A device for calibrating a continuous temperature measuring instrument for molten steel

Abstract

The utility model relates to a molten steel continuous temperature measurement technology field discloses a kind of tool for calibrating molten steel continuous temperature measurement instrument, including temperature measurement probe fixed system and temperature measurement system, wherein, temperature measurement probe fixed system includes calibrating temperature measurement tube and fixed pipe;The first end of calibrating temperature measurement tube is used to extend into the chamber of blackbody radiation source, the first end of fixed pipe is used to install the temperature measurement probe of molten steel continuous temperature measurement instrument to be calibrated, the second end of calibrating temperature measurement tube is connected with the second end of the fixed pipe;Temperature measurement system is used to measure the actual temperature in the chamber of blackbody radiation source, this temperature is compared with the temperature measured by temperature measurement probe, to calibrate the measurement error of molten steel continuous temperature measurement instrument.It has beneficial effect in that: the temperature measurement probe of molten steel continuous temperature measurement instrument is inserted into the first end of fixed pipe, and calibration work can be carried out, simple and convenient to operate, without disassembling the molten steel temperature measurement tube in tundish.

Description

Technical Field

[0001] This utility model relates to the field of continuous temperature measurement technology for molten steel, specifically a tooling for calibrating a continuous temperature measuring instrument for molten steel. Background Technology

[0002] In metallurgical enterprises, molten metal temperature measurement is a crucial step in metallurgical production. There are generally two methods for measuring the temperature of molten steel: one is rapid thermocouple wire temperature measurement based on the thermocouple principle, and the other is continuous temperature measurement based on Planck's blackbody radiation law using infrared thermometry.

[0003] Driven by cost considerations and process control requirements, continuous temperature measurement of molten steel has gradually become an important method for controlling temperature changes in molten metal. Its operation is simple, and it can be used long-term in harsh, high-temperature environments with acceptable accuracy, provided the equipment is functioning properly. However, numerous difficulties arise when periodically calibrating this equipment.

[0004] The existing conventional verification method is to align the molten steel temperature measuring tube of the continuous molten steel temperature measuring instrument with the blackbody radiation source, so that its measuring optical path is directly aligned with the bottom of the reference blackbody radiation source cavity. After the temperature of the blackbody radiation source stabilizes, the systematic error is determined by comparing the actual temperature of the blackbody radiation source with the reading of the continuous molten steel temperature measuring instrument under test.

[0005] However, the conventional testing method has the following drawbacks:

[0006] 1. The continuous temperature measuring instrument for molten steel is inconvenient to disassemble and install:

[0007] The temperature of molten steel in the tundish typically reaches 1500℃~1600℃. (Refer to the attached instruction manual.) Figure 1 In actual production, the continuous molten steel temperature measuring instrument is installed perpendicular to the molten steel surface. The entire temperature measuring tube 5 is inserted into the molten steel to achieve sufficient heat exchange and reach thermal equilibrium. Due to the harsh temperature measurement environment, the temperature measuring tube 5 is usually a single structure fixed to the ladle cover or a fixed position. To resist the high-temperature radiation from the molten steel surface, the measuring passage of the temperature measuring tube is isolated by multiple layers of heat-resistant glass, and a cooling medium is continuously blown into the measuring passage for heat exchange and purging. Therefore, the temperature measuring tube 5 of the continuous molten steel temperature measuring instrument is strictly sealed, resulting in a large size and weight. This makes disassembly and installation in actual calibration processes inconvenient and extremely dangerous, even when disassembled in non-production environments, the risks remain significant.

[0008] 2. The dimensions of the molten steel temperature measuring tube do not match the radiation cavity of the blackbody furnace used for calibration:

[0009] During continuous temperature measurement of molten steel, the molten steel temperature measuring tube 5 needs to be inserted into the molten steel in the tundish to a depth of ≥300mm. However, the volume of the blackbody radiation source chamber in the laboratory is limited. Even though a lot of disassembly work was done before calibration, there were still problems during calibration, such as difficulty in aligning the blackbody radiation source and the molten steel temperature measuring tube being too large to be inserted into the blackbody radiation source chamber. Utility Model Content

[0010] The purpose of this utility model is to provide a tooling for calibrating a continuous molten steel temperature measuring instrument, so as to solve the problems in the above-mentioned background art: when calibrating a molten steel temperature measuring instrument, the disassembly and installation of the molten steel temperature measuring tube is difficult, and the size is not compatible with the radiation cavity of the blackbody furnace used for calibration.

