Temperature measuring device for aluminum alloy smelting furnace

Abstract

The application discloses a temperature measuring device for an aluminum alloy smelting furnace, which comprises a heat-conducting part, a first temperature measuring element and a second temperature measuring element used for calibrating the first temperature measuring element, the heat-conducting part is used for keeping contact with a molten metal in a molten pool of the aluminum alloy smelting furnace, and the first temperature measuring element is in contact with the heat-conducting part; and the second temperature measuring element is used for directly contacting with the molten metal. Through the improvement of the temperature measuring device for the aluminum alloy smelting furnace, the accuracy of temperature detection in the aluminum alloy smelting process is improved.

Description

Technical Field

[0001] This application relates to the field of aluminum alloy smelting technology, and more specifically, to a temperature measuring device for an aluminum alloy smelting furnace. Background Technology

[0002] In the aluminum alloy smelting process, accurate and continuous monitoring of the molten aluminum temperature is a crucial technological step for achieving temperature control. The accuracy of temperature control directly affects the smelting quality, compositional uniformity, grain refinement effect, energy efficiency, and the mechanical properties and yield of the final product.

[0003] Therefore, how to accurately detect the temperature during the aluminum alloy smelting process has always been a pursuit of those skilled in the art. Utility Model Content

[0004] The purpose of this invention is to provide a temperature measuring device for an aluminum alloy smelting furnace. By improving the temperature measuring device for the aluminum alloy smelting furnace, the accuracy of temperature detection during the aluminum alloy smelting process is improved.

[0005] To achieve the above objectives, this utility model provides a temperature measuring device for an aluminum alloy smelting furnace, including a temperature-conducting part, a first temperature measuring element, and a second temperature measuring element for calibrating the first temperature measuring element. The temperature-conducting part is used to maintain thermal contact with the molten liquid in the molten pool of the aluminum alloy smelting furnace, the first temperature measuring element is in contact with the temperature-conducting part, and the second temperature measuring element is used to directly contact the molten liquid.

[0006] In this way, the first temperature sensing element can indirectly obtain the temperature of the molten liquid through the temperature-conducting element, achieving continuous real-time temperature measurement. At the same time, the first temperature sensing element does not come into direct contact with the molten liquid, reducing or avoiding damage to the first temperature sensing element; by using the first temperature sensing element and the second temperature sensing element for calibration, the accuracy of temperature detection by the first temperature sensing element is improved.

[0007] Optionally, the heat-conducting part is fixed inside the temperature measuring channel of the aluminum alloy smelting furnace;

[0008] The temperature measuring device for the aluminum alloy smelting furnace also includes a filling part, which is fixed in the gap between the temperature conducting part and the wall of the temperature measuring channel.

[0009] Optionally, the temperature measuring channel penetrates the inner wall of the furnace body to form an inner opening;

[0010] The temperature-conducting part has a temperature-conducting surface, which is located at the inner opening and is flush with the inner wall of the furnace body.

[0011] Optionally, the bottom of the first temperature sensing element is located inside the socket of the temperature-conducting part and abuts against the bottom end of the socket; the vertical distance between the bottom end of the socket and the temperature-conducting surface is between 50mm and 100mm.

[0012] Optionally, the socket extends through the filling portion to form a socket, and the size of the socket in its extending direction is between 800 mm and 1200 mm.

[0013] Optionally, the inner wall of the socket is spaced apart from the side wall of the first temperature sensing element.

[0014] Optionally, the temperature measuring channel penetrates the outer wall of the furnace body to form an outer opening; the temperature measuring device also includes a plug for fixing one end of the first temperature measuring element.

[0015] Optionally, the plug seals the outer opening and presses against the filling part.

[0016] Optionally, the thermally conductive part is made of silicon carbide or silicon nitride.

[0017] Optionally, it also includes a temperature compensation device, with the first temperature sensing element and the second temperature sensing element being electrically connected to the temperature compensation device.

[0018] Other features and advantages of this specification will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of this specification and, together with their description, serve to explain the principles of this specification.

[0020] Figure 1 This is a partial structural schematic diagram of the aluminum alloy smelting furnace in the embodiments of this application.

[0021] Figure label:

[0022] 1-Temperature-conducting part; 11-Temperature-conducting surface; 2-First temperature-sensing element; 3-Filling part; 4-Insertion hole; 5-Plug part; 6-Furnace body; 61-Molten pool; 62-Temperature-sensing channel; 621-Inner port; 622-Outer port. Detailed Implementation

[0023] To achieve the above objectives, such as Figure 1 As shown, this utility model provides a temperature measuring device for an aluminum alloy smelting furnace, including a temperature conducting part 1, a first temperature measuring element 2, and a second temperature measuring element for calibrating the first temperature measuring element 2. The temperature conducting part 1 is used to maintain thermal contact with the molten liquid in the molten pool 61 of the aluminum alloy smelting furnace, the first temperature measuring element 2 is in contact with the temperature conducting part 1, and the second temperature measuring element is in contact with the molten liquid.

