CN111360077B - Control method for preventing strip steel from throwing into acid tank - Google Patents
Control method for preventing strip steel from throwing into acid tank Download PDFInfo
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- CN111360077B CN111360077B CN202010139977.7A CN202010139977A CN111360077B CN 111360077 B CN111360077 B CN 111360077B CN 202010139977 A CN202010139977 A CN 202010139977A CN 111360077 B CN111360077 B CN 111360077B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2201/00—Special rolling modes
- B21B2201/06—Thermomechanical rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2275/00—Mill drive parameters
- B21B2275/02—Speed
- B21B2275/04—Roll speed
Abstract
The invention discloses a control method for preventing strip steel from throwing into an acid tank, which comprises the following steps: obtaining operation parameters corresponding to hot rolled strip steel passing through a withdrawal and straightening machine; determining whether the hot rolled strip steel has strip breakage or not based on the operation parameters; work as hot rolling strip steel exists when taking absolutely, control hot rolling production line and parks to the first compression roller of control first tension roll top, the second compression roller of second tension roll top and the third compression roller of third tension roll top are pushed down, first tension roll is located draw the entry side of straightening the machine, the second tension roll is located draw the outlet side of straightening the machine, the third tension roll sets up the outlet side at the descaling bath, the descaling bath is located along hot rolling strip steel's traffic direction draw behind the straightening the machine. The control method has the advantages that the broken strip steel is timely embraced when the broken strip is found, so that the broken strip steel is not thrown into the pickling tank, and the technical problems that the accident department is complex, the pickling rolling capacity is influenced and potential safety hazards exist after the accident that the broken strip steel is thrown into the pickling tank are avoided.
Description
Technical Field
The invention relates to the technical field of cold rolling, in particular to a control method for preventing strip steel from throwing into an acid tank.
Background
The withdrawal and straightening is a very important process in the cold rolling process, and the purpose is mainly two aspects: firstly, improving the shape of a plate; secondly, the iron oxide scale on the surface of the strip steel after being pulled and corrected can be cracked so as to be convenient for pickling. After the hot-rolled strip steel is straightened by the straightening machine, the strip steel enters a three-section turbulent flow pickling tank, iron oxide scales on the surface of the strip steel are cleaned by acid chemical reaction, then the strip steel enters a five-tandem mill for rolling through procedures of rinsing, edge cutting and the like, and then a cold-hard substrate is formed through coiling.
As shown in figure 1, because the thickness of the raw material is thin and the head part and the tail part are easy to have folding or twill defects, after passing through a withdrawal and straightening unit, triggering the withdrawal and straightening unit to break the strip; when the quality of the welding seam is poor, the strip can be broken after being pulled and corrected. After the tension leveler breaks the strip, the strip steel is easy to drop into an acid tank at the moment of tension loss. Before handling accidents, firstly, the acid tank is flushed for 30 minutes, the tank cover can be opened at the left rear part and the right rear part, after the tank cover is opened, the hose is used for receiving water and continuously flushing for more than 30 minutes, and then the belt breakage accidents are handled, so that the influence of acid on operators is reduced as much as possible. When broken belts are treated, the belt tails need to be connected by leading belts, the third tension roller is inching to reverse and feed the sleeve, and after a certain sleeve amount is obtained, the second tension roller is inching to pull the sleeve backwards and reciprocate, so that the belt tails are straightened at the inlet of the acid tank; then, reversely passing through a second tension roller along the running direction of the strip steel by using a leading strip to be connected with a strip head, and then pointing the strip head to the strip tail of the acid tank inlet platform by clicking the first tension roller and the second tension roller; and finally, manually welding the belt head and the belt tail.
Therefore, the whole process for processing the accident of strip steel breakage is quite complicated, and the accident processing time is more than 5 hours, so that the acid rolling capacity is influenced; on the other hand, the operator has more potential safety hazards when handling broken belts.
Disclosure of Invention
The embodiment of the application provides a control method for preventing strip steel from being thrown into an acid tank, and solves the technical problems that in the prior art, the process for processing the strip steel breakage accident is complicated, the acid rolling capacity is influenced, and potential safety hazards exist.
