Control method of double-telescopic system

Abstract

The invention provides a control method of a double-telescopic system. The control method comprises the specific steps that S1, a telescopic three-position seven-way reversing valve reverses, and a telescopic crane stretches out of a suspension arm; s2.1, the winch control module controls and limits reversing of a first two-position two-way reversing valve; s2.2, an oil drainage port of the telescopic three-position seven-way reversing valve is communicated with an oil way between the oil tank; s2.3, the oil tank continues to supply oil to the first-stage telescopic oil cylinder and the second-stage telescopic oil cylinder through the telescopic three-position seven-way reversing valve; s2.4, redundant hydraulic oil flows back to the oil tank through the limiting first two-position two-way reversing valve; s3, reversing the overload three-position seven-way reversing valve, and conveying hydraulic oil to a winch control module by an oil tank; s4, the winch control module controls the mooring rope to descend, and the mooring rope is lifted after hooking the goods; s5.1, overloading a second two-position two-way reversing valve for reversing; s5.2, the overload first two-position two-way reversing valve performs reversing; s5.3, the oil tank continues to supply oil to the winch control module; s5.4, redundant hydraulic oil flows back to the oil tank from the overload first two-position two-way reversing valve; and S6, the double-telescopic crane transfers the goods, and conveying is completed.

Description

technical field [0001] The invention relates to the technical field of telescopic crane systems, in particular to a control method for a double telescopic system. Background technique [0002] Ship cranes are machinery used by transport ships for lifting, loading and unloading cargo. It is an important part of ships. Due to the limited space on board, various equipment and hull structure layout are very compact, and the stability of ship cranes directly affects the cargo. Carriage safety. For the sake of safety, each ship must add a mandatory automatic limit function when the ship crane is restricted by the installation location and nearby fixed or non-fixed obstacles. The function is divided into two types: full limit and area limit. The complete restriction is the restriction that the crane is not allowed to enter the rotation area under any working conditions; the area restriction is the restriction that the crane can only rotate and enter the area when the elevation ang...

AI Technical Summary

Problems solved by technology

[0004] However, the double-telescopic crane of this application does not control the extension of the telescopic arm, so when working, it is easy to cause the telescopic arm to stretch out to the limit length and continue to stretch out to cause damage to the structure of the telescopic arm. Manually observe the extended length of the telescopic arm. When it is close to the limit length, it is necessary to manually stop the extension of the telescopic arm. Therefore, the manual workload is increased, and manual observation is prone to errors.

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