EP4048450A1 - Screening cylinder - Google Patents

Screening cylinder

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Publication number
EP4048450A1
EP4048450A1 EP20786508.0A EP20786508A EP4048450A1 EP 4048450 A1 EP4048450 A1 EP 4048450A1 EP 20786508 A EP20786508 A EP 20786508A EP 4048450 A1 EP4048450 A1 EP 4048450A1
Authority
EP
European Patent Office
Prior art keywords
end ring
ring
profile
screening device
profile bars
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP20786508.0A
Other languages
German (de)
French (fr)
Other versions
EP4048450B1 (en
Inventor
Jürgen Futterer
Gert Gottschalk
Roberto Masala
Klaus-Herbert Wiese
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP4048450A1 publication Critical patent/EP4048450A1/en
Application granted granted Critical
Publication of EP4048450B1 publication Critical patent/EP4048450B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/18—Drum screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/12—Apparatus having only parallel elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • B07B1/4609—Constructional details of screens in general; Cleaning or heating of screens constructional details of screening surfaces or meshes
    • B07B1/4618—Manufacturing of screening surfaces

Definitions

  • the invention relates to a cylindrical screening device with a large number of profile bars, in which several ring-shaped, spaced-apart rod holders extending perpendicular to the cylinder axis or spaced-apart packages of several rod holders are provided on the inside or outside with open-edged recesses, the shape of which corresponds to the rod feet of the profile bars essentially complementary and in which the profile bars are inserted into the recesses parallel to one another and parallel to the cylinder axis, an outer bar holder being arranged in the region of a respective end ring of the screening device.
  • cylindrical screening devices of this type is the sorting of pulp suspensions, as is carried out in pressure sorters in the paper manufacturing industry.
  • the fibers contained in the suspension should pass through the sieve, while the unwanted solid constituents are rejected at the gap and passed out of the sieve device again.
  • the openings have an essentially elongated shape, that is to say slits or gaps, fibrous particles are passed through more easily than the cubic ones, even if both types should be of a similar size.
  • DE 10 2006 007 660 A1 shows a possible method for producing such screen baskets, in which the profile bars are clamped in by plastic deformation of the c-shaped butterfly rings provided with recesses for the bars. Particularly suitable profile bars are used for such manufacturing processes. With the help of this process it was possible to make the production considerably cheaper.
  • the method is used for sieve baskets in which the rods on the inner edge of the Retaining rings are used. Such an arrangement of the rods is chosen if the suspension is to pass through the slots from the inside to the outside (centrifugal mode of operation). To reshape the retaining rings, bending forces are introduced from the outside at the joint ends, with the joint ends being supported on the inside on support rollers.
  • EP 31 43 198 A1 describes a sieve device in which the retaining rings are each formed by a rod holder package made up of several rod holders. When the rod holder packs are bent into rings, the profile rods are clamped in the recesses because of the different positions of the neutral fibers in the rod holders of a rod holder pack.
  • the object of the invention is therefore to simplify the attachment of the end rings.
  • the object was achieved in that at least the respective outer rod holder is releasably connected to the end ring. This eliminates the problem of welding the end rings on, which is particularly problematic with regard to additional stresses. This also makes it possible to reuse the end rings.
  • the invention can also be used in sieve devices with rod holder packages, at least the outer rod holder, several or all rod holders of the rod holder package being detachably connected to the end ring.
  • the detachable connection is particularly simple if it is designed as a screw connection.
  • one or more profile rods should be profiled on the radial outer or inner circumference in the area of the respective end ring and the contact area of the end ring opposite this profile should be complementary.
  • the respective end ring comprises a blocking ring arranged perpendicular to the cylinder axis, one or more profile bars are profiled on the radial outer or inner circumference in the area of the respective blocking ring and the contact area opposite this profile of the blocking ring is shaped complementary to this.
  • the blocking ring To stabilize the position of the blocking ring, it should be axially fixed on the end ring or between the end ring and the outer rod holder.
  • the blocking ring is designed as an annular wire or an annular disk.
  • the profiling of the profile bars should be designed, regardless of the type of axial position fixation, so that the interaction with the opposite, complementary profile limits the axial free space for an axial displacement of the profile bars or does not exist.
  • This form-fit connection, direct or indirect via the blocker ring, between the profile rods and the respective end ring also increases the axial load-bearing capacity of the connection between the end ring and the screening device.
  • the end ring is constructed in several parts.
  • the fixation of the profile rods in the other rod holders can advantageously take place in that the rod holders are deformed by forces acting radially from the outside on the rod holders and / or the profile rods until the profile rods are permanently interlocked in the recesses of these rod holders.
  • the profile bars must be fixed in the recesses of the bar holders by welding, gluing or the like.
  • FIG. 1 a schematic view of a cylindrical screen basket
  • FIG. 2 a schematic cross section through this with punches 8;
  • FIGS. 4a + b different cross-sections through an end ring 6 with an outer bar holder 5 and blocking ring 9.
  • the rod holders 3, 5 are produced as one-piece rings, for example by means of laser cutting. This is the basis for a high dimensional accuracy of the screen basket.
  • the bar holders 3, 5, as can be seen in FIGS. 1 and 2, have a large number of evenly distributed recesses 4 for the profile bars 1. These According to FIG. 3a, recesses 4 offer sufficient play so that the profile bars 1 can be pushed axially through them without any problems.
