Strip finishing line tension distribution calculation and motor selection method and system

Abstract

The application provides a strip finishing line tension distribution calculation and motor selection method and system, which comprises the following steps: determining the tension requirement value of the strip to be processed at the entrance of a straightening machine in the strip finishing line according to the width, thickness and yield strength limit of the strip to be processed; gradually deriving the tension requirement value at each tension roller in the strip finishing line from front to back according to the tension requirement value of the strip to be processed at the entrance of the straightening machine; determining the basic parameters of the required motor at each tension roller according to the tension requirement value at each tension roller, and selecting the motor according to the basic parameters of the motor; calculating the output torque of the selected motor at each tension roller under the rated power, and calculating the actual output tension at each tension roller according to the output torque of the motor, the reduction ratio and the acting diameter; comparing the actual output tension at each tension roller with the tension requirement value, and determining whether the selection of the motor meets the production requirement. The application realizes automatic and accurate motor selection.

Description

Technical Field

[0001] This invention relates to the field of strip steel processing technology, and in particular to a method and system for calculating tension distribution and selecting motors in a strip steel finishing line. Background Technology

[0002] A strip steel finishing line is a processing line that performs surface treatment and shape leveling on strip steel. In the finishing line, the strip steel needs to undergo multiple rolling and straightening passes to eliminate internal residual stress and improve its straightness and surface quality.

[0003] In actual production, the mechanical properties and processing technology requirements of strip steel are relatively high. The tension distribution and motor selection must fully consider the physical characteristics and processing requirements of the strip steel. Simultaneously, parameters such as the thickness, width, and yield strength of the strip steel also affect the tension distribution and motor selection. Different strip steel materials have different physical parameters, and the required tension necessitates different motor torque requirements. When processing strip steel of different materials using the same finishing line, the same data cannot be directly applied due to the differences in material mechanical properties. Existing methods mainly rely on manual operation based on experience, resulting in low accuracy, poor timeliness, and limited production efficiency. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention provides a method and system for calculating tension distribution and selecting motors for strip steel finishing lines. This invention can calculate the tension distribution of the finishing line, provide production parameters, calculate the tension distribution of the entire strip steel finishing line, and then select motors based on tension requirements to ensure the optimal operating state of the finishing line.

[0005] This invention provides a method for calculating tension distribution and selecting a motor in a strip finishing line, including:

[0006] Based on the width, thickness, and yield strength limit of the strip steel to be processed, determine the tension requirement value of the strip steel at the entrance of the straightener in the strip steel finishing line;

[0007] Based on the tension requirement value of the strip steel to be processed at the entrance of the straightener, the tension requirement value of each tension roller in the strip steel finishing line is derived step by step forward and backward.

[0008] Based on the tension requirements at each tension roller, determine the basic parameters of the motor required at each tension roller, and select the appropriate motor based on these basic parameters.

[0009] Calculate the output torque of the selected motor at each tension roller under rated power, and calculate the actual output tension at each tension roller based on the output torque, reduction ratio and working diameter of the motor.

[0010] The actual output tension at each tension roller is compared with the required tension value to determine whether the selected motor meets the production requirements.

[0011] According to the method for calculating tension distribution and selecting motors in a strip finishing line provided by the present invention, the required tension value of the strip to be processed at the inlet of the straightener in the strip finishing line is determined by the following formula based on the width, thickness and yield strength limit of the strip to be processed:

[0012]

[0013]

[0014] in, Let be the tension requirement of the strip to be processed at the inlet of the straightening machine, b be the width of the strip to be processed, and h be the thickness of the strip to be processed. The yield strength limit of the strip steel to be processed. The tension coefficient, It is the tension loss coefficient. , and These are the fitting parameters.

[0015] According to the present invention, a method for calculating the tension distribution and selecting a motor for a strip finishing line is provided. The tension requirements at each tension roller in the strip finishing line are derived step-by-step from the tension requirement value of the strip to be processed at the inlet of the straightener using the following formula:

[0016]

[0017] in, The required tension values ​​at each tension roller are: The amplification factor is the tension requirement of the strip to be processed at the inlet of the straightening machine. , The coefficient of friction, Let n be the wrap angle of the strip to be processed on the tension roller, and n be the wrap angle utilization coefficient.

[0018] According to the method for calculating tension distribution and selecting motors in a strip finishing line provided by the present invention, the output torque of the selected motor at each tension roller under rated power is calculated using the following formula:

[0019]

[0020] in, The output torque of the motor is... This refers to the rated output power of the motor shaft. Where i is the rated speed of the motor, and i is the reduction ratio of the gearbox. Let D be the motor efficiency, D be the operating diameter, v be the linear velocity, and f be the actual frequency of the motor. e The rated frequency of the motor is given.