[0011] To achieve the above objectives, this utility model provides the following technical solution:

[0012] A fixture for calibrating a continuous temperature measuring instrument for molten steel includes:

[0013] A temperature probe fixing system includes a calibration temperature measuring tube and a fixing tube. The first end of the calibration temperature measuring tube is inserted into the cavity of a blackbody radiation source. The first end of the fixing tube is used to mount the temperature probe of a continuous temperature measuring instrument for molten steel to be calibrated. The second end of the calibration temperature measuring tube is connected to the second end of the fixing tube. The calibration temperature measuring tube communicates with the inner cavity of the fixing tube so that the radiation signal from the blackbody radiation source can reach the temperature probe.

[0014] The temperature measurement system measures the actual temperature inside the blackbody radiation source chamber. This temperature is compared with the temperature measured by the temperature probe to verify the measurement error of the continuous molten steel temperature measuring instrument. By replacing the original molten steel temperature measuring tube with a calibration temperature measuring tube, the problems of incompatibility between the original molten steel temperature measuring tube and the laboratory blackbody radiation source chamber are effectively avoided.

[0015] Furthermore, it also includes an adjustable distance tube that is open at both ends and hollow inside. The adjustable distance tube is detachably connected to the second end of the fixed tube. The second end of the calibration temperature measuring tube is insertably disposed inside the adjustable distance tube, and the insertion depth of the calibration temperature measuring tube is adjustable so that the distance between the temperature measuring probe and the bottom of the blackbody radiation source chamber is adjustable. This setting allows the calibration distance to be adjusted to comply with the requirements in JJG 856-2015 "Working Radiation Thermometers".

[0016] Furthermore, flanges are provided at both the end of the adjusting pipe near the fixed pipe and the second end of the fixed pipe, so that the adjusting pipe and the fixed pipe are connected by flanges. This arrangement facilitates the connection between the adjusting pipe and the fixed pipe.

[0017] Furthermore, the calibration temperature measuring tube includes a calibration tube section and an insertion tube section connected together; the calibration tube section is used to be inserted into the cavity of the blackbody radiation source, and the insertion tube section is used to be inserted into the adjustment tube.

[0018] Furthermore, the temperature measurement system includes a digital multimeter, a freezing point thermostat, and a thermocouple. The thermocouple is installed inside the chamber of the blackbody radiation source. The electrode wire of the thermocouple is connected to a thermocouple compensation wire, which is inserted into the freezing point thermostat and then connected to the digital multimeter, so that the actual temperature measured by the thermocouple is displayed by the digital multimeter. With this setup, the temperature inside the blackbody radiation source chamber can be directly measured and displayed. By comparing the temperature data displayed by the digital multimeter with the displayed temperature of the continuous molten steel temperature measuring instrument, the instrument can be quickly calibrated.

[0019] Furthermore, a temperature measuring sleeve is provided on the outer periphery of the calibration tube section, and a thermocouple fixing hole is provided inside the temperature measuring sleeve for fixing the thermocouple that extends into the blackbody radiation source chamber.

[0020] Furthermore, the number of thermocouple mounting holes is multiple, and these multiple thermocouple mounting holes are evenly distributed around the axis of the calibration temperature measuring tube. By arranging multiple thermocouple mounting holes, multiple thermocouples can be set up to simultaneously measure the temperature inside the blackbody radiation source cavity, thereby correcting the error caused by uneven temperature within the cavity.

[0021] Furthermore, the number of thermocouples is multiple, and the multiple thermocouples are evenly distributed around the axis of the calibration temperature measuring tube.

[0022] Furthermore, it also includes a first support frame; the first support frame is annular and sleeved on one end of the calibration tube section near the temperature measuring probe, and the first support frame is provided with a thermocouple fixing position for fixing the thermocouple that extends into the blackbody radiation source chamber.

[0023] Furthermore, it also includes a second support frame, which is used to support the temperature measuring tube and the adjusting tube for calibration.

