CN115870349A - Method for identifying and monitoring crease of hot rolling coiling wrapper roll - Google Patents
Method for identifying and monitoring crease of hot rolling coiling wrapper roll Download PDFInfo
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Abstract
A method for identifying and monitoring wrinkles of a hot rolling coiling wrapper roll is characterized in that a judgment chain from a reason to a result is established based on a reason dimension and a result dimension generated by the wrinkles, and the wrinkles are identified and monitored according to the judgment chain. According to the method for identifying and monitoring the wrinkles of the hot rolling coiling wrapper rollers, judgment bases are respectively searched for from two dimensions of reasons and results generated by the wrinkles, judgment chains which are simultaneously established based on the judgment bases are established according to the searched judgment bases, and accordingly the established wrinkle identification and monitoring accuracy is high, and other factors of the same dimension layer are not required to be added, so that the judgment is efficient and reliable.
Description
Technical Field
The invention belongs to the technical field of steel rolling, and particularly relates to a method for identifying and monitoring crease marks of a hot rolling coiling wrapper roll.
Background
Referring to fig. 1, the hot rolling process flow roughly includes the steps of heating, rough rolling, finish rolling, coiling, and the like. Slabs are first loaded into the walking beam furnace 1 in sequence according to a rolling schedule. After the slab has been heated to the target temperature specified in the process, it is transported to the roughing train 2. After rolling a 200-250mm plate blank into a 30-60mm intermediate blank by the rough rolling mill set, the intermediate blank enters the finishing rolling mill set through the measurement of the optimized shearing system 3. The irregular parts of the head and the tail of the strip steel are cut off by a four-link flying shear 4, then the strip steel enters a descaling box 5 for descaling, and then is rolled into finished strip steel with the thickness of 1.2-12.7mm by a finish rolling continuous mill 6 consisting of frames F1-F7. The strip steel passes through a laminar flow cooling device 7 after leaving the F7 frame, is cooled to a specified temperature, and is finally sent to a coiling machine 8 to be coiled into a steel coil.
Referring to fig. 2-1, a schematic diagram of a forming process of an inner coil of a steel coil in a coiling machine in the prior art is shown, wherein a is a coiling side guide plate; b is a valve; c is a pinch roll rear guide plate; 1 is a 1# wrapper roll; 2 is a 2# wrapper roll; 3 is a 3# wrapper roll; d, the head of the strip steel passes through a 1# wrapper roll; e, the head of the strip steel passes through a No. 2 wrapper roll; f is before the head of the strip steel passes through the 3# wrapper roll; g, the head of the strip steel passes through a 3# wrapper roll.
Referring to fig. 2-2, in the 1 st turn, when the head of the strip steel enters the 1# wrapper roll area, the 1# wrapper roll 1 is lifted up by h1 (see 31 in the figure), and after the head passes through the 1# wrapper roll 1, the 1# wrapper roll 1 is pressed down; in the 2 nd turn, when the head of the strip steel enters the 1# wrapper roll area, the 1# wrapper roll 1 is lifted by h2 (see 32 in the figure), and after the head passes through the 1# wrapper roll 1, the 1# wrapper roll 1 is pressed down; in the nth turn, when the head of the strip steel enters the 1# wrapper roll area, the 1# wrapper roll 1 lifts hn (3 n in the figure), and after the head passes through the 1# wrapper roll 1, the 1# wrapper roll 1 is pressed down. The 2# wrapper roller and the 3# wrapper roller act similar to the 1# wrapper roller.
In practical application, the 1#, 2#, 3# wrapper rolls and the winding drum are a set of coaction system, and the strip steel is tightly wound on the winding drum under the coaction of the upper and lower surface friction forces of the wrapper rolls and the winding drum. Under the influence of factors such as uneven equipment abrasion, position fluctuation, insufficient pressing force, deviation of the head of incoming strip steel and the like, a gap exists between the strip steel and a winding drum, the tightness of a winding layer is poor, the friction force between the winding drum and the strip steel is reduced, the load of the winding drum is reduced, the current of the winding drum is rapidly reduced, and the speed of the winding drum is rapidly increased; when the wrapper rollers press down and contact the strip steel, the wrapper rollers force the strip steel to be conveyed forwards through friction force, the strip steel is possibly accumulated in front of a certain wrapper roller, the contact resistance between the wrapper rollers and the strip steel is relatively increased, the difficulty of passing the strip steel through a single wrapper roller is improved, and the common problem of steel blockage is solved. After the steel is blocked, the later strip steel extrudes the strip steel forwards, the extrusion amount is gradually increased along with the increase of time, the rotation resistance of the wrapper roll is increased, the current of a motor is gradually increased to reach a set speed, and after the extrusion resistance exceeds the resistance to a certain degree, the extruded strip steel is pushed to deform and pass through the wrapper roll.
