EP3211127B1 - Coiling machine for coiling cotton strips into cotton coils - Google Patents

Description

The invention relates to a winding machine for winding fiber tapes made of wadding onto a tube.

Winding machines are known for the production of a lap roll, in which the lap roll is pressed against the winding rollers with a high force of up to 15,000 N during the winding process. This high force is necessary in order to compress the wadding to such an extent that a winding length of 300 m can be wound up into a wadding roll with a diameter of around 550 mm. The disadvantage is that the resulting high force pulls the lap lap into the gusset between the rigid winding rollers and is permanently deformed in the process. The compressive force on the wad of cotton and the deformation cause the wad to heat up to 40 ° - 60 ° C and thus sticky substances in the cotton lead to the fiber layers sticking together, which leads to increased hairiness when unrolled. A reduction in the winding force, depending on the fibers used, can lead to air being entrained during the winding process, which creates air bubbles between the fiber layers that lead to warping and make the lap unusable for the further combing process. This can essentially only be compensated by a lower winding speed, which reduces combing productivity.

The ribbon winding technology represents a further development of the classic winding process using winding rollers ( DE 19630923 A1 ), in which a winding belt is used instead of the two winding rollers. The wrapping tape encloses the lap roll on its outer circumference at an angle of 155 ° to 270 °, depending on the embodiment. The tensile force acting on the wrapping tape acts as a winding force that is distributed over the circumference of the wrap. The deformation of the lap is reduced to a minimum by the wrapping tape, since the wrapping tape absorbs possible deformations. This has the disadvantage that, due to this load, the wrapping tapes have to be replaced after a few months in operation, which is very expensive. Since the length of the tape has to cover the circumference of a full lap and the opening to remove the lap, the tape is designed to be significantly longer than is required for the pure winding process. Therefore, guiding the tape and keeping the winding tape under constant tension is extremely complex in terms of design, which can only be compensated to a limited extent by the higher winding speed.

The CN 1161677 A discloses a winding device for packaging insulation material, which is wound around a mandrel between two horizontally arranged belts and laterally ejected again.

The WO 85/01278 describes a wrapping device for piece goods that are wrapped by a belt by means of film.

In the CA 2475484 A1 a winding device is disclosed which winds fiber material made of fiberglass by means of three belts. The winding tube and the fibers are fed in via a horizontal feed belt.

The object of the invention is to develop a winding machine for winding fiber ribbons from wadding, which has a high productivity, can be produced inexpensively and has a low maintenance requirement.

This object is achieved according to the preamble of claim 1 and with the respective characterizing features. Advantageous further developments of the invention are given in the dependent claims.

The invention includes the technical teaching that the wadding is guided to the sleeve by a first endless revolving belt, and that a second endless revolving belt guides the wadding around the sleeve.

In contrast to the prior art, in which the lap roll is formed by a single circumferential belt, when winding between two belts, a delay can be set due to different speeds, whereby the hardness of the roll can be adjusted. This preferably assumes that each belt has a separate drive. The delay can be in the range of a speed difference between the belts of 0.5 to 5%, preferably 2%.

The use of two separate belts results in a structurally simpler guidance and the build-up of the belt tension due to the absolutely lower elongation is easier and more precise to implement. Another essential advantage is that an empty tube can be fed in from one side between the belts (here in the exemplary embodiment above) and the finished lap can be discharged on the other side between the belts (here in the exemplary embodiment from below). The idle time for the change can thus be significantly reduced.

According to an advantageous embodiment, each of the two belts wraps around the sleeve or the lap roll by 50 ° to 120 ° during the winding process. This ensures sufficient contact between the belts and the wadding, with which the entrained air is pressed out through the wadding. The belts and the associated deflections are arranged symmetrically to the sleeve or to the lap roll. Each belt is guided around at least two deflections, the winding being formed in the area between the deflections.

According to the invention, at least one deflection is designed to be movable in such a way that a sleeve can be fed between the belts or the lap roll can be removed from the winding machine. Both deflections are preferably designed to be movable apart.

Each belt advantageously has a separate tensioning device with which the tension of each individual belt can be individually adjusted.

Fig. 1

eine erfindungsgemäße Wickelmaschine in schematischer Darstellung;

Fig. 2

eine weitere schematische Darstellung der Wickelmaschine für die Hülsenzuführung;

Fig. 3

eine schematische Darstellung der Wickelmaschine zum Abtransport der Wattewickel.

