An air forming hood

Abstract

This utility model relates to the field of air forming cover technology and discloses an air forming cover, including a forming cover body. The forming cover body has a first end face and a second end face that are parallel to each other at its upper and lower ends. The first end face has a first air distribution ring and a second air distribution ring. Through the layered design of the first and second air distribution rings and the outer and inner air forming channels, air can enter the corresponding channels independently. The outer air forming channel outputs columnar airflow parallel to the axis, and the inner air forming channel outputs single-leaf hyperboloid airflow at an angle. Based on the different action forms of the layered airflow, the spray shape can be adjusted from a solid circle by adjusting the pressure of the two layers of airflow. The spray diameter can be flexibly adjusted with the airflow rate to adapt to the size and shape requirements of different coated workpieces. The connection design between the first and second air channels and the corresponding forming channels ensures that the forming air can be conducted without obstruction after entering from the manifold, reducing airflow loss.

Description

Technical Field

[0001] This utility model relates to the field of air-forming hood technology, and in particular to an air-forming hood. Background Technology

[0002] Electrostatic rotary cup spray guns are fundamental products for modernizing industrial spraying equipment. Electrostatic coating based on rotary cups boasts extremely high transfer efficiency and is widely used across various coating industries, especially in automotive body surface coating, where rotary cup systems are now prevalent. In coating production lines, the electrostatic rotary cup spray gun is the core equipment for surface treatment. It works by grounding the workpiece as the anode and connecting the electrostatic rotary cup to a negative high voltage as the cathode. Driven by a motor, the cup head of the electrostatic rotary cup rotates at high speed. After the paint is delivered to the electrostatic rotary cup, the high-speed rotation of the cup head atomizes the paint under centrifugal force. Typically, there is a ring of forming air holes or slits at the rear of the cup head, arranged coaxially with the cup head. The forming air ejected from the holes or slits forms a forward-facing air wall along the outer edge of the cup head. The atomized paint is compressed into a circular shape by the forming air and blown towards the workpiece by the forming airflow.

[0003] As rotary cups become increasingly widely used, different industries are placing increasingly higher demands on them. For example, in automotive painting, a larger spray pattern is often required when painting the hood or doors to ensure a uniform paint film. Conversely, a smaller spray pattern is needed when painting smaller areas like A-pillars and B-pillars to reduce overspray, resulting in a more uniform film thickness and conserving paint. The wheel industry, on the other hand, requires a smaller spray pattern and greater paint mist penetration. Traditional rotary cups offer two forming schemes: one uses a single forming hole or seam, resulting in a very limited spray pattern adjustment range, which is insufficient to meet the demands of increasingly sophisticated manufacturing; the other features an air source distribution structure with a single air inlet ring and two air outlet rings, allowing for adaptation to different industries by modifying the air source distribution structure, the angle and size of the air outlets.

[0004] Current rotary cup atomization systems use a ring of forming holes or slits coaxial with the cup head to adjust the shape of the paint mist. This ring of forming holes or slits can only fine-tune the final spray pattern by adjusting the pressure of the forming air. However, the final shape of the paint mist is affected by various parameters such as the type of paint, the cup head diameter, the cup head rotation speed, and the paint flow rate. Fluid dynamics shows that using a ring of forming holes or slits, with these parameters fixed, offers only a very small pressure adjustment range. This is because if the pressure increases, the formed shape becomes smaller, and the paint particle velocity also increases with the forming pressure. This leads to increased rebound of the paint mist upon reaching the workpiece, and a decrease in electrostatic capture ability, thus reducing coating efficiency. We know that paint generally consists of several components such as resin, solvent, pigment, and additives. Due to the significant differences in density among these components, their atomization capabilities differ during rotary cup atomization. Heavier components experience greater centrifugal force than lighter components, and lighter particles are more easily captured and shaped by the forming air. Therefore, the final paint mist shape formed by the rotary cup often consists of heavier paint particles on the outer ring and lighter paint particles on the inner ring. Reducing the forming air volume will make it difficult for paint mist to form, or will result in severe stratification of heavy and light particles in the formed paint mist, and will also cause reverse vortices to appear at the upper edge of the cup head. These reverse vortices exacerbate contamination of the vortex cup, not only wasting paint but also requiring timely cleaning for it to function properly.