  • the screen basket prefabricated in this way consists of profile bars 1 running parallel to the cylinder axis 2, which are held by several bar holders 3, 5 running perpendicular to the cylinder axis 2.
  • FIG. 4b While in FIG. 4b several axially spaced rod holders 3, 5 are provided for example, in FIG. 4a a plurality of axially spaced packs with two rod holders 3, 5 each are used.
  • the screen openings of the screen basket are formed by the slots in adjacent profile bars 1.
  • such slots often have a width between 0.05 and 2 mm.
  • the radial force effect is realized by several punches 8, which are arranged radially evenly distributed over the cylinder circumference and which act radially from the outside directly on the rod holders 3, 5 and are directed in particular towards the cylinder axis 2 of the preassembled screen basket.
  • the punches 8 of adjacent rod holders 3, arranged axially next to one another, can also be designed as a common punch 8.
  • the pressing surface of all punches 8 pointing in the pressing direction is each formed by a segment of a circle, the radius of which corresponds to the outer radius of the sieve device after the pressing process. Since the outer radius of the sieve device formed by the rod holders 3 is slightly larger before the pressing process than afterwards, there is a small amount of play between the rod holders 3 and the pressing surface in the central part of the punch 8 at the beginning of the pressing process. This play can be accepted at the start of pressing and the associated lower pressing forces and decreases as the pressing progresses.
  • the deformation takes place very gently and evenly, so that there is no overstressing of the rod holders 3.5.
  • An additional fastening of the profile bars 1 can generally be dispensed with.
  • the punches 8 are guided axially and radially in guide grooves.
  • the radial force leads to a reduction in the diameter of the force-loaded rod holders 3.5 and a plastic deformation of the rod holders 3.5 in the area of the recesses 4, in the result of which is the space between the profile bar 1 and bar holder 3.5, as shown in Figure 3b, is closed.
  • An end ring 6 is located adjacent to an outer rod holder 5 at each of the two end faces of the sieve device.
  • end rings 6 are detachably connected in FIG. 4b to the axially outer rod holder 5 and in FIG. 4a to the axially outer package comprising the outer 5 and an adjacent axially inner 3 rod holder by means of a screw connection 10.
  • This screw connection 10 takes place via several screws evenly distributed over the circumference of the end ring 6 and is very resilient, which, for example, allows the sieve device to be lifted over an end ring 6.
  • welding and corresponding post-processing can be dispensed with.
  • the respective end ring 6 comprises a blocking ring 9 arranged perpendicular to the cylinder axis 2.
  • This blocking ring 9 is designed as an annular wire with a circular cross-section in FIG. 4a and as an annular disk in FIG. 4b.
  • the axial position of the blocking ring 9 is fixed in both cases by clamping a radially outer one Section of the blocking ring 9 between the end ring 6 and the adjacent outer rod holder 5.
  • the profile bars 1 are profiled here on the radial outer circumference in the area of the respective blocking ring 9, the contact area of the blocking ring 9 opposite this profile 11 being shaped complementary thereto.
  • the profile 11 is designed in such a way that, in cooperation with the complementary contact area, a relative displacement between the profile rod 1 and the blocking ring 9 is prevented.
  • the end ring 6 can be divided in the radial, axial or circumferential direction.
  • the detachable attachment of the end rings 6 to the outer rod holder 5 or the outer rod holder package can take place regardless of whether the rod holders 5 have their recesses 4, as here, on the inside or on the outside.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Paper (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)

Abstract

The invention relates to a cylindrical screening device comprising a plurality of profile bars (1), in which a plurality of annular bar holders (3, 5) extending perpendicular to the cylinder axis (2) and spaced apart from one another, or packs of bar holders (3, 5) spaced apart from one another, are provided on the inside or outside with open-edged recesses (4), the shape of which corresponds in a substantially complementary manner to that of the feet of the profile bars (1), and the profile bars (1) are inserted, parallel to one another and parallel to the cylinder axis (2), into the recesses (4), an outer bar holder (5) in being arranged in the region of each end ring (6) of the screening device. The fastening of the end ring (6) should be simplified by at least releasably connecting each outer bar holder (5) to the relevant end ring (6).

Description

Siebzylinder Screen cylinder
Die Erfindung betrifft eine zylindrische Siebvorrichtung mit einer Vielzahl von Profilstäben, bei der mehrere ringförmige, senkrecht zur Zylinderachse verlaufende und voneinander beabstandete Stabhalter oder voneinander beabstandete Pakete von mehreren Stabhaltern an der Innen- oder Außenseite mit randoffenen Aussparungen versehen sind, deren Form den Stabfüßen der Profilstäbe im Wesentlichen komplementär entspricht und bei der die Profilstäbe parallel zueinander und parallel zur Zylinderachse in die Aussparungen eingesetzt sind, wobei jeweils ein äußerer Stabhalter im Bereich eines jeweiligen stirnseitigen Endringes der Siebvorrichtung angeordnet ist. The invention relates to a cylindrical screening device with a large number of profile bars, in which several ring-shaped, spaced-apart rod holders extending perpendicular to the cylinder axis or spaced-apart packages of several rod holders are provided on the inside or outside with open-edged recesses, the shape of which corresponds to the rod feet of the profile bars essentially complementary and in which the profile bars are inserted into the recesses parallel to one another and parallel to the cylinder axis, an outer bar holder being arranged in the region of a respective end ring of the screening device.
