Electrostatic spraying device and method, electronic equipment and storage medium

Abstract

The invention discloses an electrostatic spraying device and method, electronic equipment and a storage medium. According to the electrostatic spraying device, a parameter combination optimization model is constructed, and the optimal parameter combination of electrode voltage and spraying distance is obtained through calculation based on the parameter combination optimization model in the mode of presetting the coating flow speed, the spraying pressure and the target charge-to-mass ratio; under the condition that the charge-to-mass ratio is restrained, the optimal electrostatic spraying parameter combination can be obtained through automatic calculation and adjusted and matched, the optimal electrode voltage can be adjusted and matched in a self-adaptive mode according to the spraying distance, the high-controllable self-adaptive adjusting capacity is achieved, and the uniformity of the electrostatic spraying deposition effect is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electrostatic spraying, and in particular to an electrostatic spraying device and method, electronic equipment, and a computer-readable storage medium. Background Art

[0002] Electrostatic spraying technology has developed rapidly at home and abroad and has been widely used. Its principle is to use a high-voltage electrostatic field to make negatively charged paint particles move in a directional manner in the opposite direction of the electric field under the action of the electric field force, and adsorb the paint particles on the surface of the workpiece. Among them, the paint particles have a large charge, and the ratio of the amount of charge obtained by the paint particles to their mass is called the charge-to-mass ratio q / m, which is an important parameter for measuring the effect of electrostatic spraying. Particles with a high charge-to-mass ratio can obtain a faster speed in the electric field, thereby increasing the adhesion efficiency of the paint and the workpiece surface, and improving the painting rate and the uniformity of the paint film. The charge-to-mass ratio depends on conventional electrostatic spraying parameters, such as the applied electrode voltage, spray flow, spray pressure and spray distance, but in the actual operation process, since the above-mentioned electrostatic spraying parameters are not consistent throughout the process, the charge-to-mass ratio q / m of the paint particles will fluctuate, resulting in poor uniformity of the paint film on the workpiece surface, and even paint film defects such as overspray and leak spray. Therefore, in order to ensure the effective deposition of electrostatic coating on the workpiece surface, it is necessary to adjust and match other parameters in real time according to the changes in some electrostatic spraying parameters to avoid the problem of uneven electrostatic coating effect caused by changes in the workpiece or parameters. Summary of the invention

[0003] The present invention provides an electrostatic spraying device and method, an electronic device, and a computer-readable storage medium, which can automatically solve the optimal electrostatic spraying parameter combination and adjust and match it under the condition of constraining the charge-to-mass ratio, and can adaptively adjust and match the optimal electrode voltage according to the spraying distance. It has a highly controllable adaptive adjustment capability, which greatly improves the uniformity of the electrostatic spraying deposition effect.

[0004] According to one aspect of the present invention, an electrostatic spraying device is provided, comprising a low-voltage electrostatic generator, a voltage converter, a data processing control module, a paint pumping unit, a flow sensor, an air compressor, a pressure sensing controller, an electrode induction electrostatic spray gun and a distance sensor, wherein the low-voltage electrostatic generator is used to provide voltage to the electrode of the electrode induction electrostatic spray gun, the voltage converter is used to adjust the electrode voltage of the electrode induction electrostatic spray gun, the paint pumping unit is used to provide paint to the electrode induction electrostatic spray gun, the flow sensor is used to measure the flow rate of the paint, the air compressor is used to provide spraying pressure to the electrode induction electrostatic spray gun, the pressure sensing controller is used to detect the spraying pressure, and the electrode induction electrostatic spray gun A gap is left between the electrode and the workpiece to be sprayed, which is used to spray paint particles onto the surface of the workpiece to be sprayed. The distance sensor is used to detect the spraying distance between the electrode of the electrode induction electrostatic spray gun and the surface of the workpiece to be sprayed. The voltage converter, flow sensor, pressure sensing controller and distance sensor are all electrically connected to the data processing control module. The data processing control module is used to construct a parameter combination optimization model, and the optimal parameter combination of electrode voltage and spraying distance is calculated based on the parameter combination optimization model by using the preset paint flow rate, spraying pressure and target charge-to-mass ratio, and the voltage converter is controlled to make corresponding voltage adjustments and to provide distance feedback through the distance sensor after adjusting the spraying distance.

