WO2023081942A1 - Device for mounting a cutter head of a system for granulating plastics material - Google Patents
Device for mounting a cutter head of a system for granulating plastics material Download PDFInfo
- Publication number
- WO2023081942A1 WO2023081942A1 PCT/AT2022/060381 AT2022060381W WO2023081942A1 WO 2023081942 A1 WO2023081942 A1 WO 2023081942A1 AT 2022060381 W AT2022060381 W AT 2022060381W WO 2023081942 A1 WO2023081942 A1 WO 2023081942A1
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- WO
- WIPO (PCT)
- Prior art keywords
- cutter head
- shaft
- head shaft
- sleeve
- compensating sleeve
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
- B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
- B02C18/08—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives within vertical containers
- B02C18/086—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives within vertical containers specially adapted for disintegrating plastics, e.g. cinematographic films
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/02—Making granules by dividing preformed material
- B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
- B29B9/065—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion under-water, e.g. underwater pelletizers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
- B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
- B02C18/14—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives within horizontal containers
- B02C18/148—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives within horizontal containers specially adapted for disintegrating plastics, e.g. cinematographic films
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
- B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
- B02C18/16—Details
- B02C18/18—Knives; Mountings thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
- B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
- B26D1/12—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis
- B26D1/25—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member
- B26D1/26—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member moving about an axis substantially perpendicular to the line of cut
- B26D1/28—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member moving about an axis substantially perpendicular to the line of cut and rotating continuously in one direction during cutting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/02—Making granules by dividing preformed material
- B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/252—Drive or actuation means; Transmission means; Screw supporting means
- B29C48/2522—Shaft or screw supports, e.g. bearings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/252—Drive or actuation means; Transmission means; Screw supporting means
- B29C48/2528—Drive or actuation means for non-plasticising purposes, e.g. dosing unit
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0022—Combinations of extrusion moulding with other shaping operations combined with cutting
Definitions
- the invention relates to a device for mounting a cutter head of a plant for granulating plastic with a cutter head shaft, with a cutter head mount that can be connected non-rotatably to the cutter head shaft, and with an elastomeric compensating sleeve between the cutter head mount and the cutter head.
- the plastic melt is divided into a number of strands, which exit through a perforated plate into a housing and are cut into granules using a rotating cutter head Cooling and pumping medium is discharged from the housing.
- Cooling and pumping medium is discharged from the housing.
- any incorrect angular position of the cutterhead shaft relative to the perforated plate must be compensated for.
- universal and ball joints have the disadvantage, particularly in the case of underwater granulation, that they are susceptible to deposits that affect the ease of movement of these joints.
- the invention is therefore based on the object of providing a constructively simple mounting of the cutter head, which allows angular errors between the cutter head shaft and the perforated plate to be compensated for with the aid of an elastomeric compensation sleeve, without having to fear difficulties in relation to the torque transmission from the cutter head shaft to the cutter head.
- the invention solves the problem in that the compensating sleeve has a non-circular cross-section with a centroid that lies on the axis of rotation of the cutter head shaft.
- the transmission of torque from the cutter head mount to the cutter head via the elastomeric compensation sleeve does not depend on the bonding between the compensation sleeve on the one hand and the cutter head mount or the cutter head carrier on the other hand, because due to the cross-sectional shape of the compensation sleeve deviating from a circular shape, the cutter head and the cutter head holder cannot be twisted against each other at will, even without a compensating sleeve.
- a relative rotation between the cutter head and the cutter head mount is therefore only possible within the scope of the deformability of the peripheral wall of the compensating sleeve between the opposing peripheral surfaces of the cutter head mount and the cutter head possible, whereby the torque transmission is not impaired.
- the centroid of the area of the cross section of the compensating sleeve lying on the axis of rotation of the cutter head shaft ensures in a simple manner a corresponding mass balance in relation to the axis of rotation.
- Particularly advantageous design conditions result from the fact that the cutter head receptacle, which engages in a recess in the cutter head, forms an end wall supported on the front end of the cutter head shaft and covered by a base of the pot-like compensation sleeve, and that the cutter head receptacle forms the end wall with the aid of an end wall inserted into an axial through-opening of the cutter head the cutter head receptacle is fastened to the front end of the cutter head shaft connecting fastening screw on the cutter head shaft.
