SCREENING CYLINDER

Abstract

A cylindrical screening device including a plurality of profile bars, in which a number of ring shaped bar holders are arranged perpendicular to a cylinder axis and spaced apart from one another, or bundles of a number of bar holders spaced apart from one another are provided on the inside or the outside with open-edged recesses. The shape of the recesses correspond in a substantially complementary manner to that of the feet of the profile bars. The profile bars are inserted into the recesses, parallel to one another and parallel to the cylinder axis, wherein an outer bar holder is in each case arranged in the region of a respective face-side end ring of the screening device. The attachment of the end ring is simplified in that the outer bar holder is detachably connected with the end ring.

Claims

1. A cylindrical screening device comprising: a plurality of profile bars, each bar having a foot; a plurality of annular bar holders arranged perpendicular to a cylinder axis and are spaced apart from one another are provided on the inside or the outside of the annual bar holders with open-edged recesses, the shape of the open-edged recesses corresponding in a substantially complementary manner to that of the feet of the profile bars, and wherein the profile bars are inserted into the recesses parallel to one another and parallel to the cylinder axis; a face-side end ring; and an outer bar holder arranged in a region of the face-side end ring of the screening device, the outer bar holder being detachably connected with the face-side end ring.

2. The cylindrical screening device according to claim 1, wherein the outer bar holder is part of a bundle consisting of several bar holders.

3. The cylindrical screening device according to claim 2, wherein at least some of the bar holders of the bar holder bundle are detachably connected with the end ring.

4. The cylindrical screening device according to claim 3, wherein the detachable connection is a screw connection.

5. The cylindrical screening device according to claim 1, wherein one or more of the profile bars are profiled on the radial outer or inner circumference in the region of the end ring and a contact area of the end ring opposite of the profile is shaped complementary to it.

6. The cylindrical screening device according to claim 1 wherein the end ring includes a blocking ring arranged perpendicular to the cylinder axis; and at least one of the profile bars are profiled on the radial outer or inner circumference in the region of the blocking ring, and a contact area of the blocking ring opposite the profile complementary to it.

7. The cylindrical screening device according to claim 6, wherein the blocking ring is fixed axially to the end ring or between the end ring and the outer bar holder.

8. The cylindrical screening device according to claim 6, wherein the blocking ring is a ring shaped wire or a ring shaped disc.

9. The cylindrical screening device according to claim 1, wherein the end ring is a multi-part component.

10. A cylindrical screening device comprising: a plurality of profile bars, each bar having a foot; bundles of a number of bar holders spaced apart from one another are provided on the inside or the outside of the annual bar holders with open-edged recesses, the shape of the open-edged recesses corresponding in a substantially complementary manner to that of the feet of the profile bars, and wherein the profile bars are inserted into the recesses parallel to one another and parallel to a cylinder axis; a face-side end ring; and an outer bar holder arranged in a region of the face-side end ring of the screening device, the outer bar holder being detachably connected with the end ring.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above-mentioned and other features and advantages of this invention, and the manner of attaining them, will become more apparent and the invention will be better understood by reference to the following description of embodiments of the invention taken in conjunction with the accompanying drawings, wherein:

[0027] FIG. 1 illustrates a schematic view of an embodiment of a cylindrical screen basket of the present invention;

[0028] FIG. 2: is a schematic cross-section view through the cylindrical screen basket of FIG. 1;

[0029] FIG. 3a: shows a recess with a profile bar, of the cylindrical screen basket of FIGS. 1 and 2, before radial pressing;

[0030] FIG. 3b: illustrates the profile bar of FIG. 3a after radial pressing;

[0031] FIG. 4a: is a cross-sectional perspective view of the cylindrical screen basket of FIGS. 1 and 2 through an end ring with an outer bar holder and a blocking ring being illustrated; and

[0032] FIG. 4b: is a cross-sectional schematic view of the cylindrical screen basket of FIGS. 1, 2 and 4a through the end ring with the outer bar holder and a blocking ring being illustrated.

[0033] Corresponding reference characters indicate corresponding parts throughout the several views. The exemplifications set out herein illustrate embodiments of the invention and such exemplifications are not to be construed as limiting the scope of the invention in any manner.

DETAILED DESCRIPTION OF THE INVENTION

[0034] Referring now to the drawings, bar holders 3.5 are produced as single-component rings, for example by laser cutting. This is the basis for high dimensional accuracy of the screen basket of the present invention.

[0035] On the inside side, bar holders 3.5—as can be seen in FIGS. 1 and 2—have a multitude of evenly distributed recesses 4 for profile bars 1. According to FIG. 3a, these recesses 4 offer sufficient clearance so that profile bars 1 can be easily pushed axially through them.

