CN110907348A - Intelligent full-automatic liquid-phase corrosion tester and control method thereof - Google Patents
Intelligent full-automatic liquid-phase corrosion tester and control method thereof Download PDFInfo
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- 239000003990 capacitor Substances 0.000 claims description 79
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention discloses an intelligent full-automatic determinator for liquid-phase corrosion and a control method thereof, wherein the determinator comprises a temperature acquisition module, a heating pipe, a signal acquisition module, a main control module, a video monitoring module, a control output module and an alarm output module, wherein the output ends of the temperature acquisition module and the signal acquisition module are connected with the input end of the main control module; the video monitoring module is a network camera, is in communication connection with the main control module and is arranged in the area where the full-automatic determinator is located; the invention has the advantages that: the temperature is accurately controlled without the need of personnel on duty.
Description
Technical Field
The invention relates to the technical field of oil for electric power, in particular to an intelligent full-automatic tester for liquid-phase corrosion and a control method thereof.
Background
The steam turbine unit inevitably has water and steam to invade at the operation in-process, and the moisture that exists in the steam turbine oil and water-soluble acid can lead to the oil to take place oxidation and degradation constantly in the operation to produce some organic acids and other corrosivity products, lead to the corruption of different degrees to whole lubricating system metal parts, can lead to the unit to block in the time of serious even, seriously threatens unit operation safety. Therefore, the antirust performance is a key index for quality supervision of the turbine oil, and the mineral turbine oil for the power plant is subjected to an oil antirust performance test according to a method in GB/T11143' antirust performance test method of mineral oil with an inhibitor in the presence of water in the process of quality supervision when new oil is received and regular quality supervision in operation.
According to the national standard GB/T11143 'antirust performance test method of mineral oil with inhibitor in the presence of water' and referring to the method in American society for testing and materials standard ASTM D665-03.MOD, a certain volume of test oil and distilled water are mixed according to the proportion of 10:1, then a cylindrical test steel bar is stirred at 60 ℃, the corrosion condition of the steel bar is observed after 24 hours, and the temperature control is realized by placing the test oil and a container in an oil bath or a water bath for heating by using a plurality of instruments currently applied in China. However, due to poor temperature control precision and signal drift of the temperature control sensor, the temperature in the whole test process is difficult to be accurately controlled, and certain deviation is brought to the test result. Potential safety hazards exist due to the lack of protection functions such as dry burning prevention and automatic water replenishing in the heating process; the professional can not modify the test setting, and can perform personalized setting on the test process according to different requirements; the bathtub cannot be freely disassembled and is inconvenient to clean, and a large amount of bacteria are bred in the bathtub after long-term use; the phenomena that the rotating motor stops stirring accidentally and the like also happen occasionally, so that a full-time worker has to watch the test for 24 hours in the whole test process, and certain inconvenience is brought to work.
Chinese patent publication No. CN208297313U discloses a liquid-phase corrosion tester, which comprises a magnetic stirrer, a sample cup arranged at a test working position of the magnetic stirrer, a pad arranged around the test working position, a cover arranged at the top end of the sample cup, and a housing supporting the cover; the bottom of the magnetic stirrer is heated and is stirred electromagnetically, so that the noise is reduced, the stirring damage rate is low, and the normal work is not influenced; and meanwhile, the cover body is added, so that the worker can not be injured due to misoperation or mistaken contact with the test device when approaching the test device, and the safety of the liquid-phase corrosion tester is improved. This patent technique is mainly improved from the mechanical structure of liquid phase corrosion apparatus, has increased the security of this liquid phase corrosion apparatus, but it lacks the circuit structure improvement to the liquid phase corrosion apparatus, can not solve the problem that the liquid phase corrosion apparatus that prior art exists needs personnel's 24 hours time value to guard on and the temperature can not accurate control.
Disclosure of Invention
The invention aims to solve the technical problem of how to provide an intelligent full-automatic determinator for liquid-phase corrosion and a control method thereof so as to realize accurate temperature control and avoid the need of personnel on duty.
The invention solves the technical problems through the following technical means: an intelligent full-automatic determinator for liquid-phase corrosion comprises a temperature acquisition module, a heating pipe, a signal acquisition module, a main control module, a video monitoring module, a control output module and an alarm output module, wherein the output ends of the temperature acquisition module and the signal acquisition module are connected with the input end of the main control module, the output end of the main control module is respectively connected with the input end of the control output module, the input end of the heating pipe and the input end of the alarm output module, and the output end of the control output module is connected with a load; the video monitoring module is a network camera, the video monitoring module is in communication connection with the main control module, and the video monitoring module is installed in the area where the full-automatic determinator is located.
Through the arrangement of the video monitoring module, during the test operation period, the video monitoring module collects the operation images of the full-automatic measuring instruments, all the full-automatic measuring instruments under the same local area network are connected in a wired or wireless mode to obtain omnibearing equipment operation information, the signal collecting module collects state information such as voltage, current and the like to the control module, if the equipment is abnormal, a shutdown measure or an alarm output module is adopted to give an alarm through the control output module, and a person does not need to watch on the equipment for 24 hours; meanwhile, the temperature of the liquid bath is collected by the temperature collecting module and fed back to the main control module, and the main control module controls the heating pipe to heat the liquid bath or stop heating, so that the temperature is accurately controlled.
