CN115480597B - Method for controlling viscous state of roller system in zinc pot in hot galvanizing process - Google Patents
Method for controlling viscous state of roller system in zinc pot in hot galvanizing process Download PDFInfo
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- CN115480597B CN115480597B CN202210987690.9A CN202210987690A CN115480597B CN 115480597 B CN115480597 B CN 115480597B CN 202210987690 A CN202210987690 A CN 202210987690A CN 115480597 B CN115480597 B CN 115480597B
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Abstract
The invention provides a method for controlling the viscous state of a roller system in a zinc pot in a hot galvanizing process, which comprises the following steps: dividing calculation sections for the zinc liquid around the sink roll, the stabilizing roll, the correcting roll and the strip steel; calculating viscous resistance of each roller and zinc liquid around the strip steel contacted with each roller in sequence in the galvanization process flow according to each roller in the roller system, and simultaneously adjusting the other two rollers to be small in insertion amount so as to prevent rotation and enable the other two rollers to be in a sliding friction state just contacted with the strip steel; calculating total viscous resistance of the strip steel along the process of hot galvanizing based on the viscous resistance of the zinc liquid around each roller and the strip steel contacted with the roller; and controlling the viscous state of a roller system in the zinc pot in the hot galvanizing process by using the calculated total viscous resistance of the strip steel in the hot galvanizing process. According to the invention, the roller system is calculated to be subjected to high Wen Xinye viscous resistance under various working conditions in real time, and data support is provided for the realization of the optimization of the process parameters of the roller system in the subsequent zinc pot, so that the accurate dynamic regulation and control of the working state of the roller system in zinc liquid is finally realized.
Description
Technical Field
The invention relates to the technical field of hot galvanizing, in particular to a method for controlling the viscous state of a roller system in a zinc pot in the hot galvanizing process.
Background
Hot galvanizing is the last procedure of the finished product of the ultrathin intelligent household appliance plate strip, and the surface quality of the plate strip, such as the uniformity of the galvanized thickness and the deviation of the thickness of the upper surface coating and the lower surface coating, is a main measurement index of the surface quality of the hot-dip plated plate strip. When the plate strip enters a hot galvanizing unit to develop a plate strip hot galvanizing process, the plate strip is subjected to a continuous annealing process and then subjected to a galvanization process. In the galvanizing process, firstly, the zinc enters a roller system in a zinc pot, then, the zinc enters an air knife from the zinc pot, the superfluous zinc layer on the surface of the plate belt is scraped off, and finally, the zinc is cooled and formed, as shown in figure 1. The roller system in the zinc pot mainly comprises a sink roller, a stabilizing roller and a correcting roller, because the zinc pot contains a lot of zinc slag, such as scum and sediment, and the viscous resistance of each roller of the roller system is complex under the actions of a plurality of physical fields such as high temperature, zinc liquid field and the like, the viscosity of the zinc liquid which is a main medium in the zinc pot is greatly influenced by temperature, zinc slag content and the like. In order to research and realize that the sink roll system is in the optimal working state and viscous state in the zinc pot, the magnitude of the viscous resistance of the zinc liquid needs to be obtained in real time, and the viscous resistance is the direct expression of the viscous state of the roll system in the zinc pot, so that the sink roll system is accurately controlled, and technical support is provided for producing high-grade and high-precision plate strips.
At present, the calculation of the viscous resistance of the zinc liquid at each position along the strip steel direction in a zinc pot is difficult to realize, and only the stable region of the zinc liquid boundary layer around the strip steel can be calculated, for example, the strip steel is in a translational state, at the moment, the surrounding zinc liquid boundary layer is a translational boundary layer, especially, the viscous resistance calculation can be carried out in the region where the strip steel is not contacted with the roller, but the viscous resistance calculation can not be carried out in the region where the strip steel is directly contacted with the roller and rotates together, and the boundary layers at the screwing-in end, the screwing-out end and the contact position of the roller are all rotating boundary layers, as shown in fig. 2 (a), 2 (b) and 2 (c), because the zinc liquid boundary layer at the position is unstable under the condition that the roller and the strip steel rotate, the influence of surrounding rotation is larger, and the zinc liquid boundary layer breaks away from the surface of the roller and the strip steel, the viscous resistance of the roller system and the strip steel cannot be calculated, and the total viscous resistance of the corresponding strip steel in the zinc pot cannot be obtained, and the accurate control of the viscous state of the roller system in the zinc liquid cannot be realized.
Disclosure of Invention
In order to ensure normal development of a hot galvanizing process and normal production of a unit, improve the galvanization quality of strip steel products and reduce the influence of viscous characteristics of zinc liquid on the running posture of a roller system in the running process, the invention provides a control method of the viscous state of the roller system in a zinc pot in the hot galvanizing process.
For this purpose, the invention adopts the following technical scheme:
the invention provides a method for controlling the viscous state of a roller system in a zinc pot in a hot galvanizing process, which comprises the following computer-implemented steps:
dividing calculation sections for the zinc liquid around the sink roll, the stabilizing roll, the correcting roll and the strip steel;
calculating viscous resistance of each roller and zinc liquid around the strip steel contacted with each roller in sequence in the galvanization process flow according to each roller in the roller system, and simultaneously adjusting the other two rollers to be small in insertion amount so as to prevent rotation and enable the other two rollers to be in a sliding friction state just contacted with the strip steel;
calculating total viscous resistance of the strip steel along the process of hot galvanizing based on the viscous resistance of the zinc liquid around each roller and the strip steel contacted with the roller;
controlling the temperature of zinc liquid in the zinc pot based on the total viscous resistance of the strip steel along the process of hot galvanizing, thereby realizing the control of the viscous state of a roller system in the zinc pot in the hot galvanizing process;
wherein, calculate each roller and with this roller contact belted steel surrounding zinc liquid viscous resistance, include:
setting the insertion amount of the correction roller and the stabilizing roller;
calculating the wrap angles of the strip steel sink roll, the stabilizing roll and the correcting roll according to the insertion amounts of the correcting roll and the stabilizing roll;
calculating viscous resistance of each section of the strip steel without the roller in translation;
Measuring the tension of the strip steel at the inlet and the outlet of the hot galvanizing unit;
and reversely solving the viscous resistance of the strip steel and the roller in the rotation process based on the strip steel tension at the inlet and outlet of the unit and the viscous resistance of the strip steel in the translational state along the path.
Further, according to the sequence of each roller in the roller system in the galvanization process flow, calculating the viscous resistance of each roller and the zinc liquid around the strip steel contacted with the roller in sequence, comprising the following steps:
calculating the viscous resistance of the sinking roller and the zinc liquid around the strip steel contacted with the sinking roller;
under the condition of keeping the tension and the belt speed of the strip steel at the inlet of the hot galvanizing unit unchanged, calculating the correction roller and the viscous resistance of the zinc liquid around the strip steel contacted with the correction roller;
and under the condition of keeping the tension and the belt speed of the strip steel at the inlet of the hot galvanizing unit unchanged, calculating the viscous resistance of the stabilizing roller and the zinc liquid around the strip steel contacted with the stabilizing roller.
