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混凝土泵

液壓系統的發熱(re)(re)按發熱(re)(re)原(yuan)因可分為兩大類(lei)：一類(lei)是由(you)于設計的原(yuan)因造成(cheng)的發熱(re)(re)；一類(lei)是由(you)于液壓元件故障或使(shi)用不(bu)當的原(yuan)因，造成(cheng)的發熱(re)(re)。顯然，發熱(re)(re)原(yuan)因不(bu)同(tong)，其排除方法也不(bu)一樣。

1設計(ji)不(bu)合理，造成液(ye)壓系統(tong)的發熱及其排除(chu)

（1）液(ye)壓(ya)油(you)(you)的(de)(de)(de)油(you)(you)號選用不(bu)當，可能造成液(ye)壓(ya)系統(tong)(tong)的(de)(de)(de)發熱所(suo)選液(ye)壓(ya)油(you)(you)在油(you)(you)溫(wen)較低(di)時，系統(tong)(tong)正常(chang)(chang)工(gong)作，但系統(tong)(tong)工(gong)作一段時間(jian)后，油(you)(you)溫(wen)升高(gao)，液(ye)壓(ya)油(you)(you)黏度下降(jiang)，造成系統(tong)(tong)內部泄(xie)漏增加，伴隨泄(xie)漏的(de)(de)(de)增加更促(cu)使了油(you)(you)溫(wen)的(de)(de)(de)上(shang)升，形成油(you)(you)溫(wen)的(de)(de)(de)惡性循環。解決的(de)(de)(de)方法是：根據系統(tong)(tong)的(de)(de)(de)負(fu)載(zai)及正常(chang)(chang)工(gong)作溫(wen)度要(yao)求(qiu)，選擇合適黏度的(de)(de)(de)液(ye)壓(ya)油(you)(you)。

（2）油(you)(you)(you)(you)(you)(you)(you)(you)(you)箱(xiang)(xiang)(xiang)設(she)(she)計不(bu)合理(li)，使(shi)液壓系(xi)統散(san)(san)熱(re)效(xiao)果(guo)降(jiang)(jiang)低(di)系(xi)統發熱(re)油(you)(you)(you)(you)(you)(you)(you)(you)(you)箱(xiang)(xiang)(xiang)的(de)(de)主要功(gong)能(neng)是儲存液壓油(you)(you)(you)(you)(you)(you)(you)(you)(you)，但它同時兼有(you)散(san)(san)熱(re)、沉(chen)淀雜(za)質(zhi)、分(fen)離水分(fen)的(de)(de)作用。油(you)(you)(you)(you)(you)(you)(you)(you)(you)箱(xiang)(xiang)(xiang)設(she)(she)計不(bu)合理(li)，主要表現在兩個方面(mian)：一(yi)是油(you)(you)(you)(you)(you)(you)(you)(you)(you)箱(xiang)(xiang)(xiang)體積(ji)(ji)設(she)(she)計過小，由于(yu)混凝土泵屬移動型液壓設(she)(she)備，油(you)(you)(you)(you)(you)(you)(you)(you)(you)箱(xiang)(xiang)(xiang)體積(ji)(ji)一(yi)般為液壓泵流量的(de)(de)一(yi)倍左右(you)，因此，油(you)(you)(you)(you)(you)(you)(you)(you)(you)箱(xiang)(xiang)(xiang)散(san)(san)熱(re)面(mian)積(ji)(ji)及儲油(you)(you)(you)(you)(you)(you)(you)(you)(you)量均(jun)較小；二(er)是有(you)些油(you)(you)(you)(you)(you)(you)(you)(you)(you)箱(xiang)(xiang)(xiang)在結構上(shang)設(she)(she)計不(bu)合理(li)，吸油(you)(you)(you)(you)(you)(you)(you)(you)(you)管(guan)口(kou)和(he)回油(you)(you)(you)(you)(you)(you)(you)(you)(you)管(guan)口(kou)較近(jin)，中間又不(bu)設(she)(she)隔板(ban)，從而(er)縮短了油(you)(you)(you)(you)(you)(you)(you)(you)(you)液在油(you)(you)(you)(you)(you)(you)(you)(you)(you)箱(xiang)(xiang)(xiang)內的(de)(de)冷(leng)卻循環及沉(chen)淀雜(za)質(zhi)的(de)(de)路徑，甚至(zhi)造成大部分(fen)回油(you)(you)(you)(you)(you)(you)(you)(you)(you)直接(jie)進入吸油(you)(you)(you)(you)(you)(you)(you)(you)(you)管(guan)，使(shi)油(you)(you)(you)(you)(you)(you)(you)(you)(you)箱(xiang)(xiang)(xiang)的(de)(de)散(san)(san)熱(re)效(xiao)果(guo)降(jiang)(jiang)低(di)，油(you)(you)(you)(you)(you)(you)(you)(you)(you)溫升高。解(jie)決方法是：適當增加(jia)油(you)(you)(you)(you)(you)(you)(you)(you)(you)箱(xiang)(xiang)(xiang)體積(ji)(ji)，使(shi)油(you)(you)(you)(you)(you)(you)(you)(you)(you)箱(xiang)(xiang)(xiang)體積(ji)(ji)為（1125~115）Q，并盡(jin)量加(jia)大吸油(you)(you)(you)(you)(you)(you)(you)(you)(you)管(guan)口(kou)與回油(you)(you)(you)(you)(you)(you)(you)(you)(you)管(guan)口(kou)之間的(de)(de)距(ju)離，吸、回油(you)(you)(you)(you)(you)(you)(you)(you)(you)管(guan)之間應設(she)(she)置隔板(ban)，以確(que)保油(you)(you)(you)(you)(you)(you)(you)(you)(you)箱(xiang)(xiang)(xiang)應有(you)的(de)(de)散(san)(san)熱(re)功(gong)率。

