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AbstractAn electric control and data acquisition system of longitudinal axial flow cleaning device test-bed was designed based on the technology of computer aided testing. The system can collect real-time data, adjust the parameters timely, operate simply, provide reliable data for experimental study of cleaning device. The experiments show that the accuracy of cleaning experiment data is improved by the system, which has significant guide to experimental study, design and manufactory of cleaning device. Key words: longitudinal axial flow, air-and-screen cleaning device, electric control,acquisition system I. INTRODUCTIONhe air-and-screen cleaning device is an important part of the combine-harvester, which affects the machine work performance directly. Therefore, it is significant to study the performance of cleaning device. But due to the field conditions are diverse, field experiments are strong seasonally and poor repeatability, some experiments cannot proceed in the field, therefore, it is necessary to develop cleaning test-bed, which is used to simulate and reproduce the whole process of cleaning, obtain the performance and working parameters of the key components.Traditional test methods adopt experimental equipment of simulating instrument and simulated record device, the measurement precision and test efficiency are very low, which cannot meet the requirements of cleaning test cycle is long, lots of parameters, a large quantity of data and real-time acquisition 1-3. The computer test technology and electronic control technology are introduced into the experiments to achieve automation of cleaning test data collection and test process, provide scientific research methods to cleaning device performance study of harvest machinery,in order to get better cleaning testing results. II.THE INTEGRATE STRUCTURE OF CLEANING DEVICE TEST-BED The cleaning device test-bed is made up of feeding analogue devices, framework, centrifugal fan and adjusting mechanism, cross flow blower and adjusting mechanism, This work was supported by Science and Technology Plan Projects of Heilongjiang Province Agricultural Reclamation Bureau (HNKXIVZD - 024) Yifeng Zhang is with college of engineering, Heilongjiang Bayi Agricultural University, Daqing, 163319, China. Mobile: 13836961961 E-mail: zhang_. vibrating screen frame, screener, shuttle board, drive gear, take-up pan, wind speed sensor, integrated console, data acquisition systems,torque sensor, motor, etc. The structure parameters and operating parameters can be adjustable,can meet the test requirements of axial flow cleaning device by adjusting the sieve crank radius, crank rotational speed, centrifugal fan rake angle, fan rotational speed, fan position, vibrating screen obliquity, shuttle board length and replacement of different types of sieving slice, etc.The structure of test-bed is shown in figure 1. III.DESIGN OF THE ELECTRICAL CONTROL AND DATA ACQUISITION SYSTEMThe electric control and data acquisition system of test-bed was designed, which can collect real-time data of environment temperature, environment humidity, fan rotational speed, fan torque, fan power, feed speed, rotational speed of vibrating screen shaft, torque of vibrating screen shaft and the screen surface wind speed etc., through the operation cabinet, the system can control real-time size and switch of vibrating screens vibration frequency, fan rotational speed, feeding speed etc. The control principle and main circuit diagram are shown in figure 2, 3. A. Hardware System Measurement and control hardware system of the cleaning device test-bed include torque sensor, rotational speed sensor, wind speed sensor, environmental temperature sensor, humidity sensor, the data acquisition card, inverter, frequency control motor, integrated console, PLC and industrial control computer, printer,etc.,its composition as shown in figure 4. Parameters of the cleaning device experiment should be measured are as followed: feeding roller speed, centrifugal fan speed and torque, centrifugal fan outlet angle, cross flow blower speed and torque, the crank rotational speed and torque, eccentricity, vibrating screen obliquity, vibrating screen amplitude,etc., the parameters of eccentricity, centrifugal fan export obliquity and vibrating screen obliquity can be measured by human, the rest parameters can be input computer through the sensor directly. The Design of Electric Control and Data Acquisition System for Cleaning Device Yifeng Zhang and Shujuan Yi (College of Engineering, Heilongjiang Bayi Agricultural University, Daqing163319, China) T1828978-1-4244-8736-3/11/$26.00 c ?2011 IEEE?Illustrate :1?electrical cabinet 2?Thread storage box 3?centrifugal fan rack4?centrifugal fan electrical machine 5?centrifugal fan 6?adjustable speed motor 7?shuttle board 8?crank connecting link driving mechanism9?feeding analogue devices 10?upper vibrating screen 11?under vibrating screen12?discharge grain roll 13?main frame 14?take-up pan 15?cross flow blower 16?cross flow blower electrical machine 17?cross flow blower frame Fig. 1. General assembly drawing of cleaning device test-bed ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?Fig. 2. Control schematic diagram of cleaning device test-bed 2011 Chinese Control and Decision Conference (CCDC)1829? