CN113042544B - Method and device for acquiring strip steel tail-throwing deceleration starting point - Google Patents
Method and device for acquiring strip steel tail-throwing deceleration starting point Download PDFInfo
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Abstract
The invention relates to the technical field of hot continuous rolling, in particular to a method and a device for acquiring a strip steel tail-casting deceleration starting point, wherein the method comprises the following steps: obtaining rolling strokes of the last rolling mill in N rolling mills adopted in the rolling process from the speed reduction to the tail throwing speed, wherein N is a positive integer; acquiring the frame spacing between adjacent rolling mills in the N rolling mills; based on the frame spacing, obtaining equivalent lengths of different frame spacing relative to the length of the outlet strip steel of the last rolling mill; based on the rolling stroke and the equivalent length, the rolling mill position of the strip steel tail-casting deceleration starting point is obtained, and the strip steel tail-casting deceleration starting point obtained in the mode cannot be too late in deceleration or cause tail-casting accidents, so that the strip steel tail-casting deceleration starting point is just right in time.
Description
Technical Field
The invention relates to the technical field of hot continuous rolling, in particular to a method and a device for acquiring a strip steel tail-throwing deceleration starting point.
Background
In the hot rolling production process, the unstable tail throwing phenomenon of the tail throwing easily occurs, so that fragments generated at the tail of the strip steel are stuck to a roller, the roller is damaged, the surface quality defect of the strip steel is also caused, the production rhythm and the strip steel quality are seriously influenced, and therefore, whether the temperature of the tail throwing of the roller is safe or not is an important factor influencing the quality of a steel coil and the state of the roller, and the method has important significance for rolling production.
The normal safe tail-throwing should require that the running speed of the tail part of the strip steel is less than or equal to the designated tail-throwing speed when the tail part of the strip steel is far from the last finishing mill, which has certain requirement on the speed-reducing time, if the speed-reducing time is too early, the temperature of the strip steel can not be ensured, so that the performance is poor, and if the speed-reducing time is too late, the tail-throwing accident can be caused.
Therefore, how to grasp the deceleration timing is a technical problem to be solved.
Disclosure of Invention
The present invention has been made in view of the above problems, and provides a method and apparatus for acquiring a deceleration start point of tail-out of a strip steel, which overcome or at least partially solve the above problems.
In a first aspect, the invention provides a method for acquiring a strip steel tail-casting deceleration starting point, which comprises the following steps:
obtaining rolling strokes of the last rolling mill in N rolling mills adopted in the rolling process from the speed reduction to the tail throwing speed, wherein N is a positive integer;
acquiring the frame spacing between adjacent rolling mills in the N rolling mills;
based on the frame spacing, obtaining equivalent lengths of different frame spacing relative to the length of the outlet strip steel of the last rolling mill;
and obtaining the position of the rolling mill where the initial point of the strip steel tail casting deceleration is based on the rolling travel and the equivalent length.
Further, the step of obtaining the rolling stroke of the last rolling mill of the N rolling mills adopted in the rolling process from the speed reduction to the tail throwing speed, wherein N is a positive integer, comprises the following steps:
acquiring the initial speed of the last rolling mill in the N rolling mills before decelerating;
obtaining the tail throwing speed of the last rolling mill;
acquiring the acceleration of the last rolling mill;
acquiring the time required for the last rolling mill to decelerate from the initial speed to the tail throwing speed;
based on the initial speed, the tail-casting speed, the acceleration and the required time, a rolling stroke of the last rolling mill after decelerating to the tail-casting speed is obtained according to the following formula:
wherein ,
v is the initial speed, V out And for the tail throwing speed, beta is the acceleration, t is the required time, and L is the rolling stroke.
Further, the obtaining an equivalent length of the different stand pitches relative to the length of the outlet strip of the last rolling mill based on the stand pitches includes:
obtaining the thickness of the strip steel at the outlet of the N rolling mills;
the equivalent length of the different stand spacings relative to the length of the outlet strip of the last rolling mill is obtained according to the following formula:
L ESi l is the equivalent length of different stand spacing relative to the length of the outlet strip of the last rolling mill PS For different frame spacing, h i For the thickness of the strip steel at the outlet of any rolling mill except the last rolling mill, h H And the thickness of the strip steel at the outlet of the last rolling mill.
