Anti-interference converter molten steel temperature detection device

Abstract

The utility model discloses a converter molten steel temperature detection device of anti -interference applies in molten steel temperature detection equipment technical field, including support rod, the utility model discloses a heat conduction seat is installed in the temperature measuring installation sleeve, and the heat conduction seat is installed with positive and negative electrode thermocouple inside, and the surface of temperature measuring installation sleeve is designed with the protective sleeve, can make this thermocouple probe insert into the molten steel, and the temperature is given heat conduction seat through the protective sleeve, and then is given positive and negative electrode thermocouple through heat conduction seat, and the protective sleeve protects heat conduction cover and positive and negative electrode thermocouple in temperature measuring installation sleeve, when damage appears, only need to replace the protective sleeve, do not need to replace positive and negative electrode thermocouple and heat conduction cover, reduce the use of cost, and the material quality of protective sleeve and heat conduction seat are all silicon nitride combines silicon carbide, have very high thermal conductivity, and the ability of resisting molten steel scouring is strong, and the chemical stability is excellent, does not react with molten steel, slag, avoids the pollution molten steel.

Description

Technical Field

[0001] This utility model belongs to the technical field of molten steel temperature detection equipment, and specifically relates to an interference-resistant converter molten steel temperature detection device. Background Technology

[0002] Fast thermocouples are specifically designed for measuring the temperature of molten steel and high-temperature molten metals, and are widely used in metallurgical processes such as steelmaking, ironmaking, and electric furnaces. Their working principle is based on the thermoelectric effect of metals, achieving rapid temperature measurement through the thermoelectric electromotive force generated by the temperature difference between the two ends of the thermocouple. The response time is typically less than 5 seconds. Currently, traditional fast thermocouples are disposable temperature sensors. A fast thermocouple mainly consists of a thermocouple head and a large paper tube. The thermocouple head has positive and negative thermocouple wires welded to compensating wires, which are embedded in a support. The support is covered by a small paper tube, and the thermocouple wires are supported and protected by quartz. An anti-slag cap is installed on the outermost layer. All components are concentrated in a clay head and bonded together with refractory filler. This structure makes it non-removable and cannot be disassembled after use. For repair and reuse, fast thermocouples are used to measure the temperature of molten steel and high-temperature molten metals. Their operating temperature is usually around 1500-1700℃. When inserted into molten steel, the protective cap melts instantly, and the working end of the thermocouple is immediately exposed to the molten steel. Because the quartz tube and the thermocouple have very small heat capacity, although they can quickly reflect the temperature of the molten steel, the thermocouple and other components such as the quartz protective tube will be severely damaged in such a high-temperature environment, such as oxidation, deformation, and melting, and cannot continue to be used. Therefore, the temperature probe needs to be replaced every time the temperature is measured, which increases the cost of use. Utility Model Content

[0003] The purpose of this invention is to provide an interference-resistant converter molten steel temperature detection device, which has the advantage of low cost.

[0004] The above-mentioned technical objective of this utility model is achieved through the following technical solution: an anti-interference converter molten steel temperature detection device, comprising a support rod, one end of which is inserted with a temperature measuring mounting sleeve, one end of which is threadedly connected to a heat-conducting seat, the heat-conducting seat having a positive and negative thermocouple embedded inside, a limiting seat fixedly connected inside the temperature measuring mounting sleeve, the limiting seat being fixedly sleeved with the metal wires of the positive and negative thermocouples, one end of which is threadedly connected to a protective sleeve, the protective sleeve being slidably connected to the heat-conducting seat, and both the protective sleeve and the heat-conducting seat being made of silicon nitride bonded to silicon carbide.

