JP2018045800A - Induction heat generation roller device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress various failures caused by arranging a roll bearing between a roller body and a stationary member in an induction heat generation roller device and to reduce the bias of a magnetic repulsive force caused by a permanent magnet.SOLUTION: The induction heat generation roller device includes a hollow roller body 2 which is freely rotatably supported, a stationary member 3 which includes at least an induction coil 312 and is arranged in a still state in the hollow space of the roller body 2, a rotation-side permanent magnet part 4 and a stationary-side permanent magnet part 5 which are provided in the roller body 2 and the stationary member 3 and support the stationary member 3 in a non-contact manner to the roller body 2, and a magnet holder 5X which is interposed between the stationary member 3 and the stationary-side permanent magnet part 5 and holds the stationary-side permanent magnet part 5. The magnet holder 5X is attached so that the stationary-side permanent magnet part 5 is rockable with respect to the rotation-side permanent magnet part 4.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an induction heat roller device.

  Conventionally, for example, a continuous heat treatment process for a sheet material such as plastic film, paper, cloth, non-woven fabric, synthetic fiber, metal foil, or a continuous material such as a web material, a wire (thread) material, etc., is guided inside the rotating roller body. An induction heating roller device is used in which a heating mechanism is arranged to cause Joule heating of the peripheral wall portion of the roller body by an induced current.

  In this induction heating roller device, a support body that supports an induction heating mechanism is provided inside the roller body, and the support body is supported by the roller body via a rolling bearing. Specifically, a rolling bearing is provided between the outer peripheral surface of the support and the inner peripheral surface of the journal portion of the roller body.

JP 2000-277245 A

  However, there is a problem that the rolling bearing is stressed by the deflection of the support that supports the induction heating mechanism, and the life of the rolling bearing is shortened. In addition, since the life of the rolling bearing differs depending on the use conditions such as the number of rotations of the roller body and the use temperature, the induction heat roller device needs to be replaced at a different timing. Furthermore, it is necessary to perform maintenance work such as lubrication on the rolling bearing. In addition, due to the structure in which the rolling bearing is arranged on the outer peripheral surface of the support, the radial dimension of the journal portion increases, which may hinder the design of the apparatus for mounting the roller body. Further, when the radial dimension of the journal portion is increased, the diameter of the roller body is hindered by the radial dimension.

  On the other hand, this inventor has considered the structure which supports a support body non-contactingly with respect to a roller main body using a permanent magnet, without using a rolling bearing. At this time, the magnetic repulsion force is biased due to individual differences of the permanent magnets, mounting accuracy, and the like, and it becomes difficult to stably support the induction heating mechanism for the roller body and the support body that supports the induction heating mechanism.

  Therefore, the present invention has been made to solve the above-described problems. In the induction heating roller device, various problems caused by providing a rolling bearing between the roller main body and the stationary member are suppressed, and the magnetism generated by the permanent magnet is reduced. The main problem is to reduce the bias of the repulsive force.

  That is, an induction heating roller device according to the present invention includes a hollow roller body that is rotatably supported, a stationary member that has at least an induction coil, and is disposed in a stationary state in the hollow of the roller body, and the roller A rotation-side permanent magnet and a stationary-side permanent magnet that are provided on the main body and the stationary member and support the stationary member in a non-contact manner with respect to the roller body, and are interposed between the stationary member and the stationary-side permanent magnet; A magnet holder that holds the stationary permanent magnet, and the magnet holder is attached so that the stationary permanent magnet can swing with respect to the rotating permanent magnet. To do.

According to this induction heating roller device, since the rolling bearing can be made unnecessary, maintenance work such as replacement of the bearing and lubrication due to deterioration of the rolling bearing can be made unnecessary. In addition, since the stationary member is supported by the rotation-side permanent magnet and the roller body in a non-contact manner by the stationary-side permanent magnet, no rolling bearing installation space is required between the stationary member and the roller body, and the rolling bearing is installed. Therefore, it is possible to prevent an increase in the radial dimension and to reduce the diameter.
Particularly in the present invention, the magnet holder for holding the stationary permanent magnet is attached so that the stationary permanent magnet can swing relative to the rotating permanent magnet. The magnet holder can be tilted according to the bias of the magnetic repulsive force generated between the magnets, and the bias of the magnetic repulsive force can be reduced. Thereby, a stationary member can be stably supported with respect to a roller main body.