（3）散熱流量(liang)較小(xiao)(xiao)，冷(leng)(leng)(leng)(leng)卻(que)器(qi)安裝(zhuang)位(wei)置(zhi)不合理(li)，使系(xi)(xi)(xi)統(tong)散熱能(neng)力降低(di)(di)(di)混凝(ning)土(tu)泵的(de)(de)冷(leng)(leng)(leng)(leng)卻(que)方式有(you)風(feng)(feng)(feng)冷(leng)(leng)(leng)(leng)和水(shui)冷(leng)(leng)(leng)(leng)兩種，用(yong)(yong)戶(hu)可(ke)根據實(shi)際情(qing)況(kuang)選用(yong)(yong)，但一般(ban)采(cai)用(yong)(yong)風(feng)(feng)(feng)冷(leng)(leng)(leng)(leng)較多。有(you)些混凝(ning)土(tu)泵因(yin)考慮冷(leng)(leng)(leng)(leng)卻(que)器(qi)的(de)(de)承壓要求，將冷(leng)(leng)(leng)(leng)卻(que)器(qi)設置(zhi)在攪(jiao)拌(ban)系(xi)(xi)(xi)統(tong)的(de)(de)回油(you)(you)路上，僅(jin)對攪(jiao)拌(ban)系(xi)(xi)(xi)統(tong)的(de)(de)油(you)(you)液(ye)進行冷(leng)(leng)(leng)(leng)卻(que)，因(yin)攪(jiao)拌(ban)系(xi)(xi)(xi)統(tong)流量(liang)較小(xiao)(xiao)，因(yin)此整個(ge)系(xi)(xi)(xi)統(tong)冷(leng)(leng)(leng)(leng)卻(que)效果差，使系(xi)(xi)(xi)統(tong)發(fa)熱。解決的(de)(de)方法：一是可(ke)采(cai)用(yong)(yong)獨(du)立冷(leng)(leng)(leng)(leng)卻(que)回路，提高冷(leng)(leng)(leng)(leng)卻(que)效果。二(er)(er)是將冷(leng)(leng)(leng)(leng)卻(que)器(qi)設置(zhi)在系(xi)(xi)(xi)統(tong)總(zong)回油(you)(you)路上，以(yi)加大散熱流量(liang)，提高冷(leng)(leng)(leng)(leng)卻(que)效果，但此時應注意(yi)兩個(ge)問(wen)題，個(ge)問(wen)題是冷(leng)(leng)(leng)(leng)卻(que)風(feng)(feng)(feng)扇的(de)(de)轉(zhuan)速，冷(leng)(leng)(leng)(leng)卻(que)風(feng)(feng)(feng)扇的(de)(de)轉(zhuan)速不能(neng)過(guo)低(di)(di)(di)，否(fou)則(ze)將降低(di)(di)(di)冷(leng)(leng)(leng)(leng)卻(que)效果，可(ke)采(cai)用(yong)(yong)電動機驅動風(feng)(feng)(feng)扇，或在總(zong)回油(you)(you)路上設置(zhi)一低(di)(di)(di)壓驅動馬達(da)，使馬達(da)轉(zhuan)速與散熱流量(liang)相匹配(pei)，同時還可(ke)解決主(zhu)回路壓力沖擊對冷(leng)(leng)(leng)(leng)卻(que)器(qi)承壓能(neng)力的(de)(de)影響；第(di)二(er)(er)個(ge)問(wen)題是如采(cai)用(yong)(yong)電動機驅動風(feng)(feng)(feng)扇，主(zhu)系(xi)(xi)(xi)統(tong)的(de)(de)壓力沖擊對冷(leng)(leng)(leng)(leng)卻(que)器(qi)承壓能(neng)力的(de)(de)影響，此時，可(ke)在回油(you)(you)路上與冷(leng)(leng)(leng)(leng)卻(que)器(qi)并裝(zhuang)一個(ge)低(di)(di)(di)壓溢(yi)流保(bao)護閥(fa)(fa)或單向閥(fa)(fa)對冷(leng)(leng)(leng)(leng)卻(que)器(qi)進行高承壓保(bao)護。

