WO2002016683A2 - Verfahren zum betreiben eines streckwerks sowie streckwerk - Google Patents
Verfahren zum betreiben eines streckwerks sowie streckwerk Download PDFInfo
- Publication number
- WO2002016683A2 WO2002016683A2 PCT/EP2001/009543 EP0109543W WO0216683A2 WO 2002016683 A2 WO2002016683 A2 WO 2002016683A2 EP 0109543 W EP0109543 W EP 0109543W WO 0216683 A2 WO0216683 A2 WO 0216683A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- drafting
- nonwoven fabric
- rollers
- roller
- forces
- Prior art date
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- 238000000034 method Methods 0.000 title claims description 40
- 239000000835 fiber Substances 0.000 claims abstract description 76
- 239000004745 nonwoven fabric Substances 0.000 claims abstract description 66
- 238000005259 measurement Methods 0.000 claims description 42
- 230000006835 compression Effects 0.000 claims description 17
- 238000007906 compression Methods 0.000 claims description 17
- 230000001105 regulatory effect Effects 0.000 claims description 15
- 238000011156 evaluation Methods 0.000 claims description 14
- 238000012937 correction Methods 0.000 claims description 12
- 239000012530 fluid Substances 0.000 claims description 11
- 238000006073 displacement reaction Methods 0.000 claims description 6
- 230000001965 increasing effect Effects 0.000 claims description 5
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 2
- 238000009987 spinning Methods 0.000 claims 1
- 239000004753 textile Substances 0.000 abstract description 2
- 230000006978 adaptation Effects 0.000 abstract 1
- 230000008859 change Effects 0.000 description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 239000007921 spray Substances 0.000 description 7
- 238000005507 spraying Methods 0.000 description 6
- 238000005452 bending Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000032258 transport Effects 0.000 description 2
- 235000013290 Sagittaria latifolia Nutrition 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 230000006399 behavior Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 235000015246 common arrowhead Nutrition 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
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- 230000000717 retained effect Effects 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01H—SPINNING OR TWISTING
- D01H13/00—Other common constructional features, details or accessories
- D01H13/14—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements
- D01H13/22—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements responsive to presence of irregularities in running material
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01H—SPINNING OR TWISTING
- D01H1/00—Spinning or twisting machines in which the product is wound-up continuously
- D01H1/14—Details
- D01H1/20—Driving or stopping arrangements
- D01H1/22—Driving or stopping arrangements for rollers of drafting machines; Roller speed control
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01H—SPINNING OR TWISTING
- D01H5/00—Drafting machines or arrangements ; Threading of roving into drafting machine
- D01H5/18—Drafting machines or arrangements without fallers or like pinned bars
- D01H5/32—Regulating or varying draft
- D01H5/38—Regulating or varying draft in response to irregularities in material ; Measuring irregularities
Definitions
- the invention relates to methods for operating a drafting system.
- the invention also relates to corresponding drafting systems.
- the centerpiece of a route is the drafting system.
- One or more textile fiber tapes are presented to the drafting system in the form of a non-woven fabric, in which this non-woven fabric is then warped.
- the nonwoven fabric spreads, which is formed into a last fiber sliver again after leaving the last warping zone.
- the amount of warpage has to be adapted to the sliver material, whereby the stack length is an important material parameter.
- the drafting system is formed by a number of pairs of rollers, which are arranged one behind the other and form the distortion fields.
- Usual drafting systems usually have a pre-default field and a main default field.
- both the pre-delay and the main delay are constant during the delay process.
- regulated routes are compensated by changing the amount of delay.
- both the forward and the main draft can be influenced, but the main draft is almost always chosen. The reason is that the main delay is greater than the previous delay, so that more precise regulation can be made.
- both unregulated and regulated sections there is a need to obtain information about the warpage quality of the warped nonwoven.
- a frequently used measuring element in the intake of a drafting system consists of a pair of sensing rollers, one of the two sensing rollers being movably mounted and being more or less deflected by the fluctuations in mass of the incoming belts.
- the deflection movements are converted into electrical voltage values by a signal converter and passed on to a regulation processor.
- the latter forms a setpoint for a gearbox which is connected to one or more rollers of the drafting system. Since the nonwoven fabric formed in the measuring element has to travel a certain distance between the measuring location and the delay location, the signal must be retained in a memory up to this point in time.
- the continuous fiber volume is also determined for measurements in the outlet area.
- capacitive measuring devices are known which make use of the high dielectric constant of water carried with the nonwoven fabric.
- the quality of the warped nonwoven is checked, for example, by separating individual sections from the nonwoven and weighing them.