Further measures improving the invention are shown in more detail below together with the description of a preferred exemplary embodiment of the invention with reference to the figures. Show it:

Fig. 1

a winding machine according to the invention in a schematic representation;

Fig. 2

a further schematic representation of the winding machine for the tube feed;

Fig. 3

a schematic representation of the winding machine for the removal of the lap.

In the embodiment of Figure 1 24 to 32 slivers run from cans, not shown, into one or two drawing units, not shown, are drawn there and doubled together in a subsequent table calender, so that the resulting wad 2 can consist of a total of 24 to 32 slivers before it is wound up. In the inlet area of a winding machine 1, the wadding 2 runs in the direction of material flow (arrow) to the printing rollers 3a - 3d. The wadding 2 circulates at least partially one after the other the pressure rollers 3a, 3b, 3c and 3d, between which it is stretched until it is gripped by the first belt 6 between the pressure roller 3d and the deflector 8 and fed to the sleeve 4 and wound up. The sleeve 4 can be clamped and / or guided at its end faces by means of a plate, whereby the wadding 3 also experiences a lateral guidance for the winding process at the same time.

The wadding 2 is guided around the sleeve 4 by approx. 50 ° to 120 ° by the first belt 6 and is transferred to the second belt 7 through the adhesion to the sleeve 4 in the gusset between the deflections 10, 11.

This second belt 7 also guides the wadding around the sleeve 4 by approx. 50 ° to 120 ° until a new layer of wadding covers the first layer of wadding. In this embodiment, the sleeve 4 rotates with the lap roll 5 counterclockwise. The belts 6, 7 are each guided around an upper deflection 8, 9 and a lower deflection 10, 11. Furthermore, the belts 6, 7 are each guided and deflected around a tensioning device 12, 13 with which the belt tension is generated for the winding operation and for the subsequent functions (tube feeding and winding ejection). This embodiment requires an approximately symmetrical arrangement of the belts 6, 7 and their deflection 8, 9, 10, 11. In the case of an asymmetrical arrangement, a belt (6 or 7) can wrap a lap of cotton wool by approx. 50 ° to 180 °.

The belt 6, 7 can be driven via a driven deflection 10, 11 or 8, 9, the deflection 10, 11 being more suitable for reasons of the structural arrangement. As an alternative, the belts 6, 7 can also be driven by the rollers of the tensioning device 12, 13, which thus assume several functions at the same time. For the winding process, one or more nozzles can be provided in the gusset between or below the deflections 10, 11, which briefly press the beginning of the wadding 2 against the sleeve 4 with air until the beginning of the wadding 2 is carried along by the belt 7 becomes. During the winding process, the lap roll 5 can at least partially rest on the deflections 10, 11, which can depend, among other things, on the distances between the deflections 8 and 10 or 9 and 11. Resting on the deflectors 10, 11 can have the advantage that the tension and thus the load on the belts 6, 7 can be reduced, which extends their service life. This assumes that when the wadding roll is guided sideways through the side plates, these can move flexibly in height.

In contrast to the prior art, the device according to the invention has the advantage that the belt guide can be implemented more easily due to the shorter belt and the associated absolute belt elongation, since the belt tension can be compensated for over a shorter travel distance. Another significant advantage over the one-belt solution according to the prior art is the setting of a delay between the two belts 6 and 7, via which the hardness of the lap 4 can be adjusted. It has been found that the open gap or gusset between the deflections 10 and 11 has no influence on the quality of the lap or any possible entrainment of air.

In Figure 2 it is shown how the upper deflections 8, 9 were moved outwards in order to create space for the supply of a new sleeve 4. The cotton roll 5 with the sleeve 4 from Figure 1 is shown in dash-dotted lines for comparison. The new tube 4 can be thrown vertically from above into the gap between the belts 6, 7, or fed horizontally. The sleeve 4 is laterally chambered and guided at its end faces by winding disks (not shown). After the new sleeve 4 has been fed in, the deflections 8 and 9 are accordingly returned to their starting position Figure 1 proceed. The mobility of the rollers of the tensioning device 12, 13 is not shown for the sake of simplicity. The wadding 3 is carried along by the belt 6 after the last pressure roller 3 d and fed to the sleeve 4. Due to the smaller diameter of the sleeve 4 compared to the finished lap roll 5, the wadding 2 is only guided over a circumference of approximately 70 ° around the sleeve 4, the circumference increasing to approximately 120 ° as the diameter of the lap roll 4 increases. The sleeve 4 moves vertically upwards with the sleeve plates on the side. The movable arrangement of the deflector 8, 9 can take place by means of horizontally arranged guides. But you can also downwards at an angle take place, this movement can also take place on a straight guide or by means of a swivel joint.

