Method for improving short stroke execution precision at the tail of a reversible roughing mill
By setting multiple hot metal detectors at the entrance of the vertical rolling mill, calculating the actual backslip, and adjusting the vertical roll gap, the problem of insufficient execution accuracy in the short stroke at the tail of the roughing mill was solved, thus improving product quality and yield.
Patent Information
- Application Number
- CN202411637432.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-15
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2044-11-15
AI Technical Summary
In the existing technology, the short-stroke execution accuracy at the tail end of the roughing mill is insufficient, resulting in a decrease in product width quality and yield. Existing correction methods are ineffective for current steel plates.
Three hot metal detectors are installed at the entrance of the vertical roll mill. The actual backslip is calculated by the actual distance between the detectors and the speed of the vertical roll mill, which accurately tracks the tail position of the steel plate. The roll gap of the vertical roll is adjusted according to the tail position to achieve precise control.
It improves the accuracy of short-stroke execution at the tail of the steel plate, thereby enhancing product width quality and yield.
Smart Images
Figure CN119549530B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of industrial automation technology, and in particular to a method for improving the short-stroke execution accuracy of the tail section of a reversible roughing mill. Background Technology
[0002] In hot continuous rolling, short-stroke control of the head and tail of the billet is performed by the roughing mill vertical rolls to prevent large heads and tails in the intermediate billet after roughing. The accuracy of the short-stroke execution directly affects the width quality and yield of the product. Currently, a scanning hot detector is generally set up before the vertical roll mill. The time when the tail of the billet reaches the hot detector is accurately detected by the detection of the scanning hot detector. Then, the tail position is tracked by the vertical roll back slip and vertical roll speed set in the second stage. After the rolling of the pass is completed, the distance between the scanning hot detector and the vertical roll is self-learned and corrected according to the actual situation. By correcting the distance between the scanning hot detector and the vertical roll, the back slip of the vertical roll in the pass is indirectly corrected. This correction method is effective for the current pass of the next steel plate, but ineffective for the short-stroke execution of the tail of the current steel plate.
[0003] If the actual backslip of the steel plate currently being rolled can be measured, using the actual backslip to track the tail of the steel plate will improve the execution accuracy of the short stroke at the tail. Summary of the Invention
[0004] To address the aforementioned technical problems in the existing technology, this invention provides a method for improving the short-stroke execution accuracy at the tail of a reversible roughing mill.
[0005] The technical solution is as follows:
[0006] A method for improving the short-stroke execution accuracy at the tail end of a reversible roughing mill, the method comprising:
[0007] S1. Three hot metal detectors are installed at the entrance of the vertical roll mill and named H1, H2 and H3 in order of distance from the vertical roll mill from farthest to closest. The distances between H1, H2 and H3 and the vertical roll mill are D1, D2 and D3, respectively.
[0008] S2, when the slab exits the furnace, L2 sets the short stroke parameters at the tail of each pass of the vertical rolling mill;
[0009] S3, during the alternate pass, when the vertical or horizontal rolling mill has a load relay signal and H1 is lost, the back slide k of the current pass of the vertical rolling mill begins according to the setting of L2. seti and the actual speed V of the vertical rolling mill real Tracking tail position L real (L real =∑V real Δtk seti Where Δt is the scan period, V realk represents the actual speed of the vertical rolling mill. seti (The backslip value of the current pass in the vertical roll mill set for L2); when H2 is detected as lost, the tail tracking length L is used as the reference. real And the actual distance between H1 and H2 is calculated to determine the actual back slide k of the vertical roll mill. real1 The tail tracking length L is corrected using the actual distance between H1 and H2. real Then, the tail end is tracked based on the vertical roll mill speed and the calculated actual back slip value; when H3 is lost, the back slip value and tail end tracking position are further corrected.
