Kinematic Analysis of the Effective Reeling Interval of a Rapeseed Combine Harvester Reel at Different Reel Indices

Yiming Zhang

doi:10.6919/ICJE.202609_12(9).0003

Authors

Yiming Zhang School of Agricultural Engineering, Jiangsu University, Zhenjiang 212013, China

DOI:

https://doi.org/10.6919/ICJE.202609_12(9).0003

Keywords:

Rapeseed; Combine Harvester; Reel; Reel Index; Motion Trajectory; Effective Reeling Interval.

Abstract

To clarify the interaction between reel tines and the rapeseed canopy under different reel-index conditions, a conventional fixed-diameter reel was investigated. A kinematic model of the tine endpoint was established by coupling the forward motion of the combine harvester with the rotary motion of the reel, and the tine trajectories and horizontal motion characteristics at different reel indices were analyzed. The effective reeling interval was then defined by combining the spatial distribution of the rapeseed canopy with two criteria: the tine endpoint had to lie within the effective canopy-height range and possess a backward horizontal velocity component. Effective action angle, effective action time, and effective horizontal action range were used to characterize reeling performance. The results showed that the reel index markedly affected both the tine trajectory and the effective reeling interval. When the reel index exceeded 1, a backward-motion segment occurred in the tine trajectory. As the reel index increased, the effective action angle and horizontal action range changed systematically, whereas the effective action time was jointly governed by the action angle and reel angular velocity. The proposed method provides a theoretical basis for matching the operating parameters of conventional reels used on rapeseed combine harvesters.

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