An assembly structure of a coating mixing head and a mold

Abstract

The application relates to an assembly structure of a paint mixing head and a mold, and aims to solve the problems of excessively low temperature of a mixing head mounting fixed plate, frictional insertion and burning of a mixing head nozzle and a mold core steel material in the prior art. The assembly structure comprises a paint mixing head nozzle and a feeding flow channel, an inner wall of the paint mixing head nozzle is embedded with a zirconia ceramic ring; the feeding flow channel is arranged in the mold and is communicated with the paint mixing head nozzle and a mold cavity in the mold at two ends, and a thermal expansion coefficient of a material of the feeding flow channel is smaller than a thermal expansion coefficient of the paint mixing head nozzle. In addition, a paint mixing head fixed plate is further included, a temperature control loop is arranged in the paint mixing head fixed plate, and the temperature of the fixed plate is controlled through fluid medium circulation. Through the above design, paint residues in the nozzle are effectively reduced, mechanical stress and equipment wear caused by thermal expansion mismatch are avoided, the coating quality and the operation stability of the equipment are improved, the service life of the equipment is prolonged, and the production cost is reduced.

Description

Technical Field

[0001] This application relates to the field of injection molding coating equipment technology, and in particular to an assembly structure of a coating mixing head and a mold. Background Technology

[0002] In-mold coating technology is widely used for surface decoration of plastic products. By coating simultaneously with injection molding, it not only improves production efficiency but also ensures product quality and consistent appearance. However, several challenges in existing technologies affect the stability and effectiveness of this process. First, the temperature of the mixing head mounting plate is too low (measured temperature range: 26℃ to 35℃), causing some heat to be carried away from the mixing head, affecting mixing quality and production process stability. Second, in traditional designs, the mixing head nozzle end face directly contacts the mold core steel for sealing, which easily causes friction and burning between the mixing head nozzle and the mold core steel, leading to deformation and cracking of the mixing head nozzle's steel ring. Furthermore, residual coating on the inner wall of the mixing head nozzle is common, easily affecting the surface quality of the next molded product. Finally, for molds with complex structures and varied shapes, there is a lack of effective installation methods for in-mold coating mixing heads, making it difficult to meet diverse production needs. These problems limit the application and development of in-mold coating technology, necessitating an innovative solution to overcome these shortcomings. Utility Model Content

[0003] To address one or more of the problems existing in the prior art, the first aspect of this application provides an assembly structure for a paint mixing head and a mold, comprising:

[0004] A paint mixing head nozzle, wherein a ceramic ring is embedded in the inner wall of the paint mixing head nozzle;

[0005] The feed channel connects the paint mixing head nozzle to the mold cavity within the mold; and

[0006] A paint mixing head fixing plate is sleeved on the end of the paint mixing head nozzle and fixedly connected to the mold.

[0007] Preferably, the coating mixing head fixing plate is provided with a temperature control circuit inside, and the temperature control circuit is connected to an external fluid medium delivery controller through a pipeline, so as to indirectly adjust the temperature of the fixing plate by controlling the temperature of the circulating fluid medium.

[0008] Preferably, the fluid medium is an oily medium or an aqueous medium, and the flow rate of the fluid medium is 1-2.5 kg / min.

[0009] Preferably, the fit accuracy between the ceramic ring and the inner wall of the paint mixing head nozzle is 0.005mm-0.1mm, and the ceramic ring is a zirconia ceramic ring.

[0010] Preferably, the material of the feed channel is a plastic substrate, which can be at least one of PC, PC+ABS, PA66, ABS, PP, carbon fiber, and glass fiber; the material of the paint mixing head nozzle is steel.

[0011] The coefficient of thermal expansion of the material used in the feed channel is less than that of the material used in the paint mixing head nozzle.

[0012] Preferably, the angle formed between the nozzle of the paint mixing head and the end face at the inlet of the feed channel ranges from 1° to 50°.

[0013] Preferably, the material of the paint mixing head nozzle is a steel ring material with a hardness of HRC65°-68°.

[0014] The above-described one or more technical solutions of this application have at least the following beneficial effects:

[0015] The assembly structure of the paint mixing head and mold in this application achieves stable connection and efficient coating between the paint mixing head and mold through reasonable design of the connection method between the paint mixing head nozzle and the mold, as well as the material selection of the feed channel. It avoids the material deformation and cracking at the mixing head nozzle due to thermal expansion of the mixing head nozzle material and the mold core material, and friction and burning between the mixing head nozzle end face and the mold core, thereby reducing the risk of fatigue cracks or damage to the equipment during long-term use.