Preferably, the control output module comprises a rotation speed acquisition unit, the rotation speed acquisition unit comprises a resistor R20, a bidirectional voltage stabilizing diode D2, a voltage follower U5, a resistor R21, a photocoupler CO1, a resistor R22 and a light emitting diode D1, one end of the resistor R20 is connected with the output voltage + Vm of the motor, the other end of the resistor R20 is connected with one end of a bidirectional voltage stabilizing diode D2, and the other end of the bidirectional voltage stabilizing diode D2 is connected with the ground GNDm; the other end of the resistor R20 and a connecting wire of the bidirectional voltage-stabilizing diode D2 are connected with a signal output end of a Hall sensor CT1, and the Hall sensor CT1 is installed at the position of a motor rotor; the in-phase end of the voltage follower U5 is connected with the other end of the resistor R20, the out-phase end of the voltage follower U5 is connected with one end of the resistor R21, one end of the resistor R21 is connected with the output end of the voltage follower U5, the positive power supply end of the voltage follower U5 is connected with the power supply + Va, and the negative power supply end of the voltage follower U5 is grounded GNDa; the other end of the resistor R21 is connected with a first pin of a photoelectric coupler CO1, and a second pin of the photoelectric coupler CO1 is connected with the negative power supply end of a voltage follower U5; the third pin of the photocoupler CO1 is grounded GND, the fourth pin of the photocoupler CO1 is connected with the cathode of the light emitting diode D1 through a resistor R22, the anode of the light emitting diode D1 is connected with a power VCC, and the fourth pin of the photocoupler CO1 is connected with the main control module. The input signal comes from a Hall sensor, a resistor R20 pulls up a Hall pulse signal, a bidirectional voltage stabilizing diode D2 limits the voltage value of the Hall signal, and input voltage protection is carried out on a voltage follower U5. The voltage follower U5 increases the hall signal driving ability, and optoelectronic coupler CO1 carries out photoelectric isolation with analog signal and digital signal, guarantees that system digital circuit and analog circuit do not disturb each other, uses emitting diode D1 to indicate the hall signal, and hall signal pulse is exported to connecing the main control module through optoelectronic coupler CO 1's fourth pin simultaneously.
Preferably, the temperature acquisition module comprises a constant current source unit, an amplification unit and a subtraction unit, the constant current source unit, the amplification unit and the subtraction unit are sequentially connected, the constant current source module comprises an operational amplifier U3, a resistor R7, a resistor R11, a resistor R17 and a capacitor C4, the non-inverting terminal of the operational amplifier U3 is connected to a comparison voltage source Vref, the inverting terminal of the operational amplifier U3 is connected to one end of a capacitor C4, the positive power terminal of the operational amplifier U3 is connected to a power + V, the negative power terminal of the operational amplifier U3 is connected to a power-V, one end of the resistor R7 is connected to the positive power terminal of the operational amplifier U3, one end of the resistor R11 is connected to the output terminal of the operational amplifier U3, the other end of the capacitor C4 is grounded GND, one end of the resistor R17 is connected to one end of the capacitor C4. The operational amplifier U3, the resistor R7, the resistor R11 and the resistor R17 form a constant current branch circuit, and the constant current value of the constant current branch circuit is IAC＝Vref/R17。
Preferably, the amplifying unit comprises a thermistor PT1, a resistor R13, a resistor R6, a resistor R9, a resistor R12, a resistor R15, an operational amplifier U2, an operational amplifier U4, a resistor R10, a resistor R16, a resistor R14 and a capacitor C3, wherein the other end of the resistor R7 and the other end of the resistor R11 are connected to one end of the thermistor PT1, the other end of the thermistor PT1 is connected to one end of the resistor R13, and the other end of the resistor R13 is connected to one end of the resistor R17; one end of the resistor R6 is connected with one end of the thermistor PT1, the other end of the resistor R6 is connected with the in-phase end of the operational amplifier U2, the reverse end of the operational amplifier U2 is connected with one end of the resistor R9, the other end of the resistor R9 is connected with the other end of the thermistor PT1, one end of the resistor R12 is connected with one end of the resistor R13, the other end of the resistor R12 is connected with the in-phase end of the operational amplifier U4, and the reverse end of the operational amplifier U4 is connected with one end of the resistor R17 through the resistor R15; one end of the resistor R10 is connected with the inverting end of the operational amplifier U2, and the other end of the resistor R10 is connected with the output end of the operational amplifier U2; one end of the resistor R16 is connected with the inverting end of the operational amplifier U4, and the other end of the resistor R16 is connected with the output end of the operational amplifier U4; one end of the resistor R14 is connected with the output end of the operational amplifier U4, the other end of the resistor R14 is connected with one end of the capacitor C3, and the other end of the capacitor C3 is grounded GND. The U2, R6, R9 and R10 form a homodromous negative feedback amplifying circuit, the thermistor PT1 is a PT100 temperature sensor, so that the change of the temperature value is converted into the change of the PT100 resistance value, the change of the voltage value is formed under the action of the constant current source, and the linearity of the PT100 resistance value along with the change of the temperature is kept. And amplifying the change of the voltage value, and then, entering a next-stage subtraction unit, wherein in the circuit design, R6 is R9, and the amplification factor is 1+ R10/R6.
Preferably, the subtracting unit comprises a resistor R5, a capacitor C2, a resistor R8, a resistor R3, a sliding resistor RW1, a resistor R2, an operational amplifier U1, a resistor R1, a resistor R4 and a capacitor C1, wherein one end of the resistor R5 is connected to the output end of the operational amplifier U2, the other end of the resistor R5 is connected to the in-phase end of the operational amplifier U1, the inverting end of the operational amplifier U1 is connected to the adjustable end of the sliding resistor RW1 through a resistor R3, one end of the sliding resistor RW1 is connected to one end of the resistor R2, the other end of the resistor R2 is connected to the comparison voltage source Vref, and the other end of the sliding resistor RW1 is connected to GND; one end of the resistor R1 is connected with the inverting end of the operational amplifier U1, the other end of the resistor R1 is connected with the output end of the operational amplifier U1, one end of the resistor R4 is connected with the output end of the operational amplifier U1, the other end of the resistor R4 is connected with one end of the capacitor C1, the other end of the capacitor C1 is connected with one end of the capacitor C2 and one end of the resistor R8 respectively and is grounded GND, and the other end of the capacitor C2 and the other end of the resistor R8 are connected with the same-phase end of the operational amplifier U1.
The PT100 temperature sensor has the characteristics that when the temperature value is 0 ℃, the resistance value of the PT100 temperature sensor is 100 omega and is less than 100 omega, and the resistance value represents the subzero temperature; a resistance greater than 100 Ω indicates an above-zero temperature. The system of the invention is a constant temperature bath, and is not required to be used at 0 ℃ or subzero temperature, so the subtraction circuit is designed, the voltage amplified by the amplifying unit is reduced, the output voltage value is always kept as positive voltage, and the output voltage value is reduced as much as possible, thereby the conversion range of the post-stage AD converter can be saved, and the resolution of temperature acquisition is improved.
