CN110658237A - Automatic milk conductivity detection system - Google Patents
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- CN110658237A CN110658237A CN201911024065.9A CN201911024065A CN110658237A CN 110658237 A CN110658237 A CN 110658237A CN 201911024065 A CN201911024065 A CN 201911024065A CN 110658237 A CN110658237 A CN 110658237A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
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- G01N27/06—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N35/00—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor
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Abstract
The invention discloses an automatic detection system for milk conductivity, which comprises a power supply VCC, a central control module, a signal generation module, an acquisition module, an amplification circuit, an optical coupling circuit and a filter circuit, wherein the power supply VCC is respectively connected with the central control module, the signal generation module, the acquisition module, the amplification circuit, the optical coupling circuit and the filter circuit, the central control module is respectively connected with the signal generation module, the acquisition module and the filter circuit, and a coupling circuit formed by an optical coupling chip TL2521-4 and a linear optical coupling chip HCNR201 is adopted to play an isolation role in signal transmission, and the application of the linear optical coupling not only effectively inhibits the interference in the system, but also enables signals before and after the coupling circuit to have good linear relation, thereby ensuring the accuracy of measurement.
Description
Technical Field
The invention relates to an automatic detection system for milk conductivity.
Background
In the current highly automated industrial era, the automation level of agriculture, breeding industry and handicraft industry is still relatively lagged behind, but China is a big agricultural country, and the production level of agriculture and breeding industry is a key factor for the comprehensive national force development of China. It is necessary to design and manufacture a complete system which can be applied to actual production. The intelligent detection and control technology has been widely applied to various production fields, and has become an essential part of an automatic production system. The device is respectively applied to detect the production conditions (such as working voltage, field temperature and the like) or the product attributes (such as product quantity, quality and the like), and then the computer analyzes the detection result to correspondingly control the production process. For example, in the subject of "design and manufacture of conductivity meter for liquid crystal display", an automatic detection system for milk conductivity applies an intelligent detection and control technique.
The production of qualified milk is the production purpose of a milk manufacturing plant, and in actual production, when the milk is injected into a container, the milk around an electrode can vibrate continuously, which can cause interference on measurement, so that the detection of the milk conductance is a very important production link.
Disclosure of Invention
In order to solve the technical problem, the invention provides an automatic detection system for milk conductivity.
The invention is realized by the following technical scheme.
The invention provides an automatic detection system for milk conductivity, which comprises a power supply VCC, a central control module, a signal generation module, an acquisition module, an amplification circuit, an optical coupling circuit and a filter circuit, wherein the power supply VCC is respectively connected with the central control module, the signal generation module, the acquisition module, the amplification circuit, the optical coupling circuit and the filter circuit, and the central control module is respectively connected with the signal generation module and the acquisition module.
The central control module comprises a single chip microcomputer U1, a crystal oscillator Y2, a capacitor C2, a capacitor C17, a capacitor C18 and a resistor R2, wherein 18 pins and 19 pins of the single chip microcomputer U1 are respectively connected with two ends of a crystal oscillator Y2, two ends of the crystal oscillator Y2 are respectively connected with one end of a capacitor C17 and one end of a capacitor C18, the other end of the capacitor C17 and the other end of the capacitor C18 are respectively grounded, a 9 pin of the single chip microcomputer U1 is respectively connected with one end of a capacitor C12 and one end of a resistor R2, the other end of a resistor R2 is grounded, the other end of a capacitor C2 is connected with a power supply VCC, a 31 pin and a 40 pin of the single chip microcomputer U1 are respectively connected with.
The signal generation module comprises an optical coupling isolation chip U2, an operational amplifier chip U7, a capacitor C1 and a resistor R1, an interface JP and an adjustable resistor RP, a pulse signal generated by a single chip microcomputer U1 is transmitted into a pin 1 of the optical coupling isolation chip U2, a pin 2 of the optical coupling isolation chip U2 is grounded, a pin 4 of the optical coupling isolation chip U2 is connected with a power VCC, a pin 3 of the optical coupling isolation chip U2 is connected with one end of a resistor R1 and one end of a capacitor C1 respectively, the other end of the resistor R1 is connected with the ground and a pin 3 of the operational amplifier chip U7, the other end of the capacitor C1 is connected with a pin 2 of the operational amplifier chip U7, a pin 2 of the operational amplifier chip U7 is connected with a pin 1 of the operational amplifier chip U7, a pin 1 of the operational amplifier chip U7 is connected with a pin 2 of the interface JP, a pin 4 of the operational amplifier chip U7 is grounded, a pin 11 of the operational amplifier chip U7 is.
