| 摘要 |
<p>Mounting and demounting of sheet convertors or bases takes place by means of a vertically movable support platform and has upper and lower frame members, the lower being connected to primary hydraulic cylinder, and between the members a circle of secondary hydraulic cylinders are disposed. The pressure chambers of the primary and secondary cylinders communicate via a conduit having in parallel a two-way and a non-return valve. The ratio of the pressure surface of the primary cylinder and the sum of the pressure surfaces of the secondary cylinders is greater than that of the total charge resting on the primary cylinder and the total charge resting on the secondary cylinders, and the primary cylinder always acts before the secondary cylinders.</p> |
