Induction heating roller device

Abstract

Induction heating roller device (100), comprising: a rotatably mounted roller body (2); an induction heating mechanism (3) for inductively heating the roller body (2), wherein the induction heating mechanism (3) is arranged within the roller body (2); and a cooling mechanism (8) having an atomizing device (81) for generating an atomized coolant, wherein the cooling mechanism (8) introduces the atomized coolant from one axial end into a substantially cylindrical space (X) formed between the roller body (2) and the induction heating mechanism (3), and guides the coolant out of the roller body (2) from one axial end of the space (X), wherein the atomizing device (81) is detachably provided on a bearing shaft (6A) provided at one end of the induction heating mechanism (3); and an ejection opening (81s) of the atomizing device (81) is mounted so as to be positioned on the center axis of a cavity (61) formed along the center axis within the bearing axis (6A).

Description

FIELD OF THE INVENTION

[0001] The present invention relates to an induction heating roller device, and more particularly, to an induction heating roller device having excellent cooling properties. TECHNICAL BACKGROUND

[0002] Conventionally, in a continuous heating process for heating continuous material such as webs of plastic film, paper, cloth, felt, synthetic fibers, metal foil and the like, woven fabrics or fibers, etc., an induction heating roller device is used in which an induction heating mechanism is arranged inside a rotating roller body, and the circumferential or cylindrical wall of the roller body is heated with induction current.

[0003] In recent years, the need has emerged to shorten the time required for changing the heating temperature with the roller body when changing the continuous material. Furthermore, for safety and hygiene reasons, after a stretching process is completed, the operator cannot leave the station until the temperature of the roller body has dropped below a certain level. Therefore, it is necessary to cool the roller body in as short a time as possible.

[0004] Furthermore, induction heating roller devices are not only used for heating continuous material, but sometimes also for cooling it, so it is necessary to provide the induction heating roller devices with a cooling function.

[0005] In order to provide an induction heating roller device with a cooling function, JP 2000 - 353588 A proposes to cool a roller body by providing a plurality of coolant channels in a circumferential wall of the roller body along the direction of the center axis, equidistant with respect to the circumferential direction, and circulating the coolant within these coolant channels.

[0006] However, in order to circulate the coolant through the coolant passages, it is necessary to supply the coolant from the outside via the roller body or an axle portion (axle flange) integrally provided at its end. And since the roller body and this axle flange are rotating bodies, a rotating sealing mechanism, such as a rotary joint or a mechanical seal, is necessary. However, since these are all contact sealing mechanisms, they cannot avoid the problem of coolant leakage when the seal becomes worn or its thermal or chemical deterioration progresses. To avoid these problems, the rotating sealing mechanism must be regularly maintained or replaced. Of course, such maintenance or replacement requires the induction heating roller device to be stopped, and this maintenance or replacement incurs costs.

[0007] On the other hand, as shown in JP 2003-269442 A, a coolant supply mechanism for supplying coolant into the interior of the roller body and a coolant dispersion mechanism for dispersing the coolant supplied from the coolant supply mechanism in droplet form onto the inner wall of the roller body are conceivable as an arrangement without a contact sealing mechanism. The roller body is cooled by the latent heat of vaporization (heat of vaporization) when the dispersed coolant evaporates into a gas upon contact with the inner wall of the roller body. The coolant dispersion mechanism includes a discharge passage extending axially from one end of the inner circumferential wall of the roller body to the other, and the coolant is dispersed in droplet form from discharge openings provided in the side wall of the discharge passage.With this arrangement, the coolant supply mechanism and the dispersion mechanism are provided in a part of the induction heating mechanism that is statically held inside the roller body, so that a rotating sealing mechanism is unnecessary, and complications due to coolant leakage or maintenance or replacement can be avoided.

[0008] However, since the coolant is distributed directly onto the inner circumferential wall of the roller body, impurities or unevaporated components contained in the coolant may be deposited on the inner circumferential wall of the roller body.

[0009] Specifically, if the coolant is water, for example, impurities or unevaporated components such as calcium carbonate may deposit on the inner circumferential wall of the roller body. Dissolved chlorine components may cause the roller body to corrode or rust to form at that location. If the coolant is organic oil, for example, the heat may cause cracking, and carbide may deposit on the inner circumferential wall of the roller body. Furthermore, if the coolant contains a chemically corrosive component, the inner circumferential wall of the roller body, where the coolant is distributed, may corrode, and the wall thickness may decrease.

[0010] Furthermore, in this arrangement, since the discharge pipe of the coolant dispersion mechanism disperses the coolant through fine holes, there may be a problem that dust or the like contained in the coolant accumulates in these fine holes and clogs the dispersion mechanism, so that there may be a need to disassemble the induction heating roller device and replace, for example, the discharge pipe.

[0011] Furthermore, the induction heating roller device may be used alternately as a heating roller for heating continuous material and as a cooling roller for cooling continuous material. In this case, if it is to be used as a heating roller after use as a cooling roller, the coolant still in the discharge line of the coolant dispersion mechanism will be heated by conduction from the roller body, and there is a risk of boiling under certain circumstances.

[0012] JP S60-11715 A discloses an induction heating roller device having a rotatably mounted roller body, an induction heating mechanism for inductively heating the roller body, and a cooling mechanism that introduces the coolant from one axial end into a substantially cylindrical space formed between the roller body and the induction heating mechanism.

[0013] DE 198 15 817 A1 discloses a cooling system for cooling heat sources, in particular for cooling electrical components, comprising a cooler which forms at least one first cooling surface to which the cooling medium can flow, and at least one second cooling surface for flanging the heat source, on a housing through which a cooling medium can flow. OVERVIEW OF THE INVENTION TASK TO BE SOLVED BY THE INVENTION

[0014] Therefore, a primary object of the present invention is to solve the above-mentioned problems and to enable cooling of the roller body without providing a rotating sealing mechanism on the roller body and while suppressing corrosion of the roller body. MEANS FOR SOLVING THE TASK

[0015] An induction heating roller apparatus according to one aspect of the present invention comprises the features of claim 1.

[0016] With this arrangement, atomized coolant is introduced into the roller body, allowing the roller body or the induction heating mechanism to be cooled using the latent heat of vaporization generated when the atomized coolant evaporates when it contacts the inner circumferential wall of the roller body, as well as the inherent heat generated when the temperature of the atomized coolant rises in the gap, and the latent heat generated during vaporization. By introducing the atomized coolant from one axial end of the gap and expelling the coolant from one axial end of the gap to the outside of the roller body, the entire gap can be permeated by the atomized coolant.Since the coolant supply and discharge are located at one axial end of the gap, the structure within the roller body can be simplified, and the influence of the arrangement of structural components within the roller body on the temperature of the roller body can be neglected. Furthermore, since atomized coolant is used, the amount of coolant that comes into contact with the roller body can be reduced, and corrosion of the inner wall of the roller body and deposition of impurities, etc., can be avoided.

