KR101673645B1 - Induction heat generation roller device - Google Patents

Abstract

The present invention is characterized in that it is not necessary to provide a rotating seal mechanism on the roller body and the roller body is cooled while suppressing the corrosion of the roller body and the roller body 2 and the roller body 2 (3) for guiding and heating the roller body (2), and a substantially tubular shape formed between the roller body (2) and the induction heating mechanism (3) And a cooling mechanism 8 for introducing the cooling medium from the axial end of the clearance X and discharging the cooling medium from the axial end of the clearance X to the outside of the roller body 2. [

Description

TECHNICAL FIELD [0001] The present invention relates to an induction heating roller device,

The present invention relates to an induction heating roller apparatus, and more particularly to an induction heating roller apparatus having excellent cooling performance.

Conventionally, a continuous heat treatment process of a continuous material such as a sheet material such as a plastic film, a paper, a cloth, a nonwoven fabric, a synthetic fiber, a metal foil or the like, or a web material, An induction heat generating mechanism is disposed inside the rotating roller body so that the peripheral wall of the roller body is heated by induction current.

In recent years, for example, there has been a demand to change the heating temperature by the roller body in a short period of time by changing the kind of the continuous material. In addition, from the viewpoint of safety and hygiene after the elongation treatment step is completed, the operator can not leave the roller body unless the temperature of the roller body falls below a predetermined temperature. For this reason, it is necessary to cool the roller body as short as possible.

In addition, the induction heating roller device is used not only for heating the continuous material but also for cooling, and it is necessary to provide a cooling function for the induction heating roller device.

As shown in Patent Document 1, a plurality of cooling medium passages are provided in the circumferential wall of the roller body at regular intervals in the circumferential direction along the central axis direction in the induction heating roller device having the cooling function as described above , And cooling the roller body by circulating the cooling medium in the cooling medium passage.

However, in order to circulate the cooling medium through the cooling medium passage, it is necessary to supply the cooling medium through the shaft body (journal portion) provided integrally with the roller body or the end portion thereof from the outside. Since the roller body or the journal portion is the rotating body, Rotary joints or rotating seals called mechanical seals are required. In this case, since all of them are constituted by the contact seal mechanism, the problem of leakage of the cooling medium can not be avoided due to wear, thermal deterioration or chemical deterioration of the seal portion. In order to avoid such a problem, maintenance or replacement of the rotary seal mechanism must be performed periodically. Naturally, in order to perform such repair or exchange, the induction heating roller device must be stopped, and the maintenance or replacement costs.

On the other hand, as shown in Patent Document 2, there is a structure in which a contact seal mechanism is not used. In the structure disclosed in Patent Document 2, a refrigerant introduction mechanism for introducing a cooling medium into the roller body and a cooling medium introduced by the refrigerant- The roller body is cooled by the latent heat of vaporization (vaporization heat) when the sprayed cooling medium contacts the inner peripheral wall of the roller body and is vaporized Is being considered. The coolant spraying mechanism has a discharge tube extending from one end to the other end of the inner peripheral wall of the roller body along the axial direction and spraying the cooling medium from the discharge port provided on the side wall of the discharge tube will be. With this configuration, by providing the refrigerant introducing mechanism and the spraying mechanism in a part of the induction heating mechanism held in the stationary state inside the roller body, no rotary seal mechanism is required, and the leakage of the cooling medium, , It is possible to prevent troubles such as exchange.

However, since the cooling medium is directly applied to the inner peripheral wall of the roller body, impurities or non-evaporative components contained in the cooling medium are deposited on the inner peripheral wall of the roller body.

Specifically, for example, when the refrigerant is water, impurities such as a calcium carbonate component and non-evaporation components are deposited on the inner peripheral wall of the roller body, or the roller body is corroded due to the dissolved chlorine component and rust is generated in the roller body Throw away. For example, if the cooling medium is an organic oil, the pyrolyzed carbide is deposited on the inner peripheral wall of the roller body. Further, when the cooling medium contains a chemical corrosion-causing component, the inner circumferential wall of the sprayed roller body is corroded and abraded.

Further, since the discharge tube of the refrigerant spreading mechanism is structured such that the cooling medium is sprayed through the fine holes, the dust or the like contained in the cooling medium may be clogged with fine holes to clog the spraying mechanism, There is a problem that the discharge pipe or the like must be exchanged for decomposition.

In addition, in the case of the induction heating roller device, there are cases where the continuous material is used as a heating roller for the purpose of heating and the case where it is used as a cooling roller for cooling the continuous material in some cases. In this case, when used as a heating roller after being used as a cooling roller, the cooling medium staying in the discharge tube of the refrigerant spreading mechanism is heated by heat transfer from the roller body, and in some cases boiling ).

Patent Document 1: JP-A-2000-353588 Patent Document 2: JP-A-2003-269442

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems and it is an object of the present invention to provide a roller bearing device capable of cooling a roller main body while suppressing corrosion of the roller main body, The main task is to do.

That is, the induction heat generating roller device according to the present invention includes: a roller body supported by a rotatable member; an induction heating device which is held in a stationary state with respect to the roller main body in the roller main body, And a mist generating device for generating a mist cooling medium, and introducing the cooling medium on the mist from the axial end of the clearance portion formed between the roller main body and the induction heating mechanism into a substantially cylindrical shape And a cooling mechanism for discharging the cooling medium from the axial end portion of the clearance portion to the outside of the roller body.

In this case, by introducing the fogged cooling medium into the roller body, latent heat of vaporization when the fogged cooling medium comes into contact with the inner peripheral wall of the roller body and evaporates, and when the fogged cooling medium rises in the clearance The roller body and the induction heating mechanism can be cooled by sensible heat and latent heat at the time of vaporization and evaporation. The fogging cooling medium is introduced from the axial end portion of the clearance portion and the cooling medium is discharged from the axial end portion of the clearance portion to the outside of the roller body to spread the misty cooling medium over the entire clearance portion. In addition, since the cooling medium is supplied and discharged at the axial end portion of the clearance portion, the internal structure of the roller body can be simplified, and the temperature influence of the roller body caused by disposing the component parts inside the roller body Can be ignored. In addition, since the mist cooling medium is used, the amount of cooling medium contacting the roller body can be reduced, and corrosion of the inner wall of the roller body, deposition of impurities, and the like can be suppressed.

In order to simplify the configuration of the roller body and to prevent the size of the induction heating roller device from being increased, the cooling mechanism is formed inside the support shaft extending from both ends of the induction heating mechanism, It is preferable that an opening on the downstream side of the cooling medium introduction path is disposed at an axial end portion of the clearance portion.

