分類:技術知識(shi)發布時間(jian):2015/09/25
液壓(ya)系統的(de)(de)發熱(re)(re)按發熱(re)(re)原(yuan)(yuan)因可分為兩大類(lei)(lei):一類(lei)(lei)是由于設計的(de)(de)原(yuan)(yuan)因造成的(de)(de)發熱(re)(re);一類(lei)(lei)是由于液壓(ya)元件故障(zhang)或使用不(bu)當的(de)(de)原(yuan)(yuan)因,造成的(de)(de)發熱(re)(re)。顯然,發熱(re)(re)原(yuan)(yuan)因不(bu)同(tong),其排除(chu)方法也不(bu)一樣。
1設計不合理,造成液壓系統的發熱及其排除
(1)液壓(ya)油(you)(you)(you)的(de)(de)(de)(de)(de)油(you)(you)(you)號選用不當(dang),可(ke)能造成液壓(ya)系(xi)統(tong)的(de)(de)(de)(de)(de)發熱所(suo)選液壓(ya)油(you)(you)(you)在油(you)(you)(you)溫較低時,系(xi)統(tong)正(zheng)常(chang)工(gong)作(zuo)(zuo),但系(xi)統(tong)工(gong)作(zuo)(zuo)一段時間后,油(you)(you)(you)溫升(sheng)高,液壓(ya)油(you)(you)(you)黏度(du)(du)下降(jiang),造成系(xi)統(tong)內(nei)部(bu)泄(xie)(xie)漏(lou)增加,伴隨泄(xie)(xie)漏(lou)的(de)(de)(de)(de)(de)增加更促使了油(you)(you)(you)溫的(de)(de)(de)(de)(de)上升(sheng),形成油(you)(you)(you)溫的(de)(de)(de)(de)(de)惡性(xing)循環。解決的(de)(de)(de)(de)(de)方法是:根據系(xi)統(tong)的(de)(de)(de)(de)(de)負(fu)載及正(zheng)常(chang)工(gong)作(zuo)(zuo)溫度(du)(du)要求,選擇(ze)合適黏度(du)(du)的(de)(de)(de)(de)(de)液壓(ya)油(you)(you)(you)。
(2)油(you)(you)(you)(you)(you)(you)箱設計不(bu)(bu)合理(li),使液(ye)(ye)壓系統(tong)散熱(re)(re)效果(guo)降低(di)系統(tong)發熱(re)(re)油(you)(you)(you)(you)(you)(you)箱的(de)(de)主要(yao)功(gong)能是(shi)儲(chu)存(cun)液(ye)(ye)壓油(you)(you)(you)(you)(you)(you),但它同時兼有散熱(re)(re)、沉淀雜質(zhi)、分(fen)(fen)離(li)水分(fen)(fen)的(de)(de)作用。油(you)(you)(you)(you)(you)(you)箱設計不(bu)(bu)合理(li),主要(yao)表現在兩個方(fang)面:一(yi)是(shi)油(you)(you)(you)(you)(you)(you)箱體積(ji)(ji)設計過小,由(you)于混凝土泵(beng)屬移動型(xing)液(ye)(ye)壓設備,油(you)(you)(you)(you)(you)(you)箱體積(ji)(ji)一(yi)般(ban)為液(ye)(ye)壓泵(beng)流量(liang)的(de)(de)一(yi)倍左右,因此,油(you)(you)(you)(you)(you)(you)箱散熱(re)(re)面積(ji)(ji)及(ji)儲(chu)油(you)(you)(you)(you)(you)(you)量(liang)均較小;二是(shi)有些(xie)油(you)(you)(you)(you)(you)(you)箱在結(jie)構上設計不(bu)(bu)合理(li),吸(xi)油(you)(you)(you)(you)(you)(you)管(guan)口(kou)(kou)和回油(you)(you)(you)(you)(you)(you)管(guan)口(kou)(kou)較近,中間又不(bu)(bu)設隔板,從而縮(suo)短了油(you)(you)(you)(you)(you)(you)液(ye)(ye)在油(you)(you)(you)(you)(you)(you)箱內的(de)(de)冷(leng)卻循(xun)環及(ji)沉淀雜質(zhi)的(de)(de)路徑,甚至造成大部分(fen)(fen)回油(you)(you)(you)(you)(you)(you)直(zhi)接進入吸(xi)油(you)(you)(you)(you)(you)(you)管(guan),使油(you)(you)(you)(you)(you)(you)箱的(de)(de)散熱(re)(re)效果(guo)降低(di),油(you)(you)(you)(you)(you)(you)溫升高。