EP1805358B1 - Galette for guiding, heating and transporting a thread - Google Patents

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

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

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

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 guided on the circumference of the godet roll thread is heated by contact. For heating, the thread or several parallel adjacent threads is preferably performed several times, each with a Teilumschlingung over the godet shell, wherein the parallel juxtaposed partial loops of the thread or the threads are within a heated occupation length of the godet shell. In this case, it is of particular importance 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 casing is heated by an induction heater. For this purpose, a plurality of induction coils are arranged on a carrier, which protrudes 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 flux currents are induced within the godet casing, which lead to a heating of the godet casing.

It has been found, however, that when inductive heating of the godet shell, the induced magnetic fields only heat the immediate inner edge zones of the godet shell. 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 heat conductivity of the godet casing.

From the GB 1 150 460 as well as from the WO 02/052078 A1 Galetten are known in which the godet shell is heated by an external heater. The heater is formed by a radiant heater whose radiant energy is transmitted by convection to the godet shell. Due to the high peripheral speeds and the associated high air flows such heaters are associated with high losses. On the other hand, a control for setting certain surface temperatures on the godet casing hardly feasible, especially in the peripheral areas of the godet shell higher heat losses occur by heat conduction.

From the WO 02/055772 A1 a godet for guiding, heating and conveying a yarn with a rotatably driven hollow cylindrical godet casing is known, which is rotatably mounted on a support. The godet casing is heated with an electric heater which is disposed within the hollow cylindrical godet casing and fixedly connected thereto.

Moreover, from the DE 22 49 519 A1 a heated roller with a rotating, drivable hollow cylindrical godet casing is known, which is rotatably mounted on a support. The godet mantle is heated with an induction heater surrounding the godet mantle over its entire circumference. To heat the godet over its entire length, the roller has under its working surface distributed over the circumference, axially extending and sealed chambers with liquid filling on.

It is an object of the invention to develop a generic godet in such a way that the heating of the godet jacket as low loss as possible with sensitive and responsive controllability of the surface temperature of the godet shell takes place.

Another object of the invention is to provide a generic godet; in which the lowest possible thermal load of the other godet components takes place.

The object is achieved according to the invention for a godet in that the induction heater is formed outside of the godet casing, induction coils extend over a shell segment with a circumferential angle in the range of 20 ° to 180 preferably in the range of 40 ° to 130 ° on godet casing and the induction coils themselves extend substantially over the entire length of the godet shell.

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 the US 4,675,487 or the DE 102 09 544 A1 It is known that for the treatment of paper webs calender rolls by means of an external induction heater to be heated. Due to the large temperature range in the US 4,675,487 is specified at 70 ° C to 100 ° C, this temperature irregularities 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 treated.

In the treatment of synthetic threads, however, it is necessary that the surface temperature of the godet jacket is constant as possible over the entire occupancy length. Especially when a plurality of threads are guided on a godet jacket, larger temperature differences would lead directly to different physical properties of the produced threads. 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 shell by the known solutions of the US 4,675,487 as well as the DE 102 09 544 A1 strengthened.

However, the invention surprisingly revealed that due to the relatively high peripheral speeds of the godet casing in the range of 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 considerably worsened compared to the interior of the godet casing by, for example, preparation vapors, did not adversely affect the induction heating device formed outside the godet jacket.

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 load is considerably reduced in the interior of the godet shell especially in the bearings. The structural design for attaching the godet shell to a carrier can thus be formed exclusively according to storage technology.

Due to the high peripheral speeds of the godet casing required for the yarn treatment, it has been shown that the induction coils of the induction heater extend exclusively over a shell 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 sheathing can be realized by the heating device, wherein a part of the induction coil is preferably held to a movable support for this purpose.

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

The induction coils are preferably held parallel to the godet casing for a plurality of side by side in the axial direction and 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, in which the induction coils are combined to form a plurality of heating zones and in which the induction coils assigned to one of the heating zones can be controlled jointly and independently of the adjacent induction coils of adjacent heating zones. 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. Thus, the windings can advantageously hold U-shaped cut cores whose poles extend congruent in the axial direction with a constant distance to the godet casing.

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

The distance between the pole ends of the induction coil and the godet shell is substantially constant, with a favorable magnetization of the godet shell is 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 feasible 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 support plate is mounted on an axially spaced from the godet extending pivot axis, can be advantageous to the on 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.

To maintain a certain 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. Thus, the induction heater can be integrated into a control loop, by which a predetermined surface temperature of the godet casing is adjustable and continuously trackable 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.

If a plurality of heating zones are used 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 controlled independently of one another via the heating controller in terms of its surface temperature.

