Two-platen machines of the Jupiter/j series
Two-Platen Machine with an Energy-Saving Drive
Chinese injection molding machine manufacturer, Haitian Plastics Machinery, is launching the pan-European marketing of its Jupiter/j series with clamping forces of between 12,000 and 60,000 kN. The j symbolizes the dynamic servodrive, which is already in use on the Mars series. The CE-certified, two-platen machines, in which the company has used nine of its own patents, offer a generously-dimensioned mold installation space as well as extra long opening displacements – and hence greater freedom and flexibility in the production of very big moldings. The locking system ensures particularly reliable movements, through four mechanical locks that operate independently of each other, and additionally permits the installation of different-height molds. The revamped tie-bar guide system for the moving platen is also an innovation. This stabilizes the operation of the machine, on the one hand, and compensates for any unevenness in the production shop floor, on the other hand.
According to the manufacturers, the Jupiter/j series – like the Mars series (600 to 40,000 kN) – achieves energy savings of up to 80% compared with machines that have a fixed pump , since the servodrive only runs while the machine is moving. During the cooling and holding pressure phase, it is switched off completely. The centerpiece of this technology is the interplay between a noise-reduced, closed hydraulic control loop, which uses less cooling water, and the servodrive, which permits a variable motor speed of between 0 and 2,000 rpm. With this closed-loop concept, the motor speed is transmitted by a rotating encoder to an inverter control system, while, at the hydraulic level, a sensor simultaneously sends the pressure data required for synchronization to the inverter. The inverter control (K.E.B. F5 Series) efficiently governs the control loop on the basis of these values. The pump system, which is driven by a cog wheel, offers a precision linear flow control without hysteresis, as well as optimum control at very high and very low speeds, and has the same performance characteristics as an asynchronous motor – albeit with higher acceleration values (0.05 s for 0 to 2,000 rpm). A standard feature on the Jupiter/j series is the new Type 4030 control generation (manufacturer: Keba AG).
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