A method for identification and monitoring of wrinkles on a hot rolling coiling roll

Abstract

A method for identifying and monitoring wrinkles on hot-rolled coiling aid rolls is disclosed. This method establishes a judgment chain from cause to effect based on the cause and effect dimensions of wrinkle formation, and uses this judgment chain to establish wrinkle identification and monitoring. The method identifies and monitors wrinkles on hot-rolled coiling aid rolls by finding judgment criteria from both the cause and effect dimensions of wrinkle formation, and establishes a judgment chain based on the simultaneous validity of these criteria. The wrinkle identification and monitoring established in this way has high accuracy and does not require the addition of other factors at the same dimension layer, making the identification efficient and reliable.

Description

Technical Field

[0001] This invention belongs to the field of steel rolling technology, specifically relating to a method for identifying and monitoring wrinkles on hot rolling coiling aid rolls. Background Technology

[0002] Reference Figure 1 The hot rolling process generally includes heating, roughing, finishing, and coiling. First, according to the rolling plan, the slab is sequentially loaded into the walking beam furnace 1. After being heated to the target temperature specified by the process, the slab is transported to the roughing mill 2. The roughing mill rolls the 200-250mm slab into an intermediate slab of 30-60mm, which then enters the finishing mill 3 via the optimized shearing system 3. The slab first passes through a four-bar flying shear 4 to remove irregular ends, then enters the descaling box 5 for descaling, and finally passes through the finishing continuous rolling mill 6 (F1 to F7 stands) to roll into a finished strip with a thickness of 1.2-12.7mm. After exiting the F7 stand, the strip passes through a laminar flow cooling device 7 to cool it to the specified temperature, and finally is sent to the coiler 8 to be coiled into a steel coil.

[0003] Reference Figure 2-1 The diagram shows a schematic of the inner coil forming process of a steel coil in a prior art coiler. In the diagram, a is the coiling side guide plate; b is the gate; c is the guide plate behind the pinch roller; 1 is the No. 1 auxiliary coiling roller; 2 is the No. 2 auxiliary coiling roller; 3 is the No. 3 auxiliary coiling roller; d is the strip head passing through the No. 1 auxiliary coiling roller; e is the strip head passing through the No. 2 auxiliary coiling roller; f is the strip head before passing through the No. 3 auxiliary coiling roller; g is the strip head passing through the No. 3 auxiliary coiling roller.

[0004] Reference Figure 2-2 In the first rotation, when the strip head enters the area of ​​the No. 1 auxiliary coiling roll, the No. 1 auxiliary coiling roll 1 lifts up h1 (see 31 in the figure). After the head passes the No. 1 auxiliary coiling roll 1, the No. 1 auxiliary coiling roll 1 presses down. In the second rotation, when the strip head enters the area of ​​the No. 1 auxiliary coiling roll 1, the No. 1 auxiliary coiling roll 1 lifts up h2 (see 32 in the figure). After the head passes the No. 1 auxiliary coiling roll 1, the No. 1 auxiliary coiling roll 1 presses down. In the nth rotation, when the strip head enters the area of ​​the No. 1 auxiliary coiling roll 1, the No. 1 auxiliary coiling roll 1 lifts up hn (see 3n in the figure). After the head passes the No. 1 auxiliary coiling roll 1, the No. 1 auxiliary coiling roll 1 presses down. The operation of the No. 2 and No. 3 auxiliary coiling rolls is similar to that of the No. 1 auxiliary coiling roll.

[0005] In practical applications, the No. 1, No. 2, and No. 3 auxiliary coiling rollers and the coil drum form a coordinated system. Under the combined action of the frictional forces on the upper and lower surfaces of the auxiliary coiling rollers and the coil drum, the strip steel is tightly wound onto the coil drum. Due to factors such as uneven equipment wear, positional fluctuations, insufficient clamping force, and deviation of the incoming strip steel head, gaps exist between the strip steel and the coil drum, resulting in poor coil density, reduced friction between the coil drum and the strip steel, decreased coil drum load, rapid decrease in coil drum current, and rapid increase in coil drum speed. When the auxiliary coiling rollers press down and contact the strip steel, they force the strip steel forward through friction. This may cause accumulation in front of a certain auxiliary coiling roller, relatively increasing the contact resistance between the auxiliary coiling rollers and the strip steel, making it more difficult for the strip steel to pass through a single auxiliary coiling roller, which is the common problem of steel blockage. When a blockage occurs, the subsequent strips are squeezed forward. As time increases, the amount of squeezing gradually increases, and the rotational resistance of the assist roll increases. In order to reach the set speed, the motor current gradually increases. After reaching a certain level, that is, when the squeezing resistance exceeds the resistance, it will push the squeezed and deformed strip through the assist roll.

