Construction machinery and its box-type working device

Abstract

The invention discloses an engineering machine and a box-type working device of the engineering machine. The box-type working device is made of cast aluminum alloy. The aluminum alloy is Al-Cu-Mn series alloy or Al-Zn series alloy or Al-Si series alloy. The aluminum alloy has the smaller density and is beneficial to reducing the weight of the working device. Meanwhile, a dense and firm Al2O3 protection membrane is further easily formed on the surface of the aluminum alloy, and the corrosion resistance of the working device is improved. Due to the fact that the mechanical properties of the aluminum alloy are close to those of steel materials, the requirements for bearing acting force and resisting impact during operation can be met. In addition, the aluminum alloy has the excellent cast flowing property, cast flaws are not easily formed, and the premise is provided for the guarantee of the mechanical properties of the working device. The working procedure for mutually welding a top plate, a bottom plate and side plates into a box-type structure can also be eliminated, the number of welding joints can be reduced, the mechanical uniformity of the working device is improved, and the failure rate is reduced.

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to an engineering machinery and a box-shaped working device thereof. Background technique [0002] Construction machinery is the necessary mechanical equipment for earthwork construction, road construction and maintenance, mobile lifting and loading operations, and is an important part of my country's equipment industry. Construction machinery is widely used in national defense construction, transportation construction, energy industry construction, raw material industry construction, agriculture, forestry and water conservancy construction, industrial and public construction, urban construction, environmental protection and other fields. [0003] The working device is an important executive mechanism of construction machinery. The working device of some construction machinery adopts a box structure. Taking an excavator as an example, its working device mainly includes a box-s...

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Problems solved by technology

[0004] First of all, the density of steel is high, which leads to the heavy weight of the working device, which increases the fuel consumption of construction machinery; secondly, the forming of the working device needs to be welded many times, and the weld is often the weak part of the structural parts, so The failure rate of the working device is improved; finally, the corrosion resistance of steel needs to be improved, and a complicated coating process is usually required to ensure that the working device can be used in a variety of working conditions

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