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截齒的運動軌跡為平面擺線
來源: | 作者:佚名 | 發布時間: 2021-07-17 | 354 次瀏覽 | 分享到:

      截齒的運動軌跡為平面擺線,鎬型截齒的作業部分為一圓錐體,作業時好像鎬尖楔入煤巖體,在鎬形截齒尖楔入煤巖體的一瞬間,齒尖錐體外表對煤巖體的壓力超越煤體的抗壓強度,使煤巖粉碎,跟著鎬形截齒的楔進,煤巖體內的張力越來越大,直到鎬形截齒周圍的扇形體從煤巖體上碎落下來。

  截齒在截割煤巖時接受高的壓應力、剪切應力和沖擊負荷。煤的硬度雖不很高,但其間有煤矸石等硬的礦料,并且在采煤和鑿巖進程中,截齒溫度會急劇升高,導致齒頂材質軟化,加快了截齒的失效進程。

  截齒在作業進程中,磨粒(煤矸石等)與截齒外表間發作較大的壓應力,帶有鋒利棱角并具有適宜迎角的磨粒能切削截齒外表構成顯微切削。假如磨粒不行尖利或刺入截齒外表視點不適當,會在截齒外表擠出犁溝。


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