[0017] In order to simplify the structure of the roller body and to prevent the induction heating roller device from becoming too large, it is advantageous for the cooling mechanism to have a coolant supply channel formed inside a bearing shaft extending from both ends of the induction heating mechanism and guiding the atomized coolant coming from the atomizing device, an opening located downstream in this coolant supply channel being arranged at the axial end of the gap.

[0018] In order to supply the atomized coolant evenly into the gap and to cool the roller body or the induction heating mechanism efficiently, it is advantageous if several of the openings located downstream in the coolant supply channel are provided in the radial direction in the bearing axis.

[0019] In order to simplify the structure of the roller body and to prevent the induction heating roller device from becoming too large, it is advantageous for the cooling mechanism to have a coolant discharge passage for discharging the coolant that has passed through the gap to the outside, wherein the coolant discharge passage is formed inside a bearing shaft extending from both ends of the induction heating mechanism, and wherein an opening upstream of this coolant discharge passage is arranged at the axial end of the gap.

[0020] In order to facilitate the discharge of the coolant from the gap formed between the roller body and the induction heating mechanism to the coolant discharge channel, to promote the gasification of atomized coolant in the gap, and to prevent condensation on the inner circumferential wall of the roller body and the induction heating mechanism forming the gap, it is advantageous if a pressure relief device for depressurizing the gap is provided in a coolant discharge pipe connected to the coolant discharge channel.

[0021] In order to facilitate the removal and replacement of the atomizing device, for example in the event of problems with the atomizing device, it is advantageous if the atomizing device is provided detachably outside the roller body.

[0022] In order to prevent rust from forming in the roller body due to the atomized coolant and / or the insulation of the induction heating mechanism from deteriorating in the roller body when the cooling of the roller body and / or the induction heating mechanism is stopped in the induction heating roller device with cooling of the roller body and / or the induction heating mechanism using atomized coolant, it is advantageous for the induction heating roller device to further comprise a gas supply mechanism that supplies gas into the interior of the gap after stopping the supply of atomized coolant and discharges the coolant inside the gap to the outside.

[0023] Thus, after stopping the supply of atomized coolant, gas is supplied into the gap, and the coolant remaining in the gap is discharged to the outside, preventing the atomized coolant from condensing and depositing on the roller body, thus forming rust. Furthermore, insulation deterioration or short circuits due to the deposition of condensed coolant on the induction heating mechanism can be prevented. Furthermore, by supplying gas into the gap, the evaporation of coolant already condensed in the gap can be accelerated, thus preventing the formation of rust inside the roller body and the deterioration of the insulation of the induction heating mechanism.

[0024] In order to efficiently discharge the atomized refrigerant remaining in the gap after the supply of atomized refrigerant is stopped to the outside before it condenses, it is advantageous for the gas supply mechanism to supply gas into the gap for a certain period of time immediately after the supply of atomized refrigerant is stopped. Furthermore, the gas supply does not necessarily have to be performed immediately after the supply of atomized refrigerant is stopped; the gas supply may also be performed after a predetermined period of time has elapsed after the supply of atomized refrigerant is stopped.

[0025] By supplying gas after the supply of atomized coolant is stopped, the atomized coolant in the gap is reduced, and it is not necessary to supply a large amount of gas. On the other hand, even if it is no longer necessary to discharge the atomized coolant to the outside, it may be necessary to evaporate the coolant and prevent recondensation. From this perspective, it is advantageous for the gas supply mechanism to adjust the amount of gas supplied to the gap depending on the time elapsed after the supply of atomized coolant is stopped.

[0026] In order to provide the coolant mechanism and the gas supply mechanism with common elements and thus simplify the structure of the induction heating roller device, it is advantageous if the cooling mechanism comprises an atomizing device for generating atomized coolant, a compressed air supply circuit for supplying compressed air to the atomizing device, and a coolant supply circuit for supplying coolant to the atomizing device, wherein the gas supply mechanism is configured using the compressed air supply circuit, and after the coolant supply circuit is closed, compressed air from the compressed air supply circuit is supplied to the gap via the atomizing device.

[0027] In order to remove the remaining atomized coolant and the condensed coolant a certain time immediately after stopping the supply of atomized coolant, and to prevent internal condensation and to remove condensed coolant after this certain time has elapsed, it is advantageous if the compressed air supply circuit branches between a compressed air source and the atomizing device and has a first branch with a high-pressure pressure relief valve for supplying high-pressure air for generating the atomized coolant to the atomizing device, a second branch with a low-pressure pressure relief valve for supplying low-pressure air to the atomizing device, and a switching mechanism for switching between the first branch and the second branch,The gas supply mechanism supplies high pressure using the first branch with the switching mechanism for a specific time immediately after stopping the supply of atomized coolant to the gap, and after this specific time, supplies low pressure using the second branch with the switching mechanism. Thus, by a simple arrangement and control that switches between the first branch and the second branch, the gas flow rate supplied to the gap can be changed.

[0028] In order to more surely prevent condensation inside the roller body in an operating state in which atomized coolant is not supplied, an arrangement is advantageous in which low-pressure air is continuously supplied except at the times when atomized coolant is supplied to the gap and high-pressure air is supplied after the supply of the atomized coolant.

[0029] In order to prevent the roller body from being locally overcooled by the atomized coolant when supplying atomized coolant into the gap formed by the roller body and the induction heating mechanism, it is advantageous if the cooling mechanism has a coolant supply channel formed inside a bearing shaft extending from both ends of the induction heating mechanism, wherein a downstream opening of the coolant supply channel opens into the outer circumferential wall of the bearing shaft, and the coolant supply channel introduces the atomized coolant from the atomizing device in the radial direction at the axial end of the gap, and the induction heating roller device further has a guide part provided at one axial end of the gap and which guides the atomized coolant flowing from the downstream opening in the radial direction,downstream in the axial direction of the gap.,

[0030] Thus, since the coolant flowing in the radial direction from the downstream openings in the coolant supply channel is deflected by the guide member in the axial direction of the gap, droplet formation due to collisions of the atomized coolant with the inner wall at the axial end of the roller body can be reduced. This prevents the axial end of the roller body from being locally overcooled relative to the downstream openings. Furthermore, the flow of the atomized coolant can be efficiently deflected from the radial direction to the axial direction with the guide member, and the atomized coolant can more easily pass through the entire gap.

