Signal processing integrated circuit system of metal liquid level sensor

Abstract

The utility model discloses a metal liquid level sensor signal processing integrated circuit system. A circuit board main body comprises a modulation-demodulation main board, a motor and a temperature compensation control board; the modulation-demodulation mainboard is provided with a first power input end, a second power input end, an FPGA chip module, a first digital-to-analog conversion module, a second digital-to-analog conversion module, a first gain-adjustable operational amplifier, a second gain-adjustable operational amplifier, a third gain-adjustable operational amplifier, a coaxial cable connecting end, a phase-shifting transformer, an analog-to-digital conversion module, a DA conversion module and a first signal output end. The motor and temperature compensation control panel is provided with a first power signal connecting end, a second signal input end, a second signal input end, a PLC output end, a temperature difference compensation module, an analog adder module, an electric push rod telescopic rod control module, an electric push rod highest and lowest limiting module, a first power input end, a second power output end and a K-type temperature amplifier. The signal processing integrated circuit system kneads the temperature measuring electric joint and the electromagnetic coil to transmit data, and assists a PLC program to control opening and closing of a molten metal discharging pipeline.

Description

Technical Field

[0001] The utility model relates to the technical field of sensing detection, in particular to a signal processing integrated circuit system of a metal liquid level sensor. Background Technique

[0002] In the metallurgical casting industry, the molten metal in the melting furnace is exported through a transmission pipeline. The pipe orifice of the transmission pipeline is fixed on the metal molten pouring truss and pours the molten metal into the lower mold. In order to ensure that the volume of the molten metal in each mold poured through the pouring truss by the transmission pipeline is consistent, a metal liquid level sensor is installed near the transmission pipe orifice on the pouring truss. When the metal liquid level sensor detects that the molten metal in the mold reaches the required liquid level, the metal liquid level sensor will control and close the valve provided at the transmission pipe orifice through the PLC control device to stop pouring the molten metal into the mold. However, the measurement result of the traditional metal liquid level sensor has poor linearity. The reason for the poor linearity of the measurement of the metal liquid level sensor is also that the change of the environmental temperature and the temperature change after the electromagnetic coil in the sensor head of the metal liquid level sensor itself is energized will affect the detection accuracy of the sensor head of the metal liquid level sensor.

[0003] Therefore, the currently adopted metal liquid level sensor is an eddy current sensor. The main components of the eddy current sensor include a sensor head, a receiving circuit and a signal processing integrated circuit system. The sensor head contains an electromagnetic coil and a temperature measuring thermocouple. The biggest feature of the eddy current sensor is that the electromagnetic coil of the sensor probe itself is sleeved outside the temperature measuring thermocouple. In this way, the temperature measuring thermocouple can measure the temperature of the electromagnetic coil and its surrounding environment in real time. Thus, when the eddy current sensor probe transmits the measurement signal of the electromagnetic coil to the signal processing integrated circuit system, it can also adaptively provide compensated environmental temperature data to be transmitted to the signal processing integrated circuit system, thereby correcting the detection error of the electromagnetic coil of the eddy current sensor probe. At the same time, the linear actuator responsible for the lifting of the sensor head in the eddy current sensor itself, and the potentiometer installed outside the linear actuator motor drive board further strengthens the detection accuracy of the eddy current sensor through the inductive measurement of the electric potential and potential between the potentiometer and the sensor head. Therefore, the role of the eddy current sensor in high-speed small displacement measurement can be exerted to a greater extent. And it can solve the problems that the eddy current sensor needs manual correction and sensitivity marking. It greatly simplifies the production process and expands the application space.

[0004] However, the traditional signal processing integrated circuit system can only process the signal transmitted from the electromagnetic coil of the sensor head of the eddy current sensor itself. Now, the signal processing integrated circuit system must complete the processing of the data signal transmitted by the electromagnetic coil, and at the same time, it must also complete the processing of the data signals transmitted by the temperature measuring thermocouple and the potentiometer, and integrate and judge multiple signals. Then, it controls the opening and closing of the valve on the transmission pipeline orifice through the PLC control device. Therefore, such a signal processing integrated circuit system becomes the key. Summary of the Invention

[0005] The purpose of the present utility model is to provide a signal processing integrated circuit system for a metal liquid level sensor, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above purpose, the present utility model provides the following technical solutions:

[0007] A signal processing integrated circuit system for a metal liquid level sensor, comprising an integrated circuit box body and a main circuit board; a power supply module is provided at the rear side of the integrated circuit box body, and the main circuit board includes a modulation and demodulation main board, a motor and a temperature compensation control board; a first power input terminal is provided on the modulation and demodulation main board, and on the modulation and demodulation main board, the left side of the FPGA chip module is respectively connected to a first digital-to-analog conversion module and a second digital-to-analog conversion module through two main board buses. The first digital-to-analog conversion module is connected to a first gain-adjustable operational amplifier through the main board bus. While the first gain-adjustable operational amplifier is connected to a coaxial cable connection terminal through the main board bus, and further connected to a third gain-adjustable operational amplifier; the second digital-to-analog conversion module is connected to a second gain-adjustable operational amplifier through the main board bus; the second gain-adjustable operational amplifier is connected to the third gain-adjustable operational amplifier through the main board bus. The third gain-adjustable operational amplifier is connected to a phase-shifting transformer through the main board bus, the phase-shifting transformer is connected to an analog-to-digital conversion module through the main board bus, and the analog-to-digital conversion module is connected to the lower side of the FPGA chip module through the main board bus; the lower side of the FPGA chip module is connected to a DA conversion module through another main board bus, and the DA conversion module is connected to a first signal output terminal through the main board bus; the modulation and demodulation main board is provided with a modulation and demodulation main board circuit system, and the power input terminal one of the modulation and demodulation main board circuit system itself is located at the lower left end of the main board; on the motor and temperature compensation control board, a second signal input terminal is provided adjacent to the rear edge of the main board on the right side of the board surface. The second signal input terminal is connected to a temperature difference compensation module through a K-type temperature amplifier via the main board bus; on the upper and lower sides of the board surface of the motor and temperature compensation control board, there are a first power output terminal, a second power output terminal, a first power signal connection terminal, a second signal input terminal, a PLC output terminal and a second power input terminal of the motor and temperature compensation control board circuit system itself; in the middle of the left side of the board surface of the motor and temperature compensation control board, there is an electric push rod telescopic control module. The temperature difference compensation module is connected to the electric push rod telescopic control module through the main board bus. The first power signal connection terminal is connected to an analog addition calculator through a halving ratio adjustment circuit via the main board bus. At the same time, the first power signal connection terminal is also connected to an electric push rod maximum and minimum limit system module through the main board bus. Both the electric push rod maximum and minimum limit system module and the electric push rod telescopic control module are connected to the second power output terminal through the main board bus; the second signal input terminal is connected to a voltage-dividing resistor and a first general operational amplifier in sequence through the main board bus. The temperature difference compensation module is connected to the first general operational amplifier through the main board bus. The first general operational amplifier is connected to an analog adder through the main board bus, and the analog adder is connected to the PLC output terminal through the main board bus; the port of the second signal input terminal itself located on the board surface of the motor and temperature compensation control board is connected to the port of the signal output terminal one located on the side surface of the modulation and demodulation main board itself through a data line; the first power input terminal is connected to the first power output terminal through a power line; the port of the second power output terminal itself located on the motor and temperature compensation control board is connected to the motor inside the upper end of the linear actuator itself above the sensor head through a power line;On the upper right side of the motor and temperature compensation control board, there is a second signal input terminal, which is connected to the temperature measuring thermocouple contained in the sensor head of the metal liquid level sensor through a signal data line; the first power signal connection terminal located on the port of the motor and temperature compensation control board is connected to the potentiometer of the metal liquid level sensor itself through a data line; the port of the PLC output terminal located on the motor and temperature compensation control board passes through the integrated circuit box body through a data line and is connected to the integrated module in the PLC control system box; the coaxial cable connection terminal located on the port of the modulation and demodulation main board is connected to the electromagnetic coil in the sensor head of the metal liquid level sensor itself.

[0008] Inside the integrated circuit box body, the second power output terminal located on the motor and temperature compensation control board is connected to the motor inside the upper electric cylinder of the linear actuator through a power line. The motor makes the electric push rod located inside the electric cylinder extend downward or retract into the electric cylinder through the structure of the gear mechanism and the fast driving bolt; on the right side of the motor and temperature compensation control board, close to the rear edge of the main board, there are two or more second signal input terminals. The sensor head of the metal liquid level sensor itself contains two or more temperature measuring thermocouples. Each port of the second signal input terminal located on the motor and temperature compensation control board is connected to the corresponding temperature measuring thermocouple in the sensor head of the metal liquid level sensor itself through a signal data line; the port of the first power signal connection terminal located on the motor and temperature compensation control board is connected to the potentiometer located above the sensor head of the metal liquid level sensor itself through a data line. The lower ends of both the linear actuator and the potentiometer are connected to the upper end of the sensor head; the port of the PLC output terminal located on the motor and temperature compensation control board passes through the integrated circuit box body through a data line and is connected to the integrated module in the PLC control system box.

[0009] Both the linear actuator and the potentiometer are arranged in the vertical direction. The rod body of the potentiometer is a telescopic structure. The upper end of the linear actuator is fixed inside the upper right frame fixing bracket of the integrated circuit box body. The upper end of the rod body of the potentiometer is fixed outside the fixing bracket. The linear actuator includes an electric cylinder. The lower end of the push rod extending downward from the electric cylinder and the lower end detection head of the rod body of the potentiometer are both inserted into the upper end of the sensor head and fixed; the data line of the potentiometer itself extends from the upper end of the rod body of the potentiometer into the integrated circuit box body, and then is connected to the port of the first power signal connection terminal located on the motor and temperature compensation control board; on the right side of the lower end of the integrated circuit box body, there is a square tube extending vertically downward. The lower end of the square tube is open. The upper end of the square tube is communicated with the lower end of the integrated circuit box body. The sensor head is located at the open end of the lower end of the square tube.

