CN114309519B - Method for determining spring elastic coefficient of load shedding spring of continuous casting stopper rod flow control mechanism - Google Patents
Method for determining spring elastic coefficient of load shedding spring of continuous casting stopper rod flow control mechanism Download PDFInfo
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- 230000007246 mechanism Effects 0.000 title claims abstract description 83
- 238000000034 method Methods 0.000 title claims abstract description 58
- 238000009749 continuous casting Methods 0.000 title claims abstract description 40
- 238000004519 manufacturing process Methods 0.000 claims abstract description 33
- 238000009826 distribution Methods 0.000 claims abstract description 14
- 238000005516 engineering process Methods 0.000 claims abstract description 13
- 229910000831 Steel Inorganic materials 0.000 claims description 66
- 239000010959 steel Substances 0.000 claims description 66
- 230000003628 erosive effect Effects 0.000 claims description 28
- 238000007667 floating Methods 0.000 claims description 22
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 15
- 230000005484 gravity Effects 0.000 claims description 13
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 8
- 229910052786 argon Inorganic materials 0.000 claims description 8
- 238000007664 blowing Methods 0.000 claims description 8
- 229910052791 calcium Inorganic materials 0.000 claims description 8
- 239000011575 calcium Substances 0.000 claims description 8
- 238000005259 measurement Methods 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 6
- 238000000691 measurement method Methods 0.000 claims description 5
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 claims description 2
- 230000007797 corrosion Effects 0.000 claims description 2
- 238000005260 corrosion Methods 0.000 claims description 2
- 230000002159 abnormal effect Effects 0.000 abstract description 5
- 238000005266 casting Methods 0.000 abstract description 5
- 230000001603 reducing effect Effects 0.000 abstract description 4
- 230000024121 nodulation Effects 0.000 description 25
- 239000007788 liquid Substances 0.000 description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 239000002436 steel type Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 229910000532 Deoxidized steel Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012821 model calculation Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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Abstract
The invention relates to a method for determining the spring elastic coefficient of a load shedding spring of a continuous casting stopper rod flow control mechanism, which comprises the following steps: step 1, determining the downstroke of a stopper rod; step 2, determining the load shedding spring coefficient of the executing mechanism: step 3: according to the technology, the effective distribution of the stopper stroke and the selection of the load-shedding spring coefficient are carried out, so that stable flow control of the stopper can be well realized, and the method can stabilize the flow control interval, thereby greatly reducing the abnormal hidden trouble of various unstable flow control and even failure flow control caused by overload of the flow control mechanism, and ensuring stable continuous casting production and stable casting blank quality.
Description
Technical Field
The invention relates to a method, in particular to a method for determining the spring elastic coefficient of a load shedding spring of a continuous casting stopper rod flow control mechanism, and belongs to the technical field of ferrous metallurgy continuous casting pouring.
Background
In the current continuous casting process in the steel industry, the control method for controlling pouring of the tundish molten steel into the crystallizer through the stopper rod (commonly called stopper rod flow control) is widely used in most of the continuous casting processes in steel factories at home and abroad due to flow control precision and commonly used stopper rod argon blowing technology. The stopper rod flow control mechanism uses an electric cylinder or a hydraulic cylinder and is matched with a liquid level detection system, so that the automatic liquid level control function of the continuous casting crystallizer can be well realized. The automatic control of the liquid level of the continuous casting crystallizer can stably improve the fluctuation level of the liquid level of the crystallizer, and plays a vital role in improving the surface quality of the whole continuous casting blank. However, the current automatic flow control of the stopper rod is easy to cause excessive downward stroke of the stopper rod due to unreasonable selection of key parameters of the load-reducing spring in the flow control mechanism, and the initial height of the mechanism is too high when the stopper rod is fully closed, so that the flow control failure is caused by too small load-reducing force of the spring; or because the upper stroke of the stopper rod mechanism is insufficient, the stopper rod nodulation stroke limits the steel passing amount when the water gap is blocked, so that stable flow control cannot be realized; or the load shedding spring of the stopper rod mechanism is not accurately selected according to the field process, so that the absolute value and fluctuation of the load of an electric cylinder or a hydraulic cylinder in actual production are large; the unstable working condition of the stopper rod flow control mechanism causes the decline of the liquid level control precision, and the hidden trouble of production accidents is large. For example, in a certain steel mill, overload jump rod caused by the loss and failure of a stopper rod control is performed for more than 15 times in one month, so that the normal continuous casting production is seriously influenced, and the defects of slag inclusion and inclusion on the surface of a slab are caused. Frequent unstable flow control also increases the labor intensity of continuous casting operators and prevents the improvement of the continuous casting labor efficiency of steel mills. Therefore, it is particularly important how to accurately determine the reasonable determination of the spring load shedding coefficient of the stopper rod mechanism, determine a reasonable stable flow control interval and realize stable flow control of the stopper rod.