[0031] Since the atomized coolant impinges on the guide member, it is conceivable that this guide member is excessively cooled compared to other components. To minimize the influence of heat from the excessively cooled guide member on the roller body, it is advantageous to provide the guide member with a heat-insulating layer on the inner circumferential wall of the roller body.

[0032] In order to minimize the influence of heat from the guide member to the roller body with a simple arrangement, it is advantageous if the guide member is fixed to the inner wall of the axle flange provided at both ends of the roller body and is provided at a distance from the inner circumferential wall of the roller body.

[0033] In order to thermally decouple the guide part and the component to which the guide part is fastened, and to reduce the influence of heat from the guide part, it is further advantageous if the guide part is fastened to the component with a heat-insulating fastening element which forms the axial end of the intermediate space.

[0034] Since the roller body rotates relative to the induction heating mechanism, the roller body also rotates relative to the downstream openings in the coolant supply channel, which are provided in the bearing axis of the induction heating mechanism. With this arrangement, it is advantageous if the guide member is provided over the entire circumference of the axial end of the gap to efficiently guide the atomized coolant flowing radially from the downstream openings downstream in the gap.

[0035] Furthermore, according to a further aspect, an induction heating roller device according to the invention may have the features of claim 9. EFFECT OF THE INVENTION

[0036] With the above-mentioned invention, a roller body is cooled by supplying atomized coolant to a substantially cylindrical space formed between the roller body and an induction heating mechanism, so that cooling of the roller body is enabled while suppressing corrosion of the roller body without having to provide a rotating sealing mechanism on the roller body. SHORT DESCRIPTION OF THE CHARACTERS Fig. 1 is a sectional view of an induction heating roller device according to a first embodiment of the invention. Fig. 2 is a sectional view of an induction heating roller device according to a modified embodiment. Fig. 3 is a sectional view of an induction heating roller device according to a modified embodiment. Fig. 4 is a sectional view of an induction heating roller device according to another modified embodiment. Fig. 5 is a sectional view of an induction heating roller device according to another modified embodiment. Fig. 6 is a sectional view taken along AA in an induction heating roller device according to another modified embodiment. Fig. 7 is a sectional view of a cantilever induction heating roller device according to another modified embodiment. Fig. 8 is a sectional view of an induction heating roller device according to a second embodiment of the invention. Fig. Fig. 9 is a schematic view of the arrangement of the supply circuits in this embodiment. Fig. 10 is a schematic view of the control circuit of a temperature controller in this embodiment. Fig. 11 is a diagram showing the control flow of the temperature control in this embodiment. Fig. 12 is a sectional view of an induction heating roller device according to a third embodiment of the invention. Fig. 13 is an enlarged view mainly showing the coolant supply passage and the guide member in this embodiment. Fig. 14 is a sectional view taken along AA in this embodiment. Fig. 15 is an enlarged sectional view of the guide part in a modified embodiment. Fig. 16 is a partially enlarged sectional view of the guide member in another modified embodiment. LIST OF REFERENCE SYMBOLS 100 induction heating roller device 2 roller bodies 3 Induction heating device X space 6 bearing axis 8 Cooling mechanism 81 atomization device 84 Coolant supply channel 85 Coolant drainage channel 9 Pressure relief device EMBODIMENTS OF THE INVENTIONFirst Embodiment

[0037] In the following, a first embodiment of an induction heating roller device according to the invention will be explained with reference to the accompanying figures.

[0038] An induction heating roller device 100 according to this embodiment can be used in a continuous heating process to heat continuous material such as webs of plastic film, paper, cloth, felt, synthetic fibers, metal foil and the like, woven fabrics or fibers, etc.

[0039] More specifically, the induction heating roller device 100 as shown in Fig. 1, a rotatably mounted, hollow cylindrical roller body 2, and an induction heating mechanism 3 which is arranged within the roller body 2.

[0040] At each end of the roller body 2, an axle flange 41 is attached by means of a sealing element S1, such as an O-ring. This sealing element S1 prevents the atomized coolant described below from leaking out. Each axle flange 41 is formed integrally with a hollow drive shaft 42, and these drive shafts 42 are rotatably supported on a housing 52 (or stand or frame) by bearings 51, such as ball bearings. The roller body 2 is configured to be rotated by the driving force supplied thereto from the outside by a rotation drive mechanism (not shown), such as a motor or the like.

[0041] The induction heating mechanism 3 comprises a circular cylindrical iron core 31 forming a circular cylinder, and an induction coil 32 wound around the outer circumferential or cylindrical surface of the cylindrical iron core 31. A bearing shaft 6 is attached to each of the two ends of the cylindrical iron core 31. These bearing shafts 6 are each inserted inside the drive shafts 42 and rotatably supported on the respective drive shaft 42 via a bearing 7, such as a ball bearing. This keeps the induction heating mechanism 3 inside the rotating roller body 2 in a state of rest or standstill with respect to the roller body 2. The induction coil 32 is connected to a lead line L2, which in turn is connected to an AC power source V for applying an AC voltage. It should be noted that a sealing mechanism S2, e.g., a seal mechanism S2, is provided between the outer surface of the bearing shaft 6 and the inner surface of the drive shaft 42.B. an oil seal or a labyrinth seal, is provided so that the atomized coolant cannot leak out.

[0042] By this induction heating mechanism 3, an alternating magnetic flux is generated when an alternating voltage is applied to the induction coil 32, and this alternating magnetic flux flows through the circumferential side wall 21 of the roller body 2. By this flux, a current is induced in the roller body 2, and this induced current in turn generates Joule heat in the roller body 2.

[0043] The induction heating roller device 100 according to this embodiment further includes a cooling mechanism 8 for cooling the roller body 2 and the induction heating mechanism 3.

[0044] As in Fig. 1, this cooling mechanism 8 cools the roller body 2 and the induction heating mechanism 3 by introducing an atomized coolant from one end in the axial direction of a substantially cylindrical gap X between the roller body 2 and the induction heating mechanism 3, and discharging or leading the coolant out of the roller body 2 from the other end in the axial direction of the gap X. The axial direction is the horizontal direction in the paper plane, as shown in Fig. 1 indicated by the arrows.

[0045] More specifically, the cooling mechanism 8 includes an atomizing device 81 for generating atomized coolant, a compressed air supply circuit 82 for supplying compressed air to the atomizing device 81, a coolant supply circuit 83 for supplying water as a coolant to the atomizing device 81, a coolant supply channel 84 for supplying atomized coolant from the atomizing device 81 from one axial end of the gap X, and a coolant discharge channel 85 for discharging or discharging the coolant passed through the gap X to the outside from the other axial end.

