隨著現代工(gong)(gong)(gong)(gong)業的(de)興(xing)起(qi)，以混(hun)凝(ning)(ning)土(tu)(tu)為主(zhu)材料的(de)建(jian)設(she)方式已經成(cheng)為了建(jian)筑業施工(gong)(gong)(gong)(gong)的(de)主(zhu)要構造之(zhi)一(yi)(yi)，在(zai)各種工(gong)(gong)(gong)(gong)程施工(gong)(gong)(gong)(gong)建(jian)設(she)中(zhong)占據了很大的(de)比例，使得混(hun)凝(ning)(ning)土(tu)(tu)機(ji)械(xie)(xie)的(de)發(fa)展經久不衰，且有(you)越(yue)演越(yue)烈的(de)形勢。拖式混(hun)凝(ning)(ning)土(tu)(tu)泵，簡(jian)稱(cheng)拖泵，是各種混(hun)凝(ning)(ning)土(tu)(tu)機(ji)械(xie)(xie)中(zhong)的(de)一(yi)(yi)種，用于混(hun)凝(ning)(ning)土(tu)(tu)施工(gong)(gong)(gong)(gong)中(zhong)的(de)輸送(song)和澆注(zhu)工(gong)(gong)(gong)(gong)作(zuo)。

拖泵分類選型

37千(qian)(qian)(qian)(qian)(qian)瓦（目前(qian)國內標準混凝(ning)土泵(beng)，37千(qian)(qian)(qian)(qian)(qian)瓦以下為細石砂(sha)漿泵(beng)）、45千(qian)(qian)(qian)(qian)(qian)瓦、55千(qian)(qian)(qian)(qian)(qian)瓦、75千(qian)(qian)(qian)(qian)(qian)瓦、90千(qian)(qian)(qian)(qian)(qian)瓦、110千(qian)(qian)(qian)(qian)(qian)瓦、130千(qian)(qian)(qian)(qian)(qian)瓦（柴油）、132千(qian)(qian)(qian)(qian)(qian)瓦、162千(qian)(qian)(qian)(qian)(qian)瓦（柴油）、174千(qian)(qian)(qian)(qian)(qian)瓦（柴油）等。

選擇多大(da)電機混凝土泵(beng)(beng)，首先要考(kao)慮變(bian)壓器容(rong)量，其次考(kao)慮距(ju)離混凝土泵(beng)(beng)的遠近和線徑大(da)小，以免(mian)壓降過大(da)造成(cheng)電流增高或跳閘停(ting)機，過大(da)功率造成(cheng)成(cheng)本(ben)增加(jia)和使(shi)用(yong)不便(bian)。電機過小，同(tong)時也(ye)滿足不了工程需要。

混凝(ning)土輸(shu)(shu)(shu)送(song)泵功率、混凝(ning)土輸(shu)(shu)(shu)送(song)泵出口壓力、混凝(ning)土輸(shu)(shu)(shu)送(song)泵輸(shu)(shu)(shu)送(song)量之(zhi)間的(de)關系(xi)

一(yi)臺混凝土輸送泵的(de)電(dian)機功(gong)率是決定出口(kou)(kou)壓力(li)(li)和輸送方量的(de)前提條件，在(zai)電(dian)機功(gong)率一(yi)定的(de)情況下，壓力(li)(li)的(de)升高必(bi)將使輸送量降(jiang)低(di)；相反，降(jiang)低(di)出口(kou)(kou)壓力(li)(li)，將會(hui)使輸送量增加。

為了保(bao)證混(hun)凝土輸(shu)送泵(beng)既要有較大(da)輸(shu)送量，又能有一(yi)定的(de)(de)(de)(de)出口(kou)壓(ya)(ya)力(li)和與之相(xiang)匹配的(de)(de)(de)(de)經濟(ji)功(gong)(gong)率(lv)，在混(hun)凝土輸(shu)送泵(beng)的(de)(de)(de)(de)設(she)計(ji)中，大(da)都采用了恒(heng)功(gong)(gong)率(lv)柱塞泵(beng)；即恒(heng)功(gong)(gong)率(lv)值選定后(hou)，當(dang)出口(kou)壓(ya)(ya)力(li)升高時，油泵(beng)輸(shu)出排量會自動(dong)降低，達到(dao)與功(gong)(gong)率(lv)設(she)計(ji)相(xiang)對應的(de)(de)(de)(de)值；如果既要達到(dao)出口(kou)壓(ya)(ya)力(li)高，又想得到(dao)輸(shu)送量大(da)的(de)(de)(de)(de)目的(de)(de)(de)(de)。惟一(yi)的(de)(de)(de)(de)途徑(jing)就(jiu)是(shi)增加電機功(gong)(gong)率(lv)。

因此，在(zai)國(guo)家新標準中，引用了混(hun)(hun)凝(ning)土(tu)輸(shu)送(song)泵的(de)(de)(de)能力指數概念（以(yi)MPa·m3/h為度量單位）；即混(hun)(hun)凝(ning)土(tu)輸(shu)送(song)泵的(de)(de)(de)實際出(chu)口(kou)壓(ya)力與每小時(shi)實際輸(shu)送(song)量之乘積，該(gai)值越(yue)大(da)(da)，其能力指數也(ye)越(yue)大(da)(da)，電機的(de)(de)(de)功率也(ye)將越(yue)大(da)(da)，由(you)此實現大(da)(da)排量、高揚程的(de)(de)(de)目的(de)(de)(de)。科尼樂(le)公司(si)在(zai)設計時(shi)，還(huan)采用了高低壓(ya)切換的(de)(de)(de)功能設計，以(yi)滿足不(bu)同的(de)(de)(de)施(shi)工要(yao)求，在(zai)經(jing)濟狀態(tai)下(xia)，又能產生較大(da)(da)的(de)(de)(de)輸(shu)送(song)量，或者以(yi)相同的(de)(de)(de)電機功率，產生較高的(de)(de)(de)出(chu)口(kou)壓(ya)力。