EP0315133A1 - Spinning rotor - Google Patents

Spinning rotor Download PDF

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Publication number
EP0315133A1
EP0315133A1 EP88118225A EP88118225A EP0315133A1 EP 0315133 A1 EP0315133 A1 EP 0315133A1 EP 88118225 A EP88118225 A EP 88118225A EP 88118225 A EP88118225 A EP 88118225A EP 0315133 A1 EP0315133 A1 EP 0315133A1
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EP
European Patent Office
Prior art keywords
blind hole
shaft
spinning rotor
spinning
rotor according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP88118225A
Other languages
German (de)
French (fr)
Inventor
Mojmir Rndr Ing. Kladensky
Martin Dipl.-Ing. Pirko
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Elitex Zavody Textilniho
Elitex Koncern Textilniho Strojirenstvi
Original Assignee
Elitex Zavody Textilniho
Elitex Koncern Textilniho Strojirenstvi
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Elitex Zavody Textilniho, Elitex Koncern Textilniho Strojirenstvi filed Critical Elitex Zavody Textilniho
Publication of EP0315133A1 publication Critical patent/EP0315133A1/en
Withdrawn legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H4/00—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques
    • D01H4/04—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques imparting twist by contact of fibres with a running surface
    • D01H4/08—Rotor spinning, i.e. the running surface being provided by a rotor
    • D01H4/10—Rotors

Definitions

  • the invention relates to a spinning rotor for open-end spinning machines.
  • the spinning rotors which are mounted in roller bearings or in pairs of rolling rollers, reach 90,000 rpm during operation with the usual service life of the bearings.
  • a further increase in the rotor speed is hampered by vibrations, which are associated with the fact that the rotor shafts reach the range of the third critical speeds.
  • Critical speeds are shaft speeds at which the undamped shaft starts to vibrate with subsequent destruction. If the wave z. B. is damped by the use of a bearing bush, which is itself stored in a rubber bushing, or the like, the critical vibration conditions are avoided.
  • the occurring vibrations of the shaft but reduce the service life of the rolling bearings or the contact surface of the rolling rollers and the corresponding parts of the shaft surface. For these reasons, the operating speed of the rotor shaft must be at a safe distance below the critical speed mentioned, even if the rotors are dynamically balanced.
  • the object of the invention is to provide a spinning rotor in which the range of the third critical speeds is adjusted substantially upwards and which can also be operated at increased speeds above 100,000 rpm without impairing the service life of the shaft bearing.
  • the rotor shaft has at least one axial blind hole, at least on the side of its drive part that comes into contact with the drive belt means, the depth of which can be one to ten times the shaft diameter, this axial blind hole possibly having different cross sections have and possibly can also pass into a passage opening provided over the entire length of the shaft, the diameter of which is only small in comparison with that of the axial blind hole.
  • the solution according to the invention which substantially increases the range of the critical speeds, also enables the dynamic balancing of the rotor shaft by removing the material from the inside of the axial blind hole, so that the outer surface of the shaft is in no way impaired.
  • the spinning unit of an open-end spinning machine contains a spinning rotor, which consists of a shaft 1 and a head part 2, in which the spinning process takes place.
  • the free end section of the shaft 1 forms a drive part 3, which for this purpose is usually tangentially touched or partially wrapped with a drive belt 4.
  • the shaft 1 is supported in a multi-row bearing bush 5 sealed at the end, the two sets of balls of which run in annular grooves in the rotor shaft 1.
  • the bearing bush 5 is held in two elastic bushes 6, with which the entire rotor system is fastened in the body 7 of the spinning unit. Between the bearing bush 5 and the bushes 6 there is also a sleeve which extends beyond the bearing bush 5 and surrounds a thickened transition between the shaft 1 and the head 2 with play.
  • the shaft 1 is on the side of its drive part 3 provided with an axial blind hole 8, the depth of which can be one to ten times the shaft diameter.
  • the central blind hole can have different cross sections, namely through shoulders and / or (not shown) through a conical shape, the cone tip being directed towards the head part 2 of the rotor, possibly also having a different curvature.
  • the diameter of the blind hole 8 in the individual sections can be 0.2 to 0.95 of the shaft diameter.
  • a through-going axial bore 9 can be provided in the rotor shaft 1, the diameter of which may be substantially smaller than the diameter of the axial blind hole 8, which is also provided in the shaft 1 in this case is so that the effect pursued by the invention is retained.
  • the function of the axial blind hole 8 consists in relieving in particular the drive part 3 of the rotor shaft 1, the dynamic properties of the rotor shaft 1 being modified in such a way that the lower limit of their critical speeds increases.
  • the axial blind hole 8 can also be used for balancing the shaft 1 by removing material from its wall.
  • the blind hole 8 is partially or completely made of a material with a different specific weight fills in the z. B. can have damping properties against vibrations and prevents the ingress of dust into the blind hole 8 and through the narrow longitudinal bore 9 in the rotor head 2.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)

