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混凝土泵

液(ye)壓(ya)系統的(de)發(fa)(fa)熱(re)按發(fa)(fa)熱(re)原(yuan)(yuan)因可分為兩大類(lei)：一(yi)類(lei)是由于設計的(de)原(yuan)(yuan)因造成(cheng)的(de)發(fa)(fa)熱(re)；一(yi)類(lei)是由于液(ye)壓(ya)元件故(gu)障(zhang)或使(shi)用不當的(de)原(yuan)(yuan)因，造成(cheng)的(de)發(fa)(fa)熱(re)。顯然，發(fa)(fa)熱(re)原(yuan)(yuan)因不同，其排除(chu)方法也不一(yi)樣。

1設計不合(he)理，造成液壓系統(tong)的發熱(re)及其排除(chu)

（1）液(ye)壓油(you)(you)(you)(you)(you)的(de)油(you)(you)(you)(you)(you)號選(xuan)用不當(dang)，可(ke)能造成液(ye)壓系(xi)統(tong)的(de)發熱所選(xuan)液(ye)壓油(you)(you)(you)(you)(you)在油(you)(you)(you)(you)(you)溫較(jiao)低(di)時，系(xi)統(tong)正(zheng)常工(gong)(gong)作(zuo)，但系(xi)統(tong)工(gong)(gong)作(zuo)一段時間(jian)后(hou)，油(you)(you)(you)(you)(you)溫升高，液(ye)壓油(you)(you)(you)(you)(you)黏度(du)下降，造成系(xi)統(tong)內(nei)部(bu)泄(xie)漏增加，伴(ban)隨泄(xie)漏的(de)增加更促(cu)使(shi)了油(you)(you)(you)(you)(you)溫的(de)上升，形(xing)成油(you)(you)(you)(you)(you)溫的(de)惡(e)性循環。解決的(de)方(fang)法是：根據系(xi)統(tong)的(de)負(fu)載及(ji)正(zheng)常工(gong)(gong)作(zuo)溫度(du)要求，選(xuan)擇合(he)適黏度(du)的(de)液(ye)壓油(you)(you)(you)(you)(you)。

（2）油(you)(you)(you)(you)箱(xiang)設(she)(she)計(ji)不(bu)合理，使(shi)(shi)液(ye)壓(ya)系統散(san)熱(re)效果降低系統發熱(re)油(you)(you)(you)(you)箱(xiang)的主要功能是儲(chu)存液(ye)壓(ya)油(you)(you)(you)(you)，但它同時兼(jian)有散(san)熱(re)、沉淀雜質、分(fen)離(li)水分(fen)的作用(yong)。油(you)(you)(you)(you)箱(xiang)設(she)(she)計(ji)不(bu)合理，主要表(biao)現在兩個方面：一(yi)是油(you)(you)(you)(you)箱(xiang)體積(ji)(ji)(ji)設(she)(she)計(ji)過小(xiao)，由于(yu)混凝土泵屬移動型液(ye)壓(ya)設(she)(she)備，油(you)(you)(you)(you)箱(xiang)體積(ji)(ji)(ji)一(yi)般為液(ye)壓(ya)泵流量(liang)的一(yi)倍左右，因(yin)此，油(you)(you)(you)(you)箱(xiang)散(san)熱(re)面積(ji)(ji)(ji)及儲(chu)油(you)(you)(you)(you)量(liang)均較小(xiao)；二是有些(xie)油(you)(you)(you)(you)箱(xiang)在結構上設(she)(she)計(ji)不(bu)合理，吸(xi)油(you)(you)(you)(you)管(guan)口(kou)和回(hui)(hui)油(you)(you)(you)(you)管(guan)口(kou)較近，中間(jian)又不(bu)設(she)(she)隔(ge)(ge)板，從而縮短了油(you)(you)(you)(you)液(ye)在油(you)(you)(you)(you)箱(xiang)內的冷卻循環(huan)及沉淀雜質的路(lu)徑(jing)，甚至造成大部(bu)分(fen)回(hui)(hui)油(you)(you)(you)(you)直接進入吸(xi)油(you)(you)(you)(you)管(guan)，使(shi)(shi)油(you)(you)(you)(you)箱(xiang)的散(san)熱(re)效果降低，油(you)(you)(you)(you)溫升高(gao)。解決方法是：適當(dang)增加油(you)(you)(you)(you)箱(xiang)體積(ji)(ji)(ji)，使(shi)(shi)油(you)(you)(you)(you)箱(xiang)體積(ji)(ji)(ji)為（1125~115）Q，并盡量(liang)加大吸(xi)油(you)(you)(you)(you)管(guan)口(kou)與回(hui)(hui)油(you)(you)(you)(you)管(guan)口(kou)之間(jian)的距離(li)，吸(xi)、回(hui)(hui)油(you)(you)(you)(you)管(guan)之間(jian)應(ying)設(she)(she)置隔(ge)(ge)板，以確保油(you)(you)(you)(you)箱(xiang)應(ying)有的散(san)熱(re)功率。

