CN209918879U - Novel device for continuously measuring temperature of high-temperature molten metal and controlling size of steel flow - Google Patents
Novel device for continuously measuring temperature of high-temperature molten metal and controlling size of steel flow Download PDFInfo
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- CN209918879U CN209918879U CN201920332900.4U CN201920332900U CN209918879U CN 209918879 U CN209918879 U CN 209918879U CN 201920332900 U CN201920332900 U CN 201920332900U CN 209918879 U CN209918879 U CN 209918879U
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Abstract
The utility model relates to a novel device that is used for continuous temperature measurement of high temperature molten metal and control steel flow size, including the equal open-ended accuse stream mouth of a river device in both ends, the inner chamber is hollow structure's stopper rod body, and it has the temperature thermocouple to insert in the cavity, stopper rod body lower extreme fixedly connected with temperature sensing element, temperature sensing element one end opening, one end is sealed, and the open end forms inside intercommunication with stopper rod body fixed connection, the stopper rod body other end and connecting screw conical surface cooperation to it is fixed to carry out threaded connection with pre-buried coupling nut, and it has the transition layer to fill between temperature sensing element and the stopper rod body, and the temperature thermocouple lower extreme is located inside the temperature sensing element. The arc surface of the head of the stopper rod body is matched with a water gap device to regulate and control the size of the molten steel flow in real time, meanwhile, a temperature sensing element senses the temperature of the surrounding molten steel, the temperature sensing element is converted into an electric signal through a thermocouple, and the electric signal is processed through a signal connection joint device and a signal transmission device to obtain the temperature value of the molten metal in a temperature processing and display instrument.
Description
Technical Field
The utility model relates to a temperature measuring device, especially a novel device that is used for continuous temperature measurement of high temperature molten metal and control steel stream size belongs to the measurement field.
Background
In the metallurgical production process, temperature parameters are extremely important for controlling the metallurgical process, and poor temperature control directly causes the quality reduction of molten steel and the increase of energy consumption. In the conventional continuous casting tundish process, two modes for realizing continuous temperature measurement are provided, one mode is a mode of adding a protective sleeve based on a thermocouple, and the other mode is a mode of adding a temperature measuring probe based on non-contact measurement by adopting the protective sleeve; both of these two methods require a separate temperature measuring device and are incompatible with the molten metal flow control device, resulting in resource waste, complicated field use process, and severe hysteresis in temperature measurement.
Chinese patent CN1333455A discloses a temperature measuring tube for continuously measuring the temperature of molten steel, which is used for continuously measuring the temperature of molten steel in a continuous casting tundish. The temperature measuring tube is mainly made of refractory materials, and temperature measuring signals of the temperature measuring tube come from radiant energy emitted from the bottom of the inner tube. The conduction path firstly passes through an outer pipe with the thickness of 25-40mm, a gap between the outer pipe and the inner pipe with the wall thickness of 3mm, the reaction speed is slow, the thermal hysteresis is high, and the inner pipe is required to have high thermal shock resistance and high temperature resistance in use, and is easy to crack, so that the use of the product is influenced; the Chinese patent publications 200720013908.1, 200920143429.0, 201120053767.2 and 20072011415.4 adopt an inner tube with two open ends and an outer protection tube with one open end and one closed end, the bottom end of the outer tube is used as a temperature sensing element, the whole outer protection tube is made of the same material and is thicker at the bottom end, the thermal response time is improved compared with that of the Chinese patent CN1333455A, but a certain thermal response time is needed, and the sensor of the type has the defects that the lens falls ash after the temperature measuring device is used in a dusty metallurgical site for a period of time, the error of the temperature measuring system is easy to increase, and the problem of measuring accuracy is brought.
Chinese patent 201720781688.0 discloses a temperature measuring device for molten metal temperature, which adopts a radiation temperature measuring method to realize the functions of controlling and measuring the temperature of molten steel, and provides the wall thickness of a composite sensor and the length-diameter ratio of the exposed length, wherein the wall thickness range of the composite sensor is 1 ~ 10mm, and the optimal length-diameter ratio is 1 ~ 20.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a novel device that is used for the continuous temperature measurement of high temperature molten metal and controls the steel stream size, close as an organic whole with the molten metal accuse stream with the molten metal temperature measurement, saved dedicated temperature measuring device, increased the added value of product, reduced use cost. And secondly, by compounding a special temperature sensing element, the response speed and the temperature measurement accuracy of the sensor are improved, and the method has practical popularization significance.
