High voltage electrostatic spraying control system and control method

Abstract

The present invention discloses a high-voltage electrostatic spraying control system and a control method, and relates to the technical field of electrostatic powder spraying control. The high-voltage electrostatic spraying control system includes a main control unit, a high-voltage driving unit, an external trigger signal generating unit, a spray gun interface signal processing unit, and an air pressure signal processing unit. The high-voltage electrostatic spraying control method includes the following steps: generating an external trigger signal and sending it to the high-voltage driving unit; optically isolating the external switch trigger signal and sending it to the main control unit, and generating a circuit switch signal and an air circuit switch signal according to the feedback signal; the main control unit receives the switch trigger signal and generates a feedback signal as well as PWM and DAC signals; the spray gun interface signal processing unit receives the circuit switch signal and controls the voltage output; and the air pressure signal processing unit receives the air circuit switch signal. The present invention realizes automatic control of four variables: electrostatic voltage, electrostatic current, flow rate pressure, and atomization pressure.

Description

Technical Field

[0001] The invention relates to the technical field of electrostatic powder spraying control, in particular to a high-voltage electrostatic spraying control system and a control method. Background Art

[0002] Since powder coating uses electrostatic spraying, the coating equipment can be almost fully automated, saving human resources. Even if manual assistance is required, the coating personnel do not need to undergo long-term training to master the operating skills. Powder coating is 100% solid and does not require any solvents, so the amount of coating is reduced, saving packaging and reducing storage space.

[0003] Powder coatings do not produce organic volatiles, thus avoiding waste caused by volatilization into the atmosphere. Therefore, compared with liquid coatings, energy costs are greatly reduced. Electrostatic spraying equipment can obtain a thick film in one spraying, without the need for repeated spraying or primer. It is faster and more efficient than coating operations with the same film thickness. There is no need for static time in the coating equipment, which can save equipment space. In addition, the baking time of powder spraying is also shorter than that of liquid coating, so it can greatly reduce the consumption of fuel energy, shorten the coating operation line, and improve output and production efficiency.

[0004] Use electrostatic powder spraying equipment to spray powder coating onto the surface of the workpiece. Under the action of static electricity, the powder will be evenly adsorbed on the surface of the workpiece to form a powdery coating; the powdery coating is leveled and solidified through high-temperature baking to become the final coating with different effects.

[0005] However, the existing electrostatic powder spraying control technology has some defects, such as being unable to effectively control the fluidizing air pressure and atomizing air pressure, and the spraying effect is not ideal.

[0006] Therefore, a high-voltage electrostatic spraying control system and a control method are proposed. Summary of the invention

[0007] The purpose of the present invention is to provide a high-voltage electrostatic spraying control system and control method, to realize automatic control of four variables: electrostatic voltage, electrostatic current, flow rate pressure and atomization pressure, to provide multiple control modes, and to introduce learning control strategies into electrostatic spraying control, to realize high-quality spraying of complex workpiece surfaces, so as to solve the problems raised in the above-mentioned background technology.

[0008] To achieve the above object, the present invention provides the following technical solution: A high-voltage electrostatic spraying control system, characterized in that it includes a main control unit, a high-voltage driving unit, an external trigger signal generating unit, a spray gun interface signal processing unit and an air pressure signal processing unit;

[0009] The external trigger signal generating unit is connected to the high-voltage driving unit, and is used to generate an external trigger signal and send it to the high-voltage driving unit;

[0010] The high-voltage push unit is connected to the main control unit to perform optical coupling isolation on the external switch trigger signal and send it to the main control unit, and generate a gas circuit switch signal and a circuit switch signal according to the feedback signal of the main control unit. At the same time, the high-voltage push unit receives the PWM and DAC signals output by the main control unit to push the high-voltage package module in the spray gun to generate high-voltage static electricity.

