Strip tail control method and device and computer equipment

Abstract

The application provides a strip tail control method, device and computer equipment, which is applied to a hot rolling production line. The hot rolling production line is sequentially arranged along a strip running direction and comprises a finishing mill stand, a laminar cooling roller way, a pinch roll, a coiling aid roll and a coiler. Through optimization of a collaborative speed control logic of the coiler core shaft, the coiling aid roll, the pinch roll and the laminar cooling roller way, a core shaft deceleration timing is dynamically calculated according to an actual running position of a strip tail after the seventh finishing mill stand is thrown, a uniform speed running interval and a deceleration stroke are reasonably distributed, the core target coiler core shaft deceleration timing is adapted to the strip tail position, strip slack caused by premature deceleration of the core shaft is avoided, the strip tail arching problem in the laminar cooling section after a specification change is effectively solved, and the coiling quality and production efficiency of a thin specification strip are improved.

Description

Technical Field

[0001] This invention relates to the field of strip tail control technology in strip rolling with variable specifications, and particularly to a strip tail control method, device and computer equipment. Background Technology

[0002] The first strip produced after the 1580mm hot strip mill completes the specification switch is a thin strip with a thickness of ≤2.0mm. Under this condition, the process and throwing speed of the two strips are very different, which is a high-incidence scenario for tail arch sleeve failure.

[0003] In existing technology, the speed setting for the mandrel tail deceleration directly calls the scrap speed acquisition signal from the F7 scrapping speed of the seventh (last) finishing mill stand. When the strip tail deceleration trigger point coincides with the instantaneous scrapping speed of the F7 stand, the moment the mandrel (coiler mandrel) speed setting module reads the signal is earlier than the memory refresh time of the actual scrapping speed of the current strip on the F7 stand. At this time, the storage unit has not yet been updated to the actual scrapping speed of the current strip, and the mandrel speed setting directly reads and uses the scrapping speed value of the previous strip on the F7 stand, causing the speed setting value to deviate significantly from the actual exit speed of the current strip.

[0004] When the mandrel incorrectly uses the throwing speed of the previous strip as the deceleration benchmark, the actual deceleration rate of the mandrel will deviate from the reasonable range matched to the current strip. As a result, the tail of the strip cannot be effectively tensioned during the laminar cooling roller conveyor process, and excess strip material accumulates in the laminar cooling area, eventually causing a laminar cooling tail arch failure. This can result in scrapping of the steel coil tail and product downgrading, or even cause the laminar cooling section to be shut down due to steel accumulation. This not only reduces the strip yield but also affects the production line efficiency. Summary of the Invention

[0005] To address the problems existing in the prior art, this invention provides a strip tail control method, device, and computer equipment to solve or partially solve the technical problem that, when rolling thin strips on a hot continuous rolling line, the first coil of thin strip is prone to tail arch failure in the intercooling section, resulting in poor coil quality and reduced production line efficiency.

[0006] A first aspect of the present invention provides a strip tail control method applied in a hot rolling production line, wherein the hot rolling production line is arranged sequentially along the strip running direction as follows: a finishing mill stand, a layer cooling roller table, pinch rolls, coiling aid rolls, and a coiler; the finishing mill stand includes 7 stands; the method includes: The rolls of the finishing mill stand, the layer cooling roll table, the pinch rolls, the coiling aid rolls, the mandrel of the target coiler, and the strip are controlled to run at synchronous speed, and tension control is performed on the strip between the rolls and the mandrel of the seventh finishing mill stand; Upon receiving a steel-throwing signal from the fourth finishing mill stand, the layer cooling roller table is controlled to switch from the synchronous speed to the first lagging speed; the first lagging speed is determined based on the actual operating speed of the target coiler mandrel. Upon receiving a steel-throwing signal from the sixth finishing mill stand, the pinch roll is switched from synchronous speed control mode to negative torque control mode; the coiling aid roll is controlled to switch from synchronous speed to second lagging speed. Upon receiving the steel throwing signal from the seventh finishing mill stand, the actual speed and the fixed tail speed of the current coiled strip are obtained; based on the actual speed, the fixed tail speed, the length of the laminar flow table, and the distance between the current coiled strip and the pinch roll, the first deceleration distance of the current coiled strip on the laminar flow table is determined. The actual running speed of the target coiler mandrel is controlled based on the first deceleration distance of the current coiled strip on the cooling roller table, so that the deceleration timing of the target coiler mandrel matches the position of the tail of the current coiled strip.

[0007] In the above scheme, the layer cooling roller conveyor includes multiple sets, and controlling the layer cooling roller conveyor to switch from the synchronous speed to the first lagging speed includes: Obtain the speed attenuation coefficient corresponding to each layer of the cold roller conveyor; The first lag speed corresponding to the cold roller conveyor layer is determined based on the speed attenuation coefficient corresponding to each layer of the cold roller conveyor and the actual running speed of the target winding machine core shaft. The synchronous speed of each layer of the cold roller conveyor is switched to its corresponding first lag speed.

[0008] In the above scheme, the negative torque corresponding to the negative torque control mode is determined through the following steps: Obtain the strip tension between the rolls and mandrel of the seventh finishing mill stand; The negative torque is determined based on the strip tension and the diameter of the pinch roll.

