A strip rolling speed adjusting method, device, medium and electronic equipment

Abstract

The application relates to the strip rolling technical field and discloses a strip rolling speed adjusting method, a device, a medium and an electronic device. The method comprises the following steps: obtaining a target outlet thickness of a strip steel; determining a speed reduction mode of a cold rolling unit based on the target outlet thickness; performing a speed reduction test on the cold rolling unit in a preset period based on the speed reduction mode to obtain a test result; obtaining a speed parameter of a rolling mill of the cold rolling unit and a position parameter of a rack of the cold rolling unit according to the test result; determining a target distance of the rolling mill for completing the speed reduction test based on the speed parameter, a scanning period corresponding to the preset period and the position parameter; and adjusting the speed of the rolling mill to a target shearing speed based on the target distance. The application can accurately obtain the target distance of the rolling mill for completing the speed reduction test and then adjust the speed of the rolling mill to the target shearing speed according to the target distance, so that the problem of inaccurate speed reduction control of the strip steel when the speed is reduced to the shearing speed is solved.

Description

Technical Field

[0001] This application relates to the field of strip rolling technology, and in particular to a method, apparatus, medium, and electronic equipment for adjusting strip rolling speed. Background Technology

[0002] For thin-gauge pickling and rolling mills, the stands use smooth roll rolling, allowing for relatively high set speeds, typically exceeding 1500 m / min. These mills are characterized by thin sheet material and high speed. However, during strip rolling, the maximum speed varies depending on the steel grade, specifications, and actual control requirements. Controlling the speed based on a fixed distance between the weld and the mill can lead to the weld slowing down to shear speed before reaching the stand, or only after entering the mill. Slowing down before the stand results in prolonged low-speed operation, impacting production capacity. Slowing down only after entering the mill causes significant roll gap variations, potentially leading to strip breakage. Therefore, existing technology suffers from inaccurate strip speed control during the slowdown to shear speed phase, resulting in subsequent production capacity issues and strip breakage problems. Summary of the Invention

[0003] This application provides a method, device, medium, and electronic equipment for adjusting the rolling speed of strip, which can accurately obtain the target distance for the mill to complete the deceleration test and then adjust the speed of the mill to the target shearing speed based on the target distance, thereby solving the problem of inaccurate deceleration control of strip steel when decelerating to the shearing speed.

[0004] Other features and advantages of this application will become apparent from the following detailed description, or may be learned in part from practice of this application.

[0005] According to one aspect of the embodiments of this application, a method for adjusting the rolling speed of strip is provided, the method comprising:

[0006] Obtain the target exit thickness of the strip steel;

[0007] The speed reduction mode of the cold rolling mill is determined based on the target exit thickness.

[0008] Based on the aforementioned speed reduction mode, a speed reduction test was conducted on the cold rolling mill within a preset period to obtain the test results.

[0009] Based on the test results, the speed parameters of the cold rolling mill and the position parameters of the stand of the cold rolling mill were obtained;

[0010] The target distance for the mill to complete the deceleration test is determined based on the speed parameters, the scanning period corresponding to the preset period, and the position parameters.

[0011] The mill speed is adjusted to the target shearing speed based on the target distance, so as to reduce the speed of the mill stand when rolling the tail of the strip.

[0012] In one embodiment of this application, based on the foregoing scheme, the speed reduction mode includes a first speed reduction mode, a second speed reduction mode, and a third speed reduction mode; determining the speed reduction mode of the cold rolling mill based on the target exit thickness includes:

[0013] If the target outlet thickness is within a preset first thickness range, the deceleration mode is determined to be the first deceleration mode;

[0014] If the target outlet thickness is within a preset second thickness range, the deceleration mode is determined to be the second deceleration mode;

[0015] If the target outlet thickness is within the preset third thickness range, the deceleration mode is determined to be the third deceleration mode.

[0016] In one embodiment of this application, based on the foregoing scheme, the test results include a first test result, a second test result, and a third test result; the step of conducting a speed reduction test on the cold rolling mill within a preset period based on the speed reduction mode to obtain test results includes:

[0017] If the speed reduction mode is the first speed reduction mode, a speed reduction test corresponding to the first speed reduction mode is performed on the cold rolling mill within the preset period to obtain the first test result.

[0018] If the speed reduction mode is the second speed reduction mode, a speed reduction test corresponding to the second speed reduction mode is performed on the cold rolling mill within the preset period to obtain the second test result;

[0019] If the speed reduction mode is the third speed reduction mode, a speed reduction test corresponding to the third speed reduction mode is carried out on the cold rolling mill within the preset period to obtain the third test result.

[0020] In one embodiment of this application, based on the foregoing scheme, obtaining the speed parameters of the cold rolling mill and the position parameters of the stand of the cold rolling mill according to the test results includes:

[0021] If the test result is the first test result, obtain the maximum speed of the mill, the shearing speed, the inlet roll speed, the acceleration corresponding to the first speed reduction mode, and the position parameters of the stand;

[0022] If the test result is the second test result, obtain the maximum speed of the mill, the shearing speed, the inlet roll speed, the acceleration corresponding to the second deceleration mode, and the position parameters of the stand;

[0023] If the test result is the third test result, obtain the maximum speed of the mill, the shearing speed, the inlet roll speed, the acceleration corresponding to the third deceleration mode, and the position parameters of the stand.