- the cutter head receptacle which forms a jacket surrounding the cutter head shaft and an end wall supported on the front end of the cutter head shaft, engages in a recess in the cutter head and the compensating sleeve is cup-shaped in accordance with the cutter head receptacle, the bottom of the pot-like compensating sleeve is also effectively covered by the cutter head That the temperature load of the elastomeric compensation sleeve can be easily kept in a permissible range.
- the fastening screw for the cutter head mount provided in an axial passage opening of the cutter head connects the end wall of the cutter head mount to the front end of the cutter head shaft, without impeding the compensating movement required for the cutter head, because this fastening screw only holds the end wall of the cutter head mount positively in relation to the cutter head shaft, but not the cutter head, which is held by the elastomeric compensating sleeve, which encloses the cutter head receptacle in a cup-like manner, so that it can be pivoted to a limited extent on all sides in relation to the cutter head receptacle.
- compensating sleeves with an oval cross-section meet the requirements of the invention, simpler manufacturing conditions result if the cross-section of the compensating sleeve is in the shape of a polygon, namely in With regard to the required position of the centroid, in particular the shape of a regular polygon coaxial to the axis of rotation of the cutter head shaft.
- FIG. 1 shows a device according to the invention for mounting a cutter head of a plant for granulating plastic in a section through the cutter head receptacle perpendicular to the cutter head shaft and
- FIG. 2 shows a section along the line II-II of FIG. 1 .
- a plant for granulating plastic has a perforated plate 1 through which melt strands exit into a housing with the aid of nozzles 2 and are cut into granules by knives 3 of a rotating cutter head 4, which are then Cooling and pumping medium flowing through the housing, for example water, solidifies and is discharged with the cooling and pumping medium from the housing.
- the cutters 3 are arranged on cutter carriers 5 which are held in a form-fitting manner in mounting bores 6 of the cutter head 4 using dowel pins 7 .
- a cutter head shaft 8 is used to drive the cutter head 4, with the requirement that the cutters 3 must be guided along the surface of the perforated plate 1 and parallel thereto. This requires an axis of rotation perpendicular to the perforated plate 1, which, however, cannot be expected due to the unavoidable tolerances. For this reason, the cutter head 4 is to be mounted so that it can be pivoted on all sides to a limited extent relative to the cutter head shaft 8 .
- the cutter head 4 is not mounted directly on the cutter head shaft 8, but with the help of a cutter head receptacle 9, between which and the cutter head 4 is an elastomeric compensation sleeve 10 with a cross section in the form a regular polygon is provided, as can be seen in particular from FIG.
- This cup-shaped compensating sleeve 10 not only encloses the jacket 11 of the cutter head receptacle 9, but also covers the end wall 13 of the cutter head receptacle 9 with its base 12, which engages in a recess 14 of the cutter head 4 with the interposed compensating sleeve 10.
- a fastening screw 16 which is arranged in an axial passage opening 17 of the cutter head 4 and which fastens the end wall 13 of the cutter head receptacle 9 to the front end 18 of the Cutter head shaft 8 connects, so that the cutter head receptacle 9 is held positively on the front end 18 of the cutter shaft 8.
- the cutter head 4 Since the cutter head 4 is connected to the cutter head receptacle 9 by the pot-like, elastomeric compensation sleeve 10, the cutter head 4 is held within the scope of the elastic deformability of the compensation sleeve 10 so that it can pivot to a limited extent relative to the cutter head shaft 8 on all sides, so that this cutter head bearing means that the cutter head can be guided along the perforated plate 1 cutters 3 parallel to the perforated plate, which are supported on the perforated plate 1, without having to forego a form-fitting torque transmission which, due to the cross-sectional shape deviating from a circular shape, does not depend on the bonding between the compensating sleeve 10 on the one hand and the cutter head receptacle 9 or the cutter head 4 on the other .
- the requirements for the adhesive connection required to hold the cutter head 4 on the cutter head receptacle 9 are comparatively low because it is not exposed to any particular stresses during operation.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Food Science & Technology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Forests & Forestry (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
The invention relates to a device for mounting a cutter head (4) of a system for granulating plastics material, the device comprising: a cutter head shaft (8); a cutter head holder (9), which can be connected for conjoint rotation to the cutter head shaft (8); and an elastomer compensation sleeve (10) between the cutter head holder (9) and the cutter head (4). In order to provide advantageous design conditions, according to the invention the compensation sleeve (10) comprises a non-circular cross-section that has a centroid on the rotational axis of the cutter head shaft (8).
