Induction heating roll and spinning and drawing device

Abstract

The present invention relates to an induction heating roll and a spinning and drawing device. In the induction heating roll, while suppressing a reduction in the strength of the roll body, the temperature distribution in the axial direction on the roll surface is made uniform. The induction heating roll (30) includes: a roll body (31) having a cylindrical outer cylinder portion (33) and an end face portion (35) connected to an end portion on one axial end side of the outer cylinder portion (33); and a heater (40) having a coil (41) disposed inside the roll body (31), and by supplying an alternating current to the coil (41), the outer cylinder portion (33) is inductively heated. Among them, in the inner surface of the end face portion (35), in a region radially between the outer cylinder portion (33) and the heater (40), a groove portion (35a) extending along the circumferential direction is provided.

Description

[0001] This application is a divisional application of an application with the application number 201880064711.1, the filing date of September 5, 2018, and the invention title of "Induction Heating Roll and Spinning and Drawing Device". Technical Field

[0002] The present invention relates to an induction heating roll and a spinning and drawing device including the induction heating roll. Background Art

[0003] For example, in the induction heating roll described in Patent Document 1, a heater having a coil is disposed inside a roll body formed of a magnetic material, and by supplying an alternating current to the coil, the outer cylindrical portion (heated portion) of the roll body is induction heated. Specifically, a front cover (hereinafter referred to as an end face portion) is connected to an end portion on one end side in the axial direction of the outer cylindrical portion, and a yoke is disposed adjacent to the other end side in the axial direction of the outer cylindrical portion. And when an alternating current is supplied to the coil, an alternating magnetic flux is generated that circulates around the iron core of the heater, the end face portion, the outer cylindrical portion, and the yoke. Then, eddy currents flowing circumferentially are generated in the outer cylindrical portion by electromagnetic induction, and the outer cylindrical portion is heated by the Joule heat thereof.

[0004] Prior Art Documents

[0005] Patent Documents

[0006] Patent Document 1: Japanese Patent Laid-Open No. 54-106617 Summary of the Invention

[0007] Problems to be Solved by the Invention

[0008] Here, since the magnetic flux has the property of passing through the shortest path, the magnetic flux mainly passes through the inside of the corner between the outer cylindrical portion and the end face portion. Thus, when the end face portion has a certain thickness, the magnetic flux hardly passes through the end face portion and the one end side of the outer cylindrical portion, and the one end portion of the roll body cannot be sufficiently heated. As a result, there is a problem that the temperature distribution in the axial direction of the outer peripheral surface (roll surface) of the roll body becomes uneven. On the other hand, if the thickness of the end face portion is reduced, the magnetic flux passes through the end face portion and the one end side of the outer cylindrical portion, and the heat generation at the one end portion of the roll body can be promoted, so the temperature distribution of the roll surface is improved. However, in this case, there is a problem that the rigidity of the end face portion becomes low and the strength of the roll body is reduced.

[0009] In view of the above problems, an object of the induction heating roll of the present invention is to suppress a reduction in the strength of the roll body and to uniformize the temperature distribution in the axial direction of the roll surface.

[0010] Means for Solving the Problems

[0011] The induction heating roll of the present invention includes: a roll body having a cylindrical heated portion and an end face portion connected to an end portion on one axial end side of the heated portion; and a heater having a coil disposed inside the roll body, wherein the heated portion is induction heated by supplying an alternating current to the coil. The induction heating roll is characterized in that, in the inner surface of the end face portion, in a region between the heated portion and the heater in the radial direction, a groove portion extending in the circumferential direction is formed.

[0012] According to the present invention, the magnetic flux passing through the end face portion bypasses the groove portion and turns to one axial end side. Thus, heat generation at one end portion of the roll body can be promoted, and the temperature distribution in the axial direction on the roll surface can be improved. In addition, since the groove portion is formed only in a part of the inner surface of the end face portion, the rigidity of the end face portion is not significantly reduced. In this way, according to the present invention, while suppressing a reduction in the strength of the roll body, the temperature distribution in the axial direction on the roll surface can be made uniform.

[0013] In the present invention, it is possible that the groove portion has an annular structure formed over the entire circumference in the circumferential direction.

[0014] By making the groove portion have an annular structure, heat generation at one end portion of the roll body can be promoted over the entire circumference in the circumferential direction, and thus the temperature distribution in the axial direction on the roll surface can be effectively made uniform.

[0015] In the present invention, it is possible that the groove portion is formed adjacent to the heated portion.

[0016] When the groove portion is adjacent to the heated portion, the magnetic flux that bypasses the groove portion and turns to one end side also passes through one end portion of the heated portion. Thus, heat generation at one end portion of the heated portion can be promoted, and the temperature distribution in the axial direction on the roll surface can be made more effectively uniform.

[0017] In the present invention, it is possible that the groove portion is formed only in the inner surface of the end face portion, in a region between the heated portion and the heater in the radial direction.

[0018] By limiting the range where the groove portion is formed to the region between the heated portion and the heater, the reduction in the rigidity of the end face portion can be suppressed, and further, the reduction in the strength of the roll body can be suppressed.

