EP1805358A1

EP1805358A1 - Galette for guiding, heating and transporting a thread

Info

Publication number: EP1805358A1
Application number: EP05796004A
Authority: EP
Inventors: Jürgen Gärtner; Arnulf Sauer; Klaus Schäfer
Original assignee: Saurer GmbH and Co KG
Current assignee: Oerlikon Textile GmbH and Co KG
Priority date: 2004-10-14
Filing date: 2005-10-07
Publication date: 2007-07-11
Anticipated expiration: 2025-10-07
Also published as: DE502005011168D1; EP1805358B1; CN102560798A; ATE503047T1; JP4718555B2; CN101040074A; JP2008517164A; WO2006042646A1

Abstract

The invention relates to a galette for guiding, heating and transporting a thread, said galette comprising a rotating, driveable, hollow cylindrical galette jacket. An induction heating device is provided for heating the galette jacket, said device comprising a plurality of induction coils arranged at a distance from the galette jacket. The aim of the invention is to influence the heating of the galette jacket as directly and instantaneously as possible. To this end, the induction device is arranged outside the galette jacket (1).

Description

Galette for guiding, heating and conveying a thread

The invention relates to a godet for guiding, heating and conveying a Fa¬ dens according to the preamble of claim 1.

A generic galette is known for example from WO 97/49265 (= US 5,979,592).

In spinning or textile machines such godets are used for heating, conveying and guiding a thread. In this case, a rotating godet jacket is heated, so that the thread guided on the circumference of the godet jacket is heated by contact. For heating, the thread or a plurality of parallel juxtaposed threads is preferably passed several times, each with a Teilumschlingung over the godet casing, wherein the parallel nebenein¬ other partial convolutions of the thread or threads are within a heated occupation length of the godet shell. In this case, it is particularly important that the godet casing has a uniform surface temperature over the entire application length in order to obtain a defined heating of the thread or of the threads. In the known godets, the godet jacket is heated by an induction heater. For this purpose, a plurality of induction coils are arranged on a carrier projecting projecting into the cup-shaped godet casing. In this case, an inner circumferential air gap is formed between the godet casing and the induction coils. Due to the magnetic flow, currents are induced within the godet casing which lead to heating of the godet casing.

However, it has been shown that in inductive heating of the godet shell, the induced magnetic fields only the immediate inner edge zones of the

Warm up godet coat. Due to the thermal conductivity of the godet shell, the heat is then distributed throughout the godet coat. Thus, the on The surface temperatures entering the outer surface of the godet casing essentially depend on the thermal conductivity of the godet casing.

From GB 1 150 460 and WO 02/052078 Al godets are known in which the godet shell is heated by an external heater. The heating device is formed by a radiant heater whose radiation energy is transferred by convection to the godet casing. Due to the high peripheral speeds and the associated high Luftströ¬ regulations such heaters are associated with high losses. On the other hand, a control system for setting certain surface temperatures on the godet casing is hardly feasible, especially since higher heat losses through heat conduction occur in the edge regions of the godet casing.

It is an object of the invention to further develop a generic godet in such a way that the heating of the godet mantle is as low-loss as possible with a finely tuned and responsive controllability of the surface temperature of the godet mantle.

A further object of the invention is to provide a generic godet in which the lowest possible thermal load on the other fork components takes place.

The object is achieved according to the invention for a godet by the fact that the induction heating device is formed outside the godet casing.

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

The invention was also not obvious that, for example, from US 4,675,487 or DE 102 09 544 Al is known that for the treatment of

Paper webs calender rolls by means of an external induction heating be heated. Due to the large temperature range, which is specified in US 4,675,487 with 70 ° C to 100 ⁰ C, this temperature unevenness remain on the surface of the calender roll, which inevitably inevitably set by the relatively low peripheral velocities and the only locally acting inductance , without effect on the paper web to be handled.

In the treatment of synthetic threads, however, it is necessary that the surface temperature of the godet shell is constant as far as possible over the entire length Being. Especially when a plurality of threads are guided on a gilet jacket, larger temperature differences would lead directly to different physical properties of the threads produced. In that regard, temperature differences on the surface of the godet shell of <2 ° C are desired. In that regard, the reservation for heating a godet jacket by the known solutions from US 4,675,487 and DE 102 09 544 Al was strengthened.

However, the invention surprisingly revealed that, due to the relatively high peripheral speeds of the godet casing in the range from 1,000 m / min up to 6,000 to 8,000 m / min, a substantially constant surface temperature was established. In addition, it has been found that the environmental conditions, which are considerably worsened compared to the interior of the godet casing, for example, due to preparation vapors, did not adversely affect the induction heating device formed outside the godet casing.