Preferably, the control output module further includes a start-stop control unit, the start-stop control unit includes a driving chip U6, a resistor R25 and a solid relay J1, the model of the driving chip U6 is 74LVC4245, a pin a1 of the driving chip U6 is connected with one end of a resistor R25, the other end of the resistor R25 is connected with a first pin of the solid relay J1, a pin VCCB of the driving chip U6 is connected with a power source VCC, a pin B1 of the driving chip U6 is connected with the main control module, a second pin of the solid relay J1 is grounded GNDa, a fourth pin of the solid relay J1 is connected with a +24V power source, and a third pin of the solid relay J1 is connected with the positive terminal of the motor power source. The main control module sends a control start-stop signal, the isolation driving chip 74LVC4245 drives the isolation solid relay J1, and the power supply of the motor is switched on or off.
Preferably, the control output module further includes a rotation speed control unit, the rotation speed control unit includes an AD conversion chip U7, a capacitor C7, a capacitor C8, a capacitor C5, a resistor R26, an operational amplifier U8, a resistor R27, and a capacitor C6, a pin SCLK, a pin SDI, a pin SDO of the AD conversion chip U7
And a pin
And a pin
The power supply is connected with a main control module, a pin Vlogic of an AD conversion chip U7 is connected with a power supply VCC, a pin VDD of an AD conversion chip U7 is connected with a power supply + Va, a pin Vrefout of an AD conversion chip U7 is grounded GNDa through a capacitor C8, a pin GAIN of the AD conversion chip U7 is connected with the power supply VCC, one end of a capacitor C7 is connected with the power supply VCC, the other end of a capacitor C7 is grounded GND, a pin RSTSEL of an AD conversion chip U7 is connected with the other end of the capacitor C7, and a pin GND of an AD conversion chip U7 is grounded GND; pin V of AD conversion chip U7OThe resistor 0 is connected with one end of a resistor R26, one end of a capacitor C5 is connected with one end of a resistor R26, the other end of the capacitor C5 is connected with GNDa, the other end of the resistor R26 is connected with the in-phase end of an operational amplifier U8, the inverting end of the operational amplifier U8 is connected with one end of a resistor R27, the positive power supply end of the operational amplifier U8 is connected with + Va, the negative power supply end of the operational amplifier U8 is connected with the other end of a capacitor C5, one end of the resistor R27 is connected with the output end of the operational amplifier U8, the other end of the resistor R27 is connected with one end of a capacitor C6, the other end of the capacitor C6 is connected with the negative power supply end of the operational amplifier U8, the other end of the resistor R27 is. The SPI interface of the main control module sends an SPI instruction to an AD conversion chip U7, and after the SPI instruction is correctly received, a target voltage value is output to a target channel pin, for example, a pin V of an AD conversion chip U7O0, obtaining output voltage, and applying the output voltage to a motor speed regulation lead after the driving capability is improved by the operational amplifier U8, thereby changing the rotating speed of the motor.
Preferably, the model of the main control module is STM32F103VCT6, a pin B1 of the driving chip U6 is connected to an eighty-first pin of the main control module, the other end of the resistor R4 is connected to a twenty-third pin of the main control module, the other end of the resistor R14 is connected to a twenty-fourth pin of the main control module, a fourth pin of the photocoupler CO1 is connected to a sixty-second pin of the main control module, and a pin SCLK, a pin SDI, a pin SDO and a pin of the AD conversion chip U7 are connected to a sixty-second pin of the main control module
And a pin
And a pin
And the thirty-third pin, the thirty-second pin, the thirty-eleventh pin, the twenty-ninth pin, the thirty-third pin and the thirty-fourth pin of the main control chip are respectively connected in a one-to-one correspondence manner.
Preferably, the liquid phase corrosion intelligent full-automatic determinator further comprises a display, a liquid level switch, a liquid supplementing pump and a liquid discharging pump, wherein the display is connected with the main control module, the liquid supplementing pump and the liquid discharging pump are connected with the liquid level switch, and the liquid supplementing pump and the liquid discharging pump are connected with the main control module through the control output module.
The invention also provides a control method of the intelligent full-automatic determinator for liquid phase corrosion, when an operator issues a test starting instruction, a main control module detects a liquid level signal, if the liquid level does not meet the test requirement, an output module is controlled to automatically replenish liquid for a load, the test is started according to set test parameters after the test requirement is met, a temperature acquisition module acquires the temperature of a liquid bath in the whole test process, the change of the resistance value is generated according to the temperature value of the liquid bath, then the resistance value is converted into a voltage signal and sent to the main control module, an AD converter integrated in the main control module converts the voltage signal into a digital signal, then the digital signal representing the current temperature is output, the digital signal is used as an input value of PID operation to be subjected to mathematical calculation, heating signals with different pulse duty ratios are output, and heating pipes are controlled to be heated or stopped to be heated, through closed-loop control of one period, the actual temperature of the liquid bath changes, the change is received by the temperature acquisition module, then the next closed-loop control period is entered, PID closed-loop control is continuously carried out, and the constant temperature control of the liquid bath temperature is completed; checking the liquid bath state and the motor rotating speed at preset intervals, displaying the state information, and if the state information is abnormal, processing in a stopping and alarming mode; during the test operation, the network camera collects the operation images of the full-automatic measuring instruments, and all the full-automatic measuring instruments under the same local area network are connected in a wired or wireless mode to obtain the omnibearing equipment operation information.
The invention has the advantages that:
(1) according to the invention, through the arrangement of the video monitoring module, during the test operation period, the video monitoring module collects the operation images of the full-automatic measuring instruments, all the full-automatic measuring instruments under the same local area network are connected in a wired or wireless mode to obtain omnibearing equipment operation information, the signal collecting module collects state information such as voltage and current and the like to the control module, if the equipment is abnormal, a shutdown measure or an alarm output module is adopted to give an alarm through the control output module, and a person does not need to watch for 24 hours; meanwhile, the temperature of the liquid bath is collected by the temperature collecting module and fed back to the main control module, and the main control module controls the heating pipe to heat the liquid bath or stop heating, so that the temperature is accurately controlled.
(2) Through the design of liquid level switch, fluid infusion pump and flowing back pump, realize automatic water supply automatic drainage, prevent dry combustion method, improve test efficiency and experimental security.
