Firing container and firing furnace

Abstract

When the material to be processed is placed in a firing container and fired, the material to be processed is fired more appropriately. [Solution] The firing container 1 comprises a container body 10 having an opening 10a on one side, and a lid 50 that is attached to the container body 10 so as to close the opening 10a. The container body 10 has a bottom wall 12 and a side wall 14. The bottom wall 12 faces the opening 10a. The side wall 14 is connected to the bottom wall 12 and extends from the bottom wall 12. The lid 50 is configured to be attached to the inner circumferential surface 14b of the side wall 14. An outer circumferential step portion 18 is formed on the outer circumferential surface 14a of the side wall 14.

Description

[Technical Field]

[0001] The present invention relates to a firing container and a firing furnace. [Background Art]

[0002] International Publication No. 2024 / 176061 discloses a manufacturing apparatus comprising: a cylindrical furnace core tube; a gas supply means for forming an oxygen atmosphere inside the furnace core tube; a container having a curved outer periphery; a lid that seals the internal space of the container; a heating means arranged around the furnace core tube; and a means for applying vibration to the furnace core tube and the container. The container is arranged in contact with the inner wall of the furnace core tube. The material of the container is the same as the material of the lid. The material of the furnace core tube is different from the material of the container. The container in contact with the inner wall of the furnace core tube rotates as the furnace core tube rotates. The means for applying vibration to the furnace core tube and the container applies vibration to the furnace core tube and the container to agitate the material accommodated inside the container.

[0003] International Publication No. 2024 / 209329 discloses a firing container comprising a lid made of a heat-resistant material and a container having an opening. The lid and the container are formed of the same material. A closed space is formed by combining the lid and the container. When the opening of the container is closed with the lid, the contact area between the lid and the container is the side surface of the lid and the inner wall of the container. International Publication No. 2024 / 209329 also discloses a firing container wherein, in the contact area between the lid and the container when the opening of the container is closed with the lid, the area of the surface where no irregularities are provided is larger than the area occupied by the irregularities. Furthermore, International Publication No. 2024 / 209329 discloses a firing container wherein two convex portions are provided on the side surface of the lid, and two L-shaped grooves are provided on the inner peripheral surface of the container. [Prior Art Literature] [Patent Literature]

[0004] [Patent Literature 1] International Publication No. 2024 / 176061 [Patent Literature 2] International Publication No. 2024 / 209329 [Overview of the project] [Problems that the invention aims to solve]

[0005] The inventors of this invention aim to enable more appropriate firing of materials when they are placed in a firing container and fired. [Means for solving the problem]

[0006] The firing container disclosed herein comprises a container body having an opening on one side and a lid attached to the container body so as to close the opening. The container body has a bottom wall facing the opening and a side wall connected to the bottom wall and extending from the bottom wall. The lid is configured to be attached to the inner circumferential surface of the side wall. An outer circumferential step is formed on the outer circumferential surface of the side wall. When a workpiece is fired using this firing container, the workpiece can be fired more appropriately. [Brief explanation of the drawing]

[0007] [Figure 1] Figure 1 is a schematic diagram of the firing furnace 100. [Figure 2] Figure 2 is a cross-sectional view taken along line II-II in Figure 1. [Figure 3] Figure 3 is a schematic front cross-sectional view of the firing container 1. [Figure 4] Figure 4 is a front cross-sectional view showing an enlarged view of the area around the opening 10a of the container body 10. [Figure 5] Figure 5 is a front cross-sectional view showing an enlarged view of the area around the opening 10a in Figure 3. [Figure 6] Figure 6 is a schematic plan view of the lid 50. [Figure 7] Figure 7 is a schematic cross-sectional view showing the inside of the heating tube 110. [Figure 8] Figure 8 is a schematic diagram showing an enlarged view of the area around the firing container 1 in Figure 7. [Figure 9] Figure 9 is a schematic diagram showing an enlarged view of the area around the front end 112 of the heating tube 110. [Modes for carrying out the invention]

[0008] Hereinafter, an embodiment of the technology disclosed herein will be described with reference to the drawings. Naturally, the embodiment described herein is not intended to particularly limit the present invention. Furthermore, components and parts that perform the same function will be appropriately denoted by the same reference numerals, and redundant descriptions will be omitted as appropriate. In the drawings, the reference numerals F, Rr, L, R, U, and D represent front, back, left, right, top, and bottom, respectively. However, these directions are defined solely for the convenience of explanation and do not limit the present invention unless otherwise specified.

