CN111500848A - Parking tension eliminating method for large-scale strip steel continuous annealing furnace - Google Patents

Parking tension eliminating method for large-scale strip steel continuous annealing furnace Download PDF

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Publication number
CN111500848A
CN111500848A CN202010512986.6A CN202010512986A CN111500848A CN 111500848 A CN111500848 A CN 111500848A CN 202010512986 A CN202010512986 A CN 202010512986A CN 111500848 A CN111500848 A CN 111500848A
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furnace
roller
furnace roller
tension
stopping
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CN111500848B (en
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许秀飞
董斌
雍海泉
德军
程淑明
郭英
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Chongqing CISDI Thermal and Environmental Engineering Co Ltd
CISDI Research and Development Co Ltd
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CISDI Technology Research Center Co Ltd
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Priority to CN202010512986.6A priority Critical patent/CN111500848B/en
Priority to CN202111022890.2A priority patent/CN113621784B/en
Priority to CN202111022893.6A priority patent/CN113699362B/en
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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
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/562—Details
    • C21D9/563—Rolls; Drums; Roll arrangements
    • 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
    • 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
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/562—Details
    • C21D9/564—Tension control

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Abstract

The invention discloses a parking tension eliminating method of a large-scale strip steel continuous annealing furnace, which is characterized in that strip steel in the furnace is in a sagging state by controlling the sequence and the direction of the final stop rotation of furnace rollers, when the temperature of the annealing furnace is recovered to room temperature, the tension of the strip steel is not easy to be caused by cold contraction or the tension degree of the strip steel can be reduced, and the occurrence of strip breakage accidents caused by parking is favorably avoided.

Description

Parking tension eliminating method for large-scale strip steel continuous annealing furnace
Technical Field
The invention relates to the field of steel manufacturing, in particular to a parking tension-eliminating method of a large-scale strip steel continuous annealing furnace.
Background
In the continuous annealing furnace used for the strip steel continuous annealing line and the galvanizing line, strip steel is in a tension state, and after entering the furnace from an inlet, the strip steel continuously passes through furnace towers with various functions and then comes out from an outlet. The temperature of the strip steel in the furnace can reach more than 800 ℃, and the length of the strip steel in the whole furnace can reach one thousand even thousands of meters. After planned shutdown, the furnace temperature and the strip steel temperature can be reduced, the problem of cold shrinkage is caused, the strip steel cold shrinkage benefit with the length is very serious, and great tensile stress can be generated, so that the upper position of the strip steel generates traction deformation due to overlarge stress, even the strip breakage accident can be caused in serious conditions, and great loss is caused.
To prevent this problem, so-called dancer rolls are currently provided at the furnace entrance, which automatically loosen the tightened strip once it is stopped, so that the shrinkage of the strip in the furnace is compensated for to a certain extent. However, because the large-scale continuous strip steel annealing furnace has a lot of rollers and long strip steel, the loose strip steel cannot meet the cold shrinkage of the long strip steel in the furnace at all, and the furnace rollers cannot rotate in a stopped state, so that the frictional resistance of the strip steel on the surface of the furnace rollers is large, and the strip steel in the deep part in the furnace cannot be compensated.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention is directed to a method for stopping and annealing a large-scale continuous strip annealing furnace, so as to avoid the occurrence of strip breakage accidents caused by stopping the furnace.
In order to achieve the above objects and other related objects, the technical solution of the present invention is as follows:
a method for eliminating tension of large-scale continuous strip steel annealing furnace features that the final stop sequence and direction of each roller are controlled to make the strip steel in the furnace in loose state.
Optionally, when the furnace is stopped, the stopping tension-eliminating compensation quantity of each furnace roller is controlled by gradually stopping each furnace roller in sequence from the outlet of the furnace to the inlet of the furnace.
