CN105116939B - A kind of aluminium section bar passivating process electrical conductivity detection control apparatus - Google Patents

Abstract

The invention discloses a conductivity detection and control device in the passivation process of aluminum profiles, which includes a casing and a panel respectively installed in the casing, a liquid crystal touch screen, a main board, a power supply and a metering pump driving board, four switching power supply modules, Cable, AC power filter, power input and output socket, two-way conductivity electrode cable connector, two-way temperature cable connector, four-way metering pump drive output socket, ground terminal, CAN bus connection socket, power supply and metering pump drive board are equipped with shielding The main board is equipped with a shielded white iron plate. On the panel, its power switch button is connected to the power supply and the button S14 on the metering pump driver board, its power indicator is connected to the power supply and the light-emitting diode L17 on the metering pump driver board, and its reset button Connect to button S1 on the main board; AC15~AC18 on the power supply and metering pump drive board connect to four switching power supply modules and power output, and the power output supplies power to three CAN terminals. The invention has the advantages of low manufacturing cost, high measurement precision, strong anti-interference ability, convenient maintenance and the like.

Description

A conductivity detection and control device for aluminum profile passivation process

technical field

The invention belongs to the field of on-line detection of chemical process parameters, and relates to on-line indirect detection and control of the concentration of conductive solution on the industrial site, in particular to a conductivity detection and control device for the passivation process of aluminum profiles.

Background technique

In the chemical reaction process, the conductivity is an important parameter of the solution, its size directly reflects the conductivity of the solution, and is closely related to the concentration of the electrolyte; in these occasions where the conductivity is used as an intermediate variable for other parameter detection, a certain parameter is required. A stable and accurate conductivity detection device; at present, during the passivation treatment of the aluminum profile surface, due to the harsh environment on site, the solution is extremely corrosive, and may accumulate scale, which requires regular maintenance. Only a few foreign manufacturers have installed instruments It is used in domestic production sites, and there are almost no conductivity detectors produced by domestic manufacturers; therefore, it is necessary to design a set of conductivity detection and control devices for the passivation process of aluminum profiles that are matched with seven-electrode sensors and can be networked. Anti-scaling; Most of the equipment imported from abroad is expensive and difficult to repair and maintain.

Contents of the invention

The object of the present invention is to provide a conductivity detection and control device in the passivation process of aluminum profiles in order to solve the above-mentioned shortcomings in the prior art. The power supply part is strengthened with filters and solid capacitors. The analog part uses one-thousandth precision standard resistors and precision AC operational amplifiers. All signal grounds are connected to the shell through safety capacitors and then grounded, so they have strong anti-interference ability. Due to the use of step-by-step precision AC constant current excitation, it has a certain ability to resist electrode fouling; the circuit structure is further simplified, and the standard industrial control LCD touch screen is used to display and operate the data, which is convenient for data exchange with standard equipment. The invention has the advantages of high measurement accuracy, high reliability, multiple functions, low cost, high degree of intelligence, convenient manufacturing and maintenance, and the ability to network with other equipment. The invention can be connected not only to seven-electrode conductivity sensors, but also to four-electrode The present invention is equipped with two-way direct conductivity measurement and control, and the measuring range is equipped with three gears, the measuring range is 200uS/cm～200mS/cm, and the measuring range can be further expanded by cooperating with electrodes with various conductivity constants. The excitation frequency is adjustable, tentatively set at 20,000Hz for ultra-high frequency; in addition, as the host, it receives the conductivity, temperature, pump switch, and alarm signals sent by three sets of single-channel seven-electrode conductivity detection monitors, and displays and controls them; In the present invention, the first path is configured as pre-degreasing conductivity detection and dosing control, the second path is configured as degreasing conductivity detection and dosing control, the third path is configured as once-cleaning conductivity detection and water change control, and the fourth path is configured For the conductivity detection and dosing control of the passivation process, the fifth channel is configured for the conductivity detection and alarm of the second washing.

In order to achieve the above object, the technical solution provided by the present invention is: a conductivity detection and control device for the passivation process of aluminum profiles, including an organic casing and a panel respectively installed in the casing, a liquid crystal touch screen, a main board, a power supply and Metering pump drive board, four switching power supply modules, cables, AC power filter, power input and output sockets, two conductance electrode cable connectors, two temperature cable connectors, four metering pump drive output sockets, grounding terminal, CAN bus connection Socket, wherein, the power supply and the metering pump drive board are separately installed with a shielding box, and the main board is separately installed with a shielding white iron plate, and the LCD touch screen is installed on the panel, and the power supply of the main board and the metering pump are driven by cables. The board interface is connected with the power supply board and the main board interface of the metering pump driver board, so as to realize the interconnection of the power supply and the switch signal between the two boards; on the panel, the power switch button is connected with the power supply and metering pump driver board. Button S14, its power indicator light is connected to the power supply and the light-emitting diode L17 on the metering pump driver board, its reset button is connected to the button S1 on the main board; AC15~AC18 on the power supply and metering pump driver board are connected to four switching power supply modules and power output , the power output supplies power to three CAN terminals.

The panel is provided with a power switch button, a power indicator light, and a reset button; the LCD touch screen is equipped with a first conductivity display window, a second conductivity display window, a third conductivity display window, and a fourth conductivity display window. No. 1 conductivity display window, No. 5 conductivity display window, first electrode setting button, second electrode setting button, real-time curve button, current alarm button, historical curve button, CAN address display window, historical alarm button, CAN Communication status display window, fifth channel temperature display window, fourth channel temperature display window, third channel temperature display window, second channel temperature display window, first channel temperature display window, fifth channel alarm display window, fourth channel Alarm display window, third alarm display window, second alarm display window, first alarm display window, first manual on/off switching button, second manual on/off switching button, first automatic/ Manual switching button, second automatic/manual switching button, first pump switch indicator display window, second pump switch indicator display window, third pump switch indicator display window, fourth pump switch indicator display window, help button; the LCD touch screen is powered by an external DC24V, and the interface is connected to the corresponding point on the circuit board through a short cable.