[0005] Another option is to set an air source split structure on the forming hood. While this can increase the applicability of the rotary cup, there are too many types of forming hoods, the testing of air outlet angles and sizes is too extensive, and it is difficult to change the spray pattern size within the same spraying program. Utility Model Content

[0006] The purpose of this utility model is to solve the problems existing in the prior art by proposing an air-forming hood.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: An air-forming hood includes a forming hood body, wherein the upper and lower ends of the forming hood body are respectively provided with a first end face and a second end face that are parallel to each other. The first end face is provided with a first air distribution ring and a second air distribution ring. The first air distribution ring is provided with a plurality of first air channels, and the second air distribution ring is provided with a plurality of second air channels. The second end face is provided with an outer air forming channel and an inner air forming channel. The outer air forming channel is connected to the first air channel, and the inner air forming channel is connected to the second air channel. The outer air forming channel is parallel to the axis of the forming cover body, and the inner air forming channel is inclined to the second end face.

[0008] Preferably, the number of the first air channel and the second air channel is between 30 and 40, and the diameter of the first air channel and the second air channel is between 1 and 2.2 mm. The number of the outer air forming channel and the inner air forming channel corresponds to the number of the first air channel and the second air channel.

[0009] Preferably, the diameters of both the outer and inner air forming channels are between 0.5 and 1 mm.

[0010] Preferably, the airflow ejected from the outer air-forming channel is columnar, used to provide axial pressure to reduce the directional vortex formed at the lower part of the swivel cup head, and the airflow ejected from the inner air-forming channel is single-blade hyperboloid, used to provide radial tension to reduce the vortex at the upper part of the swivel cup head.

[0011] Preferably, an annular air channel is provided on one side of the first end face, and a motor shaft is provided on one side of the annular air channel for the passage of auxiliary airflow delivered by the motor shaft.

[0012] Preferably, the first air channel is collinear with the axis of the outer air forming channel, and the second air channel is collinear with the axis of the inner air forming channel.

[0013] Preferably, an internal conical cavity is provided on one side of the second end face, and a rotating cup head is provided in the internal conical cavity. The rotating cup head fits into the internal conical cavity of the molding cover body to form an annular air channel. The motor shaft and the annular air channel of the molding cover body form an auxiliary airflow channel, and the auxiliary airflow channel is connected to the annular air channel.

[0014] Preferably, a plurality of screw mounting holes are provided on one side of the first end face for mounting the rotary cup air manifold.

[0015] Compared with the prior art, the beneficial effects of this utility model are: This invention, through the layered design of the first and second air distribution rings and the outer and inner air forming channels, allows air to independently enter the first and second air distribution rings and then enter the corresponding channels. The outer air forming channel outputs a columnar airflow parallel to the axis, while the inner air forming channel outputs a single-blade hyperboloid airflow at an angle. Based on the different action modes of the layered airflow, in actual spraying, the spray pattern can be switched from a solid circle to a hollow circle by adjusting the pressure of the two layers of airflow. Moreover, the spray pattern diameter can be flexibly adjusted according to the airflow rate, which can adapt to the size and shape requirements of different workpieces to be coated. The interconnected design of the first and second air channels and the corresponding forming channels ensures that the forming air can be conducted without obstruction after entering from the manifold, reducing airflow loss. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view of an air-forming hood proposed in this utility model; Figure 2 This is a three-dimensional schematic diagram of an air-forming hood proposed in this utility model; Figure 3 This is a cross-sectional view of the air-forming cover, rotating cup head, and motor assembly shaft proposed in this utility model. Figure 4 This is a schematic diagram of the airflow direction.

[0017] In the figure: 1. Forming cover body; 2. First end face; 3. Second end face; 4. First air distribution ring; 5. Second air distribution ring; 6. Outer air forming channel; 7. Inner air forming channel; 8. Circumferential seam air channel; 9. Motor shaft; 10. Internal conical cavity; 11. Rotary cup head; 13. Auxiliary airflow channel; 14. Screw mounting hole; 15. First air channel; 16. Second air channel. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0019] Reference Figures 1-4 An air-forming hood includes a forming hood body 1, wherein the upper and lower ends of the forming hood body 1 are respectively provided with a first end face 2 and a second end face 3 that are parallel to each other. The first end face 2 is provided with a first air distribution ring 4 and a second air distribution ring 5. The first air distribution ring 4 is provided with a plurality of first air channels 15, and the second air distribution ring 5 is provided with a plurality of second air channels 16. The second end face 3 is provided with an outer air forming channel 6 and an inner air forming channel 7. The outer air forming channel 6 is connected to the first air channel 15, and the inner air forming channel 7 is connected to the second air channel 16. The outer air forming channel 6 is parallel to the axis of the forming cover body 1, and the inner air forming channel 7 is inclined to the second end face 3.