In Figure 3 the finished lap 5 from the winding machine 1 is placed on a transport device 14. The transport device 14 can be designed as a carriage or as a conveyor belt. Before that, however, the wadding between the pressure rollers 3c and 3d, or 3b and 3c, or between the pressure rollers 3a and 3b, is torn off, with a pressure roller 3a or 3b or 3c being stopped while the pressure roller 3b, 3c or 3d which is at the front in the transport direction continues to run.

For the output of the finished lap 5 from the winding machine 1, at least one of the deflections 10 and 11 must move apart in order to create space for the lap 5 to pass through. Depending on the structural implementation, this moving apart could be sufficient to transfer the lap roll 5 down to a transport device 14. It can be useful to move the deflection rollers 8 and 9 apart so that when the lap roll 5 is moved down, it is not damaged by the belts 6, 7 on its outside. In this embodiment, both deflections 10, 11 move outwards and create space for the removal of the lap 5. In the case of an unsymmetrical arrangement of the belts and the deflections not according to the invention, it may be sufficient if only one of the deflections (10 or 11) can be moved outwards is.

So that the belts 6, 7 have sufficient tension in this open position of the winding machine 1, the rollers of the tensioning devices 12, 13 can also be moved apart so that the belts 6, 7 are guided further in the lateral guides and the belts 6, 7 have a minimum voltage.

After the lap roll 5 has been dispensed from the winding machine 1, the deflections 10, 11 first move back to their original position Position to accordingly Figure 2 pick up and hold the empty case. After the deflectors 8, 9 have been moved back into their original position, the tensioning devices 12, 13 re-establish the tension of the belts 6, 7 and the belts are set in motion to form a new roll. In this exemplary embodiment, the sleeve 4 rests on the deflections 10, 11, which can relieve the belt 6, 7 for the winding process. Depending on the belt tension, the sleeve 4 can also adjust itself centrally between the deflections 8 and 10 or 9 and 11 and not rest on the deflections. For this purpose, the side plates are preferably positioned in a stationary manner.

The winding machine according to the invention has the advantage that, through the use of two belts 6, 7, a delay can be built up in that the belts 6, 7 are operated at different speeds. In this way, the winding quality can be influenced by winding the wadding harder or softer depending on the fibers used. The use of two separate belts 6, 7 results in a structurally simpler guidance and the build-up of the belt tension due to the absolutely lower elongation is easier and more precise to implement. Another significant advantage is that an empty tube 4 is fed from one side between the belts 6, 7 (here in the exemplary embodiment above) and the finished lap 5 is removed from the other side between the belts 6, 7 (here in the exemplary embodiment from below) can. The idle time for the change can thus be significantly reduced.

The invention also provides a control for the belt tension, which can preferably take place as a function of the wound and measured lap length or lap length, the lap quality, the elastic behavior of the lap 5, for example due to the moisture of the lap, in the control With can be taken into account. The current diameter of the lap roll 5 is interpolated via the winding length and the aforementioned parameters, so that the tensioning device 12, 13 releases or tightens the belts 6, 7 via the control so that the lap roll 5 is wrapped around both of them with the largest possible angle of wrap Belt 6, 7 is wound.

A lateral belt guide can preferably be integrated into the deflections 8-11. As an alternative or in addition, a lateral belt guide can also be arranged between the deflections 8-11 within the winding machine.

The belts 6, 7 can preferably be designed as flat belts. In a further advantageous embodiment, the flat belts can have many small holes with a diameter of 0.5 mm to 5 mm in order to discharge the air entrained in the wadding 2, that is to say have a perforation. In a further embodiment, the belts 6, 7 can have a multilayer structure, an inner layer being designed in such a way that it has high strength and low elongation. On the other hand, an outer layer which comes into contact with the wadding 2 should preferably have an acceptable friction without the wadding tending to stick to this layer.

