GB803049A - Improvements in or relating to gyratory crushers - Google Patents

Abstract

803,049. Gyratory crushers. NORDBERG MANUFACTURING CO. July 19, 1957 [July 27, 1956; May 8, 1957], No. 22939/57. Class 59 In a gyratory crusher comprising a pair of crushing members at least one of which has a liner providing a space between the crushing member and the liner for receiving a fluid backing material, e.g. molten zinc, means are provided near the upper end of the space for controlling the overflow of excess backing material and preventing it from reaching parts of the crusher which could be harmed or be rendered inoperative by contact with the material. As shown, a mantle 26 is provided adjacent its upper edge with at least two holes 34 which provide access to the space between the mantle and a crushing head 22 for pouring backing material 28 and determine the level 36 of the backing material. The level of the holes 34 is such as to prevent the backing material from reaching the screwthreads 24 between a nut 32 and the mainshaft 20. The mantle is engaged at its upper end by an extension 30, and a washer 42 is disposed between a ground surface 40 on the extension 30 and the lower edge of the nut 32. To protect the washer 42 from abrasion, a rib 44 is provided on the mantle extension 30 to form an annular trough 46. A feed plate 50 is protected from abrasion by means of a peripheral wall 52. To prevent relative rotation between the mantle 26 and the mantle extension 30, which is interlocked with the nut 32, a lug 56 on the mantle engages a corresponding lug 54 on the mantle extension. The space between the bowl 14 and its liner 18 is filled with backing material 72 which is poured in from above. The bowl has screwed thereto a tightening ring 70 which has an integral diagonal portion 74 provided with spaced lugs 76 on which rest, when the ring 70 is tightened, spaced lugs 78 provided at the upper end of the liner 18, the spaces formed between the lugs serving as overflow channels for the backing material. A feed cone 82, 84 rests on the upper end of the liner 18. Various modifications are described in which (a) the holes or notches provided adjacent the upper edge of the mantle are substantially inclined to the vertical, (b) the lower edge of the feed cone is provided with notches interlocking with lugs at the upper edge of the bowl liner, (c) the lower edge of the tightening ring is horizontal, (d) an adapter ring is provided for backing the mantle extension, (e) an adapter ring is provided between the bowl and its tightening ring, or (f) the mantle comprises albutting upper and lower portions, the cross-section of which at the abutting edges is of fluctuating formation so that they are locked together by the backing material.