Brushing – scrubbing – and general cleaning – Machines – With means to pass a solid cleaning agent and a fluid...
Patent
1996-11-18
2000-02-29
Chin, Randall E.
Brushing, scrubbing, and general cleaning
Machines
With means to pass a solid cleaning agent and a fluid...
15104062, B08B 906
Patent
active
060293020
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a cleanable scraper station.
A cleanable scraper station of the type indicated is known from the marketing and shop drawings of a manufacturer and supplier of cleanable pipeline systems; these printed publications have been made available only to a limited number of users but not to the public at large.
Both product and, in the case of flush cleaning, a cleaning means flows through the state-of-the-art scraper station; as a result of the prescribed immobilization of the scraper in the scraper station, contact surfaces are formed between scraper and scraper housing which are not accessible for adequate cleaning during flushing.
To this extent it exhibits the cleaning process disadvantages of another state-of-art cleanable scraper station (WO-A-91/17386); product does not flow around the latter during its travel, in contrast to the former, so that, especially in the processing of high-quality or hygienically especially sensitive products, the passage section of a T-branch facing the scraper station is not scrapeable for the purpose of recovering the product which has accumulated there. Although the reference does contain a statement to the effect that the dispatching or receiving station is connected directly to the product flow section by way of the transitional element of the T-branch, in each instance there nevertheless remains an area in which product losses occur and, on the other hand, in which the product stagnates during product flow, since this area cannot be sensed by the product flow as dead space.
Hence the invention is based on the problem of developing a generic scraper station so that its cleaning capacity during flushing is improved, uninterrupted cleaning of the entire surface of the scraper in particular being ensured.
The decisive difference between the scraper station claimed for the invention and that of the state of the art is that in a first embodiment the scraper is placed in its flow-around position by means of a controllable second stop in conjunction with the movable first stop. The positioning is designed so that the scraper is separated by adequate clearance from the components bounding it on all sides, that is, so that the scraper possesses limited mobility on all sides. In an alternative second embodiment the scraper is additionally positively locked in a screen cage guard which is connected to the movable first stop. An alternative third embodiment provides that the scraper be placed in its flow-around position exclusively by means of a screen cage guard connected to the movable first stop in its flow-around position.
The screen cage guard mounted on the movable first stop, which guard consists in one preferred embodiment claimed for the invention of at least two U-shaped elements which, as viewed axially outward, form an insertion opening, an opening narrowed relative to the latter, and a radially widening grip opening, imparts additional advantages to the cleanable scraper station. Firstly, the scraper can be gripped securely, even in the vertical inlet direction of movement against the force of gravity in the enlarged cross-section, and moved from its closed position to its flow-around position in the enlarged cross-section. This is ensured by positive-locking retention of the scraper between at least three U-shaped elements. In addition, the positive locking retention of the scraper may be designed so that the scraper cannot free itself from its positive locking retention. In this case the controllable second stop may be dispensed with. The positive-locking retention of the scraper is overcome only if the scraper is transferred by the screen cage guard to its locked position and then forced from the guard by the product impinging on it and into the cleanable pipeline section adjoining it. Another advantage of the positive locking retention of the scraper in the screen cage guard is that the scraper can easily be removed from the opened scraper station by means of this positive locking.
In order to be able to clean the s
REFERENCES:
patent: 2172636 (1939-09-01), Coberly
patent: 2948143 (1960-08-01), Pruitt
patent: 4185809 (1980-01-01), Jonnes
Coura Herbert Robert
Scholz Gundar Helge
Chin Randall E.
Tuchenhagen GmbH
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