An online continuous detection device and method for immersion nozzle precision control

Abstract

The present invention relates to an online continuous detection device and method for the precision control of an immersion nozzle, and belongs to the technical field of continuous steel casting equipment and methods. The technical solution of the present invention is: a fixed bracket (1) is installed at the bottom of the cladding of a tundish (9); there are two rangefinders (2), namely a 1# laser rangefinder and a 2# laser rangefinder, which are installed on the fixed bracket (1); a positioning iron block (3) is installed on the copper plate pressure iron of the crystallizer, and the length direction is parallel to the wide copper plate of the crystallizer, and the vertical direction matches the position of the 1# laser rangefinder; a data collector (5) is connected to the rangefinder (2) and an electronic computer (6) respectively. The beneficial effects of the present invention are: the insertion depth and centering of the immersion nozzle can be monitored in real time, providing a strong basis for the optimization of the continuous casting process and the precise control of the process, and effectively improving the product quality.

Description

Technical Field

[0001] The invention relates to an online continuous detection device and method for precision control of an immersed nozzle, belonging to the technical field of continuous steel casting equipment and methods. Background Art

[0002] As the last core process of a steel mill, the submerged nozzle plays a key process control function in the process of converting liquid steel into solid billets. The precision control of the submerged nozzle not only directly affects the quality of the billet, but also has a key impact on the leakage accident. As a key functional component connected to the "heart" of the continuous casting machine - the crystallizer, the insertion depth and centering accuracy of the submerged nozzle directly affect the formation of the crystallizer flow field, and affect the metallurgical effect and function of the crystallizer. Therefore, the precision control of the submerged nozzle is still one of the key tasks of continuous casting workers. At present, the insertion depth of the submerged nozzle is mainly measured manually after the submerged nozzle is offline. According to the insertion depth of the first submerged nozzle, the insertion depth of the second submerged nozzle is adjusted. The centering of the submerged nozzle is also judged only by the naked eye, and it cannot be discovered in time when the middle ladle car is offset during the pouring process. The above operations seriously affect the precision control level of the submerged nozzle. When abnormal situations occur, they cannot be effectively tracked, analyzed, and verified. Real-time detection and control of the accuracy of submerged nozzles are of great significance to both academic research and industrial practice.

[0003] Through patent search at the Intellectual Property Office, it was found that there is currently no online continuous detection patent for the precision control of submerged nozzles. At present, the patents related to the precision control of submerged nozzles are mainly divided into two categories. One category is patents for the centering of submerged nozzles, such as CN208929207U and CN207026473U; the other category is patents for the measurement of the insertion depth of submerged nozzles, such as CN210188436U and CN208033603U. These patents have the following problems: 1) Among all the published patents, no patent can realize the online continuous detection of the insertion depth and centering of submerged nozzles at the same time through a device. 2) The patents related to the centering of submerged nozzles mainly use various templates or rulers as the main body, which inevitably come into contact with the submerged nozzle during the measurement process. There is a risk that the submerged nozzle will be stressed during the centering process, which poses a potential accident hazard. And in all the centering patents, online continuous detection cannot be achieved. 3) Patents related to the insertion depth of submerged nozzles mainly use rulers as the main body for measurement. Some patents involve making specific rulers, some directly making the submerged nozzles into rulers, and some use the hydraulic cylinder of the tundish car as a ruler. The specific ruler has the problem of being unable to measure continuously online. Using the submerged nozzle itself as a ruler will cause the thickness of the protective slag to interfere with the insertion depth, and manual secondary measurement and calculation are required. The measurement method using the hydraulic cylinder of the tundish car as a ruler is affected by the deviation of different tundishes and sitting tundishes, the displacement deviation after the tundish car is raised and lowered, and the accuracy deviation of the hydraulic cylinder itself. In summary, although there are many patents on the precision control of submerged nozzles, all of them have great limitations. Summary of the invention

[0004] The object of the present invention is to provide an online continuous detection device and method for the precision control of an immersed water nozzle, which can monitor the insertion depth and centering of the immersed water nozzle in real time, provide a strong basis for the optimization of the continuous casting process and the precise control of the process, and effectively improve product quality; big data research can be conducted on the quality conditions corresponding to different insertion depths, and an optimal immersed water nozzle insertion depth parameter window can be established, thereby improving the quality control capability and effectively solving the above-mentioned problems existing in the background technology.

