Sorters and adapters for this

Abstract

Sorter with a sieve element of essentially rotationally symmetrical shape, open at both its ends (inlet and outlet) and with a sorting element-carrying rotor whose axis of rotation is the same as the axis of rotational symmetry, wherein the sieve elements have different diameters between the inlet and outlet in order to maintain a differential velocity between the sorting elements and the circumferential velocity component of the material to be sorted up to the outlet, characterized in that at least two rotor sections (3A, 3A'; 3B, 3B') with different diameters and associated diameter-matched sieve elements (2A, 2A'; 2B, 2B') are arranged in the axial direction, and are rigidly connected to each other in the axial direction via an adapter (A, A') between the two sieve elements (2A, 2B; 2A', 2B').

Description

[0001] The invention relates to a sorter with a sieve element of essentially rotationally symmetrical shape, which is open at both its ends (inlet and outlet) and with a sorting element-carrying rotor whose axis of rotation is the same as the axis of rotational symmetry, wherein the sieve elements have different diameters between the inlet and outlet ends in order to maintain a differential velocity between the sorting elements and the circumferential velocity component of the material to be sorted up to the outlet.

[0002] A sorter for fiber suspensions of the aforementioned type is known from DE 38 31 845 C2. This prior art also describes a sorter with a screen basket of essentially rotationally symmetrical shape, open at both its axial ends (inlet and outlet), and with a rotor carrying sorting vanes or sorting elements, the axis of rotation of which is the same as the axis of rotational symmetry. To reduce the circumferential velocity of the suspension to be sorted to a differential velocity between the sorting vanes or sorting elements and the suspension to be sorted, annular baffles extending radially from the circumference of the screen basket into the screen chamber are provided. Sorters from this prior art result in a complex and structurally very elaborate design of the internal area in conjunction with the sorting elements.In particular, the sorting elements and the sieve basket design must be coordinated with each other with regard to their shape. Such a design, as known from DE 38 31 845 C2, does not permit the retrofitting of existing, otherwise conventional sorters in which the sieve elements and the rotors have a uniform diameter from the inlet end to the outlet end in the axial direction.

[0003] CN 2 11 772 398 U describes an adapter for the upper screen basket seat. Installing this adapter allows the screen basket height to be increased while maintaining the same screen basket diameter. The aim is to increase the screen area to improve overall capacity or throughput. A reduction in rotor peripheral speed due to changes in the screen basket diameter is not intended.

[0004] CN 1 02 051 837 A describes a compound-type screen cylinder and a multi-stage pressure screen equipped with it. The screen cylinder comprises at least two screen cylinder units arranged sequentially along the axial direction, with the axial centerlines of different screen cylinder units coinciding; the inner diameters of the screen cylinder units increase continuously along the axial direction; the lower ends of the preceding stage of screen cylinder units are connected to the upper ends of the next stage of screen cylinder units by connecting pieces; the various screen cylinders connected by the connecting pieces can achieve the overall movement relative to a pressure screen tray; and fluid flow channels are arranged between two stages of screen cylinders. When used on the multi-stage screen, the screen cylinder offers the advantages of a simple structure and is easy to disassemble, clean, and maintain.Furthermore, the composite type screen cylinder can be assembled and disassembled as a whole, thus solving the problem of complex assembly and disassembly operations in the prior art when the screen cylinders are washed or serviced at the lower level.

[0005] DE 10 2018 005 307 B3 discloses a sieving device, in particular in the form of a sieve basket. Such sieving devices are used, for example, in sorting processes in the paper industry. Sieve slots or gaps are formed between adjacent profiled sieve bars. The sieve bars are received at their base in receiving recesses of support elements adapted to the base geometry and are permanently attached to these.

[0006] Here, the profile bars are arranged in such a way that, with a constant slot width between adjacent profile bars in the sieve basket axis direction, the profile depth increases from the material inlet side to the reject outlet side, and the diameter of the sieve device is larger on the material inlet side than on the reject outlet side.

[0007] The invention aims to design a sorter of the aforementioned type in such a way that rotors and screen elements with matching but different diameters can be inserted axially between the inlet and outlet ends, enabling sorters of conventional designs to achieve more effective sorting performance. The design effort is intended to allow the sorter to be converted back to the desired configuration at any time without significant modification. A key objective of the invention is therefore to achieve flexible reconfiguration of a sorter with minimal technical effort.