[0006] Currently, wrinkles on the inner ring coiling rollers of strip steel can only be inspected manually during uncoiling, which has the following drawbacks:

[0007] 1. Low detection rate: Wrinkles are difficult to detect, and the age of wrinkles cannot be determined;

[0008] 2. Poor reliability: It is easy to make misjudgments, leading to false blocking or missed detection.

[0009] 3. High potential risks: If wrinkles are not detected, re-rolling can easily lead to strip breakage.

[0010] The invention application with application number 201610450519.9 discloses "an online method for determining folding defects in hot-rolled strip steel". This method involves determining the actual gap between the upper and lower pinch rolls when the strip steel passes through the pinch rolls; then determining whether the actual gap is greater than a set gap; and determining whether the clamping force of the upper pinch roll on the strip steel is greater than a set clamping force. If the actual gap is greater than the set gap, and the clamping force of the upper pinch roll on the strip steel is greater than the set clamping force, it indicates that a folding defect has occurred in the strip steel, and the location where the strip steel folds is recorded.

[0011] The invention application with application number 201410014360.7 discloses "an automatic monitoring method for the head and tail of hot-rolled strip steel", which includes the following steps: Step S11, start the real-time measurement function of the roll gap and speed of the inlet pinch roll and the outlet pinch roll of the descaling box; Step S12, determine whether the roll gap and speed of the inlet pinch roll meet the first alarm condition. If the first alarm condition is met, proceed to step S14; otherwise, proceed to step S13; Step S13, determine whether the roll gap and speed of the outlet pinch roll meet the second alarm condition. If the second alarm condition is met, proceed to step S14; otherwise, proceed to step S12; Step S14, output alarm information and stop steel feeding.

[0012] Invention application No. 201610067542.X discloses "A method for identifying and monitoring the tail-end stacking of a hot-rolled coiler," comprising strip steel, upper pinch rolls, lower pinch rolls, and a coil. The method monitors the combined fluctuations of the pinch roll gap (Hgap) and the pinch roll motor current. When the pinch roll gap Hgap threshold exceeds 1.4 times the threshold value and the pinch roll motor current threshold exceeds 1.9 times the threshold value, and the duration exceeds 0 ms, stacking is determined to have occurred. At this time, the monitoring system alarms and automatically blocks the stacked coil at the tail end. Operators then conduct a thorough inspection of the tail end of the coil and remove the stacked portion. Summary of the Invention

[0013] To address the above problems, this invention provides a method for identifying and monitoring wrinkles on hot-rolling coiling aid rolls, the specific technical solution of which is as follows:

[0014] A method for identifying and monitoring wrinkles on hot-rolling coiling aid rolls, characterized in that:

[0015] Based on the cause and effect dimensions of wrinkle formation, a judgment chain from cause to effect is established, and wrinkle identification and monitoring are established based on this judgment chain.

[0016] A method for identifying and monitoring wrinkles on hot rolling coiling aid rolls according to the present invention is characterized in that:

[0017] The aforementioned causal dimension consists of established monitoring of drum speed and current, as well as their respective durations.

[0018] A method for identifying and monitoring wrinkles on hot rolling coiling aid rolls according to the present invention is characterized in that:

[0019] The resulting dimension consists of the established monitoring of the auxiliary roller speed and current, as well as their respective durations.

[0020] A method for identifying and monitoring wrinkles on hot rolling coiling aid rolls according to the present invention is characterized in that:

[0021] When both cause-based and result-based wrinkle determinations are met, a wrinkle is determined to have occurred.