  Specifically, the magnet holder is swingably attached so as to reduce the bias of the magnetic repulsion force mainly along the axial direction of the roller body. That is, the magnet holder is swingably attached so as to be inclined with respect to a plane including at least the axial direction of the roller body.

Preferably, the magnet holder has a cylindrical shape that is mounted on the mounting portion of the stationary member, and the stationary permanent magnet is provided over the entire circumferential direction of the magnet holder. Here, the provision over the entire circumferential direction includes a configuration provided continuously over the entire circumferential direction or a configuration provided intermittently over the entire circumferential direction.
If it is this structure, a stationary side permanent magnet can be arrange | positioned to the whole circumferential direction of a stationary member by mounting | wearing a mounting part with a magnet holding member. Moreover, it can be set as the structure which can rock | fluctuate so that a stationary side permanent magnet may reduce the bias | inclination of a magnetic repulsion force over the whole circumferential direction.

As a specific configuration for enabling the magnet holder to swing with respect to a plane including the axial direction of the roller body, either one of the opposing surfaces of the magnet holder and the mounting portion is arranged on the other opposing surface. It is desirable to have a protruding portion that protrudes toward the surface, and that the other opposing surface is in contact with the protruding portion and can swing.
With this configuration, the magnet holder swings about the protrusion as a swing center simply by forming the protrusion, and the configuration can be simplified.

  In order to suitably reduce the bias of the magnetic repulsion force along the axial direction of the roller body, a plurality of stationary-side permanent magnets are provided along the axial direction on the outer peripheral surface of the magnet holder, It is desirable that the protrusion is located at the center of the stationary permanent magnet in the axial direction.

A rotation-side yoke and a stationary-side yoke provided on both sides of each of the rotation-side permanent magnet and the stationary-side permanent magnet in the axial direction of the roller body, and arranged opposite to each other in a direction orthogonal to the axial direction; desirable.
If it is this structure, the magnetic force of a rotation side permanent magnet and a stationary side permanent magnet can be strengthened, and those repulsive forces can be raised. Thereby, the support force of the stationary member with respect to the roller body can be increased without depending only on the size of the permanent magnet, and the non-contact support of the stationary member can be stabilized.

  If the rotation side yoke and the stationary side yoke are provided on the magnet holder, the configuration can be simplified and the assembly can be facilitated.

  According to the present invention configured as described above, various problems due to the provision of a rolling bearing between the roller body and the stationary member in the induction heat roller device can be suppressed, and the bias of the magnetic repulsive force due to the permanent magnet can be reduced. Can do.

It is sectional drawing which shows typically the structure of the induction heating roller apparatus of this embodiment. It is a partial expanded sectional view which shows the structure of the rotation side permanent magnet part of the same embodiment, and a stationary side permanent magnet part. It is the figure seen from the direction orthogonal to the axial direction which shows the structure of the magnet unit of the embodiment. It is sectional drawing which shows the structure of the magnet holding body of the embodiment. It is sectional drawing which shows typically the mode of the rocking | fluctuation of the magnet holder of the embodiment. It is sectional drawing which shows typically the structure of the 2nd rotation side permanent magnet part of the same embodiment, and a 2nd stationary side permanent magnet part.

  The induction heating roller device 100 according to the present embodiment is, for example, in a continuous heat treatment process of a continuous material such as a sheet material such as a plastic film, paper, cloth, nonwoven fabric, synthetic fiber, and metal foil, a web material, and a wire (thread) material. It is used.

<Device configuration>
Specifically, as shown in FIG. 1, the induction heat roller device 100 includes a hollow cylindrical roller body 2 that is rotatably supported, and a stationary member 3 that is disposed in a stationary state in the hollow of the roller body 2. And a rotating-side permanent magnet portion 4 and a stationary-side permanent magnet portion 5 that support the stationary member 3 in the radial direction in a non-contact manner with respect to the roller body 2.

