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工程机械广泛用国民经济各个部门。进入70年代以来,工业发达国家在发展中小型液压挖掘机的同时,不断开发研制具有专门用途的特种挖掘机,其中包括为开发水下资源而研制的水中挖掘机和水陆两用挖掘机。初期开发的这种挖掘机斗容量为0.3～0.4m~3,用无线电遥控自动作业,作业水深3m,限制水深5m,行走速度2km/h,接地比压32kPa,最大挖掘半径7.7m,停机面最大挖深3.7m,主要用于水利建设、河道清淤等工程。
Construction machinery is widely used in various sectors of the national economy. Since the 1970s, industrial advanced countries have continued to develop special excavators with special purpose while developing small and medium hydraulic excavators, including underwater excavators and amphibious excavators developed for the development of underwater resources. The excavator bucket capacity developed in the initial stage is 0.3 to 0.4m~3, automatic operation by radio remote control, working water depth 3m, limited water depth 5m, travel speed 2km/h, ground pressure ratio 32kPa, maximum excavation radius 7.7m, shutdown surface The maximum depth of digging is 3.7m, which is mainly used for water conservancy construction, river dredging and other projects.