CN108676995B - Method and device for preventing deviation of strip steel in vertical annealing furnace - Google Patents

Method and device for preventing deviation of strip steel in vertical annealing furnace Download PDF

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Publication number
CN108676995B
CN108676995B CN201810402277.5A CN201810402277A CN108676995B CN 108676995 B CN108676995 B CN 108676995B CN 201810402277 A CN201810402277 A CN 201810402277A CN 108676995 B CN108676995 B CN 108676995B
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strip steel
deviation
furnace
furnace roller
determining
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CN108676995A (en
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任伟超
李洋龙
孙健新
杨枕
王道金
李冠雄
任秋红
常树林
李振
郑晓飞
谭谨峰
詹超
雷运亭
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Shougang Jingtang United Iron and Steel Co Ltd
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Shougang Jingtang United Iron and Steel Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D11/00—Process control or regulation for heat treatments

Abstract

The embodiment of the invention provides a preventive beltThe method and the device for the deviation of the steel in the vertical annealing furnace comprise the following steps: acquiring deviation data of the strip steel in a vertical annealing furnace, and determining a first deviation factor and a second deviation factor according to the deviation data; determining deviation risk factor according to the width of the strip steel and the length of the furnace roller platform
Figure DDA0001646007290000011
Determining the maximum static friction force f of the strip steel according to the density of the strip steel, the friction coefficient between the strip steel and the furnace roller, the gravity acceleration of the strip steel, the taper angle of the furnace roller and the length of the straight section of the furnace roller; determining the centering force sigma of the strip steel according to the unit tension of the strip steel, the width of the strip steel, the taper angle of the furnace roller, the straight section length of the furnace roller and the wrap angle of the strip steelcenter(ii) a When determining the deviation risk factor
Figure DDA0001646007290000012
While, judge sigmacenterWhether f is greater than f; if σcenterIf the deviation is less than f, determining that the strip steel is snakelike deviation, and adjusting the first deviation factor according to a first adjusting standard; if the said sigmacenterAnd f, determining that the strip steel is instantaneously deflected, and adjusting a second deflection factor according to a second adjusting standard.

Description

Method and device for preventing deviation of strip steel in vertical annealing furnace
Technical Field
The invention belongs to the technical field of steel smelting, and particularly relates to a method and a device for preventing strip steel from deviating in a vertical annealing furnace.
Background
The vertical annealing furnace is mainly used for annealing treatment of acid-rolled hard rolls, so that the mechanical properties of the hard rolls meet the requirements for subsequent deep processing. The annealing treatment process mainly comprises the following steps: preheating, heating, soaking, cooling, overaging and water quenching (air cooling), in order to prevent the oxidation of the strip steel during heating, the annealing furnace is a closed space, once the strip steel deviates in the furnace, if the deviation of the strip steel cannot be found in time, the deviation of the strip steel is gradually increased, and finally a unit is forced to stop so as to prevent the strip steel from running out of a furnace roller and scraping equipment in the furnace.
Therefore, the technical problems that the deviation of the strip steel in the vertical annealing furnace causes the unit to be stopped forcibly and the production efficiency is reduced exist in the prior art.
Disclosure of Invention
Aiming at the problems in the prior art, the embodiment of the invention provides a method and a device for preventing a strip steel from deviating in a vertical annealing furnace, which are used for solving the technical problems that in the prior art, the strip steel deviates in the vertical annealing furnace, so that a unit is forced to stop and the production efficiency is reduced.
The invention provides a method for preventing a strip steel from deviating in a vertical annealing furnace, which comprises the following steps:
acquiring deviation data of the strip steel in a vertical annealing furnace, and determining a first deviation factor of snake-shaped deviation and a second deviation factor of instant deviation according to the deviation data; the first off tracking factor includes: the outlet temperature and the furnace zone speed of the heating section in the vertical annealing furnace, wherein the second deviation factor comprises: the cooling rate of the heating section in the vertical annealing furnace;
determining a deviation risk factor according to the width of the strip steel and the length of the furnace roller platform
Figure GDA0002168788000000011
Determining the maximum static friction force f of the strip steel according to the density of the strip steel, the friction coefficient between the strip steel and the furnace roller, the gravity acceleration of the strip steel, the taper angle of the furnace roller and the length of the straight section of the furnace roller;
determining the centering force sigma of the strip steel according to the unit tension of the strip steel, the width of the strip steel, the taper angle of the furnace roller, the straight section length of the furnace roller and the wrap angle of the strip steelcenter；
When the deviation risk factor is determined
Figure GDA0002168788000000021
Then, the sigma is judgedcenterWhether f is greater than f;
if the said sigmacenterIf the deviation is smaller than f, determining that the strip steel is snakelike deviation, and adjusting the first deviation factor according to a preset first adjustment standard; if the said sigmacenterAnd if the deviation factor is not less than f, determining that the strip steel is instantaneously deviated, and adjusting the second deviation factor according to a preset second adjusting standard.
