Heating block and double belt press

Abstract

To suppress an excessive rise in temperature of an excitation coil.SOLUTION: A heating block (20) for use in a double belt press includes an excitation coil (21) and a housing unit (40). The excitation coil (21) inductively heats metal belts (13a, 13b). The housing unit (40) is fixed to a block body (22), and forms housing chambers (S1, S2) for housing the excitation coil (21) and a coolant (CL) for cooling the excitation coil (21).SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a heating block for use in a double belt press, the heating block being provided with an excitation coil. [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 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] Japanese Patent Application Laid-Open No. 2014-151349 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 and a storage unit. The excitation coil inductively heats a metal belt. The storage unit is fixed to the block body and forms a storage chamber that stores the excitation coil and a coolant for cooling the excitation coil.

[0006] The accommodation unit may be configured with a first plate, a second plate, and a spacer. The first and second plates form a first accommodation chamber that accommodates an excitation coil and a coolant. The spacer is disposed between the first plate and the block body and forms a second accommodation chamber to which the coolant is supplied from outside the heating block. Here, the first plate may be provided with an opening that allows the coolant to move from the second accommodation chamber to the first accommodation chamber. Furthermore, the multiple openings may be arranged along the excitation coil.

[0007] At least one of the first plate and the second plate may be provided with an accommodation groove for accommodating an end of the excitation coil, and the second plate may be provided with an air vent hole for discharging air bubbles contained in the first accommodation chamber to the outside.

[0008] The accommodation unit can be composed of a first plate, a second plate, and a third plate. The first plate has an accommodation groove that accommodates the entire excitation coil and forms a gap between the excitation coil and the first plate. The second plate is placed on top of the first plate and has an opening that communicates with the accommodation groove. The third plate has a flow path that allows the coolant to flow and communicates with the opening of the second plate.

[0009] The first plate may be provided with a communication hole that connects multiple portions of the accommodation groove, and a bubble vent hole for discharging air bubbles contained in the accommodation groove to the outside.

[0010] The heating block may be provided with a seal member that contacts the surface of the belt and is used to retain the cooling liquid between the heating block and the belt. A guide plate that contacts the belt may be fixed to the storage unit.

[0011] The second invention of the present application is a double belt press having the heating block of the first invention of the present application. [Effects of the Invention]

[0012] According to the present invention, by bringing the coolant into contact with the excitation coil in the accommodation chamber formed by the accommodation unit, it is possible to suppress a rise in temperature of the excitation coil. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a schematic diagram showing the configuration of a double belt press. [Figure 2] FIG. 2 is a diagram showing an arrangement pattern of excitation coils. [Figure 3] FIG. 2 is a schematic diagram showing the internal structure of a heating block. [Figure 4] FIG. 2 is a view of the first plate as seen from inside the heating block. [Figure 5] FIG. 10 is a diagram showing the state in which a coolant for cooling the excitation coil is contained. [Figure 6] FIG. 10 is a diagram illustrating an example of a guide plate. [Figure 7] FIG. 10 is a diagram showing another example of a guide plate. [Figure 8] 10 is a diagram illustrating an opening in a first plate in Modification 1. FIG. [Figure 9] 10 is a diagram illustrating another opening in the first plate in the first modification. FIG. [Figure 10] 10 is a diagram illustrating another opening in the first plate in the first modification. FIG. [Figure 11] 10 is a schematic diagram showing the internal structure (part) of a heating block in Modification 2. FIG. [Figure 12] 10 is a schematic diagram showing the structure of a first plate in Modification 2. FIG. [Figure 13] FIG. 10 is a diagram illustrating a temperature adjustment mechanism for adjusting the temperature of the belt in Modification 3. [Figure 14] FIG. 10 is a diagram illustrating a temperature adjustment mechanism for adjusting the temperature of the belt in Modification 3. [Figure 15] FIG. 13 is a diagram illustrating a temperature adjustment mechanism for adjusting the temperature of the belt in Modification 4. [Figure 16]FIG. 13 is a diagram illustrating a temperature adjustment mechanism for adjusting the temperature of the belt in Modification 4. DETAILED DESCRIPTION OF THE INVENTION

[0014] (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 in 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.

