A method for correcting the detected pressure of the finishing AGC pressure sensor in hot continuous rolling

Abstract

The present invention provides a method for correcting the detected pressure of the finishing AGC pressure sensor in hot continuous rolling, which relates to the technical field of metallurgical automation control. After the AGC function is started by the finishing mill in the present invention, the given data of the AGC roll gap and the detected data of the pressure sensor are determined; the execution cycle time of the AGC controller is determined and the change trend of the given data of the roll gap is judged; accordingly, the pressure fluctuation amount is calculated to correct the detected data of the pressure sensor, and the detected data of the corrected pressure sensor is obtained; after the AGC function of the finishing mill unit is started, after a certain time delay, the calculation basis of the given data of the AGC roll gap for the detected data of the pressure sensor is switched to the detected data of the corrected pressure sensor; after the AGC function of the finishing mill unit is cancelled, the calculation basis of the given data of the AGC roll gap is switched to the detected data of the pressure sensor. The present invention is beneficial to reducing the adjustment fluctuation of the AGC roll gap caused by the data fluctuation of the pressure sensor, and has positive significance for stabilizing the rolling stability of the finishing mill.

Description

Technical Field

[0001] The present invention relates to the technical field of metallurgical automation control, and particularly relates to a method for correcting the detected pressure of the finishing AGC pressure sensor in hot continuous rolling. Background Art

[0002] In the field of metal rolling, the finishing AGC pressure sensor plays a role in detecting the pressure in the AGC cylinders on both sides of the finishing mill. By calculating the piston side area and rod side area of the AGC cylinder, the force exerted by the AGC cylinder on the rolling mill and the strip is calculated, and then the strip thickness at the outlet of the rolling mill is calculated based on the pressure, roll gap, etc., to achieve the control of the strip thickness at the outlet of the finishing mill.

[0003] At present, there is no existing technology for correcting the pressure calculation of the finishing AGC pressure sensor in hot continuous rolling. However, there are the following several types of technologies regarding the installation structure of the rolling force pressure sensor of the rolling mill: 1. (Patent No.: CN218118193U, named: A pressure sensor valve block on the cylinder block of the rolling mill AGC hydraulic cylinder), the patent application proposed a pressure sensor valve block on the cylinder block of the rolling mill AGC hydraulic cylinder, including an upper hydraulic cylinder mechanism, an installation mechanism, and a lower hydraulic cylinder mechanism. 2. (Patent No.: CN108838217B, named: An installation structure of the rolling force pressure sensor for an acid rolling mill unit), the patent application proposed an installation structure of the rolling force pressure sensor for an acid rolling mill unit, effectively preventing the influence of the harsh environment inside the rolling mill on the pressure sensor, greatly improving the service life of the pressure sensor, and having good reliability of the pressure sensor and stable automatic control system for the cold acid rolling mill unit.

[0004] However, due to various reasons such as the installation position of the pressure sensor and the pressure mechanism in the detection valve platform, when the servo valve of the AGC cylinder actuator frequently adjusts the oil inlet and outlet in the oil cylinder cavity, it will have a certain influence on the detected pressure in the cylinder; in summary, at present, there is a lack of a method for correcting the detected pressure of the AGC cylinder pressure sensor in the finishing mill of hot continuous rolling in the field of metal rolling, which can effectively correct the detected pressure value of the pressure sensor by combining automatic means with the action principle of the servo valve controlling the AGC cylinder, and control the stability of the strip during the rolling process.

[0005] Therefore, we introduce a method for correcting the detected pressure of the finishing AGC pressure sensor in hot continuous rolling.

[0006] The above information disclosed in the background art section is only used to enhance the understanding of the background of the present disclosure, so it may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention

[0007] The purpose of the present invention is to provide a method for correcting the detected pressure of the finishing AGC pressure sensor in hot continuous rolling to solve the problems raised in the above background art.

