SORTER AND ADAPTERS FOR THIS

Abstract

The invention relates to a sorter comprising a screening element of substantially rotationally symmetrical shape that is open at both its ends (inlet and outlet ends). Furthermore, a rotor supporting the screening element is provided, the axis of rotation of which is identical to the axis of rotational symmetry, with the screening elements having different diameters between the inlet and outlet ends. This maintains a differential speed between the screening elements and the peripheral speed component of the material to be sorted up to the outlet end. The sorter is characterized in that at least two rotor sections with different diameters and associated screening elements of matched diameter are arranged in the axial direction, and are rigidly connected to one another in the axial direction via an adapter between the two screening elements.For example, the inlet rotor section can have a smaller diameter and the outlet rotor section a larger diameter. If the screen operates according to the inflow principle, the rotor sections surround the screen baskets at a radial distance from the outside.

Description

The invention relates to a sorter having a screen element of substantially rotationally symmetrical shape open at its two ends (inlet and outlet ends) and a rotor carrying a sorting element, the axis of rotation of which is equal to the axis of rotational symmetry, the screen elements having different diameters between the inlet end and the outlet end in order to maintain a differential speed between the sorting elements and the circumferential speed component of the material to be sorted up to the outlet end.A sorter for fiber suspensions of the above-mentioned type is known from DE 38 31 845 C2. This prior art also describes a sorter with a screen basket of substantially rotationally symmetrical shape, which is open at its two axial ends (inlet and outlet ends), and with a rotor carrying sorting vanes or sorting elements, the axis of rotation of which is equal to the axis of rotational symmetry, wherein annular baffle elements extending radially into the screen space are provided for reducing the circumferential speed of the suspension to be sorted up to the outlet end to a differential speed between the sorting vanes or sorting elements and the suspension to be sorted from the screen basket circumference. Sorters from this prior art lead to a complicated and structurally very complicated configuration of the inner region in cooperation with the sorting elements. In particular, the sorting elements and the screen basket configuration must be matched to one another with regard to the shape. Such a design, as is known from DE 38 31 845 C2, does not allow a conversion of existing, conventional sorting, in which the screen elements and the rotors have a uniform diameter from the inlet end to the outlet end in the axial direction.The invention aims at configuring a sorter of the type mentioned at the beginning in such a way that rotors and screen elements can be used in each case in the axial direction between the inlet and outlet ends, which rotors and screen elements have matched but different diameters, so that the sorters of the usual designs can realize a more effective sorting performance. The design outlay is to be selected in such a way that the sorter is able to be restored to the desired configuration at any time without appreciable conversion. An essential object of the invention is therefore to achieve a flexible redesign of a sorter with the least possible technical outlay.According to the invention, for this purpose a sorter is provided with a screen element of substantially rotationally symmetrical form, which is open at its two ends (inlet and outlet ends) and with a rotor carrying a sorting element, the axis of rotation of which is equal to the axis of rotational symmetry, wherein the screen elements have different diameters between the inlet end and the outlet end in order to maintain a differential speed between the sorting elements and the circumferential speed component of the material to be sorted up to the outlet end, which is characterized in that at least two rotor regions with different diameters and associated screen elements adapted in diameter are arranged in the axial direction, and which are rigidly connected to one another in the axial direction via an adapter between the two screen elements.In the solution of the sorter according to the invention, the rotor speed in the inlet region or inlet region is reduced overall by approximately 20% compared to the rotor region at the outlet end, for example in the reject region. This results in a reduction of the flow capacity of an order of magnitude of approximately 25%. The solution principle according to the invention is that the cylindrical rotor body is divided into two parts, the upper rotor unit having for example a smaller outer diameter and analogously the diameter of the screen elements (for example a screen basket) in the upper region of the sorter is reduced. In order to achieve that the diameter change of the rotor and the sieve element adaptation correspond to the original dimensions of the sieve elements, for example sieve basket, with respect to the seats of the sieve elements of the sorter, according to the invention an adapter is provided which is formed as an intermediate piece between the upper sieve element seat and the lower sieve element with the aid of the