[0009] In the above scheme, the coiler includes multiple coilers. Determining the first deceleration distance of the current strip on the cooling roller table based on the actual speed of the current strip, the fixed tail speed of the current strip, the length of the laminar flow cooling roller table, and the distance between the current strip and the pinch roll includes: The available distance is determined based on the length of the cold roll table, the distance between the current coiled strip and the pinch roll, and the distance between the target coiler and the first coiler in the strip running direction. The second deceleration distance corresponding to the completion of deceleration of the target coiler mandrel is determined based on the actual speed of the current coiled strip, the fixed tail speed of the current coiled strip, and the preset strip tail deceleration rate. The first deceleration distance is determined based on the available distance and the second deceleration distance; the first deceleration distance is the difference between the available distance and the second deceleration distance.

[0010] In the above scheme, determining the available distance based on the length of the layered cooling roller table, the distance between the current coiled strip and the pinch roll, and the distance between the target coiler and the first coiler in the strip running direction includes: According to the formula Determine the available distance S 2; among which, S1 is the length of the layer cold roller conveyor. m The distance between the target coiler and the first coiler in the strip running direction, the n The distance between the current coiled strip and the pinch roll; If the target coiler is the first coiler in the strip running direction, the distance between the target coiler and the first coiler in the strip running direction is 0; If the target coiler is the second coiler in the strip running direction, the distance between the target coiler and the first coiler in the strip running direction is 10m; If the target coiler is the third coiler in the strip running direction, the distance between the target coiler and the first coiler in the strip running direction is 20m.

[0011] In the above scheme, determining the second deceleration distance corresponding to the completion of deceleration of the target coiler mandrel based on the actual speed of the current coiled strip, the fixed tail speed of the current coiled strip, and the preset strip tail deceleration rate includes: According to the formula Determine the second deceleration distance S 2; among which, The V 1 represents the actual speed of the current coiled steel. V The current tail speed of the coiled steel is the constant speed. a The reduction rate at the tail of the strip is denoted as .

[0012] In the above scheme, controlling the actual running speed of the target coiler mandrel based on the first deceleration distance of the current coiled strip on the cooling roller table includes: If the first deceleration distance is greater than 0, the mandrel of the target coiler is controlled to run the first distance at the actual speed of the current coiled strip, and then the mandrel of the target coiler is controlled to reduce from the actual speed of the current coiled strip to the fixed tail speed of the current coiled strip based on the deceleration rate of the strip tail. When the tail of the current coiled steel passes the hot metal detector at the entrance of the target coiler, the mandrel of the target coiler is triggered to perform tail-fixing control on the current coiled steel.

[0013] In the above scheme, controlling the actual running speed of the target coiler mandrel based on the first deceleration distance of the current coiled strip on the cooling roller table includes: If the first deceleration distance is less than or equal to 0, the mandrel of the target coiler is controlled to decrease from the actual speed of the current coiled strip to the fixed tail speed of the current coiled strip based on the strip tail deceleration rate control. When the tail of the current coiled steel passes the hot metal detector at the entrance of the target coiler, the mandrel of the target coiler is triggered to perform tail-fixing control on the current coiled steel.

[0014] A second aspect of the present invention provides a strip tail control device for use in a hot rolling production line, wherein the hot rolling production line is provided with, in sequence along the strip running direction: a finishing mill stand, a layer cooling roller table, pinch rolls, coiling aid rolls, and a coiler; the device includes: The first control unit is used to control the rolls of the finishing mill stand, the laminar flow table, the pinch rolls, the coiling aid rolls, the mandrel of the target coiler, and the strip to run at synchronous speed, and to perform tension control on the strip between the rolls and the mandrel of the seventh finishing mill stand; The second control unit is used to control the layer cooling roller table to switch from the synchronous speed to the first lagging speed when a steel throwing signal is received from the fourth finishing mill stand; the first lagging speed is determined according to the actual running speed of the target coiler mandrel; The switching unit is used to switch the pinch roll from synchronous speed control mode to negative torque control mode when it receives the steel throwing signal from the sixth finishing mill stand. The determining unit is used to obtain the actual speed and the fixed tail speed of the current coiled strip when receiving the steel throwing signal from the seventh finishing mill stand; and to determine the first deceleration distance of the current coiled strip on the cooling roller table based on the actual speed, the fixed tail speed, the length of the laminar flow table, and the distance between the current coiled strip and the pinch roll. The third control unit is used to control the actual running speed of the target coiler mandrel based on the first deceleration distance of the current coiled strip on the cooling roller table, so as to match the deceleration timing of the target coiler mandrel with the position of the tail of the current coiled strip.

[0015] A third aspect of the present invention provides a computer device including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the program, implements the steps of the method described in any of the first aspects.