In order to uniformly supply a fog-like cooling medium to the gap portion and efficiently cool the roller body or the induction heating mechanism, it is preferable that a plurality of openings in the downstream side of the cooling medium introduction passage are provided in the radial direction desirable.

In order to simplify the configuration of the roller body and to prevent the size of the induction heating roller device from being increased, the cooling mechanism is formed inside the support shaft extending from both ends of the induction heating mechanism, And an upstream opening of the cooling medium discharge path is disposed at an axial end portion of the clearance portion.

It is possible to easily discharge the cooling medium from the clearance portion formed between the roller body and the induction heating mechanism to the cooling medium discharge path and to promote the vaporization of the fog cooling medium in the clearance portion, In order to prevent condensation in the inner peripheral wall and the induction heating mechanism, it is preferable that a decompression device for decompressing the gap portion is provided on a cooling medium discharge pipe communicating with the cooling medium discharge passage.

It is preferable that the mist generating device is detachably provided outside the roller body in order to easily detach and replace the mist generating device when the mist generating device has a problem.

An induction heating roller apparatus for cooling a roller body and / or an induction heating mechanism using a mist cooling medium, characterized in that, in the step of stopping (stopping) the cooling of the roller body and / or the induction heating mechanism, In order to prevent the generation of rust and / or the deterioration of the induction heating mechanism in the roller body caused by the cooling of the cooling medium, the gas is supplied into the clearance portion after the supply of the mist cooling medium is stopped, And a gas supply mechanism for discharging the medium to the outside.

In this case, after the supply of the cooling medium on the mist is stopped, gas is supplied to the clearance portion to discharge the cooling medium remaining in the clearance portion to the outside, so that the misty cooling medium adheres to the roller body and rust Can be prevented. It is also possible to prevent insulation deterioration and short-circuiting accidents caused by adhesion of the condensed cooling medium to the induction heating mechanism. In addition, by supplying the gas to the gap portion, vaporization evaporation of the cooling medium already dewed in the gap portion can be promoted, thereby preventing generation of rust and insulation deterioration of the induction heating mechanism inside the roller body have.

In order to efficiently discharge the misty cooling medium remaining in the clearance portion after the supply of the mist cooling medium is stopped to the outside before dew condensation, It is preferable to supply the gas to the gap portion. As for the timing of gas supply, the gas may be supplied immediately after the supply of the cooling medium on the mist is not stopped, but after a predetermined time has elapsed after the supply of the cooling medium is stopped.

By supplying the gas after stopping the supply of the cooling medium on the mist, the mist cooling medium in the gap portion is reduced, and it becomes unnecessary to supply a large amount of gas. On the other hand, even if it is no longer necessary to discharge the fogged cooling medium to the outside, it is necessary to evaporate the cooling medium which has been condensed and to prevent further condensation. From this viewpoint, it is preferable that the gas supply mechanism adjusts the gas flow rate supplied to the clearance portion in accordance with the elapsed time from the supply stop of the cooling medium on the mist.

In order to simplify the structure of the induction heating roller device by commoning the cooling mechanism and the gas supply mechanism, the cooling mechanism includes a mist generating device for generating a mist cooling medium, a compressed air supplying device for supplying compressed air to the mist generating device And a cooling medium supply circuit for supplying a cooling medium to the mist generation device, wherein the gas supply mechanism is configured using the compressed air supply circuit, and after the cooling medium supply circuit is closed So that the compressed air from the compressed air supply circuit is supplied to the gap portion through the mist generating device.

The residual cooling mist on the fog is removed and the condensed cooling medium is removed for a predetermined period of time immediately after the supply of the cooling medium on the mist has been stopped. In addition, after a certain period of time has elapsed, In order to perform the removal of the medium, the compressed air supply circuit is branched between the compressed air source and the mist generating device, and a high-pressure reducing valve for supplying high-pressure air for generating a misty cooling medium to the mist generating device Pressure reducing valve for supplying low-pressure air to the mist generating device, and a switching mechanism for switching the first branch passage and the second branch passage, wherein the first branch passage and the second branch passage are connected to each other, Wherein the gas supply mechanism is provided with a switching mechanism for switching the supply of the cooling medium to the gap section, It is preferable that the high pressure air is supplied using the first branch passage and the low pressure air is supplied using the second branch passage by the switching mechanism after the lapse of the predetermined period. If this is the case, the flow rate of the gas supplied to the gap portion can be changed by a simple configuration and control that only the first branch path and the second branch path are switched.

In order to more completely prevent condensation inside the roller body in a state in which no fogging cooling medium is supplied, the supply of the low-pressure air causes the supply of the cooling medium on the mist to the clearance, It is preferable to be configured to be carried out continuously other than the air supply.

In order to prevent the roller body from being locally over-cooled by the fogged cooling medium in supplying the fogged cooling medium into the clearance formed by the roller body and the induction heating mechanism, And the downstream side opening is opened in the outer circumferential surface of the support shaft, and a misty cooling medium from the mist generation device is formed in the axial direction end portion of the clearance portion in the radial direction And a guide portion provided at an axial end portion of the clearance portion and guiding the misty cooling medium flowing along the radial direction from the downstream opening to the downstream side in the axial direction of the clearance portion .

In this case, since the cooling medium flowing in the radial direction from the downstream opening of the cooling medium introduction path is guided to be switched to the downstream side in the axial direction of the clearance portion by the guide portion, the cooling medium in the mist- It is possible to reduce dropletization (droplet formation) caused by collision with the inner surface. Thus, it is possible to prevent the axial end portion of the roller body facing the downstream opening from being locally over-cooled. In addition, it is possible to efficiently change the flow of the mist cooling medium from the radial direction to the axial direction by the guide portion, so that the mist cooling medium can spread easily throughout the gap portion.

It is considered that the cooling medium in the mist is struck against the guide portion, so that the guide portion is excessively cooled as compared with other members. It is preferable that the guide portion is provided on the inner circumferential surface of the roller body with a heat insulating layer interposed therebetween in order to minimize the thermal influence of the roller body from the overly cooled guide portion.

The guide portion is fixed to the inner surface of the journal provided at both end portions of the roller body and is spaced apart from the inner circumferential surface of the roller body in order to reduce the thermal influence given to the roller body from the guide portion as much as possible, It is preferable to provide them.

