An automatic pressure adjustment method, system and medium for pressure rollers

Abstract

This invention discloses an automatic pressure adjustment method, system, and medium for pressure rollers, comprising: acquiring the height data of strip steel waviness using a rangefinder; correcting a preset initial pressure value based on the height data and the corresponding strip steel thickness; and controlling the pressure roller equipment to apply pressure to the strip steel according to the corrected initial pressure value. Based on different strip steel thicknesses, the required pressure parameters for the current strip steel specification are analyzed using historical and height data; the size of the strip steel edge waviness is calculated using a rangefinder; and a compensation value is applied to the pressure adjustment based on the waviness size, achieving closed-loop control of pressure and waviness. This enables automated production to prevent strip steel slippage and eliminate edge waviness during strip steel production.

Description

Technical Field

[0001] This invention relates to the field of cold rolling mill roll process control technology, and in particular to an automatic roll pressure adjustment method, system and medium. Background Technology

[0002] In the strip steel production process, tension rollers and pressure rollers are crucial components of the rolling equipment. The tension roller converts the torque applied by the drive unit into strip tension through friction between the roller surface and the strip, preventing strip deviation and ensuring stable production. The tension roller must maintain precision and operate smoothly to minimize strip waste and quality issues. The pressure roller compacts and flattens the extruded molten plastic stream as it passes through the forming die and pressure roller, ensuring a tight seal between the strip and the forming die and transmitting the die's pressure to the strip. The pressure roller must also maintain precision and operate smoothly to reduce strip waste and quality problems. During production, the tension roller and pressure roller work together to ensure the straightness and flatness of the strip.

[0003] After cold rolling of strip steel, at the production line entrance during the shearing and tail-off process, the strip steel is held down by the No. 1 tension roller and the pressure roller, awaiting welding. However, when producing thin strip steel, the pressure of the No. 1 tension roller and the pressure roller is too high, causing large waviness on the edges of the strip steel, affecting product quality. When producing thick strip steel, due to the high tension in the cleaning section, the pressure of the No. 1 tension roller and the pressure roller is too low, failing to effectively compress the strip steel, causing the strip tail to slip backward. In severe cases, the strip tail may be pulled out of the No. 1 tension roller area, causing tension loss in the cleaning section and leading to furnace shutdown. Therefore, an automatic pressure adjustment method, system, and medium for the pressure roller are needed. Summary of the Invention

[0004] This invention provides an automatic pressure adjustment method, system, and medium for pressure rollers, which at least partially solves the technical problem in the prior art where pressure rollers cannot effectively press the strip steel, leading to furnace shutdowns. It achieves automatic adjustment of pressure roller pressure based on different strip steel thicknesses, thereby pressing the strip steel and preventing the strip tail from slipping backward.

[0005] Firstly, to solve the above-mentioned technical problems, embodiments of the present invention provide the following technical solutions:

[0006] An automatic pressure adjustment method for pressure rollers includes:

[0007] Use a rangefinder to obtain the height data of the steel corrugated strip;

[0008] Based on the above height data and the corresponding strip thickness, the preset initial pressure value is corrected;

[0009] Based on the corrected initial pressure value, the pressure roller device is controlled to apply pressure to the strip steel.

[0010] Optionally, the above-mentioned step of correcting the preset initial pressure value further includes:

[0011] The target settings for the above strip wave pattern detection are preset based on historical data;

[0012] Based on the above target setting value, the corresponding measured value of the rangefinder, and the above initial pressure value, the correction compensation value is calculated.

[0013] The final pressure value is obtained by summing the above-mentioned correction compensation value and the above-mentioned initial pressure value.

[0014] Optionally, the step of calculating the corrected compensation value as described above further includes:

[0015] Using the above target set value and the above initial pressure value as quantitative values, the above measured data of the rangefinder as independent variables, and the above correction compensation value as dependent variables, the algebraic relationship for calculating the above correction compensation value under different strip thicknesses is obtained by fitting based on historical data.

[0016] Substitute the target setpoint, initial pressure value, and measured value from the rangefinder into the algebraic formula to obtain the required correction compensation value.

[0017] Optionally, after substituting the above algebraic relationship to obtain the required correction compensation value, the above method includes:

[0018] The average of the above-mentioned correction compensation values ​​over multiple periods is taken as the final correction compensation value.

[0019] Optionally, the step of calculating the corrected compensation value as described above further includes:

[0020] A limit range is set for the above-mentioned correction compensation value. For the above-mentioned correction compensation value that exceeds the above-mentioned preset range, the endpoint value that is closest to the correction compensation value within the above-mentioned limit range is taken.

