Patent GB-728155-A (GB)
Title: Improvements in or relating to conveying equipment
IPC: B65G65/28
Filed: 1952-08-18
Abstract: 728,155. Loading etc.; conveyers; lever load-handling machines. POHLIG AKT.-GES., J., and BRAUNKOHLENUND BRIKETWERKE RODDERGRUBE AKT.-GES. Aug. 18, 1952 [Aug. 17, 1951; March 14, 1952; June 20, 1952], No. 20663/52. Classes 78 (1), 78 (3), 78 (4) and 104 (2). An endless belt conveyer 8, Fig. 9, comprises conveying and return runs supported on spaced bogies running respectively on upper and lower stationary ropeways 9 and hauled along the ropeways by separate hauling ropes 6 or like haulage means. Lignite and overburden are both removed from the various levels in an open-cast mine working by a series of excavators, Fig. 1, each connected by a conveyer 1 of the above kind whose stationary ropeways are slung between the excavator and an intermediate mobile tower 2 supported on endless tracks so it can move forwards or sideways after the excavators associated with it have traversed a given arc on their section of the face of radius equal to the length of the connecting conveyer 1. As shown, there may be more than one intermediate tower, but one tower handles the mined material from all the excavators and this tower, Fig. 13, has a system of shoots 19 connectingeach of the conveyer discharge points associated with an excavator to either of two further conveyers 1, by means of a change-over flap below each discharge point, so that one of the further conveyers can be arranged to receive all the lignite, while the other receives all the overburden. The tower also has a series of winches 20 for adjusting the tension of all the conveyers associated with it. The two further conveyers carry the material up an incline out of the workings, the overburden being discharged at any desired part of the incline to fill in the worked part of the mine as the whole apparatus advances. As shown, the overburden may also be led to a dumping conveyer on the tower for filling in on both sides of the latter. The discharge on the incline is obtained by a carriage 18, Fig. 9, provided with series of wheels 16 and 17 for running on further ropes 12, 11 associated with the cables 9 by a series of connecting brackets 10. In order to flatten the belt so that the material on it may be discharged by an oblique scraper (not shown) mounted on the carriage, the bogies each consist of a pair of wheels 3 carried on separate transverse axles 7, one placed slightly forwardly of the other and arranged to slide axially relative to each other, one axle carrying one side of a cradle to the outer extremities of which the belt 8 is attached, while the other axle carries the other side of the cradle. The cables 9, 11 and 12 are mounted at the ends of the conveyer runs so that their spacing is normally that of the wheels 3 with the axles 7 retracted so that the belt is troughed. The wheels 17 on the carriage 18 are mounted in a series diverging from each end of the carriage where they are of normal spacing to the centre of the carriage where they are of the greatest spacing so that the belt is pulled laterally to a flat form as it passes the centre of the carriage, where the scraper is located. In a modification, Fig. 16, a belt 9 is carried in a series of cradles 5 supported by pairs of rollers 4 at each side on the carrying ropes 1, and is driven by hauling ropes 7. The belt is slung between carrying ropes 61 and 62 by loops 8 of varying length to even out the tension between the cradles, rope 61 being passed through eyes in the cradles while rope 62 passes through slots 10 in the cradles. On the conveying run rope 62 is held in a short horizontal portion of each slot 10 by the weight of material. At the discharge point a follower roller on a lever 14 on each cradle engages a cam rail causing rope 62 to be displaced so as to fall to the bottom of the slot so the material falls off laterally. On the return run the rope 62 falls back into the horizontal portion of the slot. Lifting tower.-A pair of girders 1, 2, Fig. 18, are pivotally connected to a pair of carriages 9, 10 at their lower ends and to a head 5 provided with cable clamps 6, 7 at their upper ends. By the luffing arrangement indicated the head can be raised to the height of the supporting cables of a conveyer, the cables clamped to it, and the conveyer thus lifted by further raising of the head to allow a mobile machine to pass underneath. It may also be lowered until girders 1, 2 are in alignment and supported by a wheel under the head, for transport on a rail track.