EP0955101A2 - Screening apparatus - Google Patents
Screening apparatus Download PDFInfo
- Publication number
- EP0955101A2 EP0955101A2 EP99108452A EP99108452A EP0955101A2 EP 0955101 A2 EP0955101 A2 EP 0955101A2 EP 99108452 A EP99108452 A EP 99108452A EP 99108452 A EP99108452 A EP 99108452A EP 0955101 A2 EP0955101 A2 EP 0955101A2
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- EP
- European Patent Office
- Prior art keywords
- screen
- screening device
- auxiliary
- beater mechanism
- main
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- 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.)
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Classifications
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- 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
- B07B1/22—Revolving drums
- B07B1/24—Revolving drums with fixed or moving interior agitators
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- 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
- B07B1/20—Stationary drums with moving interior agitators
Definitions
- the invention relates to a sieve device with a main sieve and a movable preliminary sieve, which is connected to a main racket interacting with the main sieve.
- a sieve device of the type mentioned is known from US 4 202 759.
- a pre-screen is used to protect the main screen.
- the main racket mechanism is attached to this pre-screen, so that when the Pre-sieve not only produces a movement of the bulk material relative to the pre-sieve, but also promotes the bulk material that has passed through the pre-sieve relative to the main sieve. Coarse parts that remain in the pre-screen basket may have to be removed from the pre-screen basket by hand.
- sieving with this sieving device is problematic, for example when the bulk material tends to clump or interlock. In this case it can be observed that the prescreen clogs relatively quickly and the operation of the screening device has to be interrupted for cleaning.
- a stationary part is penetrated by a screw conveyor, while a rotating part is connected to it, on the outside of which the main racket mechanism is attached.
- the material to be screened is thus permanently conveyed over the fixed part of the pre-screen. Due to the limited length, the screening capacity of this screening device is also limited. In addition, the screenings are heavily used due to the high relative speed. Sensitive parts such as gummy bears would be destroyed.
- the invention has for its object to provide a screening device that works satisfactorily even with problematic screenings.
- auxiliary beater works with the moving pre-screen and a Drive for generating a relative movement between auxiliary beater and pre-screen is provided.
- This construction retains the advantages that one had with a main racket mechanism that can be moved together with the pre-screen, and additionally has the advantage that the pre-screen is now also provided with a racket system.
- this beater which performs a relative movement to the pre-screen, the product to be screened is gently and slowly conveyed over the pre-screen, so that screenings that tend to clump or become blocked can be conveyed through the pre-screen at a relatively high throughput rate. Fine parts of the product that have passed through the pre-screen are also transported through the main racket through the main screen. Goods to be screened will of course be removed. Basically, two movements overlap here. On the one hand, the pre-screen moves in relation to the main screen.
- the auxiliary racket moves with respect to the moving pre-screen or the pre-screen with respect to the auxiliary racket.
- the auxiliary racket mechanism can act on the pre-screen over the entire length. This makes it possible to support the main racket mechanism over the entire length on the pre-screen, which enables increased stability, and still avoid product batches over the entire length of the pre-screen. Large, sensitive products are also carefully removed from the pre-screen.
- the auxiliary beater mechanism is preferably designed as a discharge device.
- the auxiliary beater mechanism therefore conveys the product, ie the material to be sieved, not only simply over the surface of the pre-screen, but also into one certain direction, namely towards the coarse material outlet, so that the throughput can be increased further.
- both the main screen and the pre-screen are designed as cylinder screens and the pre-screen and the auxiliary beater mechanism rotate at different speeds.
- a relative movement of the material to be screened can be achieved simply by rotating either the cylinder or the corresponding beater mechanism.
- the main screen will be kept stationary, and the main racket will graze along the inner wall of the main screen, possibly at a small distance. So that there is now a relative movement between the auxiliary racket and the pre-screen, it is only necessary to let these two parts rotate at different speeds. Such different speeds can be set relatively easily.
- the auxiliary beater mechanism is preferably rotatably mounted in a drive shaft of the pre-screen. This solves the problem of supporting the auxiliary racket in a relatively simple manner.
- the drive shaft for the pre-screen must be guided to the pre-screen anyway so that torque transmission is possible.
- the drive shaft has a sufficient diameter so that there is sufficient space for storing the auxiliary racket.
- an auxiliary shaft is guided through the drive shaft as the drive for the auxiliary racket mechanism. You can then use both the pre-screen with the main racket and the auxiliary racket drive from the same side. This has the advantage that the other side, which is drive-free, is easily accessible, for example for maintenance purposes.
- the drive shaft and the auxiliary shaft preferably have drive wheels which are arranged next to one another and are connected to the same drive motor.
- the auxiliary shaft extends completely through the drive shaft so that it is accessible on the side facing away from the preliminary screen.