In order to thermally separate the guide portion and the member to which the guide portion is fixed and to suppress the influence of the heat from the guide portion, the guide portion is provided on the member forming the axial end portion of the clearance portion, As shown in Fig.

Since the roller body rotates with respect to the induction heating mechanism, the roller body rotates with respect to the opening on the downstream side of the cooling medium introducing passage provided on the support shaft of the induction heating mechanism. In order to efficiently guide the misty cooling medium flowing in the radial direction from the downstream opening to the downstream side of the clearance portion under this configuration, it is preferable that the guide portion is provided on the entire periphery of the axial end portion of the clearance portion.

According to the present invention, there is provided an induction heating roller apparatus comprising: a roller body supported by a rotatable member; an induction heating mechanism disposed inside the roller body for inducing and heating the roller body; And a cooling mechanism for cooling the mist generating device, wherein the cooling mechanism includes: a mist generating device for generating a mist-like cooling medium; and an outline formed between the roller body and the induction heating device And a cooling medium supply pipe having a plurality of cooling medium supply ports arranged along the axial direction of the clearance part forming the cylindrical shape and supplying the misty cooling medium to the clearance part.

According to the present invention configured as described above, since the roller body is cooled by supplying the fog-like cooling medium to the clearance portion formed in a substantially cylindrical shape formed between the roller body and the induction heating mechanism, a rotary seal mechanism It is possible to cool the roller body while suppressing corrosion of the roller body.

1 is a sectional view of an induction heating roller device according to a first embodiment of the present invention.
2 is a cross-sectional view of the induction heat generating roller device according to a modified embodiment.
3 is a cross-sectional view of the induction heat generating roller device according to a modified embodiment.
4 is a cross-sectional view of an induction heating roller device according to a different modified embodiment.
5 is a cross-sectional view of an induction heating roller device according to another modified embodiment.
6 is a sectional view taken along line A-A of the induction heating roller device according to another modified embodiment.
7 is a cross-sectional view of a single-sided support type induction heating roller device according to another modified embodiment.
8 is a sectional view of the induction heat generating roller device according to the second embodiment of the present invention.
9 is a schematic diagram showing the configuration of each supply circuit in the second embodiment.
10 is a schematic diagram showing the control circuit of the temperature control device in the second embodiment.
11 is a diagram showing the control flow of the temperature control device in the second embodiment.
12 is a sectional view of an induction heat generating roller device according to a third embodiment of the present invention.
13 is an enlarged view mainly showing a cooling medium introduction path and a guide portion according to the third embodiment.
Fig. 14 is a sectional view taken along line A-A of the third embodiment. Fig.
15 is a partially enlarged cross-sectional view showing a guide portion according to a modified embodiment.
16 is a partially enlarged cross-sectional view showing a guide portion according to a different modified embodiment.

≪ First Embodiment >

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a first embodiment of the induction heating roller device according to the present invention will be described with reference to the drawings.

The induction heat generating roller device 100 according to the present embodiment is a sheet material or a web material such as a plastic film, a paper, a cloth, a nonwoven fabric, a synthetic fiber or a metal foil, , Yarn), and so on.

More specifically, as shown in Fig. 1, the apparatus includes a hollow cylindrical roller body 2 supported by a rotatable member, and an induction heating mechanism 3 accommodated in the roller body 2. As shown in Fig.

At both ends of the roller body 2, the journals 41 are mounted through a seal member S1 such as an O-ring. The seal member S1 prevents the later-described misty cooling medium from leaking to the outside. The journal 41 is integrally formed with the hollow drive shaft 42 and the drive shaft 42 is rotatably supported on the mechanical support 52 through a bearing 51 such as a rolling bearing. The roller body 2 is configured to rotate by a driving force externally applied by a rotation driving mechanism (not shown) such as a motor.

The induction heating mechanism 3 is composed of a cylindrical iron core 31 having a cylindrical shape and an induction coil 32 wound around the outer circumferential surface of the cylindrical iron core 31. Support shafts 6 are mounted on both ends of the cylindrical iron core 31, respectively. The support shaft 6 is inserted into the drive shaft 42 and is rotatably supported by the drive shaft 42 via a bearing 7 such as a rolling bearing. Thus, the induction heating mechanism 3 is kept stationary with respect to the roller body 2 in the rotating roller body 2. A lead wire L2 is connected to the induction coil 32 and an AC power source V for applying an AC voltage is connected to the lead wire L2. A seal mechanism S2 such as an oil seal or a labyrinth seal is provided between the outer surface of the support shaft 6 and the inner surface of the drive shaft 42, So that the cooling medium is not leaked to the outside.

When the alternating voltage is applied to the induction coil 32, an alternating magnetic flux is generated by the induction heating mechanism 3 and the alternating magnetic flux passes through the side wall 21 of the roller body 2 do. By this passage, an induced current is generated in the roller body 2, and the roller body 2 generates joule heat due to the induced current.

However, the induction heating roller device 100 of the present embodiment is provided with the cooling mechanism 8 for cooling the roller body 2 and the induction heating mechanism 3.

1, the cooling mechanism 8 is configured so that the fog-like cooling medium is introduced into the space between the roller body 2 and the induction heating mechanism 3, The roller body 2 and the induction heating mechanism 3 are cooled by discharging the cooling medium from the other axial end portion of the clearance X to the outside of the roller body 2 . The axial direction is the lateral direction of the paper as shown by the arrows in Fig.

More specifically, it includes a mist generating device 81 for generating a misty cooling medium, a compressed air supply circuit 82 for supplying compressed air to the mist generating device 81, A cooling medium introducing path 84 for introducing a misty cooling medium from the mist generating device 81 from one axial end portion of the clearance X, And a cooling medium discharge path (85) for discharging the cooling medium having passed through the clearance (X) from the other axial end to the outside.

The clearance X has airtightness and is mainly composed of a substantially cylindrical gap X1 formed by the inner circumferential wall surface of the roller body 2 and the outer circumferential surface of the induction heating mechanism 3, Shaped clearance X2 formed by the inner surfaces of the journals 41 provided at both ends of the main body 2 and the axial cross section of the induction heating mechanism 3. [

The mist generating device 81 mixes the compressed air from the compressed air supply circuit 82 and the water from the cooling medium supply circuit 83 to generate a misty (or misty) cooling medium. This fogged cooling medium has a particle diameter not to vaporize and evaporate immediately after being sprayed and also to a degree that it falls by gravity in the process of being carried with air or collides with the wall surface at the curved portion of the flow path, . Specifically, the mist-like cooling medium has a particle diameter in the range of 30 to 100 mu m.