（4）液(ye)(ye)(ye)壓(ya)(ya)(ya)(ya)元(yuan)(yuan)件(jian)選(xuan)型(xing)不(bu)當，造成系(xi)統(tong)(tong)(tong)發(fa)熱混(hun)凝土泵(beng)液(ye)(ye)(ye)壓(ya)(ya)(ya)(ya)系(xi)統(tong)(tong)(tong)一(yi)般為高壓(ya)(ya)(ya)(ya)大流(liu)量(liang)(liang)系(xi)統(tong)(tong)(tong)，如(ru)果系(xi)統(tong)(tong)(tong)中(zhong)(zhong)的(de)液(ye)(ye)(ye)壓(ya)(ya)(ya)(ya)元(yuan)(yuan)件(jian)，主要是換向(xiang)閥(fa)、溢流(liu)閥(fa)和(he)(he)順序(xu)閥(fa)規格選(xuan)用(yong)不(bu)合(he)理(li)，不(bu)能滿足(zu)大流(liu)量(liang)(liang)要求(qiu)，從而(er)在使用(yong)中(zhong)(zhong)，使閥(fa)口液(ye)(ye)(ye)流(liu)流(liu)速過高，造成較大的(de)壓(ya)(ya)(ya)(ya)力損(sun)失(shi)而(er)使油溫升高，因此，液(ye)(ye)(ye)壓(ya)(ya)(ya)(ya)系(xi)統(tong)(tong)(tong)設計中(zhong)(zhong)在進行液(ye)(ye)(ye)壓(ya)(ya)(ya)(ya)元(yuan)(yuan)件(jian)選(xuan)型(xing)設計時，一(yi)定(ding)要根(gen)據液(ye)(ye)(ye)壓(ya)(ya)(ya)(ya)元(yuan)(yuan)件(jian)所承受的(de)高工作(zuo)壓(ya)(ya)(ya)(ya)力、所通(tong)過的(de)大流(liu)量(liang)(liang)以及所要求(qiu)的(de)壓(ya)(ya)(ya)(ya)力和(he)(he)流(liu)量(liang)(liang)調(diao)整范圍進行元(yuan)(yuan)件(jian)的(de)選(xuan)擇，盡量(liang)(liang)減(jian)少閥(fa)口壓(ya)(ya)(ya)(ya)力損(sun)失(shi)，從而(er)減(jian)少由于液(ye)(ye)(ye)壓(ya)(ya)(ya)(ya)元(yuan)(yuan)件(jian)規格選(xuan)用(yong)不(bu)合(he)理(li)而(er)造成的(de)系(xi)統(tong)(tong)(tong)發(fa)熱。

（5）管(guan)(guan)路(lu)(lu)設(she)計、安(an)裝(zhuang)(zhuang)不(bu)合理，造(zao)成(cheng)(cheng)壓(ya)力損耗大，使(shi)壓(ya)力能(neng)轉換成(cheng)(cheng)熱能(neng)在液(ye)壓(ya)系(xi)統設(she)計中，管(guan)(guan)路(lu)(lu)的(de)(de)設(she)計與安(an)裝(zhuang)(zhuang)不(bu)能(neng)忽視，各管(guan)(guan)路(lu)(lu)管(guan)(guan)徑(jing)應(ying)嚴格按其(qi)工作壓(ya)力和通過(guo)流(liu)量進行設(she)計，避(bi)免管(guan)(guan)徑(jing)設(she)計過(guo)小，造(zao)成(cheng)(cheng)流(liu)速過(guo)高，沿程壓(ya)力損失過(guo)大，引起(qi)發熱。同時，還應(ying)注意(yi)管(guan)(guan)路(lu)(lu)的(de)(de)安(an)裝(zhuang)(zhuang)，既要做(zuo)到外觀整齊，又要避(bi)免管(guan)(guan)路(lu)(lu)集聚及管(guan)(guan)路(lu)(lu)的(de)(de)急轉彎，影響(xiang)管(guan)(guan)路(lu)(lu)的(de)(de)自(zi)然散(san)熱或造(zao)成(cheng)(cheng)局部壓(ya)力損失過(guo)大引起(qi)發熱。

