EP3930926B1 - Screening device, in particular for use in a system for producing material panels - Google Patents
Screening device, in particular for use in a system for producing material panels Download PDFInfo
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- EP3930926B1 EP3930926B1 EP20712837.2A EP20712837A EP3930926B1 EP 3930926 B1 EP3930926 B1 EP 3930926B1 EP 20712837 A EP20712837 A EP 20712837A EP 3930926 B1 EP3930926 B1 EP 3930926B1
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- screening
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- inclination
- screening device
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- 238000012216 screening Methods 0.000 title claims description 76
- 239000000463 material Substances 0.000 title claims description 24
- 239000000725 suspension Substances 0.000 claims description 26
- 229910000831 Steel Inorganic materials 0.000 claims description 12
- 239000010959 steel Substances 0.000 claims description 12
- 239000002023 wood Substances 0.000 claims description 8
- 230000004888 barrier function Effects 0.000 claims description 5
- 230000003287 optical effect Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 2
- 238000007873 sieving Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Images
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
- B07B13/00—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices
- B07B13/14—Details or accessories
- B07B13/18—Control
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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
- B07B1/42—Drive mechanisms, regulating or controlling devices, or balancing devices, specially adapted for screens
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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
- B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
Definitions
- the present invention relates to a screening device, preferably of the circularly moving type, particularly preferably for use in a plant for the production of material panels, according to the preamble of patent claim 1.
- a screening device is, for example, from CA 1 246 012 A out.
- circular moving type screening devices are generally used to screen wood-based raw material into fractions of different sizes after chipping or defibration and drying.
- the particles sieved in this way and separated into size fractions can then be used in the manufacturing process of wooden material panels, for example by scattering them in a manner known per se to form a wood material mat and pressing the mat into a panel strand in a continuous press.
- the panel strand can then be separated into individual wood-based panels.
- Such circular or reciprocating screening devices are typically large steel structures in which a welded steel structure forms a support frame of the device, on which the actual screening unit is suspended via suspension elements, which are usually designed as articulated rods.
- the screening unit can thus move on a substantially circular path in the horizontal plane. It is preferably not a sieve that vibrates back and forth, but rather a sieve of circular motion in which a constant centripetal acceleration, rotating about a substantially vertical axis, brings the material to be sieved onto and through the sieve planes.
- a typical diameter of an orbit is 40-80 mm and the orbital speed is typically 150-200 rpm.
- Sieving is usually carried out using 2 to 4 sieving stages, which are formed from sieve grids that are slightly inclined with respect to the horizontal plane.
- the tilt angle is generally 5-10°.
- the material to be screened flows in the direction of the slope.
- the screen grids are accessible via side doors or hatches so they can be removed and replaced.
- the screening devices are typically large steel structures where the width of the support frame is more than 3 m and the length of the support frame is generally between 5 and 10 m. In addition, they are usually rigid constructions with a fixed angle of inclination. A change in the angle of inclination is therefore not possible or only possible with difficulty in such screening devices.
- the angle of inclination has a large influence on the volume flow of the material that is passed through the sieve unit and sieved by it.
- even relatively small differences in the angle of inclination show clear differences in the maximum residence time of particles on the sieve.
- the document WO 2015/200382 A1 describes a circularly moving screening device for use in the pharmaceutical, medical, oilfield, food and other industries in which a drive unit is movably suspended in a support frame.
- a sieve unit is arranged on the drive unit and is supported by angle pieces and brackets.
- the angle pieces and brackets are designed so that they can be connected to one another at different points in order to allow the inclination of the sieve unit to be adjusted.
- the adjustment of the inclination of the sieve unit can be carried out in this way without any structural changes and in an easier manner.
- due to the limited number of different positions specified by the design of the angle pieces and holders only a limited number of fixed, different inclination angles can be set. For adjustment it is also necessary to loosen the connection between angle pieces and holders, which can only be done when the screening device is at a standstill and requires additional work equipment, such as a crane or the like, to hold the screening unit.
- the screening device further comprises at least one electric motor and/or hydraulically operating adjustment device, which is set up to adjust the suspension of the screening unit on the support frame by means of the suspension elements in order to adjust an angle of inclination of the screening unit; and a control unit for controlling the at least one adjustment device.
- the at least one adjustment device can be designed as an electric motor-operated ball screw or as a hydraulic linear axis. Included It can preferably further be provided that the at least one adjustment device further has a rotary encoder system and / or a linear scale system, wherein further position control of the at least one adjustment device is carried out based on the measured values of the rotary encoder system and / or the linear scale system, and / or where on the basis of Measured values of the rotary encoder system and / or the linear scale system, the control device determines the actual inclination angle.
- At least one sensor can be provided for determining the volume flow through the sieve device, and the control device can further be set up to carry out an automatic inclination angle adjustment based on the determined volume flow.
- the suspension elements are preferably designed as steel cables. It can also be provided that two suspension elements designed as steel cables are guided via deflection rollers to a common adjustment device and actuated by it.
- the at least one sieve module can have several sieve grids which are arranged one above the other and have different mesh sizes in order to sieve the raw wood material to be sieved into fractions of different sizes.
- at least one light barrier can be provided, which is arranged over a sieve grid running transversely thereto, in order to determine over which length of the sieve module the sieve grid is covered with material to be sieved, the control unit preferably being set up to provide an automatic tilt angle adjustment based on the certain result. In this way, the operation of the screening device can be further optimized.
- the sieve unit can have two sieve modules and a frame module, with the frame module being arranged between the sieve modules.
- the at least one drive device can be arranged in the space between the sieve modules. In this way, a very compact design can be achieved.
