A temperature measuring device based on infrared technology

Abstract

The present invention discloses a temperature measuring device based on infrared technology, comprising a temperature sensor for detecting the temperature at the bottom of a hole, an infrared sensor for detecting the temperature of the kiln shell at the opening of the detection hole, and a control module; the control module determines the risk of spalling or ringing of the furnace lining based on the temperature difference between the two; and a pipe body, the pipe body comprising an inner pipe and an outer pipe, an annular cavity formed between the outer pipe and the inner pipe, the annular cavity filled with a filler that expands when heated, the outer pipe having a hole group formed by a plurality of unit holes penetrating its pipe wall, so that the filler expands from the unit holes to form an expanded convex portion after being heated, and the unit holes of the hole group are distributed on the outer pipe and configured so that the plurality of expanded convex portions form an interference fit with the hole wall of the temperature measuring hole and completely cover the circumference of the outer pipe. The beneficial effect of the present invention is that it can improve the accuracy of temperature measurement of the kiln and improve the stability of the temperature measurement state.

Description

Technical Field

[0001] The invention relates to a temperature measuring device based on infrared technology, which belongs to an optimized design for improving the temperature measurement accuracy and the temperature measurement state stability of a kiln. Background Art

[0002] The lining of a high-temperature industrial kiln is subjected to thermal stress shocks for a long time, and is prone to local peeling or ringing. Lining peeling will cause the metal shell of the kiln to be directly exposed to a high-temperature environment, causing a burn-through accident, and ringing will hinder the flow of materials and cause production interruptions. Both require real-time monitoring and early warning. Although the existing technology CN103308211A uses a temperature sensor in a temperature measuring hole to detect the temperature at the bottom of the hole, it has fundamental defects: First, the roughness of the borehole wall forms an annular air gap, and the huge temperature difference between the high-temperature area at the bottom of the hole and the external environment causes strong convection heat dissipation, causing the temperature detected by the temperature sensor to deviate significantly from the actual value; second, the mechanical vibration and rotational motion during the operation of the kiln body cause the temperature sensor to axially displace or even fall off; third, single-point temperature monitoring cannot identify local damage to the lining, and there is a diagnostic blind spot. Summary of the Invention

[0003] The purpose of the present invention is to provide a temperature measuring device based on infrared technology, which can improve the accuracy of kiln temperature measurement and improve the stability of the temperature measurement state.

[0004] The present invention is achieved through the following technical solutions.

[0005] A temperature measuring device based on infrared technology, comprising a temperature sensor inserted into a temperature measuring hole of a kiln and detecting the temperature at the bottom of the hole, an infrared sensor arranged outside the kiln and detecting the temperature of the kiln shell at the opening of the measuring hole, and a control module;

[0006] The control module is configured to: collect in real time the temperature of the hole bottom detected by the temperature sensor and the temperature of the kiln shell at the hole opening detected by the infrared sensor, and determine the risk of spalling or ringing of the furnace lining based on the temperature difference between the two;

[0007] And a tube body, the tube body includes an inner tube surrounding the temperature sensor, an outer tube integrally connected to the inner tube and attached to the wall of the temperature measuring hole, an annular cavity is formed between the outer tube and the inner tube, the annular cavity is filled with a filling body that expands due to heat, the outer tube has a hole group formed by a plurality of unit holes penetrating its tube wall, so that the filling body bulges out from the unit holes after being heated to form an expanded outer bulge, and the unit holes of the hole group are distributed on the outer tube and configured so that the plurality of expanded outer bulges form an interference fit with the wall of the temperature measuring hole and completely cover the circumference of the outer tube.

[0008] As a further improvement of the present invention, the unit hole is formed with at least one expansion groove on its edge, which extends radially outward and passes through the wall of the outer tube. The extension direction of the expansion groove is suitable for making it have a length in the circumferential direction of the outer tube; the shape of the expansion groove relative to the unit hole is suitable for making the filling body bulge out preferentially from the expansion groove.

[0009] As a further improvement of the present invention, the number of the expansion slots and their relative positions to the unit hole are suitable for forming a two-wing structure of the unit hole, and the tips formed by the two-wing structure point to the bottom of the temperature measuring hole.

