A quick-changeable continuous temperature measuring device for measuring molten metal

Abstract

The present application belongs to the technical field of continuous temperature measurement in metallurgical industry, and particularly relates to a quick-replaceable continuous temperature measurement device for measuring molten metal. The device comprises an outer protective body and an assembled thermocouple. The outer protective body is fixedly installed in a mounting hole provided in the side wall or bottom of a molten metal containing vessel, and the closed end of the outer protective body is arranged in the molten metal containing vessel. The open end of the outer protective body is limited by an end limiting mechanism arranged on the outer wall of the molten metal containing vessel. The assembled thermocouple is inserted into the outer protective body and detachably connected with the outer protective body. The assembled thermocouple is used for continuously measuring the temperature of the molten metal. The present application has the characteristics of quick replacement, safety against liquid leakage, long service life of components, fast response speed, wide temperature measurement range and low average cost.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of continuous temperature measurement in the metallurgical industry, and particularly relates to a quick-replaceable continuous temperature measurement device for measuring molten metal. BACKGROUND

[0002] Temperature is a core parameter related to product quality, production efficiency and energy consumption control in the metal smelting industry. Real-time, continuous and accurate temperature measurement plays an irreplaceable role in improving product quality, increasing production, reducing energy consumption and achieving automated production.

[0003] The thermocouple continuous temperature measurement technology based on the Seebeck effect realizes temperature measurement through the thermoelectric potential generated by the temperature difference in the loop composed of two different metals. Among them, K-type, N-type, S-type, R-type and B-type high-temperature thermocouples are commonly used temperature measurement elements.

[0004] However, the temperature measurement environment of molten metal is extremely harsh. The metal thermocouple directly inserted into the molten metal will be dissolved and damaged due to a series of physical and chemical changes. This puts extremely high requirements on the thermocouple protection tube, which needs to meet the performance of high temperature resistance, thermal shock resistance, erosion resistance, corrosion resistance, high temperature bending resistance, etc. At the same time, the production unit and process characteristics also require the thermocouple to have good real-time performance, high precision, safety and reliability, economy and a longer service life under harsh working conditions. Therefore, the development of reliable and efficient molten metal temperature measurement technology and device has become a key problem to be solved in the metallurgical industry.

[0005] In recent years, with the continuous promotion of various refining and heating technologies in the industry, the molten metal continuous temperature measurement technology has been continuously developing and progressing, but the existing technology still has many shortcomings, such as measurement accuracy is easily affected, safety needs to be improved, service life is short, economy is not good, dynamic response speed is slow, etc., which is difficult to fully meet the actual production needs.

[0006] The patent with publication number CN200952958Y and the name of blackbody cavity temperature measurement sensor for continuous measurement of molten metal temperature includes a temperature measurement tube unit and a connecting tube, and the structural key points are that the temperature measurement tube unit is composed of inner and outer double-layer sleeves, the inner sleeve is open at both ends, the outer sleeve is open at one end and closed at the other end; the connecting tube is used to connect the temperature measurement tube unit and the temperature measurement probe. Although the sensor of this measurement method has played a certain role in the progress of the steelmaking continuous casting technology in the metallurgical industry within a certain period of time, with the long-term large-scale application of the sensor, the pollution problem of the optical lens and the light path of the temperature measurement probe has broken out on a large scale, and the pollution of the lens and the light path directly affects the accuracy of temperature measurement. In order to solve the pollution problem of the optical lens, although the method of adding an air pipe on the connecting tube is adopted, this method can only prevent the pollution of the optical lens and the light path by harmful gases generated at high temperature to a certain extent, and cannot fundamentally solve the problem, and increases the complexity of the installation and use of the temperature measurement device to a certain extent. At the same time, the response speed of the blackbody cavity temperature measurement sensor is slow, which is not conducive to the system overheating control.