[0009] Figure 1 is a schematic diagram of the firing furnace 100. Here, the firing furnace 100 is an example of a furnace in which a firing container 1 (see Figure 7) can be used. As shown in Figure 1, the firing furnace 100 comprises a heating tube 110, a furnace body 120, a drive mechanism 130, a material supply unit 140, a material recovery unit 145, and a heating device 150. The firing furnace 100 is a so-called rotary kiln that fires the material to be processed A while rotating the heating tube 110. Furthermore, the firing furnace 100 is a continuous firing furnace capable of continuously firing the material to be processed A. In Figure 1, the direction in which the material to be processed A is conveyed is indicated by a white arrow. In the configuration shown in Figure 1, the material to be processed A is conveyed from rear to front. The shape and type of the material to be processed A are not particularly limited. The material to be processed A may be in powder form.

[0010] The heating tube 110 is inserted into the furnace body 120. The heating tube 110 is cylindrical and extends in the front-rear direction. In the configuration shown in Figure 1, the rear end 111 and front end 112 of the heating tube 110 protrude from the furnace body 120. The rear end 111 and front end 112 of the heating tube 110 are open. The heating tube 110 is rotated by the drive mechanism 130 about a rotation axis W set along the direction in which the workpiece A is transported. The dimensions of the heating tube 110, such as the inner diameter, outer diameter, and length, can be appropriately changed according to the processing conditions of the workpiece A. The heating tube 110 may have flanges or the like, and may not be a perfect cylinder in all details. The heating tube 110 may be made of stainless steel material such as SUS310 or SUS316. However, heat-resistant cast steel may be used for the heating tube 110, or ceramic material may be used.

[0011] In Figure 1, the heating tube 110 is depicted as extending horizontally in the front-to-back direction, but in reality, a predetermined angle of gradient may be set. The heating tube 110 may be positioned so that the rear end 111 is higher than the front end 112. This allows the material to be processed A to be transported from rear to front in accordance with the rotation of the heating tube 110. From this perspective, the heating tube 110 may be installed with a gradient of, for example, an angle of 0.5 to 1 degree. With a gradient of 0.5 to 1 degree, the powdery material to be processed A is less likely to slide off, and the powdery material to be processed A is easily transported at an appropriate speed in accordance with the rotation of the heating tube 110. Therefore, by adjusting the rotation speed of the heating tube 110, the time that the material to be processed A remains inside the heating tube 110 can be adjusted. The angle of the gradient is not limited to the above, and an appropriate angle, for example, an angle of 0.3 to 5 degrees, may be selected.

[0012] The furnace body 120 surrounds the heating tube 110. In the configuration shown in Figure 1, the length of the furnace body 120 in the front-to-back direction is shorter than the length of the heating tube 110 in the longitudinal direction. A heating space 120a is formed between the furnace body 120 and the heating tube 110. Heating spaces 120a are formed above, below, and to the left and right of the heating tube 110. The furnace body 120 is made of a material that has heat resistance and heat insulation properties. The furnace body 120 may be made of, for example, refractory bricks, refractory blocks, castable refractories, ceramic fiberboards, etc.

[0013] Figure 2 is a cross-sectional view taken along line II-II of Figure 1. As shown in Figures 1 and 2, the furnace body 120 has a bottom wall 121, a pair of side walls 122, a top wall 123, a rear wall 124, and a front wall 125. The thickness of each wall of the furnace body 120 is set to a thickness sufficient to adequately insulate the heat inside the heating space 120a. Partitions 127 may be provided inside the furnace body 120 to divide the heating space 120a into multiple spaces along the front-to-back direction. Although not shown, the perimeter of the furnace body 120 may be covered with a metal (e.g., stainless steel) outer wall.

[0014] The bottom wall 121 and side walls 122 are approximately rectangular parallelepipeds in shape. As shown in Figure 2, the length of the bottom wall 121 in the left-right direction is greater than the outer diameter of the heating tube 110. A pair of side walls 122 extend upward from the left and right ends of the bottom wall 121. The upper ends of the side walls 122 reach approximately the center of the heating tube 110. A top wall 123 rests on the upper ends of the pair of side walls 122. The top wall 123 is semicircular (arch-shaped). Both left and right ends of the top wall 123 are supported by the pair of side walls 122. The shape of the top wall 123 is not particularly limited and may be formed horizontally (parallel to the bottom wall 121).

[0015] As shown in Figure 1, the rear wall 124 extends upward from the rear end of the bottom wall 121. The front wall 125 extends upward from the front end of the bottom wall 121. A through hole 124a is formed in the rear wall 124. A through hole 125a is formed in the front wall 125. The through holes 124a and 125a are substantially circular holes. The heating tube 110 is inserted through the through holes 124a and 125a.

[0016] The drive mechanism 130 rotates the heating tube 110. As shown in Figure 1, the drive mechanism 130 is disposed outside the furnace body 120. In this embodiment, the drive mechanism 130 rotates only the heating tube 110 among the furnace body 120 and the heating tube 110. The drive mechanism 130 rotates the heating tube 110 about the rotation axis W.

