Multi-stage runner balance structure of thin-wall rubber frame injection mold

Abstract

The utility model discloses a multi-stage runner balance structure of a thin-wall rubber frame injection mold, which comprises a front mold, a rear mold arranged below the front mold, an upper mold core connected with the bottom of the front mold, a first-stage runner arranged at the bottom of each of the left side and the right side of the upper mold core, and a second-stage runner arranged at the bottom of each of the left side and the right side of the upper mold core, two primary runners are formed in the bottoms of the front side and the rear side of the upper mold core, and a plurality of glue injection nozzles are mounted in the front mold. According to the utility model, the second-stage runner is additionally arranged on the front side of the first-stage runner on the front side, so that melt glue flows along the extension direction of the second-stage runner before being sprayed into the first-stage runner on the front side, the time of flowing into the first-stage runner on the front side is delayed, and the temperature difference between the first-stage runner and the melt glue is reduced; according to the injection mold, melt glue can be prevented from being solidified in the first-stage runner on the front side, so that glue on the four sides of the injection mold for the thin-wall glue frame is relatively stable, and the forming quality of a thin-wall glue frame product is guaranteed.

Description

A multi-stage flow channel balancing structure for thin-walled rubber frame injection molds Technical Field

[0001] This utility model specifically relates to a multi-stage flow channel balancing structure for a thin-walled rubber frame injection mold. Background Technology

[0002] Thin-walled plastic frame injection molds are a type of precision injection mold specifically designed for producing thin-walled plastic frame structures. They are characterized by extremely thin wall thickness (usually ≤1.5mm), lightweight structure, and often feature hollow or mesh designs. Specifically, molten plastic is injected into the parting surface of the upper and lower molds, enters the cavity through a pre-set runner, and after cooling and solidification, ejector pins are used to eject the injection-molded thin-walled plastic frame product from the mold core.

[0003] Currently, when molten plastic is sprayed directly into the runner through the injection nozzle on all four sides of thin-walled plastic frame products, the molten plastic will solidify first when it enters the runner because the initial temperature of the mold core is low. It is necessary to continuously inject molten plastic to continue the flow.

[0004] However, since the front wall thickness of thin-walled plastic frame products is thinner than the other three sides, usually less than 0.6mm, solidification is more likely to occur inside the flow channel than on the other three sides. If the glue is injected on all four sides at the same time, it will lead to unstable glue flow in the subsequent process, affecting the molding quality of thin-walled plastic frame products.

[0005] Therefore, it is necessary to invent a multi-stage flow channel balancing structure for thin-walled rubber frame injection molds to solve the above problems. Summary of the Invention

[0006] (a) Purpose of the utility model

[0007] To address the technical problems existing in the background art, this utility model proposes a multi-stage flow channel balancing structure for a thin-walled plastic frame injection mold. By adding a secondary flow channel in front of the primary flow channel, the molten adhesive flows along the extension direction of the secondary flow channel before being injected into the primary flow channel, delaying the time it takes to flow into the primary flow channel. This reduces the temperature difference between the primary flow channel and the molten adhesive, preventing the molten adhesive from solidifying in the primary flow channel. Consequently, the flow of adhesive on all four sides of the thin-walled plastic frame injection mold is more stable, ensuring the molding quality of the thin-walled plastic frame product.

[0008] (II) Technical Solution

[0009] To achieve the above objectives, this utility model provides the following technical solution: a multi-stage flow channel balancing structure for a thin-walled rubber frame injection mold, including a front mold and a rear mold disposed below the front mold;

[0010] The upper mold core is connected to the bottom of the front mold. A primary flow channel is opened on the bottom of both the left and right sides of the upper mold core, and two primary flow channels are opened on the bottom of both the front and rear sides of the upper mold core.

[0011] Several injection nozzles are installed inside the front mold and positioned above the middle of each primary runner.

[0012] Two secondary flow channels are opened at the bottom front side of the upper mold core, and are respectively located in front of the two primary flow channels;

[0013] Among them, the two primary flow channels on the front side of the upper mold core are both set as left and right sections, and the left and right sections of the primary flow channels are connected through the secondary flow channel in front.

[0014] The lower mold core is connected to the top of the rear mold, and a mold cavity for thin-walled plastic frame injection molding is formed between the lower mold core and the upper mold core.

[0015] Preferably, the two primary flow channels located on the bottom of the front and rear sides of the upper mold core are arranged flush with each other.

[0016] Preferably, each of the primary flow channels is configured as a straight line extending along the length of the side of the upper mold core where it is located.

[0017] Preferably, the secondary flow channel is configured in a W shape with its opening facing the primary flow channel, and the middle part of the secondary flow channel is aligned front to back with the adjacent primary flow channel.

