Quartz tube platinum rhodium thermocouple for molten iron temperature measurement
By introducing a protective structure into the molten iron temperature measuring thermocouple, the problems of molten iron contamination and temperature measurement inaccuracy caused by the melting of the aluminum cap are solved, and stable and accurate molten iron temperature measurement and resource conservation are achieved.
Patent Information
- Application Number
- CN202423037309.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-10
- Publication Date
- 2025-10-03
- Estimated Expiration
- 2034-12-10
AI Technical Summary
During use, the aluminum cap of the existing molten iron temperature measuring thermocouple melts, causing molten iron contamination and affecting temperature measurement accuracy, and the structure is unstable.
It uses a quartz tube platinum-rhodium thermocouple equipped with a protective structure, including an insulation ring, a sealing ring, a moving ring and a slag shield. It is made of high-temperature resistant materials to prevent the aluminum cap from melting, ensuring temperature stability and temperature measurement accuracy.
It avoids molten iron pollution, keeps temperature stable, improves temperature measurement accuracy, and is reusable, saving resources.
Smart Images
Figure CN223412833U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of molten iron temperature measurement, in particular to a quartz tube platinum-rhodium thermocouple for molten iron temperature measurement. Background Art
[0002] Molten iron temperature is a crucial parameter in the current steelmaking process. It significantly impacts the smooth operation of the continuous casting process, reduces raw material and energy consumption, and improves ingot quality. Temperature control is a barometer of the smooth operation of a steelmaking plant's systems, so measuring molten iron temperature is crucial.
[0003] In the prior art, the structure of a disposable thermocouple for measuring the temperature of molten iron usually includes a quartz tube, an aluminum cap, a platinum-platinum-rhodium wire, refractory cement, a refractory mud head, copper wire, copper-nickel wire, an outer paper tube and a plastic fixed connector. The outermost part is equipped with a slag-proof aluminum cap. All components are concentrated in the refractory mud head and filled and bonded into a whole with refractory cement. When in use, the thermocouple is installed on a special tool and quickly inserted into the molten steel. According to the thermoelectric efficiency of the metal, the temperature difference generated at both ends of the thermocouple is used to electrothermally measure the temperature of the molten iron and high-molten metal. It is a disposable consumable thermocouple. When this type of thermocouple is in use, the aluminum cap is used to protect the quartz tube. However, the aluminum cap will melt during the process of being inserted into the molten iron, causing pollution to the molten iron. Moreover, when the aluminum cap melts, the temperature around the thermocouple will change, affecting the accuracy of the molten iron temperature measurement. Based on this, the present application proposes a quartz tube platinum-rhodium thermocouple for molten iron temperature measurement. Utility Model Content
[0004] The utility model provides a quartz tube platinum-rhodium thermocouple for measuring the temperature of molten iron, which solves the problem proposed in the above background technology that the thermocouple adopts a slag-proof aluminum cap, the aluminum cap will melt when inserted into the molten iron, causing pollution to the molten iron, and when the aluminum cap melts, the temperature around the thermocouple will change, affecting the accuracy of the molten iron temperature measurement.
[0005] The utility model provides the following technical solution: a quartz tube platinum-rhodium thermocouple for measuring the temperature of molten iron, comprising a thermocouple body and a protective structure, the protective structure comprising a power unit and a slag protection cover, the power unit comprising a thermal insulation ring fixedly connected to the thermocouple body, the outer ring of the thermal insulation ring being fixedly connected to a sealing ring, the thermal insulation ring and the sealing ring forming a sealed cavity, the outer ring of the thermal insulation ring being movably sleeved with a movable ring, a filler being filled between the top of the movable ring and the top of the inner cavity of the sealed cavity, the filler being vaporized by heat, the bottom of the movable ring being evenly fixedly connected to a guide rod, the other end of the guide rod being movably connected to the bottom of the thermal insulation ring;
[0006] The slag-proof cover is adapted to the bottom end of the thermocouple body, the outer ring of the top end of the slag-proof cover is fixedly connected to a connecting ring, the connecting ring is connected to the guide rod by bolts, the connecting ring is clamped to the bottom of the insulation ring, and a through hole is provided in the middle of the bottom of the inner cavity of the slag-proof cover, and the bottom of the through hole is connected to a sealing plate through a spring.