[0024] Furthermore, the diameters of the calibration temperature measuring tube, the adjusting tube, and the fixing tube increase sequentially. This arrangement facilitates the adjustment of the calibration distance and the installation of the temperature measuring probe.

[0025] This invention has the following advantages over the prior art:

[0026] 1. This utility model relates to a fixture for calibrating a continuous molten steel temperature measuring instrument, comprising a calibration temperature measuring tube, a fixing tube, and a temperature measuring system. During calibration, the calibration temperature measuring tube replaces the molten steel temperature measuring tube and is inserted into the chamber of a blackbody radiation source. The temperature measuring probe to be calibrated is installed inside the fixing tube. The calibration temperature measuring tube is connected to the inner cavity of the fixing tube so that the radiation signal from the blackbody radiation source can reach the temperature measuring probe. The temperature measuring system measures and displays the actual temperature inside the blackbody radiation source chamber. This temperature is compared with the temperature displayed by the continuous molten steel temperature measuring instrument to calibrate the measurement error of the instrument. This device, by designing a calibration temperature measuring tube to replace the molten steel temperature measuring tube of the continuous molten steel temperature measuring instrument, with its size adapted to the chamber of the blackbody radiation source, completely avoids the problems of removing the molten steel temperature measuring tube fixed in the tundish during existing calibration work, and the problem of the molten steel temperature measuring tube being too large and incompatible with the blackbody radiation source chamber in the laboratory. Furthermore, by setting up a temperature measurement system, the actual temperature inside the blackbody radiation source cavity can be quickly measured and displayed, facilitating temperature comparison.

[0027] 2. The tooling for calibrating the continuous molten steel temperature measuring instrument of this utility model is also equipped with an adjustable distance tube. By changing the depth of the temperature measuring tube inserted into the distance measuring tube, the distance between the temperature measuring probe and the bottom of the blackbody radiation source chamber can be adjusted to meet the calibration distance specified in JJG856-2015 "Working Radiation Thermometer".

[0028] 3. The fixture for calibrating the continuous molten steel temperature measuring instrument of this utility model includes a calibration tube section and an insertion tube section. A temperature measuring sleeve is installed around the outer periphery of the calibration tube section. One or more thermocouple fixing holes are arranged inside the temperature measuring sleeve according to actual conditions. The thermocouples are installed in the thermocouple fixing holes. When the calibration tube section extends into the chamber of the blackbody radiation source, the thermocouples immediately measure the actual temperature of the blackbody radiation source. Compared to the traditional method of installing standard thermocouples at the rear of the blackbody radiation source housing, this device's use of thermocouples at the front saves space in the calibration environment. When conditions permit, simultaneous measurement by multiple thermocouples can more easily correct errors caused by uneven temperature distribution within the blackbody radiation source chamber. Attached Figure Description

[0029] Figure 1 A schematic diagram illustrating the usage status of a continuous temperature measuring instrument for molten steel in the existing technology;

[0030] Figure 2 This is a schematic diagram of the tooling used for calibrating the continuous temperature measuring instrument for molten steel in this embodiment of the present invention;

[0031] Figure 3 This is a side view of the tooling used for calibrating the continuous temperature measuring instrument for molten steel in an embodiment of this utility model.

[0032] Figure 4 for Figure 3 Sectional view at point AA;

[0033] Figure 5 This is a schematic diagram of the structure of the calibration temperature measuring tube in the tooling for calibrating the continuous temperature measuring instrument for molten steel in this embodiment of the present invention;

[0034] Figure 6 for Figure 5 Side view;

[0035] Figure 7 for Figure 6 Sectional view at point BB;

[0036] Figure 1 The components are: 1. Temperature probe; 2. Tray; 3. Pressure plate; 4. Tundish cover; 5. Molten steel temperature measuring tube; 6. Molten steel; 7. Probe mounting frame; 8. Signal processor; 9. Cooling air source; 10. Large screen display.

[0037] Figures 2-5 In the middle: 11. Blackbody radiation source; 1101. Bottom of the blackbody radiation source chamber; 12. Temperature measuring tube for calibration; 1201. Calibration tube section; 1202. Insertion tube section; 13. Fixing tube; 14. Adjustable distance tube; 15. Flange; 16. Digital multimeter; 17. Freezing point thermostat; 18. Thermocouple; 19. Thermocouple compensating wire; 20. Temperature measuring sleeve; 21. Thermocouple fixing hole; 22. Radiated light signal channel. Detailed Implementation

[0038] 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.