[0005] The above technical solution involves installing a heat-conducting seat inside the temperature-measuring mounting sleeve, with positive and negative thermocouples installed inside the heat-conducting seat. A protective sleeve is designed on the surface of the temperature-measuring mounting sleeve. This allows the thermocouple probe to be inserted into the molten steel, with the temperature transferred through the protective sleeve to the heat-conducting seat, and then through the heat-conducting seat to the positive and negative thermocouples. The protective sleeve protects the heat-conducting sleeve and the positive and negative thermocouples inside the temperature-measuring mounting sleeve. If damage occurs, only the protective sleeve needs to be replaced, without replacing the heat-conducting sleeve and the positive and negative thermocouples, thus reducing operating costs. Furthermore, both the protective sleeve and the heat-conducting seat are made of silicon nitride combined with silicon carbide, possessing extremely high thermal conductivity, strong resistance to molten steel erosion, and excellent chemical stability, preventing reaction with molten steel and slag and avoiding contamination of the molten steel.

[0006] The present invention is further configured such that the temperature measuring mounting sleeve is made of high-temperature resistant metal material, and the support rod is made of alumina ceramic.

[0007] The above technical solution is adopted: the temperature measuring installation sleeve is made of high-temperature resistant metal material to ensure that the temperature measuring installation sleeve can be deformed in high-temperature environment. The preferred material is silicon carbide ceramic, which has extremely strong high-temperature stability and resistance to rapid cooling and heating. It is not easy to crack due to temperature difference when inserted into molten steel. The support rod is made of alumina ceramic, which maintains high rigidity at high temperature, effectively blocks heat transfer, and avoids overheating of the support rod.

[0008] The present invention is further configured such that one end of each of the two metal wires of the positive and negative thermocouples is fixedly sleeved with a first connecting plug, and the inside of the temperature measuring mounting sleeve is fixedly sleeved with a first fixing block that is fixedly sleeved with the first connecting plug.

[0009] The above technical solution is adopted: both metal wires of the positive and negative thermocouples are made of tungsten-rhenium alloy, with the positive electrode containing 25% rhenium and the negative electrode containing 3% rhenium. The first connecting plugs connecting the positive and negative thermocouples are made of the same material as the connected positive and negative metal wires.

[0010] The present invention is further configured such that a second fixing block is fixedly sleeved inside the support rod, and a first connecting sleeve is symmetrically fixedly sleeved on the second fixing block, and the first connecting plug is inserted into the first connecting sleeve.

[0011] The above technical solution requires that the material of the first connecting sleeve be consistent with that of the connected first connecting sleeve, so as to ensure the consistency of the positive and negative thermocouples transmitting the thermoelectric potential to the first connecting sleeve through the first connecting sleeve.

[0012] The present invention is further configured such that a compensating wire is welded to the center of the first connecting sleeve, and a second connecting plug is welded to the other end of the compensating wire. The second connecting plug is connected to the plug end of an external temperature measurement and display device, and a third fixing block is assembled inside the support rod and is fixedly sleeved with the second connecting plug.

[0013] By adopting the above technical solution: the material of the compensating wire and the second connecting plug should be the same as the material of the first connecting sleeve. In this way, the thermocouple main wire can be replaced, the interference of ambient temperature on the measurement can be eliminated, and the thermoelectric potential can be accurately transmitted to the external display device.

[0014] The present invention is further configured such that a fixing sleeve is threadedly connected between the support rod and the temperature measuring mounting sleeve, and the material of the fixing sleeve is the same as that of the temperature measuring mounting sleeve.

[0015] The above technical solution facilitates the connection between the support rod and the temperature measuring mounting sleeve, and makes it easy to disassemble and fix the temperature measuring mounting sleeve.

[0016] The present invention is further configured such that a tapered alignment protrusion is symmetrically fitted at one end of the temperature measuring mounting sleeve near the support rod, and an inner groove is provided on the support rod to engage with the tapered alignment protrusion.

[0017] The above technical solution facilitates the alignment of the temperature measuring installation sleeve and the support rod, ensuring that the first connecting plugs on the positive and negative poles of the thermocouple can be smoothly inserted into the first connecting sleeve on the support rod. It should be noted that the staff needs to identify the positive and negative poles of the thermocouple to prevent reversal. Special markings can be designed to complete the calibration of the positive and negative poles.

