Liquid purification or separation – Filter – Movable medium
Reexamination Certificate
2000-07-25
2001-07-17
Lithgow, Thomas M. (Department: 1724)
Liquid purification or separation
Filter
Movable medium
C210S396000, C210S400000, C210S401000, C210S232000
Reexamination Certificate
active
06260714
ABSTRACT:
TECHNICAL FIELD OF THE INVENTION
This invention relates to sludge filtration apparatus. More particularly, it relates to sludge filtration apparatus having chain-type belt press with fine synthetic resin fiber joined thereon, the filtering units of the belt press easily and detachably mounted, and the sludge compressed by the belt press including not only the filtering belt but also the pressing belt pressed by the compressing rollers.
BACKGROUND ART OF THE INVENTION
In the various kinds of industrial fields, generally, waste water is discharged in a considerable abundance. The treatment process of the waste water creates inevitably a considerable amount of the sludge which contains water. When the contained water is extracted from the sludge, it becomes so called “sludge cake”. It is preferable that the amount of contained water of sludge cake could be reduced as low as possible in order to deal with it easily after fact.
In a sludge filtration apparatus of the prior art, 2 sheets of filtering fabrics or nets are arranged on the low and high portions of the main frame respectively. And the filtering fabrics or nets move along around plural number of rollers under tension produced by a pair of rollers in order to dehydrate the sludge.
In such a sludge filtration apparatus of the prior art, there are several problems as followings
First, the filtering fabrics or nets tend to be always and seriously contaminated by particles of sludge. Ilence, timely, they have to be washed with enormous amount of water.
Second, since the filtering fabrics or nets are tensioned to dehydrate the sludge, they are continuously and excessively stretched and rubbed against the rollers by tension and turning force of rollers. As a result, the fabrics or nets tend to be worn out and damaged in relatively earlier stage to shorten lifetime thereof.
Third, in the prior art, frequent trouble of the run-off-the-track preventing device causes the filtering fabrics or nets to be broken down, and tends to halt the dehydrating process of sludge repeatedly for a short time or a long time occasionally.
Fourth, the sludge filtration apparatus of the prior art has a complicated structure which includes driving devices, tension controlling devices, washing devices, run-off-the-track preventing devices and so forth. Therefore, so many operators should check and maintenance the equipments continuously and frequently to spend large labor time in managing the large and complex facilities hardly. Also, frequent checking and maintenances require the casings of the equipments to be often opened, so that the opened equipments discharge contaminated airs which makes bad smell and air pollution unavoidable in the factory environments.
Fifth, in order to reduce the amount of the contained water of sludge cake rapidly and effectively, it would be preferable that sludge on the filtering fabrics or nets can be pressed between a pair of roller (pressing technique) or be sucked by suction device (sucking technique). In the above prior art, however, both such a pressing technique and sucking technique could not be available to the apparatus because these techniques cause sludge as well as water to pass the fabrics or nets, and cause the fabrics or nets to be clogged by the dust or dirt lumps and to be useless rapidly. So, in the prior art, in order to dehydrate sludge, areas of meshes in the filtering fabrics or nets should be widen only by applying the tension to the fabrics or nets (tension technique). But in the tension technique of prior art, workability is relatively low, and it requires many times in processing. And the resulted sludge cake of the above prior art has relatively higher amount of contained water.
In order to solve the problems of the prior art mentioned above, the
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applicant of this invention filed Korean Utility Model No. 1997-18821 which discloses a sludge filtration apparatus including pressing rollers and a filtering belt. The filtering belt of '1997-18821 has plural of filtering units with chemical resistant fine fibers of synthetic resin joined thereon, and a thick rubber belt on which plural of through-holes for passing sludge water are formed and to which the filtering units are attached one after another along the longitudinal direction of the rubber belt.
In the sludge filtration apparatus of '18821, in first, water of sludge is absorbed on the fine fibers of synthetic resin of the filtering units. Then the sludge and filtering units are pressed between a pair of rollers to extract water from them to yield to the sludge cake. So, the resulted sludge cake of the '18821 can has less amount of contained water than the above prior art's.
In the '18821, however, there are also some problems as followings
First, in the apparatus of '18821, the filtering units are attached to the rubber belt in a manner that the rubber belt has a flexible rod fixed on the bottom thereof and the filtering units are tied up to the flexible rod by a metal wire. When the filtering units are worn out or damaged and have to be replaced with new ones, operator should untie the old one from the rod and then again tie new one up manually. Therefore, so much time and labors should be required in the replacement work.
Second, in the apparatus of '18821, since only the rollers are involved in pressing sludge on the filtering unit, there is a limit to reducing the amount of contained water of the resulted sludge cake.
DISCLOSURE OF THE INVENTION
In view of the problems of the prior art and Korean Utility Model No. 1997-18821, It is an object of the present invention to provide a sludge filtration apparatus having chain type belt press with fine fibers of synthetic resin joined thereon which is designed such that the filtering units can be easily and rapidly displaced and relatively less time and labor can be required in maintenance and repair.
And it is another object of the present invention to provide a sludge filtration apparatus having chain type belt press with fine fibers of synthetic resin joined thereon which can produce the sludge cake having less amount of contained water than any prior arts.
And it is still another object of the present invention to provide a sludge filtration apparatus having chain type belt press with fine fibers of synthetic resin joined thereon in which it can be realized that the whole time for stopping the processing due to trouble or maintenance should be spent as less as possible.
In accordance with the invention, a sludge filtration apparatus having chain type belt press with fine fibers of synthetic resin joined thereon comprising: a frame; a filtering belt for receiving and carrying the sludge supplied by the sludge supplier; a driving roller fixed on the frame for driving the filtering belt wound therearound; a tension controlling means fixed on the frame for controlling the tension of the filtering belt out of the closed casing of the apparatus; and guide rollers fixed on the frame for guide the filtering belt wound therearound;
wherein said sludge filtering apparatus further comprising a pressing belt for pressing the sludge on and with the filtering belt to make the sludge into the sludge cake, said pressing belt being driven by a driving roller and pressed by plural of compressing rollers;
wherein said filtering belt includes: a chain being engaged with plural of sprockets of the driving roller, the tension controlling roller and the guide rollers; and a water absorbing and filtering portion fixed on the chain for filtering the sludge and absorbing water contained in it ; wherein said absorbing and filtering portion includes; filtering units each of them having the chemical resistant fine fibers of synthetic resin in a predetermined width and thickness, a binding rod for holding the fine fibers by binding together the ends of fibers therearound, and a holding piece for fitting detachably the binding rod therein; elongate grooves each of them having triangle shape in cross section for fitting detachably the holding piece therein; and support plates, each of
Joacobson Holman PLLC
Kim Young Tae
Lithgow Thomas M.
LandOfFree
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