The acquisition module comprises an A/D conversion chip U5, an A/D conversion chip U6 and an adjustable resistor RP1, wherein a pin 3 and a pin 4 of the A/D conversion chip U5 are grounded after short circuit, a pin 5 of the A/D conversion chip U5 is connected with a power supply VCC, a pin 6 of the A/D conversion chip U5 is connected with a pin 4 of a singlechip U1, a pin 7 of the A/D conversion chip U5 is connected with a pin 1 of the singlechip U1, a pin 8 of the A/D conversion chip U5 is connected with a moving end of the adjustable resistor RP1, one end of a binding post of the adjustable resistor RP1 is connected with the power supply VCC, the other end of the binding post is grounded, and a pin 1 of the A/D conversion chip U5 is connected with a pin 2 of the singlechip U1.
The amplifying circuit comprises an operational amplifier chip U8, an operational amplifier chip U12, resistors R3-R7 and resistors R12-R16, wherein a pin 1 of an interface JP is connected with one end of the resistor R3 and one end of the resistor R4 respectively, the other end of the resistor R4 is connected with a pin 2 of the operational amplifier chip U8 and one end of the resistor R7 respectively, the other end of the resistor R7 is connected with a pin 1 of the operational amplifier chip U8, the other end of the resistor R3 is connected with ground and one end of a capacitor C3 respectively, the other end of the capacitor C3 is connected with a pin 3 of the operational amplifier chip U8, a pin 3 of the operational amplifier chip U8 is connected with one end of the resistor R6 and one end of the resistor R5 respectively, the other end of the resistor R6 is connected with a pin 11 of the operational amplifier chip U63.
The optical coupling circuit comprises an operational amplifier chip U9, U10, a capacitor C4, a capacitor C5 and resistors R8-R10, the linear optocoupler chip U3, a pin 2 of the operational amplifier chip U9 is connected with one end of a resistor R8 and one end of a capacitor C4 respectively, the other end of a resistor R8 is connected with a pin 1 of an operational amplifier chip U8, a pin 3 of the operational amplifier chip U9 is grounded, a pin 1 of the operational amplifier chip U9 is connected with the other end of a capacitor C4 and one end of a resistor R9, the other end of the resistor R9 is connected with a pin 1 of a linear optocoupler chip U3, a pin 2 of the linear optocoupler chip U3 is connected with a power VCC, a pin 3 of the linear optocoupler chip U3 is connected with a pin 2 of the operational amplifier chip U9, a pin 4 of the linear optocoupler chip U3 is grounded, a pin 5 and a pin 6 of the linear optocoupler chip U3 are connected with a pin 2 of the operational amplifier chip U10 and a pin 3, a pin 2 of the operational amplifier chip U10 is connected with one end of a pin 2 of a capacitor C5 respectively, the other end of a pin C695.
The filter circuit comprises an operational amplifier chip U11, a resistor R11 and capacitors C6-C8, wherein a pin 2 of the operational amplifier chip U11 is connected with a pin 1 of an operational amplifier chip U10, a pin 3 of the operational amplifier chip U11 is grounded, a pin 1 of the operational amplifier chip U11 is connected with a pin 2 of an A/D conversion chip U5, a resistor R11 is connected between the pin 1 and the pin 2 of the operational amplifier chip U11 in parallel, a capacitor C8 is connected with the resistor R11 in parallel, and a capacitor C6 is connected with the capacitor C7 in series and then connected with the capacitor C8 in parallel.
The model of the single chip microcomputer U1 is W78E58B, the model of the optical coupling isolation chip U2 is TL2521-4, the model of the linear optical coupling chip U3 and the model of the linear optical coupling chip U4 are HCNR201, the model of the A/D conversion chip U5 and the model of the A/D conversion chip U6 are TCL0831, and the model of the operational amplifier chips U7-U15 are LM 324A.