[0016] This invention provides a strip tail control method, device, and computer equipment, applied in a hot rolling production line. The hot rolling production line is arranged sequentially along the strip running direction as follows: a finishing mill stand, a cooling roller table, pinch rolls, coiling aid rolls, and a coiler; the finishing mill stand includes seven stands; the method includes: controlling the rolls of the finishing mill stand, the cooling roller table, the pinch rolls, the coiling aid rolls, the mandrel of the target coiler, and the strip to run at synchronous speeds, and performing tension control on the strip between the rolls and mandrel of the seventh finishing mill stand. Upon receiving a steel-throwing signal from the fourth finishing mill stand, the cooling roller table is controlled to switch from the synchronous speed to a first lagging speed; the first lagging speed is determined based on the actual operating speed of the target coiler mandrel; upon receiving a steel-throwing signal from the sixth finishing mill stand, the pinch rolls are switched from synchronous speed control mode to negative torque control mode; the auxiliary coiling rolls are controlled to switch from the synchronous speed to a second lagging speed; upon receiving a steel-throwing signal from the seventh finishing mill stand, the actual speed and tail speed of the current coiled strip are acquired; based on the actual speed, tail speed, length of the cooling roller table, and distance between the current coiled strip and the pinch rolls, the first deceleration distance of the current coiled strip on the cooling roller table is determined; the actual operating speed of the target coiler mandrel is controlled based on the first deceleration distance of the current coiled strip on the cooling roller table to match the deceleration timing of the target coiler mandrel with the position of the tail of the current coiled strip; thus, through The coordinated speed control logic of the coiler mandrel, auxiliary coiling roll, pinch roll, and laminar flow roller is optimized. After the strip is thrown off the seventh finishing mill stand, the timing of the mandrel deceleration is dynamically calculated based on the actual travel position of the strip tail. The uniform speed running range and deceleration stroke are reasonably allocated so that the timing of the deceleration of the mandrel of the coiler is matched with the position of the strip tail. This avoids premature deceleration of the mandrel, which can cause strip tension loss and slack. It effectively solves the problem of strip tail arching that is prone to occur in the production of the first thin strip after changing specifications, and improves the coiling quality and production efficiency of thin strip. Attached Figure Description

[0017] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A schematic diagram of the overall structure of a hot rolling production line according to an embodiment of the present invention is shown; Figure 2 A schematic flowchart of a strip tail control method according to an embodiment of the present invention is shown; Figure 3 A schematic diagram of a strip tail control device according to an embodiment of the present invention is shown. Detailed Implementation

[0018] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0019] To better understand the technical solution of this invention, a hot rolling production line will be introduced first, such as... Figure 1 The hot rolling production line shown is arranged in sequence along the strip running direction as follows: finishing mill stand, layer cooling roller table 11, pinch rolls, coiling aid rolls and coiler; the finishing mill stand includes 7 stands, namely the first finishing mill stand F1, the second finishing mill stand F2, the third finishing mill stand F3, the fourth finishing mill stand F4, the fifth finishing mill stand F5, the sixth finishing mill stand F6 and the seventh finishing mill stand F7.

[0020] The coiler comprises multiple coilers, with a first coiler DC1, a second coiler DC2, and a third coiler DC3 arranged along the strip running direction. Each coiler is equipped with a pinch roller at its inlet. The pinch roller corresponding to the first coiler is 12, the pinch roller corresponding to the second coiler is 13, and the pinch roller corresponding to the third coiler is 14. Each coiler is also equipped with a hot metal detector at its inlet. The hot metal detector installed on the first coiler is 21, the hot metal detector installed on the second coiler is 22, and the hot metal detector installed on the third coiler is 23.

[0021] Each winding machine is equipped with an auxiliary winding roller and a mandrel. The first winding machine has an auxiliary winding roller number 15, the first winding machine has a mandrel number 16, the second winding machine has an auxiliary winding roller number 17, the second winding machine has a mandrel number 18, the third winding machine has an auxiliary winding roller number 19, and the second winding machine has a mandrel number 210. The distance between any two adjacent winding machines is 10m.

[0022] To ensure proper strip winding after the strip is discarded on the F7 stand, and to avoid tail-end arching issues caused by abnormal mandrel speed during the first roll of a thinner strip when changing specifications, this invention provides a strip tail control method, such as... Figure 2 As shown, the method includes the following steps: S210, control the rolls of the finishing mill stand, the layer cooling roll table, the pinch rolls, the coiling aid rolls, the mandrel of the target coiler and the strip to run at synchronous speed, and perform tension control on the strip between the rolls and mandrel of the seventh finishing mill stand.

[0023] First, control the rolls, cooling rollers, pinch rolls, coiling aid rolls, mandrel of the target coiler, and strip to run at synchronous speeds, and then perform tension control on the strip between the rolls and mandrel of the seventh finishing mill stand. The target coiler can be any one or more of all coilers.

[0024] When tension control is applied to the strip between the rolls and mandrel of the seventh finishing mill stand, the tension is maintained by the pulling action of the rolls feeding the strip and the mandrel winding the strip, so that the strip from the F7 stand exit to the winding area remains in a preset tension state, thus preventing the strip from becoming loose and piling up.

[0025] The tension setting values ​​used for tension control are issued by the secondary process control system. The strip is usually divided into 6 tension sections along its length, with different tension setting values ​​matched for different positions such as the head, middle, and tail of the strip.

[0026] S211, upon receiving the steel-throwing signal from the fourth finishing mill stand, the layer cooling roller table is controlled to switch from the synchronous speed to the first lag speed; the first lag speed is determined based on the actual running speed of the target coiler mandrel.

