Heating block and double-belt press

Abstract

To suppress excessive rise in temperature of an exciting coil.SOLUTION: A heating block (20) used for a double-belt press (1) includes an exciting coil (21), a first flow channel formation part (24), and a second flow channel formation part (25). The exciting coil (21) induction-heats a metal belt (13a). The first flow channel formation part (24) and the second flow channel formation part (25) accommodate the exciting coil (21) and form flow channels to move a cooling gas for cooling the exciting coil (21).SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a heating block equipped with an excitation coil for use in a double belt press. [Background technology]

[0002] In Patent Document 1, in a continuous hot press device in which an object to be pressed is heated and pressurized while being sandwiched between endless metal belts from above and below, the metal belt is induction heated using an excitation coil. Here, high-frequency power is supplied to the excitation coil, and the metal belt is heated by the high-frequency magnetic field of the excitation coil. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2014-151349 A Summary of the Invention [Problem to be solved by the invention]

[0004] Depending on the usage conditions of the excitation coil, the temperature of the excitation coil may rise, making it difficult to inductively heat the metal belt. [Means for solving the problem]

[0005] The first invention of the present application is a heating block used in a double belt press, and includes an excitation coil, a first flow path forming portion, and a second flow path forming portion. The excitation coil inductively heats a metal belt. The first flow path forming portion and the second flow path forming portion house the excitation coil and form a flow path for moving a cooling gas for cooling the excitation coil.

[0006] The heating block may be provided with a supply passage for supplying a cooling gas, and the first flow passage forming portion may be provided with an opening for guiding the cooling gas from the supply passage to the flow passage.

[0007] The heating block may be provided with a discharge passage for discharging the cooling gas, and the first flow passage forming portion may be provided with an opening for guiding the cooling gas that has exchanged heat with the excitation coil from the flow passage to the discharge passage.

[0008] The second flow passage forming portion may be provided with an opening for discharging the cooling gas that has exchanged heat with the excitation coil from the flow passage toward the belt surface. The opening may be provided at a position corresponding to both ends in the width direction of the belt.

[0009] At least one of the first flow path forming portion and the second flow path forming portion may be provided with an accommodation groove for accommodating an end of the excitation coil. A guide plate that comes into contact with the belt may be fixed to the second flow path forming portion.

[0010] The second invention of the present application is a double belt press having the heating block of the first invention of the present application. Effect of the Invention

[0011] According to the present invention, by supplying cooling gas to the excitation coil using the flow path formed by the first flow path forming portion and the second flow path forming portion, it is possible to suppress a rise in temperature of the excitation coil. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a schematic diagram showing a configuration of a double belt press. [Diagram 2] FIG. 4 is a diagram showing an arrangement pattern of excitation coils. [Diagram 3] FIG. 2 is a schematic diagram showing the internal structure of a heating block. [Figure 4] FIG. 4 is a view of a first flow path forming part as seen from inside the heating block. [Diagram 5] 4 is a diagram illustrating a flow path of a cooling gas that cools an exciting coil. FIG. [Figure 6] FIG. 4 is a diagram showing an example of a guide plate. [Figure 7] FIG. 11 is a diagram showing another example of a guide plate. [Figure 8] 10 is a diagram for explaining a path of movement of a cooling gas that cools an exciting coil in the first modification. FIG. [Figure 9] 13 is a diagram illustrating a temperature adjustment mechanism for adjusting the temperature of a belt in a second modified example. FIG. [Figure 10] 13 is a diagram illustrating a temperature adjustment mechanism for adjusting the temperature of a belt in a second modified example. FIG. [Figure 11] FIG. 13 is a diagram illustrating a temperature adjustment mechanism for adjusting the temperature of a belt in a third modified example. [Figure 12] FIG. 13 is a diagram illustrating a temperature adjustment mechanism for adjusting the temperature of a belt in a third modified example. [Figure 13] 13 is a diagram illustrating a first modified example of an opening portion of a first flow path forming portion in Modification 4. FIG. [Figure 14] 13 is a diagram illustrating a second modified example of an opening portion of a first flow path forming portion in Modification 4. FIG. [Figure 15] 13 is a diagram illustrating a third modified example of an opening portion of a first flow path forming portion in Modification 4. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] (Double Belt Press Configuration) Fig. 1 is a schematic diagram showing the configuration of a double belt press 1 according to this embodiment. As shown in Fig. 1, a product to be compression molded is supplied to the double belt press 1 (between a pair of belts 13a and 13b, which will be described later), heated and cooled while being compression molded by the double belt press 1, and then discharged from the double belt press 1. Examples of the product include metal composite materials, laminate products (CCL; Copper Clad Laminate), fiber reinforced plastics (CFRP; Carbon Fiber Reinforced Plastics, GFRP; Glass Fiber Reinforced Plastics), functional films, and various boards.

