A hot rolling production line AGC oil cylinder on-line automatic step response test method and device

Abstract

The application discloses a kind of hot rolling production line AGC oil cylinder online automatic step response test method and device, comprising: the interlock of oil cylinder automatic step response test starting condition, control online AGC oil cylinder step response test timing, start oil cylinder automatic step response test;According to the running state of AGC oil cylinder roll gap, judge whether the end time of stroke is overtime, complete oil cylinder one-time automatic step response test timing;Three-cycle test, calculate test data average and automatically compare with standard value, judge whether oil cylinder meets response speed requirement;Through picture, each AGC oil cylinder step response test result is shown and step response data processing is carried out.The application automatically step response test control analysis method can quickly obtain oil cylinder online state automatic step response test data by the control and accurate algorithm of software, realizes the correction of oil cylinder characteristics and the judgment of deterioration tendency, improves product quality, convenient operation, and low time cost.

Description

Technical Field

[0001] This invention relates to the technical field of closed-loop control of AGC cylinders in hot rolling production lines, and particularly to an online automatic step response testing method and device for AGC cylinders in hot rolling production lines. Background Technology

[0002] Currently, there are six finishing mills on the 2032mm hot-rolled strip production line at Liuzhou Iron & Steel Group's hot-rolled strip plant. Each finishing mill's reduction system is divided into an operating side and a drive side, each controlled separately. Both sides use an electric and hydraulic roller gap adjustment method for closed-loop position control. Each mill has two AGC cylinders, which are crucial pieces of equipment in the entire finishing mill. When the finishing mill's reduction system performs pre-positioning of the large roller gap, the electric cylinders first move to the correct position, and then the AGC cylinders perform fine-tuning of the roller gap. During the strip threading process, the electric roller gap remains constant, but to ensure the finishing mill exit thickness accuracy, the AGC needs to adjust it in real time. Therefore, the response speed of the AGC cylinders is particularly important, especially during the head bite impact, when the AGC cylinders need to quickly adjust the roller gap.

[0003] The control accuracy of the AGC cylinders in the finishing mill is crucial to the entire hot rolling production line. During strip rolling, the response speed of the AGC cylinders affects the speed and stability of the roll gap adjustment on both sides, indirectly impacting product thickness and shape quality. However, after prolonged use and break-in, the response time characteristics of the AGC system change. The deterioration of the cylinder's step response characteristics directly affects the control accuracy of the AGC servo system. Traditionally, the step response characteristics of the AGC cylinders are analyzed manually and periodically. This is labor-intensive, requiring extensive comparative analysis of roll gap settings, feedback data, and response times using ibaPDA data acquisition and analysis software. This is inefficient and requires operators to be proficient in ibaPDA software and have a deep understanding of the AGC control system to complete the analysis. Traditional cylinder step response tests are conducted offline, meaning the cylinders are not installed on the rolling mill but in a laboratory environment. This results in test results that do not accurately reflect the influence of various environmental factors after cylinder installation, thus compromising the accuracy of the test data. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] In view of the aforementioned existing problems, the present invention is proposed.

[0006] Therefore, this invention provides an online automatic step response test method and device for AGC cylinders in hot rolling production lines. This solves the problem that existing cylinder step response tests rely on manual, periodic analysis, which is labor-intensive. Furthermore, these tests are conducted in a laboratory environment with the cylinders offline, resulting in test results that cannot accurately reflect the influence of various environmental factors after cylinder installation, thus failing to guarantee the authenticity of the test data.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0008] In a first aspect, embodiments of the present invention provide an online automatic step response test method for AGC cylinders in a hot rolling production line, comprising:

[0009] Interlock the start conditions of the automatic step response test of the hydraulic cylinder to control the timing of the online AGC hydraulic cylinder step response test and start the automatic step response test of the hydraulic cylinder.

