Aluminum electrolysis multifunctional unit acquisition device

Abstract

The utility model discloses an aluminum electrolysis multifunctional unit acquisition device which comprises a microcontroller circuit 1, an x-axis magnetic field detection circuit 2, a y-axis magnetic field detection circuit 3, a z-axis magnetic field detection circuit 4, a voltage detection circuit 5, a current detection circuit 6, an Ethernet communication circuit 7 and an industrial serial port touch screen circuit 8. The x-axis magnetic field intensity, the y-axis magnetic field intensity, the z-axis magnetic field intensity, the input voltage value and the input current value are monitored in real time through the microcontroller, displayed on the industrial serial port touch screen circuit 7 in real time and uploaded to a server through the Ethernet communication circuit 8. Voltage, current and three-axis magnetic fields (an x-axis magnetic field, a y-axis magnetic field and a z-axis magnetic field) of an aluminum electrolysis multifunctional unit, a main working motor and other equipment can be collected in real time, and monitored data are uploaded and used for real-time monitoring and subsequent analysis and diagnosis of fault causes such as rail gnawing of motors, bearings and wheels under the high-intensity magnetic field.

Description

Technical Field

[0001] This utility model relates to the field of electronic technology for data acquisition devices in multifunctional aluminum electrolysis units. Background Technology

[0002] The aluminum electrolysis multi-functional unit is an important mechanized operating device in the electrolysis workshop of aluminum electrolysis enterprises. It is a special type of bridge-type lifting equipment that can perform tasks such as shell breaking, electrode replacement, replenishing covering material, slag removal, liquid discharge, lifting the anode busbar, hoisting the upper and lower structures of the electrolysis cell, and other miscellaneous operations in the prebaked anode electrolysis cell. During operation, it is necessary to monitor the input voltage and current of the aluminum electrolysis multi-functional unit in real time, as well as the operating voltage and current of the main motors. This is used for fault analysis of the aluminum electrolysis multi-functional unit and its motors. Typically, a solution is used to add analog input modules to the PLC used for controlling the aluminum electrolysis multi-functional unit, along with corresponding voltage and current sensors, for voltage and current monitoring. However, these solutions do not... Considering the damage to the lifespan of the strong magnetic field environment during the operation of the aluminum electrolysis multi-functional unit, magnetic field strength monitoring is needed. During aluminum electrolysis, the busbar in the electrolysis workshop generates a magnetic field as high as 1000 Gauss, placing the aluminum electrolysis multi-functional unit in a strong magnetic field environment of up to 500 Gauss. This can subject the unit to forces as high as 400kN, leading to increased load, wheel wear due to biased forces, uneven bearing wear, increased motor starting current, and current arcing caused by bearings cutting magnetic lines of force. This results in increased bearing and motor failures and shortened lifespan. Therefore, a data acquisition device capable of real-time monitoring of the magnetic field strength in multiple locations and directions within the aluminum electrolysis multi-functional unit is required. Utility Model Content

[0003] The technical problem to be solved by this utility model is a data acquisition device for a multi-functional aluminum electrolysis unit, which can collect the voltage, current and three-axis magnetic field (x-axis magnetic field, y-axis magnetic field and z-axis magnetic field) of the multi-functional aluminum electrolysis unit and the main working motor in real time, and upload the monitored data for real-time monitoring and subsequent analysis and diagnosis of faults such as motor, bearing and wheel wear under strong magnetic field.

[0004] The technical solution of this utility model is: a data acquisition device for a multifunctional aluminum electrolysis unit, including a microcontroller circuit, an x-axis magnetic field detection circuit, a y-axis magnetic field detection circuit, a z-axis magnetic field detection circuit, a voltage detection circuit, a current detection circuit, an Ethernet communication circuit, and an industrial serial port touch screen circuit; the microcontroller monitors the x-axis magnetic field strength, y-axis magnetic field strength, z-axis magnetic field strength, input voltage value, and input current value in real time, displays them in real time on the industrial serial port touch screen circuit, and uploads them to the server via the Ethernet communication circuit.

[0005] The microcontroller circuit consists of a microcontroller. The power input terminal VDD of the microcontroller is connected to the first power supply V1, and the power ground VSS of the microcontroller is connected to the common ground.