Further, calculating viscous drag of each section of the strip without the roller during translation comprises:
s1, inputting parameters of equipment of a roller and a zinc pot and technological parameters of strip steel, wherein the parameters comprise the radius R of a sink roller, a stabilizing roller and a correcting roller c 、R w 、R q The unit is m, and the wrap angle theta of the rotation end of the sink roll cin In units of °x, the amount of roller insertion is corrected q In mm, the amount of inserted stabilizing roller x w The unit is mm, and the distance S between the rolls is equal to that of zinc liquid 0 The unit is m, and the vertical distance S between the sinking roller and the correcting roller 1 The unit is m, and the vertical distance S between the correcting roller and the stabilizing roller 2 The unit is m, and the vertical distance S between the stabilizing roller and the molten zinc 3 The unit is m, the strip steel speed V, the unit is m/min, the zinc liquid viscosity eta, and the zinc liquid density rho in a zinc pot at high temperature Zn The width B of the strip steel is in mm; critical viscous resistance of zinc liquid of zinc pot to strip steel [ F ]]The unit is N, and the lowest temperature { T ] of zinc liquid in a zinc pot under normal working state zn } min Maximum temperature { T } zn } max The unit is the temperature output value T of the zinc pot under the optimal condition of the viscous state of the sinking roller system * The units are in degrees celsius;
s2, calculating effective overcurrent length delta of each section of the strip steel without the roller i Units are m, i=1, 2,3,4:
s3, sequentially measuring the flow velocity v of the zinc liquid around each section of the strip steel without the roller i The unit is m/min, i=1, 2,3,4, and the relative speed difference Deltav of the strip steel and the surrounding zinc liquid is calculated i ＝V-v i The units are m/min, i=1, 2,3,4;
s4, setting the initial value i=1 of the serial numbers of each section of the strip steel without the roller;
s5, calculating Reynolds number Re i ：
S6, judging the boundary layer fluid type of the strip steel section: judging Re i ≤5×10 5 Whether or not to establish; if Re is i ≤5×10 5 Established, boundary layer thickness calculation mode 1 is used: l (L) i ＝4.64δ i (Re i ) -1/2 Calculating, wherein the unit is m; if Re is i ≤5×10 5 If not, using boundary layer thickness calculation mode 2:
calculating, wherein the unit is m;
s7, calculating viscous resistance F of each section of strip steel without roller in translation i ：
The unit is N; wherein k is a working condition coefficient of the galvanization process;
s8, judging whether i is less than or equal to 4 or not; if i.ltoreq.4 is true, let i=i+1 and go to S5; if i is less than or equal to 4, outputting viscous resistance F of each section of strip steel without roller in translation i The unit is N, i=1, 2,3,4.
Further, based on the tensile force of the strip steel at the inlet and the outlet of the hot galvanizing unit and the viscous resistance of the strip steel in the along-path translation state, the method for reversely solving the viscous resistance of the strip steel and the roll in the rotation process comprises the following steps:
calculating sliding friction force between the strip steel and other rollers according to Newton's second law of motion along the radial direction of the roller surface;
the tension of the screwing-in end and the tension of the unscrewing end of the roller are reversely calculated based on the tension of the strip steel at the inlet and the outlet of the hot galvanizing unit, viscous resistance of the strip steel in the state of translational motion along the path and sliding friction force between the strip steel and other rollers;
the viscous drag of the roll and the strip in contact with the roll is calculated based on the roll's in-end tension, out-end tension, the roll's surface friction coefficient, and wrap angle according to the euler theorem.
Further, based on the tension of the inlet strip steel, the tension of the outlet strip steel, the viscous resistance of the strip steel in the state of the strip steel along the path translation and the sliding friction force between the strip steel and other rollers of the hot galvanizing unit, the method for reversely solving the tension of the screwing-in end and the tension of the unscrewing-out end of the rollers comprises the following steps:
Screw-in end tension T of sink roll c And the unscrewing end tension T' c The method comprises the following steps:
screw-in end tension T of correction roller q And the unscrewing end tension T' q The method comprises the following steps:
screw-in end tension T of stabilizing roller w And the unscrewing end tension T' w The method comprises the following steps:
wherein T is in The unit of the tension of the strip steel at the inlet of the hot galvanizing unit is N and T outc The unit of the tension of strip steel at the outlet of the hot galvanizing unit is N under the condition that the sinking roller rotates and the other two rollers do not rotate; t (T) outq The strip steel tension at the outlet of the hot galvanizing unit is the same as that of the dip roll and the correction roll which rotate under the condition that the stabilizing roll does not rotate; t (T) outw The unit is N, which is the tension of strip steel at the outlet of a hot galvanizing unit under the condition that three rollers rotate; f (f) q 、f w 、F i The viscous drag of each section of the strip steel without the roller is N, i=1, 2,3 and 4 when sliding friction force between the strip steel and the correcting roller and sliding friction force between the stabilizing roller are calculated when the sinking roller and the viscous drag of the zinc liquid around the strip steel contacted with the sinking roller are respectively calculated; the unit is N.
Further, calculating the viscous drag of the roll and the strip steel in contact therewith based on the roll in-end tension, the roll out-end tension, the roll surface friction coefficient and the wrap angle according to the euler theorem, comprising:
calculating viscous resistance F of sinking roller and strip steel contacted with sinking roller c ：
Calculating the viscous resistance F of the correction roller and the strip steel contacted with the correction roller q ：
Calculating viscous resistance F of stabilizing roller and strip steel contacted with stabilizing roller w ：
Wherein, the liquid crystal display device comprises a liquid crystal display device,
respectively representing the strip steel tension of the unscrewing ends of the sink roll, the correcting roll and the stabilizing roll under the condition of not considering viscous resistance, wherein the unit is N; θ c 、θ w 、θ q The wrap angles of the strip steel sink roll, the stabilizing roll and the correcting roll are respectively shown in the unit of an angle degree; mu (mu) c 、μ q 、μ w The friction coefficients of the surfaces of the strip steel, the sinking roller, the correcting roller and the stabilizing roller are respectively.
Further, calculating the wrap angle theta of the strip steel sink roll, the stabilizing roll and the leveling roll according to the insertion amount of the leveling roll and the stabilizing roll c 、θ w 、θ q Comprising:
wherein θ c0 The initial wrap angle of the strip steel and the sinking roller is formed; r is R c 、R w 、R q Respectively isSink roll, stabilizing roll, correct the roller radius, the unit is m; x is x q 、x w The leveling roller insertion amount and the stabilizing roller insertion amount are respectively in mm.
Further, calculating total viscous drag of the strip steel along the process of hot galvanizing based on the viscous drag of each roller and the zinc liquid around the strip steel contacted with the roller, comprising:
F s ＝F i +F c +F q +F w ；
wherein F is s For the total viscous resistance of the strip steel along the process of hot galvanizing, F c Is the viscous resistance of the sinking roller and the zinc liquid around the contact strip steel, F q To correct the viscous resistance of the roller and the zinc liquid around the contact strip steel, F w To stabilize the viscous resistance of the roll and the zinc liquid around the strip steel contacted with the roll, F i The viscous resistance of each section of the strip without the roller in translation is expressed in units of N, i=1, 2,3,4.
Further, the total viscous resistance of the strip steel along the process controls the temperature of zinc liquid in the zinc pot based on the hot galvanizing process, thereby realizing the control of the viscous state of a roller system in the zinc pot in the hot galvanizing process, and the method comprises the following steps:
measuring the temperature T of zinc liquid in a zinc pot zn And setting initial values j=1 of temperature control variable and variable temperature delta T, and calculating a temperature control step m:
the viscous state control of the roller system in the zinc pot comprises the following steps:
judgment F s ≤[F]Whether or not to establish; if F s ≤[F]If true T * ＝T zn The method comprises the steps of carrying out a first treatment on the surface of the If F s ≤[F]Not true, T * ＝T zn +j.DELTA.T, and judging whether j is less than or equal to m; if j is less than or equal to m, j=j+1 is made and the roll system viscous resistance calculation process is carried out; if j is not less than or equal to m, output T * ；F s The total viscous resistance of the strip steel along the process of hot galvanizing is obtained.
The invention has the advantages and positive effects that: the method can fully combine the equipment characteristics of a hot galvanizing unit according to the field production condition of galvanized strip steel, collect relevant parameters of a set sink roll, a stabilizing roll, a correcting roll and a zinc pot, perform partition calculation on the strip steel and each roll partition section, directly calculate the translational viscous resistance of the strip steel without the roll section according to the speed difference between the strip steel and zinc liquid and Newton hydrodynamics, reversely calculate the viscous resistance of the sink roll, the stabilizing roll and the correcting roll on the basis of the strip steel tension measurement at the inlet and outlet of the unit and the translational viscous resistance of the strip steel under the condition of changing the rotation condition of the correcting roll and the stabilizing roll, finally calculate the total viscous resistance of the strip steel and the zinc pot roll system, effectively master the viscous characteristic of the zinc liquid to the roll system, and further perform the viscous state control of the roll system in the zinc pot according to the viscous characteristic of the zinc liquid to the roll system, thereby providing possibility for producing high-grade and high-precision strip steel in the hot galvanizing process.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to the drawings without inventive effort to a person skilled in the art.
