Induction heating roller device

Abstract

To increase a rotation speed of a roller body, miniaturize a cantilevered induction heating roller device, and obtain torque and capacity of a motor required for the cantilevered induction heating roller device.SOLUTION: An induction heating roller device includes a fixed shaft cantilevered on a machine base, a cylindrical roller body rotatably supported by the fixed shaft via a bearing, an induction heating mechanism that is provided inside the roller body and causes the roller body to generate heat by induction, and an axial gap motor installed between the machine base and the roller body to rotate the roller body with respect to the fixed shaft.SELECTED DRAWING: Figure 1

Description

Technical Field

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

Background Art

[0002] In the manufacturing process of synthetic fibers such as nylon and polyester, a direct stretching process is performed in which, after spinning, the fibers are heated and stretched in the longitudinal direction to align the molecular orientation and improve properties such as tensile strength and elastic modulus.

[0003] In this direct stretching process, a plurality of cantilever-type induction heating roller devices are used to heat the synthetic fibers and stretch them by the rotational speed difference between the induction heating roller devices.

[0004] As shown in Patent Document 1, this cantilever-type 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 core and an induction coil disposed inside the roller body. The tip of the rotating shaft of the motor is fitted and connected to the shaft fitting portion of the roller body to support the roller body in a cantilever manner, and the roller body is configured to rotate by the motor.

[0005] Specifically, in the above induction heating roller device, a cylindrical portion for supporting the magnetic flux generation mechanism is provided inside the roller body, and the rotating shaft of the motor is supported by a rolling bearing on the inner circumferential surface of the cylindrical portion.

[0006] However, in a configuration where the rotating shaft of the motor is supported by a rolling bearing, the roller body cannot be rotated at a speed higher than the critical speed of the rotating shaft corresponding to the resonance frequency determined by the mass of the members constituting the rotating system and the rigidity determined by its material.

[0007] As a countermeasure, increasing the size of the rolling bearings and thus the outer diameter of the rotating shaft can increase the rigidity of the rotating shaft and raise the critical speed. However, as the size of the rolling bearings increases, the maximum allowable rotational speed of the bearings themselves decreases. Thus, there is a problem in that the critical speed is determined by the trade-off between the rigidity of the rotating shaft and the size of the rolling bearings, and the maximum rotational speed of the roller body is determined as a result.

[0008] Furthermore, as shown in Patent Document 2, a configuration is also considered in which a motor stator is fitted and fixed to the inner diameter side of the hot roller rotor and heater coil, and a motor rotor and a shaft to which the motor rotor is fixed are arranged opposite the motor stator. The shaft is coupled to the hot roller rotor. The shaft is rotatably supported via a bearing by a cover connected to the hot roller boss portion on which the heater coil is provided.

[0009] While this configuration allows for a reduction in the area required for installing the induction heating roller device, it remains constrained by the critical speed of the shaft. Furthermore, the arrangement of the motor stator and motor rotor is limited to the inner diameter of the heater coil, making it difficult to use a motor that can deliver the required rotational torque and capacity. On the other hand, increasing the outer diameter of the hot roller rotor to enlarge the inner diameter of the heater coil would result in an increase in the weight and moment of inertia of the hot roller rotor, creating a contradiction that necessitates an even larger motor. [Prior art documents] [Patent Documents]

[0010] [Patent Document 1] Japanese Patent Publication No. 2009-163968 [Patent Document 2] Japanese Patent Application Publication No. 6-111920 [Overview of the project] [Problems that the invention aims to solve]

[0011] Therefore, the present invention was made to solve the above problems, and its main objectives are not only to increase the rotation speed of the roller body, but also to miniaturize the cantilevered induction heating roller device and to obtain the torque and capacity of the motor required for the cantilevered induction heating roller device. [Means for solving the problem]

[0012] In other words, the induction heating roller device according to the present invention is characterized by comprising: a fixed shaft cantilevered to a machine base; a cylindrical roller body rotatably supported on the fixed shaft via a bearing; an induction heating mechanism provided inside the roller body to induce heating of the roller body; and an axial gap motor provided between the machine base and the roller body to rotate the roller body relative to the fixed shaft.