Abstract

The subject of the invention is a spinning rotor for open-end spinning machines, in which, in order to adjust the lower limit of the critical speed range in the upward direction, there is in the rotor shaft (1), on its drive side, an axial blind hole (8), the depth of which should be once to ten times the shaft diameter. <IMAGE>

Description

Die Erfindung betrifft einen Spinnrotor für Offen-End-­Spinnmaschinen.The invention relates to a spinning rotor for open-end spinning machines.

Die in Wälzlagern oder in Abwälzrollenpaaren gelagerten Spinnrotoren erreichen im Betrieb 90.000 U/min bei üblicher Lebensdauer der Lager. Einer darüber hinausgehenden Erhöhung der Rotordrehzahl stehen Vibrationen im Wege, die damit zusammenhängen, daß die Rotorwellen in den Bereich der dritten kritischen Drehzahlen gelangen. Als kritische Dreh­zahlen sind solche Wellendrehzahlen zu verstehen, bei denen die ungedämpfte Welle ins Schwingen gerät mit nachfolgender Destruktion. Falls die Welle z. B. durch Verwendung einer Lagerbuchse, die selbst in einer Gummibuchse gelagert ist, o. ä. gedämpft ist, werden die kritischen Schwingungszu­stände vermieden. Die auftretenden Schwingungen der Welle verimindern aber die Lebensdauer der Wälzlager oder der Kontaktfläche der Abwälzrollen und der entsprechenden Teile der Wellenoberfläche. Aus diesen Gründen muß die Betriebs­drehzahl der Rotorwelle mit sicherem Abstand unter der genannten kritischen Drehzahl liegen auch wenn die Rotoren dynamisch ausgewuchtet werden.The spinning rotors, which are mounted in roller bearings or in pairs of rolling rollers, reach 90,000 rpm during operation with the usual service life of the bearings. A further increase in the rotor speed is hampered by vibrations, which are associated with the fact that the rotor shafts reach the range of the third critical speeds. Critical speeds are shaft speeds at which the undamped shaft starts to vibrate with subsequent destruction. If the wave z. B. is damped by the use of a bearing bush, which is itself stored in a rubber bushing, or the like, the critical vibration conditions are avoided. The occurring vibrations of the shaft but reduce the service life of the rolling bearings or the contact surface of the rolling rollers and the corresponding parts of the shaft surface. For these reasons, the operating speed of the rotor shaft must be at a safe distance below the critical speed mentioned, even if the rotors are dynamically balanced.

Aufgabe der Erfindung ist es, einen Spinnrotor zu schaffen, bei dem der Bereich der dritten kritischen Drehzsahlen we­sentlich nach oben verstellt ist und der ohne Beeinträchti­gung der Lebensdauer der Wellenlagerung auch bei erhöhten Drehzahlen über 100.000 U/min betrieben werden kann.The object of the invention is to provide a spinning rotor in which the range of the third critical speeds is adjusted substantially upwards and which can also be operated at increased speeds above 100,000 rpm without impairing the service life of the shaft bearing.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Rotorwelle wenigstens auf der Seite ihres Antriebs­teils, der mit dem Antriebsgurtmittel in Berührung kommt, zumindest ein axiales Blindloch aufweist, dessen Tiefe das Ein- bis Zehnfache des Wellendurchmessers betragen kann, wobei dieses axiale Blindloch gegebenenfalls unter­schiedliche Querschnitte haben und eventuell auch in eine in der ganzen Länge der Welle vorgesehene Durchgangsöffnung übergehen kann, deren Durchmesser im Vergleich mit dem des axialen Blindlochs nur klein ist.This object is achieved in that the rotor shaft has at least one axial blind hole, at least on the side of its drive part that comes into contact with the drive belt means, the depth of which can be one to ten times the shaft diameter, this axial blind hole possibly having different cross sections have and possibly can also pass into a passage opening provided over the entire length of the shaft, the diameter of which is only small in comparison with that of the axial blind hole.

Die erfindungsgemäße Lösung, die den Bereich der kriti­schen Drehzahlen wesentlich nach oben verstellt, ermög­licht außerdem, die dynamische Auswuchtung der Rotorwelle durch Abnahme des Materials vom Inneren des axialen Blind­lochs, so daß die äußere Oberfläche der Welle in keiner Weise beeinträchtigt wird.The solution according to the invention, which substantially increases the range of the critical speeds, also enables the dynamic balancing of the rotor shaft by removing the material from the inside of the axial blind hole, so that the outer surface of the shaft is in no way impaired.

