SCREENING APPARATUS

摘要

There is provided screen apparatus (10) comprising side walls (11) having a lower edge portion (12) configured to accept tubular screen support members (13). An upper edge (14) extends from the inlet end (15) of the side walls to an apex (16) from which a declining edge (17) extends to the foot of the side walls (11). The lower edge (12), upper edge (14) and declining edge (17) are each provided with edge stiffening (21) in the form of steel Z-section. An intermediate Z-section stiffener (22) is secured to the side walls (11) and are disposed to follow the general curve of the banana screen panel support members (13). The apex (16) has a recess adapted to receive an exciter mount casting (27) having an exciter assembly (31) bolted thereto with a direction of aligned with the plane containing the centre of gravity of the apparatus. A torque tube (33) is secured between the respective exciter mount castings (27), 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.