Roller speed control method for avoiding steel accumulation in medium plate rolling

Abstract

The present invention discloses a rolling line roller speed control method for avoiding steel piling in medium plate rolling, comprising the following steps: 1. A roller operation status monitoring module acquires roller information and establishes an information file; 2. After each rolling pass, the roller operation status monitoring module acquires rolling data, calculates the pass wear amount of each roller and updates the wear profile curve; 3. The roller operation status monitoring module determines whether to enter the motor control activation state, if yes, executes step 4, otherwise executes step 5; 4. The roller operation status monitoring module calculates the roller body radius correction amount and writes it into the basic automatic control system of the rolling mill, and then goes to step 6; 5. The roller body radius correction amount is 0; 6. The basic automatic control system of the rolling mill sets the roller motor speed and controls the rotation of each roller motor. The present invention can effectively match the steel plate movement speed through the automatic control of the roller rotation speed, reduce the occurrence of steel piling and steel plate scratches, reduce the generation of scrap steel, and reduce production costs and economic losses.

Description

Technical Field

[0001] The invention relates to an automatic control method for a medium and thick plate production line, and in particular to a rolling line roller speed control method for avoiding steel piling during medium plate rolling. Background Art

[0002] The existing medium and thick plate rolling production line is usually equipped with one or two reversible rolling mills, among which the rolling mill for rolling finished products is called a finishing mill. There are multiple rollers for conveying steel plates before and after the rolling mill. Usually each roller is driven separately, and the roller is composed of a cylindrical roller body, a roller frame, a bearing, a coupling, a transmission motor, etc. The speed of the transmission motor is controlled by the basic automatic control system L1 of the rolling line.

[0003] When rolling thin-gauge medium plates on a medium and thick plate rolling line, after the steel plate is rolled to a thinner thickness (usually less than 10 mm), if the running speed of the steel plate is greater than the linear speed of the roller supporting it, the roller will generate reverse friction on the lower surface of the steel plate, hindering the advancement of the steel plate. If the shape of the steel plate fluctuates slightly at this time, it is easy to cause the cross-section of the steel plate to bend, forming a wavy pile of steel, which can only be lifted off the line and treated as scrap steel.

[0004] In order to avoid steel piling, the additional speed ratio of the roller and the rolling mill is increased in the basic automatic control system L1 of the rolling line through manual operation to ensure that the running speed of the steel plate is less than or equal to the linear speed of the roller, that is, the motor speed control value = rolling speed × (1.0 + forward slip coefficient) × additional speed ratio / roller body radius. The forward slip coefficient can be accurately calculated by forward slip adaptation and other methods, and the additional speed ratio coefficient is input into the basic automatic control system L1 of the rolling line by the operator based on experience. If the input value of the additional speed ratio coefficient is too large, the running speed of the steel plate is less than the linear speed of the roller, and a forward friction force is generated on the lower surface of the steel plate. When the surface material of the roller deteriorates and falls off, the rough roller surface will cause scratches on the lower surface of the steel plate, resulting in defective products. The additional speed proportional coefficient is highly dependent on the operator's experience. Due to the large number of rollers, the wear conditions and replacement time of each roller are different, and the wear amount at different positions on each roller is also different. The operator cannot grasp the actual operating status, that is, the wear condition of the roller in real time, accurately and completely. In actual operation, the control effect of the roller linear speed is not good, and the occurrence of steel piles and steel plate surface scratches cannot be avoided. In addition, the work efficiency is low and the labor intensity is high.

[0005] Chinese invention patent ZL201310393287.4 discloses a method to prevent the tail of the strip from being unwound before the coiler. The method adopts three measures: increasing the water volume of the cooling upper header, reducing the speed of the finishing mill, and increasing the speed difference of each section of the hot delivery roller. By controlling the speed difference between roller groups without differentiation, the risk of steel piling can be reduced to a certain extent, but the risk of scratching the lower surface of the steel plate is increased.

[0006] Chinese invention patent ZL201210083526.1 discloses a speed adaptive control method between a roller and a rolling mill, which changes the coordinated linkage between the roller speed and the rolling speed of the rolling mill into an independent roller speed adaptive control based on the output torque of the roller motor, ensuring that the motor output torque does not exceed the motor limit capacity. This method uses the torque limit value as the control target, which is only used for the control of the motor limit capacity, and cannot match the roller linear speed and rolling speed, and cannot reduce the incidence of rolling pile steel.

[0007] Chinese invention patent ZL201510329562.5 discloses a method for coordinated speed control of a medium and thick plate rolling mill and a tapered roller. According to the geometric relationship between the plate width and the shape and size of the tapered roller body, a more reasonable roller motor speed is given to reduce the speed difference between the steel plate and the contact part of the tapered section, thereby reducing roller wear. This method is applicable to tapered rollers, not cylindrical rollers, and the technical solution of this method is to reduce roller wear, but does not provide a solution for roller wear amount to control roller linear speed. Summary of the invention

[0008] The purpose of the present invention is to provide a rolling line roller speed control method for avoiding steel piling in medium plate rolling, which can effectively match the steel plate movement speed through automatic control of the roller rotation speed, reduce the occurrence of steel piling and steel plate scratches, reduce the generation of scrap steel, and reduce production costs and economic losses.