As an alternative to the design as a flat belt, the belt 17 can have at least one wedge shape, preferably several wedge shapes, on its rear side, which engage in corresponding grooves in the deflections 8-11 and in the tensioning device 12, 13. The wedges arranged on the back of the belt ensure that the belt guide is integrated into the revolving rollers 8-13.

Alternatively, each belt 6, 7 can be designed as belt strips spaced apart from one another. In this way, on the one hand, the air carried along by the wadding can also be discharged. Another advantage This solution is that each belt strip can vary in terms of its tension in a predetermined range, whereby the winding quality can be adapted over the winding width. In this case, broad belt strips are preferably used at the edge of the lap 5, which can become narrower towards the center of the lap 5. These belt strips, too, can each have at least one wedge on their rear side which engages in a corresponding groove in the deflections 8-11 or the tensioning device 12-13. This also ensures that the belt is guided on the side.

The arrangement of the winding machine 1 according to the Figures 1 to 3 shows a vertical arrangement in which the tube is fed in from above or from the side and the finished lap is transferred to a transport device 14 at the bottom. The course of the belts 6, 7 also takes place in a vertical orientation.

A horizontal arrangement of the winding machine is also conceivable, in which the device according to the Figures 1 to 3 is pivoted by 90 °, so that the cotton wool is guided approximately horizontally from the pressure roller 3 d over the belt 6 to the sleeve 4.

As mentioned above, an asymmetrical arrangement of the belts 6, 7 and deflections 8-11 is also possible, with one belt (6 or 7) looping around the sleeve 4 and the lap roll 5 by approx. 50 ° to 180 °. In principle, it is conceivable that only one belt (6 or 7) with the associated deflections for receiving the sleeve 4 and for transporting the lap 5 is adjustably arranged, while the other belt is arranged in a stationary manner.

Reference number

1

Winding machine

2

Cotton wool

3a, 3b, 3c, 3d

Pressure roller

4th

Sleeve

5

Cotton swab

6th

belt

7th

belt

8th

Redirection

9

Redirection

10

Redirection

11

Redirection

12th

Jig

13th

Jig

14th

Transport device

Claims (8)

1. A winding machine for winding slivers of lap (2) on a bobbin (4) to a lap roll (5), in which 24 to 36 slivers are guided into the winding machine and doubled to lap (2), the lap (2) being drafted by pressure rolls (3a to 3d) and guided to the bobbin (4) by a first endless circulating belt (6), wherein a second endless circulating belt (7) guides the lap (2) around the bobbin (4), and wherein and wherein each belt (6, 7) is guided around at least three deflections (8, 10, 12; 9, 11, 13),
   characterized in that the belts (6, 7) and the associated deflections (8, 10, 12; 9, 11, 13) are disposed symmetrically to the bobbin or to the lap roll, wherein at least one upper deflection (8 and/or 9) of one or both belts (6, 7) is/are formed for being displaceable apart such that a bobbin (4) can be supplied between the belts (6, 7),
   wherein the lap roll (5) is formed in the area between the upper deflections (8, 9) and the lower deflections (10, 11) of the belts (6, 7), and in that, when winding, the lap roll (5) rests on the lower deflections (10, 11) of the belts (6, 7), and in that the lower deflections (10, 11) are formed for being displaceable apart such that a lap roll (5) between the belts (6, 7) is removable.
2. The winding machine according to claim 1, characterized in that, during the winding process, each belt (6, 7) wraps around the bobbin (4) or the lap roll (5) at 50° to 120°, or in that at least one belt (6 or 7) wraps around the bobbin (4) or the lap roll (4) at 50° to 180°.
3. The winding machine according to any of the preceding claims, characterized in that each belt (6, 7) includes a separate tensioning device (12, 13).
4. The winding machine according to any of the preceding claims, characterized in that each belt (6, 7) includes a separate drive device.
5. The winding machine according to any of the aforementioned claims, characterized in that a device for laterally guiding the belts (6, 7) is disposed at or between the deflections (8, 9, 10, 11).
6. The winding machine according to any of the aforementioned claims, characterized in that, in the area of the deflection (10, 11), the belts (6, 7) form an open nip.
7. The winding machine according to claim 6, characterized in that at least one nozzle is disposed underneath the nip for generating air flow.
8. The winding machine according to any of the aforementioned claims, characterized in that a control controls the belt tension depending on the wound lap length.

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