[0021] Optionally, the above steps of obtaining the height data of the steel wave pattern using a rangefinder further include:

[0022] The aforementioned rangefinder acquires the actual value through successive scanning and uses the average value of multiple cycles as the height data used in the calculation.

[0023] Optionally, before correcting the preset initial pressure value, the method further includes:

[0024] Based on historical data and / or experimental data, different initial pressures are preset according to the different thicknesses of the strip steel.

[0025] Optionally, the pressure roller device described above adjusts the pressure of the pressure roller on the strip steel through a hydraulic proportional regulating valve.

[0026] Secondly, an automatic pressure adjustment system for pressure rollers is provided, comprising:

[0027] The height data acquisition module is used to acquire the height data of the steel wave pattern using a rangefinder;

[0028] The correction calculation module corrects the preset initial pressure value based on the above height data and the corresponding strip thickness.

[0029] The execution module is used to control the pressure roller device to apply pressure to the strip steel according to the corrected initial pressure value.

[0030] Fourthly, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, performs the steps corresponding to the method described in the first aspect.

[0031] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0032] Based on different strip thicknesses, historical and height data are used to analyze the required pressure parameters for the current strip specifications. A laser rangefinder is used to calculate the size of the strip edge waviness. Based on the waviness size, a compensation value is applied to the pressure adjustment, achieving closed-loop control of pressure and waviness. This enables automated production to prevent strip slippage and eliminate edge waviness during strip production. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 A flowchart of an automatic pressure adjustment method for a pressure roller provided by the present invention;

[0035] Figure 2 A flowchart of an automatic pressure adjustment system for pressure rollers provided by the present invention. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0038] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0039] It should be understood that the embodiments of the present invention and the specific features in the embodiments are detailed descriptions of the technical solutions of this application, rather than limitations on the technical solutions of this application. Unless otherwise specified, the embodiments of the present application and the technical features in the embodiments can be combined with each other.

[0040] Furthermore, the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0041] The technical solution of this invention is to solve the above-mentioned technical problems, and the overall idea is as follows:

[0042] First, based on different strip thicknesses, the required pressure parameters for the current strip specification are determined using historical and experimental data. Then, the waviness at the edge of the strip is detected to obtain the height data of the waviness. Based on this height data, strip thickness, and pressure parameters, a compensation value for pressure adjustment is fitted, thereby achieving automated control of pressure and waviness.

[0043] In this embodiment of the invention, the following are provided: Figure 1 The method for automatically adjusting the pressure of a pressure roller shown includes steps S101 to S103:

[0044] Step S101: Use a rangefinder to obtain the height data of the steel wave pattern;

[0045] It should be noted that the primary function of the rangefinder is to measure the height of the strip's waviness. Since the strip is in motion, to avoid wear and tear caused by direct contact between the rangefinder and the strip, various types of rangefinders can be used, such as laser rangefinders, ultrasonic rangefinders, infrared rangefinders, microwave rangefinders, acoustic rangefinders, and infrasonic rangefinders. This embodiment preferably uses a laser rangefinder, whose laser beam illuminates the edge of the strip to detect its waviness.

[0046] Step S102: Correct the preset initial pressure value based on the height data and the corresponding strip thickness.

[0047] It should be noted that there is a direct relationship between the wave height at the edge of the strip with different thicknesses and the pressure value to be applied. That is, the greater the difference between the wave height value and the target set value (i.e., the height value that meets the production requirements at the edge of the strip), and the greater the thickness of the strip, the greater the required pressure. For this reason, two methods can be adopted. The first method is to establish a pressure value comparison table corresponding to different height data under different strip thicknesses based on historical data and / or experimental data. Then, during the production process, select the pressure value according to the comparison table to control the operation of the pressure roller equipment. This method requires a large number of experiments based on different thicknesses and different heights, and at the same time, it is impossible to effectively operate on the data that has not been experimented. In this embodiment, the second method is adopted, which uses the height data as the independent variable and the correction compensation value of the pressure as the dependent variable for fitting, so as to obtain a function for calculating the correction compensation value, thereby achieving the correction of the data not mentioned in the historical data and experimental data and improving the convenience.

[0048] In addition, before correcting the preset initial pressure value, it further includes:

[0049] Based on historical data or / and experimental data, preset different initial pressures according to different strip thicknesses.