[0009] The present invention is achieved in that:

[0010] A rolling line roller speed control method for avoiding steel piling in medium plate rolling, characterized in that: the method is implemented based on a roller operation status monitoring module, and the roller operation status monitoring module is respectively connected to an equipment management system of a rolling production line, a rolling mill process control system, and a rolling mill basic automation control system;

[0011] The rolling line roller speed control method for avoiding steel piling during medium plate rolling comprises the following steps:

[0012] Step 1: The roller operation status monitoring module obtains roller information from the equipment management system and creates an information file for each roller;

[0013] Step 2: After each pass of steel plate rolling is completed, the roller operation status monitoring module obtains rolling data from the rolling mill process control system, calculates the pass wear amount of each roller according to the rolling data, and updates the wear profile curve of each roller;

[0014] Step 3: The roller operation status monitoring module obtains the rolling exit thickness from the rolling mill process control system and determines whether the motor control activation state is entered. If so, step 4 is executed; if not, step 5 is executed;

[0015] Step 4: The roller operation status monitoring module calculates the roller body radius correction value of each roller table, and writes the roller body radius correction value of each roller table into the basic automatic control system of the rolling mill in real time, and then goes to step 6;

[0016] Step 5: The roller operation status monitoring module writes in real time the roller body radius correction value of each roller into the basic automatic control system of the rolling mill as 0;

[0017] Step 6: The basic automatic control system of the rolling mill sets the roller motor speed of each roller according to the roller body radius correction value and controls the rotation of each roller motor;

[0018] The calculation formula for the given value ω of the roller motor speed is:

[0019]

[0020] Among them, v rt is the roller linear speed;

[0021] r dgn is the design radius of the roller body;

[0022] r corr It is the roller body radius correction amount.

[0023] The information file includes the position number of the roller, the rolling line coordinate value of the roller, the initial roller body diameter when the roller is replaced on line, and the wear profile curve of the roller.

[0024] In step 2, the method for updating the wear profile curve of the roller is:

[0025] Step 2.1: The roller operation status monitoring module determines whether the current roller is the roller at the rolling entrance side of the rolling mill. If so, step 2.2 is executed; if not, step 2.3 is executed;

[0026] Step 2.2: The roller operation status monitoring module determines whether the current roller is a roller involved in wear at the rolling entrance side. If so, step 2.4 is executed; if not, the wear profile curve update of the current roller is terminated;

[0027] Step 2.3: The roller operation status monitoring module determines whether the current roller is a roller involved in wear at the rolling exit side. If so, step 2.5 is executed; if not, the wear profile curve update of the current roller is terminated;

[0028] Step 2.4: The roller operation status monitoring module calculates the wear length of the current roller at the entrance side of the rolling entrance, and the calculation formula is:

[0029] The wear length involved on the inlet side = |the rolling line coordinate value of the tail of the steel plate at the beginning of the rolling of the currently completed rolling pass - the rolling line coordinate value of the current roller |;

[0030] Step 2.5: The roller operation status monitoring module calculates the wear length of the current roller at the exit side of the rolling exit. The calculation formula is:

[0031] The wear length involved at the exit side = |the rolling line coordinate value of the head of the steel plate at the beginning of the rolling of the currently completed rolling pass - the rolling line coordinate value of the current roller |;

[0032] Step 2.6: The roller operation status monitoring module calculates the current roller wear amount, and the calculation formula is:

[0033] Wear amount per pass = wear length involved × wear amount per unit steel plate length;

[0034] Among them, the involved wear length is the involved wear length on the inlet side or the involved wear length on the outlet side, that is, when the front roller is the roller involved in the wear on the rolling inlet side, the involved wear length is the involved wear length on the inlet side, and when the front roller is the roller involved in the wear on the rolling outlet side, the involved wear length is the involved wear length on the outlet side;

[0035] The wear amount per unit steel plate length is estimated based on the actual wear amount measured during the scheduled repair, and the value range is -10 -5 ~-10 -7 mm;

[0036] Step 2.7: The roller operation status monitoring module calculates the wear values ​​of all the contour feature points involved in wear on the current roller;

[0037] Step 2.8: The roller operation status monitoring module updates the wear profile curve of the current roller according to the wear value.

[0038] In the step 2.1, the method for determining whether the current roller is the roller at the rolling entrance side of the rolling mill is:

[0039] If the currently completed pass is a forward rolling pass, and the rolling line coordinate value of the current roller is less than the rolling line coordinate value of the rolling mill, the current roller is the rolling entrance side roller of the rolling mill, otherwise the current roller is the rolling exit side roller of the rolling mill;

[0040] If the currently completed pass is a reverse rolling pass, and the rolling line coordinate value of the current roller is greater than the rolling line coordinate value of the rolling mill, the current roller is the rolling entrance side roller of the rolling mill, otherwise the current roller is the rolling exit side roller of the rolling mill;

[0041] Among them, the forward rolling pass and the reverse rolling pass are determined according to the rolling direction in the rolling mill process control system.

[0042] In the step 2.2, the method for judging whether the current roller is a roller involving wear on the rolling inlet side is:

[0043] In each rolling pass, the end of the steel plate that first enters the rolling mill for rolling is set as the head, and the end that last enters the rolling mill for rolling is set as the tail;

[0044] If the currently completed pass is a forward rolling pass, and the rolling line coordinate value of the current roller is greater than the rolling line coordinate value of the tail of the steel plate at the beginning of the currently completed rolling pass, then the current roller is a roller involving wear on the rolling entrance side, otherwise it is a roller not involving wear on the rolling entrance side;

[0045] The calculation formula of the rolling line coordinate value of the tail of the steel plate at the beginning of the forward rolling pass is: rolling line coordinate value of the tail of the steel plate = rolling line coordinate value of the rolling mill - rolling entrance length of the rolling pass, and the rolling entrance length is obtained from the rolling mill process control system;

[0046] If the currently completed pass is a reverse rolling pass, and the rolling line coordinate value of the current roller is less than the rolling line coordinate value of the tail of the steel plate at the beginning of the currently completed rolling pass, then the current roller is a roller involving wear on the rolling entrance side, otherwise it is a roller not involving wear on the rolling entrance side;

[0047] Among them, the calculation formula for the rolling line coordinate value of the tail of the steel plate at the beginning of the reverse rolling pass is: the rolling line coordinate value of the tail of the steel plate = the rolling line coordinate value of the rolling mill + the rolling entrance length of the rolling pass, and the rolling entrance length is obtained from the rolling mill process control system.