[0010] As a further improvement of the present invention, the hole group is divided into a plurality of hole groups spaced apart from each other along the axial direction of the outer tube, and the plurality of unit holes on each hole group are spaced apart along the circumferential direction of the outer tube.

[0011] As a further improvement of the present invention, the unit holes belonging to any two adjacent hole groups are staggered in the circumferential direction of the outer tube.

[0012] As a further improvement of the present invention, the temperature sensor has a temperature probe at one end corresponding to the bottom of the temperature measuring hole, and part of the temperature probe is exposed from the corresponding end of the inner tube; the outer periphery of the remaining main body of the temperature sensor and the inner wall of the inner tube are separated by an insulation layer.

[0013] As a further improvement of the present invention, the inner wall of the inner tube has a radially inward positioning flange corresponding to the intersection of the temperature probe and the main body, and the center of the positioning flange has a through hole that allows the main body to pass through and support the temperature probe.

[0014] As a further improvement of the present invention, thermal conductive paste is filled between the bottom of the temperature measuring hole and one end of the temperature sensor located at the bottom of the hole.

[0015] As a further improvement of the present invention, the volume expansion rate of the filler in the range of 80-200°C is ≥18%, and the thermal conductivity at 800°C is ≥12 W / m·K.

[0016] As a further improvement of the present invention, the filler comprises, by mass percentage, 45%-55% paraffin-based binder, 25%-35% metal thermal conductive powder, 15%-25% ceramic reinforcing fiber, and 3%-8% expanded graphite sheet.

[0017] Beneficial effects of the present invention:

[0018] The infrared sensor captures the temperature of the kiln shell at the orifice in real time, and forms a dynamic temperature difference monitoring model with the temperature at the bottom of the hole detected by the temperature sensor. When the furnace lining peels off, the temperature at the bottom of the hole rises sharply, while the temperature at the orifice drops due to the insulation of the peeling material, and the temperature difference increases abnormally. When the ring thickens, the temperature at the bottom of the hole drops, while the temperature at the orifice rises due to heat accumulation, and the temperature difference decreases abnormally. This temperature difference change mechanism forms a complete monitoring closed loop, realizing the accurate identification and early warning of furnace lining failures.

[0019] When heated, the filling body expands to form a fully covered array of expanded outer protrusions: the interference fit between the expanded outer protrusions and the rough hole wall completely blocks the gas convection channel, eliminating the temperature measurement deviation caused by heat loss; the contact pressure is converted into anti-displacement static friction, effectively suppressing the axial displacement caused by kiln vibration; the viscoelastic properties of the filling body make the expanded outer protrusions a vibration energy dissipator, greatly reducing the mechanical vibration transmitted to the temperature sensor and ensuring the stability of data acquisition. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings to help understand the objects and advantages of the present invention, wherein:

[0021] Figure 1 is a schematic diagram of a temperature measurement device based on infrared technology;

[0022] Figure 2 Schematic diagram of the structure of the tube body and the temperature sensor;

[0023] Figure 3 for Figure 2 A partial enlarged schematic diagram;

[0024] Figure 4 It is a cross-sectional schematic diagram of the tube body and the temperature sensor;

[0025] Figure 5 for Figure 4 A partial enlarged schematic diagram;

[0026] Figure 6 It is a partial cross-sectional schematic diagram of the tube body and temperature sensor. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and implementation examples.

[0028] In this specification, directional terms such as up, down, left, right, front, back, front, back, top, and bottom, which are mentioned or may be mentioned, are defined relative to the configurations shown in the accompanying drawings. The terms "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively. These are relative concepts and may vary depending on the location and usage of the component. Therefore, these or other directional terms should not be construed as restrictive.

