JP7587622B2 - Continuous Heating Furnace - Google Patents

Description

This disclosure relates to a continuous heating furnace.

JP 2020-143883 A discloses a shutter device for a roller conveying type firing furnace. The shutter device includes upper and lower shutter members provided in the furnace body, a pair of support rods that pass between the conveying rollers and protrude downward from the lower ends of the upper and lower shutter members, and a shutter drive device that drives the upper and lower shutter members in the vertical direction via the pair of support rods to position them in an open position and a closed position. The shutter drive device is disposed below the furnace body. In such a shutter device, since the shutter drive device is disposed below the furnace body, it is said that there is no need to provide a large-scale cooling mechanism for the shutter drive device.

JP 2000-130953 A discloses a heat treatment furnace in which rollers are also provided in the section that divides the treatment chamber for the material to be treated. The rollers provided in the section that divides the treatment chamber are configured to be covered by an insulating door and an insulating wall that faces the insulating door. This configuration is said to be able to reduce heat loss.

JP 2020-143883 A JP 2000-130953 A

The inventors wish to reduce malfunctions of shutters in continuous heating furnaces that have shutters that separate processing chambers.

The continuous heating furnace disclosed herein includes a tunnel-shaped furnace body that encloses a space along a predetermined conveying direction, a plurality of conveying rollers that cross the tunnel-shaped furnace body and are arranged along the conveying direction, a shutter that divides the space in the conveying direction, and a shutter opening and closing device. At least one of the conveying rollers arranged at the position where the shutter is provided is configured so that its position can be adjusted individually. With such a continuous heating furnace, erroneous operation of the shutter is reduced.

FIG. 1 is a cross-sectional view of a continuous heating furnace 1. FIG. 2 is a cross-sectional view of the continuous heating furnace 1. FIG. 3 is a schematic diagram showing a support structure for the plurality of transport rollers 20. As shown in FIG. FIG. 4 is a schematic diagram of the roller support 30. As shown in FIG. FIG. 5 is a schematic diagram of the roller support 40. As shown in FIG. FIG. 6 is a schematic diagram of the roller support 30. As shown in FIG. FIG. 7 is a schematic diagram showing the height adjustment member 37. As shown in FIG. FIG. 8 is a schematic diagram showing the shutters 91 and 92. As shown in FIG.

One embodiment of the present disclosure will be described in detail below with reference to the drawings. In the following drawings, components and parts that perform the same function are described with the same reference numerals. Furthermore, the dimensional relationships (length, width, thickness, etc.) in each drawing do not reflect the actual dimensional relationships. The directions of up, down, left, right, front, and rear are represented by arrows U, D, L, R, F, and Rr, respectively, in the drawings. Here, the directions of up, down, left, right, front, and rear are determined merely for the convenience of explanation, and do not limit the present invention unless otherwise specified.

Figures 1 and 2 are cross-sectional views of the continuous heating furnace 1. Figure 1 shows a schematic longitudinal section of the continuous heating furnace 1 along the conveying direction. Figure 2 is a cross-sectional view taken along line II-II of Figure 1. Figure 2 shows a schematic transverse section of the continuous heating furnace 1 across the conveying direction.

<Continuous heating furnace 1>
As shown in Fig. 1 and Fig. 2, the continuous heating furnace 1 includes a furnace body 10, a plurality of conveying rollers 20, a plurality of roller supports 30, 40, shutters 91, 92, and a shutter opening/closing device 95. The continuous heating furnace 1 includes a pair of support tables 35, 45. The continuous heating furnace 1 is a heating furnace that continuously heats the workpiece (hereinafter also referred to as workpiece A) placed on a heating container while conveying it along the conveying direction. In this embodiment, the continuous heating furnace 1 is a so-called roller hearth kiln that heats the workpiece while conveying it in the conveying direction (from rear Rr to front F) by the rotation of the conveying rollers. The arrow in the figure indicates the conveying direction in which the workpiece A is conveyed.

<Furnace body 10>
The furnace body 10 encloses a space 10i in which the workpiece A is transported along the transport direction. The furnace body 10 is formed in a tunnel shape. As shown in Fig. 2, the furnace body 10 has a pair of side walls 50, 60, a bottom wall 70, and a ceiling wall 80. A transport roller 20 and a heater 12 are provided in the space 10i of the furnace body 10. The workpiece A is heat-treated by the heater 12 while being transported in the space 10i by the transport roller 20.

The heater 12 is a device for heat-treating the workpiece A transported on the transport rollers 20. In this embodiment, a burner-type heating device is used as the heater 12. The heater 12 is a device that burns fuel gas introduced from the pipe 13. By burning the fuel gas, the temperature inside the furnace increases and the workpiece A is heated. The heater 12 is provided on the side walls 50 and 60. The heater 12 is provided on the side walls 50 and 60 at predetermined heights above and below the transport rollers 20. The heater 12 is provided in a recess in the inner wall surface of the side walls 50 and 60.

The heater 12 is not limited to the heater 12 described above, so long as it can heat the workpiece A. The type, shape, arrangement, etc. of the heater 12 are not particularly limited and can be selected according to the heating conditions, etc. As the heater, for example, a cylindrical ceramic heater, a metal sheath heater, a plate-shaped panel heater, etc. may be used. The number, output, etc. of the heaters 12 can be set appropriately according to the processing conditions of the workpiece A. By changing the number, output, etc. of the heaters 12, the workpiece A can be processed under different processing conditions along the conveying direction.

Although not shown in the figure, a temperature sensor is provided in the space 10i. A thermocouple, an infrared thermometer, or the like can be used as the temperature sensor. The temperature sensor measures the temperature of the space 10i heated by the heater 12. The output of the heater 12 can be controlled according to the temperature of the space 10i measured by the temperature sensor. This allows the space 10i to be maintained at a preset temperature.

The furnace body 10 is made of a material that insulates the space 10i from heat and has fire resistance. In this embodiment, the furnace body 10 is made of firebricks. The firebricks are ceramic bricks, and may be made of alumina, mullite, or cordierite. The stacked firebricks are bonded together with adhesive or mortar. For example, adhesives or mortars containing highly heat-resistant ceramics such as alumina, magnesia, or zirconia may be used. The firebricks may be fixed together with adhesive, mortar, or the like. In this embodiment, the firebricks used in the area where the conveying roller 20 is inserted have through holes 50a and 60a. A single firebrick may have multiple through holes 50a and 60a.

The firebricks may be stacked to form the furnace body 10 so that the boundaries between the firebricks stacked on top of each other are not continuous. By not having continuous boundaries between the firebricks, the insulation properties can be good. Also, a stable layered structure of the furnace body 10 can be realized. The furnace body 10 may be made of ceramic plate-shaped insulation material as appropriate.

