CN205199771U - Static powder spraying controller - Google Patents
Static powder spraying controller Download PDFInfo
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- CN205199771U CN205199771U CN201521016150.8U CN201521016150U CN205199771U CN 205199771 U CN205199771 U CN 205199771U CN 201521016150 U CN201521016150 U CN 201521016150U CN 205199771 U CN205199771 U CN 205199771U
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Abstract
The utility model discloses a static powder spraying controller, including master control MCU circuit to and the man -machine interface circuit, triggering signal treatment circuit, spray gun interface signals treatment circuit and the pressure signal treatment circuit that link to each other with master control MCU circuit respectively, still include the switching power supply for the power supply of above -mentioned circuit. The utility model discloses a controller can be realized multiple mode, electric parameter and pneumatic parameter automatic control and increase study control strategy on PI control is basic.
Description
Technical field
The utility model relates to electrostatic powder coating field, particularly a kind of electrostatic powder coating controller.
Background technology
Electrostatic powder coating utilizes the active force of electrostatic field to charged particle to make charged coating powder firmly be adsorbed on processed surface of the work, and powder bed, after high-temperature baking, fusing, levelling and low-temperature setting, forms solid coating at surface of the work.Electrostatic powder coating controller has been the key equipment of electrostatic powder coating, existing controller often only achieves automatic control to electrostatic potential and electrostatic induced current, do not implement automatically to control to flow velocity air pressure and atomization air pressure, many states outer controller also only has the manual adjustments function of atomization air pressure and flow velocity air pressure, makes to require very high to the stable gas pressure of source of the gas in electrostatic spray process; The control model that existing controller is supported often also only has electrostatic potential pattern and electrostatic induced current pattern, is difficult to meet high-quality spraying requirement; In addition, when the real time execution of control model, the control strategy of employing is mainly PI control strategy, lacks the Advanced Control Strategies of applicable complex part curved surface.The utility model realize electrostatic potential, electrostatic induced current, flow velocity air pressure and atomization air pressure four variablees automatic control, various control pattern is provided, and Learning control strategy introduce electrostatic spraying control in, realize spraying the high-quality of complex part curved surface.
Utility model content
The purpose of this utility model is that the shortcoming overcoming prior art is with not enough, provides a kind of electrostatic powder coating controller.
The purpose of this utility model is realized by following technical scheme:
A kind of electrostatic powder coating controller, comprise main control MCU circuit, and the man-machine interface circuit, triggering signal treatment circuit, spray gun interface signal treatment circuit and the air pressure signal processing circuit that are connected with main control MCU circuit respectively, also comprise the Switching Power Supply of powering for foregoing circuit.
Described man-machine interface circuit comprises three end LDO voltage stabilizer SPX1117, LED, charactron LED driver, key-press input scanning circuit; Wherein+5V is reduced to the MCU working power of+3.3V as man-machine interface circuit by three end LDO voltage stabilizer SPX1117; Charactron LED driver, key-press input scanning circuit adopt 2 BC7277, BC7277 to be communicated with the MCU of man-machine interface by SPI interface; The MCU of man-machine interface adopts USART1 interface and RS422 driver SP3490 and main control MCU circuit communication, and employing USART3 interface is connected with outside RS485 bus with RS485 driver SP485, realizes multiple stage electrostatic powder coating controller networking.
The MCU of described main control MCU circuit adopts STM32F205VC.
The MCU of described man-machine interface circuit adopts STM32F100C8.
Described main control MCU circuit is communicated by RS422 interface (through SP3490 driving chip) with man-machine interface circuit.
A kind of electrostatic powder coating control method, comprises the following steps:
Main control MCU circuit is connected with triggering signal treatment circuit by I/O interface, receives outer triggering signal, and the duty in conjunction with electrostatic controller exports and triggers permissive signal; The voltage, electric current and the electric output state feedback signal that export is obtained by spray gun interface signal treatment circuit, in conjunction with mode of operation and the duty output control voltage of electrostatic controller, the electrostatic potential of regulation output or electrostatic induced current; Obtain flow velocity air pressure and atomization air pressure feedback signal by air pressure signal treatment circuit, in conjunction with mode of operation and the duty output step motor control signal of electrostatic controller, regulate flow velocity air pressure and atomization air pressure output valve;
Triggering signal treatment circuit receives outer triggering signal and becomes the trigger input signal of main control MCU circuit after changing its logic level; Determine that the logic exporting air circuit breaker signal and contactor signal is high and low according to outer triggering signal and the logical AND result triggering permissive signal, realize the Kai Heguan of gas circuit and circuit output;
Air pressure signal treatment circuit becomes required flow velocity air pressure and atomization air pressure pressure according to the adjusting position of baroswitch signal and stepper motor air input pressure, output pressure measured value is exported to main control MCU circuit simultaneously, the digital control of air pressure is realized at main control MCU inside circuit, the external spray gun of spray gun interface signal treatment circuit, the 24V voltage that Switching Power Supply provides is become the control voltage needed for external spray gun, receive the current feedback input value of spray gun, simultaneously output voltage, electric current and state are (normally, overload and short circuit) be transferred to main control MCU circuit, the various control models of electrostatic spraying controller are realized together with main control MCU circuit.
