Special hot nozzle structure for single valve scalding material

Abstract

The utility model belongs to hot runner injection moulding technical field, especially is related to a single valve is with easy scald material special hot nozzle structure. The outer wall surface of hot nozzle body is equipped with heater, thermocouple, the hot nozzle body is equipped with valve needle in the flow channel hole of integral gate bar, the integral gate bar includes integrally formed first section body, second section body, the first section body is screwed in the hot nozzle cavity of hot nozzle body, the second section body is located outside the hot nozzle cavity, the second section body is equipped with the copper ring of heat dissipation. The second section body of integral gate bar adds beryllium copper heat dissipation copper ring, its copper ring radial surface II, copper ring axial locating surface II, copper ring radial surface III and mould plate closely cooperate and contact, form high -efficient heat dissipation channel, can quickly export the heat of the gate place gathered, make the gate place glue temperature rapidly drop to the moulding temperature of adaptation, fundamentally solve the gate scald problem of low temperature easy scald material, effectively reduce product defective rate, greatly improve product forming quality and consistency.

Description

Technical Field

[0001] This utility model belongs to the field of hot runner injection molding technology, and in particular relates to a special hot nozzle structure for single-valve materials that are prone to burns. Background Technology

[0002] Hot runner systems maintain the molten plastic in the runner and gate by heating. Because heating rods and coils are located near or in the center of the runner, the entire runner from the injection molding machine nozzle to the gate is kept at a high temperature, keeping the plastic molten. After shutdown, there's no need to open the runner to remove the solidified material; simply reheat the runner to the required temperature before restarting. Hot runner technology offers advantages such as saving raw materials, reducing costs, shortening molding cycles, improving machine efficiency, enhancing product surface quality and mechanical properties, and improving the aesthetics of injection molded products. However, with the widespread application of hot runner technology, various defects have also emerged to varying degrees in some high-quality plastic parts applications. Different products and mold structures have different requirements. To meet customers' higher product demands and improve market competitiveness, hot runner systems are continuously developing new structures to satisfy customer product needs.

[0003] A typical hot runner structure consists of a hot runner body, a nozzle tip, a gate seal or sealing ring, a heater, and a thermocouple. The nozzle body is typically made of steel, the nozzle tip of beryllium copper or chromium copper, and the sealing ring or gate seal of stainless steel. The beryllium copper material at the nozzle tip is used to increase thermal conductivity, allowing the heater temperature to be more easily transferred to the gate to balance the plastic temperature. However, PP molding temperatures are 160-170°C, and most commonly used plastics have molding temperatures above 200°C, some even reaching 250-300°C. Therefore, using the same hot runner structure for all components can cause gate burns.

[0004] Therefore, the aforementioned problems urgently need to be addressed. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a special hot nozzle structure for single-valve materials prone to burns.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: A special hot nozzle structure for single-valve materials prone to burns includes a hot nozzle body and an integrated gate connector connected to the hot nozzle body. The outer wall of the hot nozzle body is provided with a heater and a thermocouple. A valve needle is provided in the flow channel hole of the hot nozzle body and the integrated gate connector. The integrated gate connector includes an integrally formed first section and a second section. The first section is threadedly connected to the hot nozzle cavity of the hot nozzle body, and the second section is located outside the hot nozzle cavity. A heat dissipation copper ring is fitted on the second section.

[0007] Furthermore, the heat dissipation copper ring contacts and engages with the mold to reduce the temperature of the molding material at the gate.

[0008] Furthermore, the inner circumferential surface of the hot nozzle cavity is sequentially provided with a hot nozzle radial surface, a hot nozzle axial positioning surface I, an internal thread, and a hot nozzle axial positioning surface II; the outer circumferential surface of the first segment is sequentially provided with a first radial surface, a first axial positioning surface I, an external thread, and a first axial positioning surface II; the internal thread and the external thread are threadedly engaged, the hot nozzle radial surface is in contact with the first radial surface, the hot nozzle axial positioning surface I is in contact with the first axial positioning surface I, and the hot nozzle axial positioning surface II is in contact with the first axial positioning surface II.

[0009] Furthermore, the outer peripheral surface of the second segment is provided with a second radial surface and a second axial positioning surface in sequence; one end face of the heat dissipation copper ring is provided with a copper ring radial surface I that contacts and cooperates with the second radial surface, and the inner peripheral surface of the heat dissipation copper ring is provided with a copper ring axial positioning surface I that contacts and cooperates with the second axial positioning surface.