[0010] The electromagnetic coil contained in the sensor head of the metal liquid level sensor itself is formed by winding the same metal wire, and the outer side of the metal wire is coated with enameled wire; the coaxial cable connection end includes a connection end 1 and a connection end 2, and the connection end 1 and the connection end 2 of the coaxial cable connection end are located on the board of the modulation and demodulation main board, respectively connected to the head and tail ends of the metal wire constituting the electromagnetic coil in the sensor head of the metal liquid level sensor itself through the wire 1 and the wire 2 in the coaxial cable, wherein the coaxial cable wire 1 is connected to the bus between the gain adjustable operational amplifier 1 and the gain adjustable operational amplifier 3 through the connection end 1 of the coaxial cable connection end, and the coaxial cable wire 2 is connected to the ground wire after being connected to the connection end 2 of the coaxial cable connection end; the upper side of the motor and temperature compensation control board is provided with a power input terminal 1, a power output terminal 2, a power signal connection terminal 1, a signal input terminal 2, and a signal output terminal 3, and the lower side of the motor and temperature compensation control board is provided with a PLC output terminal and a power input terminal 2 of the motor and temperature compensation control board circuit system itself.

[0011] The temperature difference compensation module of the motor and the temperature compensation control board itself contains a temperature indication system, which is connected to the PLC output end through the main board bus of the motor and the temperature compensation control board itself, and then through the port of the PLC output end itself located on the surface of the motor and the temperature compensation control board through the data line through the integrated circuit box and the temperature display and temperature alarm provided on the integrated module in the PLC control system box; the half-ratio adjustment circuit on the motor and the temperature compensation control board includes a voltage divider resistor and a common operational amplifier 2, and the power signal connection terminal 1 is connected to the analog adder through the main board bus via the voltage divider resistor and the common operational amplifier 2.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] First of all, the signal processing integrated circuit system's motor and temperature compensation control board can convert the AC analog data signal transmitted by the electromagnetic coil into a digital DC signal, which is then processed by the FPGA chip module and then converted back into a DC analog digital signal. At the same time, the temperature difference compensation module also completes the processing of the DC analog data signal transmitted by the electromagnetic coil and the temperature measuring electrode, and combines the two signals together for summary and judgment, which can be used to roughly judge the distance between the metal melt level and the bottom of the sensor head. This process of converting the AC analog data signal of the electromagnetic coil into a digital DC signal and processing the signal data by the FPGA chip module makes the metal level detector more accurate in calculating the detection data of the metal melt level.

[0014] Secondly, the motor and temperature compensation control board of the signal processing integrated circuit system itself can process the data signals transmitted by the electromagnetic coil, and at the same time process the data signals transmitted by the thermocouple. It synthesizes the two signals to judge the height of the molten metal liquid level. After further integrating the data signals transmitted by the potentiometer, it transmits the final analysis result to the PLC control device, and controls the opening and closing of the valve on the transmission pipeline through the PLC control device. Such data that has undergone multiple integrations, calculations, and corrections is more accurate. The use of the potentiometer significantly expands the measurement accuracy of the sensor head. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of the main body of the circuit board of a signal processing integrated circuit system of a metal liquid level sensor of the present invention;

[0016] Figure 2 It is a position structure diagram of each module and circuit system of the motor and temperature compensation control board itself and a circuit operation diagram of the motor and temperature compensation control board itself in the working state in a signal processing integrated circuit system of a metal liquid level sensor of the present invention; DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention. In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "upper and lower", "top", "bottom", "inner", "outer", "left and right", "front and rear", "bottom end", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0018] Please refer to the legend. In the embodiment of the present utility model, a signal processing integrated circuit system for a metal liquid level sensor includes an integrated circuit box body and a main circuit board. A power module is provided at the rear side of the integrated circuit box body. The main circuit board includes a modulation and demodulation main board, a motor and a temperature compensation control board. The modulation and demodulation main board is provided with a first power input terminal. On the modulation and demodulation main board, the left side of the FPGA chip module is connected to a first digital-to-analog conversion module and a second digital-to-analog conversion module respectively through two main board buses. The first digital-to-analog conversion module is connected to a first gain-adjustable operational amplifier through the main board bus. While the first gain-adjustable operational amplifier is connected to a coaxial cable connection end through the main board bus, and further connected to a third gain-adjustable operational amplifier. The second digital-to-analog conversion module is connected to a second gain-adjustable operational amplifier through the main board bus. The second gain-adjustable operational amplifier is connected to the third gain-adjustable operational amplifier through the main board bus. The third gain-adjustable operational amplifier is connected to a phase-shifting transformer through the main board bus. The phase-shifting transformer is connected to an analog-to-digital conversion module through the main board bus. The analog-to-digital conversion module is connected to the lower side of the FPGA chip module through the main board bus. The lower side of the FPGA chip module is connected to a DA conversion module through another main board bus. The DA conversion module is connected to a first signal output terminal through the main board bus. The modulation and demodulation main board is provided with a modulation and demodulation main board circuit system. The power input terminal of the modulation and demodulation main board circuit system itself is located at the lower left end of the main board. On the motor and temperature compensation control board, a second signal input terminal is provided adjacent to the rear edge of the main board on the right side. The second signal input terminal is connected to a temperature difference compensation module through a K-type temperature amplifier via the main board bus. Power output terminals one and two, a power signal connection terminal one, a signal input terminal two, a PLC output terminal, and a power input terminal two of the motor and temperature compensation control board circuit system itself are provided on the upper and lower sides of the motor and temperature compensation control board. An electric push rod telescopic control module is provided in the middle of the left side of the motor and temperature compensation control board. The temperature difference compensation module is connected to the electric push rod telescopic control module through the main board bus. The power signal connection terminal one is connected to an analog addition calculator through a half-ratio adjustment circuit via the main board bus. At the same time, the power signal connection terminal one is also connected to the electric push rod maximum and minimum limit system module through the main board bus. Both the electric push rod maximum and minimum limit system module and the electric push rod telescopic control module are connected to the power output terminal two through the main board bus. The second signal input terminal is connected to a voltage-dividing resistor and a first general operational amplifier in sequence through the main board bus. The temperature difference compensation module is connected to the first general operational amplifier through the main board bus. The first general operational amplifier is connected to an analog adder through the main board bus. The analog adder is connected to the PLC output terminal through the main board bus. The port of the second signal input terminal itself on the motor and temperature compensation control board is connected to the port of the signal output terminal on the side of the modulation and demodulation main board through a data line. The first power input terminal is connected to the first power output terminal through a power line. The port of the second power output terminal itself on the motor and temperature compensation control board is connected to the motor inside the upper end of the linear actuator above the sensor head through a power line.On the upper right side of the upper side of the motor and temperature compensation control board, there is a second signal input terminal, which is connected to the temperature measuring thermocouple contained in the sensor head of the metal liquid level sensor itself through a signal data line; one power signal connection terminal is located on the port on the motor and temperature compensation control board itself and is connected to the potentiometer of the metal liquid level sensor itself through a data line; the port of the PLC output terminal located on the motor and temperature compensation control board itself passes through the integrated circuit box body through a data line and is connected to the integrated module in the PLC control system box; the coaxial cable connection terminal located on the modulation and demodulation main board port is connected to the electromagnetic coil in the sensor head of the metal liquid level sensor itself through a coaxial cable; the function of the metal liquid level detector signal processing integrated circuit system is that the signal processing integrated circuit system combines the data transmitted by the temperature measuring thermocouple and the electromagnetic coil to assist the PLC program in controlling the opening and closing of the metal melt feeding pipeline.;

