WO2011024508A1

WO2011024508A1 - Induction heating roller device

Info

Publication number: WO2011024508A1
Application number: PCT/JP2010/056602
Authority: WO
Inventors: 良夫北野; 幸三岡本; 孝次北野
Original assignee: トクデン株式会社
Priority date: 2009-08-27
Filing date: 2010-04-13
Publication date: 2011-03-03
Also published as: CN102474922A; CN102474922B; JP5779098B2; DE112010002615T5; JPWO2011024508A1

Abstract

Disclosed is an induction heating roller device whereby support stability via magnetic bearings is improved, while still ensuring temperature uniformity of a roller body. The disclosed induction heating roller device is provided with: a roller body (2); a rotating shaft (3) provided in the middle of a base section of the roller body (2); a support (4), disposed in a cavity between the roller body (2) and the rotating shaft (3), inside which the rotating shaft (3) is inserted and on which a magnetic-flux generation mechanism (5) is provided; and radial magnetic bearings (6, 7) that radially support the rotating shaft (3) from the front end and back end thereof without making contact and that have magnetic pole sections, which are provided on the inner surface of the support (4) and face the outer surface of the rotating shaft (3).

Description

Induction heating roller device

The present invention relates to an induction heating roller device, and more particularly to a cantilever induction heating roller device.

In the manufacturing process of synthetic fibers such as nylon and polyester, a direct stretching process is performed in which molecular orientation is adjusted by heating and spinning in the length direction after spinning to improve properties such as tensile strength.

In this direct drawing process, a plurality of induction heating roll devices are generally used to heat the synthetic fibers and to draw the synthetic fibers by the difference in rotational speed between the induction heating roll devices.

As shown in Patent Document 1, the induction heating roller device includes a roller body having a shaft fitting portion at the center of the bottom, and a magnetic flux generation mechanism including a cylindrical iron core and an induction coil arranged inside the roller body. In addition, the roller body is supported in a cantilever manner by fitting and connecting the tip of the rotating shaft of the motor to the shaft fitting portion of the roller body, and the motor is directly rotated by the motor. In such a configuration, the roller main body generates heat by rotating the roller main body by the motor and exciting the induction coil of the magnetic flux generating mechanism by the AC power supply.

As a more specific configuration of the induction heating roller device, the induction heating roller device includes a cylindrical portion that extends into the hollow of the roller body and is integrally connected to the motor. The cylindrical portion is extended inside the roller body so as to be along the axial direction of the roller body. And the magnetic flux generation mechanism is being fixed to the outer surface of this cylindrical part. Further, a rolling bearing is installed between the inner surface on the tip side of the cylindrical portion and the rotating shaft, and the rotating shaft is rotatably supported with respect to the cylindrical portion by this rolling bearing.

However, in the configuration in which the rotating shaft is supported by the rolling bearing, there is a problem that it is necessary to periodically replace the rolling bearing due to the life of the rolling bearing due to wear. In particular, the replacement work of the rolling bearing in the induction heating roller device is extremely burdensome.

On the other hand, as shown in Patent Document 2, there is one in which the roller body is supported by a magnetic bearing, and this magnetic bearing is provided on the outer circumferential surface of the cylindrical portion, and the magnetic pole portion thereof faces the inner circumferential surface of the roller body. It is provided to do. Thus, by arranging the magnetic bearings so-called radially outward, the opposing area between the magnetic pole part and the roller body (supported body) is made as large as possible to improve support stability.

However, when the roller body is supported by the magnetic bearing, the magnetic bearing is arranged on both sides in the axial direction of the magnetic flux generation mechanism, and the magnetic path of the magnetic flux generated by the magnetic flux generation mechanism is restricted by the magnetic bearing. is there. As a result, there is a problem that it is extremely difficult to control the temperature of the roller body uniformly without the magnetic flux passing through the entire roller body.

Further, in order to solve the temperature non-uniformity problem of the roller body due to the arrangement relationship between the magnetic bearing and the magnetic flux generating mechanism, as shown in Patent Document 3, the magnetic path is extended in the axial direction by the guide member, and the magnetic flux is In some cases, the temperature of the roller body is made uniform by guiding it to the outside.