[0010] Furthermore, the outer circumferential surface of the heat dissipation copper ring is sequentially provided with a copper ring radial surface II, a copper ring axial positioning surface II, and a copper ring radial surface III provided on the other end face of the heat dissipation copper ring; the copper ring radial surface II, the copper ring axial positioning surface II, and the copper ring radial surface III are in contact with the mold plate surface of the mold.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This application eliminates the traditional high thermal conductivity beryllium copper nozzle tip and replaces it with a stainless steel integrated gate, reducing heat conduction from the heater of the hot nozzle body to the gate from the source and optimizing the heat transfer path structurally. A beryllium copper heat dissipation ring is added to the second section of the integrated gate, and its radial surface II, axial positioning surface II, and radial surface III are in close contact with the mold plate to form an efficient heat dissipation channel, which can quickly dissipate the heat accumulated at the gate and rapidly reduce the temperature of the rubber material at the gate to the appropriate molding temperature. This fundamentally solves the problem of gate burns on materials that are prone to burns at low temperatures, effectively reduces the product defect rate, and significantly improves the product molding quality and consistency.

[0012] 2. The structure of this application is simple and ingenious, and the processing flow is convenient, which reduces production and maintenance costs. At the same time, it accurately meets the customer's special needs for hot runners of materials that are prone to burns at low temperatures, fills the gap in related technology applications, and has significant technological leadership and market competitiveness.

[0013] 3. Regarding service life, the one-piece stainless steel gating nozzle tip exhibits superior wear and corrosion resistance compared to beryllium copper tip. Over long-term use, this reduces the frequency of component replacement due to material wear or corrosion, extending the overall service life of the hot runner, lowering equipment maintenance costs and downtime, and improving production efficiency. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the hot nozzle body structure of this utility model; Figure 3 This is a schematic diagram of the integrated gating mechanism of this utility model; Figure 4 This is a schematic diagram of the heat dissipation copper ring structure of this utility model. Detailed Implementation

[0015] 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 embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0016] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0017] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort prior to the description are within the scope of protection of this utility model.

[0018] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0019] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0020] like Figure 1-4 As shown: A special hot nozzle structure for single-valve materials prone to burns includes a hot nozzle body 1 and an integrated gate 3 connected to the hot nozzle body 1. The outer wall of the hot nozzle body 1 is provided with a heater 2 and a thermocouple 6. A valve needle 5 is provided in the flow channel hole of the hot nozzle body 1 and the integrated gate 3. The integrated gate 3 includes an integrally formed first section 38 and a second section 39. The first section 38 is threadedly connected to the hot nozzle cavity 15 of the hot nozzle body 1, and the second section 39 is located outside the hot nozzle cavity 15. A heat dissipation copper ring 4 is sleeved on the second section 39.

[0021] The heat dissipation copper ring 4 is installed on the second section 39 of the integrated gating nozzle 3, complementing the stainless steel integrated gating nozzle 3. The integrated gating nozzle 3 reduces heat conduction to the gating, while the heat dissipation copper ring 4 specifically dissipates accumulated heat. Together, they form a dual protection of "heat control + heat dissipation," precisely matching the temperature control requirements of materials prone to burns at low temperatures, avoiding the limitations of single heat-conducting components in traditional structures. This structural cooperation achieves efficient heat dissipation, simplifying the overall structure of the hot runner, reducing processing and maintenance costs associated with additional heat dissipation components, and ensuring the stability of heat dissipation performance. This provides strong support for consistent product quality in mass production, further strengthening the technological advantages of hot runners in the field of low-temperature material molding.

[0022] The integrated gate nozzle 3 utilizes a one-piece stainless steel structure for heat conduction control. Compared to traditional beryllium copper nozzle tips, this significantly reduces the heat transfer efficiency from the heater 2 on the hot nozzle body 1 to the gate. This lays the foundation for precise temperature control at the gate, especially suitable for low-temperature, easily scalded materials such as PP, avoiding gate burns caused by excessive heat transfer. The integrated gate nozzle 3 eliminates the assembly gap between the nozzle tip and the gate nozzle in traditional modular structures, reducing the risk of material leakage that may occur due to component splicing and improving the overall sealing performance of the hot nozzle. The integrated gate nozzle 3 design greatly simplifies the manufacturing process, reducing the complex procedures and precision control requirements of traditional multi-component assembly, and lowering the processing difficulty and cost during production. Simultaneously, the simplified structure makes subsequent maintenance more convenient, reducing the cumbersome steps of component replacement, helping to improve the uptime of production equipment, and providing a reliable guarantee for large-scale production.

[0023] Furthermore, the heat dissipation copper ring 4 contacts the mold to reduce the temperature of the molding material at the gate.

[0024] In terms of heat dissipation efficiency, the heat dissipation copper ring 4 is made of beryllium copper with high thermal conductivity, which has excellent thermal conductivity and can quickly absorb excess heat accumulated at the gate.