[0007] The patent with publication number CN105841834A and the name of device for measuring temperature of molten metal has a thermocouple and an external protective body, the thermocouple is arranged in a ceramic tube closed at one end, the external protective body surrounds the ceramic tube closed at one end, an annular cavity is formed between the ceramic tube closed at one end and the inner surface of the external protective body, the cavity can be filled with metal oxide and aluminum, and the filling form can be powder or sleeve, etc. The device described above has the following problems in actual application: ① the thermocouple can only be protected to a certain extent in this structure, and the cracking effect of harmful gases on the thermocouple cannot be fundamentally eliminated. The reason is that the oxygen reducing agent aluminum cannot react with harmful gases such as carbon monoxide or silicon monoxide to form stable substances at high temperature, and can only occupy a part of the oxygen in the annular space or occupy a part of the annular space; the oxygen reducing agent aluminum cannot prevent the formation of harmful gases such as silicon monoxide or carbon monoxide in the internal protective body under the influence of high temperature of molten metal; the oxygen reducing agent aluminum and metal oxide cannot play the role of isolating harmful gases. Therefore, this kind of device can only slightly prolong the service life of the thermocouple. ② The structural characteristics lead to that the temperature measurement device is only a disposable device, such as in the molten steel temperature measurement of continuous casting tundish, the service period is only one pouring, and the longest is only ten to twenty hours, and the platinum-rhodium alloy wire of the thermocouple element is a precious metal with high cost, the structure leads to that the wire cannot be reused and cannot be efficiently recycled, which indirectly shortens the service life of the wire and increases the use cost. ③ The dynamic temperature response is slow. SUMMARY

[0008] To address the aforementioned technical problems, the present invention aims to provide a quick-replaceable continuous temperature measuring device for measuring molten metal, thereby achieving the goals of quick replacement, long service life, faster response speed, and leak-proof safety.

[0009] This invention provides a quick-changeable continuous temperature measuring device for measuring molten metal, comprising an outer protective body and an assembled thermocouple. The outer protective body is fixedly installed in a mounting hole provided on the side wall or bottom of a molten metal container, and the closed end of the outer protective body is placed inside the molten metal container. The open end of the outer protective body is limited by an end limiting mechanism provided on the outer wall of the molten metal container. The assembled thermocouple is inserted into the outer protective body and is detachably connected to the outer protective body. The assembled thermocouple is used for continuous temperature measurement of the molten metal.

[0010] The outer protective body includes an outer sheath, a calibration tube, a fast response head, and an embedded threaded sleeve. One end of the outer sheath, placed inside the molten metal container, is equipped with a fast response head to improve the dynamic temperature measurement response speed. The inner wall of the outer sheath is provided with a calibration tube and an embedded threaded sleeve located at the open end of the inner wall. One end of the calibration tube is open, and the other end is closed. The openings of the calibration tube and the outer sheath face the same direction. The calibration tube is used to isolate harmful gases generated by the high temperature of the molten metal from the outer sheath. The embedded threaded sleeve is used for quick connection with the assembled thermocouple.

[0011] The outer sheath is made of aluminum-carbon, Mo-based cermet, or boron nitride.

[0012] The calibration tube is made of corundum, molybdenum disilicide, or mullite.

[0013] The outer sheath has a conical structure, with the outer diameter of the open end of the outer sheath being less than or equal to 75 mm and the outer diameter of the closed end of the outer sheath being greater than or equal to 55 mm; the inner cavity of the outer sheath is cylindrical with an inner cavity diameter of 14-20 mm.

[0014] The calibration tube has an inner diameter of less than or equal to 10 mm and a thickness of greater than or equal to 2.2 mm.

[0015] The material of the fast response head is a metal-ceramic composite material or a metal-based high-temperature alloy; the material of the embedded threaded sleeve is high-strength stainless steel.

[0016] The outer protective body needs to be pre-placed in the mounting hole on the side wall or bottom of the molten metal container. The closed end of the outer protective body should be inserted perpendicularly to the wall of the molten metal container, and the ratio of the depth of insertion into the molten metal to the length of the outer protective body should be greater than or equal to 1 / 3.