[0011] The main control unit is used to receive the switch trigger signal processed by the high-voltage driving unit and generate a feedback signal and PWM and DAC signals according to the set parameters, and send the generated feedback signal and PWM and DAC signals to the high-voltage driving unit. At the same time, the main control unit collects the current signal amplified and conditioned by the spray gun interface signal processing unit, and uses the PID algorithm to form a closed-loop system, constant current and voltage stabilization, to ensure the stability of high-voltage electrostatics;

[0012] The spray gun interface signal processing unit is connected to the high-voltage driving unit and the main control unit to receive circuit switch signals, control voltage output, and process the current signal fed back by the high-voltage static electricity to the ground, amplify and condition it to the main control unit for collection;

[0013] The air pressure signal processing unit is connected to the high-pressure push unit and the main control unit to receive the air circuit switch signal and collect analog quantities after signal processing and feed them back to the main control unit, so that the main control unit can control the spray fluidization air pressure and atomization air pressure through algorithm calculation PI to form a closed-loop system.

[0014] Preferably, the high-voltage driving unit comprises: a first driving circuit, a second driving circuit and a trigger signal processing circuit;

[0015] The trigger signal processing circuit is connected to the first driving circuit, and is used to send the external trigger signal to the main control unit after optical coupling and receiving the feedback signal of the main control unit, and generate the gas circuit switch signal and the circuit switch signal according to the feedback signal;

[0016] The first driving circuit is connected to the second driving circuit, and is used to drive the high-voltage package module in the spray gun to generate high-voltage static electricity according to the PWM and DAC signals output by the main control unit;

[0017] The second driving circuit is connected to the trigger signal processing circuit to cooperate with the first driving circuit to drive the high-voltage package module in the spray gun.

[0018] Preferably, the first driving circuit includes a driver U3, a resistor R76, a resistor R77, a resistor R78, a resistor R79, a resistor R80, a resistor R81, a resistor R82, a resistor R83, a resistor R84, a resistor R85, a resistor R86, a diode D1, a diode D2, a diode D24, a diode Q5, a capacitor C1, a capacitor C8, a capacitor E8, an inductor L1, a MOS tube U1, a MOS tube U2, and a voltage regulator tube U4D, wherein the resistor R76, the resistor R77, the resistor R78, the resistor R79, the resistor R80, the resistor R81, the capacitor C1, The diode D24 and the inductor L1 are both connected to the driver U3, the MOS tube U1 is connected to the resistor R76, the MOS tube U2 is connected to the resistor R77, the diode D2 is connected to the MOS tube U1, the diode D1 is connected to the diode D2, the inductor L1 is connected to the resistor R82 and the capacitor E8, and the resistor R82 is connected to the resistor R83, the resistor R83 is connected to the resistor R84 and the resistor R85, and the resistor R85 is connected to the voltage regulator U4D, the voltage regulator U4D is connected to the resistor R86, and the resistor R86 is connected to the diode Q5 and the capacitor C8.

[0019] Preferably, the second driving circuit includes a driver U7, a resistor R1, a resistor R2, a resistor R3, a resistor R5, a resistor R90, a resistor R91, a resistor R94, a resistor R97, a resistor R101, a resistor R102, a resistor R103, a resistor R104, a resistor R105, a resistor R106, a diode D21, a diode D3, a diode D9, a diode Q6, a capacitor C10, a capacitor CE6, a MOS tube U9, a MOS tube U10, and a voltage regulator U4B, wherein the resistor R101, the resistor R102, the resistor R103, the resistor R104, the resistor R105, the resistor R106, the diode D2 1. The capacitor C10 and the capacitor CE6 are both connected to the driver U7, and the resistor R102 is connected to the MOS tube U9, the resistor R101 is connected to the MOS tube U10, the resistor R5 and the diode D3 are connected between the capacitor CE6 and the driver U7, the diode D9 is connected between the resistor R5 and the capacitor CE6, the capacitor CE6 is connected to the voltage regulator U4B, the resistor R1, the resistor R2, and the resistor R3 are connected in parallel between the capacitor CE6 and the voltage regulator U4B, the resistor R90, the resistor R91, the resistor R94, and the resistor R97 are all connected to the voltage regulator U4B, and the diode Q6 is connected to the voltage regulator U4B.

