DE3403383C2 - Sorting drum - Google Patents

Abstract

In the case of a sorting drum with a perforated jacket which can be rotated essentially about a horizontal axis, an outer, second, unperforated jacket is provided at least at one end thereof and is fastened to the sorting drum. A sump in which accepts collects is formed by at least one annular retaining wall located in the area of the end of the drum. This is carried upwards through the outer jacket and serves to re-moisten the not yet sorted fiber suspension in the area of the respective end of the sorting drum.

Description

a) one located at least in the area of one end of the drum, the sorting drum (1) at a distance surrounding, outer, imperforate jacket (2);

b) a substantially annular baffle extending radially inward from the jacket (2) (4), which is located in each case at this drum end (3,10);

c) axially arranged between the outer jacket (2, 2 ') and the jacket of the sorting drum (1) running ribs (14,15).

2. Sorting drum according to claim 1, characterized by a second, located between the outer Jacket (2, 2 ') and the jacket of the sorting drum (1) extending storage wall (5, 5') at the other end of the outer jacket (2, 2 '), the outer jacket (2) at the entry (3) or discharge end (10') the sorting drum (1) is located, the drum to its end having the outer jacket is inclined slightly downwards.

3. Sorting drum according to claim 2, characterized in that the inner diameter of the am Entry end (3) located, by the outer jacket (3) carried retaining wall (4) is larger than the inner diameter of the entry opening (11) and the inner diameter of the retaining wall (5, 5 ') is equal to or greater than the diameter of the sieve drum (1).

4. Sorting drum according to one of claims 1 to 3, characterized in that the ribs (14,15) in The direction of rotation of the sieve drum (1) forms an acute angle with the tangent to the outer casing (2, 2 ') at its attachment point (base point).

5. Sorting drum according to claim 4, characterized in that the outer jacket (2) is the sieve drum protrudes in the axial direction.

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The invention relates to a sorting drum with a perforated jacket according to the preamble of the claim 1.

Such a sorting drum has become known from DE-A 31 14 376.

These sorting drums are generally used to remove coarse dirt from the fiber suspension. They have a correspondingly large hole size for their perforation. You leave the sorting drum at least partially into the fiber suspension that has already passed through the perforation, that is to say the accepts suspension immerse. The immersion depth is of course small. Now there is the problem that the fiber suspension is largely carried up on the drum wall with, so that it is out of the area of the submerged part of the drum comes out and thus thickens, which is why the good ones are then sorted out Fiber is hardly possible if you don't want to work with a lot of spray water.

It is now the object of the invention. a re-humidification or irrigation of the at Tronimelmaniel to bring about a high fiber content without significant addition of splash water.

This task is achieved in a device of the type mentioned by the features of the characterizing Part of claim 1 solved.

The invention is explained below with reference to two exemplary embodiments shown in the drawing, axial sections through the sieve drum according to the invention are shown in each case.

According to Fig. 1, the sorting drum with perforated Coat an entry side 3 with the entry opening 11 and a reject vent opening 10 on the opposite front end. The waste paper suspension is heavily soiled, z. B. as it is withdrawn from a pulper, into the frontal opening 11 introduced. For this purpose z. B. the Chute 8 indicated by dash-dotted lines may be provided. There is also a double-barreled screw conveyor Helix indicated by dash-dotted lines, which is placed on the inside of the drum shell. In the shown inclination of the drum, this is absolutely necessary; in the fiber suspension in the direction of the To transport reject end 10 of the sieve drum. The sieve drum rotates around the central one Axis 12 and is mounted on rollers for this purpose. Either the rollers can be driven or it can be a toothed ring, which is attached to the outside of the drum shell via a gear drive is to be driven. The drive by means of the rollers is well known and z. B. from DE-OS 32 10 385 can be seen.

The fiber suspension, from which the coarse dirt has been sorted out, passes through the perforation into the collecting container 6 and is diverted through the vent opening 7. The reject falls over the reject vent 10 out of the sieve drum.

At the entry end 3, the sorting drum now has an outer jacket 2 which is essentially concentric is attached to the sieve drum on this. It has an annular shape at the entry end 3 of the sieve drum Stowage wall 4, the inner diameter of which is significantly larger than the diameter of the entry opening 11.

As the drum rotates, the drum shell takes up considerable amounts of fiber suspension with and raises this proportion far beyond the liquid level shown. The outer coat 2 through its rotation with the sieve drum, it promotes less fiber suspension to a considerable extent Consistency upwards, so that from the space 13 between the sieve drum and the outer jacket 2 is thinned The fiber suspension again passes through the perforation into the sieve drum 1 and thus above the liquid level ensures that the thickened suspension is diluted back. You can do this nor by axially extending ribs which are attached to the outer shell 2 in the space 13 are, similar to that shown in FIG. 2 with 15, improve. With such an arrangement you could also use the Ribs do not put exactly perpendicular to the jacket 2, but in such a way that they each with the tangent to the The circumference of the outer shell 2 forms an acute angle in the direction of rotation. This is how these ribs work together with the jacket 2 like a scoop, so that

the fiber suspension of low consistency is conveyed almost to the culmination point of the sieve drum 1, so that they flow along the inner wall of the same from above to the thickened suspension; i.

According to Figure 2, the inclination of the drum is opposite as in the case of Fig. 1. by the entry end 3 'is at a higher level than the reject end. In this case there is the outer jacket 2 'at the reject end. In this area the screen jacket of the sorting drum narrows conical. The conveying effect of the outer casing 2 'in the intermediate space 13' is achieved by the axial ribs 15 reinforced. The reject gets through the discharge opening into the container 16, which, for example, as a transverse to the sieve drum extending conveyor belt can be formed. The accepted material is collected in the collecting container 6 '.

In the drawings, the vertical is also indicated by the large arrow.

It is also possible to design the end sections in accordance with FIG. 1 and F i g. 2 on one and the same Finally, in this case you could also use the outer jacket over the length the sorting drum continuously. Of course, the sorting drum should be used in the last two cases mentioned be inclined only relatively slightly to the horizontal. This is then similar to the case where the The sorting drum wades completely in the accepted material. Incidentally, it could also be arranged exactly horizontally in all cases be.

The preferred variant is that according to FIG. 1, because in the case of FIG. 2 possibly a more or less strong, therefore not always desirable, dilution with additional water is necessary. However, there is the possibility of fiber suspension of suitably lower consistency and thereby avoiding the disadvantage.

For this purpose 2 sheets of drawings

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Claims (1)

Patent claims: 1. Sorting drum for pulp suspensions for the production of paper, which around a substantially horizontal axis revolves with a frontal entry opening located at one axial end and a reject opening on the face at the opposite end, marked by