[0019] In the present invention, it is possible that the groove portion becomes deepest at the outermost side in the radial direction.

[0020] Thus, by varying the depth of the groove portion, the volume of the groove portion can be reduced, the reduction in the rigidity of the end face portion can be suppressed, and further the reduction in the strength of the roll body can be suppressed. Moreover, since the groove portion becomes deepest at the outermost side in the radial direction, the magnetic flux that wraps around to one end side at the deepest part of the groove portion easily passes through one end portion of the heated portion. Therefore, the heat generation at one end portion of the heated portion can be promoted, and the temperature distribution in the axial direction on the roll surface can be made uniform more effectively.

[0021] In the present invention, it is possible that the thickness of the portion in the end face portion where the groove portion is not formed is greater than the thickness of the heated portion.

[0022] Thus, the rigidity of the end face portion can be increased, and the strength of the roll body can be increased.

[0023] In the present invention, it is possible that the minimum thickness of the portion in the end face portion where the groove portion is formed is less than the thickness of the heated portion.

[0024] Thus, the magnetic flux passing through the deepest part of the groove portion (the portion where the thickness of the end face portion is minimum) passes through more on the one end side. Therefore, the heat generation at one end portion of the roll body can be further promoted, and the temperature distribution in the axial direction on the roll surface can be made uniform more effectively.

[0025] In the present invention, it is possible that the minimum thickness of the portion in the end face portion where the groove portion is formed is 3 mm or more.

[0026] Thus, magnetic flux saturation can be avoided at the portion where the thickness of the end face portion becomes minimum, and a reduction in the heating efficiency of induction heating can be suppressed.

[0027] In the present invention, it is possible that the groove portion is filled with a non-magnetic member.

[0028] Thus, compared with the case where the groove portion only becomes a space, the rigidity of the end face portion can be increased, and the strength of the roll body can be increased.

[0029] In the present invention, it is possible that a non-magnetic heat equalizing member is further provided, and the heat equalizing member is arranged in contact with the inner peripheral surface of the heated portion, and the thermal conductivity in the axial direction is higher than the thermal conductivity of at least the inner peripheral surface of the heated portion, and a part of the heat equalizing member is inserted into the groove portion as the non-magnetic member.

[0030] By providing such a heat equalizing member, the temperature distribution in the axial direction on the roll surface can be made uniform more effectively. Moreover, since the groove portion can be strengthened by using the heat equalizing member, it is more preferable.

[0031] In the present invention, it is possible that the heat equalizing member is formed of a fiber composite material.

[0032] In the case of a fiber composite material, by studying the orientation of the fibers, physical properties such as thermal conductivity and resistivity can be made anisotropic, which is convenient for use as a material for a heat sink component.

[0033] In the present invention, it can be that the heat sink component is formed of a non-magnetic metal material, and the thermal conductivity of the metal material is higher than the thermal conductivity of at least the inner peripheral surface of the heated portion.

[0034] Generally, a metal material is easier to process than a fiber composite material. Therefore, if the heat sink component is made of a metal material, the molding of the heat sink component becomes easy.

[0035] In the present invention, it can be that the other end side end portion in the axial direction of the roll body is cantilever supported.

[0036] When the other end side end portion of the roll body is cantilever supported, one end portion of the roll body becomes a free end exposed to the external gas, and the temperature of the roll surface is particularly likely to decrease. Therefore, the present invention capable of promoting heat generation at one end portion of the roll body is particularly effective.

[0037] The spinning and drawing device of the present invention is provided with the induction heating roll according to any one of the above, and is characterized in that a plurality of silk threads are wound around the outer peripheral surface of the roll body along the axial direction.

[0038] According to the present invention, it is possible to make the temperature distribution in the axial direction of the roll surface uniform. Therefore, it is possible to uniformly heat a plurality of silk threads wound around the roll body, suppress variations in the quality of the plurality of silk threads, and improve the quality of the silk threads. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic view showing a spinning and drawing machine equipped with the induction heating roll of the present embodiment.

[0040] Figure 2 It is a cross-sectional view along the axial direction of the induction heating roll of the present embodiment.

[0041] Figure 3 It is a table showing the physical properties of the roll body and the heat sink component of the present embodiment.

[0042] Figure 4 It is a chart showing a partially enlarged cross-sectional view of the induction heating roll of the present embodiment and the temperature distribution on the roll surface.

[0043] Figure 5 It is a cross-sectional view showing a modified example of the induction heating roll.

[0044] Figure 6 It is a cross-sectional view showing a modified example of the induction heating roll.

[0045] Figure 7 It is a cross-sectional view showing a modified example of the induction heating roller.

[0046] Figure 8 This is a graph showing a partially enlarged cross-sectional view of a conventional induction heating roller and temperature distribution on the roller surface. DETAILED DESCRIPTION

[0047] (Spinning traction machine)

[0048] Embodiments of the present invention will be described. Figure 1 Schematic diagram of a spinning traction machine equipped with an induction heating roller according to this embodiment. Figure 1 As shown, the spinning traction machine 1 is configured to wind up a plurality of (here, six) yarns Y formed by solidifying a molten fiber material such as polyester, which are continuously spun from a spinning device 2, by a spinning stretching device 3, after being stretched by the yarn winding device 4. In addition, in the following description, reference is made to the directions added to the respective figures.