Weitere Vorteile und Besonderheiten der Erfindung ergeben sich aus der Zeichnung und der folgenden Beschreibung von Ausführungsbeispielen. Es zeigen:

  • Fig. 1 einen Längsschnitt durch einen Spinnrotor mit einem axialen Blindloch am freien Wellen­ende, und
  • Fig. 2 eine alternative Ausführung des Spinnrotors mit einem abgestuften Blindloch, und einer weiteren möglichen Durchgangsöffnung in der Rotorwelle.
Further advantages and special features of the invention result from the drawing and the following description of exemplary embodiments. Show it:
  • Fig. 1 shows a longitudinal section through a spinning rotor with an axial blind hole at the free shaft end, and
  • Fig. 2 shows an alternative embodiment of the spinning rotor with a stepped blind hole, and another possible through hole in the rotor shaft.

Die Spinneinheit einer Offen-End-Spinnmaschine enthält einen Spinnrotor, der aus einer Welle 1 und aus einem Kopf­teil 2 besteht, in dem der Spinnvorgang abläuft. Der freie Endabschnitt der Welle 1 bildet einen Antriebsteil 3, der zu diesem Zweck üblicherweise mit einem Antriebsgurt 4 in tangentieller Berührung bzw. teilweise umschlungen wird. Im dargestellten Ausführungsbeispiel ist die Welle 1 in einer endseitig abgedichteten Mehrreihen-Lagerbuchse 5 gelagert, deren zwei Kugelsätze in Ringnuten der Rotor­welle 1 laufen. Die Lagerbuchse 5 ist in zwei elastischen Buchsen 6 gehalten, mit denen das ganze Rotorsystem im Körper 7 der Spinneinheit befestigt ist. Zwischen der Lager­buchse 5 und den Buchsen 6 ist noch eine Hülse angeordnet, die über die Lagerbuchse 5 hinausreicht und einen verdickten Übergang zwischen der Welle 1 und dem Kopf 2 mit Spiel umgibt.The spinning unit of an open-end spinning machine contains a spinning rotor, which consists of a shaft 1 and a head part 2, in which the spinning process takes place. The free end section of the shaft 1 forms a drive part 3, which for this purpose is usually tangentially touched or partially wrapped with a drive belt 4. In the exemplary embodiment shown, the shaft 1 is supported in a multi-row bearing bush 5 sealed at the end, the two sets of balls of which run in annular grooves in the rotor shaft 1. The bearing bush 5 is held in two elastic bushes 6, with which the entire rotor system is fastened in the body 7 of the spinning unit. Between the bearing bush 5 and the bushes 6 there is also a sleeve which extends beyond the bearing bush 5 and surrounds a thickened transition between the shaft 1 and the head 2 with play.

Um den Bereich der kritischen Drehzahlen nach oben zu ver­stellen, ist die Welle 1 auf der Seite ihres Antriebsteils 3 mit einem axialen Blindloch 8 versehen, dessen Tiefe das Ein- bis Zehnfache des Wellendurchmessers betragen kann.In order to adjust the range of the critical speeds upwards, the shaft 1 is on the side of its drive part 3 provided with an axial blind hole 8, the depth of which can be one to ten times the shaft diameter.

Wie aus Fig. 2 ersichtlich, kann das zentrale Blindloch unterschiedliche Querschnitte aufweisen, und zwar durch Absätze und/oder (nicht dargestellt) durch konische Form, wobei die Kegelspitze zum Kopfteil 2 des Rotors gerichtet ist, eventuell auch anders gekrümmt. Der Durchmesser des Blindlochs 8 in den einzelnen Sektionen kann 0,2 bis 0,95 des Wellendurchmessers betragen.As can be seen from FIG. 2, the central blind hole can have different cross sections, namely through shoulders and / or (not shown) through a conical shape, the cone tip being directed towards the head part 2 of the rotor, possibly also having a different curvature. The diameter of the blind hole 8 in the individual sections can be 0.2 to 0.95 of the shaft diameter.

