CN111992589B - BMD production line speed control method based on strip steel surface brightness detection - Google Patents
BMD production line speed control method based on strip steel surface brightness detection Download PDFInfo
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- CN111992589B CN111992589B CN201910444022.XA CN201910444022A CN111992589B CN 111992589 B CN111992589 B CN 111992589B CN 201910444022 A CN201910444022 A CN 201910444022A CN 111992589 B CN111992589 B CN 111992589B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
Abstract
The invention discloses a BMD production line speed control method based on strip steel surface brightness detection, which relates to the technical field of strip steel surface brightness detection, and comprises the steps of firstly obtaining the deviation of gray values and calculating an automatic control gain coefficient; and then, obtaining the adjustment quantity of the speed of the pinch roll by multiplying the gray value deviation by a control gain coefficient, and carrying out amplitude limiting on the adjustment quantity. And finally, adding the adjustment quantity after amplitude limiting with the pinch roll speed calculated last time to obtain the current pinch roll speed and simultaneously storing the current pinch roll speed. The speed control method of the BMD production line based on strip steel surface brightness detection comprehensively considers the descaling, flushing, blowing and drying functions of the BMD production line, and not only can ensure the reliability and descaling effect of an injection system, but also can ensure the production yield of the BMD production line.
Description
Technical Field
The invention relates to the technical field of strip steel surface brightness detection, in particular to a BMD production line speed control method based on strip steel surface brightness detection.
Background
The surface oxide (commonly called scale) of the metal material after hot rolling and forming is usually effectively removed before post-process treatment, which is called descaling, and the conventional chemical pickling process always has the defects of large pollution, high cost, unstable quality and the like. The technology adopts a mixed jet mode of water and abrasive particles, and realizes Descaling through continuous beating and grinding of a jet medium on the metal surface. The schematic diagram of the BMD process flow is shown in figure 1, wherein A is a mixed jet injection system, B is a medium recovery system, C is a filtering system, and D is a sand supply system. The specific BMD process flow is as follows: 1) the injection system receives two media from the filtration system and the sand supply system: water and abrasive materials are quickly mixed and emitted in the device, and are beaten and ground on a target board surface, so that scales on the target board surface are quickly removed; 2) the medium recovery system collects the descaled abrasive particles, scale powder, the crushed fine powder of the abrasive, the water body and the like together, so that water and sand separation is realized quickly, the separated dirty water body is conveyed to the filtering system, and the abrasive medium is conveyed to the sand supply system, so that the treatment and recycling of the two media are realized; 3) the filtering system rapidly picks, collects and outputs suspended matters from the dynamic water body, and simultaneously conveys the processed clean water body to each water consumption point of the injection system, thereby realizing the recycling of the water body; 4) the sand supply system carries out rapid grain selection, impurity cleaning, volume detection and dynamic supplement on the input abrasive grains, and dynamically conveys the abrasive grains to the injection system, thereby realizing the recycling of the abrasive grains.
In a dephosphorization production line based on a BMD process principle, the dephosphorization effect of an injection system is closely related to the movement speed of strip steel. If the production line speed is too high, the dephosphorization effect of the injection system is poor, and the surface brightness of the strip steel is poor; if the line speed is reduced, the productivity is reduced although the surface brightness of the strip steel is improved. Based on the situation, the speed control of the BMD production line has important significance on the dephosphorization effect of the surface of the strip steel.
Both patent CN201210165947.9 and patent 201210165950.0 adopt a continuous jet descaling system and method to realize descaling of the front and back surfaces of a cold-state metal plate strip, the front and back surfaces of the metal plate strip after jet descaling are completely free of scale residue, and the front and back surfaces can be ensured to be dry and clean through washing, blowing and drying. In the two patents, online detection is not carried out on the metal surface after dephosphorization, and parameters such as the inclination angle of a nozzle in a spraying system are determined by experience.
Patent CN201210591827.5 uses a metal surface detection device to automatically control the inclination angle of the nozzle, so as to achieve the best phosphorus removal effect. The reliability of the nozzle clamping mechanism for controlling the inclination angle is poor due to the harsh environment of the spray system. In addition, the surface cleanliness and brightness of the dephosphorized strip steel are related to not only a spraying system, but also washing, blowing and drying.
Disclosure of Invention
Technical problem to be solved
The invention provides a speed control method of a BMD production line based on strip steel surface brightness detection, which not only can ensure the reliability and the dephosphorization effect of an injection system, but also can ensure the production yield of the BMD production line.