[0018] In summary, this utility model has the following beneficial effects: This invention features a heat-conducting base installed inside a temperature-measuring mounting sleeve, with positive and negative thermocouples installed inside the heat-conducting base. A protective sleeve is designed on the surface of the temperature-measuring mounting sleeve. This allows the thermocouple probe to be inserted into the molten steel, with the temperature transferred through the protective sleeve to the heat-conducting base, and then through the heat-conducting base to the positive and negative thermocouples. The protective sleeve protects the heat-conducting sleeve and the positive and negative thermocouples inside the temperature-measuring mounting sleeve. In case of damage, only the protective sleeve needs to be replaced, without replacing the heat-conducting sleeve and the positive and negative thermocouples, thus reducing operating costs. Furthermore, both the protective sleeve and the heat-conducting base are made of silicon nitride combined with silicon carbide, possessing extremely high thermal conductivity, strong resistance to molten steel erosion, and excellent chemical stability, preventing reaction with molten steel and slag and avoiding contamination of the molten steel. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a partial exploded view of the structure of this utility model; Figure 3 This is a partial structural cross-sectional view of the present invention; Figure 4 This is a partial structural cross-sectional view of the present invention.

[0020] Reference numerals in the attached drawings: 1. Support rod; 2. Temperature measuring mounting sleeve; 3. Heat-conducting base; 4. Positive and negative thermocouples; 5. Limiting seat; 6. Protective sleeve; 7. First connecting plug; 8. First fixing block; 9. Second fixing block; 10. First connecting sleeve; 11. Compensating wire; 12. Second connecting plug; 13. Third fixing block; 14. Fixing sleeve; 15. Conical alignment protrusion; 16. Inner groove. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the accompanying drawings.

[0022] Example 1: refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 An anti-interference converter molten steel temperature detection device includes a support rod 1, one end of which is inserted with a temperature measuring mounting sleeve 2. One end of the temperature measuring mounting sleeve 2 is threadedly connected to a heat-conducting seat 3. Positive and negative thermocouples 4 are embedded inside the heat-conducting seat 3. A limiting seat 5 is fixedly connected inside the temperature measuring mounting sleeve 2, and the limiting seat 5 is fixedly sleeved with the metal wires of the positive and negative thermocouples 4. One end of the temperature measuring mounting sleeve 2 is threadedly connected to a protective sleeve 6, which is slidably connected to the heat-conducting seat 3. Both the protective sleeve 6 and the heat-conducting seat 3 are made of silicon nitride bonded to silicon carbide. The device utilizes the heat-conducting seat 3 installed inside the temperature measuring mounting sleeve 2, with the positive and negative thermocouples 4 installed inside. The surface of the temperature measuring mounting sleeve 2 is designed with a protective sleeve 6, which allows the thermocouple probe to be inserted into the molten steel. The temperature is then transferred to the heat-conducting base 3 through the protective sleeve 6, and then to the positive and negative electrode thermocouples 4 through the heat-conducting base 3. The protective sleeve 6 protects the heat-conducting sleeve and the positive and negative electrode thermocouples 4 inside the temperature measuring mounting sleeve 2. If damage occurs, only the protective sleeve needs to be replaced, without replacing the heat-conducting sleeve and the positive and negative electrode thermocouples 4, which reduces the cost of use. Furthermore, both the protective sleeve 6 and the heat-conducting base 3 are made of silicon nitride combined with silicon carbide, which has extremely high thermal conductivity, strong resistance to molten steel erosion, and excellent chemical stability. They do not react with molten steel or slag, thus avoiding contamination of the molten steel.

[0023] refer to Figure 1 , Figure 2 , Figure 3 and Figure 4The temperature measuring mounting sleeve 2 is made of high-temperature resistant metal, and the support rod 1 is made of alumina ceramic. By setting the temperature measuring mounting sleeve 2 to be made of high-temperature resistant metal and the support rod 1 to be made of alumina ceramic, the temperature measuring mounting sleeve 2 can be protected from deformation in high-temperature environments. The preferred material is silicon carbide ceramic, which has extremely strong high-temperature stability and is resistant to rapid heating and cooling. It is not easy to crack due to temperature difference when inserted into molten steel. The support rod 1 is made of alumina ceramic, which maintains high rigidity at high temperatures and has a significant effect on blocking heat transfer, thus preventing the support rod 1 from overheating.

