CN114309519A - Method for determining elasticity coefficient of load-reducing spring of continuous casting stopper rod flow control mechanism - Google Patents
Method for determining elasticity coefficient of load-reducing spring of continuous casting stopper rod flow control mechanism Download PDFInfo
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Abstract
The invention relates to a method for determining the 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 lower stroke of a stopper rod; step 2, determining the load-reducing spring coefficient of the actuating mechanism: and step 3: according to the method, the stopper rod stroke is effectively distributed, the load reduction spring coefficient is selected, stable flow control of the stopper rod can be well realized, and the method can stabilize the flow control interval, so that various abnormal hidden dangers of unstable flow control and even failure flow control caused by overload of a flow control mechanism are greatly reduced, and stable production of continuous casting and stable casting blank quality are guaranteed.
Description
Technical Field
The invention relates to a method, in particular to a method for determining the 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 the pouring of tundish molten steel into a crystallizer (commonly called stopper flow control) by using a stopper is widely used in most continuous casting processes in steel mills at home and abroad due to the flow control precision and the commonly used stopper 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 function of automatically controlling the liquid level of the continuous casting crystallizer can be well realized. The liquid level of the continuous casting crystallizer is automatically controlled, the fluctuation level of the liquid level of the crystallizer can be stably improved, and the method plays a vital role in improving the surface quality of the whole continuous casting blank. However, in the existing automatic flow control of the stopper rod, due to unreasonable selection of key parameters of a load reduction spring in a flow control mechanism, the downward process of the stopper rod is easy to be too large, the initial height of the mechanism is too high when the stopper rod is completely closed, and the flow control fails due to too small load reduction force of the spring; or the stopper rod nodulation stroke limits the steel passing amount when the water gap is blocked due to insufficient upper stroke of the stopper rod mechanism, 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 the electric cylinder or the hydraulic cylinder are large in actual production; the unstable working condition of the stopper rod flow control mechanism causes the reduction of the liquid level control precision and the occurrence of hidden danger of production accidents is large. For example, in a certain steel mill, the overload rod jump caused by the failure of the stopper rod flow control in a single flow in one month exceeds 15 times, the normal continuous casting production stability and smooth running are seriously influenced, and the defects of slag inclusion and inclusion on the surface of a plate blank are caused for many times. Frequent unstable flow control also increases the labor intensity of continuous casting operators, and hinders the improvement of the continuous casting labor efficiency of steel mills. Therefore, how to accurately determine the reasonable determination of the load shedding coefficient of the spring of the stopper rod mechanism, determine a reasonable stable flow control interval and realize the stable flow control of the stopper rod is particularly important.
Through the search of the inventor, the related documents and patents for determining the load relief spring of the continuous casting stopper mechanism disclosed at present concentrate on the mechanical design and maintenance aspects of the stopper mechanism. Like application number 201110100249.6's a conticaster tundish stopper rod closing mechanism, just announced various structures and the part of stopper rod mechanism and arranged, to how setting for the stopper rod stroke, how safe effectual reduction mechanism drive load, set up the regional relief spring elastic modulus of unloading of reasonable accuse and do not all relate to completely. The patent technology of the stopper rod position adjusting device in the pouring process with the application number of 201620027988.5 also comprises the step of tightly jacking or loosening a cross arm for fixing the stopper rod 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 problem of bias flow.
In view of the current flow control device of the stopper rod mechanism commonly adopted in continuous casting, the invention provides a method for determining the up-and-down reasonable stroke of the stopper rod action through theoretical process model calculation and determining the elasticity coefficient of the load-shedding spring through a load balancing method after the stroke is determined according to different steel continuous casting production working conditions. 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 casting blank quality.
Disclosure of Invention
The invention provides a method for determining the elastic coefficient of a load-shedding spring of a continuous casting stopper rod flow control mechanism aiming at the problems 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 casting blank quality.