[0046] The gap X is airtight and consists mainly of a substantially cylindrical gap X1 formed by the inner circumferential wall of the roller body 2 and the outer circumferential wall of the induction heating mechanism 3, and substantially annular gaps X2 each formed by the inner wall of the axle flange 41 provided at the respective end of the roller body 2 and the axial end wall of the induction heating mechanism 3.

[0047] The atomizing device 81 produces atomized (spray-like) coolant by mixing compressed air from the compressed air supply circuit 82 and water from the coolant supply circuit 83. Immediately after atomization, the atomized coolant has a particle diameter such that it does not evaporate, and the particle diameter is such that it does not fall down due to gravity during air transport or liquefy due to collision with the walls in the bent section of the channel. Specifically, the particle diameter can be in the range of 30 to 100 µm.

[0048] The compressed air supply circuit 82 comprises a compressed air source 821, a compressed air line 822 connected at one end to the compressed air source 821 and at the other end to the atomizing device 81, and an on / off valve or two-point valve 823 provided in the compressed air line 822 and allowing or blocking the supply of compressed air to the atomizing device 81.

[0049] The coolant supply circuit 83 includes a water tank 831, a coolant line 832 connected at one end to the water tank 831 and at the other end to the atomizing device 81, a flow control valve 833 provided in the coolant line 832 for controlling the flow rate of coolant supplied to the atomizing device 81, and an on / off valve 834 provided downstream of the flow control valve 833 and allowing or blocking the supply of coolant to the atomizing device 81.

[0050] A control unit C for controlling the voltage applied to the induction coil 32 receives a sensor signal from a temperature sensor 2T embedded in the circumferential wall of the roller body 2. The temperature signal indicating the wall temperature of the roller body 2 is detected as a current signal by the flow control valve 833 provided in the coolant line 832 via an amplifier A, thereby adjusting the flow rate of the coolant. Thus, an arrangement is created with which the supply amount of atomized coolant can be continuously adjusted depending on the temperature of the circumferential wall of the roller body 2, and the coolant speed and the cooling function of the roller body 2 can be easily adjusted. The sensor signal from the temperature sensor 2T is output to the control unit C via a rotary transformer 10.

[0051] The coolant supply channel 84 includes a cavity 61 formed along the center axis within the support shaft 6 (hereinafter, this support shaft will be referred to as "6A") provided at one end of the induction heating mechanism 3. Specifically, this cavity 61 is a substantially circular columnar space formed coaxially with the center axis of the support shaft 6A.

[0052] The cavity 61 is opened at the outer end surface of the support shaft 6A, and at this opening, an ejection port 81s of the atomizing device 81 is attached, which faces the interior of the cavity 61. Specifically, the ejection port 81s of the atomizing device 81 is positioned on the center axis of the cavity 61. Thus, it is provided in such a position that the atomizing device 81 can be easily detached or removed from the induction heating roller device 100 in the event of clogging or other problems. The opening of the cavity 61 and the atomizing device 81 are detachably connected to each other via a sealing mechanism (not shown in the figures).

[0053] The cavity 61 communicates with the clearance X via a plurality of through holes 61H in the root portion of the bearing shaft 6A (end on the induction heating mechanism 3 side). These through holes 61H form downstream openings of the coolant supply channel 84. The through holes 61H are arranged at one axial end of the clearance X (in the present embodiment, the clearance X2) and are formed radially equidistant in the bearing shaft 6A. With this arrangement, the atomized coolant exiting from the downstream openings (through holes 61H) is introduced radially into the axially upstream end of the clearance X.More specifically, the atomized coolant is introduced along the radial direction into the substantially annular space X2 of the space X formed by the inner wall of the axle flange 41 provided at both ends of the rolling element 2 and the axially upstream end wall 3X of the induction heating mechanism 3.

[0054] The coolant discharge passage 85 includes a coolant discharge pipe 85T formed along the inner side of the bearing shaft 6 located at the other end of the induction heating mechanism 3 (hereinafter, this bearing shaft will be referred to as "6B"). This coolant discharge pipe 85T is inserted into the cavity 62 formed along the central axis inside the bearing shaft 6B and opens into the space X at the base end of the bearing shaft 6B (the end on the induction heating mechanism 3 side), this opening forming an upstream opening of the coolant discharge passage 85. This upstream opening is provided at the other axial end of the space X (referred to as space X2 in the present embodiment). It should be noted that the guide line L2 connected to the induction coil 32 is also arranged within this cavity 62 of the bearing shaft 6B.

[0055] Furthermore, a pressure relief device 9 for reducing the pressure in the gap X is provided in the coolant discharge pipe 85T outside the bearing axis 6B. This pressure relief device 9 reduces the pressure within the gap X by sucking in the air on the upstream side of the coolant discharge pipe 85T and discharging it to the outside. As a result, the pressure in the gap X is reduced, the atomized coolant introduced into the gap X can be evaporated more easily, the roller body 2 can be cooled more easily, and the gasified coolant is less likely to condense on the inner circumferential wall of the roller body 2 or on the induction heating mechanism 3. Furthermore, the pressure relief device 9 is configured such that the atomized coolant flows through the gap X at a predetermined flow rate.More specifically, by setting the flow velocity of the atomized coolant in the gap X to at least 0.3 m / s, high thermal conductivity can be achieved and the cooling efficiency of the roller body can be significantly increased.

[0056] Since atomized coolant is supplied into the gap X as described above, the surfaces forming the gap X, specifically the inner circumferential surface of the roller body 2, the inner surface of the axle flange 41, and the outer circumferential surface of the bearing axle 6, are subjected to a rust-proofing process. To prevent electrical noise due to the coolant, a water-repellent film F is provided on almost the entire outer circumferential surface of the induction heating mechanism 3. This water-repellent film F is necessary if condensation is a concern due to the relationship between the dew point temperature, which depends on the atomization density or mist density within the roller body 2, and the induction heating mechanism 3 during cooling operation.However, if the temperature of the induction heating mechanism 3 is always greater than or equal to the dew point temperature, then the water-repellent film F can be omitted. Effect of the first embodiment

[0057] With the induction heating roller device 100 according to the above-described embodiment, atomized coolant is introduced into the roller body 2, so that the roller body 2 or the induction heating mechanism 3 can be cooled with the latent heat of vaporization when the atomized coolant evaporates when it contacts the inner circumferential wall of the roller body 2, as well as the inherent heat when the temperature of the atomized coolant rises within the roller body 2, and the latent heat of vaporization. By introducing the atomized coolant from one axial end of the gap X formed in a substantially cylindrical shape between the roller body 2 and the induction heating mechanism 3, and by expelling the coolant from one axial end of the gap X to the outside, the entire gap X can be permeated by the atomized coolant.Furthermore, since atomized coolant is used, the amount of coolant that comes into contact with the roller body 2 can be reduced, and corrosion of the inner wall of the roller body 2 and deposition of impurities, etc., can be avoided. It takes about 30 minutes for the roller body 2 of the induction heating roller device to naturally cool from 200°C to 150°C on its own, whereas the time for cooling the roller body 2 from 200°C to 150°C can be reduced to about 10 minutes by using the cooling mechanism 8. Modified examples of the first embodiment

[0058] The present invention is not limited to the first embodiment described above.

