A control method for automatically handling the folding of the tail of an intermediate blank

Abstract

The present application relates to a kind of control methods for automatically handling intermediate blank tail folding, after the entry of hot coil box tail flat tail control, by collecting hot coil box flat tail pin flat tail pin position signal for logical judgment, judge whether the hot coil box flat tail pin is completely reached set position when HMD is lost at finish rolling entrance, while collecting the position feedback of hot coil box pinch roll when pressure ring is lost, logical judgment is carried out using position information, judge whether intermediate blank tail is folding state by pinch roll, when the above two signals all satisfy set condition, it is judged that intermediate blank tail folding, the signal is sent to flying shear cutting system, automatically trigger to increase the logic of flying shear tail cutting length OFFSET Value to maximum, so that hot coil box has the function of automatically diagnosing tail folding and simultaneously automatically increasing cutting amount to cut off the folding part of intermediate blank. Fully unmanned monitoring of hot coil box flat tail pin post is realized, the level of automatic rolling is improved, the production stability of rolling line is improved, and the loss of unplanned shutdown is reduced.

Description

Technical Field

[0001] This invention relates to a control method for automatically handling the tail folding of intermediate billets, belonging to the field of hot rolling technology. Background Technology

[0002] In the hot strip rolling process, hot coil boxes are increasingly used in production lines because they shorten the rolling line distance, provide steel coil storage, and reduce the temperature drop of intermediate billets. However, since hot coil boxes use coreless coiling to roll intermediate billets into coils, a flat-end pin must be used to separate the end of the coil after uncoiling. Otherwise, the end of the intermediate billet will fold and enter the subsequent process, causing the stacked thickness to exceed the shearing capacity of the flying shear, resulting in shear blade breakage, or the stacked billet will enter the finishing mill, causing the mill to trip. Both of these situations are extremely serious production accidents. Production line designs typically install hot coil box pinch rolls after the flat-end pin and a finishing mill inlet high-temperature detection device at the pinch roll exit. During production, various situations may occur where the flat-end pin fails to flatten the end. Although a series of technical error-proofing measures are taken, it is still impossible to completely avoid these issues. In actual production, operators have discovered through practice that the folded tail portion is generally compressed into a shorter area, but this length is greater than the conventional tail shear cutting length. If the tail pin is not flattened, quickly adjusting the tail shear cutting length can cut off the folded tail portion without affecting production. However, this requires that the tail fold be identified and the cutting length adjusted before the flying shear is started. These operations generally need to be completed within 2 seconds. However, under normal conditions, operators cannot react quickly enough. Missing this opportunity necessitates a quick stop of the finishing mill to protect equipment safety, resulting in scrap steel. Failure to detect and address this promptly will lead to production interruption and significant impact.

[0003] There are two traditional approaches. One is to rely entirely on manual observation, quickly intervening in the length of the flying shear tail when the insertion timing of the flat tail pin is abnormal. If intervention is not timely, the finishing mill must be stopped immediately and scrapped. This requires a high level of responsibility and skill from the operators and cannot completely solve the problem. The second approach, as described in the paper "Functional Application of Automatic Shearing of Folded Tail of Strip Steel", judges the tail fold by the position of the pinch roll gap exceeding a certain range. After the tail fold is determined, a shearing command is issued for immediate shearing, and the roller table reverses. However, due to the temperature drop and radius reduction at the end of the intermediate coil uncoiling, it is very common for the tail roll gap to fluctuate significantly, which can lead to false triggering of the condition. At the same time, some intermediate billets will remain on the roller table in front of the flying shear, and subsequent production must be stopped to deal with the intermediate billets remaining on the roller table, resulting in production interruption and seriously affecting production. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the above-mentioned technology and provide an automatic control method for handling the tail fold of the intermediate billet. After the hot rolling box enters the tail flat control, the hot rolling box performs logical judgment by collecting the tail flat pin position signal and the pinch roller position signal, so that the hot rolling box has the function of automatically diagnosing the tail fold and simultaneously automatically increasing the shearing amount to cut off the folded part of the intermediate billet.

[0005] To solve the above-mentioned technical problems, the technical solution proposed by this invention is: a control method for automatically handling the tail folds of intermediate blanks, comprising the following steps:

[0006] (1) When the tracking distance at the tail of the intermediate billet reaches L, the hot coil box pinch rolls begin to enter the pressure ring from the intermediate waiting position H. L is an empirical value, L: [0m, 10m]. Before the pinch roll pressure ring is lost, the current intermediate billet width W, intermediate billet thickness h, finishing mill entry HMDX steel signal, and real-time feedback hot coil box pinch roll position data H are collected. N And the current flying shear tail cutting length setting value X.