The invention has the beneficial effects that: a detection electrode is added on the upper portion of a container, so that a switch signal is generated when the detection electrode is in contact with milk, the starting of detection is controlled, the reliability of the system can be improved, alternating detection signals are adopted by the system, a fixed electric field is prevented from being formed around the electrode, and therefore the polarization phenomenon is effectively avoided.
Drawings
Fig. 1 is a circuit schematic of the present invention.
Detailed Description
The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
The utility model provides a milk conductivity automatic check out system, includes power VCC, central control module, signal generation module, collection module, amplifier circuit, opto-coupler circuit, filter circuit, display module, and the power VCC is connected respectively with central control module, signal generation module, collection module, display module, amplifier circuit, opto-coupler circuit, filter circuit, and central control module and signal generation module, collection module, display module, are connected respectively.
The central control module comprises a single chip microcomputer U1, a crystal oscillator Y2, a capacitor C2, a capacitor C17, a capacitor C18 and a resistor R2, wherein 18 pins and 19 pins of the single chip microcomputer U1 are respectively connected with two ends of a crystal oscillator Y2, two ends of the crystal oscillator Y2 are respectively connected with one end of a capacitor C17 and one end of a capacitor C18, the other end of the capacitor C17 and the other end of the capacitor C18 are respectively grounded, 9 pins of the single chip microcomputer U1 are respectively connected with one end of a capacitor C12 and one end of a resistor R2, the other end of a resistor R2 is grounded, the other end of the capacitor C2 is connected with a power supply VCC, 31 pins and 40 pins of the single chip microcomputer U1 are respectively connected with the power.
Before milk is input, a pulse signal output by a single chip microcomputer is subjected to impedance matching and photoelectric isolation through a driving circuit, the signal passing through the driving circuit can be used as an excitation signal to be input into the milk, so that an output detection signal can be a stable signal, and meanwhile, the signal can be easily collected, a signal generating module comprises an optical coupling isolation chip U2, an operational amplifier chip U7, a capacitor C1 and a resistor R1, an interface JP and an adjustable resistor RP, the pulse signal generated by the single chip microcomputer U1 is transmitted into a pin 1 of the optical coupling isolation chip U2, a pin 2 of the optical coupling isolation chip U2 is grounded, a pin 4 of the optical coupling isolation chip U2 is connected with a power supply VCC, a pin 3 of the optical coupling isolation chip U2 is respectively connected with one end of a resistor R1 and one end of a capacitor C1, the other end of the resistor R1 is connected with the ground and a pin 3 of the operational amplifier chip U7, the other end of the capacitor C1 is connected with a pin 2 of the operational amplifier chip U7, and a pin 2 of the operational, a pin 1 of the operational amplifier chip U7 is connected with a pin 2 of the interface JP, a pin 4 of the operational amplifier chip U7 is grounded, a pin 11 of the operational amplifier chip U7 is connected with a power supply VCC, and three pins are led out from the interface JP and are respectively inserted into milk.
The acquisition module comprises an A/D conversion chip U5, an A/D conversion chip U6 and an adjustable resistor RP1, wherein a pin 3 and a pin 4 of the A/D conversion chip U5 are grounded after short circuit, a pin 3 and a pin 4 of the A/D conversion chip U6 are grounded after short circuit, a pin 5 of the A/D conversion chip U5 is connected with a pin 5 of the A/D conversion chip U6 and is connected with a power supply VCC, a pin 6 of the A/D conversion chip U5 is connected with a pin 6 of the A/D conversion chip U6 and is connected with a pin 4 of a singlechip U1, a pin 7 of the A/D conversion chip U5 is connected with a pin 7 of the A/D conversion chip U6 and is connected with a pin 1 of the singlechip U1, a pin 8 of the A/D conversion chip U5 is connected with a pin 8 of the A/D conversion chip U6 and is connected with a moving end of the adjustable resistor RP1, one end of the adjustable resistor RP1 is connected with a power supply VCC, the other end of the binding post is grounded, and a pin 1 of the A/D conversion chip U5 and a pin 1 of the A/D conversion chip U6 are respectively connected with a pin 2 and a pin 3 of the singlechip U1.
In this embodiment, the amplifying circuit, the optical coupling circuit, and the filter circuit are designed in redundant form, respectively, so as to ensure stability during the testing process.