[0049] The spinning device 2 continuously spins a molten fiber material such as polyester to produce a plurality of yarns Y. The plurality of yarns Y spun from the spinning device 2 are provided with oil by an oil guide 10 and then conveyed to the spinning and drawing device 3 via a guide roller 11 .

[0050] The spinning and stretching device 3 is a device for heating and stretching a plurality of yarns Y, and is arranged below the spinning device 2. The spinning and stretching device 3 has a plurality of (here, 5) godet rollers 21 to 25 housed inside the heat preservation box 12. Each godet roller 21 to 25 is an induction heating roller that is driven by a motor and induction heated by energizing the coil, and is wound with a plurality of yarns Y. An inlet 12a for introducing a plurality of yarns Y into the heat preservation box 12 is formed at the lower part of the right side surface of the heat preservation box 12, and an outlet 12b for leading a plurality of yarns Y out of the heat preservation box 12 is formed at the upper part of the right side surface of the heat preservation box 12. The plurality of yarns Y are wound with respect to each godet roller 21 to 25 in sequence from the lower godet roller 21 at a winding angle less than 360 degrees.

[0051] The three lower godet rollers 21 to 23 are preheating rollers for preheating the plurality of wires Y before stretching, and the roller surface temperature of these rollers is set to a temperature above the glass transition point of the wires Y (e.g., about 90 to 100°C). On the other hand, the two upper godet rollers 24 and 25 are tempering rollers for heat-setting the plurality of wires Y after stretching, and the roller surface temperature of these rollers is set to a temperature higher than the roller surface temperature of the three lower godet rollers 21 to 23 (e.g., about 150 to 200°C). In addition, the wire feeding speed of the two upper godet rollers 24 and 25 is faster than the wire feeding speed of the three lower godet rollers 21 to 23.

[0052] A plurality of filaments Y introduced into the heat-insulating box 12 through the introduction port 12a are first preheated to a temperature at which they can be stretched during the conveyance by the guide rollers 21 to 23. The plurality of preheated filaments Y are stretched by the difference in the wire feeding speed between the guide roller 23 and the guide roller 24. Further, the plurality of filaments Y are heated to a higher temperature during the conveyance by the guide rollers 24 and 25, and the stretched state is heat-set. The plurality of filaments Y stretched in this way are led out of the heat-insulating box 12 through the lead-out port 12b.

[0053] The plurality of filaments Y stretched by the spinning and stretching device 3 are conveyed to the filament winding device 4 through the guide roller 13. The filament winding device 4 is a device for winding the plurality of filaments Y and is disposed below the spinning and stretching device 3. The filament winding device 4 includes a bobbin holder 14, a contact roller 15, etc. The bobbin holder 14 has a cylindrical shape extending in the front-rear direction and is rotationally driven by a motor (not shown). A plurality of bobbins B are mounted on the bobbin holder 14 in a state of being arranged along its axial direction. The filament winding device 4 rotates the bobbin holder 14, thereby winding the plurality of filaments Y onto the plurality of bobbins B simultaneously to produce a plurality of packages P. The contact roller 15 contacts the surfaces of the plurality of packages P to apply a predetermined contact pressure and adjusts the shape of the package P.

[0054] (Induction heating roller)

[0055] Next, Figure 2 The configuration of the induction heating roller 30 applied to the guide rollers 21 to 25 will be described. Figure 2 is a cross-sectional view along the axial direction of the induction heating roller 30 of the present embodiment. The roller body 31 of the induction heating roller 30 is cantilever-supported by a motor 100 that rotationally drives the roller body 31. Hereinafter, the direction in which the cylindrical roller body 31 extends ( Figure 2 the left-right direction) is referred to as the axial direction. In the axial direction, the front end side of the roller body 31 ( Figure 2 the right side) corresponds to one end side of the present invention, and the opposite base end side ( Figure 2 the left side) corresponds to the other end side of the present invention. In addition, the radial direction of the roller body 31 is appropriately abbreviated as the radial direction, and the circumferential direction of the roller body 31 is appropriately abbreviated as the circumferential direction.

[0056] The induction heating roller 30 has a cylindrical roller body 31 extending along the axial direction and a heater 40 that raises the temperature of the outer peripheral surface of the roller body 31 (hereinafter referred to as the roller surface 31a). The induction heating roller 30 raises the temperature of the roller surface 31a by induction heating of the coil 41 provided in the heater 40. As a result, the plurality of filaments Y wound around the roller surface 31a in a state of being arranged along the axial direction are heated.

