隨著現(xian)代工(gong)(gong)(gong)(gong)業的(de)(de)興起，以混(hun)(hun)凝(ning)土(tu)為(wei)主(zhu)材料的(de)(de)建(jian)設(she)方式(shi)(shi)已經成為(wei)了(le)建(jian)筑(zhu)業施(shi)工(gong)(gong)(gong)(gong)的(de)(de)主(zhu)要構造之(zhi)一(yi)，在各(ge)種(zhong)工(gong)(gong)(gong)(gong)程施(shi)工(gong)(gong)(gong)(gong)建(jian)設(she)中(zhong)(zhong)占據了(le)很大的(de)(de)比例，使得混(hun)(hun)凝(ning)土(tu)機械的(de)(de)發展(zhan)經久不衰(shuai)，且有越(yue)演越(yue)烈的(de)(de)形勢。拖(tuo)式(shi)(shi)混(hun)(hun)凝(ning)土(tu)泵，簡(jian)稱(cheng)拖(tuo)泵，是各(ge)種(zhong)混(hun)(hun)凝(ning)土(tu)機械中(zhong)(zhong)的(de)(de)一(yi)種(zhong)，用(yong)于混(hun)(hun)凝(ning)土(tu)施(shi)工(gong)(gong)(gong)(gong)中(zhong)(zhong)的(de)(de)輸送和(he)澆(jiao)注工(gong)(gong)(gong)(gong)作。

拖泵分類選型

37千(qian)(qian)(qian)(qian)(qian)瓦(wa)(wa)(wa)（目前(qian)國內標準混凝(ning)土泵，37千(qian)(qian)(qian)(qian)(qian)瓦(wa)(wa)(wa)以(yi)下為細石砂漿泵）、45千(qian)(qian)(qian)(qian)(qian)瓦(wa)(wa)(wa)、55千(qian)(qian)(qian)(qian)(qian)瓦(wa)(wa)(wa)、75千(qian)(qian)(qian)(qian)(qian)瓦(wa)(wa)(wa)、90千(qian)(qian)(qian)(qian)(qian)瓦(wa)(wa)(wa)、110千(qian)(qian)(qian)(qian)(qian)瓦(wa)(wa)(wa)、130千(qian)(qian)(qian)(qian)(qian)瓦(wa)(wa)(wa)（柴(chai)油）、132千(qian)(qian)(qian)(qian)(qian)瓦(wa)(wa)(wa)、162千(qian)(qian)(qian)(qian)(qian)瓦(wa)(wa)(wa)（柴(chai)油）、174千(qian)(qian)(qian)(qian)(qian)瓦(wa)(wa)(wa)（柴(chai)油）等(deng)。

選擇多大電(dian)機混凝(ning)土泵(beng)，首先要考慮變(bian)壓器容量(liang)，其次考慮距離混凝(ning)土泵(beng)的遠近和線徑(jing)大小，以免壓降過(guo)大造成(cheng)(cheng)電(dian)流(liu)增高或跳閘停機，過(guo)大功率(lv)造成(cheng)(cheng)成(cheng)(cheng)本(ben)增加和使用不(bu)便。電(dian)機過(guo)小，同時也(ye)滿(man)足不(bu)了(le)工程需要。

混(hun)凝(ning)土(tu)輸(shu)送(song)泵功率、混(hun)凝(ning)土(tu)輸(shu)送(song)泵出口壓力、混(hun)凝(ning)土(tu)輸(shu)送(song)泵輸(shu)送(song)量之間的關(guan)系

一臺(tai)混凝土輸(shu)送泵的(de)(de)電機功(gong)率(lv)是(shi)決定出(chu)口壓力(li)和輸(shu)送方量(liang)的(de)(de)前提條件，在電機功(gong)率(lv)一定的(de)(de)情(qing)況下，壓力(li)的(de)(de)升高必將使輸(shu)送量(liang)降低(di)；相(xiang)反，降低(di)出(chu)口壓力(li)，將會使輸(shu)送量(liang)增加。

為了保證(zheng)混(hun)凝(ning)土輸送(song)泵(beng)既要有較大(da)(da)輸送(song)量(liang)，又能(neng)有一定(ding)的出口壓(ya)力和(he)與之相(xiang)匹配的經濟功(gong)率，在混(hun)凝(ning)土輸送(song)泵(beng)的設(she)計中，大(da)(da)都采用(yong)了恒功(gong)率柱塞泵(beng)；即恒功(gong)率值選定(ding)后，當出口壓(ya)力升高時，油泵(beng)輸出排(pai)量(liang)會(hui)自動降低，達(da)(da)到與功(gong)率設(she)計相(xiang)對(dui)應的值；如果既要達(da)(da)到出口壓(ya)力高，又想(xiang)得到輸送(song)量(liang)大(da)(da)的目的。惟一的途徑就是增加電(dian)機功(gong)率。

因(yin)此，在(zai)國家新標準中，引用(yong)(yong)了混(hun)凝土(tu)輸(shu)送(song)泵的能(neng)(neng)力(li)指數概(gai)念（以MPa·m3/h為度量(liang)單位）；即混(hun)凝土(tu)輸(shu)送(song)泵的實(shi)際(ji)(ji)出(chu)口(kou)(kou)壓(ya)力(li)與(yu)每小(xiao)時實(shi)際(ji)(ji)輸(shu)送(song)量(liang)之乘(cheng)積，該值(zhi)越大(da)，其能(neng)(neng)力(li)指數也越大(da)，電(dian)(dian)機的功率也將越大(da)，由此實(shi)現(xian)大(da)排量(liang)、高(gao)揚程的目(mu)的。科尼(ni)樂公(gong)司(si)在(zai)設(she)計時，還采用(yong)(yong)了高(gao)低壓(ya)切換的功能(neng)(neng)設(she)計，以滿足不同的施工要求(qiu)，在(zai)經濟狀(zhuang)態下，又能(neng)(neng)產生較大(da)的輸(shu)送(song)量(liang)，或者以相同的電(dian)(dian)機功率，產生較高(gao)的出(chu)口(kou)(kou)壓(ya)力(li)。