Thermocouple device for platinum channel and online repairing method

Abstract

The invention relates to the technical field of glass production, in particular to a thermocouple device for a platinum channel and an online repairing method.The thermocouple device comprises a base and a thermocouple, the base is fixedly installed on the platinum channel, and a heat preservation cavity used for containing the thermocouple is formed between the base and the pipe wall of the platinum channel; the base is provided with an assembling jack and a positioning jack which are communicated with the heat preservation cavity, the diameter of the assembling jack is larger than that of a welding ball head of the thermocouple, the diameter of the positioning jack is smaller than that of the welding ball head of the thermocouple, and a wire passing channel is arranged between the assembling jack and the positioning jack so as to be communicated with the assembling jack and the positioning jack. After a thermocouple which is convenient to replace is inserted into the heat preservation cavity, the thermocouple is moved to the positioning insertion hole from the assembly insertion hole. Through the arrangement of the assembly jack, the positioning jack and the wire passing channel, when an existing thermocouple fails, a new thermocouple can be inserted through the assembly jack and then moved to the positioning jack through the wire passing channel, so that the thermocouple is repaired simply and quickly, and the installation convenience of the thermocouple is improved.

Description

Technical Field

[0001] This invention relates to the field of glass production technology, specifically to a thermocouple device for platinum channels and an online repair method. Background Technology

[0002] Substrate glass is the core material of liquid crystal display devices, directly participating in the display imaging process. During substrate glass production, a platinum channel is used for quality control to clarify, homogenize, and regulate the temperature and flow rate of the molten glass flowing from the furnace. The main part of the platinum channel is a platinum tube, with electrodes connected to both ends. The molten glass is heated by electric current, causing bubbles in the glass to expand and escape, eliminating defects such as bubbles and inclusions, and improving the glass's transparency.

[0003] To precisely control the temperature of the molten glass within the platinum channel, a number of thermocouples are typically mounted on the outer wall of the platinum tube. The temperature of the platinum tube wall is detected by bringing the welded tip of the thermocouple close to the tube. However, thermocouples may become unusable due to factors such as expansion from the platinum channel due to temperature rise, the welded tip detaching, or breakage due to high-temperature oxidation. In such cases, replacement is necessary. To protect the thermocouples and improve the accuracy of temperature monitoring, a base with insertion holes for the thermocouples is usually installed on the outside of the platinum tube. To prevent the welded tip from detaching from the insertion hole and affecting temperature detection accuracy, the welded tip is typically larger than the insertion hole. This means that a damaged thermocouple cannot be directly removed from the insertion hole; the base must be removed or re-welded. Furthermore, the base is usually covered with insulation material and a steel structure, making the process cumbersome and inefficient. Replacement is particularly difficult when the thermocouple is damaged at high temperatures within the platinum tube, further impacting temperature monitoring in the platinum channel and the production quality of the glass substrate.

[0004] Existing technologies offer solutions for replacing damaged thermocouples. For example, Chinese patent document CN220351978U discloses a temporary thermocouple installation device for a platinum channel. This device is used to insert an installation tube through the channel wall of the heater brick channel on the outside of the platinum channel. The bottom of the installation tube is in contact with the outside of the platinum channel. A temporary thermocouple is installed on the outside of the platinum channel through the installation tube. By adding a new thermocouple to the area where the thermocouple failed during the heating process of the platinum channel, the temperature of the platinum channel in that area can continue to be monitored.

[0005] However, the above-mentioned device still has certain drawbacks in use: 1. The device requires a heater brick to be installed on the outside of the platinum channel and ensure its airtightness. Then, an installation tube is installed in the gap of the heater brick and filled with refractory material, which involves a large amount of work and high cost; 2. Since the installation tube needs to pass through the heater brick and contact the wall of the platinum tube, it has a certain length. When the thermocouple is inserted into or out of the installation tube, it may get stuck due to thermal expansion or oxidation. In this case, replacing the thermocouple requires removing the heater brick, which is complicated and inconvenient to use.

