EP1780324A1 - Apparatus for needling a nonwoven material - Google Patents

Apparatus for needling a nonwoven material Download PDF

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Publication number
EP1780324A1
EP1780324A1 EP20060450146 EP06450146A EP1780324A1 EP 1780324 A1 EP1780324 A1 EP 1780324A1 EP 20060450146 EP20060450146 EP 20060450146 EP 06450146 A EP06450146 A EP 06450146A EP 1780324 A1 EP1780324 A1 EP 1780324A1
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EP
European Patent Office
Prior art keywords
drive
piston
working cylinder
cylinder
resonance
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Granted
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EP20060450146
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German (de)
French (fr)
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EP1780324B1 (en
Inventor
Gudrun Dr. Mikota
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Autefa Solutions Austria GmbH
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Neumag Saurer Austria GmbH
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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H18/00—Needling machines
    • D04H18/02—Needling machines with needles

Definitions

  • the invention relates to a device for needling a nonwoven fabric having at least one needle board connected to bumpers guided in the piercing direction and at least one drive for the needle board engaging the bumpers.
  • the needle board equipped with corresponding needles must be driven back and forth in the direction of the puncture with respect to the fleece, which is conveyed longitudinally between a stitch backing and the needle board.
  • the needle board which is usually detachably held in a needle bar, is guided by means of two bumpers acting on the needle bar, to which the connecting rods of an eccentric drive are articulated.
  • the invention is therefore based on the object, a device for needling a nonwoven fabric of the type described in such a way that with relatively simple design means and higher puncture frequencies can be ensured.
  • the invention solves the problem set by the fact that the drive is designed as a hydrostatic resonance drive, which acted upon at least one working cylinder with a hydraulic spring on both sides Piston and means for pressurizing the piston at a frequency corresponding to the resonant frequency of the resulting from the moving masses and the hydraulic springs vibration system.
  • the drive Due to the design of the drive as a hydrostatic resonance drive, the conversion of a rotational movement into a reciprocating linear movement via an eccentric drive is initially avoided by the use of at least one working cylinder.
  • the desired high puncture frequencies are achieved with a comparatively small expenditure of energy by the provision of a vibration system comprising two counteracting hydraulic springs and is excited in the resonance region, so that a piston acted upon by the two hydraulic springs is displaced at the resonant frequency of this vibration system in a working cylinder , Since the resonant frequency is determined by the resulting stiffness of the two hydraulic springs on the one hand and the oscillating mass on the other hand and the spring stiffness depends on the effective piston area and the hydraulic capacity, which in turn results from the volume and modulus of elasticity of the hydraulic medium, both the effective Piston area and the required spring volume for a given resonant frequency, a predetermined oscillation amplitude and an allowable pressure amplitude can be determined from the known physical relationships.
  • the needle board Despite the puncturing direction predetermined by the cylinder (s), it is possible to give the needle board an additional reciprocating movement in the non-woven direction, in order to act on the movement component during the needle penetration in non-woven direction of the needle board to increase the conveying speed for the fleece.
  • the needle board with the hydrostatic resonance drive to form a rotatably mounted transversely to the nonwoven passage assembly, on which acts on a hydrostatic resonance drive synchronous vibration drive.
  • This vibration drive can consist of a Exzentertrieb in a conventional manner.
  • Advantageous design conditions arise, however, if the vibration drive for a Nadelbrettschi in nonwoven conveyor direction is also designed as a hydrostatic resonance drive with a working cylinder and a piston acted upon by both sides of hydraulic springs.
  • the hydraulic springs can be used in housings which are connected via corresponding pressure lines to the pressure chambers of the working cylinder.
  • simpler construction conditions arise when the working cylinder is designed to be open at least on one end side and protrudes with the open end side into the housing of the associated hydraulic spring, so that separate pressure lines between the working cylinder and the housing of the hydraulic spring omitted.
  • the drive can have an equiaxial compensating cylinder in addition to the working cylinder, wherein the working cylinder and the compensating cylinder are hydraulically connected to each other on the same side of the piston and connected on the opposite side to a respective hydraulic spring.