[0010] S4. When the distance between the tail end and the vertical roll mill reaches the length at the start of the short stroke, the vertical roll side pressing mechanism starts to operate and adjusts the vertical roll gap according to the short stroke parameters set by L2.
[0011] S5. When the tail of the steel plate leaves the vertical roll, the vertical roll mill continues to maintain its current position until the tail of the steel plate leaves the horizontal roll mill.
[0012] In step S1, the distance between H1 and the vertical rolling mill is less than the length of the shortest slab in the normal incoming slab. The distance between H3 and the vertical rolling mill is greater than the short stroke starting length of the tail of the vertical roll in the first pass. H2 is located between H1 and H3, and the distance from H1 is 1 / 3 (D1-D3).
[0013] In step S2, the short-stroke parameters at the tail end of each pass of the vertical roll mill include: short-stroke length L. i Length L i The deviation of the vertical roll gap relative to the body at various positions within the mill and the backslip value k of the vertical roll mill. seti , where i is an odd number, and 1≤i≤last pass.
[0014] In step S3, the tail tracking length L is used as a reference. real And the actual distance between H1 and H2 is calculated to determine the actual back slide k of the vertical roll mill. real The method is as follows:
[0015] k real1 =k seti -λ[L real / (D1-D2)-1]
[0016] Where λ is a correction coefficient, ranging from 0.6 to 0.8, and -0.15 ≤ λ[L] real / (D1-D2)-1]≤0.15, and 0.7≤k real1 ≤0.9; k seti The set backslip value for the first pass of the vertical roll mill;
[0017] k real1This is the backslip value after the first correction during the odd-track time.
[0018] The length L of tail tracking is corrected using the true distance between H1 and H2. real Specifically, at the moment H2 is detected as lost, the distance between H1 and H2 is taken as the tail tracking length.
[0019] When H3 is detected as lost in step S3, the method for further correcting the backslip value and tail tracking position is as follows:
[0020] k real2 =k real1 -λ[L real / (D1-D3)-1]
[0021] Where λ is a correction coefficient, ranging from 0.6 to 0.8, and -0.15 ≤ λ[L] real / (D1-D3)-1]≤0.15, and 0.7≤k real2 ≤0.9;
[0022] k real2 This is the backslip value after the second correction during the odd-track time.
[0023] The tail tracking position correction is as follows: at the moment of H3 loss detection, the distance between H1 and H3 is taken as the tail tracking length.
[0024] In step S4, when the distance between the tail end and the vertical roll mill reaches the length at the start of the short stroke, it refers to D1-L. real ≤L i , where L i The short stroke start length (from the end of the tail) of the current pass of the vertical roll mill set for L2.
[0025] The beneficial effects of the technical solutions provided in the embodiments of the present invention include at least the following:
[0026] In the above scheme, L2 sets the short stroke length of the roughing mill tail and the deviation of the vertical roll gap relative to the main body at each position within this length. Three hot metal detectors (i.e., hot metal detectors) are set in front of the roughing mill vertical roll mill. L1 calculates the back slip of the vertical roll mill based on the actual distance between the three hot metal detectors, the hot metal detector failure status, the load relay signals of the vertical roll and flat roll, and the actual speed of the vertical roll. Based on the back slip, the tail position of the steel plate is accurately tracked, and the actual roll gap of the vertical roll is controlled to match the L2 requirement. This method, based on the back slip set in two stages, corrects the calculated true back slip of the slab through multiple hot metal detectors, which can improve the tail tracking accuracy of the currently rolled steel plate, thereby improving the width control accuracy. Attached Figure Description
[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0028] Figure 1 This is a flowchart of a method for improving the short-stroke execution accuracy of the tail section of a reversible roughing mill, provided by an embodiment of the present invention. Detailed Implementation
[0029] The technical solution of the present invention will now be described with reference to the accompanying drawings.