[0057] The roller main body 31 is formed of carbon steel which is both a magnetic material and a conductor. The roller main body 31 is integrally formed with: a cylindrical outer cylinder portion 33 located radially outside the coil 41; a cylindrical shaft center portion 34 located radially inside the coil 41; and a disc-shaped end face portion 35 that connects the front end portion of the outer cylinder portion 33 and the front end portion of the shaft center portion 34. However, if the outer cylinder portion 33 and the end face portion 35 are magnetic materials and conductors, the outer cylinder portion 33 and the end face portion 35 may also be made of different materials. In addition, even when the outer cylinder portion 33 and the end face portion 35 are made of the same material, the outer cylinder portion 33 and the end face portion 35 may be made into different components. The base end side of the roller main body 31 is open, and the output shaft 101 of the motor 100 is inserted into the inside of the roller main body 31 from this opening.

[0058] An axial mounting hole 34a extending along the axial direction is formed in the shaft center portion 34 of the roller main body 31. The output shaft 101 of the motor 100 inserted from the base end side is fixed to the axial mounting hole 34a by a fixing mechanism (not shown). Thereby, the base end portion of the roller main body 31 is cantilever supported by the output shaft 101 of the motor 100, and the roller main body 31 can rotate integrally with the output shaft 101.

[0059] In the present embodiment, in order to effectively heat up the roller surface 31a, the thickness of the outer cylinder portion 33 is reduced to about 6 to 8 mm to a certain extent. On the other hand, when the thickness of the end face portion 35 is set to be the same as that of the outer cylinder portion 33, the strength of the roller main body 31 may be insufficient. Therefore, the thickness of the end face portion 35 is increased to about 8 to 10 mm compared to the outer cylinder portion 33. However, the thickness shown here is only an example, and the thickness of the outer cylinder portion 33 can also be set to be the same as or greater than that of the end face portion 35.

[0060] A cylindrical heat dissipation member 36 is disposed inside the roller main body 31 so as to be in contact with the inner circumferential surface of the outer cylinder portion 33. The heat dissipation member 36 is formed of, for example, a C / C composite material (carbon fiber reinforced carbon composite material) containing carbon fiber and graphite. Figure 3 is a table showing the physical properties of the roller main body 31 and the heat dissipation member 36 of the present embodiment. In the C / C composite material used for the heat dissipation member 36, the carbon fibers are axially oriented or randomly oriented. Therefore, as Figure 3 shown, the thermal conductivity in the axial direction of the heat dissipation member 36 is higher than the thermal conductivity of the roller main body 31 (at least the inner circumferential surface of the outer cylinder portion 33), and the temperature distribution in the axial direction of the roller surface 31a can be made uniform by the heat dissipation member 36. In addition, the resistivity in the circumferential direction of the heat dissipation member 36 is greater than the resistivity of the outer cylinder portion 33. Therefore, eddy currents hardly flow in the heat dissipation member 36. Furthermore, since the C / C composite material is a non-magnetic material, almost no magnetic flux passes through the heat dissipation member 36, and induction heating of the heat dissipation member 36 can be suppressed.

[0061] Return to Figure 2 The outer diameter of the soaking member 36 is substantially the same as the inner diameter of the outer cylinder portion 33, and the outer peripheral surface of the soaking member 36 is in contact with the inner peripheral surface of the outer cylinder portion 33 over substantially the entire surface. The axial length of the soaking member 36 is substantially the same as the length of the outer cylinder portion 33 of the roll body 31. The front end portion of the soaking member 36 is inserted into a groove portion 35a described later, and the base end portion of the soaking member 36 is fixed to the base end portion of the outer cylinder portion 33 by an annular fixing ring 37. The fixing ring 37 is formed of a magnetic material such as carbon steel, for example.

[0062] A flange 38 is disposed on the base end side of the roll body 31. The flange 38 is a magnetic material and is formed of, for example, the same carbon steel as the roll body 31. The flange 38 is a disc-shaped member, and a through hole 38a for inserting the output shaft 101 of the motor 100 is formed in the center portion thereof. The flange 38 extends to a position radially outside the coil 41, and an annular groove 38b is formed on the inner surface of the peripheral portion. The above-described fixing ring 37 is disposed in the annular groove 38b so as not to contact the formation surface of the annular groove 38b.

[0063] Next, the heater 40 will be described. The heater 40 includes a coil 41 and a bobbin member 42. The coil 41 is used to inductively heat the roll body 31. The coil 41 is wound around a cylindrical bobbin member 42 and is radially disposed inside the outer cylinder portion 33 of the roll body 31 and outside the shaft center portion 34.

[0064] The bobbin member 42 is formed of, for example, the same carbon steel as the roll body 31. The bobbin member 42 has a cylindrical iron core portion 42a around which the coil 41 is wound and a flange portion 42b that projects radially outward from the front end portion of the iron core portion 42a. The front end portion of the bobbin member 42 is slightly separated from the end face portion 35, and the base end portion of the bobbin member 42 is attached to the flange 38. Although not shown, the bobbin member 42 has a C-shaped cross-sectional shape in which a part in the circumferential direction is cut off. Therefore, eddy currents hardly flow in the bobbin member 42, and the bobbin member 42 can be suppressed from being inductively heated.