[0022] A method for identifying and monitoring wrinkles on hot rolling coiling aid rolls according to the present invention is characterized in that:

[0023] The monitoring of the drum speed, current, and their respective durations begins when the steel head passes through the pinch roller and ends when the auxiliary drum opens to its limit position.

[0024] A method for identifying and monitoring wrinkles on hot rolling coiling aid rolls according to the present invention is characterized in that:

[0025] The monitoring of the speed and current of the auxiliary winding roller and their respective durations begins when the steel head passes through the pinch roller and ends when the auxiliary winding roller opens to its limit position.

[0026] A method for identifying and monitoring wrinkles on hot-rolling coiling aid rolls according to the present invention is characterized by comprising the following steps:

[0027] S1: The trigger signal for monitoring the drum speed and current is triggered by the strip head passing through the pinch roller; based on this trigger signal, the monitoring of the drum speed and current begins; when the drum speed exceeds the set threshold, the process proceeds to step S2, otherwise monitoring continues until the end of the monitoring cycle; when the drum current is lower than the set threshold, the process proceeds to step S2, otherwise monitoring continues until the end of the monitoring cycle.

[0028] S2: Monitor the duration of the drum speed exceeding the set threshold. If the duration exceeds the set threshold, proceed to step S3; otherwise, continue monitoring until the monitoring cycle ends. Monitor the duration of the drum current below the set threshold. If the duration exceeds the set threshold, proceed to step S3; otherwise, continue monitoring until the monitoring cycle ends.

[0029] S3: When the duration for which the drum speed exceeds the set threshold and the duration for which the drum current is below the set threshold both exceed their respective set duration thresholds, then the wrinkle based on the cause dimension is determined to be established.

[0030] A method for identifying and monitoring wrinkles on hot-rolling coiling aid rolls according to the present invention is characterized by comprising the following steps:

[0031] SS1: The trigger signal for monitoring the speed and current of the auxiliary winding roll is triggered by the strip head passing through the pinch roll; based on this trigger signal, the monitoring of the speed and current of the auxiliary winding roll begins; when the speed of the auxiliary winding roll is found to be lower than the set threshold, the process proceeds to step SS2, otherwise monitoring continues until the end of the monitoring cycle; when the current of the auxiliary winding roll is found to exceed the set threshold, the process proceeds to step SS2, otherwise monitoring continues until the end of the monitoring cycle.

[0032] SS2: Monitor the duration of the auxiliary winding roll speed below the set threshold. If the duration exceeds the set threshold, proceed to step SS3; otherwise, continue monitoring until the monitoring cycle ends. Monitor the duration of the auxiliary winding roll current exceeding the set threshold. If the duration exceeds the set threshold, proceed to step SS3; otherwise, continue monitoring until the monitoring cycle ends.

[0033] SS3: When the duration for which the speed of the auxiliary roll is below the set threshold and the duration for which the current of the auxiliary roll exceeds the set threshold both exceed their respective set duration thresholds, the wrinkle is determined to be established based on the result dimension.

[0034] A method for identifying and monitoring wrinkles on hot rolling coiling aid rolls according to the present invention is characterized in that:

[0035] The threshold for setting the drum speed is 1.045 times the process speed setting value.

[0036] A method for identifying and monitoring wrinkles on hot rolling coiling aid rolls according to the present invention is characterized in that:

[0037] The set threshold for the drum current is 0.75 times the rated current value of the process.

[0038] A method for identifying and monitoring wrinkles on hot rolling coiling aid rolls according to the present invention is characterized in that:

[0039] The set duration threshold for when the drum speed exceeds the set threshold and the set duration threshold for when the drum current is below the set threshold are both determined according to the interval [10-10000] ms; when their respective durations fall within this interval, it is determined that their respective durations exceed the set duration threshold.

[0040] A method for identifying and monitoring wrinkles on hot rolling coiling aid rolls according to the present invention is characterized in that:

[0041] The threshold value for the speed of the auxiliary winding roller is 0.5 times the process speed setting value.

[0042] A method for identifying and monitoring wrinkles on hot rolling coiling aid rolls according to the present invention is characterized in that:

[0043] The threshold value for the current of the auxiliary winding roller is 1.5 times the process setting current.

