Effects of Stem Moisture Content, Length of Lever Arm, Region of Cut and Cutting Attempts on the Cutting Efficiency of a Push-Type Cassava Stem Cutter and Harvester

Asian journal of agriculture and food science Pub Date : 2020-10-24 DOI:10.24203/ajafs.v8i5.6295

I. M. Gana, A. Gbabo, I. S. Egbe-Okpenge

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Abstract

I Cassava harvesting is viewed as the most arduous operation in its production chain, involving three main sequential operations from stem cutting, soil loosening and then uprooting of the tubers. A semi-mechanised cassava stem cutter and harvester was developed to aid mitigate the drudgery involved in cassava harvesting. The machine was designed to carry out three main operations which include stem cutting, soil loosening and tuber harvesting. A precise knowledge of agronomic, physical and mechanical properties of the stem and factors affecting cassava harvesting most especially stem cutting plays a vital role in an attempt to overcome the existing challenges associated with the harvesting. The effects of stem girth, region of cut, cutting attempts and stem moisture content on cutting efficiency was investigated. The result of the experiment revealed that the cutting efficiency ranged from 3 to 99.5%. The highest cutting efficiency of 99.5% was obtained from combination of stem moisture content of 85%, length of lever arm from fulcrum of 65 cm, region of cut above ground level of 30 cm and number of cutting attempts 3. The lowest cutting efficiency of 3% was obtained from combination of stem moisture content of 45%, length of lever arm from fulcrum of 65 cm, region of cut above ground level of 30 cm and number of cutting attempts 3. The optimization process produced solutions whose desirability equals to 1 and the selected (most desirable) condition was found to be: stem moisture content (75%), length of lever arm from fulcrum (70 cm), region of cut above ground level (40 cm) and cutting attempts (4), with cutting efficiency and desirability of 99.5% and 0.959 respectively. These findings are vital knowledge necessary in the development of cassava stem cutting and harvesting equipment. Keywords— A Cassava harvester, cutter, efficiency, moisture, region of cut, stem _________________________________________________________________________________

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茎含水量、杆臂长度、切割区域和切割次数对推式木薯切割机和收获机切割效率的影响

木薯收割被认为是其生产链中最艰巨的工序，涉及三个主要的连续操作:茎切、土壤松动，然后将块茎连根拔起。开发了一种半机械化木薯茎切割机和收获机，以帮助减轻木薯收获的苦差事。该机器设计用于进行三种主要操作，包括茎切、土壤松动和块茎收获。准确了解木薯茎秆的农艺、物理和机械特性以及影响木薯收获的因素，尤其是茎秆切割，对于克服与收获相关的现有挑战至关重要。研究了茎周长、切割面积、切割次数和茎含水量对切割效率的影响。实验结果表明，切削效率在3% ~ 99.5%之间。当茎干含水率为85%、杠杆臂距支点长度为65 cm、切割距地面面积为30 cm、切割次数为3时，切割效率最高，达99.5%。当茎干含水率为45%、杠杆臂距支点长度为65 cm、切割距地面面积为30 cm、切割次数为3次时，切割效率最低，为3%。优化过程得到理想度为1的解，优选的最理想条件为:茎干含水率75%，杠杆臂距支点长度70 cm，切割距地面40 cm，切割次数4次，切割效率和理想度分别为99.5%和0.959。这些发现是开发木薯茎切割和收获设备所必需的重要知识。关键词——木薯收获机、切割机、效率、水分,减少,干 _________________________________________________________________________________

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Asian journal of agriculture and food science

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