[0014] The double belt press 1 has a pair of entry pulleys 11a, 11b and a pair of exit pulleys 12a, 12b. An endless belt 13a is stretched between the entry pulley 11a and the exit pulley 12a, and an endless belt 13b is stretched between the entry pulley 11b and the exit pulley 12b. The belts 13a, 13b can be made of a metal such as steel. In addition, the tension of the belts 13a, 13b can be adjusted by adjusting the positions of the entry pulleys 11a, 11b.

[0015] A power source (not shown) is connected to the output pulley 12a, and belt 13a can be moved in the direction of arrow D1 by driving output pulley 12a with power from the power source. A power source (not shown) is connected to the output pulley 12b, and belt 13b can be moved in the direction of arrow D2 by driving output pulley 12b with power from the power source. A rotary encoder (not shown) is connected to the input pulleys 11a and 11b, and the rotation of output pulleys 12a and 12b can be controlled based on the output of the rotary encoder.

[0016] Between the entry pulley 11a and the exit pulley 12a, and between the entry pulley 11b and the exit pulley 12b, a heating block 20 and a cooling block 30 are arranged side by side in the moving direction of the product. Note that, although one heating block 20 is used in this embodiment, multiple heating blocks 20 may also be used.

[0017] The heating block 20 applies a compressive force to the product located between the pair of belts 13a, 13b via the belts 13a, 13b. An exciting coil 21 is disposed inside the heating block 20, and the exciting coil 21 inductively heats the belts 13a, 13b. The heat generated by the belts 13a, 13b is transferred to the product, thereby heating the product.

[0018] In this manner, the product is compressed and molded while being conveyed while being sandwiched between the pair of belts 13a, 13b and heated by the pair of heating blocks 20. The compression-molded product is cooled by the pair of cooling blocks 30 while being conveyed while being sandwiched between the pair of belts 13a, 13b, and then discharged from the double belt press 1.

[0019] The cooling block 30 is provided with a cooling flow path 31 for flowing a cooling medium. By flowing the cooling medium through the cooling flow path 31, the cooling block 30 can be cooled, and as a result, the product can be cooled via the belts 13a and 13b. The position where the cooling flow path 31 is provided can be appropriately determined so that the entire cooling block 30 can be cooled.

[0020] (Heating block configuration) If the exciting coil 21 is excessively heated, the performance of inductively heating the belts 13a and 13b is reduced, so in this embodiment, the exciting coil 21 is cooled. A specific configuration of the heating block 20 will be described below.

[0021] The heating block 20 is provided with exciting coils 21 arranged in an arrangement pattern (one example) shown in Fig. 2. The left-right direction in Fig. 2 corresponds to the width direction of the belts 13a, 13b, and the up-down direction in Fig. 2 corresponds to the moving directions D1, D2 of the belts 13a, 13b. By arranging the exciting coils 21 over the entire width direction of the belts 13a, 13b, the entire belts 13a, 13b can be induction heated.

[0022] 3 is a schematic diagram showing the internal structure of heating block 20, and shows heating block 20 corresponding to belt 13a. The dotted arrows shown in FIG. 3 indicate the direction in which cooling gas (e.g., air) for cooling excitation coil 21 moves. The left-right direction in FIG. 3 corresponds to the width direction of belt 13a. The heating block 20 corresponding to belt 13b also has the structure shown in FIG. 3.

[0023] As shown in Fig. 3, the heating block 20 has a block body 22, and the inside of the block body 22 is divided into one supply passage C1 and two discharge passages C2 by two partitions 22a. The supply passage C1 is disposed between the two discharge passages C2. An opening 22b is formed in the upper part of the supply passage C1, and a fan 23 is connected to the opening 22b. By driving the fan 23, the cooling gas for cooling the excitation coil 21 passes through the opening 22b and is guided to the supply passage C1.

