Telescopic system capable of preventing core tube from inhaling empty and crane

Abstract

The invention relates to a telescopic system capable of preventing a core tube from inhaling empty and a crane, wherein the telescopic system capable of preventing the core tube from inhaling empty comprises a telescopic cylinder, a telescopic control valve, a switch valve, a cylinder pin cylinder, an arm pin cylinder and a hydraulic circuit connected among the telescopic cylinder, the telescopic control valve, the switch valve, the cylinder pin cylinder and the arm pin cylinder; the telescopic cylinder is used for driving the cylinder pin cylinder and the arm pin cylinder to find an arm position, and is internally provided with the core tube; the telescopic control valve is used for controlling the passing and breaking of an oil supply line for supplying oil into the core tube; the switch valve is used for controlling the core tube to supply oil into the cylinder pin cylinder, or supply oil to the arm pin cylinder; the core tube is also connected with an oil supplementing line, and when the telescopic control valve disconnects the oil supply line and the core tube inhales empty, oil is supplemented into the core tube through the oil supplementing line. According to the telescopic system and the crane, the core tube can be prevented from being damaged due to inhaling empty and the reliability of the telescopic system is improved.

Description

technical field [0001] The invention relates to the field of construction machinery, in particular to a telescopic system and a crane capable of preventing core tubes from being sucked. Background technique [0002] With the large-scale development of construction projects, cranes are increasingly developing in the direction of large-scale. For super-large-tonnage cranes, the boom is the main load-bearing component, and its weight accounts for more than 20% of the weight of the whole machine, which is one of the key technologies restricting the development of the crane. As the number of boom sections increases, the telescopic oil cylinder develops from a rope row type to a single-cylinder pin type, thereby adapting to more boom sections. The single-cylinder plug-type telescopic boom crane is a kind of large-tonnage crane. There is only one telescopic cylinder in this telescopic boom, and the two sides of the telescopic cylinder are correspondingly equipped with cylinder pin...

AI Technical Summary

Problems solved by technology

[0004] Therefore, when the telescopic cylinder is telescopically looking for the arm position in the empty cylinder or the telescopic arm pin with the arm, there is a phenomenon that the core tube of the telescopic c

Images