[0039] It should be noted that in the description of this utility model, the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0040] Furthermore, it should be understood that, for ease of description, the dimensions of the various components shown in the accompanying drawings are not drawn to actual scale.

[0041] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined or described in one figure, it will not need to be further discussed and described in the description of the subsequent figures.

[0042] Example 1:

[0043] like Figures 2-4 As shown, a fixture for calibrating a continuous molten steel temperature measuring instrument includes: a temperature probe fixing system and a temperature measuring system; the temperature probe fixing system includes a calibration temperature measuring tube 12 and a fixing tube 13; the first end of the calibration temperature measuring tube 12 is used to extend into the cavity of a blackbody radiation source 11 (insertion depth of 300mm), the first end of the fixing tube 13 is used to install the temperature measuring probe 1 of the continuous molten steel temperature measuring instrument to be calibrated, the second end of the calibration temperature measuring tube 12 is connected to the second end of the fixing tube 13, and the inner cavity of the calibration temperature measuring tube 12 and the fixing tube 13 are connected to allow the radiation light signal from the blackbody radiation source to reach the temperature measuring probe. Because the molten steel temperature measuring tube of the continuous molten steel temperature measuring instrument needs to be fixed and embedded in the tundish to continuously measure the temperature of the molten steel in the tundish. Meanwhile, the molten steel temperature measuring tube is heavily protected and strictly sealed, making disassembly and installation during calibration inconvenient and extremely dangerous. Furthermore, because the molten steel temperature measuring tube is inserted into the molten steel to a depth of ≥300mm, differences in its size and volume can lead to alignment difficulties or prevent its insertion into the blackbody radiation source chamber. Demonstration has shown that directly disassembling the temperature measuring probe is much simpler and more convenient than removing the molten steel temperature measuring tube from the tundish. Therefore, this invention replaces the original molten steel temperature measuring tube 5 of the continuous molten steel temperature measuring instrument with a calibration temperature measuring tube, effectively avoiding the above problems. During calibration, the temperature measuring probe 1 of the continuous molten steel temperature measuring instrument can be removed and directly inserted into the fixed tube, which is convenient, safe, and fast, eliminating the need for complex and difficult disassembly and assembly work.

[0044] The temperature measurement system in this embodiment is used to measure the actual temperature inside the blackbody radiation source 11 chamber, and compare this temperature with the temperature measured by the temperature probe 1, thereby verifying the measurement error of the continuous steel temperature measuring instrument.

[0045] The calibration temperature measuring tube 12 designed in this embodiment is lighter and smaller in size than the original molten steel temperature measuring tube, and possesses excellent heat transfer and heat resistance capabilities, allowing it to be directly inserted into the bottom 1101 of the blackbody radiation source chamber. The calibration temperature measuring tube 12 is made of the same material as the blackbody radiation source chamber, typically silicon carbide, but other materials with good temperature resistance can also be selected. Through thermal equilibrium between the calibration temperature measuring tube 12 and the blackbody radiation source chamber, it replaces the original molten steel temperature measuring tube, thus meeting the connection and calibration requirements of the continuous molten steel temperature measuring instrument. The outer diameter of the calibration temperature measuring tube 12 in this embodiment is designed based on the commonly used φ40mm diameter of high-temperature blackbody radiation sources in the industry. If the blackbody radiation source diameter is ≥40mm, it is recommended to use a calibration temperature measuring tube matching this size.