[0019] Inside the integrated circuit box body, the port of the second power output terminal located on the motor and temperature compensation control board itself is connected to the motor inside the upper electric cylinder body of the linear actuator through a power line. The motor makes the electric push rod located inside the electric cylinder extend downward or retract into the electric cylinder through the structure of the gear mechanism and the fast drive bolt; on the right side of the motor and temperature compensation control board, adjacent to the rear edge of the main board, there are two or more second signal input terminals. The sensor head of the metal liquid level sensor itself contains two or more temperature measuring thermocouples. Each port of the second signal input terminal located on the motor and temperature compensation control board itself is connected to the corresponding temperature measuring thermocouple in the sensor head of the metal liquid level sensor itself through a signal data line; the port of the first power signal connection terminal located on the motor and temperature compensation control board itself is connected to the potentiometer located above the sensor head of the metal liquid level sensor itself through a data line. The lower ends of both the linear actuator and the potentiometer are connected to the upper end of the sensor head; the port of the PLC output terminal located on the motor and temperature compensation control board itself passes through the integrated circuit box body through a data line and is connected to the integrated module in the PLC control system box.

[0020] Both the linear actuator and the potentiometer are arranged in the up and down direction. The rod body of the potentiometer itself is a telescopic structure. The upper end of the linear actuator is fixed inside the upper right frame fixing bracket of the integrated circuit box body. The upper end of the rod body of the potentiometer itself is fixed outside the fixing bracket. The linear actuator includes an electric cylinder body. The lower end of the push rod extending downward from the electric cylinder body and the lower end detection head of the rod body of the potentiometer itself are inserted into and fixed to the upper end of the sensor head; the data line of the potentiometer itself extends from the upper end of the rod body of the potentiometer itself into the integrated circuit box body and is then connected to the port of the first power signal connection terminal located on the motor and temperature compensation control board; on the right side of the lower end of the integrated circuit box body, there is a square tube extending vertically downward. The lower end of the square tube is open. The upper end of the square tube is communicated with the lower end of the integrated circuit box body. The sensor head is located at the open end of the lower end of the square tube.

[0021] The electromagnetic coil contained in the sensor head of the metal liquid level sensor itself is formed by winding the same metal wire, and the outer side of the metal wire is coated with enameled wire; the coaxial cable connection end includes a connection end 1 and a connection end 2, and the connection end 1 and the connection end 2 of the coaxial cable connection end are located on the board of the modulation and demodulation main board, respectively connected to the head and tail ends of the metal wire constituting the electromagnetic coil in the sensor head of the metal liquid level sensor itself through the wire 1 and the wire 2 in the coaxial cable, wherein the coaxial cable wire 1 is connected to the bus between the gain adjustable operational amplifier 1 and the gain adjustable operational amplifier 3 through the connection end 1 of the coaxial cable connection end, and the coaxial cable wire 2 is connected to the ground wire after being connected to the connection end 2 of the coaxial cable connection end; the upper side of the motor and temperature compensation control board is provided with a power input terminal 1, a power output terminal 2, a power signal connection terminal 1, a signal input terminal 2, and a signal output terminal 3, and the lower side of the motor and temperature compensation control board is provided with a PLC output terminal and a power input terminal 2 of the motor and temperature compensation control board circuit system itself. In this section, the purpose of connecting the electromagnetic coil to the ground wire is to reduce electromagnetic radiation, isolate noise sources, cut off noise propagation paths, and reduce interference in the circuit through proper grounding strategies, thereby ensuring the normal operation of the eddy current sensor and improving measurement accuracy.

