CN117772816A - Periodic feedback detection method for hot rolling coiling pinch roll - Google Patents
Periodic feedback detection method for hot rolling coiling pinch roll Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 34
- 238000005098 hot rolling Methods 0.000 title claims abstract description 18
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Abstract
The invention discloses a cycle feedback detection method of a hot rolling coiling pinch roll, which comprises the following steps: s1, self-checking whether a pinch roll position sensor is normal or not, if so, entering a step S2, and if so, giving an alarm and prompting; s2, judging whether the thickness of the strip steel needs to be detected, if so, entering a step S3, and if not, giving an alarm and prompting; s3, coiling the strip steel; s4, judging whether the single jump of the roll gap of the pinch roll is larger than a threshold value, if so, giving an alarm, otherwise, entering a step S5; s5, judging whether the roll gap cycle runout of the pinch roll is larger than a threshold value, if so, giving an alarm, otherwise, entering a step S6; s6, judging whether the physical distance of the head of the steel coil is larger than a set value, if so, ending, and if not, returning to the step S4. The invention combines the periodical position change trend of the pinch roll gap feedback position sensor, thereby controlling the quality of the strip steel coil.
Description
Technical Field
The invention relates to a finished product quality control technology of a hot rolling coiling area, in particular to a cycle feedback detection method of a hot rolling coiling pinch roll.
Background
The pinch roll system of the coiling area is arranged in front of the coiling machine, and the main function of the coiling pinch roll is to control the coiling shape of the coiling machine and the tension self-adaptive adjustment of the coiling machine. The pinch rolls play an important role in the stability of the coiling of the coiler and the quality of the final hot rolled coil. The functional accuracy and stability of the pinch roll control system is particularly critical to product control in the coiling area.
In the hot rolled steel coil production process, the strip steel is coiled by a coiling machine generally, so that the production of the steel coil is completed, and in the strip steel coiling process, the production of the steel coil is completed mainly by a pinch roll, a winding drum, a coil assisting roll, a coil unloading system, a bundling machine and other equipment. The pinch roll is arranged at the entrance of the coiling machine and has the main function of introducing a strip steel coil into an entrance guide plate of the coiling machine, and applying required tension to the strip steel when the tail end of the strip steel is thrown out of the finishing mill so as to obtain a good coiling shape; by adjusting the level of the pinch roll, a good coil shape is obtained. In the field production process, the strip steel is folded in the coiling process due to the reasons of tension loss problem, biting angle deviation and the like of the pinch roll in the steel biting process in the coiling process.
In the production process of the hot rolling coiling process, although the signs of folding of the hot rolled steel coil are found, no means is provided for finding which steel coil is folded at the first time, so that the quality of the hot rolled steel coil is affected.
Due to the characteristics (high speed and batch) of hot rolled steel coil production, once the defect is generated, the serious risks such as strip breakage and the like in the production process of the subsequent working procedure are caused, and therefore, the functional precision and stability of a coiling pinch roll control system are required to be detected and evaluated.
In the prior patent application, as in Chinese patent 201410128278.7, a pressure leveling device and a control method for a hot rolling coiling pinch roll are disclosed, and belong to the technical field of hot continuous rolling control. The control method for pressure leveling of the hot rolling coiling pinch roll comprises the following steps of setting pressure judgment; judging pressure setting according to the pressure judging result; setting a pressure leveling function; setting the pressure to be increased or decreased according to the pressure setting; according to the set pressure leveling function and the pressure needing to be increased or decreased, the operating side pressure is set to be increased or decreased on the basis of the original setting; and increasing or decreasing the pressure according to the setting of the operation side pressure on the basis of the original setting, and executing pressure closed-loop control after recalculation to realize the pressure leveling function of the pinch roll.
As disclosed in Chinese patent 201610024098.3, the variable pressure control method of a hot continuous rolling thick carbon steel coiling pinch roll is applicable to carbon steel with the thickness of more than or equal to 8mm, and is characterized in that the original pressure coefficient is input when coiled strip steel is used as a head part and a body part; the tail part of the coiled strip steel is put into a variable pressure coefficient after the finish rolling end frame throws steel; the pressure coefficient k=k1+. DELTA.K, where K: variable pressure coefficient (0 < K < 1) K1: original pressure coefficient (generally 0.4); Δk: the added pressure coefficient is 0.0-0.3. The invention solves the problem of scratch of thick carbon steel caused by the upper bow of the tail part. The automatic variable pressure control of the pinch roll is realized, the product surface qualification rate is improved on the premise of ensuring good roll shape, and considerable benefits are obtained.