[0025] Furthermore, the inner circumferential surface of the hot nozzle cavity 15 is sequentially provided with a hot nozzle radial surface 11, a hot nozzle axial positioning surface I 12, an internal thread 13, and a hot nozzle axial positioning surface II 14; the outer circumferential surface of the first segment 38 is sequentially provided with a first radial surface 31, a first axial positioning surface I 32, an external thread 33, and a first axial positioning surface II 34; the internal thread 13 and the external thread 33 are threadedly engaged, the hot nozzle radial surface 11 and the first radial surface 31 are in contact engagement, the hot nozzle axial positioning surface I 12 and the first axial positioning surface I 32 are in contact engagement, and the hot nozzle axial positioning surface II 14 and the first axial positioning surface II 34 are in contact engagement.

[0026] The threaded engagement of the internal thread 13 and the external thread 33 ensures that the first section body 38 and the hot nozzle cavity 15 are not prone to loosening under high-pressure injection molding. At the same time, the tight contact of multiple radial and axial positioning surfaces further restricts the relative displacement of the two in the radial and axial directions, effectively resisting the impact and vibration generated during injection molding, significantly improving the fatigue resistance of the overall structure, and reducing the risk of production failure due to connection failure.

[0027] The fit between the radial surface 11 and the first radial surface 31 of the hot nozzle ensures their coaxiality in the radial direction, preventing poor material flow or localized wear caused by eccentricity. Meanwhile, the dual axial positioning of the hot nozzle axial positioning surface I12 and the first axial positioning surface I32, and the hot nozzle axial positioning surface II14 and the first axial positioning surface II34, precisely controls the axial installation position of the first section 38 within the hot nozzle cavity 15, ensuring the relative positional accuracy of the integrated gate 3 and the hot nozzle body 1. This provides a foundation for stable material flow and uniform temperature distribution, contributing to improved product molding consistency. This multi-dimensional fit structure effectively seals the gap between the integrated gate 3 and the hot nozzle body 1, reducing the risk of material leakage at assembly seams, avoiding material waste and equipment contamination due to leakage, and further ensuring production stability and cleanliness.

[0028] Furthermore, the outer circumferential surface of the second segment 38 is sequentially provided with a second radial surface 36 and a second axial positioning surface 37; one end face of the heat dissipation copper ring 4 is provided with a copper ring radial surface I41 that contacts and engages with the second radial surface 36, and the inner circumferential surface of the heat dissipation copper ring 4 is provided with a copper ring axial positioning surface I45 that contacts and engages with the second axial positioning surface 37. The second segment 38 is also provided with a wrench position 35, which is used to lock the one-piece gate screw 3 by turning the wrench position 35 with a tool.

[0029] The fit between the radial surface I41 and the second radial surface 36 of the copper ring ensures the precise radial position of the heat dissipation copper ring 4 on the second segment 38, preventing eccentricity or offset and ensuring uniform contact area between the heat dissipation copper ring 4 and the template, laying the foundation for stable heat transfer. Meanwhile, the fit between the axial positioning surface I45 and the second axial positioning surface 37 of the heat dissipation copper ring 4 strictly limits its axial position, ensuring accurate contact with the template and preventing positional deviations from affecting heat dissipation. This tight contact minimizes the gap between the second segment 39 and the heat dissipation copper ring 4, reducing thermal resistance. Heat can be transferred more smoothly from the second segment 39 to the heat dissipation copper ring 4, and then dissipated through the contact between the heat dissipation copper ring 4 and the template, significantly improving overall heat dissipation efficiency and further ensuring that the temperature of the resin at the gate can quickly drop to a suitable range, effectively preventing product burns. The combination of the two provides a good fixation for the heat dissipation copper ring 4. During the injection molding process, it can effectively resist vibration and impact, prevent the heat dissipation copper ring 4 from loosening or shifting, and ensure that it is always in the best heat dissipation position, thereby maintaining stable heat dissipation performance and ensuring the consistency of product molding quality.

[0030] Furthermore, the outer circumferential surface of the heat dissipation copper ring 4 is provided with a copper ring radial surface II 42, a copper ring axial positioning surface II 43, and a copper ring radial surface III 44 on the other end face of the heat dissipation copper ring 4 in sequence; the copper ring radial surface II 42, the copper ring axial positioning surface II 43, and the copper ring radial surface III 44 are in contact with the mold plate surface of the mold.

[0031] Its unique three-sided bonding design allows it to form a large-area close contact with the template, creating an efficient heat dissipation channel. This synergistic mechanism of "heat absorption-conduction-extraction" can quickly transfer heat from the gate to the mold, achieving a rapid drop in the temperature of the material and providing a core guarantee against burns from low-temperature materials.