- Fig. 1 shows a screening device according to an embodiment of the invention.
- the sieve device includes a support frame 1 and a suspended thereon, movable sieve unit 2.
- the suspension is formed by a plurality of suspension elements 3.
- suspension elements 3 are shown, which in this example are formed by articulated rods.
- the sieve unit 2 comprises two sieve modules 4 and a frame module 5 arranged between them.
- the frame module 5 preferably simultaneously functions as a support and fastener for the sieve modules 4.
- a sieve module 4 comprises one or more sieve chambers, which are arranged essentially one above the other and are structurally separated from one another, for example with a fixed intermediate level, in particular a sieve grid 7.
- a sieve grid 7 In each of these chambers, which are also referred to as a deck, the material to be sieved is at least two fractions were sieved.
- the drawings show an embodiment in which the sieve has two decks, i.e. there are two sieve chambers arranged one above the other in each sieve module 4.
- the material to be sieved is fed into the feed hoppers according to the arrows 6 and the sieved fractions are removed from the other end of the sieve in a manner known per se, with each fraction being delivered onto its own conveyor belt.
- the sieve modules 4 include sieve grids 7 ( Fig. 3 ).
- the sieve modules 4 and their sieve grids 7 are inclined to the horizontal plane at an angle of inclination, which is preferably in the range between 4° to 12°, with the material to be sieved flowing in the direction of the inclination when the sieve unit 2 is set in a horizontal circular movement becomes.
- the circular movement can be carried out with at least one, in the embodiment Fig. 2 with two drive devices 8, which are eccentric in their mass are and are located at least largely within the frame module 5, the drive devices having rotating shafts 9 which are essentially vertical and which, during operation, set the screening unit 2 in circular motion on a circular trajectory in the horizontal plane.
- the eccentric masses or weights 10 of the rotation shafts 9 are located within the frame module 5, which reduces the space requirement and allows the screening device to be designed to be more space-saving and smaller.
- Fig. 3 shows the screening device viewed from the outlet end and in a partially opened view.
- the angle of inclination is not fixed, as is usual in the prior art for such screening devices, but that the angle of inclination is infinitely adjustable.
- the angle of inclination is or are, as in Fig. 1 to 3 shown, one or more adjusting devices 20 are provided, which act on some or all of the suspension elements 3 in order to raise or lower one end of the sieve unit 2, and / or to lower or raise the other end of the sieve unit 2.
- Fig. 1 to 3 Show as a non-limiting example Fig. 1 to 3 two adjusting devices 20, which are attached to the support frame 1 at an outlet end of the screening device.
- the adjusting devices 20 are each designed as a ball screw 22 driven by a motor 24, with the respective associated suspension element 3 being attached to the spindle nut. If the adjusting devices 20 are controlled accordingly by a control unit (not shown), the respective associated suspension elements 3 can be raised or lowered in order to raise or lower the respective end of the sieve unit 2 in order to do so Adjust the tilt angle. So in the example the Fig. 1 and 2 With the two adjusting devices 20 provided at the outlet end of the sieve unit 2, the outlet end of the sieve unit 2 is raised, and thus the angle of inclination is reduced, or lowered, and thus the inclination angle is increased.
- the motors 24 are preferably designed as servo motors that are connected to a corresponding servo drive unit, and a sensor system, in particular a rotary encoder system or a linear scale system, can also be provided, which enables the angle of rotation of the motor axis or the linear position of the spindle nut to be determined.
- the servo motors can preferably be operated in a position control mode. Under the control of the control unit, it is possible for the two adjusting devices 20 to work synchronously when adjusting the angle of inclination, so that the sieve unit 2 can be raised equally and evenly on both sides. This is particularly advantageous if the angle of inclination is adjusted during operation, since in this way no undesirable tilting or lateral inclinations of the sieve unit 2 are triggered, which could disrupt operation.
- the inclination angle can also be determined mathematically from the data from the rotary encoder systems or the linear scale systems, so that a predeterminable and reproducible adjustment of the inclination angle is possible. For example, an operator can enter a desired angle of inclination via an input device, whereupon the control unit calculates corresponding target values for the adjustment devices 20 and outputs them to the adjustment devices 20. A control can be carried out on the basis of the actual values recorded by the sensors, with the control loop being carried out in the control unit or in the servomotor drive unit.
- an automatic tilt angle adjustment it is also possible to carry out an automatic tilt angle adjustment.
- one or more sensors can be provided for detecting the volume flow or the throughput quantity of material to be sieved or already sieved, with a corresponding target inclination angle, in particular an optimal one, based on the actual throughput quantity recorded in this way using a lookup table or using mathematical formulas Target inclination angle is determined, with the control device causing the actual, actual inclination angle to be adjusted towards the target inclination angle.
- the flow rate can also be adopted based on the flow rate specified by the system, in particular as a setting value of a higher-level system control.
- the automatic inclination angle adjustment can in particular be carried out in such a way that, by setting the respective assigned inclination angles, even for different or time-variable throughput quantities, it is effected that the sieve grids 7 of the sieve modules 4 are each filled with material to be sieved essentially over their entire length are occupied.
- corresponding sensors in the sieve modules 4 for example light barriers, which are arranged above the sieve grids 7 and running transversely to them, with which it can be recorded to what extent the sieve grids 7 are still covered with material to be sieved are.
- the sieve unit is suspended at 4 points, as in Fig. 1 to 3 shown, four adjustment devices 20 are provided, which cooperate with the four suspension elements 3, to adjust the angle of inclination by simultaneously raising one end and lowering the other end of the sieve unit 2. It is also possible to provide a suspension at more than four suspension points, for example at six suspension points, with four or six suspension elements 3 being assigned to corresponding adjustment devices 20.
