EP3031968B1 - Verfahren zur steuerung einer nadelmaschine - Google Patents

Verfahren zur steuerung einer nadelmaschine Download PDF

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Publication number
EP3031968B1
EP3031968B1 EP15002896.7A EP15002896A EP3031968B1 EP 3031968 B1 EP3031968 B1 EP 3031968B1 EP 15002896 A EP15002896 A EP 15002896A EP 3031968 B1 EP3031968 B1 EP 3031968B1
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EP
European Patent Office
Prior art keywords
take
speed
roll
fibre web
rotation
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.)
Active
Application number
EP15002896.7A
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German (de)
English (en)
French (fr)
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EP3031968A1 (de
Inventor
Hans Joachim Korn
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.)
Truetzschler GmbH and Co KG
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Truetzschler GmbH and Co KG
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Publication of EP3031968A1 publication Critical patent/EP3031968A1/de
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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 method for controlling a needle machine, which has a needle unit with a plurality of needles for needle processing of a nonwoven fabric, wherein the needle unit performs a lifting movement over the nonwoven fabric, so that the needles oscillate retracting into and out of the nonwoven fabric the needling machine has at least one take-off roll, which is downstream of the needle unit in relation to a transport movement of the fiber fleece and initiates a withdrawal force into the fiber fleece, for which purpose a drive unit for rotating drive of the take-off roll is provided and which is controlled by means of a control unit.
  • the invention further relates to a needle machine for carrying out the method and to a control unit for such a needle machine.
  • the WO02 / 068747 A1 describes a needle-punching process for carbon or ceramic fiber plates or sleeves, in which the workpiece to be processed is reduced to zero at the feed rate when the needles are immersed, and then accelerated again. A continuous production of a textile web with front and behind arranged production equipment is therefore not possible.
  • the DE 696 03 706 T2 describes a generic method for controlling a needle machine, and it is proposed to provide the withdrawal speed of the transport movement of the fibrous web via two take-off rolls so that it is synchronized with the periodic lifting movement of the needle unit over the fiber web.
  • the speed of the take-off rolls is reduced and moves the needle unit with the needles from the fiber fleece back out, so the speed of the take-off rolls is increased.
  • the change in the speed of the take-off rollers should be synchronous with the stroke position of the needle unit.
  • the At least the speed of the take-off rolls can precede or lag the position of the needle unit at bottom dead center.
  • the change in the rotational speed is effected by the lifting movement of the needle unit, which is usually predetermined by a crank mechanism, according to a sine function, wherein it is stated that the change of the rotational speed with a modulation can have a variable amplitude up to the receipt of an angular acceleration with the value zero.
  • the object of the invention is the development of a method for controlling a needle machine, the provision of a needle machine and a control unit for this purpose, wherein the method is to cause the lowest possible mechanical stresses in the nonwoven fabric and wherein under minimal mechanical stress on the needle machine, the transport speed of the nonwoven fabric increases and / or a predetermined average value can be maintained.
  • the method according to the invention provides at least the following steps: Determining a limit torque for driving the take-off roll and driving the drive unit by the control unit with a drive torque for driving the take-off roll, which does not exceed the limit torque, so that a torque limit is formed.
  • the core of the invention is first the determination of a limit torque, which is determined and specified for driving the at least one take-off roll. This ensures that the mechanical stresses in the nonwoven fabric do not exceed a limit, since the limitation of the torque to drive the take-off rolls leads to a limitation of a pull-off force in the non-woven fabric.
  • the essence of the invention in connection with the determination of the limit torque continues to drive the drive unit by the control unit with a drive torque for driving the at least one take-off roll, which does not exceed the limit torque.
  • a torque limit is established, and the torque may, for example, move between the theoretical value zero and the limit torque.
  • the speed of the at least one take-off roll is not necessarily maintained at a constant value, since, for example, in a low or in the absence of a retaining force by the intervention of the needles in the nonwoven fabric, the speed of the take-off roll can be increased, and only Upon engagement of the needle unit in the nonwoven fabric retention forces can occur, which allow the drive torque to rise to the limit torque to drive the at least one take-off roll. Only then can the speed of the take-off roll be reduced, wherein the reduction can also be made to the value zero if necessary. Only when the needle unit releases the nonwoven fabric again, the take-off roll can accelerate freely, so engages the limit torque at least over the immersion period during which the needles are retracted into the nonwoven fabric.
  • the take-off rolls may have, by the torque limitation over the immersion period, a speed which induces a tension in the nonwoven fabric which, at least over the period of immersion, may be kept substantially less than or precisely at the corresponding limit torque at a constant value.
  • a stroke sensor provided, wherein by the stroke sensor, a dipping period is detected, over which the needles retract into the nonwoven fabric and by the stroke sensor is detected a freewheeling period during which the needles are moved out of the nonwoven fabric, wherein a sensor signal is output to the control unit and wherein the control unit the drive torque for driving the take-off roller in response to the control signal controls.
  • the driving of the drive unit with the torque limitation is limited to the immersion period.