（3）散(san)熱流(liu)(liu)量較小(xiao)(xiao)，冷(leng)卻(que)(que)(que)器(qi)(qi)(qi)安裝位置(zhi)不合理(li)，使系(xi)(xi)統(tong)散(san)熱能力(li)降(jiang)低混(hun)凝(ning)土泵的(de)(de)(de)(de)冷(leng)卻(que)(que)(que)方式(shi)有風冷(leng)和水冷(leng)兩種(zhong)，用(yong)戶可(ke)根據實際情況選用(yong)，但(dan)一般(ban)采(cai)用(yong)風冷(leng)較多。有些混(hun)凝(ning)土泵因(yin)考慮冷(leng)卻(que)(que)(que)器(qi)(qi)(qi)的(de)(de)(de)(de)承(cheng)(cheng)壓(ya)要求，將冷(leng)卻(que)(que)(que)器(qi)(qi)(qi)設(she)(she)置(zhi)在(zai)攪拌系(xi)(xi)統(tong)的(de)(de)(de)(de)回(hui)油路(lu)(lu)上，僅對攪拌系(xi)(xi)統(tong)的(de)(de)(de)(de)油液進行冷(leng)卻(que)(que)(que)，因(yin)攪拌系(xi)(xi)統(tong)流(liu)(liu)量較小(xiao)(xiao)，因(yin)此整個(ge)(ge)系(xi)(xi)統(tong)冷(leng)卻(que)(que)(que)效(xiao)果(guo)差，使系(xi)(xi)統(tong)發(fa)熱。解決(jue)的(de)(de)(de)(de)方法：一是可(ke)采(cai)用(yong)獨(du)立(li)冷(leng)卻(que)(que)(que)回(hui)路(lu)(lu)，提(ti)高(gao)冷(leng)卻(que)(que)(que)效(xiao)果(guo)。二(er)是將冷(leng)卻(que)(que)(que)器(qi)(qi)(qi)設(she)(she)置(zhi)在(zai)系(xi)(xi)統(tong)總回(hui)油路(lu)(lu)上，以加大散(san)熱流(liu)(liu)量，提(ti)高(gao)冷(leng)卻(que)(que)(que)效(xiao)果(guo)，但(dan)此時(shi)應注意兩個(ge)(ge)問題(ti)(ti)，個(ge)(ge)問題(ti)(ti)是冷(leng)卻(que)(que)(que)風扇(shan)(shan)的(de)(de)(de)(de)轉速(su)，冷(leng)卻(que)(que)(que)風扇(shan)(shan)的(de)(de)(de)(de)轉速(su)不能過(guo)低，否(fou)則將降(jiang)低冷(leng)卻(que)(que)(que)效(xiao)果(guo)，可(ke)采(cai)用(yong)電動機驅(qu)動風扇(shan)(shan)，或(huo)在(zai)總回(hui)油路(lu)(lu)上設(she)(she)置(zhi)一低壓(ya)驅(qu)動馬達(da)，使馬達(da)轉速(su)與(yu)散(san)熱流(liu)(liu)量相匹配，同時(shi)還可(ke)解決(jue)主回(hui)路(lu)(lu)壓(ya)力(li)沖(chong)擊對冷(leng)卻(que)(que)(que)器(qi)(qi)(qi)承(cheng)(cheng)壓(ya)能力(li)的(de)(de)(de)(de)影(ying)響(xiang)；第(di)二(er)個(ge)(ge)問題(ti)(ti)是如(ru)采(cai)用(yong)電動機驅(qu)動風扇(shan)(shan)，主系(xi)(xi)統(tong)的(de)(de)(de)(de)壓(ya)力(li)沖(chong)擊對冷(leng)卻(que)(que)(que)器(qi)(qi)(qi)承(cheng)(cheng)壓(ya)能力(li)的(de)(de)(de)(de)影(ying)響(xiang)，此時(shi)，可(ke)在(zai)回(hui)油路(lu)(lu)上與(yu)冷(leng)卻(que)(que)(que)器(qi)(qi)(qi)并裝一個(ge)(ge)低壓(ya)溢(yi)流(liu)(liu)保護閥或(huo)單向閥對冷(leng)卻(que)(que)(que)器(qi)(qi)(qi)進行高(gao)承(cheng)(cheng)壓(ya)保護。