[0005] The technical solution of the present invention is: an online continuous detection device for immersion nozzle precision control, comprising a fixed bracket, a rangefinder, a positioning iron block, a data collector, an electronic computer, an immersion nozzle precision control calculation software package and an anti-scalding and high-temperature resistant cable, wherein the fixed bracket is installed at the bottom of the cladding of the tundish; there are two rangefinders, namely 1# laser rangefinder and 2# laser rangefinder, which are installed on the fixed bracket; the positioning iron block is installed on the copper plate pressure iron of the crystallizer, and the length direction is parallel to the wide copper plate of the crystallizer, and the vertical direction matches the position of the 1# laser rangefinder; the input end of the data collector is connected to the rangefinder through the anti-scalding and high-temperature resistant cable, and the output end of the data collector is connected to the electronic computer, and the immersion nozzle precision control calculation software package is set in the electronic computer.

[0006] The fixed bracket is installed at the bottom of the shell of the tundish by bolt connection; a level ruler is provided on the fixed bracket, and the horizontality of the fixed bracket is adjusted by adjusting the connecting bolts; two installation positions for installing a rangefinder are provided on the fixed bracket, and the connecting line of the two installation positions is parallel to the width direction of the crystallizer, and the side-by-side spacing is greater than the length of the positioning iron block.

[0007] The length and width dimensions of the positioning iron block respectively match the water nozzle centering accuracy requirements in the width direction and thickness direction of the crystallizer, and the thickness dimension of the positioning iron block matches the water nozzle insertion depth accuracy control requirements; the center of the upper surface of the positioning iron block is coated with a fluorescent dot with a diameter of 2mm.

[0008] It also includes a permanent magnet, which is arranged between the positioning iron block and the copper plate pressure iron of the crystallizer. The positioning iron block is fixed by the permanent magnet, and the length and width of the permanent magnet are respectively smaller than the length and width of the positioning iron block.

[0009] An iron sheet protective cover is arranged outside the fixing bracket, and a cooling air duct is introduced into the cover.

[0010] The submerged nozzle precision control calculation software package is connected with an alarm system.

[0011] The submerged nozzle precision control calculation software package is connected to the casting machine PLC.

[0012] The anti-scalding and high-temperature resistant cable and the rangefinder are connected via a quick connector.

[0013] An online continuous detection method for immersion nozzle precision control comprises the following steps:

[0014] (1) Before production, install the fixed bracket at a suitable position at the bottom of the tundish shell, adjust the connecting bolts to level the fixed bracket, install the 1# laser rangefinder and the 2# laser rangefinder on the fixed bracket, and adjust the installation height of the two rangefinders so that the heads of the two rangefinders are on the same horizontal line;

[0015] (2) Measure the total length L of the submerged nozzle S , the distance a from the head of the 1# laser rangefinder to the bottom of the tundish, the height b of the positioning iron block, the thickness c of the permanent magnet, the thickness d of the mold iron pressure, the distance e from the surface of the immersion nozzle slide to the bottom of the tundish, and the distance f from the upper edge of the immersion nozzle side hole to the bottom;

[0016] (3) Open the tundish to the pouring position, manually use a tape measure to adjust the submerged nozzle alignment, so that the alignment accuracy meets the standard requirements, and then use a permanent magnet to adsorb the positioning iron block on the copper plate pressure iron of the crystallizer. Adjust the position of the positioning iron block so that the laser spot of the 1# laser rangefinder is located within the fluorescent dot at the center of the upper surface of the positioning iron block;

[0017] (4) Connect the rangefinder to the data collector through a high-temperature anti-scalding cable, and the data collector to the computer;