The invention also has the particular advantage that the inductively generated heat is generated directly in the outer peripheral layer of the godet casing, so that a direct influence of the yarn treatment temperature by the induction heater is possible without taking into account any heat conduction in the godet casing. In addition, the heating induced directly in the outer edge layers of the godet mantle causes the heat tion is considerably reduced in the interior of the godet shell, especially in the bearing points. The constructive structure for attaching the godet shell to a carrier can thus be trained exclusively according to storage technology.

Due to the high peripheral velocities of the godet jacket required for the yarn treatment, it has been found that the induction coils of the induction heater extend exclusively over a jacket segment with a circumferential angle in the range of 20 ° to 180 °, preferably in the range of 40 ° to 130 °. Thus, the operation of the godets remains unaffected by the application of multiple threads. However, the induction coils can extend for intensification over a larger circumferential angle of> 180 °. In special cases, even complete cladding can be realized by the heating device, whereby a part of the induction coil is preferably held on a movable support for this purpose.

To utilize and to form the longest possible occupancy lengths on the lattice mantle, the induction coils are preferably distributed over the entire length of the godet mantle. Thus, it is preferable to lead several threads simultaneously on a galette, heat and challenge. In principle, however, it is also possible to carry out the heat distribution in the godet casing by means of the godet casing. In this case, the induction coils extend only over a partial length of the godet casing.

In this case, the induction coils are preferably held parallel to the godet casing for a plurality of side by side in the axial direction and in the radial direction. As a result, the induction heating device can be operated with high alternating current frequencies of at least 50 Hz, preferably of more than 500 Hz.

Since known heat losses occur at the ends of the godet casing, the advantageous development of the invention is preferably used, wherein the induction coils are combined into a plurality of heating zones and in which are jointly and independently to the adjacent induction coils of adjacent heating zones steu ^¬ Erbar one of the heating zones associated induction coils. Thus, in particular the edge zone of the godet jacket can be formed towards the front sides with a higher power density.

In this case, induction coils with windings are preferably carried out, which have a directed in the longitudinal direction of the godet roll winding. In this way, the windings can advantageously be held on U-shaped cut-strip cores whose ends extend congruently in the axial direction at a constant distance from the godet casing.

However, it is also possible to form induction coils with windings in the circumferential direction. In this case, the opposing poles of an induction coil extend congruently in the radial direction at a constant distance from the godet casing.

The distance between the pole ends of the induction coils and the godet sleeve is essentially constant, a favorable magnetization of the godet jacket being given by a distance of <5 mm, preferably <3 mm, between the pole end and the godet shell.

According to a particularly advantageous embodiment of the invention, the induction coils are held on a half-shell-shaped support plate, which is guided with the induction coil between an operating position and a rest position. Thus, maintenance work can be performed on the induction heater in a simple manner.

In the event that the carrier sheet is mounted on a pivot axis extending axially with distance to the godet casing, it is advantageously possible to use an on the Attach the opposite side of the jacket to the support plate to pivot the cover plate to provide the godet casing with a protective cover.

In order to maintain a specific surface temperature on the godet casing, the induction heating device is preferably connected to a heating control, which in turn is coupled to at least one temperature sensor which detects a current jacket temperature of the godet casing. In this way, the induction heating device can be integrated into a control loop, by means of which a predetermined surface temperature of the godet casing can be set and continuously fed during operation.

The temperature sensor is therefore preferably attached directly to the godet casing, wherein the sensor signals from the rotating godet casing for stationary heating control via a signal transformer for heating control are performed.

When using a plurality of heating zones on the godet casing, each of the heating zones is advantageously assigned a respective temperature sensor, so that each of the heating zones can be regulated independently of one another via the heating control in its surface temperature.

In the following, some embodiments of the invention Galet- th will be described with reference to the accompanying drawings.

They show:

Fig. 1 and

2 schematically shows several views of a first exemplary embodiment of the godet according to the invention, FIG. 3 and FIG. 4 shows a schematic view of a further embodiment of the godet according to the invention Fig. 5 shows schematically a view of another embodiment of the inventions ^{¬ to the} invention galette

In Fig. 1 and 2, a first embodiment of the godet according to the invention is shown in several views. FIG. 1 shows schematically a cross-sectional view and FIG. 2 shows a schematic front view. Insofar as no express reference is made to one of the figures, the following description applies to both figures.

