Measuring & Analyzing Instruments

Shengda water meter CO.,LTD focus On R&D And Produce Mechanical Water Meter, Smart Water Meter,Ultrasonic water meter and flow meter since 1995,we not only produce water meter,also offer total solution of smart water meter reading,support OEM/ODM. Supply condition Size:DN15-DN50 (DN50~DN300,please check bulk water meter) Body:Brass/iron/stainless steel/plastic/Nylon(optional) Type:Dry dial/wet dial(optional) Max work pressure:PN16/PN10(optional) Pressure loss:≤0.063Mpa Water temperature:T30,T50,T90(optional) Standards:ISO , 4064.class B R:R80/R100/R160(R=Q3/Q1)(optional) Install , :Horizontal use/Vertical use We can offer the multi jet water meter with body materails as follows: Cast iron water meter,ABS water meter,Nylon water meter,stainless steel water meter and brass body water meter with R160. Contact person : Miranda Office Email: admin(at)henanpanda(dot)com WhatsApp:+86 18603780816 SHENGDA water meter CO.,LTD

Minimum Order: 1 bags

Shengda water meter CO.,LTD focus On R&D And Produce Mechanical Water Meter, Smart Water Meter,Ultrasonic water meter and flow meter since 1995,we not only produce water meter,also offer total solution of smart water meter reading,support OEM/ODM. Supply condition Size:DN15,DN20 Body:Brass/plastic( , optional) Max work pressure:PN16 Pressure loss:≤0.063Mpa Water temperature:T30,T50 Standards:ISO4064.Class C R:R160(R=Q3/Q1) Install:Horizontal, Vertical or inclined Connection method: BSP Thread the water meter body can be choose brass,brass with primer and ABS. Contact person : Miranda Office Email: admin(at)henanpanda(dot)com WhatsApp:+86 18603780816 SHENGDA water meter CO.,LTD

Minimum Order: 1 bags

Shengda water meter CO.,LTD focus On R&D And Produce Mechanical Water Meter, Smart Water Meter,Ultrasonic water meter and flow meter since 1995,we not only produce water meter,also offer total solution of smart water meter reading,support OEM/ODM. Supplied condition： Size:DN50~DN600 R:R25,R40 Ma , terial: Cast iron shell Temperature grade: T30, T50, T90 Pressure class: MAP16, MAP10.MAP40 Pressure loss: △P63 Installation method: 1. Horizontal installation. 2. Additional water filter is required. 3. The water inlet / outlet of the water meter needs straight pipe section U10 / D5. Please check our irrigation water meter solution. Contact person : Miranda Office Email: admin(at)henanpanda(dot)com WhatsApp:+86 18603780816 SHENGDA water meter CO.,LTD

Minimum Order: 1 bags

GENERAL FEATURES: LCD display screen. Titration methods, curves and results are displayed in detail. Volumetric KF Titration and Coulometric KF Titration are supported. Data analysis feature helps user review and compare results. Data can be easily transferred to printer via RS-232 communication interface. Reset feature automatically resumes all settings back to factory default options. Volumetric Karl Fischer Titration: Support KF Titration Mode and Titer Detection Mode. Features of auto-filling, auto-purging and auto-mixing of the reagents ensure safe handling of Karl Fischer chemicals. Automatic/manual background drift correction ensures accurate results. Selectable units including mg, mg/L, %, ppm, etc. Settable parameters, including measurement unit, polarization current, stirring rate, titration rate, stop volume, endpoint potential, stop criterion and etc. Store up to 200 titration data sets (GLP-compliant). Coulometric Karl Fischer Titration: Generator cell with diaphragm. Automatic/manual background drift correction ensures accurate results. Selectable units including μg, mg, %, ppm, mg/L, μg/mL, etc. Settable parameters, including measurement unit, polarization current, stirring rate, generator current, endpoint potential, stop criterion and etc. Store up to 200 titration data sets (GLP-compliant).