[0008] According to the invention, a sorter is provided with a sieve element of essentially rotationally symmetrical shape, which is open at both its ends (inlet and outlet) and with a sorting element-carrying rotor whose axis of rotation is the same as the axis of rotational symmetry, wherein the sieve elements have different diameters between the inlet and outlet ends in order to maintain a differential velocity between the sorting elements and the circumferential velocity component of the material to be sorted up to the outlet, which is characterized in that at least two rotor sections with different diameters and associated sieve elements adapted in diameter are arranged in the axial direction, and which are rigidly connected to each other in the axial direction via an adapter between the two sieve elements.

[0009] In the sorter solution according to the invention, the rotor speed in the inlet area is reduced by approximately 20% compared to the rotor speed at the outlet end, for example, in the reject area. This results in a reduction of the flow rate on the order of about 25%. The principle behind the invention lies in dividing the cylindrical rotor body into two parts, with 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 part of the sorter is reduced.To ensure that the diameter change of the rotor and the adjustment of the sieve elements correspond to the original dimensions of the sieve elements, for example, the sieve basket, with respect to the sieve element seats of the sorter, the invention provides an adapter that acts as an intermediate piece between the upper sieve element seat and the lower sieve element. This adapter is designed so that the sieve element seats at the inlet and outlet ends retain their usual, original size. This simple structural modification results in a corresponding energy saving.

[0010] Further preferred embodiments of the sorter according to the invention are described in claims 2-8. For example, the inlet-side rotor section has a smaller diameter and the outlet-side rotor section has a larger diameter. The screening elements can preferably be designed in the form of screen baskets.

[0011] Furthermore, to simplify the design, the rotor sections are connected by a central, common drive, thus eliminating the need for separate drives for each rotor section. This common drive comprises a motor, a pulley, and a central bearing assembly.

[0012] Preferably, the sorter is designed such that the adapter carries a process analysis unit with a data logger, transmitter, and power supply, which includes, for example, a pressure sensor for the receiving side, a pressure sensor for the infeed, and a vibration sensor. Thanks to the design of the adapter, sufficient installation space is available in the sorter according to the invention, allowing for the provision of a corresponding process analysis unit with data logger, transmitter, and power supply. This enables the easy acquisition of process analysis data, which can then provide the sorter operator with valuable information regarding the sorting process.

[0013] It has proven particularly advantageous in the sorter to reduce the diameter of the sieve elements by 3% to 35%, preferably 5% to 20%. Preferably, the height of the sieve element is increased while simultaneously reducing its diameter to 0% to 30%, preferably 5% to 25%. This change in sieve basket height (sieve cylinder height) is intended to compensate for the reduction in sieve basket area caused by the reduction in sieve element diameter, so that the overall capacity of the sieve element is not limited.

[0014] Furthermore, according to the invention, an adapter for a sorter of the type specified in the preamble of claim 1 is provided, which is designed in such a way that a two-part sieve element is formed in association with the corresponding rotor areas, wherein the inlet-side sieve element has a smaller diameter than the axially spaced outlet-side sieve element.

[0015] Preferably, the design is such that, in the case of essentially cylindrical sieve elements, preferably in the form of sieve baskets, the adapter corresponds to the sieve seat arrangement of the sorter with regard to its cross-sectional dimensions, so that no additional modifications to the sorter are required.

[0016] As already mentioned, thanks to the adapter according to the invention, sufficient installation space is provided so that a process analysis unit with a data logger, transmitter, and power supply can be integrated into the adapter. Such a process analysis unit includes, for example, a pressure sensor for the receiving side, a pressure sensor for the inlet, and a vibration sensor. These are, however, only examples for obtaining process analysis information and data. A process analysis unit of this type for monitoring the condition of a screen basket is known, for example, from EP 3 533 925 B21.

[0017] The invention is explained in more detail below with reference to the accompanying drawing and a non-limiting example. The drawing shows: Fig. 1 a schematic side view with sectional representation of a conventional sorter known per se, Fig. 2 a schematic overall view in partial sectional representation according to a preferred design according to the invention; Fig. 3 a corresponding view of an alternative embodiment of a sorter which operates according to the inflow principle; Fig. 4 a corresponding schematic sectional view to illustrate several details and arrangement of an adapter as well as its assignment to the usual seat dimensions or sieve seat dimensions of a sorter; Fig. 5 in conjunction with a sectional view along line AA a preferred arrangement and design of an adapter; Fig. 6 another embodiment of a sorter and adapter according to the invention similar to Fig. 3; Fig. Figure 7a schematically illustrates the rotor blades and the associated sieve elements; and Fig. 7b a Fig. 7a Similar view of an alternative embodiment, wherein the rotor blades are provided radially spaced from the rotor body.