[0016] The paint mixing head and mold assembly structure of this application effectively reduces paint residue in the nozzle by embedding a ceramic ring in the inner wall of the paint mixing head nozzle, thus avoiding clogging and poor coating problems caused by paint residue. The ceramic ring is made of zirconia ceramic, which has excellent wear resistance, non-stick properties and heat insulation properties, and can significantly improve the service life of the paint mixing head nozzle and the coating quality.

[0017] In the assembly structure of this application, the paint mixing head fixing plate is equipped with a temperature control circuit. The temperature of the fixing plate is precisely controlled through fluid medium circulation, ensuring it remains within the ideal operating range of 60°C to 130°C. This design solves the problem of heat loss from the paint mixing head nozzle due to excessively low paint mixing head fixing plate temperature, thereby improving mixing quality and production process stability. Furthermore, the paint mixing head nozzle is made of high-hardness steel (HRC65°-68°), which effectively resists abrasion from paint particles, extending the nozzle's service life.

[0018] The coating mixing head and mold assembly structure of this application have good adaptability and flexibility, and can meet the requirements of different mold structures and coating processes. By adjusting the angle formed by the nozzle end face and the feed channel end face of the coating mixing head, damage to the mixing head can be effectively avoided, while controlling the flow direction and speed of the coating between the nozzle and the feed channel, thereby improving the coating mixing efficiency and coating quality. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the present application and form part of the specification. They are used together with the embodiments of the present application to explain the application and do not constitute a limitation thereof. In the drawings:

[0020] Figure 1 This is a schematic diagram of the assembly structure of the paint mixing head and the mold provided in an exemplary embodiment of this application;

[0021] Figure 2 This is a cross-sectional view of the nozzle of the paint mixing head, which is part of an assembly structure of the paint mixing head and the mold provided in an exemplary embodiment of this application.

[0022] Figure 3 This is a schematic diagram of the assembly structure of the paint mixing head and the mold provided in an exemplary embodiment of this application in the assembled state;

[0023] Figure 4 This is a schematic diagram of the assembly structure of the paint mixing head and the mold provided in another exemplary embodiment of this application;

[0024] Figure 5 This is a side cross-sectional view of the assembly structure of the paint mixing head and the mold provided in another exemplary embodiment of this application;

[0025] Figure label:

[0026] 1. Paint mixing head nozzle; 11. Ceramic ring; 2. Feed channel; 3. Mold; 31. Mold core; 32. Mold cavity; 4. Paint mixing head fixing plate; 41. Fluid medium input end; 42. Fluid medium output end; 43. Fluid medium delivery controller. Detailed Implementation

[0027] Embodiments of this application will now be described in detail, examples of which are illustrated in the accompanying drawings. The components of the embodiments of this application described and shown in the drawings herein can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application.

[0028] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" 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 between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0031] The following will combine Figure 1 and Figure 5 The technical solutions of this application are clearly and completely described. Obviously, the described embodiments are only some embodiments of this application, not all embodiments.

[0032] See Figures 1 to 5 As shown, the present application provides an assembly structure of a paint mixing head and a mold, including: a paint mixing head nozzle 1 and a feed channel 2. The paint mixing head nozzle 1 is connected to the mold core 31 of the mold 3 through the feed channel 2, thereby enabling the paint to be conveyed into the mold cavity 32.

[0033] A ceramic ring 11 is embedded in the inner wall of the paint mixing head nozzle 1. The ceramic ring 11 is made of high-performance ceramic material and has excellent wear resistance, non-stick properties, and heat insulation properties. By embedding the ceramic ring 11, paint residue on the inner wall of the nozzle can be effectively reduced, avoiding clogging and poor coating caused by paint residue, thereby improving coating quality and equipment operating stability.

[0034] The feed channel 2 is a passage connecting the paint mixing head nozzle 1 and the mold core 31 of the mold 3. Its function is to guide the mixed paint from the nozzle into the mold cavity 32. In this application, the feed channel 2 is located in the mold 3, with its two ends connected to the paint mixing head nozzle 1 and the mold core 31 of the mold 3, respectively. To reduce fitting problems caused by thermal expansion, the coefficient of thermal expansion of the material of the feed channel 2 is less than that of the paint mixing head nozzle 1. This design can effectively avoid excessive compression or loosening between the paint mixing head nozzle 1 and the feed channel 2 due to temperature changes during production, thereby ensuring that the paint can flow into the mold cavity stably and evenly, improving coating quality and equipment operational reliability.