[0065] Figure 4 is a diagram showing a partial enlarged cross-sectional view of the induction heating roll 30 of the present embodiment and the temperature distribution on the roll surface. When a high-frequency current is supplied to the coil 41, a changing magnetic field is generated around the coil 41. Then, eddy currents flowing circumferentially are generated in the outer cylinder portion 33 of the roll body 31 by electromagnetic induction, and the outer cylinder portion 33 is heated by the Joule heat thereof, and the temperature of the roll surface 31a rises. At this time, as Figure 4As shown by the arrow in [the figure], a magnetic flux path is formed that passes through the iron core portion 42a of the bobbin member 42, the flange portion 42b of the bobbin member 42, the end face portion 35 of the roller main body 31, the outer cylinder portion 33 of the roller main body 31, the fixing ring 37, and the flange 38. Additionally, the orientation of the magnetic flux changes according to the orientation of the current.

[0066] (Problems of the prior art)

[0067] Figure 8 It is a diagram showing a partially enlarged cross-sectional view of a conventional induction heating roller 90 and the temperature distribution of the roller surface 31a. The same reference numerals are given to the components common to the induction heating roller 30 of the present embodiment.

[0068] Since the magnetic flux has the property of passing through the shortest path, the magnetic flux mainly passes through the inside of the corner between the outer cylinder portion 33 and the end face portion 35. Therefore, when the end face portion 35 has a certain thickness, the magnetic flux hardly passes through the front end portion of the outer cylinder portion 33 (refer to Figure 8 the dashed line portion), and the front end portion of the outer cylinder portion 33 cannot be sufficiently heated. As a result, the temperature of the roller surface 31a drops sharply at the front end portion, and the temperature distribution in the axial direction becomes uneven. In particular, this problem is more significant when the roller main body 31 is cantilever-supported by the motor 100 and the front end portion of the roller main body 31 is exposed to the external gas.

[0069] On the other hand, if the thickness of the end face portion 35 is reduced, the magnetic flux also passes through the front end portion of the outer cylinder portion 33, and the front end portion of the outer cylinder portion 33 can be heated, so the temperature distribution of the roller surface 31a is improved. However, in this case, there is a problem that the rigidity of the end face portion 35 becomes low and the strength of the roller main body 31 decreases.

[0070] (Configuration of the groove portion)

[0071] To solve the above problems, in the present embodiment, as Figure 4 shown, in the inner surface of the end face portion 35 of the roller main body 31, in the radial direction between the outer cylinder portion 33 and the heater 40, more precisely, in a part of the region between the inner peripheral surface of the outer cylinder portion 33 in the radial direction and the radially outer end of the flange portion 42b of the bobbin member 42, a groove portion 35a is formed. The groove portion 35a is formed at a position adjacent to the outer cylinder portion 33 and has an annular structure extending over the entire circumference in the circumferential direction. The front end portion of the heat dissipation member 36 is inserted into the groove portion 35a.

[0072] Although the heat dissipation member 36 is inserted into the groove portion 35a, since the heat dissipation member 36 is a non-magnetic body, the magnetic flux hardly passes through the heat dissipation member 36. That is, the magnetic flux bypasses the groove portion 35a (heat dissipation member 36) and goes around to the front end side of the end face portion 35 and the outer cylinder portion 33 of the roller main body 31 (refer toFigure 4 (the dashed line part). As a result, the heat generation amount at the front end portion of the outer cylinder portion 33 can be increased, and the temperature distribution on the roller surface 31a can be made uniform.

[0073] The groove portion 35a of the present embodiment has a triangular cross-sectional shape orthogonal to the circumferential direction and is a conical shape in which the depth becomes deeper toward the radially outer side. That is, the depth of the groove portion 35a becomes the deepest at the radially outermost side, and the magnetic flux that wraps around to the front end side in the groove portion 35a easily passes through the front end portion of the outer cylinder portion 33. Therefore, the front end portion of the outer cylinder portion 33 can be effectively heated. In addition, the minimum thickness of the portion of the end face portion 35 in which the groove portion 35a is formed (the thickness at the portion where the groove portion 35a is the deepest) is, for example, about 3 to 5 mm, which is smaller than the thickness of the outer cylinder portion 33 (about 6 to 8 mm). The smaller the minimum thickness, the more the magnetic flux passes through the front end side, but when the minimum thickness is too small, the magnetic flux saturates and the heating efficiency decreases. Therefore, the minimum thickness is preferably 3 mm or more.

[0074] (Effect)

[0075] In the induction heating roller 30 of the present embodiment, a groove portion 35a extending in the circumferential direction is formed in a region between the outer cylinder portion 33 (corresponding to the heated portion of the present invention) and the heater 40 in the radial direction on the inner surface of the end face portion 35 of the roller body 31. According to such a configuration, the magnetic flux passing through the end face portion 35 bypasses to the front end side (one end side) in the axial direction so as to avoid the groove portion 35a. Therefore, the heat generation at the front end portion of the roller body 31 can be promoted, and the temperature distribution in the axial direction on the roller surface 31a can be improved. In addition, since the groove portion 35a is formed only in a part of the inner surface of the end face portion 35, the rigidity of the end face portion 35 does not decrease significantly. Thus, according to the induction heating roller 30 of the present embodiment, the temperature distribution in the axial direction on the roller surface 31a can be made uniform while suppressing the decrease in the strength of the roller body 31.

