Electro-hydraulic multiple-way directional valve

Abstract

The invention discloses an electro-hydraulic multiple-way directional valve, wherein an oil inlet valve plate comprises an oil inlet valve body and a safety valve; an oil inlet P is arranged on the oil inlet valve body, a main oil channel, a working oil channel and a first oil channel are arranged in the oil inlet valve body, the main oil channel is communicated with the oil inlet P, and both of the working oil channel and the first oil channel are communicated with the main oil channel; the first oil channel is connected with a pilot oil channel, the pilot oil channel comprises a main pilot oil channel, a first pilot oil channel and a second pilot oil channel, and a pressure reducing valve is arranged at the junction of the main pilot oil channel and the first pilot oil channel; and a slide valve is arranged in the working oil channel, and the working oil channel is connected with an oil return channel via a safety valve. Additionally, directional valve plates are further provided with manual pull rods, flow collecting valves are arranged among the directional valve plates, and a throttling screw plug is arranged in the oil return channel of a pilot control oil channel. The electro-hydraulic multiple-way directional valve disclosed by the invention has the advantages of being capable of omitting a pilot pump and an oil tube, integrated in manual function and hydraulic control function, capable of changing the output flow of a working oil port via flow collection, slow in directional action, etc.

Description

technical field [0001] The invention relates to an electro-hydraulic multi-way reversing valve. Background technique [0002] The electro-hydraulic multi-way directional valve is a combination of an electromagnetic directional valve and a hydraulic-controlled multi-way directional valve. It is a control valve that uses an electromagnetic directional valve to control the pilot oil to realize the action of the directional valve and change the direction of fluid flow. Electro-hydraulic multi-way directional valves and hydraulic control directional valves are mainly used in hydraulic systems where the flow exceeds the allowable range of the normal operation of the electromagnetic directional valve, that is, the small flow controls the large flow to control the action of the actuator, or the oil control the flow direction. [0003] In the prior art, the electro-hydraulic multi-way reversing valve is mainly composed of an oil inlet valve plate, a reversing valve plate and an oil ...

AI Technical Summary

Problems solved by technology

[0004] (1) An external pilot control oil passage is required and equipped with a pilot oil pump, which makes the structure of the hydraulic system more complicated and the system cost higher

[0005] (2) Manual reversing without manual pull rod, only hydraulic control reversing function, does not have manual reversing function; once the hydraulic control function fails, the reversing function cannot be realized, and it does not have the integration of manual control and hydraulic control Single function and control means, not suitable for system requirements

[0006] (3) When the output flow of the working oil port of the reversing valve is insufficient, the output flow cannot be increased, and the adjustability of the output flow is relatively poor, which makes the adaptability of the reversing valve relatively poor

The reversing valve can be reversing on both sides. When reversing through the electromagnetic valve on the opposite side, because the oil return passage of the pilot cavity that controls the reversing of the valve stem is directly connected to the oil return port, the reversing action is very fast and relatively rapid. The impact between other components is relatively large, which is likely to cause damage and danger between the actuators due to impact, and shorten the life of the system components and the electro-hydraulic multi-way directional control valve

[0008] Due to the above technical defects in the existing electro-hydraulic multi-way directional valve, the electro-hydraulic multi-way directional valve has the disadvantages of complex hydraulic system structure, single control means, poor versatility and short service life.

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