Induction heating roller device

Abstract

To increase the outer diameter of a support shaft in a drive shaft while absorbing the deflection of the support shaft without providing a rolling bearing with an alignment function.SOLUTION: In an induction heating roller device 100 that inserts a support shaft 5 that supports an induction heating mechanism 3 through a drive shaft 41 fixed to a roller body 2, and holds the induction heating mechanism 3 inside the roller body 2 by supporting the support shaft 5 on the inner peripheral surface of the drive shaft 41 via a bearing mechanism 6, the bearing mechanism 6 includes a sleeve 61 interposed between the drive shaft 41 and the support shaft 5, a self-aligning bearing 62 provided between the drive shaft 41 and the sleeve 61 or between the support shaft 5 and the sleeve 61, and one or more rolling bearings 63a and 63b provided between the drive shaft 41 and the sleeve 61 or between the support shaft 5 and the sleeve 61, and the self-aligning bearing 62 and one or more rolling bearings 63a and 63b are arranged axially offset.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an induction heating roller device. [Background technology]

[0002] A conventional induction heating roller device, as shown in Patent Document 1, includes a rotating roller, a drive shaft connected to each end of the roller, an induction heating mechanism disposed inside the roller, and a support rod supporting each end of the induction heating mechanism, one of the support rods being supported on the inner surface of one of the drive shafts via a bearing mechanism having a self-aligning function. This bearing mechanism is provided between the inner circumferential surface of the drive shaft and the outer circumferential surface of the support rod, and is composed of a self-aligning bearing and a rolling bearing provided on the outside or inside of the self-aligning bearing.

[0003] However, when this bearing mechanism is used, the support rod becomes thin when the drive shaft is used as a reference, and the lead wire connected to the induction heating mechanism that runs through the support rod becomes thin. As a result, the desired power cannot be supplied to the induction heating mechanism, and the heating temperature of the roller body is restricted. It is also possible to use a special bearing that integrates a self-aligning bearing and a rolling bearing, but this would be expensive and impractical. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 3920082 Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention has been made to solve the above problems, and its main objective is to increase the outer diameter of the support shaft within the drive shaft while absorbing the deflection of the support shaft without providing an aligning function to the rolling bearing. [Means for solving the problem]

[0006] In other words, the induction heating roller device of the present invention is an induction heating roller device in which a support shaft supporting an induction heating mechanism is inserted into a drive shaft fixed to a roller body and the support shaft is supported on the inner peripheral surface of the drive shaft via a bearing mechanism, thereby holding the induction heating mechanism inside the roller body, and the bearing mechanism has a sleeve interposed between the drive shaft and the support shaft, a self-aligning bearing provided either between the drive shaft and the sleeve or between the support shaft and the sleeve, and one or more rolling bearings provided on the other side between the drive shaft and the sleeve or between the support shaft and the sleeve, and the self-aligning bearing and the one or more rolling bearings are arranged offset in the axial direction.

[0007] In this case, the self-aligning bearing and one or more rolling bearings are arranged axially offset via a sleeve provided between the drive shaft and the support shaft, so that the radial dimension of the bearing mechanism between the drive shaft and the support shaft can be made smaller than that of the conventional configuration in which the self-aligning bearing and the rolling bearing are arranged radially. As a result, the outer diameter of the support shaft in the drive shaft can be increased while absorbing the deflection of the support shaft without providing an aligning function to the rolling bearing. In addition, since the deflection of the support shaft can be absorbed without providing an aligning function to the rolling bearing, the deflection (bending deformation) of the support shaft is less likely to be applied to the rolling bearing, and the life of the rolling bearing can be extended. Furthermore, since the outer diameter of the support shaft can be increased, the lead wire led to the outside through the inside of the support shaft can be made thicker, and sufficient power can be supplied to the induction heating mechanism. Therefore, it is possible to prevent the heating temperature of the small-diameter roller body from being restricted. In addition, since there is no need to use a special bearing in which the self-aligning bearing and the rolling bearing are integrated, it is possible to suppress an increase in cost.

[0008] As a specific arrangement of the self-aligning bearing and the rolling bearing, it is desirable that the self-aligning bearing is provided between the support shaft and the sleeve, and the one or more rolling bearings are provided between the drive shaft and the sleeve. With this configuration, the bending of the support shaft is first absorbed by the self-aligning bearing, so that the bending of the support shaft acting on the rolling bearing can be further reduced.