FIG. 1 is a schematic diagram of the galvanization process composition and the section of strip steel in the embodiment of the invention;
FIG. 2 (a) is a schematic diagram of the boundary layer around the submerged roller and the strip according to the embodiment of the present invention;
FIG. 2 (b) is a schematic diagram of the boundary layer around the corrective roll and the strip in an embodiment of the invention;
FIG. 2 (c) is a schematic diagram of the boundary layer around the stabilizer roll and the strip according to an embodiment of the present invention;
FIG. 3 is a flow chart of a method for controlling the viscous state of a roller system in a zinc pot during hot galvanizing in an embodiment of the invention;
FIG. 4 is a flow chart showing calculation of viscous resistance of molten zinc around a sink roll and a strip steel contacted with the sink roll in an embodiment of the invention;
FIG. 5 is a flow chart showing the calculation of the viscous resistance of the corrective roll and the molten zinc around the contact strip according to the embodiment of the invention;
FIG. 6 is a flow chart showing calculation of viscous resistance of the stabilizing roll and the molten zinc around the strip steel contacted with the stabilizing roll in the embodiment of the invention;
FIG. 7 is a flow chart of viscous drag calculation for a belt without roller segment translation in an embodiment of the invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention provides a control method for the viscous state of a roller system in a zinc pot in a hot galvanizing process, which combines the equipment characteristics of a hot galvanizing unit and fully considers the structural characteristics and the working environment characteristics of a sink roller system. Calculating viscous resistance of a zinc liquid boundary layer in a translational state in the strip steel along the path, and reversely solving viscous resistance of the strip steel and the sink roll in the rotation process based on the strip steel tension at the inlet and the outlet of the unit and the viscous resistance of the strip steel in the translational state of the strip steel along the path by measuring the strip steel tension at the inlet and the outlet of the unit; under the condition of keeping the tension and the belt speed of the strip steel at the inlet of the unit unchanged, setting the small insertion amount of the stabilizing roller by the method to reversely calculate the viscous resistance of the correcting roller and the strip steel; and under the condition of keeping the tension and the belt speed of the strip steel at the inlet of the unit unchanged, reversely solving the viscous resistance of the stabilizing roller and the strip steel by the method. The method comprises the steps of establishing a viscous resistance calculation model in the working process of a roller system in a zinc pot in the hot galvanizing process, calculating the high Wen Xinye viscous resistance of the roller system under various working conditions in real time, providing key information for the influence of zinc liquid on the roller system, and providing data support for the realization of the optimization of the process parameters of the roller system in the subsequent zinc pot, so that the accurate dynamic regulation and control of the working state of the roller system in the zinc liquid is finally realized.
Taking as an example each roller of a zinc pot roller system of a certain zinc plating unit as shown in fig. 1, the roller system comprises: sink roll, stabilizing roll and leveling roll. For convenience in calculation and expression, the calculation sections are firstly divided into the sink roll, the stabilizing roll, the correcting roll and the surrounding zinc liquid of the strip steel, the strip steel is used as a reference for division, and the calculation sections are respectively divided into seven sections such as a strip steel section I, II, III, IV, V, VI, VII, wherein the strip steel sections II, IV and VI respectively comprise the sink roll, the stabilizing roll and the correcting roll, the strip steel sections without the rolls are I, III, V, VII, and are numbered in sequence, i=1, 2,3 and 4 respectively. At the same time, the inlet end, outlet end and rotating boundary layer around the roller system need to be divided, as shown in fig. 2. The sink roll inlet, outlet and surrounding rotating boundary layers are divided as shown in fig. 2 (a), the corrective roll inlet, outlet and surrounding rotating boundary layers are divided as shown in fig. 2 (b), and the stabilizer roll inlet, outlet and surrounding rotating boundary layers are divided as shown in fig. 2 (c).
Example 1:
aiming at the thin strip steel with the strip steel specification smaller than or equal to 0.3mm, calculating the viscous resistance of the strip steel and the roller in the zinc pot under the low-speed condition, and further realizing the control of the viscous state of the roller system in the zinc pot based on the calculated viscous resistance. As shown in fig. 3, the method for controlling the viscous state of the roller system in the zinc pot in the hot galvanizing process provided by the embodiment of the invention comprises the following steps:
A1, collecting parameters of zinc pot roller system equipment and physical parameters of zinc liquid and strip steel, including sinking roller, stabilizing roller and correcting roller radius R c ＝0.3m、R w ＝0.1m、R q The length of the roller is l=1.2m=0.1, and the zinc liquid density ρ in the zinc pot at high temperature is low Zn ＝6500kg/m 3 Dynamic viscosity η=3.75x10 of zinc liquid in zinc pot -5 Pa.s, density ρ of strip steel in zinc pot at high temperature Fe ＝7850kg/m 3 Distance S of roll gap zinc liquid 0 Vertical distance S between sink roll and leveling roll =1.5m 1 Vertical distance S between leveling roller and stabilizing roller =0.7m 2 Vertical distance S between stabilizing roll and zinc liquid =0.5m 3 Surface friction coefficient mu between strip steel and sink roll, correcting roll and stabilizing roll c ＝0.02、μ q ＝0.03、μ w =0.03 critical viscous resistance of zinc bath to strip steel [ F]=950N, the lowest temperature { T of the zinc liquid in the zinc pot in normal working state zn } min =420 ℃, maximum temperature { T zn } max Temperature output value T of zinc pot under optimal condition of viscous state of sinking roller system at 480 DEG C * ＝0。
Step B1, collecting strip steel production process parameters including the running speed V=120 m/min, the width B=1000 mm of the strip steel and the thickness H=0.3 mm of the strip steel, and the initial wrap angle theta of the strip steel and the sinking roller c0 Inlet end wrap angle θ of strip steel and sink roll contact in Critical insertion x of rotation of stabilizing roller and correcting roller =40° * Maximum set insertion amount x of stabilizing roller and leveling roller =1.2mm max Allowable value of strip steel swing amplitude at outlet of galvanization process [ A ]]＝5mm；
Step C1, calculating viscous resistance of the sinking roller and zinc liquid around the contact strip steel:
as shown in fig. 4, the method specifically comprises the following steps:
c11, setting the insertion amount of the correction roller and the stabilizing roller, comprising:
setting initial value x of the insertion quantity of the correction roller and the stabilizing roller q0 ＝0mm、x w0 =0mm; setting a correction roller and a stabilizing roller insertion amount change increment Δx=0.1 mm; setting an insertion increment delta x and an initial value j of an increment process variable 1 ＝0、j 2 ＝0；
Calculating the increment step number n of the insertion amount:
calculating the correction roller insertion amount x q ：x q ＝x q0 +j 1 Δx=0.1 mm; calculating the insertion amount x of the stabilizing roller w ：x w ＝x w0 +j 2 Δx＝0.1mm；
Judging that the insertion amount satisfies the non-rotation condition x q ≤x * Whether or not it is true, if x q ≤x * If so, judging that the insertion amount satisfies the non-rotation condition x w ≤x * Whether or not it is true, if x w ≤x * If so, judging the swing condition of the strip steel at the outlet of the unit; if x q ≤x * If not, the step of setting the initial value of the insertion quantity of the correction roller and the stabilizing roller is shifted; if x w ≤x * If not, the process proceeds to the step of setting initial values of the correction roller and the stabilizing roller insertion amounts.
