Oil cylinder core tube cavitation corrosion prevention system for crane and crane with same

Abstract

The invention relates to an oil cylinder core tube cavitation corrosion prevention system for a crane and the crane with the oil cylinder core tube cavitation corrosion prevention system. The oil cylinder core tube cavitation corrosion prevention system for the crane comprises a telescopic changeover valve, a cavitation corrosion prevention overflow valve, a first directional control valve, a second directional control valve, a primary oil cylinder and a secondary oil cylinder, wherein the cavitation corrosion prevention overflow valve comprises a first oil port and a second oil port, the first directional control valve comprises a first control oil port, a second control oil port, four working oil port and two working positions, the second directional control valve comprises four working oil ports and two working positions, the primary oil cylinder comprises a core tube cavity, a rod cavity and a rodless cavity, and the secondary oil cylinder comprises a rod cavity and a rodless cavity. According to the oil cylinder core tube cavitation corrosion prevention system for the crane, due to the facts that a core tube oil supplementation channel is added, and the flow of supplemented oil is reasonably matched, the core tube cavity can be kept to be in the constant pressure state all the time, and the problem that cavitation corrosion of the core tube cavity happens due to the fact that negative pressure exists in a core tube is effectively solved; in addition, the phenomenon that extension of a third arm, a fourth arm and a fifth arm delays can be avoided, and a shaking fault of a pipeline can be prevented from happening.

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to a system for preventing cavitation of an oil cylinder core tube for a crane and a crane including the system for preventing cavitation of an oil cylinder core tube for a crane. Background technique [0002] In modern hoisting machinery, for the five-section arm rope-type telescopic system, the first-stage oil cylinder and the second-stage oil cylinder are used to achieve expansion and contraction. The expansion and contraction of the second-section arm is driven by hydraulic oil flowing through the first-stage oil cylinder. The expansion and contraction of the arm is driven by the hydraulic oil flowing through the core pipe of the primary oil cylinder and entering the secondary oil cylinder after the telescopic switching valve is switched. The expansion and contraction sequence of the five-section arm rope-type telescopic system is: when extending, first extend the first-stag...

AI Technical Summary

Problems solved by technology

After the first-stage oil cylinder is extended, because the core tube cavity of the first-stage oil cylinder cannot enter the oil, a negative pressure is formed inside, and even cavitation is caused in severe cases

In the commissioning factory area and the external market, it has been repeatedly reported that the core cavity of the first-level oil cylinder has negative pressure, and there is a delay in the extension of the three-fourth-five-section arm. In more serious cases, cavitation occurs in the core cavity of the first-level oil cylinder, which eventually causes damage to the vehicle. Damage, the user's economic benefits are lost

Images