[0007] Preferably, the bottom of the thermal insulation ring is evenly provided with guide grooves, the guide rod is movably connected to the inner cavity of the guide groove, and the bottom of the thermal insulation ring is evenly provided with clamping grooves.
[0008] Preferably, a clamping block is evenly fixedly connected to the top of the connecting ring, and the clamping block is adapted to the clamping slot; and a through hole is evenly provided on the top of the slag-proof cover.
[0009] Preferably, a threaded hole adapted for a bolt is provided in the middle of the bottom of the guide rod, and the bolt is threadedly connected to the connecting ring.
[0010] Preferably, the inner diameter of the movable ring is adapted to the outer diameter of the top end of the heat-insulating ring, the outer diameter of the movable ring is adapted to the inner diameter of the sealing ring, and the outer surface of the movable ring is wrapped with a sealing tape.
[0011] Preferably, spring grooves are evenly provided at the bottom of the through hole, the spring is fixedly connected to the top of the inner cavity of the spring groove, and the other end of the spring is fixedly connected to the bottom of the blocking plate.
[0012] Preferably, the thermocouple body includes a refractory mud head, an outer paper tube, a plastic fixed connector, copper wire, a quartz tube, a platinum-rhodium wire and a copper-nickel wire. The bottom end of the outer paper tube is connected to the top of the inner cavity of the refractory mud head, the plastic fixed connector is clamped in the inner cavity of the outer paper tube, and copper wire and copper-nickel wire are fixed on both sides of the inner cavity of the plastic fixed connector. The bottom end of the plastic fixed connector is clamped with a quartz tube, and a platinum-rhodium wire is provided inside the quartz tube. One end of the platinum-rhodium wire is connected to the copper wire, and the other end of the platinum-rhodium wire is connected to the copper-nickel wire. The inner cavity of the refractory mud head is filled with refractory mud, the top of the quartz tube and the bottom end of the plastic fixed connector are both wrapped by refractory mud, the bottom end of the quartz tube is located outside the refractory mud head, the thermal insulation ring is fixedly connected to the refractory mud head, and the slag shield is adapted to the quartz tube.
[0013] Compared with the prior art, the present invention has the following beneficial effects:
[0014] 1. The quartz tube platinum-rhodium thermocouple used for molten iron temperature measurement uses a protective structure to protect the quartz tube, and the protective structure is made of high-temperature resistant material, so that it will not melt during use, avoiding contamination of the molten iron and keeping the temperature around the thermocouple stable, which is conducive to detecting the molten iron temperature. It is reusable and saves resources.
[0015] 2. The quartz tube platinum-rhodium thermocouple used for measuring the temperature of the molten iron can protect the quartz tube through the setting of the protective structure to prevent the thermocouple from contacting the molten iron during the insertion process. During the insertion of the thermocouple, the filler can be vaporized by heat, and the vaporized filler can squeeze the movable ring. The movable ring drives the slag shield to move through the guide rod until the through hole on the slag shield is exposed to the outside of the thermocouple body. At this time, the thermocouple moves to the target position, and the molten iron around the thermocouple enters the slag shield through the through hole. The thermocouple can detect the molten iron at the target position, thereby improving the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a front view of the structure of the utility model;
[0017] Figure 2 For the utility model structure Figure 1 Bottom schematic diagram;
[0018] Figure 3 For the utility model structure Figure 1 Schematic cross-section;
[0019] Figure 4 This is a schematic diagram of the explosion of the structural protection structure of the utility model;
[0020] Figure 5 This is a schematic diagram of the explosion-proof slag cover structure of the utility model;
[0021] Figure 6 This is a schematic diagram of the explosion of the thermocouple body of the utility model structure.
