CN105446222A - Signal conditioning device of electric smelting magnesia furnace embedded controller - Google Patents
Signal conditioning device of electric smelting magnesia furnace embedded controller Download PDFInfo
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- CN105446222A CN105446222A CN201510964713.4A CN201510964713A CN105446222A CN 105446222 A CN105446222 A CN 105446222A CN 201510964713 A CN201510964713 A CN 201510964713A CN 105446222 A CN105446222 A CN 105446222A
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- electric melting
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/21—Pc I-O input output
- G05B2219/21126—Signal processing, filter input
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- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention discloses a signal conditioning device of an electric smelting magnesia furnace embedded controller, and belongs to the electric smelting magnesia furnace process control technology field. The signal conditioning device comprises a plurality of analog input signal isolation and conversion modules, a plurality of analog output signal isolation and conversion modules, a plurality of digital input signal isolation and conversion modules, and a plurality of digital output signal isolation and conversion modules, which are integrated on the same circuit board, and are disposed between the corresponding sensors and the corresponding execution mechanisms of the electric smelting magnesia furnace embedded controller and the electric smelting magnesia furnace embedded control system. The signal conditioning device is advantageous in that the normal use of the electric smelting magnesia furnace embedded controller can be guaranteed, and the interferences of the peak signals on the electric smelting magnesia furnace embedded controller can be effectively reduced; and the damage risk of the electric smelting magnesia furnace embedded controller can be reduced, and the safety and the control precision of the whole electric smelting magnesia furnace embedded control system can be directly improved.
Description
Technical field
The invention belongs to electric melting magnesium furnace process control technology field, be specifically related to a kind of signal regulating device of electric melting magnesium furnace embedded controller.
Background technology
The production run of fused magnesite take giobertite as raw material, three-phase alternating current electric smelting magnesium stove is adopted to carry out melting, three-phase electrode electric current is controlled by the position between adjustment three-phase electrode and bath surface, make it to produce electric arc, make raw material melted by heat in stove form liquation by electric arc heat release, liquation generates finished product again after crystallisation by cooling.
Along with the raising that fused magnesite enterprise requires efficiency of energy utilization and product grade, the control mode of smelting process starts to turn to by control mode manually the automatic control mode adopting Intelligent Control Strategy gradually, and the automaton adopted also presents the trend changed to more intelligent embedded control system (as shown in Figure 1) by PLC control system.Embedded controller is a Complex Electronic Systems Based containing multiple electronic devices and components and electronic unit, mutual interference between the interference of external signal and internal system device, between each Transfer pipe all can produce interference to embedded controller and data message thereof and destroy, and affects the job stability of embedded controller, reliability and security.Such as, in fused magnesite smelting process, electric melting magnesium furnace embedded controller is in a very complicated electromagnetic environment, the dynamic perfromance of the equipment work such as power switch, frequency converter, dragging motor and smelting process itself all easily produces spiking to the impact of smelting electric current, and then impacts embedded controller.In addition, the analog quantity that embedded controller can accept and export or digital quantity signal often with the external unit of industry spot, the signal that can provide as sensor or topworks or accept there are differences in type and interval, needs to carry out corresponding signal conversion.Therefore; design and develop a kind of electric melting magnesium furnace embedded controller signal conditioning circuit plate; for the protection of the special embedded controller of electric melting magnesium furnace; reduce in smelting process the spiking that produces to the impact of electric melting magnesium furnace embedded controller, and to carry out necessary conversion to the input/output signal of embedded controller be very necessary.
Summary of the invention
Smelt environment for fused magnesite and there is complicated electromagnetic interference (EMI); the safe and stable operation of embedded controller is threatened; the inconsistent problem of signal type and interval in whole control system; the invention provides a kind of signal regulating device of electric melting magnesium furnace embedded controller; the input and output signal of embedded controller is changed and isolates; electric melting magnesium furnace embedded controller is normally worked; and effectively filter out spiking, electric melting magnesium furnace embedded controller is played a protective role.
