Controlling energy characteristics of power presses - with energy transfer from intensifier to crankshaft on downstroke and from ram to intensifier on upstroke

摘要

In a conventional power press drive energy is normally lost in the form of heat emitted by the clutch and brake during the press working cycle. The invention seeks to avoid this by the use of an intensifier consisting of a stepped piston (29) moving in cylinder (30) mounted on the press frame (32). Above the piston is air under pressure controlled by valve (31) and below it is oil which can flow back to the high pressure side of the intensifier. The rod (28) of the intensifier piston is connected by link (27) to freewheel (26) which drives the crankshaft when the rod moves downwards. Cylinders (19) fastened to the press frame on each side of the press ram have pistons (18) driven upwards by the ram and thus forcing oil from the upper chambers of the cylinders into the high pressure chamber (20) of the intensifier. At the start of the press cycle, energy stored in the intensifier is released to accelerate the crankshaft by means of the freewheel (26). On the upstroke energy is returned to the intensifier through the movement of pistons (18) attached to the press ram. USE/ADVANTAGE - Press with reduced wear of clutch and brake. More efficient energy usage. Reduced noise.