[0048] In the step 2.3, the method for judging whether the current roller is a roller involved in wear at the rolling exit side is:

[0049] In each rolling pass, the end of the steel plate that first enters the rolling mill for rolling is set as the head, and the end that last enters the rolling mill for rolling is set as the tail;

[0050] If the currently completed pass is a forward rolling pass, and the rolling line coordinate value of the current roller is less than the rolling line coordinate value of the steel plate head at the end of the currently completed rolling pass, then the current roller is a roller involving wear on the rolling exit side, otherwise it is a roller not involving wear on the rolling exit side;

[0051] The calculation formula of the rolling line coordinate value of the steel plate head at the end of the forward rolling pass is: the rolling line coordinate value of the steel plate head = the rolling line coordinate value of the rolling mill + the rolling exit length of the rolling pass, and the rolling exit length is obtained from the rolling mill process control system;

[0052] If the currently completed pass is a reverse rolling pass, and the rolling line coordinate value of the current roller is less than the rolling line coordinate value of the steel plate head at the end of the currently completed rolling pass, then the current roller is the roller involved in wear on the rolling exit side, otherwise it is the roller not involved in wear on the rolling exit side;

[0053] Among them, the calculation formula for the rolling line coordinate value of the steel plate head at the end of the reverse rolling pass is: the rolling line coordinate value of the steel plate head = the rolling line coordinate value of the rolling mill - the rolling exit length of the rolling pass, and the rolling exit length is obtained from the rolling mill process control system.

[0054] The step 2.7 includes:

[0055] Step 2.7.1: Take N contour feature points at equal distances along the axial direction of the current roller, where the value range of N is 5-100;

[0056] Step 2.7.2: Set the center of the steel plate in the width direction to be located at the center of the current roller length direction, and the contour feature points covered in the width direction of the steel plate are the contour feature points involved in wear;

[0057] Step 2.7.3: Calculate the wear value at each contour feature point involved in wear. The calculation formula is:

[0058] The wear value at the contour feature point involved in wear = the original wear value at the contour feature point + the wear amount of the pass;

[0059] Among them, the original wear value at the profile feature point is the wear value calculated at the profile feature point in the previous rolling pass. When performing the first rolling pass, the original wear value at the profile feature point is the wear value when the roller is replaced on line.

[0060] In the step 3, the condition for entering the motor control activation state is: the rolling outlet thickness is less than 10 mm.

[0061] In the step 4, the calculation formula of the roller body radius correction amount of each roller is: roller body radius correction amount = initial roller body diameter when the roller is replaced / 2 + equivalent wear amount - roller body design radius of the roller;

[0062] The calculation method of the equivalent wear amount is as follows: arrange the wear values ​​at all the contour feature points involved in wear on the current roller from large to small, and calculate the average value of the wear values ​​arranged in the first 30%, and use the average value as the equivalent wear amount.

[0063] Compared with the prior art, the present invention has the following beneficial effects:

[0064] 1. The present invention is provided with a roller operation status monitoring module, which is directly connected to the control system of the production line, namely, the rolling mill process control system and the rolling mill basic automation control system. It can make full use of the existing equipment and its data information on the rolling production line to calculate the wear amount of the roller in real time and accurately, so as to set the given value of the roller rotation speed according to the wear condition of the roller, so that the roller rotation speed is effectively matched with the movement speed of the steel plate, so as to achieve the purpose of avoiding steel piling and steel plate scratches.

[0065] 2. The present invention establishes an information file of the roller, and can monitor the wear of each roller in real time and dynamically update the wear profile curve, which is helpful for understanding the operating status of the roller and is used to guide the replacement of the roller. It does not need to rely on the manually set additional speed proportional coefficient, and can effectively improve the accuracy of the roller line speed control and reduce the labor intensity of the staff.

[0066] 3. The present invention is equipped with a roller operation status monitoring module, which is integrated with the equipment and system of the existing medium and thick plate rolling production line to improve the degree of automation of steel plate rolling, thereby improving the quality and efficiency of steel plate production and reducing quality losses and economic losses in the production of thin-gauge medium plates.

[0067] The present invention can make full use of the existing equipment and data information of the production line, effectively match the movement speed of the steel plate through the automatic control of the roller rotation speed, reduce the occurrence of steel piling and steel plate scratches, reduce the generation of scrap steel, reduce production costs and economic losses, and can be promoted and used in various types of steel plate rolling production lines, with a wide range of adaptability, and is particularly suitable for the rolling production of medium and thick plates. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] Figure 1 It is a flow chart of a rolling line roller speed control method for avoiding steel piling in medium plate rolling according to the present invention;

[0069] Figure 2 It is a flow chart of step 2 in the rolling line roller speed control method for avoiding steel piling in medium plate rolling of the present invention. DETAILED DESCRIPTION

[0070] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0071] A rolling line roller speed control method for avoiding steel piling in medium plate rolling is implemented based on a roller operation status monitoring module. The roller operation status monitoring module is respectively connected to the existing equipment management system, the rolling mill process control system L2 and the rolling mill basic automation control system L1 on the rolling production line.