[0006] Therefore, a thermocouple device is needed that can facilitate the convenient replacement of failed thermocouples while reducing costs. Summary of the Invention

[0007] This invention provides a thermocouple device for a platinum channel to solve the technical problems of high cost and inconvenience of use of existing thermocouple devices; the purpose of this invention is also to provide a method for repairing failed thermocouples using the above-mentioned thermocouple device.

[0008] To solve the above problems, the present invention provides a platinum channel thermocouple device with the following technical solution: A thermocouple device for a platinum channel includes a base for mounting on the outer wall of the platinum channel and a thermocouple. The base has a pre-installation hole for mounting the thermocouple. The base also has an insulated cavity on one side of the platinum channel for placing the thermocouple. The base has an assembly socket and a positioning socket communicating with the insulated cavity. The diameter of the assembly socket is larger than the diameter of the thermocouple's welding ball tip, allowing the welding ball tip to be inserted into the insulated cavity. The diameter of the positioning socket is smaller than the diameter of the thermocouple's welding ball tip to prevent the welding ball tip from detaching from the insulated cavity. A wire passage connects the assembly socket and the positioning socket, facilitating the movement of the thermocouple from the assembly socket to the positioning socket after insertion into the insulated cavity. The positioning socket, the pre-installation hole, and the platinum channel wall are all at the same distance.

[0009] This invention provides a thermocouple device for platinum channels. By incorporating an assembly socket, a positioning socket, and a wire passage on the base, a new thermocouple can be inserted through the assembly socket when an existing thermocouple fails. It can then be moved to the positioning socket via the wire passage, completing the thermocouple repair quickly and easily, thus improving the convenience of thermocouple installation and maintenance. Furthermore, this structure enables rapid thermocouple replacement regardless of whether the platinum channel is in operation, without dismantling the original structure. This ensures the accuracy of glass melt temperature monitoring within the platinum channel and the stability of the platinum channel's process operation. Secondly, this invention has a simple structure and can be reused multiple times after a single installation. Compared to existing technologies, this structure significantly reduces usage and maintenance costs while meeting thermocouple replacement requirements.

[0010] Furthermore, the base has a cover plate with a closed position that closes the assembly socket and the wire passage to prevent external insulation material from entering the insulation cavity. The cover plate also has an open position that opens the assembly socket and the wire passage to facilitate the installation of thermocouples.

[0011] Its beneficial effects are as follows: the cover plate has a dual function. When the cover plate is in the closed position, it can prevent external insulation material from entering the insulation cavity, avoiding interference from the insulation material with the thermocouple measurement environment. At the same time, the cover plate can improve the insulation effect of the insulation cavity and ensure the accuracy of the measurement results. When the cover plate is in the open position, it is convenient for operators to replace thermocouples, improving the efficiency of installation and maintenance.

[0012] Furthermore, the end of the cover plate near the mounting hole is welded to the base. Its material is platinum-rhodium 10 alloy or platinum-rhodium 20 alloy, and its thickness is 0.3-0.5 mm, so as to reduce the bending stiffness of the cover plate and facilitate the opening and closing operation of the cover plate.

[0013] Its beneficial effects are as follows: by using platinum-rhodium 10 alloy or platinum-rhodium 20 alloy to make the cover plate and controlling the thickness to 0.3-0.5 mm, the bending stiffness of the cover plate can be reduced, so that while one end of the cover plate is welded to the base, the other end still has a large range of motion. This can reduce the difficulty for operators to open and close the cover plate while ensuring the stability of the connection between the cover plate and the base. Especially in high temperature environments, the cover plate has better flexibility and plasticity, which further increases the convenience of opening and closing the cover plate.

