EP3650595A1 - Compensation device - Google Patents

Compensation device Download PDF

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Publication number
EP3650595A1
EP3650595A1 EP18205499.9A EP18205499A EP3650595A1 EP 3650595 A1 EP3650595 A1 EP 3650595A1 EP 18205499 A EP18205499 A EP 18205499A EP 3650595 A1 EP3650595 A1 EP 3650595A1
Authority
EP
European Patent Office
Prior art keywords
damping
storage
storage tape
run
compensation
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.)
Pending
Application number
EP18205499.9A
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German (de)
French (fr)
Inventor
Johann Philipp Dilo
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.)
Oskar Dilo Maschinenfabrik KG
Original Assignee
Oskar Dilo Maschinenfabrik KG
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 Oskar Dilo Maschinenfabrik KG filed Critical Oskar Dilo Maschinenfabrik KG
Priority to EP18205499.9A priority Critical patent/EP3650595A1/en
Publication of EP3650595A1 publication Critical patent/EP3650595A1/en
Pending legal-status Critical Current

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    • DTEXTILES; PAPER
    • D04BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04HMAKING 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
    • D04H1/00Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/70Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
    • DTEXTILES; PAPER
    • D01NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01GPRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G23/00Feeding fibres to machines; Conveying fibres between machines
    • DTEXTILES; PAPER
    • D01NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01GPRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G25/00Lap-forming devices not integral with machines specified above
    • DTEXTILES; PAPER
    • D04BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04HMAKING 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
    • D04H1/00Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/70Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
    • D04H1/74Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being orientated, e.g. in parallel (anisotropic fleeces)

Abstract

A compensation device (1) according to the invention for compensating fluctuating conveying speeds of a material web (16), in particular a fibrous or nonwoven web, comprises an endlessly rotating storage belt (2), the storage belt (2) having a variable sag (4) and via two deflection rollers ( 6), the variable sag (4) of the storage belt (2) being arranged at least between the two deflection rollers (6). The compensation device (1) further comprises a damping device (14) which is arranged in the region of the variable sag (4) at a distance (D) from the storage tape (2) which is smaller than the vibration amplitude (A) of expected vibrations (18 ) of the storage tape (2) in the area of the variable sag (4).