Further, the obtaining, based on the rolling stroke and the equivalent length, a rolling mill position where the start point of the tail-casting deceleration of the strip steel is located includes:
sequentially comparing the sum of equivalent lengths of the last rolling mill to all rolling mills in the current target rolling mill with the rolling stroke according to the sequence of the N rolling mills from back to front to obtain a comparison result;
and based on the comparison result, obtaining the position of the rolling mill where the strip steel tail-casting deceleration starting point is located.
Further, the step of sequentially comparing the sum of the equivalent lengths of all the rolling mills from the last rolling mill to the current target rolling mill with the rolling strokes according to the sequence from back to front of the N rolling mills to obtain comparison results, wherein the step of obtaining the comparison results comprises the following steps:
sequentially judging whether the sum of equivalent lengths of the last rolling mill to all rolling mills in the current target rolling mill is larger than the rolling stroke according to the sequence of the N rolling mills from back to front;
when the comparison result is larger than the first comparison result, a first comparison result is obtained;
and when the comparison result is less than or equal to the first comparison result, obtaining a second comparison result.
Further, based on the comparison result, obtaining a rolling mill position where the strip steel tail-casting deceleration starting point is located, including:
when the comparison result is a first comparison result, determining the current target rolling mill as a strip steel tail-casting deceleration starting point;
and when the comparison result is the second comparison result, continuing to move the current target rolling mill forward in the direction of the first rolling mill until the sum of the current lengths of the last rolling mill and all rolling mills in the current target rolling mill is larger than the rolling stroke, and taking the moved target rolling mill as a strip steel tail-casting deceleration starting point.
Further, the sum of the equivalent lengths after all rolling mills is specifically:
the distances between each rolling mill and the following rolling mill in all rolling mills are added together relative to the equivalent length of the outlet strip length of the last rolling mill.
In a second aspect, the present invention further provides a device for obtaining a start point of tail end casting deceleration of a strip steel, including:
the first acquisition module is used for acquiring the rolling stroke of the last rolling mill in the N rolling mills adopted in the rolling process from the speed reduction to the tail throwing speed, wherein N is a positive integer;
the second acquisition module is used for acquiring the stand distance between adjacent rolling mills in the N rolling mills;
a first obtaining module for obtaining equivalent lengths of different stand pitches relative to the length of the outlet strip steel of the last rolling mill based on the stand pitches;
and the second obtaining module is used for obtaining the rolling mill position where the strip steel tail-casting deceleration starting point is located based on the rolling stroke and the equivalent length.
In a third aspect, the present invention also provides an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the above method steps when executing the program.
In a fourth aspect, a computer readable storage medium has stored thereon a computer program which when executed by a processor performs the above-mentioned method steps.
One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:
the invention provides a method for acquiring a strip steel tail-casting deceleration starting point, which comprises the steps of acquiring a rolling stroke of a last rolling mill in N rolling mills adopted in a steel rolling process at a deceleration value tail-casting speed, and acquiring a stand distance between adjacent rolling mills in the N rolling mills; based on the stand spacing, obtaining equivalent lengths of different stand spacings relative to the length of the outlet strip of the last rolling mill; based on the rolling stroke and equivalent length, the rolling mill position of the strip steel tail-casting deceleration starting point is obtained, and the strip steel tail-casting deceleration starting point obtained in the mode cannot be too late in deceleration or cause tail-casting accidents, so that the strip steel tail-casting deceleration starting point is just in time.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also throughout the drawings, like reference numerals are used to designate like parts. In the drawings:
FIG. 1 shows a schematic flow chart of steps of a method for acquiring a deceleration starting point of tail casting with steel in an embodiment of the invention;
FIG. 2 shows a schematic diagram of a rolling pass according to an embodiment of the invention;
FIG. 3 is a schematic diagram showing the relationship between rack spacing and equivalent length in an embodiment of the present invention;
FIG. 4 is a schematic flow chart of a rolling mill for determining the initial point of strip tail-casting deceleration in an embodiment of the invention;
FIG. 5 shows a schematic structural diagram of an apparatus for acquiring a deceleration starting point with steel tail casting in an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an electronic device for implementing a method for obtaining a start point of tail-casting deceleration of a strip steel in an embodiment of the invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only to distinguish the description, and are not to be construed as indicating or implying relative importance.