[0018] (5) The 1# laser rangefinder measures the distance L1 between the bottom of the tundish and the positioning iron block; the laser of the 2# laser rangefinder hits the copper plate pressure iron of the crystallizer to measure the distance L2 between the bottom of the tundish and the copper plate pressure iron of the crystallizer; by calculating L2-L1=(b+c)±3mm, the alignment of the immersion nozzle is monitored. When the immersion nozzle is abnormally aligned, an alarm is issued and the alarm information is transmitted to the voice broadcast system to prompt the post to make adjustments;

[0019] (6) Calculate in real time the distance from the upper edge of the side hole of the submerged nozzle to the molten steel surface of the crystallizer, that is, the insertion depth D of the submerged nozzle, using the formula:

[0020] D = (L S +e)-(a+L 1 +b+c+d+h)-f

[0021] Where h is the height from the molten steel level in the crystallizer to the upper edge of the crystallizer copper plate, and h is the measured value of the crystallizer liquid level automatic control system;

[0022] The immersion nozzle precision control calculation software package performs online dynamic judgment on whether the immersion nozzle insertion depth meets the requirements. When the immersion nozzle insertion depth does not meet the requirements, a warning signal is issued and the lifting system of the trolley is controlled to make adjustments.

[0023] (7) When the tundish is offline, unplug the anti-scalding and high-temperature resistant cables and cooling air ducts.

[0024] The beneficial effects of the present invention are: it can monitor the insertion depth and centering of the submerged nozzle in real time, provide a strong basis for the optimization of the continuous casting process and the precise control of the process, and effectively improve product quality; it can conduct big data research on the quality conditions corresponding to different insertion depths, establish the optimal submerged nozzle insertion depth parameter window, and improve the quality control capability. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a front view of the present invention;

[0026] Figure 2 is a side view of the present invention;

[0027] In the figure: fixed bracket 1, distance meter 2, positioning iron block 3, permanent magnet 4, data acquisition device 5, electronic computer 6, immersion nozzle precision control calculation software package 7, anti-scalding and high temperature resistant cable 8, tundish 9, crystallizer upper mouth 10, distance from crystallizer upper mouth to steel liquid surface 11, steel liquid surface 12, insertion depth 13, immersion nozzle 14, crystallizer 15. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the invention implementation cases clearer, the technical solutions in the implementation cases of the present invention will be clearly and completely described below in conjunction with the drawings in the implementation cases. Obviously, the implementation cases described are only a small part of the implementation cases of the present invention, rather than all the implementation cases. Based on the implementation cases in the present invention, all other implementation cases obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0029] An online continuous detection device for immersion nozzle precision control comprises a fixed bracket 1, a rangefinder 2, a positioning iron block 3, a data collector 5, an electronic computer 6, an immersion nozzle precision control calculation software package 7 and an anti-scalding and high-temperature resistant cable 8, wherein the fixed bracket 1 is installed at the bottom of the shell of a tundish 9; there are two rangefinders 2, namely a 1# laser rangefinder and a 2# laser rangefinder, which are installed on the fixed bracket 1; the positioning iron block 3 is installed on the copper plate pressure iron of the crystallizer, with the length direction being parallel to the wide copper plate of the crystallizer and the vertical direction matching the position of the 1# laser rangefinder; the input end of the data collector 5 is connected to the rangefinder 2 through the anti-scalding and high-temperature resistant cable 8, and the output end of the data collector 5 is connected to the electronic computer 6, and the immersion nozzle precision control calculation software package 7 is arranged in the electronic computer 6.

[0030] The fixed bracket 1 is installed at the bottom of the shell of the tundish 9 by bolt connection; a level ruler is provided on the fixed bracket 1, and the horizontality of the fixed bracket is adjusted by adjusting the connecting bolts; two installation positions for installing the rangefinder 2 are provided on the fixed bracket 1, and the connecting line of the two installation positions is parallel to the width direction of the crystallizer 15, and the side-by-side spacing is greater than the length of the positioning iron block 3.

[0031] The length and width dimensions of the positioning iron block 3 match the water inlet centering accuracy requirements in the width direction and thickness direction of the crystallizer 15 respectively, and the thickness dimension of the positioning iron block 3 matches the water inlet insertion depth accuracy control requirements; the center of the upper surface of the positioning iron block 3 is coated with a fluorescent dot with a diameter of 2 mm.