The application provides the following technical scheme through an embodiment of the application:
a control method for preventing strip steel from throwing into an acid tank comprises the following steps: obtaining operation parameters corresponding to hot rolled strip steel passing through a withdrawal and straightening machine; determining whether the hot rolled strip steel has strip breakage or not based on the operation parameters; work as hot rolling belted steel exists when taking absolutely, control hot rolling production line parks to the first compression roller of control first tension roll top, the second compression roller of second tension roll top and the third compression roller of third tension roll top are pushed down, first tension roll is located draw the entrance side of straightening machine, the second tension roll is located draw the exit side of straightening machine, the third tension roll sets up the exit side at the descaling bath, the descaling bath is located along the traffic direction of hot rolling belted steel draw behind the straightening machine.
In one embodiment, the obtaining the operation parameters of the hot rolled strip steel passing through the withdrawal and straightening unit comprises the following steps: acquiring a first speed of the first tension roller and a second speed of the second tension roller; the determining whether the hot rolled strip steel has strip breakage based on the operation parameters comprises the following steps: obtaining a first speed difference between the first tension roll and the second tension roll, an elongation of the hot-rolled strip steel and a second speed difference between the second tension roll and the first tension roll based on the first speed and the second speed; determining whether the hot-rolled strip steel has broken strip or not based on the first speed difference, the elongation and the second speed difference; and when any one of the conditions that the first speed difference is greater than a first speed difference threshold value, the elongation is greater than an elongation threshold value and the second speed difference is greater than a second speed difference threshold value is met, determining that the hot-rolled strip steel has strip breakage.
In one embodiment, the first speed difference threshold is 14-16 mpm, the elongation threshold is 4.5% -5%, and the second speed difference threshold is 14-16 mpm.
In one embodiment, the determining that the hot-rolled strip steel has a strip breakage when any one of the first speed difference is greater than a first speed difference threshold, the elongation is greater than an elongation threshold, and the second speed difference is greater than a second speed difference threshold specifically includes: and when any one of the conditions that the first speed difference is continuously greater than the first speed difference threshold value in a first time, the elongation rate is continuously greater than the elongation rate threshold value in a second time, and the second speed difference is continuously greater than the second speed difference threshold value in a third time is satisfied, determining that the strip breakage exists in the hot-rolled strip steel.
In one embodiment, the acquiring the operation parameters of the hot rolled strip passing through the withdrawal and straightening unit comprises: acquiring a first speed of the first tension roller, a second speed of the second tension roller and a third speed of the third tension roller; the determining whether the hot rolled strip steel has a strip breakage based on the operation parameters comprises: obtaining a first speed difference between the first tension roller and the second tension roller, an elongation of the hot-rolled strip steel and a third speed difference between the second tension roller and the third tension roller on the basis of the first speed, the second speed and the third speed; determining whether the hot-rolled strip steel has broken strip or not based on the first speed difference, the elongation and the third speed difference; when any one of the conditions that the first speed difference is larger than a first speed difference threshold value, the elongation rate is larger than an elongation rate threshold value and the third speed difference is larger than a third speed difference threshold value is met, the fact that the strip breakage exists in the hot-rolled strip steel is determined.
In one embodiment, the first speed difference threshold is 14-16 mpm, the elongation threshold is 4.5% -5%, and the third speed difference threshold is 9-11 mpm.
In one embodiment, when any one of the conditions that the first speed difference is greater than a first speed difference threshold, the elongation rate is greater than an elongation rate threshold, and the third speed difference is greater than a third speed difference threshold is satisfied, determining that the hot-rolled strip steel has a strip break specifically includes: and when any one of the conditions that the first speed difference is continuously greater than the first speed difference threshold value in the first time, the elongation rate is continuously greater than the elongation rate threshold value in the second time, and the third speed difference is continuously greater than the third speed difference threshold value in the third time is met, determining that the strip breakage exists in the hot-rolled strip steel.
In one embodiment, the first time is less than 2s-2.5s, the second time is less than 0.9s-1.2s, and the third time is less than 6.5s-7 s.