[0010] Based on the operating status of the AGC cylinder roller gap, determine whether the end time of the stroke has exceeded the time limit, and complete the timing of one automatic step response test of the cylinder.

[0011] The test is repeated three times, the average value of the test data is calculated and automatically compared with the standard value to determine whether the hydraulic cylinder meets the response speed requirements;

[0012] The system displays the step response test results for each AGC cylinder and performs step response data processing.

[0013] As a preferred embodiment of the online automatic step response test method for AGC cylinders in hot rolling production lines described in this invention, the automatic step response test start conditions for the cylinders include:

[0014] When the hydraulic condition is ready, the automatic step response test of the hydraulic cylinder is started, and the automatic step response test of the hydraulic cylinder is entered.

[0015] When the hydraulic cylinder step response test button is clicked directly, the hydraulic cylinder automatic step response test will be started and the hydraulic cylinder automatic step response test phase will begin.

[0016] When three cycles of step test are completed and the end time is reached, the current step test process ends and the automatic step response test of the hydraulic cylinder is no longer initiated.

[0017] As a preferred embodiment of the online automatic step response test method for AGC cylinders in hot rolling production lines according to the present invention, the method for determining whether the end time of the stroke has been exceeded based on the operating state of the AGC cylinder roll gap includes:

[0018] After the automatic step response test of the hydraulic cylinder is started, the roll gap will perform downward and upward operations according to the given roll gap amount;

[0019] Timing is started at the moment of the roll gap pressing and lifting operation, and ends when 90% of the target value is reached. The end timing time is the response time of the automatic step response test of the hydraulic cylinder.

[0020] If the response time exceeds the standard time value, a warning alarm will be issued.

[0021] As a preferred embodiment of the online automatic step response test method for AGC cylinders in hot rolling production lines described in this invention, it further includes:

[0022] The first step of the automatic step response test: According to the given amount of step roll gap, the roll gap is automatically pressed down and moved. At the same time, the system automatically starts the timing of the first roll gap pressing. When the cylinder moves to 90% of the target stroke, the timing ends. At this time, the time consumed for the first roll gap pressing to reach 90% is obtained.

[0023] The second step of the automatic step response test: Two seconds after the roll gap is pressed down in the first step, the roll gap recovery and lifting operation is automatically performed. That is, the original set roll gap is restored based on the first roll gap pressing down. The timing method for lifting the roll gap is the same as the timing method for pressing down the roll gap. The timing starts when the roll gap is given and ends immediately when the roll gap is lifted to 90% of the target value. At this time, the time consumed by the first roll gap lifting to 90% is obtained.

[0024] After the above two steps, the timing process of one automatic step response test of the hydraulic cylinder is completed.

[0025] As a preferred embodiment of the online automatic step response test method for AGC cylinders in hot rolling production lines described in this invention, the method includes: three cycles of the test; after all three step response test processes are completed, the average value of the three step response tests is taken as the final test time result.

[0026] As a preferred embodiment of the online automatic step response test method for AGC cylinders in hot rolling production lines described in this invention, it further includes:

[0027] By comparing with the standard reference value for step response test time;

[0028] An alarm signal will be output if the final test time result is greater than the standard reference value.

[0029] When the final test time is not greater than the standard reference value, the hydraulic cylinder meets the response speed requirement and the test is completed.

[0030] As a preferred embodiment of the online automatic step response testing method for AGC cylinders in a hot rolling production line according to the present invention, the method includes: displaying the step response test results of each AGC cylinder on a screen and performing step response data processing, including:

[0031] The screen displays the results of the three most recent step response tests and the average value of the three test results;

[0032] If the result of the step response test exceeds the standard time, the displayed value will turn into a red warning to alert maintenance personnel.

[0033] If the value does not turn red, it means that the hydraulic cylinder has successfully passed the step response test standard.

[0034] The obtained automatic step response test results are processed according to requirements.

