Disk shear raw material width abnormity identification method

Abstract

The invention provides a disc shear raw material width abnormity identification method, which comprises the following steps: calculating the time required for reducing to a target speed and the acceleration according to the maximum speed, and determining the installation position of a width gauge in combination with the field actual condition; the width gauge detects the width data of the strip steel online in real time, and the unit PLC receives the width data of the strip steel detected by the width gauge and automatically compares the width data with nominal width data of the second-level steel coil; if the width abnormal data is obtained through comparison, the unit PLC calculates the width abnormal position of the current strip steel, and a speed reduction or stopping instruction is executed at the position of the circle shear according to rule comparison. According to the technical scheme, the function of stably controlling the disc shearing edge when the width of the raw material is abnormal (narrow or ultra-wide) is achieved, the running fault rate of the disc shearing edge is reduced, meanwhile, the acid rolling trimming allowance optimization work is promoted, and the equipment achieves the optimal production efficiency and the optimal yield through the optimal function design and the most stable running.

Description

Technical Field

[0001] The invention relates to the technical field of cold-rolled strip steel production and automated control equipment in the metallurgical industry, and in particular to a method for identifying abnormal width of a circular shear raw material. Background Art

[0002] The disc shear of the cold-rolling and acid-rolling mill is mainly used to continuously cut the edge of the strip to reach the set width. At the same time, it can complete the width change in two seconds or less. When the width changes, the cut edge of the disc shear moves along a specific curve. While shearing, the disc shear frame rotates and moves around its own rotation center line. The shear blade is always completely perpendicular to the tangent direction of the shearing. The final shearing trajectory is a curve, so the width can be adjusted quickly and accurately.

[0003] With the competition in the steel industry, in order to improve the yield rate of strip steel products, it is necessary to optimize the reserved value of the rolling width of hot-rolled coils, resulting in abnormal raw material width of the pickling mill (narrow or over-wide); therefore, when the disc shear cuts to abnormal strip width, the disc shear is prone to edge blocking, flashing, knife blocking, and jamming, which seriously affects the production rhythm and yield rate of the unit. Summary of the invention

[0004] According to the technical problems raised above, the present invention provides a disc shear raw material width abnormality identification method. The present invention mainly uses a width gauge to detect the strip width data in real time online. The unit PLC obtains the real-time strip width data collected by the width gauge, and automatically compares it with the nominal width data of the secondary steel coil, automatically calculates the position where the current strip width is abnormal (narrow or over-wide), and executes the speed reduction or parking instructions at the disc shear position according to the rule comparison, thereby realizing the function of stable control of the disc shear edge when the raw material width is abnormal (narrow or over-wide), reducing the disc shear edge operation failure rate, and promoting the optimization of the pickling edge trimming allowance, so that the equipment can achieve the best production efficiency and yield rate with the best functional design and the most stable operation.

[0005] The technical means adopted by the present invention are as follows:

[0006] A method for identifying abnormal width of a disc shear raw material, comprising:

[0007] S1. Calculate the time and acceleration required to decelerate to the target speed based on the maximum speed, and determine the installation position of the width gauge based on the actual situation on site;

[0008] S2. The width gauge detects the strip width data online in real time. The unit PLC receives the strip width data detected by the width gauge and automatically compares it with the nominal width data of the secondary steel coil;

[0009] S3. If the comparison results in abnormal width data, the unit PLC calculates the position where the current strip has abnormal width, and executes a speed reduction or stop command at the disc shear position according to the rule comparison.

[0010] Furthermore, step S1 specifically includes:

[0011] S11. According to the drawings and data of the pickling mill, determine the maximum speed v in the shearing area. L ;

[0012] S12, determine the target speed v of the deceleration T ;

[0013] S13, determining the acceleration σ required to decelerate to the target speed;

[0014] S14. Calculate the required deceleration length L, the calculation formula is as follows:

[0015]

[0016] S15. According to the calculated length L of the required speed reduction and the actual situation on site, determine that the installation position of the width gauge system is L meters before the disc shear.