[0029] In the field of temperature monitoring for industrial kilns, especially for monitoring the lining condition of high-temperature equipment such as cement rotary kilns and metallurgical blast furnaces, the existing technology, referring to patent CN 103308211A, monitors the lining condition by inserting a temperature sensor into a temperature measuring hole and measuring the temperature at the hole bottom. The kiln lining is formed by high-temperature sintering of refractory castables. Due to its physical properties, the inner wall and bottom of the drilled temperature measuring hole have a naturally rough surface. This irregular surface inevitably creates an uneven gap between the outer wall of the temperature sensor and the hole wall. Existing technologies have significant drawbacks under these operating conditions: First, the temperature at the bottom of the hole, where the flame is directly projected, can reach thousands of degrees Celsius, creating a temperature difference of over 800°C from the external environment. This causes the high-temperature gas to form a strong convection heat dissipation channel through the gap between the rough hole wall and the temperature sensor surface, resulting in a certain degree of heat loss at the bottom of the hole, causing the temperature sensor's detection value to continuously deviate from the actual temperature. Second, the continuous mechanical vibration and periodic rotation of the kiln during operation cause the temperature measuring device to undergo axial displacement within the hole. In severe cases, this can cause the temperature sensor to completely detach from the temperature measuring hole, creating a safety hazard of monitoring interruption and causing vibration, which in turn affects its temperature measurement performance. Furthermore, simply measuring the bottom temperature cannot determine the state of heat conduction along the thickness of the furnace lining. For example, when the furnace lining is partially spalled, although the bottom temperature in the spalled area will increase due to the thinning of the refractory layer, the bottom temperature in the non-spalled area will remain normal. Single-point detection cannot identify this local anomaly.

[0030] The main structure of refractory materials formed by high-temperature sintering has special physical properties: its surface crystalline phase and matrix phase constitute a non-homogeneous complex. The mechanical polishing process is not only difficult to achieve uniform surface finishing, but may also destroy the internal stress balance of the material. More importantly, even if a high cost is invested in surface fine grinding of the hole wall of the temperature measuring hole, the inherent micropores and grain boundary characteristics of the material will still form microscopic gaps during high-temperature expansion, making it impossible to achieve intrinsic sealing. This physical modification not only greatly increases manufacturing costs, but also makes it difficult for the improvement effect to meet ideal requirements.

[0031] Reference Figures 1-6 Based on this, this embodiment shows a temperature measuring device based on infrared technology, which includes a temperature sensor 1 inserted into the temperature measuring hole 63 of the kiln 6 and detecting the temperature at the bottom of the hole, an infrared sensor 2 arranged outside the kiln 6 and detecting the temperature of the kiln shell 61 of the kiln 6 at the mouth of the detection hole, a control module 3, and a pipe body 5.

[0032] Furthermore, a bracket is provided outside the kiln shell 61, on which the infrared sensor 2 is mounted. A transmitter 4 is also provided outside the kiln shell 61 via the bracket. Transmitter 4 is connected to the temperature sensor 1 and infrared sensor 2 via wires. Transmitter 4 receives temperature signals collected by the temperature sensor 1 and infrared sensor 2, converts them into electrical signals, and transmits them to the control module 3. Control module 3 is configured to collect real-time data on the temperature at the bottom of the hole, as detected by the temperature sensor 1, and the temperature of the kiln shell 61 at the hole opening, as detected by the infrared sensor 2. Based on the temperature difference between the two, it determines the risk of spalling or ringing of the furnace lining 62.

[0033] More specifically, the temperature sensor 1 can be a thermocouple, a thermal resistor, an infrared temperature sensor 1 or the like.

[0034] When kiln 6 is operating normally, the temperature at the bottom of the hole is transferred to the orifice, forming a reasonable temperature gradient. If lining 62 delaminates, temperature sensor 1 will immediately detect an abnormal rise in bottom temperature. However, the temperature of kiln shell 61 at the orifice, insulated by the delaminated material, will drop, causing the temperature difference to increase dramatically. Conversely, if ringing forms, the bottom temperature drops due to the insulation of the ringing, while the orifice temperature rises due to heat accumulation, causing the temperature difference to increase in the opposite direction. By analyzing the temperature difference, control module 3 can determine the risk of delaminate or ringing of lining 62, forming a complete monitoring closed loop. Through a stable temperature measurement environment and a multi-sensor collaborative analysis mechanism, a highly reliable early warning system for the health of lining 62 is formed.