In order to achieve the above object, the scheme of the invention is as follows: a method for determining the elastic coefficient of a load-reducing spring of a continuous casting stopper rod flow control mechanism comprises the following steps:
step 1, determining the lower stroke of a stopper rod;
step 2, determining the load-reducing spring coefficient of the actuating mechanism:
and step 3: according to the technology, the stopper rod stroke is effectively distributed, and the load-shedding spring coefficient is selected, so that stable flow control of the stopper rod can be well realized.
Step 1. determining the lower stroke of the stopper rod, which is an improvement of the invention, specifically as follows:
1.1 dividing the continuous casting stopper rod erosion amount data of steel types, process paths and production periods;
1.1.1, determining the measurement steel grade;
distinguishing and measuring steel types according to the target calcium content of the molten steel; (since calcium in molten steel aggravates corrosion of refractory, the steel type is measured by whether or not the calcium content is present)
1.1.2 determining the measured steel grade process path;
the erosion amount of the stopper rod head is different due to different process paths, and the process paths of the steel grade determined and measured are divided into an argon blowing straight upper path (AR) and an LF or RH process path;
1.1.3 determining the production period of the steel grade;
the longer the production cycle is, the largest erosion amount of the stopper rod head can be generated, so that the erosion amounts of the stopper rod heads in the maximum production cycles of different steel grades are collected;
1.1.4 measurement method;
respectively measuring the outer diameter (the maximum outer diameter position) of the topmost end of the stopper rod head height, the outer diameter at the position of the height 1/2 and the outer diameter at the position of the height 1/3, comparing the original outer diameters of the stopper rod head by using the three outer diameters respectively to obtain the reduced or increased outer diameter size, and taking the maximum reduction amount as the erosion amount H4 of the stopper rod head;
1.1.5, taking the maximum value in all the measured data as the maximum erosion amount of the club head;
1.2 setting a safety factor, multiplying the safety factor by the maximum erosion amount of the stopper rod head, determining the distribution amount H1 of the lower stroke of the stopper rod, wherein the upper stroke and the lower stroke are uniformly distributed according to the proportion of half of the stopper rod stroke in the conventional method, and the distribution amount of the lower stroke is effectively reduced by measuring the maximum erosion amount and adjusting the maximum erosion amount by matching with the safety factor in the technology on the basis of ensuring the maximum safety of the stopper rod, so that the use interval of the effective stroke of the stopper rod is ensured.
1.3 after the lower travel H1 of the stopper rod is determined, comparing the distance H3 between the mounting beam of the stopper rod and the tundish cover, and making H3 be greater than H1, wherein the setting aims to ensure that the beam of the stopper rod mechanism and the tundish cover are not interfered when the stopper rod head is in the maximum erosion amount and is completely closed, and the stopper rod can be closed in a totally-closed manner;
1.3 after the down stroke of the stopper rod is determined, the down stroke of the stopper rod is subtracted by the full stroke of the mechanism to obtain the up stroke distance H2 of the stopper rod.
Step 2, determining the unloading spring coefficient of the actuating mechanism, which is an improvement of the invention, specifically as follows: according to the set stopper rod stroke, the safe load proportion is set according to the load power of the actuating mechanism, and the load-shedding spring coefficient of the actuating mechanism is theoretically calculated.