[0024] refer to Figure 2 and Figure 4 One end of each of the two metal wires of the positive and negative thermocouples 4 is fixedly fitted with a first connecting plug 7. The inside of the temperature measuring mounting sleeve 2 is fixedly fitted with a first fixing block 8 that is fixedly fitted with the first connecting plug 7. By setting the first connecting plug 7 and the first fixing block 8, both metal wires of the positive and negative thermocouples 4 are made of tungsten-rhenium alloy, wherein the positive electrode is a tungsten alloy containing 25% rhenium and the negative electrode is a tungsten alloy containing 3% rhenium. The first connecting plug 7 connecting the positive and negative thermocouples 4 is made of the same material as the connected positive and negative metal wires, which facilitates the transfer of the thermoelectric potential of the positive and negative thermocouples 4.

[0025] refer to Figure 3 The support rod 1 has a second fixing block 9 fixedly sleeved inside. The second fixing block 9 has a first connecting sleeve 10 symmetrically fixedly sleeved on it. The first connecting plug 7 is inserted into the first connecting sleeve 10. By setting the second fixing block 9 and the first connecting sleeve 10, the material of the first connecting sleeve 10 must be consistent with the material of the connected first connecting sleeve 10. This ensures the consistency of the positive and negative thermocouples 4 transmitting the thermoelectric potential to the first connecting sleeve 10 through the first connecting sleeve 10, and facilitates the reception of the thermoelectric potential transmitted by the thermocouple wires of the corresponding positive and negative thermocouples 4.

[0026] refer to Figure 1 and Figure 3 A compensating wire 11 is welded to the center of the first connecting sleeve 10, and a second connecting plug 12 is welded to the other end of the compensating wire 11. The second connecting plug 12 is plugged into the plug end of the external temperature measuring and display device. The support rod 1 is equipped with a third fixing block 13 that is fixedly connected to the second connecting plug 12. By setting the compensating wire 11, the second connecting plug 12 and the third fixing block 13, the materials of the compensating wire 11 and the second connecting plug 12 should be the same as the material of the first connecting sleeve 10. In this way, the thermocouple main wire is replaced, the interference of ambient temperature on the measurement is eliminated, and the thermoelectric potential can be accurately transmitted to the external detection and display device. The steps for its linkage with external devices are as follows: First step: The thermocouple hot junction generates a thermoelectric potential signal; Second step: The compensation cable transmits the thermoelectric potential without distortion; Third step: The cold junction compensation corrects the thermoelectric potential; Fourth step: The signal is processed and converted into a temperature value; Fifth step: The terminal device displays the temperature.

[0027] refer to Figure 1 A fixing sleeve 14 is threadedly connected between the support rod 1 and the temperature measuring mounting sleeve 2. The material of the fixing sleeve 14 is the same as that of the temperature measuring mounting sleeve 2. By setting the fixing sleeve 14, it is convenient to connect the support rod 1 and the temperature measuring mounting sleeve 2 together, and to facilitate the disassembly and fixing of the temperature measuring mounting sleeve 2.

[0028] refer to Figure 2 and Figure 3 The temperature measuring mounting sleeve 2 is symmetrically equipped with a conical alignment protrusion 15 at one end near the support rod 1. The support rod 1 has an inner groove 16 that engages with the conical alignment protrusion 15. By setting the conical alignment protrusion 15 and the inner groove 16, it is easy to align the temperature measuring mounting sleeve 2 and the support rod 1, ensuring that the first connecting plug 7 on the positive and negative poles of the positive and negative thermocouples 4 can be smoothly inserted into the first connecting sleeve 10 on the support rod 1. It should be noted that the staff needs to identify the positive and negative poles of the positive and negative thermocouples 4 to prevent them from being reversed. Special markings can be designed to complete the calibration of the positive and negative poles.