[0015] The double belt press 1 has a pair of entry pulleys 11a and 11b and a pair of exit pulleys 12a and 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 and 13b may be made of metal such as steel. The tension of the belts 13a and 13b can be adjusted by adjusting the positions of the entry pulleys 11a and 11b.

[0016] A power source (not shown) is connected to 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. Also, a power source (not shown) is connected to 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. Rotary encoders (not shown) are connected to 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.

[0017] A heating block 20 and a cooling block 30 are arranged side by side in the moving direction of the product between the entry pulley 11a and the exit pulley 12a, and between the entry pulley 11b and the exit pulley 12b. Although one heating block 20 is used in this embodiment, multiple heating blocks 20 can also be used.

[0018] 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.

[0019] In this way, the product is conveyed between the pair of belts 13a and 13b, and is compression molded while being heated by the pair of heating blocks 20. The compression molded product is conveyed between the pair of belts 13a and 13b, and is then cooled by the pair of cooling blocks 30, and is then discharged from the double belt press 1.

[0020] The cooling block 30 is provided with a cooling flow path 31 through which a cooling medium flows. 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 at which the cooling flow path 31 is provided can be determined appropriately so that the entire cooling block 30 can be cooled.

[0021] (Heating block configuration) If the exciting coil 21 is excessively heated, the performance of induction heating the belts 13a and 13b will be reduced, so in this embodiment, the exciting coil 21 is cooled. The specific configuration of the heating block 20 will be described below.

[0022] 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 and 13b, and the up-down direction in Fig. 2 corresponds to the movement directions D1 and D2 of the belts 13a and 13b. By arranging the exciting coils 21 over the entire width direction of the belts 13a and 13b, the entire belts 13a and 13b can be induction heated.

[0023] 3 is a schematic diagram showing the internal structure of heating block 20, illustrating heating block 20 corresponding to belt 13a. The left-right direction in FIG. 3 corresponds to the width direction of belt 13a. Note that heating block 20 corresponding to belt 13b also has the structure shown in FIG. 3.

[0024] As shown in Fig. 3, the heating block 20 has a block body 22, and a recess 22a is formed in the block body 22. A storage unit 40 is disposed in the recess 22a, and the storage unit 40 is composed of a spacer 41, a first plate 42, and a second plate 43. The first plate 42 and the second plate 43 can be made of a heat-resistant material. A storage chamber surrounded by the recess 22a and the storage unit 40 contains a coolant (e.g., oil) CL and an exciting coil 21.

[0025] A second plate 43 is fixed to the outer edge of the first plate 42, and the first plate 42 and the second plate 43 form a first storage chamber S1 that stores the coolant CL and the excitation coil 21. Meanwhile, the upper end surface of the spacer 41 is fixed to the bottom surface of the recess 22a, and the first plate 42 is fixed to the lower end surface of the spacer 41. Because the spacer 41 is disposed between the bottom surface of the recess 22a and the first plate 42, a second storage chamber S2 that stores the coolant CL is formed between the bottom surface of the recess 22a and the first plate 42. The coolant CL is supplied to the second storage chamber S2 from outside the heating block 20.

[0026] Fig. 4 is a view of the first plate 42 as seen from inside the block main body 22, and also shows the direction of movement of the belt 13a relative to the heating block 20. Fig. 3 corresponds to a cross-sectional view taken along line AA in Fig. 4.

[0027] As shown in Fig. 4, a plurality of openings 42a are formed in the first plate 42, and the plurality of openings 42a are arranged along the exciting coil 21 at positions that do not interfere with the exciting coil 21. Fig. 4 shows only some of the openings 42a, and the total number of openings 42a and the positions at which the openings 42a are provided can be determined appropriately. The coolant CL accommodated in the second accommodation chamber S2 passes through the openings 42a of the first plate 42 and moves to the first accommodation chamber S1.

[0028] Fig. 5 is an enlarged view of the region R surrounded by the dotted line in Fig. 3. As shown in Fig. 5, the first plate 42 has an accommodating groove 42b formed therein to accommodate the upper end of the excitation coil 21, and the second plate 43 has an accommodating groove 43a formed therein to accommodate the lower end of the excitation coil 21.