[0035] Secondly, embodiments of the present invention provide an online automatic step response testing device for AGC cylinders in a hot rolling production line, comprising,

[0036] The control start module is used to interlock the start conditions of the automatic step response test of the hydraulic cylinder, control the timing of the online AGC hydraulic cylinder step response test, and start the automatic step response test of the hydraulic cylinder.

[0037] The roller gap operation module is used to determine whether the end time of the stroke has been exceeded based on the running status of the roller gap of the AGC cylinder, and to complete the timing of one automatic step response test of the cylinder.

[0038] The three-stage automatic step response test trigger module is used to cycle the test three times, calculate the average value of the test data and automatically compare it with the standard value to determine whether the hydraulic cylinder meets the response speed requirements.

[0039] The display module is used to display the step response test results of each AGC cylinder on the screen and to process the step response data.

[0040] Thirdly, embodiments of the present invention provide a computing device, including:

[0041] Memory and processor;

[0042] The memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions. When the one or more programs are executed by the one or more processors, the one or more processors implement the online automatic step response test method for AGC cylinders in hot rolling production lines as described in any embodiment of the present invention.

[0043] Fourthly, embodiments of the present invention provide a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the online automatic step response test method for the AGC cylinder of the hot rolling production line.

[0044] The beneficial effects of this invention are as follows: The automatic step response test control and analysis method of this invention can quickly obtain automatic step response test data of the hydraulic cylinder in the online state through software control and precise algorithms, realize the correction of hydraulic cylinder characteristics and the judgment of deterioration tendency, improve product quality, facilitate operation, reduce time costs, and provide great help for the maintenance of AGC servo system of Liugang hot rolling production line. Attached Figure Description

[0045] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0046] Figure 1 This is a control flowchart of the online automatic step response testing method and device for AGC cylinders in a hot rolling production line according to an embodiment of the present invention;

[0047] Figure 2 This is a graph showing the three-stage automatic step response test curves of the online automatic step response test method and device for AGC cylinders in a hot rolling production line according to an embodiment of the present invention.

[0048] Figure 3 This is a schematic diagram of the configuration and printing function of the archiving control of the online automatic step response test method and device for AGC cylinders in a hot rolling production line according to an embodiment of the present invention. Detailed Implementation

[0049] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0050] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0051] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0052] This invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of this invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not be construed as limiting the scope of protection of this invention. In actual fabrication, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0053] Furthermore, in the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used solely for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In addition, the terms "first," "second," or "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0054] Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" in this invention should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; similarly, they can refer to mechanical connections, electrical connections, or direct connections, or indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0055] Example 1

[0056] Reference Figure 1 As one embodiment of the present invention, this embodiment provides an online automatic step response test method for AGC cylinders in a hot rolling production line, comprising:

[0057] S1: Interlock the start conditions of the automatic step response test of the hydraulic cylinder, control the timing of the online AGC hydraulic cylinder step response test, and start the automatic step response test of the hydraulic cylinder.

[0058] Furthermore, the initiation conditions for the automatic step response test of the hydraulic cylinder include:

[0059] When the hydraulic condition is ready, the automatic step response test of the hydraulic cylinder is started, and the automatic step response test of the hydraulic cylinder is entered.

[0060] When the hydraulic cylinder step response test button is clicked directly, the hydraulic cylinder automatic step response test will be started and the hydraulic cylinder automatic step response test phase will begin.

[0061] When three cycles of step test are completed and the end time is reached, the current step test process ends and the automatic step response test of the hydraulic cylinder is no longer initiated.

[0062] It should be noted that during the automatic step response test, the relevant conditions are interlocked, which increases the importance of the start-up timing. This can prevent the strip steel in the AGC hydraulic cylinder step response test from being affected by the step response test roll gap during the strip rolling process, which could lead to abnormal product thickness and the generation of scrap steel.

