A method for measuring the reduction of a dynamic load work roll of a straightening machine

Abstract

This application provides a method for measuring the dynamic, loaded reduction of the work rolls in a straightening machine, relating to the technical field of steel coil cross-cutting production equipment. The method includes solder bars, solder bar placement methods, a method for reducing the roll gap in a straightening machine, and a method for measuring solder bar deformation. This application provides a method for measuring the dynamic, loaded reduction of the work rolls in a straightening machine. By reasonably setting the placement position, dimensional parameters, and roll gap reduction process of the solder bars, it can accurately reflect the actual reduction of the work rolls under different specifications of strip steel and different equipment conditions. Combined with the deviation between the measured value and the set value, it can promptly correct the reduction accuracy of the straightening machine, effectively improve strip shape defects, enhance the production quality and efficiency of the steel coil cross-cutting line, and reduce equipment debugging and maintenance costs. It can realize the measurement of the actual reduction of the straightening machine's work rolls under dynamic loading conditions. By comparing the difference between the set reduction and the actual reduction, the set work roll reduction of the straightening machine can be optimized.

Description

Technical Field

[0001] This application relates to the technical field of steel coil cross-cutting line production equipment, and in particular to a method for measuring the dynamic on-load work roll reduction of a straightening machine. Background Technology

[0002] A straightening machine is a crucial piece of equipment in the steel coil cross-cutting production process, straightening steel coils into steel plates with the required flatness. It comprises an upper work roll, an upper support roll, a lower work roll, and a lower support roll. The upper work roll and upper support roll are integrated into an upper roll box, while the lower work roll and lower support roll are integrated into a lower roll box. During production, the pressure applied by the upper work rolls varies depending on the strength, thickness, and width of the strip. The amount the upper work rolls are pushed open due to the elastic rebound of the steel plate also varies, ultimately leading to a discrepancy between the actual pressure applied by the upper work rolls and the set value. Furthermore, with accumulated use, the work rolls wear down, reducing the equipment's accuracy and further increasing the deviation between the set and actual pressure applied by the upper work rolls. Currently, the pressure applied by the upper work rolls of a straightening machine is mainly displayed through a downward pressure cylinder or a gear and rack mechanism. However, both of these pressure measurement values ​​are affected by the gaps in connecting parts or bearing housings, failing to accurately reflect the actual pressure applied by the upper work rolls. Summary of the Invention

[0003] This application is made in view of the above-mentioned problems, and its purpose is to provide a method for measuring the dynamic loaded work roll reduction of a straightening machine, so as to solve the problems mentioned in the background art. To achieve the above objectives, the present invention provides the following technical solution: a method for measuring the pressing amount of a working roll in a straightening machine under dynamic loading, comprising a solder bar, a solder bar placement method, a method for pressing down the gap between the straightening machine rolls, and a method for measuring the deformation of the solder bar. The actual pressing amount of the working roll of the straightening machine is directly obtained by measuring the bending deformation of the solder bar under dynamic loading, avoiding the influence of the gap between the equipment connecting parts and the bearing seat on the measurement accuracy, and realizing accurate measurement of the pressing amount of the working roll under dynamic loading.

[0004] Furthermore, the tin bar is a strip of high-purity tin metal, and the size of the tin bar matches the size of the straightening machine and the thickness of the strip. The thickness of the tin bar is not less than the thickness of the strip. When the diameter of the working roller of the straightening machine is 180mm and the gap between the working rollers is 25mm, the length of the tin bar is 350mm and the width is 20mm. When the thickness of the strip is 7.5mm, the thickness of the tin bar is 8mm.

[0005] Furthermore, the method of placing the solder bar is to place the solder bar on the lower working roller of the straightening machine according to the structure of the straightening machine to be tested, with the solder bar close to the edge of the strip to be straightened.

[0006] Furthermore, the solder bar is placed without contacting the strip steel, and is placed on the operating side and transmission side of the straightener's inlet and outlet respectively, to ensure that the deformation of the solder bar is consistent with the deformation of the adjacent strip steel.