[0008] To achieve the above object, the present invention provides the following technical solution: A method for correcting the detected pressure of the finishing AGC pressure sensor in hot continuous rolling, including:

[0009] Step 1: The finishing mill starts the AGC function to clarify the given data of the AGC roll gap , and the detected data of the AGC pressure sensor ;

[0010] Step 2: Determine the execution cycle time of the AGC controller , and take the execution cycle time of the AGC controller as the time interval, and sequentially obtain the given data of the AGC roll gap values in the previous and subsequent two cycles, and judge the change trend of the given data of the AGC roll gap in the previous and subsequent two cycles;

[0011] Step 3: According to the change trend of the given data of the AGC roll gap in the previous and subsequent two cycles, construct a pressure fluctuation formula, and calculate the pressure fluctuation caused by the change of the given data of the AGC roll gap before and after ;

[0012] Step 4: Correct the pressure fluctuation caused by the change of the given data of the AGC roll gap before and after to the detected data of the pressure sensor to obtain the corrected detected data of the pressure sensor ;

[0013] Step 5: After the finishing mill unit starts the AGC function, delay for a certain time , and switch the calculation basis of the given data of the AGC roll gap from the detected data of the pressure sensor to the corrected detected data of the pressure sensor ;

[0014] Step 6: After the AGC function of the finishing mill unit is cancelled, switch the calculation basis of the given data of the AGC roll gap from the corrected detected data of the pressure sensor to the detected data of the pressure sensor .

[0015] Furthermore, when the finishing mill starts the AGC function to clarify the given data of the AGC roll gap , and the detected data of the AGC pressure sensor ; Taking the 8th stand of the finishing mill as an example, after each stand bites the steel and starts the AGC, the given roll gap and the detected data of the pressure sensor of each stand can be clarified.

[0016] Furthermore, determine the execution cycle time of the AGC controller , taking is the time interval, and at the th time point, the given AGC roll gap data at this time is , and at the th time point, the given AGC roll gap data at this time is , and a formula is constructed to judge the change trend of the given AGC roll gap data in the previous and next two cycles. The formula is:

[0017]

[0018] In the formula, represents the change trend of the given AGC roll gap data in the previous and next two cycles, represents the given AGC roll gap data recorded at the th time point, that is, the value of the given AGC roll gap data in the previous cycle, with the unit of mm, represents the given AGC roll gap data recorded at the th time point, that is, the value of the given AGC roll gap data in the next cycle, with the unit of mm. Among them, is a positive integer.

[0019] Furthermore, determine the execution cycle time of the AGC controller, where represents the cycle period of the real-time detected pressure of the finishing AGC pressure sensor in the controller. This value is given empirically, and the value range is [1 - 16], with the unit of ms.

[0020] Furthermore, first, construct a formula to calculate the hardness deviation ratio of the current steel material relative to the standard material:

[0021]

[0022] In the formula, represents the hardness deviation ratio of the current steel material relative to the standard material, represents the hardness of the current steel measured by the hardness testing equipment, represents the hardness of the standard material of the same kind of steel;

[0023] Based on the hardness deviation ratio of the current steel material relative to the standard material, construct a steel material coefficient:

[0024]

[0025] In the formula, Denoted as the steel material coefficient;

[0026] Construct a formula to calculate the temperature deviation ratio of the current steel material relative to the standard material:

[0027]

[0028] Based on the temperature deviation ratio of the current steel material relative to the standard material, construct a formula to calculate the temperature coefficient:

[0029]

[0030] In the formula, Denoted as the temperature coefficient;

[0031] Based on the steel material coefficient and the temperature coefficient, construct the gain coefficient of the pressure fluctuation caused by the change in the AGC roll gap setting data before and after:

[0032]

[0033] In the formula, Denoted as the gain coefficient of the pressure fluctuation caused by the change in the AGC roll gap setting data before and after;

[0034] Finally, according to the AGC roll gap setting data The changing trend of the two cycles before and after, construct the pressure fluctuation formula:

[0035]

[0036] Among them, Denoted as the pressure fluctuation caused by the change in the AGC roll gap setting data before and after, with the unit of bar; Denoted as the unit conversion coefficient between the AGC roll gap setting data and the pressure detected by the AGC pressure sensor; Denoted as the gain coefficient of the pressure fluctuation caused by the change in the AGC roll gap setting data before and after.