（4）液(ye)(ye)(ye)(ye)壓(ya)(ya)(ya)元(yuan)(yuan)(yuan)件(jian)選(xuan)(xuan)型不當，造成系(xi)(xi)(xi)統(tong)(tong)(tong)發熱混凝土(tu)泵液(ye)(ye)(ye)(ye)壓(ya)(ya)(ya)系(xi)(xi)(xi)統(tong)(tong)(tong)一般為(wei)高壓(ya)(ya)(ya)大(da)流量系(xi)(xi)(xi)統(tong)(tong)(tong)，如果系(xi)(xi)(xi)統(tong)(tong)(tong)中的(de)(de)液(ye)(ye)(ye)(ye)壓(ya)(ya)(ya)元(yuan)(yuan)(yuan)件(jian)，主要(yao)(yao)是換向閥(fa)、溢流閥(fa)和順(shun)序閥(fa)規(gui)格選(xuan)(xuan)用不合(he)理，不能(neng)滿(man)足大(da)流量要(yao)(yao)求(qiu)，從而(er)在(zai)使用中，使閥(fa)口(kou)液(ye)(ye)(ye)(ye)流流速過高，造成較大(da)的(de)(de)壓(ya)(ya)(ya)力損失(shi)而(er)使油溫升高，因此(ci)，液(ye)(ye)(ye)(ye)壓(ya)(ya)(ya)系(xi)(xi)(xi)統(tong)(tong)(tong)設計中在(zai)進(jin)行液(ye)(ye)(ye)(ye)壓(ya)(ya)(ya)元(yuan)(yuan)(yuan)件(jian)選(xuan)(xuan)型設計時，一定要(yao)(yao)根(gen)據液(ye)(ye)(ye)(ye)壓(ya)(ya)(ya)元(yuan)(yuan)(yuan)件(jian)所承受的(de)(de)高工作壓(ya)(ya)(ya)力、所通過的(de)(de)大(da)流量以(yi)及所要(yao)(yao)求(qiu)的(de)(de)壓(ya)(ya)(ya)力和流量調(diao)整范圍進(jin)行元(yuan)(yuan)(yuan)件(jian)的(de)(de)選(xuan)(xuan)擇，盡量減少閥(fa)口(kou)壓(ya)(ya)(ya)力損失(shi)，從而(er)減少由于液(ye)(ye)(ye)(ye)壓(ya)(ya)(ya)元(yuan)(yuan)(yuan)件(jian)規(gui)格選(xuan)(xuan)用不合(he)理而(er)造成的(de)(de)系(xi)(xi)(xi)統(tong)(tong)(tong)發熱。

