Authors

Abstract

Aiming at the problems that the cutter frequency of combine harvester is difficult to be adjusted adaptively with the forward speed, and that the missed cut or repeated cut may cause the harvesting loss to increase and the operation effect to fluctuate greatly, the system is designed to regulate the cutter frequency of combine harvester by sections. By constructing the cutter trajectory equation, the influence of the relationship between the forward speed of the harvester and the cutting frequency on the cutting area is analyzed, and the optimum cutting frequency range at different operating speeds is determined. The results show that the error between the actual cutting frequency and the desired frequency of the cutter is less than 0.8Hz, and the maximum relative error is less than 8.6%; the average steady-state adjustment time of the system is 1.3s when the input cutting frequency of the device changes abruptly. The research class provides technical support for the improvement of the combine harvester handling system and the increase of the machine automation level.

Abstract in Chinese

针对目前联合收获机割台切割器频率在收获过程中通常保持不变，容易产生秸秆的重割或漏割现象，造成谷物收割损失增大、作业性能不稳定等问题，设计了联合收获机割台切割器频率分段调控装置，该装置主要由信号采集及调理模块、按键模块、控制模块和显示模块等组成。对切割图进行理论分析，确定了不同动刀片刃部高度与机器作业速度条件下切割频率范围。调控装置根据实时监测的联合收获机作业速度和切割频率，运用调控算法实现切割器频率的分段调控。测试结果表明，装置调整切割频率偏差保持在 0.8Hz以内，最大相对误差为-8.6%。在装置输入切割频率阶跃信号情况下，系统平均稳定调节时间为1.3s；田间试验表明，使用该切割器频率分段调控装置后，未出现漏割穗现象，且短小茎秆数量明显减少，重复切割的情况得到改善。