Research Of The Torque Testing System In The Spiral Rotary Tillage And Stubble-Mulch Roller Based On Virtual Instrument

Rice is one of the main crops in southern China. Residual straws after machinary harvest bring big difficulty for paddy fields tillage. Boat rotary tillage and stubble-mulch machine is a new tillage equipment of mechanized protective cultivation, which is suitable to rice multi-cropping paddy fields. It can complete prostrate straw, rotary tillage, stubble-mulch, level off paddy field simultaneously, and could realize moderate tillage of paddy fields, return stubbles to fields with combined operation of mechanized. The spiral rotary tillage and stubble-mulch roller is the main working parts and the leading power consume parts of the boat machine. At present, only qualitative test and analogy method are used to analysis the power consumption of the new roller, the inaccurate dataes obtained cause great difficulties for study on roller's working mechanism and parameter optimization. Therefore, reasonable method is needed to measure the roller's power consumption.Soil mechanical resistance is an important mechanics property of soil. It has a great influence on corp growing and soil tillage. Soil mechanical resistance is shown as cutting torque for rotating tillage equipment. The traditional measurement is mainly use penetrometer to measure cone index, this method is low efficienty and heavy workload. And the result of the measurement is scattered point date, it can't accurately reflect the spatial distribution of soil mechanical resistance. Therefore, continuous measurement which can be realized by measuring the torque of the roller is required to measure soil mechanical resistance.A torque testing system based on LabVIEW was designed. The soil-bin experiment with the teting system was carried out to find the relationship between the roller's motion parameters and torque.The torque testing system is made up of JN338A torquel sensor, N1 PCI-6024E DAQ card and LabVIEW programs. With this system, the torque, speed and power can be tested automatically and continuously, and the results can be displayed and stored simultaneously. The testing system is in high efficiency and easy to operate. The calibration results show that the the testing is also in high precise. It can be used to test torque of the roller, providing data support for analysis of influencing factors of the roller's power consumption and exploring roller's working mechanism and analysis of soil resistance. The soil-bin experiment includes single factor experiment and linear regression orthogonal experiment of different roller's forward speed, rotating speed and ploughing depth. During the experiment, the roller's forward speed range is 0.1m/s-0.5m/s, rotating speed range is 260r/min-340r/min, ploughing depth range is 75mm-100mm. Single factor experiment results show that, the roller's torque has a exponentially relationship with the roller's forward speed, and it decreases when the rotating speed increases, but the trend is smaller, the roller's torque increases rapidly when the ploughing depth become deeper. Regression orthogonal experiment results show that the roller's forward speed and ploughing depth have significant effect on torque, as well as the rotating speed has no significant effect on torque.