The compressed air supply circuit 82 includes a compressed air source 821 and a compressed air pipe 822 having one end connected to the compressed air source 821 and the other end connected to the mist generating device 81, And an on-off valve 823 provided on the air pipe 822 for controlling supply and stop of the compressed air to the mist generating device 81.

The cooling medium supply circuit 83 includes a water storage tank 831, a cooling medium pipe 832 having one end connected to the water storage tank 831 and the other end connected to the mist generation device 81, A flow regulating valve 833 provided on the downstream side of the mist generating device 832 for regulating the flow rate of the cooling medium supplied to the mist generating device 81 and a mist generating device 81 And an open / close valve 834 for controlling the supply and stop of the cooling medium to the cooling medium.

The flow rate regulating valve 833 provided on the cooling medium pipe 832 receives the detection signal of the temperature sensor 2T buried in the peripheral wall of the roller body 2 and controls the voltage applied to the induction coil 32 A temperature signal indicative of the peripheral wall temperature of the roller body 2 is detected as a current signal through the amplifier A from the control section C to adjust the flow rate of the cooling medium. This makes it possible to adjust the supply amount of the fogging cooling medium in a stepless manner in response to the peripheral wall temperature of the roller body 2 so that the cooling rate and the cooling performance of the roller body 2 can be easily Can be adjusted. The detection signal from the temperature sensor 2T is output to the control unit C by the rotary transformer 10. [

The cooling medium introduction path 84 is provided with a hollow portion 61 formed along the center axis in a support shaft 6 (hereinafter, referred to as a support shaft 6A) provided at one end of the induction heating mechanism 3 Consists of. Concretely, the hollow portion 61 is a space having a substantially cylindrical shape formed coaxially with the central axis of the support shaft 6A.

The hollow portion 61 is opened at the outer end surface of the support shaft 6A and the discharge port 81s of the mist generating device 81 is mounted in the opening portion so as to face the inside of the hollow portion 61. Specifically, the discharge port 81s of the mist generating device 81 is mounted on the central axis of the hollow portion 61 so as to be positioned. Thus, the mist generating device 81 is provided at a position where the mist generating device 81 can easily be detached from the induction heating roller device 100 in the event of clogging or the like. The opening portion of the hollow portion 61 and the mist generating device 81 are detachably mounted through a seal structure (not shown).

The hollow portion 61 is in communication with the clearance X through a plurality of through holes 61H at the proximal end portion of the support shaft 6A (the end portion, the end on the side of the induction heating mechanism 3). This through hole 61H forms an opening on the downstream side of the cooling medium introduction path 84. [ The through holes 61H are arranged at one axial end portion (gap X2 in the present embodiment) of the clearance X and are formed at a plurality of equal intervals in the radial direction on the support shaft 6A. With this configuration, the mist-like cooling medium coming from the downstream opening (through hole 61H) is introduced along the radial direction at the axial upstream end of the clearance X. Specifically, the fogging cooling medium is introduced into the gap 41 between the inner surface of the journal 41 provided at both ends of the roller body 2 and the axial end surface 3X of the induction heating mechanism 3 Shaped gap X2 formed by the ring-shaped gap X2.

The cooling medium discharge path 85 is constituted by a cooling medium discharge pipe 85T provided along the inside of a support shaft 6 (hereinafter, referred to as "support shaft 6B") provided at the other end of the induction heating mechanism 3 . The cooling medium discharge pipe 85T is inserted into the hollow portion 62 formed along the center axis inside the support shaft 6B and is provided at the proximal end portion (the end on the side of the induction heating mechanism 3) And the opening thereof serves as an upstream side opening of the cooling medium discharge path 85. The opening of the cooling medium discharge path 85, The upstream-side opening is disposed in the other axial end portion of the clearance X (in the present embodiment, the clearance X2). A lead wire L2 connected to the above-described induction coil 32 is also provided in the hollow portion 62 of the support shaft 6B.

A decompression device 9 for decompressing the clearance X is provided on the cooling medium discharge pipe 85T outside the support shaft 6B. The decompression device 9 suctions air on the upstream side of the cooling medium discharge pipe 85T and discharges it to the outside to decompress the inside of the clearance X. As a result, the gap portion X is depressurized to facilitate evaporation of misty cooling medium introduced into the clearance X, so that the roller body 2 can be easily cooled, and at the same time, It is possible to prevent condensation on the inner peripheral wall of the main body 2 and the induction heating mechanism 3. [ In addition, the decompression device 9 is configured to allow the cooling medium on the mist to pass through the clearance X at a predetermined flow rate. Specifically, when the flow velocity of the mist-like cooling medium in the clearance X is 0.3 m / s or more, a high thermal conductivity can be obtained and the cooling efficiency of the roller body can be greatly improved.

The surface of the member forming the clearance X, more specifically, the inner peripheral wall surface of the roller body 2, the inner surface of the journal 41, And the outer circumferential surface of the support shaft 6 are waterproofed. On the outer circumferential surface of the induction heating mechanism 3, a waterproof film F is provided over substantially the entire surface in order to prevent electric failure by the cooling medium. This waterproof film F is necessary when the dew point temperature determined by the mist concentration in the roller body 2 and the condensation is concerned in the relationship between the dew point temperature during the cooling operation and the induction heating mechanism 3, The case where the temperature of the heat generating mechanism 3 is clearly higher than the dew point temperature can be omitted.

≪ Effects of First Embodiment >

According to the induction heat generating roller apparatus 100 of this embodiment thus constituted, by introducing the fog-like cooling medium into the roller body 2, the fog-like cooling medium comes into contact with the inner peripheral wall of the roller body 2, The roller body 2 or the induction heating mechanism 3 can be cooled by latent heat when the latent heat of vaporization and fog on the occasion of temperature rise in the roller body 2 and the latent heat upon vaporization and evaporation . The mist cooling medium is introduced from the axial end portion of the clearance portion X formed between the roller main body 2 and the induction heating mechanism 3 and formed in a substantially cylindrical shape, By discharging the cooling medium from the axial end portion to the outside of the roller body 2, it is possible to uniformly spread the mist cooling medium over the clearance X. In addition, since a fogging cooling medium is used, it is possible to reduce the amount of cooling medium contacting the roller body 2, and corrosion of the inner wall of the roller body 2, deposition of impurities, and the like can be suppressed. For example, when the temperature of the roller body 2 of the induction heating roller device is naturally cooled from 200 캜 to 150 캜, it takes about 30 minutes. However, by using the cooling mechanism 8, The time for cooling the temperature from 200 DEG C to 150 DEG C can be shortened to about 10 minutes.