[0005] Furthermore, the parameter combination optimization model is:

[0006]

[0007] Wherein, C represents the charge-to-mass ratio of the paint particles, x1, x2, x3 and x4 represent the electrode pressure, electrode diameter, spraying distance and spraying flow rate, respectively, wherein the spraying flow rate is related to the paint flow rate and the spraying pressure.

[0008] Furthermore, a current sensor is provided on the workpiece to be sprayed, which is electrically connected to the data processing control module and is used to detect the current of paint particles attached to the surface of the workpiece to be sprayed. After the electrostatic spraying is turned on, the data processing control module calculates the actual charge-to-mass ratio based on the real-time detection results of the flow sensor and the current sensor, and compares the deviation between the actual charge-to-mass ratio and the target charge-to-mass ratio, and decides whether to perform real-time correction of the electrode voltage based on the comparison result.

[0009] Furthermore, if the ratio of the actual charge-to-mass ratio to the target charge-to-mass ratio is within a preset range, there is no need to correct the electrode voltage; if the ratio of the actual charge-to-mass ratio to the target charge-to-mass ratio is not within the preset range, the data processing control module recalculates the corrected electrode pressure based on the parameter combination optimization model according to the various electrostatic spraying parameters detected in real time, and controls the voltage converter to perform real-time voltage correction.

[0010] Furthermore, the electrode induction electrostatic spray gun includes a nozzle housing, a conical air inlet base, a hydraulic nozzle and an annular hollow electrode, wherein the conical air inlet base, the hydraulic nozzle and the annular hollow electrode are arranged in sequence from back to front in the nozzle housing, and the annular hollow electrode is electrically connected to the voltage converter, and the conical air inlet base and the inner wall of the nozzle housing are combined to form a accommodating chamber, which is respectively connected to the paint pumping unit and the air compressor, so that the input paint and airflow are fully mixed in the accommodating chamber, and the conical air inlet base is used to compress the mixed paint airflow and then transport it to the hydraulic nozzle to prevent paint droplets from accumulating on the annular hollow electrode.

[0011] Furthermore, the hydraulic nozzle and the annular hollow electrode are co-centrically arranged.

[0012] In addition, the present invention also provides an electrostatic spraying method, using the electrostatic spraying device as described above, comprising the following contents:

[0013] Construct parameter combination optimization model;

[0014] The optimal parameter combination of electrode voltage and spraying distance is obtained by using the preset coating flow rate, spraying pressure and target charge-to-mass ratio based on the parameter combination optimization model;

[0015] The electrode voltage is adjusted according to the optimal electrode voltage parameters obtained by the solution, and the distance feedback is performed after adjusting the spraying distance.

[0016] Furthermore, the following contents are also included:

[0017] After electrostatic spraying is turned on, the paint flow rate and the current of paint particles attached to the surface of the workpiece to be sprayed are detected in real time and the actual charge-to-mass ratio is calculated. The deviation between the actual charge-to-mass ratio and the target charge-to-mass ratio is compared, and a decision is made based on the comparison result whether to make a real-time correction to the electrode voltage.

[0018] In addition, the present invention also provides an electronic device, including a processor and a memory, wherein the memory stores a computer program, and the processor executes the steps of the above method by calling the computer program stored in the memory.

[0019] In addition, the present invention also provides a computer-readable storage medium for storing a computer program for electrostatic spraying, wherein the computer program executes the steps of the method described above when running on a computer.

[0020] The present invention has the following beneficial effects:

[0021] The electrostatic spraying device of the present invention constructs a parameter combination optimization model, and adopts a preset coating flow rate, spraying pressure and target charge-to-mass ratio to solve the optimal parameter combination of electrode voltage and spraying distance based on the parameter combination optimization model. Under the condition of constraining the charge-to-mass ratio, the optimal electrostatic spraying parameter combination can be automatically solved and adjusted and matched. The optimal electrode voltage can be adaptively adjusted to match the spraying distance, and it has a highly controllable adaptive adjustment capability, which greatly improves the uniformity of the electrostatic spraying deposition effect.