[0032] It also includes a permanent magnet 4, which is arranged between the positioning iron block 3 and the copper plate pressure iron of the crystallizer. The positioning iron block 3 is fixed by the permanent magnet 4, and the length and width of the permanent magnet 4 are respectively smaller than the length and width of the positioning iron block.

[0033] The fixing bracket 1 is provided with an iron sheet protective cover on the outside, through which a cooling air duct is introduced.

[0034] The submerged nozzle precision control calculation software package 7 is connected to an alarm system.

[0035] The submerged nozzle precision control calculation software package 7 is connected to the casting machine PLC.

[0036] The anti-scalding and high temperature resistant cable 8 and the rangefinder 2 are connected via a quick connector.

[0037] An online continuous detection method for immersion nozzle precision control comprises the following steps:

[0038] (1) Before production, install the fixed bracket at a suitable position at the bottom of the tundish shell, adjust the connecting bolts to level the fixed bracket, install the 1# laser rangefinder and the 2# laser rangefinder on the fixed bracket, and adjust the installation height of the two rangefinders so that the heads of the two rangefinders are on the same horizontal line;

[0039] (2) Measure the total length L of the submerged nozzle S , the distance a from the head of the 1# laser rangefinder to the bottom of the tundish, the height b of the positioning iron block, the thickness c of the permanent magnet, the thickness d of the mold iron pressure, the distance e from the surface of the immersion nozzle slide to the bottom of the tundish, and the distance f from the upper edge of the immersion nozzle side hole to the bottom;

[0040] (3) Open the tundish to the pouring position, manually use a tape measure to adjust the submerged nozzle alignment, so that the alignment accuracy meets the standard requirements, and then use a permanent magnet to adsorb the positioning iron block on the copper plate pressure iron of the crystallizer. Adjust the position of the positioning iron block so that the laser spot of the 1# laser rangefinder is located within the fluorescent dot at the center of the upper surface of the positioning iron block;

[0041] (4) Connect the rangefinder to the data collector through a high-temperature anti-scalding cable, and the data collector to the computer;

[0042] (5) The 1# laser rangefinder measures the distance L1 between the bottom of the tundish and the positioning iron block; the laser of the 2# laser rangefinder hits the copper plate pressure iron of the crystallizer to measure the distance L2 between the bottom of the tundish and the copper plate pressure iron of the crystallizer; by calculating L2-L1=(b+c)±3mm, the alignment of the immersion nozzle is monitored. When the immersion nozzle is abnormally aligned, an alarm is issued and the alarm information is transmitted to the voice broadcast system to prompt the post to make adjustments;

[0043] (6) Calculate in real time the distance from the upper edge of the side hole of the submerged nozzle to the molten steel surface of the crystallizer, that is, the insertion depth D of the submerged nozzle, using the formula:

[0044] D = (L S +e)-(a+L 1 +b+c+d+h)-f

[0045] Where h is the height from the molten steel level in the crystallizer to the upper edge of the crystallizer copper plate, and h is the measured value of the crystallizer liquid level automatic control system;

[0046] The immersion nozzle precision control calculation software package performs online dynamic judgment on whether the immersion nozzle insertion depth meets the requirements. When the immersion nozzle insertion depth does not meet the requirements, a warning signal is issued and the lifting system of the trolley is controlled to make adjustments.

[0047] (7) When the tundish is offline, unplug the anti-scalding and high-temperature resistant cables and cooling air ducts.

[0048] In practical application, the present invention is adopted, and the specific process is as follows:

[0049] Step 1: Install the fixed bracket at the bottom of the tundish shell. Its position is: 500mm to the right of the center line of the immersed nozzle and 107.5mm backward from the pouring direction. The positioning point is based on the position of the signal emission point measured by the 1# rangefinder.

[0050] Step 2: Install two distance meters on the fixed bracket. The line connecting the two installation positions is parallel to the width direction of the crystallizer, and the side-by-side spacing is 20 mm.

