GB1181281A - Improvements in or relating to Multi-Stage Plate Presses, more particularly for the Manufacture of Chip Plates, Fibre Plates and the like - Google Patents

Abstract

1,181,281. Multi-daylight press; hydraulic presses. NIEDERRHEINISCHE MASCHINENFABRIK BECKER & VAN HULLEN. 17 May, 1967, No. 22826/67. Headings B5A and B5F. A multi-daylight press comprises upper and lower fixed plates 3 and 10, a movable press table 2, intermediate platens 1, and an hydraulic simultaneous closure device. The closure device consists of a control cylinder 6a fixed to the plate 10, the piston-rod 6 of which cylinder is fixed to table 2; a closing cylinder 7a, located in table 2, the piston-rod 7 of which cylinder is fixed to the lower of platens 1; and a similar cylinder 7a, located in said lower of the platens the piston-rod 7 of which cylinder is fixed to the upper of the platens 1. Fluid connections 8 are maintained between the various cylinders as shown in the Figures. In operation, starting from a position in which the plates, table and platens are all equally spaced, the table is raised to close the press and fluid is transferred from the upper of cylinders 7A to the space in cylinder 6a caused by the raising of rod 6 with the table. Piston 7 thus moves down relative to the cylinder 7A. This causes an equal amount of fluid to be transferred from the lower cylinder to the upper cylinder, this in turn causing the lower piston to move down relative to the lower cylinder. Since the cylinders 7a are of the same size and equal volumes are transferred, it can be seen that the amount of movement between the table and the lower platen is equal to that between the lower and upper platens and that between the upper platen and plate 3. Simultaneous closure is thus achieved.