為了提高轉換小臂2閥芯將小臂1挖掘機設備維修閥芯的轉換和油口Pa9壓力的增加企業同時學生進行，這將直接關閉工作空檔管路（E）。挖掘機維修最重要的三個參數：操作重量（質量），發動機功率和鏟斗斗容。修理挖掘機常見的挖掘機結構包括，動力裝置，工作裝置，回轉機構，操縱機構，傳動機構，行走機構和輔助設施等。維修挖掘機第一(yi)(yi)臺液(ye)(ye)壓挖(wa)掘機(ji)由(you)法國波克(ke)蘭工廠(chang)發(fa)明成(cheng)功。由(you)于液(ye)(ye)壓技(ji)術(shu)的(de)應(ying)用，20世紀40年代有了在拖(tuo)拉(la)機(ji)上(shang)配裝液(ye)(ye)壓反鏟地懸(xuan)掛式挖(wa)掘機(ji)。油(you)(you)(you)口(kou)P2輸(shu)出(chu)的(de)液(ye)(ye)壓油(you)(you)(you)必須經(jing)(jing)過市場空檔管(guan)(guan)路(lu)（E）推開雙通單向閥(fa)(fa)（3），并經(jing)(jing)過系(xi)統(tong)管(guan)(guan)路(lu)（G）、小臂2閥(fa)(fa)芯(xin)頸(jing)部和(he)管(guan)(guan)路(lu)（1）流(liu)(liu)(liu)入(ru)我國液(ye)(ye)壓控(kong)制油(you)(you)(you)缸油(you)(you)(you)口(kou)A5。與此發(fa)展同(tong)時，油(you)(you)(you)口(kou)P2輸(shu)出(chu)以及液(ye)(ye)壓油(you)(you)(you)的(de)一(yi)(yi)部分將(jiang)經(jing)(jing)過研究平行(xing)進口(kou)管(guan)(guan)路(lu)（F）、環(huan)形(xing)(xing)節流(liu)(liu)(liu)（H）、平行(xing)設置單向閥(fa)(fa)（4）、管(guan)(guan)路(lu)（G）和(he)管(guan)(guan)路(lu)（1）流(liu)(liu)(liu)入(ru)中國液(ye)(ye)壓提升油(you)(you)(you)缸油(you)(you)(you)口(kou)A5。液(ye)(ye)壓動力(li)油(you)(you)(you)缸油(you)(you)(you)口(kou)B5輸(shu)出(chu)的(de)回(hui)(hui)油(you)(you)(you)經(jing)(jing)過小臂1閥(fa)(fa)芯(xin)頸(jing)部活動流(liu)(liu)(liu)入(ru)回(hui)(hui)油(you)(you)(you)管(guan)(guan)路(lu)，同(tong)時也可以選(xuan)擇通過分析(xi)管(guan)(guan)路(lu)（J）和(he)小臂2閥(fa)(fa)芯(xin)頸(jing)部流(liu)(liu)(liu)入(ru)回(hui)(hui)油(you)(you)(you)管(guan)(guan)路(lu)。環(huan)形(xing)(xing)節流(liu)(liu)(liu)（D）作(zuo)為社會主要問題(ti)限制以完成(cheng)與回(hui)(hui)轉的(de)同(tong)步技(ji)術(shu)操作(zuo)。環(huan)形(xing)(xing)節流(liu)(liu)(liu)（H）作(zuo)為一(yi)(yi)種主要因素限制以完成(cheng)與大(da)臂的(de)同(tong)步管(guan)(guan)理操作(zuo)使用挖(wa)掘機(ji)產品修理。

2.加(jia)載（雙泵匯流(liu)(liu))(圖8）將關(guan)閉(bi)間隙線(xian)(xian)(A)通(tong)(tong)(tong)過(guo)(guo)轉(zhuan)換(huan)前(qian)(qian)(qian)(qian)臂(bei)1芯(xin)(xin)通(tong)(tong)(tong)過(guo)(guo)Pb5加(jia)壓(ya)油(you)(you)(you)(you)(you)(you)(you)(you)口(kou)(kou)(kou)(kou)。 