Design And Experiment Research Of Continuous Measurement Device On Soil Mechanical Resistance

Precision Agriculture is an agricultural development model that put forward by foreign scholars firstly, whose goal is to achieve the "farming by the inch". Precision Agriculture is a new idea of sustainable development, is also a new trend of the development of agriculture in the world. Precision Agriculture can reduce the cost of crop farming, boost crop productivity and protect the environment, its basic idea is to fully understand the soil physical property to achieve a fine planting of crops and management. Designed a device based on the thought of Precision Agriculture for continuous measurement of soil mechanical resistance.The paper summarizes and analyzes the existing measuring methods of soil mechanical resistance, explains the significance, purpose and technical route is drawn. Pointed out the factors that affect soil mechanical resistance, including soil texture, structure of the soil itself, soil water content and measuring the depth, speed, etc. Combined with the actual situation, based on the existing force-measuring device, a deep-shovel is designed. Finite element analysis of deep-shovel is based on SolidWorks2013 Simulation and sets up a dimensional model of deep-shovel using SolidWorks2013 to ensure the safety of the production and testing of the prototype. Control system is based on the Arduino UNO that converts analog signals measured by force sensors, Ultrasonic sensors into electrical signals, also converts the electrical signals into physical measurement data by arithmetic statement. Measurement data are displayed on the LCD screen and stored in the SD card, the system realizes the function of continuous measurement, real-time measurement and large amounts of stored data. The system selects the "s"-type force sensor, its strong anti-interference, high sensitivity, safety and reliability. The system selects the Arduino UNO that can extend any number of controllers depending on your needs, combination with other sensors realize more features and higher integration. The device is simulated by Proteus and connects the hardware. Proteus simulation and actual test results is consistent, the result verifies the correctness of measurement procedures and the feasibility of the device.Made a prototype and finished the experiment. Before the soil bin testing, continuous measuring device is calibrated tests, processing experimental results and calibration equations are obtained. The calibration equation of correlation properties are evaluated, calibration of nonlinear equations is nonlinear better, high repeatability. After the calibration test, the soil bin experiments are carried out. The test results are mapped a soil mechanical resistance map. Compared the continuous measurement device and measurement of the soil compaction tester results, two kinds of measuring methods have the best correlation relationships, so the continuous measurement of soil mechanical resistance of deep-shovel can evaluate the level of soil compaction, can be used as a method for evaluation of soil mechanical resistance.