[0007] Furthermore, the number of tin bars is four, which are marked and placed on the inlet operation side, outlet operation side, inlet transmission side and outlet transmission side respectively.

[0008] Furthermore, the method for pressing down the roll gap of the straightening machine includes the following steps: First, with the working roller of the straightener not rotating, set the working roller pressing amount according to the thickness, strength and width of the strip. The working roller presses down according to the set pressing amount and remains fixed, so that the strip and the solder bar bend and deform at the same time. Then, control the working roller of the straightener to rotate, so that the strip and the solder bar can run a preset distance along the straightening direction.

[0009] Furthermore, the preset distance is determined based on the straightener specifications and strip parameters to ensure that the tin bar can fully reflect the pressing down of the work roll under dynamic loading conditions.

[0010] Furthermore, the preset distance is 100mm, and the strip parameters include strip material, width and thickness. When the strip material is Q235B, the width is 2000mm and the thickness is 7.5mm. The inlet working roll reduction is set to 5mm and the outlet reduction is 1mm.

[0011] Furthermore, the method for measuring the deformation of the solder bar involves running the strip and the solder bar a preset distance along the straightening direction, then raising the upper roller box of the straightening machine, taking out the solder bar and placing it on a flat plate, and measuring the maximum value of the solder bar bending amount. This maximum value is the actual amount of pressure applied by the working roller under the dynamic loaded state of the straightening machine.

[0012] Furthermore, after the strip steel and solder bars have traveled a preset distance of 100mm along the straightening direction, the upper roller box is lifted, the solder bars are removed, placed on a flat plate, and the maximum bending value of each solder bar is measured with a ruler. On the first inlet operating side of the solder bar: h1=4.9mm, the actual pressing amount is 0.1mm smaller than the set value of 5mm; Solder bar outlet operating side: h2=0.9mm, the actual pressing amount is 0.1mm smaller than the set value of 1mm; On the three-inlet drive side of the solder bar: h3=4.8mm, the actual pressing amount is 0.2mm smaller than the set value of 5mm; For the fourth outlet drive side of the tin bar: h4=0.8mm, the actual pressing amount is 0.2mm smaller than the set value of 1mm. When the deviation between the measured pressing amount and the set pressing amount is ≤0.5mm, the pressing accuracy of the straightening machine is considered to meet the requirements. If the deviation exceeds 0.5mm, the pressing accuracy of the straightening machine needs to be corrected to ensure the straightening effect.

[0013] Compared with existing technologies, this invention has the following advantages: By utilizing the non-springback deformation characteristics of high-purity tin bars, direct measurement of the actual reduction of the working roll under dynamic loading conditions is achieved. This effectively avoids measurement deviations caused by gaps in connecting components and bearing seats in the detection methods of pressing cylinders and gear rack mechanisms, significantly improving the accuracy of reduction measurement. This provides reliable data support for optimizing the reduction parameters of the straightening machine. Furthermore, no complex modifications to the straightening machine are required. By rationally setting the placement position, size parameters, and roll gap reduction process of the tin bars, the actual reduction of the working roll under different specifications of strip steel and different equipment conditions can be accurately reflected. Combined with the deviation judgment between the measured value and the set value, the reduction accuracy of the straightening machine can be corrected in a timely manner, effectively improving strip shape defects, enhancing the production quality and efficiency of the steel coil cross-cutting line, and reducing equipment debugging and maintenance costs. It can achieve the measurement of the actual reduction of the straightening machine's working roll under dynamic loading conditions. By comparing the difference between the set reduction and the actual reduction, the set working roll reduction of the straightening machine can be optimized, improving the straightening machine's effect on improving strip shape defects. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this drawing or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this drawing. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of the straightener roller gap in the open state according to the present invention; Figure 2 This is a schematic diagram of the distribution structure of the tin bar and strip steel with respect to the lower work roll in this invention; Figure 3 This is a schematic diagram of the working roller of the straightening machine of the present invention in the pressed-down state. Figure 4 This is a schematic diagram of the tin bar bending measurement structure of the present invention.

