JP3853509B2 - Induction heating roller device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an induction heat roller device.
[0002]
[Prior art]
As is well known, the induction heating roller device is mainly composed of a rotatable cylindrical roller and a fixed magnetic flux generating mechanism disposed inside the hollow, and the magnetic flux generating mechanism is usually made of a magnetic steel plate. It is formed by winding an induction coil around a wound iron core. And by applying an alternating current to the induction coil, an alternating magnetic flux is generated in a magnetic circuit composed of an iron core and a roller linked to the induction coil, and this alternating magnetic flux generates an induced current in the roller. The roller becomes Joule heat and becomes high temperature.
[0003]
In this case, since the magnetic flux generating mechanism is disposed in the vicinity of the inside of the roller, the temperature gradually increases due to radiation from the roller and heat conduction of the air, and the magnetic flux generating mechanism itself generates heat due to its own iron loss and copper loss. Tend to increase in temperature. For example, when the set temperature of the roller is 250 degrees Celsius, the temperature of the magnetic flux generation mechanism is increased to 250 degrees to 350 degrees Celsius.
[0004]
By the way, in the induction heating roller device, since it is necessary to guide and wind the yarn around the surface of the roller as in the case where the yarn such as synthetic fiber is used for hot drawing, a roller and a magnetic flux generating mechanism are provided in the motor that rotationally drives the roller. Some must be fixed in a cantilevered manner. In this case, when the heat of the magnetic flux generation mechanism is transmitted to the motor, the life of the rotary bearing and the coil of the motor is shortened by the heat. Therefore, in order to fix and hold the magnetic flux generation mechanism to the motor, it is necessary to avoid heat transfer from the magnetic flux generation mechanism to the motor as much as possible.
[0005]
FIG. 6 shows the structure of the induction heating roller device in such a case. In this figure, 1 is a cylindrical roller with a bottom, 4 is formed by winding an induction coil 2 around a cylindrical wound core 3. The magnetic flux generating mechanism, 5 is a motor that rotationally drives the roller 1, 6 is a magnetic disk (coil flange), and 7 is a heat insulating block. The motor 5 has a rotating shaft 5a extending into the hollow interior of the cylindrical wound core 3 and a bearing 5c that supports the rotating shaft 5a, and a motor flange 5b for attaching the magnetic flux generating mechanism 4 is formed at the end.
[0006]
The bottomed cylindrical roller 1 is formed with a shaft fitting portion 1a extending inwardly at the center of the bottom portion. The shaft fitting portion 1a is fitted to the tip of the rotating shaft 5a of the motor 5 and fastened. It is fixed. The magnetic flux generation mechanism 4 forms a magnetic path with a small gap between the wound core 3 and the roller 1 at the end on the motor 5 side, and prevents leakage magnetic flux from flowing on the motor side (when leakage magnetic flux flows on the motor side, The portion is heated by generating Joule heat.) A coil flange 6 made of a magnetic material is attached by a mounting bracket 8.
[0007]
And the heat insulation block 7 is inserted between the coil flange 6 and the motor flange 5b, the contact area of the coil flange 6 and the motor flange 5b is reduced, heat transfer is reduced, and the coil flange 6 and the motor flange 5b are connected. Fastened and fixed with bolts 9. As a result, the magnetic flux generation mechanism 4 is fixedly held by the motor 5. Reference numeral 10 denotes a lead wire for supplying AC power to the induction coil 2.
[0008]
That is, in such an induction heating roller device, the magnetic flux generating mechanism 4 is provided with the coil flange 6 at the end portion on the motor 5 side to prevent leakage magnetic flux from flowing on the motor side, and the coil flange 6 and the motor flange 5b. Insulating block 7 is inserted between them to insulate, and cantilever is fixed to motor 5.
[0009]
[Problems to be solved by the invention]
By the way, in the thermal drawing of synthetic fibers or the like, the production speed is as high as 4000 m / min to 6000 m / min, and it is necessary to rotate the roller 1 at a peripheral speed that satisfies the speed. Therefore, it is necessary to firmly attach the magnetic flux generation mechanism 4 to the motor 5. If this attachment is weak, the magnetic flux generating mechanism 4 will form a mechanically low resonance frequency, and at the rotational speed of the roller 1 generated according to the rotational speed due to the limit of the processing accuracy of the bearing 5c and the roller 1, etc. Resonance with the vibration of the rotation leads to a problem that the rotary shaft 5a and the bearing 5c break down due to resonance.
[0010]
However, the conventional fixed holding structure of the magnetic flux generation mechanism 4 cannot be so strong that such high-speed rotation can be stably obtained (the iron core 3 is also fixed to the end of the bearing 5c by a support bracket, for example). If it is held, the attachment becomes strong, but the iron core 3 is composed of a wound iron core, and the magnetic flux flows through the bearing 5c and the bearing 5c is heated, so that such attachment cannot be performed. There is a problem that the strength of the shaft 5a must be increased.