The control model of described electrostatic powder coating control method is electrostatic mode of operation, and electrostatic mode of operation comprises conventional constant voltage mode and constant current mode, also comprises invariable power pattern and constant current density pattern; Wherein invariable power pattern is that the product of electrostatic output voltage and electric current is constant, constant current density pattern is on constant current mode basis, change according to output pressure is finely tuned output current, makes the amount of powder of charge number and the output exported be approximated to direct ratio, realizes uniform current density.
Described electrostatic powder coating control method is a repetition Workpiece painting process for automatically electrostatic spray process, introduces iterative learning control thought, when each Electrostatic Control voltage exports, exports for the control voltage revising this according to previous departure.Improve and there is complex curved surface part electrostatic powder coating control accuracy.
Compared with prior art, tool has the following advantages and beneficial effect the utility model:
(1) except voltage and current output control automatically, also there is flow velocity air pressure and atomization air pressure controls automatically, reduce the requirement of input source of the gas pressure stability.
(2) have RS485 communication external interface, electrostatic spraying controller both can form separate unit manual powder spraying system with electrostatic gun, also can become have by RS485 networking the large automatic paint finishing of many spray guns.
(3) there are constant voltage mode, constant current mode, invariable power pattern and constant current density pattern totally four kinds of electrostatic spraying mode of operations, adapt to higher spraying coating process requirement.
(4) introduce iterative learning controlling mechanism, than common PI control algolithm, there is higher control accuracy, improve coating quality.
Accompanying drawing explanation
Fig. 1 is electrostatic spraying controller architecture block diagram.
Fig. 2 is electrostatic spraying controller man-machine interface.
Fig. 3 is electrostatic spraying controller air pressure control principle drawing.
Fig. 4 is constant voltage mode control loop.
Fig. 5 is constant current mode control loop.
Fig. 6 is invariable power mode control loop.
Fig. 7 is permanent density mode schematic diagram.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but embodiment of the present utility model is not limited thereto.
With reference to figure 1, electrostatic powder coating controller is by Switching Power Supply, man-machine interface circuit, main control MCU circuit, triggering signal treatment circuit, and air pressure signal treatment circuit and spray gun interface signal treatment circuit form.
Switching Power Supply adopts bright latitude Switching Power Supply NED-100D, alternating current 220V AC is become direct current 24V and 5V, wherein 24V powers to the switch electromagnetic valve of the electric output circuit of spray gun interface signal treatment circuit and air pressure signal processing circuit and stepper motor, and other circuit adopts 5V to power.This electrostatic powder coating controller adopts dual-MCU configuration, except main control MCU circuit contains except MCU, man-machine interface circuit is also containing MCU, main control MCU selects STM32F205VC, man-machine interface MCU selects STM32F100C8, and both are by RS422 interface (through SP3490 driving chip) communication.Main control MCU circuit is connected with triggering signal treatment circuit by I/O interface, receives outer triggering signal, and the duty (stop or running) in conjunction with electrostatic controller exports and triggers permissive signal; The voltage, electric current and the electric output state feedback signal that export is obtained by spray gun interface signal treatment circuit, in conjunction with mode of operation and the duty output control voltage of electrostatic controller, the electrostatic potential of regulation output or electrostatic induced current; Obtain flow velocity air pressure and atomization air pressure feedback signal by air pressure signal treatment circuit, in conjunction with mode of operation and the duty output step motor control signal of electrostatic controller, regulate flow velocity air pressure and atomization air pressure output valve.Triggering signal treatment circuit receives outer triggering signal and becomes the trigger input signal of main control MCU circuit after changing its logic level; Determine that the logic exporting air circuit breaker signal and contactor signal is high and low according to outer triggering signal and the logical AND result triggering permissive signal, realize the Kai Heguan of gas circuit and circuit output.Air pressure signal treatment circuit becomes required flow velocity air pressure and atomization air pressure pressure according to the adjusting position of baroswitch signal and stepper motor certain air input pressure, output pressure measured value is exported to main control MCU circuit simultaneously, realize the digital control of air pressure at main control MCU inside circuit.The external spray gun of spraying interface signal treatment circuit, the 24V voltage that Switching Power Supply provides is become the control voltage needed for external spray gun, receive the current feedback input value of spray gun, output voltage, electric current and state (normally, transshipping and short circuit) are transferred to main control MCU circuit simultaneously, realize the various control models of electrostatic spraying controller together with main control MCU circuit.
