| China is a large agricultural country, China has become the largest corn crop. Corn sowing seed in the accuracy of the process directly affects corn production efficiency. In this paper, the current corn planter occur during working companion and artificial drain replant problem of inaccurate, combined with China’s corn planting agronomic requirements, using the real-time detection replant manner seeding operations, thereby reducing the labor intensity, improve productivity and quality of sowing. In this paper, domestic common corn Precision Metering device——scoop-type metering device designed replant shift speed system, which has a simple structure, low cost and seeding replant one of the characteristics more suitable for China’s national conditions.This article is developed replant shift speed system of scoop-type metering device departing from the kinds of ports 20 ° position early detection, carried out over the speed to reach the empty slot replant seed purpose leak discovered when broadcast. The system is designed to reduce the leakage rate and improve the quality of sowing. The main research is as follows:1, The study of the physical characteristics of grain corn. Jiulong No. 5, Jiudan 57 and Zhengdan 985 varieties of three kinds of three-dimensional geometry of maize grain, thousand-grain weight, density, moisture and static coefficient of friction was measured and th e average geometry of Three Maize grain varieties were classified as spherical conical and rectangular, to provide the basis for subsequent EDEM simulation parameters.2, Theory and simulation analysis of shift speed of scoop-type metering device. Based scoop-type metering device works on the dynamics of grain- filling stage and detect mouth scoop-type metering device shifting speed state analysis, the compensation limit acceleration. Simulation of maize deed quality of five speeds three cultivars EDEM, an d affect the simulation before and after the shift speed, the shift speed of comparative seeding quality depending on the speed, it lays the foundation of design theory of replant shift speed system of scoop-type metering device.3, Design of replant shift speed system of scoop-type metering device. Determine the overall replant shift speed system program and its design include: determining and system hardware and software design selection, detection hole design, sensor mounting position of the sensor.4, Commissioning and experimental research of replant shift speed system. In order to ensure replant shift speed system reliability, replant shift speed system commissioning and sensor accuracy test; in JPS-12 Seedmeter performance testing rig scoop-type metering device performance test replant shift speed system and with the original scoop-type metering performance test data for comparison.Studies have shown that: When replant shift speed system of scoop-type metering device operating speed is 13.9 ~ 23.1 r / min, the leak rate does not exceed 1.4% sowing, replanting average rate of 89.95%, seeding rate of 98.6%. When operating speed 27.7r / min, compared to the original leak spoon Seeder sowing index decreased 10.4%, the most obvious effect replant. When working speed reaches 32.3r / min, the shift system due to replant seed shake off the serious replant almost no effect. In the three types of corn, Jiulong No. 5 drain broadcast lowest index, Zhengdan 985 followed, Jiudan 57 highest. |