[0021] According to the present invention, a method for calculating tension distribution and selecting a motor for a strip finishing line is provided. The actual tension generated at each position is calculated using the following formula based on the motor's output torque, reduction ratio, and working diameter of the operating part; wherein, when the position is at the tension roller, the working diameter is the tension roller diameter; when the position is at the uncoiler or coiler, the working diameter is the operating diameter:

[0022]

[0023] in, It is the actual tension generated at each tension roller.

[0024] According to the present invention, a method for calculating tension distribution and selecting a motor for a strip finishing line is provided, which compares the actual output tension at each tension roller with the required tension value to determine whether the selected motor meets production requirements, including:

[0025] During the acceleration and deceleration of the motor, the dynamic compensation torque of the motor is determined;

[0026] Based on the dynamic compensation torque of the motor, determine the tension required for dynamic compensation of the motor;

[0027] The actual tension at each tension roller is determined based on the actual output tension at each tension roller and the tension required for dynamic compensation of the motor.

[0028] The actual tension at each tension roller is compared with the required tension value to determine whether the selected motor meets the production requirements.

[0029] According to the method for calculating tension distribution and selecting a motor for a strip finishing line provided by the present invention, when the motor is an uncoiler, the formula for the dynamic compensation torque of the motor is:

[0030]

[0031] The tension required for the dynamic compensation of the motor is:

[0032]

[0033] in, This refers to the dynamic compensation torque of the motor. The tension required for dynamic compensation of the uncoiler, where i is the reduction ratio of the gearbox, D is the operating diameter, and D0 is the inner diameter of the steel coil. Let g be the moment of inertia of the fixed flywheel on the drum shaft, calculated from the uncoiler drum, reducer, and motor; g be the acceleration due to gravity; and b be the width of the strip to be processed. The density of the strip steel to be processed is... Where h is the filling rate of the strip coiling, and h is the thickness of the strip to be processed. Let t be the linear velocity and t be the time.

[0034] This invention also provides a system for calculating tension distribution and selecting a motor for a strip finishing line, comprising:

[0035] The determination module is used to determine the tension requirement value of the strip at the entrance of the straightener in the strip finishing line based on the width, thickness and yield strength limit of the strip to be processed.

[0036] The derivation module is used to derive the tension requirement value at each tension roller in the strip finishing line step by step from the tension requirement value of the strip to be processed at the entrance of the straightener.

[0037] The selection module is used to determine the basic parameters of the motor required for each tension roller based on the tension requirement value at each tension roller, and to select the motor based on the basic parameters of the motor.

[0038] The calculation module is used to calculate the output torque of the selected motor at each tension roller under rated power, and to calculate the actual output tension at each tension roller based on the output torque, reduction ratio and working diameter of the motor.

[0039] The judgment module is used to compare the actual output tension at each tension roller with the required tension value to determine whether the selected motor meets the production requirements.

[0040] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the tension distribution calculation and motor selection method for strip finishing line as described above.

[0041] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method for calculating the tension distribution of the strip finishing line and selecting the motor as described above.

[0042] The present invention also provides a computer program product, including a computer program that, when executed by a processor, implements the tension distribution calculation and motor selection method for strip finishing line as described above.

[0043] The method and system for calculating tension distribution and selecting motors for strip finishing lines provided by this invention have the following beneficial effects:

[0044] First, this invention can calculate the tension distribution of the finishing line and provide production parameters.

[0045] The tension distribution of the entire cold-rolled strip finishing line was calculated, and then the motor was selected based on the tension requirements to ensure the optimal operating condition of the finishing line.

[0046] Secondly, the expected benefits and commercial value of the technical solution of this invention after transformation are as follows: This invention, through the calculation of tension distribution and motor selection of strip steel finishing lines, can help strip steel finishing lines to be put into production more quickly under different strip steel materials, thereby improving production efficiency.

[0047] The technical solution of this invention solves a long-standing but unresolved technical problem: the current method of selecting motors in strip steel finishing lines relies primarily on manual operation based on experience, resulting in low accuracy and poor timeliness. This invention determines the tension distribution of the finishing line based on the strip steel material, thereby selecting the appropriate motor. This solves the problems of unclear tension distribution and low motor selection efficiency in actual production of cold-rolled strip steel finishing lines.