[0051] Step 3: Install the positioning iron block on the pressure plate on the upper edge of the copper plate on the fixed side of the crystallizer. Its position is: from the casting direction, it is the upper edge of the corresponding fixed copper plate 500mm to the right of the center line of the crystallizer. The positioning point is the center point of the positioning iron block, so that the edge of the positioning iron block is flush with the copper plate coating side of the crystallizer. The size of the point iron block is 10mm long, 4mm wide, and 20mm thick. The allowable dimensional processing error is ≤±0.5mm, and the surface roughness is ≤50μm. Apply a 2mm diameter fluorescent dot in the center of the point iron block as the calibration origin.

[0052] Step 4: After the tundish is put online, connect the anti-scalding and high-temperature resistant cables, cover with the iron protective cover, and connect the cooling air duct.

[0053] Step 5: Open the tundish to the pouring position, and manually use a tape measure to adjust the submerged nozzle alignment so that the alignment accuracy meets the requirements of ±1mm in the width direction of the ingot and ±1mm in the thickness direction of the ingot. If the progress requirements cannot be met, fine-tune the rangefinder to meet the accuracy requirements. Use a permanent magnet to adsorb the positioning iron block on the pressure iron on the upper edge of the crystallizer copper plate, and adjust the position of the positioning iron block so that the laser spot of the 1# laser rangefinder is located in the fluorescent dot at the center of the upper surface of the positioning iron block. The length and width of the permanent magnet are smaller than the length and width of the positioning iron block, respectively. The size of the permanent magnet is 8mm long, 3mm wide, and 5mm thick. The allowable dimensional processing error is ≤±0.5mm, and the surface roughness is ≤50μm.

[0054] Step 6: The total length of the submerged nozzle L S , the distance a from the head of 1# distance meter to the bottom of the middle bag, the height b of the positioning iron block, the thickness c of the permanent magnet, the thickness d of the crystallizer iron pressure, the distance e from the slide surface of the immersion nozzle to the bottom of the middle bag, and the distance f from the upper edge of the immersion nozzle side hole to the bottom are input into the operation interface.

[0055] Step 7: The rangefinder collects and measures the insertion depth and centering of the immersion nozzle in real time, and transmits the data to the computer for storage or online automatic calculation. The calculated insertion depth of the immersion nozzle is transmitted to the casting machine PLC to adjust the insertion depth of the immersion nozzle. By monitoring L2-L1=(b+c)±3mm, the immersion nozzle is monitored for centering. When the immersion nozzle is abnormally centered, an alarm is issued, and the alarm information is transmitted to the voice broadcast system to prompt the position to make adjustments.

[0056] Step 8: When the tundish is offline, unplug the anti-scalding and high-temperature resistant cables and cooling air ducts.

[0057] Embodiment 1:

[0058] The application was carried out on a domestically produced single-stream slab with a thickness of 200mm and a width of 800-1600mm. The test steel type was SPHC low-carbon steel with a cross section of 1015mm. The immersion nozzle insertion depth was required to be 160mm and the immersion nozzle was required to be centered. The immersion nozzle precision control online continuous detection device provided by the present invention was used for testing. The specific implementation method is as follows:

[0059] Step 1: Install the fixed bracket at the bottom of the tundish shell. Its position is: 500mm to the right of the center line of the immersed nozzle and 107.5mm backward from the pouring direction. The positioning point is based on the position of the signal emission point measured by the 1# rangefinder.

[0060] Step 2: Install the two rangefinders on the fixed bracket.

[0061] Step 3: Install the locator on the pressure plate on the upper edge of the copper plate on the fixed side of the crystallizer. Its position is: from the casting direction, it is the upper edge of the copper plate on the corresponding fixed side 500mm to the right of the center line of the crystallizer. The positioning point is the center point of the locator, so that the edge of the locator is flush with the copper plated side of the crystallizer.

[0062] Step 4: After the tundish is online, connect the anti-scalding and high-temperature resistant cables, cover the protective cover, and connect the cooling air duct.