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?Fig. 3. Main circuit drawing of cleaning device test-bed Fig. 4. Data acquisition and control system of the test-bed for cleaning device Both rotational speed and torque are measured by Beijing West Catic Mechanical and Electrical Technology Limited Companys CYB -803S type torque sensor, as shown in figure 5. Real-time data of torque and speed are collected through computer software, which provides favorable conditions to the power consumptions research, experimental conditions settings and regulation. Fig. 5. Torque and rotational speed sensor Fig. 6. Airflow sensors Airflow velocity sensor are Shanghai NaHua Technology Co.s Productions, as shown in figure 6. Supporting frame torque sensor, rotational speed sensor wind speed sensor signal disposal PLC inverter signal the data acquisition card Industtorque sensor, rotational speed sensor printer A/D temperature sensor emperature humidity sensor displayer control box knob control box meter speed regulation electromotor 18302011 Chinese Control and Decision Conference (CCDC)and a sieve become an organic whole, the distance from airflow velocity sensor to the screen surface can be adjustable (0100mm), the airflow velocity can be measured in above and below of sieving. 20 measuring points are designed in whole sieving altogether, namely to wind speed sensors number is 20, which can finish multi-point measurement of airflow velocity one time, data can directly collcet through acquisition system, air flow field can be studied on cleaning indoor. PLC selects S7-200 series of Siemens, through a serial port connects to industrial PC, torque and speed sensor output pulse signal after signal regulate circuit into programmable controller (PLC), and real-time measures for torque and speed, will be measured all data to the industrial computer for storage, real-time display and processing, remote monitoring of the industrial computer for the working process of the test platform is realized. B. Software Systems 1) PLC Data Acquisition Parts Torque and speed sensor outputs pulse signal,through conditioning, after entering PLC,using PLC built-in high-speed counter (HSC) to carry on the count. The S7-200 PLC of Siemens has 6 high-speed counter (HSC). Among them HSC3 for rotational speed pulse count, HSC5 for torque pulse count, need to operate its control bits, the current values, set values and status bits in applications. The sampling time are provided by PLC timing interrupt.The time interval T0 of timer interrupt is 1255 ms, PLC scanning cycle is about 5 10ms according to application size, so the sampling time should not be less than 10ms, at the same time, in the lowest rotational speed, in every sampling time should be not less than 10 pulse, to ensure the accuracy of measurement. Timing time size affect measuring precision and real-time, accuracy is higher in timing longer, but real time is poorer. Take the sampling time T0 for 100 ms in this system, in order to ensure the measuring precision, counting takes the sum within 3 times sampling time, namely calculate within 0.3s the count value. Speed measurement is calculated 60 pulse in weekly: 000603.33603KnKT= (1) Type: n:rotational speed?r/min; K0:three times rotational speed pulse total numerical value. Similarly,torque for: 100010030.331000ppKfffTMNNKffff= (2) Type: M:torque?Nm; F:the current output frequency; N:torque measuring range?500 Nm; K1: total numerical value of three times torque pulse; f0: zero output frequency of torque; fp: output frequency of forward direction full range. 2) PLC Communication Parts Aftert PLC converts pulse signals to the corresponding rotational speed and torque values, store it in fixed region of a variable storage area, serial of PLC has been in receiving state, after receive read command of the industrial PC, convert to sending status, data of the variable storage area is sent to industrial PC through a serial port. Considering the transceiver switching have certain time interval, so the system with timing interrupt 1 to produce 5 ms delay time to send again. PLC communication service processes as shown in figure 7. ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?Fig. 7. Flow diagram of communication with the PLC 3) Monitor Parts of Industrial PC The main functions of the software:this software based on PLC serial communication way, can undertake data acquisition, display, storage and load for rotational speed and torque of vibrating screen, speed and torque of centrifugal fan, speed and torque of cross flow blower, wind speed, the environment temperature and environment humidity. Data format stores for XML and XLS. Software operating condition The hardware requirements:CPU For Pentium III 800M above, memory is not less than 64M, the remaining space need 1G above.The operating system:the operating system need windows 2000 or windows xp. The software is green without loading and unloading, just copy to the disk or delete simply. Main interface of software:detection software uses visible programming language, main interface of detector software is shown in figure 8. 2011 Chinese Control and Decision Conference (CCDC)1831Fig. 8.Data acquisition and control system main interface of the test-bed for cleaning device ?. CONCLUSIONAn electric control and data acquisition system of cleaning device test-bed was designed with the view of collecting real-time data and timely adjusting the parameters through computer. Through the electric control and data acquisition can collect real-time data of environment temperature, environment humidity,