<Bottom wall 70>
The bottom wall 70 is made of substantially rectangular parallelepiped refractory bricks stacked in multiple stages. The bottom wall 70 supports the side walls 50, 60. The refractory bricks constituting the side walls 50, 60 are stacked upward from both ends of the bottom wall 70 in the width direction of the furnace body 10.

<Side walls 50, 60>
The side walls 50, 60 extend upward from the bottom wall 70. The inner wall surfaces of the side walls 50, 60 are formed substantially vertically. A plurality of through holes 50a, 60a are formed in the pair of side walls 50, 60, respectively. The through holes 50a, 60a are holes through which the conveying roller 20 is inserted, and penetrate the side walls 50, 60, respectively. The plurality of through holes 50a, 60a are formed at a substantially constant pitch along the conveying direction at a predetermined height of the side walls 50, 60. Note that the through holes 50a, 60a are not limited to those formed in the firebrick. The through holes 50a, 60a may be formed, for example, by side walls above and below the portion through which the conveying roller 20 is inserted, and a partition member disposed between the side walls.

The upper part of the side walls 50, 60 has an inclined surface 50b, 60b. The inclined surface 50b, 60b is a surface that inclines from the upper part of the side walls 50, 60 toward the inner wall surface. The inclined surface 50b, 60b is inclined so as to become lower toward the space 10i. The inclined surface 50b, 60b supports the ceiling wall 80. The inclined surface 50b, 60b forms the boundary between the side walls 50, 60 and the ceiling wall 80.

<Ceiling wall 80>
In this embodiment, the ceiling wall 80 is curved in the width direction of the furnace body 10. The ceiling wall 80 is made of firebricks. The ceiling wall 80 is formed in multiple layers. The configuration of the ceiling wall 80 is not particularly limited. The ceiling wall 80 may be formed substantially horizontally or inclined. The ceiling wall 80 in the upper part of the furnace body 10 is covered with multiple layers of blankets 15. The furnace body 10 may be provided with an exhaust path (not shown). Although not particularly limited, the exhaust path may be provided in the ceiling wall 80 of the furnace body 10.

The furnace body 10 may be externally covered by an outer frame 16. The outer frame 16 may be made of a metal that is highly rigid and heat-resistant. For example, stainless steel may be used as the outer frame 16.

<Multiple Conveying Rollers 20>
The multiple transport rollers 20 each cross the tunnel-shaped furnace body 10. The multiple transport rollers 20 are arranged along the transport direction. The multiple transport rollers 20 are each a hollow shaft member. In other words, the transport rollers 20 are cylindrical rollers. In this embodiment, a ceramic roller is used as the transport roller 20. The transport roller 20 is not limited to being made of ceramic, and may be made of metal. The transport rollers 20 are aligned at the same height so as to support the workpiece A, and are arranged in the space 10i at a predetermined pitch (see FIG. 1).

As shown in FIG. 2, the multiple transport rollers 20 are inserted into the through holes 50a, 60a of the pair of side walls 50, 60, respectively. In this embodiment, one end of one transport roller 20 is inserted into each of the multiple through holes 50a, 60a (see FIG. 2). The ends of the multiple transport rollers 20 protrude from the through holes 50a, 60a to the outside of the furnace body 10. The through holes 50a, 60a are blocked by a blanket 17 from the outside of the side walls 50, 60. This can reduce the escape of heat from the space 10i through the through holes 50a, 60a through which the transport rollers 20 are inserted.

Figure 3 is a schematic diagram showing the support structure of multiple conveying rollers 20. In Figure 3, multiple conveying rollers 20 viewed from above and multiple roller supports 30, 40 supporting the multiple conveying rollers 20 are shown. Figure 4 is a schematic diagram of roller support 30. In Figure 4, the support structure of the drive side of conveying roller 20 is shown. Figure 5 is a schematic diagram of roller support 40. In Figure 5, the support structure of the driven side of conveying roller 20 is shown. Figure 6 is a schematic diagram of roller support 30. In Figure 6, roller support 30 viewed from above is shown.

As shown in FIG. 3, the multiple conveying rollers 20 are supported by roller supports 30 and 40, respectively. Here, one end of each conveying roller 20 is supported by the roller support 30, and the other end is supported by the roller support 40. The multiple roller supports 30 and 40 are supported by support stands 35 and 45 outside the furnace body 10.

The roller supports 30, 40 and the support bases 35, 45 are provided with an attachment structure that allows the position of the roller supports 30, 40 to be adjusted along the conveying direction relative to the support bases 35, 45. The structures of the support bases 35, 45 and the roller supports 30, 40 are described below.

<Support stand 35, 45>
The support bases 35 and 45 are rail-shaped members extending along the conveying direction. The support bases 35 and 45 are provided outside the furnace body 10. The support base 35 is supported by a side wall 50 of the furnace body 10. The support base 45 is disposed at a required distance from the side wall 60 of the furnace body 10.

As shown in FIG. 4, the support base 35 is supported by the support pillars 36. Although not shown, multiple support pillars 36 are provided along the conveying direction, and each support base 35 is supported by multiple support pillars 36. The support base 35 is attached to the support pillars 36 by fixing brackets (not shown). A sprocket 34b is attached to the support base 35. A member that forms a loop path for the roller chain 34a, such as a chain guide, may be attached to the support base 35.

As shown in FIG. 5, the support table 45 is supported by the support pillars 46. Although not shown, multiple support pillars 46 are provided along the conveying direction, and each support table 45 is supported by multiple support pillars 46. The support table 45 is attached to the support pillars 46 by fixing brackets (not shown).

As shown in Figures 4 and 5, the support bases 35, 45 have a pair of legs 35a, 45a and support parts 35b, 45b. The legs 35a, 45a extend upward from the supports 36, 46. The support parts 35b, 45b connect the upper ends of the pair of legs 35a, 45a, respectively.

The support portion 35b, 45b is a flat plate-shaped portion that supports the roller support 30, 40. The upper surface of the support portion 35b, 45b is provided with a protrusion 35b1, 45b1. The protrusion 35b1, 45b1 may be formed continuously or intermittently along the conveying direction. The protrusion 35b1, 45b1 is provided at approximately the center of the width of the support portion 35b, 45b. The protrusion 35b1, 45b1 may be, for example, a protrusion provided intermittently along the conveying direction, or may be a protrusion extending along the conveying direction. The support portion 35b, 45b may be provided with a plurality of rows of protrusions 35b1, 45b1.

