Patent GB-1299462-A (GB)
Title: Material handling and treating system
IPC: B24B31/06
Filed: 1970-05-18
Abstract: 1299462 Abrading SWECO Inc 18 May 1970 [19 May 1969] 23869/70 Heading B3D [Also in Divisions B2 and B8] A material handling system for a mill 10, Fig. 1, having a chamber 11 for receiving material to be operated upon comprises a hoist pan 12 which receives and discharges a load of material into the chamber and has a housing 101, Fig. 4a, and a movable bottom 100 which may be opened upon the application of a predetermined force to the bottom to discharge the material into the chamber, and a crane 14 for supporting and moving the hoist pan to a position above the mill for discharge of material into the chamber and for moving the hoist pan to a position 20 near the mill for receiving material discharged from the mill, the crane having a stabilizer arm 13, one end of which is coupled with a support member 32 and the other end of which receives and holds the hoist pan. The mill may be of the finishing or grinding type, and as described, is a vibratory, finishing mill having an annular chamber 11. The base 25 of the mill is fixed to a vertical pivot 31 for the support member which carries an arm 33 for a hoist 34 having a chain secured to a bracket 38 on the end of the stabilizing arm 13, the latter being guided by rollers 92, 93 for vertical movement along the support member. A slot 39 is formed in the base of the bracket for supporting the hoist pan, the bottom of which, when the pan is lowered, may engage a projection 28 on the mill so as to open and deposit material into the mill. The hoist pan can then be moved to the position 20, shown dotted, for receiving the material discharged from a shoot 19 after treatment in the mill and discharge through an outlet 15 on to a vibrating screen separator 16 having a moving belt magnetic separator 17 for metal workpieces. In the position 20, the hoist pan is rotated so that the material received is evenly distributed therein, the rotation being effected by a magnetic roller 62 which is driven by a chain drive from a motor and spring urged against the periphery of the hoist pan. The hoist pan 10, Fig. 4a, comprises a cylindrical housing 101 formed with a lower flange 102 and frusto-conical insert 103. Rods 105 support a central cone 104 which rotatably supports a hook for engagement with the bracket 38 of the stabilizing arm 13. A pair of semicircular segments 107, 108 are carried by a pivot 109 passing through the cone and are releasably retained in a closed position by latches 112 mounted on pivoted arms 114. When the hoist pan is lowered, a cam face 119 on the mill engages the ends 118 of the arms to retract the latches permitting the segments 107, 108 to move to the position shown dotted so that material in the hoist pan is deposited evenly in the mill. Springs 122 lift the segments to the closed position when the hoist pan is empty. In another embodiment, the bottom of the hoist pan consists of a pair of semicircular segments 132, 133, Fig. 5, which are connected together by a pivot 138 and formed with arcuate guides 139, 140 engaging a cone 134 connected by a pin-and-shot 142, 143 to a stud 76. When the hoist pan is lowered, a cover 27 on the mill engages the cone to lift it relative to the hoist pan, the cone acting on the guides to pivot the segments downwardly to discharge the material into the mill. In a further embodiment, the bottom of the hoist pan is conical and is lifted by engagement of the cover of the mill with an actuator attached to the cone. In yet another embodiment, the bottom of the hoist pan consists of two semicircular segments 185, 186, Fig. 8b, which are joined by a strip of belting 187 and carried by legs 195 ... 198 pivoted to support rods 188, 191. In still another embodiment, the semicircular segments are interconnected by pivoted rods and carry rollers for engagement with a cover of the mill. The crane for the hoist pan may be mounted on an overhead monorail for movement between its different positions and to adjacent mills.,