EP0031111A1 - Continuously operating centrifuge - Google Patents

Abstract

1. Continuously operating centrifugal for curing suspensions with crystalline solids, especially sugar centrifugal, with a curring basket (1), conically extended towards the discharge end, on whose inner area for curing the liquid a screen (8) is laid, mounted on the lower rim (12), by means of a clamping ring (6), distinguished by the fact that a supporting plate (9) is solidly connected with the lower rim (12) of the screen (8), embedded in a clearance (6b) of the clamping ring (6), arranged on the outer area (6a) turned towards the curing basket (1).

Description

The invention relates to a continuously operating centrifuge, in particular a sugar centrifuge, with a centrifugally widening centrifugal drum at the discharge end, on the inner surface of which a syringe is thrown off at the lower edge by means of a clamping ring. attached sieve rests.

Centrifuges of this type are used to spin off sugar filling masses, salt suspensions or other mixtures with crystalline solids. So that only the crystalline substances are retained by the centrifuge sieve, these sieves must be very finely perforated, which in turn requires a small sieve thickness. Such thin sieves are subject to great wear and tear and must therefore be able to be replaced quickly and safely. In the known centrifuges, the sieves are held at the lower edge of the sieve by clamping effects. With large drums, in particular, adequate fastening is not possible because the tensile forces acting on the screens are greater than the clamping forces.

In addition, sieves in large drums consist of several parts because a one-part sieve is difficult to manufacture and assemble. Both the centrifugal drum and the clamping cone are not always precisely machined, so that the known clamp fastening of the screen between the clamping ring and the drum jacket is very disadvantageous. Especially when the drum casing is not exactly round, it is not possible to achieve uniform clamping effects over the entire circumference. As a result, it cannot be avoided that individual sieve segments fly out during operation.

The invention has for its object to provide a simple and secure attachment of the deck screens, which is effective even with inaccurately machined centrifuge parts such as drum jacket, clamping ring and the like.

This object is achieved in that a holding plate is connected to the lower edge of the sieve and lies in a recess of the clamping ring which is recessed on the outer surface facing the centrifugal drum.

With this measure, the screen is not only clamped, but additionally hung in, so that the tensile forces occurring during operation are absorbed solely by the holding plate.

A particularly simple fastening of the holding plate to the sieve is achieved by means of spot welding. Other similar fastenings such as soldering and the like are also possible.

An embodiment of the invention is shown in the drawing and is described in more detail below.

• Fig. 1 einen Schnitt durch die Zentrifuge,
• Fig. 2 eine vergrößerte Darstellung im Bereich des Haltebleches,
• Fig. 3 das Sieb mit dem Halteblech,
• Fig. 4 ein Siebsegment.

It shows:

• 1 shows a section through the centrifuge,
• 2 is an enlarged view in the area of the holding plate,
• 3 the sieve with the holding plate,
• Fig. 4 shows a sieve segment.

The centrifuge essentially consists of a drum jacket 1, a base 2 with hub 3, an accelerator pot 4 and an accelerator cone 5. A clamping ring 7 is pressed against the drum jacket 1 by means of the screws 7, the centrifuge sieve 8 being between the drum jacket 1 and the clamping ring 6 inserted. The centrifuge drive is not shown. The clamping ring 6 is provided on its outer surface 6a with a recess 6b into which a holding plate 9, which is fixedly connected to the centrifuge sieve 8, is inserted. In addition to a fine deck screen 8, a coarser support screen 1o can be inserted between the drum jacket 1 and the deck screen 8. Both screens are configured at the upper edge of the drum, that the dry spun sugar or the like flows out of a cone 11 over the flange 17 and the removed liquid is discharged through the support screen 1 ₀ upward and between the flange 17 and the flange 16 of the drum. 1 Clamping pieces 18 ensure free passage of the liquid.

The centrifuge screen 8 consists of several segments 8a, which are individually inserted into the centrifuge. Each segment is provided at the lower edge 12 with a holding plate 9a. For this purpose, this edge 12 of the segment 8a is not perforated. The side edges 13 are also imperforate. In the exemplary embodiment, segment 8a is shown with two perforations 14 and 15 running in different directions.

The retaining plates 9, which are loosely inserted into the openings 6b of the clamping cone 6, ensure that the sieve 8 is securely fastened, which is securely and sufficiently locked even in the event of excessive tensile forces.

Claims (3)

1.) Continuously working centrifuge, in particular a sugar centrifuge, with a centrifugally expanding centrifugal drum at the discharge end, on the inner surface of which is fixed by a clamping ring attached to the lower edge for throwing off the syrup, characterized in that with the lower edge (12) of the sieve (8) a holding plate (9) is firmly connected, which lies in a recess (6b) of the clamping ring (6) embedded in the outer surface (6a) facing the centrifugal drum (2). 2.) Centrifuge according to claim 1, characterized in that the holding plate (9) is soldered, welded or glued to the sieve (8). 3.) Centrifuge according to claim 1, characterized in that the sieve (8) consists of several segments (8a etc.) and each segment (8a) is connected to a separate holding plate (9a).

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