[0048] Third, the technological advancements of the strip finishing line tension distribution calculation and motor selection method provided by this invention are mainly reflected in the following aspects:

[0049] 1. Improved Precision: By analyzing the limit values ​​of strip width, thickness, and yield strength in detail, and by drawing a tension distribution diagram of the entire production line based on the site layout, the tension distribution during the strip finishing process can be predicted and controlled more accurately. This improved precision helps optimize the processing quality of the strip and reduce the defect rate.

[0050] 2. Efficiency Improvement: By progressively deriving the tension values ​​at each tension roller around the straightening section and determining whether they meet the tension requirements at the unwinding and rewinding points, suitable motor parameters can be determined more quickly. This method can significantly improve work efficiency and shorten the production cycle.

[0051] 3. Enhanced Adaptability: Considering the variation in motor output tension at different speeds, this method ensures that the motor meets tension requirements at various unit speeds. This enhanced adaptability makes the strip finishing line more flexible and reliable, capable of adapting to diverse production environments and needs.

[0052] 4. Technological Innovation: This method, by introducing advanced calculation methods and analytical techniques, achieves precise calculation of tension distribution and optimization of motor selection in strip steel finishing lines. This technological innovation not only improves the quality and efficiency of strip steel processing but also provides new ideas and directions for technological advancements in related fields.

[0053] The technological advancements in the strip steel finishing line tension distribution calculation and motor selection method provided by this invention are mainly reflected in improved accuracy, increased efficiency, enhanced adaptability, and technological innovation. These advancements are of great significance for improving the production level and competitiveness of the strip steel processing industry. Attached Figure Description

[0054] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0055] Figure 1 This is a flowchart illustrating the method for calculating tension distribution and selecting motors in a strip finishing line provided by the present invention.

[0056] Figure 2 This is a schematic diagram of the tension distribution in the method for calculating the tension distribution of a strip finishing line and selecting a motor provided by the present invention;

[0057] Figure 3 This is a schematic diagram of the tension distribution calculation and motor selection system for strip finishing lines provided by the present invention. Detailed Implementation

[0058] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0059] The following is combined Figure 1 This invention describes a method for calculating tension distribution and selecting a motor in a strip steel finishing line, comprising:

[0060] Step 101: Determine the tension requirement of the strip at the entrance of the straightener in the strip finishing line based on the width, thickness and yield strength limit of the strip to be processed.

[0061] Step 102: Based on the tension requirement value of the strip steel to be processed at the entrance of the straightener, deduce the tension requirement value of each tension roller in the strip steel finishing line step by step.

[0062] Step 103: Determine the basic parameters of the motor required for each tension roller based on the tension requirement value at each tension roller, and select the motor type based on the basic parameters of the motor.

[0063] Step 104: Calculate the output torque of the selected motor at each tension roller under rated power. Based on the output torque, reduction ratio and working diameter of the motor, calculate the actual output tension at each tension roller.

[0064] Step 105: Compare the actual output tension at each tension roller with the required tension value to determine whether the selected motor meets the production requirements.

[0065] In the method for calculating the tension distribution and selecting the motor for the strip finishing line provided in this embodiment, the signal and data processing process can be described in detail as follows:

[0066] 1. Determine strip steel parameters

[0067] Data collection: First, collect parameters such as the width, thickness, and yield strength of the strip steel to be processed. These parameters are usually provided by production specifications or material test reports.

[0068] Limit value setting: Based on the physical and chemical properties of the strip, its limit values ​​are determined, which will serve as the basis for subsequent calculations and analyses.

[0069] 2. Draw the tension distribution diagram.

[0070] Layout analysis: Based on the on-site layout diagram of the strip steel finishing line, identify the key process sections and equipment locations.

[0071] Tension distribution diagram: Using computer-aided design software (such as AutoCAD), draw the tension distribution diagram for the entire production line based on the layout diagram and process flow. The diagram should clearly show the tension direction and magnitude of each process section.

[0072] 3. Calculate the inlet tension of the straightening machine

[0073] Preliminary calculations: Using mechanical principles and materials science knowledge, the required tension of the strip at the entrance of the straightener is calculated to ensure that the strip can achieve the expected straightness during the straightening process.

[0074] Software assistance: Specialized materials processing software is required to assist in the calculations and ensure their accuracy and reliability.

[0075] 4. Derive the tension values ​​at each tension roller.

[0076] Tension requirement analysis: Based on the tension requirement of the straightening process section, which is usually the maximum value of the tension requirement.

[0077] Step-by-step derivation: Starting from the straightening section, the tension values ​​at each tension roll are gradually derived forward (towards the uncoiling point) and backward (towards the rewinding point). This step involves complex mechanical calculations, requiring consideration of factors such as the elastic modulus of the strip, the coefficient of friction, and the distance between the rolls.

