MOUNTING OF WEDGE
WIRE PANELS ON VIBRATING DECK FRAME
While mounting of
Wedge Wire Screen Panels, tit ost care should be taken that
all screen panels are rigidly fixed on the deck frame. The cover
rail of Flats used for bolting the panels on the deck frame
must not be put directly on the panel surface. Rubber packing
in between must be provided.
Sufficient rigid
fixing is necessary so as not to develop any secondary vibration
(flexing) under operation as, this will result in premature
failure of screen panels. To ensure the rigid fixing during
operation periodical check of tightening bolts is recommended.
INDUSTRIAL APPLICATIONS
Wedge wires can be
employed in almost all industrial processes which require very
fine and uniformly accurate aperture, combining rapid discharge
of material and high mechanical strength. Some of the specialized
applications of these screens are given below:
1.
Coal and Coke Washeries
Flat and curved wedge
wire screens and Centrifuge Baskets with suitable re-inforcements
are used for dewatering processes on stationary and moving frames,
suction filters and centrifugal driers.
2.
Ore Beneficiant Plants
In Iron and other
Ore benificiant plants, wedge wire flat screens, Curved screens
and Centrifuge baskets of fine and very fine aperture are used
for efficient Dewatering and recovery of fines.
3.
Sugar Mills.
Flat, curved and
cylindrical wedge wire screens are used for Juice Filtration
and Bagasse Separation drainage in tanks in conjunction with
scraper conveyors as well as for draining crushed sugar cane
supply in D.S.M. Screens.
4.
Cement, Chemical and Fertilizer Plants.
Flat panels, Curved
wedge wire screens, Cylinders and Centrifuge baskets with cylindrical
type, conical type and pusher type have many and varied applications
in these industries.
5.
Cellulose, Wood and Straw Pulp and Board Industries
Wedge Wire cylinders,
Flat panels and Centrifuge baskets are used for preliminary
screening for knot catchers and for efficient fibre recovery
Wedge wire screens ensure greater efficiency than the conventional
perforated or machined slotted plates.
6.
Sewage, Effluent and Water Treatment
Flat wedge wire
decking in final settlement tanks provides tertiary treatment
for the reduction of suspended solids. It is also the medium
used in a technique for the consolidation of sludges where the
rate of filtration is controlled at low operating pressures.
Sewage, aluminium hydroxide, iron hydroxide and other industrial
sludges are being successfully dewatered on wedge wire.
7.
Malt & Food Grain Drying Floors & Solvent Extraction
Plants
Wedge wires are also
used for making up ventilation floors and has been found very
suitable for malt kiln flooring, grain drying flooring and air
curtains. Vertical type Solvent Extraction Plants also uses
Wedge Wire Screens for high efficiency of extraction.
8.
Salt Washery
Cylindrical and Conical
type centrifuge baskets of fine aperture to suit any existing
centrifuges having precise aperture, high mechanical strength
and corrosion resistance are extraordinarily being used in modern
salt washeries. Curved screens are also being used. The usual
aperture ranges from 0.075mn to 0.2mm.
WEDGE WIRE PROFILE
:
Wedge Wires can
be supplied in the following profiles
1.
FLAT TOP:
The most commonly
used Profile giving best screening efficiency over the whole
range in most applications. It is excellent in dewatering of
slurry, and is extensively used in Coal Washeries. We denote
FLAT TOP as profile which is equivalent to commonly named "b"
profile.
2.
SQUARE TOP:
Suitable for the
larger aperature screens used with highly abrasive materials.
The parallel section allows a considerable wear on top surface
before the abrasion affects the widening of aperture. However,
for fine slit the clewatering efficiency is lower than the flat
top because of greater tendency to blind the aperature. Our
Square top profile are equivalent to commonly named "c"
profile.
3.
DOUBLE ANGLED PROFILE:
This special profile
has two angles, along its vertical depth, which impart both
lateral and vertical strength to the profile. It is suitable
for finer aperature Screens. Its free clearance efficiency is
slightly lower compared to FLAT TOP profile but has higher life
against wearing. This double angled profile is equivalent to
commonly named "a" profile.
4.
CONICAL TOP:
Designed particularly
for fine mesh screens for dewatering of slurries, the sloping
top directs any water or other fluid present towards the slit
apertures. Much of the abrasion due to the passage of material
over the screen is borne by the conical top which can wear down
without affecting the accuracy of the screen. It has slightly
more tendency to "blind" than with the flat top.
CROSS
RODS DIAMETER AND PITCH :
The Standard
sizes of Cross rods and pitch provided are:
- 7.6mm diameter
cross rod at 70mm pitch.
- 12mm diameter
cross rod at 70mm pitch.
- 7.6mm diameter
cross rod at 66mm pitch.
- 12mm diameter
cross rods at 66mm pitch.
- 5mm diameter
cross rod at 70mm pitch with two spacing lugs on the profile
wire.
- 5 mm diameter
cross rod at 66mm pitch with two spacing lugs on the profile
wire.
Out
of the above Sr. No. I & 2 are most common and widely
accepted combination and Sr. No. 3, 4 , 5 & 6 are for
special applications.
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