[0037] Furthermore, the unit conversion coefficient between the AGC roll gap setting data and the pressure detected by the AGC pressure sensor, this value is given empirically, and the value range is [50 - 150]; the gain coefficient of the pressure fluctuation caused by the change in the AGC roll gap setting data before and after, the value range is [0.1 - 1].

[0038] Furthermore, correct the pressure fluctuation caused by the change in the AGC roll gap setting data before and after to the data detected by the pressure sensor In the corrected data detected by the pressure sensor The calculation formula is:

[0039]

[0040] In the formula, represents the detected data of the corrected pressure sensor, represents the pressure fluctuation caused by the change before and after the given data of the AGC roll gap, with the unit of bar; represents the detected data of the AGC pressure sensor, with the unit of bar.

[0041] Further, after the finishing mill unit starts the AGC function, delay for a certain time , and calculate the given data of the AGC roll gap based on the detected data of the pressure sensor and switch it to the detected data of the corrected pressure sensor .

[0042] Further, after the finishing mill unit starts the AGC function, delay for a certain time , and this value is empirically given, with the value range of [100 - 500] and the unit of ms.

[0043] Further, after the AGC function of the finishing mill unit is cancelled, calculate the given data of the AGC roll gap based on the detected data of the corrected pressure sensor and switch it to the detected data of the pressure sensor .

[0044] Compared with the prior art, the beneficial effects of the present invention are:

[0045] (1) After determining the execution cycle time of the AGC controller in the present invention, judge the change trend of the given data of the AGC roll gap in the previous and subsequent two cycles, and then calculate the pressure fluctuation to correct the detected data of the pressure sensor, providing an accurate data basis for the AGC roll gap adjustment, making the roll gap adjustment more stable, and the control method is simple and easy to implement. After the step of correcting the detected data of the pressure sensor is completed, delay for a certain time and switch the calculation basis of the given data of the AGC roll gap from the detected data of the pressure sensor to the detected data of the corrected pressure sensor, which is beneficial to reducing the AGC roll gap adjustment fluctuation problem caused by the data fluctuation of the pressure sensor and has a positive significance for stabilizing the rolling stability of the finishing mill. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 is a schematic diagram of the overall method flow of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0047] In order to make the purpose, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to specific embodiments.

[0048] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the ordinary meanings understood by those of ordinary skill in the field to which the present invention pertains. The "first", "second" and similar terms used in the present invention do not denote any order, quantity or importance, but are only used to distinguish different components. The terms such as "comprising" or "including" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left" and "right" are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0049] Embodiment:

[0050] Please refer to Figure 1 , the present invention provides a technical solution:

[0051] A method for correcting the detected pressure of the finishing AGC pressure sensor in hot continuous rolling, the specific steps include:

[0052] Step 1: The finishing mill starts the AGC function to clarify the given data of the AGC roll gap , and the detected data of the AGC pressure sensor ;

[0053] When the finishing mill starts the AGC function and after each stand has bitten the steel, the system can obtain the given data of the AGC roll gap and the detected data of the AGC pressure sensor , where the given data of the AGC roll gap is the desired roll gap size during the finishing process and determines the final rolling thickness of the rolled piece. The detected data of the AGC pressure sensor is used to calculate the strip thickness at the mill outlet and is a key parameter for controlling the rolling process.

