An apparatus for measuring the temperature of molten metal

Abstract

The present invention belongs to the technical field of temperature measurement in the metal smelting industry, and particularly relates to a device for measuring the temperature of molten metal. It includes a molten metal temperature measuring body and a measuring body limiting mechanism. The measuring end of the molten metal temperature measuring body penetrates through the mounting hole on the wall of the molten metal holding container and is placed in the molten metal. The measuring body limiting mechanism is installed on the outer side of the wall of the molten metal holding container, and the measuring body limiting mechanism limits the molten metal temperature measuring body. The molten metal temperature measuring body measures the temperature of the molten metal inside the molten metal holding container through photoelectric sensing and has a liquid leakage prevention function. The present invention has good temperature measurement stability, high precision, and is simple to operate, easy to use and maintain. At the same time, the present invention has a functional design for preventing liquid leakage, eliminating the safety hazards existing in this temperature measurement method.

Description

Technical Field

[0001] The present invention belongs to the technical field of temperature measurement in the metal smelting industry, and particularly relates to a device for measuring the temperature of molten metal. Background Art

[0002] In the metal smelting industry, keeping the molten metal within a certain temperature range is a crucial part of the entire production process. Therefore, real-time continuous temperature measurement of molten metal and the accuracy of temperature measurement are indispensable important operation contents.

[0003] Currently, one of the commonly used temperature measurement methods in the industry is to insert a blackbody cavity temperature measuring tube above the molten metal retainer for continuous temperature measurement. However, its temperature measurement accuracy is greatly affected by the depth inserted into the molten metal, and it is severely eroded by the slag line of the molten metal liquid surface, resulting in a serious impact on the life of the temperature measuring tube. At the same time, when using the blackbody cavity temperature measuring tube, it is necessary to calibrate the temperature measuring tube regularly, otherwise it will lead to a decrease in measurement accuracy, and its installation, use and maintenance are also relatively cumbersome, and the quality requirements for operators are relatively high.

[0004] Another commonly used temperature measurement method is to embed a protective sleeve made of refractory material on the side wall or bottom wall of the molten metal retainer to cover the armored thermocouple for temperature measurement. However, the thermocouple wire of the commonly used thermocouple is made of rare precious metal platinum-rhodium, so the temperature measurement cost is relatively high. At the same time, it takes a long time for the thermocouple to reach the temperature equilibrium with the molten metal, so its temperature measurement method cannot be fast and effective. And more importantly, when the protective sleeve made of refractory material is damaged and broken due to thermal shock, physical and chemical corrosion, and mechanical erosion, there is a safety hazard that the molten metal flows out along the gap in the thermocouple temperature measuring tube. Summary of the Invention

[0005] Aiming at the above problems, the purpose of the present invention is to provide a device for measuring the temperature of molten metal, so as to solve the problems of low measurement accuracy, long measurement time and potential safety hazard of liquid leakage in the existing temperature measurement methods.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] The present invention provides a device for measuring the temperature of molten metal, which includes a molten metal temperature measuring body and a measuring body limiting mechanism. The measuring end of the molten metal temperature measuring body penetrates through the mounting hole on the wall of the molten metal holding container and is placed in the molten metal. The measuring body limiting mechanism is installed on the outer side of the wall of the molten metal holding container, and the measuring body limiting mechanism limits the molten metal temperature measuring body. The molten metal temperature measuring body measures the temperature of the molten metal inside the molten metal holding container through photoelectric sensing; the molten metal temperature measuring body includes an outer peripheral protective sleeve, a temperature measuring tube, a holding member and a leak-proof sleeve. The temperature measuring tube is arranged inside the outer peripheral protective sleeve, and the closed ends of the temperature measuring tube and the outer peripheral protective sleeve face the same direction. The open end of the temperature measuring tube is fixed to the open end of the outer peripheral protective sleeve through the holding member. The leak-proof sleeve is arranged inside the holding member. The leak-proof sleeve expands several times due to the high temperature impact of the molten metal when the outer peripheral protective sleeve and the temperature measuring tube are broken, so as to seal the entire temperature measuring path and achieve the function of preventing liquid leakage.