[0006] The x-axis magnetic field detection circuit consists of a first magnetic field detection chip, a first operational amplifier, a second operational amplifier, a first resistor, and a second resistor. The power input terminal VCC of the first magnetic field detection chip is connected to the first power supply V1, the power ground GND is connected to the common ground, and the signal output terminal VOUT is connected to the non-inverting input terminal IN+ of the first operational amplifier. The first operational amplifier is configured as a voltage follower, with its inverting input terminal IN- connected to its output terminal OUT, and its output terminal OUT connected to the non-inverting input terminal IN+ of the second operational amplifier. The second operational amplifier is configured as a non-inverting proportional circuit, with its inverting input terminal IN- connected to the common ground through the first resistor and simultaneously connected to its output terminal OUT through the second resistor. The output terminal OUT of the second operational amplifier is connected to the first analog input terminal ADC1 of the microcontroller.

[0007] The y-axis magnetic field detection circuit consists of a second magnetic field detection chip, a third operational amplifier, a fourth operational amplifier, a third resistor, and a fourth resistor. The power input terminal VCC of the second magnetic field detection chip is connected to the first power supply V1, the power ground GND is connected to the common ground, and the signal output terminal VOUT is connected to the non-inverting input terminal IN+ of the third operational amplifier. The third operational amplifier is configured as a voltage follower, with its inverting input terminal IN- connected to its output terminal OUT, and its output terminal OUT connected to the non-inverting input terminal IN+ of the fourth operational amplifier. The fourth operational amplifier is configured as a non-inverting proportional circuit, with its inverting input terminal IN- connected to the common ground through the third resistor and simultaneously connected to its output terminal OUT through the fourth resistor. The output terminal OUT of the fourth operational amplifier is connected to the second analog input terminal ADC2 of the microcontroller.

[0008] The z-axis magnetic field detection circuit consists of a third magnetic field detection chip, a fifth operational amplifier, a sixth operational amplifier, a fifth resistor, and a sixth resistor. The power input terminal VCC of the third magnetic field detection chip is connected to the first power supply V1, the power ground GND is connected to the common ground, and the signal output terminal VOUT is connected to the non-inverting input terminal IN+ of the fifth operational amplifier. The fifth operational amplifier is configured as a voltage follower, with its inverting input terminal IN- connected to its output terminal OUT, and its output terminal OUT connected to the non-inverting input terminal IN+ of the sixth operational amplifier. The sixth operational amplifier is configured as a non-inverting proportional circuit, with its inverting input terminal IN- connected to the common ground through the fifth resistor and simultaneously connected to its output terminal OUT through the sixth resistor. The output terminal OUT of the sixth operational amplifier is connected to the third analog input terminal ADC3 of the microcontroller.

[0009] The voltage detection circuit comprises a voltage sensor chip, a seventh operational amplifier, a first AD conversion chip, a first isolation chip, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, and a first capacitor. The voltage sensor chip's first voltage input terminal VIN1 is connected to an external voltage input 1 via the eleventh resistor (current limiting). The second voltage input terminal VIN2 is connected to an external voltage input 2. The first voltage output terminal OUT1 is connected to the inverting input terminal IN- of the seventh operational amplifier via the eighth resistor. The second voltage output terminal OUT2 is connected to the non-inverting input terminal IN+ of the seventh operational amplifier via the ninth resistor. The seventh operational amplifier is configured as a differential amplifier circuit. The inverting input terminal IN- of the seventh operational amplifier is connected to the output terminal OUT of the seventh operational amplifier via the seventh resistor and also via the first capacitor. The non-inverting input terminal I... N+ is connected to the common ground via the tenth resistor. The output terminal OUT of the seventh operational amplifier is connected to the analog input terminal Ain of the first AD converter chip. The serial clock terminal SCK of the first AD converter chip is connected to the output terminal a Voa of the first isolation chip. The data input terminal Din of the first AD converter chip is connected to the output terminal b Vob of the first isolation chip. The data output terminal Dout of the first AD converter chip is connected to the input terminal c Vic of the first isolation chip. The first isolation chip is connected to the microcontroller via SPI. The input terminal a Via of the first isolation chip is connected to the SPI1 clock output terminal SCK1 of the microcontroller. The input terminal b Vib of the first isolation chip is connected to the SPI1 data output terminal MOSI1 of the microcontroller. The output terminal c Voc of the first isolation chip is connected to the SPI1 data input terminal MISO1 of the microcontroller.