[0024] In one embodiment of this application, based on the foregoing scheme, determining the target distance for the rolling mill to complete the speed reduction test based on the speed parameter, the scanning period corresponding to the preset period, and the position parameter includes:

[0025] The target strip length required for the mill entrance is calculated based on the maximum speed, the shearing speed, the inlet roll speed, and the acceleration.

[0026] The first target reserved length of the strip is determined based on the scanning cycle and the inlet roller speed.

[0027] The target distance is determined based on the target strip length, the first target reserved length, the preset second target reserved length, and the deceleration distance corresponding to the position parameters.

[0028] In one embodiment of this application, based on the aforementioned scheme, the target distance is the sum of the target strip length, the first target reserved length, the second target reserved length, and the deceleration distance.

[0029] In one embodiment of this application, based on the foregoing scheme, the method further includes:

[0030] The rolling mill is divided into multiple target areas;

[0031] Based on the target distance, a target region corresponding to the target distance is selected from multiple target regions as an automatic deceleration region;

[0032] The length of the strip tail is detected based on the automatic deceleration zone and the detection device of the cold rolling mill.

[0033] According to one aspect of the embodiments of this application, a strip rolling speed adjustment device is provided. The device includes: a first acquisition unit, configured to acquire a target exit thickness of the strip; a first determination unit, configured to determine a speed reduction mode of the cold rolling mill based on the target exit thickness; a test unit, configured to conduct a speed reduction test on the cold rolling mill within a preset period based on the speed reduction mode, and obtain test results; a second acquisition unit, configured to acquire the speed parameters of the cold rolling mill and the position parameters of the stand of the cold rolling mill based on the test results; a second determination unit, configured to determine a target distance for the mill to complete the speed reduction test based on the speed parameters, a scanning period corresponding to the preset period, and the position parameters; and an adjustment unit, configured to adjust the speed of the mill to a target shearing speed based on the target distance, so as to reduce the speed when the stand is rolling the strip tail.

[0034] According to one aspect of the embodiments of this application, a computer-readable storage medium is provided having a computer program stored thereon, the computer program including executable instructions that, when executed by a processor, implement the strip rolling speed adjustment method as described in the above embodiments.

[0035] According to one aspect of the embodiments of this application, an electronic device is provided, including: one or more processors; and a memory for storing executable instructions of the processors, which, when executed by the one or more processors, cause the one or more processors to implement the strip rolling speed adjustment method as described in the above embodiments.

[0036] In the technical solution of this application embodiment, different deceleration modes can be selected according to the target exit thickness of the strip steel, and then the deceleration acceleration under different deceleration modes can be obtained, thereby obtaining different test results. Based on the different test results, the speed parameters of the cold rolling mill and the position parameters of the cold rolling mill stand are obtained, and then the target distance for the mill to complete the deceleration test is calculated. At this time, the speed of the mill can be adjusted to the target shearing speed through the target distance, thereby achieving precise deceleration and solving the subsequent capacity problems and strip breakage problems caused by inaccurate strip deceleration control when decelerating to the shearing speed.

[0037] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0038] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings:

[0039] Figure 1 This is a flowchart illustrating a method for adjusting the strip rolling speed according to an embodiment of this application;

[0040] Figure 2 This is a flowchart illustrating the process of determining the speed reduction test of the rolling mill based on the speed parameter, the scanning period corresponding to the preset period, and the position parameter, according to an embodiment of this application.

[0041] Figure 3 This is a block diagram illustrating a strip rolling speed adjustment device according to an embodiment of this application;

[0042] Figure 4 This is a schematic diagram of the system structure of an electronic device according to an embodiment of this application;

[0043] Figure 5 This is a schematic diagram of the transition curve of a rolling mill during automatic speed reduction, according to an embodiment of this application.

[0044] Figure 6 This is a schematic diagram of an automatic speed reduction model for a rolling mill according to an embodiment of this application;

[0045] Figure 7 This is a schematic diagram illustrating the division of the weld seam distance from the mill length region according to an embodiment of this application. Detailed Implementation

[0046] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make this application more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0047] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0048] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller node devices.

[0049] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily have to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0050] It should be noted that "multiple" in this article refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0051] The implementation details of the technical solutions in the embodiments of this application are described in detail below:

[0052] First, it should be noted that the strip rolling speed adjustment scheme proposed in this application can be applied to related technical fields of strip rolling. Different speed reduction modes can be selected based on the target exit thickness of the strip, and different speed reduction accelerations can be obtained under different speed reduction modes, leading to different test results. Based on the different test results, the speed parameters of the cold rolling mill and the position parameters of the cold rolling mill stand are obtained, and the target distance for the mill to complete the speed reduction test is calculated. At this point, the speed of the mill can be adjusted to the target shearing speed based on the target distance, thereby achieving precise speed reduction and solving the subsequent capacity problems and strip breakage problems caused by inaccurate strip speed reduction control when reducing speed to the shearing speed.