[0008] The leak-proof sleeve is made of a refractory sealing material that expands several times at a temperature higher than 300°C.

[0009] The holding member is provided with a stepped through hole along the axial direction. The open end of the temperature measuring tube is inserted into one end of the stepped through hole and is axially limited by an inner stop. The temperature measuring tube is fixed to the holding member through a high-temperature adhesive; the leak-proof sleeve is placed inside the holding member from the other end of the stepped hole and is axially limited by an inner stop. The outer end of the leak-proof sleeve is axially limited by a limiting component.

[0010] The outer surface of one end of the holding member connected to the temperature measuring tube is provided with a ring groove, and refractory mud is coated in the ring groove to fill the gap after the holding member and the inner wall of the outer peripheral protective sleeve are installed;

[0011] The outer surface of the other end of the holding member away from the temperature measuring tube and the outer peripheral protective sleeve are in conical surface fit and are fixed through a high-temperature adhesive.

[0012] The material of the outer peripheral protective sleeve is made of refractory metal oxide; the gap between the outer surface of the outer peripheral protective sleeve and the wall of the molten metal holding container is filled with refractory mud for sealing; the depth of the molten metal temperature measuring body inserted into the molten metal is not less than one-fourth of the length of the outer peripheral protective sleeve.

[0013] The material of the temperature measuring tube is molybdenum-based metal ceramic. The inner wall diameter of the temperature measuring tube is not less than 10 mm, and the linear distance of the gap between the outer wall of the temperature measuring tube and the inner wall of the outer peripheral protective sleeve is not more than 1 mm; the inner diameter of the temperature measuring tube is consistent with the minimum inner diameter of the holding member and the inner diameter of the leak-proof sleeve.

[0014] The holding member is made of seamless stainless steel pipe, and the end of the holding member exposed outside the wall surface of the molten metal holding container is processed into a structural form capable of quick plug connection with the photoelectric temperature measuring device.

[0015] The wall surface of the molten metal holding container includes a working layer of the molten metal holding container, a permanent layer of the molten metal holding container, and an outer wall surface of the molten metal holding container in sequence from inside to outside.

[0016] The measuring body limiting mechanism includes a fastening pressing block, a graduated stud, and a nut. There are multiple graduated studs, which are arranged around the mounting holes on the molten metal holding container. The fastening pressing block is provided with multiple positioning holes for the graduated studs to pass through. After the graduated studs pass through the corresponding positioning holes on the fastening pressing block, they are threadedly connected with the nut to press the outer peripheral protective sleeve tightly.

[0017] The advantages and beneficial effects of the present invention are as follows: A device for measuring the temperature of molten metal provided by the present invention can continuously measure the temperature of molten metal at a relatively low cost, timely reflect the temperature change, and contribute to rapid response and processing; the temperature measurement method of this device has good temperature measurement stability, high accuracy, simple operation, and is easy to use and maintain; at the same time, this device has a leakage prevention function design, eliminating the safety hazards existing in this temperature measurement method. Description of the Drawings

[0018] Figure 1 It is a schematic structural diagram of a device for measuring the temperature of molten metal according to the present invention;

[0019] Figure 2 It is a partial sectional view of a device for measuring the temperature of molten metal according to the present invention.

[0020] In the figure: 1 is the outer peripheral protective sleeve, 2 is the temperature measuring tube, 3 is the holding member, 4 is the leakage prevention sleeve, 5 is the elastic retaining ring, 6 is the fastening pressing block, 7 is the graduated stud, 8 is the nut, 9 is the outer wall surface of the molten metal holding container, 10 is the permanent layer of the molten metal holding container, and 11 is the working layer of the molten metal holding container. Detailed Embodiments

[0021] In order to make the purpose, technical solutions, and advantages of the present invention clearer, the present invention will be described in detail below with reference to the drawings and specific embodiments.

