A device and method for measuring the temperature of molten aluminum at a casting nozzle

Abstract

The invention provides a device and method for measuring the temperature of molten aluminum liquid at a casting port, and relates to the technical field of molten metal liquid temperature measuring devices. The device for measuring the temperature of molten aluminum liquid at a casting port comprises an infrared temperature measuring module, a data control center and a temperature calibration platform, wherein the data control center is electrically connected to the infrared temperature measuring module; the temperature calibration platform is electrically connected to the data control center, the temperature calibration platform comprises a metal block, an insulating ceramic sheet, a resistance wire heating device and a pre-embedded thermocouple, the resistance wire heating device is fixedly arranged on the insulating ceramic sheet, the insulating ceramic sheet is connected to the metal block, and the tip of the pre-embedded thermocouple is embedded in the metal block and close to the upper surface of the metal block; the device for measuring the temperature of molten aluminum liquid at a casting port of the invention meets the industrial-grade high-precision and high-reliability temperature measurement requirements through the cooperation of the infrared temperature measuring module, the data control center and the temperature calibration platform, and improves the production quality and efficiency of the product.

Description

Technical Field

[0001] The invention relates to the technical field of molten metal liquid temperature measuring devices, and in particular to a device and method for measuring the temperature of molten aluminum liquid at a casting nozzle. Background Art

[0002] In the casting process of the aluminum alloy metallurgical industry, the temperature control of molten metal is a key link to ensure the quality of castings, avoid defects, optimize energy utilization and improve production efficiency. Traditionally, the measurement of this key parameter mainly relies on thermocouple immersion temperature measurement technology, which achieves fast, direct and relatively accurate temperature measurement by directly inserting thermocouples into molten metal. However, with the continuous progress of industrial production and the increasing requirements for product quality, the limitations of thermocouple immersion temperature measurement have gradually emerged and become an important factor restricting production efficiency and cost control. First, the direct contact between thermocouples and molten metal leads to significant durability problems. From a cost-effectiveness perspective, the frequent replacement of thermocouples not only increases material costs, but also reduces the overall efficiency of the production line due to downtime for replacement. Secondly, the direct contact between thermocouples and aluminum liquid may cause aluminum liquid contamination, surface oxide damage, oxide adhesion to thermocouples and other problems. In order to overcome the above shortcomings, the industry began to explore non-contact temperature measurement technology, among which infrared temperature measurement technology has attracted much attention due to its advantages such as no physical contact and fast response speed.

[0003] However, there are still many shortcomings in directly applying infrared temperature measurement technology to the monitoring of molten metal temperature. The strong reflective properties of the molten metal surface and the presence of oxide scale make it difficult to accurately capture infrared radiation. In addition, the complex and changeable environmental factors at the casting site, such as high-temperature smoke, steam, and airflow disturbances, will have a serious impact on the accuracy and stability of infrared temperature measurement. These factors together limit the widespread application of infrared temperature measurement technology in molten metal temperature monitoring, and it is difficult to meet the industrial-grade high-precision and high-reliability temperature measurement needs. Summary of the invention

[0004] Based on this, in order to solve the problem that the existing molten metal temperature measurement technology is difficult to meet the industrial-grade high-precision and high-reliability temperature measurement requirements, one of the purposes of the present invention is to provide a device for measuring the temperature of molten aluminum at a casting nozzle, and its specific technical solution is as follows:

[0005] A device for measuring the temperature of molten aluminum liquid at a casting port, comprising an infrared temperature measurement module, a data control center and a temperature calibration platform, wherein the data control center is electrically connected to the infrared temperature measurement module; the temperature calibration platform is electrically connected to the data control center, and the temperature calibration platform comprises a metal block, an insulating ceramic sheet, a resistance wire heating device and a pre-buried thermocouple, wherein the resistance wire heating device is fixedly arranged on the insulating ceramic sheet, the insulating ceramic sheet is connected to the metal block, the tip of the pre-buried thermocouple is embedded in the metal block and close to the upper surface of the metal block, and the pre-buried thermocouple and the resistance wire heating device are electrically connected to the data control center respectively.

[0006] Furthermore, the infrared temperature measurement module includes a plurality of independent infrared measurement channels, each of which is equipped with an infrared sensor for measuring the temperature of the molten aluminum liquid and the temperature calibration platform respectively.