At present, the crease of the wrapper roll of the inner ring of the strip steel can only be manually detected by uncoiling detection, and the method has the following defects:
1. the detection degree is low: the crease is difficult to be found, and the crease time is not judged;
2. poor reliability: misjudgment is easy to occur, so that misblocking or missing detection is caused.
3. The potential risk is large: the problem of belt breakage is easily caused by secondary rolling without finding the crease.
The application numbers are: the invention application of 201610450519.9 discloses an "on-line determination method for folding defects of hot-rolled strip", which comprises determining actual gaps of an upper pinch roll and a lower pinch roll in pinch rolls when strip steel passes through the pinch rolls; then judging whether the actual gap is larger than a set gap or not; judging whether the clamping force of the upper pinch roll to the strip steel is greater than a set clamping force or not; if the actual gap is larger than the set gap, and the clamping force of the upper pinch roll to the strip steel is larger than the set clamping force, it is indicated that the strip steel has a folding defect, and then the position of the strip steel which is folded is recorded.
The application numbers are: the invention application 201410014360.7 discloses an automatic monitoring method for the head and the tail of a hot-rolled strip steel strip, which comprises the following steps: s11, starting a roll gap and rotating speed real-time measurement function of an inlet pinch roll and an outlet pinch roll of the dephosphorization box; step S12, judging whether the roll gap and the rotating speed of the inlet pinch roll meet first alarm conditions, if so, executing step S14, otherwise, executing step S13; step S13, judging whether the roll gap and the rotating speed of the outlet pinch roll meet second alarm conditions, if so, executing step S14, otherwise, executing step S12; and S14, outputting alarm information and stopping steel feeding.
The application numbers are: the invention application 201610067542.X discloses a method for identifying and monitoring a tail laminated plate of a hot rolling coiler, which comprises strip steel, an upper pinch roll, a lower pinch roll and a winding drum, wherein the comprehensive fluctuation conditions of pinch roll gap Hgap of the pinch roll and pinch roll motor current are monitored, when the pinch roll gap Hgap threshold is more than 1.4 times, the pinch roll motor current threshold is more than 1.9 times and the duration is more than 0ms, the phenomenon of laminated plate is judged to occur, and at the moment, a monitoring system gives an alarm to automatically seal the tail laminated plate steel coil. And (4) performing key inspection on the tail part of the steel coil by an operator, and cutting off the laminated plate part.
Disclosure of Invention
In order to solve the problems, the invention provides a method for identifying and monitoring crease marks of a hot rolling coiling wrapper roll, which has the following technical scheme:
a method for identifying and monitoring crease of a hot rolling coiling wrapper roll is characterized by comprising the following steps:
and establishing a judgment chain from the reason to the result based on the reason dimension and the result dimension generated by the crease, and establishing the identification and monitoring of the crease according to the judgment chain.
The invention discloses a method for identifying and monitoring crease of a hot rolling coiling wrapper roll, which is characterized by comprising the following steps of:
the cause dimension consists of the established monitoring of the speed and current of the reel and the respective duration.
The invention discloses a method for identifying and monitoring crease of a hot rolling coiling wrapper roll, which is characterized by comprising the following steps of:
the resulting dimension consists of the established monitoring of the wrapper roller speed and current and the respective duration.
The invention discloses a method for identifying and monitoring crease marks of a hot rolling coiling wrapper roll, which is characterized by comprising the following steps of:
when wrinkle determination based on the cause dimension and wrinkle determination based on the result dimension are simultaneously established, it is determined that wrinkles occur.
The invention discloses a method for identifying and monitoring crease of a hot rolling coiling wrapper roll, which is characterized by comprising the following steps of:
the monitoring of the speed, the current and the respective duration of the winding drum is started when the strip steel head passes through the pinch roll and ended when the wrapper roll is opened to the limit position.
The invention discloses a method for identifying and monitoring crease marks of a hot rolling coiling wrapper roll, which is characterized by comprising the following steps of:
the monitoring of the speed, current and respective duration of the wrapper rollers starts when the strip head passes through the pinch rollers and ends when the wrapper rollers are opened to the limit position.