[0078] 5. Calculate motor parameters

[0079] Motor parameter derivation: Based on the derived tension value, calculate the required basic parameters of the motor, such as power, torque, and speed. A pre-established correlation between the tension value and the range of basic motor parameters can be used to find the corresponding range of basic parameters for the derived tension value.

[0080] Motor selection: Based on the calculation results and the available motor specifications on the market, select a motor to ensure that the selected motor can meet the tension requirements of all process sections.

[0081] 6. Calculate the actual tension.

[0082] Motor output torque calculation: Calculate the output torque of the motor under rated conditions.

[0083] Actual tension calculation: Based on parameters such as the motor's output torque, reduction ratio, and tension roller diameter, calculate the actual tension generated at each roller. If the actual tension generated at each roller is greater than or equal to the required tension value, the requirement is met; otherwise, the requirement is not met.

[0084] Speed ​​analysis: In order to ensure that the motor can meet the tension requirements at different speeds, it is necessary to further analyze the output characteristics of the motor at different speeds.

[0085] Throughout the signal and data processing, specialized computing software and simulation tools, such as MATLAB and ANSYS, are required to ensure the accuracy and practicality of the calculations. Furthermore, in actual operation, the specific working conditions of the strip steel finishing line, such as environmental factors like temperature and humidity, as well as the actual operating status of the equipment, must be considered to correct and optimize the calculation results.

[0086] This embodiment uses a finishing line including an uncoiler, tension roller group, tension leveler, and rewinder. The inlet tension of the tension leveler is the tension requirement of the entire line. Based on the inlet tension requirement of the tension leveler, the tension requirement of each roller is derived forward and backward. According to the site layout diagram, the tension distribution diagram of the entire line is drawn. The motor model is determined from the tension requirement. Finally, the actual tension is calculated from the motor parameters, thereby determining whether the motor selection meets the production requirements and realizing automatic and accurate motor selection.

[0087] Based on the above embodiments, this embodiment determines the tension requirement of the strip at the entrance of the straightener in the strip finishing line using the following formula, based on the width, thickness, and yield strength limit of the strip to be processed:

[0088]

[0089]

[0090] in, Here, b represents the tension requirement of the strip to be processed at the entrance of the straightening machine, b represents the width of the strip to be processed in mm, and h represents the thickness of the strip to be processed in mm. The yield strength limit of the strip steel to be processed. The tension coefficient, It is the tension loss coefficient. , and These are the fitting parameters.

[0091] Empirical formulas are as shown in formula (2), for example , and .

[0092] Based on the above embodiments, this embodiment uses the following formula to derive the tension requirements at each tension roller in the strip finishing line step by step from the tension requirement value of the strip to be processed at the entrance of the straightener:

[0093]

[0094] in, The required tension values ​​at each tension roller are: The amplification factor is the tension requirement of the strip to be processed at the inlet of the straightening machine. , , The coefficient of friction, The wrap angle of the strip to be processed on the tension roll. , where n is the corner utilization coefficient, which is generally taken as 0.9.

[0095] Based on the above embodiments, the formula for the rated power of the motor in this embodiment is:

[0096]

[0097] in, Rated output power of the motor shaft, in kW; The rated torque of the motor, in units ; The rated speed of the motor is expressed in r / min. For motor efficiency, it is generally taken as =0.95.

[0098] Motor speed formula:

[0099]

[0100] in, The actual speed of the motor, in r / min; Linear velocity, in m / min;

[0101] D is the effective diameter, in meters (m).

[0102] Operating frequency formula:

[0103]

[0104] Where f is the actual frequency of the motor, in Hz; is the rated frequency of the motor, in Hz; i is the reduction ratio of the gearbox.

[0105] The load torque is:

[0106]

[0107] in, The load torque of the motor, in units T represents the tension of the unwinding and rewinding machine, in units of 1 / 2.

[0108] The output torque is:

[0109]

[0110] in, The output torque of the electric motor, in units of .

[0111] Based on formulas (7) and (8), the output torque of the motor at rated power can be derived:

[0112]

[0113] in, The output torque of the motor is... This refers to the rated output power of the motor shaft. Where i is the rated speed of the motor, and i is the reduction ratio of the gearbox. Let D be the motor efficiency, D be the operating diameter, v be the linear velocity, and f be the actual frequency of the motor. e The rated frequency of the motor is given.

[0114] Based on the above embodiments, this embodiment calculates the actual tension generated at each tension roller using the following formula, based on the motor's output torque, reduction ratio, and operating diameter:

[0115]

[0116] in, It is the actual tension generated at each tension roller.