[0020] Preferably, the trigger signal processing circuit includes an amplifier U11, a resistor R61, a resistor R62, a resistor R63, a resistor R64, a resistor R65, a resistor R66, a resistor R67, a resistor R68, a resistor R69, a resistor R70, a resistor R71, a resistor R72, a resistor R73, a resistor R74, a resistor R75, a voltage regulator U12A, a voltage regulator U12D, a voltage regulator U12B, a voltage regulator U12C, a capacitor C15, a capacitor C16, a capacitor C17, a capacitor C21, a diode D19, a diode D20, a diode D40, and a diode Q3, wherein the resistor R74, the diode D40, and the voltage regulator U12A are respectively connected to the amplifier U11, and the resistor R75, the capacitor C15 is connected to the voltage regulator U12A, and the capacitor C15 is connected in series with the resistor R72, the resistor R73, the resistor R64, and the voltage regulator U12B. The diode D19, the diode D20, and the voltage regulator U12D are connected between the resistor R72 and the resistor R64. The resistor R69 is connected to the voltage regulator U12B. The resistor R65, the resistor R66, the resistor R70, and the resistor R71 are connected in series between the resistor R69 and the capacitor C15. The resistor R68 and the capacitor C16 are both connected to the resistor R69. The voltage regulator U12C is connected to the resistor R68. The resistor R63, the resistor R67, and the capacitor C17 are all connected to the voltage regulator U12C. The capacitor C21 and the diode Q3 are both connected to the resistor R63.

[0021] Preferably, the main control unit includes a main control chip and a sampling circuit, a crystal oscillator circuit and a memory connected thereto, and the model of the main control chip is STM32F103ZET6.

[0022] Preferably, the air pressure signal processing unit comprises a first solenoid valve control circuit, a second solenoid valve control circuit, a third solenoid valve control circuit and a fourth solenoid valve control circuit, and the four solenoid valve control circuits all comprise a control chip, and the model of the chip is L6219DS.

[0023] The high-voltage electrostatic spraying control method comprises the following steps:

[0024] An external trigger signal is generated by an external trigger signal generating unit and sent to a high voltage driving unit;

[0025] The external switch trigger signal is optically isolated and sent to the main control unit through the high-voltage push unit, and the gas circuit switch signal and circuit switch signal are generated according to the feedback signal of the main control unit. At the same time, the PWM and DAC signals output by the main control unit are received to push the high-voltage package module in the spray gun to generate high-voltage static electricity.

[0026] The spray gun interface signal processing unit receives the circuit switch signal, controls the voltage output, and processes the current signal fed back by the high-voltage static electricity to the ground, amplifies it and conditions it for collection by the main control unit;

[0027] The air circuit switch signal is received by the air pressure signal processing unit, and the analog quantity collected after signal processing is fed back to the main control unit, so that the main control unit can control the spray fluidization air pressure and atomization air pressure through algorithm calculation PI to form a closed-loop system;

[0028] The main control unit receives the switch trigger signal processed by the high-voltage push unit and generates a feedback signal as well as PWM and DAC signals according to the set parameters, and sends the generated feedback signal as well as PWM and DAC signals to the high-voltage push unit. At the same time, the main control unit collects the current signal amplified and conditioned by the spray gun interface signal processing unit, and uses the PID algorithm to form a closed-loop system, constant current and voltage regulation, to ensure the stability of high-voltage electrostatics.

[0029] Preferably, the gas circuit switch signal and the circuit switch signal are generated by a trigger signal processing circuit of the high-voltage driving unit.

[0030] Preferably, the main control unit controls the solenoid valve control circuit through algorithm calculation PI, so as to control the spray fluidization air pressure and atomization air pressure.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. Realize automatic control of four variables: electrostatic voltage, electrostatic current, flow rate pressure and atomization pressure, provide multiple control modes, and introduce learning control strategy into electrostatic spraying control to achieve high-quality spraying of complex workpiece surfaces.