[0017] The assembled thermocouple includes a temperature measuring tube, a thermocouple element, a leak-proof ring, and an external connector. One end of the temperature measuring tube is open, and the other end is closed. The thermocouple element is placed inside the temperature measuring tube, and the end of the thermocouple element is provided with an external connector. The open end of the temperature measuring tube is inserted into the external connector. The external connector is secured to the temperature measuring tube by the leak-proof ring, and the external connector is threadedly connected to the outer protective body.

[0018] The leak-proof ring is made of a high-silicon aluminum-based alloy, which consists of 80%-87% aluminum, 10%-14% silicon, 0.5%-1.1% magnesium, and 0.1%-0.25% additives.

[0019] Alternatively, the leak-proof ring may be made of a fire-resistant sealing material that melts rapidly at temperatures above 550°C, gelatinizes, or expands several times its original size.

[0020] The temperature measuring tube is made of corundum and has a reinforced coating on its surface; the inner diameter of the temperature measuring tube is less than or equal to 5 mm and the wall thickness is greater than or equal to 1.5 mm.

[0021] The end limiting mechanism includes a fixed flange, a clamping seat, and a wedge-shaped locking block. The fixed flange is fixed to the mounting hole on the side wall or bottom of the container holding the molten metal. The fixed flange is provided with locking pins located on both sides of the mounting hole, and the locking pins are provided with locking pin holes. The clamping seat is located on the outside of the fixed flange. The clamping seat is provided with two through holes for the locking pins to pass through. The clamping seat is locked by the wedge-shaped locking block passing through the locking pin holes on the locking pins, thereby pressing the clamping seat against the outer protective body.

[0022] The advantages and beneficial effects of this invention are:

[0023] 1. This invention adopts a modular assembly technology, which allows for rapid replacement of assembled thermocouples, bringing the following advantages: ① It enables the reuse of assembled thermocouples, allowing them to be used in multiple casting cycles, greatly extending the effective service life of thermocouple elements and reducing enterprise operating costs; ② By replacing assembled thermocouple elements online, it is possible to achieve accurate temperature measurement throughout the entire process and range of continuous casting tundish from drying to casting, expanding the temperature measurement range to 0~1600℃ or even wider; ③ This assembly method facilitates the recycling of precious metal components, such as platinum-rhodium alloys, greatly reducing the operating cost of continuous temperature measurement devices.

[0024] 2. The present invention adopts a safe structural design, which can completely eliminate the risk of leakage caused by accidental breakage of the continuous temperature measuring device, making the temperature measuring system safe and reliable.

[0025] 3. The combined use of high-density calibration tubes and coated temperature measuring tubes can effectively isolate harmful gases generated by the high temperature of molten metal in the outer sheath, significantly improving the service life of thermocouple elements.

[0026] 4. The use of a fast response head improves the response speed of dynamic temperature measurement, effectively assists in the control of system overheating, saves energy and reduces consumption, and effectively reduces enterprise operating costs. Attached Figure Description

[0027] Figure 1 This is a longitudinal sectional view of a quick-change continuous temperature measuring device for measuring molten metal according to the present invention.

[0028] Figure 2 This is a schematic diagram of the closed end of the continuous temperature measuring device in this invention;

[0029] Figure 3 This is a schematic diagram of the assembly end of the continuous temperature measuring device in this invention;

[0030] Figure 4 This is a schematic diagram of the end limiting mechanism of the external connector in this invention.

[0031] In the diagram: 1. Outer sheath; 2. Calibration tube; 3. Fast response head; 4. Temperature measuring tube; 5. Thermocouple element; 6. Leak-proof ring; 7. Embedded threaded sleeve; 8. External connector; 9. Fixed flange; 10. Compression seat; 11. Container wall; 12. Insulation layer; 13. Permanent layer; 14. Working layer; 15. Sealing brick; 16. Wedge-shaped locking block. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] See Figures 1 to 4 As shown, the present invention provides a quick-changeable continuous temperature measuring device for measuring molten metal, comprising an outer protective body and an assembled thermocouple. The outer protective body is fixedly installed in a mounting hole provided on the side wall or bottom of a molten metal container, and the closed end of the outer protective body is placed inside the molten metal container. The open end of the outer protective body is limited by an end limiting mechanism provided on the outer wall of the molten metal container. The assembled thermocouple is inserted into the outer protective body and is detachably connected to the outer protective body. The assembled thermocouple is used for continuous temperature measurement of molten metal.