[0018] The invention is explained in more detail below with reference to preferred embodiments and the accompanying drawing, without any limiting character.

[0019] Fig. Figure 1 shows a typical design of a sorter S, which has a sorting housing 1. Near the top of the sorting housing 1, an inlet Z for the material to be sorted is arranged, which opens into an inlet chamber ZR. At an axial distance from this, an acceptance outlet Ak and a rejection 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. Radially spaced from this is a rotor, designated 3. A drive unit for the rotor 3 comprises a drive motor M1, a pulley A1, and a central bearing LS. In this typical 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.

[0020] Fig. Figure 2 schematically shows a sorter according to the invention, designated S1 in its entirety. The same or similar parts as in Figure 2 are used. Fig. 1 are marked with the same reference symbols. The sorter S1 in Fig. Unlike the sorter S, 2 has a Fig. 1 in sorting housing 1 a two-part screen basket, namely a screen basket 2A and a screen basket S2B. The screen basket diameter AD of screen basket 2A is smaller than the screen basket diameter BD of screen basket 2B. Similarly, the rotor comprises a first rotor section 3A and a second rotor section 3B. These rotors 3A and 3B are radially adapted to the dimensions of screen baskets 2A and 2B. The rotor direction of rotation is in Fig. 2 marked with an arrow.

[0021] The sieve baskets 2A and 2B are rigidly connected to each other via an adapter A. Further details of this adapter are explained and illustrated in the following figures of the drawing. The adapter A is designed and constructed such that it rigidly connects the sieve baskets 2A and 2B, which have different diameters, such that the adapter A rests on the upper sieve basket seat O and is axially supported on the sorting housing 1 up to the beginning of the sieve basket 2B. The sieve basket 2B has a sieve basket diameter BD, which corresponds to a uniform sieve basket 2, for example, in Fig. 1 corresponds. Thus, adapter A forms an intermediate piece for screen basket 2A with the smaller screen basket diameter AD and screen basket 2B with the larger screen basket diameter BD. Screen basket 2B with screen basket diameter BD rests on the otherwise standard lower screen basket seat U. As a drive unit for rotors 3A and 3B, as in the prior art according to Fig. 1 A single motor M is provided, which drives the two rotors 3A and 3B via a pulley RS and a central bearing LS in the position indicated by an arrow. Fig. 2 registered directions of rotation.

[0022] The design according to the invention allows the rotational speed between the two rotor bodies 3A and 3B to be decoupled and varied. The rotor body 3A facing the inlet chamber ZR can thus be operated at a lower speed, resulting in significant energy savings. In particular, technological simplification is achieved, the complexity of the design is reduced, and costs can be optimized. With the design according to the invention, the rotor speed of rotor 3A in the inlet chamber ZR can be significantly reduced compared to 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, with the screen basket diameter AD being reduced in the upper region.In order to make it possible to utilize this diameter change of the rotor 3A and the corresponding adjustment of the sieve basket 2A using the usual sieve basket seats O and U, the adapter A is provided as an intermediate piece between the upper sieve basket seat O and the lower sieve basket seat U.

[0023] As shown in the illustration Fig. As can be seen in Figure 2, adapter A does not alter the installation seats, screen basket seat O and screen basket seat U, which are designed for standard one-piece screen baskets. This means that no significant structural modification of screen basket seats U and O is required when using adapter A. To compensate for the reduction in diameter of the upper screen basket 2A, its height is increased by ΔhA in the axial direction. Therefore, the upper adapter flange of adapter A expediently has a conical design. This also ensures that the acceptor flow can be discharged unimpeded via the acceptor outlet Ak. For stability reasons, in the acceptor area near the acceptor outlet Ak, adapter A is designed as a support structure, which may include tension struts or, for example, a perforated support sleeve (backup cylinder).Therefore, this solution according to the invention with adapter A is particularly suitable for subsequent installation in a conventional sorter that is known per se, which is used, for example, in . Fig. 1 is labelled with S.