The godet has a hollow cylindrical godet casing 1, which is formed topfpfig at one end by an end wall 4. On the opposite side of the end wall 4, the godet casing 1 is open. The end wall 4 of the godet casing 1 is connected to a hub 5 which is rotatably mounted on the circumference of a shaft 3. The shaft 3 is cantilevered on a laterally arranged next to the godet roller carrier 2 rotatably mounted. For this purpose, the bearing 6.1 and 6.2 are provided in the Trä¬ ger 2. On the side facing the godet 1 side of the carrier 2, the shaft is coupled to an electric motor 7. The shaft 3 penetrates the electric motor 7 and has a free end, on which a signal transformer 13 is arranged.

For heating the godet casing 1, an induction heating device 8 is provided outside of the godet casing 1. In this case, the induction heating device has a plurality of induction coils in the axial direction and in the radial direction next to one another.

As shown in Fig. 1, a total of four induction coils 9.1, 9.2, 9.3 and 9.4 are arranged axially adjacent to each other. Each of the induction coils 9.1 to 9.4 is formed in each case by a winding 22 and a U-shaped winding support 21 with the pole ends 10.1 and 10.2. The U-shaped winding carriers 21 are preferably cut-strip cores with several Trafo sheets formed. Each of the induction coils 9.1 to 9.4 is connected in each case via a spacer 17 with a holder 16. The holder 16 is firmly connected on one side with the carrier 2.

The induction coils 9.1 to 9.4 are held by the holder 16 relative to the godet casing 1 such that between the godet casing 1 and the pole ends 10.1 and 10.2, a substantially constant distance over the entire length of the godet casing 1 sets. The distance may in this case be in the range of <5 mm, preferably <3 mm.

As a Fig. 2 is shown, a total of four induction coils 9.1, 9.5, 9.6 and 9.7 are arranged in the radial direction one behind the other. In this case, the winding carriers 21 of the induction coils 9.1, 9.5 to 9.7 are arranged relative to one another such that the pole ends 10 are each held at a constant distance from the surface of the godet casing 1. The holder 16 is for this purpose arcuately formed substantially congruent to the godet casing 1.

The hiduktionsheizeinrichtung 8 shown in Fig. 1 and Fig. 2 is formed with the induction coils to several heating zones 18.1, 18.2, 18.3 and 18.4. In this case, the induction coils arranged one behind the other in the radial direction each form a heating zone.

As in -Fig. 1, each of the heating zones 18.1 to 18.4 is assigned a respective temperature sensor 12.1 to 12.4. The temperature sensors 12.1 to 12.4 are mounted within the godet casing 1 and coupled via signal lines 19 to the signal transmitter 13. The stationary part of the signal transmitter 13 is connected to a heating controller 11. The heating control 11 is connected via a plurality of supply lines 15 to a supply connection 14 associated with the induction coils. By means of the heating control 11, the induction coils 10 assigned to the heating zones 18.1 to 18.4 can be jointly controlled. Da¬ can be the group of induction coils of a heating zone regardless of control the induction coils of the adjacent heating zone. So can be the Be ^¬ operating case, for example, a predetermined surface temperature of the godet shell 1 dictate. Each deviating actual temperature registered by the temperature sensors 12.1 to 12.4 can thus be advantageously compensated individually by the heating control 11 in each of the heating zones 18.1 to 18.4. In this way, it is possible to set and maintain a surface temperature which is essentially constant over the entire length of use of the godet casing 1.

As shown in FIG. 2, induced heating is effected by the induction heater 8 only in an angular range of the godet casing 1. The induction heater 8 extends over an angular range of about 120 °.

In operation, the godet casing 1 is driven by the electric motor 7 and the shaft 3 to peripheral speeds, which are in the treatment of filaments consistently above 1,000 m / min. Due to the high circumferential speed of the godet casing 1, uniform heating of the entire circumference of the godet casing 1 by the induction heating device 8 is achieved. Depending on the peripheral speed of the godet casing, the angular range which is detected by the induction heater 8 on the godet casing 1, optionally in the range between 20 ° to 180 ° form. The surface temperature of the godet casing 1 can, depending on the filament treatment and type of yarn in the range of 60 ⁰ C to 250 ° C amount, the deviations of the surface temperature over the entire Belegungsbe- region of the godet casing in the range of <2 ° C, preferably <1 ° C is.

