自(zi)動(dong)(dong)(dong)(dong)扶梯(ti)(ti)由梯(ti)(ti)路（變型的板式輸送機）和兩(liang)旁的扶手（變形(xing)的帶式輸送機）組成。其主要(yao)部件有梯(ti)(ti)級(ji)(ji)(ji)、牽引鏈條及(ji)鏈輪、導(dao)軌(gui)(gui)系統、主傳動(dong)(dong)(dong)(dong)系統（包括電(dian)動(dong)(dong)(dong)(dong)機、減(jian)速裝(zhuang)置、制(zhi)動(dong)(dong)(dong)(dong)器及(ji)中間傳動(dong)(dong)(dong)(dong)環節等）驅動(dong)(dong)(dong)(dong)主軸、梯(ti)(ti)路張緊(jin)裝(zhuang)置、扶手系統、梳板、扶梯(ti)(ti)骨架和電(dian)氣系統等。梯(ti)(ti)級(ji)(ji)(ji)在(zai)乘(cheng)客入口(kou)處(chu)作(zuo)水(shui)平(ping)運動(dong)(dong)(dong)(dong)（方便乘(cheng)客登(deng)梯(ti)(ti)）以后(hou)逐漸形(xing)成階(jie)梯(ti)(ti)；接近(jin)入口(kou)處(chu)階(jie)梯(ti)(ti)逐漸消失，梯(ti)(ti)級(ji)(ji)(ji)再度作(zuo)水(shui)平(ping)運動(dong)(dong)(dong)(dong)。這些運動(dong)(dong)(dong)(dong)都是由梯(ti)(ti)級(ji)(ji)(ji)主輪、輔輪分別沿不同的梯(ti)(ti)級(ji)(ji)(ji)導(dao)軌(gui)(gui)行走(zou)來實現的。

自(zi)動扶梯的(de)速(su)度范圍是(shi)從27米(mi)/分至55米(mi)/分。一個移動速(su)度為44米(mi)/分的(de)自(zi)動扶梯在一小時內(nei)可(ke)承(cheng)載1萬多人，比標準電梯的(de)承(cheng)載人數多得多。