The circuit of the main board is composed of a first on-chip system circuit, a digital power supply filter circuit for the main board, a safety capacitor circuit, an analog power supply filter circuit for the main board, a power supply and a reset circuit for the on-chip system, a signal switch and an analog signal limiter. Width protection circuit, CAN bus isolation drive circuit, internal operation circuit, LCD touch screen input/output communication interface circuit, display board communication interface circuit, switch output control circuit, power supply and metering pump drive board interface, conductance isolated analog power supply filter circuit, Safety capacitance two circuit, temperature one transmission isolation circuit, temperature one detection interface, conductance one measurement and AC to DC and isolation circuit, conductance one detection interface, constant current signal one drive circuit, conductance one jump gear transmission circuit, excitation Signal 1 generation circuit, precision power supply circuit, excitation signal 2 generation circuit, constant current signal 2 drive circuit, conductance 2 jump gear transmission circuit, conductance 2 detection interface, conductance 2 measurement and AC to DC and isolation circuit, temperature 2 detection interface , temperature two transmission isolation circuits are electrically connected together; among them, the interface of the power supply and the metering pump drive board are respectively connected to the corresponding points on the digital power filter circuit for the main board, the analog power filter circuit for the main board, and the isolated analog power filter circuit for conductance through the power line The digital power filter circuit for the main board is connected with the safety capacitor circuit, the CAN bus isolation drive circuit, the internal operation circuit, the LCD touch screen input/output communication interface circuit, the display panel communication interface circuit, and the switch through the power line. The corresponding points on the output control circuit, conductance one-step transmission circuit, and conductance two-step transmission circuit are connected; the power supply and reset circuit of the on-chip system are connected to the first on-chip system through the analog power line, digital power line and reset line respectively. The system circuit, the digital power filter circuit for the main board, the analog power filter circuit for the main board, the signal switching switch and the corresponding points on the analog signal limiting protection circuit are connected to provide high-quality analog power and digital power for the core of the system; the first on-chip system The circuit is connected to corresponding points on the internal operation circuit, switch output control circuit, conductance one-step transmission circuit, and conductance two-step transmission circuit through switch lines; the first on-chip system circuit is isolated from the CAN bus through communication lines The drive circuit, the LCD touch screen input/output communication interface circuit, and the corresponding points on the display panel communication interface circuit are connected to each other; CAN bus isolation connector CAN5 on the drive circuit is connected to the CAN bus, and JP4 on the LCD touch screen input/output communication interface circuit is connected to the LCD touch screen The signal switching switch and the analog signal limiting protection circuit are respectively connected with the first on-chip system circuit, the temperature-transmission isolation circuit, the conductance-1 measurement and AC to DC and isolation circuit through the analog signal line, the conductance-2 measurement and AC to DC and The isolation circuit and the temperature two transmission isolation circuit are connected to the corresponding points; the conductance isolation analog power supply filter circuit is respectively connected to the safety capacitor two circuit, the temperature one transmission isolation circuit, the temperature one detection interface, the conductance one measurement and the AC through the power line DC to DC and isolation circuit, constant current signal first drive circuit, precision power supply circuit, constant current signal second drive circuit, conductance second measurement and AC to DC And the isolation circuit, the second temperature detection interface, and the corresponding points on the second temperature transmission isolation circuit are connected; the first temperature detection interface is connected with the temperature first transmission isolation circuit through the signal line, and the semiconductor temperature first sensor is connected externally; the conductance first detection interface is respectively Through the signal line, the conductance-measurement is connected with the corresponding point on the AC to DC and isolation circuit, the constant current signal-drive circuit, and the conductance-sensor is connected externally; the constant current signal-drive circuit is also transmitted through the signal line and the conductance-transmission The circuit and the corresponding points on the excitation signal generation circuit are connected; the precision power supply circuit is connected to the corresponding points on the excitation signal generation circuit and the excitation signal generation circuit respectively through the power line; the temperature detection interface is connected to the temperature second transmission through the signal line The isolation circuit is connected, and the second semiconductor temperature sensor is connected externally; the second conductance detection interface is respectively connected to the corresponding points on the second conductance measurement and the AC to DC and isolation circuit, and the second constant current signal drive circuit through the signal line, and the second second conductance sensor is connected externally; The constant current signal second driving circuit is also connected with corresponding points on the excitation signal second generating circuit and the conductance second jump gear transmission circuit through signal wires.

The power supply and metering pump drive board are composed of AC220V total power input circuit, second on-chip system power circuit, second on-chip system circuit, reset and switch circuit, total power control solid state relay circuit, controlled power output circuit, external connection Switching power supply interface, digital power filter for main board, analog power filter for main board, isolated digital power filter for conductance, interface between power board and main board, solid state relay for metering pump control, and output drive interface for metering pump are composed of common electrical connections; , the AC220V total power input circuit is respectively connected to the corresponding points on the second on-chip system power circuit and the total power control solid state relay circuit through the power line, and the external AC220V power supply is connected; the second on-chip system circuit is connected through the power line, reset line, and switch line They are respectively connected to corresponding points on the second on-chip system power circuit, reset and switch circuit, and total power control solid state relay circuit; the controlled power output circuit is respectively connected to the total power control solid state relay circuit and the external switching power supply interface through the power line The corresponding points are connected; the external switching power supply interface is respectively connected to the corresponding points on the digital power filter for the main board, the analog power filter for the main board, and the isolated digital power filter for conductance through the power line, and three switching power supplies are connected externally; the power board The interface with the main board is connected to the corresponding points of the digital power filter for the main board, the analog power filter for the main board, the isolated digital power filter for conductance, and the solid state relay for metering pump control through the power line, and connected to the main board externally; the output drive of the metering pump The interface is connected to the corresponding point on the metering pump control solid state relay through the power line, and four external switches are connected to control the metering pump.

The first on-chip system circuit is composed of integrated circuit U1, crystal oscillator U2, connector J1, resistor R1, and capacitors C1-C22 electrically connected together; the power supply and reset circuit of the on-chip system are composed of voltage regulators U3 and U4, connectors J2, diodes D1-D4 and D6-D7, light-emitting diodes D5 and D8, resistors R2-R5, capacitors C23-C29, and button S1 are jointly electrically connected; the signal switching switch and analog signal limiting protection circuit are composed of electronic switch UK2, amplifier U5 and U6, voltage regulator chip U7, limiter protection chip U8, resistors RX2~RX13 and R6, capacitors C30~C37 and CX2, and light emitting diode L2 are electrically connected together; the digital power supply filter circuit for the motherboard is composed of magnetic beads RL3, Capacitor C38 is jointly electrically connected; the safety capacitor circuit is composed of magnetic beads RL4, resistor R7, and safety capacitor C39; the analog power supply filter circuit for the motherboard is composed of magnetic beads RL5 ~ RL7, and capacitors C40 ~ C41 are electrically connected ; The power supply and metering pump driver board interface is composed of connector P3; the conductance isolation analog power supply filter circuit is composed of magnetic beads RL8~RL10, capacitors C42~C43 are electrically connected together; the second safety capacitor circuit is composed of magnetic beads RL11, resistors R8, The safety capacitor C44 is composed of common electrical connection; the internal operation circuit is composed of the dial switch NBJ4 and the resistance R15 common electrical connection; the LCD touch screen input/output communication interface circuit is composed of integrated circuit U9, magnetic beads RL12, connectors P5 and JP4, resistors R9～R10, R13～R14, and capacitor C46 are electrically connected together; the display board communication interface circuit is composed of connector P4, resistors R11～R12, and capacitor C45 are electrically connected together; CAN bus isolation drive circuit is composed of integrated circuit U10 and connector CAN5 , resistors R16~R17, and capacitor C47 are electrically connected; the switch output control circuit is composed of isolated power module U11, optocoupler U12, inductors L6~L8, resistors R18~R19 and RX14, and capacitors C48~C50; The transmission isolation circuit is composed of amplifier U14, signal isolator U13, resistors R20~R22, and capacitors C51~C60; the temperature-detection interface is composed of connector JT7; the conductance-measurement and AC to DC and isolation circuit is composed of amplifier U16 and U18~U19 and U22, AC/DC signal converters U17 and U20, signal isolators U15 and U21, resistors R23~R27, capacitors C61~C84 are jointly electrically connected; conductance-detection interface is composed of connector JD8; constant current signal A drive circuit is composed of amplifiers U28 and U30~U31, resistors RO9~RO13 and RA9~RA21, capacitors C85~C88, C90~C91, C93~C94, and C96~C98 are electrically connected together; the excitation signal generation circuit is composed of an integrated circuit U29 , resistor RIN9 and R34, capacitor C 89, C92, C95, and CF9 are electrically connected together; the conductance one-step transmission circuit is composed of relays U23~U27, transistors N9~N13, diodes D9~D13, and resistors R28~R33; the temperature two-transmission isolation circuit It is composed of amplifier U33, signal isolator U32, resistors R35~R37, and capacitors C99~C108; the second temperature detection interface is composed of connector JT10; the conductance second measurement and AC to DC and isolation circuit are composed of amplifiers U34 and U37~U38 and U41, AC/DC signal converters U36 and U39, signal isolators U35 and U40, resistors R38~R42, and capacitors C109~C134 are jointly electrically connected; the second conductance detection interface is composed of connector JD11; the constant current signal second drive circuit is composed of Amplifier U47 and U49～U50, resistors RO14～RO18 and RA22～RA34, capacitors C135～C138 and C140～C141, C143～C144 and C146～C148 are electrically connected together; the excitation signal generation circuit is composed of integrated circuit U48, resistor RIN12 and R49, capacitors C139 and C142, C145 and CF12 are jointly electrically connected; conductance two-step transmission circuit is composed of relays U42~U46, transistors N14~N18, diodes D14~D18, resistors R43~R48 are electrically connected together; precision power supply circuit It consists of voltage regulators U51-U52, inductors L13-L16, and capacitors C149-C154 electrically connected together.