For solving the above problems, the specific technical scheme of the utility model is as follows: a novel device for continuous temperature measurement of high temperature molten metal and control steel flow size, the equal open-ended accuse in both ends flows mouth of a river device, the inner chamber is hollow structure's stopper rod body, it has the temperature thermocouple to insert in the cavity, stopper rod body lower extreme fixedly connected with temperature sensing element, stopper rod body both ends opening, temperature-sensing element one end opening, one end is sealed, the open end forms inside intercommunication with stopper rod body fixed connection, the stopper rod body other end and connecting screw conical surface cooperation, and it is fixed through threaded connection, it has the transition layer to fill between temperature-sensing element and the stopper rod body, the temperature thermocouple lower extreme is located inside the temperature-sensing element. The arc surface of the head of the stopper rod body is matched with a water gap device to regulate and control the size of the molten steel flow in real time, meanwhile, a temperature sensing element senses the temperature of the surrounding molten steel, the temperature sensing element is converted into an electric signal through a thermocouple, and the electric signal is processed through a signal connection joint device and a signal transmission device to obtain the temperature value of the molten metal in a temperature processing and display instrument.
The ratio of the length L1 of the temperature sensing element exposed out of the stopper rod body head to the inner diameter D1 of the temperature sensing element is L1/D1=0.5 ~ 0.9999.9999, and the exposed length L1=5 ~ 30 mm.
The inner diameter D1 of the temperature sensing element is 13-28mm, the outer diameter D2 is 17-37mm, and the wall thickness D1= 2.0 ~ 4.5.5 mm.
The inner diameter D1 of the temperature sensing element is 10-20mm, the outer diameter D2 is 14-29mm, and the wall thickness D1= 2.0 ~ 4.5.5 mm.
The length L2=5 ~ 80mm and the thickness d2=0.1-10mm of the transition layer.
The thermocouple protective sleeve is sleeved on the outer circumference of the temperature thermocouple, and the distance from the bottom end of the thermocouple protective sleeve to the inner wall of the bottom end of the temperature sensing element is 0.5-10 mm. The thermocouple protective sheath is used for improving thermocouple life.
The stopper rod body cavity in set up embedded nut, stopper rod body, temperature-sensing element and embedded nut are coaxial.
The thread of the connecting screw is connected with the embedded nut arranged in the stopper rod body, and the conical surface of the connecting screw is matched with the conical surface structure of the stopper rod body in an axial conical surface mode.
The outer surfaces of the stopper rod body and the temperature sensing element are coated with an anti-oxidation coating material; the temperature sensing element is combined with the stopper rod body by one or more methods including but not limited to extrusion, bonding and threaded connection.
The exhaust channel is arranged on the stopper rod body, the number of the channels is 1-100, the diameter of each channel is 0.01-5mm, and the total flow area of the exhaust channel is more than or equal to 1mm2The included angle B between the axis of the exhaust channel and the axis of the stopper rod body is 10-80 degrees.
The utility model discloses the beneficial effect who brings does: based on the flow control and continuous temperature measurement device for high-temperature molten metal provided by the utility model, according to the characteristics of sensing analysis and thermocouple temperature measurement, the temperature sensing element is thinner, so that the temperature transmission can be realized rapidly, and the thermal response speed of temperature measurement is improved; meanwhile, the flow control function of the stopper rod is kept.
Drawings
Fig. 1 is a schematic structural diagram of the novel device for continuously measuring the temperature of high-temperature molten metal and controlling the size of steel flow.
Fig. 2 is a schematic diagram of the novel device for continuous temperature measurement and steel flow control of high-temperature molten metal of the present invention.
Fig. 3 is a partial enlarged view of the novel device for continuous temperature measurement and steel flow control of high-temperature molten metal.
Fig. 4 is a structural diagram of the novel device for continuously measuring the temperature of the high-temperature molten metal and controlling the size of the steel flow.
FIG. 5 is a view showing the structure of the stopper body with an exhaust passage.
Fig. 6 is a structural diagram of the connecting screw rod in the novel device for continuously measuring the temperature of the high-temperature molten metal and controlling the size of the steel flow.
