Liquid purification or separation – Structural installation – Flume stream type
Patent
1993-04-14
1995-02-07
Manoharan, Virginia
Liquid purification or separation
Structural installation
Flume stream type
210160, 210396, 210400, 210401, 210408, 210526, B01D 33333, B01D 3516
Patent
active
053873378
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a screening device for use in the treatment of channelled water flows notably sewage, to remove detritus such as rags, string, plastic bags, condoms, and rubbish of other than a finely divided nature which might interfere with subsequent treatment processes.
BACKGROUND OF THE INVENTION
Difficulties are encountered in practice in the treatment of contaminated water flows such as sewage prior to fine filtration, due to the presence of heavy and generally untreatable objects such as rags, string, plastic bags, and the like.
If such items are not removed then proper and adequate treatment of the liquid does not result, and blockage of ducts and channels may occur.
A screening device is known comprising a continuously movable endless conveyor loop formed of a series of interconnected link pieces each having a lifting hook on which material to be screened is collected during movement through the contaminated water flow, and a rearwardly extending bar linkage.
The link pieces are mounted for rotatable movement on support rods extending across the width of the band conveyor loop such that as the link pieces are caused to rotate by means of a forced change in direction of travel of the loop, the books of the link pieces cooperate with the bar linkages of other link pieces, such that the bar linkages act to clear the hooks of collected material.
In addition a four armed rotating brush is used to clean the bar linkages of collected grease and similar unwanted deposits.
Whilst being effective, the prior art just described is complicated in design and costly to manufacture. It also requires the presence of two independently operable mechanical means to maintain the operating parts clean and free from contamination matter which builds up over time thereby reducing overall efficiency.
SUMMARY OF THE INVENTION
It is the object of the present invention to obviate the deficiencies of the prior art.
According to the present invention there is provided a device for separating solids from liquids comprising an endless rotatably mounted band of collecting arms for screened solid material, each of the collecting arms having a leading collecting face and two opposite sides adjacent the leading collecting face, and being mounted on support rods which are arranged in spaced relationship around the band, link pieces rigidly attached to the sides of collecting arms for linking one support rod to the next, such that the link pieces form continuous chains around the band, and separate the collecting arms one from the other to form slots between the link pieces, said link pieces being rotatable on the support rods to which they are attached, and a rotatable set of discharging teeth arranged to cooperate with said movable band by entering the slots as the band rotates to move along the leading collecting faces of the arms thereby to remove collected material gathered at the slots and from said leading collecting faces of the collecting arms.
Advantageously the discharging teeth are the teeth of a sprocket wheel which drives the movable band by means of said cooperation of the teeth thereof with said slots and the collecting arms.
To avoid clogging and to ensure maximum discharge of collected material at all times, scraper blades may be mounted between the continuous chains acting to dislodge matter accumulating on the flanks of the discharging teeth and the surfaces of the link pieces.
Preferably, the leading collecting face of each collecting arm lies on a circle, the center of which is the axis of rotation on the support rod to which the link piece of each collecting arm is attached.
The discharging teeth of the sprocket wheel preferably taper to an edge, which edge passes along and close to the surface of the leading collecting faces of the collecting arms along a respective row as the band revolves thereby removing collected solids therefrom.
The trailing flanks of the discharging teeth are preferably circular arcs described around the centers of the roots of the discharg
REFERENCES:
patent: 3706378 (1972-12-01), Markwick
patent: 4107040 (1978-08-01), Rudolph et al.
patent: 4214989 (1980-07-01), Rudolph et al.
patent: 4472273 (1984-09-01), Hagihara
patent: 4518494 (1985-05-01), Jackson
patent: 4521306 (1985-06-01), Day
patent: 4597864 (1986-07-01), Wiesemann
Haigh Engineering Company Ltd.
Manoharan Virginia
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