The AC220V total power input circuit is composed of connecting terminal AC14 and dual-stage filter U53, which are electrically connected together; the second on-chip system power circuit is composed of voltage stabilizer U55, isolated power supply module U56, capacitors CD14-CD15 and C155-C156. connection structure; the second on-chip system circuit is composed of integrated circuit U54, connector J14, P14~P15, and resistance R53; the reset and switch circuit is composed of buttons S14~S15, resistors R54~R57, capacitors C157~C158 Light-emitting diodes L17 are connected electrically; the total power control solid state relay circuit is composed of solid state relays U57~U58; the controlled power output circuit is composed of terminals AC15~AC18 connected electrically; the external switch power interface is composed of three external switches Composition of power supply; the digital power filter for the main board is composed of the common electrical connection of the filter U64 and the terminal DC15; the analog power filter for the main board is composed of the common electrical connection of the filter U65~U66 and the terminal DC16; the isolated digital power filter for the conductance It is composed of common electrical connection of filters U67~U68 and terminal DC17; the interface between the power supply board and the main board is composed of connector P16; the metering pump control solid state relay is composed of common electrical connection of solid state relays U59~U63; the metering pump output drive interface is composed of connectors Device QXCTLM15 composition.

Compared with the prior art, the present invention has the following advantages and beneficial effects:

1. Strong anti-interference ability. The power supply and metering pump drive board with large interference are separately manufactured, and a shielding box is added. The AC power supply is connected with a double-stage filter, and the DC switching power supply is connected with a DC filter and a large number of solid capacitors are used. Some places also use the second-level analog power supply to ensure the quality of DC power supply; the system is grounded through safety capacitors, which can effectively eliminate interference and ensure safety.

2. High measurement accuracy, using precision mechanical relay, its contact resistance is very small; the constant AC excitation circuit can effectively eliminate the influence of additional resistance caused by dirt on the electrode surface; the signal input adopts an instrument amplifier with high input impedance, which can not only eliminate dirt The influence of the additional resistance generated can greatly eliminate the common mode interference; the analog part adopts a high-frequency low-drift precision amplifier and a resistance with one-thousandth precision, thus ensuring the accuracy of the input transmission; the range is 1/2 gear There are common resistance slope correction and resistance zero point correction. In order to ensure the accuracy, the first and second ranges 3 have been specially treated; since the outer layer of the electrode is the signal ground, the signal is emitted from the middle electrode and enters the signal ground, so the excitation signal does not It will leak, so as to ensure that there is no interference between the two local conductivity signals.

3. Good compatibility and multiple functions. Through the use of industrial standard LCD touch screen for connection and communication, data display, input, alarm, curve recording, query, etc. become easy; the use of fault-tolerant CAN bus communication isolation drive module is convenient for communication with DCS or other systems communicate with CAN bus and corresponding protocols.

4. High working reliability, adopting comprehensive anti-interference technology and fault-tolerant technology, the fault only occurs in this module, and other non-faulty parts work as usual. For example, when the communication isolation drive module fails, the measurement part of the whole machine works as usual, while the measurement The electrode part is independent of each circuit, and is equipped with a protection circuit. The failure of some channels will not affect other channels; the average value of the upper alarm limit and the lower alarm limit is used as the control value to control the on/off value and make it not exceed the limit. , the control effect is good.

5. The operation is convenient, the internal monitoring is completed by technicians, and the external operation can be adjusted regularly by the workers. The operators can adjust the upper and lower limits of the conductivity alarm in time according to the process conditions, alarm signals and record curves and clean the electrodes regularly. .

6. High degree of intelligence, internal parameters have default values, which can be adjusted by technicians in the internal monitoring. There are multiple alarm functions, which are convenient to help judge the cause and location of the fault.

7. The circuit boards of the present invention can be connected with simple connectors or short cables, which are convenient for manufacture and maintenance, and low in cost. The aluminum chassis is adopted, and the heat dissipation conditions of the whole machine are good. The chassis is fully sealed, which can avoid the intrusion of dust and moisture. Industrial standard LCD touch screen, and using the configuration software equipped with the LCD touch screen, it can realize powerful functions, beautiful appearance, and convenient operation; anti-crash function, where the system program has a loop and may cause a crash, the internal counter is added, The over-range automatically jumps out, and the system design margin is relatively large, and it can work normally within the range of 220V±30%.

Description of drawings

Fig. 1 is a schematic diagram of the appearance and structure of the conductivity detection and control device in the aluminum profile passivation process of the present invention.

Fig. 2 is a schematic diagram of the main board circuit structure of the aluminum profile passivation process conductivity detection control device of the present invention.

Fig. 3 is a schematic diagram of the power supply and metering pump drive board circuit structure of the aluminum profile passivation process conductivity detection control device of the present invention.

Fig. 4 is a circuit schematic diagram of the first on-chip system in the motherboard circuit of the aluminum profile passivation process conductivity detection control device of the present invention.

5 is a schematic diagram of the power supply and reset circuit for the on-chip system in the motherboard circuit of the aluminum profile passivation process conductivity detection control device of the present invention.

Fig. 6 is a schematic diagram of the analog signal limiting protection circuit in the main board circuit of the aluminum profile passivation process conductivity detection control device of the present invention.

Fig. 7 is the digital power supply filter circuit for the mainboard, the safety capacitor one circuit, the analog power supply filter circuit for the mainboard, the power supply and the metering pump driver board interface in the mainboard circuit of the aluminum profile passivation process conductivity detection control device of the present invention, Schematic diagram of the isolated analog power supply filter circuit for conductance and the safety capacitor circuit.

8 is a schematic diagram of the internal operating circuit, the input/output communication interface circuit of the liquid crystal touch screen, and the communication interface circuit of the display panel in the main board circuit of the aluminum profile passivation process conductivity detection control device of the present invention.

9 is a schematic diagram of the CAN bus isolation driving circuit in the main board circuit of the aluminum profile passivation process conductivity detection control device of the present invention.

Fig. 10 is a schematic diagram of the switch output control circuit in the main board circuit of the conductivity detection control device for the aluminum profile passivation process of the present invention.

11 is a schematic diagram of the temperature-detection interface and the temperature-transmission isolation circuit in the main board circuit of the aluminum profile passivation process conductivity detection control device of the present invention.

Fig. 12 is a schematic diagram of conductance-measurement, AC to DC and isolation circuit, conductance-detection interface in the main board circuit of the aluminum profile passivation process conductivity detection control device of the present invention.

Fig. 13 is a schematic diagram of the conductance-skipping transmission circuit, constant current signal-drive circuit, and excitation signal-generating circuit in the main board circuit of the aluminum profile passivation process conductivity detection control device of the present invention.

14 is a schematic diagram of the second temperature detection interface and the second temperature transmission isolation circuit in the main board circuit of the aluminum profile passivation process conductivity detection control device of the present invention.

Fig. 15 is a schematic diagram of conductance two measurement, AC to DC and isolation circuit, and conductance two detection interface in the main board circuit of the aluminum profile passivation process conductivity detection control device of the present invention.

Fig. 16 is a schematic diagram of the conductance second jump gear transmission circuit, the constant current signal second drive circuit, and the excitation signal second generation circuit in the main board circuit of the aluminum profile passivation process conductivity detection control device of the present invention.

Fig. 17 is a schematic diagram of the precision power supply circuit in the motherboard circuit of the aluminum profile passivation process conductivity detection control device of the present invention.

Figure 18 shows the power supply of the aluminum profile passivation process conductivity detection control device of the present invention and the AC220V total power input circuit in the metering pump drive board circuit, the second on-chip system power supply circuit, the second on-chip system circuit, reset and switch Schematic diagram of machine circuit, total power control solid state relay circuit, controlled power output circuit.