Optionally, the calculation formula of the minimum stopping tension-relief compensation amount of each furnace roller is as follows:
△Lx＝αLx(T1-T2)
wherein, the furnace roller closest to the outlet of the furnace in the furnace is taken as the origin point, and the x represents the position of each furnace roller from the outlet of the furnace to the inlet of the furnace along the track direction of the steel stripThe furnace roller with the arrangement number closest to the outlet in the furnace is the furnace roller with the arrangement number 0, Lx△L shows the track distance of the steel strip between the furnace roller with the arrangement number x and the furnace roller No. 0xThe minimum stopping tension compensation amount of the furnace roller with the arrangement number x is shown, α is the linear thermal expansion coefficient of the steel strip, T1Indicating the temperature T at the time of stopping the annealing furnace2Expressed as room temperature;
the shortest stopping interval time between each furnace roller and the No. 0 furnace roller is as follows:
tx＝2△Lx/(W×D)
wherein, txThe shortest stopping interval time between the furnace roller with the arrangement number x and the furnace roller with the arrangement number 0 is shown, W is the angular velocity of the furnace roller, and D is the diameter of the furnace roller.
Optionally, the parking process includes the following steps:
synchronously stopping the furnace rollers for the first time;
all furnace rollers synchronously run in reverse direction;
stopping the furnace rollers for the second time;
and in the second stopping process of each furnace roller, the furnace rollers gradually stop reverse operation in sequence from the inlet to the outlet of the furnace, and the stopping tension-eliminating compensation quantity of each furnace roller is controlled.
Optionally, the calculation formula of the minimum stopping tension-relief compensation amount of each furnace roller is as follows:
△Ly＝αLy(T1-T2)
wherein the furnace roller closest to the inlet in the furnace is used as the origin, the arrangement number of the furnace rollers in the direction from the inlet in the furnace to the outlet in the furnace is represented by y along the track direction of the steel strip, the furnace roller closest to the inlet in the furnace is the furnace roller No. 0 with the arrangement number of 0, Ly△L shows the distance of the steel strip track between the furnace roller with the arrangement number y and the furnace roller with the arrangement number 0yThe minimum stopping tension compensation amount of the furnace roller with the arrangement number y is shown, α is the linear thermal expansion coefficient of the steel strip, T1Indicating the temperature T at the time of stopping the annealing furnace2Expressed as room temperature;
the shortest stopping interval time between each furnace roller and the No. 0 furnace roller is as follows:
ty＝2△Ly/(W×D)
wherein, tyThe shortest stopping interval time between the furnace roller with the arrangement number y and the furnace roller with the arrangement number 0 is shown, W is the angular velocity of the furnace roller, and D is the diameter of the furnace roller.
Optionally, the parking process includes the following steps:
synchronously stopping the furnace rollers for the first time;
selecting a reference furnace roller, operating each furnace roller again, and when synchronously operating each furnace roller again, operating each furnace roller between the furnace inlet and the reference furnace roller in a forward direction, and operating each furnace roller between the furnace outlet and the reference furnace roller in a reverse direction;
and stopping the furnace rollers for the second time, wherein in the process of stopping the furnace rollers for the second time, the furnace rollers from the inlet of the furnace to the reference furnace roller are gradually stopped, the furnace rollers closer to the reference roller are stopped earlier, the furnace rollers from the outlet of the furnace to the reference furnace roller are gradually stopped, and the furnace rollers closer to the reference roller are stopped earlier, so that the stopping tension-eliminating compensation amount of the furnace rollers is controlled.
