Method for judging detection precision of bending roll force value of hot continuous rolling strip steel

Abstract

The application discloses a kind of hot strip bending roll force value detection precision judging method, this method is used in hot strip finishing mill group, comprising: determine whether the rack of finishing mill enters roll changing state, after entering roll changing state and the release of rack working roll balance mode, the rod cavity pressure detection value of current rack is obtained at bending roll hydraulic cylinder;According to the rod cavity pressure detection value of bending roll hydraulic cylinder obtained, whether the bending roll force value detection precision is abnormal is judged.The hot strip bending roll force value detection precision judging method of the application can determine whether the accuracy of strip bending roll force value detection precision to ensure the control precision of strip bending roll force, can solve the problem of unstable shape of hot strip finishing strip due to bending roll force measurement abnormality, reduce the strip shape quality objection of hot strip finishing mill group.

Description

Technical Field

[0001] This invention relates to the field of steel rolling technology, and in particular to a method for judging the accuracy of bending roll force value detection in hot strip rolling. Background Technology

[0002] Hot-rolled strip steel occupies an important position in the entire industrial system. Among them, strip shape is a key indicator for measuring whether the quality of hot-rolled strip steel products is qualified, and strip shape control is an important technology in strip steel production.

[0003] Hydraulic roll bending control is one of the most important methods for strip shape control in hot strip mills. The control process involves generating a certain thrust through a hydraulic cylinder at the mill's end, which acts on the roll's journal, causing the roll to bend additionally. This changes the roll's deflection, altering the shape of the loaded roll gap and the lateral tension distribution, thereby controlling the strip shape. The ultimate goal of strip shape control is to ensure good straightness of the strip exiting each stand, and controlling the roll bending force is a crucial method for achieving this straightness.

[0004] During the rolling process in a hot strip mill, as the rolling unit volume and billet weight increase, inaccurate detection of the actual value of the finishing roll force can affect the precision control of the strip bending roll force, leading to a large number of strip shape discrepancies and severely impacting rolling stability. Furthermore, due to the lag in feedback from downstream processes regarding strip shape discrepancies, this can also cause shape problems in batches of strip, seriously affecting the normal operation of the hot strip mill line. Summary of the Invention

[0005] To address some or all of the technical problems existing in the prior art, the present invention provides a method for judging the accuracy of hot strip bending roll force detection.

[0006] The technical solution of the present invention is as follows:

[0007] A method for judging the accuracy of bending roll force value detection in hot strip mill is provided. The method is used in hot strip mill finishing mill and includes: determining whether the mill stand of the finishing mill has entered the roll changing state; after entering the roll changing state and the mill stand work roll balance mode is released, obtaining the rod chamber pressure detection value of the bending roll hydraulic cylinder at the current mill stand.

[0008] Based on the obtained pressure detection value of the rod chamber of the bending roller hydraulic cylinder, determine whether the bending roller force detection accuracy is abnormal.

[0009] In some possible implementations, the accuracy of the bending roll force detection is determined based on the obtained pressure detection value of the rod chamber of the bending roll hydraulic cylinder, including:

[0010] If the pressure detection value of the rod chamber of the bending roller hydraulic cylinder is within the preset deviation range, it is determined that the bending roller force detection accuracy is normal.

[0011] If the pressure detection value of the rod chamber of the bending roller hydraulic cylinder is not within the preset deviation range, it is determined that the bending roller force detection accuracy is abnormal.

[0012] In some possible implementations, if X < M + L - HY and X > M - L + HY, then the accuracy of the bending roller force detection is judged to be normal.

[0013] If X > M + L or X < ML, then the accuracy of the bending roller force value detection is abnormal.

[0014] If M+L-HY≤X≤M+L or ML≤X≤M-L+HY, then the bending roller force value detection accuracy is normal.

[0015] Where X represents the pressure detection value of the rod chamber of the bending roller hydraulic cylinder, M represents the preset initial judgment value, L represents the maximum value of the pressure detection error of the rod chamber of the bending roller hydraulic cylinder, and HY represents the preset detection dead zone value.

[0016] In some possible implementations, the controller automatically determines whether the bending roll force detection accuracy is abnormal based on the obtained pressure detection value of the rod chamber of the bending roll hydraulic cylinder.