- corresponding parameters on the drafting system are then changed, for example the distance between the pairs of drafting system rollers and / or the rotational speed of individual rollers.
- various methods have become known for measuring the distortion forces arising between the fibers of a nonwoven fabric to be drawn. For example, from DE 1 141 212 and the publication "Comparative Investigations on Measuring Devices for Continuous Determination of Material Unevenness" by W. Wegener and H.
- DE 1 062 587 it is known from DE 1 062 587 that the distortion force occurring between two pairs of rollers slightly deflects a support arm which can be pivoted about a pivot point.
- the downstream pair of rollers is mounted on the lever end of the support arm and is deflected by a further subsequent pair of rollers at a constant take-off speed of the sliver - with correspondingly large distortion forces.
- the corresponding deflection of the support arm is then measured using a transducer.
- DE 1 062 587 it is also known to measure a draft force component between two pairs of rollers by means of a small roller which deflects the nonwoven fabric and which is supported in balls on both sides and is supported on one side by a toggle lever and on the other side by a corresponding support becomes.
- the deflections of the roll are in turn converted into an electrical voltage change.
- FR 1 324 756 describes how to compensate for very short-term fluctuations in the fiber mass and thus the drafting forces in that the input rollers (or another pair of rollers) are shifted in or against the direction of travel of the belt. As a result of the pair of rolls being shifted, the warpage is reduced or increased.
- the pair of delivery rollers is supported on two spring bars. Fluctuations in the draft force cause the delivery roller bearing to deflect slightly. These deflections are registered with the aid of an inductive or capacitive measuring device. The measurement signals are then used to change the stretching field width as indicated.
- the expression “directly and / or indirectly” is to be understood to mean that variables other than the drafting force can also be measured, but these allow a conclusion to be drawn about the drafting forces.
- the advantages of the invention can be seen in particular in the fact that various new methods and devices for optimizing the drafting system settings are presented. Furthermore, new methods of measuring the warpage force are introduced, whereby additional measurements regarding a volume flow of the nonwoven fabric can be carried out if necessary.
- the measurement of the friction between fibers of a nonwoven fabric is carried out by direct and / or indirect measurement of the drafting forces. The stronger the fibers of the nonwoven are connected, the higher the fiber friction, the higher the warping forces.
- the determination of the distortion forces can therefore be used to draw conclusions about the quality and arrangement of the fibers in the nonwoven fabric, and the drafting system parameters can be adjusted accordingly accordingly.
- the distortion forces can be determined once, continuously or at predetermined or random time intervals.
- the measured drafting forces it is possible to use the measured drafting forces to determine whether the fiber sliver to be drawn has a large proportion of parallel fibers with a correspondingly lower friction or a larger proportion of fibers lying transversely, which due to the mutual intertwining with neighboring fibers only pull apart with greater forces can be.
- investors i.e. the hand-made connection of two consecutive supply tapes is determined and removed from the warped fiber fleece if the interlacing is too large or too small.
- a method for measuring the draft force is distinguished by the fact that the top roller of the upstream pair of rollers, for example the pair of center rollers when the main draft is observed, is deflectably mounted, while the associated bottom roller is stationary in these measurements.
- the top roller is expediently on a concentrically extending around the bottom roller circumferential surface Circular path section movable. In the event of large warping forces, the top roller shifts in the downstream direction, and the distance can be converted into electrical voltage signal changes in a known manner using a displacement measuring element. These are then characteristic of the effective drafting forces.
- the measured values of the draft force measurements can be used according to the invention for setting further drafting system parameters.
- a stretching field width setting is to be explained: If the average fiber length is too great, for example, in relation to the distance between the drafting rollers, there is a more frequent clamping of the fibers between the two pairs of rollers in question. Optimal distortion cannot then be guaranteed because the clamped fibers tear due to the different roller speeds. The warping force that acts on these clamped fibers is accordingly high. If such a high warping force is measured, this could be an indication of increasing the distance between the two pairs of rollers. For this purpose, it is not necessary to measure the level of the distortion forces exactly in all cases.
- the optimized positioning of a push rod in a warping field can be carried out by manually adjusting the push rod in the horizontal and / or vertical direction if an operator takes appropriate information from the measured warping forces.
- the warping forces are very low in comparison to empirical values with otherwise almost the same fiber quality and the same roller spacings, and the warping would be faulty if the top roller pressure were too low.
- This can then be set either manually or automatically with the help of an appropriate control.