Example 1
The first embodiment of the invention provides a method for obtaining a deceleration starting point of strip steel tail casting, as shown in fig. 1, comprising the following steps:
s101, obtaining the rolling stroke of the last rolling mill in N rolling mills adopted in the rolling process, wherein N is a positive integer, and the rolling stroke is reduced to the tail throwing speed.
S102, acquiring the frame spacing between adjacent rolling mills in N rolling mills;
s103, based on the frame spacing, obtaining equivalent lengths of different frame spacing relative to the length of the outlet strip steel of the last rolling mill;
and S104, obtaining the position of the rolling mill where the initial point of the strip steel tail casting deceleration is located based on the rolling stroke and the equivalent length.
In an alternative embodiment, S101 includes:
firstly, the initial speed of the last rolling mill in the N rolling mills before the reduction is obtained, the tail throwing speed of the optimal rolling mill, the acceleration of the last rolling mill and the time required for the last rolling mill to reduce from the initial speed to the tail throwing speed are also obtained. The above-described acquisition order is not limited.
Then, based on the obtained initial speed, tail throwing speed, acceleration and required time of the most sufficient rolling mill, the rolling stroke of the last rolling mill after decelerating to the tail throwing speed is obtained according to the following formula:
wherein ,
v is the initial speed of the last rolling mill, V out The tail throwing speed is beta, acceleration, t is required time, and L is rolling stroke. As particularly shown in fig. 2.
Thereby, the rolling pass of the last rolling mill is obtained according to the above formula.
Because the strip steel needs to pass through N rolling mills in the rolling process, the distance exists between adjacent rolling mills, and the distance between different rolling mills is different.
After the stand spacing is obtained, S103 is performed, based on which the equivalent length of the different stand spacing with respect to the length of the outlet strip of the last rolling mill is obtained.
First, the thickness of the N mill outlet strips needs to be obtained, including the thickness of the last mill outlet strip and the thicknesses of the other mill outlet strips.
The equivalent length of the different stand spacings relative to the length of the outlet strip of the last rolling mill is then obtained according to the following formula:
L ESi l is equivalent length of different stand spacing relative to the length of the outlet strip of the last rolling mill PS For different frame spacing, h i H is the thickness of the strip steel at the outlet of any rolling mill except the last rolling mill H The thickness of the strip steel at the outlet of the last rolling mill.
FIG. 3 is a schematic view showing the relationship between the rack spacing and the equivalent length, wherein F 1 To F N Respectively represent rolling mills which are arranged in sequence.
As can be seen from the above, the ratio of the equivalent length of the different stand spacing to the length of the outlet strip of the last rolling mill to the corresponding stand spacing is the same as the ratio of the thickness of the corresponding rolling mill outlet strip to the thickness of the last rolling mill outlet strip, whereby the equivalent length of the different stand spacing to the length of the outlet strip of the last rolling mill is determined.
And S104, obtaining the equivalent length sum of the different stand pitches relative to the length of the outlet strip steel of the last rolling mill, and obtaining the rolling mill position of the strip steel tail-casting deceleration starting point based on the rolling stroke and the equivalent length.
Specifically, the sum of equivalent lengths of the last rolling mill to all rolling mills in the current target rolling mill is sequentially compared with the rolling stroke according to the sequence of the N rolling mills from back to front, and a comparison result is obtained.
And then, based on the comparison result, obtaining the position of the rolling mill where the initial point of the strip steel tail casting deceleration is located.
The process of obtaining the comparison result is specifically described below:
firstly, judging whether the sum of equivalent lengths of all rolling mills from the last rolling mill to the current target rolling mill is larger than a rolling stroke or not according to the sequence of the N rolling mills from back to front.
Then, when the comparison result is larger than the first comparison result;
and when the comparison result is less than or equal to the first comparison result, obtaining a second comparison result.
Then, after the comparison result is obtained, when the comparison result is the first comparison result, the current target rolling mill is determined as the strip steel tail-casting deceleration starting point.