Technical scheme of the present invention:
A signal regulating device for electric melting magnesium furnace embedded controller, comprising: be integrated in the isolation of several analog input signals on same circuit board and modular converter, the isolation of several analog quantity output signals and modular converter, the isolation of several digital quantity input signals and modular converter, the isolation of several digital output signals and modular converter; The described isolation of analog input signal is connected with the output terminal of respective sensor in the embedded control system of electric melting magnesium furnace with the input end of modular converter, and the isolation of the analog input signal input end corresponding with described electric melting magnesium furnace embedded controller to the output terminal of modular converter is connected; The isolation of the described analog quantity output signals output terminal corresponding with described electric melting magnesium furnace embedded controller to the input end of modular converter is connected, and the input end of the topworks that the isolation of analog quantity output signals is corresponding with electric melting magnesium furnace embedded control system to the output terminal of modular converter is connected; The described isolation of digital quantity input signal is connected with the output terminal of respective sensor in described electric melting magnesium furnace embedded control system with the input end of modular converter, and the isolation of the digital quantity input signal input end corresponding with described electric melting magnesium furnace embedded controller to the output terminal of modular converter is connected; The described isolation of digital output signal is connected with the output terminal of the input end of modular converter with described electric melting magnesium furnace embedded controller, and the input end of the topworks that the isolation of digital output signal is corresponding with electric melting magnesium furnace embedded control system to the output terminal of modular converter is connected.
According to the signal regulating device of described electric melting magnesium furnace embedded controller, the quantity of the corresponding sensor that the isolation of described analog input signal and the isolation of modular converter, analog quantity output signals and the isolation of modular converter, digital quantity input signal and the isolation of modular converter, digital output signal and modular converter quantity are separately connected separately by it or topworks determines.
According to the signal regulating device of described electric melting magnesium furnace embedded controller, the isolation of described analog input signal and modular converter, master die analog quantity input signal for the 4-20mA provided by sensor in the embedded control system of molten magnesium stove converts the embedded controller acceptable analog input signal of 0-5V to, isolates these two kinds of signals simultaneously.
According to the signal regulating device of described electric melting magnesium furnace embedded controller, the isolation of analog quantity output signals and modular converter, for the analog quantity output signals of electric melting magnesium furnace embedded controller being converted to the master die analog quantity signal needed for the corresponding topworks of electric melting magnesium furnace embedded control system, these two kinds of signals are isolated simultaneously.
According to the signal regulating device of described electric melting magnesium furnace embedded controller, the isolation of digital quantity input signal and modular converter: the 24V on-off model for being provided by sensor in the embedded control system of molten magnesium stove converts embedded controller acceptable 5V on-off model to, isolate these two kinds of signals simultaneously.
The signal regulating device of electric melting magnesium furnace embedded controller according to claim 1, the isolation of digital output signal and modular converter: the 5V on-off model for being exported by embedded controller converts the 24V on-off model needed for the corresponding topworks in electric melting magnesium furnace embedded control system to, isolate these two kinds of signals simultaneously.
According to the signal regulating device of described electric melting magnesium furnace embedded controller, the isolation of described analog input signal and modular converter are made up of the analog input isolating chip of model to be the analog input signal conversion chip of RCV420 and model be ISO122.
According to the signal regulating device of described electric melting magnesium furnace embedded controller, what the isolation of described analog quantity output signals and modular converter adopted is model is the amplifier chip of OP07.
According to the signal regulating device of described electric melting magnesium furnace embedded controller, what the isolation of described digital quantity input signal and modular converter adopted is model is the 4 passage opto-coupler chips of TLP281-4.
According to the signal regulating device of described electric melting magnesium furnace embedded controller, what the isolation of described digital output signal and modular converter adopted is model is the driving chip of ULN2003D.
