EP2321453B1 - Method and apparatus for heating of a guiding sleeve on a revolving bearing of a guiding roll - Google Patents

Description

The invention relates to a method for heating a rotatably mounted guide sleeve of a guide roller for guiding and heating threads according to the preamble of claim 1 and to an apparatus for carrying out the method according to the preamble of claim 6.

In the production and further processing of synthetic threads, it is generally known to lay one or more threads with multiple wrapping around a driven godet shell of a godet, so that the thread or threads are promoted due to a belt friction by the driven godet shell. In order to enable Mehrfachumschlingung on a godet, the godet usually a guide roller is assigned, which has a rotatably mounted guide sheath for receiving the Fadenumschlingungen. Such a leadership role is for example from the DE 26 39 439 known.

The known guide roller has a rotatably mounted guide sheath, which is rotatably supported by an air bearing on an axle. The heater is associated with a plurality of heating means to heat the guide sheath and a guided on the guide sheath thread.

In the known leadership role, it is necessary that the energy from the center of the guide roller in this case, the axis carrier must be passed to the outer guide sheath for heating the guide sheath. The formed between the guide sheath and the axle air bearing is a thermal resistance, which leads to corresponding energy losses. Therefore, relatively high temperatures must be generated on the axle, for example, to heat the guide casing to an outside temperature of 100 ° C. However, such heats in the axle lead to heat deformation, which form unfavorable to the air storage. The known leadership role is thus energetically very unfavorable to heat the guide sheath to a desired surface temperature.

It is therefore an object of the invention to provide a method and a device for heating a rotatably mounted guide sleeve of a guide roller, wherein the heat energy as directly as possible, the guide sheath can be fed.

Another object of the invention is to provide a method and apparatus for heating a rotatably mounted guide sleeve of a guide roller suitable for retrofitting an unheated guide roller to heat the guide sheath.

This object is achieved for a method according to the invention in that a compressed air is heated and that the heated compressed air is fed to the air bearing.

In the apparatus according to the invention for carrying out the method according to the invention, the solution of the problem is given by the fact that the compressed air line outside the guide roller is assigned a heating means by which a compressed air can be heated.

Advantageous developments of the inventions are defined by the features and feature combinations of the respective subclaims.

The invention is based on the finding that, in the case of an air bearing, the compressed air fed in between the rotating component and the stationary component is also suitable as a sliding medium in the heated state. In that regard, the compressed air can be used advantageously as a heat carrier to a heat energy directly to guide the guide sheath. The compressed air cushion generated for the storage of the guide casing can also be advantageously produced with the heated compressed air. The invention is thus characterized by the fact that no additional devices for heating the guide casing are required on the guide roller. The compressed air is heated outside the guide roller by a heating medium. The heating of the compressed air is thus flexible executable. For example, the compressed air can be heated directly inside a compressed air line by external heating media assigned to the compressed air line.

Particularly advantageous, however, is the development of the invention, in which the compressed air is heated in a separate compressed air heater by the compressed air is supplied from a compressed air source to the compressed air heater. For this purpose, the electric compressed air heater is connected in the compressed air line between the pressure source and a compressed air connection of the guide roller. This allows buffering of the compressed air, which enables intensive heating.

Regardless of the configuration of the heating means, the development of the invention is preferably used, in which the compressed air is heated to a desired temperature, an actual temperature of the compressed air is detected and the heating of the compressed air in response to a deviation between the target temperature and the actual temperature is regulated. For this purpose, a heating control is associated with the heating means, which is connected to a temperature sensor for detecting an actual temperature of the heated compressed air. This makes it possible to ensure that a predetermined surface temperature can be generated on the guide casing, which is kept substantially constant throughout the operating time.

In order to obtain a uniform distribution of the compressed air at the periphery of the guide casing within the air gap, the development of the invention is particularly advantageous, in which the heated compressed air is distributed within the guide roller by a porous sliding jacket in an air gap of the air bearing. This allows the hollow cylindrical guide sheath in the interior Thoroughly rinse over the entire length with the heated compressed air. For this purpose, the porous sliding jacket is held on the circumference of the axle carrier, on which at least one annular chamber connected to the compressed air connection is formed. The air gap between the guide casing and the porous sliding jacket, the heated compressed air over the entire, extending in the axial direction bearing length is supplied. This development of the invention is characterized in particular by the fact that intensive heating of the guide jacket by the heated compressed air is possible. Thus, surface temperatures at the guide shell in the range of 200 ° C and above can be achieved.

