Study on the Dynamic Frictional Coefficient between Rice Seedling Band and Feed Table

Abstract

Tear down of seedling-band on the feed table has been a handicap to obtain good performance of the rice-seedling-transplanting machine. This, as was observed, was considerably influenced by friction between the seedling-band and the feed table.
In this paper, it is tried to answer this problem by obtaining dynamic frictional coefficient of the band with various materials for the feed table.
The results are as follows:
1) The average dynamic frictional coefficient of the seedling-band was about 1.23. There were no clear relationships between this value and number of seedling per unit length of band.
2) The dynamic frictional coefficient was very much influenced by moisture condition of the band and kind of soil used.
This value was small by using band of low moisture content, and the value obtained from sandy loam band was larger than that from clayey loam band.
3) There was no significant difference in the value of dynamic frictional coefficient between polyurethane and fushokufu (unweaved cloth) as seedling-band supporter
4) Dynamic frictional coefficients of various materials such as steel, aluminum, teflon, vinyl chloride, and copper were measured. The smallest value was obtained from teflon, and large values from copper and aluminum.
5) As a conclusion it is suggested that present problem can be reduced to a certain extent by replacing the materials of feed table with teflon.