[0072] The equipment management system is used to store roller information, which is input by the equipment management personnel. After each roller replacement, the equipment management personnel inputs the roller position number, roller diameter of the replaced roller and other information into the equipment management system.

[0073] The rolling mill process control system L2 is used to control the rolling of steel plates and store rolling data such as the rolling mill number, rolling direction, rolling entrance length, rolling entrance width, rolling exit length, rolling exit width, and rolling exit thickness of each rolling pass.

[0074] The basic automation control system L1 of the rolling mill is used to control the rotation speed of the roller motor.

[0075] Please see attached Figure 1 The rolling line roller speed control method for avoiding steel piling during medium plate rolling comprises the following steps:

[0076] Step 1: The roller operation status monitoring module obtains roller information from the equipment management system and creates an information file for each roller.

[0077] The information file includes the position number of the roller, the rolling line coordinate value of the roller, the initial roller body diameter when the roller is replaced on line, and the wear profile curve of the roller.

[0078] The method for determining the rolling line coordinate value of the roller is as follows: the rolling line is used as a one-dimensional coordinate system, a known position (such as the roller farthest from the heating furnace) is used as the origin, the coordinate value of the known position is 0m, and the distance between the roller and the known position is the rolling line coordinate value of the roller. In this way, the rolling line coordinate value of the rolling mill and the rolling line coordinate values ​​of the head and tail of the steel plate on the roller can also be determined.

[0079] Step 2: After each pass of steel plate rolling is completed, the roller operation status monitoring module obtains rolling data from the rolling mill process control system L2. The roller operation status monitoring module calculates the pass wear amount of each roller according to the rolling data and updates the wear profile curve of each roller.

[0080] Please see attached Figure 2 The method for updating the wear profile curve of the roller is:

[0081] Step 2.1: The roller operation status monitoring module determines whether the current roller is the roller at the rolling entrance side of the rolling mill. If so, execute step 2.2; if not, execute step 2.3.

[0082] The method for judging whether the current roller is the roller at the rolling entrance side of the rolling mill is:

[0083] If the currently completed pass is a forward rolling pass, and the rolling line coordinate value of the current roller is less than the rolling line coordinate value of the rolling mill, the current roller is the rolling entrance side roller of the rolling mill, otherwise the current roller is the rolling exit side roller of the rolling mill.

[0084] If the currently completed pass is a reverse rolling pass, and the rolling line coordinate value of the current roller is greater than the rolling line coordinate value of the rolling mill, the current roller is the rolling entrance side roller of the rolling mill, otherwise the current roller is the rolling exit side roller of the rolling mill.

[0085] The forward rolling pass and the reverse rolling pass are determined according to the rolling direction in the rolling mill process control system L2.

[0086] Step 2.2: The roller operation status monitoring module determines whether the current roller is a roller involved in wear on the rolling entrance side. If so, step 2.4 is executed; if not, the wear profile curve update of the current roller is terminated.

[0087] The method for judging whether the current roller is a roller involving wear on the rolling inlet side is:

[0088] In each rolling pass, the end of the steel plate that first enters the rolling mill for rolling is set as the head, and the end that last enters the rolling mill for rolling is set as the tail.

[0089] If the currently completed pass is a forward rolling pass, and the rolling line coordinate value of the current roller is greater than the rolling line coordinate value of the tail of the steel plate at the beginning of rolling in the currently completed rolling pass, then the current roller is a roller involved in wear on the rolling entrance side, otherwise it is a roller not involved in wear on the rolling entrance side.

[0090] The calculation formula of the rolling line coordinate value of the tail of the steel plate at the beginning of the forward rolling pass is: rolling line coordinate value of the tail of the steel plate = rolling line coordinate value of the rolling mill - rolling entrance length of the rolling pass. The rolling entrance length is obtained from the rolling mill process control system L2.

[0091] If the currently completed pass is a reverse rolling pass, and the rolling line coordinate value of the current roller is less than the rolling line coordinate value of the tail of the steel plate at the beginning of rolling in the currently completed rolling pass, then the current roller is the roller involved in wear on the rolling entrance side, otherwise it is the roller not involved in wear on the rolling entrance side.

[0092] The calculation formula of the rolling line coordinate value of the tail of the steel plate at the beginning of the reverse rolling pass is: rolling line coordinate value of the tail of the steel plate = rolling line coordinate value of the rolling mill + rolling entrance length of the rolling pass. The rolling entrance length is obtained from the rolling mill process control system L2.

[0093] Step 2.3: The roller operation status monitoring module determines whether the current roller is a roller involved in wear on the rolling exit side. If so, step 2.5 is executed; if not, the wear profile curve update of the current roller is terminated.

[0094] The method for judging whether the current roller is a roller involved in wear at the rolling exit side is:

[0095] In each rolling pass, the end of the steel plate that first enters the rolling mill for rolling is set as the head, and the end that last enters the rolling mill for rolling is set as the tail.

[0096] If the currently completed pass is a forward rolling pass, and the rolling line coordinate value of the current roller is less than the rolling line coordinate value of the steel plate head at the end of the currently completed rolling pass, then the current roller is the roller involved in wear on the rolling exit side, otherwise it is the roller not involved in wear on the rolling exit side.