- a drive wheel for the auxiliary racket so close to a drive wheel for the pre-screen and the main racket that both drive wheels can be connected to the same drive motor without major problems. So you get by with a single drive motor, so that the additional effort that has to be done for the auxiliary racket remains limited.
- the connection between the drive wheels and the drive motor can be made in many ways. For example, V-belts, timing belts, chains or gears can be used. You can also stop the auxiliary racket if necessary, i.e. drive it at zero speed. When the pre-screen moves, there is still a relative movement between the pre-screen and the auxiliary beater.
- the drive wheels advantageously have different effective diameters.
- the different speeds of the pre-screen and auxiliary racket are then set via the difference in diameter. This has the advantage that the output shaft of the drive motor does not have to be modified practically. There you can use the same driven wheels.
- the auxiliary beater mechanism is advantageously designed as a screw conveyor. It not only moves the material to be conveyed in the circumferential direction over the inside of the pre-screen, but also in the axial direction. This ensures that the parts of the screened material that cannot pass through the pre-screen can be conveyed out of the coarse material outlet.
- the conveyor screw advantageously has a lower delivery rate than a feed screw from an inlet to the inlet of the pre-screen. This takes into account the fact that a certain proportion of the material to be screened should pass through the pre-screen. This can be achieved in a simple manner in that the conveyor screw has a lower delivery rate despite a higher speed, for example when the screen basket itself rotates at a high speed at which the conveyor screw also rotates, but the speed difference between the screen and auxiliary beater mechanism is kept much smaller.
- the pitch of the screw can also be less.
- the screw conveyor has a single helix while the feed screw has a double or multiple helix.
- the auxiliary beater mechanism is advantageously traversed lengthways by an air duct which, based on a screenable material space, opens into a washing chamber within bearings.
- air duct Through the air duct, air with a certain pressure can be conveyed continuously or in sections, which then builds up a sealing air barrier in front of the sealing rings with which the bearings are to be protected from product.
- Product approach is avoided. Any product approach that has already been formed will be restored removed so that the seals and bearings have a relatively long life.
- the air is transported into the axially inside through the auxiliary racket, so that complicated wiring in moving parts can be avoided.
- the prescreen is preferably divided in the longitudinal direction.
- the advantages of a divided pre-screen as known for example from DE 43 31 782 C1, are combined with the advantages of a moving pre-screen with a relative movement between the auxiliary beater mechanism and the pre-screen.
- a part of the pre-screen preferably surrounds the feed screw and this part is arranged in a stationary manner.
- This part of the pre-screen can therefore be non-rotatably mounted in the housing. It is penetrated by the feed screw. Accordingly, the feed screw can convey the screen well over this part of the pre-screen, which mainly means a longitudinal movement. In addition, a small rotary part of the movement is also included. This movement is then followed by the pre-screening in the second part, which is supported by the auxiliary beater mechanism moved relative to the pre-screen.
- a screening device 1 has a stationary main screen 2, which is designed as a cylindrical screen.
- the main screen 2 is tensioned with aids, not shown, both in the axial direction and in the radial direction. Screening material which passes through the main screen 2 falls into a fine material outlet 3, from where it can be removed.
- the material to be screened is fed to an inlet housing 4 shown in dashed lines.
- a feed screw 5, which has a double helix 6, is arranged in the inlet housing 4.
- the double helix 6 is arranged on a shaft 7, which is rotatably mounted in a bearing 8, which is also only shown in broken lines. It extends through the housing 4 and protrudes from the housing 4 with a stub shaft 9.
- a drive wheel 10 is rotatably arranged, which is connected via a V-belt 11 to an output wheel 12, which is arranged on a drive shaft 13 of a motor 14.
- the feed screw 5 rotates and conveys material to be sieved from the inlet housing 4 through a feed channel 15 up to a rotationally fixed connection with the feed screw 5, which essentially corresponds to the moving pre-screen 16 according to FIG. 1, ie in this part 16a the feed screw 18 rotates, which in turn has a different speed than the feed screw 5.
- This part 16a of the pre-screen is connected to the feed screw 5 via a connection 40 .
- the pre-screen has a second part 16b which is fixed in the housing 4. This part 16b is penetrated by the feed screw 5. The feed screw 5 thus produces a relative movement with respect to this stationary part 16b of the pre-screen.
- the material to be screened is first conveyed over the part 16b of the pre-screen, with the help of the feed screw 5. Then the screened material comes into the other part 16a of the pre-screen and is there with the help of the screw conveyor 8, which is a relative movement to the part 16a of the Pre-screen, driven by the pre-screen.