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Overview: In the steelmaking production process, the ladle is the key equipment for holding molten steel, secondary refining, and continuous pouring. In a modern steelmaking plant, refractory materials are required for converters, refining, and ladles. In the steelmaking process, ladle is the most important part in the use and consumption of refractory materials. Improving the service life of ladles and reducing refractory consumption is the key technology for steelmaking plants to save costs and reduce energy consumption for green production. In order to ensure the orderly operation of the ladle, save the consumption of refractory materials, prolong the service life of the ladle, and ensure the safe operation of the ladle, Wuhan CenterRise M&C Engineering CO. developed and launched the LDT-N200 integrated management system for the ladle. Introduction: LDT-N200 ladle integrated management system integrates LDT-L200 ladle lining thickness gauge, TBP-S300 ladle, tundish baking temperature and leakage monitoring system, RFD -C100 metallurgical electronic positioning system, and also integrates SQL Server database and NeuralWare (American computer software company) neural network software NeuralWorks to realize intelligent and optimized management of ladles. LDT-L200 ladle lining thickness gauge uses a laser area array scanning sensor to accurately measure the real-time thickness of the ladle lining, calculate the lining loss, and predict the service life of the ladle. TBP-S300 ladle, tundish baking temperature and leakage monitoring system uses infrared thermal imaging camera and embedded armor wire system to comprehensively monitor and prevent ladle leakage. RFD-C100 metallurgical electronic positioning system installs RFID electronic tags on all ladles to realize full-time and full-space ladle positioning and tracking. LDT-S200 ladle optimization control and analysis software, based on SQL Server database, B/S network structure, realizes online management of ladles, and adopts BP neural network system to realize intelligent optimization control of ladles. LDT-N200 ladle integrated management system can realize ladle age management based on ladle lining data and neural network algorithm, safety process control of ladle turnover and use, full-time tracking management of steelmaking production and full-space tracking management of ladle use and provide optimal control and management of steelmaking production and ladle maintenance. Comprehensive ladle measurement and monitoring, ladle positioning and management, and data management and optimization enable the LDT-N200 ladle integrated management system to fully realize ladle entire process management, optimize the service life of ladles, and comprehensively reduce the cost of refractory materials. The features: Using a lining thickness gauge to measure the thickness of the ladle lining Using infrared thermal imaging camera/embedded armor wire to realize ladle leakage detection Using RFID/number plate recognition to realize the location management of ladles Ladle age management system based on overall tracking Overall (full-time full-space) ladle management system based on database Provide overall production scheduling data Using neural network to predict ladle service life based on big data Ladle Optimal Scheduling System based on database and ladle service life Increase the service life of ladle by 12%-20% Reduce the use of refractory materials more than 15% Realize orderly management of ladle baking Realize full space and full time domain control Reduce the costs of ladle management and maintenance Improve the efficiency of ladle turnover operation

