【正文】 engineering, LIAOLINGCHAOYANG mechanical engineering, LIUZHOU mechanical engineering, XIAMEN mechanical engineering, XUZHOU mechanical engineering, etc.. Currently the product’s year yield is about the history of our small scaled and multifunction loader digger, we can see that our machine has been dropping behind, its development speed is slow. Our country just started to design it by ourselves at the beginning of 70’s in last century, first the BEIJING building mechanical engineering developed successfully W Z 2 A and W Z 2hudraulic pressure loader digger, the YANTAL mechanical engineering manufactures ZW2Aand WZ2B hydraulic loader digger successfully in 1987,After that the FUJIAN mechanical engineering、 SHANDONG GUANGRAO hydraulic pressure engineering develop the loader diggers of WZ25,DFH904WZ,T55Z/W025 respectively. The LIUZHOU excavate loading、 Liuzhou Project Mechanical Limited liability pany developed WZ3025 and WZ2520 loader diggers respectively in july,2020,the SHANDONG Project Mechanical Limited liability pany successfully developed WZ3025 loader digger. 7 The products produced by the following manufacturers are mainly representing the technique level of domestic loader digger. ① the WZ3025 loader digger of CHANGLIN: the engine system adopts ins turbine pressurization engine . the rated output is 63 kNs ,the tap accords with European standard .The turn round for standard truck(front axle)is nondriven swing axle, the bearings adopt imported pieces .Choose to use imported driving axle(back axle)kitted to loader digger. Having nonmaintenance wet brake, which greatly raise the safety and the credibility of the truck belt difference speed padlock raises the draw bar performance of the whole truck .The standard truck driven by twowheel ,can be equipped with a fourwheel drive according to the customer’ demand .The hydraulic system adopts efficient gear pump system, the main parts such as pump, selector valve and redirector, all choose foreign wellknown panies’ products. ② the WZ2520 of YANTAL Project Mechanical Limited liability pany:WZ2520 loader digger takes loading machine for main part, with the head refitted to multipurpose bucket, the back end added excavation device.. The 904WZ loader digger of one drag DONGFANG red is based on the LF90 tractor whose technique is brought from Italian Fiat, with the corollary design of the agriculture engineering machine of various functions. ③ The WZ3025 if LIUZHOU Excavation car loader factory :The LIUZHOU Excavation car loader factory’s product of WZ3025 loader digger and the WZ3025 loader digger of LIUZHOU engineering machinery incorporated pany , all are new products based on the CAT technique and bine with our craftsmanship. these two models all adopt special bedrock, adopt the technology of the load telesthesia control as the same as the CAT pany .As these two models adopt variable system ,so they have higher request to cleanness and reliability of system. ④ the LIUZHOU AOLIU machine machinery incorporated pany series of loader diggers of HACH995 Engine: provided with the sophisticated turbo pressurization diesel engine, the rated output reaches to 95horsepowers, reaching to the torsional force of 384 mN? at the rotate speed of 1500ture/the minute. The core parts adopt the imported famous brand product in the world , the credibility is higher. All new external appearance is pleasing to eyes, the cab room is relatively large。因此，挖掘裝載機(jī)的國(guó)內(nèi)的發(fā)展趨勢(shì)是引進(jìn)國(guó)外的先進(jìn)技術(shù)，開(kāi)發(fā)高質(zhì)量、多功能、多品種、多規(guī)格的挖掘挖裝載機(jī)系列產(chǎn)品，加強(qiáng)基礎(chǔ)元件、部件的生產(chǎn)，尤其是提高挖掘裝載機(jī)液壓元件的質(zhì)量，以達(dá)到在滿足產(chǎn)品可靠性的前提下，降低挖掘裝載機(jī)產(chǎn)品成本，并提高挖掘裝載機(jī)產(chǎn) 品的售后服務(wù)水平。操縱機(jī)構(gòu)為機(jī)械單手柄。多種工作附件可以選配，勝任更多工作；采用挖掘裝載機(jī)專用車架。之后福建建筑機(jī)械廠、一拖、山東廣饒液壓機(jī)械廠先后研制出 WZ25 型、 DFH904WZ型、 T55Z/W 型挖掘裝載 機(jī)，到 1992 年柳州挖掘裝載機(jī)廠、柳州工程機(jī)械股份有限公司分別研制出 WZ3025 型和 WZ2520 型挖掘裝載機(jī)。挖掘裝載機(jī)分類 如下： 從結(jié)構(gòu)上來(lái)分，挖掘裝載機(jī)有兩種形式：一種是帶有側(cè)移架，另一種不帶側(cè)移架。這種形式的挖掘裝載機(jī)功能重點(diǎn)在裝載方面，在歐洲生產(chǎn)得較多，后者的挖掘工作裝置不能側(cè)移，整個(gè)挖掘工作裝置可通過(guò)回轉(zhuǎn)支承繞車架后部中心做 180176。標(biāo)準(zhǔn)車轉(zhuǎn)向橋（前橋）為非驅(qū)動(dòng)擺動(dòng)橋，軸承采用進(jìn)口件。同時(shí)它們也成為登車階梯的部分，方便操作者出入。在主減速器和輪邊減速器之間，采用全浮式半軸連接傳動(dòng)