[0024] The lower part of the block body 22 is constituted by a first flow passage forming part 24 and a second flow passage forming part 25, and the first flow passage forming part 24 and the second flow passage forming part 25 can be formed of a heat-resistant material. The first flow passage forming part 24 constitutes a part of the supply passage C1 and a part of the discharge passage C2. In the first flow passage forming part 24, an opening 24a is formed in a region corresponding to the supply passage C1 as shown in Figures 3 and 4, and a plurality of openings 24b are formed in a region corresponding to each discharge passage C2 as shown in Figure 4.

[0025] Fig. 4 is a view of the first flow path forming portion 24 as seen from inside the block body 22, and Fig. 4 also shows the direction of movement of the belt 13a relative to the heating block 20. As shown in Fig. 4, the multiple openings 24b are arranged along the exciting coil 21. Fig. 3 corresponds to a cross-sectional view taken along line AA in Fig. 4.

[0026] As shown in Fig. 3, a flow path FP is formed between the first flow path forming portion 24 and the second flow path forming portion 25, and the excitation coil 21 is accommodated in this flow path FP. Fig. 5 is an enlarged view of an area R surrounded by a dotted line in Fig. 3. The dotted arrow in Fig. 5 indicates the direction in which the cooling gas moves. As shown in Fig. 5, the first flow path forming portion 24 is formed with an accommodating groove 24c that accommodates the upper end portion of the excitation coil 21, and the second flow path forming portion 25 is formed with an accommodating groove 25a that accommodates the lower end portion of the excitation coil 21.

[0027] The accommodating grooves 24c, 25a are formed according to the arrangement pattern of the exciting coil 21 (see FIG. 2), and by accommodating the exciting coil 21 in the accommodating grooves 24c, 25a, the exciting coil 21 can be positioned in the heating block 20. Note that in this embodiment, the accommodating groove 24c is formed in the first flow path forming portion 24, and the accommodating groove 25a is formed in the second flow path forming portion 25, but this is not limited to this. Specifically, the accommodating groove 24c can be formed only in the first flow path forming portion 24, or the accommodating groove 25a can be formed only in the second flow path forming portion 25. Even in these cases, the exciting coil 21 can be positioned.

[0028] The cooling air introduced into the supply passage C1 passes through the opening 24a of the first flow passage forming portion 24, and then moves through the flow passage FP formed between the first flow passage forming portion 24 and the second flow passage forming portion 25, and comes into contact with the exciting coil 21. As can be seen from FIG. 4, the cooling air that enters from the opening 24a moves along the exciting coil 21, and is then introduced to the opening 24b. While the cooling gas moves from the opening 24a to the opening 24b, the cooling air comes into contact with the exciting coil 21, thereby cooling the exciting coil 21. This makes it possible to suppress a decrease in the performance of induction heating of the belts 13a and 13b due to an excessive rise in the temperature of the exciting coil 21.

[0029] 5, the cooling gas that has exchanged heat with the excitation coil 21 passes through the opening 24b of the first flow path forming portion 24 and is discharged to the discharge passage C2. As shown in FIG. 3, an exhaust duct 26 is connected to the discharge passage C2, and the cooling gas discharged to the discharge passage C2 is discharged to the outside of the heating block 20 via the exhaust duct 26.

[0030] 3, a guide plate 40 can be disposed between the heating block 20 and the belt 13a. The guide plate 40 is fixed to the second flow path forming portion 25 of the heating block 20, and contacts the surface of the belt 13a. By providing the guide plate 40, the belt 13a can be moved along the guide plate 40, and deformation of the belt 13a can be suppressed. The guide plate 40 may be omitted.

[0031] The guide plate 40 may be configured with one guide plate 40 as shown in Fig. 6, or may be configured with multiple guide plates 40 as shown in Fig. 7. Figs. 6 and 7 also show the direction in which the belt 13a moves relative to the guide plate 40. In the configuration shown in Fig. 7, each guide plate 40 extends in the width direction of the belt 13a, and three guide plates 40 are arranged side by side along the moving direction D1 of the belt 13a. When multiple guide plates 40 are used as shown in Fig. 7, the total number of guide plates 40 and the positions at which each guide plate 40 is arranged can be determined appropriately.

[0032] (Variation 1) In this embodiment, as shown in Fig. 5, the cooling gas that has exchanged heat with the exciting coil 21 passes through the opening 24b of the first flow path forming portion 24 and is guided to the discharge passage C2, but is not limited thereto. Specifically, as shown in Fig. 8, the cooling gas that has exchanged heat with the exciting coil 21 can be discharged toward the surface of the belt 13a.

