Tool for calibrating molten steel continuous thermodetector

Abstract

The invention relates to the technical field of molten steel continuous temperature measurement, and discloses a tool for verification of a molten steel continuous thermodetector, which comprises a temperature measurement probe fixing system and a temperature measurement system, and is characterized in that the temperature measurement probe fixing system comprises a temperature measurement tube for verification and a fixing tube; the first end of the temperature measuring tube for verification is used for extending into a cavity of a blackbody radiation source, the first end of the fixed tube is used for installing a temperature measuring probe of the molten steel continuous thermodetector to be verified, and the second end of the temperature measuring tube for verification is connected with the second end of the fixed tube; the temperature measurement system is used for measuring the actual temperature in the blackbody radiation source chamber, and the actual temperature is compared with the temperature measured by the temperature measurement probe, so that the measurement error of the molten steel continuous thermodetector is detected. The molten steel continuous thermodetector has the advantages that the temperature measuring probe of the molten steel continuous thermodetector is inserted into the first end of the fixing pipe, verification work can be carried out, operation is easy and convenient, and a molten steel temperature measuring pipe in the tundish does not need to be disassembled and assembled.

Description

Technical Field

[0001] The invention relates to the technical field of continuous temperature measurement of molten steel, in particular to a tool for calibrating a continuous temperature measuring instrument for molten steel. Background Art

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

[0003] Due to cost considerations and process control needs, continuous temperature measurement of molten steel has become an increasingly important method for managing molten metal temperature fluctuations. Its simple operation, along with acceptable accuracy, allows for long-term operation in harsh, high-temperature environments, provided the protective equipment is functioning properly. However, periodic metrological verification of this equipment presents numerous challenges.

[0004] The existing conventional calibration method is to align the molten steel temperature measuring tube of the molten steel continuous temperature meter with the blackbody radiation source so that its measuring light path is directly aligned with the bottom of the reference blackbody radiation source cavity. After the temperature of the blackbody radiation source stabilizes, the system error is determined by comparing the actual temperature of the blackbody radiation source with the indication of the molten steel continuous temperature meter being tested.

[0005] However, there are the following disadvantages when using conventional methods for verification:

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

[0007] The temperature of the molten steel in the tundish is usually 1500℃~1600℃, refer to the appendix of the manual. Figure 1 The installation method of the continuous molten steel temperature measuring instrument used in actual production is to install it perpendicular to the molten steel liquid surface. The molten steel temperature measuring tube 5 is completely inserted into the molten steel to complete the sufficient heat exchange and achieve thermal equilibrium. Due to the harsh temperature measurement environment, the molten steel temperature measuring tube 5 is usually an integral structure fixed to the ladle cover or a fixed position. In order to resist the high-temperature radiation of the molten steel surface, the measuring path of the molten steel temperature measuring tube is isolated by multiple layers of heat-resistant glass, and a cooling medium is continuously blown into the measuring path to play a role in heat exchange and purging. Therefore, the molten steel temperature measuring tube 5 of the continuous molten steel temperature measuring instrument is strictly sealed, which leads to a large volume and mass. The actual calibration process brings many inconveniences and is very dangerous to disassemble and install. Even if it is disassembled in non-production situations, the risk is still very high.

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

[0009] During continuous steel temperature measurement, the steel temperature measuring tube 5 needs to be inserted into the tundish to a depth of 300mm or more. However, the blackbody radiation source chamber in the laboratory is limited in size. Even with extensive pre-calibration disassembly, calibration still presents challenges: difficulty aligning the blackbody radiation source and the steel temperature measuring tube being too large to fit into the chamber. Summary of the Invention

[0010] The purpose of the present invention is to provide a tool for calibrating a continuous molten steel temperature measuring instrument to solve the problems in the above-mentioned background technology when calibrating the molten steel temperature measuring instrument: the molten steel temperature measuring tube is difficult to disassemble and install, and its size does not match the radiation cavity of the blackbody furnace used for calibration.

[0011] To achieve the above object, the present invention provides the following technical solutions:

[0012] A tool for calibrating a continuous molten steel temperature measuring instrument, comprising:

[0013] A temperature probe fixing system, comprising a calibration temperature measuring tube and a fixing tube; the first end of the calibration temperature measuring tube is configured to extend into the chamber of the blackbody radiation source; the first end of the fixing tube is configured to mount a temperature measuring probe of a continuous molten steel temperature measuring instrument to be tested; the second end of the calibration temperature measuring tube is connected to the second end of the fixing tube; the calibration temperature measuring tube is in communication with the inner cavity of the fixing tube so that the radiation light signal from the blackbody radiation source can reach the temperature measuring probe;

[0014] The temperature measurement system measures the actual temperature within the blackbody radiation source chamber. This temperature is then compared with the temperature measured by the temperature probe to verify the measurement error of the molten steel continuous temperature measuring instrument. By replacing the original molten steel temperature measuring tube with a calibration temperature measuring tube, the problem of the original molten steel temperature measuring tube being removed and installed unchanged, thus preventing it from being mismatched with the laboratory blackbody radiation source chamber, is effectively avoided.

