Sprue inlet structure of injection mold

Abstract

The utility model discloses a pouring gate structure of an injection mold, which comprises a pouring head, a double-thread middle-section feeding head and a filter sleeve, the double-thread middle-section feeding head is assembled and mounted at the top end of the pouring head in a threaded manner, the filter sleeve is detachably mounted in the double-thread middle-section feeding head, and an internal thread right-angle connector is assembled at the top end of the double-thread middle-section feeding head in a threaded manner; an annular flange is integrally formed at one end in the internal thread right-angle connector, and a pressing ring is installed at the position of an opening in the top end of the double-thread middle-section feeding head below the annular flange. According to the utility model, a molten material is injected into the filter sleeve of the double-thread middle-section feeding head by utilizing the internal thread right-angle joint, the molten material treated by the filter sleeve enters the pouring head, and the molten material is fed into a cavity channel of an injection mold by the equidirectional three-section type material injection structure at the bottom end of the pouring head.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, specifically to a gate structure for an injection mold. Background Technology

[0002] The sprue in an injection mold is primarily responsible for guiding molten plastic into the mold cavity, ensuring product filling and molding quality. Its core functions include controlling the speed and pressure of plastic flow to prevent defects such as porosity and shrinkage, while also helping to regulate mold temperature and ensure uniform cooling. Different types of sprues, such as straight-through, side-mounted, and embedded sprues, are selected based on mold structure and product requirements to achieve optimal filling. The sprue structure consists of runners, nozzles, and the sprue body. Properly designed dimensions and positions can reduce material waste and improve production efficiency. The feeding process begins with plastic granules being heated and melted in a plastic injection molding machine to form a uniform melt. This melt then enters the runner system through the nozzle and gradually flows into the mold cavity, completing the filling process. During this process, air is expelled to prevent bubble defects. Some molds are also equipped with cooling devices to control the temperature of the sprue area, ensuring uniform cooling and solidification of the plastic within the mold cavity. Finally, after cooling and molding, the mold is opened and the finished product is removed. However, in the current gate structure, when molten plastic granules are fed into the mold cavity, the molten material gathers in the nozzle and flows out from the end of the nozzle. However, the cross-sectional area of ​​the nozzle is small and the flow channel design is usually narrow, which causes the plastic melt to encounter greater flow resistance when passing through the nozzle. At this time, the diffusion speed of the molten material in the mold cavity is slow, especially under high viscosity materials or low flow rate conditions. The molten material is prone to accumulate or stagnate in the nozzle, forming "blockage" or "aggregation". On the one hand, in the deep part of the mold cavity or complex structural areas, defects such as incomplete filling, air holes, and shrinkage are prone to occur, affecting product quality. On the other hand, the slow diffusion of the molten material in the nozzle and cavity prolongs the overall injection molding time. Utility Model Content

[0003] The purpose of this utility model is to provide a gate structure for an injection mold, wherein the internal thread right-angle connector injects molten material into the filter sleeve of the double threaded middle section of the feed head, and the molten material after being processed by the filter sleeve enters the feed head, and the same-direction three-part injection structure at the bottom of the feed head sends the molten material into the cavity of the injection mold, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a gate structure for an injection mold, comprising a gate head, a double-threaded middle section feed head threadedly mounted on the top of the gate head, and a filter sleeve detachably mounted inside the double-threaded middle section feed head. The top of the double-threaded middle section feed head is threaded with an internally threaded right-angle connector. One end of the internally threaded right-angle connector is integrally formed with an annular retaining edge. A pressure ring is installed at the top opening of the double-threaded middle section feed head below the annular retaining edge. The upper surface of the pressure ring is in contact with the lower surface of the annular retaining edge. The bottom end of the gate head is integrally formed with a three-part injection structure in the same direction.

[0005] Preferably, the unidirectional three-part injection structure includes a centrally located material distribution pipe integrally formed at the bottom of the injection head and side expansion pipes integrally formed on the left and right outer walls of the centrally located material distribution pipe.

[0006] Preferably, the left and right outer walls of the centrally located material distribution pipe are integrally formed with wing plates, and through holes are provided on both sides of the wing plate surface.

[0007] Preferably, the angle between the extended line of the central axis of the central distribution pipe and the extended line of the central axis of the side expansion pipe is 15 to 30 degrees.

[0008] Preferably, the filter sleeve has an internal cavity for communicating with the internal thread right-angle connector, the outer wall of the cavity has a plurality of fully penetrating filter holes, the outer wall of the filter sleeve has a partition cavity for the molten material to flow out from the filter holes, and the lower outer wall of the filter sleeve has a return hole for connecting the double threaded middle section feed head and the partition cavity.