[0046] refer to Figure 2 and Figure 4 In this embodiment, an adjustable-distance tube 14 with openings at both ends and a hollow interior is also included. The second end of the adjustable-distance tube 14 is detachably connected to the second end of the fixed tube 13. The second end of the calibration temperature measuring tube 12 is insertably disposed within the adjustable-distance tube 14, and the insertion depth of the calibration temperature measuring tube 12 is adjustable so that the distance between the temperature measuring probe 1 and the bottom 1101 of the blackbody radiation source chamber is adjustable. The inner cavities of the calibration temperature measuring tube 12, the adjustable-distance tube 14, and the fixed tube 13 form a radiation light signal channel 22, satisfying the calibration environment of the temperature measuring probe 1. The calibration temperature measuring tube 12 and the adjustable-distance tube 14 are sleeved together to form an assembly relationship with a guiding function, which can quickly align and facilitate the smooth conduct of the calibration process. At the same time, the sleeved structure can form a relatively stable and sealed environment between the temperature measuring probe 1 and the blackbody radiation source 11, which is beneficial for isolating the interference of gas disturbances and background radiation in the environment. Because the observation target size of the blackbody radiation source 11 is smaller than that of the original molten steel temperature measuring tube, the calibration distance needs to be adjusted according to the requirements of Clause 7.3.3(b) and Appendix A of the Verification Procedure for Working Radiation Thermometers in JJG 856-2015. In actual use, the depth of the calibration temperature measuring tube 12 inserted into the adjustment tube 14 can be adjusted to achieve the calibration distance adjustment. According to the instruction manual, in the socketed state, the distance between the temperature measuring probe 1 of the molten steel continuous temperature measuring instrument and the bottom of the calibration temperature measuring tube 12 is 600mm to 900mm.

[0047] In this embodiment, flanges 15 are provided at both the end of the adjusting tube 14 near the fixed tube 13 and the second end of the fixed tube 13, so that the adjusting tube 14 and the fixed tube 13 are connected by flanges, facilitating their connection and disassembly. The diameters of the calibration temperature measuring tube 12, the adjusting tube 14, and the fixed tube 13 increase sequentially. This arrangement facilitates the adjustment of the calibration distance and the installation of the temperature measuring probe 1.

[0048] refer to Figures 5-7The calibration temperature measuring tube 12 includes a calibration tube section 1201 and an insertion tube section 1202 that are connected to each other. The calibration tube section 1201 is used to insert into the cavity of the blackbody radiation source 1, and the insertion tube section 1202 is used to connect with the adjusting tube 14. By dividing the calibration temperature measuring tube 12 into two sections, the two sections are internally connected but have different outer diameters, so that it can be matched with both the cavity of the blackbody radiation source 1 and the adjusting tube 14.

[0049] refer to Figure 2 The temperature measurement system includes a digital multimeter 16, a freezing point thermostat 17, and a thermocouple 18. The thermocouple 18 is disposed within the chamber of the blackbody radiation source 11. The electrode wire of the thermocouple 18 is connected to a thermocouple compensation wire 19. The thermocouple compensation wire 19 is inserted into the freezing point thermostat 17 and then connected to the digital multimeter 16, so that the actual temperature measured by the thermocouple 18 is displayed on the digital multimeter 16. This setup allows for direct measurement and display of the temperature within the blackbody radiation source chamber. By comparing the temperature data displayed on the digital multimeter 16 with the displayed temperature of the continuous molten steel temperature measuring instrument, the instrument can be quickly calibrated.

[0050] Specifically, such as Figure 4 , Figure 5 and Figure 7 As shown, a temperature measuring sleeve 20 is provided on the outer periphery of the calibration tube section 1201. A thermocouple fixing hole 21 is provided inside the temperature measuring sleeve 20 for fixing the thermocouple 18 that extends into the blackbody radiation source chamber. The thermocouple fixing hole 21 extends to the bottom of the calibration tube section 1201, allowing the thermocouple to be inserted into the bottom of the calibration tube section 1201, ensuring accurate temperature measurement.

[0051] In this embodiment, there are multiple thermocouple fixing holes 21, which are evenly distributed around the axis of the calibration temperature measuring tube 12. By arranging multiple thermocouple fixing holes 21, multiple thermocouples 18 can be set up to simultaneously measure the temperature inside the blackbody radiation source 11 chamber, thereby correcting the error caused by uneven temperature inside the chamber.

[0052] Specifically, refer to Figure 6 and Figure 7 The device has three thermocouple mounting holes, allowing for the simultaneous insertion of three thermocouples 18. This facilitates the real-time acquisition of the actual temperature inside the blackbody radiation source 11 cavity using standard thermocouples, enabling more convenient temperature comparison. Furthermore, compared to the traditional method of mounting thermocouples at the rear of the chamber in a blackbody radiation source 11, mounting them at the front saves space in the calibration environment. When conditions permit, inserting all three thermocouples simultaneously allows for more convenient correction of non-uniformity errors within the blackbody cavity.