[0007] Furthermore, the data control center is electrically connected to a temperature control meter, and the temperature control meter is electrically connected to the embedded thermocouple. The data control center reads the temperature measured by the embedded thermocouple through the temperature control meter, and automatically adjusts the heating power of the resistance wire heating device based on the comparison between the temperature measured by the embedded thermocouple and the preset temperature range, so as to maintain the temperature of the temperature calibration platform within the preset temperature range.

[0008] Furthermore, the data control center includes several microprocessors, several storage devices and several user interfaces, each microprocessor is used to perform the calculation of the molten aluminum liquid temperature, each storage device is used to record temperature data and calculation results, and each user interface is used to display relevant temperature information and provide user interaction functions.

[0009] Furthermore, the temperature tolerance of the temperature calibration platform is greater than or equal to 850°C.

[0010] Furthermore, the infrared temperature measurement module is arranged on a mobile device, and the mobile device includes a carrying platform, a connecting rod and a control motor. The carrying platform is connected to one end of the connecting rod, and the end of the connecting rod away from the carrying platform is connected to the control motor. The control motor controls the displacement and rotation of the connecting rod, and the infrared temperature measurement module is movably connected to the carrying platform.

[0011] Furthermore, the carrying platform is connected to a cooling water circuit for lowering the temperature of the infrared temperature measurement module.

[0012] Another object of the present invention is to provide a method for measuring the temperature of molten aluminum at a casting nozzle, which is applied to the device for measuring the temperature of molten aluminum at a casting nozzle as described above, and comprises the following steps:

[0013] Providing the temperature calibration platform;

[0014] Placing the temperature calibration platform at the casting port, ensuring that the distance between the temperature calibration platform and the molten aluminum liquid is less than or equal to 1000 mm;

[0015] Preheating the temperature calibration platform by the resistance wire heating device until the temperature is higher than the temperature of the molten aluminum liquid, and the preheating temperature is less than or equal to 80° C.

[0016] Use the infrared temperature measurement module to simultaneously measure the temperature T1 of the molten aluminum liquid and the temperature T2 of the temperature calibration platform;

[0017] The embedded thermocouple and the resistance wire heating device are used to monitor and adjust the temperature of the temperature calibration platform in real time to keep it within the preset temperature range. The temperature read by the embedded thermocouple by the data control center is recorded as T P ;

[0018] Calculate T Al =T P -T2+T1, T Al That is the exact temperature of the molten aluminum at the pouring nozzle.

[0019] Furthermore, the infrared temperature measurement module includes two independent infrared measurement channels, one for measuring the temperature T1 of the molten aluminum liquid, and the other for measuring the temperature T2 of the temperature calibration platform.

[0020] Furthermore, the data control center includes several microprocessors, several storage devices and several user interfaces, which are used to receive, process and store the temperature data TP from the embedded thermocouple and the temperature data T1, T2 from the infrared temperature measurement module, and calculate, display and record the actual temperature T Al .

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. High-precision measurement: The temperature calibration platform, as the temperature calibration point during temperature measurement, can effectively offset the interference of most environmental factors on infrared temperature measurement. Through the cooperation of infrared temperature measurement module, data control center and temperature calibration platform, it can meet the industrial-grade high-precision and high-reliability temperature measurement needs.

[0023] 2. Non-contact measurement: The measuring device does not contact the molten aluminum liquid, avoiding the component loss and metal contamination problems in the traditional contact temperature measurement method, extending the service life of the equipment, reducing production costs and improving production efficiency.

[0024] 3. Easy operation and economy: simple structure, easy installation and maintenance, and high degree of automation.

[0025] 4. Wide application potential: It is not only suitable for the casting process of aluminum, but can also be extended to the temperature control of the melting process of other metals, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention may be further understood from the following description in conjunction with the accompanying drawings, in which the components are not necessarily drawn to scale, but emphasis is placed on illustrating the principles of the embodiments, and in different views, the same reference numerals designate corresponding parts.