[0024] Adapter A includes, for example, accept-side struts for force absorption and compensation of the bending moments occurring in the sieve basket seats O and U.

[0025] Fig. Figure 3 shows a sorter S2, as it differs from the previous case in Fig. The sorter S1 described in section 2 operates according to the inflow principle. This means that in the infeed chamber ZR of the sorter S2, the material flow within the sorting housing 1 is directed from the outside inwards. Therefore, the rotors 3A' and 3B' are arranged radially outwards with the screen baskets 2A' and 2B'. Consequently, the adapter A' is provided as an intermediate piece to support the screen basket 2A' over the screen basket 2B'. Thus, the position of the adapter A' differs from the position of the adapter A in section 2. Fig. 2. The upper sieve basket diameter is designated AD' and the lower sieve basket diameter BD'. All to Fig. Two identical or similar parts are marked with the same reference numerals.

[0026] The only remaining difference to note is that adapter A' provides 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 positioned radially inwards relative to rotors 3A and 3B'. The respective screen basket diameters are shown in Fig. 3 designated by AD' and BD', where the sieve basket with sieve basket diameter AD' is assigned to rotor 3A', while the sieve basket diameter BD' is assigned to rotor 3B'.

[0027] Fig. Figure 4 is an enlarged view of the details of Fig. Figure 2 illustrates the arrangement of adapter A. Adapter A rests on the upper screen basket seat O and is designed and configured to axially support screen basket 2A, which has a smaller diameter, by increasing its height by ΔhA. At the end of screen basket 2A, adapter A, via the larger-diameter screen basket 2B, provides support on the lower screen basket seat U of the sorter S1. This support is provided by adapter A via the respective screen basket flanges, which are supported like the upper and lower screen basket flanges 15o and 15u, as well as 16o and 16u. Identical or similar parts as in Fig. 2 are in Fig. 4 with the same reference symbols.

[0028] Fig. Figure 5 includes a side view and a sectional view along line AA. In this illustration, the struts of adapter A are shown with solid lines. An adapter flange AU is also shown, which provides support on the upper side of the sieve basket 2B. These adapter struts 20 can be identified from the two illustrations in Figure 5. Fig. 5a is shown under the assignment to the upper screen basket flange 15o as an example. The rotor is labelled 3A and the screen basket A.

[0029] The rotor 3A has an essentially cylindrical solid rotor body and rotor blades 13 attached to it.

[0030] Fig. In the right-hand diagram, 6 goes from a sorter S1 with the in Fig. The details shown in Figure 2 are detailed below. An enlarged section of adapter A is highlighted, which includes a process analysis unit with a data logger, a transmitter, and a power supply, and comprises, for example, a pressure sensor for the receiving side, a pressure sensor for the inlet, and a vibration sensor. To clarify the approximate location of the process analysis unit, its relationship to rotor 3A, screen basket 2B, and rotor 3B is shown, as illustrated in Figure 2. Fig. Figure 2 shows the following. An acceptance area and an inflow area are also schematically indicated. Fig. 6 entered.

[0031] The Fig. 7a and Fig. 7b show in conjunction with Fig. 5 two different design variants of a rotor 3A, 3B in conjunction with sieve baskets 2A, 2B in the Fig. 5 rotor blades shown 13. Fig. 7a refers 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 specifically intended for high consistency applications.

[0032] In Fig. Figure 7b, on the other hand, shows an open rotor design intended for low-consistency applications. Rotor 3A, 3B comprises an open rotor design with a centrally located rotor body to which the rotor blades 13 are attached by means of a blade attachment. These rotor blades 13 also sweep out, as in Fig. Figure 7a illustrates the inner surface of the sieve element 2A, 2B. This open rotor design according to Fig. 7b is specifically intended for low-consistency applications.