[0032] When using: Heater 2 and thermocouple 6 are standard components, manufactured using standard processing methods, with unchanged processing technology and characteristic requirements. Heat nozzle body 1, integrated gate 3, and heat dissipation copper ring 4 are all non-standard structures.

[0033] After processing, during installation: First, install the standard accessories such as heater 2, thermocouple 6, and retaining ring; Second, install the integrated sprue 3, tightening it by connecting the external thread 33 of the integrated sprue 3 to the internal thread 13 of the hot nozzle body 1. The radial surface 11 of the hot nozzle body 1 and the first radial surface 31 of the integrated sprue 3 are pressed together to prevent glue leakage. The axial positioning surfaces I12 and II14 of the hot nozzle body 1 are respectively engaged with the first axial positioning surfaces I32 and II34 of the integrated sprue 3 to ensure axial concentricity and prevent glue leakage; Third, install the heat dissipation copper ring 4 on the second section 38 of the integrated sprue 3. The radial surface I41 and axial positioning surface I45 of the heat dissipation copper ring 4 are engaged with the second radial surface 36 and the second axial positioning surface 37 of the second section 38 for heat dissipation. The heat nozzle is installed into the mold. The radial surface II42, axial positioning surface II43, and radial surface III44 of the heat dissipation copper ring 4 mate with the mold surface to dissipate heat and prevent burns.

[0034] During injection molding, the rubber compound enters the branch channel of the single-valve injection nozzle through the ball head and nozzle head of the injection molding machine, and then enters the branch channel of the hot nozzle body 1, eventually converging into the main flow channel. The rubber compound is heated by the nozzle and the hot nozzle heater before entering the integrated gate 3. If the heated rubber compound overheats, it is cooled by the heat dissipation structure to prevent product burns and improve product quality.

[0035] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above embodiments. Those skilled in the art can make various modifications or variations to the present invention without departing from the technical concept of the present invention, and such modifications or variations naturally fall within the protection scope of the present invention.

Claims

1. A special heating nozzle structure for single-valve materials prone to burns, characterized in that: It includes a hot nozzle body (1) and an integrated gating valve (3) connected to the hot nozzle body (1). The outer wall surface of the hot nozzle body (1) is provided with a heater (2) and a thermocouple (6). The flow channel holes of the hot nozzle body (1) and the integrated gating valve (3) are provided with valve needles (5). The integrated gating nozzle (3) includes an integrally formed first section (38) and a second section (39). The first section (38) is threadedly connected to the hot nozzle cavity (15) of the hot nozzle body (1), and the second section (39) is located outside the hot nozzle cavity (15). A heat dissipation copper ring (4) is fitted on the second section (39).

2. The single-valve heat nozzle structure for easily scalded materials according to claim 1, characterized in that: The heat dissipation copper ring (4) is in contact with the mold to reduce the temperature of the molding material at the gate.

3. The single-valve heat nozzle structure for easily scalded materials according to claim 2, characterized in that: The inner circumferential surface of the hot nozzle cavity (15) is provided with a hot nozzle radial surface (11), a hot nozzle axial positioning surface I (12), an internal thread (13), and a hot nozzle axial positioning surface II (14) in sequence. The outer peripheral surface of the first segment (38) is provided with a first radial surface (31), a first axial positioning surface I (32), an external thread (33), and a first axial positioning surface II (34) in sequence. The internal thread (13) is threadedly engaged with the external thread (33), the radial surface (11) of the hot nozzle is in contact with the first radial surface (31), the axial positioning surface I (12) of the hot nozzle is in contact with the first axial positioning surface I (32), and the axial positioning surface II (14) of the hot nozzle is in contact with the first axial positioning surface II (34).

4. The single-valve heat nozzle structure for easily scalded materials according to claim 3, characterized in that: The outer peripheral surface of the second segment (39) is provided with a second radial surface (36) and a second axial positioning surface (37) in sequence; One end face of the heat dissipation copper ring (4) is provided with a copper ring radial surface I (41) that contacts and cooperates with the second radial surface (36), and the inner circumferential surface of the heat dissipation copper ring (4) is provided with a copper ring axial positioning surface I (45) that contacts and cooperates with the second axial positioning surface (37).

5. A special hot nozzle structure for single-valve materials prone to burns according to claim 4, characterized in that: The outer circumferential surface of the heat dissipation copper ring (4) is provided with a copper ring radial surface II (42), a copper ring axial positioning surface II (43), and a copper ring radial surface III (44) on the other end face of the heat dissipation copper ring (4). The radial surface II (42), axial positioning surface II (43), and radial surface III (44) of the copper ring are in contact with the mold plate surface.

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