JP2008517164A - Godet for guiding, heating and conveying yarn - 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 galette for guiding, heating and transporting yarns of the type described in the superordinate conception of claim 1.

  Such a godet is known, for example, from WO 97/49265 (= US Pat. No. 5,795,592).

  In spinning machines or textile machines, godets of the type described above are used to heat, transport and guide the yarn. In this case, the rotating godet peripheral wall is heated, and thereby the yarn guided (guided) on the outer peripheral surface of the godet peripheral wall is heated by contact. For heating, a single yarn or a plurality of yarns running parallel to each other are guided in an advantageous manner, each partly wrapped around a godet wall, in which case one or a plurality of yarns The partial winding parts located side by side are located within the heated covering part length of the godet peripheral wall. In this case, in particular, the godet peripheral wall has a uniform surface temperature over the entire length of the covering portion, and heats one or more yarns at a prescribed temperature. In known godets, the godet peripheral wall is heated by an induction heating device. For this purpose, a plurality of induction coils are arranged on the support body, and this support body is cantilevered and enters the peripheral wall of the bowl-shaped godet. In this case, an annular air gap is formed on the inner side between the godet peripheral wall and the induction coil. The magnetic flux current induces a current for heating the godet peripheral wall in the godet peripheral wall.

  However, in induction heating of the godet peripheral wall, the induced magnetic field heats the edge region directly inside the godet peripheral wall. Next, based on the thermal conductivity of the godet peripheral wall, the godet peripheral wall heat is dispersed throughout the godet peripheral wall. As a result, the surface temperature generated on the outer peripheral surface of the godet peripheral wall substantially depends on the thermal conductivity of the godet peripheral wall.

  According to GB 1150460 and WO 02/052078, a godet is known in which the godet peripheral wall is heated by an external heating device. The heating device is formed by a radiation heater, and the radiation energy of the radiation heater is transmitted to the godet peripheral wall by convection. Due to the high peripheral speed and thus the high air flow, this type of heating device leads to high losses. On the other hand, control for adjusting a predetermined surface temperature in the godet peripheral wall can hardly be performed. Moreover, high heat loss is generated by the heat guide in the edge region of the godet peripheral wall.

  The object of the present invention is to improve the godet of the type described at the beginning so that the heating of the godet peripheral wall can be adjusted with a delicate and quick reaction, with as little heat loss as possible. It is to be.

  Another object of the present invention is to provide a godet of the type mentioned at the outset in which the heat load on the other godet components is as small as possible.

  According to the godet of the present invention, this problem has been solved by the fact that the induction heating device is configured outside the godet peripheral wall.

  Advantageous embodiments of the invention are defined by the features of the dependent claims and combinations of these features.

  The present invention heats a calendar roller by an induction heating device located outside to treat the web, as is known, for example, from U.S. Pat. No. 4,675,487 or DE 10209544. Therefore, it cannot be easily inferred. In this case, according to U.S. Pat. No. 4,675,487, temperature uniformity on the surface of the calender roller (relatively low) without acting on the web to be processed, based on a high temperature of 70 to 100 ° C. Automatically adjusted by the speed as well as the inductance acting only partly).

  However, when processing the synthetic yarn, it is necessary to make the surface temperature of the godet peripheral wall as uniform as possible over the entire contact length. In particular, when guiding a plurality of yarns on the godet peripheral wall, a large temperature difference will cause different physical properties of the produced yarns. Therefore, the temperature difference at the surface of the godet peripheral wall is desired to be <2 ° C. To that extent, the conditions for heating the godet peripheral wall are enhanced by US Pat. No. 4,675,487 or DE 10209544.

  According to the present invention, it has been found that a very constant surface temperature is adjusted based on a relatively high peripheral speed (1000 m / min to 6000 to 8000 m / min) of the godet peripheral wall. In addition, the ambient conditions caused by, for example, regulated steam, which are significantly deteriorated with respect to the inside of the godet peripheral wall, do not adversely affect the induction heating device formed outside the godet peripheral wall.

