A tension roller group control method and device of a silicon steel cold continuous rolling mill train

Abstract

The application discloses a tension roller group control method and device of a silicon steel cold continuous rolling mill train, and is applied to the silicon steel cold continuous rolling mill train. The method comprises the following steps: according to the rotating speed of the tension roller group, the current given value of each tension roller in the tension roller group is corrected in real time, so as to balance the load of each tension roller; during a preset time period when the coiler performs slitting operation, according to the strip linear velocity at the outlet of the last stand and the rolling speed of the last stand, the rotating speed of the tension roller group is corrected; wherein the last stand is the last stand of the rolling mill train; if the roller body slip phenomenon occurs in the tension roller group, the current given value of the slip roller at the slip moment is locked, and the slip phenomenon disappears until the slip phenomenon disappears. The method cooperates from three dimensions of load balancing, slitting disturbance inhibition and slip control, comprehensively improves the running stability and load balancing of the tension roller group under various working conditions, and effectively avoids the over flow, strip breakage and product quality defects caused by the abnormal running of the tension roller.

Description

Technical Field

[0001] This invention relates to the field of silicon steel cold rolling technology, and particularly to a tension roll group control method and device for a silicon steel cold rolling mill. Background Technology

[0002] Currently, due to its advantages such as high production efficiency, high yield, and good stability in product thickness and shape control, the cold continuous rolling mill for silicon steel is gradually replacing single-stand rolling mills and is widely used in the production of medium and high grade non-oriented silicon steel and some oriented silicon steel.

[0003] In the cold continuous rolling process of silicon steel, in order to meet the rolling process's requirements for post-tension, tension roll sets are usually installed between the mill exit and the coiler to establish and maintain a stable exit tension. Conventional tension roll sets typically consist of multiple rolls, each with basically the same diameter, material, and strip wrap angle. Tension and speed are adjusted through a dual closed-loop control mode of speed and current.

[0004] However, in actual production applications, conventional tension roll group control methods still have some technical problems. For example, during the rolling process, the main rolls near the mill side of the tension roll group often experience overflow, affecting the stable operation of the equipment. As the rolling process continues, when a roll slips due to a decrease in the coefficient of friction, it may cause the actual rotational speed of each roll to be inconsistent, leading to control imbalance, resulting in strip breakage and surface quality defects in batches of strip steel.

[0005] Therefore, how to further improve the speed stability of the tension roll group of the silicon steel cold rolling mill under various working conditions and avoid strip breakage and product quality defects caused by abnormal operation of the tension roll has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] To improve the speed stability and load balance of tension rolls under various working conditions, this invention provides a tension roll control method and device for a silicon steel cold rolling mill.

[0007] In a first aspect, embodiments of the present invention provide a tension roll group control method for a silicon steel cold continuous rolling mill, applicable to a silicon steel cold continuous rolling mill, wherein the silicon steel cold continuous rolling mill includes a rolling mill group, a tension roll group, and a coiler connected in sequence, and the method may include: The current setpoint of each tension roller in the tension roller group is corrected in real time according to the rotation speed of the tension roller group in order to balance the load of each tension roller. During a preset time period when the coiler performs the slitting operation, the rotational speed of the tension roll group is adjusted according to the strip speed at the exit of the last stand and the speed of the rolls in the last stand; wherein, the last stand is the last stand of the rolling mill group; If slippage occurs in the tension roller group, the current setpoint of the slipping roller at the moment of slippage is locked until the slippage disappears.

[0008] In one or more optional embodiments of this application, the step of real-time correction of the current setpoint of each tension roller in the tension roller group according to the rotational speed of the tension roller group to balance the load of each tension roller includes: Based on the rotational speed of the tension roller group, a preset speed-current correction table is consulted in real time to determine the current correction value corresponding to each tension roller in the tension roller group. For each tension roller, the current setpoint of the tension roller is corrected according to the current correction value corresponding to the tension roller.

[0009] In one or more optional embodiments of this application, the preset speed-current correction table is obtained in the following manner: Based on the maximum speed of the tension rollers in the tension roller group, multiple test speeds are determined; The tension roller assembly is controlled to perform an idle test at each of the test speeds to obtain the average current of each tension roller at each of the test speeds. Based on the average current of each tension roller at each test speed, the average current of all tension rollers at each test speed is obtained; For each test speed and each tension roller, the difference between the average current of the tension roller at that test speed and the average current of all tension rollers at that test speed is used as the current correction value of the tension roller at that test speed. The preset speed-current correction table is obtained based on the current correction value of each tension roller at each test speed.