Through the search of the inventors, the relevant literature and patents currently published for determination of the load shedding springs of continuous casting stopper mechanisms have focused on the mechanical design and maintenance aspects of stopper mechanisms. The invention discloses a stopper opening and closing mechanism for a tundish of a continuous casting machine, namely various structures and component arrangements of the stopper mechanism, and no consideration is given to how to set the stopper stroke, how to safely and effectively reduce the mechanism driving load and how to set the load-reducing spring elastic coefficient of a reasonable flow control interval. The patent technology of the stopper rod position adjusting device in the pouring process with the application number 201620027988.5 is that a transverse arm for fixing the stopper rod is tightly propped or loosened by rotating an adjusting nut so as to supplement the displacement of the stopper rod caused by the impact of molten steel, thereby solving the drift problem, and the problem of how to set the stroke of the stopper rod and how to safely and effectively reduce the load of a mechanism driving device are not involved at all.
In view of the current flow control device of the stopper rod mechanism commonly adopted by continuous casting, the invention provides a method for determining the up-down reasonable stroke of the stopper rod by theoretical process model calculation according to different steel continuous casting production working conditions, and determining the spring coefficient of the load shedding spring by a load balancing method after the stroke is determined. The method can stabilize the flow control interval, thereby greatly reducing various abnormal hidden dangers of unstable flow control and even failure flow control caused by overload of the flow control mechanism, and ensuring stable production of continuous casting and stable quality of casting blanks.
Disclosure of Invention
The invention provides a method for determining the spring coefficient of load shedding of a continuous casting stopper rod flow control mechanism, which aims at the problems existing in the prior art. The method can stabilize the flow control interval, thereby greatly reducing various abnormal hidden dangers of unstable flow control and even failure flow control caused by overload of the flow control mechanism, and ensuring stable production of continuous casting and stable quality of casting blanks.
In order to achieve the above object, the present invention is as follows: a method for determining the spring elastic coefficient of a load shedding spring of a continuous casting stopper rod flow control mechanism comprises the following steps:
Step 1, determining the downstroke of a stopper rod;
step 2, determining the load shedding spring coefficient of the executing mechanism:
Step 3: according to the technology, the stable flow control of the stopper rod can be well realized by effectively distributing the stopper rod stroke and selecting the load-shedding spring coefficient.
