Electrostatic coating method
Through the electrostatic coating method, the coating is carried with an electrostatic field, and the rotating spray gun atomizes the paint and sprays it onto the workpiece to be sprayed, solving the problems of waste and pollution of existing painting methods and achieving an efficient and environmentally friendly coating effect.
Patent Information
- Application Number
- CN202510296652.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-13
- Publication Date
- 2025-04-25
AI Technical Summary
The existing spray painting method has low utilization rate of paint, which has waste, increases the manufacturing cost of electric bicycles and causes pollution to the environment.
The electrostatic coating method is adopted, by passing the paint into the spray gun and forming an electrostatic field between the workpiece to be sprayed and the spray gun, the corona discharge is used to make the paint carry charge, and the rotary spray gun atomizes the paint and sprays it onto the workpiece to be sprayed to achieve uniform deposition.
It significantly improves the transfer efficiency of the paint, reduces the waste of paint, reduces costs and environmental pollution, and improves the quality of the coating.
Smart Images
Figure CN119869885A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of plastic part coating, and in particular to an electrostatic coating method. Background Art
[0002] With the aggravation of urban traffic congestion and the improvement of people's environmental awareness, the market demand for electric bicycles as a convenient short-distance travel tool continues to grow. Like other motor vehicles, electric bicycles need to withstand the sun and rain. In order to protect their exposed parts and make the appearance of electric bicycles more beautiful, some parts of electric bicycles need to be painted.
[0003] The existing painting method is to use a spray gun to directly spray paint on the surface of the parts to form a paint film. This method does not use a high paint rate and there is a certain amount of waste, which increases the manufacturing cost of the electric bicycle and is not conducive to improving its product competitiveness. Moreover, the wasted paint will also pollute the environment. Summary of the invention
[0004] The purpose of this application is to provide an electrostatic coating method to address the deficiencies in the above-mentioned prior art, which can improve the painting rate and reduce pollution to the environment.
[0005] To achieve the above purpose, the technical solution adopted in the embodiment of the present application is as follows:
[0006] An embodiment of the present application provides an electrostatic coating method, comprising: providing paint, a spray gun and a workpiece to be sprayed, and passing the paint into the spray gun; making one of the workpiece to be sprayed and the spray gun carry a positive charge and the other carry a negative charge, so as to form an electrostatic field between the workpiece to be sprayed and the spray gun, and the electrostatic field causes the air outside the spray gun nozzle of the spray gun to produce corona discharge; the spray gun rotates to atomize the paint and then sprays it onto the workpiece to be sprayed, and when the paint passes through the spray gun nozzle, it carries the same type of charge as the spray gun due to corona discharge, and the paint is deposited on the surface of the workpiece to be sprayed under the adsorption effect of the workpiece to be sprayed.
[0007] Optionally, making one of the workpiece to be sprayed and the spray gun carry positive charge and the other carry negative charge includes: connecting the spray gun to the negative pole of the power supply and grounding the workpiece to be sprayed, so that the spray gun carries positive charge and the workpiece to be sprayed carries negative charge.
[0008] Optionally, the spray gun includes a gun body, a bell cup disposed on the gun body, and a drive assembly, wherein the drive assembly is used to drive the bell cup to rotate; and passing the paint into the spray gun includes: passing the paint into the bell cup.
[0009] Optionally, the spray gun port is located on the bell, and the distance between the spray gun port and the surface of the workpiece to be sprayed is 50 mm-250 mm.
[0010] Optionally, passing the coating into the spray gun includes: passing the coating into the spray gun using a gear pump.
[0011] Optionally, the electrostatic coating method further includes: providing a robotic arm and fixing the spray gun on the robotic arm, wherein the robotic arm is used to move the position of the spray gun.
[0012] Optionally, a moving component is provided, and the workpiece to be sprayed is fixed on the moving component, and the moving component is used to adjust the position of the workpiece to be sprayed.