Fig. 19 is the power supply of the aluminum profile passivation process conductivity detection control device of the present invention and the external switching power supply interface in the metering pump drive board circuit, the digital power filter for the main board, the analog power filter for the main board, and the isolated digital power supply for conductance Schematic diagram of filter, interface between power supply board and main board, metering pump control solid state relay, metering pump output drive interface.

Fig. 20 is a main program block diagram of the electrical conductivity detection and control device in the aluminum profile passivation process of the present invention.

Fig. 21 is a block diagram of the monitoring subroutine of the conductivity detection and control device in the aluminum profile passivation process of the present invention.

Fig. 22 is a block diagram of the timer interruption program of the conductivity detection control device in the aluminum profile passivation process of the present invention.

Fig. 23 is a program block diagram of the serial port receiving and sending interruption program of the aluminum profile passivation process conductivity detection control device of the present invention.

Fig. 24 is a block diagram of the CAN receiving interrupt program of the aluminum profile passivation process conductivity detection control device of the present invention.

detailed description

The present invention will be further described below in conjunction with specific examples.

As shown in Figure 1, the aluminum profile passivation process conductivity detection and control device described in this embodiment adopts a casing with a size of 290×250×450 mm, and a panel and a liquid crystal touch screen (standard industrial control) are installed in the casing , main board, power supply and metering pump drive board, four switching power supply modules, connecting cables, AC power filter, power input and output sockets, two-way conductivity electrode cable connectors, two-way temperature cable connectors, four-way metering pump drive output sockets , grounding terminal, CAN bus connection socket, wherein, the power supply and the metering pump driver board are separately equipped with a shielding box, the main board is separately equipped with a shielding white iron plate, the LCD touch screen is installed on the panel, and the main unit is connected to the main unit through a cable. The power supply of the board and the metering pump driver board interface 47 are connected with the power supply board of the metering pump driver board and the main board interface 75, thereby realizing the interconnection of the power supply and the switch signal between the two boards; on the panel, its power switch button Connect to the power supply and the button S14 on the metering pump driver board, its power indicator light is connected to the power supply and the light-emitting diode L17 on the metering pump driver board, and its reset button is connected to the button S1 on the main board; AC15~AC18 on the power supply and metering pump driver board Connect four switching power supply modules and power output, the power output supplies power for three CAN terminals.

The panel is provided with a power switch button 6, a power indicator light 7, and a reset button 16; the liquid crystal touch screen is equipped with a first conductivity display window 1, a second conductivity display window 2, and a third conductivity display window. Display window 3, fourth conductivity display window 4, fifth conductivity display window 5, first electrode setting button 8, second electrode setting button 9, real-time curve button 10, current alarm button 11, historical curve Button 12, CAN address display window 13, history alarm button 14, CAN communication status display window 15, fifth temperature display window 17, fourth temperature display window 18, third temperature display window 19, second temperature display Window 20, the first temperature display window 21, the fifth alarm display window 22, the fourth alarm display window 23, the third alarm display window 24, the second alarm display window 25, the first alarm display window 26 , The first manual on/off switching button 27, the second manual on/off switching button 28, the first automatic/manual switching button 29, the second automatic/manual switching button 30, the first pump switch indication display Window 31, the second pump switch indication display window 32, the third pump switch indication display window 33, the fourth pump switch indication display window 34, and the help button 35; the LCD touch screen is powered by an external DC24V, and the interface is through a short cable Connect to the corresponding point on the circuit board.

As shown in Figure 2, the circuit of described mainboard is by the first on-chip system circuit 36, mainboard digital power supply filter circuit 37, safety capacitor one circuit 38, mainboard analog power supply filter circuit 39, on-chip system power supply and Reset circuit 40, signal switching switch and analog signal limiting protection circuit 41, CAN bus isolation drive circuit 42, internal operation circuit 43, LCD touch screen input/output communication interface circuit 44, display panel communication interface circuit 45, switch output control circuit 46 , power supply and metering pump drive board interface 47, conductance isolation analog power supply filter circuit 48, safety capacitor 2 circuit 49, temperature-transmission isolation circuit 50, temperature-detection interface 51, conductance-measurement and AC to DC and isolation circuit 52. Conductance-detection interface 53, constant current signal-driving circuit 54, conductance-skipping transmission circuit 55, excitation signal-1 generating circuit 56, precision power supply circuit 57, excitation signal-2 generating circuit 58, constant-current signal-2 driving circuit 59. Conductance 2 jump gear transmission circuit 60, conductance 2 detection interface 61, conductance 2 measurement and AC to DC and isolation circuit 62, temperature 2 detection interface 63, temperature 2 transmission isolation circuit 64 are jointly electrically connected; among them, the power supply And the metering pump driver board interface 47 is respectively connected with corresponding points on the digital power filter circuit 37 for the main board, the analog power filter circuit 39 for the main board, and the isolated analog power filter circuit 48 for conductance through the power cord, thereby introducing power; the digital power supply for the main board The filter circuit 37 is respectively connected with the safety capacitor circuit 38, the CAN bus isolation drive circuit 42, the internal operation circuit 43, the LCD touch screen input/output communication interface circuit 44, the display panel communication interface circuit 45, the switch output control circuit 46, Corresponding points on the conductance one-step transmission circuit 55 and the conductance two-step transmission circuit 60 are connected; the power supply and reset circuit 40 of the on-chip system are respectively connected to the first on-chip system through the analog power line, the digital power line and the reset line. The circuit 36, the digital power filter circuit 37 for the main board, the analog power filter circuit 39 for the main board, the signal switching switch and the corresponding points on the analog signal limiting protection circuit 41 are connected to provide high-quality analog power and digital power for the system core; the first The on-chip system circuit 36 is connected to corresponding points on the internal operation circuit 43, the switch output control circuit 46, the conductance one-step transmission circuit 55, and the conductance two-step transmission circuit 60 respectively through switch lines; the first on-chip system circuit 36 are respectively connected with corresponding points on the CAN bus isolation drive circuit 42, the LCD touch screen input/output communication interface circuit 44, and the display panel communication interface circuit 45 through the communication line; the joint CAN5 on the CAN bus isolation drive circuit 42 is connected to the CAN bus, and the LCD JP4 on the touch screen input/output communication interface circuit 44 is connected to the liquid crystal touch screen; the signal switching switch and the analog signal limiting protection circuit 41 are respectively connected to the first on-chip system circuit 36, the temperature-transmission isolation circuit 50, and the conductance-one through the analog signal line. Measurement and AC to DC and isolation circuit 52, conductance 2 measurement and AC to DC and isolation circuit 62, temperature two transmission isolation circuit 64 are connected to corresponding points; conductance isolation analog power supply filter circuit 48 is respectively connected to safety capacitor two circuit 49, temperature one transmission isolation circuit 50, temperature 1 detection interface 51, conductance 1 measurement and AC to DC and isolation circuit 52, constant current signal 1 drive circuit 54, precision power supply circuit 57, constant current signal 2 drive circuit 59, conductance 2 measurement and AC to DC and isolation circuit 62, The temperature two detection interface 63 and the corresponding point on the temperature two transmission isolation circuit 64 are connected; the temperature one detection interface 51 is connected with the temperature one transmission isolation circuit 50 through the signal line, and the semiconductor temperature one sensor is connected externally; the conductance one detection interface 53 Respectively through the signal line and the conductance-measurement and the AC to DC and isolation circuit 52, the corresponding point on the constant current signal-drive circuit 54 is connected, and the conductance-sensor is connected externally; the constant-current signal-drive circuit 54 also passes the signal line and the conductance- The jump gear transmission circuit 55 and the corresponding points on the second excitation signal generation circuit 58 are connected; the precision power supply circuit 57 is respectively connected to the corresponding points on the first excitation signal generation circuit 56 and the second excitation signal generation circuit 58 by power lines; the second temperature detection The interface 63 is connected with the second temperature transmission isolation circuit 64 through the signal line, and the second semiconductor temperature sensor is connected externally; the second conductance detection interface 61 is respectively driven by the signal line and the second conductance measurement, AC to DC and isolation circuit 62, and the second constant current signal Corresponding points on the circuit 59 are connected, and the second conductance sensor is connected externally; the constant current signal second driving circuit 59 is also connected to corresponding points on the second excitation signal generation circuit 58 and the second conductance jump transmission circuit 60 through signal lines.