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Overview The system aims at the continuous temperature detection of the product obtained from the continuous casting machine. The billets and their surrounding environmental factors such as scale, steam, shielding and other factors, are considered in the scheme design and equipment selection. The accurate detection and real-time transmission of temperature during the billets movement are also considered. The equipment selection Temperature detection The billet temperature detection adopts the two-color integrated high- temperature thermometer produced by Wuhan CenterRise M&C Engineering CO.,； Temperature measurement range: 600°C - 1400°C; All components are installed in a sturdy housing for continuous measurement. The optimized treatment is taken for the problems that the semi-finished billets are hindered by steam or other particles (scale) in the environment, and the billets movement and the installation limited field of view. It provides fast, real-time monitoring of high temperature billets. Equipment cooling Using vortex air cooling device, no power supply is needed, only dry air is required, and the low temperature cooling gas below 0°C is output to cool the three sets of temperature detection equipment. Signal transmission The bidirectional RS-485 communication of the measurement and control system is used among multiple (multi-stream) measuring equipment or among the measuring equipment and the secondary meter. The Industrial Ethernet or DP network communication is used between the secondary instrument and the PLC. The signal transmission equipment adopts the communication equipment supporting multi-protocol network. Purge device (optional) When the environmental occlusion is severe, and the main occlusion is gaseous substances such as steam, it is recommended to use a purging device. The purging device uses dry air, and the solenoid valve controls the start and stop. Software Adopting DataTemp software to remotely set and monitor the measuring equipment. Adopting ScanTemp software to analyze and process the temperature data and eliminate invalid signals. Through the software model, the interference factors such as steam and iron scale can be overcome and the actual temperature of the casting billets can be displayed in real time. The features Using Si/Si stack detector, high sensitivity It is easy to use and has sturdy housing, which meets NEMA-4 standard Bidirectional RS-485/DP communication (can be networked), supports up to 32 detection sensors at most With user-defined alarm methods, analog and digital outputs are synchronized Use protective devices and air cooling devices, can withstand high temperature environment Accurate measurement of moving targets or targets obscured by dust, smoke and other particles in the atmosphere Adopt passive cooling apparatus, high cooling efficiency and low maintenance Use software to remotely set and monitor, analyze and secondary process the data, and optimize occlusion measurement The parameters Measurement range：600℃～1400℃ Response time：10msc) Spectral response：bicolor Accuracy：±0.75% Repeatability：±0.3% Cooling air pressure：>0.5Kpa Cooling air flow：24L/min Max.temperature：165℃ , Output signal：485 / DP / 4-20mA Environment standard：NEMA4（IEC529，IP65）

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Overview： This product is a new type of mold copper plate surface cladding detection equipment. The equipment adopts a high-precision and high-sensitivity laser ranging sensor, which scans the copper plate of the mould by scanning a laser line with a fixed width, and returns the measurement data in real time. After modeling and analyzing the data, the upper computer gives the wear data of the mold copper plate, as well as the data of surface cracks and surface roughness. The host computer software intuitively reflects the surface profile of the detected mold and cladding thickness deviation and other data to the user in the form of data sheet, data curves and mold 3D model diagrams, providing a true and reliable theory for on-site operators to maintain the mold. The mold surface cladding detection equipment is a high-precision instrument, which includes high-precision laser ranging sensors, two digital servomotors, encoders, horizontal sliding screws, vertical sliding screws, and calibration consoles, controllers and other components. The equipment has many advantages such as high accuracy, strong stability, convenient installation and strong observability. It is suitable for mold surface cladding detection, surface flatness analysis, surface flaw detection, taper measurement, etc. It is also suitable for round billets, square billets, slabs, special-shaped billets, etc., widely used and powerful. The composition of the system： 1. The mold surface cladding detection equipment is equipped with: data processing and display unit, horizontal motion mechanical power output unit, vertical mechanical power output unit, instrument motion control unit, laser measurement sensor, and instrument bracket. 2. Data processing and display unit: used for data acquisition and storage, system equipment control, parameter configuration, height display of the descent, start and stop control, etc. 3. Horizontal motion mechanical power output unit: the digital servo motor in the horizontal direction controls the sensor to move in the horizontal direction, so that the sensor can scan the horizontal inner cavity wall of the mold copper plate to detect data. 4. Vertical mechanical power output unit: the digital servo motor in the vertical direction controls the sensor to move in the vertical direction, so that the sensor can scan the vertical cavity wall of the mold copper plate to detect data. 5. Instrument motion control unit: It is used to control the motion scanning of the motor, and the running speed, running track, and control mode of the motor can be configured through parameter settings. 6. Laser measurement sensor: The laser displacement sensor adopts the principle of laser triangulation. The laser transmitter shoots the visible infrared laser to the surface of the measured object through the lens, and the laser reflected by the object passes through the receiver lens and is received by the internal line array image processing sensor. According to different distances, the corresponding positions of the light spots received on the line array sensor are also different. According to the angle of this reflection, the distance between the actual objects can be calculated by calculating the distance of the sensor spot. 7. Instrument bracket: The mold surface cladding detection equipment need to be placed directly above the mold when it is in use, and it is required to be fixed firmly without displacement vibration during the measurement process to ensure the measurement accuracy. The parameters： Detection instrument service life: ≥5 years; Detection instrument reliability: more than 98%; Detection range: 60~1000mm (customizable) Detection accuracy: 0.01mm Spot diameter: 1.0x1.5mm (spot scan), 1.0x20mm (line scan) Falling pace: 1~20mm/step Single measurement time: less than 2min Power supply: DC24V Operating temperature: -20~80℃ Equipment warm-up time: 3~5min Shock resistance: 50G (X, Y, Z axis) Vibration resistance: 10Hz~5Hz (amplitude 1.5mm, each 2 hours in X, Y, Z axis)

