A device for measuring the internal temperature of material in relative kiln movement

Abstract

The application discloses a device for measuring the internal temperature of materials in relative kiln movement, comprising a detector and a probe head, the detector is fixed relative to the position of the moving saggar in the kiln; the detector comprises a temperature measuring element, a heat preservation layer and a thermal insulation layer arranged in sequence from inside to outside; the temperature measuring element is used for temperature detection, the heat preservation layer is used for keeping the temperature measuring element in a preset working temperature range during sintering, and the thermal insulation layer is detachably connected to the outside of the heat preservation layer and is used for reducing the heat transfer from the outside to the heat preservation layer and the temperature measuring element. The detector is arranged as a multilayer structure, the detector moves with the saggar to measure the temperature during sintering, and the temperature measuring element is kept in a preset temperature range, so that the problem that the detector cannot work in a high-temperature environment is solved, in-situ measurement of the internal temperature field of powder materials in the kiln is realized, and the measurement accuracy is improved.

Description

Technical Field

[0001] This invention relates to the field of temperature measurement technology, and more specifically, to a device for measuring the internal temperature of materials moving relative to a kiln. Background Technology

[0002] Powder sintering commonly employs roller kilns and pusher kilns. These kilns are characterized by powder being placed in a container (such as a sagger), which moves within the kiln, passing through different temperature zones. Due to this characteristic, a temperature gradient distribution exists within the powder in the same sagger. This temperature distribution changes as the sagger's position changes. Because the sagger is in motion, measuring the temperature field within it is extremely difficult. Common methods, such as thermocouples inserted into the kiln channel, can only measure the temperature of the atmosphere within the channel. Infrared thermometers fixed relative to the kiln body can only measure the surface temperature of the powder. The optimal choice for measuring the temperature inside the powder volume is to move the detector along with the container. However, kiln temperatures are often very high (100–1500°C), making it difficult for detectors to operate in such an environment.

[0003] The most common solution is to use a box furnace to simulate the temperature profile of a roller kiln, inserting thermocouples into the powder for measurement during simulated sintering. However, the heating and airflow methods of a box furnace differ from those of a roller kiln, resulting in a slightly different heating process. Therefore, the accuracy of such experimental simulations cannot be guaranteed.

[0004] Another approach is computational simulation. This method requires a very detailed understanding of the material's heat capacity, the heat absorption process, the kiln's heating components, and the airflow field. Few simulations can achieve a high degree of accuracy.

[0005] In the prior art, such as Chinese Patent Application No. 202220618148.1, a furnace temperature detection device for a roller kiln is disclosed, comprising: a furnace body and a thermocouple thermometer. The thermocouple thermometer includes a measuring end. A through hole is formed in the side wall of the furnace body, and the measuring end is inserted into the through hole. A first connecting plate is fixedly sleeved on the side wall of the thermocouple thermometer, and a second connecting plate is fixedly connected to the side wall of the furnace body. A circular hole is formed in the side wall of the second connecting plate, and the measuring end is inserted into the circular hole. The side walls of the first and second connecting plates are detachably connected by an installation mechanism. This device installs the thermocouple thermometer inside the furnace body for temperature measurement, but it cannot measure the temperature field of the material inside the sagger.

[0006] Therefore, it is necessary to propose a device for measuring the internal temperature of materials moving relative to the kiln, in order to at least partially solve the problems existing in the prior art. Summary of the Invention

[0007] The summary section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. The summary section of this invention is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0008] To at least partially solve the above problems, the present invention provides an apparatus for measuring the internal temperature of material moving relative to a kiln, comprising:

[0009] The detector is fixed relative to a moving sagger in the kiln, which is used to carry materials. The detector includes a temperature measuring element, a heat insulation layer, and a thermal insulation layer arranged sequentially from the inside to the outside. The temperature measuring element is used for temperature detection, the heat insulation layer is used to keep the temperature measuring element within a preset operating temperature range during sintering, and the thermal insulation layer is detachably connected to the outside of the heat insulation layer to reduce heat transfer from the outside to the heat insulation layer and the temperature measuring element.

