EP3154886B1 - Winding machine for producing lap rolls and method for winding slivers - Google Patents

Description

The invention relates to a winding machine for winding slivers of cotton wool, with a winding unit, on or in which a winding is formed, wherein the winding machine has a device for generating a winding force on the lap roll.

Furthermore, the invention relates to a method for winding slivers.

The today usual feeding of flat combing machines is done by cotton wool, which were previously produced in winding machines from individual bands. For this purpose, the winding machine receives the template in ribbon form of at least one route, the template is cached in round or rectangular cans. The winding machine usually consists of a winding unit with at least two winding rollers on which the lap roll is formed by means of a sleeve. Preceding the winding unit are usually at least a pair of pressure rollers which deflect the bands, compress and / or possibly stretch. Before the pressure rollers, an inlet region is arranged by a further compression unit or a smoother can be arranged.

The quality of the produced roll is decisive for the productivity of the subsequent combing machine, as well as the producible quality of the sliver and the required amount of noil. A high uniformity, low hairiness and a good rolling characteristics characterize a good winding, so that the comber runs with the least possible standstill. These features can not be achieved when using Winding process by entrained air at high winding speeds large bubbles occur. The winding becomes uneven and sometimes even unusable. As the number of layers of wadding increases, blistering increases during the winding process.

In the EP 0945080 A2 describes a winding machine in which the lap roll is produced by a circulating belt. The winding machine has a plurality of sensors and measuring devices with which indirectly the winding diameter is determined in order to reduce the winding pressure with increasing winding diameter.

The DE 102006020586 A1 describes a method for winding cotton wool, in which by means of a speed control device for driving the winding rollers, the respective wound lap length is determined, and is assigned to a decreasing winding pressure. As the winding diameter increases, the winding pressure gradually decreases.

The EP 0140168 A2 describes a winding machine with a varying winding pressure, which builds on the increasing winding diameter a constant contact pressure.

The CH 283013 is based on the recognition that with increasing thickness of the coil, the contact pressure decreases. By continuously increasing the load on the winding tube and winding roller, the decreasing winding pressure is automatically compensated.

It is an object of the invention to provide a winding machine with which a high quality winding can be produced. It is another object of the invention to provide an associated method for winding slivers.

The invention solves the problem by the teaching of claim 1 and 7; Further advantageous features of the invention are characterized by the subclaims.

According to the technical teaching according to claim 1, the winding machine for winding fiber slivers of wadding comprises a winding unit, on or in which a winding is formed, wherein the winding machine has a device for generating a winding force on the lap roll.

The invention is characterized in that the winding machine has at least one sensor for determining the actual diameter of the lap roll during the winding process, and that the winding force can be varied depending on the resulting bubbles.

In contrast to the prior art, the winding force does not decrease with increasing winding length, but at least at the beginning of the winding process continuously. In this way, the surface pressure between the lap roll and the winding rollers is not reduced as much as in a sloping curve due to the increasing contact surface of the growing coil. An increased occurrence of the Walkens on the winding rollers can be counteracted by the steepness of the curves. As a result, the inner layers are strengthened so far that only a slight walking occurs. Another difference is the continuous increase of the winding force to a maximum value. In the prior art, the increase or decrease of the winding force in stages is known, which has a negative effect on the hairiness of the unwinding reel, since with each new stage of the lap roll in the rolling suddenly or abruptly change, which is negative in the comber makes noticeable.

In an advantageous embodiment, the winding force over the winding length by means of a control is adjustable. For this purpose, the winding machine in addition to the controller on a database in which are stored for different fiber materials, the optimal data for the winding curve for each fiber mixture.

The winding curve can also be generated via arbitrarily settable setting points on the control of the winding machine. It can e.g. At the beginning of the winding, where a strong change in the winding force makes sense, the set points are set at short intervals. At the end of the winding formation, in which a constant high winding force can be useful, the distances between the setpoints can be increased. Due to this flexible definition of the set points over the winding length, the winding curves can be freely modeled, whereby the winding machine can adapt to the process, the production conditions and the fibers presented arbitrarily.

