Affiliations: [a] College of Mechanical Engineering, Taiyuan University
of Technology, Taiyuan, Shanxi, China | [b] Shanxi Key Laboratory of Fully Mechanized Coal Mining
Equipment, Taiyuan, Shanxi, China
Correspondence:
[*]
Corresponding author: Zisheng Lian, College of Mechanical
Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China.
Tel./Fax: +86 351 6018742; E-mail: lzsvip1959@163.com
Abstract: The large flow electro-hydraulic directional valves are the key
operating components for automation of the hydraulic roof supports in the coal
mine. Cracking is a common failure mode of the valve. Effects of the buffer
damp diameter, the valve type and the static pressure on the stress of the
valve were researched. The valve dynamic behavior was investigated by AMESim.
The transient collision stresses of the inlet valve sleeve of the main control
valve under different buffer damp diameters and different valve types were
investigated by ANSYS/LS-DYNA. The static stress analysis was conducted in
ANSYS too. Results show that the valve failure is due to the fatigue of the
inlet valve sleeve when suffered from the collision stress wave in the valve
opening process, rather than the lack of component strength. The buffer damp
diameter, the key parameter of the valve, has a significant effect on the
collision stress of the inlet valve sleeve. The integrated type valve has a
better stress state compared to the separated type valve. This paper provides
an effective method to solve the fracture problems of hydraulic directional
valves. It is also significant for the design and optimization of hydraulic
components.