2.1 determination of the coefficient of the relief spring for achieving a stable flow control interval within the effective stroke
2.1.1 setting the full-off + down stroke (H1) position of the stopper rod mechanism to reduce the spring force of the spring to F1
2.1.2 setting the full-open position relief spring force F of the stopper rod mechanism2
2.1.3 setting the core shaft of the stopper mechanism and the gravity of the beam as G1;
2.1.4 setting G2 gravity of accessories such as a stopper rod, a screw rod and the like;
2.1.5 setting the self-weight falling gravity of the stopper rod as G3;
2.1.6 setting the rated driving force of the actuating mechanism as FCylinder
2.1.7 setting the working stroke of the stopper mechanism as H;
2.1.8 setting the load ratio of the actuator to A;
2.1.9 setting the elastic coefficient of the load-reducing spring as K;
the theoretical calculation is as follows:
k＝(F1-F2)/H
＝(G1+G2-Ffloat 1-G3-G1-G2+FFloat 2+FCylinder*A/H。
Compared with the prior art, the invention has the following positive effects: the continuous casting process of the plum steel plant adopts an electric cylinder actuating mechanism matched with a stopper rod to control flow. Before the technology is adopted, the stopper rod has large stroke fluctuation (55-65), the installation height is higher, the load shedding effect of a mechanism spring cannot be fully utilized, the load of an electric cylinder is large in the online use process, and the load fluctuation of the electric cylinders of different mechanisms is large. The rod jumping of the electric cylinder is frequently out of control due to over-temperature and overload, and the single flow per month exceeds 15 times. After the technology is used again, because the travel of the stopper rod is effectively and reasonably distributed, the accurate spring model selection also ensures the effective interval and the control precision of flow control, thereby ensuring the continuous stability of the continuous casting flow control. The electric cylinder current is detailed and stable, the fluctuation amplitude is reduced by 28%, and a record that no flow control failure occurs in 3 consecutive months is created. After the technology is applied, the liquid level of the crystallizer is stable due to stable flow control, the coincidence rate of the fluctuation of the liquid level of the crystallizer less than +/-5 mm is improved by 18%, the quality defect of slag inclusion of a slab is reduced due to stable liquid level, and the slag inclusion degradation rate is reduced by 28.9% on a same scale.
Drawings
FIG. 1 is a schematic diagram of stopper rod stroke distribution;
FIG. 2 is a flow chart of a method for determining the elastic coefficient of a load-shedding spring of a flow control mechanism in a stopper rod head erosion process state;
FIG. 3 is a flow chart of a method for determining the elasticity coefficient of a load-shedding spring of a stopper rod head nodulation steel type flow control mechanism.
The specific implementation mode is as follows:
for the purpose of enhancing an understanding of the present invention, the present embodiment will be described in detail below with reference to the accompanying drawings.
Example 1: a method for determining the elastic coefficient of a load-reducing spring of a continuous casting stopper rod flow control mechanism comprises the following steps:
the stopper rod head nodulation steel grade mainly needs to solve the complete effectiveness that can realize stopper rod upstroke under the biggest nodulation volume condition, solves the production hidden danger that the steel circulation steel volume is not enough under the stopper rod full-open state. And determining the down stroke distribution of the stopper rod in the range of the safety value so as to determine a reasonable flow control interval. And determining the elastic coefficient of the load-reducing 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 upward stroke of a stopper rod;
1.1 dividing the steel grade, the process path and the production period, and measuring the data of the accretion amplitude of the continuous casting stopper rod.
1.1.1 measurement of Steel grade determination
And distinguishing and measuring steel types according to the molten steel deoxidation mode.
1.1.2 measured Steel grade Process Path determination
Because the amount of the nodules of the stopper rod head is different due to different process paths, the process paths for determining and measuring the steel grade are divided into an argon blowing straight upper path and an LF or RH process path. (theoretically, the longer the molten steel refining time and the soft blowing time, the smaller the expansion amount of the stopper rod head nodules)
1.1.3 measured Steel grade production cycle determination
The longer the production cycle, the greater the amount of nodules produced by the stopper rod head. Therefore, the amount of the stopper rod head nodules in the maximum production period of different steel grades needs to be measured and collected.
1.1.4 measurement method
And measuring the stopper rod within 10min after the pouring is finished, measuring the height value L of the stopper rod head in the height direction, comparing the height value L with the original stopper rod height value, and determining the amount of the tumor of the stopper rod head.