Man-machine interface circuit adopts three end LDO voltage stabilizer SPX1117+5V to be reduced to the working power of+3.3V as MCU.LED and charactron LED driver and key-press input scanning circuit adopt 2 BC7277, BC7277 to be communicated with MCU by SPI interface.Man-machine interface MCU adopts USART1 interface to communicate with main MCU with RS422 driver SP3490; Adopt USART3 interface to be connected with outside RS485 bus with RS485 driver SP485, realize multiple stage electrostatic powder coating controller networking.With reference to figure 2, man-machine interface is made up of 4 LED lights, 11 Digital sum pipe, 12 Digital sum pipe, 43 Digital sum pipes and 12 buttons.4 LED lights show " presetting ", " RUN ", " triggering " and " communication " duty respectively, wherein " preset " that LED is bright refers to that man-machine interface is in human configuration running parameter state; " RUN " LED is bright refers to that electrostatic powder coating controller runs, otherwise stops waiting for; " triggering " LED is bright refers to that spray controller accepts extraneous triggering signal and exporting to trigger to export electrically and air pressure signal; " communication " LED equivalent refer to spray painting control with outside RS485 bus communication.The electrostatic mode of operation of 1 Digital sum pipe instruction spray controller, can be constant voltage mode, constant current mode, invariable power pattern and constant current density pattern.Which group running parameter 2 Digital sum pipes show, spray controller can store from 00 ~ 99 totally 100 groups of running parameters, wherein 00 ~ 09 group of parameter is for being solidificated in spray controller inside, can not revise, recall use only, the conventional spraying process technological parameter of great majority at present can be applicable to, facilitate user directly to recall use, do not need to configure one by one each parameter, other parameter group is configured voluntarily by user.43 Digital sum pipes realize electrostatic potential, electrostatic induced current, flow velocity air pressure and atomization air pressure numerical value respectively.12 buttons have " parameter group ", " voltage ", " electric current ", " electrostatic mode " and " flow velocity air pressure " totally 6 option and installment type buttons respectively, " startup " and " stopping " 2 spray controllers are started working and quit work button, " presetting ", " increase ", " minimizing " and " confirmation " 4 parameter modification operating knobs.Running parameter layoutprocedure is as follows, first " presetting " button, and " presetting " LED is bright, enters the configurable state of parameter, if press without key for 15 seconds, then " presets " LED and goes out, be retracted into the configurable state of parameter; When " presetting " LED is bright, by " parameter group " button, 2 " parameter group " charactron flickers, the parameter group that will work is selected by " minimizing " and " increase " button, in the process of amendment parameter group code name, other numeral method preserves the relevant parameter in this parameter group, by " confirmation " button, current parameter group code name is set to current operating parameters group.When needing to revise the parameter in current operating parameters group, in the configurable state of parameter, after Selection parameter group code, the parameter button revised on demand, as need voltage parameter be revised, then by " voltage " button, then corresponding parameter display charactron flicker, by revising parameter value by " increase " and " minimizing " button, last " confirmation " button completes parameter modification.
Electrostatic spraying controller not only achieves the automatic control of output voltage and electric current, also achieves the automatic control of air pressure signal.With reference to figure 3, flow velocity air pressure is identical with the close loop control circuit structure of atomization air pressure, in pressure sensing amplifying circuit 1 and pressure sensing amplifying circuit 2, sensor adopts MPS20N1000D-S, amplifier to adopt LM324, and air pressure feedback signal connects the ADC of main control singlechip STM32F205VC; Actuator adopts pressure-reducing valve and stepper motor, and stepper motor driver chip adopts A4985SLPTR-T, main control singlechip STM32F205VC to connect motor drive ic by I/O and realizes the adjustment of pressure-reducing valve aperture, thus makes output pressure value near setting value.The input adopting switch electromagnetic valve to control source of the gas can realize fast shut-off and the unlatching of output pressure, reduces pressure-reducing valve frequent movement simultaneously, extends pressure-reducing valve working life.
