Multi-cavity lotus-root-node-shaped secondary runner device of injection mold

Abstract

A multi-cavity lotus-root-node-shaped secondary branch runner device of an injection mold comprises a cavity plate body, a main runner is formed in the cavity plate body, a branch runner, a pouring inlet and a cavity are formed in the cavity plate body, one end of the branch runner is communicated with the main runner, the other end of the branch runner is communicated with the pouring inlet, and the pouring inlet is communicated with the cavity. An insert groove is formed in the position, located at the sub-runner, of the upper surface of the cavity plate body, a runner insert is arranged in the insert groove, a lotus root throttling channel is formed in the upper surface of the runner insert, the sub-runner is divided into a first sub-runner section and a second sub-runner section, and the first sub-runner section and the second sub-runner section are communicated through the lotus root throttling channel. People can replace the runner inserts of the lotus root flow passages with different inner diameters according to the sizes of the mold cavities, so that the mold cavities with different shapes and sizes can be filled at the same time, plastic parts in the mold cavities can be subjected to injection molding at the same time, the phenomenon of excessive pressure maintaining is avoided, and the qualification rate of the plastic parts is high.

Description

Technical Field

[0001] The utility model relates to an injection mold, in particular to a multi-cavity lotus root joint-shaped secondary runner device for an injection mold. Background Art

[0002] When producing plastic parts using an injection mold, if multiple plastic parts need to be manufactured simultaneously in a pair of injection molds, multiple cavities need to be opened on the main body of the cavity plate, and multiple corresponding cores need to be provided on the main body of the core plate. After the mold is closed, a mold cavity is formed between the cavity and the core (i.e., one mold with multiple cavities). The plastic melt enters the mold through the main runner and then flows to each cavity through each runner. After the plastic melt in the mold cavity cools, the formed plastic parts are obtained. In one mold with multiple cavities, if each formed plastic part has the same shape and size, and the flow rate of the plastic melt flowing to each runner and mold cavity is also the same, then each mold cavity is filled simultaneously, and the plastic parts can be successfully formed. If each formed plastic part has different shapes and sizes, and the flow rate of the plastic melt flowing to each runner and mold cavity is the same, then the larger mold cavity will not be filled, and the smaller mold cavity will be filled first. Continuing to inject and pressurize will cause overpressure in the mold cavity that is filled first, resulting in flash on the surface of the injection-molded plastic part, generating internal stress, and the plastic parts manufactured in the unfilled mold cavity will be incomplete, and the qualified rate of the product is very low. Summary of the Invention

[0003] The purpose of the utility model is to overcome the defects existing in the prior art and provide a multi-cavity lotus root joint-shaped secondary runner device for an injection mold that can fill different-shaped and -sized mold cavities simultaneously and ensure the product qualification rate.

[0004] The technical solution of a multi-cavity lotus root joint-shaped secondary runner device for an injection mold of the utility model is as follows: It includes a cavity plate body. A main runner is opened in the cavity plate body. A runner, a gate, and a cavity are opened on the cavity plate body. One end of the runner communicates with the main runner, the other end of the runner communicates with the gate, and the gate communicates with the cavity. A insert groove is opened on the cavity plate body at the position of the runner. A runner insert is arranged in the insert groove. An lotus root joint-shaped runner is opened on the runner insert. The runner is divided into a first-stage runner and a second-stage runner, and the first-stage runner and the second-stage runner are communicated through the lotus root joint-shaped runner.

[0005] Further, a perforation is opened in the runner insert, and the runner insert is fixed to the cavity plate body through a fastener passing through the perforation.

[0006] Further, a first connecting runner is opened on the left side of the runner insert at the lotus root joint-shaped runner. One end of the first connecting runner corresponds to the first-stage runner, and the other end of the first connecting runner and the lotus root joint-shaped runner are transitioned through an arc surface.

[0007] Further, a second connecting runner is opened on the right side of the runner insert located in the lotus root runner. One end of the second connecting runner corresponds to the second-stage dividing runner, and the other end of the second connecting runner and the lotus root runner are transitioned through an arc surface.

[0008] The beneficial effects of a multi-cavity lotus root-shaped secondary dividing runner device of an injection mold of the present utility model are as follows: by opening an insert groove in the middle position of the cavity plate body where each dividing runner is located and arranging a runner insert in the insert groove, people can replace the runner insert with a lotus root runner of different inner diameters according to the size of the mold cavity, so that mold cavities of different shapes and sizes can be filled simultaneously, ensuring that plastic parts in the mold cavities can be injection molded simultaneously, avoiding the phenomenon of over-packing, and having a high qualification rate of plastic parts. Description of the Drawings

[0009] Figure 1 is a schematic structural diagram of a multi-cavity lotus root-shaped secondary dividing runner device of an injection mold of the present utility model;

[0010] Figure 2 is a schematic structural diagram of the runner insert;

[0011] Figure 3 is Figure 2 a sectional view taken along the A-A direction of Detailed Embodiment

[0012] The present utility model relates to a multi-cavity lotus root-shaped secondary dividing runner device of an injection mold. As shown in Figure 1 — Figure 3 , it includes a cavity plate body 1. A main runner 2 is opened in the cavity plate body 1. A dividing runner, a pouring gate 3, and a cavity 4 are opened on the cavity plate body 1. One end of the dividing runner communicates with the main runner 2, the other end of the dividing runner communicates with the pouring gate 3, the pouring gate 3 communicates with the cavity 4. An insert groove 5 is opened on the cavity plate body 1 above the dividing runner. A runner insert 6 is arranged in the insert groove 5. A lotus root runner 7 is opened on the runner insert 6. The dividing runner is divided into a first-stage dividing runner 8 and a second-stage dividing runner 9. The first-stage dividing runner 8 and the second-stage dividing runner 9 communicate with each other through the lotus root runner 7.

