EP 0029223 B1 19831123 - HYDRAULIC SERVICE SYSTEM FOR A PULSATING PRESS
Title (en)
HYDRAULIC SERVICE SYSTEM FOR A PULSATING PRESS
Publication
Application
Priority
PL 21967279 A 19791115
Abstract (en)
[origin: EP0029223A2] 1. A hydraulic supply system for at least one differential-area (Vp , Vn ) piston of a hydraulic control motor (16) of a pulsation press, in which one pump, which is connected to a relief valve and the pressure line of which is controlled by a directional slide valve, is provided for each piston drive, a pulsator (20) being arranged which conveys oil as a pulsating stream into the same operating chamber (Vn ) of each piston of the hydraulic control motor (16) as the pump and a pressure accumulator additionally being connected for the return of each piston of the control motor (16) in the pressure chamber (Vp ), characterized in that the differential-area (Vp , Vn ) piston of the control motor (16) in addition comprises on one side two axially offset pressure chambers (Vn , Vw ) of differing sizes ; in that the pump (4) acts on the larger pressure chamber (Vn ) of the control motor (16), whereas a further pump (5) acts on the smaller pressure chamber (Vw ) of the sampe piston of the control motor (16) with the interposition of a pulsator constructed as a rotary distributor (20) ; in that the two pumps (4, 5) are each protected by means of a nonreturn valve (8, 9) and the pressure lines thereof are each connected to a pressure accumulator (14, 15) ; and in that the directional slide valve (17), in one of its operating positions, conveys the oil to a chamber (Vp ) on the other side of the piston of the control motor, the second operating chamber (Vw ) being simultaneously connected to the exhaust by a further slide valve (24), whilst the pressure value in the chamber (Vp ) on the other side of the piston above the piston is limited by means of a relief valve (25).
IPC 1-7
IPC 8 full level
F15B 21/12 (2006.01); B21J 9/12 (2006.01); B21J 9/06 (2006.01)
CPC (source: EP)
B21J 9/12 (2013.01)
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
EP 0029223 A2 19810527; EP 0029223 A3 19811028; EP 0029223 B1 19831123; BG 41652 A3 19870715; DD 154345 A5 19820317; DE 3065716 D1 19831229; HU 182236 B 19831228; PL 126538 B1 19830831; PL 219672 A1 19810619; RO 81558 A 19830429; RO 81558 B 19830430; SU 1050583 A3 19831023
DOCDB simple family (application)
EP 80107012 A 19801113; BG 4966380 A 19801114; DD 22521180 A 19801114; DE 3065716 T 19801113; HU 273080 A 19801114; PL 21967279 A 19791115; RO 10259380 A 19801114; SU 3003442 A 19801113