[0024] Specifically, the temperature measuring device in the aluminum alloy smelting furnace is used to detect the temperature of the molten aluminum (i.e., the aforementioned melt) inside the furnace. The smelting furnace includes reverberatory furnaces, crucible furnaces, or holding furnaces, etc. The temperature measuring device in this application can be adapted to any furnace 6 in an aluminum alloy smelting production line that requires temperature measurement.

[0025] The heat-conducting part 1 can be directly or indirectly fixed to the inner wall of the smelting furnace and can maintain direct contact with the molten metal, thereby enabling heat conduction. When selecting the material for the heat-conducting part 1, it is necessary to choose a material with good thermal conductivity and corrosion resistance. For example, the heat-conducting part 1 can be made of reaction-sintered silicon carbide, with a main phase content (SiC) of not less than 80%. Silicon nitride can also be selected; no specific limitation is made here. For example, the heat-conducting part 1 made of silicon carbide or silicon nitride has a thermal conductivity of not less than 12 W / (m·K) at an operating temperature of 700℃ to ensure efficient heat conduction. Its compressive strength can be greater than or equal to 145 MPa, possessing excellent mechanical load-bearing capacity. Experiments have shown that the silicon carbide heat-conducting part 1 can withstand more than 50 cycles of rapid thermal change from 1100℃ to water cooling without any cracks, demonstrating excellent thermal shock resistance. After being continuously immersed in molten aluminum at 720℃ for 3000 hours, its corrosion depth was less than 0.05 mm, demonstrating excellent chemical stability.

[0026] The first temperature sensing element 2 and the second temperature sensing element can be thermocouples. The first temperature sensing element 2 is used to obtain the temperature of the heat-conducting part 1. Since the heat-conducting part 1 maintains thermal contact with the molten liquid, the first temperature sensing element 2 can indirectly obtain the current temperature of the molten liquid by collecting the current temperature of the heat-conducting part 1.

[0027] The second temperature sensing element directly contacts the molten metal to measure its temperature. This temperature is used as the calibration temperature. The first temperature sensing element 2, as the main temperature sensing component, can acquire the temperature of the heat-conducting part 1 in real time. The actual temperature of the molten metal is measured using the second temperature sensing element at set time intervals. This measurement is then compared and calibrated with the temperature of the heat-conducting part 1 acquired by the first temperature sensing element 2 at the same time, resulting in a temperature compensation value. Based on this temperature compensation value, the actual temperature of the molten metal can be obtained through the first temperature sensing element 2.

[0028] Temperature compensation can be performed manually or using a temperature compensation device.

[0029] For example, in the case where the temperature measuring device of the aluminum alloy smelting furnace also includes a temperature compensation device, the first temperature measuring element 2 and the second temperature measuring element are electrically connected to the temperature compensation device. Thus, the temperature compensation device can obtain a temperature compensation value based on the temperature values ​​measured by the first temperature measuring element 2 and the second temperature measuring element, and then perform temperature compensation on the temperature obtained by the first temperature measuring element 2.

[0030] In existing technologies, to obtain the temperature of molten metal, intermittent temperature measurement using handheld thermocouples or fixed / movable insertion thermocouples are typically employed. Intermittent handheld thermocouple measurement suffers from the drawback of discontinuous temperature measurement, making it impossible to obtain the molten metal temperature in real time. Fixed / movable insertion thermocouples can achieve a certain degree of continuous real-time temperature measurement, but because the thermocouples are in direct contact with the molten metal, they suffer from short thermocouple lifespan, temperature measurement distortion, and inconvenient maintenance.

[0031] In this way, the first temperature sensing element 2 can indirectly obtain the temperature of the molten liquid through the temperature-conducting element, achieving continuous real-time temperature measurement. At the same time, the first temperature sensing element 2 does not directly contact the molten liquid, reducing or avoiding damage to the first temperature sensing element 2; by using the first temperature sensing element 2 and the second temperature sensing element for calibration, the accuracy of temperature detection by the first temperature sensing element 2 is improved.

[0032] According to some embodiments of this application, the temperature-conducting part 1 is fixed inside the temperature measuring channel 62 of the aluminum alloy smelting furnace; the temperature measuring device of the aluminum alloy smelting furnace further includes: a filling part 3, which is fixed in the gap between the temperature-conducting part 1 and the wall of the temperature measuring channel 62.

[0033] Specifically, the temperature measuring device for the aluminum alloy smelting furnace includes a furnace body 6 with a molten pool 61. The furnace body 6 has a temperature measuring channel 62 that penetrates the furnace body 6, forming an inner opening 621 on the inner wall and an outer opening 622 on the outer wall. The inner opening 621 communicates with the molten pool 61. The structure of the temperature measuring channel 62 does not involve improvements to this application and will not be described in detail here.

