A nozzle tip

Abstract

The utility model discloses a sprue bush, its cooling runner both ends are equipped with only one entrance and only one outlet respectively, therefore only through single entrance and single outlet realize real -time monitoring cooling fluid flow, still can realize more accurate control on the precision of cooling uniformity, and through cooling runner to the main stream passage cooling uniformity, and have better cooling efficiency to reduce the cooling time, and then shorten the overall forming cycle, improve the forming yield of optical element simultaneously, can also maintain the size of sprue bush fine small, guarantee its structural strength and processing feasibility simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, and in particular to a sprue sleeve, which can be applied to optical component molding molds. Background Technology

[0002] In the field of injection molding, due to the small size of the sprue bushing and the fact that the sprue bushing generally does not have a cooling channel for the main runner, the mold cooling time cannot be shortened, resulting in a longer overall molding cycle. In addition, the material temperature distribution in the main runner is also significantly different, which affects the molding yield.

[0003] In addition, when setting up cooling water channels on the sprue bushing to cool the main flow channel, the compatibility between the main flow channel and the cooling flow channel must be considered to ensure that the size of the sprue bushing is not too large, while also having sufficient structural strength and manufacturability.

[0004] Therefore, the problem that must be solved is how to achieve uniform temperature in both the long axis and transverse cross-section of the main runner while cooling it to improve molding yield, and how to maintain the fine and small size of the sprue bushing, structural strength and processing feasibility. Utility Model Content

[0005] To address the aforementioned problems, this invention provides a sprue sleeve that achieves uniform temperature through cooling the main runner, maintains the sprue sleeve's precise and small dimensions, and simultaneously ensures its structural strength and processing feasibility.

[0006] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0007] This utility model provides a sprue bushing, including a main channel extending along the long axis and a cooling channel surrounding the main channel. The cooling channel includes only one inlet for introducing a cooling fluid, only one outlet for discharging the cooling fluid, and a channel unit connecting the inlet and the outlet. The channel unit includes an inlet section that wraps around the main channel multiple times from the inlet for introducing the cooling fluid, a turning section for changing the flow direction of the cooling fluid, and an outlet section that wraps around the main channel multiple times for discharging the cooling fluid to the outlet, and satisfies 0.2≤DImin / BRmax≤9.0 and 1.0≤PII / BI≤18.0.

[0008] In one embodiment of this utility model, a material inlet is provided at one end of the main channel along the long axis direction.

[0009] In one embodiment of this utility model, the inlet, outlet and injection port are all located on the same side of the sprue sleeve.

[0010] In one embodiment of this utility model, the flow direction of the cooling fluid in the inlet section is opposite to the flow direction of the cooling fluid in the outlet section.

[0011] In one embodiment of this utility model, the aforementioned turning segment is a Y-shaped structure, and the acute angle formed by the two adjacent sides of the Y-shaped structure is 15 to 30 degrees.

[0012] In one embodiment of this utility model, the number of the aforementioned turning segments is two, and they are 180 degrees apart from each other.

[0013] In the above-mentioned gating sleeve, the embodiments may further selectively satisfy any of the following conditions:

[0014] 1.0 ≤ PIOmax / BO ≤ 13.0;

[0015] 0.1≤(DImin-BRmin) / BI≤8.0;

[0016] 0.1≤(DOmax-BRmax) / BI≤23.0;

[0017] 1.0 ≤ LR / (BI+PII) ≤ 16.0;

[0018] 2.0≤DOmax / BRmax≤24.0.

[0019] Wherein, BRmax is the maximum diameter of the main channel, BRmin is the minimum diameter of the main channel, BI is the maximum diameter of the inlet section, BO is the maximum diameter of the transverse cross section through which the cooling fluid can flow in the outlet section, DImin is the minimum distance of the inlet section around the main channel, DOmax is the maximum distance of the outlet section around the main channel, PII is the maximum spacing between two adjacent rings of the inlet section around the main channel in the long axis direction, PIOmax is the maximum spacing between two adjacent rings of the inlet and outlet sections around the main channel in the long axis direction, and LR is the maximum length of the main channel extending along the long axis direction from the injection port.

[0020] This invention ensures that the temperature of the plastic melt in the main channel is uniformly distributed in its long axis and transverse cross-section by having a cooling channel surrounding the main channel and wrapping around it multiple times from the inlet along the long axis of the main channel to the outlet. It can be used to install on injection molding molds for optical components.