[0022] See Figure 1 and Figure 2As shown in the figure, a device for measuring the temperature of molten metal provided by the present invention includes a molten metal temperature measuring body and a measuring body limiting mechanism. The measuring end of the molten metal temperature measuring body penetrates through the mounting hole on the wall of the molten metal holding container and is placed in the molten metal. The measuring body limiting mechanism is installed on the outer side of the wall of the molten metal holding container, and the measuring body limiting mechanism limits the molten metal temperature measuring body. The molten metal temperature measuring body measures the temperature of the molten metal inside the molten metal holding container through photoelectric sensing, and the molten metal temperature measuring body has a liquid leakage prevention function.

[0023] See Figure 1 As shown in the figure, in an embodiment of the present invention, the wall of the molten metal holding container includes a working layer 11 of the molten metal holding container, a permanent layer 10 of the molten metal holding container, and an outer wall surface 9 of the molten metal holding container from the inside to the outside in sequence.

[0024] See Figure 2 As shown in the figure, in an embodiment of the present invention, the molten metal temperature measuring body includes an outer peripheral protective sleeve 1, a temperature measuring tube 2, a holding member 3, and a leak prevention sleeve 4. The temperature measuring tube 2 is arranged inside the outer peripheral protective sleeve 1, and the closed ends of the temperature measuring tube 2 and the outer peripheral protective sleeve 1 face the same direction. The open end of the temperature measuring tube 2 is fixed to the open end of the outer peripheral protective sleeve 1 through the holding member 3. The leak prevention sleeve 4 is arranged inside the holding member 3. The leak prevention sleeve 4 has the function of expanding several times due to the high-temperature impact of the molten metal when the outer peripheral protective sleeve 1 and the temperature measuring tube 2 are broken, thereby sealing the entire temperature measuring passage and realizing the liquid leakage prevention function.

[0025] In an embodiment of the present invention, the leak prevention sleeve 4 is made of a refractory sealing material that expands several times at a temperature higher than 300°C. Preferably, the leak prevention sleeve 4 is processed from expandable graphite sheets. When the outer peripheral protective sleeve 1 and the temperature measuring tube 2 are broken due to the corrosion and erosion of the molten metal, the leak prevention sleeve 4 expands several times due to the high-temperature impact of the molten metal, thereby sealing the entire temperature measuring passage and ensuring the safety and reliability of the temperature measuring device.

[0026] In an embodiment of the present invention, the holding member 3 is provided with a stepped through hole along the axial direction. The open end of the temperature measuring tube 2 is inserted into one end of the stepped through hole and axially limited by an inner stop. The temperature measuring tube 2 is fixed to the holding member 3 through a high-temperature adhesive; the leak prevention sleeve 4 is placed into the inside of the holding member 3 from the other end of the stepped hole and axially limited by an inner stop, and the outer end of the leak prevention sleeve 4 is axially limited by a limiting member. That is, the temperature measuring tube 2 and the leak prevention sleeve 4 are respectively located on both sides of the positioning step inside the holding member 3.

[0027] Specifically, the limiting member uses an elastic retaining ring 5 to axially limit the leak prevention sleeve 4, and other safe and reliable methods can also be used for fixation.

[0028] Furthermore, the outer surface of one end of the holding member 3 connected to the temperature measuring tube 2 is provided with an annular groove, and refractory mud is coated in the annular groove to fill the gap after the holding member 3 and the inner wall of the outer peripheral protective sleeve 1 are installed; specifically, refractory mud with a thickness of 2 mm is coated in the annular groove of the holding member 3. The outer surface of the other end of the holding member 3 away from the temperature measuring tube 2 and the outer peripheral protective sleeve 1 are in conical surface fit and are fixed by a high-temperature adhesive. That is, the outer conical surface of the holding member 3 and the inner conical surface of the outer peripheral protective sleeve 1 are fixed and connected by a combination of conical surface pressing and high-temperature adhesive.