[0044] A method for identifying and monitoring wrinkles on hot rolling coiling aid rolls according to the present invention is characterized in that:

[0045] The set duration threshold for the winding roller speed being lower than the set threshold and the set duration threshold for the winding roller current being higher than the set threshold are both determined according to the interval [10-10000] ms; when their respective durations fall within this interval, it is determined that their respective durations have exceeded the set duration threshold.

[0046] A method for identifying and monitoring wrinkles on hot rolling coiling aid rolls according to the present invention is characterized in that:

[0047] If any duration exceeds the upper limit of the set threshold range of 10000ms, it is determined to be abnormal production, thereby terminating the wrinkle determination in that cycle.

[0048] This invention provides a method for identifying and monitoring wrinkles on hot-rolled coiling auxiliary rolls. It seeks judgment criteria from both the cause and effect of wrinkle formation, and establishes a judgment chain based on the simultaneous validity of these criteria. This method achieves high accuracy in wrinkle identification and monitoring without requiring additional factors at the same level, making the judgment efficient and reliable. Using this monitoring and judgment method, the computer system can easily identify wrinkles, calculate wrinkle duration in real time, and output alarm information. The alarm information is transmitted to the quality assessment system and automatically shuts down the coil, prompting quality assessment personnel that the inner ring of the coil has an auxiliary roll wrinkle blockage and requires opening the inner ring for thorough verification. This reduces the workload of personnel. Attached Figure Description

[0049] Figure 1 This is a production line layout diagram in the background art of this invention;

[0050] Figure 2-1 This is a schematic diagram of the steel coil inner ring forming process in the prior art of this invention;

[0051] Figure 2-2 This is a schematic diagram of the treading steps of the winding roller in the prior art of this invention;

[0052] Figure 3 This is a schematic diagram of the wrinkles on the winding roller in an embodiment of the present invention;

[0053] Figure 4 This is a schematic diagram of the wrinkle monitoring and discrimination process in an embodiment of the present invention;

[0054] Figure 5 This is a schematic diagram of the drum current under wrinkle alarm in an embodiment of the present invention;

[0055] Figure 6 This is a schematic diagram of the auxiliary roller current under wrinkle alarm in an embodiment of the present invention;

[0056] Figure 7 This is a schematic diagram of the speed of the auxiliary roller under wrinkle alarm in an embodiment of the present invention;

[0057] Figure 8 This is a schematic diagram of the roll speed under wrinkle alarm in an embodiment of the present invention. Detailed Implementation

[0058] The following is a further detailed description of a method for identifying and monitoring wrinkles on a hot-rolling coiling aid roll according to the present invention, based on the accompanying drawings and specific embodiments.

[0059] See Figure 4 A method for identifying and monitoring wrinkles on hot-rolled coiling aid rolls.

[0060] Based on the cause and effect dimensions of wrinkle formation, a judgment chain from cause to effect is established, and wrinkle identification and monitoring are established based on this judgment chain.

[0061] in,

[0062] The aforementioned causal dimension consists of established monitoring of drum speed and current, as well as their respective durations.

[0063] in,

[0064] The resulting dimension consists of the established monitoring of the auxiliary roller speed and current, as well as their respective durations.

[0065] in,

[0066] When both cause-based and result-based wrinkle determinations are met, a wrinkle is determined to have occurred.

[0067] in,

[0068] The monitoring of drum speed, current, and their respective durations begins when the steel head passes through the pinch roller and ends when the auxiliary winding roller opens to its limit position; it includes the following steps:

[0069] S1: The trigger signal for monitoring the drum speed and current is triggered by the strip head passing through the pinch roller; based on this trigger signal, the monitoring of the drum speed and current begins; when the drum speed exceeds the set threshold, the process proceeds to step S2, otherwise monitoring continues until the end of the monitoring cycle; when the drum current is lower than the set threshold, the process proceeds to step S2, otherwise monitoring continues until the end of the monitoring cycle.

[0070] S2: Monitor the duration of the drum speed exceeding the set threshold. If the duration exceeds the set threshold, proceed to step S3; otherwise, continue monitoring until the monitoring cycle ends. Monitor the duration of the drum current below the set threshold. If the duration exceeds the set threshold, proceed to step S3; otherwise, continue monitoring until the monitoring cycle ends.