[0009] When a self-aligning bearing and a rolling bearing are arranged between a drive shaft and a support shaft, in order to reduce the radial arrangement space for these bearings, it is desirable for the sleeve to have a large diameter portion to which the self-aligning bearing is fixed on its inner peripheral surface, and a small diameter portion to which the one or more rolling bearings are fixed on its outer peripheral surface.

[0010] Furthermore, when a self-aligning bearing and a rolling bearing are arranged between a drive shaft and a support shaft, in order to reduce the radial arrangement space for these bearings, it is desirable for the inner diameter of the one or more rolling bearings to be the same as or smaller than the outer diameter of the self-aligning bearing.

[0011] In order to facilitate replacement of the rolling bearings, it is possible to configure the support shaft so that the self-aligning bearing is provided on the axially inner side and the two rolling bearings are provided on the axially outer side. In this configuration, in order to reduce the load on the two rolling bearings and extend the life of the rolling bearings, it is desirable that the distance between the two rolling bearings is the same as or greater than the distance between the self-aligning bearing and the rolling bearing adjacent to it.

[0012] In order to allow the self-aligning bearing to absorb the deflection of the support shaft while the rolling bearing stably supports the support shaft, it is desirable that two of the rolling bearings are provided on the support shaft so as to sandwich the self-aligning bearing.

[0013] One specific embodiment of the self-aligning bearing is a sliding bearing having an inner ring with a spherical outer circumferential surface, and an outer ring having a spherical inner circumferential surface that is capable of sliding freely against the outer circumferential surface of the inner ring. Effect of the Invention

[0014] According to the present invention thus configured, it is possible to increase the outer diameter of the support shaft within the drive shaft while absorbing the deflection of the support shaft without providing the rolling bearing with an aligning function. [Brief description of the drawings]

[0015] [Figure 1] 1 is a cross-sectional view showing a schematic configuration of an induction heating roller device according to one embodiment of the present invention; [Diagram 2] 2 is a partial cross-sectional view showing a schematic configuration of the induction heating roller device of the embodiment; FIG. [Diagram 3] 13 is a partial cross-sectional view showing a schematic configuration of an induction heating roller device according to a modified embodiment. FIG. [Figure 4] 13 is a partial cross-sectional view showing a schematic configuration of an induction heating roller device according to a modified embodiment. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] <One embodiment of the present invention> An embodiment of an induction heating roller device 100 according to the present invention will now be described with reference to the drawings.

[0017] This induction heating roller device 100 is used in heat treatment processes for sheet or web materials such as plastic films, paper, cloth, nonwoven fabrics, synthetic fibers, and metal foils, and continuous materials such as wire (yarn) materials.

[0018] The induction heating roller device 100 of this embodiment includes a rotatably supported hollow cylindrical roller body 2 and an induction heating mechanism 3 provided inside the roller body 2, as shown in FIGS.

[0019] A journal 4 having a hollow drive shaft 41 is provided at each end of the roller body 2, and the drive shaft 41 is rotatably supported on a machine base 9 via bearings 8 such as rolling bearings. The journal 4 has the drive shaft 41 and a flange portion 42 fixed to the axial end of the roller body 2. The roller body 2 is configured to be rotated by a driving force applied from outside by a rotation drive mechanism (not shown) such as a motor.

[0020] The induction heating mechanism 3 includes a cylindrical iron core 31 having a cylindrical shape, and an induction coil 32 wound around the outer peripheral surface of the cylindrical iron core 31 .

[0021] Both ends of the cylindrical iron core 31 of the induction heating mechanism 3 are supported by support shafts 5, which are inserted into a drive shaft 41 fixed to the roller body 2 and rotatably supported on the inner circumferential surface of the drive shaft 41 via a bearing mechanism 6. The detailed configuration of the bearing mechanism 6 will be described later. As a result, the induction heating mechanism 3 is held stationary relative to the machine base 9 (fixed side) inside the rotating roller body 2.