Optionally, the calculation formula of the minimum stopping tension-relief compensation amount of each furnace roller is as follows:
△Ln＝αLn(T1-T2)
△Lm＝αLm(T1-T2)
wherein, the reference furnace roller is taken as an original point and is arranged along the track direction of the steel strip, n represents the arrangement serial number of each furnace roller from the reference roller to the inlet direction in the furnace, m represents the arrangement serial number of each furnace roller from the reference roller to the outlet direction in the furnace, one of m and n takes a negative serial number and the other takes a positive serial number, the reference roller is a furnace roller with the 0 arrangement serial number, Ln△L shows the track distance of the steel strip between the furnace roller with the arrangement number n and the reference furnace rollernIndicates the minimum stopping tension compensation amount of the furnace roller with the arrangement number n, Lm△L shows the track distance of the steel strip between the furnace roller with the arrangement number m and the reference furnace rollermThe minimum stopping tension compensation amount of the furnace roller with the arrangement number of m is shown, α shows the line of the steel stripCoefficient of thermal expansion, T1Indicating the temperature T at the time of stopping the annealing furnace2Expressed as room temperature;
the shortest stopping interval time of each furnace roller and the reference roller is as follows:
tn＝2△Ln/(W×D)
tm＝2△Lm/(W×D)
wherein, tnIndicating the shortest stopping interval time t between the furnace roller with the arrangement number n and the reference rollermThe shortest time between stops of the furnace roller reference rollers with the arrangement number m is shown, W is the angular velocity of the furnace roller, and D is the diameter of the furnace roller.
Optionally, the method for stopping and tensioning the large-scale continuous strip steel annealing furnace further comprises the following steps:
arranging an encoder on each furnace roller, and verifying the actual tension relief compensation quantity of each furnace roller according to encoder data;
when the actual parking tension-eliminating compensation amount of each furnace roller is larger than or equal to the corresponding minimum parking tension-eliminating compensation amount, judging that the parking tension-eliminating compensation is finished;
and when the actual stopping tension-relief compensation quantity of any furnace roller is smaller than the corresponding minimum stopping tension-relief compensation quantity, performing secondary tension-relief compensation to correct the actual tension-relief compensation quantity.
Optionally, the secondary relaxation compensation method comprises:
acquiring information of an abnormal furnace roller, wherein the abnormal furnace roller is a furnace roller with the actual parking tension-eliminating compensation amount smaller than the minimum parking tension-eliminating compensation amount;
determining a nearest abnormal furnace roller, wherein the nearest abnormal furnace roller is an abnormal furnace roller which is closest to the track of the No. 0 furnace roller;
calculating the minimum secondary compensation quantity of the nearest abnormal furnace roller, wherein the minimum secondary compensation quantity is equal to the difference value between the minimum parking tension-relief compensation quantity and the actual parking tension-relief compensation quantity;
calculating the shortest secondary compensation time according to the minimum secondary compensation quantity and a preset furnace roller speed;
re-operating all furnace rollers between the nearest abnormal furnace roller and the tail end furnace roller, wherein the re-operating speed of each furnace roller is the preset furnace roller speed, the re-operating direction of each furnace roller is the same as the previous operating direction, the tail end furnace roller is the furnace roller with the farthest distance from the track of the No. 0 furnace roller, and the tail end furnace roller and the nearest abnormal furnace roller are positioned on the same side of the No. 0 furnace roller;
when the starting time is more than or equal to the shortest secondary compensation time, synchronously stopping all the furnace rollers;
and finally, verifying whether an abnormal furnace roller still exists or not, repeating the secondary tension-eliminating compensation method if the abnormal furnace roller still exists, and judging that the shutdown tension-eliminating compensation is finished if the abnormal furnace roller does not exist.
Optionally, if one of the abnormal furnace rollers fails to complete the shutdown tension compensation after performing the secondary tension compensation for the preset number of times, a warning message is sent.
According to the stopping and tension eliminating method of the large-scale continuous strip steel annealing furnace, the strip steel in the furnace is in the sagging state by controlling the sequence and the direction of the final stop rotation of the furnace rollers, when the temperature of the annealing furnace is recovered to the room temperature, the steel strip is not easy to be tensioned due to cold contraction or the tensioning degree of the steel strip can be reduced, and the occurrence of strip breakage accidents caused by stopping is favorably avoided.
Drawings
FIG. 1 is a schematic view showing the position of a No. 0 furnace roller in one embodiment of the parking sheet elimination method of the present invention;
FIG. 2 is a schematic view showing the position of a No. 0 furnace roller in another embodiment of the parking sheet elimination method of the present invention;
fig. 3 is a schematic view showing the position of a No. 0 furnace roller in still another embodiment of the parking sheet elimination method of the present invention.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
According to the parking tension eliminating method of the large-scale strip steel continuous annealing furnace, in the parking process, the strip steel in the furnace is in a sagging state by controlling the final rotation stopping sequence and direction of each furnace roller.