[0029] The accommodating grooves 42b, 43a 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 42b, 43a, the exciting coil 21 can be positioned in the heating block 20. Note that in this embodiment, the accommodating groove 42b is formed in the first plate 42 and the accommodating groove 43a is formed in the second plate 43, but this is not limitative. Specifically, the accommodating groove 42b can be formed only in the first plate 42, or the accommodating groove 43a can be formed only in the second plate 43. In either case, the exciting coil 21 can be positioned.

[0030] As described above, the exciting coil 21 can be cooled by moving the coolant CL from the second housing chamber S2 to the first housing chamber S1 and bringing the coolant CL into contact with the exciting coil 21. This prevents the temperature of the exciting coil 21 from excessively increasing and the performance of induction heating of the belts 13a, 13b from deteriorating. Here, the opening 42a of the first plate 42 can be provided at a position that allows the coolant to come into contact with the entire exciting coil 21.

[0031] The second plate 43 may be formed with a bubble vent hole (not shown) for discharging bubbles (air) present in the first housing chamber S1 to the outside. The location of this bubble vent hole may be determined as appropriate, but for example, the bubble vent hole may be provided at a position corresponding to a corner (at least one of the four corners) of the excitation coil 21 shown in FIG. 2. If bubbles come into contact with the excitation coil 21, the contact area between the excitation coil 21 and the coolant CL decreases, and the cooling performance of the coolant CL for the excitation coil 21 decreases. Therefore, by discharging bubbles in the first housing chamber S1 to the outside using the bubble vent hole, it is possible to prevent a decrease in the cooling performance of the excitation coil 21.

[0032] If air bubble vent holes are provided in the second plate 43, not only air bubbles but also the coolant CL may leak to the outside, and a layer of the coolant CL may form between the heating block 20 and the belt 13a. Therefore, by arranging a seal member 23 along the outer edge of the block main body 22 as shown in Figure 3, it is possible to prevent the coolant CL that has leaked onto the surface of the belt 13a from leaking outside the heating block 20.

[0033] 3, a guide plate 50 can be disposed between the heating block 20 and the belt 13a. The guide plate 50 is fixed to the second plate 43 of the heating block 20 and contacts the surface of the belt 13a. By providing the guide plate 50, the belt 13a can be moved along the guide plate 50, thereby suppressing deformation of the belt 13a. When air vent holes are provided in the second plate 43, the guide plate 50 can be provided in a position that does not block the air vent holes. The guide plate 50 can also be omitted.

[0034] The guide plate 50 may be configured with one guide plate 50 as shown in Fig. 6, or may be configured with multiple guide plates 50 as shown in Fig. 7. Figs. 6 and 7 also show the direction in which the belt 13a moves relative to the guide plate 50. In the configuration shown in Fig. 7, each guide plate 50 extends in the width direction of the belt 13a, and three guide plates 50 are arranged side by side along the moving direction D1 of the belt 13a. When multiple guide plates 50 are used as shown in Fig. 7, the total number of guide plates 50 and the positions at which each guide plate 50 is arranged can be determined as appropriate.

[0035] (Variation 1) In this embodiment, as described with reference to Fig. 4, a plurality of openings 42a are formed along the exciting coil 21. These openings 42a are used to move the coolant CL from the second storage chamber S2 to the first storage chamber S1, but the shape and arrangement of the openings 42a are not limited to those shown in Fig. 4.

[0036] Another modified example (one example) will be described with reference to Figures 8 to 10. Figures 8 to 10 are views of the first plate 42 as seen from the side of the second storage chamber S2. Openings 42a1 to 42a3, which will be described later, have the same function as opening 42a.

[0037] 8, the opening 42a1 of the first plate 42 is formed along the exciting coil 21 at a position that does not overlap with the exciting coil 21. The opening 42a1 extends in a direction along the exciting coil 21 compared to the opening 42a.

[0038] 9, the opening 42a2 of the first plate 42 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 42a2. The area where the opening 42a2 is formed does not have an accommodating groove 42b that accommodates the upper end of the excitation coil 21, but the area where the opening 42a2 is not formed does have an accommodating groove 42b.