[0035] The tube body 5 comprises an inner tube 51 surrounding the temperature sensor 1 and an outer tube 52 integrally connected to the inner tube 51 and attached to the wall of the temperature measuring hole 63. An annular cavity is formed between the outer tube 52 and the inner tube 51. The annular cavity is filled with a filler 53, which has the characteristic of expanding when heated. The outer tube 52 has a plurality of unit holes 521 extending through its wall. These unit holes 521 are arranged in a specific space to form a hole cluster covering the wall. When the temperature sensor 1 and the tube body 5 are inserted into the temperature measuring hole 63, the heat from the kiln 6 causes the temperature of the tube body 5 to rise through heat conduction. Under the action of thermal excitation, the filler 53 in the annular cavity expands in volume. The expansion pressure drives the filler 53 to continuously bulge outward from the unit holes 521. The bulging material forms an expanded protrusion 531 at the orifice, which protrudes outward from the outer wall of the outer tube 52. These protrusions form densely distributed points on the surface of the tube body 5. The distribution of the unit holes 521 of the hole cluster on the outer tube 52 is configured so that the multiple expanded outer protrusions 531 form an interference fit with the wall of the temperature measuring hole 63 and completely cover the distribution of the circumferential unit holes 521 of the outer tube 52. That is, the edges of the expanded outer protrusions 531 are ensured to overlap with each other in the circumferential direction of the tube body 5, so that there is no blind spot. The formation of the expanded outer protrusions 531 directly produces three technical effects: first, the expanded material completely fills the microscopic gaps in the hole wall, establishing a continuous sealing barrier between the tube wall and the hole wall, completely blocking the gas flow channel and eliminating the interference of convective heat dissipation on temperature detection; second, the expanded outer protrusions 531 form a full-area interference fit with the rough hole wall, and the generated radial pressure is converted into a strong static friction force, effectively resisting the axial displacement caused by kiln vibration and rotation. At the same time, the viscoelastic properties of the filler 53 itself make the expanded outer protrusions 531 a natural shock-absorbing structure, absorbing mechanical vibration energy through material deformation, ensuring the stable operation of the temperature sensor 1.

[0036] More specifically, the edge of each unit hole 521 is machined to form at least one expansion slot 522 extending radially outward. This expansion slot 522 completely penetrates the wall of the outer tube 52 and extends along the circumferential direction of the outer tube 52. The key lies in the shape of the expansion slot 522, which, relative to the shape of the unit hole 521, is adapted to allow the filler 53 to preferentially expand from the expansion slot 522. More specifically, the expansion slot 522 is an elongated slot with a width significantly smaller than the diameter of the unit hole 521, thus ensuring preferential expansion of the filler 53. When the filler 53 expands due to heat within the annular cavity, the preferential expansion mechanism causes the filler 53 to quickly form a strip-like protrusion structure along the circumferential extension direction of the expansion slot 522 during the initial stages of thermal expansion. First, the circumferential extension length of the expansion groove 522 allows the bulging material to naturally form a wider strip-shaped expansion body. The strip-shaped protrusions of adjacent units overlap and fuse with each other in the circumferential direction, which improves the circumferential coverage rate and completely eliminates the sealing blind spot. Secondly, the strip-shaped protrusions formed preferentially establish early anchor points on the surface of the hole wall. When the main part 12 of the subsequent unit hole 521 bulges, the formed circumferential strips provide additional support, which increases the contact pressure between the final expanded outer protrusion 531 and the hole wall, significantly enhancing the anti-displacement friction. At the same time, the long strip-shaped expansion body formed by the expansion groove 522 has a larger surface area to volume ratio, which produces a more sufficient internal friction effect when subjected to vibration loads. These synergistic reinforcements enable this implementation case to enhance the technical effects achieved in terms of heat convection blocking, axial displacement suppression, vibration attenuation, etc.