[0053] According to one aspect of this application, a method for adjusting the rolling speed of strip is provided. Figure 1 The flowchart below illustrates a method for adjusting the strip rolling speed according to an embodiment of this application. This method includes at least steps 110 to 160, detailed below:

[0054] In step 110, the target exit thickness of the strip is obtained.

[0055] Specifically, different speed reduction modes can be selected based on the target exit thickness of the strip. These speed reduction modes are categorized according to the exit thickness h1 to ensure that the mill improves product quality without affecting production capacity. The maximum speed of the mill is set to 1800 m / min. When the exit thickness h1 > 0.25 mm, the acceleration mode in the first speed reduction mode is selected for speed reduction; when the exit thickness 0.2 < h1 ≤ 0.25 mm, the acceleration mode in the second speed reduction mode is selected for speed reduction; and when the exit thickness h1 ≤ 0.2 mm, the acceleration mode in the third speed reduction mode is selected for speed reduction.

[0056] In step 120, the speed reduction mode of the cold rolling mill is determined based on the target exit thickness.

[0057] In one embodiment of this application, the speed reduction mode includes a first speed reduction mode, a second speed reduction mode, and a third speed reduction mode; determining the speed reduction mode of the cold rolling mill based on the target exit thickness includes:

[0058] If the target outlet thickness is within a preset first thickness range, the deceleration mode is determined to be the first deceleration mode;

[0059] If the target outlet thickness is within a preset second thickness range, the deceleration mode is determined to be the second deceleration mode;

[0060] If the target outlet thickness is within the preset third thickness range, the deceleration mode is determined to be the third deceleration mode.

[0061] Specifically, in the rolling of thin-gauge materials, excessively rapid rolling acceleration can lead to large fluctuations in mill force, resulting in poor sheet shape or significant variations in sheet thickness. Conversely, excessively slow automatic rolling acceleration can negatively impact mill production efficiency. To address this issue, this application provides three different speed-up / down modes for the mill to select from, namely HIGH (first speed-down mode), Mid (second speed-down mode), and Low (third speed-down mode), based on the mill's set maximum speed V. MAX The time t required to reduce the acceleration to 0 varies, so we can calculate the corresponding acceleration.

[0062] Acceleration calculation in HIGH mode: t1 is the time required for the rolling mill's maximum speed to decrease to 0;

[0063] Acceleration calculation in Middle mode: t2 is the time required for the rolling mill's maximum speed to decrease to 0.

[0064] Acceleration calculation in Low mode: t3 is the time required for the rolling mill's maximum speed to decrease to 0.

[0065] Where t1 < t2 < t3; a1 > a2 > a3.

[0066] Furthermore, the speed-up and speed-down modes are categorized according to the exit thickness h1 to ensure that the rolling mill improves product quality without affecting production capacity. The maximum speed of the rolling mill is set to 1800 mpm. In HIGH mode, t1 = 30 s; in Middle mode, t2 = 31.1 s; and in Low mode, t3 = 46.6 s. Therefore...

[0067] When the outlet thickness h1 > 0.25 mm, the acceleration in HIGH mode is automatically selected to reduce the speed.

[0068] When the outlet thickness is 0.2 < h1 ≤ 0.25 mm, the acceleration in Middle mode is automatically selected for deceleration.

[0069] When the outlet thickness h1 ≤ 0.2 mm, the acceleration in Low mode will be automatically selected to reduce the speed.

[0070] To ensure smooth speed changes and avoid inappropriate tension fluctuations during automatic deceleration, an "edge chamfering" control was developed when decelerating from the mill's highest speed. This control resembles an S-curve (approximately 0.5 seconds, software-variable), meaning that within 0.5 seconds, the acceleration changes from 0 to the desired acceleration 'a', while the deceleration changes from 0 to -a. This facilitates the protection of the tension rolls, mill speed reducers, and other components, ensuring smooth speed changes. Based on actual operating conditions, the transition curve set for this unit is shown below, with a schematic diagram as follows. Figure 5 As shown.

[0071] When deceleration begins:

[0072] When deceleration ends:

[0073] In step 130, a speed reduction test is conducted on the cold rolling mill within a preset period based on the speed reduction mode, and the test results are obtained.

[0074] In one embodiment of this application, the test results include a first test result, a second test result, and a third test result; the step of conducting a speed reduction test on the cold rolling mill within a preset period based on the speed reduction mode to obtain test results includes:

[0075] If the speed reduction mode is the first speed reduction mode, a speed reduction test corresponding to the first speed reduction mode is performed on the cold rolling mill within the preset period to obtain the first test result.

[0076] If the speed reduction mode is the second speed reduction mode, a speed reduction test corresponding to the second speed reduction mode is performed on the cold rolling mill within the preset period to obtain the second test result;

[0077] If the speed reduction mode is the third speed reduction mode, a speed reduction test corresponding to the third speed reduction mode is carried out on the cold rolling mill within the preset period to obtain the third test result.