And when the comparison result is a second comparison result, continuing to move the current target rolling mill forward in the direction of the first rolling mill until the sum of the current lengths from the last rolling mill to all rolling mills in the current target rolling mill is larger than the rolling stroke, so that the moved target rolling mill is used as a strip steel tail-throwing deceleration starting point.
The sum of the equivalent lengths after all rolling mills is specifically: the distances between each rolling mill and the following rolling mill are added together respectively.
For example, as shown in FIG. 4, if there are 5 rolling mills, the last rolling mill is the fifth rolling mill, and first, starting from the last rolling mill, the second rolling mill is used as the current target rolling mill, S401 is executed, and it is determined whether the equivalent length after the last rolling mill (i.e., the equivalent length of the distance between the last rolling mill and the last rolling mill with respect to the length of the outlet strip of the last rolling mill) is greater than the rolling stroke, i.e., L < L ES5-1 Whether or not to establish; if so, when the speed is greater than the speed threshold value, S402 is executed, and the penultimate rolling mill is used as a strip steel tail-casting speed reduction starting point.
If not, i.e. if less than or equal to the threshold value, executing 403 to move the current target rolling mill forward, i.e. the current target rolling mill is the third rolling mill, i.e. the third last rolling mill, thus judging whether the sum of the equivalent length after the second last rolling mill and the equivalent length after the third last rolling mill is greater than the rolling stroke, i.e. judging that L < L ES5-1 +L ES5-2 Whether or not it is.
And the method is analogically performed until the condition that the formula is established is obtained, namely, until a target rolling mill which is determined as a strip steel tail-throwing deceleration starting point is found.
According to the above description, i.e. the comparison result is obtained by sequentially judging the sum of the equivalent lengths and the rolling strokes after all the rolling mills from the last rolling mill to the current target rolling mill in the order of N rolling mills from the back to the front, i.e. the equivalent length after the last rolling mill and the rolling stroke are firstly judged, i.e. L ESN-1 And the size of L is less than L ESN-1 When the last rolling mill is used as the target rolling mill for the strip steel tail-throwing deceleration starting point, if L is more than or equal to L ESN-1 When the equivalent length sum and rolling after all rolling mills in the penultimate rolling mill and the penultimate rolling mill are continuously judgedThe size of the stroke, i.e. L ESN-1 +L ESN-2 And the size of L is less than L ESN-1 +L ESN-2 And determining the third last rolling mill as a target rolling mill of a strip steel tail-throwing deceleration starting point, and if not, continuing to judge.
One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:
the invention provides a method for acquiring a strip steel tail-casting deceleration starting point, which comprises the steps of acquiring a rolling stroke of a last rolling mill in N rolling mills adopted in a steel rolling process at a deceleration value tail-casting speed, and acquiring a stand distance between adjacent rolling mills in the N rolling mills; based on the stand spacing, obtaining equivalent lengths of different stand spacings relative to the length of the outlet strip of the last rolling mill; based on the rolling stroke and equivalent length, the rolling mill position of the strip steel tail-casting deceleration starting point is obtained, and the strip steel tail-casting deceleration starting point obtained in the mode cannot be too late in deceleration or cause tail-casting accidents, so that the strip steel tail-casting deceleration starting point is just in time.
Example two
Based on the same inventive concept, the invention also provides a device for acquiring the initial point of the tail-throwing deceleration of the strip steel, as shown in fig. 5, comprising:
a first obtaining module 501, configured to obtain a rolling stroke of a last rolling mill of N rolling mills used in a rolling process, where N is a positive integer, from decelerating to a tail throwing speed;
a second obtaining module 502, configured to obtain a stand distance between adjacent rolling mills in the N rolling mills;
a first obtaining module 503, configured to obtain equivalent lengths of different stand pitches with respect to the length of the outlet strip of the last rolling mill based on the stand pitches;
and a second obtaining module 504, configured to obtain a rolling mill position where the tail-casting deceleration starting point of the strip steel is located based on the rolling stroke and the equivalent length.
