Induction heating roller device

Abstract

This invention provides an induction heating roller device that more quickly stabilizes the surface temperature distribution of the shell portion of the roller body. The roller body (2) has a cylindrical shell portion (21) and journals (22) respectively provided at both axial ends of the shell portion (21). The journals (22) have: a cylindrical fitting portion (221) that fits into the inner circumferential surface of the axial end of the shell portion (21); an annular end plate portion (222) that engages with the open end face of the axial end of the shell portion (21); and a cylindrical drive shaft portion (223) that extends axially outward from the end plate portion (222). The fitting portion (221) extends axially inward beyond the axial end of the induction coil (32), forming a first jacket chamber (21x) containing a heat medium along the axial direction within the wall thickness of the shell portion (21), and a second jacket chamber (221x) containing a heat medium along the axial direction within the wall thickness of the fitting portion (221).

Description

Technical Field

[0001] This utility model relates to an induction heating roller device. Background Technology

[0002] In continuous heat treatment processes of continuous materials such as plastic film, paper, cloth, non-woven fabric, synthetic fiber, metal foil, etc., sheets or meshes, wires (filaments), an induction heating roller device is used where an induction heating mechanism is configured inside a rotating roller body, thereby heating the peripheral wall of the roller body through induced current.

[0003] As shown in Patent Document 1, an induction heating roller device can be considered where an auxiliary induction coil is arranged opposite to an end plate fitted into the end of the roller body. In this induction heating roller device, the end plate is induced to heat by the auxiliary induction coil, reducing the temperature drop at the end of the roller body. This achieves a better and more stable temperature distribution than immediately after the roller has finished heating.

[0004] Patent Document 1: Japanese Statute No. 2-31999

[0005] However, there are limits to how quickly the surface temperature distribution of the roller body can be stabilized by simply inducing heat in the end plate that is fitted into the end of the roller body. Utility Model Content

[0006] Therefore, this invention was made to solve the above-mentioned problems, and its main objective is to stabilize the axial surface temperature distribution of the shell portion of the roller body more quickly.

[0007] That is, the induction heating roller device of this utility model includes: a hollow roller body, which is supported to be rotatable; and an induction heating mechanism disposed in the hollow part of the roller body, having an induction coil. The roller body has a cylindrical shell and journals respectively disposed at both axial ends of the shell. The journals have: a cylindrical fitting part that fits into the inner circumferential surface of the axial end of the shell; an annular end plate part that engages with the open end face of the axial end of the shell; and a cylindrical drive shaft part that extends axially outward from the end plate part. The fitting part extends axially inward more than the axial end of the induction coil. A first jacketed chamber containing a heating medium is formed axially within the wall thickness of the shell, and a second jacketed chamber containing a heating medium is formed axially within the wall thickness of the fitting part.

[0008] In the case of the induction heating roller device of this utility model, since the fitting portion of the journal extends further inward along the axial direction than the axial end of the induction coil, and a second jacket chamber is formed along the axial direction within the wall thickness of the fitting portion, the fitting portion is induction heated by the induction coil, and the axial temperature of the fitting portion can be stabilized rapidly. As a result, the temperature drop at the axial end of the shell portion can be suppressed, and the axial surface temperature distribution of the shell portion can be stabilized more quickly. Furthermore, the first jacket chamber is formed along the axial direction within the wall thickness of the shell portion, and combined with the structure in which a second jacket chamber is provided in the fitting portion, the axial surface temperature of the shell portion of the roller body can be quickly stabilized. Furthermore, by suppressing the temperature drop at the axial end of the shell, the effective length portion in the shell that is in contact with the heated object can be expanded (the ineffective length portion is reduced) without extending the ineffective length portion formed at the axial end of the shell. Furthermore, by suppressing the temperature drop at the axial end of the shell, the reduction in diameter at the axial end of the shell compared to the axial center can be eliminated.

[0009] Preferably, the second jacket chamber extends axially inward more than the axial end of the first jacket chamber. With this structure, the first and second jacket chambers overlap axially, and the heat transfer in the first and second jacket chambers interacts with each other, which can homogenize the temperature of the shell and the mating part. As a result, the axial surface temperature of the shell of the roller body can be stabilized quickly.