- an automatic setting it could be determined within a very short time whether the top roller pressure actually represents the source of the error. If this is not the case, since the distortion force measurement does not determine any changes in the distortion forces, the original roller pressure can be automatically set again and another drafting system parameter - preferably manually or automatically - can be varied in order to find the cause of the error. In the case of a fully automatic drafting unit, the problem can be determined and eliminated very quickly in this way.
- the spread of the nonwoven fabric in front of the drafting system can also be varied according to the invention on the basis of the measurement of the draft force.
- the nonwoven fabric By means of appropriately profiled guide rods, in particular bent transversely to the nonwoven fabric, directly in front of the drafting device entrance, the nonwoven fabric can, for example, be spread out more and thus the fiber-fiber contact may be reduced. In the best case, this has an effect on the measurement of low distortion forces.
- the measured values or correction values derived therefrom are used for setting the control starting point in a delay field of a control section.
- the fibers in the former sections are warped at a later point in time or closer to the downstream drafting roller pair than the latter sliver sections. It therefore makes sense to change the control starting point, which is a measure of the point in time of the change in the roller speed to compensate for strip unevenness, on the basis of the measurement results from the distortion force measurements. If high warping forces are measured due to thick spots, for example, the standard point of use should be brought forward so that these sliver sections with their large sliver cross-section are warped accordingly at the same position in the warping area as the sliver sections with a smaller cross-section.
- the distortion forces are measured directly by the force absorption of a measuring element deflecting the nonwoven fabric between two roller pairs of the drafting system.
- a pressure rod that is usually in the main draft zone, ie between the pair of central rollers and the bed. ferwalzencru, is arranged.
- Such a pressure bar is usually in contact with the nonwoven fabric over the width of the main drafting area and deflects the nonwoven fabric between the two clamping lines of the main drafting area. The deflection of the nonwoven fabric gives the pressure rod a force component perpendicular to the connecting plane between the two clamping lines of the two pairs of rollers in question.
- strain gauges can be used, which respond to a bend in the pressure rod section connected to the nonwoven fabric and deliver a signal proportional to the component of the draft force.
- the bending beam principle is particularly useful here.
- the bending beam as part of the compression rod is arranged transversely to the direction of distortion in the distortion field and represents the measuring element. If the compression rod is loaded by a force, it is subjected to bending, the bending leading to expansion or compression. It is advisable, for example, to mount the compression rod in such a way that such expansion or compression takes place in particular on the end faces of the compression rod.
- strain gauges which can be glued to the flanks and convert the expansion or compression into electrical signals.
- the strain gauges are preferably arranged in such a way that their expansion or compression is greatest when the force acting on the compression rod is perpendicular to the distortion field
- the pressure rod is designed as a displacement measuring element, which is deflected from its rest position due to the drafting forces of the nonwoven fabric acting on it. The size of the deflection is converted into an electrical signal which is proportional to the tensile forces acting on the compression rod.
- the arrangement of the compression rod in the draft zone is advantageously provided in such a way that the tion plane between the two clamping lines of the two pairs of rollers concerned vertical force component is measured.
- the pressure rod is suitably movably mounted perpendicular to the connection plane mentioned.
- the torques or torque changes occurring on the drafting system rollers can be measured on the basis of the distortion forces acting on the rollers.
- the torque is known to be related to the warping force over the radius, measured from the axis of rotation of the roll in question to the point of application of the warping forces.
- the method of torque measurement therefore represents an indirect measurement of the distortion forces.
- Known torque measuring devices can in particular also be used to determine the torque or to estimate its amount.
- strain gauges are glued to the outer walls of one or more rollers in such a way that when torsional stress occurs, two of them are stretched and the others are compressed. The resulting change in resistance can then expediently be converted into an electrical voltage which is proportional to the torque with the aid of a measuring bridge. If one also measures the speed of the roller (s), the mechanical power transmitted by the shaft can also be determined, which is proportional to the product of torque and speed.
- Other torque sensors that can also be used work inductively or use the magnetoelastic principle.
- the torque of only one or more drafting rollers can be measured. To determine whether a certain threshold value of the torque and thus the distortion forces is exceeded, in in many cases, only the measurement on a roller. More precise measurements can be achieved if the torque absorption of the rollers between which the nonwoven fabric is drawn is measured at the same time. For the most precise statements, the torques of all driven rollers or rollers that move along by friction would have to be measured for a section with a pre-drafting field and a main drafting field.
- the distortion forces can be measured indirectly by the power consumption of a motor which serves to drive at least one drafting device roller or which influences such a drive.
- a motor which serves to drive at least one drafting device roller or which influences such a drive.
- the power of the motor driving the delivery roller can be measured, for example.