As shown in Figure 3, the power supply and the metering pump drive board are composed of AC220V total power input circuit 65, second on-chip system power circuit 66, second on-chip system circuit 67, reset and switch circuit 68, and total power control solid-state relay circuit 69. Controlled power supply output circuit 70, external switching power supply interface 71, digital power filter for main board 72, analog power filter for main board 73, isolated digital power filter for conductance 74, interface between power board and main board 75, metering pump The control solid state relay 76 and the metering pump output drive interface 77 are jointly electrically connected; wherein, the AC220V total power input circuit 65 is respectively connected to the corresponding points on the second on-chip system power circuit 66 and the total power control solid state relay circuit 69 through the power line , an external AC220V power supply; the second on-chip system circuit 67 is connected to the corresponding points on the second on-chip system power circuit 66, reset and switch machine circuit 68, and the total power control solid state relay circuit 69 respectively through the power line, reset line, and switch line Connect; Controlled power supply output circuit 70 is connected with total power supply control solid state relay circuit 69, the corresponding point on the external switching power supply interface 71 respectively by power line; Corresponding points on the analog power filter 73 for the mainboard and the isolated digital power filter 74 for conductance are connected, and three switching power supplies are connected externally; Connect with analog power supply filter 73, conductance isolation digital power supply filter 74, metering pump control solid state relay 76 corresponding points, and external main board; metering pump output drive interface 77 is connected with metering pump control solid state relay 76 corresponding point through power line Phase connection, four external switches to control the metering pump.

The motherboard circuit is automatically wired by the computer, and the computers with the same network label will be automatically connected together. As shown in Figure 4, in the motherboard circuit, the first on-chip system circuit 36 is composed of an integrated circuit U1, a crystal oscillator U2, and a connector J1 , resistor R1, and capacitors C1 to C22 are electrically connected together; as shown in Figure 5, the on-chip system power supply and reset circuit 40 is composed of voltage regulators U3 and U4, connector J2, diodes D1 to D4 and D6 to D7, light emitting Diode D5 and D8, resistors R2-R5, capacitors C23-C29, and button S1 are electrically connected together; Voltage regulator chip U7, limiter protection chip U8, resistors RX2-RX13 and R6, capacitors C30-C37 and CX2, and light-emitting diode L2 are jointly electrically connected; RL3 and capacitor C38 are jointly electrically connected; safety capacitor 1 circuit 38 is composed of magnetic beads RL4, resistor R7, and safety capacitor C39; analog power supply filter circuit 39 for the motherboard is composed of magnetic beads RL5-RL7 and capacitors C40-C41 Composed of common electrical connections; power supply and metering pump drive board interface 47 is composed of connector P3; conductance isolated analog power supply filter circuit 48 is composed of magnetic beads RL8 ~ RL10, capacitors C42 ~ C43 common electrical connection; safety capacitor second circuit 49 is composed of Magnetic bead RL11, resistor R8, and safety capacitor C44 are electrically connected together; as shown in Figure 8, the internal operation circuit 43 is composed of a dial switch NBJ4 and a resistor R15 electrically connected together; the LCD touch screen input/output communication interface circuit 44 is composed of Integrated circuit U9, magnetic beads RL12, connectors P5 and JP4, resistors R9-R10 and R13-R14, and capacitor C46 are electrically connected together; display board communication interface circuit 45 is composed of connector P4, resistors R11-R12, and capacitor C45. Connection composition; As shown in Figure 9, the CAN bus isolation drive circuit 42 is composed of integrated circuit U10, connector CAN5, resistors R16-R17, and capacitor C47, which are electrically connected together; as shown in Figure 10, the switch output control circuit 46 is composed of an isolated power supply Module U11, optocoupler U12, inductors L6-L8, resistors R18-R19 and RX14, and capacitors C48-C50 are electrically connected together; as shown in Figure 11, the temperature-transmission isolation circuit 50 is composed of amplifier U14, signal isolator U13, Resistors R20-R22 and capacitors C51-C60 are jointly electrically connected; temperature-detection interface 51 is composed of connector JT7; U22, AC-DC signal converters U17 and U20, signal isolators U15 and U21, resistors R23~R27, capacitors C61~C84 are jointly electrically connected; conductance-detection connection Port 53 is made up of connector JD8; As shown in Figure 13, constant current signal-drive circuit 54 is made up of amplifier U28 and U30～U31, resistance RO9～RO13 and RA9～RA21, electric capacity C85～C88 and C90～C91 and C93～C94 and C96～C98 are jointly electrically connected; the excitation signal generation circuit 56 is composed of integrated circuit U29, resistors RIN9 and R34, capacitors C89 and C92, and C95 and CF9 are jointly electrically connected; U27, transistors N9-N13, diodes D9-D13, and resistors R28-R33 are electrically connected together; as shown in Figure 14, the second temperature transmission isolation circuit 64 is composed of amplifier U33, signal isolator U32, resistors R35-R37, and capacitor C99 ～C108 common electrical connections; temperature 2 detection interface 63 is composed of connector JT10; as shown in Figure 15, conductance 2 measurement and AC to DC and isolation circuit 62 is composed of amplifier U34, U37～U38 and U41, AC-DC signal converter U36 and U39, signal isolators U35 and U40, resistors R38-R42, and capacitors C109-C134 are jointly electrically connected; the conductance second detection interface 61 is composed of connector JD11; as shown in Figure 16, the constant current signal second drive circuit 59 is composed of Amplifier U47 and U49～U50, resistors RO14～RO18 and RA22～RA34, capacitors C135～C138 and C140～C141, C143～C144 and C146～C148 are electrically connected together; the excitation signal generation circuit 58 is composed of integrated circuit U48 and resistor RIN12 and R49, capacitors C139 and C142, C145 and CF12 are jointly electrically connected; conductance two-step transmission circuit 60 is composed of relays U42～U46, transistors N14～N18, diodes D14～D18, and resistors R43～R48 are electrically connected together; As shown in FIG. 17 , the precision power supply circuit 57 is composed of voltage regulators U51 - U52 , inductors L13 - L16 , and capacitors C149 - C154 electrically connected together.

The computer system power supply and the metering pump drive board, the computer with the same network label will be automatically connected together, as shown in Figure 18, the AC220V total power supply input circuit 65 is formed by the common electrical connection of the terminal AC14 and the two-stage filter U53; the second in The on-chip system power supply circuit 66 is composed of voltage regulator U55, isolated power supply module U56, capacitors CD14-CD15 and C155-C156 electrically connected together; the second on-chip system circuit 67 is composed of integrated circuit U54, connector J14 and P14-P15, row Resistor R53 is jointly electrically connected; reset and switch circuit 68 is composed of buttons S14-S15, resistors R54-R57, capacitors C157-C158, and light-emitting diode L17; total power control solid-state relay circuit 69 is composed of solid-state relays U57-U58 common electrical connection; the controlled power supply output circuit 70 is formed by the common electrical connection of terminals AC15-AC18; as shown in Figure 19, the external switching power supply interface 71 is composed of three external switching power supplies; the digital power supply filter 72 for the motherboard is composed of filter U64 and terminal DC15 are electrically connected together; the mainboard analog power filter 73 is composed of filters U65~U66 and terminal DC16; the isolated digital power filter 74 for conductance is composed of filters U67~U68 and terminal The common electrical connection of DC17 is formed; the interface 75 between the power supply board and the main board is composed of connector P16; the metering pump control solid state relay 76 is composed of common electrical connection of solid state relays U59~U63; the metering pump output drive interface 77 is composed of connector QXCTLM15.