[0050] It should be noted that for different strips, the pressure to be applied after the wave appears is also different. Since the strip thickness type is constant, it is only necessary to monitor the strip with the corresponding thickness value H and the more appropriate pressure value during the production process, thereby reducing the adjustment range of the pressure roller equipment. For example:

[0051] 0.3 ≤ H ≤ 0.8 mm, when the strip thickness is within this range, automatically issue the pressure value Y1;

[0052] 0.8 < H ≤ 1.2 mm, when the strip thickness is within this range, automatically issue the pressure value Y2;

[0053] 1.2 < H ≤ 1.5 mm, when the strip thickness is within this range, automatically issue the pressure value Y3;

[0054] 1.5 < H ≤ 2.0 mm, when the strip thickness is within this range, automatically issue the pressure value Y4;

[0055] 2.0 < H ≤ 2.5 mm, when the strip thickness is within this range, automatically issue the pressure value Y5.

[0056] Step S103: Control the pressure roller equipment to apply pressure to the strip according to the corrected initial pressure value. That is, sum the initial pressure value and the correction compensation value to obtain the pressure value used to control the pressure roller equipment to apply pressure to the strip.

[0057] Furthermore, the step of correcting the preset initial pressure value also includes:

[0058] Preset target values ​​for strip wave pattern detection based on historical data;

[0059] It should be noted that it is against the laws of physics to maintain the absolute level (i.e., flatness of 0) of strip steel. Therefore, the wave pattern needs to be pressed to meet the flatness required for strip steel production. This means that, based on real-time monitoring of data during the production process, data that meets the production requirements is selected as the target setting value for wave height detection.

[0060] The correction compensation value is calculated based on the target set value, the corresponding measured value of the rangefinder, and the initial pressure value.

[0061] It should be noted that after setting the target setpoint, the calculation is mainly based on the difference between the target setpoint and the actual measurement value from the rangefinder. A positive difference indicates that the wave height is lower than the target setpoint, while a negative difference indicates that the wave height is higher than the target setpoint. The compensation value required for the corresponding initial pressure value is then calculated based on the difference between the actual measurement value and the target setpoint.

[0062] In detail, this embodiment uses the target set value and the initial pressure value as quantitative values, the actual measured data of the rangefinder as independent variables, and the correction compensation value as dependent variables. Based on historical data, the algebraic relationship for calculating the correction compensation value under different strip thicknesses is obtained.

[0063] Substitute the target setpoint, initial pressure value, and measured value from the rangefinder into the algebraic formula to obtain the required correction compensation value.

[0064] The algebraic relation is as follows:

[0065]

[0066] Where D is the correction compensation value, B is the target set value, C is the measured value of the rangefinder, and Y is the initial pressure value.

[0067] Finally, the corrected compensation value and the initial pressure value are summed to obtain the final pressure value P. That is:

[0068] P = Y + D

[0069]

[0070] Furthermore, after substituting the algebraic relation to obtain the required correction compensation value, the method includes:

[0071] The average value of the correction compensation over multiple periods is taken as the final correction compensation value.

[0072] It should be noted that during the production process of the strip steel, especially during transportation, vibrations occur, causing the strip steel to shift vertically, which leads to errors in the rangefinder's testing. Therefore, this embodiment uses an average of the correction compensation value over multiple cycles for further correction, aiming to prevent the laser rangefinder's detection value from being too high or too low due to strip steel vibrations. Taking 5 cycles as an example, the calculation formula is as follows:

[0073]

[0074] Where E is the average value, and D1, D2, D3, D4, and D5 are the correction compensation values ​​for the five periods, respectively.

[0075] Accordingly, the final pressure value P is: P = Y + E.

[0076] Furthermore, the step of calculating the corrected compensation value also includes:

[0077] Set a limit range for the correction compensation value. If the correction compensation value exceeds the preset range, take the endpoint value that is closest to the correction compensation value within the limit range.

[0078] It should be noted that in actual strip steel production, there may be instances where the correction compensation value increases abnormally. Therefore, a limit range is set for the correction compensation value. For example, the limit range is set to ±5. When the correction compensation value exceeds this range, it is calculated using +5 or -5 (±5 is the endpoint value). If it does not exceed this range, it is calculated according to the original correction compensation value.

[0079] Furthermore, the step of obtaining the height data of the steel wave pattern using a rangefinder also includes:

[0080] The rangefinder acquires the actual value by scanning sequentially and takes the average value of multiple cycles as the height data used in the calculation.

[0081] It should be noted that due to the complex operating conditions in strip steel production, external factors may cause errors in the height data obtained from a single cycle of measurement. Therefore, the actual value of the rangefinder is obtained by scanning successively and taking the average of the height data from 5 cycles for calculation. This achieves higher data accuracy.

[0082] Furthermore, the pressure roller equipment adjusts the pressure of the pressure roller on the strip steel through a hydraulic proportional regulating valve.