Both of these patents utilize the pressure control method of the take-up pinch rolls to solve the problem of improving the surface quality of the coiled steel coil. Whether the strip steel coil is folded or not is indirectly detected through the position detection of the pinch roll, so that the manual uncoiling is reduced, and the automation degree is improved.
The 2 Chinese patents are combined with a pressure control method of a coiling pinch roll to solve the problem of improving the surface quality of the coiled steel coil. Wherein, the Chinese patent 201410128278.7 mainly solves the problems of tower shape and steps of the outer ring caused by large roll gap deviation of the pinch rolls, and improves the quality of hot rolled products; chinese patent 201610024098.3 mainly solves the problem of scratch of thick carbon steel caused by upper bow of the tail.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a cycle feedback detection method for a hot rolling coiling pinch roll, which combines the cycle position change trend of a pinch roll gap feedback position sensor and the cycle threshold quantity detection and the cycle variance steady state detection method for the pinch roll gap to discriminate the state of the coiling inlet strip steel, thereby controlling the quality of the strip steel coil.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a cycle feedback detection method for a hot rolling coiling pinch roll comprises the following steps:
s1, self-checking whether a pinch roll position sensor is normal or not, if so, entering a step S2, and if so, giving an alarm and prompting;
s2, judging whether the thickness of the strip steel needs to be detected, if so, entering a step S3, and if not, giving an alarm and prompting;
s3, coiling the strip steel;
s4, judging whether the single jump of the roll gap of the pinch roll is larger than a threshold value, if so, giving an alarm, otherwise, entering a step S5;
s5, judging whether the roll gap cycle runout of the pinch roll is larger than a threshold value, if so, giving an alarm, otherwise, entering a step S6;
s6, judging whether the physical distance of the head of the steel coil is larger than a set value, if so, ending, and if not, returning to the step S4.
Preferably, in the step S1, the self-checking of the pinch roll position sensor is specifically as follows:
when x is E [ x ] 1 +α,x 2 +α]When the pinch roll position sensor is judged to be normal in self-checking;
in the above formula, x represents roll gap feedback of the pinch roll sensor, and the unit is: mm, the range value is 1.5-100 mm; x is x 1 Represents the lower limit of the roll gap of the pinch roll, unit: mm, the range value is 0-15 mm; x is x 2 Theoretical maximum roll gap opening data of the pinch roll are expressed, and the unit is: mm, the range value is 0-100 mm; alpha represents the adjustment amount of the upper and lower limits, unit: mm, the range is 0-3 mm.
Preferably, in the step S4, it is determined whether the single jump of the pinch roll is greater than a threshold value, which is specifically as follows:
the deviation change value theta obtained by subtracting the sampling data of the previous scanning period from the sampling data of the next scanning period of the pinch roll is adopted, and the deviation change value theta is used for detecting the runout of the roll gap of the pinch roll, namely:
|h n -h n-1 |＝θ
in the above formula, h represents the position data of the pinch roller in units of: mm; θ represents the position deviation change value of the interval between two scans, unit: mm;
when theta is more than or equal to max When the strip steel is judged to be folded;
when theta is as<△ max When the strip steel is judged to be unfolded;
in the above, the recipe is max A threshold value representing the fold determination.
Preferably, in the step S5, it is determined whether the roll gap cycle runout of the pinch roll is greater than a threshold value, specifically as follows:
when (when)Outputting a folding detection alarm when the folding detection alarm is in the process;
in the above, S 2 Representing a period detection stability variance value;a threshold value representing a period detection stability variance value.
Preferably, the period detection stability variance value S 2 The calculation is as follows:
in the above, h 1 、h 2 、h 3 、h 4 、h 5 、h、h 7 、h 8 、h 9 ............h n Position data representing the pinch rolls sampled for each scan cycle;representing the average feedback value of the sensor in unit time, unit: mm;
the period detects a threshold value of a stable variance valueThe calculation is as follows:
in the above formula, λ represents a coefficient of variance.