[0033] 8, the first flow path forming portion 24 is formed with an accommodating groove 24c that accommodates the upper end portion of the excitation coil 21, and the second flow path forming portion 25 is formed with an accommodating groove 25a that accommodates the lower end portion of the excitation coil 21. In this modified example, the opening 24b described in the present embodiment is not formed in the first flow path forming portion 24, and the opening 25b is formed in the second flow path forming portion 25.

[0034] The opening 25b can be formed in the same position as the opening 24b (see FIG. 4). As described above, when the guide plate 40 is disposed between the heating block 20 and the belt 13a, the opening 25b can be formed in a region of the second flow path forming section 25 different from the region to which the guide plate 40 is fixed. This allows the cooling gas to be discharged from the opening 25b toward the belt 13a without the opening 25b being blocked by the guide plate 40. The cooling gas is discharged into the atmosphere after coming into contact with the belt 13a.

[0035] Here, when the guide plate 40 shown in Fig. 6 is used, the length of the guide plate 40 in the left-right direction in Fig. 6 can be made smaller than the width of the belt 13a. In this case, the cooling gas that has passed through the opening 25b of the second flow path forming part 25 is discharged toward both ends in the width direction of the belt 13a. Here, in a usage environment in which the temperature of both ends of the belt 13a becomes higher than the temperature of the center part of the belt 13a, by discharging the cooling gas to both ends in the width direction of the belt 13a as described above, it is possible to suppress the temperature variation in the width direction of the belt 13a.

[0036] On the other hand, when the guide plate 40 shown in FIG. 7 is used, the cooling gas that passes through the openings 25b provided at a position that does not overlap with the guide plate 40 is discharged toward the surface of the belt 13a.

[0037] In this modification, the cooling gas that has passed through the opening 24a of the first flow path forming portion 24 comes into contact with the exciting coil 21 while moving through the flow path FP formed between the first flow path forming portion 24 and the second flow path forming portion 25. The cooling air that has entered from the opening 24a moves along the exciting coil 21, and is then led to the opening 25b of the second flow path forming portion 25. While the cooling gas moves from the opening 24a to the opening 25b, the cooling air comes into contact with the exciting coil 21, thereby cooling the exciting coil 21. This makes it possible to suppress a decrease in the performance of induction heating of the belt 13a due to an excessive rise in the temperature of the exciting coil 21.

[0038] (Variation 2) The heating block 20 may be provided with a temperature adjustment mechanism for adjusting the temperature of the belts 13a and 13b. This temperature adjustment mechanism will be described with reference to Figs. 9 and 10. Fig. 9 is a diagram showing the arrangement of multiple types of rollers, and Fig. 10 is a cross-sectional view showing the peripheral structure of each roller. The dotted arrows in Figs. 9 and 10 indicate the direction in which a liquid (e.g., oil) flows to adjust the temperature of the belt 13a.

[0039] The temperature adjustment mechanism can be provided on the surface of the heating block 20 that faces the belts 13a and 13b. Specifically, the temperature adjustment mechanism can be provided on the second flow path forming portion 25 described in this embodiment.

[0040] 9, a plurality of discharge rollers 51 are disposed upstream of the belt 13a in the moving direction D1, and the plurality of discharge rollers 51 are disposed side by side in the width direction of the belt 13a. Each discharge roller 51 is rotatable around a rotation axis extending in the width direction of the belt 13a, and contacts the surface of the belt 13a. The discharge rollers 51 rotate in response to the movement of the belt 13a in the direction of the arrow D1.

[0041] A plurality of suction rollers 52 are disposed downstream in the moving direction D1 of the belt 13a, and the plurality of suction rollers 52 are disposed side by side in the width direction of the belt 13a. Each of the suction rollers 52 is rotatable around a rotation axis extending in the width direction of the belt 13a, and contacts the surface of the belt 13a. The suction rollers 52 rotate in response to the movement of the belt 13a in the direction of the arrow D1.

[0042] A plurality of straightening rollers 53 are disposed between the discharge roller 51 and the suction roller 52, and the plurality of straightening rollers 53 are disposed side by side in the width direction of the belt 13a or in the moving direction D1 of the belt 13a. Each straightening roller 53 is rotatable around a rotation axis extending in the width direction of the belt 13a and contacts the surface of the belt 13a. The straightening roller 53 rotates in response to the movement of the belt 13a in the direction of the arrow D1. A plurality of grooves are formed in the outer peripheral surface of the straightening roller 53 along the circumferential direction.

