Liquid purification or separation – Gravitational separator – Mechanical constituent mover
Patent
1994-01-12
1995-12-26
Upton, Christopher
Liquid purification or separation
Gravitational separator
Mechanical constituent mover
210531, B01D 2120
Patent
active
054784719
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a sludge scraping apparatus for treating by scraping sludge or sand sedimenting in a treatment pool such as first or last sedimentation pool in one direction of the pool.
BACKGROUND ART
For example, in the first or last sedimentation pool of sewage a treatment plant, it is designed to sediment sludge in the bottom of the pool, and scrape it in one direction of the pool, and discharge the sludge out of the pool. The design is the same in a tap water treating plant.
As one method of sludge scraping, the flight circulation chain driving system is known.
This system comprises a plurality of rotary shafts rotatably mounted with the axial center directed in the width direction of the pool, sprockets mounted on each rotary shaft by two pieces each set apart, and right and left chains applied through these sprockets. At the outer side of the chains, a plurality of flights (scraping plates) are provided at specific intervals in the circulation direction, and as these flights move along on the guide rails provided in the bottom of the pool, the flights scrape and collect the sludge in the bottom of the pool in one direction, and bring the sludge to the sludge pit. The sludge is pumped out of the pit and discharged out of the pool.
This chain driving system is large and complicated in structure, expensive, and difficult to install, and it is high in maintenance cost because of circulatory motion, and is inferior in economy.
On the other hand, instead of the chain circulation system, the system of moving along the bottom of the pool linearly and reciprocatively is known. The system comprises a longitudinal guide (guide rail) provided in the bottom of the pool, a work member for moving along the guide, drive means (rope or the like) for moving the work member reciprocatively, and a scraping member attached to the work member, and it is designed to scrape and collect the sludge settling in the bottom of the treatment pool in one direction by the motion of the scraping member, and discharge out of the pool.
It has the following defects.
In addition to guides and their mounting devices, two guides, right and left, are provided apart from each other in the width direction of the pool, which require a large work member straddling widely between the guides. Accordingly, the structure was very large and complicated, and it was expensive and difficult in installation, and still more the maintenance control cost was high for keeping circular motions and it was not economical.
It is hence a primary object of the invention to present an apparatus which is simple in the entire structure and easy to install, and inexpensive on the whole.
SUMMARY OF THE INVENTION
The invention presents a sludge scraping apparatus comprising a guide having a longitudinal direction in a sludge scraping direction of a treatment pool, a work member moving along the guide, drive means for moving the work member, and a scraping member attached to the work member, thereby scraping and collecting the sludge deposited in the bottom of the treatment pool at least in one direction by the motion of the scraping member, and discharging out of the pool, wherein the guide is a monorail, and the work member is designed to move reciprocatively along the guide.
Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only, and thus are not limitative of the present invention, and wherein
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REFERENCES:
patent: 2101079 (1937-12-01), Lund
patent: 2101081 (1937-12-01), Lund
patent: 3868323 (1975-02-01), Fux
patent: 4401576 (1983-08-01), Meurer
patent: 4514303 (1985-04-01), Moore
patent: 4927537 (1990-05-01), Meurer
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