[0018] Preferably, the bottom nozzle of each of the injection nozzles located on the rear side of the upper mold core and on the left and right sides is connected to the middle of the primary flow channel below it, and the bottom nozzle of each of the injection nozzles located on the front side of the upper mold core is connected to the middle of the secondary flow channel.

[0019] Preferably, the upper mold also has an injection channel inside, and the injection channel is connected to the top of each injection nozzle.

[0020] Compared with the prior art, the beneficial effects of the above-mentioned technical solution of this utility model are:

[0021] This invention adds a secondary flow channel to the thin-walled section of the thin-walled plastic frame product, specifically in front of the primary flow channel. Before the molten adhesive is injected into the primary flow channel, it flows along the extension direction of the secondary flow channel and splits into two streams flowing into the two sections of the primary flow channel on either side of the secondary flow channel. This delays the flow of the molten adhesive into the primary flow channel. Since the primary flow channel is already heated, the temperature difference between it and the molten adhesive is small, preventing solidification of the molten adhesive within the primary flow channel. This ensures stable flow of adhesive on all four sides of the thin-walled plastic frame injection mold, guaranteeing the molding quality of the thin-walled plastic frame product. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0023] Figure 1 is a schematic diagram of the overall structure of this utility model;

[0024] Figure 2 is a distribution diagram of the glue injection nozzles of this utility model;

[0025] Figure 3 shows the distribution of the injection nozzle and lower mold core of this utility model;

[0026] Figure 4 is a bottom view of the upper mold core of this utility model;

[0027] Figure 5 is a schematic diagram of the connection structure between the upper mold core and the lower mold core when the mold is closed according to this utility model.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. Front mold, 2. Rear mold, 3. Upper mold core, 4. Primary runner, 5. Injection nozzle, 6. Secondary runner, 7. Lower mold core, 8. Injection channel. Detailed Implementation

[0030] 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.

[0031] This utility model provides a multi-stage flow channel balance structure for a thin-walled rubber frame injection mold, as shown in Figures 1-5, including a front mold 1 and a rear mold 2 disposed below the front mold 1;

[0032] The upper mold core 3 is connected to the bottom of the front mold 1. A primary flow channel 4 is opened on the bottom of both the left and right sides of the upper mold core 3, and two primary flow channels 4 are opened on the bottom of both the front and rear sides of the upper mold core 3.

[0033] Several injection nozzles 5 are installed inside the front mold 1 and positioned above the middle of each primary flow channel 4;

[0034] Two secondary flow channels 6 are opened at the bottom front side of the upper mold core 3 and are located directly in front of the two primary flow channels 4 respectively;

[0035] Among them, the two primary flow channels 4 located on the front side of the upper mold core 3 are both set as left and right sections, and the left and right sections of the primary flow channels 4 are connected through the secondary flow channel 6 directly in front.

[0036] The lower mold core 7 is connected to the top of the rear mold 2, and a mold cavity for thin-walled rubber frame injection molding is formed between the lower mold core 7 and the upper mold core 3.

[0037] In one embodiment, the two primary flow channels 4 located on the bottom of the front and rear sides of the upper mold core 3 are arranged flush with each other. Each primary flow channel 4 is configured as a straight line extending along the length of the side of the upper mold core 3, which conforms to the flow channel configuration of the thin-walled plastic frame injection mold and can ensure that the molten plastic flows uniformly and stably in the primary flow channel 4.

[0038] In one embodiment, the secondary flow channel 6 is configured as a W-shape with its opening facing the primary flow channel 4. The middle part of the secondary flow channel 6 is aligned front to back with the adjacent primary flow channel 4. The bottom nozzle of each injection nozzle 5 located on the rear side of the upper mold core 3 and on the left and right sides is connected to the middle part of the primary flow channel 4 below it. The bottom nozzle of each injection nozzle 5 located on the front side of the upper mold core 3 is connected to the middle part of the secondary flow channel 6. This delays the time for the molten glue to flow into the primary flow channel 4 located on the front side, reduces the temperature difference between the molten glue and the primary flow channel 4 on the front side, and prevents the molten glue from solidifying in the primary flow channel 4 on the front side.

[0039] In one embodiment, the upper mold is further provided with a glue injection channel 8, which is connected to the top of each glue injection nozzle 5, so as to facilitate the worker to inject molten glue into the cavity.

[0040] The specific implementation method is as follows: When using this utility model, the steel plate used for molding is placed directly in the mold cavity, and then the molten plastic is injected into the mold cavity through the gate. After the molten plastic cools and solidifies, that is, when the thin-walled plastic frame injection molded product is formed, the front mold 1 begins to move away from the rear mold 2, so that the upper mold core 3 and the lower mold core 7 separate, that is, the parting surface opens. At this time, the thin-walled plastic frame injection molded product can be ejected and collected under the action of the ejector pin, thus completing the production of the thin-walled plastic frame injection molded product.