For the purposes of the invention, a continuous increase in the winding force is considered as at least direct, ie straight or curved connection between two setpoints. This distinguishes the invention from the prior art, in which the setting points are approached in stages, with the disadvantage that a steep increase in the winding force is possible only in large jumps. In a further step, an efficient control can interpolate a continuous curve through all setting points, so that the winding curve no longer has any break points, which has a very positive effect on the hairiness and the rolling behavior of the roll in the combing machine.

The inventive method for winding fiber slivers is characterized in that the winding force over the winding length along a varying winding curve is adjustable, whereby the winding force increases continuously at least at the beginning of the winding process, and that the winding force is variable depending on the resulting bubbles during winding.

Depending on the fiber quality, such as the fiber fineness, and / or depending on the humidity of the fibers to be processed, both the steepness of the winding curve, as well as the position or the Course of the winding curve, for example, up to 20 kN winding force can be varied. Since bubble formation can increase with increasing winding speed, this effect can be counteracted by a steeper rise and an increase in the winding pressure.

In order to avoid possible blistering fully automatically during operation, the actual diameter of the lap roll is determined by a sensor. By comparison with the nominal diameter, the controller determines whether large or locally smaller bubbles have been created by entrained air. The control regulates the winding force until the deviation of the diameter is within a tolerance field, which may be, for example, 1 mm difference in diameter. The desired diameter of the lap roll can be determined by a sensor that transmits the number of revolutions of the lap roll to the controller. Due to the preset fiber quality and the thickness of the wadding or sliver, the controller determines the nominal diameter of the wadding at all times. Depending on the fibers to be processed, the controller also processes correction values for the lap behavior of the lap roll, the deformation of the lap during winding and other material-dependent parameters.

Further advantageous embodiments are characterized by the subclaims.

In the context of the invention, slivers are generally cotton, for example made of cotton, fibers, fleece or pile, which can be wound up in a spinning mill for intermediate storage, transport or further processing. The slivers or conveyor belts are doubled in the area of the table calenders or drafting systems in the inlet area to a cotton wool band.

Figur 1:

eine schematische Darstellung einer Wickelmaschine;

Figur 2:

eine weitere Darstellung der erfindungsgemäßen Wickelmaschine;

Figur 3:

eine Darstellung der Wickelkraft über die Wickellänge.

The invention will be explained in more detail with reference to an embodiment. It shows:

FIG. 1:

a schematic representation of a winding machine;

FIG. 2:

a further illustration of the winding machine according to the invention;

FIG. 3:

a representation of the winding force over the winding length.

In FIG. 1 a winding machine 1 is shown, as used for example in the Kämmereivorbereitung in the textile industry. Several slivers 3, which may consist of natural or synthetic fibers are fed via cans of the winding machine 1 and stretched in a drafting system, not shown. The slivers 3 are further passed over an inlet region 2 to a plurality of pressure rollers 4a - 4c, which guide the slivers 3 in the catchment area between two winding rollers 5a, 5b and a winding tube 6 for producing a lap roll. In or on the inlet region 2, a supercharger 8 may be arranged, which makes the sliver 3 uniform. Not shown are arranged in the inlet region 2 table calender, arranged in front of the table calender drafting and arranged in front of the winding machine 1 gate. Alternatively, the lap roll can also be produced within an endlessly circulating belt or between one or two winding rollers and a circulating belt. Furthermore, in the winding machine, a sensor L1 may be arranged, which determines the diameter of the lap roll 15 during the winding process. The sensor N1 can determine the number of revolutions of the lap roll 15.

