Screening rake

Details Screening rake Screening rake

1993-10-08

1995-02-07

Upton, Christopher

Liquid purification or separation

Structural installation

Flume stream type

210160, 210400, B01D 3304

Patent

active

053873360

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a sieve rake for the removal of solid matter from a waste water current, with a driven sieve belt that can be immersed in the waste water current and that exhibits two lateral link chains, extending between which are support bars which support groups of filter members positioned in succession and provided with hooks.
Waste water must be mechanically purified of solid matter that is larger than a predetermined particle size, before being treated in clarification plants. Here the prior art is familiar with the process of conducting a waste water current through a sieve rake which retains the solid matter. Removal of the solid matter is necessary at regular intervals or continuously in order to avoid stoppage of the sieve rake.
Sieve and filter rakes that meet this end are known in various designs. The sieve rake usually exhibits a continuously circulating drive sieve belt of the paternoster type, that consists of individual sieve members whose interstices form the sieve area through which the waste water flows.
Usually the sieve members, or at least several of the sieve members that compose the sieve belt, are furnished with hooks, tiers, or other projections which serve to capture the deposited solid matter, particularly bodies of larger size, and to remove it from the waste water current. The solid matter is disposed of at the head of the sieve belt onto a removal device. A rotating brush can be provided to remove adhesive material.
Given the very different characteristics of the solid matter that accumulates, including large and solid bodies, damage to the sieve member, particularly to the attached hooks, is unavoidable. Sieve members thus damaged must be replaced.
In sieve rakes of the indicated type known to the prior art (company publication SK Technical Bulletin 120 "AQUA-GUARD") each of the sieve members furnished with a hook is supported by two support rods. However, these sieve members are positioned in stacked fashion such that all support rods are connected to each of the two adjacent support rods by way of several sieve members jointly supported by these rods. The replacement of damaged sieve members is therefore relatively involved and demands a longer interruption in operation, since in detaching two support rods it is necessary not merely to remove the sieve members supported jointly by these support rods, but also to partially detach sieve members extending to the adjacent support rods. Thus the sieve belt can only be returned to operation after the complete replacement of the damaged sieve members.
In another sieve rake design known to the prior art (DE-A-39 10 464) all adjacent sieve members belonging to a single group are supported only by two joint support rods. The connection to the given adjacent support rods occurs exclusively by means of connecting members that are not furnished with hooks. However, lateral link chains are not provided, so that when damaged sieve members are replaced this screening belt must also be removed from operation until all damaged screening members are replaced.
A longer interruption in operation is not normally possible for such sieve rakes, however, since solid matter accumulating on the sieve belt would constrain the belt, with the result that the current resistance would increase considerably and the waste water current would be unacceptably retarded. As a result, it is necessary either to permit the removal from operation of the sieve rake in need of repair by the parallel positioning of one or several other sieve rakes, or to remove the sieve rake from the waste water channel and replace it during the repair period by a reserve sieve rake, for example, a simple sieve rake that can be cleaned manually. All of these measures are complicated and expensive, however.
Thus the problem addressed by the invention is to elaborate a sieve rake of the initially described type in such a way that it remains functional after the failure of individual sieve members or entire groups of sieve members and after their removal, to thereby either t

REFERENCES:
patent: 1207376 (1916-12-01), Davidson
patent: 2307601 (1943-01-01), Nichols
patent: 3856628 (1974-12-01), Hagihurn
patent: 4188294 (1980-02-01), Hagihurn
patent: 4597864 (1986-07-01), Wiesemann
patent: 5060872 (1991-10-01), Chambers, Sr.
patent: 5102536 (1992-04-01), Wiesemann

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