[0063] Step 5: Open the tundish to the pouring position, and manually use a tape measure to adjust the submerged nozzle centering. The centering accuracy is 452mm on the left and 452mm on the right in the width direction, 46mm on the fixed side and 45mm on the loose side in the thickness direction of the ingot. Use a permanent magnet to adsorb the positioning iron block on the pressure iron on the upper edge of the crystallizer copper plate, and adjust the position of the positioning iron block so that the laser spot of the 1# laser rangefinder is located within the fluorescent dot at the center of the upper surface of the positioning iron block.

[0064] Step 6: The total length of the submerged nozzle L S =825mm, the distance from the head of 1# distance meter to the bottom of the middle bag a=35mm, the height of the positioning iron block b=20mm, the thickness of the permanent magnet c=5mm, the thickness of the crystallizer pressure iron d=35mm, the distance from the surface of the immersion nozzle slide to the bottom of the middle bag e=54mm, the distance from the upper edge of the immersion nozzle side hole to the bottom f=706mm input operation interface.

[0065] Step 7: The rangefinder collects and measures the insertion depth and centering of the immersion nozzle in real time, and transmits the data to the computer for storage or online automatic calculation. The calculated insertion depth of the immersion nozzle is transmitted to the casting machine PLC to adjust the insertion depth of the immersion nozzle. By monitoring L2-L1=(b+c)±3mm, the immersion nozzle is monitored for centering. When the immersion nozzle is abnormally centered, an alarm is issued, and the alarm information is transmitted to the voice broadcast system to prompt the position to make adjustments.

[0066] Step 8: When the tundish is offline, unplug the anti-scalding and high-temperature resistant cables and cooling air ducts.

[0067] The insertion depth of the submerged nozzle of the lower line was measured and the result was 160mm, which was consistent with the set value of 160mm. At the same time, the continuous detection of the submerged nozzle centering was effectively solved.

[0068] After using the online continuous detection device for precision control of submerged nozzles provided by the present invention, the production of SPHC steel grades of the continuous casting machine was tracked and counted, and the compliance rate of the insertion depth of the submerged nozzles was increased from 67.3% to 96%. The compliance rate of the submerged nozzle centering was increased from 12.5% ​​to 96%. The proportion of hot rolling slag inclusions was reduced from 0.78% to 0.42%. After using the online continuous detection device and detection method for precision control of submerged nozzles provided by the present invention, the process compliance of the precision control of the SPHC submerged nozzles of a domestic single-strand slab continuous casting machine has been significantly improved, and the quality control level has also been significantly improved.

[0069] Embodiment 2:

[0070] The application was carried out on an imported single-stream slab with a thickness of 200 mm and a width of 800-1600 mm. The test steel type was IF steel SPHE-Ti, which has a "zero tolerance" for slag inclusion defects, and the test section was 1200 mm. The immersion nozzle insertion depth was required to be 160 mm and the immersion nozzle was centered. The immersion nozzle precision control online continuous detection device provided by the present invention was used for testing, and the specific implementation method is as follows:

[0071] Step 1: Install the fixed bracket at the bottom of the tundish shell. Its position is: 500mm to the right of the center line of the immersed nozzle and 107.5mm backward from the pouring direction. The positioning point is based on the position of the signal emission point measured by the 1# rangefinder.

[0072] Step 2: Install the two rangefinders on the fixed bracket.

[0073] Step 3: Install the locator on the pressure plate on the upper edge of the copper plate on the fixed side of the crystallizer. Its position is: from the casting direction, it is the upper edge of the copper plate on the corresponding fixed side 500mm to the right of the center line of the crystallizer. The positioning point is the center point of the locator, so that the edge of the locator is flush with the copper plated side of the crystallizer.

[0074] Step 4: After the tundish is put online, connect the anti-scalding and high-temperature resistant cables, cover with the iron protective cover, and connect the cooling air duct.