[0017] Further, step S2 specifically includes:

[0018] S21, record the strip width data detected by the width gauge in real time as W, and record the nominal width data of the secondary steel coil as W0;

[0019] S22, determine W<W0 or W>W0+35 as the abnormal point of strip width data, and define the continuously measured width abnormal data as W n , n=1,2,3……;

[0020] S23, define the starting point of the first segment width abnormal point data as W S1 , define the end point of the first segment width outlier data as W E1 , and define the length between the starting point and the ending point of the first segment width abnormal point data as L1;

[0021] S24, define the starting point of the second segment width abnormal point data as W S2 , define the end point of the second segment width outlier data as W E2 , and define the length between the starting point and the ending point of the second segment width abnormal point data as L2;

[0022] S25, define the starting point of the nth segment width abnormal point data as W Sn , define the end point of the nth segment width outlier data as W En, and define the length between the starting point and the end point of the nth segment width abnormal point data as L n ;

[0023] S26. When W0≤W≤W0+35, it means that this section of the area is a normal area, and the strip passes through the disc shear normally in the original way; when W<W0 or W>W0+35, it means that this section of the area is a continuous narrow or ultra-wide area.

[0024] Furthermore, when a continuous narrow gauge or extra-wide area is determined in step S26, the strip passes through the section of continuous narrow gauge or extra-wide area at the set slow threshold. When the strip passes through this section, a flashing alarm prompt of the "WIDTHNOK" label is displayed on the first-level monitoring screen. When the section of abnormal width area passes through the disc shear, the flashing stops and the normal display is restored.

[0025] Furthermore, the set slow threshold is adjusted and optimized according to actual conditions.

[0026] Further, step S3 specifically includes:

[0027] S31, when determining the abnormal width data point, remove the area of ​​a certain distance before and after the weld;

[0028] S32, the unit PLC calculates the position where the current strip steel has width abnormality, that is, calculates the strip steel length between two adjacent width abnormality areas;

[0029] S33, if the strip length between two adjacent width abnormal areas is less than or equal to the set threshold, the unit PLC will issue a speed reduction command at the disc shear position, and the strip speed increase condition limit V is less than or equal to 60m / min;

[0030] S34. If the strip length between two adjacent width abnormal areas is greater than the set threshold, the unit PLC issues a normal speed increase instruction at the disc shear position.

[0031] Furthermore, in step S31, the removed area is adjusted and optimized according to the dynamic specification requirements and actual conditions.

[0032] Further, in step S32, the strip length between two adjacent width abnormal areas is calculated as the end point W of the previous width abnormal point data. En The starting point W of the next width abnormal point data Sn+1 The distance between.

[0033] Furthermore, the thresholds set in step S33 and step S34 are adjusted and optimized according to the distance between the width gauge and the disc shear after displacement and in combination with the lifting and lowering rate.

[0034] Compared with the prior art, the present invention has the following advantages:

[0035] The present invention provides a disc shear raw material width abnormality identification method, which can reduce the disc shear edge operation failure rate, while promoting the acid rolling edge cutting margin optimization work, so that the equipment can achieve the best production efficiency and yield rate with the best functional design and the most stable operation.

[0036] Based on the above reasons, the present invention can be widely promoted in the fields of cold-rolled strip production and automatic control equipment in the metallurgical industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0038] Figure 1 The figure is a flow chart of the method of the present invention.

[0039] Figure 2 This is a diagram showing the installation position relationship of the width gauge and the circular shear equipment provided in an embodiment of the present invention.

[0040] Figure 3 This is an abnormal coil speed control diagram provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0041] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. 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 creative work should fall within the scope of protection of the present invention.

[0042] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0043] like Figure 1 As shown, the present invention provides a method for identifying abnormal width of a disc shear raw material, comprising:

[0044] S1. Calculate the time and acceleration required to decelerate to the target speed based on the maximum speed, and determine the installation position of the width gauge based on the actual situation on site;

[0045] S2. The width gauge detects the strip width data online in real time. The unit PLC receives the strip width data detected by the width gauge and automatically compares it with the nominal width data of the secondary steel coil;

[0046] S3. If the comparison results in abnormal width data, the unit PLC calculates the position where the current strip has abnormal width (narrow or over-wide), and executes a speed reduction or stop command at the disc shear position according to the rule comparison.