- the magnitude of the distortion forces can be at least estimated from this, or the exceeding of a previously set threshold value, for example based on empirical values, can be determined.
- the power consumption of the motor driving the central roller is measured accordingly. The choice of which motor the power consumption should be measured depends on e.g. depends on whether the advance delay or the main delay distance is greater. If the latter is the case, longer fibers are rather clamped on both sides in the draft zone, so that the power consumption of the motor driving the center rollers is correspondingly large and is more suitable for measurement.
- a corresponding measurement of the power consumption of the motor is of course also possible.
- Regulated lines are known in which a main motor drives the delivery roller on the one hand and is operatively connected to a planetary gear which acts on the center roller.
- the planetary gear receives a control speed of a servo drive, which receives a setpoint from a regulation processor, for example.
- the setpoint is formed by electrical signal values from a pair of feeler rollers located at the inlet and the delivery speed of the line. It is now possible to determine the power consumption of the main motor and / or the servo motor, the power being a measure of the warping forces acting on the nonwoven fabric.
- the drafting forces act - as explained above - on the drafting rollers, which in turn emit corresponding torques to the main motor or, via the planetary gear, to the servo motor and the main motor.
- a measure of the distortion forces can then be determined from this with the aid of known physical dependencies.
- the total forces acting on a drive train are measured, the drive train being designed to transmit power from a drive motor to at least one drafting roller. Fluctuations in the measured forces - taking into account the forces acting on the motor - are due in particular to the distortion forces acting on the nonwoven fabric.
- the drafting forces are according to the invention from a comparison of the drive torques with and without in the drafting system fiber fleece located calculated.
- the measured values are evaluated by means of an evaluation unit and correction values are determined. Using the evaluation unit, it is particularly advantageously possible to evaluate the mean value and variation of the warping forces in the nonwoven fabric.
- the measurement and / or correction values can then be displayed, for example, on the machine or by means of data transmission at a more distant control point.
- drafting unit parameters can then be changed manually, for example.
- the measured values can also be used directly to reset one or more parameters, experience values relating to the meaning of the measured values, for example using tables, being available, for example.
- results of the measurements and / or the corrections can advantageously also be shown merely in the form of a yes / no display, for example if only the undershoot or overshoot of a threshold value (maximum and / or minimum) is to be displayed.
- a threshold value maximum and / or minimum
- an acoustic and / or optical signal is suitable for this.
- the measured values and / or correction values derived therefrom from distortion force measurements are stored in an electronic memory in order to obtain information about the quality of the nonwoven fabric produced at a later point in time.
- Information on the properties of yarns produced from the nonwoven (yarn strengths, 7) can also be obtained from the nonwoven data.
- the draft force measurement can be used as an alternative or in addition to the known regulating methods and devices.
- the above-described off- and / or on-line settings of the drafting system on the basis of the measured draft force values can be complemented by measurement results obtained at the output of the drafting system by appropriate measuring instruments, for example the Rieter Quality Monitor provided on the RSB-D30 line.
- appropriate measuring instruments for example the Rieter Quality Monitor provided on the RSB-D30 line.
- a large data pool is then available, which allows, for example, a high-precision online regulation to be ensured after appropriate evaluation.
- the operator can be given recommendations as to how optimization of the drafting device parameter settings can be achieved off-line.
- the optimization of the setting of drafting system parameters by means of the invention is particularly recommended when fiber properties change significantly.
- These characteristic values include, for example, the fiber length, the length uniformity (stack length), twists in the fiber structure, the fiber fineness, the short fiber content, fiber masses in cross-section, the order or the parallel position of the fibers, the cross-sectional shape and the compactness of the fiber fleece, the fiber adhesion, the foreign fiber content and / or the fiber moisture.
- the invention can be used particularly advantageously when warping fiber blends.
- the mixture combinations can be monitored and fiber bundles can be identified that form in the drafting system at certain warping distances.
- blends - but also in the case of unmixed feeding of tapes - it is particularly advisable to draw conclusions about the CV value of the nonwoven fabric or to calculate it from the draft force measurements.
- at least one fluid for changing the fiber friction in the nonwoven fabric is introduced into the stretching field.
- the introduction by means of spraying for example with a spraying device arranged above the relevant distortion field, is appropriate, one or more spraying nozzles being directed at the nonwoven fabric to be drawn.
- an air humidifier into the stretching field (preliminary and / or main drafting field) in order to reduce the friction between the fibers.
- water in sufficient amounts in the form of small droplets, e.g. Water vapor.
- a moistening agent based on an oil / water can advantageously be introduced into the stretching field, which reduces the mutual adhesion of the fibers and facilitates the warping.