Description
Vorrichtung zur Lagerung eines Messerkopfs einer Anlage zum Granulieren von Kunststoff Device for mounting a cutter head of a plant for granulating plastic
Technisches Gebiet technical field
Die Erfindung bezieht sich auf eine Vorrichtung zur Lagerung eines Messerkopfs einer Anlage zum Granulieren von Kunststoff mit einer Messerkopfwelle, mit einer drehfest mit der Messerkopfwelle verbindbaren Messerkopfaufnahme und mit einer elastomeren Ausgleichshülse zwischen der Messerkopfaufnahme und dem Messerkopf. The invention relates to a device for mounting a cutter head of a plant for granulating plastic with a cutter head shaft, with a cutter head mount that can be connected non-rotatably to the cutter head shaft, and with an elastomeric compensating sleeve between the cutter head mount and the cutter head.
Stand der Technik State of the art
In Anlagen zum Granulieren von Kunststoff wird die Kunststoffschmelze in eine Anzahl von Strängen aufgeteilt, die durch eine Lochplatte hindurch in ein Gehäuse austreten und mithilfe eines rotierenden Messerkopfs zu einem Granulat geschnitten werden, das in einem das Gehäuse durchströmenden Kühl- und Fördermedium erstarrt und mit dem Kühl- und Fördermedium aus dem Gehäuse ausgetragen wird. Um eine zur Lochplatte parallele Messerführung zu gewährleisten, muss eine allfällige Winkelfehlstellung der Messerkopfwelle gegenüber der Lochplatte ausgeglichen werden. Zu diesem Zweck ist es bekannt, zwischen dem Messerkopf und der Messerkopfwelle ein Kreuz- oder Kugelgelenk vorzusehen. Kreuz- und Kugelgelenke haben aber neben dem mit ihrem Einsatz verbundenen Konstruktionsaufwand insbesondere bei einer Unterwassergranulation den Nachteil, anfällig gegenüber Ablagerungen zu sein, die Einfluss auf die Leichtgängigkeit dieser Gelenke haben. In systems for granulating plastic, the plastic melt is divided into a number of strands, which exit through a perforated plate into a housing and are cut into granules using a rotating cutter head Cooling and pumping medium is discharged from the housing. In order to ensure that the knife is guided parallel to the perforated plate, any incorrect angular position of the cutterhead shaft relative to the perforated plate must be compensated for. For this purpose it is known to provide a universal or ball joint between the cutter head and the cutter head shaft. However, in addition to the design complexity associated with their use, universal and ball joints have the disadvantage, particularly in the case of underwater granulation, that they are susceptible to deposits that affect the ease of movement of these joints.
Um diesen Nachteilen zu begegnen, wurde bereits vorgeschlagen, zwischen dem Messerkopf und der Messerkopfwelle eine Messerkopfaufnehme vorzusehen, die drehfest mit der Messerkopfwelle verbindbar ist und den Messerkopf unter
Zwischenschaltung einer elastomeren, kreiszylindrischen Ausgleichshülse trägt, sodass der Messerkopf im Rahmen der elastischen Verformbarkeit der Ausgleichshülse allseitig begrenzt verschwenkbar auf der Messerkopfwelle gehalten wird. Beim Einsatz elastomerer Ausgleichshülsen besteht allerdings die Gefahr einer Überlastung der Haftverbindung zwischen der Ausgleichshülse einerseits und der Messerkopfaufnahme bzw. dem Messerkopf anderseits, sodass unter Umständen das notwendige Drehmoment nicht mehr auf den Messerkopf übertragen werden kann. In order to counteract these disadvantages, it has already been proposed to provide a cutter head receptacle between the cutter head and the cutter head shaft, which can be connected in a rotationally fixed manner to the cutter head shaft and supports the cutter head Interposition of an elastomeric, circular-cylindrical compensating sleeve carries, so that the cutter head is held on the cutter head shaft so that it can pivot to a limited extent on all sides within the scope of the elastic deformability of the compensating sleeve. When using elastomeric compensating sleeves, however, there is a risk of overloading the adhesive connection between the compensating sleeve on the one hand and the cutter head mount or the cutter head on the other hand, so that the necessary torque can no longer be transmitted to the cutter head.