[0007] (2) Based on the intermediate billet width W collected in the previous step, calculate the setting position P of the flat tail pin. A Among them, P A =WA, where A is an empirical value, A: [200, 800].

[0008] (3) When the intermediate roll is unwound to a diameter less than D, the flat tail pin begins to move from the initial position P to the set position P. A Move, where P A The values ​​of D and P are calculated from the width of the intermediate billet. D: [800, 1000], P: [1600, 1800].

[0009] (4) The flat tail pin moves from the initial position P to the set position P A During the movement, the position P of the tail pin is collected in real time. M .

[0010] (5) When the pressure signal of the pinch roll in the hot coil box is lost during the unwinding process at the tail end, record the position data of the pinch roll in the hot coil box at this time as H. N , H N The result of comparing with the intermediate billet thickness data h is denoted as signal S1. If H N If the sum is greater than or equal to C*h, the state of signal S1 is set to 1; otherwise, the state of signal S1 is set to 0. Signal S1 is used as one of the signals to determine the tail fold. C is an empirical value, C: [1.5, 3.0].

[0011] (6) When the HMDX signal is lost at the entrance of the finishing mill after the strip is uncoiled at the tail end, record the position P of the flat tail pin at this time. M , will P MWith P A The comparison result is denoted as S2. If P M >P A +B sets the state of signal S2 to 1, and vice versa, sets the state of signal S2 to 0. B is an empirical value with a range of [20, 300]. Signal S2 is used as one of the signals to determine the tail fold.

[0012] (7) Use S1 and S2 signals as input signals to build logic in the program, output signal S3, and send the signal to the flying shear cutting system. Set the state of signal S3 to 1 if and only if both S1 and S2 signals are 1 at the same time, otherwise set the state of signal S3 to 0.

[0013] (8) When the S3 signal is 1, the flying shear tail cutting length setting value is automatically selected as X. max X max This is an empirical value, with a range of [100, 800]. When the S3 signal is 0, the flying shear tail cutting length setting value is still selected as X. When the strip tail passes the flying shear, the corresponding setting value is selected according to the signal to execute.

[0014] (9) When the HMDX signal is lost, the flat tail pin retracts to the initial position P, the hot coil box clamping roller is raised to the middle waiting position H, the flying shear tail shearing is completed and the flying shear tail shearing length setting value is restored to X, the program ends, and all signal statuses are restored to the next piece of steel waiting state.

[0015] An electronic device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: when the processor executes the program, it implements the aforementioned control method for automatically handling the tail folding of an intermediate blank.

[0016] A computer-readable storage medium storing computer instructions, which, when executed by a processor, implement the aforementioned control method for automatically handling tail folds in intermediate billets. Through a process program, automatic diagnosis of whether the tail of the intermediate billet in the hot-rolling box area is folded is achieved, and logic for automatically increasing the shearing amount of the flying shear is designed, ensuring that tail folds, regardless of the circumstances, can completely prevent abnormalities from escalating into accidents.

[0017] This invention provides an automated control method for handling tail folds in intermediate billets, changing the traditional reliance on manual judgment of tail folds followed by emergency measures to increase the tail-cutting length, which could not completely prevent accidents. Through an automated process control program, it achieves automatic diagnosis of whether the tail of the intermediate billet in the hot rolling mill area is folded, and designs logic to automatically increase the shearing amount of the flying shear. This ensures that tail folds, regardless of the cause, can be completely prevented from escalating into accidents. The precise tail fold diagnosis and automatic shearing increase function reverse the predicament of relying solely on manual intervention when tail folds are detected, enabling unmanned monitoring of the flat tail pins in the hot rolling mill area. This further improves the full automation level of the hot rolling mill area, while also preventing the escalation of accidents caused by tail folds, reducing unplanned downtime, and further lowering the company's production costs. Detailed Implementation

[0018] To enhance understanding of the present invention, the present invention will be described in detail below with reference to embodiments.

[0019] Example: A control method for automatically handling tail folds in intermediate billets, comprising the following steps:

[0020] (1) When the tracking distance at the tail of the intermediate billet reaches L, the hot coil box pinch rolls begin to enter the pressure ring from the intermediate waiting position H. L is an empirical value, L: [0m, 10m]. Before the pinch roll pressure ring is lost, the current intermediate billet width W, intermediate billet thickness h, finishing mill entry HMDX steel signal, and real-time feedback hot coil box pinch roll position data H are collected. N And the current flying shear tail cutting length setting value X.