  • an opposite to the working cylinder piston movement of the compensating cylinder is ensured on the compensating cylinder, so that with a corresponding assignment of a balancing mass to the piston of the compensating cylinder, a mass balance is achieved, also under resonance conditions for the balancing mass.
  • the natural frequency is dependent on the volume of the hydraulic springs with otherwise constant parameters.
  • the spring volume can thus also influence the natural frequency.
  • the volume of the housing be made adjustable at least for one of the two hydraulic springs of the working cylinder, for example by means of an actuating cylinder.
  • a hydrostatic resonance drive has a piston 2 guided in a working cylinder 1 with a piston rod 3, which is acted upon on both sides by a respective hydraulic spring 4 and 5.
  • These hydraulic springs 4 and 5 comprise a filled with a hydraulic medium housing 6, which must be designed to be stiff in order to accommodate the pressure amplitudes can.
  • the working cylinder 1 is open on both faces and opens with the open end faces in the housing 6 for the two hydraulic springs 4, 5, so that the piston 2 can be acted upon directly by the hydraulic springs 4 and 5.
  • two control valves 7, 8 are connected to the two hydraulic springs 4 and 5, thus depending on the slide position of the control valves 7, 8 can be connected either with an acted upon by a pump 9 pressure line 10 or with a return line 11 for the hydraulic fluid. If, for example, the piston 2 is excited via the control valve 7 with a frequency to oscillations, the resonant frequency of the moving masses and the two corresponds to hydraulic springs 4 and 5 formed vibration system, it can be ensured via the piston rod 3 in an advantageous manner, a vibration drive, which not only brings a comparatively simple structure with it, but can also be operated energy-saving.
  • the two control valves 7, 8 also allow adjustment of the central position of the piston. 2
  • the resonant frequency of the vibration system can be adjusted by changing the resulting spring stiffness.
  • the volume of the housing 6 for at least one of the two hydraulic springs 4, 5 are adjusted. In the embodiment of FIG. 1, this is provided for the hydraulic spring 5, with the aid of a piston 12 which is displaced by a control cylinder 13.
  • the actuating piston 14 is acted upon via a control valve 15 and held in the selected piston position.
  • an equiaxial compensating cylinder 16 are provided which is hydraulically coupled to the working cylinder 1 via a line connection 17 on the same side of the piston, so that the Piston 18 of the compensating cylinder 16 is displaced in opposite directions to the piston 2 of the working cylinder 1, which provides for a corresponding mass balance for a substantial mass balance.
  • the hydraulic springs 4 and 5 act in this case, on the one hand, the working cylinder 1 and on the other hand, the compensating cylinder 16th
  • the center position of the pistons 2, 18 of the working cylinder 1 and the compensating cylinder 16 can be adjusted independently of each other with respect to their central position, another control valve 20 is provided.
  • the adjustment of the resonant frequency is carried out according to the measures taken for the working cylinder 1 by a piston 12 which is equipped with a control piston 14 is connected in a control cylinder 13 and is controlled by a control valve 15.
  • a needle board 21 is shown in a view in non-woven direction, which is releasably attached to a needle bar 22 in a conventional manner.
  • To drive the needle board 21 in the piercing direction of the needles 23 of the needle bar 22 is connected to parallel bumpers 24, each forming a piston rod 3 of a hydrostatic resonance drive, as shown in more detail in FIG.
  • the pistons 18 of the compensating cylinder 16 form the balancing mass 19.
  • the needle board 21 is thus driven by the engaging on the two bumpers 24 hydrostatic resonance drive with a resonant frequency of this drive corresponding puncture frequency. It only needs to be taken care of a synchronization of the two cylinders, which can be done hydraulically, mechanically or control technology.
  • FIG. 4 which shows a needle board 21 in a side view
  • the resonance drive is combined with the piston rods 3 to form a structural unit 25, which is mounted so as to be pivotable in a frame about an axis 27 extending transversely to the nonwoven passage direction 26. Because of this pivotable mounting of the assembly 25, the needle board 21 can be moved back and forth in nonwoven web direction 26, as indicated by the arrows 28.
  • the pivot drive 29 for this additional movement of the needle board 21 may be designed differently and consist of a Exzentertrieb in a conventional manner. However, particularly favorable drive conditions arise when the pivot drive 29 is likewise formed from a hydrostatic resonance drive, as shown in FIGS and FIG. 2 is shown.
  • the structural unit formed by the resonance drive is again pivotable about an axis fixed to the frame 30, in order to be able to articulate the piston rod 3 directly to the structural unit 25 without intermediate linkage, as shown in FIG.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Nonwoven Fabrics (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)