[0022] In addition, the electrostatic spraying method of the present invention also has the above advantages.

[0023] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0025] Figure 1 It is a schematic diagram of the module structure of the electrostatic spraying device of the preferred embodiment of the present application;

[0026] Figure 2 It is a structural schematic diagram of an electrode induction electrostatic spray gun of a preferred embodiment of the present application;

[0027] Figure 3 is a schematic structural diagram of an electrode induction electrostatic spray gun of a preferred embodiment of the present application from another perspective;

[0028] Figure 4 is a schematic flow chart of an electrostatic spraying method according to another embodiment of the present application;

[0029] Figure 5 It is another flow chart of the electrostatic spraying method according to another embodiment of the present application.

[0030] Description of Reference Numerals

[0031] 1. Low-voltage electrostatic generator; 2. Voltage converter; 3. Data processing control module; 4. Paint pumping unit; 5. Flow sensor; 6. Air compressor; 7. Pressure sensing controller; 8. Electrode induction electrostatic spray gun; 9. Workpiece to be sprayed; 10. Distance sensor; 11. Nozzle housing; 12. Conical air inlet base; 13. Hydraulic nozzle; 14. Annular hollow electrode; 15. Current sensor. DETAILED DESCRIPTION

[0032] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0033] Reference Figure 1 The preferred embodiment of the present application provides an electrostatic spraying device, including a low-voltage electrostatic generator 1, a voltage converter 2, a data processing control module 3, a paint pumping unit 4, a flow sensor 5, an air compressor 6, a pressure sensing controller 7, an electrode induction electrostatic spray gun 8 and a distance sensor 10, wherein the low-voltage electrostatic generator 1 is used to provide voltage to the electrode of the electrode induction electrostatic spray gun 8, and the voltage converter 2 is used to adjust the electrode voltage of the electrode induction electrostatic spray gun 8. The voltage converter 2 is electrically connected to the low-voltage electrostatic generator 1 and the electrode induction electrostatic spray gun 8, respectively, and the voltage converter 2 adjusts the output voltage of the low-voltage electrostatic generator 1 and outputs it to the electrode of the electrode induction electrostatic spray gun 8. The paint pumping unit 4 is used to provide paint to the electrode induction electrostatic spray gun 8, and the flow sensor 5 is used to measure the flow rate of the paint, wherein the paint pumping unit 4 is connected to the electrode induction electrostatic spray gun 8, and the flow sensor 5 is arranged on the pipeline connecting the two, so as to detect the flow rate of the paint in real time. The air compressor 6 is connected to the electrode induction electrostatic spray gun 8, and the pressure sensing controller 7 is arranged on the pipeline connecting the two. The air compressor 6 is used to provide spraying pressure for the electrode induction electrostatic spray gun 8, and the pressure sensing controller 7 is used to detect the spraying pressure. A gap is left between the electrode induction electrostatic spray gun 8 and the workpiece 9 to be sprayed, which is used to spray the paint particles to the surface of the workpiece 9 to be sprayed, and the distance sensor 10 is used to detect the spraying distance between the electrode of the electrode induction electrostatic spray gun 8 and the surface of the workpiece 9 to be sprayed. The voltage converter 2, the flow sensor 5, the pressure sensing controller 7 and the distance sensor 10 are all electrically connected to the data processing control module 3, and the data processing control module 3 is used to construct a parameter combination optimization model, and the optimal parameter combination of the electrode voltage and the spraying distance is calculated based on the parameter combination optimization model by using the preset paint flow rate, the spraying pressure and the target charge-to-mass ratio, and the voltage converter 2 is controlled to make corresponding voltage adjustments and to provide distance feedback through the distance sensor 10 after adjusting the spraying distance. In addition, the data processing control module 3 can also be electrically connected to the low-voltage electrostatic generator 1, the paint pumping unit 4 and the air compressor 6, and it can also control the output voltage of the low-voltage electrostatic generator 1, the pumping speed of the paint pumping unit 4 and the air flow pressure output by the air compressor 6.