[0017] The drive mechanism 130 includes a sprocket 131, a pair of tires 132 and 133, and a pair of rollers 134 and 135. The sprocket 131 is disposed rearward of the furnace body 120. The sprocket 131 is attached along the outer peripheral surface of the heating tube 110. Although not shown in the drawings, a chain is wound around the sprocket 131. The chain is driven by a drive device (not shown). The driving force of the drive device is transmitted to the heating tube 110 via the chain and the sprocket 131.

[0018] The tire 132 is disposed rearward of the sprocket 131. The tire 133 is disposed forward of the furnace body 120. The pair of tires 132 and 133 are formed in an annular shape. The pair of tires 132 and 133 are attached along the outer peripheral surface of the heating tube 110. The tire 132 is rotatably supported by the roller 134. The tire 133 is rotatably supported by the roller 135. The heating tube 110 rotates on the rollers 134 and 135 via the tires 132 and 133.

[0019] The material supply unit 140 is connected to the rear end 111 of the heating tube 110. The material supply unit 140 supplies the object to be processed A into the interior of the heating tube 110. In the embodiment shown in FIG. 1, the material supply unit 140 includes a hopper 141 and a screw feeder 142. The hopper 141 stores the object to be processed A before treatment. The screw feeder 142 is connected to the hopper 141. The discharge port 142a of the screw feeder 142 is inserted into the interior of the heating tube 110. The screw feeder 142 supplies the object to be processed A stored in the hopper 141 into the interior of the heating tube 110. In the embodiment shown in FIG. 1, the rear end 111 of the heating tube 110 is covered by a duct 143 for dust collection. However, the rear end 111 of the heating tube 110 does not need to be covered by the duct 143.

[0020] The material recovery unit 145 is connected to the front end 112 of the heating tube 110. The material recovery unit 145 recovers the object to be processed A discharged from the interior of the heating tube 110. In the embodiment shown in FIG. 1, the material recovery unit 145 is a rectangular container that covers the front end 112 of the heating tube 110. An opening 145a is provided at the lower part of the material recovery unit 145. The object to be processed A discharged from the interior of the heating tube 110 to the material recovery unit 145 is appropriately discharged from the opening 145a of the material recovery unit 145 and recovered.

[0021] The heating devices 150 heat the heating space 120a. In the configuration shown in Figure 1, the firing furnace 100 is equipped with 16 heating devices 150. The heating devices 150 are arranged inside the heating space 120a. In the configuration shown in Figure 1, eight heating devices 150 are arranged below the heating tubes 110, and the remaining eight heating devices 150 are arranged above the heating tubes 110. The type of heating device 150 is not particularly limited and can be appropriately selected according to the heating conditions of the workpiece A. The heating device 150 may be, for example, a burner or an electric heater. When a burner is used as the heating device 150, the firing furnace 100 may be equipped with a fuel supply pipe for supplying fuel gas to the heating space 120a and an air supply pipe for supplying air to the heating space 120a. Furthermore, the arrangement of the heating devices 150 is not particularly limited. For example, the heating devices 150 may be arranged to the side of the heating tubes 110. The number and output of the heating devices 150 can be set appropriately according to the processing conditions of the material A to be processed. By changing the number and output of the heating devices 150, the material A to be processed can be processed under various processing conditions.

[0022] Incidentally, when firing the workpiece A using the firing furnace 100 described above, there are cases where it is desirable to fire the workpiece A in a firing container. For example, such cases include when the amount of workpiece A is small, or when it is desired to fire workpiece A experimentally. The inventors of the present invention aim to provide a firing container that can fire workpiece A more appropriately when firing workpiece A in a firing container.

[0023] Figure 3 is a schematic front cross-sectional view of the firing container 1. The firing container 1 contains the material to be processed A. The firing container 1 is used when firing the material to be processed A. The shape of the material to be processed A is not particularly limited. For example, the material to be processed A may be in powder form. The type of material to be processed A is not particularly limited. As shown in Figure 3, the firing container 1 comprises a container body 10, an inner plate 30, a gasket 40, and a lid 50. In Figure 3, the firing container 1 is shown in an upright position such that the lid 50 is located on top of the container body 10.

[0024] The container body 10 is formed in a stepped cylindrical shape. The object to be processed A is housed inside the container body 10. The container body 10 is made of a highly heat-resistant material. The container body 10 may be made of, for example, a metal material, a ceramic material, or graphite. Examples of metal materials include heat-resistant cast steel and stainless steel. Examples of ceramic materials include alumina and silicon carbide. The material of the container body 10 can be appropriately changed depending on the type of object to be processed A and the firing temperature.

[0025] The container body 10 has an opening 10a on one side. In the state shown in Figure 3, the opening 10a is located at the top of the container body 10. In this embodiment, the opening 10a is formed in a circular shape.

[0026] The container body 10 has a bottom wall 12 and side walls 14. The bottom wall 12 faces the opening 10a. In the state shown in Figure 3, the bottom wall 12 extends in the left-right and front-back directions. The bottom wall 12 is formed in a disc shape.