[0039] In another modified example shown in Fig. 10, the opening 42a3 of the first plate 42 includes an area that overlaps with the excitation coil 21 and an area that does not overlap with the excitation coil 21, similar to Fig. 9. In the modified example shown in Fig. 9, the opening 42a2 overlaps with multiple portions of the excitation coil 21, but in the modified example shown in Fig. 10, the opening 42a3 overlaps with a portion of the excitation coil 21. A portion of the excitation coil 21 is exposed inside the opening 42a3. The area where the opening 42a3 is formed does not have an accommodating groove 42b that accommodates the upper end of the excitation coil 21, but the area where the opening 42a3 is not formed has an accommodating groove 42b.

[0040] (Variation 2) Modification 2 of this embodiment will be described with reference to Fig. 11. Fig. 11 is a schematic diagram showing the structure of a portion of the heating block 20, and the same reference numerals are used for members having the same functions as those described in the above embodiment.

[0041] The accommodation unit 40 has a first plate 44, a second plate 45, and a third plate 46, and an accommodation chamber that accommodates the coolant CL and the exciting coil 21 is formed inside the accommodation unit 40. The first plate 44 is disposed in a position facing the belt 13a and has an accommodation groove 44a that accommodates the entire exciting coil 21. The accommodation groove 44a is formed according to the arrangement pattern of the exciting coil 21 (see FIG. 2), and when the exciting coil 21 is accommodated in the accommodation groove 44a, the upper surface of the exciting coil 21 (the surface facing the second plate 45) is exposed from the accommodation groove 44a. In addition, a gap is formed between the accommodation groove 44a and the exciting coil 21, and the coolant CL penetrates into this gap.

[0042] The second plate 45 is disposed between the first plate 44 and the third plate 46, and has a plurality of openings 45a. The third plate 46 is disposed between the second plate 45 and the block body 22 of the heating block 20, and has a plurality of flow paths 46a through which the coolant CL flows. The coolant CL is supplied to the plurality of flow paths 46a from outside the heating block 20. The plurality of flow paths 46a may be independent of one another, or may be partially connected.

[0043] The opening 45a of the second plate 45 is connected to the flow path 46a of the third plate 46, and the coolant CL supplied to the flow path 46a is guided to the opening 45a. The opening 45a is also connected to the housing groove 44a, and the coolant CL passes through the opening 45a and is guided to the housing groove 44a. As described above, a gap is formed between the housing groove 44a and the exciting coil 21, and the coolant CL can enter this gap to cool the exciting coil 21.

[0044] When a plurality of heating blocks 20 are arranged side by side in the moving direction D1 of the belt 13a, the flow paths 46a of the third plates 46 in the plurality of heating blocks 20 can be connected to each other.

[0045] 12, the first plate 44 may be provided with a communication hole 44b that connects at least two portions of the accommodation groove 44a. This allows the coolant CL that has entered the accommodation groove 44a to move through the communication hole 44b. The position of the communication hole 44b may be determined as appropriate, and the communication hole 44b may also be omitted.

[0046] The first plate 44 may also be provided with a bubble vent hole 44c for discharging to the outside any bubbles (air) generated in the gap between the accommodation groove 44a and the excitation coil 21. One end of the bubble vent hole 44c may be connected to the accommodation groove 44a, and the other end of the bubble vent hole 44c may be formed on the surface of the first plate 44 that faces the belt 13a. This allows bubbles generated in the gap between the accommodation groove 44a and the excitation coil 21 to pass through the bubble vent hole 44c together with the coolant CL and be discharged to the outside of the heating block 20.

[0047] The bubble vent hole 44c can also be connected to the above-mentioned communication hole 44b instead of the accommodating groove 44a. Specifically, one end of the bubble vent hole 44c can be connected to the communication hole 44b, and the other end of the bubble vent hole 44c can be formed on the surface of the first plate 44 that faces the belt 13a. Even in this case, bubbles generated in the gap between the accommodating groove 44a and the exciting coil 21 pass through the communication hole 44b and the bubble vent hole 44c together with the coolant CL and are discharged to the outside of the heating block 20. The bubble vent hole 44c can be connected to at least one of the accommodating groove 44a and the communication hole 44b.