Darstellung der Erfindung Presentation of the invention
Der Erfindung liegt somit die Aufgabe zugrunde, eine konstruktiv einfache Lagerung des Messerkopfs vorzusehen, die einen Ausgleich von Winkelfehlern zwischen der Messerkopfwelle und der Lochplatte mithilfe einer elastomeren Ausgleichshülse erlaubt, ohne Schwierigkeiten in Bezug auf die Drehmomentübertragung von der Messerkopfwelle auf den Messerkopf befürchten zu müssen. The invention is therefore based on the object of providing a constructively simple mounting of the cutter head, which allows angular errors between the cutter head shaft and the perforated plate to be compensated for with the aid of an elastomeric compensation sleeve, without having to fear difficulties in relation to the torque transmission from the cutter head shaft to the cutter head.
Ausgehend von einer Vorrichtung der eingangs geschilderten Art löst die Erfindung die gestellte Aufgabe dadurch, dass die Ausgleichshülse einen von der Kreisform abweichenden Querschnitt mit einem Flächenschwerpunkt aufweist, der auf der Drehachse der Messerkopfwelle liegt. Based on a device of the type described above, the invention solves the problem in that the compensating sleeve has a non-circular cross-section with a centroid that lies on the axis of rotation of the cutter head shaft.
Zufolge dieser Maßnahmen kommt es für die Drehmomentübertragung von der Messerkopfaufnahme auf den Messerkopf über die elastomere Ausgleichshülse nicht auf die Haftvermittlung zwischen der Ausgleichshülse einerseits und der Messerkopfaufnahme bzw. dem Messerkopfträger anderseits an, weil aufgrund der von einer Kreisform abweichenden Querschnittsform der Ausgleichshülse der Messerkopf und die Messerkopfaufnahme auch ohne Ausgleichshülse nicht beliebig gegeneinander verdreht werden können. Eine Relativdrehung zwischen dem Messerkopf und der Messerkopfaufnahme ist somit lediglich im Rahmen der Verformbarkeit der Umfangswand der Ausgleichshülse zwischen den einander gegenüberliegenden Umfangsflächen der Messerkopfaufnahme und des
Messerkopfs möglich, wodurch die Drehmomentübertragung jedoch nicht beeinträchtigt wird. Der auf der Drehachse der Messerkopfwelle liegende Flächenschwerpunkt des Querschnitts der Ausgleichshülse sichert in einfacher Art einen entsprechenden Massenausgleich in Bezug auf die Drehachse. As a result of these measures, the transmission of torque from the cutter head mount to the cutter head via the elastomeric compensation sleeve does not depend on the bonding between the compensation sleeve on the one hand and the cutter head mount or the cutter head carrier on the other hand, because due to the cross-sectional shape of the compensation sleeve deviating from a circular shape, the cutter head and the cutter head holder cannot be twisted against each other at will, even without a compensating sleeve. A relative rotation between the cutter head and the cutter head mount is therefore only possible within the scope of the deformability of the peripheral wall of the compensating sleeve between the opposing peripheral surfaces of the cutter head mount and the cutter head possible, whereby the torque transmission is not impaired. The centroid of the area of the cross section of the compensating sleeve lying on the axis of rotation of the cutter head shaft ensures in a simple manner a corresponding mass balance in relation to the axis of rotation.
