A flip-die hot nozzle structure suitable for products with high appearance requirements

Abstract

This utility model discloses a hot nozzle structure for inverted molds suitable for products with high appearance requirements. It includes a hot nozzle body, a nozzle head, a nozzle core, and a valve pin. A heating copper sleeve is fitted around the outside of the hot nozzle body. The upper and lower ends of the nozzle core extend beyond the nozzle head, and a first heat insulation cap is embedded in the lower end of the nozzle core. A sealing bushing is fitted around the outside of the heating copper sleeve, with its lower end extending to the lower end of the nozzle core and interfering with the outer side of the nozzle core. A water jacket is fitted around the outside of the sealing bushing, with a gap between the sealing bushing and the water jacket. A second heat insulation cap is fitted at the lower end of the sealing bushing, with its bottom lower than the bottom of the water jacket and abutting against the inner wall of the mold opening frame. The beneficial effects of this utility model are: it can prevent the water circulation within the water jacket from carrying away heat, causing heat loss and affecting the molding quality of the product, resulting in poor appearance; it can effectively seal the nozzle, ensuring the temperature of the hot nozzle body, nozzle head, and nozzle core, and guaranteeing the appearance quality of the product.

Description

Technical Field

[0001] This utility model relates to the field of hot runner technology, specifically a flip-chip hot nozzle structure suitable for products with high appearance requirements. Background Technology

[0002] As product appearance requirements become increasingly stringent, many products can no longer have glue injected on the outer surface and must instead have it injected on the reverse side. This results in the hot runner system and the mold's ejection system being in the same direction, causing the hot runner nozzle to have to pass through multiple mold plates, making the nozzle very long and resulting in significant expansion. Figure 1 and Figure 2 As shown, the ejector plate 700 needs to move up and down reciprocally. A large area between the hot runner seat plate 400 and the B seat plate 300 is unsupported. To prevent the mold plate from deforming, a support column 800 is placed between the hot runner seat plate 400 and the B seat plate 300, and the support column 800 usually has a margin of 0.1-0.2 mm. After the mold is closed, the mold plate will be subjected to strong pressure. After the mold is opened, the pressure is released. During this repeated stress process, the support column 800 will be compressed. In addition, the mold plate also has a certain amount of deformation. When the mold is opened and closed, the relative value of the mold thickness and the hot nozzle length changes. That is, when the mold is closed, the mold plate is compressed. At the same time, the heat insulation cap is compressed at the front end of the hot nozzle and completely locked against the mold opening frame 100. When the mold is opened, after the elasticity of the heat insulation cap fails, there will be a gap between the front end of the hot nozzle and the mold opening frame 100. Since the rubber compound is in a molten state throughout the process, it will seep into the curing position. Because the temperature of the mold core around the gate is low, the rubber compound within 100mm of the curing position will not flow and will not rush into the product, causing poor appearance. However, it will cause the nozzle core to come into contact with the water jacket. When the water jacket circulates, it will carry away the heat from the front end of the nozzle core, resulting in cold rubber at the front end of the hot nozzle.

[0003] Injection molding involves producing temperature-sensitive, highly transparent products. Because of their high transparency, even minor imperfections are easily visible. Furthermore, the temperature of the mold core around the gate cannot be too high, otherwise issues like pin sticking and gloss marks may occur. Therefore, it's crucial to ensure proper cooling water channels around the gate. Simultaneously, the internal temperature of the hot runner must be carefully controlled to prevent problems such as air bubbles, material runners, and waviness. Consequently, research and development on hot runner structures is ongoing. Utility Model Content

