Device for measuring temperature of molten metal

Abstract

The 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. Comprising a molten metal temperature measuring body and a measuring body limiting mechanism, the measuring end of the molten metal temperature measuring body penetrates through an installation hole in the wall face of a molten metal holding container and is arranged in molten metal, and the measuring body limiting mechanism is installed on the outer side of the wall face of the molten metal holding container. The measuring body limiting mechanism limits the molten metal temperature measuring body, the molten metal temperature measuring body measures the temperature of molten metal in the molten metal holding container through photoelectric sensing, and the liquid leakage prevention function is achieved. The device is good in temperature measurement stability, high in precision, simple to operate, and easy to use and maintain; meanwhile, the liquid leakage prevention function design is achieved, and potential safety hazards existing in the temperature measuring mode are eliminated.

Description

Technical Field

[0001] The invention belongs to the technical field of temperature measurement in metal smelting industry, and in particular 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 and continuous temperature measurement of the molten metal and the accuracy of the temperature measurement are indispensable and important work contents.

[0003] At present, the most commonly used temperature measurement method in the industry is to insert a black body cavity temperature measuring tube above the molten metal retainer for continuous temperature measurement. However, its temperature measurement accuracy is greatly affected by the depth of insertion into the molten metal, and is severely corroded by the slag line on the molten metal liquid surface, which seriously affects the life of the temperature measuring tube. At the same time, when using a black body 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 cumbersome, requiring high quality of operators.

[0004] The second commonly used temperature measurement method is to embed a protective cover 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 commonly used thermocouple wire is made of rare precious metals such as platinum and rhodium, so the temperature measurement cost is relatively high. At the same time, it takes a long time for the thermocouple to reach a temperature in equilibrium with the molten metal, so its temperature measurement method cannot be fast and effective. What is more important is that when the protective cover made of refractory material is damaged and broken due to thermal shock, physical and chemical corrosion, and mechanical scouring, there is a safety hazard that the molten metal will flow out along the gap in the thermocouple temperature measuring tube. Summary of the invention

[0005] In view of the above problems, the purpose of the present invention is to provide a device for measuring the temperature of molten metal to solve the problems of low measurement accuracy, long measurement time and potential safety hazards of leakage in existing temperature measurement methods.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: The present invention provides a device for measuring the temperature of molten metal, comprising 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 a 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, and 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 cover, a temperature measuring tube, a retaining component and a leakproof cover, wherein the temperature measuring tube is arranged in the outer peripheral protective cover, and the closed ends of the temperature measuring tube and the peripheral protective cover are oriented in the same direction, the open end of the temperature measuring tube is fixed to the open end of the outer peripheral protective cover by a retaining component, the leakproof cover is arranged inside the retaining component, and the leakproof cover has the function of expanding several times due to the high temperature impact of the molten metal when the outer peripheral protective cover and the temperature measuring tube are broken, thereby sealing the entire temperature measuring passage and realizing the function of preventing liquid leakage.

[0007] The leak-proof sleeve is made of a fire-resistant sealing material that expands several times at a high temperature greater than 300°C.

[0008] The retaining component is axially provided with a stepped through hole, the open end of the temperature measuring tube is inserted into one end of the stepped through hole and axially limited by an inner stop, and the temperature measuring tube is fixed to the retaining component by a high-temperature adhesive; the leak-proof sleeve is placed into the interior of the retaining component from the other end of the stepped hole and axially limited by the inner stop, and the outer end of the leak-proof sleeve is axially limited by a limiting component.

[0009] An annular groove is provided on the outer surface of one end of the retaining member connected to the temperature measuring tube, and refractory mud is coated in the annular groove to fill the gap between the retaining member and the inner wall of the peripheral protective sleeve after installation; The outer surface of the other end of the retaining member away from the temperature measuring tube is matched with the outer peripheral protection sleeve in a conical surface and is fixed by a high-temperature adhesive.

[0010] The material of the peripheral protective sleeve is made of refractory metal oxide; the gap between the outer surface of the 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 quarter of the length of the peripheral protective sleeve.

[0011] 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 straight-line distance between the outer wall of the temperature measuring tube and the inner wall of the outer protective cover is not greater than 1 mm; the inner diameter of the temperature measuring tube is consistent with the minimum inner diameter of the retaining component and the inner diameter of the leak-proof cover.

[0012] The retaining member is made of seamless stainless steel pipe, and the end of the retaining member exposed outside the wall surface of the molten metal holding container is processed into a structural form that can be quickly connected to the photoelectric temperature measuring device.