[0048] (Variation 3) 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 Figures 13 and 14. Figure 13 is a diagram showing the arrangement of multiple types of rollers, and Figure 14 is a cross-sectional view showing the peripheral structure of each roller. The dotted arrows in Figures 13 and 14 indicate the direction in which a liquid (e.g., oil) flows to adjust the temperature of the belt 13a.

[0049] The temperature adjustment mechanism can be provided on the surface of the heating block 20 that faces the belts 13a and 13b, and specifically, the temperature adjustment mechanism can be provided on the second plate 43 described in this embodiment.

[0050] 13, a plurality of discharge rollers 61 are arranged upstream of the belt 13a in the moving direction D1, and the plurality of discharge rollers 61 are arranged side by side in the width direction of the belt 13a. Each discharge roller 61 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 61 rotate in response to the movement of the belt 13a in the direction of arrow D1.

[0051] A plurality of suction rollers 62 are arranged downstream in the movement direction D1 of the belt 13a, and are arranged side by side in the width direction of the belt 13a. Each suction roller 62 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 62 rotate in response to the movement of the belt 13a in the direction of the arrow D1.

[0052] A plurality of rectifying rollers 63 are disposed between the discharge roller 61 and the suction roller 62, and the plurality of rectifying rollers 63 are disposed side by side in the width direction of the belt 13a or in the movement direction D1 of the belt 13a. Each rectifying roller 63 is rotatable around a rotation axis extending in the width direction of the belt 13a and contacts the surface of the belt 13a. The rectifying rollers 63 rotate in response to the movement of the belt 13a in the direction of arrow D1. A plurality of grooves are formed in the outer peripheral surface of the rectifying roller 63 along the circumferential direction.

[0053] 14, heating block 20 has, on the surface facing belt 13a, accommodation section 24a that accommodates discharge roller 61, accommodation section 24b that accommodates suction roller 62, and accommodation section 24c that accommodates rectifying roller 63. Accommodation section 24a rotatably supports discharge roller 61, accommodation section 24b rotatably supports suction roller 62, and accommodation section 24c rotatably supports rectifying roller 63.

[0054] A liquid supply passage 25a is connected to the container 24a, and a liquid (e.g., oil) is supplied to the container 24a from the liquid supply passage 25a. The liquid supplied to the container 24a is discharged onto the surface of the belt 13a from a discharge port PO located on the rectifying roller 63 side of the discharge roller 61. The discharged liquid moves along the surface of the belt 13a toward the rectifying roller 63.

[0055] The liquid that reaches the rectifying roller 63 passes through grooves formed in the outer peripheral surface of the rectifying roller 63 and then heads toward the suction roller 62. The liquid heading toward the suction roller 62 moves from the suction port PI located on the rectifying roller 63 side of the suction roller 62 to the storage unit 24b. A liquid discharge passage 25b is connected to the storage unit 24b, and the liquid sucked into the storage unit 24b moves to the liquid discharge passage 25b. The liquid that has moved through the liquid discharge passage 25b can be returned to the liquid supply passage 25a, allowing the liquid to be circulated.

[0056] 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 can be set so that the temperature of the belt 13a falls within a desired temperature range.

[0057] (Variation 4) On the other hand, instead of the temperature adjustment mechanisms shown in Figures 13 and 14, temperature adjustment mechanisms shown in Figures 15 and 16 can also be used. Figure 15 is a diagram showing the arrangement of multiple types of plates, and Figure 16 is a cross-sectional view showing the peripheral structure of each plate. The dotted arrows in Figures 15 and 16 indicate the direction in which a liquid (e.g., oil) flows to adjust the temperature of belt 13a.

[0058] 15, a pair of discharge plates 71 are arranged upstream of the belt 13a in the moving direction D1, and the pair of discharge plates 71 are arranged side by side in the width direction of the belt 13a. Each discharge plate 71 contacts the surface of the belt 13a. The number of discharge plates 71 may be one, or three or more.

[0059] A pair of suction plates 72 are arranged downstream in the moving direction D1 of the belt 13a, and the pair of suction plates 72 are arranged side by side in the width direction of the belt 13a. Each suction plate 72 contacts the surface of the belt 13a. The number of suction plates 72 may be one, or three or more.

[0060] A plurality of rectifying plates 73 are disposed between the discharge plate 71 and the suction plate 72. The plurality of rectifying plates 73 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 73a are formed in the outer surface of the rectifying plate 73 facing the belt 13a along the width direction, and each rectifying plate 73 comes into contact with the surface of the belt 13a.