[0027] The side wall 14 extends from the bottom wall 12. In the configuration shown in Figure 3, the side wall 14 extends upward from the bottom wall 12. In this embodiment, the side wall 14 extends in a direction perpendicular to the bottom wall 12. The side wall 14 is formed in a stepped cylindrical shape. The side wall 14 has a small diameter portion 15 and a large diameter portion 16.

[0028] The small-diameter section 15 is connected to the bottom wall 12. The small-diameter section 15 extends upward from the bottom wall 12. The small-diameter section 15 extends in a direction perpendicular to the bottom wall 12. The large-diameter section 16 is connected to the upper part of the small-diameter section 15. The large-diameter section 16 extends upward. The large-diameter section 16 extends in a direction perpendicular to the bottom wall 12. The outer diameter D1 of the small-diameter section 15 is shorter than the outer diameter D2 of the large-diameter section 16. The length of the small-diameter section 15 is longer than the length of the large-diameter section 16. Here, "length of the small-diameter section 15" refers to the vertical length of the small-diameter section 15 in the state shown in Figure 3. "Length of the large-diameter section 16" refers to the vertical length of the large-diameter section 16 in the state shown in Figure 3.

[0029] The side wall 14 has an outer peripheral surface 14a. An outer peripheral step portion 18 is formed on the outer peripheral surface 14a of the side wall 14. In this embodiment, the outer peripheral step portion 18 is formed at the location where the small diameter portion 15 and the large diameter portion 16 are connected. In this embodiment, the outer peripheral step portion 18 is formed closer to the lid 50 than the bottom wall 12. In this embodiment, when the lid 50 is attached to the container body 10, the distance between the outer peripheral step portion 18 and the bottom wall 12 is longer than the distance between the outer peripheral step portion 18 and the lid 50.

[0030] Figure 4 is a front cross-sectional view showing an enlarged view of the area around the opening 10a of the container body 10. In Figure 4, the firing container 1 is shown with the middle plate 30, gasket 40, and lid 50 removed. The side wall 14 has an inner circumferential surface 14b. A female thread 20 is formed on the inner circumferential surface 14b of the side wall 14. The female thread 20 is formed in the large diameter portion 16. In the configuration shown in Figure 4, the female thread 20 is a round screw with an arc-shaped cross-section in the axial direction. In the state shown in Figure 4, the axial direction is the vertical direction. Also, although four threads of the female thread 20 are shown in Figure 4, the number of threads is not limited to this and can be appropriately changed according to the dimensions of the container body 10, etc.

[0031] An inner circumferential step portion 22 is formed on the inner circumferential surface 14b of the side wall 14. In this embodiment, the inner circumferential step portion 22 is formed at the location where the small diameter portion 15 and the large diameter portion 16 are connected. In the state shown in Figure 4, the inner circumferential step portion 22 is located below the female screw 20.

[0032] Figure 5 is a front cross-sectional view showing an enlarged view of the area around the opening 10a in Figure 3. Figure 5 shows the firing container 1 with the intermediate plate 30, gasket 40, and lid 50 attached. As shown in Figure 5, the intermediate plate 30 is placed on the inner circumferential step portion 22. In this embodiment, the intermediate plate 30 is a disc-shaped member having an opening 30a in the center. In this embodiment, the opening 30a is formed in a circular shape. Because the intermediate plate 30 has an opening 30a, it is easy for the worker to grasp the intermediate plate 30 and easy to remove the intermediate plate 30 from the container body 10. The intermediate plate 30 may be made of, for example, a metal material, a ceramic material, or graphite. Examples of metal materials include heat-resistant cast steel and stainless steel. Examples of ceramic materials include alumina and silicon carbide. The intermediate plate 30 may be made of the same material as the container body 10.

[0033] The gasket 40 is a component that seals the gap between the middle plate 30 and the side wall 14. As shown in Figure 5, when the lid 50 is attached to the container body 10, the gasket 40 is positioned between the middle plate 30 and the lid 50. The gasket 40 is a disc-shaped component with an opening 40a in its center. In the state shown in Figure 5, when the gasket 40 is viewed from above, a portion of the middle plate 30 overlaps with the gasket 40. In this embodiment, the opening 40a is formed in a circular shape. In this embodiment, the outer diameter of the middle plate 30 is larger than the diameter of the opening 40a of the gasket 40 and smaller than the outer diameter of the gasket 40. Because the gasket 40 has an opening 40a, it is easy for the worker to grasp the gasket 40 and easy to remove the gasket 40 from the container body 10. The gasket 40 may be made of a material that is heat-resistant and flexible. The gasket 40 may be made of, for example, ceramic fiber.