Ein bekanntes Beispiel für den Einsatz von zylindrischen Siebvorrichtungen dieser Art ist das Sortieren von Faserstoffsuspensionen, wie es in Drucksortierern der papiererzeugenden Industrie durchgeführt wird. A well-known example of the use of cylindrical screening devices of this type is the sorting of pulp suspensions, as is carried out in pressure sorters in the paper manufacturing industry.
Dabei sollen die in der Suspension enthaltenen Fasern durch das Sieb hindurch treten, während die nicht gewünschten festen Bestandteile an dem Spalt abgewiesen und aus der Siebvorrichtung wieder herausgeleitet werden. The fibers contained in the suspension should pass through the sieve, while the unwanted solid constituents are rejected at the gap and passed out of the sieve device again.
Dadurch, dass die Öffnungen eine im Wesentlichen längliche Form haben, also Schlitze oder Spalten sind, werden faserige Teilchen leichter durchgelassen als die kubischen, auch wenn beide Arten in ähnlicher Größenordnung vorliegen sollten. Because the openings have an essentially elongated shape, that is to say slits or gaps, fibrous particles are passed through more easily than the cubic ones, even if both types should be of a similar size.
Mit einer derartigen Sortiertechnologie ist daher ein sehr guter Ausscheidungseffekt von nicht faserigen Störstoffen aus Faserstoffsuspensionen möglich. With such a sorting technology, a very good elimination effect of non-fibrous contaminants from fibrous material suspensions is therefore possible.
Denkbar ist auch ein Einsatz zur Trennung unterschiedlicher Faserbestandteile, der sogenannten Faserfraktionierung. Voraussetzung ist allerdings eine hohe Präzision der Schlitzform auf der ganzen Siebfläche. It is also conceivable to use it to separate different fiber components, so-called fiber fractionation. A prerequisite, however, is a high level of precision of the slot shape over the entire screen surface.
Ein mögliches Verfahren, um solche Siebkörbe herzustellen, zeigt die DE 10 2006 007 660 A1 , bei der die Profilstäbe durch plastisches Verformen der mit Vertiefungen für die Stäbe vorgesehenen c-förmigen Flalteringe eingeklemmt werden. Flierzu werden für derartige Herstellungsverfahren besonders geeignete Profilstäbe verwendet. Mit Hilfe dieses Verfahrens gelang es, die Herstellung wesentlich zu verbilligen. Das Verfahren wird bei Siebkörben verwendet, bei denen die Stäbe am Innenrand der Halteringe eingesetzt werden. Eine solche Anordnung der Stäbe wird gewählt, wenn die Suspension von innen nach außen die Schlitze passieren soll (zentrifugale Fahrweise). Zur Umformung der Halteringe werden an den Stoßenden von außen Biegekräfte eingeleitet, wobei sich die Stoßenden auf der Innenseite auf Stützwalzen abstützen. DE 10 2006 007 660 A1 shows a possible method for producing such screen baskets, in which the profile bars are clamped in by plastic deformation of the c-shaped butterfly rings provided with recesses for the bars. Particularly suitable profile bars are used for such manufacturing processes. With the help of this process it was possible to make the production considerably cheaper. The method is used for sieve baskets in which the rods on the inner edge of the Retaining rings are used. Such an arrangement of the rods is chosen if the suspension is to pass through the slots from the inside to the outside (centrifugal mode of operation). To reshape the retaining rings, bending forces are introduced from the outside at the joint ends, with the joint ends being supported on the inside on support rollers.
In der EP 31 43 198 A1 wird eine Siebvorrichtung beschrieben, bei der die Halteringe jeweils von einem Stabhalterpaket aus mehreren Stabhaltern gebildet wird. Beim Umbiegen der Stabhalterpakete zu Ringen kommt es wegen der unterschiedlichen Lage der neutralen Faser der Stabhalter eines Stabhalterpaketes zur Klemmung der Profilstäbe in den Aussparungen. EP 31 43 198 A1 describes a sieve device in which the retaining rings are each formed by a rod holder package made up of several rod holders. When the rod holder packs are bent into rings, the profile rods are clamped in the recesses because of the different positions of the neutral fibers in the rod holders of a rod holder pack.
Wichtig ist, dass die Dimensionen der Sieböffnungen mit sehr geringen Toleranzen eingehalten werden. Um sie von Verstopfungen frei zu halten, sind zumeist Räumer erforderlich, die in geringem Abstand an der Siebfläche vorbei bewegt werden und die hydraulische Impulse erzeugen. Siebvorrichtungen für den Einsatz in Drucksortierern müssen daher sehr präzise gefertigt sein und hohen Belastungen standhalten. It is important that the dimensions of the sieve openings are adhered to with very low tolerances. In order to keep them free from blockages, scrapers are usually required, which are moved past the sieve surface at a short distance and which generate hydraulic impulses. Screening devices for use in pressure sorters must therefore be manufactured very precisely and withstand high loads.