[0014] Furthermore, the base has a top plate that is inclined relative to the axis of the platinum channel. The assembly socket, positioning socket, and wire passage are all located on the top plate. The distance between the assembly socket and the wall of the platinum channel is greater than the distance between the positioning socket and the wall of the platinum channel, so that when the thermocouple moves from the assembly socket to the positioning socket, its welding ball head gradually approaches the platinum channel.

[0015] Its beneficial effects are as follows: by tilting the top plate of the base and setting the distance between the assembly socket and the platinum channel wall to be greater than the distance between the positioning socket and the platinum channel wall, the thermocouple has more space when it is inserted into the assembly socket, which facilitates the insertion operation of the thermocouple; at the same time, when the thermocouple moves from the assembly socket to the positioning socket, the welding ball can slowly approach the wall of the platinum channel, thereby ensuring the temperature measurement accuracy of the thermocouple.

[0016] Furthermore, the diameter of the assembly socket is 1.5-2 times the diameter of the positioning socket to reduce the difficulty of inserting the welding ball head into the assembly socket.

[0017] Its beneficial effects are as follows: by setting the diameter of the assembly socket to 1.5-2 times that of the positioning socket, the difficulty of inserting the welding ball head of the thermocouple into the assembly socket is reduced, jamming during the insertion process is avoided, and the installation efficiency and ease of installation of the thermocouple are improved.

[0018] Furthermore, the width of the wire passage is not less than the sum of the maximum outer diameters of the two thermocouple wires, and the connection between the wire passage and the assembly socket and positioning socket is an arc-shaped transition to avoid obstruction or damage to the thermocouple when it moves in the wire passage.

[0019] Its beneficial effects are as follows: by limiting the width of the wire passage to no less than the sum of the maximum outer diameters of the two thermocouple wires, it ensures that the thermocouple wires can pass through the wire passage smoothly and avoid jamming. At the same time, the rounded transition at the connection between the wire passage and the assembly socket and positioning socket can avoid damage to the thermocouple wires and also improve the replacement efficiency of the thermocouple.

[0020] Furthermore, the base is made of platinum-rhodium 10 alloy or platinum-rhodium 20 alloy, with a thickness ranging from 0.3 to 1 mm.

[0021] Furthermore, both thermocouple wires of the thermocouple have a high-temperature resistant insulating layer on their outer sides to prevent short circuits, signal interference, or chemical corrosion between the two thermocouple wires or between the thermocouple wires and the external environment.

[0022] Its beneficial effects are as follows: the high-temperature resistant insulation layer effectively prevents short circuits between the two thermocouple wires, ensuring accurate transmission of electrical signals. Simultaneously, it prevents signal interference or chemical corrosion between the thermocouple wires and the external environment, improving the thermocouple's anti-interference capability and corrosion resistance, ensuring the accuracy and stability of temperature measurement, and extending the thermocouple's service life.

[0023] To address the above problems, the present invention provides an online thermocouple repair method using the following technical solution: A method for online thermocouple repair, which utilizes the aforementioned platinum channel thermocouple device, comprises the following steps: S1. If the thermocouple in the pre-installed hole is damaged, first remove the damaged thermocouple; S2. Place the welding ball of the new thermocouple into the assembly socket, and then move it step by step along the wire passage to the positioning socket. S3. Then, power on the installed thermocouple and check the temperature display. If it meets the process requirements, the repair is complete. If not, repeat steps S1-S2.

[0024] The present invention provides an online repair method for thermocouples in a platinum channel. By using the above-mentioned thermocouple device, damaged thermocouples can be quickly replaced during the operation of the platinum channel in a cold state or at a high temperature, without stopping the machine. The steps are simple and direct, which can shorten the replacement time of failed thermocouples and thus effectively improve the temperature monitoring accuracy of the platinum channel.

[0025] Furthermore, step S1 also includes removing the external insulation material and steel structure. In step S3, after completing the wiring of the thermocouple, the insulation material of the thermocouple part is restored. The specific method is as follows: first, cover the surface near the thermocouple welding base with insulation cotton with a thickness of 10-20 mm, then fill the outside of the insulation cotton with alumina powder, and then restore the insulation material and steel structure.

