Rotary kiln

Abstract

To measure the temperature inside the heating tube. [Solution] The rotary kiln 1 comprises a heating tube 10, a drive mechanism 30, a pipe 70, and a thermocouple 80. The heating tube 10 has a transport space 10a formed inside through which the workpiece A is transported. The drive mechanism 30 rotates the heating tube 10. The pipe 70 is inserted into the heating tube 10 along its longitudinal direction. The thermocouple 80 is provided in the pipe 70. The temperature sensing part of the thermocouple 80 is located inside the heating tube 10.

Description

Technical Field

[0001] The present invention relates to a rotary kiln.

Background Art

[0002] Japanese Utility Model Publication No. 52-115603 discloses a rotary kiln internal temperature measuring device characterized by providing a thermometer support pipe extending in the furnace interior direction on the furnace wall and providing a plurality of thermocouples on this thermometer support pipe. According to Japanese Utility Model Publication No. 52-115603, it is said that the temperature distribution reaching not only near the furnace wall but also the center part of the furnace interior can be measured by a plurality of thermocouples attached in the longitudinal direction of the thermometer support pipe.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The inventor of the present invention desires to measure the temperature inside the heating pipe.

Means for Solving the Problems

[0005] The rotary kiln disclosed herein includes a heating pipe having a conveyance space inside which an object to be processed is conveyed, a furnace body that covers the periphery of the heating pipe and forms a heating space between the heating pipe, a drive mechanism that rotates the heating pipe, a pipe inserted into the heating pipe along the longitudinal direction of the heating pipe, and a thermocouple provided on the pipe. The temperature measuring part of the thermocouple is arranged inside the heating pipe. According to this rotary kiln, the temperature inside the heating pipe can be measured.

Brief Description of the Drawings

[0006] [Figure 1]Figure 1 is a schematic diagram of a rotary kiln. [Figure 2] Figure 2 is a cross-sectional view taken along line II-II in Figure 1. [Figure 3] Figure 3 is a schematic diagram showing an enlarged view of the area around the heating tube in a rotary kiln according to one embodiment. [Figure 4] Figure 4 is a cross-sectional view taken along line IV-IV of Figure 3. [Figure 5] Figure 5 is a schematic cross-sectional view showing the inside of the pipe. [Figure 6] Figure 6 is a schematic diagram showing an enlarged view of the area around the heating tube in a rotary kiln according to another embodiment. [Modes for carrying out the invention]

[0007] 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. These directions are defined solely for the convenience of explanation and do not limit the present invention unless otherwise specified.

[0008] Figure 1 is a schematic diagram of rotary kiln 1. 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. In rotary kiln 1, powdered material to be processed A is processed. As shown in Figure 1, rotary kiln 1 comprises a heating tube 10, a furnace body 20, a drive mechanism 30, a material supply unit 40, a material recovery unit 45, and a heating device 50.

[0009] The heating tube 10 is inserted into the furnace body 20. The heating tube 10 is cylindrical and extends in the front-to-back direction. In the configuration shown in Figure 1, the rear end 11 and front end 12 of the heating tube 10 protrude from the furnace body 20. Inside the heating tube 10, a transport space 10a is formed through which the workpiece A is transported. The heating tube 10 is rotated by a drive mechanism 30 around a rotation axis W set along the direction in which the workpiece A is transported. The dimensions of the heating tube 10, 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 10 may have flanges or the like, and may not be a perfect cylinder in all its details. Although not shown in the illustration, the heating tube 10 may be provided with a gas supply pipe for supplying atmospheric gas when heating the workpiece A.

[0010] The heating tube 10 is required to have the necessary corrosion resistance depending on the type of workpiece A and the atmospheric gas used when heating workpiece A. In this embodiment, stainless steel material such as SUS310 or SUS316 is used for the heating tube 10. However, heat-resistant cast steel may be used for the heating tube 10, or ceramic material may be used.

[0011] A supply port 11a is formed at the rear end 11 of the heating tube 10. The material to be processed A is supplied into the heating tube 10 through the supply port 11a. A discharge port 12a is formed at the front end 12 of the heating tube 10. The material to be processed A, which has been processed inside the heating tube 10, is discharged from inside the heating tube 10 through the discharge port 12a. The supply port 11a and the discharge port 12a are located outside the furnace body 20.