Drawings
Fig. 1 is a block diagram of a circuit structure of an intelligent full-automatic liquid-phase corrosion tester disclosed in an embodiment of the present invention;
FIG. 2 is a schematic diagram of a circuit of a rotation speed acquisition unit of the intelligent full-automatic liquid-phase corrosion tester disclosed by the embodiment of the invention;
FIG. 3 is a schematic circuit diagram of a temperature acquisition module of the intelligent full-automatic liquid-phase rust tester according to the embodiment of the invention;
FIG. 4 is a schematic circuit diagram of a start-stop control unit of the intelligent full-automatic liquid-phase rust tester disclosed in the embodiments of the present invention;
fig. 5 is a schematic circuit diagram of a rotation speed control unit of the intelligent full-automatic liquid-phase corrosion tester according to the embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, an intelligent full-automatic determinator for liquid-phase corrosion comprises a temperature acquisition module, a heating pipe, a signal acquisition module, a main control module, a video monitoring module, a control output module and an alarm output module, wherein output ends of the temperature acquisition module and the signal acquisition module are connected with an input end of the main control module, an output end of the main control module is respectively connected with an input end of the control output module, an input end of the heating pipe and an input end of the alarm output module, and an output end of the control output module is connected with a load; the video monitoring module is a network camera, the video monitoring module is in communication connection with the main control module, and the video monitoring module is installed in the area where the full-automatic determinator is located.
The liquid phase corrosion intelligent full-automatic determinator further comprises a display, a liquid level switch, a liquid supplementing pump and a liquid discharging pump, wherein the display is connected with the main control module, the liquid supplementing pump and the liquid discharging pump are connected with the liquid level switch, and the liquid supplementing pump and the liquid discharging pump are connected with the main control module through a control output module.
The display adopts a 7-inch screen of an android4.1 operating system, the capacitive touch screen is improved in touch sensitivity, and the display has a wireless wifi function. The USB interface has the advantages of internet connection and USB connection interfaces, and abundant peripheral interfaces. The operation pages are switched by adopting sliding gestures, so that the operation is simple and quick. The web server is integrated in the display, the web server provides two service types, the web server and the VNCServer are respectively used for providing a monitoring function based on a browser, any intelligent terminal with a networking function can be used, a specific page on the server is accessed through a software browser, the equipment state is checked or an equipment operation instruction is issued, the web server has the characteristics of cross-platform, cross-equipment, multitask and multi-connection, and all common user terminals in the market are supported to access simultaneously. The VNCServer server is a common remote desktop connection, where an access terminal of a remote desktop is actually a display interface of the ANDROID, and the VNC server can obtain the same display interface as that of a field operation using device on any intelligent terminal accessing a network, so that an operator can conveniently and quickly know operation information of the device in an office or even a corridor.
The video monitoring module mainly adopts a wireless router to build a local area network, the network camera adopts wireless WIFI networking, and real-time images and recorded videos can be checked through monitoring software of the notebook. The network camera is installed in the position that can monitor whole equipment, gathers the image in real time and saves.
The circuit structure and principle of each block in fig. 1 are described in detail as follows:
as shown in fig. 2, the control output module includes a rotation speed acquisition unit, the rotation speed acquisition unit includes a resistor R20, a bidirectional zener diode D2, a voltage follower U5, a resistor R21, a photocoupler CO1, a resistor R22, and a light emitting diode D1, one end of the resistor R20 is connected to the motor output voltage + Vm, the other end of the resistor R20 is connected to one end of the bidirectional zener diode D2, and the other end of the bidirectional zener diode D2 is connected to the ground GNDm; the other end of the resistor R20 and a connecting wire of the bidirectional voltage-stabilizing diode D2 are connected with a signal output end of a Hall sensor CT1, and the Hall sensor CT1 is installed at the position of a motor rotor; the in-phase end of the voltage follower U5 is connected with the other end of the resistor R20, the out-phase end of the voltage follower U5 is connected with one end of the resistor R21, one end of the resistor R21 is connected with the output end of the voltage follower U5, the positive power supply end of the voltage follower U5 is connected with the power supply + Va, and the negative power supply end of the voltage follower U5 is grounded GNDa; the other end of the resistor R21 is connected with a first pin of a photoelectric coupler CO1, and a second pin of the photoelectric coupler CO1 is connected with the negative power supply end of a voltage follower U5; the third pin of the photocoupler CO1 is grounded GND, the fourth pin of the photocoupler CO1 is connected with the cathode of the light emitting diode D1 through a resistor R22, the anode of the light emitting diode D1 is connected with a power VCC, and the fourth pin of the photocoupler CO1 is connected with the main control module. The input signal comes from a Hall sensor, a resistor R20 pulls up a Hall pulse signal, a bidirectional voltage stabilizing diode D2 limits the voltage value of the Hall signal, and input voltage protection is carried out on a voltage follower U5. The voltage follower U5 increases the hall signal driving ability, and optoelectronic coupler CO1 carries out photoelectric isolation with analog signal and digital signal, guarantees that system digital circuit and analog circuit do not disturb each other, uses emitting diode D1 to indicate the hall signal, and hall signal pulse is exported to connecing the main control module through optoelectronic coupler CO 1's fourth pin simultaneously.