  In addition, since the heat generated in an inductive manner is generated in the outer edge layer of the godet peripheral wall, the direct influence of the yarn processing temperature by the induction heating device causes some heat pipes in the godet peripheral wall. It has the advantage that it is possible without taking into account. Further, the heat directly induced in the outer edge layer of the godet peripheral wall acts so that the heat load is remarkably reduced inside the godet peripheral wall, particularly at the bearing portion. Thereby, the structural configuration for attaching the godet peripheral wall to the support can be configured exclusively according to the viewpoint of bearing technology.

  Based on the high peripheral speed of the godet peripheral wall required for yarn treatment, the induction coil of the induction heating device has a circumferential angle in the range of 20 ° to 180 °, preferably 40 ° to 130 °. It extends over the peripheral wall arc of the peripheral wall. This ensures that the godet operation is not negatively affected by processing multiple threads. In a special case, it is also possible to enclose completely by means of a heating device, in which case a part of the induction coil is advantageously held on a movable support.

  In order to utilize and form as long a contact length as possible on the godet peripheral wall, the induction coil is advantageously distributed and arranged over the entire length of the godet peripheral wall. This advantageously allows a plurality of yarns to be simultaneously guided in the godet, heated and conveyed. However, basically, it is also possible to carry out the heat distribution in the godet peripheral wall by means arranged corresponding to the godet peripheral wall. In this case, the induction coil extends only over a part of the length of the godet peripheral wall.

  In this case, the plurality of induction coils are arranged and held in parallel with each other in the axial direction and the radial direction in parallel to the godet peripheral wall. This makes it possible to drive an induction heating device having a high alternating frequency of at least 50 Hz, preferably 500 Hz or more.

  Since it is known that high heat loss occurs at both ends of the godet peripheral wall, according to an advantageous embodiment of the invention, the induction coil is combined in a plurality of heating zones, one of the heating zones A plurality of induction coils arranged in correspondence with each other can be controlled in common and independently of adjacent induction coils. Thereby, especially the edge part area | region of a godet surrounding wall can be comprised with a higher power density toward an end surface side.

  In this case, an advantageous induction coil having one winding directed in the longitudinal direction of the godet peripheral wall is constructed. Therefore, the winding is held by a U-shaped band split core (Schnittbandkern), and the poles of the band split core are aligned with the godet peripheral wall at a certain distance from the godet peripheral wall. It extends in the axial direction.

  However, it is also possible to configure the induction coil with windings in the circumferential direction. In this case, the opposite polarities of the induction coil are spaced radially from the godet peripheral wall and extend in the radial direction so as to match the godet peripheral wall.

  The distance between the extreme part of the induction coil and the godet peripheral wall is almost constant, in which case good magnetisation of the godet peripheral wall is obtained by the distance between the extreme part and the godet peripheral wall <5 mm, preferably <3 mm. It is done.

  According to a particularly advantageous embodiment of the invention, the induction coil is held on a half-shell shaped supporting metal sheet, which can be guided between the working position and the non-working position together with the induction coil. Is retained. Thereby, the maintenance work of the induction heating apparatus can be performed in a simple form.

  If the supporting metal thin plate is supported by a pivot shaft that extends in the axial direction at a distance from the peripheral wall of the godet, it is advantageous that the pivot shaft is covered with a cover metal on the side of the peripheral wall opposite to the supporting metal thin plate. A thin plate is attached, whereby the godet peripheral wall has a protective cap.

  In order to maintain a predetermined surface temperature at the godet peripheral wall, the induction heating device is advantageously connected to a heating control unit, which heating control unit is connected to at least one temperature sensor, The peripheral wall temperature of the godet peripheral wall is detected. As a result, the induction heating device is connected to an adjustment circuit, which allows the predetermined surface temperature of the godet peripheral wall to be adjusted and can be continuously controlled during operation.

  The temperature sensor is thus advantageously fastened directly to the godet wall, in which case the sensor signal is transmitted from the rotating godet wall to the stationary heating control unit via a signal transmitter.