[0027] Figure 1 It is a schematic structural diagram of a device for measuring the temperature of molten aluminum liquid at a casting port according to the present invention;

[0028] Figure 2 It is a schematic diagram of the connection relationship between the data control center and the temperature calibration platform of the present invention;

[0029] Figure 3 is a schematic structural diagram of the mobile device of the present invention;

[0030] Figure 4 It is a schematic diagram of the steps of the method for measuring the temperature of molten aluminum liquid at a casting port according to the present invention;

[0031] Figure 5 is a flow chart of the detection method of Example 1 described in the present invention;

[0032] Figure 6 is a temperature recording data diagram of Example 1 of the present invention;

[0033] Figure 7 It is the data control center UI interface of embodiment 2 described in the present invention;

[0034] Figure 8 This is a temperature recording data diagram of Example 2 of the present invention;

[0035] Fig. 9 is a temperature recording data diagram of Example 3 of the present invention;

[0036] Fig.10 This is a diagram illustrating the value of infrared temperature measurement using mesh plane projection according to Embodiment 4 of the present invention;

[0037] Fig.11 This is a temperature recording data diagram of Example 4 of the present invention;

[0038] Fig.12 It is a comparison chart of the temperature measurement results of Comparative Example 1 of the present invention;

[0039] Fig.13 It is a comparison chart of the temperature measurement results of Comparative Example 2 described in the present invention.

[0040] Description of reference numerals:

[0041] 1. Infrared temperature measurement module; 11. Infrared sensor; 2. Data control center; 21. Microprocessor; 22. Storage device; 23. User interface; 3. Temperature calibration platform; 31. Metal block; 32. Insulating ceramic sheet; 33. Resistance wire heating device; 34. Embedded thermocouple; 4. Temperature control meter; 5. Moving device; 51. Carrying platform; 52. Connecting rod; 53. Control motor; 54. Cooling water channel; 6. Casting mouth. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with its embodiments. It should be understood that the specific implementation methods described herein are only used to explain the present invention and do not limit the adsorption scope of the present invention.

[0043] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which the present invention belongs. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0045] The “first” and “second” mentioned in the present invention do not represent specific quantities and orders, but are merely used to distinguish names.

[0046] like Figure 1-Figure 2As shown, a device for measuring the temperature of molten aluminum liquid at a casting port in an embodiment of the present invention comprises an infrared temperature measurement module 1, a data control center 2 and a temperature calibration platform 3, wherein the data control center 2 is electrically connected to the infrared temperature measurement module 1; the temperature calibration platform 3 is electrically connected to the data control center 2, and the infrared temperature measurement module 1 is provided to synchronously measure the temperature of the molten aluminum liquid and the temperature calibration platform 3; the data control center 2 is provided to control the temperature of the temperature calibration platform 3 and calculate the actual temperature data of the molten aluminum liquid; the temperature calibration platform 3 is provided to effectively eliminate the interference of environmental factors when measuring the temperature of the molten aluminum liquid, and improve the measurement accuracy. The provision of the temperature calibration platform 3 can provide an accurate temperature calibration point for the infrared temperature measurement module 1, and the temperature calibration platform 3 comprises a metal block 31, an insulating ceramic sheet 32, a resistance wire heating device 33 and a pre-buried thermocouple 34, and the resistance wire heating device 33 is fixedly provided on the insulating ceramic sheet 32. The heating power is adjustable, the insulating ceramic sheet 32 ​​is connected to the metal block 31, and the insulating ceramic sheet 32 ​​is mainly connected to the high-temperature resistant metal block 31 and the resistance wire heating device 33, and will not cause the resistance wire to short-circuit; the tip of the embedded thermocouple 34 is embedded in the metal block 31 and close to the upper surface of the metal block 31, and can be at the same temperature as the metal block 31. The embedded thermocouple 34 and the resistance wire heating device 33 are electrically connected to the data control center 2 respectively; the temperature calibration platform 3 works stably in a high-temperature environment and does not need to be in direct contact with the molten aluminum liquid during operation. In addition, in this embodiment, the metal block 31 is made of high-temperature resistant materials, such as molybdenum alloy, tungsten alloy, nickel-based high-temperature alloy, single crystal superalloy, nickel-chromium alloy, titanium-beryllium alloy, etc. These materials have excellent oxidation resistance and thermal conductivity, uniform temperature, and are easily read by the infrared temperature measurement module 1. Of course, the specific material selection of the metal block 31 can be designed differently according to different needs.

