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釆煤機截齒的工作過程
來源: | 作者:佚名 | 發布時間: 2021-02-28 | 444 次瀏覽 | 分享到:
釆煤機截齒的工作過程為：在截齒前刃面作用下，煤發生破碎，同時產生大塊的剝離
釆煤機截齒的工作過程
     釆煤機截齒的工作過程為：在截齒前刃面作用下，煤發生破碎，同時產生大塊的剝離。在刀尖開始接觸煤的瞬間，刀尖接觸范圍內產生彈性和塑性變形，隨著接觸應力增大，超過強度極限時，被壓碎成很細的粉末形成密實核，這種密實核由處于受壓狀態下的粉碎煤組成，并且隨著截割刀具的推進，密實核逐漸長大并集聚能量，截割阻力亦隨之增大。密實核使前面一層煤區域受擠壓，并使這一部分產生彈性變形。由于密實核周圍礦體形成應力狀態區，實際上起著改變截齒刀頭的幾何形狀的作用。當截齒刀尖的接觸應力增加到極限值時，密實核前區域中的粉塵高速噴出，帶動小塊剝落。
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