  • the stroke sensor supplies the sensor signal to the control unit, whereby the control unit has the information as to whether the needles engage in the nonwoven fabric or not.
  • the sensor can for example also be replaced by a rotary encoder, which cooperates with a drive motor in the lifting mechanism and over which the stroke position of the needle unit can be detected accurately enough.
  • the presently described sensor can thus be arranged at any suitable position to determine the stroke position directly or indirectly, and for example, the sensor signal can also be derived from an electronic control signal for controlling the lifting drive, so that in the broadest sense of the present invention also the stroke sensor can form.
  • the torque limiter for driving the drive unit may be limited to the immersion period. Over the freewheeling period, the torque of the drive unit need not necessarily be limited, since the needles do not interfere with the nonwoven fabric and thus can not cause any retention force in the nonwoven fabric. With particular advantage, the driving of the drive unit can take place in the freewheeling period at a predetermined rotational speed for the take-off roll, as explained in more detail below.
  • the predetermination of the speed of the take-off roll in the freewheeling period can be made with particular advantage depending on a determined in the immersion period speed profile of the take-off roll. For example, if the speed profile in the dipping period on a total low speed level, for example, because the retention force by the needles in the fiber fleece fails high and thus engages the torque limiter early, so in the freewheeling period, the speed of the take-off roll can be predetermined so that the very low speed of Take-off roller is caught up in the dipping period.
  • the lag of the fiber fleece in its transport movement can be made up by an increase in the rotational speed over the freewheeling period, ie if no needles engage in the fiber fleece.
  • an average transport speed of the fibrous web in the transport movement can be predetermined, and the predetermination of the rotational speed for the take-off roll over the freewheeling period can additionally be carried out by the predetermined mean transport speed of the fiber web at least over one and preferably over several Stroke cycles consisting of the immersion period and the freewheeling period is maintained.
  • the average transport speed is particularly important when the needle machine is operated in the composite of several processing machines for pre and post-processing of the fiber web.
  • the needle machine is usually downstream of a funnellegestation and upstream of a removal station, and thus may be part of a nonwoven system.
  • the composite of the needle machine between upstream and downstream stations results in a predetermined average of the total material flow velocity of the nonwoven material Transport speed, which must be maintained for a trouble-free operation in order not to negatively influence the upstream and downstream processes.
  • the average transport speed can also change over the processing time, so that the method receives the average transport speed via the control module as at least one further reference variable.
  • the predetermination of the rotational speed for the take-off roll over the freewheeling period can additionally be carried out in that the predetermined average transport speed of the fiber web is maintained at least over one and preferably over a plurality of lifting cycles.
  • the method may be operated by the construction of a control loop via the control unit, and the control unit may comprise a drive module and a control module for forming the control loop, wherein the control loop can be operated with: a reference variable, formed by the predetermined average transport speed, a controlled variable, formed by a control signal, which is output to the drive module and a disturbance derived from the speed profile of the take-off rolls over the immersion period.
  • a control deviation can be determined by the control unit and the control signal can be output so that a change in the speed of the take-off rolls in the dipping period causes this adjustment compensating adjustment of the speed of the take-off rolls in the freewheeling period.
  • the drive unit may have at least one motor and a rotary encoder, wherein the rotary encoder detects the rotational speed of the motor and outputs a feedback signal to the control unit and in particular to the control module.
  • the invention further relates to a needle machine for needle processing of a nonwoven fabric with a needle unit having a plurality of needles, wherein the needle unit is designed to perform a lifting movement over the nonwoven fabric, so that the needles are retractable retractable into the nonwoven fabric and out of this again, and with at least one take-off roll, which is arranged downstream with respect to a transport movement of the fiber web of the needle unit and serves to initiate a withdrawal force into the non-woven fabric, for which a drive unit for rotating drive of the take-off roll is provided and which can be controlled by means of a control unit, wherein the needle machine is formed is to carry out the prescribed procedure.
  • control unit for a needle machine as described above, in order to carry out the method according to the invention.
  • the control unit may comprise at least: a drive module and a control module for forming a control loop, wherein the control loop is operable by a reference variable, formed by the predetermined average transport speed, a controlled variable, formed by a control signal, which is output to the drive module and a Disturbance, derived from the speed profile of the take-off rolls over the immersion period, so that a control deviation can be determined by the control unit and the control signal can be output so that a change in the speed of the take-off rolls in the dipping period a change compensating this adjustment of the speed of the take-off rolls in the freewheeling period is effected ,
  • FIG. 1 shows a schematic view of a needle machine 1 for carrying out the method according to the invention.
  • the needling machine 1 serves to solidify a fiber web 100, which is moved through the needle machine 1 with a transport movement x, represented by an arrow.
  • the movement in the non-woven fabric 100 is generated by two opposing draw-off rollers 12, wherein by way of example a take-off roller 12 is driven by a motor 19.