[0022] The temperature difference compensation module of the motor and the temperature compensation control board itself contains a temperature indication system, which is connected to the PLC output end through the main board bus of the motor and the temperature compensation control board itself, and then through the port of the PLC output end itself located on the surface of the motor and the temperature compensation control board through the data line through the integrated circuit box and the temperature display and temperature alarm provided on the integrated module in the PLC control system box; the half-ratio adjustment circuit on the motor and the temperature compensation control board includes a voltage divider resistor and a common operational amplifier 2, and the power signal connection terminal 1 is connected to the analog adder through the main board bus via the voltage divider resistor and the common operational amplifier 2.

[0023] The working principle of the present utility model is as follows: The main purpose of the metal liquid level sensor is to be used in the pouring of molten metal in a metal smelting plant. When pouring molten metal into a mold, the metal liquid level sensor is required to detect the height of the molten metal poured into the mold in real time, so as to control the stop of pouring through the PLC device when the required height is reached; The signal processing integrated circuit system of the metal liquid level sensor is in the metal liquid level detector and is an important unit for mainly performing core analysis and calculation; The signal processing integrated circuit system of the metal liquid level sensor includes a motor and a temperature compensation control board and a modulation and demodulation main board. Among them, the modulation and demodulation main board is provided with modules including an FPGA chip module, a digital-to-analog conversion module 1, a digital-to-analog conversion module 2, an analog-to-digital conversion module, a gain-adjustable operational amplifier 1, a gain-adjustable operational amplifier 2, a gain-adjustable amplifier 3, a coaxial cable connection end, a power input terminal 1, a signal output terminal 1, a phase-shifting transformer, a DA conversion module, etc. In actual work, the power input terminal 2 of the motor and the temperature compensation control board itself is powered by being connected to the power module at the rear side of the integrated circuit box body, and the motor and the temperature compensation control board supply power to the modulation and demodulation main board through the power line between the power output terminal 1 of itself and the power input terminal 1 of the modulation and demodulation main board; The FPGA chip module provides a DDS digital signal, and the digital-to-analog conversion 1 and the digital-to-analog conversion 2 simultaneously convert the DDS DC digital signal input from the FPGA into an analog alternating current signal. Among them, the analog alternating current signal output by the digital-to-analog conversion module 1 is transmitted through the gain-adjustable operational amplifier 1 on the modulation and demodulation main board and the connection terminal 1 of the coaxial cable connection end on the modulation and demodulation main board to the internal wire 1 of the coaxial cable itself connected to the coaxial cable connection end. One end of the metal wire that forms an electromagnetic coil in the sensor head of the metal liquid level sensor itself is connected to the internal wire 1 of the coaxial cable. The purpose is to induce reactance through the electromagnetic coil, combine the reactance signal induced by the electromagnetic coil onto the analog alternating current signal, and transmit it back to the coaxial cable wire 1 through one end of the electromagnetic coil. Then, the coaxial cable wire 1 is transmitted through the connection 1 of the coaxial cable connection end of the modulation and demodulation main board to the main board bus connected between the gain-adjustable operational amplifier 1 and the gain-adjustable amplifier 3, and finally transmitted to the analog-to-digital conversion module through the gain-adjustable operational amplifier 3 and the phase-shifting transformer. The analog-to-digital conversion module converts the alternating current into direct current and converts the analog signal into a digital signal and then transmits it to the FPGA chip module; Among them, the analog alternating current signal output by the digital-to-analog conversion module 2 is transmitted to the analog-to-digital conversion module through the gain-adjustable operational amplifier 2, the gain-adjustable operational amplifier 3, and the phase-shifting transformer on the modulation and demodulation main board. The analog-to-digital conversion module converts the alternating current into a direct current digital signal and then transmits it to the FPGA chip module; The FPGA chip module processes the signals transmitted above and then transmits them to the DA conversion module on the modulation and demodulation main board. The DA conversion module converts the DC digital signal transmitted by the FPGA chip module into a DC analog signal and transmits the DC analog signal through the main board bus to the signal output terminal 1 on the modulation and demodulation main board;Among them, first, the analog alternating current signal output by the digital-to-analog conversion module two passes through the gain-adjustable operational amplifier two, the gain-adjustable operational amplifier three, the phase-shifting transformer, and the analog-to-digital conversion module (the analog-to-digital conversion module converts alternating current into direct current and converts the analog signal into a digital signal) on the modulation and demodulation main board, and then is transmitted to the FPGA chip module. After the analog alternating current signal output by the digital-to-analog conversion module one is combined with the reactance signal transmitted from the coaxial cable wire one of the sensor head electromagnetic coil and the coaxial cable connection end of the modulation and demodulation main board through the gain-adjustable operational amplifier one connected by the main board bus on the modulation and demodulation main board, it is then transmitted to the gain-adjustable amplifier three through the main board bus of the modulation and demodulation board, and finally transmitted to the analog-to-digital conversion module through the gain-adjustable operational amplifier three and the phase-shifting transformer on the main board bus. The analog-to-digital conversion module converts alternating current into direct current and converts the analog signal into a digital signal and then transmits it to the FPGA chip module. The analog signals output by the above digital-to-analog conversion module one and the digital-to-analog conversion module two are finally transmitted back to the FPGA chip module. The purpose of this setting is signal normalization; in the above analog signal transmission, the role of the gain amplifier is to increase or decrease the amplitude of the alternating current voltage wave. Increasing the amplitude of the alternating current wave is beneficial to the detection sensitivity of the sensor head electromagnetic coil, while decreasing the amplitude of the alternating current voltage wave is to cooperate with the phase-shifting transformer to adjust the alternating current to the voltage amplitude acceptable to the analog-to-digital conversion module and the FPGA chip module; in the above signal transmission process, when converting the digital signal into an analog signal, the direct current is also converted into alternating current, both of which are for the convenience of the sensor head electromagnetic coil of the metal liquid level sensor to detect the metal melt liquid level requirements. And the data obtained by the electromagnetic coil detection is finally adjusted back to the voltage amplitude through the gain-adjustable operational amplifier three and the phase-shifting transformer, and then re-converted into a digital signal by the analog-to-digital conversion module and converted into direct current at the same time for the convenience of the FPGA chip module to calculate. The FPGA chip module only accepts digital signals and direct current; the digital signal transmitted by the FPGA chip module to the DA conversion module after calculating the received signal is converted into an analog signal by the DA conversion module and then transmitted to the signal output terminal one on the modulation and demodulation main board, and then transmitted to the signal input terminal two port of the motor and temperature compensation control board itself through the port of the signal output terminal two on the modulation and demodulation main board through the data line.;