[0022] In the figure: 1. Thermocouple body; 2. Sealing ring; 3. Slag shield; 4. Sealing plate; 5. Connecting ring; 6. Guide rod; 7. Bolt; 8. Filler; 9. Moving ring; 10. Insulating ring; 11. Slot; 12. Guide groove; 13. Spring; 14. Block; 15. Refractory mud head; 16. Outer paper tube; 17. Plastic fixed connector; 18. Copper wire; 19. Quartz tube; 20. Platinum-rhodium wire; 21. Copper-nickel wire. DETAILED DESCRIPTION
[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0024] The utility model provides a quartz tube platinum-rhodium thermocouple for measuring the temperature of molten iron, comprising a thermocouple body 1 and a protective structure, wherein the thermocouple body 1 comprises a refractory mud head 15, an outer paper tube 16, a plastic fixed connector 17, a copper wire 18, a quartz tube 19, a platinum-rhodium wire 20 and a copper-nickel wire 21, wherein the bottom end of the outer paper tube 16 is connected to the top end of the inner cavity of the refractory mud head 15, the plastic fixed connector 17 is clamped in the inner cavity of the outer paper tube 16, and the two ends of the inner cavity of the plastic fixed connector 17 are connected. A copper wire 18 and a copper-nickel wire 21 are fixed on both sides, a quartz tube 19 is clamped on the bottom end of the plastic fixed connector 17, a platinum-rhodium wire 20 is provided inside the quartz tube 19, one end of the platinum-rhodium wire 20 is connected to the copper wire 18, and the other end of the platinum-rhodium wire 20 is connected to the copper-nickel wire 21, the inner cavity of the refractory mud head 15 is filled with refractory mud, the top end of the quartz tube 19 and the bottom end of the plastic fixed connector 17 are both wrapped in refractory mud, and the bottom end of the quartz tube 19 is located outside the refractory mud head 15.
[0025] The protective structure includes a power part and a slag protection cover 3. The power part includes an insulating ring 10 fixedly connected to the thermocouple body 1. The insulating ring 10 is fixedly connected to the refractory mud head 15. The material of the insulating ring 10 can be high-temperature ceramic fiber. Through the setting of the insulating ring 10, the influence of the molten iron temperature on the refractory mud head 15 can be reduced, which facilitates the use of the thermocouple.
[0026] The outer ring of the insulation ring 10 is fixedly connected to the sealing ring 2, and the insulation ring 10 and the sealing ring 2 form a sealed cavity. The material of the sealing ring 2 has thermal conductivity, which facilitates the transfer of the molten iron temperature to the inside of the sealed cavity. The material of the sealing ring 2 can be heat-resistant stainless steel with a melting point above 2000 degrees.
[0027] The outer ring of the insulation ring 10 is movably connected to the movable ring 9, and the top of the movable ring 9 and the top of the inner cavity of the sealed cavity are filled with a filler 8. The filler 8 vaporizes when heated. The filler 8 can be water. Through the setting of the filler 8, when the thermocouple is in use, in a high temperature environment, the filler 8 can vaporize and its volume increases, and the filler 8 will push the movable ring 9 to move.
[0028] The bottom of the movable ring 9 is evenly fixedly connected with a guide rod 6, and the bottom of the insulation ring 10 is evenly provided with a guide groove 12. The guide rod 6 is movably connected to the inner cavity of the guide groove 12. Through the setting of the guide groove 12, the movable ring 9 can drive the guide rod 6 to move when it moves, and the end of the guide rod 6 away from the movable ring 9 can extend to the outside of the power unit.
[0029] The inner diameter of the movable ring 9 is adapted to the outer diameter of the top end of the thermal insulation ring 10, and the outer diameter of the movable ring 9 is adapted to the inner diameter of the sealing ring 2. The outer surface of the movable ring 9 is wrapped with a sealing tape. By setting the sealing tape, the sealing between the movable ring 9 and the sealing ring 2 or the thermal insulation ring 10 can be increased to ensure the use effect of the power unit. The material of the sealing tape can be aluminum carbonate wool with an operating temperature of 1500-1700°C.