However, even if the magnetic path is extended by the guide member, it is difficult to make the temperature of the roller body uniform because the magnetic flux density passing through the roller body is different at each position in the axial direction. In addition, the configuration in which the guide member is provided inside the roller body is not a good idea because it limits the size of the roller body and the arrangement of other components such as magnetic bearings.

In addition, the magnetic bearing on the tip side is provided inward so that the magnetic pole portion faces the outer peripheral surface of the rotating shaft, but in order to ensure support stability, it is necessary to increase in the longitudinal direction, In this case, there is a problem in that it is difficult to ensure temperature uniformity of the roller body because the region through which the magnetic flux passes is further limited.

JP 2009-163968 A Japanese Patent No. 4106277 Japanese Patent No. 4212227

Accordingly, the present invention has been made to solve the above-mentioned problems all at once, and it is a main intended problem to improve the support stability by the magnetic bearing while ensuring the uniformity of the temperature of the roller body. It is what.

That is, the induction heating roller device according to the present invention includes a bottomed cylindrical roller body having a jacket chamber in which a gas-liquid two-phase heat medium is enclosed and extended in the axial direction, and a rotation center axis of the roller body. A rotating shaft provided at the center of the bottom of the roller body, and the rotating shaft is inserted into the interior of the roller body, and is disposed in a hollow between the roller body and the rotating shaft. A support body provided with a magnetic flux generation mechanism comprising an induction coil wound around a cylindrical iron core, and a magnetic pole portion provided on the inner peripheral surface of the support body and facing the outer peripheral surface of the rotating shaft, And a radial magnetic bearing that supports the rotating shaft in a radial direction in a non-contact manner on the front end side and the rear end side.

If this is the case, since the rotating shaft is supported by the magnetic bearing, there is no wear when using a rolling bearing, and the life of the bearing can be greatly extended. In addition, since the jacket body in which the gas-liquid two-phase heat medium is sealed is provided in the roller body, the temperature in the axial direction of the roller body can be made uniform. Further, since the jacket chamber is provided, the temperature can be made uniform even if the magnetic bearing is lengthened in the axial direction, so that the magnetic bearing can be enlarged in the axial direction, and the support stability of the rotating shaft is improved. Can be improved. In addition, since the rotary shaft is rotatably supported with the magnetic bearing inwardly in the radial direction, the magnetic bearing can be arranged without considering the arrangement relationship between the roller body and the magnetic bearing. Support stability can be further improved, such as disposing the end side magnetic bearing outside the roller body.

In order to improve the support stability of the roller body and the rotating shaft, the radial magnetic bearing on the front end side is disposed inside the roller body, and the radial magnetic bearing on the rear end side is disposed outside the roller body. It is desirable that

The one that supports the rotating shaft with a magnetic bearing can rotate at a higher speed than the one that supports the rotating shaft with a rolling bearing. Therefore, when the roller body and the rotating shaft are taper fitted and connected by a fastening element, the roller body There is a problem that the backlash between the rotating shaft and the rotating shaft increases and the rigidity decreases. In order to solve this problem, it is desirable that the roller body and the rotating shaft are integrated.

In order not to increase the size of the support and the roller body in the radial direction, it is desirable that the radial magnetic bearing on the front end side and the magnetic flux generation mechanism are provided so as not to overlap in the axial direction.

In order to suppress the occurrence of unstable vibration due to temperature change of the magnetic bearing, it is desirable that a cooling fluid passage through which a cooling fluid flows is formed in a portion of the support where the radial magnetic bearing is provided.

Similarly, by providing a heat insulating material on the outer peripheral surface of the support opposite to the inner peripheral surface of the roller body, it is possible to suppress an increase in the temperature of the magnetic bearing in a steady state and to generate unstable vibrations. Can be suppressed.

According to the present invention configured as described above, it is possible to improve the support stability by the magnetic bearing while ensuring the uniformity of the temperature of the roller body.

It is sectional drawing of the induction heating roller apparatus which concerns on one Embodiment of this invention. FIG. 3 is a cross-sectional view taken along line AA showing the magnetic bearing on the distal end side of the same embodiment. It is sectional drawing of the induction heating roller apparatus which concerns on deformation | transformation embodiment. It is sectional drawing of the induction heating roller apparatus which concerns on deformation | transformation embodiment.