Description

  • The present invention relates to a compensation device and a method for compensating fluctuating conveying speeds of a material web, in particular a fibrous web or nonwoven web.
  • For the production of multilayer nonwovens, corresponding material webs pass through a plurality of work stations arranged in a row. A fiber flock web is fed to a card, which is broken down into individual fibers and is discharged on the outlet side as an unconsolidated textile fiber web. In a non-woven layer, the fibrous web is placed on a discharge belt in a predetermined laying width in several layers. For example, a lay-up carriage is moved back and forth across the discharge belt while the discharge belt is moving in the discharge direction. Due to the fluctuating movement of the laying carriage and the associated acceleration and braking processes, the discharge belt must be moved synchronously to ensure the formation of a uniform nonwoven web. In the following the nonwoven web is e.g. solidified in a needle machine. The nonwoven web is generally consolidated at a constant conveying speed of the nonwoven web.
  • It may therefore be necessary at several points during the nonwoven fabrication process, in particular between the nonwoven layer and the consolidation device, to convert the material web present at the respective time from a variable conveying speed to a constant conveying speed or vice versa. For this purpose, compensation devices can be provided along the conveying path of the respective material web, such as those from the EP 1 643 022 A1 are known. The device described therein has an endless, continuously driven storage belt with two deflection rollers. The nonwoven web is arranged on the upper run of the storage belt and temporarily stored in a variable sag of the upper run if required. In this way, differences in speed of the material web at the inlet of the compensating device and at the outlet of the compensating device, that is to say, for example, between a fleece layer and a needle machine, can be compensated. The size of the sag and the fleece storage formed by it is determined by the speed differences. Since the outlet of the compensating device is assigned to the inlet of the needle machine, the material web is moved there at a constant speed. The inlet side speed the material web results from the initial speed of the same from the fleece layer and varies according to the speed of the discharge belt. If the input speed is now greater than the constant output speed, the length of the material web to be stored in the compensation device increases. If the input speed is lower than the output speed at another time, the length of the material web to be stored is reduced again. This can be achieved in that the sag of the storage tape is increased or decreased in accordance with the length of the material web to be stored, that is to say as a function of the speed difference.
  • A disadvantage of such compensation devices is that vibrations of the storage belt in the region of the variable sag can occur at high conveying speeds. These vibrations can be excited, for example, by the alternating acceleration and deceleration when the running-in speed changes. The vibration amplitude of these vibrations can assume dimensions that lead to the material structure in the material web being undesirably negatively influenced. The conveyed material web can also be set in oscillation or vibration, the material web can partially lift off the storage belt and its fibers or layers can be swirled.
  • It is therefore the object of the present invention to provide an apparatus and a method which make it possible to compensate for fluctuating speed differences in the nonwoven manufacturing process and at the same time ensure high quality of the nonwoven.
  • This object is solved by the features of claims 1 and 12, respectively. Advantageous refinements are the subject of the dependent subclaims.
  • According to the invention, a compensation device for compensating for fluctuating conveying speeds of a material web, in particular a fibrous web or nonwoven web, comprises an endlessly rotating storage belt for conveying the material web in a conveying direction through the compensating device, the storage belt having a variable sag and being guided over two deflection rollers which run in the conveying direction are arranged at a distance from one another, the variable sag of the storage tape is arranged at least between the two deflection rollers. According to the invention, the compensation device further comprises a damping device, which is arranged in the area of the variable sag at a distance from the storage tape that is smaller than the vibration amplitude of expected vibrations of the storage tape in the area of the variable sag.
  • In this way it is achieved that occurring vibrations of the storage belt can be damped or completely prevented, thereby avoiding negative effects on the quality of the material web being conveyed. Vibrations that build up are damped as soon as their vibration amplitude is greater than or equal to the distance between the damping device and the storage tape. The energy required for the vibration is lost to the storage tape when it strikes the damping device, which prevents the storage tape from swinging up. In the vibration-free state, e.g. at slow conveying speeds of up to 10 m / min, the damping device is arranged at a distance from the storage belt and therefore causes no frictional losses.
  • The expected vibrations of the storage tape in the area of the variable sag can be determined both mathematically and experimentally. The vibrations are largely determined by the excitation of the storage tape as well as the vibration properties of the storage tape, in particular its material, dimensions, and the free length of the storage tape between the deflection rollers. The material web conveyed on the storage belt also has an effect on the vibration properties of the storage belt.
  • The expected vibrations of the storage tape can therefore be determined individually for each compensation device. It may be desirable to dampen vibrations with very small vibration amplitudes, which are essentially noticeable as vibrations in the storage tape. It may also be desirable to dampen only vibrations of larger vibration amplitudes, in which negative influences on the material structure of the material web are known. Correspondingly, the distance between the damping device and the storage tape can be less than 1 mm, but can also be several centimeters. The expected and / or absolutely to be avoided vibration states are to be determined by the user and are also referred to below as critical vibrations.