從(cong)出(chu)(chu)(chu)(chu)油(you)(you)(you)(you)(you)(you)(you)(you)口(kou)(kou)(kou)(kou)P1流(liu)(liu)出(chu)(chu)(chu)(chu)的液(ye)壓(ya)油(you)(you)(you)(you)(you)(you)(you)(you)通(tong)(tong)(tong)過(guo)(guo)空線(xian)(xian)(A)推(tui)動雙通(tong)(tong)(tong)單(dan)向(xiang)閥(fa)(fa)(fa)（1）流(liu)(liu)入(ru)(ru)(ru)油(you)(you)(you)(you)(you)(you)(you)(you)缸(gang)(gang)出(chu)(chu)(chu)(chu)口(kou)(kou)(kou)(kou)B5.. 同(tong)時(shi)，從(cong)出(chu)(chu)(chu)(chu)油(you)(you)(you)(you)(you)(you)(you)(you)口(kou)(kou)(kou)(kou)P1流(liu)(liu)出(chu)(chu)(chu)(chu)的部(bu)分液(ye)壓(ya)油(you)(you)(you)(you)(you)(you)(you)(you)將通(tong)(tong)(tong)過(guo)(guo)平(ping)行線(xian)(xian)(B)、環(huan)節流(liu)(liu)(D)、平(ping)行單(dan)向(xiang)閥(fa)(fa)(fa)（2）和(he)線(xian)(xian)(C)B5流(liu)(liu)入(ru)(ru)(ru)油(you)(you)(you)(you)(you)(you)(you)(you)缸(gang)(gang)出(chu)(chu)(chu)(chu)口(kou)(kou)(kou)(kou)為了轉(zhuan)換(huan)前(qian)(qian)(qian)(qian)臂(bei)2芯(xin)(xin)，同(tong)時(shi)進行前(qian)(qian)(qian)(qian)臂(bei)1芯(xin)(xin)的轉(zhuan)換(huan)和(he)油(you)(you)(you)(you)(you)(you)(you)(you)口(kou)(kou)(kou)(kou)Pb9的加(jia)壓(ya)，這將關(guan)閉(bi)間隙線(xian)(xian)(E)。 從(cong)出(chu)(chu)(chu)(chu)油(you)(you)(you)(you)(you)(you)(you)(you)口(kou)(kou)(kou)(kou)P2流(liu)(liu)出(chu)(chu)(chu)(chu)的液(ye)壓(ya)油(you)(you)(you)(you)(you)(you)(you)(you)通(tong)(tong)(tong)過(guo)(guo)間隙線(xian)(xian)(E)推(tui)動雙通(tong)(tong)(tong)單(dan)向(xiang)閥(fa)(fa)(fa)（3）流(liu)(liu)入(ru)(ru)(ru)油(you)(you)(you)(you)(you)(you)(you)(you)缸(gang)(gang)出(chu)(chu)(chu)(chu)口(kou)(kou)(kou)(kou)A5..通(tong)(tong)(tong)過(guo)(guo)前(qian)(qian)(qian)(qian)臂(bei)2芯(xin)(xin)的線(xian)(xian)(G)、頸部(bu)和(he)線(xian)(xian)(I)，同(tong)時(shi)，從(cong)油(you)(you)(you)(you)(you)(you)(you)(you)出(chu)(chu)(chu)(chu)口(kou)(kou)(kou)(kou)P2流(liu)(liu)出(chu)(chu)(chu)(chu)的部(bu)分液(ye)壓(ya)油(you)(you)(you)(you)(you)(you)(you)(you)將通(tong)(tong)(tong)過(guo)(guo)平(ping)行線(xian)(xian)(F)、環(huan)形節流(liu)(liu)(H)、雙通(tong)(tong)(tong)單(dan)向(xiang)閥(fa)(fa)(fa)（4）、線(xian)(xian)(G)和(he)線(xian)(xian)(I)流(liu)(liu)入(ru)(ru)(ru)油(you)(you)(you)(you)(you)(you)(you)(you)出(chu)(chu)(chu)(chu)口(kou)(kou)(kou)(kou)B5。 