- the adjusting device 20 is not limited to an embodiment as an electric motor-driven ball screw 22.
- a design as a hydraulically operated linear axis can also be considered.
- the use of hydraulics in the adjustment devices 20 offers the advantage that all hydraulic cylinders can be subjected to the same pressure, which ensures that all suspension elements 3 are loaded with essentially the same weight.
- suspension elements 3 can be designed not as articulated rods, but as steel cables.
- the adjusting devices 20 as winches driven by electric motors, which wind or unwind the steel cables (suspension elements 3) in order to adjust the angle of inclination.
- the steel cables are deflected by means of deflection rollers 30. This makes it possible, for example, to bring the steel cables from two sides of the sieve unit 2 together in order to attach them to an adjusting device 20, so that the two steel cables, and thus the two sides of the sieve unit 2, when adjusting the angle of inclination can be adjusted together and synchronously by the common adjustment device 20.
Description
Die vorliegende Erfindung betrifft eine Siebvorrichtung, bevorzugt vom sich kreisförmig bewegenden Typ, insbesondere bevorzugt zur Verwendung in einer Anlage zur Herstellung von Werkstoffplatten, nach dem Oberbegriff des Patentanspruchs 1. Eine derartige Siebvorrichtung geht beispielsweise aus der
Bei der Herstellung von Holzwerkstoffplatten werden in der Regel Siebvorrichtungen vom sich kreisförmig bewegenden Typ verwendet, um Holzwerkstoffrohmaterial nach dem Zerspanen oder Zerfasern und Trocknen in Fraktionen unterschiedlicher Größe zu sieben. Die so gesiebten, in Größenfraktionen getrennten Partikel können anschließend im Herstellungsprozess von Werkstoffplatten aus Holz verwendet werden, indem sie beispielsweise auf an sich bekannter Weise zu einer Holzwerkstoffmatte gestreut werden und die Matte in einer Durchlaufpresse zu einem Plattenstrang verpreßt wird. Der Plattenstrang kann anschließend zu einzelnen Holzwerkstoffplatten vereinzelt werden.In the production of wood-based panels, circular moving type screening devices are generally used to screen wood-based raw material into fractions of different sizes after chipping or defibration and drying. The particles sieved in this way and separated into size fractions can then be used in the manufacturing process of wooden material panels, for example by scattering them in a manner known per se to form a wood material mat and pressing the mat into a panel strand in a continuous press. The panel strand can then be separated into individual wood-based panels.
Derartige sich kreisförmig oder hin- und her bewegende Siebvorrichtungen sind typischerweise große Stahlkonstruktionen, bei denen eine geschweißte Stahlkonstruktion einen Tragrahmen der Vorrichtung bildet, an welchem die eigentliche Siebeinheit über Aufhängungselemente, die meist als gelenkig befestigte Stangen ausgeführt sind, aufgehängt ist. Die Siebeinheit kann sich so auf einer im Wesentlichen kreisförmigen Bahn in der horizontalen Ebene bewegen. Es handelt sich bevorzugt nicht um ein hin und her vibrierendes Sieb, sondern um ein Sieb mit kreisförmiger Bewegung, bei dem eine konstante zentripetale Beschleunigung, die sich um eine im Wesentlichen vertikale Achse dreht, das zu siebende Material auf und durch die Siebebenen bringt. Ein typischer Durchmesser einer Umlaufbahn beträgt 40-80 mm und die Umlaufgeschwindigkeit beträgt typisch 150-200 U/min.Such circular or reciprocating screening devices are typically large steel structures in which a welded steel structure forms a support frame of the device, on which the actual screening unit is suspended via suspension elements, which are usually designed as articulated rods. The screening unit can thus move on a substantially circular path in the horizontal plane. It is preferably not a sieve that vibrates back and forth, but rather a sieve of circular motion in which a constant centripetal acceleration, rotating about a substantially vertical axis, brings the material to be sieved onto and through the sieve planes. A typical diameter of an orbit is 40-80 mm and the orbital speed is typically 150-200 rpm.
Das Sieben erfolgt dabei üblicherweise mittels 2 bis 4 Siebstufen, die aus Siebgitter gebildet werden, die in Bezug auf die horizontale Ebene leicht geneigt sind. Der Neigungswinkel beträgt im Allgemeinen 5-10°. Der Das zu siebende Material fließt in Richtung der Neigung. Die Siebgitter sind über seitliche Türen oder Luken zugänglich, so dass sie entfernt und ausgetauscht werden können.Sieving is usually carried out using 2 to 4 sieving stages, which are formed from sieve grids that are slightly inclined with respect to the horizontal plane. The tilt angle is generally 5-10°. The material to be screened flows in the direction of the slope. The screen grids are accessible via side doors or hatches so they can be removed and replaced.
Die Siebvorrichtungen sind typischerweise große Stahlkonstruktionen, bei denen die Breite des Tragrahmens mehr als 3 m und die Länge des Tragrahmens im Allgemeinen zwischen 5 und 10 m beträgt. Darüber hinaus handelt es sich üblicher Weise um starre Konstruktionen mit festem Neigungswinkel. Eine Änderung des Neigungswinkels ist bei derartigen Siebvorrichtungen daher nicht oder nur schwer möglich.The screening devices are typically large steel structures where the width of the support frame is more than 3 m and the length of the support frame is generally between 5 and 10 m. In addition, they are usually rigid constructions with a fixed angle of inclination. A change in the angle of inclination is therefore not possible or only possible with difficulty in such screening devices.