In the FIG. 2 a cotton roll 15 'has already been placed on a transport device 20. In preparation, the sliver 3 between the pressure rollers 4b and 4c was demolished by the Winding rollers 5a and 5b continue to rotate and, for example, the pressure rollers 4b and 4c are stopped very quickly. Alternatively, a tearing of the sliver 3 is also possible between the pressure rollers 4c and the winding roller 5a. Further, one of two slides 10 can be seen here, which are obliquely movable along a guide 12 arranged on both sides of the machine housing. The carriage or carriages 10 are moved along the guide 12 by means of at least one cylinder 13, for example a pneumatic cylinder. Each carriage 10 has its own reel disc 9, which are movable toward or away from each other and thereby can hold the winding tube 6 by clamping. At the beginning of the winding process, a new winding tube 6 is placed laterally through the opening 11 in the gusset between the winding rollers 5a, 5b. Alternatively, the winding tube 6 can be placed through another machine opening in the gusset between the winding rollers 5a, 5b. The reel disc 9 move with the carriage 10 obliquely down in working position and clamp the winding tube 6 a. New sliver 3 is introduced via the pressure rollers 4a, 4b, 4c in the gusset between the winding rollers 5a, 5b and the winding tube 6, so that - after the winding tube 6 was clamped by the winding plates 9, the winding process by rotating the winding rollers 5a, 5b can start, which represents the beginning of the winding position, which moves with increasing outer diameter of the lap roll 15 to be formed against the pulling direction Z. During the winding process, the cylinder 13 pulls the carriage 10 along the guide 12 in the pulling direction Z, so as to build up a static winding pressure or a dynamic winding pressure corresponding to the winding quality to be achieved. In this case, the lap roll 15, the winding tube 6 is clamped by the reel disc 9, pulled against the winding rollers 5a, 5b. Alternatively, the lap roll can also be formed solely by a band or a band with a roller.

After a predetermined length of, for example, 300 to 400 m, the fiber ribbons 3 in the region of the pressure rollers 4a, 4b, 4c or the winding roller 5a are torn off and the finished lap roll 15 is transferred to a transport device 20.

In FIG. 3 the winding pressure or the winding force over the winding length is shown.

On the abscissa, the winding length of the lap roll in meters is plotted and on the ordinate the winding force in kilo-Newton. Since the winding pressure is applied by at least one, preferably two laterally arranged cylinder 13, the winding force is converted into a winding pressure in a control. For example, a winding force of 12 kN can be assigned a winding pressure of 6 bar, which is applied via two pneumatic cylinders. By means of pneumatic cylinders, the winding machine can apply a pressure of 16 kN, which corresponds to a system or winding pressure of twice 8 bar. In another structural design with hydraulic cylinders 13, depending on the material quality, a winding force of 20 kN can be applied, which corresponds to a system or winding pressure of 10 bar for two cylinders 13 of the same size.

In contrast to the prior art, the winding force does not decrease with increasing winding length, but continuously. Another difference is the continuous increase of the winding force to a maximum value. In the prior art, the increase or decrease of the winding force in stages is known, which has a negative effect on the hairiness of the unwinding reel, since with each new stage of the lap roll in the rolling suddenly or abruptly change, which is negative in the comber makes noticeable. According to the invention, the winding pressure increases from a low value in the winding interior (for example, at a winding length of 0 to 50 m) a maximum value. In this way, the surface pressure between the lap roll 15 and the winding rollers 5a, 5b does not decrease as much as in a sloping curve due to the increasing contact surface of the growing coil. An increased occurrence of the Walkens on the winding rollers 5a, 5b can be counteracted by the steepness of the curves. As a result, the inner layers are strengthened so far that only a slight walking occurs.

The upper curve in FIG. 3 shows the course of the winding force, as it can be set by default in normal cotton, such as Matto Grosso. The winding force begins at Anwickeln, so with a winding length of 0 m with about 3.6 kN and increases up to the winding length of about 50 m to the maximum value of 12 kN. With this force, the lap roll is applied to the final length of 400 m, that is, over the remaining winding length of about 350 m with a continuously constant winding force is wound. With this upper curve 9 reference points ◆ are given in this example, which can be stored in the machine control, whereby the winding force increases continuously from one to the next reference point, and not abruptly, as in the prior art.