[0029] In the embodiment of the present invention, the material of the outer peripheral protective sleeve 1 is made of refractory metal oxide; the outer surface shape of the front end of the outer peripheral protective sleeve 1 inserted into the molten metal is cylindrical, the outer surface shape of the rear end of the outer peripheral protective sleeve 1 away from the molten metal with a length not greater than 40 mm is cylindrical, and the outer surface shape of the middle part of the outer peripheral protective sleeve 1 is conical. The gap between the outer surface of the outer peripheral protective sleeve 1 and the permanent layer 10 and the working layer 11 of the molten metal holding container is filled with refractory mud for sealing; the depth of the molten metal temperature measuring body inserted into the molten metal is not less than one-fourth of the length of the outer peripheral protective sleeve 1.

[0030] In the embodiment of the present invention, the material of the temperature measuring tube 2 is made of molybdenum-based metal ceramic, the inner wall diameter of the temperature measuring tube 2 is not less than 10 mm, and the linear distance of the gap between the outer wall of the temperature measuring tube 2 and the inner wall of the outer peripheral protective sleeve 1 is not greater than 1 mm; the inner diameter of the temperature measuring tube 2 is consistent with the minimum inner diameter of the holding member 3 and the inner diameter of the leak-proof sleeve 4.

[0031] In the embodiment of the present invention, the holding member 3 is processed from seamless stainless steel pipe, or can also be processed by segments and then welded. The part of the holding member 3 inserted into the outer peripheral protective sleeve 1 is used to support and fix the temperature measuring tube 2, the leak-proof sleeve 4 and the elastic retaining ring 5, and the end of the holding member 3 exposed outside the wall surface of the molten metal holding container is processed into a structural form capable of quick plug connection with the photoelectric temperature measuring device.

[0032] See Figure 1 As shown, in the embodiment of the present invention, the measuring body limiting mechanism includes a fastening pressing block 6, a graduated stud 7 and a nut 8. Among them, there are multiple graduated studs 7, and they are arranged around the mounting holes on the molten metal holding container. The fastening pressing block 6 is provided with multiple positioning holes for the graduated studs 7 to pass through. After the graduated studs 7 pass through the corresponding positioning holes on the fastening pressing block 6, they are threadedly connected with the nut 8, and the nut 8 presses the fastening pressing block 6 to make the inner end of the fastening pressing block 6 press against the rear end surface of the outer peripheral protective sleeve 1.

[0033] Specifically, three graduated studs 7 are evenly distributed and welded at the outer peripheral circle of the mounting holes on the outer wall surface 9 of the molten metal holding container. The three positioning holes of the fastening block 6 pass through the corresponding graduated studs 7, and two nuts 8 are used on each graduated stud 7 to fix the fastening block 6 and press the outer peripheral protective sleeve 1 tightly.

[0034] A device for measuring the temperature of molten metal provided by the present invention has the following working principle:

[0035] The device is installed on the closed wall surface of the molten metal holding container used in the metal smelting process, and can be inserted into the molten metal to a depth not less than one-fourth of the length of the outer peripheral protective sleeve 1; the device measures the temperature of the molten metal in the form of photoelectric sensing; the anti-leakage function of the device means that if either the outer peripheral protective sleeve 1 or the temperature measuring tube 2 breaks or both break simultaneously, no molten metal will flow out of the temperature measuring device, ensuring the safety and reliability of the temperature measuring process.

[0036] A device for measuring the temperature of molten metal provided by the present invention can continuously measure the temperature of molten metal at a relatively low cost, promptly reflect the temperature change, and contribute to rapid response and processing; the temperature measuring method of this device has good temperature measuring stability, high precision, simple operation, and is easy to use and maintain; at the same time, this device has a leak-proof function design, eliminating the safety hazards existing in this temperature measuring method.

[0037] The above description is only the implementation mode of the present invention and is not used to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, extension, etc. made within the spirit and principle of the present invention are all included in the protection scope of the present invention.