  The roller body 2 includes a cylindrical shell portion 21 and a pair of journal portions 22 provided at both ends of the shell portion 21. The journal portion 22 includes a flange portion 221 that covers the end opening of the shell portion 21, and a hollow drive shaft 222 that is integrally formed with the flange portion 221. The drive shaft 222 is rotatably supported by the machine base 62 via a bearing 61 such as a rolling bearing. The roller body 2 is configured to be rotated by a driving force applied from the outside, for example, by a motor or the like.

  The stationary member 3 includes an induction heat generating mechanism 31 for causing the shell portion 21 of the roller body 2 to generate heat, and a support body 32 having an axial shape for supporting the induction heat generating mechanism 31.

  The induction heat generating mechanism 31 includes a cylindrical iron core 311 having a cylindrical shape and an induction coil 312 wound around the outer peripheral surface of the cylindrical iron core 311. And the support body 32 is attached to each of the both ends of the cylindrical iron core 311. Each of the support bodies 32 is inserted into the drive shaft 222 and is rotatably supported by the drive shaft 222 by the rotation-side permanent magnet portion 4 and the stationary-side permanent magnet portion 5. In addition, the support body 32 of this embodiment is being fixed to the stationary side members, such as the machine base 62, with the fixture 63 so that it may not rotate.

  Thus, the induction heat generating mechanism 31 is supported in a suspended state inside the roller body 2 and is held stationary regardless of the rotation of the roller body 2. A lead wire (not shown) is connected to the induction coil 312, and an AC power source (not shown) for applying an AC voltage is connected to the lead wire via a power adjustment device (not shown). ing.

  By such an induction heating mechanism 31, an alternating magnetic flux is generated when an AC voltage is applied to the induction coil 312, and the alternating magnetic flux passes through the shell portion 21 of the roller body 2. This passage generates an induced current in the shell portion 21, and the shell portion 21 generates Joule heat by the induced current.

  The rotation-side permanent magnet portion 4 and the stationary-side permanent magnet portion 5 are provided on the roller body 2 and the stationary member 3 and are arranged around the rotation axis C of the roller body 2 and in a direction orthogonal to the rotation axis C. The electrodes are arranged so as to repel each other, that is, so that the polarities of the surfaces facing each other are the same.

  Although the rotation side permanent magnet part 4 and the stationary side permanent magnet part 5 of this embodiment use a neodymium magnet, other than that, an alnico magnet or a ferrite magnet may be used.

  Specifically, the rotation-side permanent magnet unit 4 includes a plurality of rotation-side permanent magnets (magnet units) 4U that are divided in the axial direction of the rotation axis C, as shown in FIGS. The plurality of magnet units 4U are mounted on a mounting portion formed on the inner peripheral surface of the drive shaft 222 of the roller body 2, and are fixed by fixing the rotation-side pressing member 10 to the drive shaft 222.

  Each magnet unit 4U is formed as a unit by a plurality (six in FIG. 3) of permanent magnet elements 4a to 4f provided radially at equal intervals on a plane orthogonal to the rotation axis C.

  As shown in FIG. 3, the plurality of permanent magnet elements 4 a to 4 f have the same shape as each other, for example, a fan shape obtained by dividing an annular ring in the circumferential direction. And each permanent magnet element 4a-4f has an equal cross-sectional shape in an axial direction, The front end surface (inner side surface) 41 has comprised the concave circular arc shape. The plurality of permanent magnet elements 4a to 4f configured in this way are arranged such that their tip surfaces 41 are located on the same circle as viewed from the axial direction. The polarities of the tip surfaces 41 of the plurality of permanent magnet elements 4a to 4f are N poles. Each magnet unit 4U may be composed of a plurality of permanent magnet elements other than six, and is not limited to being equally divided.