[0012] In Figure 1, the heating tube 10 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 10 may be positioned so that the rear end 11 is higher than the front end 12. This allows the material to be processed A to be transported from rear to front in accordance with the rotation of the heating tube 10. From this perspective, the heating tube 10 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 10. Therefore, by adjusting the rotation speed of the heating tube 10, the time that the material to be processed A remains inside the heating tube 10 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.

[0013] The furnace body 20 surrounds the heating tube 10. In the configuration shown in Figure 1, the length of the furnace body 20 in the front-to-back direction is shorter than the length of the heating tube 10 in the longitudinal direction. A heating space 20a is formed between the furnace body 20 and the heating tube 10. That is, heating spaces 20a are formed above, below, and to the left and right of the heating tube 10. The furnace body 20 is made of a material that has heat resistance and heat insulation properties. The furnace body 20 may be made of materials such as refractory bricks, refractory blocks, castable refractories, or ceramic fiberboards.

[0014] 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 20 has a bottom wall 21, a pair of side walls 22, a top wall 23, a rear wall 24, and a front wall 25. The thickness of each wall of the furnace body 20 is set to a thickness sufficient to adequately insulate the heat inside the heating space 20a. Partitions 27 may be provided inside the furnace body 20 to divide the heating space 20a into multiple spaces along the front-to-back direction. Although not shown, the perimeter of the furnace body 20 may be covered with a metal (e.g., stainless steel) outer wall.

[0015] The bottom wall 21 and side walls 22 are approximately rectangular parallelepipeds in shape. As shown in Figure 2, the length of the bottom wall 21 in the left-right direction is greater than the outer diameter of the heating tube 10. A pair of side walls 22 extend upward from the left and right ends of the bottom wall 21. The upper ends of the side walls 22 reach approximately the center of the heating tube 10. A top wall 23 rests on the upper ends of the pair of side walls 22. The top wall 23 is semicircular (arch-shaped). Both left and right ends of the top wall 23 are supported by the pair of side walls 22. The shape of the top wall 23 is not particularly limited and may be formed horizontally (parallel to the bottom wall 21).

[0016] As shown in Figure 1, the rear wall 24 extends upward from the rear end of the bottom wall 21. The front wall 25 extends upward from the front end of the bottom wall 21. A through hole 24a is formed in the rear wall 24. A through hole 25a is formed in the front wall 25. The through holes 24a and 25a are approximately circular in shape. The heating tube 10 is inserted through the through holes 24a and 25a.

[0017] The drive mechanism 30 rotates the heating tube 10. As shown in Figure 1, the drive mechanism 30 is located outside the furnace body 20. In this embodiment, the drive mechanism 30 rotates only the heating tube 10 of the furnace body 20 and the heating tube 10. The drive mechanism 30 rotates the heating tube 10 about the axis of rotation W.

[0018] The drive mechanism 30 comprises a sprocket 31, a pair of tires 32 and 33, and a pair of rollers 34 and 35. The sprocket 31 is positioned behind the furnace body 20. The sprocket 31 is mounted along the outer surface of the heating tube 10. Although not shown, a chain is wound around the sprocket 31. The chain is driven by a drive device (not shown). The driving force of the drive device is transmitted to the heating tube 10 via the chain and the sprocket 31.

[0019] The tire 32 is disposed behind the sprocket 31. The tire 33 is disposed in front of the furnace body 20. The pair of tires 32 and 33 are formed in an annular shape. The pair of tires 32 and 33 are attached along the outer peripheral surface of the heating pipe 10. The tire 32 is rotatably supported by the roller 34. The tire 33 is rotatably supported by the roller 35. The heating pipe 10 rotates on the rollers 34 and 35 via the tires 32 and 33.

[0020] The material supply unit 40 is connected to the rear end 11 of the heating pipe 10. The material supply unit 40 supplies the workpiece A into the conveyance space 10a formed inside the heating pipe 10. In the form shown in FIG. 1, the material supply unit 40 includes a hopper 41 and a screw feeder 42. The hopper 41 contains the workpiece A before processing. The screw feeder 42 is connected to the hopper 41. The discharge port 42a of the screw feeder 42 is inserted inside the heating pipe 10. The screw feeder 42 supplies the workpiece A contained in the hopper 41 to the conveyance space 10a. In the form shown in FIG. 1, the rear end 11 of the heating pipe 10 is covered by a duct 43 for dust collection. However, the rear end 11 of the heating pipe 10 may not be covered by the duct 43.