[0033] 2. The performance of the equipment has been tested in various environments and is significantly better than that of traditional spraying equipment. It is highly intelligent and has no dangers. It can effectively reduce pollution, greatly save materials, and greatly reduce labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural block diagram of the present invention;

[0035] Figure 2 The main control unit circuit diagram a of the present invention;

[0036] Figure 3 The main control unit circuit diagram b of the present invention;

[0037] Figure 4 The main control unit circuit diagram c of the present invention

[0038] Figure 5 The main control unit circuit diagram d of the present invention;

[0039] Figure 6 The main control unit circuit diagram e of the present invention;

[0040] Figure 7 The circuit diagram a of the air pressure signal processing unit of the present invention;

[0041] Figure 8 The circuit diagram b of the air pressure signal processing unit of the present invention;

[0042] Fig. 9 A first driving circuit diagram of a high voltage driving unit of the present invention;

[0043] Fig.10 A second driving circuit diagram of the high voltage driving unit of the present invention;

[0044] Fig.11 A trigger signal processing circuit diagram of a high voltage driving unit of the present invention;

[0045] Fig.12 A is a circuit diagram of a human-computer interaction unit of the present invention;

[0046] Fig.13 The circuit diagram b of the human-computer interaction unit of the present invention;

[0047] Fig.14 The circuit diagram c of the human-computer interaction unit of the present invention;

[0048] Fig.15 The spray gun interface signal processing unit a of the present invention;

[0049] Fig.16 The spray gun interface signal processing unit b of the present invention;

[0050] Fig.17 The spray gun interface signal processing unit c of the present invention;

[0051] Fig.18 It is the spray gun interface signal processing unit d of the present invention. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] See also Figures 1 to 18 , the present invention provides a technical solution:

[0054] High voltage electrostatic spraying control system, such as Figure 1As shown, it includes a main control unit, a high-voltage driving unit, an external trigger signal generating unit, a spray gun interface signal processing unit and an air pressure signal processing unit, and also includes a human-computer interaction unit connected to the main control unit and a power supply circuit for supplying power to the above units.

[0055] like Figure 1 As shown, the external trigger signal generating unit is connected to the high voltage driving unit to generate an external trigger signal and send it to the high voltage driving unit.

[0056] like Figures 9 to 11 As shown, the high-voltage push unit is connected to the main control unit to optically couple and isolate the external switch trigger signal and send it to the main control unit, and generate an air circuit switch signal and a circuit switch signal according to the feedback signal of the main control unit. At the same time, the high-voltage push unit receives the PWM and DAC signals output by the main control unit, and pushes the high-voltage package module in the spray gun to generate high-voltage static electricity. The high-voltage push unit includes: a first drive circuit, a second drive circuit and a trigger signal processing circuit. The trigger signal processing circuit is connected to the first drive circuit to optically couple and clutch the external trigger signal and send it to the main control unit and receive the feedback signal of the main control unit, and generate an air circuit switch signal and a circuit switch signal according to the feedback signal. The first drive circuit is connected to the second drive circuit to push the high-voltage package module in the spray gun to generate high-voltage static electricity according to the PWM and DAC signals output by the main control unit. The second drive circuit is connected to the trigger signal processing circuit to cooperate with the first drive circuit to push the high-voltage package module in the spray gun.

[0057] like Figures 2 to 6 As shown, the main control unit is used to receive the switch trigger signal processed by the high-voltage push unit and generate feedback signals and PWM and DAC signals according to the set parameters, and send the generated feedback signals and PWM and DAC signals to the high-voltage push unit. At the same time, the main control unit collects the current signal amplified and conditioned by the spray gun interface signal processing unit, and uses the PID algorithm to form a closed-loop system, constant current and voltage stabilization, to ensure the stability of high-voltage static electricity. The main control unit includes a main control chip and a sampling circuit, crystal oscillator circuit and memory connected thereto. The model of the main control chip is STM32F103ZET6.

[0058] like Figures 15 to 18 As shown, the spray gun interface signal processing unit is connected to the high-voltage driving unit and the main control unit to receive circuit switch signals and control voltage output. At the same time, it processes the current signal fed back by the high-voltage static electricity to the ground, amplifies it and conditions it for collection by the main control unit.