[0063] S2: Based on the running status of the AGC cylinder roller gap, determine whether the end time of the stroke has exceeded the time limit, and complete the timing of one automatic step response test of the cylinder;

[0064] Furthermore, based on the operating status of the AGC cylinder roller gap, it is determined whether the end time of the stroke has been exceeded, including:

[0065] After the automatic step response test of the hydraulic cylinder is started, the roll gap will perform downward and upward operations according to the given roll gap amount;

[0066] Timing is started at the moment of the roll gap pressing and lifting operation. Timing ends when 90% of the target value is reached. The timing end time is the response time of the automatic step response test of the hydraulic cylinder.

[0067] A warning alarm will be issued if the response time exceeds the standard time value.

[0068] Specifically, it also includes:

[0069] The first step of the automatic step response test: According to the given amount of step roll gap, the roll gap is automatically pressed down and moved. At the same time, the system automatically starts the timing of the first roll gap pressing. When the cylinder moves to 90% of the target stroke, the timing ends. At this time, the time consumed for the first roll gap pressing to reach 90% is obtained.

[0070] The second step of the automatic step response test: Two seconds after the first step of pressing down the roll gap, the roll gap recovery and lifting operation is automatically performed. That is, the original set roll gap is restored based on the first pressing down of the roll gap. The timing method for lifting the roll gap is the same as the timing method for pressing down the roll gap. The timing starts when the roll gap is given and ends immediately when the roll gap is lifted to 90% of the target value. At this time, the time consumed by the first lifting of the roll gap to 90% is obtained.

[0071] The timing process for an automatic step response test of the hydraulic cylinder is completed in two steps.

[0072] It should be noted that the position accuracy of the displacement sensor currently installed on the AGC cylinder is 1µm. Two sets of displacement sensors are symmetrically installed on both sides of a single AGC cylinder. The roll gap is the average value of the feedback from the two displacement sensors on the same cylinder, and the resulting roll gap is the center roll gap of the cylinder.

[0073] The automatic step response test involves the program instantaneously providing a step gap setpoint (e.g., a step setpoint of 50µm). At this point, the program determines the deviation between the setpoint and the feedback. Through a PI controller, the program outputs a current signal to the corresponding servo valve of the target cylinder. Upon receiving the current signal, the servo valve hydraulically drives the cylinder to move. Displacement sensors on both sides of the hydraulic cylinder detect the cylinder's stroke and feed it back to the control system. The ultimate goal is to control the cylinder's gap setpoint and feedback within ±2µm.

[0074] S3: Three-cycle test, calculate the average value of the test data and automatically compare it with the standard value to determine whether the hydraulic cylinder meets the response speed requirements;

[0075] Furthermore, this includes three cyclic tests. After all three step response tests are completed, the average of the three step response tests is taken as the final test time result.

[0076] Specifically, it also includes:

[0077] By comparing with the standard reference value for step response test time;

[0078] An alarm signal will be output if the final test time result is greater than the standard reference value.

[0079] When the final test time is not greater than the standard reference value, the hydraulic cylinder meets the response speed requirement and the test is completed.

[0080] It should be noted that in a hydraulic closed-loop control system, the system is relatively stable in a short period of time under the same operating conditions. The purpose of conducting three step tests without making any hardware changes is to improve the reliability of the data.

[0081] S4: Display the step response test results of each AGC cylinder on the screen and process the step response data.

[0082] Furthermore, the step response test results for each AGC cylinder are displayed on the screen, and step response data processing is performed, including:

[0083] The screen displays the results of the three most recent step response tests and the average value of the three test results;

[0084] If the result of the step response test exceeds the standard time, the displayed value will turn into a red warning to alert maintenance personnel.

[0085] If the value does not turn red, it means that the hydraulic cylinder has successfully passed the step response test standard.

[0086] The obtained automatic step response test results are processed according to requirements.