[0054] Step 2: Determine the execution cycle time of the AGC controller , and take the execution cycle time of the AGC controller as the time interval, and successively obtain the values of the given data of the AGC roll gap in the previous and the next cycles, and judge the changing trend of the given data of the AGC roll gap in the previous and the next cycles;

[0055] Determine the execution cycle time of the AGC controller , and within each time interval, the system will record the given data of the AGC roll gap , record the AGC roll gap set data at this time at the th time point, and the AGC roll gap set data at this time is , record the AGC roll gap set data at this time at the th time point, and the AGC roll gap set data at this time is , construct a formula to judge the changing trend of the AGC roll gap set data in the previous and next two cycles. The formula is:

[0056]

[0057] In the formula, represents the changing trend of the AGC roll gap set data in the previous and next two cycles, represents the AGC roll gap set data recorded at the th time point, that is, the value of the AGC roll gap set data in the previous cycle, with the unit of mm, represents the AGC roll gap set data recorded at the th time point, that is, the value of the AGC roll gap set data in the next cycle, with the unit of mm. Among them, is a positive integer, where represents the cycle period of the real-time detected pressure of the finishing AGC pressure sensor in the controller. This value is given empirically, and the value range is [1, 16], with the unit of ms. By calculating the changing trend of the roll gap set data, subsequent pressure fluctuation correction can be realized, and the problem of AGC roll gap adjustment fluctuation caused by the data fluctuation of the pressure sensor can be reduced.

[0058] Step 3: According to the changing trend of the AGC roll gap set data in the previous and next two cycles, construct a pressure fluctuation amount formula, and calculate the pressure fluctuation amount caused by the change of the AGC roll gap set data before and after ;

[0059] First, construct a formula to calculate the hardness deviation ratio of the current steel material relative to the standard material:

[0060]

[0061] In the formula, represents the hardness deviation ratio of the current steel material relative to the standard material, which reflects the difference degree of the current steel material and the standard material in terms of hardness, and is used to calculate the pressure fluctuation amount to help correct the detected data of the pressure sensor, so that the correction of the pressure is more in line with the actual characteristics of the steel. represents the current steel hardness measured by the hardness testing equipment, Represents the hardness of the standard material of the same type of steel. Among them, since the hardness of the standard material of the steel remains unchanged after being determined, the hardness deviation ratio and the current steel hardness have a linear relationship and are positively correlated. The hardness of the current steel is higher than the hardness of the standard material , and the hardness deviation ratio is a positive value; otherwise, it is a negative value;

[0062] The change in the hardness deviation ratio of the steel material relative to the standard material will change the response characteristics of the steel to pressure during rolling. Therefore, based on the hardness deviation ratio of the current steel material relative to the standard material, a steel material coefficient is constructed:

[0063]

[0064] In the formula, represents the steel material coefficient, which is a coefficient calculated according to the hardness deviation ratio . The hardness deviation ratio is non-linearly transformed to provide data for constructing the pressure fluctuation gain coefficient in the subsequent process. As the hardness deviation ratio increases, the steel material coefficient increases. When the hardness deviation ratio is relatively large, the steel material coefficient approaches , indicating that the hardness deviation of the steel has a greater impact on the material coefficient . Otherwise, it is close to , and the impact is smaller;

[0065] Construct a formula to calculate the temperature deviation ratio of the current steel material relative to the standard material:

[0066]

[0067] In the formula, represents the temperature deviation ratio of the current steel material relative to the standard material, which reflects the difference degree of the current steel in terms of temperature from the standard material, provides data for more accurately evaluating the change of the steel performance under the influence of temperature, and thus better controls and adjusts the rolling process under different temperature conditions. represents the temperature of the current steel, is the temperature of the standard material of the same type of steel. The higher the temperature of the current steel, the larger the temperature deviation ratio . The standard temperature As a fixed parameter, its value will not change after being determined. Therefore, as the current temperature of the steel increases, the temperature deviation ratio increases. When the temperature of the steel is lower than the standard temperature of the steel , the temperature deviation ratio is negative, indicating that the temperature of the steel is lower than the standard temperature.

