JP4070022B2 - Heating roller device - Google Patents

Description

  The present invention relates to a heating roller device used for heating and drawing synthetic fiber yarns.

  For example, when a synthetic fiber yarn (hereinafter referred to as synthetic fiber yarn) is heated and stretched, two heating rollers A and B are arranged as shown in FIG. 4, and the synthetic yarn T is applied to the outer peripheral surfaces of the heating roller A and the heating roller B. The contact yarn is changed a plurality of times and the synthetic yarn T traveling by the heating rollers A and B is heated and stretched. As one of the heating rollers used in this case, there is an induction heating roller device as shown in FIG.

  In FIG. 3, 1 is a cylindrical roll, 2 is a rotary drive shaft, 3 is a cylindrical iron core, 4 is an induction coil wound around the outer periphery of the cylindrical iron core 3, and 5 is fixed to a motor (not shown). A bearing housing 6, a bearing 6, and a stationary platen 7 fixed to the bearing housing 5. The iron core 3 and the induction coil 4 constitute a magnetic flux generation mechanism that generates an alternating magnetic flux by applying an AC voltage to the induction coil 4, and this magnetic flux generation mechanism is fixed to the stationary platen 7 along the axial direction inside the hollow of the roll 1. Are arranged.

  One end of the cylindrical roll 1 is fixed to the tip of the rotation drive shaft 2 inserted along the hollow center axis, and is driven to rotate about the axis by the rotation of the rotation drive shaft 2. Within the wall thickness of the roll 1, a plurality of sealed chambers 1a extending in the axial direction from one end to the other end are provided in the circumferential direction, and a gas-liquid two-phase heat medium is sealed in each sealed chamber 1a. The end of each sealed chamber 1a on the stationary platen 7 side communicates with the annular communication hole 1b.

  In the induction heating roller device configured as described above, an alternating current is passed through the induction coil 4 to generate an alternating magnetic flux in the roll 1, and an electric current interlinking with the alternating magnetic flux is generated to cause the roll 1 itself to generate Joule heat. By heating. That is, the magnetic flux generation mechanism constitutes a heating source, and the roll 1 becomes a heating roller. In this heating, the amount of heat generated in the central portion of the induction coil 4 in the longitudinal direction is large, and the amount of heat generated is reduced as it goes to both ends, and the surface temperature in the axial direction of the roll 1 is also high in the central portion. As it goes to the end, it becomes lower. However, since the sealed chamber 1a in which the gas-liquid two-phase heat medium is enclosed is provided, the heat medium vaporized in the high temperature part moves to the low temperature part and liquefies. Heat the surface evenly.

By the way, when two cylindrical heating rolls are arranged in parallel and the synthetic yarn is stretched by heating over the two heating rollers a plurality of times, the synthetic yarn self-stretches due to heating, and the running yarn is swayed or sagging. Troubles such as fusing on the heating roll may occur. In order to avoid this trouble, the heating roll is formed in a conical shape so that slack or the like does not occur by running the yarn on the conical surface, and the roll 1 in the induction heating roller device also has a conical shape. It is desired to form.
JP 2000-150130 A Japanese Patent Laid-Open No. 51-15016 JP-A-62-215012

However, in order to obtain a conical surface in the roll 1 in the induction heating roller device described above, it is necessary to increase the outer diameter in the direction of the tip (the end on the side to which the rotary drive shaft 2 is fixed). However, when the outer diameter is increased as it goes to the tip, the thickness of the roll 1 becomes thicker as it goes to the tip, and the center of gravity of the roll 1 moves to the tip, so that the rotational drive shaft 2 must be thickened. distance from problems and sealed chamber 1a roll 1 of the surface of the called becomes far as it goes to the tip, there is a problem that effect by the latent heat movement fades.

In order to solve these problems, the diameter of the roll 1 is increased as it goes to the tip, that is, the inner diameter of the roll 1 is increased, and the increase in the thickness of the roll 1 is reduced. Although it is good to incline with respect to an axial center, if the sealed chamber 1a is inclined, the liquid phase of the heat medium concentrates on the tip of the roll 1 farthest from the axial center of the roll 1 due to the difference in centrifugal force, and latent heat transfer is caused. interfere up, there is a problem that the surface temperature of the furnace Lumpur 1 uneven.

