Fluorocarbon coating electrostatic spraying rotary cup atomizer structure

Abstract

This utility model discloses a rotary cup atomizer structure for electrostatic spraying of fluorocarbon coatings, relating to the field of electrostatic spraying rotary cup technology. It includes a housing and a rotary cup, with the rotary cup disposed within the inner cavity of the housing. A feed pipe is fixedly connected to the middle of the right side wall of the rotary cup, and mounting columns are fixedly connected to the upper and lower sides of the left end of the feed pipe. This rotary cup atomizer structure for electrostatic spraying of fluorocarbon coatings feeds material into the rotary cup through the feed pipe. During feeding, the coating is cut by a perforated plate, dividing large streams of coating into smaller liquid flows or droplets. The sprayed coating is reflected by an arc-shaped reflector plate in conjunction with the mounting columns, increasing the contact area between the coating and air and improving the atomization effect. Then, the coating passes through a guide channel in conjunction with a baffle plate, causing the coating to generate a more complex flow pattern during directional flow, increasing the mixing degree within the coating and between the coating and air, thereby improving the overall atomization effect.

Description

Technical Field

[0001] This utility model relates to the field of electrostatic spraying rotary cup technology, specifically the structure of a rotary cup atomizer for electrostatic spraying of fluorocarbon coatings. Background Technology

[0002] Coating is a traditional craft with a long history. With rising market demand and higher quality requirements, various new coating technologies and processes are constantly emerging, gradually becoming a modern and practical industrial technology. Whether from the perspective of improving product quality and production efficiency, or from the perspective of saving paint and reducing environmental pollution, high-speed rotary cup electrostatic spraying has become one of the main methods of modern automobile body coating. It uses grounded workpiece as the anode and electrostatic spray gun (rotary cup) connected to negative high voltage as the cathode. When the paint is sent to the high-speed rotating cup, the centrifugal force generated by the rotation of the cup causes the paint to spread into a thin film on the inner surface of the cup and gain a huge acceleration to move towards the edge of the cup. Under the dual action of centrifugal force and strong electric field, it breaks into extremely fine and charged droplets, which move towards the workpiece with opposite polarity and deposit on the surface of the workpiece to form a uniform, flat, smooth, and full coating film.

[0003] The existing publication number CN210496862U discloses an atomization structure for an electrostatic rotary cup, including a centrifugal atomization structure and a pneumatic atomization structure. The centrifugal atomization structure includes a rotary cup that rotates at high speed pneumatically and a distributor cap that covers the rotary cup to disperse paint, delivered by an oil injector rod mounted axially within the rotary cup, onto the inner wall of the rotary cup. The pneumatic atomization structure includes a rotary cup and a diverter atomizer that is rotatably mounted on the outer circumference of the rotary cup to form a high-speed airflow outlet. This invention can improve the atomization effect through the combined effect of pneumatic atomization and centrifugal atomization, while also having a good convergence effect on the atomized oil particle bundles, facilitating precise and uniform spraying.

[0004] The aforementioned device atomizes the coating by combining centrifugal atomization and pneumatic atomization. However, when spraying coatings with high viscosity and poor flowability, such as fluorocarbon coatings, the fluorocarbon coating transported from the injection rod to the distributor cap is difficult to be quickly and evenly thrown onto the inner wall of the rotary cup under centrifugal force. This results in the coating not being able to fully spread into a thin film, and the resulting droplets are large and uneven. Some fluorocarbon coating may accumulate locally on the distributor cap or the inner wall of the rotary cup, failing to effectively participate in the centrifugal atomization process, reducing the degree of atomization, and thus leading to poor atomization effect. Utility Model Content

[0005] The purpose of this invention is to provide a rotary cup atomizer structure for electrostatic spraying of fluorocarbon coatings, so as to solve the problem that the existing devices have poor atomization effect when spraying coatings with high viscosity and poor flowability.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a rotary cup atomizer structure for electrostatic spraying of fluorocarbon coatings, comprising a shell and a rotary cup, wherein the rotary cup is disposed in the inner cavity of the shell, a feed pipe is fixedly connected to the middle of the right side wall of the rotary cup, mounting columns are fixedly connected to the upper and lower sides of the left end of the feed pipe, an arc-shaped reflector plate is fixedly connected to the ends of the two mounting columns, and a perforated plate is fixedly connected to the left side of the inner cavity wall of the feed pipe;

[0007] The right end of the conveying pipe is rotatably connected to a stainless steel cylinder via a sealed bearing. The outer wall of the stainless steel cylinder is spirally wound with a self-regulating electric heating tape.

