Bearing and Shaft in a Screen

Two Bearing (Unbalanced) Screens

There are the simplest of vibrating screens where they have a single shaft with an eccentric mass that rotates to induce vibration. The screen frame is supported on springs to allow it to move freely in a circular motion. The screens have to be inclined as these machines rely on gravity to convey oversized material along the screen.

Double Shaft (Straight Line Motion) Screens

These screens have the advantage that they can operate horizontally and take up less headroom as a result. They utilize two shafts with eccentric masses that rotate in opposite directions, synchronized with gears or a chain drive. The result is that the rotating masses cancel each other out except along a single line of action. This causes the screen to move in a linear fashion by tilting the line of action to 45 degree, oversized material is conveyed along the screen. There are also triple-shaft variations on this design that develop elliptical motion.

 

Four Bearing (Single Shaft) Screens

The principle behind this type of screen is similar to the two bearing, single shaft screen except that the shaft is machined eccentric and two more bearings are added to attach the offset portion of the shaft to the screen frame. As the shaft rotates, the eccentric shaft forces the frame through the circular motion defined by the degree of eccentricity. The action resembles that of a crankshaft. In order to balance the motion of the frame, counter-balance weights are added to the shaft between the outboard shaft support bearings and the eccentric bearings. Although still found in the field, these types of screens are no longer commonly manufactured. 

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