The invention discloses a method for identifying and monitoring crease of a hot rolling coiling wrapper roll, which is characterized by comprising the following steps of:
s1: a trigger signal for monitoring the speed and the current of the winding drum by using the head of the strip steel to pass through the pinch roll as a trigger; monitoring the speed and the current of the winding drum according to the trigger signal; when the speed of the winding drum exceeds the set threshold value, the step S2 is carried out, otherwise, the monitoring is continued until the monitoring period is finished; when the current of the winding drum is monitored to be lower than a set threshold value, the step S2 is carried out, otherwise, the monitoring is continued until the monitoring period is finished;
s2: monitoring the duration of the speed of the winding drum exceeding a set threshold, entering a step S3 when the duration exceeds the set threshold, and otherwise, continuing monitoring until the monitoring period is ended; monitoring the duration of the reel current which is lower than the set threshold, entering the step S3 when the duration exceeds the set threshold, and otherwise, continuing monitoring until the monitoring period is finished;
s3: and when the duration that the reel speed exceeds the set threshold and the duration that the reel current is lower than the set threshold both exceed the set duration threshold, determining that the crease based on the cause dimension is established.
The method for identifying and monitoring the crease of the hot rolling coiling wrapper roll is characterized by comprising the following steps of:
and (4) SS1: a triggering signal for monitoring the speed and the current of the wrapper roll by taking the head of the strip steel as a trigger to penetrate through the pinch roll; monitoring the speed and current of the wrapper roll according to the trigger signal; when the speed of the wrapper roll is monitored to be lower than a set threshold value, the step SS2 is carried out, otherwise, the monitoring is continued until the monitoring period is finished; when the wrapper roller current exceeds a set threshold value, the step SS2 is carried out, otherwise, the monitoring is continued until the monitoring period is finished;
and (4) SS2: monitoring the duration of the wrapper roller speed which is lower than the set threshold, entering a step SS3 when the duration exceeds the set threshold, and otherwise, continuing monitoring until the monitoring period is finished; monitoring the duration time of the wrapper roller current exceeding a set threshold, entering a step SS3 when the duration time exceeds the set threshold, and otherwise, continuing monitoring until the monitoring period is finished;
and SS3: when both the duration in which the wrapper roller speed is lower than the set threshold and the duration in which the wrapper roller current exceeds the set threshold exceed the respective set duration thresholds, it is determined that the crease based on the result dimension is established.
The invention discloses a method for identifying and monitoring crease of a hot rolling coiling wrapper roll, which is characterized by comprising the following steps of:
the set threshold for the web speed is 1.045 times the process set speed value.
The invention discloses a method for identifying and monitoring crease marks of a hot rolling coiling wrapper roll, which is characterized by comprising the following steps of:
the set threshold value of the reel current is 0.75 times the rated current value of the process.
The invention discloses a method for identifying and monitoring crease of a hot rolling coiling wrapper roll, which is characterized by comprising the following steps of:
the set duration threshold value when the speed of the winding drum exceeds the set threshold value and the set duration threshold value when the current of the winding drum is lower than the set threshold value are both determined according to an interval [10-10000] ms; when the respective durations fall within the interval, it is determined that the respective durations exceed the set duration threshold.
The invention discloses a method for identifying and monitoring crease marks of a hot rolling coiling wrapper roll, which is characterized by comprising the following steps of:
the set threshold value of the wrapper roller speed is 0.5 times of the process set speed value.
The invention discloses a method for identifying and monitoring crease marks of a hot rolling coiling wrapper roll, which is characterized by comprising the following steps of:
the set threshold value of the wrapper roll current is 1.5 times of the process set current.
The invention discloses a method for identifying and monitoring crease marks of a hot rolling coiling wrapper roll, which is characterized by comprising the following steps of:
the set duration threshold value when the wrapper roll speed is lower than the set threshold value and the set duration threshold value when the wrapper roll current exceeds the set threshold value are determined according to an interval [10-10000] ms; when the respective durations fall within the interval, it is determined that the respective durations exceed the set duration threshold.
The invention discloses a method for identifying and monitoring crease of a hot rolling coiling wrapper roll, which is characterized by comprising the following steps of:
and when any duration exceeds 10000ms of the set threshold interval upper limit, judging abnormal production, and terminating the wrinkle judgment in the period.