[0027] When the tail of the strip leaves the work roll of the fourth finishing mill stand, the fourth finishing mill stand will generate a strip throwing signal. Upon receiving the strip throwing signal from the fourth finishing mill stand, the control layer cold roll table switches from the synchronous speed to the first lagging speed. The first lagging speed is determined according to the actual running speed of the coiler mandrel.

[0028] In one embodiment, the layer cooling roller conveyor includes multiple sets, and controlling the layer cooling roller conveyor to switch from a synchronous speed to a first lagging speed includes: Obtain the speed attenuation coefficient corresponding to each layer of the cold roller conveyor; The first lag speed corresponding to the cold roller conveyor for each layer is determined based on the speed attenuation coefficient corresponding to each layer of the cold roller conveyor and the actual running speed of the target winding machine core shaft. Control the synchronous speed of each layer of cold roller conveyor to switch to its corresponding first lag speed.

[0029] Specifically, considering that the strip tail is prone to tension loss and relaxation after being thrown off the F7 finishing mill stand, which can easily induce tail arch defects, speed lag control is implemented for each group of layer cooling rollers. By adapting the roller speed lag to the actual operating state of the strip, the operating stability of the strip in the layer cooling area is maintained.

[0030] The layered cooling roller conveyor consists of 10 groups, with speed attenuation coefficients ranging from 8% to 22%. Each group of layered cooling roller conveyors has a different speed attenuation coefficient. For example, the speed attenuation coefficient of the first group of layered cooling roller conveyors is 22%, the speed attenuation coefficient of the second group is 21%, the speed attenuation coefficient of the third group is 19%, the speed attenuation coefficient of the fourth group is 18%, the speed attenuation coefficient of the fifth group is 17%, the speed attenuation coefficient of the sixth group is 15%, the speed attenuation coefficient of the seventh group is 14%, the speed attenuation coefficient of the eighth group is 12%, the speed attenuation coefficient of the ninth group is 10%, and the speed attenuation coefficient of the tenth group is 8%.

[0031] The first lag speed corresponding to the cold roller conveyor layer is determined based on the speed attenuation coefficient of each layer and the actual running speed of the target winding machine core shaft, including: According to the formula Determine the first hysteresis speed corresponding to the corresponding layer of cold roller conveyor. ;in, i This refers to the serial number of the layer cooling roller conveyor. For the first i The speed attenuation coefficient corresponding to the multi-layer cold roller conveyor. The actual operating speed of the target winding machine spindle.

[0032] Once the first lag speed of each group of cold roller conveyors is determined, each cold roller conveyor is controlled to switch from the synchronous speed to its corresponding first lag speed.

[0033] After switching to the first lagging speed, it is also necessary to track the tail of the strip. For each set of cold rolls, if the tail of the current coiled strip has passed the set of cold rolls, the cold rolls are switched from the first lagging speed to the idle speed, which is generally 2~5m / s.

[0034] S212, upon receiving the steel-throwing signal from the sixth finishing mill stand, the pinch roll is switched from synchronous speed control mode to negative torque control mode; the coiling roller is controlled to switch from the synchronous speed to the second lagging speed.

[0035] After the F6 strip is ejected from the sixth finishing mill stand, the finishing mill no longer outputs back tension. The original mandrel-driven coiling tension chain is cut off. The thin strip tail in the laminar cooling section has no tension support and is prone to slack and accumulation. Therefore, it is necessary to control the pinch roll negative torque to maintain the strip tension between the exit of the seventh finishing mill stand and the pinch roll with reverse drag torque to ensure the smooth conveying of the strip tail.

[0036] Therefore, when the tail of the strip leaves the work roll of the sixth finishing mill stand, the sixth finishing mill stand will generate a strip throwing signal. Upon receiving the strip throwing signal from the sixth finishing mill stand, the pinch rolls will switch from synchronous speed control mode to negative torque control mode.

[0037] In one implementation, the negative torque corresponding to the negative torque control mode is determined through the following steps: Obtain the strip tension between the rolls and mandrel of the seventh finishing mill stand; The negative torque is determined based on the strip tension and the diameter of the pinch rolls.

[0038] For example, assuming the strip tension between the rolls and mandrel of the seventh finishing mill stand is F, and the pinch roll diameter (working diameter) is... D Then, according to the formula Determine the negative torque.

[0039] After the negative torque is determined, it is sent to the pinch roll drive device to force the output of electromagnetic negative torque opposite to the rotation direction of the pinch roll. At this time, the strip is pulled forward by the coiling mandrel, and the strip drags the pinch roll to rotate passively. The pinch roll motor is in the power generation state and relies on the reverse electromagnetic torque to form a backward dragging resistance on the strip, thereby establishing the strip tension between the exit of the seventh finishing mill stand and the pinch roll.

[0040] Then, the control roller needs to be switched from the synchronous speed to the second lagging speed, specifically according to the formula. Determine the second hysteresis speed corresponding to the corresponding layer of cold roller conveyor. , The speed attenuation coefficient of the auxiliary winding roller is generally taken as 2% to 8%. The actual operating speed of the target winding machine spindle.