[0013] With this design, since there is no rotating shaft, there is no restriction on critical speed, and it becomes easy to increase the rotation speed of the roller body. Also, because an axial gap motor is used, the cantilevered induction heating roller device can be made smaller compared to conventional radial gap motors, significantly reducing the area required for installation and saving space. Furthermore, the rotor and stator of the axial gap motor can be made to the same size as the outer diameter of the roller body, and the motor torque and capacity required for the cantilevered induction heating roller device can be obtained. Moreover, since the axial gap motor is installed outside the roller body, the axial dimensions of the induction heating mechanism installed inside the roller body can be made as large as possible.

[0014] As a specific embodiment of the axial gap motor, it is conceivable that the axial gap motor comprises a disc-shaped rotor having a plurality of permanent magnets arranged around the rotation axis of the roller body and provided on the machine-frame side end face of the roller body facing the machine frame side, and a disc-shaped stator having a plurality of magnetic poles facing the rotor in the rotation axis direction of the roller body and provided on the machine frame or the fixed shaft opposite to the machine-frame side end face.

[0015] In order to prevent bearing damage by cooling the bearing, it is desirable that a refrigerant flow path is formed inside the fixed shaft through which the refrigerant flows.

[0016] In order to cool not only the bearings but also the stator, it is desirable that the refrigerant flow path cools both the bearings and the stator.

[0017] In a specific embodiment of the fixed shaft, it is desirable that the fixed shaft has a support shaft portion that supports the roller body and a fixed flange portion formed at the base end of the support shaft portion and fixed to the machine base, with the stator provided on the fixed flange portion.

[0018] In specific implementations for cooling the bearing and stator, it is desirable that a bearing cooling channel for cooling the bearing is formed inside the support shaft portion, and a stator cooling channel for cooling the stator is formed inside the fixed flange portion.

[0019] In order to lubricate and cool the bearings and cool the axial gap motor, it is desirable that the refrigerant passage carries a refrigerant containing lubricating oil, opens to the outer circumferential surface of the fixed shaft, and supplies a mist-like refrigerant to the bearings and the axial gap motor.

[0020] In order to reduce the heat transfer from the induction-heated roller body to the rotor and prevent the rotor from being overheated, it is desirable that a heat insulating layer is formed between the machine base side end face of the roller body and the rotor.

[0021] As a specific embodiment of forming the heat insulating layer, it is desirable that the rotor is fixed to the machine base side end face by an annular fixing member, and the heat insulating layer is formed by the fixing member. By forming the heat insulating layer with the fixing member in this way, the device configuration for heat insulation can be simplified.

[0022] It is desirable that the fixing member has a concave groove opening on the entire outer peripheral surface, and the heat insulating layer is formed by the concave groove. With this configuration, the back side of the rotor can be actively air-cooled.

[0023] Inside the fixed shaft, a refrigerant flow path through which the refrigerant flows is formed. The refrigerant flow path opens to the outer peripheral surface of the fixed shaft and supplies the refrigerant to the axial gap motor. It is desirable that an internal flow path through which the refrigerant flows from the radially inner side to the radially outer side is formed inside the fixing member. With this configuration, since an internal flow path through which the refrigerant flows is formed in the fixing member, the heat insulating performance of the fixing member can be improved, and the rotor can be actively cooled.

[0024] Inside the fixed shaft, a refrigerant flow path through which the refrigerant flows is formed. The refrigerant flow path opens to the outer peripheral surface of the fixed shaft and supplies the refrigerant to the axial gap motor. It is desirable that a flow path through which the refrigerant flows from the radially inner side to the radially outer side is formed between the permanent magnets adjacent to each other in the rotor. With this configuration, since a flow path through which the refrigerant flows is formed between the permanent magnets adjacent to each other in the rotor, the permanent magnets of the rotor can be actively cooled.

Advantages of the Invention

[0025] According to the present invention configured as described above, not only can the rotation of the roller body be accelerated, but the induction heating roller device can be miniaturized, and the torque and capacity of the motor required for the induction heating roller device can be obtained.