[0010] The probe has one end connected to a temperature measuring element and the other end extending through the insulation layer and the thermal insulation layer to a preset detection point in the material.

[0011] Preferably, the heat-absorbing material in the insulation layer contains one or more of a combination of high heat capacity materials and phase change materials.

[0012] Preferably, the heat-absorbing material in the insulation layer is encapsulated.

[0013] Preferably, the phase change material is any one or a combination of paraffin, PEG, or materials with a temperature range of -50 to 80°C.

[0014] Preferably, the phase change material is paraffin with a narrow molecular weight distribution.

[0015] Preferably, the phase change material is any material with a temperature range of -20 to 60°C.

[0016] Preferably, the thermal insulation layer is made of a porous inorganic material.

[0017] Preferably, the thermal insulation layer is made of a porous ceramic material.

[0018] Preferably, the thermal insulation layer is made of aerogel.

[0019] Preferably, the probe is configured as an armored thermocouple probe.

[0020] Preferably, the detector is connected to any one of the following locations: the inner wall of the sagger, the top of the sagger, and the inner wall of an adjacent sagger.

[0021] Preferably, the thermal insulation layer includes two detachably disposed insulation layer portions, and the opposing surfaces of the two insulation layer portions are respectively provided with a locking groove and a locking block for locking, and the two insulation layer portions are locked together to form a sealed thermal insulation layer structure.

[0022] Preferably, the section of the probe located within the insulation layer is spiral-shaped.

[0023] Preferably, the probe head is inserted into the insulation layer from one end of the detector, surrounds the temperature measuring element once, and then connects to the side of the temperature measuring element near the insertion end.

[0024] Preferably, the probe head is inserted into the insulation layer from one end of the detector, and after the probe head spirals around several times, it is connected to the side of the temperature measuring element near the insertion end; the probe head forms a cylindrical or conical spiral structure.

[0025] Preferably, the device for measuring the internal temperature of materials moving relative to the kiln further includes a heat preservation performance simulation unit, used to simulate the temperature rise of the temperature measuring element when the detector heats up. The heat preservation simulation unit specifically comprises:

[0026] Establish the detector structural model and perform mesh generation for thermal analysis;

[0027] Establish a material library for thermal insulation and heat insulation layers, and preset the parameters of the materials to be selected;

[0028] Temperature load data is loaded onto the outside of the detector model to obtain a temperature distribution cloud map inside the detector structure.

[0029] Acquire temperature data at the temperature measuring element.

[0030] The thermal insulation simulation unit includes a thermal insulation performance evaluation unit, used to evaluate the thermal insulation performance of the insulation layer. Specifically, the thermal insulation performance evaluation unit is as follows:

[0031] Extract nodes from the structural mesh model of temperature measurement elements in several detectors and obtain the initial temperature data and the temperature data after the temperature field is applied at the nodes. Set the difference between the temperature data after the temperature field is applied and the initial temperature data as the temperature fluctuation data.

[0032] The temperature fluctuation data at the nodes is compared with the preset temperature fluctuation range. When the temperature fluctuation data at several nodes does not exceed the preset range, it indicates that the thermal insulation performance of the insulation layer meets the usage requirements.

[0033] Compared with the prior art, the present invention has at least the following beneficial effects:

[0034] This invention provides a device for measuring the internal temperature of materials moving relative to a kiln. The detector is configured with a multi-layer structure. During the sintering process, the detector moves with the sagger to measure the temperature, while keeping the temperature measuring element within a preset temperature range, i.e., the suitable operating temperature of the measuring element. This solves the problem that the detector cannot work in high-temperature environments, realizes in-situ measurement of the internal temperature field of powder materials in the kiln, and improves the accuracy of the measurement.

[0035] The present invention provides an apparatus for measuring the internal temperature of materials moving relative to a kiln. Other advantages, objectives, and features of the present invention will be apparent in part from the following description, and in part will be understood by those skilled in the art through study and practice of the invention. Attached Figure Description

[0036] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0037] Figure 1 This is a schematic diagram of the structure of a device for measuring the internal temperature of materials moving relative to a kiln, according to the present invention.