[0026] Its beneficial effects are as follows: by covering the outside of the base near the newly installed thermocouple with insulation cotton and filling it with alumina powder, it can ensure that the thermocouple wire has a relatively large amount of space to move near the positioning socket, avoiding the thermocouple wire being pulled and damaged due to the positional change of the platinum channel caused by expansion, thereby improving the stability of the thermocouple in use. Attached Figure Description

[0027] The above and other objects, features, and advantages of exemplary embodiments of the present invention will become readily apparent upon reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of the invention are illustrated by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein: Figure 1 This invention provides a schematic diagram of the structure of a thermocouple device for a platinum channel. Figure 2 Partial cross-sectional view of a platinum channel thermocouple device provided by the present invention. Figure 1 ; Figure 3 Partial cross-sectional view of a platinum channel thermocouple device provided by the present invention. Figure 2 ; Figure 4 A top view of a platinum channel thermocouple device provided by the present invention; Figure 5 A schematic diagram showing the state of the thermocouple device when the thermocouple is inserted into the assembly socket; Figure 6 This is a schematic diagram of the thermocouple device's state when the thermocouple is moved to the positioning socket.

[0028] Explanation of reference numerals in the attached figures: 1. Base; 11. Assembly socket; 12. Positioning socket; 13. Pre-installation hole; 14. Wire passage; 15. Cover plate; 16. Top plate; 17. Insulation cavity; 2. Thermocouple; 21. Welded ball head; 22. Thermocouple wire; 3. Platinum channel. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Those skilled in the art should understand that the embodiments described below are only some, not all, of the embodiments disclosed. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0030] The principles and spirit of the present invention will be explained in detail below with reference to several representative embodiments.

[0031] Embodiment 1 of a platinum channel thermocouple device provided by the present invention: like Figures 1 to 6 As shown, the present invention provides a thermocouple device for a platinum channel, comprising a base 1 and a thermocouple 2. The thermocouple 2 includes two thermocouple wires 22 and a welded ball head 21. The welded ball head 21 is a spherical welding point formed by welding the ends of the two thermocouple wires 22. The welded ball head 21 reduces heat loss during transfer, thus improving temperature measurement accuracy. To ensure good temperature measurement performance and stability, the thermocouple wires 22 are made of pure platinum or a platinum-rhodium alloy to improve the accuracy of temperature measurement. The base 1 is mounted on the wall of the platinum channel 3 and serves to protect the thermocouple 2.

[0032] The following section will first introduce base 1, such as... Figure 1 , Figure 5 , Figure 6As shown, in this embodiment, the base 1 is a rectangular box structure, with its bottom welded to the platinum channel 3. The base 1 has an insulated cavity 17 on the side near the platinum channel 3 for placing the welded ball head 21 of the thermocouple 2. The platinum channel 3 is a platinum tube used to heat the molten glass, with electrodes connected to both ends for energizing. The base 1 is made of a platinum-rhodium 10 or platinum-rhodium 20 alloy, with a wall thickness ranging from 0.3 to 1 mm. The upper end of the base 1 has a top plate 16 inclined relative to the platinum channel 3. Both the mounting hole 11 and the positioning hole 12 are located on the top plate 16. In the radial direction of the platinum channel 2, the mounting hole 11 is located at the higher part of the top plate 16, and the positioning hole 12 is located at the lower part of the top plate 16. The positioning hole 12 is closer to the tube wall of the platinum channel than the mounting hole 11. Both the assembly socket 11 and the positioning socket 12 are connected to the insulation cavity 17. The assembly socket 11 is used for inserting the welding ball head 21 of the thermocouple 2 into the insulation cavity 17. The positioning socket 12 is the final installation position of the thermocouple and is used for the thermocouple wire 22 to pass through. A wire passage 14 is provided on the top plate 16 between the assembly socket 11 and the positioning socket 12. The wire passage 14 connects the assembly socket 11 and the positioning socket 12 and is used for moving the thermocouple 2 inserted into the assembly socket 11 into the positioning socket 12.