In the scheme, the deviation risk factor is determined according to the width of the strip steel and the length of the furnace roller platform
Figure GDA0002168788000000022
The method comprises the following steps:
according to the formula
Figure GDA0002168788000000023
Determining the off tracking risk factor
Figure GDA0002168788000000024
Wherein W is the width of the strip steel, TLhotThe length of the furnace roller platform is defined as α, the width compensation coefficient is defined as α, and the value range is 50-80.
In the above scheme, determining the maximum static friction force f of the strip steel according to the density of the strip steel, the friction coefficient between the strip steel and the furnace roller, the gravity acceleration of the strip steel, the taper angle of the furnace roller and the length of the straight section of the furnace roller includes:
according to the formula f ═ pstripMu g of sin β (W-SL) determines the maximum static friction force f of the strip steel, wherein rhostripThe density of the strip steel is shown, mu is the friction coefficient between the strip steel and the furnace roller, g is the gravity acceleration of the strip steel, W is the width of the strip steel, SL is the straight section length of the furnace roller, and β is the taper angle of the furnace roller.
In the scheme, the centering force sigma of the strip steel is determined according to the unit tension of the strip steel, the width of the strip steel, the taper angle of the furnace roller, the straight section length of the furnace roller and the wrap angle of the strip steelcenterThe method comprises the following steps:
according to the formulaDetermining the centering force sigma of the stripcenter(ii) a Wherein, the sigmastripThe unit tension of the strip steel is shown in the specification, β is the taper angle of the furnace roller, theta is the wrap angle of the strip steel, SL is the length of the straight section of the furnace roller, and W is the width of the strip steel.
In the foregoing solution, the adjusting the first deviation factor according to a preset first adjustment standard includes:
and adjusting the power of each heating area in the vertical annealing furnace to be equal according to a preset first adjustment standard.
In the foregoing solution, the adjusting the second deviation factor according to a preset second adjustment standard includes:
and adjusting the cooling rate of the heating section in the vertical annealing furnace to 2-4.5 ℃/min according to the preset second adjustment standard.
The invention also provides a device for preventing the deviation of the strip steel in the vertical annealing furnace, which comprises:
the device comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring deviation data of the strip steel in a vertical annealing furnace, and determining a first deviation factor of snake-shaped deviation and a second deviation factor of instant deviation according to the deviation data; the first off tracking factor includes: the outlet temperature and the furnace zone speed of the heating section in the vertical annealing furnace, wherein the second deviation factor comprises: the cooling rate of the heating section in the vertical annealing furnace;
a first determining unit for determining deviation risk factor according to the width of the strip steel and the length of the furnace roller platform
Figure GDA0002168788000000031
The second determining unit is used for determining the maximum static friction force f of the strip steel according to the density of the strip steel, the friction coefficient between the strip steel and the furnace roller, the gravity acceleration of the strip steel, the taper angle of the furnace roller and the length of the straight section of the furnace roller platform;
a third determining unit, configured to determine a centering force σ of the strip steel according to the unit tension of the strip steel, the width of the strip steel, the taper angle of the furnace roller, the length of the straight section of the furnace roller, and the wrap angle of the strip steelcenter；
A judging unit for determining the deviation risk factor
Figure GDA0002168788000000032
Then, the sigma is judgedcenterWhether f is greater than f;
a first adjusting unit for adjusting the sigmacenterIf the deviation factor is smaller than f, when the strip steel is determined to be snakelike deviation, adjusting the first deviation factor according to a preset first adjusting standard;
a second adjusting unit for adjusting the sigmacenterIf the deviation is not less than f, determining that the strip steel is instantaneously deviated according to the preset secondAnd adjusting the second deviation factor by the second adjusting standard.
In the foregoing solution, the first determining unit is specifically configured to:
according to the formulaDetermining the off tracking risk factor
Figure GDA0002168788000000042
Wherein W is the width of the strip steel, TLhotThe length of the furnace roller platform is defined as α, the width compensation coefficient is defined as α, and the value range is 50-80.