As shown in fig. 3, the temperature acquisition module includes a constant current source unit, an amplification unit, and a subtraction unit, which are connected in sequence, the constant current source module includes an operational amplifier U3, a resistor R7, a resistor R11, a resistor R17, and a capacitor C4, the non-inverting terminal of the operational amplifier U3 is connected to a comparison voltage source Vref, the inverting terminal of the operational amplifier U3 is connected to one end of a capacitor C4, the positive terminal of the operational amplifier U3 is connected to a power supply + V, the negative terminal of the operational amplifier U3 is connected to a power supply-V, one end of the resistor R7 is connected to the positive terminal of the operational amplifier U3, one end of the resistor R11 is connected to the output terminal of the operational amplifier U3, the other end of the capacitor C4 is grounded GND, one end of the resistor R17 is connected to one end of the capacitor C4, and the other end of the resistor. The operational amplifier U3, the resistor R7, the resistor R11 and the resistor R17 form a constant current branch circuit, and the constant current value of the constant current branch circuit is IAC＝Vref/R17。
The amplifying unit comprises a thermistor PT1, a resistor R13, a resistor R6, a resistor R9, a resistor R12, a resistor R15, an operational amplifier U2, an operational amplifier U4, a resistor R10, a resistor R16, a resistor R14 and a capacitor C3, wherein the other end of the resistor R7 and the other end of the resistor R11 are connected with one end of the thermistor PT1, the other end of the thermistor PT1 is connected with one end of a resistor R13, and the other end of the resistor R13 is connected with one end of a resistor R17; one end of the resistor R6 is connected with one end of the thermistor PT1, the other end of the resistor R6 is connected with the in-phase end of the operational amplifier U2, the reverse end of the operational amplifier U2 is connected with one end of the resistor R9, the other end of the resistor R9 is connected with the other end of the thermistor PT1, one end of the resistor R12 is connected with one end of the resistor R13, the other end of the resistor R12 is connected with the in-phase end of the operational amplifier U4, and the reverse end of the operational amplifier U4 is connected with one end of the resistor R17 through the resistor R15; one end of the resistor R10 is connected with the inverting end of the operational amplifier U2, and the other end of the resistor R10 is connected with the output end of the operational amplifier U2; one end of the resistor R16 is connected with the inverting end of the operational amplifier U4, and the other end of the resistor R16 is connected with the output end of the operational amplifier U4; one end of the resistor R14 is connected with the output end of the operational amplifier U4, the other end of the resistor R14 is connected with one end of the capacitor C3, and the other end of the capacitor C3 is grounded GND. The U2, R6, R9 and R10 form a homodromous negative feedback amplifying circuit, the thermistor PT1 is a PT100 temperature sensor, so that the change of the temperature value is converted into the change of the PT100 resistance value, the change of the voltage value is formed under the action of the constant current source, and the linearity of the PT100 resistance value along with the change of the temperature is kept. And amplifying the change of the voltage value, and then, entering a next-stage subtraction unit, wherein in the circuit design, R6 is R9, and the amplification factor is 1+ R10/R6.
The subtracting unit comprises a resistor R5, a capacitor C2, a resistor R8, a resistor R3, a sliding rheostat RW1, a resistor R2, an operational amplifier U1, a resistor R1, a resistor R4 and a capacitor C1, wherein one end of the resistor R5 is connected with the output end of the operational amplifier U2, the other end of the resistor R5 is connected with the in-phase end of the operational amplifier U1, the reverse-phase end of the operational amplifier U1 is connected with the adjustable end of the sliding rheostat RW1 through the resistor R3, one end of the sliding rheostat RW1 is connected with one end of the resistor R2, the other end of the resistor R2 is connected with a comparison voltage source Vref, and the other end of the sliding rheostat RW 1; one end of the resistor R1 is connected with the inverting end of the operational amplifier U1, the other end of the resistor R1 is connected with the output end of the operational amplifier U1, one end of the resistor R4 is connected with the output end of the operational amplifier U1, the other end of the resistor R4 is connected with one end of the capacitor C1, the other end of the capacitor C1 is connected with one end of the capacitor C2 and one end of the resistor R8 respectively and is grounded GND, and the other end of the capacitor C2 and the other end of the resistor R8 are connected with the same-phase end of the operational amplifier U1.
The PT100 temperature sensor has the characteristics that when the temperature value is 0 ℃, the resistance value of the PT100 temperature sensor is 100 omega and is less than 100 omega, and the resistance value represents the subzero temperature; a resistance greater than 100 Ω indicates an above-zero temperature. The system of the invention is a constant temperature bath, and is not required to be used at 0 ℃ or subzero temperature, so the subtraction circuit is designed, the voltage amplified by the amplifying unit is reduced, the output voltage value is always kept as positive voltage, and the output voltage value is reduced as much as possible, thereby the conversion range of the post-stage AD converter can be saved, and the resolution of temperature acquisition is improved.
As shown in fig. 4, the control output module further includes a start-stop control unit, the start-stop control unit includes a driving chip U6, a resistor R25 and a solid-state relay J1, the model of the driving chip U6 is 74LVC4245, a pin a1 of the driving chip U6 is connected to one end of the resistor R25, the other end of the resistor R25 is connected to a first pin of the solid-state relay J1, a pin VCCB of the driving chip U6 is connected to a power supply VCC, a pin B1 of the driving chip U6 is connected to the main control module, a second pin of the solid-state relay J1 is connected to the ground GNDa, a fourth pin of the solid-state relay J1 is connected to a +24V power supply, and a third pin of the solid-state relay J1 is connected to. The main control module sends a control start-stop signal, the isolation driving chip 74LVC4245 drives the isolation solid relay J1, and the power supply of the motor is switched on or off.
As shown in fig. 5, the control output module further includes a rotation speed control unit, the rotation speed control unit includes an AD conversion chip U7, a capacitor C7, a capacitor C8, a capacitor C5, a resistor R26, an operational amplifier U8, a resistor R27, and a capacitor C6, a pin SCLK, a pin SDI, a pin SDO, a pin SCLK of the AD conversion chip U7
And a pin
And a pin
The power supply is connected with a main control module, a pin Vlogic of an AD conversion chip U7 is connected with a power supply VCC, a pin VDD of an AD conversion chip U7 is connected with a power supply + Va, a pin Vrefout of an AD conversion chip U7 is grounded GNDa through a capacitor C8, a pin GAIN of the AD conversion chip U7 is connected with the power supply VCC, one end of a capacitor C7 is connected with the power supply VCC, the other end of a capacitor C7 is grounded GND, a pin RSTSEL of an AD conversion chip U7 is connected with the other end of the capacitor C7, and a pin GND of an AD conversion chip U7 is grounded GND; pin V of AD conversion chip U7O0 is connected with one end of a resistor R26, one end of a capacitor C5 is connected with one end of a resistor R26, the other end of the capacitor C5 is grounded GNDa, and the other end of the resistor R26 is connected with the groundThe non-inverting terminal of the operational amplifier U8, the inverting terminal of the operational amplifier U8 is connected with one terminal of a resistor R27, the positive power terminal of the operational amplifier U8 is connected with the power + Va, the negative power terminal of the operational amplifier U8 is connected with the other terminal of a capacitor C5, one terminal of a resistor R27 is connected with the output terminal of the operational amplifier U8, the other terminal of the resistor R27 is connected with one terminal of a capacitor C6, the other terminal of the capacitor C6 is connected with the negative power terminal of the operational amplifier U8, the other terminal of the resistor R27 is connected with a speed-adjusting lead of the motor, and the other terminal of the capacitor C6 is connected. The SPI interface of the main control module sends an SPI instruction to an AD conversion chip U7, and after the SPI instruction is correctly received, a target voltage value is output to a target channel pin, for example, a pin V of an AD conversion chip U7O0, obtaining output voltage, and applying the output voltage to a motor speed regulation lead after the driving capability is improved by the operational amplifier U8, thereby changing the rotating speed of the motor.