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- Combined Means For Separation Of Solids (AREA)
Abstract
Es wird Siebeinrichtung (1) angegeben mit einem Hauptsieb (2) und einen relativ dazu beweglichen Vorsieb (16), das mit einem mit dem Hauptsieb (2) zusammenwirkenden Hauptschlägerwerk (17) verbunden ist. Mit einer derartigen Siebeinrichtung soll auch problematisches Siebgut zufriedenstellend gesiebt werden können. Hierzu ist ein mit dem Vorsieb (16) zusammenwirkendes Hilfsschlägerwerk (18) relativ zum bewegten Vorsieb (16) angetrieben. <IMAGE>Screening device (1) is specified with a main screen (2) and a preliminary screen (16) movable relative to it, which is connected to a main racket mechanism (17) which interacts with the main screen (2). With such a screening device, problematic screenings should also be screened satisfactorily. For this purpose, an auxiliary beater mechanism (18) which interacts with the pre-screen (16) is driven relative to the moving pre-screen (16). <IMAGE>
Description
Die Erfindung betrifft eine Siebeinrichtung mit einem Hauptsieb und einen relativ dazu beweglichen Vorsieb, das mit einem mit dem Hauptsieb zusammenwirkenden Hauptschlägerwerk verbunden ist.The invention relates to a sieve device with a main sieve and a movable preliminary sieve, which is connected to a main racket interacting with the main sieve.
Bei der Verarbeitung von pulver- oder granulatförmigen Schüttgütern, beispielsweise in der Lebensmittelindustrie oder der pharmazeutischen Industrie, ist es oft notwendig, diese Schüttgüter von störenden Fremdkörpern zu befreien. Eine andere Aufgabenstellung ergibt sich dann, wenn im Verlauf eines Produktionsprozesses Produkte entstehen, die von störendem Beiwerk befreit werden sollen, beispielsweise von Formpulver oder von Formmasse getrennt werden sollen.When processing powdered or granular bulk goods, for example in the food industry or the pharmaceutical industry, it is often necessary to free these bulk goods from disruptive foreign bodies. Another task arises if, during the course of a production process, products are created which are to be freed from disruptive accessories, for example to be separated from molding powder or molding compound.
Eine Siebeinrichtung der eingangs genannten Art ist aus US 4 202 759 bekannt. Zur Schonung des Hauptsiebs wird ein Vorsieb verwendet. An diesem Vorsieb ist das Hauptschlägerwerk befestigt, so daß bei einer Bewegung des Vorsiebs nicht nur eine Bewegung des Schüttguts relativ zum Vorsieb erzeugt wird, sondern auch eine Förderung des durch das Vorsieb durchgetretenen Schüttguts relativ zum Hauptsieb bewirkt wird. Grobe Teile, die im Vorsiebkorb verbleiben, müssen unter Umständen von Hand aus dem Vorsiebkorb entfernt werden.A sieve device of the type mentioned is known from US 4 202 759. A pre-screen is used to protect the main screen. The main racket mechanism is attached to this pre-screen, so that when the Pre-sieve not only produces a movement of the bulk material relative to the pre-sieve, but also promotes the bulk material that has passed through the pre-sieve relative to the main sieve. Coarse parts that remain in the pre-screen basket may have to be removed from the pre-screen basket by hand.
In einigen Anwendungsfällen ist das Sieben mit dieser Siebeinrichtung allerdings problematisch, beispielsweise dann, wenn das Schüttgut zum Klumpen neigt oder sich ineinander verhakt. In diesem Fall läßt sich beobachten, daß das Vorsieb relativ schnell verstopft und der Betrieb der Siebeinrichtung zum Reinigen unterbrochen werden muß.In some applications, however, sieving with this sieving device is problematic, for example when the bulk material tends to clump or interlock. In this case it can be observed that the prescreen clogs relatively quickly and the operation of the screening device has to be interrupted for cleaning.
Man hat daher in DE 43 31 782 C1 das Vorsieb geteilt. Ein feststehender Teil wird von einer Förderschnecke durchragt, während sich daran ein rotierender Teil anschließt, an dessen Außenseite das Hauptschlägerwerk befestigt ist. Damit wird das Siebgut zwar permanent über den feststehenden Teil des Vorsiebs gefördert. Aufgrund der begrenzten Länge ist aber auch die Siebkapazität dieser Siebeinrichtung begrenzt. Außerdem wird durch die hohe Relativgeschwindigkeit das Siebgut stark beansprucht. Empfindliche Teile, wie beispielsweise Gummibärchen, würden zerstört.One has therefore divided the prescreen in DE 43 31 782 C1. A stationary part is penetrated by a screw conveyor, while a rotating part is connected to it, on the outside of which the main racket mechanism is attached. The material to be screened is thus permanently conveyed over the fixed part of the pre-screen. Due to the limited length, the screening capacity of this screening device is also limited. In addition, the screenings are heavily used due to the high relative speed. Sensitive parts such as gummy bears would be destroyed.