[0059] If, in the first embodiment, the cooling mechanism 8 is arranged at one end of the axle flanges 41 and the rotary transformer 10 at the other end, and a rotation drive mechanism is attached to one end of the axle flanges 41, this may complicate the arrangement and make the application difficult. In this case, as shown in Fig. 2, it is preferred that the cooling mechanism 8 is provided at the same end as the rotary transformer 10. The guide line L2 also passes through the cavity 62 in the bearing axis 6B, so that the atomizing device 81 is attached to a pipe 84T that is independent of the bearing axis 6B. Furthermore, the coolant supply channel 84 extends from the bearing axis 6B on the other side through the interior of the induction heating mechanism to the base end of the bearing axis 6A, and with the through holes 61H in the base end of the bearing axis 6A, the openings on the downstream side of the coolant supply channel 84 are arranged at one axial end of the gap X. The atomized coolant introduced into the coolant supply channel 84 is led out to the outside through a coolant discharge channel 85 as in the first embodiment.

[0060] In this first embodiment, a two-sided bearing type induction heating roller device has been described, but it is also possible to apply the invention to an induction heating roller device in which only one of the axle flanges 41 is supported at two points, as shown in Fig. 3. The roller body 2 is supported by two bearings 51a, 51b, which are arranged spaced apart from each other in the axial direction. Furthermore, an arrangement of the cooling mechanism is also conceivable in which the same arrangement as in Fig. 2 is used.

[0061] Furthermore, the cooling mechanism 8, as shown in Fig. 4 and Fig. 5, an atomizing device 81 for generating atomized coolant and a coolant supply pipe 86 for supplying atomized coolant to the gap X, which has a plurality of coolant supply ports 86H connected to the atomizing device 81 and arranged along the axial direction of the substantially cylindrical gap X formed between the roller body 2 and the induction heating mechanism 3.

[0062] In this case, the coolant supply pipe 86 can, for example, as shown in Fig. 4, be connected at one end to the atomizing device 81 and be arranged, for example, along the central axis within the gap X. Furthermore, on the outer circumferential wall of a part of the coolant supply pipe 86 arranged on the circumferential wall of the induction heating mechanism 3, the plurality of coolant supply ports 86H are formed to guide the atomized coolant into the gap X. At this time, the coolant guided from the coolant supply pipe 86 into the gap X is guided out through the coolant discharge channel 85, as in the first embodiment.

[0063] Furthermore, the cylindrical iron core 31, as shown in Fig. 5 and Fig. 6, be provided with a line receiving section 31M, and the coolant supply pipe 86 can be arranged along this line receiving section 31M. In this case, the line receiving section 31M, as shown in Fig. 5, arranged along the axial direction. Furthermore, the coolant supply openings 86H of the coolant supply pipe 86, as shown in Fig. 5, positioned between the induction coils 32 arranged spaced apart from each other on the outer circumferential surface of the cylindrical iron core 31, and the atomized coolant is guided from between the induction coils 32 into the gap X. In this modified embodiment, the coolant discharge channel 85 is formed integrally with the lateral circumferential wall of the bearing shaft 6B, and is connected at the downstream end to the coolant discharge pipe 85T. It should be noted that the Fig. 5 and Fig. 6 only show one coolant supply pipe 86, but it is also possible to provide several.

[0064] As in Fig. As shown in Figure 7, it is also possible for the invention to be applied to an induction heating roller device 100 designed as a so-called cantilever. Elements corresponding to those in the first embodiment are identified by the same reference numerals.

[0065] This induction heating roller device 100 includes a cylindrical roller body 2, a motor M, a bearing housing (frame) 12, an induction heating mechanism 3, and a cooling mechanism 8. The roller body 2 is provided with a bottom and has an axle fitting portion 2a at the center of its bottom. The motor M has a rotating shaft M1 inserted into the hollow interior of the roller body 2, and the front end of the rotating shaft M1 is fitted and bolted into the axle fitting portion 2a of the roller body 2. The bearing housing 12 is fixed at one end to the housing MH of the motor M, and the other end extends into the hollow interior of the roller body 2. The bearing housing 12 supports the rotating shaft M1 with bearings 11a and 11b. The induction heating mechanism 3 is fixed to the bearing housing 12 such that it extends along the inner circumferential surface of the roller body 2 and heats the roller body 2.The cooling mechanism 8 cools the roller body 2 and the induction heating mechanism 3.

[0066] A coolant supply passage 84 of the cooling mechanism 8 is formed inside the bearing housing 12. Specifically, one end of the coolant supply passage 84 is opened in the outer wall (rear end wall) of the bearing housing 12, and the other end is opened in the wall (front end wall) defining the gap X3 (communicating with the gap X formed between the roller body 2 and the induction heating mechanism 3) formed between the roller body 2 and the other end of the bearing housing 12. Furthermore, a discharge port 81s of the atomizing device 81 is detachably secured to one end of the coolant supply passage 84 by a sealing structure (not shown).

[0067] Furthermore, a coolant discharge channel 85 of the cooling mechanism 8 is also formed within the bearing housing 12. Specifically, one end of the coolant discharge channel 85 is opened in the wall defining a gap X4 formed between the induction heating mechanism 3 and the rotating shaft M1, and the other end is opened in the rear end wall of the bearing housing 12. A coolant discharge pipe 85T having a pressure relief device 9 is connected to the opening in the rear end wall of the coolant discharge channel 85. In this modified embodiment, the coolant supply channel 84 and the coolant discharge channel 85 may also be interchanged.

[0068] It should be noted that a flange portion 12F covering the opening of the roller body 2 and a non-contact seal S3, such as a labyrinth seal, are provided on the bearing housing 12 to prevent the atomized coolant from leaking out. Furthermore, a non-contact seal S4, such as a labyrinth seal, is also provided between the rotating shaft M1 and the bearing housing 12, in front of the front bearing 11a, to prevent the atomized coolant from leaking out.