[0076] In the present embodiment, the groove portion 35a has an annular structure formed over the entire circumference in the circumferential direction. By making the groove portion 35a have an annular structure, the heat generation at the front end portion of the roller body 31 can be promoted over the entire circumference in the circumferential direction, and therefore the temperature distribution in the axial direction on the roller surface 31a can be effectively made uniform.

[0077] In the present embodiment, the groove portion 35a is formed adjacent to the outer cylinder portion 33. When the groove portion 35a is adjacent to the outer cylinder portion 33, the magnetic flux that bypasses to the front end side so as to avoid the groove portion 35a also passes through the front end portion of the outer cylinder portion 33. Therefore, the heat generation at the front end portion of the outer cylinder portion 33 can be promoted, and the temperature distribution in the axial direction on the roller surface 31a can be made more uniform.

[0078] In the present embodiment, the groove portion 35a is formed only in the region between the outer cylindrical portion 33 and the heater 40 in the radial direction on the inner surface of the end face portion 35. Thus, by limiting the range where the groove portion 35a is formed to the region between the outer cylindrical portion 33 and the heater 40, it is possible to suppress a decrease in the rigidity of the end face portion 35, and further suppress a decrease in the strength of the roller body 31.

[0079] In the present embodiment, the groove portion 35a becomes deepest at the outermost side in the radial direction. Thus, by changing the depth of the groove portion 35a, it is possible to reduce the volume of the groove portion 35a, suppress a decrease in the rigidity of the end face portion 35, and further suppress a decrease in the strength of the roller body 31. Moreover, since the groove portion 35a becomes deepest at the outermost side in the radial direction, the magnetic flux that wraps around to the front end side at the deepest part of the groove portion 35a easily passes through the front end portion of the outer cylindrical portion 33. Therefore, it is possible to promote heat generation at the front end portion of the outer cylindrical portion 33 and more effectively equalize the temperature distribution in the axial direction of the roller surface 31a.

[0080] In the present embodiment, the thickness of the portion of the end face portion 35 where the groove portion 35a is not formed is greater than the thickness of the outer cylindrical portion 33. Thus, it is possible to improve the rigidity of the end face portion 35 and the strength of the roller body 31.

[0081] In the present embodiment, the minimum thickness of the portion of the end face portion 35 where the groove portion 35a is formed is less than the thickness of the outer cylindrical portion 33. Thus, the magnetic flux passing through the deepest part of the groove portion 35a (the portion where the thickness of the end face portion 35 is minimum) passes through more on the front end side. Therefore, it is possible to further promote heat generation at the front end portion of the roller body 31 and more effectively equalize the temperature distribution in the axial direction of the roller surface 31a.

[0082] In the present embodiment, the minimum thickness of the portion of the end face portion 35 where the groove portion 35a is formed is 3 mm or more. Thus, it is possible to avoid magnetic flux saturation at the portion where the thickness of the end face portion 35 becomes minimum and suppress a decrease in the heating efficiency of induction heating.

[0083] In the present embodiment, the groove portion 35a is filled with a non-magnetic member 36. Thus, compared with the case where the groove portion 35a only forms a space, it is possible to improve the rigidity of the end face portion 35 and the strength of the roller body 31.

[0084] In the present embodiment, a heat dissipation member 36 made of a non-magnetic material is further provided. The heat dissipation member 36 is disposed in contact with the inner peripheral surface of the outer cylinder portion 33, and has a higher thermal conductivity in the axial direction than at least the inner peripheral surface of the outer cylinder portion 33. A part of the heat dissipation member 36 is inserted into the groove portion 35a as the non-magnetic member. By providing such a heat dissipation member 36, it is possible to more effectively equalize the temperature distribution in the axial direction of the roll surface 31a. Moreover, since the groove portion 35a can be strengthened by using the heat dissipation member 36, it is more preferable.

[0085] In the present embodiment, the heat dissipation member 36 is formed of a fiber composite material. In the case of a fiber composite material, by studying the orientation of the fibers, it is possible to make physical properties such as thermal conductivity and resistivity anisotropic, which is convenient for use as the material of the heat dissipation member 36.

[0086] In the present embodiment, the fiber composite material is a C / C composite material (carbon fiber reinforced carbon composite material) containing carbon fibers and graphite. Among the fiber composite materials containing carbon fibers, the C / C composite material has a high thermal conductivity and high heat resistance. Therefore, by adopting the C / C composite material as the heat dissipation member 36, it is possible to provide the induction heating roll 30 that can more effectively equalize the temperature distribution of the roll surface 31a and can also withstand high temperatures.

[0087] In the present embodiment, the end portion of the roll body 31 on the base end side (the other end side) in the axial direction is cantilever supported. When the roll body 31 is cantilever supported at the base end portion, the front end portion becomes a free end exposed to the external gas, and the temperature of the roll surface 31a is particularly likely to decrease. Therefore, the present invention that can promote heat generation at the front end portion of the roll body 31 is particularly effective.

