Abstract
Although the individual threshing drum of a combine harvester was balanced on a dynamic balancing machine before it is assembled, there were still unbalances after multiple drums were assembled with the chain drive. In this paper, the double drums with a chain drive of a crawler combined harvester were selected as the research subject. The aim of this study was to develop a dynamic unbalance mode for grading chain drive double drums. Based on the dynamic unbalance characteristics of the main driven drum, the experimental research on the radial balance of the driven drum end face was carried out. It was known that the chain drive had a direct and obvious influence on the unbalanced phase of the drum. The unbalance of the drive load had an obvious effect on unbalanced amplitude of an active drum through the transfer characteristics of the chain drive. For the multi-stage transmission characteristics of a combine harvester, a step-by-step balanced grading chain drive double drum dynamic balancing method was practiced. Results showed that the unbalanced amplitude after balancing threshing drum I chain transmission mode of the combine harvester can be reduced by a maximum of 91%. Simultaneously, the unbalanced amplitude of threshing drum II can reduced by a maximum of 69.2%. The size and position of the wrap angle of the chain drive would directly affect the phase of the two equivalent unbalanced masses.
Highlights
A drum is widely used in agricultural machinery, and unbalance of a drum exacerbates the vibration and noise of the whole machine [1,2,3]
It can be seen that the side chain drive affected the unbalanced state of the threshing drum from this phase change
After the load was driven, the transmission chain between the load and the driving drum generated a tensile force and a lateral vibration, which had an obvious influence on the unbalanced phase of the main driven drum
Summary
A drum is widely used in agricultural machinery, and unbalance of a drum exacerbates the vibration and noise of the whole machine [1,2,3]. A threshing drum is the main working part of a rice combine harvester for crop threshing separation. It is usually balanced on the dynamic balancing machine before it is assembled, there is still unbalances after the multiple threshing drums are assembled by a chain drive [6,7,8]. The unbalanced state of a threshing drum will exacerbate the meshing vibration while chain driven [9]. The lateral vibration will generate a large dynamic load, which will aggravate the jitter of the chain
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