[0010] Preferably, a third jacketed chamber containing a heat medium is formed radially within the wall thickness of the end plate portion. The end plate portion is heated by heat transfer from the mating portion. Because a third jacket chamber is formed radially in this end plate portion, the heat generated when the mating portion is induction heated rapidly spreads to both the mating portion and the end plate portion. As a result, temperature drop at the axial end of the shell portion can be suppressed, and the axial surface temperature of the shell portion of the roller body can be quickly stabilized. Furthermore, the mating portion and end plate portion can thermally expand in the same way as the shell portion, preventing the end plate portion from becoming a constraint on the shell portion. Consequently, a decrease in the roundness accuracy of the shell portion can be prevented, and excessive stress on the end plate portion can be prevented from causing breakage.

[0011] Preferably, a fourth jacketed chamber containing a heat medium is formed axially within the wall thickness of the drive shaft portion. The drive shaft is heated by heat transfer from the mating part and the end plate part. Since a fourth jacket chamber is formed along the axial direction in this drive shaft, the heat generated when the mating part is induction heated quickly spreads to the mating part, the end plate part, and the drive shaft part. As a result, temperature drop at the axial end of the shell part can be suppressed, and the axial surface temperature of the shell part of the roller body can be quickly stabilized. Furthermore, the mating part, the end plate part, and the drive shaft part can undergo thermal expansion in the same way as the shell part, preventing the end plate part and the drive shaft part from becoming constraints on the shell part. Consequently, a decrease in the roundness accuracy of the shell part can be prevented, and excessive stress in the end plate part and the drive shaft part can be prevented from causing breakage.

[0012] Preferably, an annular groove-shaped fitting recess is formed on the inner circumferential surface of the axial end of the housing portion for the fitting portion to engage. Here, it is preferable that, when the fitting portion is engaged in the fitting recess, the inner circumferential surface of the fitting portion and the inner circumferential surface of the housing portion that is further inward than the fitting recess are substantially on the same plane. Furthermore, it is preferable that the induction coil has the same outer diameter from one axial end to the other axial end. With this structure, even if the fitting portion is configured to extend further axially inward than the axial end of the induction coil, the distance between the outer circumferential surface of the induction coil and the inner circumferential surface of the housing can be reduced. As a result, magnetic coupling can be improved, enabling high power factor heating of the housing.

[0013] Preferably, the induction coil is divided in the axial direction, having an induction coil for the shell portion that causes the shell portion to generate heat, and an induction coil for the fitting portion that causes the fitting portion to generate heat. With this structure, the induction heating of the shell and the fitting portion can be controlled independently. By controlling the induction heating of the fitting portion independently, the effect of heating the fitting portion (suppressing temperature drop at the axial end of the shell) can be maximized.

[0014] Furthermore, preferably, the induction heating roller device of this invention includes: a temperature sensor for detecting the temperature of the journal shaft; and a control device for controlling the power supply to the induction coil of the fitting part based on the temperature detected by the temperature sensor. With this structure, the journal can be controlled at any temperature, and the axial surface temperature of the roll body shell can be stabilized quickly.

[0015] According to this invention, the axial surface temperature of the shell portion of the roller body can be quickly stabilized. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view schematically illustrating the structure of an induction heating roller device according to one embodiment of the present invention. Figure 2 This is a partially enlarged cross-sectional view of a feature portion of the same embodiment. Figure 3 This is a cross-sectional view schematically illustrating the structure of an induction heating roller device in a modified embodiment. Figure 4 This is a cross-sectional view schematically illustrating the structure of an induction heating roller device in a modified embodiment. Figure 5 This is a cross-sectional view schematically illustrating the structure of an induction heating roller device in a modified embodiment. Detailed Implementation

[0017] Hereinafter, one embodiment of the induction heating roller device of this utility model will be described with reference to the accompanying drawings. Furthermore, for ease of understanding, the figures shown below are appropriately omitted or exaggerated schematically depicted. The same reference numerals are used to label the same constituent elements, and descriptions are appropriately omitted.