[0004] The purpose of this invention is to provide an inverted mold hot nozzle structure suitable for products with high appearance requirements, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a hot nozzle structure for an inverted mold suitable for products with high appearance requirements, which can cooperate with the mold opening frame on the mold core. The hot nozzle structure includes a hot nozzle body, a nozzle head disposed at the lower end of the hot nozzle body, a nozzle core disposed inside the nozzle head, and a valve needle disposed inside the hot nozzle body. A heating copper sleeve is provided on the outer side of the hot nozzle body. The upper and lower ends of the nozzle core extend out of the nozzle head, respectively. A first heat insulation cap is embedded at the lower end of the nozzle core. A sealing bushing is provided on the outer side of the heating copper sleeve. There is a gap between the sealing bushing and the heating copper sleeve. The lower end of the sealing bushing extends to the lower end of the nozzle core and is interference-fitted with the outer side of the nozzle core. A water jacket is provided on the outer side of the sealing bushing. There is a gap between the sealing bushing and the water jacket. A second heat insulation cap is provided on the lower end of the sealing bushing. The bottom of the second heat insulation cap is lower than the bottom of the water jacket. The bottom of the second heat insulation cap abuts against the inner wall of the mold opening frame.

[0006] Further optimization involves providing a second flange protruding outward along the circumference of the lower outer side of the nozzle core. This second flange is interference-fitted with the sealing bushing to achieve a sealing effect.

[0007] Further optimization involves providing a first flange protruding outward along its circumference on the lower outer side of the nozzle, and a third flange protruding inward that abuts against the first flange inside the sealing bushing, thereby sealing the gap between the nozzle and the sealing bushing.

[0008] Further optimization involves screwing the upper end of the outer wall of the nozzle to the lower end of the inner wall of the hot nozzle body, with the first flange located at the lower end of the threaded portion on the outer wall of the nozzle to ensure the connection between the nozzle and the hot nozzle body.

[0009] Further optimization involves providing an outwardly protruding boss at the upper end of the nozzle along its circumferential direction. The lower end face of the boss abuts against the upper end of the nozzle head, thereby supporting the nozzle head against the nozzle.

[0010] Further optimization involves providing a guide sleeve above the boss for guiding the valve needle. The upper end of the guide sleeve abuts against the inner wall of the hot nozzle body, and the guide sleeve is used to precisely guide the movement of the valve needle.

[0011] Further optimization involves providing a first sealing ring between the side wall of the water jacket and the mold opening frame, and a second sealing ring between the bottom of the water jacket and the mold opening frame. This prevents coolant leakage from affecting the temperature of the mold core at the gate position and thus impacting the stability of the nozzle core.

[0012] Further optimization involves an L-shaped cross-section for the second heat-insulating cap, which can wrap around the side of the sealing bushing and the ground. The sealing bushing engages with the second heat-insulating cap, enabling a quick connection between them.

[0013] Beneficial effects: The inverted mold hot nozzle structure of this utility model, which is suitable for products with high appearance requirements, can avoid direct contact between the hot nozzle body, nozzle head, nozzle core and heating copper sleeve and the water jacket by setting the sealing bushing. This prevents the water circulation in the water jacket from carrying away heat, causing heat loss and affecting the molding quality of the product, resulting in poor appearance.

[0014] The interference fit between the second flange at the lower end of the nozzle and the sealing bushing ensures that the nozzle and the sealing bushing remain in a fitted state during mold opening and closing, forming a first layer of sealing structure. The fit between the first flange on the nozzle and the third flange on the sealing bushing ensures the fit between the nozzle and the sealing bushing, forming a second layer of sealing structure. A second heat insulation cap is installed at the lower end of the sealing bushing, which abuts against the mold opening frame, forming a third layer of sealing structure. This three-layer sealing structure effectively prevents adhesive from entering the hot nozzle. The gap between the body, heating copper sleeve, nozzle, nozzle core, and sealing bushing is designed to prevent any impact on the hot nozzle structure of the inverted mold; it also prevents the adhesive from entering the gap between the water jacket and the sealing bushing. The circulating water in the water jacket can carry away the temperature of the nozzle core and the adhesive inside through the adhesive, preventing problems such as cold adhesive, air marks, material spots, and wavy patterns; the second heat insulation cap can avoid a series of problems caused by the failure of the first heat insulation cap. The adhesive will only seep into the curing area and will not flow, thus preventing it from splashing onto the product and causing appearance defects.

[0015] This inverted mold hot nozzle structure can effectively seal the adhesive and ensure the temperature of the hot nozzle body, nozzle head and nozzle core, thus guaranteeing the appearance quality of the product. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the installation structure of the hot nozzle on the mold as disclosed in the background art of this utility model.