[0053] In another embodiment, a second support frame is also included, which supports the calibration temperature measuring tube 12 and the adjusting tube 14. This arrangement ensures the stability of the connection between the calibration temperature measuring tube 12 and the adjusting tube 14, and ensures that the radiation light signal channel 22 is distributed horizontally, thus avoiding calibration errors.

[0054] When using this device for testing, the following operating steps are included:

[0055] (1) Insert the calibration temperature measuring tube into the blackbody radiation source cavity and insert it to the bottom; insert the standard thermocouple into the thermocouple fixing hole and make sure it is inserted to the bottom;

[0056] (2) Connect the positive and negative terminals of the standard thermocouple electrode wires to the thermocouple compensation wires respectively, and insert them into the freezing point thermostat. Then connect the thermocouple compensation wires to the positive and negative terminals of the voltage range of the digital multimeter according to the positive and negative terminals.

[0057] (3) The blackbody radiation source begins to heat up, and the digital multimeter is turned on to preheat.

[0058] (4) Connect the adjusting pipe and the fixed pipe through a flange and fix them with bolts to prevent them from moving or shifting in relative position;

[0059] (5) Place the continuous temperature measuring instrument for molten steel to be tested stably on the workbench, insert the temperature measuring probe into the fixed tube, and make its measuring axis coincide with the measuring axis of the temperature measuring tube used for testing;

[0060] (6) According to the instruction manual and D:S parameters of the molten steel continuous temperature measuring instrument, after calculating the calibration distance based on the diameter of the calibration temperature measuring tube, adjust the distance between the measuring probe and the bottom of the cavity so that the total length of the insertion depth (300mm) + L of the calibration temperature measuring tube can meet the calibration distance requirements.

[0061] (7) Begin the verification process, and conduct the verification according to JJG 856-2015 "Working Radiation Thermometers";

[0062] (8) After the verification work is completed, the temperature of the blackbody radiation source shall be gradually reduced to room temperature in a controlled manner according to the instruction manual.

[0063] (9) Disassemble the instruments: Pull the temperature probe out of the fixed tube and disconnect the connection between the adjusting tube and the fixed rod; remove the standard thermocouple; pull the calibration temperature measuring tube out of the blackbody radiation source cavity; clean up the site.

[0064] In the continuous molten steel temperature measuring instrument, the temperature sensing element is a temperature probe. The inner cavity of the molten steel temperature measuring tube has a channel for the passage of radiated light signals. The temperature probe senses the radiated light signals within the channel and converts them into electrical signals. When the molten steel temperature measuring tube is inserted into the molten steel, the conduction effect of the high-temperature molten steel causes the channel inside the molten steel temperature measuring tube to heat up. The radiated light signals reach the temperature probe located in the channel, causing it to sense the change in the radiated light signals and convert them into electrical signals, which are then displayed on the large screen display 10. Because the original molten steel temperature measuring tube is in a fully protected state, a lot of disassembly work is required before each calibration. Moreover, the size of the molten steel temperature measuring tube 5 varies, while the inner diameter of the blackbody radiation source used for calibration in the industry is 40mm, making insertion, alignment, and calibration distance adjustment during the calibration process quite difficult. In light of the above issues, this utility model, referencing the mechanical structure of a continuous molten steel temperature measuring instrument, and fully considering factors such as the usage requirements in industrial settings and the technical requirements of the calibration environment, makes disassembling the temperature probe simpler and more convenient than disassembling the molten steel temperature measuring tube. Therefore, a small-sized temperature measuring tube, sized to accommodate a 40mm diameter blackbody radiation source, is designed to replace the original temperature measuring tube, thus meeting the connection and calibration requirements of the continuous molten steel temperature measuring instrument. During calibration, the temperature probe is simply removed from the radiation signal channel of the original continuous molten steel temperature measuring instrument and inserted into the fixing tube 13 of this device to complete the connection. This efficient and rapid process eliminates the need for complex and difficult disassembly and assembly work.

[0065] Example 2:

[0066] This embodiment is the same as embodiment 1 except for the following technical features:

[0067] In this embodiment, there are multiple thermocouples 18, and the multiple thermocouples 18 are evenly distributed around the axis of the calibration temperature measuring tube 20.