In a large-scale steel strip continuous annealing furnace, the length of a steel strip reaches one kilometer or even more, the parking tension eliminating method of the invention controls the sequence and the direction of the final stop rotation of each furnace roller to ensure that the steel strip in the furnace is in a sagging state, and a certain parking tension eliminating compensation amount can be provided, when the temperature of the annealing furnace is recovered to room temperature, the steel strip is not easy to be tensioned or the tensioning degree of the steel strip can be reduced due to cold shrinkage, thereby being beneficial to reducing the deformation degree or probability of the steel strip and avoiding the occurrence of strip breakage accidents caused by parking.
In order to make the strip steel between any two adjacent furnace rollers in a sagging state, referring to fig. 1, fig. 2 and fig. 3, the following embodiments provide three implementation modes for implementing stopping and relieving.
In one embodiment, referring to fig. 1, in order to make the strip steel between any two adjacent furnace rollers in a sagging state, the furnace rollers are stopped and gradually stopped in the direction from the furnace outlet 200 to the furnace inlet 100, so as to control the stopping tension compensation amount of each furnace roller.
Specifically, in some embodiments, the minimum stopping tension compensation amount of each furnace roller is calculated by the formula:
△Lx＝αLx(T1-T2)
wherein, the furnace roller closest to the furnace outlet 200 in the furnace is taken as the origin, along the track direction of the steel strip, x represents the arrangement number of each furnace roller from the furnace outlet 200 to the furnace inlet 100, and the furnace roller closest to the furnace outlet 200 is the furnace roller A No. 0, L with the arrangement number of 0x△L shows the track distance of the steel strip between the furnace roller with the arrangement number x and the furnace roller A with the arrangement number 0xThe minimum stop tension compensation amount of the furnace rollers with the arrangement number x is shown, α shows the linear thermal expansion coefficient of the steel strip, T1 shows the temperature of the annealing furnace when the annealing furnace is stopped, and T2 shows the room temperature;
the shortest stopping interval time between each furnace roller and the furnace roller A No. 0 is as follows:
tx＝2△Lx/(W×D)
wherein, txIndicates a sequence number ofThe shortest stopping interval time between the furnace roller of x and the furnace roller of No. 0A, W represents the angular velocity of the furnace roller, and D represents the diameter of the furnace roller.
The stopping time of each furnace roller is controlled according to the shortest stopping interval time, so that the stopping tension-relief compensation quantity can be controlled more accurately, the steel belt can hardly be drawn by tension at each position in the stopping process and after the steel belt is restored to the room temperature, the deformation of the steel belt can be avoided more favorably, and the occurrence of belt breakage accidents can be avoided more reliably.
In another embodiment, referring to fig. 2, in order to make the strip steel between any two adjacent furnace rollers in a sagging state, the stopping process comprises the following steps:
synchronously stopping the furnace rollers for the first time;
all furnace rollers synchronously run in reverse direction;
stopping the furnace rollers for the second time;
in the second stopping process of each furnace roller, the furnace rollers gradually stop reverse operation in sequence from the inlet 100 to the outlet 200 in the furnace, and the stopping tension-eliminating compensation quantity of each furnace roller is controlled.
