Multi-way valve and hydraulic control system

Abstract

The invention relates to a multi-way valve and a hydraulic control system. A combined type of a plurality of working groups is adopted in the multi-way valve. Main reversing valves and corresponding pilot oil path on-off control structures are arranged in part of the working groups. The pilot oil path on-off control structures are used for controlling pilot pressure oil between pilot control oil ports and pilot control cavities of the main reversing valves to be supplied or interrupted so that working or unloading of the working groups corresponding to the main reversing valves can be achieved. Compared with an existing hydraulic control system, the hydraulic control system cam limit independent motion and is not provided with special manifold blocks for the main reversing valves of the working groups to control the pilot pressure oil, and therefore the hydraulic control system is simpler in structure and connecting pipeline.

Description

technical field

[0001] The invention relates to the field of engineering machinery, in particular to a multi-way valve and a hydraulic control system. Background technique

[0002] As a special lifting equipment, the crane usually needs to realize the following actions: lifting hook (hereinafter referred to as: lifting), lifting jib (hereinafter referred to as: luffing), slewing, walking and other operations. Due to the limited height of the boom frame of the crane, if the hook is lifted too high, the boom frame will be damaged, and if the hook is dropped too low, the number of remaining turns of the wire rope on the winch may be too small, which will cause the accident that the wire rope is separated from the winch; The angle of the boom should not be too large, otherwise it may cause the danger of the boom tilting backward, and the angle of the boom should not be too small, so as not to cause the vehicle to be unstable enough to cause a rollover accident. In order to meet...

Images