Wie sich bei Laborversuchen der Anmelderin gezeigt hat, hat der Neigungswinkel einen großen Einfluss auf den Volumenstrom des Materials, das durch die Siebeinheit geführt und von dieser gesiebt wird. Insbesondere zeigen schon relativ kleine Unterschiede im Neigungswinkel deutliche Unterschiede hinsichtlich der maximalen Verweildauer von Partikeln auf dem Sieb. Auf Basis dieser Versuche wurde erkannt, dass sich - auch und insbesondere für im Betrieb wechselndes, unterschiedliches zu siebendes Material - über eine Verstellung des Neigungswinkels eine Optimierung hin zu einer höheren Staub- bzw. Feingutabsiebung (bei gegebener Sieblänge) erzielen lässt, oder dass für eine gegebene, gefordertes Niveau der Feingutabsiebung die Länge der Siebstrecke kürzer gewählt werden kann, was bedeutet, dass für einen gegebenen Durchlauf die Siebvorrichtung kleiner und damit kostengünstiger dimensioniert werden kann, bzw. dass für eine Siebvorrichtung gegebener Größe ein höherer maximaler Durchlauf ermöglicht wird.As has been shown in the applicant's laboratory tests, the angle of inclination has a large influence on the volume flow of the material that is passed through the sieve unit and sieved by it. In particular, even relatively small differences in the angle of inclination show clear differences in the maximum residence time of particles on the sieve. On the basis of these tests, it was recognized that - even and especially for different material to be screened during operation - an optimization towards a higher level of dust or fine material screening (for a given screen length) can be achieved by adjusting the inclination angle, or that for For a given, required level of fine material screening, the length of the screening section can be chosen to be shorter, which means that for a given run the screening device is smaller and This means that it can be dimensioned more cost-effectively, or that a higher maximum throughput is possible for a screening device of a given size.
Das Dokument
Es ist daher eine Aufgabe der vorliegenden Erfindung, eine Siebvorrichtung vom sich kreisförmig bewegenden Typ zur Verwendung in einer Anlage zur Holzwerkstoffplattenherstellung anzugeben, welche eine einfache und stufenlose Verstellung des Neigungswinkels, insbesondere auch während dem Betrieb der Siebvorrichtung, erlaubt.It is therefore an object of the present invention to provide a screening device of the circularly moving type for use in a plant for the production of wood-based panels, which allows a simple and continuous adjustment of the angle of inclination, in particular also during operation of the screening device.
Diese und andere Aufgaben der Erfindung werden gelöst mit einer Siebvorrichtung wie in Anspruch 1 angegeben. Bevorzugte Ausführungsformen sind in den abhängigen Ansprüchen dargelegt.These and other objects of the invention are achieved with a screening device as specified in claim 1. Preferred embodiments are set out in the dependent claims.
In einem Aspekt wird eine Siebvorrichtung zur Verwendung in einer Holzwerkstoffplattenherstellungsanlage angegeben, umfassend einen Tragrahmen und eine Siebeinheit, wobei die Siebeinheit über Aufhängungselemente an dem Tragrahmen aufgehängt ist, derart, dass die Siebeinheit sich auf einer kreisförmigen Trajektorie bewegen kann, wobei die Siebeinheit zumindest ein Siebmodul und eine Antriebseinrichtung aufweist, und wobei die Antriebseinrichtung eingerichtet ist, die Siebeinheit in eine kreisförmige Bewegung auf der kreisförmigen Trajektorie zu versetzen. Die Siebvorrichtung umfasst weiter zumindest eine elektromotorisch und/oder hydraulisch arbeitende Verstellvorrichtung vorgesehen ist, die eingerichtet ist, die Aufhängung der Siebeinheit an dem Tragrahmen mittels der Aufhängungselemente zu verstellen, um einen Neigungswinkels der Siebeinheit zu verstellen; und eine Steuereinheit zur Ansteuerung der zumindest einen Verstellvorrichtung.In one aspect, a screening device for use in a wood-based board manufacturing plant is provided, comprising a support frame and a screening unit, the screening unit being suspended from the support frame via suspension elements such that the screening unit can move on a circular trajectory, the screening unit having at least one screening module and has a drive device, and wherein the drive device is set up to set the sieve unit into a circular movement on the circular trajectory. The screening device further comprises at least one electric motor and/or hydraulically operating adjustment device, which is set up to adjust the suspension of the screening unit on the support frame by means of the suspension elements in order to adjust an angle of inclination of the screening unit; and a control unit for controlling the at least one adjustment device.
Mit Hilfe der elektromotorisch und/oder hydraulisch arbeitende Verstellvorrichtung(en) kann eine stufenlose Verstellung des Neigungswinkels, beispielsweise zwischen 4° und 12°, vorgenommen werden. Auch ist es zur Verstellung des Neigungswinkels nicht notwendig, dass mechanische Verbindungen oder Befestigungen gelöst werden, was die Verstellung des Neigungswinkels beträchtlich erleichtert. Auch ist es nicht notwendig, die Siebvorrichtung zur Verstellung des Neigungswinkels stillzusetzen, so dass es nunmehr möglich ist, den Neigungswinkel der Siebeinheit bei laufendem Siebbetrieb der Siebvorrichtung zu verstellen.With the help of the electric motor and/or hydraulically operating adjustment device(s), a continuous adjustment of the angle of inclination, for example between 4° and 12°, can be carried out. In order to adjust the angle of inclination, it is also not necessary for mechanical connections or fastenings to be loosened, which makes adjusting the angle of inclination considerably easier. It is also not necessary to stop the screening device to adjust the angle of inclination, so that it is now possible to adjust the angle of inclination of the screening unit while the screening device is in operation.