DESCRIPTION OF SYMBOLS 100 ... Induction heating roller apparatus 2 ... Roller main body 21A ... Jacket chamber 3 ... Rotating shaft 5 ... Magnetic flux generation mechanism 51 ... Cylindrical iron core 52 ... Induction coil 4 ... Support body 6... Radial

magnetic bearings

6 a and 6 b on the front end side, magnetic pole part 7...

Hereinafter, an embodiment of an induction heat roller device according to the present invention will be described with reference to the drawings.

As shown in FIG. 1, the induction heat roller device 100 according to the present embodiment supports a roller body 2, a rotating shaft 3 provided at the center of the bottom of the roller body 2, and the rotating shaft 3 rotatably. A support body 4 provided with a magnetic flux generation mechanism 5, and radial

magnetic bearings

6 and 7 provided on the inner peripheral surface of the support body 4 to support the rotary shaft 3 in a non-contact manner in the radial direction on the front end side and the rear end side; It comprises. Although not shown, a thrust magnetic bearing that supports the rotary shaft 3 in a thrust direction in a non-contact manner is disposed.

The roller body 2 has a bottomed cylindrical shape in which the rotation shaft 3 is integrally provided at the center of the bottom. In addition, a plurality of jacket chambers 21A for enclosing a gas-liquid two-phase heat medium extending in the longitudinal direction (axial direction) are formed on the side peripheral wall 21 of the roller body 2 at equal intervals in the circumferential direction. The inner end portion communicates with an annular hole provided in the circumferential direction of the side peripheral wall 21, and the jacket chambers 21A are continuous with each other. The outer surface temperature of the roller body 2 is made uniform by the latent heat transfer of the gas-liquid two-phase heat medium sealed in the jacket chamber 21A. Further, the jacket chamber 21 </ b> A is provided over substantially the entire length in the axial direction on the side peripheral wall 21 of the roller body 2 beyond the position facing the magnetic flux generation mechanism 5. Further, a temperature sensor 10 for detecting the temperature of the outer surface is embedded in the distal end side of the side peripheral wall 21 of the roller body 2.

The rotation shaft 3 of the present embodiment is integrally formed with the roller body 2 and is provided at the center of the bottom of the roller body 2 so as to be along the rotation center axis C. Moreover, the rotor 81 of the drive motor 8 is detachably fixed to the rear end portion 301 of the rotary shaft 3 so as to be equally spaced in the circumferential direction. As an example, the rear end portion 301 of the rotary shaft 3 has a tapered shape that decreases in diameter toward the rear end, and the inner peripheral surface of the rotor 81 has a tapered shape that is opposed to the taper of the rear end portion 301. In a state where the rotor 81 is fitted to the rear end portion 301 of the rotating shaft 3, the rear end portion 301 and the rotor 81 are fastened and fixed by the fastening elements 9 such as bolts and nuts. With such a configuration, when replacing the magnetic bearing 7 on the rear end side, the magnetic bearing 7 on the rear end side can be easily pulled out to the rear end side by removing the fastening element 9 and removing the rotor 81. .

The support 4 has a rotary shaft 3 inserted therein, and a tip portion is disposed in a hollow between the roller body 2 and the rotary shaft 3, and the rotary shaft 3 is arranged at the front end side and the rear end side with a magnetic bearing 6. , 7 are rotatably supported. A stator 82 of the drive motor 8 is provided on the inner peripheral surface of the support 4 that faces the rotor 81 of the rotating shaft 3. Specifically, the support 4 includes a support body 41 to which the magnetic bearing 6 on the front end side and the magnetic bearing 7 on the rear end side are attached, and a stator to which the stator 82 is fixed. And a fixing portion 42.

The support body 41 has a cylindrical portion 411 having an outer diameter smaller than the inner diameter of the roller body 2 and an outer diameter larger than the outer diameter of the cylindrical portion 411, and the roller body 2 at the proximal end portion of the cylindrical portion 411. And a flange portion 412 covering the opening. A plurality of cooling fluid passages 4 </ b> A are formed in the side peripheral wall of the support body 41 so as to open at the outer peripheral surface of the flange portion 412 and extend to the tip portion of the cylindrical portion 411. And is opened at the outer peripheral surface of the flange portion 412. A cooling fluid such as water or oil is supplied into the cooling fluid passage 4A, and the support 4 is cooled by circulation of the cooling fluid, and the magnetic flux generating mechanism 5 and the magnetic bearing 6 on the front end side are cooled by this cooling. To do.