In conventional air bearings, in which the compressed air flows through nozzle openings directly into the air gap of the air bearing, the development of the invention according to claim 5 and claim 11 is particularly advantageous. Here, the heated compressed air is distributed within the guide roller through several nozzle holes in the air gap of the air bearing. The nozzle openings are advantageously formed directly on the axle, and connected to the compressed air connection. The air bearing is formed by an air gap between the guide casing and the axle.

The invention is particularly suitable for guiding and heating one or more threads within a manufacturing process or a further processing process. The use according to the invention in a melt spinning device, in which one or more threads are guided, heated and drawn through a plurality of godets, represents a particular advantage in order to allow continuous heating of the threads when the godets are wrapped several times. For this purpose, the threads are heated alternately on multiple wraps on the heated surface of the godet shell and the heated surface of the guide roller. A cooling phase, as usual in conventional guide rollers in the prior art, no longer occurs.

Thus, the use of the device according to the invention is particularly advantageous, in which a godet shell of the godet and the guide sheath of the guide roller are heated to a same high surface temperature.

Due to the high rotational speeds and low running resistance of the air-bearing guide rollers, the invention can be used in particular for high yarn speeds in the range of 4,000 m / min and above, for example, to draw a plurality of yarns in a melt spinning process.

The invention will be explained in more detail below with reference to some embodiments of the device according to the invention in accordance with the attached figures.

Fig. 1

schematisch eine Schnittansicht eines ersten Ausführungsbeispiels der erfindungsgemäßen Vorrichtung zur Durchführung des erfindungsgemäßen Verfahrens

Fig. 2

schematisch eine Schnittansicht eines weiteren Ausführungsbeispiels der erfindungsgemäßen Vorrichtung zur Durchführung des erfindungsgemäßen Verfahrens

Fig. 3

schematisch eine Ansicht einer Schmelzspinneinrichtung zur Verwendung einer erfindungsgemäßen Vorrichtung

They show:

Fig. 1

schematically a sectional view of a first embodiment of the device according to the invention for carrying out the method according to the invention

Fig. 2

schematically a sectional view of another embodiment of the device according to the invention for carrying out the method according to the invention

Fig. 3

schematically a view of a melt spinning device for use of a device according to the invention

In Fig. 1 a first embodiment of the device according to the invention for carrying out the method according to the invention is shown. In the embodiment according to Fig. 1 a guide roller 1 is shown in a cross-sectional view. The guide roller 1 has a rotatably mounted guide casing 2 on the guide casing 2 is formed for this purpose a hollow cylinder. The guide casing 2 is held on an axle carrier 3, which is fastened with a frame end 13 on a machine frame, not shown here. The frame end 13 protrudes from the guide casing 2 at an end face of the guide roller 1.

The axle carrier 3 extends essentially over the entire length of the guide casing 2, wherein an air bearing 4 is formed between the guide casing 2 and the axle casing 3 penetrating the guide casing 2.

In this embodiment, a sliding jacket 7 is arranged to form the air bearing 4 on the circumference of the axle beam 3. The sliding skirt 7 is formed from a porous material, for example an open-pore sintered metal or an open-pored sintered carbon. In the overlap region between the sliding skirt 7 and the axle carrier 3, two adjacent annular chambers 6.1 and 6.2 are formed on the circumference of the axle carrier 3 on the circumference. The annular chambers 6.1 and 6.2 are connected by a plurality of radially extending in the axle 3 distribution holes 10 with a compressed air channel 9. The compressed air channel 9 is formed in the central region of the axle carrier 3 and opens at the frame end 13 in a compressed air connection eighth

The sliding shell 7 forms with the guide casing 2 a circumferential air gap 5, so that a via the annular chamber 6.1 and 6.2 the sliding jacket 7 supplied compressed air is passed through the porous material of the sliding jacket 7 and on the mantle surface of the sliding jacket 7 enters evenly into the air gap 5.