[0037] In a further refinement of the depth of the expansion slots 522 within the unit holes 521 of the outer tube 52 of the tubular body 5, two or more expansion slots 522 of a specific geometric configuration are symmetrically arranged around the edges of each unit hole 521. Their spatial distribution forms a two-wing structure symmetrically extending in a V-shape, centered on the unit hole 521. The two-wing structure's spatial orientation is controlled: the extension trajectory of the expansion slots 522 is configured so that the tip formed by the intersection of the two wings constantly points toward the bottom of the temperature measuring hole 63, creating a wedge-shaped anchor with clear vector characteristics. When the filler 53 expands due to heat within the annular cavity, due to the shape of the expansion slots 522 relative to the unit holes 521, the filler 53 preferentially bulges outward from the two-wing channels, rapidly forming a hardened protrusion with its tip pointing toward the bottom of the hole on the contact surface of the hole wall. This directional wedge-shaped structure can significantly enhance the anti-slip performance: when the kiln body vibrates or rotates to generate an axial pulling force that causes the tube body 5 to move outward, the tips of the two wing structures point toward the bottom of the hole, and the two wing structures and the rough peaks of the hole wall produce a reverse bite effect: the self-locking angle formed by the two wing structures and the hole wall forms a mechanical self-locking mechanism. At this time, to induce slippage, the additional resistance torque determined by the geometric structure must be overcome; the symmetrically distributed two-wing structures evenly transmit the reverse bite force to the entire circumference of the tube body 5, avoiding local failure caused by stress concentration. This directional anchoring mechanism enhances the system's ability to resist axial slip.

[0038] In optimizing the spatial layout of the group of unit holes 521 in the outer tube 52 of the tube body 5, the group is divided into multiple independent hole groups along the axial direction of the outer tube 52, each of which contains multiple unit holes 521 regularly arranged circumferentially along the outer tube 52. In practice, the axial spacing between each hole group is determined based on actual application requirements to ensure that adjacent hole groups are in different axial temperature gradient zones. Within a single hole group, the unit holes 521 are distributed with uniform angular spacing in the circumferential direction, ensuring that the center lines connecting any two adjacent unit holes 521 form equal central angles. First, the axial spacing design of the hole groups makes the expansion points of the filling body 53 discretely distributed in multiple independent temperature zones. When there is axial temperature fluctuation in the kiln 6, the expansion pressure of the filling body 53 in each hole group remains relatively balanced, avoiding material extrusion deformation caused by local over-expansion; secondly, the circumferential uniform distribution ensures that each unit hole 521 is subjected to a similar pressure gradient during thermal expansion, and all expanded outer protrusions 531 reach the designed size synchronously, eliminating the weak sealing points caused by differences in the degree of expansion; at the same time, the dispersed release of expansion energy significantly reduces the stress concentration at a single expansion point, and no penetrating shear band will be formed inside the filling body 53, and the fatigue life of the material is extended compared to the disordered distribution.

[0039] In the optimized spatial layout of the hole groups in the outer tube 52 of the tubular body 5, the unit holes 521 of any two adjacent hole groups are staggered in the circumferential direction of the outer tube 52. More specifically, adjacent hole groups are arranged using the principle of circumferential stagger: when the unit holes 521 of the first hole group are at a specific circumferential position, the unit holes 521 of the adjacent second hole group are precisely offset in the circumferential angle by a predetermined phase difference. This spatial arrangement enables the unit holes 521 of adjacent hole groups to form a complementary distribution network on the circumferential projection of the tubular body 5, with alternating expansion points present on the axial line connecting any circumferential position. This staggered design improves the effect through geometric optimization: First, when the filler body 53 expands due to heat, the expansion protrusions 531 formed by the unit holes 521 of the first hole group produce spaced areas on the circumferential surface, and the expansion points of the second hole group arranged in a staggered manner are located exactly in these spaced areas, forming a spatially complementary coverage pattern, completely eliminating the circumferential coverage blind spots; second, the staggered structure evenly disperses the expansion pressure in the circumferential direction, avoiding local pressure concentration caused by the same-phase expansion, and ensuring that all expansion protrusions 531 form a balanced contact state with the hole wall; at the same time, the staggered expansion points at different axial positions form a multi-stage buffer unit, which produces alternating deformation when the tube body 5 is subjected to axial load, effectively suppressing the transmission of vibration energy. This layout achieves seamless circumferential coverage of the expansion protrusions 531, improves the thermal sealing performance to a state without periodic leakage, and improves the overall axial displacement resistance.