[0059] like Figure 7 and Figure 8As shown, the air pressure signal processing unit is connected to the high-pressure push unit and the main control unit to receive the air circuit switch signal and collect analog quantities after signal processing and feed them back to the main control unit, so that the main control unit can control the spray fluidization air pressure and atomization air pressure through algorithm calculation PI to form a closed-loop system. The air pressure signal processing unit includes a first solenoid valve control circuit, a second solenoid valve control circuit, a third solenoid valve control circuit and a fourth solenoid valve control circuit, and the four solenoid valve control circuits all include a control chip, the model of which is L6219DS.

[0060] like Figure 12 to Figure 14 As shown, the human-machine interaction unit includes an LCD display circuit and several operation button circuits. Among them, the operation button circuit adopts optocoupler isolation technology to ensure the stability of button input and set system parameters. The LCD display circuit uses RS422 communication to communicate with the main control chip, and sends data to the LED digital tube display according to the protocol. At the same time, the LCD display circuit has multi-machine communication function, and can communicate through the RS485 interface to send data to the background monitoring platform.

[0061] The above-mentioned electrostatic spray control system realizes automatic control of four variables: electrostatic voltage, electrostatic current, flow rate pressure and atomization pressure, provides multiple control modes, and introduces learning control strategy into electrostatic spray control to achieve high-quality spraying of complex workpiece surfaces.

[0062] like Fig. 9 As shown, the first driving circuit includes a driver U3, a resistor R76, a resistor R77, a resistor R78, a resistor R79, a resistor R80, a resistor R81, a resistor R82, a resistor R83, a resistor R84, a resistor R85, a resistor R86, a diode D1, a diode D2, a diode D24, a diode Q5, a capacitor C1, a capacitor C8, a capacitor E8, an inductor L1, a MOS tube U1, a MOS tube U2, and a voltage regulator tube U4D. Among them, the resistor R76, the resistor R77, the resistor R78, the resistor R79, the resistor R80, the resistor R81, the capacitor C1, the diode D24, and the inductor L1 are all connected to the driver U3, the MOS tube U1 is connected to the resistor R76, and the MOS tube U2 is connected to the resistor R77. The diode D2 is connected to the MOS tube U1, the diode D1 is connected to the diode D2, the inductor L1 is connected to the resistor R82 and the capacitor E8, and the resistor R82 is connected to the resistor R83. The resistor R83 is connected to the resistor R84 and the resistor R85, and the resistor R85 is connected to the voltage regulator U4D, and the voltage regulator U4D is connected to the resistor R86, and the resistor R86 is connected to the diode Q5 and the capacitor C8.

[0063] like Fig.10As shown, the second driving circuit includes a driver U7, a resistor R1, a resistor R2, a resistor R3, a resistor R5, a resistor R90, a resistor R91, a resistor R94, a resistor R97, a resistor R101, a resistor R102, a resistor R103, a resistor R104, a resistor R105, a resistor R106, a diode D21, a diode D3, a diode D9, a diode Q6, a capacitor C10, a capacitor CE6, a MOS tube U9, a MOS tube U10, and a voltage regulator tube U4B. Among them, the resistor R101, the resistor R102, the resistor R103, the resistor R104, the resistor R105, the resistor R106, the diode D21, the capacitor C10, and the capacitor CE6 are all connected to the driver U7, and the resistor R102 is connected to the MOS tube U9. The resistor R101 is connected to the MOS tube U10, and the resistor R5 and the diode D3 are connected between the capacitor CE6 and the driver U7. The diode D9 is connected between the resistor R5 and the capacitor CE6, the capacitor CE6 is connected to the voltage regulator U4B, the resistors R1, R2, and R3 are connected in parallel between the capacitor CE6 and the voltage regulator U4B. The resistors R90, R91, R94, and R97 are all connected to the voltage regulator U4B, and the diode Q6 is connected to the voltage regulator U4B.