Preferably, in the step S6, the step of determining whether the physical distance of the head of the steel coil is greater than a set value specifically includes the following steps:
s61, adding head tracking judgment interlocking of the steel coil, and identifying the physical distance a of the steel coil after head tracking data are generated;
s62, increasing the thickness judgment interlock of the steel coil, wherein the thickness of the steel coil is less than 3mm;
and S63, increasing pressure interlocking of the pinch rolls.
Preferably, the alarm prompt is displayed through an HMI interface.
The cycle feedback detection method for the hot rolling coiling pinch roll provided by the invention has the following beneficial effects:
1) The invention only detects the strip steel type which is easy to fold, and reduces false detection and missing detection;
2) According to the invention, through double detection of single point and cycle runout of the pinch roll position, the accuracy of folding detection is improved;
3) According to the invention, the steel coil folding is automatically detected through the pinch roll position, so that the manual uncoiling is reduced, and the working strength of workers is reduced.
Drawings
FIG. 1 is a schematic flow chart of a method for detecting cycle feedback of a hot rolling coiling pinch roll according to the present invention.
Detailed Description
In order to better understand the above technical solution of the present invention, the technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
Referring to fig. 1, the method for detecting the cycle feedback of the hot rolling coiling pinch roll provided by the invention comprises the following steps:
s1, self-checking whether a pinch roll position sensor is normal or not, if so, entering a step S2, and if so, giving an alarm and prompting;
in the step S1, the state detection of the pinch roll cylinder position sensor related to the coiling inlet is mainly combined with the roll gap periodic feedback of the pinch roll sensor, and specifically comprises the following steps:
when x is E [ x ] 1 +α,x 2 +α]When the pinch roll position sensor is judged to be normal in self-checking;
in the above formula, x represents roll gap feedback of the pinch roll sensor, and the unit is: mm, the range value is 1.5-100 mm; x is x 1 Represents the lower limit of the roll gap of the pinch roll, unit: mm, the range value is 0-15 mm; x is x 2 Theoretical maximum roll gap opening data of the pinch roll are expressed, and the unit is: mm, the range value is 0-100 mm; alpha represents the adjustment amount of the upper and lower limits, unit: mm, the range is 0-3 mm.
S2, judging whether the thickness of the strip steel needs to be detected, if so, entering a step S3, and if not, giving an alarm and prompting;
s3, coiling the strip steel;
s4, judging whether the single jump of the roll gap of the pinch roll is larger than a threshold value, if so, giving an alarm, otherwise, entering a step S5;
in the step S4, when the self-checking of the two sensors is normal, two adjacent sampling periods of the program are used, the sampling data of the previous scanning period is subtracted from the sampling data of the next scanning period, that is, the deviation change value of each scanning interval is θ, and the change amount of θ is used to detect the jump amount of the pinch roll gap, so as to determine whether the strip steel enters the pinch roll to be folded, which is specifically as follows:
|h n -h n-1 |＝θ
in the above formula, h represents the position data of the pinch roller in units of: mm; θ represents the position deviation change value of the interval between two scans, unit: mm;
when the positions of the pinch rolls are suddenly changed to exceed a threshold value in two scanning periods, the situation that the strip steel is folded when the strip steel enters the pinch rolls is indicated. Namely:
when theta is more than or equal to max When the strip steel is judged to be folded;
when theta is as<△ max When the strip steel is judged to be unfolded;
in the above, the recipe is max A threshold value representing the fold determination.