  Further, as shown in FIGS. 2 and 3, the stationary-side permanent magnet portion 5 is also a plurality of stationary-side permanent magnets (magnet units) divided in the axial direction of the rotation axis C, similarly to the rotating-side permanent magnet portion 4. 5U.

  Each magnet unit 5U is provided corresponding to the rotation-side permanent magnet 4U of the rotation-side permanent magnet portion 4, and a plurality of (six in FIG. 3) permanents are provided radially on a plane orthogonal to the rotation axis C. The magnet elements 5a to 5f are unitized.

  As shown in FIG. 3, the plurality of permanent magnet elements 5 a to 5 f have the same shape as each other, for example, a fan shape obtained by dividing an annular ring in the circumferential direction. And each permanent magnet element 5a-5f has an equal cross-sectional shape in an axial direction, The front end surface (outer surface) 51 has the permanent magnet element 4a which comprises the magnet unit 4U of the rotation side permanent magnet part 4. FIG. A protruding arc shape corresponding to the tip surface 41 of ˜4f is formed. The plurality of permanent magnet elements 5a to 5f configured in this way are arranged such that their front end surfaces 51 are located on the same circle when viewed from the axial direction. In addition, the polarity of the front end surface 51 of the plurality of permanent magnet elements 5 a to 5 f is the N pole, like the rotation side permanent magnet portion 4. Further, each magnet unit 5U may be composed of a plurality of permanent magnet elements other than six, and is not limited to being equally divided.

  Therefore, in the induction heating roller device 100 of the present embodiment, as shown in FIG. 2 in particular, the magnet holding unit that is interposed between the stationary member 3 and the stationary side permanent magnet unit 5 and holds the stationary side permanent magnet unit 5. A body 5X is provided.

  As shown in FIGS. 2 and 4, the magnet holder 5 </ b> X has a cylindrical shape that is attached to a mounting portion 321 formed at an end portion in the axial direction of the support body 32. The magnet holder 5X is attached to be swingable by fixing the stationary side pressing member 12 to the support body 32.

  The stationary side permanent magnet portion 5 is provided over the entire circumferential direction on the outer peripheral surface of the magnet holder 5X. Specifically, the magnet holding body 5X has a rotating body shape, and an attachment recess 5X1 for attaching a plurality of stationary-side permanent magnets (magnet units 5U) in the axial direction is provided in the axial direction on the outer peripheral surface thereof. It is formed at equal intervals along. In addition, the convex part 5X2 located in the both sides of this attachment recessed part 5X1 becomes the stationary side yoke 5Y mentioned later.

  The magnet holder 5 </ b> X is attached to the mounting portion 321 of the support body 32 so that the stationary permanent magnet portion 5 can swing with respect to the rotating permanent magnet portion 4. Specifically, the magnet holder 5X is swingably attached so as to be inclined with respect to a plane including the rotation axis C of the roller body 2. As a result, the permanent magnet elements 5a to 5f constituting the magnet unit 5U of the stationary side permanent magnet part 5 with respect to the tip surfaces 41 of the permanent magnet elements 4a to 4f constituting the magnet unit 4U of the rotation side permanent magnet part 4 are arranged. The tip surface 51 can be inclined.

  Specifically, a protruding portion 5X3 that protrudes toward the outer peripheral surface of the mounting portion 321 is formed on the inner peripheral surface of the magnet holder 5X. The projecting portion 5X3 has an arc-shaped cross section along the axial direction of the roller body 2, and is continuously formed over the entire inner circumferential surface of the magnet holder 5X.

  The protrusion 5X3 is formed at the axial center of the magnet holder 5X. A plurality of stationary-side permanent magnets (magnet units 5U) are provided vertically symmetrically with respect to the axial center on the outer peripheral surface of the magnet holder 5X, and the protruding portion 5X3 has a plurality of magnet units 5U in the axial direction. It will be located in the center of. The inner diameter of the apex portion of the protruding portion 5X3 is slightly larger than the outer diameter of the mounting portion 321 and is attached with rattling.