[0013] Optionally, the moving component is used to rotate and move the workpiece to be sprayed; the number of spray guns is two, and the two spray guns are arranged at intervals along the moving path of the moving component; the spray guns rotate to atomize the paint and spray it onto the workpiece to be sprayed, including: the moving component drives the first surface of the workpiece to be sprayed to align with the spray gun nozzle of the first spray gun; the first spray gun rotates to atomize the paint and spray it onto the first surface; the moving component drives the second surface of the workpiece to be sprayed to align with the spray gun nozzle of the second spray gun; the second spray gun rotates to atomize the paint and spray it onto the second surface.
[0014] Optionally, after the spray gun rotates to atomize the paint and sprays it onto the workpiece to be sprayed, the electrostatic coating method further comprises: manually spraying additional paint onto the surface of the workpiece to be sprayed.
[0015] Optionally, after the spray gun rotates to atomize the paint and then sprays it toward the workpiece to be sprayed, the electrostatic coating method further includes: curing the paint.
[0016] The beneficial effects of this application include:
[0017] The present application provides an electrostatic coating method, including: providing a coating, a spray gun and a workpiece to be sprayed, and passing the coating into the spray gun; making one of the workpiece to be sprayed and the spray gun carry a positive charge and the other carry a negative charge, so as to form an electrostatic field between the workpiece to be sprayed and the spray gun, and the electrostatic field causes the air outside the spray gun nozzle of the spray gun to generate corona discharge; the spray gun rotates to atomize the coating and then sprays it to the workpiece to be sprayed, and the coating carries the same type of charge as the spray gun due to corona discharge when passing through the spray gun nozzle, and the coating is adsorbed by the workpiece to be sprayed and deposited on the surface of the workpiece to be sprayed. The electrostatic coating method utilizes the electrostatic field to significantly improve the transfer efficiency of the coating, reduce the waste of the coating, and thus reduce the cost and pollution to the environment. At the same time, under the action of the electrostatic field, the atomized paint particles can be evenly attached to the surface of the workpiece to be sprayed, thereby improving the coating quality. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.
[0019] Figure 1 One of the flow charts of the electrostatic coating method provided in the embodiment of the present application;
[0020] Figure 2 One of the spraying schematic diagrams of the electrostatic coating method provided in the embodiment of the present application;
[0021] Figure 3 A schematic diagram of the structure of a mechanical arm and a spray gun used in the electrostatic coating method provided in an embodiment of the present application;
[0022] Figure 4 The second spraying schematic diagram of the electrostatic coating method provided in the embodiment of the present application;
[0023] Figure 5 This is the second flow chart of the electrostatic coating method provided in the embodiment of the present application.
[0024] Icons: 10- spray gun; 11- spray gun nozzle; 20- workpiece to be sprayed; 21- first surface; 22- second surface; 30- electrostatic field; 40- charged paint particles; 50- robotic arm; 60- moving path. DETAILED DESCRIPTION
[0025] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.
[0026] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. It should be noted that, in the absence of conflict, the various features in the embodiments of the present application can be combined with each other, and the combined embodiments are still within the scope of protection of the present application.
[0027] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.
[0028] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.
[0029] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0030] Please refer to Figure 1 , the present application embodiment provides an electrostatic coating method, comprising:
[0031] S100: Provide paint, a spray gun and a workpiece to be sprayed, and pass the paint into the spray gun.
[0032] Please refer to Figure 2 and Figure 3 , the paint is sprayed onto the surface of the workpiece 20 to be sprayed through the spraying action of the spray gun 10. The spray gun 10 may be an electrostatic rotary cup spray gun 10. The workpiece 20 to be sprayed is generally fixed on a fixture, and the fixture may also be fixed on a moving component, so that the workpiece 20 to be sprayed can be rotated or moved to cooperate with the spraying of the spray gun 10. Similarly, the spray gun 10 may also be fixed on a mechanical arm 50, so that the spray gun 10 can be moved or adjusted in angle.