If an open-loop control system is adopted, when a motor of the stirrer breaks down or stops rotating and the load becomes large, the actual rotating speed of the stirrer may be lower than a theoretical rotating speed value or directly stops rotating, so that the possibility that the GB/T11143 test condition cannot be met is caused, and a closed-loop control loop needs to be adopted for reliable operation of the system. In order to complete the closed-loop control of the rotating speed of the stirrer, a direct current brushless motor capable of controlling the rotating speed and a Hall sensor are used to form a closed-loop control system. The Hall sensor detects the change of a magnetic field according to the Hall effect, cuts a magnetic line of force when the direct current brushless motor rotates, the Hall sensor can output a switching frequency signal, and the actual rotating speed of the direct current brushless motor can be calculated by counting the frequency signal, namely the work done by the rotating speed acquisition unit. The direct current brushless motor can control the rotating speed through PWM pulse waves, the PWM pulse waves calculate the waveform period and the pulse width through software, and the voltage is controlled by a switching tube to form a waveform. And (3) continuously comparing the actual rotating speed with the target rotating speed by combining a rotating speed signal detected by the Hall sensor in real time, and adjusting the period and the pulse width of a PWM (pulse-width modulation) waveform when deviation occurs to achieve the control purpose of the rotating speed constant speed of 1000r/min of the stirrer, namely the work of a rotating speed control unit and the closed-loop control of the whole process.
The model of the master control module is STM32F103VCT6, and a B1 pin of a drive chip U6 is connected with the second pin of the master control moduleEighty one pin, the other end of the resistor R4 is connected with the twenty third pin of the main control module, the other end of the resistor R14 is connected with the twenty fourth pin of the main control module, the fourth pin of the photoelectric coupler CO1 is connected with the sixty two pin of the main control module, and the pin SCLK, the pin SDI, the pin SDO and the pin SDO of the AD conversion chip U7
And a pin
And a pin
And the thirty-third pin, the thirty-second pin, the thirty-eleventh pin, the twenty-ninth pin, the thirty-third pin and the thirty-fourth pin of the main control chip are respectively connected in a one-to-one correspondence manner.
It should be noted that, according to the test method of GB/T11143, the whole test duration is 24 hours, because in the test process, the device is required to be in the power-on and heating state all the time, when working at night, in order to use electricity safety and laboratory safety, it is required that the personnel watch on, in order to reduce the workload of the laboratory staff, the running state of the device and the real-time image can be uploaded to the network server through the network function, even if the laboratory staff is not on site, it can be very convenient to check. The device collects the temperature signal, the rotating speed signal, the switching signal, the liquid level signal and the like of the device through interfaces such as local RS232, CAN, RS485, I2C and the like, and uploads all the signals to the ANDROID server. The android server is internally provided with a WebServer and a VNCServer and provides a network service function based on an HTTP protocol. Android server and user machine pass through the router and connect in same LAN, and the user machine can look over the running state of equipment through the server, and the user machine can be the computer that has Wlan network interface, also can be the handheld device that has WIFI connection function. Meanwhile, the android server can also send a status short message to the mobile phone through the mobile network. Besides the conventional software protection function, a hardware protection circuit is also adopted as a preparation scheme, and when software is crashed or an accident occurs, the hardware protection circuit can take effect, so that the absolute safety of the operation of the equipment is realized. The hardware protection circuit comprises the following items:
1. the temperature protection switch protects the temperature of 70 ℃, and when the liquid bath temperature exceeds 70 ℃, the software control is directly skipped, and the power supply of the heater is cut off.
2. The liquid level protection switch is used for attracting a power switch of a liquid replenishing pump of the equipment to automatically replenish liquid when liquid in the liquid bath is evaporated to be lower than the lowest liquid level line, and the liquid replenishing is automatically stopped when the liquid reaches the working liquid level; when the liquid level in the liquid bath caused by the effect of expansion with heat and contraction with cold is higher than the highest liquid level line, the power switch of the liquid discharge electromagnetic valve in the equipment is attracted to automatically discharge liquid, and the liquid discharge is automatically stopped when the liquid reaches the working liquid level.
3. The brushless motor overheating and overload protection switch cuts off the power supply of the brushless motor when detecting that the working current of the brushless motor is abnormal and is obviously larger or smaller than the rated working current of the brushless motor.
4. And when the AC 220V power supply connected to the equipment exceeds the range of 20%, the power supply of the equipment is automatically cut off.
The control method and the working process of the invention are as follows: when an operator issues a test starting instruction, the main control module detects a liquid level signal, if the liquid level does not meet the test requirement, the load is controlled by the control output module to automatically supplement liquid, the test is started according to set test parameters after the test requirement is met, the temperature acquisition module acquires the liquid bath temperature in the whole test process, the change of the resistance value is generated according to the liquid bath temperature value, the resistance value is converted into a voltage signal and is sent to the main control module, the voltage signal is converted into a digital signal by an AD converter integrated in the main control module, the digital signal representing the current temperature is output, the digital signal is used as an input value of PID operation to carry out mathematical calculation, heating signals with different pulse duty ratios are output, so that a heating pipe is controlled to be electrified and heated or stopped to be heated, the actual temperature of the liquid bath is changed through the closed-loop control, the change is received by the temperature acquisition module, and then the next closed-loop control cycle is entered, PID closed-loop control is continuously carried out, and the constant temperature control of the liquid bath temperature is completed; checking the liquid bath state and the motor rotating speed at preset intervals, displaying the state information, and if the state information is abnormal, processing in a stopping and alarming mode; during the test operation, the network camera collects the operation images of the full-automatic measuring instruments, and all the full-automatic measuring instruments under the same local area network are connected in a wired or wireless mode to obtain the omnibearing equipment operation information.