1.1.5 the maximum value measured is used as the stopper rod head tumor amount
1.2 confirm stopper stick and continuous casting tundish upper nozzle cooperation stroke, set for factor of safety, factor of safety multiplies the biggest knot volume of stick head, and the cooperation stroke of stopper stick and continuous casting tundish upper nozzle adds, then can confirm stopper stick upper stroke distribution L2. The upper and lower strokes are evenly distributed according to the proportion of half of the stopper rod stroke in the prior common method, and the technology is adjusted by measuring the maximum nodule quantity in cooperation with a safety factor, so that the upper stroke distribution quantity under the condition of the limit opening of the stopper rod is ensured, and the use interval of the effective stroke of the stopper rod is ensured.
1.3 when the stopper rod up stroke L2 is determined, the stopper rod up stroke is subtracted by the mechanism full stroke to obtain the stopper rod down stroke distance L1. In order to avoid the situation that the lower stroke can not be completely closed under the abnormal condition, the upper stroke is reduced by 10mm-20mm according to the empirical value, and the value of the lower stroke L1 is correspondingly increased by 10mm-20 mm.
1.4 comparison of stopper mounting beam and tundish cover distance L3, with L3 > L1. The stopper rod mechanism aims to ensure that the cross beam of the stopper rod mechanism and the tundish cover are not interfered under the condition that the stopper rod head is completely closed, and the stopper rod can be closed in a totally-closed manner.
Step 2, determining the load-reducing spring coefficient of the actuating mechanism: according to the set stopper rod stroke and the load power of the actuating mechanism, a safe load proportion is set, and the load-reducing spring coefficient of the actuating mechanism is theoretically calculated. The method defines the coefficient of the load-shedding spring through theoretical calculation, and aims to realize that an actuating mechanism is not overloaded in the flow control process in the effective stopper rod upper stroke, ensure that the mechanism spring can effectively reduce the load of an electric cylinder in the fully-open state, ensure the effective execution of the actuating mechanism and avoid the hidden danger of flow control failure caused by overlarge load of the actuating mechanism.
2.1 determination of the coefficient of the relief spring for achieving a stable flow control interval within the effective stroke
2.1.1 setting the full-off + down stroke (L1) position of the stopper rod mechanism to reduce the spring force of the spring to F1
2.1.2 setting the full-open position relief spring force F of the stopper rod mechanism2
2.1.3 setting the core shaft of the stopper mechanism and the gravity of the 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 gravity of the stopper rod as G3
2.1.6 setting the rated driving force of the actuating mechanism as FCylinder
2.1.7 setting the working stroke of the stopper rod mechanism as H
2.1.8 setting the actuator load ratio to A
2.1.9 setting the spring constant of the relief spring to K
The theoretical calculation is as follows:
k＝(F1-F2)/H
＝(G1+G2-Ffloat 1-G3-G1-G2+FFloat 2+FCylinder*A/H
And 3, effectively distributing the stopper rod stroke and selecting the load-shedding spring coefficient according to the technology, so that stable flow control of the stopper rod can be well realized.
Application example 1:
for example, in a certain factory, produced steel is subjected to aluminum deoxidation and calcium treatment, two process conditions of stopper erosion and stopper head nodulation exist in a continuous casting production process, a stopper is matched with an electric cylinder to control flow in the continuous casting process, the stroke of a stopper actuating mechanism is 120mm, and the electric cylinder spring load reduction coefficient of the following stopper control mechanism is determined according to the method disclosed by the invention:
firstly, determining the elastic coefficient of a load-reducing spring of a flow control mechanism in a stopper head erosion process state, and referring to fig. 2;
1. stopper rod down stroke determination
1.1 dividing steel grade, process path and production period. (see Table 1)
1.1.1 measurement of Steel grade determination
And (4) distinguishing and measuring steel grades 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 steel grades with the target calcium content of 0.002% are distinguished as steel grades for distinguishing erosion steel grades.