Thus, by providing the cooling fluid passage 4A and cooling the front end side bearing 6, the bearing temperature in the thermal steady state can be lowered, so that the bearing clearance and preload during assembly and steady state can be reduced. A difference can be made small and it can suppress that unstable vibration generate | occur | produces until it reaches a steady state.

The magnetic flux generating mechanism 5 is provided on the support body 4 (specifically, the cylindrical portion 411) along the inner peripheral surface of the roller body 2, and the magnetic steel plates that are curved are arranged and laminated radially along the circumferential direction. The cylindrical iron core 51 formed in this manner and the induction coil 52 wound around the outer peripheral surface of the cylindrical iron core 51 are cylindrical.

By such a magnetic flux generation mechanism 5, an alternating magnetic flux is generated when an AC voltage is applied to the induction coil 52, and the alternating magnetic flux passes through the cylindrical iron core 51 and the side peripheral wall 21 of the roller body 2. This passage generates a current in the roller body 2, and the roller body 2 generates Joule heat by the current.

Further, the heat insulating material 11 is provided on the outer peripheral surface of the support body 4 facing the inner peripheral surface of the roller body 2, specifically, on the outer peripheral surface of the cylindrical portion 411 of the support body 4 and the magnetic flux generation mechanism 5. Thereby, the temperature rise of the magnetic bearing in a steady state can be suppressed, and the occurrence of unstable vibration can be suppressed.

The magnetic bearing 6 on the distal end side is provided on the inner peripheral surface of the support 4 and has

magnetic pole portions

6a and 6b facing the outer peripheral surface of the rotating shaft 3, and supports the rotating shaft 3 in the radial direction on the distal end side in a non-contact manner. To do. The magnetic bearing 6 on the front end side is provided on the front end side with respect to the magnetic flux generation mechanism 5 and is provided in the roller body 2.

Specifically, as shown in the partially enlarged view of FIG. 1 and the cross-sectional view taken along the line AA of FIG. 4 magnetic bearings arranged at equal intervals in the circumferential direction on the circumferential surface. Each magnetic bearing 6 includes a yoke 61 having a substantially U-shaped cross section in which

magnetic pole portions

6 a and 6 b are formed at both ends, and a coil 62 wound around the

magnetic pole portions

6 a and 6 b of the yoke 61. An arcuate recess having substantially the same curvature as the outer peripheral surface of the rotating shaft 3 is formed at the tips of the

magnetic pole portions

6 a and 6 b, and the leading end surface is disposed to face the outer peripheral surface of the rotating shaft 3. The inner peripheral surface of the tip of the cylindrical portion 411 provided with the tip-side magnetic bearing 6 has an inner diameter so that the tips of the

magnetic pole portions

6a and 6b of the tip-side magnetic bearing 6 are substantially flush with other inner peripheral surfaces. Largely formed.

The rear end side magnetic bearing 7 includes

magnetic pole portions

7 a and 7 b provided on the inner peripheral surface of the support 4 and facing the outer peripheral surface of the rotary shaft 3, and the rotary shaft 3 is arranged in the radial direction on the rear end side. Non-contact support. The magnetic bearing 7 on the rear end side is provided on the rear end side with respect to the magnetic flux generation mechanism 5 and is provided outside the roller body 2. As described above, the magnetic bearing 7 on the rear end side is provided on the inner peripheral surface of the support 4 and the

magnetic pole portions

7 a and 7 b are opposed to the outer peripheral surface of the rotating shaft 3. This is because it is not provided so as to face the inner peripheral surface of the roller body 2.

Specifically, as shown in FIG. 1, the magnetic bearing 7 on the rear end side includes four magnetic bearings arranged at equal intervals in the circumferential direction on the inner peripheral surface of the support 4 (flange portion). Each magnetic bearing, like the magnetic bearing 6 on the front end side, is wound around a yoke 71 having a substantially U-shaped cross section in which

magnetic pole portions

7a and 7b are formed at both ends, and the

magnetic pole portions

7a and 7b of the yoke 71. Coil 72.

In addition, between the front end side magnetic bearing 6 and the rear end side magnetic bearing 7, for example, a rolling bearing or the like for urgently supporting the rotating shaft 3 when the

magnetic bearings

6 and 7 are stopped due to a power failure or the like. A touchdown bearing 12 such as a slide bearing is provided.