Der Erfindung liegt die Aufgabe zugrunde, eine Siebeinrichtung anzugeben, die auch bei problematischem Siebgut zufriedenstellend arbeitet.The invention has for its object to provide a screening device that works satisfactorily even with problematic screenings.
Diese Aufgabe wird bei einer Siebeinrichtung der eingangs genannten Art dadurch gelöst, daß ein Hilfsschlägerwerk mit dem bewegten Vorsieb zusammenwirkt und ein Antrieb zur Erzeugung einer Relativbewegung zwischen Hilfsschlägerwerk und Vorsieb vorgesehen ist .This object is achieved in a screening device of the type mentioned in that an auxiliary beater works with the moving pre-screen and a Drive for generating a relative movement between auxiliary beater and pre-screen is provided.
Bei dieser Konstruktion behält man die Vorteile, die man durch ein mit dem Vorsieb gemeinsam bewegbaren Hauptschlägerwerk hatte, und erhält zusätzlich den Vorteil, daß nun auch das Vorsieb mit einem Schlägerwerk versehen ist. Mit diesem Schlägerwerk, das eine Relativbewegung zum Vorsieb durchführt, wird das zu siebende Produkt schonend langsam und dauernd über das Vorsieb gefördert, so daß auch zum Klumpen oder zu Verstopfungen neigendes Siebgut mit einer relativ hohen Durchsatzrate durch das Vorsieb gefördert werden kann. Feine Teile des Produkts, die durch das Vorsieb getreten sind, werden durch das Hauptschlägerwerk auch durch das Hauptsieb transportiert. Auszusiebendes Gut wird selbstverständlich abgefördert. Im Grunde genommen überlagern sich hier dann zwei Bewegungen. Zum einen bewegt sich das Vorsieb gegenüber dem Hauptsieb. Zum anderen bewegt sich das Hilfsschlägerwerk gegenüber dem bewegten Vorsieb beziehungsweise das Vorsieb gegenüber dem Hilfsschlägerwerk. Das Hilfsschlägerwerk kann über die gesamte Länge auf das Vorsieb wirken. Damit ist es möglich, das Hauptschlägerwerk auf der gesamten Länge am Vorsieb abzustützen, was eine erhöhte Stabilität ermöglicht, und trotzdem Produktansätze über die gesamte Länge des Vorsiebs zu vermeiden. Auch große, empfindliche Produkte werden schonend aus dem Vorsieb ausgetragen.This construction retains the advantages that one had with a main racket mechanism that can be moved together with the pre-screen, and additionally has the advantage that the pre-screen is now also provided with a racket system. With this beater, which performs a relative movement to the pre-screen, the product to be screened is gently and slowly conveyed over the pre-screen, so that screenings that tend to clump or become blocked can be conveyed through the pre-screen at a relatively high throughput rate. Fine parts of the product that have passed through the pre-screen are also transported through the main racket through the main screen. Goods to be screened will of course be removed. Basically, two movements overlap here. On the one hand, the pre-screen moves in relation to the main screen. On the other hand, the auxiliary racket moves with respect to the moving pre-screen or the pre-screen with respect to the auxiliary racket. The auxiliary racket mechanism can act on the pre-screen over the entire length. This makes it possible to support the main racket mechanism over the entire length on the pre-screen, which enables increased stability, and still avoid product batches over the entire length of the pre-screen. Large, sensitive products are also carefully removed from the pre-screen.
Vorzugsweise ist das Hilfsschlägerwerk als Austrageinrichtung ausgebildet Das Hilfsschlägerwerk fördert also das Produkt, d.h. das zu siebende Gut, nicht nur einfach über die Fläche des Vorsiebs, sondern auch in eine bestimmte Richtung, nämlich zum Grobgutauslaß hin, so daß der Durchsatz weiter erhöht werden kann.The auxiliary beater mechanism is preferably designed as a discharge device. The auxiliary beater mechanism therefore conveys the product, ie the material to be sieved, not only simply over the surface of the pre-screen, but also into one certain direction, namely towards the coarse material outlet, so that the throughput can be increased further.