Brief Description of the Drawings

[0026] [Figure 1] It is a cross-sectional view schematically showing the configuration of a cantilever-type induction heating roller device according to an embodiment of the present invention. [Figure 2] It is a cross-sectional view schematically showing the configuration of a cantilever-type induction heating roller device of a modified embodiment. [Figure 3] It is a cross-sectional view schematically showing the configuration of a cantilever-type induction heating roller device of a modified embodiment. [Figure 4] It is a cross-sectional view schematically showing the configuration of a cantilever-type induction heating roller device of a modified embodiment. [Figure 5] It is a cross-sectional view along the axial direction of (a1) Configuration Example 1 of the fixing member, a cross-sectional view orthogonal to the axial direction, and a cross-sectional view along the axial direction of (b1) Configuration Example 2 of the fixing member, and a cross-sectional view orthogonal to the axial direction. [Figure 6] It is a cross-sectional view schematically showing the configuration of a cantilever-type induction heating roller device of a modified embodiment. [Figure 7] It is a (a) partial cross-sectional view, (b) perspective view of the rotor, and (c) schematic view showing the flow of the refrigerant, which schematically shows the configuration of a cantilever-type induction heating roller device of a modified embodiment.

Modes for Carrying Out the Invention

[0027] <An Embodiment of the Present Invention> Hereinafter, an embodiment of a cantilever-type induction heating roller device 100 according to the present invention will be described with reference to the drawings.

[0028] This cantilever-type induction heating roller device 100 is used, for example, in a heat treatment process of a continuous material such as a sheet material or web material such as a plastic film, paper, cloth, non-woven fabric, synthetic fiber, metal foil, or a wire (thread) material.

[0029] As shown in Figure 1, the cantilevered induction heating roller device 100 of this embodiment includes a fixed shaft 2 cantilevered to a machine base 20, a cylindrical roller body 5 rotatably supported on the fixed shaft 2 via bearings 3 and 4, an induction heating mechanism 6 provided inside the roller body 5 to induce heating of the roller body 5, and an axial gap motor 7 provided between the machine base 20 and the roller body 5 to rotate the roller body 5 relative to the fixed shaft 2.

[0030] <Fixed axis 2> The fixed shaft 2 is cantilevered by having one end fixed to the fixed machine base 20. This fixed shaft 2 has a roughly cylindrical support shaft portion 21 that rotatably supports the roller body 5 via bearings 3 and 4, and a fixed flange portion 22 formed at the base end of the support shaft portion 21 and fixed to the machine base 20.

[0031] Bearings 3 and 4 are rolling bearings, and the material can be appropriately selected according to the temperature of the bearing section, such as chromium bearing steel, stainless steel, or ceramics. The lubricant can also be appropriately selected from heat-resistant grease, heat-resistant oil, solid lubricant, etc., according to the temperature of the bearing section. In addition to rolling bearings, non-contact magnetic bearings may be used as alternatives.

[0032] <Roller body 5> The roller body 5 has a cylindrical portion 51, a first disc portion 52 provided to close the axial opening at one end of the cylindrical portion 51, and a second disc portion 53 provided to close the axial opening at the other end of the cylindrical portion 51. Multiple jacket chambers 5x are formed along the axial direction within the thickness of the cylindrical portion 51. A gas-liquid two-phase heat transfer medium is sealed in these jacket chambers 5x.

[0033] The first disc portion 52 and the second disc portion 53 of the roller body 5 have through holes 52h and 53h through which the fixed shaft 2 is inserted. An outer ring rotating rolling bearing 3 is provided between the through hole 52h of the first disc portion 52 and the fixed shaft 2, and an outer ring rotating rolling bearing 4 is provided between the through hole 53h of the second disc portion 53 and the fixed shaft 2. One of the first disc portion 52 and the second disc portion 53 may be integrally formed with the cylindrical portion 51.

[0034] In addition, a temperature sensor 8 is provided within the wall thickness of the cylindrical portion 51 of the roller body 5 to detect the temperature of the cylindrical portion 51. This temperature sensor 8 is connected to a detection signal transmission unit 9 provided on the roller body 5, and the detection signal from the temperature sensor 8 is transmitted by the detection signal transmission unit 9 to an external temperature control device (not shown).