[0017] Figure 2 for Figure 1 A magnified schematic diagram of a local structure with medium thermal resistance;

[0018] Figure 3 This is a schematic diagram of the inverted mold hot nozzle structure suitable for products with high appearance requirements, as disclosed in the embodiments of this utility model.

[0019] Figure 4 This is a partial structural diagram of the inverted mold hot nozzle structure disclosed in the embodiment of this utility model in the mold-closed state;

[0020] Figure 5 for Figure 4 Enlarged structural diagram at point A;

[0021] Figure 6 This is a partial structural diagram of the inverted mold hot nozzle structure disclosed in the embodiment of this utility model in the mold-open state.

[0022] Figure Labels

[0023] 1-Heating nozzle body, 2-Nozzle head, 21-First flange, 3-Nozzle core, 31-Second flange, 32-Boss, 4-Valve needle, 5-Heating copper sleeve, 6-Sealing bushing, 61-Third flange, 7-Water jacket, 8-First heat insulation cap, 9-Second heat insulation cap, 10-Guide sleeve, 11-First sealing ring, 12-Second sealing ring, 13-Positioning ring, 100-Mold opening frame, 200-Cure position. Detailed Implementation

[0024] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0025] like Figure 3-6 As shown, an inverted mold hot nozzle structure suitable for products with high appearance requirements can cooperate with the mold opening frame 100 on the mold core. This inverted mold hot nozzle structure includes a hot nozzle body 1, a nozzle head 2 disposed at the lower end of the hot nozzle body 1, a nozzle core 3 disposed inside the nozzle head 2, and a valve pin 4 disposed inside the hot nozzle body 1. A heating copper sleeve 5 is provided on the outer side of the hot nozzle body 1. The upper and lower ends of the nozzle core 3 extend out of the nozzle head 2, and a first heat insulation cap 8 is embedded at the lower end of the nozzle core 3. A sealing bushing 6 is fitted on the outer side of the heating copper sleeve 5. There is a gap between the sealing bushing 6 and the heating copper sleeve 5. The lower end of the sealing bushing 6 extends to the lower end of the nozzle core 3 and is interference-fitted with the outer side of the nozzle core 3. A water sleeve 7 is fitted on the outer side of the sealing bushing 6. There is a gap between the sealing bushing 6 and the water sleeve 7. A second heat insulation cap 9 is fitted on the lower end of the sealing bushing 6. The bottom of the second heat insulation cap 9 is lower than the bottom of the water sleeve 7. The bottom of the second heat insulation cap 9 abuts against the inner wall of the mold opening frame 100.

[0026] In this application, the inverted mold hot nozzle structure can cooperate with the mold opening frame 100 on the mold core to inject molten rubber into the cavity of the mold core. The inverted mold hot nozzle structure includes a hot nozzle body 1, a nozzle head 2, a nozzle core 3, a valve pin 4, and a heating copper sleeve 5. The hot nozzle body 1 is used to accurately and stably deliver the high-temperature molten rubber from the injection molding machine nozzle into the mold cavity, while maintaining the molten state and flow properties of the rubber during the delivery process. The nozzle head 2 is used for installing the nozzle core 3. The nozzle core 3 extends out of the hot nozzle body 1 at both the upper and lower ends, thus fixing the nozzle core 3 to the lower end of the hot nozzle body 1. The nozzle core 3 serves as the outlet end of the inverted mold hot nozzle structure, enabling the high-temperature molten rubber inside the hot nozzle body 1 to be injected into the mold cavity. The rubber is accurately injected into the set gate position through the nozzle core 3. The heating cylinder 5 is sleeved on the outside of the hot nozzle body 1, which can assist in heating the hot nozzle body 1, improve heat transfer efficiency, ensure the uniformity of the hot nozzle temperature, and ensure that the rubber inside the hot nozzle body 1 is always in a molten and flowing state.