[0024] In the motor and temperature compensation control board of the metal liquid level sensor signal processing integrated circuit system, there are a signal input terminal 2, a K-type temperature amplifier, a power output terminal 2, a power signal connection terminal 1, a power output terminal 1, a signal input terminal 2, a PLC output terminal, an electric boost rod maximum and minimum limit system module, an electric push rod extension and retraction control module, an analog adder module, a temperature difference compensation module, and a halving ratio adjustment circuit; First, the signal output terminal 1 of the modulation and demodulation main board transmits the DC analog signal transmitted by the FPGA chip module of the modulation and demodulation main board through the DA conversion module through the port of the signal output terminal 1 itself located on the modulation and demodulation main board and the data line connected to the port to the signal input terminal 2 port on the motor and temperature compensation control board, and then the signal input terminal 2 transmits it to the input terminal of the general operational amplifier 1 through the voltage dividing resistor of the main board bus; The temperature measuring thermocouple used to measure the temperature of the electromagnetic coil in the sensor head of the metal liquid level sensor itself transmits the measured data to the port of the signal input terminal 2 of the motor and temperature compensation control board in the form of a DC analog signal. The signal input terminal 2 of the motor and temperature compensation control board transmits the DC analog signal to the K-type temperature amplifier through the main board bus, and then the K-type temperature amplifier transmits it to the temperature difference compensation module. The temperature difference compensation module transmits the DC analog signal to the input terminal 2 of the general proportional amplifier. The general proportional amplifier analyzes, combines and calculates the DC analog signals transmitted from both the signal input terminal 2 and the temperature difference compensation module to generate a new DC analog signal. The new DC analog signal is transmitted from the output terminal 2 of the general proportional amplifier to the analog adder module through the main board bus; The linear actuator and potentiometer located above the sensor head of the metal liquid level sensor itself, where the upper end of the linear actuator is fixed inside the square fixing frame. After the power cord connected to the internal motor at the upper end of the linear actuator passes through the square fixing frame, it is connected to the port of the power output terminal 2 of the motor and temperature compensation control board; And the rod body of the potentiometer itself is a telescopic rod. The lower end of the telescopic rod of the potentiometer itself is fixed inside the upper end of the sensing head. The potentiometer transmits the data measured by its own detection head to the port of the power signal connection terminal 1 of the motor and temperature compensation control board in the form of a DC analog data signal through the data line connected to the upper end of the potentiometer, and then the power signal connection terminal 1 transmits it to the analog adder module through the halving ratio adjustment circuit on the main board bus. At the same time, the power signal connection terminal 1 also transmits the DC analog data signal to the electric push rod maximum and minimum limit system module through the main board bus. The temperature difference compensation module also transmits the DC analog data signal obtained from the K-type temperature amplifier of the motor and temperature compensation control board to the electric push rod extension and retraction control module. The electric push rod extension and retraction control module and the electric push rod maximum and minimum limit system module simultaneously control the output mode and output magnitude of the current power of the power output terminal of the motor and temperature compensation control board;The analog adder module adds the DC analog signal obtained from the ordinary proportional amplifier two and the analog data signal obtained from the power signal connection terminal one, and the calculated result is directly transmitted to the output terminal of the motor and temperature compensation control board PLC in the form of an analog data signal through the main board bus by the analog adder module. The port of the PLC output terminal itself located on the motor and temperature compensation control board transmits the analog data signal through the data line out of the integrated circuit box of the metal liquid level sensor signal processing integrated system and is connected to the PLC control device; in this paragraph of description, the K-type temperature amplifier contains a temperature measurement calculation chip, whose function is to assist the temperature difference compensation module in data processing.;