The temperature-measuring type water-saving plug comprises a plug body, a 1-flow-control water gap device, a 2-plug body, a 3-external cross arm, a 4-signal connection joint device, a 5-signal transmission device, a 6-temperature processing and displaying instrument, a 7-temperature sensing element, a 8-thermocouple protective sleeve, a 9-temperature-measuring thermocouple, a 10-transition layer, a 11-plug body head, a 12-connecting screw rod, a 13-embedded nut, a 14-plug body internal conical surface, a 15-connecting screw rod connecting thread and a 16-connecting screw rod matching conical surface.
Detailed Description
As shown in fig. 1, fig. 2 and fig. 5, a novel device for continuous temperature measurement of high-temperature molten metal and control of steel flow size, including the equal open-ended mouth of a river device 1 of accuse at both ends, the inner chamber is hollow structure's stopper body 2, it has thermocouple 9 to insert in the cavity, 2 lower extreme fixedly connected with temperature-sensing element 7 of stopper body, stopper body 2 both ends openings, 7 one end openings of temperature-sensing element, one end is sealed, the open end forms inside intercommunication with stopper body 2 fixed connection, the stopper body 2 other end and connecting screw 12 conical surface threaded connection, it has transition layer 10 to fill between temperature-sensing element 7 and the stopper body 2, thermocouple 9 lower extreme is located inside temperature-sensing element 7. A transition layer 10 is arranged between the outer wall of the opening end of the temperature sensing element 7 and the inner wall of the stopper body head 11. The stopper rod body 2 is of a hollow structure and comprises a stopper rod used in a metallurgical continuous casting tundish process, a stopper rod used by casting die casting equipment and other various hollow structure devices playing a role in connection and support; the cambered surface of the head part 11 of the stopper rod body 2 is matched with the water gap device 1 to regulate and control the size of the molten steel flow in real time, meanwhile, the temperature sensing element 7 senses the temperature of the surrounding molten steel, converts the temperature into an electric signal through the temperature measuring thermocouple 9, and obtains the temperature value of the molten metal through the signal connection joint device 4 and the signal transmission device 5 and the temperature processing and displaying instrument 6.
Because the temperature sensing element 7 is made of special ceramic materials with high temperature resistance, scouring resistance and high thermal shock resistance, and the wall thickness is greatly reduced compared with that of the prior temperature measuring sensor, the temperature measuring thermal response time is greatly shortened, and the rapid and continuous temperature measurement of the temperature of high-temperature molten metal is realized by utilizing a mature thermocouple temperature measuring system; meanwhile, the function of controlling the size of the steel flow between the stopper rod body and the water gap is reserved, and finally, the dual functions of flow control and temperature measurement are achieved simultaneously.
Optionally, the ratio of the length L1 of the temperature sensing element 7 exposed out of the stopper body head 11 to the inner diameter D1 of the temperature sensing element 7 is L1/D1=0.5 ~.9999, and L1=5 ~ mm, for example, L1/D1 may be 0.5, 0.6, 0.7, 0.8, 0.9, 0.95, and L1 may be 5mm, 10mm, 15 mm, 20mm, or 25 mm.
Optionally, the inner diameter D1 of the temperature sensing element 7 is 13-28mm, and the outer diameter D2 is 17-37 mm. Under the condition of continuous casting of large square billets and small square billets with the inner diameter range of 22-45mm of the nozzle, the inner diameter D1 of the temperature sensing element 7 is preferably 10-20mm, and the outer diameter D2 is preferably 14-29 mm. For example: d1 is 10mm, 14 mm, 16 mm, 17 mm, 18mm, 19 mm, 20 mm; corresponding D2 is 15 mm, 19 mm, 20mm, 21 mm, 22 mm, 23 mm, 24 mm, 25mm, 26mm, and actual research shows that there is enough clearance between the outer diameter D2 and the flow control water gap, and the size of the clearance is determined by the steel passing amount, so the outer diameter D2 needs to be reasonably designed according to the inner diameter and the steel passing amount of the water gap on the metallurgical site, and the inner diameter D1 is determined according to the wall thickness of the temperature sensing element 7.
