A continuous temperature measuring probe structure for molten steel

Abstract

The utility model relates to metallurgical industry temperature measurement related technical field especially, relates to a kind of anti-oxidation molten steel continuous temperature measurement probe structure, including temperature measurement probe main part, the outer wall coaxial sleeve of temperature measurement probe main part is equipped with protective base, the surface of the protective base is fixedly connected with protection mechanism, the bottom surface of temperature measurement probe main part is provided with encapsulation mechanism.The anti-oxidation molten steel continuous temperature measurement probe structure, through the setting of protection mechanism, outer layer (ceramic layer), intermediate layer (alloy layer) and inner layer (graphite layer) are cooperated through material characteristics and structural design, form composite protection system, guarantee temperature measurement accuracy and equipment reliability, simultaneously, through the setting of encapsulation mechanism, protection base and temperature measurement probe main part can be quickly disassembled and assembled, simple and fast.

Description

Technical Field

[0001] This utility model relates to the technical field of temperature measurement in the metallurgical industry, and in particular to a structure of an anti-oxidation continuous temperature measurement probe for molten steel. Background Technology

[0002] Temperature measurement in the metallurgical industry is a technical system that monitors and controls the temperature throughout the entire process of metal smelting and processing to achieve process optimization, quality assurance, and equipment safety. It uses contact or non-contact methods to obtain real-time temperature information of molten metal, equipment surface, and internal components in processes such as ironmaking, steelmaking, continuous casting, and rolling. Therefore, there is a particular need for an oxidation-resistant continuous temperature measurement probe structure for molten steel.

[0003] However, in existing anti-oxidation continuous temperature measurement probes for molten steel, the protective sheath of traditional platinum-rhodium thermocouples is prone to oxidation and corrosion in molten steel at temperatures above 1600℃, leading to temperature signal drift or component breakage, with a typical lifespan of less than 8 hours. For example, in tundish temperature measurement, manual thermocouples need to be frequently inserted into the molten steel, exacerbating oxidation losses and maintenance costs. Utility Model Content

[0004] The purpose of this invention is to provide an anti-oxidation continuous temperature measurement probe structure for molten steel, addressing the shortcomings of existing anti-oxidation continuous temperature measurement probe structures mentioned in the background section. In use, the protective sheath of traditional platinum-rhodium thermocouples is prone to oxidation and corrosion in molten steel at temperatures above 1600℃, leading to temperature signal drift or component breakage, with a typical lifespan of less than 8 hours.13 For example, in tundish temperature measurement, manual thermocouples require frequent insertion into the molten steel, exacerbating oxidation loss and maintenance costs.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an anti-oxidation type continuous temperature measuring probe structure for molten steel, comprising a temperature measuring probe body, a protective base coaxially sleeved on the outer wall of the temperature measuring probe body, a protective mechanism fixedly connected to the surface of the protective base, and an encapsulation mechanism provided on the bottom surface of the temperature measuring probe body;

[0006] The protective mechanism includes an outer layer, a middle layer, and an inner layer. The outer layer is a gradient ceramic layer, the middle layer is an alloy layer, and the inner layer is a graphite layer.

[0007] Preferably, the outer layer is an Al2O3-ZrO2 composite sintered body, wherein the ZrO2 content decreases gradually from the outside to the inside (60wt% on the outside and 30wt% on the inside), the porosity is 3% to 5%, and the pore size is 50μm to 200μm.

[0008] Preferably, the inner wall of the intermediate layer is coated with a nano-Al2O3 coating (oxygen permeability <1×10⁻¹³cm² / s).

[0009] Preferably, the gap between the inner layer and the thermocouple is filled with a yttrium oxide fiber insulation layer with a density of 0.8 g / cm³ to 1.2 g / cm³.

[0010] Preferably, the packaging mechanism includes a limiting groove, a threaded groove is formed on the bottom surface of the temperature probe body, a first sealing groove is formed on one side of the bottom surface of the temperature probe body, a limiting block is fixedly connected to the surface of the protective base, a limiting hole is formed on the surface of the protective base corresponding to the position of the threaded groove, a second sealing groove is formed on the ground of the protective base corresponding to the position of the first sealing groove, a sealing ring is provided between the first sealing groove and the second sealing groove, and a fixing bolt passes through the inside of the limiting hole.

[0011] Preferably, the limiting block and the limiting groove are matched in size to ensure a stable connection between the protective base and the temperature probe body.