[0083] It should be noted that a hydraulic proportional control valve is a pressure control device that automatically adjusts and stabilizes pressure using the pressure difference of a liquid medium, and also has flow control functions. By utilizing the hydraulic proportional control valve, the flow rate can be automatically adjusted according to changes in system load, ensuring the system remains in a stable operating state and improving system stability and safety. Furthermore, because the hydraulic proportional control valve employs proportional valve technology and electro-hydraulic proportional technology, its control precision is extremely high, reaching millisecond or even sub-millisecond levels, thus guaranteeing the accuracy of the strip steel production pressure. In addition, it also features fast response speed, good stability, and strong applicability: it can be applied to various types of hydraulic cylinders and working environments, thereby meeting the needs of strip steel production. Specifically, a proportional control valve is added to the existing hydraulic valve control system. By changing the opening degree of the proportional valve, automatic pressure switching is achieved. Different pressure adjustment parameters, through the proportional valve, apply different pressures from the hydraulic cylinder to the strip steel, achieving strip clamping and preventing strip slippage.

[0084] Based on the same inventive concept, embodiments of the present invention provide an automatic pressure adjustment system for pressure rollers, such as... Figure 2 As shown, it includes:

[0085] The height data acquisition module 201 is used to acquire the height data of the steel wave pattern using a rangefinder.

[0086] The correction calculation module 202 corrects the preset initial pressure value based on the height data and the corresponding strip thickness.

[0087] The execution module 203 is used to control the pressure roller device to apply pressure to the strip steel according to the corrected initial pressure value.

[0088] Based on the same inventive concept, this embodiment provides a computer-readable storage medium storing a computer program, characterized in that the program, when executed by a processor, implements an automatic pressure adjustment method for pressure rollers.

[0089] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0090] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0091] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. An automatic pressure adjustment method for pressure rollers, characterized in that, The method includes: Use a rangefinder to obtain the height data of the steel corrugated pattern; Based on the height data and the corresponding strip thickness, the preset initial pressure value is corrected; Based on the corrected initial pressure value, the pressure roller device is controlled to apply pressure to the strip steel; The step of correcting the preset initial pressure value further includes: The target setting value for strip wave shape detection is preset based on historical data; The correction compensation value is calculated based on the target setting value, the corresponding measured value of the rangefinder, and the initial pressure value. The final pressure value is obtained by summing the corrected compensation value and the initial pressure value. The step of calculating the corrected compensation value further includes: Using the target set value and the initial pressure value as quantitative values, the measured data of the rangefinder as independent variables, and the correction compensation value as dependent variables, the algebraic relationship for calculating the correction compensation value is obtained by fitting historical data to different strip thicknesses. Substitute the target setpoint, the initial pressure value, and the measured value from the rangefinder into the algebraic formula to obtain the required correction compensation value.

2. The method as described in claim 1, characterized in that, After substituting the algebraic relation to obtain the required correction compensation value, the method includes: The average value of the correction compensation value over multiple periods is taken as the final correction compensation value.

3. The method as described in claim 1, characterized in that, The step of calculating the corrected compensation value further includes: A limiting range is set for the correction compensation value, and the correction compensation value that exceeds the limiting range is taken as the endpoint value that is closest to the correction compensation value within the limiting range.

4. The method as described in claim 1, characterized in that, The step of obtaining the height data of the steel wave pattern using a rangefinder further includes: The rangefinder acquires the actual value by scanning sequentially and takes the average value of multiple cycles as the height data used in the calculation.

5. The method as described in claim 1, characterized in that, Before correcting the preset initial pressure value, the method further includes: Based on historical data and / or experimental data, different initial pressures are preset according to the different thicknesses of the strip.

6. The method as described in claim 1, characterized in that, The pressure roller device adjusts the pressure of the pressure roller on the strip steel through a hydraulic proportional regulating valve.

7. An automatic pressure adjustment system for pressure rollers, characterized in that, The system includes: The height data acquisition module is used to acquire the height data of the steel wave pattern using a rangefinder; The correction calculation module corrects the preset initial pressure value based on the height data and the corresponding strip thickness. An execution module is used to control the pressure roller device to apply pressure to the strip steel according to the corrected initial pressure value; The correction calculation module is used for: The target setting value for strip wave shape detection is preset based on historical data; The correction compensation value is calculated based on the target setting value, the corresponding measured value of the rangefinder, and the initial pressure value. The final pressure value is obtained by summing the corrected compensation value and the initial pressure value. The correction calculation module is used for: Using the target set value and the initial pressure value as quantitative values, the measured data of the rangefinder as independent variables, and the correction compensation value as dependent variables, the algebraic relationship for calculating the correction compensation value is obtained by fitting historical data to different strip thicknesses. Substitute the target setpoint, the initial pressure value, and the measured value from the rangefinder into the algebraic formula to obtain the required correction compensation value.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the steps corresponding to the method as described in any one of claims 1 to 6.

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