  • In order to ensure the highest possible quality of the material webs, the distance between the damping device and the storage tape is preferably less than 5 cm, more preferably less than 2 cm, even more preferably less than 1 cm or less than 5 mm.
  • It goes without saying that, especially in the case of distances between the damping device and the storage tape in the region of a few millimeters, contact between the damping device and the storage tape can also occur in sections when there are no major vibrations.
  • In a preferred embodiment of the compensation device, the storage tape comprises an upper run and a lower run, and the variable sag is formed at least in the upper run of the storage tape. The damping device is accordingly arranged at least in the region of the variable sag of the upper run of the storage tape. The material web is arranged on the upper run of the storage belt and is conveyed from the upper run by the compensation device. Accordingly, the variable sag of the upper run is decisive for the storage of the material web and the compensation of the occurring speed fluctuations of the material web. Vibrations of the upper run have a direct impact on the guidance and quality of the material web and can be specifically prevented in this way.
  • In order to make the damping device structurally simple, the damping device can preferably be arranged stationary. A stationary damping device can be formed, for example, by a flat or curved plate which is mounted in the area of the variable sag. Such a sheet extends at least in sections along the storage tape in a specific state of the storage tape. If the sheet is curved, the curvature is adapted to the sag of the storage tape in the respective state as possible and is preferably arranged in the region of the apex of the sag. Instead of flat elements, such as sheet metal, it is also possible to provide rods or bars with an essentially round or rectangular cross section, which extend linearly or curvedly along at least a section of the storage tape and of which a plurality are preferably arranged next to one another in the transverse direction of the storage tape. Alternatively, a stationary damping device can also be provided by a Airbag can be made of textile or plastic, which is connected to a compressed air source.
  • However, the damping device can also be designed in such a way that it can be carried along at least in sections with the variable sag of the storage tape, as a result of which the damping device can be adapted to different vibration states or different vibration amplitudes to be avoided with the greatest possible flexibility. Sheet metal or rod-shaped damping elements, as described above, can be designed flexibly for this purpose and can be mounted and clamped in such a way that their deflection can be changed in accordance with the variation in the sag. Rigid (sheet or rod-shaped) elements can also be provided, which are moved linearly with the sag or which are pivotally mounted in order to follow the sag. Curved rigid elements can also be moved with the sag, even if their contour is no longer completely adapted to that of the sag, as long as at least regions of the elements are arranged so close to the storage tape that vibrations that occur are damped. An airbag can be designed, for example, by changing the air volume it contains or by shifting the entire airbag such that it can be carried along with the sag of the storage tape.
  • It can be the case that particularly critical vibrations only occur in certain states of the storage tape or the variable sag of the storage tape and only these vibrations are to be damped in a targeted manner. A stationary damping device, which is arranged in the region of the variable sag in which the critical vibrations occur, would be sufficient in this case. For example, critical vibrations can occur when a maximum sag of the storage tape has been reached and the free length of the storage tape between the two deflection rollers assumes the greatest possible length.
  • However, it can also be the case that, due to the vibration properties of the storage tape, a critical state is reached between the minimum and the maximum sag of the storage tape. The damping device can then be arranged stationary in the corresponding area or at least in sections can be carried along with the storage tape. The damping device can also be carried along the entire path between the minimum and maximum sag of the storage tape, in order to be able to do so in all To enable intermediate states to dampen vibrations that occur. In this case, the distance between the damping device and the storage tape can be constant or can preferably vary depending on the expected vibration amplitudes.
  • However, the compensation device can also have one or more sensors which detect the occurrence of vibrations in the storage tape. By means of a control device, the damping device can be controlled such that it approaches the storage tape as soon as the sensors detect the occurrence of vibrations. A predetermined limit value can also be stored in the control device, e.g. a value of a vibration amplitude, and the control device does not intervene until the vibrations that occur exceed this limit value. Such a sensor can be a non-contact sensor (e.g. a light barrier or laser sensor) or a pressure sensor. Other alternatives are apparent to the person skilled in the art.
  • The damping device is preferably arranged essentially parallel to the storage tape. This means that the contour of the damping device essentially follows the contour of the variable sag of the storage tape. The distance between the damping device and the storage tape can also vary slightly and deviate from an exactly parallel course, which is due in particular to the mounting of the damping device.
  • In a preferred embodiment, the damping device is arranged inside a loop formed by the circumferential storage tape. This enables a space-saving construction of the compensation device. In addition, damping devices can thereby be used which dampen both the upper run and the lower run of the storage band and do not hinder the variable sag of the storage band.
  • The damping device is preferably a passive damping device, as a result of which a simple mechanical and control engineering structure is achieved. In contrast to an active damping device, the passive damping device does not actively counteract vibrations, for example by generating counter-vibrations. Much more occurring vibrations are prevented by depriving them of the energy required to vibrate.