[0038] Figure 2 This is a schematic diagram of the installation of a device for measuring the internal temperature of materials moving relative to the kiln, according to the present invention, inside the kiln.

[0039] Figure 3 This is a schematic cross-sectional view of the thermal insulation layer in a device for measuring the internal temperature of materials moving relative to a kiln, according to the present invention.

[0040] Figure 4 This is a schematic diagram of the first spiral structure of the probe in a device for measuring the internal temperature of materials moving relative to a kiln, according to the present invention.

[0041] Figure 5 This is a schematic diagram of the second spiral structure of the probe in a device for measuring the internal temperature of materials moving relative to a kiln, according to the present invention.

[0042] Figure 6 This is a schematic diagram of the third spiral structure of the probe in a device for measuring the internal temperature of materials moving relative to a kiln, according to the present invention.

[0043] In the diagram: 1. Detector; 2. Temperature measuring element; 3. Insulation layer; 4. Thermal insulation layer; 5. Detector head; 6. Kiln; 7. Sagger; 8. Upper insulation layer; 9. Slot; 10. Locking block. Detailed Implementation

[0044] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments, so that those skilled in the art can implement it based on the description.

[0045] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0046] Example:

[0047] like Figure 1-2 As shown, the present invention provides an apparatus for measuring the internal temperature of material moving relative to a kiln, comprising:

[0048] The detector 1 is fixed in position relative to the moving sagger 7 in the kiln 6, and the sagger 7 is used to carry materials. The detector 1 includes a temperature measuring element 2, a heat insulation layer 3, and a thermal insulation layer 4 arranged sequentially from the inside to the outside. The temperature measuring element 2 is used to detect the temperature. The heat insulation layer 3 is used to keep the temperature measuring element 2 within a preset working temperature range during the sintering process. The thermal insulation layer 4 is detachably connected to the outside of the heat insulation layer 3 to reduce heat transfer from the outside to the heat insulation layer 3 and the temperature measuring element 2.

[0049] The probe 5 has one end connected to the temperature measuring element 2, and the other end extends through the insulation layer 3 and the thermal insulation layer 4 to a preset detection point in the material.

[0050] The working principle and beneficial effects of the above technical solution are as follows:

[0051] When using a device for measuring the internal temperature of material moving relative to a kiln, the detector 1 is first charged and its storage system is set up. After removing the thermal insulation layer 4, the internal temperature measuring element 2 and the insulation layer 3 are brought to a preset initial temperature range. Then, the thermal insulation layer 4 is installed, and the detector 1 is installed inside the sagger 7. The detector 1 can move simultaneously with the sagger 7, and the probe end of the probe head 5 is placed at a preset probe point inside the sagger 7. When the sagger 7 carries the material and moves in the kiln 6, heat is transferred to the detector 1. The thermal insulation layer 4 isolates the heat, reducing heat transfer from the outside to the insulation layer 3 and the temperature measuring element 2. The insulation layer 3 keeps the temperature measuring element 2 within a preset temperature range during sintering. In this way, as the sagger 7 moves through different temperature zones, the detector 1 can accurately measure the temperature field of the powder moving in the kiln 6, without failing to function due to high-temperature environments.

[0052] The thermal insulation layer is divided into four components, which can be disassembled to expose the internal structure, facilitating the adjustment of the initial temperature of the internal structure, replenishing energy to the detector, and ensuring good sealing when assembled.

[0053] This invention provides a device for measuring the internal temperature of materials moving relative to a kiln. The detector 1 is configured with a multi-layer structure. During the sintering process, the detector 1 moves with the sagger 7 to measure the temperature. At the same time, the temperature measuring element 2 is kept within a preset temperature range, i.e., the suitable working temperature of the measuring element 2. This solves the problem that the detector 1 cannot work in a high-temperature environment, realizes in-situ measurement of the internal temperature field of powder materials in the kiln, and improves the accuracy of the measurement.

[0054] In one embodiment, the measuring element 2 has the functions of wireless signal transmission and wireless charging.

[0055] The working principle and beneficial effects of the above technical solution are as follows:

[0056] Temperature measuring element 2 is composed of electronic components and is used for temperature measurement, data recording, and information transmission. Temperature measuring element 2 has wireless signal transmission and wireless charging capabilities, enabling it to collect temperature measurement data, upload and record the data for easy use.