[0087] In this embodiment, the online automatic step response testing device for AGC cylinders in a hot rolling production line includes:

[0088] The control start module is used to interlock the start conditions of the automatic step response test of the hydraulic cylinder, control the timing of the online AGC hydraulic cylinder step response test, and start the automatic step response test of the hydraulic cylinder.

[0089] The roller gap operation module is used to determine whether the end time of the stroke has been exceeded based on the running status of the roller gap of the AGC cylinder, and to complete the timing of one automatic step response test of the cylinder.

[0090] The three-stage automatic step response test trigger module is used for three-cycle testing, calculates the average value of the test data and automatically compares it with the standard value to determine whether the hydraulic cylinder meets the response speed requirements.

[0091] The display module is used to display the step response test results of each AGC cylinder on the screen and to process the step response data.

[0092] This embodiment also provides a computing device applicable to the online automatic step response test method for AGC cylinders in hot rolling production lines, including:

[0093] The system includes a memory and a processor. The memory stores computer-executable instructions, and the processor executes these instructions to implement the online automatic step response test method for AGC cylinders in hot rolling production lines, as proposed in the above embodiments.

[0094] The computer device can be a terminal, comprising a processor, memory, communication interface, display screen, and input devices connected via a system bus. The processor provides computing and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, carrier networks, NFC (Near Field Communication), or other technologies. The display screen can be an LCD screen or an e-ink screen. The input devices can be a touch layer covering the display screen, buttons, a trackball, or a touchpad on the computer device's casing, or an external keyboard, touchpad, or mouse.

[0095] This embodiment also provides a storage medium storing a computer program that, when executed by a processor, implements the online automatic step response test method for AGC cylinders in hot rolling production lines as proposed in the above embodiments.

[0096] The storage medium proposed in this embodiment and the data storage method proposed in the above embodiments belong to the same inventive concept. Technical details not described in detail in this embodiment can be found in the above embodiments, and this embodiment has the same beneficial effects as the above embodiments.

[0097] Example 2

[0098] Reference Figures 2-3 This is one embodiment of the present invention, and the beneficial effects are verified through actual step tests.

[0099] The closed-loop control principle of the AGC servo system is analyzed and implemented using the CFC programming language of the Siemens TDC controller. When the start conditions of the automatic step response test are met, the cylinder step response test button on the screen is clicked to enter the automatic step response test phase.

[0100] The automatic step response test program instantaneously provides a step roll gap setpoint ranging from 50µm to 300µm for quality inspection, which is adjustable. In this embodiment, the step roll gap setpoint is 50µm, as shown in Table 1.

[0101] Table 1 Roll Gap Setpoint

[0102]

[0103] The results of the automatic step response test are shown in Table 2:

[0104] Table 2 Results Data

[0105]

[0106]

[0107] Combination Figure 2 As shown in Table 2, the automatic step response test results are all less than the standard time value of 90ms, and no alarm is triggered. If the result exceeds the 90ms threshold, the data will turn red and trigger an alarm to alert the operation and maintenance personnel. The operation and maintenance personnel can intuitively see the various parameters on the screen and adjust the parameters through the AGC cylinder PI parameter adjustment interface.

[0108] After each step response test is completed, the test data results are updated. At this time, it is not possible to archive the data from this step response test. Figure 3 As shown: After completing an automatic step response test, the final display values ​​that need to be archived are configured into the corresponding control through the archiving control, and the control's printing function is used to print and save them.

