Main boom luffing control system of crane and crane

Abstract

The invention discloses an amplitude-variable control system of a main arm of a crane and the crane, for improving the operation stability and the security of the crane. The amplitude-variable control system of the main arm of the crane comprises a reversing valve, amplitude-variable cylinders, rod cavity balance valves, a check valve and an oil replenishing device, wherein the reversing valve has a first working position and a second working position for respectively controlling the amplitude-variable cylinders to fall back and rise up, and comprises a first working oil hole, a second working oil hole, an oil inlet and an oil back hole; the rod cavity balance valves are arranged on rod cavity oil hole paths of the amplitude-variable cylinders and are closed when the amplitude-variable cylinders fall back and are opened when the amplitude-variable cylinders rise up; the check valve is arranged on an oil path between the first working oil hole of the reversing valve and the rod cavity balance valves and is conducted when a main arm is put down through power and is cut off when the main arm is put down through gravity; the oil replenishing device is arranged on an oil path between the oil back hole of the reversing valve and the rod cavity balance valves and is used for replenishing hydraulic oil into the rod cavities of the amplitude-variable cylinders when the main arm is put down through gravity.

Description

technical field [0001] The invention relates to the technical field of engineering machinery, in particular to a main arm amplitude control system of a crane and a crane. Background technique [0002] Such as Figure 1a As shown, the structure of the existing super-large-tonnage crane generally includes: boom 100, hoisting wire rope 110, super-lifting wire rope 120, main arm 130 and luffing oil cylinder 140, wherein one end of main arm 130 is hinged with vehicle frame 150, and the other One end is hinged with the boom 100; the luffing cylinder 140 is used to drive the luffing and lowering of the main boom 130; the hoisting wire rope 110 is wound on the arm pulley of the boom 100 to lift heavy objects; The super-lifting wire rope 120 is used to improve the stress condition and balance performance of the main arm 130 during the hoisting operation. Such as Figure 1b As shown, in the state of closing the whole vehicle, the luffing cylinder 140 is retracted and retracted, and ...

AI Technical Summary

Problems solved by technology

For super-large-tonnage cranes, the super-lifting mechanism will exert a force on the main arm to make it lean back. If the main arm is lowered by its own weight, the piston rod of the luffing cylinder 140 is likely to be pulled out of the cylinder body suddenly, thereby lead to serious safety accidents

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