[0010] The current detection circuit consists of a current sensor chip, a second AD converter chip, a second isolation chip, a twelfth resistor, and a second capacitor. The current sensor chip's current input terminal IP+ is connected to an external current input, its current output terminal IP- is connected to an external current output, its power input terminal VCC is connected to a first power supply V1, its power ground GND is connected to a common ground, and its output terminal VIOUT is connected to the analog input terminal Ain of the second AD converter chip via the twelfth resistor for current limiting. The analog input terminal Ain of the second AD converter chip is connected to a common ground via the second capacitor, and its serial clock terminal SCK is connected to the second isolation chip's a... The output terminal Voa, the data input terminal Din of the second AD converter chip is connected to the b output terminal Vob of the second isolation chip, and the data output terminal Dout of the second AD converter chip is connected to the c input terminal Vic of the second isolation chip; the second isolation chip is connected to the microcontroller via SPI, the a input terminal Via of the second isolation chip is connected to the SPI2 clock output terminal SCK2 of the microcontroller, the b input terminal Vib of the second isolation chip is connected to the SPI2 data output terminal MOSI2 of the microcontroller, and the c output terminal Voc of the second isolation chip is connected to the SPI2 data input terminal MISO2 of the microcontroller.

[0011] The Ethernet communication circuit is composed of a first Ethernet chip. The first Ethernet chip is connected to the microcontroller via SPI. The data input terminal MOSI of the first Ethernet chip is connected to the SP3 data output terminal MOSI3 of the microcontroller. The data output terminal MISO of the first Ethernet chip is connected to the SP3 data input terminal MISO3 of the microcontroller. The clock output terminal SCK of the first Ethernet chip is connected to the SP3 clock output terminal SCK3 of the microcontroller.

[0012] The industrial serial touchscreen circuit comprises a first RS232 chip and an industrial serial touchscreen. The first RS232 chip is connected to the microcontroller via a serial port. The TTL transmit input terminal T1IN of the first RS232 chip is connected to the data transmit terminal TX1 of the USART1 of the microcontroller, and the TTL receive output terminal R1OUT of the first RS232 chip is connected to the data receive terminal RX1 of the USART1 of the microcontroller. The first RS232 chip is connected to the industrial serial touchscreen via RS232. The RS232 transmit output terminal T1OUT of the first RS232 chip is connected to the serial receive terminal RX of the industrial serial touchscreen, and the RS232 receive input terminal R1IN of the first RS232 chip is connected to the serial transmit terminal TX of the industrial serial touchscreen.

[0013] The beneficial effects of this utility model are that a data acquisition device for a multi-functional aluminum electrolysis unit can collect the voltage, current and three-axis magnetic field (x-axis magnetic field, y-axis magnetic field and z-axis magnetic field) of the multi-functional aluminum electrolysis unit and the main working motor in real time, and upload the monitored data for real-time monitoring and subsequent analysis and diagnosis of faults such as motor, bearing and wheel wear under strong magnetic field. Attached Figure Description

[0014] Figure 1 This is a system structure block diagram of a data acquisition device for a multi-functional aluminum electrolysis unit.

[0015] Figure 2 This is a schematic diagram of a data acquisition device for a multi-functional aluminum electrolysis unit.

[0016] Figure 3 This is a flowchart of the main program of a data acquisition device for a multi-functional aluminum electrolysis unit. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and examples.

[0018] like Figure 1As shown, a data acquisition device for a multi-functional aluminum electrolysis unit includes a microcontroller circuit 1, an x-axis magnetic field detection circuit 2, a y-axis magnetic field detection circuit 3, a z-axis magnetic field detection circuit 4, a voltage detection circuit 5, a current detection circuit 6, an Ethernet communication circuit 7, and an industrial serial port touch screen circuit 8. The microcontroller monitors the x-axis magnetic field strength, y-axis magnetic field strength, z-axis magnetic field strength, input voltage value, and input current value in real time, displays them on the industrial serial port touch screen circuit 7, and uploads them to a server via the Ethernet communication circuit 8.