[0008] The perforations on the orifice plate allow for the cutting of the paint, breaking down the large stream of paint output from the feed pipe into smaller liquid streams or droplets. For high-viscosity paints, this cutting action effectively breaks down the strong adhesive bonds within the paint, allowing a smaller portion of the paint to enter the subsequent atomization process upon spraying. This reduces the resistance of viscosity to paint flow and dispersion, creating better conditions for the subsequent atomization process. Next, an arc-shaped reflector, in conjunction with the mounting column, reflects the paint stream sprayed from the orifice plate. The rotation of the arc-shaped reflector generates centrifugal force, which further disperses the paint, overcoming some of the paint's adhesive forces and allowing it to spread over a larger area, increasing the contact area between the paint and air and improving the atomization effect. Simultaneously, a stainless steel feed cylinder, combined with a self-regulating temperature-controlled electric heating tape, heats the paint, improving its fluidity and thus enhancing the subsequent atomization effect.

[0009] Preferably, the arc-shaped reflector is located inside the rotating cup, and the inner wall of the rotating cup has a guide groove. The guide groove is evenly distributed in a ring, and the multiple guide grooves are interconnected.

[0010] The guide channel directs the paint dispersed from the arc-shaped reflector in a specific direction, allowing the paint to spread evenly outward along the channel's trajectory. This helps control the paint's flow path, preventing random splashing or aggregation. The paint is subjected to shear and friction forces, which further segment and refine it, forming smaller droplets or filaments. This results in a uniform paint film, which is then atomized into uniform particle bundles, ensuring more even deposition of the paint on the workpiece surface during spraying.

[0011] Preferably, the inner wall of the guide channel is fixedly connected with a baffle plate, and the baffle plate is evenly distributed and the baffle plate is triangular in shape.

[0012] The turbulence-inducing plate allows the coating to generate a more complex flow pattern during the flow process, breaking the original relatively stable flow state and forming more small vortices and turbulence. This increases the degree of mixing inside the coating and between the coating and the air, which helps to further refine the coating particles and make the coating atomization effect better.

[0013] Preferably, the inner wall of the arc-shaped reflector is coated with polytetrafluoroethylene.

[0014] By applying a polytetrafluoroethylene (PTFE) coating to the curved reflector, the coating is less likely to adhere to the surface due to the extremely low surface energy of PTFE, thus reducing the adhesion and accumulation of the coating.

[0015] Preferably, the outer wall of the conveying pipe is provided with a heat insulation plate, the heat insulation plate is located between the rotary cup and the stainless steel barrel, the heat insulation plate is fixedly connected to the inner wall of the shell, and the heat insulation plate is movably connected to the conveying pipe.

[0016] Heat insulation panels are installed to prevent heat from affecting other components when the paint is heated.

[0017] Preferably, a small brushless DC motor is fixedly connected to the left side wall of the heat insulation plate, and a first traction gear is fixedly connected to the output shaft of the small brushless DC motor. A second traction gear is fixedly connected to the outer side wall of the material conveying pipe, and the second traction gear meshes with the first traction gear.

[0018] By setting up a small DC brushless motor in conjunction with the first and second traction gears, the rotation speed of the rotating cup can be precisely controlled when it is rotating to perform operations. This allows the rotating cup to maintain a stable rotation speed, so that the coating is evenly thrown out from the edge of the rotating cup under the action of centrifugal force. The resulting coating particle bundles are more uniform and delicate, which helps to improve the smoothness and uniformity of the subsequent coating.