[0078] Specifically, since the acceleration corresponding to each deceleration mode is different, the test results corresponding to different accelerations are also different. Therefore, by conducting deceleration tests on the cold rolling mill corresponding to the first deceleration mode, the second deceleration mode, and the third deceleration mode within the preset period, the corresponding first test results, second test results, and third test results can be obtained respectively.

[0079] In step 140, the speed parameters of the cold rolling mill and the position parameters of the stand of the cold rolling mill are obtained based on the test results.

[0080] In one embodiment of this application, obtaining the speed parameters of the cold rolling mill and the position parameters of the stand of the cold rolling mill based on the test results includes:

[0081] If the test result is the first test result, obtain the maximum speed of the mill, the shearing speed, the inlet roll speed, the acceleration corresponding to the first speed reduction mode, and the position parameters of the stand;

[0082] If the test result is the second test result, obtain the maximum speed of the mill, the shearing speed, the inlet roll speed, the acceleration corresponding to the second deceleration mode, and the position parameters of the stand;

[0083] If the test result is the third test result, obtain the maximum speed of the mill, the shearing speed, the inlet roll speed, the acceleration corresponding to the third deceleration mode, and the position parameters of the stand.

[0084] Specifically, after completing the speed reduction test of the cold rolling mill within a preset period, various parameters corresponding to each test result (first test result, second test result, and third test result) are obtained based on each different test result. The collected parameters are the speed parameters of the rolling mill and the position parameters of the stand of the cold rolling mill. Figure 6 As shown, Figure 6 This is a flowchart illustrating the automatic speed reduction process of a rolling mill. The speed parameters of the rolling mill include the maximum rolling speed V5 and the shearing speed V. 5ASD Inlet roller speed V EBRAnd the acceleration 'a', the stand position parameters are used to determine the distance L from the point where the mill deceleration is completed to the point where stand 1 is running at a constant speed. E1 .

[0085] In step 150, the target distance for the rolling mill to complete the deceleration test is determined based on the speed parameter, the scanning period corresponding to the preset period, and the position parameter.

[0086] In one embodiment of this application, see Figure 2 Step 150 can be performed according to steps S1-S3:

[0087] Step S1: Calculate the target strip length required for the mill entrance based on the maximum speed, the shearing speed, the inlet roll speed, and the acceleration.

[0088] Step S2: Determine the first target reserved length of the strip based on the scanning cycle and the inlet roller speed.

[0089] Step S3: Determine the target distance based on the target strip length, the first target reserved length, the preset second target reserved length, and the deceleration distance corresponding to the position parameters.

[0090] In one embodiment of this application, the target distance is the sum of the target strip length, the first target reserved length, the second target reserved length, and the deceleration distance.

[0091] Specifically, the target strip length L required for the theoretical mill inlet is calculated by back-calculating based on the mill's maximum speed and the tension roll speed. ASD :

[0092] Based on the PLC scan cycle ΔT S (20ms) and for further reasonable control, a delay of 1s is needed in the scanning cycle. Calculate the first target reserved length ΔL that the strip travels from the time the tension roller receives the signal to the time it starts. TD :

[0093] ΔL TD =(ΔT) S +1)×V EBR

[0094] Increase the reserved distance ΔL from the deceleration completion point to rack 1. ASD The system compensates for the distance required to complete the overall deceleration, allowing for flexible control of the deceleration completion point as needed; it can be set as follows:

[0095] When the specifications of the front and rear rolls change, ΔL ASD=L, in order to reduce the distance of low-speed operation and increase production capacity, L=0 can be selected, that is, the position of the speed reduction completion point is 1 frame;

[0096] When the front and rear rolls are of the same specification, the speed reduction completion point can be after frame 1, at which point ΔL ASD =-L; The purpose is to reduce the time spent in low-speed operation after the mill speed is reduced, which is conducive to improving the mill's capacity while ensuring stability.

[0097] To prevent strip deviation and scraping at the mill inlet, a detection device is installed in the looper outlet area. When the detection device detects a strip tail offset greater than X mm (X can be selected as 5 mm), the mill will proceed at the originally reserved length ΔL. 0ASD Based on this, the speed is reduced by a certain distance L1 in advance, at which point the preset reserved length for the second target is ΔL. ASD +L E1 , where ΔL ASD =ΔL 0ASD +L1, based on experience, L1 can be taken as 10m.

[0098] Based on the above, the calculation model for the distance required to complete the speed reduction at the mill inlet is as follows: Figure 6 As shown:

[0099] L TASD =L ASD +ΔL TD +L E1 +ΔL ASD

[0100] In step 160, the speed of the mill is adjusted to the target shearing speed based on the target distance, so as to reduce the speed of the mill stand when rolling the tail of the strip.