adapter in such a way that the sieve element seats at the inlet end and at the outlet end maintain the usual, original size. This simple structural change results in a corresponding saving of energy.Further preferred embodiments of the sorter according to the invention are given in claims 2-8. For example, the rotor region on the inlet side has a smaller diameter and the rotor region on the outlet side has a larger diameter. The screen elements can preferably be designed in the form of screen baskets.For the sake of structural simplification, the rotor regions are furthermore connected to a central, common drive, so that separate drives for the respective rotor regions can be omitted. This common drive comprises a motor, a pulley and a central bearing chair.The sorter is preferably designed such that the adapter carries a process analysis unit with a data logger, a transmitter unit and an energy supply, which comprises, for example, a pressure sensor for the accept side, a pressure sensor for the inlet and a vibration sensor. Thanks to the configuration of the adapter, there is thus sufficient installation space in the sorter according to the invention, so that a corresponding process analysis unit with data logger, transmitter unit and energy supply can be provided. As a result, process analysis data can be easily acquired and can then convey valuable information regarding the sorting process to the operator of the sorter.It has proven particularly expedient in the sorter that the reduction in diameter of the screen elements is 3%-35%, preferably 5%-20%. Preferably, an increase in the height of the screen element with a simultaneous reduction in diameter to 0%-30%, preferably 5%-25%, is provided. The change in the screen basket height (screen cylinder height) is intended to compress the reduction in the screen basket surface area by the reduction in screen element diameter, so that the overall capacity of the screen element is not restricted.Furthermore, according to the invention, an adapter for a sorter of the type specified in the preamble of claim 1 is provided, which adapter is designed such that a two-part screen element is formed with assignment to the corresponding rotor regions, wherein the inlet-side screen element has a smaller diameter than the axially spaced outlet-side screen element.The design is preferably such that, in the case of substantially cylindrical screen elements, preferably in the form of screen baskets, the adapter corresponds with respect to its cross-sectional dimensions to the screen seat arrangement of the sorter, so that no additional redesigning measures of the sorter are required.As already mentioned, the adapter according to the invention has sufficient installation space, so that a process analysis unit with data logger, transmitter unit and power supply can be provided in the adapter. Such a process analysis unit comprises, for example, a pressure sensor for the acceptance side, a pressure sensor for the inflow and a vibration sensor. However, these are only examples for ascertaining process analysis information and data. Such a process analysis unit for monitoring the state of a screen basket is known, for example, from EP 3 533 925 B21.The invention will be described in more detail below with reference to the accompanying drawing, by way of non-limiting example. The drawing shows: FIG. 1 is a schematic side view in section of a conventional sorter known per se, FIG. 2 is a schematic, overall, fragmentary sectional view of a preferred embodiment of the present invention; FIG. 3 is a corresponding view of an alternative embodiment of a sorter operating on the inward principle; FIG. 4 is a corresponding schematic sectional view to illustrate several details and arrangement of an adapter and assignment to the usual seat dimensions or screen seat dimensions of a sorter; FIG. 5 is a sectional view taken along line A--A showing a preferred arrangement and layout of an adapter; FIG. 6 shows a further embodiment of a sorter and adapter according to the invention similar to FIG. 3 ; FIG. 7a is a schematic illustration of the rotor vanes on the same and the associated screen elements; and FIG. 7 bshows a view similar to FIG. 7 aof an alternative embodiment, wherein the rotor vanes are provided at a radial distance from the rotor body accordingly.The invention will be explained in more detail below with reference to preferred embodiments with reference to the attached drawing without any limiting character.FIG. 1 shows a conventional design of a sorter S having a sorter housing 1. In the vicinity of the upper side of the sorting housing 1, an inlet Z for the material to be sorted is arranged, which inlet opens into an inlet space ZR. At an axial distance from this, an accept outlet Ak and a reject outlet R are provided in the sorting housing 1 near the bottom. Within the inlet chamber ZR in the sorting housing 1, a screen element 2 in the form of a screen basket is arranged, which is preferably cylindrical. Arranged radially spaced apart from this is a rotor denoted overall by 3. A drive device for the rotor 3 comprises a drive motor M 1, a belt pulley A 1 and a central bearing block LS. In this conventional sorter S, the screen basket 2 rests on an upper screen basket seat O and a lower screen basket seat U. The uniformly cylindrical screen basket 2 has a screen basket diameter BD.FIG. 2 schematically shows a sorter according to the invention, designated as a whole