[0047] As a preferred embodiment of the present invention, it may also have the following additional technical features: the infrared temperature measurement module 1 includes several independent infrared measurement channels, each of which is equipped with an infrared sensor 11 for measuring the temperature of the molten aluminum liquid and the temperature calibration platform 3 respectively. At least two independent infrared measurement channels are used to measure the temperature of the molten aluminum liquid and the temperature calibration platform 3 respectively. The synchronous measurement can capture the temperature difference between the molten metal and the calibration platform in real time, so as to obtain the actual temperature of the molten aluminum liquid by calculation.

[0048] As a preferred embodiment of the present invention, it may also have the following additional technical features: a temperature control meter 4 is provided on the data control center 2, and the temperature control meter 4 is electrically connected to the embedded thermocouple 34. The data control center 2 reads the temperature measured by the embedded thermocouple 34 through the temperature control meter 4, and automatically adjusts the heating power of the resistance wire heating device 33 according to the comparison between the temperature measured by the embedded thermocouple 34 and the preset temperature range, so as to maintain the temperature of the temperature calibration platform 3 within the preset temperature range. The temperature of the temperature calibration platform 3 is monitored in real time by the embedded thermocouple 34, and is directly connected to the temperature control meter 4, so as to form a closed-loop temperature control system with the data control center 2 and the resistance wire heating device 33, and can automatically adjust the heating power according to the real-time temperature data of the embedded thermocouple 34, so as to ensure that the temperature of the temperature calibration platform 3 is always kept within the preset range, thereby improving the measurement accuracy.

[0049] As a preferred embodiment of the present invention, it may also have the following additional technical features: the data control center 2 includes a plurality of microprocessors 21, a plurality of storage devices 22 and a plurality of user interfaces 23, each microprocessor 21 is used to perform the calculation of the temperature of the molten aluminum liquid, each storage device is used to record the temperature data and the calculation results, and each user interface 23 is used to display the relevant temperature information and provide user interaction functions, thereby enhancing the convenience and practicality of user operation.

[0050] As a preferred embodiment of the present invention, it may also have the following additional technical features: the temperature-resistant temperature of the temperature calibration platform 3 is greater than or equal to 850°C, and the structure is kept stable, and the temperature calibration platform 3 is also equipped with necessary fixing devices and matching cables.

[0051] See also Figure 3 As a preferred embodiment of the present invention, it may also have the following additional technical features: in order to make the infrared temperature measurement module 1 face the molten aluminum liquid and the temperature calibration platform 3, the infrared temperature measurement module 1 is arranged on the mobile device 5, the mobile device 5 includes a bearing platform 51, a connecting rod 52 and a control motor 53, the bearing platform 51 is connected to one end of the connecting rod 52, and the end of the connecting rod 52 away from the bearing platform 51 is connected to the control motor 53, the control motor 53 controls the displacement and rotation of the connecting rod 52, and the position and angle of the infrared temperature measurement module 1 can be flexibly adjusted to ensure that it faces the molten aluminum liquid and the temperature calibration platform 3; the infrared temperature measurement module 1 is movably connected to the bearing platform 51, and for the consideration of accurate reading and stable operation, the number of infrared sensors 11 can also be increased, and the accurate temperature is calculated by removing abnormal values ​​and taking the average value.

[0052] As a preferred embodiment of the present invention, it may also have the following additional technical features: the supporting platform 51 is connected to a cooling water circuit 54 for lowering the temperature of the infrared temperature measurement module 1. Heat is dissipated through the cooling water circuit 54, which can effectively control the working temperature of the infrared temperature measurement module 1, maintain its stable performance, and extend its service life; of course, in other embodiments, the working temperature of the infrared temperature measurement module 1 can be controlled by air cooling or a circulating water cooling device.

[0053] See also Figure 4 This embodiment also provides a method for measuring the temperature of molten aluminum at a casting port, which is applied to the device for measuring the temperature of molten aluminum at a casting port as described above, and comprises the following steps:

[0054] Provide a temperature calibration platform 3;

[0055] Place the temperature calibration platform 3 at the casting port 6, and ensure that the distance between the temperature calibration platform 3 and the molten aluminum liquid is less than or equal to 1000 mm;

[0056] Preheating the temperature calibration platform 3 by the resistance wire heating device 33 until it is higher than the temperature of the molten aluminum liquid, and the preheating temperature is less than or equal to 80° C., in order to avoid the platform temperature being too low and introducing additional heat exchange errors, while maintaining it within a temperature range that will not significantly affect the molten aluminum liquid;