[0033] S200: one of the workpiece to be sprayed and the spray gun is made to carry positive charge and the other is made to carry negative charge, so as to form an electrostatic field between the workpiece to be sprayed and the spray gun, and the electrostatic field causes corona discharge in the air outside the spray gun nozzle of the spray gun.
[0034] In this embodiment, there is no limitation on the method of charging the workpiece 20 to be sprayed and the spray gun 10. One of the workpiece 20 to be sprayed and the spray gun 10 is used as a positive electrode and the other is used as a negative electrode, so that an electrostatic field 30 can be formed between the two. When the intensity of the electrostatic field 30 is high enough, the air near the spray gun port 11 will be ionized to generate corona discharge.
[0035] S300: The spray gun rotates to atomize the paint and then spray it toward the workpiece to be sprayed. When the paint passes through the spray gun nozzle, it carries the same type of charge as the spray gun due to corona discharge. The paint is adsorbed by the workpiece to be sprayed and deposited on the surface of the workpiece to be sprayed.
[0036] When the paint is sent to the high-speed rotating spray gun 10, the paint is stretched into a thin film on the inner surface of the spray gun 10 due to the centrifugal effect generated by the rotation of the spray gun 10, and moves toward the spray gun port 11 with great acceleration. The paint film is broken into extremely fine droplets at the spray gun port 11 under the action of centrifugal force, thereby achieving atomization.
[0037] When the atomized paint passes through the spray gun nozzle 11, it carries the same type of charge as the spray gun 10, and becomes charged paint particles 40. When these charged paint particles 40 pass through the corona discharge area, they will further combine with ionized air and be charged again. Under the action of the high-voltage electrostatic field 30, the charged paint particles 40 move toward the workpiece 20 to be sprayed with the opposite polarity, and are deposited on the surface of the workpiece 20 to be sprayed, forming a uniform and firmly adhered coating.
[0038] The electrostatic coating method mentioned above utilizes the electrostatic field 30 to significantly improve the transfer efficiency of the paint, reduce the waste of the paint, and thus reduce the cost and pollution to the environment. At the same time, under the action of the electrostatic field 30, the atomized paint particles can be evenly attached to the surface of the workpiece 20 to be sprayed, thereby improving the coating quality.
[0039] Optionally, causing one of the workpiece to be sprayed and the spray gun to carry a positive charge and the other to carry a negative charge comprises:
[0040] Connect the spray gun to the negative pole of the power supply and the workpiece to be sprayed to the ground, so that the spray gun carries a positive charge and the workpiece to be sprayed carries a negative charge.
[0041] At this time, the atomized paint particles will also carry negative charges after leaving the spray gun 10, and move toward the workpiece 20 to be sprayed, which carries positive charges, under the action of the electrostatic field 30. The paint particles carrying negative charges can effectively attract the cations in the workpiece 20 to be sprayed, thereby achieving the deposition of the paint on the workpiece 20 to be sprayed. In addition, the negatively charged paint particles can better adsorb on the surface of the workpiece 20 to be sprayed, and make the paint more evenly distributed to form a high-quality coating. Moreover, making the spray gun 10 carry positive charges and the workpiece 20 to be sprayed carry negative charges can also make spraying safer.
[0042] Optionally, the spray gun 10 includes a gun body, a bell cup disposed on the gun body, and a drive assembly, wherein the drive assembly is used to drive the bell cup to rotate.
[0043] Passing the paint into the spray gun includes: passing the paint into the swirl cup.
[0044] The bell rotates at high speed under the drive of the driving assembly, and after the paint enters the bell, it stretches into a thin film on the inner surface of the bell. When the paint film moves to the spray gun port 11 on the bell, it is cut by the edge of the spray gun port 11, thus breaking into extremely fine droplets.
[0045] Optionally, the spray gun port 11 is located on the bell, and the distance between the spray gun port 11 and the surface of the workpiece 20 to be sprayed is 50 mm-250 mm.