  • the take-off rolls 12 are preceded by a needle unit 10 with a multiplicity of needles 11, and the needle unit 10 can be moved up and down with a lifting mechanism 22 in a vertical direction with respect to the plane of extent of the fiber fleece 100.
  • the up and down movement takes place over successive lifting cycles, which are subdivided into an immersion period te, in which the needles 11 into the non-woven fabric 100 immersed, characterized by a penetration depth se, and in a freewheeling period te, in which the needles 11 are out of engagement with the nonwoven 100, see enlargement of a corresponding sensor signal 16, which is output by a stroke sensor 15 for detecting the lifting movement.
  • a stitch plate 21 is shown, over which the fiber fleece 100 is moved away and allows the passage.
  • the control unit 14 comprises a drive module 17 and a control module 18, wherein the drive module 17 primarily serves to control the speed and in particular a torque of the motor 19, for which the motor 19 is coupled to a rotary encoder 20.
  • the rotary encoder 20 transmits a feedback signal Rk to the drive module 17.
  • the feedback signal Rk can be continued by the drive module 17 to the control module 18, wherein the control module 18 to the drive module 17 outputs a correspondingly determined control signal R.
  • the stroke sensor 15 for detecting the stroke position of the needle unit 10 outputs the sensor signal 16 to the control module 18, and the sensor signal 16 provides the control module 18 with the information as to whether the needle unit 10 is in the dipping period te or in the freewheeling period tf.
  • a mean transport speed vt_m As a reference variable for the control of the needle machine 1 is a mean transport speed vt_m, which is output as a signal to the control module 18.
  • the mean transport speed vt_m results from an integration of the needle machine 1 in the composite of a nonwoven system, and the average transport speed vt_m must be maintained as accurately as possible for trouble-free operation of the nonwoven system.
  • the control module 18 taking into account the sensor signal 16 from the stroke sensor 15 from a control variable to the drive module 17, which is formed by a control signal R.
  • the difference between a speed value of the feedback signal Rk and the control signal R results in a disturbance, which is derived from the Speed profile of the take-off rolls 12 over the immersion period te.
  • the motor 19 and thus the take-off roller 12 is torque-controlled, such that the torque does not exceed a predetermined limit torque.
  • This damage to the needles 11 is avoided because the withdrawal force in the fiber web 100 is limited by a limited torque in the take-off rolls 12.
  • the torque limitation is provided only over the immersion period te, since only then damage to the needles 11 can be caused. If the needle unit 10 is above the freewheeling period tf, predetermined by the sensor signal 16 of the stroke sensor 15 to the control module 18, then the rotational speed over the freewheeling period tf can be adjusted in such a way that the deviation from the feedback signal Rk is dependent on the magnitude of the control signal R mean transport speed vt_m for the fiber web 100 results.
  • the limit torque flow u.a. the values fleece weight, fleece width, transport speed, speed delay between inlet and outlet of the needle machine, the drive power and the torque of the motor without material.
  • FIGS. 2 and 3 show different compensation curves K1 and K2 a speed curve D of the take-off rolls 12, from which directly a transport speed v (x) can be derived.
  • the mean velocity value of the transport speed v (x) of the Transporting movement x over time t can be divided into the dipping period te and the free running period tf, where both periods together represent the lifting cycle T of the movement in the needle unit 10.
  • the speed of the nonwoven 100 may have a constant minimum value, which may also be zero. If the needles 11 are again disengaged from the fiber web 100 and start the freewheeling period tf, then a compensation course K1 can be set therein, which sets a speed of the fiber web 100 by a corresponding speed in the draw-off roller 12 such that the average speed of the fiber web 100 corresponds to the predetermined mean transport speed vt_m.
  • the speed profile D of the transport speed v (x) of the nonwoven fabric 100 according to FIG. 2 shows over the immersion period te compared to the velocity course D of FIG. 3 a greater value. In the course, the example with FIG.
  • the retention force by the needles 11 in operative connection with the non-woven fabric 100 may be less than that shown in the speed curve D shown in FIG. 3 , because the velocity profile D of the transport velocity v (x) in FIG. 3 has lower values over the immersion period.
  • the control signal R can be output to the drive module 17 via the control loop with the control module 18 taking into account a compensation curve K1, K2. Due to the lower reduction of the transport speed v (x) in the velocity course D according to the example in FIG. 2 falls the compensation curve K1 in FIG. 2 less than the compensation curve K2 in the example of FIG.
  • the control loop regulates the speed over the freewheeling period tf taking into account the reference variable, formed by the required mean transport speed vt_m, such that the average transport speed vt_m is established while forming the compensation curves K1 and K2.
  • the higher or lower velocity profile D of the fiber web 100 may be dependent, for example, on the precompression of the fiber web 100, the thickness of the needles 11 or the depth of penetration of the needles 11, the transport speed v (x) over the immersion period te occurring via a torque limitation. If the take-off rolls 12 reach a limit torque, the control unit 14 lowers the speed of the take-off roll 12 such that the limit torque is not exceeded.
  • the compensation curve K1 or K2 can be adjusted by the control loop 18 in the control module 18 so that Finally, the average transport speed vt_m sets.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Nonwoven Fabrics (AREA)
EP15002896.7A 2014-12-11 2015-10-09 Verfahren zur steuerung einer nadelmaschine Active EP3031968B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102014118385.1A DE102014118385A1 (de) 2014-12-11 2014-12-11 Verfahren zur Steuerung einer Nadelmaschine