[0034] As shown in Figure 5, the lid 50 is attached to the container body 10 so as to close the opening 10a. The lid 50 is formed in a disc shape. As shown in Figure 4, the lid 50 has a top surface 50a and an outer peripheral surface 50b. The top surface 50a is a circularly formed surface that faces upward in the state shown in Figure 3. The outer peripheral surface 50b is a surface formed perpendicular to the top surface 50a. The lid 50 may be made of, for example, a metal material, a ceramic material, or graphite. Examples of metal materials include heat-resistant cast steel and stainless steel. Examples of ceramic materials include alumina and silicon carbide. The lid 50 may be made of the same material as the container body 10.

[0035] A male thread 52 that engages with the female thread 20 is formed on the outer circumferential surface 50b of the lid 50. In the configuration shown in Figure 4, the male thread 52, like the female thread 20, is a round thread with an arc-shaped cross-section in the axial direction. In Figure 4, four threads of the male thread 52 are shown, but the number of threads is not limited to this and can be appropriately changed according to the dimensions of the container body 10. The lid 50 is attached to the inner circumferential surface 14b of the side wall 14 by the engagement of the female thread 20 and the male thread 52. In this embodiment, as shown in Figure 5, when the lid 50 is attached to the container body 10, the lid 50 is embedded in the container body 10. In the configuration shown in Figure 5, the top surface 50a of the lid 50 is located below the upper end of the side wall 14.

[0036] Figure 6 is a schematic plan view of the lid 50. A groove 54 is formed in the top surface 50a. In the configuration shown in Figure 6, the groove 54 is formed to pass through the center of the top surface 50a. In the configuration shown in Figure 6, the groove 54 is formed in a straight line over the entire radial direction of the top surface 50a. However, the arrangement and shape of the groove 54 are not limited to the configuration shown in Figure 6. For example, the groove 54 may be formed over only a portion of the radial direction of the top surface 50a.

[0037] When firing the object to be processed A while it is contained in the firing container 1 as described above, the firing container 1 containing the object to be processed A is placed inside the heating tube 110. As a result, the object to be processed A contained in the firing container 1 is heated by the heating device 150.

[0038] Figure 7 is a schematic cross-sectional view showing the inside of the heating tube 110. Figure 7 shows the inside of the heating tube 110 with the firing container 1 placed inside the heating tube 110. Figure 8 is a schematic diagram showing a magnified view of the area around the firing container 1 in Figure 7. Although Figures 7 and 8 show three firing containers 1 placed side by side, the number of firing containers 1 placed inside the heating tube 110 is not particularly limited. The number of firing containers 1 placed inside the heating tube 110 may be one, two, or four or more.

[0039] As shown in Figure 8, the firing container 1 is placed inside the heating tube 110 with the container body 10 lying down so that the outer peripheral surface 14a is in contact with the inner wall 114 of the heating tube 110. In the configuration shown in Figure 8, the firing container 1 is placed so that the bottom wall 12 is located in front of the lid 50. Since an outer peripheral step portion 18 is formed on the outer peripheral surface 14a, the firing container 1 is placed in an inclined position. In the configuration shown in Figure 8, since the outer peripheral step portion 18 is formed closer to the lid 50 than the bottom wall 12, the small diameter portion 15 slopes downward as it moves forward, and the large diameter portion 16 also slopes downward as it moves forward. As shown in Figure 7, the firing container 1 is placed in the longitudinal center of the heating tube 110.

[0040] By the way, when the heating tube 110 is rotated while the firing container 1 is placed inside the heating tube 110 to fire the workpiece A, the firing container 1 may move in the longitudinal direction (front-to-back direction) of the heating tube 110. Depending on the type of workpiece A and the processing conditions, it may be desirable to fire the workpiece A without moving the firing container 1 in the longitudinal direction of the heating tube 110. Therefore, the inventors of the present invention would like to propose a firing furnace that can prevent the firing container from moving in the longitudinal direction of the heating tube during the firing of workpiece A.

[0041] As shown in Figure 7, the firing furnace 100 is equipped with a restricting member 160. The restricting member 160 is provided on the heating tube 110. The restricting member 160 restricts the movement of the firing container 1 in the longitudinal direction of the heating tube 110. In the configuration shown in Figure 7, the restricting member 160 is positioned in front of the firing container 1 placed inside the heating tube 110. In the configuration shown in Figure 7, the restricting member 160 includes a contact member 162 and a stopper 164. In the configuration shown in Figure 7, the contact member 162 and the stopper 164 are made of separate components. However, the contact member 162 and the stopper 164 may be a single integrated component.

[0042] Figure 9 is a schematic diagram showing an enlarged view of the area near the front end 112 of the heating tube 110. As shown in Figure 9, the contact member 162 is placed on the heating tube 110. The contact member 162 extends along the longitudinal direction of the heating tube 110. In this embodiment, the contact member 162 is formed in a cylindrical shape. However, the contact member 162 may be formed in a prismatic shape. The contact member 162 may be made of, for example, a metal material, a ceramic material, or graphite. The contact member 162 may be made of the same material as the heating tube 110. The contact member 162 is provided to contact the firing container 1 placed inside the heating tube 110. The contact member 162 contacts the bottom wall 12 of the firing container 1.