[0034] The temperature-conducting part 1 is indirectly fixed within the temperature measuring channel 62 via the filling part 3, and can directly contact the molten metal. During processing, a fixing fixture can be used to fix the temperature-conducting part 1 within the temperature measuring channel 62. After covering the inner opening 621, filling material is poured into the inner opening 621 through the outer opening 622. The filling material can be a fast-drying material to reduce furnace downtime. After the filling material solidifies, the fixing fixture is removed, and the inner opening 621 is no longer covered.

[0035] At this time, the solidified filling material can fix the temperature-conducting part 1 in the set position of the temperature measuring channel 62. At the same time, the filling part 3 and the temperature-conducting part 1 can also fill the temperature measuring channel 62 together, reducing or avoiding the leakage of molten liquid from the temperature measuring channel 62 and improving the safety of smelting.

[0036] The filling part 3 can be selected from chemically bonded castables based on bauxite or aluminum-containing refractory castables, such as ALULOC-88SR or FOSINCAST-90 castables, without specific limitations.

[0037] The thermal expansion systems of the temperature-conducting part 1 and the filling part 3 can be close to each other, thereby enabling a stable filling of the temperature measuring channel 62.

[0038] According to some other embodiments of this application, the temperature-conducting part 1 has a temperature-conducting surface 11, which is disposed at the inner opening 621 and is flush with the inner wall of the furnace body 6.

[0039] Specifically, the heat-conducting surface 11 can be located on the surface where the inner opening 621 is located, thus being flush with the inner wall of the furnace body 6. This can reduce or prevent molten metal from entering the temperature measuring channel 62 and forming deposits, thereby ensuring the heat conduction effect between the heat-conducting component and the molten metal.

[0040] According to some other embodiments of this application, the bottom of the first temperature sensing element 2 is located inside the socket 4 of the temperature conducting part 1 and abuts against the bottom end of the socket 4; the vertical distance between the bottom end of the socket 4 and the temperature conducting surface 11 is between 50mm and 100mm.

[0041] Specifically, in order to accommodate the first temperature sensing element 2, a socket 4 is provided. The bottom end of the socket 4 is a closed end, located inside the temperature conducting part 1. The socket 4 extends through the temperature conducting part 1 to penetrate the filling part 3, so as to form an insertion port on the end face of the filling part 3 facing the outer opening 622.

[0042] The first temperature sensing element 2 can be a rod-shaped component, which is inserted into the socket 4 through a connector. The temperature sensing end of the first temperature sensing element 2 is located at the bottom of the first temperature sensing element 2, and the bottom of the first temperature sensing element 2 abuts against the bottom of the socket 4 to collect the temperature of the temperature conducting part 1.

[0043] The vertical distance between the bottom of the socket 4 and the thermally conductive surface 11 refers to the distance between the bottom of the socket 4 and the thermally conductive surface 11 on the surface where the bottom of the socket 4 is located.

[0044] The distance between the bottom of the socket 4 and the temperature-conducting surface 11 is between 50mm and 100mm, including the point value. Within this range, the accuracy of temperature acquisition of the temperature-conducting part 1 by the first temperature sensing element 2 can be improved.

[0045] According to other embodiments of this application, as mentioned above, the insertion hole 4 extends through the filling portion 3 to form a socket. The dimension of the insertion hole 4 in its extending direction is between 800 mm and 1200 mm.

[0046] Specifically, the insertion hole 4 extends at an angle relative to the central axis of the furnace body 6. The dimension of the insertion hole 4 in its extending direction is the dimension into which the first temperature sensing element 2 extends into the filling part 3 and the temperature conducting part 1. Within this dimension range, the temperature measurement accuracy of the first temperature sensing element 2 can be improved.

[0047] According to some other embodiments of this application, the inner wall of the socket 4 is spaced apart from the side wall of the first temperature sensing element 2.

[0048] Specifically, the inner diameter of the socket 4 can be set according to the radial dimension of the first temperature sensing element 2, ensuring that the inner diameter of the socket 4 is larger than the radial dimension of the first temperature sensing element 2. The first temperature sensing element 2 can be held at a position spaced apart from the inner wall of the socket 4, thereby preventing damage to the first temperature sensing element 2.

[0049] To hold the first temperature sensing element 2 in a set position, as before, the temperature sensing channel 62 can penetrate the outer wall of the furnace body 6 to form an outer opening 622. The temperature sensing device also includes a plug 5, which is used to fix one end of the first temperature sensing element 2.

[0050] Specifically, the plug 5 is fixedly connected to one end of the first temperature sensing element 2, which can be achieved by adhesive bonding, elastic connection, or other methods. The plug 5 is fixed to the outer opening 622, or it can be inserted into the outer opening 622. This allows the first temperature sensing element 2 to be fixed in a set position, preventing the first temperature sensing element 2 from contacting the inner wall of the socket 4.

