Abstract:
The invention relates to a regulation method for the hydraulic support of an electric drive. The force of an electric motor whose rotational movement is translated into a longitudinal movement via a transmission and the force of a piston of a hydraulic cylinder act upon an axially displaceable machine part in the longitudinal direction. The force exercised by the hydraulic motor is limited to a value at which the transmission is not yet damaged. In order to limit the force component supplied by the electric motor, a regulation difference is established from the desired value for the force acting upon the machine part in the axial direction and the actual value of said force. Said difference controls the sum of the force components acting upon the machine part in the axial direction. A desired value for the force acting upon the piston in the axial direction is established from the actual value of the force acting upon the machine part in the axial direction and a value that takes the mechanical stability of the transmission into account. A regulation difference is established from the desired value for the force acting upon the piston in the axial direction and its actual value. Said difference controls one of the force components acting upon the machine part in the axial direction.
Abstract:
Die Spule einer Magnetspulenanordnung weist einen Spulenkörper auf, der mit einer Wicklung (14) versehen und mit Kunststoff (17) umspritzt. An die Spule ist ein mit Kontaktfahnen versehener Stecksockel angeformt, von denen eine für den Anschluß des Schutzleiters (18) vorgesehen ist. Über die spule ist ein Metallgehäuse (12) geschoben. Die Verbindung des Metallgehäuse mit der dem Schutzleiteranschluß zugeordneten Kontaktfahne erfolgt über ein Verbindungselement, das durch eine Aussparung des Stecksockels geführt ist. Zwischen dem Verbindungselement und der Aussparung ist ein Dichtelement (42) angeordnet, das ein Eindringen von Flüssigkeit aus dem Bereich zwischen dem Metallgehäuse und der Spule in den Bereich verhindert, in dem ein Stecker an die Kontaktfahnen angeschlossen ist. Um die elektrische Verbindung zwischen der dem Schutzleiteranschluß zugeordneten Kontaktfahne und dem Metallgehäuse bei einem in das Metallgehäuse geschraubten Verbindungselement (31) zu verbessern, ist zwischen der Kontaktfahne und dem Metallgehäuse ein rohrförmiges Metallteil (36) angeordnet. Zwischen dem Verbindungselement und dem rohrförmigen Metallteil sowie zwischen diesem und der Aussparung in dem Stecksockel ist jeweils ein Dichtelement (41, 42) angeordnet. Derartig Magnetspulenanordnungen werden für elektromagnetisch gesteuerte hydraulische Ventile verwendet, bei denen von außen zugängliche Metallteile mit einem Schutzleiteranschluß zu verbinden sind.
Abstract:
The invention relates to a working cylinder actuated by hydraulic fluid, comprising a piston (20) to which a piston rod (35) is fixed and which can be axially displaced in a cylinder chamber between two end positions such that it inversely modifies the volume of two cylinder chambers (21, 22) on either side. A damping element (40) is arranged at least at one side of the piston (5) which when the piston moves into one of the terminal positions enters an opening between the one cylinder chamber and a cylinder connection, such that together with said opening it forms a circular throttling gap for the throttled outflow of hydraulic fluid from the cylinder chamber to the cylinder connection. To obtain a high damping capacity and in this way to be able to slow down large masses moved by the cylinder along a defined path, the outer surface of the damping element (40) in the axial direction is shaped such that when the damping element is fully immersed, it has a maximum diameter at the chamber-side start of the opening and, following a flat section having a small diameter (52) or small diameters, if the damping element is deeply immersed, across a short section has a medium diameter situated between the maximum and the small diameter.
Abstract:
The invention relates to a hydraulic control arrangement for the demand-feed regulated hydraulic fluid supply of preferably several hydraulic consumers which are provided with proportionally adjustable directional control valves (12). A required amount of hydraulic fluid can be delivered by two hydraulic pumps (30, 31) via a common supply line leading to the directional control valves. A first demand-feed regulator (45) is associated with the first hydraulic pump (30) and a second demand-feed regulator (46) is associated with the second hydraulic pump (31). A return valve (36) which opens into the feed line is mounted between the first hydraulic pump (30) and the feed line (26). According to the invention, a return valve (37) that opens into the feed line (26) is also arranged between the second hydraulic pump (31) and the feed line (26). Means (90, 91, 95, 96) for regulating the power use of the demand-feed regulator (45, 46) are provided, whereby said means can be modified in such a way that the hydraulic consumers can be exclusively supplied with hydraulic fluid by the first hydraulic pump (30) or the second hydraulic pump (31).
Abstract:
The invention concerns an adaptation algorithm for a controller which is monitored by a higher-level measuring loop. The control deviation xw.k is filtered through a noise filter in the measured value detection loop, the filtering factor of said noise filter being varied as a function of the control result and noise level of the measured values. The measuring loop contains a signal filter controlled by the quality of the measured values. The measuring clock sequence with which the controller will be initiated is selected as a function of the measured value quality and control result. The adaptation algorithm is provided in particular for digital controllers.