[0064] like Fig.11 As shown, the trigger signal processing circuit includes an amplifier U11, a resistor R61, a resistor R62, a resistor R63, a resistor R64, a resistor R65, a resistor R66, a resistor R67, a resistor R68, a resistor R69, a resistor R70, a resistor R71, a resistor R72, a resistor R73, a resistor R74, a resistor R75, a voltage regulator U12A, a voltage regulator U12D, a voltage regulator U12B, a voltage regulator U12C, a capacitor C15, a capacitor C16, a capacitor C17, a capacitor C21, a diode D19, a diode D20, a diode D40, and a diode Q3. Among them, the resistor R74, the diode D40, and the voltage regulator U12A are respectively connected to the amplifier U11. Resistor R75 and capacitor C15 are connected to voltage regulator U12A, and capacitor C15 is connected in series with resistor R72, resistor R73, resistor R64, and voltage regulator U12B. Diode D19, diode D20, and voltage regulator U12D are connected between resistor R72 and resistor R64. Resistor R69 is connected to voltage regulator U12B. Resistor R65, resistor R66, resistor R70, and resistor R71 are connected in series between resistor R69 and capacitor C15. Resistor R68 and capacitor C16 are both connected to resistor R69, voltage regulator U12C is connected to resistor R68, resistor R63, resistor R67, and capacitor C17 are all connected to voltage regulator U12C, and capacitor C21 and diode Q3 are both connected to resistor R63.

[0065] The present invention also discloses a high-voltage electrostatic spraying control method, which comprises the following steps:

[0066] Set parameters through the human-machine interaction unit.

[0067] An external trigger signal is generated by an external trigger signal generating unit and sent to a high voltage driving unit;

[0068] The trigger signal processing circuit uses optical coupling to isolate the external switch trigger signal and sends it to the main control unit, and generates gas circuit switch signals and circuit switch signals according to the feedback signal of the main control unit. At the same time, the first drive circuit and the second drive circuit receive the PWM and DAC signals output by the main control unit, and drive the high-voltage package module in the spray gun to generate high-voltage static electricity.

[0069] The main control unit receives the trigger signal processed by the trigger signal processing circuit and generates feedback signals, PWM and DAC signals according to the set parameters, and sends the generated feedback signals, PWM and DAC signals to the high-voltage push unit. At the same time, the main control unit collects the current signal amplified and conditioned by the spray gun interface signal processing unit, and uses the PID algorithm to form a closed-loop system, constant current and voltage stabilization, to ensure the stability of high-voltage electrostatics;

[0070] The spray gun interface signal processing unit receives the circuit switch signal, controls the voltage output, and processes the current signal fed back by the high-voltage static electricity to the ground, amplifies it and conditions it for collection by the main control unit.

[0071] The air pressure signal processing unit receives the air circuit switch signal and collects the analog quantity after signal processing and feeds it back to the main control unit. The main control unit controls the solenoid valve control circuit through algorithm calculation PI, thereby controlling the spray fluidization air pressure and atomization air pressure to form a closed-loop system.

[0072] The high-voltage electrostatic spraying control system and control method of the present invention realizes the automatic control of four variables: electrostatic voltage, electrostatic current, flow velocity pressure and atomization pressure, provides multiple control modes, and introduces learning control strategy into electrostatic spraying control to achieve high-quality spraying of complex workpiece surfaces. The performance of the test in various environments shows that it is significantly better than traditional spraying equipment. It has a high degree of intelligence and no danger; it effectively reduces pollution, greatly saves materials, and greatly reduces labor costs.