[0015] Furthermore, the device includes a hollow, open-ended, adjustable-distance tube. 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 within the adjustable-distance tube. The insertion depth of the calibration temperature measuring tube is adjustable, allowing the distance between the temperature measuring probe and the bottom of the blackbody radiation source chamber to be adjusted. This arrangement allows the calibration distance to be adjusted to comply with the requirements of JJG 856-2015, "Working Radiation Thermometers."

[0016] Furthermore, flanges are provided at one end of the adjustable tube close to the fixed tube and at the second end of the fixed tube, so that the adjustable tube and the fixed tube are connected via the flanges. This arrangement facilitates the connection between the adjustable tube and the fixed tube.

[0017] Furthermore, the calibration temperature measuring tube includes a connected calibration tube section and an inserting tube section; the calibration tube section is used to be inserted into the chamber of the blackbody radiation source, and the inserting tube section is used to be plugged into the distance regulating tube.

[0018] Furthermore, the temperature measurement system includes a digital multimeter, an ice point thermostat, and a thermocouple; the thermocouple is disposed within the chamber of the blackbody radiation source, with the thermocouple's electrode wire connected to a thermocouple compensation wire. The thermocouple compensation wire is inserted into the ice point thermostat and then connected to the digital multimeter, so that the actual temperature measured by the thermocouple is displayed on the digital multimeter. This arrangement allows for direct measurement and display of the temperature within the blackbody radiation source chamber. By comparing the temperature data displayed by the digital multimeter with the temperature displayed by the molten steel continuous temperature meter, the molten steel continuous temperature meter can be rapidly 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 in the temperature measuring sleeve for fixing a thermocouple extending into the blackbody radiation source chamber.

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

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

[0022] Furthermore, it also includes a first support frame; the first support frame is annular and is mounted on one end of the calibration tube section close to the temperature measuring probe, and the first support frame is provided with a thermocouple fixing position for fixing the thermocouple extending 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 distance adjusting tube for calibration.

[0024] Furthermore, the diameters of the temperature measuring tube for calibration, the distance-adjusting tube, and the fixed tube are increased in sequence, which facilitates adjustment of the calibration distance and installation of the temperature measuring probe.

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

[0026] 1. The present invention provides a calibration tool for a continuous molten steel temperature measuring instrument, comprising a calibration temperature measuring tube, a fixed tube, and a temperature measurement 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. A temperature probe to be calibrated is installed in the fixed tube. The calibration temperature measuring tube is connected to the inner cavity of the fixed tube so that the radiation light signal from the blackbody radiation source can reach the temperature measuring probe. The temperature measurement system measures and displays the actual temperature within the chamber of the blackbody radiation source, and compares this temperature with the temperature displayed by the continuous molten steel temperature measuring instrument, thereby calibrating the measurement error of the continuous molten steel temperature measuring instrument. By designing the calibration temperature measuring tube to replace the molten steel temperature measuring tube of the continuous molten steel temperature measuring instrument, the device is sized to fit the chamber of the blackbody radiation source. This completely avoids the problem of removing the fixed molten steel temperature measuring tube in the tundish during calibration, as well as the problem of the molten steel temperature measuring tube being too large and not compatible with the chamber of the blackbody radiation source in the laboratory. Moreover, by setting up a temperature measurement system, the actual temperature in the blackbody radiation source chamber can be quickly measured and displayed, and temperature comparison can be conveniently performed.

[0027] 2. The calibration tooling of the continuous steel temperature measuring instrument of the present invention is also provided with a distance-adjusting tube. By changing the depth of the calibration temperature measuring tube inserted into the distance-adjusting tube, the distance between the temperature measuring probe and the bottom of the blackbody radiation source chamber is adjusted to meet the calibration distance specified in JJG856-2015 "Working Radiation Thermometer".