According to the intelligent full-automatic liquid-phase corrosion tester and the control method thereof, through the arrangement of the video monitoring module, during the test operation period, the video monitoring module collects the operation images of the full-automatic tester, all the full-automatic testers under the same local area network are connected in a wired or wireless mode to obtain the omnibearing equipment operation information, the signal acquisition module collects the state information such as voltage and current and the like to the control module, if the equipment is abnormal, the control output module takes a shutdown measure or an alarm output module to give an alarm, and a person is not required to watch on the intelligent full-automatic liquid-phase corrosion tester for 24 hours; meanwhile, the temperature of the liquid bath is collected by the temperature collecting module and fed back to the main control module, and the main control module controls the heating pipe to heat the liquid bath or stop heating, so that the temperature is accurately controlled.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The intelligent full-automatic determinator for liquid-phase corrosion is characterized by comprising a temperature acquisition module, a heating pipe, a signal acquisition module, a main control module, a video monitoring module, a control output module and an alarm output module, wherein the output ends of the temperature acquisition module and the signal acquisition module are connected with the input end of the main control module, the output end of the main control module is respectively connected with the input end of the control output module, the input end of the heating pipe and the input end of the alarm output module, and the output end of the control output module is connected with a load; the video monitoring module is a network camera, the video monitoring module is in communication connection with the main control module, and the video monitoring module is installed in the area where the full-automatic determinator is located.
2. The intelligent full-automatic liquid-phase rust tester as claimed in claim 1, wherein the control output module comprises a rotation speed acquisition unit, the rotation speed acquisition unit comprises a resistor R20, a bidirectional voltage-stabilizing diode D2, a voltage follower U5, a resistor R21, a photoelectric coupler CO1, a resistor R22 and a light-emitting diode D1, one end of the resistor R20 is connected with the motor output voltage + Vm, the other end of the resistor R20 is connected with one end of a bidirectional voltage-stabilizing diode D2, and the other end of the bidirectional voltage-stabilizing diode D2 is connected with the ground GNDm; the other end of the resistor R20 and a connecting wire of the bidirectional voltage-stabilizing diode D2 are connected with a signal output end of a Hall sensor CT1, and the Hall sensor CT1 is installed at the position of a motor rotor; the in-phase end of the voltage follower U5 is connected with the other end of the resistor R20, the out-phase end of the voltage follower U5 is connected with one end of the resistor R21, one end of the resistor R21 is connected with the output end of the voltage follower U5, the positive power supply end of the voltage follower U5 is connected with the power supply + Va, and the negative power supply end of the voltage follower U5 is grounded GNDa; the other end of the resistor R21 is connected with a first pin of a photoelectric coupler CO1, and a second pin of the photoelectric coupler CO1 is connected with the negative power supply end of a voltage follower U5; the third pin of the photocoupler CO1 is grounded GND, the fourth pin of the photocoupler CO1 is connected with the cathode of the light emitting diode D1 through a resistor R22, the anode of the light emitting diode D1 is connected with a power VCC, and the fourth pin of the photocoupler CO1 is connected with the main control module.
3. The intelligent full-automatic determinator for liquid-phase corrosion according to claim 1, the temperature acquisition module comprises a constant current source unit, an amplification unit and a subtraction unit which are sequentially connected, the constant current source module comprises an operational amplifier U3, a resistor R7, a resistor R11, a resistor R17 and a capacitor C4, the non-inverting terminal of the operational amplifier U3 is connected with a comparison voltage source Vref, the inverting terminal of the operational amplifier U3 is connected with one end of a capacitor C4, the positive power terminal of the operational amplifier U3 is connected with a power supply + V, the negative power terminal of the operational amplifier U3 is connected with the power supply-V, one end of the resistor R7 is connected with the positive end of a power supply of the operational amplifier U3, one end of the resistor R11 is connected with the output end of the operational amplifier U3, the other end of the capacitor C4 is grounded to GND, one end of the resistor R17 is connected with one end of the capacitor C4, and the other end of the resistor R17 is grounded to GND.
4. The intelligent full-automatic liquid-phase rust tester as claimed in claim 3, wherein the amplifying unit comprises a thermistor PT1, a resistor R13, a resistor R6, a resistor R9, a resistor R12, a resistor R15, an operational amplifier U2, an operational amplifier U4, a resistor R10, a resistor R16, a resistor R14 and a capacitor C3, wherein the other end of the resistor R7 and the other end of the resistor R11 are connected with one end of the thermistor PT1, the other end of the thermistor PT1 is connected with one end of the resistor R13, and the other end of the resistor R13 is connected with one end of the resistor R17; one end of the resistor R6 is connected with one end of the thermistor PT1, the other end of the resistor R6 is connected with the in-phase end of the operational amplifier U2, the reverse end of the operational amplifier U2 is connected with one end of the resistor R9, the other end of the resistor R9 is connected with the other end of the thermistor PT1, one end of the resistor R12 is connected with one end of the resistor R13, the other end of the resistor R12 is connected with the in-phase end of the operational amplifier U4, and the reverse end of the operational amplifier U4 is connected with one end of the resistor R17 through the resistor R15; one end of the resistor R10 is connected with the inverting end of the operational amplifier U2, and the other end of the resistor R10 is connected with the output end of the operational amplifier U2; one end of the resistor R16 is connected with the inverting end of the operational amplifier U4, and the other end of the resistor R16 is connected with the output end of the operational amplifier U4; one end of the resistor R14 is connected with the output end of the operational amplifier U4, the other end of the resistor R14 is connected with one end of the capacitor C3, and the other end of the capacitor C3 is grounded GND.