The amplifying circuit comprises an operational amplifier chip U8, an operational amplifier chip U12, resistors R3-R7 and resistors R12-R16, wherein a pin 1 of an interface JP is respectively connected with one end of the resistor R3 and one end of the resistor R4, the other end of the resistor R4 is respectively connected with a pin 2 of the operational amplifier chip U8 and one end of the resistor R7, the other end of the resistor R7 is connected with a pin 1 of the operational amplifier chip U8, the other end of the resistor R3 is respectively connected with the ground and one end of a capacitor C3, the other end of the capacitor C3 is connected with a pin 3 of the operational amplifier chip U8, a pin 3 of the operational amplifier chip U8 is respectively connected with one end of the resistor R6 and one end of the resistor R5, the other end of the resistor R6 is connected with a pin 11 of the operational amplifier chip; the 3 feet of interface JP are connected with one end of resistor R12, one end of resistor R13 is connected respectively, the other end of resistor R13 is connected with the 2 feet of operational amplifier chip U12, one end of resistor R16 is connected respectively, the other end of resistor R16 is connected with the 1 foot of operational amplifier chip U12, the other end of resistor R12 is connected with ground, one end of capacitor C9 is connected respectively, the other end of capacitor C9 is connected with the 3 feet of operational amplifier chip U12, the 3 feet of operational amplifier chip U12 is connected with one end of resistor R14, one end of resistor R15 is connected respectively, the other end of resistor R15 is connected with the 11 feet of operational amplifier chip U12, and the other end of resistor R14 is.
The optical coupling circuit comprises an operational amplifier chip U9, a capacitor C9, resistors R9-R9, a linear optical coupling chip U9 and a linear optical coupling chip U9, wherein a pin 2 of the operational amplifier chip U9 is respectively connected with one end of the resistor R9 and one end of the capacitor C9, the other end of the resistor R9 is connected with a pin 1 of the operational amplifier chip U9, a pin 3 of the operational amplifier chip U9 is grounded, a pin 1 of the operational amplifier chip U9 is connected with the other end of the capacitor C9 and one end of the resistor R9, the other end of the resistor R9 is connected with a pin 1 of the linear optical coupling chip U9, a pin 2 of the linear optical coupling chip U9 is connected with a power supply VCC, a pin 3 of the linear optical coupling chip U9 is connected with a pin 2 of the operational amplifier chip U9, a pin 4 of the linear optical coupling chip U9 is grounded, a pin 365 of the linear optical coupling chip U9 is respectively connected with one end of the capacitor C9, and one end, the other end of the capacitor C5 is connected with a pin 1 of the operational amplifier U10, and the resistor R10 is connected in parallel with the two ends of the capacitor C5; a pin 2 of the operational amplifier chip U13 is connected with one end of a resistor R17 and one end of a capacitor C10 respectively, the other end of the resistor R17 is connected with a pin 1 of the operational amplifier chip U13, a pin 3 of the operational amplifier chip U13 is grounded, a pin 1 of the operational amplifier chip U13 is connected with the other end of a capacitor C10 and one end of a resistor R18, the other end of a resistor R18 is connected with a pin 1 of a linear optocoupler chip U4, a pin 2 of the linear optocoupler chip U4 is connected with a power supply VCC, a pin 3 of the linear optocoupler chip U4 is connected with a pin 2 of the operational amplifier chip U13, a pin 4 of the linear optocoupler chip U4 is grounded, and a pin 5 of the linear optoco, the 6 feet are respectively connected with the 2 feet and the 3 feet of the operational amplifier chip U14, the 2 feet of the operational amplifier chip U14 are respectively connected with one end of a capacitor C11, the other end of the capacitor C11 is connected with the 1 foot of the operational amplifier U14, a resistor R19 is connected at two ends of a capacitor C11 in parallel, an optical coupling circuit is used for isolating, the effect of the optical coupling circuit is that the front circuit and the rear circuit are independent, and therefore interference caused by mutual influence is reduced.