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Overview: Laser taper measuring instrument (multi-dimensional detection) is a new type of mold multi-taper measuring instrument developed by our company. The instrument adopts a high-precision, high-sensitivity laser measurement and positioning sensor, which scans the copper plate of the mold by a fixed- width laser line, and returns the measurement data in real time. The host computer shows the data of mold taper, surface cracks, surface flatness and other data after modeling and analyzing the returned measurement data. The upper computer software intuitively reflects the situation of the multi- taper surface of the tested mold to the user in the form of data table, data curve and 3D model diagram of the mold taper, and provides a true and reliable theoretical basis for the on-site operators to maintain the mold. The measurement principle: The mold multi-taper measuring instrument is a high-precision instrument. The whole instrument includes a high-precision laser ranging sensor, two digital servo motors, an encoder, a horizontal sliding screw, a vertical sliding screw, and a calibration console and controller etc. The equipment has many advantages such as high measurement accuracy, strong stability, easy installation and strong observability. The instrument is suitable for the multi-taper detection, surface flatness analysis and surface flaw detection of continuous casting molds in the continuous casting process of major iron and steel enterprises. It is suitable for round billets, square billets, slabs, etc., widely used and powerful. When measuring the multi- taper characteristics of the mold, the instrument is fixed on the top of the mold as shown in Figure 1. After the equipment is started, the self- inspection process is automatically completed, and the laser measuring sensor automatically returns to the initial zero position, and then the laser sensor scans along the inner surface of the mold under the drive of the digital servo motor, and then the laser sensor descends to a certain height to continue scanning for a circle. The entire inner surface of mold is repeatedly scanned from top to bottom. After the scanning is completed, the data is transmitted to the host computer through wireless communication or wired communication. The host computer software imports the collected data into the model base, and obtains the multi-taper status, surface flatness, cracks and other situation of the mold through calculation and analysis, which provide reliable maintenance reference data for on-site production and avoid production accidents on site due to the equipment failure. The features: Humanized human-computer interaction interface Convenient system settings Portable low power consumption design Compatible detection structure with lots of specifications High-speed and stable wireless data transmission High-precision laser scanning measurement One-click measurement design Own network wireless transmission Small and lightweight front-end measurement The parameters: Mold width range: 60~400mm Measurement accuracy: 0.01mm Spot diameter: 1.0x1.5mm (spot scan), 1.0x20mm (line scan) Measurement method: laser displacement measurement Measuring beam: 3200 points Movement mode: high precision servo Movement accuracy: 1mm/65536 pulses Single measurement time: less than 2min Power supply: DC12V Operating temperature: -20~80℃ Shock resistance: 50G (X, Y, Z axis)