[0021] The cooling channel of this invention has only one inlet and one outlet at each end. Therefore, the flow rate of the cooling fluid can be monitored through a single inlet and a single outlet. This makes it easier to grasp the real-time flow rate of the cooling fluid. For example, when the temperature of the main channel is too high, the flow rate of the cooling fluid can be increased. It can also achieve more accurate control in terms of cooling temperature uniformity.

[0022] The flow channel unit of this invention is formed by multiple turns around the inlet along the long axis of the main flow channel, and satisfies the following condition to achieve uniform temperature in both the long axis direction and the transverse cross-sectional direction.

[0023] When the condition (1) is met: 0.2≤DImin / BRmax≤9.0, the temperature distribution of the plastic melt in the transverse cross section of the main channel can be uniform. In addition, with the maximum diameter of the main channel and the minimum distance of the inlet section around the main channel set, the cooling efficiency can be guaranteed to shorten the cooling time. At the same time, the sprue sleeve of this utility model still has sufficient structural strength under the premise of its small size.

[0024] When the condition (2) is met: 1.0≤PII / BI≤18.0, by adjusting the ratio between the maximum distance between two adjacent rings of the inlet section around the main channel and parallel to the long axis and the maximum diameter of the transverse cross section through which the cooling fluid can flow in the inlet section to meet specific conditions, it is possible to ensure that the plastic melt in the main channel can dissipate heat stably along the plastic flow direction. In addition, in the long axis direction of the main channel, a better inlet section can be set according to the diameter of the inlet section and the distance between two adjacent rings to improve cooling efficiency and shorten cooling time. It is also possible to ensure that the temperature of the plastic melt in the long axis direction of the main channel is more uniform, thereby improving the molding yield.

[0025] Therefore, this utility model, by using a sprue sleeve with a cooling and temperature equalization function, can achieve better cooling efficiency, thereby reducing cooling time and shortening the overall molding cycle. At the same time, it can improve the molding yield of optical components, maintain the fine and small size of the sprue sleeve, and ensure its structural strength and processing feasibility. Attached Figure Description

[0026] Figure 1 The image shown is a top view of the sprue bushing in the embodiment;

[0027] Figure 2 As shown Figure 1 Sectional view of AA;

[0028] Figure 3 As shown Figure 1 Sectional view of BB;

[0029] Figure 4 The diagram shown is a schematic representation of the sprue bushing from another perspective in the embodiment.

[0030] Figure 5 The figure shown is a schematic diagram of the temperature distribution of a quarter circle in the transverse cross-section of the main channel in the embodiment.

[0031] Figure 6 The diagram shows the temperature distribution along the long axis of the main channel in the embodiment. Detailed Implementation

[0032] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. The components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0033] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0034] Reference Figures 1 to 6 This embodiment provides a sprue sleeve for mounting on an injection molding die for optical components.

[0035] like Figure 1 and Figure 2 As shown, the sprue bushing of this embodiment includes a main channel 1 extending along the long axis direction I and a cooling channel 2 surrounding the main channel 1. The upper end of the main channel 1 along its long axis direction I and away from the mold core of the injection molding mold is provided with a sprue port 11 for injecting liquid plastic melt. The lower end of the main channel 1 is used to connect to the branch channel of the injection molding mold.

[0036] The cooling channel 2 includes only one inlet 21 for introducing cooling fluid, only one outlet 22 for discharging cooling fluid, and a channel unit 23 connecting the inlet 21 and the outlet 22. At this time, the inlet 21, the outlet 22 and the injection port 11 are all located on the same side of the sprue sleeve, which is beneficial for designing the channel unit 23 and also keeps the size of the sprue sleeve within a small range.

[0037] More specifically, such as Figure 1 , Figure 3 and Figure 4 As shown, the flow channel unit 23 includes an inlet section 231 that wraps around the long axis I of the main flow channel 1 multiple times from the inlet 21 and is used to introduce cooling fluid, a turning section 232 that changes the flow direction of the cooling fluid, and an outlet section 233 that wraps around the long axis I of the main flow channel 1 multiple times and is used to discharge cooling fluid to the outlet 22.

[0038] The flow channel unit 23 in this embodiment meets the following requirements:

[0039] Condition (1): 0.2 ≤ DImin / BRmax ≤ 9.0, and

[0040] Conditional expression (2): 1.0≤PII / BI≤18.0.

[0041] Wherein, DImin is the minimum distance of the inlet section 231 around the main channel 1, BRmax is the maximum diameter of the main channel 1, PII is the maximum spacing between two adjacent rings of the inlet section 231 around the main channel 1 in the long axis direction I, and BI is the maximum diameter of the transverse cross section through which the cooling fluid can flow within the inlet section 231.