S5, judging whether the roll gap cycle runout of the pinch roll is larger than a threshold value, if so, giving an alarm, otherwise, entering a step S6;
in the step S5, when the strip steel is folded, abnormal jump of the pinch roll position is caused, and when the jump value of the pinch roll position exceeds a threshold value, the occurrence of the folding condition is indicated. The method comprises the following steps:
setting pinch roll position data h of h sampled every scanning period of program 1 、h 2 、h 3 、h 4 、h 5 、h、h 7 、h 8 、h 9 ............h n The variance calculation formula of the samples is as follows:
in the above, h 1 、h 2 、h 3 、h 4 、h 5 、h、h 7 、h 8 、h 9 ............h n Position data representing the pinch rolls sampled for each scan cycle;representing the average feedback value of the sensor in unit time, unit: mm;
although the variance S 2 The smaller the sensor variation, the more stable, but due to jitter and other reasons of the system itself, the embodimentThe value range is 1.5-3.5 mm, and when +.>When the value is 1.5mm, the maximum variance S is the maximum variance 2 2.25. For the purpose of further stability, a variance factor λ is set up here, which takes on a value of 0.8 (according to the system stability, the smaller the value the smaller the threshold value the smaller the detectionThe more sensitive but prone to false detection. The larger the value, the opposite is true, and the omission is liable to occur. The value range is generally 0.5-1). Thus, the threshold value of the periodic detection stability variance value +.>The calculation is as follows:
in the above formula, λ represents a variance coefficient;
in this embodiment, the scan period of the PLC is 50ms, so n is 20, i.e., the variance is calculated within 1 second;
when (when)Outputting a fold detection alarm at the same time, in this embodiment +.>And detecting and judging that the folding is detected.
S6, judging whether the physical distance of the head of the steel coil is larger than a set value, if so, ending, otherwise, returning to the step S4;
because the steel coil is coiled in the process, the conditions of the strip steel position, the strip steel thickness, the pinch roll pressure and the like are changed, in the step S6, the step of judging whether the physical distance of the head of the steel coil is larger than a set value comprises the following steps:
s61, adding head tracking judgment interlocking of the steel coil, and identifying the physical distance a of the steel coil after head tracking data are generated;
s62, increasing thickness judgment interlocking of the steel coil, wherein the steel coil is set to be smaller than 3mm in thickness for detection precision and reliability because the steel coil is high in detection precision and reliability due to the fact that once the steel coil is folded, the steel coil is in tension losing problem, biting angle deviation and the like; the incoming materials with the diameters larger than 3mm are not detected and judged;
s63, increasing the pressure interlocking of the pinch rolls, and normally, when the pinch rolls are put into pressure (15-50 KN) control, the pressure control signal is used as necessary interlocking control due to the reasons of tension losing problem, biting angle deviation and the like.
The invention provides a warning prompt in a hot rolling coiling pinch roll period feedback detection method, which is used for transmitting a script triggered to an HMI by a trigger detection signal and increasing warning pop-up boxes of the HMI.
Example 1
The thickness of the rolled product in this example 1 is 2.8mm, the coil number is 121034852100, when the rolled product is rolled to the coil, the head of the strip steel is creased, and the data collected by the pinch roll position sensor within one second of the head are respectively:
the maximum jitter amplitude of the system in this case is 3mm, so delta max The value is 3mm.When the value is 1.5mm, the maximum variance S is the maximum variance 2 Lambda takes a value of 0.8 and is 2.25 according to the formula +.>
1) According to the formula
|h n -h n-1 The maximum value of I is 2.8, which is less than delta max
And judging that the single jump of the roll gap of the pinch roll is smaller than a threshold value.
2) According to the formula
Obtaining S 2 = 3.144, greater than
Therefore, the roll gap periodic runout of the pinch roll is judged to be larger than a threshold value, and an alarm is sent out.
Example 2
The thickness of the rolled product in this example 2 was 2.0mm, the coil number was 121021456500, the head of the strip was creased when rolled to the coil, and the data collected by the pinch roll position sensor within one second of the head were:
1) According to the formula
|h n -h n-1 The maximum value of I is 4.4, which is greater than delta max
And judging that the single jump of the roll gap of the pinch roll is larger than a threshold value, and giving an alarm.
2) According to the formula
Obtaining S 2 =1.27, greater than
Therefore, the roll gap cycle runout of the pinch roll is judged to be smaller than a threshold value.
It will be appreciated by persons skilled in the art that the above embodiments are provided for illustration only and not for limitation of the invention, and that variations and modifications of the above described embodiments are intended to fall within the scope of the claims of the invention as long as they fall within the true spirit of the invention.