The filter circuit comprises an operational amplifier chip U11, a resistor R11, capacitors C6-C8, an operational amplifier chip U15, a resistor R20 and capacitors C12-C14, wherein a pin 2 of the operational amplifier chip U11 is connected with a pin 1 of an operational amplifier chip U10, a pin 3 of the operational amplifier chip U11 is grounded, a pin 1 of the operational amplifier chip U11 is connected with a pin 2 of an A/D conversion chip U5, a resistor R11 is connected between the pin 1 and the pin 2 of the operational amplifier chip U11 in parallel, a capacitor C8 is connected with the resistor R11 in parallel, and a capacitor C6 is connected with a capacitor C7 in series and then connected with a capacitor C8 in parallel; the 2 pin of the operational amplifier chip U15 is connected with the 1 pin of the operational amplifier chip U14, the 3 pin of the operational amplifier chip U15 is grounded, the 1 pin of the operational amplifier chip U15 is connected with the 2 pin of the A/D conversion chip U6, a resistor R20 is connected between the 1 pin and the 2 pin of the operational amplifier chip U15 in parallel, a capacitor C14 is connected with the resistor R20 in parallel, a capacitor C12 is connected with the capacitor C13 in series and then connected with a capacitor C14 in parallel, and a filter circuit can filter out high-frequency parts in detection signals, so that the signals are smooth, and A/D conversion is facilitated.
The model of the singlechip U1 is W78E58B, the model of the optical coupling isolation chip U2 is TL2521-4, the model of the linear optical coupling chip U3 and the model of the linear optical coupling chip U4 are HCNR201, the model of the A/D conversion chip U5 and the model of the A/D conversion chip U6 are TCL0831, and the model of the operational amplifier chips U7-U15 are LM 324A.
In practical test, one exciting electrode and two detecting electrodes are connected to milk, a 10kHz pulse signal is input from the exciting electrode, detecting signals are respectively generated on the detecting electrodes, one of the detecting electrodes is also used as a switch value for controlling detection starting, the detecting signals are processed through amplification, filtering, A/D conversion and the like, and are input to a single chip microcomputer circuit for calculation, and the conductance value of the milk can be obtained.
Claims (8)
1. The utility model provides a milk conductivity automatic check out system which characterized in that: including power VCC, central control module, signal generation module, collection module, amplifier circuit, opto-coupler circuit, filter circuit, power VCC and central control module, signal generation module, collection module, amplifier circuit, opto-coupler circuit, filter circuit are connected respectively, and central control module and signal generation module, collection module, be connected respectively.
2. The automatic milk conductivity detection system of claim 1, wherein: the central control module comprises a single chip microcomputer U1, a crystal oscillator Y2, a capacitor C2, a capacitor C17, a capacitor C18 and a resistor R2, wherein 18 pins and 19 pins of the single chip microcomputer U1 are respectively connected with two ends of a crystal oscillator Y2, two ends of the crystal oscillator Y2 are respectively connected with one end of a capacitor C17 and one end of a capacitor C18, the other end of the capacitor C17 and the other end of the capacitor C18 are respectively grounded, a 9 pin of the single chip microcomputer U1 is respectively connected with one end of a capacitor C12 and one end of a resistor R2, the other end of a resistor R2 is grounded, the other end of a capacitor C2 is connected with a power supply VCC, a 31 pin and a 40 pin of the single chip microcomputer U1 are respectively connected with.
3. The automatic milk conductivity detection system of claim 1, wherein: the signal generation module comprises an optical coupling isolation chip U2, an operational amplifier chip U7, a capacitor C1 and a resistor R1, an interface JP and an adjustable resistor RP, a pulse signal generated by a single chip microcomputer U1 is transmitted into a pin 1 of the optical coupling isolation chip U2, a pin 2 of the optical coupling isolation chip U2 is grounded, a pin 4 of the optical coupling isolation chip U2 is connected with a power VCC, a pin 3 of the optical coupling isolation chip U2 is connected with one end of a resistor R1 and one end of a capacitor C1 respectively, the other end of the resistor R1 is connected with the ground and a pin 3 of the operational amplifier chip U7, the other end of the capacitor C1 is connected with a pin 2 of the operational amplifier chip U7, a pin 2 of the operational amplifier chip U7 is connected with a pin 1 of the operational amplifier chip U7, a pin 1 of the operational amplifier chip U7 is connected with a pin 2 of the interface JP, a pin 4 of the operational amplifier chip U7 is grounded, a pin 11 of the operational amplifier chip U7 is.