[0043] 10, heating block 20 has, on the surface facing belt 13a, accommodation section 27a that accommodates discharge roller 51, accommodation section 27b that accommodates suction roller 52, and accommodation section 27c that accommodates straightening roller 53. Accommodation section 27a rotatably supports discharge roller 51, accommodation section 27b rotatably supports suction roller 52, and accommodation section 27c rotatably supports straightening roller 53.

[0044] A liquid supply passage 28a is connected to the storage section 27a, and liquid (e.g., oil) is supplied from the liquid supply passage 28a to the storage section 27a. The liquid supplied to the storage section 27a is discharged onto the surface of the belt 13a from a discharge port PO located on the rectifying roller 53 side with respect to the discharge roller 51. The discharged liquid moves toward the rectifying roller 53 while moving along the surface of the belt 13a.

[0045] The liquid that has reached the straightening roller 53 passes through grooves formed in the outer circumferential surface of the straightening roller 53, and then heads toward the suction roller 52. The liquid heading toward the suction roller 52 moves from the suction port PI located on the straightening roller 53 side of the suction roller 52 to the storage section 27b. A liquid discharge passage 28b is connected to the storage section 27b, and the liquid sucked into the storage section 27b moves to the liquid discharge passage 28b. The liquid that has moved through the liquid discharge passage 28b can be returned to the liquid supply passage 28a, allowing the liquid to be circulated.

[0046] As described above, the temperature of the belt 13a can be adjusted by moving the liquid along the surface of the belt 13a. Here, the temperature of the liquid may be set so that the temperature of the belt 13a falls within a desired temperature range.

[0047] (Variation 3) On the other hand, instead of the temperature adjustment mechanism shown in Figures 9 and 10, a temperature adjustment mechanism shown in Figures 11 and 12 can be used. Figure 11 is a diagram showing the arrangement of multiple types of plates, and Figure 12 is a cross-sectional view showing the peripheral structure of each plate. The dotted arrows in Figures 11 and 12 indicate the direction in which a liquid (e.g., oil) flows to adjust the temperature of the belt 13a.

[0048] 11, a pair of discharge plates 61 are disposed upstream of the belt 13a in the moving direction D1, and the pair of discharge plates 61 are disposed side by side in the width direction of the belt 13a. Each discharge plate 61 contacts the surface of the belt 13a. The number of discharge plates 61 may be one, or three or more.

[0049] A pair of suction plates 62 are disposed downstream in the moving direction D1 of the belt 13a, and the pair of suction plates 62 are disposed side by side in the width direction of the belt 13a. Each suction plate 62 contacts the surface of the belt 13a. The number of suction plates 62 may be one, or three or more.

[0050] A plurality of rectifying plates 63 are disposed between the discharge plate 61 and the suction plate 62, and the plurality of rectifying plates 63 are disposed side by side in the width direction of the belt 13a or in the moving direction D1 of the belt 13a. A plurality of grooves 63a are formed in the outer surface of the rectifying plate 63 facing the belt 13a along the width direction, and each of the rectifying plates 63 comes into contact with the surface of the belt 13a.

[0051] As shown in FIG. 12, the heating block 20 has a housing portion 29a that houses the discharge plate 61, a housing portion 29b that houses the suction plate 62, and a housing portion 29c that houses the straightening plate 63 on the surface facing the belt 13a.

[0052] A liquid supply passage 28a is connected to the storage section 29a, and liquid (e.g., oil) is supplied from the liquid supply passage 28a to the storage section 29a. The liquid supplied to the storage section 29a is discharged onto the surface of the belt 13a from a discharge port PO located on the rectifying plate 63 side of the discharge plate 61. The discharged liquid moves toward the rectifying plate 63 while moving along the surface of the belt 13a.

[0053] The liquid that reaches the straightening plate 63 passes through grooves formed in the outer peripheral surface of the straightening plate 63, and then heads toward the suction plate 62. The liquid heading toward the suction plate 62 moves from the suction port PI located on the straightening plate 63 side of the suction plate 62 to the storage section 29b. The liquid discharge passage 28b is connected to the storage section 29b, and the liquid sucked in from the suction port PI moves to the liquid discharge passage 28b. The liquid that has moved through the liquid discharge passage 28b can be returned to the liquid supply passage 28a, allowing the liquid to be circulated.