[0109] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for online automatic step response testing of AGC cylinders in a hot rolling production line, characterized in that, include: Interlock the start conditions of the automatic step response test of the hydraulic cylinder to control the timing of the online AGC hydraulic cylinder step response test and start the automatic step response test of the hydraulic cylinder. Based on the operating status of the AGC cylinder roller gap, determine whether the end time of the stroke has exceeded the time limit, and complete the timing of one automatic step response test of the cylinder. The test is repeated three times, the average value of the test data is calculated and automatically compared with the standard value to determine whether the hydraulic cylinder meets the response speed requirements; The step response test results of each AGC cylinder are displayed on the screen, and the step response data is processed. The start conditions for the automatic step response test of the hydraulic cylinder include: When the hydraulic condition is ready, the automatic step response test of the hydraulic cylinder is started, and the automatic step response test of the hydraulic cylinder is entered. When the hydraulic cylinder step response test button is clicked directly, the hydraulic cylinder automatic step response test will be started and the hydraulic cylinder automatic step response test phase will begin. When three cycles of step test are completed and the end time is reached, the current step test process ends and the automatic step response test of the hydraulic cylinder is no longer initiated. Based on the operating status of the AGC cylinder roller gap, determine whether the end time of the stroke has been exceeded, including: After the automatic step response test of the hydraulic cylinder is started, the roll gap will perform downward and upward operations according to the given roll gap amount; The timing is started at the moment of the roll gap pressing and lifting operation, and ends when 90% of the target value is reached. The time of ending the timing is the response time of the automatic step response test of the hydraulic cylinder. If the response time exceeds the standard time value, a warning alarm will be issued; The method further includes: The first step of the automatic step response test: According to the given amount of step roll gap, the roll gap is automatically pressed down and moved. At the same time, the system automatically starts the timing of the first roll gap pressing. When the cylinder moves to 90% of the target stroke, the timing ends. At this time, the time consumed for the first roll gap pressing to reach 90% is obtained. The second step of the automatic step response test: Two seconds after the roll gap is pressed down in the first step, the roll gap recovery and lifting operation is automatically performed. The original set roll gap is restored based on the first roll gap pressing down. The timing method for lifting the roll gap is the same as the timing method for pressing down the roll gap. When the roll gap is lifted to 90% of the target value, the timing is immediately stopped. At this time, the time consumed by the first roll gap lifting to 90% is obtained. After the first and second steps of the automatic step response test, the timing process of one automatic step response test of the hydraulic cylinder is completed. The test is repeated three times. After all three step response test processes are completed, the average value of the three step response tests is taken as the final test time result. The method further includes: By comparing with the standard reference value for step response test time; An alarm signal will be output if the final test time result is greater than the standard reference value. When the final test time is not greater than the standard reference value, the hydraulic cylinder meets the response speed requirement and the test is completed.

2. The method for online automatic step response testing of AGC cylinders in a hot rolling production line as described in claim 1, characterized in that, The system displays the step response test results for each AGC cylinder on the screen and performs step response data processing, including: The screen displays the results of the three most recent step response tests and the average of the three results; if the step response test result exceeds the standard time, the displayed value will turn into a red warning. Prompt maintenance personnel; If the value does not turn red, it means that the hydraulic cylinder has successfully passed the step response test standard. The obtained automatic step response test results are processed according to requirements.

3. An online automatic step response testing device for AGC cylinders in a hot rolling production line, employing the method described in any one of claims 1-2, characterized in that... include: The control start module is used to interlock the start conditions of the automatic step response test of the hydraulic cylinder, control the timing of the online AGC hydraulic cylinder step response test, and start the automatic step response test of the hydraulic cylinder. The roller gap operation module is used to determine whether the end time of the stroke has been exceeded based on the running status of the roller gap of the AGC cylinder, and to complete the timing of one automatic step response test of the cylinder. The three-stage automatic step response test trigger module is used to cycle the test three times, calculate the average value of the test data and automatically compare it with the standard value to determine whether the hydraulic cylinder meets the response speed requirements. The display module is used to display the step response test results of each AGC cylinder on the screen and to process the step response data.

4. A computing device, comprising: Memory and processor; The memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions. When the computer-executable instructions are executed by the processor, they implement the steps of the online automatic step response test method for AGC cylinders in hot rolling production lines according to any one of claims 1 to 2.

5. A computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the steps of the online automatic step response test method for AGC cylinders in a hot rolling production line as described in any one of claims 1 to 2.

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