1.1.2 measured Steel grade Process Path determination
In order to ensure the numerical accuracy of different erosion quantities of the stopper rod head caused by different process paths, the process paths of the steel grade determined and measured are 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 process path and converter-RH vacuum station-continuous casting is measured and produced. (see Table 1)
1.1.3 measured Steel grade production cycle determination
The longer the production cycle, the largest erosion amount of the stopper rod head is, and the maximum production cycle of the steel grade in the embodiment is 480min and the shortest is 120 min. The amount of stopper erosion must be measured for different cycles of a production cycle of 120min to 480 min. (see Table 1)1.1.4 measurement method
And respectively measuring the outer diameter of the topmost height end (the maximum outer diameter position), the outer diameter at the position of the height 1/2 and the outer diameter at the position of the height 1/3 of the stopper rod head, comparing the three outer diameters with the original outer diameter of the stopper rod head respectively to obtain the reduced or increased outer diameter size, and adopting the maximum reduction amount as the erosion amount H4 of the stopper rod head. (see Table 1)
TABLE 1 stopper tip erosion determination
1.1.5 the maximum erosion using the maximum of all measurements as the club head was 12.4 mm.
1.2, setting a safety factor of 2.0, multiplying the safety factor of 2.0 by the maximum erosion amount of the rod head of 12.4mm, and determining that the distribution amount H1 of the lower stroke of the stopper rod is 25 mm.
1.3 stopper rod lower travel H1, comparing the stopper rod mounting beam and tundish cover distance H3, and making H3 > H1. I.e. H3 > 25 mm.
1.3 after the down stroke of the stopper rod is determined, the down stroke of the stopper rod is subtracted by the full stroke of the mechanism, and the distance H2 of the up stroke of the stopper rod is 95 mm.
2. Determining the load-reducing spring coefficient of the actuating mechanism: according to the set stopper rod stroke and the load power of the actuating mechanism, a safe load proportion is set, and the load-reducing spring coefficient of the actuating mechanism is theoretically calculated.
2.1 calculation of relief spring model selection
F1＝G1+G2-FFloat 1-100*g
F2＝G1+G2-FFloat 2-FCylinder*60％
k＝(F1-F2)/95
F1Load-reducing spring force at the position of +25mm of full closure of the stopper mechanism
F2At the full-open position of the stopper mechanism, the spring force of the relief spring is reduced
G1- -core shaft of stopper rod mechanism and gravity of beam
G1-accessory gravity of stopper rod, screw rod and the like
FFloat 1/FFloat 2The stopper rod is subjected to the buoyancy of the molten steel
The gravity A of the stopper rod falling by self weight is 100g
FCylinderRated driving force of electric cylinder is 300g
The working stroke H of the stopper mechanism is 95mm
The load proportion A of the electric cylinder is 60 percent
k-spring coefficient of load-reducing spring
k＝(F1-F2)/85
＝(G1+G2-FFloat 1-100*g-G1-G2+FFloat 2+FCylinder*60％)/95
＝(FFloat 2+FCylinder*60％-FFloat 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
Through calculation, the elasticity coefficient of the load-reducing spring is 24N/mm.
3. According to the technology, the stopper rod stroke is effectively distributed, the stopper rod stroke of the embodiment is 120mm, the upper stroke is 95mm, the lower stroke is 25mm, and the load-reducing spring coefficient is 23.97N/mm, so that stable flow control of the stopper rod can be well realized.
Application example 2: stopper rod head nodulation steel type flow control mechanism load reduction spring elastic coefficient determination
Referring to fig. 3, the stopper rod head nodulation steel grade mainly needs to solve the problem that the stopper rod can be completely effective in upward stroke under the condition of the maximum nodulation amount, and solves the production hidden trouble that the steel circulation steel amount is not enough under the full-open state of the stopper rod. And determining the down stroke distribution of the stopper rod in the range of the safety value so as to determine a reasonable flow control interval. And determining the elastic coefficient of the load-reducing 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, the aluminum deoxidized steel type has a large amount of aluminum oxide series inclusions, which easily cause the stopper head to form a tumor, so the elasticity coefficient of the load-reducing spring of the flow control mechanism is determined for the case.
1. Stopper rod upstroke determination
1.1 dividing the steel grade, the process path and the production period, and measuring the data of the accretion amplitude of the continuous casting stopper rod.
