame of an injection mold, characterized in that: include: The rear mold core (1) has a groove (2) on its top along its length direction; The molding block (3) is laid along the length of the channel (2), and a number of molding sections are connected to one side of the top of the molding block (3); The glue injection groove is opened on the top of one side of the molding block (3) and located below the molding part; The first ejector pin (6) is located at the bottom of the rear mold core (1) and its top extends into the interior of the molding block (3) to drive the molding block (3) to move vertically. The second ejector pin (7) is located at the bottom of the rear mold core (1), and its top end passes through the molding block (3) and the molding part in sequence, and is used to eject the plastic frame formed at the molding part.

2. The secondary ejection structure of the injection mold frame according to claim 1, characterized in that: The cross-section of the molding block (3) is set as trapezoidal, and the length of the top side is greater than the length of the bottom side. The top side of the molding block (3) away from the molding part and the front and rear sides are all raised to form protrusions (8).

3. The secondary ejection structure of the injection mold frame according to claim 1, characterized in that: The first ejector pin (6) is provided in several ways and is distributed in a straight line along the length of the molding block (3). The bottom of the molding block (3) is provided with several T-shaped grooves (9), and the top of the first ejector pin (6) is adapted to the T-shaped grooves (9).

4. The secondary ejection structure of the injection mold frame according to claim 1, characterized in that: The second ejector pin (7) is provided in several ways and is distributed in a straight line along the length of the molding part. The molding part and the molding block (3) are provided with through holes (10) for the top of the second ejector pin (7) to be inserted.

5. The secondary ejection structure of the injection mold frame according to claim 1, characterized in that: The top of the rear mold core (1) is provided with a flow channel (11), and the submersible gate of the flow channel (11) is connected to the injection groove.

6. The secondary ejection structure of the injection mold frame according to claim 5, characterized in that: The bottom of the rear mold core (1) is provided with several ejector pins (12), and the top of the ejector pins (12) extends into the flow channel (11).

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