解決方(fang)法是(shi):適當增(zeng)加油(you)(you)(you)(you)(you)(you)箱體積(ji)(ji),使油(you)(you)(you)(you)(you)(you)箱體積(ji)(ji)為(1125~115)Q,并盡量(liang)加大吸(xi)油(you)(you)(you)(you)(you)(you)管(guan)口(kou)(kou)與回油(you)(you)(you)(you)(you)(you)管(guan)口(kou)(kou)之(zhi)間的(de)(de)距離(li),吸(xi)、回油(you)(you)(you)(you)(you)(you)管(guan)之(zhi)間應設置隔板,以確保油(you)(you)(you)(you)(you)(you)箱應有的(de)(de)散熱(re)(re)功(gong)率。
(3)散(san)(san)(san)熱(re)流(liu)(liu)(liu)量較(jiao)(jiao)小(xiao)(xiao),冷(leng)(leng)(leng)(leng)卻(que)(que)(que)器(qi)(qi)安裝(zhuang)位置(zhi)不合理,使(shi)(shi)系(xi)(xi)(xi)統(tong)(tong)散(san)(san)(san)熱(re)能(neng)力降低(di)混凝(ning)(ning)土(tu)泵的(de)(de)冷(leng)(leng)(leng)(leng)卻(que)(que)(que)方式有風(feng)(feng)(feng)冷(leng)(leng)(leng)(leng)和水冷(leng)(leng)(leng)(leng)兩種,用(yong)(yong)(yong)戶(hu)可(ke)根據(ju)實際情況(kuang)選用(yong)(yong)(yong),但(dan)一(yi)(yi)般采用(yong)(yong)(yong)風(feng)(feng)(feng)冷(leng)(leng)(leng)(leng)較(jiao)(jiao)多。有些混凝(ning)(ning)土(tu)泵因考慮冷(leng)(leng)(leng)(leng)卻(que)(que)(que)器(qi)(qi)的(de)(de)承(cheng)壓要求,將冷(leng)(leng)(leng)(leng)卻(que)(que)(que)器(qi)(qi)設(she)(she)置(zhi)在攪拌系(xi)(xi)(xi)統(tong)(tong)的(de)(de)回(hui)油路(lu)上,僅對(dui)(dui)(dui)攪拌系(xi)(xi)(xi)統(tong)(tong)的(de)(de)油液進(jin)行冷(leng)(leng)(leng)(leng)卻(que)(que)(que),因攪拌系(xi)(xi)(xi)統(tong)(tong)流(liu)(liu)(liu)量較(jiao)(jiao)小(xiao)(xiao),因此(ci)整個系(xi)(xi)(xi)統(tong)(tong)冷(leng)(leng)(leng)(leng)卻(que)(que)(que)效(xiao)果差,使(shi)(shi)系(xi)(xi)(xi)統(tong)(tong)發(fa)熱(re)。解(jie)決的(de)(de)方法:一(yi)(yi)是(shi)(shi)(shi)可(ke)采用(yong)(yong)(yong)獨立冷(leng)(leng)(leng)(leng)卻(que)(que)(que)回(hui)路(lu),提高冷(leng)(leng)(leng)(leng)卻(que)(que)(que)效(xiao)果。二(er)是(shi)(shi)(shi)將冷(leng)(leng)(leng)(leng)卻(que)(que)(que)器(qi)(qi)設(she)(she)置(zhi)在系(xi)(xi)(xi)統(tong)(tong)總回(hui)油路(lu)上,以加大(da)散(san)(san)(san)熱(re)流(liu)(liu)(liu)量,提高冷(leng)(leng)(leng)(leng)卻(que)(que)(que)效(xiao)果,但(dan)此(ci)時應(ying)注意兩個問題,個問題是(shi)(shi)(shi)冷(leng)(leng)(leng)(leng)卻(que)(que)(que)風(feng)(feng