Two rows of holes 35b2, 45b2 are formed in the support portions 35b, 45b, respectively. The holes 35b2, 45b2 are elongated holes (see FIG. 6) extending along the conveying direction. The two rows of holes 35b2, 45b2 are provided at positions sandwiching the convex portions 35b1, 45b1 along the width direction of the support portions 35b, 45b, respectively. The dimensions of the holes 35b2, 45b2 in the width direction of the support portions 35b, 45b are set to dimensions that allow the mounting members 35b3, 45b3 to be inserted therethrough. The dimensions of the holes 35b2, 45b2 are not particularly limited. The length of the holes 35b2, 45b2 along the conveying direction may be a length that fits within the width of the roller supports 30, 40, or may be a length that spans multiple roller supports 30, 40. The holes 35b2, 45b2 may be formed intermittently in the support parts 35b, 45b, or may be formed continuously.

The roller supports 30, 40 are placed on the upper surfaces of the support bases 35, 45 (the upper surfaces of the support portions 35b, 45b in this embodiment). This makes it difficult for the roller supports 30, 40 to fall off the support bases 35, 45. The roller supports 30, 40 may be placed directly on the upper surfaces of the support bases 35, 45, or may be placed on the upper surfaces of the support bases 35, 45 via a height adjustment member 37 (see Figure 7).

Figure 7 is a schematic diagram showing a height adjustment member 37. Figure 7 shows a schematic diagram of a height adjustment member 37 interposed between the support base 35 and the roller support 30. In the embodiment shown in Figure 7, the roller support 30 is placed on the upper surface of the support base 35 via the height adjustment member 37. The height adjustment member 37 is a member that adjusts the height of the transport roller 20 by being interposed between the roller support 30 and the support base 35. The height adjustment member 37 may be provided between some of the multiple transport rollers 20 and the support base 35.

The height adjustment member 37 may be, for example, a plate-shaped member. The height adjustment member 37 may be a plate-shaped member extending along the conveying direction. The height of the roller support 30 is adjusted by adjusting the number and thickness of the height adjustment members 37 arranged between the roller support 30 and the support base 35. The shape of the height adjustment member 37 is not particularly limited. The height adjustment member may have approximately the same width as the roller support 30 or the support base 35. In this case, the height adjustment member 37 may have a hole 37a corresponding to the convex portion 35b1 of the support base 35, and a hole 37b corresponding to the hole 35b2 and the mounting member 35b3. The shapes of the holes 37a and 37b are not particularly limited as long as the convex portion 35b1 and the mounting member 35b3 can be inserted, respectively. The height adjustment member 37 is not limited to such a form. The height of the roller support 30 may be adjusted by a plurality of height adjustment members arranged at positions that do not interfere with the convex portion 35b1 and the mounting member 35b3 of the support base 35. In addition, the height of the roller support 40 may be adjusted by disposing the height adjustment member 37 described above between the support base 45 and the roller support 40.

<Multiple Roller Supports 30, 40>
As shown in Fig. 3, the multiple roller supports 30, 40 each support one end of one of the multiple transport rollers 20. Both ends of the multiple transport rollers 20 adjacent to each other in the transport direction are supported by the roller supports 30, 40, respectively. The roller support 30 supports the end 21 of the transport roller 20 protruding from the through hole 50a of the side wall 50. The roller support 40 supports the end 22 of the transport roller 20 protruding from the through hole 60a of the side wall 60.

The roller supports 30, 40 are arranged intermittently outside the furnace body 10 along the direction in which the transport rollers 20 are arranged (the transport direction). In other words, on both sides of the width of the furnace body 10, the roller supports 30, 40 supporting the transport rollers 20 are arranged with gaps between them along the transport direction. The roller supports 30, 40 are attached to support bases 35, 45.

<Roller Support 30>
4, each of the roller supports 30 includes a housing 31, a bearing 32, and a shaft 33. One end (end 21) of each of the conveying rollers 20 is supported with one end of the shaft 33 of the roller support 30 inserted therein.

<Housing 31>
The housing 31 is a member that supports the shaft 33 via the bearing 32. The housing 31 is made of metal and can be formed of, for example, stainless steel, aluminum, aluminum alloy, carbon steel, etc. In this embodiment, the housing 31 has a rectangular prism shape. The housing 31 is arranged on the support base 35 so that the length along the width direction of the furnace body 10 is longer than the length in other directions. In other words, the housing 31 is arranged on the support base 35 with the surface with the narrowest area facing the furnace body 10. The shape of the housing 31 is not particularly limited, and may be a prism shape other than a rectangular prism, or may have a shape including a curved surface. The housing 31 may be a box-shaped one composed of a plurality of plates, or may be a U-shaped or L-shaped one. From the viewpoint of ease of processing and strength, it is preferable that the housing has a rectangular prism shape.

The housing 31 is placed on the support base 35. In this embodiment, the housing 31 of the roller support 30 has a portion corresponding to the convex portion 35b1 on the upper surface of the support portion 35b. A recess 31b is formed on the lower surface of the housing 31 into which the convex portion 35b1 of the support base 35 fits. As shown in FIG. 6, the recess 31b is a groove extending along the conveying direction. The dimensions of the recess 31b of the housing 31 correspond to the dimensions of the convex portion 35b1 of the support base 35. In the width direction of the support base 35 (the width direction of the furnace body 10), the recess 31b of the housing 31 is set to a dimension into which the convex portion 35b1 of the support base 35 fits. In this embodiment, in the width direction of the support base 35, the recess 31b of the housing 31 is set to a dimension slightly larger than the convex portion 35b1 of the support base 35. By providing the recess 31b in the housing 31, when the recess 31b of the housing 31 fits into the protrusion 35b1 of the support base 35, the roller support 30 is prevented from shifting in the width direction relative to the support base 35. Note that the housing 31 and the support base 35 do not necessarily have to have corresponding recesses 31b and protrusions 35b1. A protrusion may be provided on the housing, and a recess corresponding to the protrusion may be provided on the support plate.

The housing 31 of the roller support 30 has a mounting hole 31a to which the mounting member 35b3 is attached. The roller support 30 is attached to the support base 35 by the mounting member 35b3 with the recess 31b of the housing 31 fitted into the protrusion 35b1 of the support base 35. The roller support 30 is detachably attached to the support base 35 by the mounting member 35b3 inserted into the hole 35b2. For example, a bolt or the like can be used as the mounting member 35b3. The hole 35b2 to which the mounting member 35b3 is attached is an elongated hole along the conveying direction. Therefore, even when the roller support 30 is moved along the conveying direction, the mounting member 35b3 attached to the mounting hole 31a of the roller support 30 moves along the hole 35b2. After the roller support 30 is moved along the conveying direction with the mounting member 35b3 loosened or removed, the roller support 30 can be fixed by the mounting member 35b3. This allows the position of the roller support 30 to be adjusted. The position of the roller support 30 can be adjusted at any desired time, such as when the continuous heating furnace 1 is installed, during maintenance after operation, or during operation.

