Liquid purification or separation – Sectional chamber press type – With residue removal or liquid agitation
Patent
1996-06-17
1998-04-21
Savage, Matthew O.
Liquid purification or separation
Sectional chamber press type
With residue removal or liquid agitation
210230, 100198, B01D 2534
Patent
active
057414181
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an improvement of a filter cloth suspending apparatus in a filter press in which a filter cloth suspended between filter plates is traveled and a filter cake produced between the filter cloths is discharged.
BACKGROUND ART
As a filter cloth suspending apparatus in a filter press, an example shown in FIG. 4 in Examined Patent Publication No. Sho.-55-18528 has conventionally been known. In the suspending apparatus, a pair of filter cloths are provided between filter plates, upper edges of the filter cloth are adhered to each other, an upper supporting bar for the filter cloth is inserted to the adhesion portion, a lower portion of the filter cloth is put around a guide roll and then fixed to a lower s supporting bar. Further, the upper and lower supporting bars are connected to the both ends of a driving chain latched around a sprocket of a driven shaft, and filter cloths are suspended on the upper and lower supporting bars. Further, bevel gears provided for the driving shaft and the driven shaft are engaged to each other to rotate so that the filter cloth is lifted by rotating the driving shaft.
In another suspending apparatus for the filter cloth shown in FIGS. 1 and 3 in Unexamined Patent Publication No. Hei.-2-261508, a chain wheel provided on an upper filter plate is slidably arranged on a driving shaft, and a driving chain for the filter cloth is latched around this chain wheel to suspend the cloth. Further, in another suspending apparatus for the filter cloth shown in FIG. 2 in Examined Patent Publication No. Sho.-58-45842, a lower portion of a suspended filter cloth is secured to a wind-up roll, the filter cloth is lowered by the wind-up roll, and the filter cloth is lifted with a drive wheel.
However, in the suspending apparatus providing the supporting bar on the filter cloth on the upper and lower sides thereof, as shown in the above mentioned Examined Patent Publication No. Sho. 55-18528 and Unexamined Patent Publication No. Hei 2-261508, when the filter cloth is drove to be traveled so as to discharge cakes produced between the filter plates, the upper supporting bar is lowered, and the lower supporting bar is lifted, and then, both of the upper and lower supporting bars are crossed to each other. And, at this crossing, the upper supporting bar is brought into contact with the lower supporting bar, and the supporting bars are apt to be bent, or the filter cloth is apt to be broken, by a clinging condition of the cake to the filter cloth. It is necessary to widen or open the space or distance between the filter plates to prevent this interference. However, when the space is widened, the number of the filter cloths per unit area is reduced, and consequently, the filtration area of the apparatus is also reduced. Thus, in order not to widen the space between the filter plates, strong and thin supporting bars has conventionally been used. Nevertheless, it is actually difficult to completely avoid the contact. Thus, one side of the pair of cloths provided between the filter plates is regulated by a guide roll, positioned under the filter plates, and adjacent to the driving shaft or the driven shaft positioned above the filter plates, and the filter cloths are inclined at widening the space between the filter plates (hereinafter referred to as an opening of the filter plates). Further, when the filter cloths are traveled, a string-shaped driving means comes into contact with the filter cloths to generate abrasion, thereby shortening a life for the filter cloth. Since the drive wheel is put between bearings provided above the filter plates, a frictional resistance is generated between the bearing and the driving shaft at the opening of the filter plates, which results in abrasion of the driving shaft and bearing. Additionally, in the apparatus in which the filter cloth is wound, as shown in the above-mentioned Examined Patent Publication No. Sho.-58-45642, when the filter cloth is clogged, the diameter of the wind-up roll is changed in the width direc
Iwatani Akitoshi
Kawasaki Hiroichi
Ishigaki Company Limited
Savage Matthew O.
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