2因液壓系(xi)統(tong)使(shi)用不當或元(yuan)件故(gu)障(zhang)，造成液壓系(xi)統(tong)的發熱及其排(pai)除(chu)

（1）油(you)(you)(you)箱(xiang)內(nei)液(ye)壓油(you)(you)(you)油(you)(you)(you)面(mian)低于(yu)低液(ye)面(mian)，使油(you)(you)(you)箱(xiang)散熱功率降低混凝(ning)土泵在使用過程中，要隨時觀(guan)察油(you)(you)(you)箱(xiang)內(nei)液(ye)壓油(you)(you)(you)的(de)(de)油(you)(you)(you)面(mian)高度，始終保(bao)持液(ye)壓油(you)(you)(you)油(you)(you)(you)面(mian)高度在正常油(you)(you)(you)位范圍(wei)內(nei)，從而保(bao)證油(you)(you)(you)箱(xiang)的(de)(de)散熱效果，當油(you)(you)(you)箱(xiang)內(nei)液(ye)壓油(you)(you)(you)油(you)(you)(you)面(mian)低于(yu)低液(ye)面(mian)時，要及時向(xiang)油(you)(you)(you)箱(xiang)內(nei)注油(you)(you)(you)。

（2）冷(leng)(leng)(leng)(leng)卻(que)(que)器(qi)冷(leng)(leng)(leng)(leng)卻(que)(que)效果(guo)降(jiang)低(di)，使油液溫升(sheng)，系統發熱(re)(re)冷(leng)(leng)(leng)(leng)卻(que)(que)器(qi)冷(leng)(leng)(leng)(leng)卻(que)(que)效果(guo)降(jiang)低(di)，可(ke)能由以下(xia)原因引(yin)起：a1冷(leng)(leng)(leng)(leng)卻(que)(que)器(qi)內(nei)部(bu)堵塞(sai)或(huo)(huo)表面污物較(jiao)多，造成冷(leng)(leng)(leng)(leng)卻(que)(que)器(qi)安全裝置開(kai)啟，冷(leng)(leng)(leng)(leng)卻(que)(que)器(qi)過流(liu)量(liang)降(jiang)低(di)，使散熱(re)(re)流(liu)量(liang)減少，或(huo)(huo)冷(leng)(leng)(leng)(leng)卻(que)(que)器(qi)通(tong)(tong)風不(bu)良，使冷(leng)(leng)(leng)(leng)卻(que)(que)器(qi)的(de)冷(leng)(leng)(leng)(leng)卻(que)(que)傳熱(re)(re)系數降(jiang)低(di)，冷(leng)(leng)(leng)(leng)卻(que)(que)效果(guo)降(jiang)低(di)，因此，混凝土泵在(zai)使用中一定(ding)(ding)要(yao)定(ding)(ding)期(qi)檢查，疏通(tong)(tong)冷(leng)(leng)(leng)(leng)卻(que)(que)器(qi)，定(ding)(ding)期(qi)對冷(leng)(leng)(leng)(leng)卻(que)(que)器(qi)表面污物進(jin)行清(qing)除，保證冷(leng)(leng)(leng)(leng)卻(que)(que)器(qi)的(de)內(nei)部(bu)暢通(tong)(tong)和外部(bu)清(qing)潔，以保證冷(leng)(leng)(leng)(leng)卻(que)(que)器(qi)的(de)冷(leng)(leng)(leng)(leng)