Among them, U1 can choose C8051F060, U3, U4, U7, U55 can choose AMS1117, UK2 can choose DG403, U5 can choose TLE2024, U6 can choose TLV2454, U8 can choose TL7726, U9 can choose MAX490CSA, U10 can choose CTM1054; U11 can choose Choose B0505LS, U12 can choose TLP521-4, U14, U19, U33, U38 can choose INA128, U13, U32 can choose ISO124; U16, U18, U22, U34, U37, U41 can choose INA111 or INA121, U17, U20, U36 can choose , U39 can choose AD536, U15, U21, U35, U40 can choose T6650D; U29, U48 can choose MAX038, U28, U47 can choose LM7171, U30, U49 can choose LM6172, U31, U50 can choose OPA627, U23～U27 and U42 ~U46 can choose CTX-5V, U51 and U52 can choose K7805, U54 can choose C8051F330, U53 can choose CW4L2-10A-T, U56 can choose AC/DC3W5V, U57 and U58 can choose GTJ2-8A, U59～U63 can choose GTJ24-3A, U64~U68 can choose FT110PD-3, LCD touch screen can choose SUKON-07L.

The working principle of the present invention is as follows:

1) The temperature millivolt signal is generated by the semiconductor temperature sensor attached to the electrode, and the millivolt signal is connected to the main board through the cable connector;

2) The generation process of the conductance millivolt signal is as follows: firstly, the excitation signal generation circuit is controlled to generate a sinusoidal signal with a certain frequency and fixed amplitude, and the signal is connected to the constant current signal driving circuit. A certain driving constant current, this constant current is used to drive the conductance electrode after DC blocking treatment, the constant current flows through the standard resistance and the detection cell at the same time and generates an AC signal with a corresponding amplitude, the greater the resistance of the conductance cell, the greater the voltage generated , and then the two AC signals respectively enter the AC/DC RMS converter and generate corresponding DC voltages, and then send them to the host after being isolated by the signal switching switch and the analog signal limiting protection circuit;

3) The temperature signals generated respectively through the above process enter the 12-bit A/D converter; the four-way conductance signal is sent to the two-way 16-bit precision A/D converter port through the switching of the DC electronic switch, and the reference signal of the same way and The detection signal enters the same channel, which can eliminate the channel error; the resistance at both ends of the measuring cell can be obtained through the simple calculation of the single-chip microcomputer. After the resistance is linearly corrected, the accurate resistance value is obtained. The standard conductivity value is obtained after the electrode conductivity constant and temperature compensation;

4) After the processed signals are coded and packaged by the first on-chip system, they are sent to the LCD touch screen in the form of communication interruption to display the corresponding data;

5) After encoding, all button signals on the LCD touch screen are sent to the first on-chip system in the form of communication interruption, and corresponding operations are performed;

6) The CAN host sends a timer synchronization signal every 0.5 seconds, and the CAN terminal interrupts receiving the synchronization signal, and arranges the time period for sending data according to the size of the address code to ensure the smooth flow of the data channel. The signal sent by the CAN terminal has conductivity, Temperature, metering pump switch signal, alarm signal;

7) All host programs and fixed parameters are stored in the on-chip EEPROM of the first on-chip system, and the calculation variables are temporarily stored in the RAM in the first on-chip system;

8) The control of the local two-way conductivity is that when the conductivity exceeds the upper and lower limits, an alarm is generated, and the median value between the upper and lower limits of the first on-chip system is used as the control value, and the switch of the pump is generated according to the positive and negative effects. Output, at the same time, together with the switch signal and alarm signal sent by the terminal, generate the drive output of the four-way metering pump and display the alarm prompt;

9) When the system needs to adjust the internal monitoring parameters, press the electrode setting button, the screen is equipped with multiple display windows, which are conductance millivolt indication window, reference millivolt indication window, terminal resistance value indication window, standard conductivity indication Window, temperature value indication window, conductivity range indication window, range automatic/manual indication window; the touch screen is equipped with an input keyboard and limits the data, and the data input is realized by pressing the keyboard respectively. They are respectively, the electrode constant button , temperature compensation coefficient button, temperature slope button, temperature zero button, resistance slope 12 button, resistance zero point 12 button, one/two range 3 calibration screen button, conductivity zero button, alarm upper limit button, alarm lower limit button, lag time button, positive and negative action button, range increase button, range decrease, return to main screen button, send HMI data into MCU button, the setting interface of one/two electrodes is the same; all input data are equipped with power-down protection processing, note that only Press the button to send HMI data into the MCU to send the data into the MCU; in order to ensure the accuracy of the measurement, the 1/2 gear of the range is equipped with a common resistance slope correction and resistance zero point correction; a special treatment is made for the range 3, and the range 3 is selected The voltage value at the resistance 500, 600, 700, 800, 900, 1000, 2000, 3000, 4000, 5000 ohms is used as the basis for linear look-up table interpolation.

The technical indicators and parameters of the embodiments of the present invention are as follows: (1) input voltage: AC220V ± 30%, 50Hz; (2) average power: 70W; (3) conductivity one/two-way detection range: 200μS～200mS; ( 4) Liquid temperature one/two circuit: 0～99.9℃; (5) One/two circuit switch control mode: automatic or manual; (6) Conductivity one/two online detection point accuracy: ≤1% (in a wide range) ; (7) The maximum detection lag time of jump gear: ≤ 2 seconds; (8) In addition, three CAN terminals are connected; (9) Five-way display alarm and four-way switch control are realized.

When the present invention is in use, it is first connected with AC 220V voltage, externally connected switching power supply, conductance one/two electrodes (each with a semiconductor temperature sensor), dosing pump one/two/three/four, three-way CAN terminal and its power supply, The specific working steps during detection are: (1) turn on the power; (2) adjust the internal memory parameters; after that, the operator can adjust the conductivity upper/lower limit alarm value on the LCD touch screen in time according to the process conditions, alarm signal and record curve. Yes, and conduct regular cleaning and zero calibration of the conductivity electrode.

The main program of the present invention is shown in Figure 20, and the measurement monitoring processing subroutine is shown in Figure 21. When using for the first time: set the dial switch NBJ4 to the hidden parameter, start the machine, so that the first on-chip system sends the original standard parameters to the RAM; Then dial back the code to the memory parameter position to complete the normal startup; after that, press the electrode 1 setting button on the LCD touch screen, and input parameters through the built-in keyboard, they are: electrode constant button, temperature compensation coefficient button, temperature slope button, temperature Zero point button, resistance slope 12 button, resistance zero point 12 button, one/two-way range 3 calibration screen, conductivity zero button, alarm upper limit button, alarm lower limit button, lag time button, positive and negative action button, return to main screen button, Send HMI data into the MCU button; the operation of the electrode 2 setting button is the same as above; after the parameter setting is completed, be sure to press the send HMI data into the MCU button, so that the MCU can receive the corresponding data and save the data in the internal EEPROM , so that the memory parameter will be automatically transferred when the machine is turned on next time. At the same time, the LCD screen also regularly refreshes the data sent by the microcontroller, which are: conductance millivolt indication window, reference millivolt indication window, terminal resistance value indication window, standard conductivity indication window, temperature indication window, conductance range indication window, Automatic and manual indication windows for the range, the same operation interface for the first and second channels; use the built-in functions of the LCD touch screen to draw real-time curves and historical curves, and can display real-time alarms and historical alarms. The temperature channel can be linearly corrected through the slope and zero point; the conductance range 1/2 only needs to be linearly corrected by the resistance slope 12 and the resistance zero point 12, and the conductance range 3 needs to enter another screen and record the voltage value under each standard resistance , the correction process requires the use of an AC resistance box; the system uses a 25 millisecond interrupt timer, as shown in Figure 22, to manage the internal program operation and send CAN synchronization timing data every 0.5 seconds; the serial data of the host and LCD touch screen, etc. The exchange is all performed by interrupts, as shown in Figure 23, the data sent and received enters the ring buffer first, and then the buffer is processed by the program; the data sent by the three CAN terminals is also interrupted by the host Immediately process, see Figure 24; the adjustment of the electrode constant requires standard KCL buffer solution, and the adjustment of the temperature value requires a thermometer; at this point, the adjustment of the whole machine is completed; the external operation can be adjusted regularly and appropriately by workers.

