Needle valve automatic glue overflowing system
By designing an overflow hole and an overflow channel on the needle valve sleeve, the problem of mold overflow was solved, enabling maintenance-free production, improving product quality, reducing costs, and extending the service life of the mold.
Patent Information
- Application Number
- CN202411123572.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-15
- Publication Date
- 2026-03-03
AI Technical Summary
In existing technologies, molds are prone to glue overflow during use, especially at the needle valve sleeve. This leads to frequent mold disassembly and cleaning, affecting production efficiency and product quality, and increasing maintenance costs.
An automatic overflow system for needle valves is designed. By opening an overflow hole and an overflow channel on the needle valve sleeve, and utilizing the fact that the diameter of the overflow hole is larger than the diameter of the needle valve sleeve, when the pressure of the molten material is too high, the molten material flows out through the overflow hole and overflow channel to be discharged, thus avoiding overflow from the distributor plate. The heating device maintains the fluidity of the material and prevents blockage.
It effectively avoids mold overflow problems, saves production time and maintenance costs, improves product quality, extends mold life, and reduces production costs.
Smart Images
Figure CN121589982A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of mold equipment technology, and in particular to an automatic needle valve overflow system. Background Technology
[0002] Manifold overflow is a common problem, primarily occurring in the hot runner systems of plastic injection molds. Overflow occurs when molten plastic accidentally spills out of the mold. Resolving overflow typically involves disassembling the mold to inspect and clean the manifold, ensuring it is properly sized to fit the hot runner nozzles and preventing gaps.
[0003] However, in actual use, regardless of the installation dimensions, some materials with good flowability or requiring high pressure, such as PP-PET-PE-PPSGF-PEEK-PA66GF, may experience glue overflow at the needle valve sleeve. This can cause the valve needle cylinder to fail to return to its original position, necessitating mold disassembly and glue removal after a period of use. Repeated mold disassembly slows down production. If the glue overflow is not addressed, the resulting product quality will be defective and unacceptable to customers, requiring repeated mold disassembly and maintenance, which takes time. Furthermore, repeated mold disassembly increases assembly errors, adding time costs to cleaning and maintenance. Additionally, some stubborn glue overflow can damage the mold itself, leading to mold failure and further increasing costs.
[0004] Commercially available solutions typically install alarm devices on the molds so that the equipment stops operating immediately when glue overflow occurs. While this prevents the overflow from spreading, it still requires disassembling and cleaning the mold, which is extremely inconvenient.
[0005] Therefore, improvements are needed. Summary of the Invention
[0006] The technical problem solved by the present invention is to address the deficiencies in the prior art by providing an automatic needle valve glue overflow system to solve the problems mentioned in the background art.
[0007] To solve the above technical problems, the present invention adopts the following technical solution: an automatic needle valve overflow system, comprising: a mold manifold, wherein the mold manifold has a hot runner for distributing molten material; the bottom of the mold manifold has a discharge hole for molten material to flow out, the discharge hole communicating with the hot runner; the top of the mold manifold has a main nozzle for molten material to enter; the mold manifold has one or more needle valve sleeves, at least a portion of the needle valve sleeve is placed inside the hot runner, and the needle valve sleeve has... The needle valve sleeve has a port communicating with the hot runner and the discharge port. It is used to cooperate with an external valve needle to open or close the flow of molten material through the discharge port. The needle valve sleeve has an overflow port at the location of the hot runner. The diameter of the overflow port is larger than the diameter of the needle valve sleeve. An overflow channel is provided inside the mold manifold and leads the flow to the outside. The overflow channel communicates with the overflow port. When the pressure of the molten material in the hot runner is high, the molten material in the hot runner is discharged through the overflow channel to release pressure.
[0008] Furthermore, the diameter of the overflow orifice is 1mm to 8mm larger than the diameter of the needle valve sleeve.
[0009] Furthermore, the distance between the lowest edge of the overflow orifice and the lowest edge of the needle valve sleeve is 5mm to 8mm.
[0010] Furthermore, the horizontal plane of the overflow channel is higher than the horizontal plane of the hot runner.
[0011] Furthermore, the overflow channels are formed by connecting them in series or in parallel.