Besonders vorteilhafte Konstruktionsbedingungen ergeben sich dadurch, dass die in eine Ausnehmung des Messerkopfs eingreifende Messerkopfaufnahme eine am stirnseitigen Ende der Messerkopfwelle abgestützte, von einem Boden der topfartigen Ausgleichshülse abgedeckte Stirnwand bildet, und dass die Messerkopfaufnahme mithilfe einer in eine axiale Durchtrittsöffnung des Messerkopfs eingesetzten, die Stirnwand der Messerkopfaufnahme mit dem stirnseitigen Ende der Messerkopfwelle verbindenden Befestigungsschraube auf der Messerkopfwelle befestigt ist. Da die Messerkopfaufnahme, die einen die Messerkopfwelle umschließenden Mantel und eine am stirnseitigen Ende der Messerkopfwelle abgestützte Stirnwand bildet, in eine Ausnehmung des Messerkopfs eingreift und die Ausgleichshülse entsprechend der Messerkopfaufnahme topfartig ausgebildet ist, wird auch der Boden der topfartigen Ausgleichshülse vom Messerkopf mit der Wirkung abgedeckt, dass die Temperaturbelastung der elastomeren Ausgleichshülse ohne Weiteres in einem zulässigen Bereich gehalten werden kann. Die in einer axialen Durchtrittsöffnung des Messerkopfs vorgesehene Befestigungsschraube für die Messerkopfaufnahme verbindet die Stirnwand der Messerkopfaufnahme mit dem stirnseitigen Ende der Messerkopfwelle, ohne die für den Messerkopf erforderliche Ausgleichsbewegung zu behindern, weil diese Befestigungsschraube lediglich die Stirnwand der Messerkopfaufnahme formschlüssig gegenüber der Messerkopfwelle festhält, nicht aber den Messerkopf, der durch die die Messerkopfaufnahme topfartig umschließende, elastomere Ausgleichshülse allseitig begrenzt verschwenkbar gegenüber der Messerkopfaufnahme gehalten wird. Particularly advantageous design conditions result from the fact that the cutter head receptacle, which engages in a recess in the cutter head, forms an end wall supported on the front end of the cutter head shaft and covered by a base of the pot-like compensation sleeve, and that the cutter head receptacle forms the end wall with the aid of an end wall inserted into an axial through-opening of the cutter head the cutter head receptacle is fastened to the front end of the cutter head shaft connecting fastening screw on the cutter head shaft. Since the cutter head receptacle, which forms a jacket surrounding the cutter head shaft and an end wall supported on the front end of the cutter head shaft, engages in a recess in the cutter head and the compensating sleeve is cup-shaped in accordance with the cutter head receptacle, the bottom of the pot-like compensating sleeve is also effectively covered by the cutter head That the temperature load of the elastomeric compensation sleeve can be easily kept in a permissible range. The fastening screw for the cutter head mount provided in an axial passage opening of the cutter head connects the end wall of the cutter head mount to the front end of the cutter head shaft, without impeding the compensating movement required for the cutter head, because this fastening screw only holds the end wall of the cutter head mount positively in relation to the cutter head shaft, but not the cutter head, which is held by the elastomeric compensating sleeve, which encloses the cutter head receptacle in a cup-like manner, so that it can be pivoted to a limited extent on all sides in relation to the cutter head receptacle.
Obwohl im Querschnitt ovale Ausgleichshülsen den erfindungsgemäßen Vorgaben durchaus genügen, ergeben sich einfachere Fertigungsbedingungen, wenn der Querschnitt der Ausgleichshülse die Form eines Polygons aufweist, und zwar im
Hinblick auf die geforderte Lage des Flächenschwerpunkts insbesondere die Form eines zur Drehachse der Messerkopfwelle koaxialen regelmäßigen Polygons. Although compensating sleeves with an oval cross-section meet the requirements of the invention, simpler manufacturing conditions result if the cross-section of the compensating sleeve is in the shape of a polygon, namely in With regard to the required position of the centroid, in particular the shape of a regular polygon coaxial to the axis of rotation of the cutter head shaft.
Kurze Beschreibung der Erfindung Brief description of the invention
In der Zeichnung ist der Erfindungsgegenstand beispielsweise dargestellt. Es zeigen In the drawing, the subject of the invention is shown as an example. Show it
Fig. 1 eine erfindungsgemäße Vorrichtung zur Lagerung eines Messerkopfs einer Anlage zum Granulieren von Kunststoff in einem Schnitt durch die Messerkopfaufnahme senkrecht zur Messerkopfwelle und 1 shows a device according to the invention for mounting a cutter head of a plant for granulating plastic in a section through the cutter head receptacle perpendicular to the cutter head shaft and
Fig. 2 einen Schnitt nach der Linie ll-ll der Fig. 1 . FIG. 2 shows a section along the line II-II of FIG. 1 .
