摘要
为研究弹性齿式剥叶元件的叶鞘剥离机理,进行了弹性齿对甘蔗茎秆的动态打击力试验。设计专用试验台固定甘蔗茎秆的两端,并在固定组件的3个方向安装单向压电型冲击力传感器,剥叶滚筒带动弹性齿在茎秆中部施加打击力,传感器测得纵向、横向和切向动态打击力并得出最大值Fxmax、Fymax和Fzmax。对剥叶滚筒转速、弹性齿与甘蔗茎秆交错深度、侧偏距离和弹性齿材料等4个变量进行单因素试验。分析各因素对打击力的影响规律,得出在样机剥叶试验的最优参数组合下三向动态打击力的最大值。结合叶鞘材料力学特性和剥离准则模型,推导叶鞘的最大破坏力公式,建立叶鞘剥离的力学模型。结果表明,滚筒转速达到700 r/min、交错深度为30 mm、侧偏距离为20 mm、弹性齿材料为聚氨酯(85 HA)时,弹性齿在x和y方向最大打击力Fxmax、Fymax分别为93.87 N和138.26 N,同时大于叶鞘在相应方向的最大破坏力76.40 N和53.53 N,实现叶鞘剥离。
In order to study the mechanism of sugarcane leaf sheath stripping using elastic dentation typed stripping element, the experiments of three-dimensional dynamic hitting force were conducted under the action of elastic dentation on sugarcane stalks. The specialized test bench was designed to fix the stalk at opposite ends by using two fixed components, and one-way type piezoelectric impact sensors were respectively fastened on each fixed component. An elastic dentation driven by the rotating roller hit the middle of the stalk,and the dynamic hitting forces were measured in real time by sensors. After data processing, the maximum values of Fx, Fy and F in longitudinal, transversal, and tangential directions were obtained. Four factors including rotate speed of roller, interleaved depth and lateral offset distance between the elastic dentation and stalk, and material of elastic dentation were determined. Single factor experiments were carried out to analyze the effect of factors and obtain the maximum values of dynamic hitting forces in three directions with the optimal parameters combination. The formula of maximum failure force of leaf sheath stripping was deduced and the mechanical model of leaf sheath striping was established which combined with material mechanics properties and leaf sheath stripping criteria. The results showed that the tested maximum values of Fx and Fy were equaled to 93.87 N and 138.26 N which were greater than the maximum failure force of leaf sheath in x and y directions, 76.40 N and 53.53 N simultaneously, under the condition that the rotate speed of roller was 700 r/min, the interleaved depth was 30 mm, the lateral offset distance was 20 mm, and the material of elastic dentation was polyurethane with shore hardness 85 HA.
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2015年第3期103-109,共7页
Transactions of the Chinese Society for Agricultural Machinery
基金
国家自然科学基金资助项目(51205071)
广西自然科学基金资助项目(2013GXNSFBA019231)
广西师范大学博士科研启动基金资助项目
关键词
甘蔗
叶鞘
剥离
机理
弹性齿
打击力
Sugarcane Leaf sheath Stripping Mechanism Elastic dentation Hitting force
