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Advantages
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Reduced
headroom. |
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Simple
design. |
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Good
accessibility to all working parts. |
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Ease of
installation. |
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High
screening capacity. |
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Low power
consumption. |
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Vibrations
not transmitted to supporting structure. |
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Momentum
compensation and free coupling. |
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Uninfluenced by frequency changes or variations in load. |
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Reduced
maintenance. |
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Resonance
screens are particularly useful in large and heavy screening installations
of high capacity and output. They operate at high intensity and the field
of application ranges 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 being 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. |
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Raw coal
screening up to 900 tph, Primary classification up to 500 tph, Clean coal
classifying and dewatering up to 250 tph, |
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Slurry dewatering |
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Classification of
coke, sinter, breeze ore pellets, coking coals. |
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Ore Preparation,
Chemical By Products, Stone, Limestone, Phosphate, Sand and Gravel
Industries - Pre screening. Coarse screening. Classifying. Secondary
screening. Dewatering. |
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 required to
overcome 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, with the driving shaft supported in roller bearing plummer
blocks mounted on the base frame, and having 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
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All plant
and machinery is designed and installed to meet customer’s individual
requirements and special conditions. Proven construction groups are
integrated into complete systems. |
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Complete
installations from Don Valley
provide the complete answer to any problem in the form of the best
process. At Don Valley,
planning and supply, together with follow up service, are considered to be
of great importance. |
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Every
effort is made to understand the particular problems of a client, and to
provide a solution that will incorporate maximum utilisation and economy. |
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All
enquiries are carefully studied, and recommendations proposed are based
upon considerable knowledge and expertise in problems of mechanical
handling. |
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Don Valley Resonance Screens use the
established principles of resonance screening as developed throughout many
years of experience. |
Rinsing Facilities
In certain screening
applications the provision of rinsing facilities in the form of water
sprays proves to be extremely advantageous.
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In preventing the
blinding up of screen apertures when screening fine damp materials. |
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To remove contaminants
such as clays. |
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To effect recovery
into the dense medium circuit of materials such as magnetite, the loss of
which is both costly, and a contaminant to the product. |
 Example Photographs
of Resonance Screens
       
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Don
Valley Engineering Co. Ltd