As shown in FIG. 4, the housing 31 is formed with a through hole 31c through which the shaft 33 is inserted. The through hole 31c is a hole that opens in a substantially cylindrical shape in the center of the housing 31. The through hole 31c penetrates the center of the housing 31 along the length of the housing 31 (the width direction of the furnace body 10). In addition, a pair of recesses 31d are formed at both ends in the length direction of the housing 31. The recesses 31d are portions whose inner diameter is wider than that of the through hole 31c. The recesses 31d are formed in a substantially disk shape. A bearing 32 is attached to the recesses 31d.

<Bearing 32>
The bearing 32 is a member that rotatably supports the shaft 33. The bearing 32 is attached to the housing 31. The bearing 32 is fitted into a pair of recesses 31d formed in the housing 31. At both ends of the housing 31, the bearing 32 partially protrudes from the recess 31d. A groove is provided in the portion of the bearing 32 that protrudes from the recess 31d. The bearing 32 is attached to the housing 31 by attaching a holding member 32a to the groove in a state in which the bearing 32 is fitted into the recess 31d of the housing 31. Although not particularly limited, the holding member 32a may be a fastener such as an annular or pin-shaped member. The shaft 33 is inserted through the bearing 32 and the through hole 31c of the housing 31. A spacer may be provided between the inner peripheral surface of the housing 31 and the shaft 33.

<Shaft 33>
The shaft 33 is rotatably supported by the bearing 32. At least one end of the shaft 33 protrudes from the housing 31. In this embodiment, the shaft 33 is inserted into the through hole 31c of the housing 31. The housing 31 surrounds the periphery of the shaft 33. This makes it difficult for dust, dirt, etc. to get between the shaft 33 and the housing 31, and prevents the shaft 33 from rotating due to the inclusion of foreign matter. Both ends of the shaft 33 protrude from the housing 31. The shaft 33 includes a base end 33a, a spring seat portion 33b, an insertion portion 33c, and a support portion 33d. The base end 33a is a portion attached to the bearing 32. The outer diameter of the base end 33a is approximately the same as the inner diameter of the bearing 32. The length of the base end 33a is longer than the length of the housing 31. Therefore, one end of the base end 33a protrudes outward from the housing 31. A sprocket 34 is attached to one end of the base end 33a that protrudes from the housing 31. A spring seat 33b is connected to the other end of the base end 33a.

The spring seat 33b is provided on the shaft 33 at a portion that protrudes from the housing 31. The spring seat 33b is disposed inside the housing 31 (toward the side wall 50 of the furnace body 10). The spring seat 33b is a generally disk-shaped portion with an outer diameter larger than that of the base end 33a. The spring seat 33b is the portion against which one end of the coil spring 25 abuts. An insertion portion 33c extends from the spring seat 33b.

The insertion portion 33c is a portion through which the coil spring 25 is inserted. The insertion portion 33c extends from the spring seat portion 33b toward the side wall 50 of the furnace body 10. The outer diameter of the insertion portion 33c is smaller than the outer diameter of the spring seat portion 33b. The outer diameter of the insertion portion 33c is smaller than the inner diameter of the coil spring 25 through which it is inserted. In this embodiment, the outer diameter of the insertion portion 33c on the base end side (spring seat portion 33b side) is approximately the same as the inner diameter of the coil spring 25. This makes it easier for the coil spring 25 to be fixed to the shaft 33, and makes it difficult for the coil spring 25 to shift position. A step is formed in the insertion portion 33c so that it becomes thinner toward the tip side. A support portion 33d is provided at the tip of the insertion portion 33c.

The support portion 33d is a portion that supports the conveying roller 20. The support portion 33d is inserted into the hollow conveying roller 20. A portion of the tip of the insertion portion 33c can also be inserted into the conveying roller 20. The support portion 33d inserted into the conveying roller 20 supports the conveying roller 20 from the inside. The outer diameter of the support portion 33d is slightly smaller than the inner diameter of the conveying roller 20. This makes it difficult for a large load to be placed on these components even if the conveying roller 20 and the shaft 33 thermally expand as the continuous heating furnace 1 operates.

The conveying roller 20 is supported by the shaft 33 via a coil spring 25. The coil spring 25 is disposed between the conveying roller 20 and the spring seat 33b of the shaft 33. Here, a coil spring 25 with a natural length longer than the gap between the conveying roller 20 and the spring seat 33b of the shaft 33 is used. Therefore, both ends of the coil spring 25 abut against the end 21 of the conveying roller 20 and the spring seat 33b of the shaft 33, respectively. The elastic force of the compressed coil spring 25 acts on the end 21 of the conveying roller 20 and the spring seat 33b. As a result, the conveying roller 20 rotates in conjunction with the rotation of the shaft 33.

As described above, a sprocket 34 is attached to the end of the shaft 33 opposite the conveying roller 20 across the housing 31 (the end of the base end 33a). A roller chain 34a is wound around the sprocket 34. Although detailed illustration is omitted, the roller chain 34a is formed in a ring shape. As shown in FIG. 3, the roller chain 34a is wound around the sprockets 34 attached to the shafts 33 of the multiple roller supports 30. A chain guide (not shown) is provided below the multiple sprockets 34. The roller chain 34a may be wound around a sprocket 34b that sets the loop path of the roller chain 34a, in addition to the sprocket 34. The roller chain 34a is connected to a drive device (not shown) with the required tension applied. For example, a motor or the like can be used as the drive device. The drive device may be connected to the roller chain 34a via a reducer, a clutch, a coupling, or the like. The roller chain 34a rotates by the power of the drive device. The sprockets 34 attached to the shafts 33 of the roller supports 30 rotate in conjunction with the roller chains 34a, causing the shafts 33 to rotate. The elastic force of the compressed coil springs 25 acts on the spring seat 33b of the shafts 33 and the ends 21 of the transport rollers 20. Therefore, the rotation of the shafts 33 is transmitted to the transport rollers 20 via the coil springs 25, and the transport rollers 20 rotate in conjunction with the shafts. This causes the multiple transport rollers 20 to rotate at approximately the same timing and speed. In this way, the multiple transport rollers 20 are driven from the end 21 side on the side of the side wall 50.