[0010] In one or more optional embodiments of this application, the step of adjusting the rotational speed of the tension roller group according to the strip speed at the end stand exit and the speed of the end stand rolls during a preset time period when the coiler performs the slitting operation includes: During a preset time period when the coiler performs the slitting operation, the forward slip value is obtained based on the strip line speed and the speed of the last stand rolls; Switch the control mode of the tension roller group from the speed-current dual closed-loop control mode to the speed loop control mode; The rotational speed correction value is determined based on the forward slip value and the strip thickness. The rotational speed of the tension roller assembly is adjusted according to the rotational speed correction value.

[0011] In one or more optional embodiments of this application, determining the speed correction value based on the forward slip value and the strip thickness includes: Determine the thickness compensation coefficient based on the strip thickness; The rotational speed correction value is determined based on the forward slip value, the strip thickness, and the thickness compensation coefficient.

[0012] In one or more optional embodiments of this application, the step of locking the current setpoint at the moment of slippage of the slipping roller when slippage occurs in the tension roller group, until the slippage disappears, includes: If slippage occurs in the tension roller group, the current setpoint at the moment when the slipping roller is confirmed to be slipping is taken as the target current value. Based on the current setpoint of the slipping roller and the target current value, the reverse current correction value is obtained; The reverse current correction value is coupled to the current setpoint of the slipping roller to obtain the current execution value; The slippage roller is controlled based on the current value until the slippage of the roller body disappears.

[0013] In one or more optional embodiments of this application, the occurrence of roller slippage in the tension roller group is determined by the following method: The average rotational speed of all tension rollers in the tension roller group is determined as the average rotational speed. If the deviation of the rotational speed of any tension roller in the tension roller group from the average rotational speed is greater than a preset deviation threshold, it is determined that the tension roller group has experienced roller slippage.

[0014] In a second aspect, embodiments of the present invention provide a tension roll group control device for a silicon steel cold rolling mill, which may include: The first correction module is used to correct the current setpoint of each tension roller in the tension roller group in real time according to the rotation speed of the tension roller group, so as to balance the load of each tension roller. The second correction module is used to correct the rotational speed of the tension roll group based on the strip speed at the exit of the last stand and the speed of the rolls of the last stand during a preset time period when the coiler performs the slitting operation; wherein the last stand is the last stand of the rolling mill group. The slippage control module is used to lock the current setpoint of the slipping roller at the moment of slippage if slippage occurs in the tension roller group, until the slippage disappears.

[0015] Thirdly, embodiments of the present invention provide a computer-readable storage medium having a computer program / instruction stored thereon, which, when executed by a processor, implements the tension roll group control method of the silicon steel cold rolling mill as described above.

[0016] Fourthly, embodiments of the present invention provide a computer program product, including a computer program / instruction, which, when executed by a processor, implements the tension roll group control method of the silicon steel cold rolling mill as described above.

[0017] Fifthly, embodiments of the present invention provide a computer device, including a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the tension roll group control method of the silicon steel cold rolling mill as described above.

[0018] The beneficial effects of the above-described technical solutions provided in the embodiments of the present invention include at least the following: This invention provides a tension roll group control method for a silicon steel cold rolling mill. This method effectively compensates for load imbalances caused by differences in mechanical wear among the tension rolls by real-time correction of the current setpoint for each tension roll based on the rotational speed of the tension roll group. This prevents individual tension rolls from operating under prolonged overload. Furthermore, during a preset time period in the coiler slitting operation, the tension roll group rotational speed is corrected based on the strip speed at the last stand exit and the speed of the last stand rolls. This maintains speed stability even when tension disappears at the moment of slitting, preventing strip breakage due to speed loss. Moreover, when roll slippage is detected, the current setpoint at the moment of slippage is locked until the slippage disappears, breaking the vicious cycle of continuous acceleration of the slipping roll under existing control methods, effectively suppressing slippage and preventing scratches on the strip surface. This method works synergistically from three dimensions: load balancing, slitting disturbance suppression, and slippage control, comprehensively improving the operational stability and load balance of the tension roll group under various operating conditions, effectively avoiding overcurrent, strip breakage, and product quality defects caused by abnormal tension roll operation.

[0019] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings.

[0020] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0021] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 A schematic flowchart illustrating the tension roll group control method for a silicon steel cold rolling mill provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of a silicon steel cold rolling mill provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the tension roller group speed correction process during slitting provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the current setpoint correction process for the slippage roller provided in an embodiment of the present invention; Figure 5 A schematic diagram of the tension roll group control device of the silicon steel cold rolling mill provided in an embodiment of the present invention. Detailed Implementation

[0022] 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.