≪ Modification of First Embodiment >

The present invention is not limited to the first embodiment.

In the first embodiment, a cooling mechanism 8 is provided at one end of the journal 41 and a rotary transformer 10 is provided at the other end. A rotary drive mechanism is provided at one end of the end of the journal 41 It is considered that the configuration becomes complicated and the application becomes difficult. In this case, as shown in Fig. 2, it is preferable that the cooling mechanism 8 is provided at the same end as the side where the rotary transformer 10 is equipped. At this time, since the lead wire L2 also passes through the hollow portion 62 of the support shaft 6B, the mist generating device 81 is mounted on the pipe 84T independent of the support shaft 6B. The cooling medium introduction path 84 extends from the other support shaft 6B to the proximal end of one of the support shafts 6A through the interior of the induction heating mechanism and extends from the proximal end of the support shaft 6A The downstream side opening of the cooling medium introduction path 84 is disposed at one axial end portion of the clearance X by the through hole 61H. The misty cooling medium introduced by the cooling medium introduction path 84 is discharged to the outside by the cooling medium discharge path 85 similar to the first embodiment.

3, the induction heating roller device for supporting only one of the journals 41 at two points by a rotating material is described. However, in the first embodiment, . At this time, the roller body 2 is supported at two points by two bearings 51a and 51b which are arranged so as to be separated from each other in the axial direction, for example. As the configuration of the cooling mechanism 8, it is considered that the same one as shown in Fig. 2 is applied.

4, 5, and so on, the cooling mechanism 8 includes a mist generating device 81 for generating a mist-like cooling medium, a mist generating device 81 connected to the mist generating device 81, And a plurality of cooling medium feed ports 86H arranged along the axial direction of the clearance portion X forming the substantially tubular shape formed between the induction heating mechanism 3 and the cooling medium supply port 86H, And a cooling medium supply pipe 86 for supplying the medium.

At this time, for example, as shown in Fig. 4, the cooling medium supply pipe 86 is connected to the mist generating device 81 at one end, and is arranged in the clearance X, for example, do. A cooling medium supply port (not shown) for supplying a misty cooling medium into the clearance X is formed on the outer circumferential surface of the portion disposed on the outer circumferential surface of the induction heating mechanism 3 in the cooling medium supply pipe 86 86H are formed. The cooling medium supplied to the clearance X by the cooling medium supply pipe 86 is discharged to the outside by the cooling medium discharge path 85 as in the first embodiment.

5 and 6, the cylindrical iron core 31 may be provided with the pipe accommodating portion 31M, and the cooling medium supply pipe 86 may be provided along the pipe accommodating portion 31M. At this time, as shown in Fig. 5, the pipe receiving portion 31M is provided along the axial direction. 5, the cooling medium supply port 86H of the cooling medium supply pipe 86 is located between the induction coils 32 intermittently provided on the outer circumferential surface of the cylindrical iron core 31, A misty cooling medium is supplied from the coil 32 to the clearance X. In this modified embodiment, the cooling medium discharge path 85 is integrally formed on the side wall of the support shaft 6B, and the cooling medium discharge pipe 85T is connected to the downstream end. Although only one cooling medium supply pipe 86 is shown in Figs. 5 and 6, a plurality of cooling medium supply pipes 86 may be provided.

In addition, as shown in Fig. 7, the present invention can be applied to an induction heat generating roller device 100 of a so-called piece-supporting type. The members corresponding to those of the first embodiment are denoted by the same reference numerals.

The induction heat generating roller device 100 includes a cylindrical roller body 2 having a bottom surface having a shaft fitting portion 2a at a central portion of the bottom portion thereof and a roller body 2 inserted into the hollow interior of the roller body 2, A housing MH of the motor M is fixed at one end and a shaft end of the motor M is fixed at the other end of the roller M to the roller main body 2. The motor M has a rotation shaft M1 fitted to the shaft- A bearing housing (mechanical support 12) extending into the hollow and supporting the rotating shaft M1 via bearings 11a and 11b and a bearing housing 12 fixed to the bearing housing 12 along the inner circumferential surface of the roller body 2 An induction heating mechanism 3 for heating the roller body 2 and a cooling mechanism 8 for cooling the roller body 2 and the induction heating mechanism 3. [

The cooling medium introduction path 84 of the cooling mechanism 8 is formed in the bearing housing 12. [ Specifically, the cooling medium introduction path 84 has one end opened at the outer wall surface (rear end surface) of the bearing housing 12 and the other end opened at the other end between the roller main body 2 and the other end of the bearing housing 12 (The front end face) forming the gap portion X3 (which communicates with the clearance portion X formed between the roller body 2 and the induction heating mechanism 3) A discharge port 81s of the mist generating device 81 is detachably attached to one end of the cooling medium introducing path 84 through a seal structure (not shown).

A cooling medium discharge path 85 of the cooling mechanism 8 is also formed in the bearing housing 12. Specifically, the cooling medium discharge path 85 is opened at a wall surface in contact with the clearance X4 formed between the induction heating mechanism 3 and the rotary shaft M1, and the other end is opened at the bearing housing 12 In Fig. A cooling medium discharge pipe 85T provided with a pressure reducing device 9 is connected to the opening of the rear end surface of the cooling medium discharge path 85. [ In this modified embodiment, the cooling medium introduction path 84 and the cooling medium discharge path 85 may be reversed.

In order to prevent the mist cooling medium from leaking to the outside between the flange portion 12F covering the opening portion of the roller body 2 in the bearing housing 12 and the opening portion of the roller body 2, A non-contact seal S3 such as a labyrinth seal is provided. In order to prevent the mist-like cooling medium from leaking to the outside between the rotary shaft M1 and the bearing housing 12 at the leading end side of the leading end side bearing 11a, for example, a noncontact seal such as a labyrinth seal (S4) are provided.

In addition, although in the first embodiment, the fog-like cooling medium is supplied to the gap portion, a piping is provided in the induction heating mechanism, and a mist cooling medium is circulated in the piping, whereby the induction heating mechanism is preferentially Or may be configured to be cooled. This makes it possible to prevent the deterioration of the performance of the electric wire and the iron core constituting the induction coil.

Further, in the first embodiment, the fog-like cooling medium is introduced from one end portion in the axial direction of the clearance portion and discharged from the other end portion in the axial direction. However, the cooling medium is introduced from one end portion in the axial direction of the clearance portion, As shown in FIG.