For axial fixation of the guide casing 2 on the axle carrier 3, two stop rings 11.1 and 11.2 are respectively associated with the ends of the guide casing 2. The thrust rings 11.1 and 11.2 are each rotatably connected to the guide casing 2. The thrust rings 11.1 and 11.2 are fixed in relation to the front ends of the sliding skirt 7 on the guide casing 2, so that each form between the front ends of the sliding skirt 7 and the stop rings 11.1 and 11.2 radial gaps 12.1 and 12.2. The thrust rings 11.1 and 11.2 each have openings in the middle region, which produce a connection of the radial gaps 12.1 and 12.2 with the environment.

The compressed air supplied to the air bearing 4 in the air gap 5 compressed air is supplied via the compressed air port 8 of the guide roller 1. The compressed air connection 8 is connected via a compressed air line 15 to a compressed air source 16. The compressed air line 15 is associated with a heating means 14 to heat the compressed air connection 8 supplied compressed air. In this embodiment, the heating means 14 is formed by a heating coil 17, which heats the compressed air line and the compressed air therein. The heating coil 17 is associated with a heating control 18, which is connected to a temperature sensor 19. The temperature sensor 19 is assigned to the compressed air line 15 immediately before the inlet into the compressed air connection 8.

At the in Fig. 1 shown device is performed in the operating state on the circumference of the guide casing 2 of the guide roller 1, a thread or even a plurality of parallel juxtaposed threads with a Teilumschlingung. The guide casing 2 is driven by the thread or threads for rotation. For this purpose, compressed air is continuously supplied via the compressed air source 16 in order to be supplied to the compressed air connection 8 via the compressed air line 15. The compressed air is heated by the heating coil 17 to a predetermined target temperature before entering the guide roller 1. The heated compressed air then passes via the compressed air connection 8 in the compressed air channel 9 of the axle carrier 3 and is supplied via the distribution holes 10 to the annular chambers 6.1 and 6.2. Subsequently, the heated compressed air penetrates the sliding shell 7 and occurs on the mantle surface of the sliding jacket 7 continuously in the air gap 5 a. Thus, an air cushion is formed between the guide casing 2 and the sliding skirt 7, which extends substantially over the entire length of the air gap 5. As a result of the heated compressed air, the guide casing 2 is heated so that a required and predefined surface temperature for the yarn treatment is established on the outer circumference of the guide casing 2.

The continuously supplied to the air gap 5 heated compressed air then passes through the radial gaps 12.1 and 12.2 in the vicinity of the guide roller 1. In addition to the storage of the guide casing 2 so that a continuous temperature control of the guide casing 2 is achieved simultaneously.

In order to be able to comply with a predefined surface temperature on the guide casing 2, the heating coil 17 is assigned a heating control 18. The heating control 18 is connected to a temperature sensor 19, which continuously detects the temperature of the compressed air, which is introduced into the compressed air channel 9 of the axle carrier 3. In the event that a deviation between a predetermined setpoint temperature of the compressed air and a measured actual temperature of the compressed air is detected within the heating control 18, a control of the heating coil 17 takes place. Thus, a temperature control can be established which ensures a constant compressed air temperature.

In Fig. 2 a second embodiment of the device according to the invention is shown schematically. The embodiment is substantially identical in construction and in function to the aforementioned embodiment, so that at this point only the differences will be explained and otherwise reference is made to the above description. The components have been given the same reference numerals.

At the in Fig. 2 the device shown, the guide sheath 2 of the guide roller 1 is mounted directly on the axle 3. For this purpose, the axle carrier 3 has a bearing section 31, which is connected at one end face to the smaller frame end 13 in the diameter. At the periphery of the bearing portion 31 a plurality of uniformly distributed nozzle openings 22 are formed. The nozzle openings 22 are connected via nozzle bores 21 with radially extending distribution holes 10, which open into a central compressed air channel 9. The compressed air channel 9 is connected to the frame end 13 with the compressed air connection 8.