Ein weiteres Problem bei den bisher bekannten Siebvorrichtungen ergibt sich im Zusammenhang mit der Anbindung der Endringe der Siebvorrichtungen bzw. Siebkörbe, und zwar unabhängig davon, ob die Profilstäbe mit den Stabhaltern verschweißt werden oder nicht. So wirkt die Hauptbelastung beim Betrieb des Sortierers am stärksten im Bereich der Endring-Schweißnaht, da hier der Kraftum lenkpunkt mit der höchsten Spannungsbelastung vorliegt. Auch dies stellt eine permanente Schwachstelle dar, was immer wieder dazu führt, dass die Endringe an dieser Stelle von den Siebzylindern abbrechen. Die Ursache hierfür ist ebenfalls im Schweißprozess begründet. Another problem with the previously known screening devices arises in connection with the connection of the end rings of the screening devices or screen baskets, regardless of whether the profile rods are welded to the rod holders or not. When the sorter is in operation, the main load acts most strongly in the area of the end ring weld seam, since this is where the force deflection point with the highest stress load is present. This also represents a permanent weak point, which repeatedly leads to the end rings breaking off the screen cylinders at this point. The reason for this is also due to the welding process.
Darüber hinaus muss beim Anschweißen der Endringe starken Schrumpfspannungen entgegengewirkt werden. Die Siebschlitze in unmittelbarer Nähe zur Schweißnaht verziehen sich. Anlassfarben müssen aufwendig abgeschliffen werden. In addition, strong shrinkage stresses must be counteracted when welding the end rings. The sieve slots in the immediate vicinity of the weld seam become distorted. Annealing colors have to be sanded off in a laborious manner.
Die Aufgabe der Erfindung ist es daher die Befestigung der Endringe zu vereinfachen. The object of the invention is therefore to simplify the attachment of the end rings.
Erfindungsgemäß wurde die Aufgabe dadurch gelöst, dass zumindest der jeweilige, äußere Stabhalter mit dem Endring lösbar verbunden ist. Damit entfällt das besonders hinsichtlich zusätzlicher Spannungen problematische Anschweißen der Endringe. Außerdem ergibt sich hierdurch die Möglichkeit die Endringe wiederzuverwenden. According to the invention, the object was achieved in that at least the respective outer rod holder is releasably connected to the end ring. This eliminates the problem of welding the end rings on, which is particularly problematic with regard to additional stresses. This also makes it possible to reuse the end rings.
Anwendbar ist die Erfindung auch bei Siebvorrichtungen mit Stabhalterpaketen, wobei zumindest der äußere Stabhalter, mehrere oder alle Stabhalter des Stabhalter-Paketes mit dem Endring lösbar verbunden sind. The invention can also be used in sieve devices with rod holder packages, at least the outer rod holder, several or all rod holders of the rod holder package being detachably connected to the end ring.
Besonders einfach gestaltet sich die lösbare Verbindung, wenn diese als Verschraubung ausgeführt ist. The detachable connection is particularly simple if it is designed as a screw connection.
Um ein axiales Verschieben der Profilstäbe in den Aussparungen der Stabhalter zu verhindern, sollten ein oder mehrere Profilstäbe am radialen Außen- oder Innenumfang im Bereich des jeweiligen Endrings profiliert ausgebildet und der diesem Profil jeweils gegenüberliegende Kontakt-Bereich des Endrings dazu komplementär ausgeformt sein. To prevent axial displacement of the profile rods in the recesses of the rod holder, one or more profile rods should be profiled on the radial outer or inner circumference in the area of the respective end ring and the contact area of the end ring opposite this profile should be complementary.
Alternativ oder ergänzend kann es aber hierzu ebenso vorteilhaft sein, wenn der jeweilige Endring einen senkrecht zur Zylinderachse angeordneten Blockierring umfasst, ein oder mehrere Profilstäbe am radialen Außen- oder Innenumfang im Bereich des jeweiligen Blockierrings profiliert ausgebildet sind und der diesem Profil jeweils gegenüberliegende Kontakt-Bereich des Blockierrings dazu komplementär ausgeformt ist. Alternatively or additionally, however, it can also be advantageous if the respective end ring comprises a blocking ring arranged perpendicular to the cylinder axis, one or more profile bars are profiled on the radial outer or inner circumference in the area of the respective blocking ring and the contact area opposite this profile of the blocking ring is shaped complementary to this.
Zur Stabilisierung der Lage des Blockierrings sollte dieser am Endring oder zwischen dem Endring und dem äußeren Stabhalter axial fixiert werden. To stabilize the position of the blocking ring, it should be axially fixed on the end ring or between the end ring and the outer rod holder.
Einfach und wirkungsvoll ist es dabei, wenn der Blockierring als ringförmiger Draht oder als ringförmige Scheibe ausgebildet ist. It is simple and effective when the blocking ring is designed as an annular wire or an annular disk.
Die Profilierung der Profilstäbe sollte unabhängig von der Art der axialen Lagefixierung so ausgeführt sein, dass durch das Zusammenwirken mit der gegenüberliegenden, komplementären Profilierung der axiale Freiraum für ein axiales Verschieben der Profilstäbe eingeschränkt oder nicht vorhanden ist. Dieser direkte oder über den Blockerring indirekte Formschluss zwischen den Profilstäben und dem jeweiligen Endring steigert auch die axiale Belastbarkeit der Verbindung zwischen dem Endring und der Siebvorrichtung. The profiling of the profile bars should be designed, regardless of the type of axial position fixation, so that the interaction with the opposite, complementary profile limits the axial free space for an axial displacement of the profile bars or does not exist. This form-fit connection, direct or indirect via the blocker ring, between the profile rods and the respective end ring also increases the axial load-bearing capacity of the connection between the end ring and the screening device.