In the foregoing solution, the second determining unit is specifically configured to:
according to the formula f ═ pstripMu g of sin β (W-SL) determines the maximum static friction force f of the strip steel, wherein rhostripThe density of the strip steel is shown, mu is the friction coefficient between the strip steel and the furnace roller, g is the gravity acceleration of the strip steel, W is the width of the strip steel, SL is the straight section length of the furnace roller, and β is the taper angle of the furnace roller.
In the foregoing solution, the second determining unit is specifically configured to:
according to the formula
Figure GDA0002168788000000043
Determining the centering force sigma of the stripcenter(ii) a Wherein, the sigmastripThe unit tension of the strip steel is shown in the specification, β is the taper angle of the furnace roller, theta is the wrap angle of the strip steel, SL is the length of the straight section of the furnace roller, and W is the width of the strip steel.
The embodiment of the invention provides a method and a device for preventing strip steel from deviating in a vertical annealing furnace, wherein the method comprises the following steps: acquiring deviation data of the strip steel in a vertical annealing furnace, and determining a first deviation factor of snake-shaped deviation and a second deviation factor of instant deviation according to the deviation data; the first off tracking factor includes: vertical annealing furnaceThe outlet temperature and the stove district speed of heating section, the second off tracking factor includes: the cooling rate of the heating section in the vertical annealing furnace; determining a deviation risk factor according to the width of the strip steel and the length of the furnace roller platform
Figure GDA0002168788000000044
Determining the maximum static friction force f of the strip steel according to the density of the strip steel, the friction coefficient between the strip steel and the furnace roller, the gravity acceleration of the strip steel, the taper angle of the furnace roller and the length of the flat section of the furnace roller platform; determining the centering force sigma of the strip steel according to the unit tension of the strip steel, the width of the strip steel, the taper angle of the furnace roller, the straight section length of the furnace roller platform and the wrap angle of the strip steelcenter(ii) a When the deviation risk factor is determinedThen, the sigma is judgedcenterWhether f is greater than f; if the said sigmacenterIf the deviation is smaller than f, determining that the strip steel is snakelike deviation, and adjusting the first deviation factor according to a preset first adjustment standard; if the said sigmacenterIf the deviation factor is not less than f, determining that the strip steel is instantaneously deviated, and adjusting the second deviation factor according to a preset second adjusting standard; so, determine off tracking risk factor, when confirming to have the belted steel off tracking risk according to off tracking risk factor, can adjust the off tracking factor, just so can avoid belted steel off tracking in vertical annealing furnace, avoid the unit to be forced to park, improve production efficiency.
Drawings
FIG. 1 is a schematic flow chart of a method for preventing a strip steel from deviating in a vertical annealing furnace according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a device for preventing strip steel from deviating in a vertical annealing furnace according to a second embodiment of the present invention;
fig. 3 is a schematic comparison diagram before and after the deviation factor is adjusted according to the third embodiment of the present invention.
Detailed Description
In order to solve the technical problems that in the prior art, a unit is forced to stop and the production efficiency is reduced due to the fact that a strip steel deviates in a vertical annealing furnace, the invention provides a method and a device for preventing the strip steel from deviating in the vertical annealing furnace, wherein the method comprises the following steps: acquiring deviation data of the strip steel in a vertical annealing furnace, and determining a first deviation factor of snake-shaped deviation and a second deviation factor of instant deviation according to the deviation data; the first off tracking factor includes: the outlet temperature and the furnace zone speed of the heating section in the vertical annealing furnace, wherein the second deviation factor comprises: the cooling rate of the heating section in the vertical annealing furnace; determining a deviation risk factor according to the width of the strip steel and the length of the furnace roller platformDetermining the maximum static friction force f of the strip steel according to the density of the strip steel, the friction coefficient between the strip steel and the furnace roller, the gravity acceleration of the strip steel, the taper angle of the furnace roller and the length of the flat section of the furnace roller platform; determining the centering force sigma of the strip steel according to the unit tension of the strip steel, the width of the strip steel, the taper angle of the furnace roller, the straight section length of the furnace roller platform and the wrap angle of the strip steelcenter(ii) a When the deviation risk factor is determined
Figure GDA0002168788000000052
Then, the sigma is judgedcenterWhether f is greater than f; if the said sigmacenterIf the deviation is smaller than f, determining that the strip steel is snakelike deviation, and adjusting the first deviation factor according to a preset first adjustment standard; if the said sigmacenterAnd if the deviation factor is not less than f, determining that the strip steel is instantaneously deviated, and adjusting the second deviation factor according to a preset second adjusting standard.
The technical solution of the present invention is further described in detail by the accompanying drawings and the specific embodiments.