[0051] Alternatively, the first temperature measuring element 2 can be fixed to the position of the outer port 622 by a fixed bracket, without making specific limitations here.

[0052] According to some other embodiments of this application, the plug 5 seals the outer opening 622 and presses against the filling part 3.

[0053] Specifically, the plug 5 is inserted into the temperature measuring channel 62 through the outer opening 622 and presses against the end face of the filling part 3 where the insertion port is provided. This can limit the filling part 3 to a certain extent, and at the same time, the plug 5 can also block the insertion port.

[0054] Compared with the prior art, this application has the following advantages:

[0055] By filling the temperature measuring channel 62 with the heat-conducting part 1 and the filling part 3, leakage of molten metal into the furnace body 6 through the temperature measuring channel 62 can be prevented. Simultaneously, direct contact between the molten metal and the first temperature measuring element 2 is avoided, preventing aluminum slag from depositing on the outer wall of the first temperature measuring element 2. This would result in the formation of a low thermal conductivity (<1 W / (m·K)) insulation layer on the outer wall of the first temperature measuring element 2, leading to a systematic underestimation of the temperature reading by more than 15°C. Furthermore, this method protects the first temperature measuring element 2, extending its service life and stability, reducing unplanned shutdowns and maintenance time, and improving smelting efficiency.

[0056] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The above description of the implementation methods is only for the purpose of helping to understand the core idea of ​​this utility model. It should be noted that relational terms such as "first" and "second" are only used to distinguish one component from another that has the same name, and do not necessarily require or imply any such actual relationship or order between these components.

[0057] The foregoing embodiments are merely illustrative. Those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the scope of the claims. Furthermore, those skilled in the art can combine the embodiments in part or in whole, and all technical solutions derived from such combinations fall within the scope of this patent.

Claims

1. A temperature measuring device for an aluminum alloy smelting furnace, characterized in that, It includes a temperature-conducting part (1), a first temperature-measuring element (2), and a second temperature-measuring element for calibrating the first temperature-measuring element (2). The temperature-conducting part (1) is used to maintain thermal contact with the molten metal in the aluminum alloy smelting furnace. The first temperature-measuring element (2) is in contact with the temperature-conducting part (1). The second temperature-measuring element is used to directly contact the molten metal.

2. The temperature measuring device for the aluminum alloy smelting furnace according to claim 1, characterized in that, The temperature-conducting part (1) is fixed inside the temperature measuring channel (62) of the aluminum alloy smelting furnace; The temperature measuring device for the aluminum alloy smelting furnace also includes: The filling part (3) is fixed in the gap between the temperature conducting part (1) and the wall of the temperature measuring channel (62).

3. The temperature measuring device for the aluminum alloy smelting furnace according to claim 2, characterized in that, The temperature-conducting part (1) has a temperature-conducting surface (11), which is flush with the inner wall of the aluminum alloy smelting furnace.

4. The temperature measuring device for the aluminum alloy smelting furnace according to claim 3, characterized in that, The bottom of the first temperature sensing element (2) is located inside the insertion hole (4) of the temperature-conducting part (1) and abuts against the bottom end of the insertion hole (4); the vertical distance between the bottom end of the insertion hole (4) and the temperature-conducting surface (11) is between 50mm and 100mm.

5. The temperature measuring device for the aluminum alloy smelting furnace according to claim 4, characterized in that, The insertion hole (4) extends to the filling portion (3) to form a socket, and the dimension of the insertion hole (4) in its extending direction is between 800 mm and 1200 mm.

6. The temperature measuring device for the aluminum alloy smelting furnace according to claim 4, characterized in that, The inner wall of the socket (4) is spaced apart from the side wall of the first temperature measuring element (2).

7. The temperature measuring device for the aluminum alloy smelting furnace according to claim 6, characterized in that, The temperature measuring channel (62) penetrates the outer wall of the aluminum alloy smelting furnace to form an outer opening (622); the temperature measuring device also includes a plug (5) inserted into the outer opening (622), and the plug (5) fixes one end of the first temperature measuring element (2).

8. The temperature measuring device for the aluminum alloy smelting furnace according to claim 7, characterized in that, The plug (5) blocks the outer opening (622) and presses against the filling part (3).

9. The temperature measuring device for an aluminum alloy smelting furnace according to any one of claims 1-8, characterized in that, The heat-conducting part (1) is silicon carbide or silicon nitride.

10. The temperature measuring device for an aluminum alloy smelting furnace according to any one of claims 1-8, characterized in that, It also includes a temperature compensation device, wherein the first temperature measuring element (2) and the second temperature measuring element are electrically connected to the temperature compensation device.

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