[0035] This temperature control device controls the power supply circuit (not shown), which will be described later, to control the temperature of the roller body 5. The detection signal transmission unit 9 may be, for example, a short-range wireless communication system, or it may be an electromagnetic induction type or optical type having a transmitter 9a and a receiver 9b. In the detection signal transmission unit 9 of Figure 1, the transmitter 9a is provided on the second disc portion 53, and the receiver 9b is provided on the fixed flange portion 22.

[0036] <Induction heating mechanism 6> The induction heating mechanism 6 is located inside the roller body 5 and comprises a cylindrical core 61 and an induction coil 62 wound around the outer circumferential surface of the cylindrical core 61. A fixed shaft 2 is inserted through the cylindrical core 61 of the induction heating mechanism 6, and the induction heating mechanism 6 is attached and fixed to the fixed shaft 2 by a mounting member 10.

[0037] Furthermore, a power supply circuit (not shown) for applying an AC voltage of commercial frequency (50Hz or 60Hz) is connected to the lead wire (not shown) connected to the induction coil 62.

[0038] This induction heating mechanism 6 generates an alternating magnetic flux when an AC voltage is applied to the induction coil 62, and this alternating magnetic flux passes through the side circumferential wall (cylindrical portion 51) of the roller body 5. This passage generates an induced current in the cylindrical portion 51 of the roller body 5, and this induced current causes the cylindrical portion 51 of the roller body 5 to generate Joule heat.

[0039] <Axial Gap Motor 7> The axial gap motor 7 rotates the roller body 5 relative to the fixed shaft 2 and is located outside the roller body 5 on the machine base 20 side.

[0040] Specifically, the axial gap motor 7 has a disc-shaped rotor 71 fixed to the roller body 5 and a disc-shaped stator 72 fixed to the fixed flange portion 22 of the fixed shaft 2.

[0041] The rotor 71 has a plurality of permanent magnets arranged at equal intervals around the rotation axis of the roller body 5. In this embodiment, the rotor 71 is fixed to the machine base side end face 5a of the roller body 5 in the direction of the rotation axis. In this embodiment, the machine base side end face 5a is formed by the outer end face of the second disc portion 53 of the roller body 5.

[0042] Here, a thermal insulation layer S1 is formed between the machine-base side end face 5a of the roller body 5 and the back surface of the rotor 71 (the surface opposite to the machine base 20), extending over the entire circumferential direction around the rotation axis. Specifically, the rotor 71 is fixed to the machine-base side end face 5a by an annular fixing member 11, and the thermal insulation layer S1 is formed by this fixing member 11. Specifically, the fixing member 11 has a groove 11a that opens around the entire circumference of its outer circumferential surface. This groove 11a is formed inward from the halfway point of the rotor 71 in the radial direction of the fixing member 11. With this configuration, the fixing member 11 has a roughly U-shaped cross-section. The thermal insulation layer S1 is formed by the groove 11a. In addition, the thickened portion of the fixing member 11 itself also functions as a thermal insulation layer.

[0043] The stator 72 has multiple magnetic poles that face the rotor 71 in the rotation axis direction of the roller body 5. These multiple magnetic poles, like the multiple permanent magnets, are arranged at equal intervals around the rotation axis of the roller body 5. In this embodiment, the stator 72 is provided on the opposing surface 2a that faces the machine base side end face 5a of the roller body 5. This opposing surface 2x is formed by the surface of the fixed flange portion 22 of the fixed shaft 2 that faces the machine base side end face 5a.

[0044] In this axial gap motor 7, by supplying AC power to the stator 72, rotational torque is generated between the rotor 71 and the stator 72, causing the roller body 5 to rotate at a predetermined rotational speed.

[0045] <Cooling mechanism 12 for bearings 3, 4 and axial gap motor 7> Furthermore, the cantilevered induction heating roller device 100 of this embodiment is equipped with a cooling mechanism 12 for cooling the bearings 3 and 4 and the axial gap motor 7.

[0046] The cooling mechanism 12 includes a refrigerant flow path 121 formed inside the fixed shaft 2 through which the refrigerant flows, and a refrigerant supply source (not shown), such as a pump, that supplies the refrigerant to the refrigerant flow path 121. For example, water or air can be used as the refrigerant.

