Abstract:
The invention proposes to regulate the power of hydraulic shafts no longer at the hydraulic side, but rather at the electric side by means of power electronics. This allows the hydraulic equipment to be operated in an open circuit, and in particular to drive in sequence any number of shafts by means of a single pump. The big advantage is that a high regulation quality is achieved for shafts exclusively driven by electric engines and above all the suppression of energy losses that occur in the state of the art. This new drive is particularly advantageous when it is made to interact with a potentiel that defines the opposite-driving forces on the drive. A pump with an internal geared wheel is preferably used. Although the system as a whole is a four-quadrant drive, it works at the pump drive side as a two-quadrant drive. The invention allows the "control and regulation philosophy" known in the electric field, in particular for power control and regulation, to be applied in hydraulic drive technology.
Abstract:
The invention relates to an injection unit for injection molding machines, which comprises an electric motor for the controlled application of nozzles and displacement of the unit. Two parallel hydraulic cylinder are activated by an electromotive hydrostatic transmission associated with the two cylinders for the controlled application of nozzles and displacement of the unit. An accumulator, especially a low-pressure accumulator, remains permanently connected for the low-pressure side during operation.
Abstract:
The invention proposes reaching the upper stage of the compressed blowing air adiabatically instead of isothermically, as previously, so enabling the entire blowing process to be carried out with the smallest possible amount of energy, and the greatest possible amount of energy to be recovered via a piston pump (14), for example, after blow forming. Preferably, for a first phase, low-pressure blowing air (N) of between 8 and 12 bars is generated isothermically in one or two stages and then adiabatically generated high-pressure blowing air (H) of between 30 and 40 bars reaches the actual pressing stage. Energy can also be recovered electrically by the same means as are used for driving the piston pump (14). A highly significant portion of energy is saved as a result of the upper stage of the compressed air stage being reached adiabatically and provided with a compressed air cushion at the rear of the piston and an additional high-pressure reservoir. Optimum use is made of the dynamic cycle of advance and return movements of the piston. All the sequences are co-ordinated by a central control system (ST).
Abstract:
Die Antriebsanordnung (1) umfasst ein Lagergehäuse (5), in welchem zwei langsam laufende Elektromotoren untergebracht sind. Die Rotoren der Elektromotoren sind auf dem vorderen Verbindungsflansch (25) und dem hinteren Verbindungsflansch aufgesetzt und mit diesen drehfest verbunden. Zwischen dem vorderen Verbindungsflansch (25) und dem hinteren Verbindungsflansch ist ein Drucklager eingesetzt, welches die beiden drehenden Teile (Gewindetrieb 15 und Plastifizierschnecke 11) entkoppelt.
Abstract:
Die Erfindung betrifft ein Einspritzaggregat (1) mit einem Elektromotor (30) für die gesteuerte Düsenanpressung und Aggregatsverschiebung für Spritzgiessmaschinen, dabei werden zwei parallel angeordnete Hydrozylinder (11, 11‘) mittels eines den beiden Zylindern zugeordneten elektromotorisch angetriebene hydrostatischen Getriebes (27, 28, 60) für die gesteuerte Düsenanpressung und Aggregatsverschiebung aktivierbar, wobei für die Niederdruckseite im Arbeitsbetrieb ein Akku (26) insbesondere ein Niederdruck-Akku dauernd zugeschaltet bleibt.
Abstract:
Die neue Lösung betrifft eine Auswerfereinheit für das elektromotorische Ausstossen von Spritzgiessteilen aus Spritzgiessformen. Es wird dafür das Zwischenschalten eines Ovalgetriebes vorgeschlagen. Das Ovalgetriebe kann ausserhalb der Antriebsmittel für die bewegliche Form angeordnet werden. Dies gibt mehr Freiraum in dem zentralen Bereich der beweglichen Form für eine bessere Nutzung durch dessen Antriebsmittel. Das Ovalgetriebe hat eine sehr ähnliche Übersetzungseigenschaft wie eine Kurbel, jedoch mit genauer Begrenzung der Kraft an der Abtriebswelle. Damit können die Vorteile eines Kurbelantriebes für die Auswerfereinheit genutzt werden, mit einer grösseren Platzersparnis in dem kostbaren Zentralbereich der Antriebsseite der beweglichen Form.
Abstract:
So far, a mechanical spring has been fitted to cushion the application of the nozzle (1) against the mould in an electric injection moulding machine. The invention proposes to do away with said spring. The nozzle (1) is clamped between the fixed mould (10) and the injection unit (4) by the electric motor drive via two tension rods or columns (9). The nozzle (1) is first smoothly taken to the application position, for example via a braking ramp, whereafter the nozzle pressure force if set depending on the injection force via suitable controls. This provides a constant balance between application force and opening force from the pressure with a selectable pre-stress. The drive motor power consumption is reduced. The adjustment comlexity is substantially reduced with a special structural arrangement.
Abstract:
According to the invention the linear displacement of the injection screw (10) in injection molding machines with an electric drive (1) is controlled. The set position or speed of the servomotor (1) is controlled or regulated according to predetermined prescriptions. Instead of the state-of-the-art torque regulation, a sufficient torque reserve is ensured. All low-frequency vibrations of the system caused by the elastic behaviour of the liquid plastic mass are completely eliminated and the injection parameters are mastered to a much greater extent, so that parts having extremely thin walls may be highly accurately produced. The setting signal is not linearly calculated but preferably as a root-like function of the deviation between real and set values. A new type of multiple drive for at least two, in particular three or more axles is disclosed with a corresponding number of drive controllers, a data transmission system and a computer. The process is defined in the computer and corresponding set values are predetermined. Said set values are transmitted by the data transmission system to a prescription storage of an intelligent drive which controls and/or regulates several axles in a coordinated manner.