[0117] Based on the above embodiments, this embodiment compares the actual output tension at each tension roller with the required tension value to determine whether the selected motor meets production requirements, including:

[0118] During the acceleration and deceleration of the motor, the dynamic compensation torque of the motor is determined;

[0119] Based on the dynamic compensation torque of the motor, determine the tension required for dynamic compensation of the motor;

[0120] The actual tension at each tension roller is determined based on the actual output tension at each tension roller and the tension required for dynamic compensation of the motor.

[0121] The actual tension at each tension roller is compared with the required tension value to determine whether the selected motor meets the production requirements.

[0122] Stable production on the production line requires constant tension, which necessitates precise tension control. To achieve precise tension control, dynamic torque compensation is necessary. During acceleration and deceleration, the motor needs to provide a portion of torque M to overcome mechanical inertia, which is called dynamic compensation torque.

[0123] Based on the above embodiments, this embodiment takes the uncoiler as an example. The maximum transmission torque occurs when the unit accelerates, and is calculated using the following formula.

[0124]

[0125] In the formula, M 开max M is the maximum transmission torque of the motor; 开稳 The transmission torque required to maintain the tension of the unit, Where T is the unit tension, in N; D is the roll diameter, in m; M 开动 The torque required for speed adjustment of the unwinding / rewinding machine:

[0126]

[0127] in, Angular acceleration, unit: rad / s 2 ; The sum of the rotational inertia of the uncoiler drum, reducer, and motor folded onto the drum, in kg·m. 2 ; The moment of inertia of the steel coil on the uncoiler drum, in kg·m. 2 .

[0128] When the uncoiler changes speed, it is subjected to the strip tension (i.e., the unit tension) T and the tension T1 generated by the uncoiler drive motor. Analyzing its dynamic characteristics, we obtain the following formula:

[0129]

[0130] According to formulas (11), (12), and (13), we can obtain:

[0131]

[0132] The rated torque of the unwinding machine's drive motor must satisfy the following formula:

[0133]

[0134] in: This refers to the speed ratio of the uncoiler transmission. This is the motor overload factor.

[0135] Taking the uncoiler as an example, according to formula (11), the driving torque has two parts. One part is caused by the change in the speed of the drum. At this instant, it is assumed that GD2 (that is, the sum of GD2 of the uncoiler drum, reducer, and motor combined onto the drum) is a constant. This indicates that the other part is caused by the change in GD2; this instantaneous assumption is n. m As a constant, with Indicate, then It can also be expressed as:

[0136]

[0137] Let the flywheel inertia GD2 represent the rotational inertia J, and the angular velocity... and The relationship between them is as follows:

[0138]

[0139] The relationship between J and GD2 is:

[0140]

[0141] Where g is the acceleration due to gravity, taken as 9.8 N / kg;

[0142] Then M 开动 It can also be expressed as:

[0143]

[0144] The flywheel inertia of an uncoiler is generally divided into two types: one is GD02, which is a constant value caused by the characteristics of the motor, gearbox, and drum itself; the other, GD12, belongs to the flywheel inertia of the steel coil. Since the steel coil is in motion, it is constantly increasing or decreasing, so this flywheel inertia is a variable, and its expression is:

[0145]

[0146] in, This refers to the density of the strip steel, in kg / m³. 3 ; The filling rate of the strip coil; The width of the strip is in meters (m). The inner diameter of the steel coil is in meters (m).

[0147] The total flywheel inertia on the drum shaft is:

[0148]

[0149] Therefore, the rate of change of the flywheel's moment of inertia is:

[0150]

[0151] The rate of change of rotational speed can be obtained as follows:

[0152]

[0153] According to formula (17), the rate of change of rotational speed can be derived as follows:

[0154]

[0155] For every revolution of the uncoiler drum, the strip diameter decreases by half the strip thickness by 2h. When the uncoiling time is t, the angle through which the drum rotates is... Then we have:

[0156]

[0157] Differentiating both sides with respect to t, we obtain the following relationship between the roll diameter and time:

[0158]

[0159] According to formulas (20), (22), and (27), we can obtain:

[0160]

[0161] As can be seen from formula (25), once the process parameters such as the density of the strip, the filling rate of the coil, the width, and the inner diameter of the coil are determined, the magnitude of the dynamic torque is related to the uncertain parameter linear velocity. Related to the roll diameter D, the linear velocity v is constant, so the rate of change of velocity is... If the value is 0, the dynamic torque will only change with the change of the roll diameter D. According to formula (27), the tension required for dynamic compensation is:

[0162] The tension required for the dynamic compensation of the motor is:

[0163]

[0164] in, The tension required for dynamic compensation of the uncoiler is expressed in N; i is the reduction ratio of the gearbox; D is the operating diameter; and D0 is the inner diameter of the steel coil. Let g be the moment of inertia of the fixed flywheel on the drum shaft, calculated from the uncoiler drum, reducer, and motor; g be the acceleration due to gravity; and b be the width of the strip to be processed. The density of the strip steel to be processed is... Where h is the filling rate of the strip coiling, and h is the thickness of the strip to be processed. Let t be the linear velocity and t be the time.