[0021] (2) Based on the intermediate billet width W collected in the previous step, calculate the setting position P of the flat tail pin. A Among them, P A =WA, where A is an empirical value, A: [200, 800].

[0022] (3) When the intermediate roll is unwound to a diameter less than D, the flat tail pin begins to move from the initial position P to the set position P. A Move, where P A The values ​​of D and P are calculated from the width of the intermediate billet. D: [800, 1000], P: [1600, 1800].

[0023] (4) The flat tail pin moves from the initial position P to the set position P A During the movement, the position P of the tail pin is collected in real time. M .

[0024] (5) When the pressure signal of the pinch roll in the hot coil box is lost during the unwinding process at the tail end, record the position data of the pinch roll in the hot coil box at this time as H.N , H N The result of comparing with the intermediate billet thickness data h is denoted as signal S1. If H N If the sum is greater than or equal to C*h, the state of signal S1 is set to 1; otherwise, the state of signal S1 is set to 0. Signal S1 is used as one of the signals to determine the tail fold. C is an empirical value, C: [1.5, 3.0].

[0025] (6) When the HMDX signal is lost at the entrance of the finishing mill after the strip is uncoiled at the tail end, record the position P of the flat tail pin at this time. M , will P M With P A The comparison result is denoted as S2. If P M >P A +B sets the state of signal S2 to 1, and vice versa, sets the state of signal S2 to 0. B is an empirical value with a range of [20, 300]. Signal S2 is used as one of the signals to determine the tail fold.

[0026] (7) Use S1 and S2 signals as input signals to build logic in the program, output signal S3, and send the signal to the flying shear cutting system. Set the state of signal S3 to 1 if and only if both S1 and S2 signals are 1 at the same time, otherwise set the state of signal S3 to 0.

[0027] (8) When the S3 signal is 1, the flying shear tail cutting length setting value is automatically selected as X. max X max This is an empirical value, with a range of [100, 800]. When the S3 signal is 0, the flying shear tail cutting length setting value is still selected as X. When the strip tail passes the flying shear, the corresponding setting value is selected according to the signal to execute.

[0028] (9) When the HMDX signal is lost, the flat tail pin retracts to the initial position P, the hot coil box clamping roller is raised to the middle waiting position H, the flying shear tail shearing is completed and the flying shear tail shearing length setting value is restored to X, the program ends, and all signal statuses are restored to the next piece of steel waiting state.

[0029] Let's take a specific application case as an example to illustrate.

[0030] Application examples:

[0031] Taking Meigang 1422 hot strip mill SPHC with specifications of 2.5mm*1200mm as an example.

[0032] (1) When the tracking distance at the tail of the intermediate billet reaches 9m, the hot coil box pinch rolls begin to enter the pressure ring from the intermediate waiting position of 90mm. Before the pinch roll pressure ring is lost, the current intermediate billet width of 1200mm, intermediate billet thickness of 40mm, steel signal at the finishing mill entrance HMD59, and real-time feedback of the hot coil box pinch roll position data H are collected. N And the current flying shear tail cutting length setting is 100mm.

[0033] (2) When the intermediate roll is unwound to a diameter less than 900mm, the flat tail pin begins to move from the initial position P = 1600mm to the set position P. A =600mm movement, where P A =WA, the empirical value of A for Meigang is 600mm. During this process, the position P of the flat-end pin is collected in real time. M .

[0034] (3) Based on the intermediate billet width of 1200mm collected in the previous step, calculate the setting position P of the flat tail pin. A Among them, P A =1200-600=600mm.

[0035] (4) When the intermediate roll is unwound to a diameter less than 900mm, the flat tail pin begins to move from the initial position P = 1600mm to the set position P. A =600mm movement, where P A =WA, the empirical value of A for Meigang is 600mm.

[0036] (5) The flat tail pin moves from the initial position P = 1600 mm to the set position P A =During the 600mm movement, the position P of the flat tail pin is collected in real time. M .

[0037] (6) When the pressure signal of the pinch roll in the hot coil box is lost during the unwinding process at the tail end, record the position data of the pinch roll in the hot coil box at this time as H. N For 80mm, H N The result of comparing with the intermediate billet thickness data h = 40mm is recorded as signal S1. If 80mm ≥ 1.8 * 40mm, the state of signal S1 is set to 1.

[0038] (7) When the HMD59 signal is lost at the entrance of the finishing mill after the strip is uncoiled at the tail end, record the position P of the flat tail pin at this time. M For 850mm, P M With P A The comparison result is denoted as S2, P M >P A +B, where the empirical value of Meigang is 200mm, and the result is 850mm>600mm+200mm, so the state of signal S2 is set to 1.