[0023] The inventors discovered that conventional tension roll group control methods in the prior art still have some technical problems. For example, during the rolling process, overflow often occurs on the main rolls near the mill side of the tension roll group, affecting the stable operation of the equipment. As the rolling process continues, when a roll slips due to a decrease in the coefficient of friction, it may cause inconsistencies in the actual rotational speeds of the rolls, leading to control imbalance, strip breakage, and surface quality defects in batches of strip steel. Based on this, the inventors, through further research and development, have created this invention, providing a tension roll group control method and device for a silicon steel cold continuous rolling mill.

[0024] Example 1 This invention provides a tension roll group control method for a silicon steel cold rolling mill, applicable to a silicon steel cold rolling mill. The silicon steel cold rolling mill adopts a speed-current dual closed-loop control mode. The silicon steel cold rolling mill includes a rolling mill, a tension roll group, and a coiler connected in sequence. The method refers to... Figure 1 As shown, the method may include the following steps S101-S103: S101: Adjusts the current setpoint of each tension roller in the tension roller group in real time according to the rotation speed of the tension roller group, so as to balance the load of each tension roller.

[0025] S102: During the preset time period when the coiler performs the slitting operation, the rotational speed of the tension roll group is adjusted according to the strip speed at the exit of the last stand and the speed of the rolls in the last stand. The last stand is the last stand of the rolling mill.

[0026] S103: If slippage occurs in the tension roller group, lock the current setpoint of the slipping roller at the moment of slippage until the slippage disappears.

[0027] This invention provides a tension roll group control method for a silicon steel cold rolling mill. This method effectively compensates for load imbalances caused by differences in mechanical wear among the tension rolls by real-time correction of the current setpoint for each tension roll based on the rotational speed of the tension roll group. This prevents individual tension rolls from operating under prolonged overload. Furthermore, during a preset time period in the coiler slitting operation, the tension roll group rotational speed is corrected based on the strip speed at the last stand exit and the speed of the last stand rolls. This maintains speed stability even when tension disappears at the moment of slitting, preventing strip breakage due to speed loss. Moreover, when roll slippage is detected, the current setpoint at the moment of slippage is locked until the slippage disappears, breaking the vicious cycle of continuous acceleration of the slipping roll under existing control methods, effectively suppressing slippage and preventing scratches on the strip surface. This method works synergistically from three dimensions: load balancing, slitting disturbance suppression, and slippage control, comprehensively improving the operational stability and load balance of the tension roll group under various operating conditions, effectively avoiding overcurrent, strip breakage, and product quality defects caused by abnormal tension roll operation.

[0028] To facilitate understanding of this method by those skilled in the art, a brief introduction is provided below, with reference to schematic diagrams, of the silicon steel cold rolling mill unit, including the rolling mill group, tension roll group, and coiler, as well as the speed and current dual closed-loop control mode: Reference Figure 2 As shown, the silicon steel cold continuous rolling mill unit includes, from left to right, the strip running direction, a rolling mill group, a tension roll group, and a coiler. The rolling mill group consists of multiple stands, and a laser velocimeter is installed at the exit of the last stand to measure the strip linear speed in real time.

[0029] The tension roll assembly is located between the rolling mill and the coiler, and typically consists of four rolls. Figure 2 BR1, BR2, BR3, and BR4 are used to establish and maintain the stable tension required at the mill exit. In one specific embodiment, the tension roll group consists of four steel rolls with a diameter of 800 mm.

[0030] The guide rollers guide the strip's running direction, and the slitting shear is located in front of the coiler to perform strip slitting operations after coiling is completed. The coiler is used to coil the rolled strip into a steel coil. In addition, tension gauges are installed between the rolling mill and the tension roller group, and between the tension roller group and the coiler, to monitor the strip tension in each section in real time.

[0031] In existing tension roll control modes, tension roll groups typically employ a dual-loop control mode combining speed and current. The speed loop (Automatic Speed ​​Regulator, ASR) uses the strip speed detected by a laser tachometer as feedback to perform closed-loop regulation of the tension roll group's operating speed. The current loop (Automatic Current Regulator, ACR) uses the actual current of each tension roll motor as feedback to precisely control the motor current, thus controlling the output of each tension roll. The current setpoint of the current loop primarily originates from the output of the speed loop, on which a tension compensation current is superimposed. Specifically, when there is a deviation between the actual tension at the mill exit and the set tension, proportional-integral calculations are performed to obtain the tension compensation current setpoint. This compensation current setpoint, together with the base current value output by the speed loop, constitutes the final setpoint of the current loop. The current loop, as an inner loop, is nested within the speed loop, forming a dual-loop control structure that enables speed regulation and tension control of the tension roll group.