[0097] The calculation formula of the rolling line coordinate value of the steel plate head at the end of the forward rolling pass is: rolling line coordinate value of the steel plate head = rolling line coordinate value of the rolling mill + rolling exit length of the rolling pass. The rolling exit length is obtained from the rolling mill process control system L2.

[0098] If the currently completed pass is a reverse rolling pass, and the rolling line coordinate value of the current roller is less than the rolling line coordinate value of the steel plate head at the end of the currently completed rolling pass, then the current roller is the roller involved in wear on the rolling exit side, otherwise it is the roller not involved in wear on the rolling exit side.

[0099] The calculation formula of the rolling line coordinate value of the steel plate head at the end of the reverse rolling pass is: rolling line coordinate value of the steel plate head = rolling line coordinate value of the rolling mill - rolling exit length of the rolling pass. The rolling exit length is obtained from the rolling mill process control system L2.

[0100] Step 2.4: The roller operation status monitoring module calculates the wear length of the current roller at the entrance side of the rolling entrance, and the calculation formula is:

[0101] The wear length involved on the entry side = |the rolling line coordinate value of the tail of the steel plate at the beginning of the rolling of the currently completed rolling pass - the rolling line coordinate value of the current roller |.

[0102] Step 2.5: The roller operation status monitoring module calculates the wear length of the current roller at the exit side of the rolling exit. The calculation formula is:

[0103] The wear length involved on the exit side = |the rolling line coordinate value of the head of the steel plate at the beginning of the rolling of the currently completed rolling pass - the rolling line coordinate value of the current roller table|.

[0104] Step 2.6: The roller operation status monitoring module calculates the current roller wear amount, and the calculation formula is:

[0105] Wear amount per pass = wear length involved × wear amount per unit steel plate length.

[0106] Among them, the wear length involved is the wear length involved on the inlet side or the wear length involved on the outlet side, that is, when the current roller is the roller involved in wear on the rolling inlet side, the wear length involved is the wear length involved on the inlet side; when the current roller is the roller involved in wear on the rolling outlet side, the wear length involved is the wear length involved on the outlet side.

[0107] The wear amount per unit steel plate length is estimated based on the actual wear amount measured during the scheduled repair, and the value range is -10 -5 ~-10 -7 mm.

[0108] Step 2.7: The roller operation status monitoring module calculates the wear values ​​of all the contour feature points involved in wear on the current roller.

[0109] Step 2.7.1: Take N contour feature points at equal distances along the axial direction of the current roller, and the value range of N is 5-100.

[0110] Step 2.7.2: Set the center of the steel plate in the width direction to be located at the center of the current roller length direction, that is, the steel plate is placed in the center of the roller, and the contour feature points covered in the width direction of the steel plate are the contour feature points involved in wear.

[0111] Step 2.7.3: Calculate the wear value at each contour feature point involved in wear. The calculation formula is:

[0112] The wear value at the contour feature point involved in wear = the original wear value at the contour feature point + the pass wear amount.

[0113] The original wear value at the profile feature point is the wear value calculated at the profile feature point in the previous rolling pass. When the first rolling pass is performed, the original wear value at the profile feature point is the wear value when the roller is replaced, which can be measured by a measuring instrument in the prior art. If there is no wear at a profile feature point on the roller, the wear value at the profile feature point is defined as 0.

[0114] Step 2.8: The roller operation status monitoring module updates the wear profile curve of the current roller according to the wear value.

[0115] Step 3: The roller operation status monitoring module obtains the rolling exit thickness from the rolling mill process control system L2 and determines whether the motor control activation state is entered. If so, execute step 4; if not, execute step 5.

[0116] The entry condition of the motor control activation state is: the rolling outlet thickness is less than 10mm.

[0117] Step 4: The roller operation status monitoring module calculates the roller body radius correction value of each roller, and writes the roller body radius correction value of each roller into the rolling mill basic automation control system L1 in real time, and then goes to step 6.

[0118] The calculation formula for the roller body radius correction amount of each roller is: roller body radius correction amount = initial roller body diameter when the roller is replaced / 2 + equivalent wear amount - roller body design radius of the roller.

[0119] The calculation method of equivalent wear is: arrange the wear values ​​of all the contour feature points involved in wear on the current roller from large to small, and calculate the average value of the wear values ​​arranged in the first 30%, and use the average value as the equivalent wear value.

[0120] Step 5: The roller operation status monitoring module writes in real time the roller body radius correction value of each roller into the basic automation control system L1 of the rolling mill as 0.

[0121] Step 6: The basic automatic control system L1 of the rolling mill sets the roller motor speed of each roller according to the roller body radius correction value and controls the rotation of each roller motor.

[0122] The calculation formula for the given value ω (unit: rpm) of the roller motor speed is:

[0123]

[0124] Among them, v rt is the roller linear speed (in mm / s);

[0125] r dgn is the design radius of the roller body (in millimeters);

[0126] r corr It is the roller body radius correction (unit: mm).

[0127] Embodiment 1:

[0128] The present invention is applied to a 5-meter production line for rolling medium and thick plates. Two reversible rolling mills are arranged on the production line. A number of rollers are arranged before and after the rolling mills for conveying steel plates. A one-dimensional coordinate system is established with the roller farthest from the heating furnace as the origin, i.e., 0m. The rolling line coordinate value of the rolling mill is 180m.

[0129] Take a roller after the rolling mill as an example. The roller body length of the roller is 5m, the roller body design diameter is 500mm, and N = 100 contour feature points are taken at equal distances on the roller body. The roller operation status monitoring module is connected to the equipment management system of the rolling production line, the rolling mill process control system L2, and the rolling mill basic automation control system L1 respectively.