≪ Second Embodiment >

Hereinafter, a second embodiment of the induction heating roller device according to the present invention will be described with reference to the drawings. The members corresponding to the first embodiment are denoted by the same reference numerals.

8, the induction heat generating roller device 100 according to the present embodiment includes a hollow cylindrical roller body 2 supported by a rotatable member and a roller body 2 And a cooling mechanism 8 for cooling the roller body 2 and the induction heating mechanism 3 by a mist cooling medium.

The compressed air supply circuit 82 according to the present embodiment is provided with a compressed air source 821 and a compressed air pipe 822 having one end connected to the compressed air source 821 and the other end connected to the mist generating device 81 Closing valve 823 provided on the compressed air pipe 822 for controlling the supply and stop of the compressed air to the mist generating device 81 and the opening / closing valve 823 provided downstream of the opening / closing valve 823 And a flow rate adjusting valve 824 (in this embodiment, a pressure reducing valve) for adjusting the flow rate of the compressed air supplied to the mist generating device 81. The specific configuration of the compressed air supply circuit 82 and the specific control state of the temperature control device TC with respect to the opening / closing valve 823 will be described later.

The cooling medium supply circuit 83 of the present embodiment includes a water storage tank 831 and a cooling medium pipe 832 having one end connected to the water storage tank 831 and the other end connected to the mist generating device 81, An on-off valve 834 provided on the cooling medium pipe 832 for controlling supply and stop of the cooling medium to the mist generating device 81, And a flow rate regulating valve 833 (in this embodiment, a pressure reducing valve) for regulating the flow rate of the cooling medium supplied to the mist generating device 81. The opening / closing valve 834 is an electromagnetic valve that is opened or closed by an ON / OFF signal from the temperature control device TC. The specific control state of the temperature control device TC will be described later.

However, in the induction heating roller device 100 of the present embodiment, after the supply of the cooling medium on the mist to the clearance portion X by the cooling mechanism 8 is stopped, the cooling medium removing gas is supplied into the clearance portion X And a gas supply mechanism for discharging the cooling medium present in the clearance X to the outside.

This gas supply mechanism is constituted by using a part of the structure of the cooling mechanism 8. Specifically, the gas supply mechanism is constructed by using the compressed air supply circuit 82 and the cooling medium introduction path 84, and after the cooling medium supply circuit 83 of the cooling mechanism 8 is removed, The compressed air from the circuit 82 is supplied to the clearance portion X through the mist generating device 81 and the cooling medium introducing path 84. [ The air supplied to the clearance X is discharged to the outside through the cooling medium discharge path 85.

8 and 9, the compressed-air supply circuit 82 constituting the gas supply mechanism is configured such that the compressed-air pipe 822 is branched between the compressed-air source 821 and the mist generating device 81, And includes a first branch passage 822A having a high pressure reducing valve 824A for supplying high pressure air for generating cooling medium on the mist to the mist generating device 81 and a second branch passage 822A for supplying low pressure air to the mist generating device 81 A second branch passage 822B having a low-pressure reducing valve 824B for feeding the first branch passage 822A, and a switching mechanism for switching the first branch passage 822A and the second branch passage 822B. The flow rate of the low-pressure air supplied by the second branch passage 822B is set to be smaller than the flow rate of the high-pressure air supplied by the first branch passage 822A, and is set to, for example, about 10%.

The switching mechanism of the present embodiment is constituted by the first opening / closing valve 823A and the second opening / closing valve 823B provided in the first branch passage 822A and the second branch passage 822B, respectively. The first on-off valve 823A and the second on-off valve 823B are electromagnetic valves that are opened and closed by an ON / OFF signal from the temperature control device TC. Further, as the switching mechanism, a three-way switching valve may be provided at a branch point or a confluence point of the first branch path 822A and the second branch path 822B.

Next, the temperature control of the induction heating roller device 100 of the present embodiment will be described with reference to Figs. 10 and 11 together with the operation of the cooling mechanism 8 and the gas supply mechanism. 10 is a control circuit diagram of the compressed air supply circuit 82 and the cooling medium supply circuit 83 in the temperature control device TC and FIG. 11 is a control circuit diagram showing the temperature of the roller body 2 and the induction heating mechanism 3 Coil electric power), the compressed air supply circuit 82, the ON / OFF of the open / close valves 823A and 823B, and the operations of the cooling medium supply circuit 83 and the open / close valve 834) Fig.

The temperature control device TC receives the detection signal of the temperature sensor 2T embedded in the peripheral wall of the roller body 2 through the temperature detection device (specifically, the rotary transformer 10) The control unit 20 compares the temperature PV and the predetermined set temperature SV and controls the supply of power to the induction coil 32 and the supply of the cooling medium on the mist so that the detected temperature PV becomes the set temperature SV. The temperature control device TC further includes an induction coil 32 which is connected to the power regulating device 11 configured by using a thyristor in correspondence with the difference between the detected temperature PV and the set temperature SV, And outputs a signal to be input to the input terminal.

When the detected temperature PV is higher than the set temperature SV, the temperature controller TC supplies the cooling medium in the form of mist And outputs an ON signal to the first on-off valve 823A on the first branch path 822A of the air supply circuit 82 and the on-off valve 834 on the cooling medium supply circuit 83. [ 11 shows a mode in which a mist cooling medium is supplied to the clearance X when the detected temperature PV is higher than the set temperature SV + 1 占 폚. As a result, the first on-off valve 823A and the on-off valve 834 are opened, and compressed air and the cooling medium are supplied to the mist generating device 81 to generate a mist-like cooling medium.

Thereafter, the temperature control device TC stops the supply of the mist cooling medium at the stage where the roller body 2 is cooled by the mist-like cooling medium and the detected temperature PV is lower than the set temperature SV Off valve 823A and the open / close valve 834 to turn off the first and second valves. At this time, the open / close valve 823A on the first branch passage 822A closes late by the predetermined time set by the delay timer T1, and only the high-pressure air is supplied through the mist generating device 81 And is continuously supplied into the clearance X. That is, the high-pressure air is supplied to the clearance portion X for a predetermined period of time immediately after the supply of the cooling medium on the mist is stopped, so that the misty cooling medium remaining in the clearance X can be discharged to the outside, The condensing cooling medium (condensation water) can be evaporated and discharged to the outside. Further, by supplying the high-pressure air immediately after stopping, the time for condensation of the residual misty cooling medium is made as short as possible.