[0040] In the protective structure of the temperature sensor 1 assembly, a temperature sensing probe 11 is provided at one end of the temperature sensor 1 extending toward the bottom of the temperature measuring hole 63. The front end of the probe passes through the reserved channel at the end of the inner tube 51 and is directly exposed to the high-temperature environment, ensuring direct contact with the refractory material at the bottom of the hole to obtain accurate temperature; the main body 12 of the temperature sensor 1 is completely covered inside the inner tube 51, and a continuous and dense insulation layer 54 is provided between its outer peripheral surface and the inner wall of the inner tube 51, so that the structure of the radial heat conduction path is: from the outside to the inside, the outer tube 52 contacting the high-temperature hole wall, the filling body 53 in the annular cavity, the wall of the inner tube 51 and the insulation layer 54, forming a four-level thermal resistance barrier. This structure achieves dual protection by optimizing the heat transfer path: First, the insulation layer 54 directly blocks the heat radiation transfer between the sensor body 1 and the inner tube 51, significantly reducing the operating temperature of the main body 12. Second, the four-level thermal resistance structure increases the thermal resistance effect by extending the heat conduction path. When high-temperature heat is transferred inward from the outer tube 52, each material interface produces heat reflection and heat absorption, significantly attenuating the heat reaching the sensor body 1. This keeps the temperature of the main body 12 within a safe threshold and completely avoids the risk of high-temperature damage. At the same time, the temperature probe 11 maintains direct contact, ensuring that temperature measurement accuracy is not affected by the insulation layer, forming a mechanism for the sensor 1 to achieve "contact-based precise temperature measurement" and "non-contact main body protection."

[0041] In the fixed structure of temperature sensor 1, a radially inward-facing annular positioning flange 511 is installed on the inner wall of inner tube 51, corresponding to the junction where temperature probe 11 and main body 12 meet. This flange and inner tube 51 are manufactured using the same material and an integral molding process. A through-hole with a diameter matching the outer diameter of temperature sensor 1 is defined at its center. During installation, temperature sensor 1's main body 12 passes through the through-hole, while the base of temperature probe 11 is precisely supported by the flange end face. When kiln vibrations are transmitted to tube body 5, the inner wall of the through-hole of positioning flange 511 forms a tight fit with the main body of temperature sensor 1, directly suppressing the radial swing tendency of temperature sensor 1 and thereby improving the stability of its temperature sensing state.

[0042] To treat the interface between the temperature probe 11 and the hole bottom, thermal paste is filled between the bottom surface of the temperature measuring hole 63 and the end of the temperature sensor 1 probe. Before inserting the temperature probe 11 into the hole, a paste-like thermal conductive material is evenly applied to the rough surface of the hole bottom. Once the probe is pressed into place, the thermal paste, under pressure, fills the microscopic gap between the probe end face and the hole bottom, forming a continuous heat-conducting medium layer.

[0043] In this embodiment, the physical properties of the filler 53 are limited to the following requirements: a volume expansion rate of ≥18% in the 80-200°C range and a thermal conductivity of ≥12 W / m·K at 800°C. When the kiln 6 is started from a cold state and heated to the 80-200°C range, the filler 53 undergoes a significant phase change and expansion. This expansion rate of ≥18% ensures a sufficient volume increase of the material within the annular cavity. This expansion generates sufficient pressure to drive the filler 53 fully out of the unit holes 521, allowing the expanded protrusion 531 to reach the designed dimensions and forcefully press into the micro-gap of the hole wall. This critical parameter ensures the adequacy of the sealing layer. If the expansion rate is insufficient, the rough peaks and valleys of the hole wall cannot be completely filled, resulting in residual gas leakage channels. Under steady-state high-temperature conditions of the kiln 6, the filler 53 acts as a continuous medium within the annular cavity. Its thermal conductivity of ≥12 W / m·K suppresses expansion non-uniformity caused by radial temperature differences and maintains the shape stability of the expanded protrusion 531 in high-temperature environments.

[0044] In this embodiment, filler 53 comprises, by mass, 45%-55% paraffin-based binder, 25%-35% metal thermally conductive powder, 15%-25% ceramic reinforcing fibers, and 3%-8% expanded graphite flakes. The paraffin-based binder, acting as a continuous phase matrix, undergoes a solid-liquid phase transition between 80°C and 200°C, generating a fundamental expansion force. The metal thermally conductive powder supports high-temperature thermal conductivity. The ceramic reinforcing fibers restrict matrix flow deformation, improving compressive strength and enhancing interfacial heat diffusion. The expanded graphite flakes utilize interlayer expansion properties to synergistically amplify volume increments, resulting in filler 53 possessing the physical properties described above.

