CN111649649A - Online measuring device and replacement prediction method for outer diameter of continuous casting long sleeve - Google Patents
Online measuring device and replacement prediction method for outer diameter of continuous casting long sleeve Download PDFInfo
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- CN111649649A CN111649649A CN202010304950.9A CN202010304950A CN111649649A CN 111649649 A CN111649649 A CN 111649649A CN 202010304950 A CN202010304950 A CN 202010304950A CN 111649649 A CN111649649 A CN 111649649A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/08—Measuring arrangements characterised by the use of mechanical techniques for measuring diameters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/006—Continuous casting of metals, i.e. casting in indefinite lengths of tubes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D2/00—Arrangement of indicating or measuring devices, e.g. for temperature or viscosity of the fused mass
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
- G06F17/11—Complex mathematical operations for solving equations, e.g. nonlinear equations, general mathematical optimization problems
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Abstract
The invention relates to a replacement prediction method for online measurement of the outer diameter of a continuous casting long sleeve, which comprises the following steps: time is taken as the X axis and the unit is the furnace; the ratio of the measured outer diameter dimension to the original dimension is Y axis, and the unit is; the outer diameter of the sleeve before use is marked as (0, 1) on the coordinate axis; when the first furnace of continuous casting is finished, recording the first casting time, and measuring the ratio of the first outer diameter dimension to the original dimension by using a measuring device to obtain a second coordinate point; repeating the first measurement when the second furnace is finished to obtain a third coordinate point; step four, calculating a change equation of the outer diameter size of the sleeve according to the three coordinate points: y ═ KX2-KX +1, according to the formulaAnd obtaining the X value from the Y value under the casting safety condition. The prediction method is to deduce the change of the outer diameter size of the long sleeve by combining the data measured by the device with a mathematical method, and improve the use times of the continuous casting long sleeve on the premise of ensuring the production safety.
Description
Technical Field
The invention belongs to the technical field of continuous casting production, and particularly relates to an online measuring device and a replacement prediction method for the outer diameter of a continuous casting long sleeve.
Background
In the continuous casting process, molten steel flows from a ladle to a section of a tundish, the molten steel is in a naked state, the temperature is reduced by about 80-100 ℃, and a secondary oxidation phenomenon exists, so that continuous casting operation and steel quality are influenced. At present, a zirconium carbon long nozzle is used as a protective sleeve, and molten steel enters a tundish from a ladle through the long sleeve in the continuous casting production process. In order to slow down the temperature drop of the molten steel in the tundish, a covering agent needs to be added on the surface of the molten steel, and the covering agent can erode the long sleeve. The working time of the long sleeve reaches hundreds to thousands of minutes, the wall thickness of the long sleeve becomes thinner and thinner along with the increase of the pouring time, the strength is not enough to support pouring, the failure condition occurs, and the production accident is caused. Because the working temperature of the long sleeve is more than 1500 ℃, the existing detection tool can only measure after the long sleeve is cooled off line, and the connection part is cooled after the long sleeve is cooled off line, so that the safety and quality risks exist in reuse.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide an online measuring device and a replacement predicting method for the outer diameter of a continuous casting long casing in view of the above prior art, wherein the outer diameter of the continuous casting long casing is measured online at a high temperature, and a replacement time node of the long casing is calculated according to the measurement result, so that the use efficiency of the long casing is improved and the waste is reduced on the premise of ensuring the safe production.
The technical scheme adopted by the invention for solving the problems is as follows: a replacement prediction method for online measurement of the outer diameter of a continuous casting long sleeve is characterized by comprising the following steps: the method comprises the following steps:
step one, determining a rectangular coordinate system
Time is taken as the X axis and the unit is the furnace; the ratio of the measured outer diameter dimension to the original dimension is Y axis, and the unit is; the outer diameter of the sleeve before use is marked as (0, 1) on the coordinate axis;
step two, carrying out the first casing measurement
When the first furnace of continuous casting is finished, recording the first casting time as the coordinate value of an X axis, and measuring the ratio of the first outer diameter dimension to the original dimension as the coordinate value of a Y axis by using a measuring device to obtain a second coordinate point;
step three, carrying out second casing pipe measurement
When the second furnace pouring is finished, recording the second pouring time as the coordinate value of the X axis, and measuring the ratio of the second outer diameter dimension to the original dimension as the coordinate value of the Y axis by using a measuring device to obtain a third coordinate point;
step four, obtaining a change equation of the outer diameter size of the sleeve
And (3) calculating a change equation of the outer diameter size of the sleeve according to the three coordinate points:
Y＝-KX2-KX+1
wherein: k is a constant obtained according to the three coordinate points, and an X value is obtained according to a Y value under the continuous casting safety condition, namely, the fact that the sleeve needs to be replaced when the furnace is finished is predicted.
