EP 0107959 A2 19840509 - Electrohydraulic drive for process line winders, unwinders and other equipment.
Title (en)
Electrohydraulic drive for process line winders, unwinders and other equipment.
Title (de)
Elektrohydraulischer Antrieb für Wickel- und Abwickelvorrichtungen und andere Einrichtungen in Fertigungsstrassen.
Title (fr)
Entraînement électro-hydraulique pour bobinoirs, dérouleurs et autres arrangements équipant des chaînes de production.
Publication
Application
Priority
US 43597582 A 19821022
Abstract (en)
An electrohydraulic drive for process line equipment, especially a spooler that winds and pays out an indefinite length of metallic strand, varies the output torque of a hydraulic motor by controlling its displacement and the pressure differential between its inlet and outlet. A valve controlled by a proportional actuator reduces the supply pressure of the hydraulic fluid in a feed line for the motor. A sequence valve located in a return line from the motor maintains the pressure at the motor outlet at a preselected and adjustable value. During braking, fluid from the return line is directed to a regeneration circuit that includes a flow divider. A portion of the flow is returned to the feed line to conserve the fluid flow. Another portion is returned to a supply reservoir for cooling. A servo-amplifier circuit includes an integrating amplifier that compares the actual rotation speed of the motor to a speed command signal. An analog multiplier produces a control signal for the proportional actuator that is the scale product of the output signal of the "speed" amplifier and a pressure limit signal. In the preferred form a tensiometer monitors strand tension and produces an input signal to a computer that modifies the pressure limit signals. The computer interfaces with other input and output devices and also controls the speed command and displacement of the motor. An hydraulic cylinder controls the linear traversing movement of the spooler under the control of a high speed servo valve that in turn is controlled by electronic circuitry. Position, velocity and rotation speed transducers for the spooler and a position transducer for the strand provide input signals to the circuitry.
IPC 1-7
IPC 8 full level
B21C 47/02 (2006.01); B65H 23/195 (2006.01); B65H 59/38 (2006.01); F15B 11/028 (2006.01); G05B 11/32 (2006.01)
CPC (source: EP)
B21C 47/02 (2013.01); B65H 23/1955 (2013.01); B65H 59/38 (2013.01)
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI LU NL SE
DOCDB simple family (publication)
EP 0188035 A2 19860723; EP 0188035 A3 19861210; AU 2049383 A 19840503; BR 8305796 A 19840529; CA 1199704 A 19860121; DK 485883 A 19840423; DK 485883 D0 19831022; EP 0107959 A2 19840509; EP 0107959 A3 19840711; ES 526678 A0 19850101; ES 8502403 A1 19850101; FI 833436 A0 19830926; FI 833436 A 19840423; JP H0371346 B2 19911112; JP S5997971 A 19840606; ZA 837137 B 19840627
DOCDB simple family (application)
EP 85202147 A 19831021; AU 2049383 A 19831021; BR 8305796 A 19831020; CA 439172 A 19831018; DK 485883 A 19831022; EP 83306411 A 19831021; ES 526678 A 19831021; FI 833436 A 19830926; JP 19356183 A 19831018; ZA 837137 A 19830926