  When multiple heating zones are used for the godet peripheral wall, one temperature sensor is advantageously arranged in each of these heating zones, whereby each heating zone is independent of each other via a heating control unit. The surface temperature can be controlled.

  Embodiments of the godet according to the present invention will be described below with reference to the accompanying drawings.

1 and 2 are schematic views of a first embodiment of a galette according to the present invention as seen from different directions,
3 and 4 are schematic views of different embodiments of godets according to the present invention as seen from different directions,
FIG. 5 is a schematic diagram of another embodiment of a godet according to the present invention.

  FIGS. 1 and 2 show views of the godet according to the first embodiment of the present invention in different directions. In this case, FIG. 1 is a schematic cross-sectional view, and FIG. 2 is a schematic front view. The following description applies to FIGS. 1 and 2 unless otherwise indicated regarding which drawing.

  The godet has a hollow cylindrical godet peripheral wall 1. The godet peripheral wall 1 is formed in a bowl shape by an end wall 4 at one end. The godet peripheral wall 1 opposite to the end wall 4 is open. The end wall 4 of the godet peripheral wall 1 is coupled to a hub 5, and the hub 5 is coupled to the outer peripheral portion of the shaft 3 so as not to be relatively rotatable (that is, to rotate together). The shaft 3 protrudes in a cantilever manner and is rotatably supported on a support body 2 disposed adjacent to the side of the godet peripheral wall. For this purpose, the support 2 is provided with bearings 6.1 and 6.2. An electric motor 7 is connected to the support 2 on the side opposite to the godet peripheral wall 1. The shaft 3 passes through the electric motor 7 and has a free end, and a signal transmitter 13 is disposed at the free end.

  In order to heat the godet peripheral wall 1, an induction heating device 8 is provided outside the godet peripheral wall 1. In this case, the induction heating device 8 has a plurality of induction coils arranged side by side in the axial direction and the radial direction.

  As shown in FIG. 1, a total of four induction coils 9.1, 9.2, 9.3 and 9.4 are arranged side by side in the axial direction. In this case, these induction coils 9.1 to 9.4 extend substantially over the entire length of the godet peripheral wall 1. The induction coils 9.1 to 9.4 are each formed by one winding 22 and a U-shaped winding support 21 having extreme portions 10.1, 10.2. The U-shaped winding support 21 is configured as a strip-divided core (Schnittbandkern) with a plurality of laminated cores in an advantageous manner. Each induction coil 9.1 to 9.4 is connected to the holder 16 via a spacer 17. One side of the holder 16 is firmly connected to the support 2.

  The induction coils 9.1 to 9.4 are arranged between the godet peripheral wall 1 and the extreme portions 10.1, 10.2 so that a substantially constant distance is adjusted over the entire length of the godet peripheral wall 1. Is held relative to the godet peripheral wall 1. In this case, the spacing is configured to be in the range <5 mm, preferably 3 mm.

  As shown in FIG. 2, a total of four induction coils 9.1, 9.5, 9.6, 9.7 are arranged consecutively in the radial direction. In this case, the winding supports 21 of the induction coils 9.1, 9.5 to 9.7 are such that the extreme portions 10 are held at a certain distance from the outer peripheral surface of the godet peripheral wall 1, respectively. Are arranged with each other. For this purpose, the holder 16 is formed in an arch shape substantially matching the godet peripheral wall 1.

  The induction heating device 8 shown in FIGS. 1 and 2 includes a plurality of induction coils corresponding to a plurality of heating zones 18.1, 18.2, 18.3, and 18.4. In this case, each of a plurality of induction coils arranged continuously in the radial direction forms one heating zone.

  As shown in FIG. 1, one temperature sensor 12.1 to 12.4 is arranged corresponding to each heating zone 18.1 to 18.4. These temperature sensors 12.1 to 12.4 are provided inside the godet peripheral wall 1 and are connected to the signal transmitter 13 through a signal line 19. The stationary part of the signal transmitter 13 is connected to the heating control unit 11. Via the heating control unit 11, the induction coils 10 arranged corresponding to each one of the heating zones 18.1 to 18.4 are controlled in common. In this case, a plurality of induction coil groups of one heating zone are independent of the induction coils of adjacent heating zones. Therefore, for example, a predetermined surface temperature of the godet peripheral wall 1 can be obtained during operation. Thereby, different actual temperatures detected by the temperature sensors 12.1 to 12.4 are individually adjusted in the respective heating zones 18.1, 18.2. As a result, a substantially constant surface temperature is adjusted and maintained over the entire contact length of the godet peripheral wall 1.