（5）管(guan)(guan)路設(she)計(ji)(ji)(ji)、安裝不(bu)合理，造(zao)成(cheng)(cheng)壓力(li)損耗大，使壓力(li)能轉(zhuan)換成(cheng)(cheng)熱(re)能在液壓系統(tong)設(she)計(ji)(ji)(ji)中，管(guan)(guan)路的(de)設(she)計(ji)(ji)(ji)與安裝不(bu)能忽視，各管(guan)(guan)路管(guan)(guan)徑(jing)應嚴格按其工作壓力(li)和(he)通過(guo)流量進(jin)行(xing)設(she)計(ji)(ji)(ji)，避免管(guan)(guan)徑(jing)設(she)計(ji)(ji)(ji)過(guo)小(xiao)，造(zao)成(cheng)(cheng)流速過(guo)高，沿程壓力(li)損失過(guo)大，引起發(fa)(fa)熱(re)。同時，還應注意(yi)管(guan)(guan)路的(de)安裝，既要做到外觀整齊，又要避免管(guan)(guan)路集聚及管(guan)(guan)路的(de)急轉(zhuan)彎(wan)，影響管(guan)(guan)路的(de)自然散熱(re)或造(zao)成(cheng)(cheng)局(ju)部壓力(li)損失過(guo)大引起發(fa)(fa)熱(re)。

2因液壓系統(tong)使用不當或元(yuan)件故障，造成(cheng)液壓系統(tong)的發(fa)熱及其(qi)排除

（1）油(you)(you)(you)(you)(you)箱內(nei)(nei)液壓(ya)油(you)(you)(you)(you)(you)油(you)(you)(you)(you)(you)面低(di)于低(di)液面，使油(you)(you)(you)(you)(you)箱散熱(re)功率降(jiang)低(di)混凝土泵在使用過(guo)程中，要(yao)隨時觀察油(you)(you)(you)(you)(you)箱內(nei)(nei)液壓(ya)油(you)(you)(you)(you)(you)的油(you)(you)(you)(you)(you)面高度，始終(zhong)保持液壓(ya)油(you)(you)(you)(you)(you)油(you)(you)(you)(you)(you)面高度在正常油(you)(you)(you)(you)(you)位(wei)范圍內(nei)(nei)，從而(er)保證油(you)(you)(you)(you)(you)箱的散熱(re)效果(guo)，當油(you)(you)(you)(you)(you)箱內(nei)(nei)液壓(ya)油(you)(you)(you)(you)(you)油(you)(you)(you)(you)(you)面低(di)于低(di)液面時，要(yao)及時向(xiang)油(you)(you)(you)(you)(you)箱內(nei)(nei)注油(you)(you)(you)(you)(you)。

（2）冷(leng)(leng)卻(que)(que)(que)器冷(leng)(leng)卻(que)(que)(que)效(xiao)果降低(di)(di)，使(shi)油液溫升，系統發熱冷(leng)(leng)卻(que)(que)(que)器冷(leng)(leng)卻(que)(que)(que)效(xiao)果降低(di)(di)，可能由以下原因(yin)引起：a1冷(leng)(leng)卻(que)(que)(que)器內部(bu)堵(du)塞(sai)或(huo)表(biao)面污物(wu)較(jiao)多(duo)，造成冷(leng)(leng)卻(que)(que)(que)器安全裝置(zhi)開啟，冷(leng)(leng)卻(que)(que)(que)器過流量(liang)降低(di)(di)，使(shi)散熱流量(liang)減(jian)少，或(huo)冷(leng)(leng)卻(que)(que)(que)器通風不良(liang)，使(shi)冷(leng)(leng)卻(que)(que)(que)器的冷(leng)(leng)卻(que)(que)(que)傳(chuan)熱系數降低(di)(di)，冷(leng)(leng)卻(que)(que)(que)效(xiao)果降低(di)(di)，因(yin)此(ci)，混凝(ning)土(tu)泵在(zai)使(shi)用中(zhong)一定(ding)要定(ding)期(qi)檢(jian)查，疏通冷(leng)(leng)卻(que)(que)(que)器，定(ding)期(qi)對冷(leng)(leng)卻(que)(que)(que)器表(biao)面污物(wu)進行清除(chu)，保證(zheng)冷(leng)(leng)卻(que)(que)(que)器的內部(bu)暢通和外部(bu)清潔，以保證(zheng)冷(leng)(leng)卻(que)(que)(que)器的冷(leng)(leng)