[0022] A power supply lead wire L1 is connected to the induction coil 32, and this lead wire L1 is inserted into the support shaft on one axial side (the right side in FIG. 1) and led out to the outside. A power supply circuit (not shown) for applying AC voltage of commercial frequency (50 Hz or 60 Hz) is connected to the lead wire L1.

[0023] When an AC voltage is applied to the induction coil 32 by this induction heating mechanism 3, an alternating magnetic flux is generated, and this alternating magnetic flux passes through the side peripheral wall of the roller body 2. This passage generates an induced current in the roller body 2, and the roller body 2 generates Joule heat due to this induced current.

[0024] <Detailed configuration of bearing mechanism 6> The bearing mechanism 6 of this embodiment has a different configuration between one support shaft side (lead wire leading side) from which the lead wire L1 is led out and the other support shaft side (anti-lead wire leading side) from which the lead wire L1 is not led out.

[0025] 2, the bearing mechanism 6 on the lead wire outlet side has a cylindrical sleeve 61 interposed between the drive shaft 41 and the support shaft 5, a self-aligning bearing 62 provided between the support shaft 5 and the sleeve 61, and one or more rolling bearings 63a, 63b without self-aligning function provided between the drive shaft 41 and the sleeve 61. Note that, although a configuration having two rolling bearings 63a, 63b is shown in FIG. 2, the number may be one, or three or more.

[0026] The self-aligning bearing 62 and the two rolling bearings 63a, 63b are arranged offset in the axial direction. Specifically, the self-aligning bearing 62 and the two rolling bearings 63a, 63b are arranged so as not to overlap with each other in the axial direction, and in this embodiment, the self-aligning bearing 62 and the two rolling bearings 63a, 63b are arranged in order from the inside to the outside in the axial direction.

[0027] The self-aligning bearing 62 is a sliding bearing having an inner ring 621 with a spherical outer circumferential surface, and an outer ring 622 with a spherical inner circumferential surface that is slidable relative to the outer circumferential surface of the inner ring 621. The self-aligning bearing 62 is provided by being fitted into the outer circumferential surface of the support shaft 5, and is also fitted into the inner circumferential surface of the sleeve 61. The two rolling bearings 63a, 63b are provided by being fitted into the outer circumferential surface of the sleeve 61, and are also fitted into the inner circumferential surface of the drive shaft 41.

[0028] The sleeve 61 has a large diameter portion 611 to which the self-aligning bearing 62 is fixed on the inner peripheral surface, and a small diameter portion 612 to which two rolling bearings 63a, 63b are fixed side by side with a gap between them on the outer peripheral surface. The outer peripheral surface of the large diameter portion 611 of the sleeve 61 is provided with a gap between it and the inner peripheral surface of the drive shaft 41 so that the large diameter portion 611 does not contact the inner peripheral surface of the drive shaft 41. The inner peripheral surface of the small diameter portion 612 of the sleeve 61 is provided with a gap between it and the outer peripheral surface of the support shaft 5 so that the large diameter portion 611 does not contact the inner peripheral surface of the drive shaft 41 even if the support shaft 5 is bent. In other words, the inner peripheral surface of the sleeve 61 has a gap between the outer peripheral surface of the support shaft 5 over the entire circumferential direction, and the outer peripheral surface of the sleeve 61 has a gap between it and the inner peripheral surface of the drive shaft 41 over the entire circumferential direction.

[0029] In this manner, the self-aligning bearing 62 fixed to the inner peripheral surface of the large diameter portion 611 and the rolling bearings 63a, 63b fixed to the outer peripheral surface of the small diameter portion 612 are configured such that the inner diameters of the rolling bearings 63a, 63b are the same as or smaller than the outer diameter of the self-aligning bearing 62.

[0030] Also, in this embodiment, the support shaft 5 is configured such that the self-aligning bearing 62 is provided on the axially inner side and the two rolling bearings 63a, 63b are provided on the axially outer side, and the distance X2 between the centers of the two rolling bearings 63a, 63b is the same as or larger than the distance X1 between the centers of the self-aligning bearing 62 and the rolling bearing 63a adjacent to the self-aligning bearing 62. With this configuration, the load received by the two rolling bearings 63a, 63b can be reduced, thereby extending the life of the rolling bearings 63a, 63b.

