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到目前为止,挖掘机及起重机械制造中的类型尺寸尚缺乏严格的規律性,并且从它們的型号看来,結构大半是多种多样的。通常,工厂或主管机关还没有考虑到結构的标准化和統一化,就出現了挖掘机或起重机的各种型号。型号基本上是供生产用,在一个厂內每年計划一般不超过1000台,而在很多情况下尚不到500台。甚至同一型式尺寸的型号有着不同的結构系統和部件。例如:0.3～0.4米~3一級的履带式挖掘机(Э—303、Э—352及ТЭ—3),虽然其工作机构的速度和受力情况大致相同,但却具有各种各样的传动系統和同名部件具有不同的結构。在自行式动臂起重机
So far, the types of sizes used in the manufacture of excavators and cranes have not been strictly regular, and the structure of the excavators and cranes has been largely varied. Normally, factories or authorities have not considered the standardization and unification of the structure, and various types of excavators or cranes have emerged. The model is basically for production purposes. In a factory, the annual plan is generally not more than 1,000 units, and in many cases it is less than 500 units. Even the same size model has different structural systems and components. For example: 0.3 to 0.4 m to 3 grade crawler excavators (Э-303, Э-352 and ТЭ-3), although their working mechanism speed and force conditions are roughly the same, but it has a variety of transmission The system and the components of the same name have different structures. Self-propelled boom crane