Für die Montage des Endrings aber auch die Unterbringung des Blockierrings im oder am Endring kann es von Vorteil sein, wenn der Endring mehrteilig ausgebildet ist. For the assembly of the end ring but also the accommodation of the blocking ring in or on the end ring, it can be advantageous if the end ring is constructed in several parts.
Die Fixierung der Profilstäbe in den anderen Stabhaltern kann mit Vorteil dadurch erfolgen, dass die Stabhalter über radial von außen auf die Stabhalter und/oder die Profilstäbe einwirkende Kräfte bis zum dauerhaften Formschluss der Profilstäbe in den Aussparungen dieser Stabhalter verformt werden. The fixation of the profile rods in the other rod holders can advantageously take place in that the rod holders are deformed by forces acting radially from the outside on the rod holders and / or the profile rods until the profile rods are permanently interlocked in the recesses of these rod holders.
Da die Stabhalter bereits als Ring vorliegen und oft einstückig ausgeführt sind, vereinfacht sich die Fierstellung wesentlich. Neben einer exakten zylindrischen Form ergibt sich dadurch eine hohe Genauigkeit bei den Aussparungen und damit auch den Sieböffnungen. Since the rod holders are already in the form of a ring and are often made in one piece, the freeing position is considerably simplified. In addition to an exact cylindrical shape, this results in a high degree of accuracy in the recesses and thus also in the sieve openings.
In vielen Fällen kann es genügen, wenn die Fixierung der Profilstäbe in den Aussparungen der Stabhalter ausschließlich über eine Klemmung erfolgt. In many cases it can be sufficient if the profile bars are fixed in the recesses of the bar holders exclusively by means of a clamp.
Sollte dies nicht genügen, so müssen die Profilstäbe jedoch in den Aussparungen der Stabhalter durch Schweißen, Kleben o.ä. fixiert werden. If this is not sufficient, however, the profile bars must be fixed in the recesses of the bar holders by welding, gluing or the like.
Nachfolgend soll die Erfindung an einem Ausführungsbeispiel näher erläutert werden.The invention will be explained in more detail below using an exemplary embodiment.
In der beigefügten Zeichnung zeigt: In the attached drawing shows:
Figur 1: eine schematische Ansicht eines zylindrischen Siebkorbes; FIG. 1: a schematic view of a cylindrical screen basket;
Figur 2: einen schematischen Querschnitt durch diesen mit Stempeln 8; FIG. 2: a schematic cross section through this with punches 8;
Figur 3a+b: die Aussparung 4 mit Profilstab 1 vor und nach dem radialen Drücken und Figur 4a+b: verschiedene Querschnitt durch einen Endring 6 mit äußerem Stabhalter 5 und Blockierrring 9. 3a + b: the recess 4 with the profile bar 1 before and after the radial pressing and FIGS. 4a + b: different cross-sections through an end ring 6 with an outer bar holder 5 and blocking ring 9.
Die Stabhalter 3,5 werden als einstückige Ringe beispielsweise mittels Laserschneiden hergestellt. Dies ist die Grundlage für eine hohe Formgenauigkeit des Siebkorbes. The rod holders 3, 5 are produced as one-piece rings, for example by means of laser cutting. This is the basis for a high dimensional accuracy of the screen basket.
Auf der Innenseite besitzen die Stabhalter 3,5, wie in Figur 1 und 2 zu erkennen, eine Vielzahl gleichmäßig verteilt angeordneter Aussparungen 4 für die Profilstäbe 1. Diese Aussparungen 4 bieten gemäß Figur 3a ausreichend Spiel, so dass die Profilstäbe 1 problemlos axial durch diese geschoben werden können. On the inside, the bar holders 3, 5, as can be seen in FIGS. 1 and 2, have a large number of evenly distributed recesses 4 for the profile bars 1. These According to FIG. 3a, recesses 4 offer sufficient play so that the profile bars 1 can be pushed axially through them without any problems.
Im Ergebnis besteht der so vorgefertigte Siebkorb aus parallel zur Zylinderachse 2 verlaufenden Profilstäben 1, die über mehrere, senkrecht zur Zylinderachse 2 verlaufende Stabhalter 3,5 gehalten werden. As a result, the screen basket prefabricated in this way consists of profile bars 1 running parallel to the cylinder axis 2, which are held by several bar holders 3, 5 running perpendicular to the cylinder axis 2.
Während bei Figur 4b beispielhaft mehrere, axial voneinander beabstandete Stabhalter 3,5 vorgesehen sind, kommen bei Figur 4a mehrere, axial voneinander beabstandete Pakete mit je zwei Stabhaltern 3,5 zum Einsatz. While in FIG. 4b several axially spaced rod holders 3, 5 are provided for example, in FIG. 4a a plurality of axially spaced packs with two rod holders 3, 5 each are used.
Die Sieböffnungen des Siebkorbes werden von den Schlitzen benachbarter Profilstäbe 1 gebildet. In der Praxis haben solche Schlitze oft eine Weite zwischen 0,05 und 2 mm. The screen openings of the screen basket are formed by the slots in adjacent profile bars 1. In practice, such slots often have a width between 0.05 and 2 mm.