[0034] It can be understood that the electrostatic spraying device of this embodiment constructs a parameter combination optimization model, and adopts a preset paint flow rate, spraying pressure and target charge-to-mass ratio to solve the optimal parameter combination of electrode voltage and spraying distance based on the parameter combination optimization model. Under the condition of constraining the charge-to-mass ratio, the best electrostatic spraying parameter combination can be automatically solved and adjusted and matched. The optimal electrode voltage can be adaptively adjusted to match the spraying distance, and it has a highly controllable adaptive adjustment capability, which greatly improves the uniformity of the electrostatic spraying deposition effect.

[0035] Among them, the data processing control module 3 constructs a parameter combination optimization model based on the RSM method (Response Surface Methodology). The RSM method is a data model method used to explore the quantitative relationship between independent factors and response variables. It can find the best parameter matching combination within a certain process parameter range. The constructed parameter combination optimization model can provide decision-making reference and guidance for the adaptive matching adjustment of electrostatic spraying parameters under the condition of constraining the electrostatic spraying charge value (i.e., constraining the charge-to-mass ratio).

[0036] Specifically, the types of electrostatic spraying parameters are first determined, including spray flow rate, electrode voltage, spray distance and electrode diameter. The spray flow rate is related to the coating flow rate, spray width and spray pressure. After the spray gun model is selected, the electrode diameter is a known value. In order to facilitate control, the present invention adopts a strategy of keeping the coating flow rate, spray width and spray pressure unchanged, so that the spray flow rate remains stable. For example, the process parameters of the parameter combination optimization model are determined as shown in Table 1.

[0037] Table 1. Process parameters and their preset ranges of parameter combination optimization model

[0038] Process parameters Parameter Value Spraying flow rate (L / min) 0.5 Electrode voltage (kv) 5～20 Spraying distance (mm) 200-500 Electrode diameter (mm) 2

[0039] Then, the relationship between the above four process parameters and the charge-to-mass ratio was studied through single factor investigation experiments, the data required for the model was obtained and linear fitting was performed to obtain the parameter combination optimization model, which can be expressed as

[0040]

[0041] Wherein, C represents the charge-to-mass ratio of the paint particles, x1, x2, x3 and x4 represent the electrode pressure, electrode diameter, spraying distance and spraying flow rate, respectively, wherein the spraying flow rate is related to the paint flow rate and the spraying pressure.

[0042] Finally, under the premise of constraining the target charge-to-mass ratio, the parameter combination optimization model can be solved by hardware to obtain the best parameter combination of spraying distance and electrode voltage, and the voltage converter 2 is controlled to adjust according to the best electrode voltage, and the distance sensor 10 is used to perform cubic feedback in the process of adjusting the best spraying distance. In addition, the flow sensor 5 and the pressure sensor controller 7 can also be used to detect the real-time paint flow rate and spraying pressure to ensure that the paint flow rate and spraying pressure remain unchanged, so that the spraying flow rate remains stable.

[0043] Preferably, a current sensor 15 is also provided on the workpiece 9 to be sprayed, which is electrically connected to the data processing control module 3 and is used to detect the current of the paint particles attached to the surface of the workpiece 9 to be sprayed. After the electrostatic spraying is turned on, the data processing control module 3 calculates the actual charge-to-mass ratio based on the real-time detection results of the flow sensor 5 and the current sensor 15. The calculation formula is: C = q / m = I s / V m , I s represents the paint particle current, which is detected in real time by the current sensor 15, V m Represents the coating flow rate, which is detected in real time by the flow sensor 5, and the actual charge-to-mass ratio is compared with the target charge-to-mass ratio for deviation, and whether to perform real-time correction of the electrode voltage is determined based on the comparison result. If the ratio of the actual charge-to-mass ratio C1 to the target charge-to-mass ratio C2 is within the preset interval, it is considered that the charge-to-mass ratio of the electrostatic spraying particles is relatively stable at this time, and no electrode voltage correction is required; if the ratio of the actual charge-to-mass ratio C1 to the target charge-to-mass ratio C2 is not within the preset interval, the data processing control module 3 calculates the corrected electrode pressure again based on the parameter combination optimization model according to the various electrostatic spraying parameters detected in real time, and controls the voltage converter 2 to perform real-time voltage correction, so as to always keep the actual charge-to-mass ratio of the electrostatic spraying within a stable range, achieve a high-precision and high-stability electrostatic spraying effect, and further improve the uniformity of the electrostatic spraying. Among them, the preset interval can be set according to actual needs, for example, set to [0.8, 1.2], [0.9, 1.1], etc.