- a fluid is applied to the nonwoven fabric in front of the drafting device in order to reduce the fiber friction.
- the already stretched nonwoven fabric is sprayed with water or steam at the exit of the drafting system, since water - if not used in too large amounts - increases the fiber friction and thus ensures sufficient cohesion of the nonwoven fabric for, for example, trouble-free entry on a flyer.
- any other suitable fluid can be used to increase fiber friction.
- Figure 1 is a schematic representation of the essential components of a known drafting system
- Figure 2 is a schematic representation of the drafting system according to Figure 1 with additional torque transducers.
- FIG. 3 shows a schematic illustration of the drafting arrangement according to FIG. 1 with additional motor power absorbers
- Figure 4 is a schematic side view of the middle and delivery rolls of a drafting system with a pivot bearing for the middle top roll;
- Figure 5 is a schematic side view of the rollers of a drafting system with four top rollers and three bottom rollers and a pressure rod, and
- Figure 6 is a schematic side view of the rollers of a drafting system with a spray device.
- Figure 1 shows schematically a known drafting system 1 of a line with an electronic control system.
- the essential elements of the drafting system 1 are three pairs of rollers, of which only the respective upper rollers, namely the upper input roller 2, the upper central roller 3 and the upper delivery roller 4, are shown in the view of FIG. 1.
- the Inlet rollers 2, 5 and the middle rollers 3, 6 form a pre-drafting zone 10 between them and the center rollers 3, 6 and the delivery rollers 4, 7 form a main drafting zone 11.
- a fleece funnel 16 is provided, followed by a pair of draw-off rollers 15, which transports the warped fiber fleece FV, for example, to a can via corresponding guide passages (not shown). Furthermore, a deflection roller (not shown) can be provided between the pair of delivery rollers and the pair of take-off rollers 15.
- a pair of sensing rollers 14 is arranged, which in the present case is designed as a pair of grooved keys.
- a funnel 13 Upstream of the pair of feeler rollers 14 is a funnel 13, which serves to bring together the supply belts VB entering the pair of feeler rollers 14.
- six supply belts VB are fed side by side to the hopper 13, compressed therein and sent through the pair of sensing rollers 14.
- Downstream of the pair of feeler rollers 14 one speaks of a now compact fiber fleece FV instead of supply belts VB.
- FIGS. 1 to 3 have a colored arrowhead.
- the mechanical connections are shown as lines with an arrow head only rimmed.
- One of the two feeler rollers 14 is movably mounted and is deflected by the moving belts VB due to their fluctuations in mass, depending on the size of these fluctuations.
- the deflection movements are converted into electrical voltage signals in a signal converter 34 and forwarded to an evaluation and regulating unit 33.
- the task of the evaluation and regulating unit 33 is to use the electrical signal values of the incoming supply belts VB and the delivery speed of the To form the correct setpoint for a servo drive 32, which generates a control speed for a planetary gear 31 from this setpoint.
- the drafting device feed formed by the lower input roller 5 and the lower center roller 6, is driven.
- the main speed is given to the planetary gear 31 by a main motor 30.
- the main motor 30 also serves to drive the lower delivery roller 7, which thus ensures a constant delivery speed of the outflowing nonwoven fabric FV.
- the section according to FIG. 2 has additional devices with which the distortion forces acting on the nonwoven fabric FV can be measured indirectly.
- the torques from the upper or the lower middle and delivery rollers 3, 4, 5, 6 are measured.
- the measuring devices 35, 37 which can be formed, for example, by strain gauges glued to the roller surfaces.
- the resulting signals of the changes in resistance can then be converted with a measuring bridge 36, 38 (the signal converters) into electrical voltages that are proportional to the torque.
- the electrical signals are passed on from the measuring bridges 36, 38 to the evaluation and regulating unit 33, which evaluates these signals, determines the setpoint - as previously stated for the known route - and this setpoint to the Servo drive 32 passes on.
- the torques of the rollers after signal conversion are alternatively or additionally displayed on a display device, for example to let an operator know that manual adjustments to the drafting system 1 are to be made.
- These changes can include, for example: pressure, the top roller hardness, the distance between the roller pairs and / or the position of a (not shown) pressure rod in the stretching field.
- the display device can have, for example, an optical and / or acoustic alarm function.
- the display device can furthermore preferably be activated if the torques or the drafting forces exceed a threshold value.
- the warping forces or falling below or exceeding predetermined limit values are preferably indicated acoustically and / or optically, so that an operator manually makes settings, for example of the stretching field width or the top roller pressure.