Für eine verstärkte Klemmung der Profilstäbe 1 in den Aussparungen 4 wird über radial von außen einwirkende Kräfte F ein dauerhafter Formschluss zwischen den Profilstäben 1 und den Aussparungen 4 erzeugt. For increased clamping of the profile bars 1 in the recesses 4, a permanent form fit between the profile bars 1 and the recesses 4 is generated by forces F acting radially from the outside.
Die radiale Krafteinwirkung wird gemäß Figuren 2 über mehrere, radial gleichmäßig über den Zylinderumfang verteilt angeordnete Stempel 8 realisiert, die radial von außen direkt auf die Stabhalter 3,5 einwirken und dabei insbesondere auf die Zylinderachse 2 des vormontierten Siebkorbes gerichtet sind. Dabei können die axial nebeneinander angeordneten Stempel 8 benachbarter Stabhalter 3 auch als ein gemeinsamer Stempel 8 ausgeführt werden. According to FIG. 2, the radial force effect is realized by several punches 8, which are arranged radially evenly distributed over the cylinder circumference and which act radially from the outside directly on the rod holders 3, 5 and are directed in particular towards the cylinder axis 2 of the preassembled screen basket. The punches 8 of adjacent rod holders 3, arranged axially next to one another, can also be designed as a common punch 8.
Hierbei wird die, in Pressrichtung weisende Pressfläche aller Stempel 8 jeweils von einem Kreisabschnitt gebildet, dessen Radius dem Außenradius der Siebvorrichtung nach dem Pressvorgang entspricht. Da der von den Stabhaltern 3 gebildete Außenradius der Siebvorrichtung vor dem Pressvorgang geringfügig größer als danach ist, besteht am Beginn des Pressvorgangs zwischen den Stabhaltern 3 und der Pressfläche im mittleren Teil der Stempels 8 ein kleines Spiel. Dieses Spiel kann beim Beginn des Pressens und den damit verbundenen, geringeren Presskräften in Kauf genommen werden und vermindert sich mit fortschreitender Pressung. Here, the pressing surface of all punches 8 pointing in the pressing direction is each formed by a segment of a circle, the radius of which corresponds to the outer radius of the sieve device after the pressing process. Since the outer radius of the sieve device formed by the rod holders 3 is slightly larger before the pressing process than afterwards, there is a small amount of play between the rod holders 3 and the pressing surface in the central part of the punch 8 at the beginning of the pressing process. This play can be accepted at the start of pressing and the associated lower pressing forces and decreases as the pressing progresses.
Die Umformung erfolgt sehr schonend und gleichmäßig, so dass es an den Stabhaltern 3,5 zu keiner Überbeanspruchung kommt. Auf eine zusätzliche Befestigung der Profilstäbe 1 kann in der Regel verzichtet werden. Während der radialen Krafteinwirkung werden die Stempel 8 in Führungsnuten axial und radial geführt. The deformation takes place very gently and evenly, so that there is no overstressing of the rod holders 3.5. An additional fastening of the profile bars 1 can generally be dispensed with. During the radial application of force, the punches 8 are guided axially and radially in guide grooves.
Da die Innenseite der Stabhalter 3,5 während der radialen Krafteinwirkung keinen Stütz oder Biegekräften ausgesetzt ist, führt die radiale Krafteinwirkung zu einer Verringerung des Durchmessers der kraftbeaufschlagten Stabhalter 3,5 sowie einer plastischen Verformung der Stabhalter 3,5 im Bereich der Aussparungen 4, in deren Folge der Raum zwischen Profilstab 1 und Stabhalter 3,5, wie in Figur 3b dargestellt, geschlossen wird. Since the inside of the rod holders 3.5 is not exposed to any supporting or bending forces during the radial force, the radial force leads to a reduction in the diameter of the force-loaded rod holders 3.5 and a plastic deformation of the rod holders 3.5 in the area of the recesses 4, in the result of which is the space between the profile bar 1 and bar holder 3.5, as shown in Figure 3b, is closed.
Wegen der Profilierung der Profilstäbe 1 sowie der komplementären Form wird so eine starke Klemmung der Stabfüße in der jeweiligen Aussparung 4 erreicht. Because of the profiling of the profile rods 1 and the complementary shape, a strong clamping of the rod feet in the respective recess 4 is achieved.
An den beiden stirnseitigen Enden der Siebvorrichtung befindet sich jeweils ein Endring 6 benachbart zu einem äußeren Stabhalter 5. An end ring 6 is located adjacent to an outer rod holder 5 at each of the two end faces of the sieve device.
Diese Endringe 6 sind bei Figur 4b jeweils mit dem axial äußeren Stabhalter 5 und bei Figur 4a jeweils mit dem axial äußeren Paket umfassend den äußeren 5 und einen benachbarten axial inneren 3 Stabhalter mittels Verschraubung 10 lösbar verbunden. These end rings 6 are detachably connected in FIG. 4b to the axially outer rod holder 5 and in FIG. 4a to the axially outer package comprising the outer 5 and an adjacent axially inner 3 rod holder by means of a screw connection 10.
Diese Verschraubung 10 erfolgt dabei über mehrere, gleichmäßig über den Umfang des Endrings 6 verteilte Schrauben und ist sehr belastbar, was beispielsweise das Anheben der Siebvorrichtung über einen Endring 6 erlaubt. This screw connection 10 takes place via several screws evenly distributed over the circumference of the end ring 6 and is very resilient, which, for example, allows the sieve device to be lifted over an end ring 6.