[0036] As a result, the prefabricated screen basket consists of profile bars 1 positioned parallel to cylinder axis 2, profile bars 1 being held in place by several bar holders 3.5 positioned perpendicular to cylinder axis 2.

[0037] While FIG. 4b exemplifies several bar holders 3.5, which are axially spaced at a distance from one another, FIG. 4a shows an example of several bundles which consist of two bar holders 3.5 each and which are axially spaced at a distance from one another.

[0038] The screen openings of the screen basket are formed by the slots of adjacent profile bars 1. In practice, such slots often have a width of between 0.05 and 2 mm.

[0039] For stronger clamping of profile bars 1 in recesses 4, a permanent form fit between profile bars 1 and recesses 4 is created via radial forces F acting from the outside.

[0040] According to FIG. 2, the radial force is realized by way of several dies 8 that are evenly distributed radially over the cylinder circumference, and which act radially from the outside directly onto bar holders 3.5, and are therein directed, in particular, onto cylinder axis 2 of the pre-assembled screen basket. The axially arranged dies 8 of adjacent bar holders 3 which are arranged axially next to one another can also be designed as a common die 8.

[0041] In this case, the pressing surface of all dies 8, facing in the pressing direction, are formed by a circular section whose radius corresponds to the outer radius of the screening device after the pressing process. Since the outer radius of the screening device, formed by bar holders 3, is slightly larger before the pressing process than afterwards, there is a small clearance between bar holders 3 and the pressing surface in the center part of die 8 at the beginning of the pressing process. This clearance is acceptable at the beginning of pressing and the therewith associated lower pressing forces and decreases with progressive pressing.

[0042] Reshaping occurs in a gentle and uniform manner, so that there is no excessive strain on bar holders 3.5. Additional attachment of profile bars 1 can usually be dispensed with.

[0043] During the influence of the radial force, dies 8 are guided axially and radially in guide grooves.

[0044] Since the inside of bar holders 3.5 is not exposed to any supporting or bending forces during the radial force application, the radial force effect leads to a reduction in the diameter of force-actuated bar holders 3.5 and a plastic deformation of bar holders 3.5 in the region of recesses 4, as a result of which the area between profile bar 1 and bar holders 3.5, as shown in FIG. 3b, is being closed.

[0045] Due to the profiling of profile bars 1, as well as the complementary shape of recesses 4, strong clamping of the bar feet is achieved in respective recess 4.

[0046] On each of the two face ends of the screening device an end ring 6 is arranged, adjacent to an outer bar holder 5.

[0047] In FIG. 4b end rings 6 are each detachably connected by way of a screw connection 10 with axially outer bar holder 5 and in FIG. 4a they are each detachably connected by screw connection 10 with the axially outer bundle including outer bar holder 5 and an adjacent axially inner bar holder 3. This screw connection 10 is made by several screws evenly distributed over the circumference of end ring 6 and is highly reliable, which allows, for example, the raising of the screening device above end ring 6.

[0048] Welding and corresponding post-processing can be omitted. In addition, reusing end rings 6 after the screening device is worn out is possible.

[0049] In order to prevent profile bars 1 in the screening device from shifting axially, respective end ring 6 has a blocking ring 9 arranged perpendicular to cylinder axis 2.

[0050] In FIG. 4a blocking ring 9 is shown in the embodiment of a ring shaped wire with a circular cross-section and in FIG. 4b as a ring shaped disc. Securement of the axial position of blocking ring 9 is implemented in both cases by clamping a radial outer section of blocking ring 9 between end ring 6 and adjacent outer bar holder 5.

[0051] For the axial position securement of profile bars 1, the latter are profiled herein at the radial outer circumference in the region of respective blocking ring 9, wherein the contact area of blocking ring 9 opposite this profile 11 is complementary to it.

[0052] Profile 11 is designed in such a way that, in conjunction with the complementary contact area, a relative shift between profile bar 1 and blocking ring 9 is prevented. As a result, blocking ring 9, which is fixed axially to end ring 6, protrudes in both designs radially into profile bar 1.

[0053] Other possibilities of axial position securement or design of blocking ring 9 or profiling arise if end ring 6 is designed as a multi-part component.

[0054] Sectioning of end ring 6 is possible in radial, axial or circumferential direction.

[0055] The detachable attachment of end rings 6 to outer bar holder 5 or to the outer bar holder bundle can be carried out regardless of whether bar holders 5 have their recesses 4 as shown here on the inside or on the outside. This also applies regardless of the method of attachment of profile bars 1 to rod holders 3.5.

[0056] While this invention has been described with respect to at least one embodiment, the present invention can be further modified within the spirit and scope of this disclosure. This application is therefore intended to cover any variations, uses, or adaptations of the invention using its general principles. Further, this application is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which this invention pertains and which fall within the limits of the appended claims.