Specifically, in some embodiments, the minimum stopping tension compensation amount of each furnace roller is calculated by the formula:
△Ly＝αLy(T1-T2)
wherein, the furnace roller closest to the furnace inlet 100 in the furnace is taken as the origin, and the arrangement number of the furnace rollers in the direction from the furnace inlet 100 to the furnace outlet 200 is represented by y along the track direction of the steel strip, and the furnace roller closest to the furnace inlet 100 is the furnace roller A No. 0, L with the arrangement number of 0y△L shows the distance of the steel strip track between the furnace roller with the arrangement number y and the furnace roller A with the arrangement number 0yThe minimum stop tension compensation amount of the furnace rollers with the arrangement number y is shown, α shows the linear thermal expansion coefficient of the steel strip, T1 shows the temperature of the annealing furnace when the annealing furnace is stopped, and T2 shows the room temperature;
the shortest stopping interval time between each furnace roller and the furnace roller A No. 0 is as follows:
ty＝2△Ly/(W×D)
wherein, tyIndicates a sequence number ofThe shortest stopping interval time between the furnace roller of y and the furnace roller A of No. 0, W represents the angular velocity of the furnace roller, and D represents the diameter of the furnace roller.
According to the mode of controlling the stalling time of each furnace roller according to the shortest stopping interval time, the stopping tension-relief compensation quantity can be controlled more accurately, so that the steel belt can hardly be drawn by tension at each position in the stopping process and after the steel belt is restored to the room temperature, the deformation of the steel belt can be avoided more favorably, and the belt breakage accident can be avoided more reliably.
In still another embodiment, referring to fig. 3, in order to make the strip between any two adjacent furnace rollers in a sagging state, the stopping process comprises the following steps:
synchronously stopping the furnace rollers for the first time;
selecting a reference furnace roller, operating each furnace roller again, and when operating each furnace roller again synchronously, operating each furnace roller between the furnace inlet 100 and the reference furnace roller in a forward direction, and operating each furnace roller between the furnace outlet 200 and the reference furnace roller in a reverse direction;
and stopping the furnace rollers for the second time, wherein in the process of stopping the furnace rollers for the second time, the furnace rollers from the furnace inlet 100 to the reference furnace rollers are gradually stopped, the furnace rollers closer to the reference rollers are stopped earlier, the furnace rollers from the furnace outlet 200 to the reference furnace rollers are gradually stopped, and the furnace rollers closer to the reference rollers are stopped earlier, so that the stopping tension compensation amount of the furnace rollers is controlled.
Specifically, in some embodiments, the minimum stopping tension compensation amount of each furnace roller is calculated by the formula:
△Ln＝αLn(T1-T2)
△Lm＝αLm(T1-T2)
wherein the reference furnace roller is taken as an original point and is arranged along the track direction of the steel strip, n represents the arrangement serial number of each furnace roller from the reference roller to the inlet 100 in the furnace, m represents the arrangement serial number of each furnace roller from the reference roller to the outlet 200 in the furnace, one of m and n takes a negative serial number and the other takes a positive serial number, the reference roller is a furnace roller A of 0 number with the arrangement serial number of 0, LnShowing a steel strip rail between a furnace roller with an arrangement number n and a reference furnace rollerTrace distance, △LnIndicates the minimum stopping tension compensation amount of the furnace roller with the arrangement number n, Lm△L shows the track distance of the steel strip between the furnace roller with the arrangement number m and the reference furnace rollermThe minimum stop tension compensation amount of the furnace rollers with the arrangement number of m is shown, α shows the linear thermal expansion coefficient of the steel strip, T1 shows the temperature of the annealing furnace when the annealing furnace is stopped, and T2 shows the room temperature;
the shortest stopping interval time of each furnace roller and the reference roller is as follows:
tn＝2△Ln/(W×D)
tm＝2△Lm/(W×D)
wherein tn represents the shortest stopping interval time between the furnace roller with the arrangement number n and the reference roller, and tmThe shortest time between stops of the furnace roller reference rollers with the arrangement number m is shown, W is the angular velocity of the furnace roller, and D is the diameter of the furnace roller.
According to the mode of controlling the stalling time of each furnace roller according to the shortest stopping interval time, the stopping tension-relief compensation quantity can be controlled more accurately, so that the steel belt can hardly be drawn by tension at each position in the stopping process and after the steel belt is restored to the room temperature, the deformation of the steel belt can be avoided more favorably, and the belt breakage accident can be avoided more reliably.