[0027] In this application, the first heat insulation cap 8 is disposed at the lower end of the nozzle core 3, which has a heat insulation protection function. It is positioned between the hot nozzle body 1 and the mold core, reducing heat transfer to the mold core, preventing abnormal local temperature in the mold core from causing thermal deformation that affects product dimensional accuracy, preventing uneven temperature in other parts of the mold core from affecting molding quality, preventing heat loss from the nozzle core 3 to the mold core, and protecting surrounding mold components. Simultaneously, when the mold is closed, the first heat insulation cap 8 is compressed between the nozzle core 3 and the mold opening frame 100 on the mold core, preventing the high-temperature molten adhesive from flowing to the curing position 200 of the mold opening frame 100 and from seeping into the surrounding area. The sealing bushing 6 is sleeved on the outside of the heating copper sleeve 5, preventing the heating copper sleeve 5 and the hot nozzle body 1 from contacting the water jacket 7, thus preventing heat loss, and providing protection and guidance for the heating copper sleeve 5 and the hot nozzle body 1. Meanwhile, by extending the lower end of the sealing bushing 6 to the lower end of the nozzle core 3 and interfering with the outer side of the nozzle core 3, the overflow of the rubber material in the nozzle core 3 to the outer side of the heating copper sleeve 5 and the hot nozzle body 1 is prevented. This protects the hot nozzle structure profile of the inverted mold and reduces direct contact between the hot nozzle body 1, the heating copper sleeve 5 and the mold opening frame 100 of the mold core. The water jacket 7 has a circulating water channel, which has the effect of heat absorption and cooling. The water jacket 7 can prevent the heat on the hot nozzle structure of the inverted mold from dissipating to the mold core, thus playing a role in thermal isolation, which can lead to uneven heat distribution, mold core deformation, etc., thereby affecting the molding quality of the product. It can also play a cooling role, ensuring that the mold core temperature at the gate position is not too high, preventing problems such as sticking and bright marks, and preventing the rubber material from overheating at the gate, resulting in carbonization, black spots, flash, and stringing. The water jacket 7 is set on the outside of the sealing bushing 6, which can prevent the water jacket 7 from directly contacting the thermal resistance body 1 and the heating copper sleeve 5, so that the water channel in the water jacket 7 can circulate and carry away heat. The second heat insulation cap 9 is located at the lower end of the sealing bushing 6. The upper part of the second heat insulation cap 9 is tightly fitted to the sealing bushing 6, and the lower part is tightly fitted to the mold opening frame 100. This completely isolates the lower end of the nozzle core 3 from the water jacket 7, preventing heat from the sealing bushing 6 from being conducted to the mold core. It also prevents adhesive from seeping into the gap between the water jacket 7 and the sealing bushing 6 after the first heat insulation cap 8 fails. This prevents the water circulation within the water jacket 7 from carrying away heat from the nozzle core 3 and its interior through the seeping adhesive, thus preventing heat loss and temperature imbalance within the nozzle core 3, leading to a cold adhesive condition. If the first heat insulation cap 8 is compressed and loses its elasticity, the mold will open, and the adhesive will only seep into a small area at the front end of the nozzle core 3, i.e., within the curing position 200. Because the temperature of the mold core around the gate is relatively low, the adhesive within the curing position 200 will not flow and will not splash onto the product, causing appearance defects.

[0028] like Figure 5As shown, in one embodiment of this application, a second flange 31 protruding outwards is provided around the lower outer side of the nozzle core 3 along its circumference. The second flange 31 is interference-fitted with the sealing bushing 6. The provision of the second flange 31 ensures that the nozzle core 3 always maintains a mating state with the sealing bushing 6 during the mold opening and closing process, ensuring that the sealing bushing 6 forms a sealing state on the side of the nozzle core 3, and ensuring that the adhesive material does not enter the gap between the nozzle core 3 and the sealing bushing 6, thus forming a sealing structure.