Electrostatic spraying controller can select constant voltage mode, constant current mode, constant power pattern and isodensity pattern four kinds of mode of operations, shows current operation mode by one digit number code pipe.Constant voltage mode is realized by voltage control loop, and with reference to figure 4, voltage control loop circuit exports the Vout that the input voltage of 24V becomes variable values.T401 and T403 forms Darlington power Correctional tube, and T401 selects high-power PNP transistor TIP147, T403 to select NPN transistor MMBT4401.A401 is error amplifier, selects track to track amplifier OPA4188, and it exports the base stage being driven T403 by resistance R403 (3k Ω).Usv is the setting value of voltage control loop, and exported by the DAC of main MCU, its work excursion is 0.85V ~ 3.0V, and corresponding output voltage is about 5.95V ~ 21V, when Usv is 0V, closes and exports.Upv is output voltage measured value, and measured by resistance R404 (3k Ω), resistance R405 (3k Ω) and resistance R406 (resistance is 1k Ω) dividing potential drop of connecting, intrinsic standoff ratio is 1:7.The colelctor electrode current-limiting resistance that resistance R402 (100 Ω) is T403 (PNP transistor MMBT4403); The overcurrent protection resistance that resistance R401 (0.5 Ω) is T401, when the electric current flowing through T401 is greater than 1.4A, T402 starts conducting, improves T401 base voltage, thus the continuation of restricted T 401 collector current increases.
Constant current mode, constant power pattern and isodensity pattern are realized by main MCU internal firmware and Fig. 4 voltage control loop and peripheral circuit.Fig. 5 is constant current mode control loop, and the voltage of linear voltage decreasing voltage control loop exports to spray gun; The spraying current that spray gun and workpiece form spraying process can feed back to spraying current translation circuit by spray gun interface, and spraying current translation circuit connects the ADC of main control MCU circuit; Main control MCU circuit is according to the difference of spraying current setting value Isv and spraying current measured value Ipv, by spraying current controller output voltage setting value Usv, thus perform adjustment process by linear voltage decreasing voltage control loop, realize constant current controlling pattern, spraying current translation circuit adopts firmware to realize in MCU inside.The current-mode that general electrostatic powder coating controls adopts PI control algolithm, the utility model adds learning functionality, have employed Iterative Learning Control Algorithm, to adapt to the fast spraying of complex part, improve coating quality, Iterative Learning Control Algorithm is such as formula shown in (1).
In order to ensure that voltage setting value requires working range at spray gun, have employed amplitude limit and exporting, shown in (2), obtaining final desired voltage setting value.
In formula (1), k is processing number of times (number relative to workpiece to be machined), and k initial value is 0, the initial value of voltage setting value Usv is 0, sprays operation later at every turn, extracts experience from from k-1 time, revise the voltage setting value Usv of k time, thus improve control accuracy, β
1for current feedback gain, be taken as 35; In formula (2), [U
sVMIN, U
sVMAX] be voltage setting value working range [0.85V, 3.0V].
The control loop of constant power pattern is similar to constant current mode control loop, as shown in Figure 6, have employed power controller and instead of current controller, and add power calculator (being multiplier), other is the same with constant current mode.The Iterative Learning Control Algorithm of constant power pattern is such as formula shown in (3).
In formula (3), W
efor power error, sgn, sqr and abs be sign function, evolution function and ABS function respectively, β
2for Feedback of Power gain, get 5.9, its physical significance is consistent with formula (1), and similarly also need could as the setting value of voltage control loop after the slicing algorithm of formula (2) for voltage setting value.
In electrostatic spray process, air pressure change will cause powder density to change, and isodensity pattern is the setting value regulating current control loop according to the change of air pressure, reduce powder particle with the change of electric charge average, improve coating quality.With reference to figure 7, isodensity pattern realizes according to air pressure change correcting current setting value on constant current mode basis; First subtracter asks the difference of flow velocity air pressure PF setting value and measured value, and the second subtracter asks the difference of atomization air pressure PA setting value and measured value; Permanent density conpensation obtains the setting value of IMsv as electrostatic induced current control loop according to flow velocity draught head and atomization gas pressure reduction correcting current setting value Isv; Permanent density conpensation backoff algorithm is such as formula shown in (4).
