A hot runner structure

Abstract

The utility model provides a hot runner structure, including mould, be located in the mould inside and have the first runner hole's hot nozzle, be located in the hot nozzle end portion and have the second runner hole's seal glue cover, be located in the water transport cover of seal glue cover far from hot nozzle one side, the third runner hole is established in water transport cover inside to make first runner hole, second runner hole and third runner hole communicate in proper order, and the second runner hole, third runner hole place removes and is equipped with the valve needle, water transport cover circumference side has cooling water circulation subassembly, water transport cover is integrative arrangement, the utility model discloses simple structure can effectively reduce runner hole export forming temperature, increase forming crystallization rate.

Description

Technical Field

[0001] This utility model relates to the field of hot runner systems, and more particularly to a hot runner structure. Background Technology

[0002] Hot runner systems are heating components used in injection molds to inject molten plastic particles into the mold cavity. Hot runner molds are a novel construction that heats the runners and sprues of traditional or three-plate molds, eliminating the need to remove them after each molding cycle.

[0003] In the application of hot runner technology, the hot nozzle hot runner system is one of the commonly used hot runner systems. However, due to the slow crystallization rate of plastics, the difficulty of molding and processing, and the high molding temperature, existing hot nozzle structures are unable to achieve ideal molding results.

[0004] Meanwhile, existing needle valve hot nozzle structures, in order to achieve ideal performance, widely use high-performance precious metals, resulting in high costs. Needle valve hot nozzles also suffer from complex structures, high requirements for machining and installation precision, and imbalances in heating and heat conduction. Utility Model Content

[0005] The purpose of this invention is to provide a hot runner structure that is simple in structure, can effectively reduce the molding temperature at the outlet of the runner hole, and increase the molding crystallization rate.

[0006] To solve the above-mentioned technical problems, this utility model provides a hot runner structure, including a mold, a hot nozzle disposed inside the mold and having a first runner hole, a sealing sleeve disposed at the end of the hot nozzle and having a second runner hole, and a water jacket disposed on the side of the sealing sleeve away from the hot nozzle. The water jacket has a third runner hole inside, so that the first runner hole, the second runner hole and the third runner hole are connected in sequence. Valve needles are movably installed at the second runner hole and the third runner hole. The water jacket has a cooling water circulation assembly around its periphery. The water jacket is integrally formed.

[0007] Furthermore, a plurality of heating rings are arranged around the hot nozzle and the sealing sleeve, and a heat insulation sleeve is arranged outside the hot nozzle so that the heating rings are located between the hot nozzle and the heat insulation sleeve.

[0008] Furthermore, the sealing sleeve is threadedly fitted to the hot nozzle, and a heat insulation cap is provided between the sealing sleeve and the water jacket. The heat insulation cap has a through hole in the middle, and the through hole is located between the second flow channel hole and the third flow channel hole.

[0009] Furthermore, the cooling water circulation assembly includes an inlet channel and an outlet channel respectively opened on both sides of the mold, and a cooling cavity is opened between the inlet channel and the outlet channel, with the outer periphery of the water jacket located in the cooling cavity.

[0010] Furthermore, a first sealing ring and a second sealing ring are provided at intervals between the outer periphery of the water jacket and the mold, and the first sealing ring and the second sealing ring are respectively placed on both sides of the cooling cavity.

[0011] Furthermore, a retaining ring is snapped onto the outer periphery of the hot nozzle, and the end of the heat insulation sleeve abuts against the retaining ring.

[0012] Furthermore, a water jacket pressing block is arranged on the inner side of the mold to press the water jacket, and the arrangement direction of the first sealing ring and the second sealing ring is consistent with the pressing direction of the water jacket pressing block.

[0013] Furthermore, the water jacket has several lifting holes on the side facing the water jacket pressure block.

[0014] The beneficial effects of this utility model are as follows: By sequentially connecting the hot nozzle, sealing sleeve, and water jacket, the first flow channel hole, the second flow channel hole, and the third flow channel hole are connected in sequence. At this time, the molten plastic can flow along the first flow channel hole at the hot nozzle to the third flow channel hole of the water jacket for injection molding. The opening and closing state of the injection channel is controlled by the movement of the valve needle. At the same time, due to the cooling water circulation components around the water jacket, the water jacket is cooled by the cooling water in real time, thereby allowing the material temperature inside the water jacket to be rapidly cooled by the cooling water, improving cooling efficiency, shortening the overall cooling time of the plastic, thus accelerating the entire production cycle, and improving the quality and smoothness of the product molding. In addition, since the water jacket is set as an integral piece, it has the advantage of simple structure while having the functions of guiding the injection flow channel and rapidly cooling the material temperature, making it easier to maintain and disassemble. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Reference numerals: 1. Hot nozzle; 2. Heat insulation sleeve; 3. Water jacket pressing block; 4. Heating ring; 5. Water jacket; 6. First sealing ring; 7. Retaining ring; 8. Water inlet channel; 9. Mold; 10. Sealing sleeve; 11. Cooling cavity; 12. Heat insulation cap; 13. Valve needle; 14. Second sealing ring; 15. Cooling cavity; 16. Water outlet channel. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the present utility model.