- a power sensor 40 for the main motor 30 and on the other hand a power sensor 42 for the servo drive 32 is provided.
- These measuring instruments 40, 42 measure the power that the respective motor 30 or 32 must exert in order to obtain the required delay. If the fibers adhere very strongly to one another, for example, the corresponding motor 30 or 32 must exert a greater power, which is measured by the assigned power sensor 40 or 42 and is proportional to the distortion forces to be applied.
- the measurement signals are measured and displayed by the power sensors 40 and 42, respectively. An operator is informed that a manual change of drafting system parameters is necessary, for example because a new batch of fiber slivers to be drawn has changed fiber characteristics.
- the signals from one or both power sensors 40, 42 are fed into the evaluating and regulating unit 33, which then also, for example, extends the stretching field of the advance and / or the main delay 10, 11 adapts, i.e. sets new values for the roller pair spacing and initiates an automatic setting.
- the power consumption is relatively low or relatively high, for example in the form of concrete data or by a signal when a threshold value is exceeded or not reached.
- an operator can manually - for example on the basis of a table with listed draft forces on the one hand and possible changes in the setting of drafting system parameters on the other hand - make a change in, for example, the top roller pressure or the horizontal and / or vertical position of a compression rod in one of the draft fields.
- a similar procedure can be used if the spreading of the nonwoven fabric between the input rollers 2, 5, that is to say in front of the drafting system, and the pair of sensing rollers 14 is to be changed by means of a guide element for the nonwoven fabric (not shown). This can be done either by a compacting or a guiding element that spreads the nonwoven fabric.
- guide elements are state of the art and are usually placed in front of the drafting system. According to the invention, at least one guide element is exchanged for another with a different contour in order to achieve the desired fiber cross-sectional geometry and thus a different behavior in relation to warping force.
- FIG. 4 shows the pair of central rollers 3, 6 and the pair of delivery rollers 4, 7 of a drafting system with nonwoven fabric FV running from right to left.
- a compression rod 20 for deflecting the fiber fleece FV is arranged in the draft zone 11 spanned by the pairs of rollers.
- the top roller 3 of the middle pair of rollers is pivotally mounted on a pivot arm 61 which can rotate about a pivot axis D.
- the pivot axis D runs here at through the axis of the lower roller 6, so that the upper roller moves when pivoting on a circular path running in the circumferential direction of the lower roller 6.
- a measuring device 63 is connected to a lever 62 which is connected to the swivel arm 61 and is designed, for example, as a known displacement measuring device with a resistance or voltage change conversion and is based, for example, on capacitive, piezoelectric or similar principles.
- the warping force exerted by the nonwoven fabric FV is used in this device to deflect the upper roller 3 in a plane in the shape of a segment of a circle, whereby an adjustable leaf or tension spring acting on the swivel arm 61 and acting against the warping force is provided for adjusting the roller center position.
- Pneumatic or hydraulic setting elements can also be implemented.
- the drafting system 1 shown in side view has four upper rollers 2, 3, 4, 8 and three lower rollers 5, 6, 7.
- the input roller pair 2, 5 and the middle roller pair 3, 6 form a Vorverzug ⁇ feld and the middle roller pair 3, 6 and the delivery roller pair 4, 7 a main drafting field 11.
- the roller 8 represents a deflection roller.
- a pressure rod 20 is arranged, which in the extends essentially over the entire width of the stretching area of the main drafting area 11 and serves to deflect the fiber fleece FV, which is moved from left to right in this embodiment. This increases the friction between the fibers.
- relatively short fibers are guided by means of the pressure rod 20 and "float" to a lesser extent.
- the pressure rod 20 is mounted so as to be movable substantially perpendicular to the two clamping lines of the middle and delivery roller pairs 3, 6 and 4, 7.
- the pressure rod 20 is designed as a displacement transducer for force measurement, the amount of deflection being proportional to the force acting on it.
- the pressure rod 20 is arranged in a stationary manner and is provided with a plurality of strain gauges which are stretched or compressed in a known manner when force is applied and thereby change their resistance. These changes in resistance are then e.g. convertible into electrical voltage signals by means of a bridge circuit, which can then be used to infer the distortion forces.
- the pressure rod 20 can be used, in particular, to infer moisture fluctuations in the fiber fleece FV. It is assumed here that the fiber properties of a batch of material to be warped remain largely constant. If larger fluctuations in the warping forces are measured under otherwise identical conditions (e.g. also via torque or power consumption measurements), this can be an indication that the moisture content in the supply belts VB fluctuates and that certain sections of the warped fiber fleece may not meet high quality requirements , By means of the invention it is thus possible to remedy such deficiencies of the reference tapes by e.g. be removed from the warped fiber fleece FV.