[0057] The infrared temperature measurement module 1 is used to simultaneously measure the temperature T1 of the molten aluminum liquid and the temperature T2 of the temperature calibration platform 3. Since the infrared temperature measurement module 1 may be interfered by reflection, smoke and other factors in a complex environment, there may be errors in directly measuring the temperature T1 of the molten aluminum liquid;

[0058] The embedded thermocouple 34 and the resistance wire heating device 33 are used to monitor and adjust the temperature of the temperature calibration platform 3 in real time to keep it within the preset temperature range. The temperature read by the embedded thermocouple 34 at the data control center 2 is recorded as T P ;

[0059] Calculate T Al =T P -T2+T1, T Al That is the exact temperature of the molten aluminum at the casting port 6.

[0060] The accurate temperature T read by the embedded thermocouple 34 P and the platform temperature T2 measured by the infrared temperature measurement module 1, by calculating T Al =T P -T2+T1 to get the actual temperature T of the molten aluminum Al Since the temperature calibration platform 3 and the molten aluminum are in a similar thermal environment, and the temperature of the temperature calibration platform 3 is T PIt is accurately measured by the high-precision embedded thermocouple 34, so the infrared measurement temperature T2 on the surface of the temperature calibration platform 3 can be compared with the actual temperature T2 of the embedded thermocouple 34. P To correct the error that may occur when the infrared temperature measurement module 1 measures the molten aluminum liquid, and finally, this correction amount is applied to the infrared measurement temperature T1 of the molten aluminum liquid, so as to obtain a more accurate molten aluminum liquid temperature T Al .

[0061] As a preferred embodiment of the present invention, it may also have the following additional technical features: the infrared temperature measurement module 1 includes two independent infrared measurement channels, one for measuring the temperature T1 of the molten aluminum liquid, and the other for measuring the temperature T2 of the temperature calibration platform 3.

[0062] As a preferred embodiment of the present invention, it may also have the following additional technical features: the data control center 2 includes a plurality of microprocessors 21, a plurality of storage devices 22 and a plurality of user interfaces 23, which are used to receive, process and store the temperature data T from the embedded thermocouples 34. P and the temperature data T1, T2 of the infrared temperature measurement module 1, as well as calculating, displaying and recording the actual temperature T of the molten aluminum liquid Al .

[0063] The embodiments of the present invention will be described in detail below with reference to specific examples.

[0064] Example 1

[0065] See also Figure 5-Figure 6This embodiment describes a specific application scenario: 6063 aluminum alloy casting temperature detection. When the measurement starts, the temperature control center is started, the product information of this measurement is logged in and entered, and then the temperature calibration platform 3 is controlled to move to the upper side of the casting port 6 and about 800mm away from the molten aluminum liquid. The set temperature key values ​​are input in the data control center 2, including the expected casting temperature of 730℃, the temperature calibration platform 3 is set to 800℃, and the set temperature fluctuation range is ±20℃, that is, 780℃-820℃. After waiting for about 10 minutes, the resistance wire heating device 33 is heated to about 800℃ and remains stable. The infrared temperature measurement module 1 is moved to the measurement position. Position, rotate three infrared sensors 11 to align them with the molten aluminum liquid at the casting port 6, rotate the remaining three infrared sensors 11 to align them with the upper surface of the temperature calibration platform 3, start reading, take the average value of the three infrared sensors 11 as the infrared temperature measurement temperature, set the reading frequency to 2 times / second, the measurement accuracy to 0.1°C, and record continuously for 10 minutes; after completing the measurement, turn off the resistance wire heating device 33 and the temperature control meter 4, remove the infrared temperature measurement module 1 and turn it off, remove the temperature calibration platform 3 and turn it off, log out of the system or standby; in this embodiment, the metal block 31 is made of nickel-based alloy, and the heating resistance wire selects a 100V-1000W DC resistance wire.

[0066] From the analysis of the data, it can be seen that the temperature fluctuation range of the temperature calibration platform 3 is between 797.0℃-805.7℃, which is relatively stable, and the temperature control system operates well; the infrared sensor 11 measures the temperature range of the casting mouth 6 to be between 718.7℃-740.5℃, and the infrared sensor 11 measures the temperature range of the temperature calibration platform 3 to be between 790.1℃-816.4℃, with large fluctuations, and the overall fluctuation trends are similar, which may be affected by the smoke or heat waves on site. Finally, it is calculated that the actual temperature range of the casting mouth 6 is between 726.0℃-735.6℃, with small fluctuations, and an overall upward trend.