[0029] Brief description of usage: When temperature measurement is required, connect the second connector 12 of the support rod 1 to the external detection and display device. This allows the thermocouple probe to be inserted into the molten steel. It is important to note that protective measures are needed between the protective sleeve 6 and the temperature measuring mounting sleeve 2. For example, a high-temperature non-stick coating, such as a zirconia ceramic coating, with a thickness of 50-100μm, can be sprayed onto the outer surface of the temperature measuring mounting sleeve 2. The protective sleeve 6 and the heat-conducting base 3 use a conical surface fit, rather than a cylindrical surface, to facilitate separation due to differences in thermal expansion and contraction, thus ensuring the reliable separation of the protective sleeve 6 and the temperature measuring mounting sleeve 2. To prevent interconnection, the temperature is transferred to the heat-conducting base 3 via the protective sleeve 6, and then to the positive and negative thermocouples 4 via the heat-conducting base 3. The protective sleeve 6 protects the heat-conducting sleeve and the positive and negative thermocouples 4 inside the temperature measuring installation sleeve 2. If damage occurs, only the protective sleeve needs to be replaced, without replacing the heat-conducting sleeve and the positive and negative thermocouples 4, which reduces the cost of use. In addition, the materials of the protective sleeve 6 and the heat-conducting base 3 are both silicon nitride combined with silicon carbide, which have extremely high thermal conductivity, strong resistance to molten steel erosion, and excellent chemical stability. They do not react with molten steel or slag, thus avoiding contamination of the molten steel.

[0030] It should be noted that parts have a lifespan and can be replaced during regular maintenance when they no longer meet performance requirements. Deterioration in performance due to prolonged use of parts is not a design defect of this application.

[0031] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

Claims

1. An anti-interference converter molten steel temperature detection device, comprising a support rod (1), characterized in that: One end of the support rod (1) is inserted with a temperature measuring mounting sleeve (2), and one end of the temperature measuring mounting sleeve (2) is threaded with a heat-conducting seat (3). The heat-conducting seat (3) contains a positive and negative thermocouple (4). The inside of the temperature measuring mounting sleeve (2) is fixedly connected with a limiting seat (5). The limiting seat (5) is fixedly sleeved with the metal wires of the positive and negative thermocouple (4). One end of the temperature measuring mounting sleeve (2) is threaded with a protective sleeve (6). The protective sleeve (6) is slidably connected to the heat-conducting seat (3). The protective sleeve (6) and the heat-conducting seat (3) are both made of silicon nitride combined with silicon carbide.

2. The anti-interference converter molten steel temperature detection device according to claim 1, characterized in that: The temperature measuring mounting sleeve (2) is made of high-temperature resistant metal, and the support rod (1) is made of alumina ceramic.

3. The anti-interference converter molten steel temperature detection device according to claim 1, characterized in that: One end of each of the two metal wires of the positive and negative thermocouples (4) is fixedly connected to a first connecting plug (7), and the inside of the temperature measuring mounting sleeve (2) is fixedly connected to a first fixing block (8) which is fixedly connected to the first connecting plug (7).

4. The anti-interference converter molten steel temperature detection device according to claim 3, characterized in that: The support rod (1) is internally fixed with a second fixing block (9), and a first connecting sleeve (10) is symmetrically fixed on the second fixing block (9). The first connecting plug (7) is inserted into the first connecting sleeve (10).

5. The anti-interference converter molten steel temperature detection device according to claim 4, characterized in that: A compensating wire (11) is welded to the center of the first connecting sleeve (10), and a second connecting plug (12) is welded to the other end of the compensating wire (11). The second connecting plug (12) is connected to the plug end of the external temperature measurement and display device. A third fixing block (13) is assembled inside the support rod (1) and is fixedly connected to the second connecting plug (12).

6. The anti-interference converter molten steel temperature detection device according to claim 1, characterized in that: A fixing sleeve (14) is threadedly connected between the support rod (1) and the temperature measuring mounting sleeve (2), and the material of the fixing sleeve (14) is the same as that of the temperature measuring mounting sleeve (2).

7. The anti-interference converter molten steel temperature detection device according to claim 1, characterized in that: The temperature measuring mounting sleeve (2) is symmetrically fitted with a conical alignment protrusion (15) at one end near the support rod (1), and the support rod (1) has an inner groove (16) that engages with the conical alignment protrusion (15).

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