防(fang)止(zhi)室(shi)外(wai)起(qi)重(zhong)機(ji)在(zai)強(qiang)風(feng)作(zuo)用(yong)下(xia)沿(yan)軌(gui)道(dao)滑(hua)行(xing)的(de)起(qi)重(zhong)機(ji)安(an)全(quan)裝(zhuang)置(zhi)。通(tong)常(chang)采(cai)用(yong)與(yu)起(qi)重(zhong)機(ji)底(di)部(bu)結(jie)構(gou)連(lian)接(jie)在(zai)一(yi)起(qi)的(de)夾(jia)鉗(qian)
，夾(jia)住(zhu)軌(gui)道(dao)頭(tou)部(bu)的(de)兩(liang)個(ge)側(ce)麵(mian)來(lai)防(fang)止(zhi)滑(hua)行(xing)。夾(jia)軌(gui)器(qi)分(fen)手(shou)動(dong)式(shi)和(he)電(dian)動(dong)式(shi)兩(liang)種(zhong)(見圖)。手動夾軌器一般為螺杆式，結構簡單
，但夾緊力小、動(dong)作(zuo)慢(man)，主(zhu)要(yao)用(yong)於(yu)在(zai)擋(dang)風(feng)麵(mian)積(ji)不(bu)大(da)的(de)中(zhong)小(xiao)型(xing)或(huo)臨(lin)時(shi)性(xing)用(yong)途(tu)的(de)起(qi)重(zhong)機(ji)上(shang)。大(da)型(xing)起(qi)重(zhong)機(ji)或(huo)港(gang)口(kou)用(yong)起(qi)重(zhong)機(ji)主(zhu)要(yao)采(cai)用(yong)電(dian)動(dong)夾(jia)軌(gui)器(qi)。它(ta)是(shi)由(you)重(zhong)錘(chui)通(tong)過(guo)杠(gang)杆(gan)或(huo)由(you)彈(dan)簧(huang)力(li)使(shi)夾(jia)鉗(qian)夾(jia)緊(jin)軌(gui)道(dao)

，靠(kao)液(ye)壓(ya)係(xi)統(tong)中(zhong)油(you)缸(gang)力(li)鬆(song)開(kai)夾(jia)鉗(qian)。重(zhong)錘(chui)式(shi)較(jiao)笨(ben)重(zhong)，外(wai)形(xing)尺(chi)寸(cun)大(da)，夾(jia)緊(jin)力(li)比(bi)彈(dan)簧(huang)式(shi)的(de)小(xiao)，工(gong)作(zuo)平(ping)穩(wen)性(xing)也(ye)不(bu)如(ru)彈(dan)簧(huang)式(shi)的(de)。電(dian)動(dong)彈(dan)簧(huang)式(shi)夾(jia)軌(gui)器(qi)通(tong)過(guo)風(feng)速(su)儀(yi)與(yu)起(qi)重(zhong)機(ji)實(shi)現(xian)電(dian)氣(qi)聯(lian)鎖(suo)
，當(dang)風(feng)速(su)儀(yi)檢(jian)測(ce)的(de)風(feng)力(li)達(da)到(dao)不(bu)能(neng)保(bao)證(zheng)起(qi)重(zhong)機(ji)正(zheng)常(chang)作(zuo)業(ye)的(de)風(feng)級(ji)(通常相應於6~7級)時，起重機斷電，夾鉗夾住軌道。這種夾軌器的工作可靠性較高。