| 摘要 |
The invention relates to a hydraulic high-speed lifting press of the framework type having a pressing table, a crosshead and a pressing ram, which is movable therebetween, for moulding, coating and pressing parts which cover a large area, have thin walls and are made of plastic or plastic compounds, or fibre-reinforced plastic mats to make moulded parts, having a pressing ram which supports the upper mould half and can be raised and lowered together with a hydraulic high-speed device for the return stroke and a hydraulic short-stroke device for the working stroke. The high-speed lifting press is characterised by the fact that the pressing ram (6) can be raised and lowered in the return stroke by means of a hydraulic high-speed travelling mechanism (9 and 10) and is guided by means of pressing rods (5), the pressing rods (5) can be coupled via one hydraulic collet locking system (3, 7 and 13) each to the annular pistons (2) of differential cylinders (4) in a travel-synchronised and non-positive manner and the working stroke is executed by means of differential cylinders (4) on the annular pistons (2) and on the pressing rods (5), the annular pistons (2) being preloaded under hydraulic counterpressure with respect to the differential cylinder (4) before locking. <IMAGE> |