  As shown in FIG. 2, induction heating acts only within a predetermined angular range of the godet peripheral wall 1 by the induction heating device 8. In this case, the induction heating device 8 extends over an angular range of approximately 120 °.

  In the operating state, the godet peripheral wall 1 is driven by the electric motor 7 and the shaft 3 at a peripheral speed of 1000 m / min or more without exception when processing the yarn. Based on the high peripheral speed of the godet peripheral wall 1, uniform heating of the entire peripheral surface of the godet peripheral wall 1 by the induction heating device 8 is obtained. Depending on the peripheral speed of the godet peripheral wall, the angular range of the godet peripheral wall 1 surrounded by the induction heating device 8 can be selectively configured in a range between 20 ° and 180 °. In this case, the surface temperature of the godet peripheral wall 1 is 60 ° C. to 250 ° C. based on the yarn treatment and the yarn type. In this case, the surface temperature deviation is in the range of <2 ° C. or <1 ° C. over the entire contact area of the godet peripheral wall surrounded by the induction coil.

  3 and 4 show schematic views of a godet according to another embodiment of the present invention as seen in different directions. 3 is a cross-sectional view, and FIG. 4 is a front view. The following description applies to FIGS. 3 and 4 unless otherwise indicated regarding which drawing.

  In the embodiment shown in FIGS. 3 and 4, the godet peripheral wall 1 has one end walls 4.1 and 4.2 on both end surfaces, respectively. These end walls 4.1 and 4.2 are mounted directly on the shaft 24 in a rotatable manner via bearings 6.1 and 6.2. The shaft 24 projects in a cantilever manner and is coupled to the support 2. Between the end walls 4.1 and 4.2, an electric motor 7 is arranged in the godet peripheral wall 1, preferably in the central region. The electric motor 7 includes a stationary stator 20 and a rotor 21 that surrounds the stator 20 in an annular shape. An air gap is formed between the stator 20 and the rotor 21. The rotor 21 is firmly coupled to the godet peripheral wall 1. The stator 20 is fixed to the shaft 24. Supply to the stator 20 is provided by a supply line, which is guided out through a shaft 24. For this purpose, the shaft 24 has a hollow cylindrical shape.

  An induction heating device 8 is disposed outside the godet peripheral wall 1, and the induction heating device 8 has a plurality of induction coils 9.1 and 9.2 that are held at a distance from the godet peripheral wall 1. ing. Each induction coil is formed by a winding support 23 and a winding 22. In this case, the extreme portion 10 of the winding support 23 extends in the longitudinal direction of the godet peripheral wall. The winding 22 is wound around the winding support 23 in a winding direction oriented in the longitudinal direction.

  As shown in FIG. 3, two induction coils are arranged side by side in the longitudinal direction of the godet peripheral wall. Each induction coil 9.1 and 9.2 has three induction coils adjacent to each other in the circumferential direction (see FIG. 4). Therefore, the induction heating device 8 is formed by a total of six induction coils, and these induction coils extend over about 90 ° in the circumferential direction of the godet peripheral wall 1. In this case, the induction heating device 8 extends in the longitudinal direction substantially to the end walls 4.1 and 4.2. In this embodiment, the plurality of induction coils of the induction heating device 8 are controlled in common via the heating control unit 11. For this purpose, the heating control unit 11 is connected to the induction coil via the supply connection 14.

  The induction coil is disposed on the holder 16. For this purpose, the winding support 23 is firmly connected to the holder 16 via the spacer 17. The holder has a half-shell shape that matches the godet peripheral wall 1, and is held by the holding support 2 so as to protrude in a cantilever manner at a distance from the godet peripheral wall 1. In this case, the coupling portion between the holder 16 and the support 2 is configured to be movable, and the holder 16 can be reciprocally adjusted between a working position (shown in FIG. 3) and a non-working position.

