養殖ホタテ稚貝の耳揃え制御方法に関する研究

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タイトル別名
  • Studies on Posture Control for Automatic Holing in Ear Groove of Juvenile Scallop
  • ヨウショク ホタテ チガイ ノ ミミソロエ セイギョ ホウホウ ニカンスルケン

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抄録

Scallop culturing by ear-hanging method demands drilling of hole in the ear groove on the left shell for which an equipment for automatic in-line positioning and posturing of the scallop shell is required. The authors develope such an equipment with revolving rollers, and discuss mechanical conditions for controling posture of scallop shell. The results are summarized as follows. The characteristic of the scallop shell's contour is that while most part of its contour is circular shape, it has a straight line part at the ear. Under the action of the two revolving rollers, the vertically positioned scallops start revolving between two holding plates and when the ear of scallop gets into the gap of the two rollers, it stops rotating with the ear facing down and the ventral margin up. Thus, automatic posturing of the scallops is made possible. When the gap S between two rollers is (0.54-0.77)L, the gap B between two holding plates is (1.09 -1.15) W, the revolution number 71 of the rollers is from 84 to 212 rpm and the diameter of the roller is less than 0.34L, the success rate of posturing of ears reaches 100 %. where L : length of shell, W :Width of shell.

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