In an alternative embodiment, the first acquisition module 501 includes:
the first acquisition unit is used for acquiring the initial speed of the last rolling mill in the N rolling mills before the reduction; obtaining the tail throwing speed of the last rolling mill; acquiring the acceleration of the last rolling mill; acquiring the time required for the last rolling mill to decelerate from the initial speed to the tail throwing speed;
the first calculating unit is used for obtaining the rolling stroke of the last rolling mill at the speed of decelerating to the tail throwing speed according to the following formula based on the initial speed, the tail throwing speed, the acceleration and the required time:
wherein ,
v is the initial speed, V out And for the tail throwing speed, beta is the acceleration, t is the required time, and L is the rolling stroke.
In an alternative embodiment, the first obtaining module 503 includes:
the second acquisition unit is used for acquiring the thickness of the strip steel at the outlet of the N rolling mills;
a second calculation unit for obtaining the equivalent length of different stand pitches relative to the length of the outlet strip of the last rolling mill according to the following formula:
L ESi l is the equivalent length of different stand spacing relative to the length of the outlet strip of the last rolling mill PS For different frame spacing, h i For the thickness of the strip steel at the outlet of any rolling mill except the last rolling mill, h H And the thickness of the strip steel at the outlet of the last rolling mill.
In an alternative embodiment, the second obtaining module 504 includes:
the comparison unit is used for sequentially comparing the sum of equivalent lengths of the last rolling mill to all rolling mills in the current target rolling mill with the rolling stroke according to the sequence of the N rolling mills from back to front to obtain a comparison result;
and the determining unit is used for obtaining the position of the rolling mill where the strip steel tail-casting deceleration starting point is located based on the comparison result.
In an alternative embodiment, the comparing unit comprises:
the judging subunit is used for sequentially judging whether the sum of equivalent lengths from the last rolling mill to all rolling mills in the current target rolling mill is larger than the rolling stroke according to the sequence from back to front of the N rolling mills;
a first comparison result obtaining subunit, configured to obtain a first comparison result when the first comparison result is greater than the first comparison result;
and a second comparison result obtaining subunit configured to obtain a second comparison result when the second comparison result is less than or equal to the second comparison result.
In an alternative embodiment, the determining unit comprises:
the first determining subunit is used for determining the current target rolling mill as the strip steel tail-casting deceleration starting point when the comparison result is a first comparison result;
and the second determining subunit is used for continuously moving the current target rolling mill forwards in the direction of the first rolling mill until the sum of the current lengths of the last rolling mill and all rolling mills in the current target rolling mill is larger than the rolling stroke when the comparison result is the second comparison result, so that the moved target rolling mill is used as a strip steel tail-casting deceleration starting point.
Example III
Based on the same inventive concept, a third embodiment of the present invention provides an electronic device, as shown in fig. 6, including a memory 604, a processor 602, and a computer program stored in the memory 604 and capable of running on the processor 602, where the steps of the above-mentioned property inspection method are implemented when the processor 402 executes the program.
Where in FIG. 6, a bus architecture (represented by bus 600), bus 600 may include any number of interconnected buses and bridges, with bus 600 linking together various circuits, including one or more processors, represented by processor 602, and memory, represented by memory 604. Bus 600 may also link together various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., as are well known in the art and, therefore, will not be described further herein. The bus interface 606 provides an interface between the bus 600 and the receiver 601 and transmitter 603. The receiver 601 and the transmitter 603 may be the same element, i.e. a transceiver, providing a means for communicating with various other apparatus over a transmission medium. The processor 602 is responsible for managing the bus 600 and general processing, while the memory 604 may be used to store data used by the processor 602 in performing operations.
Example IV
Based on the same inventive concept, a fourth embodiment of the present invention provides a computer readable storage medium, on which a computer program is stored, which when executed by a processor, implements the steps of the method for obtaining the start point of tail-off deceleration of the strip steel.
The algorithms and displays presented herein are not inherently related to any particular computer, virtual system, or other apparatus. Various general-purpose systems may also be used with the teachings herein. The required structure for a construction of such a system is apparent from the description above. In addition, the present invention is not directed to any particular programming language. It will be appreciated that the teachings of the present invention described herein may be implemented in a variety of programming languages, and the above description of specific languages is provided for disclosure of enablement and best mode of the present invention.
