Combined connecting structure for mining excavator chassis and mining excavator

Abstract

The invention discloses a combined connecting structure for a mining excavator chassis and a mining excavator. The combined connecting structure comprises a double-bearing connecting device and a longitudinal beam upper-portion connecting device. The double-bearing connecting device is mounted at a longitudinal beam side plate. The longitudinal beam upper-portion connecting device is mounted at anupper top plate of the longitudinal beam, the upper portion of a frame connecting plate is connected with the longitudinal beam upper-portion connecting device, and the lower portion of the frame connecting plate is connected with the double-bearing connecting device. By the adoption of the combined connecting structure for the mining excavator chassis and the mining excavator, bolts can be effectively protected, the yield failure is prevented, meanwhile, the overall height of the chassis is reduced, meanwhile, the design height of a frame is not limited, and the overall rigidity of the frameis also improved.

Description

technical field [0001] The invention relates to a combined connection structure for a mining excavator chassis, which belongs to the field of engineering machinery. Background technique [0002] Large-scale construction machinery, especially large-scale mining excavators, have a large chassis structure and heavy overall weight. They need to be disassembled during actual hoisting and transportation. Therefore, the chassis structure for large-scale mining excavators Generally, the chassis structure is divided into three parts: the frame structure domain in the middle, the longitudinal beam structure on both sides, which is convenient for disassembly and assembly. The longitudinal beam structure on both sides is connected with the frame structure in the middle by bolts and washers. [0003] The existing large-scale mining excavator chassis is divided into two types of assembly and connection methods: lap joint and lateral connection. The lap joint connection can easily increas...

AI Technical Summary

Problems solved by technology

[0003] The existing large-scale mining excavator chassis is divided into two types of assembly and connection methods: lap joint and lateral connection. The lap joint connection can easily increase the overall height of the chassis. In order to ensure the height limit of the chassis, The height of the middle frame is properly compressed, and the overall strength and rigidity will be weakened; while the lateral connection is directly provided with a lateral mounting plate on the longitudinal beam, and a threaded mounting hole, which is realized by using bolts. The lateral connection between the middle frame and the longitudinal beam, the bolts of this installation method are completely subjected to the combined action of shear force and tension force, and are easily damaged

[0004] Previously, the R&D personnel designed a chassis connection structure and applied for a patent. Its name is: combined construction machinery chassis connection structure (patent number: 2014204867656). Heavy, relatively poor strength when bearing bending moment and torque load, not as strong as stepped structure

At the same time, the disclosed chassis connection structure directly welds the thick plate with the longitudinal beam transverse thin plate and the longitudinal beam lateral thin plate. The transition of material “force flow” is not smooth, which is easy to cause stress concentration, and it is very easy to produce tiny cracks at the butt weld of the two plates , resulting in product defects

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