Die zumindest eine Verstellvorrichtung als elektromotorisch betriebene Kugelumlaufspindel oder als hydraulische Linearachse ausgebildet sein. Dabei kann bevorzugt weiter vorgesehen sein, dass die zumindest eine Verstellvorrichtung weiter ein Drehgebersystem und/oder ein Linearmaßstabsystem aufweist, wobei weiter eine Positionsregelung der zumindest einen Verstellvorrichtung auf Basis der Messwerte des Drehgebersystems und/oder des Linearmaßstabsystems ausgeführt wird, und/oder wobei auf Basis der Messwerte des Drehgebersystems und/oder des Linearmaßstabsystems die Steuereinrichtung eine Bestimmung des Ist-Neigungswinkels vornimmt.The at least one adjustment device can be designed as an electric motor-operated ball screw or as a hydraulic linear axis. Included It can preferably further be provided that the at least one adjustment device further has a rotary encoder system and / or a linear scale system, wherein further position control of the at least one adjustment device is carried out based on the measured values of the rotary encoder system and / or the linear scale system, and / or where on the basis of Measured values of the rotary encoder system and / or the linear scale system, the control device determines the actual inclination angle.
Weiterhin kann zumindest ein Sensor zur Ermittlung des Volumenstroms durch die Siebvorrichtung vorgesehen sein, und die Steuereinrichtung kann weiter eingerichtet sein, eine automatische Neigungswinkelverstellung auf Basis des ermittelten Volumenstroms vorzunehmen.Furthermore, at least one sensor can be provided for determining the volume flow through the sieve device, and the control device can further be set up to carry out an automatic inclination angle adjustment based on the determined volume flow.
Auf diese Weise kann eine automatische und optimale Winkelverstellung der Neigung abhängig von einem sich ändernden, tatsächlichen Volumenstrom ausgeführt und so der Betrieb der Siebvorrichtung optimiert werden.In this way, an automatic and optimal angle adjustment of the inclination can be carried out depending on a changing, actual volume flow and the operation of the screening device can thus be optimized.
Vorzugsweise sind die Aufhängungselemente als Stahlseile ausgeführt. Dabei kann auch vorgesehen sein, dass zwei als Stahlseil ausgebildete Aufhängungselemente über Umlenkrollen zu einer gemeinsamen Verstellvorrichtung geführt und von dieser betätigt werden.The suspension elements are preferably designed as steel cables. It can also be provided that two suspension elements designed as steel cables are guided via deflection rollers to a common adjustment device and actuated by it.
Das zumindest eine Siebmodul kann mehrere Siebgitter aufweisen, die übereinander angeordnet sind und unterschiedliche Maschengrößen aufweisen, um zu siebendes Holzrohmaterial in Fraktionen unterschiedlicher Größe zu sieben. Bevorzugt kann weiter zumindest eine Lichtschranke vorgesehen sein, die über ein Siebgitter quer zu diesem verlaufend angeordnet ist, zur Bestimmung, über welche Länge des Siebmoduls das Siebgitter mit zu siebendem Material belegt ist, wobei bevorzugt die Steuereinheit eingerichtet ist, eine automatische Neigungswinkelverstellung auf Basis des bestimmten Ergebnisses vorzunehmen. Auf diese Weise kann der Betrieb der Siebvorrichtung weiter optimiert werden.The at least one sieve module can have several sieve grids which are arranged one above the other and have different mesh sizes in order to sieve the raw wood material to be sieved into fractions of different sizes. Preferably, at least one light barrier can be provided, which is arranged over a sieve grid running transversely thereto, in order to determine over which length of the sieve module the sieve grid is covered with material to be sieved, the control unit preferably being set up to provide an automatic tilt angle adjustment based on the certain result. In this way, the operation of the screening device can be further optimized.
Anstelle der Lichtschranke sind auch andere Messsysteme oder Messvorrichtungen denkbar, beispielsweise optische Scanner, Reflektionsmessungen der Sieboberfläche, Lichtschranken für das durch den Sieb fallende Material, etc.Instead of the light barrier, other measuring systems or measuring devices are also conceivable, for example optical scanners, reflection measurements of the sieve surface, light barriers for the material falling through the sieve, etc.
Die Siebeinheit kann zwei Siebmodule und ein Rahmenmodul aufweisen, wobei das Rahmenmodul zwischen den Siebmodulen angeordnet ist. Dabei kann insbesondere die zumindest eine Antriebseinrichtung in dem Raum zwischen den Siebmodulen angeordnet sein. Auf diese Weise kann eine sehr kompakte Bauform erzielt werden.The sieve unit can have two sieve modules and a frame module, with the frame module being arranged between the sieve modules. In particular, the at least one drive device can be arranged in the space between the sieve modules. In this way, a very compact design can be achieved.
Im Folgenden wird die Erfindung mit Hilfe einiger bevorzugter Ausführungsformen unter Bezugnahme auf die beigefügten Zeichnungen näher beschrieben:The invention is described in more detail below with the aid of some preferred embodiments with reference to the accompanying drawings:
Es zeigt:
- Fig. 1
- eine Ansicht von schräg oben auf eine Siebvorrichtung gemäß einer Ausführungsform der Erfindung;
- Fig. 2
- das Rahmenmodul der Siebvorrichtung entsprechend der Ausführungsform und die Antriebsvorrichtungen des Rahmenmoduls;
- Fig. 3
- die Siebvorrichtung entsprechend der Ausführungsform von einem auslassseitigen Ende aus betrachtet und
- Fig. 4
- schematisch eine alternative Ausgestaltung einer Verstellvorrichtung zur Neigungswinkelverstellung.