[0029] Continue to refer to Figure 5 As shown, in another embodiment of this application, the lower outer side of the nozzle 2 is provided with a first flange 21 that protrudes outward along its circumference, and the interior of the sealing bushing 6 is provided with a third flange 61 that abuts against the first flange 21. Through the abutting cooperation of the first flange 21 and the third flange 61, the nozzle 2 is always in a cooperating state with the sealing bushing 6 during the mold opening and closing process, ensuring that the sealing bushing 6 forms a sealing state on the side of the nozzle 2, and ensuring that the adhesive does not enter the gap between the nozzle 2 and the sealing bushing 6, the gap between the heating copper sleeve 5 and the sealing bushing 6, and the gap between the hot nozzle body 1 and the sealing bushing 6, thus forming a second sealing structure.

[0030] Furthermore, the upper end of the outer wall of the nozzle 2 is screwed to the lower end of the inner wall of the hot nozzle body 1, and the first flange 21 is disposed at the lower end of the threaded portion on the outer wall of the nozzle 2. The screwing connection between the nozzle 2 and the hot nozzle body 1 enables a quick connection between them while ensuring a tight connection. Positioning the first flange 21 below the threaded portion on the outer wall of the nozzle 2 ensures that the nozzle 2 can be screwed to the hot nozzle body 1, and also ensures that the screwed first flange 21 can engage with the third flange 61 on the sealing bushing 6 to achieve a sealing effect.

[0031] like Figure 4 As shown, in another embodiment of this application, the upper end of the nozzle core 3 is provided with an outwardly protruding boss 32 along its circumferential direction, and the lower end face of the boss 32 abuts against the upper end of the nozzle 2.

[0032] In this embodiment, the nozzle core 3 is disposed inside the nozzle head 2 and the hot nozzle body 1. Since the upper and lower ends of the nozzle core 3 extend out of the upper and lower ends of the nozzle head 2 respectively, by providing a boss 32 at the upper end of the nozzle core 3, the nozzle core 3 can be supported and limited when the nozzle head 2 is fixed, so as to realize the installation and fixation of the nozzle core 3. The connection method is simple, the installation is easy, and it is easy to process.

[0033] Furthermore, a guide sleeve 10 for guiding the valve needle 4 is provided above the boss 32, and the upper end of the guide sleeve 10 abuts against the inner wall of the hot nozzle body 1. The guide sleeve 10 is used to precisely guide, position and support the movement of the valve needle 4, ensuring that the valve needle 4 can operate smoothly, accurately and reliably during the mold opening and closing process. The guide sleeve 10 is set above the boss 32. Through the support of the nozzle 2 on the boss 32, the boss 32 can support the guide sleeve 10, ultimately achieving the support and limitation of the nozzle 2 on the nozzle core 3 and the guide sleeve 10, ensuring the fixed and stable fixation of the nozzle core 3 and the guide sleeve 10.

[0034] like Figure 4-6 As shown, in another embodiment of this application, a first sealing ring 11 is provided between the side wall of the water jacket 7 and the mold opening frame 100, and a second sealing ring 12 is provided between the bottom of the water jacket 7 and the mold opening frame 100. In this embodiment, the first sealing ring 11 and the second sealing ring 12 are provided between the water jacket 7 and the mold opening frame 100 of the mold core to ensure the sealing between the water jacket 7 and the mold opening frame 100 of the mold core, and to prevent the risk of cooling water leakage.

[0035] like Figure 5 As shown, in another embodiment of this application, the second heat-insulating cap 9 has an L-shaped cross-section, which can wrap around the side and bottom of the sealing bushing 6. The sealing bushing 6 and the second heat-insulating cap 9 are engaged and connected, thus fixing the sealing bushing 6 and the second heat-insulating cap 9 together. In this embodiment, the second heat-insulating cap 9 has an L-shaped cross-section, which can wrap around the side and bottom of the sealing bushing 6, thereby ensuring that the sealing bushing 6 can fit with the corresponding position on the mold opening frame 100 to achieve a sealing effect and form a third layer of sealing structure. The second heat-insulating cap 9 is pressed into the sealing bushing 6 during the pressing process, thus engaging the two together. Specifically, the lower side of the sealing bushing 6 has a small protrusion, and the upper inner side of the second heat insulation cap 9 also has a small protrusion. When the sealing bushing 6 is pressed down, the protrusion at the lower end of the sealing bushing 6 is engaged with the protrusion on the inner side of the sealing bushing 6, and the two protrusions are engaged. The lower end of the sealing bushing 6 and the lower end of the inner wall of the second heat insulation cap 9 form a limit, thus fixing the second heat insulation cap 9 to the lower end of the fan bushing 6.