Wege zur Ausführung der Erfindung Ways to carry out the invention
Wie in der Fig. 2 angedeutet ist, weist eine Anlage zum Granulieren von Kunststoff eine Lochplatte 1 auf, durch die Schmelzestränge mithilfe von Düsen 2 in ein Gehäuse austreten und durch Messer 3 eines rotierenden Messerkopfs 4 zu einem Granulat geschnitten werden, das in einem das Gehäuse durchströmenden Kühl- und Fördermedium, beispielsweise Wasser, erstarrt und mit dem Kühl- und Fördermedium aus dem Gehäuse ausgetragen wird. As indicated in Fig. 2, a plant for granulating plastic has a perforated plate 1 through which melt strands exit into a housing with the aid of nozzles 2 and are cut into granules by knives 3 of a rotating cutter head 4, which are then Cooling and pumping medium flowing through the housing, for example water, solidifies and is discharged with the cooling and pumping medium from the housing.
Die Messer 3 sind auf Messerträgem 5 angeordnet, die in Aufnahmebohrungen 6 des Messerkopfs 4 mithilfe von Passstiften 7 formschlüssig gehalten werden. Zum Antrieb des Messerkopfs 4 dient eine Messerkopfwelle 8, wobei die Forderung besteht, dass die Messer 3 entlang der Oberfläche der Lochplatte 1 und parallel dazu zu führen sind. Dies setzt eine zur Lochplatte 1 senkrechte Drehachse voraus, womit allerdings aufgrund der unvermeidbaren Toleranzen nicht gerechnet werden kann. Aus diesem Grund ist der Messerkopf 4 gegenüber der Messerkopfwelle 8 allseits begrenzt verschwenkbar zu lagern. The cutters 3 are arranged on cutter carriers 5 which are held in a form-fitting manner in mounting bores 6 of the cutter head 4 using dowel pins 7 . A cutter head shaft 8 is used to drive the cutter head 4, with the requirement that the cutters 3 must be guided along the surface of the perforated plate 1 and parallel thereto. This requires an axis of rotation perpendicular to the perforated plate 1, which, however, cannot be expected due to the unavoidable tolerances. For this reason, the cutter head 4 is to be mounted so that it can be pivoted on all sides to a limited extent relative to the cutter head shaft 8 .
Zu diesem Zweck ist der Messerkopf 4 nicht unmittelbar auf der Messerkopfwelle 8 gelagert, sondern mithilfe einer Messerkopfaufnahme 9, zwischen der und dem Messerkopf 4 eine elastomere Ausgleichshülse 10 mit einem Querschnitt in Form
eines regelmäßigen Polygons vorgesehen ist, wie dies insbesondere der Fig. 1 entnommen werden kann. Diese topfartig ausgebildete Ausgleichshülse 10 umschließt nicht nur den Mantel 11 der Messerkopfaufnahme 9, sondern deckt auch mit ihrem Boden 12 die Stirnwand 13 der Messerkopfaufnahme 9 ab, die unter Zwischenlage der Ausgleichshülse 10 in eine Ausnehmung 14 des Messerkopfs 4 eingreift. For this purpose, the cutter head 4 is not mounted directly on the cutter head shaft 8, but with the help of a cutter head receptacle 9, between which and the cutter head 4 is an elastomeric compensation sleeve 10 with a cross section in the form a regular polygon is provided, as can be seen in particular from FIG. This cup-shaped compensating sleeve 10 not only encloses the jacket 11 of the cutter head receptacle 9, but also covers the end wall 13 of the cutter head receptacle 9 with its base 12, which engages in a recess 14 of the cutter head 4 with the interposed compensating sleeve 10.