Preferably, after the equation of the change of the outer diameter of the casing is obtained in the fourth step, a measurement is added to verify the equation, if the equation is established, correction is not needed, and if the equation is not established, the equation is solved again to obtain the value X.
Preferably, measuring device includes support frame, benchmark pole, carriage release lever and scale, the support frame is from sleeve pipe safe distance parallel arrangement, benchmark pole and support frame vertical fixation, the carriage release lever is the L type, and one side is perpendicular with the benchmark pole, and relative slidable arranges, another side and benchmark pole parallel arrangement, the scale is fixed to be set up between the two parallel sides of benchmark pole and carriage release lever, and mutually perpendicular, forms the U type bayonet socket of adjustable opening size, U type bayonet socket is used for blocking the sleeve pipe and measures the position.
Compared with the prior art, the invention has the advantages that:
the prediction method of the invention is to deduce the change of the external diameter size of the long sleeve by combining the data measured by the device with a mathematical method, and improve the use times of the continuous casting long sleeve on the premise of ensuring the production safety.
Drawings
Fig. 1 is a schematic structural diagram of an online diameter measuring device for the outer diameter of a continuous casting long sleeve provided by the embodiment of the invention. Main body equipment in the figure: 1. a support frame; 2. a reference bar; 3. a travel bar; 4. a scale; 5. a U-shaped bayonet.
Fig. 2 is a plane coordinate diagram of the continuous casting long casing outer diameter online diameter measurement replacement prediction method provided by the embodiment of the invention. Wherein the X-axis is the working time of the long sleeve in the unit of the furnace, and the Y-axis is the ratio of the measured outer diameter dimension to the original dimension in the unit of%.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
As shown in figure 1, the invention relates to an online measuring device for the external diameter of a continuous casting long sleeve, which comprises a support frame 1, a reference rod 2, a moving rod 3 and a scale 4, wherein the device is arranged at the position, close to the long sleeve, of a tundish car in continuous casting through the support frame 1, and the reference rod 2, the moving rod 3 and the scale 4 form a U-shaped bayonet capable of adjusting the opening size and used for clamping the position, to be measured, of the long sleeve.
The replacement prediction method based on the measuring device is as follows:
when the pouring of the first continuous casting furnace is finished, fixing a support frame near a continuous casting long sleeve pipe 1 m away from a high-temperature state by utilizing a quick-change steel ladle gap, clamping a position to be measured of the long sleeve pipe by using a U-shaped groove formed by a reference rod, a moving rod and a scale, supporting one end of the position to be measured by using the reference rod, moving the moving rod at the far end by using a handle to enable the moving rod to be attached to the other end of the position to be measured, reading the data of the moving rod on the scale, and recording the data on the coordinate in figure 2, wherein the number is (1, 0.99); repeating the operation when the pouring of the second furnace is finished to obtain (2, 0.97); according to the production process data, the erosion rate of the sleeve and the pouring time are in quadratic correspondence, and only when different steel grades are poured, the corrosion rate and the pouring time are in quadratic correspondenceThe quadratic equations should be different, so that Y is set to aX2+ bX + c, bringing the coordinate values measured in three times into an equation to obtain specific values of a, b and c; then, calculating an equation of change of the outer diameter size of the long sleeve according to the three coordinate points:
Y＝-0.005X2-0.005X+1
the ratio of the inner diameter to the outer diameter of the sleeve is 70%, then the inner side of the sleeve is provided with a lining, after the safety coefficient is calculated, the sleeve needs to be replaced when Y is 85%, and when Y is 85%, X is 6 calculated, namely the predicted long sleeve needs to be replaced when the furnace 6 is finished;
measuring for the third time to obtain coordinates (3, 0.94), verifying the equation, and establishing the equation without correction;
if the coordinate (3, 0.95) is obtained for the third time, and the equation is not satisfied after the equation is verified, the equation is solved again according to the mathematical method, Y is 0.85 and is substituted into the X value solved again by the equation, and when X has decimal, only integer bits are taken from the safety perspective.