[0025] The above is a description of the data signal transmission path in a signal processing integrated circuit system of a metal liquid level sensor of the present utility model. The function of the modulation and demodulation main board is to analyze and process and assist the metal liquid level sensor itself to measure the alternating current analog data signal of the metal melt liquid level in actual work by the electromagnetic coil of the sensor head, and convert this data signal into a direct current digital signal. After being processed by the FPGA chip module, it is then converted into a direct current analog signal by the DA conversion module, and then transmitted from a signal output terminal - a port on the modulation and demodulation main board - to the signal input terminal two port of the motor and temperature compensation control board through a data line. Then, the motor and temperature compensation control board transmits the data signal from the signal input terminal two to a general proportional amplifier one; at the same time, the temperature measuring thermocouple in the sensor head of the metal liquid level sensor also transmits the measured data as a direct current analog data signal to the signal input terminal one of the motor and temperature compensation control board through a data line. Then, it is transmitted into the temperature difference compensation module through the K-type temperature amplifier from the signal input terminal one, and then transmitted to the electric push rod extension and retraction control module by the temperature difference compensation module. At the same time, the temperature difference compensation module also transmits this direct current analog signal to the general proportional amplifier one; then, the electric push rod extension and retraction control module controls the positive and negative conversion of the current at the power output terminal two, so as to achieve the forward and reverse rotation control of the main shaft of the linear actuator motor, and further realize the control of the upward contraction and downward fall of the push rod of the linear actuator itself, and drive the sensor head of the metal liquid level sensor to rise or fall through the push rod of the linear actuator itself; at the same time, the general proportional amplifier one combines and calculates the direct current analog signals transmitted from both the temperature difference compensation module and the signal input terminal one and then transmits them to the analog adder module. The analog adder module also obtains the direct current analog data signal measured by the potentiometer transmitted from the power signal connection terminal one at the same time. The analog adder adds and calculates the data measured by the potentiometer and the detected value data transmitted from the general proportional amplifier one to the analog adder module, and obtains the final result. Then, the analog adder transmits the final result data in the form of an analog data signal to the PLC output terminal, and then transmits it from the port on the motor and temperature compensation control board at the PLC output terminal to the PLC control device through a data line; finally, the power signal connection terminal one on the motor and temperature compensation control board also transmits the analog data signal transmitted by the potentiometer to the electric push rod highest and lowest limit system module at the same time, and the electric push rod highest and lowest limit system module controls the current output power limit of the power output terminal two through the main board bus. The electric push rod highest and lowest limit system module is to control the lowest position of the push rod of the linear actuator itself extending downward and the highest limit of rising upward. Its function is to limit the electric push rod extension and retraction control module, and avoid the push rod of the linear actuator itself contracting upward and falling downward beyond the lowest position and the highest limit range under the control of the electric push rod extension and retraction control module, so as to form an overload.

[0026] The above are only the preferred specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, makes equivalent substitutions or changes, and should be covered within the protection scope of the present utility model.

Claims

1. A signal processing integrated circuit system for a metal liquid level sensor, characterized in that: It includes an integrated circuit box and a circuit board body; a power module is arranged at the rear side of the integrated circuit box, and the circuit board body includes a modulation and demodulation main board, a motor and a temperature compensation control board; the modulation and demodulation main board is provided with a power input terminal 1, and the left side of the FPGA chip module arranged on the modulation and demodulation main board is respectively connected with a digital-to-analog conversion module 1 and a digital-to-analog conversion module 2 through two main board buses; the digital-to-analog conversion module 1 is connected with a gain-adjustable operational amplifier 1 through the main board bus, and the gain-adjustable operational amplifier 1 is connected to a coaxial cable connection terminal through the main board bus, and is further connected to a gain-adjustable operational amplifier 3; the digital-to-analog conversion module 2 is connected with a gain-adjustable operational amplifier 2 through the main board bus; the gain-adjustable operational amplifier 2 is connected with the gain-adjustable operational amplifier 3 through the main board bus, and the gain-adjustable operational amplifier 3 is connected to the coaxial cable connection terminal through the main board bus. The modulation operational amplifier 3 is connected to the phase-shifting transformer via the mainboard bus, the phase-shifting transformer is connected to the analog-to-digital conversion module via the mainboard bus, the analog-to-digital conversion module is connected to the lower side of the FPGA chip module via the mainboard bus; the lower side of the FPGA chip module is connected to the DA conversion module via another mainboard bus, the DA conversion module is connected to the signal output terminal 1 via the mainboard bus; the modulation and demodulation mainboard is provided with a modulation and demodulation mainboard circuit system, and the power input terminal 1 of the modulation and demodulation mainboard circuit system itself is located at the lower left end of the mainboard; the signal input terminal 2 is provided on the right side of the motor and temperature compensation control board, close to the rear edge of the mainboard, and the signal input terminal 2 is connected to the temperature difference compensation module via the mainboard bus via the K-type temperature amplifier; the motor and temperature compensation control board is provided with power output terminal 1 and power output terminal 2 on the upper and lower sides of the board , power signal connection terminal one, signal input terminal two, PLC output terminal and power input terminal two of the motor and temperature compensation control board circuit system itself; an electric push rod telescopic control module is arranged in the middle of the left side of the motor and temperature compensation control board panel, the temperature difference compensation module is connected to the electric push rod telescopic control module via the main board bus, the power signal connection terminal one is connected to the analog adder through the main board bus through the half-proportional adjustment circuit, at the same time, the power signal connection terminal one is also connected to the electric push rod maximum and minimum limit system module through the main board bus, the electric push rod maximum and minimum limit system module and the electric push rod telescopic control module are all connected to the power output terminal two through the main board bus; the signal input terminal two is connected to the voltage divider resistor and the ordinary operational amplifier one in sequence through the main board bus, and the temperature difference compensation module is connected to the main board through the main board The bus is connected to a common operational amplifier 1, the common operational amplifier 1 is connected to an analog adder via the mainboard bus, and the analog adder is connected to a PLC output terminal via the mainboard bus; the signal input terminal 2 itself is located on the motor and the temperature compensation control board, and is connected to a signal output terminal 1 port provided on the side of the modulation and demodulation mainboard itself through a data line; the power input terminal 1 is connected to the power output terminal 1 through a power line; the power output terminal 2 itself is located on the motor and the temperature compensation control board, and is connected to the motor located inside the upper end of the linear actuator itself above the sensor head through a power line; the signal input terminal 2 provided on the right side of the upper side of the motor and the temperature compensation control board is connected to the temperature measuring electrode contained in the sensor head of the metal liquid level sensor itself through a signal data line;The power signal connection end is located on the motor and the temperature compensation control board, and is connected to the potentiometer of the metal level sensor through a data line; the PLC output end is located on the motor and the temperature compensation control board, and is connected to the integrated module in the PLC control system box through a data line through the integrated circuit box; the coaxial cable connection end is located on the modem mainboard port, and is connected to the electromagnetic coil in the sensor head of the metal level sensor through a coaxial cable. ; 2. The signal processing integrated circuit system of the metal liquid level sensor according to claim 1, characterized in that: In the integrated circuit box, the power output terminal 2 itself is located at the port on the motor and the temperature compensation control board, and is connected to the motor in the electric cylinder body at the upper end of the linear actuator itself through the power line. The motor uses the gear mechanism and the structure of the quick drive bolt to make the electric push rod in the electric cylinder body extend downward from the electric cylinder body or retract into the electric cylinder body; two or more signal input terminals 2 are provided on the right side of the motor and the temperature compensation control board surface, close to the rear edge of the main board. The sensor head of the metal liquid level sensor itself contains two or more temperature measuring electrodes. Each signal input terminal 2 itself is located at the port on the motor and the temperature compensation control board surface, and is connected to the corresponding temperature measuring electrode in the sensor head of the metal liquid level sensor itself through a signal data line; the power signal connection terminal 1 itself is located at the port on the motor and the temperature compensation control board surface, and is connected to the potentiometer located above the sensor head of the metal liquid level sensor itself through a data line, and the lower ends of the linear actuator and the potentiometer are connected to the upper end of the sensor head; the PLC output terminal itself is located at the port on the motor and the temperature compensation control board surface, and is connected to the integrated module in the PLC control system box through a data line passing through the integrated circuit box.