[0018] Those skilled in the art should understand that in the disclosure of this utility model, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as a limitation of this utility model.

[0019] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0020] like Figure 1 The present invention provides a hot runner structure, including a mold 9, a hot nozzle 1 disposed inside the mold 9 and having a first runner hole, a sealing sleeve 10 disposed at the end of the hot nozzle 1 and having a second runner hole, and a water-cooling sleeve 5 disposed on the side of the sealing sleeve 10 away from the hot nozzle 1. The water-cooling sleeve 5 has a third runner hole inside, so that the first runner hole, the second runner hole and the third runner hole are connected in sequence. Valve needles 13 are movably installed at the second runner hole and the third runner hole. The water-cooling sleeve 5 has a cooling water circulation assembly around its periphery. The water-cooling sleeve 5 is integrally formed.

[0021] The sequential connection of the hot nozzle, sealing sleeve, and water jacket allows the first, second, and third flow channels to be connected in sequence. The molten plastic flows along the first flow channel at the hot nozzle to the third flow channel in the water jacket for injection molding. The opening and closing of the injection channel is controlled by the movement of a valve needle. Simultaneously, the cooling water circulation components around the water jacket ensure continuous cooling, rapidly lowering the material temperature within the jacket, improving cooling efficiency, shortening the overall cooling time of the plastic, accelerating the production cycle, and improving the quality and smoothness of the molded product. Furthermore, the integrated design of the water jacket provides a simple structure, making it easier to maintain and disassemble, while simultaneously guiding the injection flow and rapidly cooling the material.

[0022] The valve needle is used in a similar manner to existing hot runner valve needles, and will not be described in detail here.

[0023] Preferably, a plurality of heating rings 4 are arranged around the hot nozzle 1 and the sealing sleeve 10, and the heat insulation sleeve 2 is arranged outside the hot nozzle 1 so that the heating rings 4 are located between the hot nozzle 1 and the heat insulation sleeve 2.

[0024] Specifically, several heating coils are used to uniformly heat the outer periphery of the hot nozzle and the sealing sleeve, so that the medium can maintain uniform heat when it flows and is transported at the hot nozzle and the sealing sleeve, avoiding premature condensation of the medium. At the same time, with the setting of the heat insulation sleeve, the heating effect of the heating coils on the hot nozzle can be more stable, preventing heat from escaping to the outside of the hot nozzle and improving heating efficiency and effect.

[0025] The heating coil can be either electrically heated or induction heated.

[0026] Preferably, the sealing sleeve 10 is threadedly engaged with the hot nozzle 1, and a heat insulation cap 12 is provided between the sealing sleeve 10 and the water jacket 5. The heat insulation cap 12 has a through hole in the middle, and the through hole is located between the second flow channel hole and the third flow channel hole.

[0027] Specifically, by tightening the sealing sleeve thread to the hot nozzle, the connection between the sealing sleeve and the hot nozzle becomes more secure and easier to install and remove, while ensuring the connection and sealing between the first flow channel hole and the second flow channel hole.

[0028] Meanwhile, the heat insulation cap provides insulation between the sealing sleeve and the water jacket, ensuring that the heat at the hot nozzle can only be maintained between the hot nozzle and the sealing sleeve. This increases the heat of the medium at the first and second flow channel holes, while maintaining the cooling effect of the cooling water at the third flow channel hole. This simultaneously prevents the medium from condensing prematurely and achieves rapid cooling at the outlet.

[0029] In one embodiment of this solution, one end of the hot nozzle has a stepped hole, which abuts against the sealing sleeve to ensure a stable connection between the two.

[0030] Preferably, the cooling water circulation assembly includes an inlet channel 81 and an outlet channel 16 respectively opened on both sides of the mold 9, and a cooling cavity 15 is opened between the inlet channel 8 and the outlet channel 16, with the outer periphery of the water jacket 5 located in the cooling cavity 15.

[0031] Specifically, cooling water enters the cooling chamber through the inlet channel, thereby cooling the water jacket in the cooling chamber and carrying away some of the heat carried by the medium at the third flow channel hole, so as to quickly reduce the temperature of the medium at the third flow channel hole. Then, the cooling water in the cooling chamber is discharged from the outlet channel to ensure stable circulation of cooling water and improve the cooling effect.

[0032] Both the inlet and outlet channels are connected to the external cooling water supply equipment to ensure the stability of the overall cooling water circulation path.

[0033] Preferably, a first sealing ring 6 and a second sealing ring 14 are provided at intervals between the outer periphery of the water jacket 5 and the mold 9, and the first sealing ring 6 and the second sealing ring 14 are respectively placed on both sides of the cooling cavity 15.

[0034] Specifically, the first and second sealing rings seal the position between the water jacket and the mold, and ensure the sealing effect on both sides of the cooling chamber, thereby preventing the cooling water from leaking out from the position between the water jacket and the mold, and improving the overall flow path stability of the cooling water circulation.