)(feng)扇(shan)的(de)(de)轉速(su)(su),冷(leng)(leng)(leng)(leng)卻(que)(que)(que)風(feng)(feng)(feng)扇(shan)的(de)(de)轉速(su)(su)不能(neng)過低(di),否則將降低(di)冷(leng)(leng)(leng)(leng)卻(que)(que)(que)效(xiao)果,可(ke)采用(yong)(yong)(yong)電(dian)動機(ji)(ji)驅動風(feng)(feng)(feng)扇(shan),或(huo)在總回(hui)油路(lu)上設(she)(she)置(zhi)一(yi)(yi)低(di)壓驅動馬(ma)達(da),使(shi)(shi)馬(ma)達(da)轉速(su)(su)與散(san)(san)(san)熱(re)流(liu)(liu)(liu)量相匹(pi)配,同時還可(ke)解(jie)決主(zhu)(zhu)回(hui)路(lu)壓力沖(chong)擊對(dui)(dui)(dui)冷(leng)(leng)(leng)(leng)卻(que)(que)(que)器(qi)(qi)承(cheng)壓能(neng)力的(de)(de)影響(xiang);第(di)二(er)個問題是(shi)(shi)(shi)如(ru)采用(yong)(yong)(yong)電(dian)動機(ji)(ji)驅動風(feng)(feng)(feng)扇(shan),主(zhu)(zhu)系(xi)(xi)(xi)統(tong)(tong)的(de)(de)壓力沖(chong)擊對(dui)(dui)(dui)冷(leng)(leng)(leng)(leng)卻(que)(que)(que)器(qi)(qi)承(cheng)壓能(neng)力的(de)(de)影響(xiang),此(ci)時,可(ke)在回(hui)油路(lu)上與冷(leng)(leng)(leng)(leng)卻(que)(que)(que)器(qi)(qi)并裝(zhuang)一(yi)(yi)個低(di)壓溢流(liu)(liu)(liu)保護閥(fa)或(huo)單(dan)向閥(fa)對(dui)(dui)(dui)冷(leng)(leng)(leng)(leng)卻(que)(que)(que)器(qi)(qi)進(jin)行高承(cheng)壓保護。
(4)液(ye)(ye)(ye)壓(ya)(ya)(ya)元(yuan)(yuan)件(jian)選(xuan)(xuan)型不(bu)當(dang),造(zao)成(cheng)系(xi)(xi)(xi)統(tong)(tong)發熱混凝土泵(beng)液(ye)(ye)(ye)壓(ya)(ya)(ya)系(xi)(xi)(xi)統(tong)(tong)一般為(wei)高壓(ya)(ya)(ya)大(da)流量(liang)(liang)(liang)(liang)系(xi)(xi)(xi)統(tong)(tong),如果系(xi)(xi)(xi)統(tong)(tong)中的(de)(de)(de)(de)液(ye)(ye)(ye)壓(ya)(ya)(ya)元(yuan)(yuan)件(jian),主要(yao)是換向閥(fa)、溢流閥(fa)和(he)順(shun)序(xu)閥(fa)規格(ge)選(xuan)(xuan)用(yong)(yong)不(bu)合(he)理,不(bu)能(neng)滿足(zu)大(da)流量(liang)(liang)(liang)(liang)要(yao)求,從(cong)而(er)在使(shi)用(yong)(yong)中,使(shi)閥(fa)口液(ye)(ye)(ye)流流速過高,造(zao)成(cheng)較(jiao)大(da)的(de)(de)(de)(de)壓(ya)(ya)(ya)力損失(shi)而(er)使(shi)油溫(wen)升高,因此(ci),液(ye)(ye)(ye)壓(ya)(ya)(ya)系(xi)(xi)(xi)統(tong)(tong)設計中在進行液(ye)(ye)(ye)壓(ya)(ya)(ya)元(yuan)(yuan)件(jian)選(xuan)(xuan)型設計時,一定要(yao)根據液(ye)(ye)(ye)壓(ya)(ya)(ya)元(yuan)(yuan)件(jian)所承(cheng)受的(de)(de)(de)(de)高工(gong)作壓(ya)(ya)(ya)力、所通過的(de)(de)(de)(de)大(da)流量(liang)(liang)(liang)(liang)以(yi)及所要(yao)求的(de)(de)(de)(de)壓(ya)(ya)(ya)力和(he)流量(liang)(liang)(liang)(liang)調整(zheng)范圍(wei)進行元(yuan)(yuan)件(jian)的(de)(de)(de)(de)選(xuan)(xuan)擇,盡量(liang)(liang)(liang)(liang)減少閥(fa)口壓(ya)(ya)(ya)力損失(shi),從(cong)而(er)減少由于(yu)液(ye)(ye)(ye)壓(ya)(ya)(ya)元(yuan)(yuan)件(jian)規格(ge)選(xuan)(xuan)用(yong)(yong)不(bu)合(he)理而(er)造(zao)成(cheng)的(de)(de)(de)(de)系(xi)(xi)(xi)統(tong)(tong)發熱。