  In order to control and adjust the surface temperature of the godet peripheral wall 1, two temperature sensors 12.1, 12.2 are arranged on the godet peripheral wall 1, and these temperature sensors are signal transmitters inside the godet peripheral wall 1. 13 is connected. The signal transmitter 13 is fixed to the shaft 24 at a portion that does not rotate, and is connected to the heating control unit 11 via a signal line.

  The embodiment of the godet according to the present invention shown in FIGS. 3 and 4 is the same in function as the embodiment shown in FIGS. Accordingly, reference is made to the previous embodiment for the function of the godet. In this case, at least one or a plurality of yarns are similarly guided on the outer peripheral surface of the godet peripheral wall 1. The godet peripheral wall 1 is driven by an electric motor 7 disposed inside the godet peripheral wall 1. The godet peripheral wall 1 is heated via an induction heating device 8 disposed outside the godet peripheral wall 1. In order to control the surface temperature of the godet peripheral wall, two temperature sensors 12.1 and 12.2 are arranged corresponding to the heating control unit 11. In this case, power is supplied to the induction coils 9.1, 9.2 and others so that a substantially constant surface temperature is maintained on the godet peripheral wall 1.

  FIG. 5 shows another embodiment of a godet according to the present invention. Components having the same functions as those of the embodiment of FIGS. 1 and 2 are denoted by the same reference numerals as those of FIGS. 1 and 2, respectively. Moreover, since the godet structure shown in FIG. 5 is substantially the same as the godet structure shown in FIGS. 1 and 2, only the differences will be described below. For other explanations, refer to the explanations related to FIGS.

  In the embodiment shown in FIG. 5, the plurality of induction coils 9 of the induction heating device 8 are commonly held by a half shell-shaped support metal thin plate 25, and the support metal thin plate 25 has a shape matching the godet peripheral wall 1. have. The supporting metal thin plate 25 extends over an angular range of about 90 ° or more in the circumferential direction. A turning shaft 27 is disposed at one end of the supporting metal thin plate 25, and the turning shaft 27 extends parallel to the godet peripheral wall 1 in the axial direction. The pivot shaft 27 protrudes in a cantilever manner, and one end thereof is fixed to the support body 2. The supporting metal thin plate 25 is coupled to the pivot shaft 27 so that the supporting metal thin plate 25 is adjusted between the working position (FIG. 5) and the non-working position.

  A cover metal thin plate 26 is provided on the side of the turning shaft 27 opposite to the supporting metal thin plate 25, and the cover metal thin plate 26 is similarly coupled to the turning shaft 27 so as to be turnable. The cover metal thin plate 26 is formed in a half shell shape that matches the godet peripheral wall 1 and extends over an almost entire length of the godet peripheral wall 1 and in the circumferential direction of the godet peripheral wall 1 in an angular range of about 90 °. Yes. Thereby, both the supporting metal thin plate 25 and the cover metal thin plate 26 form a protective peripheral wall against the outside during operation of the godet. This on the one hand avoids heat loss and on the other hand the air flow can have a favorable influence on the yarn guide. Moreover, protection against external influences or unacceptable interference is obtained.

1 is a schematic cross-sectional view of a first embodiment of a godet according to the present invention; 1 is a schematic front view of a first embodiment of a godet according to the present invention; FIG. 6 is a schematic cross-sectional view of another embodiment of a godet according to the present invention. FIG. 6 is a schematic front view of another embodiment of a godet according to the present invention. FIG. 6 is a schematic view of another embodiment of a godet according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Godet peripheral wall 2 Support body 3 Axis 4, 4.1, 4.2 End wall 5 Hub 6.1, 6.2 Bearing 7 Electric motor 8 Induction heating apparatus 9.1, 9.2, 9.3, 9. 4 Induction coil 10, 10.1, 10.2 Extreme part 11 Heating control unit 12, 12.1, 12.2, 12.3, 12.4 Temperature sensor 13 Signal transmitter 14 Supply connection part 15 Supply line 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 metal sheet 26 Cover metal sheet 27 Swivel axis