Claims

1. A device for measuring the temperature of molten metal, characterized in that The device comprises a molten metal temperature measuring body and a measuring body limiting mechanism, wherein the measuring end of the molten metal temperature measuring body passes through a mounting hole on the wall of the molten metal holding container and is placed in the molten metal. The measuring body limiting mechanism is installed on the outside of the wall of the molten metal holding container and limits the position of the molten metal temperature measuring body. The molten metal temperature measuring body measures the temperature of the molten metal inside the molten metal holding container through photoelectric sensing. The molten metal temperature measuring body comprises an outer peripheral protective sleeve (1), a temperature measuring tube (2), a retaining member (3) and a leak-proof sleeve (4), wherein the temperature measuring tube (2) is arranged in the outer peripheral protective sleeve (1), and the closed ends of the temperature measuring tube (2) and the outer peripheral protective sleeve (1) are oriented in the same direction, the open end of the temperature measuring tube (2) is fixed to the open end of the outer peripheral protective sleeve (1) through the retaining member (3), and the leak-proof sleeve (4) is arranged inside the retaining member (3). When the outer peripheral protective sleeve (1) and the temperature measuring tube (2) are broken, the leak-proof sleeve (4) expands several times due to the impact of the high temperature of the molten metal, thereby sealing the entire temperature measuring passage and realizing the liquid leakage prevention function; The leak-proof sleeve (4) is made of a fire-resistant sealing material that expands several times at a high temperature greater than 300°C; The retaining member (3) is provided with a stepped through hole along the axial direction, the open end of the temperature measuring tube (2) is inserted into one end of the stepped through hole and is axially limited by the inner stop, and the temperature measuring tube (2) is fixed to the retaining member (3) by a high-temperature adhesive; the leak-proof sleeve (4) is placed into the interior of the retaining member (3) from the other end of the stepped through hole and is axially limited by the inner stop, and the outer end of the leak-proof sleeve (4) is axially limited by a limiting component; An annular groove is provided on the outer surface of one end of the retaining member (3) connected to the temperature measuring tube (2), and refractory mud is coated in the annular groove to fill the gap between the retaining member (3) and the inner wall of the peripheral protective sleeve (1) after installation; The outer surface of the other end of the retaining member (3) away from the temperature measuring tube (2) is conically matched with the outer peripheral protective sleeve (1) and is fixed by a high-temperature adhesive; The material of the peripheral protective sleeve (1) is made of refractory metal oxide; the gap between the outer surface of the peripheral protective sleeve (1) and the wall surface of the molten metal holding container is filled with refractory mud for sealing; the depth of the molten metal temperature measuring body inserted into the molten metal is not less than one quarter of the length of the peripheral protective sleeve (1); The measuring body limiting mechanism comprises a fastening block (6), a scaled stud (7) and a nut (8), wherein the scaled stud (7) is multiple and is arranged around the mounting hole on the molten metal holding container, and the fastening block (6) is provided with multiple positioning holes for the scaled stud (7) to pass through. After the scaled stud (7) passes through the corresponding positioning holes on the fastening block (6), it is threadedly connected with the nut (8), so that the fastening block (6) presses the peripheral protective sleeve (1).

2. The device for measuring the temperature of molten metal according to claim 1, characterized in that The material of the temperature measuring tube (2) is molybdenum-based metal ceramics, the inner wall diameter of the temperature measuring tube (2) is not less than 10 mm, and the straight-line distance between the outer wall of the temperature measuring tube (2) and the inner wall of the peripheral protective sleeve (1) is not more than 1 mm; the inner diameter of the temperature measuring tube (2) is consistent with the minimum inner diameter of the retaining member (3) and the inner diameter of the leak-proof sleeve (4).

3. The device for measuring the temperature of molten metal according to claim 1, characterized in that The retaining member (3) is made of a seamless stainless steel pipe, and the end of the retaining member (3) exposed outside the wall of the molten metal retaining container is processed into a structural form capable of being quickly connected to a photoelectric temperature measuring device.

4. The device for measuring the temperature of molten metal according to claim 1, characterized in that The wall surface of the molten metal holding container is composed of a molten metal holding container working layer (11), a molten metal holding container permanent layer (10) and an outer wall surface (9) of the molten metal holding container from the inside to the outside.

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