[0030] In embodiments of the present invention, words such as "exemplarily," "for example," etc., are used to indicate that something is an example, illustration, or description. Any embodiment or design described as "exemplary" in the present invention should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of the word "exemplary" is intended to present the concept in a concrete manner. Furthermore, in embodiments of the present invention, the meaning expressed by "and / or" can be both, or either one.
[0031] In this embodiment of the invention, sometimes a subscript such as W1 may be written in a non-subscript form such as W1. When the difference is not emphasized, the meaning they express is the same.
[0032] To make the technical problems, technical solutions and advantages of the present invention clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.
[0033] This invention provides a method for improving the short-stroke execution accuracy at the tail end of a reversible roughing mill. For example... Figure 1 The flowchart shown illustrates a method for improving the short-stroke execution accuracy at the tail end of a reversible roughing mill. This method may include the following steps:
[0034] S1. Three hot metal detectors are installed at the entrance of the vertical roll mill and named H1, H2 and H3 in order of distance from the vertical roll mill from farthest to closest. The distances between H1, H2 and H3 and the vertical roll mill are D1, D2 and D3, respectively.
[0035] S2, when the slab exits the furnace, L2 sets the short stroke parameters at the tail of each pass of the vertical rolling mill;
[0036] S3, during the alternate pass, when the vertical or horizontal rolling mill has a load relay signal and H1 is lost, the back slide k of the current pass of the vertical rolling mill begins according to the setting of L2. seti And the actual speed of the vertical rolling mill tracks the tail position; when H2 is lost, the tail tracking length L is used as the reference. realAnd the actual distance between H1 and H2 is calculated to determine the actual back slide k of the vertical roll mill. real1 The tail tracking length L is corrected using the actual distance between H1 and H2. real Then, the tail end is tracked based on the vertical roll mill speed and the calculated actual back slip value; when H3 is lost, the back slip value and tail end tracking position are further corrected.
[0037] S4. When the distance between the tail end and the vertical roll mill reaches the distance at the start of the short stroke, the vertical roll side pressing mechanism starts to operate and adjusts the vertical roll gap according to the short stroke parameters set by L2.
[0038] S5. When the tail of the steel plate leaves the vertical roll, the vertical roll mill continues to maintain its current position until the tail of the steel plate leaves the horizontal roll mill.
[0039] In practical applications, assuming that the distances of H1, H2, and H3 from the vertical rolling mill are D1 6m, D2 4m, and D3 2m, respectively, and the secondary setting for a certain special track vertical roll backslip is 0.75, the starting position of the short tail stroke is 1.8m, and λ is taken as 0.7, when H2 is detected as lost, the tail tracking length L... real If it is 2.2m, then k real1 =0.75-0.7x[2.2 / (6-4)-1]=0.75-0.07=0.68, take k real1 =0.7, corrected L real =6m-4m=2m; When H3 is lost, L real =3.95m, k real2 =0.7-0.7x[3.95 / (6-2)-1]=0.70875, take k real2 =0.70875, corrected L real =6m-2m=4m; when L real The short-stroke operation begins when the distance is 6 - 1.8 = 4.2m.
[0040] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.
Claims
1. A method for improving the short-stroke execution accuracy at the tail end of a reversible roughing mill, characterized in that, The method includes: S1. Three hot metal detectors are installed at the entrance of the vertical roll mill and named H1, H2 and H3 in order of distance from the vertical roll mill from farthest to closest. The distances between H1, H2 and H3 and the vertical roll mill are D1, D2 and D3, respectively. S2, when the slab exits the furnace, L2 sets the short stroke parameters at the tail of each pass of the vertical rolling mill; S3, during the alternate pass, when the vertical or horizontal rolling mill has a load relay signal and H1 is lost, the back slide k of the current pass of the vertical rolling mill begins according to the setting of L2. seti and the actual speed V of the vertical rolling mill real Tracking tail position L real When H2 is detected as lost, the tail tracking length L is used as the basis for the calculation. real And the actual distance between H1 and H2 is calculated to determine the actual back slide k of the vertical roll mill. real1 The tail tracking length L is corrected using the actual distance between H1 and H2. real Then, the tail end is tracked based on the vertical roll mill speed and the calculated actual back slip value; when H3 is lost, the back slip value and tail end tracking position are further corrected. S4. When the distance between the tail end and the vertical roll mill reaches the length at the start of the short stroke, the vertical roll side pressing mechanism starts to operate and adjusts the vertical roll gap according to the short stroke parameters set by L2. S5. When the tail of the steel plate leaves the vertical roll, the vertical roll mill continues to maintain its current position until the tail of the steel plate leaves the horizontal roll mill.