[0021] The material recovery unit 45 is connected to the front end 12 of the heating pipe 10. In the material recovery unit 45, the workpiece A discharged from the discharge port 12a is recovered. In the form shown in FIG. 1, the material recovery unit 45 is a square container that covers the discharge port 12a. An opening 45a is provided at the lower part of the material recovery unit 45. The workpiece A discharged from inside the heating pipe 10 into the material recovery unit 45 is appropriately discharged from the opening 45a of the material recovery unit 45 and recovered.

[0022] The heating device 50 is a device that heats the heating space 20a. The heating device 50 is located inside the heating space 20a. In the configuration shown in Figure 1, the heating device 50 is located below the heating tube 10. In the configuration shown in Figure 1, the rotary kiln 1 is equipped with two heating devices 50. The type of heating device 50 is not particularly limited and can be appropriately selected according to the heating conditions of the workpiece A. The heating device 50 may be, for example, a burner or an electric heater. When a burner is used as the heating device 50, the rotary kiln 1 may be equipped with a fuel supply pipe for supplying fuel gas to the heating space 20a and an air supply pipe for supplying air to the heating space 20a. Furthermore, the arrangement of the heating device 50 is not particularly limited. For example, the heating device 50 may be located above the heating tube 10 or to the side of the heating tube 10. The number and output of the heating devices 50 can be appropriately set according to the processing conditions of the workpiece A. By changing the number and output of the heating devices 50, the object A to be processed can be heat-treated under various processing conditions.

[0023] Although not shown in the diagram, the furnace body 20 may be equipped with a temperature sensor for measuring the temperature of the heating space 20a. For example, a thermocouple can be used as this temperature sensor. This allows the heating device 50 to be controlled according to the temperature of the heating space 20a, thereby heating the heating space 20a to a desired temperature.

[0024] By the way, in order to check the heating status of the workpiece A being heat-treated in the rotary kiln 1, it is preferable to measure the temperature inside the heating tube 10 through which the workpiece A passes during heat treatment, rather than measuring the temperature of the heating space 20a. The inventors want to measure the internal temperature of the heating tube 10 during heat treatment. However, the inside of the heating tube 10 is at a high temperature during heat treatment. The heating tube 10 rotates during heat treatment. Furthermore, the internal temperature of the heating tube 10 during heat treatment can vary in the longitudinal direction of the heating tube 10. For such a rotary kiln 1, it is difficult to say that a configuration for measuring the internal temperature of the heating tube 10 during heat treatment has been established.

[0025] Figure 3 is a schematic diagram showing a magnified view of the area around the heating tube 10 in the rotary kiln 1. As shown in Figure 3, the rotary kiln 1 is equipped with a pipe 70 and a thermocouple 80.

[0026] The pipe 70 is inserted into the heating tube 10 along its longitudinal direction. In the configuration shown in Figure 3, the pipe 70 extends in the front-to-back direction. The pipe 70 is formed in a cylindrical shape. However, the pipe 70 may also be formed in a rectangular tube shape or the like. One end of the pipe 70 is open, and the other end of the pipe 70 is closed. In the configuration shown in Figure 3, the front end of the pipe 70 is open, and the rear end of the pipe 70 is closed. The pipe 70 has an opening 71. The opening 71 is formed at the front end of the pipe 70. The outer diameter of the pipe 70 is not particularly limited, but may be, for example, about one-tenth of the inner diameter of the heating tube 10. The inner diameter of the pipe 70 is not particularly limited as long as it is large enough to insert the thermocouple 80.

[0027] The front end of the pipe 70 is positioned between the furnace body 20 and the material recovery section 45 in the front-rear direction. The front end of the pipe 70 is positioned in front of the tire 33. The rear end of the pipe 70 is positioned between the furnace body 20 and the duct 43 in the front-rear direction. One end of the pipe 70 protrudes from the heating tube 10. In the configuration shown in Figure 3, the front end of the pipe 70 protrudes from the heating tube 10. In the configuration shown in Figure 3, the pipe 70 is bent near its front end. The pipe 70 is provided so as to penetrate the inner wall 14 of the heating tube 10. The rear end of the pipe 70 is located inside the heating tube 10.

[0028] The pipe 70 is attached to the inner wall 14 of the heating tube 10. In the configuration shown in Figure 3, the pipe 70 is attached to the heating tube 10 by mounting members 75. In the configuration shown in Figure 3, seven mounting members 75 are arranged at predetermined intervals along the front-to-back direction. However, the number and arrangement of the mounting members 75 can be appropriately changed depending on the length of the pipe 70 and the length of the heating tube 10. Furthermore, in the configuration shown in Figure 3, at the portion 15 where the pipe 70 penetrates the inner wall 14 of the heating tube 10, the entire circumference of the outer surface of the pipe 70 is welded to the inner wall 14 of the heating tube 10. This closes the gap between the pipe 70 and the heating tube 10, preventing the material to be processed A from leaking to the outside of the heating tube 10.