Optionally, the wall thickness d1 of the temperature sensing element 7 is 2.0 ~ 4.5.5 mm, for example, the wall thickness d1 of the temperature sensing element may be 2.0mm, 2.5 mm, 2.8 mm, 3.0mm, 3.5 mm, 4.5mm, etc. the wall thickness is related to the temperature measurement response speed of the temperature sensing element, the service life of the temperature sensing element, the safety of production, processing and use, through practical research, the wall thickness is less than 2mm, the temperature sensing element is easy to crack, difficult to process, and the service life is difficult to meet the requirements of customers, while the wall thickness is greater than 4.5mm, the temperature measurement response is slow, and in the service condition of the technical product, the service life of the temperature sensing element 7 is generally required to be within 20 hours, and multiple field tests prove that the temperature sensing element 7 is eroded to be between 1mm and 3mm, so that the requirements of all aspects are taken into consideration, the wall thickness of the temperature sensing element.
The ratio of the length L1 of the temperature sensing element 7 exposed out of the stopper rod body head 11 to the inner diameter D1 of the temperature sensing element 7 is L1/D1=0.5 ~ 0.9999.9999, and the exposed length L1=5 ~ 30 mm.
The inner diameter D1 of the temperature sensing element is 13-28mm, the outer diameter D2 is 17-37mm, and the wall thickness D1= 2.0 ~ 4.5.5 mm.
The inner diameter D1 of the temperature sensing element is 10-20mm, the outer diameter D2 is 14-29mm, and the wall thickness D1= 2.0 ~ 4.5.5 mm.
The length L2=5 ~ 80mm and the thickness d2=0.1-10mm of the transition layer.
The thermocouple protective sleeve is sleeved on the outer circumference of the temperature thermocouple, and the distance from the bottom end of the thermocouple protective sleeve to the inner wall of the bottom end of the temperature sensing element is 0.5-10 mm. The thermocouple protective sleeve is used for prolonging the service life of the thermocouple, and the temperature thermocouple 9 can be selected from one of B type and S type thermocouples but is not limited to the B type and the S type thermocouples.
The cavity of the stopper rod body 2 is internally provided with an embedded nut 13, and the stopper rod body 2, the temperature sensing element 7 and the embedded nut 13 are coaxial.
The thread 15 of the connecting screw rod 12 is connected with the built-in connecting nut 13 of the stopper rod body 2, and the conical surface of the connecting screw rod 12 is in axial conical surface fit with the conical surface structure 14 of the stopper rod body.
Optionally, the transition layer 10 has a length L2=5-80mm and a thickness d2 of 0.5-8 mm. For example: the length L2 of the transition layer may be 5mm, 20mm, 35 mm, 50 mm, 60mm, 80 mm; the thickness d2 is 0.5 mm, 1mm, 3mm, 5mm, 7mm, 8 mm. The transition layer 10 mainly solves the problem of stress crack caused by the difference of the thermal expansion coefficients of the temperature sensing element 7 and the stopper body head 11, plays a role in transition buffering, sealing and the like, and is a key technical characteristic for determining the application, and the material is composed of high-temperature quartz and other combined materials.
Optionally, the upper end of the embedded nut 13 arranged in the stopper rod body 2 is provided with a conical surface structure 14, the conical surface structure 14 is coaxial with the temperature sensing element 7, and the coaxial connection helps the thermocouple to be conveniently inserted into the inner hole of the temperature sensing element 7.
Optionally, the temperature sensing element 7 is made of a special ceramic material with high temperature resistance, erosion resistance and rapid heat conduction, and is formed by sintering metal powder and ceramic powder at a high temperature, and the constituent materials of the temperature sensing element include one or more of W, Mo, ZrO2, Al2O3 and Cr.
Optionally, the outer surfaces of the stopper body 2 and the temperature sensing element 7 are coated with an anti-oxidation coating material, and the anti-oxidation coating material can solve the problem of oxidation of the stopper body 2 and the temperature sensing element 7 in the manufacturing and using processes; the stopper rod body 2 and the temperature sensing element 7 are compounded, and a sealing connection mode can be set according to actual needs. For example: the screw thread connection, the high pressure extrusion, the high temperature binder is bonded one or more.
Optionally, the connecting screw 12 is connected by a connecting nut 13 built in the stopper rod body 2, and is axially and conically matched with the conical surface 14, so that a coaxial structure is formed between the connecting screw 12 and the temperature sensing element 7.