[0068] Based on the temperature deviation ratio of the current steel material relative to the standard material, a formula is constructed to calculate the temperature coefficient:

[0069]

[0070] In the formula, represents the temperature coefficient, which is positively correlated with the temperature deviation ratio . As the temperature deviation ratio increases, the temperature coefficient increases, realizing the correction effect of temperature change on the pressure control of the steel during the production process, thereby optimizing the pressure control during the production process and reducing the error caused by temperature change;

[0071] Based on the steel material coefficient and the temperature coefficient, a gain coefficient of the pressure fluctuation caused by the change in the AGC roll gap given data is constructed:

[0072]

[0073] In the formula, represents the gain coefficient of the pressure fluctuation caused by the change in the AGC roll gap given data. The steel material coefficient and the temperature coefficient jointly determine the gain coefficient of the pressure fluctuation through a product relationship, and are positively correlated, reflecting the gain effect of the steel material and temperature changes on the pressure fluctuation caused by the AGC roll gap given data. It is one of the data for calculating the correction amount of the pressure fluctuation, and is used to correct the pressure fluctuation caused by the AGC roll gap given data to ensure more accurate pressure control during the production process under different material and temperature conditions;

[0074] Finally, considering the material hardness and temperature characteristics of the steel, which jointly affect the calculation result of the pressure fluctuation, according to the change trend of the AGC roll gap given data in the previous and next two cycles, a pressure fluctuation formula is constructed:

[0075]

[0076] Among them, It is expressed as the pressure fluctuation caused by the change in the AGC roll gap given data before and after, with the unit of bar. By calculating this pressure fluctuation, the relationship between the AGC roll gap given data and the pressure sensor can be corrected to ensure the accuracy of the pressure measurement data, thereby improving the automation control accuracy of the production process; It is expressed as the amplitude of the change in the AGC roll gap given data before and after, with the unit of mm; It is expressed as the unit conversion coefficient between the AGC roll gap given data and the pressure detected by the AGC pressure sensor; It is expressed as the gain coefficient of the pressure fluctuation caused by the change in the AGC roll gap given data before and after. When the amplitude or the gain coefficient of the pressure fluctuation increases, the pressure fluctuation will increase.

[0077] Step 4: Correct the pressure fluctuation caused by the change in the AGC roll gap given data before and after to the data detected by the pressure sensor to obtain the corrected data detected by the pressure sensor ;

[0078] Correct the pressure fluctuation caused by the change in the AGC roll gap given data before and after to the data detected by the pressure sensor The calculation formula for the corrected data detected by the pressure sensor is:

[0079]

[0080] In the formula, represents the corrected data detected by the pressure sensor, represents the pressure fluctuation caused by the change in the AGC roll gap given data before and after, with the unit of bar; represents the data detected by the AGC pressure sensor, with the unit of bar.

[0081] Step 5: After the finishing mill unit starts the AGC function, delay for a certain time , and switch the calculation basis of the AGC roll gap given data from the data detected by the pressure sensor to the corrected data detected by the pressure sensor ;

[0082] Since the data detected by the pressure sensor may be interfered by various factors, after the finishing mill unit starts the AGC function, when the set delay time is reached, determine a suitable delay time , the calculation basis of the AGC roll gap given data is switched to the corrected pressure sensor detection data according to the pressure sensor detection data Switch to the corrected pressure sensor detection data , avoiding the influence of different steel material hardness and temperature conditions, thereby improving the stability of the rolling process. Among them, after the finishing mill unit starts the AGC function, it delays for a certain time , this value is given empirically, and the value range is [100, 500], and the unit is ms.

[0083] Step 6: After the AGC function of the finishing mill unit is cancelled, switch the calculation basis of the AGC roll gap given data to the corrected pressure sensor detection data Switch to the pressure sensor detection data .

[0084] After detecting that the AGC function of the finishing mill unit is cancelled, the calculation of the pressure fluctuation amount no longer depends on the change of the roll gap given data, and directly uses the data detected by the pressure sensor .

[0085] Next, the implementation process of the method of the present invention will be described in combination with specific application examples.