Abstract

Apparatus for needling nonwovens, comprising a needle board connected to push rods, comprises a push rod drive in the form of a hydrostatic resonance drive comprising pistons (2) acted upon on both sides by hydraulic springs (4, 5) and a device for applying pressure to the pistons at a frequency corresponding to the resonance frequency of the vibrational system comprising the moving masses and the hydraulic springs.

Description

Die Erfindung bezieht sich auf eine Vorrichtung zum Nadeln eines Vlieses mit wenigstens einem Nadelbrett, das mit in Einstichrichtung geführten Stoßstangen verbunden ist, und mit wenigstens einem an den Stoßstangen angreifenden Antrieb für das Nadelbrett.The invention relates to a device for needling a nonwoven fabric having at least one needle board connected to bumpers guided in the piercing direction and at least one drive for the needle board engaging the bumpers.

Zum Nadeln eines Vlieses muß das mit entsprechenden Nadeln bestückte Nadelbrett in Einstichrichtung gegenüber dem Vlies hin- und hergehend angetrieben werden, das zwischen einer Stichunterlage und dem Nadelbrett in Längsrichtung gefördert wird. Das üblicherweise in einem Nadelbalken lösbar gehaltene Nadelbrett wird mit Hilfe zweier am Nadelbalken angreifender Stoßstangen geführt, an denen die Pleuel eines Exzentertriebes angelenkt sind. Abgesehen davon, daß diesen Exzentertrieben naturgemäß jene Nachteile anhaften, die mit der Umsetzung einer Drehbewegung in eine geradlinige Einstichbewegung verbunden sind, ergeben sich mit den bekannten Exzenterantrieben zunehmende Schwierigkeiten, wenn es gilt, die Einstichfrequenz für die Nadelbretter zu steigern.To need a fleece, the needle board equipped with corresponding needles must be driven back and forth in the direction of the puncture with respect to the fleece, which is conveyed longitudinally between a stitch backing and the needle board. The needle board, which is usually detachably held in a needle bar, is guided by means of two bumpers acting on the needle bar, to which the connecting rods of an eccentric drive are articulated. Apart from the fact that these eccentric inherently adhere to those disadvantages associated with the implementation of a rotary motion in a straight-line puncturing, arise with the known eccentric drives increasing difficulties when it comes to increase the puncture frequency for the needle boards.

Der Erfindung liegt somit die Aufgabe zugrunde, eine Vorrichtung zum Nadeln eines Vlieses der eingangs geschilderten Art so auszugestalten, daß mit vergleichsweise einfachen konstruktiven Mitteln auch höhere Einstichfrequenzen sichergestellt werden können.The invention is therefore based on the object, a device for needling a nonwoven fabric of the type described in such a way that with relatively simple design means and higher puncture frequencies can be ensured.

Die Erfindung löst die gestellte Aufgabe dadurch, daß der Antrieb als hydrostatischer Resonanzantrieb ausgebildet ist, der wenigstens einen Arbeitszylinder mit einem beidseitig über je eine hydraulische Feder beaufschlagten Kolben sowie eine Einrichtung zur Druckbeaufschlagung des Kolbens mit einer Frequenz umfaßt, die der Resonanzfrequenz des sich aus den bewegten Massen und den hydraulischen Federn ergebenden Schwingungssystems entspricht.The invention solves the problem set by the fact that the drive is designed as a hydrostatic resonance drive, which acted upon at least one working cylinder with a hydraulic spring on both sides Piston and means for pressurizing the piston at a frequency corresponding to the resonant frequency of the resulting from the moving masses and the hydraulic springs vibration system.

Durch die Ausbildung des Antriebes als hydrostatischer Resonanzantrieb wird zunächst die Umwandlung einer Drehbewegung in eine hin- und hergehende Linearbewegung über einen Exzentertrieb durch den Einsatz wenigstens eines Arbeitszylinders vermieden. Die angestrebten hohen Einstichfrequenzen werden mit einem vergleichsweise geringen Energieaufwand durch das Vorsehen eines Schwingungssystems erzielt, das zwei gegensinnig wirksame hydraulische Federn umfaßt und im Resonanzbereich angeregt wird, so daß ein über die beiden hydraulischen Federn beaufschlagter Kolben mit der Resonanzfrequenz dieses Schwingungssystems in einem Arbeitszylinder verlagert wird. Da die Resonanzfrequenz durch die resultierende Steifigkeit der beiden hydraulischen Federn einerseits und durch die schwingende Masse anderseits bestimmt wird und die Federsteifigkeit von der wirksamen Kolbenfläche und der hydraulischen Kapazität abhängt, die sich wiederum aus dem Volumen und dem Elastizitätsmodul des Hydraulikmittels ergibt, kann sowohl die wirksame Kolbenfläche als auch das erforderliche Federvolumen für eine vorgegebene Resonanzfrequenz, eine vorgegebene Schwingungsamplitude sowie eine zulässige Druckamplitude aus den bekannten physikalischen Zusammenhängen ermittelt werden.Due to the design of the drive as a hydrostatic resonance drive, the conversion of a rotational movement into a reciprocating linear movement via an eccentric drive is initially avoided by the use of at least one working cylinder. The desired high puncture frequencies are achieved with a comparatively small expenditure of energy by the provision of a vibration system comprising two counteracting hydraulic springs and is excited in the resonance region, so that a piston acted upon by the two hydraulic springs is displaced at the resonant frequency of this vibration system in a working cylinder , Since the resonant frequency is determined by the resulting stiffness of the two hydraulic springs on the one hand and the oscillating mass on the other hand and the spring stiffness depends on the effective piston area and the hydraulic capacity, which in turn results from the volume and modulus of elasticity of the hydraulic medium, both the effective Piston area and the required spring volume for a given resonant frequency, a predetermined oscillation amplitude and an allowable pressure amplitude can be determined from the known physical relationships.