[0012] Preferably, the sealing ring is made of a high-temperature resistant and oxidation-resistant material to ensure sealing performance, and the fixing bolt is made of stainless steel to enhance its corrosion resistance and strength.

[0013] Compared with the prior art, the beneficial effects of this utility model are: the structure of this anti-oxidation molten steel continuous temperature measuring probe, through the setting of the protective mechanism, the outer layer (ceramic layer), the middle layer (alloy layer) and the inner layer (graphite layer) form a composite protection system through the synergistic cooperation of material properties and structural design, which ensures the temperature measurement accuracy and equipment reliability. At the same time, through the setting of the packaging mechanism, the protective base and the temperature measuring probe body can be quickly disassembled and assembled, which is simple and fast. Attached Figure Description

[0014] Figure 1 This is a side view of the appearance structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the testing mechanism of this utility model;

[0016] Figure 3 This is a schematic diagram of the storage mechanism structure of this utility model;

[0017] Figure 4 This utility model Figure 2 Enlarged structural diagram at point A in the middle.

[0018] In the diagram: 1. Temperature probe body; 2. Protective base; 3. Protective mechanism; 301. Outer layer; 302. Middle layer; 303. Inner layer; 4. Encapsulation mechanism; 401. Limiting groove; 402. Threaded groove; 403. First sealing groove; 404. Limiting block; 405. Limiting hole; 406. Second sealing groove; 407. Sealing ring; 408. Fixing bolt. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1-4 This utility model provides a technical solution: an anti-oxidation type continuous temperature measuring probe structure for molten steel, including a temperature measuring probe body 1, a protective base 2 coaxially sleeved on the outer wall of the temperature measuring probe body 1, a protective mechanism 3 fixedly connected to the surface of the protective base 2, and an encapsulation mechanism 4 provided on the bottom surface of the temperature measuring probe body 1.

[0021] The protective mechanism 3 includes an outer layer 301, a middle layer 302, and an inner layer 303. The outer layer 301 is a gradient ceramic layer, the middle layer 302 is an alloy layer, and the inner layer 303 is a graphite layer. Through the arrangement of the outer layer 301, the middle layer 302, and the inner layer 303, during use, because the outer layer 301 is a gradient ceramic layer (Al2O3-ZrO2 composite sintered body), the gradient ceramic layer (60wt% on the outer side and 30wt% on the inner side) effectively alleviates thermal stress concentration caused by sudden temperature changes, reducing the risk of cracking. The high melting point of the ceramic material (e.g., Al2O3 melting point 20°C) also contributes to this effect. The ZrO2 layer (54℃) can resist corrosion from high-temperature molten steel (typically ≥1500℃). Simultaneously, the chemical inertness of ZrO2 inhibits the penetration corrosion of oxides (such as FeO and MnO) in the molten steel. The outer 301 layer has a porosity controlled at 3%–5% and a pore size of 50μm–200μm, possessing both density and toughness, capable of withstanding the scouring force of molten steel flow and external mechanical impact. The middle 302 layer provides structural rigidity through a high-strength alloy material (such as a nickel-based high-temperature alloy), resisting the scouring of molten steel flow and external mechanical impact, preventing thermocouple signal distortion due to probe deformation. A nano-Al2O3 coating is sprayed onto the surface of the alloy layers. (Oxygen permeability < 1 × 10⁻¹³ cm² / s) can block the penetration and erosion of oxidizing substances such as FeO and MnO in molten steel slag, extending the probe's service life. The alloy layer, as a conductive medium, optimizes the electrical connection stability between the temperature probe body 1 and the packaging mechanism 4, reducing the interference of contact resistance on the thermocouple signal (μV level). The low thermal conductivity (approximately 50 W / m·K—150 W / m·K) of the inner 303 (graphite layer) can slow down the rate of heat transfer to the internal temperature sensing element, preventing signal drift or damage to the thermocouple due to instantaneous high-temperature shocks. The high-temperature strength (compressive strength) of the graphite material... (≥20MPa) can absorb mechanical vibrations caused by the flow of molten steel, preventing the thermocouple from breaking or shifting due to external forces. It works synergistically with the nano-Al2O3 coating of the intermediate layer 302 to block the chemical corrosion of the internal temperature measuring element by molten steel slag (such as alkaline components like CaO and MnO), extending the service life of the probe in alkaline slag environments. In the anti-oxidation continuous temperature measuring probe for molten steel, the outer layer 301 (ceramic layer), the intermediate layer 302 (alloy layer), and the inner layer 303 (graphite layer) form a composite protection system through the synergistic cooperation of material properties and structural design, ensuring temperature measurement accuracy and equipment reliability.