As an improvement of the invention, step 1. Stopper rod downstroke determination is carried out as follows:
1.1, steel classification, process path and production period continuous casting stopper erosion amount data measurement;
1.1.1 measuring steel grade determination;
According to the target calcium content of molten steel, steel grades are measured in a distinguishing mode; (calcium element in molten steel aggravates corrosion of refractory material, so the steel grade is measured by whether the calcium content exists or not
1.1.2 Determining the measured steel grade process path;
Because different process paths can cause different erosion amounts of the stopper heads, determining the measured steel grade process paths to be divided into an argon blowing straight-upward path (AR) and an LF or RH process path;
1.1.3 determining the production period of the measured steel grade;
The longer the production period is, the greatest the erosion amount generated by the stopper rod head, so that the stopper rod head erosion amount of the maximum production period of different steel grades is collected;
1.1.4 measurement method;
Measuring the outer diameter of the topmost end of the height of the stopper rod head (the position of the maximum outer diameter), the outer diameter of the position of 1/2 of the height and the outer diameter of the position of 1/3 of the height, and comparing the original outer diameters of the stopper rod head with the three outer diameters to obtain the reduced or increased outer diameter size, wherein the greatest reduction amount is adopted as the erosion amount H4 of the stopper rod head;
1.1.5 adopting the maximum value in all measured data as the maximum erosion amount of the club head;
1.2, the safety coefficient is set, the safety coefficient is multiplied by the maximum erosion amount of the rod head, then the lower stroke distribution amount H1 of the stopper rod can be determined, the previous common practice is to uniformly distribute the upper and lower strokes according to the proportion of half the stroke of the stopper rod, and the technology effectively reduces the lower stroke distribution amount on the basis of ensuring the maximum safety of the stopper rod by measuring the maximum erosion amount and ensures the use interval of the effective stroke of the stopper rod.
1.3, After the downward stroke H1 of the stopper rod is determined, comparing the distance H3 between a stopper rod mounting cross beam and a tundish cover, and enabling H3 to be more than H1, wherein the setting aims to ensure that the stopper rod mechanism cross beam and the tundish cover are not interfered under the condition that the stopper rod head is completely closed at the maximum erosion amount, and the stopper rod can be closed in a full-closed mode;
1.3, after the stopper lower stroke is determined, subtracting the stopper lower stroke from the mechanism full stroke to obtain the stopper upper stroke distance H2.
As an improvement of the present invention, the step 2. Determination of the load shedding spring coefficient of the actuator is specifically as follows: according to the set stopper rod stroke, setting a safe load proportion according to the load power of an executing mechanism, and theoretically calculating the load shedding spring coefficient of the executing mechanism.
2.1 Determination of the load shedding spring coefficient for achieving a stable flow control interval within an effective Stroke
2.1.1 Setting the spring force of the load-relieving spring at the position of the full closing+downstroke (H1) of the stopper mechanism to F 1
2.1.2 Fully open position of stopper mechanism relief spring force F 2
2.1.3 Setting a mandrel of a stopper rod mechanism and the gravity of a cross beam as G1;
2.1.4, setting the gravity of accessories such as a stopper rod, a screw rod and the like as G2;
2.1.5 setting the dead weight falling gravity of the stopper rod as G3;
2.1.6 setting the rated driving force of the actuator as F Cylinder with a cylinder body
2.1.7 Setting the working stroke of the stopper rod mechanism as H;
2.1.8 setting the load proportion of the actuating mechanism as A;
2.1.9 setting the elasticity coefficient of the load-shedding spring as K;
the theoretical calculation is as follows:
k＝(F1-F2)/H
＝(G1+G2-F Floating device 1-G3-G1-G2+F Floating device 2+F Cylinder with a cylinder body *A/H。
Compared with the prior art, the invention has the following positive effects: the Mei Gang continuous casting process of the steel mill adopts an electric cylinder executing mechanism to control flow by matching with a stopper rod. Before the technology is adopted, the stroke fluctuation of the stopper rod is larger (55-65), the installation height is higher, the load reducing effect of the mechanism spring can not be fully utilized, the load of the electric cylinder is large in the online use process, and the load fluctuation of the electric cylinders of different mechanisms is large. The electric cylinder is frequently out of control due to over-temperature and overload trip, and the single-month single-flow exceeds 15 times. After the technology is used again, the effective interval and the control precision of the control flow are ensured due to the effective and reasonable distribution of the stopper rod stroke and the accurate spring selection, so that the continuous casting control flow is ensured to be continuous and stable. The current of the electric cylinder is stable, the fluctuation amplitude is reduced by 28%, and no record of loss control failure occurs in 3 continuous months. After the technology is applied, the flow control stability brings stability of the liquid level of the crystallizer, the coincidence rate of the fluctuation of the liquid level of the crystallizer is improved by 18 percent, the quality defect of slag inclusion of a plate blank is reduced due to the stability of the liquid level, and the degradation rate of the slag inclusion is reduced by 28.9 percent in a comparable way.