In the following some embodiments of the godets according to the invention are described with reference to the accompanying drawings.

Fig. 1 und Fig. 2

schematisch mehrere Ansichten eines ersten Ausführungsbeispiels der erfindungsgemäßen Galette

Fig. 3 und Fig. 4

schematisch mehrere Ansichten eines weiteres Ausführungsbeispiels der ' erfindungsgemäßen Galette

Fig. 5

schematisch eine Ansicht eines weiteren Ausführungsbeispiels der erfin- dungsgemäßen Galette

They show:

Fig. 1 and Fig. 2

schematically several views of a first embodiment of the godet according to the invention

FIG. 3 and FIG. 4

schematically several views of another embodiment of the invention Galette

Fig. 5

schematically a view of another embodiment of the inventive godet

In Fig. 1 and 2 a first embodiment of the godet according to the invention is shown in several views. This shows Fig. 1 schematically a cross-sectional view and Fig. 2 schematically a front view. Unless an explicit 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 cup-shaped at one end by an end wall 4. On the opposite side of the end wall 4 of 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 bearings 6.1 and 6.2 are provided in the carrier 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 heater has a plurality of induction coils in the axial direction and radial direction next to each other.

As in Fig. 1 is shown, 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 as Schnittbandkerne 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 one behind the other in the radial direction. 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.

In the Fig. 1 and Fig. 2 illustrated induction heater 8 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 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 terminal 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 are jointly controllable. The group of induction coils of a heating zone can be independently of control the induction coils of the adjacent heating zone. Thus, in the case of operation, for example, a predetermined surface temperature of the godet casing 1 can be specified. 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. This can be set and maintained over the entire occupancy length of the godet 1 substantially constant surface temperature.

As in Fig. 2 is shown, induced induction heating is effected by the induction heater 8 only in an angular range of the godet 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 in the treatment of filaments consistently above 1000 m / min. lie. Due to the high peripheral speed of the godet casing 1, a uniform heating of the entire circumference of the godet casing 1 by the induction heater 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. Depending on the yarn treatment and yarn type, the surface temperature of the godet casing 1 can be in the range of 60 ° C. to 250 ° C., the deviations of the surface temperatures over the entire coating area of the godet casing in the range of <2 ° C. being preferably <1 ° C. ,

In Fig. 3 and 4 a further embodiment of the Galette invention is shown schematically in several views. In Fig. 3 the embodiment is in a cross-sectional view and in Fig. 4 shown in a front view. Inasmuch as no reference is made to one of the figures, the following description applies to both figures.

In the in the Figures 3 and 4 shown embodiments, the godet 1 on both end faces in each case an end wall 4.1 and 4.2. The end walls 4.1 and 4.2 are rotatably mounted directly on an axis 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 central region. The electric motor 7 has a stationary stator 20 and an annular rotor 21 surrounding the stator 20. Between the stator 20 and the rotor 21, an air gap is formed. 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 guided 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 in Fig. 3 shown, two induction coils are arranged side by side 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 in FIG Fig. 4 shown. Thus, the induction heater 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 heater 8 are controlled in common in this embodiment, a heating controller 11. This is the heating controller 11 is connected to a supply terminal 14 with the induction coils.

The induction coils are arranged on a holder 16. For this purpose, the winding support 23 are fixedly connected via spacers 17 to the holder 16. The holder 16 is shaped like a shell at a distance congruent to the godet casing 1 and held cantilevered on the carrier 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 in Fig. 3 shown - and a rest position is adjustable back and forth.

For controlling and regulating 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.

This in Fig. 3 and 4 illustrated embodiment of the godet according to the invention is identical in function to the previous embodiment according to Fig. 1 and 2 so that reference is made to the aforementioned embodiment at this point. In this case, at least one thread or a plurality of threads are also stirred on the circumference of the godet casing 1. The godet casing 1 is driven by the electric motor 7 in the interior of the godet casing 1. The godet casing 1 is heated via the arranged outside of the godet 1 induction heating device 8. To control a surface temperature of the godet casing two temperature sensors 12.1 and 12.2 of the heating control 11 are assigned. The energization of the induction coils 9.1, 9.2, that a substantially constant surface temperature is adhered to the godet 1.

In Fig. 5 a further embodiment of a godets according to the invention is shown. The components with identical functions have the same reference numerals in the following description as in Fig. 1 and 2 receive. In addition, the structure of in Fig. 5 Galette shown essentially identical to that in Fig. 1 and 2 shown in the following description essentially only the differences are explained and otherwise to the previous description of the Fig. 1 and 2 Reference is made.