[0046] Spraying the workpiece 20 to be sprayed within this distance range can not only allow the paint to cover a large area of the surface of the workpiece 20 to be sprayed, but also improve the safety of spraying.
[0047] Optionally, passing the coating into the spray gun includes: passing the coating into the spray gun using a gear pump.
[0048] The gear pump can efficiently and stably deliver the paint to the spray gun 10, thereby improving the spraying quality and reducing the waste of paint.
[0049] Optionally, the electrostatic coating method further includes: providing a robotic arm and fixing the spray gun on the robotic arm, wherein the robotic arm is used to move the position of the spray gun.
[0050] Before spraying, the spray gun 10 is fixed on the mechanical arm 50, and the mechanical arm 50 can drive the spray gun 10 to move or adjust the angle, so that the spray gun 10 is aimed at different areas of the workpiece 20 to be sprayed, so as to ensure that the surface to be sprayed can be evenly covered by the paint. In addition, the cooperation between the mechanical arm 50 and the spray gun 10 can also save manpower.
[0051] Optionally, the electrostatic coating method further includes: providing a moving component and fixing the workpiece to be sprayed on the moving component, wherein the moving component is used to adjust the position of the workpiece to be sprayed.
[0052] Before spraying, the workpiece 20 to be sprayed is fixed on the moving component, and the moving component can drive the workpiece 20 to be sprayed to move position and / or adjust the angle, so that the workpiece 20 to be sprayed is aligned with the spray gun nozzle 11 of the spray gun 10 to ensure that the paint sprayed by the spray gun 10 can be smoothly transferred to the surface of the workpiece 20 to be sprayed.
[0053] It should be noted that in this embodiment, the structure of the moving component is not limited, as long as it can change the position and / or angle of the workpiece 20 to be sprayed. For example, the moving component is a mechanical arm with a clamp, and the workpiece 20 to be sprayed is fixed on the clamp. The mechanical arm can control the rotation of the clamp to rotate the workpiece 20 to be sprayed, and the mechanical arm can also move along a preset path to change the position of the workpiece 20 to be sprayed.
[0054] Optionally, see Figure 4The moving assembly is used to rotate and move the workpiece 20 to be sprayed; there are two spray guns 10, and the two spray guns 10 are arranged at intervals along the moving path 60 of the moving assembly.
[0055] Please refer to Figure 5 The spray gun rotates to atomize the paint and spray it onto the workpiece to be sprayed, including:
[0056] S310: The moving component drives the first surface of the workpiece to be sprayed to align with the spray gun port of the first spray gun.
[0057] S320: The first spray gun rotates to atomize the paint and spray it toward the first surface.
[0058] S330: The moving component drives the second surface of the workpiece to be sprayed to align with the spray gun port of the second spray gun.
[0059] S340: The second spray gun rotates to atomize the paint and spray it onto the second surface.
[0060] The two spray guns 10 are respectively arranged at a first position and a second position, and the workpiece 20 to be sprayed is fixed on the moving assembly, and the moving assembly can drive the workpiece 20 to be sprayed to move to the first position, and then move from the first position to the second position. In the process of moving from the first position to the second position, the moving assembly can drive the workpiece 20 to be sprayed to rotate. Therefore, driven by the moving assembly, when the workpiece 20 to be sprayed moves to the first position, its first surface 21 is aligned with the first spray gun 10, and when the workpiece 20 to be sprayed moves to the second position, its second surface 22 is aligned with the second spray gun 10. In this way, the two surfaces of the workpiece 20 to be sprayed can be sprayed respectively using the two spray guns 10.
[0061] Optionally, after the spray gun rotates to atomize the paint and sprays it onto the workpiece to be sprayed, the electrostatic coating method further comprises: manually spraying additional paint onto the surface of the workpiece to be sprayed.