(5)管路設(she)計、安裝不(bu)合理,造成(cheng)(cheng)壓力(li)損(sun)耗大(da),使壓力(li)能(neng)轉換成(cheng)(cheng)熱能(neng)在液壓系統設(she)計中,管路的設(she)計與安裝不(bu)能(neng)忽(hu)視,各(ge)管路管徑應嚴格按其工作壓力(li)和通過流(liu)(liu)量進行設(she)計,避(bi)免管徑設(she)計過小,造成(cheng)(cheng)流(liu)(liu)速過高,沿程壓力(li)損(sun)失過大(da),引起(qi)發熱。同時(shi),還應注意管路的安裝,既要做到外觀整齊,又要避(bi)免管路集(ji)聚及管路的急(ji)轉彎,影響管路的自然散(san)熱或造成(cheng)(cheng)局部(bu)壓力(li)損(sun)失過大(da)引起(qi)發熱。
2因液壓系統(tong)使用不當或元件故障(zhang),造成(cheng)液壓系統(tong)的發熱(re)及(ji)其排除
(1)油(you)(you)(you)箱(xiang)(xiang)內(nei)液(ye)壓油(you)(you)(you)油(you)(you)(you)面(mian)(mian)(mian)低于(yu)低液(ye)面(mian)(mian)(mian),使(shi)油(you)(you)(you)箱(xiang)(xiang)散(san)(san)熱功率降低混凝(ning)土泵在使(shi)用過程中,要(yao)隨時觀察油(you)(you)(you)箱(xiang)(xiang)內(nei)液(ye)壓油(you)(you)(you)的油(you)(you)(you)面(mian)(mian)(mian)高度,始終保持液(ye)壓油(you)(you)(you)油(you)(you)(you)面(mian)(mian)(mian)高度在正常油(you)(you)(you)位范圍(wei)內(nei),從而保證油(you)(you)(you)箱(xiang)(xiang)的散(san)(san)熱效果(guo),當油(you)(you)(you)箱(xiang)(xiang)內(nei)液(ye)壓油(you)(you)(you)油(you)(you)(you)面(mian)(mian)(mian)低于(yu)低液(ye)面(mian)(mian)(mian)時,要(yao)及時向油(you)(you)(you)箱(xiang)(xiang)內(nei)注油(you)(you)(you)。
(2)冷(leng)(leng)卻(que)(que)(que)器(qi)(qi)冷(leng)(leng)卻(que)(que)(que)效(xiao)果降(jiang)(jiang)低(di)(di),使(shi)(shi)油(you)液溫升,系(xi)(xi)統(tong)發熱(re)冷(leng)(leng)卻(que)(que)(que)器(qi)(qi)冷(leng)(leng)卻(que)(que)(que)效(xiao)果降(jiang)(jiang)低(di)(di),可(ke)能(neng)由以下原因引起(qi):a1冷(leng)(leng)卻(que)(que)(que)器(qi)(qi)內(nei)部堵塞(sai)或表(biao)面污物(wu)較(jiao)多(duo),造(zao)成(cheng)冷(leng)(leng)卻(que)(que)(que)器(qi)(qi)安全裝置開啟,冷(leng)(leng)卻(que)(que)(que)器(qi)(qi)過(guo)流量降(jiang)(jiang)低(di)(di),使(shi)(shi)散(san)熱(re)流量減少,或冷(leng)(leng)卻(que)(que)(que)器(qi)(qi)通(tong)風(feng)不(bu)良(liang),使(shi)(shi)冷(leng)(leng)卻(que)(que)(que)器(qi)(qi)的(de)冷(leng)(leng)卻(que)(que)(que)傳(chuan)熱(re)系(xi