[0086] In this application example, taking the number of finishing mill stands as 8 as an example, the operation is carried out according to the following steps:

[0087] (1) The finishing mill starts the AGC function and clarifies the AGC roll gap given data , the AGC pressure sensor detection data , as shown in Table 1 below:

[0088]

[0089] Table 1

[0090] It should be noted that the pressure detected by the AGC pressure sensor changes in real time with the controller detection execution cycle, and the values in the table are fixed values at a certain moment.

[0091] (2) Determine that the AGC controller execution cycle time is 4 ms, and judge the change trend of the AGC roll gap given data before and after two consecutive cycles, as shown in Table 2 below:

[0092]

[0093] Table 2

[0094] (3) According to the change trend of the AGC roll gap given data before and after two consecutive cycles, process and calculate the pressure fluctuation amount caused by the change of the AGC roll gap given data, and round the final result to 2 decimal places according to the rounding rule, and the current steel hardness , the standard material hardness of the same type of steel , first, construct a formula to calculate the hardness deviation ratio of the current steel material relative to the standard material:

[0095]

[0096] Based on the hardness deviation ratio of the current steel material relative to the standard material, construct a steel material coefficient:

[0097]

[0098] Actual rolling temperature , standard rolling temperature Construct a formula to calculate the temperature deviation ratio of the current steel material relative to the standard material:

[0099]

[0100] Based on the temperature deviation ratio of the current steel material relative to the standard material, construct a formula to calculate the temperature coefficient:

[0101]

[0102] According to the steel material coefficient and the temperature coefficient, construct the pressure fluctuation gain coefficient caused by the change in the AGC roll gap setting data:

[0103]

[0104] In the formula, is expressed as the pressure fluctuation gain coefficient caused by the change in the AGC roll gap setting data;

[0105] Finally, according to the AGC roll gap setting data The changing trend of the previous and next two cycles, construct the pressure fluctuation formula:

[0106]

[0107] Among them, is expressed as the pressure fluctuation caused by the change in the AGC roll gap setting data, with the unit of bar;, with the unit of mm; is expressed as the unit conversion coefficient of the AGC roll gap setting data and the pressure detected by the AGC pressure sensor; is expressed as the pressure fluctuation gain coefficient caused by the change in the AGC roll gap setting data, as shown in Table 3 below:

[0108]

[0109] Table 3

[0110] (4)Modify the pressure fluctuation caused by the change of the AGC roll gap given data before and after to the pressure sensor detection data to obtain the corrected pressure sensor detection data, where the calculation formula is:

[0111]

[0112] The set tension coefficient of the head of each stand And the calculated head tension are shown in Table 4 below:

[0113]

[0114] Table 4

[0115] (5)After the finishing mill unit starts the AGC function, delay for a certain time, and switch the calculation basis of the AGC roll gap given data from the pressure sensor detection data to the corrected pressure sensor detection data, where the delay time is shown in Table 5 below:

[0116]

[0117] Table 5

[0118] (6)After the AGC function of the finishing mill unit is cancelled, switch the calculation basis of the AGC roll gap given data from the corrected pressure sensor detection data to the pressure sensor detection data.

[0119] It can be found from the above application examples that the method for correcting the pressure detected by the AGC pressure sensor in the hot continuous rolling of the present invention can perform real-time dynamic correction on the applied pressure based on which the roll gap is adjusted after the AGC is started during the strip rolling process in actual production, which is more convenient and flexible. It has a positive significance for reducing the problem of AGC roll gap adjustment fluctuation caused by the data fluctuation of the pressure sensor and stabilizing the rolling stability of the finishing mill.