[0036] In this application, the upper end of the hot nozzle body 1 is provided with a positioning ring 13. The positioning ring 13 is used for the installation and positioning of the hot nozzle body 1 on the hot runner seat plate 400, and at the same time can prevent the hot nozzle body 1 from shifting or shaking in the mold.

[0037] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A hot nozzle structure for an inverted mold suitable for products with high appearance requirements, which can cooperate with a mold opening frame (100) on the mold core, the hot nozzle structure includes a hot nozzle body (1), a nozzle head (2) disposed at the lower end of the hot nozzle body (1), a nozzle core (3) disposed inside the nozzle head (2), and a valve pin (4) disposed inside the hot nozzle body (1), wherein a heating copper sleeve (5) is provided on the outer side of the hot nozzle body (1), characterized in that: The nozzle (3) extends from the nozzle head (2) at both the upper and lower ends. The lower end of the nozzle (3) is fitted with a first heat insulation cap (8). The outer side of the heating copper sleeve (5) is fitted with a sealing bushing (6). There is a gap between the sealing bushing (6) and the heating copper sleeve (5). The lower end of the sealing bushing (6) extends to the lower end of the nozzle (3) and is interference-fitted with the outer side of the nozzle (3). The outer side of the sealing bushing (6) is fitted with a water sleeve (7). There is a gap between the sealing bushing (6) and the water sleeve (7). The lower end of the sealing bushing (6) is fitted with a second heat insulation cap (9). The bottom of the second heat insulation cap (9) is lower than the bottom of the water sleeve (7). The bottom of the second heat insulation cap (9) abuts against the inner wall of the mold opening frame (100).

2. The inverted mold hot nozzle structure suitable for products with high appearance requirements according to claim 1, characterized in that: The lower outer side of the nozzle core (3) is provided with a second flange (31) protruding outward along its circumference, and the second flange (31) is interference-fitted with the sealing bushing (6).

3. The inverted mold hot nozzle structure suitable for products with high appearance requirements according to claim 1, characterized in that: The lower outer side of the nozzle (2) is provided with a first flange (21) that protrudes outward along its circumference, and the interior of the sealing bushing (6) is provided with a third flange (61) that protrudes inward and abuts against the first flange (21).

4. The inverted mold hot nozzle structure suitable for products with high appearance requirements according to claim 3, characterized in that: The upper end of the outer wall of the nozzle (2) is screwed to the lower end of the inner wall of the hot nozzle body (1), and the first flange (21) is disposed at the lower end of the threaded portion on the outer wall of the nozzle (2).

5. The inverted mold hot nozzle structure suitable for products with high appearance requirements according to claim 1, characterized in that: The upper end of the nozzle (3) is provided with an outward protrusion (32) along its circumferential direction, and the lower end face of the protrusion (32) abuts against the upper end of the nozzle (2).

6. The inverted mold hot nozzle structure suitable for products with high appearance requirements according to claim 5, characterized in that: The boss (32) is provided with a guide sleeve (10) for guiding the valve needle (4), and the upper end of the guide sleeve (10) abuts against the inner wall of the hot nozzle body (1).

7. The inverted mold hot nozzle structure suitable for products with high appearance requirements according to claim 1, characterized in that: A first sealing ring (11) is provided between the side wall of the water jacket (7) and the mold opening frame (100), and a second sealing ring (12) is provided between the bottom of the water jacket (7) and the mold opening frame (100).

8. The inverted mold hot nozzle structure suitable for products with high appearance requirements according to claim 1, characterized in that: The second heat insulation cap (9) has an L-shaped cross-section, which can wrap around the side of the sealing bushing (6) and the ground. The sealing bushing (6) is engaged with the second heat insulation cap (9).

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