)(xi)數降(jiang)(jiang)低(di)(di),冷(leng)(leng)卻(que)(que)(que)效(xiao)果降(jiang)(jiang)低(di)(di),因此,混凝土泵在(zai)使(shi)(shi)用中一定要定期(qi)檢查,疏通(tong)冷(leng)(leng)卻(que)(que)(que)器(qi)(qi),定期(qi)對(dui)冷(leng)(leng)卻(que)(que)(que)器(qi)(qi)表(biao)面污物(wu)進行清(qing)除(chu),保證冷(leng)(leng)卻(que)(que)(que)器(qi)(qi)的(de)內(nei)部暢通(tong)和外(wai)部清(qing)潔(jie),以保證冷(leng)(leng)卻(que)(que)(que)器(qi)(qi)的(de)冷(leng)(leng)
卻效果。
冷(leng)卻(que)器(qi)安全(quan)(quan)(quan)閥或單向閥的(de)開(kai)啟壓(ya)力(li)低于標準值(zhi)(zhi),使冷(leng)卻(que)器(qi)安全(quan)(quan)(quan)保護裝置在冷(leng)卻(que)器(qi)未(wei)堵(du)塞(sai)時開(kai)啟,產生溢(yi)流分流,使冷(leng)卻(que)器(qi)散熱流量減(jian)少,因此,冷(leng)卻(que)器(qi)在使用前,一定要正(zheng)確調(diao)整安全(quan)(quan)(quan)保護裝置的(de)開(kai)啟壓(ya)力(li),在使用中要定期檢查、校正(zheng)安全(quan)(quan)(quan)保護裝置的(de)開(kai)啟壓(ya)力(li)值(zhi)(zhi)。
(3)液(ye)(ye)(ye)壓(ya)(ya)(ya)(ya)(ya)(ya)系(xi)(xi)統(tong)(tong)(tong)壓(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)(li)(li)調(diao)整(zheng)不(bu)當(dang)(dang),造成系(xi)(xi)統(tong)(tong)(tong)發熱(re)在(zai)混(hun)(hun)凝(ning)土泵(beng)液(ye)(ye)(ye)壓(ya)(ya)(ya)(ya)(ya)(ya)系(xi)(xi)統(tong)(tong)(tong)中(zhong)(zhong),由于性(xing)能要(yao)(yao)求(qiu),系(xi)(xi)統(tong)(tong)(tong)中(zhong)(zhong)往往設(she)(she)有安全(quan)閥(fa)(fa)(fa)(fa)、溢(yi)流(liu)(liu)閥(fa)(fa)(fa)(fa)和(he)順(shun)(shun)(shun)序(xu)(xu)(xu)(xu)閥(fa)(fa)(fa)(fa)等。若安全(quan)閥(fa)(fa)(fa)(fa)的(de)壓(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)(li)(li)調(diao)的(de)過(guo)(guo)(guo)低,安全(quan)閥(fa)(fa)(fa)(fa)將頻繁開(kai)啟(qi),產(chan)生溢(yi)流(liu)(liu)損失(shi),造成系(xi)(xi)統(tong)(tong)(tong)發熱(re);若壓(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)(li)(li)調(diao)整(zheng)過(guo)(guo)(guo)高(gao)(gao),又會(hui)(hui)使(shi)系(xi)(xi)統(tong)(tong)(tong)內(nei)泄漏增(zeng)(zeng)加,使(shi)系(xi)(xi)統(tong)(tong)(tong)發熱(re),因此,應按液(ye)(ye)(ye)壓(ya)(ya)(ya)(ya)(ya)(ya)系(xi)(xi)統(tong)(tong)(tong)的(de)負(fu)載要(yao)(yao)求(qiu),正確(que)(que)計算(suan)和(he)調(diao)整(zheng)安全(quan)閥(fa)(fa)(fa)(fa)和(he)壓(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)(li)(li)值(zhi),從而(er)保證系(xi)(xi)統(tong)(tong)(tong)在(zai)規定(ding)(ding)的(de)壓(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)(li)(li)范圍內(nei)工作(zuo)(zuo)。