Wherein, judge unit export belted steel swing condition includes:
measuring swing amplitude A of strip steel at unit outlet under current condition 1 =6mm; judging whether the swing amplitude of strip steel at the outlet of the unit meets the condition 1: a is that 1 ≤[A]Whether or not to establish; if the condition 1 is satisfied, the step of setting the change increment of the inserting amount of the correcting roller and the stabilizing roller is shifted to; if the condition 1 is not satisfied, the condition 2 is determined: j (j) 2 N is not more than n; if condition 2 is satisfied, let j 2 ＝j 2 +1, and transferring to calculate the amount of stabilizer roller insertion; if the condition 2 is not satisfied, the condition 3 is determined: j (j) 1 N is not more than n; if condition 3 is satisfied, let j 1 ＝j 1 +1, and transfer to calculate corrective roller insertsA step of inputting amount; if the condition 3 is not satisfied, the process proceeds to a step of setting initial values of the corrective roller and the stabilizer roller insertion amount.
C12, calculating the wrap angle theta of the sinking roller, the stabilizing roller and the correcting roller of the strip steel c 、θ w 、θ q ：
C13, calculating viscous resistance F of each section of strip steel without roller in translation i (i=1, 2,3, 4), and the calculation results are shown in table 1.
TABLE 1
C14, measuring hot galvanizing process inlet T in 13345N tension T of exit strip without rotation of the submerged rolls outc ＝14823N；
C15, calculating the sliding friction force f between the strip steel and the correction roller and between the strip steel and the stabilizing roller according to the Newton's second law of motion along the radial direction of the roller surface q 、f w ：
C16 reverse solving of screw-in end tension T of sink roll c End pull-out tension T' c ：
C17, calculating the viscous resistance F of the sink roll and the strip steel contacted with the sink roll according to the Euler theorem c ：
In the method, in the process of the invention, 
To the tension of the strip at the roll-out end of the submerged roll without taking viscous resistance into consideration.
Step D1, calculating viscous resistance of zinc liquid around the correction roller and the contact strip steel;
as shown in fig. 5, the method specifically comprises the following steps:
d11, setting the correction roller and the stabilizing roller insertion amount, comprising:
setting initial value x 'of correcting roller and stabilizing roller insertion quantity' q0 ＝1.2mm、x′ w0 =0mm; setting a correction roller and a stabilizing roller insertion amount variation increment Δx' =0.1 mm; setting an initial value j 'of an insertion amount increment process variable' 1 ＝0、j′ 2 ＝0；
Calculating an increment step number n':
calculating the insertion amount x 'of the correction roller' q ：x′ q ＝x′ q0 +j′ 1 Δx' =1.2 mm; calculating the insertion amount x 'of the stabilizing roller' w ：x′ w ＝x′ w0 +j′ 2 Δx′＝0mm；
Judging that the insertion amount satisfies a rotation condition x' q ＞x * Whether or not to establish; if x' q ＞x * If so, judging that the insertion amount satisfies the non-rotation condition x' w ≤x * Whether or not to establish; if x' q ＞x * If not, the step of setting the initial value of the insertion quantity of the correction roller and the stabilizing roller is shifted; if x' w ≤x * If so, judging the swing condition of the strip steel at the outlet of the unit; if x' w ≤x * If not, the step of setting the initial value of the insertion quantity of the correction roller and the stabilizing roller is shifted;
wherein, judge unit export belted steel swing condition includes:
measuring swing amplitude A of strip steel at unit outlet under current condition 2 =6mm; judging whether the swing amplitude of the strip steel at the outlet of the unit meets the condition 4: A 2 ≤[A]Whether or not to establish; if condition 4 is satisfied, go to D12; if the condition 4 is not satisfied, the judgment condition 5: j' 2 N 'is not more than n'; if condition 5 is satisfied, let j' 2 ＝j′ 2 +1 and switching to a step of calculating the amount of insertion of the stabilizing roller; if the condition 5 is not satisfied, the judgment condition 6: j' 1 N 'is not more than n'; if condition 6 is satisfied, let j' 1 ＝j′ 1 +1 and switching to a step of calculating the amount of correction roller insertion; if the condition 6 is not satisfied, the process proceeds to a step of setting initial values of the corrective roller and the stabilizer roller insertion amount.
D12, calculating the wrap angle theta 'of the sinking roller, the stabilizing roller and the correcting roller of the strip steel' c 、θ′ w 、θ′ q ：
D13, under the condition, calculating viscous resistance of each section of strip steel without rollers in translation to calculate F' i (i=1, 2,3, 4), and the calculation results are shown in table 2.
TABLE 2
D14, measuring tension T of outlet strip steel under the conditions that the sink roll, the correction roll and the stabilizing roll do not rotate in the hot galvanizing process outq ＝14910N；
D15, calculating the sliding friction force f ' between the strip steel and the stabilizing roller according to the Newton's second law of motion along the radial direction of the roller surface ' w ：
D16, reversely solving the screw-in end tension T of the correcting roller q End pull-out tension T' q ：
D17, calculating the correction roller and the viscous resistance F of the strip steel contacted with the correction roller according to the Euler theorem q ：
In the method, in the process of the invention,
to correct the tension of the strip at the roll's roll-out end without taking viscous drag into consideration.
E1, calculating viscous resistance of zinc liquid around the stabilizing roller and the contact strip steel:
as shown in fig. 6, the method specifically comprises the following steps:
e11, setting the insertion amount of the correction roller and the stabilizing roller, comprising:
setting initial value x' of correcting roller and stabilizing roller insertion quantity q0 ＝1.2mm、x″ w0 =1.2mm; setting a correction roller and a stabilizing roller insertion amount variation increment Δx' =0.1 mm; setting initial value j' of incremental process variable of insertion quantity 1 ＝0、j″ 2 ＝0；
Calculating the increment step number n':
calculate the insertion quantity x' of correction roller q ：x″ q ＝x″ q0 +j″ 1 Δx "=1.2 mm; calculating the insertion amount x' of the stabilizing roller w ：x″ w ＝x″ w0 +j″ 2 Δx″＝1.2mm；
Judging that the insertion quantity meets the rotation condition x q ＞x * Whether or not to establish; if x% q ＞x * If so, determining that the insertion amount satisfies the rotation condition x w ＞x * Whether or not to establish; if x% q ＞x * If not, the step of setting the initial value of the insertion quantity of the correction roller and the stabilizing roller is shifted; if x% w ＞x * If true, judging machineThe swing condition of the strip steel at the group outlet; if x% w ＞x * If not, the step of setting the initial value of the insertion quantity of the correction roller and the stabilizing roller is shifted;
wherein, judge unit export belted steel swing condition includes:
measuring swing amplitude A of strip steel at unit outlet under current condition 3 =4mm; judging whether the swing amplitude of strip steel at the outlet of the unit meets the condition 7: a is that 3 ≤[A]Whether or not to establish; if the condition 7 is satisfied, the step E12 is shifted to; if the condition 7 is not satisfied, the judgment condition 8: j' 2 Whether n 'is less than or equal to n' is established; if condition 8 is satisfied, let j 2 ＝j″ 2 +1, and switching to a step of calculating the amount of insertion of the stabilizing roller; if the condition 8 is not satisfied, the judgment condition 9: j' 1 Whether n 'is less than or equal to n' is established; if condition 9 is satisfied, let j 1 ＝j″ 1 +1, and switching to a step of calculating the correction roller insertion amount; if the condition 9 is not satisfied, the process proceeds to a step of setting initial values of the corrective roller and the stabilizer roller insertion amount.
E12, calculating the wrap angles theta' of the sinking roller, the stabilizing roller and the correcting roller of the strip steel c 、θ″ w 、θ″ q ：
E13, calculating the viscous resistance F' of each section of the strip steel without the roller in translation under the condition i (i=1, 2,3, 4), and the calculation results are shown in table 3.
TABLE 3 Table 3
E14, measuring tension T of outlet strip steel under the condition that three rollers rotate in hot galvanizing process outw ＝15120N；
E15, reversely solving the screw-in end tension T of the stabilizing roller w End pull-out tension T' w ：
E16, calculating the viscous resistance F of the stabilizing roller and the strip steel contacted with the stabilizing roller according to the Euler theorem w ：
In the method, in the process of the invention,
to correct the tension of the strip at the roll's roll-out end without taking viscous drag into consideration.
