Resonance Screens

ENERGY EFFICIENT - HIGH CAPACITY - LOW MAINTENANCE – ISOLATED

Industries:-

  • Coal
  • Steel
  • Ore Preparation
  • Stone
  • Phosphates
  • Sand & Gravel

Applications:-

  • Pre-screening
  • Coarse Screening
  • Classifying
  • Secondary Screening
  • De-watering

Resonance screens are particularly useful in large and heavy screening installations of high capacity and output. They operate at high intensity and their fields of application range from large size screening to the screening of fines. Simple, rugged construction is a feature of Don Valley Resonance Screens which, combined with the large cross sectional area of the rubber parts, ensures long life. The working characteristics are capable of adjustment to provide the maximum screening efficiency for any given product. Two or more screen frames can be assembled in line to operate as one complete unit.

ADVANTAGES OF RESONANCE SCREENS

  • Reduced headroom
  • Accessibility to all working parts
  • Ease of installation
  • High screening capacity
  • Low power consumption
  • Vibrations not transmitted to supporting structure
  • Momentum compensation and free coupling
  • Uninfluenced by frequency changes or variations in load
  • Reduced maintenance

 

OPERATION

The principal of operation of Don Valley Resonance Screens is the interaction between two or more oscillating masses through resilient couplings of special design and material. The drive unit is elastically connected to the screen tray, and requires very little power to bring the tray into full oscillation even when starting up under load, other than that required for overcoming friction losses.

CONSTRUCTION

Don Valley Resonance Screens consist of a screen tray resiliently mounted on a weighted balancing frame through the medium of rubber drive buffers and resilient elastic laths. The direct weight of the tray is carried on support buffers fitted with tensioning devices. The drive is through a totally enclosed roller bearing mounted eccentric? having an adjustable elastically coupled connecting rod attached to a fabricated bracket fixed to the tray. The drive shaft is supported in roller bearing plummer blocks mounted on the base frame, with a grooved pulley for vee rope drive. The base frame is suitably weighted to reduce its movement to a minimum, and is mounted on resilient rubber foundation buffers to prevent the transmission of vibrations into the supporting structure. Don Valley Resonance Screens can be supplied with open type or cross braced screening trays as preferred.

APPLICATIONS

All plant and machinery is designed and installed to meet customer’s individual requirements and special conditions.

Applications include the following :-

  • Coal Industry - Raw coal screening up to 900 tph, Primary classification up to 500 tph, Clean coal classifying and dewatering up to 250 tph,
  • Slurry dewatering

Steel Industry

  • Classification of coke, sinter, breeze ore pellets, coking coals.

RINSING FACILITIES

Water rinsing can be used with Don Valley Engineering Resonance Screens, and this can be extremely advantageous in certain screening applications:-

  • Prevention of blinding of screen apertures when screening fine, damp materials.
  • Removal of contaminants such as clays
  • Recovery into the dense medium circuit of materials such as magnetite, the loss of which is both costly and a contaminant to the target product