[0017] In some possible implementations, based on the obtained pressure detection value of the rod chamber of the bending roller hydraulic cylinder, the controller automatically determines whether the bending roller force detection accuracy is abnormal, including:

[0018] Input the obtained pressure detection value of the rod chamber of the bending roller hydraulic cylinder into the controller;

[0019] The pressure detection value of the rod chamber of the bending roller hydraulic cylinder is processed using the preset data processing algorithm in the controller to obtain the processing result;

[0020] Based on the processing results, the controller is used to determine whether the accuracy of the bending roller force value detection is abnormal.

[0021] In some possible implementations, the data processing algorithm in the controller is set as follows:

[0022]

[0023] Based on the processing results, the controller is used to determine whether the accuracy of the bending roller force value detection is abnormal, including:

[0024] If QU = 0 and QL = 0, the controller determines that the bending roller force detection accuracy is normal; if QU = 1 or QL = 1, the controller determines that the bending roller force detection accuracy is abnormal.

[0025] Among them, when M+L-HY≤X≤M+L or ML≤X≤M-L+HY, the bending roll force value detection accuracy is directly judged to be normal.

[0026] Where X represents the pressure detection value of the rod chamber of the bending roller hydraulic cylinder, M represents the preset initial judgment value, L represents the maximum value of the pressure detection error of the rod chamber of the bending roller hydraulic cylinder, HY represents the preset detection dead zone value, and QU and QL represent preset variables in the controller.

[0027] In some possible implementations, the method further includes:

[0028] When the accuracy of the bending roller force value detection is found to be abnormal, the controller will issue an alarm.

[0029] In some possible implementations, M is set to 0, and L is set to 5.0 * 10. 5 The values ​​of Pa and HY range from 0.5 to 10. 5 Pa ~ 1.5 * 10 5 Pa.

[0030] The main advantages of the technical solution of this invention are as follows:

[0031] The method for judging the accuracy of hot strip bending roll force value detection of the present invention can determine whether the strip bending roll force value detection accuracy is accurate in order to ensure the accuracy of strip bending roll force control. It can solve the problem of unstable strip shape of hot strip finishing mill caused by abnormal bending roll force measurement, reduce the quality of strip shape of hot strip finishing mill, reduce downtime due to failure, and improve the production efficiency of the mill. Attached Figure Description

[0032] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and constitute a part of this invention, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0033] Figure 1 This is a flowchart illustrating a method for determining the accuracy of hot-rolled strip bending roll force detection according to an embodiment of the present invention. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0035] The technical solutions provided by the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0036] refer to Figure 1An embodiment of the present invention provides a method for judging the accuracy of hot strip bending roll force detection. The method is used in hot strip finishing mills and includes the following steps:

[0037] Step S1: Determine whether the mill stand of the finishing mill has entered the roll changing state. After entering the roll changing state and the mill stand's work roll balance mode is released, obtain the rod chamber pressure detection value of the bending roll hydraulic cylinder at the current mill stand.

[0038] Specifically, during the production operation of the finishing mill, it is determined in real time whether the mill stand has entered the roll changing state. When the mill stand is put into roll changing mode, the work roll balancing mode of that mill stand will be switched to OFF, that is, the work roll balancing mode is released. After the work roll balancing mode of the mill stand is released, the pressure of the rod chamber of the bending roll hydraulic cylinder at the current mill stand is detected, and the pressure value of the rod chamber of the bending roll hydraulic cylinder at the current mill stand is obtained.

[0039] In one embodiment of the present invention, a pressure sensor can be installed at the rod chamber of the bending roller hydraulic cylinder to detect the pressure in the rod chamber and obtain the pressure detection value of the rod chamber of the bending roller hydraulic cylinder.

[0040] Specifically, when the pressure sensor is used to detect the pressure in the rod chamber of the bending roll hydraulic cylinder and obtain the detected value of the pressure in the rod chamber of the bending roll hydraulic cylinder, the detected value of the pressure in the rod chamber of the bending roll hydraulic cylinder is equal to the product of the detected value of the pressure sensor and the cross-sectional area of ​​the rod chamber.

[0041] Step S2: Based on the obtained pressure detection value of the rod chamber of the bending roller hydraulic cylinder, determine whether the bending roller force detection accuracy is abnormal.

