Crawler-type chassis telescopic mechanism

Abstract

The invention discloses a crawler-type chassis telescopic mechanism, comprising a telescopic arm and a telescopic guide rail sheathed on the telescopic arm, wherein a sliding gap is arranged between the telescopic arm and the telescopic guide rail, and the telescopic arm slides along the extending direction of the telescopic guide rail in a reciprocating way. The telescopic mechanism is characterized in thatthe left and right upper sides of the telescopic arm and the top of the telescopic guide rail are inclined planes, the included angles between the left and right upper sides and the top surface are 10-60 degrees, an upper limit block is respectively arranged on the left and right upper sides of the telescopic guide rail between the telescopic arm and the telescopic guide rail, and a sliding gap is arranged between each upper limit block and the telescopic arm. In the invention, an inclined telescopic arm and the upper side of the telescopic guide rail are arranged, and a limit block is arranged at the inner side of the inclined plane of the telescopic guide rail, so that the limit block is appressed with the inclined plane of the telescopic arm under the action of gravity, limit of the telescopic arm in the left and right directions is realized, the telescopic arm is prevented form moving left and right, the phenomenon that the chassis pulls to one side is avoided, and rgw operation stability is improved.

Description

technical field [0001] The invention relates to a walking device for engineering machinery, in particular to a crawler-type chassis telescopic mechanism, which is mainly used in a crawler-type telescopic traveling device. Background technique [0002] The crawler-type telescopic chassis adjusts the gauge of the chassis through the expansion and contraction of the oil cylinder. It is used on the traveling device of large-scale construction machinery. . [0003] During the expansion and contraction process of the chassis, the telescopic arm connected to the track frame will slide along the telescopic guide rail. In the prior art, the cross-sectional shape of the telescopic arm and the telescopic guide rail is mostly a rectangular structure, such as figure 1 shown. Through analysis, the advantages of the rectangular structure of the telescopic arm and the telescopic guide rail are: the contact between the telescopic arm and the telescopic guide rail is surface-to-face, the fo...

AI Technical Summary

Problems solved by technology

Through analysis, the advantages of the rectangular structure of the telescopic arm and the telescopic guide rail are: the contact between the telescopic arm and the telescopic guide rail is surface-to-face, the force-bearing area is large, and the force per unit area is small, which is conducive to the dispersion of force; and its disadvantages Yes: poor assembly welding accuracy, uneven movable gap between the telescopic arm and the telescopic guide rail, which affects the expansion and contraction of the frame; the other guide rail is a sleeve type, such as a Chinese invention patent application for rotary drilling. The telescopic chassis structure (CN101832104A) replaces the welded square tube with an integral round tube. The rigidity and stability of the telescopic telescopic chassis are improved, and the uneven gap between the inner and outer tubes caused by the welding is avoided.

[0004]However, the telescopic chassis of the above two structures all have gaps necessary for telescopic expansion. The traveling device will move during the traveling process, which will easily cause the deviation of the whole machine and affect the working accuracy of the whole machine

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