Wegen des Fehlens von Exzenterantrieben entfallen antriebsbedingte Querkräfte, was zu einfachen Konstruktionsbedingungen führt, insbesondere dann, wenn wenigstens zwei Arbeitszylinder vorgesehen werden, deren mit den Kolben verbundene Kolbenstangen als Stoßstangen ausgebildet sind.Due to the lack of eccentric drives eliminates drive-related lateral forces, which leads to simple design conditions, especially if at least two working cylinders are provided whose piston rods connected to the piston are formed as bumpers.

Trotz der durch den bzw. die Arbeitszylinder vorgegebenen Einstichrichtung ist es möglich, dem Nadelbrett eine zusätzliche hin- und hergehende Bewegung in Vliesdurchlaufrichtung zu erteilen, um aufgrund der während des Nadeleinstiches in Vliesdurchlaufrichtung wirksamen Bewegungskomponente des Nadelbrettes die Fördergeschwindigkeit für das Vlies zu vergrößern. Zu diesem Zweck braucht ja lediglich das Nadelbrett mit dem hydrostatischen Resonanzantrieb eine um eine quer zur Vliesdurchlaufrichtung drehbar gelagerte Baueinheit zu bilden, an der ein zum hydrostatischen Resonanzantrieb synchroner Schwingungsantrieb angreift. Dieser Schwingungsantrieb kann in herkömmlicher Weise aus einem Exzentertrieb bestehen. Vorteilhafte Konstruktionsbedingungen ergeben sich allerdings, wenn der Schwingungsantrieb für eine Nadelbrettbewegung in Vliesdurchlaufrichtung ebenfalls als hydrostatischer Resonanzantrieb mit einem Arbeitszylinder und einem beidseits von hydraulischen Federn beaufschlagten Kolben ausgebildet ist.Despite the puncturing direction predetermined by the cylinder (s), it is possible to give the needle board an additional reciprocating movement in the non-woven direction, in order to act on the movement component during the needle penetration in non-woven direction of the needle board to increase the conveying speed for the fleece. For this purpose, yes only need the needle board with the hydrostatic resonance drive to form a rotatably mounted transversely to the nonwoven passage assembly, on which acts on a hydrostatic resonance drive synchronous vibration drive. This vibration drive can consist of a Exzentertrieb in a conventional manner. Advantageous design conditions arise, however, if the vibration drive for a Nadelbrettbewegung in nonwoven conveyor direction is also designed as a hydrostatic resonance drive with a working cylinder and a piston acted upon by both sides of hydraulic springs.

Die hydraulischen Federn können in Gehäusen untergebraucht werden, die über entsprechende Druckleitungen an die Druckräume des Arbeitszylinders angeschlossen sind. Einfachere Konstruktionsverhältnisse ergeben sich jedoch, wenn der Arbeitszylinder zumindest auf einer Stirnseite offen ausgebildet ist und mit der offenen Stirnseite in das Gehäuse der zugehörigen hydraulischen Feder ragt, so daß gesonderte Druckleitungen zwischen dem Arbeitszylinder und dem Gehäuse der hydraulischen Feder entfallen.The hydraulic springs can be used in housings which are connected via corresponding pressure lines to the pressure chambers of the working cylinder. However, simpler construction conditions arise when the working cylinder is designed to be open at least on one end side and protrudes with the open end side into the housing of the associated hydraulic spring, so that separate pressure lines between the working cylinder and the housing of the hydraulic spring omitted.

Zum Massenausgleich kann der Antrieb neben dem Arbeitszylinder einen gleichachsigen Ausgleichszylinder aufweisen, wobei der Arbeitszylinder und der Ausgleichszylinder auf der gleichen Kolbenseite miteinander hydraulisch verbunden und auf der gegenüberliegenden Seite an je einer hydraulischen Feder angeschlossen sind. Damit wird über den Ausgleichszylinder eine zum Arbeitszylinder gegenläufige Kolbenbewegung des Ausgleichszylinders sichergestellt, so daß bei einer entsprechenden Zuordnung einer Ausgleichsmasse zum Kolben des Ausgleichszylinders ein Massenausgleich erzielt wird, und zwar ebenfalls unter Resonanzbedingungen für die Ausgleichsmasse.For mass balance, the drive can have an equiaxial compensating cylinder in addition to the working cylinder, wherein the working cylinder and the compensating cylinder are hydraulically connected to each other on the same side of the piston and connected on the opposite side to a respective hydraulic spring. Thus, an opposite to the working cylinder piston movement of the compensating cylinder is ensured on the compensating cylinder, so that with a corresponding assignment of a balancing mass to the piston of the compensating cylinder, a mass balance is achieved, also under resonance conditions for the balancing mass.