Beneficial effect: the signal regulating device that the invention provides a kind of electric melting magnesium furnace embedded controller, can realize the isolation to electric melting magnesium furnace embedded controller input/output signal and conversion.Present invention ensures that the normal use of electric melting magnesium furnace embedded controller, effectively decrease the interference of spiking to electric melting magnesium furnace embedded controller, reduce the damaged risk of electric melting magnesium furnace embedded controller, these will directly improve security and the control accuracy of whole electric melting magnesium furnace embedded control system.
Accompanying drawing explanation
Electric melting magnesium furnace embedded control system schematic diagram in Fig. 1 one embodiment of the present invention;
Fig. 2 is the structural representation of the signal regulating device of electric melting magnesium furnace embedded controller in one embodiment of the present invention;
Fig. 3 is the circuit catenation principle figure of model to be the analog input signal conversion chip of RCV420 and model the be analog input isolating chip of ISO122 in one embodiment of the present invention;
Fig. 4 is that in one embodiment of the present invention, model is the circuit catenation principle figure of the amplifier chip of OP07;
Fig. 5 is that in one embodiment of the present invention, model is the circuit catenation principle figure of the 4 passage opto-coupler chips of TLP281-4;
Fig. 6 is that in one embodiment of the present invention, model is the driving chip circuit catenation principle figure of ULN2003D.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
The signal regulating device of the electric melting magnesium furnace embedded controller of present embodiment, as shown in Figure 2, comprising: be integrated in the isolation of several analog input signals on same circuit board and modular converter, the isolation of several analog quantity output signals and modular converter, the isolation of several digital quantity input signals and modular converter, the isolation of several digital output signals and modular converter; The described isolation of analog input signal is connected with the output terminal of respective sensor in electric melting magnesium furnace embedded control system with the input end of modular converter, and the isolation of the analog input signal input end corresponding with described embedded controller to the output terminal of modular converter is connected; The isolation of the described analog quantity output signals output terminal corresponding with described embedded controller to the input end of modular converter is connected, and the isolation of analog quantity output signals is connected to the input end of the output terminal of modular converter with corresponding topworks's (such as frequency converter) of electric melting magnesium furnace embedded control system; The output terminal of the sensor that the described isolation of digital quantity input signal is corresponding with described molten magnesium stove embedded control system to the input end of modular converter is connected, and the isolation of the digital quantity input signal input end corresponding with described embedded controller to the output terminal of modular converter is connected; The described isolation of the digital output signal output terminal corresponding with described embedded controller to the input end of modular converter is connected, and the input end of topworks's (such as relay, contactor) that the isolation of digital output signal is corresponding with electric melting magnesium furnace embedded control system to the output terminal of modular converter is connected.Described analog signals and digital quantity signal input and output direction are for electric melting magnesium furnace embedded controller, namely the analog signals and the digital quantity signal that are input to electric melting magnesium furnace embedded controller are called analog input signal and digital quantity input signal, and the analog signals that electric melting magnesium furnace embedded controller exports and digital quantity signal are called analog quantity output signals and digital output signal.