  • The variable sag is particularly preferably formed in an upper run and a lower run of the storage tape, and the damping device is arranged both in the region of the variable sag of the upper run and in the region of the variable sag of the lower run. The variable sag of the lower run varies in the opposite direction to the variable sag of the upper run in order to enable the variable increase or decrease in the variable sag of the upper run with a constant length of the endless storage tape. Since the lower run does not convey the material web, vibrations of the lower run do not have a direct effect on the material web and are therefore to be regarded as less critical. Nevertheless, it may be desirable to also prevent vibrations in the lower run of the storage belt, for example in order to avoid air turbulence which acts on the transported material web through the spaces between the slats of the upper run of the storage belt. Correspondingly, the damping device is then also arranged in the region of the variable sag of the lower run at a distance from the storage tape that is smaller than the vibration amplitude of expected vibrations of the lower run.
  • In a preferred embodiment, the damping device comprises at least one damping element that is flexible and extends between the two deflection rollers. Due to the flexibility of the at least one damping element, its shape can be easily adapted, at least in sections, to the variable sag of the storage tape. The at least one damping element can be assigned to the upper run or the lower run of the storage tape. When viewed across the working width of the storage belt, that is to say transversely to the conveying direction, a damping element can preferably be arranged in the center. Several damping elements can also be provided distributed over the working width. The at least one damping element can be flat or rod-shaped. The at least one damping element is preferably designed as a spring bar or leaf spring
  • The at least one damping element is preferably rotatably mounted on the two deflection rollers relative to the deflection rollers. This results in a particularly space-saving Storage and arrangement of the damping device in the compensation device. The damping element is not influenced by the rotational movement of the deflection rollers.
  • The damping device further preferably comprises two damping elements, a first damping element being assigned to an upper strand of the storage band and being bendable at least in the direction of a lower strand of the storage band and a second damping element being associated with the lower strand and being bendable at least in the same direction as the first damping element. As a result, it is particularly advantageous to provide a damping device which dampens both the upper run and the lower run of the storage tape and can be integrated into the compensation device in a space-saving manner.
  • The first and the second damping element are preferably coupled to one another in such a way that they can be adjusted together. On the one hand, the damping device is then designed such that it can follow the variable sag in the upper run and in the lower run, in order to enable damping in different states of the variable sag. On the other hand, the damping device is thereby easily drivable and controllable. In particular, a drive for adjusting the damping elements is sufficient.
  • A method according to the invention for compensating fluctuating conveying speeds of a material web, in particular a fibrous web or nonwoven web, comprises:
    • Conveying the material web by means of a storage belt in a conveying direction from an inlet to an outlet;
    • Changing a variable sag of the storage belt as a function of the speed difference between the conveying speed of the material web at the inlet and the conveying speed of the material web at the outlet;
    • Arranging a damping device in the area of the variable sag at a distance from the storage tape that is smaller than the vibration amplitude of expected vibrations of the storage tape in the area of the variable sag, and thereby damping vibrations that occur.
  • In this way it is achieved that occurring vibrations of the storage belt can be damped or completely prevented, thereby avoiding negative effects on the quality of the material web being conveyed. Vibrations that build up are dampened as soon as their vibration amplitude is greater than or equal to the distance between the Damping device to the storage tape is. The energy required for the vibration is lost to the storage tape when it hits the damping device, which prevents the storage tape from swinging up.
  • The arrangement of the damping device preferably includes carrying the damping device with the variable sag of the storage tape, which makes it possible to damp vibrations in several states of the variable sag of the storage tape.
  • Particularly preferably, carrying the damping device with the variable sag of the storage tape comprises changing the bend of at least one damping element of the damping device. As a result, a damping device can be used which is particularly simple to implement and, above all, is easily adaptable to the variable sag currently present.
  • Finally, it is preferred that the storage tape is guided over two deflecting rollers which are arranged at a distance from one another in the conveying direction, the variable sag of the storage tape being arranged at least between the two deflecting rollers, and the damping device follows the free variable sag of the storage tape which is caused by the Length of the storage tape between the pulleys and the distance between the two pulleys is defined.
  • The storage tape is not influenced by the damping device in an undesired or uncontrolled manner. In particular, the damping device does not serve as a deflection point or deflection element of the storage tape. The variable sag of the storage tape only changes as a function of the fluctuating speed differences at the inlet and outlet of the compensation devices. The damping device is only carried along or follows the free variable sag in such a way that it dampens vibrations that occur.
  • Further features and advantages of the present invention will become apparent from the following description with reference to the drawings.
  • Fig. 1
    shows a cross-sectional view of an embodiment of a compensation device according to the invention in an initial state;
    Fig. 2
    shows in a cross-sectional view the compensation device according to the invention Fig. 1 with changed sag;