[0044] In addition, if Figure 2 and Figure 3As shown, the electrode induction electrostatic spray gun 8 includes a nozzle housing 11, a conical air inlet base 12, a hydraulic nozzle 13 and an annular hollow electrode 14. The conical air inlet base 12, the hydraulic nozzle 13 and the annular hollow electrode 14 are arranged in sequence from back to front in the nozzle housing 11. The hydraulic nozzle 13 has a nozzle bracket, and the annular hollow electrode 14 has an electrode seat. The annular hollow electrode 14 is electrically connected to the voltage converter 2. The conical air inlet base 12 and the inner wall of the nozzle housing 11 are surrounded to form a receiving chamber, which is respectively connected to the paint pumping unit 4 and the air compressor 6, so that the input paint and airflow are fully mixed in the receiving chamber. The conical air inlet base 12 can also compress the mixed paint airflow and then transport it to the hydraulic nozzle 13, so as to avoid the turbulent flow of the paint and airflow in the entire housing, and prevent the paint droplets from accumulating on the annular hollow electrode 14, so as to ensure that the electrode surface is dry, avoid electrode contamination, reduce the later maintenance of the spray gun, and ensure the acceleration effect of the electric field. The nozzle housing 11 is made of stainless steel. Preferably, the hydraulic nozzle 13 and the annular hollow electrode 14 are co-centered to ensure that the paint droplets can carry charges evenly as soon as they leave the nozzle outlet, further improving the uniformity of electrostatic spraying; as a further preferred embodiment, the airflow inlet, the conical air inlet base 12, the hydraulic nozzle 13 and the annular hollow electrode 14 on the nozzle housing 11 are all coaxially arranged, so that the paint droplets obtain a higher speed when leaving the nozzle outlet, which is beneficial to improving the adhesion effect of the paint on the workpiece surface, thereby improving the painting rate and the uniformity of the paint film.

[0045] In addition, if Figure 4 As shown, another embodiment of the present invention further provides an electrostatic spraying method, preferably using the electrostatic spraying device as described above, comprising the following contents:

[0046] Step S1: construct a parameter combination optimization model;

[0047] Step S2: using a preset coating flow rate, spraying pressure and target charge-to-mass ratio to calculate an optimal parameter combination of electrode voltage and spraying distance based on a parameter combination optimization model;

[0048] Step S3: adjusting the electrode voltage according to the optimal electrode voltage parameters obtained by the solution, and performing distance feedback after adjusting the spraying distance.

[0049] It can be understood that the electrostatic spraying method of this embodiment, by constructing a parameter combination optimization model, adopts the preset coating flow rate, spraying pressure and target charge-to-mass ratio to solve the optimal parameter combination of electrode voltage and spraying distance based on the parameter combination optimization model. Under the condition of constraining the charge-to-mass ratio, the best electrostatic spraying parameter combination can be automatically solved and adjusted and matched. The optimal electrode voltage can be adaptively adjusted to match the spraying distance. It has highly controllable adaptive adjustment capabilities, which greatly improves the uniformity of the electrostatic spraying deposition effect.

[0050] Among them, the parameter combination optimization model is:

[0051]

[0052] Wherein, C represents the charge-to-mass ratio of the paint particles, x1, x2, x3 and x4 represent the electrode pressure, electrode diameter, spraying distance and spraying flow rate, respectively, wherein the spraying flow rate is related to the paint flow rate and the spraying pressure.

[0053] In addition, if Figure 5 As shown, the electrostatic spraying method also includes the following contents:

[0054] Step S4: After the electrostatic spraying is turned on, the paint flow rate and the current of the paint particles attached to the surface of the workpiece to be sprayed are detected in real time and the actual charge-to-mass ratio is calculated. The actual charge-to-mass ratio is compared with the target charge-to-mass ratio for deviation, and it is determined whether to perform real-time correction of the electrode voltage based on the comparison result.