- Fig. 1
- a view obliquely from above of a screening device according to an embodiment of the invention;
- Fig. 2
- the frame module of the screening device according to the embodiment and the drive devices of the frame module;
- Fig. 3
- the screening device according to the embodiment viewed from an outlet end and
- Fig. 4
- schematically an alternative embodiment of an adjusting device for adjusting the angle of inclination.
Die Siebeinheit 2 umfasst in dieser Ausführungsform zwei Siebmodule 4 und ein zwischen diesen angeordnetes Rahmenmodul 5. Das Rahmenmodul 5 fungiert dabei bevorzugt gleichzeitig als Träger und Befestigung für die Siebmodule 4.In this embodiment, the
Ein Siebmodul 4 umfasst eine oder mehrere Siebkammern, die im Wesentlichen übereinander angeordnet und strukturell voneinander getrennt sind, z.B. mit einer festen Zwischenebene, insbesondere einem Siebgitter 7. In jeder dieser Kammern, welche auch als Deck bezeichnet werden, wird das zu siebende Material in mindestens zwei Fraktionen gesiebt. In den Zeichnungen wird eine Ausführungsform dargestellt, bei der das Sieb zweideckig ist, d.h. es gibt in jedem Siebmodul 4 zwei übereinander angeordnete Siebkammern.A
Das zu siebende Material wird in die Aufgabetrichter gemäß den Pfeilen 6 zugeführt und die gesiebten Fraktionen werden vom anderen Ende des Siebes in an sich bekannter Weise abgeführt, wobei jede Fraktion auf ein eigenes Förderband abgegeben wird.The material to be sieved is fed into the feed hoppers according to the arrows 6 and the sieved fractions are removed from the other end of the sieve in a manner known per se, with each fraction being delivered onto its own conveyor belt.
Die Siebmodule 4 umfassen Siebgitter 7 (
Die kreisende Bewegung kann mit mindestens einer, in der Ausführungsform nach
Es ist vorgesehen, dass der Neigungswinkel nicht, wie im Stand der Technik für derartige Siebvorrichtungen üblich, fest vorgegeben ist, sondern, dass der Neigungswinkel stufenlos verstellbar ist. Hierzu ist bzw. sind, wie in
Als ein nicht beschränkendes Beispiel zeigen
Die Motoren 24 sind vorzugsweise als Servomotoren ausgebildet, die mit einer entsprechenden Servoantriebseinheit verbunden sind, wobei weiter ein Sensorsystem, insbesondere ein Drehgebersystem oder ein Linearmaßstabsystem, vorgesehen sein kann, das die Bestimmung des Drehwinkels der Motorachse bzw. der Linearposition der Spindelmutter ermöglicht. Die Servomotoren können dabei vorzugsweise in einem Positionsregelmodus betrieben werden. Unter Steuerung der Steuereinheit ist es so möglich, dass bei der Verstellung des Neigungswinkels die beiden Verstellvorrichtungen 20 synchron arbeiten, so dass die Siebeinheit 2 an beiden Seiten gleich und gleichmäßig angehoben werden kann. Dies ist besonders vorteilhaft, wenn die Verstellung des Neigungswinkels im laufenden Betrieb erfolgt, da auf diese Weise keine unerwünschten Verkippungen oder seitliche Neigungen der Siebeinheit 2 ausgelöst werden, welche den Betrieb stören könnten.The
Aus den Daten der Drehgebersysteme oder der Linearmaßstabsysteme lässt sich rechnerisch auch der Neigungswinkel bestimmen, so dass eine vorgebbare und reproduzierbare Einstellung des Neigungswinkels möglich wird. Beispielsweise kann ein Bediener über eine Eingabevorrichtung einen gewünschten Neigungswinkel eingeben, worauf die Steuereinheit entsprechende Sollwerte für die Verstellvorrichtungen 20 berechnet und an die Verstellvorrichtungen 20 ausgibt. Es kann dabei auf Basis der von den Sensoren erfassten Ist-Werte eine Regelung ausgeführt werden, wobei der Regelkreis in der Steuereinheit oder in der Servomotor-Antriebseinheit vorgenommen werden kann.The inclination angle can also be determined mathematically from the data from the rotary encoder systems or the linear scale systems, so that a predeterminable and reproducible adjustment of the inclination angle is possible. For example, an operator can enter a desired angle of inclination via an input device, whereupon the control unit calculates corresponding target values for the
Alternativ oder ergänzend ist es auch möglich, eine automatische Neigungswinkelverstellung vorzunehmen. Beispielsweise kann ein oder können mehrere Sensoren zur Erfassung des Volumenstroms bzw. der Durchlaufmenge an zu siebendem bzw. bereits gesiebten Material vorgesehen sein, wobei ausgehend von der so erfassten tatsächlichen Durchlaufmenge mittels einer Nachschlagetabelle oder mittels rechnerischer Formeln ein entsprechender Soll-Neigungswinkel, insbesondere ein optimaler Soll-Neigungswinkel bestimmt wird, wobei die Steuereinrichtung die Verstellung des tatsächlichen, Ist-Neigungswinkels hin zu dem Soll-Neigungswinkel veranlasst. Alternativ kann die Durchlaufmenge auch ausgehend von der anlagentechnisch vorgegebenen Durchlaufmenge, insbesondere als Einstellwert einer übergeordneten Anlagensteuerung, übernommen werden. Die automatische Neigungswinkelverstellung kann insbesondere so erfolgen, dass auf diese Weise bewirkt wird, dass unter Einstellung jeweiliger zugeordneter Neigungswinkel auch für unterschiedliche oder zeitlich variabler Durchlaufmengen jeweils bewirkt wird, dass die Siebgitter 7 der Siebmodule 4 jeweils im Wesentlichen über ihre gesamte Länge mit zu siebendem Material belegt sind. Alternativ oder ergänzend ist es auch möglich, in den Siebmodulen 4 entsprechende Sensoren vorzusehen, beispielsweise Lichtschranken, die über den Siebgittern 7 und quer zu diesen verlaufend, angeordnet sind, mit denen erfasst werden kann, wie weit die Siebgitter 7 noch mit zu siebendem Material belegt sind.Alternatively or additionally, it is also possible to carry out an automatic tilt angle adjustment. For example, one or more sensors can be provided for detecting the volume flow or the throughput quantity of material to be sieved or already sieved, with a corresponding target inclination angle, in particular an optimal one, based on the actual throughput quantity recorded in this way using a lookup table or using mathematical formulas Target inclination angle is determined, with the control device causing the actual, actual inclination angle to be adjusted towards the target inclination angle. Alternatively, the flow rate can also be adopted based on the flow rate specified by the system, in particular as a setting value of a higher-level system control. The automatic inclination angle adjustment can in particular be carried out in such a way that, by setting the respective assigned inclination angles, even for different or time-variable throughput quantities, it is effected that the
Während mit Bezug auf
So ist es beispielsweise möglich, dass im Fall einer Aufhängung der Siebeinheit an 4 Punkten, wie in
Darüber hinaus ist die Verstellvorrichtung 20 nicht auf eine Ausgestaltung als eine elektromotorisch angetriebene Kugelumlaufspindel 22 beschränkt. So kann auch eine Ausgestaltung als eine hydraulisch betriebene Linearachse in Betracht gezogen werden. Der Einsatz von Hydrauliken in den Verstellvorrichtungen 20 bietet dabei den Vorteil, dass alle Hydraulikzylinder mit demselben Druck beaufschlagt werden können, wodurch sichergesellt wird, dass alle Aufhängungselemente 3 mit im Wesentlichen derselben Gewichtskraft belastet werden.In addition, the adjusting
Weitere Ausgestaltungen der Verstellvorrichtungen werden dem Fachmann ohne weiteres ersichtlich sein.Further configurations of the adjustment devices will be readily apparent to those skilled in the art.
Weiter ist es möglich, dass die Aufhängungselemente 3 nicht als angelenkte Stäbe, sondern als Stahlseile ausgeführt sind. In diesem Fall ist es beispielsweise möglich, die Verstellvorrichtungen 20 als elektromotorisch angetriebene Winden auszugestalten, welche die als Stahlseile (Aufhängungselemente 3) aufwickeln bzw. abwickeln, um so den Neigungswinkel zu verstellen.It is also possible for the
Auch kann vorgesehen sein, dass wie in
Während es bevorzugt ist, die Verstellvorrichtungen 20, wie in
Auch ist es denkbar, anstelle der oder ergänzend zu den in den Verstellvorrichtungen 20 vorgesehenen Drehgebersystemen oder Linearmaßstabsystemen andere bzw. weitere Sensorsysteme vorzusehen, mit Hilfe derer sich der Ist-Neigungswinkel der Siebeinheit 2 erfassen lässt.It is also conceivable to provide other or additional sensor systems instead of or in addition to the rotary encoder systems or linear scale systems provided in the adjusting
Obwohl oben eine Ausführungsform beschrieben ist, die ein Rahmenmodul 5 und zwei Siebmodule 4 umfasst, ist dies nicht einschränkend, und es ist auch möglich, mehr als zwei Siebmodule 4 in Kombination mit einem oder mehreren Rahmenmodulen 5 zu verwenden.
- 1
- Tragrahmen
- 2
- Siebeinheit
- 3
- Aufhängungselement
- 4
- Siebmodul
- 5
- Rahmenmodul
- 6
- Materialzufuhr
- 7
- Siebgitter
- 8
- Antriebseinrichtung
- 9
- Drehachse
- 10
- Gewichte
- 11
- Explosionsklappe
- 12
- Flammenlöscheinrichtung
- 20
- Verstellvorrichtung
- 22
- Kugelumlaufspindel
- 24
- Motor
- 30
- Umlenkrolle
- 1
- Support frame
- 2
- Sieve unit
- 3
- Suspension element
- 4
- Sieve module
- 5
- Frame module
- 6
- Material supply
- 7
- Sieve grid
- 8th
- Drive device
- 9
- Axis of rotation
- 10
- Weights
- 11
- Explosion flap
- 12
- Flame extinguishing device
- 20
- Adjustment device
- 22
- Ball screw
- 24
- engine
- 30
- pulley
Claims (12)
- Screening device, in particular for use in a system for producing material panels, comprising a support frame (1) and a screening unit (2), wherein the screening unit (2) is suspended from the support frame (1) by means of suspension elements (3) in such a way that the screening unit (2) can preferably move on a circular trajectory, wherein the screening unit (2) comprises at least one screening module (4) and a drive device (8), and wherein the drive device (8) is arranged to set the screening unit (4) into a preferably circular movement on the circular trajectory,
characterized in that the screening device further comprises:
at least one electromotively and/or hydraulically operating adjusting device (20), which is adapted to adjust the suspension of the screening unit (2) on the support frame (1) by means of the suspension elements (3) in order to adjust an angle of inclination of the screening unit (2); and a control unit for controlling the at least one adjusting device (20). - Screening device according to claim 1, characterized in that the at least one adjusting device (20) is adapted to adjust the angle of inclination of the screening unit (2) during ongoing screening operation of the screening device.