[0028] 3. The calibration fixture for the continuous temperature measuring instrument for molten steel of the present invention comprises a calibration temperature measuring tube comprising a calibration tube section and a plug-in tube section; a temperature measuring sleeve is provided on the periphery of the calibration tube section, and one or more thermocouple fixing holes are arranged in the temperature measuring sleeve according to actual conditions, and the thermocouples are provided in the thermocouple fixing holes. When the calibration tube section is extended into the chamber of the blackbody radiation source, the thermocouples immediately measure the actual temperature of the blackbody radiation source. Compared with the traditional method of installing a standard thermocouple at the rear of the blackbody radiation source box, the arrangement of the thermocouple at the front of the device is conducive to saving calibration environment space. When conditions permit, when multiple thermocouples are measured simultaneously, the error caused by uneven temperature distribution in the chamber of the blackbody radiation source can be corrected more conveniently. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the use status of a molten steel continuous temperature measuring instrument in the prior art;

[0030] Figure 2 Schematic diagram of the structure of the tooling for calibrating the continuous molten steel temperature measuring instrument in an embodiment of the present invention;

[0031] Figure 3 A side view of a tool for calibrating a continuous molten steel temperature measuring instrument according to an embodiment of the present invention;

[0032] Figure 4 for Figure 3 Cross-sectional view at AA in the middle;

[0033] Figure 5 Schematic diagram of the structure of the temperature measuring tube for calibration in the tooling for calibrating the continuous temperature measuring instrument for molten steel in an embodiment of the present invention;

[0034] Figure 6 for Figure 5 Side view of

[0035] Figure 7 for Figure 6 Cross-sectional view at the middle BB;

[0036] Figure 1 Middle: 1. Temperature probe; 2. Tray; 3. Weight; 4. Tundish cover; 5. Molten steel temperature measuring tube; 6. Molten steel; 7. Probe mounting bracket; 8. Signal processor; 9. Cooling air source; 10. Large-screen display.

[0037] Figure 2-Figure 5 Middle: 11. Blackbody radiation source; 1101. Bottom of blackbody radiation source chamber; 12. Calibration temperature measuring tube; 1201. Calibration tube section; 1202. Insertion tube section; 13. Fixed tube; 14. Adjustable distance tube; 15. Flange; 16. Digital multimeter; 17. Ice point thermostat; 18. Thermocouple; 19. Thermocouple compensation wire; 20. Temperature measuring sleeve; 21. Thermocouple fixing hole; 22. Channel for radiated light signal. DETAILED DESCRIPTION

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments 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.

[0039] It should be noted that, in the description of the present invention, the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0040] In addition, it should be understood that for the convenience of description, the sizes of the various components shown in the drawings are not drawn according to the actual scale.

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

[0042] Example 1:

[0043] like Figure 2-Figure 4 As shown, a tool for calibrating a continuous molten steel temperature measuring instrument comprises: 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 chamber of a blackbody radiation source 11 (insertion depth is 300 mm), the first end of the fixing tube 13 is used to mount 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 cavities of the calibration temperature measuring tube 12 and the fixing tube 13 are in communication so that the radiation light signal from the blackbody radiation source can 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, it can continuously measure the temperature of the molten steel in the tundish. At the same time, the molten steel temperature measuring tube is protected by layers of protection and is tightly sealed, making it inconvenient and dangerous to remove and install during calibration. Furthermore, due to the molten steel temperature measuring tube's insertion depth of ≥300mm, its size and volume can make alignment difficult or even impossible to insert into the blackbody radiation source chamber. It has been demonstrated that directly removing the temperature measuring probe is much simpler and more convenient than removing the molten steel temperature measuring tube from the tundish. Therefore, the present invention effectively avoids these issues by designing a calibration temperature measuring tube to replace the original molten steel temperature measuring tube 5 of the continuous molten steel temperature measuring instrument. During calibration, the temperature measuring probe 1 of the continuous molten steel temperature measuring instrument is removed and directly inserted into the fixed tube. This is convenient, safe, and quick, eliminating the need for complex and difficult disassembly and assembly.

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

[0045] The calibration temperature measuring tube 12 designed in this embodiment is lighter and smaller than the original molten steel temperature measuring tube. It has excellent heat transfer and heat resistance and can 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 cavity, typically silicon carbide, but other materials with excellent heat resistance can also be selected. Through thermal equilibrium between the calibration temperature measuring tube 12 and the blackbody radiation source cavity, it can replace the original molten steel temperature measuring tube to meet the connection and calibration requirements of the molten steel continuous temperature measuring instrument. The outer diameter of the calibration temperature measuring tube 12 in this embodiment is designed based on the φ40mm diameter of the high-temperature blackbody radiation source commonly used in the industry. If the blackbody radiation source diameter is ≥40mm, it is recommended to use a calibration temperature measuring tube that matches this size.

[0046] refer to Figure 2 and Figure 4 This embodiment also includes a hollow interior and open end spacing tube 14. The spacing 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 spacing tube 14, and the insertion depth of the calibration temperature measuring tube 12 is adjustable, thereby enabling adjustable distance between the temperature probe 1 and the bottom 1101 of the blackbody radiation source chamber. The inner cavity of the calibration temperature measuring tube 12, the spacing tube 14, and the fixed tube 13 forms a channel 22 for the radiated light signal, providing a suitable calibration environment for the temperature measuring probe 1. The calibration temperature measuring tube 12 and the spacing tube 14 are nested together, forming a guiding assembly relationship that allows for quick alignment and facilitates smooth calibration. Furthermore, the nested structure creates a relatively stable and sealed environment between the temperature measuring probe 1 and the blackbody radiation source 11, effectively isolating the temperature measuring probe 1 from interference from ambient gas disturbances and background radiation. Because the observation target surface of the blackbody radiation source 11 is smaller than the original molten steel temperature measuring tube, the required calibration distance is adjusted according to the requirements of Clause 7.3.3(b) and Appendix A of the Verification Procedure for Working Radiation Thermometers (JJG 856-2015). In actual use, the insertion depth of the calibration temperature measuring tube 12 into the adjustable distance tube 14 can be adjusted to achieve the desired calibration distance. According to the manual, when connected, 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 ranges from 600mm to 900mm.

[0047] In this embodiment, flanges 15 are provided on both the end of the adjustable tube 14 closest to the fixed tube 13 and the second end of the fixed tube 13. This connection facilitates connection and removal of the adjustable tube 14 and the fixed tube 13. The diameters of the calibration temperature measuring tube 12, the adjustable tube 14, and the fixed tube 13 increase in sequence. This arrangement facilitates adjustment of the calibration distance and installation of the temperature probe 1.

[0048] refer to Figure 5-Figure 7The calibration temperature measuring tube 12 includes a connected calibration tube section 1201 and an inserting tube section 1202. The calibration tube section 1201 is inserted into the chamber of the blackbody radiation source 1, and the inserting tube section 1202 is connected to the adjustable distance 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 match the chamber of the blackbody radiation source 1 and connect to the adjustable distance tube 14.

[0049] refer to Figure 2 The temperature measurement system includes a digital multimeter 16, an ice 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 ice 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 arrangement allows the temperature within the blackbody radiation source chamber to be directly measured and displayed. By comparing the temperature data displayed by the digital multimeter 16 with the temperature displayed by the molten steel continuous temperature meter, the molten steel continuous temperature meter can be quickly calibrated.

[0050] Specifically, if Figure 4 、 Figure 5 and Figure 7 As shown, a temperature measuring sleeve 20 is provided around the periphery of the calibration tube section 1201. A thermocouple fixing hole 21 is provided within the thermometric sleeve 20 for securing the thermocouple 18 extending into the blackbody radiation source chamber. 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, the number of the thermocouple fixing holes 21 is multiple, and the multiple thermocouple fixing holes 21 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 to simultaneously measure the temperature within the chamber of the blackbody radiation source 11, thereby correcting the error caused by uneven temperature within the chamber.

[0052] Specifically, refer to Figure 6 and Figure 7 The three thermocouple mounting holes allow for simultaneous insertion of three thermocouples 18. This facilitates the use of standard thermocouples to obtain the true temperature within the blackbody radiation source 11 cavity in real time, making temperature comparisons more convenient. Furthermore, compared to traditional blackbody radiation source 11 methods of installing thermocouples at the rear of the cavity, installing thermocouples at the front of the cavity conserves calibration space. If conditions permit, simultaneous insertion of three thermocouples allows for more convenient correction of blackbody cavity non-uniformity errors.

[0053] In another embodiment, a second support frame is further included to support the calibration temperature measuring tube 12 and the adjustable distance tube 14. This arrangement ensures the stability of the connection between the calibration temperature measuring tube 12 and the adjustable distance tube 14, and distributes the channel 22 of the radiated light signal in the horizontal direction, thereby avoiding calibration errors.

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

[0055] (1) Insert the temperature measuring tube for calibration 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 electrodes of the standard thermocouple to the thermocouple compensation wires respectively, and insert them into the ice point thermostat. Then, connect the thermocouple compensation wires to the positive and negative electrodes of the voltage range of the digital multimeter according to the positive and negative electrodes.