Optionally, the exhaust passages 2-1 are arranged on the stopper rod body 2, the number of the exhaust passages 2-1 is 1-100, the diameter of each exhaust passage 2-1 is 0.01-5mm, and the total flow area of the exhaust passages 2-1 is more than or equal to 1mm2The axis of the exhaust passage 2-1 is clamped with the axis of the stopper body 2The angle B is 10-80 deg.
The first embodiment is as follows: in actual use working conditions, the continuous casting tundish uses an air-permeable stopper rod site according to process requirements, in such a situation, an inclined exhaust channel is mainly arranged at the lower end of the stopper rod body 2 on the slab caster, the exhaust channel penetrates through the lower end face of the stopper rod body 2, the number of the exhaust channels is 1-100, the diameter of each channel is 0.01-5mm, and the total through flow area of the exhaust channel is more than or equal to 1mm2The included angle B between the axis of the exhaust channel and the axis of the stopper rod body is 10-80 degrees, the temperature sensing element 7 and the stopper rod body 2 are inserted into high-temperature molten metal, the head cambered surface 11 of the stopper rod body 2 and the flow control water gap device 1 are regulated and matched in real time to control the size of molten steel flow, meanwhile, the temperature sensing element 7 senses the temperature of surrounding molten steel, the temperature sensing element is converted into an electric signal through a temperature measuring thermocouple 9, and the temperature of the molten metal is obtained through a signal processing and displaying instrument 6 through a signal connecting joint device 4 and a signal transmission device 5.
In this embodiment, the inner diameter of the nozzle device is 45mm, the required service life of the device reaches 13 hours, the temperature sensing element 7 and the stopper body head 11 are extruded and composite molded by a cold isostatic press under a high pressure environment of 130MPa, the wall thickness D1 of the temperature sensing element 7 is 3.0mm, the inner diameter D1 is 20mm, the outer diameter D2 is 26mm, the length L1 of the exposed stopper body is 18mm, and the length-diameter ratio L1/D1 is 0.90; the length of the transition layer is L2=25mm, the thickness of the transition layer is d2=3mm, and the transition layer mainly comprises high-temperature quartz materials and the like. The embedded nut 13 is arranged in the stopper rod body 2, the upper end of the stopper rod body is provided with a conical surface structure 14, the conical surface structure 14 and the temperature sensing element 7 are coaxial, the conical degree of the conical surface is 1:10, and the length of the conical surface is 60 mm. In the using process, the threads 15 on the connecting screw 12 are in threaded fit with the embedded nuts 13 arranged in the stopper rod body 2, so that the fixed connection effect is achieved; meanwhile, the conical surface 16 on the connecting screw rod 12 has the taper size of 1:10 and the length of the conical surface of 56mm, and the conical surface is in conical coaxial fit with the conical surface structure 14 in the stopper rod body 2, so that the connecting screw rod 12 and the temperature sensing element 7 are ensured to be coaxial.
The temperature thermocouple 9 adopts a B-type double platinum rhodium industrial thermocouple, the thermocouple protective sleeve 8 is composed of alumina material with the content of 99 percent, the diameter, the length and the structure of the thermocouple protective sleeve are determined according to the actual situation on site, the insertion is ensured, and the pulling-out operation is convenient.
Example two: in actual use working conditions, a continuous casting tundish uses a non-air-permeable stopper rod on site according to process requirements, the stopper rod without air holes is selected on a bloom billet and a billet, an exhaust channel is not arranged at the lower end of the stopper rod, the temperature sensing element 7 and the stopper rod body 2 are inserted into high-temperature molten metal, the head cambered surface 11 of the stopper rod body 2 and the flow control nozzle device 1 are regulated and matched in real time to control the size of molten steel flow, meanwhile, the temperature sensing element 7 senses the temperature of surrounding molten steel, the temperature sensing element is converted into an electric signal through the temperature thermocouple 9, the electric signal passes through the signal connection joint device 4 and the signal transmission device 5, and the temperature processing and displaying instrument 6 obtains the temperature value of the molten metal. Embodiments refer to other embodiments.
What has been described above is merely a preferred embodiment of the invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several modifications and improvements can be made, and shall be considered as belonging to the protection scope of the present invention.