Example one
The embodiment provides a method for preventing a strip steel from deviating in a vertical annealing furnace, which comprises the following steps of:
s110, acquiring deviation data of the strip steel in a vertical annealing furnace, and determining a first deviation factor of snake-shaped deviation and a second deviation factor of instant deviation according to the deviation data;
in the step, the deviation of the strip steel at the outlet of the heating section in the vertical annealing furnace can be divided into snake-shaped deviation and instant deviation, so that the deviation can be quantitatively analyzed, the deviation data of the strip steel in the vertical annealing furnace can be obtained, and a first deviation factor of the snake-shaped deviation and a second deviation factor of the instant deviation can be determined according to the deviation data.
Here, the first deviation factor includes: the outlet temperature and the furnace zone speed of the heating section in the vertical annealing furnace, wherein the second deviation factor comprises: the cooling rate of the heating section in the vertical annealing furnace and the width of the strip steel.
S111, determining deviation risk factors according to the width of the strip steel and the length of the furnace roller platform
Figure GDA0002168788000000061
After the first deviation factor and the second deviation factor are determined, in order to quantitatively analyze the deviation process of the strip steel at the outlet heating section of the vertical annealing furnace, the deviation risk factor of the strip steel is determined according to the formula (1)
Figure GDA0002168788000000062
Figure GDA0002168788000000063
In formula (1), W is the width of the strip steel, TLhotThe length of the furnace roller platform is α, the value range of α is 50-80.
When in use
Figure GDA0002168788000000064
When the furnace roller platform is in use, the furnace roller platform is as wide as the strip steel with edges removed, namely the furnace roller corresponding to the strip steel has no positive convexity (or negative convexity) and is positioned atAnd (4) losing the self-correcting capability.
When in use
Figure GDA0002168788000000065
In the process, the width of the furnace roller platform is smaller than the width of the strip steel with the edge removed, namely the furnace roller corresponding to the strip steel has the convexity, and the furnace roller corresponding to the strip steel has the convexity in two conditions:
first, whenWhen the furnace roller corresponding to the strip steel has positive convexity, the furnace roller has certain self-correcting capability;
second, when
Figure GDA0002168788000000071
When the furnace roller corresponding to the strip steel has negative convexity, the self-correcting capability is lost;
wherein x is0The distance between the central line of the furnace roller and the axis of the furnace roller,
Figure GDA0002168788000000072
the average value of the distance from the central point of the furnace roller to the axis of the furnace roller corresponding to the m point. Here, since there are countless points from the center point to the m-point, it is necessary to integrate and average each distance.
When in useAnd when the furnace roller platform is in a width larger than the width of the strip steel with the edge removed, namely the furnace roller corresponding to the strip steel is almost a platform, and the furnace roller loses the self-correcting capability.
Here, the furnace roller includes a straight section and a sloped region, and the furnace roller platform refers to a relatively straight section of the furnace roller along the length of the furnace roller in the hot state of the lehr. The length of the furnace roller platform takes the center of the furnace roller as the central point of the platform; in the length direction of the furnace roller, the maximum difference value of the furnace roller thermal convexity at any two points is not more than 1 μm, namely, any point on a furnace roller platform and the furnace roller central point meet the formula (2):
|xi-xj|≤1μm (2)
in the formula (2), x represents the furnace roller thermal convexity, and i and j represent subscripts of any two points of the furnace roller platform.
When a certain position of the edge of the furnace roller does not satisfy the formula (2), determining that the position is located in the slope area of the furnace roller, taking the subscript of the position as the maximum subscript on the platform of the furnace roller, recording as m, and taking the length of the point m from the center of the furnace roller as L, wherein the length TL of the platform of the furnace roller ishotIt can be derived from equation (3):
TLhot＝2*L (3)
s112, determining the maximum static friction force f of the strip steel according to the density of the strip steel, the friction coefficient between the strip steel and the furnace roller, the gravity acceleration of the strip steel, the taper angle of the furnace roller and the straight section length of the furnace roller;
determining deviation risk factor
Figure GDA0002168788000000074
Then, in order to distinguish the strip steel from snake-shaped deviation or instant deviation, the maximum static friction force f of the strip steel is determined according to a formula (4):
f＝ρstripsinβ(W-SL)μg (4)
in the formula (4), the ρstripThe density of the strip steel is shown, mu is the friction coefficient between the strip steel and the furnace roller, g is the gravity acceleration of the strip steel, W is the width of the strip steel, SL is the straight section length of the furnace roller, and β is the taper angle of the furnace roller.