Abstract:
Die Erfindung geht aus von einem hydraulischen Pumpenaggregat mit einer hydrostatischen Systempumpe, von der über einen Druckanschluß ein hydraulisches Arbeitssystem mit Druckflüssigkeit versorgbar ist, mit einer zweiten Pumpe, von der Druckflüssigkeit über eine Einlaßöffnung ansaugbar und einem Niederdruckbereich der Systempumpe zuführbar ist, und mit einem einen Gehäusemantel aufweisenden Elektromotor, von dem die beiden Pumpen gemeinsam antreibbar sind. Der Erfindung liegt die Aufgabe zugrunde, ein hydraulisches Pumpenaggreat zu schaffen, das es erlaubt die Leistungsverluste im Arbeitssystem gering zu halten und das einen Dauerbetrieb ermöglicht, ohne daß die Temperatur der Druckflüssigkeit auf Werte ansteigt, die erhöhte Leckage und eine rasche Alterung der Druckflüssigkeit verursachen. Dies wird dadurch erreicht, daß die Systempumpe eine insbesondere druckgeregelte Verstellpumpe ist und daß von der zweiten Pumpe Druckflüssigkeit unter Umgehung der Systempumpe im Umlauf von der Einlaßöffnung über einen Kühlkreislauf in eine Rücklauföffnung förderbar ist.
Abstract:
Es wird eine elektrimechanische Spannvorrichtung mit hydraulischer Unterstützung beschrieben. Ein von einem Elektromotor angetriebenes Schubgetriebe, verschiebt zwei Spannbacken entlang einer Führungseinrichtung gegeneinander. Die eine Spannbacke ist in zwei gegeneinander verschiebbare Teilbacken geteilt. Zwischen den Teilbacken ist eine Kammer für die Aufnahme von Druckmittel gebildet. Die erste Teilbacke ist entlang der Führungseinrichtung verschiebbar und gegenüber dieser verriegelbar. Eine Teilbacke ist mit einem ersten Zylinder versehen, der mit dem Antrieb des Schubgetriebes gekoppelt ist. Zum Schliessen der Spannvorrichtung zieht das Schubgetriebe in einem ersten Schritt die Teilbacken gegen die andere Spannbacke, in einem zweiten Schritt fördert das Schubgetriebe bei gegenüber der Führungseinrichtung verriegelter erster Teilbacke Druckmittel aus dem ersten Zylinder in die Kammer zwischen den beiden Teilbacken. Zum Öffnen der Spannvorrichtung zieht ein zweiter, zwischen den beiden Teilbacken angeordneter Zylinder in einem ersten Schritt bei gegenüber der Führungseinrichtung verriegelter erster Teilbacke die Teilbacken gegeneinander, danach drückt das Schubgetriebe in einem zweiten Schritt bei von der Führungseinrichtung entriegelter erster Teilbacke die mit ihm gekoppelte Teilbacke unter Mitnahme der anderen Teilbacke in Öffnungsrichtung. Doe Spannvorrichtung ist für Fertigungsmaschinen, insbesondere für Spritzgiessmaschinen, vorgesehen.
Abstract:
The invention relates to a manually operated electric control device (13) which is particularly useful for electrohydraulic adjustment of hydrovalves or hydroengines. Said control device comprises a housing (10), a control lever which is accommodated in said housing and which can pivot around a pivoting point (18) in all directions starting from a neutral position, and a readjusting element (30) which is arranged on the control lever in such a way that it can move lengthwise. Said readjusting element rests on a connecting member (12) owing to the effect of a readjusting spring (31) which is clamped between said readjusting element and the control lever. The connecting member is firmly connected to the housing and is configured in such a way that the readjusting element is shifted, whereby the readjusting spring is pre-stressed to a greater extend when the control lever pivots about an axis as a result of a force exerted from outside, whereby said axis is located on one of the two main pivoting planes. According to the invention, the connecting member represents parts of the rotational body on both sides of said main pivoting plane. The axis of said rotational body corresponds to the second pivoting axis. The control lever pivots about an axis which is located on the other main pivoting plane but does not automatically return to its original position. A control signal is generated by the control lever, pivoting about an axis which is located on the other main pivoting plane. Said signal is maintained even when no outer force is exerted on the handle (20) of the control lever.
Abstract:
The invention concerns a hydraulic control circuit in which the pressure medium conveyed by a hydraulic pump of variable delivery (10) is fed, in each case via a metering aperture (17, 31), as a priority to a first hydraulic consumer (14) and only secondly to a second hydraulic consumer (15). It is already prior art to provide a priority valve (45) which comprises a first connection (46) connected to a line section (13) upstream of the metering aperture (17) of the priority hydraulic consumer (14) and a second connection (47) which is connected to the load-indicating line and whose valve member (48) can be acted upon in the opening direction of the connection between the first connection (46) and the second connection (47) by the load pressure of the priority hydraulic consumer (14) and an additional force (51). According to the invention, a priority control system is now produced without additional delivery losses and with sufficient amounts of pressure medium being conveyed in that the valve member (48) of the priority valve (45) can be acted upon in the closure direction of the connection between the first connection (46) and the second connection (47) by a pressure prevailing in a line section (13) upstream of the first metering aperture (17).
Abstract:
The invention concerns a secondary-control hydraulic drive system for lifts, wherein a hydrostatic unit driven by an electric motor feeds pressure medium into an operating pressure line (8) in which an applied pressure, if possible a constant pressure, is maintained. One or a plurality of hydrostatic lift cage driving motors (1), designed as hydrostatic units with lifting displacement, is/are connected to the operating pressure network. If these driving motors operate as pumps driven from the lift cage, flow medium is drawn out of a low-pressure line (12) and conveyed into the operating pressure network. Since sufficient flow medium for the pumping operation of the driving motors is always available owing to the preloaded pressure in the low-pressure line, the assembly can be set up in the cellar of a building in order to generate and maintain the high operating pressure whilst the driving motors can be installed at a separate location. This would be impossible if the driving motors were connected in the conventional manner to a tank pipe or a reservoir, since in that case no flow medium could be drawn out of a lower lying tank line during a pumping operation.