[0035] The mold 3 has a cavity 32 inside for coating the product. The assembly structure of this application achieves a stable connection between the paint mixing head and the mold and high-quality, efficient coating by rationally designing the connection method between the paint mixing head nozzle 1 and the mold 3, and by selecting the material of the feed channel 2.

[0036] In some embodiments, to achieve a high-precision fit between the paint mixing head nozzle 1 and the ceramic ring, a ceramic ring with a precision of 0.005 mm can be installed into the steel ring of the paint mixing head nozzle 1 using a 600°C hot-pressing expansion process. Specifically, the steel ring at the paint mixing head nozzle 1 is heated to 600°C to achieve thermal expansion, at which point the inner diameter of the steel ring will slightly increase due to thermal expansion. Subsequently, a pre-processed ceramic ring, with an outer diameter precision controlled between 0.005 mm and 0.1 mm, is installed into the steel ring. Since the coefficient of thermal expansion of the ceramic ring is much lower than that of the steel ring, the steel ring will gradually contract during the cooling process, thereby generating radial pressure on the ceramic ring, ensuring a tight fit between the ceramic ring and the steel ring. After assembly, once cooled to room temperature, an interference fit is formed between the ceramic ring and the steel ring, achieving a perfect bond. This high-precision fit not only improves the wear resistance and service life of the paint mixing head nozzle 1 but also effectively reduces paint residue in the nozzle, improving coating quality and equipment operational stability.

[0037] In some embodiments, the ceramic ring may be made of zirconia ceramic, which has extremely high hardness and wear resistance, significantly improving the service life of the paint mixing head nozzle 1. During paint mixing and spraying, the ceramic ring effectively resists the abrasion of particles in the paint, maintaining the nozzle's accuracy and performance.

[0038] In some embodiments, the steel ring of the coating mixing head nozzle 1 has a material hardness requirement of HRC 65°-68°. This hardness range gives the steel ring extremely high wear resistance, effectively resisting the abrasion caused by particles in the coating. During the coating process, if the coating contains solid particles or abrasives, these particles will cause wear on the inner wall of the nozzle when flowing at high speed. A high-hardness steel ring can significantly reduce this wear and extend the service life of the nozzle.

[0039] In some embodiments, the material of the feed channel 2 is a plastic substrate, which can be at least one of PC, PC+ABS, PA66, ABS, PP, carbon fiber, and glass fiber; the paint mixing head nozzle 1 can be made of steel; the coefficient of thermal expansion of the feed channel is less than that of the paint mixing head nozzle. In some specific examples, the coefficient of thermal expansion of the feed channel 2 is 5.5 × 10⁻⁶. -6 / ℃, significantly lower than the coefficient of thermal expansion of 1.2×10 of the paint mixing head nozzle 1. -5 / ℃. The low coefficient of thermal expansion of the plastic substrate means that the dimensions of the feed channel 2 change little with temperature variations, thus maintaining the fitting accuracy between it and the paint mixing head nozzle 1 and reducing gap changes caused by thermal expansion mismatch. This not only improves the stability and consistency of the coating process but also reduces mechanical stress caused by differences in thermal expansion, lowering the risk of fatigue cracks or damage to the equipment during long-term use.

[0040] In some embodiments, the assembly structure of the paint mixing head and the mold provided in this application further includes a paint mixing head fixing plate 4, which is sleeved on the end of the paint mixing head nozzle 1 and fixed relative to the paint mixing head nozzle 1. This design ensures the stability of the paint mixing head nozzle 1 during operation, reduces nozzle displacement caused by equipment vibration or external impact, thereby improving the accuracy and consistency of coating.

[0041] Furthermore, the paint mixing head fixing plate 4 is fixedly mounted on one side of the mold 3, allowing the paint mixing head nozzle 1 to accurately pass through the paint mixing head fixing plate 4 and connect with the feed channel 2, further optimizing the paint transmission path and ensuring the stability of paint transmission. The specific position of the paint mixing head fixing plate 4 can be adjusted according to actual production needs to adapt to the requirements of different mold structures and coating processes.

[0042] In some embodiments, the coating mixing head fixing plate 4 is provided with a temperature control circuit with an aperture of 10mm. This temperature control circuit precisely controls the temperature of the coating mixing head fixing plate 4 through fluid medium circulation, ensuring that it is maintained within the ideal operating range. This temperature can be adjusted according to the required temperature of the material inside the membrane.