  In this configuration, as shown in FIG. 5, the magnet holder 5 </ b> X has the roller body 2 in accordance with the bias of the magnetic repulsion force in the axial direction of the rotation axis C of the roller body 2 and the bias of the magnetic repulsion force in the circumferential direction. It swings so that the central axis C ′ of the magnet holder 5X is inclined with respect to the rotation axis C.

  Furthermore, in the induction heating roller device of this embodiment, as shown in FIG. 2, the rotation-side permanent magnet portion 4 is provided on the rotation side provided on both sides of the rotation-side permanent magnet (magnet unit 4 </ b> U) in the axial direction of the roller body 2. It has a yoke 4Y. In addition, the stationary side permanent magnet portion 5 has stationary side yokes 5Y provided on both sides of the stationary side permanent magnet (magnet unit 5U) in the axial direction. The rotation-side yoke 4Y and the stationary-side yoke 5Y are arranged to face each other in the direction orthogonal to the rotation axis C.

  The rotation-side yoke 4Y has an annular shape, and is provided on both sides of each of a plurality of rotation-side permanent magnets (magnet units 4U). In the present embodiment, five rotation-side yokes 4Y are provided on both sides of each of the four rotation-side permanent magnets (magnet unit 4U). In the present embodiment, the polarity of the front end surface (inner side surface) of the rotation side yoke 4Y is the S pole.

  The stationary-side yoke 5Y has an annular shape formed integrally with the magnet holder 5X, and is provided on both sides of each of the plurality of stationary-side permanent magnets (magnet units 5U). In the present embodiment, the stationary side yoke 5Y is configured by the convex portion 5X2 of the magnet holder 5X, and is provided on the five stationary side yokes 5Y on both sides of each of the four stationary side permanent magnets (magnet unit 5U). Yes. In the present embodiment, the polarity of the distal end surface (outer surface) of the stationary side yoke 5Y is the S pole. Thereby, the front end surface of the rotation side yoke 4Y and the front end surface of the stationary side yoke 5Y facing it have the same polarity.

<Effect of this embodiment>
According to the induction heating roller device 100 configured in this way, the rolling bearing that supports the stationary member 3 can be eliminated, and therefore maintenance work such as replacement of the bearing and lubrication due to deterioration of the rolling bearing is eliminated. be able to.

  In addition, since the stationary member 3 is supported by the rotation-side permanent magnet portion 4 and the stationary-side permanent magnet portion 5 in a non-contact manner on the roller body 2, a space for installing the rolling bearing is required between the stationary member 3 and the roller body 2. In addition, an increase in the radial dimension due to the installation of the rolling bearing can be prevented, and the diameter of the roller body 2, particularly the journal portion 22, can be reduced.

  In particular, in this embodiment, the magnet holder 5X that holds the stationary permanent magnet unit 5 is attached so that the stationary permanent magnet unit 5 can swing with respect to the rotating permanent magnet unit 4. The bias of the magnetic repulsion force generated between the rotation side permanent magnet part 4 and the stationary side permanent magnet part 5 can be reduced. Thereby, the stationary member 3 can be stably supported with respect to the roller body 2.

  Further, by mounting the cylindrical magnet holder 5X on the mounting portion 321 of the support body 32, the stationary permanent magnet section 5 can be disposed in the entire circumferential direction of the support body 32. Attachment of the part 5 to the support body 32 can be facilitated. In addition, since the protrusion 5X3 is provided on the magnet holder 5X, the mounting portion 321 of the support 32 can be formed in an equal cross-sectional shape, and the processing can be facilitated.

  In addition, since the rotation-side yoke 4Y and the stationary-side yoke 5Y are provided on both sides of the rotation-side permanent magnet (magnet unit 4U) and the stationary-side permanent magnet (magnet unit 5U), the rotation-side permanent magnet and the stationary-side permanent magnet are provided. These magnetic forces can be strengthened to increase their repulsive force. Thereby, the supporting force of the stationary member 3 with respect to the roller main body 2 can be increased without depending only on the size of the permanent magnet, and the non-contact support of the stationary member 3 can be stabilized.