[0069] Furthermore, in the first embodiment, the atomized coolant was supplied to the gap, but an arrangement is also possible in which a conduit is provided within the induction heating mechanism, and the induction heating mechanism is preferably cooled by passing the atomized coolant through this conduit. This can prevent the performance of the iron core or the conduits forming the induction coil from deteriorating.

[0070] Furthermore, in the first embodiment, it was provided that the atomized coolant was introduced from one axial end of the gap and led out from the other axial end, but it is also possible that the atomized coolant is introduced from one axial end of the gap and led out from the same axial end. Second embodiment

[0071] A second embodiment of an induction heating roller device according to the invention will be explained below with reference to the accompanying figures. Elements corresponding to those in the first embodiment are designated by the same reference numerals.

[0072] As in Fig. 8, the induction heating roller device 100 of this embodiment includes, as in the first embodiment, a rotatably supported hollow cylindrical roller body 2, an induction heating mechanism 3 disposed inside the roller body 2, and a cooling mechanism 8 for cooling the roller body 2 and the induction heating mechanism 3 with an atomized coolant.

[0073] The compressed air supply circuit 82 of the present embodiment includes a compressed air source 821, a compressed air line 822 connected at one end to the compressed air source 821 and at the other end to the atomizing device 81, an on / off valve 823 provided in the compressed air line 822 for permitting or blocking the supply of compressed air to the atomizing device 81, and a flow control valve 824 (a pressure relief valve in the present embodiment) provided downstream of the on / off valve 823 for regulating the flow rate of compressed air supplied to the atomizing device 81. The specific arrangement of the compressed air supply circuit 82 and the specific control of the on / off valve 823 with a temperature controller TC will be explained below.

[0074] The coolant supply circuit 83 of this embodiment includes a water tank 831, a coolant line 832 connected at one end to the water tank 831 and at the other end to the atomizing device 81, an on / off valve 834 provided in the coolant line 832 for allowing or blocking the supply of coolant to the atomizing device 81, and a flow control valve 833 (a pressure relief valve in the present embodiment) provided downstream of the on / off valve 834 for adjusting the flow rate of coolant supplied to the atomizing device 81. The on / off valve 834 is an electromagnetic valve that can be opened or closed with an on / off signal from a temperature controller TC. The detailed control with the temperature controller TC will be explained below.

[0075] The induction heating roller device 100 of the present embodiment further includes a gas supply mechanism which, after the supply of atomized coolant to the gap X by the cooling mechanism 8 is stopped, supplies a coolant removing gas to the gap X to force the coolant in the gap X outward.

[0076] The gas supply mechanism is configured using a part of the cooling mechanism 8. Specifically, the gas supply mechanism utilizes the compressed air supply circuit 82 and the coolant supply passage 84. After the coolant supply circuit 83 of the cooling mechanism 8 is closed, compressed air is supplied to the space X from the compressed air supply circuit 82 via the atomizing device 81 and the coolant supply passage 84. At this time, the air supplied to the space X is discharged to the outside via the coolant discharge passage 85.

[0077] In the compressed air supply circuit 82 forming part of the gas supply mechanism, the compressed air line 822 branches off as shown in the Fig. 8 and Fig. 9, between the compressed air source 821 and the atomizing device 81, and comprises a first branch 822A with a high-pressure pressure relief valve 824A for supplying high-pressure air for generating the atomized coolant to the atomizing device 81, a second branch 822B with a low-pressure pressure relief valve 824A for supplying low-pressure air to the atomizing device 81, and a switching mechanism for switching between the first branch 822A and the second branch 822B. The flow rate of low-pressure air supplied from the second branch 822B is set to be lower than the flow rate of high-pressure air supplied from the first branch 822A, and can be set to, for example, 10% thereof.

[0078] The switching mechanism of this embodiment is constituted by a first on / off valve 823A and a second on / off valve 823B, which are provided in the first branch 822A and the second branch 822B, respectively. The first on / off valve 823A and the second on / off valve 823B are electromagnetic valves that can be opened and closed by an ON / OFF signal from the temperature controller TC. It is also possible to provide three-way valves as the switching mechanism at the branching point and confluence point of the first branch 822A and the second branch 822B.

[0079] Next, with reference to the Fig. 10 and Fig. 11 explains the temperature control of the induction heating roller device 100 of the present embodiment, as well as the operation of the cooling mechanism 8 and the gas supply mechanism. Fig. 10 is a control circuit diagram of the compressed air supply circuit 82 and the coolant supply circuit 83 in the temperature controller TC. Fig. 11 is a control flow diagram showing the relationship between the temperature of the roll body 2 on the one hand and the operation of the induction heating mechanism 3 (power of the induction coil), the compressed air supply circuit 82 (ON / OFF of the on / off valves 823A and 823B) and the coolant supply circuit 83 (ON / OFF of the on / off valve 834) on the other hand.

[0080] The temperature controller TC receives a sensor signal from the temperature sensor 2T embedded in the circumferential wall of the roller body 2 via a temperature detection device (more precisely, the rotary transformer) 10, compares the actual temperature (PV) indicated by this sensor signal with a predetermined target temperature (SV), and controls the power supply to the induction coil 32 and the supply of atomized coolant such that the actual temperature (PV) becomes the target temperature (SV). Depending on the difference between the actual temperature (PV) and the target temperature (SV), the temperature controller TC outputs a signal to be input to the induction coil 32 to a power control device 11, which has, for example, a thyristor.

[0081] If the actual temperature (PV) is higher than the target temperature (SV), the temperature controller TC outputs an ON signal to the first on / off valve 823A in the first branch 822A of the compressed air supply circuit 82 and to the on / off valve 834 in the coolant supply circuit 83 to supply atomized coolant to the gap X and cool the roller body 2. Fig. 11 shows an operation in which atomized coolant is supplied to the gap X when the actual temperature (PV) is +1°C higher than the target temperature (SV). Thus, the first on / off valve 823A and the on / off valve 834 are opened, compressed air and coolant are supplied to the atomizing device 81, and atomized coolant is generated.

[0082] Thereafter, when the roller body 2 has been cooled by the atomized coolant and the actual temperature (PV) has dropped below the target temperature (SV), the temperature controller TC outputs an OFF signal to the first on / off valve 823A and the on / off valve 834 to stop the supply of atomized coolant. At this time, the on / off valve 823A in the first branch 822A closes with a predetermined delay time set by a delay timer T1, and until then, only high-pressure air continues to be supplied into the gap X via the atomizing device 81. In other words, the high-pressure air is supplied into the gap X immediately after stopping the supply of atomized refrigerant for a certain period of time, which not only allows the atomized refrigerant remaining in the gap X to be discharged to the outside, but also allows already condensed refrigerant (condensate water) to be evaporated and discharged to the outside.By supplying high-pressure air immediately after stopping, the time in which the remaining atomized coolant condenses can be kept as short as possible.