[0034] In embodiments of the present invention, the outer protective body needs to be pre-placed in the mounting hole on the side wall or bottom of the molten metal container. The closed end of the outer protective body should be inserted perpendicularly to the wall of the molten metal container, and the ratio of the depth of insertion into the molten metal to the length of the outer protective body is greater than or equal to 1 / 3.

[0035] See Figures 1 to 3As shown, in an embodiment of the present invention, the outer protective body includes an outer sheath 1, a calibration tube 2, a fast response head 3, and an embedded threaded sleeve 7. The outer sheath 1, placed inside the molten metal container, has a fast response head 3 at one end for improving the dynamic temperature measurement response speed. The fast response head 3 is partially embedded in the inner end of the outer sheath 1. The inner wall of the outer sheath 1 has a calibration tube 2 and an embedded threaded sleeve 7 embedded in the open end of the inner wall. One end of the calibration tube 2 is open, and the other end is closed. The openings of the calibration tube 2 and the outer sheath 1 face the same direction. The calibration tube 2 is used to isolate harmful gases generated by the high temperature of the molten metal from the outer sheath 1. The embedded threaded sleeve 7 is used for quick connection with a pre-assembled thermocouple, allowing for rapid replacement of the pre-assembled thermocouple.

[0036] In embodiments of the present invention, the outer sheath 1 may be made of materials including but not limited to aluminum carbon, Mo-based cermet or boron nitride, with relatively inexpensive aluminum carbon being preferred.

[0037] The outer sheath 1 has a conical structure. Its shape is close to cylindrical within a 35mm distance from the open end and a 200mm distance from the closed end. The outer diameter of the open end of the outer sheath 1 is less than or equal to 75mm, and the outer diameter of the closed end of the outer sheath 1 is greater than or equal to 55mm. The middle section of the outer sheath 1 is a tapered transition section with a gradually changing diameter. The inner cavity of the outer sheath 1 is cylindrical with an inner cavity diameter of 14-20mm.

[0038] In embodiments of the present invention, the optional materials for the calibration tube 2 include, but are not limited to, corundum, molybdenum disilicide, or mullite, with corundum tubes offering better cost-effectiveness and temperature resistance being preferred. The calibration tube 2 has an inner diameter less than or equal to 10 mm, a thickness greater than or equal to 2.2 mm, and a straightness less than or equal to 1‰.

[0039] In embodiments of the present invention, the materials that can be selected for the fast response head 3 include, but are not limited to, metal-ceramic composite materials or metal-based high-temperature alloys, such as cobalt-based alloys and alumina-based ceramic composite materials. The use of the fast response head 3 significantly improves the response speed of dynamic temperature measurement. The materials of the embedded threaded sleeve 7 include, but are not limited to, high-strength stainless steel, such as 316 stainless steel and Nitronic 60 alloy.

[0040] See Figures 1 to 3 As shown in the embodiment of the present invention, the assembled thermocouple includes a temperature sensing tube 4, a thermocouple element 5, a leak-proof ring 6, and an external connector 8. One end of the temperature sensing tube 4 is open, and the other end is closed. The opening of the temperature sensing tube 4 and the outer sheath 1 face the same direction. The thermocouple element 5 is placed inside the temperature sensing tube 4, and the end of the thermocouple element 5 is provided with an external connector 8. The open end of the temperature sensing tube 4 is inserted into the external connector 8. The external connector 8 is secured to the temperature sensing tube 4 by the leak-proof ring 6, and the external connector 8 is threadedly connected to the outer protective body. The assembled thermocouple can be quickly assembled and disassembled from the outer protective body through the external connector 8.