Step F1, calculating total viscous resistance F of strip steel along the hot galvanizing process s ：
F s ＝F″ 1 +F″ 2 +F″ 3 +F″ 4 +F c +F q +F w ＝873.9N；
The viscous drag measurements were compared according to the calculation procedure and field described above, as shown in table 4.
TABLE 4 Table 4
Aiming at the working condition of the embodiment 1, the method is very effective in the viscous drag of the strip steel in the hot galvanizing process, the relative error of the viscous drag of each section and each roller section of the strip steel is within 15 percent, and the relative error of the total viscous drag is less than 10 percent. The calculation result meets the accuracy requirement of 15% of the unit, and meets the accuracy requirement of the unit under the low-speed condition.
And G1, controlling the temperature of the zinc liquid in the zinc pot based on the total viscous resistance of the strip steel along the hot galvanizing process, thereby realizing the control of the viscous state of the roller system in the zinc pot in the hot galvanizing process.
The method specifically comprises the following steps:
g11, measuring the temperature T of zinc liquid in a zinc pot zn =470 ℃, and sets initial values of temperature control variable j and temperature change amount Δt: j=1, Δt=5 ℃, calculate temperature control step m:
g12, controlling the viscous state of a roller system in a zinc pot, comprising:
judgment F s ≤[F]Whether or not to establish; if F s ≤[F]If true T * ＝T zn The method comprises the steps of carrying out a first treatment on the surface of the If F s ≤[F]Not true, T * ＝T zn +j.DELTA.T, and judging whether j is less than or equal to m; if j is less than or equal to m, j=j+1 is set and the roll system viscous resistance calculation process is carried out (step C1); if j is not less than or equal to m, output T * ＝450℃。
Wherein, the viscous resistance F' of each section of the strip steel without rollers in the steps C13, D13 and E13 during translation i As shown in fig. 7, the calculation process of (a) specifically includes the following steps:
(1) Input roller, zinc pot equipment parameters and strip steel technological parameters including sinking roller, stabilizing roller and correcting roller radius R c 、R w 、R q Sink roll screw-in end wrap angle theta cin Correcting roller insertion amount x q Amount of inserted stabilizing roller x w Distance S of roll gap zinc liquid 0 Vertical distance S between sink roll and leveling roll 1 Vertical distance S between correction roller and stabilizing roller 2 Vertical distance S between stabilizing roller and molten zinc 3 The speed V of the strip steel, the viscosity eta of the zinc liquid and the density rho of the zinc liquid in a zinc pot at high temperature Zn The width B of the strip steel;
(2) Calculating effective overcurrent length delta of each section of strip steel without roller i (i＝1,2,3,4)：
(3) Sequentially measuring the flow velocity v of molten zinc around each section of strip without roller i (i=1, 2,3, 4), and calculates the relative velocity difference Δv between the strip and the surrounding zinc liquid i ＝V-v i (i＝1,2,3,4)；
(4) Setting the initial value i=1 of the serial numbers of each section of the strip steel without the roller;
(5) Calculating the Reynolds number Re i ：
(6) Judging the boundary layer fluid type of the strip steel section: judging Re i ≤5×10 5 Whether or not to establish; if Re is i ≤5×10 5 Established, boundary layer thickness calculation mode 1 is used: l (L) i ＝4.64δ i (Re i ) -1/2 Calculating; if Re is i ≤5×10 5 If not, using boundary layer thickness calculation mode 2:
calculating;
(7) Calculating viscous resistance F of each section of strip steel without roller in translation i ：
Wherein k is the working condition coefficient of the galvanization process;
(8) Judging whether i is less than or equal to 4 or not; if i.ltoreq.4 is true, let i=i+1 and go to (5); if i is less than or equal to 4, outputting viscous resistance F of each section of strip steel without roller in translation i (i＝1,2,3,4)。
Example 2:
aiming at the strip steel with the strip steel specification of more than 0.3mm, calculating the viscous resistance of the strip steel and the roller in the zinc pot under the high-speed condition, and further realizing the control of the viscous state of the roller system in the zinc pot based on the calculated viscous resistance. The embodiment of the invention provides a method for controlling the viscous state of a roller system in a zinc pot in a hot galvanizing process, which comprises the following steps:
Step A2, collecting parameters of zinc pot roller system equipment, zinc liquid and physical parameters of strip steel, including sedimentationRoller-free, stabilizing and leveling roller radius R c ＝0.3m、R w ＝0.1m、R q The length of the roller is l=1.6m=0.1, and the zinc liquid density ρ in the zinc pot at high temperature is low Zn ＝6500kg/m 3 Dynamic viscosity η=3.75x10 of zinc liquid in zinc pot -5 Pa.s, density ρ of strip steel in zinc pot at high temperature Fe ＝7850kg/m 3 Distance S of roll gap zinc liquid 0 Vertical distance S between sink roll and leveling roll =1.5m 1 Vertical distance S between leveling roller and stabilizing roller =0.7m 2 Vertical distance S between stabilizing roll and zinc liquid =0.5m 3 Surface friction coefficient mu between strip steel and sink roll, correcting roll and stabilizing roll c ＝0.05、μ q ＝0.07、μ w =0.09; critical viscous resistance of zinc liquid of zinc pot to strip steel [ F ]]=950N, the lowest temperature { T of the zinc liquid in the zinc pot in normal working state zn } min =420 ℃, maximum temperature { T zn } max Temperature output value T of zinc pot under optimal condition of viscous state of sinking roller system at 480 DEG C * ＝0。
Step B2, collecting strip steel production process parameters including the running speed V=135 m/min of the strip steel, the width B=1200 mm of the strip steel and the thickness H=0.5 mm of the strip steel, and the initial wrap angle theta of the strip steel and the sinking roller c0 Inlet end wrap angle θ of strip steel to sink roll contact =128° in Critical insertion x of rotation of stabilizing roller and correcting roller =40° * Maximum set insertion amount x of stabilizing roller and leveling roller =1.8mm max Allowable value of strip swing amplitude at outlet of galvanization process [ A ]]＝4mm；
Step C2, calculating viscous resistance of the sinking roller and zinc liquid around the contact strip steel:
c21, setting the insertion amount of the correction roller and the stabilizing roller, comprising:
setting initial value x of the insertion quantity of the correction roller and the stabilizing roller q0 ＝0mm、x w0 =0mm; setting a correction roller and a stabilizing roller insertion amount change increment Δx=0.1 mm; setting an insertion increment delta x and an initial value j of an increment process variable 1 ＝0、j 2 ＝0；
Calculating the increment step number n of the insertion amount:
calculating the correction roller insertion amount x q ：x q ＝x q0 +j 1 Δx=0.1 mm; calculating the insertion amount x of the stabilizing roller w ：x w ＝x w0 +j 2 Δx＝0.1mm；
Judging that the insertion amount satisfies the non-rotation condition x q ≤x * Whether or not to establish; if x q ≤x * If so, judging that the insertion amount satisfies the non-rotation condition x w ≤x * Whether or not it is true, if x q ≤x * If not, the step of setting the initial value of the insertion quantity of the correction roller and the stabilizing roller is shifted; if x w ≤x * If so, judging the swing condition of the strip steel at the outlet of the unit; if x w ≤x * If not, the step of setting the initial value of the insertion quantity of the correction roller and the stabilizing roller is shifted;
wherein, judge unit export belted steel swing condition includes: measuring swing amplitude A of strip steel at unit outlet under current condition 1 =7mm; judging whether the swing amplitude of strip steel at the outlet of the unit meets the condition 1: a is that 1 ≤[A]Whether or not to establish; if the condition 1 is satisfied, the step of setting the change increment of the inserting amount of the correcting roller and the stabilizing roller is shifted to; if the condition 1 is not satisfied, the condition 2 is determined: j (j) 2 N is not more than n; if condition 2 is satisfied, let j 2 ＝j 2 +1, and switching to a step of calculating the amount of insertion of the stabilizing roller; if the condition 2 is not satisfied, the condition 3 is determined: j (j) 1 If n is not more than n, if condition 3 is satisfied, let j 1 ＝j 1 +1, and switching to a step of calculating the correction roller insertion amount; if the condition 3 is not satisfied, the process proceeds to a step of setting initial values of the corrective roller and the stabilizer roller insertion amount.
