Gate structure for injection mold

Abstract

The utility model discloses a gate structure of injection mold, specifically relates to injection mold technical field, and including fixed mold, the gate of fixed mold is fixed with the gate bushing, the bottom of one end of the gate of fixed mold is provided with the buffer board close to the gate bushing, and the lower runner pipe is fixed to one side of the gate of fixed mold close to injection slot, the movable mold, the upper runner pipe is fixed to one side of the gate of movable mold close to injection slot, and one end of upper runner pipe is fixed with the connecting ring, the device is through embedding semicircle ring cutting blade in the connecting ring, realizes the automatic cutting function in the mould, and the semicircle ring structure is installed with the connecting ring and adopts the embedded type, ensures that the knife edge plane and the connecting ring side wall keep the same vertical plane, and the cutting blade is directly fixed on the connecting ring of movable mold, moves with the mould in the mold opening process, does not need to additionally add the drive mechanism, and the structure is simple and reliable, provides the buffering effect through the buffer board when the mold closes, and increases the service life of cutting blade.

Description

Technical Field

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

[0002] Injection molding, as a core process in modern plastic product manufacturing, directly impacts the quality, production efficiency, and cost control of plastic products. In injection mold structures, the gate, as a crucial component connecting the runner system to the product cavity, has a decisive influence on the stability of the injection molding process, product molding quality, and subsequent processing steps due to its rational structural design. With the increasing demands for automation and high-efficiency production in the manufacturing industry, optimizing and innovating gate structures has become an important direction for the development of injection mold technology.

[0003] Traditional injection mold gate structures typically employ a fixed design, where the gate sleeve on the fixed mold and the corresponding component on the moving mold cooperate to form an injection channel. After injection molding is completed, the product and the runner system remain connected through the gate, requiring subsequent separation processes to obtain the final product. During this process, the plastic at the gate area forms a connecting bridge after cooling and solidification, which needs to be cut and separated manually or with specialized equipment.

[0004] When the above-mentioned device is in use, the gate separation process not only increases the complexity of the production process, but also requires additional labor costs and equipment resources, reducing the overall production efficiency. In addition, manual cutting operation makes it difficult to ensure the flatness of the gate cut surface, which can easily produce quality defects such as bevels and burrs. At the same time, due to the small cross-section of the gate, the plastic is prone to premature solidification due to excessive heat dissipation during injection molding, causing gate blockage and affecting the continuity of production. Utility Model Content

[0005] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a gate structure for injection molds, which can effectively solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] This utility model provides a gate structure for an injection mold, including a fixed mold, a gate sleeve fixed at the gate of the fixed mold, a buffer plate provided at the bottom of the gate of the fixed mold near the gate sleeve, and a runner pipe fixed at the gate of the fixed mold near the injection tank.

[0008] The moving mold has an upper runner pipe fixed at the gate near the injection tank. A connecting ring is fixed at one end of the upper runner pipe, and a cutting blade is fixed inside the connecting ring.

[0009] Furthermore, the cutting blade is arranged in a semi-circular shape, and the cutting blade is located at the bottom of the connecting ring and embedded in the connecting ring. The cut of the cutting blade and one side of the connecting ring are located on the same vertical plane.

[0010] Furthermore, a placement groove is provided in the middle of the top of the buffer plate. The placement groove is used in conjunction with the outer wall of the connecting ring, and the width of the connecting ring is adapted to the width of the buffer plate.

[0011] Furthermore, the lower flow channel and the upper flow channel are used together, and the lower flow channel and the upper flow channel are hollow cylindrical after they come into contact.

[0012] Furthermore, the gate sleeve includes a heat-conducting outer shell, which is hollow, and an electric heating ring is fixed inside the heat-conducting outer shell. The electric heating ring is a small heating coil, and multiple electric heating rings are provided.

[0013] Furthermore, multiple heating rings are connected in series and arranged at equal intervals. Wires are connected to the series interfaces of the multiple heating rings, and a heat insulation sleeve is provided outside the wires. The heat insulation sleeve is a high-temperature resistant silicone resin glass fiber sleeve.