[0068] Furthermore, it also includes a first support frame; the first support frame is annular and sleeved on the end of the calibration tube section 1201 near the temperature measuring probe 1. The first support frame is provided with thermocouple fixing positions for fixing thermocouples inserted into the blackbody radiation source chamber. There are multiple thermocouple fixing positions, which are evenly distributed around the axis of the calibration temperature measuring tube 12. By arranging multiple thermocouple fixing positions, multiple thermocouples can be placed simultaneously to measure the temperature inside the blackbody radiation source 11 chamber at the same time, thereby correcting the error of uneven temperature inside the chamber.

[0069] 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 fixture for calibrating a continuous temperature measuring instrument for molten steel, characterized in that, include: A temperature probe fixing system includes a calibration temperature measuring tube and a fixing tube. The first end of the calibration temperature measuring tube is inserted into the cavity of a blackbody radiation source. The first end of the fixing tube is used to mount the temperature probe of a continuous temperature measuring instrument for molten steel to be calibrated. The second end of the calibration temperature measuring tube is connected to the second end of the fixing tube. The calibration temperature measuring tube communicates with the inner cavity of the fixing tube so that the radiation signal from the blackbody radiation source can reach the temperature probe. The temperature measurement system is used to measure the actual temperature inside the blackbody radiation source chamber. This temperature is compared with the temperature measured by the temperature probe to verify the measurement error of the continuous steel temperature measuring instrument.

2. The fixture for calibrating a continuous steel temperature measuring instrument according to claim 1, characterized in that: It also includes an adjustable distance tube that is open at both ends and hollow inside. The adjustable distance tube is detachably connected to the second end of the fixed tube. The second end of the calibration temperature measuring tube is insertably disposed in the adjustable distance tube, and the insertion depth of the calibration temperature measuring tube is adjustable so that the distance between the temperature measuring probe and the bottom of the blackbody radiation source chamber is adjustable.

3. The fixture for calibrating a continuous steel temperature measuring instrument according to claim 2, characterized in that: Flanges are provided at one end of the adjustable pipe near the fixed pipe and at the second end of the fixed pipe, so that the adjustable pipe and the fixed pipe are connected by the flanges.

4. The fixture for calibrating a continuous steel temperature measuring instrument according to claim 2, characterized in that: The calibration temperature measuring tube includes a calibration tube section and an insertion tube section that are connected to each other; the calibration tube section is used to be inserted into the cavity of the blackbody radiation source, and the insertion tube section is used to be inserted into the adjustment tube.

5. The fixture for calibrating a continuous steel temperature measuring instrument according to claim 4, characterized in that: The temperature measurement system includes a digital multimeter, a freezing point thermostat, and a thermocouple. The thermocouple is placed inside the chamber of the blackbody radiation source. The electrode wire of the thermocouple is connected to a thermocouple compensation wire. The thermocouple compensation wire is inserted into the freezing point thermostat and then connected to the digital multimeter so that the actual temperature measured by the thermocouple is displayed by the digital multimeter.

6. The fixture for calibrating a continuous steel temperature measuring instrument according to claim 5, characterized in that: A temperature measuring sleeve is provided on the outer periphery of the calibration tube section, and a thermocouple fixing hole is provided inside the temperature measuring sleeve for fixing the thermocouple that extends into the blackbody radiation source chamber.

7. The fixture for calibrating a continuous steel temperature measuring instrument according to claim 6, characterized in that: The thermocouple fixing holes are multiple, and the multiple thermocouple fixing holes are evenly distributed around the axis of the calibration temperature measuring tube.

8. The fixture for calibrating a continuous steel temperature measuring instrument according to claim 6, characterized in that: The thermocouples are multiple, and the multiple thermocouples are evenly distributed around the axis of the calibration temperature measuring tube.

9. The fixture for calibrating a continuous steel temperature measuring instrument according to claim 5, characterized in that: It also includes a first support frame; the first support frame is ring-shaped and sleeved on one end of the calibration tube section near the temperature measuring probe, and the first support frame is provided with a thermocouple fixing position for fixing the thermocouple that extends into the blackbody radiation source chamber.

10. The fixture for calibrating a continuous steel temperature measuring instrument according to claim 2, characterized in that: It also includes a second support frame, which is used to support the temperature measuring tube and the adjusting tube for calibration.

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