[0019] Preferably, the outer side wall of the rotary cup is evenly provided with ball bearings, and the middle of the right side wall of the stainless steel cylinder is fixedly connected to a connecting pipe.

[0020] By incorporating ball bearings to assist the rotation of the rotary cup, the rotation becomes more stable, and the connecting pipe facilitates material feeding.

[0021] Compared with the prior art, the beneficial effects of this utility model are:

[0022] 1. This application uses a conveying pipe to feed the coating into a rotating cup. During the feeding process, the coating is cut by an orifice plate, dividing the large stream of coating into smaller liquid streams or droplets. The sprayed coating is reflected by an arc-shaped reflector plate and a mounting column, increasing the contact area between the coating and the air and improving the atomization effect of the coating. Then, the coating passes through a guide channel and a baffle plate, which makes the coating generate a more complex flow pattern during the directional flow process, increasing the degree of mixing inside the coating and between the coating and the air, thereby improving the overall atomization effect.

[0023] 2. This application uses a stainless steel barrel with a self-regulating electric heating tape to heat the coating, thereby improving the fluidity of the coating and thus enhancing the subsequent atomization effect. A small DC brushless motor, in conjunction with the first and second traction gears, can precisely control the rotation speed of the rotating cup, keeping the rotating cup at a stable rotation speed. This allows the coating to be evenly thrown out from the edge of the rotating cup under centrifugal force, thereby improving the smoothness and uniformity of the subsequent coating. Attached Figure Description

[0024] Figure 1 This is a three-dimensional schematic diagram of the present invention;

[0025] Figure 2 This is a schematic diagram of the main sectional view of the present invention;

[0026] Figure 3 This is a top sectional view of the shell structure of this utility model;

[0027] Figure 4 This is a schematic diagram of the rotating cup structure of this utility model;

[0028] Figure 5 This utility model Figure 2 Enlarged diagram of A in the middle

[0029] Figure 6 This utility model Figure 4 Enlarged diagram of B in the diagram.

[0030] Labels in the diagram: 100, shell; 110, stainless steel barrel; 111, self-regulating electric heating tape; 120, heat insulation plate; 130, small DC brushless motor; 131, first traction gear; 132, second traction gear; 200, rotary cup; 210, feed pipe; 211, mounting column; 212, arc-shaped reflector; 213, perforated plate; 220, guide channel; 230, baffle plate. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Example: Figures 1-6 As shown, this utility model provides a technical solution for a rotary cup atomizer structure for electrostatic spraying of fluorocarbon coatings, including a housing 100 and a rotary cup 200;

[0033] Please refer to this carefully. Figures 1-6 A rotating cup 200 is disposed within the inner cavity of the housing 100. A feed pipe 210 is fixedly connected to the middle of the right side wall of the rotating cup 200. Mounting posts 211 are fixedly connected to the upper and lower sides of the left end of the feed pipe 210. An arc-shaped reflector plate 212 is fixedly connected to the ends of the two mounting posts 211. A perforated plate 213 is fixedly connected to the left side of the inner cavity wall of the feed pipe 210. The arc-shaped reflector plate 212 is located inside the rotating cup 200. A guide groove 220 is opened on the inner side wall of the rotating cup 200. The guide grooves 220 are evenly distributed in a ring shape, and multiple guide grooves 220 are interconnected. A baffle plate 230 is fixedly connected to the inner cavity wall of the guide groove 220. The baffle plates 230 are evenly distributed and are triangular in shape. A tetrahedron is provided on the inner side wall of the arc-shaped reflector plate 212. The fluorocarbon coating electrostatic spraying rotary cup atomizer structure uses a feed pipe 210 to feed the coating into a rotary cup 200. During feeding, the coating is cut by a perforated plate 213, breaking large streams of coating into smaller liquid flows or droplets, creating better conditions for the subsequent atomization process. Then, an arc-shaped reflector 212, in conjunction with a mounting column 211, reflects the coating flow sprayed from the perforated plate 213, increasing the contact area between the coating and the air and improving the atomization effect. Next, the coating is guided by a guide channel 220, while a baffle plate 230 is used to create a more complex flow pattern during the flow process, increasing the mixing degree between the coating and the air, further refining the coating particles, and thus improving the overall atomization effect.