In one embodiment, further comprising: when the first part of the hot-rolled strip steel passes through the withdrawal and straightening unit, the running speed of the hot-rolled strip steel is controlled to be a first preset speed, and the distance between the first part and the head position or the tail position is within a preset length range.
In one embodiment, the preset length range is 0-30m, and the first preset speed is 50-70 mpm.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
the method comprises the steps of obtaining corresponding operating parameters of hot rolled strip steel passing through a withdrawal and straightening machine; determining whether the hot rolled strip steel has strip breakage or not based on the operation parameters; when the strip breakage of the hot-rolled strip steel exists, the hot-rolling production line is controlled to stop in time, the tension roller behind the strip breakage position is prevented from continuously dragging the strip steel, the strip steel is pulled into a pickling tank, and meanwhile three-level protection measures are established, namely the first pressing roller pressing-down on the first tension roller, the second pressing roller pressing-down on the second tension roller and the third pressing roller pressing-down on the third tension roller. When the hot rolled strip steel is broken, the compression roller above the third-level tension roller is controlled to be pressed down in time so as to hold the broken strip steel, and the pickling tank is prevented from being thrown due to inertia after the strip steel is broken. It is thus clear that this application is in time embracing the broken tape strip steel when discovering that the area is broken, makes its control method who is not got rid of into the descaling bath, has avoided the accident that the broken tape strip steel got rid of into the descaling bath to take place the back, and the accident department is loaded down with trivial details, influences the acid-rolling productivity and has the technical problem of potential safety hazard.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a layout of tension rolls for a tension straightening process section and a pickling process section in a convergence of the present application and the prior art;
fig. 2 is a flowchart of a control method for preventing strip steel from being thrown into an acid tank according to an embodiment of the present application.
Detailed Description
The embodiment of the application provides a control method for preventing strip steel from being thrown into an acid tank, and solves the technical problems that in the prior art, the process for processing the strip steel breakage accident is complicated, the acid rolling capacity is influenced, and potential safety hazards exist.
In order to solve the technical problems, the general idea of the embodiment of the application is as follows:
a control method for preventing strip steel from throwing into an acid tank comprises the following steps: obtaining operation parameters corresponding to hot rolled strip steel passing through a withdrawal and straightening machine; determining whether the hot rolled strip steel has strip breakage or not based on the operation parameters; work as hot rolling belted steel exists when taking absolutely, control hot rolling production line parks to the first compression roller of control first tension roll top, the second compression roller of second tension roll top and the third compression roller of third tension roll top are pushed down, first tension roll is located draw the entrance side of straightening machine, the second tension roll is located draw the exit side of straightening machine, the third tension roll sets up the exit side at the descaling bath, the descaling bath is located along the traffic direction of hot rolling belted steel draw behind the straightening machine.
The control method has the advantages that the broken strip steel is timely embraced when the broken strip is found, so that the broken strip steel is not thrown into the pickling tank, and the technical problems that the accident department is complex, the pickling rolling capacity is influenced and potential safety hazards exist after the accident that the broken strip steel is thrown into the pickling tank are avoided.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
Example one
As shown in fig. 1 and 2, in this embodiment, a first tension roll and a second tension roll are respectively disposed on an inlet side and an outlet side of a withdrawal and straightening machine, a pickling tank, a rinsing tank and a dryer are sequentially disposed behind the second tension roll on the outlet side of the withdrawal and straightening machine, a third tension roll is disposed behind the dryer, and the first tension roll, the second tension roll and the third tension roll are responsible for the tension building and operation of a hot-rolled strip steel, and this embodiment provides a control method for preventing the strip steel from being thrown into the pickling tank, including:
step S101: obtaining operation parameters corresponding to hot rolled strip steel passing through a withdrawal and straightening machine;
step S102: determining whether the hot rolled strip steel has strip breakage or not based on the operation parameters;
step S103: work as hot rolling belted steel exists when taking absolutely, control hot rolling production line parks to the first compression roller of control first tension roll top, the second compression roller of second tension roll top and the third compression roller of third tension roll top are pushed down, first tension roll is located draw the entrance side of straightening machine, the second tension roll is located draw the exit side of straightening machine, the third tension roll sets up the exit side at the descaling bath, the descaling bath is located along the traffic direction of hot rolling belted steel draw behind the straightening machine.