    Fig. 3
    shows a perspective view of a detail from the compensation device according to the invention 1 and 2 ; and
    Fig. 4
    shows in a cross-sectional view schematically an enlarged section of the compensation device according to the invention 1 and 2 .
  • The Figures 1 and 2 show an embodiment of a compensation device 1 according to the invention for compensating fluctuating conveying speeds of a material web 18 (see Fig. 4 ). The compensation device 1 comprises an endlessly rotating storage belt 2 for conveying the material web in a conveying direction F through the compensation device 1. The storage belt 2 can be formed, for example, by slatted toothed belts. The storage belt 2 has a variable sag 4 in order to enable the transition of the material web from a conveyor with fluctuating conveyor speeds to a conveyor with constant speed. The storage tape 2 is over two deflection rollers 6 (see Fig. 3 ) guided, which are arranged spaced apart in the conveying direction F. The material web to be conveyed is arranged on the upper run 10 of the storage belt 2 and is conveyed by the latter through the compensation device 1.
  • The first pulley 6 (in Fig. 1 arranged concealed on the left side) is arranged on the input side of the compensation device 1 and the second deflection roller 6 (in Fig. 1 concealed on the right side) is arranged on the output side of the compensation device 1. On the input side, the compensation device 1 preferably receives a material web from a nonwoven layer. The discharge belt of the nonwoven layer can directly adjoin the storage belt 2 guided around the first deflection roller 6 for transfer of the material web, or one or more feed belts can be interposed be. The first deflection roller 6 is preferably driven at a fluctuating speed in synchronism with the discharge belt of the nonwoven layer.
  • In the conveying direction F, a feed belt of the subsequent consolidation device, for example a needle machine, adjoins the second deflection roller 6 arranged on the outlet side. In the area of the second deflection roller 6, the material web is transferred from the storage belt 2 to the feed belt of the consolidation device. The second deflection roller 6 is therefore preferably driven in constant synchronization with the feed belt of the consolidation device.
  • In addition to the deflection rollers 6, further deflection elements or deflection rollers can be provided in order to span the storage tape 2. For example, the upper run 10 of the storage belt 2 can be guided over a further deflection roller arranged upstream of the first deflection roller 6 in the conveying direction F and / or a deflection roller arranged downstream of the second deflection roller 6. Likewise, one or more deflection rollers can be provided for clamping the lower run 12 of the storage tape 2.
  • The variable sag 4 of the storage tape 2 is arranged at least between the two deflection rollers 6. In the embodiment shown, the variable sag 4 is formed both in the upper strand 10 and in the lower strand 12 of the storage tape 2. To compensate for fluctuating conveying speeds of the material web, it is sufficient if at least the upper run 10 has a variable sag 4. The lower run 12 can be guided via alternative compensating mechanisms in order to enable a variable sag 4 in the upper run 10 with a constant length of the endless storage tape 2.
  • From the synopsis of Figures 1 to 3 the mode of operation of the compensation device 1 can be seen. At the second deflecting roller 6, the storage belt 2 and the material web arranged thereon are held at a constant speed V const . moved in the direction of conveyance F. On the input side, the storage belt 2 and the material web arranged thereon are moved to the first deflecting roller 6 and at a variable speed V var . emotional. The variable speed V var . is synchronous with the speed of the conveyor belt of the fleece layer and fluctuates between values that are partly larger and partly smaller than the constant speed V const . are. In particular, the storage tape 2 on the first deflection roller 6 braked to a standstill and at speeds greater than the constant speed V const . be accelerated. Is the variable speed V var . at certain times or over a certain period of time greater than the constant speed V const ., more storage tape 2 is moved between the two deflection rollers 6 than is moved out of this area by the second deflection roller 6. The variable sag 4 of the upper run 10 of the storage tape 2 increases accordingly, as in FIG Fig. 2 you can see. The material web additionally supplied by the excess speed is temporarily stored in the variable sag 4. Since the storage tape 2 has a substantially constant length, the variable sag 4 of the lower run 12 of the storage tape 2 decreases as soon as the sag of the upper run 10 increases.
  • The variable speed V var decreases. to the extent that it is less than the constant speed V const . is, more storage tape 2 and material web is moved out of the area between the two deflection rollers 6 than is moved into this area by the first deflection roller 6. The variable sag 4 of the upper run 10 of the storage tape 2 decreases accordingly, while the variable sag 4 of the lower run 12 of the storage tape 2 increases again.
  • The compensation device 1 further comprises a damping device 14, which in the Figures 1 to 3 is shown in a preferred embodiment. A section of the cross-sectional view of the upper run 10 of the storage tape 2 according to FIG 1 and 2 is in Fig. 4 shown in a detailed view.
  • The damping device 14 is arranged in the area of the variable sag 4 at a distance from the storage tape 2 that is smaller than the vibration amplitude of expected vibrations of the storage tape 2 in the area of the variable sag 4. In the preferred embodiment according to FIG 1 and 2 the damping device 14 is arranged both in the area of the variable sag 4 of the upper run 10 and in the area of the variable sag 4 of the lower run 12. It can also be seen that the damping device 14 is preferably arranged in the interior of a loop formed by the circumferential storage tape 2, in order to enable a space-saving configuration of the compensation device 1. It is understood that the damping device 14 only can be arranged in the area of the upper run 10 or the lower run 12 of the storage tape 2, as well as outside of the loop formed by the storage tape 2.