[0061] As shown in FIG. 16, the heating block 20 has, on the surface facing the belt 13a, a housing portion 26a that houses the discharge plate 71, a housing portion 26b that houses the suction plate 72, and a housing portion 26c that houses the rectifying plate 73.

[0062] A liquid supply passage 27a is connected to the container 26a, and a liquid (e.g., oil) is supplied to the container 26a from the liquid supply passage 27a. The liquid supplied to the container 26a is ejected onto the surface of the belt 13a from an ejection port PO located on the rectifying plate 73 side of the ejection plate 71. The ejected liquid moves along the surface of the belt 13a toward the rectifying plate 73.

[0063] The liquid that reaches rectifying plate 73 passes through grooves formed in the outer peripheral surface of rectifying plate 73 and then heads toward suction plate 72. The liquid heading toward suction plate 72 moves from suction port PI, which is located on the rectifying plate 73 side of suction plate 72, to storage section 26b. Liquid discharge passage 27b is connected to storage section 26b, and the liquid sucked in from suction port PI moves to liquid discharge passage 27b. The liquid that has moved through liquid discharge passage 27b can be returned to liquid supply passage 27a, allowing the liquid to be circulated.

[0064] 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 can be set so that the temperature of the belt 13a falls within a desired temperature range. [Explanation of symbols]

[0065] 1: double belt press, 11a, 11b: inlet pulley, 12a, 12b: outlet pulley, 13a, 13b: belt, 20: heating block, 21: excitation coil, 22: block body, 22a: bottom surface, 23: sealing member, 24a, 24b, 24c: storage section, 25a: liquid supply passage, 25b: liquid discharge passage, 26a, 26b, 26c: storage section, 27a: liquid supply passage, 27b: liquid discharge passage, 30: cooling block, 31: cooling flow path, 40: storage unit, 41: spacer, 42: first plate, 42a: opening, 42b: receiving groove, 43: second plate, 43a: receiving groove, 44: first plate, 44a: receiving groove, 45: second plate, 45a: opening, 46: third plate, 46a: flow path, 50: guide plate, 61: discharge roller, 62: suction roller, 63: rectifying roller, 71: discharge plate, 72: suction plate, 73: rectifying plate

Claims

1. 1. A heating block for use in a double belt press, comprising: An excitation coil that inductively heats a metal belt; a housing unit fixed to the block body and forming a housing chamber for housing the excitation coil and a coolant for cooling the excitation coil; A heating block comprising:

2. The storage unit comprises: a first plate and a second plate that form a first chamber that accommodates the excitation coil and the coolant; a spacer disposed between the first plate and the block body, and defining a second chamber to which the cooling liquid is supplied from outside the heating block; 2. The heating block of claim 1, wherein the first plate has an opening for allowing the coolant to move from the second chamber to the first chamber.

3. The heating block according to claim 2 , wherein the plurality of openings are arranged along the excitation coil.

4. 3. The heating block according to claim 2, wherein at least one of the first plate and the second plate has an accommodation groove for accommodating an end of the excitation coil.

5. 3. The heating block according to claim 2, wherein the second plate has a bubble vent hole for discharging bubbles contained in the first chamber to the outside.

6. The storage unit comprises: a first plate having an accommodation groove that accommodates the entire excitation coil and forms a gap between the excitation coil and the first plate; a second plate overlapping the first plate and having an opening communicating with the receiving groove; a third plate having a flow path through which the cooling liquid flows and which is connected to the opening; 2. The heating block of claim 1, further comprising:

7. The heating block according to claim 6 , wherein the first plate has communication holes that connect a plurality of portions of the accommodation groove.

8. 7. The heating block according to claim 6, wherein the first plate has a bubble vent hole for discharging bubbles contained in the accommodation groove to the outside.

9. 9. The heating block according to claim 5, further comprising a seal member that contacts the surface of the belt and keeps the cooling liquid between the heating block and the belt.

10. The heating block according to claim 1 , further comprising a guide plate fixed to the storage unit and in contact with the belt.

11. A double belt press comprising the heating block according to claim 1.

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