In Fig. 3 and 4, a further exemplary embodiment of the invention gilette is shown schematically in several views. FIG. 3 shows the embodiment in a cross-sectional view and in FIG. 4 in a front view. Insofar as no reference is made to one of the figures, the following description applies to both figures. In the exemplary embodiments shown in FIGS. 3 and 4, the godet jacket 1 has in each case an end wall 4.1 and 4.2 on both end faces. The end walls 4.1 and 4.2 are rotatably mounted directly on an axle 24 via the bearings 6.1 and 6.2. The axis 24 is projectingly connected to the carrier 2. Between the end walls 4.1 and 4.2, an electric motor 7 is preferably arranged within the godet casing 1 in the middle region. The electric motor 7 has a stationary stator 20 and an annular stator 21 surrounding the stator 20. An air gap is formed between the stator 20 and the rotor 21. The rotor 21 is fixedly connected to the godet casing 1. The stator 20 is fixed to the axle 24. The supply of the stator 20 is effected by supply lines, which are led through the axis 24 to the outside. For this purpose, the axis 24 is formed as a hollow cylinder.

Outside the godet casing 1, the induction heating device 8 is arranged, which has a plurality of spaced apart from the godet casing 1 induction coils 9.1 and 9.2. The induction coils are each formed by a winding carrier 23 and a winding 22. Here, the pole ends 10 of the winding carrier 23 are aligned in the longitudinal direction of the godet casing. The windings 22 are wound on the winding carrier 23 with a longitudinal direction of winding.

As shown in FIG. 3, two induction coils are arranged next to each other in the longitudinal direction on the godet casing. Each of the induction coils 9.1 and 9.2 has two adjacent induction coils in the circumferential direction, as shown in FIG. 4. Thus, the mduktionsheizeinrichtung 8 is formed in total by six induction coils extending in the circumferential direction over an angular range of about 90 ° on the godet casing 1. In the longitudinal direction, the induction heater 8 extends substantially to the end walls 4.1 and 4.2. The induction coils of the induction heating unit 8 are jointly controlled in this embodiment via a heating control 11. This is the heating control 11 is connected to a supply port 14 with the Induktionsspu ^¬ len.

The induction coils are arranged on a holder 16. For this purpose, the wokkelträger 23 via spacers 17 to the holder 16 are firmly connected. The holder 16 is formed halbschalenfδrmig at a distance congruent to the godet casing 1 and cantilevered to the support 2. The connection between the holder 16 and the carrier 2 is designed to be movable, so that the holder 16 between an operating position - as shown in Fig. 3 - and a rest position is adjustable back and forth.

To control and regulate the surface temperature of the godet casing 1, two temperature sensors 12.1 and 12.2 are arranged on the godet casing 1, which are connected to a signal transmitter 13 in the interior of the godet casing 1. The signal transmitter 13 is fixed with its non-rotating part on the axis 24 and connected via signal lines to the heating controller 11.

The embodiment of the gillette according to the invention shown in FIGS. 3 and 4 is identical in function to the preceding embodiment according to FIGS. 1 and 2, so that reference is made to the above-mentioned embodiment at this point. At the same time, at least one thread or several threads are guided on the circumference of the godet sleeve 1. The godet shell 1 is driven by the electric motor 7 in the interior of the godet casing 1. The godet casing 1 is heated via the induction heating device 8 arranged outside the godet casing 1. To control a surface temperature of the godet casing, two temperature sensors 12.1 and 12.2 are assigned to the heating controller 11. The energization of the induction coils 9.1, 9.2, etc., takes place in such a way that a substantially constant surface temperature is maintained at the godet casing 1. FIG. 5 shows a further embodiment of a godet according to the invention. The components with identical functions have also been given the same reference numerals in FIGS. 1 and 2 as in the following description. In addition, the construction of the godet shown in FIG. 5 is substantially identical to the godets shown in FIGS. 1 and 2, so that in the following description, essentially only the differences are explained and otherwise to the vorher¬ outgoing description of FIGS. 1 and 2 is referred to.

In the exemplary embodiment according to FIG. 5, the induction coils 9 of the induction heating device 8 are held together on a half-shell-shaped support plate 25, which is held congruent to the godet casing 1. The carrier sheet

25 extends in the circumferential direction over an angular range of about 90 °. At one end of the support plate 25, a pivot axis 27 is arranged, which extends in the axial direction parallel to the godet casing 1. The pivot axis 27 is cantilevered with one end to the carrier 2. The support plate 25 is connected to the pivot axis 27 such that the support plate 25 between an operating position - as shown in Fig. 5 - or a rest position can be adjusted.