[0018] (Device structure) The induction heating roller device 100 of this embodiment is used, for example, in continuous heat treatment processes of continuous materials such as plastic film, paper, cloth, non-woven fabric, synthetic fiber, metal foil, etc., or wire (filament) materials.

[0019] Specifically, such as Figure 1 As shown, the induction heating roller device 100 includes a hollow cylindrical roller body 2 supported for rotation and an induction heating mechanism 3 disposed in a stationary state within the hollow portion of the roller body 2.

[0020] The roller body 2 has a cylindrical shell 21 and journals 22 respectively provided at both axial ends of the shell 21.

[0021] The journal 22 has: a cylindrical fitting portion 221 that fits into the inner circumferential surface of the axial end of the housing portion 21; an annular end plate portion 222 that is connected to the open end face of the axial end of the housing portion 21 by fastening bolts (not shown); and a cylindrical drive shaft portion 223 that extends axially outward from the end plate portion 222. The drive shaft portion 223 is rotatably supported on the machine base 51, 52 by means of bearings 41, 42 such as rolling bearings. Moreover, the roller body 2 is configured to rotate using an externally applied driving force, such as that applied by a rotary drive mechanism (not shown) such as an electric motor.

[0022] Furthermore, in the shell portion 21 of the roller body 2, a first jacketed chamber 21x is formed along the long side direction (axial direction) to enclose a gas-liquid two-phase heat medium. Specifically, in the shell portion 21, a plurality of first jacketed chambers 21x are formed at intervals, for example, at equal intervals, throughout the circumference. By utilizing the latent heat movement of the gas-liquid two-phase heat medium enclosed in the first jacketed chambers 21x, the surface temperature of the shell portion 21 along the axial direction is homogenized.

[0023] The induction heating mechanism 3 includes: a cylindrical iron core 31 in the shape of a cylinder; an induction coil 32 wound and mounted on the outer circumference of the cylindrical iron core 31; and support shafts 311 and 312 supporting them. The support shafts 311 and 312 are respectively located at both ends of the cylindrical iron core 31. These support shafts 311 and 312 pass through the interior of the drive shaft portion 223 and are supported by bearings 61 and 62, such as rolling bearings, allowing them to rotate freely relative to the drive shaft portion 223. Thus, the induction heating mechanism 3 remains stationary relative to the fixed sides (machine bases 51 and 52) inside the rotating roller body 2. A lead L1 is connected to the induction coil 32, and an AC power supply E for applying AC voltage is connected to this lead L1 via a power adjustment device 7. The power adjustment device 7 is controlled by a control device (not shown) to bring the temperature of the roller body 2 to the desired temperature.

[0024] According to this induction heating mechanism 3, if an alternating voltage is applied to the induction coil 32, an alternating magnetic flux is generated, which passes through the shell portion 21 of the roller body 2. Due to this passage, an induced current is generated in the shell portion 21, and the shell portion 21 is heated by this induced current.

[0025] (Characteristic structure of roller body 2) Next, refer to Figure 1 and Figure 2 The characteristic structure of roller body 2 is explained. Additionally, in Figure 2 The image shows a partial enlarged view of the left axial end of the roller body 2. The structure of the left axial end is described below, but the structure of the right axial end is the same.

[0026] like Figure 1 and Figure 2 As shown, the fitting portion 221 extends further axially inward than the axial end of the induction coil 32. That is, as... Figure 2 As shown, the top end 221p of the fitting portion 221 is located within the axial forming range H of the induction coil 32.

[0027] Here, as Figure 2 As shown, an annular groove-shaped fitting recess 21M is formed on the inner circumferential surface of the axial end of the shell portion 21 for fitting the fitting portion 221. Thus, by fitting the fitting portion 221 into the fitting recess 21M, the portion of the shell portion 21 that is further axially inward than the fitting portion 221 becomes a structure that protrudes radially inward more than the fitting surface 21a into which the fitting portion 221 is fitted.

