General Information
Excavator boom arm is the main component of backhoe, and its structure is divided into integral type and combined type.
The integral part has the advantages of simple structure, light weight and high stiffness. Its disadvantage is that there are few replaced working devices and poor universality. It is mostly used on excavators with similar long-term operating conditions.
Integral boom can be divided into straight boom and curved boom. The straight boom has simple structure, light weight and convenient manufacture. It is mainly used for suspension excavators, but it can not obtain large excavation depth, and is not suitable for general excavators; Bending boom is the most widely used structure.
The combined boom is connected by auxiliary connecting rod (or hydraulic cylinder) or bolts. The included angle between the upper and lower boom can be adjusted by auxiliary connecting rod or hydraulic cylinder.
Although the structural operation is complex, the included angle between the upper and lower boom can be greatly adjusted at any time in the operation of excavator, so as to improve the operation performance of excavator.
Especially when excavating narrow and deep foundation pit with backhoe or grab, it is easy to obtain a large distance vertical excavation track, Improve excavation quality and productivity. The advantage of the combined boom is that the operation size and excavation capacity of the excavator can be adjusted freely according to the operation conditions, and the adjustment time is short.
In addition, it has many interchangeable working devices, which can meet the needs of various operations and facilitate loading and transportation. Its disadvantage is high quality and high manufacturing cost. It is used in small and medium-sized excavators.
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