A rolling mill frame leveling method and system

Abstract

The present invention provides a rolling mill stand leveling method and system, comprising: obtaining a leveling value and working-side and drive-side tension deviation values; performing graded roll gap adjustment based on the working-side and drive-side tension deviation values; and completing stand leveling when the working-side and drive-side tension deviation values ​​and the leveling value are within a preset range. By utilizing the graded roll gap adjustment method to complete the stand leveling process, the present invention not only improves the cold rolling yield rate but also effectively controls deviation, deceleration, and belt breakage during the rolling process.

Description

Technical Field

[0001] The present invention relates to the field of automatic control technology, and in particular to a rolling mill frame leveling method and system. Background Art

[0002] During the production process of the acid-rolled UCM mill, strip breakage often occurs due to the deviation of the strip in the frame. The UCM mill itself is designed with a manual leveling function. The operator can manually adjust the leveling value based on the tension deviation value on both sides of the frame to improve the strip deviation problem. However, due to raw material reasons and adjustment techniques, there is always a problem of poor leveling effect, which leads to strip deviation, resulting in low yield rate and high scrap rate of the mill.

[0003] In addition, the strip deviation before the pickling UCM mill enters the frame is simply controlled by the closed-loop control of the correction system itself, and has no necessary connection with the leveling inside the frame. After the correction, the strip enters the frame, and when the strip deflects, it is corrected by manual leveling. However, due to the special characteristics of high tension and high speed of the strip in the frame, the adjustment range and response speed, as well as the interference factors between the correction and the frame, increase the instability of the strip deviation. If it cannot be controlled in time, the subsequent frame deviation will be amplified, causing a strip breakage accident. Summary of the Invention

[0004] In order to overcome the deficiencies of the prior art, the present invention aims to provide a rolling mill stand leveling method and system.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] A rolling mill stand leveling method, comprising:

[0007] Obtain the leveling value, working side and transmission side tension deviation value;

[0008] Perform graded roll gap adjustment according to the tension deviation values ​​of the working side and the transmission side;

[0009] When the tension deviation value between the working side and the transmission side and the leveling value are within a preset range, the frame leveling is completed.

[0010] Preferably, the step of adjusting the roller gap in grades according to the tension deviation values ​​of the working side and the transmission side includes:

[0011] When the tension deviation between the working side and the transmission side is less than 5 kN, the leveling roller gap is adjusted at 0.1 mm / s;

[0012] When the tension deviation between the working side and the transmission side is greater than or equal to 5 kN and less than 10 kN, the leveling roller gap is adjusted at 0.2 mm / s;

[0013] When the tension deviation between the working side and the transmission side is greater than or equal to 10 kN, the rolling mill is slowed down to 50 m / min for 3 seconds.

[0014] The present invention also provides a rolling mill stand leveling system, comprising:

[0015] Parameter acquisition module, used to obtain leveling value, working side and transmission side tension deviation value;

[0016] A graded adjustment module, used for performing graded roll gap adjustment according to the tension deviation values ​​of the working side and the transmission side;

[0017] The parameter adjustment module is used to complete the frame leveling when the tension deviation value between the working side and the transmission side and the leveling value are within a preset range.

[0018] Preferably, the grading adjustment module includes:

[0019] The graded adjustment unit is used to adjust the leveling roller gap by 0.1mm / s when the tension deviation between the working side and the transmission side is less than 5kN;

[0020] When the tension deviation between the working side and the transmission side is greater than or equal to 5 kN and less than 10 kN, the leveling roller gap is adjusted at 0.2 mm / s;

[0021] When the tension deviation between the working side and the transmission side is greater than or equal to 10 kN, the rolling mill is slowed down to 50 m / min for 3 seconds.