5. The intelligent full-automatic liquid-phase rust tester as claimed in claim 4, wherein the subtraction unit comprises a resistor R5, a capacitor C2, a resistor R8, a resistor R3, a sliding rheostat RW1, a resistor R2, an operational amplifier U1, a resistor R1, a resistor R4 and a capacitor C1, one end of the resistor R5 is connected with the output end of the operational amplifier U2, the other end of the resistor R5 is connected with the same-phase end of the operational amplifier U1, the opposite-phase end of the operational amplifier U1 is connected with the adjustable end of the sliding rheostat RW1 through a resistor R3, one end of the sliding rheostat 1 is connected with one end of a resistor R2, the other end of the resistor R2 is connected with a comparison voltage source Vref, and the other end of the sliding rheostat RW1 is grounded GND; one end of the resistor R1 is connected with the inverting end of the operational amplifier U1, the other end of the resistor R1 is connected with the output end of the operational amplifier U1, one end of the resistor R4 is connected with the output end of the operational amplifier U1, the other end of the resistor R4 is connected with one end of the capacitor C1, the other end of the capacitor C1 is connected with one end of the capacitor C2 and one end of the resistor R8 respectively and is grounded GND, and the other end of the capacitor C2 and the other end of the resistor R8 are connected with the same-phase end of the operational amplifier U1.
6. The intelligent full-automatic liquid-phase rust tester as claimed in claim 5, wherein the control output module further comprises a start-stop control unit, the start-stop control unit comprises a driving chip U6, a resistor R25 and a solid relay J1, the driving chip U6 is 74LVC4245, a pin A1 of the driving chip U6 is connected with one end of a resistor R25, the other end of the resistor R25 is connected with a first pin of the solid relay J1, a pin VCCB of the driving chip U6 is connected with a power VCC, a pin B1 of the driving chip U6 is connected with the main control module, a second pin of the solid relay J1 is grounded GNDa, a fourth pin of the solid relay J1 is connected with a +24V power supply, and a third pin of the solid relay J1 is connected with the positive end of the motor power supply.
7. The intelligent full-automatic liquid-phase rust tester as claimed in claim 6, wherein the control output module further comprises a rotation speed control unit, the rotation speed control unit comprises an AD conversion chip U7, a capacitor C7, a capacitor C8, a capacitor C5, a resistor R26, an operational amplifier U8, a resistor R27 and a capacitor C6, and a pin SCLK, a pin SDI, a pin SDO and a pin SDO of the AD conversion chip U7
Pin
And a pin
The power supply is connected with a main control module, a pin Vlogic of an AD conversion chip U7 is connected with a power supply VCC, a pin VDD of an AD conversion chip U7 is connected with a power supply + Va, a pin Vrefout of an AD conversion chip U7 is grounded GNDa through a capacitor C8, a pin GAIN of the AD conversion chip U7 is connected with the power supply VCC, one end of a capacitor C7 is connected with the power supply VCC, the other end of a capacitor C7 is grounded GND, a pin RSTSEL of an AD conversion chip U7 is connected with the other end of the capacitor C7, and a pin GND of an AD conversion chip U7 is grounded GND; pin V of AD conversion chip U7OThe resistor 0 is connected with one end of a resistor R26, one end of a capacitor C5 is connected with one end of a resistor R26, the other end of the capacitor C5 is connected with GNDa, the other end of the resistor R26 is connected with the in-phase end of an operational amplifier U8, the inverting end of the operational amplifier U8 is connected with one end of a resistor R27, the positive power supply end of the operational amplifier U8 is connected with + Va, the negative power supply end of the operational amplifier U8 is connected with the other end of a capacitor C5, one end of the resistor R27 is connected with the output end of the operational amplifier U8, the other end of the resistor R27 is connected with one end of a capacitor C6, the other end of the capacitor C6 is connected with the negative power supply end of the operational amplifier U8, the other end of the resistor R27 is.
8. The intelligent full-automatic liquid-phase rust tester as claimed in claim 7, wherein the model of the main control module is STM32F103VCT6, the pin B1 of the driving chip U6 is connected to the eighty-first pin of the main control module, the other end of the resistor R4 is connected to the twenty-third pin of the main control module, the other end of the resistor R14 is connected to the twenty-fourth pin of the main control module, the fourth pin of the photocoupler CO1 is connected to the sixty-second pin of the main control module, and the pins SCLK, SDI, SDO and SDO of the AD conversion chip U7 are connected to the pin SCLK, the pin SDI, the pin SDO and the pin sd
Pin
And a pin
And the thirty-third pin, the thirty-second pin, the thirty-eleventh pin, the twenty-ninth pin, the thirty-third pin and the thirty-fourth pin of the main control chip are respectively connected in a one-to-one correspondence manner.
9. The intelligent full-automatic determinator for liquid-phase corrosion according to claim 1, further comprising a display, a liquid level switch, a liquid supplementing pump and a liquid discharging pump, wherein the display is connected with the main control module, the liquid supplementing pump and the liquid discharging pump are connected with the liquid level switch, and the liquid supplementing pump and the liquid discharging pump are connected with the main control module through the control output module.
10. The method according to any one of claims 1 to 9, wherein after an operator issues a test start command, the main control module detects a liquid level signal, if the liquid level does not satisfy the test requirements, the main control module controls the load to automatically replenish liquid, after the test requirements are satisfied, the test is started according to the set test parameters, the temperature acquisition module acquires the liquid bath temperature during the whole test process, the resistance value changes according to the liquid bath temperature value, the resistance value is converted into a voltage signal and sent to the main control module, the voltage signal is converted into a digital signal by an AD converter integrated in the main control module, the digital signal is output as a digital signal representing the current temperature, the digital signal is used as an input value of PID operation to perform mathematical calculation, and heating signals with different pulse duty ratios are output, the heating pipe is controlled to be electrified and heated or to stop heating, the actual temperature of the liquid bath changes through closed-loop control in one period, the change is received by the temperature acquisition module, and then the next closed-loop control period is entered, PID closed-loop control is continuously carried out, and the constant temperature control of the liquid bath temperature is completed; checking the liquid bath state and the motor rotating speed at preset intervals, displaying the state information, and if the state information is abnormal, processing in a stopping and alarming mode; during the test operation, the network camera collects the operation images of the full-automatic measuring instruments, and all the full-automatic measuring instruments under the same local area network are connected in a wired or wireless mode to obtain the omnibearing equipment operation information.
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| CN117589323A (en) * | 2024-01-19 | 2024-02-23 | 常州通宝光电股份有限公司 | High-voltage isolation area temperature acquisition circuit |
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