Controlling energy characteristics of power press - by energy transfer between main crankshaft and second crankshaft connected to air-hydraulic intensifier

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. A second crankshaft (9) is coupled to the first crankshaft (6) through a clutch (20) and has an eccentric connected to the rod (10) of a stepped piston (11) moving in a cylinder (12) trunnion mounted on the press frame. Above the piston is air under pressure controlled by valve (13) and below it is oil which can m be switched past check valve (18) under control of valve (19). The cylinder (12) constitutes a pressure intensifier and potential energy storage device. Under control of valves (19) and clutch (20) it applies an accelerating torque at the start of the press cycle and a decelerating torque towards the end of the cycle. USE/ADVANTAGE - Power press with reduced wear of clutch and brake. More efficient energy usage.