Drawings
FIG. 1 is a schematic illustration of stopper rod stroke distribution;
FIG. 2 is a flow chart of a method for determining the spring rate of load shedding of a flow control mechanism in the state of a stopper rod erosion process;
FIG. 3 is a flow chart of a method for determining the spring rate of the flow control mechanism for the nodulation steel grade of the stopper rod.
The specific embodiment is as follows:
In order to enhance the understanding of the present invention, the present embodiment will be described in detail with reference to the accompanying drawings.
Example 1: a method for determining the spring elastic coefficient of a load shedding spring of a continuous casting stopper rod flow control mechanism comprises the following steps:
The stopper rod head nodulation steel type mainly needs to solve the problem that the stopper rod can realize complete and effective upward stroke under the condition of maximum nodulation amount, and solves the hidden trouble of insufficient steel flow in the fully opened state of the stopper rod. Within this safety value range, the stopper rod downstroke distribution is determined, and thus the reasonable flow control interval. And determining the elastic coefficient of the load-shedding spring in a reasonable flow control interval, so as to ensure the stable flow control of the stopper rod flow control mechanism.
Step 1, determining the upper stroke of a stopper rod;
1.1 steel grade separation, and measuring the fluctuation of continuous casting stopper rod nodulation in the process path and production period.
1.1.1 Measurement Steel grade determination
And the steel types are measured in a distinguishing manner according to the deoxidization mode of the molten steel.
1.1.2 Determination of measured Steel grade Process Path
Because different process paths can cause different stopper head nodulation amounts, the determined measured steel grade process paths are divided into an argon blowing straight-up path and an LF or RH process path. (theoretically, the longer the molten steel refining time is, the smaller the fluctuation of the stopper head nodulation is
1.1.3 Determination of the production cycle of the measured steel grade
The longer the production cycle, the greatest will be the amount of knots produced by the stopper head. It is necessary to measure the amount of stopper head nodulation for the maximum production cycle for different grades.
1.1.4 Measurement methods
And measuring a stopper rod within 10 minutes after casting, measuring a height value L of the stopper rod head in the height direction, comparing the measured value L with the original stopper rod height value, and determining the nodulation quantity of the stopper rod head.
1.1.5 Using the measured maximum as the stopper nodulation amount
And 1.2, determining the matched stroke of the stopper rod and the continuous casting tundish upper nozzle, setting a safety coefficient, multiplying the safety coefficient by the maximum nodulation amount of the head, and determining the distribution amount L2 of the stopper rod upper stroke by adding the matched stroke of the stopper rod and the continuous casting tundish upper nozzle. The prior common practice is to equally divide the upper and lower strokes according to the proportion of half the strokes of the stopper rod, and the technology ensures the upper stroke distribution amount under the condition of limiting opening of the stopper rod and ensures the use interval of the effective strokes of the stopper rod by measuring the maximum nodulation amount and adjusting the maximum nodulation amount by matching with a safety coefficient.
1.3 After the stopper upper stroke L2 is determined, the stopper lower stroke distance L1 is obtained by subtracting the stopper upper stroke from the mechanism full stroke. In order to avoid the situation that the downstroke cannot be completely closed under abnormal conditions, the upstroke is reduced by 10-20 mm according to the empirical value, and the value of the downstroke L1 is correspondingly increased by 10-20 mm.