[0047] In specific implementation, as a preferred embodiment of the present invention, step S1 specifically includes:

[0048] S11. According to the drawings and data of the pickling mill, determine the maximum speed v in the shearing area. L In this embodiment, v L =400mpm;

[0049] S12, determine the target speed v of the deceleration T In this embodiment, v T =30mpm;

[0050] S13, determining the acceleration σ required to decelerate to the target speed. In this embodiment, σ=60 mpm / sec;

[0051] S14. Calculate the required deceleration length L, the calculation formula is as follows:

[0052]

[0053] S15, according to the calculated length L of the required speed reduction and the actual situation on site, determine the installation position of the width gauge system to be L meters before the disc shear. Figure 2 As shown, considering the convenience of later maintenance and upkeep of the width gauge system, it is determined that the installation location of the width gauge system needs to be at least 22 meters away from the disc shear, so that if the width gauge detects an abnormally wide strip, there is sufficient time to reduce the speed or stop the disc shear. In addition, there is no pressure roller at the installation location of the width gauge system, which will cause the strip to shake during the operation of the unit, resulting in inaccurate measurement of the width gauge data. It is necessary to add 2 sets of three-roll devices before and after the width gauge to ensure that the strip in the width gauge area is stable and shake-free during operation;

[0054] In specific implementation, as a preferred embodiment of the present invention, step S2 specifically includes:

[0055] S21, record the strip width data detected by the width gauge in real time as W, and record the nominal width data of the secondary steel coil as W0;

[0056] S22, determine W<W0 or W>W0+35 as the abnormal point of strip width data, and define the continuously measured width abnormal data as W n , n=1,2,3……;

[0057] S23, define the starting point of the first segment width abnormal point data as W S1 , define the end point of the first segment width outlier data as W E1 , and define the length between the starting point and the ending point of the first segment width abnormal point data as L1;

[0058] S24, define the starting point of the second segment width abnormal point data as W S2 , define the end point of the second segment width outlier data as W E2 , and define the length between the starting point and the ending point of the second segment width abnormal point data as L2;

[0059] S25, define the starting point of the nth segment width abnormal point data as W Sn , define the end point of the nth segment width outlier data as W En , and define the length between the starting point and the end point of the nth segment width abnormal point data as L n ;

[0060] S26, when W0≤W≤W0+35, it means that this section of the area is a normal area, and the strip passes through the disc shear normally in the original way; when W<W0 or W>W0+35, it means that this section of the area is a continuous narrow gauge or ultra-wide area, and the strip passes through this section of the continuous narrow gauge or ultra-wide area at the set slow threshold. When the strip passes through this section of the area, the "WIDTH NOK" label flashes on the first-level monitoring screen to alert. When the section of the abnormal width area passes through the disc shear, it stops flashing and resumes normal display. During this period, the operator is required to monitor the smoothness of the disc shearing process at all times, and stop the machine in time if an abnormality occurs.

[0061] In specific implementation, as a preferred embodiment of the present invention, the slow speed threshold is adjusted and optimized according to the actual situation. In this embodiment, the slow speed threshold is set to V=30m / min.

[0062] In specific implementation, as a preferred embodiment of the present invention, step S3 specifically includes:

[0063] S31, when determining the abnormal width data point, remove the area of ​​a certain distance before and after the weld;

[0064] S32, the unit PLC calculates the position where the current strip steel has width abnormality, that is, calculates the strip steel length between two adjacent width abnormality areas;

[0065] S33, if the strip length between two adjacent width abnormal areas is ≤ the set threshold, the unit PLC issues a speed reduction command at the disc shear position, and the strip speed increase condition is limited to V≤60m / min (the speed can be adjusted and optimized);

[0066] S34. If the strip length between two adjacent width abnormal areas is greater than the set threshold, the unit PLC issues a normal speed increase instruction at the disc shear position.

[0067] In specific implementation, as a preferred embodiment of the present invention, in step S31, the removed area is adjusted and optimized according to the dynamic variable specification requirements and actual conditions. In this embodiment, when determining the abnormal width data point, the area 3 meters before and after the weld is removed;

[0068] In specific implementation, as a preferred embodiment of the present invention, in step S32, the strip length between two adjacent width abnormal areas is calculated as the end point W of the previous width abnormal point data. En The starting point W of the next width abnormal point data Sn+1 The distance between.

[0069] In specific implementation, as a preferred embodiment of the present invention, the thresholds set in step S33 and step S34 are adjusted and optimized according to the distance between the width gauge and the disc shear after displacement and in combination with the lifting and lowering rate. In this embodiment, the threshold is set to 20 meters, that is: if the strip length between two adjacent sections of abnormal width areas is ≤20 meters, the unit PLC will issue a speed reduction instruction at the disc shear position, and the strip speed increase condition limit V≤60m / min; if the strip length between two adjacent sections of abnormal width areas is >20 meters, the unit PLC will issue a normal speed increase instruction at the disc shear position. Figure 3 Shown is the abnormal coil speed control diagram.