Wie bereits ausgeführt wurde, hängt die Eigenfrequenz bei sonst gleichbleibenden Parametern vom Volumen der hydraulischen Federn ab. Über das Federvolumen kann somit auch Einfluß auf die Eigenfrequenz genommen werden. Zur Verstellung der Eigenfrequenz kann folglich das Volumen des Gehäuses zumindest für eine der beiden hydraulischen Federn des Arbeitszylinders einstellbar ausgeführt werden, z.B. mit Hilfe eines Stellzylinders.As already stated, the natural frequency is dependent on the volume of the hydraulic springs with otherwise constant parameters. The spring volume can thus also influence the natural frequency. For adjusting the natural frequency, consequently, the volume of the housing be made adjustable at least for one of the two hydraulic springs of the working cylinder, for example by means of an actuating cylinder.

In der Zeichnung ist der Erfindungsgegenstand beispielsweise dargestellt. Es zeigen

Fig. 1
einen Antrieb für eine erfindungsgemäße Vorrichtung zum Nadeln eines Vlieses in einem vereinfachten Blockschaltbild,
Fig. 2
den um einen Massenausgleich ergänzten Antrieb nach der Fig. 1,
Fig. 3
ein mit Hilfe eines hydrostatischen Resonanzantriebes gemäß der Fig. 2 angetriebenes Nadelbrett in einer zum Teil geschnittenen, schematischen Ansicht in Vliesdurchlaufrichtung und
Fig. 4
ein Nadelbrett, das mit Hilfe von hydrostatischen Resonanzantrieben sowohl in Einstichrichtung als auch in Vliesdurchlaufrichtung angetrieben wird, in einer schematischen Seitenansicht.
In the drawing, the subject invention is shown, for example. Show it
Fig. 1
a drive for a device according to the invention for needling a fleece in a simplified block diagram,
Fig. 2
the complemented to a mass balance drive of FIG. 1,
Fig. 3
a driven by means of a hydrostatic resonance drive according to FIG. 2 needle board in a partially sectioned, schematic view in non-woven direction and
Fig. 4
a needle board, which is driven by means of hydrostatic resonance drives both in the puncture direction and in non-woven direction, in a schematic side view.

Wie der Fig. 1 entnommen werden kann, weist ein hydrostatischer Resonanzantrieb einen in einem Arbeitszylinder 1 geführten Kolben 2 mit einer Kolbenstange 3 auf, der beidseits über je eine hydraulische Feder 4 und 5 beaufschlagt wird. Diese hydraulischen Federn 4 und 5 umfassen ein mit einem Hydraulikmittel gefülltes Gehäuse 6, das entsprechend steif ausgebildet sein muß, um die Druckamplituden aufnehmen zu können. Um raumsparende Konstruktionsverhältnisse zu schaffen, ist der Arbeitszylinder 1 auf beiden Stirnseiten offen und mündet mit den offenen Stirnseiten im Gehäuse 6 für die beiden hydraulischen Federn 4, 5, so daß der Kolben 2 von den hydraulischen Federn 4 und 5 unmittelbar beaufschlagt werden kann. Um einerseits den Vorspanndruck der beiden hydraulischen Federn 4, 5 einstellen und anderseits den Kolben 2 zu Schwingungen anregen zu können, sind zwei Steuerventile 7, 8 an die beiden hydraulischen Federn 4 und 5 angeschlossen, die somit in Abhängigkeit von der Schieberstellung der Steuerventile 7, 8 entweder mit einer von einer Pumpe 9 beaufschlagten Druckleitung 10 oder mit einer Rückleitung 11 für das Hydraulikmittel verbunden werden können. Wird beispielsweise der Kolben 2 über das Steuerventil 7 mit einer Frequenz zu Schwingungen angeregt, die der Resonanzfrequenz des aus den bewegten Massen und den beiden hydraulischen Federn 4 und 5 gebildeten Schwingungssystems entspricht, so kann über die Kolbenstange 3 in vorteilhafter Weise ein Schwingungsantrieb sichergestellt werden, der nicht nur einen vergleichsweise einfachen Aufbau mit sich bringt, sondern auch energiesparend betrieben werden kann. Die beiden Steuerventile 7, 8 erlauben außerdem eine Einstellung der Mittellage des Kolbens 2.As can be seen from FIG. 1, a hydrostatic resonance drive has a piston 2 guided in a working cylinder 1 with a piston rod 3, which is acted upon on both sides by a respective hydraulic spring 4 and 5. These hydraulic springs 4 and 5 comprise a filled with a hydraulic medium housing 6, which must be designed to be stiff in order to accommodate the pressure amplitudes can. To create space-saving design conditions, the working cylinder 1 is open on both faces and opens with the open end faces in the housing 6 for the two hydraulic springs 4, 5, so that the piston 2 can be acted upon directly by the hydraulic springs 4 and 5. On the one hand to adjust the biasing pressure of the two hydraulic springs 4, 5 and on the other hand to be able to excite the piston 2 to oscillate, two control valves 7, 8 are connected to the two hydraulic springs 4 and 5, thus depending on the slide position of the control valves 7, 8 can be connected either with an acted upon by a pump 9 pressure line 10 or with a return line 11 for the hydraulic fluid. If, for example, the piston 2 is excited via the control valve 7 with a frequency to oscillations, the resonant frequency of the moving masses and the two corresponds to hydraulic springs 4 and 5 formed vibration system, it can be ensured via the piston rod 3 in an advantageous manner, a vibration drive, which not only brings a comparatively simple structure with it, but can also be operated energy-saving. The two control valves 7, 8 also allow adjustment of the central position of the piston. 2