To sum up, this device, together with the seven-electrode or four-electrode sensor, can directly realize the detection and control of the two-way conductivity, and connect three single-way seven-electrode conductivity detection monitors externally through the CAN bus to realize blunt detection of aluminum profiles. Pre-degreasing conductivity detection and dosing control in chemical process, degreasing conductivity detection and dosing control, primary cleaning conductivity detection and water change control, passivation process conductivity detection and dosing control, secondary washing conductivity detection and alarm , that is, five-way conductivity detection plus four-way control; the self-contained two-way conductivity detection of this device is equipped with 3 ranges, the measurement range is 200uS/cm～200mS/cm, and it is equipped with conductivity electrodes with different electrode constants. can be further expanded. The first and second channels of the device independently adopt step-by-step precision AC constant current excitation and independent measurement, and the control effect is good; because the industrial standard LCD touch screen is used, the configuration software equipped with the screen cooperates with the single-chip software for data communication, which is easy to realize For data input and output, the system is equipped with the first electrode setting screen, the second electrode setting screen, real-time curve recording, historical curve query, current alarm display, and historical alarm display. In addition, the first and second channels also have manual/ Automatic control switching, manual on/off pump switching; instruct CAN communication, system alarm display for five-way conductivity signals, enter the document display page through the help button, and view the help document. The system is equipped with a CAN module to facilitate networking with other systems; due to the adoption of many new technologies, the present invention has many advantages, such as low manufacturing cost, simple process, high measurement accuracy, strong anti-interference ability, multiple functions, convenient maintenance, etc., can be It is widely used in the detection and control process of on-line conductivity in the industrial field, and it is worth popularizing.

The implementation examples described above are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Therefore, all changes made according to the shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims (6)