The ends 22 of the multiple conveying rollers 20 on the side wall 60 side are supported by the roller support 40. The ends 22 of the multiple conveying rollers 20 are supported by the roller support 40 so as to rotate following the rotation of the ends 21 on the side wall 50 side.

<Roller Support 40>
5, like the roller support 30, the roller support 40 includes a housing 41, a bearing 42, and a shaft 43. One end (end 22) of each of the plurality of conveying rollers 20 is supported with one end of the shaft 43 of the roller support 40 inserted therein. The roller support 40 can be configured in the same manner as the roller support 30, and therefore a detailed description thereof will be omitted.

The housing 41 has a mounting hole 41a to which the mounting member 45b3 is attached. The housing 41 has a through hole 41c. A pair of recesses 41d are formed at both ends of the housing 41 in the longitudinal direction. A bearing 42 is attached to the recess 41d. The bearing 42 is attached to the housing 41 by a holding member 42a. The shaft 43 is rotatably supported by the bearing 42. In this embodiment, both ends of the shaft 43 protrude from the housing 41. The shaft 43 has a base end 43a, a spring seat 43b, an insertion portion 43c, and a support portion 43d. A compressed coil spring 25 is disposed between the spring seat 43b and the end 22 of the conveying roller 20. This allows the shaft 43 and the conveying roller 20 to rotate in conjunction with each other.

The shaft 43 of the roller support 40 does not have a sprocket 34 attached thereto for transmitting the power of the drive unit, as was attached to the shaft 33 of the roller support 30 (see Figures 4 and 5). Therefore, the shaft 43 rotates following the rotation of the shaft 33 and the transport roller 20. In this way, the workpiece A is transported along the transport direction by the rotation of the transport roller 20. As shown in Figure 1, the continuous heating furnace 1 is provided with multiple treatment chambers (treatment chambers R1 and R2 in the embodiment shown in Figure 1). The workpiece A is treated in treatment chamber R1 and then in treatment chamber R2.

<Processing chambers R1, R2>
The processing chambers R1 and R2 are adjacent to each other along the transport direction. The processing chambers R1 and R2 can be set to different atmospheres. Therefore, the processing chambers R1 and R2 can process the workpiece A under different conditions. The spaces 10i in the processing chambers R1 and R2 can be set to different atmospheric temperatures. The spaces 10i in the processing chambers R1 and R2 can be set to introduce different atmospheric gases. A partition wall 90 is provided between the processing chambers R1 and R2. The atmospheres of the processing chambers R1 and R2 can be separated by the partition wall 90. The partition wall 90 includes shutters 91 and 92, a case 93, and a shutter opening/closing device 95. Two adjacent transport rollers 20a are provided at the positions where the shutters 91 and 92 are provided. Here, the two adjacent transport rollers 20a are provided at positions where they overlap the shutters 91 and 92 in the vertical direction. The transport rollers 20a are supported by roller supports 30 and 40. The transport rollers 20a are configured so that their positions can be adjusted individually.

By providing a plurality of processing chambers R1, R2 separated by the partition wall 90, the temperature can be changed stepwise along the transport direction. For example, the atmospheric temperature of the space 10i in the furnace body 10 can be gradually raised toward the target processing temperature, or gradually lowered from the processing temperature. In addition, a gas inlet pipe 18 and a gas exhaust pipe 19 may be provided in each processing chamber R1, R2 so that a different atmospheric gas is introduced into each processing chamber R1, R2 separated by the partition wall 90. The gas inlet pipe 18 is a pipe through which a predetermined atmospheric gas is introduced into the processing chambers R1, R2. A gas cylinder (not shown) or the like may be connected to the gas inlet pipe 18 so that a different atmospheric gas is introduced into each processing chamber R1, R2. For example, nitrogen, argon, air, hydrogen, oxygen, carbon dioxide, and a mixture thereof may be used as the atmospheric gas. Chlorine, hydrogen chloride, ammonia, etc. may be used as the atmospheric gas. The gas exhaust pipe 19 is a pipe for exhausting the atmospheric gas in the processing chambers R1 and R2. The gas exhaust pipe 19 may be connected to an exhaust system such as an exhaust pump (not shown). The exhaust system may be connected to a solvent recovery device for recovering the solvent, a combustion device for burning the solvent, or the like. The continuous heating furnace 1 is not limited to the form in which the two processing chambers R1 and R2 shown in FIG. 1 are provided, and three or more processing chambers separated by partitions may be provided.

The processing chambers R1 and R2 may each be provided with a gas sensor that detects the atmospheric gas in the processing chamber. When the atmospheric gas in the processing chambers R1 and R2 differs from the predetermined atmospheric gas composition, the event may be notified to a predetermined notification destination. In addition, when the temperature detected by the above-mentioned temperature sensor is not appropriate, the predetermined notification destination may also be notified. The method of notification is not particularly limited, and may be notified by a notification lamp provided on the outside of the furnace body 10, may be notified by an alarm sound, may be notified by displaying on a display showing the operating status of the continuous heating furnace 1, or may be notified to a terminal used for managing the continuous heating furnace 1. In this way, an abnormality in the atmosphere in which the workpiece A is processed may be detected and notified by a sensor (gas sensor, temperature sensor, pressure sensor, etc.), and the operator may recognize the occurrence of the abnormality.

<Shutters 91, 92>
The shutters 91 and 92 separate the space 10i of the processing chambers R1 and R2 in the transport direction. The shutters 91 and 92 can be made of a plate-shaped heat insulating material. The shutters 91 and 92 form a partition wall 90 provided between the processing chambers R1 and R2. The shutters 91 and 92 are substantially rectangular plate-shaped members. The shutters 91 and 92 are arranged so that their wide surfaces face the transport direction. In the width direction of the furnace body 10, the dimensions of the shutters 91 and 92 are substantially the same (see FIG. 2). The thicknesses of the shutters 91 and 92 are substantially the same. In this embodiment, the thickness of the shutters 91 and 92 is larger than the gap between the adjacent transport rollers 20a. The dimensions of the shutters 91 and 92 are not particularly limited.

The shutters 91 and 92 are provided at the same position in the transport direction. The lower end of the shutter 91 and the upper end of the shutter 92 face each other in the up-down direction. In this embodiment, the shutter 92 is fixed to the lower part of the furnace body 10. The shutter 92 extends upward from the bottom wall 70. The upper end of the shutter 92 reaches between the adjacent transport rollers 20a. The upper end of the shutter 92 reaches a position higher than the lower end of the transport roller 20a. This makes it difficult for the atmosphere to interfere between the processing chambers R1 and R2 from below the transport roller 20a, making it easier to maintain the atmosphere in the processing chambers R1 and R2.