According to the embodiment Fig. 5 the induction coils 9 of the induction heater 8 are held together on a half-shell-shaped support plate 25, which is held congruent to the godet casing 1. The support plate 25 extends in the circumferential direction over an angular range of approximately 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 in Fig. 5 shown - 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 pivot axis 27. The cover plate 26 is shaped like a half shell congruent to the godet casing 1 and extends substantially over the entire longitudinal region of the godet casing 1 and on the circumference over an angular range of approximately 90 °. Thus, both the support plate 25 and the cover plate 26 during operation of the galette form 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 in the Fig. 1 to 5 illustrated embodiments of the godet according to the invention, the electronic components and electrical connections of the induction heating device are insulated and formed encapsulated to the outside, in particular to avoid environmental influences caused by, for example, the filaments preparation fumes and mist. Thus, the godet invention can be used advantageously even in very unfavorable environmental areas of a spinning.

LIST OF REFERENCE NUMBERS

1

godet

2

carrier

3

wave

4,4.1,4.2

bulkhead

5

hub

6.1,6.2

camp

7

electric motor

8th

induction heating

9.1, 9.2, 9.3, 9.4

induction coil

10, 10.1, 10.2

poling

11

heating control

12.1, 12.2, 12.2, 12.4

temperature sensor

13

A signal transmitter

14

supply terminal

15

supply lines

16

holder

17

spacer

18.1, 18.2, 18.3, 18.4

heating zone

19

signal line

20

stator

21

rotor

22

winding

23

winding support

24

axis

25

support plate

26

Cover plate

27

swivel axis

Claims (11)

1. Godet for guiding, heating and transporting a thread with a rotatably drivable hollow cylindrical godet jacket (1), which is rotatably mounted on a carrier (2), and with an induction heating device (8) which is arranged for heating the godet jacket (1) with a plurality of induction coils (9.1, 9.2) spaced from the godet jacket (1), characterised in that the induction heating device (8) is located outside the godet jacket (1), the induction coils (9.1, 9.2) extend on the godet jacket (1) over a jacket segment with a circumferential angle in the range from 20 to 180°, preferably in the range from 40° to 130° and the induction coils (9.1, 9.2) extend substantially over the whole length of the godet jacket (1).
2. Godet according to claim 1, characterised in that the induction coils (9.1, 9.2) extend next to one another in the axial direction and/or in the radial direction parallel to the godet jacket (1).
3. Godet according to one of claims 1 to 2, characterised in that the induction coils (9.1, 9.2) are combined to form a plurality of heating zones (18.1, 18.2) and that the induction coils (9.1, 9.2) associated respectively with the heating zones (18.1, 18.2) can be controlled jointly and independently with respect to the adjacent induction coils (9.1, 9.2) of adjacent heating zones (18.1, 18.2).
4. Godet according to one of claims 1 to 3, characterised in that the induction coils (9.1, 9.2) comprise in each case two pole ends (10.1, 10.2) that extend in the axial direction congruently at a constant distance from the godet jacket (1).
5. Godet according to one of claims 1 to 3, characterised in that the induction coils (9.1, 9.2) comprise in each case two pole ends (10.1, 10.2) that extend in the radial direction congruently at a constant distance from the godet jacket (1).
6. Godet according to claims 4 or 5, characterised in that the distance between the pole ends (10.1, 10.2) of one of the induction coils (9.1, 9.2) and the godet jacket (1) is in the range from 1mm to 6mm.
7. Godet according to one of the preceding claims, characterised in that the induction coils (9.1, 9.2) are held on a half-shell shaped metal carrier sheet (25) and that the metal carrier sheet (25) together with the induction coils (9.1, 9.2) is movably held between an operating position and a rest position.
8. Godet according to claim 6, characterised in that the metal carrier sheet (25) is mounted on a swivelling axis (27) extending axially and spaced from the godet jacket (1), and that the swivelling axis (27) carries a metal cover sheet (26) on the opposite jacket side to the metal carrier sheet (25).
9. Godet according to one of the preceding claims, characterised in that the induction heating device (8) is connected to a heating control unit (11), and that the heating control unit (11) is coupled to at least one temperature sensor (12.1) that measures a jacket temperature of the godet jacket (1).
10. Godet according to claim 8, characterised in that the temperature sensor (12.1) is secured to the godet jacket (1) and is connected by a signal transmitter (23) to the stationary heating control unit (11).
11. Godet according to claim 8 or 9, characterised in that a plurality of temperature sensors (12.1, 12.2) are provided, in which one of the plurality of heating zones (18.1, 18.2) on the godet jacket (1) is associated respectively with each of the temperature sensors (12.1, 12.2).

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