4. The automatic milk conductivity detection system of claim 1, wherein: the acquisition module comprises an A/D conversion chip U5, an A/D conversion chip U6 and an adjustable resistor RP1, wherein a pin 3 and a pin 4 of the A/D conversion chip U5 are grounded after short circuit, a pin 5 of the A/D conversion chip U5 is connected with a power supply VCC, a pin 6 of the A/D conversion chip U5 is connected with a pin 4 of a singlechip U1, a pin 7 of the A/D conversion chip U5 is connected with a pin 1 of the singlechip U1, a pin 8 of the A/D conversion chip U5 is connected with a moving end of the adjustable resistor RP1, one end of a binding post of the adjustable resistor RP1 is connected with the power supply VCC, the other end of the binding post is grounded, and a pin 1 of the A/D conversion chip U5 is connected with a pin 2 of the singlechip U1.
5. The automatic milk conductivity detection system of claim 1, wherein: the amplifying circuit comprises an operational amplifier chip U8, an operational amplifier chip U12, resistors R3-R7 and resistors R12-R16, wherein a pin 1 of an interface JP is connected with one end of the resistor R3 and one end of the resistor R4 respectively, the other end of the resistor R4 is connected with a pin 2 of the operational amplifier chip U8 and one end of the resistor R7 respectively, the other end of the resistor R7 is connected with a pin 1 of the operational amplifier chip U8, the other end of the resistor R3 is connected with ground and one end of a capacitor C3 respectively, the other end of the capacitor C3 is connected with a pin 3 of the operational amplifier chip U8, a pin 3 of the operational amplifier chip U8 is connected with one end of the resistor R6 and one end of the resistor R5 respectively, the other end of the resistor R6 is connected with a pin 11 of the operational amplifier chip U63.
6. The automatic milk conductivity detection system of claim 1, wherein: the optical coupling circuit comprises an operational amplifier chip U9, U10, a capacitor C4, a capacitor C5 and resistors R8-R10, the linear optocoupler chip U3, a pin 2 of the operational amplifier chip U9 is connected with one end of a resistor R8 and one end of a capacitor C4 respectively, the other end of a resistor R8 is connected with a pin 1 of an operational amplifier chip U8, a pin 3 of the operational amplifier chip U9 is grounded, a pin 1 of the operational amplifier chip U9 is connected with the other end of a capacitor C4 and one end of a resistor R9, the other end of the resistor R9 is connected with a pin 1 of a linear optocoupler chip U3, a pin 2 of the linear optocoupler chip U3 is connected with a power VCC, a pin 3 of the linear optocoupler chip U3 is connected with a pin 2 of the operational amplifier chip U9, a pin 4 of the linear optocoupler chip U3 is grounded, a pin 5 and a pin 6 of the linear optocoupler chip U3 are connected with a pin 2 of the operational amplifier chip U10 and a pin 3, a pin 2 of the operational amplifier chip U10 is connected with one end of a pin 2 of a capacitor C5 respectively, the other end of a pin C695.
7. The automatic milk conductivity detection system of claim 1, wherein: the filter circuit comprises an operational amplifier chip U11, a resistor R11 and capacitors C6-C8, wherein a pin 2 of the operational amplifier chip U11 is connected with a pin 1 of an operational amplifier chip U10, a pin 3 of the operational amplifier chip U11 is grounded, a pin 1 of the operational amplifier chip U11 is connected with a pin 2 of an A/D conversion chip U5, a resistor R11 is connected between the pin 1 and the pin 2 of the operational amplifier chip U11 in parallel, a capacitor C8 is connected with the resistor R11 in parallel, and a capacitor C6 is connected with the capacitor C7 in series and then connected with the capacitor C8 in parallel.
8. An automatic milk conductivity detection system according to any one of claims 1 to 7, wherein: the model of the single chip microcomputer U1 is W78E58B, the model of the optical coupling isolation chip U2 is TL2521-4, the model of the linear optical coupling chip U3 and the model of the linear optical coupling chip U4 are HCNR201, the model of the A/D conversion chip U5 and the model of the A/D conversion chip U6 are TCL0831, and the model of the operational amplifier chips U7-U15 are LM 324A.
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