3. The signal processing integrated circuit system of the metal liquid level sensor according to claim 2, characterized in that: Both the linear actuator and the potentiometer are arranged in the up-down direction. The rod of the potentiometer itself is a telescopic structure. The upper end of the linear actuator itself is fixed in the upper frame fixing frame on the right side inside the integrated circuit box, and the upper end of the rod of the potentiometer itself is fixed on the outside of the fixing frame. The linear actuator includes an electric cylinder body. The lower end of the push rod extending downward from the electric cylinder body and the detection head at the lower end of the rod of the potentiometer itself are inserted into the upper end of the sensor head and fixed; the data line of the potentiometer itself extends from the upper end of the rod of the potentiometer itself into the integrated circuit box, and then is connected to the power signal connection end, a port located on the motor and temperature compensation control board; a square tube extending vertically downward is provided on the right side of the lower end of the integrated circuit box, the lower end of the square tube is open, the upper end of the square tube is connected with the lower end of the integrated circuit box, and the sensor head is located at the opening at the lower end of the square tube.

4. The signal processing integrated circuit system of the metal liquid level sensor according to claim 1, characterized in that: The electromagnetic coil contained in the sensor head of the metal liquid level sensor itself is wound with the same metal wire, and the outer side of the metal wire is coated with enameled wire; the coaxial cable connection end includes connection end 1 and connection end 2, and the connection end 1 and connection end 2 of the coaxial cable connection end are located on the board of the modulation and demodulation main board, respectively connected to the head and tail ends of the metal wire constituting the electromagnetic coil in the sensor head of the metal liquid level sensor itself through the wire 1 and the wire 2 in the coaxial cable, wherein the coaxial cable wire 1 is connected to the bus between the gain adjustable operational amplifier 1 and the gain adjustable operational amplifier 3 through the connection end 1 of the coaxial cable connection end, and the coaxial cable wire 2 is connected to the ground wire after being connected to the connection end 2 of the coaxial cable connection end; the upper side of the motor and temperature compensation control board is provided with a power input terminal 1, a power output terminal 2, a power signal connection terminal 1, a signal input terminal 2, and a signal output terminal 3, and the lower side of the motor and temperature compensation control board is provided with a PLC output terminal and a power input terminal 2 of the motor and temperature compensation control board circuit system itself.

5. The signal processing integrated circuit system of the metal liquid level sensor according to claim 1, characterized in that: The temperature difference compensation module of the motor and the temperature compensation control board itself contains a temperature indication system. The temperature indication system is connected to the PLC output end through the main board bus of the motor and the temperature compensation control board itself, and then through the port located on the surface of the motor and the temperature compensation control board of the PLC output end itself, through the data line through the integrated circuit box and the temperature display and temperature alarm provided on the integrated module in the PLC control system box; the half-ratio adjustment circuit on the motor and the temperature compensation control board includes a voltage divider resistor and a common operational amplifier 2, and the power signal connection terminal 1 is connected to the analog adder through the main board bus via the voltage divider resistor and the common operational amplifier 2.

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