[0031] Furthermore, in this embodiment, of the two rolling bearings 63a, 63b, the rolling bearing 63a closer to the self-aligning bearing 62 receives a larger load, so the rolling bearing 63a closer to the self-aligning bearing 62 is a cylindrical roller bearing, and the rolling bearing 63b farther from the self-aligning bearing 62 is a deep groove ball bearing. Note that the two rolling bearings 63a, 63b are not limited to these, and various rolling bearings can be used.

[0032] As shown in Fig. 1, the bearing mechanism 6 on the opposite side to the lead wire outlet has a self-aligning bearing 64 and a rolling bearing 65 at the same position in the axial direction. In Fig. 1, the self-aligning bearing 64 is fitted to the outer peripheral surface of the support shaft 5, and the rolling bearing 65 is fitted to the outer peripheral surface of the self-aligning bearing 64. The outer peripheral surface of the rolling bearing 65 is fitted to the inner peripheral surface of the drive shaft 41. In this way, the bearing mechanism 6 on the opposite side to the lead wire outlet has the self-aligning bearing 64 and the rolling bearing 65 arranged in the radial direction, so that the support shaft 5 is thinner than the lead wire outlet side. The bearing mechanism 6 on the opposite side to the lead wire outlet side may also be configured similarly to the bearing mechanism 6 on the lead wire outlet side.

[0033] <Effects of this embodiment> According to the induction heating roller device 100 configured in this manner, the self-aligning bearing 62 and one or more rolling bearings 63a, 63b are arranged axially offset via the sleeve 61 provided between the drive shaft 41 and the support shaft 5, so that the radial dimension of the bearing mechanism 6 between the drive shaft 41 and the support shaft 5 can be made smaller than in the conventional configuration in which the self-aligning bearing 62 and the rolling bearings 63a, 63b are arranged radially. As a result, the outer diameter of the support shaft 5 in the drive shaft 41 can be made large while absorbing the bending of the support shaft 5 without providing an aligning function to the rolling bearings 63a, 63b. In addition, since the bending of the support shaft 5 can be absorbed without providing an aligning function to the rolling bearings 63a, 63b, the bending (bending deformation) of the support shaft 5 is less likely to be applied to the rolling bearings 63a, 63b, and the life of the rolling bearings 63a, 63b can be extended. Furthermore, since the outer diameter of the support shaft 5 can be increased, the lead wire L1 that is led out through the inside of the support shaft 5 can be made thicker, and sufficient power can be supplied to the induction heating mechanism 3. This prevents restrictions on the heating temperature of the roller body 2. In addition, since there is no need to use a special bearing that integrates the self-aligning bearing 62 and the rolling bearings 63a and 63b, increases in costs can be suppressed.

[0034] In this embodiment, the self-aligning bearing 62 is provided between the support shaft 5 and the sleeve 61, and the rolling bearings 63a, 63b are provided between the drive shaft 41 and the sleeve 61. Therefore, the deflection of the support shaft 5 is first absorbed by the self-aligning bearing 62, and the deflection of the support shaft 5 applied to the rolling bearings 63a, 63b can be further reduced.

[0035] Furthermore, in this embodiment, the inner diameter of the rolling bearings 63a, 63b is the same as or smaller than the outer diameter of the self-aligning bearing 62. Therefore, when the self-aligning bearing 62 and the rolling bearings 63a, 63b are arranged between the drive shaft 41 and the support shaft 5, the radial arrangement space for the bearings 62, 63a, 63b can be reduced.

[0036] <Other embodiments> The present invention is not limited to the above-described embodiment, but may be modified as follows.

[0037] For example, as shown in FIG. 3, the support shaft 5 may be configured to have two rolling bearings 63a and 63b sandwiching the self-aligning bearing 62. In this configuration, a large diameter portion 611 is formed in the axial center of a cylindrical sleeve 61, to which the self-aligning bearing 62 is fixed on the inner peripheral surface, and a small diameter portion 612 is formed in the axial end of the sleeve 61, to which the rolling bearings 63a and 63b are fixed on the outer peripheral surface. In this configuration, in order to equally distribute the load applied to the two rolling bearings 63a and 63b and extend the life of the rolling bearings 63a and 63b, it is desirable to make the distance between each of the rolling bearings 63a and 63b and the self-aligning bearing 62 equal. In addition, the sleeve 61 may be configured to have divided elements 61a and 61b divided into a plurality of parts in the circumferential direction in order to provide the self-aligning bearing 62 on the large diameter portion 611 formed in the center. FIG. 3 shows a configuration divided into two parts in the circumferential direction.

