摘要:
A working machine (1) includes a prime mover (5) to produce power, a variable displacement hydraulic pump (P) to be actuated by power produced by the prime mover (5) to deliver hydraulic fluid, a hydraulic actuator (26) to be actuated by hydraulic fluid delivered by the hydraulic pump (P), a control valve (30) to adjust hydraulic fluid to actuate the hydraulic actuator (26), and a controller (11) configured or programmed to control the control valve (30). The controller (11) is configured or programmed to, based on an actual rotation speed of the prime mover (5), control the control valve (30) to limit a maximum flow rate (MF) of hydraulic fluid supplied from the control valve (30) to the hydraulic actuator (26) such that the maximum flow rate (MF) does not exceed a limit flow rate (LF), and the limit flow rate (LF) corresponding to a rotation speed (R) of the prime mover (5) is equal to or less than a maximum delivery flow rate of the hydraulic pump (P) corresponding to the rotation speed (R).
摘要:
Elektropneumatischer Stellungsregler für einen pneumatischen Stellantrieb zum Betätigen einer Stellarmatur, wie ein Stellventil, einer prozesstechnischer Anlage, umfassend wenigstens zwei modulare Pneumatiksteckplätze zur Belegung mit jeweils einer modularen Pneumatikkomponente, wie ein elektropneumatischen Wandler oder dergleichen, wobei die wenigstens zwei Pneumatiksteckplätze und die Pneumatikkomponenten derart modular aufeinander abgestimmt sind, dass deren pneumatische Schnittstellen bei Belegung eines Pneumatiksteckplatzes ineinander übergehen, und wenigstens einen pneumatischen Steuerausgang zum Ausgeben eines pneumatischen Stelldrucksignals an den Stellantrieb, wobei die wenigstens zwei modularen Pneumatiksteckplätze und der wenigstens eine pneumatischen Steuerausgang eine pneumatische Reihenschaltung bilden.
摘要:
Example embodiments may relate to a robotic system that includes a hydraulic actuator and an electric actuator both coupled to a joint of the robotic system. Operation of the actuators may be based on various factors such as based on desired joint parameters. For instance, such desired joint parameters may include a desired output torque/force of the joint, a desired output velocity of the joint, a desired acceleration of the joint, and/or a desired joint angle, among other possibilities. Given a model of power consumption as well as a model of the actuators, the robotic system may determine operating parameters such as hydraulic and electric operating parameters as well as power system parameters, among others. The robotic system may then control operation of the actuators, using the determined operating parameters, to obtain the desired joint parameters such that power dissipation in the system is minimized (i.e., maximizing actuation efficiency).
摘要:
Bei einem pneumatischen Antrieb zum Stellen einer Stellarmatur, insbesondere eines Stellventils, mit einer ersten Arbeitskammer, einer zweiten Arbeitskammer, insbesondere einer Rückstellkammer, wobei beide Kammern durch eine bewegliche Trennwand voneinander pneumatisch getrennt sind, an der die Stellarmatur stellkraftübertragend gekoppelt ist, und bei einer Druckdifferenz zwischen den Arbeitskammern die Trennwand in einer ersten Stellrichtung verlagert wird, und einem Stellungsregler, der zum Aufbau der Druckdifferenz wenigstens ein pneumatisches Stellsignal an die erste Arbeitskammer und gegebenenfalls an die zweite Arbeitskammer abgeben kann, ist vorgesehen, dass die erste und zweite Arbeitskammer durch eine pneumatische Kurzschlussleitung miteinander pneumatisch verbunden sind und in der Kurzschlussleitung ein Ausgleichsventil zum Schließen und/oder Öffnen der Kurzschlussleitung angeordnet ist, das derart durch den Stellungsregler ansteuerbar ist, dass im Falle einer bestimmten Betriebsituation, wie eines Stick-Slip-Zustands der Stellarmatur oder einer Überschreitung einer vorbestimmten pneumatischen Ist-Druckdifferenz zwischen der ersten und zweiten Arbeitskammer, das Ausgleichsventil die erste und zweite Arbeitskammer für einen Kammer-Druckausgleich pneumatisch kurzschließt.
摘要:
A method and apparatus for controlling a valve/actuator plant (17) by generating a plurality of independent correcting control signals each (15) responsive to a plurality of respective input signals and at least one of these input signals being the set point signal (54). The plurality of independent correcting control signals includes a pneumatic flow signal. The correcting control signals may be derived from all linear control signals, all non-linear control signals, or a combination of linear control signals and non-linear control signals.
摘要:
A fluid pressure apparatus capable of achieving stable pressing is obtained. The fluid pressure apparatus comprises a fluid pressure pump (1) driven by an electric motor (6) and rotatable in both directions. Both ports (14, 16) of a fluid pressure cylinder (12) are respectively connected to both ports (2, 4) of the fluid pressure pump (1) via a pair of flow paths (8, 10). A throttle (32) is disposed on a leak flow path (30) which communicates a high pressure side with a low pressure side of the pair of flow paths (8, 10), while the pressing operation is performed by a fluid pressure cylinder (12). Furthermore, the fluid pressure apparatus comprises a position control circuit (38) for controlling the electric motor (6) based on a position detected by a movement detection sensor (34) for detecting movement by the fluid pressure cylinder (12), a pressure control circuit (40) for controlling the electric motor (6) based on pressure in the flow path (10) on the high pressure side detected by the pressure sensor (36), and a switch circuit (42) for switching control by the poison control circuit (38) to control by the pressure control circuit (40).
摘要:
A double action oil hydraulic press is provided having a main cylinder (30) for actuating a slide (2) and a lower part forming cylinder (27) for actuating a lower part forming unit (12), wherein the operations of the cylinders are controlled through the combined control of the rotation of an oil hydraulic pump (52) of a power unit (31) and servo valves (34, 37) whereby the amount of operation oil that must be used is reduced. To this end, the press comprises a power unit (31) comprising a variable displacement oil hydraulic pump (52) adapted to be driven by an inverter motor (51); controllable servo valves (34, 37) provided in hydraulic circuits (33a, 33d) connecting the power unit (31) to the main cylinder (30) and to the lower part forming cylinder (27), respectively; servo controllers (41a, 41d) for controlling the servo valves (34, 37), respectively; cylinder pressure detecting sensors (39a, 39d) provided in the hydraulic circuits (33a, 33d), respectively; position detecting sensors (40a, 40b) for sensing positions of the slide (2) and the lower part forming unit (12), respectively; a control unit (32) for furnishing the inverter motor (51) of the power unit (31) and the servo controllers (41a, 41d) with control signals, respectively, and means whereby respective sensing signals of the cylinder pressure and position detecting sensors (39a, 39d, 40a, 40b) are fed back to the control unit (32).