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Overview: LGK-S107 analog heat source instrument (heating tool) is independently developed and designed by Wuhan CenterRise M&C CO.,. This instrument is a heating and testing equipment used to test the performance of the couple installed in the mold in continuous casting machine. After the installation of the mold breakout forecast couple is completed, the analog heat source instrument is used to test these couples before they go online. After the thermocouple is connected to the mold thermocouple detector, the current temperature of each thermocouple point will be displayed. By using our heating device to heat the copper plate point of each thermocouple at a fixed point, the thermocouple will have a synchronous temperature rise and then we can observe the temperature rise curve of the same column of temperature points to see whether the temperature measurement consistency of the column of couples is consistent, so as to judge the overall status of couples installed in the mold. If an abnormal point occurs, it needs to be repaired and replaced, so as to ensure the stable operation of the mold breakout prediction system. The working principle: The heating tool generates high heat by 220v alternating current and the electric heating element. The heat is transmitted to the copper plate of the mold through the copper head to simulate the heat source of molten steel, so that the thermocouples of the mold can sense the temperature change to achieve the purpose of calibrating the temperature measurement system. The composition: Walking trolley mechanism Preloader Pure copper heating contacts PID thermostat High power heating tube high power driver The parameters: Power supply: AC220V 50Hz Total power: 2200W Single point power: 300W Temperature control accuracy: 1°C Temperature control range: 0°C-500°C Common temperature range: 25°C-300°C Heating points: 3 (points can be customized) Heating method: heating tube heating Heating contact material: copper

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LAG-S400 Infrared Converter Slag Detection System Overview The infrared converter slag detection system uses a far-infrared thermal imager to monitor the situation of converter tapping in real time, and is connected to the main control computer in the electrical room through the conversion and transmission of video signals. The radiation intensity in the infrared wavelength range of 7-14um is different to distinguish molten steel and slag. In the later stage of the converter tapping, the molten steel gradually decreases, and the steelmaking slag is involved in the molten steel and flows out of the tapping hole. After the thermal imager recognizes the steelmaking slag in the imaging temperature measurement, it will give an alarm according to the slag content ratio threshold set by the software. The thermal imager will start the slide plate to close the tapping hole, so as to realize the control of the slag in the converter tapping, and ensure the maximum yield of molten steel and the minimum control of the steelmaking slag content. The effect of slag detection in converter tapping is of great significance to the control effect of the slag amount. The converter slag detection and control system developed by our company conducts non-contact monitoring of the tapping steel flow through the far-infrared detector thermal imager. It can detect the slag condition in real time and output an alarm signal and control system, which can replace manual visual inspection and provide accurate, efficient and stable slag detection effect. When the system finds the slag, the intelligent control unit quickly makes a judgment of lifting the furnace and blocking the slag and outputs an alarm signal. As shown in Figure 1, the system includes thermal imager, front purge protection box, front electrical box, power distribution cabinet, main control monitor, monitor of rocking furnace chamber, sound and light alarm, infrared converter slag monitoring software system, etc. The features of thermal imager 1. The temperature measurement range is -20°C - 2000°C, high temperature measurement accuracy, and multiple temperature measurement intervals can be set. 2. High-resolution thermal imaging system, the imaging picture is clear, and the imaging color can be freely marked according to the set temperature. 3. With hot zone alarm function, the alarm zone and temperature range can be set arbitrarily. 4. With hot zone tracking function 5. Equipped with special 7~14um infrared filter lens The technical parameters 1. Temperature measurement range: 200-1800℃ 2. Temperature measurement accuracy: 2% 3. Detection accuracy and alarm accuracy: ≥98% 4. Resolution: ≥ 0.5℃ 5. Pixels: 640x240 6. Band: 7~14um 7. Field of view: 7.5°×5.5° 8. Frame rate: ≥ 25 frames/sec 9. Equipment service life: ≥5 years 10. The normal operation rate of the automatic control system: ≥99%