[0029] Figure 4 is a cross-sectional view taken along line IV-IV of Figure 3. In Figure 4, the drive mechanism 30 is not shown. The mounting member 75 has a base portion 76 and a housing portion 77. The base portion 76 is provided in a pair, left and right. In the configuration shown in Figure 4, the base portion 76 extends along the inner wall 14 of the heating tube 10. The base portion 76 is joined to the inner wall 14 of the heating tube 10 by welding. The housing portion 77 is positioned radially inward of the heating tube 10 than the base portion 76. The housing portion 77 is formed in a semicircular shape. The heating tube 10 is inserted into the housing portion 77. Note that the mounting member 75 only needs to be configured so that the pipe 70 can be attached to the inner wall 14 of the heating tube 10, and the shape of the mounting member 75 is not limited to the configuration shown in Figure 4.

[0030] In this embodiment, the pipe 70 is made of the same material as the heating tube 10. The mounting member 75 is made of the same material as the heating tube 10. That is, the heating tube 10, the pipe 70, and the mounting member 75 are made of the same material. In this embodiment, since the heating tube 10 is made of stainless steel, the pipe 70 and the mounting member 75 are also made of stainless steel. For example, SUS310 or SUS316 may be used for the pipe 70 and the mounting member 75.

[0031] Figure 5 is a schematic cross-sectional view showing the inside of the pipe 70. In Figure 5, the furnace body 20, drive mechanism 30, and heating device 50 are not shown. The thermocouple 80 measures the temperature inside the heating tube 10. Although not shown in detail, the thermocouple 80 has a first wire and a second wire. The first and second wires are made of different materials. The temperature sensing part 81 of the thermocouple 80 is formed by joining one end of the first wire and one end of the second wire. The type of thermocouple 80 is not particularly limited. For example, a K-type thermocouple can be used as the thermocouple 80. The type of thermocouple 80 can be changed as appropriate depending on the processing conditions of the workpiece A.

[0032] The thermocouple 80 is installed in the pipe 70. As shown in Figure 3, the thermocouple 80 is inserted into the pipe 70 through the opening 71. As shown in Figure 5, the temperature sensing part 81 of the thermocouple 80 is located inside the heating tube 10 and inside the pipe 70. In the configuration shown in Figure 5, four thermocouples 80 are installed in the pipe 70. In the configuration shown in Figure 5, the four temperature sensing parts 81 are arranged along the longitudinal direction of the pipe 70. The four temperature sensing parts 81 are arranged at predetermined intervals. The number of thermocouples 80 is not particularly limited. The rotary kiln 1 may have one, two, or three thermocouples 80, or it may have five or more. The number of thermocouples 80 can be appropriately changed depending on the length of the heating tube 10, etc. The arrangement of the temperature sensing parts 81 is not particularly limited. The temperature sensing parts 81 may be arranged to suit the desired temperature measurement position. For example, if it is desired to measure the temperature of the central part of the heating tube 10 in the longitudinal direction, it is preferable that at least one temperature measuring unit 81 be positioned in the central part of the heating tube 10 in the longitudinal direction.

[0033] As shown in Figure 3, a data logger 85 is attached to the front end of the pipe 70. The data logger 85 is located outside the heating tube 10. In this embodiment, the data logger 85 is attached to the pipe 70 by attaching a housing box 87 to the front end of the pipe 70 and housing the data logger 85 in the housing box 87. The data logger 85 is electrically connected to the thermocouple 80. The data logger 85 stores temperature measurements taken by the thermocouple 80. Although not shown in the figure, the data logger 85 is equipped with a writable storage device such as a non-volatile memory.

[0034] As shown in Figure 3, the rotary kiln 1 of this embodiment includes a pipe 70 and a thermocouple 80. The pipe 70 is inserted into the heating tube 10 along its longitudinal direction. The thermocouple 80 is provided on the pipe 70. The temperature sensing part 81 of the thermocouple 80 is located inside the heating tube 10. This allows the temperature inside the heating tube 10 to be measured.