[0012] Furthermore, it includes a heating device, which is disposed on the side of the mold manifold and connected to the overflow channel, and the heating device is used to heat the molten material in the overflow channel.
[0013] Furthermore, the needle valve sleeve is detachably connected to the mold flow divider plate, and the lower end face of the needle valve sleeve is in contact with the mold flow divider plate.
[0014] Furthermore, the mold manifold includes heating tubes laid on the upper and lower end faces of the mold manifold, the heating tubes being used to heat the molten material in the hot runner.
[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:
[0016] 1. By creating an overflow hole on the needle valve sleeve to match the overflow channel of the manifold, when the pressure of the molten material in the hot runner is high, the molten material can flow out from the overflow hole of the needle valve sleeve and be discharged outside the manifold through the overflow channel. This effectively avoids the problem of overflow from the manifold, and the valve needle can return to its position. During use, there is no need to disassemble and clean the mold, saving production time; no need to disassemble and maintain the mold, thus saving maintenance costs and achieving maintenance-free operation; the problem of overflow from the mold is solved, the product has no quality defects, and the product quality is improved; production costs are greatly reduced, and the service life of the mold is extended.
[0017] 2. Add a heating device to heat the molten material outside the manifold, so as to prevent the molten material discharged from the manifold from clogging and causing the manifold to overflow again. Attached Figure Description
[0018] Figure 1 This is a partial structural diagram of an automatic glue overflow system for mold applications.
[0019] Figure 2 This is a schematic diagram of the structure of the present invention.
[0020] Figure 3 This is a top view of the structure of the present invention.
[0021] Figure 4 yes Figure 3 A schematic diagram of the AA cross-section structure.
[0022] Figure 5 yes Figure 4 An enlarged structural diagram.
[0023] Figure 6 This is a side view structural diagram of the present invention.
[0024] Figure 7 yes Figure 6 A schematic diagram of the BB cross-section structure.
[0025] Figure 8 This is a front view structural diagram of the present invention.
[0026] Figure 9 yes Figure 8 A schematic diagram of the CC cross-section structure.
[0027] Figure 10 This is a schematic diagram of the overflow of adhesive from an existing needle valve sleeve.
[0028] Figure 11 This is a schematic diagram of a mold for applying the present invention.
[0029] Figure 12 This is an exploded view of a mold using an automatic glue overflow system.
[0030] Figure 13 This is a structural diagram of the needle valve cylinder, valve needle, needle valve sleeve, and hot nozzle.
[0031] Figure 14 This is a schematic diagram of an automatic glue overflow system.
[0032] Figure 15 yes Figure 14 A schematic diagram of the AA cross-section.
[0033] Figure 16 yes Figure 15 A magnified view of a portion of the image.
[0034] Reference numerals in the attached drawings: 1. Mold manifold; 2. Hot runner; 3. Discharge hole; 4. Main nozzle; 5. Needle valve sleeve; 6. Overflow hole; 7. Overflow channel; 8. Heating device; 9. Heating tube; 10. Needle valve cylinder; 11. Valve needle; 12. Hot nozzle; 13. Overflow position. Detailed Implementation
[0035] The present invention will now be described in further detail with reference to the accompanying drawings.
[0036] The embodiments described with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. In the description of this application, 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," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application 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, and therefore should not be construed as limiting this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "several" or "more than" means two or more, unless otherwise explicitly specified. In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. In this application, unless otherwise expressly specified and limited, "above" or "below" a second feature can include direct contact between the first and second features, or it can include contact between the first and second features through another feature between them. Moreover, "above," "over," and "on top" of a second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" of a second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0037] like Figure 1-9As shown, an automatic needle valve overflow system is provided, including: a mold manifold 1, the mold manifold 1 having a hot runner 2 for distributing molten material inside; a discharge hole 3 for molten material to flow out at the bottom of the mold manifold 1, the discharge hole 3 communicating with the hot runner 2; a main nozzle 4 for molten material to enter at the top of the mold manifold 1; and one or more needle valve sleeves 5 on the mold manifold 1, at least a portion of the needle valve sleeve 5 being placed inside the hot runner 2, the needle valve sleeve 5 having a connection with the hot runner 2, and the... The needle valve sleeve 5 is used to cooperate with an external valve needle to open or close the flow of molten material through the discharge hole 3. The needle valve sleeve 5 has an overflow hole 6 at the location of the hot runner 2. The diameter of the overflow hole 6 is larger than the diameter of the needle valve sleeve 5. An overflow channel 7 is provided inside the mold flow divider plate 1 and leads the flow to the outside. The overflow channel 7 communicates with the overflow hole 6. When the pressure of the molten material in the hot runner 2 is high, the molten material in the hot runner 2 is discharged and depressurized through the overflow channel 7.