The lower winding curve has 10 reference points □, which are stored in the control of the winding machine, whereby the winding force increases continuously from one to the next reference point. Again, the winding pressure starts at 0 m winding length with about 3.6 kN and increases continuously up to a winding length of 300 m to 12 kN. The remaining 100 m winding length up to a winding length of 400 m is again wound with a constant winding force of 12 kN.

Depending on the fiber fineness, for example in the range of 55 to 80 ktex, and / or depending on the moisture of the processed Fibers can be varied both the steepness of the winding curve, as well as the position and the course of the winding curve, for example, up to 20 kN winding force. Since bubble formation can increase with increasing winding speed, this effect can be counteracted by a steeper rise and an increase in the winding pressure.

Other reasons to vary the course of the winding curve, by the material template on the winding machine, for example, by the doubling or parallelism of the template of the slivers 3 or by the set total delay before the winding rollers 5a, 5b, be justified.

This can be produced depending on the fibers to be processed and the operating conditions high quality wraps, which are characterized by a low hairiness, good rolling behavior and a uniform distribution of hardness across the width of the lap roll.

The definition of the winding curve, that is, the winding force over the winding length, can be stored as a preset function of the fiber quality in the control of the winding machine. However, the winding curve can also be generated via arbitrarily definable setting points ◆, □ on the control of the winding machine. For example, at the beginning of winding, where a large change in the winding force makes sense, the setting points can be set at short intervals. At the end of the winding formation, in which a constant high winding force can be useful, the distances between the setpoints can be increased. Due to this flexible definition of the set points over the winding length, the pressure curves can be freely modeled, whereby the winding machine can adapt to the process, the production conditions and the fibers presented arbitrarily.

It is also conceivable to take back the winding force to the last end of the winding process again, so reduce, to increase the thickness of the outer layers.

The adjustment of the pressure curve takes little effort on the display of the machine control of the winding machine. The specified setpoints are connected linearly, so that no jumps occur in the course of the curve. For this purpose, the controller interpolates the increase in the winding force over the set winding length to the next setting point. Thus, between the linear areas of the set points, the winding curve has only slight creases in the curve, which, depending on the control, can also be interpolated into a single continuous curve and thus has neither cracks nor kinks.

By the variable adjustability of the winding force, the blistering can be reduced, whereby the winding speed and the quality of the lap roll is increased. The subsequent combing process is also positively influenced as the amount of combing is reduced and thus the change of the lap roll is reduced.

Referring to FIG. 1 can be arranged to automatically reduce the formation of bubbles, a laser sensor L1 within the winding machine 1, with which the actual diameter of the lap roll 15 can be measured during the winding process. In the illustration, only one sensor L1 is shown. In order to detect deviations of the diameter over the winding width, preferably a plurality of sensors L1 can be arranged across the width, or a sensor L1 can be moved over the width of the lap roll 15. Alternatively, the sensor L1 can also be designed so that it can detect the almost complete width of the lap roll 15. The one or more sensors L1 may be arranged stationarily on the housing of the winding machine, or be arranged on the carriage 10 or together with this movable. In the control of the machine, the quality of the fibers to be processed is entered, so that the thickness of the cotton or sliver 3 is determined by the setting of the upstream drafting and table calenders in the inlet region 2. About the sensor N1, which may be formed as an inductive proximity switch, the number of revolutions of the lap roll 15 can be determined. Thus, the current target diameter is determined as a reference variable of the lap 15 from the number of layers and the thickness of the cotton or sliver 3 and compared in the control with the actual diameter. If the actual diameter as a control deviation in the millimeter range is greater than the nominal diameter, a bubble may have formed during winding, for example. The controller then varies the pressure in the cylinders 13, whereby the winding force can fall or rise. Alternatively or additionally, the actuators of the winding rollers 5a, 5b can be controlled as actuators, so that the winding speed is reduced until the nominal diameter with the actual diameter of the lap roll 15 is again in a predetermined tolerance field. The resulting bubbles during winding can occur locally due to entrained air, whereby one or more separate bubbles between the outer layer of the sliver or sliver 3 and the lap 15 arise. If it is then continued with the same winding force and, if necessary, at the same speed, it can form a large-area blister which divides the formed cotton or sliver 3 into irregular strips, since the air wishes to escape, as a result of which there are gaps due to stresses in the collected air. Distortions, imperfections and irregularities occur that can have a negative effect when combing. Due to the air bubbles, the diameter of the lap roll 15 can increase locally by several millimeters. The entrained air can lift the cotton or sliver 3 up to 10 mm from the wadding 15, which can be clearly determined by means of the laser sensor (s) L1. The control of Winding machine is provided with a tolerance field, .so that deviations, for example, in the range up to 1 millimeter do not affect the winding force and the winding speed, since small air bubbles can dissolve again.