In some embodiments, the method for stopping and tensioning the large strip steel continuous annealing furnace further comprises the following steps:
arranging an encoder on each furnace roller, and verifying the actual tension relief compensation quantity of each furnace roller according to encoder data;
when the actual parking tension-eliminating compensation amount of each furnace roller is larger than or equal to the corresponding minimum parking tension-eliminating compensation amount, judging that the parking tension-eliminating compensation is finished;
and when the actual stopping tension-relief compensation quantity of any furnace roller is smaller than the corresponding minimum stopping tension-relief compensation quantity, performing secondary tension-relief compensation to correct the actual tension-relief compensation quantity.
In the actual implementation process, the current actual angular velocity can be obtained according to the encoder data, and the actual displacement of the steel strip, namely the actual tension compensation amount, can be calculated according to the actual angular velocity and the actual parking interval time, wherein the actual angular velocity can be changed or can be a fixed value. The mode of verifying whether the stopping tension-eliminating compensation is completed or not by utilizing the encoder is favorable for ensuring that the actual amount of elimination of each furnace roller reaches the tension-free approaching condition after the steel strip is cooled, and can further more reliably avoid the short strip accident.
In some embodiments, the second-order relaxation compensation method is as follows:
acquiring information of an abnormal furnace roller, wherein the abnormal furnace roller is a furnace roller with the actual parking tension-eliminating compensation amount smaller than the minimum parking tension-eliminating compensation amount;
determining a nearest abnormal furnace roller, wherein the nearest abnormal furnace roller is an abnormal furnace roller which is closest to the track A of the No. 0 furnace roller;
calculating the minimum secondary compensation quantity of the nearest abnormal furnace roller, wherein the minimum secondary compensation quantity is equal to the difference value between the minimum parking tension-relief compensation quantity and the actual parking tension-relief compensation quantity;
calculating the shortest secondary compensation time according to the minimum secondary compensation quantity and a preset furnace roller speed;
re-operating all furnace rollers between the nearest abnormal furnace roller and the tail end furnace roller, wherein the re-operating speed of each furnace roller is the preset furnace roller speed, the re-operating direction of each furnace roller is the same as the previous operating direction, the tail end furnace roller is the furnace roller with the farthest track distance from the No. 0 furnace roller A, and the tail end furnace roller and the nearest abnormal furnace roller are positioned on the same side of the No. 0 furnace roller A;
when the starting time is more than or equal to the shortest secondary compensation time, synchronously stopping all the furnace rollers;
and finally, verifying whether an abnormal furnace roller still exists or not, repeating the secondary tension-eliminating compensation method if the abnormal furnace roller still exists, and judging that the shutdown tension-eliminating compensation is finished if the abnormal furnace roller does not exist.
In the process of conveying the steel strip by using the furnace rollers, if the furnace roller closer to the No. 0 furnace roller A is abnormal in rotation, the actual tension compensation amount of the furnace roller behind the furnace roller can be influenced, and the secondary tension compensation method is favorable for realizing the compensation of the steel strip between the furnace rollers more accurately and finding the furnace roller which works abnormally.
In some embodiments, if one of the abnormal furnace rollers fails to complete the stop compensation after performing the secondary compensation for a preset number of times, a warning message is sent. In the actual implementation process, if the warning information is received, the staff can be arranged to check and overhaul the site condition of the abnormal furnace roller.
Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims (10)

1. A parking tension eliminating method of a large-scale strip steel continuous annealing furnace is characterized in that: in the stopping process, the strip steel in the furnace is in a sagging state by controlling the final rotation stopping sequence and direction of each furnace roller.
2. The stop-and-expansion method for the large-scale strip steel continuous annealing furnace according to claim 1, characterized in that: when the furnace is stopped, the stopping tension-eliminating compensation quantity of each furnace roller is controlled by gradually stopping each furnace roller in turn from the outlet of the furnace to the inlet of the furnace.