[0028] In this embodiment, the radial depth of the fitting recess 21M is approximately the same as the wall thickness of the top end portion 221p of the fitting portion 221. By fitting the fitting portion 221 into the fitting recess 21M, the inner peripheral surface 221a of the top end portion 221p of the fitting portion 221 is on the same plane or substantially on the same plane as the inner peripheral surface 21b of the shell portion 21, which is further inward than the fitting recess 21M. That is, the diameter of the inner peripheral surface 221a of the top end portion 221p is the same as or substantially the same as the diameter of the inner peripheral surface 21b of the shell portion 21. With this structure, even if the fitting portion 221 is configured to extend further inward than the axial end of the induction coil 32, the distance between the outer peripheral surface of the induction coil 32 and the inner peripheral surface 21b of the shell portion 21 can be reduced. As a result, magnetic coupling can be improved, enabling high power factor heating of the shell portion 21.

[0029] In addition, such as Figure 1 and Figure 2 As shown, the fitting portion 221 is provided on the axial inner surface of the end plate portion 222. Furthermore, as... Figure 2 As shown, the base end portion 221q of the fitting portion 221 has a structure with a thicker wall extending radially inward than the top end portion 221p. Therefore, even with the second jacket chamber 221x formed in the fitting portion 221, the mechanical strength of the fitting portion 221 when fitted into the shell portion 21 can be ensured. Furthermore, when the fitting portion 221 is fitted into the shell portion 21, the end plate portion 222 is connected to the open end face 21e of the axial end of the shell portion 21 by a fastening bolt (not shown).

[0030] In this embodiment, the induction coil 32 has the same outer diameter from one end in the axial direction to the other end in the axial direction. Therefore, the distance between the outer peripheral surface of the induction coil 32 and the inner peripheral surface 221a of the fitting portion 221, and the distance between the outer peripheral surface of the induction coil 32 and the inner peripheral surface 21b of the shell portion 21 are the same or substantially the same.

[0031] In addition, such as Figure 1 and Figure 2 As shown, within the wall thickness of the fitting portion 221, a second jacketed chamber 221x containing a gas-liquid two-phase heat medium is formed along the axial direction. Specifically, a plurality of second jacketed chambers 221x are formed in the fitting portion 221 at circumferential intervals, for example, at equal intervals. By utilizing the latent heat movement of the gas-liquid two-phase heat medium sealed in the second jacketed chambers 221x, the temperature in the axial direction of the fitting portion 221 is homogenized.

[0032] Furthermore, the second jacket chamber 221x extends axially inward more than the axial end of the first jacket chamber 21x formed in the shell portion 21. That is, as Figure 2As shown, the axial forming range L of the first jacket chamber 21x in the shell 21 and the axial forming range K of the second jacket chamber 221x in the fitting portion 221 overlap with each other in the axial direction.

[0033] Furthermore, such as Figure 1 and Figure 2 As shown, a third jacketed chamber 222x containing a gas-liquid two-phase heat medium is formed radially within the wall thickness of the end plate portion 222. Specifically, a plurality of third jacketed chambers 222x are formed circumferentially spaced apart, for example radially, in the end plate portion 222. By utilizing the latent heat movement of the gas-liquid two-phase heat medium sealed in the third jacketed chambers 222x, the temperature in the radial direction of the end plate portion 222 is homogenized. In this embodiment, the third jacketed chamber 222x is configured to communicate with the second jacketed chamber 221x, allowing the heat medium to travel between these jacketed chambers 221x and 222x. Alternatively, the third jacketed chamber 222x may be an independent jacketed chamber separate from the second jacketed chamber 221x.

[0034] Based on this, such as Figure 1 and Figure 2 As shown, a fourth jacketed chamber 223x containing a gas-liquid two-phase heat medium is formed axially within the wall thickness of the drive shaft portion 223. Specifically, multiple fourth jacketed chambers 223x are formed circumferentially at intervals, for example, at equal intervals, in the drive shaft portion 223. By utilizing the latent heat movement of the gas-liquid two-phase heat medium sealed in the fourth jacketed chambers 223x, the temperature in the axial direction of the drive shaft portion 223 is homogenized. In this embodiment, the fourth jacketed chamber 223x is configured to communicate with the third jacketed chamber 222x, allowing the heat medium to circulate between these jacketed chambers 222x and 223x. Alternatively, the fourth jacketed chamber 223x may be an independent jacketed chamber separate from the third jacketed chamber 222x.