[0030] The slag shield 3 is adapted to the bottom end of the thermocouple body 1, and the outer ring of the top of the slag shield 3 is fixedly connected to the connecting ring 5, and the bottom of the thermal insulation ring 10 is evenly provided with a card groove 11, and the top of the connecting ring 5 is evenly fixedly connected with a card block 14, and the card block 14 is adapted to the card groove 11; the middle part of the bottom of the guide rod 6 is provided with a threaded hole adapted to the bolt 7, and the bolt 7 is threadedly connected to the connecting ring 5; through the setting of the connecting ring 5 and the thermal insulation ring 10, the connecting ring 5 and the thermal insulation ring 10 can be connected together, so that the slag shield 3 can protect the quartz tube 19 during the transfer process of the thermocouple, and the quartz tube 19 can be protected by the bolt 7. The setting is that the connecting ring 5 is connected to the guide rod 6. When the guide rod 6 moves, it can push the connecting ring 5 downward. Under the action of this thrust, the block 14 and the slot 11 can be separated, so that when the thermocouple is in use, the slag cover 3 can be quickly opened, which is convenient for the thermocouple to measure the temperature of the molten iron, and the top of the slag cover 3 is evenly provided with through holes. When the slag cover 3 is in the open state, the top of the slag cover 3 is located at the bottom end of the inner cavity of the refractory mud head 15, and the external molten iron can enter the inside of the slag cover 3 through the through hole, so that the thermocouple can measure the temperature of the molten iron.
[0031] A through hole is provided in the middle of the bottom of the inner cavity of the slag-proof cover 3, and the bottom of the through hole is connected to the sealing plate 4 through a spring 13. Spring grooves are evenly provided at the bottom of the through hole, and the spring 13 is fixedly connected to the top of the inner cavity of the spring groove. The other end of the spring 13 is fixedly connected to the bottom of the sealing plate 4. Through the setting of the sealing plate 4, the excess molten iron in the slag-proof cover 3 can be discharged, reducing the waste of molten iron.
[0032] The above-mentioned protective structure is made of high-temperature resistant materials. The various structures of the protective plate will not melt in the molten iron, which can prevent the molten iron from being contaminated during temperature measurement. The slag cover 3, sealing ring 2, connecting ring 5, sealing plate 4, spring 13, guide rod 6 and bolt 7 can all be made of tungsten-based alloy, and the above-mentioned protective structure can be reused to save resources.
[0033] To sum up: when the quartz tube platinum-rhodium thermocouple for measuring the temperature of molten iron is used, the thermocouple is installed on a special tool for measuring the temperature of molten iron, such as a temperature gun. The thermocouple is quickly inserted into the molten iron using the temperature gun. During the insertion of the thermocouple, the filler 8 is heated and vaporized, and the volume of the vaporized filler 8 increases, squeezing the movable ring 9. The movable ring 9 drives the slag cover 3 downward through the guide rod 6 fixedly connected to it until the through hole on the slag cover 3 is exposed to the outside of the thermocouple body 1. The molten iron around the thermocouple enters the slag cover 3 through the through hole, and the molten iron contacts the quartz tube 19. The thermocouple body uses the temperature difference generated at both ends of the thermocouple to electrically measure the temperature of the molten iron based on the thermoelectric efficiency of the metal. During the lifting process of the thermocouple, the excess molten iron in the slag cover 3 can squeeze the sealing plate 4 under the action of gravity, so that the through hole is in an open state, and the excess molten iron is discharged through the through hole to reduce waste.
[0034] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt conventional models in the existing technology and will not be described in detail here. The content not described in detail in this specification belongs to the existing technology known to professional and technical personnel in this field. Although the embodiments of the present invention have been shown and described, it can be understood by ordinary technicians in this field that various changes, modifications, substitutions and modifications can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.