[0039] (8) If both S1 and S2 signals are 1, then output signal S3 and send the signal to the flying shear system to set the state of signal S3 to 1.

[0040] (9) When the S3 signal is 1, the flying shear tail cutting length setting value is automatically selected as X. max Meigang's X max The empirical value is 500mm. When the tail of the strip passes the flying shear, the setting value of 500mm should be followed.

[0041] When the HMD59 signal is lost, the flat tail pin retracts to the initial position P=1600mm, the hot coil box clamping rollers are raised to the intermediate waiting position H=90mm, the flying shear tail shearing is completed and the flying shear tail shearing length setting value is restored to 100mm, the program ends, and all signal statuses are restored to the next piece of steel waiting state.

[0042] It should be noted that the above embodiments are not intended to limit the scope of protection of the present invention. Equivalent transformations or substitutions made based on the above technical solutions all fall within the scope of protection of the claims of the present invention.

Claims

1. A control method for automatically handling the tail folding of intermediate billets, characterized in that, Includes the following steps: Step 1: When the tracking distance at the tail of the intermediate billet reaches L, the hot coil box pinch rolls begin to enter the pressure ring from the intermediate waiting position H. Before the pinch roll pressure ring is lost, the current intermediate billet width W, intermediate billet thickness h, finishing mill entry HMDX steel signal, and real-time feedback hot coil box pinch roll position data H are collected. N And the current flying shear tail cutting length setting value X, Step 2: Based on the intermediate billet width W collected in the previous step, calculate the setting position P of the flat tail pin. A , where P A =WA, Step 3: When the intermediate roll unwinds to a diameter less than D, the flat tail pin begins to move from the initial position P to the set position P. A Move, where P A Calculated from the width of the intermediate billet. Step 4: The tail pin moves from the initial position P to the set position P A During the movement, the position P of the tail pin is collected in real time. M , Step 5: When the pressure signal of the pinch rolls in the hot coil box is lost during the unwinding process at the tail end, record the position data of the pinch rolls in the hot coil box at this time as H. N , will H N The result of comparing with the intermediate billet thickness data h is denoted as signal S1. If H N If the sum of the given values ​​is greater than or equal to C*h, the state of signal S1 is set to 1; otherwise, the state of signal S1 is set to 0. Signal S1 is used as one of the signals for determining tail folding. Step 6: When the HMDX signal is lost at the entrance of the finishing mill after the strip is uncoiled at the tail end, record the position P of the flat tail pin at this time. M , will P M With P A The comparison result is denoted as S2. If P M >P A +B sets the state of signal S2 to 1, and vice versa, sets the state of signal S2 to 0. Here, B is an empirical value ranging from [20, 300]. Signal S2 is used as one of the signals to determine tail folding. Step 7: Use signals S1 and S2 as input signals to build logic in the program, output signal S3, and send this signal to the flying shear system. Signal S3 is set to 1 only when both signals S1 and S2 are 1; otherwise, it is set to 0. Step 8: When the S3 signal is 1, the flying shear tail cutting length setting value is automatically selected as X. max X max These are empirical values, ranging from [100, 800]. When the S3 signal is 0, the flying shear tail cutting length setting is still selected as X. When the strip tail passes the flying shear, the corresponding setting value is selected according to the signal to execute the operation. Step 9: When the HMDX signal is lost, the flat tail pin retracts to the initial position P, the hot coil box clamping rollers are raised to the middle waiting position H, the flying shear tail shearing is completed and the flying shear tail shearing length setting value is restored to X, the program ends, and all signal statuses are restored to the next piece of steel waiting state.

2. The control method for automatically handling the tail folding of intermediate billets according to claim 1, characterized in that, In step 1, L is an empirical value, L: [0m, 10m].

3. The control method for automatically handling the tail folding of intermediate billets according to claim 1, characterized in that, In step 2, A is an empirical value, A: [200, 800].

4. The control method for automatically handling the tail folding of intermediate billets according to claim 1, characterized in that, In step 3, D and P are both empirical values, D: [800, 1000], P: [1600, 1800].

5. The control method for automatically handling the tail folding of intermediate billets according to claim 1, characterized in that, In step 5, C is an empirical value, C: [1.5, 3.0].

6. An electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, it implements a control method for automatically handling the tail folding of intermediate billets as described in any one of claims 1 to 5.

7. A computer-readable storage medium storing computer instructions thereon, characterized in that: When the computer instructions are executed by the processor, they implement a control method for automatically handling the tail folding of an intermediate billet as described in any one of claims 1-5.