PROBLEM TO BE SOLVED: To provide a subsoiler that can efficiently crush a hardpan in a farm field.SOLUTION: The subsoiler includes: a cylindrical body 20 provided with a horizontal shaft a plurality of bar-like air injection claws 10 protruded radially outward and a compressor 30 for supplying compressed air. The air injection claw 10 includes: a tubular part 11 a side hole 11a formed on the tubular part 11, and a slide part 13 inserted to the tubular part to be slidable relative to the inner surface thereof. The slide part 13 includes: a compressed air flow passage 13a provided inside an ejection hole 13b opened to a side surface thereof a valve 13c switched between an open state for allowing communication with the inside of the cylindrical body 20 and a close state for interrupting the communication a coil spring 12 and a tip 13e3 protruded beyond the tubular part 11. When the tip 13e of the slide part 13 is pressed in the ground, the slide part 13 compresses and moves the coil spring 12 to put the valve 13c into the open state, and the compressed air within the cylindrical body 20 is ejected through the ejection hole 13b.COPYRIGHT: (C)2013,JPO&INPIT【課題】圃場の硬盤を効率的に破砕する硬盤破砕機を提供する。【解決手段】水平軸を具備する円筒体20と、径方向外方に突出する複数の棒状の空気注入爪10と、圧縮空気を供給するコンプレッサ30と、を備え、空気注入爪10は、管状部11と、管状部11の側面孔11aと、内面に対してスライド可能に挿入されたスライド部13と、を備え、スライド部13は、内部に設けられた圧縮空気流路13aと、側面に開口する噴出孔13bと、円筒体20の内部と連通させる開状態と遮断させる閉状態との間で切り替わるバルブ13cと、コイルスプリング12と、管状部11よりも突出する先端部13e3とを備え、スライド部13の先端部13eが地中で押されると、スライド部13がコイルスプリング12を圧縮して移動してバルブ13cが開状態となり、円筒体20の内部の圧縮空気が噴出孔13bを介して噴出する。【選択図】図1