當(dang)(dang)混(hun)(hun)凝(ning)土泵(beng)泵(beng)送(song)系(xi)(xi)統(tong)(tong)(tong)主回(hui)(hui)路為閉式系(xi)(xi)統(tong)(tong)(tong)時(shi),泵(beng)送(song)系(xi)(xi)統(tong)(tong)(tong)中(zhong)(zhong)必須設(she)(she)熱(re)交(jiao)換(huan)回(hui)(hui)路,熱(re)交(jiao)換(huan)回(hui)(hui)路中(zhong)(zhong)溢(yi)流(liu)(liu)閥(fa)(fa)(fa)(fa)的(de)設(she)(she)定(ding)(ding)壓(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)(li)(li)應引起(qi)(qi)重視,設(she)(she)定(ding)(ding)壓(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)(li)(li)過(guo)(guo)(guo)低,會(hui)(hui)使(shi)泵(beng)送(song)液(ye)(ye)(ye)壓(ya)(ya)(ya)(ya)(ya)(ya)缸換(huan)向沖擊增(zeng)(zeng)加,設(she)(she)定(ding)(ding)壓(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)(li)(li)過(guo)(guo)(guo)高(gao)(gao),會(hui)(hui)使(shi)溢(yi)流(liu)(liu)損失(shi)過(guo)(guo)(guo)大,系(xi)(xi)統(tong)(tong)(tong)溫(wen)升過(guo)(guo)(guo)高(gao)(gao)。因此,應合(he)理確(que)(que)定(ding)(ding)熱(re)交(jiao)換(huan)回(hui)(hui)路溢(yi)流(liu)(liu)閥(fa)(fa)(fa)(fa)的(de)調(diao)整(zheng)壓(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)(li)(li)值(zhi),一般該溢(yi)流(liu)(liu)閥(fa)(fa)(fa)(fa)的(de)調(diao)整(zheng)值(zhi)為(1~115)MPa,泵(beng)送(song)系(xi)(xi)統(tong)(tong)(tong)補(bu)油回(hui)(hui)路的(de)工作(zuo)(zuo)壓(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)(li)(li)為215MPa。當(dang)(dang)混(hun)(hun)凝(ning)土泵(beng)液(ye)(ye)(ye)壓(ya)(ya)(ya)(ya)(ya)(ya)系(xi)(xi)統(tong)(tong)(tong)中(zhong)(zhong)設(she)(she)置(zhi)順(shun)(shun)(shun)序(xu)(xu)(xu)(xu)閥(fa)(fa)(fa)(fa)時(shi),一定(ding)(ding)要(yao)(yao)了解(jie)順(shun)(shun)(shun)序(xu)(xu)(xu)(xu)閥(fa)(fa)(fa)(fa)的(de)工作(zuo)(zuo)特點,正確(que)(que)調(diao)整(zheng)順(shun)(shun)(shun)序(xu)(xu)(xu)(xu)閥(fa)(fa)(fa)(fa)的(de)工作(zuo)(zuo)壓(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)(li)(li)。