S113, determining the centering force sigma of the strip steel according to the unit tension of the strip steel, the width of the strip steel, the taper angle of the furnace roller, the length of the straight section of the furnace roller platform and the wrap angle of the strip steelcenter；
After the maximum static friction force f of the strip steel is determined, the step also needs to determine the centering force sigma of the strip steel according to the formula (5)center：
Figure GDA0002168788000000081
In the formula (5), the σstripThe unit tension of the strip steel is shown in the specification, β is the taper angle of the furnace roller, theta is the wrap angle of the strip steel, SL is the length of the straight section of the furnace roller, and W is the width of the strip steel.
S114, when the deviation risk factor is determined
Figure GDA0002168788000000082
Then, the sigma is judgedcenterWhether f is greater than f;
after the parameters are determined, when the strip steel is heated in the vertical furnace roller, the value of the deviation risk factor can be obtained at regular time, and when the deviation risk factor is determined
Figure GDA0002168788000000083
And determining that the furnace roller is in a negative convexity platform state, wherein the strip steel has a deviation risk. Then, in order to determine whether the snake-shaped deviation or the instant deviation exists, the sigma is continuously judgedcenterWhether f is greater than f; if the said sigmacenterIf not less than f, go to step S116; if the said sigmacenterIf the value is less than f, step S115 is executed.
S115, if the strip steel is determined to be in snake-shaped deviation, adjusting the first deviation factor according to a preset first adjusting standard;
in this step, if the sigma iscenterIf the deviation factor is smaller than f, determining that the strip steel is snakelike deviation, and adjusting the first deviation factor according to a preset first adjusting standard.
Specifically, the heating modes of the heating sections are adjusted to a proportional mode according to a preset first adjustment standard, namely the power of each heating zone in the furnace is equal. Here, the number of heating zones is determined according to the size of the vertical annealing furnace.
And S116, determining that the strip steel is instantaneously deviated, and adjusting the second deviation factor according to a preset second adjusting standard.
If the said sigmacenterAnd if the deviation factor is not less than f, determining that the strip steel is instantaneously deviated, and adjusting the second deviation factor according to a preset second adjusting standard.
Specifically, the cooling rate of the heating section in the vertical annealing furnace is adjusted to 2-4.5 ℃/min according to the preset second adjustment standard.
Therefore, the first deviation factor and the second deviation factor are dynamically adjusted through the correlation of the convexity change of the quantitative furnace roller on the deviation factor of the strip steel at the outlet of the heating section, and the deviation of the strip steel at the outlet of the heating section of the vertical annealing furnace is prevented.
Example two
Corresponding to the first embodiment, the embodiment further provides a device for preventing the deviation of the strip steel in the vertical annealing furnace, as shown in fig. 2, the device comprises: an acquisition unit 21, a first determination unit 22, a second determination unit 23, a third determination unit 24, a judgment unit 25, a first adjustment unit 26, and a second adjustment unit 27; wherein the content of the first and second substances,
the deviation of the strip steel at the outlet of the heating section of the vertical annealing furnace can be divided into snake-shaped deviation and instant deviation, and in order to perform quantitative analysis on the deviation, the acquisition unit 21 is used for acquiring deviation data of the strip steel in the vertical annealing furnace and determining a first deviation factor of the snake-shaped deviation and a second deviation factor of the instant deviation according to the deviation data. Here, the first deviation factor includes: the outlet temperature and the furnace zone speed of the heating section in the vertical annealing furnace, wherein the second deviation factor comprises: the cooling rate of the heating section in the vertical annealing furnace and the width of the strip steel.
After the first deviation factor and the second deviation factor are determined, in order to quantitatively analyze the deviation process of the strip steel in the outlet heating section of the vertical annealing furnace, the first determining unit 22 is used for determining the deviation risk factor of the strip steel according to the formula (1)
Figure GDA0002168788000000091
Figure GDA0002168788000000092
In formula (1), W is the width of the strip steel, TLhotThe length of the furnace roller platform is α, the value range of α is 50-80.
When in use
Figure GDA0002168788000000093
And when the furnace roller platform is in the state of losing the self-correcting capability, the furnace roller platform is in the same width with the strip steel with the edge removed, namely the furnace roller corresponding to the strip steel has no positive convexity (or negative convexity).