[0032] In step S101 above, the current setpoint of each tension roller in the tension roller group is corrected in real time according to the rotational speed of the tension roller group to balance the load of each tension roller. Specifically, this includes the following steps S1011-S1012: In existing technologies, tension roll groups typically match the motor power of each tension roll according to a distribution pattern of increasing or decreasing tension; that is, tension rolls closer to the mill side are configured with higher power, while those closer to the coiler side are configured with lower power. However, although the transmission components and roll body design parameters are basically the same, the mechanical losses of each tension roll during actual operation still vary significantly due to factors such as manufacturing tolerances, installation accuracy, and bearing wear. This difference results in different currents required by each tension roll to overcome mechanical losses at the same given rotational speed. Even if the motor power is matched according to the tension distribution, it is still difficult to achieve precise power balance, which can easily lead to overload or insufficient output of individual tension rolls.

[0033] To address this technical problem, the embodiments of this application correct the current setpoint of each tension roller in the tension roller group through the following steps S1011-S1012, so as to balance the load of each tension roller.

[0034] S1011: Based on the rotational speed of the tension roller group, query the preset speed-current correction table in real time to determine the current correction value corresponding to each tension roller in the tension roller group.

[0035] Specifically, this could involve real-time acquisition of the operating speed of the tension rolls during the operation of a silicon steel cold rolling mill. Based on the acquired speed, a search and matching process is performed in a preset speed-current correction table to determine the corresponding current correction value for each tension roll.

[0036] The speed-current correction table pre-stores the current correction values ​​corresponding to each tension roller under different speed conditions. By looking up the table, the required current correction value for each tension roller at the current speed can be obtained, providing a basis for subsequent current correction operations.

[0037] In this embodiment of the application, the preset speed-current correction table in step S1011 above can be obtained through the following steps S10111-S10115: S10111: Determine multiple test speeds based on the maximum speed of the tension rollers in the tension roller group.

[0038] Specifically, before the silicon steel cold rolling mill is put into operation or after the tension rolls are replaced, multiple speed points within a range can be selected as test speeds based on the highest operating speed (maximum speed) of the tension rolls in the tension roll group. For example, if the maximum speed of the tension rolls in the tension roll group is 1500 mpm, 10 test speeds can be evenly selected within the range of 0 to 1500 mpm, including 150 mpm, 300 mpm, 450 mpm, 600 mpm, 750 mpm, 900 mpm, 1050 mpm, 1200 mpm, 1350 mpm, and 1500 mpm. These test speeds cover the entire operating speed range of the tension roll group and can comprehensively reflect the mechanical wear characteristics of each tension roll at different speeds.

[0039] S10112: Control the tension roller group to perform an idle test at each test speed to obtain the average current of each tension roller at each test speed.

[0040] Specifically, for each test speed, the tension roller assembly can be run stably under no-load conditions without strip load. To ensure the stability of the experimental data, the no-load duration for each test speed should be no less than 20 minutes. The last 5 minutes (e.g., minutes 15-20) of stable operation are recorded, and the actual current values ​​of each tension roller motor are recorded. The average current during this period (e.g., minutes 15-20) is then calculated as the average current of the corresponding tension roller at that test speed. For example, at test speed Vi, the average current values ​​for the four tension rollers BR1, BR2, BR3, and BR4 are I. 1i I 2i I 3i and I 4i .

[0041] S10113: Based on the average current of each tension roller at each test speed, obtain the average current of all tension rollers at each test speed.

[0042] Specifically, for each test speed, the average current of all tension rollers at that test speed can be calculated by performing an arithmetic mean based on the average current of each tension roller at that test speed. For example, for test speed Vi, the average current of the four tension rollers are Ii, ... 1i I 2i I 3i and I 4i Then the average current I of all tension rollers at this test speed avg_i For (I) 1i I 2i I 3i and I 4i ) / 4. This average current reflects the overall average no-load loss level of the tension roller assembly at each test speed.

[0043] S10114: For each test speed and each tension roller, the difference between the average current of the tension roller at the test speed and the average current of all tension rollers at the test speed is used as the current correction value of the tension roller at the test speed.

[0044] Specifically, for each test speed and each tension roller, the difference between the average current of that tension roller and the average current of all tension rollers can be calculated as the current correction value for that tension roller at that test speed. For example, for test speed Vi, the current correction values ​​for the four tension rollers are ΔI... 1i =I 1i -I avg_i ΔI 2i =I 2i -I avg_i ΔI 3i =I 3i -I avg_i ΔI 4i =I 4i -I avg_i .

[0045] A positive current correction value indicates that the mechanical loss of the corresponding tension roller is higher than average, meaning that the tension roller requires a larger current to overcome its greater mechanical resistance when idling. A negative current correction value indicates that the mechanical loss of the corresponding tension roller is lower than average, meaning that the tension roller requires only a smaller current to overcome its mechanical resistance when idling.