[0013] The wall surface of the molten metal holding container is composed of a molten metal holding container working layer, a molten metal holding container permanent layer and an outer wall surface of the molten metal holding container from the inside to the outside.

[0014] The measuring body limiting mechanism includes a fastening block, a scaled stud and a nut, wherein there are multiple scaled studs, which are arranged around the mounting holes on the molten metal holding container, and the fastening block is provided with multiple positioning holes for the scaled studs to pass through. After the scaled studs pass through the corresponding positioning holes on the fastening block, they are threadedly connected with the nut, so that the fastening block presses the peripheral protective cover.

[0015] 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, promptly respond to temperature changes, and facilitate rapid response and processing; the temperature measurement method of the device has good temperature measurement stability and high accuracy, and is simple to operate and easy to use and maintain; at the same time, the device has a functional design that prevents liquid leakage, eliminating the safety hazards of this temperature measurement method. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of a device for measuring the temperature of molten metal according to the present invention; Figure 2 The present invention is a partial cross-sectional view of a device for measuring the temperature of molten metal.

[0017] In the figure: 1 is an outer protective sleeve, 2 is a temperature measuring tube, 3 is a retaining member, 4 is a leak-proof sleeve, 5 is an elastic retaining ring, 6 is a fastening block, 7 is a stud with scale, 8 is a nut, 9 is an outer wall surface of the molten metal holding container, 10 is a permanent layer of the molten metal holding container, and 11 is a working layer of the molten metal holding container. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] See also Figure 1 and Figure 2As shown, the present invention provides a device for measuring the temperature of molten metal, comprising 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 a 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.

[0020] See also Figure 1 As shown, in the embodiment of the present invention, the wall surfaces of the molten metal holding container are, from the inside to the outside, the molten metal holding container working layer 11, the molten metal holding container permanent layer 10 and the molten metal holding container outer wall surface 9.

[0021] See also Figure 2 As shown, in an embodiment of the present invention, a molten metal temperature measuring body comprises an outer peripheral protective cover 1, a temperature measuring tube 2, a retaining member 3 and a leak-proof cover 4, wherein the temperature measuring tube 2 is arranged in the outer peripheral protective cover 1, and the closed ends of the temperature measuring tube 2 and the outer peripheral protective cover 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 cover 1 by the retaining member 3, and the leak-proof cover 4 is arranged inside the retaining member 3. When the outer peripheral protective cover 1 and the temperature measuring tube 2 are broken, the leak-proof cover 4 expands several times due to the high temperature impact of the molten metal, thereby sealing the entire temperature measuring passage and realizing the function of preventing liquid leakage.

[0022] In the embodiment of the present invention, the leakproof cover 4 is made of a refractory sealing material that expands several times at a high temperature greater than 300°C. Preferably, the leakproof cover 4 is made of expandable graphite sheet. When the peripheral protective cover 1 and the temperature measuring tube 2 are broken due to the corrosion and erosion of the molten metal, the leakproof cover 4 expands several times due to the impact of the high temperature of the molten metal, thereby sealing the entire temperature measuring passage, ensuring the safety and reliability of the temperature measuring device.

[0023] In the embodiment of the present invention, the holding member 3 is provided with a stepped through hole in 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 the inner stop, and the temperature measuring tube 2 is fixed to the holding member 3 by a high-temperature adhesive; the leak-proof sleeve 4 is placed into the inside of the holding member 3 from the other end of the stepped hole and axially limited by the inner stop, and the outer end of the leak-proof sleeve 4 is axially limited by a limiting component. That is, the temperature measuring tube 2 and the leak-proof sleeve 4 are respectively located on both sides of the positioning step inside the holding member 3.

[0024] Specifically, the limiting component uses an elastic retaining ring 5 to axially limit the leak-proof sleeve 4, and other safe and reliable methods can also be used to fix it.

[0025] Furthermore, an annular groove is provided on the outer surface of one end of the holding member 3 connected to the temperature measuring tube 2, and refractory mud is coated in the annular groove to fill the gap between the holding member 3 and the inner wall of the peripheral protective sleeve 1 after installation; specifically, the annular groove of the holding member 3 is coated with refractory mud with a thickness of 2 mm. The outer surface of the other end of the holding member 3 away from the temperature measuring tube 2 is matched with the peripheral protective sleeve 1 in a conical surface, and is fixed by a high-temperature adhesive. That is, the outer conical surface of the holding member 3 and the inner conical surface of the peripheral protective sleeve 1 are fixed and connected by a combination of conical surface compression and high-temperature adhesive.