In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be construed as reflecting the intention that: i.e., the claimed invention requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
Those skilled in the art will appreciate that the modules in the apparatus of the embodiments may be adaptively changed and disposed in one or more apparatuses different from the embodiments. The modules or units or components of the embodiments may be combined into one module or unit or component and, furthermore, they may be divided into a plurality of sub-modules or sub-units or sub-components. Any combination of all features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or units of any method or apparatus so disclosed, may be used in combination, except insofar as at least some of such features and/or processes or units are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
Furthermore, those skilled in the art will appreciate that while some embodiments herein include some features but not others included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the following claims, any of the claimed embodiments can be used in any combination.
Various component embodiments of the invention may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. Those skilled in the art will appreciate that a microprocessor or Digital Signal Processor (DSP) may be used in practice to implement some or all of the functions of the apparatus for obtaining the start point of the tail-out deceleration of the strip steel, and some or all of the components in the electronic device according to the embodiments of the present invention. The present invention can also be implemented as an apparatus or device program (e.g., a computer program and a computer program product) for performing a portion or all of the methods described herein. Such a program embodying the present invention may be stored on a computer readable medium, or may have the form of one or more signals. Such signals may be downloaded from an internet website, provided on a carrier signal, or provided in any other form.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, third, etc. do not denote any order. These words may be interpreted as names.
Claims (8)
1. The method for acquiring the initial point of the strip steel tail-casting deceleration is characterized by comprising the following steps:
obtaining rolling strokes of the last rolling mill in N rolling mills adopted in the rolling process from the speed reduction to the tail throwing speed, wherein N is a positive integer;
acquiring the frame spacing between adjacent rolling mills in the N rolling mills;
obtaining an equivalent length of the different stand spacings relative to the outlet strip length of the last mill based on the stand spacings, comprising:
obtaining the thickness of the strip steel at the outlet of the N rolling mills;
the equivalent length of the different stand spacings relative to the length of the outlet strip of the last rolling mill is obtained according to the following formula:
L ESi l is the equivalent length of different stand spacing relative to the length of the outlet strip of the last rolling mill PS For different frame spacing, h i For the thickness of the strip steel at the outlet of any rolling mill except the last rolling mill, h N The thickness of the strip steel at the outlet of the last rolling mill;
based on the rolling travel and the equivalent length, obtaining the rolling mill position where the strip steel tail-casting deceleration starting point is located, comprising:
sequentially comparing the sum of equivalent lengths of the last rolling mill to all rolling mills in the current target rolling mill with the rolling stroke according to the sequence of the N rolling mills from back to front to obtain a comparison result;
and based on the comparison result, obtaining the position of the rolling mill where the strip steel tail-casting deceleration starting point is located.
2. The method according to claim 1, wherein the step of obtaining the rolling distance of the last rolling mill of the N rolling mills used in the rolling process to the tail-out speed, N being a positive integer, comprises:
acquiring the initial speed of the last rolling mill in the N rolling mills before decelerating;
obtaining the tail throwing speed of the last rolling mill;
acquiring the acceleration of the last rolling mill;
acquiring the time required for the last rolling mill to decelerate from the initial speed to the tail throwing speed;
based on the initial speed, the tail-casting speed, the acceleration and the required time, a rolling stroke of the last rolling mill after decelerating to the tail-casting speed is obtained according to the following formula:
wherein ,
v is the initial speed, V out And for the tail throwing speed, beta is the acceleration, t is the required time, and L is the rolling stroke.
3. The method of claim 1, wherein said sequentially comparing the sum of equivalent lengths of all rolling mills from the penultimate rolling mill to the current target rolling mill with the rolling passes in the order of the N rolling mills from back to front, comprises:
sequentially judging whether the sum of equivalent lengths from the last rolling mill to all rolling mills in the current target rolling mill is larger than the rolling stroke according to the sequence from back to front of the N rolling mills;
when the comparison result is larger than the first comparison result, a first comparison result is obtained;
and when the comparison result is less than or equal to the first comparison result, obtaining a second comparison result.
4. The method of claim 3, wherein obtaining the mill location at which the strip tail-flick deceleration start point is based on the comparison comprises:
when the comparison result is a first comparison result, determining the current target rolling mill as a strip steel tail-casting deceleration starting point;
and when the comparison result is the second comparison result, continuing to move the current target rolling mill forward in the direction of the first rolling mill until the sum of the current lengths of the last rolling mill and all rolling mills in the current target rolling mill is larger than the rolling stroke, and taking the moved target rolling mill as a strip steel tail-casting deceleration starting point.
