Electrohydraulic monitoring device for a dual effect hydraulic cylinder

   
   

The invention relates to an electrohydraulic monitoring device for a dual effect hydraulic cylinder in which certain operating pressures must be maintained. A pressure reduction valve is provided for setting said pressures, this pressure reduction valve being used to set a defined pressure (41) by adjusting the pretension of the valve spring (41). The valve spring is situated in a spring chamber (137) which is bordered by a regulating sleeve (46) on one side, in an axially moveable manner. Said regulating sleeve is displaceable between two end positions within a limited axial stroke area. The alternative switching positions of a micro-switch (117) are linked to these end positions. Two sensor chambers, each of which is connected to one of the pressure chambers of the cylinder in such a way that they communicate, are provided and are delimited by sensor pistons (106, 107) in order to determine the operating pressure that is being coupled into the hydraulic cylinder at a particular time. The alternative subjection to pressure and relief from said pressure of these sensor chambers forces the regulating sleeve into the same end position, respectively.

 
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