[0035] Preferably, a retaining ring 7 is snapped onto the outer periphery of the hot nozzle 1, and the end of the heat insulation sleeve 2 abuts against the retaining ring 7.

[0036] Specifically, the heat insulation sleeve is stopped and limited by a retaining ring to ensure its stable installation, thereby improving the heat insulation effect of the heat insulation sleeve on the heating coil.

[0037] In one embodiment of this solution, an annular groove is provided on the outer periphery of the hot nozzle, and the retaining ring is engaged in the annular groove to ensure the stability of the retaining ring itself, thereby ensuring the stable positioning of the retaining ring on the heat insulation sleeve.

[0038] The retaining ring can be made of elastic materials such as rubber.

[0039] Preferably, the inner side of the mold 9 is provided with a water jacket pressing block 3 for pressing the water jacket 5, and the arrangement direction of the first sealing ring 6 and the second sealing ring 14 is consistent with the pressing direction of the water jacket pressing block 3.

[0040] Specifically, after the water jacket and sealing sleeve are installed, the water jacket clamping block is pressed and fixed to the water jacket, so that the water jacket can be positioned and clamped by the water jacket clamping block, ensuring the stability of the water jacket relative to the mold and hot nozzle, thereby ensuring the stability of the flow path of each flow channel hole and the stability of the cooling water flow path.

[0041] Furthermore, since the arrangement direction of the first and second sealing rings is consistent with the pressing direction of the water jacket pressure block, the sealing rings can deform evenly under pressure, thereby effectively improving the fit and sealing reliability of the sealing interface.

[0042] Preferably, the water jacket 5 has several lifting holes on the side facing the water jacket pressing block 3.

[0043] Specifically, when connecting the water jacket pressing block and the water jacket, the water jacket is first lowered, and then the water jacket pressing block is pressed to clamp and position the water jacket. When disassembling the water jacket, the water jacket can be lifted by removing the water jacket pressing block and using the lifting holes to improve the ease of disassembly.

[0044] In one embodiment of this solution, the method for lifting the water jacket can be as follows: screw the bolt with the lifting ring into the lifting hole, and then lift the bolt through the lifting ring, thereby lifting the water jacket simultaneously. When the water jacket is in normal use, the bolt can be disassembled and removed to ensure stable contact between the water jacket and the water jacket pressure block.

[0045] This utility model is not limited to the above-described preferred embodiments. Anyone can derive other forms of products under the guidance of this utility model. However, regardless of any changes made in their shape or structure, any technical solution that is the same as or similar to this application falls within the protection scope of this utility model.

Claims

1. A hot runner structure, characterized in that: The device includes a mold (9), a hot nozzle (1) located inside the mold (9) and having a first flow channel hole, a sealing sleeve (10) located at the end of the hot nozzle (1) and having a second flow channel hole, and a water jacket (5) located on the side of the sealing sleeve (10) away from the hot nozzle (1). The water jacket (5) has a third flow channel hole inside, so that the first flow channel hole, the second flow channel hole and the third flow channel hole are connected in sequence. A valve needle (13) is movable at the second flow channel hole and the third flow channel hole. The water jacket (5) has a cooling water circulation assembly around its periphery. The water jacket (5) is integrally formed.

2. The hot runner structure according to claim 1, characterized in that: The hot nozzle (1) and the sealing sleeve (10) are provided with a number of heating rings (4) on their outer periphery, and the heat insulation sleeve (2) is provided outside the hot nozzle (1) so that the heating rings (4) are located between the hot nozzle (1) and the heat insulation sleeve (2).

3. The hot runner structure according to claim 1, characterized in that: The sealing sleeve (10) is threadedly fitted to the hot nozzle (1), and a heat insulation cap (12) is provided between the sealing sleeve (10) and the water jacket (5). The heat insulation cap (12) has a through hole in the middle, and the through hole is located between the second flow channel hole and the third flow channel hole.

4. The hot runner structure according to claim 1, characterized in that: The cooling water circulation assembly includes an inlet channel (81) and an outlet channel (16) respectively opened on both sides of the mold (9). A cooling cavity (15) is opened between the inlet channel (81) and the outlet channel (16). The outer periphery of the water jacket (5) is located in the cooling cavity (15).

5. The hot runner structure according to claim 4, characterized in that: The water jacket (5) is provided with a first sealing ring (6) and a second sealing ring (14) at intervals between its outer periphery and the mold (9), and the first sealing ring (6) and the second sealing ring (14) are respectively placed on both sides of the cooling cavity (15).

6. The hot runner structure according to claim 2, characterized in that: A retaining ring (7) is snapped onto the outer periphery of the hot nozzle (1), and the end of the heat insulation sleeve (2) abuts against the retaining ring (7).

7. The hot runner structure according to claim 5, characterized in that: The mold (9) is provided with a water jacket pressing block (3) inside, which is used to press the water jacket (5) tightly, and the first sealing ring (6) and the second sealing ring (14) are arranged in the same direction as the pressing direction of the water jacket pressing block (3).

8. The hot runner structure according to claim 7, characterized in that: The water jacket (5) has several lifting holes on the side facing the water jacket pressure block (3).

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