On the side opposite the support plate 25 side of the pivot axis 27, a cover plate 26 is provided, which is also pivotally connected to the Schwenk¬ axis 27. The cover plate 26 is shaped like a half-shell in a congruent manner to the godet casing 1 and extends essentially over the entire longitudinal area of the godet casing 1 and on the circumference over an angular range of approximately 90 °. Thus form both the support plate 25 and the cover plate

26 during operation of the galette a protective jacket to the outside. This can on the one hand heat losses avoided and on the other hand air flows are positively influenced to thread guide. In addition, there is protection against external influences or impermissible interventions. In the exemplary embodiments of the godet according to the invention shown in FIGS. 1 to 5, the electronic components and electrical connections of the induction heating device are insulated and encapsulated to the outside in order to avoid in particular environmental influences by, for example, preparation fumes and mist produced by the threads. Thus, the godet according to the invention can be advantageously used even in very unfavorable surrounding areas of a spinning mill.

LIST OF REFERENCE NUMBERS

1 godet coat

2 carrier 3 shaft

4, 4.1, 4.2 end wall

5 hub

6.1, 6.2 bearings

7 electric motor 8 induction heating device

9.1, 9.2, 9.3, 9.4 ... induction coil

10, 10.1, 10.2 Polende

11 heating control

12.1, 12.2, 12.2, 12.4 Temperature sensor 13 Signal transmitter

14 supply connection

15 supply lines

16 holders

17 Spacer 18.1, 18.2, 18.3, 18.4 Heating zone

19 signal line

20 ^• Stator

21 rotor

22 winding 23 winding carrier

24 axis

25 carrier sheet

26 cover plate

27 pivot axis

Claims

claims

1. Galette for guiding, heating and conveying a thread with a rotatably drivable hollow cylindrical godet casing (1), which is rotatably mounted on a support (2), and with an induction heating device (8) which is used to heat the godet casing (1). with a plurality of induction coils (9.1, 9.2) is arranged at a distance from the Galeten¬ tenmantel (1), characterized in that the induction heating device (8) outside of the godet casing (1) is formed.

2. Galette according to claim 1, characterized in that the induction coils (9.1, 9.2, ...) extend over a jacket segment with a circumferential angle in the range of 20 ° to 180 °, preferably in the range of 40 ° to 130 ° on the godet casing (1) extend.

3. godet according to claim 1 or 2, characterized in that the induction coils (9.1, 9.2, ...) extend substantially over the entire length of the godet casing (1).

4. godet according to one of claims 1 to 3, characterized in that the induction coils (9.1, 9.2, ...) to several nebeneinan¬ in the axial direction and / or in the radial direction parallel to the Ga¬ lettenmantel (1) extend.

5. Galette according to one of claims 1 to 4, characterized in that the induction coils (9.1, 9.2, ...) to a plurality of heating zones (18.1, 18.2, ...) are combined and that one of the heating zones (18.1, 18.2 , ...) associated induction coils (9.1, 9.2, ...) together and independently of the adjacent induction coils (9.1, 9.2, ...) be¬ nachbarter heating zones (18.1, 18.2, ...) are controllable.

6. Galette according to one of claims 1 to 5, characterized in that the induction coils (9.1, 9.2, ...) each have two pole ends (10.1, 10.2) which are congruent in the axial direction at a constant distance from the godet casing (10). 1) extend.

7. godet according to one of claims 1 to 5, characterized in that the induction coils (9.1, 9.2, ...) each have two pole ends (10.1, 10.2), which are congruent in the radial direction with constant distance to the godet shell ( 1) extend.

8. godet according to claim 6 or 7, characterized in that the distance between the pole ends (10.1, 10.2) len one of Induktionsspu¬ (9.1, 9.2, ...) and the godet casing (1) in the range of lmm to 6mm ,

9. godet according to one of the preceding claims, characterized gekenn¬ characterized in that the induction coils (9.1, 9.2, ...) are held on a haϊbscha- lenfÖrmigen carrier plate (25) and that the support plate (25) with the induction coils (9.1, 9.2) between a Betriebsstel¬ ment and a rest position is kept movable.

10. godet according to claim 8, characterized in that the Träger¬ sheet (25) is mounted on an axially spaced from the godet casing (1) _' extending pivot axis (27) and that the Schwenk¬ axis (27) on the opposite shell side to the support plate (25) carries a cover plate (26).

11. Galette according to one of the preceding claims, characterized in that the induction heating device (8) is connected to a heating control (11) and that the heating control (11) is connected to at least one temperature sensor (12.1) is coupled, which detects a Man¬ teltemperatur of the godet shell (1).

12. Galette according to claim 10, characterized in that the temperature sensor (12.1) attached to the godet casing (1) and by a

Signal transmitter (23) with the stationary heating control (11) is connected.

13. godet according to claim 10 or 11, characterized in that a plurality of temperature sensors (12.1, 12.2, ...) are provided, wherein each of the temperature sensors (12.1, 12.2, ...) one of a plurality of heating zones (18.1, 18.2,. ..) is assigned to the godet casing (1).