(II) technical scheme
A BMD production line speed control method based on strip steel surface brightness detection,
the method comprises the following steps:
s1, setting the gray value G of the image with the strip steel surface brightness reaching the standardset；
S2, receiving the image gray value G provided by the strip steel surface brightness detection unit at regular intervals of a control period T (unit: second)act；
S3, calculating the gray-level value deviation Δ G, Δ G ═ Gact-Gset；
S4, calculating gain coefficient kGThe calculation formula is as follows:
wherein S isoldRepresenting the last calculated pinch roll speed, in units: m/s; k is a radical ofG0A proportionality coefficient representing the speed variation of the pinch roll and the image gray variation, unit: m/s; l represents a distance between the first row nozzle group of the ejection unit and the brightness detection unit, in units of: m;
s5, calculating the adjustment quantity delta S (unit: m/S) of the pinch roll speed according to the gray value deviation, and calculating the process: when | delta G | ≦ delta GminΔ S ═ 0.0; when | Δ G | > Δ Gmin，ΔS＝kGX Δ G, wherein Δ GminExpressing a minimum value of gray scale deviation control;
s6, limiting the adjusting quantity, when Delta S is larger than Delta Smax，ΔS＝ΔSmax(ii) a When Δ S < -. DELTA.Smax，ΔS＝-ΔSmax(ii) a Wherein, Delta SmaxRepresents the maximum adjustment, unit: m/s;
s7, calculating the current pinch roll speed Snew＝Sold+ΔS；
S8, saving the current pinch roll speed and preparing for the next pinch roll speed calculation, namely Sold＝Snew。
According to an embodiment of the present invention, a distance L between the first row nozzle group of the spraying unit and the brightness detection unit is 10 m.
According to an embodiment of the invention, the control period T is equal to 30 s.
According to the inventionIn one embodiment, the target gray-level value G is setset＝200。
According to an embodiment of the present invention, the image gray value GactThe size is 0 to 255.
According to an embodiment of the invention, the maximum adjustment Δ S of the speed of the pinch roll ismax＝0.05m/s。
According to an embodiment of the invention, the minimum value Δ G of the gray scale deviation controlmin＝2。
According to an embodiment of the invention, a proportionality coefficient k of the speed variation of the pinch roll and the image gray variationG0＝0.0025m/s。
(III) advantageous effects
By adopting the BMD production line speed control method based on strip steel surface brightness detection, firstly, the gray value deviation is obtained and the automatic control gain coefficient is calculated; and then, obtaining the adjustment quantity of the speed of the pinch roll by multiplying the gray value deviation by a control gain coefficient, and carrying out amplitude limiting on the adjustment quantity. Finally, adding the adjustment quantity after amplitude limiting with the pinch roll speed calculated last time to obtain the current pinch roll speed and simultaneously storing the current pinch roll speed; the invention comprehensively considers the descaling, flushing, blowing and drying functions of the BMD whole line, not only can ensure the reliability and descaling effect of the injection system, but also can ensure the production yield of the BMD production line.
Drawings
In the present invention, like reference numerals refer to like features throughout, wherein:
FIG. 1 is a BMD process flow diagram;
FIG. 2 is a schematic of a line layout for a BMD process;
FIG. 3(a) is a detection image with a low gray-scale value;
FIG. 3(b) is a detection image with a high gray level;
fig. 4 is a flow chart of a control method of the present invention.
Description of reference numerals:
1. an uncoiler; 2. a first steering roller; 3. an injection system; 31. a nozzle; 32. a support roller; 4. a flushing unit; 5. a purging and drying unit; 6. a pinch roll speed control unit; 7. a strip steel surface brightness detection unit; 8. a pinch roll; 9. a second turning roll; 10. and (7) a winding machine.
Detailed Description
The technical scheme of the invention is further explained by combining the drawings and the embodiment.
A speed control method of a BMD production line based on strip steel surface brightness detection guarantees that strip steel surface brightness reaches the standard by adjusting strip steel speed, and the BMD production line is arranged as shown in figure 2. The uncoiler 1 feeds the strip steel with the scale on the surface into a descaling unit through a first steering roller 2. The spraying system 3 comprises a plurality of nozzles 31 and a support roll 32, and the surface scale of the strip steel is removed by spraying a mixture of water and abrasive through the nozzles 31. The washing unit 4 removes residual powder and particles on the surface of the strip steel through high-pressure water, the blowing and drying unit 5 removes moisture on the surface of the strip steel through hot air, and the strip steel with clean and bright surface enters the winding machine 10 through the conveying of the pinch roll 8 and the second steering roll 9. In the BMD line, moisture and residual powder on the upper surface of the strip are the most difficult to remove, and they cause a reduction in the brightness of the upper surface of the strip. Therefore, a pinch roll speed control unit 6 and a strip surface brightness detection unit 7 are added in the BMD production line, and the installation positions of the pinch roll speed control unit 6 and the strip surface brightness detection unit 7 are the strip upper surface positions between the purging and drying unit 5 and the pinch roll 8. In a BMD production line, the speed of strip steel is controlled by the rotating speed of a pinch roll, and the linear speed of the pinch roll is equal to the speed of the strip steel.