[0043] The stopper 164 is positioned in front of the heating tube 110. In this embodiment, the stopper 164 is fixed to the tire 133. The method of fixing the stopper 164 to the tire 133 is not particularly limited. The stopper 164 may be fixed to the tire 133 using, for example, screws. The stopper 164 may be configured to be detachable from the tire 133. In this embodiment, the stopper 164 is a cylindrical member that covers the front end 112 of the heating tube 110.

[0044] In this embodiment, the stopper 164 has a base portion 164a and a restricting portion 164b. The base portion 164a is a cylindrical member extending in the front-rear direction. The rear end of the base portion 164a is fixed to the tire 133. The front end of the base portion 164a is connected to the restricting portion 164b. In this embodiment, the restricting portion 164b is a disc-shaped member. The restricting portion 164b is in contact with the contact member 162. A portion of the restricting portion 164b overlaps with the contact member 162 when viewed from the front. The restricting portion 164b may be integrally formed with the base portion 164a, or it may be formed from a separate member.

[0045] According to the above embodiment, the firing container 1 comprises a container body 10 having an opening 10a on one side, and a lid 50 attached to the container body 10 so as to close the opening 10a. The container body 10 has a bottom wall 12 and a side wall 14. The bottom wall 12 faces the opening 10a. The side wall 14 is connected to the bottom wall 12 and extends from the bottom wall 12. The lid 50 is configured to be attached to the inner circumferential surface 14b of the side wall 14. As a result, when the firing container 1 is placed inside the heating tube 110, the lid 50 does not come into direct contact with the inner wall 114 of the heating tube 110. Even when the heating tube 110 is rotated to process the workpiece A contained in the firing container 1, the lid 50 is less likely to loosen and is less likely to come off the container body 10. Therefore, the workpiece A can be fired properly.

[0046] Furthermore, in this firing container 1, an outer peripheral step portion 18 is formed on the outer peripheral surface 14a of the side wall 14. Therefore, the firing container 1 is placed inside the heating tube 110 with the container body 10 tilted. As a result, when the heating tube 110 rotates, the container body 10 is more likely to move in one of the longitudinal directions of the heating tube 110, making it easier to predict the movement of the firing container 1 when firing the workpiece A. For this reason, using this firing container 1 when firing the workpiece A makes it easier to properly fire the workpiece A.

[0047] According to the above embodiment, the outer peripheral step portion 18 is formed closer to the lid 50 than to the bottom wall 12. As a result, the firing container 1 is placed inside the heating tube 110 so as to slope downward from the lid 50 towards the bottom wall 12. Therefore, the material to be processed A contained in the firing container 1 tends to accumulate towards the bottom wall 12 and is less likely to get stuck between the lid 50 and the side wall 14. Thus, it is possible to prevent the material to be processed A from sticking in the gap between the lid 50 and the side wall 14. The lid 50 is easy to open and close.

[0048] According to the above embodiment, when the lid 50 is attached to the container body 10, the lid 50 is embedded in the container body 10. As a result, when multiple firing containers 1 are placed side by side inside the heating tube 110, the lid 50 is less likely to come into contact with the container body 10 of another firing container 1. Therefore, even when the heating tube 110 is rotated to process the material A contained in the firing container 1, the lid 50 is less likely to loosen and less likely to come off the container body 10.

[0049] According to the above embodiment, a female thread 20 is formed on the inner circumferential surface 14b of the side wall 14. A male thread 52 that engages with the female thread 20 is formed on the outer circumferential surface 50b of the lid 50. As a result, when the heating tube 110 is rotated to process the workpiece A contained in the firing container 1, the lid 50 is less likely to loosen and the lid 50 is less likely to come off the container body 10.

[0050] According to the above embodiment, the female thread 20 and the male thread 52 are made of round threads whose threads form an arc-shaped cross-section in the axial direction. This makes it difficult for the workpiece A to enter the gap between the lid 50 and the side wall 14, thereby preventing the workpiece A from becoming stuck in the gap between the lid 50 and the side wall 14. Therefore, the lid 50 is easy to open and close. Furthermore, with this configuration, the pressure applied to the lid 50 and the container body 10 when the lid 50 is attached to the container body 10 is more easily distributed evenly.

[0051] According to the above embodiment, an inner circumferential step portion 22 is formed on the inner circumferential surface 14b of the side wall 14. The firing container 1 includes an intermediate plate 30 placed on the inner circumferential step portion 22 and a gasket 40 positioned between the intermediate plate 30 and the lid 50. The gasket 40 seals the gap between the intermediate plate 30 and the side wall 14. As a result, the workpiece A contained in the firing container 1 is less likely to get stuck between the lid 50 and the side wall 14. This prevents the workpiece A from becoming stuck in the gap between the lid 50 and the side wall 14. The lid 50 is easy to open and close.