[0038] An automatic overflow system with needle valves is provided, mainly for molds, such as injection molding equipment and blow molding equipment.
[0039] As described in the background section, the problem of overflow in molds mainly occurs at the manifold location. (Refer to...) Figure 10 The photos primarily depict pressure issues arising from the flow of various materials and the fluidity of the materials themselves. Specifically, excessive pressure or high fluidity of the molten material within the manifold causes it to overflow from the manifold. (Reference) Figure 16 As shown, overflow point 13 is mainly where molten material overflows. (Refer to...) Figure 14 and Figure 15 When molten material overflows from the valve needle sleeve 5, the needle valve cylinder 10 fails to return to its original position, resulting in product defects and the produced products failing to meet customer requirements.
[0040] To address this, an automatic overflow system for needle valves was proposed. This system automatically overflows adhesive when the pressure of the molten material in the hot runner 2 is too high, thus preventing adhesive overflow from the manifold.
[0041] In implementation, the hot runner 2 inside the manifold 1 is configured according to product requirements. The shape of the hot runner 2 is not limited and can be configured according to different products being produced. A valve needle 11 and a needle valve cylinder 10 are installed above the manifold 1, and a hot nozzle 12 is installed below the manifold 1. The valve needle 11 opens the hot nozzle 12 under the drive of the needle valve cylinder 10. During normal use, the main nozzle 4 on the manifold 1 allows molten material to enter, thus the molten material flows through the hot runner 2 and is diverted, connecting to the hot nozzle through the discharge hole 3 on the manifold 1 for product molding. When the pressure of the molten material in the hot runner 2 is high or the molten material has good fluidity, it is easy for the molten material to overflow from the needle valve sleeve 5. To address this, an overflow hole 6 is designed on the needle valve sleeve 5. The overflow hole 6 is horizontally positioned on the needle valve sleeve 5, and the diameter of the hole in the needle valve sleeve 5 is used to house the valve needle 11. In the design, to ensure the flow of molten material, the diameter of the overflow orifice 6 is designed to be larger than the diameter of the needle valve sleeve 5. With this structural design, if the pressure of the molten material in the flow divider plate 1 is too high or the flowability is good, the molten material in the hot runner 2 will flow towards the needle valve sleeve 5. Since the diameter of the overflow orifice 6 is designed to be larger than the diameter of the needle valve sleeve 5, the valve needle 11 cannot block and close the overflow orifice 6. As a result, the molten material flows out from the overflow orifice 6 to release pressure, so the molten material will not flow out from the top of the needle valve sleeve 5, causing the problem of glue overflow from the flow divider plate 1.
[0042] This technical solution utilizes an overflow hole 6 on the needle valve sleeve 5 to cooperate with the overflow channel 7 of the manifold 1. When the pressure of the molten material in the hot runner 2 is high, the molten material can flow out from the overflow hole 6 of the needle valve sleeve 5 and be discharged outside the manifold 1 through the overflow channel 7. This effectively avoids the overflow problem of the manifold 1. In use, there is no need to disassemble and clean the mold, saving production time; there is no need to disassemble and maintain the mold, thus saving maintenance costs and achieving maintenance-free operation; it solves the problem of overflow in the mold, ensuring no quality defects in the product and improving product quality; it greatly reduces production costs and extends the service life of the mold; and it effectively solves the overflow problem of materials with good fluidity, high temperature, or high injection pressure.
[0043] Preferably, the diameter of the overflow orifice is 1mm to 8mm larger than the diameter of the needle valve sleeve. This allows for timely pressure relief of the mold while meeting production requirements, preventing glue overflow.