[0019] like Figure 2 As shown, the microcontroller circuit 1 is composed of a microcontroller U1. The power input terminal VDD of the microcontroller U1 is connected to the first power supply V1, and the power ground VSS of the microcontroller U1 is connected to the common ground.

[0020] The x-axis magnetic field detection circuit 2 consists of a first magnetic field detection chip U2, a first operational amplifier U3, a second operational amplifier U4, a first resistor R1, and a second resistor R2. The power input terminal VCC of the first magnetic field detection chip U2 is connected to the first power supply V1, the power ground GND is connected to the common ground, and the signal output terminal VOUT is connected to the non-inverting input terminal IN+ of the first operational amplifier U3. The first operational amplifier U3 is configured as a voltage follower, and the inverting input terminal IN- of the first operational amplifier U3 is connected to the output terminal OUT of the first operational amplifier U3. The output terminal OUT of the first operational amplifier U3 is connected to the non-inverting input terminal IN+ of the second operational amplifier U4. The second operational amplifier U4 is configured as a non-inverting proportional circuit, and the inverting input terminal IN- of the second operational amplifier U4 is connected to the common ground through the first resistor R1 and to the output terminal OUT of the second operational amplifier U4 through the second resistor R2. The output terminal OUT of the second operational amplifier U4 is connected to the first analog input terminal ADC1 of the microcontroller U1.

[0021] The y-axis magnetic field detection circuit 3 consists of a second magnetic field detection chip U5, a third operational amplifier U6, a fourth operational amplifier U7, a third resistor R3, and a fourth resistor R4. The power input terminal VCC of the second magnetic field detection chip U5 is connected to the first power supply V1, the power ground GND is connected to the common ground, and the signal output terminal VOUT is connected to the non-inverting input terminal IN+ of the third operational amplifier U6. The third operational amplifier U6 is configured as a voltage follower, and its inverting input terminal IN- is connected to its output terminal OUT. The output terminal OUT of the third operational amplifier U6 is connected to the non-inverting input terminal IN+ of the fourth operational amplifier U7. The fourth operational amplifier U7 is configured as a non-inverting proportional circuit, and its inverting input terminal IN- is connected to the common ground through the third resistor R3, and simultaneously connected to its output terminal OUT through the fourth resistor R4. The output terminal OUT of the fourth operational amplifier U7 is connected to the second analog input terminal ADC2 of the microcontroller U1.

[0022] The z-axis magnetic field detection circuit 4 consists of a third magnetic field detection chip U8, a fifth operational amplifier U9, a sixth operational amplifier U10, a fifth resistor R5, and a sixth resistor R6. The power input terminal VCC of the third magnetic field detection chip U8 is connected to the first power supply V1, the power ground GND is connected to the common ground, and the signal output terminal VOUT is connected to the non-inverting input terminal IN+ of the fifth operational amplifier U9. The fifth operational amplifier U9 is configured as a voltage follower, and its inverting input terminal IN- is connected to its output terminal OUT. The output terminal OUT of the fifth operational amplifier U9 is connected to the non-inverting input terminal IN+ of the sixth operational amplifier U10. The sixth operational amplifier U10 is configured as a non-inverting proportional circuit, and its inverting input terminal IN- is connected to the common ground through the fifth resistor R5, and simultaneously connected to its output terminal OUT through the sixth resistor R6. The output terminal OUT of the sixth operational amplifier U10 is connected to the third analog input terminal ADC3 of the microcontroller U1.