卻效果。

冷卻(que)器安全(quan)閥或單向(xiang)閥的開啟(qi)壓(ya)力低于標準值，使(shi)冷卻(que)器安全(quan)保護裝(zhuang)置(zhi)(zhi)在冷卻(que)器未(wei)堵塞時開啟(qi)，產生溢流(liu)(liu)分流(liu)(liu)，使(shi)冷卻(que)器散熱流(liu)(liu)量減少，因此，冷卻(que)器在使(shi)用前，一(yi)定要(yao)正確(que)調整安全(quan)保護裝(zhuang)置(zhi)(zhi)的開啟(qi)壓(ya)力，在使(shi)用中要(yao)定期檢查、校正安全(quan)保護裝(zhuang)置(zhi)(zhi)的開啟(qi)壓(ya)力值。

（3）液壓(ya)(ya)(ya)(ya)(ya)(ya)系(xi)統(tong)(tong)(tong)(tong)壓(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)調整(zheng)不當(dang)，造(zao)成系(xi)統(tong)(tong)(tong)(tong)發熱(re)(re)在混凝(ning)土(tu)泵(beng)液壓(ya)(ya)(ya)(ya)(ya)(ya)系(xi)統(tong)(tong)(tong)(tong)中(zhong)，由于(yu)性能要(yao)求，系(xi)統(tong)(tong)(tong)(tong)中(zhong)往(wang)往(wang)設(she)有(you)安全(quan)(quan)閥(fa)(fa)(fa)、溢(yi)(yi)(yi)流閥(fa)(fa)(fa)和順(shun)(shun)序閥(fa)(fa)(fa)等。若安全(quan)(quan)閥(fa)(fa)(fa)的(de)(de)壓(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)調的(de)(de)過(guo)低，安全(quan)(quan)閥(fa)(fa)(fa)將頻繁開啟(qi)(qi)，產(chan)生溢(yi)(yi)(yi)流損失，造(zao)成系(xi)統(tong)(tong)(tong)(tong)發熱(re)(re)；若壓(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)調整(zheng)過(guo)高(gao)，又(you)會使(shi)(shi)系(xi)統(tong)(tong)(tong)(tong)內泄漏增(zeng)加，使(shi)(shi)系(xi)統(tong)(tong)(tong)(tong)發熱(re)(re)，因此，應(ying)(ying)(ying)按液壓(ya)(ya)(ya)(ya)(ya)(ya)系(xi)統(tong)(tong)(tong)(tong)的(de)(de)負載要(yao)求，正確(que)計算和調整(zheng)安全(quan)(quan)閥(fa)(fa)(fa)和壓(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)值，從而保證(zheng)系(xi)統(tong)(tong)(tong)(tong)在規定(ding)(ding)(ding)(ding)的(de)(de)壓(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)范圍(wei)內工(gong)作(zuo)(zuo)。當(dang)混凝(ning)土(tu)泵(beng)泵(beng)送(song)(song)系(xi)統(tong)(tong)(tong)(tong)主(zhu)回(hui)(hui)(hui)路為(wei)閉式系(xi)統(tong)(tong)(tong)(tong)時，泵(beng)送(song)(song)系(xi)統(tong)(tong)(tong)(tong)中(zhong)必須(xu)設(she)熱(re)(re)交(jiao)換(huan)回(hui)(hui)(hui)路，熱(re)(re)交(jiao)換(huan)回(hui)(hui)(hui)路中(zhong)溢(yi)(yi)(yi)流閥(fa)(fa)(fa)的(de)(de)設(she)定(ding)(ding)(ding)(ding)壓(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)應(ying)(ying)(ying)引(yin)起(qi)重視，設(she)定(ding)(ding)(ding)(ding)壓(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)過(guo)低，會使(shi)(shi)泵(beng)送(song)(song)液壓(ya)(ya)(ya)(ya)(ya)(ya)缸(gang)(gang)換(huan)向沖(chong)擊(ji)增(zeng)加，設(she)定(ding)(ding)(ding)(ding)壓(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)過(guo)高(gao)，會使(shi)(shi)溢(yi)(yi)(yi)流損失過(guo)大，系(xi)統(tong)(tong)(tong)(tong)溫(wen)(wen)升過(guo)高(gao)。因此，應(ying)(ying)(ying)合(he)理確(que)定(ding)(ding)(ding)(ding)熱(re)(re)交(jiao)換(huan)回(hui)(hui)(hui)路溢(yi)(yi)(yi)流閥(fa)(fa)(fa)的(de)(de)調整(zheng)壓(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)值，一般該溢(yi)(yi)(yi)流閥(fa)(fa)(fa)的(de)(de)調整(zheng)值為(wei)（1~115）MPa，泵(beng)送(song)(song)系(xi)統(tong)(tong)(tong)(tong)補油回(hui)(hui)(hui)路的(de)(de)工(gong)作(zuo)(zuo)壓(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)為(wei)215MPa。當(dang)混凝(ning)土(tu)泵(beng)液壓(ya)(ya)(ya)(ya)(ya)(ya)系(xi)統(tong)(tong)(tong)(tong)中(zhong)設(she)置順(shun)(shun)序閥(fa)(fa)(fa)時，一定(ding)(ding)(ding)(ding)要(yao)了解順(shun)(shun)序閥(fa)(fa)(fa)的(de)(de)工(gong)作(zuo)(zuo)特(te)點，正確(que)調整(zheng)順(shun)(shun)序閥(fa)(fa)(fa)的(de)(de)工(gong)作(zuo)(zuo)壓(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)。如(ru)果(guo)內控式順(shun)(shun)序閥(fa)(fa)(fa)的(de)(de)調整(zheng)壓(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)過(guo)高(gao)，當(dang)工(gong)作(zuo)(zuo)液壓(ya)(ya)(ya)(ya)(ya)(ya)缸(gang)(gang)的(de)(de)工(gong)作(zuo)(zuo)壓(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)低于(yu)其(qi)調整(zheng)壓(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)時，順(shun)(shun)序閥(fa)(fa)(fa)閥(fa)(fa)(fa)口(kou)(kou)存在壓(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)損失，引(yin)起(qi)溫(wen)(wen)升，造(zao)成系(xi)統(tong)(tong)(tong)(tong)發熱(re)(re)，合(he)理確(que)定(ding)(ding)(ding)(ding)內控式順(shun)(shun)序閥(fa)(fa)(fa)的(de)(de)設(she)定(ding)(ding)(ding)(ding)壓(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)，可(ke)使(shi)(shi)工(gong)作(zuo)(zuo)缸(gang)(gang)的(de)(de)工(gong)作(zuo)(zuo)壓(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)高(gao)于(yu)順(shun)(shun)序閥(fa)(fa)(fa)的(de)(de)開啟(qi)(qi)壓(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)，順(shun)(shun)序閥(fa)(fa)(fa)工(gong)作(zuo)(zuo)時，閥(fa)(fa)(fa)口(kou)(kou)將全(quan)(quan)開，閥(fa)(fa)(fa)口(kou)(kou)基本無壓(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)損失，從而避(bi)免了由于(yu)順(shun)(shun)序閥(fa)(fa)(fa)設(she)定(ding)(ding)(ding)(ding)壓(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)不當(dang)而造(zao)成的(de)(de)系(xi)統(tong)(tong)(tong)(tong)發熱(re)(re)。