[0041] S213, upon receiving the steel throwing signal from the seventh finishing mill stand, acquire the actual speed and the fixed tail speed of the current coiled strip; determine the first deceleration distance of the current coiled strip on the cold strip table based on the actual speed, the fixed tail speed, the length of the cold strip table, and the distance between the current coiled strip and the pinch roll.

[0042] Upon receiving the steel throwing signal from the seventh finishing mill stand, the actual speed and the fixed tail speed of the current coiled strip are obtained; based on the actual speed, the fixed tail speed, the length of the laminar flow table, and the distance between the current coiled strip and the pinch rolls, the first deceleration distance of the current coiled strip on the laminar flow table is determined.

[0043] In one embodiment, the coiler includes multiple coilers, and determines a first deceleration distance of the current strip on the cooling roller table based on the actual speed of the current strip, the fixed tail speed of the current strip, the length of the laminar flow cooling roller table, and the distance between the current strip and the pinch rolls, including: The available distance is determined based on the length of the cooling roller table, the distance between the current coiled strip and the pinch rolls, and the distance between the target coiler and the first coiler in the direction of strip travel. The second deceleration distance corresponding to the completion of deceleration of the coiling machine mandrel is determined based on the current actual speed of the coiled strip, the current fixed tail speed of the coiled strip, and the preset strip tail deceleration rate. The first deceleration distance is determined based on the available distance and the second deceleration distance; the first deceleration distance is the difference between the available distance and the second deceleration distance.

[0044] In one embodiment, determining the available distance based on the length of the cooling roller table, the distance between the current coiled strip and the pinch rolls, and the distance between the target coiler and the first coiler in the strip's running direction includes: According to the formula Determine available distance S 2; among which, S 1 represents the length (total length) of the layer cooling roller conveyor. m The distance between the target coiler and the first coiler in the strip's running direction. n This is the distance between the current coil (tail end) and the pinch roll; If the target coiler is the first coiler in the strip running direction, the distance between the target coiler and the first coiler in the strip running direction is 0; If the target coiler is the second coiler in the strip running direction, the distance between the target coiler and the first coiler in the strip running direction is 10m; If the target coiler is the third coiler in the strip running direction, the distance between the target coiler and the first coiler in the strip running direction is 20m.

[0045] Among them, the distance between the current coiled strip (tail end) and the pinch rolls n The value range is 10~15m; the length of the layer cold roller conveyor S 1 represents the distance between the center of the lower work roll of the seventh finishing mill stand and the center of the lower pinch roll of the first coiler DC1. S 1 is generally 150 meters; In one embodiment, determining the second deceleration distance corresponding to the completion of deceleration of the coiler mandrel based on the current actual speed of the coiled strip, the current fixed tail speed of the coiled strip, and a preset strip tail deceleration rate includes: According to the formula Determine the second deceleration distance S 2; among which, V 1 represents the current actual speed of the coiled steel. V This is the current tail speed of the coiled steel. a This refers to the reduction rate at the tail of the strip. Currently, the fixed tail speed of coiled strip is generally 4.2~5.0m / s, and the reduction rate at the tail of the strip is 0.5~0.9mm / s.

[0046] In this invention, the actual speed of the current strip is determined based on the linear velocity of the work rolls on the seventh finishing mill stand and the forward slip coefficient. The forward slip coefficient is the ratio of the actual strip exit speed to the linear velocity of the work roll surface. That is, it can be determined according to the formula... Determine the actual speed of the current coiled strip. , The linear velocity of the work rolls on the seventh finishing mill stand. This is the forward sliding value, expressed as a percentage, for example, 5%.

[0047] After determining the available distance and the second deceleration distance, the first deceleration distance is determined based on the available distance and the second deceleration distance. That is, it can be determined using the formula... Determine the first deceleration distance .

[0048] S214, The actual running speed of the target coiler core shaft is controlled according to the first deceleration distance of the current coiled strip on the cooling roller table, so as to match the deceleration timing of the target coiler core shaft with the position of the tail of the current coiled strip.

[0049] After the first deceleration distance is determined, the actual running speed of the target coiler core shaft is controlled according to the first deceleration distance of the current strip on the cooling roller table, so as to match the deceleration timing of the coiler core shaft with the position of the tail of the current strip.

[0050] In one embodiment, controlling the actual running speed of the target coiler mandrel based on the first deceleration distance of the current coiled strip on the de-icing roller table includes: If the first deceleration distance is greater than 0, the mandrel of the target coiler is controlled to run the first distance at the actual speed of the current coiled strip, and then the mandrel of the target coiler is controlled to reduce from the actual speed of the current coiled strip to the fixed tail speed of the current coiled strip based on the deceleration rate of the strip tail. When the tail of the current coiled steel passes the hot metal detector at the entrance of the target coiler, the mandrel of the target coiler is triggered to perform tail-fixing control on the current coiled steel.

[0051] In one embodiment, controlling the actual running speed of the target coiler mandrel based on the first deceleration distance of the current coiled strip on the de-icing roller table includes: If the first deceleration distance is less than or equal to 0, the mandrel of the target coiler is reduced from the actual speed of the current coiled strip to the fixed tail speed of the current coiled strip based on the deceleration rate of the strip tail. When the tail of the current coiled steel passes the hot metal detector at the entrance of the target coiler, the mandrel of the target coiler is triggered to perform tail-fixing control on the current coiled steel.

