（1）起(qi)(qi)重(zhong)(zhong)量限制器(qi)：也稱超載(zai)限位器(qi)、是一(yi)種(zhong)能使起(qi)(qi)重(zhong)(zhong)機不致超負荷運行的(de)保(bao)險裝置，當吊重(zhong)(zhong)超過額(e)定起(qi)(qi)重(zhong)(zhong)量時，它能自(zi)動地切斷提升機構的(de)電源(yuan)停車或(huo)發出警報。起(qi)(qi)重(zhong)(zhong)限制器(qi)有機械式和電子式兩種(zhong)。

（2）力矩(ju)限(xian)制器：對(dui)于變(bian)幅(fu)起重(zhong)(zhong)(zhong)機，一定(ding)的(de)幅(fu)度只允(yun)許(xu)起吊(diao)一定(ding)的(de)吊(diao)重(zhong)(zhong)(zhong)，如(ru)果超重(zhong)(zhong)(zhong)，起重(zhong)(zhong)(zhong)視便(bian)有(you)傾翻的(de)危險(xian)。力矩(ju)限(xian)制器便(bian)是根據這個(ge)特點(dian)研制出的(de)一種(zhong)(zhong)保護裝置。在某(mou)一定(ding)幅(fu)度，如(ru)果吊(diao)物超出了其相(xiang)應的(de)重(zhong)(zhong)(zhong)量，電路便(bian)被(bei)切斷，使提升(sheng)不(bu)能進行，為保起重(zhong)(zhong)(zhong)機的(de)穩定(ding)。力矩(ju)限(xian)制器有(you)機械式(shi)、電子式(shi)和復(fu)合(he)式(shi)三(san)種(zhong)(zhong)。

（3）高(gao)度(du)限(xian)制(zhi)器：也稱吊(diao)鉤(gou)高(gao)度(du)限(xian)位(wei)器．一般都(dou)裝在起重臂的頭(tou)部(bu)，當吊(diao)鉤(gou)滑升到極限(xian)位(wei)置(zhi)，便托起杠(gang)桿。壓(ya)下(xia)限(xian)位(wei)開關，切斷電路停(ting)車，再合閘時，吊(diao)鉤(gou)只能下(xia)降。

（4）行(xing)(xing)(xing)(xing)程(cheng)(cheng)限(xian)(xian)制器：防止起重機發生撞車(che)(che)或限(xian)(xian)制在一(yi)定范圍內行(xing)(xing)(xing)(xing)駛的保(bao)險裝(zhuang)(zhuang)置。它一(yi)般安(an)裝(zhuang)(zhuang)在主動臺車(che)(che)內側，主要是安(an)裝(zhuang)(zhuang)一(yi)個可以(yi)撥動扳把(ba)的行(xing)(xing)(xing)(xing)程(cheng)(cheng)開關。另在軌道的端頭（在運(yun)行(xing)(xing)(xing)(xing)限(xian)(xian)定的位置）安(an)裝(zhuang)(zhuang)一(yi)個固定的極限(xian)(xian)位置擋(dang)(dang)板，當(dang)塔(ta)吊(diao)運(yun)行(xing)(xing)(xing)(xing)到(dao)這個位置時，極限(xian)(xian)擋(dang)(dang)板即碰觸行(xing)(xing)(xing)(xing)程(cheng)(cheng)開關的扳把(ba)，切斷控(kong)制行(xing)(xing)(xing)(xing)走的電源，再合閘時塔(ta)吊(diao)只(zhi)能向(xiang)相反方向(xiang)運(yun)行(xing)(xing)(xing)(xing)。

（5）幅(fu)度(du)限(xian)(xian)制器：也(ye)稱(cheng)變幅(fu)限(xian)(xian)位(wei)(wei)或幅(fu)度(du)指(zhi)示(shi)器，一般(ban)的動(dong)臂(bei)(bei)起重機的起重臂(bei)(bei)上(shang)都(dou)掛有(you)一個幅(fu)度(du)指(zhi)示(shi)器。它是由(you)一個固定的圓形(xing)指(zhi)示(shi)盤(pan)，在盤(pan)的中心裝(zhuang)一個鉛垂的活動(dong)指(zhi)針。當變幅(fu)時，指(zhi)針指(zhi)示(shi)出各(ge)種(zhong)幅(fu)度(du)下的額(e)定起重量。當臂(bei)(bei)桿(gan)運行到上(shang)下兩(liang)個極限(xian)(xian)位(wei)(wei)置(zhi)時，分別壓下限(xian)(xian)位(wei)(wei)開關，切斷主控電路，變幅(fu)電機停車，達到限(xian)(xian)位(wei)(wei)的作(zuo)用。