[0054] As described above, the temperature of the belt 13a can be adjusted by moving the liquid along the surface of the belt 13a. Here, the temperature of the liquid may be set so that the temperature of the belt 13a falls within a desired temperature range.

[0055] (Variation 4) In this embodiment, as described with reference to Fig. 4, the first flow passage forming portion 24 is formed with a plurality of openings 24b along the exciting coil 21. The openings 24b are used to discharge the cooling air to the discharge passage C2 after moving through the flow passage FP to cool the exciting coil 21, but are not limited to the shape and arrangement of the openings 24b shown in Fig. 4.

[0056] Another modified example (one example) will be described with reference to Figures 13 to 15. Figures 13 to 15 are views of the first flow path forming part 24 as seen from the discharge passage C2 side. Openings 24b1 to 24b3, which will be described later, have the same function as opening 24b, and can be provided at the position where opening 24b shown in Figure 4 is provided.

[0057] 13, the opening 24b1 of the first flow path forming portion 24 is formed along the excitation coil 21 at a position not overlapping with the excitation coil 21. The opening 24b1 extends in a direction along the excitation coil 21 compared to the opening 24b.

[0058] 14, the opening 24b2 of the first flow path forming portion 24 includes an area that overlaps with multiple portions of the excitation coil 21 and an area that does not overlap with the excitation coil 21. Multiple portions of the excitation coil 21 are exposed inside the opening 24b2. The housing groove 24c that houses the upper end portion of the excitation coil 21 is not provided in the area where the opening 24b2 is formed, but the housing groove 24c is provided in the area where the opening 24b2 is not formed.

[0059] In the third modified example shown in FIG. 15, the opening 24b3 of the first flow passage forming portion 24 includes an area overlapping the excitation coil 21 and an area not overlapping the excitation coil 21, similar to the second modified example (FIG. 14). In the second modified example, the opening 24b2 overlaps with a plurality of parts of the excitation coil 21, but in the third modified example, the opening 24b3 overlaps with a part of the excitation coil 21. A part of the excitation coil 21 is exposed inside the opening 24b3. In the area where the opening 24b3 is formed, the accommodation groove 24c for accommodating the upper end of the excitation coil 21 is not provided, but the accommodation groove 24c is provided in the area where the opening 24b3 is not formed. [Explanation of symbols]

[0060] 1: double belt press, 11a, 11b: inlet pulleys, 12a, 12b: outlet pulleys, 13a, 13b: belt, 20: heating block, 21: excitation coil, 22: block body, 22a: partition, 22b: opening, 23: fan, 24: first flow path forming portion, 24a, 24b: opening, 24c: receiving groove, 25: second flow passage forming portion, 25a: accommodation groove, 25b: opening, 26: exhaust duct, 27a, 27b, 27c: storage section, 28a: liquid supply passage, 28b: liquid discharge passage, 29a, 29b, 29c: storage section, 30: cooling block, 31: cooling flow path, 40: guide plate, 51: discharge roller, 52: suction roller, 53: straightening roller, 61: discharge plate, 62: suction plate, 63: flow straightening plate, C1: supply passage, C2: Discharge passage

Claims

1. A heating block for use in a double belt press, comprising: An excitation coil that inductively heats a metal belt; a first flow passage forming section and a second flow passage forming section that accommodate the excitation coil and form a flow passage through which a cooling gas for cooling the excitation coil moves; A heating block comprising:

2. A supply passage for supplying the cooling gas is provided, The heating block according to claim 1 , wherein the first flow path forming portion has an opening for guiding the cooling gas from the supply passage to the flow path.

3. a discharge passage for discharging the cooling gas; 3. The heating block according to claim 2, wherein the first flow passage forming portion has an opening for guiding the cooling gas that has exchanged heat with the excitation coil from the flow passage to the exhaust passage.

4. 3. The heating block according to claim 2, wherein the second flow passage forming portion has an opening for discharging the cooling gas that has exchanged heat with the excitation coil from the flow passage toward the surface of the belt.

5. 5. The heating block according to claim 4, wherein the openings of the second flow passage forming portion are provided at positions corresponding to both ends of the belt in a width direction.

6. 2 . The heating block according to claim 1 , wherein at least one of the first flow passage forming portion and the second flow passage forming portion has an accommodation groove that accommodates an end portion of the excitation coil.

7. 2. The heating block according to claim 1, further comprising a guide plate fixed to the second flow passage forming portion and in contact with the belt.

8. A double belt press comprising a heating block according to any one of claims 1 to 7.

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