Liquid purification or separation – Processes – Separating
Patent
1986-09-24
1988-02-09
Sever, Frank
Liquid purification or separation
Processes
Separating
210525, B01D 2104, B01D 2120
Patent
active
047240881
DESCRIPTION:
BRIEF SUMMARY
KNOWN ART
Known scraping devices for removal of sediments in rectangularily shaped settling basins are rather complicated structures having a plurality of movable parts.
Swedish allowed patent application No. 8302563-5 relates to a quite simple scraping device, which includes a vehicle, on which two scraping blades adjacent each other are pivotally disposed. Shoulders, which are arranged at the turning points of the vehicle, turn the scraping blades into their intended positions, either an active scraping position or an elevated passive idle or return position. The pull cable is connected partly to one of the gable-ends of the vehicle and partly to its other gable-end.
DESCRIPTION OF THE INVENTION
One object of the present invention is to build a scraping device, which is simpler than known scraping devices and comprises fewer movable parts.
Another object of the invention is to build a scraping device, which can be connected, in a ready manner, to several scraping devices, which are identical with it and jointly in succession in the direction of movement are capable of removing sediments from the bottom of a settling basin, particularily an extended one.
The scraping device according to the present invention comprises a sledge on a guide on the bottom of a settling basin as well as a carrier, which is rotatably disposed on the sledge and carries a scraping blade into at frist and active working position for sediment scraping towards an output area and then an elevated passive rest or return position, when the scraping device is pulled away from the output area after the working phase. The carrier turns the scraping blade into its intended position, because the pull cable is provided with a holder in the carrier. Thus, the pull cable performs two tasks, partly of pulling the sledge in the working direction and the return directin and partly of lowering the scraping blade at the return points of the scraping device, at first into the working position and then into the return position. The pull cable can accomplish this while pulling and at the same time guiding without any such additional mechanical regulatory devices, which known scraping devices employ.
The sledge, which carries the carrier and the scraping blade attached to the carrier comprises a profiled bar. Its cross section or the cross section of sliding shoes, which are inserted into it, has such a shape, that it cannot be elevated from or run off its guide. The carrier is rotatably disposed around an axle on the sledge. Said axle is horizontally disposed and its direction is perpendicular to the direction of movement of the scraping device. The scraping blade, which is attached to the carrier, is carried to its active working position, when the pull cable pulls the carrier towards the output area of the basin and subsequently to its passive rest and return position, when the pull cable pulls the carrier in the opposite direction, in order not to scrape the amount of sediment, which has been fed or scraped towards the output area, away from the output area or scrape newly settled material in the wrong direction.
In order to prevent the sledge and its carrier and scraping blade from tilting and turning over in relation to the guide, despite the fact that the sledge is retained in its position by the guide thanks to the profiling of the sledge or its sliding shoes, the two ends of the scraping blade are provided with wheels, which support the sledge and the advance of the scraping blade along the bottom of the basin. In case the axles of the wheels were extended towards the sledge, they would coincide with the axle of the carrier on the sledge. Thus, the wheels are always in touch with the bottom of the basin, regardless of what the angle between the scraping blade and the bottom of the basin is.
The inventor was at first not successful with the concept of employing a carrier for the scraping blade and a holder on the carrier for the pull cable due to the fact that the scraping blade was not elevated but was instead locked in its working positio
REFERENCES:
patent: 1918742 (1933-07-01), Elrod
patent: 2160534 (1939-05-01), Briggs
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