[0035] In this structure, according to the induction heating mechanism 3, if an alternating voltage is applied to the induction coil 32, an alternating magnetic flux is generated, which passes through the fitting portion 221 of the journal 22. This flux induces a current in the fitting portion 221, which then generates Joule heating. Furthermore, the heat generated in the fitting portion 221 is distributed throughout the entire fitting portion 221 via the second jacket chamber 221x. Additionally, the heat transferred from the fitting portion 221 to the end plate portion 222 is distributed throughout the entire end plate portion 222 via the third jacket chamber 222x. Finally, the heat transferred from the end plate portion 222 to the drive shaft portion 223 is distributed throughout the entire drive shaft portion 223 via the fourth jacket chamber 223x.

[0036] (Effects of this implementation method) In the induction heating roller device 100 configured in this way, since the fitting portion 221 of the journal 22 extends further axially inward than the axial end of the induction coil 32, and a second jacket chamber 221x is formed axially within the wall thickness of the fitting portion 221, the fitting portion 221 is inductively heated by the induction coil 32, and the axial temperature of the fitting portion 221 can be stabilized rapidly. As a result, the temperature drop at the axial end of the shell portion 21 can be suppressed, and the axial surface temperature distribution of the shell portion 21 can be stabilized more quickly.

[0037] Furthermore, the first jacket chamber 21x is formed along the axial direction within the wall thickness of the shell portion 21, and combined with the structure in which the second jacket chamber 221x is provided in the fitting portion 221, the axial surface temperature of the shell portion 21 of the roller body 2 can be quickly stabilized.

[0038] Furthermore, by suppressing the temperature drop at the axial end of the shell 21, it is not necessary to extend the ineffective length portion formed at the axial end of the shell 21, thus expanding the effective length portion in the shell 21 that is in contact with the heated object (reducing the ineffective length portion).

[0039] Furthermore, by suppressing the temperature drop at the axial end of the shell 21, the reduction in diameter at the axial end of the shell 21 compared to the axial center can be eliminated.

[0040] (Other variations and implementations) Furthermore, this utility model is not limited to the embodiments described above.

[0041] For example Figure 3 As shown, the induction coil 32 can also be configured to be divided in the axial direction, having an induction coil 32A for the housing portion 21 that induces heating and an induction coil 32B for the fitting portion 221 that induces heating. With this structure, the induction heating of the housing portion 21 and the induction heating of the fitting portion 221 can be controlled independently. By controlling the induction heating of the fitting portion 221 independently, the effect of heating the fitting portion 221 (suppressing the temperature drop at the axial end of the housing portion 21) can be maximized.

[0042] Here, it is advisable to make the induction coil 32A for the housing and the induction coil 32B for the fitting part have the same or substantially the same outer diameter. Furthermore, the axial center of the induction coil 32B for the fitting part can also be configured to be located axially outwards than the tip 221p of the fitting part 221. With this structure, the heat energy generated by the induction coil 32B for the fitting part can be effectively used for heating the fitting part 221.

[0043] In addition, the induction heating roller device 100 may also include: a temperature sensor 8 for detecting the temperature of the journal 22; and a control device 9 for controlling the power supply to the induction coil 32B of the fitting part based on the temperature detected by the temperature sensor 8. Figure 3 The temperature sensor 8 is located inside the second jacket chamber 221x, but it can also be located outside the second jacket chamber 221x as long as it can detect the temperature of the journal 22. The control device 9 controls the power supply to the induction coil 32B for the fitting part by controlling the power adjustment device 72, which adjusts the power supplied to the induction coil 32B for the fitting part. In addition, the power adjustment device 71 adjusts the power supplied to the induction coil 32A for the shell part, which is controlled by the control device 9. With this structure, the journal 22 can be controlled at any temperature, and the axial surface temperature of the shell part 21 of the roller body 2 can be quickly stabilized.

[0044] In the described embodiment, the journal 22 is configured to have a second jacket chamber 221x, a third jacket chamber 222x, and a fourth jacket chamber 223x, but as... Figure 4 As shown, it is permissible to configure it to have at least one of the jacketed chambers 221x, or it may be configured to not have at least one of the third jacketed chamber 222x and the fourth jacketed chamber 223x. Furthermore, in Figure 4 The diagram shows a structure that does not have a fourth jacketed chamber 223x.