[0055] Specifically, after the electrostatic spraying starts, the paint particle current is detected in real time by the current sensor, and the paint flow rate is detected in real time by the flow sensor, and the formula C = q / m = I s / V m The actual charge-to-mass ratio is calculated, and the actual charge-to-mass ratio is compared with the target charge-to-mass ratio for deviation, and whether to perform real-time correction of the electrode voltage is determined based on the comparison result. For example, if the ratio of the actual charge-to-mass ratio C1 to the target charge-to-mass ratio C2 is within the preset interval, it is considered that the charge-to-mass ratio of the electrostatic spraying particles is relatively stable at this time, and no electrode voltage correction is required; if the ratio of the actual charge-to-mass ratio C1 to the target charge-to-mass ratio C2 is not within the preset interval, the corrected electrode pressure is calculated again based on the parameter combination optimization model according to the real-time detected electrostatic spraying parameters, and the voltage converter 2 is controlled to perform real-time voltage correction, so as to always keep the actual charge-to-mass ratio of the electrostatic spraying within a stable range, achieve a high-precision and high-stability electrostatic spraying effect, and further improve the uniformity of the electrostatic spraying. Among them, the preset interval can be set according to actual needs, for example, set to [0.8, 1.2], [0.9, 1.1], etc.

[0056] In addition, another embodiment of the present invention further provides an electronic device, including a processor and a memory, wherein the memory stores a computer program, and the processor executes the steps of the above method by calling the computer program stored in the memory.

[0057] In addition, another embodiment of the present invention further provides a computer-readable storage medium for storing a computer program for electrostatic spraying, wherein the computer program executes the steps of the method described above when running on a computer.

[0058] The general form of computer readable storage media includes: floppy disk, flexible disk, hard disk, magnetic tape, any other magnetic medium, CD-ROM, any other optical medium, punch cards, paper tape, any other physical medium with a pattern of holes, random access memory (RAM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), flash erasable programmable read-only memory (FLASH-EPROM), any other memory chip or cartridge, or any other medium that can be read by a computer. The instructions can further be transmitted or received by a transmission medium. The term transmission medium can include any tangible or intangible medium that can be used to store, encode or carry instructions for execution by a machine, and includes digital or analog communication signals or other intangible media that facilitate the communication of the above instructions. Transmission media include coaxial cables, copper wires and optical fibers, which include the wires of a bus used to transmit a computer data signal.

[0059] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of complete hardware embodiments, complete software embodiments, or embodiments in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code. The scheme in the embodiments of the present application can be implemented in various computer languages, for example, object-oriented programming language Java and literal scripting language JavaScript, etc.

[0060] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0061] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0062] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0063] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0064] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An electrostatic spraying device, characterized in that: The invention comprises a low-voltage electrostatic generator (1), a voltage converter (2), a data processing control module (3), a paint pumping unit (4), a flow sensor (5), an air compressor (6), a pressure sensing controller (7), an electrode induction electrostatic spray gun (8) and a distance measuring sensor (10), wherein the low-voltage electrostatic generator (1) is used to provide a voltage to an electrode of the electrode induction electrostatic spray gun (8), the voltage converter (2) is used to adjust the electrode voltage of the electrode induction electrostatic spray gun (8), the paint pumping unit (4) is used to provide paint to the electrode induction electrostatic spray gun (8), the flow sensor (5) is used to measure the flow rate of the paint, the air compressor (6) is used to provide a spraying pressure to the electrode induction electrostatic spray gun (8), the pressure sensing controller (7) is used to detect the spraying pressure, and the electrode induction electrostatic spray gun (8) and the distance measuring sensor (10) are connected to each other. A gap is left between the workpieces (9) to be sprayed, which is used to spray paint particles onto the surface of the workpieces (9) to be sprayed. The distance sensor (10) is used to detect the spraying distance between the electrode of the electrode induction electrostatic spray gun (8) and the surface of the workpiece (9) to be sprayed. The voltage converter (2), the flow sensor (5), the pressure sensing controller (7) and the distance sensor (10) are all electrically connected to the data processing control module (3). The data processing control module (3) is used to construct a parameter combination optimization model, and the optimal parameter combination of electrode voltage and spray distance is calculated based on the parameter combination optimization model by using a preset paint flow rate, spray pressure and target charge-to-mass ratio, and the voltage converter (2) is controlled to perform corresponding voltage adjustment and to perform distance feedback through the distance sensor (10) after adjusting the spraying distance.