1.4 Vs stopper mounting beam and tundish cover distance L3, let L3 > L1. The device aims to ensure that the cross beam of the stopper mechanism of the stopper head is not interfered with the tundish cover under the condition of complete closing, and the stopper can be closed in a full-closed mode.
Step 2, determining the load shedding spring coefficient of the executing mechanism: and setting a safe load proportion according to the set stopper rod travel and the load power of the actuating mechanism, and theoretically calculating the load shedding spring coefficient of the actuating mechanism. According to the method, the coefficient of the load-reducing spring is determined through theoretical calculation, and the aim of avoiding overload of an actuating mechanism in a flow control process is achieved in an effective stopper rod upper stroke, so that the load of an electric cylinder can be effectively reduced by the mechanism spring in a fully opened state, the effective execution of the actuating mechanism is ensured, and the hidden danger of loss and failure of control caused by overlarge load of the actuating mechanism is avoided.
2.1 Determination of the load shedding spring coefficient for achieving a stable flow control interval within an effective Stroke
2.1.1 Setting the spring force of the load-relieving spring at the position of the full closure and the downstroke (L1) of the stopper mechanism to be F 1
2.1.2 Fully open position of stopper mechanism relief spring force F 2
2.1.3 Setting the mandrel and the beam of the stopper mechanism to have the gravity G1
2.1.4 Setting the gravity of accessories such as a stopper rod, a screw rod and the like as G2
2.1.5 Setting the gravity of the dead weight falling back of the stopper rod as G3
2.1.6 Setting the rated driving force of the actuator as F Cylinder with a cylinder body
2.1.7 Setting the working stroke of the stopper rod mechanism to be H
2.1.8 The load ratio of the actuating mechanism is A
2.1.9 The spring coefficient of the load-shedding spring is K
The theoretical calculation is as follows:
k＝(F1-F2)/H
＝(G1+G2-F Floating device 1-G3-G1-G2+F Floating device 2+F Cylinder with a cylinder body *A/H
And step 3, effectively distributing the stroke of the stopper rod and selecting the load-shedding spring coefficient according to the technology, so that the stable flow control of the stopper rod can be well realized.
Application example 1:
For example, in a factory, the produced steel is deoxidized by aluminum, and also has calcium treatment steel, and in the continuous casting production process, two technological conditions of stopper erosion and stopper head nodulation exist, in the continuous casting process, a stopper is matched with an electric cylinder to control flow, the stroke of a stopper executing mechanism is 120mm, and according to the method, the spring load shedding coefficient of the electric cylinder of the following stopper controlling mechanism is determined:
1. The spring elastic coefficient of the relief spring of the flow control mechanism of the erosion process state of the stopper rod head is determined, see figure 2;
1. Stopper rod downstroke determination
1.1 Steel grade, process path and production period. (see Table 1)
1.1.1 Measurement Steel grade determination
And the steel grades are measured according to the target calcium content of the molten steel. In this example, the target calcium content of molten steel is 0.002%, and the target calcium content of 0.002% is used as the steel grade for distinguishing the corroded steel grade.
1.1.2 Determination of measured Steel grade Process Path
In order to ensure the numerical accuracy of the difference of the erosion amount of the stopper head caused by different process paths, the measured steel grade process paths are determined to be divided into an argon blowing straight upward path (AR) and an RH process path. Namely, the erosion state of the steel stopper rod of the two process paths of converter-argon blowing station-continuous casting and converter-RH vacuum station-continuous casting is measured. (see Table 1)
1.1.3 Determination of the production cycle of the measured steel grade
The longer the production period, the greatest the erosion amount generated by the stopper rod head, and the maximum production period of the steel grade in the example is 480min and the minimum production period is 120min. The amount of stopper erosion must be measured for different periods of 120min-480min production cycle. (see Table 1) 1.1.4 measurement method
The outer diameter of the topmost end of the height of the stopper rod head (the position of the maximum outer diameter), the outer diameter of the position of 1/2 of the height and the outer diameter of the position of 1/3 of the height are respectively measured, the original outer diameters of the stopper rod head are respectively compared by the three outer diameters, the reduced or increased outer diameter size is obtained, and the greatest reduction amount is adopted as the erosion amount H4 of the stopper rod head. (see Table 1)