[0071] S3: When the duration for which the drum speed exceeds the set threshold and the duration for which the drum current is below the set threshold both exceed their respective set duration thresholds, then the wrinkle based on the cause dimension is determined to be established.

[0072] in,

[0073] The monitoring of the speed and current of the auxiliary winding roller and their respective durations begins from the moment the steel head passes through the pinch roller and ends when the auxiliary winding roller opens to its limit position; it includes the following steps:

[0074] SS1: The trigger signal for monitoring the speed and current of the auxiliary winding roll is triggered by the strip head passing through the pinch roll; based on this trigger signal, the monitoring of the speed and current of the auxiliary winding roll begins; when the speed of the auxiliary winding roll is found to be lower than the set threshold, the process proceeds to step SS2, otherwise monitoring continues until the end of the monitoring cycle; when the current of the auxiliary winding roll is found to exceed the set threshold, the process proceeds to step SS2, otherwise monitoring continues until the end of the monitoring cycle.

[0075] SS2: Monitor the duration of the auxiliary winding roll speed below the set threshold. If the duration exceeds the set threshold, proceed to step SS3; otherwise, continue monitoring until the monitoring cycle ends. Monitor the duration of the auxiliary winding roll current exceeding the set threshold. If the duration exceeds the set threshold, proceed to step SS3; otherwise, continue monitoring until the monitoring cycle ends.

[0076] SS3: When the duration for which the speed of the auxiliary roll is below the set threshold and the duration for which the current of the auxiliary roll exceeds the set threshold both exceed their respective set duration thresholds, the wrinkle is determined to be established based on the result dimension.

[0077] in,

[0078] The threshold for setting the drum speed is 1.045 times the process speed setting value.

[0079] in,

[0080] The set threshold for the drum current is 0.75 times the rated process current.

[0081] in,

[0082] The set duration threshold for when the drum speed exceeds the set threshold and the set duration threshold for when the drum current is below the set threshold are both determined according to the interval [10-10000] ms; when their respective durations fall within this interval, it is determined that their respective durations exceed the set duration threshold.

[0083] in,

[0084] The threshold value for the speed of the auxiliary winding roller is 0.5 times the process speed setting value.

[0085] in,

[0086] The threshold value for the current of the auxiliary winding roller is 1.5 times the process setting current.

[0087] in,

[0088] The set duration threshold for the winding roller speed being lower than the set threshold and the set duration threshold for the winding roller current being higher than the set threshold are both determined according to the interval [10-10000] ms; when their respective durations fall within this interval, it is determined that their respective durations have exceeded the set duration threshold.

[0089] in,

[0090] If any duration exceeds the upper limit of the set threshold range of 10000ms, it is determined to be abnormal production, thereby terminating the wrinkle determination in that cycle.

[0091] Working process, principle and implementation examples

[0092] 1. Analysis of wrinkles on the winding roller

[0093] First, the position of the strip must be determined, which means that the head of the strip must pass through the coiling pinch roll and the coiler auxiliary roll must be opened to the limit position. This is achieved using an electrical tracking signal.

[0094] Secondly, the drum speed and current are judged. Before the strip wrinkles are generated, the contact area between the drum and the strip becomes smaller and the friction becomes smaller. The drum speed increases, and the transmission control system will reduce the drum current to cope with the increase in drum speed. These two points are manifestations of the loosening of the strip coil, which is fundamentally different from the normal appearance of the inner coil of the strip head being tightly formed.

[0095] Further analysis of sudden speed changes in the auxiliary winding roll reveals that when strip wrinkles pass through the auxiliary winding roll, its speed decreases significantly due to increased actual resistance, leading to a stall. As the rotational resistance of the auxiliary winding roll increases, the transmission system, receiving a high resistance signal, increases the current to ensure a rapid speed increase to the preset level. These two points are fundamentally different from the normal phenomena observed during the inner coil formation of the strip head. A comprehensive assessment of the characteristics of both the winding drum and the auxiliary winding roll is necessary to determine whether wrinkles are present.