1. An aluminum profile passivation process conductivity detection and control device, characterized in that: it includes an organic casing and a panel, a liquid crystal touch screen, a main board, a power supply and a metering pump drive board, and four switches respectively installed in the casing Power module, cable, AC power filter, power input and output socket, two-way conductivity electrode cable connector, two-way temperature cable connector, four-way metering pump drive output socket, ground terminal, CAN bus connection socket, wherein the power supply and The metering pump drive board is separately installed with a shielding box, the main board is separately installed with a shielding white iron plate, the LCD touch screen is installed on the panel, and the power supply of the main board and the interface of the metering pump drive board are connected to the power supply and the metering pump through the cable. The power board of the board is connected with the main board interface, so as to realize the interconnection of the power supply and the switch signal between the two boards; on the panel, the power switch button is connected to the power supply and the button S14 on the metering pump drive board, and the power indicator is connected The LED L17 on the power supply and metering pump driver board, its reset button is connected to the button S1 on the main board; AC15~AC18 on the power supply and metering pump driver board are connected to four switching power supply modules and power output, the power output is three CAN Terminal power supply. 2. A conductivity detection and control device for aluminum profile passivation process according to claim 1, characterized in that: the panel is provided with a power switch button, a power indicator light, and a reset button; the LCD touch screen is equipped with The first conductivity display window, the second conductivity display window, the third conductivity display window, the fourth conductivity display window, the fifth conductivity display window, the first electrode setting button, the second electrode Setting button, real-time curve button, current alarm button, historical curve button, CAN address display window, historical alarm button, CAN communication status display window, fifth channel temperature display window, fourth channel temperature display window, third channel temperature display window, the second temperature display window, the first temperature display window, the fifth alarm display window, the fourth alarm display window, the third alarm display window, the second alarm display window, the first alarm display window , the first manual on/off switching button, the second manual on/off switching button, the first automatic/manual switching button, the second automatic/manual switching button, the first pump switch indication window, the second 1st pump switch indicator display window, 3rd pump switch indicator display window, 4th pump switch indicator display window, help button; the LCD touch screen is powered by an external DC24V, and the interface is connected to the corresponding point on the circuit board through a short cable . 3. A conductivity detection and control device for aluminum profile passivation process according to claim 1, characterized in that: the circuit of the main board is composed of a first on-chip system circuit, a digital power supply filter circuit for the main board, and a safety capacitor One circuit, analog power supply filter circuit for main board, power supply and reset circuit for on-chip system, signal switching switch and analog signal limiting protection circuit, CAN bus isolation drive circuit, internal operation circuit, LCD touch screen input/output communication interface circuit, display Board communication interface circuit, switch output control circuit, power supply and metering pump drive board interface, conductance isolated analog power supply filter circuit, safety capacitor two circuit, temperature-transmission isolation circuit, temperature-detection interface, conductance-measurement and AC conversion DC and isolation circuit, conductance-detection interface, constant-current signal-drive circuit, conductance-shift transmission circuit, excitation signal-generating circuit, precision power supply circuit, excitation signal-2 generating circuit, constant-current signal-2 driving circuit, conductance-2 Skipping transmission circuit, conductance 2 detection interface, conductance 2 measurement and AC to DC and isolation circuit, temperature 2 detection interface, temperature 2 transmission isolation circuit are jointly electrically connected; among them, the interface of power supply and metering pump drive board is connected through the power cord Connect with the corresponding points on the digital power filter circuit for the main board, the analog power filter circuit for the main board, and the isolated analog power filter circuit for conductance, so as to introduce power; CAN bus isolation drive circuit, internal operation circuit, LCD touch screen input/output communication interface circuit, display panel communication interface circuit, switch output control circuit, conductance one-step transmission circuit, conductance two-step transmission circuit are connected to corresponding points The power supply and reset circuit for the on-chip system are respectively connected with the first on-chip system circuit, the digital power supply filter circuit for the main board, the analog power supply filter circuit for the main board, the signal switching switch and the analog signal limiter through the analog power line, the digital power line and the reset line The corresponding points on the width protection circuit are connected to provide high-quality analog power and digital power for the core of the system; the first on-chip system circuit is connected to the internal operating circuit, switch output control circuit, conductance one-step transmission circuit, and conductance through the switch line. The corresponding points on the second jump gear transmission circuit are connected; the first on-chip system circuit is respectively connected to the corresponding points on the CAN bus isolation drive circuit, the LCD touch screen input/output communication interface circuit, and the display panel communication interface circuit through the communication line; CAN The connector CAN5 on the bus isolation drive circuit is externally connected to the CAN bus, and the JP4 on the LCD touch screen input/output communication interface circuit is connected to the LCD touch screen; the signal switching switch and the analog signal limiting protection circuit are respectively connected to the first on-chip system circuit, Temperature-transmission isolation circuit, conductance-1 measurement and AC-to-DC and isolation circuit, conductance-2 measurement and AC-to-DC and isolation circuit, and temperature-2 transmission isolation circuit are connected to corresponding points; conductance uses isolated analog power filter circuit through power supply Lines are respectively connected with the second safety capacitor circuit, the temperature-transmission isolation circuit, the temperature-detection interface, the conductance-measurement and the AC to DC and isolation circuit, and the constant Flow signal first drive circuit, precision power supply circuit, constant current signal two drive circuit, conductance two measurement and AC to DC and isolation circuit, temperature two detection interface, temperature two transmission isolation circuit are connected to the corresponding points; temperature one detection interface through The signal line is connected to the temperature-transmission isolation circuit, and the semiconductor temperature-sensor is connected externally; the conductance-detection interface is respectively connected to the corresponding points on the conductance-measurement, AC to DC and isolation circuit, and constant current signal-drive circuit through the signal line , the external conductance sensor is connected; the constant current signal one driving circuit is also connected to the corresponding point on the conductance one jump gear transmission circuit and the excitation signal two generating circuit through the signal line; the precision power circuit is respectively connected to the excitation signal one generating circuit through the power line , The corresponding points on the excitation signal generation circuit are connected; the temperature detection interface is connected to the temperature transmission isolation circuit through the signal line, and the semiconductor temperature sensor is connected externally; the conductance detection interface is respectively connected to the conductance measurement and exchange through the signal line The DC conversion and isolation circuit, and the corresponding points on the second driving circuit of the constant current signal are connected to each other, and the second sensor of the conductance is connected externally; The points are connected. 4. A conductivity detection and control device for aluminum profile passivation process according to claim 1, characterized in that: said power supply and metering pump drive board are composed of AC220V main power input circuit, second on-chip system power circuit, second Two on-chip system circuit, reset and switch machine circuit, total power control solid state relay circuit, controlled power output circuit, external switching power supply interface, digital power filter for main board, analog power filter for main board, isolated digital power filter for conductance device, power board and main board interface, metering pump control solid state relay, and metering pump output drive interface are electrically connected together; among them, the AC220V main power input circuit is respectively connected to the second on-chip system power circuit and the main power control solid state relay through the power line The corresponding points on the circuit are connected, and the external AC220V power supply is connected; the second on-chip system circuit is respectively connected to the second on-chip system power circuit, reset and switch circuit, and the total power control solid-state relay circuit through the power line, reset line, and switch line. The output circuit of the controlled power supply is connected to the corresponding points on the main power control solid state relay circuit and the interface of the external switching power supply through the power line; the interface of the external switching power supply is respectively connected to the digital power filter for the main board and the analog The corresponding points on the power supply filter and the isolated digital power filter for conductance are connected, and three switching power supplies are connected externally; Connect the corresponding points of the isolated digital power filter and the metering pump control solid-state relay, and externally connect the motherboard; the metering pump output drive interface is connected with the corresponding point on the metering pump control solid-state relay through the power line, and four external switches are connected to control the metering pump. 5. A conductivity detection and control device for aluminum profile passivation process according to claim 3, characterized in that: said first on-chip system circuit consists of integrated circuit U1, crystal oscillator U2, connector J1, resistor R1, capacitor C1～C22 common electrical connection structure; on-chip system power supply and reset circuit consists of voltage regulator U3 and U4, connector J2, diodes D1～D4 and D6～D7, light emitting diodes D5 and D8, resistors R2～R5, capacitor C23 ～C29 and button S1 are electrically connected together; the signal switching switch and the analog signal limiter protection circuit are composed of electronic switch UK2, amplifiers U5 and U6, voltage regulator chip U7, limiter protection chip U8, resistors RX2-RX13 and R6, Capacitors C30-C37, CX2, and light-emitting diode L2 are jointly electrically connected; the digital power supply filter circuit for the motherboard is composed of magnetic beads RL3 and capacitor C38; the safety capacitor circuit is composed of magnetic beads RL4, resistor R7, and safety capacitor C39 Composed of common electrical connections; the analog power supply filter circuit for the main board is composed of magnetic beads RL5~RL7 and capacitors C40~C41; the interface of the power supply and metering pump driver board is composed of connector P3; RL8～RL10, capacitors C42～C43 are electrically connected together; the second safety capacitor circuit is composed of magnetic beads RL11, resistor R8, and safety capacitor C44; the internal operation circuit is electrically connected by dial switch NBJ4 and resistance R15 Composition; LCD touch screen input/output communication interface circuit is composed of integrated circuit U9, magnetic beads RL12, connectors P5 and JP4, resistors R9~R10 and R13~R14, capacitor C46 are electrically connected together; display panel communication interface circuit is composed of connector P4 , resistors R11~R12, and capacitor C45 are electrically connected together; the CAN bus isolation drive circuit is composed of integrated circuit U10, connector CAN5, resistors R16~R17, and capacitor C47; the switch output control circuit is composed of isolated power supply module U11, optical Coupling U12, inductors L6~L8, resistors R18~R19 and RX14, capacitors C48~C50 are electrically connected; the temperature-transmitting isolation circuit is composed of amplifier U14, signal isolator U13, resistors R20~R22, capacitors C51~C60 Connection structure; temperature-detection interface is composed of connector JT7; conductance-measurement and AC to DC and isolation circuit is composed of amplifiers U16, U18~U19 and U22, AC and DC signal converters U17 and U20, signal isolators U15 and U21, resistors R23～R27, capacitors C61～C84 are jointly electrically connected; conductance-detection interface is composed of connector JD8; constant current signal-drive circuit is composed of amplifier U28 and U30～U31, resistors RO9～RO13 and RA9～RA21, capacitors C85～C88 And C90～C91 and C93～C94 and C96～C98 common electrical Connection structure; the excitation signal generation circuit is composed of integrated circuit U29, resistors RIN9 and R34, capacitors C89 and C92, C95 and CF9 are electrically connected; the conductance one-step transmission circuit is composed of relays U23~U27, transistors N9~N13, diodes D9～D13, resistors R28～R33 are electrically connected together; the temperature two transmission isolation circuit is composed of amplifier U33, signal isolator U32, resistors R35～R37, capacitors C99～C108 are electrically connected; the temperature two detection interface is connected by connector JT10 Composition; conductance two measurement and AC to DC and isolation circuits are electrically connected by amplifiers U34, U37~U38 and U41, AC/DC signal converters U36 and U39, signal isolators U35 and U40, resistors R38~R42, and capacitors C109~C134 Composition; conductance two detection interface is composed of connector JD11; constant current signal two driving circuit is composed of amplifier U47 and U49~U50, resistor RO14~RO18 and RA22~RA34, capacitor C135~C138 and C140~C141 and C143~C144 and C146~ C148 common electrical connection; excitation signal second generation circuit is composed of integrated circuit U48, resistors RIN12 and R49, capacitors C139 and C142 and C145 and CF12 common electrical connection; conductance second jump transmission circuit is composed of relays U42~U46, transistors N14~ N18, diodes D14-D18, and resistors R43-R48 are jointly electrically connected; the precision power supply circuit is composed of voltage regulators U51-U52, inductors L13-L16, and capacitors C149-C154. 6. A conductivity detection and control device for aluminum profile passivation process according to claim 4, characterized in that: said AC220V total power supply input circuit is composed of connecting terminal AC14 and dual-stage filter U53 electrically connected together; the second The power supply circuit of the on-chip system is composed of voltage stabilizer U55, isolated power supply module U56, capacitors CD14~CD15 and C155~C156 electrically connected together; the second on-chip system circuit is composed of integrated circuit U54, connector J14 and P14~P15, resistance R53 common electrical connection; reset and switch machine circuit is composed of buttons S14~S15, resistors R54~R57, capacitors C157~C158, light emitting diode L17 common electrical connection; total power control solid state relay circuit is composed of solid state relay U57~U58 common electrical connection ;The output circuit of the controlled power supply is composed of the common electrical connection of the terminals AC15~AC18; the external switching power supply interface is composed of three external switching power supplies; the digital power filter for the main board is composed of the common electrical connection of the filter U64 and the terminal DC15; The analog power filter is composed of filters U65~U66 and terminal DC16, which are electrically connected together; the isolated digital power filter for conductance is composed of filters U67~U68, and terminal DC17, which are electrically connected together; the interface between the power board and the main board is connected by a connector Composed of P16; metering pump control solid state relay is composed of solid state relay U59 ~ U63 common electrical connection; metering pump output drive interface is composed of connector QXCTLM15.