Manual and electric proportional control load-sensitive multi-way valve

Abstract

The invention discloses a manual and electric proportional control load-sensitive multi-way valve comprising an oil inlet valve body, two or more electric proportional reversing valves and an oil return valve body. A pilot pressure reducing valve connected with a system oil inlet is further arranged in the oil inlet valve body and further connected with pilot oil inlets of all the electric proportional reversing valves. A system pilot oil return opening connected with pilot oil return openings is further formed in the oil return valve body. An in-valve load feedback oil way and a shuttle valveare further arranged in each electric proportional reversing valve, and one of the in-valve load feedback oil ways is connected with a load feedback oil opening. The in-valve load feedback oil way ofeach electric proportional reversing valve is connected with a valve seat inner cavity of the corresponding shuttle valve. Inner cavities on the two sides of a valve element in the valve seat of eachshuttle valve are connected with inner cavities of two working oil openings of the corresponding electric proportional reversing valve and the in-valve load feedback oil way of the adjacent electricproportional reversing valve on the rear portion of the electric proportional reversing valve correspondingly. The manual and electric proportional control load-sensitive multi-way valve has the advantages of being relatively simple in structure, convenient to manufacture and low in cost, the working stability, coordination and reliability of a plurality of actuators are quite excellent, control precision is high, and long-term normal operation of a system can be guaranteed.

Description

technical field [0001] The invention relates to a multi-way valve, in particular to a load-sensitive multi-way valve capable of realizing manual and electric proportional control. Background technique [0002] At present, it is widely used in cranes, concrete pump trucks and other construction machinery and multi-way valves of medium and large-scale mechanical equipment with multiple mechanisms. Load pressure follow-up control system. Hydraulic load sensing technology can control the work of one or more actuators, and the fine-tuning performance is very good; on the premise of satisfying various control functions of the machine, it reduces pressure loss, improves efficiency, and has better economy; but the existing For load sensitive multi-way valves, it is necessary to set up more complex LS load pressure feedback oil circuit and control components in each directional valve. It is easy to influence each other during compound actions, the working conditions are difficult t...

AI Technical Summary

Problems solved by technology

Hydraulic load sensing technology can control the work of one or more actuators, and the fine-tuning performance is very good; on the premise of satisfying various control functions of the machine, it reduces pressure loss, improves efficiency, and has better economy; but the existing For load sensitive multi-way valves, it is necessary to set up more complex LS load pressure feedback oil circuit and control components in each directional valve. It is easy to interact with each other during compound actions, and the working conditions are difficult to stabilize. It is difficult to guarantee the stability, coordination, reliability and control accuracy of multiple actuators, and the normal operation of the system is affected.

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