[0067] Example 2

[0068] See also Figure 7-Figure 8This embodiment describes a specific application scenario: A380 aluminum alloy casting temperature detection, move the temperature calibration platform 3 to the upper side of the casting port 6 and about 750mm from the molten aluminum liquid, enter the set temperature key values ​​in the data control center 2, including the expected casting temperature of 710℃, the temperature calibration platform 3 set to 790℃, and the set temperature fluctuation range is ±15℃, that is, 775℃-805℃, wait for about 15 minutes, the resistance wire heating device 33 heats up to the set temperature of about 790℃ and keeps stable, move the infrared temperature measurement module 1 to the measurement position, rotate the two infrared sensors The infrared sensor 11 is aligned with the molten aluminum liquid at the casting port 6, and the other two infrared sensors 11 are rotated to align with the upper surface of the temperature calibration platform 3; start reading, take the average value of the two infrared sensors 11 as the infrared temperature measurement temperature, set the reading frequency to 1 time / second, the measurement accuracy to 1°C, and record continuously for 8 minutes; after completing the measurement, turn off the resistance wire heating device 33 and the temperature control meter 4, remove the infrared temperature measurement module 1 and turn it off, remove the temperature calibration platform 3 and turn it off; in this embodiment, the high temperature resistant metal block 31 is made of molybdenum alloy, and the heating resistance wire is selected as 220V-1200W AC resistance wire.

[0069] From the analysis data, it can be seen that the temperature fluctuation range of the temperature calibration platform 3 is between 784℃-794℃, the temperature control system operates well, the infrared sensor 11 measures the temperature range of the casting port 6 to be between 710℃-728℃, and the infrared sensor 11 measures the temperature range of the temperature calibration platform 3 to be between 781℃-812℃. It can be seen that the temperature directly measured by the infrared sensor 11 has large fluctuations. The final calculated actual temperature range of the casting port 6 is between 709℃-714℃, with small fluctuations, and the overall trend is to first decrease and then stabilize.

[0070] Example 3

[0071] See also Fig. 9This embodiment describes a specific application scenario: A360 aluminum alloy casting temperature detection, the temperature calibration platform 3 is moved to the upper side of the casting port 6 and about 900mm away from the molten aluminum liquid, and the set temperature key values ​​are input into the data control center 2, including the expected casting temperature of 720℃, the temperature calibration platform 3 is set to 780℃, and the set temperature fluctuation range is ±20℃, that is, 760℃-800℃. After waiting for about 10 minutes, the resistance wire heating device 33 is heated to the set temperature of about 780℃ and remains stable, and the infrared temperature measurement module 1 is moved to the measurement position. Manually rotate one infrared sensor 11 to align it with the molten aluminum liquid at the casting port 6, rotate the other infrared sensor 11 to align it with the upper surface of the temperature calibration platform 3, start reading, the reading frequency is 2 times / second, the measurement accuracy is 0.1°C, and the continuous recording is 10 minutes. After the measurement is completed, turn off the resistance wire heating device 33 and the temperature control meter 4, rotate the infrared temperature measurement module 1 back to its original position, move it away after turning it off, and move the temperature calibration platform 3 away and turn it off; in this embodiment, the metal block 31 is made of tungsten alloy, and the heating resistance wire is selected as 220V-900W AC resistance wire.

[0072] From the analysis of the data, it can be seen that the temperature fluctuation range of the temperature calibration platform 3 is between 775.4℃-788.4℃, the temperature control system operates well, the infrared sensor 11 measures the temperature range of the casting mouth 6 to be between 708.3℃-748.2℃, and the infrared sensor 11 measures the temperature range of the temperature calibration platform 3 to be between 762.4℃-817.7℃. It can be seen that the temperature directly measured by the infrared sensor 11 has large fluctuations. The final calculated actual temperature range of the casting mouth 6 is between 717.2℃-723.3℃, ​​with small fluctuations, and the overall trend is slightly downward after being stable in the early stage.