[0052] Specifically, when the first deceleration distance... A value greater than 0 indicates that the target coiler mandrel still has spare travel for high-speed operation. Therefore, the target coiler mandrel is controlled to run at the actual speed of the current coiled strip for the first distance, and then decelerate to the fixed tail speed of the current coiled strip according to the set deceleration rate. This can delay the deceleration time of the mandrel as much as possible, avoid premature deceleration of the mandrel causing the strip in the cooling section to lose tension and become loose, and at the same time ensure that the mandrel has been reduced to the required fixed tail speed before the tail of the strip reaches the hot metal detector at the coiling inlet, ensuring the normal execution of the subsequent fixed tail process.

[0053] When the first deceleration distance A value less than or equal to 0 indicates that there is no margin for continued high-speed operation. Therefore, when the steel throwing signal of the seventh finishing mill stand is received, the speed will immediately begin to decelerate until it reaches the current tail speed of the coiled strip, prioritizing the availability of the tail function.

[0054] By optimizing the coordinated speed control logic of the coiler mandrel, auxiliary coiling rolls, pinch rolls, and laminar flow rollers, the timing of mandrel deceleration is dynamically calculated based on the actual travel position of the strip tail after the strip is thrown on the seventh finishing mill stand. The uniform speed running range and deceleration stroke are reasonably allocated so that the timing of the mandrel deceleration of the core coiler is matched with the position of the strip tail. This avoids premature deceleration of the mandrel, which can cause strip tension loss and slack. It effectively solves the problem of strip tail arching that is prone to occur in the production of the first thin strip after changing specifications, and improves the coiling quality and production efficiency of thin strip.

[0055] Based on the same inventive concept as in the foregoing embodiments, this embodiment also provides a steel strip tail control device, such as... Figure 3 As shown, the device includes: The first control unit 31 is used to control the rolls of the finishing mill stand, the layer cooling roll table, the pinch rolls, the coiling rolls, the mandrel of the coiler and the strip to run at synchronous speed, and to perform tension control on the strip between the rolls and the mandrel of the seventh finishing mill stand; The second control unit 32 is used to control the layer cooling roller table to switch from the synchronous speed to the first lagging speed when it receives the steel throwing signal of the fourth finishing mill stand; the first lagging speed is determined according to the actual running speed of the coiler mandrel; The switching unit 33 is used to switch the pinch roll from synchronous speed control mode to negative torque control mode when it receives the steel throwing signal from the sixth finishing mill stand. The determining unit 34 is used to obtain the actual speed and the fixed tail speed of the current coiled strip when receiving the steel throwing signal from the seventh finishing mill stand; and to determine the first deceleration distance of the current coiled strip on the cooling roller table based on the actual speed, the fixed tail speed, the length of the laminar flow table, and the distance between the current coiled strip and the pinch roll. The third control unit 35 is used to control the actual running speed of the target coiler mandrel according to the first deceleration distance of the current coiled strip on the cooling roller table, so as to match the deceleration timing of the coiler mandrel with the position of the tail of the current coiled strip.

[0056] Since the apparatus described in the embodiments of this invention is used to implement the strip tail control method of the embodiments of this invention, those skilled in the art can understand the specific structure and variations of the apparatus based on the method described in the embodiments of this invention, and therefore will not be described in detail here. All apparatuses used in the methods of the embodiments of this invention fall within the scope of protection of this invention.

[0057] Based on the same inventive concept, this embodiment provides a computer device, including a memory, a processor, and a computer program stored on and executable thereon, wherein the processor executes the computer program to implement any step of the method described above.

[0058] Through one or more embodiments of the present invention, the present invention has the following beneficial effects or advantages: This invention provides a strip tail control method, device, and computer equipment, applied in a hot rolling production line. The hot rolling production line is arranged sequentially along the strip running direction as follows: a finishing mill stand, a cooling roller table, pinch rolls, coiling aid rolls, and a coiler; the finishing mill stand includes seven stands; the method includes: controlling the rolls of the finishing mill stand, the cooling roller table, the pinch rolls, the coiling aid rolls, the mandrel of the target coiler, and the strip to run at synchronous speeds, and performing tension control on the strip between the rolls and the mandrel of the seventh finishing mill stand; Upon receiving a steel-throwing signal from the fourth finishing mill stand, the cooling roller table is controlled to switch from the synchronous speed to a first delayed speed; the first delayed speed is determined based on the actual operating speed of the target coiler mandrel. Upon receiving a steel-throwing signal from the sixth finishing mill stand, the pinch rolls are switched from synchronous speed control mode to negative torque control mode; the auxiliary coiling rolls are controlled to switch from the synchronous speed to a second delayed speed. Upon receiving a steel-throwing signal from the seventh finishing mill stand, the actual speed and tail speed of the current coiled strip are acquired; based on the actual speed, tail speed, length of the cooling roller table, and distance between the current coiled strip and the pinch rolls, the first deceleration distance of the current coiled strip on the cooling roller table is determined; the actual operating speed of the target coiler mandrel is controlled based on the first deceleration distance of the current coiled strip on the cooling roller table to match the deceleration timing of the target coiler mandrel with the position of the tail of the current coiled strip; thus, through... The coordinated speed control logic of the coiler mandrel, auxiliary coiling roll, pinch roll, and laminar flow roller is optimized. After the strip is thrown off the seventh finishing mill stand, the timing of the mandrel deceleration is dynamically calculated based on the actual travel position of the strip tail. The uniform speed running range and deceleration stroke are reasonably allocated so that the timing of the deceleration of the mandrel of the coiler is matched with the position of the strip tail. This avoids premature deceleration of the mandrel, which can cause strip tension loss and slack. It effectively solves the problem of strip tail arching that is prone to occur in the production of the first thin strip after changing specifications, and improves the coiling quality and production efficiency of thin strip.