[0120] In summary, the control method of this embodiment determines the execution cycle time of the AGC controller according to the AGC roll gap given data and the pressure sensor detection data after the finishing mill starts the AGC function, judges the change trend of the AGC roll gap given data in the previous and subsequent two cycles, processes and calculates the pressure fluctuation caused by the change of the AGC roll gap given data before and after, and modifies it to the pressure sensor detection data to obtain the corrected pressure sensor detection data. After the finishing mill unit starts the AGC function, delay for a certain time, switch the calculation basis of the AGC roll gap given data from the pressure sensor detection data to the corrected pressure sensor detection data. After the AGC function of the finishing mill unit is cancelled, switch the calculation basis of the AGC roll gap given data to the pressure sensor detection data. It is beneficial to reduce the problem of AGC roll gap adjustment fluctuation caused by the data fluctuation of the pressure sensor and has a positive significance for stabilizing the rolling stability of the finishing mill

[0121] The above formulas are all dimensionless and take their numerical values for calculation. The formulas are obtained by collecting a large amount of data and performing software simulation to get a formula closest to the actual situation. The preset parameters in the formulas are set by those skilled in the art according to the actual situation.

[0122] The above embodiments can be implemented in whole or in part by software, hardware, firmware or any other combination. When implemented using software, the above embodiments can be implemented in whole or in part in the form of a computer program product. Those skilled in the art will realize that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, or by a combination of computer software and electronic hardware. Whether these functions are executed by hardware or software methods depends on the specific application and design constraints of the technical solution.

[0123] The units described as separate components may or may not be physically separated. The components shown as units may or may not be physical units. They can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0124] As described above, only the specific implementation manners of this application are provided, but the protection scope of this application is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application, and all of them should be covered by the protection scope of this application.

Claims

1. A method for correcting the detected pressure of the finishing AGC pressure sensor in hot continuous rolling, characterized in that, Including: Step 1: The finishing mill starts the AGC function and determines the given data of the AGC roll gap , and the AGC pressure sensor detects data ; Step 2: Determine the execution cycle time of the AGC controller , taking the execution cycle time of the AGC controller as the time interval, successively obtain the given data of the AGC roll gap values in the previous and subsequent cycles, and judge the changing trend of the given data of the AGC roll gap between the previous and subsequent cycles; Step 3: According to the given data of the AGC roll gap Based on the changing trends of the previous and subsequent cycles, construct a formula for the pressure fluctuation quantity, and calculate the pressure fluctuation quantity caused by the change in the given data of the AGC roll gap ; Step 4: Correct the pressure fluctuation caused by the change in the AGC roll gap setting data to the pressure sensor detection data to obtain the corrected pressure sensor detection data ; Step 5: After the finishing mill unit starts the AGC function, delay for a certain period of time , and calculate the AGC roll gap set data based on the detection data of the pressure sensor and switch it to the corrected detection data of the pressure sensor ; Step 6: After the AGC function of the finishing mill unit is cancelled, correct the calculation basis of the AGC roll gap given data to the detection data of the pressure sensor and switch it to the detection data of the pressure sensor .

2. The method for correcting the detected pressure of the finishing AGC pressure sensor in hot continuous rolling according to claim 1, characterized in that, In the said step 1, including: The finishing mill starts the AGC function to clarify the given data of the AGC roll gap , the detected data of the AGC pressure sensor ; Taking the 8th stand of the finishing mill as an example, after each stand bites the steel respectively and the AGC is started, the given data of the roll gap of each stand and the detected data of the pressure sensor can be clarified.

3. The method for correcting the detected pressure of the finishing AGC pressure sensor in hot continuous rolling according to claim 1, characterized in that, In the said step 2, including: Determine the execution cycle time of the AGC controller , with as the time interval, record the given data of the AGC roll gap at the th time point as , and at the th time point, record the given data of the AGC roll gap as , and construct a formula to judge the change trend of the given data of the AGC roll gap in the previous and next cycles. The formula is: In the formula, is expressed as the given data of the AGC roll gap for the changing trends in the previous and next cycles, is expressed as the th time point to record the given data of the AGC roll gap at this time, that is, the value of the AGC roll gap given data in the previous cycle, with the unit of mm. is expressed as the th time point to record the given data of the AGC roll gap at this time, that is, the value of the AGC roll gap given data in the next cycle, with the unit of mm, where is a positive integer.