卻效果。

冷(leng)卻(que)器(qi)(qi)安(an)全閥或(huo)單向(xiang)閥的開(kai)啟(qi)壓力低于標準值(zhi)，使(shi)冷(leng)卻(que)器(qi)(qi)安(an)全保護(hu)裝(zhuang)置(zhi)(zhi)在冷(leng)卻(que)器(qi)(qi)未(wei)堵塞(sai)時開(kai)啟(qi)，產生(sheng)溢流分流，使(shi)冷(leng)卻(que)器(qi)(qi)散熱(re)流量減少，因此，冷(leng)卻(que)器(qi)(qi)在使(shi)用(yong)前，一(yi)定要正確調(diao)整安(an)全保護(hu)裝(zhuang)置(zhi)(zhi)的開(kai)啟(qi)壓力，在使(shi)用(yong)中(zhong)要定期檢查(cha)、校(xiao)正安(an)全保護(hu)裝(zhuang)置(zhi)(zhi)的開(kai)啟(qi)壓力值(zhi)。

（3）液(ye)壓(ya)(ya)(ya)(ya)系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)(tong)(tong)壓(ya)(ya)(ya)(ya)力(li)(li)調(diao)(diao)整(zheng)不(bu)當，造(zao)成(cheng)(cheng)系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)(tong)(tong)發(fa)熱(re)(re)在混凝土泵(beng)液(ye)壓(ya)(ya)(ya)(ya)系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)(tong)(tong)中，由(you)于(yu)性能要求(qiu)，系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)(tong)(tong)中往往設(she)有安全閥(fa)(fa)(fa)、溢(yi)(yi)流(liu)閥(fa)(fa)(fa)和(he)(he)順(shun)序(xu)(xu)閥(fa)(fa)(fa)等。若(ruo)安全閥(fa)(fa)(fa)的(de)(de)(de)(de)(de)(de)(de)壓(ya)(ya)(ya)(ya)力(li)(li)調(diao)(diao)的(de)(de)(de)(de)(de)(de)(de)過(guo)(guo)低(di)，安全閥(fa)(fa)(fa)將(jiang)頻繁開啟，產生溢(yi)(yi)流(liu)損(sun)失(shi)，造(zao)成(cheng)(cheng)系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)(tong)(tong)發(fa)熱(re)(re)；若(ruo)壓(ya)(ya)(ya)(ya)力(li)(li)調(diao)(diao)整(zheng)過(guo)(guo)高(gao)，又會使系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)(tong)(tong)內(nei)泄漏增加，使系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)(tong)(tong)發(fa)熱(re)(re)，因此(ci)，應按液(ye)壓(ya)(ya)(ya)(ya)系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)(tong)(tong)的(de)(de)(de)(de)(de)(de)(de)負載要求(qiu)，正(zheng)確(que)計算和(he)(he)調(diao)(diao)整(zheng)安全閥(fa)(fa)(fa)和(he)(he)壓(ya)(ya)(ya)(ya)力(li)(li)值，從而(er)(er)保證(zheng)系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)(tong)(tong)在規定的(de)(de)(de)(de)(de)(de)(de)壓(ya)(ya)(ya)(ya)力(li)(li)范圍內(nei)工(gong)(gong)(gong)作(zuo)(zuo)(zuo)(zuo)。當混凝土泵(beng)泵(beng)送(song)系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)(tong)(tong)主(zhu)回(hui)路為閉式(shi)(shi)系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)(tong)(tong)時(shi)，泵(beng)送(song)系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)(tong)(tong)中必須設(she)熱(re)(re)交換回(hui)路，熱(re)(re)交換回(hui)路中溢(yi)(yi)流(liu)閥(fa)(fa)(fa)的(de)(de)(de)(de)(de)(de)(de)設(she)定壓(ya)(ya)(ya)(ya)力(li)(li)應引起(qi)重視，設(she)定壓(ya)(ya)(ya)(ya)力(li)(li)過(guo)(guo)低(di)，會使泵(beng)送(song)液(ye)壓(ya)(ya)(ya)(ya)缸(gang)換向沖擊增加，設(she)定壓(ya)(ya)(ya)(ya)力(li)(li)過(guo)(guo)高(gao)，會使溢(yi)(yi)流(liu)損(sun)失(shi)過(guo)(guo)大(da)，系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)(tong)(tong)溫升過(guo)(guo)高(gao)。