When the first on-off valve 823A on the first branch path 822A is blocked, the temperature control device TC is connected to the second on-off valve 823B on the second branch path 822B And outputs an ON signal. As a result, the second on-off valve 823B is opened, and only the low-pressure air is supplied into the clearance X through the mist generating device 81. [ As described above, the high-pressure air is supplied by the switching mechanism using the first branch passage 822A for a certain period of time immediately after the supply of the cooling medium on the mist to the clearance X is stopped, And is configured to supply low-pressure air using the second branch passage 822B by the mechanism. That is, the flow rate of the gas supplied to the clearance X is adjusted in two steps (high-pressure air and low-pressure air) in accordance with the elapsed time from the supply stop of the mist cooling medium. By supplying the low-pressure air after a lapse of a predetermined time in this manner, it is possible to prevent internal condensation and to remove the condensed cooling medium.

Thereafter, during the period from when the supply of the fog cooling medium is started, that is, until the detection temperature PV exceeds the set temperature SV and the cooling operation is started, the temperature control device TC ) Continuously outputs an ON signal to the second on-off valve 823B so as to continuously supply the low-pressure air to the clearance X. That is, the supply of the low-pressure air is configured to be performed continuously from time to time other than the supply of the cooling medium on the mist to the clearance X and the supply of the high-pressure air after the supply of the mist cooling medium.

≪ Effects of Second Embodiment >

According to the induction heating roller apparatus 100 according to this embodiment configured as described above, after the supply of the cooling medium on the mist is stopped, the cooling medium remaining in the clearance X is supplied to the clearance X By discharging it to the outside, it is possible to prevent the fog-like cooling medium from condensing and adhering to the roller body 2 to generate rust. In addition, it is possible to prevent insulation deterioration and short-circuiting accidents caused by adhesion of the condensed cooling medium to the induction heat generating mechanism (3). In addition, by supplying the gas to the gap portion X, it is possible to promote vaporization evaporation of the cooling medium (condensation water) already dew condensed in the clearance portion X, The generation of rust and the insulation deterioration of the induction heating mechanism 3 can be prevented.

≪ Modification of Second Embodiment >

The present invention is not limited to the second embodiment.

For example, in the second embodiment, the gas supply mechanism is configured using a part of the cooling mechanism to simplify the configuration of the induction heating roller device. However, the cooling mechanism and the gas supply mechanism may be provided separately . At this time, as the gas supplied by the gas supply mechanism, it is considered to use an inert gas such as nitrogen gas or argon gas in addition to air.

In the second embodiment, the two-stage supply of the high-pressure air and the low-pressure air is performed after the supply of the fog-like cooling medium is stopped. However, the number of branches of the compressed- , It is also possible to supply the air in three or more stages in response to the elapsed time from the stop of supply of the cooling medium on the mist by using the other decompression valve in each branch.

In the second embodiment, when a cooling mechanism (gas supply mechanism) is provided on one end side of the journal and a rotary transformer is provided on the other end side and a rotary drive mechanism is mounted on one end of the journal, , It is considered that application becomes difficult. In this case, it is preferable that the cooling mechanism is provided at the same end as the side equipped with the rotary transformer.

In the above-described second embodiment, the induction heating roller device having both side supports is described. However, the present invention can also be applied to an induction heating roller device in which only one side of the journal is supported at two points by a rotary material. In addition, the present invention can be applied to a so-called one-side support type induction heating roller device.

Further, it is preferable that the cooling mechanism includes a mist generation device for generating a mist-like cooling medium, and a plurality of (for example, two or more) cylinders arranged along the axial direction of the clearance portion formed between the roller body and the induction heating mechanism, And a cooling medium supply pipe for supplying a misty cooling medium to the clearance portion. At this time, the gas supply mechanism is constructed using a compressed air supply circuit and a cooling medium supply pipe.

Further, in the second embodiment, the mist cooling medium is introduced from one end portion in the axial direction of the clearance portion and discharged from the other axial end portion. However, the cooling medium is introduced from one axial end portion of the clearance portion, As shown in FIG.

≪ Third Embodiment >

Hereinafter, a third embodiment of the induction heating roller device according to the present invention will be described with reference to the drawings. The members corresponding to the first and second embodiments are given the same reference numerals.

As shown in Fig. 12, the induction heat generating roller device 100 according to the present embodiment is arranged so that the axial direction upstream end of the clearance X from the downstream opening (through hole 61H) And a guide portion G for guiding the flowing misty cooling medium to the downstream side in the axial direction of the clearance portion X. [

As shown in Figs. 13 and 14, the guide portion G is provided at the axial side end portion of the clearance X (concretely, the connection portion of the clearance X1 and clearance X2) Hole 61H), and is an annular plate having a substantially curved cross section provided on the entire periphery of the axial end portion of the clearance X.

The guide portion G is fixed to the inner surface of the journal 41 provided at the upstream side end portion of the roller body 2. At this time, the guide portion G is fixed by a fixing member T made of a material having excellent heat insulating properties. A plurality of fixing members T are provided between the guide portions G and the journals 41 in order to increase the thermal separating action between the journals 41 and the guide portions G, And the journals 41 are partially connected. The plurality of fixing members T are arranged at regular intervals in the circumferential direction of the guide portion G. [ The fixing member T may have a ring-like shape, and the guide portion G and the journal 41 may be fixed over the entire circumferential direction.

The guide portion G is provided on the inner circumferential surface of the roller body 2 with a heat insulating layer interposed therebetween. In the present embodiment, the guide portion G is provided apart from the inner circumferential surface of the roller body 2 The air layer AS is interposed as a heat insulating layer. The air layer AS is provided between the guide portion G and the inner circumferential surface of the roller body 2 so that the roller body 2 is hardly affected by the temperature of the guide portion G . As described above, the guide portion G is disposed so as not to come into contact with any portion other than the fixing member T.

The downstream side end portion G1 of the guide portion G is located at substantially the same position as the upstream side end face 3X of the induction heating mechanism 3 (cylindrical iron core 31) in the axial direction, And is located on the downstream side. As a result, the guide portion G can receive the cooling medium in the form of a fog almost entirely passing through the clearance X2 in the radial direction and can change the direction in the axial direction, so that the guide portion G can move in the radial direction on the inner peripheral surface of the roller body 2 Thereby preventing the flowing misty cooling medium from directly colliding with each other.