[0020] When in use, this device utilizes the layered design of the first and second air distribution rings 5 ​​and the outer and inner air forming channels 7 to allow air to independently enter the first and second air distribution rings 5 ​​and then enter the corresponding channels. The outer air forming channel 6 outputs columnar airflow parallel to the axis, while the inner air forming channel 7 outputs single-blade hyperboloid airflow at an angle. Based on the different action forms of the layered airflow, in actual spraying, the spray pattern can be switched from a solid circle (e.g., inner ring flow rate 0L / min, outer ring 100L / min) to a hollow circle (e.g., inner ring 300L / min, outer ring 100L / min) by adjusting the pressure of the two layers of airflow. Moreover, the spray pattern diameter can be flexibly adjusted according to the airflow rate, which can adapt to the size and shape requirements of different coated workpieces. The connection design between the first and second air channels 16 and the corresponding forming channels ensures that the forming air can be conducted without obstruction after entering from the manifold, reducing airflow loss. This application utilizes the interaction of two layers of forming airflow to fix the forming diameter within a certain distance range. With other parameters remaining unchanged, different paint particle velocities and different spray patterns can be obtained by adjusting the forming air pressure. This allows the rotary cup to have good adaptability to various paints and various workpieces, while improving coating efficiency, coating quality, and reducing paint waste.

[0021] In the example of this application, the number of the first air channel 15 and the second air channel 16 is between 30 and 40, and the diameter of the first air channel 15 and the second air channel 16 is between 1 and 2.2 mm. The number of the outer air forming channel 6 and the inner air forming channel 7 corresponds to the number of the first air channel 15 and the second air channel 16.

[0022] As a preferred example of this practical application, the design of 30-40 air channels, combined with a diameter of 1-2.2mm, ensures that the airflow is evenly distributed on the distribution ring. Each channel outputs consistent airflow and pressure, ensuring that the paint evenly covers the target paper regardless of whether the spray pattern is solid or hollow. This prevents localized accumulation or gaps, effectively avoiding coating defects caused by uneven airflow, improving spray pattern consistency and paint distribution uniformity, and adapting to multi-parameter coating requirements. The 1-2.2mm channel diameter ensures sufficient airflow intensity (e.g., a flow rate of 100L / min on the outer ring is sufficient to form...) The system provides a stable columnar airflow and allows ample space for airflow adjustment (stable output from 0L / min to 400L / min). The correspondence between the number of forming channels and air channels ensures that the adjustment of airflow in each layer can be precisely applied to the corresponding forming area. For example, when adjusting the airflow in the inner ring, only the inner ring spray size is changed (e.g., the inner ring increases from 100L / min to 400L / min, and the hollow inner ring increases from 7.5cm to 12.5cm). The outer ring spray shape remains unaffected, ensuring the accuracy and reliability of spray shape adjustment and avoiding adjustment failures caused by channel misalignment.

[0023] In the example of this application, the diameters of both the outer air forming channel 6 and the inner air forming channel 7 are between 0.5 and 1 mm.

[0024] As a preferred example of this utility model, the 0.5-1mm forming channel diameter makes the airflow more focused when it is ejected, and the airflow energy is concentrated on a specific area of ​​the target paper. Whether it is a solid circle or a hollow circle spray, the boundary is clearly distinguishable (e.g., when the inner circle is 300L / min and the outer circle is 100L / min, the boundary of the inner circle is 10.5cm and the outer circle is 25cm, which is clear), and there is no obvious diffusion or blurring phenomenon. It is especially suitable for scenarios with high requirements for coating boundary accuracy and improves the coating effect of details.

[0025] In the example of this application, the airflow ejected from the outer air-forming channel 6 is columnar and is used to provide axial pressure to reduce the directional vortex formed at the lower part of the swivel cup head 11. The airflow ejected from the inner air-forming channel 7 is hyperboloidal and is used to provide radial tension to reduce the vortex at the upper part of the swivel cup head 11.

[0026] As a preferred example of this utility model, the columnar outer airflow provides axial pressure, effectively reducing the vortex at the bottom of the cup head; the single-blade hyperboloid inner airflow provides radial tension, reducing the vortex at the top of the cup head. Under the dual action, the paint particles can move along a stable trajectory. In actual spraying, no matter how the spray pattern changes, there is no chaotic splashing of paint particles caused by vortices, ensuring the stability of the paint particle movement. By adjusting the pressure of the two airflow layers, different paint particle velocities can be obtained.

[0027] In the example of this application, an annular air channel 8 is provided on one side of the first end face 2, and a motor shaft 9 is provided on one side of the annular air channel 8 for the passage of auxiliary airflow delivered by the motor shaft 9.

[0028] As a preferred example of this utility model, the auxiliary airflow introduced by the annular air channel 8 in conjunction with the motor shaft 9 can blow free paint mist away from the forming hood and the rotary cup spray gun, preventing the mist from returning to contaminate the parts under the action of static electricity. In practical applications, this can reduce the number of times the forming hood needs cleaning and maintenance, thereby reducing maintenance costs; at the same time, it can avoid coating impurities (such as oil stains and paint residue) caused by component contamination, thus improving the product qualification rate.