[0023] The voltage detection circuit 5 comprises a voltage sensor chip U14, a seventh operational amplifier U13, a first AD conversion chip U12, a first isolation chip U11, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, and a first capacitor C1. The voltage sensor chip U14's first voltage input terminal VIN1 is connected to an external voltage input 1 via the eleventh resistor R11 (current limiting). Its second voltage input terminal VIN2 is connected to an external voltage input 2. The first voltage output terminal OUT1 is connected to the inverting input terminal IN- of the seventh operational amplifier U13 via the eighth resistor R8. The second voltage output terminal OUT2 is connected to the non-inverting input terminal IN+ of the seventh operational amplifier U13 via the ninth resistor R9. The seventh operational amplifier U13 is configured as a differential amplifier circuit. Its inverting input terminal IN- is connected to its output terminal OUT via the seventh resistor R7, and also via the first capacitor C1. The seventh operational amplifier U14... The non-inverting input terminal IN+ of the 3rd operational amplifier is connected to the common ground through the tenth resistor R10. The output terminal OUT of the seventh operational amplifier U13 is connected to the analog input terminal Ain of the first AD converter chip U12. The serial clock terminal SCK of the first AD converter chip U12 is connected to the a output terminal Voa of the first isolation chip U11. The data input terminal Din of the first AD converter chip U12 is connected to the b output terminal Vob of the first isolation chip U11. The data output terminal Dout of the first AD converter chip U12 is connected to the c input terminal Vic of the first isolation chip U11. The first isolation chip U11 is connected to the microcontroller U1 via SPI. The a input terminal Via of the first isolation chip U11 is connected to the SPI1 clock output terminal SCK1 of the microcontroller U1. The b input terminal Vib of the first isolation chip U11 is connected to the SPI1 data output terminal MOSI1 of the microcontroller U1. The c output terminal Voc of the first isolation chip U11 is connected to the SPI1 data input terminal MISO1 of the microcontroller U1.

[0024] The current detection circuit 6 consists of a current sensor chip U17, a second AD converter chip U16, a second isolation chip U15, a twelfth resistor R12, and a second capacitor C2. The current input terminal IP+ of the current sensor chip U17 is connected to an external current input, and the current output terminal IP- is connected to an external current output. The power input terminal VCC is connected to the first power supply V1, and the power ground GND is connected to the common ground. The output terminal VIOUT is connected to the analog input terminal Ain of the second AD converter chip U16 through the twelfth resistor R12 (current limiting). The analog input terminal Ain of the second AD converter chip U16 is connected to the common ground through the second capacitor C2. The serial clock terminal SCK is connected to the second isolation chip U15. The output terminal Voa, the data input terminal Din of the second AD conversion chip U16 is connected to the b output terminal Vob of the second isolation chip U15, and the data output terminal Dout of the second AD conversion chip U16 is connected to the c input terminal Vic of the second isolation chip U15; the second isolation chip U15 is connected to the microcontroller U1 via SPI, the a input terminal Via of the second isolation chip U15 is connected to the SPI2 clock output terminal SCK2 of the microcontroller U1, the b input terminal Vib of the second isolation chip U15 is connected to the SPI2 data output terminal MOSI2 of the microcontroller U1, and the c output terminal Voc of the second isolation chip U15 is connected to the SPI2 data input terminal MISO2 of the microcontroller U1.

[0025] The Ethernet communication circuit 7 is composed of a first Ethernet chip U18. The first Ethernet chip U18 is connected to the microcontroller U1 via SPI. The data input terminal MOSI of the first Ethernet chip U18 is connected to the SP3 data output terminal MOSI3 of the microcontroller U1. The data output terminal MISO of the first Ethernet chip U18 is connected to the SP3 data input terminal MISO3 of the microcontroller U1. The clock output terminal SCK of the first Ethernet chip U18 is connected to the SP3 clock output terminal SCK3 of the microcontroller U1.

[0026] The industrial serial port touch screen circuit 8 consists of a first RS232 chip U19 and an industrial serial port touch screen U20. The first RS232 chip U19 is connected to the microcontroller U1 via a serial port. The TTL transmit input terminal T1IN of the first RS232 chip U19 is connected to the data transmit terminal TX1 of the USART1 of the microcontroller U1, and the TTL receive output terminal R1OUT of the first RS232 chip U19 is connected to the data receive terminal RX1 of the USART1 of the microcontroller U1. The first RS232 chip U19 is connected to the industrial serial port touch screen U20 via RS232. The RS232 transmit output terminal T1OUT of the first RS232 chip U19 is connected to the serial port receive terminal RX of the industrial serial port touch screen U20, and the RS232 receive input terminal R1IN of the first RS232 chip U19 is connected to the serial port transmit terminal TX of the industrial serial port touch screen U20.