[0083] At the time the first on / off valve 823A in the first branch 822A closes, the temperature controller TC outputs an ON signal to the second on / off valve 823B in the second branch 822B. This opens the second on / off valve 823B, and only low-pressure air is supplied to the gap X via the first atomizing device 81. Thus, for a certain period of time immediately after the supply of atomized coolant to the gap X is stopped by the switching mechanism, high-pressure air is supplied via the first branch 822A, and after this certain period of time, low-pressure air is supplied via the second branch 822B by the switching mechanism. In other words, depending on the time elapsed after the supply of atomized coolant is stopped, the gas flow rate supplied to the gap X is adjusted in two stages (high-pressure air and low-pressure air).Thus, after this certain time has elapsed, low pressure is supplied so that the condensation of refrigerant can be prevented and condensed refrigerant can be removed.

[0084] Thereafter, until the operation of supplying atomized coolant starts, that is, until the actual temperature (PV) exceeds the set temperature (SV) and the cooling operation starts again, the temperature controller TC outputs an ON signal to the second on / off valve 823B, so that the supply of low pressure to the gap X continues. In other words, the arrangement is such that the supply of low pressure continues at all times except for the supply of atomized coolant to the gap X and the supply of high pressure immediately after the supply of atomized coolant. Effect of the second embodiment

[0085] With the above-described induction heating roller device 100 according to the present embodiment, immediately after the supply of atomized coolant is stopped, gas is supplied into the gap X, thus forcing the coolant remaining in the gap X to the outside, so that the atomized coolant can be prevented from condensing and depositing on the roller body 2, thus forming rust. Furthermore, insulation deterioration or short circuit due to the deposition of condensed coolant on the induction heating mechanism 3 can be prevented. Furthermore, the evaporation of coolant (condensate water) already condensed in the gap X can be promoted by supplying gas into the gap X, thus preventing the formation of rust inside the roller body 2 and the deterioration of the insulation of the induction heating mechanism 3. Modified examples of the second embodiment

[0086] The present invention is not limited to the second embodiment described above.

[0087] For example, in the second embodiment, the gas supply mechanism is formed using part of the cooling mechanism, thus simplifying the arrangement of the induction heating roller device. Alternatively, however, it is also possible to provide the cooling mechanism and the gas supply mechanism separately. It is possible to use an inert gas, such as nitrogen or argon, as the gas supplied by the gas supply mechanism instead of or in addition to air.

[0088] Furthermore, in the second embodiment, after stopping the supply of atomized coolant, two-stage supply of high-pressure air and low-pressure air is performed, but it is also possible to provide supply of air in three or more stages depending on the time elapsed since stopping the supply of atomized coolant by branching the compressed air supply circuit into three or more branches and providing a different pressure relief valve in each of these branches.

[0089] If, in the second embodiment, a cooling mechanism (gas supply mechanism) is provided on one side of the axle flanges and a rotary transformer on the other, and a rotary drive mechanism is attached to one end of the axle flanges, this can complicate the arrangement and make application difficult. In this case, it is preferable that the cooling mechanism be provided at the same end as the rotary transformer.

[0090] In this second embodiment, an induction heating roller device with double-sided support was described, but it is also possible to apply the invention to an induction heating roller device in which only one of the axle flanges is supported at two points. Furthermore, it is also possible to apply the invention to an induction heating roller device designed as a cantilever.

[0091] Furthermore, the cooling mechanism may include an atomizing device for generating atomized coolant, and a coolant supply pipe connected to the atomizing device for supplying atomized coolant to the gap. The coolant supply pipe has a plurality of coolant supply ports arranged along the axial direction of the substantially cylindrical gap formed between the roller body and the induction heating mechanism. The gas supply mechanism may be formed using the compressed air supply circuit and the coolant supply pipe.

[0092] Furthermore, in the second embodiment, it is provided that the atomized coolant is introduced from one axial end of the gap and led out from the other axial end, but it is also possible that the atomized coolant is introduced from one axial end of the gap and led out from the same axial end. Third embodiment

[0093] A third embodiment of an induction heating roller device according to the invention will be explained below with reference to the accompanying figures. Elements corresponding to those in the first and second embodiments are designated by the same reference numerals.

[0094] As in Fig. 12, the induction heating roller device 100 of this embodiment includes a guide member G that guides the atomized coolant flowing in the radial direction from the downstream openings (through holes 61H) at the axially upstream end of the gap downstream in the axial direction of the gap.

[0095] This guide part G is provided opposite the downstream openings (through holes 61H) at the axial end of the gap X (more precisely, at the connecting portion between the gap X1 and the gap X2), as shown in Fig. 13 and Fig. 14, and is an annular plate having a substantially arcuate cross-section provided over the entire circumference of the axial end of the gap X.

[0096] The guide member G is fixed to the inner surface of the axle flange 41 provided at the upstream end of the roller body 2. The guide member G is fixed with fasteners T, which have excellent heat insulation properties. A plurality of fasteners T are provided between the guide member G and the axle flange 41 to increase the heat insulation between the axle flange 41 and the guide member G, and the guide member G and the axle flange 41 are coupled in sections. The fasteners T are arranged equidistantly in the circumferential direction on the guide member G. It should be noted that the fasteners T can also form a ring shape and fasten the guide member G and the axle flange 41 to each other over the entire circumference.

[0097] Furthermore, the guide member G is arranged on the inner circumferential surface of the roller body 2 via a heat-insulating layer. In the present embodiment, the guide member G is arranged at a distance from the inner circumferential surface of the roller body 2, so that an air layer AS is provided between the two as a heat-insulating layer. By thus providing the air layer AS between the guide member G and the inner circumferential surface of the roller body 2, the roller body 2 is less exposed to the influence of heat due to the temperature of the guide member G. Thus, the guide member G is arranged so that it does not contact anything except the fastening elements T.

[0098] Furthermore, the downstream end G1 of the guide member G is positioned at substantially the same height as the axially upstream end surface 3X of the induction heating mechanism 3 (the cylindrical iron core 31) or further downstream in the axial direction. Thus, the guide member G can receive almost all of the atomized coolant flowing in the radial direction through the clearance X2 and redirect it in the axial direction, and the atomized coolant flowing in the radial direction can be prevented from directly colliding with the inner circumferential surface of the roller body 2. Effect of the third embodiment

[0099] With the above-described induction heating roller device 100 according to the present embodiment, the coolant flowing in the radial direction from the downstream openings (through holes 61H) in the coolant supply passage 84 is guided downstream in the axial direction of the gap X by the guide part G, so that the atomized coolant can be prevented from colliding with the inside of the axially upstream end of the roller body 2 and forming droplets. Thus, the axially upstream end of the roller body 2 can be prevented from being locally overcooled. Furthermore, by slightly redirecting the flow of the atomized coolant from the radial direction to the axial direction with the guide part G, the atomized coolant can be efficiently directed in the axial direction of the gap and easily pass through the entire gap X. Modified examples of the third embodiment

[0100] The present invention is not limited to the third embodiment described above.