Figure 8 is a schematic diagram showing the shutters 91, 92. In Figure 8, the open shutters 91, 92 are shown in solid lines, and the closed shutters 91, 92 are shown in two-dot chain lines. As shown in Figure 8, the upper part of the shutter 92 has a portion 92a that is inserted between adjacent transport rollers 20a (hereinafter also referred to as "insertion portion 92a"). The insertion portions 92a of the shutter 92 are recessed along the transport rollers 20a. In this way, the shape of the shutter 92 is designed to reduce the gap between the shutter 92 and the transport roller 20a, which makes it less likely for the atmospheres to interfere with each other between the processing chambers R1, R2.

When the shutters 91 and 92 are open, a gap is provided between the shutter 91 and the transport roller 20a that allows at least the workpiece A to be transported. In this embodiment, when the shutters 91 and 92 are closed, the lower end of the shutter 91 reaches between adjacent transport rollers 20a. The lower part of the shutter 91 is provided with a portion 91a (hereinafter also referred to as "insertion portion 91a") that is inserted between adjacent transport rollers 20a among the multiple transport rollers 20 when the shutters 91 and 92 are closed.

In this embodiment, the insertion portion 91a of the shutter 91, like the upper portion of the shutter 92, is shaped to fit the two adjacent transport rollers 20a. The front and rear portions of the upper portion of the shutter 91 are recessed along the transport rollers 20a. Because the insertion portion 91a on the lower portion of the shutter 91 has such a shape, the gap between the shutter 91 and the transport rollers 20a is smaller when the shutters 91 and 92 are closed. This makes it less likely that the atmospheres will interfere with each other between the processing chambers R1 and R2.

The shutter 91 is driven vertically by the shutter opening/closing device 95. When the shutter 91 is driven downward, the shutters 91 and 92 are closed. When the shutter 91 is driven upward, the shutters 91 and 92 are opened.

As shown in FIG. 2, in this embodiment, the shutter opening/closing device 95 includes a pair of support rods 95a and a cylinder 95b. The support rod 95a is a cylindrical shaft member extending along the height direction. The pair of support rods 95a support the left and right ends of the shutter 91 in the space 10i inside the furnace body 10, respectively. The support rod 95a is inserted into a through hole provided in the bottom wall 70 and extends downward from the furnace body 10. The lower parts of the pair of support rods 95a are connected by a connecting bar 95c outside the furnace body 10. Both ends of the connecting bar 95c are attached to guides 95d extending downward from the outer surface of the bottom wall 70 via linear bushings 95e. The connecting bar 95c is connected to the cylinder 95b.

The cylinder 95b is a device that raises and lowers the connecting bar 95c via a piston rod. The cylinder 95b is attached to the outer surface of the bottom wall 70. The cylinder 95b is provided at approximately the center in the width direction of the furnace body 10. The connecting bar 95c is connected to the tip of the piston rod of the cylinder 95b. When the piston rod of the cylinder 95b is pulled up, the connecting bar 95c rises and the shutter 91 rises. When the piston rod of the cylinder 95b is pushed down, the connecting bar 95c falls and the shutter 91 falls. The interval when the shutters 91 and 92 are opened and the interval when the shutters 91 and 92 are closed may be appropriately set by operating the shutter opening and closing device 95. In this embodiment, the cylinder 95b is used for the shutter opening and closing device 95, but this is not limited to such a form. For example, a device that raises and lowers the shutter 91 up and down by the rotation of a motor may be used as the shutter opening and closing device 95.

The opening and closing of the shutters 91 and 92 is appropriately set according to the processing conditions of the workpiece A. The opening and closing of the shutters 91 and 92 may be linked to the transport of the workpiece A by the transport rollers 20, for example, as follows. When the workpiece A is transported by the rotation of the transport rollers 20, the shutters 91 and 92 are opened. When the workpiece A is transported to the processing chamber R1, the rotation of the transport rollers 20 is stopped. When the rotation of the transport rollers 20 is stopped, the shutters 91 and 92 are closed. The processing chambers R1 and R2 are brought to a predetermined atmosphere, and the workpiece A is processed in the processing chamber R1 under predetermined processing conditions. When the processing in the processing chamber R1 is completed, the shutters 91 and 92 are opened and the transport rollers 20 rotate. The workpiece A is transported to the processing chamber R2. When the workpiece A is transported to the processing chamber R2, the rotation of the transport rollers 20 is stopped. When the rotation of the transport roller 20 is stopped, the shutters 91 and 92 are closed. The processing chambers R1 and R2 are filled with a predetermined atmosphere, and the workpiece A is processed in the processing chamber R2 under predetermined processing conditions. The opening and closing of the shutters 91 and 92 and the rotation and stopping of the transport roller 20 can be repeated so that the workpiece A is transported and processed in sequence.

In this embodiment, the shutters 91 and 92 are surrounded by a case 93 in the front-rear and left-right directions (see Figs. 1 and 2). The case 93 is made of a plate-shaped insulating material. The case 93 is substantially prismatic and extends upward from the bottom wall 70. The height of the case 93 is set to a height that can cover the bottom wall 70 to the ceiling wall 80. As a result, even when the shutter 91 is driven downward, no gap is formed between the shutter 91 and the ceiling wall 80, and atmospheric interference is unlikely to occur. A space is provided inside the case 93 to accommodate the shutters 91 and 92. The inner dimensions and shape of the case 93 may be determined according to the dimensions and dimensions of the shutters 91 and 92. The inner wall surface of the case 93 may be provided with a guide that guides the shutters 91 and 92 in the up-down direction. The case 93 is provided with a through hole through which the conveying roller 20a is inserted. The through hole penetrates the side of the case 93 along the width direction of the furnace body 10. The case 93 has a through hole 93a through which the workpiece A passes in the transport direction (see FIG. 8). The through hole 93a is generally rectangular. The through hole 93a passes through the front and rear surfaces of the case 93. The configuration of the case 93 is not limited to the above-mentioned form. Also, the case 93 does not necessarily have to be provided.

According to the inventor's knowledge, when the temperature inside the continuous heating furnace rises during operation, the temperature of the transport roller rises and the transport roller expands. In addition, the weight of the transported object may place a load on the transport roller. For this reason, there is a concern that the dimensions of the transport roller may change or the transport roller may deform during operation of the continuous heating furnace. If the transport roller is deformed in a continuous heating furnace provided with a shutter, the shutter may hit the transport roller when it is closed. In such a case, the shutter may not be properly closed. If the shutter is not properly closed, for example, there is a possibility that the atmosphere may interfere between the processing chambers separated by the shutter. If the atmosphere interferes between the processing chambers, the atmosphere may not be maintained and the conditions under which the workpiece is processed may change.