1.1.1 measurement of Steel grade determination
And distinguishing and measuring steel types according to the molten steel deoxidation mode. In this case, the molten steel is deoxidized by aluminum. (see Table 2)
1.1.2 measured Steel grade Process Path determination
Because the amount of the nodules of the stopper rod head is different due to different process paths, the process paths for determining and measuring the steel grade are divided into an argon blowing straight upper path and an LF or RH process path. In this example, the measured molten steel was passed through an argon blowing station and refined in LF and then passed through a continuous casting process, i.e., two process routes of converter-AR-CC and converter-AR-LF-CC were distinguished (see Table 2)
1.1.3 measured Steel grade production cycle determination
The longer the production cycle, the greater the amount of nodules produced by the stopper rod head. Therefore, the amount of the stopper rod head nodules in the maximum production period of different steel grades needs to be measured and collected. In this example, the maximum production cycle is 500min, the minimum production cycle is 320min, i.e., the amount of the stopper rod end nodule expansion at the end of the continuous casting process with the production cycle of 320min-500min is measured (see Table 2)
1.1.4 measurement method
And measuring the stopper rod within 10min after the pouring is finished, measuring the height value L of the stopper rod head in the height direction, comparing the height value L with the original stopper rod height value, and determining the amount of the tumor of the stopper rod head. (the measured data are shown in Table 2)
TABLE 2 stopper head nodule amplitude determination
1.1.5 the maximum value of 20mm measured is used as the stopper rod head tumor formation amount
1.2 confirm stopper stick and continuous casting pouring basket upper nozzle cooperation stroke is 80mm, set for factor of safety 2, factor of safety is multiplied the maximum knot volume of stick head and is 40mm, add stopper stick and continuous casting pouring basket upper nozzle cooperation stroke 80mm, then can confirm that stopper stick upper stroke distribution L2 is 120 mm.
1.3 after the stopper rod up-stroke L2 is determined, the stopper rod up-stroke is subtracted by the mechanism full stroke to obtain the stopper rod down-stroke distance L1 of 0 mm. In order to avoid the situation that the lower stroke can not be completely closed under the abnormal condition, the upper stroke is reduced by 10mm-20mm according to the empirical value, in the case of the invention, the upper stroke is reduced by 20mm, namely the upper stroke L2 is determined to be 100mm, and the corresponding value of the lower stroke L1 is 20 mm.
1.4 comparison of stopper mounting beam and tundish cover distance L3, with L3 > L1. Namely, L3 > 20mm
2.1 calculation of relief spring model selection
F1＝G1+G2-FFloat 1-100*g
F2＝G1+G2-FFloat 2-FCylinder*60％
k＝(F1-F2)/100
F1Load-reducing spring force at the position of full close +20mm of the stopper mechanism
F2At the full-open position of the stopper mechanism, the spring force of the relief spring is reduced
G1- -core shaft of stopper rod mechanism and gravity of beam
G1-accessory gravity of stopper rod, screw rod and the like
FFloat 1/FFloat 2The stopper rod is subjected to the buoyancy of the molten steel
The gravity A of the stopper rod falling by self weight is 100g
FCylinderRated driving force of electric cylinder is 300g
The working stroke H of the stopper mechanism is 100mm
The load proportion A of the electric cylinder is 60 percent
k-spring coefficient of load-reducing spring
k＝(F1-F2)/100
＝(G1+G2-FFloat 1-100*g-G1-G2+FFloat 2+FCylinder*60％)/100
＝(FFloat 2+FCylinder*60％-FFloat 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 elasticity coefficient of the relief spring is calculated to be 22.77N/mm.
3. The stopper rod stroke is effectively distributed according to the technology, the stopper rod stroke of the embodiment is 120mm, the upper stroke is 100mm, the lower stroke is 20mm, and the load-reducing spring coefficient is 22.77N/mm, so that the stable flow control of the stopper rod can be well realized.
It should be noted that the above-mentioned embodiments are not intended to limit the scope of the present invention, and all equivalent modifications and substitutions based on the above-mentioned technical solutions are within the scope of the present invention as defined in the claims.