因此(ci)，應合理(li)確(que)定熱(re)(re)交換回(hui)路溢(yi)(yi)流(liu)閥(fa)(fa)(fa)的(de)(de)(de)(de)(de)(de)(de)調(diao)(diao)整(zheng)壓(ya)(ya)(ya)(ya)力(li)(li)值，一般該(gai)溢(yi)(yi)流(liu)閥(fa)(fa)(fa)的(de)(de)(de)(de)(de)(de)(de)調(diao)(diao)整(zheng)值為（1~115）MPa，泵(beng)送(song)系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)(tong)(tong)補油回(hui)路的(de)(de)(de)(de)(de)(de)(de)工(gong)(gong)(gong)作(zuo)(zuo)(zuo)(zuo)壓(ya)(ya)(ya)(ya)力(li)(li)為215MPa。當混凝土泵(beng)液(ye)壓(ya)(ya)(ya)(ya)系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)(tong)(tong)中設(she)置順(shun)序(xu)(xu)閥(fa)(fa)(fa)時(shi)，一定要了(le)解順(shun)序(xu)(xu)閥(fa)(fa)(fa)的(de)(de)(de)(de)(de)(de)(de)工(gong)(gong)(gong)作(zuo)(zuo)(zuo)(zuo)特點，正(zheng)確(que)調(diao)(diao)整(zheng)順(shun)序(xu)(xu)閥(fa)(fa)(fa)的(de)(de)(de)(de)(de)(de)(de)工(gong)(gong)(gong)作(zuo)(zuo)(zuo)(zuo)壓(ya)(ya)(ya)(ya)力(li)(li)。如(ru)果內(nei)控式(shi)(shi)順(shun)序(xu)(xu)閥(fa)(fa)(fa)的(de)(de)(de)(de)(de)(de)(de)調(diao)(diao)整(zheng)壓(ya)(ya)(ya)(ya)力(li)(li)過(guo)(guo)高(gao)，當工(gong)(gong)(gong)作(zuo)(zuo)(zuo)(zuo)液(ye)壓(ya)(ya)(ya)(ya)缸(gang)的(de)(de)(de)(de)(de)(de)(de)工(gong)(gong)(gong)作(zuo)(zuo)(zuo)(zuo)壓(ya)(ya)(ya)(ya)力(li)(li)低(di)于(yu)其調(diao)(diao)整(zheng)壓(ya)(ya)(ya)(ya)力(li)(li)時(shi)，順(shun)序(xu)(xu)閥(fa)(fa)(fa)閥(fa)(fa)(fa)口存在壓(ya)(ya)(ya)(ya)力(li)(li)損(sun)失(shi)，引起(qi)溫升，造(zao)成(cheng)(cheng)系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)(tong)(tong)發(fa)熱(re)(re)，合理(li)確(que)定內(nei)控式(shi)(shi)順(shun)序(xu)(xu)閥(fa)(fa)(fa)的(de)(de)(de)(de)(de)(de)(de)設(she)定壓(ya)(ya)(ya)(ya)力(li)(li)，可(ke)使工(gong)(gong)(gong)作(zuo)(zuo)(zuo)(zuo)缸(gang)的(de)(de)(de)(de)(de)(de)(de)工(gong)(gong)(gong)作(zuo)(zuo)(zuo)(zuo)壓(ya)(ya)(ya)(ya)力(li)(li)高(gao)于(yu)順(shun)序(xu)(xu)閥(fa)(fa)(fa)的(de)(de)(de)(de)(de)(de)(de)開啟壓(ya)(ya)(ya)(ya)力(li)(li)，順(shun)序(xu)(xu)閥(fa)(fa)(fa)工(gong)(gong)(gong)作(zuo)(zuo)(zuo)(zuo)時(shi)，閥(fa)(fa)(fa)口將(jiang)全開，閥(fa)(fa)(fa)口基本無壓(ya)(ya)(ya)(ya)力(li)(li)損(sun)失(shi)，從而(er)(er)避免(mian)了(le)由(you)于(yu)順(shun)序(xu)(xu)閥(fa)(fa)(fa)設(she)定壓(ya)(ya)(ya)(ya)力(li)(li)不(bu)當而(er)(er)造(zao)成(cheng)(cheng)的(de)(de)(de)(de)(de)(de)(de)系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)(tong)(tong)發(fa)熱(re)(re)。