[0088] In the present embodiment, a plurality of wires Y are wound around the outer peripheral surface of the roll body 31 in the axial direction. According to the present invention, it is possible to equalize the temperature distribution in the axial direction of the roll surface 31a. Therefore, it is possible to uniformly heat the plurality of wires Y wound around the roll body 31, suppress variations in the quality of the plurality of wires Y, and improve the quality of the wires Y.

[0089] (Other embodiments)

[0090] Describe modified examples in which various modifications are made to the above embodiment.

[0091] In the above embodiment, the cross-sectional shape of the groove portion 35a orthogonal to the circumferential direction is triangular. However, the specific shape of the groove portion 35a is not limited thereto. For example, as shown in FIG. a in Figure 5 it may be a groove portion 35b having a rectangular cross-sectional shape, or as shown in Figure 5As shown in Figure b in [ ], it is a groove portion 35c having an arc-shaped cross-sectional shape, and it can also be other shapes.

[0092] In the above-described embodiment, the front end portion of the heat equalizing member 36 is inserted into the groove portion 35a, but this is not necessarily the case. For example, as Figure 6 shown in Figure a in [ ], the heat equalizing member 36 is not inserted into the groove portion 35d, or as Figure 6 shown in Figure b in [ ], the heat equalizing member 36 can be omitted, and a state where no member is inserted into the groove portion 35e is formed. Even just the spaces such as the groove portions 35d and 35e, since the relative magnetic permeability of air is lower than that of the roller body 31 (carbon steel), the magnetic flux passing through the end face portion 35 can also bypass to the front end side in the groove portions 35d and 35e, thereby promoting heat generation at the front end portion of the outer cylinder portion 33. In addition, as Figure 7 shown in Figure a in [ ], the groove portion 35f can be filled with a non-magnetic member 39 that is not a heat equalizing member. The "filling" here is not limited to the case where the entire groove portion 35a is filled with the non-magnetic member, and also includes the case where a part of the groove portion 35a is filled with the non-magnetic member to such an extent that the rigidity of the end face portion 35 can be improved.

[0093] In the above-described embodiment, the groove portion 35a is formed adjacent to the outer cylinder portion 33 of the roller body 31 (formed at the corner between the outer cylinder portion 33 and the end face portion 35). However, it is not necessary for the groove portion to be formed adjacent to the outer cylinder portion 33. For example, as Figure 7 the groove portion 35g shown in Figure b in [ ], as long as it is formed in the region between the outer cylinder portion 33 and the heater 40 in the radial direction, it can also be separated from the outer cylinder portion 33. In this case, by heating the front end portion of the end face portion 35, it is also easy to raise the temperature of the front end portion of the outer cylinder portion 33 through heat conduction from the end face portion 35.

[0094] In the above-described embodiment, the groove portion 35a has an annular structure formed over the entire circumference in the circumferential direction. However, the groove portion does not necessarily need to have an annular structure, and it can be a groove in which a part of the circumferential direction is interrupted, or it can be a groove in which the annular groove structure is divided into a plurality along the circumferential direction.

[0095] In the above-described embodiment, the heat equalizing member 36 is made of a C / C composite material. However, the heat equalizing member 36 can also be made of CFRP (carbon fiber reinforced plastic) containing carbon fiber and resin. Compared with the C / C composite material, CFRP has lower heat resistance but is cheaper. Therefore, when the induction heating roller 30 is not required to have such high heat resistance, by using CFRP as the heat equalizing member 36, the cost can be reduced.

[0096] Furthermore, the soaking member 36 may not be made of a fiber composite material such as C / C composite material or CFRP, but may be made of a non-magnetic metallic material having a thermal conductivity higher than that of at least the inner peripheral surface of the outer cylinder portion 33 (carbon steel), such as aluminum or copper. Generally, metallic materials are easier to process than fiber composite materials. Therefore, if the soaking member 36 is made of a metallic material, the forming of the soaking member 36 becomes easier.

[0097] In the above-described embodiment, the roll body 31 is cantilever-supported. However, the roll body 31 may be supported at both ends.

[0098] In the above-described embodiment, a plurality of filaments Y are wound around the outer peripheral surface of the induction heating roll 30. However, the number of filaments Y wound around the outer peripheral surface of the induction heating roll 30 may be one.

[0099] In the above-described embodiment, the induction heating roll 30 for heating the filament Y is described. However, the use of the induction heating roll 30 is not limited to heating the filament Y, and it can heat sheets such as films, papers, non-woven fabrics, and resin sheets other than the filament Y, and can also heat toner images on sheets provided in copiers and the like.

[0100] Explanation of symbols

[0101] 3: Spinning and drawing device; 30: Induction heating roll; 31: Roll body; 31a: Roll surface; 33: Outer cylinder portion (heated portion); 35: End face portion; 35a to 35g: Groove portions; 36: Soaking member (non-magnetic member); 40: Heater; 41: Coil; Y: Filament.