[0075] Step 5: Open the tundish to the pouring position, and manually use a tape measure to adjust the submerged nozzle centering. The centering accuracy is 546mm on the left side and 546mm on the right side in the width direction, 46mm on the fixed side and 45mm on the loose side in the thickness direction of the ingot. Use a permanent magnet to adsorb the positioning iron block on the pressure iron on the upper edge of the crystallizer copper plate, and adjust the position of the positioning iron block so that the laser spot of the 1# laser rangefinder is located within the fluorescent dot at the center of the upper surface of the positioning iron block.

[0076] Step 6: The total length of the submerged nozzle L S=825mm, the distance from the head of 1# distance meter to the bottom of the middle bag a=35mm, the height of the positioning iron block b=20mm, the thickness of the permanent magnet c=5mm, the thickness of the crystallizer pressure iron d=35mm, the distance from the surface of the immersion nozzle slide to the bottom of the middle bag e=54mm, the distance from the upper edge of the immersion nozzle side hole to the bottom f=706mm input operation interface.

[0077] Step 7: The rangefinder collects and measures the insertion depth and centering of the immersion nozzle in real time, and transmits the data to the computer for storage or online automatic calculation. The calculated insertion depth of the immersion nozzle is transmitted to the casting machine PLC to adjust the insertion depth of the immersion nozzle. By monitoring L2-L1=(b+c)±3mm, the immersion nozzle is monitored for centering. When the immersion nozzle is abnormally centered, an alarm is issued, and the alarm information is transmitted to the voice broadcast system to prompt the position to make adjustments.

[0078] Step 8: When the tundish is offline, unplug the anti-scalding and high-temperature resistant cables and cooling air ducts.

[0079] The insertion depth of the submerged nozzle of the lower line was measured and the result was 160mm, which was consistent with the set value of 160mm. At the same time, the continuous detection of the submerged nozzle centering was effectively solved.

[0080] After using the online continuous detection device for precision control of submerged nozzles provided by the present invention, the production of SPHE-Ti steel of the continuous casting machine was tracked and counted, and the compliance rate of the insertion depth of the submerged nozzles was increased from 55.3% to 98%. The compliance rate of the centering of the submerged nozzles was increased from 20.5% to 98%. The proportion of hot rolling slag inclusions was reduced from 12.3% to 7.2%. After using the online continuous detection device and detection method for precision control of submerged nozzles provided by the present invention, the process compliance of the precision control of the submerged nozzles of SPHE-Ti of a certain imported single-stream slab continuous casting machine has been significantly improved, and the quality control level has also been significantly improved.

[0081] After using the online continuous detection device and detection method for immersion water nozzle precision control provided by the present invention, big data research on quality conditions corresponding to different insertion depths can be performed, and an optimal immersion water nozzle insertion depth parameter window can be established to improve quality control capabilities.