According to the method for identifying and monitoring the wrinkles of the hot rolling coiling wrapper rollers, judgment bases are respectively searched for from two dimensions of reasons and results generated by the wrinkles, judgment chains which are simultaneously established based on the judgment bases are established according to the searched judgment bases, and accordingly the established wrinkle identification and monitoring accuracy is high, and other factors of the same dimension layer are not required to be added, so that the judgment is efficient and reliable; according to the monitoring and judging method, the computer system can conveniently judge the crease, calculate the crease time in real time and output alarm information, the alarm information is transmitted to the quality judging system and automatically blocked, quality judging personnel are prompted to help the inner ring of the steel coil to block the crease of the roller, and the inner ring of the steel coil needs to be opened for key confirmation; the labor intensity of personnel is reduced.
Drawings
FIG. 1 is a diagram of a production line layout in the background of the invention;
FIG. 2-1 is a schematic view of the forming process of the inner ring of the steel coil in the prior art according to the present invention;
FIG. 2-2 is a schematic view of a wrapper roller step in the prior art of the present invention;
FIG. 3 is a schematic view of a wrapper roll crease in an embodiment of the present invention;
FIG. 4 is a schematic diagram of a wrinkle monitoring and determining process according to an embodiment of the present invention;
FIG. 5 is a schematic view of the drum current under a crease alarm in an embodiment of the present invention;
FIG. 6 is a schematic diagram of wrapper roller current under a crease alarm in an embodiment of the present invention;
FIG. 7 is a schematic view of wrapper roll speed under crease warning in an embodiment of the present invention;
FIG. 8 is a schematic view of the spool speed under a crease alarm in an embodiment of the invention.
Detailed Description
The method for identifying and monitoring the wrinkle of the hot rolling coiling wrapper roll according to the invention is further specifically described in the following according to the drawings and the detailed description of the specification.
Referring to fig. 4 of the identification and monitoring method of hot rolling coiling wrapper roll crease,
and establishing a judgment chain from the reason to the result based on the reason dimension and the result dimension generated by the crease, and establishing the identification and monitoring of the crease according to the judgment chain.
Wherein the content of the first and second substances,
the cause dimension consists of the established monitoring of the speed and current of the reel and the respective duration.
Wherein the content of the first and second substances,
the resulting dimension consists of the established monitoring of the wrapper roller speed and current and the respective duration.
Wherein the content of the first and second substances,
when the wrinkle determination based on the cause dimension and the wrinkle determination based on the result dimension are simultaneously established, it is determined that a wrinkle occurs.
Wherein the content of the first and second substances,
monitoring the speed, the current and the respective duration of the winding drum from the moment when the strip steel head passes through the pinch roll to the moment when the wrapper roll is opened to the limit position; the method comprises the following steps:
s1: a trigger signal for monitoring the speed and the current of the winding drum by using the head of the strip steel to pass through the pinch roll as a trigger; monitoring the speed and the current of the winding drum according to the trigger signal; when the speed of the winding drum exceeds the set threshold value, the step S2 is carried out, otherwise, the monitoring is continued until the monitoring period is finished; when the current of the winding drum is monitored to be lower than a set threshold value, the step S2 is carried out, otherwise, the monitoring is continued until the monitoring period is finished;
s2: monitoring the duration of the speed of the winding drum exceeding a set threshold, entering a step S3 when the duration exceeds the set threshold, and otherwise, continuing monitoring until the monitoring period is ended; monitoring the duration of the reel current which is lower than the set threshold, entering the step S3 when the duration exceeds the set threshold, and otherwise, continuing monitoring until the monitoring period is finished;
s3: and when the duration that the reel speed exceeds the set threshold and the duration that the reel current is lower than the set threshold both exceed the set duration thresholds, determining that the crease based on the cause dimension is established.
Wherein, the first and the second end of the pipe are connected with each other,
monitoring the speed, the current and the respective duration of the wrapper roll from the moment when the strip steel head passes through the pinch roll to the moment when the wrapper roll is opened to the limit position; the method comprises the following steps:
SS1: a triggering signal for monitoring the speed and the current of the wrapper roll by taking the head of the strip steel as a trigger to penetrate through the pinch roll; monitoring the speed and current of the wrapper roller according to the trigger signal; when the speed of the wrapper roll is monitored to be lower than a set threshold value, the step SS2 is carried out, otherwise, the monitoring is continued until the monitoring period is finished; when the wrapper roller current exceeds a set threshold value, the step SS2 is entered, otherwise, the monitoring is continued until the monitoring period is finished;
and (4) SS2: monitoring the duration of the wrapper roller speed which is lower than the set threshold, entering a step SS3 when the duration exceeds the set threshold, and otherwise, continuing monitoring until the monitoring period is finished; monitoring the duration of the wrapper roller current exceeding the set threshold, entering a step SS3 when the duration exceeds the set threshold, and otherwise, continuing monitoring until the monitoring period is ended;
and SS3: when both the duration in which the wrapper roller speed is lower than the set threshold and the duration in which the wrapper roller current exceeds the set threshold exceed the respective set duration thresholds, it is determined that the crease based on the resulting dimension is established.
