| 摘要: |
| 设计一种适用于棉秆等硬质茎秆，配套打捆机作业的滚筒式铡切机构。该机构采用先破碎后铡切的滚筒式刀组和安装于机架上的定刀配合作业将棉秆切断。滚筒式刀组采用破碎板与铡切刀在圆周上交错布置的方式，实现对棉秆先破碎后铡切的作业，减轻铡切刀的磨损，降低铡切作业功耗。根据棉秆特性，确定关键部件的参数，并运用SolidWorks Simulation软件对铡切刀进行静强度校核和对滚筒式铡切机构进行模态分析，研究铡切刀的应力、应变分布和滚筒式铡切机构的固有频率和振型。结果表明：铡切刀最大应力和最大变形均发生在螺栓孔处，分别为234.6×106 N/m2和7.521×10-4mm，铡切刀材料选用65Mn钢材，可满足性能要求；滚筒式铡切机构的最低阶固有频率为53.675 Hz，高于其工作激励频率6.5 Hz，不会形成共振。对该机构的主要性能进行试验，结果表明：当铡切滚筒以185 r/min旋转时，棉秆的铡切长度合格率为95.31%，消耗功率约30 kW。 |
| 关键词: 棉秆 滚筒式铡切机构 破碎板 铡切刀 |
| DOI：10.11841/j.issn.1007-4333.2018.09.16 |
| 投稿时间：2017-11-20 |
| 基金项目:山东省农机装备研发创新计划项目（2016YF038）；国家自然科学基金项目（51505242）；农业部现代农业装备重点实验室开放课题（201604001）；滨州市科技发展计划项目（2015ZC0106） |
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| Design and experiment of a roller type cotton stalk cutting mechanism |
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LIAO Peiwang1, LIU Kaikai1, CHEN Mingjiang2, WANG Zhenwei2, ZHANG Aimin1
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| (1.Binzhou Agricultural Mechanization Science Research Institute, Binzhou 256600, China;2.Nanjing Research Institute for Agricultural Mechanization of Ministry of Agriculture, Nanjing 210014, China) |
| Abstract: |
| A roller type cotton stalk cutting mechanism with crushing plate and cutting knife was designed this study,which was suitable for cutting cotton stalk bundling. Cotton stalk was chopped by rotary knife after crushing and the fixed knife mounted on the frame of bundling machine. In order to achieve the function of cutting after crushing of cotton stalk and reduce the consumption of cutting tools and power consumption, the rotary knife group was adopted the way of which the crushing plate and cutting knife were arranged interlaced in the circle. According to the characteristics of cotton stalk, the parameters of the key components are identified. And SolidWorks Simulation software was then used to check the static strength finite element analysis of cutting knife and the modal analysis of roller type cutting mechanism, and the stress and strain distribution of cutting knife. The natural frequency and vibration mode of roller type cotton stalk cutting mechanism were investigated. The results of finite element analysis showed that the maximum stress and the maximum deformation of the cutting knife all were occurred on the bolt hole, and the values of which was respectively 234.6×106 N/m2 and 7.521×10-4mm. The materials of the cutting knife was 65Mn steel to meet the performance requirements. The work frequency of the roller type cutting mechanism (6.5 Hz) was far below its first natural frequency (53.675 Hz).The main performance of the model machine was tested, and the experimental results showed that the qualified rate of cotton stalk crushing was 95.3%, when roller type cotton stalk cutting mechanism with crushing plate and cutting knife was at 185 r/min speed of the cutting drum, the power consumption was 30 kW. |
| Key words: cotton stalk roller type cutting mechanism crushing plate cutting knife |
