| 曲柄摇杆振动破壳油茶果粗选机运动学分析及试验 |
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| 引用本文： | 李立君,胡文宇,高自成,闵淑辉,王朋辉.曲柄摇杆振动破壳油茶果粗选机运动学分析及试验[J].农业工程学报,2016,32(7):28-35. |
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| 作者姓名： | 李立君 胡文宇 高自成 闵淑辉 王朋辉 |
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| 作者单位： | 中南林业科技大学机电工程学院,长沙,410004 |
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| 基金项目： | 湖南省高校科技创新团队支持计划资助（2014207） |
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| 摘 要： | 为验证所设计的油茶果粗选机的合理性,该文首先对其进行简化,联系振动筛工作原理和受力分析对其运动参数进行分析,找出影响物料运动的因素,并验证其运动参数设计合理;其次利用ADAMS仿真软件对该机进行运动仿真,得到物料模型的振幅曲线图,通过使用振幅递减法分析曲线图的变化规律,验证其振幅设计合理;最后通过三水平三因素正交组合试验,得出各因素对茶籽保有率和筛分效率的影响显著性顺序。利用Design-Expert软件分析得出当粗选机曲柄转速、筛面倾角、筛面长度取值为276.12 r/min、6.69°、1 005.8 mm时,茶籽保有率和筛分效率均达最佳值(分别为96.84%和96.77%),验证了粗选机的设计满足工作要求。该研究结果为后期精选机的设计提供了参考。
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| 关 键 词： | 机械化 优化 计算机仿真 运动学分析 振动筛 曲柄摇杆机构 清选 油茶果 |
| 收稿时间： | 2015/6/25 0:00:00 |
| 修稿时间： | 2016/2/23 0:00:00 |
Kinematics analysis and experiment of crank rocker vibrating coarse sorting machine for unshelled oil-tea fruit |
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| Li Lijun,Hu Wenyu,Gao Zicheng,Min Shuhui and Wang Penghui.Kinematics analysis and experiment of crank rocker vibrating coarse sorting machine for unshelled oil-tea fruit[J].Transactions of the Chinese Society of Agricultural Engineering,2016,32(7):28-35. |
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| Authors: | Li Lijun Hu Wenyu Gao Zicheng Min Shuhui and Wang Penghui |
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| Institution: | Mechanical and Electrical Engineering Institute, Central South University of Forestry and Technology, Changsha 410004, China,Mechanical and Electrical Engineering Institute, Central South University of Forestry and Technology, Changsha 410004, China,Mechanical and Electrical Engineering Institute, Central South University of Forestry and Technology, Changsha 410004, China,Mechanical and Electrical Engineering Institute, Central South University of Forestry and Technology, Changsha 410004, China and Mechanical and Electrical Engineering Institute, Central South University of Forestry and Technology, Changsha 410004, China |
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| Abstract: | Abstract: Nowadays because the separation step of shell and seed of oil-tea fruit wants to reach the ideal effect by one pace, they can not get satisfactory separation rate of shell and seed. In our study, we determine to choose roughing at first, and then select cleaning method. In order to improve the efficiency of the late selection and separation, design an oil-tea fruit coarse sorting machine which is simple in structure and convenient in manipulation and easy to latter careful sorting. Its work is to shell big shells, break tea fruit, without breaking separate tea fruit and dross among the mixture of shells and seeds of oil-tea fruits which are broken. And leave small broken shells and intact tea seed into the next selection. Now, this paper wants to proof the rationality of the design of oil-tea fruit roughing machine. First, we simplify it as crank and rocker mechanism, and analyze it with the principle of the screening. When the speed of screen increases, materials collide with the edge of the mesh, and pile up on the screen and are difficult to go through the screen; and on the other hand when the speed of screen decreases, the interaction between material particles and sieve is small, which leads to lower screening efficiency. Then, we analyze the motion parameters of coarse sorting machine through the force analysis, and there are 3 kinds of forces on the material and a kind of inertia force. We use static balance and dynamic static to analyze the material which has a tendency to slide along the screen surface. Through the analysis, we conclude that the motion parameters meet the design requirements. Second, we carry out the coarse sorting machine's dynamic simulation and analysis through ADAMS software toward the 5 equidistant material models placed on the model screen surface position. Combining the work principle of shaker with ADAMS software, carry out the kinematics simulation analysis, and get the curves of the amplitude of 5 material models. By using the law of diminishing amplitude we analyze the change of screen surface amplitude and validate that the amplitude design of coarse sorting machine is reasonable. Third, through orthogonal combination experiment of 3 levels and 3 factors, it is concluded that for the influence on the retention rate of seed, the incline angle of screen surface ranks first, the screen length ranks second and the crank speed comes last. And as for the influence on screening efficiency, the order from high to low is the screen length, the incline angle of screen surface, and the crank speed. Besides, by analyzing the response surface, it is concluded that the influence of crank speed and screen length on the retention rate of seed interacts with that on screening efficiency. Then use Design-Expert software to obtain the optimum working conditions of oil-tea fruit roughing machine. When the crank speed is 276.12 r/min, the incline angle of screen surface is 6.69°, and the screen length is 1005.8 mm, we can get the optimum retention rate of seed, which is 96.84%, and also the optimum screening efficiency, which is 96.77%. Oil-tea fruit roughing machine meets the design requirement. The research results provide a reference for the design of later accurate selection machine. |
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| Keywords: | mechanization optimization computer simulation kinematics analysis shaker crank and rocker mechanism coarse sorting oil-tea fruit |
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