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顎(e)式破(po)(po)碎(sui)機的(de)(de)(de)工作(zuo)部(bu)分(fen)是兩(liang)塊顎(e)板(ban)(ban)(ban)，一是固定(ding)(ding)(ding)顎(e)板(ban)(ban)(ban)（定(ding)(ding)(ding)顎(e)），垂直（或上(shang)端略外傾）固定(ding)(ding)(ding)在機體前壁上(shang)，另一是活動顎(e)板(ban)(ban)(ban)（動顎(e)），位置傾斜，與固定(ding)(ding)(ding)顎(e)板(ban)(ban)(ban)形(xing)成上(shang)大(da)下小的(de)(de)(de)破(po)(po)碎(sui)腔(qiang)（工作(zuo)腔(qiang)）。活動顎(e)板(ban)(ban)(ban)對(dui)著(zhu)固定(ding)(ding)(ding)顎(e)板(ban)(ban)(ban)做周期性的(de)(de)(de)往(wang)復運動，時而分(fen)開，時而靠(kao)近(jin)。分(fen)開時，物料進入破(po)(po)碎(sui)腔(qiang)，成品從下部(bu)卸出；靠(kao)近(jin)時，使裝在兩(liang)塊顎(e)板(ban)(ban)(ban)之(zhi)間(jian)的(de)(de)(de)物料受到擠壓，彎折(zhe)和(he)劈(pi)裂(lie)作(zuo)用而破(po)(po)碎(sui)。

動(dong)(dong)(dong)顎懸(xuan)掛(gua)在心(xin)軸(zhou)上(shang)(shang)，可作(zuo)左(zuo)右擺動(dong)(dong)(dong)。偏心(xin)軸(zhou)旋轉時，連(lian)桿做上(shang)(shang)下往復(fu)運(yun)(yun)動(dong)(dong)(dong)，帶動(dong)(dong)(dong)兩(liang)塊推力板也做往復(fu)運(yun)(yun)動(dong)(dong)(dong)，從而(er)推動(dong)(dong)(dong)動(dong)(dong)(dong)顎做左(zuo)右往復(fu)運(yun)(yun)動(dong)(dong)(dong)，實(shi)現破(po)(po)(po)碎(sui)和卸料。此種破(po)(po)(po)碎(sui)機(ji)(ji)采用曲柄雙連(lian)桿機(ji)(ji)構，雖然(ran)動(dong)(dong)(dong)顎上(shang)(shang)受(shou)(shou)有很大(da)的(de)(de)破(po)(po)(po)碎(sui)反(fan)力，而(er)其偏心(xin)軸(zhou)和連(lian)桿卻受(shou)(shou)力不大(da)，所以工業上(shang)(shang)多(duo)制成(cheng)大(da)型(xing)機(ji)(ji)和中型(xing)機(ji)(ji)，用來破(po)(po)(po)碎(sui)堅硬(ying)的(de)(de)物料。此外，這種破(po)(po)(po)碎(sui)機(ji)(ji)工作(zuo)時，動(dong)(dong)(dong)顎上(shang)(shang)每點的(de)(de)運(yun)(yun)動(dong)(dong)(dong)軌跡(ji)都是以心(xin)軸(zhou)的(de)(de)圓弧(hu)，圓弧(hu)半徑等于(yu)(yu)該(gai)點至(zhi)軸(zhou)心(xin)的(de)(de)距離(li)，上(shang)(shang)端圓弧(hu)小，下端圓弧(hu)大(da)，破(po)(po)(po)碎(sui)效(xiao)率較(jiao)低，其破(po)(po)(po)碎(sui)比一般(ban)為3-6。由于(yu)(yu)運(yun)(yun)動(dong)(dong)(dong)軌跡(ji)簡單，故稱簡單擺動(dong)(dong)(dong)顎式破(po)(po)(po)碎(sui)機(ji)(ji)。

動(dong)(dong)(dong)顎(e)(e)懸掛在心(xin)軸上(shang)，可作左右擺動(dong)(dong)(dong)。偏心(xin)軸旋轉時(shi)(shi)，連桿(gan)做上(shang)下往復運(yun)(yun)動(dong)(dong)(dong)，帶(dai)動(dong)(dong)(dong)兩塊推(tui)力板也(ye)做往復運(yun)(yun)動(dong)(dong)(dong)，從而推(tui)動(dong)(dong)(dong)動(dong)(dong)(dong)顎(e)(e)做左右往復運(yun)(yun)動(dong)(dong)(dong)，實現(xian)破(po)碎(sui)(sui)(sui)和(he)卸料(liao)。此(ci)種破(po)碎(sui)(sui)(sui)機(ji)采用(yong)曲柄雙連桿(gan)機(ji)構(gou)，雖然動(dong)(dong)(dong)顎(e)(e)上(shang)受有很(hen)大的破(po)碎(sui)(sui)(sui)反(fan)力，而其偏心(xin)軸和(he)連桿(gan)卻受力不大，所以(yi)工(gong)業上(shang)多(duo)制(zhi)成大型機(ji)和(he)中型機(ji)，用(yong)來破(po)碎(sui)(sui)(sui)堅(jian)硬的物料(liao)。此(ci)外，這(zhe)種破(po)碎(sui)(sui)(sui)機(ji)工(gong)作時(shi)(shi)，動(dong)(dong)(dong)顎(e)(e)上(shang)每點的運(yun)(yun)動(dong)(dong)(dong)軌跡(ji)都是(shi)以(yi)心(xin)軸的圓(yuan)(yuan)弧，圓(yuan)(yuan)弧半(ban)徑(jing)等于(yu)該點至(zhi)軸心(xin)的距(ju)離，上(shang)端(duan)圓(yuan)(yuan)弧小，下端(duan)圓(yuan)(yuan)弧大，破(po)碎(sui)(sui)(sui)效率(lv)較(jiao)低，其破(po)碎(sui)(sui)(sui)比(bi)一般為(wei)3-6。由于(yu)運(yun)(yun)動(dong)(dong)(dong)軌跡(ji)簡單，故(gu)稱簡單擺動(dong)(dong)(dong)顎(e)(e)式破(po)碎(sui)(sui)(sui)機(ji)。