C22, calculating the wrap angle theta of the sinking roller, the stabilizing roller and the correcting roller of the strip steel c 、θ w 、θ q ：
C23, calculating each zone of the strip without the rollerViscous drag force F during segment translation i (i=1, 2,3, 4), the calculation procedure was the same as in example 1, and the calculation results are shown in table 5.
TABLE 5
C24, measuring hot galvanizing process inlet T in 16145N, tension T of the exit strip under the condition that the submerged roller rotates and the remaining two rollers do not rotate outc ＝18835N；
C25, calculating the sliding friction force f between the strip steel and the correction roller and between the strip steel and the stabilizing roller according to the Newton's second law of motion along the radial direction of the roller surface q 、f w ：
C26 reverse solving of screw-in end tension T of sink roll c End pull-out tension T' c ：
C27, calculating the viscous resistance F of the sink roll and the strip steel contacted with the sink roll according to the Euler theorem c ：
In the method, in the process of the invention,
to the tension of the strip at the roll-out end of the submerged roll without taking viscous resistance into consideration.
Step D2, calculating viscous resistance of zinc liquid around correction roller and strip steel contacted therewith
D21, setting the correction roller and the stabilizing roller insertion amount, comprising:
setting correctionInitial value x 'of insertion amount of positive roller and stabilizing roller' q0 ＝1.8mm、x′ w0 =0mm; setting a correction roller and a stabilizing roller insertion amount variation increment Δx' =0.1 mm; setting an initial value j 'of an insertion amount increment process variable' 1 ＝0、j′ 2 ＝0；
Calculating an increment step number n':
calculating the insertion amount x 'of the correction roller' q ：x′ q ＝x′ q0 +j′ 1 Δx' =1.8 mm; calculating the insertion amount x 'of the stabilizing roller' w ：x′ w ＝x′ w0 +j′ 2 Δx′＝0mm；
Judging that the insertion amount satisfies a rotation condition x' q ＞x * Whether or not to establish; if x' q ＞x * If so, judging that the insertion amount satisfies the non-rotation condition x' w ≤x * Whether or not to establish; if x' q ＞x * If not, the step of setting the initial value of the insertion quantity of the correction roller and the stabilizing roller is shifted; if x' w ≤x * If so, judging the swing condition of the strip steel at the outlet of the unit; if x' w ≤x * If not, the step of setting the initial value of the insertion quantity of the correction roller and the stabilizing roller is shifted;
wherein, judge unit export belted steel swing condition includes:
measuring swing amplitude A of strip steel at unit outlet under current condition 2 =5.5 mm; judging whether the swing amplitude of the strip steel at the outlet of the unit meets the condition 4: a is that 2 ≤[A]Whether or not to establish; if the condition 4 is satisfied, the step D22 is carried out; if the condition 4 is not satisfied, the judgment condition 5: j' 2 N 'is not more than n'; if condition 5 is satisfied, let j' 2 ＝j′ 2 +1 and switching to a step of calculating the amount of insertion of the stabilizing roller; if the condition 5 is not satisfied, the judgment condition 6: j' 1 N 'is not more than n'; if condition 6 is satisfied, let j' 1 ＝j′ 1 +1 and switching to a step of calculating the amount of correction roller insertion; if the condition 6 is not satisfied, the process proceeds to a step of setting initial values of the corrective roller and the stabilizer roller insertion amount.
D22, calculating the wrap angle theta 'of the sinking roller, the stabilizing roller and the correcting roller of the strip steel' c 、θ′ w 、θ′ q
D23, under the condition, calculating viscous resistance of each section of strip steel without rollers in translation to calculate F' i (i=1, 2,3, 4), the calculation procedure was the same as in example 1, and the calculation results thereof are shown in table 6.
TABLE 6
D24, measuring the tension T of the outlet strip steel under the conditions that the sink roll, the correction roll and the stabilizing roll do not rotate in the hot galvanizing process outq ＝18976N；
D25, calculating the sliding friction force f ' between the strip steel and the stabilizing roller according to the Newton's second law of motion along the radial direction of the roller surface ' w ：
D26, reversely solving screw-in end tension T of correction roller q End pull-out tension T' q ：
D27, calculating the viscous drag F of the correction roller and the strip steel contacted with the correction roller according to the Euler theorem q ：
In the method, in the process of the invention,
to correct the tension of the strip at the roll's roll-out end without taking viscous drag into consideration.
E2, calculating viscous resistance of zinc liquid around the stabilizing roller and the contact strip steel:
e21, setting the correction roller and the stabilizing roller insertion amount, comprising:
setting initial value x' of correcting roller and stabilizing roller insertion quantity q0 ＝1.8mm、x″ w0 =1.8mm; setting a correction roller and a stabilizing roller insertion amount variation increment Δx' =0.1 mm; setting initial value j' of incremental process variable of insertion quantity 1 ＝0、j″ 2 ＝0；
Calculating the increment step number n':
calculate the insertion quantity x' of correction roller q ：x″ q ＝x″ q0 +j″ 1 Δx "=1.8 mm; calculating the insertion amount x' of the stabilizing roller w ：x″ w ＝x″ w0 +j″ 2 Δx″＝1.8mm；
Judging that the insertion quantity meets the rotation condition x q ＞x * Whether or not to establish; if x% q ＞x * If so, determining that the insertion amount satisfies the rotation condition x w ＞x * Whether or not to establish; if x% q ＞x * If not, the step of setting the initial value of the insertion quantity of the correction roller and the stabilizing roller is shifted; if x% w ＞x * If so, judging the swing condition of the strip steel at the outlet of the unit; if x% w ＞x * If not, the step of setting the initial value of the insertion quantity of the correction roller and the stabilizing roller is shifted;
wherein, judge unit export belted steel swing condition includes:
measuring swing amplitude A of strip steel at unit outlet under current condition 3 =5 mm; judging whether the swing amplitude of strip steel at the outlet of the unit meets the condition 7: a is that 3 ≤[A]Whether or not to establish; if the condition 7 is satisfied, the step E12 is shifted to; if the condition 7 is not satisfied, the judgment condition 8: j' 2 Whether n 'is less than or equal to n' is established; if condition 8 is satisfied, let j″ 2 ＝j″ 2 +1, and switching to a step of calculating the amount of insertion of the stabilizing roller; if the condition 8 is not satisfied, the judgment condition 9: j' 1 Whether n 'is less than or equal to n' is established; if condition 9 is satisfied, let j 1 ＝j″ 1 +1, and switching to a step of calculating the correction roller insertion amount; if the condition 9 is not satisfied, the process proceeds to a step of setting initial values of the corrective roller and the stabilizer roller insertion amount.
E22, calculating the wrap angles theta' of the sinking roller, the stabilizing roller and the correcting roller of the strip steel c 、θ″ w 、θ″ q ：
E23, calculating viscous resistance F' of each section of strip steel without roller in translation under the condition i (i=1, 2,3, 4), the calculation procedure was the same as in example 1, and the calculation results are shown in table 7.
TABLE 7
E24, measuring the tension T of the strip steel under the condition that the hot galvanizing process outlet rotates on three rollers outw ＝19120N；
E25, reversely solving the screw-in end tension T of the stabilizing roller w End pull-out tension T' w ：
E26, calculating the viscous resistance F of the stabilizing roller and the strip steel contacted with the stabilizing roller according to the Euler theorem w ：
In the method, in the process of the invention,
-correcting the strip tension at the roll's roll-out end without taking into account viscous drag.
Step F2, calculating total viscous resistance F of strip steel along the hot galvanizing process s ：
F s ＝F 1 ″+F 2 ″+F 3 ″+F 4 ″+F c +F q +F w ＝873.9N；
The viscous drag measurements were compared according to the calculation procedure and field described above, as shown in table 8.