（4）內(nei)泄增加(jia)(jia)，可使(shi)油(you)(you)溫(wen)升高，系統發熱混凝土(tu)泵液(ye)壓(ya)(ya)(ya)系統的(de)內(nei)泄，包括液(ye)壓(ya)(ya)(ya)泵、液(ye)壓(ya)(ya)(ya)缸、液(ye)壓(ya)(ya)(ya)馬達(da)和液(ye)壓(ya)(ya)(ya)閥的(de)內(nei)泄，壓(ya)(ya)(ya)力(li)油(you)(you)在泄漏(lou)過(guo)程中，壓(ya)(ya)(ya)力(li)下(xia)降，溫(wen)度升高。如果系統的(de)內(nei)泄增加(jia)(jia)，會(hui)引起(qi)油(you)(you)溫(wen)升高，系統過(guo)熱，嚴重時，會(hui)使(shi)系統壓(ya)(ya)(ya)力(li)下(xia)降，泵送(song)無(wu)力(li)，泵送(song)排量降低(di)，攪拌無(wu)力(li)，攪拌轉(zhuan)速下(xia)降等。因此，要定期檢查這些元(yuan)件(jian)，定期更換相(xiang)應(ying)(ying)的(de)密封元(yuan)件(jian)，及時對已(yi)損壞(huai)、拉傷的(de)零件(jian)進行更換或修理，甚(shen)至更換相(xiang)應(ying)(ying)的(de)液(ye)壓(ya)(ya)(ya)元(yuan)件(jian)，從(cong)而(er)避免由(you)于元(yuan)件(jian)泄漏(lou)而(er)造成的(de)系統發熱。

混凝土泵

液壓系統在使用過程中的發熱問題已成為不可忽視的問題之一，由于液壓系統的發熱，將導致混凝土泵許多故障的發生。對于混凝土泵生產廠家，應力求從設計入手，把其液壓系統的發熱降低至低值，這樣不僅可提高用戶混凝土泵的開機率和延長其使用壽命，而且可節能和降低維護費用；對于混凝土泵用戶，應力求從使用維護入手，嚴格按生產廠家的要求，正確使用、調試、檢查、維護混凝土泵，以減少故障率和減少因使用不當而引起的系統發熱。總之，對發熱產生的不同原因，采取一定措施后，可以控制或減輕液壓系統的發熱，提高

混凝土泵

的開機率和延長使用(yong)壽(shou)命(ming)。