[0047] The refrigerant passage 121 is formed to cool the bearings 3 and 4, as well as the stator 72 of the axial gap motor 7. Specifically, the refrigerant passage 121 is formed inside the support shaft portion 21 and includes a bearing cooling passage 121a for cooling the bearings 3 and 4, and a stator cooling passage 121b formed inside the fixed flange portion 22 for cooling the stator 72.

[0048] The bearing cooling channel 121a communicates with the inlet port P1 and outlet port P2 provided at the base end of the fixed shaft 2, and is a reciprocating path formed axially inside the support shaft portion 21. This bearing cooling channel 121a extends in the axial direction of the support shaft portion 21 to the bearing 3 on the free end side or to its vicinity.

[0049] The stator cooling channel 121b has an annular channel formed inside the fixed flange portion 22 in the portion facing the stator 72, along the circumferential direction of the stator 72. In this embodiment, the stator cooling channel 121b is formed by branching off from the bearing cooling channel 121a and is in communication with the inlet port P1 and the outlet port P2. The stator cooling channel 121b may be formed inside the fixed shaft 2 independently of the bearing cooling channel 121a.

[0050] <Effects of this embodiment> With the induction heating roller device 100 configured in this way, since it does not use a rotating shaft, it is not restricted by a critical speed, and it becomes easy to increase the rotation speed of the roller body 5. Furthermore, since an axial gap motor 7 is used, the cantilevered induction heating roller device 100 can be made smaller compared to conventional devices using radial gap motors, and the area required for installation can be greatly reduced, resulting in space savings. In addition, the rotor 71 and stator 72 of the axial gap motor 7 can be made to the same size as the outer diameter of the roller body 5, and the motor torque and capacity required for the cantilevered induction heating roller device 100 can be obtained. Moreover, since the axial gap motor 7 is provided outside the roller body 5, the axial dimensions of the induction heating mechanism 6 provided inside the roller body 5 can be made as large as possible.

[0051] A groove 11a is formed in the fixing member 11 for fixing the rotor 71, and the groove 11a forms an insulating layer S1, thereby reducing heat transfer from the induction-heated roller body 5 to the rotor 71 and preventing the rotor 71 from overheating. In addition, the back side of the rotor 71 can be actively air-cooled.

[0052] <Other Embodiments> The present invention is not limited to the embodiments described above, and may also be in the following embodiments.

[0053] For example, in addition to the configuration in which the stator 72 of the axial gap motor 7 of the above embodiment is provided on the fixed flange portion 22 of the fixed shaft 2, the stator 72 may also be provided on the machine base 20 or on a separate member (not shown) that is not the fixed shaft 2 provided on the machine base 20, as shown in Figure 2.

[0054] Alternatively, the cooling mechanism 12 may be configured to directly supply a refrigerant containing lubricating oil to the bearings 3 and 4 and the axial gap motor 7. In this case, as shown in Figure 3, the refrigerant flow path 121 carries the refrigerant containing lubricating oil and opens to the outer circumferential surface of the fixed shaft 2 (support shaft portion 21), with a configuration that allows a mist-like refrigerant to be discharged from the opening 121x. Here, the opening 121x of the refrigerant flow path 121 can be shaped like a nozzle to discharge a mist-like refrigerant. The opening 121x is also formed to face the bearings 3 and 4. The mist-like refrigerant discharged from the opening 121x of the refrigerant flow path 121 is sprayed onto the bearings 3 and 4. The mist-like refrigerant sprayed onto the bearing 4 on the machine base side passes between the rotor 71 and stator 72 of the axial gap motor 7, cooling them, and then is released to the outside.

[0055] Furthermore, as shown in Figure 4, a refrigerant passage 121 is formed inside the fixed shaft 2, and the refrigerant passage 121 may be configured to open on the outer circumferential surface of the fixed shaft 2 toward the machine base side rather than the bearing 4, and to supply refrigerant (e.g., air) to the axial gap motor 7. Here, the fixing member 11 that fixes the rotor 71 to the roller body 5 becomes the heat insulating layer S1, and an internal passage 11R is formed inside the fixing member 11 through which the refrigerant flows from the radially inner side toward the radially outer side. The refrigerant passage 121 also opens radially opposite the inner circumferential surface of the fixing member 11 on the outer circumferential surface of the fixed shaft 2. With this configuration, the refrigerant supplied from the refrigerant passage 121 cools the bearing 4 on the machine base side, and then passes through the internal passage 11R due to the centrifugal force accompanying rotation along with the supply pressure of the refrigerant. This cools the rotor 71. In addition, some of the refrigerant passes between the rotor 71 and the stator 72 to cool them, and is then released to the outside.