Wherein the content of the first and second substances,
the set threshold for web speed is 1.045 times the process set speed value.
Wherein, the first and the second end of the pipe are connected with each other,
the set threshold value of the reel current is 0.75 times of the rated current value of the process.
Wherein, the first and the second end of the pipe are connected with each other,
the set duration threshold value when the speed of the winding drum exceeds the set threshold value and the set duration threshold value when the current of the winding drum is lower than the set threshold value are determined according to an interval [10-10000] ms; when the respective durations fall within the interval, it is determined that the respective durations exceed the set duration threshold.
Wherein the content of the first and second substances,
the set threshold value of the wrapper roller speed is 0.5 times of the process set speed value.
Wherein the content of the first and second substances,
the set threshold value of the wrapper roll current is 1.5 times of the process set current.
Wherein the content of the first and second substances,
the set duration threshold value when the wrapper roll speed is lower than the set threshold value and the set duration threshold value when the wrapper roll current exceeds the set threshold value are determined according to an interval [10-10000] ms; when the respective durations fall within the interval, it is determined that the respective durations exceed the set duration threshold.
Wherein, the first and the second end of the pipe are connected with each other,
and when any duration exceeds 10000ms of the set threshold interval upper limit, judging that the production is abnormal, and ending the wrinkle judgment in the period.
Working process, principle and embodiment
1. Wrapper roll crease analysis
Firstly, judging the position of the strip steel, namely, finishing the condition that the head of the strip steel passes through a reeling pinch roll and a reeling wrapper roll of a reeling machine is opened to a limit position, and realizing the judgment by utilizing an electric tracking signal.
Secondly, judging the speed and the current of a winding drum, wherein before the crease of the strip steel is generated, the contact area between the winding drum and the strip steel is reduced, the friction force is reduced, the speed of the winding drum is increased, and the transmission control system can reduce the current of the winding drum to deal with the increasing speed of the winding drum, which are the reflection of the looseness of the coiled layer of the strip steel and the essential difference from the forming and winding appearance of the coiled layer of the inner ring of the head part of the normal strip steel;
judging the speed mutation of the wrapper rollers again, wherein the speed of the wrapper rollers is greatly reduced due to the increase of the actual resistance of the wrapper rollers when the wrinkle of the strip steel passes through the wrapper rollers, so that the phenomenon of locked rotor is formed; after the rotation resistance of the wrapper roller is increased, after the transmission system receives a large resistance signal, the current can be increased to ensure that the speed of the wrapper roller is quickly increased to reach a preset level. The two points are essentially different from the normal phenomenon of the normal strip steel head inner ring roll layer forming, and whether the crease is formed or not can be judged by integrating the state characteristics of the winding drum and the wrapper roll.
Then, the wrinkle time is judged, under normal conditions, short-term impact force and resistance are formed when the strip steel enters a region between a winding drum and a pinch roll, and when wrinkle defects occur, the time for the speed of a wrapper roll to suddenly drop and the current to suddenly rise is greatly prolonged, and the difference between the normal condition and the wrinkle condition can be judged through effective time.
2. Method for monitoring crease of wrapper roll
Principle of control
The winding drum is a main device for forming the strip steel coil, the motor current control principle is a constant speed principle, namely, the winding drum speed value is set according to the strip steel speed actual value transmitted by the process computer system, when the coil layers are loosened, the friction force borne by the winding drum is reduced, the winding drum speed is increased, and the winding drum motor can keep the stability of the set speed value in a current reduction mode.
The current control principle of the wrapper roller motor is a constant speed principle, namely, the speed value of the wrapper roller is set according to the actual speed value of the strip steel transmitted by the process computer system, and when the wrapper roller encounters resistance, the wrapper roller motor keeps the stability of the set speed value in a mode of increasing current.