[0046] S10115: Based on the current correction value of each tension roller at each test speed, obtain the preset speed-current correction table.

[0047] Specifically, this can be achieved by summarizing and organizing the current correction values ​​of each tension roller at each test speed obtained in step S10114 above, and establishing a reference table indexed by rotational speed and containing the corresponding current correction values ​​of each tension roller, i.e., a preset rotational speed-current correction table. In this preset rotational speed-current correction table, each row corresponds to a test speed, and each column corresponds to the current correction value of a tension roller.

[0048] In actual production, when the tension roller assembly operates at a certain speed, the current correction value corresponding to each tension roller at that speed can be obtained by referring to a table. For intermediate speeds not listed in the table, the current correction value can be determined in two ways: First, using linear interpolation, the current correction value corresponding to the current speed is calculated based on the current correction value of the known test speed; second, using an upward correspondence method, the current speed is assigned to the minimum test speed that is not lower than the current speed, and the current correction value of that test speed is directly used. For example, if the test speeds include 150mpm and 300mpm, when the actual speed is between 150mpm and 300mpm, the current correction value corresponding to 300mpm is directly used. Both methods can achieve real-time correction of the current setpoint of each tension roller, ensuring balanced load on each tension roller.

[0049] S1012: For each tension roller, correct the current setpoint of the tension roller according to the current correction value corresponding to the tension roller.

[0050] Specifically, for each tension roller, the current setpoint calculated by the speed loop is superimposed with the current correction value of the tension roller at the current speed obtained in step S1011 to obtain the corrected current setpoint.

[0051] For example, if the current setpoint for a tension roller at the current speed given by the speed loop is I... base If the current correction value of the tension roller at the current speed is ΔI, then the corrected current setpoint of the tension roller is I. final =I base +ΔI.

[0052] That is, when the current correction value is positive, the corrected current setpoint increases to compensate for the higher mechanical losses of the tension roller; when the current correction value is negative, the corrected current setpoint decreases to accommodate its lower mechanical losses. The corrected current setpoint is sent to the current loop for execution, thereby achieving a balanced distribution of the load on each tension roller and avoiding overload or insufficient output of individual tension rollers due to differences in mechanical losses.

[0053] In this embodiment, step S101 establishes a speed-current correction table to determine the mechanical loss characteristics of each tension roller at different speeds, and corrects the current correction value based on the real-time speed during production. This method can further compensate for the current deviation caused by the difference in mechanical loss of each tension roller, thereby ensuring balanced power load, improving production line stability, and avoiding the problem of unbalanced load caused by the difference in mechanical loss, based on the existing technology.

[0054] In step S102 above, during the preset time period when the coiler performs the slitting operation, the rotational speed of the tension roll group is adjusted based on the strip speed at the exit of the last stand and the speed of the rolls on the last stand. The last stand is the last stand of the rolling mill. Figure 3 As shown, the specific steps include S1021-S1024: In existing technology, when the coiler performs a slitting operation, the strip tension between the outlet side of the tension roller group and the coiler disappears instantaneously, causing the tension on the inlet side of the tension roller group to fluctuate. If the conventional speed-current dual closed-loop control mode is still used at this time, erroneous adjustments will occur due to tension fluctuations, continuously adjusting the speed of the tension roller group, which can easily lead to uncontrolled speed of the tension roller group. When slitting is completed and the coiler re-establishes tension, the speed of the tension roller group and the speed of the coiler may have deviated significantly, which may even cause strip breakage in severe cases. To address this technical problem, the embodiments of this application correct the speed of the tension roller group through the following steps S1021-S1024 to achieve a smooth transition in the slitting process.

[0055] S1021: During the preset time period when the coiler performs the slitting operation, the forward slip value is obtained based on the strip line speed and the speed of the last stand roll.

[0056] Specifically, the preset time period can be the period between the preset time before the winding machine performs the slitting operation and the time between the completion of slitting and the re-establishment of the winding machine tension.

[0057] At a preset time before the coiler performs the slitting operation, such as 1 second before the coiler performs the slitting operation, the strip speed and the roll speed at the last stand exit are collected. The forward slip value under the current rolling condition is calculated based on the following formula 1:

[0058] In the formula, This is the forward sliding value. For the strip speed, The speed of the rolls on the last stand.

[0059] The forward slip value reflects the velocity increment of the strip due to rolling deformation and is an important parameter characterizing the rolling state.

[0060] S1022: Switch the tension roll control mode of the silicon steel cold rolling mill from the speed and current dual closed-loop control mode to the speed loop control mode.