In einer bevorzugten Ausgestaltung ist vorgesehen, daß sowohl das Hauptsieb als auch das Vorsieb als Zylindersiebe ausgebildet sind und das Vorsieb und das Hilfsschlägerwerk mit unterschiedlichen Geschwindigkeiten rotieren. Bei einem Zylindersieb läßt sich eine Relativbewegung des Siebguts zum Sieb einfach dadurch realisieren, daß entweder der Zylinder oder das entsprechende Schlägerwerk gedreht wird. In der Regel wird das Hauptsieb stationär gehalten werden, und das Hauptschlägerwerk streift, gegebenenfalls mit einem kleinen Abstand, an der Innenwand des Hauptsiebes entlang. Damit sich nun eine Relativbewegung zwischen dem Hilfsschlägerwerk und dem Vorsieb ergibt, ist es lediglich erforderlich, diese beiden Teile mit unterschiedlichen Geschwindigkeiten rotieren zu lassen. Derartige unterschiedliche Geschwindigkeiten lassen sich relativ leicht einstellen.In a preferred embodiment it is provided that both the main screen and the pre-screen are designed as cylinder screens and the pre-screen and the auxiliary beater mechanism rotate at different speeds. In the case of a cylinder screen, a relative movement of the material to be screened can be achieved simply by rotating either the cylinder or the corresponding beater mechanism. As a rule, the main screen will be kept stationary, and the main racket will graze along the inner wall of the main screen, possibly at a small distance. So that there is now a relative movement between the auxiliary racket and the pre-screen, it is only necessary to let these two parts rotate at different speeds. Such different speeds can be set relatively easily.
Vorzugsweise ist das Hilfsschlägerwerk in einer Antriebswelle des Vorsiebs drehbar gelagert. Damit löst man auf relativ einfache Weise das Problem der Abstützung des Hilfsschlägerwerks. Die Antriebswelle für das Vorsieb muß ohnehin bis zum Vorsieb hin geführt werden, damit eine Drehmomentübertragung möglich ist. Die Antriebswelle hat aber einen ausreichenden Durchmesser, so daß genügend Platz für eine Lagerung des Hilfsschlägerwerks zur Verfügung steht.The auxiliary beater mechanism is preferably rotatably mounted in a drive shaft of the pre-screen. This solves the problem of supporting the auxiliary racket in a relatively simple manner. The drive shaft for the pre-screen must be guided to the pre-screen anyway so that torque transmission is possible. However, the drive shaft has a sufficient diameter so that there is sufficient space for storing the auxiliary racket.
Hierbei ist besonders bevorzugt, daß eine Hilfswelle als Antrieb des Hilfsschlägerwerks durch die Antriebswelle geführt ist. Man kann dann sowohl das Vorsieb mit dem Hauptschlägerwerk als auch das Hilfsschlägerwerk von der gleichen Seite aus antreiben. Dies hat den Vorteil, daß die andere Seite, die antriebsfrei ist, beispielsweise für Wartungszwecke leicht zugänglich ist.It is particularly preferred here that an auxiliary shaft is guided through the drive shaft as the drive for the auxiliary racket mechanism. You can then use both the pre-screen with the main racket and the auxiliary racket drive from the same side. This has the advantage that the other side, which is drive-free, is easily accessible, for example for maintenance purposes.
Vorzugsweise weisen die Antriebswelle und die Hilfswelle nebeneinander angeordnete Antriebsräder auf, die mit dem gleichen Antriebsmotor verbunden sind. In diesem Fall durchragt die Hilfswelle die Antriebswelle vollständig, so daß sie auf der dem Vorsieb abgewandten Seite zugänglich ist. Dort kann man nun ein Antriebsrad für das Hilfsschlägerwerk so dicht neben einem Antriebsrad für das Vorsieb und das Hauptschlägerwerk anordnen, daß beide Antriebsräder ohne größere Problematik mit dem gleichen Antriebsmotor verbunden werden können. Man kommt also mit einem einzigen Antriebsmotor aus, so daß der zusätzliche Aufwand, den man für das Hilfsschlägerwerk betreiben muß, in Grenzen bleibt. Die Verbindung zwischen den Antriebsrädern und dem Antriebsmotor kann auf vielerlei Weise erfolgen. Beispielsweise kann man Keilriemen, Zahnriemen, Ketten oder Zahnräder verwenden. Man kann das Hilfsschlägerwerk gegebenenfalls auch stillsetzen, also mit Geschwindigkeit Null antreiben. Bei der Bewegung des Vorsiebs ergibt sich dennoch eine Relativbewegung zwischen Vorsieb und Hilfsschlägerwerk.The drive shaft and the auxiliary shaft preferably have drive wheels which are arranged next to one another and are connected to the same drive motor. In this case, the auxiliary shaft extends completely through the drive shaft so that it is accessible on the side facing away from the preliminary screen. There you can now arrange a drive wheel for the auxiliary racket so close to a drive wheel for the pre-screen and the main racket that both drive wheels can be connected to the same drive motor without major problems. So you get by with a single drive motor, so that the additional effort that has to be done for the auxiliary racket remains limited. The connection between the drive wheels and the drive motor can be made in many ways. For example, V-belts, timing belts, chains or gears can be used. You can also stop the auxiliary racket if necessary, i.e. drive it at zero speed. When the pre-screen moves, there is still a relative movement between the pre-screen and the auxiliary beater.