[0034] Please refer to this carefully. Figures 1-3The right end of the feed pipe 210 is rotatably connected to a stainless steel cylinder 110 via a sealed bearing. A self-regulating electric heating tape 111 is spirally wound around the outer wall of the stainless steel cylinder 110. A heat insulation plate 120 is provided on the outer wall of the feed pipe 210, located between the rotary cup 200 and the stainless steel cylinder 110. The heat insulation plate 120 is fixedly connected to the inner wall of the housing 100 and movably connected to the feed pipe 210. A small DC brushless motor 130 is fixedly connected to the left side wall of the heat insulation plate 120. A first traction gear 131 is fixedly connected to the output shaft of the small DC brushless motor 130. A second traction gear 132 is fixedly connected to the outer wall of the feed pipe 210. 2 meshes with the first traction gear 131. Ball bearings are evenly distributed around the outer side wall of the rotary cup 200. A connecting pipe is fixedly connected to the middle of the right side wall of the stainless steel barrel 110. This fluorocarbon coating electrostatic spraying rotary cup atomizer structure heats the coating through the stainless steel barrel 110 in conjunction with the self-regulating electric heating tape 111, improving the fluidity of the coating and thus enhancing the subsequent atomization effect. Through the small DC brushless motor 130 in conjunction with the first traction gear 131 and the second traction gear 132, the rotation speed of the rotary cup 200 can be precisely controlled, so that the rotary cup 200 maintains a stable rotation speed, and the coating is evenly thrown out from the edge of the rotary cup 200 under the action of centrifugal force, thereby improving the smoothness and uniformity of the subsequent coating.

[0035] In use, this invention works as follows: When spraying fluorocarbon coatings, a stainless steel cylinder 110 is connected to a coating conveying device via a pipe body, and the coating is conveyed into the stainless steel cylinder 110. Then, the power supply to the self-regulating temperature-controlled electric heating tape 111 is turned on. The self-regulating temperature-controlled electric heating tape 111 heats the fluorocarbon coating in the stainless steel cylinder 110, thereby improving the fluidity of the fluorocarbon coating and allowing for better subsequent atomization. During heating, the heat insulation plate 120 provides insulation to prevent heat from affecting other components. Next, the power supply to the small DC brushless motor 130 is turned on. The output shaft of the small DC brushless motor 130 rotates, driving the first traction gear 131 to rotate. The first traction gear 131, through meshing, drives the second traction gear 132 to rotate. The second traction gear 132, in turn, drives the conveying pipe 210 to rotate. The conveying pipe 210, in turn, simultaneously drives the rotating cup 200 and the arc-shaped reflector 212 to rotate. Under the action of the conveying device, the coating passes through... The coating enters the rotary cup 200 through the feed pipe 210 and the orifice plate 213. The orifice plate 213 cuts the coating, dividing the large stream of coating into smaller liquid streams or droplets, creating better conditions for the subsequent atomization process. Then, the sprayed coating comes into contact with the arc-shaped reflector 212, which, in conjunction with the mounting column 211, reflects the coating stream sprayed from the orifice plate 213, increasing the contact area between the coating and the air, improving the atomization effect of the coating, and allowing the coating to enter the guide channel 220. The coating spreads evenly outward along the trajectory of the guide channel 220, which helps to control the flow path of the coating and prevent the coating from splashing or accumulating randomly. At the same time, the turbulence plate 230 makes the coating generate a more complex flow state during the flow process, breaking the original relatively stable flow state and forming more small vortices and turbulence, increasing the mixing degree between the coating and the air. Thus, through the above combination, the coating is evenly atomized and sprayed onto the object.