[0022] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0023] The present invention provides a rolling mill stand leveling method and system, comprising: obtaining a leveling value and working-side and drive-side tension deviation values; performing graded roll gap adjustment based on the working-side and drive-side tension deviation values; and completing stand leveling when the working-side and drive-side tension deviation values ​​and the leveling value are within a preset range. By utilizing the graded roll gap adjustment method to complete the stand leveling process, the present invention not only improves the cold rolling yield rate but also effectively controls deviation, deceleration, and belt breakage during the rolling process. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 A flow chart of a rolling mill stand leveling method according to an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the leveling principle of the rolling mill stand in the embodiment provided by the present invention. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0029] The terms "first," "second," "third," and "fourth," etc., in the specification, claims, and drawings of this application are used to distinguish between different items, not to describe a particular order. Furthermore, the terms "including," "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a statement that a sequence of steps, a process, or a method is included is not limited to the listed steps but may optionally include steps not listed, or may optionally include other steps inherent to the process, method, product, or apparatus.

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] See also Figure 1 , a rolling mill stand leveling method, comprising:

[0032] Step 1: Obtain the leveling value, working side and transmission side tension deviation values;

[0033] Step 2: adjusting the graded roll gap according to the tension deviation values ​​of the working side and the transmission side;

[0034] Step 3: When the tension deviation value of the working side and the transmission side and the leveling value are within a preset range, the frame leveling is completed.

[0035] Furthermore, step 2 includes:

[0036] When the tension deviation between the working side and the transmission side is less than 5 kN, the leveling roller gap is adjusted at 0.1 mm / s;

[0037] When the tension deviation between the working side and the transmission side is greater than or equal to 5 kN and less than 10 kN, the leveling roller gap is adjusted at 0.2 mm / s;

[0038] When the tension deviation between the working side and the transmission side is greater than or equal to 10 kN, the rolling mill is slowed down to 50 m / min for 3 seconds.

[0039] The rack leveling of the present invention is further described below with reference to specific embodiments:

[0040] 1. Optimize the original leveling function

[0041] In the control program, the original leveling function is optimized. The original design only has the working side leveling and transmission side leveling functions. The operator can manually press down or lift the roller gap from the operating table. Figure 1 The following is a schematic diagram of the leveling operation within the frame. The current speed of the roll gap working side and the operating side is 0.1 mm / s. Now, in the control program, the tension deviation range is refined and optimized to establish a segmented control range. The data model is shown in Table 1 below:

[0042] Table 1

[0043]

[0044] 2. Added non-zero control function before the rack

[0045] The optimized in-rack leveling function now includes a new pre-rack non-zero control function. This relationship is established through a tension deviation model, enabling data communication between the mainline and the correction control system, as well as pre-rack feedback of non-zero correction data. This improved strip leveling control ensures more stable in-rack strip leveling and effectively controls strip deviation caused by disturbances. In the actual logic programming diagram, a new leveling intervention speed judgment is added to the control logic. When a non-zero control value is input, the rolling mill speed is required to be no more than 180 mpm (meters / minute), and the amplitude of each change is less than 4 mm (inclusive) to avoid large disturbances caused by manual adjustment of data errors; then the input value of the center position of the 8 correction plates in front of the frame is compared with the current value, and it is required not to exceed 4 mm to prevent the risk of strip deviation caused by input errors; establish data communication between the main line Hitachi electronic control system and the correction system, and use the DP network to realize data intercommunication and transmission. In actual operation, the judgment is made according to the model data in Table 1 based on the frame tension deviation value, and the value is assigned in advance through the main line operation screen, and the correction value is sent to the EMG correction system in advance for correction control. In addition, a new entry non-zero control dialog box has been added to the screen for manual operator intervention. Under normal circumstances, when weld tracking indicates that the weld of the next coil has reached the mill entry correction device, the second level can transmit a preset correction action value (derived from analysis of coil steel grade, width, and plate shape) to the first level, which then sends it to the correction device for timely action. When the weld reaches the stand, a preset leveling value is also transmitted to ensure a smooth transition. Similar adjustments are applied to downstream stands. A tensiometer monitors the strip tension in real time. When the inter-stand tension deviation (WS-DS) fluctuates positively and gradually increases, indicating that the strip is deviating toward the drive side between stands, an alarm is triggered to alert the operator. The operator can manually adjust the entry correction device offset to adjust the strip before entering the stand and gradually restore it to normal. If this deviation occurs between two stands, an alarm is also triggered. The automatic control system determines the required leveling action value based on the absolute value of the tension deviation according to the pattern in the table above. The adjacent upstream stand makes specific roll gap adjustments, gradually reducing the tension deviation and eliminating the strip deviation. If the entire coil is kept near a certain value, the deviation correction preset value and the leveling preset value are inherited to the next coil of the same specification and plan.