Claims (3)
1. A method for determining the elastic coefficient of a load-reducing spring of a continuous casting stopper rod flow control mechanism is characterized by comprising the following steps:
step 1, determining the lower stroke of a stopper rod;
step 2, determining the load-reducing spring coefficient of the actuating mechanism:
and step 3: according to the technology, the stopper rod stroke is effectively distributed, and the load-shedding spring coefficient is selected, so that stable flow control of the stopper rod can be well realized.
2. The method for determining the elastic coefficient of the load-reducing spring of the continuous casting stopper rod flow control mechanism according to claim 1, wherein the stopper rod downward stroke is determined in step 1, and specifically, the method comprises the following steps:
1.1 dividing the continuous casting stopper rod erosion amount data of steel types, process paths and production periods;
1.1.1, determining the measurement steel grade;
distinguishing and measuring steel types according to the target calcium content of the molten steel; (since calcium in molten steel aggravates corrosion of refractory, the steel type is measured by whether or not the calcium content is present)
1.1.2 determining the measured steel grade process path;
the erosion amount of the stopper rod head is different due to different process paths, and the process paths of the steel grade determined and measured are divided into an argon blowing straight upper path (AR) and an LF or RH process path;
1.1.3 determining the production period of the steel grade;
the longer the production cycle is, the largest erosion amount of the stopper rod head can be generated, so that the erosion amounts of the stopper rod heads in the maximum production cycles of different steel grades are collected;
1.1.4 measurement method;
respectively measuring the outer diameter (the maximum outer diameter position) of the topmost end of the stopper rod head height, the outer diameter at the position of the height 1/2 and the outer diameter at the position of the height 1/3, comparing the original outer diameters of the stopper rod head by using the three outer diameters respectively to obtain the reduced or increased outer diameter size, and taking the maximum reduction amount as the erosion amount H4 of the stopper rod head;
1.1.5, taking the maximum value in all the measured data as the maximum erosion amount of the club head;
1.2, setting a safety coefficient, multiplying the safety coefficient by the maximum erosion amount of the rod head, determining the distribution amount H1 of the lower stroke of the stopper rod,
1.3 after the lower travel H1 of the stopper rod is determined, comparing the distance H3 between the mounting beam of the stopper rod and the tundish cover, and making H3 be greater than H1, wherein the setting aims to ensure that the beam of the stopper rod mechanism and the tundish cover are not interfered when the stopper rod head is in the maximum erosion amount and is completely closed, and the stopper rod can be closed in a totally-closed manner;
after the down stroke of the stopper rod is determined, the down stroke of the stopper rod is subtracted by the full stroke of the mechanism to obtain the up stroke distance H2 of the stopper rod.
3. The method for manufacturing the pickled plate for low carbon steel deep drawing with earing rate as set forth in claim 1, wherein in the step 2, the load-reducing spring constant of the actuator is determined as follows:
2.1, determining the coefficient of a load shedding spring in a stable flow control interval in an effective stroke;
2.1.1 setting the full-off + down stroke (H1) position of the stopper rod mechanism to reduce the spring force of the spring to F1
2.1.2 setting the full-open position relief spring force F of the stopper rod mechanism2
2.1.3 setting the core shaft of the stopper mechanism and the gravity of the beam as G1;
2.1.4 setting G2 gravity of accessories such as a stopper rod, a screw rod and the like;
2.1.5 setting the self-weight falling gravity of the stopper rod as G3;
2.1.6 setting the rated driving force of the actuating mechanism as FCylinder
2.1.7 setting the working stroke of the stopper mechanism as H;
2.1.8 setting the load ratio of the actuator to A;
2.1.9 setting the elastic coefficient of the load-reducing spring as K;
the theoretical calculation is as follows:
k＝(F1-F2)/H
＝(G1+G2-Ffloat 1-G3-G1-G2+FFloat 2+FCylinder*A/H。
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