When in useIn the process, the width of the furnace roller platform is smaller than the width of the strip steel with the edge removed, namely the furnace roller corresponding to the strip steel has the convexity, and the furnace roller corresponding to the strip steel has the convexity in two conditions:
first, when
Figure GDA0002168788000000101
When the furnace roller corresponding to the strip steel has positive convexity, the furnace roller has certain self-correcting capability;
second, when
Figure GDA0002168788000000102
When the furnace roller corresponding to the strip steel has negative convexity, the self-correcting capability is lost;
wherein x is0The distance between the central line of the furnace roller and the axis of the furnace roller,
Figure GDA0002168788000000103
the average value of the distance from the central point of the furnace roller to the axis of the furnace roller corresponding to the m point. Here, since there are countless points from the center point to the m-point, it is necessary to integrate and average each distance.
When in use
Figure GDA0002168788000000104
When the furnace roller is flatThe width of the platform is larger than the width of the strip steel with the edge removed, namely, the furnace rollers corresponding to the strip steel are almost all platforms, and the furnace rollers lose the self-correcting capability.
Here, the furnace roller includes a straight section and a sloped region, and the furnace roller platform refers to a relatively straight section of the furnace roller along the length of the furnace roller in the hot state of the lehr. The length of the furnace roller platform takes the center of the furnace roller as the central point of the platform; in the length direction of the furnace roller, the maximum difference value of the furnace roller thermal convexity at any two points is not more than 1 μm, namely, any point on a furnace roller platform and the furnace roller central point meet the formula (2):
|xi-xj|≤1μm (2)
in the formula (2), x represents the furnace roller thermal convexity, and i and j represent subscripts of any two points of the furnace roller platform.
When a certain position of the edge of the furnace roller does not satisfy the formula (2), determining that the position is located in the slope region of the furnace roller, taking the subscript of the position as the maximum subscript of a certain point on the platform of the furnace roller as m, and taking the length of the point m from the center of the furnace roller as L, wherein the length TL of the platform of the furnace roller ishotIt can be derived from equation (3):
TLhot＝2*L (3)
determining deviation risk factor
Figure GDA0002168788000000105
Then, in order to distinguish whether the strip steel is snakelike off tracking or instantaneous off tracking, the second determining unit 23 further determines the maximum static friction force f of the strip steel according to the formula (4):
f＝ρstripsinβ(W-SL)μg (4)
in the formula (4), the ρstripThe density of the strip steel is shown, mu is the friction coefficient between the strip steel and the furnace roller, g is the gravity acceleration of the strip steel, W is the width of the strip steel, SL is the straight section length of the furnace roller, and β is the taper angle of the furnace roller.
After determining the maximum static friction force f of the strip steel, the third determining unit 24 further determines the centering force σ of the strip steel according to the formula (5)center：
Figure GDA0002168788000000111
In the formula (5), the σstripThe unit tension of the strip steel is shown in the specification, β is the taper angle of the furnace roller, theta is the wrap angle of the strip steel, SL is the length of the straight section of the furnace roller, and W is the width of the strip steel.
After the above parameters are determined, when the strip steel is heated in the vertical furnace roller, the judging unit 25 can regularly obtain the value of the deviation risk factor, and when the deviation risk factor is determined
Figure GDA0002168788000000112
When determining the deviation risk factorAnd determining that the furnace roller is in a negative convexity platform state, wherein the strip steel has a deviation risk. Then, in order to determine whether the snake-shaped deviation or the instant deviation exists, the sigma is continuously judgedcenterWhether or not greater than f.
When sigma iscenterGreater than or equal to f; a second adjusting unit 27 for adjusting the sigmacenterAnd f, when the strip steel is determined to be instantaneously deflected, adjusting the second deflection factor according to a preset second adjusting standard. Specifically, the second adjusting unit 27 adjusts the cooling rate of the heating section in the vertical annealing furnace to 2 ℃/min to 4.5 ℃/min according to the preset second adjusting standard.
When sigma iscenterLess than f; the first adjusting unit 26 is used for adjusting the sigmacenterIf the deviation factor is smaller than f, when the strip steel is determined to be snakelike deviation, adjusting the first deviation factor according to a preset first adjusting standard; specifically, the first adjusting unit 26 adjusts the heating modes of the heating sections to a proportional mode according to a preset first adjusting criterion, i.e. the power of each heating zone in the furnace is equal. Here, the number of heating zones is determined according to the size of the vertical annealing furnaceAnd (4) determining.
