Integrated electric control multi-way valve and crane

Abstract

The invention provides an integrated electric control multi-way valve and a crane. The integrated electric control multi-way valve comprises a high-pressure oil way, a pilot oil way and an oil return way; an oil inlet and return linkage, multiple working linkages and a tail plate working linkage are connected in parallel through the high-pressure oil way, the pilot oil way and the oil return way; each working linkage comprises a pressure compensation valve and a valve element; oil inlets of the pressure compensation valves communicate with the high-pressure oil way; and oil outlets of the pressure compensation valves communicate with oil inlets of the valve elements. In the integrated electric control multi-way valve, as the pressure compensation valves are arranged at the upstream of the valve elements, under the premise of satisfying constant pressure difference between two ends of the pressure compensation valve elements, the single action speed rigidity of each working linkage and the composite action flow distribution accuracy are improved, the composite action impact is reduced, and the whole machine control performance is improved.

Description

technical field [0001] The invention relates to the technical field of hydraulic systems, in particular to an integrated electronically controlled multi-way valve and a crane. Background technique [0002] At present, the multi-way valves used in small and medium-sized tonnage cranes mostly adopt the post-valve compensation mode, and are matched with load-sensitive pumps. They have four working links: telescopic, main roll lifting, auxiliary roll lifting, and lifting width. Some multi-way valves are integrated with motor braking valves. , telescopic integrated valve and other additional functions. In this system, the position of the differential pressure reducing valve and the position of the throttle valve are exchanged, that is, the pressure compensation before the throttle valve is changed to the pressure compensation after the throttle valve. Its working principle in normal operation is basically the same as that of the pre-valve system. As the opening of the orifice in...

AI Technical Summary

Problems solved by technology

[0003] The invention provides an integrated electronically controlled multi-way valve and a crane, which are used to solve the problem of poor speed rigidity in the single action of the multi-way valve in the prior art, the speed decreases with the increase of the load, and the flow distribution accuracy rate is not high in the compound action. Defects

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