[0052] By the way, when the lid 50 is attached to the container body 10, if the lid 50 is embedded in the container body 10, it becomes difficult for the worker to grasp the lid 50 and open and close the container body 10. However, according to the above embodiment, a groove 54 is formed on the top surface 50a of the lid 50. This allows, for example, the worker to insert a rod-shaped member into the groove 54 and rotate the lid 50. This makes it easier for the worker to open and close the container body 10.

[0053] According to the above-described embodiment, the firing furnace 100 is provided on the heating tube 110 and includes a restricting member 160 that restricts the movement of the firing container 1 in the longitudinal direction of the heating tube 110. This suppresses the movement of the firing container 1 in the longitudinal direction of the heating tube 110, allowing the workpiece A to be fired. Therefore, it is easier to properly fire the workpiece A.

[0054] In the above-described embodiment, the firing container 1 has an outer peripheral step portion 18 formed closer to the lid 50 than the bottom wall 12. Furthermore, the firing container 1 is placed inside the heating tube 110 such that the bottom wall 12 is positioned in front of the lid 50. Therefore, when the heating tube 110 rotates, the firing container 1 tends to move forward. Accordingly, as shown in Figure 7, it is preferable that the regulating member 160 be positioned in front of the firing container 1. However, the regulating member 160 may be positioned on both sides of the firing container 1 in the front-to-back direction. The firing container 1 may be placed so as to be sandwiched between two regulating members 160.

[0055] The above describes one embodiment of the proposed technology. However, the above-described embodiment is merely an example, and the technology can be implemented in other ways.

[0056] In the above-described embodiment, the container body 10 was formed in a stepped cylindrical shape. However, the container body 10 may be formed in a stepped rectangular tube shape. Alternatively, the container body 10 may have a cylindrical shape for the small diameter portion 15 and a rectangular tube shape for the large diameter portion 16. Conversely, the container body 10 may have a rectangular tube shape for the small diameter portion 15 and a cylindrical shape for the large diameter portion 16.

[0057] In the above-described embodiment, the intermediate plate 30 was a disc-shaped member having an opening 30a in the center. However, the intermediate plate 30 may be a disc-shaped member that does not have an opening in the center. Similarly, the gasket 40 may also be a disc-shaped member that does not have an opening in the center.

[0058] In the above-described embodiment, the female thread 20 and the male thread 52 were round threads with an arc-shaped cross-section in the axial direction. However, the female thread 20 and the male thread 52 may also be triangular threads with a triangular cross-section in the axial direction.

[0059] The configuration of the restricting member 160 is not limited to the embodiments described above. For example, in the embodiments described above, the contact member 162 was formed in a cylindrical shape. However, the contact member 162 may be a hollow member formed in a cylindrical shape. In this case, it is preferable that the inner diameter of the contact member 162 is smaller than the outer diameter D1 of the small diameter portion 15. Also, the restricting portion 164b of the stopper 164 may be a disc-shaped member having an opening in the center. In this case, the opening of the restricting portion 164b may be formed in a circular shape. It is preferable that the diameter of the opening of the restricting portion 164b is smaller than the outer diameter of the contact member 162.

[0060] In the above embodiment, the material supply unit 140 had a hopper 141 and a screw feeder 142. However, the material supply unit 140 is not limited to the configuration of the above embodiment. The material supply unit 140 may have, for example, a chute or a vibrating feeder instead of the screw feeder 142.

[0061] The technologies disclosed herein have been described in detail above. Unless otherwise specified, the embodiments and other details mentioned herein do not limit the present invention. Furthermore, the technologies disclosed herein can be modified in various ways, and each component and each process mentioned herein may be omitted or combined as appropriate, unless no particular problems arise. This specification also includes the disclosures described in the following sections.

[0062] Section 1: A container body having an opening on one side, A lid is attached to the container body so as to close the aforementioned opening. Equipped with, The container body is The bottom wall opposite the aforementioned opening, The side wall is connected to the bottom wall and extends from the bottom wall. It has, The lid is configured to be attached to the inner circumferential surface of the side wall, An outer peripheral step is formed on the outer peripheral surface of the aforementioned side wall. Container for firing.

[0063] Section 2: The firing container according to item 1, wherein the outer peripheral step is formed closer to the lid than the bottom wall.

[0064] Section 3: The firing container according to item 1 or 2, wherein the lid is attached to the container body and the lid is embedded in the container body.

[0065] Section 4: A female thread is formed on the inner circumferential surface of the side wall. A firing container according to any one of claims 1 to 3, wherein a male thread that engages with the female thread is formed on the outer surface of the lid.

[0066] Section 5: The firing container according to item 4, wherein the female thread and the male thread are round threads whose threads form an arc-shaped cross-section in the axial direction.