[0057] In one embodiment, the heat-absorbing material in the insulation layer 3 contains one or more of a combination of a high heat capacity material and a phase change material.

[0058] In one embodiment, the heat-absorbing material in the insulation layer 3 is encapsulated.

[0059] In one embodiment, the phase change material is any one or a combination of paraffin, PEG, or materials with a temperature range of -50 to 80°C.

[0060] In one embodiment, the phase change material is paraffin with a narrow molecular weight distribution.

[0061] In one embodiment, the phase change material is any material with a temperature range of -20 to 60°C.

[0062] The working principle and beneficial effects of the above technical solution are as follows:

[0063] The insulation layer 3 surrounds the temperature measuring element 2. The heat-absorbing material in the insulation layer 3 contains one or more combinations of high heat capacity materials and phase change materials. The phase change temperature of the phase change material is the suitable operating temperature of the temperature measuring element 2. The total heat capacity or phase change heat is large enough to keep the temperature measuring element 2 at a suitable operating temperature throughout the sintering process. The insulation layer 3 is sealed to prevent gas generation during sintering from affecting the interior. The phase change material can be paraffin wax, preferably paraffin wax with a narrow molecular weight distribution, PEG, or any combination of materials with a temperature range of -50 to 80°C (ideally -20 to 60°C).

[0064] In one embodiment, the thermal insulation layer 4 is made of a porous inorganic material.

[0065] In one embodiment, the thermal insulation layer 4 is made of a porous ceramic material.

[0066] In one embodiment, the thermal insulation layer 4 is made of silica aerogel material.

[0067] The working principle and beneficial effects of the above technical solution are as follows:

[0068] The thermal insulation layer 4 is used to reduce heat transfer from the outside to the insulation layer 3 and the temperature measuring element 2. The porous inorganic material may include ceramics, such as metal oxides or metal silicates, and more specifically, silica-based aerogels, aluminosilicates (e.g., chalcogenide framework (CHA) zeolite, Linde type A (LTA) zeolite), porous carbon, porous glass, and clay (e.g., montmorillonite, halloysite).

[0069] In one embodiment, the detector 1 is connected to any one of the following locations: the inner wall of the sagger 7, the top of the sagger 7, and the inner wall of an adjacent sagger 7.

[0070] The probe head 5 is configured as an armored thermocouple probe.

[0071] The working principle and beneficial effects of the above technical solution are as follows:

[0072] The detector 1 is connected to any point on the inner wall of the sagger 7, the top of the sagger 7, or the inner wall of an adjacent sagger 7. This allows the detector 1 to move simultaneously with the sagger 7, facilitating the measurement of the temperature field during material movement.

[0073] Temperature measuring element 2 is connected to one or more probe heads 5. The probe head 5 extends beyond the detector 1 and can be positioned at the location where detection is needed. The probe head 5 can be configured as an armored thermocouple probe. The diameter of the probe head 5 should be as small as possible to reduce heat conduction.

[0074] like Figure 3 As shown, in one embodiment, the thermal insulation layer 4 includes two detachably disposed insulation layer portions 8, and the opposing surfaces of the two insulation layer portions 8 are respectively provided with a snap-fit ​​groove 9 and a snap-fit ​​block 10 for snapping. After the two insulation layer portions 8 are snapped together, a sealed thermal insulation layer 4 structure is formed.

[0075] The working principle and beneficial effects of the above technical solution are as follows:

[0076] The thermal insulation layer 4 is configured as a combination of two insulation layer parts 8. When the two insulation layer parts 8 are arranged vertically, one insulation layer part 8 is fastened on top of the other insulation layer part 8, the slot 9 and the block 10 are engaged, and the opposite surfaces of the two insulation layer parts 8 contact to form a sealing structure.

[0077] Through the above structural design, the rapid installation of the thermal insulation layer 4 is effectively realized. After installation, the thermal insulation layer 4 forms a stepped sealed thermal insulation system at the slot 9 and the block 10, which reduces the heat transfer from the outside to the insulation layer 3 and the temperature measuring element 2, prevents heat from being conducted into the insulation layer 3 through gaps, improves the reliability of the thermal insulation layer 4, and provides better thermal insulation effect.