[0016] The purpose, features, and advantages of this accompanying drawing will be further explained in conjunction with the embodiments and with reference to the accompanying drawing. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this application clearer, the following description and illustration are provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. All other embodiments obtained by those skilled in the art based on the embodiments provided in this application without inventive effort are within the scope of protection of this application.

[0018] Obviously, the following description is merely some examples or embodiments of this application. Those skilled in the art can apply this application to other similar scenarios without any inventive effort. Furthermore, it is understood that although the effort involved in such development may be complex and lengthy, for those skilled in the art related to the content disclosed in this application, any changes to design, manufacturing, or production based on the technical content disclosed in this application are merely conventional technical means and should not be construed as insufficient disclosure of the content of this application.

[0019] Unless otherwise specified, the terms "comprising" and "including" as used in this application can be open-ended or closed-ended. For example, "comprising" and "including" can mean that other components not listed may also be included, or that only the listed components may be included.

[0020] Unless otherwise specified, the term "or" is inclusive in this application. For example, the phrase "A or B" means "A, B, or both A and B". More specifically, the condition "A or B" is satisfied by any of the following conditions: A is true or exists and B is false or does not exist; A is false or does not exist and B is true or exists; or both A and B are true or exist.

[0021] Terminology explanation: such as Figures 1 to 4As shown, this includes solder bars, solder bar placement methods, straightener roll gap pressing methods, and solder bar deformation measurement methods. The actual pressing amount of the straightener's working roll is directly obtained by measuring the bending deformation of the solder bar under dynamic loading conditions. This avoids the influence of equipment connection parts and bearing housing clearances on measurement accuracy, achieving precise measurement of the working roll pressing amount under dynamic loading conditions. The solder bar is made of high-purity tin metal with a purity of not less than 99.9%. Its material properties must meet the requirements of no significant residual plastic deformation and low deformation recovery, ensuring that the bending shape of the solder bar after measurement can stably retain the true deformation under dynamic loading, avoiding measurement errors caused by material issues. The size of the solder bar matches the size of the straightener and the strip thickness, and the solder bar thickness is not less than the strip thickness. When the straightener's working roll diameter is 180mm and the working roll gap is 25mm, the solder bar length is 3... When the strip thickness is 7.5mm and the width is 20mm, the solder bar thickness is 8mm. The solder bar placement method is to place the solder bar on the lower working roller of the straightening machine according to the structure of the straightening machine to be tested, with the solder bar close to the edge of the strip to be straightened. The solder bar should not contact the strip when placed, and it should be placed on the operating side and drive side of the straightening machine at the inlet and outlet to ensure that the deformation of the solder bar is consistent with the deformation of the adjacent strip. Before placement, the oxide scale, oil stains and debris on the surface of the lower working roller should be cleaned to avoid impurities causing the solder bar to be placed off-center or unevenly stressed. At the same time, the position of the solder bar should be fixed with positioning fixtures to prevent the solder bar from sliding when the working roller rotates, further ensuring the consistency of the deformation of the solder bar and the strip. There are four solder bars, which are marked and placed on the inlet operating side, outlet operating side, inlet drive side and outlet drive side respectively. The method for pressing down the roll gap of a straightening machine includes the following steps: First, with the straightener's work rolls stationary, set the work roll compression amount based on the strip's thickness, strength, and width. The work rolls then compress according to the set amount and remain fixed, causing both the strip and solder bar to bend and deform simultaneously. Next, control the straightener's work rolls to rotate, driving the strip and solder bar along the straightening direction a preset distance. The preset distance is determined based on the straightener specifications and strip parameters, ensuring the solder bar fully reflects the compression of the work rolls under dynamic loading. The preset distance is 100mm. During operation, the work roll speed and strip speed must be monitored in real time to maintain the correct rotation speed. To ensure stability and prevent abnormal deformation of the solder bars due to speed fluctuations, the condition of the solder bars should be observed to prevent breakage or detachment, ensuring a smooth measurement process. Strip parameters include material, width, and thickness. When the strip material is Q235B, the width is 2000mm and the thickness is 7.5mm. The inlet work roller's reduction is set to 5mm and the outlet to 1mm. After the strip and solder bars have traveled a preset distance of 100mm along the straightening direction, the upper roller box is raised, the solder bars are removed, and placed on a flat plate. The maximum bending value of each solder bar is measured using a ruler. On the first inlet operating side of the solder bar: h1=4.9mm, the actual pressing amount is 0.1mm smaller than the set value of 5mm; Solder bar outlet operating side: h2=0.9mm, the actual pressing amount is 0.1mm smaller than the set value of 1mm; On the three-inlet drive side of the solder bar: h3=4.8mm, the actual pressing amount is 0.2mm smaller than the set value of 5mm; For the fourth outlet drive side of the solder bar: h4=0.8mm, the actual pressing amount is 0.2mm smaller than the set value of 1mm. The main reasons for the deviation are the slight elastic deformation of the connecting parts of the equipment and the slight displacement of the bearing seat clearance. This deviation is within the allowable range, indicating that the pressing accuracy of the straightener meets the requirements. When the deviation between the measured pressing amount and the set pressing amount is ≤0.5mm, the pressing accuracy of the straightener is considered to meet the requirements. If the deviation exceeds 0.5mm, the pressing accuracy of the straightener needs to be corrected to ensure the straightening effect. The method for measuring the deformation of the solder bar is as follows: after the strip steel and solder bar have run a preset distance along the straightening direction, the upper roller box of the straightener is raised, the solder bar is taken out and placed on the plate, and the maximum value of the bending amount of the solder bar is measured. This maximum value is the actual pressing amount of the working roller under the dynamic loaded state of the straightener. During the measurement, it is necessary to ensure that the ruler is perpendicular to the plate. The measurement point is selected at the point where the bending of the solder bar is most obvious. Each solder bar is measured three times, and the average value is taken as the final measurement result to reduce human measurement error and further improve the measurement accuracy.