[0165] Similarly, the formula for calculating the maximum transmission torque of the winding machine is:

[0166]

[0167] Where T2 is the tension generated by the winding machine drive motor, in kN;

[0168] The rated torque of the winding machine drive motor must meet the following formula:

[0169]

[0170] Among them, i 收 This refers to the transmission speed ratio of the winding machine;

[0171] The derivation process for the dynamic compensation tension of the winding machine is the same as that of the uncoiler; therefore, the formula for calculating the tension required for dynamic compensation is consistent. The tension required for dynamic compensation is:

[0172]

[0173] Among them, T 收动 The tension required for dynamic compensation of the winding machine, in N.

[0174] Therefore, when the speed increases, the output tension T of the unwinding machine is in the same direction as the tension T required for dynamic compensation, and the direction is opposite when the speed decreases. If the direction of the tension torque when the unwinding machine accelerates is taken as positive, then the formula for the actual tension T of the unwinding machine is:

[0175]

[0176] Experiment 1: Tension Distribution Calculation and Motor Selection for Cold-Rolled Strip Finishing Line

[0177] On a strip finishing line at a cold-rolled steel mill, tension control is required for the cold-rolled strip to ensure its straightness and surface quality. The specific implementation steps are as follows:

[0178] 1. Determine the strip steel parameters:

[0179] Plate width: 1250mm; Plate thickness: 0.8mm; Yield strength: 280MPa.

[0180] 2. Drawing the tension distribution diagram:

[0181] Based on the layout diagram of the finishing line, draw a tension distribution diagram from unwinding to rewinding, including each process section such as the straightener, coating machine, and shearing machine.

[0182] 3. Calculation of inlet tension of the straightening machine:

[0183] Assuming the inlet tension of the straightening machine is 5000N, calculate the tension requirements for other sections based on this.

[0184] 4. Calculation of tension requirements for the straightening process section:

[0185] The straightening process requires maximum tension, let's say 8000N, to meet the straightening requirements of the strip.

[0186] 5. Motor parameter calculation:

[0187] Based on the maximum tension requirement of 8000N, select motor parameters to ensure that the motor can meet the maximum tension requirement at different speeds.

[0188] 6. Actual tension calculation and motor selection:

[0189] The selected motor has an output torque of 200 Nm at its rated power, a reduction ratio of 1:5, and a tension roller diameter of 0.5 m. The calculated actual tension is 8000 N, which meets the requirements.

[0190] Through the above steps, the precise calculation of tension in the cold-rolled strip finishing line and the rational selection of motors were successfully achieved, ensuring the stability of the production process and the quality of the strip products.

[0191] Experiment 2: Tension Distribution Calculation and Motor Selection for Hot-Rolled Strip Finishing Line

[0192] On the strip finishing line of a hot-rolled steel mill, precise tension control of the hot-rolled strip is required to optimize the heat treatment effect and mechanical properties of the strip. The specific implementation steps are as follows:

[0193] 1. Determine the strip steel parameters:

[0194] Plate width: 1500mm; Plate thickness: 2.0mm; Yield strength: 350MPa.

[0195] 2. Drawing the tension distribution diagram:

[0196] Based on the actual layout of the finishing line, a tension distribution diagram is drawn, covering key process sections such as uncoiling, straightening, cooling, and shearing.

[0197] 3. Calculation of inlet tension of the straightening machine:

[0198] The inlet tension of the straightening machine is set to 6000N as the starting point for tension calculation.

[0199] 4. Calculation of tension requirements for the straightening process section:

[0200] The maximum tension requirement for the straightening process section is set at 10,000 N to ensure the straightness of the strip during heat treatment.

[0201] 5. Motor parameter calculation:

[0202] Based on the tension requirement of 10000N, select appropriate motor parameters to ensure that the motor can provide sufficient tension across the entire speed range.

[0203] 6. Actual tension calculation and motor selection:

[0204] The selected motor provides a maximum torque of 250 Nm under rated power conditions, with a reduction ratio of 1:4 and a tension roller diameter of 0.6 m. The calculated actual tension is 10,000 N, which meets the production requirements.