[0033] The upper end of the base 1 also has a pre-installation hole 13 for mounting the initial thermocouple 2, the diameter of which is 2-3.5 mm. During the manufacturing of the platinum channel 3, the thermocouple wires 22 of the thermocouple 2 are first inserted into the pre-installation hole 13. Then, one end of each thermocouple wire 22 inserted into the pre-installation hole 13 is sintered into a spherical shape to form a welded ball head 21. The diameter of the welded ball head 21 is 0.5-1 mm larger than the diameter of the pre-installation hole 13 to prevent the welded ball head 21 from detaching from the base 1. The base 1 is then welded to the wall of the platinum channel 3.

[0034] The diameter of the positioning socket 12 on the base 1 is equal to the diameter of the pre-installation hole 13, and the positioning socket 12 and the pre-installation hole 13 are at the same distance from the tube wall of the platinum channel 3, so as to ensure that when the thermocouple 2 installed in the pre-installation hole 13 is damaged, the temperature measuring distance of the thermocouple 2 installed in the positioning socket 12 is the same as the temperature measuring distance of the initially installed thermocouple 2.

[0035] To facilitate the insertion of the welding ball tip 21 of thermocouple 2, the diameter of the mounting hole 11 on the base 1 is 1.5-2 times the diameter of the positioning hole 12. Furthermore, the distance between the mounting hole 11 and the wall of the platinum channel 3 is greater than the distance between the positioning hole 12 and the wall of the platinum channel. The wire passage 14 extends obliquely from the mounting hole 11 to the positioning hole 12, so that as the welding ball tip 21 of thermocouple 2 moves from the mounting hole 11 to the positioning hole 12, the distance between it and the platinum channel 3 gradually decreases and eventually maintains a fixed distance. This helps ensure the accuracy of temperature measurement by thermocouple 2 and also facilitates the smooth insertion of the welding ball tip 21 into the positioning hole 12. The width of the wire passage 14 is not less than the sum of the diameters of the two thermocouple wires 22, and its connection with the mounting hole 11 and the positioning hole 12 has an arc-shaped transition to avoid damage to the thermocouple wires 22 when passing through the wire passage 14 and to improve the smoothness of the movement operation.

[0036] In addition, such as Figure 1 and Figure 5 As shown, the upper end of the base 1 also has a cover plate 15. The cover plate 15 is a rectangular thin metal plate with a thickness of 0.3-0.5 mm. Its material is the same as that of the base 1. The cover plate 15 is used to close the assembly socket 11, the positioning socket 12, and the wire passage 14. One end of the cover plate 15 near the assembly socket 11 is welded to the base 1, and the other end is a movable end. The cover plate 15 has a closed position to close the assembly socket 11, the positioning socket 12, and the wire passage 14, and an open position for the thermocouple 2 to pass through. Due to its thinness, its movable end is easy to bend, which can meet the requirement that one end is welded to the base 1 while the other end has a large range of motion. This ensures the stability of the connection between the cover plate 15 and the base 1, and also reduces the difficulty for operators to open and close the cover plate 15. Especially in high-temperature environments, the cover plate 15 has better flexibility and plasticity, further increasing the convenience of opening and closing the cover plate 15.

[0037] Furthermore, both thermocouple wires of thermocouple 2 are covered with a high-temperature resistant insulating layer made of ceramic, which effectively prevents short circuits between the two wires and ensures accurate transmission of electrical signals. Simultaneously, it prevents signal interference or chemical corrosion between the thermocouple wires and the external environment, improving the anti-interference capability and corrosion resistance of thermocouple 2, ensuring the accuracy and stability of temperature measurement, and extending the service life of thermocouple 2.