[0042] In conditional formula (1), the relationship between the cooling effect and the size and structural strength of the sprue bushing is adjusted by using the maximum diameter of the main runner 1 in conjunction with the introduction section 231. For example, the closer the introduction section 231 is to the main runner 1, the better the cooling effect. If the introduction section 231 and the main runner 1 are kept at an appropriate distance, it can be ensured that the sprue bushing still has sufficient structural strength under the premise of its small size, and will not affect the size of the mold components around the sprue bushing. Therefore, the size of the entire injection mold is also relatively small.

[0043] When the ratio of DImin / BRmax is too large, it indicates that the inlet section 231 is far from the main channel 1, and cannot effectively cool down, which also makes the overall size of the sprue bushing larger.

[0044] When the ratio of DImin / BRmax is small, it means that the inlet section 231 is closer to the main runner 1, which can cool the main runner 1 more easily. However, if the two are too close, the structural strength of the sprue bushing will be insufficient due to the small space between the runners. Therefore, the two need to be matched to design the best structure so as to achieve uniform cooling while maintaining the small size, structural strength and processing feasibility of the sprue bushing.

[0045] In condition (2), when the diameter of the inlet section 231 is large, the temperature of the main channel 1 drops faster; when the spacing of the inlet section 231 around the main channel 1 and in the direction parallel to the long axis I is short, more loops of the inlet section 231 can be used to improve the cooling efficiency.

[0046] When the PII / BI ratio is too large, it means that the distance between two adjacent loops is large, that is, the number of loops that the introduction segment 231 makes around the main channel 1 is small, so it cannot effectively cool the main channel 1.

[0047] When the PII / BI ratio is small, it indicates that the spacing between two adjacent rings is small, meaning that the introduction section 231 has a larger number of rings around the main channel 1, which can effectively reduce the temperature of the main channel 1. Furthermore, the diameter of the introduction section 231 must be matched to obtain an appropriate ratio, and by designing a better number of rings for the introduction section 231, the cooling effect can be improved, and uniform cooling can be achieved in the long axis direction I.

[0048] In summary, the cooling channel 2 of this invention has only one inlet 21 and only one outlet 22 at each end. Therefore, the real-time flow rate of the cooling fluid can be monitored through only a single inlet 21 and a single outlet 22. This makes it easier to grasp the real-time flow rate of the cooling fluid. For example, when the temperature in the main channel 1 is too high, the flow rate of the cooling fluid is increased. Therefore, more accurate control can be achieved in terms of cooling temperature uniformity.

[0049] The flow channel unit 23 of this utility model is formed by the inlet 21 around the long axis direction I of the main flow channel 1 in multiple turns, and satisfies the following conditions (1) and (2), so that temperature uniformity can be achieved in the long axis direction I and the transverse cross section direction.

[0050] When condition (1) is met, the temperature distribution of the plastic melt in the transverse cross section of the main channel 1 can be uniform. In addition, with the maximum diameter of the main channel 1 and the minimum distance of the inlet section 231 around the main channel 1, a better cooling efficiency can be guaranteed to shorten the cooling time. At the same time, the sprue sleeve of this utility model still has sufficient structural strength under the premise of its small size.

[0051] When condition (2) is met, by adjusting the ratio between the maximum spacing of two adjacent rings of the inlet section 231 around the main channel 1 and parallel to the long axis direction I and the maximum diameter of the transverse cross section through which the cooling fluid can flow in the inlet section 231, specific conditions can be met. This ensures that the plastic melt in the main channel 1 can dissipate heat stably along the plastic flow direction. Furthermore, a better inlet section 231 can be set according to the diameter of the inlet section 231 and the spacing of two adjacent rings in the long axis direction I of the main channel 1 to improve cooling efficiency and shorten cooling time. It can also ensure that the temperature of the plastic melt in the long axis direction I of the main channel 1 is more uniform, thereby improving the molding yield.

[0052] Therefore, this utility model, by using a sprue sleeve with a cooling and temperature equalization function, can achieve better cooling efficiency, thereby reducing cooling time and shortening the overall molding cycle. At the same time, it can improve the molding yield of optical components, maintain the fine and small size of the sprue sleeve, and ensure its structural strength and processing feasibility.

[0053] Of course, in other embodiments, the preferred ratio of DImin / BRmax can also be 1.0 to 5.0, and the preferred ratio of PII / BI can also be 2.0 to 4.0.