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

  For example, in the above embodiment, the protrusion 5X3 is provided on the inner peripheral surface of the magnet holder 5X so as to be swingable. However, the protrusion is provided on the outer peripheral surface of the mounting portion 321. You may comprise.

  Further, the projecting portion is not integrally formed with the magnet holder 5X or the mounting portion 321 but may be formed separately and fixed to the magnet holder 5X or the mounting portion 321.

  Furthermore, the protrusions may be formed intermittently in the circumferential direction in addition to those formed in the entire circumferential direction.

  In addition, the cross-sectional shape of the tip of the protruding portion is not limited to an arc shape, and may be a curved surface shape or a bent shape as long as it can come into contact with the rocking portion.

In addition, in the above-described embodiment, the positioning of the stationary member 3 in the axial direction with respect to the roller body 2 is performed by the fixing bracket 63. However, as shown in FIG. The second rotating side permanent magnet portion 7 and the second stationary side permanent magnet portion 8 for positioning without contact in the direction (thrust direction) may be used.
The second rotation-side permanent magnet portion 7 and the second stationary-side permanent magnet portion 8 are provided on the roller body 2 and the stationary member 3, and are disposed so as to face each other in the axial direction of the roller body 2. Specifically, the second stationary side permanent magnet portion 8 is disposed so as to sandwich the second rotating side permanent magnet portion 7 from both sides in the axial direction. The second rotation-side permanent magnet portion 7 is supported by a magnet holder 7H attached to the journal portion 22 of the roller body 2, and the second stationary-side permanent magnet portion 8 is attached to the axial end of the support body 32. It is supported by the magnet housing 8H.
Thereby, the axial positioning of the stationary member 3 with respect to the roller body 2 can be performed in a non-contact manner using the second rotating side permanent magnet portion 7 and the second stationary side permanent magnet portion 8. Therefore, the positional deviation in the axial direction caused by non-contact support of the stationary member 3 in the radial direction by the rotation-side permanent magnet portion 4 and the stationary-side permanent magnet portion 5 can be eliminated with a simple and compact configuration.

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

DESCRIPTION OF SYMBOLS 100 ... Induction heating roller apparatus 2 ... Roller main body C ... Rotating shaft 3 ... Static member 312 ... Induction coil 4 ... Rotation side permanent magnet part 4U ... Magnet unit 4a-4d ... Permanent magnet element 5 ... Static side permanent magnet part 5U ... Magnet units 5a to 5d ... Permanent magnet element

Claims (6)

A hollow roller body rotatably supported;
A stationary member having at least an induction coil and disposed stationary in the hollow of the roller body;
A rotation-side permanent magnet and a stationary-side permanent magnet that are provided on the roller body and the stationary member and support the stationary member in a non-contact manner with respect to the roller body;
A magnet holder interposed between the stationary member and the stationary permanent magnet, and holding the stationary permanent magnet;
The induction heating roller device, wherein the magnet holder is attached so that the stationary permanent magnet can swing relative to the rotating permanent magnet. The magnet holder has a cylindrical shape that is mounted on the mounting portion of the stationary member,
The induction heat roller device according to claim 1, wherein the stationary permanent magnet is provided over the entire circumferential direction of the magnet holder. Either one of the opposing surfaces of the magnet holder and the mounting portion has a protruding portion that protrudes toward the other opposing surface,
The induction heating roller device according to claim 2, wherein the other opposing surface is brought into contact with the protrusion and can be swung. A plurality of stationary side permanent magnets are provided along the axial direction of the roller body on the outer peripheral surface of the magnet holder,
The induction heating roller device according to claim 3, wherein the protruding portion is located in a central portion of the stationary permanent magnet in the axial direction.   A rotation-side yoke and a stationary-side yoke that are provided on both sides of each of the rotation-side permanent magnet and the stationary-side permanent magnet in the axial direction of the roller body, and are opposed to each other in a direction orthogonal to the axial direction. Item 5. The induction heating roller device according to any one of Items 1 to 4.   The induction heating roller device according to claim 5, wherein the rotation side yoke and the stationary side yoke are provided on the magnet holder.