Thermal contraction control apparatus for hydraulic cylinders

Details Thermal contraction control apparatus for hydraulic cylinders Thermal contraction control apparatus for hydraulic cylinders

F - Mech Eng,Light,Heat,Weapons

15

B

F15B 21/00 (2006.01) B66C 13/20 (2006.01) B66F 9/22 (2006.01) F15B 11/028 (2006.01) F15B 21/04 (2006.01)

Patent

CA 2419734

A method and apparatus for operating a load lifting device to move a load and hold the load steady is disclosed. In the conventional arts, a lifted or lowered suspended load had a tendency to move from its desired position, as hydraulic fluid in the lifting system cooled, e.g. a stick slip condition. The present invention monitors a fluid pressure in the lifting system and compensates the fluid pressure to accommodate any pressure drop due to fluid cooling. Thereby, the load can be effectively held steady at a desired position, and the stick slip condition can be avoided.

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