Die Resonanzfrequenz des Schwingungssystems kann durch eine Änderung der resultierenden Federsteifigkeit eingestellt werden. Zu diesem Zweck kann das Volumen des Gehäuses 6 für zumindest eine der beiden hydraulischen Federn 4, 5 verstellt werden. Im Ausführungsbeispiel nach der Fig. 1 ist dies für die hydraulische Feder 5 vorgesehen, und zwar mit Hilfe eines Kolbens 12, der durch einen Stellzylinder 13 verlagert wird. Der Stellkolben 14 wird über ein Stellventil 15 beaufschlagt und in der jeweils gewählten Kolbenlage festgehalten.The resonant frequency of the vibration system can be adjusted by changing the resulting spring stiffness. For this purpose, the volume of the housing 6 for at least one of the two hydraulic springs 4, 5 are adjusted. In the embodiment of FIG. 1, this is provided for the hydraulic spring 5, with the aid of a piston 12 which is displaced by a control cylinder 13. The actuating piston 14 is acted upon via a control valve 15 and held in the selected piston position.

Um in vergleichsweise einfacher Weise einen Massenausgleich für den Schwingungsantrieb zu schaffen, kann gemäß der Fig. 2 neben dem Arbeitszylinder 6 ein gleichachsiger Ausgleichszylinder 16 vorgesehen werden, der mit dem Arbeitszylinder 1 über eine Leitungsverbindung 17 auf der gleichen Kolbenseite hydraulisch gekoppelt ist, so daß der Kolben 18 des Ausgleichszylinders 16 gegensinnig zum Kolben 2 des Arbeitszylinders 1 verlagert wird, was bei einer entsprechenden Massenabstimmung für einen weitgehenden Massenausgleich sorgt. Die hydraulischen Federn 4 und 5 beaufschlagen in diesem Fall einerseits den Arbeitszylinder 1 und anderseits den Ausgleichszylinder 16.In order to provide a mass balance for the vibration drive in a comparatively simple manner, as shown in FIG. 2 next to the working cylinder 6 an equiaxial compensating cylinder 16 are provided which is hydraulically coupled to the working cylinder 1 via a line connection 17 on the same side of the piston, so that the Piston 18 of the compensating cylinder 16 is displaced in opposite directions to the piston 2 of the working cylinder 1, which provides for a corresponding mass balance for a substantial mass balance. The hydraulic springs 4 and 5 act in this case, on the one hand, the working cylinder 1 and on the other hand, the compensating cylinder 16th

Damit die Mittellage der Kolben 2, 18 des Arbeitszylinders 1 und des Ausgleichszylinders 16 voneinander unabhängig hinsichtlich ihrer Mittellage eingestellt werden können, ist ein weiteres Steuerventil 20 vorgesehen. Die Einstellung der Resonanzfrequenz erfolgt entsprechend den für den Arbeitszylinder 1 getroffenen Maßnahmen durch einen Kolben 12, der mit einem Stellkolben 14 in einem Stellzylinder 13 verbunden ist und über ein Stellventil 15 angesteuert wird.Thus, the center position of the pistons 2, 18 of the working cylinder 1 and the compensating cylinder 16 can be adjusted independently of each other with respect to their central position, another control valve 20 is provided. The adjustment of the resonant frequency is carried out according to the measures taken for the working cylinder 1 by a piston 12 which is equipped with a control piston 14 is connected in a control cylinder 13 and is controlled by a control valve 15.

Aufgrund der Anordnung der Zylinder 1 und 16 parallel nebeneinander tritt trotz des Massenausgleichs in Hubrichtung der Kolben 2 und 18 ein freies Massenmoment auf, das vermieden werden kann, wenn die Zylinder 1 und 16 koaxial angeordnet werden.Due to the arrangement of the cylinders 1 and 16 in parallel juxtaposed occurs in spite of the mass balance in the stroke direction of the piston 2 and 18, a free mass moment, which can be avoided if the cylinders 1 and 16 are arranged coaxially.

