水稻钵苗移栽下坠高度及导管摩擦对栽深的影响

该文通过对钵苗落差高度与栽植深度关系和秧苗钵体相对于导管不同材料的动、静摩擦系数的试验研究,为导管式分秧栽植机构的设计提供理论依据.试验结果表明:水稻钵体秧苗的栽植深度随钵苗落差高度的增加而增加;对一般水田土壤类型,在整地质量满足农艺要求的条件下,钵苗落差高度在0.75～1.50 m范围内时,秧苗栽植深度为4.8～12.5 mm,可以满足秧苗栽深的农艺要求;秧苗钵体相对于钢板和塑料板的摩擦系数变化不大,受秧苗钵体相对湿度的影响较大,且随钵体相对湿度的增加而增加,在相对湿度为80%左右时达到最大值;一般情况下,在机器设计中,可取摩擦系数的最大值为0.7,摩擦角为35°.

Effects of falling height of potted-seedling and friction characteristics with materials of canal on planting depth

In this article, the relationship between the falling height and the planting depth of seedlings and the static and kinetic friction coefficients between the potted-seedling bowls and different materials of canal were researched, which provides the theories for designing the rice potted seedling transplanter. The experimental results show that the planting depth of seedlings increases when the falling height of seedlings increases. In the common soil and the field in normal quality, the planting depth of seedlings is between 4.8 mm and 12.5 mm when the falling height of seedlings is between 0.75 m and 1.5 m, the depth meets agricultural requirement. The friction coefficient between the potted-seedling bowl and the steel plate is almost the same as that between the potted-seedling bowl and plastic plate. The planting depth is affected by the relative humidity of the potted-seedling bowl. The planting depth increases when the relative humidity increases and it is the most when the relative humidity is about 80 percent. When designing machines, it is adopted that the max friction angle is 35° and the friction coefficient is 0.7.