[0130] When the roller is replaced, the equipment manager inputs the position number of the roller and the designed roller diameter of 500mm into the equipment management system. When the roller is replaced, the wear values ​​at the upper 100 contour feature points are all -1.0mm. The information file established by the roller operation status monitoring module for the roller includes the position number of the roller, the rolling line coordinate value of 200m, the initial roller diameter of 500mm when the roller is replaced, and the wear contour curve of the roller is cleared.

[0131] One year after the roller was replaced, the steel plate rolling of the Mth rolling pass was completed. The roller operation status monitoring module obtains rolling data from the rolling mill process control system L2, including the rolling direction is the forward rolling pass, the entrance length is 15m, the entrance width is 4m, the exit length is 18m, the exit width is 4m, and the exit thickness is 25mm.

[0132] According to the rolling direction, the rolling line coordinate value of the roller 200m is greater than the rolling line coordinate value of the rolling mill 180m, and the roller operation status monitoring module determines that the roller is the roller on the rolling exit side of the rolling mill. At the end of the Mth rolling pass, the rolling line coordinate value of the steel plate head = the rolling line coordinate value of the rolling mill + the rolling exit length of the rolling pass = 180 + 18 = 198m < the rolling line coordinate value of the roller 200m, and the roller operation status monitoring module determines that the roller is not involved in the roller on the rolling exit side, and ends the update of the wear profile curve of the roller in the Mth rolling pass.

[0133] After the M+1th rolling pass is completed, the roller operation status monitoring module obtains rolling data from the rolling mill process control system L2, including the rolling direction is a reverse rolling pass, the entrance length is 18m, the entrance width is 4m, the exit length is 25m, the exit width is 4m, the exit thickness is 20mm, etc.

[0134] According to the rolling direction, the rolling line coordinate value of the roller 200m is greater than the rolling line coordinate value of the rolling mill 180m, and the roller operation status monitoring module determines that the roller is the roller on the rolling entrance side of the rolling mill. The rolling line coordinate value of the tail of the steel plate at the start of the M+1 rolling pass = the rolling line coordinate value of the rolling mill + the rolling entrance length of the rolling pass = 180 + 18 = 198m < the rolling line coordinate value of the roller 200m, and the roller operation status monitoring module determines that the roller is not involved in the roller on the rolling entrance side, and ends the update of the wear profile curve of the roller in the M+1 rolling pass.

[0135] After the M+2th rolling pass is completed, the roller operation status monitoring module obtains rolling data from the rolling mill process control system L2, including the rolling direction is a forward rolling pass, the entrance length is 25m, the entrance width is 4m, the exit length is 35m, the exit width is 4m, the exit thickness is 15mm, etc.

[0136] According to the rolling direction, the rolling line coordinate value of the roller is 200m greater than the rolling line coordinate value of the rolling mill, 180m, and the roller operation status monitoring module determines that the roller is the roller on the rolling exit side of the rolling mill. At the end of the M+2 rolling pass, the rolling line coordinate value of the steel plate head = the rolling line coordinate value of the rolling mill + the rolling exit length of the rolling pass = 180 + 35 = 215m > the rolling line coordinate value of the roller 200m, and the roller operation status monitoring module determines that the roller is a roller involved in wear on the rolling exit side.

[0137] The wear length involved in calculating the outlet side = |the rolling line coordinate value of the steel plate head at the end of the M+2 rolling pass - the rolling line coordinate value of the current roller | = |215-200| = 15m.

[0138] In this embodiment, the wear amount per unit steel plate length is -10 -5 mm, calculated wear amount per pass = wear length involved on the outlet side × wear amount per unit steel plate length = 15 × (-10 -5 )=-1.5×10 -4 mm.

[0139] The steel plate is placed at the center of the roller, and the steel plate covers the 20th to 80th contour feature points. The 20th to 80th contour feature points are taken as the contour feature points involving wear. The wear value of the 20th to 80th contour feature points is calculated as -1.0+(-1.5×10 -4 )=-1.00015mm. The roller operation status monitoring module updates the wear profile curve of the roller.

[0140] After the M+3 rolling pass is completed, the roller operation status monitoring module obtains rolling data from the rolling mill process control system L2, including the rolling direction is reverse rolling pass, the entrance length is 35m, the entrance width is 4m, the exit length is 45m, the exit width is 4m, the exit thickness is 11mm, etc.

[0141] According to the rolling direction, the rolling line coordinate value of the roller is 200m greater than the rolling line coordinate value of the rolling mill, 180m, and the roller operation status monitoring module determines that the roller is the roller on the rolling entrance side of the rolling mill. The rolling line coordinate value of the tail of the steel plate at the beginning of the M+3 rolling pass = the rolling line coordinate value of the rolling mill + the rolling entrance length of the rolling pass = 180 + 35 = 215m > the rolling line coordinate value of the roller 200m, and the roller operation status monitoring module determines that the roller is a roller involved in wear on the rolling entrance side.

[0142] The wear length involved in calculating the entrance side = |the rolling line coordinate value of the tail of the steel plate at the beginning of rolling in the M+2th rolling pass - the rolling line coordinate value of the current roller | = |215-200| = 15m.

[0143] Calculated wear amount per pass = wear length involved on the inlet side × wear amount per unit steel plate length = 15 × (-10 -5 )=-1.5×10 -4 mm.

[0144] The steel plate is placed at the center of the roller, and the steel plate covers the 20th to 80th contour feature points. The 20th to 80th contour feature points are taken as the contour feature points involving wear. The wear value of the 20th to 80th contour feature points is calculated as -1.00015+(-1.5×10 -4 )=-1.0003mm. The roller operation status monitoring module updates the wear profile curve of the roller.