EXAMPLE III
In practical application, when the method provided by the first embodiment and the device provided by the second embodiment are applied to a certain unit, the unit is determined to be in snake-shaped deviation, and then the temperature of the outlet area of the heating section of the vertical furnace roller is reduced from 920 ℃ (normal mode) to 900 ℃ (proportional mode), so that the snake-shaped deviation of the strip steel at the outlet of the heating section is successfully avoided, as shown in fig. 3, the heating mode of the front heating section is optimized to be in the normal mode, the periodic action of the deviation rectifying cylinder is used for representing that the strip steel is in the snake-shaped deviation (indicated by the left arrow) at the outlet, the heating mode of the rear heating section is optimized to be in the proportional mode, the non-periodic action of the deviation rectifying cylinder is used for representing that the strip steel is not in the snake-shaped deviation at the.
The method and the device for preventing the deviation of the strip steel in the vertical annealing furnace provided by the embodiment of the invention have the following beneficial effects that:
the embodiment of the invention provides a method and a device for preventing strip steel from deviating in a vertical annealing furnace, wherein the method comprises the following steps: acquiring deviation data of the strip steel in a vertical annealing furnace, and determining a first deviation factor of snake-shaped deviation and a second deviation factor of instant deviation according to the deviation data; the first off tracking factor includes: the outlet temperature and the furnace zone speed of the heating section in the vertical annealing furnace, wherein the second deviation factor comprises: the cooling rate of the heating section in the vertical annealing furnace; determining a deviation risk factor according to the width of the strip steel and the length of the furnace roller platform
Figure GDA0002168788000000121
Determining the maximum static friction force f of the strip steel according to the density of the strip steel, the friction coefficient between the strip steel and the furnace roller, the gravity acceleration of the strip steel, the taper angle of the furnace roller and the length of the flat section of the furnace roller platform; determining the centering force sigma of the strip steel according to the unit tension of the strip steel, the width of the strip steel, the taper angle of the furnace roller, the straight section length of the furnace roller platform and the wrap angle of the strip steelcenter(ii) a When the deviation wind is determinedRisk factor
Figure GDA0002168788000000122
Then, the sigma is judgedcenterWhether f is greater than f; if the said sigmacenterIf the deviation is smaller than f, determining that the strip steel is snakelike deviation, and adjusting the first deviation factor according to a preset first adjustment standard; if the said sigmacenterIf the deviation factor is not less than f, determining that the strip steel is instantaneously deviated, and adjusting the second deviation factor according to a preset second adjusting standard; so, determine off tracking risk factor, when confirming to have the belted steel off tracking risk according to off tracking risk factor, can adjust the off tracking factor, just so can avoid belted steel off tracking in vertical annealing furnace, avoid the unit to be forced to park, improve production efficiency.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents, improvements, etc. that are within the spirit and principle of the present invention should be included in the present invention.

Claims (6)

1. A method for preventing a strip steel from deviating in a vertical annealing furnace is characterized by comprising the following steps:
acquiring deviation data of the strip steel in a vertical annealing furnace, and determining a first deviation factor of snake-shaped deviation and a second deviation factor of instant deviation according to the deviation data; the first off tracking factor includes: the outlet temperature and the furnace zone speed of the heating section in the vertical annealing furnace, wherein the second deviation factor comprises: the cooling rate of the heating section in the vertical annealing furnace;
determining a deviation risk factor according to the width of the strip steel and the length of the furnace roller platform
Figure FDA0002313275590000011
Determining the maximum static friction force f of the strip steel according to the density of the strip steel, the friction coefficient between the strip steel and a furnace roller, the gravity acceleration of the strip steel, the taper angle of the furnace roller and the length of the straight section of the furnace roller;
determining the centering force sigma of the strip steel according to the unit tension of the strip steel, the width of the strip steel, the taper angle of the furnace roller, the straight section length of the furnace roller and the wrap angle of the strip steelcenter；
When the deviation risk factor is determined
Figure FDA0002313275590000012
Then, the sigma is judgedcenterWhether f is greater than f;
if the said sigmacenterIf the deviation is smaller than f, determining that the strip steel is snakelike deviation, and adjusting the first deviation factor according to a preset first adjustment standard; if the said sigmacenterIf the deviation factor is not less than f, determining that the strip steel is instantaneously deviated, and adjusting the second deviation factor according to a preset second adjusting standard; wherein the content of the first and second substances,
determining deviation risk factors according to the width of the strip steel and the length of the furnace roller platformThe method comprises the following steps:
according to the formula
Figure FDA0002313275590000014
Determining the off tracking risk factor
Figure FDA0002313275590000015
Wherein W is the width of the strip steel, TLhotThe length of the furnace roller platform is defined as α, the width compensation coefficient is defined as α, and the value range is 50-80;
adjusting the first deviation factor according to a preset first adjustment standard includes:
adjusting the power of each heating area in the vertical annealing furnace to be equal according to a preset first adjustment standard;
adjusting the second deviation factor according to a preset second adjustment standard comprises:
and adjusting the cooling rate of the heating section in the vertical annealing furnace to 2-4.5 ℃/min according to the preset second adjustment standard.