Claims

1. An induction heating roll, comprising: a roll body having a cylindrical heated portion and an end face portion connected to an end portion on one end side in the axial direction of the heated portion; and a heater having a coil disposed inside the roll body, wherein the heated portion is induction-heated by supplying an alternating current to the coil, wherein the induction heating roll is characterized in that in the inner surface of the end face portion, in a region between the heated portion and the heater in the radial direction, a groove portion extending along the circumferential direction is formed, the induction heating roll further includes a non-magnetic heat equalizing member disposed in contact with the inner peripheral surface of the heated portion, the heat conductivity of the heat equalizing member in the axial direction being higher than at least the heat conductivity of the inner peripheral surface of the heated portion, and the resistivity of the heat equalizing member being greater than the resistivity of the heated portion, the heat equalizing member is formed of a fiber composite material.

2. The induction heating roll according to claim 1, wherein the groove portion has an annular structure formed over the entire circumference in the circumferential direction.

3. The induction heating roll according to claim 1, wherein the groove portion is formed adjacent to the heated portion.

4. The induction heating roll according to claim 2, wherein the groove portion is formed adjacent to the heated portion.

5. The induction heating roll according to claim 1, wherein the groove portion is formed only in the inner surface of the end face portion, in a region between the heated portion and the heater in the radial direction.

6. The induction heating roll according to claim 2, wherein the groove portion is formed only in the inner surface of the end face portion, in a region between the heated portion and the heater in the radial direction.

7. The induction heating roll according to claim 3, wherein the groove portion is formed only in the inner surface of the end face portion, in a region between the heated portion and the heater in the radial direction.

8. The induction heating roll according to claim 4, wherein the groove portion is formed only in the inner surface of the end face portion, in a region between the heated portion and the heater in the radial direction.

9. The induction heating roll according to claim 1, wherein the groove portion becomes deepest at the outermost side in the radial direction.

10. The induction heating roll according to claim 2, wherein the groove portion becomes deepest at the outermost side in the radial direction.

11. The induction heating roll according to claim 3, wherein the groove portion becomes deepest at the outermost side in the radial direction.

12. The induction heating roll according to claim 4, wherein the groove portion becomes deepest at the outermost side in the radial direction.

13. The induction heating roll according to claim 5, wherein the groove portion becomes deepest at the outermost side in the radial direction.

14. The induction heating roll according to claim 6, wherein the groove portion becomes deepest at the outermost side in the radial direction.

15. The induction heating roll according to claim 7, wherein the groove portion becomes deepest at the outermost side in the radial direction.

16. The induction heating roll according to claim 8, wherein the groove portion becomes deepest at the outermost side in the radial direction.

17. The induction heating roll according to any one of claims 1 to 16, wherein the thickness of the portion of the end face portion where the groove portion is not formed is greater than the thickness of the heated portion.

18. The induction heating roll according to any one of claims 1 to 16, wherein the minimum thickness of the portion of the end face portion where the groove portion is formed is less than the thickness of the heated portion.

19. The induction heating roll according to claim 17, wherein the minimum thickness of the portion of the end face portion where the groove portion is formed is less than the thickness of the heated portion.

20. The induction heating roll according to any one of claims 1 to 16, wherein the minimum thickness of the portion of the end face portion where the groove portion is formed is 3 mm or more.

21. The induction heating roll according to any one of claims 1 to 16, wherein the groove portion is filled with a non-magnetic member.

22. The induction heating roll according to claim 17, wherein the groove portion is filled with a non-magnetic member.

23. The induction heating roll according to claim 18, wherein the groove portion is filled with a non-magnetic member.

24. The induction heating roll according to claim 19, wherein the groove portion is filled with a non-magnetic member.

25. The induction heating roll according to claim 20, wherein the groove portion is filled with a non-magnetic member.

26. The induction heating roll according to claim 21, wherein a part of the heat equalizing member is inserted into the groove portion as the non-magnetic member.

27. The induction heating roll according to claim 22, wherein a part of the heat equalizing member is inserted into the groove portion as the non-magnetic member.

28. The induction heating roll according to claim 23, wherein a part of the heat equalizing member is inserted into the groove portion as the non-magnetic member.

29. The induction heating roll according to claim 24, wherein a part of the heat equalizing member is inserted into the groove portion as the non-magnetic member.

30. The induction heating roll according to claim 25, wherein a part of the heat equalizing member is inserted into the groove portion as the non-magnetic member.

31. The induction heating roll according to any one of claims 1 to 16, wherein the end portion on the other end side in the axial direction of the roll body is cantilever supported.

32. The induction heating roll according to claim 17, wherein the end portion on the other end side in the axial direction of the roll body is cantilever supported.

33. The induction heating roll according to claim 18, wherein the end portion on the other end side in the axial direction of the roll body is cantilever supported.

34. The induction heating roll according to claim 19, wherein the end portion on the other end side in the axial direction of the roll body is cantilever supported.

35. The induction heating roll according to claim 20, wherein the end portion on the other end side in the axial direction of the roll body is cantilever supported.

36. A spinning and stretching device, comprising the induction heating roll according to any one of claims 1 to 35, wherein a plurality of silk threads are wound around the outer peripheral surface of the roll body along the axial direction in an array.

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