[0056] Here, Figure 5 shows an example configuration of a fixed member 11 having an internal flow path 11R. Configuration example 1, as shown in Figure 5(a), is composed of a single annular plate member, and an internal flow path 11R is formed within the thickness of the plate member, extending from the radially inner side to the radially outer side. The internal flow path 11R may be a straight flow path or a curved flow path. Configuration example 2, as shown in Figure 5(b), is composed of two annular plate members 11a and 11b overlapping with a plurality of spacer members 11c, and an internal flow path 11R is formed between the plate members 11a and 11b by the plurality of spacer members 11c. In this configuration, the rotor 71 is fixed to one plate member 11a, and the other plate member 11b is fixed to the roller body 2.

[0057] Furthermore, as shown in Figure 6, the fixing member 11 that fixes the rotor 71 to the roller body 5 may have a groove 11a that opens around the entire circumference of its inner circumferential surface. This groove 11a forms a heat insulating layer S1. A refrigerant flow path 121 is formed inside the fixed shaft 2, and the refrigerant flow path 121 may open on the outer circumferential surface of the fixed shaft 2 towards the machine base side than the bearing 4, supplying refrigerant (e.g., air) to the axial gap motor 7. Here, one or more through holes 11h are formed in the bottom wall portion (outer circumferential wall portion) of the groove 11a of the fixing member 11. These groove 11a and through holes 11h constitute an internal flow path 11R. The refrigerant flow path 121 also opens radially opposite the groove 11a of the fixing member 11 on the outer circumferential surface of the fixed shaft 2. With this configuration, the refrigerant supplied from the refrigerant flow path 121 cools the bearing 4 on the machine base side, and then flows into the groove 11a due to the centrifugal force accompanying rotation along with the refrigerant supply pressure, and is discharged to the outside through the through hole 11h. This cools the rotor 71. In addition, some of the refrigerant passes between the rotor 71 and the stator 72 to cool them, and is then discharged to the outside.

[0058] Furthermore, as shown in Figure 7, a configuration may be provided in the rotor 71 in which a flow path 71R is formed between adjacent permanent magnets 11m, through which the refrigerant flows from the radially inner side to the radially outer side. Here, the rotor 71 has an annular magnetic base member 711 and permanent magnets 71m intermittently arranged on the base member 711 in an alternating N-S configuration. The base member 711 may also function as a heat insulating layer S1. A fixing member 11 may also be provided between the base member 711 and the roller body 5. A refrigerant flow path 121 is formed inside the fixed shaft 2 through which the refrigerant flows, and the refrigerant flow path 121 may open on the outer circumferential surface of the fixed shaft 2 toward the machine base side than the bearing 4, supplying the refrigerant (e.g., air) to the axial gap motor 7. Here, the refrigerant flow path 121 opens on the outer circumferential surface of the fixed shaft 2 radially opposite to the permanent magnets 71m. With this configuration, the refrigerant supplied from the refrigerant flow path 121 cools the bearing 4 on the machine base side, and then passes through the flow path 71R between the permanent magnets 71m due to the refrigerant supply pressure and centrifugal force accompanying rotation. The refrigerant also passes between the rotor 71 and the stator 72. This cools the rotor 71.

[0059] In each of the embodiments described above, a magnetic shield may be provided between the axial gap motor 7 and the induction heating mechanism 6. In Figures 1 and 2, this magnetic shield may be provided by the second disc portion 53 or the fixing member 11, or it may be constructed by providing a separate magnetic shield member. With this configuration, mutual magnetic interference between the axial gap motor 7 and the induction heating mechanism 6, which are arranged in series, can be prevented. In addition, to prevent leakage magnetic flux from the core, it is also conceivable to use an involute core (a core made by stacking magnetic steel plates with a roughly involute cross-section in a cylindrical shape) which has low magnetic resistance.