[0042] Under normal circumstances, after the work roll balancing mode of the frame is switched to OFF, that is, after the work roll balancing mode of the frame is released, there is no pressure in the rod chamber of the bending roll hydraulic cylinder at that frame. Considering the pressure fluctuations and detection errors that may occur during the pressure detection process, in one embodiment of the present invention, the accuracy of the bending roll force detection is determined based on the obtained pressure detection value of the rod chamber of the bending roll hydraulic cylinder, which further includes:

[0043] If the pressure detection value of the rod chamber of the bending roller hydraulic cylinder is within the preset deviation range, it is determined that the bending roller force detection accuracy is normal.

[0044] If the pressure detection value of the rod chamber of the bending roller hydraulic cylinder is not within the preset deviation range, it is determined that the bending roller force detection accuracy is abnormal.

[0045] Specifically, if X < M + L - HY and X > M - L + HY, then the accuracy of the bending roller force value detection is normal.

[0046] If X > M + L or X < ML, then the accuracy of the bending roller force value detection is abnormal.

[0047] If M+L-HY≤X≤M+L or ML≤X≤M-L+HY, then the bending roller force value detection accuracy is normal.

[0048] Where X represents the pressure detection value of the rod chamber of the bending roller hydraulic cylinder, M represents the preset initial judgment value, L represents the maximum value of the pressure detection error of the rod chamber of the bending roller hydraulic cylinder, HY represents the preset detection dead zone value, and HY is used to indicate the pressure detection fluctuation.

[0049] Specifically, when a pressure sensor is used to detect the pressure in the rod chamber of the bending roll hydraulic cylinder and obtain the detected value of the pressure in the rod chamber of the bending roll hydraulic cylinder, the maximum value of the detection error of the pressure in the rod chamber of the bending roll hydraulic cylinder is the maximum detection error of the pressure sensor.

[0050] In one embodiment of the present invention, for a 7-stand finishing mill, M is set to 0 and L is set to 5.0*10. 5 The values ​​of Pa and HY range from 0.5 to 10. 5 Pa ~ 1.5 * 10 5 The specific values ​​of Pa and HY are selected within the range based on the actual situation.

[0051] Furthermore, in one embodiment of the present invention, based on the obtained pressure detection value of the rod chamber of the bending roller hydraulic cylinder, the controller automatically determines whether the bending roller force detection accuracy is abnormal.

[0052] By using a controller to automatically determine whether the bending roller force detection accuracy is abnormal, data processing efficiency can be improved, thereby timely detection of abnormalities and ensuring the reliability of the judgment results.

[0053] Specifically, in one embodiment of the present invention, based on the obtained pressure detection value of the rod chamber of the bending roller hydraulic cylinder, the controller automatically determines whether the bending roller force detection accuracy is abnormal, further including:

[0054] Input the obtained pressure detection value of the rod chamber of the bending roller hydraulic cylinder into the controller;

[0055] The pressure detection value of the rod chamber of the bending roller hydraulic cylinder is processed using the preset data processing algorithm in the controller to obtain the processing result;

[0056] Based on the processing results, the controller is used to determine whether the accuracy of the bending roller force value detection is abnormal.

[0057] In one embodiment of the present invention, referring to the above-mentioned method for determining whether the bending roll force value detection accuracy is abnormal, the data processing algorithm in the controller is set as follows:

[0058]

[0059] Where X represents the pressure detection value of the rod chamber of the bending roller hydraulic cylinder, M represents the preset initial judgment value, L represents the maximum value of the pressure detection error of the rod chamber of the bending roller hydraulic cylinder, HY represents the preset detection dead zone value, and QU and QL represent preset variables in the controller.

[0060] Similarly, when a pressure sensor is used to detect the pressure in the rod chamber of the bending roll hydraulic cylinder and obtain the detected value of the pressure in the rod chamber of the bending roll hydraulic cylinder, the maximum value of the detection error of the pressure in the rod chamber of the bending roll hydraulic cylinder is the maximum detection error of the pressure sensor.

[0061] For the 7-stand finishing mill, M is set to 0, and L is set to 5.0*10. 5 The values ​​of Pa and HY range from 0.5 to 10. 5 Pa ~ 1.5 * 10 5 The specific values ​​of Pa and HY are selected within the range based on the actual situation.