[0038] The operating principle of a platinum channel thermocouple device is summarized below: During the heating or operation of the platinum channel 3, if thermocouple 2 fails (i.e., the thermocouple 2 installed in the pre-installation hole 13 fails), the operator can remove the failed thermocouple 2, insert a new thermocouple 2 into the insulation cavity 17 through the assembly socket 11, and then gradually move the thermocouple 2 into the positioning socket 12 through the wire passage 14, completing the rapid online installation of the thermocouple 2. As the welding ball head 21 moves from the assembly socket 11 to the positioning socket 12, the distance between it and the tube wall of the platinum channel 3 gradually decreases, ensuring the temperature measurement accuracy of the thermocouple 2. Compared with existing technologies, this invention has a simple structure and low cost, and the replacement of the thermocouple 2 can be completed without removing the base 1, effectively improving the repair efficiency and convenience of the failed thermocouple 2.

[0039] Embodiment 2 of a platinum channel thermocouple device provided by the present invention: Its main difference from Example 1 is: In Example 1, the cover plate 15 is welded to the base 1.

[0040] In this embodiment, the cover plate is hinged to the base.

[0041] Example 1 of an online thermocouple repair method provided by the present invention: A method for online thermocouple repair, which utilizes the aforementioned platinum channel thermocouple device, comprises the following steps: S1. When thermocouple 2 is damaged during the heating or operation of platinum channel 3, first remove the insulation material and steel structure on the outside of the failed thermocouple, then use a tool to open the cover plate 15 so that the cover plate 15 is in a vertical state, and then remove the failed thermocouple 2. S2. Place the welding ball head 21 of the new thermocouple 2 into the assembly socket 11, and then move the thermocouple 2 to the positioning socket 12 step by step along the wire passage 14. S3. Bend the movable end of the cover plate 15 according to the position of the positioning socket 12, then flatten the cover plate 15 so that it covers the assembly socket 11 and the wire passage 14. Then connect the installed thermocouple 2 to the power supply and check its temperature display. If the display is normal, the power connection is completed. If the display is abnormal, repeat steps S1-S3.

[0042] S4. Cover the surface near the thermocouple welding base 1 with a 10-20 mm thick layer of heat-insulating cotton that is resistant to 1600 degrees Celsius. Then fill the outside of the heat-insulating cotton with alumina powder. Finally, restore the heat-insulating material and steel structure. Once the process requirements are met, the repair is complete.

[0043] By covering it with insulation cotton and filling it with alumina powder, the thermocouple wire 22 can have a relatively large amount of space to move near the positioning socket 12, which can prevent the thermocouple wire 22 from being pulled and damaged due to the positional change of the platinum channel 3 caused by expansion, and can improve the stability of the thermocouple 2 in use.

[0044] Based on the above description in this specification, those skilled in the art will also understand that the following terms, such as "upper," "lower," "front," "rear," "left," "right," "width," "horizontal," "top," "bottom," "inner," and "outer," which indicate orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings of this specification. They are only for the purpose of facilitating the explanation of the present invention and simplifying the description, and do not explicitly or implicitly suggest that the device or element involved must have the specific orientation, or be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms should not be understood or interpreted as limitations on the present invention.

[0045] In addition, in the description of this specification, "multiple" means at least two, such as two, three or more, etc., unless otherwise expressly and specifically defined.

Claims

1. A thermocouple device for a platinum channel, comprising a base for mounting on the outer wall of the platinum channel and a thermocouple, wherein the base has a pre-installed hole for mounting the thermocouple, and the base has an insulated cavity on one side of the platinum channel for placing the thermocouple, characterized in that, The base has an assembly insertion hole and a positioning insertion hole which are communicated with the heat preservation cavity. The diameter of the assembly insertion hole is larger than the diameter of the welding ball head of the thermocouple, so that the welding ball head is inserted into the heat preservation cavity. The diameter of the positioning insertion hole is smaller than the diameter of the welding ball head of the thermocouple, so that the welding ball head is prevented from being taken out of the heat preservation cavity. The assembly insertion hole and the positioning insertion hole have a wire passing channel, so that the assembly insertion hole and the positioning insertion hole are communicated, and then the thermocouple which is replaced is moved from the assembly insertion hole to the positioning insertion hole after being inserted into the heat preservation cavity. The distance between the positioning insertion hole, the preloading hole and the wall of the platinum channel is consistent.

