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2.、滾珠絲杠副(fu)由于傳(chuan)動(dong)鏈(lian)效率高,不能自鎖,在用(yong)于垂直方法(fa)傳(chuan)動(dong)鏈(lian)時,如部(bu)件(jian)重(zhong)量未加平衡,須得防(fang)止(zhi)傳(chuan)動(dong)鏈(lian)停(ting)止(zhi)或調速電機失電后(hou),因(yin)部(bu)件(jian)自重(zhong)而產(chan)生的逆傳(chuan)動(dong)鏈(lian),防(fang)逆傳(chuan)動(dong)鏈(lian)方法(fa)可用(yong)渦輪螺(luo)桿傳(chuan)動(dong)鏈(lian),液壓(ya)式電器(qi)制動(dong)器(qi)及超越離合器(qi)等。
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