TABLE 8
Aiming at the working condition of the embodiment 2, the viscous resistance of the strip steel in the hot galvanizing process is very effective by adopting the method of the patent, the relative error of the viscous resistance of each section and each roller section of the strip steel is within 15 percent, and the relative error of the total viscous resistance is less than 10 percent. The calculation result meets the accuracy requirement of 15% of the unit, and meets the accuracy requirement of the unit under the high-speed condition.
And G2, controlling the temperature of the zinc liquid in the zinc pot based on the total viscous resistance of the strip steel along the hot galvanizing process, thereby realizing the control of the viscous state of the roller system in the zinc pot in the hot galvanizing process.
The method specifically comprises the following steps:
g21, measuring the temperature T of zinc liquid in a zinc pot zn =450 ℃, and sets initial values of temperature control variable j and temperature change amount Δt: j=1, Δt=5 ℃, calculate temperature control step m:
g22, controlling the viscous state of a roller system in a zinc pot, comprising:
judgment F s ≤[F]Whether or not to establish; if F s ≤[F]If true T * ＝T zn The method comprises the steps of carrying out a first treatment on the surface of the If F s ≤[F]Not true, T * ＝T zn +j.DELTA.T, and judging whether j is less than or equal to m; if j is less than or equal to m, j=j+1 is set and the roll system viscous resistance calculation process is carried out (step C2); if j is not less than or equal to m, output T * ＝475℃。
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (9)
1. The method for controlling the viscous state of the roller system in the zinc pot in the hot galvanizing process is characterized by comprising the following computer-implemented steps:
dividing calculation sections for the zinc liquid around the sink roll, the stabilizing roll, the correcting roll and the strip steel;
calculating viscous resistance of each roller and zinc liquid around the strip steel contacted with each roller in sequence in the galvanization process flow according to each roller in the roller system, and simultaneously adjusting the other two rollers to be small in insertion amount so as to prevent rotation and enable the other two rollers to be in a sliding friction state just contacted with the strip steel;
calculating total viscous resistance of the strip steel along the process of hot galvanizing based on the viscous resistance of the zinc liquid around each roller and the strip steel contacted with the roller;
controlling the temperature of zinc liquid in the zinc pot based on the total viscous resistance of the strip steel along the process of hot galvanizing, thereby realizing the control of the viscous state of a roller system in the zinc pot in the hot galvanizing process;
wherein, calculate each roller and with this roller contact belted steel surrounding zinc liquid viscous resistance, include:
setting the insertion amount of the correction roller and the stabilizing roller;
calculating the wrap angles of the strip steel sink roll, the stabilizing roll and the correcting roll according to the insertion amounts of the correcting roll and the stabilizing roll;
calculating viscous resistance of each section of the strip steel without the roller in translation;
measuring the tension of the strip steel at the inlet and the outlet of the hot galvanizing unit;
And reversely solving the viscous resistance of the strip steel and the roller in the rotation process based on the strip steel tension at the inlet and outlet of the unit and the viscous resistance of the strip steel in the translational state along the path.
2. The method for controlling the viscous state of a roller system in a zinc pot in a hot galvanizing process according to claim 1, wherein the calculation of the viscous resistance of each roller and the molten zinc around the strip steel contacted with each roller is performed sequentially according to the sequence of each roller in the roller system in the galvanization process flow, and comprises the following steps:
calculating the viscous resistance of the sinking roller and the zinc liquid around the strip steel contacted with the sinking roller;
under the condition of keeping the tension and the belt speed of the strip steel at the inlet of the hot galvanizing unit unchanged, calculating the correction roller and the viscous resistance of the zinc liquid around the strip steel contacted with the correction roller;
and under the condition of keeping the tension and the belt speed of the strip steel at the inlet of the hot galvanizing unit unchanged, calculating the viscous resistance of the stabilizing roller and the zinc liquid around the strip steel contacted with the stabilizing roller.
3. The method for controlling the viscous state of a roller system in a zinc pot in a hot galvanizing process according to claim 1, wherein calculating the viscous resistance of each section of the strip steel without rollers during translation comprises:
s1, inputting parameters of equipment of a roller and a zinc pot and technological parameters of strip steel, wherein the parameters comprise the radius R of a sink roller, a stabilizing roller and a correcting roller c 、R w 、R q The unit is m, and the wrap angle theta of the rotation end of the sink roll cin In units of °x, the amount of roller insertion is corrected q In mm, the amount of inserted stabilizing roller x w The unit is mm, and the distance S between the rolls is equal to that of zinc liquid 0 The unit is m, and the vertical distance S between the sinking roller and the correcting roller 1 The unit is m, and the vertical distance S between the correcting roller and the stabilizing roller 2 The unit is m, and the vertical distance S between the stabilizing roller and the molten zinc 3 The unit is m, the strip steel speed V, the unit is m/min, the zinc liquid viscosity eta, and the zinc liquid density rho in a zinc pot at high temperature Zn The width B of the strip steel is in mm;critical viscous resistance of zinc liquid of zinc pot to strip steel [ F ]]The unit is N, and the lowest temperature { T ] of zinc liquid in a zinc pot under normal working state zn } min Maximum temperature { T } zn } max The unit is the temperature output value T of the zinc pot under the optimal condition of the viscous state of the sinking roller system * The units are in degrees celsius;
s2, calculating effective overcurrent length delta of each section of the strip steel without the roller i Units are m, i=1, 2,3,4:
s3, sequentially measuring the flow velocity v of the zinc liquid around each section of the strip steel without the roller i The unit is m/min, i=1, 2,3,4, and the relative speed difference Deltav of the strip steel and the surrounding zinc liquid is calculated i ＝V-v i The units are m/min, i=1, 2,3,4;
s4, setting the initial value i=1 of the serial numbers of each section of the strip steel without the roller;
s5, calculating Reynolds number Re i ：
S6, judging the boundary layer fluid type of the strip steel section: judging Re i ≤5×10 5 Whether or not to establish; if Re is i ≤5×10 5 Established, boundary layer thickness calculation mode 1 is used: l (L) i ＝4.64δ i (Re i ) -1/2 Calculating, wherein the unit is m; if Re is i ≤5×10 5 If not, using boundary layer thickness calculation mode 2:
calculating, wherein the unit is m;
s7, calculating viscous resistance F of each section of strip steel without roller in translation i ：
The unit is N; wherein the method comprises the steps ofK is a working condition coefficient of the galvanization process;
s8, judging whether i is less than or equal to 4 or not; if i.ltoreq.4 is true, let i=i+1 and go to S5; if i is less than or equal to 4, outputting viscous resistance F of each section of strip steel without roller in translation i The unit is N, i=1, 2,3,4.
4. The method for controlling the viscous state of a roller system in a zinc pot in a hot galvanizing process according to claim 1, wherein the method for reversely solving the viscous resistance of the strip steel and the roller in the rotation process based on the tension of the strip steel at the inlet and the outlet of a hot galvanizing unit and the viscous resistance of the strip steel in the translational state along the path comprises the following steps:
calculating sliding friction force between the strip steel and other rollers according to Newton's second law of motion along the radial direction of the roller surface;
the tension of the screwing-in end and the tension of the unscrewing end of the roller are reversely calculated based on the tension of the strip steel at the inlet and the outlet of the hot galvanizing unit, viscous resistance of the strip steel in the state of translational motion along the path and sliding friction force between the strip steel and other rollers;
The viscous drag of the roll and the strip in contact with the roll is calculated based on the roll's in-end tension, out-end tension, the roll's surface friction coefficient, and wrap angle according to the euler theorem.