The analog input provided due to sensor in electric melting magnesium furnace embedded control system is the master die analog quantity signal of 4-20mA, embedded controller acceptable analog input signal is the voltage signal of 0-5V, therefore needs the voltage signal master die analog quantity signal of 4-20mA being converted to 0-5V.The master die analog quantity input signal of the 4-20mA provided by sensor in the embedded control system of electric melting magnesium furnace by the isolation of analog input signal and modular converter in present embodiment converts the embedded controller acceptable analog input voltage signal of 0-5V to, isolates these two kinds of signals simultaneously.The isolation of the analog input signal of present embodiment and modular converter are made up of the analog input isolating chip of model to be the analog input signal conversion chip of RCV420 and model be ISO122.The master die analog quantity input signal of the 4-20mA that sensor in the embedded control system of electric melting magnesium furnace provides by the analog input signal conversion chip being RCV420 by model converts the embedded controller acceptable analog input voltage signal of 0-5V to.Be that the analog input isolating chip of ISO122 is isolated these two kinds of signals by model.The annexation of model to be the analog input signal conversion chip of RCV420 and model the be analog input isolating chip of ISO122, as shown in Figure 3.Analog input signal conversion chip for model is RCV420: its 3rd pin access analog input signal AI0; Its 1st, 6,7,8,9 pins are unsettled; Its 2nd pin be connected in analog; Its 4th pin is connected with the negative terminal of 12V power supply; Its 5th pin be connected in analog; Electric capacity C4 in analog and by 1uf between the negative terminal of 12V power supply is connected; Its 10th, 11,12 pin interconnection; Its 13rd pin be connected in analog; Its 14th, 15 pins interconnect, and export the analog input signal after conversion; Its 16th pin is connected with the anode of 12V power supply, and by the C1 of electric capacity 1uf be connected in analog.Analog input isolating chip for model is ISO122: its 1st pin is connected with 12V power positive end; Its 2nd pin is connected with 12V power supply negative terminal; The 7th pin carrying out exporting for the analog input signal VIN0 after isolation is connected with embedded controller the corresponding interface; Its 8th pin be connected in analog; Its 9th pin is connected with 15V power supply negative terminal; Its 10th pin is connected with 15V power positive end; Its 15th pin and model are that the 14th of RCV420 analog input conversion chip is connected with 15 pins, the analog input signal after access conversion; Its 16th pin be connected in analog.
Topworks's frequency converter due to electric melting magnesium furnace embedded control system needs the master die analog quantity signal of 4-20mA to drive, but embedded controller analog output maximum current is 3mA, therefore conversion must be isolated accordingly, to increase the driving force of embedded controller.The analog quantity output signals of embedded controller is converted to the master die analog quantity signal of the 4-20mA in electric melting magnesium furnace embedded control system needed for frequency converter by present embodiment by the isolation of analog quantity output signals and modular converter, isolate these two kinds of signals simultaneously.What the isolation of the analog quantity output signals of present embodiment and modular converter adopted is model is the amplifier chip of OP07, physical circuit annexation as shown in Figure 4: its 1st, 5,8 pins are unsettled; Its 2nd pin connects the 6th pin, is connected with corresponding topworks's frequency converter the 6th pin that exports of analog quantity output signals VO3 after isolation and conversion; The corresponding analog quantity output signals VOT3 of its 3rd pin access embedded controller; Its 4th pin is connected with 12V power-, and by the electric capacity C36 of 0.1uf be connected in analog; Its 7th pin is just connected with 12V power supply, and by the electric capacity C32 of 0.1uf be connected in analog.
Because sensor digital amount in electric melting magnesium furnace embedded control system exports as 24V switching signal, embedded controller acceptable digital quantity input signal is 5V switching signal, therefore need 24V switching signal to be converted to 5V switching signal, and digital quantity input signal is isolated.Present embodiment converts by the 24V on-off model that sensor in the embedded control system of electric melting magnesium furnace provides by isolation and the modular converter of digital quantity input signal the 5V on-off model that embedded controller can receive to, isolates these two kinds of signals simultaneously.What the isolation of the digital quantity input signal of present embodiment and modular converter adopted is model is the 4 passage opto-coupler chips of TLP281-4.The circuit theory diagrams of TLP281-4, physical circuit annexation as shown in Figure 5: its 1st, 3,5,7 pins resistance R2, R4, R8 and R12 respectively through being 10K access the digital output signal DI0-DI3 of sensor; Its 2nd, 4,6,8 pins are connected respectively with digitally; Its 10th, 12,14,16 pins are connected with power vd D respectively; Export the 15th of the digital quantity input signal 1PA0-1PA3 after isolation and conversion the, 13,11, the 9 pins interface corresponding to embedded controller is connected, while its 15th, 13,11,9 pins also respectively through 5K resistance R7, R11, R14 and R16 be digitally connected.