[0061] Specifically, this can be achieved by switching the control mode of the tension roll group from the dual closed-loop control of speed and current during normal rolling to pure speed loop control. This temporarily disconnects the current loop's response to tension deviations, allowing the tension roll group to adjust only according to speed commands, no longer automatically adjusting the current output due to tension fluctuations. This mode switch can prevent serious consequences caused by misjudgment and continuous adjustment of the tension roll speed after the tension disappears at the moment of slitting.

[0062] S1023: Determine the speed correction value based on the forward slip value and strip thickness. This specifically includes the following steps: S10231-S10232: S10231: Determine the thickness compensation coefficient based on the strip thickness.

[0063] Specifically, the thickness compensation coefficient can be determined based on the strip thickness detected by the thickness gauge at the exit of the last stand. Strips of different thicknesses exhibit different deformation characteristics during rolling, resulting in varying degrees of influence on the forward slip value. Therefore, a piecewise function can be pre-set based on the thickness range, assigning different thickness compensation coefficients to different thickness ranges.

[0064] In a specific implementation, the correspondence between strip thickness and thickness compensation coefficient is shown in Table 1 below: Table 1 Correspondence between strip thickness and thickness compensation coefficient

[0065] S10232: Determine the speed correction value based on the forward slip value, strip thickness, and thickness compensation coefficient.

[0066] Specifically, the speed correction value can be calculated based on the following formula 2:

[0067] In the formula, This is the speed correction value. This is the forward sliding value. This is the thickness compensation coefficient. This refers to the thickness of the strip steel.

[0068] S1024: Adjust the speed of the tension roller group according to the speed correction value.

[0069] Specifically, the speed correction value can be applied continuously to the speed loop during the slitting period (i.e., the preset time period), enabling the tension roller group to maintain a rolling speed relationship consistent with the preset time (e.g., 1 second before the coiler performs the slitting operation). Through the correction of the speed correction value, the speed loop no longer responds to speed fluctuations caused by the loss of tension, but instead operates stably in the forward sliding state at the preset time, thereby preventing the tension roller group from losing speed control during slitting. Once the coiler completes slitting and re-establishes stable tension, the tension roller control mode is switched back to the normal speed-current dual closed-loop control mode, and the speed correction value is stopped.

[0070] In this embodiment, step S102 locks the strip speed before slitting and switches to pure speed loop control mode during slitting, so that the tension roller group runs stably according to the speed relationship at a preset time. This effectively avoids the problem of speed misadjustment and speed loss due to tension fluctuation after the tension disappears at the moment of slitting, and ensures that the tension roller group matches the speed of the coiler when the coiler re-tensions, thereby eliminating the risk of strip breakage caused by the slitting operation and achieving a smooth transition in the slitting process.

[0071] In step S103 above, if slippage occurs in the tension roller group, the current setpoint at the moment of slippage is locked on the slipping roller until the slippage disappears. Figure 4 As shown, the specific steps include S1031-S1034: In existing technologies, as production continues, the surface roughness of the tension roller gradually decreases, and the coefficient of friction between it and the strip decreases accordingly, making the roller prone to slippage. When slippage occurs, the speed-current dual closed-loop control mode continuously increases the speed setpoint of the slipping roller due to the detection of speed deviation, until it reaches the upper limit of the speed setting. During this process, the slipping roller not only fails to provide effective tension, but also causes scratches on the strip surface due to increased idling, and in severe cases, even leads to strip breakage. To address this technical problem, the embodiments of this application lock the current setpoint value of the slipping roller through the following steps S1031-S1034 to suppress and eliminate slippage.

[0072] S1031: If slippage occurs in the tension roller group, the current setpoint at the moment when the slipping roller is confirmed to be slipping shall be used as the target current value.

[0073] Specifically, when slippage is detected in the tension roller assembly, the current setpoint of the slipping roller at the moment of detection is immediately recorded, and this value is used as the target current value. This target current value reflects the current output state of the control system at the instant slippage occurs, serving as a reference value for subsequent locking control.

[0074] S1032: Obtain the reverse current correction value based on the current setpoint and target current value of the slipping roller.

[0075] Specifically, it can be done by monitoring the current setpoint output by the current loop to the slipping roller in real time. Since the current setpoint is continuously increased by the conventional speed-current dual closed-loop control mode after slippage occurs due to the detection of speed deviation, the current setpoint must be greater than or equal to the target current value at the moment slippage occurs.

[0076] The difference between the current setpoint and the target current value is calculated; this difference is the reverse current correction value. Since the current setpoint only increases and never decreases after slippage, the reverse current correction value is always positive.

[0077] S1033: Couple the reverse current correction value to the current setpoint of the slip roller to obtain the current execution value.