  • In some embodiments, the distance between the damping device 14 and the storage tape 2 can be so small that it can hardly be recognized. In Fig. 4 Therefore, a detailed view of the cross section of the upper run 10 in the area of the variable sag 4 is shown in order to illustrate the principle according to the invention. It goes without saying that the statements made for this purpose can also be transferred to the lower run 12, whereby this does not convey any material web.
  • The storage tape can be made to vibrate, for example, on account of the speed fluctuations at the input of the compensation device 1. In particular, between the two deflection rollers 6, between which the variable sag 4 is formed, so-called rope vibrations of the storage belt 2 can occur. A sinusoidal oscillation 18 of the storage tape 2 in is exemplary Fig. 4 indicated by a dashed line. The form and amplitude of the oscillations depend specifically on the storage tape 2 used, its storage and its excitation. For each storage tape 2 used, the expected vibrations and vibration amplitudes can be determined by calculation or experiment.
  • The damping device 14 is arranged in the area of the variable sag 4 at a distance D from the storage tape 2 that is smaller than the vibration amplitude A of the expected vibration 18 of the storage tape 2 in the area of the variable sag 4. If the storage tape 2 is excited to oscillate, this vibration is damped as soon as its amplitude is so large that the storage tape 2 touches the damping device 14. At this moment, the damping device 14 takes the energy required for the further build-up of the vibrations from the storage tape 2. The occurrence of an oscillation 18, the amplitude A of which is greater than the distance D of the damping device 14 from the storage tape 2, is thereby prevented. By selecting the distance D between the damping device 14 and the storage tape 2, undesired vibrations can be damped in a targeted manner.
  • Basically, the distance to be selected for the damping device 14 from the storage tape 2 depends on the specific application. To avoid vibrations that are the distance between the damping device and the storage tape is preferably less than 5 cm, more preferably less than 2 cm, even more preferably less than 1 cm or less than 5 mm.
  • Further features and properties of the damping device 14 are described below using the in 1 to 3 illustrated preferred embodiment explained, but can also be easily transferred to other embodiments.
  • The damping device 14 is arranged essentially parallel to the storage tape 2. If the damping device 14 is arranged both in the region of the upper strand 10 and in the region of the lower strand 12 of the storage tape 2, it preferably has a first damping element 20 and a second damping element 22. The first damping element 20 is assigned to the upper run 10 of the storage tape 2 and can be bent at least in the direction of the lower run 12. The second damping element 22 is assigned to the lower run 12 and can be bent at least in the same direction as the first damping element 20. The first damping element 20 runs essentially parallel to the upper run 10 and the second damping element 22 runs essentially parallel to the lower run 12 of the storage tape 2. The damping device 14, here the first and the second damping element 20, 22, can be mounted on the deflection rollers 6. The distance between the damping device 14 and the storage belt 2 in the region of the deflection rollers 6 is consequently less than in the region of the apex of the variable sag 4. Accordingly, deviations from an exactly parallel course of the damping device 14 and the storage belt 2 can occur.
  • The damping device 14 can be arranged in a stationary manner in order to be arranged only in a predetermined state of the variable sag 4 of the storage tape 2 in the region of the vibration amplitude of the vibrations of the storage tape to be expected. For example, it may be sufficient if the damping device 14 is arranged at a maximum or minimum sag of the upper strand 10 at a distance from the storage tape 2 that is smaller than the vibration amplitude of expected vibrations of the storage tape 2 in the region of the variable sag 4. Additionally or alternatively the damping device 14 can also be arranged only with a maximum or minimum sag of the lower run 12 at a distance from the lower run 12 which is smaller than the vibration amplitude of expected vibrations of the lower run 12. This has the advantage that the damping device 14 can be made very simple and a mechanism for adjusting or carrying the damping device 14 with the variable sag 4 of the storage tape 2 can be omitted.
  • However, it is preferred that the damping device 14 is designed such that it can be carried along with the variable sag 4 of the storage tape 2 at least in sections. It is thereby achieved that the damping device 14 dampens critical or disruptive vibrations of the storage tape 2 in several states of the variable sag 4.
  • Carrying the damping device 14 with the variable sag 4 can, for example, by the in the 1 and 2 illustrated embodiment can be easily implemented. For this purpose, the damping device 14 comprises at least the first damping element 20, preferably also the second damping element 22. The damping elements 20, 22 are flexible and extend at least partially, but preferably completely, between the two deflection rollers 6. The flexibility of the damping elements 20, 22 achieves this that they can be bent in accordance with the variable sag 4 in order to be carried along with the free variable sag. The damping elements 20, 22 are designed, for example, as spring bars or leaf springs. In this case, a damping element 20, 22 can be arranged in a transverse direction of the storage belt 2, which extends transversely to the conveying direction F and in the plane of the surface of the storage belt 2 receiving the material web 16. In order to reliably prevent vibrations over the entire width of the storage tape 2, it is preferred, however, that a plurality of first damping elements 20 and a plurality of second damping elements 22 are arranged next to one another in the transverse direction and distributed over the width of the storage tape.
  • In Fig. 3 the crossbars of the storage tape 2 are not shown for better clarity. How out Fig. 3 is evident, the at least one damping element, here the first and the second damping element 20, 22, is rotatably mounted relative to the deflection rollers 6.
  • At least one toothed belt pulley is rotatably mounted on the deflecting rollers 6 or is formed integrally with the deflecting roller 6 in order to engage with and drive the storage tape 2.