[0060] When performing a straight stretching process using multiple induction heating roller devices as described above, a rotatable part may be provided on the fixed shaft 2 in order to provide a mutual inclination angle (Nelson angle) that allows the multiple induction heating roller devices to stably travel along a predetermined thread path.

[0061] Furthermore, it goes without saying that the present invention is not limited to the embodiments described above, and various modifications are possible without departing from its spirit. [Explanation of Symbols]

[0062] 100... Cantilevered induction heating roller device 20...machine 2...Fixed axis 21...Support shaft part 22. Fixed flange section 3, 4... bearings 5. Roller body 5x...Machine side end surface 6. Induction heating mechanism 7. Axial gap motor 71... Rotor 72...Stator 11. Fixing components 11a...concave groove S1...Insulation layer 121... Refrigerant flow path 121a... Flow channel for bearing cooling 121b...Stator cooling channel 11R...Internal channel 71R...flow path

Claims

1. A fixed shaft cantilevered to the machine base, A cylindrical roller body is rotatably supported on the aforementioned fixed shaft via a bearing, An induction heating mechanism is provided inside the roller body to induce heat generation in the roller body, A cantilever induction heating roller device comprising an axial gap motor provided between the machine base and the roller body, which rotates the roller body relative to the fixed shaft.

2. The aforementioned axial gap motor is A disc-shaped rotor is provided on the machine-mount side end face of the roller body facing the machine-mount side, and has a plurality of permanent magnets arranged around the rotation axis of the roller body, The cantilever induction heating roller device according to claim 1, further comprising a disc-shaped stator provided on the machine base or the fixed shaft opposite to the machine base side end face, and having a plurality of magnetic poles facing the rotor in the rotation axis direction of the roller body.

3. The cantilevered induction heating roller device according to claim 1 or 2, wherein a refrigerant flow path is formed inside the fixed shaft through which the refrigerant flows.

4. A refrigerant channel is formed inside the fixed shaft through which the refrigerant flows, The cantilevered induction heating roller device according to claim 2, wherein the refrigerant flow path cools the bearing and the stator.

5. The aforementioned fixed shaft is The support shaft portion that supports the roller body, It has a fixing flange portion formed at the base end of the support shaft portion and fixed to the machine base, The cantilevered induction heating roller device according to claim 2, wherein the stator is provided on the fixed flange portion.

6. A bearing cooling channel for cooling the bearing is formed inside the support shaft portion. The cantilever induction heating roller device according to claim 5, wherein a stator cooling channel for cooling the stator is formed inside the fixed flange portion.

7. The cantilevered induction heating roller device according to claim 4, wherein the refrigerant passage is for flowing a refrigerant containing lubricating oil, opens to the outer circumferential surface of the fixed shaft, and supplies a mist-like refrigerant to the bearing and the axial gap motor.

8. The cantilevered induction heating roller device according to claim 2, wherein a heat insulating layer is formed between the machine base side end face of the roller body and the rotor.

9. The rotor is fixed to the machine base side end face by an annular fixing member. The cantilevered induction heating roller device according to claim 8, wherein the heat insulating layer is formed by the fixing member.

10. The aforementioned fixing member has a groove formed that opens around the entire circumference of its outer circumferential surface. The cantilevered induction heating roller device according to claim 9, wherein the heat insulating layer is formed by the grooves.

11. A refrigerant flow path is formed inside the aforementioned fixed shaft, The refrigerant passage opens to the outer circumferential surface of the fixed shaft and supplies the refrigerant to the axial gap motor. The cantilever induction heating roller device according to claim 9 or 10, wherein an internal flow path is formed inside the fixing member through which the refrigerant flows from the radially inner side to the radially outer side.

12. A refrigerant flow path is formed inside the aforementioned fixed shaft, The refrigerant passage opens to the outer circumferential surface of the fixed shaft and supplies the refrigerant to the axial gap motor. The cantilever induction heating roller device according to claim 9 or 10, wherein a flow path is formed between adjacent permanent magnets in the rotor, through which the refrigerant flows from the radially inward to the radially outward direction.

Images