[0205] Through this series of steps, precise calculations of the tension distribution and correct selection of motors were achieved for the hot-rolled strip finishing line, ensuring the heat treatment quality of the strip and the efficient operation of the production line.

[0206] The strip steel parameters are shown in Table 1. Based on processing experience, β is taken as 1.

[0207] Table 1 Strip Steel Parameters

[0208]

[0209] The tension coefficient k = 0.13, and the theoretical tension at the inlet of the straightening section T_straighten = 118.3 kN. The calculated inlet tension of the straightening machine is only a theoretical tension and is for reference only. According to actual processing requirements and experience, the actual inlet tension requirement of the straightening machine is 140 kN. Figure 2 To create a tension distribution diagram for the entire production line based on the site layout diagram, the horizontal lines at the bottom of the diagram only represent the relative tension of each segment. Specifically, T1 to T5 represent the tension values ​​at tension roller groups #1 to #5, and T... 开 and T 卷 These are the tension values ​​at the uncoiler and the winding machine, respectively, T. 开 +T1 represents the section tension between the uncoiler and tension roll group #1, T 光整 T represents the tension value at the optical assembly. 纠T represents the tension value at the correction device. 光整 +T 纠 The tension in the section between the optical system and the correction device.

[0210] Based on the tension distribution and formula, suitable motors are selected. The motors used in the finishing line are frequency converter motors. The motor model at the uncoiler is YO2-100L1-4. The motor model at roll 1#-1 is YO2-100L2-4, and the motor model at roll 1#-2 is YP2-132S-4. The motor model at roll 2#-1 is YP2-132M-4, and the motor model at roll 2#-2 is YP2-160L-4. The motor model at roll 3#-1 is YP2-132S-4, and the motor model at roll 3#-2 is YP2-160M-4. The motor model at roll 4#-1 is YO2-100L2-4, and the motor model at roll 4#-2 is YO2-100L2-4. The motor model at roll 5#-1 is YO2-100L1-4. The motor model at roller #5-2 is YO2-100L1-4. The motor model at the winding machine is YO2-100L2-4.

[0211] The tension values ​​at various points were calculated based on the specific motor parameters, as shown in Table 2.

[0212] Table 2

[0213]

[0214] The tension distribution calculation and motor selection system for strip finishing lines provided by this invention will be described below. The tension distribution calculation and motor selection system for strip finishing lines described below can be referred to in correspondence with the tension distribution calculation and motor selection method for strip finishing lines described above.

[0215] like Figure 3 As shown, the system includes a determination module 301, a derivation module 302, a selection module 303, a calculation module 304, and a judgment module 305, wherein:

[0216] The determination module 301 is used to determine the tension requirement value of the strip at the entrance of the straightener in the strip finishing line based on the width, thickness and yield strength limit of the strip to be processed.

[0217] The derivation module 302 is used to derive the tension requirement value at each tension roller in the strip finishing line step by step from the tension requirement value of the strip to be processed at the entrance of the straightener.

[0218] The selection module 303 is used to determine the basic parameters of the motor required at each tension roller based on the tension requirement value at each tension roller, and to select the motor based on the basic parameters of the motor.

[0219] The calculation module 304 is used to calculate the output torque of the selected motor at each tension roller under rated power, and to calculate the actual output tension at each tension roller based on the output torque, reduction ratio and working diameter of the motor.

[0220] The judgment module 305 is used to compare the actual output tension at each tension roller with the required tension value to determine whether the selected motor meets the production requirements.

[0221] This embodiment uses a finishing line including an uncoiler, tension roller group, tension leveler, and rewinder. The inlet tension of the tension leveler is the tension requirement of the entire line. Based on the inlet tension requirement of the tension leveler, the tension requirement of each roller is derived forward and backward. According to the site layout diagram, the tension distribution diagram of the entire line is drawn. The motor model is determined from the tension requirement. Finally, the actual tension is calculated from the motor parameters, thereby determining whether the motor selection meets the production requirements and realizing automatic and accurate motor selection.

[0222] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for calculating tension distribution and selecting a motor in a strip steel finishing line, characterized in that, include: Based on the width, thickness, and yield strength limit of the strip steel to be processed, determine the tension requirement value of the strip steel at the entrance of the straightener in the strip steel finishing line; Based on the tension requirement value of the strip steel to be processed at the entrance of the straightener, the tension requirement value of each tension roller in the strip steel finishing line is derived step by step forward and backward. Based on the tension requirements at each tension roller, determine the basic parameters of the motor required at each tension roller, and select the appropriate motor based on these basic parameters. Calculate the output torque of the selected motor at each tension roller under rated power, and calculate the actual output tension at each tension roller based on the output torque, reduction ratio and working diameter of the motor. The actual output tension at each tension roller is compared with the required tension value to determine whether the selected motor meets the production requirements.