[0026] In the embodiment of the present invention, the material of the peripheral protective cover 1 is made of refractory metal oxide; the outer surface of the front end of the peripheral protective cover 1 inserted into the molten metal is cylindrical, the outer surface of the rear end of the peripheral protective cover 1 away from the molten metal is not more than 40 mm long is cylindrical, and the outer surface of the middle part of the peripheral protective cover 1 is conical. The gap between the outer surface of the peripheral protective cover 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 quarter of the length of the peripheral protective cover 1.

[0027] In an embodiment of the present invention, the material of the temperature measuring tube 2 is molybdenum-based metal ceramic, 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 outer protective cover 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 retaining component 3 and the inner diameter of the leak-proof cover 4.

[0028] In the embodiment of the present invention, the retaining member 3 is made of seamless stainless steel pipe, and can also be made of segmented processing and then welded. The portion of the retaining member 3 inserted into the peripheral protective sleeve 1 is used to support and fix the temperature measuring tube 2, the leakproof sleeve 4 and the elastic retaining ring 5, and the end of the retaining member 3 exposed outside the wall of the molten metal holding container is processed into a structure that can be quickly connected with the photoelectric temperature measuring device.

[0029] See also Figure 1 As shown, in an embodiment of the present invention, the measuring body limiting mechanism includes a fastening block 6, a scaled stud 7 and a nut 8, wherein there are multiple scaled studs 7, and they are arranged around the mounting holes on the molten metal holding container, and the fastening block 6 is provided with multiple positioning holes for the scaled studs 7 to pass through. After the scaled studs 7 pass through the corresponding positioning holes on the fastening block 6, they are threadedly connected with the nut 8, and the nut 8 presses the fastening block 6 so that the inner end of the fastening block 6 presses the rear end surface of the outer protective cover 1.

[0030] Specifically, three scaled studs 7 are evenly distributed and welded to the outer circumference of the mounting holes on the outer wall surface 9 of the molten metal holding container, and the three positioning holes of the fastening block 6 pass through the corresponding scaled studs 7. Two nuts 8 are used on each scaled stud 7 to fix the fastening block 6 and tighten the peripheral protective cover 1.

[0031] The present invention provides a device for measuring the temperature of molten metal, and its working principle is: The device is installed on the closed wall surface of a 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 protective cover 1; the device measures the temperature of the molten metal in the form of photoelectric sensing; the device has a liquid leakage prevention function that means that if any one of the outer protective cover 1 and the temperature measuring tube 2 breaks or breaks at the same time, no molten metal will flow out of the temperature measuring device, thereby ensuring the safety and reliability of the temperature measurement process.

[0032] The present invention provides a device for measuring the temperature of molten metal, which can continuously measure the temperature of molten metal at a relatively low cost, promptly respond to temperature changes, and facilitate rapid response and processing; the temperature measurement method of the device has good temperature measurement stability and high accuracy, and is simple to operate and easy to use and maintain; at the same time, the device has a functional design that prevents liquid leakage, eliminating the safety hazards of this temperature measurement method.

[0033] The above description is only an embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, expansion, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A device for measuring the temperature of molten metal, characterized in that: It 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 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, and the molten metal temperature measuring body measures the molten metal temperature 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 leakproof 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) by the retaining member (3), and the leakproof 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 leakproof 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 function of preventing liquid leakage.

2. The device for measuring the temperature of molten metal according to claim 1, characterized in that: 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.

3. The device for measuring the temperature of molten metal according to claim 1, characterized in that: 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 axially limited by an inner stopper, and the temperature measuring tube (2) is fixed to the retaining member (3) by a high-temperature adhesive; the leak-proof sleeve (4) is inserted into the interior of the retaining member (3) from the other end of the stepped through hole and axially limited by the inner stopper, and the outer end of the leak-proof sleeve (4) is axially limited by a limiting component.

4. The device for measuring the temperature of molten metal according to claim 1, characterized in that: 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.

5. The device for measuring the temperature of molten metal according to claim 1, characterized in that: 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).

6. 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 greater than 1 mm; the inner diameter of the temperature measuring tube (2) is consistent with the minimum inner diameter of the retaining component (3) and the inner diameter of the leak-proof sleeve (4).

7. 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 surface of the molten metal retaining container is processed into a structural form capable of being quickly connected to a photoelectric temperature measuring device.

8. 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.

9. The device for measuring the temperature of molten metal according to claim 1, characterized in that: 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 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).

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