[0041] Specifically, the leak-proof ring 6 is embedded in the annular groove at the front end of the external connector 8. The leak-proof ring 6 is made of a high-silicon aluminum-based alloy, and the composition of the high-silicon aluminum-based alloy is 80%-87% aluminum, 10%-14% silicon, 0.5%-1.1% magnesium, and 0.1%-0.25% additives.

[0042] Alternatively, the leak-proof ring 6 can be made of a fire-resistant sealing material that melts rapidly at temperatures above 550°C, gelatinizes, or expands several times its original size. The fixing method of the leak-proof ring 6 is not limited to an interference fit. By implementing a leak-proof structure design through the leak-proof ring 6, the risk of leakage from the continuous temperature measuring device due to accidental breakage can be completely eliminated. When the continuous temperature measuring device breaks accidentally in the molten metal section, the molten metal cannot overflow to the outside through the gap between the quickly replaceable assembly thermocouple and the outer protective body due to the gelatinized seal of the leak-proof ring 6, thus completely eliminating the risk of leakage at that point. Combined with the high-temperature insulating ceramic adhesive sealing and fixing technology of the thermocouple element 5, it ensures that the continuous temperature measuring device will not leak due to accidental breakage.

[0043] In this embodiment of the invention, the temperature measuring tube 4 is made of corundum and coated with a reinforcing coating. Specifically, the core material of the temperature measuring tube 4 is high-purity alumina with a content of not less than 99%. The inner diameter of the temperature measuring tube 4 is less than or equal to 5 mm, the wall thickness is greater than or equal to 1.5 mm, and the straightness is less than or equal to 1‰. The temperature measuring tube 4 is coated using a CVD alumina coating process, or it can be coated using a sol-gel mullite process or a composite coating (CVD underlayer + mullite surface layer). The high-density calibration tube + coated temperature measuring tube can effectively isolate harmful gases generated by the high temperature of the molten metal in the outer sheath 1. Thermocouple element 5 is one of type K, N, S, R, or B thermocouples, with a wire diameter ranging from 0.1mm to 1.2mm. The open end and wire tip of thermocouple element 5 are sealed and fixed with high-temperature insulating ceramic adhesive. In the event of an accidental breakage of the continuous temperature measuring device submerged in molten metal, the molten metal cannot overflow to the outside through the inner cavity of the quickly replaceable, assembled thermocouple, thus completely eliminating the risk of leakage. Thermocouple element 5 can continuously measure the temperature of the molten metal in the container.

[0044] Compared to the outer sheath 1, the calibration tube 2 has higher straightness and density. Higher straightness ensures a better fit between the replaceable assembly thermocouple and the inner cavity of the calibration tube 2. Higher density effectively prevents harmful gases such as silicon monoxide and carbon monoxide generated by the molten metal in the outer sheath 1 from penetrating the inner cavity of the outer protective layer, thus preventing the physicochemical damage of the temperature sensing tube 4 and thermocouple element 5 of the replaceable assembly thermocouple. The coating on the temperature sensing tube 4 further effectively prevents trace amounts of harmful gases such as carbon monoxide or nitrogen monoxide that permeate through the calibration tube 2 from causing physicochemical damage to the temperature sensing tube 4 and thermocouple element 5, thereby greatly extending the service life of the replaceable assembly thermocouple.

[0045] In this embodiment, the assembled thermocouple can be quickly assembled and disassembled with the outer protective body via the external connector 8. The external connector 8 is tightly fitted with the embedded threaded sleeve 7 inside the outer protective body via its external thread. The external connector 8 is embedded with the anti-leakage ring 6 via an interference fit. The inner diameter of the external connector 8, the inner diameter of the anti-leakage ring 6, and the outer diameter of the measuring tube 4 are consistent. The inner diameter of the outer protective body is slightly larger than the inner diameter of the temperature measuring tube 4, with a difference of less than 0.8 mm. The external connector 8 extends outward from the open end of the temperature measuring tube 4 and protrudes outward from the base side of the outer protective body, providing an electrical connection interface through which temperature measuring instruments and accessories can be quickly plugged in and out.