The air bearing 4 is formed by the radially encircling air gap 5 between the axle 3 and the guide casing 2. The air gap 5 extends in axial direction over the length of the bearing portion 31 of the axle beam 3, wherein at both ends of the bearing portion 31 of the guide casing 2, the stop rings 11.1 and 11.2. Thus, the radially extending at the end faces of the bearing portion 31 radial gaps 12.1 and 12.2 between the axle 3 and the stop rings 11.1 and 11.2.

The compressed air supply takes place in this embodiment by a compressed air source 16 and connected to the compressed air source 16 and the compressed air connection 8 compressed air line 15. To perform a heating of the compressed air, in the compressed air line 15 acting as a heating means 14 compressed air heater 20 is connected. Thus, first the supplied via the compressed air source 16 compressed air is fed into the compressed air heater 20 and heated to a predetermined compressed air temperature. Subsequently, the heated compressed air from the compressed air heater 20 is supplied to the compressed air connection 8.

For controlling and regulating the compressed air temperature of the heated compressed air, a temperature sensor 19 is provided, which is assigned to the compressed air channel 9 within the axle carrier 3. The temperature sensor 19 is connected to the heating controller 18, which is coupled to the compressed air heater 20 for control.

The function of in Fig. 2 illustrated embodiment of the inventive device for performing the method according to the invention is identical to the previous embodiment according to Fig. 1 , so that at this point a further explanation is dispensable.

The in the Fig. 1 and 2 illustrated embodiments of the device according to the invention are exemplary in the construction of the guide roller 1 and in particular in the structure of the air bearing 4. It is essential here that the air bearing 4 supplied compressed air can be heated by a heating means arranged outside the guide roller. In that regard, the invention is particularly suitable for retrofitting already installed in machine guide rollers with cold leadership coats, so that the compressed air used for air storage of the guide roller is supplied in the heated state.

The invention can be used particularly advantageously in melt spinning devices in which freshly extruded threads are guided, heated and drawn through godet systems. In Fig. 3 An embodiment of such a melt spinning device is shown schematically in a view. In this case, only the components of a melt spinning device which are essential for the use of the device according to the invention are shown. The melt spinning device has a spinner head 23 which carries a spinneret 24 on its underside. The spinning head 23 is connected via a melt inlet 32 with a melt source. Below the spinning head 23, a cooling shaft 25 and a godet system with a Abzugsgaletteneinheit 27 and a draw godet unit 28 is arranged. The withdrawal godet unit 27 is formed by a godet 29.1 and a cold guide roll 30. The godet 29.1 has a heated godet casing 33.

The downstream draw godet unit 28 is formed by a second driven godet 29.2 and a non-driven heated guide roll 1. The guide roller 1 is associated with a compressed air source 16 and a compressed air heater 20, so that the guide roller 1 according to the embodiment according to Fig. 1 or 2 having a heated guide casing 2. The godet casing 33 of the second godet 29.2 is also heated.

In the in Fig. 3 illustrated embodiment of the melt spinning device, a yarn 34 is spun from a polymer melt. For this purpose, the polymer melt is extruded through the spinneret 24 into a plurality of filaments, which are combined as a filament bundle 26 after cooling. The deduction of the filament bundle 26 from the spinneret 4 is carried out by the Abzugsgaletteneinheit 27. For this purpose, the Abzugsgaletteneinheit 27 is wrapped around the thread 34 several times. Through the heated godet casing 33, the thread 34 is heated to be drawn by withdrawal by means of the draw godet unit 28. At the draw godet unit 28, the thread 34 is also guided with multiple wrapping, wherein the thread for thermal treatment on the surface of the heated godet shell 33 and on the surface of the heated guide shell 2 of the guide roller 1 is heated. Subsequently, the thread is wound into a bobbin or further treated, for example crimped to produce a carpet yarn.

The surface temperature set on the godet casing 33 and on the guide casing 2 is preferably set equal to heat the yarn 34. For example, in a shrinkage treatment, the surface temperature could be in the range of 200 ° C.

However, it is also possible to combine the take-off godet unit 27 with a driven galette and heated godet casing with the device according to the invention. This design is in Fig. 3 shown in dashed lines.