In practical application, when a hot rolling production line stops, all tension rollers on the hot rolling production line stop dragging hot rolled strip steel, including a first tension roller, a second tension roller and a third tension roller, if the hot rolled strip steel is broken at the first tension roller, the second tension roller and the third tension roller stop timely, so that the broken hot rolled strip steel can be prevented from being continuously dragged backwards; if the broken hot-rolled strip steel occurs between the first tension roller and the second tension roller, the second tension roller and the third tension roller are stopped in time, so that the broken hot-rolled strip steel can be prevented from being continuously dragged backwards; if the hot-rolled strip steel is broken at the second tension roller, the third tension roller is stopped in time, and the situation that the broken hot-rolled strip steel is continuously dragged backwards can be avoided. Simultaneously, this embodiment has still provided tertiary safeguard procedures, promptly: the first pressing roller above the first tension roller presses down, the second pressing roller above the second tension roller presses down, and the third pressing roller above the third tension roller presses down. No matter where the broken strip position occurs, in the three-level protection measures provided by the embodiment, at least the third press roll above the third tension roll presses down to timely press the broken hot rolled strip steel, so that the protection performance is high.
As an alternative embodiment, step S101 includes:
acquiring a first speed of the first tension roller and a second speed of the second tension roller;
step S102, comprising:
obtaining a first speed difference between the first tension roll and the second tension roll, an elongation of the hot-rolled strip steel and a second speed difference between the second tension roll and the first tension roll based on the first speed and the second speed;
determining whether the hot-rolled strip steel has broken strip or not based on the first speed difference, the elongation and the second speed difference; when any one of the conditions that the first speed difference is larger than a first speed difference threshold value, the elongation is larger than an elongation threshold value and the second speed difference is larger than a second speed difference threshold value is met, the fact that the strip breakage exists in the hot-rolled strip steel is determined.
It should be noted that, in the long-term practice, the applicant found that, when the hot rolled strip between two tension rolls is broken, the tension roll near the broken position of the hot rolled strip will suddenly lose tension, the speed will rapidly increase, and the climbing of the speed of the tension roll far from the broken position of the hot rolled strip will lag, so that when the strip is broken, the tension rolls at the two ends of the broken position of the hot rolled strip will generate a large speed difference, thereby determining whether the hot rolled strip is broken and the broken position. Specifically, if the strip breakage position occurs on the inlet side of the withdrawal and straightening unit and includes a position at the first tension roll, between the first tension roll and the second tension roll and close to the first tension roll, the speed of the first tension roll will increase sharply, and a large speed difference will exist between the first speed and the second speed, so that when the first speed difference between the first speed and the second speed is greater than the first speed difference threshold value, it is determined that the strip breakage exists in the hot-rolled strip steel. If the strip breakage position occurs on the outlet side of the withdrawal and straightening unit and comprises the position of the second tension roller, the position between the first tension roller and the second tension roller and the position close to the second tension roller, the speed of the second tension roller will sharply rise, and a large speed difference will exist between the second speed and the first speed, namely when the second speed difference between the second speed and the first speed is larger than a second speed difference threshold value, the strip breakage of the hot-rolled strip steel is determined.
Meanwhile, the elongation of the hot-rolled strip steel is generally controlled to be about 2 percent in the rolling process, and the maximum elongation does not exceed 4.5 percent. The elongation is set too large, so that the hot-rolled strip steel is broken due to the tensile fracture. Therefore, if the elongation of the hot-rolled strip is found to be greater than the elongation threshold value during the withdrawal and straightening, the hot-rolled strip is broken. The elongation is the percentage of the ratio of the total deformation delta L of the gauge length section after the sample is stretched to the original gauge length L: δ ═ Δ L/lx 100%. Since Δ L is difficult to measure and is realized by Δ v, in the present invention, δ is calculated by δ being Δ v/v × 100%, where Δ v is a change in speed before and after rolling, and in the present embodiment, corresponds to a speed difference between the second speed and the first speed, and v is a speed before rolling, and in the present embodiment, corresponds to the first speed. The elongation is only suitable for judging the condition that the strip breakage of the hot rolled strip steel occurs between the first tension roller and the second tension roller.