TABLE 1 determination of the erosion amount of stopper rod head
1.1.5 The maximum erosion of the club head was 12.4mm using the maximum of all measurements.
1.2 Setting a safety factor of 2.0, and multiplying the safety factor of 2.0 by the maximum erosion amount of the club head by 12.4mm, then determining the downstroke distribution amount H1 of the club head to be 25mm.
1.3 After the stopper downstroke H1 is determined, comparing the stopper mounting cross beam and the tundish cover distance H3, and letting H3 > H1. I.e. H3 > 25mm.
1.3 After the stopper lower stroke is determined, subtracting the stopper lower stroke from the mechanism full stroke to obtain a stopper upper stroke distance H2 of 95mm.
2. And determining the load shedding spring coefficient of the actuating mechanism: and setting a safe load proportion according to the set stopper rod travel and the load power of the actuating mechanism, and theoretically calculating the load shedding spring coefficient of the actuating mechanism.
2.1 Off-load spring selection calculation
F1＝G1+G2-F Floating device 1-100*g
F2＝G1+G2-F Floating device 2-F Cylinder with a cylinder body *60％
k＝(F1-F2)/95
F 1 spring force of the relief spring at position +25mm of the total closure of the stopper mechanism
F 2 spring force of load-reducing spring at fully open position of stopper mechanism
G1- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
G1-Accessory gravity such as stopper rod, screw rod and the like
F Floating device 1/F Floating device 2 buoyancy of molten steel to which the stopper rod is subjected
The dead weight falling gravity A of the stopper rod is 100g
F Cylinder with a cylinder body rated driving force of electric cylinder 300g
The working stroke H of the stopper rod mechanism is 95mm
The load proportion A of the electric cylinder is 60%
K-spring rate of load-reducing spring
k＝(F1-F2)/85
＝(G1+G2-F Floating device 1-100*g-G1-G2+F Floating device 2+F Cylinder with a cylinder body *60％)/95
＝(F Floating device 2+F Cylinder with a cylinder body *60％-F Floating device 1)/95
＝(7.8*9.8*π*1.52*11+300*9.8*0.6-7.8*9.8*π*1.52*10.05)/95
＝23.97N/mm
The spring rate of the load shedding spring is calculated to be 24N/mm.
3. According to the technology, effective distribution of stopper rod travel is carried out, the stopper rod travel of the embodiment is 120mm, the upper travel is 95mm, the lower travel is 25mm, and the stable flow control of the stopper rod can be well realized by selecting the load-reducing spring coefficient of 23.97N/mm.
Application example 2: determination of spring elastic coefficient of load shedding of stopper rod head nodulation steel grade flow control mechanism
Referring to fig. 3, the stopper rod head nodulation steel grade mainly needs to solve the problem that the stopper rod upper stroke can be completely and effectively realized under the condition of maximum nodulation amount, and the hidden trouble of insufficient steel flow steel amount in the stopper rod full open state is solved. Within this safety value range, the stopper rod downstroke distribution is determined, and thus the reasonable flow control interval. And determining the elastic coefficient of the load-shedding spring in a reasonable flow control interval, so as to ensure the stable flow control of the stopper rod flow control mechanism. In this example, since a large amount of aluminum oxide is mixed in the aluminum deoxidized steel, the stopper head is likely to be nodulated, and therefore, the determination of the spring rate of the flow control mechanism is performed according to this case.
1. Stopper rod upstroke determination
1.1 Steel grade separation, and measuring the fluctuation of continuous casting stopper rod nodulation in the process path and production period.