[0101] Specifically, through the obtained target distance L TASD This means that the distance required for the mill to decelerate at the inlet can be obtained, and from this, the starting point of the deceleration of the strip can be determined. Then, the speed of the mill can be adjusted to the target shearing speed based on the starting point of the deceleration, so that the deceleration occurs when the mill stand is rolling the tail of the strip.

[0102] In one embodiment of this application, the method further includes:

[0103] The rolling mill is divided into multiple target areas;

[0104] Based on the target distance, a target region corresponding to the target distance is selected from multiple target regions as an automatic deceleration region;

[0105] The length of the strip tail is detected based on the automatic deceleration zone and the detection device of the cold rolling mill.

[0106] Specifically, the difference between the distance between the inner tail weld of the looper and the first stand, the strip length required to complete the speed reduction, and the distance from the speed reduction completion point to the mill entrance is used to determine whether the mill will automatically select speed reduction.

[0107] First, the strip length of the looper is directly calculated by the encoder of the looper car. To prevent the looper from being pulled empty and damaging related equipment, the looper's storage capacity needs to be calculated periodically (every 20ms). Assuming the weld enters the looper, the weld is positioned at the very top of the looper, which is sufficiently long, and the distance between the weld and the mill is set to L. MAX This can be used as the starting point for the maximum length during automatic speed reduction of the rolling mill. For thin-gauge continuous rolling mills, it can be set to L. MAX =160m.

[0108] Second, the selection of the automatic deceleration zone at the tail of the rolling mill is based on the location of the deceleration trigger point within the deceleration zone.

[0109] 160 - Target distance < 40m: If yes, the deceleration start point is in Zone 4, and the distance corrected for Zone 4 is used as the calculated value for the tail length; if not, it is necessary to further check whether the difference between 120m and the target distance is < 40m: If yes, the deceleration start point is in Zone 3, and the distance corrected for Zone 3 is used as the calculated value for the tail length; if not, it is necessary to further check whether the difference between 80m and the target distance is < 40m. If yes, the deceleration start point is in Zone 2, and the distance corrected for Zone 2 is used as the calculated value for the tail length; if not, it is necessary to further check whether the difference between 40m and the target distance is < 40m. If yes, the deceleration start point is in Zone 1, and the distance corrected for Zone 1 is used as the calculated value for the tail length.

[0110] Third, to ensure the accuracy of the weld seam distance from the mill during speed reduction, L can be used. MAX =160m is divided into 4 zones, each 40m long, and the distance from the tail weld to the rolling mill is revised, such as Figure 7 As shown, accurate tracking is achieved through a correction method. Within zones 2-4 of the looper, there are five swing doors within every 40m interval, with an 8m distance between them. When the distance detected by the encoder differs from the fixed distance of the first swing door in each zone, the distance detected by that swing door is used for correction. Furthermore, since zone 1 is located within the looper outlet correction area to the frame, and is close to the weld detection, the detected distance is directly selected as the length calculation value. This ensures the accuracy of weld tracking distance, achieving precise control during automatic speed reduction.

[0111] The following two specific examples illustrate this:

[0112] Example 1:

[0113] (a) Collect the speed parameters of the main equipment of the cold rolling mill for 0.213mm thick strip during operation, including the following steps:

[0114] a1) Collect data on the maximum speed of the cold rolling mill before speed reduction (1600 m / s), and the shear speed V at the exit after speed reduction. 5ASD =240mpm (meters per minute), the roll speed V of the mill inlet tension roll before starting the deceleration. EBR =161mpm;

[0115] a2) Collect the distance L from the point where the deceleration is completed in the automatically selected middle (t2 = 31.1s) mode to the point where the rack is running at a constant speed. E1 To increase production capacity and reduce low-speed operation time, the deceleration completion point can be automatically selected as rack 1, L. E1 =0;

[0116] a3) Collect the PLC scan cycle ΔT S =20ms; The tension roller receives the signal and begins to start the mill inlet speed V. EBR =161mpm.

[0117] (b) Selection of speed reduction method: the strip exit thickness h1 = 0.213 mm, 0.2 < h1 ≤ 0.25 mm, the mill automatically selects Middle mode for speed reduction, t2 = 31.1 s;

[0118] (c) The formula for the speed transition curve during deceleration is:

[0119] The formula for the speed transition curve at the end of deceleration is:

[0120] c1) Calculate the theoretical target strip length required at the mill inlet based on the mill's maximum speed and the tension roll speed:

[0121]

[0122] c2) Based on the PLC scanning cycle of 20ms and for more reasonable control, a delay of 1s is required for the scanning cycle. Calculate the length of the strip that the tension roller travels from receiving the signal to starting.

[0123] ΔL TD =(ΔT) S +1)×V EBR=(20ms / 1000+1)×161 / 60=2.737m;

[0124] c3) Since the front and rear coils are of the same specification, the mill does not need to perform FGC. The speed reduction completion point can be after the first stand. Based on empirical values, ΔL at this time... ASD = -1.5m;

[0125] Therefore, L TASD =L ASD +ΔL TD +L E1 +ΔL ASD =36.26+2.737+0-1.5=37.497m.