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LDC-X200 Laser Diameter Measurement System Overview The non-contact diameter measuring system, is mainly used in the measurement of the outer diameter of various wire rods, bars, wires and pipes. The system can detect the change of the diameter (outer diameter) of the measured object in real time under the high temperature state. The working principle The diameter measuring system takes the laser scanning method as an example. It adopts the probe imported from Japan, which can achieve an accuracy of plus or minus 2 microns in the range of 0.3 to 30 mm. The acquisition frequency reaches 2000 times/second. The probe uses a self-excited infrared light source, which overcomes the measurement problem in dim environments. It adopts the measurement method of pulse parallel light scanning, and has a strong ability to resist the jitter of the measured object. (As shown in Figure 1) Since the shaking frequency of the measured object is much smaller than the scanning frequency, when the measured object A moves in the shakeable area, the measurement result will be able to ensure its accuracy because the time it blocks the beam does not change. Figure 1: Probe Scanning Radiation Area The detection principle is as follows Figure 2: Working Principle First, the crystal oscillator generates self-excited high-frequency pulses, which are sent to the comparator and the stepping servo motor respectively. The stepping servo motor drives the octahedral prism to rotate at a high speed, and reflects the infrared laser emitted by the laser generator to the convex lens A. It becomes parallel light, and then collects on the photosensitive element C through the convex lens B in the infrared receiving probe. The photosensitive element C converts this signal into a corresponding electrical signal and sends it to the other end of the comparator to compare with the original signal. When there is no object to be measured in the measuring probe, the pulse signal at both ends of the comparator will be the same. Therefore, there is no difference output: when there is an object to be measured in the measuring probe, the photosensitive element C will output no pulse signal during the period of scanning through the object to be measured. Therefore, there will be a difference input for a period of time at both ends of the comparator, which corresponds to the diameter of the measured object. By calculating the oscillation period of the pulse and the length of the time slice without pulse, the diameter of the measured object can be known. The composition and functions of the system The system consists of the following main parts (as shown in Figure 1) 1. A measurement frame with four pairs of high-frequency laser scanning probes and non-contact infrared thermometers is installed 2. Four intelligent signal processors connected with four pairs of high frequency laser scanning probes 3. Cold air blowing system for cooling and cleaning the measuring frame 4. High-performance intelligent controller responsible for front-end data signal processing and network communication 5. Data processing and analysis system installed with industrial grade PC, monitor and printer

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WGS-L020 Flat Steel/Ribbon Iron Width Measuring System Overview Whether the width and thickness of the flat steel/ribbon iron width measurement device can meet the standard in the production process directly determines the quality of the flat steel/ribbon iron. How to carry out high- precision measurement of flat steel produced at high speed is the key technology to improve the production efficiency and quality of flat steel. The flat steel/ribbon iron high-speed width measuring system developed by our company can monitor the whole process of flat steel production in real time. It can be used for the on-line analysis, processing, display and function alarm for the detected parameters of the width and thickness. We can provide customers with professional solutions. The measuring principle of the system The device adopts industrial laser sensor, through the principle of laser triangulation reflection: the laser beam is amplified to form a laser line and projected onto the surface of the object to be measured, the reflected light passes through the high-quality optical system to be projected onto the imaging matrix. Then the distance (Z axis) from the sensor to the measured surface and position information (X axis) along the laser line can be got after calculating. By moving the measured object or sensor, a set of three-dimensional measured value can be obtained. When measuring, we need to install a laser measurement sensor device directly above and below the ribbon iron. When the ribbon iron passes through, the width distance from the left and right of the ribbon iron and the height distance from the sensor to the ribbon iron can be measured by laser scanning. The thickness of flat steel can be measured by two sensors up and down. The flat steel width measuring system is mainly composed of line laser measurement sensors, connectors, front-end data acquisition, operation station (workstation) and server, mechanical structure, cooling protection device, etc. These devices form an independent measurement and calculation network, and through the high-speed data measurement and calculation of the system to achieve the alarm control of the detection record. The features of the system It can effectively identify and compensate the beating, inclination, side deviation and profile of the flat steel/ribbon iron to be tested; Moving image linear noise correction technology, 3D modeling technology; The software has self-diagnosis function; Full digital detection, automatic calibration system; Unique optical vibration compensation technology; High measurement accuracy and fast response; Using optical fiber signal transmission; Quality control alarm; Excellent mathematical model realizes accurate width detection of the bad profile; The software interface is good, powerful, easy to operate and maintenance- free; The technical parameters Measuring distance: less than 300m (according to the on-site environment) Resolution: ±0.05mm Repeatability: 0.1mm Measurement frequency: 80KHz Measurement output frequency: 50Hz (adjustable) Laser class: 2 (IEC60825-1:2014) Protection class: IP65 Communication: TCP/IP communication Measurement range of temperature: 0℃-2000℃ Working temperature: -20℃-60℃

