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Experimental Research on Controlling System of Rape Variable Seeding

Author: GaoXiaoYan
Tutor: TangChuZhou；WuMingLiang
School: Hunan Agricultural University
Course: Agricultural Mechanization Engineering
Keywords: Variable Seeder Control Sowing detection Test
CLC: S223.2
Type: Master's thesis
Year: 2011
Downloads: 55
Quote: 2
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Abstract


Traditional agricultural production and widespread waste of resources, input-output rate of the phenomenon. Notably the indiscriminate application of large amounts of fertilizer and sow the seeds of overdose, resulting in soil and groundwater polluted and seed of excessive waste, affecting the overall quality of agricultural products and crop yields. Therefore, traditional agriculture to achieve precision agriculture transformation, change the variable inputs and quantitative investment management can save energy, improve environmental conditions in order to improve the level of agricultural production and crop quality. Sowing is variable depending on the amount of different types of land use to automatically adjust the amount of a broadcast sowing method. In this thesis, Hunan Agricultural University, developed eccentric hole wheeled type metering device for the study, by increasing the control system and auxiliary equipment to realize the amount of rapeseed sowing variable control. Mainly carried out in the following aspects of research. (A) test can be obtained by changing the eccentric wheel-shaped hole seed metering device shaft speed to achieve seed volume changes. Through the existing holes wheeled eccentric type metering device for metering the amount of seed shaft speed conducted bench research, got to meet the amount of seed and seed characteristics requirements of the premise, the speed range of 30 - 70r/min, its speed n and seeding a linear relationship between the amount of q: q = 0.2283n 0.6683. The results showed that: by changing the eccentric wheel-shaped hole seed metering device shaft speed to achieve seed volume changes. (2) to establish a seed shaft speed n, machinery planter forward speed v and Q ha sowing mathematical model between. Field not only with the sowing of the seed metering device volume and seed characteristics related, but also by the forward speed of the traction equipment. To this end, have been met by laboratory bench seed volume and seed characteristics of requirements under the premise of the equipment forward speed range is 0.8-2.6 km / h. As the basis for establishing a seed shaft speed n, machinery planter forward speed v and Q ha sowing mathematical model between Q = (0.2283n 0.6683) / 6v. (3) detection system was developed sowing and sowing rate control system. In a mathematical model, based on the use of servo motors as actuators, microcontroller as the core controller, use optical encoder disk on equipment acquisition forward speed, fiber-optic sensor detects the amount of sowing, while using LCD1602 LCD module and a × 4 keyboard form a man-machine interface operating system. Then the system objectives to be achieved in software development, and in sowing detection system by adding a fuzzy algorithm to improve detection accuracy. Eventually connected through the various components and procedures developed the eccentric downloaded shaped hole wheeled seeder planting canola variable control systems and sowing detection system. (4) Through trial on rape seeding system variables were verified. Conducted two experiments, one group is different by manual keyboard input sowing, the other group is a virtual one hectares sowing the curve with time as the field prescribing information, and broadcast through the serial port of the function table inputs to the microcontroller. in order to achieve automatic variable seeding. The results show that the studied variable seeding canola rapeseed variable seeding system has reached the requirements sowing detection error is less than 15%.

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CLC: > Agricultural Sciences > Agricultural Engineering > Agricultural machinery and implements > Planting machinery > Planter
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