[0054] In another preferred embodiment, the flow channel unit 23 satisfies the condition (3): 1.0≤PIOmax / BO≤13.0, where BO is the maximum diameter of the transverse cross section through which the cooling fluid can flow in the outlet section 233, and PIOmax is the maximum distance between two adjacent rings of the inlet section 231 and the outlet section 233 around the main flow channel 1 in the long axis direction I.

[0055] By satisfying condition (3), it is beneficial to improve the cooling efficiency of the flow channel unit 23 in the long axis direction I of the main flow channel 1, while maintaining the structural strength and processing feasibility of the sprue bushing. Furthermore, by adjusting the matching between the diameter and spacing of the exit section 233, and by better setting the inlet section 231 and the exit section 233, the cooling uniformity efficiency can be improved. However, if the size of the sprue bushing is too small, the space between the flow channels will also become smaller, which will weaken the structural strength of the sprue bushing.

[0056] Of course, in other embodiments, the preferred ratio of PIOmax / BO can also be 1.0 to 3.0.

[0057] In another preferred embodiment, the flow channel unit 23 satisfies the condition (4): 0.1≤(DImin-BRmin) / BI≤8.0, where BRmin is the minimum diameter of the main flow channel 1. This is beneficial for the introduction section 231 to be set around the main flow channel 1 in a better way, so as to improve the cooling uniformity efficiency of the main flow channel 1 in the transverse cross-sectional direction, while maintaining the structural strength of the sprue sleeve and its processing feasibility.

[0058] Further preferably, the flow channel unit 23 satisfies the condition (5): 0.1≤(DOmax-BRmax) / BI≤23.0, where DOmax is the maximum distance of the lead-out section 233 around the main flow channel 1. This further facilitates the better placement of the lead-out section 233 around the main flow channel 1, so as to further improve the cooling uniformity efficiency of the main flow channel 1 in the transverse cross-sectional direction, while maintaining the structural strength of the sprue sleeve and its processing feasibility.

[0059] Further preferably, the flow channel unit 23 satisfies the condition (6): 1.0≤LR / (BI+PII)≤16.0, where LR is the maximum length of the main flow channel 1 extending along the long axis direction I from the injection port 11. This is beneficial to better set the inlet section 231 around the main flow channel 1, so as to further improve the cooling uniformity efficiency of the main flow channel 1 in the transverse cross section direction, while maintaining the structural strength of the sprue sleeve and its processing feasibility.

[0060] Of course, in other embodiments, the preferred ratio of (DImin-BRmin) / BI can also be 1.0 to 3.0, the preferred ratio of (DOmax-BRmax) / BI can also be 2.0 to 5.0, and the preferred ratio of LR / (BI+PII) can also be 1.0 to 3.0.

[0061] In another preferred embodiment, the flow channel unit 23 satisfies the condition (7): 2.0≤DOmax / BRmax≤24.0, where DOmax is the maximum distance of the lead-out section 233 around the main flow channel 1, which is beneficial to increase the cooling efficiency of the main flow channel 1 and can maintain a small gate sleeve size.

[0062] Of course, in other embodiments, the preferred ratio of DOmax / BRmax can also be 2.0 to 10.0.

[0063] In another preferred embodiment, the flow direction of the cooling fluid in the inlet section 231 is opposite to that in the outlet section 233. This is beneficial for designing the flow channel unit 23 and can also ensure that the main flow channel 1 is cooled uniformly in its transverse cross-sectional direction.

[0064] In another preferred embodiment, such as Figure 3 and Figure 4 As shown, the turning segment 232 is a Y-shaped structure. The acute angle formed by the two adjacent sides of the Y-shaped structure is 15 to 30 degrees. There are two turning segments 232, which are 180 degrees apart.

[0065] When two adjacent acute angles are large, the cooling fluid flows more easily. However, if the acute angle is too large, it will also restrict the space of the flow channel unit 23 provided in the long axis direction I. Therefore, the preferred acute angle is 15 to 30 degrees. This is beneficial for designing the flow channel unit 23, improving the cooling temperature uniformity, and maintaining the strength of the sprue bushing and the feasibility of processing.

[0066] In addition, the relevant parameters of the sprue bushing in this specific embodiment adopt the actual values ​​shown in Table 1. The molten plastic is injected into the main channel 1, and the temperature distribution in the area of ​​the main channel 1 within the sprue bushing is then measured. Figure 5 and Figure 6 As shown, where, Figure 5 The diagram shows the temperature distribution in the transverse cross-section of the main channel. Figure 6 The diagram shows the temperature distribution along the long axis of the main channel.