[0046] See Figure 3 and Figure 4 As shown, in an embodiment of the present invention, the end limiting mechanism includes a fixed flange 9, a clamping seat 10, and a wedge-shaped locking block 16. The fixed flange 9 is fixed to the mounting hole on the side wall or bottom of the container holding molten metal. The fixed flange 9 is provided with locking pins located on both sides of the mounting hole, and the locking pins are provided with locking pin holes. The clamping seat 10 is disposed on the outside of the fixed flange 9. The clamping seat 10 is provided with two through holes for the locking pins to pass through. The clamping seat 10 is locked by the wedge-shaped locking block 16 passing through the locking pin holes on the locking pins, thereby pressing the clamping seat 10 against the outer protective body.

[0047] In this embodiment, the sidewall of the molten metal container consists of, from the outside to the inside, a container wall 11, an insulation layer 12, a permanent layer 13, and a working layer 14. The inner wall of the permanent layer 13 is provided with a seat brick 15. During installation, the fixing flange 9 is welded to the predetermined mounting hole position on the sidewall or bottom of the molten metal container. The outer protective body needs to be pre-placed in the mounting hole on the sidewall or bottom of the molten metal container. The closed end of the outer protective body should be inserted perpendicularly to the wall surface, and the ratio of its insertion depth into the molten metal to its length should not be less than 1 / 3. Both the outer sheath 1 and the calibration tube 2 are open at one end and closed at the other end, with their openings facing the same direction. The gap between the outer protective body and the container wall 11, insulation layer 12, permanent layer 13, working layer 14, and seat brick 15 is filled with refractory mortar, so that the open end of the outer protective body slightly protrudes from the fixing flange 9. At this time, the pressure seat 10 is added and made to fit tightly against the fixing flange 9. Finally, the wedge-shaped locking block 16 is inserted and locked.

[0048] This invention provides a quick-change continuous temperature measuring device for measuring molten metal, the temperature measuring process of which is as follows:

[0049] First, insert the continuous temperature measuring device into the molten metal container according to the requirements and steps. The insertion depth should not be less than 1 / 3 of the total length of the temperature measuring device. The appropriate type of assembled thermocouple can be selected according to the specific process of the molten metal container.

[0050] Secondly, use the fixing flange 9, the clamping seat 10 and the wedge-shaped locking block 16 as required to firmly fix the outer protective body to the wall of the molten metal container.

[0051] Then, the temperature-related thermoelectric signal is output to the temperature measuring instrument through the external connector 8.

[0052] Furthermore, when the outer protective body's service life ends (i.e., one casting cycle), the assembled thermocouple used in this casting is removed and installed in the molten metal container with the pre-installed outer protective body to be used in the next casting, and the assembled thermocouple continues to be used.

[0053] Finally, just as the assembled thermocouple is about to reach the last casting of its theoretical service life, the assembled thermocouple is disassembled, the precious metal alloy is recycled, and the service life of the assembled thermocouple officially ends.

[0054] This invention provides a quick-replaceable continuous temperature measuring device for measuring molten metal. The service life of the outer protective body is the same as the maintenance cycle of the working layer of the molten metal container. The service life of the quick-replaceable assembly-type thermocouple is significantly longer than that of the outer protective body, and multiple working layer maintenance cycles can be applied. This invention features quick replacement, leak-proof safety, long component life, fast response speed, wide temperature measurement range, and low average cost.

[0055] The above description is merely an embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, extensions, etc., made within the spirit and principles of the present invention are included within the scope of protection of the present invention.