[0035] In this embodiment, the pipe 70 is attached to the inner wall 14 of the heating tube 10. Therefore, when the drive mechanism 30 rotates the heating tube 10 around the rotation axis W, the pipe 70 also rotates around the rotation axis W along with the heating tube 10. This makes it easier for the outer surface of the pipe 70 to be heated evenly, thus suppressing deformation of the pipe 70 due to heat. Also, because the pipe 70 rotates around the rotation axis W, the pipe 70 comes into contact with the workpiece A with each rotation cycle of the heating tube 10. Therefore, it is possible to measure the temperature of the workpiece A while the heat treatment is being performed inside the heating tube 10. Furthermore, because the pipe 70 comes into contact with the workpiece A with each rotation cycle of the heating tube 10, the heat treatment of the workpiece A can be performed while stirring the workpiece A with the pipe 70.

[0036] In this embodiment, the pipe 70 is made of the same material as the heating tube 10. Therefore, when the heating tube 10 and the pipe 70 are heated by the heating device 50, there is little difference between the amount of thermal expansion of the heating tube 10 and the amount of thermal expansion of the pipe 70. As a result, even when the heating tube 10 and the pipe 70 are heated, less load is placed on the heating tube 10 and the pipe 70. Similarly, in this embodiment, the mounting member 75 is also made of the same material as the heating tube 10 and the pipe 70, so less load is placed on the mounting member 75, and even less load is placed on the heating tube 10 and the pipe 70.

[0037] As shown in Figure 5, according to this embodiment, the thermocouple 80 is inserted inside the pipe 70. This prevents the thermocouple 80 from directly contacting the workpiece A, thereby suppressing wear of the thermocouple 80.

[0038] According to this embodiment, the rotary kiln 1 is equipped with four thermocouples 80. Four temperature sensing units 81 are arranged along the longitudinal direction of the pipe 70. Therefore, the temperature distribution in the longitudinal direction inside the heating tube 10 can be measured. Since the workpiece A is transported along the longitudinal direction of the heating tube 10, the temperature history of the workpiece A during heat treatment can be estimated based on the temperature distribution in the longitudinal direction inside the heating tube 10. The heat treatment status of the workpiece A can be grasped more accurately.

[0039] As shown in Figure 3, according to this embodiment, the front end of the pipe 70 protrudes from the heating tube 10. A data logger 85, electrically connected to a thermocouple 80, is attached to the front end of the pipe 70. This allows the temperature measurements taken inside the heating tube 10 by the thermocouple 80 to be stored in the data logger 85. Furthermore, since the data logger 85 is located outside the heating tube 10, failure of the data logger 85 due to heat can be prevented.

[0040] 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.

[0041] Figure 6 is a schematic diagram showing an enlarged view of the area around the heating tube 10 in a rotary kiln 1 according to another embodiment. In the configuration shown in Figure 6, a transmitter 90 is attached to the front end of the pipe 70 instead of the data logger 85. The transmitter 90 is configured to communicate wirelessly with an external device 100 located outside the rotary kiln 1. The transmitter 90 transmits the temperature measurement data from the thermocouple 80 to the external device 100 via wireless communication. Various conventionally known wireless transmitters can be used as the transmitter 90. Although not shown in the diagram, the external device 100 includes a communication interface for receiving data transmitted from the transmitter 90 and a writable storage device such as non-volatile memory. The external device 100 may be, for example, a laptop computer, a tablet terminal, or a server device. In this way, by transmitting the temperature measurement data from the thermocouple 80 to the external device 100, the temperature measurement data from the thermocouple 80 can be stored on the external device 100, or the temperature measurement data from the thermocouple 80 can be remotely checked.

[0042] In the above embodiment, the opening 71 was formed at the front end of the pipe 70. However, the opening 71 may also be formed at the rear end of the pipe 70. In this case, the rear end of the pipe 70 may be provided to protrude from the heating tube 10. In this case, the data logger 85 may be attached to the rear end of the pipe 70.

[0043] The sprocket 31 may be positioned in front of the furnace body 20. The drive mechanism 30 may include a tire 32 and a roller 34, but may not include a tire 33 and a roller 35. The drive mechanism 30 may include a tire 33 and a roller 35, but may not include a tire 32 and a roller 34.

[0044] In the configuration shown in Figure 3, the rotary kiln 1 was configured such that the pipe 70 was attached to the inner wall 14 of the heating tube 10, and the pipe 70 rotated in conjunction with the rotation of the heating tube 10. However, the pipe 70 does not have to be attached to the inner wall 14 of the heating tube 10. For example, the pipe 70 may be fixed to the furnace body 20. In this case, even if the heating tube 10 rotates, the pipe 70 will not rotate.