2. The method for calculating tension distribution and selecting motors for strip finishing lines according to claim 1, characterized in that, The tension requirement of the strip at the entrance of the straightener in the strip finishing line is determined using the following formula, based on the width, thickness, and yield strength limit of the strip to be processed: ； ； in, Let be the tension requirement of the strip to be processed at the inlet of the straightening machine, b be the width of the strip to be processed, and h be the thickness of the strip to be processed. The yield strength limit of the strip steel to be processed. The tension coefficient, It is the tension loss coefficient. , and These are the fitting parameters.

3. The method for calculating tension distribution and selecting motors for strip finishing lines according to claim 1, characterized in that, The tension requirements at each tension roller in the strip finishing line are derived step-by-step from the tension requirement at the entry point of the straightener using the following formula: ； in, The required tension values ​​at each tension roller are: The amplification factor is the tension requirement of the strip to be processed at the inlet of the straightening machine. , The coefficient of friction, Let n be the wrap angle of the strip to be processed on the tension roller, and n be the wrap angle utilization coefficient.

4. The method for calculating tension distribution and selecting motor for a strip finishing line according to claim 1, characterized in that, The output torque of the selected motor at rated power at each tension roller is calculated using the following formula: ； in, The output torque of the motor is... This refers to the rated output power of the motor shaft. Where i is the rated speed of the motor, and i is the reduction ratio of the gearbox. Let D be the motor efficiency, D be the operating diameter, v be the linear velocity, and f be the actual frequency of the motor. e The rated frequency of the motor is given.

5. The method for calculating tension distribution and selecting motor for a strip finishing line according to claim 4, characterized in that, The actual tension generated at each tension roller is calculated using the following formula based on the motor's output torque, reduction ratio, and operating diameter: ； in, It is the actual tension generated at each tension roller.

6. The method for calculating tension distribution and selecting motor for a strip finishing line according to any one of claims 1-5, characterized in that, The actual output tension at each tension roller is compared with the required tension value to determine whether the selected motor meets production requirements, including: During the acceleration and deceleration of the motor, the dynamic compensation torque of the motor is determined; Based on the dynamic compensation torque of the motor, determine the tension required for dynamic compensation of the motor; The actual tension at each tension roller is determined based on the actual output tension at each tension roller and the tension required for dynamic compensation of the motor. The actual tension at each tension roller is compared with the required tension value to determine whether the selected motor meets the production requirements.

7. The method for calculating tension distribution and selecting motor for a strip finishing line according to claim 6, characterized in that, When the motor is an uncoiler, the formula for the dynamic compensation torque of the motor is: ； The tension required for the dynamic compensation of the motor is: ； in, This refers to the dynamic compensation torque of the motor. The tension required for dynamic compensation of the uncoiler, where i is the reduction ratio of the gearbox, D is the operating diameter, and D0 is the inner diameter of the steel coil. Let g be the moment of inertia of the fixed flywheel on the drum shaft, calculated from the uncoiler drum, reducer, and motor; g be the acceleration due to gravity; and b be the width of the strip to be processed. The density of the strip steel to be processed is... Where h is the filling rate of the strip coiling, and h is the thickness of the strip to be processed. Let t be the linear velocity and t be the time.

8. A system for calculating tension distribution and selecting motors in a strip steel finishing line, characterized in that, include: The determination module is used to determine the tension requirement value of the strip at the entrance of the straightener in the strip finishing line based on the width, thickness and yield strength limit of the strip to be processed. The derivation module is used to derive the tension requirement value at each tension roller in the strip finishing line step by step from the tension requirement value of the strip to be processed at the entrance of the straightener. The selection module is used to determine the basic parameters of the motor required for each tension roller based on the tension requirement value at each tension roller, and to select the motor based on the basic parameters of the motor. The calculation module is used to calculate the output torque of the selected motor at each tension roller under rated power, and to calculate the actual output tension at each tension roller based on the output torque, reduction ratio and working diameter of the motor. The judgment module is used to compare the actual output tension at each tension roller with the required tension value to determine whether the selected motor meets the production requirements.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the method for calculating the tension distribution of the strip finishing line and selecting the motor as described in any one of claims 1 to 7.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the method for calculating the tension distribution and selecting the motor for the strip finishing line as described in any one of claims 1 to 7.

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