Claims
1. A quartz tube platinum-rhodium thermocouple for measuring molten iron temperature, comprising a thermocouple body (1) and a protective structure, characterized in that: The protective structure includes a power unit and a slag protection cover (3), the power unit includes a heat-insulating ring (10) fixedly connected to the thermocouple body (1), the outer ring of the heat-insulating ring (10) is fixedly connected to a sealing ring (2), the heat-insulating ring (10) and the sealing ring (2) form a sealed cavity, the outer ring of the heat-insulating ring is movably sleeved with a moving ring (9), a filler (8) is filled between the top of the moving ring (9) and the top of the inner cavity of the sealed cavity, the filler (8) is vaporized by heat, the bottom of the moving ring (9) is evenly fixedly connected to a guide rod (6), and the other end of the guide rod (6) is movably connected to the bottom of the heat-insulating ring (10); The slag shield (3) is adapted to the bottom end of the thermocouple body (1); the outer ring of the top end of the slag shield (3) is fixedly connected to a connecting ring (5); the connecting ring (5) is connected to the guide rod (6) by a bolt (7); the connecting ring (5) is clamped to the bottom of the thermal insulation ring (10); a through hole is provided in the middle of the bottom of the inner cavity of the slag shield (3); the bottom of the through hole is connected to a sealing plate (4) via a spring (13).
2. A quartz tube platinum-rhodium thermocouple for molten iron temperature measurement according to claim 1, characterized in that: The bottom of the heat-insulating ring (10) is evenly provided with guide grooves (12), the guide rod (6) is movably connected to the inner cavity of the guide groove (12), and the bottom of the heat-insulating ring (10) is evenly provided with clamping grooves (11).
3. A quartz tube platinum-rhodium thermocouple for molten iron temperature measurement according to claim 2, characterized in that: The top of the connecting ring (5) is evenly fixedly connected with a clamping block (14), and the clamping block (14) is adapted to the clamping slot (11); and the top of the slag-proof cover (3) is evenly provided with through holes.
4. A quartz tube platinum-rhodium thermocouple for measuring molten iron temperature according to claim 1, characterized in that: A threaded hole adapted to the bolt (7) is provided in the middle of the bottom of the guide rod (6), and the bolt (7) is threadedly connected to the connecting ring (5).
5. The quartz tube platinum-rhodium thermocouple for measuring molten iron temperature according to claim 1, characterized in that: The inner diameter of the movable ring (9) is adapted to the outer diameter of the top end of the heat-insulating ring (10), the outer diameter of the movable ring (9) is adapted to the inner diameter of the sealing ring (2), and the outer surface of the movable ring (9) is wrapped with a sealing tape.
6. A quartz tube platinum-rhodium thermocouple for measuring molten iron temperature according to claim 1, characterized in that: The bottom of the through hole is evenly provided with a spring groove, the spring (13) is fixedly connected to the top of the spring groove inner cavity, and the other end of the spring (13) is fixedly connected to the bottom of the blocking plate (4).
7. A quartz tube platinum-rhodium thermocouple for measuring molten iron temperature according to claim 1, characterized in that: The thermocouple body (1) comprises a refractory mud head (15), an outer paper tube (16), a plastic fixed connector (17), a copper wire (18), a quartz tube (19), a platinum-rhodium wire (20) and a copper-nickel wire (21), the bottom end of the outer paper tube (16) is connected to the top end of the inner cavity of the refractory mud head (15), the plastic fixed connector (17) is clamped in the inner cavity of the outer paper tube (16), the copper wire (18) and the copper-nickel wire (21) are fixed on both sides of the inner cavity of the plastic fixed connector (17), the bottom end of the plastic fixed connector (17) is clamped with the quartz tube (1 9), a platinum-rhodium wire (20) is provided inside the quartz tube (19), one end of the platinum-rhodium wire (20) is connected to the copper wire (18), and the other end of the platinum-rhodium wire (20) is connected to the copper-nickel wire (21), the inner cavity of the refractory mud head (15) is filled with refractory mud, the top end of the quartz tube (19) and the bottom end of the plastic fixed connector (17) are both wrapped with refractory mud, the bottom end of the quartz tube (19) is located outside the refractory mud head (15), the insulation ring (10) is fixedly connected to the refractory mud head (15), and the slag shield (3) is adapted to the quartz tube (19).