Optionally, when the elongation of the hot rolled strip is greater than the elongation threshold, determining whether the first speed of the first tension roll is greater than 12mpm, and if so, determining that the hot rolled strip is broken. Since the calculated elongation δ is calculated by the formula δ Δ v/v × 100%, if the first speed v is too small, there is a high possibility that the elongation δ is greater than the elongation threshold, and therefore, to avoid erroneous judgment, it is preferable to determine the breakage of the hot rolled strip only when the first speed of the first tension roll is greater than 12mpm and the elongation of the hot rolled strip is greater than the elongation threshold.
Further, the first tension roller includes: 1# roller and 2# roller; the second tension roller includes: 1# roller, 2# roller and 3# roller; the first speed of the first tension roller is the roller speed of the 1# roller or the 2# roller of the first tension roller; the second speed of the second tension roller is the roller speed of the No. 1 roller or the No. 2 roller of the second tension roller;
as an alternative embodiment, the first speed difference threshold is 14-16 mpm, the elongation threshold is 4.5% -5%, and the second speed difference threshold is 14-16 mpm.
The first speed difference threshold may be 14mpm, 15mpm, 16 mpm; the elongation threshold may be 4.5%, 4.7%, 5%; the second speed difference threshold may be 14.5mpm, 15mpm, 15.5 mpm.
Preferably, the first speed difference threshold is 15 mpm; the elongation threshold may be 5%; the second speed difference threshold may be 15 mpm.
As an optional embodiment, when any one of the first speed difference being greater than a first speed difference threshold, the elongation being greater than an elongation threshold, and the second speed difference being greater than a second speed difference threshold is satisfied, determining that there is a strip breakage in the hot-rolled strip steel specifically includes:
and when any one of the conditions that the first speed difference is continuously greater than the first speed difference threshold value in a first time, the elongation rate is continuously greater than the elongation rate threshold value in a second time, and the second speed difference is continuously greater than the second speed difference threshold value in a third time is met, determining that the strip breakage exists in the hot-rolled strip steel.
In practical use, the instantaneous fluctuation of the speed may cause an instantaneous sharp rise or drop of the speed, and therefore, the hot-rolled steel strip may not be substantially broken, but the first speed difference is greater than the first speed difference threshold, the elongation is greater than the elongation threshold, and the second speed difference is greater than the second speed difference threshold. Therefore, in order to avoid the production line stopping caused by the misjudgment, the embodiment continuously judges whether the first speed difference is greater than the first speed difference threshold value in the first time, continuously judges whether the elongation rate is greater than the elongation rate threshold value in the second time, and continuously judges whether the second speed difference is greater than the second speed difference threshold value in the third time.
As an alternative embodiment, step S101 includes:
acquiring a first speed of the first tension roller, a second speed of the second tension roller and a third speed of the third tension roller;
step S102, comprising:
obtaining a first speed difference between the first tension roller and the second tension roller, an elongation of the hot-rolled strip steel and a third speed difference between the second tension roller and the third tension roller based on the first speed, the second speed and the third speed;
determining whether the hot-rolled strip steel has strip breakage or not based on the first speed difference, the elongation and the third speed difference; and when any one of the conditions that the first speed difference is greater than a first speed difference threshold value, the elongation is greater than an elongation threshold value and the third speed difference is greater than a third speed difference threshold value is met, determining that the hot-rolled strip steel has broken strips.
It should be noted that, in the long-term practice, the applicant found that, when the hot rolled strip between two tension rolls is broken, the tension roll near the broken position of the hot rolled strip will suddenly lose tension, the speed will rapidly increase, and the climbing of the speed of the tension roll far from the broken position of the hot rolled strip will lag, so that when the strip is broken, the tension rolls at the two ends of the broken position of the hot rolled strip will generate a large speed difference, thereby determining whether the hot rolled strip is broken and the broken position.
Specifically, if the strip breakage position occurs at the second tension roller, the speed of the second tension roller will sharply rise, and a large speed difference will exist between the second speed and the third speed, so that the strip breakage of the hot-rolled strip steel is determined when the third speed difference between the second speed and the third speed is greater than the third speed difference threshold value.
