Endless screw of a centrifuge with ceramic wear plates

#The invention relates to an endless screw of a centrifuge for discharging centrifuged material from a centrifuge, wherein a series of thin ceramic plates are fastened next to one another on the outer edge of the endless screw.

#In the case of endless screws of centrifuges, the outer edge of the endless screw walls is subjected to a particular amount of stress during the conveying and also the slowing down of the product. In order to extend the service life, it is known to fasten thin ceramic plates next to one another on the outer edge of the endless screw. It has been shown in this case that production and fastening of the thin ceramic plates are complicated and technically problematic.

#It is the object of the invention to improve an endless screw of a centrifuge of the type mentioned at the beginning in such a manner that, while production and fastening are simple, the thin ceramic plates are securely held even when subjected to a high amount of stress.

#In the drawings

#FIGS. 1 to 6 show perspectively illustrated cutouts of the outer edge of an endless screw of a centrifuge with thin ceramic plates fastened on one side;

#FIGS. 7 and 8 show perspective illustrations of thin ceramic plates fastened on both sides of the centrifuge edge;

#In the embodiment illustrated in FIGS. 1 to 6, the helix of an endless screw of a centrifuge 1 has an outer edge 2 on which outwardly protruding, rectangular, in particular thin-plate-like supporting parts 3, preferably made from precision casting, are fastened, in particular welded. In this case, the endless screw of a centrifuge 1 and the helix thereof are preferably composed of steel.

#The supporting parts 3 which protrude radially outward each have two bores as recesses 4 which are arranged radially one above the other. Elongate, rectangular thin ceramic plates 5 are fastened to the supporting parts 3 and cover the supporting parts. Projecting, pin-shaped projections 6 are arranged and integrally formed radially one above another on the thin ceramic plates 5, the size and dimensions of which projections correspond to those of the recesses 4, and therefore the thin ceramic plates 5 can be fastened laterally to the supporting parts 3 in a form-fitting manner.

#The supporting parts 3 each form a step 3b in the region of their foot, and therefore the foot 3a which is fastened to the outer edge 2 has a greater thickness D than the thickness of the adjoining outer region of the supporting part 3. Said step 3b is covered by a step 6b of the thin plate 5, with the thin ceramic plates forming, adjacent to the step 6a, a projecting surface 7 which projects toward the axis of the endless screw and projects toward the axis to such an extent that it projects over the endless screw surface or the helical surface and therefore also the outer edge 2 in order to protect said region optimally against wear.