絲杠傳動也就是指螺旋傳動,它主要應用在一些精密的傳動機械設備及儀器當中.在光學測量儀中的三坐標測量儀就有用(yong)到(dao)這種傳(chuan)動(dong)(dong)工具.它(ta)的主要(yao)功(gong)(gong)能是(shi)(shi)將旋轉運動(dong)(dong)變為直(zhi)線(xian)運動(dong)(dong).起到(dao)一個扭轉軸(zhou)承及作用(yong)力方向的功(gong)(gong)能.在三坐標(biao)測(ce)(ce)量(liang)儀中,它(ta)則是(shi)(shi)起到(dao)一個位(wei)(wei)移的傳(chuan)動(dong)(dong)作用(yong).在計算機(ji)的操作指令(ling)下(xia),驅動(dong)(dong)機(ji)構(gou)能將運動(dong)(dong)部件(jian)準確(que)(que)地移到(dao)所需(xu)(xu)位(wei)(wei)置(zhi).從(cong)原理上來說,三坐標(biao)測(ce)(ce)量(liang)儀是(shi)(shi)根據標(biao)尺系(xi)統反(fan)饋(kui)回來的信息去確(que)(que)定(ding)運動(dong)(dong)部件(jian)是(shi)(shi)否已經到(dao)達所需(xu)(xu)位(wei)(wei)置(zhi).驅動(dong)(dong)機(ji)構(gou)的傳(chuan)動(dong)(dong)誤差(cha)不會(hui)直(zhi)接引起定(ding)位(wei)(wei)誤差(cha),但若驅動(dong)(dong)機(ji)構(gou)精密度不高,或(huo)有空行(xing)程,爬(pa)行(xing)現(xian)象,便會(hui)延(yan)長準確(que)(que)定(ding)位(wei)(wei)有利.有些(xie)絲(si)杠傳(chuan)動(dong)(dong)系(xi)統還具有自鎖性能.只要(yao)絲(si)杠停止運動(dong)(dong),運動(dong)(dong)部件(jian)就不會(hui)在慣性或(huo)者重(zhong)力作用(yong)下(xia)繼續(xu)運動(dong)(dong).這對Z軸(zhou)的影像探測(ce)(ce)系(xi)統很重(zhong)要(yao),即使Z軸(zhou)平衡不好,也不會(hui)在自重(zhong)作用(yong)下(xia)自行(xing)下(xia)垂(chui),損壞鏡頭.
絲杠傳動(dong)的(de)傳動(dong)比大,有利于提高分辨力,實(shi)(shi)現(xian)精(jing)確定(ding)位(wei),但卻(que)不利于實(shi)(shi)現(xian)快速驅(qu)動(dong),有的(de)三坐(zuo)標測量儀為了實(shi)(shi)現(xian)快速驅(qu)動(dong),可將絲杠的(de)螺母打開(kai),改用(yong)其它(ta)方式(shi)直接驅(qu)動(dong)運動(dong)部件.
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