2. The electrostatic spraying device according to claim 1, characterized in that: The parameter combination optimization model is: C=3.58+1.39x1+0.68x2-1.18x3+0.64x1x2-0.78x1x4-1.76x2 2 Wherein, C represents the charge-to-mass ratio of the paint particles, x1, x2, x3 and x4 represent the electrode pressure, electrode diameter, spraying distance and spraying flow rate, respectively, wherein the spraying flow rate is related to the paint flow rate and the spraying pressure.

3. The electrostatic spraying device according to claim 1, characterized in that: A current sensor (15) is provided on the workpiece (9) to be sprayed and is electrically connected to the data processing control module (3) for detecting the current of the paint particles attached to the surface of the workpiece (9) to be sprayed. After the electrostatic spraying is turned on, the data processing control module (3) calculates the actual charge-to-mass ratio based on the real-time detection results of the flow sensor (5) and the current sensor (15), compares the deviation between the actual charge-to-mass ratio and the target charge-to-mass ratio, and determines whether to perform real-time correction of the electrode voltage based on the comparison result.

4. The electrostatic spraying device according to claim 3, characterized in that: If the ratio of the actual charge-to-mass ratio to the target charge-to-mass ratio is within a preset range, there is no need to correct the electrode voltage; if the ratio of the actual charge-to-mass ratio to the target charge-to-mass ratio is not within the preset range, the data processing control module (3) recalculates the corrected electrode pressure based on the parameter combination optimization model according to the various electrostatic spraying parameters detected in real time, and controls the voltage converter (2) to perform real-time voltage correction.

5. The electrostatic spraying device according to claim 1, characterized in that: The electrode induction electrostatic spray gun (8) comprises a nozzle housing (11), a conical air inlet base (12), a hydraulic nozzle (13) and an annular hollow electrode (14). The conical air inlet base (12), the hydraulic nozzle (13) and the annular hollow electrode (14) are arranged in sequence from back to front in the nozzle housing (11). The annular hollow electrode (14) is electrically connected to a voltage converter (2). The conical air inlet base (12) and the inner wall of the nozzle housing (11) are combined to form a receiving chamber, which is respectively connected to a paint pumping unit (4) and an air compressor (6) so that the input paint and airflow are fully mixed in the receiving chamber. The conical air inlet base (12) is used to compress the mixed paint airflow and then transport it to the hydraulic nozzle (13) to prevent paint droplets from accumulating on the annular hollow electrode (14).

6. The electrostatic spraying device according to claim 5, characterized in that: The hydraulic nozzle (13) and the annular hollow electrode (14) are co-centrically arranged.

7. An electrostatic spraying method, using the electrostatic spraying device according to any one of claims 1 to 6, characterized in that: Includes the following: Construct parameter combination optimization model; The optimal parameter combination of electrode voltage and spraying distance is obtained by using the preset coating flow rate, spraying pressure and target charge-to-mass ratio based on the parameter combination optimization model; The electrode voltage is adjusted according to the optimal electrode voltage parameters obtained by the solution, and the distance feedback is performed after adjusting the spraying distance.

8. The electrostatic spraying method according to claim 7, characterized in that: Also included are the following: After electrostatic spraying is turned on, the paint flow rate and the current of paint particles attached to the surface of the workpiece to be sprayed are detected in real time and the actual charge-to-mass ratio is calculated. The deviation between the actual charge-to-mass ratio and the target charge-to-mass ratio is compared, and a decision is made based on the comparison result whether to make a real-time correction to the electrode voltage.

9. An electronic device, characterized in that: It comprises a processor and a memory, wherein a computer program is stored in the memory, and the processor is used to execute the steps of the method according to claim 7 or 8 by calling the computer program stored in the memory.

10. A computer-readable storage medium for storing a computer program for electrostatic spraying, characterized in that: The computer program executes the steps of the method according to claim 7 or 8 when running on a computer.

Images