Two-dimensional Electro-hydraulic Proportional Directional Valve#br#

doi:10.3901/JME.2016.02.202

Abstract

Abstract: The 2D electro-hydraulic proportional directional valve is composed of 2D directional valve(flow valve), compression-torsion coupling and proportional electromagnet. Under the normal working pressure, the magnetic force of the proportional solenoid rotates the spool through the compression-torsion coupling and induces the pressure of the sensitive chamber on the two sides to vary differentially. Consequently, the spool axially slides under the hydrostatic imbalanced force. As the spool moves forward, it rotates inversely and the pressure of the sensitive chamber recovers and returns to its previous value. In this process, the spool arrives at a new axial position and the proportional control to the valve openings is achieved. While the working pressure of the system is zero, the spool is proportionally driven by the magnetic force directly. Thus, the 2D electro-hydraulic proportional directional valve can function both as a pilot directional valve or direct actuated valve. The compression-torsion coupling is used to realize motion conversion and amplify the thrust force of proportional electromagnet, therefore the unfavorable influence of friction force between spool and valve sleeve on proportional characteristics can be effectively overcome. Simulation analysis clarifies the effects of the key structural geometric parameters on the characteristics of the 2D valve. Moreover, the criteria of the 2D valve is also established by the utilization of the linear theory. Experiments are also carried out by measuring the characteristic curves under direct and pilot operation states. By comparing the characteristics under these two operation state, it is concluded the 2D valve has a fairly fast responding speed and the good stability.

Key words: 2D valve, directional valve, electro-hydraulic proportional control, stability analysis

CLC Number:

TH137

LI Sheng, RUAN Jian, MENG Bin. Two-dimensional Electro-hydraulic Proportional Directional Valve#br#[J]. Journal of Mechanical Engineering, 2016, 52(2): 202-212.

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