[0126] (d) Selection of the region to trigger the deceleration point:

[0127] Because of 40m-L TASD If the difference between 40m and 37.497m is 2.503m, and is less than 40m, then the deceleration start point is in Zone 1, and the distance detected in Zone 1 is used as the calculated value of the belt tail length.

[0128] Therefore, at the current position of 37.497m from the weld seam at the end of the coil, the rolling mill automatically slows down to the shearing speed to achieve precise control of continuous rolling.

[0129] Example 2:

[0130] (a) Collect the speed parameters of the main equipment in the cold rolling mill for 0.184mm thick strip during operation, including the following steps:

[0131] a1) Since the exit thickness h1 = 0.184 < 0.2 mm, the maximum speed of the cold rolling mill before speed reduction is 1500 m / min. After speed reduction, the exit shear speed V 5ASD =220mpm, the roll speed V of the mill inlet tension roll before starting the deceleration. EBR =153mpm;

[0132] a2) Collect the distance L from the point where the deceleration is completed in the automatically selected Low mode (t3 = 46.6s) to the point where the rack is running at a constant speed. E1 To increase production capacity and reduce low-speed operation time, the deceleration completion point can be selected as frame 1, L. E1 =0;

[0133] a3) Collect the PLC scan cycle ΔT S =20ms; The tension roller receives the signal and begins to start the mill inlet speed V. EBR =153mpm.

[0134] (b) Selection of speed reduction method: The strip exit thickness h1 = 0.184 mm, h1 < 0.2 mm, the mill automatically selects Low mode for speed reduction, t3 = 46.6 s;

[0135] (c) The formula for the speed transition curve during deceleration is:

[0136] The formula for the speed transition curve at the end of deceleration is:

[0137] c1) Calculate the theoretical target strip length required at the mill inlet based on the mill's maximum speed and the tension roll speed:

[0138]

[0139] c2) Based on the PLC scan cycle ΔT S =20ms and for more reasonable control, a delay of 1s is needed for the scanning cycle. The length of the strip that the tension roller travels from receiving the signal to starting is calculated.

[0140] ΔL TD =(ΔT) S +1)×V EBR =(20ms / 1000+1)×153 / 60=2.601m;

[0141] c3) Due to a change in the specifications of the subsequent coil, the finished product thickness is now 0.192mm. The mill needs to perform FGC (Fluid Gas Grating), and the speed reduction is completed at stand 1. Based on empirical values, ΔL at this point... ASD =0m;

[0142] c4) A detection device is installed in the looper exit area. When this device detects a strip offset of X = 8mm > 5mm within 20m of the strip tail (5mm is a set empirical value), the rolling mill will select to roll at the originally reserved length ΔL. 0ASD If the speed is reduced by a distance L1 = 10m before the speed reaches zero, then:

[0143] ΔL ASD =ΔL 0ASD +L1=0+10=10m

[0144] Therefore, L TASD =L ASD +ΔL TD +L E1 +ΔL ASD =48.43+2.601+0+10=61.031m.

[0145] (d) Selection of the region to trigger the deceleration point:

[0146] Because of 80m-L TASD If the difference between 80m and 61.031m is 18.969m and is less than 40m, then the deceleration start point is in zone 2, and the distance corrected for zone 3 is used as the calculated value of the belt tail length.

[0147] Therefore, at the current position of 61.031m from the weld seam at the end of the coil, the rolling mill automatically reduces its speed to the shearing speed to achieve precise control of continuous rolling.

[0148] In summary, the method provided in this application can select different deceleration modes based on the target exit thickness of the strip, and then obtain the deceleration acceleration under different deceleration modes, thereby obtaining different test results. Based on the different test results, the speed parameters of the cold rolling mill and the position parameters of the cold rolling mill stand are obtained, and the target distance for the mill to complete the deceleration test is calculated. At this point, the speed of the mill can be adjusted to the target shearing speed through the target distance, thereby achieving precise deceleration and solving the subsequent capacity problems and strip breakage problems caused by inaccurate strip deceleration control when decelerating to the shearing speed. This application can realize the automatic deceleration function of the continuous rolling mill based on the target exit thickness of the strip, ensuring that strip breakage accidents caused by deceleration do not occur, while improving the production efficiency of the unit, reducing production costs, and reducing human intervention in production, thus improving the automation level of the unit.

[0149] Figure 3 This is a block diagram of a strip rolling speed adjustment device 300 according to an embodiment of the present application. According to an embodiment of the present application, the strip rolling speed adjustment device 300 includes: a first acquisition unit 301, a first determination unit 302, a test unit 303, a second acquisition unit 304, a second determination unit 305, and an adjustment unit 306.

[0150] The first acquisition unit 301 is used to acquire the target exit thickness of the strip steel.

[0151] The first determining unit 302 is used to determine the speed reduction mode of the cold rolling mill based on the target exit thickness.

[0152] Test unit 303 is used to conduct a speed reduction test on the cold rolling mill within a preset period based on the speed reduction mode, and obtain test results.

