Expandable caterpillar band underpan and caterpillar band type engineering machine with the underpan

Abstract

The invention discloses a telescopic track chassis, which comprises a left track frame, a right track frame, a left telescopic oil cylinder, a right telescopic oil cylinder and a center frame, wherein the left telescopic oil cylinder is arranged between the center frame and the left track frame; the right telescopic oil cylinder is arranged between the center frame and the right track frame; the left track frame comprises a left telescopic girder; the right track frame comprises a right telescopic girder; the left telescopic girder is matched with a left telescopic hole of the center frame; the right telescopic girder is matched with a right telescopic hole of the center frame; the telescopic direction of the left telescopic oil cylinder is parallel to a center line of the left telescopic hole; and the telescopic direction of the right telescopic oil cylinder is parallel to a center line of the right telescopic hole. Under the condition of state transition of the telescopic track chassis, the variation of the width between the left track frame and the right track frame can be realized by a hydraulic system, so that the transforming process and the operating process between an operating state and a filed transition state are simplified and the operating property of the telescopic track chassis can be improved; and simultaneously the rigidness and the strength of the telescopic track chassis under the construction state can be guaranteed.

Description

technical field [0001] The invention relates to a crawler technology of construction machinery, in particular to a retractable crawler chassis, and also to a crawler construction machinery with the chassis. Background technique [0002] Due to the adaptability and flexibility of the crawler walking mode, crawler construction machinery has become one of the most widely used construction machinery. [0003] With the development of engineering technology, engineering operations have also put forward higher requirements for crawler construction machinery. For example, in recent years, pile foundation engineering in construction projects has developed rapidly, super high buildings have continued to increase, and the diameter and depth of pile foundations have also increased. Increasing. The increase in the diameter and depth of the pile foundation puts forward higher requirements for the stability of the pile machinery. It is required that the width of the crawler chassis can be...

AI Technical Summary

Problems solved by technology

[0009] First, the state transition is complex and inconvenient to operate

According to the above description, when the transition state is changed to the working state, it is necessary to manually remove the fixing device between the outer end of the extension beam and the left and right track frames, then rotate the extension beam, and then use the telescopic cylinder to push the left and right track frames to both sides Move; when returning from the working state to the transition state, it is necessary to manually rotate the extended beam in reverse and fix it on the left and right track frames. The state transition work requires the cooperation of ground personnel and drivers to complete, resulting in The state transition process is very cumbersome

[0010] Second, it is difficult to apply to large construction machinery

In the working state, the load of the construction machinery will be much larger than the load in the transition state. At this time, the crawler chassis needs to have greater strength and rigidity. However, in the retractable crawler chassis with the above structure, the extension beam and the load The beams are connected by hinges. During construction, the force of the crawler chassis is concentrated on the hinge shaft between the extension beam and the load-bearing beam. The strength and stiffness of the crawler chassis are limited by the strength and stiffness of the hinge shaft.

Those skilled in the art can understand that the strength and rigidity of the articulated shaft are often difficult to bear large loads. Therefore, the telescopic crawler chassis with the above-mentioned structure cannot carry out construction operations with large loads, and it is difficult to apply to large-scale construction machinery

[0011] Third, the increase in the width of the job status is limited

Therefore, the increased width of the crawler chassis with the above structure is greatly limited, and it is difficult to greatly increase the longitudinal support span of construction machinery in the working state

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