2. A thermocouple device for a platinum channel as claimed in claim 1, characterized in that The base has a cover plate. The cover plate has a closed position which closes the assembly insertion hole and the wire passing channel, so that the external heat preservation material is prevented from entering the heat preservation cavity. The cover plate also has an open position which opens the assembly insertion hole and the wire passing channel, so that the thermocouple is installed.

3. A thermocouple device for a platinum channel as claimed in claim 2, characterized in that The end of the cover plate which is close to the assembly insertion hole is welded on the base. The material of the cover plate is platinum rhodium 10 alloy or platinum rhodium 20 alloy, and the thickness of the cover plate is 0.3-0.5 mm, so that the bending stiffness of the cover plate is reduced, and then the opening and closing operation of the cover plate is facilitated.

4. A thermocouple device for a platinum tube according to any one of claims 1 to 3, characterized in that The base has a top plate which is arranged obliquely relative to the axis of the platinum channel. The assembly insertion hole, the positioning insertion hole and the wire passing channel are located on the top plate. The distance between the assembly insertion hole and the wall of the platinum channel is larger than the distance between the positioning insertion hole and the wall of the platinum channel, so that the welding ball head of the thermocouple gradually approaches the platinum channel when the thermocouple is moved from the assembly insertion hole to the positioning insertion hole.

5. A thermocouple device for a platinum channel as defined in claim 4, characterized in that The diameter of the assembly insertion hole is 1.5-2 times the diameter of the positioning insertion hole, so that the difficulty of inserting the welding ball head into the assembly insertion hole is reduced.

6. A thermocouple device for a platinum channel as defined in claim 5, characterized in that The width of the wire passing channel is not less than the sum of the maximum outer diameters of the two wires of the thermocouple. The connection between the wire passing channel and the assembly insertion hole and the positioning insertion hole is in the form of a circular arc, so that the thermocouple is prevented from being hindered or damaged when moving in the wire passing channel.

7. A thermocouple device for use in a platinum tube according to claim 4, characterized in that The base is made of platinum rhodium 10 alloy or platinum rhodium 20 alloy, and the thickness of the base is 0.3-1 mm.

8. A thermocouple device for a platinum channel as defined in claim 4, characterized in that The two wires of the thermocouple have high-temperature resistant insulation layers on the outer sides of the two wires, so that short circuit, signal interference or chemical corrosion is prevented from occurring between the two wires or between the wires and the external environment.

9. A method for repairing a thermocouple device for a platinum channel, the method comprising the following steps: S1, when the thermocouple in the preloading hole is damaged, the damaged thermocouple is removed; S2, the welding ball head of a new thermocouple is placed into the assembly insertion hole, and then is moved to the positioning insertion hole along the wire passing channel; S3, the installed thermocouple is powered on, and the temperature display is checked. If the temperature display meets the process requirements, the repair is completed. If the temperature display does not meet the process requirements, the steps S1-S2 are repeated.

10. The method of claim 9, wherein the thermocouple is an online thermocouple. The step S1 further comprises removing the external heat preservation material and the steel structure. After the power-on detection of the thermocouple is completed in the step S3, the heat preservation material around the thermocouple is recovered. The specific method is that: first, the heat preservation cotton with a thickness of 10-20 mm is covered on the surface close to the welding base of the thermocouple, then the alumina powder is filled outside the heat preservation cotton, and then the heat preservation material and the steel structure are recovered.

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