DE245796C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

- M 245796 CLASS ία. GROUP

Patented in the German Empire on July 30, 1911.

The subject of the invention is an improvement in sand washing and classifying devices the kind in which the crop is carried by a number under a sprinkler sequentially arranged screening drums is sent, which the sieved Let it fall well into transfer channels and the coarser residues through collecting funnels transport in collection container.

The object of the invention is remixing Coarse grains of sand that have already been sieved out with the finer grains located in the transfer channels Prevent sand for sure.

This purpose is achieved by using the front and rear edges of the screening drums arranged, laterally projecting scrapers and through on the drum shaft attached collecting trays.

The scrapers of the drums

so prevent overflushing the front and back The coarser ones that emerge from the drums and stick to the edges when they are turned Grains of sand along the drum wall into the transfer channels for the sieved finer sand, while the collecting trays transfer coarser sand into the finer ones Do not allow screening drums along the drum shaft.

The drawing shows an embodiment of the subject matter of the invention, for example. It shows:

Fig. Ι the device in vertical longitudinal section, .

Fig. 2 shows one provided with the improvement and a simple sieve drum in side view and

3 shows a view of the sieve drum from above.

The device consists in the usual way of a mounted in an inclined frame ι, the screen drums 2 to 7 supporting shaft 8, a sprinkling device resting above on supports 9 10, the · arranged below the drum mouths, into the collecting tanks 11 to 16 protruding collecting funnels 17 to 22 and the transfer channels 23 to 28 located under the drums. The shaft 8 also carries the Αφ drive pulley 29 at the lower end and an in the opening of the drum 2 protruding sieve funnel 30 into which the feed channel 31 flows out.

According to the invention, the screen drums 2 to 7 are provided on the front and rear edges with a laterally projecting flange a and b , against which a scraper c attached to the collecting boxes 11 to 16 or to the collecting funnels 17 to 22 rests. The front edge flanges α extend up to the front edge of the transfer channel leading to the next following drum and are located above the collecting tanks that are open there. The rear edge flange b of the drums protrudes into the associated collecting funnel. On the shaft 8 are also at a short distance from each other and from the

Claims (3)

Drum bottoms each have three round disks d attached, against each of which a scraper β rests. The round disks d all protrude into the collecting funnel of the respective upstream sieve drum. The mode of operation of the device is as follows: If during the sieving, which is proceeding in a known manner, as a result of the very slight gradient in the lower part of the sieve drums or as a result of splashes, water and sand emerges from the front opening of the drums and sand on the drums due to the low number of revolutions of the drums front edge of the same remains (Fig. 2, drum I) so this sand is stripped by the scrapers c and falls into the collecting tank belonging to the drum. The sand cannot be carried along by the drum while it is rotating and cannot be washed away via the drum shell into the transfer channel by the trickling water (Fig. 2, drum II). This means that no coarser sand can get into the sieved finer sand from the front. In the same way, the coarse sand that emerges from the bottom openings of the drums and has stuck to the drum edges is removed by the scrapers so that it cannot be flushed back over the drum wall into the transfer channel for the finer sand. The coarse sand emerging from the floor openings and remaining on the floor between them is carried along by the drum as it rotates and rinsed off by the trickling water. The coarse sand arriving at the shaft 8 is now passed from the shaft 8 to the next screen drum for the finer sand. But this is opposed by the collecting trays d, on which the sand slides down, so that it is removed by the scrapers e and falls into the collecting funnel in which it belongs. The collecting trays are arranged in threefold number to prevent the coarser sand from flowing over into the finer ones and also to avoid overspraying such sand. The wipers c and e can, if necessary, also be replaced by splash water, and it goes without saying that the device can undergo structural changes at all without affecting the essence of the invention. Godfather ν t-An Proverbs: 1. Sand washer and classifier with one behind the other, with collecting funnels and transfer channels provided screen drums, characterized in that the screen drums on the edge of the front and rear drum base are provided with scrapers, as well as that the shaft between each two successive drums carries collecting plates, for the purpose of roughing a transition Prevent sand from turning into finer sand. 2. Embodiment of the device according to claim 1, characterized in that the stripping devices of the drums consist of laterally projecting edge flanges (a, b) in contact with strippers (c) , of which the front edge of the leading to the next screen drum leading to the next Transfer channel past into the associated collecting tank, the rear (b) reach into the associated collecting funnel. 3. Embodiment of the device according to claim 1, characterized in that the collecting plates consist of round disks (d) reaching into the collecting funnel of the respective upstream sieve drum and are touched by strippers (e) attached to the funnels. 1 sheet of drawings.