Vorteilhafterweise weisen die Antriebsräder unterschiedliche Wirkdurchmesser auf. Die unterschiedlichen Drehzahlen von Vorsieb und Hilfsschlägerwerk werden dann über den Durchmesserunterschied eingestellt. Dies hat den Vorteil, daß die Ausgangswelle des Antriebsmotors praktisch nicht modifiziert werden muß. Dort kann man gleiche Abtriebsräder verwenden.The drive wheels advantageously have different effective diameters. The different speeds of the pre-screen and auxiliary racket are then set via the difference in diameter. This has the advantage that the output shaft of the drive motor does not have to be modified practically. There you can use the same driven wheels.
Mit Vorteil ist das Hilfsschlägerwerk als Förderschnecke ausgebildet. Es bewegt das Fördergut also nicht nur in Umfangsrichtung über die Innenseite des Vorsiebs, sondern auch in Axialrichtung. Damit wird sichergestellt, daß die Teile des Siebgutes, die nicht durch das Vorsieb treten können, aus dem Grobgutauslaß herausgefördert werden können.The auxiliary beater mechanism is advantageously designed as a screw conveyor. It not only moves the material to be conveyed in the circumferential direction over the inside of the pre-screen, but also in the axial direction. This ensures that the parts of the screened material that cannot pass through the pre-screen can be conveyed out of the coarse material outlet.
Mit Vorteil weist die Förderschnecke eine geringere Förderleistung als eine Zuführschnecke von einem Einlauf zum Eingang des Vorsiebs auf. Man trägt damit der Tatsache Rechnung, daß ein bestimmter Anteil des Siebguts durch das Vorsieb hindurchtreten soll. Dies läßt sich auf einfache Weise dadurch realisieren, daß die Förderschnecke trotz einer höheren Drehzahl eine geringere Förderleistung aufweist, zum Beispiel dann, wenn der Vorsiebkorb selbst mit einer hohen Drehzahl rotiert, mit der sich auch die Förderschnecke dreht, die Drehzahldifferenz zwischen Vorsieb und Hilfsschlägerwerk aber wesentlich kleiner gehalten wird. Auch kann die Steigung der Schnecke geringer sein. In einer alternativen Ausgestaltung kann man auch vorsehen, daß die Förderschnecke eine Einfachwendel aufweist, während die Zuführschnecke eine Doppel- oder Mehrfachwendel aufweist.The conveyor screw advantageously has a lower delivery rate than a feed screw from an inlet to the inlet of the pre-screen. This takes into account the fact that a certain proportion of the material to be screened should pass through the pre-screen. This can be achieved in a simple manner in that the conveyor screw has a lower delivery rate despite a higher speed, for example when the screen basket itself rotates at a high speed at which the conveyor screw also rotates, but the speed difference between the screen and auxiliary beater mechanism is kept much smaller. The pitch of the screw can also be less. In an alternative embodiment, it can also be provided that the screw conveyor has a single helix while the feed screw has a double or multiple helix.
Vorteilhafterweise ist das Hilfsschlägerwerk von einem Luftkanal der Länge nach durchsetzt, der, bezogen auf einen Siebgutraum, innerhalb von Lagern in einen Spülraum mündet. Durch den Luftkanal kann laufend oder abschnittsweise Luft mit einem gewissen Druck gefördert werden, die dann vor den Dichtringen, mit denen die Lager vor Produkt geschützt werden sollen, eine Sperrluft-Barriere aufbaut. Produktansatz wird vermieden. Eventuell bereits gebildeter Produktansatz wird wieder entfernt, so daß die Abdichtungen und die Lager eine relativ große Lebensdauer haben. Der Lufttransport in das axial Innere erfolgt durch das Hilfsschlägerwerk hindurch, so daß eine komplizierte Leitungsführung in bewegten Teilen vermieden werden kann.The auxiliary beater mechanism is advantageously traversed lengthways by an air duct which, based on a screenable material space, opens into a washing chamber within bearings. Through the air duct, air with a certain pressure can be conveyed continuously or in sections, which then builds up a sealing air barrier in front of the sealing rings with which the bearings are to be protected from product. Product approach is avoided. Any product approach that has already been formed will be restored removed so that the seals and bearings have a relatively long life. The air is transported into the axially inside through the auxiliary racket, so that complicated wiring in moving parts can be avoided.
Vorzugsweise ist das Vorsieb in Längsrichtung geteilt. Man kombiniert hierbei die Vorteile eines geteilten Vorsiebes, wie es beispielsweise aus DE 43 31 782 C1 bekannt ist, mit den Vorteilen eines bewegten Vorsiebes mit einer Relativbewegung zwischen Hilfsschlägerwerk und Vorsieb.The prescreen is preferably divided in the longitudinal direction. The advantages of a divided pre-screen, as known for example from DE 43 31 782 C1, are combined with the advantages of a moving pre-screen with a relative movement between the auxiliary beater mechanism and the pre-screen.