[0062] Furthermore, based on the data processing algorithm described above, and according to the processing results, the controller determines whether the accuracy of the bending roller force detection is abnormal, specifically including:

[0063] If QU = 0 and QL = 0, the controller determines that the bending roller force detection accuracy is normal. If QU = 1 or QL = 1, the controller determines that the bending roller force detection accuracy is abnormal.

[0064] Furthermore, when M+L-HY≤X≤M+L or ML≤X≤M-L+HY, it falls within the normal fluctuation range of the system pressure and is within the allowable error range for detection accuracy. In this case, the hot continuous rolling control system directly judges that the detection accuracy of the bending roll force value is normal.

[0065] Furthermore, in one embodiment of the present invention, the method further includes:

[0066] When the accuracy of the bending roller force value detection is found to be abnormal, the controller will issue an alarm.

[0067] By issuing an alarm when an anomaly occurs, staff can be promptly reminded to check and address the bending roll force detection circuit, thus preventing batches of strip steel from exhibiting abnormal shape.

[0068] In one embodiment of the present invention, the controller is a Siemens TDC.

[0069] To make the above technical solutions of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to examples. Obviously, the described examples are only some embodiments of the present invention, and not all embodiments.

[0070] Example 1

[0071] Taking the F2 stand of a certain finishing mill as an example, the preset initial judgment value M corresponding to the stand is set to 0, and the maximum value of the pressure detection error L of the rod chamber of the bending roll hydraulic cylinder is set to 5.0*10. 5 Pa, the preset detection dead zone value HY is 1.5*10 5 Pa.

[0072] When changing rolls on this frame, after the work roll balancing mode is OFF, the pressure detection value X from the rod chamber of the bending roll hydraulic cylinder is 0. At this time, we can obtain X = 0, which is less than M + L - HY = 0 + 5.0 * 10. 5 -1.5*10 5 =3.5*10 5 And X = 0 is greater than M - L + HY = 0 - 5.0 * 10 5 +1.5*10 5 = -3.5 * 10 5 That is, the rod chamber pressure detection value X of the bending roll hydraulic cylinder meets the conditions of X < M + L - HY and X > M - L + HY, the bending roll force detection accuracy is accurate, and it can meet the bending roll force process control requirements, so the finishing mill can be used for normal production.

[0073] Example 2

[0074] Taking the F6 stand of a certain finishing mill as an example, the preset initial value M corresponding to the stand is 0, and the maximum value L of the pressure detection error in the rod chamber of the bending roll hydraulic cylinder is 5.0*10. 5 Pa, the preset detection dead zone value HY is 0.5*10 5 Pa.

[0075] When changing rolls on this frame, after the work roll balancing mode is turned off, the pressure detection value X from the rod chamber of the bending roll hydraulic cylinder is 10.0*10. 5 Pa. At this time, X = 10.0 * 10 5 Pa is greater than M + L = 0 + 5.0 * 10 5 =5.0*10 5 If the pressure detection value X of the rod chamber of the bending roll hydraulic cylinder meets the condition X>M+L, the bending roll force detection accuracy is abnormal and cannot meet the bending roll force process control requirements, so the finishing mill needs to be overhauled.

[0076] Example 3

[0077] Taking the F5 stand of a certain finishing mill as an example, the preset initial value M corresponding to the stand is 0, and the maximum value L of the pressure detection error in the rod chamber of the bending roll hydraulic cylinder is 5.0*10. 5 Pa, the preset detection dead zone value HY is 0.5*10 5 Pa.

[0078] When changing rolls on this frame, after the work roll balancing mode is turned off, the pressure detection value X from the rod chamber of the bending roll hydraulic cylinder is 0.4*10. 5 Pa. At this time, X = 0.4 * 10 5 Less than M + L - HY = 0 + 5.0 * 10 5 -0.5*10 5 =4.5*10 5 And X = 0.4 * 10 5 Greater than M-L+HY=0-5.0*10 5 +0.5*10 5 =-4.5*10 5 That is, the rod chamber pressure detection value X of the bending roll hydraulic cylinder meets the conditions of X < M + L - HY and X > M - L + HY, the bending roll force detection accuracy is accurate, and it can meet the bending roll force process control requirements, so the finishing mill can be used for normal production.