2. The method for improving the short-stroke execution accuracy at the tail end of a reversible roughing mill according to claim 1, characterized in that, In S1, the distance between H1 and the vertical rolling mill is less than the length of the shortest slab in the normal incoming slab. The distance between H3 and the vertical rolling mill is greater than the short stroke starting length of the tail of the vertical roll in the first pass. H2 is located between H1 and H3, and the distance from H1 is 1 / 3 (D1-D3).
3. The method for improving the short-stroke execution accuracy at the tail end of a reversible roughing mill according to claim 1, characterized in that, The short-stroke parameters at the tail end of each pass of the S2 vertical rolling mill include: short-stroke start length L. i Length L i The deviation of the vertical roll gap relative to the body at various positions within the mill and the backslip value k of the vertical roll mill. seti , where i is an odd number, and 1≤i≤last pass.
4. The method for improving the short-stroke execution accuracy at the tail end of a reversible roughing mill according to claim 1, characterized in that, The tail position L of S3 real The calculation formula is as follows: L real =∑V real Δtk seti Where Δt is the scan period, V real k represents the actual speed of the vertical rolling mill. seti The backslip value set for the current pass of the vertical roll mill for L2.
5. The method for improving the short-stroke execution accuracy at the tail end of a reversible roughing mill according to claim 1, characterized in that, In S3, the tail tracking length L is used as a reference. real And the actual distance between H1 and H2 is calculated to determine the actual back slide k of the vertical roll mill. real1 The method is as follows: k real1 =k seti -λ[L real / (D1-D2)-1] Where λ is a correction coefficient, ranging from 0.6 to 0.8, and -0.15 ≤ λ[L] real / (D1-D2)-1]≤0.15, and 0.7≤k real1 ≤0.9; k seti The set backslip value for the current pass of the vertical roll mill; k real1 This is the backslip value after the first correction during the odd-track time.
6. The method for improving the short-stroke execution accuracy at the tail end of a reversible roughing mill according to claim 1, characterized in that, The length L of tail tracking is corrected using the true distance between H1 and H2. real Specifically, at the moment H2 is detected as lost, the distance between H1 and H2 is taken as the tail tracking length.
7. The method for improving the short-stroke execution accuracy at the tail end of a reversible roughing mill according to claim 1, characterized in that, When H3 is detected as lost in S3, the method for further correcting the backslip value and tail tracking position is as follows: k real2 =k real1 -λ[L real / (D1−D3)−1] Where λ is a correction coefficient, ranging from 0.6 to 0.8, and -0.15 ≤ λ[L] real / (D1-D3)-1]≤0.15, and 0.7≤k real2 ≤0.9; k real2 This is the backslip value after the second correction during the odd-track sequence; The tail tracking position correction is as follows: at the moment of H3 loss detection, the distance between H1 and H3 is taken as the tail tracking length.
8. The method for improving the short-stroke execution accuracy of the tail section of a reversible roughing mill according to claim 1, characterized in that, When the distance from the tail end of the vertical rolling mill in S4 reaches the length at the start of the short stroke, it refers to D1-L. real ≤L i , where L i The starting length of the short stroke at the end of the current pass in the vertical roll mill is set for L2.
Citation Information
Patent Citations
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