[0059] The algorithms and displays provided herein are not inherently related to any particular computer, virtual system, or other device. Various general-purpose systems can also be used in conjunction with the teachings herein. The required structure for constructing such systems is apparent from the above description. Furthermore, this invention is not directed to any particular programming language. It should be understood that the contents of the invention described herein can be implemented using various programming languages, and the above description of specific languages ​​is for the purpose of disclosing the best mode of implementation of the invention.

[0060] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0061] Similarly, it should be understood that, in order to simplify this disclosure and aid in understanding one or more of the various aspects of the invention, in the above description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof. However, this method of disclosure should not be construed as reflecting an intention that the claimed invention requires more features than are expressly recited in each claim. Rather, as reflected in the following claims, inventive aspects lie in fewer than all features of a single foregoing disclosed embodiment. Therefore, the claims following the detailed description are hereby expressly incorporated into this detailed description, wherein each claim itself is a separate embodiment of the invention.

[0062] Those skilled in the art will understand that modules in the device of the embodiments can be adaptively changed and placed in one or more devices different from that embodiment. Modules, units, or components in the embodiments can be combined into a single module, unit, or component, and further, they can be divided into multiple sub-modules, sub-units, or sub-components. Except where at least some of such features and / or processes or units are mutually exclusive, any combination can be used to combine all features disclosed in this specification (including the accompanying claims, abstract, and drawings) and all processes or units of any method or device so disclosed. Unless expressly stated otherwise, each feature disclosed in this specification (including the accompanying claims, abstract, and drawings) may be replaced by an alternative feature that serves the same, equivalent, or similar purpose.

[0063] Furthermore, those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of the invention and form different embodiments. For example, in the following claims, any of the claimed embodiments can be used in any combination.

[0064] The various component embodiments of the present invention can be implemented in hardware, or as software modules running on one or more processors, or a combination thereof. Those skilled in the art will understand that microprocessors or digital signal processors (DSPs) can be used in practice to implement some or all of the functions of some or all of the components of the gateway, proxy server, or system according to embodiments of the present invention. The present invention can also be implemented as a device or apparatus program (e.g., a computer program and computer program product) for performing part or all of the methods described herein. Such programs implementing the present invention can be stored on a computer-readable medium or can be in the form of one or more signals. Such signals can be downloaded from an Internet website, provided on a carrier signal, or provided in any other form.

[0065] It should be noted that the above embodiments are illustrative of the invention and not restrictive, and that those skilled in the art can devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses should not be construed as limiting the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention can be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc., does not indicate any order. These words can be interpreted as names.

[0066] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0067] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for controlling the tail section of a strip steel, characterized in that, In a hot rolling production line, the hot rolling production line is sequentially arranged along the strip running direction as follows: a finishing mill stand, a layer cooling roller table, pinch rolls, coiling aid rolls, and a coiler; the finishing mill stand includes 7 stands; the method includes: The rolls of the finishing mill stand, the layer cooling roll table, the pinch rolls, the coiling aid rolls, the mandrel of the target coiler, and the strip are controlled to run at synchronous speed, and tension control is performed on the strip between the rolls and the mandrel of the seventh finishing mill stand; Upon receiving a steel-throwing signal from the fourth finishing mill stand, the layer cooling roller table is controlled to switch from the synchronous speed to the first lagging speed; the first lagging speed is determined based on the actual operating speed of the target coiler mandrel. Upon receiving a steel-throwing signal from the sixth finishing mill stand, the pinch roll is switched from synchronous speed control mode to negative torque control mode; the coiling aid roll is controlled to switch from synchronous speed to second lagging speed. Upon receiving the steel throwing signal from the seventh finishing mill stand, the actual speed and the fixed tail speed of the current coiled strip are obtained; based on the actual speed, the fixed tail speed, the length of the laminar flow table, and the distance between the current coiled strip and the pinch roll, the first deceleration distance of the current coiled strip on the laminar flow table is determined. The actual running speed of the target coiler mandrel is controlled based on the first deceleration distance of the current coiled strip on the cooling roller table, so that the deceleration timing of the target coiler mandrel matches the position of the tail of the current coiled strip.

2. The method as described in claim 1, characterized in that, The layer cooling roller conveyor includes multiple sets, and controlling the layer cooling roller conveyor to switch from the synchronous speed to the first lagging speed includes: Obtain the speed attenuation coefficient corresponding to each layer of the cold roller conveyor; The first lag speed corresponding to the cold roller conveyor layer is determined based on the speed attenuation coefficient corresponding to each layer of the cold roller conveyor and the actual running speed of the target winding machine core shaft. The synchronous speed of each layer of the cold roller conveyor is switched to its corresponding first lag speed.