If the strip breakage position occurs on the inlet side of the withdrawal and straightening unit and comprises a position at the first tension roller, between the first tension roller and the second tension roller and close to the first tension roller, the speed of the first tension roller will sharply rise, and a large speed difference will exist between the first speed and the second speed, so that when the first speed difference between the first speed and the second speed is greater than a first speed difference threshold value, the strip breakage of the hot-rolled strip steel is determined.
If the belt breaking position occurs between the first tension roller and the second tension roller, the method comprises the following steps: the elongation of the hot rolled strip is greater than the elongation threshold value, and thus, it is determined that the hot rolled strip has a breakage when the elongation is greater than the elongation threshold value.
Further, the first tension roller includes: 1# roller and 2# roller; the second tension roller includes: 1# roller, 2# roller and 3# roller; the third tension roller includes: 1# roller and 2# roller; the first speed of the first tension roller is the roller speed of the 1# roller or the 2# roller of the first tension roller; the second speed of the second tension roller is the roller speed of the 1# roller or the 2# roller of the second tension roller; the third speed of the third tension roller is the roller speed of the 1# roller, the 2# roller or the 3# roller of the third tension roller.
As an alternative embodiment, the first speed difference threshold is 14-16 mpm, the elongation threshold is 4.5% -5%, and the third speed difference threshold is 9-11 mpm.
The first speed difference threshold may be 14mpm, 15mpm, 16 mpm; the elongation threshold may be 4.5%, 4.7%, 5%; the third velocity difference threshold may be 9mpm, 10mpm, 11 mpm.
Preferably, the first speed difference threshold is 15 mpm; the elongation threshold may be 5%; the third speed difference threshold may be 10 mpm.
As an optional embodiment, when any one of the conditions that the first speed difference is greater than a first speed difference threshold, the elongation rate is greater than an elongation rate threshold, and the third speed difference is greater than a third speed difference threshold is satisfied, determining that there is a strip break in the hot-rolled strip steel specifically includes:
and when any one of the conditions that the first speed difference is continuously greater than the first speed difference threshold value in a first time, the elongation rate is continuously greater than the elongation rate threshold value in a second time, and the third speed difference is continuously greater than the third speed difference threshold value in a third time is satisfied, determining that the hot-rolled strip steel has broken strips.
In practical applications, the instantaneous fluctuation of the speed may cause an instantaneous sharp rise or drop in the speed, and therefore, the hot-rolled strip may not substantially break, but the first speed difference is greater than the first speed difference threshold, the elongation is greater than the elongation threshold, and the third speed difference is greater than the third speed difference threshold. Therefore, in order to avoid the production line stop caused by the misjudgment, the present embodiment continuously judges whether the first speed difference is greater than the first speed difference threshold value in the first time, continuously judges whether the elongation rate is greater than the elongation rate threshold value in the second time, and continuously judges whether the third speed difference is greater than the third speed difference threshold value in the third time.
As an alternative embodiment, the first time is less than 2s to 2.5s, the second time is less than 0.9s to 1.2s, and the third time is less than 6.5s to 7 s.
In practical application, the maximum running speed of the hot-rolled strip steel is 200mpm, the distance between the first tension roll and the second tension roll is 8m, the distance between the outlet of the tension leveler and the second tension roll is 3m, and the distance between the second tension roll and the inlet of the pickling tank is 23 m. If the strip breakage occurs at the first tension roller, the hot rolled strip steel with the strip breakage reaches the second tension roller after 2.4s at the fastest speed; if the broken strip occurs between the first tension roller and the second tension roller, calculating according to the extreme condition of the outlet position of the withdrawal and straightening machine, and enabling the broken hot rolled strip steel to reach the second tension roller after 0.9s at the fastest speed; if the strip breakage happens at the second tension roll, the hot rolled strip with the strip breakage reaches the pickling tank after 6.9s at the fastest speed.