[0022] Furthermore, the outer layer 301 is an Al2O3-ZrO2 composite sintered body, wherein the ZrO2 content decreases gradually from the outside to the inside (60wt% on the outside and 30wt% on the inside), the porosity is 3% to 5%, and the pore size is 50μm to 200μm.

[0023] Furthermore, the inner wall of the intermediate layer 302 is sprayed with a nano Al2O3 coating (oxygen permeability <1×10⁻¹³cm² / s).

[0024] Furthermore, the gap between the inner 303 layer and the thermocouple is filled with a yttrium oxide fiber insulation layer with a density of 0.8 g / cm³ to 1.2 g / cm³.

[0025] Furthermore, the encapsulation mechanism 4 includes a limiting groove 401, a threaded groove 402 on the bottom surface of the temperature probe body 1, a first sealing groove 403 on one side of the bottom surface of the temperature probe body 1, a limiting block 404 fixedly connected to the surface of the protective base 2, a limiting hole 405 corresponding to the position of the threaded groove 402 on the surface of the protective base 2, a second sealing groove 406 corresponding to the position of the first sealing groove 403 on the ground of the protective base 2, a sealing ring 407 provided between the first sealing groove 403 and the second sealing groove 406, and a fixing bolt 408 passing through the interior of the limiting hole 405. The system utilizes the limiting groove 401, threaded groove 402, first sealing groove 403, limiting block 404, limiting hole 405, and second sealing groove... The sealing ring 406, sealing ring 407, and fixing bolt 408 are configured as follows: During use, when it is necessary to fix the protective mechanism 3, firstly, place the sealing ring 407 inside the first sealing groove 403. Then, align the protective base 2 with the temperature probe body 1, and simultaneously fit the limiting block 404 inside the limiting groove 401, ensuring that the limiting hole 405 and the threaded groove 402 are aligned. At this time, one end of the fixing bolt 408 can be passed through the limiting hole 405 and then threadedly connected to the temperature probe body 1 through the threaded groove 402. Tighten the fixing bolt 408. At this time, the fixing bolt 408 connects the protective base 2 with the temperature probe body 1, and the sealing ring 407 is set between the first sealing groove 403 and the second sealing groove 406 for sealing.

[0026] Furthermore, the size of the limiting block 404 matches that of the limiting groove 401 to ensure a stable connection between the protective base 2 and the temperature probe body 1. With the setting of the limiting block 404, when the limiting block 404 is fully fitted inside the limiting groove 401 during use, the connection between the protective base 2 and the temperature probe body 1 can be more stable.

[0027] Furthermore, the sealing ring 407 is made of a high-temperature resistant and oxidation-resistant material to ensure sealing performance, and the fixing bolt 408 is made of stainless steel to enhance its corrosion resistance and strength. With the setting of the sealing ring 407, molten steel is prevented from seeping into the probe during use, which could cause the thermocouple to short circuit or the signal to be distorted.