[0101] The guide part G of the third embodiment is an annular plate having a substantially arcuate cross-section, but it may also be an annular plate having the shape of a truncated cone, as in Fig. 15 shown.

[0102] Furthermore, the guide part G of the third embodiment is fixed to the axle flange 41 by fastening elements T provided separately from the axle flange 41 and the guide part G, but alternatively, a fastening projection 41T may be formed on the inner surface of the axle flange 41 and the guide part G may be fixed to this projection 41, as shown in Fig.16. Furthermore, a fastening projection can also be formed on the guide part in a manner not shown in detail, and this projection can be fastened to the inner surface of the axle flange. It is also possible to fasten the axle flange and the guide part to one another without forming a projection. In this case, it is advantageous if the contact area between the axle flange and the guide part is as small as possible.

[0103] Furthermore, in the third embodiment, the guide part is fixed to the inner surface of the axle flange, but it is also possible to fix the guide part to the inner circumferential surface of the roller body.

[0104] Furthermore, the guide part is provided separately from the axle flange and the roller body, but it is also possible to provide the guide part in one piece with the axle flange or the roller body.

[0105] Also, the guide member is not limited to the shape of an annular sheet, and as long as it has a curved or partially conical guide surface that can redirect the radial flow of the atomized coolant into an axial flow, it is also possible to use an element other than a sheet.

[0106] If, in the third embodiment, a cooling mechanism is provided on one side of the axle flanges and a rotary transformer on the other, and a rotary drive mechanism is attached to one end of the axle flanges, this can complicate the arrangement and make application difficult. In this case, it is preferable that the cooling mechanism be provided at the same end as the rotary transformer.

[0107] In the third embodiment, an induction heating roller device with two-sided support was described, but it is also possible to provide an induction heating roller device in which only one of the axle flanges is supported at two points. Furthermore, it is also possible for the invention to be applied to an induction heating roller device designed as a cantilever.

[0108] Furthermore, in the third embodiment, it is provided that the atomized coolant is introduced from one axial end of the gap and led out from the other axial end, but it is also possible that the atomized coolant is introduced from one axial end of the gap and led out from the same axial end.

[0109] Furthermore, the invention is not limited to the first to third embodiments, but can of course be modified in many ways. INDUSTRIAL APPLICABILITY

[0110] With the present invention, a roller body can be cooled without providing a rotating seal mechanism on the roller body, thereby suppressing corrosion of the roller body.

Claims

[1] Induction heating roller device (100), comprising: a rotatably mounted roller body (2); an induction heating mechanism (3) for inductively heating the roller body (2), wherein the induction heating mechanism (3) is arranged within the roller body (2); and a cooling mechanism (8) having an atomizing device (81) for generating an atomized coolant, wherein the cooling mechanism (8) introduces the atomized coolant from one axial end into a substantially cylindrical space (X) formed between the roller body (2) and the induction heating mechanism (3), and guides the coolant out of the roller body (2) from one axial end of the space (X), wherein the atomizing device (81) is detachably provided on a bearing shaft (6A) provided at one end of the induction heating mechanism (3); and an ejection opening (81s) of the atomizing device (81) is mounted so as to be positioned on the center axis of a cavity (61) formed along the center axis within the bearing axis (6A). [2] The induction heating roller device (100) according to claim 1, wherein the cooling mechanism (8) has a coolant supply channel (84) formed inside a support shaft (6) extending from both ends of the induction heating mechanism (3) and guiding the atomized coolant coming from the atomizing device (81), an opening located downstream in this coolant supply channel (84) being arranged at the axial end of the gap (X). [3] Induction heating roller device (100) according to claim 2, wherein a plurality of the openings located downstream in the coolant supply channel (84) are provided in the radial direction in the bearing axis (6). [4] The induction heating roller device (100) according to claim 1, wherein the cooling mechanism (8) has a coolant discharge channel (85) for discharging the coolant that has passed through the gap (X) to the outside, the coolant discharge channel (85) being formed inside a bearing shaft (6) extending from both ends of the induction heating mechanism (3), and an opening upstream of this coolant discharge channel (85) being arranged at the axial end of the gap (X). [5] Induction heating roller device (100) according to claim 4, wherein a pressure relief device (9) for pressure relief of the gap (X) is provided in a coolant discharge pipe (85T) communicating with the coolant discharge channel (85). [6] The induction heating roller device (100) according to claim 1, wherein the atomizing device (81) is detachably provided on the outside of the roller body (2). [7] The induction heating roller device (100) according to claim 1, further comprising a gas supply mechanism that supplies gas into the interior of the gap (X) after stopping the supply of atomized coolant, and discharges the coolant inside the gap (X) to the outside. [8] The induction heating roller device (100) according to claim 1, wherein the cooling mechanism (8) includes a coolant supply passage (84) formed inside a bearing shaft (6) extending from both ends of the induction heating mechanism (3), a downstream opening of the coolant supply passage (84) opening into the outer circumferential wall of the bearing shaft (6), and the coolant supply passage (84) introduces the atomized coolant from the atomizing device (81) in the radial direction at the axial end of the gap (X), the induction heating roller device (100) further including a guide member (G) provided at an axial end of the gap (X) and guiding the atomized coolant flowing from the downstream opening in the radial direction downstream of the gap (X). [9] Induction heating roller device (100), comprising: a rotatably mounted roller body (2); an induction heating mechanism (3) for inductively heating the roller body (2), wherein the induction heating mechanism (3) is arranged within the roller body (2); and a cooling mechanism (8) for cooling the roller body (2) and the induction heating mechanism (3), the cooling mechanism (8) comprising: an atomizing device (81) for producing an atomized coolant; and a coolant supply pipe (86) connected to the atomizing device (81), which has a plurality of coolant supply ports provided in the radial direction of a cylindrical space (X) formed between the roller body (2) and the induction heating mechanism (3), and which supplies the atomized coolant to the space (X); wherein the atomizing device (81) is detachably provided on a bearing shaft (6A) provided at one end of the induction heating mechanism (3); and an ejection opening (81s) of the atomizing device (81) is mounted so as to be positioned on the center axis of a cavity (61) formed along the center axis within the bearing axis 6A.

Images