[0078] In one embodiment, the probe 5 is located in a spiral shape within the insulation layer 3.

[0079] The working principle and beneficial effects of the above technical solution are as follows:

[0080] The probe 5 is positioned in a spiral shape at one end within the insulation layer 3. The probe 5 contacts the material to measure the temperature, and the heat is conducted through the probe 5 to the temperature measuring element 2. The spiral arrangement of the probe 5 after entering the insulation layer 3 extends the length of the probe 5 within the insulation layer 3, which increases the contact time between the heat on the probe 5 and the insulation layer 3. This allows the heat on the probe 5 to be fully conducted into the insulation layer 3, avoiding direct heat conduction to the temperature measuring element 2 and reducing the impact of the temperature conduction of the probe 5 itself on the temperature measuring element 2.

[0081] like Figure 4 As shown, in one embodiment, the probe 5 is inserted into the insulation layer 3 from one end of the detector, surrounds the temperature measuring element 2 once, and is connected to the side of the temperature measuring element 2 near the insertion end.

[0082] The working principle and beneficial effects of the above technical solution are as follows:

[0083] The probe 5 is connected to the temperature measuring element 2 after circling around it. Within the insulation layer 3, the contact length between the probe 5 and the insulation layer 3 is extended to the maximum extent possible, making full use of the space within the insulation layer 3.

[0084] like Figure 5 , 6 As shown, in one embodiment, the probe 5 is inserted into the insulation layer 3 from one end of the detector. After the probe 5 spirals around several times, it is connected to the side of the temperature measuring element 2 near the insertion end. The probe 5 forms a cylindrical or conical spiral structure.

[0085] The working principle and beneficial effects of the above technical solution are as follows:

[0086] The probe 5 is spiraled on one side of the temperature measuring element 2 to form a cylindrical spiral structure, so that the probe 5 is in uniform contact with the temperature measuring element 2 and the insulation layer 3 between the insertion end.

[0087] The probe 5 is spiraled on one side of the temperature measuring element 2, forming a conical spiral structure. The radius of the conical structure gradually decreases from the insertion end to the temperature element 2. This results in a shorter contact length between the probe 5 and the insulation layer 3 near the temperature measuring element 2, and a longer contact length with the insulation layer 3 near the insertion end. This allows more heat to be transferred to the insulation layer 3 near the insertion end, reducing the impact on the temperature measuring element 2.

[0088] In one embodiment, the device for measuring the internal temperature of material moving relative to the kiln further includes a heat preservation performance simulation unit for simulating the temperature rise of the temperature measuring element 2 when the detector 1 heats up. The heat preservation simulation unit specifically comprises:

[0089] Establish the structural model of detector 1 and perform mesh generation for thermal analysis;

[0090] Establish a material library for thermal insulation layer 3 and thermal insulation layer 4, and preset the parameters of the materials to be selected;

[0091] Temperature load data is loaded onto the outside of the detector 1 model to obtain a temperature distribution cloud map inside the detector 1 structure.

[0092] Acquire temperature data at temperature measuring element 2.

[0093] The thermal insulation simulation unit includes a thermal insulation performance evaluation unit, which is used to evaluate the thermal insulation performance of insulation layer 3. The thermal insulation performance evaluation unit is specifically as follows:

[0094] Extract nodes on the structural mesh model of temperature measuring element 2 in several detectors 1 and obtain the initial temperature data and the temperature data after the temperature field is loaded at the nodes. Set the difference between the temperature data after the temperature field is loaded and the initial temperature data as the temperature fluctuation data.

[0095] The temperature fluctuation data at the nodes is compared with the preset temperature fluctuation range. When the temperature fluctuation data at several nodes does not exceed the preset range, it indicates that the thermal insulation performance of the insulation layer 3 meets the usage requirements.