In Sonderfällen, die mit der Konstruktion des Rotors der Spinneinheit zusammenhängen, kann in der Rotorwelle 1 eine durchgehende Axialbohrung 9 vorgesehen werden, deren Durch­messer gegebenenfalls wesentlich kleiner als der Durch­messer fes axialen Blindlochs 8 sein kann, das auch in diesem Fall in der Welle 1 vorgesehen ist, damit der durch die Erfindung verfolgte Effekt beibehalten bleibt.In special cases, which are related to the construction of the rotor of the spinning unit, a through-going axial bore 9 can be provided in the rotor shaft 1, the diameter of which may be substantially smaller than the diameter of the axial blind hole 8, which is also provided in the shaft 1 in this case is so that the effect pursued by the invention is retained.

Die Funktion des axialen Blindlochs 8 besteht in der Ent­lastung insbesondere des Antriebsteils 3 der Rotorwelle 1, wobei die dynamischen Eigenschaften der Rotorwelle 1 so modifiziert werden, daß sich die untere Grenze ihrer kritischen Drehzsahlen erhöht. Das axiale Blindloch 8 kann auch zum Auswuchten der Welle 1 ausgenutzt werden, indem von seiner Wandung Material abgenommen wird.The function of the axial blind hole 8 consists in relieving in particular the drive part 3 of the rotor shaft 1, the dynamic properties of the rotor shaft 1 being modified in such a way that the lower limit of their critical speeds increases. The axial blind hole 8 can also be used for balancing the shaft 1 by removing material from its wall.

Weitere zweckmäßige Möglichkeiten, die der Spinnrotor mit der Welle 1 mit dem axialen Blindloch 8 bietet, bestehen darin, daß man das Blindloch 8 mit einem Material von anderem spezifischem Gewicht teilweise oder vollständig ausfüllt, das z. B. Dämpfungseigenschaften gegen Vibrationen haben kann und das Eindringen von Staub in das Blindloch 8 und über die schmale Längsbohrung 9 in den Rotorkopf 2 verhindert.Further expedient possibilities offered by the spinning rotor with the shaft 1 with the axial blind hole 8 are that the blind hole 8 is partially or completely made of a material with a different specific weight fills in the z. B. can have damping properties against vibrations and prevents the ingress of dust into the blind hole 8 and through the narrow longitudinal bore 9 in the rotor head 2.

Claims (8)

1. Spinnrotor für Offen-End-Spinnmaschinen, dessen Welle an einem Ende mit einem Kopfteil verbunden ist und am anderen freien Ende einen von einem Antriebsgurt tan­gential kontaktierten Antriebsteil aufweist, dadurch gekennzeichnet, daß die Welle (1) wenigstens auf der Seite ihres An­triebsteils (3) mit einem axialen Blindloch (8) ver­sehen ist.1. Spinning rotor for open-end spinning machines, the shaft of which is connected at one end to a head part and at the other free end has a drive part tangentially contacted by a drive belt, characterized in that the shaft (1) at least on the side of its drive part ( 3) is provided with an axial blind hole (8). 2. Spinnrotor nach Anspruch 1, dadurch gekennzeichnet, daß die Tiefe des zentralen Blindlochs (8) das Ein­bis Zehnfache des Durchmessers der Rotorwelle (1) be­träght.2. Spinning rotor according to claim 1, characterized in that the depth of the central blind hole (8) is one to ten times the diameter of the rotor shaft (1). 3. Spinnrotor nach Anspruch 1 und 2, dadurch gekennzeichnet, daß das Blindloch (8) unterschiedliche Querschnitte aufweist.3. Spinning rotor according to claim 1 and 2, characterized in that the blind hole (8) has different cross sections. 4. Spinnrotor nach Anspruch 1 bis 3, dadurch gekennzeichnet, daß das Blindloch (8) Durchmesser von etwa 0,2 bis 0,95 des Wellendurchmessers hat.4. Spinning rotor according to claim 1 to 3, characterized in that the blind hole (8) has a diameter of about 0.2 to 0.95 of the shaft diameter. 5. Spinnrotor nach Anspruch 1 bis 4, dadurch gekennzeichnet, daß das Blindloch (8) kegelig ist, wobei das schmale Kegelende dem Rotorkopf zugewandt ist.5. Spinning rotor according to claim 1 to 4, characterized in that the blind hole (8) is conical, the narrow cone end facing the rotor head. 6. Spinnrotor nach Anspruch 1 bis 5, dadurch gekennzeichnet, daß das Blindloch (8) stufenweise ausgebildet ist.6. Spinning rotor according to claim 1 to 5, characterized in that the blind hole (8) is formed in stages. 7. Spinnrotor nach Anspruch 1 bis 6, dadurch gekennzeichnet, daß das Blindloch (8) in eine durchlaufende, sich in der ganzen Länge der Welle (1) erstreckende Bohrung (9) übergeht.7. Spinning rotor according to claim 1 to 6, characterized in that the blind hole (8) in a continuous, in the entire length of the shaft (1) extending bore (9). 8. Spinnrotor nach Anspruch 1 bis 7, dadurch gekennzeichnet, daß das axiale Blindloch (8) mit einer Materie von z. B. unterschiedlichem spezifischem Gewicht und/oder besonde­ren Dampfungseigenschaften zumindest teilweise ausgefüllt ist.8. Spinning rotor according to claim 1 to 7, characterized in that the axial blind hole (8) with a matter of z. B. different specific weight and / or special damping properties is at least partially filled.
EP88118225A 1987-11-04 1988-11-02 Spinning rotor Withdrawn EP0315133A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CS7891/87 1987-11-04
CS877891A CS265584B1 (en) 1987-11-04 1987-11-04 Rotor for spinning of a open-end spinning machine