Ein Verschweißen sowie eine entsprechende Nachbearbeitung können entfallen. Außerdem wird so auch eine Wiederverwendung der Endringe 6 nach dem Verschleiß der Siebvorrichtung möglich. Welding and corresponding post-processing can be dispensed with. In addition, it is also possible in this way to reuse the end rings 6 after the sieve device has been worn out.
Um zu verhindern, dass sich die Profilstäbe 1 in der Siebvorrichtung axial verschieben, umfasst der jeweilige Endring 6 einen senkrecht zur Zylinderachse 2 angeordneten Blockierring 9. In order to prevent the profile bars 1 from shifting axially in the screening device, the respective end ring 6 comprises a blocking ring 9 arranged perpendicular to the cylinder axis 2.
Dieser Blockierring 9 ist bei Figur 4a als ringförmiger Draht mit kreisrundem Querschnitt und bei Figur 4b als ringförmige Scheibe ausgebildet. Die Fixierung der axialen Lage des Blockierrings 9 erfolgt in beiden Fällen über ein Einklemmen eines radial äußeren Abschnitts des Blockierrings 9 zwischen dem Endring 6 und dem benachbarten äußeren Stabhalter 5. This blocking ring 9 is designed as an annular wire with a circular cross-section in FIG. 4a and as an annular disk in FIG. 4b. The axial position of the blocking ring 9 is fixed in both cases by clamping a radially outer one Section of the blocking ring 9 between the end ring 6 and the adjacent outer rod holder 5.
Zur axialen Lagefixierung der Profilstäbe 1 sind diese hier am radialen Außenumfang im Bereich des jeweiligen Blockierrings 9 profiliert ausgebildet, wobei der diesem Profil 11 jeweils gegenüberliegende Kontakt-Bereich des Blockierrings 9 dazu komplementär ausgeformt ist. To fix the position of the profile bars 1 axially, they are profiled here on the radial outer circumference in the area of the respective blocking ring 9, the contact area of the blocking ring 9 opposite this profile 11 being shaped complementary thereto.
Das Profil 11 ist dabei so ausgebildet, dass im Zusammenwirken mit dem komplementären Kontaktbereich ein relatives Verschieben zwischen Profilstab 1 und Blockierring 9 verhindert wird. The profile 11 is designed in such a way that, in cooperation with the complementary contact area, a relative displacement between the profile rod 1 and the blocking ring 9 is prevented.
Im Ergebnis ragt der axial am Endring 6 fixierte Blockierring 9 bei den beiden Ausführungen radial in den Profilstab 1 hinein. As a result, the blocking ring 9 fixed axially on the end ring 6 protrudes radially into the profile bar 1 in the two versions.
Andere Möglichkeiten der axialen Lagefixierung oder Gestaltung des Blockierrings 9 oder der Profilierung ergeben sich, wenn der Endring 6 mehrteilig ausgebildet. Other possibilities for the axial fixation of position or the design of the blocking ring 9 or the profiling arise when the end ring 6 is constructed in several parts.
Aufteilungen des Endrings 6 sind in radialer, axialer oder in Umfangsrichtung möglich. The end ring 6 can be divided in the radial, axial or circumferential direction.
Die lösbare Befestigung der Endringe 6 am äußeren Stabhalter 5 oder dem äußeren Stabhalter-Paket kann unabhängig davon erfolgen, ob die Stabhalter 5 ihre Aussparungen 4 wie hier an der Innenseite oder aber an der Außenseite aufweisen.The detachable attachment of the end rings 6 to the outer rod holder 5 or the outer rod holder package can take place regardless of whether the rod holders 5 have their recesses 4, as here, on the inside or on the outside.
Dies gilt auch unabhängig von der Art der Befestigung der Profilstäbe 1 an den Stabhaltern 3,5. This also applies regardless of the type of fastening of the profile bars 1 to the bar holders 3.5.

Claims

Patentansprüche Claims
1. Zylindrische Siebvorrichtung mit einer Vielzahl von Profilstäben (1), bei der mehrere ringförmige, senkrecht zur Zylinderachse (2) verlaufende und voneinander beabstandete Stabhalter (3,5) oder voneinander beabstandete Pakete von mehreren Stabhaltern (3,5) an der Innen- oder Außenseite mit randoffenen Aussparungen (4) versehen sind, deren Form den Stabfüßen der Profilstäbe (1) im Wesentlichen komplementär entspricht und bei der die Profilstäbe (1) parallel zueinander und parallel zur Zylinderachse (2) in die Aussparungen (4) eingesetzt sind, wobei jeweils ein äußerer Stabhalter (5) im Bereich eines jeweiligen stirnseitigen Endringes (6) der Siebvorrichtung angeordnet ist, dadurch gekennzeichnet, dass zumindest der jeweilige, äußere Stabhalter (5) mit dem Endring (6) lösbar verbunden ist. 1. Cylindrical screening device with a large number of profile rods (1), in which several ring-shaped rod holders (3, 5) running perpendicular to the cylinder axis (2) and spaced apart from one another or packages of several rod holders (3, 5) spaced from one another are attached to the inner or the outside are provided with open-edged recesses (4), the shape of which corresponds essentially to the rod feet of the profile bars (1) and in which the profile bars (1) are inserted into the recesses (4) parallel to one another and parallel to the cylinder axis (2), wherein an outer rod holder (5) is arranged in the area of a respective end ring (6) of the screening device, characterized in that at least the respective outer rod holder (5) is detachably connected to the end ring (6).
