Working link and valve port independent control type multi-way valve and engineering machinery

Abstract

The invention relates to a working unit, a valve port independent control type multi-way valve and engineering machinery, the working unit can realize independent control of an oil inlet and an oil outlet, and manual, electro-hydraulic proportional and CAN (Controller Area Network) bus control modes can be adopted. The problem of mechanical fixed connection of an oil inlet and an oil outlet of a traditional multi-way valve is solved, and the control freedom degree is increased; the problems that an existing valve with an independent valve port is complex in control and unstable in control are solved, the structure is simple, the flow control precision is high, the cost is low, and switching between the valve with the independent valve port and a traditional upstream compensation load sensitive multi-way valve can be achieved. With the development of the sensor technology and the control technology, control methods of flow calculation control, pressure calculation control and the like can be achieved on the premise that the structure of the valve body is not changed, the second main valve element is replaced with the plug, the form of a throttling opening in the first main valve element is changed, and therefore the valve body structure is simplified. The function of the upstream compensation load-sensitive multi-way valve of a traditional structure can be achieved through the working unit, and therefore the performance of the multi-way valve with the independently-controlled valve port and even the performance of engineering machinery are improved.

Description

technical field [0001] The invention relates to the technical field of hydraulic pressure, in particular to a multi-way valve with a working joint and an independently controlled valve port and construction machinery. Background technique [0002] The main engine of construction machinery is developing in the direction of intelligence and greenness. Existing construction machinery adopts the traditional slide valve form multi-way valve to control the actuator. There is a mechanical connection between the inlet and outlet ports, and only the pressure or flow and pressure loss of one chamber of the actuator can be controlled. Large size, poor state awareness, etc., and cannot meet the requirements of future electronic control and intelligent assistance for high-precision control of position / speed, which seriously affects the host's controllability, load adaptability, running stability and energy saving. The valve port independent control technology can control the pressure / flo...

AI Technical Summary

Problems solved by technology

[0006] The characteristics of the mechanical solid connection of the oil inlet and outlet of the traditional multi-way valve lead to the mutual influence of the flow control of the oil inlet and outlet of the actuator, especially in the case of negative load, the flow control cannot be realized, and at the same time, it will cause a waste of energy

The above CMA90 and CMA200 multi-way valves of Eaton Company, the A and B ports are controlled separately to realize the independent function of the valve port, but it is equipped with multiple temperature and pressure integrated sensors and displacement sensors, which are controlled by calculating flow and pressure control methods. The system is complex, and there are many parameters that affect the control accuracy, such as oil temperature, oil viscosity, etc., resulting in unstable control system

In addition, its oil port layout is different from that of traditional multi-way valves, and the cost of multiple sensors is high. Due to various factors, it cannot be used in large quantities.

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