[0027] like Figure 3 The diagram shown is the main program flowchart. The specific steps of the main process are as follows:

[0028] Step 1: Power-on initialization;

[0029] Step 2, voltage detection;

[0030] Step 3, current detection;

[0031] Step 4: Detect the magnetic field along the x-axis, y-axis, and z-axis;

[0032] Step 5: The data is transmitted to the server via Ethernet;

[0033] Step six, proceed to step two.

[0034] It should be noted that, for the present utility model which has been fully described, there may be various variations and modifications, and it is not limited to the specific examples of the above-described embodiments. The above examples are merely illustrative of the present utility model and not limiting. In short, the protection scope of the present utility model includes any variations, substitutions and modifications that are obvious to those skilled in the art.

Claims

1. A data acquisition device for a multi-functional aluminum electrolysis unit, comprising a microcontroller circuit, an Ethernet communication circuit, and an industrial serial port touchscreen circuit; characterized in that... It also includes an x-axis magnetic field detection circuit, a y-axis magnetic field detection circuit, a z-axis magnetic field detection circuit, a voltage detection circuit, and a current detection circuit; The microcontroller circuit consists of a microcontroller, with the microcontroller's power input terminal VDD connected to the first power supply V1, and the microcontroller's power ground VSS connected to the common ground. The x-axis magnetic field detection circuit consists of a first magnetic field detection chip, a first operational amplifier, a second operational amplifier, a first resistor, and a second resistor. The power input terminal VCC of the first magnetic field detection chip is connected to the first power supply V1, the power ground GND is connected to the common ground, and the signal output terminal VOUT is connected to the non-inverting input terminal IN+ of the first operational amplifier. The first operational amplifier is configured as a voltage follower, with its inverting input terminal IN- connected to its output terminal OUT, and its output terminal OUT connected to the non-inverting input terminal IN+ of the second operational amplifier. The second operational amplifier is configured as a non-inverting proportional circuit, with its inverting input terminal IN- connected to the common ground through the first resistor and simultaneously connected to its output terminal OUT through the second resistor. The output terminal OUT of the second operational amplifier is connected to the first analog input terminal ADC1 of the microcontroller. The y-axis magnetic field detection circuit consists of a second magnetic field detection chip, a third operational amplifier, a fourth operational amplifier, a third resistor, and a fourth resistor. The power input terminal VCC of the second magnetic field detection chip is connected to the first power supply V1, the power ground GND is connected to the common ground, and the signal output terminal VOUT is connected to the non-inverting input terminal IN+ of the third operational amplifier. The third operational amplifier is configured as a voltage follower, with its inverting input terminal IN- connected to its output terminal OUT, and its output terminal OUT connected to the non-inverting input terminal IN+ of the fourth operational amplifier. The fourth operational amplifier is configured as a non-inverting proportional circuit, with its inverting input terminal IN- connected to the common ground through the third resistor and simultaneously connected to its output terminal OUT through the fourth resistor. The output terminal OUT of the fourth operational amplifier is connected to the second analog input terminal ADC2 of the microcontroller. The z-axis magnetic field detection circuit consists of a third magnetic field detection chip, a fifth operational amplifier, a sixth operational amplifier, a fifth resistor, and a sixth resistor. The power input terminal VCC of the third magnetic field detection chip is connected to the first power supply V1, the power ground GND is connected to the common ground, and the signal output terminal VOUT is connected to the non-inverting input terminal IN+ of the fifth operational amplifier. The fifth operational amplifier is configured as a voltage follower, with its inverting input terminal IN- connected to its output terminal OUT, and its output terminal OUT connected to the non-inverting input terminal IN+ of the sixth operational amplifier. The sixth operational amplifier is configured as a non-inverting proportional circuit, with its inverting input terminal IN- connected to the common ground through the fifth resistor and simultaneously connected to its output terminal OUT through the sixth resistor. The output terminal OUT of the sixth operational amplifier is connected to the third analog input terminal ADC3 of the microcontroller. The voltage detection circuit comprises a voltage sensor