Claims

1. A quick-changeable continuous temperature measuring device for measuring molten metal, characterized in that, It includes an outer protective body and an assembled thermocouple. The outer protective body is fixedly installed in a mounting hole provided on the side wall or bottom of the molten metal container, and the closed end of the outer protective body is placed inside the molten metal container. The open end of the outer protective body is limited by an end limiting mechanism provided on the outer wall of the molten metal container. The assembled thermocouple is inserted into the outer protective body and is detachably connected to the outer protective body. The assembled thermocouple is used for continuous temperature measurement of the molten metal. The outer protective body includes an outer sheath (1), a calibration tube (2), a fast response head (3), and an embedded threaded sleeve (7). The outer sheath (1) is placed inside the molten metal container and has a fast response head (3) for improving the dynamic temperature measurement response speed. The inner wall of the outer sheath (1) is provided with a calibration tube (2) and an embedded threaded sleeve (7) located at the open end of the inner wall. One end of the calibration tube (2) is open and the other end is closed. The openings of the calibration tube (2) and the outer sheath (1) face the same direction. The calibration tube (2) is used to isolate harmful gases generated by the high temperature of the molten metal in the outer sheath (1). The embedded threaded sleeve (7) is used for quick connection with the assembled thermocouple. The outer sheath (1) is made of aluminum carbon, Mo-based metal ceramic or boron nitride. The calibration tube (2) is made of corundum, molybdenum disilicide or mullite; The assembled thermocouple includes a temperature measuring tube (4), a thermocouple element (5), a leak-proof ring (6), and an external connector (8). One end of the temperature measuring tube (4) is open, and the other end is closed. The thermocouple element (5) is placed inside the temperature measuring tube (4). The end of the thermocouple element (5) is provided with an external connector (8). The open end of the temperature measuring tube (4) is inserted into the external connector (8). The external connector (8) is secured to the temperature measuring tube (4) by the leak-proof ring (6). The external connector (8) is threadedly connected to the outer protective body. The temperature measuring tube (4) is made of corundum and has a reinforced coating on its surface.

2. The quick-changeable continuous temperature measuring device for measuring molten metal according to claim 1, characterized in that, The outer sheath (1) has a conical structure. The outer diameter of the open end of the outer sheath (1) is less than or equal to 75 mm, and the outer diameter of the closed end of the outer sheath (1) is greater than or equal to 55 mm. The inner cavity of the outer sheath (1) is a cylinder with an inner cavity diameter of 14-20 mm. The calibration tube (2) has an inner diameter of less than or equal to 10 mm and a thickness of greater than or equal to 2.2 mm.

3. The quick-change continuous temperature measuring device for measuring molten metal according to claim 1, characterized in that, The material of the fast response head (3) is a metal-ceramic composite material or a metal-based high-temperature alloy; the material of the embedded threaded sleeve (7) is high-strength stainless steel.

4. The quick-change continuous temperature measuring device for measuring molten metal according to claim 1, characterized in that, The outer protective body needs to be pre-placed in the mounting hole on the side wall or bottom of the molten metal container. The closed end of the outer protective body should be inserted perpendicularly to the wall of the molten metal container, and the ratio of the depth of insertion into the molten metal to the length of the outer protective body should be greater than or equal to 1 / 3.

5. The quick-change continuous temperature measuring device for measuring molten metal according to claim 1, characterized in that, The leak-proof ring (6) is made of a high-silicon aluminum-based alloy, which consists of 80%-87% aluminum, 10%-14% silicon, 0.5%-1.1% magnesium, and 0.1%-0.25% additives. Alternatively, the leak-proof ring (6) may be made of a fire-resistant sealing material that melts rapidly at temperatures above 550°C and then gelatinizes or expands several times over.

6. The quick-change continuous temperature measuring device for measuring molten metal according to claim 1, characterized in that, The inner diameter of the temperature measuring tube (4) is less than or equal to 5 mm, and the wall thickness is greater than or equal to 1.5 mm.

7. The quick-changeable continuous temperature measuring device for measuring molten metal according to claim 1, characterized in that, The end limiting mechanism includes a fixed flange (9), a clamping seat (10), and a wedge-shaped locking block (16). The fixed flange (9) is fixed to the mounting hole on the side wall or bottom of the container for the molten metal. The fixed flange (9) is provided with locking pins located on both sides of the mounting hole, and the locking pins are provided with locking pin holes. The clamping seat (10) is located on the outside of the fixed flange (9). The clamping seat (10) is provided with two through holes for the locking pins to pass through. The clamping seat (10) is locked by the wedge-shaped locking block (16) passing through the locking pin holes on the locking pins, thereby pressing the clamping seat (10) against the outer protective body.

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