IM
SV＝I
SV+α
1·(PF
SV-PF
PV)+α
2·(PA
SV-PA
PV)(4)。
α in formula (4)
1and α
2for correction factor, value is respectively 0.05 and 0.01, or passes through test determination.Although the utility model have employed air pressure Automatic Control Strategy, the average undulating value of air pressure is little, but because the air pressure adjustment time (passing through stepper motor) is longer, there is transient swing phenomenon, through type (4) can overcome transient state air pressure fluctuation to be affected coating quality, thus improves coating quality further.
Above-described embodiment is the utility model preferably embodiment; but embodiment of the present utility model is not restricted to the described embodiments; change, the modification done under other any does not deviate from Spirit Essence of the present utility model and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection domain of the present utility model.
Claims (5)
1. an electrostatic powder coating controller, it is characterized in that: comprise main control MCU circuit, and the man-machine interface circuit, triggering signal treatment circuit, spray gun interface signal treatment circuit and the air pressure signal processing circuit that are connected with main control MCU circuit respectively, also comprise the Switching Power Supply of powering for foregoing circuit.
2. electrostatic powder coating controller according to claim 1, is characterized in that: described man-machine interface circuit comprises three end LDO voltage stabilizer SPX1117, LED, charactron LED driver, key-press input scanning circuit; Wherein+5V is reduced to the MCU working power of+3.3V as man-machine interface circuit by three end LDO voltage stabilizer SPX1117; Charactron LED driver, key-press input scanning circuit adopt 2 BC7277, BC7277 to be communicated with the MCU of man-machine interface by SPI interface; The MCU of man-machine interface adopts USART1 interface and RS422 driver SP3490 and main control MCU circuit communication, and employing USART3 interface is connected with outside RS485 bus with RS485 driver SP485, realizes multiple stage electrostatic powder coating controller networking.
3. electrostatic powder coating controller according to claim 1, is characterized in that: the MCU of described main control MCU circuit adopts STM32F205VC.
4. electrostatic powder coating controller according to claim 1, is characterized in that: the MCU of described man-machine interface circuit adopts STM32F100C8.
5. electrostatic powder coating controller according to claim 1, is characterized in that: described main control MCU circuit and man-machine interface circuit are by RS422 interface communication.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521016150.8U CN205199771U (en) | 2015-12-09 | 2015-12-09 | Static powder spraying controller |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521016150.8U CN205199771U (en) | 2015-12-09 | 2015-12-09 | Static powder spraying controller |
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| CN205199771U true CN205199771U (en) | 2016-05-04 |
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|---|---|---|---|
| CN201521016150.8U Withdrawn - After Issue CN205199771U (en) | 2015-12-09 | 2015-12-09 | Static powder spraying controller |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105413902A (en) * | 2015-12-09 | 2016-03-23 | 华南理工大学 | Electrostatic powder spraying controller and control method |
| CN107367962A (en) * | 2017-06-28 | 2017-11-21 | 安徽信陆电子科技有限公司 | A kind of spraying equipment automatic control system |
| CN112474150A (en) * | 2020-11-13 | 2021-03-12 | 北京市劳动保护科学研究所 | Dust removal system and method for powder coating |
-
2015
- 2015-12-09 CN CN201521016150.8U patent/CN205199771U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105413902A (en) * | 2015-12-09 | 2016-03-23 | 华南理工大学 | Electrostatic powder spraying controller and control method |
| CN105413902B (en) * | 2015-12-09 | 2018-02-27 | 华南理工大学 | A kind of electrostatic powder coating controller and control method |
| CN107367962A (en) * | 2017-06-28 | 2017-11-21 | 安徽信陆电子科技有限公司 | A kind of spraying equipment automatic control system |
| CN112474150A (en) * | 2020-11-13 | 2021-03-12 | 北京市劳动保护科学研究所 | Dust removal system and method for powder coating |
| CN112474150B (en) * | 2020-11-13 | 2022-06-17 | 北京市劳动保护科学研究所 | Dust removal system and method for powder coating |
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Granted publication date: 20160504 Effective date of abandoning: 20180227 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20160504 Effective date of abandoning: 20180227 |
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| AV01 | Patent right actively abandoned |