page_title: Circle-throw vibrating machine
section_title: Design
hierarchical_section_title: Circle-throw vibrating machine / Design
caption_attribution_description: English: Circle-throw Vibrating Screen T-class
context_page_description: A circle-throw vibrating machine is a screening machine employed in processes involving particle separation. In particle processes screening refers to separation of larger from smaller particles in a given feed, using only the materials' physical properties. Circle throw machines have simple structure with high screening efficiency and volume. However it has limitations on the types of feed that can be processed smoothly. Some characteristics of circle-throw machines, such as frequency, vibration amplitude and angle of incline deck also affect output.
context_section_description: The standard unit is a single-shaft, double-bearing unit constructed with a sieving box, mesh, vibration exciter and damper spring. The screen framing is steel side plates and cross-members that brace static and dynamic forces. At the center of the side plates, two roller bearings with counterweights are connected to run the drive. Four sets of springs are fixed on the base of the unit to overcome the lengthwise or crosswise tension from sieves and panels and to dampen movement.  An external vibration exciter (motor) is mounted on the lateral (side) plate of the screen box with a cylindrical eccentric shaft and stroke adjustment unit. At the screen outlet, the flows are changed in direction, usually to 90 degrees or alternate directions, which reduces the exiting stream speed. Strong, ring-grooved lock bolts connect components.
  Variations in this design regard the positioning of the vibration components. One alternative is top mounted vibration, in which the vibrators are attached to the top of the unit frame and produce an elliptical stroke. This decreases efficiency in favor of increased capacity by increasing the rotational speed, which is required for rough screening procedures where a high flow rate must be maintained.
  A refinement adds a counter-flow top mounting vibration, in which the sieving is more efficient because the material bed is deeper and the material stays on the screen for a longer time. It is employed in processes where higher separation efficiency per pass is required.
  A dust hood or enclosure can be added to handle particularly loose particles. Water sprays may be attached above the top deck and the separation can be converted into a wet screening process.
caption: Circle-throw Vibrating Screen T-class[6]
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