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MLC-V235 Continuous Casting Mold Level Automatic Measurement System Overview The automatic control for the molten steel level of the mold is one of the key technologies of continuous casting production. It is very important to reduce the labor intensity of workers, improve production efficiency, improve the quality and output of casting billet, reduce overflow and breakout of steel and improve the management level of steelmaking and continuous casting. The molten steel is poured into the mold. In order to prevent overflow, the molten steel level must be kept stable. Otherwise, during the casting process, if the level will fluctuate too much, and slag will be involved, forming surface slag inclusion on the surface of the casting billet, affecting the quality of the billet. The test points out that the relationship between the level fluctuation and the depth of casting billet surface slag inclusion is as follows: The experience has shown that surface slag inclusions can be eliminated when the level fluctuation is within ±10mm. At the same time, if the level fluctuation is more than 10mm, the rate of longitudinal cracks on the casting billet surface is 30%. It means that the level fluctuation directly affects the surface quality of the casting billet. The principle of the system The eddy current type molten steel level gauge is the key to the system. The system operates reliably and has excellent performance: high temperature resistance, strong anti-interference ability, fast dynamic response (lag time <0.10s), high detection accuracy (<±05mm), and large measurement range (0-150mm). The selected electromagnetic field frequency ensures that the level detection probe only detects the level change of the mold and does not detect the mold flux or steel slag layer. The system has the advantages of simple operation and no radiation protection problems. The system is insensitive to argon blowing, and its sensors can be mounted on the tundish car or on the platform. The sensor is cooled by compressed air during use. The principle is shown in the figure A high-frequency exciting winding is installed above the molten steel surface of the mold. The magnetic field produced by exciting winding make induced eddy current appear. The magnetic field generated by the induced eddy current is in the opposite direction to the magnetic field generated by the high-frequency exciting winding, which changes the impedance of the high-frequency exciting winding. Under the condition that the winding material and structure, steel grade, temperature remain unchanged, the coil impedance change only has a single-value function relationship with the height of the molten steel level. As long as the impedance change of the high-frequency winding is detected, the change of the molten steel level in the mold can be converted. The components of the system Continuous casting mold level automatic control system is composed of eddy current tyoe molten steel level gauge, controller and digital actuator for adjusting the opening of tundish stopper. The detection end of the mold level automatic control system is ① eddy current displacement sensor, which uses the eddy current mutual inductance effect between the energized coil and the metal conductor to detect the distance. The effective signal of the eddy current sensor is amplified and linearized by the circuit of ② mold level gauge, which converts the 0-150mm change in the molten steel level of the mold into a standard signal of 4- 20mA.DC, and then transmits it to the ③ control computer to complete data processing and system control functions. We can also control the actuator manually and automatically through the ④on-site operation display control panel, and the opening of the stopper is controlled by the ⑤ actuator to realize the automatic control of the molten steel level. 1 Eddy current sensor; 2 mold level gauge; 3 control computer; 4 On-site operation display control panel; 5 digital actuator; The control principle of the system The system can be set to four control modes: automatic, semi-automatic, manual and motor clutch. The automatic mode is the closed-loop control system of the molten steel level, and control the opening of the stopper by the digital actuator; the semi-automatic mode uses opening degree setter and digital actuator to set the opening of the stopper manually; the manual mode is to open and close the button directly to control the opening of the stopper; the motor clutch mode is quickly changed from any of the above control methods to manual stopper operation. The functions of the system also include: display and record of molten steel level, nozzle opening and casting speed; setting of molten steel level and nozzle opening; alarm of molten steel level at limit value etc. In addition to taking the detection of molten steel level as the main feedback signal of the control system, the control system also considers various interference factors that have an impact on the level control. These interference factors include: 1. The influence of the change of the flow characteristics on the control system after the melt loss of the stopper 2. The influence of the weight change of molten steel in the tundish on the control system 3. The influence of the change of the casting speed of the continuous casting machine on the control system 4. The influence of the mold width change (the mold width is adjustable) on the control system 5. The influence of the vibration frequency and amplitude of the mold on the molten steel level gauge The function and software implementation In order to overcome these disturbances, the mold level control strategy adopts PID control. And on the basis of PID control, self-adaptive correction and feedforward control are introduced to form an advanced control system. The level control is the main loop, and there is a proportional gain of the main loop controller. According to the self- adaptive correction of the mold width change and feedforward compensation of casting speed, so as to further reduce and eliminate liquid level fluctuations caused by mold width adjustment and casting speed changes. In order to reduce the frequent action of the stopper, the system adopts the intergarting time change of the controller, and automatically selects a longer intergarting time when the molten steel level fluctuates lightly. And the system will choose a shorter intergrating time when molten steel level fluctuates greatly. Thereby, the fluctuation of the controlled object caused by the frequent action of the stopper rod is suppressed. In the signal processing of molten steel level gauge, an appropriate filtering link is added and the vibration frequency synchronous filter is used for filtering processing, which can overcome the interference of mold vibration frequency and amplitude variation.