Therefore, when the first time is less than 2s-2.5s, the broken hot rolled strip steel can be ensured to be embraced by the second compression roller above the second tension roller in a pressing mode, and even if the broken hot rolled strip steel is not embraced by the second compression roller above the third tension roller in a pressing mode, the broken hot rolled strip steel can be embraced by the third compression roller above the third tension roller in a pressing mode. When the second time is less than 0.9s-1.2s, the broken strip can be ensured to be between the first tension roller and the second tension roller, the second compression roller above the second tension roller presses down to hold the broken hot rolled strip steel, and even if the broken hot rolled strip steel is not held, the third compression roller above the third tension roller presses down to hold the broken hot rolled strip steel. And when the third time is less than 6.5-7 s, the third compression roller above the third tension roller is pressed down in time to hold the broken hot rolled strip steel when the broken strip is generated on the third tension roller.
As an alternative embodiment, the method further comprises: when the first part of the hot-rolled strip steel passes through the withdrawal and straightening unit, the running speed of the hot-rolled strip steel is controlled to be a first preset speed, and the distance between the first part and the head position or the tail position is within a preset length range.
In practical application, the head and the tail of hot rolled strip steel are considered to be easy to have folding or cross grain defects, and after the hot rolled strip steel passes through a tension leveler, the tension leveler is triggered to break the strip, so that the first part of the hot rolled strip steel is ensured to be decelerated through the tension leveler, the speed impact during strip breakage is reduced, and the risk of throwing into an acid tank after strip breakage is further reduced.
Specifically, a signal from a welding seam of the hot rolled strip steel to the stand is monitored, the signal is used as a starting point of the hot rolled strip steel, and the real-time head and tail positions of the hot rolled strip steel can be calculated by combining the running speed of the hot rolled strip steel.
As an alternative embodiment, the preset length is in the range of 0-30m, and the first preset speed is in the range of 50-70 mpm.
The folding defects generally exist within 30m of the head and the tail of the hot rolled strip steel, and in order to reduce the impact of the speed during the strip breakage, the head and the tail are set within 30m, and the hot rolled strip steel passes through a withdrawal and straightening machine at a low speed of 50-70 mpm. It should be noted that the present embodiment provides only preferred values, and is only used as a reference. The selection of the preset length range and the first preset speed can also be used for setting other ranges according to requirements. The applicant emphasizes that the overall inventive concept of the present embodiment is as follows: when the head and the tail of the hot-rolled strip steel pass through the tension leveler, the speed needs to be reduced. All solutions belonging to the same inventive concept are within the scope of protection of the present application.
The technical scheme in the embodiment of the application at least has the following technical effects or advantages:
the method comprises the steps of obtaining corresponding operating parameters of hot rolled strip steel passing through a withdrawal and straightening machine; determining whether the hot rolled strip steel has strip breakage or not based on the operation parameters; when the strip breakage of the hot-rolled strip steel exists, the hot-rolling production line is controlled to stop in time, the tension roller behind the strip breakage position is prevented from continuously dragging the strip steel, the strip steel is pulled into a pickling tank, and meanwhile three-level protection measures are established, namely the first pressing roller pressing-down on the first tension roller, the second pressing roller pressing-down on the second tension roller and the third pressing roller pressing-down on the third tension roller. When the hot rolled strip steel is broken, the compression roller above the third-level tension roller is controlled to be pressed down in time so as to hold the broken strip steel, and the pickling tank is prevented from being thrown due to inertia after the strip steel is broken. It is thus clear that this application is in time embracing the broken tape strip steel when discovering that the area is broken, makes its control method who is not got rid of into the descaling bath, has avoided the accident that the broken tape strip steel got rid of into the descaling bath to take place the back, and the accident department is loaded down with trivial details, influences the acid-rolling productivity and has the technical problem of potential safety hazard.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (7)
1. A control method for preventing strip steel from throwing into an acid tank is characterized by comprising the following steps:
obtaining operation parameters corresponding to hot rolled strip steel passing through a withdrawal and straightening machine;
determining whether the hot rolled strip steel has strip breakage or not based on the operation parameters;