[0033] The invention has been explained above with reference to preferred embodiments without any limitation to the embodiments shown therein. Of course, numerous modifications or alterations are possible, which a person skilled in the art will make as needed without departing from the essential concept of the invention. This can be summarized as follows: in a sorting housing 1, sieve baskets 2A and 2B are arranged in association with corresponding rotors 3A and 3B, wherein the sieve baskets 2A and 2B have different diameters.For subsequent installation, a construction is proposed which includes an adapter A which firmly connects the sieve baskets 2A and 2B to each other, so that they are supported via the corresponding sieve basket seats O and U, and the upper sieve basket seat O and the lower sieve basket seat U are fixed for a sieve basket of uniform diameter during sorting S1, as is known from the prior art. Reference symbol list S sorter total in Fig. 1 Z Inlet ZR Inlet area Ak Acceptance outlet R Reject outlet 1 sorting housing 2 sieve element 3 Rotor 2A sieve basket 2B sieve basket 3A first rotor section 3B second rotor section 15 sieve basket flange 150 upper strainer basket flanges in Fig. 4 15u lower strainer basket flanges in Fig. 4 160 upper strainer basket flanges in Fig. 4 16u lower strainer basket flanges in Fig. 4 20 adapter struts in Fig. 5 LAU adapter flange 13 rotor blades in Fig. 5 M Motor RS pulley in Fig. 2 LS central storage chair in Fig. 1 M1 engine A1 pulley O upper sieve basket seat U lower sieve basket seat BD sieve basket diameter AD sieve basket diameter of 2A BD sieve basket diameter of 2B ΔhA sieve basket height extension Supplement to the reference symbols with representation in Fig. 3 S2 sorter total A' Adapter AD' upper sieve basket diameter BD' lower sieve basket diameter 2A' sieve basket 2B' sieve basket 3A' Rotor 3B' Rotor

Claims

[1] Sorter with a screen element of substantially rotationally symmetrical shape, open at both its ends (inlet and outlet) and with a rotor carrying a sorting element, the axis of rotation being the same as the axis of rotational symmetry, wherein the screen elements have different diameters between the inlet and outlet in order to maintain a differential velocity between the sorting elements and the circumferential velocity component of the material to be sorted up to the outlet, characterized by , that in the axial direction at least two rotor areas (3A, 3A'; 3B, 3B') with different diameters and associated sieve elements adapted in diameter (2A, 2A'; 2B, 2B') are arranged, and which are rigidly connected to each other in the axial direction via an adapter (A, A') between the two sieve elements (2A, 2B; 2A', 2B'). [2] Sorter according to claim 1, characterized by, that the inlet-side rotor area (3A, 3A') has a smaller diameter and the outlet-side rotor area (3B, 3B') has a larger diameter. [3] Sorter according to one of claims 1 or 2, characterized by , that the sieve elements (2A, 2B; 2A', 2B') are designed as sieve baskets. [4] Sorter according to any of the preceding claims, characterized by , that the rotor areas (3A, 3A'; 3B, 3B') are connected to a central, common drive (M1, A1, LS). [5] Sorter according to any of the preceding claims, characterized by , that the drive comprises a motor (M1), a pulley (A1) and a central bearing seat (LS). [6] Sorter according to any of the preceding claims, characterized by , that the adapter (A, A') carries a process analysis unit with data logger, transmitter unit and power supply, which includes, for example, a pressure sensor for the accept side, a pressure sensor for the inlet and a vibration sensor. [7] Sorter according to any of the preceding claims, characterized by , that the diameter reduction of the sieve elements (2A, 2B; 2A', 2B') is 3% to 35%, preferably 5% to 20%. [8] Sorter according to claim 7, characterized by , that the increase in the height of the sieve element (2A, 2B, 2A', 2B') while simultaneously reducing the diameter amounts to 0% to 30%, preferably 5% to 25%. [9] Adapter for a sorter having the features of the preamble of claim 1, characterized by , that the adapter (A, A') is designed such that a two-part sieve element (2A, 2B; 2A', 2B') is formed by assigning it to the corresponding rotor areas (3A, 3B; 3A', 3B'), wherein the inlet-side sieve element (2A, 2B; 2A', 2B') has a smaller diameter than the axially spaced outlet-side sieve element. [10] Adapter according to claim 9, characterized by, that in the case of essentially cylindrical sieve elements, preferably in the form of sieve baskets (2A, 2B; 2A', 2B') the adapter (A, A') corresponds with regard to its cross-sectional dimensions to the sieve seat arrangement of the sorter (S1, S2). [11] Adapter according to claim 9 or 10, characterized by , that the adapter (A, A') carries a process analysis unit with data logger, transmitter unit and power supply, which includes, for example, a pressure sensor for the accept side, a pressure sensor for the inlet and a vibration sensor.

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