  The problem to be solved by the invention is a sealed chamber in which a hollow roll is formed into a conical surface, and a gas-liquid two-phase heat medium extending along the conical surface in the axial direction of the roll is enclosed in the thickness of the hollow roll. In the heating roller provided with the above, the latent heat transfer by the gas-liquid two-phase heat medium is made quick to eliminate such a problem.

The present invention provides a hollow roll having a conical surface, a heating source disposed in the hollow of the roll, connected to the roll, and driven to rotate about the axis of the roll as a rotation center. In the heating roller device provided with a rotation drive shaft, a gas-liquid two-phase heat medium extending along a conical surface from the large-diameter side end portion to the small-diameter side end portion of the roll is provided inside the wall thickness of the roll. a plurality provided in a sealed chamber enclosing the circumferential direction, and the most important feature that formed by placing the heat source into the hollow of the large diameter side than the middle portion of the roll.

  In the present invention, a sealed chamber in which a gas-liquid two-phase heat medium is sealed is formed to extend from a large-diameter side end of the roll to a small-diameter side end along a conical slope as appropriate. Since it is arranged in a part of the hollow inside on the diameter side, the liquid in the sealed chamber facing the heating source is vaporized, and the gas in the sealed chamber not facing the heating source is liable to be liquefied, thereby latent heat by the gas-liquid two-phase heat medium Movement is promoted. Therefore, the uniformity of the temperature distribution on the roll surface can be improved, in other words, the region where the temperature distribution is uniform can be expanded. Moreover, the inner peripheral surface of the roll can be a conical inner surface, and the weight of the roll can be reduced. Furthermore, since the heating source is disposed in a part of the hollow on the large diameter side of the roll, a space is formed in the hollow on the small diameter side of the roll, and a bearing housing can be disposed in the space. The bearing to be supported is arranged close to the center of gravity of the roll, and this makes it possible to suppress vibrations and the like during high-speed rotation with a thin rotary drive shaft.

  In a heating roller having a sealed chamber in which a hollow roll has a conical surface and a gas-liquid two-phase heat medium extending along the inclination of the roll surface is enclosed in the thickness of the roll, the heat of the gas-liquid two-phase The purpose of speeding up the latent heat transfer by the medium is realized by a configuration in which the heating source is arranged in a part of the hollow inside the large diameter side of the roll.

  An embodiment of the present invention will be described below with reference to FIG. FIG. 1 is a longitudinal sectional view of a heating roller according to an embodiment. In FIG. 1, 11 is a hollow roll, 12 is a rotary drive shaft, 13 is an iron core, 14 is an induction coil wound around the outer periphery of the iron core 13, and 15 is a magnetic flux generating mechanism (heating) comprising the iron core 13 and the induction coil 14. 16) a flange fixed to a motor or bearing housing (not shown), 17 a support, 18 a sealed chamber formed within the thickness of the roll 11, 19 a communication hole, 20 a liquid phase 20a and a gas phase 20b Is a gas-liquid two-phase heat medium consisting of

  The hollow roll 11 has a conical shape on both the surface and the inner surface, and the wall thickness from the large-diameter side end of the roll 11 to the small-diameter side end is substantially constant. The small-diameter side edge of the roll 11 is opened, the large-diameter side edge is closed, and the tip of the rotary drive shaft 12 inserted along the axial center in the hollow of the roll 11 is fitted and fixed at the center position. ing. Within the wall thickness of the roll 11 from the large-diameter side end to the small-diameter side end, a plurality of sealed chambers 18 formed by a drill or the like along the inclination of the conical surface are formed in the circumferential direction. Are communicated with each other through an annular communication hole 19 at an intermediate portion thereof. In addition, you may make it provide this communicating hole 19 in the large diameter side edge part of the roll 11, as shown in FIG. In this case, the weight of the large diameter side end of the roll 11 can be further reduced.

  A heat medium 20 such as water is enclosed in the sealed chamber 18, and a liquid phase 20 a and a gas phase 20 b are formed by heating the roll 11. The amount of the heat medium 20 is such that the gas phase 20b is formed over the entire length of the sealed chamber 18 when the roll 11 rotates. By this amount, the sealed chamber 18 is free from a portion where the liquid 20a of the heat medium 20 is filled due to the centrifugal force when the roll 11 rotates, and thereby the latent heat can be easily moved over the entire length of the sealed chamber 18.