In addition to the above embodiments, the present invention also includes other embodiments, and any technical solutions formed by equivalent transformation or equivalent replacement should fall within the scope of the claims of the present invention.
Claims (3)
1. A replacement prediction method for online measurement of the outer diameter of a continuous casting long sleeve is characterized by comprising the following steps: the method comprises the following steps:
step one, determining a rectangular coordinate system
Time is taken as the X axis and the unit is the furnace; the ratio of the measured outer diameter dimension to the original dimension is Y axis, and the unit is; the outer diameter of the sleeve before use is marked as (0, 1) on the coordinate axis;
step two, carrying out the first casing measurement
When the first furnace of continuous casting is finished, recording the first casting time as the coordinate value of an X axis, and measuring the ratio of the first outer diameter dimension to the original dimension as the coordinate value of a Y axis by using a measuring device to obtain a second coordinate point;
step three, carrying out second casing pipe measurement
When the second furnace pouring is finished, recording the second pouring time as the coordinate value of the X axis, and measuring the ratio of the second outer diameter dimension to the original dimension as the coordinate value of the Y axis by using a measuring device to obtain a third coordinate point;
step four, obtaining a change equation of the outer diameter size of the sleeve
And (3) calculating a change equation of the outer diameter size of the sleeve according to the three coordinate points:
Y＝aX2+bX+c
wherein: and a, b and c are constants obtained according to the three coordinate points, and an X value is obtained according to a Y value under a continuous casting safety condition, namely, the fact that the sleeve needs to be replaced when the furnace is finished is predicted.
2. The replacement prediction method for the on-line measurement of the outer diameter of the continuous casting long casing according to claim 1, characterized in that: and D, after the change equation of the outer diameter size of the sleeve is obtained in the fourth step, one measurement is added to verify the equation, if the equation is established, correction is not needed, if the equation is not established, the equation is solved again, and then the X value is obtained.
3. The replacement prediction method for the on-line measurement of the outer diameter of the continuous casting long casing according to claim 1, characterized in that: measuring device includes support frame 1, benchmark pole 2, carriage release lever 3 and scale 4, support frame (1) is from sleeve pipe safe distance parallel arrangement, benchmark pole (2) and support frame (1) vertical fixation, carriage release lever (3) are the L type, and one side is perpendicular with benchmark pole (2), and relative slidable arrangement, and the another side and benchmark pole (2) parallel arrangement, scale (4) are fixed to be set up between the two parallel sides of benchmark pole (2) and carriage release lever (3), and mutually perpendicular, form U type bayonet socket (5) of adjustable opening size, U type bayonet socket (5) are used for blocking the sleeve pipe and are measured the measuring position.
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| CN202010304950.9A CN111649649A (en) | 2020-04-17 | 2020-04-17 | Online measuring device and replacement prediction method for outer diameter of continuous casting long sleeve |
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| CN202010304950.9A CN111649649A (en) | 2020-04-17 | 2020-04-17 | Online measuring device and replacement prediction method for outer diameter of continuous casting long sleeve |
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2020
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| JPS61107110A (en) * | 1984-10-30 | 1986-05-26 | Mitsubishi Heavy Ind Ltd | Method for estimating adhesion amount on inner surface of pipe |
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| WO2016152816A1 (en) * | 2015-03-26 | 2016-09-29 | 東レバッテリーセパレータフィルム株式会社 | Film flatness inspection device and film flatness inspection method |
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| CN106323848A (en) * | 2016-08-03 | 2017-01-11 | 新兴铸管股份有限公司 | Method for predicting expected service life of metal pipe composite anti-corrosion coating |
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