[0067] Table 1

[0068]

[0069]

[0070] like Figure 5 As shown, due to the frictional heat generated between the plastic melt and the inner wall of the main channel 1, the temperature at the edge corresponding to the inner wall of the main channel 1 is higher than the temperature at the center of the main channel 1, but the actual difference is less than 0.5 degrees. Therefore, the temperature of the plastic melt in the main channel 1 is still uniformly distributed in its transverse cross-section.

[0071] like Figure 6 As shown, the difference between the maximum and minimum temperatures of the plastic melt in the main channel 1 is within 1.5 degrees. Therefore, the temperature of the plastic melt in the main channel 1 is also uniformly distributed along the long axis direction I.

[0072] Of course, in other embodiments, DImin can also be selected in the range of 4.5 to 9.0 mm, and it is preferably 4.5 to 7.0 mm; BRmax can also be selected in the range of 1.8 to 10.0 mm, and it is preferably 1.8 to 6.0 mm; BI can also be selected in the range of 1.0 to 5.0 mm, and it is preferably 2.0 to 3.0 mm; PII can also be selected in the range of 4.0 to 18.0 mm, and it is preferably 7.0 to 9.0 mm; PIOmax can also be in the range of 3.0 to 13. The range is selected from 0 mm, and preferably from 4.0 to 5.0 mm; BO can also be selected from 1.0 to 5.0 mm, and preferably from 2.0 to 3.0 mm; BRmin can also be selected from 1.0 to 4.0 mm, and preferably from 1.0 to 2.5 mm; DOmax can also be selected from 10.0 to 24.0 mm, and preferably from 10.0 to 12.0 mm; LR can also be selected from 14.0 to 80.0 mm, and preferably from 14.0 to 16.0 mm.

[0073] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims, and all such changes shall be within the scope of protection of the present invention.

Claims

1. A nozzle tip characterized by: It includes a main channel extending along a long axis and a cooling channel surrounding the main channel. The cooling channel includes only one inlet for introducing a cooling fluid, only one outlet for discharging the cooling fluid, and a channel unit connecting the inlet and the outlet; The flow channel unit includes an inlet section that wraps around the long axis of the main flow channel multiple times from the inlet and is used to introduce the cooling fluid, a turning section that changes the flow direction of the cooling fluid, and an outlet section that wraps around the long axis of the main flow channel multiple times and is used to export the cooling fluid to the outlet. And satisfy 0.2≤DImin / BRmax≤9.0 and 1.0≤PII / BI≤18.0, where DImin is the minimum distance of the inlet segment around the main channel, BRmax is the maximum diameter of the main channel, PII is the maximum spacing between two adjacent rings of the inlet segment around the main channel in the long axis direction, and BI is the maximum diameter of the inlet segment.

2. The gate bush of claim 1, wherein: Furthermore, it satisfies 1.0≤PIOmax / BO≤13.0, where BO is the maximum diameter of the transverse cross section through which the cooling fluid can flow within the outlet section, and PIOmax is the maximum distance between two adjacent rings of the inlet section and the outlet section around the main channel in the long axis direction.

3. The gate bush of claim 1, wherein: Furthermore, it satisfies 0.1≤(DImin-BRmin) / BI≤ 8.0, where BRmin is the minimum diameter of the main channel.

4. The gate bush of claim 1, wherein: Furthermore, it satisfies 0.1≤(DOmax-BRmax) / BI≤23.0, where DOmax is the maximum distance of the lead-out segment around the main channel.

5. The gate bush of claim 1, wherein: The main runner is provided with a sprue at one end along the long axis; the sprue sleeve further satisfies 1.0≤LR / (BI+PII)≤16.0, where LR is the maximum length of the main runner starting from the sprue and along the long axis.

6. The gate bush of claim 1, wherein: Furthermore, it satisfies 2.0≤DOmax / BRmax≤24.0, where DOmax is the maximum distance of the lead-out segment around the main channel.

7. The gate sleeve according to claim 1, characterized in that: The main channel is provided with a sprue at one end along the long axis, and the inlet, outlet and sprue are all located on the same side of the sprue sleeve.

8. The gate bush of claim 1, wherein: The flow direction of the fluid in the inlet section is opposite to that in the outlet section.

9. The gate bush of claim 1, wherein: The transition segment is a Y-shaped structure, and the acute angle formed by the two adjacent sides of the Y-shaped structure is 15 to 30 degrees.

10. The gate bush of claim 1, wherein: The number of these transition segments is two, and they are 180 degrees apart.

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