[0044] Furthermore, the distance between the lowest edge of the overflow orifice and the lowest edge of the needle valve sleeve is 5mm to 8mm. This distance ensures timely pressure release when the molten material is under high pressure, preventing overflow from the needle valve. If the overflow orifice distance is set too large, timely pressure release may be impossible.
[0045] As a preferred technical solution, to facilitate the release of excessive pressure from the molten material, the horizontal plane of the overflow channel 7 is higher than that of the hot runner 2. Consequently, the molten material in the hot runner 2 is discharged outside the manifold through the overflow channel 7.
[0046] Specifically, the overflow channels 7 can be arranged in series or in parallel, and the choice can be made according to the specific implementation situation, without any limitation. For example, an overflow channel can be set independently for the position of each needle valve sleeve, or the overflow channels of multiple needle valve sleeves can be connected.
[0047] The present invention includes a heating device 8, which is disposed on the side of the mold flow divider plate 1 and connected to the overflow channel 7. The heating device 8 is used to heat the molten material in the overflow channel 7.
[0048] Because the molten material outside the manifold is prone to solidification and blockage without the heating device 8, making it impossible to discharge and relieve pressure, a heating device 8 is added to the outside of the manifold. The heating device 8 can be a heating tube using resistance wire heating or other methods to heat the molten material and maintain its fluidity.
[0049] Specifically, the needle valve sleeve 5 is detachably connected to the mold flow divider plate 1, and the lower end face of the needle valve sleeve 5 is in contact with the mold flow divider plate 1.
[0050] Specifically, the mold flow divider 1 includes heating pipes 9 laid on the upper and lower end surfaces of the mold flow divider 1, and the heating pipes 9 are used to heat the molten material in the hot runner 2.
[0051] The above does not limit the technical scope of the present invention in any way. Any modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the technical scope of the present invention.
Claims
1. A needle valve automatic glue overflow system, characterized in that, include: A mold manifold, wherein the mold manifold has a hot runner inside for diverting molten material; the bottom of the mold manifold has a discharge hole for molten material to flow out, the discharge hole being connected to the hot runner; the top of the mold manifold has a main nozzle for molten material to enter; the mold manifold has one or more needle valve sleeves, at least a portion of which is placed inside the hot runner, and each needle valve sleeve has a hole communicating with the hot runner and the discharge hole; the needle valve sleeve is used to cooperate with an external valve needle to open or close the flow of molten material through the discharge hole. The needle valve sleeve has an overflow hole at the hot runner position, and the diameter of the overflow hole is larger than the diameter of the needle valve sleeve. The mold manifold is provided with an overflow channel inside and the overflow is directed to the outside. The overflow channel is connected to the overflow hole. When the pressure of the molten material in the hot runner is high, the molten material in the hot runner is discharged through the overflow channel to release the pressure.
2. The needle valve automatic glue overflow system according to claim 1, characterized in that: The diameter of the overflow orifice is 1mm to 8mm larger than the diameter of the needle valve sleeve.
3. The needle valve automatic glue overflow system according to claim 1, characterized in that: The distance between the lowest edge of the overflow orifice and the lowest edge of the needle valve sleeve is 5mm to 8mm.
4. The needle valve automatic glue overflow system according to claim 1, characterized in that: The overflow channel is located at a higher level than the hot runner channel.
5. The needle valve automatic glue overflow system according to claim 1, characterized in that: The overflow channels are formed by connecting them in series or in parallel.
6. The needle valve automatic glue overflow system according to claim 1, characterized in that: It includes a heating device, which is located on the side of the mold flow divider and connected to the overflow channel. The heating device is used to heat the molten material in the overflow channel.
7. The needle valve automatic glue overflow system according to claim 1, characterized in that: The needle valve sleeve is detachably connected to the mold flow divider plate, and the lower end face of the needle valve sleeve is in contact with the mold flow divider plate.
8. The needle valve automatic glue overflow system according to claim 1, characterized in that: The mold manifold includes heating tubes laid on the upper and lower end faces of the mold manifold, and the heating tubes are used to heat the molten material in the hot runner.