  • Offset to the toothed belt pulleys, at least one adjusting pulley 24, 26 can be rotatably mounted on the shaft of the deflection rollers 6 or on the rollers themselves. In the illustrated embodiment, a first shim 24 is rotatably mounted on the shaft of the first deflection roller 6 and a second shim 26 is rotatably mounted on the shaft of the second deflection roller 6.
  • Each damping element 20, 22 is articulated to both shims 24, 26. The positions of the bearing points of the articulated connections between the damping elements 20, 22 and the shims 24, 26 are in Fig. 1 indicated by points 28. In Fig. 1 An initial state of the storage tape 2 is shown in which the variable sag of the upper strand 10 is minimal and the variable sag of the lower strand 12 is maximum. In this initial state, the first damping element 20 has a pretension in the direction of the lower strand 12. This means that the first damping element 20 is bent downward from its bearing points 28 in the direction of the lower run 12. If the second damping element 22 is also provided, it is prestressed in the same direction as the first damping element 20, ie it has a deflection in the same direction. In the initial state, the sag of the upper strand 10 is less than the sag of the lower strand 12, which is why the second damping element 22 is more bent in the initial state than the first damping element 20.
  • In order to enable the sag 4 of the compensation device 1 to be varied and not to be blocked by the damping elements 20, 22, the at least one damping element 20, 22 must be carried along with the variable sag. For this purpose, the first and the second shims 24, 26 are rotated in opposite directions, as indicated by the arrows within the deflection rollers 6 in Fig. 2 is indicated. More precisely, the first shim 24 is rotated clockwise and the second shim 26 counterclockwise around the shaft of the respective deflection roller 6. The bearings 28 of the first damping element 20 after Fig. 1 accordingly move into positions 28 ' Fig. 2 . In the case of the first damping element 20, the distance between the bearing points 28 ′ is behind Fig. 2 in the conveying direction F is less than the distance between the bearing points 28, which causes the deflection of the first Damping element 20 is increased. The apex of the deflection moves downwards accordingly in order to allow a greater sag of the upper run 10 of the storage tape 2. Out Fig. 2 it can be seen that the bearing points 28 of the second damping element 22 follow Fig. 1 move accordingly with the bearing points 28 of the first damping element 20, whereby the deflection of the second damping element 22 is reduced. The distance between the bearing points 28 'is more precise Fig. 2 is greater than the distance between the bearing points 28, as a result of which the apex of the deflection of the second damping element 22 moves upward in order to follow the reduced sag of the lower run 12 of the storage tape 2.
  • The damping device 14 or the damping elements 20, 22 do not effect or influence the variable sag 4 of the storage tape 2. By appropriate adjustment, the damping device enables the free sag to increase or follows the free sag when it is reduced.
  • Various possibilities are apparent to the person skilled in the art for adjusting the damping device 14 or carrying the damping device 14 with the variable sag 4. For example, adjustment means can be provided within the loop formed by the storage tape 2, which effect the respective adjustment. For example, an adjusting means can exert a compressive force on the first damping element 20 in order to move it in the direction of a maximum deflection. The same or a different adjusting means can be provided in order to exert a compressive force on the second damping element 22 in order to move it in the direction of a maximum deflection. In principle, a separate adjustment means can be provided for each damping element 20, 22 or a common adjustment means can be provided for the first and the second damping element 20, 22. The damping device 14 or the damping elements 20, 22 can be adjusted by linear tensile and / or compressive forces or by moments.
  • A particularly preferred embodiment is in the Figures 1 to 3 shown. The first and the second shim 24, 26 each have a ring gear section 30 which extends over part of the circumference of the respective shim 24, 26 and is preferably directed into the interior of the loop formed by the storage tape 2. A first pinion 32 is arranged on the ring gear section 30 of the first adjusting disk 24, which is in engagement with the ring gear section 30. A second pinion 34 is provided on the ring gear section 30 of the second adjusting disk 26 and engages with the ring gear section 30 of the second adjusting disk 26. If a plurality of first damping elements 20 and a plurality of second damping elements 22 and thus a plurality of first adjusting washers 24 and a plurality of second adjusting washers 26 are arranged next to one another across the width of the storage tape 2, a corresponding number of first and second pinions 32, 34 can each be located on a common shaft be arranged or replaced by a rack.
  • At least one drive 36 is provided, which moves one of the first and second pinions 32, 34 cyclically clockwise or counterclockwise. The drive 36 can drive the first or the second pinion 32, 34 directly or via a gear. A separate drive 36 can be provided for each shim 24, 26. Alternatively, as shown, the drive movement is transmitted via a chain 38 and a further sprocket 40 to the other of the first and second sprockets 32, 34. The drive can be a crank drive or a servo motor. Various other drives are known to the person skilled in the art and can be used as desired. The drive 36 can itself be arranged within the loop formed by the storage tape 2. However, the drive movement can also be transmitted to the pinions 32, 34 via a drive shaft, the drive shaft running laterally spaced from the storage belt 2 and transmitting the drive movement to a first shaft of the first pinion 32 or a second shaft of the second pinion 34.
  • The manipulated variable of the regulations for the bending of the at least first damping element 20 results from the speed difference between the variable speed V var . and the constant speed V const ., which are defined by the outfeed speed of the outfeed belt of the nonwoven layer and the infeed speed of the infeed belt of the needling machine.
  • A control device is therefore preferably provided, which controls both the drives of the deflection rollers 6 and the drive 36 of the damping device 14 as a function of the outlet speed of the nonwoven layer and the inlet speed of the feed belt of the needle machine.
  • The damping device can have a rubber pad or a rubber buffer for increased damping.