The digital quantity signal that self can export due to electric melting magnesium furnace embedded controller is 5V switching signal, and electric melting magnesium furnace industry spot needs electric melting magnesium furnace embedded controller digital output can drive 24V relay usually, therefore digital output isolation and change-over circuit need 5V switching value to be converted to 24V switching signal, and realize signal isolation.Present embodiment converts the 24V on-off model needed for the relay of electric melting magnesium furnace industry spot to by the 5V switching signal that embedded controller exports by isolation and the modular converter of digital output signal, isolates these two kinds of signals simultaneously.What the isolation of the digital output signal of present embodiment and modular converter adopted is model is the driving chip of ULN2003D, physical circuit annexation as shown in Figure 6: its 1-7 pin accesses the digital output signal 2PB0-2PB6 of embedded controller respectively; Its 8th pin be digitally connected; Its 9th pin is connected with power vd D; Its 10th pin is connected with coil one end of relay K 7, the coil other end of relay K 7 is connected with power vd D, one end, contact of relay K 7 is just connected with 24V power supply, and the contact other end of relay K 7 as the digital output DO6 after isolation and conversion is connected with corresponding topworks; Its 11st pin is connected with coil one end of relay K 6, the coil other end of relay K 6 is connected with power vd D, one end, contact of relay K 6 is just connected with 24V power supply, and the contact other end of relay K 6 as the digital output DO5 after isolation and conversion is connected with corresponding topworks; Its 12nd pin is connected with coil one end of relay K 5, the coil other end of relay K 5 is connected with power vd D, one end, contact of relay K 5 is just connected with 24V power supply, and the contact other end of relay K 5 as the digital output DO4 after isolation and conversion is connected with corresponding topworks; Its 13rd pin is connected with coil one end of relay K 4, the coil other end of relay K 4 is connected with power vd D, one end, contact of relay K 4 is just connected with 24V power supply, and the contact other end of relay K 4 as the digital output DO3 after isolation and conversion is connected with corresponding topworks; Its 14th pin is connected with coil one end of relay K 3, the coil other end of relay K 3 is connected with power vd D, one end, contact of relay K 3 is just connected with 24V power supply, and the contact other end of relay K 3 as the digital output DO2 after isolation and conversion is connected with corresponding topworks; Its 15th pin is connected with coil one end of relay K 2, the coil other end of relay K 2 is connected with power vd D, one end, contact of relay K 2 is just connected with 24V power supply, and the contact other end of relay K 2 as the digital output DO1 after isolation and conversion is connected with corresponding topworks; Its 16th pin is connected with coil one end of relay K 1, the coil other end of relay K 1 is connected with power vd D, one end, contact of relay K 1 is just connected with 24V power supply, and the contact other end of relay K 1 as the digital output DO0 after isolation and conversion is connected with corresponding topworks (such as relay, contactor etc.).
The above-mentioned signal regulating device being a kind of electric melting magnesium furnace embedded controller provided by the invention, this device can realize isolation to electric melting magnesium furnace embedded controller input/output signal and conversion, guarantee the normal use of electric melting magnesium furnace embedded controller, and effectively can reduce the interference of spiking to electric melting magnesium furnace embedded controller, reduce the damaged risk of electric melting magnesium furnace embedded controller, these will directly improve security and the control accuracy of whole electric melting magnesium furnace embedded control system.
Claims (10)
1. a signal regulating device for electric melting magnesium furnace embedded controller, is characterized in that: comprising: be integrated in the isolation of several analog input signals on same circuit board and modular converter, the isolation of several analog quantity output signals and modular converter, the isolation of several digital quantity input signals and modular converter, the isolation of several digital output signals and modular converter; The described isolation of analog input signal is connected with the output terminal of respective sensor in the embedded control system of electric melting magnesium furnace with the input end of modular converter, and the isolation of the analog input signal input end corresponding with described electric melting magnesium furnace embedded controller to the output terminal of modular converter is connected; The isolation of the described analog quantity output signals output terminal corresponding with described electric melting magnesium furnace embedded controller to the input end of modular converter is connected, and the input end of the topworks that the isolation of analog quantity output signals is corresponding with electric melting magnesium furnace embedded control system to the output terminal of modular converter is connected; The described isolation of digital quantity input signal is connected with the output terminal of respective sensor in described electric melting magnesium furnace embedded control system with the input end of modular converter, and the isolation of the digital quantity input signal input end corresponding with described electric melting magnesium furnace embedded controller to the output terminal of modular converter is connected; The described isolation of digital output signal is connected with the output terminal of the input end of modular converter with described electric melting magnesium furnace embedded controller, and the input end of the topworks that the isolation of digital output signal is corresponding with electric melting magnesium furnace embedded control system to the output terminal of modular converter is connected.