[0079] The method for judging the accuracy of hot strip bending roll force value detection provided in one embodiment of the present invention can determine whether the accuracy of strip bending roll force value detection is accurate in order to ensure the accuracy of strip bending roll force control. It can solve the problem of unstable strip shape of hot strip finishing mill caused by abnormal bending roll force measurement, reduce the quality of strip shape of hot strip finishing mill, reduce downtime due to failure, and improve the production efficiency of the mill.

[0080] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Additionally, the terms "front," "back," "left," "right," "upper," and "lower" in this document refer to the placement shown in the accompanying drawings.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for judging the accuracy of hot strip bending roll force detection, characterized in that, The method is used in hot strip finishing mills and includes: Determine whether the stand of the finishing mill has entered the roll changing state. After entering the roll changing state and the work roll balance mode of the stand is released, obtain the rod chamber pressure detection value of the bending roll hydraulic cylinder at the current stand. Based on the obtained pressure detection value of the rod chamber of the bending roller hydraulic cylinder, determine whether the bending roller force detection accuracy is abnormal; Based on the obtained pressure detection value of the rod chamber of the bending roller hydraulic cylinder, determine whether the bending roller force detection accuracy is abnormal, including: If the pressure detection value of the rod chamber of the bending roller hydraulic cylinder is within the preset deviation range, it is determined that the bending roller force detection accuracy is normal. If the pressure detection value of the rod chamber of the bending roller hydraulic cylinder is not within the preset deviation range, it is determined that the bending roller force detection accuracy is abnormal. If X < M + L - HY and X > M - L + HY, then the accuracy of the bending roller force detection is normal. If X > M + L or X < ML, then the accuracy of the bending roller force value detection is abnormal. If M+L-HY≤X≤M+L or ML≤X≤M-L+HY, then the bending roller force value detection accuracy is normal. Where X represents the pressure detection value of the rod chamber of the bending roller hydraulic cylinder, M represents the preset initial judgment value, L represents the maximum value of the pressure detection error of the rod chamber of the bending roller hydraulic cylinder, and HY represents the preset detection dead zone value.

2. The method for judging the accuracy of hot-rolled strip bending roll force value detection according to claim 1, characterized in that, Based on the obtained pressure detection value of the rod chamber of the bending roller hydraulic cylinder, the controller automatically determines whether the bending roller force detection accuracy is abnormal.

3. The method for judging the accuracy of hot-rolled strip bending roll force value detection according to claim 2, characterized in that, Based on the obtained pressure detection value of the rod chamber of the bending roller hydraulic cylinder, the controller automatically determines whether the bending roller force detection accuracy is abnormal, including: Input the obtained pressure detection value of the rod chamber of the bending roller hydraulic cylinder into the controller; The pressure detection value of the rod chamber of the bending roller hydraulic cylinder is processed using the preset data processing algorithm in the controller to obtain the processing result; Based on the processing results, the controller is used to determine whether the accuracy of the bending roller force value detection is abnormal.

4. The method for judging the accuracy of hot-rolled strip bending roll force value detection according to claim 3, characterized in that, The data processing algorithm in the controller is set as follows: ； Based on the processing results, the controller is used to determine whether the accuracy of the bending roller force value detection is abnormal, including: If QU=0 and QL=0, the controller determines that the bending roller force detection accuracy is normal; if QU=1 or QL=1, the controller determines that the bending roller force detection accuracy is abnormal. Among them, when M+L-HY≤X≤M+L or ML≤X≤M-L+HY, the bending roll force value detection accuracy is directly judged to be normal. Where X represents the pressure detection value of the rod chamber of the bending roller hydraulic cylinder, M represents the preset initial judgment value, L represents the maximum value of the pressure detection error of the rod chamber of the bending roller hydraulic cylinder, HY represents the preset detection dead zone value, and QU and QL represent preset variables in the controller.

5. The method for judging the accuracy of hot-rolled strip bending roll force value detection according to claim 3 or 4, characterized in that, The method further includes: When the accuracy of the bending roller force value detection is found to be abnormal, the controller will issue an alarm.

6. The method for judging the accuracy of hot-rolled strip bending roll force value detection according to claim 1 or 4, characterized in that, M takes the value 0, and L takes the value of The range of values ​​is .

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