Claims (15)

  1. Compensation device (1) for compensating for fluctuating conveying speeds of a material web (16), in particular a fibrous web or nonwoven web, comprising
    an endless revolving storage belt (2) for conveying the material web (16) in a conveying direction (F) through the compensation device (1), the storage belt (2) having a variable sag (4) and being guided over two deflection rollers (6), which are arranged at a distance from one another in the conveying direction (F), the variable sag (4) of the storage belt (2) being arranged at least between the two deflection rollers (6); and
    a damping device (14) which is arranged in the region of the variable sag (4) at a distance (D) from the storage band (2) which is smaller than the vibration amplitude (A) of expected vibrations (18) of the storage band (2) in Variable sag area (4).
  2. Compensation device (1) according to claim 1, characterized in that the storage band (2) comprises an upper run (10) and a lower run (12) and the variable sag (4) is formed at least in the upper run (10) of the storage band (2).
  3. Compensation device (1) according to claim 1 or 2, characterized in that the damping device (14) is arranged stationary or is designed such that it can be carried along at least in sections with the variable sag (4) of the storage tape (2).
  4. Compensation device (1) according to one of the preceding claims, characterized in that the damping device (14) is arranged essentially parallel to the storage tape (2).
  5. Compensation device (1) according to one of the preceding claims, characterized in that the damping device (14) is arranged in the interior of a loop formed by the circumferential storage tape (2).
  6. Compensation device (1) according to one of the preceding claims, characterized in that the damping device (14) is a passive damping device (14).
  7. Compensation device (1) according to one of the preceding claims, characterized in that the variable sag (4) is formed in an upper run (10) and in a lower run (12) of the storage tape (2) and the damping device (14) both in the area of the variable sag (4) of the upper run (10) and in the region of the variable sag (4) of the lower run (12).
  8. Compensation device (1) according to one of the preceding claims, characterized in that the damping device (14) comprises at least one damping element (20, 22) which is flexible and extends between the two deflection rollers (6).
  9. Compensation device (1) according to claim 8, characterized in that the at least one damping element (20, 22) on the two deflection rollers (6) is rotatably mounted relative to the deflection rollers (6).
  10. Compensation device (1) according to one of claims 8 and 9, characterized in that the damping device (14) comprises at least two damping elements (20, 22), a first damping element (20) being associated with an upper run (10) of the storage tape (2) and is bendable at least in the direction of a lower run (12) of the storage tape (2) and a second damping element (22) is assigned to the lower run (12) and is bendable at least in the same direction as the first damping element (20).
  11. Compensation device (1) according to claim 10, characterized in that the first and the second damping element (20, 22) are coupled to one another in such a way that they can be adjusted together.
  12. A method for compensating for fluctuating conveyor speeds of a material web (16), in particular a fibrous or nonwoven web, comprising
    Conveying the material web (16) by means of a storage belt (2) in a conveying direction (F) from an inlet to an outlet;
    Changing a variable sag (4) of the storage belt (2) as a function of the speed difference between the conveying speed of the material web (16) at the inlet and the conveying speed of the material web (16) at the outlet;
    Arranging a damping device (14) in the region of the variable sag (4) at a distance (D) from the storage band (2) that is smaller than the vibration amplitude (A) of expected vibrations (18) of the storage band (2) in the region of the variable Sag (4), and thereby dampening vibrations (18).
  13. A method according to claim 12, characterized in that the arrangement of the damping device (14) comprises carrying the damping device (14) with the variable sag (4) of the storage tape (2).
  14. Method according to claim 13, characterized in that carrying the damping device (14) with the variable sag (4) of the storage tape (2) comprises changing the bend of at least one damping element (20, 22) of the damping device (14).
  15. Method according to one of claims 13 or 14, characterized in that
    the storage belt (2) is guided over two deflection rollers (6) which are arranged at a distance from one another in the conveying direction (F), the variable sag (4) of the storage belt (2) being arranged at least between the two deflection rollers (6), and
    the damping device (14) follows the free variable sag (4) of the storage belt (2), which is defined by the length of the storage belt (2) between the two deflection rollers (6) and the distance between the two deflection rollers (6).
EP18205499.9A 2018-11-09 2018-11-09 Compensation device Pending EP3650595A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP18205499.9A EP3650595A1 (en) 2018-11-09 2018-11-09 Compensation device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18205499.9A EP3650595A1 (en) 2018-11-09 2018-11-09 Compensation device

Publications (1)

Publication Number Publication Date
EP3650595A1 true EP3650595A1 (en) 2020-05-13

Family

ID=64270747

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18205499.9A Pending EP3650595A1 (en) 2018-11-09 2018-11-09 Compensation device

Country Status (1)

Country Link
EP (1) EP3650595A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1643022A1 (en) 2001-04-23 2006-04-05 Autefa Automation GmbH Method for profiling a nonwoven fabric and profile forming device
EP2175056A1 (en) * 2008-10-07 2010-04-14 Oskar Dilo Maschinenfabrik KG Device and method for transferring a non-woven web
WO2014037503A1 (en) * 2012-09-06 2014-03-13 Hi Tech Textile Holding Gmbh Compensating device for fluctuating transport speeds of a fibre nonwoven

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1643022A1 (en) 2001-04-23 2006-04-05 Autefa Automation GmbH Method for profiling a nonwoven fabric and profile forming device
EP2175056A1 (en) * 2008-10-07 2010-04-14 Oskar Dilo Maschinenfabrik KG Device and method for transferring a non-woven web
WO2014037503A1 (en) * 2012-09-06 2014-03-13 Hi Tech Textile Holding Gmbh Compensating device for fluctuating transport speeds of a fibre nonwoven

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