Claims (7)
1. The cycle feedback detection method of the hot rolling coiling pinch roll is characterized by comprising the following steps of:
s1, self-checking whether a pinch roll position sensor is normal or not, if so, entering a step S2, and if so, giving an alarm and prompting;
s2, judging whether the thickness of the strip steel needs to be detected, if so, entering a step S3, and if not, giving an alarm and prompting;
s3, coiling the strip steel;
s4, judging whether the single jump of the roll gap of the pinch roll is larger than a threshold value, if so, giving an alarm, otherwise, entering a step S5;
s5, judging whether the roll gap cycle runout of the pinch roll is larger than a threshold value, if so, giving an alarm, otherwise, entering a step S6;
s6, judging whether the physical distance of the head of the steel coil is larger than a set value, if so, ending, and if not, returning to the step S4.
2. The method for detecting the periodic feedback of the hot-rolled coiling pinch rolls according to claim 1, wherein in the step S1, the self-detection of the pinch roll position sensor is specifically as follows:
when x is E [ x ] 1 +α,x 2 +α]When the pinch roll position sensor is judged to be normal in self-checking;
in the above formula, x represents roll gap feedback of the pinch roll sensor, and the unit is: mm, the range value is 1.5-100 mm; x is x 1 Represents the lower limit of the roll gap of the pinch roll, unit: mm, the range value is 0-15 mm; x is x 2 Theoretical maximum roll gap opening data of the pinch roll are expressed, and the unit is: mm, the range value is 0-100 mm; alpha represents the adjustment amount of the upper and lower limits, unit: mm, the range is 0-3 mm.
3. The method for detecting the cycle feedback of the hot rolling coiling pinch roll according to claim 1, wherein in the step S4, it is determined whether the single jump of the pinch roll is greater than a threshold value as follows:
the deviation change value theta obtained by subtracting the sampling data of the previous scanning period from the sampling data of the next scanning period of the pinch roll is adopted, and the deviation change value theta is used for detecting the runout of the roll gap of the pinch roll, namely:
|h n -h n-1 |＝θ
in the above formula, h represents the position data of the pinch roller in units of: mm; θ represents the position deviation change value of the interval between two scans, unit: mm;
when theta is more than or equal to max When the strip steel is judged to be folded;
when theta is as<△ max When the strip steel is judged to be unfolded;
in the above, the recipe is max A threshold value representing the fold determination.
4. The method for detecting cycle feedback of hot rolling and coiling pinch rolls according to claim 3, wherein in the step S5, it is determined whether the cycle runout of the pinch rolls is greater than a threshold value, specifically as follows:
when (when)Outputting a folding detection alarm when the folding detection alarm is in the process;
in the above, S 2 Representing a period detection stability variance value;a threshold value representing a period detection stability variance value.
5. The method for detecting cycle feedback of hot-rolled coiling pinch rolls as recited in claim 4, wherein said cycle detects a stable variance value S 2 The calculation is as follows:
in the above, h 1 、h 2 、h 3 、h 4 、h 5 、h、h 7 、h 8 、h 9 ............h n Position data representing the pinch rolls sampled for each scan cycle;representing the average feedback value of the sensor in unit time, unit: mm;
the period detects a threshold value of a stable variance valueThe calculation is as follows:
in the above formula, λ represents a coefficient of variance.
6. The method for detecting the periodic feedback of the hot-rolled coiling pinch rolls according to claim 1, wherein in the step S6, the step of judging whether the physical distance of the head of the steel coil is greater than a set value comprises the following steps:
s61, adding head tracking judgment interlocking of the steel coil, and identifying the physical distance a of the steel coil after head tracking data are generated;
s62, increasing the thickness judgment interlock of the steel coil, wherein the thickness of the steel coil is less than 3mm;
and S63, increasing pressure interlocking of the pinch rolls.
7. The hot rolling coiling pinch roll periodic feedback detection method according to claim 1, characterized in that: the alarm prompt is displayed through an HMI interface.
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| CN202211149814.2A CN117772816A (en) | 2022-09-21 | 2022-09-21 | Periodic feedback detection method for hot rolling coiling pinch roll |
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| CN202211149814.2A CN117772816A (en) | 2022-09-21 | 2022-09-21 | Periodic feedback detection method for hot rolling coiling pinch roll |
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