Abstract: There is provided exciter apparatus having a cast housing (11) and mounting base (14) secured to mounts bolted to the side plates of screening apparatus. A pair of shafts are mounted for rotation in and extend out of both sides of the cast housing (11). A gear assembly is keyed to each shaft t form a gear train coupling the shafts. The outer ends of each of the shafts are provided with eccentric masses (30) aligned on their respective shafts 180° out of phase. Drive spools (35) are driven by electric motors (not shown). Coupling spools (37) are adapted to accept flexible couplings for joining exciter units together. The gears (26) comprise 9 teeth of an 18-tooth module at 325.0 mm pitch circle diameter (PCD) and 65 mm axial dimension. The lands between the teeth are at a notional diameter 262.6 mm, the teeth having a corresponding notional tooth height of 31.2 mm to the PCD.

Abstract: There is provided screen apparatus comprising side walls having a lower edge portion configured to accept tubular screen support members. An upper edge extends from the inlet end of the side walls to an apex from which a declining edge extends to the foot of the side walls. The lower edge, upper edge and declining edge are each provided with edge stiffening. A torque tube is secured between the respective exciter mount castings, the torque tube and stiffened side wall being selected to provide that the first fundamental frequency mode greater than the exciter frequency is at least 2 Hz greater than the exciter frequency and the first fundamental frequency below the exciter frequency is at least 2 Hz lower than the exciter frequency.

Abstract: There is provided exciter apparatus having a cast housing (11) and mounting base (14) secured to mounts bolted to the side plates of screening apparatus. A pair of shafts are mounted for rotation in and extend out of both sides of the cast housing (11). A gear assembly is keyed to each shaft t form a gear train coupling the shafts. The outer ends of each of the shafts are provided with eccentric masses (30) aligned on their respective shafts 180° out of phase. Drive spools (35) are driven by electric motors (not shown). Coupling spools (37) are adapted to accept flexible couplings for joining exciter units together. The gears (26) comprise 9 teeth of an 18-tooth module at 325.0 mm pitch circle diameter (PCD) and 65 mm axial dimension. The lands between the teeth are at a notional diameter 262.6 mm, the teeth having a corresponding notional tooth height of 31.2 mm to the PCD.

Abstract: There is provided screen apparatus comprising side walls having a lower edge portion configured to accept tubular screen support members. An upper edge extends from the inlet end of the side walls to an apex from which a declining edge extends to the foot of the side walls. The lower edge, upper edge and declining edge are each provided with edge stiffening. A torque tube is secured between the respective exciter mount castings, the torque tube and stiffened side wall being selected to provide that the first fundamental frequency mode greater than the exciter frequency is at least 2 Hz greater than the exciter frequency and the first fundamental frequency below the exciter frequency is at least 2 Hz lower than the exciter frequency.