[0038] In the above embodiment, the self-aligning bearing 62 is provided between the support shaft 5 and the sleeve 61, and the rolling bearings 63a, 63b are provided between the drive shaft 41 and the sleeve 61, but as shown in Fig. 4, the self-aligning bearing 62 may be provided between the drive shaft 41 and the sleeve 61, and the rolling bearings 63a, 63b may be provided between the support shaft 5 and the sleeve 61. In this case, the self-aligning bearing 62 is provided between the outer peripheral surface of the small diameter portion 612 of the sleeve 61 and the inner peripheral surface of the drive shaft 41, and the rolling bearings 63a, 63b are provided between the inner peripheral surface of the large diameter portion 611 of the sleeve 61 and the outer peripheral surface of the support shaft 5.

[0039] Furthermore, the present invention is not limited to the above-described embodiment, and it goes without saying that various modifications are possible without departing from the spirit and scope of the present invention. [Explanation of symbols]

[0040] 100...Induction heating roller device 2 Roller body 3. Induction heating mechanism 41 Drive shaft 5...Support shaft 6 Bearing mechanism 61 Sleeve 611...Large diameter section 612...Small diameter section 62 Self-aligning bearing 621...Inner circle 622 Outer ring 63a...Roller bearing 63b...Rolling bearing

Claims

1. An induction heating roller device in which a support shaft supporting an induction heating mechanism is inserted into a drive shaft fixed to a roller body, and the support shaft is supported on an inner peripheral surface of the drive shaft via a bearing mechanism, thereby holding the induction heating mechanism inside the roller body, the bearing mechanism includes a sleeve interposed between the drive shaft and the support shaft, a self-aligning bearing provided either between the drive shaft and the sleeve or between the support shaft and the sleeve, and one or a plurality of rolling bearings provided either between the drive shaft and the sleeve or between the support shaft and the sleeve, the self-aligning bearing and the one or more rolling bearings are arranged to be offset from each other in the axial direction; An induction heating roller device, wherein the sleeve has a large diameter portion to which one of the self-aligning bearing or the one or more rolling bearings provided between the support shaft and the sleeve is fixed on its inner peripheral surface, and a small diameter portion to which the other of the self-aligning bearing or the one or more rolling bearings provided between the drive shaft and the sleeve is fixed on its outer peripheral surface.

2. An induction heating roller device in which a support shaft supporting an induction heating mechanism is inserted into a drive shaft fixed to a roller body, and the support shaft is supported on an inner peripheral surface of the drive shaft via a bearing mechanism, thereby holding the induction heating mechanism inside the roller body, the bearing mechanism includes a sleeve interposed between the drive shaft and the support shaft, a self-aligning bearing provided either between the drive shaft and the sleeve or between the support shaft and the sleeve, and one or a plurality of rolling bearings provided either between the drive shaft and the sleeve or between the support shaft and the sleeve, the self-aligning bearing and the one or more rolling bearings are arranged to be offset from each other in the axial direction; An induction heating roller device in which the inner diameter of the other of the self-aligning bearing or the one or more rolling bearings provided between the drive shaft and the sleeve is the same as or smaller than the outer diameter of one of the self-aligning bearings or the one or more rolling bearings provided between the support shaft and the sleeve.

3. The self-aligning bearing is provided on an axially inner side of the support shaft, and the two rolling bearings are provided on an axially outer side of the support shaft, 3. The induction heating roller device according to claim 1, wherein the distance between the two rolling bearings is equal to or greater than the distance between the self-aligning bearing and the rolling bearing adjacent to the self-aligning bearing.

4. 3. The induction heating roller device according to claim 1, wherein the support shaft is provided with two of the rolling bearings so as to sandwich the self-aligning bearing therebetween.

5. 5. The induction heating roller device according to claim 1, wherein the self-aligning bearing is a sliding bearing having an inner ring having a spherical outer circumferential surface, and an outer ring having a spherical inner circumferential surface that is slidable relative to the outer circumferential surface of the inner ring.

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