reference numeral

1

winder

2

intake area

3

sliver

4a-4c

printing rollers

5a, 5b

winding roller

6

mandrel

7

Material flow direction

8th

supercharger

9

winding plate

10

carriage

11

opening

12

guide

13

cylinder

15

lap

20

transport device

Z

tensile direction

L1

sensor

N1

sensor

◆, □

Set Point

Claims (18)

1. A winding machine for winding fibre bands of lap, with a winding unit, on which or in which a wound lap is formed, wherein the winding machine includes a device for generating a winding force onto the lap roll, wherein the device is adapted to adjust the winding force over the winding length along a varying winding curve and having it continuously increase, at least in the beginning of the winding procedure, characterized in that the winding machine includes at least one sensor (L1) for determining the actual diameter of the lap roll (15) during the winding procedure, and in that the winding force is variable by the device depending on emerging bubbles.
2. The winding machine according to claim 1, characterized in that the winding force over the winding length is adjustable by means of a control.
3. The winding machine according to claim 2, characterized in that adjusting points of a winding curve may be input into the control, whereby the winding force is continuous, at least between the adjusting points.
4. The winding machine according to claim 1, characterized in that the winding unit comprises at least two winding rolls (5a, 5b).
5. The winding machine according to claim 1, characterized in that the device for generating the winding force comprises at least one cylinder (13), which generates the winding force.
6. The winding machine according to claim 1, characterized in that the winding machine includes a sensor (N1), which determines the number of revolutions of the lap roll (15).
7. A method for winding fibre bands of lap, with a winding unit, on which or in which a wound lap is formed, wherein the winding machine includes a device for generating a winding force onto the lap roll, wherein the winding force is adjustable over the winding length along a varying winding curve, and wherein the winding force continuously increases, at least in the beginning of the winding procedure, characterized in that the actual diameter of the lap roll (15) during the winding procedure is detected by at least one sensor (L1), and in that the winding force is variable depending on bubbles emerging during winding.
8. The method according to claim 7, characterized in that, at the beginning of the winding procedure, the winding force amounts to at least 10 % of the maximum winding force.
9. The method according to claim 7, characterized in that the winding force has reached a maximum at a winding length of 50 m.
10. The method according to claim 7, characterized in that the winding force increases to a maximum over the entire winding length.
11. The method according to any of the claims 7 to 10, characterized in that the winding curve is determinable by means of adjusting points, between which the winding force is continuous.
12. The method according to claim 11, characterized in that the winding curve continuously increases between the adjusting points.
13. The method according to claim 11, characterized in that the winding curve continuously increases from a minimum to a maximum value.
14. The method according to any of the claims 7 to 13, characterized in that bubbles are determinable by means of the at least one sensor (L1), wherein, depending on the size of the bubbles, the winding curve may be steeper or flatter.
15. The method according to claim 14, characterised in that the actual diameter of the lap roll (15) during the winding procedure is detected by a sensor (L1) and directed to a control.
16. The method according to any of the claims 7 to 15, characterized in that the number of revolutions of the lap roll (15) is detected by a sensor (N1) and directed to a control.
17. The method according to claim15, characterized in that in the event of the actual diameter of the lap roll (15) deviating from the nominal diameter the control changes the winding pressure.
18. The method according to any of the claims 7 to 17, characterized in that the winding force is variable depending on the fibre quality to be processed and the ambient parameters.

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