2. Zylindrische Siebvorrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass der äußere Stabhalter (5) Teil eines Paketes von mehreren Stabhaltern (3,5) ist. 2. Cylindrical sieve device according to claim 1, characterized in that the outer rod holder (5) is part of a package of several rod holders (3, 5).
3. Zylindrische Siebvorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass mehrere oder alle Stabhalter (3,5) des Stabhalter-Paketes mit dem Endring (6) lösbar verbunden sind. 3. Cylindrical sieve device according to claim 2, characterized in that several or all of the rod holders (3, 5) of the rod holder package are releasably connected to the end ring (6).
4. Zylindrische Siebvorrichtung nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die lösbare Verbindung als Verschraubung (10) ausgeführt ist. 4. Cylindrical screening device according to one of the preceding claims, characterized in that the releasable connection is designed as a screw connection (10).
5. Zylindrische Siebvorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass ein oder mehrere Profilstäbe (1) am radialen Außen- oder Innenumfang im Bereich des jeweiligen Endrings (6) profiliert ausgebildet sind und der diesem Profil (11) jeweils gegenüberliegende Kontakt-Bereich des Endrings (6) dazu komplementär ausgeformt ist. 5. Cylindrical screening device according to one of the preceding claims, characterized in that one or more profile bars (1) are profiled on the radial outer or inner circumference in the area of the respective end ring (6) and the contact area opposite this profile (11) of the end ring (6) is shaped complementary to this.
6. Zylindrische Siebvorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der jeweilige Endring (6) einen senkrecht zur Zylinderachse (2) angeordneten Blockierring (9) umfasst, ein oder mehrere Profilstäbe (1) am radialen Außen- oder Innenumfang im Bereich des jeweiligen Blockierrings (9) profiliert ausgebildet sind und der diesem Profil (11) jeweils gegenüberliegende Kontakt-Bereich des Blockierrings (9) dazu komplementär ausgeformt ist. 6. Cylindrical screening device according to one of the preceding claims, characterized in that the respective end ring (6) comprises a blocking ring (9) arranged perpendicular to the cylinder axis (2), one or more profile bars (1) on the radial outer or inner circumference in the region of the the respective blocking ring (9) are profiled and the contact area of the blocking ring (9) opposite this profile (11) is shaped complementary thereto.
7. Zylindrische Siebvorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass der Blockierring (9) am Endring (6) oder zwischen dem Endring (6) und dem äußeren Stabhalter (5) axial fixiert ist. 7. Cylindrical sieve device according to claim 6, characterized in that the blocking ring (9) is axially fixed on the end ring (6) or between the end ring (6) and the outer rod holder (5).
8. Zylindrische Siebvorrichtung nach Anspruch 6 oder 7, dadurch gekennzeichnet, dass der Blockierring (9) als ringförmiger Draht oder als ringförmige Scheibe ausgebildet ist. 8. Cylindrical screening device according to claim 6 or 7, characterized in that the blocking ring (9) is designed as an annular wire or as an annular disc.
9. Zylindrische Siebvorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Endring (6) mehrteilig ausgebildet ist. 9. Cylindrical sieve device according to one of the preceding claims, characterized in that the end ring (6) is constructed in several parts.
EP20786508.0A 2019-10-25 2020-10-01 Screening cylinder Active EP4048450B1 (en)

Applications Claiming Priority (2)

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DE102019128878.9A DE102019128878B3 (en) 2019-10-25 2019-10-25 Screen cylinder
PCT/EP2020/077554 WO2021078490A1 (en) 2019-10-25 2020-10-01 Screening cylinder

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JP (1) JP2022553727A (en)
KR (1) KR20220084177A (en)
CN (1) CN114616057B (en)
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DE4435538C2 (en) * 1994-10-05 1996-10-02 Voith Gmbh J M Process for the production of a flat screen
US5791495A (en) * 1996-03-11 1998-08-11 Beloit Technologies, Inc. Paper pulp screen cylinder
JP3286592B2 (en) * 1997-12-25 2002-05-27 相川鉄工株式会社 Screening equipment for papermaking
US5968357A (en) * 1998-08-27 1999-10-19 Voith Sulzer Paper Technology North America, Inc. Screen basket having a removable and replaceable cylindrical mesh liner
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DE10065930B4 (en) 2000-12-22 2006-05-18 Voith Paper Patent Gmbh Method of making screens useful for wet screening of paper pulp suspensions
CN2455755Y (en) * 2000-12-26 2001-10-24 温州银翼造纸筛选设备有限公司 High strength screen drum structure with slanting gaps
WO2006119614A1 (en) * 2005-05-09 2006-11-16 Hetu Marc-Andre Screen basket with replaceable profiled bars
DE102006007600B4 (en) 2006-02-18 2016-12-15 Leopold Kostal Gmbh & Co. Kg Turntable for electric or electronic bone in a motor vehicle
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PL4048450T3 (en) 2024-06-10
EP4048450B1 (en) 2023-12-13
DE102019128878B3 (en) 2020-07-30
US11839901B2 (en) 2023-12-12
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US20220234076A1 (en) 2022-07-28
CN114616057B (en) 2024-04-09

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