[0045] In the configuration shown in Figure 3, the front end of the pipe 70 protruded from the heating tube 10. However, both the front and rear ends of the pipe 70 may protrude from the heating tube 10. At least one end of the pipe 70 on which the data logger 85 is attached protrudes from the heating tube 10.

[0046] In the configuration shown in Figure 5, the temperature sensing unit 81 was located inside the pipe 70. However, the temperature sensing unit 81 may also be located outside the pipe 70. In this case, as the pipe 70 rotates, the thermocouple 80 comes into direct contact with the workpiece A. Therefore, compared to the case where the temperature sensing unit 81 is located inside the pipe 70, the thermocouple 80 is more prone to wear, but the temperature of the workpiece A can be measured more accurately.

[0047] In the above embodiment, the heating tube 10 and the pipe 70 were made of the same material. However, the pipe 70 may be made of a different material than the heating tube 10. The pipe 70 may be made of heat-resistant cast steel or ceramic material, for example. Similarly, the mounting member 75 may be made of a different material than the heating tube 10. The mounting member 75 may be made of heat-resistant cast steel or ceramic material, for example. Furthermore, the pipe 70 and the mounting member 75 may be made of different materials from each other.

[0048] 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.

[0049] Section 1: A heating tube with a transport space formed inside in which the object to be processed is transported, A furnace body that covers the periphery of the heating tube and forms a heating space between itself and the heating tube, A drive mechanism for rotating the heating tube, Along the longitudinal direction of the heating tube, a pipe inserted into the heating tube, A thermocouple provided in the aforementioned pipe and Equipped with, A rotary kiln in which the temperature-sensing part of the thermocouple is located inside the heating tube.

[0050] Section 2: The rotary kiln according to item 1, wherein the pipe is attached to the inner wall of the heating tube.

[0051] Section 3: The rotary kiln according to item 2, wherein the pipe is made of the same material as the heating tube.

[0052] Section 4: The rotary kiln according to any one of claims 1 to 3, wherein the thermocouple is inserted into the pipe.

[0053] Section 5: The thermocouples are provided in multiple locations. A rotary kiln according to any one of claims 1 to 4, wherein a plurality of the temperature sensing units are arranged along the longitudinal direction of the pipe.

[0054] Item 6: One end of the aforementioned pipe protrudes from the heating tube, A rotary kiln according to any one of claims 1 to 5, wherein a data logger electrically connected to the thermocouple is attached to one end of the pipe.

[0055] Section 7: One end of the aforementioned pipe protrudes from the heating tube, A rotary kiln according to any one of claims 1 to 5, wherein a transmitter for transmitting temperature measurements from the thermocouple to an external device via wireless communication is attached to one end of the pipe. [Explanation of symbols]

[0056] 1. Rotary Kiln 10 heating tube 10a Conveying space 14 Inner wall 20 Furnace body 20a heating space 30 Drive mechanism 70 pipes 80 Thermocouples 81 Temperature sensing section 85 Data Logger 90 Transmitter 100 External equipment A. Workpiece to be processed

Claims

1. A heating tube with a transport space formed inside in which the object to be processed is transported, A furnace body that covers the periphery of the heating tube and forms a heating space between itself and the heating tube, A drive mechanism for rotating the heating tube, Along the longitudinal direction of the heating tube, a pipe inserted into the heating tube, A thermocouple provided in the aforementioned pipe and Equipped with, A rotary kiln in which the temperature-sensing part of the thermocouple is located inside the heating tube.

2. The rotary kiln according to claim 1, wherein the pipe is attached to the inner wall of the heating tube.

3. The rotary kiln according to claim 2, wherein the pipe is made of the same material as the heating tube.

4. The rotary kiln according to claim 1, wherein the thermocouple is inserted into the pipe.

5. The thermocouples are provided in multiple locations. The rotary kiln according to claim 1, wherein a plurality of the temperature measuring units are arranged along the longitudinal direction of the pipe.

6. One end of the aforementioned pipe protrudes from the heating tube, The rotary kiln according to claim 1, wherein a data logger electrically connected to the thermocouple is attached to one end of the pipe.

7. One end of the aforementioned pipe protrudes from the heating tube, The rotary kiln according to claim 1, wherein a transmitter for transmitting temperature measurements from the thermocouple to an external device via wireless communication is attached to one end of the pipe.

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