as S1. The same or similar parts as in FIG. 1 are provided with the same reference numerals. In contrast to the sorter S according to FIG. 1, the sorter S 1 in FIG. 2 has in the sorting housing 1 a two-part screen basket, namely a screen basket 2A and a screen basket S 2B. The screen basket diameter AD of the screen basket 2A is smaller than the screen basket diameter BD of the screen basket 2B. Similarly, the rotor includes a first rotor portion 3A and a second rotor portion 3B. These rotors 3A and 3B are correspondingly adapted radially to the dimensions of the screen basket 2A and 2B. The rotor rotational direction is indicated by an arrow in FIG. 2.The screen baskets 2A and 2B are fixedly connected to each other via an adapter A. More details of this adapter are explained and illustrated in the following figures of the drawing. The adapter A is designed and designed in such a way that it fixedly connects the screen baskets 2A and 2B, which differ in their diameter, in such a way that the adapter A is supported on the upper screen basket seat O and is supported on the sorting housing 1 axially up to the beginning of the screen basket 2B. The screen basket 2B has a screen basket diameter BD which corresponds to a uniform screen basket 2 in FIG. 1, for example. Thus, the adapter A forms an intermediate piece for the screen basket 2A with the smaller screen basket diameter AD and the screen basket 2B with the larger screen basket diameter BD. The screen basket 2B with the screen basket diameter BD rests on the lower screen basket seat U which is customary per se. As in the prior art according to FIG. 1, a single motor M is provided as the drive device for the rotor 3A and 3B, which drives the two rotors 3A and 3B in the direction of rotation indicated by an arrow in FIG. 2 via a belt pulley RS and a central bearing seat LS.The design according to the invention enables the rotational speed between the two rotor bodies 3A and 3B to be decoupled and to be able to be changed. In this case, the rotor body 3A facing the inflow chamber ZR can be operated at a lower rotational speed, with the result that significant energy saving can be realized. In particular, a technological simplification is achieved, the complexity of the construction is reduced and the costs can be optimized as a result. In the design according to the invention, the rotor speed of the rotor 3A in the inlet chamber ZR can be substantially reduced overall compared to the rotor 3B in the outlet region, i.e. in the reject region R. The cylindrical rotor body comprises a rotor 3A and a rotor 3B, wherein the screen basket diameter AD is reduced in the upper region. In order to achieve that this change in diameter of the rotor 3A and the corresponding adaptation of the screen basket 2A can be used using the conventional screen basket seats O and U known per se, the adapter A is provided as an intermediate piece between the upper screen basket seat O and the lower screen basket seat U.As can be seen from the illustration according to FIG. 2, the adapter A does not alter the installation seats, screen basket seat O and screen basket seat U which are provided for conventional one-piece screen baskets. This means that no appreciable structural change of the screen basket seats U and O is required by means of the adapter A. In order to compensate for the reduction in diameter of the upper screen basket 2A, its screen basket height is extended by ΔhA in the axial direction. Therefore, the upper adapter flange of the adapter A is suitably of conical / conical construction. At the same time, it is achieved that the accept flow can be discharged unimpeded via the accept outlet Ak. For reasons of stability, in the acceptance region in the vicinity of the acceptance outlet Ak, the adapter A is designed in the form of a supporting structure which can comprise tension struts or, for example, a perforated supporting jacket (back-up cylinder). This solution according to the invention with the adapter A is thus suitable in particular for subsequent installation in a conventional sorter known per se, which is designated by S in FIG. 1, for example.The adapter A comprises, for example, concept-side struts for absorbing force and compensating the occurring bending moments of the screen basket seats O and U.FIG. 3 shows a sorter S2 as it operates according to the inward principle in contrast to the sorter S1 explained in FIG. 2 above. This means that in the inlet chamber ZR of the sorter S2 a sorting material flow in the sorting housing 1 is directed from the outside to the inside. Thus, the rotors 3A' and 3B' are disposed spaced radially outward with the screen baskets 2A' and 2B', therefore, the adapter A' is provided as an intermediate piece for supporting the screen basket 2A' via the screen basket 2B'. Thus, the position of the adapter A' is different from the position of the adapter A in FIG. 2, and the upper screen basket diameter is denoted by AD' and the lower screen basket diameter is denoted by BD'. All parts which are the same or similar to those in FIG. 2 are provided with the same reference numerals.It remains to be noted only as a difference that the adapter A' is provided with a support between the lower screen basket seat U and the smaller-diameter screen basket 2A. As shown, the screen elements, such as screen basket 2A' and screen basket 2B', are located radially inward relative to rotors 3A' and 3B'. The respective screen basket diameters