[0043] The paint mixing head fixing plate 4 is equipped with a fluid medium input end 41 and a fluid medium output end 42. These two ports are connected to the fluid medium delivery controller 43 through pipelines, forming a closed-loop temperature control system. The fluid medium delivery controller 43 is responsible for delivering the heated fluid medium to the temperature control loop and recovering the cooled fluid medium, thereby achieving precise temperature control of the paint mixing head fixing plate 4. This solves the problem that if the temperature of the paint mixing head fixing plate 4 is too low, some of the heat from the paint mixing head nozzle 1 will be carried away by the fixing plate, affecting the mixing quality and causing instability in the production process.

[0044] In some embodiments, the fluid medium is an oily medium or an aqueous medium, and the flow rate of the fluid medium is 1-2.5 kg / min.

[0045] In some embodiments, reference Figure 5 The angle between the nozzle 1 of the paint mixing head and the end face at the inlet of the feed channel 2 ranges from 1° to 50°. By adjusting the angle, the flow direction and speed of the paint between the nozzle and the feed channel can be effectively controlled, reducing pressure loss caused by fluid resistance, thereby improving the mixing efficiency and coating quality of the paint. At the same time, the angle within this range can prevent damage to the nozzle 1 of the paint mixing head.

[0046] Furthermore, a suitable angle design helps reduce paint buildup and residue on the nozzle tip, lowering the risk of equipment failure due to paint curing or clogging. This optimized angle design not only improves equipment operational stability but also extends maintenance cycles and reduces production costs.

[0047] In-mold coating technology has many applications in reality, involving molds with complex structures and varied shapes. However, there is a lack of solutions that provide different installation methods and approaches for in-mold coating mixing heads. The coating mixing head and mold assembly structure provided in this application can adapt to a variety of application scenarios.

[0048] In some embodiments, see Figure 3 The coating mixing head and mold assembly structure provided in this application can be adapted to a sliding table mold in an in-film coating mechanism. In this embodiment, the right side consists of two coating half molds and a forming half mold that can move up and down, and the left side consists of a half mold that cooperates with it and moves left and right. The coating mixing head nozzle 1 is located at the bottom of the core of the coating half mold on the right side and injects coating coating from bottom to top.

[0049] It should be noted that the technical solutions in the various embodiments of this application can be combined with each other, but the basis for such combination is that they can be implemented by those skilled in the art. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist, that is, it is not within the protection scope of this application.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. An assembly structure for a paint mixing head and a mold, characterized in that, include: A paint mixing head nozzle, wherein a ceramic ring is embedded in the inner wall of the paint mixing head nozzle; A feed channel is used to connect the paint mixing head nozzle to the mold cavity inside the mold. and A paint mixing head fixing plate is sleeved on the end of the paint mixing head nozzle and fixedly connected to the mold.

2. The assembly structure of the paint mixing head and the mold according to claim 1, characterized in that, The coating mixing head fixing plate is equipped with a temperature control circuit inside. The temperature control circuit is connected to an external fluid medium delivery controller through a pipeline. The temperature of the fixing plate is indirectly adjusted by controlling the temperature of the circulating fluid medium.

3. The assembly structure of the paint mixing head and the mold according to claim 2, characterized in that, The fluid medium is an oily or water-based medium, and the flow rate of the fluid medium is from 1 kg / min to 2.5 kg / min.

4. The assembly structure of the paint mixing head and the mold according to claim 1, characterized in that, The fitting accuracy between the ceramic ring and the inner wall of the paint mixing head nozzle is 0.005 mm to 0.1 mm, and the ceramic ring is a zirconia ceramic ring.

5. The assembly structure of the paint mixing head and the mold according to claim 1, characterized in that, The material of the feed channel is a plastic substrate, which can be one of PC, PC+ABS, PA66, ABS, PP, carbon fiber, and glass fiber; the material of the paint mixing head nozzle is steel. The coefficient of thermal expansion of the material used in the feed channel is less than that of the material used in the paint mixing head nozzle.

6. The assembly structure of the paint mixing head and the mold according to claim 1, characterized in that, The angle between the nozzle of the paint mixing head and the end face at the inlet of the feed channel ranges from 1° to 50°.

7. The assembly structure of the paint mixing head and the mold according to claim 1, characterized in that, The coating mixing head nozzle is made of steel ring material with a hardness of HRC65° to 68°.

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