Vorzugsweise umgibt ein Teil des Vorsiebs die Zuführschnecke und dieser Teil ist stationär angeordnet. Dieser Teil des Vorsiebes kann also undrehbar im Gehäuse gelagert sein. Er wird von der Zuführschnecke durchragt. Dementsprechend kann die Zuführschnecke das Sieb gut über diesen Teil des Vorsiebes fördern, was hauptsächlich eine Längsbewegung bedeutet. Darüber hinaus ist aber auch ein kleiner rotatorischer Anteil der Bewegung enthalten. An diese Bewegung schließt sich dann das Vorsieben im zweiten Teil an, das durch das relativ zu dem Vorsieb bewegte Hilfsschlägerwerk unterstützt wird.A part of the pre-screen preferably surrounds the feed screw and this part is arranged in a stationary manner. This part of the pre-screen can therefore be non-rotatably mounted in the housing. It is penetrated by the feed screw. Accordingly, the feed screw can convey the screen well over this part of the pre-screen, which mainly means a longitudinal movement. In addition, a small rotary part of the movement is also included. This movement is then followed by the pre-screening in the second part, which is supported by the auxiliary beater mechanism moved relative to the pre-screen.
Die Erfindung wird im folgenden anhand eines bevorzugten Ausführungsbeispiels in Verbindung mit der Zeichnung näher beschrieben. Darin zeigen:
- Fig. 1
- eine schematische Seitenansicht einer Siebeinrichtung,
- Fig. 2
- einen Schnitt II-II nach Fig. 1,
- Fig. 3
- eine Stirnansicht entsprechend dem Pfeil III nach Fig. 1,
- Fig. 4
- eine vergrößerte Ansicht des linken Endes des Vorsiebs,
- Fig. 5
- eine vergrößerte Ansicht des rechten Endes des Vorsiebs und
- Fig. 6
- eine schematische Änderung einer abgewandelten Ausführungsform.
- Fig. 1
- a schematic side view of a screening device,
- Fig. 2
- 2 shows a section II-II according to FIG. 1,
- Fig. 3
- 2 shows an end view corresponding to the arrow III according to FIG. 1,
- Fig. 4
- an enlarged view of the left end of the pre-screen,
- Fig. 5
- an enlarged view of the right end of the pre-screen and
- Fig. 6
- a schematic change of a modified embodiment.
Eine Siebeinrichtung 1 weist ein stationäres Hauptsieb 2 auf, das als Zylindersieb ausgebildet ist. Das Hauptsieb 2 ist mit nicht näher dargestellten Hilfsmitteln sowohl in axialer Richtung als auch in radialer Richtung gespannt. Siebgut, das durch das Hauptsieb 2 hindurchtritt, fällt in einen Feingutauslaß 3, von wo aus es abgefördert werden kann.A
Das zu siebende Gut wird einem gestrichelt dargestellten Einlaufgehäuse 4 zugeführt. Im Einlaufgehäuse 4 ist eine Zuführschnecke 5 angeordnet, die eine Doppelwendel 6 aufweist. Die Doppelwendel 6 ist auf einer Welle 7 angeordnet, die drehbar in einem ebenfalls nur gestrichelt dargestellten Lager 8 gelagert ist. Sie durchragt das Gehäuse 4 und ragt mit einem Wellenstummel 9 aus dem Gehäuse 4 heraus. Auf dem Wellenstummel 9 ist ein Antriebsrad 10 drehfest angeordnet, das über einen Keilriemen 11 mit einem Abtriebsrad 12 verbunden ist, das auf einer Antriebswelle 13 eines Motors 14 angeordnet ist. Wenn der Motor 14 in Betrieb gesetzt wird, dann dreht sich die Zuführschnecke 5 und fördert Siebgut aus dem Einlaufgehäuse 4 durch einen Zuführkanal 15 bis zu einem drehfest mit der Zuführschnecke 5 verbunauf, der dem bewegten Vorsieb 16 nach Fig. 1 im wesentlichen entspricht, d.h. in diesem Teil 16a dreht sich die Förderschnecke 18, die wiederum eine andere Drehzahl aufweist als die Zuführschnecke 5. Dieser Teil 16a des Vorsiebs ist über eine Verbindung 40 mit der Zuführschnecke 5 verbunden.The material to be screened is fed to an
Das Vorsieb weist einen zweiten Teil 16b auf, der im Gehäuse 4 festgelegt ist. Dieser Teil 16b wird von der Zuführschnecke 5 durchragt. Die Zuführschnecke 5 erzeugt also eine Relativbewegung gegenüber diesem stationären Teil 16b des Vorsiebs.The pre-screen has a
Damit wird das Siebgut zunächst über den Teil 16b des Vorsiebs gefördert, und zwar mit Hilfe der Zuführschnecke 5. Daran anschließend kommt das Siebgut in den anderen Teil 16a des Vorsiebs und wird dort mit Hilfe der Förderschnecke 8, die eine Relativbewegung zu dem Teil 16a des Vorsiebs ausführt, durch das Vorsieb getrieben.The material to be screened is first conveyed over the