Claims (13)

A godet for guiding, heating, and conveying a yarn, which has a hollow cylindrical godet peripheral wall (1) that is rotationally driven, and the godet peripheral wall (1) is attached to a support (2). An induction heating device (8) is provided which is rotatably supported, and the induction heating device (8) is spaced from the godet peripheral wall (1) in order to heat the godet peripheral wall (1). In a type having a plurality of induction coils (9.1, 9.2),
A godet for guiding, heating and transporting a yarn, characterized in that the induction heating device (8) is arranged outside the godet peripheral wall (1).   Of the godet peripheral wall (1), wherein the induction coil (9.1, 9.2, 9.3, 9.4) has a circumferential angle in the range of 20 ° to 180 °, preferably 40 ° to 130 °. The godet of claim 1, extending over a circumferential wall arc.   The godet according to claim 1 or 2, wherein the induction coil (9.1, 9.2, 9.3, 9.4) extends over substantially the entire length of the godet peripheral wall (1).   A plurality of induction coils (9.1, 9.2, 9.3, 9.4) are arranged in parallel to the godet peripheral wall (1), continuously in the axial direction and / or in the radial direction. The godet according to any one of claims 1 to 3.   A plurality of induction coils (9.1, 9.2, 9.3, 9.4) are combined to form a plurality of heating zones (18.1, 18.2, 18.3, 18.4). A plurality of induction coils (9.1, 9.2, 9.3, 3) arranged corresponding to one of these heating zones (18.1, 18.2, 18.3, 18.4). 9.4) is controllable independently and independently of adjacent induction coils (9.1, 9.2, 9.3, 9.4). The godet according to claim 1.   The induction coils (9.1, 9.2, 9.3, 9.4) each have two extremes (10.1, 10.2), these extremes in the axial direction, 6. The godet according to claim 1, wherein the godet extends along the godet peripheral wall (1) and at a constant distance from the godet peripheral wall (1).   The induction coils (9.1, 9.2, 9.3, 9.4) each have two extremes (10.1, 10.2), these extremes in the radial direction, 6. The godet according to claim 1, wherein the godet extends along the godet peripheral wall (1) and at a constant distance from the godet peripheral wall (1).   The distance between one extreme part (10.1, 10.2) of the induction coils (9.1, 9.2, 9.3, 9.4) and the godet peripheral wall (1) is 1 mm to The godet according to claim 6 or 7, which is in a range of 6 mm.   The induction coil (9.1, 9.2, 9.3, 9.4) is held by a half-shell-shaped support metal thin plate (25), and the support metal thin plate (25) is formed by the induction coil (9. 9). 9. The godet according to claim 1, wherein the godet is movably held between a working position and a non-working position.   The supporting metal thin plate (25) is supported by a pivot shaft (27) extending in the axial direction at a distance from the godet peripheral wall (1), and the pivot shaft (27) is supported by the supporting metal thin plate (25). The godet according to claim 8, wherein the cover metal thin plate (26) is supported on the side of the peripheral wall opposite to the side wall.   An induction heating device (8) is connected to the heating control unit (11), the heating control unit (11) is connected to at least one temperature sensor (12.1), and the temperature sensor (12.1). The godet according to any one of claims 1 to 10, wherein the godet detects a peripheral wall temperature of the godet peripheral wall (1).   11. Godet according to claim 10, wherein the temperature sensor (12.1) is fixed to the godet peripheral wall (1) and is connected to a stationary heating control unit (11) by means of a signal transmitter (12.1).   A plurality of temperature sensors (12.1, 12.2, 12.3, 12.4) are provided, and each of these temperature sensors (12.1, 12.2, 12.3, 12.4) is provided. The godet according to claim 10 or 11, wherein one of a plurality of heating zones (18.1, 18.2, 18.3, 18.4) in the godet peripheral wall (1) is arranged correspondingly.

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