The roll gap between the winding drum and the wrapper roll is set according to the thickness of the strip steel, and the setting principle is as follows:
roll gap Hgap = strip steel finished product thickness Hstrip + alpha PG
The alpha PG is classified according to the plate thickness, the plate width and the steel grade and stored in a digital-analog computer static table.
Under normal conditions, in order to ensure that the wrapper roll and the winding drum have the functions of clamping, conveying and winding, the winding drum and the wrapper roll keep proper friction force on the strip steel, and the currents of the motors of the winding drum and the wrapper roll are respectively maintained in a certain range. If the strip steel is slipped after being sent, the relative balance state is broken, the speed of the winding drum is increased, the current is reduced, the state of the auxiliary winding roller at the moment is changed from auxiliary winding to obstruction winding, and the loose strip steel winding layer is difficult to pass through the auxiliary winding roller. If the strip steel crease occurs, the resistance of the wrapper roll and the current of the motor are instantly and obviously changed.
Referring to FIG. 3, there is shown 21-strip, 25, 26, 27-wrapper rolls; 24-reverse resistance; 26-a reel; 29-crease; when the strip steel 21 is normally produced, the roll gap between the winding drum and the wrapper roll is relatively stable; if the strip steel generates wrinkles 29 due to the slipping of a winding drum caused by cooling, wave shape, unsmooth plate passing and the like, the resistance of the wrapper roll is also increased instantly, the speed of the wrapper roll is reduced instantly and is lower than the normally set lower limit value; meanwhile, the wrapper roller is subjected to reverse resistance 24 in the rotating direction, and the wrapper roller current is increased instantly and exceeds the upper limit value which is normally set.
Of course, the winding drum speed, the current, the wrapper roller resistance and the current can reflect the wrinkle phenomenon, but when the winding drum or the wrapper roller motor device body is abnormal, the current can be caused to be instantly higher than a normal value, or when the winding drum or the wrapper roller motor is abnormal, the speed can be lower than a normally set lower limit value. Thus, the risk of misjudgment can be systematically prevented by considering the combination of the two factors.
Therefore, the comprehensive fluctuation conditions of the speeds of the winding drum and the wrapper roll and the current of the motor are monitored, and the automatic identification of the wrinkle phenomenon can be realized.
According to the analysis of actual conditions, when the speed of a winding drum is more than 1.045 times of the set speed, and the actual value of the current of the winding drum is less than 0.75 time of the rated current value, the winding drum is in a slipping state, the band steel winding layers are seriously loosened, crease lines are easily extruded at one or more wrapper rollers, when the crease lines enter the wrapper rollers, the current value of a motor of the wrapper rollers can reach more than 1.9 times, and the actual value of the wrapper rollers can reach less than 0.5 time of the original set value. Therefore, whether the wrinkle phenomenon occurs can be judged according to the speed of the winding drum and the wrapper roll and the current condition of the motor. Note that, if the duration exceeds 10ms, it is determined that the duration exceeds the threshold (any value in the interval of 10-10000 can be regarded as a valid determination value), and a case below 10ms is considered that the system is operating normally, and a case above 10000ms is considered that the system itself is producing abnormally. According to actual experience, if the crease occurs and is not detected, a user can cause the serious influence of 100 percent of broken belts when using a crease coil to unwind, so that when the crease occurs, alarm display is carried out by the fact that the speed and the motor current exceed bearable threshold values, and automatic blocking and intercepting are carried out by a computer control system.
Decision logic
The occurrence of wrinkles was judged when the following conditions occurred simultaneously. The specific threshold value can be set according to the equipment and process characteristics of different production lines.
1) And after the crease is judged, the computer system performs alarm display and automatically uploads the crease to the quality judgment system, the system performs automatic blocking, and the operation is performed for subsequent processing.
2) Referring to fig. 4, after the head of the strip steel passes through a pinch roll, a wrapper roll crease judgment program is started, the speed of a detection winding drum is increased to be more than 1.045 times of the set speed, the current is decreased to be less than 0.75 times of the rated current value, the current and the speed of the wrapper roll are checked, the current of the wrapper roll exceeds the set value by more than 1.5 times, the duration time exceeds 10ms, and after the speed is lower than the set value by 0.5m/s, the wrapper roll crease defect is considered to occur, and system information is uploaded and automatically blocked and intercepted.