<Effect of this embodiment>
According to the induction heating roller device 100 according to the present embodiment configured as described above, the rotating shaft 3 is supported by the

magnetic bearings

6 and 7, so there is no wear when using a rolling bearing and the like. The service life can be greatly extended. Further, since the jacket body 21A in which the gas-liquid two-phase heat medium is sealed is provided in the roller body 2, the temperature in the axial direction of the roller body 2 can be made uniform. Furthermore, since the jacket chamber 21A is provided, the temperature can be made uniform even if the

magnetic bearings

6 and 7 are lengthened in the axial direction, so that the

magnetic bearings

6 and 7 can be enlarged in the axial direction, Support stability of the rotating shaft 3 and the roller body 2 can be improved. In addition, since the rotary shaft 3 is supported with the

magnetic bearings

6, 7 facing in the radial direction, the

magnetic bearings

6, 7 are considered without considering the positional relationship between the roller body 2 and the

magnetic bearings

6, 7. Can be arranged. In particular, the distance between the magnetic bearing 7 on the front end side and the magnetic bearing 7 on the rear end side can be increased such that the magnetic bearing 7 on the rear end side is arranged outside the roller body 2, and further support stability can be achieved. Can be improved.

<Other modified embodiments>
The present invention is not limited to the above embodiment.

For example, in the embodiment, the support 4 has one magnetic flux generation mechanism 5 in the axial direction, and the magnetic flux generation mechanism 5 is sandwiched between the magnetic bearing 6 on the front end side and the magnetic bearing 7 on the rear end side. However, as shown in FIG. 3, the support 4 may have two magnetic flux generation mechanisms 5 in the axial direction, and the magnetic bearing 6 on the front end side may be disposed between the magnetic flux generation mechanisms 5. .

Further, the number of magnetic flux generation mechanisms 5 is not limited to two, and three or more may be provided in the axial direction.

Furthermore, in the magnetic bearing of the above-described embodiment, the two-point magnetic bearing is arranged in the axial direction by the magnetic bearing 6 on the front end side and the magnetic bearing 7 on the rear end side. good.

In addition, the magnetic bearing 7 on the rear end side of the embodiment is disposed outside the roller body 2 at the front end side with respect to the drive motor 8, that is, disposed between the roller body 2 and the drive motor 8. However, as shown in FIG. 4, the rear end side of the drive motor 8, specifically, the drive motor 8 and the temperature detection device (rotary transformer) RTS may be arranged. .

In addition, in the above-described embodiment, the roller body 2 and the rotation shaft 3 are integrated so that the roller body 2 and the rotation shaft 3 do not rattle due to rotation. May be connected by a fastening element using taper fitting or the like.

In addition, it goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

According to the present invention, it is possible to improve the support stability by the magnetic bearing while ensuring the uniformity of the temperature of the roller body.

Claims

A bottomed cylindrical roller body having a jacket chamber filled with a gas-liquid two-phase heat medium and extending in the axial direction;
A rotation shaft provided at the center of the bottom of the roller body so as to be along the rotation center axis of the roller body;
The rotating shaft is inserted inside, and a magnetic flux generating mechanism is provided which is disposed in a hollow between the roller body and the rotating shaft and includes a cylindrical iron core and an induction coil wound around the cylindrical iron core. A support,
A radial magnetic bearing provided on the inner peripheral surface of the support body and having a magnetic pole portion facing the outer peripheral surface of the rotating shaft, and supporting the rotating shaft in a non-contact manner in the radial direction on the front end side and the rear end side;
An induction heating roller device comprising:
The induction heating roller device according to claim 1, wherein the radial magnetic bearing on the front end side is disposed inside the roller body, and the radial magnetic bearing on the rear end side is disposed outside the roller body.
The induction heat roller device according to claim 1, wherein the roller body and the rotating shaft are integrated.
The induction heating roller device according to claim 1, wherein the radial magnetic bearing on the tip side and the magnetic flux generation mechanism are provided so as not to overlap in the axial direction.
The induction heat roller apparatus according to claim 1, wherein a cooling fluid passage through which a cooling fluid flows is formed in a portion of the support where a radial magnetic bearing is provided.