In the above-described embodiment, the continuous heating furnace 1 includes a tunnel-shaped furnace body 10 that encloses a space 10i along a predetermined conveying direction, a plurality of conveying rollers 20 that cross the tunnel-shaped furnace body 10 and are arranged along the conveying direction, shutters 91, 92 that separate the space 10i in the conveying direction, and a shutter opening/closing device 95. The conveying rollers 20a arranged at the positions where the shutters 91, 92 are provided are configured to be individually position adjustable. Therefore, when the conveying rollers 20a and the shutters 91, 92 interfere with each other, the position, angle, etc. of the conveying rollers 20a can be adjusted so that the shutters 91, 92 are appropriately closed. Such position adjustment of the roller supports 30, 40 is possible even during operation of the continuous heating furnace 1.

In the above-described embodiment, the ends 21, 22 of the conveying roller 20 arranged at the positions where the shutters 91, 92 are provided are supported by roller supports 30, 40 configured to be position adjustable. The position of the conveying roller 20 can be adjusted by adjusting the positions of the roller supports 30, 40 outside the furnace body 10. Therefore, the position of the conveying roller 20 can be adjusted even while the continuous heating furnace 1 is in operation, making it easy to eliminate interference between the shutters 91, 92 and the conveying roller 20a.

According to the inventor's knowledge, erroneous detection of the conveying roller may also occur when the conveying roller deteriorates due to long-term use of the continuous heating furnace. The temperature of the conveying roller rises and falls with temperature changes due to operation and stop of the continuous heating furnace. The conveying roller repeatedly expands and contracts with the rise and fall of temperature. The dimensions of the conveying roller may change or be deformed due to long-term use of the continuous heating furnace. For this reason, the conveying roller needs to be inspected and replaced periodically, such as during maintenance of the continuous heating furnace. In addition, not only the conveying roller, but also each equipment of the continuous heating furnace, such as the furnace body and shutter, may change in dimensions or be deformed due to long-term use. In such a case, even if the deteriorated conveying roller is replaced, the conveying roller may interfere with the furnace body, shutter, etc. due to deformation of the furnace body and shutter. In the above-mentioned embodiment, the conveying roller 20 is individually supported by the roller supports 30 and 40, making it easy to adjust the position of the conveying roller 20 individually. Therefore, it is easy to eliminate interference between the furnace body 10, the shutters 91 and 92, and the conveying roller 20.

In the above-described embodiment, the continuous heating furnace 1 is provided with a pair of support tables 35, 45. The pair of support tables 35, 45 each extend along the conveying direction and are provided outside the furnace body 10 in the width direction of the furnace body 10 (see Figures 3 and 6). A plurality of roller supports 30, 40 are attached to the pair of support tables 35, 45 (see Figures 4 and 5). The roller supports 30, 40 and the support tables 35, 45 are provided with an attachment structure that allows the position of the roller supports 30, 40 to be adjusted along the conveying direction relative to the support tables 35, 45. With this configuration, the position of the conveying roller 20 can be adjusted outside the furnace body 10, improving the workability of the position adjustment.

In the above-described embodiment, the support base 35, 45 has a convex portion 35b1, 45b1 at the portion where the roller support 30, 40 is attached. The housing 31, 41 of the roller support 30, 40 has a concave portion 31b, 41b formed therein into which the convex portion 35b1, 45b1 fits. By fitting the convex portion 35b1, 45b1 of the support base 35, 45 into the concave portion 31b, 41b of the roller support 30, 40, the roller support 30, 40 is less likely to shift in the width direction when the position of the roller support 30, 40 is adjusted. This allows for good workability when adjusting the position of the roller support 30, 40.

In the above-described embodiment, the recesses 31b, 41b are grooves extending along the conveying direction. This allows the roller supports 30, 40 to slide along the conveying direction with the protrusions 35b1, 45b1 inserted into the groove-shaped recesses 31b, 41b. The protrusions 35b1, 45b1 are guided by the groove-shaped recesses 31b, 41b, so that the position in the width direction is less likely to shift, and the position of the roller supports 30, 40 can be easily adjusted along the conveying direction.

The roller supports 30, 40 may be attached to the support bases 35, 45 in a state in which they are placed on the upper surfaces of the support bases 35, 45 via height adjustment members 37. By using the height adjustment members 37, not only the position and angle along the conveying direction but also the height of the conveying rollers 20 can be adjusted. This can improve the degree of freedom in adjusting the position, angle, etc. of the conveying rollers 20.

In the above-described embodiment, the shutter 92 is fixed to the furnace body 10, and the shutter 91 is opened and closed by the shutter opening and closing device 95 when opening and closing. However, as long as the distance between the shutters 91 and 92 changes in the vertical direction when opening and closing, the driving pattern of the shutters 91 and 92 is not limited to the above-described form. For example, the shutter opening and closing device 95 may be configured to drive both the shutters 91 and 92. When the shutters 91 and 92 are open, the shutter 91 may be held above the conveying roller 20, and the shutter 92 may be held below the conveying roller 20. When the shutters 91 and 92 are closed, the shutter 91 may be configured to descend and the shutter 92 to ascend.

The shutter may be provided only above the transport roller (top of the furnace body). Although not particularly limited, if the space between the transport roller and the bottom wall of the furnace body is narrow, the shutter may be provided only above. In addition, a partition or step that separates the atmosphere between the processing chambers may be provided below the shutter.

The dimensions of the shutter are not particularly limited. The thickness of the shutter may be thinner than the gap between adjacent transport rollers. When the shutter is closed, the shutter may pass between adjacent transport rollers. In such a case, interference between adjacent transport rollers and the shutter passing between the adjacent transport rollers can be reduced.

The shutter may be provided only below the transport rollers (above the furnace body). Although not particularly limited, a shutter thinner than the gap between adjacent transport rollers may be provided below the transport rollers, and when the shutter closes, the shutter rises from between the adjacent transport rollers to separate the atmosphere between the processing chambers.

The shape of the shutters 91, 92 is not limited to the shape having the insertion portions 91a, 92a described above. If the shutter is not inserted between adjacent transport rollers, the upper end and the lower end of the shutter may be substantially flat. The shutter may also have a recess that can accommodate the transport roller. For example, the shutter may be provided in a position that covers the transport roller in the vertical direction, and the transport roller may be accommodated in the recess of the shutter by driving the shutter.