[0067] Item 6: An inner circumferential step is formed on the inner circumferential surface of the side wall. The intermediate plate placed on the aforementioned inner circumferential step portion, A gasket is placed between the intermediate plate and the lid to seal the gap between the intermediate plate and the side wall. A firing container according to any one of items 1 to 5, comprising the features described above.

[0068] Section 7: A firing container according to any one of items 1 to 6, wherein a groove is formed on the top surface of the lid.

[0069] Section 8: A firing furnace for firing an object to be processed contained in a firing container described in any one of items 1 to 7, The heating tube in which the aforementioned firing container is placed, A furnace body covering the heating tube, A drive mechanism for rotating the heating tube, A heating device for heating the object to be processed contained in the aforementioned firing container, A restricting member is provided on the heating tube to restrict the movement of the firing container in the longitudinal direction of the heating tube. A firing furnace equipped with the necessary components. [Explanation of Symbols]

[0070] 1. Container for firing 10 Container body 10a opening 12 Bottom wall 14 Side wall 14a Outer surface of the side wall 14b Inner surface of the side wall 18 Outer perimeter stepped section 20 Female thread 22 Inner circumferential step portion 30 medium plate 40 Gasket 50 lids 50a Top surface of the lid 50b Outer surface of the lid 52 Male screw 54 Groove 100 firing furnaces 110 Heating tube 120 Furnace body 130 Drive mechanism 150 Heating device 160 Regulating member A. Workpiece to be processed

Claims

1. A firing container used when firing an object to be processed, comprising a firing furnace having a heating tube, a furnace body covering the periphery of the heating tube and forming a heating space between itself and the heating tube, a drive mechanism for rotating the heating tube, and a heating device for heating the heating space, A container body having an opening on one side, A lid is attached to the container body so as to close the aforementioned opening. Equipped with, The container body is The bottom wall opposite the aforementioned opening, The side wall is connected to the bottom wall and extends from the bottom wall. It has, The lid is configured to be attached to the inner circumferential surface of the side wall, The side wall is a stepped cylindrical shape, with the opening side being larger than the bottom wall. A stepped outer periphery portion is formed on the side wall at a position closer to the opening than the bottom wall, which protrudes outward. A firing container in which the lid is attached to the container body and the lid is embedded in the container body such that the top surface of the lid is located inside the container body.

2. An inner circumferential step is formed on the inner circumferential surface of the side wall, The intermediate plate placed on the aforementioned inner circumferential step portion, A gasket is placed between the intermediate plate and the lid to seal the gap between the intermediate plate and the side wall. Equipped with, The firing container according to claim 1, wherein the intermediate plate and the gasket are each disc-shaped with an opening in the center.

3. A firing container used when firing an object to be processed in a firing furnace comprising a heating tube, a furnace body covering the periphery of the heating tube and forming a heating space between itself and the heating tube, a drive mechanism for rotating the heating tube, and a heating device for heating the heating space, A container body having an opening on one side, A lid is attached to the container body so as to close the aforementioned opening, The middle plate and, Gasket and, Equipped with, The container body is The bottom wall opposite the aforementioned opening, The side wall is connected to the bottom wall and extends from the bottom wall. It has, The lid is configured to be attached to the inner circumferential surface of the side wall, The side wall is a stepped cylindrical shape, with the opening side being larger than the bottom wall, and an outer peripheral stepped portion is formed on the side wall at a position closer to the opening than the bottom wall, An inner circumferential step is formed on the inner circumferential surface of the side wall. The aforementioned intermediate plate is placed on the inner circumferential step portion. The gasket is positioned between the middle plate and the lid, and seals the gap between the middle plate and the side wall. A firing container wherein the intermediate plate and the gasket are each disc-shaped with an opening in the center.

4. A female thread is formed on the inner circumferential surface of the side wall. The firing container according to claim 1 or 3, wherein a male thread that engages with the female thread is formed on the outer circumferential surface of the lid.

5. The firing container according to claim 4, wherein the female thread and the male thread are round threads whose threads form an arc-shaped cross-section in the axial direction.

6. The firing container according to claim 4, wherein a groove is formed on the top surface of the lid.

7. The firing container according to claim 6, wherein the groove is a straight groove passing through the center of the top surface of the lid.

8. A firing furnace for firing an object to be processed contained in a firing container according to claim 1 or 3, A heating tube having an inner wall, in which the firing container is placed inside in a state where the container body is lying down so that the side walls of the firing container are in contact with the inner wall, A furnace body covering the heating tube, A drive mechanism for rotating the heating tube, A heating device for heating the object to be processed contained in the aforementioned firing container, A restricting member is provided only on the bottom wall side of the firing container, which is placed inside the heating tube with respect to the longitudinal direction of the heating tube, and which restricts the movement of the firing container in the longitudinal direction of the heating tube. A firing furnace equipped with the necessary components.

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