[0073] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. High voltage electrostatic spraying control system, characterized in that: It includes a main control unit, a high-pressure driving unit, an external trigger signal generating unit, a spray gun interface signal processing unit and a gas pressure signal processing unit; The external trigger signal generating unit is connected to the high-voltage driving unit, and is used to generate an external trigger signal and send it to the high-voltage driving unit; The high-voltage push unit is connected to the main control unit to perform optical coupling isolation on the external switch trigger signal and send it to the main control unit, and generate a gas circuit switch signal and a circuit switch signal according to the feedback signal of the main control unit. At the same time, the high-voltage push unit receives the PWM and DAC signals output by the main control unit to push the high-voltage package module in the spray gun to generate high-voltage static electricity. The main control unit is used to receive the switch trigger signal processed by the high-voltage driving unit and generate a feedback signal and PWM and DAC signals according to the set parameters, and send the generated feedback signal and PWM and DAC signals to the high-voltage driving unit. At the same time, the main control unit collects the current signal amplified and conditioned by the spray gun interface signal processing unit, and uses the PID algorithm to form a closed-loop system, constant current and voltage stabilization, to ensure the stability of high-voltage electrostatics; The spray gun interface signal processing unit is connected to the high-voltage driving unit and the main control unit to receive circuit switch signals, control voltage output, and process the current signal fed back by the high-voltage static electricity to the ground, amplify and condition it to the main control unit for collection; The air pressure signal processing unit is connected to the high-pressure push unit and the main control unit to receive the air circuit switch signal and collect analog quantities after signal processing and feed them back to the main control unit, so that the main control unit can control the spray fluidization air pressure and atomization air pressure through algorithm calculation PI to form a closed-loop system; The high-voltage driving unit includes: a first driving circuit, a second driving circuit and a trigger signal processing circuit; The trigger signal processing circuit is connected to the first driving circuit, and is used to send the external trigger signal to the main control unit after optical coupling and receiving the feedback signal of the main control unit, and generate the gas circuit switch signal and the circuit switch signal according to the feedback signal; The first driving circuit is connected to the second driving circuit, and is used to drive the high-voltage package module in the spray gun to generate high-voltage static electricity according to the PWM and DAC signals output by the main control unit; The second driving circuit is connected to the trigger signal processing circuit to cooperate with the first driving circuit to drive the high-voltage package module in the spray gun; The first driving circuit includes a driver U3, a resistor R76, a resistor R77, a resistor R78, a resistor R79, a resistor R80, a resistor R81, a resistor R82, a resistor R83, a resistor R84, a resistor R85, a resistor R86, a diode D1, a diode D2, a diode D24, a diode Q5, a capacitor C1, a capacitor C8, a capacitor E8, an inductor L1, a MOS tube U1, a MOS tube U2, and a voltage regulator tube U4D, wherein the resistor R76, the resistor R77, the resistor R78, the resistor R79, the resistor R80, the resistor R81, the capacitor C1, the diode D2, the diode D24, the diode Q5, the capacitor C1, the capacitor C8, the capacitor E8, the inductor L1, the MOS tube U1, the MOS tube U2, and the voltage regulator tube U4D. The tube D24 and the inductor L1 are both connected to the driver U3, the MOS tube U1 is connected to the resistor R76, the MOS tube U2 is connected to the resistor R77, the diode D2 is connected to the MOS tube U1, the diode D1 is connected to the diode D2, the inductor L1 is connected to the resistor R82 and the capacitor E8, and the resistor R82 is connected to the resistor R83, the resistor R83 is connected to the resistor R84 and the resistor R85, and the resistor R85 is connected to the voltage regulator tube U4D, the voltage regulator tube U4D is connected to the resistor R86, and the resistor R86 is connected to the diode Q5 and the capacitor C8; The second driving circuit includes a driver U7, a resistor R1, a resistor R2, a resistor R3, a resistor R5, a resistor R90, a resistor R91, a resistor R94, a resistor R97, a resistor R101, a resistor R102, a resistor R103, a resistor R104, a resistor R105, a resistor R106, a diode D21, a diode D3, a diode D9, a diode Q6, a capacitor C10, a capacitor CE6, a MOS tube U9, a MOS tube U10, and a voltage regulator tube U4B, wherein the resistor R101, the resistor R102, the resistor R103, the resistor R104, the resistor R105, the resistor R106, the diode D21, The capacitor C10 and the capacitor CE6 are both connected to the driver U7, and the resistor R102 is connected to the MOS tube U9, the resistor R101 is connected to the MOS tube U10, the resistor R5 and the diode D3 are connected between the capacitor CE6 and the driver U7, the diode D9 is connected between the resistor R5 and the capacitor CE6, the capacitor CE6 is connected to the voltage regulator tube U4B, the resistor R1, the resistor R2, and the resistor R3 are connected in parallel between the capacitor CE6 and the voltage regulator tube U4B, the resistor R90, the resistor R91, the resistor R94, and the resistor R97 are all connected to the voltage regulator tube U4B, and the diode Q6 is connected to the voltage regulator tube U4B; The trigger signal processing circuit includes an amplifier U11, a resistor R61, a resistor R62, a resistor R63, a resistor R64, a resistor R65, a resistor R66, a resistor R67, a resistor R68, a resistor R69, a resistor R70, a resistor R71, a resistor R72, a resistor R73, a resistor R74, a resistor R75, a voltage regulator U12A, a voltage regulator U12D, a voltage regulator U12B, a voltage regulator U12C, a capacitor C15, a capacitor C16, a capacitor C17, a capacitor C21, a diode D19, a diode D20, a diode D40, and a diode Q3, wherein the resistor R74, the diode D40, and the voltage regulator U12A are respectively connected to the amplifier U11, and the resistor R75, the capacitor C16, the capacitor C17, the capacitor C21, the diode D19, the diode D20, the diode D40, and the diode Q3. 5 is connected to the voltage regulator U12A, and the capacitor C15 is connected in series with the resistor R72, the resistor R73, the resistor R64, and the voltage regulator U12B, the diode D19, the diode D20, and the voltage regulator U12D are connected between the resistor R72 and the resistor R64, the resistor R69 is connected to the voltage regulator U12B, the resistor R65, the resistor R66, the resistor R70, and the resistor R71 are connected in series between the resistor R69 and the capacitor C15, the resistor R68 and the capacitor C16 are both connected to the resistor R69, the voltage regulator U12C is connected to the resistor R68, the resistor R63, the resistor R67, and the capacitor C17 are all connected to the voltage regulator U12C, and the capacitor C21 and the diode Q3 are both connected to the resistor R63.