[0062] After the spraying of the spray gun 10 is completed, the surface of the workpiece 20 to be sprayed is checked. If the spraying effect of some areas is not good, paint can be sprayed on the surface of the workpiece 20 to be sprayed manually to further improve the quality of the surface coating of the workpiece 20 to be sprayed.
[0063] Optionally, after the spray gun rotates to atomize the paint and then sprays it toward the workpiece to be sprayed, the electrostatic coating method further includes: curing the paint.
[0064] After the coating is deposited on the surface of the workpiece 20 to be sprayed, the coating is cured to form a fixed coating. The curing method may be natural curing, radiation curing, or solvent evaporation curing.
[0065] It should be understood that, although the various steps in the flow chart are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless there is a clear description in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flow chart may include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.
[0066] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. An electrostatic coating method, characterized in that: include: Providing paint, a spray gun and a workpiece to be sprayed, and passing the paint into the spray gun; One of the workpiece to be sprayed and the spray gun is made to carry positive charge and the other is made to carry negative charge, so as to form an electrostatic field between the workpiece to be sprayed and the spray gun, and the electrostatic field causes the air outside the spray gun port of the spray gun to generate corona discharge; The spray gun rotates to atomize the paint and then spray it toward the workpiece to be sprayed. When the paint passes through the spray gun nozzle, the corona discharge carries the same type of charge as the spray gun. The paint is adsorbed by the workpiece to be sprayed and deposited on the surface of the workpiece to be sprayed.
2. The electrostatic coating method according to claim 1, characterized in that: The step of causing one of the workpiece to be sprayed and the spray gun to carry a positive charge and the other to carry a negative charge comprises: The spray gun is connected to the negative pole of the power supply and the workpiece to be sprayed is grounded, so that the spray gun carries a positive charge and the workpiece to be sprayed carries a negative charge.
3. The electrostatic coating method according to claim 1, characterized in that: The spray gun comprises a gun body, a bell cup arranged on the gun body and a driving assembly, wherein the driving assembly is used to drive the bell cup to rotate; The step of passing the coating into the spray gun comprises: The coating is passed into the rotary cup.
4. The electrostatic coating method according to claim 3, characterized in that: The spray gun port is located on the bell, and the distance between the spray gun port and the surface of the workpiece to be sprayed is 50mm-250mm.
5. The electrostatic coating method according to claim 1, characterized in that: The step of passing the coating into the spray gun comprises: A gear pump is used to pass the coating into the spray gun.
6. The electrostatic coating method according to claim 1, characterized in that: Also includes: A mechanical arm is provided, and the spray gun is fixed on the mechanical arm, and the mechanical arm is used to move the position of the spray gun.
7. The electrostatic coating method according to claim 1, characterized in that: Also includes: A moving component is provided, and the workpiece to be sprayed is fixed on the moving component, and the moving component is used to adjust the position of the workpiece to be sprayed.
8. The electrostatic coating method according to claim 7, characterized in that: The moving assembly is used to rotate and move the workpiece to be sprayed; the number of the spray guns is two, and the two spray guns are arranged at intervals along the moving path of the moving assembly; The spray gun rotates to atomize the coating and then sprays it toward the workpiece to be sprayed, comprising: The moving assembly drives the first surface of the workpiece to be sprayed to align with the spray gun port of the first spray gun; The first spray gun rotates to atomize the coating and spray it toward the first surface; The moving assembly drives the second surface of the workpiece to be sprayed to align with the spray gun port of the second spray gun; The second spray gun rotates to atomize the coating material and spray it toward the second surface.
9. The electrostatic coating method according to claim 2, characterized in that: After the spray gun rotates to atomize the paint and sprays it toward the workpiece to be sprayed, the electrostatic coating method further includes: The coating is manually sprayed onto the surface of the workpiece to be sprayed.
10. The electrostatic coating method according to claim 1, characterized in that: After the spray gun rotates to atomize the paint and sprays it toward the workpiece to be sprayed, the electrostatic coating method further includes: The coating is cured.