Although a detailed description has been given above using specific embodiments, these are merely examples and do not limit the scope of the claims. In this way, the technology described in the claims includes various modifications and variations of the embodiments described above.

This specification includes the following items 1 to 10. Items 1 to 10 below are not limited to the above-described embodiments.

A tunnel-shaped furnace body that encloses a space along a predetermined conveying direction;
A plurality of conveying rollers arranged along the conveying direction and crossing the tunnel-shaped furnace body,
a shutter that separates the space in the conveying direction;
A shutter opening/closing device,
At least one conveying roller arranged at the position where the shutter is provided is configured to be individually position adjustable.
Continuous heating furnace.

Item 2:
Item 2. The continuous heating furnace according to item 1, wherein an end of at least one of the conveying rollers arranged at the position where the shutter is provided is supported by a plurality of roller supports configured to be position adjustable.

Item 3:
Further comprising a pair of support bases;
The pair of support tables each extend along the conveying direction and are provided outside the furnace body in the width direction of the furnace body,
The roller supports are each attached to one of the pair of support bases,
3. The continuous heating furnace according to item 2, wherein the roller support and the support base are provided with an attachment structure that allows the position of the roller support to be adjusted relative to the support base along the conveying direction.

Item 4:
Each of the plurality of conveying rollers is a hollow shaft member,
The plurality of roller supports include
a housing; a bearing attached to the housing;
a shaft rotatably supported by the bearing and having at least one end protruding from the housing,
4. The continuous heating furnace according to item 3, wherein both ends of at least one of the plurality of conveying rollers are supported in a state in which one end of the shaft of the roller support is inserted therein.

Item 5:
the support base has a protrusion at a location where the roller support is attached,
5. The continuous heating furnace according to item 4, wherein the housing of the roller support has a recess formed therein into which the protrusion fits.

Clause 6:
6. The continuous heating furnace according to item 5, wherein the recess is a groove extending along the conveying direction.

Clause 7:
7. The continuous heating furnace according to any one of claims 3 to 6, wherein the roller support is attached to the support table in a state in which the roller support is placed on an upper surface of the support table.

Clause 8:
8. The continuous heating furnace according to item 7, wherein the roller support is attached to the support table in a state in which the roller support is placed on the upper surface of the support table via a height adjustment member.

Clause 9:
Item 9. The continuous heating furnace according to item 8, wherein the height adjustment member is plate-shaped.

Item 10:
The support base has a hole formed along the conveying direction,
The housing of the roller support has a mounting hole formed therein,
Item 10. The continuous heating furnace according to any one of items 4 to 9, wherein the roller support is attached to the support base by an attachment member inserted into the hole and the attachment hole.

A Workpieces R1, R2 Processing chamber 1 Continuous heating furnace 10 Furnace body 10i Space 12 Heater 18 Gas inlet pipe 19 Gas exhaust pipe 20, 20a Conveyor rollers 21, 22 End 25 Coil spring 30, 40 Roller support 31, 41 Housing 31a, 41a Mounting hole 31b, 41b Recess 31c, 41c Through hole 31d, 41d Depression 32, 42 Bearing 33, 43 Shaft 33a, 43a Base end 33b, 43b Seat 33c, 43c Insertion portion 33d, 43d Support portion 34 Sprocket 34a Roller chain 35, 45 Support stand 35a, 45a Leg 35b, 45b Support portion 35b1, 45b1 Convex portion 35b2, 45b2 Hole 35b3, 45b3 Mounting member 36, 46 Support 37 Height adjustment member 50, 60 Side wall 50a, 60a Through hole 90 Partition 91, 92 Shutters 91a, 92a Insertion portion 93 Case 95 Shutter opening/closing device

Claims (10)

A tunnel-shaped furnace body that encloses a space along a predetermined conveying direction;
A plurality of conveying rollers arranged along the conveying direction and crossing the tunnel-shaped furnace body,
a shutter that separates the space in the conveying direction;
A shutter opening/closing device,
At least one conveying roller arranged at a position where the shutter is provided is configured to be individually position adjustable,
an end portion of at least one conveying roller arranged at a position where the shutter is provided is supported by a plurality of roller supports configured to be positionally adjustable along the conveying direction;
Continuous heating furnace. A tunnel-shaped furnace body that encloses a space along a predetermined conveying direction;
A plurality of conveying rollers arranged along the conveying direction and crossing the tunnel-shaped furnace body,
A pair of supports;
a shutter that separates the space in the conveying direction;
A shutter opening/closing device,
At least one conveying roller arranged at a position where the shutter is provided is configured to be individually position adjustable,
an end portion of at least one conveying roller disposed at a position where the shutter is provided is supported by a plurality of roller supports configured to be position adjustable;
The pair of support tables each extend along the conveying direction and are provided outside the furnace body in the width direction of the furnace body,
The roller supports are each attached to one of the pair of support bases,
The roller support and the support base are provided with an attachment structure that allows the position of the roller support to be adjusted along the conveying direction relative to the support base.
Continuous heating furnace. Further comprising a pair of support bases;
The pair of support tables each extend along the conveying direction and are provided outside the furnace body in the width direction of the furnace body,
The roller supports are each attached to one of the pair of support bases,
2. The continuous heating furnace according to claim 1 , wherein the roller support and the support base are provided with an attachment structure that enables the position of the roller support to be adjusted relative to the support base along the conveying direction. Each of the plurality of conveying rollers is a hollow shaft member,
The plurality of roller supports include
a housing; a bearing attached to the housing;
a shaft rotatably supported by the bearing and having at least one end protruding from the housing,
4. The continuous heating furnace according to claim 2 , wherein both ends of at least one of the plurality of transport rollers are supported with one end of the shaft of the roller support member inserted therein. the support base has a protrusion at a location where the roller support is attached,
5. The continuous heating furnace according to claim 4, wherein the housing of the roller support body is formed with a recess into which the protrusion fits. The continuous heating furnace according to claim 5, wherein the recess is a groove extending along the conveying direction. 4. The continuous heating furnace according to claim 2 , wherein the roller support is attached to the support table in a state in which the roller support is placed on an upper surface of the support table. The continuous heating furnace according to claim 7, wherein the roller support is attached to the support table while being placed on the upper surface of the support table via a height adjustment member. The continuous heating furnace according to claim 8, wherein the height adjustment member is plate-shaped. The support base has a hole formed along the conveying direction,
The housing of the roller support has a mounting hole formed therein,
5. The continuous heating furnace according to claim 4, wherein the roller support is attached to the support table by a mounting member inserted through the hole and the mounting hole.

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