Zur Befestigung der Messerkopfaufnahme 9, die mithilfe einer Nut- Federverbindung 15 drehfest gegenüber der Messerkopfwelle 8 festgelegt ist, dient eine Befestigungsschraube 16, die in einer axialen Durchtrittsöffnung 17 des Messerkopfs 4 angeordnet ist und die Stirnwand 13 der Messerkopfaufnahme 9 mit dem stirnseitigen Ende 18 der Messerkopfwelle 8 verbindet, sodass die Messerkopfaufnahme 9 formschlüssig auf dem stirnseitigen Ende 18 der Messerwelle 8 festgehalten wird. Da der Messerkopf 4 durch die topfartige, elastomere Ausgleichshülse 10 mit der Messerkopfaufnahme 9 verbunden ist, wird der Messerkopf 4 im Rahmen der elastischen Verformbarkeit der Ausgleichshülse 10 allseitig begrenzt verschwenkbar gegenüber der Messerkopfwelle 8 gehalten, sodass durch diese Messerkopflagerung eine Messerführung entlang der Lochplatte 1 mit sich an der Lochplatte 1 abstützenden, lochplattenparallelen Messern 3 möglich wird, ohne auf eine formschlüssige Drehmomentübertragung verzichten zu müssen, die aufgrund der von einer Kreisform abweichenden Querschnittsform nicht von der Haftvermittlung zwischen der Ausgleichshülse 10 einerseits und der Messerkopfaufnahme 9 bzw. dem Messerkopf 4 anderseits abhängt. Die Anforderungen an die für den Halt des Messerkopfs 4 auf der Messerkopfaufnahme 9 erforderliche Haftverbindung sind vergleichsweise gering, weil sie während des Betriebs keinen besonderen Belastungen ausgesetzt ist.
A fastening screw 16, which is arranged in an axial passage opening 17 of the cutter head 4 and which fastens the end wall 13 of the cutter head receptacle 9 to the front end 18 of the Cutter head shaft 8 connects, so that the cutter head receptacle 9 is held positively on the front end 18 of the cutter shaft 8. Since the cutter head 4 is connected to the cutter head receptacle 9 by the pot-like, elastomeric compensation sleeve 10, the cutter head 4 is held within the scope of the elastic deformability of the compensation sleeve 10 so that it can pivot to a limited extent relative to the cutter head shaft 8 on all sides, so that this cutter head bearing means that the cutter head can be guided along the perforated plate 1 cutters 3 parallel to the perforated plate, which are supported on the perforated plate 1, without having to forego a form-fitting torque transmission which, due to the cross-sectional shape deviating from a circular shape, does not depend on the bonding between the compensating sleeve 10 on the one hand and the cutter head receptacle 9 or the cutter head 4 on the other . The requirements for the adhesive connection required to hold the cutter head 4 on the cutter head receptacle 9 are comparatively low because it is not exposed to any particular stresses during operation.
Claims
1 . Vorrichtung zur Lagerung eines Messerkopfs (4) einer Anlage zum Granulieren von Kunststoff mit einer Messerkopfwelle (8), mit einer drehfest mit der Messerkopfwelle (8) verbindbaren Messerkopfaufnahme (9) und mit einer elastomeren Ausgleichshülse (10) zwischen der Messerkopfaufnahme (9) und dem Messerkopf (4), dadurch gekennzeichnet, dass die Ausgleichshülse (10) einen von der Kreisform abweichenden Querschnitt mit einem Flächenschwerpunkt aufweist, der auf der Drehachse der Messerkopfwelle (8) liegt. 1 . Device for mounting a cutter head (4) of a plant for granulating plastic with a cutter head shaft (8), with a cutter head mount (9) which can be connected in a rotationally fixed manner to the cutter head shaft (8) and with an elastomeric compensating sleeve (10) between the cutter head mount (9) and the cutter head (4), characterized in that the compensating sleeve (10) has a non-circular cross-section with a centroid which lies on the axis of rotation of the cutter head shaft (8).
2. Vorrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass die in eine Ausnehmung (14) des Messerkopfs (4) eingreifende Messerkopfaufnahme (9) eine am stirnseitigen Ende (18) der Messerkopfwelle (8) abgestützte, von einem Boden (12) der topfartigen Ausgleichshülse (10) abgedeckte Stirnwand (13) bildet, und dass die Messerkopfaufnahme (9) mithilfe einer in eine axiale Durchtrittsöffnung (17) des Messerkopfs (4) eingesetzten, die Stirnwand (13) der Messerkopfaufnahme (9) mit dem stirnseitigen Ende (18) der Messerkopfwelle (8) verbindenden Befestigungsschraube (16) auf der Messerkopfwelle (8) befestigt ist. 2. Device according to claim 1, characterized in that the cutter head receptacle (9) engaging in a recess (14) of the cutter head (4) is supported on the front end (18) of the cutter head shaft (8) and is supported by a base (12) of the pot-like end wall (13) covered by the compensating sleeve (10), and that the cutter head receptacle (9) is connected to the front end (18 ) the fastening screw (16) connecting the cutter head shaft (8) is fastened on the cutter head shaft (8).