[0096] Next, the wrinkle time needs to be judged. Under normal circumstances, when the strip enters the area between the coil and the pinch roll, a short-term impact force and resistance will be formed. However, when a wrinkle defect occurs, the time for the speed of the auxiliary coil roll to drop suddenly and the current to rise suddenly is greatly extended. The difference between the normal situation and the wrinkle situation can be judged by the effective time.

[0097] 2. Monitoring methods for wrinkles on the winding roller

[0098] Control Principles

[0099] The drum is the main equipment for forming strip steel coils. The motor current control principle is the constant speed principle, that is, the drum speed value is set according to the actual strip speed value transmitted from the process machine computer system. When the layers of the coil become loose, the friction force on the drum decreases and the drum speed increases. The drum motor will reduce the current to maintain the stability of the set speed value.

[0100] The current control principle of the auxiliary roll motor is the constant speed principle, that is, the speed value of the auxiliary roll is set according to the actual value of the strip speed transmitted from the process machine computer system. When the auxiliary roll encounters resistance, the auxiliary roll motor will increase the current to maintain the stability of the set speed value.

[0101] The roll gap between the drum and the auxiliary roll is set according to the strip thickness, and the setting principle is as follows:

[0102] Roll gap Hgap = finished strip thickness Hstrip + αPG

[0103] αPG is classified according to plate thickness, plate width, and steel type, and stored in a static table of the digital model computer.

[0104] Under normal circumstances, to ensure that the auxiliary winding roller and the drum function as clamping, conveying, and winding rollers, they maintain appropriate friction with the strip, and the motor currents of the drum and auxiliary winding rollers are each maintained within a certain range. If the strip slips during transmission, the relative balance is broken, the drum speed increases, and the current decreases. At this time, the auxiliary winding roller changes from assisting winding to hindering winding, making it difficult for the loose strip coil to pass through. If strip wrinkles occur, the resistance of the auxiliary winding roller and the motor current change significantly and instantaneously.

[0105] Reference Figure 3 In the diagram, 21 represents strip steel, 25, 26, and 27 represent auxiliary winding rolls, 24 represents reverse resistance, 26 represents the drum, and 29 represents wrinkles. During normal production of strip steel 21, the roll gap between the drum and the auxiliary winding rolls is relatively stable. If wrinkles 29 are generated due to the drum slipping caused by factors such as cooling, waviness, or poor plate passage, the resistance of the auxiliary winding rolls will increase instantaneously, and the speed of the auxiliary winding rolls will decrease instantaneously, falling below the normally set lower limit. At the same time, the auxiliary winding rolls will be subjected to reverse resistance 24 in the rotation direction, and the current of the auxiliary winding rolls will increase instantaneously, exceeding the normally set upper limit.

[0106] Of course, drum speed and current, as well as the resistance and current of the auxiliary rollers, can reflect wrinkle phenomena. However, when the drum or auxiliary roller motor itself malfunctions, the current may momentarily exceed the normal value, or the speed may fall below the normally set lower limit. Therefore, combining these two factors can systematically prevent the risk of misjudgment.

[0107] Therefore, by monitoring the combined fluctuations in the speed of the roll and the auxiliary roll, as well as the motor current, the wrinkle phenomenon can be automatically identified.

[0108] Based on practical analysis, when the drum speed is more than 1.045 times the set speed and the actual drum current is less than 0.75 times the rated current, the drum is slipping, resulting in severe loosening between the strip layers. This can easily cause wrinkles to form at one or more auxiliary winding rollers. When the wrinkled portion enters the auxiliary winding roller, the auxiliary winding roller motor current will reach more than 1.9 times the set speed, and the actual speed of the auxiliary winding roller will be less than 0.5 times the original set speed. Therefore, the occurrence of wrinkles can be determined by the speed of the drum and auxiliary winding rollers, as well as the motor current. Note the duration of each value. If it exceeds 10ms, it is considered that the duration has exceeded the threshold (any value in the range of 10-10000 can be used as a valid value). Instances below 10ms are considered normal system operation, while those above 10000ms are considered abnormal production by the system itself. Based on practical experience, if wrinkles occur and are not detected, the user will experience a 100% chance of tape breakage when unwinding the wrinkled roll. Therefore, when wrinkles occur, an alarm is triggered when the speed and motor current exceed the acceptable threshold, and the computer control system automatically blocks and intercepts the crease.