2. The high voltage electrostatic spraying control system according to claim 1 is characterized in that: The main control unit includes a main control chip and a sampling circuit, a crystal oscillator circuit and a memory connected thereto. The model of the main control chip is STM32F103ZET6.

3. The high voltage electrostatic spraying control system according to claim 1 is characterized in that: The air pressure signal processing unit includes a first solenoid valve control circuit, a second solenoid valve control circuit, a third solenoid valve control circuit and a fourth solenoid valve control circuit. The four solenoid valve control circuits all include a control chip, and the model of the chip is L6219DS.

4. A control method for a high-voltage electrostatic spraying control system as claimed in claim 1, characterized in that: The following steps are involved: An external trigger signal is generated by an external trigger signal generating unit and sent to a high voltage driving unit; The external switch trigger signal is optically isolated and sent to the main control unit through the high-voltage push unit, and the gas circuit switch signal and circuit switch signal are generated according to the feedback signal of the main control unit. At the same time, the PWM and DAC signals output by the main control unit are received to push the high-voltage package module in the spray gun to generate high-voltage static electricity. The spray gun interface signal processing unit receives the circuit switch signal, controls the voltage output, and processes the current signal fed back by the high-voltage static electricity to the ground, amplifies it and conditions it for collection by the main control unit; The air pressure signal processing unit receives the air circuit switch signal and collects the analog quantity after signal processing and feeds it back to the main control unit, so that the main control unit can control the spray fluidization air pressure and atomization air pressure through algorithm calculation PI to form a closed-loop system; The main control unit receives the switch trigger signal processed by the high-voltage push unit and generates a feedback signal as well as PWM and DAC signals according to the set parameters, and sends the generated feedback signal as well as PWM and DAC signals to the high-voltage push unit. At the same time, the main control unit collects the current signal amplified and conditioned by the spray gun interface signal processing unit, and uses the PID algorithm to form a closed-loop system, constant current and voltage regulation, to ensure the stability of high-voltage electrostatics.

5. The high voltage electrostatic spraying control method according to claim 4, characterized in that: The gas circuit switch signal and the circuit switch signal are generated by a trigger signal processing circuit of the high-voltage driving unit.

6. The high voltage electrostatic spraying control method according to claim 4, characterized in that: The main control unit controls the electromagnetic valve control circuit through algorithm calculation PI, so as to control the spray fluidization air pressure and atomization air pressure.

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