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

[0058] (4) Connect the adjustable tube to the fixed tube through a flange and fix them with bolts so that they do not move or sway relative to each other;

[0059] (5) Place the molten steel continuous temperature measuring instrument to be tested steadily 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 for testing;

[0060] (6) According to the instructions of the continuous steel temperature measuring instrument and the D:S parameters, after calculating the calibration distance in combination with 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 of the calibration temperature measuring tube (300mm) + L can meet the calibration distance requirements;

[0061] (7) Start the verification process. The verification method is based on JJG 856-2015 “Working Radiation Thermometer”;

[0062] (8) After the verification work is completed, the temperature of the blackbody radiation source shall be controlled and gradually lowered to room temperature according to the instructions of the blackbody radiation source;

[0063] (9) Disassemble the instrument: pull out the temperature probe from the fixed tube, remove the connection between the adjustable distance tube and the fixed rod; remove the standard thermocouple; pull out the temperature measuring tube for calibration from the blackbody radiation source cavity; clean up the site.

[0064] The temperature sensing element in a continuous molten steel temperature measuring instrument 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 is used to sense the radiated light signals in the channel and convert 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, which senses the changes in the radiated light signals and converts them into electrical signals. The temperature is then displayed on a large-screen display 10. Because the original molten steel temperature measuring tube is configured as a whole and protected, a large amount of disassembly work is required before each calibration. Moreover, the molten steel temperature measuring tube 5 varies in size, and the inner diameter of the chamber of the blackbody radiation source used for calibration in the industry is 40 mm. This makes insertion, alignment, and calibration distance adjustment relatively difficult during the calibration process. In light of the above issues, the present invention, taking into account the mechanical structure of a continuous molten steel temperature measuring instrument and taking into account factors such as the requirements for use in industrial sites and the technical requirements of the calibration environment, has designed a smaller temperature measuring tube sized to accommodate a 40mm diameter blackbody radiation source, replacing the original one. This meets the connection and calibration requirements of the continuous molten steel temperature measuring instrument. During calibration, the temperature measuring probe is removed from the original continuous molten steel temperature measuring instrument's optical signal channel and inserted into the fixed tube 13 of the present device to complete the connection efficiently and quickly, eliminating the need for complex and difficult disassembly and assembly.

[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 temperature measuring tube 20 for calibration.

[0068] Furthermore, the system includes a first support frame; the first support frame is annular and is mounted on one end of the calibration tube section 1201 near the temperature probe 1. The first support frame is provided with a thermocouple fixing position for fixing a thermocouple extending into the blackbody radiation source chamber. There are multiple thermocouple fixing positions, 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 within the blackbody radiation source chamber 11 simultaneously, thereby correcting errors caused by uneven temperature within the chamber.

[0069] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A tool for calibrating a continuous temperature measuring instrument for molten steel, characterized in that: include: A temperature probe fixing system, comprising a calibration temperature measuring tube and a fixing tube; the first end of the calibration temperature measuring tube is configured to extend into the chamber of the blackbody radiation source; the first end of the fixing tube is configured to mount a temperature measuring probe of a continuous molten steel temperature measuring instrument to be tested; the second end of the calibration temperature measuring tube is connected to the second end of the fixing tube; the calibration temperature measuring tube is in communication with the inner cavity of the fixing tube so that the radiation light signal from the blackbody radiation source can reach the temperature measuring probe; The temperature measurement system is used to measure the actual temperature in the blackbody radiation source chamber. This temperature is compared with the temperature measured by the temperature probe to verify the measurement error of the molten steel continuous temperature measuring instrument.

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

3. The tool for calibrating the continuous temperature measuring instrument for molten steel according to claim 2, characterized in that: Flanges are provided on one end of the adjustable tube close to the fixed tube and on the second end of the fixed tube, so that the adjustable tube and the fixed tube are connected via the flanges.

4. The tool for calibrating the continuous temperature measuring instrument for molten steel according to claim 2, characterized in that: The temperature measuring tube for calibration comprises a calibration tube section and an inserting tube section which are connected to each other; the calibration tube section is used to be inserted into the chamber of the blackbody radiation source, and the inserting tube section is used to be plugged into the distance regulating tube.

5. The tool for calibrating the continuous temperature measuring instrument for molten steel according to claim 4, characterized in that: The temperature measurement system includes a digital multimeter, an ice point thermostat and a thermocouple; the thermocouple is arranged in the chamber of the blackbody radiation source, the electrode wire of the thermocouple is connected to the thermocouple compensation wire, and the thermocouple compensation wire is inserted into the ice 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 tool for calibrating the continuous temperature measuring instrument for molten steel according to claim 5, characterized in that: A temperature measuring sleeve is provided on the periphery of the calibration tube section, and a thermocouple fixing hole is provided in the temperature measuring sleeve for fixing a thermocouple extending into the blackbody radiation source chamber.

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

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

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

10. The tool for calibrating a continuous molten 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 distance adjusting tube for calibration.

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