In der Fig. 3 ist ein Nadelbrett 21 in einer Ansicht in Vliesdurchlaufrichtung dargestellt, das an einem Nadelbalken 22 in herkömmlicher Weise lösbar befestigt ist. Zum Antrieb des Nadelbrettes 21 in Einstichrichtung der Nadeln 23 ist der Nadelbalken 22 mit parallelen Stoßstangen 24 verbunden, die jeweils eine Kolbenstange 3 eines hydrostatischen Resonanzantriebes bilden, wie er in der Fig. 2 näher dargestellt ist. Zum Unterschied zu der Ausführungsform nach der Fig. 2 bilden jedoch die Kolben 18 der Ausgleichszylinder 16 die Ausgleichsmasse 19. Das Nadelbrett 21 wird somit über den an den beiden Stoßstangen 24 angreifenden hydrostatischen Resonanzantrieb mit einer der Resonanzfrequenz dieses Antriebes entsprechenden Einstichfrequenz angetrieben. Es muß lediglich für eine Synchronisation der beiden Arbeitszylinder gesorgt werden, was hydraulisch, mechanisch oder regelungstechnisch vorgenommen werden kann.In Fig. 3, a needle board 21 is shown in a view in non-woven direction, which is releasably attached to a needle bar 22 in a conventional manner. To drive the needle board 21 in the piercing direction of the needles 23 of the needle bar 22 is connected to parallel bumpers 24, each forming a piston rod 3 of a hydrostatic resonance drive, as shown in more detail in FIG. In contrast to the embodiment according to FIG. 2, however, the pistons 18 of the compensating cylinder 16 form the balancing mass 19. The needle board 21 is thus driven by the engaging on the two bumpers 24 hydrostatic resonance drive with a resonant frequency of this drive corresponding puncture frequency. It only needs to be taken care of a synchronization of the two cylinders, which can be done hydraulically, mechanically or control technology.

Gemäß der Fig. 4, die ein Nadelbrett 21 in einer Seitenansicht zeigt, ist der Resonanzantrieb mit den Kolbenstangen 3 zu einer Baueinheit 25 zusammengefaßt, die um eine quer zur Vliesdurchlaufrichtung 26 verlaufende Achse 27 schwenkbar in einem Gestell gelagert ist. Aufgrund dieser verschwenkbaren Lagerung der Baueinheit 25 kann das Nadelbrett 21 in Vliesdurchlaufrichtung 26 hin- und hergehend verlagert werden, wie dies durch die Pfeile 28 angedeutet ist. Der Schwenkantrieb 29 für diese zusätzliche Bewegung des Nadelbrettes 21 kann unterschiedlich gestaltet sein und in herkömmlicher Weise aus einem Exzentertrieb bestehen. Besonders günstige Antriebsverhältnisse ergeben sich allerdings, wenn der Schwenkantrieb 29 ebenfalls aus einem hydrostatischen Resonanzantrieb gebildet wird, wie er in den Fig. 1 und 2 dargestellt ist. In diesem Fall ist die durch den Resonanzantrieb gebildete Baueinheit wiederum um eine gestellfeste Achse 30 schwenkbar zu lagern, um die Kolbenstange 3 ohne Zwischengestänge unmittelbar an der Baueinheit 25 anlenken zu können, wie dies in der Fig. 4 dargestellt ist.According to FIG. 4, which shows a needle board 21 in a side view, the resonance drive is combined with the piston rods 3 to form a structural unit 25, which is mounted so as to be pivotable in a frame about an axis 27 extending transversely to the nonwoven passage direction 26. Because of this pivotable mounting of the assembly 25, the needle board 21 can be moved back and forth in nonwoven web direction 26, as indicated by the arrows 28. The pivot drive 29 for this additional movement of the needle board 21 may be designed differently and consist of a Exzentertrieb in a conventional manner. However, particularly favorable drive conditions arise when the pivot drive 29 is likewise formed from a hydrostatic resonance drive, as shown in FIGS and FIG. 2 is shown. In this case, the structural unit formed by the resonance drive is again pivotable about an axis fixed to the frame 30, in order to be able to articulate the piston rod 3 directly to the structural unit 25 without intermediate linkage, as shown in FIG.

Claims (7)

