Screening machine for screening material according to size

A circle throw screening machine for screening particulate material according to size, the machine comprising:

• a housing (2) having a longitudinal aspect, an upper perforated deck (7) and a lower deck disposed underneath the perforated upper deck;
• a frame (3) for mounting the housing;
• a suspension system (4) for mounting the housing to the frame to allow isolation of the housing relative to the frame;
• three rotatable unbalanced drive shafts (5) coupled to the housing (2) to vibrate the housing in response to rotation of the drive shafts;
• and
• a drive mechanism (6) coupled to the unbalanced drive shafts (5) to effect synchronous rotation of the three drive shafts in the same direction;
• wherein the three rotatable unbalanced drive shafts are equally spaced along a longitudinal aspect of the upper perforated deck (7),
• wherein the drive mechanism (6) comprises three external drive shafts (22), each of which is coupled to an unbalanced drive shaft, and in which the external drive shafts (22) include a central external drive shaft (22A) and two side external drive shafts (22B, 22C), wherein the central external drive shaft is operatively connected to the motor (23) by a drive belt (24) and each of the side external drive shafts are operatively connected to the central external drive shafts by a timing belt (25).

A circle throw screening machine for screening particulate material according to size, the machine comprising:

• a housing (2) having a longitudinal aspect, an upper perforated deck (7) and a lower deck disposed underneath the perforated upper deck;
• a frame (3) for mounting the housing;
• a suspension system (4) for mounting the housing to the frame to allow isolation of the housing relative to the frame;
• three rotatable unbalanced drive shafts (5) coupled to the housing (2) to vibrate the housing in response to rotation of the drive shafts;
• and
• a drive mechanism (6) coupled to the unbalanced drive shafts (5) to effect synchronous rotation of the three drive shafts in the same direction;
• wherein the three rotatable unbalanced drive shafts are equally spaced along a longitudinal aspect of the upper perforated deck (7) and the distance between a first end of the upper perforated deck (7) and the first drive shaft, and the distance between the first and second drive shafts, are substantially the same.