Hydraulically moved control devices of the lower pressing plungers in moulds for tiles and the like objects in ceramic

摘要

In a compression-moulding machine, for moulding tiles &c., from ceramic material, bottom ejecting plungers 32, carried by plate 31, are actuated through shaft 26, by upper and lower hydraulic jacks, the pistons 9 and 7 of which are connected by rod 11. The cylinder 8 of the upper jack is carried by a spring- biased transverse member 21 movable along columns 2 depending from the fixed ground plate 1 of the press, and the cylinder 6 of the lower jack is seated in a fixed transverse member 4. In operation, starting from the position shown in the diagram in which an article has been moulded, the lower jack is actuated to raise piston 7, the piston moving until it abuts a vertically adjustable sleeve 14. The cylinder 8, and thus the ejecting plungers, are raised during this motion by a distance equal to the stroke of piston 7 minus the initial clearance between cylinder 8 and piston 9 i.e.h. The upper jack is then actuated to further raise piston 8 until crown wheel 37 mounted upon shaft 26 abuts crown wheel 43 mounted below plate 1, the moulded article then being completely ejected. The lower jack is then released and member 21 is forced down by springs 24 until piston 7 abuts cylinder 6, the plungers being lowered by a corresponding amount to facilitate filling of the moulds 33 with working material. The upper jack is then released and the member 21, cylinder 8, and plungers 32 move down further relative to the piston 9, the movement being stopped when plate 31 abuts a stop plate 34. The members are then as shown in the drawing and the press is actuated to compress the working material.