[0070] The device embodiments described above are merely illustrative. For example, the division of the units may be a logical function division. In actual implementation, there may be other division methods, such as multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, indirect coupling or communication connection of units or modules, which may be electrical or other forms.

[0071] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0072] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0073] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program codes.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for identifying abnormal width of a disc shear material, characterized in that: include: S1. Calculate the time and acceleration required to decelerate to the target speed based on the maximum speed, and determine the installation position of the width gauge based on the actual situation on site; S2. The width gauge detects the strip width data online in real time. The unit PLC receives the strip width data detected by the width gauge and automatically compares it with the nominal width data of the secondary steel coil; S3. If the comparison results in abnormal width data, the unit PLC calculates the position where the current strip has abnormal width, and executes a speed reduction or stop command at the disc shear position according to the rule comparison.

2. A disc shear material width abnormality identification method according to claim 1, characterized in that: Step S1 specifically includes: S11. According to the drawings and data of the pickling mill, determine the maximum speed v in the shearing area. L ; S12, determine the target speed v of the deceleration T ; S13, determining the acceleration σ required to decelerate to the target speed; S14. Calculate the required deceleration length L, the calculation formula is as follows: S15. According to the calculated length L of the required speed reduction and the actual situation on site, determine that the installation position of the width gauge system is L meters before the disc shear.

3. The method for identifying abnormal width of a circular shear material according to claim 1, characterized in that: Step S2 specifically includes: S21, record the strip width data detected by the width gauge in real time as W, and record the nominal width data of the secondary steel coil as W0; S22, determine W<W0 or W>W0+35 as the abnormal point of strip width data, and define the continuously measured width abnormal data as W n , n=1,2,3……; S23, define the starting point of the first segment width abnormal point data as W S1 , define the end point of the first segment width outlier data as W E1 , and define the length between the starting point and the ending point of the first segment width abnormal point data as L1; S24, define the starting point of the second segment width abnormal point data as W S2 , define the end point of the second segment width outlier data as W E2 , and define the length between the starting point and the ending point of the second segment width abnormal point data as L2; S25, define the starting point of the nth segment width abnormal point data as W Sn , define the end point of the nth segment width outlier data as W En , and define the length between the starting point and the end point of the nth segment width abnormal point data as L n ; S26. When W0≤W≤W0+35, it means that this section of the area is a normal area, and the strip passes through the disc shear normally in the original way; when W<W0 or W>W0+35, it means that this section of the area is a continuous narrow or ultra-wide area.

4. A disc shear material width abnormality identification method according to claim 3, characterized in that: When a continuous narrow gauge or extra-wide area is determined in step S26, the strip passes through the continuous narrow gauge or extra-wide area at the set slow threshold. When the strip passes through this area, a flashing alarm prompt of the label "WIDTH NOK" is displayed on the primary monitoring screen. When the abnormal width area passes through the disc shear, the flashing stops and the normal display is restored.

5. A method for identifying abnormal width of a circular shear material according to claim 4, characterized in that: The set slow threshold is adjusted and optimized according to actual conditions.

6. A disc shear material width abnormality identification method according to claim 1, characterized in that: Step S3 specifically includes: S31, when determining the abnormal width data point, remove the area of ​​a certain distance before and after the weld; S32, the unit PLC calculates the position where the current strip steel has width abnormality, that is, calculates the strip steel length between two adjacent width abnormality areas; S33, if the strip length between two adjacent width abnormal areas is less than or equal to the set threshold, the unit PLC will issue a speed reduction command at the disc shear position, and the strip speed increase condition limit V is less than or equal to 60m / min; S34. If the strip length between two adjacent width abnormal areas is greater than the set threshold, the unit PLC issues a normal speed increase instruction at the disc shear position.

7. A method for identifying abnormal width of a circular shear material according to claim 6, characterized in that: In step S31, the removed area is adjusted and optimized according to the dynamic specification requirements and actual conditions.

8. The method for identifying abnormal width of a circular shear material according to claim 6, characterized in that: In step S32, the strip length between two adjacent width abnormal areas is calculated as the end point W of the previous width abnormal point data. En The starting point W of the next width abnormal point data Sn+1 The distance between.

9. A method for identifying abnormal width of a circular shear material according to claim 6, characterized in that: The thresholds set in step S33 and step S34 are adjusted and optimized according to the distance between the width gauge and the disc shear after displacement and in combination with the lifting and lowering rate.

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