[0046] This method effectively prevents the problem of human operational errors and supplements and optimizes the rolling model. This not only improves the unit's yield rate and production rhythm, but also effectively controls accidents such as deviation, strip breakage, and scrap steel during the rolling process, while creating favorable conditions for smooth and high production of the unit.

[0047] The present invention also provides a rolling mill stand leveling system, comprising:

[0048] Parameter acquisition module, used to obtain leveling value, working side and transmission side tension deviation value;

[0049] A graded adjustment module, used for performing graded roll gap adjustment according to the tension deviation values ​​of the working side and the transmission side;

[0050] The parameter adjustment module is used to complete the frame leveling when the tension deviation value between the working side and the transmission side and the leveling value are within a preset range.

[0051] Preferably, the grading adjustment module includes:

[0052] The graded adjustment unit is used to adjust the leveling roller gap by 0.1mm / s when the tension deviation between the working side and the transmission side is less than 5kN;

[0053] When the tension deviation between the working side and the transmission side is greater than or equal to 5 kN and less than 10 kN, the leveling roller gap is adjusted at 0.2 mm / s;

[0054] When the tension deviation between the working side and the transmission side is greater than or equal to 10 kN, the rolling mill is slowed down to 50 m / min for 3 seconds.

[0055] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0056] The present invention completes the frame leveling process by utilizing the graded roll gap adjustment method, which not only improves the cold rolling yield rate, but also effectively controls the deviation, speed reduction, and belt breakage accidents during the rolling process.

[0057] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the description of the similarities between the various embodiments. For the methods disclosed in the embodiments, since they correspond to the devices disclosed in the embodiments, the description is relatively simple, and the relevant details can be referred to the description of the devices.

[0058] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A rolling mill stand leveling method, characterized in that: include: Obtain the leveling value, working side and transmission side tension deviation value; Perform graded roll gap adjustment according to the tension deviation values ​​of the working side and the transmission side; The step of adjusting the roller gap in grades according to the tension deviation values ​​of the working side and the transmission side includes: When the tension deviation between the working side and the transmission side is less than 5 kN, the leveling roller gap is adjusted at 0.1 mm / s; When the tension deviation between the working side and the transmission side is greater than or equal to 5 kN and less than 10 kN, the leveling roller gap is adjusted at 0.2 mm / s; When the tension deviation between the working side and the transmission side is greater than or equal to 10 kN, the rolling mill is slowed down to 50 m / min for 3 seconds; When the tension deviation value between the working side and the transmission side and the leveling value are within a preset range, the frame leveling is completed.

2. A rolling mill stand leveling system, characterized in that: include: Parameter acquisition module, used to obtain leveling value, working side and transmission side tension deviation value; A graded adjustment module, used for performing graded roll gap adjustment according to the tension deviation values ​​of the working side and the transmission side; The grading adjustment module includes: The graded adjustment unit is used to adjust the leveling roller gap by 0.1mm / s when the tension deviation between the working side and the transmission side is less than 5kN; When the tension deviation between the working side and the transmission side is greater than or equal to 5 kN and less than 10 kN, the leveling roller gap is adjusted at 0.2 mm / s; When the tension deviation between the working side and the transmission side is greater than or equal to 10 kN, the rolling mill is slowed down to 50 meters per minute; The parameter adjustment module is used to complete the frame leveling when the tension deviation value between the working side and the transmission side and the leveling value are within a preset range.

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