The technical scheme adopted is as follows:
1. the labor intensity of personnel is reduced: the alarm picture is highlighted, and the operation only needs to focus on observing the alarm information;
2. the reliability is high: through computer monitoring and control and manual auxiliary monitoring, misjudgment, missed judgment and untimely intervention can be avoided;
3. and (3) reducing the risk: the crease at the tail of the strip steel can be effectively detected, the system is automatically controlled, and the risk of strip breakage and accident expansion of a user are reduced.
According to the scheme implemented on the 1580 production line of the Baoshan iron and steel products Co., ltd, the specific parameters are as follows:
when rolling a certain coil of strip steel, the tail part of the strip steel is creased, and the monitoring, alarming and intercepting processes are as follows:
referring to fig. 5-8, the thickness of the finished strip steel product is 2.52mm in the step stage of the inner ring of the steel coil, after the head of the strip steel enters between the winding drum and the auxiliary winding roller, the speed of the winding drum is quickly increased to 105% of the set speed, the current of the winding drum is reduced to 49% (rated current), the inner ring is unwound, and then the current of the auxiliary winding roller motor is instantly increased to be more than 46.67A (1.6 times of the set value of 29.16A); the speed of the wrapper roller is reduced to 1m/s and is lower than a lower limit value (0.08 time of a set value of 12 m/s), the duration time exceeds 150ms, and a jump-out alarm prompt in a field first-level computer control system is given.
After the wrinkle problem is found at the tail part of the strip steel, the primary computer control system transmits the problem to the quality control judgment system, and the tail wrinkle steel coil is automatically blocked according to the convention. Arranging an operator to uncoil and check, finding that the corresponding area has crease defects, and cutting off the crease part.
According to the method for identifying and monitoring the wrinkles of the hot rolling coiling wrapper rollers, judgment bases are respectively searched for from two dimensions of reasons and results generated by the wrinkles, judgment chains which are simultaneously established based on the judgment bases are established according to the searched judgment bases, and accordingly the established wrinkle identification and monitoring accuracy is high, and other factors of the same dimension layer are not required to be added, so that the judgment is efficient and reliable; according to the monitoring and judging method, the computer system can conveniently judge the crease, calculate the crease time in real time and output alarm information, the alarm information is transmitted to the quality judging system and automatically blocked, quality judging personnel are prompted to help the inner ring of the steel coil to block the crease of the roller, and the inner ring of the steel coil needs to be opened for key confirmation; the labor intensity of personnel is reduced.
Claims (15)
1. A method for identifying and monitoring crease of a hot rolling coiling wrapper roll is characterized by comprising the following steps:
and establishing a judgment chain from the reason to the result based on the reason dimension and the result dimension generated by the wrinkle, and establishing the recognition and monitoring of the wrinkle according to the judgment chain.
2. The method for identifying and monitoring the wrinkles of the hot rolling coiling wrapper rollers as claimed in claim 1, wherein the method comprises the following steps:
the cause dimension consists of the established monitoring of the speed and current of the reel and the respective duration.
3. The method for identifying and monitoring the wrinkles of the hot rolling coiling wrapper rollers as claimed in claim 1, wherein the method comprises the following steps:
the resulting dimension consists of the established monitoring of the wrapper roller speed and current and the respective duration.
4. The method for identifying and monitoring the wrinkles of the hot rolling coiling wrapper rollers as claimed in claim 1, wherein the method comprises the following steps:
when the wrinkle determination based on the cause dimension and the wrinkle determination based on the result dimension are simultaneously established, it is determined that a wrinkle occurs.
5. The method for identifying and monitoring the creases of the hot-rolling coiling wrapper roller according to claim 2, characterized in that:
the monitoring of the speed, the current and the respective duration of the winding drum is started when the strip steel head passes through the pinch roll and ended when the wrapper roll is opened to the limit position.
6. The method for identifying and monitoring the wrinkles of the hot rolling coiling wrapper rollers as claimed in claim 3, wherein the method comprises the following steps:
the monitoring of the speed, current and respective duration of the wrapper rollers starts when the strip head passes through the pinch rollers and ends when the wrapper rollers are opened to the limit position.