[0036] It should be noted that the paint conveying equipment mentioned above is existing technology. Commonly used equipment for paint conveying includes gear pumps, plunger pumps, or diaphragm pumps. Gear pumps use the meshing of gears to draw paint in from the inlet and force it out, resulting in a stable flow rate and precise control over the amount of paint conveyed. Plunger pumps utilize the reciprocating motion of the plunger to convey paint at higher pressures, making them suitable for conveying high-viscosity fluorocarbon paints. Diaphragm pumps convey paint through the reciprocating deformation of the diaphragm. Selecting different pumps for different situations is a common technique in this field.

[0037] The article mentions that when the speed of the small brushless DC motor 130 needs to be adjusted by the rotating cup 200, the average torque is changed by controlling the conduction time of the motor windings and adjusting the conduction time of the windings based on the motor speed feedback information. This is often combined with position sensors and PID control algorithms to improve the accuracy and stability of the control. This is an existing technology.

[0038] The self-regulating heating cable 111 mentioned in the article is an existing technology. The self-regulating heating cable consists of two parallel metal busbars and a conductive plastic in the middle. The heating principle is that after the current is turned on, the current passes through the conductive plastic and heats up the object. The self-regulating principle is based on the PTC characteristics of the conductive plastic. When the temperature is low, the carbon particles are close together, the resistance is low and the heat generation is high. When the temperature is high, the carbon particles are separated, the resistance is high and the heat generation is low, thereby automatically adjusting the temperature to ensure a constant heating temperature.

[0039] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A structure of a fluorocarbon coating electrostatic spray spin cup atomizer characterized by: The device includes a housing (100) and a rotary cup (200). The rotary cup (200) is disposed in the inner cavity of the housing (100). A feed pipe (210) is fixedly connected to the middle of the right side wall of the rotary cup (200). Mounting posts (211) are fixedly connected to the upper and lower sides of the left end of the feed pipe (210). An arc-shaped reflector plate (212) is fixedly connected to the ends of the two mounting posts (211). A perforated plate (213) is fixedly connected to the left side of the inner cavity wall of the feed pipe (210). The right end of the conveying pipe (210) is rotatably connected to a stainless steel cylinder (110) via a sealed bearing. The outer wall of the stainless steel cylinder (110) is spirally wound with a self-regulating electric heating tape (111).

2. The fluorocarbon paint electrostatic spray cup atomizer structure of claim 1, wherein: The arc-shaped reflector (212) is located inside the swivel cup (200). The inner wall of the swivel cup (200) has a guide groove (220). The guide grooves (220) are evenly distributed in a ring, and multiple guide grooves (220) are interconnected.

3. The fluorocarbon paint electrostatic spray cup atomizer structure of claim 2, wherein: The inner wall of the guide groove (220) is fixedly connected with a baffle plate (230), and the baffle plate (230) is evenly distributed and the shape of the baffle plate (230) is triangular.

4. The structure of the fluorocarbon coating electrostatic spraying rotary cup atomizer according to claim 1, characterized in that: The inner wall of the arc-shaped reflector (212) is coated with polytetrafluoroethylene.

5. The structure of the electrostatic spraying rotary cup atomizer for fluorocarbon coatings according to claim 1, characterized in that: The outer wall of the feed pipe (210) is provided with a heat insulation plate (120). The heat insulation plate (120) is located between the rotary cup (200) and the stainless steel barrel (110). The heat insulation plate (120) is fixedly connected to the inner wall of the shell (100) and is movably connected to the feed pipe (210).

6. The fluorocarbon coating electrostatic spraying rotary cup atomizer structure according to claim 5, characterized in that: A small brushless DC motor (130) is fixedly connected to the left side wall of the heat insulation plate (120). The output shaft of the small brushless DC motor (130) is fixedly connected to a first traction gear (131). A second traction gear (132) is fixedly connected to the outer side wall of the material conveying pipe (210). The second traction gear (132) meshes with the first traction gear (131).

7. The fluorocarbon coating electrostatic spraying rotary cup atomizer structure according to claim 1, characterized in that: The outer wall of the rotary cup (200) is uniformly provided with ball bearings, and a connecting pipe is fixedly connected to the middle of the right side wall of the stainless steel cylinder (110).

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