[0022] In summary, based on the straightener specifications such as the working roll diameter, roll gap, and the thickness and material of the strip to be straightened, high-purity solder bars of matching dimensions are customized with a thickness not less than that of the strip. Four solder bars are placed on the lower working roll at four key locations: inlet, outlet, operating side, and drive side, with no contact between them and the strip edge. This arrangement ensures that the stress environment of the solder bars within the roll gap is completely consistent with that of the strip. The static pressing and dynamic loading straightener is operated according to set parameters, such as an inlet of 5mm and an outlet of 1mm. First, the working roll is kept stationary while the upper roller box is pressed down, causing the solder bars and strip to bend synchronously under static pressure. Then, the working roll is controlled to rotate, driving the solder bars and strip to travel a preset distance, such as 100mm, along the straightening direction. This process is completely replicated. The dynamic loaded production condition ensures that the deformation of the solder bar truly reflects the effective reduction of the work roll under actual rolling pressure. After the strip and solder bar have traveled to a specified distance, the upper roller box is lifted to remove the solder bar, which is then placed flat on a plate. Since the solder bar does not spring back after being compressed, its bending shape will be permanently preserved. The maximum value of the solder bar bending is measured with a ruler, and this value is the actual reduction of the work roll under the dynamic loaded state of the straightener. If the deviation is within the allowable range, such as ≤0.5mm, the equipment accuracy is deemed qualified. If the deviation exceeds the limit, the pressing system is precisely calibrated based on multi-position measured data, ultimately optimizing the working roll pressing parameters, eliminating plate shape defects caused by wear or springback, and improving the flatness of the steel plate.

[0023] It should be noted that this application is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and effect as the technical concept within the scope of this application are included in the technical scope of this application. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of this application, are also included in the scope of this application.

Claims

1. A method for measuring the reduction of a dynamic loaded work roll in a straightening machine, characterized in that, This includes solder bars, solder bar placement methods, straightener roll gap pressing methods, and solder bar deformation measurement methods. By directly obtaining the actual pressing amount of the straightener work roll through the bending deformation of the solder bar under dynamic loading, the measurement accuracy is avoided by avoiding the influence of equipment connecting parts and bearing seat gaps. This enables accurate measurement of the pressing amount of the work roll under dynamic loading.