[0145] During the rolling of the Mth to M+3th rolling passes, the roller operation status monitoring module obtains from the rolling mill process control system L2 that the exit thickness is all >10mm, and the motor control activation state is not entered. The roller operation status monitoring module writes in real time the roller body radius correction value of each roller into the rolling mill basic automation control system L1 as 0.

[0146] After the M+4th rolling pass is completed, the roller operation status monitoring module obtains from the rolling mill process control system L2 that the exit thickness is 9mm<10mm and enters the motor control activation state.

[0147] The wear values ​​at all the profile feature points involved in wear on the roller (i.e. the 20th to 80th profile feature points) are arranged from large to small, and the average value of the first 30% of the wear values ​​in the series is calculated, and the average value is used as the equivalent wear amount = -1.0003mm.

[0148] The roller body radius correction amount of the roller is calculated as follows: initial roller body diameter when the roller is replaced / 2 + equivalent wear amount - design roller body radius of the roller = 500 / 2 + (-1.0003) - 500 / 2 = -1.0003 mm.

[0149] In this embodiment, the roller linear speed v is obtained from the rolling mill basic automation control system L1 rt 5.0×10 3 mm / s, calculate the given value of the roller motor speed The basic automatic control system L1 of the rolling mill controls the rotation of the roller motor according to the given value ω. The rotation regulation of the roller motor effectively reduces the incidence of steel pile-up and can reduce production costs by about 0.05%.

[0150] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for controlling the speed of a rolling line roller to avoid steel piling during medium plate rolling, characterized in that: The method is implemented based on a roller table operation status monitoring module, which is respectively connected to an equipment management system of a rolling production line, a rolling mill process control system and a rolling mill basic automation control system; The rolling line roller speed control method for avoiding steel piling during medium plate rolling comprises the following steps: Step 1: The roller operation status monitoring module obtains roller information from the equipment management system and creates an information file for each roller; Step 2: After each pass of steel plate rolling is completed, the roller operation status monitoring module obtains rolling data from the rolling mill process control system, calculates the pass wear amount of each roller according to the rolling data, and updates the wear profile curve of each roller; Step 3: The roller operation status monitoring module obtains the rolling exit thickness from the rolling mill process control system and determines whether the motor control activation state is entered. If yes, step 4 is executed; if not, step 5 is executed; Step 4: The roller operation status monitoring module calculates the roller body radius correction value of each roller table, and writes the roller body radius correction value of each roller table into the basic automatic control system of the rolling mill in real time, and then goes to step 6; Step 5: The roller operation status monitoring module writes in real time the roller body radius correction value of each roller into the basic automation control system of the rolling mill as 0; Step 6: The basic automatic control system of the rolling mill sets the roller motor speed of each roller according to the roller body radius correction value and controls the rotation of each roller motor; The calculation formula for the given value ω of the roller motor speed is: Among them, v rt is the roller linear speed; r dgn is the design radius of the roller body; r corr It is the roller body radius correction amount.

2. The rolling line roller speed control method for avoiding steel piling in medium plate rolling according to claim 1 is characterized by: The information file includes the position number of the roller, the rolling line coordinate value of the roller, the initial roller body diameter when the roller is replaced on line, and the wear profile curve of the roller.

3. The rolling line roller speed control method for avoiding steel piling in medium plate rolling according to claim 1 is characterized by: In step 2, the method for updating the wear profile curve of the roller is: Step 2.1: The roller operation status monitoring module determines whether the current roller is the roller at the rolling entrance side of the rolling mill. If so, step 2.2 is executed; if not, step 2.3 is executed; Step 2.2: The roller operation status monitoring module determines whether the current roller is a roller involved in wear at the rolling entrance side. If so, step 2.4 is executed; if not, the wear profile curve update of the current roller is terminated; Step 2.3: The roller operation status monitoring module determines whether the current roller is a roller involved in wear at the rolling exit side. If so, step 2.5 is executed; if not, the wear profile curve update of the current roller is terminated; Step 2.4: The roller operation status monitoring module calculates the wear length of the current roller at the entrance side of the rolling entrance, and the calculation formula is: The wear length involved on the inlet side = |the rolling line coordinate value of the tail of the steel plate at the beginning of the rolling of the currently completed rolling pass - the rolling line coordinate value of the current roller |; Step 2.5: The roller operation status monitoring module calculates the wear length of the current roller at the exit side of the rolling exit. The calculation formula is: The wear length involved at the exit side = |the rolling line coordinate value of the head of the steel plate at the beginning of the rolling of the currently completed rolling pass - the rolling line coordinate value of the current roller |; Step 2.6: The roller operation status monitoring module calculates the current roller wear amount, and the calculation formula is: Wear amount per pass = wear length involved × wear amount per unit steel plate length; Among them, the involved wear length is the involved wear length on the inlet side or the involved wear length on the outlet side, that is, when the front roller is the roller involved in the wear on the rolling inlet side, the involved wear length is the involved wear length on the inlet side, and when the front roller is the roller involved in the wear on the rolling outlet side, the involved wear length is the involved wear length on the outlet side; The wear amount per unit steel plate length is estimated based on the actual wear amount measured during the scheduled repair, and the value range is -10 -5 ~-10 - 7 mm; Step 2.7: The roller operation status monitoring module calculates the wear values ​​of all the contour feature points involved in wear on the current roller; Step 2.8: The roller operation status monitoring module updates the wear profile curve of the current roller according to the wear value.