LIST OF REFERENCE NUMBERS

1

leadership

2

guide sheath

3

axle

4

air bearing

5

air gap

6.1, 6.2

annular chamber

7

sliding jacket

8th

Compressed air connection

9

Compressed air duct

10

distribution bore

11.1, 11.2

thrust ring

12.1, 12.2

radial gap

13

rack end

14

heating

15

Compressed air line

16

Compressed air source

17

heating coil

18

heating control

19

temperature sensor

20

Compressed air heater

21

nozzle bores

22

orifices

23

spinning head

24

spinneret

25

cooling shaft

26

filament bundles

27

Abzugsgaletteneinheit

28

godet

29.1, 29.2

Galette

30

cold leadership

31

bearing section

32

melting feed

33

heated godet coat

34

thread

Claims (14)

1. Method for heating a rotatably mounted guide casing of a guide roller for guiding and heating threads, in which the guide casing is held on the circumference of an axle support by means of an air bearing,
   characterized in that
   compressed air is heated outside the guide roller, and the heated compressed air is supplied to the air bearing for the guide casing.
2. Method according to Claim 1,
   characterized in that
   the compressed air is heated in a separate compressed air heater, which is supplied with the compressed air from a compressed air source.
3. Method according to Claim 1 or 2,
   characterized in that
   the compressed air is heated to a setpoint temperature, an actual temperature of the compressed air is detected, and the heating of the compressed air is regulated as a function of a deviation between the setpoint temperature and the actual temperature.
4. Method according to one of Claims 1 through 3,
   characterized in that
   the heated compressed air within the guide roller is distributed by means of a porous sliding casing in an air gap of the air bearing.
5. Method according to one of Claims 1 through 3, characterized in that the heated compressed air within the guide roller is distributed in an air gap of the air bearing via multiple nozzle holes.
6. Device for carrying out the method according to one of Claims 1 through 5, having a guide roller (1) which has a rotatably mounted guide casing (2) and an axle support (3), an air bearing (4) being provided between the guide casing (2) and the axle support (3) and being coupled to a compressed air source (16) via a compressed air line (15),
   characterized in that
   a heating means (14) by which compressed air may be heated is associated with the compressed air line (15) outside the guide roller (1).
7. Device according to Claim 6,
   characterized in that
   the heating means (14) is formed by an electric compressed air heater (20) which is connected in the compressed air line (15) between the compressed air source (16) and a compressed air connection (8) for the guide roller (1).
8. Device according to Claim 6 or 7,
   characterized in that
   a heat control system (18) which is connected to a temperature sensor (19) for detecting an actual temperature of the heated compressed air is associated with the heating means (14).
9. Device according to one of Claims 6 through 8,
   characterized in that
   the air bearing (4) is formed by an air gap (5) between the guide casing (2) and a porous sliding casing (7), the sliding casing (7) being held at the circumference of the axle support (3), at which at least one annular chamber (6.1, 6.2) which is connected to the compressed air connection (8) is provided.
10. Device according to Claim 9,
    characterized in that
    the sliding casing (7) is formed from an open-pore sintered metal or sintering coal.
11. Device according to one of Claims 6 through 8,
    characterized in that
    the air bearing (4) is formed by an air gap (5) between the guide casing (2) and the axle support (3), the axle support (3) having multiple nozzle openings (22) at the circumference which are connected to the compressed air connection (8) and which open into the air gap (5).
12. Device according to one of Claims 6 through 11,
    characterized in that
    the guide casing (2) has a hollow cylindrical design and has a thrust ring (11.1, 11.2) at each of the two ends, the thrust rings (11.1, 11.2) being connected to the guide casing (2) in a rotationally fixed manner and delimiting the air gap (5) of the air bearing (4) toward both end faces.
13. Use of a device according to one of Claims 6 through 12 in a melt spinning device, in which one or more threads (34) are guided through multiple godets (29.1, 29.2), heated, and stretched, at least one of the godets (29.1, 29.2) cooperating with the guide roller (1) in order to guide the thread (34).
14. Use according to Claim 13,
    characterized in that
    a godet casing (33) of the godet (29.2) and the guide casing (2) of the guide roller (1) are heated to the same surface temperature.

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