[0109] Judgment Logic

[0110] The following conditions must occur simultaneously for a wrinkle to be considered to have formed. Specific threshold values ​​can be set according to the equipment and process characteristics of different production lines.

[0111]

[0112]

[0113] 1) Once a wrinkle is identified, the computer system will display an alarm and automatically upload it to the quality assessment system, which will then automatically block the operation and proceed with subsequent processing.

[0114] 2)Reference Figure 4 After the strip head passes the pinch roll, the auxiliary winding roll wrinkle detection program is activated. It detects when the drum speed rises to more than 1.045 times the set speed and the current drops to less than 0.75 times the rated current value. Then it checks the auxiliary winding roll current and speed. If the auxiliary winding roll current exceeds the set value by more than 1.5 times for more than 10 ms and the speed is less than the set value by more than 0.5 m / s, it is considered that an auxiliary winding roll wrinkle defect has occurred. The system information is uploaded and automatically blocked.

[0115] The above technical solutions are adopted:

[0116] 1. Reduce labor intensity: Alarm information is prominently displayed on the screen, so operators only need to focus on observing the alarm information;

[0117] 2. High reliability: Through computer monitoring and control, supplemented by manual monitoring, misjudgment, missed judgment, and untimely intervention can be avoided;

[0118] 3. Reduced risk: Wrinkles at the tail of the strip can be effectively detected and the system can automatically control the process, reducing the risk of strip breakage and the escalation of accidents for users.

[0119] According to the scheme implemented in the 1580 production line of the hot rolling mill of Baoshan Iron & Steel Co., Ltd., the specific parameters are as follows:

[0120]

[0121] A wrinkle occurred at the tail end during the rolling of a certain strip steel coil. The monitoring alarm and interception process is as follows:

[0122] Reference Figures 5-8 The thickness of the finished strip steel in the inner ring stepping stage of the steel coil is 2.52mm. After the head of this strip steel enters between the drum and the auxiliary winding roller, the drum speed quickly rises to 105% of the set speed, the drum current drops to 49% (rated current), the inner ring unwinds, and then the auxiliary winding roller motor current instantly rises to more than 46.67A (1.6 times the set value of 29.16A); the auxiliary winding roller speed drops to 1m / s, which is lower than the lower limit (0.08 times the set value of 12m / s), and the duration exceeds 150ms, triggering an alarm in the on-site primary computer control system.

[0123] After wrinkles are found at the tail end of the strip steel, the primary computer control system transmits the problem to the quality control judgment system. According to the agreement, the wrinkled coil at the tail end is automatically sealed. Operators are then dispatched to uncoil and inspect the coil, where wrinkles are found in the corresponding area. The wrinkled portion is then removed.

[0124] This invention provides a method for identifying and monitoring wrinkles on hot-rolled coiling auxiliary rolls. It seeks judgment criteria from both the cause and effect of wrinkle formation, and establishes a judgment chain based on the simultaneous validity of these criteria. This method achieves high accuracy in wrinkle identification and monitoring without requiring additional factors at the same level, making the judgment efficient and reliable. Using this monitoring and judgment method, the computer system can easily identify wrinkles, calculate wrinkle duration in real time, and output alarm information. The alarm information is transmitted to the quality assessment system and automatically shuts down the coil, prompting quality assessment personnel that the inner ring of the coil has an auxiliary roll wrinkle blockage and requires opening the inner ring for thorough verification. This reduces the workload of personnel.