3. The stop-and-expansion method for the large-scale strip steel continuous annealing furnace according to claim 2, characterized in that:
the minimum stopping tension-eliminating compensation quantity calculation formula of each furnace roller is as follows:
△Lx＝αLx(T1-T2)
wherein, the furnace roller closest to the outlet of the furnace inside the furnace is taken as the origin, along the track direction of the steel strip, x represents the arrangement number of each furnace roller from the outlet of the furnace to the inlet of the furnace, the furnace roller closest to the outlet of the furnace is the furnace roller with 0 arrangement number, LxFurnace roller with arrangement number x and furnace No. 0Distance of steel strip path between rolls, △LxThe minimum stopping tension compensation amount of the furnace roller with the arrangement number x is shown, α is the linear thermal expansion coefficient of the steel strip, T1Indicating the temperature T at the time of stopping the annealing furnace2Expressed as room temperature;
the shortest stopping interval time between each furnace roller and the No. 0 furnace roller is as follows:
tx＝2△Lx/(W×D)
wherein, txThe shortest stopping interval time between the furnace roller with the arrangement number x and the furnace roller with the arrangement number 0 is shown, W is the angular velocity of the furnace roller, and D is the diameter of the furnace roller.
4. The stop-and-expansion method for the large-scale strip steel continuous annealing furnace according to claim 1, characterized in that: the parking process comprises the following steps:
synchronously stopping the furnace rollers for the first time;
all furnace rollers synchronously run in reverse direction;
stopping the furnace rollers for the second time;
and in the second stopping process of each furnace roller, the furnace rollers gradually stop reverse operation in sequence from the inlet to the outlet of the furnace, and the stopping tension-eliminating compensation quantity of each furnace roller is controlled.
5. The stop-and-expansion method for a large vertical steel strip continuous annealing furnace according to claim 4, characterized in that:
the minimum stopping tension-eliminating compensation quantity calculation formula of each furnace roller is as follows:
△Ly＝αLy(T1-T2)
wherein the furnace roller closest to the inlet in the furnace is used as the origin, the arrangement number of the furnace rollers in the direction from the inlet in the furnace to the outlet in the furnace is represented by y along the track direction of the steel strip, the furnace roller closest to the inlet in the furnace is the furnace roller No. 0 with the arrangement number of 0, Ly△L shows the distance of the steel strip track between the furnace roller with the arrangement number y and the furnace roller with the arrangement number 0yThe minimum stopping tension compensation amount of the furnace rollers with the arrangement number y is shown, α is the linear thermal expansion of the steel stripCoefficient, T1Indicating the temperature T at the time of stopping the annealing furnace2Expressed as room temperature;
the shortest stopping interval time between each furnace roller and the No. 0 furnace roller is as follows:
ty＝2△Ly/(W×D)
wherein, tyThe shortest stopping interval time between the furnace roller with the arrangement number y and the furnace roller with the arrangement number 0 is shown, W is the angular velocity of the furnace roller, and D is the diameter of the furnace roller.
6. The stop-and-expansion method for the large-scale strip steel continuous annealing furnace according to claim 1, characterized in that: the parking process comprises the following steps:
synchronously stopping the furnace rollers for the first time;
selecting a reference furnace roller, operating each furnace roller again, and when synchronously operating each furnace roller again, operating each furnace roller between the furnace inlet and the reference furnace roller in a forward direction, and operating each furnace roller between the furnace outlet and the reference furnace roller in a reverse direction;
and stopping the furnace rollers for the second time, wherein in the process of stopping the furnace rollers for the second time, the furnace rollers from the inlet of the furnace to the reference furnace roller are gradually stopped, the furnace rollers closer to the reference roller are stopped earlier, the furnace rollers from the outlet of the furnace to the reference furnace roller are gradually stopped, and the furnace rollers closer to the reference roller are stopped earlier, so that the stopping tension-eliminating compensation amount of the furnace rollers is controlled.