- the signal is passed on from the pressure rod 20, which is designed as a displacement measuring element, to a signal converter 21, which generates the corresponding voltage signal and forwards it to a display 22.
- the operating personnel can make changes to the drafting system settings, for example also to the position of the pressure rod 20 in the main drafting zone 11.
- Such changes in position can affect the distance to a pair of rollers 2, 5 or 3, 7 and / or the depth the the print rod 20 immersed in the main drafting zone 11.
- the voltage signal is forwarded to an evaluation and regulation unit, for example an evaluation and regulation unit 33 as shown in FIGS. 1 to 3.
- an evaluation and regulating unit is provided which does not influence the roller speed, but makes other parameter settings on the drafting system, for example also changes the position of the pressure rod 20 in the main drafting zone 11.
- the results of the respective distortion force measurements can be fed into the evaluation and regulating unit 33 in order to change the control application point.
- FIG. 6 shows a side view of a drafting device 1, which essentially corresponds to that of FIG. 5.
- a spray device 50 is provided, which is arranged above the main drafting zone 11 and, if necessary, sprays a fluid F onto the nonwoven fabric FV.
- the fluid F is water, which is used to increase the air humidity and thus - when used in sufficient quantity - to reduce the fiber friction.
- the spray device 50 is activated, for example, via an evaluation and regulation unit (not shown), which receives a signal with information about relatively high distortion forces.
- the high distortion forces can mean that the fiber friction is relatively high and can therefore be reduced by means of the fluid F to be sprayed.
- other causes for measured high distortion forces are also possible (or equivalent variables such as the deflection of an element in contact with the fiber fleece FV such as the pressure rod 20 of FIG. 5, the torque of a drafting roller or the power consumption of a drive motor).
- spray devices can also be provided before and / or after the drafting system and / or above the draft zone.
- Spray devices connected downstream of the drafting system can be used in such a way that the fiber friction by spraying in smaller quantities Amounts of water may also be increased to ensure safe transport of the nonwoven fabric to the flyer
- the invention can also be used in such a way that the measured values from the various measuring elements listed above are stored in a memory and, for example, periodic fluctuations are identified on the basis of these stored values;
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Spinning Or Twisting Of Yarns (AREA)
- Treatment Of Fiber Materials (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2001295484A AU2001295484A1 (en) | 2000-08-23 | 2001-08-18 | Method for operating drawing equipment and drawing equipment |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10041434.6 | 2000-08-23 | ||
DE10041434 | 2000-08-23 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2002016683A2 true WO2002016683A2 (de) | 2002-02-28 |
WO2002016683A3 WO2002016683A3 (de) | 2002-08-08 |
Family
ID=7653544
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2001/009543 WO2002016683A2 (de) | 2000-08-23 | 2001-08-18 | Verfahren zum betreiben eines streckwerks sowie streckwerk |
Country Status (4)
Country | Link |
---|---|
CN (1) | CN1469945A (de) |
AU (1) | AU2001295484A1 (de) |
DE (1) | DE10140645B4 (de) |
WO (1) | WO2002016683A2 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016074767A1 (de) * | 2014-11-13 | 2016-05-19 | Saurer Germany Gmbh & Co. Kg | Verfahren zum betreiben einer textilmaschine und textilmaschine |
WO2016127964A1 (en) * | 2015-02-13 | 2016-08-18 | Vuts, A.S. | Method and device for continuous measurement of cohesive forces in roving or a similar fiber bundle |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10160123A1 (de) * | 2001-12-07 | 2003-06-26 | Zinser Textilmaschinen Gmbh | Verfahren und Vorrichtung zum Bündeln eines in einem Streckwerk verzogenen Faserverbandes |
