Liquid purification or separation – Gravitational separator – Mechanical constituent mover
Reexamination Certificate
1999-02-18
2001-04-24
Upton, Christopher (Department: 1724)
Liquid purification or separation
Gravitational separator
Mechanical constituent mover
C210S541000, C198S728000, C198S731000
Reexamination Certificate
active
06220455
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to a scraper bar arrangement to be used particularly in connection with a liquid handling reservoir, such as a clarification basin or like. The arrangement includes one or more scraper bars placed one after another in the longitudinal direction. The arrangement also includes transferring means for moving of the scraper bar/bars, such as two transmission chains or like placed side by side and driven by a drive wheel and turning wheel arrangement or accordingly. In connection with the transferring means the scraper bar/bars is/are attached by an attachment arrangement, preferably removably, such as by a screw joint or like.
BACKGROUND OF THE INVENTION
In the type of solutions presented above it is usual to arrange the scraper bars in a way, that they are being transfered by means of chains placed at the edges of the reservoir in a way, that they scrape in connection with the bottom material existing therewith to a sludge pocket and that they lead material correspondingly on the surface to a collecting chute, that goes cross the reservoir. In this connection, the scraper bars have been carried out by profiles, that are often made of, for example, fiberglass, and that are attached to the chains traditionally by a screw joint. A disadvantage of totally uniform scraper bars is particularly the troublesome installation of the same, whereby very accurate and careful installation measures are required, so that the holes to be made in the scraper bars are just in the right positions. This causes often several problems in practice, for example because of unevenness of the bottom of the clarification basin and because of other reasons as well. That is why the holes must often be left to be done on-site during installation. One disadvantage of the type of scraper bars described above is furthermore that, that they are placed always without exception totally one-sided in respect to the chains. That is why attachment of the same causes always resonance during use of the same as well as continuous bending moment through attaching arms being fixed to the back sides of the chains. That is why the chains tend to bend by the joints of the same during use. This naturally causes problems, when the scraper bars are aimed to be kept in a perpendicular position, for example against the bottom during use of the same. Additionally because of the reasons described above all service and maintenance measures, for example because of breakage of the scraper bars often cause long terminations for use. One crucial disadvantage of the type of scraper bars represented above is furthermore that, that they must be changed as a whole, that is very expensive when scraper bars, for example made of fiberglass are being used.
On the other hand from the following documents: U.S. Pat. No. 4,747,481, U.S. Pat. No. 4,722,434, CH 554 791 ja GB 2 133 763, it is previously known to exploit a bar entirety that is formed of bar parts to be connected to each other. All of the solutions being presented in the above documents are, however, conveyors, that are ment particularly for transfering of material, that is so called pusher or scraper conveyors. Due to deviating purposes of use in each solution above there has been exploited a so called link chain. The operating reliability of the link chain is particularly in the purpose of the invention in question most probably unsatisfying. In addition to that, when this type of chain is being used the drive and turning wheels must be replaced with very short intervals particularly because of wearing, that is due to those unproportionately high surface loads.
SUMMARY OF THE INVENTION
It is the aim of the scraper bar according to this invention to achieve a decisive improvement in the problems presented above and thus to raise substantially the level of knowledge in the field. To achieve this aim, the scrape bar according to the invention is primarily characterized in, that the scraper bar is formed known as such of at least two first bar parts. The first bar parts are fixed to the transfering means, such as to two transmission chains placed side-by-side. The scraper bar is also formed and of at least one second bar part that has been attached between the above by means of coupling means. The parts operate preferably by quick locking principle, and locking means. The second bar part of the scraper bar comprises one at least partly hollow housing structure being preferably made of glassfiber, carbon fiber, composite material, ceramic material and/or like, that is arranged to be used preferably with at least two buffer heights, differing essentially from each other.
As the most important advantages of the scraper bar arrangement according to the invention may be mentioned simplicity and reliability of construction, use and principle of the same. Additionally installation stages as well as later service and maintenance measures of the scraper bar are very pronounced and easy to carry out. Also, the costs due to maintenance of the scraper bar arrangement may be minimized by changing advantageously only the first bar parts belonging to the scraper bars. That may be carried out, for example by wooden structures at the cheapest. In this case the most remarkable part of the scraper bar arrangement that is the middle parts of the scraper bars acting as the actual scrapers, which are not very often being harmed in practice during normal use, may be kept in use continuously. Furthermore, one crucial advantage relating to the invention is that, that the draw line (see
FIG. 2
c
) of the chain may be adjusted in respect to the scraper bar, in which case resonance being typical for traditional scraper bars may be avoided.
The operating reliability of the scraper bar arrangement may be furthermore improved by using a support arrangement that guides movement of the chain particularly at the turning wheel, whereby, for example, skipping of the chain in most heterogeneous circumstances and in most heterogeneous clarification basin applications may be efficiently prevented, despite even careless or unprofessional upkeeping of the process.
Advantageous embodiments of the scraper bar arrangement according to the invention are described below in relation to the scraper bar arrangement.
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Connolly Bove & Lodge & Hutz LLP
Finnketju Invest Oy
Upton Christopher
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