FLUID CONTROL SYSTEM FOR SELECTIVELY SELF-ADJUSTING MILL REDUCTION FORCE OR INTERWORKING ROLL DISTANCE

摘要

A fluid control system for selectively self-adjusting mill reduction force or inter-working roll distance or roll gap comprising a variable discharging plunger pump having one port connected to a hydraulic cylinder adapted to apply pressure on working rolls in a mill and the other port connected to a fluid supply source. A servo valve is provided for deflecting deflection means in one or the other direction to control the discharge direction and discharge amount of said pump. In order to detect an existing value of mill reduction force, a fluid pressure detector is provided for electrically detecting fluid pressure in a fluid passage adapted to be connected to said hydraulic cylinder. A detector is provided for producing an electrical signal in response to the position of the ram of the cylinder. The servo valve operates in response to a result of a comparison between signals from the above-mentioned detectors and a reference value and thereby fluid is controlled so that the fluid may be in a predetermined direction and a predetermined amount so as to self-adjust mill reduction force or inter-working roll distance.