chip, a seventh operational amplifier, a first AD conversion chip, a first isolation chip, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, and a first capacitor. The first voltage input terminal VIN1 of the voltage sensor chip is connected to an external voltage input 1 via the eleventh resistor (current limiting). The second voltage input terminal VIN2 is connected to an external voltage input 2. The first voltage output terminal OUT1 is connected to the inverting input terminal IN- of the seventh operational amplifier via the eighth resistor, and the second voltage output terminal OUT2 is connected to the non-inverting input terminal IN+ of the seventh operational amplifier via the ninth resistor. The seventh operational amplifier is configured as a differential amplifier circuit. The inverting input terminal IN- of the seventh op-amp is connected to the output terminal OUT of the seventh op-amp through the seventh resistor, and also through the first capacitor. The non-inverting input terminal IN+ of the seventh op-amp is connected to the common ground through the tenth resistor. The output terminal OUT of the seventh op-amp is connected to the analog input terminal Ain of the first AD converter chip. The serial clock terminal SCK of the first AD converter chip is connected to the output terminal a Voa of the first isolation chip. The data input terminal Din of the first AD converter chip is connected to the output terminal b Vob of the first isolation chip. The data output terminal Dout of the first AD converter chip is connected to the input terminal c Vic of the first isolation chip. The first isolation chip is connected to the microcontroller via SPI. The a input terminal Via of the first isolation chip is connected to the SPI1 clock output terminal SCK1 of the microcontroller. The b input terminal Vib of the first isolation chip is connected to the SPI1 data output terminal MOSI1 of the microcontroller. The c output terminal Voc of the first isolation chip is connected to the SPI1 data input terminal MISO1 of the microcontroller. The current detection circuit consists of a current sensor chip, a second AD conversion chip, a second isolation chip, a twelfth resistor, and a second capacitor. The current input terminal IP+ of the current sensor chip is connected to an external current input, the current output terminal IP- is connected to an external current output, the power input terminal VCC is connected to the first power supply V1, the power ground GND is connected to the common ground, and the output terminal VIOUT is connected to the analog input terminal Ain of the second AD conversion chip through the twelfth resistor for current limiting. The analog input terminal Ain of the second AD conversion chip is connected to the common ground through the second capacitor. The serial clock terminal SCK is connected to the output terminal Voa of the second isolation chip. The data input terminal Din of the second AD conversion chip is connected to the output terminal Vob of the second isolation chip. The data output terminal Dout of the second AD conversion chip is connected to the input terminal Vic of the second isolation chip. The second isolation chip is connected to the microcontroller via SPI. The a input terminal Via of the second isolation chip is connected to the SPI2 clock output terminal SCK2 of the microcontroller, the b input terminal Vib of the second isolation chip is connected to the SPI2 data output terminal MOSI2 of the microcontroller, and the c output terminal Voc of the second isolation chip is connected to the SPI2 data input terminal MISO2 of the microcontroller. The Ethernet communication circuit is composed of a first Ethernet chip; the first Ethernet chip is connected to the microcontroller via SPI, the data input terminal MOSI of the first Ethernet chip is connected to the SP3 data output terminal MOSI3 of the microcontroller, the data output terminal MISO of the first Ethernet chip is connected to the SP3 data input terminal MISO3 of the microcontroller, and the clock output terminal SCK of the first Ethernet chip is connected to the SP3 clock output terminal SCK3 of the microcontroller. The industrial serial touchscreen circuit comprises a first RS232 chip and an industrial serial touchscreen. The first RS232 chip is connected to the microcontroller via a serial port. The TTL transmit input terminal T1IN of the first RS232 chip is connected to the data transmit terminal TX1 of the USART1 of the microcontroller, and the TTL receive output terminal R1OUT of the first RS232 chip is connected to the data receive terminal RX1 of the USART1 of the microcontroller. The first RS232 chip is connected to the industrial serial touchscreen via RS232. The RS232 transmit output terminal T1OUT of the first RS232 chip is connected to the serial receive terminal RX of the industrial serial touchscreen, and the RS232 receive input terminal R1IN of the first RS232 chip is connected to the serial transmit terminal TX of the industrial serial touchscreen.

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