when the hot rolled strip steel is broken, controlling a hot rolling production line to stop, and controlling a first press roller above a first tension roller, a second press roller above a second tension roller and a third press roller above a third tension roller to press down; the first tension roll is positioned on the inlet side of the tension leveler, the second tension roll is positioned on the outlet side of the tension leveler, the third tension roll is arranged on the outlet side of a pickling tank, and the pickling tank is arranged behind the tension leveler along the running direction of the hot rolled strip steel;
the operating parameters include: a first speed of the first tension roller and a second speed of the second tension roller; determining whether there is a strip break in the hot rolled strip based on the operating parameters comprises: obtaining a first speed difference between the first tension roll and the second tension roll, a first elongation of the hot-rolled strip steel and a second speed difference between the second tension roll and the first tension roll based on the first speed and the second speed; determining whether the hot-rolled strip steel has broken strip or not based on the first speed difference, the first elongation and the second speed difference; when any one of the conditions that the first speed difference is greater than a first speed difference threshold value, the first elongation is greater than a first elongation threshold value and the second speed difference is greater than a second speed difference threshold value is met, determining that the strip breakage exists in the hot-rolled strip steel;
alternatively, the first and second electrodes may be,
the operating parameters include: a first speed of the first tension roller, a second speed of the second tension roller and a third speed of the third tension roller; determining whether there is a strip break in the hot rolled strip based on the operating parameters comprises: obtaining a first speed difference between the first tension roller and the second tension roller, a second elongation of the hot-rolled strip steel and a third speed difference between the second tension roller and the third tension roller based on the first speed, the second speed and the third speed; determining whether the hot-rolled strip steel has a broken strip or not based on the first speed difference, the second elongation and the third speed difference; and when any one of the conditions that the first speed difference is greater than a first speed difference threshold value, the second elongation rate is greater than a second elongation rate threshold value and the third speed difference is greater than a third speed difference threshold value is met, determining that the strip breakage exists in the hot-rolled strip steel.
2. The control method for preventing the strip steel from being thrown into the acid tank as claimed in claim 1, wherein the first speed difference threshold value is 14mpm-16mpm, the first elongation threshold value is 4.5% -5%, the second elongation threshold value is 4.5% -5%, and the second speed difference threshold value is 14mpm-16 mpm; the third speed difference threshold is 9-11 mpm.
3. The method for controlling the prevention of throwing of the strip steel into the acid tank as claimed in claim 1, wherein the step of determining that the strip break exists in the hot rolled strip steel when any one of the first speed difference is greater than a first speed difference threshold, the first elongation is greater than a first elongation threshold and the second speed difference is greater than a second speed difference threshold comprises the following specific steps:
and when any one of the conditions that the first speed difference is continuously greater than the first speed difference threshold value in a first time, the first elongation is continuously greater than the first elongation threshold value in a second time, and the second speed difference is continuously greater than the second speed difference threshold value in a third time is satisfied, determining that the strip breakage exists in the hot-rolled strip steel.
4. The control method for preventing the strip steel from being thrown into the acid tank as claimed in claim 1, wherein when any one of the first speed difference being greater than a first speed difference threshold value, the second elongation being greater than a second elongation threshold value and the third speed difference being greater than a third speed difference threshold value is satisfied, the determining that the strip breakage of the hot-rolled strip steel exists specifically comprises:
and when any one of the conditions that the first speed difference is continuously greater than the first speed difference threshold value in the first time, the second elongation rate is continuously greater than the second elongation rate threshold value in the second time, and the third speed difference is continuously greater than the third speed difference threshold value in the third time is met, determining that the strip breakage exists in the hot-rolled strip steel.
5. The control method for preventing the steel strip from being thrown into the acid tank as set forth in claim 3 or 4, wherein the first time is less than 2s, the second time is less than 0.9s and the third time is less than 6.5 s.
6. The control method for preventing the throwing of the steel strip into the acid tank as claimed in claim 1, further comprising:
when the first part of the hot-rolled strip steel passes through the withdrawal and straightening unit, the running speed of the hot-rolled strip steel is controlled to be a first preset speed, and the first part is a part which is within a preset length range from the head position or the tail position.
7. The control method for preventing the throwing of the steel strip into the acid tank as claimed in claim 6, wherein the predetermined length is in the range of 0 to 30m and the first predetermined speed is in the range of 50 to 70 mpm.
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