[0011]
The present invention has been made in view of such circumstances, and can simplify the structure for attaching the magnetic flux generation mechanism to the motor, and can achieve stable and high-speed rotation without increasing the strength of the rotating shaft of the motor. It is an object of the present invention to provide an induction heating roller device that can obtain the above.
[0012]
[Means for Solving the Problems]
The present invention includes a bottomed cylindrical roller having a shaft fitting portion that protrudes inwardly at a bottom center portion, a cylindrical magnetic flux generation mechanism that is disposed concentrically inside the hollow of the roller and generates heat from the roller, in Ete comprising induction heating roller apparatus Bei a motor having a rotary shaft hollow interior is inserted into the distal end portion is fitted to the shaft fitting portion of the roller of said magnetic flux generating mechanism, a bearing portion for supporting the rotary shaft The cylindrical magnetic core is formed by extending the hollow magnetic flux generating mechanism to a position near the center of gravity of the magnetic flux generating mechanism, and the magnetic flux generating mechanism includes a cylindrical iron core in which iron core steel plates having a curved portion are radially arranged and stacked. The main feature is that it is formed by an induction coil wound around an iron core, and the magnetic flux generation mechanism is fixedly held at the tip of the extended bearing portion.
[0013]
Bend the iron core of the magnetic flux generating mechanism, i.e. composed of core steel plates having an involute curve or the like, and because it is Rukoto provided a gap between the rollers at the motor side end of the iron core, radially from the surface of the core Although the number of leakage magnetic fluxes penetrating through increases, the number of main magnetic fluxes passing through the iron core is reduced, and the influence of the magnetic flux on the motor side by the magnetic flux generation mechanism can be reduced, and the heat of the magnetic flux generation mechanism can be reduced. The conduction to the motor side is reduced by the gap. Therefore, the conventional coil flange and spacer can be omitted, and the magnetic flux generating mechanism and the roller are held closer to the motor side accordingly, that is, the distance between the position of the center of gravity of the roller and the position of the bearing in the motor. Thus, the stress generated on the rotating shaft can be reduced and the critical speed of the rotating shaft can be increased.
[0014]
The fixed and held at two points of the tip and base of the bearing portion of the rotating shaft of the motor extending the magnetic flux generating mechanism into the hollow interior of the cylindrical core and (Claim 2), to the motor of this fixed into Thus magnetic flux generation mechanism Can be further strengthened, and stable and higher-speed rotation can be obtained without increasing the strength of the rotating shaft.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a cross-sectional view of the induction heating roller device according to the embodiment, FIG. 2 is a perspective view of the iron core of the induction heating roller device shown in FIG. 1, FIG. 3 is a partially enlarged plan view of the iron core shown in FIG. FIG. 5 is a cross-sectional view of an induction heat roller device according to another embodiment, and FIG. 5 is a cross-sectional view of an induction heat roller device according to another embodiment. In the drawings, the same parts are denoted by the same reference numerals.
[0016]
In FIG. 1, reference numeral 11 denotes a bottomed cylindrical roller, 14 denotes a magnetic flux generation mechanism formed by winding an induction coil 12 around a cylindrical iron core 13, and 15 denotes a motor that rotationally drives the roller 11. The bottomed cylindrical roller 11 and the motor 15 are configured in the same manner as the conventional one shown in FIG. 6, and the roller 11 has a shaft fitting portion 11 a formed on a tapered surface formed at the tip of the rotating shaft 15 a of the motor 15. It is attached to the motor 15 by being fitted and fixed to the tapered surface. Reference numeral 20 denotes a lead wire for supplying AC power to the induction coil 12.
[0017]
As shown in FIGS. 2 and 3, the magnetic flux generating mechanism 14 includes a bending portion 13a in which the iron core 13 is bent in an involute curve shape in the radial direction, and a bending angle θ, for example, 30 continuously with the bending portion 13a. The core steel plate 13c formed by the bent portion 13b formed at a degree is arranged radially so that the edge of the bent portion 13b is along the cylindrical inner periphery and the end edge of the curved portion 13a is along the cylindrical outer periphery. They are laminated and formed in a cylindrical shape, and an induction coil 12 is wound around the iron core 13.
[0018]
The magnetic flux generation mechanism 14 is formed shorter than the roller 11 so as to form an appropriate gap 16 in the end portion of the roller 11 on the motor 15 side, and the magnetic flux generation mechanism at the front end portion of the bearing 15c of the motor 15 by the support fitting 21. 14 is held at a position near the center of gravity. By this fixing, the magnetic flux generation mechanism 14 has a mechanically high resonance frequency, and the rotation speed of the roller 11 can be increased.
[0019]
Thus, when the iron core 13 forming the magnetic flux generation mechanism 14 is formed of a curved portion, that is, an iron core steel plate 13c having an involute curve, and a gap 16 is provided in the magnetic path between the iron core 13 and the roller 11 at the motor side end, As the gap 16 is increased, the magnetic resistance is increased and the number of main magnetic fluxes passing through the iron core 13 is reduced. That is, the magnetic flux leakage to the motor 15 side is reduced, and the conventional coil flange can be omitted.