1.1.1 Measurement Steel grade determination
And the steel types are measured in a distinguishing manner according to the deoxidization mode of the molten steel. In this example, aluminum was used for deoxidizing the molten steel. (see Table 2)
1.1.2 Determination of measured Steel grade Process Path
Because different process paths can cause different stopper head nodulation amounts, the determined measured steel grade process paths are divided into an argon blowing straight-up path and an LF or RH process path. In this example, the molten steel was measured by passing through an argon blowing station directly and after LF refining, and then was subjected to continuous casting, i.e., two process paths of converter-AR-CC and converter-AR-LF-CC were distinguished (see Table 2)
1.1.3 Determination of the production cycle of the measured steel grade
The longer the production cycle, the greatest will be the amount of knots produced by the stopper head. It is necessary to measure the amount of stopper head nodulation for the maximum production cycle for different grades. In this example, the maximum production period is 500min, and the minimum production period is 320min, i.e. the fluctuation of the nodulation of the stopper head at the end of the continuous casting process with the production period of 320min-500min is measured (see Table 2)
1.1.4 Measurement methods
And measuring a stopper rod within 10 minutes after casting, measuring a height value L of the stopper rod head in the height direction, comparing the measured value L with the original stopper rod height value, and determining the nodulation quantity of the stopper rod head. (measurement data see Table 2)
Table 2 stopper rod head nodulation rise value determination
1.1.5 Using the measured maximum value of 20mm as the stopper nodulation amount
1.2, Determining that the matching travel of the stopper rod and the water inlet of the continuous casting tundish is 80mm, setting the safety coefficient to be 2, multiplying the safety coefficient by the maximum nodulation amount of the club head to be 40mm, and determining that the distribution amount L2 of the stopper rod upper travel is 120mm when the matching travel of the stopper rod and the water inlet of the continuous casting tundish is 80 mm.
1.3 After the stopper upper stroke L2 is determined, the stopper upper stroke is subtracted from the mechanism full stroke to obtain a stopper lower stroke distance L1 of 0mm. To avoid the situation that the downstroke cannot be completely closed in an abnormal situation, the upstroke is reduced by 10mm-20mm according to the empirical value, in this case by 20mm, i.e. the upstroke L2 is determined as 100mm, and the value of the corresponding downstroke L1 is 20mm.
1.4 Vs stopper mounting beam and tundish cover distance L3, let L3 > L1. I.e. L3 > 20mm
2.1 Off-load spring selection calculation
F1＝G1+G2-F Floating device 1-100*g
F2＝G1+G2-F Floating device 2-F Cylinder with a cylinder body *60％
k＝(F1-F2)/100
F 1 spring force of the load-reducing spring at position +20mm of the total closure of the stopper mechanism
F 2 spring force of load-reducing spring at fully open position of stopper mechanism
G1- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
G1-Accessory gravity such as stopper rod, screw rod and the like
F Floating device 1/F Floating device 2 buoyancy of molten steel to which the stopper rod is subjected
The dead weight falling gravity A of the stopper rod is 100g
F Cylinder with a cylinder body rated driving force of electric cylinder 300g
The working stroke H of the stopper rod mechanism is 100mm
The load proportion A of the electric cylinder is 60%
K-spring rate of load-reducing spring
k＝(F1-F2)/100
＝(G1+G2-F Floating device 1-100*g-G1-G2+F Floating device 2+F Cylinder with a cylinder body *60％)/100
＝(F Floating device 2+F Cylinder with a cylinder body *60％-F Floating device 1)/100
＝(7.8*9.8*π*1.52*11+300*9.8*0.6-7.8*9.8*π*1.52*10.05)/100
＝22.77/mm
The spring rate of the off-load spring is calculated to be 22.77N/mm.
3. According to the technology, effective distribution of stopper rod travel is carried out, the stopper rod travel of the embodiment is 120mm, the upper travel is 100mm, the lower travel is 20mm, and the stable flow control of the stopper rod can be well realized by selecting the load-reducing spring coefficient of 22.77N/mm.