5. The method for controlling the viscous state of a roller system in a zinc pot in a hot galvanizing process according to claim 4, wherein the method for controlling the viscous state of the roller system in the zinc pot in the hot galvanizing unit is characterized by reversely solving the tension of the screwing-in end and the tension of the unscrewing end of the roller based on the tension of the strip steel at an inlet of the hot galvanizing unit, the tension of the strip steel at an outlet of the hot galvanizing unit, the viscous resistance of the strip steel in a translational state along the path and the sliding friction force between the strip steel and other rollers, and comprises the following steps:
screw-in end tension T of sink roll c And the unscrewing end tension T c ' is:
screw-in end tension T of correction roller q And the unscrewing end tension T q ' is:
screw-in end tension T of stabilizing roller w And the unscrewing end tension T w ' is:
wherein T is in The unit of the tension of the strip steel at the inlet of the hot galvanizing unit is N and T outc The unit of the tension of strip steel at the outlet of the hot galvanizing unit is N under the condition that the sinking roller rotates and the other two rollers do not rotate; t (T) outq The strip steel tension at the outlet of the hot galvanizing unit is the same as that of the dip roll and the correction roll which rotate under the condition that the stabilizing roll does not rotate; t (T) outw The unit is N, which is the tension of strip steel at the outlet of a hot galvanizing unit under the condition that three rollers rotate; f (f) q 、f w 、F i The viscous drag of each section of the strip steel without the roller is N, i=1, 2,3 and 4 when sliding friction force between the strip steel and the correcting roller and sliding friction force between the stabilizing roller are calculated when the sinking roller and the viscous drag of the zinc liquid around the strip steel contacted with the sinking roller are respectively calculated; the unit is N.
6. The method for controlling the viscous state of a roller system in a zinc pot in a hot galvanizing process according to claim 5, wherein calculating the viscous resistance of the roller and the strip steel in contact with the roller based on the tension of the screw-in end, the tension of the screw-out end, the surface friction coefficient of the roller and the wrap angle of the roller according to the euler theorem comprises:
calculating viscous resistance F of sinking roller and strip steel contacted with sinking roller c ：
Calculating the viscous resistance F of the correction roller and the strip steel contacted with the correction roller q ：
Calculating viscous resistance F of stabilizing roller and strip steel contacted with stabilizing roller w ：
Wherein T is c ′ * 、T q ′ * 、T w ′ * Respectively representing the strip steel tension of the unscrewing ends of the sink roll, the correcting roll and the stabilizing roll under the condition of not considering viscous resistance, wherein the unit is N; θ c 、θ w 、θ q The wrap angles of the strip steel sink roll, the stabilizing roll and the correcting roll are respectively shown in the unit of an angle degree; mu (mu) c 、μ q 、μ w The friction coefficients of the surfaces of the strip steel, the sinking roller, the correcting roller and the stabilizing roller are respectively.
7. The method for controlling the sticking state of a roll system in a zinc pot in a hot galvanizing process according to claim 4, wherein the dip roll, the stabilizing roll and the wrap angle θ of the leveling roll are calculated according to the insertion amounts of the leveling roll and the stabilizing roll c 、θ w 、θ q Comprising:
wherein θ c0 The initial wrap angle of the strip steel and the sinking roller is formed; r is R c 、R w 、R q The radius of each sinking roller, the stabilizing roller and the correcting roller is m; x is x q 、x w The leveling roller insertion amount and the stabilizing roller insertion amount are respectively in mm.
8. The method for controlling the viscous state of a roll system in a zinc pot in a hot galvanizing process according to claim 1, wherein calculating the total viscous resistance of the strip steel in the hot galvanizing process based on the viscous resistance of each roll and the molten zinc around the strip steel in contact with the roll comprises:
F s ＝F i +F c +F q +F w ；
wherein F is s For the total viscous resistance of the strip steel along the process of hot galvanizing, F c Is the viscous resistance of the sinking roller and the zinc liquid around the contact strip steel, F q To correct the viscous resistance of the roller and the zinc liquid around the contact strip steel, F w To stabilize the viscous resistance of the roll and the zinc liquid around the strip steel contacted with the roll, F i The viscous resistance of each section of the strip without the roller in translation is expressed in units of N, i=1, 2,3,4.
9. A method for controlling the viscous state of a roller system in a zinc pot in a hot galvanizing process according to claim 3, wherein the temperature of the zinc liquid in the zinc pot is controlled based on the total viscous resistance of the strip steel in the hot galvanizing process, thereby realizing the control of the viscous state of the roller system in the zinc pot in the hot galvanizing process, comprising the following steps:
measuring the temperature T of zinc liquid in a zinc pot zn And setting initial values j=1 of temperature control variable and variable temperature delta T, and calculating a temperature control step m:
the viscous state control of the roller system in the zinc pot comprises the following steps:
Judgment F s ≤[F]Whether or not to establish; if F s ≤[F]If true T * ＝T zn The method comprises the steps of carrying out a first treatment on the surface of the If F s ≤[F]Not true, T * ＝T zn +j.DELTA.T, and judging whether j is less than or equal to m; if j is less than or equal to m, j=j+1 is made and the roll system viscous resistance calculation process is carried out; if j is not less than or equal to m, output T * ；F s The total viscous resistance of the strip steel along the process of hot galvanizing is obtained.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2276472A1 (en) * | 1998-07-03 | 2000-01-03 | Gregory John Rajala | Method and apparatus for controlling web tension by actively controlling velocity and acceleration of a dancer roll |
| JP2000161424A (en) * | 1998-11-30 | 2000-06-16 | Okumura Corp | Damping device for structure |
| CN207891411U (en) * | 2018-01-11 | 2018-09-21 | 江苏刚正薄板科技有限公司 | A kind of strip zinc gray barrier dust-extraction unit used for hot dip galvanizing |
| CN112180113A (en) * | 2020-09-11 | 2021-01-05 | 河钢乐亭钢铁有限公司 | Device and method for measuring rotating speed of sink roller of galvanizing production line |
| CN114672753A (en) * | 2022-04-06 | 2022-06-28 | 燕山大学 | Hot galvanizing sink roller system rotation failure prediction method |
| CN114878409A (en) * | 2022-05-13 | 2022-08-09 | 施赵杰 | Hot galvanizing resistance coefficient simulation device |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100264510B1 (en) * | 1996-05-21 | 2000-09-01 | 이구택 | The process tension control method for vertical hot galvanized system |
| CN100547107C (en) * | 2007-03-22 | 2009-10-07 | 宝山钢铁股份有限公司 | The online test method of a kind of pot galvanize dip-roll sleeve and liner wear degree |
| CN203653677U (en) * | 2013-12-27 | 2014-06-18 | 北京京杰锐思技术开发有限公司 | Submerged roller device used in hot-dip galvanizing |
| CN110318013B (en) * | 2019-07-19 | 2021-07-09 | 首钢京唐钢铁联合有限责任公司 | Production method of hot-dip galvanized strip steel |
| JP7050125B2 (en) * | 2020-07-22 | 2022-04-07 | 株式会社オリジン | Damper |
| CN113652622A (en) * | 2021-08-16 | 2021-11-16 | 燕山大学 | Method and system suitable for optimizing cooling process of fan of galvanizing unit |
-
2022
- 2022-08-17 CN CN202210987690.9A patent/CN115480597B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2276472A1 (en) * | 1998-07-03 | 2000-01-03 | Gregory John Rajala | Method and apparatus for controlling web tension by actively controlling velocity and acceleration of a dancer roll |
| JP2000161424A (en) * | 1998-11-30 | 2000-06-16 | Okumura Corp | Damping device for structure |
| CN207891411U (en) * | 2018-01-11 | 2018-09-21 | 江苏刚正薄板科技有限公司 | A kind of strip zinc gray barrier dust-extraction unit used for hot dip galvanizing |
| CN112180113A (en) * | 2020-09-11 | 2021-01-05 | 河钢乐亭钢铁有限公司 | Device and method for measuring rotating speed of sink roller of galvanizing production line |
| CN114672753A (en) * | 2022-04-06 | 2022-06-28 | 燕山大学 | Hot galvanizing sink roller system rotation failure prediction method |
| CN114878409A (en) * | 2022-05-13 | 2022-08-09 | 施赵杰 | Hot galvanizing resistance coefficient simulation device |
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Effective date of registration: 20230904 Address after: No. 6899 Qiguang Street, Qian'an High tech Industrial Development Zone, Tangshan City, Hebei Province (self owned) Patentee after: Zhong'an Iron (Qian'an) Steel Plate Manufacturing Co.,Ltd. Address before: 066004 No. 438 west section of Hebei Avenue, seaport District, Hebei, Qinhuangdao Patentee before: Yanshan University |