Abstract
Based on the magnetic seed-metering principle, a new magnetic plate-type precision seeder and seeding production line were developed to meet the requirements of precision seeding. The control system was designed based on Programmable Logic Controller (PLC) and Mico Controller Unit (MCU). Automatic programming techniques, sensor technology, acceleration and deceleration control of step motor were integrated into the system. The PLC control system controls the workflow of the production line to realize accurate positioning of the tray and its coordination. The MCU control system controls the flip of the sowing board, as well as the up-and-down movement of the seed case for whole tray seed-filling and sowing. Seeding tests for the magnetic powder coated rape seeds showed that the rates of single-seeding, over-seeding and miss-seeding were 90.2778%, 4.6875% and 5.0347% respectively. The seeding speed was up to 14s per tray. This result meets the requirements of precision seeding.
Highlights
Precision seeding requires accurate number of seeds, spacing and sowing depth
From the magnetic seed-metering principle, this paper developed a novel magnetic plate-type precision seeder and seeding production line aimed at ensuring the requirements of precision and high uniformity
As illustrated in Fig. (6), the workflow of the Mico Controller Unit (MCU) control system is as follows: the sowing board, driven by sowing step motor, flips up after switching on the power. When it flips to the seed-filling zero position, the board stops flipping and the seed case, driven by seed-filling step motor, moves up to the top of the sowing board, after which it moves down to the bottom to complete seed-filling; the seeder stops for a while to get a signal from the Programmable Logic Controller (PLC) control system
Summary
Precision seeding requires accurate number of seeds, spacing and sowing depth It has advantages of saving seeds, reducing thinning time and improving crop yields. Most factory breeding production lines are developed on the basis of the precision seeding technology Their workflow includes subsoil covering, holes punching, sowing, watering and topsoil covering etc. The seeder comprises LJD51-XB + MCU with one photoelectric sensor and four proximity sensors to control the acceleration and deceleration of two step motors This MCU system is meant to allow the movement of the seed case and the flip of the sowing board. The production line comprises DVP-40ES PLC with five photoelectric sensors and one proximity sensor to control the seven single-phase AC motors This PLC system is designed to achieve the tray conveying, subsoil covering, holes punching, watering and topsoil covering. The objective of this study was to design a control system for magnetic plate-type precision seeding production line
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