[0078] Specifically, this can be achieved by calculating the difference between the current setpoint and the reverse current correction value, which becomes the current execution value. Through this correction, the current execution value of the slippage roller is locked at the target current value at the moment slippage occurs, preventing it from increasing meaninglessly due to erroneous commands from the speed loop.

[0079] S1034: Control the slippage roller based on the current execution value until the slippage of the roller body disappears.

[0080] Specifically, the current execution value can be sent as the final current command to the anti-slip roller, controlling the anti-slip roller motor to operate according to the current execution value. During this process, since the current command no longer increases, the anti-slip roller is no longer forcibly accelerated, creating conditions for the self-elimination of the slippage phenomenon. Once sufficient friction is re-established on the roller surface of the anti-slip roller, its actual rotational speed gradually becomes consistent with that of the other tension rollers. After confirming that the roller slippage phenomenon has disappeared, the reverse coupling of the current setpoint is deactivated, and normal current regulation is restored.

[0081] In this embodiment of the application, step S103 above can be specifically determined by the following steps S10301-S10302 to determine if the tension roller group is experiencing roller slippage: S10301: Determine the average speed of all tension rollers in the tension roller group as the average speed value.

[0082] Specifically, this can be achieved by real-time acquisition of the rotational speed of each tension roller in the tension roller group, and calculation of the arithmetic mean of the rotational speeds of all tension rollers as the average rotational speed. For example, if the real-time rotational speeds of the four tension rollers are V1, V2, V3, and V4, then the average rotational speed V_avg = (V1 + V2 + V3 + V4) / 4.

[0083] S10302: If the deviation between the rotational speed of any tension roller in the tension roller group and the average rotational speed is greater than the preset deviation threshold, it is determined that the roller slippage phenomenon has occurred in the tension roller group.

[0084] Specifically, this can be achieved by calculating the absolute value of the deviation between the rotational speed of each tension roller and its average rotational speed. When the deviation of any tension roller exceeds a preset deviation threshold (e.g., 1%), it is determined that the tension roller has slipped. This determination is based on the fact that under normal operating conditions, the rotational speeds of all tension rollers should be basically consistent. When any roller slips due to a decrease in the coefficient of friction, its rotational speed will be significantly higher than that of the other tension rollers, causing the rotational speed deviation to exceed the normal range. This method allows for timely identification of abnormal rollers in the early stages of slippage, providing triggering conditions for subsequent locking control.

[0085] In this embodiment, step S103 effectively prevents the vicious cycle of continuously increasing current due to speed misjudgment in conventional control by locking the current setpoint of the slipping roller at the level at the moment slippage occurs when slippage is detected on the tension roller. In this way, the slipping roller is no longer forcibly accelerated, avoiding the aggravation of slippage, scratches on the strip surface, and overcurrent faults, thus creating conditions for the self-recovery of roller surface friction. This method effectively reduces the risk of strip breakage caused by slippage while ensuring equipment safety, improving product quality and production stability.

[0086] Example 2 Based on the same inventive concept, embodiments of the present invention also provide a tension roll group control device for a silicon steel cold rolling mill, referring to... Figure 5 As shown, the device includes: The first correction module 101 is used to correct the current setpoint of each tension roller in the tension roller group in real time according to the rotation speed of the tension roller group, so as to balance the load of each tension roller. The second correction module 102 is used to correct the rotational speed of the tension roll group based on the strip speed at the exit of the last stand and the speed of the rolls of the last stand during a preset time period when the coiler performs the slitting operation; wherein the last stand is the last stand of the rolling mill group. The slippage control module 103 is used to lock the current setpoint of the slipping roller at the moment of slippage if the slipping phenomenon occurs in the tension roller group, until the slipping phenomenon disappears.

[0087] Example 3 Based on the same inventive concept, embodiments of the present invention also provide a computer-readable storage medium storing a computer program / instruction thereon, which, when executed by a processor, implements the tension roll group control method for a silicon steel cold rolling mill as described in Embodiment 1 above.

[0088] Example 4 Based on the same inventive concept, this embodiment of the invention also provides a computer program product, including a computer program / instruction, which, when executed by a processor, implements the tension roll group control method of the silicon steel cold rolling mill as described in Embodiment 1 above.

[0089] Example 5 Based on the same inventive concept, this embodiment of the invention also provides a computer device, including a memory, a processor, and a computer program stored in the memory. When the processor executes the computer program, it implements the tension roll group control method of the silicon steel cold rolling mill as described in Embodiment 1 above.

[0090] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage and optical storage) containing computer-usable program code.