[0014] The technical solution provided by this utility model has the following advantages compared with the known prior art:

[0015] 1. This application achieves automatic in-mold cutting by embedding a semi-circular cutting blade inside the connecting ring. The semi-circular structure and the connecting ring are embedded to ensure that the cutting edge plane and the side wall of the connecting ring are in the same vertical plane. The cutting blade is directly fixed on the connecting ring of the moving mold and moves with the mold during the mold opening process. No additional drive mechanism is required. The structure is simple and reliable. When the mold is closed, the buffer plate provides a buffering effect and increases the service life of the cutting blade.

[0016] 2. This application achieves uniform heating within the heat-conducting outer shell through multiple heating rings, combined with a highly thermally conductive beryllium copper or aluminum alloy outer shell for uniform external heating. By heating the sprue bushing, it ensures that the molten plastic maintains optimal flow conditions as it flows through the sprue channel. Active heat preservation fundamentally solves the problem of plastic condensation and blockage caused by excessive heat dissipation. The conductors are externally insulated with high-temperature resistant silicone resin fiberglass tubing, ensuring the safety and service life of the heating system. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the gate structure of the fixed mold of this utility model;

[0020] Figure 3 This is a schematic diagram of the structure of the moving mold gate of this utility model;

[0021] Figure 4 This is a cross-sectional schematic diagram of the gating sleeve structure of this utility model.

[0022] The labels in the diagram represent:

[0023] 1. Fixed mold; 2. Moving mold; 30. Sprue bushing; 31. Heat-conducting shell; 32. Heating ring; 33. Wire; 4. Injection nozzle; 5. Buffer plate; 6. Lower runner pipe; 7. Upper runner pipe; 8. Connecting ring; 9. Cutting blade. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0025] The following is in conjunction with the appendix Figures 1-4 This application will be described in further detail.

[0026] This application discloses a gate structure for an injection mold, including a fixed mold 1, a gate sleeve 30 fixed at the gate of the fixed mold 1, a buffer plate 5 at the bottom of the gate of the fixed mold 1 near the gate sleeve 30, and a downflow pipe 6 fixed at the gate of the fixed mold 1 near the injection tank.

[0027] The moving mold 2 has an upper runner pipe 7 fixed at the gate near the injection tank. A connecting ring 8 is fixed at one end of the upper runner pipe 7. A cutting blade 9 is fixed inside the connecting ring 8. After the fixed mold 1 and the moving mold 2 are closed, they together form the injection cavity of the product.

[0028] Reference Appendix Figure 3 The cutting blade 9 is arranged in a semi-circular ring shape and is located at the bottom of the connecting ring 8 and is embedded in the connecting ring 8. The cutting edge of the cutting blade 9 is on the same vertical plane as one side of the connecting ring 8. The cutting blade 9 is made of high-hardness tool steel and is heat-treated. The cutting edge is located on the outside. After injection molding is completed, when the moving mold 2 moves upward, the connecting ring 8 moves together, driving the cutting blade 9 to cut the high-temperature plastic connected at the gate.

[0029] Reference Appendix Figure 2 The buffer plate 5 has a placement groove in the middle of its top, which is used in conjunction with the outer wall of the connecting ring 8. The width of the connecting ring 8 is matched with the width of the buffer plate 5. A cavity is provided in the fixed mold 1, and a compression spring is provided at the bottom of the cavity. The buffer plate 5 is installed on the compression spring. When the mold is closed, the buffer plate 5 buffers the connecting ring 8 to prevent the cutting blade 9 and the connecting ring 8 from being deformed by long-term compression. When the mold is closed, the connecting ring 8 enters the placement groove of the buffer plate 5 and connects to the injection nozzle 4, the lower flow channel pipe 6, and the upper flow channel pipe 7.

[0030] Reference Appendix Figure 2 and 3 The lower runner 6 and the upper runner 7 are used together. When the lower runner 6 and the upper runner 7 come into contact, they form a hollow cylinder. When the mold is closed, the lower runner 6 and the upper runner 7 close to form a hollow pipe for conveying the heated injection molding material.

[0031] Reference Appendix Figure 2 and 4 The sprue sleeve 30 includes a heat-conducting shell 31, which is made of beryllium copper or aluminum alloy and is hollow. An electric heating ring 32 is fixed inside the heat-conducting shell 31. The electric heating ring 32 is a small heating coil, and multiple electric heating rings 32 are provided. The electric heating ring 32 generates heat when energized and is transferred through the heat-conducting shell 31 to heat the dispensing nozzle 4. This ensures that the molten material injected from the dispensing nozzle 4 remains molten in the sprue channel, fundamentally preventing the dispensing nozzle 4 from being blocked due to the cooling of the raw material.