[0082] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. An online continuous detection method for immersion nozzle precision control, It is characterized in that The detection device used comprises a fixed support (1), a distance meter (2), a positioning iron block (3), a data acquisition device (5), an electronic computer (6), an immersion nozzle precision control calculation software package (7) and an anti-scalding and high temperature resistant cable (8), wherein the fixed support (1) is installed at the bottom of the cladding of the tundish (9); there are two distance meters (2), namely a 1# laser distance meter and a 2# laser distance meter, which are installed on the fixed support (1); the positioning iron block (3) is installed on the copper plate pressure iron of the crystallizer, and its length direction is parallel to the wide copper plate of the crystallizer, and its vertical direction matches the position of the 1# laser distance meter; the input end of the data acquisition device (5) is connected to the distance meter (2) through the anti-scalding and high temperature resistant cable (8), the output end of the data acquisition device (5) is connected to the electronic computer (6), and the immersion nozzle precision control calculation software package (7) is set in the electronic computer (6); the detection method comprises the following steps: (1) Before production, install the fixed bracket at a suitable position at the bottom of the tundish shell, adjust the connecting bolts to level the fixed bracket, install the 1# laser rangefinder and the 2# laser rangefinder on the fixed bracket, and adjust the installation height of the two rangefinders so that the heads of the two rangefinders are on the same horizontal line; (2) Measure the total length L of the submerged nozzle S , the distance a from the head of the 1# laser rangefinder to the bottom of the tundish, the height b of the positioning iron block, the thickness c of the permanent magnet, the thickness d of the mold iron pressure, the distance e from the surface of the immersion nozzle slide to the bottom of the tundish, and the distance f from the upper edge of the immersion nozzle side hole to the bottom; (3) Open the tundish to the pouring position, manually use a tape measure to adjust the submerged nozzle alignment, so that the alignment accuracy meets the standard requirements, and then use a permanent magnet to adsorb the positioning iron block on the copper plate pressure iron of the crystallizer. Adjust the position of the positioning iron block so that the laser spot of the 1# laser rangefinder is located within the fluorescent dot at the center of the upper surface of the positioning iron block; (4) Connect the rangefinder to the data collector through a high-temperature anti-scalding cable, and the data collector to the computer; (5) The 1# laser rangefinder measures the distance L1 between the bottom of the tundish and the positioning iron block; the laser of the 2# laser rangefinder hits the copper plate pressure iron of the crystallizer to measure the distance L2 between the bottom of the tundish and the copper plate pressure iron of the crystallizer; the alignment of the immersion nozzle is monitored by calculating L2-L1=(b+c)±3mm; (6) Calculate in real time the distance from the upper edge of the side hole of the submerged nozzle to the molten steel surface of the crystallizer, that is, the insertion depth D of the submerged nozzle, using the formula: D=(L S +e)-(a+L 1 +b+c+d+h)-f Where h is the height from the molten steel level in the crystallizer to the upper edge of the crystallizer copper plate, and h is the measured value of the crystallizer liquid level automatic control system; (7) The immersion nozzle precision control calculation software package performs online dynamic judgment on whether the immersion nozzle centering accuracy and insertion depth meet the requirements. When the immersion nozzle centering accuracy does not meet the requirements, a warning signal is issued; when the immersion nozzle insertion depth does not meet the requirements, a warning signal is issued and the lifting system of the trolley is controlled to make adjustments; (8) When the tundish is offline, unplug the power cables and data cables.

2. According to claim 1, an online continuous detection method for precision control of an immersion nozzle, Features: The fixed support (1) is installed at the bottom of the shell of the tundish (9) by bolt connection; a level ruler is provided on the fixed support (1), and the horizontality of the fixed support is adjusted by adjusting the connecting bolts; two installation positions for installing the distance meter (2) are provided on the fixed support (1), and the connecting line of the two installation positions is parallel to the width direction of the crystallizer (15), and the side-by-side spacing is greater than the length of the positioning iron block (3).

3. According to claim 1, an online continuous detection method for precision control of an immersion nozzle, Features: The length and width dimensions of the positioning iron block (3) respectively match the nozzle centering accuracy requirements in the width direction and thickness direction of the crystallizer (15), and the thickness dimension of the positioning iron block (3) matches the nozzle insertion depth accuracy control requirements; the center of the upper surface of the positioning iron block (3) is coated with a fluorescent dot with a diameter of 2 mm.

4. According to claim 1, an online continuous detection method for precision control of an immersion nozzle, Features: It also comprises a permanent magnet (4), which is arranged between the positioning iron block (3) and the copper plate pressing iron of the crystallizer, and the positioning iron block (3) is fixed by the permanent magnet (4), and the length and width of the permanent magnet (4) are respectively smaller than the length and width of the positioning iron block.

5. According to claim 1, an online continuous detection method for precision control of an immersion nozzle, Features: The fixed bracket (1) is provided with an iron sheet protective cover on the outside, through which a cooling air duct is passed.

6. The online continuous detection method for precision control of an immersion nozzle according to claim 1, Features: The submerged nozzle precision control calculation software package (7) is connected to an alarm system.

7. The online continuous detection method for precision control of an immersion nozzle according to claim 1, Features: The submerged nozzle precision control calculation software package (7) is connected to the casting machine PLC.

8. The online continuous detection method for precision control of an immersion nozzle according to claim 1, Features: The anti-scalding and high temperature resistant cable (8) and the distance meter (2) are connected via a quick connector.

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