[0091] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0092] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0093] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0094] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for controlling the tension roll group of a silicon steel cold continuous rolling mill, characterized in that, The method, applicable to a silicon steel cold continuous rolling mill, wherein the silicon steel cold continuous rolling mill comprises a rolling mill group, a tension roll group, and a coiler connected in sequence, includes: The current setpoint of each tension roller in the tension roller group is corrected in real time according to the rotation speed of the tension roller group in order to balance the load of each tension roller. During a preset time period when the coiler performs the slitting operation, the rotational speed of the tension roll group is adjusted according to the strip speed at the exit of the last stand and the speed of the rolls in the last stand; wherein, the last stand is the last stand of the rolling mill group; If slippage occurs in the tension roller group, the current setpoint of the slipping roller at the moment of slippage is locked until the slippage disappears.

2. The method according to claim 1, characterized in that, The real-time correction of the current setpoint of each tension roller in the tension roller group based on the rotational speed of the tension roller group, in order to balance the load of each tension roller, includes: Based on the rotational speed of the tension roller group, a preset speed-current correction table is consulted in real time to determine the current correction value corresponding to each tension roller in the tension roller group. For each tension roller, the current setpoint of the tension roller is corrected according to the current correction value corresponding to the tension roller.

3. The method according to claim 2, characterized in that, The preset speed-current correction table is obtained in the following manner: Based on the maximum speed of the tension rollers in the tension roller group, multiple test speeds are determined; The tension roller assembly is controlled to perform an idle test at each of the test speeds to obtain the average current of each tension roller at each of the test speeds. Based on the average current of each tension roller at each test speed, the average current of all tension rollers at each test speed is obtained; For each test speed and each tension roller, the difference between the average current of the tension roller at that test speed and the average current of all tension rollers at that test speed is used as the current correction value of the tension roller at that test speed. The preset speed-current correction table is obtained based on the current correction value of each tension roller at each test speed.

4. The method according to claim 1, characterized in that, During the preset time period when the coiler performs the slitting operation, the rotational speed of the tension roll group is adjusted according to the strip speed at the exit of the last stand and the speed of the rolls on the last stand, including: During a preset time period when the coiler performs the slitting operation, the forward slip value is obtained based on the strip line speed and the speed of the last stand rolls; Switch the control mode of the tension roller group from the speed-current dual closed-loop control mode to the speed loop control mode; The rotational speed correction value is determined based on the forward slip value and the strip thickness. The rotational speed of the tension roller assembly is adjusted according to the rotational speed correction value.

5. The method according to claim 4, characterized in that, The step of determining the speed correction value based on the forward slip value and the strip thickness includes: Determine the thickness compensation coefficient based on the strip thickness; The rotational speed correction value is determined based on the forward slip value, the strip thickness, and the thickness compensation coefficient.

6. The method according to claim 1, characterized in that, If slippage occurs in the tension roller group, the current setpoint at the moment of slippage is locked until the slippage disappears, including: If slippage occurs in the tension roller group, the current setpoint at the moment when the slipping roller is confirmed to be slipping is taken as the target current value. Based on the current setpoint of the slipping roller and the target current value, the reverse current correction value is obtained; The reverse current correction value is coupled to the current setpoint of the slipping roller to obtain the current execution value; The slippage roller is controlled based on the current value until the slippage of the roller body disappears.

7. The method according to claim 1, characterized in that, The occurrence of roller slippage in the tension roller assembly is determined by the following method: The average rotational speed of all tension rollers in the tension roller group is determined as the average rotational speed. If the deviation of the rotational speed of any tension roller in the tension roller group from the average rotational speed is greater than a preset deviation threshold, it is determined that the tension roller group has experienced roller slippage.

8. A tension roll group control device for a silicon steel cold continuous rolling mill, characterized in that, include: The first correction module is used to correct the current setpoint of each tension roller in the tension roller group in real time according to the rotation speed of the tension roller group, so as to balance the load of each tension roller. The second correction module is used to correct the rotational speed of the tension roll group based on the strip speed at the exit of the last stand and the speed of the rolls of the last stand during a preset time period when the coiler performs the slitting operation; wherein the last stand is the last stand of the rolling mill group. The slippage control module is used to lock the current setpoint of the slipping roller at the moment of slippage if the slipping phenomenon occurs in the tension roller group, until the slipping phenomenon disappears.

9. A computer-readable storage medium having a computer program / instructions stored thereon, characterized in that, When the computer program / instruction is executed by the processor, it implements the tension roll group control method of the silicon steel cold rolling mill as described in any one of claims 1-7.

10. A computer device, comprising a memory, a processor, and a computer program stored in the memory, characterized in that, The processor executes the computer program to implement the tension roll group control method for a silicon steel cold rolling mill as described in any one of claims 1-7.

Images