Vorrichtung zum Nadeln eines Vlieses mit wenigstens einem Nadelbrett, das mit in Einstichrichtung geführten Stoßstangen verbunden ist, und mit wenigstens einem an den Stoßstangen angreifenden Antrieb für das Nadelbrett, dadurch gekennzeichnet, daß der Antrieb als hydrostatischer Resonanzantrieb ausgebildet ist, der wenigstens einen Arbeitszylinder (1) mit einem beidseitig über je eine hydraulische Feder (4, 5) beaufschlagten Kolben (2) sowie eine Einrichtung zur Druckbeaufschlagung des Kolbens (2) mit einer Frequenz umfaßt, die der Resonanzfrequenz des sich aus den bewegten Massen und den hydraulischen Federn (4, 5) ergebenden Schwingungssystems entspricht.Device for needling a nonwoven fabric having at least one needle board connected to bumpers guided in the piercing direction, and having at least one drive for the needle board engaging the bumpers, characterized in that the drive is designed as a hydrostatic resonance drive which comprises at least one working cylinder (1 ) comprising a piston (2) acted upon on both sides by a respective hydraulic spring (4, 5) and a device for pressurizing the piston (2) at a frequency corresponding to the resonance frequency of the moving masses and the hydraulic springs (4, 5) resulting vibration system corresponds. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß wenigstens zwei Arbeitszylinder vorgesehen sind, deren mit den Kolben (2) verbundene Kolbenstangen (3) als Stoßstangen (24) ausgebildet sind.Apparatus according to claim 1, characterized in that at least two working cylinders are provided, whose piston rods (3) connected to the pistons (2) are designed as bumpers (24). Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Nadelbrett (21) mit dem hydrostatischen Resonanzantrieb eine um eine quer zur Vliesdurchlaufrichtung (26) drehbar gelagerte Baueinheit (25) bildet, an der ein Schwingungsantrieb (29) angreift.Device according to claim 1 or 2, characterized in that the needle board (21) with the hydrostatic resonance drive forms a constructional unit (25) mounted rotatably about a cross-web direction (26) against which a vibration drive (29) acts. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß der Schwingungsantrieb (29) als hydrostatischen Resonanzantrieb mit einem Arbeitszylinder (1) und einem beidseits von hydraulischen Federn (4, 5) beaufschlagten Kolben (2) ausgebildet ist.Apparatus according to claim 3, characterized in that the oscillation drive (29) as a hydrostatic resonance drive with a working cylinder (1) and on both sides of hydraulic springs (4, 5) acted upon piston (2) is formed. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Arbeitszylinder (1) zumindest auf einer Stirnseite offen ausgebildet ist und mit der offenen Stirnseite in das Gehäuse (6) der zugehörigen hydraulischen Feder (4, 5) ragt.Device according to one of claims 1 to 4, characterized in that the working cylinder (1) is open at least on one end face and with the open end face in the housing (6) of the associated hydraulic spring (4, 5) protrudes. Vorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der Antrieb neben dem Arbeitszylinder (1) einen gleichachsigen Ausgleichszylinder (16) aufweist, wobei der Arbeitszylinder (1) und der Ausgleichszylinder (16) auf der gleichen Kolbenseite miteinander hydraulisch verbunden und auf der gegenüberliegenden Seite an je einer hydraulischen Feder (4, 5) angeschlossen sind, und daß der Kolben (18) des Ausgleichszylinders (16) eine Ausgleichsmasse (19) trägt.Device according to one of claims 1 to 5, characterized in that the drive next to the working cylinder (1) has an equiaxial compensating cylinder (16), wherein the working cylinder (1) and the compensating cylinder (16) hydraulically connected to each other on the same piston side and on the opposite side to a respective hydraulic spring (4, 5) are connected, and that the piston (18) of the compensating cylinder (16) carries a balancing mass (19). Vorrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß das Volumen des Gehäuses (6) zumindest für eine der beiden hydraulischen Federn (4, 5) des Arbeitszylinders (1) einstellbar ist.Device according to one of claims 1 to 6, characterized in that the volume of the housing (6) is adjustable at least for one of the two hydraulic springs (4, 5) of the working cylinder (1).
EP20060450146 2005-10-27 2006-10-17 Apparatus for needling a nonwoven material Not-in-force EP1780324B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT0175005A AT502044B1 (en) 2005-10-27 2005-10-27 Apparatus for needling nonwovens comprises a hydrostatic resonance drive comprising pistons acted upon on both sides by hydraulic springs and a device for applying pressure to the pistons at a resonance frequency

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EP1780324A1 true EP1780324A1 (en) 2007-05-02
EP1780324B1 EP1780324B1 (en) 2013-10-16

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US (1) US7308744B2 (en)
EP (1) EP1780324B1 (en)
JP (1) JP2007119998A (en)
CN (1) CN1990932A (en)
AT (1) AT502044B1 (en)
TW (1) TW200730687A (en)

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CN104131417A (en) * 2014-07-17 2014-11-05 青岛铠硕纺机有限公司 Non-woven cloth production line
CN107881654A (en) * 2017-12-12 2018-04-06 常熟市振泰无纺机械有限公司 The needing machine of large tank structure

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CN101960065B (en) * 2008-03-03 2012-03-14 欧瑞康纺织有限及两合公司 Device for needling a web of fiber
ATE530692T1 (en) * 2009-08-14 2011-11-15 Dilo Kg Maschf Oskar DRIVE AND GUIDE DEVICE IN A NEEDLE MACHINE

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CN107881654A (en) * 2017-12-12 2018-04-06 常熟市振泰无纺机械有限公司 The needing machine of large tank structure

Also Published As

Publication number Publication date
AT502044A4 (en) 2007-01-15
TW200730687A (en) 2007-08-16
JP2007119998A (en) 2007-05-17
CN1990932A (en) 2007-07-04
EP1780324B1 (en) 2013-10-16
US7308744B2 (en) 2007-12-18
US20070101562A1 (en) 2007-05-10
AT502044B1 (en) 2007-01-15

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