Load-sensitive electromagnetic proportional valve

Abstract

The invention relates to a load-sensitive electromagnetic proportional valve. The load-sensitive electromagnetic proportional valve is characterized by comprising a valve block, a reversing valve element, a left pressure compensating valve element, a left one-way valve rod, a right pressure compensating valve element and a right one-way valve rod, wherein the valve block is provided with a transverse shaft hole, a left vertical shaft hole, a right vertical shaft hole, a pressure oil hole, a first working oil hole, a second working oil hole, an oil return hole and a load pressure feedback hole;the reversing valve element is driven by an electromagnetic type drive structure to slip left and right; and a middle circulating slot, a left circulating slot and a right circulating slot, which areannular, are formed in the periphery of the reversing valve element. The electromagnetic proportional valve has a function of preventing flow saturation, integrates a plurality of hydraulic valves inone valve block, has fewer oil paths, is regular in oil path layout, is beneficial for processing, is more compact in structure, is convenient for dismounting and assembling, and enables movement ofeach valve element to be stable; and a vehicle or engineering machinery using the valve is greatly improved in operating performance, so that a phenomena that low load is too quick and high load stopsare avoided.

Description

technical field [0001] The invention belongs to the technical field of hydraulic valves, and in particular relates to a compact electromagnetic proportional valve used in hydraulic systems of various engineering machinery, agricultural machinery, mining machinery and forestry machinery. Background technique [0002] Flow saturation refers to the flow saturation state caused when the maximum flow that the pump can provide cannot meet the needs of the system. In the case of compound action of the multi-way valve, multiple actuators act at the same time, and the total flow required increases. If the pump cannot provide sufficient flow, the system cannot complete the compound action, which seriously affects the operation quality and efficiency. Anti-flow saturation means that when the system is in the state of flow saturation, the flow of each actuator is reduced at the same time, so that the total flow of the system matches the flow that the pump can provide, and the compound a...

AI Technical Summary

Problems solved by technology

In the aforementioned anti-flow saturation multi-way valve, each joint valve is essentially a three-position six-way reversing valve, and the valve body is provided with 8 oil passages. Therefore, the above-mentioned multi-way valve has at least the following disadvantages: the overall structure is complex, The size of the valve body is large and takes up a lot of space; there are many oil passages and the oil passages are intricate, and the pressure drop of the valve is too large at the maximum flow rate, the process size is difficult to guarantee, the processing is difficult, and the processing cost is high; the structure is complex and difficult to disassemble and assemble

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