[0073] Example 4

[0074] See also Figure 10-11, This embodiment describes a specific application scenario: 7075 aluminum alloy casting temperature detection, this embodiment adopts mesh plane projection infrared temperature measurement, which is different from the method of taking the average value of a limited number of infrared temperature measurement channels. This embodiment adopts a mesh plane projection infrared temperature measurement probe to directly read the temperature value of the entire field of view; move the temperature calibration platform 3 to the upper side of the casting port 6 and about 600mm from the molten aluminum liquid, enter the set temperature key value in the data control center 2, including the expected casting temperature of 705℃, the temperature calibration platform 3 is set to 765℃, and the set temperature fluctuation range is ±15℃, that is, 750℃-780℃, wait for about 10 minutes, and the resistance wire heating device 33 is heated to the set temperature of 765 ℃ and keep it stable, move the infrared temperature measuring module 1 to the measuring position, rotate a mesh plane projection infrared temperature measuring probe to align the mesh plane projection infrared temperature measuring probe with the molten aluminum liquid at the casting port 6, and rotate another mesh plane projection infrared temperature measuring probe to align it with the upper surface of the temperature calibration platform 3; start reading, the reading frequency is 1 time / second, the measurement accuracy is 0.1℃, and the continuous recording is 12min; after completing the measurement, turn off the resistance wire heating device 33 and the temperature control meter 4, remove the infrared temperature measuring module 1 and turn it off, remove the temperature calibration platform 3 and turn it off, log out of the system or standby; in this embodiment, the metal block 31 material is made of nickel-based alloy, and the heating resistance wire selects 110V-1200W AC resistance wire.

[0075] From the analysis data, it can be seen that the temperature fluctuation range of the temperature calibration platform 3 is between 761.5℃-773.2℃, the temperature control system operates well, the infrared sensor 11 measures the temperature range of the casting mouth 6 to be between 702.4℃-721.8℃, and the infrared sensor 11 measures the temperature range of the temperature calibration platform 3 to be between 768.6℃-782.5℃. It can be seen that the temperature directly measured by the infrared sensor 11 has large fluctuations; the final calculated actual temperature range of the casting mouth 6 is between 702.3℃-706.1℃, with small fluctuations.

[0076] Comparative Example 1:

[0077] The only difference is that the device for measuring the temperature of the molten aluminum liquid at the pouring nozzle 6 is replaced by a traditional thermocouple, which is used to compare the service life with the traditional thermocouple measurement method; please refer to Fig.12 The new thermocouple was damaged after about 40 minutes of use, while the device for measuring the temperature of the molten aluminum liquid at the casting mouth used in this embodiment was not affected. By comparing the temperature measurement data, it was found that the two were close, indicating that the measurement accuracy of the device for measuring the temperature of the molten aluminum liquid at the casting mouth used in this embodiment is equivalent to that of the thermocouple contact measurement method.

[0078] Comparative Example 2:

[0079] The only difference is that the traditional infrared temperature measurement method is used instead of the method of measuring the temperature of the molten aluminum liquid at the casting port 6. For comparison of temperature measurement accuracy with the traditional infrared temperature measurement method, please refer to Fig.13 The temperature fluctuation of infrared temperature measurement is between 699.8℃-746.0℃, while the temperature fluctuation measured by the device for measuring the temperature of molten aluminum liquid at the casting port 6 used in this embodiment is between 714.0℃-723.1℃, and the temperature fluctuation of the embedded thermocouple 34 is between 714.1℃-723.0℃. Therefore, compared with infrared temperature measurement, the device for measuring the temperature of molten aluminum liquid at the casting port used in this embodiment can effectively improve the temperature measurement accuracy.

[0080] The device for measuring the temperature of molten aluminum at the casting port in the above-mentioned embodiment has a reasonable structural design and is easy to use. This structure can also be used to implement other equipment with similar usage requirements. In the above-mentioned embodiment, the device for measuring the temperature of molten aluminum at the casting port meets the industrial-grade high-precision and high-reliability temperature measurement requirements through the cooperation of the infrared temperature measurement module 1, the data control center 2 and the temperature calibration platform 3, thereby improving the production quality and efficiency of the product.

[0081] In the description of the above embodiments, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, "several" and "multiple" mean more than one, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" and "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0082] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction between the combinations of these technical features, they should be considered to be within the scope recorded in this specification.