are designated AD' and BD' in FIG. 3, wherein the screen basket with the screen basket diameter AD' is assigned to the rotor 3A', while the screen basket diameter BD' is assigned to the rotor 3B'.FIG. 4 is an enlarged view of the details of FIG. 2 for illustrating the arrangement of the adapter A. Thus, the adapter A abuts on the upper screen basket seat O and is designed and designed to axially support the screen basket 2A having a smaller diameter so as to increase the screen basket height thereof by ΔhA. At the end of the screen basket 2A, the adapter A makes possible, via the screen basket 2B with a larger diameter, a support on the lower screen basket seat U of the sorter S 1. The support is effected by virtue of the adapter A via the respective screen basket flanges which, like the upper and lower screen basket flanges 15o and 15u and also 16o and 16u, are supported. Identical or similar parts to those in FIG. 2 are provided with the same reference numerals in FIG. 4.FIG. 5 includes a side view and a sectional view taken along line A-A. From this illustration, in particular the struts of the adapter A are illustrated with solid lines. Thus, an adapter flange AU is also shown there, which allows support on the upper side of the screen basket 2B. These adapter struts 20 can be seen from the two representations in FIG. 5 a, with assignment to the upper screen basket flange 15 o, as an example. The rotor is designated 3A and the screen basket is designated A.The rotor 3A has a substantially cylindrical solid rotor body and rotor blades 13 attached thereto.FIG. 6 is a right-hand illustration of a sorter S1 with the details shown in FIG. 2. An area of the adapter A is drawn out to an enlarged scale, which has a process analysis unit with a data logger, a transmission unit and a power supply and which comprises, for example, a pressure sensor for the accept side, a pressure sensor for the inlet and a vibration sensor. To clarify the possible position of the process analysis unit, an assignment with the rotor 3A and the screen basket 2B and the rotor 3B is made clear, which are shown in FIG. 2. Also indicated schematically are an acceptance region and an inflow region in FIG. 6.FIGS. 7 aand 7 b show, in conjunction with FIG. 5, two different variants of a rotor 3A, 3B in conjunction with screen baskets 2A, 2B in rotor blades 13 shown in FIG. 5. FIG. 7 a relates to a drum construction with a cylindrical rotor 3A, 3B and rotor blades 13 are fixedly attached to the outer wall of the drum-shaped rotor body. Such a drum construction according to FIG. 7a is intended in particular for a high-consistency application.In FIG. 7 b, on the other hand, an open rotor construction is shown, which is intended for the low-consistency application. The rotor 3A, 3B comprises an open rotor construction having a centrally arranged rotor body to which the rotor blades 13 are attached by means of a rotor blade attachment. These rotor blades 13 also sweep over the inner surface of the screen element 2A, 2B, as illustrated in FIG. 7 a. This open rotor construction according to FIG. 7 bis intended in particular for a low-consistency application.The invention has been explained above with reference to preferred exemplary embodiments without any restriction to the embodiments shown therein. Of course, numerous variations or modifications are possible which the skilled person will make if necessary without departing from the essential inventive idea. In summary, this can be seen in that screen baskets 2A and 2B are arranged in a sorting housing 1 with an assignment to corresponding rotors 3A and 3B, wherein the screen baskets 2A and 2B have different diameters. For the subsequent installation, a construction is proposed which comprises an adapter A which fixedly connects the screen baskets 2A and 2B to one another, so that they are supported via the corresponding screen basket seats O and U, and the upper screen basket seat O and the lower screen basket seat U are fixedly predefined for a screen basket of uniform diameter during sorting S 1, as is known per se from the prior art.List of reference charactersS sorter as a whole in FIG. 1 Z inlet ZR inlet space Ak accept outlet R reject outlet 1 sorting housing 2 screen element 3 rotor 2A screen basket 2B screen basket 3A first rotor section 3B second rotor section 15 screen basket flange 15o upper screen basket flanges in FIG. 4 15u lower screen basket flanges in FIG. 4 16o upper screen basket flanges in FIG. 4 16u lower screen basket flanges in FIG. 4 20 adaptor struts in FIG. 5 LAU adaptor flange 13 rotor vanes in FIG. 5 M motor RS pulley in FIG. 2 LS central storage chair in FIG. 1 M 1 motor A1 pulley O upper screen basket seat U lower Screen basket seat BD Screen basket diameter AD Screen basket diameter of 2A BD Screen basket diameter of 2B ΔhA Screen basket height extension addition of the reference numerals with representation in FIG. 3 S2 Sorter overall A' Adapter AD' Upper screen basket diameter BD' Lower screen basket diameter 2A' Screen basket 2B' Screen basket 3A' Rotor 3B' Rotor 3B' RotorReferences included in the specificationThis list of documents cited by the applicant has been produced in an automated manner and is only included for the better information of the reader. The list is not part of the German patent application or utility model application. The DPMA does not take any adhesion for any faults or omissions.Patent Literature citedDE 38 31 845 C2

