莲藕表皮力学特性试验研究  

Experiment on the mechanical properties of the epidermis of the lotus root

作　　者：陈亚欣 曾荣 陈龙 唐楠锐 张妮 张国忠[1] CHEN Yaxin;ZENG Rong;CHEN Long;TANG Nanrui;ZHANG Ni;ZHANG Guozhong(College of Engineering,Huazhong Agricultural University,Key Laboratory of Agricultural Equipment in the MidLower Yangtze River,Ministry of Agriculture and Rural Affairs,Wuhan 430070,China)

机构地区：[1]华中农业大学工学院,农业农村部长江中下游农业装备重点实验室,湖北武汉430070

出　　处：《甘肃农业大学学报》2024年第1期304-312,共9页Journal of Gansu Agricultural University

基　　金：国家特色蔬菜产业技术体系专项资助项目(CARS-24-D-02);湖北省高等学校优秀中青年科技创新团队计划项目(T_(2)01934);湖北省农杨装备补短板核心技术应用攻关项目(HBSNYT_(2)028/8)。

摘　　要：【目的】探究莲藕机械去皮技术,对用于深加工的主藕体外部形状以及表皮力学特性进行了试验研究。【方法】以广泛种植的鄂莲5号主藕体为对象,测量其外形轮廓并进行了统计分析。采用质构仪,以去皮切削极限力为评价指标,以切削方向、取样部位、加载速度为试验因素,开展了全因素试验;以拉伸断裂极限强度为评价指标,以取样部位、拉伸方向为影响因素,开展了全因素试验。【结果】三节主藕体长、宽、高为98.16~238.57 mm、62.51~91.11 mm、57.57~86.48 mm,表皮湿基含水率为80.46%~86.28%;莲藕不同截面孔边距以及内凹外观特性呈现出由最大截面向两端递减的趋势,莲藕去皮厚度t应满足t<3.00 mm。轴向平均切削力分别为(9.13±1.55)、(11.31±1.48)、(12.06±1.10)N,周向平均切削力分别为(10.21±1.97)、(12.88±2.45)、(12.28±1.42)N;取样部位、加载速度对去皮切削力均影响极显著,切削方向对去皮切削力影响显著;三节主藕体藕皮轴向平均拉伸强度分别为(1.41±0.15)、(1.29±0.260)、(1.08±0.22)MPa,周向平均拉伸强度分别为(0.62±0.09)、(0.67±0.25)、(0.71±0.19)MPa;方向对藕皮拉伸强度影响极显著,藕皮轴向拉伸强度大于周向。【结论】沿周向设计仿形机械去皮机构,通过提高切削速度以减小切削阻力,提高机械去皮效率。【Objective】In order to explore the mechanical peeling technology of lotus root,the external shape and skin mechanical properties of main lotus root for deep processing were studied.【Method】Taking the widely planted main lotus root of E lian NO.5 as the object,the dimensions,the distance between the cross-sectional pores and the surface(short for hole margin),and the cross-sectional contour were measured and statistically analyzed.The cutting and tensile characteristics of the lotus root epidermis were investigated by using a texture analyzer,with the peeling cut limit force as the evaluation index,the cutting direction,the sampling site and the loading speed as the test factors.The ultimate tensile strength was used as the evaluation index,and the sampling site and tensile direction were used as the influencing factors.【Result】The body length,width and height of the three main sections were 98.16~238.57 mm,62.51~91.11 mm and 57.57~86.48 mm,and the epidermal water content was 80.46%~86.28%.The cross-sectional outline of lotus root shows concave and convex appearance characteristics,and the axial hole edge distance and concave appearance characteristics show a decreasing trend from the maximum section to both ends.In order to reduce the damage of the lotus root body during mechanical cutting,the peeling thickness t of lotus root should be t<3.00 mm.The average axial cutting force was(9.13±1.55),(11.31±1.48),(12.06±1.10)N,and the average circumferential cutting force was(10.21±1.97),(12.88±2.45),(12.28±1.42)N,respectively.The specimen location and loading speed have a significant influence on the peel cutting force,and the cuting direction has significant influence on the peeling cut force.The average axial tensile strength of the root skin of the three main sections was(1.41±0.15),(1.29±0.260),(1.08±0.22)MPa,and the average circumferential tensile strength was(0.62±0.09),(0.67±0.25),(0.71±0.19)MPa,respectively.The axial tensile strength of lotus root skin is higher than that of the circumfer

关 键 词：莲藕 去皮加工 剪切力 拉伸强度 力学特性 

分 类 号：S645.1[农业科学—蔬菜学] TS255.5[农业科学—园艺学]