4. The rolling line roller speed control method for avoiding steel piling in medium plate rolling according to claim 3 is characterized by: In the step 2.1, the method for determining whether the current roller is the roller at the rolling entrance side of the rolling mill is: If the currently completed pass is a forward rolling pass, and the rolling line coordinate value of the current roller is less than the rolling line coordinate value of the rolling mill, the current roller is the rolling entrance side roller of the rolling mill, otherwise the current roller is the rolling exit side roller of the rolling mill; If the currently completed pass is a reverse rolling pass, and the rolling line coordinate value of the current roller is greater than the rolling line coordinate value of the rolling mill, the current roller is the rolling entrance side roller of the rolling mill, otherwise the current roller is the rolling exit side roller of the rolling mill; Among them, the forward rolling pass and the reverse rolling pass are determined according to the rolling direction in the rolling mill process control system.

5. The rolling line roller speed control method for avoiding steel piling in medium plate rolling according to claim 3 is characterized by: In the step 2.2, the method for judging whether the current roller is a roller involving wear on the rolling inlet side is: In each rolling pass, the end of the steel plate that first enters the rolling mill for rolling is set as the head, and the end that last enters the rolling mill for rolling is set as the tail; If the currently completed pass is a forward rolling pass, and the rolling line coordinate value of the current roller is greater than the rolling line coordinate value of the tail of the steel plate at the beginning of the currently completed rolling pass, then the current roller is a roller involving wear on the rolling entrance side, otherwise it is a roller not involving wear on the rolling entrance side; The calculation formula of the rolling line coordinate value of the tail of the steel plate at the beginning of the forward rolling pass is: rolling line coordinate value of the tail of the steel plate = rolling line coordinate value of the rolling mill - rolling entrance length of the rolling pass, and the rolling entrance length is obtained from the rolling mill process control system; If the currently completed pass is a reverse rolling pass, and the rolling line coordinate value of the current roller is less than the rolling line coordinate value of the tail of the steel plate at the beginning of the currently completed rolling pass, then the current roller is a roller involving wear on the rolling entrance side, otherwise it is a roller not involving wear on the rolling entrance side; Among them, the calculation formula for the rolling line coordinate value of the tail of the steel plate at the beginning of the reverse rolling pass is: the rolling line coordinate value of the tail of the steel plate = the rolling line coordinate value of the rolling mill + the rolling entrance length of the rolling pass, and the rolling entrance length is obtained from the rolling mill process control system.

6. The rolling line roller speed control method for avoiding steel piling in medium plate rolling according to claim 3 is characterized by: In the step 2.3, the method for judging whether the current roller is a roller involved in wear at the rolling exit side is: In each rolling pass, the end of the steel plate that first enters the rolling mill for rolling is set as the head, and the end that last enters the rolling mill for rolling is set as the tail; If the currently completed pass is a forward rolling pass, and the rolling line coordinate value of the current roller is less than the rolling line coordinate value of the steel plate head at the end of the currently completed rolling pass, then the current roller is a roller involving wear on the rolling exit side, otherwise it is a roller not involving wear on the rolling exit side; The calculation formula of the rolling line coordinate value of the steel plate head at the end of the forward rolling pass is: the rolling line coordinate value of the steel plate head = the rolling line coordinate value of the rolling mill + the rolling exit length of the rolling pass, and the rolling exit length is obtained from the rolling mill process control system; If the currently completed pass is a reverse rolling pass, and the rolling line coordinate value of the current roller is less than the rolling line coordinate value of the steel plate head at the end of the currently completed rolling pass, then the current roller is the roller involved in wear on the rolling exit side, otherwise it is the roller not involved in wear on the rolling exit side; Among them, the calculation formula for the rolling line coordinate value of the steel plate head at the end of the reverse rolling pass is: the rolling line coordinate value of the steel plate head = the rolling line coordinate value of the rolling mill - the rolling exit length of the rolling pass, and the rolling exit length is obtained from the rolling mill process control system.

7. The rolling line roller speed control method for avoiding steel piling in medium plate rolling according to claim 3 is characterized by: The step 2.7 includes: Step 2.7.1: Take N contour feature points at equal distances along the axial direction of the current roller, where the value range of N is 5-100; Step 2.7.2: Set the center of the steel plate in the width direction to be located at the center of the current roller length direction, and the contour feature points covered in the width direction of the steel plate are the contour feature points involved in wear; Step 2.7.3: Calculate the wear value at each contour feature point involved in wear. The calculation formula is: The wear value at the contour feature point involved in wear = the original wear value at the contour feature point + the wear amount of the pass; Among them, the original wear value at the profile feature point is the wear value calculated at the profile feature point in the previous rolling pass. When performing the first rolling pass, the original wear value at the profile feature point is the wear value when the roller is replaced on line.

8. The rolling line roller speed control method for avoiding steel piling in medium plate rolling according to claim 1 is characterized by: In the step 3, the condition for entering the motor control activation state is: the rolling outlet thickness is less than 10 mm.

9. The rolling line roller speed control method for avoiding steel piling in medium plate rolling according to claim 1 is characterized by: In step 4, the calculation formula for the roller body radius correction of each roller is: Roller body radius correction = initial roller body diameter when the roller is replaced / 2 + equivalent wear amount - roller body design radius of the roller; The calculation method of the equivalent wear amount is as follows: arrange the wear values ​​at all the contour feature points involved in wear on the current roller from large to small, and calculate the average value of the wear values ​​arranged in the first 30%, and use the average value as the equivalent wear amount.

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