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

A crane and oil cylinder technology, applied in the field of cranes, can solve problems such as delay, loss of user economic benefits, vehicle damage, etc., and achieve the effects of avoiding extension delay phenomenon, avoiding pipeline vibration failure, and avoiding core tube cavity cavitation problems.

Active Publication Date: 2014-03-05
XUZHOU HEAVY MASCH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] like figure 1 As shown, a system for preventing cavitation of cylinder core tubes for cranes, the system includes a telescopic switching valve (not shown in the figure), an anti-cavitation overflow valve 1, a first directional control valve 2, and a second directional control valve 8 1. The first-stage oil cylinder 5 and the second-stage oil cylinder 7. The telescopic switching valve includes a pressure oil port P and an oil return port T. The pressure oil port P is connected to the system pressure oil circuit, and the oil return port T is connected to the system oil return circuit; The anti-cavitation overflow valve 1 includes a first oil port 11 and a second oil port 12, the first oil port 11 communicates with the oil return port T of the telescopic switching valve; the first directional control valve 2 includes a first control oil port 25. The second control oil port 26, four working oil ports and two working positions, the first working oil port 23 communicates with...

Embodiment 2

[0038] like figure 2 As shown in the figure, a system for preventing cavitation of the core tube of a cylinder for a crane includes a telescopic switching valve (not shown in the figure), a direct-acting overflow valve 10, a one-way valve 9, a first directional control valve 2, a second The two-way control valve 8, the first-stage oil cylinder 5 and the second-stage oil cylinder 7, the telescopic switching valve includes a pressure oil port P and an oil return port T, the pressure oil port P is connected with the system pressure oil circuit, and the oil return port T is connected with the system return port The oil circuit is connected; the direct-acting relief valve 10 and the one-way valve 9 are arranged in parallel, the direct-acting relief valve 10 includes an inlet 102 and an outlet 101, the one-way valve 9 includes an inlet 91 and an outlet 92, and the direct-acting overflow The outlet 101 of the valve 10 and the inlet 91 of the one-way valve 9 communicate with the oil ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B21/04B66C23/693
Inventor 史先信胡小冬张晓磊刘飞
Owner XUZHOU HEAVY MASCH CO LTD
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