Publications (2)

Publication Number Publication Date
EP3031968A1 EP3031968A1 (de) 2016-06-15
EP3031968B1 true EP3031968B1 (de) 2017-09-13

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Application Number Title Priority Date Filing Date
EP15002896.7A Active EP3031968B1 (de) 2014-12-11 2015-10-09 Verfahren zur steuerung einer nadelmaschine

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EP (1) EP3031968B1 (zh)
CN (1) CN105696202B (zh)
DE (1) DE102014118385A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108085874A (zh) * 2017-12-23 2018-05-29 汕头三辉无纺机械厂有限公司 实时针刺轨迹模拟系统

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107435187B (zh) * 2017-07-25 2019-05-28 常州大学 等静压联动三维针刺编织机
US11655870B2 (en) * 2019-10-08 2023-05-23 Honeywell International Inc. Method for manufacturing composite fiber preform for disc brakes

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Publication number Priority date Publication date Assignee Title
FR2729404B1 (fr) 1995-01-12 1997-04-11 Asselin Aiguilleteuse et procede de commande d'avance associe
FR2729977B1 (fr) * 1995-01-26 1997-04-25 Asselin Procede d'adaptation du pas d'une aiguilleteuse, et aiguilleteuse mettant en oeuvre ce procede
JPH08260332A (ja) * 1995-03-20 1996-10-08 Okuma Mach Works Ltd 不織布製造機の間欠送り装置
WO2002068747A1 (fr) * 2001-02-26 2002-09-06 Messier-Bugatti Procede et dispositif de commande d'avance de plaque fibreuse aiguilletee.
US6568050B2 (en) * 2001-02-26 2003-05-27 Messier-Bugatti Method and installation for advancing a needled fiber plate
CN100491621C (zh) * 2007-03-17 2009-05-27 江苏省仪征市海润纺织机械有限公司 针刺非织造材料均匀针迹的生产方法及装置
CN202809186U (zh) * 2012-08-17 2013-03-20 苏州希尔克新材料有限公司 一种用于打褶机的耐高温毛毯套筒的加工设备

Non-Patent Citations (1)

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Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108085874A (zh) * 2017-12-23 2018-05-29 汕头三辉无纺机械厂有限公司 实时针刺轨迹模拟系统

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Publication number Publication date
CN105696202B (zh) 2018-08-17
CN105696202A (zh) 2016-06-22
DE102014118385A1 (de) 2016-06-16
EP3031968A1 (de) 2016-06-15

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