  The flange 16 has a cylindrical support body 17 projecting integrally from the center of the inner surface, and this support body 17 has a base portion 17a having a suitably long outer diameter and a fixing portion 17b having a smaller outer diameter. The fixing portion 17b is the leading end and extends to the position near the closed end of the roll 11 along the axial direction of the roll 11. The magnetic flux generation mechanism 15 is installed on the fixed portion 17 b of the support 17 and is arranged on the larger diameter side from an appropriate position of the intermediate portion of the roll 11. In addition, while increasing the outer diameter of the base portion 17a and bringing it closer to the inner peripheral surface of the roll 11, the radiant heat of the roll 11 is reflected to the roll 11 to suppress heat dissipation, while the radiant heat of the roll 11 into the base portion 17a is shielded. The influence of the radiant heat on the bearing is suppressed.

  Due to the arrangement of the magnetic flux generating mechanism 15 close to the large diameter side, the heating amount is large in the portion facing the magnetic flux generating mechanism 15 in the entire length of the sealed chamber 18, and the vaporization of the liquid is promoted, and the portion not facing the magnetic flux generating mechanism 15 is heated. The amount is small and gas liquefaction is promoted. The liquefied liquid moves to a portion with a large heating amount due to centrifugal force, and the gas moves to a portion with a small heating amount. This circulation, that is, the movement of latent heat, is performed quickly, and the magnetic flux generating mechanism 15 in the axial direction of the roll 11 is moved. The surface temperature of a section longer than the length of is made uniform.

  In the embodiment, the inner peripheral surface of the roll is also conical, and the thickness from the large-diameter side end of the roll 11 to the small-diameter side end is substantially constant, and the inner diameter of the sealed chamber is also substantially constant. However, the inner peripheral surface of the roll may be formed in a cylindrical shape parallel to the axis, and the inner diameter of the sealed chamber may be increased as it goes to the end portion on the large diameter side. In the embodiment, the heating source is a magnetic flux generation mechanism, but the heating source is not limited to the magnetic flux generation mechanism, and may be a heater, for example. Furthermore, although the hollow roll of an Example is a holding type, it may be a both-end holding type. The present invention can also be applied to a roll having a plurality of conical surfaces in the axial direction.

It is a longitudinal cross-sectional view of the heating roller which concerns on the Example of this invention. It is a longitudinal cross-sectional view of the principal part of the heating roller which concerns on the other Example of this invention. It is a longitudinal cross-sectional view of an induction heating roller. It is a schematic perspective view of a heating roller device showing a state in which yarns are heated and stretched.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Hollow roll 12 Rotation drive shaft 13 Iron core 14 Induction coil 15 Magnetic flux generation mechanism (heating source)
16 Flange 17 Support 18 Sealed chamber 19 Communication hole 20 Heat medium 20a Liquid phase 20b Gas phase

Claims (5)

A hollow roll having a conical surface; a heating source disposed in the hollow of the roll; for heating the roll; and a rotary drive shaft connected to the roll and driven to rotate about the axis of the roll as a rotation center A sealed chamber in which a gas-liquid two-phase heat medium extending along a conical surface from the large-diameter side end portion to the small-diameter side end portion of the roll is enclosed in the wall thickness of the roll. together with a plurality disposed in the circumferential direction, the heating roller apparatus of the heat source is characterized by being disposed in the hollow inside of the larger diameter side than the middle portion of the roll. The heating roller device according to claim 1, wherein an inner peripheral surface of the roll is a conical inner surface corresponding to a conical shape of the surface. The heating roller device according to claim 1, wherein the heating source is an alternating magnetic flux generation mechanism in which a conducting wire is wound around an iron core. The amount of liquid of the heat medium sealed in the sealed chamber is an amount that forms a gas phase across the entire length of the sealed chamber when the roll is rotated. The heating roller device according to the description. The heating roller device according to claim 1, 2, 3, or 4, wherein a hole communicating with the plurality of sealed chambers is formed at an end portion on a large diameter side of the roll. .

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