[0083] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A device for measuring the temperature of molten aluminum at a casting port, characterized in that: include: Infrared temperature measurement module; A data control center, the data control center is electrically connected to the infrared temperature measurement module; A temperature calibration platform, the temperature calibration platform is electrically connected to the data control center, the temperature calibration platform comprises a metal block, an insulating ceramic sheet, a resistance wire heating device and a pre-buried thermocouple, the resistance wire heating device is fixedly arranged on the insulating ceramic sheet, the insulating ceramic sheet is connected to the metal block, the tip of the pre-buried thermocouple is embedded in the metal block and close to the upper surface of the metal block, the pre-buried thermocouple and the resistance wire heating device are electrically connected to the data control center respectively; The infrared temperature measurement module includes a mesh plane projection infrared temperature measurement probe, which directly reads the temperature value of the entire field of view. The infrared temperature measurement module is arranged on a mobile device, and the mobile device includes a bearing platform, a connecting rod and a control motor. The bearing platform is connected to one end of the connecting rod, and the end of the connecting rod away from the bearing platform is connected to the control motor. The control motor controls the displacement and rotation of the connecting rod. The infrared temperature measurement module is movably connected to the bearing platform, and the bearing platform is connected to a cooling water circuit for reducing the temperature of the infrared temperature measurement module. The set temperature key values ​​are input into the data control center, including the expected casting temperature and the temperature of the temperature calibration platform. The temperature calibration platform sets the temperature fluctuation range to ±15°C. The resistance wire heating device heats up to the set temperature and keeps it stable. The infrared temperature measurement module is moved to the measuring position, and one of the mesh plane projection infrared temperature measurement probes is rotated to align the mesh plane projection infrared temperature measurement probe with the molten aluminum liquid at the casting port, and the other mesh plane projection infrared temperature measurement probe is rotated to align it with the upper surface of the temperature calibration platform, and reading begins.

2. The device for measuring the temperature of molten aluminum at a casting port according to claim 1, characterized in that: The data control center is electrically connected to a temperature control meter, and the temperature control meter is electrically connected to the embedded thermocouple. The data control center reads the temperature measured by the embedded thermocouple through the temperature control meter, and automatically adjusts the heating power of the resistance wire heating device based on the comparison between the temperature measured by the embedded thermocouple and the preset temperature range, so as to maintain the temperature of the temperature calibration platform within the preset temperature range.

3. The device for measuring the temperature of molten aluminum at a casting port according to claim 1, characterized in that: The data control center includes a plurality of microprocessors, a plurality of storage devices and a plurality of user interfaces, each microprocessor is used to perform the calculation of the temperature of the molten aluminum liquid, each storage device is used to record the temperature data and the calculation results, and each user interface is used to display the relevant temperature information and provide user interaction functions.

4. The device for measuring the temperature of molten aluminum at a casting port according to claim 1, characterized in that: The temperature tolerance of the temperature calibration platform is greater than or equal to 850°C.

5. A method for measuring the temperature of molten aluminum at a casting nozzle, applied to the device for measuring the temperature of molten aluminum at a casting nozzle as claimed in any one of claims 1 to 4, characterized in that: The following steps are involved: Providing the temperature calibration platform; Placing the temperature calibration platform at the casting port, ensuring that the distance between the temperature calibration platform and the molten aluminum liquid is less than or equal to 1000 mm; Preheating the temperature calibration platform by the resistance wire heating device until the temperature is higher than the temperature of the molten aluminum liquid; Use the infrared temperature measurement module to simultaneously measure the temperature T1 of the molten aluminum liquid and the temperature T2 of the temperature calibration platform; The embedded thermocouple and the resistance wire heating device are used to monitor and adjust the temperature of the temperature calibration platform in real time to keep it within the preset temperature range. The temperature read by the embedded thermocouple by the data control center is recorded as T P ; Calculate T Al =T P -T2+T1, T Al That is the exact temperature of the molten aluminum at the casting mouth.

6. The method for measuring the temperature of molten aluminum at a casting port according to claim 5, characterized in that: The data control center includes several microprocessors, several storage devices and several user interfaces, which are used to receive, process and store the temperature data T from the embedded thermocouples. P and the temperature data T1, T2 of the infrared temperature measurement module, and calculate, display and record the actual accurate temperature T of the molten aluminum liquid Al .

Images