2. The method for measuring the dynamic loaded work roll reduction of a straightening machine according to claim 1, characterized in that, The tin bar is a strip of high-purity tin metal. The size of the tin bar is matched with the size of the straightening machine and the thickness of the strip. The thickness of the tin bar is not less than the thickness of the strip. When the diameter of the working roll of the straightening machine is 180mm and the gap between the working rolls is 25mm, the length of the tin bar is 350mm and the width is 20mm. When the thickness of the strip is 7.5mm, the thickness of the tin bar is 8mm.

3. The method for measuring the dynamic loaded work roll reduction of a straightening machine according to claim 1, characterized in that, The method of placing the solder bar is to place the solder bar on the lower working roller of the straightening machine according to the structure of the straightening machine to be tested, with the solder bar close to the edge of the strip to be straightened.

4. The method for measuring the dynamic loaded work roll reduction of a straightening machine according to claim 3, characterized in that, The solder bar is placed without contacting the strip steel, and is placed on the operating side and transmission side of the straightening machine inlet and outlet respectively, to ensure that the deformation of the solder bar is consistent with the deformation of the adjacent strip steel.

5. The method for measuring the dynamic loaded work roll reduction of a straightening machine according to claim 4, characterized in that, The number of tin bars is four, which are marked and placed on the inlet operation side, outlet operation side, inlet transmission side and outlet transmission side respectively.

6. The method for measuring the dynamic loaded work roll reduction of a straightening machine according to claim 1, characterized in that, The method for pressing down the roller gap of the straightening machine includes the following steps: First, with the working roller of the straightener not rotating, set the working roller pressing amount according to the thickness, strength and width of the strip. The working roller presses down according to the set pressing amount and remains fixed, so that the strip and the solder bar bend and deform at the same time. Then, control the working roller of the straightener to rotate, so that the strip and the solder bar can run a preset distance along the straightening direction.

7. The method for measuring the dynamic loaded work roll reduction of a straightening machine according to claim 6, characterized in that, The preset distance is determined based on the straightener specifications and strip parameters to ensure that the tin bar can fully reflect the pressing down of the work roll under dynamic loading conditions.

8. The method for measuring the dynamic loaded work roll reduction of a straightening machine according to claim 7, characterized in that, The preset distance is 100mm. The strip parameters include strip material, width and thickness. When the strip material is Q235B, the width is 2000mm and the thickness is 7.5mm. The inlet working roll reduction is set to 5mm and the outlet reduction is 1mm.

9. The method for measuring the dynamic loaded work roll reduction of a straightening machine according to claim 1, characterized in that, The method for measuring the deformation of the solder bar involves running the strip and the solder bar a preset distance along the straightening direction, then raising the upper roller box of the straightening machine, taking out the solder bar and placing it on a flat plate, and measuring the maximum value of the solder bar bending amount. This maximum value is the actual amount of pressure applied by the working roller under the dynamic loaded state of the straightening machine.

10. A method for measuring the dynamic loaded work roll reduction of a straightening machine according to claim 8, characterized in that, After the strip steel and solder bars have traveled a preset distance of 100mm along the straightening direction, the upper roller box is lifted, the solder bars are removed, placed on a flat plate, and the maximum bending value of each solder bar is measured with a ruler. On the first inlet operating side of the solder bar: h1=4.9mm, the actual pressing amount is 0.1mm smaller than the set value of 5mm; Solder bar outlet operating side: h2=0.9mm, the actual pressing amount is 0.1mm smaller than the set value of 1mm; On the three-inlet drive side of the solder bar: h3=4.8mm, the actual pressing amount is 0.2mm smaller than the set value of 5mm; For the fourth outlet drive side of the tin bar: h4=0.8mm, the actual pressing amount is 0.2mm smaller than the set value of 1mm. When the deviation between the measured pressing amount and the set pressing amount is ≤0.5mm, the pressing accuracy of the straightening machine is considered to meet the requirements. If the deviation exceeds 0.5mm, the pressing accuracy of the straightening machine needs to be corrected to ensure the straightening effect.

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