5. The method according to claim 1, characterized in that the sum of the equivalent lengths after all rolling mills is in particular:
the distances between each rolling mill and the following rolling mill in all rolling mills are added together relative to the equivalent length of the outlet strip length of the last rolling mill.
6. The device for acquiring the initial point of the tail-throwing deceleration of the strip steel is characterized by comprising the following components:
the first acquisition module is used for acquiring the rolling stroke of the last rolling mill in the N rolling mills adopted in the rolling process from the speed reduction to the tail throwing speed, wherein N is a positive integer;
the second acquisition module is used for acquiring the stand distance between adjacent rolling mills in the N rolling mills;
a first obtaining module for obtaining equivalent lengths of different stand pitches relative to the length of the outlet strip steel of the last rolling mill based on the stand pitches;
the first obtaining module includes:
the second acquisition unit is used for acquiring the thickness of the strip steel at the outlet of the N rolling mills;
a second calculation unit for obtaining the equivalent length of different stand pitches relative to the length of the outlet strip of the last rolling mill according to the following formula:
L ESi l is the equivalent length of different stand spacing relative to the length of the outlet strip of the last rolling mill PS For different frame spacing, h i For the thickness of the strip steel at the outlet of any rolling mill except the last rolling mill, h N The thickness of the strip steel at the outlet of the last rolling mill;
the second obtaining module is used for obtaining the rolling mill position of the strip steel tail-casting deceleration starting point based on the rolling stroke and the equivalent length;
the second obtaining module includes:
the comparison unit is used for sequentially comparing the sum of equivalent lengths of the last rolling mill to all rolling mills in the current target rolling mill with the rolling stroke according to the sequence from back to front of the N rolling mills to obtain a comparison result;
and the determining unit is used for obtaining the position of the rolling mill where the strip steel tail-casting deceleration starting point is located based on the comparison result.
7. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor performs the method steps of any one of claims 1-5 when the program is executed.
8. A computer readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, carries out the method steps according to any of claims 1-5.
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Citations (1)
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| CN106345819A (en) * | 2015-07-16 | 2017-01-25 | 宝山钢铁股份有限公司 | Controlling method of hot continuous rolled and finish rolled strip steel tail rolling stability |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH0788549A (en) * | 1993-09-27 | 1995-04-04 | Nippon Steel Corp | Automatic deceleration control device of coil processing line passing speed |
| JP2001062503A (en) * | 1999-08-25 | 2001-03-13 | Kawasaki Steel Corp | Method of controlling transportation of steel to be reverse-rolled |
| JP2001105015A (en) * | 1999-10-08 | 2001-04-17 | Mitsubishi Alum Co Ltd | Automatic reduction gear and automatic decelerating method for rolling mill |
| CN102125937B (en) * | 2010-01-14 | 2012-12-12 | 宝山钢铁股份有限公司 | Temperature control method in hot-rolled strip tailing-out process |
| JP5616673B2 (en) * | 2010-04-13 | 2014-10-29 | 東芝三菱電機産業システム株式会社 | Finishing continuous rolling mill control device, control method, and control pattern creation method |
| JP5801042B2 (en) * | 2010-10-13 | 2015-10-28 | 三菱アルミニウム株式会社 | Hot rolling method |
| CN102896149B (en) * | 2012-10-18 | 2014-08-20 | 唐山国丰钢铁有限公司 | Hot-rolled strip steel rolling technology for preventing high-speed breaking-away of roughing mill |
| CN104801550B (en) * | 2014-01-24 | 2017-02-22 | 宝山钢铁股份有限公司 | Method for controlling finish rolling steel throwing speed of hot continuous rolling mill |
| CN107824618B (en) * | 2016-09-15 | 2019-03-26 | 上海梅山钢铁股份有限公司 | Tail part of band steel automatic deviation correction control method |
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| CN106345819A (en) * | 2015-07-16 | 2017-01-25 | 宝山钢铁股份有限公司 | Controlling method of hot continuous rolled and finish rolled strip steel tail rolling stability |
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