[0009] Preferably, the filter sleeve and the pressure ring are both made of alloy steel, and the inner diameter of the pressure ring is equal to the inner diameter of the filter sleeve.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: The gate structure of this injection mold utilizes an internally threaded right-angle connector to inject molten material into the filter sleeve of the double-threaded middle section of the inlet head. After being processed by the filter sleeve, the molten material enters the inlet head, and is then fed into the cavity of the injection mold by the unidirectional three-part injection structure at the bottom of the inlet head. Before entering the inlet head, the internally threaded right-angle connector effectively guides the molten material to flow along a predetermined path. Subsequently, after being processed by the filter sleeve, impurities, cold slabs, and unmelted particles are intercepted, preventing these impurities from entering the mold cavity. This reduces mold damage and finished product defects, making the molten material flowing into the mold cavity purer and filling more evenly. The appearance quality and dimensional stability of the molded parts are guaranteed. The three-way unidirectional injection structure at the bottom of the sprue evenly distributes the molten material to three outlets, forming a multi-point simultaneous filling effect. Multi-point injection shortens the filling time, avoids pressure concentration and uneven flow rate in a single channel, and significantly improves the injection speed. In addition, the three-way unidirectional injection structure avoids fluid accumulation or stagnation in a single channel, ensuring that the molten plastic remains continuous during the flow process and reducing blockages or cold spots caused by poor flow. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0012] Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 ;

[0013] Figure 3 This is a three-dimensional cross-sectional structural diagram of the present invention;

[0014] Figure 4 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 ;

[0015] Figure 5 This is a schematic diagram of the front cross-sectional structure of this utility model;

[0016] Figure 6 This is a three-dimensional structural diagram of the filter sleeve of this utility model.

[0017] In the diagram: 1. Inlet head; 2. Double-threaded mid-section inlet head; 3. Three-part unidirectional injection structure; 301. Centrally positioned distribution pipe; 302. Side expansion pipe; 303. Wing plate; 304. Through hole; 4. Filter sleeve; 401. Cavity; 402. Filter hole; 403. Partition cavity; 404. Return hole; 5. Pressure ring; 6. Internal threaded right-angle connector; 601. Annular retaining edge. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0019] Please see Figure 1-6 The present invention provides an embodiment of an injection mold gate structure, including a gate head 1, a double-threaded middle section feed head 2 with a threaded top of the gate head 1, and a filter sleeve 4 that can be detachably installed inside the double-threaded middle section feed head 2. The top of the double-threaded middle section feed head 2 is threaded with an internal threaded right-angle connector 6. One end of the internal threaded right-angle connector 6 is integrally formed with an annular flange 601. A pressure ring 5 is installed at the top opening of the double-threaded middle section feed head 2 below the annular flange 601. The upper surface of the pressure ring 5 is in contact with the lower surface of the annular flange 601. The bottom end of the gate head 1 is integrally formed with a three-part injection structure 3 in the same direction.

[0020] When the workers are assembling the inlet head 1, the double-threaded mid-section inlet head 2, the filter sleeve 4, and the internal threaded right-angle connector 6, the bottom end of the double-threaded mid-section inlet head 2 is threadedly connected to the top end of the inlet head 1, and the top end of the double-threaded mid-section inlet head 2 is threadedly connected to the bottom end of the internal threaded right-angle connector 6.

[0021] Before connecting the double-threaded mid-section feed head 2 and the internal threaded right-angle connector 6, the operator needs to put the filter sleeve 4 into the double-threaded mid-section feed head 2 with the bottom end of the filter sleeve 4 facing down, and place the pressure ring 5 on the upper end of the filter sleeve 4. After the double-threaded mid-section feed head 2 and the internal threaded right-angle connector 6 are screwed together, the annular flange 601 is used to press the pressure ring 5 and the filter sleeve 4 downward to make the filter sleeve 4 stably limited in the double-threaded mid-section feed head 2 and work stably.

