Mining machinery running details for information

 

The above picture shows the possible modes of operation of the improved ball mill. For each mode of operation, the ball movements during the milling process are confined to the vertical plane by the mill chamber walls and by the applied external magnetic field. Solid Pan configurations provide a rugged pan to withstand the impact of heavy loads and still provide consistent feed control. A common use may be high production sand & gravel operation with haul trucks dumping into a hopper and the feeder discharging onto a scalping vibrating screen.The strength and direction of the magnetic field are adjusted externally by repositioning the magnets. The trajectories of the balls are controllable and  reproducible for each mode of operation in this design. The general patterns of the ball movement are a function of the magnet positions and the rotational speed of the mill. In Case A the mill operates in the conventional mode of operation; no magnetic classifier field is introduced to the mill. After a number of revolutions, the trajectories of the individual balls are quite chaotic. In Case B  the introduction of a magnetic field to the ball mill now controls the trajectories of the balls.
All  Hongxing feeders incorporate a heavy duty vibrator assembly with cast shafts, open housing – flow through oil lubrication, double row spherical roller bearings and precision cut gears. Adjustable gear timing and bolton counterweights allow for maximum stroke adjustment (both angle and length) to achieve optimum feed control and consistent production. Solid pan, straight deck and step deck configurations offer additional versatility in feeder design to consistently deliver on the promise of outstanding performance.
By moving the magnet away from or nearer to the mill, different attractive forces can be generated. This dramatically affects the ball movement pattern. In Case B the two magnets positioned at the bottom of the mill result in a characteristic change in ball movement and split the balls into two groups with the ball rotation in each group being in opposite directions. Case C can be obtained by reducing the mill rotational speed or by reducing the strength of the magnetic field; the balls both rotate and oscillate around the
equilibrium position at the bottom.
Incorporating one set of grizzly bars at the discharge end of the feeder allows smaller material to be “screened out” of the feed material. This arrangement is common on standard duty models in portable plant applications, feeding the oversized material directly into a crusher. Grizzly sections are typically 4′ to 5′ long.