4. The method for correcting the detected pressure of the finishing AGC pressure sensor in hot continuous rolling according to claim 3, characterized in that Determine the execution cycle time of the AGC controller , where represents the cycle period in the controller of the real-time detected pressure by the finishing AGC pressure sensor. This value is given empirically, with a value range of [1 - 16] and the unit of ms.

5. The method for correcting the detected pressure of the finishing AGC pressure sensor in hot continuous rolling according to claim 1, characterized in that, Method for constructing pressure fluctuation caused by changes before and after AGC roll gap setting data is as follows: First, construct a formula to calculate the hardness deviation ratio of the current steel material relative to the standard material: In the formula, represents the hardness deviation ratio of the current steel material relative to the standard material, represents the current hardness of the steel measured by the hardness testing equipment, represents the hardness of the standard material of the same kind of steel; Based on the hardness deviation ratio of the current steel material relative to the standard material, construct a steel material coefficient: In the formula, represents the steel material coefficient; Construct a formula to calculate the temperature deviation ratio of the current steel material relative to the standard material: Based on the temperature deviation ratio of the current steel material relative to the standard material, construct a formula to calculate the temperature coefficient: In the formula, is expressed as the temperature coefficient; According to the steel material coefficient and the temperature coefficient, construct a pressure fluctuation gain coefficient caused by the change before and after the given AGC roll gap data: In the formula, represents the gain coefficient of the pressure fluctuation caused by the change before and after the given data of the AGC roll gap; Finally, based on the given data of the AGC roll gap Construct a pressure fluctuation formula according to the changing trends in the two previous and subsequent cycles: Among them, represents the pressure fluctuation caused by the change before and after the AGC roll gap given data, and the unit is bar; represents the unit conversion coefficient between the AGC roll gap given data and the pressure detected by the AGC pressure sensor; represents the gain coefficient of the pressure fluctuation caused by the change before and after the AGC roll gap given data.

6. The method for correcting the detected pressure of the finishing AGC pressure sensor in hot continuous rolling according to claim 5, characterized in that, AGC roll gap setting data and AGC pressure sensor detected pressure unit conversion coefficient , this value is empirically given, and the value range is [50 - 150]; the pressure fluctuation gain coefficient caused by the change of AGC roll gap setting data before and after , the value range is [0.1 - 1].

7. The method for correcting the detected pressure of the finishing AGC pressure sensor in hot continuous rolling according to claim 1, characterized in that, In the said step 4, including: The pressure fluctuation caused by the change in the AGC roll gap setting data before and after is corrected to the data detected by the pressure sensor Among them, the formula for the data detected by the corrected pressure sensor is as follows: + In the formula, represents the corrected pressure sensor detection data, represents the pressure fluctuation caused by the change before and after the AGC roll gap given data, with the unit of bar; represents the AGC pressure sensor detection data, with the unit of bar.

8. The method for correcting the detected pressure of the finishing AGC pressure sensor in hot continuous rolling according to claim 1, characterized in that, In the said step 5, including: After the finishing mill unit starts the AGC function, delay for a certain period of time , and calculate the AGC roll gap setting data based on the detection data of the pressure sensor and switch it to the corrected detection data of the pressure sensor .

9. The method for correcting the detected pressure of the finishing AGC pressure sensor in hot continuous rolling according to claim 8, characterized in that, After the finishing mill unit starts the AGC function, it delays for a certain period of time . This value is given by experience, and the value range is [100 - 500], and the unit is ms.

10. The method for correcting the detected pressure of the finishing AGC pressure sensor in hot continuous rolling according to claim 1, characterized in that, In the said step 6, including: After the AGC function of the finishing mill unit is cancelled, the calculation basis of the AGC roll gap setting data is corrected to the detection data of the pressure sensor Switch to the detection data of the pressure sensor .

Images