[0045] Furthermore, in the above embodiment, the inner peripheral surface 221a of the top end portion 221p of the fitting portion 221 is on the same plane or substantially on the same plane as the inner peripheral surface 21b of the shell portion 21. However, the inner peripheral surface 21b of the shell portion 21 may be located further outward or further inward than the inner peripheral surface 221a of the fitting portion 221.

[0046] Furthermore, in the embodiment described above, the second jacket chamber 221x extends axially inward more than the axial end of the first jacket chamber 21x, but it may not extend axially inward more than the axial end of the first jacket chamber 21x.

[0047] Furthermore, at least one of the first jacket chamber 21x, the second jacket chamber 221x, the third jacket chamber 222x, and the fourth jacket chamber 223x can also be connected in the circumferential direction. By connecting in the circumferential direction, temperature homogenization can be achieved not only in the axial direction but also in the circumferential direction.

[0048] In addition, it can also be like Figure 5As shown, in the shell portion 21, a fifth jacketed chamber 21y is formed along the axial direction in the wall thickness portion (the portion protruding radially inward from the fitting surface 21a) that contains a gas-liquid two-phase heat medium. The latent heat movement of the gas-liquid two-phase heat medium within the fifth jacketed chamber 21y is utilized to homogenize the temperature along the axial direction of the wall thickness portion. Alternatively, in addition to forming both the first jacketed chamber 21x and the fifth jacketed chamber 21y, it is also possible to configure the structure to form only the fifth jacketed chamber 21y.

[0049] In addition, this utility model is not limited to the described embodiments, and various modifications can be made without departing from its spirit. Explanation of reference numerals in the attached figures

[0050] 100 Induction Heating Roller Device 2 Roller Body 21 Shell 22 journals 221 Chimeric part 222 End plate section 223 Drive shaft section 21x First Jacket Chamber 221x Second Jacket Chamber 222x Third Jacket Chamber 223x Fourth Jacketed Chamber 21M fitting recess 32A Induction coil for housing 32B Induction coil for mating part 8 Temperature Sensor 9. Control device.

Claims

1. An induction heating roller device, characterized in that, include: The hollow roller body is supported to allow rotation; as well as The induction heating mechanism, disposed within the hollow portion of the roller body, includes an induction coil. The roller body has a cylindrical shell and journals respectively disposed at both axial ends of the shell. The journal has: a cylindrical fitting portion that fits into the inner circumferential surface of the axial end of the housing portion; an annular end plate portion that engages with the open end face of the axial end of the housing portion; and a cylindrical drive shaft portion that extends axially outward from the end plate portion. The fitting portion extends axially inward beyond the axial end of the induction coil. A first jacketed chamber containing a heat medium is formed axially within the wall thickness of the shell portion. A second jacketed chamber containing a heat medium is formed along the axial direction within the wall thickness of the fitting portion.

2. The induction heating roller device according to claim 1, characterized in that, The second jacket chamber extends further axially inward than the axial end of the first jacket chamber.

3. The induction heating roller device according to claim 1 or 2, characterized in that, A third jacketed chamber containing a heat medium is formed radially within the wall thickness of the end plate portion.

4. The induction heating roller device according to claim 3, characterized in that, A fourth jacketed chamber containing a heat medium is formed axially within the wall thickness of the drive shaft portion.

5. The induction heating roller device according to claim 1 or 2, characterized in that, An annular groove-shaped fitting recess is formed on the inner circumferential surface of the axial end of the shell for the fitting part to fit into.

6. The induction heating roller device according to claim 1 or 2, characterized in that, The induction coil is divided in the axial direction and has an induction coil for the shell portion that causes the shell portion to generate heat, and an induction coil for the fitting portion that causes the fitting portion to generate heat.

7. The induction heating roller device according to claim 6, characterized in that, include: A temperature sensor is used to detect the temperature of the journal. as well as The control device controls the power supply to the induction coil of the fitting part based on the temperature detected by the temperature sensor.

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