[0002] EP 3 533 925

[0012]

Claims

Sorter having a screen element of substantially rotationally symmetrical form, which is open at its two ends (inlet and outlet ends), and having a rotor which carries a sorting element and whose axis of rotation is equal to the axis of rotational symmetry, the screen elements having different diameters between the inlet end and the outlet end in order to maintain a differential speed between the sorting elements and the circumferential speed component of the material to be sorted as far as the outlet end, characterized in that at least two rotor regions (3A, 3A'; 3B, 3B') having different diameters and associated screen elements (2A, 2A'; which are matched in diameter in the axial direction; 2b, 2b'), and which are rigidly connected to one another in the axial direction via an adapter (A, A') between the two screen elements (2A, 2B; 2A', 2B').Sorter according to claim 1, characterized in that the rotor region (3A, 3A') on the inlet side has a smaller diameter and the rotor region (3B, 3B') on the outlet side has a larger diameter.Sorter according to one of claims 1 or 2, characterized in that the screen elements (2A, 2B; 2A', 2B') are designed as screen baskets.Sorter according to one of the preceding claims, characterized in that the rotor regions (3A, 3A'; 3B, 3B') are connected to a central, common drive (M1, A1, LS).Sorter according to one of the preceding claims, characterized in that the drive comprises a motor (M1), a belt pulley (A1) and a central storage chair (LS).Sorter according to one of the preceding claims, characterized in that the adapter (A, A') carries a process analysis unit with data logger, transmitter unit and energy supply, which comprises, for example, a pressure sensor for the accept side, a pressure sensor for the inlet and an oscillation sensor.Sorter according to one of the preceding claims, characterized in that the reduction in diameter of the screen elements (2A, 2B; 2A', 2B') is 3% to 35%, preferably 5% to 20%.Sorter according to claim 7, characterised in that the increase in the height of the screen element (2A, 2B, 2A', 2B') with simultaneous diameter reduction amounts to 0% to 30%, preferably 5% to 25%.Adapter for a sorter having the features of the preamble of claim 1, characterized in that the adapter (A, A') is designed in such a way that a two-part screen element (2A, 2B; 2A', 2B') is formed with assignment to the corresponding rotor regions (3A, 3B; 3A', 3B'), wherein the inflow-side screen element (2A, 2B; 2A', 2B') has a smaller diameter than the axially spaced outflow-side screen element.Adapter according to claim 9, characterised in that in the case of substantially cylindrical screen elements, preferably in the form of screen baskets (2A, 2B; 2A', 2B'), the adapter (A, A') corresponds with respect to its cross-sectional dimensions to the screen seat arrangement of the sorter (S1, S2).Adapter according to claim 9 or 10, characterised in that the adapter (A, A') carries a process analysis unit with a data logger, a transmitter unit and an energy supply, which comprises, for example, a pressure sensor for the accept side, a pressure sensor for the inlet and a vibration sensor.

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