（4）內(nei)(nei)泄(xie)(xie)增加，可使油溫升高(gao)，系(xi)(xi)(xi)(xi)統(tong)發(fa)熱(re)(re)混凝土泵液(ye)壓系(xi)(xi)(xi)(xi)統(tong)的(de)內(nei)(nei)泄(xie)(xie)，包(bao)括液(ye)壓泵、液(ye)壓缸、液(ye)壓馬達(da)和(he)液(ye)壓閥的(de)內(nei)(nei)泄(xie)(xie)，壓力(li)油在泄(xie)(xie)漏過程(cheng)中，壓力(li)下(xia)降，溫度(du)升高(gao)。如果系(xi)(xi)(xi)(xi)統(tong)的(de)內(nei)(nei)泄(xie)(xie)增加，會引起(qi)油溫升高(gao)，系(xi)(xi)(xi)(xi)統(tong)過熱(re)(re)，嚴重時，會使系(xi)(xi)(xi)(xi)統(tong)壓力(li)下(xia)降，泵送無(wu)(wu)力(li)，泵送排(pai)量(liang)降低，攪拌無(wu)(wu)力(li)，攪拌轉速下(xia)降等。因此，要定期檢查(cha)這些元(yuan)件(jian)，定期更(geng)換(huan)相應(ying)的(de)密封元(yuan)件(jian)，及(ji)時對已損壞、拉(la)傷的(de)零件(jian)進(jin)行更(geng)換(huan)或修(xiu)理，甚至更(geng)換(huan)相應(ying)的(de)液(ye)壓元(yuan)件(jian)，從而避免由于元(yuan)件(jian)泄(xie)(xie)漏而造成的(de)系(xi)(xi)(xi)(xi)統(tong)發(fa)熱(re)(re)。

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(kai)機率(lv)和(he)延(yan)長使用壽(shou)命。