油(you)(you)(you)(you)(you)(you)(you)(you)缸(gang)(gang)從(cong)油(you)(you)(you)(you)(you)(you)(you)(you)缸(gang)(gang)出(chu)(chu)(chu)(chu)口(kou)(kou)(kou)(kou)B5的回(hui)(hui)油(you)(you)(you)(you)(you)(you)(you)(you)通(tong)(tong)(tong)過(guo)(guo)前(qian)(qian)(qian)(qian)臂(bei)1芯(xin)(xin)的頸部(bu)、線(xian)(xian)(K)和(he)環(huan)節流(liu)(liu)(L)流(liu)(liu)入(ru)(ru)(ru)油(you)(you)(you)(you)(you)(you)(you)(you)箱。 此時(shi)，部(bu)分回(hui)(hui)油(you)(you)(you)(you)(you)(you)(you)(you)被阻塞以推(tui)開(kai)單(dan)向(xiang)閥(fa)(fa)(fa)（5），然后(hou)通(tong)(tong)(tong)過(guo)(guo)管道(M)流(liu)(liu)入(ru)(ru)(ru)管道(C)，從(cong)而增加(jia)流(liu)(liu)入(ru)(ru)(ru)油(you)(you)(you)(you)(you)(you)(you)(you)缸(gang)(gang)油(you)(you)(you)(you)(you)(you)(you)(you)口(kou)(kou)(kou)(kou)B5（再(zai)生油(you)(you)(you)(you)(you)(you)(you)(you)路）的油(you)(you)(you)(you)(you)(you)(you)(you)的供(gong)應。

動臂(bei)(bei)下降(jiang)（圖6），因為(wei)該閥(fa)體(ti)(ti)(ti)通(tong)(tong)(tong)(tong)過增加壓力截(jie)止端(duan)口(kou)(kou)(kou)PB8中(zhong)性線（A）和切斷油(you)向(xiang)下流動的(de)(de)(de)起(qi)重臂(bei)(bei)1轉換(huan)(huan)，因此通(tong)(tong)(tong)(tong)過平行管路的(de)(de)(de)工(gong)作油(you)的(de)(de)(de)輸出(chu)端(duan)口(kou)(kou)(kou)P2 （B）以(yi)打開單向(xiang)閥(fa)（1）和通(tong)(tong)(tong)(tong)過管線（C）和起(qi)重臂(bei)(bei)液(ye)壓缸流入(ru)閥(fa)體(ti)(ti)(ti)端(duan)口(kou)(kou)(kou)B7的(de)(de)(de)頸(jing)部(bu)。到所(suo)(suo)述提升(sheng)閥(fa)（3）轉換(huan)(huan)成的(de)(de)(de)在切換(huan)(huan)閥(fa)閥(fa)芯和起(qi)重臂(bei)(bei)1 PC2壓力增加端(duan)口(kou)(kou)(kou)這(zhe)將減(jian)少，以(yi)便打開所(suo)(suo)述提升(sheng)閥(fa)（2）在所(suo)(suo)述彈簧(huang)室（d）中(zhong)的(de)(de)(de)壓力抗偏移。通(tong)(tong)(tong)(tong)過從(cong)起(qi)重臂(bei)(bei)1輸出(chu)A7回(hui)油(you)口(kou)(kou)(kou)將流入(ru)閥(fa)體(ti)(ti)(ti)返(fan)回(hui)管線的(de)(de)(de)頸(jing)部(bu)。轉換(huan)(huan)傾(qing)卷軸(zhou)臂(bei)(bei)1（雙泵合流）（圖7），以(yi)增加壓力端(duan)口(kou)(kou)(kou)PA5轉換(huan)(huan)臂(bei)(bei)閥(fa)元件關閉所(suo)(suo)述中(zhong)性線（A）。通(tong)(tong)(tong)(tong)過中(zhong)性線（A）從(cong)端(duan)口(kou)(kou)(kou)P1輸出(chu)的(de)(de)(de)液(ye)壓油(you)以(yi)打開二通(tong)(tong)(tong)(tong)閥(fa)（1），和通(tong)(tong)(tong)(tong)過管線（C）到閥(fa)體(ti)(ti)(ti)1的(de)(de)(de)頸(jing)部(bu)和臂(bei)(bei)液(ye)壓缸的(de)(de)(de)端(duan)口(kou)(kou)(kou)A5。