Claims

1. A method for identifying and monitoring wrinkles of a hot rolling coiler roll, characterized in that: a judgment chain from cause to result is established based on a cause dimension and a result dimension of the wrinkles, and the identification and monitoring of the wrinkles are established according to the judgment chain, the cause dimension is constituted by established monitoring of the coiler speed and current and their respective durations, the monitoring of the coiler speed and current and their respective durations starts from the moment when the strip head passes through the pinch roll and ends at the moment when the coiler roll opens to the limit position, the monitoring of the coiler speed and current and their respective durations comprises the following steps: S1: taking the strip head passing through the pinch roll as a trigger signal for triggering the monitoring of the coiler speed and current; entering the monitoring of the coiler speed and current according to the trigger signal; when the monitored coiler speed exceeds the set threshold, entering step S2, otherwise continuing to monitor until the monitoring period ends; when the monitored coiler current is lower than the set threshold, entering step S2, otherwise continuing to monitor until the monitoring period ends; S2: monitoring the duration of the coiler speed exceeding the set threshold, when the duration exceeds the set threshold, entering step S3, otherwise continuing to monitor until the monitoring period ends; monitoring the duration of the coiler current being lower than the set threshold, when the duration exceeds the set threshold, entering step S3, otherwise continuing to monitor until the monitoring period ends; S3: when the duration of the coiler speed exceeding the set threshold and the duration of the coiler current being lower than the set threshold both exceed their respective set duration thresholds, it is determined that the wrinkles based on the cause dimension are established, when the wrinkles based on the cause dimension are determined and the wrinkles based on the result dimension are determined at the same time, it is determined that the wrinkles occur, the monitoring of the coiler speed and current and their respective durations starts from the moment when the strip head passes through the pinch roll and ends at the moment when the coiler roll opens to the limit position, the result dimension is constituted by established monitoring of the coiler speed and current and their respective durations, the monitoring of the coiler speed and current and their respective durations comprises the following steps: SS1: taking the strip head passing through the pinch roll as a trigger signal for triggering the monitoring of the coiler speed and current; entering the monitoring of the coiler speed and current according to the trigger signal; when the monitored coiler speed is lower than the set threshold, entering step SS2, otherwise continuing to monitor until the monitoring period ends; when the monitored coiler current exceeds the set threshold, entering step SS2, otherwise continuing to monitor until the monitoring period ends; SS2: monitoring the duration of the coiler speed being lower than the set threshold, when the duration exceeds the set threshold, entering step SS3, otherwise continuing to monitor until the monitoring period ends; monitoring the duration of the coiler current exceeding the set threshold, when the duration exceeds the set threshold, entering step SS3, otherwise continuing to monitor until the monitoring period ends; SS3: when the duration of the coiler speed being lower than the set threshold and the duration of the coiler current exceeding the set threshold both exceed their respective set duration thresholds, it is determined that the wrinkles based on the result dimension are established. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2. A method of identification and monitoring of wrinkles on a hot strip coiling aid roll according to claim 1, characterized in that, ​ ​ ​ ​ 3. The method according to claim 1, characterized in that: In the monitoring of the reel speed and current and their respective durations, the set threshold value for the reel speed is 1.045 times the process set speed value.

4. The method according to claim 1, characterized in that: In the monitoring of the reel speed and current and their respective durations, the set threshold value for the reel current is 0.75 times the process rated current value.

5. The method according to claim 1, characterized in that: In the monitoring of the reel speed and current and their respective durations, the set duration threshold value for the reel speed exceeding the set threshold value and the set duration threshold value for the reel current falling below the set threshold value are each determined in the interval [10-10000] ms; when the respective duration falls within this interval, it is determined that the respective duration exceeds the set duration threshold value.

6. The method according to claim 2, characterized in that: In the monitoring of the coiler speed and current and their respective durations, the set threshold value for the coiler speed is 0.5 times the process set speed value.

7. The method according to claim 2, characterized in that: In the monitoring of the coiler speed and current and their respective durations, the set threshold value for the coiler current is 1.5 times the process set current value.

8. The method according to claim 2, characterized in that: In the monitoring of the coiler speed and current and their respective durations, the set duration threshold value for the coiler speed falling below the set threshold value and the set duration threshold value for the coiler current exceeding the set threshold value are each determined in the interval [10-10000] ms; when the respective duration falls within this interval, it is determined that the respective duration exceeds the set duration threshold value.

9. The method according to claim 5 or 8, characterized in that: When either of the durations exceeds the upper limit 10000 ms of the set threshold value interval, it is determined that there is an abnormal production, and thus the wrinkle determination under the cycle is terminated.

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