[0096] The working principle and beneficial effects of the above technical solution are as follows:

[0097] During the manufacturing of detector 1, suitable materials need to be selected for the insulation layer 3 and the thermal insulation layer 4 to ensure that the temperature measuring element 2 can be within the preset operating temperature range during sintering. However, manufacturing detector 1 with different materials involves comparing the insulation effects through heating tests, which is time-consuming and costly. Therefore, a thermal insulation performance simulation unit is used to establish a structural model of detector 1 and perform mesh generation. The material parameters to be selected are input into the simulation software to form a material library for the insulation layer 3 and the thermal insulation layer 4. In this way, during simulation calculations, the materials of the insulation layer 3 and the thermal insulation layer 4 can be directly changed to simulate detector 1 with different materials. Then, temperature load data is loaded onto the outside of the detector 1 model. This model is used to evaluate the thermal insulation performance. Therefore, the temperature load data at this time does not refer to accurate material temperature field data. Static loading can be performed using the highest temperature of kiln 6, or dynamic loading can be performed using the temperature curve of kiln 6. The temperature distribution cloud map within the structure is obtained through analysis and calculation. By selecting the temperature data of multiple grid nodes within the temperature measuring element 2, the temperature fluctuation of each point within the temperature measuring element 2 after temperature loading can be obtained. These fluctuations are then used as evaluation indicators. When the temperature fluctuation exceeds the preset range, it indicates that the temperature fluctuation value is large and the heat preservation performance of the detector 1 made of the selected material is poor. In this way, the detector 1 made of the material with the smallest temperature fluctuation value, i.e. the best heat preservation performance, is selected.

[0098] Through the above structural design and simulation calculation of thermal insulation performance, the thermal insulation performance of detector 1 can be evaluated. This helps designers to quickly select better materials for manufacturing detector 1, reduces the difficulty of material selection and testing, provides guidance for the research and development process, and effectively reduces research and development costs, shortens the research and development cycle, and improves the detection accuracy of the device.

[0099] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0100] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0101] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. Other modifications can be easily made by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A device for measuring the internal temperature of material moving relative to a kiln, characterized in that, include: The detector (1) is fixed in position relative to the moving sagger (7) in the kiln (6), and the sagger (7) is used to carry materials; the detector (1) includes a temperature measuring element (2), a heat insulation layer (3) and a thermal insulation layer (4) arranged sequentially from the inside to the outside; the temperature measuring element (2) is used to detect the temperature, the heat insulation layer (3) is used to keep the temperature measuring element (2) within a preset working temperature range during sintering, and the thermal insulation layer (4) is detachably connected to the outside of the heat insulation layer (3) to reduce heat transfer from the outside to the heat insulation layer (3) and the temperature measuring element (2); the heat-absorbing material in the heat insulation layer (3) contains one or more combinations of high heat capacity materials and phase change materials; and the heat-absorbing material is covered; The probe (5) is connected at one end to the temperature measuring element (2), and at the other end extends through the insulation layer (3) and the thermal insulation layer (4) to a preset detection point in the material; the section of the probe (5) located in the insulation layer (3) is spiral.

2. The device for measuring the internal temperature of material moving relative to a kiln according to claim 1, characterized in that, The phase change material is any one or a combination of paraffin, PEG, or materials with a temperature range of -50 to 80°C.

3. The device for measuring the internal temperature of material moving relative to a kiln according to claim 1, characterized in that, The phase change material is paraffin with a narrow molecular weight distribution.

4. The device for measuring the internal temperature of material moving relative to a kiln according to claim 1, characterized in that, The phase change material can be any material with a temperature range of -20 to 60°C.

5. The device for measuring the internal temperature of material moving relative to a kiln according to claim 1, characterized in that, The thermal insulation layer (4) is made of porous inorganic material.

6. The device for measuring the internal temperature of material moving relative to a kiln according to claim 5, characterized in that, The thermal insulation layer (4) is made of porous ceramic material.

7. The device for measuring the internal temperature of material moving relative to a kiln according to claim 5, characterized in that, The thermal insulation layer (4) is made of silica aerogel material.

8. The device for measuring the internal temperature of material moving relative to a kiln according to claim 1, characterized in that, The probe (5) is configured as an armored thermocouple probe.

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