[0041] Specifically, when the molten adhesive is injected into the mold cavity, the molten adhesive first enters the injection channel 8 through the opening at the top of the upper mold. After being divided by the injection channel 8, it flows to the injection nozzles 5 located on the four sides of the upper mold core 3, and flows downwards along the inside of the injection nozzles 5. At this time, the injection nozzles 5 located on the rear side and the left and right sides of the upper mold core 3 directly spray the molten adhesive into the primary runner 4, while the two injection nozzles 5 located on the front side of the upper mold core 3 will first spray the molten adhesive into the middle of the secondary runner 6. At this time, the molten adhesive will flow along the extension of the secondary runner 6. The flow direction is extended, and it splits into two streams that flow into the two sections of the primary flow channel 4 on both sides of the secondary flow channel 6. This allows the molten adhesive to flow slowly into the primary flow channel 4 located at the front, so that the primary flow channel 4 is heated before the molten adhesive flows in. When the molten adhesive flows into the primary flow channel 4 through the secondary flow channel 6, the primary flow channel 4 has a certain amount of heat, and the temperature difference with the molten adhesive is small, which avoids the molten adhesive from solidifying in the primary flow channel 4 at the front. This makes the flow of adhesive on all four sides of the thin-walled plastic frame injection mold more stable, and the molding quality of the thin-walled plastic frame product is guaranteed.

[0042] Meanwhile, for ease of understanding, Figure 5 will be further explained. In Figure 5, reference numeral 9 is a runner prosthesis. Its difference from the upper mold core 3 allows the bottom of the upper mold core 3 to have a primary runner 4 and a secondary runner 6, thus visually showing the position of the primary runner 4 and the secondary runner 6 on the lower mold core 7 when the upper mold and the lower mold are closed.

[0043] This embodiment specifically solves the problem in the prior art that, because the front wall thickness of a thin-walled frame product is thinner than the other three sides, solidification is more likely to occur inside the flow channel than on the other three sides. If glue is injected on all four sides at the same time, it will lead to unstable glue flow in the subsequent process, affecting the molding quality of the thin-walled frame product.

[0044] 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 multi-stage flow channel balancing structure for a thin-walled rubber frame injection mold, characterized in that: include: A front mold (1) and a rear mold (2) located below the front mold (1); an upper mold core (3) connected to the bottom of the front mold (1), with a primary flow channel (4) on the bottom of both the left and right sides of the upper mold core (3), and two primary flow channels (4) on the bottom of both the front and rear sides of the upper mold core (3); several injection nozzles (5) installed inside the front mold (1) and located above the middle of each primary flow channel (4); two secondary flow channels (6) located at the bottom of the front side of the upper mold core (3) and located directly in front of the two primary flow channels (4); wherein the two primary flow channels (4) located on the front side of the upper mold core (3) are each set as left and right sections, and the left and right sections of the primary flow channels (4) are connected through the secondary flow channels (6) directly in front; a lower mold core (7) connected to the top of the rear mold (2), and a mold cavity for thin-walled plastic frame injection molding is formed between the lower mold core (7) and the upper mold core (3).

2. The multi-stage flow channel balancing structure of a thin-walled rubber frame injection mold according to claim 1, characterized in that: in, The two primary flow channels (4) located on the bottom of the front and rear sides of the upper mold core (3) are set at the same level.

3. The multi-stage flow channel balancing structure of a thin-walled rubber frame injection mold according to claim 1, characterized in that: Each of the primary flow channels (4) is configured as a straight line extending along the side length of the upper mold core (3) where it is located.

4. The multi-stage flow channel balancing structure of a thin-walled rubber frame injection mold according to claim 1, characterized in that: The secondary flow channel (6) is configured in a W shape and its opening faces the primary flow channel (4). The middle part of the secondary flow channel (6) is aligned with the adjacent primary flow channel (4).

5. The multi-stage flow channel balancing structure of a thin-walled rubber frame injection mold according to claim 4, characterized in that: in, The bottom nozzle of each of the injection nozzles (5) located on the rear side of the upper mold core (3) and on the left and right sides is connected to the middle of the primary flow channel (4) below it, and the bottom nozzle of each of the injection nozzles (5) located on the front side of the upper mold core (3) is connected to the middle of the secondary flow channel (6).

6. The multi-stage flow channel balancing structure of a thin-walled rubber frame injection mold according to claim 1, characterized in that: The upper mold is also provided with a glue injection channel (8), which is connected to the top of each glue injection nozzle (5).

Images