- Screening device according to one of the preceding claims, characterized in that the angle of inclination is adjustable between 4° and 12°.
- Screening device according to one of the preceding claims, characterized in that the at least one adjusting device (20) is designed as an electromotively operated ball screw (22) or as a hydraulic linear axis.
- Screening device according to claim 4, characterized in that the at least one adjusting device (20) further comprises a rotary encoder system and/or a linear scale system, wherein further a position control of the at least one adjusting device (20) is carried out on the basis of the measured values of the rotary encoder system and/or the linear scale system, and/or wherein on the basis of the measured values of the rotary encoder system and/or the linear scale system the control device carries out a determination of the actual angle of inclination.
- Screening device according to claim 5, characterized in that further at least one sensor is provided for determining the volume flow through the screening device, wherein the control device is further adapted to perform an automatic inclination angle adjustment on the basis of the determined volume flow.
- Screening device according to one of the preceding claims, characterized in that the suspension elements (3) are designed as steel cables.
- Screening device according to claim 7, characterized in that two suspension elements (3) designed as steel cables are guided via deflection pulleys (30) to a common adjusting device (20) of the screening device and are actuated thereby.
- Screening device according to one of the preceding claims, characterized in that the at least one screening module (4) has a plurality of screening grids (7) which are arranged one above the other and have different mesh sizes in order to screen raw wood material to be screened into fractions of different sizes.
- Screening device according to one of the preceding claims, characterized in that at least one means is arranged for determining the occupancy of the screening grid (7) of a screening module with material to be screened, wherein preferably the control unit is adapted to perform an automatic inclination angle adjustment on the basis of the determined result.
- Screening device according to one of the preceding claims, characterized in that a light barrier, preferably transverse to the screen grid, an optical sensor, a camera system, means for determining the weight on a screening grid (7), systems for detecting in which areas material falls through the screen grid or the like are arranged as means for determining the occupancy.
- Screening device according to one of the preceding claims, characterized in that the screening unit (2) comprises two screening modules (4) and a frame module (5), wherein the frame module (5) is arranged between the screen modules (4).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI20195146A FI129210B (en) | 2019-02-28 | 2019-02-28 | A screen to be used in chipboard factories |
DE102019114041.2A DE102019114041A1 (en) | 2019-05-26 | 2019-05-26 | Sieving device, in particular for use in a plant for the production of material panels |
PCT/EP2020/055375 WO2020174099A1 (en) | 2019-02-28 | 2020-02-28 | Screening device, in particular for use in a system for producing material panels |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3930926A1 EP3930926A1 (en) | 2022-01-05 |
EP3930926B1 true EP3930926B1 (en) | 2023-10-11 |
Family
ID=69903083
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20712837.2A Active EP3930926B1 (en) | 2019-02-28 | 2020-02-28 | Screening device, in particular for use in a system for producing material panels |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3930926B1 (en) |
CN (1) | CN113710380B (en) |
WO (1) | WO2020174099A1 (en) |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH389365A (en) * | 1961-05-24 | 1965-03-15 | Buehler Ag Geb | Machine with a reciprocating, lying, elongated box |
CH631092A5 (en) * | 1978-05-02 | 1982-07-30 | Buehler Ag Geb | FREE-SWINGING PLANNERS. |
CA1246012A (en) * | 1983-05-16 | 1988-12-06 | Cecil T. Humphrey | Vertically spaced eccentric weight agitators in a multi-deck classifier |
KR920703218A (en) * | 1989-10-24 | 1992-12-17 | 더크 제이. 베네만 | Screen for sorting wood particles |
DE9309786U1 (en) * | 1993-07-01 | 1993-08-26 | Bfi Entsorgungstech | Device for separating material mixtures with adjustable selectivity |
US7331469B2 (en) * | 2004-04-29 | 2008-02-19 | Varco I/P, Inc. | Vibratory separator with automatically adjustable beach |
CN2756330Y (en) * | 2004-12-27 | 2006-02-08 | 杨大海 | Sieve angle hanging regulator for electromagnetic high frequency vibration sieve |
RU2383397C1 (en) * | 2008-10-13 | 2010-03-10 | Открытое акционерное общество "Научно-исследовательский и проектно-конструкторский институт асбестовой промышленности" | Unbalanced-throw screen |
US8061523B2 (en) * | 2009-03-31 | 2011-11-22 | Satake Corporation | Purifier |
DE202012003315U1 (en) * | 2012-03-30 | 2012-04-16 | Simatec Siebmaschinentechnik Gmbh | Sieving machine for classifying or processing gravel, sand or the like |
CN103394461B (en) * | 2013-08-16 | 2015-04-01 | 安徽理工大学 | Series-parallel vibrating screen with five degrees of freedom |
EP3160659A4 (en) | 2014-06-25 | 2018-03-07 | M-I L.L.C. | Modular gyratory sifter |
DE202016002402U1 (en) * | 2016-04-18 | 2017-07-20 | Volkmann Gmbh | Feeding device, screening device and conveyor |
-
2020
- 2020-02-28 CN CN202080030411.9A patent/CN113710380B/en active Active
- 2020-02-28 WO PCT/EP2020/055375 patent/WO2020174099A1/en unknown
- 2020-02-28 EP EP20712837.2A patent/EP3930926B1/en active Active
Also Published As
Publication number | Publication date |
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CN113710380A (en) | 2021-11-26 |
CN113710380B (en) | 2024-03-12 |
EP3930926A1 (en) | 2022-01-05 |
WO2020174099A1 (en) | 2020-09-03 |
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