[0153] The second acquisition unit 304 is used to acquire the speed parameters of the cold rolling mill and the position parameters of the stand of the cold rolling mill based on the test results.

[0154] The second determining unit 305 is used to determine the target distance for the rolling mill to complete the deceleration test based on the speed parameters, the scanning period corresponding to the preset period, and the position parameters.

[0155] The adjustment unit 306 is used to adjust the speed of the mill to a target shearing speed based on the target distance, so as to reduce the speed when the stand is rolling the tail of the strip.

[0156] In another aspect, this application also provides a computer-readable storage medium storing a program product capable of implementing the methods provided above in this specification. In some possible implementations, various aspects of this application may also be implemented as a program product comprising program code that, when run on a terminal device, causes the terminal device to perform the steps described in the "Embodiment Methods" section of this specification according to various exemplary embodiments of this application.

[0157] The program product for implementing the above-described method according to the embodiments of this application may employ a portable compact disc read-only memory (CD-ROM) and include program code, and may run on a terminal device, such as a personal computer. However, the program product of this application is not limited thereto. In this document, the readable storage medium may be any tangible medium containing or storing a program that may be used by or in conjunction with an instruction execution system, apparatus, or device.

[0158] The program product may employ any combination of one or more readable media. A readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of readable storage media (a non-exhaustive list) include: an electrical connection having one or more wires, a portable disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0159] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, carrying readable program code. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. A readable signal medium may also be any readable medium other than a readable storage medium, capable of sending, propagating, or transmitting programs for use by or in conjunction with an instruction execution system, apparatus, or device.

[0160] The program code contained on the readable medium may be transmitted using any suitable medium, including but not limited to wireless, wired, optical fiber, RF, etc., or any suitable combination thereof.

[0161] Program code for performing the operations of this application can be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Java and C++, and conventional procedural programming languages ​​such as C or similar languages. The program code can execute entirely on the user's computing device, partially on the user's device, as a standalone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server. In cases involving remote computing devices, the remote computing device can be connected to the user's computing device via any type of network, including a local area network (LAN) or a wide area network (WAN), or it can be connected to an external computing device (e.g., via the Internet using an Internet service provider).

[0162] In another respect, this application also provides an electronic device capable of implementing the above-described method.

[0163] Those skilled in the art will understand that various aspects of this application can be implemented as a system, method, or program product. Therefore, various aspects of this application can be specifically implemented in the following forms: a completely hardware implementation, a completely software implementation (including firmware, microcode, etc.), or a combination of hardware and software implementations, collectively referred to herein as a "circuit," "module," or "system."

[0164] The following reference Figure 4 To describe an electronic device 400 according to this embodiment of the present application. Figure 4 The electronic device 400 shown is merely an example and should not impose any limitations on the functionality and scope of use of the embodiments of this application.

[0165] like Figure 4 As shown, the electronic device 400 is manifested in the form of a general-purpose computing device. The components of the electronic device 400 may include, but are not limited to: at least one processing unit 410, at least one storage unit 420, and a bus 430 connecting different system components (including storage unit 420 and processing unit 410).

[0166] The storage unit stores program code that can be executed by the processing unit 410, causing the processing unit 410 to perform the steps described in the "Embodiment Methods" section above according to various exemplary embodiments of this application.

[0167] Storage unit 420 may include a readable medium in the form of a volatile storage unit, such as random access memory (RAM) 421 and / or cache memory 422, and may further include a read-only memory (ROM) 423.

[0168] Storage unit 420 may also include a program / utility 424 having a set (at least one) of program modules 425, such program modules 425 including but not limited to: an operating system, one or more application programs, other program modules, and program data, each or some combination of these examples may include an implementation of a network environment.

[0169] Bus 430 can represent one or more of several types of bus structures, including a memory cell bus or memory cell control node, a peripheral bus, a graphics acceleration port, a processing unit, or a local bus using any of the various bus structures.

[0170] Electronic device 400 can also communicate with one or more external devices 1200 (e.g., keyboard, pointing device, Bluetooth device, etc.), and with one or more devices that enable a user to interact with electronic device 400, and / or with any device that enables electronic device 400 to communicate with one or more other computing devices (e.g., router, modem, etc.). This communication can be performed via input / output (I / O) interface 450. Furthermore, electronic device 400 can also communicate with one or more networks (e.g., local area network (LAN), wide area network (WAN), and / or public networks, such as the Internet) via network adapter 460. As shown, network adapter 460 communicates with other modules of electronic device 400 via bus 430. It should be understood that, although not shown in the figures, other hardware and / or software modules can be used in conjunction with electronic device 400, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0171] Through the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein can be implemented by software or by combining software with necessary hardware. Therefore, the technical solutions according to the embodiments of this application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (such as a CD-ROM, USB flash drive, external hard drive, etc.) or on a network, including several instructions to cause a computing device (such as a personal computer, server, terminal device, or network device, etc.) to execute the method according to the embodiments of this application.

