Development of High-Speed Rotary Harrow for Puddling (Part 2)-Studies on Blade Specifications and Outline of the Developed Rotary Harrow-

  • GOTOH Takashi
    The Japanese Society of Agricultural Machinery Crop Production Machinery and System Department, Bio-oriented Technology Research Advancement Institution Present address: Fundamental Technology Department, Bio-oriented Technology Research Advancement Institution, National Agriculture and Bio-oriented Research Organization
  • HORIO Mitsuhiro
    The Japanese Society of Agricultural Machinery Crop Production Machinery and System Department, Bio-oriented Technology Research Advancement Institution
  • ICHIKAWA Tomohiko
    The Japanese Society of Agricultural Machinery Crop Production Machinery and System Department, Bio-oriented Technology Research Advancement Institution
  • NAGAYA Katsunari
    Developing Group, Kobashi Kogyo Co., Ltd.
  • KUJI Yoshiharu
    Engineering and Developing Department, Sasaki Corporation

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Other Title
  • 高速代かきロータリの開発(第2報)―つめ仕様の検討と開発機の概要―
  • コウソク シロカキ ロータリ ノ カイハツ ダイ2ホウ ツメ シヨウ ノ ケントウ ト カイハツキ ノ ガイヨウ
  • Studies on Blade Specifications and Outline of the Developed Rotary Harrow
  • つめ仕様の検討と開発機の概要

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Abstract

We conducted fundamental tests on the blade of puddling harrows and found the following results. (1) The blade arrangement in which a pair of blades was installed 15mm apart laterally yielded higher performance on soil-pulverizing and residue-burying than the conventional blade arrangement. (2) The PTO specific power of the harrow with rotary blades having a cutting angle of 95° was 5 to 10% lower than that of the harrow with 105° cutting angle blades. However the residue-burying performance of the 95° cutting angle blade was worse than that of the 105° cutting angle blade. (3) Increasing the blade rotating speed 8% degraded the residue-burying performance and increased the PTO specific power by 14%. Based on the results of fundamental tests, we manufactured prototype harrows. These harrows had the following features. (1) A new large rake was installed in front of the rear cover. (2) The arrangement of the blades was changed. (3) The inner volume of the rear cover was larger than that of conventional harrows.

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