≪ Effect of Third Embodiment >

According to the induction heating roller apparatus 100 according to the present embodiment configured as described above, the cooling medium flowing in the radial direction from the downstream opening (through hole 61H) of the cooling medium introducing path 84 is guided to the guide portion G Guiding to the downstream side in the axial direction of the clearance X can prevent dropletization caused by collision of the mist cooling medium against the inner surface of the axial upstream end of the roller body 2. This can prevent the axial upstream end of the roller body 2 from being locally over-cooled. Further, by easily changing the flow of the mist cooling medium from the radial direction to the axial direction by the guide portion G, the mist cooling medium can be efficiently switched in the axial direction of the clearance portion X, Can easily spread evenly throughout the part (X).

≪ Modification of Third Embodiment >

The present invention is not limited to the third embodiment.

The guide portion G of the third embodiment is an annular plate having a generally curved section, but may be an annular plate having a partial cone shape as shown in Fig. 15 .

The guide portion G of the third embodiment is configured to be fixed to the journal 41 by the fixing member T which is separate from the journal 41 and the guide portion G, A fixing protrusion 41T may be formed on the inner surface of the journal 41 and the guide portion G may be fixed to the protrusion 41T as shown in Fig. Although not shown, a fixing protrusion may be formed in the guide portion, and the protrusion may be fixed to the inner surface of the journal. Further, the journals and the guide portions may be fixed without forming the projecting portions. At this time, it is preferable that the contact area between the journal and the guide portion is made as small as possible.

In the third embodiment, the guide portion is fixed to the inner surface of the journal. However, the guide portion may be fixed to the inner circumferential surface of the roller body.

Furthermore, although the guide portion is separate from the journal and the roller body, the guide portion may be integrally formed with the journal or the roller body by integral molding.

Further, the guide portion is not limited to the annular plate but may be a plate having a curved or conical guide surface for converting the radial flow of the mist cooling medium into the axial flow, You may.

In the third embodiment, when a cooling mechanism is provided at one end of the journal and a rotary transformer is provided at the other end, and the rotary drive mechanism is mounted on one end of the journal, the configuration becomes complicated, . In this case, it is preferable that the cooling mechanism is provided at the same end as the side equipped with the rotary transformer.

In the above-described third embodiment, the induction heating roller device having both side supports is described. However, the present invention can also be applied to an induction heating roller device in which only one side of the journal is supported at two points by a rotary material. In addition, the present invention can be applied to a so-called one-side support type induction heating roller device.

Further, in the third embodiment, the mist cooling medium is introduced from one end portion in the axial direction of the clearance portion and is discharged from the other axial end portion. However, the cooling medium is introduced from one axial end portion of the clearance portion, As shown in FIG.

In addition, it is needless to say that the present invention is not limited to the first to third embodiments, and that various modifications are possible within the scope not departing from the spirit of the present invention.

[Industrial Availability]

According to the present invention, there is no need to provide a rotary seal mechanism in the roller body, and the roller body can be cooled while suppressing corrosion of the roller body.

100 ... Induction heating roller unit 2 ... Roller body
3 ... Induction heating device X ... Gap portion
6 ... Support shaft 8 ... Cooling mechanism
81 ... Mist generating device 84 ... Cooling medium introduction route
85 ... Cooling medium discharge line 9 ... Decompression device

Claims (10)

A roller body supported by a rotatable member,
An induction heating mechanism which is accommodated in the roller body and induction heat of the roller body;
A mist generating device for generating a mist cooling medium and introducing the mist cooling medium from an axial end portion of a cylindrical gap portion formed between the roller body and the induction heating mechanism, And a cooling mechanism for discharging the cooling medium from the axial end portion of the clearance portion to the outside of the roller body,
And the mist generating device is detachably provided on a support shaft provided at one end of the induction heating device. In claim 1,
Wherein the cooling mechanism includes a cooling medium introduction path formed inside a support shaft extending from both ends of the induction heating mechanism and for distributing a fogged cooling medium from the mist generation device, And an opening is disposed at an axial end portion of the clearance portion. In claim 2,
Wherein a plurality of openings on the downstream side of the cooling medium introduction path are provided in the radial direction on the support shaft. In claim 1,
Wherein the cooling mechanism includes a cooling medium discharge path formed inside a support shaft extending from both ends of the induction heating mechanism and for discharging the cooling medium having passed through the clearance part to the outside, And an opening is disposed at an axial end portion of the clearance portion. In claim 4,
And a decompression device for decompressing the gap portion is provided on a cooling medium discharge pipe communicating with the cooling medium discharge path. In claim 1,
And the mist generating device is detachably provided outside the roller body. In claim 1,
Further comprising a gas supply mechanism for supplying a gas into the gap portion after stopping (stopping) the supply of the cooling medium on the mist, and discharging the cooling medium present in the gap portion to the outside. In claim 1,
Wherein the cooling mechanism is formed inside a support shaft extending from both ends of the induction heating mechanism and the downstream side opening is open at an outer circumferential surface of the support shaft and a misty cooling medium from the mist generation device And a cooling medium introduction path for introducing the cooling medium along the radial direction at the axial end,
And a guide portion provided at an axial end portion of the clearance portion and guiding a misty cooling medium flowing along a radial direction from the downstream opening to the downstream side in the axial direction of the clearance portion. A cylindrical roller body having a bottom surface having a shaft fitting portion at a central portion of the bottom,
A motor having a rotation shaft inserted into the hollow interior of the roller body and having a tip end portion fitted to the shaft fitting portion of the roller body;
A bearing housing extending into the hollow of the roller body and supporting the rotary shaft through a bearing,
An induction heating mechanism fixed to the bearing housing along the inner peripheral surface of the roller body to generate heat,
A mist generating device for generating a mist cooling medium and introducing the mist cooling medium from an axial end portion of a cylindrical gap portion formed between the roller body and the induction heating mechanism, And a cooling mechanism for discharging the cooling medium from the axial end portion of the clearance portion to the outside of the roller body,
And the mist generating device is detachably provided on a support shaft provided at one end of the induction heating device. A roller body supported by a rotatable member,
An induction heating mechanism which is accommodated in the roller body and induction heat of the roller body;
And a cooling mechanism for cooling the roller body and the induction heating mechanism,
Wherein the cooling mechanism comprises:
A mist generating device for generating a misty cooling medium,
And a plurality of cooling medium supply ports connected to the mist generating device and arranged along the axial direction of the cylindrical gap portion formed between the roller body and the induction heating mechanism, And a cooling medium supply pipe for supplying the cooling medium,
And the mist generating device is detachably provided on a support shaft provided at one end of the induction heating device.

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