Fig. 3 is a surface image of the strip steel photographed by the brightness detecting device. The surface brightness of the strip steel is characterized by the gray value of the image. FIG. 3(a) shows that the brightness of the strip steel surface is insufficient and the gray value of the image is low. FIG. 3(b) shows that the surface of the strip steel is bright and the gray value of the image is high. The image gray scale value is 0-255.
With reference to fig. 4, a BMD production line speed control method based on strip steel surface brightness detection includes the following steps:
s1, setting the gray value G of the image with the strip steel surface brightness reaching the standardset；
S2, receiving the surface of the strip steel at regular intervals of a control period T (unit: second)Image gray value G provided by brightness detection unitact；
S3, calculating the gray-level value deviation Δ G, Δ G ═ Gact-Gset；
S4, calculating gain coefficient kGThe calculation formula is as follows:
wherein S isoldRepresenting the last calculated pinch roll speed, in units: m/s; k is a radical ofG0A proportionality coefficient representing the speed variation of the pinch roll and the image gray variation, unit: m/s; l represents a distance between the first row nozzle group of the ejection unit and the brightness detection unit, in units of: m;
s5, calculating the adjustment quantity delta S (unit: m/S) of the pinch roll speed according to the gray value deviation, and calculating the process: when | delta G | ≦ delta GminΔ S ═ 0.0; when | Δ G | > Δ Gmin，ΔS＝kGX Δ G, wherein Δ GminExpressing a minimum value of gray scale deviation control;
s6, limiting the adjusting quantity, when Delta S is larger than Delta Smax，ΔS＝ΔSmax(ii) a When Δ S < -. DELTA.Smax，ΔS＝-ΔSmax(ii) a Wherein, Delta SmaxRepresents the maximum adjustment, unit: m/s;
s7, calculating the current pinch roll speed Snew＝Sold+ΔS；
S8, saving the current pinch roll speed and preparing for the next pinch roll speed calculation, namely Sold＝Snew。
To illustrate the specific manner of application of the present invention, examples of the present technique are given below. In fig. 2, the distance L between the first row nozzle group of the injection system and the brightness detection unit is 10 m. First, a target gray-scale value G is setset200, maximum adjustment Δ S of pinch roll speedmax0.05m/s, minimum value Δ G of gray scale deviation controlminAnd 2, the control period T is 30 s. By testing, the speed variation and the image gray variation of the pinch roll are testedCoefficient of proportionality kG00.0025 m/s. Under the above conditions, the following calculation is performed in accordance with the control period T.
Example 1:
s1, setting the target gray value Gset＝200；
S2, the received actual gray value Gact＝160；
S3, the gray value deviation delta G is 160-40;
s4, last calculated pinch roll speed SoldCalculate the gain factor k at 0.3m/sG
S5, calculating the speed adjustment quantity delta S of the pinch roll, wherein the delta S is 0.001125 x (-40) — 0.045;
s6, limiting the adjusting quantity, when Delta S is larger than Delta Smax，ΔS＝ΔSmax(ii) a When Δ S < -. DELTA.Smax，ΔS＝-ΔSmax(ii) a Wherein, Delta SmaxRepresents the maximum adjustment, unit: m/s;
s7, calculating the current pinch roll speed Snew＝0.3-0.045＝0.255m/s；
S8, storing the current pinch roll speed Sold＝0.255m/s。
Example 2:
s1, setting the target gray value Gset＝200；
S2, the received actual gray value Gact＝130；
S3, the gray value deviation delta G is 130-70;
s4, last calculated pinch roll speed SoldCalculating gain coefficient k as 0.25m/sG
S5, calculating the speed adjustment quantity delta S of the pinch roll, wherein the delta S is 0.0009375 x (-70) -0.065625;
s6, limiting the adjusting quantity, when Delta S is larger than Delta Smax，ΔS＝ΔSmax(ii) a When Δ S < -. DELTA.Smax，ΔS＝-ΔSmax(ii) a Wherein, Delta SmaxRepresents the maximum adjustment, unit: m/s; because the calculation result is less than-Delta SmaxAfter clipping,. DELTA.S ═ 0.05
S7, calculating the current pinch roll speed Snew＝0.25-0.05＝0.2m/s；
S8, storing the current pinch roll speed Sold＝0.2m/s。
In summary, according to the technical scheme of the invention, the BMD production line speed control method based on strip steel surface brightness detection firstly obtains the gray value deviation and calculates the automatic control gain coefficient; and then, obtaining the adjustment quantity of the speed of the pinch roll by multiplying the gray value deviation by a control gain coefficient, and carrying out amplitude limiting on the adjustment quantity. Finally, adding the adjustment quantity after amplitude limiting with the pinch roll speed calculated last time to obtain the current pinch roll speed and simultaneously storing the current pinch roll speed; the invention comprehensively considers the descaling, flushing, blowing and drying functions of the BMD whole line, not only can ensure the reliability and descaling effect of the injection system, but also can ensure the production yield of the BMD production line.