如果內(nei)控式順(shun)(shun)(shun)序(xu)(xu)(xu)(xu)閥(fa)(fa)(fa)(fa)的(de)調(diao)整(zheng)壓(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)(li)(li)過(guo)(guo)(guo)高(gao)(gao),當(dang)(dang)工作(zuo)(zuo)液(ye)(ye)(ye)壓(ya)(ya)(ya)(ya)(ya)(ya)缸的(de)工作(zuo)(zuo)壓(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)(li)(li)低于其調(diao)整(zheng)壓(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)(li)(li)時(shi),順(shun)(shun)(shun)序(xu)(xu)(xu)(xu)閥(fa)(fa)(fa)(fa)閥(fa)(fa)(fa)(fa)口(kou)存在(zai)壓(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)(li)(li)損失(shi),引起(qi)(qi)溫(wen)升,造成系(xi)(xi)統(tong)(tong)(tong)發熱(re),合(he)理確(que)(que)定(ding)(ding)內(nei)控式順(shun)(shun)(shun)序(xu)(xu)(xu)(xu)閥(fa)(fa)(fa)(fa)的(de)設(she)(she)定(ding)(ding)壓(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)(li)(li),可(ke)使(shi)工作(zuo)(zuo)缸的(de)工作(zuo)(zuo)壓(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)(li)(li)高(gao)(gao)于順(shun)(shun)(shun)序(xu)(xu)(xu)(xu)閥(fa)(fa)(fa)(fa)的(de)開(kai)啟(qi)壓(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)(li)(li),順(shun)(shun)(shun)序(xu)(xu)(xu)(xu)閥(fa)(fa)(fa)(fa)工作(zuo)(zuo)時(shi),閥(fa)(fa)(fa)(fa)口(kou)將全(quan)開(kai),閥(fa)(fa)(fa)(fa)口(kou)基本無壓(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)(li)(li)損失(shi),從而(er)避免(mian)了由于順(shun)(shun)(shun)序(xu)(xu)(xu)(xu)閥(fa)(fa)(fa)(fa)設(she)(she)定(ding)(ding)壓(ya)(ya)(ya)(ya)(ya)(ya)力(li)(li)(li)(li)不(bu)當(dang)(dang)而(er)造成的(de)系(xi)(xi)統(tong)(tong)(tong)發熱(re)。
(4)內泄(xie)(xie)增(zeng)加(jia),可(ke)使(shi)油(you)(you)溫升(sheng)高,系(xi)統發(fa)熱(re)(re)混凝土泵(beng)液(ye)(ye)壓(ya)(ya)(ya)(ya)系(xi)統的(de)(de)內泄(xie)(xie),包括液(ye)(ye)壓(ya)(ya)(ya)(ya)泵(beng)、液(ye)(ye)壓(ya)(ya)(ya)(ya)缸、液(ye)(ye)壓(ya)(ya)(ya)(ya)馬(ma)達和(he)液(ye)(ye)壓(ya)(ya)(ya)(ya)閥的(de)(de)內泄(xie)(xie),壓(ya)(ya)(ya)(ya)力(li)油(you)(you)在泄(xie)(xie)漏過程中,壓(ya)(ya)(ya)(ya)力(li)下(xia)降(jiang),溫度升(sheng)高。如果(guo)系(xi)統的(de)(de)內泄(xie)(xie)增(zeng)加(jia),會(hui)引起油(you)(you)溫升(sheng)高,系(xi)統過熱(re)(re),嚴重時,會(hui)使(shi)系(xi)統壓(ya)(ya)(ya)(ya)力(li)下(xia)降(jiang),泵(beng)送(song)無(wu)力(li),泵(beng)送(song)排量(liang)降(jiang)低,攪拌無(wu)力(li),攪拌轉速下(xia)降(jiang)等。因此,要(yao)定(ding)期(qi)檢(jian)查這些(xie)元件(jian),定(ding)期(qi)更換(huan)相應的(de)(de)密封(feng)元件(jian),及時對(dui)已損壞、拉傷的(de)(de)零件(jian)進(jin)行更換(huan)或修理,甚(shen)至更換(huan)相應的(de)(de)液(ye)(ye)壓(ya)(ya)(ya)(ya)元件(jian),從而避免由于元件(jian)泄(xie)(xie)漏而造成的(de)(de)系(xi)統發(fa)熱(re)(re)。
混凝土泵 混凝土泵