3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Querschnitt der Ausgleichshülse (10) die Form eines Polygons aufweist. 3. Device according to claim 1 or 2, characterized in that the cross section of the compensating sleeve (10) has the shape of a polygon.
4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass die Querschnittsform der Ausgleichshülse (10) ein regelmäßiges Polygon bildet.
4. The device according to claim 3, characterized in that the cross-sectional shape of the compensating sleeve (10) forms a regular polygon.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ATA50886/2021A AT524852B1 (en) | 2021-11-09 | 2021-11-09 | Device for mounting a cutter head of a plant for granulating plastic |
ATA50886/2021 | 2021-11-09 |
Publications (1)
Publication Number | Publication Date |
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WO2023081942A1 true WO2023081942A1 (en) | 2023-05-19 |
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ID=83593804
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/AT2022/060381 WO2023081942A1 (en) | 2021-11-09 | 2022-11-07 | Device for mounting a cutter head of a system for granulating plastics material |
Country Status (2)
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AT (1) | AT524852B1 (en) |
WO (1) | WO2023081942A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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AT524852B1 (en) * | 2021-11-09 | 2022-10-15 | Econ Gmbh | Device for mounting a cutter head of a plant for granulating plastic |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3196487A (en) * | 1963-07-18 | 1965-07-27 | Du Pont | Melt cutter apparatus |
DE19809800C1 (en) * | 1998-03-09 | 1999-04-08 | Goetz Gmbh Spezialkuttermesser | Cutter blade holder |
US20020150641A1 (en) * | 2001-04-12 | 2002-10-17 | Kelly Ready | Underwater pelletizer and cutting system therefor |
JP2004017548A (en) * | 2002-06-19 | 2004-01-22 | Japan Steel Works Ltd:The | Cutter head of granulation apparatus |
DE202009014313U1 (en) * | 2009-10-22 | 2010-03-25 | Götz GmbH - Kuttermesser & Schleiferei | cutter |
DE102018106878A1 (en) * | 2018-03-22 | 2019-09-26 | Börger GmbH | Crusher with at least one perforated disc and with at least one of the perforated disc associated knife |
AT524852B1 (en) * | 2021-11-09 | 2022-10-15 | Econ Gmbh | Device for mounting a cutter head of a plant for granulating plastic |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5143307A (en) * | 1991-03-11 | 1992-09-01 | Lundquist Lynn C | Secondary cutter apparatus for plastic size reduction equipment |
JP5463786B2 (en) * | 2009-08-07 | 2014-04-09 | マックス株式会社 | 厨 芥 Processing device |
DE202014003409U1 (en) * | 2014-04-22 | 2014-04-30 | Automatik Plastics Machinery Gmbh | Guide roller of a feed roller pair of a granulator |
-
2021
- 2021-11-09 AT ATA50886/2021A patent/AT524852B1/en active
-
2022
- 2022-11-07 WO PCT/AT2022/060381 patent/WO2023081942A1/en unknown
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3196487A (en) * | 1963-07-18 | 1965-07-27 | Du Pont | Melt cutter apparatus |
DE19809800C1 (en) * | 1998-03-09 | 1999-04-08 | Goetz Gmbh Spezialkuttermesser | Cutter blade holder |
US20020150641A1 (en) * | 2001-04-12 | 2002-10-17 | Kelly Ready | Underwater pelletizer and cutting system therefor |
JP2004017548A (en) * | 2002-06-19 | 2004-01-22 | Japan Steel Works Ltd:The | Cutter head of granulation apparatus |
DE202009014313U1 (en) * | 2009-10-22 | 2010-03-25 | Götz GmbH - Kuttermesser & Schleiferei | cutter |
DE102018106878A1 (en) * | 2018-03-22 | 2019-09-26 | Börger GmbH | Crusher with at least one perforated disc and with at least one of the perforated disc associated knife |
AT524852B1 (en) * | 2021-11-09 | 2022-10-15 | Econ Gmbh | Device for mounting a cutter head of a plant for granulating plastic |
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AT524852B1 (en) | 2022-10-15 |
AT524852A4 (en) | 2022-10-15 |
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