[0022] The filter sleeve 4 has an internal cavity 401 for communication with the internal thread right-angle connector 6. The outer wall of the cavity 401 has several through-holes 402. The outer wall of the filter sleeve 4 has a partition 403 for molten material to flow out from the through-holes 402. The lower outer wall of the filter sleeve 4 has a return hole 404 for connecting the double-threaded feed head 2 and the partition 403. Both the filter sleeve 4 and the pressure ring 5 are made of alloy steel. The inner diameter is equal to the inner diameter of the filter sleeve 4. The molten material enters the cavity 401 of the filter sleeve 4, and the flowing molten material enters the cavity 403 between the filter sleeve 4 and the double-threaded middle section feed head 2 from the filter hole 402. The filtered molten material enters the sprue head 1 through the return hole 404 and the bottom opening of the double-threaded middle section feed head 2, and finally flows out from the same direction three-part injection structure 3. This avoids impurities clogging the flow channel and damaging the mold, and reduces the frequency of mold maintenance.

[0023] The three-part injection structure 3 includes a central material distribution pipe 301 integrally formed at the bottom of the injection head 1 and side expansion pipes 302 integrally formed on the left and right outer walls of the central material distribution pipe 301. Wing plates 303 are integrally formed on the left and right outer walls of the central material distribution pipe 301, and through holes 304 are provided on both sides of the surface of the wing plate 303.

[0024] The angle between the extended line of the central axis of the central distribution pipe 301 and the extended line of the central axis of the side expansion pipe 302 is 15 to 30 degrees. The molten material filtered by the filter sleeve 4 is then diverted by the central distribution pipe 301 and the side expansion pipe 302, so that the molten plastic material flows to different areas of the mold cavity at the same time, ensuring that the filling speed of each area is consistent and avoiding local cold spots, shrinkage cavities or gas retention.

[0025] In this embodiment, the internal thread right-angle connector 6 is first connected to the discharge end of the injection molding machine. At this time, the molten plastic flows out from the nozzle of the injection molding machine and enters the internal thread right-angle connector 6. The internal thread right-angle connector 6 changes the flow direction of the molten material, ensuring that the molten material smoothly enters the subsequent structure. The molten material flows into the double threaded middle section feed head 2 and is filtered by the filter sleeve 4. The filter sleeve 4 intercepts impurities, unmelted particles, or cold material blocks to ensure that the plastic in the subsequent flow channel is pure and flows smoothly. The filtered molten plastic enters the sprue head 1. The sprue head 1 and the three-way injection structure 3 divide the molten plastic into three paths and inject it into different areas of the injection mold cavity at the same time to form a multi-point, multi-path injection method, thereby shortening the mold filling time and improving the uniformity of mold filling.

Claims

1. A gate structure for an injection mold, characterized in that: The device includes a sprue (1), a double-threaded mid-section feed head (2) with the top thread of the sprue (1) being assembled and installed, and a filter sleeve (4) that can be detachably installed inside the double-threaded mid-section feed head (2). The top thread of the double-threaded mid-section feed head (2) is equipped with an internal threaded right-angle connector (6). One end of the internal threaded right-angle connector (6) is integrally formed with an annular flange (601). A pressure ring (5) is installed at the top opening of the double-threaded mid-section feed head (2) below the annular flange (601). The upper surface of the pressure ring (5) is in contact with the lower surface of the annular flange (601). The bottom end of the sprue (1) is integrally formed with a three-part injection structure (3) in the same direction.

2. The gate structure of an injection mold according to claim 1, characterized in that: The unidirectional three-part injection structure (3) includes a centrally located material distribution pipe (301) integrally formed at the bottom of the injection head (1) and side expansion pipes (302) integrally formed on the left and right outer walls of the centrally located material distribution pipe (301).

3. The gate structure of an injection mold according to claim 2, characterized in that: The left and right outer walls of the central distribution pipe (301) are integrally formed with wing plates (303), and through holes (304) are provided on both sides of the surface of the wing plate (303).

4. The gate structure of an injection mold according to claim 2, characterized in that: The angle between the extended line of the central axis of the central distribution pipe (301) and the extended line of the central axis of the side expansion pipe (302) is 15 to 30 degrees.

5. The gate structure of an injection mold according to claim 1, characterized in that: The filter sleeve (4) has a cavity (401) inside for communicating with the internal thread right angle connector (6). The outer wall of the cavity (401) has several fully penetrating filter holes (402). The outer wall of the filter sleeve (4) has a partition cavity (403) for the molten material to flow out from the filter holes (402). The lower outer wall of the filter sleeve (4) has a return hole (404) for connecting the double threaded middle section feed head (2) and the partition cavity (403).

6. The gate structure of an injection mold according to claim 5, characterized in that: The filter sleeve (4) and the pressure ring (5) are both made of alloy steel. The inner diameter of the pressure ring (5) is equal to the inner diameter of the filter sleeve (4).

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