Authors

Abstract

The core equipment of rice dry direct-seeding with film mulching devices shows poor adaptability to rice varieties, struggling to accommodate diverse seeding quantity for both hybrid and conventional rice varieties. A seed-filling component with unilateral and bilateral seed-filling function was designed to solve this challenge. Through theoretical analysis the key structural parameters of the seed-filling component were determined. Then Discrete Element Method (DEM) simulations were conducted to analyze the seeding performance, leading to the identification of optimal parameters for orifice width and orifice deflection angle of the seed-filling component, which are 7.7 to 8.5 mm and 1.71 to 2.41 degrees, respectively. Bench experiments using the central composite design indicates that the optimal parameters for the seed-filling component's orifice width and orifice deflection angle are 8.1 mm and 1.99 degrees, respectively. In the optimal combination of orifice parameters, for unilateral seed-filling in hybrid rice, the miss-seeding rate is 4%, the qualified rate is 84.8%, and the reseeding rate is 11.2%. For bilateral seed-filling in conventional rice, the miss-seeding rate is 4.2%, the qualified rate is 85.2%, and the reseeding rate is 10.6%. The result of field hole-seeding with film mulching is consistent with the result of indoor bench experiments, demonstrating that the seed-filling component of the hole seeder can meet the seeding requirements for rice precision direct-seeding with film mulching. This paper provides theoretical reference for the design and optimization of the seed-filling component for rice hole-seeding equipment.

Abstract in Chinese

针对水稻覆膜旱直播核心装备穴播器品种适应性差，难以兼用于穴播量迥异的杂交稻和常规稻覆膜播种的问题，设计了一种具有双侧充种功能的取种装置，理论分析确定了取种装置的关键结构参数，进行了排种性能的离散元EDEM仿真分析，明确了取种装置进种口宽度和型孔偏转角的取值范围，分别为7.7~8.5 mm和1.71～2.41°；中心组合试验设计方法的台架排种试验表明，最佳的取值装置进种口宽度和型孔偏转角分别为8.1 mm和1.99°，此时，单侧充种播种杂交稻，漏播率为4%、合格率为84.8%、重播率为11.2%，双侧充种播种常规稻，漏播率为4.2%、合格率为85.2%、重播率为10.6%，田间覆膜播种试验与室内台架排种试验结果一致，表明穴播器取种装置能满足水稻覆膜精量穴播的排种要求。本文为水稻穴播器取种装置的设计及优化提供理论参考依据。