Hydraulic control for machine tool - with 2 main hydraulic lines switched between feed and return functions

摘要

The hydraulic control allows selective direction control of a number of hydraulic drives (A) and has a pressure source and a reservoir, coupled to feed and return lines. These are provided by 2 main lines (H1, H2) with a reversible function determined via a common direction control valve (R), a further electromagneically operated 4/2-way blocking valve (15, 15', 15") inserted between the main lines (H1, H2) and each drive (A). Each of the latter valves (15, 15', 15") has a single switching magnet (M3, M4, M5) controlling 2 valve elements for a pair of parallel seating valves. ADVANTAGE - Improved control accuracy.