Claims (8)
1. A BMD production line speed control method based on strip steel surface brightness detection is characterized in that: the method comprises the following steps:
s1, setting the gray value G of the image with the strip steel surface brightness reaching the standardset；
S2, every predetermined control period T, unit: second, receiving the image gray value G provided by the strip steel surface brightness detection unitact；
S3, calculating the gray-level value deviation Δ G, Δ G ═ Gact-Gset；
S4, calculating gain coefficient kGThe calculation formula is as follows:
wherein S isoldRepresenting the last calculated pinch roll speed, in units: m/s; k is a radical ofG0A proportionality coefficient representing the speed variation of the pinch roll and the image gray variation, unit: m/s; l represents a distance between the first row nozzle group of the ejection unit and the brightness detection unit, in units of: m;
s5, calculating the adjustment quantity delta S of the pinch roll speed according to the gray value deviation, wherein the unit is as follows: m/s, calculation process: when | delta G | ≦ delta GminΔ S ═ 0.0; when | Δ G | > Δ Gmin，ΔS＝kGX Δ G, wherein Δ GminExpressing a minimum value of gray scale deviation control;
s6, limiting the adjusting quantity, when Delta S is larger than Delta Smax，ΔS＝ΔSmax(ii) a When Δ S < -. DELTA.Smax，ΔS＝-ΔSmax(ii) a Wherein, Delta SmaxRepresents the maximum adjustment, unit: m/s;
s7, calculating the current pinch roll speed Snew＝Sold+ΔS；
S8, saving the current pinch roll speed and preparing for the next pinch roll speed calculation, namely Sold＝Snew。
2. The BMD production line speed control method based on strip steel surface brightness detection according to claim 1, wherein a distance L between a first row of nozzle groups of the injection units and the brightness detection unit is 10 m.
3. The BMD production line speed control method based on strip steel surface brightness detection according to claim 2, wherein the control period T is equal to 30 s.
4. The BMD production line speed control method based on strip steel surface brightness detection as claimed in claim 3, wherein the gray value G of the image with the strip steel surface brightness reaching the standard is setset＝200。
5. The method as claimed in claim 1, wherein the strip steel surface brightness detection is based onThe BMD production line speed control method is characterized in that the image gray value GactThe size is 0 to 255.
6. The BMD production line speed control method based on strip steel surface brightness detection as claimed in claim 4, wherein the maximum adjustment amount Δ S of the pinch roll speedmax＝0.05m/s。
7. The BMD production line speed control method based on strip steel surface brightness detection as claimed in claim 6, wherein the minimum value Δ G of the gray scale deviation controlmin＝2。
8. The BMD production line speed control method based on strip steel surface brightness detection as claimed in claim 7, wherein a proportionality coefficient k of speed variation of the pinch roll and image gray variationG0＝0.0025m/s。
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| GB8507652D0 (en) * | 1985-03-25 | 1985-05-01 | Irex Corp | Hard copy recorders |
| CN102756002B (en) * | 2011-04-28 | 2015-08-26 | 宝山钢铁股份有限公司 | The method of the continuous de-scaling of a kind of jet |
| CN103909102B (en) * | 2012-12-31 | 2016-08-03 | 宝山钢铁股份有限公司 | The technology arrangement of a kind of jet flow cleaning and control method |
| CN203495771U (en) * | 2013-09-30 | 2014-03-26 | 杭州浙大精益机电技术工程有限公司 | Steel plate descaling device based on slurry ejection and ultrasonic guided wave combination |
| CN104647215A (en) * | 2015-01-13 | 2015-05-27 | 浙江金固股份有限公司 | Steel plate scale breaking equipment |
| CN107541737B (en) * | 2016-06-27 | 2019-07-23 | 宝山钢铁股份有限公司 | The method for improving belt steel surface pickling quality |
| CN108015124B (en) * | 2016-10-31 | 2019-06-25 | 宝山钢铁股份有限公司 | A kind of detection of band steel plate surface Residual oil and blowing method |
| CN107262538B (en) * | 2017-07-11 | 2019-09-10 | 河北科技大学 | A kind of derusting descaling process of steel band |
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