[0029] In the example of this application, the first air channel 15 is collinear with the axis of the outer air forming channel 6, and the second air channel 16 is collinear with the axis of the inner air forming channel 7.

[0030] As a preferred example of this utility model, the coaxial design of the air channel and the forming channel allows the airflow to be ejected directly without turning, reducing energy loss and ensuring that airflow parameters (flow rate, pressure) can be accurately transmitted to the forming area. The coaxial design makes the airflow direction stable and less prone to turbulence or eddies.

[0031] In the example of this application, an internal conical cavity 10 is provided on one side of the second end face 3. The internal conical cavity 10 is provided with a rotating cup head 11. The rotating cup head 11 fits into the internal conical cavity 10 of the molding cover body 1 to form an annular air channel 8. The motor shaft 9 and the annular air channel 8 of the molding cover body 1 form an auxiliary airflow channel 13. The auxiliary airflow channel 13 is connected to the annular air channel 8.

[0032] As a preferred example of this utility model, the annular air channel 8 formed by the inner conical cavity 10 and the rotating cup head 11, combined with the auxiliary airflow channel 13 of the motor shaft 9, enables the auxiliary airflow to accurately cover the forming cover and the surrounding area of ​​the rotating cup, efficiently blowing away free mist; at the same time, the main airflow (outer and inner forming airflow) focuses on spraying and shaping. The synergistic effect of the two ensures the coating quality and solves the problem of component contamination, achieving the effect of protecting the components. The fitting design of the conical cavity and the cup head, and the cooperation between the motor shaft 9 and the annular channel, reduce the gap between components (no obvious airflow leakage) and reduce vibration and friction during operation.

[0033] In the example of this application, a plurality of screw mounting holes 14 are provided on one side of the first end face 2 for mounting the rotary cup air manifold.

[0034] As a preferred example of this utility model, the screw mounting holes 14 provide a clear fixing point for the connection of the rotary cup air manifold. The screw installation method is simple to operate and can quickly complete assembly and disassembly.

[0035] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An air forming hood, characterized by It includes a molded cover body (1), and the upper and lower ends of the molded cover body (1) are respectively provided with a first end face (2) and a second end face (3) that are parallel to each other. The first end face (2) is provided with a first air distribution ring (4) and a second air distribution ring (5). The first air distribution ring (4) is provided with a plurality of first air channels (15), and the second air distribution ring (5) is provided with a plurality of second air channels (16). The second end face (3) is provided with an outer air forming channel (6) and an inner air forming channel (7). The outer air forming channel (6) is connected to the first air channel (15), and the inner air forming channel (7) is connected to the second air channel (16). The outer air forming channel (6) is parallel to the axis of the forming cover body (1), and the inner air forming channel (7) is inclined to the second end face (3).

2. An air forming hood according to claim 1, characterized in that The number of the first air channel (15) and the second air channel (16) is between 30 and 40, and the diameter of the first air channel (15) and the second air channel (16) is between 1 and 2.2 mm. The number of the outer air forming channel (6) and the inner air forming channel (7) corresponds to the number of the first air channel (15) and the second air channel (16).

3. An air forming hood according to claim 1, wherein The diameters of the outer air forming channel (6) and the inner air forming channel (7) are both between 0.5 and 1 mm.

4. An air forming hood according to claim 2, wherein The airflow ejected from the outer air-forming channel (6) is columnar and is used to provide axial pressure to reduce the directional vortex formed at the bottom of the swivel cup head (11). The airflow ejected from the inner air-forming channel (7) is single-leaf hyperboloid and is used to provide radial tension to reduce the vortex at the top of the swivel cup head (11).

5. An air forming hood according to claim 1, wherein A ring-slit air channel (8) is provided on one side of the first end face (2), and a motor shaft (9) is provided on one side of the ring-slit air channel (8) for the passage of auxiliary airflow delivered by the motor shaft (9).

6. An air forming hood according to claim 1, wherein The first air channel (15) is collinear with the axis of the outer air forming channel (6), and the second air channel (16) is collinear with the axis of the inner air forming channel (7).

7. An air forming hood according to claim 5, wherein An internal conical cavity (10) is provided on one side of the second end face (3). The internal conical cavity (10) is provided with a rotating cup head (11). The rotating cup head (11) fits into the internal conical cavity (10) of the molding cover body (1) to form an annular air channel (8). The motor shaft (9) and the annular air channel (8) of the molding cover body (1) form an auxiliary airflow channel (13). The auxiliary airflow channel (13) is connected to the annular air channel (8).

8. An air forming hood according to claim 1, wherein A plurality of screw mounting holes (14) are provided on one side of the first end face (2) for mounting the rotary cup air manifold.

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