[0032] Reference Appendix Figure 2 and 4 Multiple heating rings 32 are connected in series and arranged at equal intervals. The series connection interface of the multiple heating rings 32 is connected to a wire 33. The wire 33 is covered with a heat insulation sleeve, which is a high-temperature resistant silicone resin glass fiber sleeve. The wire 33 is connected to the series connection interface of the heating rings 32 for connecting to an external temperature control power supply. The wire 33 is covered with a heat insulation sleeve made of high-temperature resistant silicone resin glass fiber sleeve to prevent high temperature damage to the wire and ensure safety.

[0033] The workflow of this utility model is as follows:

[0034] First, during mold closing, the moving mold 2 moves downwards and tightly closes with the fixed mold 1. At this time, the upper runner 7 and the lower runner 6 connect to form a complete cylindrical runner. Simultaneously, the connecting ring 8 is embedded in the placement groove of the buffer plate 5 under the action of the mold closing force. The compression spring below the buffer plate 5 is compressed and provides continuous preload force to ensure mold sealing. The cutting edge of the cutting blade 9 is completely hidden in the cavity between the connecting ring 8 and the buffer plate 5. During injection molding, the heating ring 32 is energized and heated, and the gate is heated through the heat-conducting shell 31. The sprue 30 is kept at a constant temperature. The molten plastic is injected from the injection nozzle 4 under high pressure. After flowing through the constant temperature sprue 30, it enters the runner composed of the lower runner pipe 6 and the upper runner pipe 7. Finally, it smoothly fills the injection groove of the mold. After cooling, the product is shaped and the moving mold 2 is moved upward, which drives the connecting ring 8 and the cutting blade 9 to rise synchronously. At this time, the semi-circular cutting blade 9 contacts and cuts the solidified sprue material. Finally, the moving mold 2 returns to its original position and the material that has been injected into the mold can be taken out.

[0035] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of this utility model.

Claims

1. A gate structure for an injection mold, characterized in that: include: A fixed mold (1) is provided with a gate sleeve (30) at the gate of the fixed mold (1), and a buffer plate (5) is provided at the bottom of the gate of the fixed mold (1) near the gate sleeve (30). A downflow pipe (6) is fixed at the gate of the fixed mold (1) near the injection tank. The moving mold (2) has an upper runner pipe (7) fixed at the gate near the injection tank. A connecting ring (8) is fixed at one end of the upper runner pipe (7), and a cutting blade (9) is fixed inside the connecting ring (8).

2. The gate structure of an injection mold according to claim 1, characterized in that: The cutting blade (9) is arranged in a semi-circular shape, and the cutting blade (9) is located at the bottom of the connecting ring (8) and is embedded in the connecting ring (8). The cut of the cutting blade (9) and one side of the connecting ring (8) are located in the same vertical plane.

3. The gate structure of an injection mold according to claim 1, characterized in that: The buffer plate (5) has a placement groove in the middle of its top. The placement groove is used in conjunction with the outer wall of the connecting ring (8), and the width of the connecting ring (8) is compatible with the width of the buffer plate (5).

4. The gate structure of an injection mold according to claim 1, characterized in that: The lower flow channel (6) and the upper flow channel (7) are used together, and the lower flow channel (6) and the upper flow channel (7) are hollow cylindrical after they come into contact.

5. The gate structure of an injection mold according to claim 1, characterized in that: The gate sleeve (30) includes a heat-conducting shell (31), which is hollow. A heating ring (32) is fixed inside the heat-conducting shell (31). The heating ring (32) is a small heating coil, and multiple heating rings (32) are provided.

6. The gate structure of an injection mold according to claim 5, characterized in that: Multiple heating rings (32) are connected in series and arranged at equal intervals. A wire (33) is connected to the series interface of the multiple heating rings (32). A heat insulation sleeve is provided on the outside of the wire (33). The heat insulation sleeve is a high-temperature resistant silicone resin glass fiber sleeve.

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