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ZSQ-T100 Online Surface Quality Inspection System for Casting Billet (Eddy Current) The principle of the system The ZSQ-T100 online surface quality inspection system for casting billet adopts the principle of eddy current non-destructive testing. According to the section of the continuous casting machine and the shape of the casting billet, the eddy current sensors of different structures can be used to realize the non-contact surface defect detection on the surface of the billet, and draws the surface defect graph of the billet in real time according to the detection results. The composition of the system Detection frame: The detection frame is used to support the central detection sensor. The height of the detection frame can be adjusted automatically by the motor, so that the central detection sensor is aligned with the casting billet to be inspected. Front and rear vertical nip roll device: The front and rear vertical nip rolls are used to make the inspected billet pass through the central detection head at an even and stable speed. The pressure roller is double pushed by the cylinder and the spring. Central testing host: The central testing host is placed on the testing table. It has a four-sided control disc that scans the surface of each casting billet. Descaling device: It is used to remove the oxide scale on the surface of the casting billet and eliminate the influence of noise on the eddy current flaw detection. System console: used to control the equipment and the entire testing process, control the mechanical actions of each unit and adjust the instrument parameters. It can realize automatic flaw detection online detection. Sensors: Slabs generally use eddy current sensor arrays to test the surface quality of the casting billet. Square billets, round billets and shaped billets generally use through-type eddy current probes to test the surface quality of the casting billets. The main technical index of the eddy current testing on the surface of continuous casting billets 1. The objects of flaw detection: slabs, round billets, square billets and shaped billets of various sizes. 2. The steel grade of the casting billet: ordinary low-carbon steel or alloy steel. 3. Detection temperature: 400~1000℃. 4. Detection speed: ≤3~40m/min. 5. Allowable speed fluctuation range: 0~40m/min. 6. Detection of defect types and sizes: scratches with a depth or height greater than 1.5mm, wrinkled skin lines, cold splashes, bumps, pits and longitudinal facial cracks, transverse cracks, mesh cracks, and subsurface inclusions with a depth greater than 3mm. 7. Blind spot for flaw detection at the end of the casting billet: 25mm. 8. Detection frame area: ≤3m (transmission line direction)

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