2. the signal regulating device of electric melting magnesium furnace embedded controller according to claim 1, is characterized in that: the quantity of the corresponding sensor that the isolation of described analog input signal and the isolation of modular converter, analog quantity output signals and the isolation of modular converter, digital quantity input signal and the isolation of modular converter, digital output signal and modular converter quantity are separately connected separately by it or topworks determines.
3. the signal regulating device of electric melting magnesium furnace embedded controller according to claim 1, it is characterized in that: the isolation of described analog input signal and modular converter, master die analog quantity input signal for the 4-20mA provided by sensor in the embedded control system of molten magnesium stove converts the embedded controller acceptable analog input signal of 0-5V to, isolates these two kinds of signals simultaneously.
4. the signal regulating device of electric melting magnesium furnace embedded controller according to claim 1, it is characterized in that: the isolation of analog quantity output signals and modular converter, for the analog quantity output signals of embedded controller being converted to the master die analog quantity signal needed for the corresponding topworks of electric melting magnesium furnace embedded control system, these two kinds of signals are isolated simultaneously.
5. the signal regulating device of electric melting magnesium furnace embedded controller according to claim 1, it is characterized in that: the isolation of digital quantity input signal and modular converter: the 24V on-off model for being provided by sensor in the embedded control system of molten magnesium stove converts the 5V on-off model that embedded controller can receive to, these two kinds of signals being isolated simultaneously.
6. the signal regulating device of electric melting magnesium furnace embedded controller according to claim 1, it is characterized in that: the isolation of digital output signal and modular converter: the 5V on-off model for being exported by embedded controller converts the 24V on-off model needed for the corresponding topworks of electric melting magnesium furnace industry spot to, these two kinds of signals being isolated simultaneously.
7. the signal regulating device of the electric melting magnesium furnace embedded controller according to claim 1 or 3, is characterized in that: the isolation of described analog input signal and modular converter are made up of the analog input isolating chip of model to be the analog input signal conversion chip of RCV420 and model be ISO122.
8. the signal regulating device of the electric melting magnesium furnace embedded controller according to claim 1 or 4, is characterized in that: what the isolation of described analog quantity output signals and modular converter adopted is model is the amplifier chip of OP07.
9. the signal regulating device of electric melting magnesium furnace embedded controller according to claim 1 or 5, is characterized in that: what the isolation of described digital quantity input signal and modular converter adopted is model is the 4 passage opto-coupler chips of TLP281-4.
10. the signal regulating device of the electric melting magnesium furnace embedded controller according to claim 1 or 6, is characterized in that: what the isolation of described digital output signal and modular converter adopted is model is the driving chip of ULN2003D.
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| CN201510964713.4A CN105446222A (en) | 2015-12-18 | 2015-12-18 | Signal conditioning device of electric smelting magnesia furnace embedded controller |
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| CN201510964713.4A CN105446222A (en) | 2015-12-18 | 2015-12-18 | Signal conditioning device of electric smelting magnesia furnace embedded controller |
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Cited By (2)
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| CN106249689A (en) * | 2016-09-19 | 2016-12-21 | 东北大学 | A kind of based on the electric melting magnesium furnace data collecting system being wirelessly transferred and method |
| CN107449451A (en) * | 2016-04-01 | 2017-12-08 | 株式会社捷太格特 | Sensor device |
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