[0045] Finally, it should be noted that the above implementation cases are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above implementation cases, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above implementation cases, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the implementation cases of the present invention.

Claims

1. A temperature measuring device based on infrared technology, characterized in that: It comprises a temperature sensor (1) inserted into a temperature measuring hole (63) of a kiln (6) and detecting the temperature at the bottom of the hole, an infrared sensor (2) arranged outside the kiln (6) and detecting the temperature of a kiln shell (61) of the kiln (6) at the opening of the measuring hole, and a control module (3); The control module (3) is configured to: collect in real time the temperature of the hole bottom detected by the temperature sensor (1) and the temperature of the hole opening kiln shell (61) detected by the infrared sensor (2), and judge the risk of spalling or ringing of the furnace lining (62) based on the temperature difference between the two; and a tube body (5), the tube body (5) comprising an inner tube (51) surrounding the temperature sensor (1), an outer tube (52) integrally connected to the inner tube (51) and attached to the hole wall of the temperature measuring hole (63), an annular cavity being formed between the outer tube (52) and the inner tube (51), the annular cavity being filled with a filling body (53) that expands when heated, the outer tube (52) having a hole group formed by a plurality of unit holes (521) penetrating the tube wall, so that the filling body (53) expands from the unit holes (521) to form an expanded outer convex portion (531) after being heated, and the distribution of the unit holes (521) of the hole group on the outer tube (52) being configured such that the plurality of expanded outer convex portions (531) form an interference fit with the hole wall of the temperature measuring hole (63) and completely cover the circumference of the outer tube (52).

2. The temperature measuring device based on infrared technology according to claim 1, characterized in that: The unit hole (521) is formed on its edge with at least one expansion groove (522) extending radially outward and penetrating the wall of the outer tube (52); the extension direction of the expansion groove (522) is suitable for having a length in the circumferential direction of the outer tube (52); the shape of the expansion groove (522) relative to the unit hole (521) is suitable for allowing the filling body (53) to bulge out preferentially from the expansion groove (522).

3. The temperature measuring device based on infrared technology according to claim 2, characterized in that: The number of the expansion slots (522) and their relative positions to the unit hole (521) are suitable for forming a two-wing structure of the unit hole (521), and the tips formed by the two-wing structure point to the bottom of the temperature measuring hole (63).

4. The temperature measuring device based on infrared technology according to claim 1, characterized in that: The hole group is divided into a plurality of mutually spaced hole groups along the axial direction of the outer tube (52), and the plurality of unit holes (521) on each hole group are distributed at intervals along the circumferential direction of the outer tube (52).

5. The temperature measuring device based on infrared technology according to claim 4, characterized in that: The unit holes (521) belonging to any two adjacent hole groups are arranged staggered with each other in the circumferential direction of the outer tube (52).

6. The temperature measuring device based on infrared technology according to claim 1, characterized in that: The temperature sensor (1) has a temperature probe (11) at one end corresponding to the bottom of the temperature measuring hole (63), and a portion of the temperature probe (11) is exposed from the corresponding end of the inner tube (51); the outer periphery of the remaining main body (12) of the temperature sensor (1) and the inner wall of the inner tube (51) are separated by a heat insulation layer (54).

7. The temperature measuring device based on infrared technology according to claim 6, characterized in that: The inner wall of the inner tube (51) has a radially inward positioning flange (511) corresponding to the intersection of the temperature sensing probe (11) and the main body (12), and the center of the positioning flange (511) has a through hole that allows the main body (12) to pass through and support the temperature sensing probe (11).

8. The temperature measuring device based on infrared technology according to claim 1, characterized in that: Thermal conductive paste is filled between the bottom of the temperature measuring hole (63) and one end of the temperature sensor (1) at the bottom of the hole.

9. The temperature measuring device based on infrared technology according to claim 1, characterized in that: The volume expansion rate of the filler (53) in the range of 80-200°C is ≥18%, and the thermal conductivity at 800°C is ≥12W / m·K.

10. The temperature measuring device based on infrared technology according to claim 9, characterized in that: The filler (53) comprises, by mass percentage, 45%-55% of a paraffin-based binder, 25%-35% of a metal heat-conducting powder, 15%-25% of ceramic reinforcing fibers, and 3%-8% of expanded graphite sheets.

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