2. The method of claim 1, wherein determining the maximum static friction force f of the strip steel according to the density of the strip steel, the friction coefficient between the strip steel and the furnace rollers, the gravity acceleration of the strip steel, the taper angle of the furnace rollers and the length of the flat section of the furnace rollers comprises:
according to the formula f ═ pstripMu g of sin β (W-SL) determines the maximum static friction force f of the strip steel, wherein rhostripThe density of the strip steel is shown, mu is the friction coefficient between the strip steel and the furnace roller, g is the gravity acceleration of the strip steel, W is the width of the strip steel, SL is the straight section length of the furnace roller, and β is the taper angle of the furnace roller.
3. The method of claim 1, wherein the centering force σ of the strip is determined based on a unit tension of the strip, a width of the strip, a taper angle of the furnace rolls, a flat section length of the furnace rolls, and a wrap angle of the stripcenterThe method comprises the following steps:
according to the formula
Figure FDA0002313275590000021
Determining the centering force sigma of the stripcenter(ii) a Wherein, the sigmastripThe unit tension of the strip steel is shown in the specification, β is the taper angle of the furnace roller, theta is the wrap angle of the strip steel, SL is the length of the straight section of the furnace roller, and W is the width of the strip steel.
4. A device for preventing a strip steel from deviating in a vertical annealing furnace is characterized by comprising:
the device comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring deviation data of the strip steel in a vertical annealing furnace, and determining a first deviation factor of snake-shaped deviation and a second deviation factor of instant deviation according to the deviation data; the first off tracking factor includes: the outlet temperature and the furnace zone speed of the heating section in the vertical annealing furnace, wherein the second deviation factor comprises: the cooling rate of the heating section in the vertical annealing furnace;
a first determining unit for determining deviation risk factor according to the width of the strip steel and the length of the furnace roller platform
Figure FDA0002313275590000022
The second determining unit is used for determining the maximum static friction force f of the strip steel according to the density of the strip steel, the friction coefficient between the strip steel and the furnace roller, the gravity acceleration of the strip steel, the taper angle of the furnace roller and the straight section length of the furnace roller platform;
a third determining unit, configured to determine a centering force σ of the strip steel according to the unit tension of the strip steel, the width of the strip steel, the taper angle of the furnace roller, the length of the straight section of the furnace roller, and the wrap angle of the strip steelcenter；
A judging unit for determining the deviation risk factor
Figure FDA0002313275590000032
Then, the sigma is judgedcenterWhether f is greater than f;
a first adjusting unit for adjusting the sigmacenterIf the deviation factor is smaller than f, when the strip steel is determined to be snakelike deviation, adjusting the first deviation factor according to a preset first adjusting standard;
a second adjusting unit for adjusting the sigmacenterIf the deviation factor is not less than f, adjusting the second deviation factor according to a preset second adjusting standard when the strip steel is determined to be instantaneously deviated;
the first determining unit is specifically configured to:
according to the formulaDetermining the off tracking risk factor
Figure FDA0002313275590000034
Wherein W is the width of the strip steel, TLhotThe length of the furnace roller platform is defined as α, the width compensation coefficient is defined as α, and the value range is 50-80;
the first adjusting unit is specifically configured to:
adjusting the power of each heating area in the vertical annealing furnace to be equal according to a preset first adjustment standard;
the second adjusting unit is specifically configured to:
and adjusting the cooling rate of the heating section in the vertical annealing furnace to 2-4.5 ℃/min according to the preset second adjustment standard.
5. The apparatus of claim 4, wherein the second determining unit is specifically configured to:
according to the formula f ═ pstripMu g of sin β (W-SL) determines the maximum static friction force f of the strip steel, wherein rhostripThe density of the strip steel is shown, mu is the friction coefficient between the strip steel and the furnace roller, g is the gravity acceleration of the strip steel, W is the width of the strip steel, SL is the straight section length of the furnace roller, and β is the taper angle of the furnace roller.
6. The apparatus of claim 4, wherein the second determining unit is specifically configured to:
according to the formula
Figure FDA0002313275590000031
Determining the centering force sigma of the stripcenter(ii) a Wherein, the sigmastripThe unit tension of the strip steel is shown in the specification, β is the taper angle of the furnace roller, theta is the wrap angle of the strip steel, SL is the length of the straight section of the furnace roller, and W is the width of the strip steel.
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