7. The stop-and-expansion method for a large vertical steel strip continuous annealing furnace according to claim 6, characterized in that:
the minimum stopping tension-eliminating compensation quantity calculation formula of each furnace roller is as follows:
△Ln＝αLn(T1-T2)
△Lm＝αLm(T1-T2)
wherein, the reference furnace roller is taken as an original point and is along the track direction of the steel strip, n represents the arrangement serial number of each furnace roller from the reference roller to the inlet direction in the furnace, m represents the arrangement serial number of each furnace roller from the reference roller to the outlet direction in the furnace, m andone of n takes a negative serial number, the other takes a positive serial number, the reference roller is a No. 0 furnace roller with the arrangement serial number of 0, Ln△L shows the track distance of the steel strip between the furnace roller with the arrangement number n and the reference furnace rollernIndicates the minimum stopping tension compensation amount of the furnace roller with the arrangement number n, Lm△L shows the track distance of the steel strip between the furnace roller with the arrangement number m and the reference furnace rollermThe minimum stopping tension compensation amount of the furnace roller with the arrangement number of m is shown, α is the linear thermal expansion coefficient of the steel strip, T1Indicating the temperature T at the time of stopping the annealing furnace2Expressed as room temperature;
the shortest stopping interval time of each furnace roller and the reference roller is as follows:
tn＝2△Ln/(W×D)
tm＝2△Lm/(W×D)
wherein, tnIndicating the shortest stopping interval time t between the furnace roller with the arrangement number n and the reference rollermThe shortest time between stops of the furnace roller reference rollers with the arrangement number m is shown, W is the angular velocity of the furnace roller, and D is the diameter of the furnace roller.
8. The stop-and-tension canceling method for the large strip steel continuous annealing furnace according to claim 3, 5 or 7, further comprising:
arranging an encoder on each furnace roller, and verifying the actual tension relief compensation quantity of each furnace roller according to encoder data;
when the actual parking tension-eliminating compensation amount of each furnace roller is larger than or equal to the corresponding minimum parking tension-eliminating compensation amount, judging that the parking tension-eliminating compensation is finished;
and when the actual stopping tension-relief compensation quantity of any furnace roller is smaller than the corresponding minimum stopping tension-relief compensation quantity, performing secondary tension-relief compensation to correct the actual tension-relief compensation quantity.
9. The stop-and-tension canceling method for the large vertical steel strip continuous annealing furnace according to claim 8, wherein the secondary tension canceling method comprises:
acquiring information of an abnormal furnace roller, wherein the abnormal furnace roller is a furnace roller with the actual parking tension-eliminating compensation amount smaller than the minimum parking tension-eliminating compensation amount;
determining a nearest abnormal furnace roller, wherein the nearest abnormal furnace roller is an abnormal furnace roller which is closest to the track of the No. 0 furnace roller;
calculating the minimum secondary compensation quantity of the nearest abnormal furnace roller, wherein the minimum secondary compensation quantity is equal to the difference value between the minimum parking tension-relief compensation quantity and the actual parking tension-relief compensation quantity;
calculating the shortest secondary compensation time according to the minimum secondary compensation quantity and a preset furnace roller speed;
re-operating all furnace rollers between the nearest abnormal furnace roller and the tail end furnace roller, wherein the re-operating speed of each furnace roller is the preset furnace roller speed, the re-operating direction of each furnace roller is the same as the previous operating direction, the tail end furnace roller is the furnace roller with the farthest distance from the track of the No. 0 furnace roller, and the tail end furnace roller and the nearest abnormal furnace roller are positioned on the same side of the No. 0 furnace roller;
when the starting time is more than or equal to the shortest secondary compensation time, synchronously stopping all the furnace rollers;
and finally, verifying whether an abnormal furnace roller still exists or not, repeating the secondary tension-eliminating compensation method if the abnormal furnace roller still exists, and judging that the shutdown tension-eliminating compensation is finished if the abnormal furnace roller does not exist.
10. The stop-and-expansion method for a large vertical steel strip continuous annealing furnace according to claim 9, characterized in that: and if one abnormal furnace roller cannot complete the stopping and tension-relief compensation after the secondary tension-relief compensation is carried out for the preset times, sending warning information.
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