Claims (12)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19819866A DE19819866C1 (en) | 1998-05-04 | 1998-05-04 | Sieve arrangement for working with granular or powdered material |
| DE19819866 | 1998-05-04 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0955101A2 true EP0955101A2 (en) | 1999-11-10 |
| EP0955101A3 EP0955101A3 (en) | 2000-08-02 |
| EP0955101B1 EP0955101B1 (en) | 2003-11-26 |
Family
ID=7866626
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP99108452A Expired - Lifetime EP0955101B1 (en) | 1998-05-04 | 1999-04-30 | Screening apparatus |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0955101B1 (en) |
| DE (2) | DE19819866C1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102688795A (en) * | 2012-06-05 | 2012-09-26 | 张永胜 | High-efficiency wet straightening granulator |
| CN102764729A (en) * | 2012-07-16 | 2012-11-07 | 江阴市龙昌机械制造有限公司 | Quick release type rotary screening machine |
| CN103447240A (en) * | 2012-06-01 | 2013-12-18 | 株式会社佐竹 | Foreign substance separator |
| WO2021078158A1 (en) * | 2019-10-24 | 2021-04-29 | 安徽省环境科学研究院 | Efficient water-saving starch slurry and residue separation sieve and separating method |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2503233A (en) * | 2012-06-19 | 2013-12-25 | Kek Gardner Ltd | Centrifugal sifting apparatus |
| CN103008243B (en) * | 2012-11-16 | 2016-03-30 | 云南钛业股份有限公司 | Ball material screening plant |
| DK178512B1 (en) * | 2014-11-25 | 2016-04-25 | Jetek Rådgivende Maskiningeniør Aps | Apparatus and use thereof for separating fibre material |
| CN104438042A (en) * | 2014-11-29 | 2015-03-25 | 肖金坚 | Material screening device |
| CN105618365A (en) * | 2016-03-24 | 2016-06-01 | 宁波开诚生态技术有限公司 | Impurity removing separating machine |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE37093C (en) * | A. STEIGER in Manchester, England | Distribution and feeding device in sifting machines with two jackets arranged one inside the other | ||
| DE30775C (en) * | R. ZIEGER in Berlin | Outlet cylinder in separating machines with inner pre-cylinder (depending on patent no. 6402.) | ||
| US4202759A (en) * | 1978-11-24 | 1980-05-13 | Prater Industries, Inc. | Centrifugal screening apparatus |
| DE4331782C1 (en) * | 1993-09-18 | 1994-08-18 | Reimelt Dietrich Kg | Sieve arrangement |
-
1998
- 1998-05-04 DE DE19819866A patent/DE19819866C1/en not_active Expired - Fee Related
-
1999
- 1999-04-30 DE DE59907833T patent/DE59907833D1/en not_active Expired - Fee Related
- 1999-04-30 EP EP99108452A patent/EP0955101B1/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE37093C (en) * | A. STEIGER in Manchester, England | Distribution and feeding device in sifting machines with two jackets arranged one inside the other | ||
| DE30775C (en) * | R. ZIEGER in Berlin | Outlet cylinder in separating machines with inner pre-cylinder (depending on patent no. 6402.) | ||
| US4202759A (en) * | 1978-11-24 | 1980-05-13 | Prater Industries, Inc. | Centrifugal screening apparatus |
| DE4331782C1 (en) * | 1993-09-18 | 1994-08-18 | Reimelt Dietrich Kg | Sieve arrangement |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103447240A (en) * | 2012-06-01 | 2013-12-18 | 株式会社佐竹 | Foreign substance separator |
| CN102688795A (en) * | 2012-06-05 | 2012-09-26 | 张永胜 | High-efficiency wet straightening granulator |
| CN102764729A (en) * | 2012-07-16 | 2012-11-07 | 江阴市龙昌机械制造有限公司 | Quick release type rotary screening machine |
| WO2021078158A1 (en) * | 2019-10-24 | 2021-04-29 | 安徽省环境科学研究院 | Efficient water-saving starch slurry and residue separation sieve and separating method |
| US11311910B2 (en) | 2019-10-24 | 2022-04-26 | Anhui Academy of Environmental Science Research | High-efficiency water-saving separation screen for starch slurry and residue and separation method |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0955101B1 (en) | 2003-11-26 |
| EP0955101A3 (en) | 2000-08-02 |
| DE59907833D1 (en) | 2004-01-08 |
| DE19819866C1 (en) | 1999-04-15 |
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