3. The method as described in claim 1, characterized in that, The negative torque in the negative torque control mode is determined through the following steps: Obtain the strip tension between the rolls and mandrel of the seventh finishing mill stand; The negative torque is determined based on the strip tension and the diameter of the pinch roll.

4. The method as described in claim 1, characterized in that, The coiler includes multiple coils. Determining the first deceleration distance of the current strip on the cooling roller table based on the actual speed of the current strip, the fixed tail speed of the current strip, the length of the laminar flow cooling roller table, and the distance between the current strip and the pinch roll includes: The available distance is determined based on the length of the cold roll table, the distance between the current coiled strip and the pinch roll, and the distance between the target coiler and the first coiler in the strip running direction. The second deceleration distance corresponding to the completion of deceleration of the target coiler mandrel is determined based on the actual speed of the current coiled strip, the fixed tail speed of the current coiled strip, and the preset strip tail deceleration rate. The first deceleration distance is determined based on the available distance and the second deceleration distance; the first deceleration distance is the difference between the available distance and the second deceleration distance.

5. The method as described in claim 4, characterized in that, The determination of the available distance based on the length of the layered cooling roller table, the distance between the current coiled strip and the pinch roll, and the distance between the target coiler and the first coiler in the strip running direction includes: According to the formula Determine the available distance S 2; among which, S1 is the length of the layer cold roller conveyor. m The distance between the target coiler and the first coiler in the strip running direction, the n The distance between the current coiled strip and the pinch roll; If the target coiler is the first coiler in the strip running direction, the distance between the target coiler and the first coiler in the strip running direction is 0; If the target coiler is the second coiler in the strip running direction, the distance between the target coiler and the first coiler in the strip running direction is 10m; If the target coiler is the third coiler in the strip running direction, the distance between the target coiler and the first coiler in the strip running direction is 20m.

6. The method as described in claim 4, characterized in that, The step of determining the second deceleration distance corresponding to the completion of deceleration of the target coiler mandrel based on the actual speed of the current coiled strip, the fixed tail speed of the current coiled strip, and the preset strip tail deceleration rate includes: According to the formula Determine the second deceleration distance S 2; among which, The V 1 represents the actual speed of the current coiled steel. V The current tail speed of the coiled steel is the constant speed. a The reduction rate at the tail of the strip is denoted as .

7. The method as described in claim 1, characterized in that, The control of the actual running speed of the target coiler mandrel based on the first deceleration distance of the current coiled strip on the cooling roller table includes: If the first deceleration distance is greater than 0, the mandrel of the target coiler is controlled to run the first distance at the actual speed of the current coiled strip, and then the mandrel of the target coiler is controlled to reduce from the actual speed of the current coiled strip to the fixed tail speed of the current coiled strip based on the deceleration rate of the strip tail. When the tail of the current coiled strip passes the hot metal detector at the entrance of the target coiler, the mandrel of the target coiler is triggered to perform tail-fixing control on the current coiled strip.

8. The method as described in claim 1, characterized in that, The control of the actual running speed of the target coiler mandrel based on the first deceleration distance of the current coiled strip on the cooling roller table includes: If the first deceleration distance is less than or equal to 0, the mandrel of the target coiler is controlled to decrease from the actual speed of the current coiled strip to the fixed tail speed of the current coiled strip based on the strip tail deceleration rate control. When the tail of the current coiled strip passes the hot metal detector at the entrance of the target coiler, the mandrel of the target coiler is triggered to perform tail-fixing control on the current coiled strip.

9. A steel-belt tail control device, characterized in that, In a hot rolling production line, the hot rolling production line is sequentially arranged along the strip running direction as follows: a finishing mill stand, a layer cooling roller table, pinch rolls, coiling aid rolls, and a coiler; the device includes: The first control unit is used to control the rolls of the finishing mill stand, the laminar flow table, the pinch rolls, the coiling aid rolls, the mandrel of the target coiler, and the strip to run at synchronous speed, and to perform tension control on the strip between the rolls and the mandrel of the seventh finishing mill stand; The second control unit is used to control the layer cooling roller table to switch from the synchronous speed to the first lagging speed when a steel throwing signal is received from the fourth finishing mill stand; the first lagging speed is determined according to the actual running speed of the target coiler mandrel; The switching unit is used to switch the pinch roll from synchronous speed control mode to negative torque control mode when it receives the steel throwing signal from the sixth finishing mill stand. The determining unit is used to obtain the actual speed and the fixed tail speed of the current coiled strip when receiving the steel throwing signal from the seventh finishing mill stand; and to determine the first deceleration distance of the current coiled strip on the cooling roller table based on the actual speed, the fixed tail speed, the length of the laminar flow table, and the distance between the current coiled strip and the pinch roll. The third control unit is used to control the actual running speed of the target coiler mandrel based on the first deceleration distance of the current coiled strip on the cooling roller table, so as to match the deceleration timing of the target coiler mandrel with the position of the tail of the current coiled strip.

10. A computer 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 the steps of the method according to any one of claims 1-8.

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