Claims (10)
1. A novel device for continuous temperature measurement of high temperature molten metal and control steel flow size, its characterized in that: equal open-ended accuse flow mouth of a river device (1) in both ends, the inner chamber is hollow structure's stopper rod body (2), it has temperature thermocouple (9) to insert in the cavity, stopper rod body (2) lower extreme fixedly connected with temperature-sensing element (7), stopper rod body (2) both ends opening, temperature-sensing element (7) one end opening, one end is sealed, the open end forms inside intercommunication with stopper rod body (2) fixed connection, stopper rod body (2) other end and connecting screw (12) conical surface cooperation, and it is fixed through threaded connection, it has transition layer (10) to fill between temperature-sensing element (7) and stopper rod body (2), temperature thermocouple (9) lower extreme is located inside temperature-sensing element (7).
2. The new device for continuous temperature measurement and control of the size of steel stream in hot metal according to claim 1, wherein the ratio of the length L1 of the head (11) of the stopper body exposed from the temperature sensing element (7) to the inner diameter D1 of the temperature sensing element (7) is L1/D1=0.5 ~ 0.9999.9999, and the exposed length L1=5 ~ 30 mm.
3. The new device for continuous temperature measurement and control of the flow of molten steel in high temperature according to claim 2, wherein the inner diameter D1 of the temperature sensing element (7) is 13-28mm, the outer diameter D2 is 17-37mm, and the wall thickness D1= 2.0 ~ 4.5.5 mm.
4. The new device for continuous temperature measurement and control of the flow of molten steel in high temperature according to claim 2, wherein the inner diameter D1 of the temperature sensing element (7) is 10-20mm, the outer diameter D2 is 14-29mm, and the wall thickness D1= 2.0 ~ 4.5.5 mm.
5. The new device for continuous temperature measurement of high temperature molten metal and controlling the size of steel flow as claimed in claim 1, wherein the length L2=5 ~ 80mm and the thickness d2=0.1-10mm of the transition layer (10).
6. The novel apparatus for continuous temperature measurement of high-temperature molten metal and controlling the size of a steel stream as claimed in claim 1, wherein: the outer circumference of the temperature thermocouple (9) is sleeved with a thermocouple protective sleeve (8), and the distance from the bottom end of the thermocouple protective sleeve (8) to the inner wall of the bottom end of the temperature sensing element (7) is 0.5-10 mm.
7. The novel apparatus for continuous temperature measurement of high-temperature molten metal and controlling the size of a steel stream as claimed in claim 1, wherein: the stopper rod is characterized in that an embedded nut (13) is arranged in a cavity of the stopper rod body (2), and the stopper rod body (2), the temperature sensing element (7) and the embedded nut (13) are coaxial.
8. The novel apparatus for continuous temperature measurement of high-temperature molten metal and controlling the size of a steel stream as claimed in claim 1, wherein: the thread (15) of the connecting screw rod (12) is connected with the embedded nut (13) arranged in the stopper rod body (2), and the conical surface of the connecting screw rod (12) is matched with the conical surface structure (14) of the stopper rod body in an axial conical surface mode.
9. The novel apparatus for continuous temperature measurement of high-temperature molten metal and controlling the size of a steel stream as claimed in claim 1, wherein: the outer surfaces of the stopper rod body (2) and the temperature sensing element (7) are coated with an anti-oxidation coating material; the temperature sensing element (7) is compounded with the stopper rod body (2) by one or more of extrusion, bonding and threaded connection.
10. The novel apparatus for continuous temperature measurement of high-temperature molten metal and controlling the size of a steel stream as claimed in claim 1, wherein: the stopper rod body (2) is provided with exhaust channels (2-1), the number of the exhaust channels (2-1) is 1-100, the diameter of each exhaust channel (2-1) is 0.01-5mm, and the total flow area of the exhaust channels (2-1) is more than or equal to 1mm2The included angle B between the axis of the exhaust channel (2-1) and the axis of the stopper rod body (2) is 10-80 degrees.
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| CN109773172A (en) * | 2019-03-16 | 2019-05-21 | 赵芬 | New device for high-temperature molten metal continuous temperature measurement and control steel stream size |
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| CN109773172A (en) * | 2019-03-16 | 2019-05-21 | 赵芬 | New device for high-temperature molten metal continuous temperature measurement and control steel stream size |
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