[0172] Furthermore, the above figures are merely illustrative of the processes included in the method according to exemplary embodiments of this application, and are not intended to be limiting. It is readily understood that the processes shown in the above figures do not indicate or limit the temporal order of these processes. Additionally, it is readily understood that these processes may be executed synchronously or asynchronously, for example, in multiple modules.

[0173] It should be understood that this application is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A method of strip rolling speed adjustment, characterized by, The method comprises: acquiring a target outlet thickness of a strip steel; determining a speed reduction mode of a cold rolling mill set based on the target outlet thickness; the speed reduction mode comprises a first speed reduction mode, a second speed reduction mode and a third speed reduction mode; performing a speed reduction test on the cold rolling mill set within a preset period based on the speed reduction mode to obtain a test result; the test result comprises a first test result, a second test result and a third test result; acquiring a speed parameter of a rolling mill of the cold rolling mill set and a position parameter of a stand of the cold rolling mill set according to the test result, comprising: if the test result is the first test result, acquiring a highest speed of the rolling mill, a shear speed, an entry roller speed, an acceleration corresponding to the first speed reduction mode and the position parameter of the stand; if the test result is the second test result, acquiring the highest speed of the rolling mill, the shear speed, the entry roller speed, the acceleration corresponding to the second speed reduction mode and the position parameter of the stand; if the test result is the third test result, acquiring the highest speed of the rolling mill, the shear speed, the entry roller speed, the acceleration corresponding to the third speed reduction mode and the position parameter of the stand; determining a target distance of the rolling mill for completing the speed reduction test based on the speed parameter, a scanning period corresponding to the preset period and the position parameter, comprising: calculating a target strip steel length required by an entry of the rolling mill based on the highest speed, the shear speed, the entry roller speed and the acceleration; determining a first target reserved length of the strip steel based on the scanning period and the entry roller speed; determining the target distance according to the target strip steel length, the first target reserved length, a preset second target reserved length and a speed reduction distance corresponding to the position parameter; the target distance is a sum of the target strip steel length, the first target reserved length, the second target reserved length and the speed reduction distance corresponding to the position parameter; adjusting the speed of the rolling mill to a target shear speed based on the target distance, so that the stand reduces speed when rolling a tail of the strip steel.

2. The strip rolling speed adjustment method according to claim 1, characterized in that, The method comprises: if the target outlet thickness is within a preset first thickness range, determining that the speed reduction mode is the first speed reduction mode; if the target outlet thickness is within a preset second thickness range, determining that the speed reduction mode is the second speed reduction mode; if the target outlet thickness is within a preset third thickness range, determining that the speed reduction mode is the third speed reduction mode.

3. The strip rolling speed adjustment method according to claim 2, characterized in that, The method comprises: if the speed reduction mode is the first speed reduction mode, performing a speed reduction test corresponding to the first speed reduction mode on the cold rolling mill set within the preset period to obtain the first test result; if the speed reduction mode is the second speed reduction mode, performing a speed reduction test corresponding to the second speed reduction mode on the cold rolling mill set within the preset period to obtain the second test result; if the speed reduction mode is the third speed reduction mode, performing a speed reduction test corresponding to the third speed reduction mode on the cold rolling mill set within the preset period to obtain the third test result. If the speed reduction mode is the third speed reduction mode, a speed reduction test corresponding to the third speed reduction mode is performed on the cold rolling mill set in the preset period to obtain the third test result.

4. The strip rolling speed adjustment method according to claim 3, characterized in that, The method further includes: dividing the rolling mill into a plurality of target regions; selecting a target region corresponding to the target distance as an automatic speed reduction region in the plurality of target regions based on the target distance; detecting the length of the strip tail of the strip based on the automatic speed reduction region and a detection device of the cold rolling mill set.

5. A strip rolling speed adjustment device for implementing the strip rolling speed adjustment method according to any one of claims 1 to 4, characterized by, The device includes: a first obtaining unit configured to obtain a target outlet thickness of a strip; a first determining unit configured to determine a speed reduction mode of a cold rolling mill set based on the target outlet thickness; a test unit configured to perform a speed reduction test on the cold rolling mill set in a preset period based on the speed reduction mode to obtain a test result; a second obtaining unit configured to obtain a speed parameter of a rolling mill of the cold rolling mill set and a position parameter of a rack of the cold rolling mill set according to the test result; a second determining unit configured to determine a target distance at which the rolling mill completes the speed reduction test based on the speed parameter, a scanning period corresponding to the preset period, and the position parameter; an adjusting unit configured to adjust the speed of the rolling mill to a target shearing speed based on the target distance, so that the rack reduces speed when rolling the strip tail of the strip.

6. A computer-readable storage medium, characterized in that, The computer readable storage medium stores at least one program code, and the at least one program code is loaded and executed by the processor to implement the operations performed by the method according to any one of claims 1 to 4.

7. An electronic device, comprising: The electronic device includes one or more processors and one or more memories, and the one or more memories store at least one program code, and the at least one program code is loaded and executed by the one or more processors to implement the operations performed by the method according to any one of claims 1 to 4.

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