DE10307415A1 (de) * | 2002-02-20 | 2003-09-18 | Rieter Ingolstadt Spinnerei | Textilmaschine mit einem Streckwerk |
DE10227676A1 (de) | 2002-06-20 | 2004-01-08 | Rieter Ingolstadt Spinnereimaschinenbau Ag | Verfahren und Vorrichtung zur Auswertung von Signalen eines Sensors |
CH696666A8 (de) | 2002-09-13 | 2007-11-15 | Truetzschler Gmbh & Co Kg | Vorrichtung zum Dublieren und Verziehen von Faserbaendern. |
DE10329835B4 (de) * | 2002-09-13 | 2012-05-31 | Trützschler GmbH & Co Kommanditgesellschaft | Vorrichtung an einer Strecke mit einem Streckwerk zum Doublieren und Verziehen von Faserbändern mit einer Verstelleinrichtung |
DE10317430B4 (de) * | 2003-04-15 | 2011-05-12 | Rieter Ingolstadt Gmbh | Textilmaschine mit einem Streckwerk |
CN101126186B (zh) * | 2007-04-11 | 2011-06-08 | 东华大学 | 在线检测短纤维束牵伸力的牵伸装置 |
DE102014117241A1 (de) * | 2014-11-25 | 2016-05-25 | Rieter Ingolstadt Gmbh | Verfahren zum optimierten Verstrecken von zumindest einem Faserband in einer Textilmaschine sowie Textilmaschine |
DE102018125547A1 (de) * | 2018-10-15 | 2020-04-16 | TRüTZSCHLER GMBH & CO. KG | Druckregelung an einem Streckwerk |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2905976A (en) * | 1955-04-01 | 1959-09-29 | Linen Industry Res Ass Of The | Drafting of textile fibres |
DE1062587B (de) * | 1956-02-03 | 1959-07-30 | Walther Wegener Dr Ing | Verfahren und Vorrichtung zum selbsttaetigen Vergleichmaessigen von Faserbaendern, Vorgarnen u. dgl. beim Verstrecken |
DE1141212B (de) * | 1961-07-29 | 1962-12-13 | Walther Wegener Dr Ing | Vorrichtung zum selbsttaetigen Vergleichmaessigen von Faserbaendern beim Verstrecken |
FR1324756A (fr) * | 1962-06-08 | 1963-04-19 | Cotton Silk & Man Made Fibres | Perfectionnements à l'étirage de matières fibreuses |
DE3315247A1 (de) * | 1983-04-27 | 1984-10-31 | Zinser Textilmaschinen Gmbh, 7333 Ebersbach | Spinnmaschine |
EP0477589B1 (de) * | 1990-09-26 | 1996-04-24 | Maschinenfabrik Rieter Ag | Verfahren zur Korrektur eines ermittelten Messsignals zur Masse eines Faserbandes an einem Regulierstreckwerk für Faserbänder mit einem Auslaufmessorgan |
DE4113565C2 (de) * | 1991-04-25 | 1994-05-11 | Zinser Textilmaschinen Gmbh | Verfahren und Vorrichtung zur Überwachung der Verzugskraft in Streckwerken von Spinnereimaschinen |
DE4142110A1 (de) * | 1991-12-19 | 1993-06-24 | Rieter Ag Maschf | Verfahren zur klimatisierung von vorgarn in spinnmaschinen und spinnmaschine zur ausfuehrung dieses verfahrens |
DE4294987C2 (de) * | 1992-08-07 | 1997-04-30 | Tsuzuki Spinning Co | Anlage zum Regulieren des Feuchtigkeitsgehalts einer Lunte |
DE19822886B4 (de) * | 1997-07-01 | 2007-03-29 | TRüTZSCHLER GMBH & CO. KG | Regulierstreckwerk für einen Faserverband, z. B. Baumwolle, Chemiefasern o. dgl. mit mindestens einem Verzugsfeld |
DE19906139B4 (de) * | 1999-02-13 | 2008-01-10 | TRüTZSCHLER GMBH & CO. KG | Regulierstreckwerk für einen Faserverband, z. B. Baumwolle, Chemiefasern o. dgl., mit mindestens einem Verzugsfeld |
-
2001
- 2001-08-18 DE DE10140645A patent/DE10140645B4/de not_active Expired - Fee Related
- 2001-08-18 AU AU2001295484A patent/AU2001295484A1/en not_active Abandoned
- 2001-08-18 CN CNA018174256A patent/CN1469945A/zh active Pending
- 2001-08-18 WO PCT/EP2001/009543 patent/WO2002016683A2/de active Application Filing
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016074767A1 (de) * | 2014-11-13 | 2016-05-19 | Saurer Germany Gmbh & Co. Kg | Verfahren zum betreiben einer textilmaschine und textilmaschine |
WO2016127964A1 (en) * | 2015-02-13 | 2016-08-18 | Vuts, A.S. | Method and device for continuous measurement of cohesive forces in roving or a similar fiber bundle |
Also Published As
Publication number | Publication date |
---|---|
DE10140645B4 (de) | 2011-11-24 |
DE10140645A1 (de) | 2002-03-21 |
WO2002016683A3 (de) | 2002-08-08 |
CN1469945A (zh) | 2004-01-21 |
AU2001295484A1 (en) | 2002-03-04 |
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