7. The method for identifying and monitoring the wrinkles of the hot rolling coiling wrapper rollers as claimed in claim 5, characterized by comprising the following steps:
s1: a trigger signal for monitoring the speed and the current of the winding drum by using the head of the strip steel to pass through the pinch roll as a trigger; monitoring the speed and the current of the winding drum according to the trigger signal; when the speed of the winding drum exceeds the set threshold value, the step S2 is carried out, otherwise, the monitoring is continued until the monitoring period is finished; when the current of the winding drum is monitored to be lower than a set threshold value, the step S2 is carried out, otherwise, the monitoring is continued until the monitoring period is finished;
s2: monitoring the duration of the reel speed exceeding a set threshold, entering a step S3 when the duration exceeds the set threshold, and otherwise, continuing monitoring until the monitoring period is ended; monitoring the duration of the reel current which is lower than the set threshold, entering the step S3 when the duration exceeds the set threshold, and otherwise, continuing monitoring until the monitoring period is finished;
s3: and when the duration that the reel speed exceeds the set threshold and the duration that the reel current is lower than the set threshold both exceed the set duration threshold, determining that the crease based on the cause dimension is established.
8. The method for identifying and monitoring the wrinkles of the hot rolling coiling wrapper rollers as claimed in claim 6, characterized by comprising the following steps:
SS1: a triggering signal for monitoring the speed and the current of the wrapper roll by taking the head of the strip steel as a trigger to penetrate through the pinch roll; monitoring the speed and current of the wrapper roll according to the trigger signal; when the speed of the wrapper roll is monitored to be lower than a set threshold value, the step SS2 is entered, otherwise, the monitoring is continued until the monitoring period is finished; when the wrapper roller current exceeds a set threshold value, the step SS2 is entered, otherwise, the monitoring is continued until the monitoring period is finished;
and (4) SS2: monitoring the duration of the wrapper roller speed lower than the set threshold, entering a step SS3 when the duration exceeds the set threshold, and otherwise, continuing monitoring until the monitoring period is ended; monitoring the duration time of the wrapper roller current exceeding a set threshold, entering a step SS3 when the duration time exceeds the set threshold, and otherwise, continuing monitoring until the monitoring period is finished;
and (4) SS3: when both the duration in which the wrapper roller speed is lower than the set threshold and the duration in which the wrapper roller current exceeds the set threshold exceed the respective set duration thresholds, it is determined that the crease based on the resulting dimension is established.
9. The method for identifying and monitoring the wrinkles of the hot rolling coiling wrapper rollers as claimed in claim 7, wherein the method comprises the following steps:
the set threshold for web speed is 1.045 times the process set speed value.
10. The method for identifying and monitoring the creases of the hot-rolling coiling wrapper roller according to claim 7, wherein:
the set threshold value of the reel current is 0.75 times the rated current value of the process.
11. The method for identifying and monitoring the creases of the hot-rolling coiling wrapper roller according to claim 7, wherein:
the set duration threshold value when the speed of the winding drum exceeds the set threshold value and the set duration threshold value when the current of the winding drum is lower than the set threshold value are both determined according to an interval [10-10000] ms; when the respective durations fall within the interval, it is determined that the respective durations exceed the set duration threshold.
12. The method for identifying and monitoring the wrinkles of the hot rolling coiling wrapper rollers as claimed in claim 8, wherein the method comprises the following steps:
the set threshold value of the wrapper roller speed is 0.5 times of the process set speed value.
13. The method for identifying and monitoring the wrinkles of the hot rolling coiling wrapper rollers as claimed in claim 8, wherein the method comprises the following steps:
the set threshold value of the wrapper roll current is 1.5 times of the process set current.
14. The method for identifying and monitoring the creases of the hot-rolling coiling wrapper roller according to claim 8, wherein:
the set duration threshold value when the wrapper roll speed is lower than the set threshold value and the set duration threshold value when the wrapper roll current exceeds the set threshold value are determined according to an interval [10-10000] ms; when the respective durations fall within the interval, it is determined that the respective durations exceed the set duration threshold.
15. The method for identifying and monitoring creasing of a hot-rolled reeling wrapper roll according to claim 11 or 14, characterised in that:
and when any duration exceeds 10000ms of the set threshold interval upper limit, judging abnormal production, and terminating the wrinkle judgment in the period.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111149550.6A CN115870349A (en) | 2021-09-29 | 2021-09-29 | Method for identifying and monitoring crease of hot rolling coiling wrapper roll |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111149550.6A CN115870349A (en) | 2021-09-29 | 2021-09-29 | Method for identifying and monitoring crease of hot rolling coiling wrapper roll |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115870349A true CN115870349A (en) | 2023-03-31 |
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| CN202111149550.6A Pending CN115870349A (en) | 2021-09-29 | 2021-09-29 | Method for identifying and monitoring crease of hot rolling coiling wrapper roll |
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| Country | Link |
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| CN (1) | CN115870349A (en) |
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