[0013] Further, a perforation 10 is opened in the runner insert 6. The runner insert 6 is fixed to the cavity plate body 1 through a fastener passing through the perforation 10.

[0014] Further, a first connecting runner 11 is opened on the left side of the runner insert 6 located in the lotus root runner 7. One end of the first connecting runner 11 corresponds to the first-stage dividing runner 8, and the other end of the first connecting runner 11 and the lotus root runner 7 are transitioned through an arc surface 12.

[0015] Further, a second connecting runner 13 is opened on the right side of the runner insert 6 located in the lotus root runner 7. One end of the second connecting runner 13 corresponds to the second-stage dividing runner 9, and the other end of the second connecting runner 13 and the lotus root runner (7) are transitioned through the arc surface 12.

[0016] The utility model discloses a multi-cavity lotus root-shaped secondary dividing runner device for an injection mold, mainly including that a insert groove 5 is opened in the middle position of the cavity plate body 1 where each dividing runner is located, a runner insert 6 is arranged in the insert groove 5, the runner insert 6 is fixed to the insert groove 5 through fasteners, a lotus root runner 7 is opened on the runner insert 6, a first connecting runner 11 is opened at one end of the lotus root runner 7, and a first connecting runner 13 is opened at the other end of the lotus root runner 7. The inner diameter of the first connecting runner 11 is the same as that of the first-stage dividing runner 8, and the two correspond to each other. The inner diameter of the second connecting runner 13 is the same as that of the second-stage dividing runner 9, and the two correspond to each other. The inner diameter of the first connecting runner 11 is also the same as that of the second connecting runner 13. The inner diameter of the lotus root runner 7 is less than or equal to the inner diameters of the first connecting runner 11 and the second connecting runner 13. When the inner diameter of the lotus root runner 7 is less than the inner diameters of the first connecting runner 11 and the second connecting runner 13, the lotus root runner 7 and the first connecting runner 11 and the second connecting runner 13 are transitioned through the arc surface 12. During injection molding, since the sizes and shapes of each mold cavity (i.e., the cavity formed between the cavity and the core) are different, when the volume of the mold cavity is large, the runner insert 6 with a lotus root runner 7 of a larger inner diameter can be replaced, so that the flow rate of the plastic melt passing through the lotus root runner 7 is accelerated. When the volume of the mold cavity is small, the runner insert 6 with a lotus root runner 7 of a smaller inner diameter can be replaced, so that the flow rate of the plastic melt passing through the lotus root runner 7 is slowed down. In this way, the plastic melt can fill each mold cavity simultaneously. For a multi-cavity lotus root-shaped secondary dividing runner device of an injection mold in this solution, by opening the insert groove 5 in the middle position of the cavity plate body 1 where each dividing runner is located and arranging the runner insert 6 in the insert groove 5, people can replace the runner insert 6 with a lotus root runner 7 of different inner diameters according to the size of the mold cavity, so that different-shaped and -sized mold cavities can be filled simultaneously, ensuring that the plastic parts in the mold cavities can be injection-molded simultaneously, avoiding the phenomenon of over-packing, and having a high qualified rate of plastic parts.

Claims

1. An injection mold multi-cavity lotus root-shaped secondary runner device, comprising a cavity plate body (1), a main runner (2) is opened in the cavity plate body (1), a secondary runner, a gate (3) and a cavity (4) are opened on the cavity plate body (1), one end of the secondary runner communicates with the main runner (2), the other end of the secondary runner communicates with the gate (3), and the gate (3) communicates with the cavity (4), characterized in that: On the cavity plate body (1), a insert block groove (5) is provided at the position of the sub - runner. A runner insert block (6) is arranged in the insert block groove (5). An o - shaped runner (7) is provided on the runner insert block (6). The sub - runner is divided into a first - stage sub - runner (8) and a second - stage sub - runner (9). The first - stage sub - runner (8) and the second - stage sub - runner (9) are communicated through the o - shaped runner (7).

2. The multi-cavity lotus root-shaped secondary runner device of an injection mold according to claim 1, characterized in that: A through - hole (10) is provided in the runner insert block (6). The runner insert block (6) is fixed to the cavity plate body (1) by a fastener passing through the through - hole (10).

3. The multi-cavity lotus root-shaped secondary runner device for an injection mold according to claim 1, wherein: The runner insert block (6) is provided with a first connecting runner (11) on the left side of the o - shaped runner (7). One end of the first connecting runner (11) corresponds to the first - stage sub - runner (8), and the other end of the first connecting runner (11) and the o - shaped runner (7) are transitioned through an arc surface (12).

4. The multi-cavity lotus root-shaped secondary runner device for an injection mold according to claim 1, wherein: The runner insert block (6) is provided with a second connecting runner (13) on the right side of the o - shaped runner (7). One end of the second connecting runner (13) corresponds to the second - stage sub - runner (9), and the other end of the second connecting runner (13) and the o - shaped runner (7) are transitioned through an arc surface (12).

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