[0028] Working principle: First, place the sealing ring 407 inside the first sealing groove 403. Then, align the protective base 2 with the temperature probe body 1, and simultaneously fit the limiting block 404 into the limiting groove 401, ensuring that the limiting hole 405 and the threaded groove 402 are aligned. At this point, one end of the fixing bolt 408 can be passed through the limiting hole 405 and then threadedly connected to the temperature probe body 1 through the threaded groove 402. Tighten the fixing bolt 408, which connects the protective base 2 to the temperature probe body 1. Simultaneously, the sealing ring 407 is positioned between the first sealing groove 403 and the second sealing groove 406 for sealing. The outer layer 301 is a gradient ceramic layer (Al2O3). The 3-ZrO2 composite sintered body, through a composition gradient decreasing design (60wt% on the outer side and 30wt% on the inner side), effectively alleviates thermal stress concentration caused by sudden temperature changes, reducing the risk of cracking. The high melting point of ceramic materials (such as Al2O3 with a melting point of 2054℃) can resist the corrosion of molten steel at high temperatures (typically ≥1500℃). At the same time, the chemical inertness of ZrO2 can inhibit the penetration corrosion of oxides (such as FeO and MnO) in molten steel. The outer 301 layer has a porosity controlled at 3% to 5% and a pore size of 50μm to 200μm, combining density and toughness, and can withstand the scouring force of molten steel flow and external mechanical impact. The middle 302 layer is made of high-strength alloy material (such as nickel-based high-temperature alloy) to provide... The structure is rigid, resisting the erosion of molten steel flow and external mechanical impact, preventing thermocouple signal distortion due to probe deformation. The nano-Al2O3 coating (oxygen permeability <1×10⁻¹³cm² / s) sprayed on the alloy layer surface can block the penetration and erosion of oxidizing substances such as FeO and MnO in molten steel slag, extending the probe's service life. The alloy layer, as a conductive medium, optimizes the electrical connection stability between the temperature probe body 1 and the packaging mechanism 4, reducing the interference of contact resistance on the thermocouple signal (μV level). The low thermal conductivity (approximately 50W / m·K—150W / m·K) of the inner 303 (graphite layer) slows down the rate of heat transfer to the internal temperature sensing element, preventing thermocouple distortion due to instantaneous changes. High-temperature shocks can cause signal drift or damage. The high-temperature strength (compressive strength ≥20MPa) of graphite material can absorb the mechanical vibration caused by the flow of molten steel, preventing the thermocouple from breaking or shifting due to external forces. In synergy with the nano-Al2O3 coating of the intermediate layer 302, it blocks the chemical corrosion of the internal temperature measuring element by molten steel slag (such as alkaline components such as CaO and MnO), extending the service life of the probe in alkaline slag environment. In the anti-oxidation continuous temperature measuring probe of molten steel, the outer layer 301 (ceramic layer), the intermediate layer 302 (alloy layer), and the inner layer 303 (graphite layer) form a composite protection system through the synergistic cooperation of material properties and structural design, ensuring temperature measurement accuracy and equipment reliability.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A continuous temperature measurement probe structure for molten steel, comprising a temperature measurement probe body (1), characterized in that: The outer wall of the temperature probe body (1) is coaxially fitted with a protective base (2), and a protective mechanism (3) is fixedly connected to the surface of the protective base (2). A sealing mechanism (4) is provided on the bottom surface of the temperature probe body (1). The protective mechanism (3) includes an outer layer (301), a middle layer (302) and an inner layer (303). The outer layer (301) is a gradient ceramic layer, the middle layer (302) is an alloy layer, and the inner layer (303) is a graphite layer.

2. The continuous temperature measuring probe for molten steel according to claim 1, characterized in that: The outer layer (301) is an Al2O3-ZrO2 composite sintered body, wherein the ZrO2 content decreases gradually from the outside to the inside, the porosity is 3% to 5%, and the pore size is 50μm-200μm.

3. The continuous temperature measuring probe for molten steel according to claim 1, characterized in that: The inner wall of the intermediate layer (302) is coated with a nano-Al2O3 coating.

4. The structure of the anti-oxidation continuous temperature measuring probe for molten steel according to claim 1, characterized in that: The gap between the inner layer (303) and the thermocouple is filled with yttrium oxide fiber insulation layer with a density of 0.8 g / cm³ to 1.2 g / cm³.

5. The structure of the anti-oxidation continuous temperature measurement probe for molten steel according to claim 1, characterized in that: The encapsulation mechanism (4) includes a limiting groove (401), a threaded groove (402) is provided on the bottom surface of the temperature probe body (1), a first sealing groove (403) is provided on one side of the bottom surface of the temperature probe body (1), a limiting block (404) is fixedly connected to the surface of the protective base (2), a limiting hole (405) is provided on the surface of the protective base (2) corresponding to the position of the threaded groove (402), a second sealing groove (406) is provided on the ground of the protective base (2) corresponding to the position of the first sealing groove (403), a sealing ring (407) is provided between the first sealing groove (403) and the second sealing groove (406), and a fixing bolt (408) passes through the inside of the limiting hole (405).

6. The structure of the anti-oxidation continuous temperature measurement probe for molten steel according to claim 5, characterized in that: The limiting block (404) and the limiting groove (401) are matched in size to ensure a stable connection between the protective base (2) and the temperature probe body (1).

7. The structure of the anti-oxidation continuous temperature measurement probe for molten steel according to claim 5, characterized in that: The sealing ring (407) is made of a high-temperature resistant and oxidation-resistant material to ensure sealing performance, and the fixing bolt (408) is made of stainless steel to enhance its corrosion resistance and strength.

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