It should be noted that the above-mentioned embodiments are not intended to limit the scope of the present invention, and equivalent changes or substitutions made on the basis of the above-mentioned technical solutions fall within the scope of the present invention as defined in the claims.
Claims (1)
1. A method for determining the spring elastic coefficient of a load shedding spring of a continuous casting stopper rod flow control mechanism is characterized by comprising the following steps:
Step 1, determining the downstroke of a stopper rod;
step 2, determining the load shedding spring coefficient of the executing mechanism:
Step 3: according to the technology, the stable flow control of the stopper rod can be well realized by effectively distributing the stopper rod stroke and selecting the load-shedding spring coefficient;
step 1, determining the downstroke of a stopper rod, wherein the downstroke of the stopper rod is determined as follows:
1.1, steel classification, process path and production period continuous casting stopper erosion amount data measurement;
1.1.1 measuring steel grade determination;
According to the target calcium content of molten steel, steel grades are measured in a distinguishing mode; the calcium element in the molten steel can aggravate corrosion of the refractory, so that the steel grade is measured according to whether the calcium content exists,
1.1.2 Determining the measured steel grade process path;
Because different process paths can cause different erosion amounts of the stopper heads, determining the measured steel grade process paths to be divided into an argon blowing straight-upward path (AR) and an LF or RH process path;
1.1.3 determining the production period of the measured steel grade;
The longer the production period is, the greatest the erosion amount generated by the stopper rod head, so that the stopper rod head erosion amount of the maximum production period of different steel grades is collected;
1.1.4 measurement method;
measuring the outer diameter of the topmost end of the stopper rod head, namely the maximum outer diameter, the outer diameter of the 1/2 height and the outer diameter of the 1/3 height, respectively comparing the original outer diameters of the stopper rod head with the three outer diameters to obtain the reduced outer diameter size, and taking the maximum reduction amount as the erosion amount H4 of the stopper rod head;
1.1.5 adopting the maximum value in all measured data as the maximum erosion amount of the club head;
1.2, setting a safety coefficient of 2.0, and multiplying the safety coefficient by the maximum erosion amount of the club head to determine the downstroke distribution amount H1 of the club head;
1.3, after the downward stroke H1 of the stopper rod is determined, comparing the distance H3 between a stopper rod mounting cross beam and a tundish cover, and enabling H3 to be more than H1, wherein the setting aims to ensure that the stopper rod mechanism cross beam and the tundish cover are not interfered under the condition that the stopper rod head is completely closed at the maximum erosion amount, and the stopper rod can be closed in a full-closed mode;
after the stopper rod downstroke is determined, subtracting the stopper rod downstroke from the full stroke of the mechanism to obtain the stopper rod upstroke distance H2;
And 2. Determining the load shedding spring coefficient of the actuating mechanism, wherein the load shedding spring coefficient of the actuating mechanism is determined as follows:
2.1, determining a load shedding spring coefficient for realizing a stable flow control interval in an effective stroke;
2.1.1 setting the spring force of the load-relieving spring at the position of the full closing+downstroke (H1) of the stopper mechanism to F 1
2.1.2 Fully open position of stopper mechanism relief spring force F 2
2.1.3 Setting a mandrel of a stopper rod mechanism and the gravity of a cross beam as G1;
2.1.4, setting the gravity of the stopper rod and the screw rod accessory as G2;
2.1.5 setting the dead weight falling gravity of the stopper rod as G3;
2.1.6 setting the rated driving force of the actuator as F Cylinder with a cylinder body
2.1.7 Setting the upward stroke of the stopper rod mechanism as H;
2.1.8 setting the load proportion of the actuating mechanism as A;
2.1.9 setting the elasticity coefficient of the load-shedding spring as K;
the theoretical calculation is as follows:
k＝(F1-F2)/H
＝(G1+G2-F Floating device 1-G3-G1-G2+F Floating device 2+F Cylinder with a cylinder body *A)/H。
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