[0020]
On the other hand, by providing the gap 16, the number of magnetic fluxes emitted through the surface of the iron core 13 in the radial direction increases. However, since the iron core 13 is constructed by radially arranging and laminating iron core steel plates 13c having involute curves, the eddy current loss due to the magnetic flux, that is, iron loss is suppressed low, and self-heating of the magnetic flux generating mechanism 14 itself is prevented. The Further, although the magnetic flux generating mechanism 14 is heated by heat transfer by radiation and convection from the roller 11, heat transfer to the motor 15 side can be reduced by the gap 16. Thereby, the conventional heat insulation block can be omitted, and the number of assembly parts can be reduced.
[0021]
In the above embodiment, the magnetic flux generating mechanism 14 is fixedly held by the support fitting 21 at the tip of the bearing 15c of the motor 15, but this fixed holding is performed at the end of the motor 15 as shown in FIG. The outer diameter of the base 22 of 15c is enlarged, the end of the magnetic flux generation mechanism 14 on the motor 15 side is fitted into the base 22, and the fitting is fixed by this fitting and the support fitting 21 at the tip of the bearing 15c of the motor 15 is used. You may make it hold | maintain by fixation. In this case, the magnetic flux generation mechanism 14 can be fixedly supported on the motor 15 and the roller 11 can be rotated more stably at a high speed.
[0022]
Further, as shown in FIG. 5, a mounting bracket 17 may be attached to the end portion of the magnetic flux generation mechanism 14, and the mounting bracket 17 may be applied to the motor flange 15b and fastened with a bolt 18 to be fixedly held.
[0023]
【The invention's effect】
As described above in detail, according to the present invention, the iron core forming the magnetic flux generating mechanism is formed of the iron core steel plate having a curved portion such as an involute curve, and the motor side end portion is appropriately placed in the magnetic path between the iron core and the roller. it is possible to provide the gap, there is little influence due to impact and heat transfer of the magnetic flux to the motor side of the magnetic flux generating mechanism, approach the roller and the magnetic flux generation mechanism in the motor without providing a coil flange and insulating block as in the prior art The distance between the position of the center of gravity of the roller and the bearing position in the motor can be shortened, and the attachment of the magnetic flux generating mechanism to the motor can be strengthened.
[0024]
As a result, the strength required for the rotating shaft of the motor is reduced, the shaft diameter can be reduced with lower materials, the degree of freedom of design can be expanded, the cost can be reduced, and the critical speed (mechanical resonance frequency) can be increased. It becomes possible to rotate stably even at high speed. In addition, since the conventionally required coil flange and heat insulation block are not required, the structure for mounting the magnetic flux generation mechanism to the motor can be simplified, and the manufacturing cost and installation cost can be reduced.
[0025]
Also, if one end or both ends of the magnetic flux generating mechanism are fixedly held at the bearing end of the rotating shaft of the motor extending into the hollow interior of the cylindrical iron core, the magnetic flux generating mechanism is separated from the motor flange. Heat transfer from the motor flange to the motor flange can be further prevented.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an induction heat roller device according to an embodiment of the present invention.
2 is a perspective view of an iron core of the induction heat roller device shown in FIG. 1. FIG.
3 is a partially enlarged plan view of the iron core shown in FIG. 2. FIG.
FIG. 4 is a cross-sectional view of an induction heat roller device according to another embodiment of the present invention.
FIG. 5 is a cross-sectional view of an induction heating roller device according to still another embodiment of the present invention.
FIG. 6 is a cross-sectional view of a conventional induction heating roller device.
[Explanation of symbols]
11 Roller 11a Shaft fitting portion 12 Inductive coil 13 Cylindrical iron core 13a Bending portion 13b Bending portion 13c Iron core steel plate 14 Magnetic flux generation mechanism 15 Motor 15a Rotating shaft 15b Motor flange 15c Bearing 16 Gap 17 Mounting bracket 18 Bolt 21 Support bracket 22 Bearing base

Claims (2)

A bottomed cylindrical roller having a shaft fitting portion protruding inward at the center of the bottom, a cylindrical magnetic flux generation mechanism that is concentrically disposed inside the hollow of the roller and generates heat from the roller, and the magnetic flux generation mechanism hollow interior is inserted into the tip in Ete becomes induction heating roller apparatus Bei a motor having a rotary shaft fitted to the shaft fitting portion of the roller bearing unit said cylindrical supporting the rotary shaft of the as well as extended to near the center of gravity position of the magnetic flux generating mechanism in the hollow interior of the magnetic flux generating mechanism, wherein the magnetic flux generating mechanism, winding core steel sheet having a curved portion and a cylindrical iron core arranged stacked radially to the cylindrical core An induction heating roller device, characterized in that the magnetic flux generation mechanism is fixedly held at the tip of the extended bearing portion. The induction heating roller device according to claim 1, wherein the induction heating roller device is fixed to a distal end of a bearing portion provided with a magnetic flux generation mechanism and a base portion of the bearing portion.

Images