Publications (1)

Publication Number Publication Date
EP0315133A1 true EP0315133A1 (en) 1989-05-10

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP88118225A Withdrawn EP0315133A1 (en) 1987-11-04 1988-11-02 Spinning rotor

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EP (1) EP0315133A1 (en)
CS (1) CS265584B1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4009374A1 (en) * 1990-03-23 1991-09-26 Schlafhorst & Co W Open=end spinning rotor shaft - has axial elasticity at the free end towards the step bearing to dampen oscillation
CN113486560A (en) * 2021-07-20 2021-10-08 中国科学院工程热物理研究所 Dynamic design method for central pull rod rotor-supporting system of engine

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1200264A (en) * 1968-04-19 1970-07-29 Vnii Legkogo 1 Textilnogo Mash A twisting and forming device for break spinning
FR2202961A1 (en) * 1972-10-13 1974-05-10 Alsacienne Constr Meca Open end spinning device having spinning cup - to which fibres are fed through an annular channel defined by a centre body mounted in a duct
DE2405499A1 (en) * 1973-02-05 1974-08-15 Daiwa Spinning Co Ltd BRAKE DEVICE FOR THE SPINNING TURBINE OF AN OPEN-END SPINNING UNIT
FR2348394A1 (en) * 1976-04-13 1977-11-10 Heidenhain Gmbh Dr Johannes AIR CUSHION BEARING FOR HIGH-SPEED ROTATING PARTS
DE2748389A1 (en) * 1977-10-28 1979-05-03 Skf Kugellagerfabriken Gmbh Open=end spinning rotor shaft - has lubricating grease held in hollow shaft by end caps to pass through channels to the bearings
DE3417705A1 (en) * 1983-04-16 1985-11-14 Fritz 7347 Bad Überkingen Stahlecker Open-end rotor spinning machine having a plurality of spinning units

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1200264A (en) * 1968-04-19 1970-07-29 Vnii Legkogo 1 Textilnogo Mash A twisting and forming device for break spinning
FR2202961A1 (en) * 1972-10-13 1974-05-10 Alsacienne Constr Meca Open end spinning device having spinning cup - to which fibres are fed through an annular channel defined by a centre body mounted in a duct
DE2405499A1 (en) * 1973-02-05 1974-08-15 Daiwa Spinning Co Ltd BRAKE DEVICE FOR THE SPINNING TURBINE OF AN OPEN-END SPINNING UNIT
FR2348394A1 (en) * 1976-04-13 1977-11-10 Heidenhain Gmbh Dr Johannes AIR CUSHION BEARING FOR HIGH-SPEED ROTATING PARTS
DE2748389A1 (en) * 1977-10-28 1979-05-03 Skf Kugellagerfabriken Gmbh Open=end spinning rotor shaft - has lubricating grease held in hollow shaft by end caps to pass through channels to the bearings
DE3417705A1 (en) * 1983-04-16 1985-11-14 Fritz 7347 Bad Überkingen Stahlecker Open-end rotor spinning machine having a plurality of spinning units

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 8, no. 178 (C-238) 161 16 August 1984, & JP-A-59 076560 (TOSHIBA K.K.) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4009374A1 (en) * 1990-03-23 1991-09-26 Schlafhorst & Co W Open=end spinning rotor shaft - has axial elasticity at the free end towards the step bearing to dampen oscillation
CN113486560A (en) * 2021-07-20 2021-10-08 中国科学院工程热物理研究所 Dynamic design method for central pull rod rotor-supporting system of engine
CN113486560B (en) * 2021-07-20 2022-07-26 中国科学院工程热物理研究所 Dynamic design method for engine center pull rod rotor-supporting system

Also Published As

Publication number Publication date
CS265584B1 (en) 1989-10-13
CS789187A1 (en) 1989-02-10

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