Continuous casting machine vibration table position calibration method

Abstract

The invention belongs to the technical field of continuous casting machine automatic control, and particularly relates to a continuous casting machine vibration table position calibration method which is characterized in that the vibration table position calibration process is controlled through a configuration HMI human-machine interface, and a PLC control system is responsible for collecting displacement sensor signals, completing accurate control over a vibration table servo valve and achieving rapid calibration. The method has the beneficial effects that the reference position of the vibration table is quickly and accurately calibrated, so that the position precision of the vibration table is improved, the crystallizer can more accurately operate according to the set vibration parameters, the casting blank is effectively prevented from being bonded with the copper wall of the crystallizer in the solidification process, the surface quality of the casting blank is improved, and the production cost is reduced. Defects on the surface of the casting blank are avoided; and the production interruption and the adjustment time caused by inaccurate positions are reduced, so that the continuous casting machine can operate more stably and efficiently, the production efficiency is improved, and the production cost is reduced. And meanwhile, the downtime caused by sensor replacement or maintenance and the like is shortened.

Description

Technical Field

[0001] The invention belongs to the technical field of continuous casting machine automatic control, and in particular relates to a position calibration method for a vibration table of a continuous casting machine. Background Art

[0002] The vibrating table of a continuous casting machine uses a high-frequency, low-amplitude up-and-down vibration to induce negative slip in the mold, separating the mold wall from the billet shell. Molten steel cools in the mold, forming a shell of a certain thickness. Vibration then releases the mold and pulls the billet downward through a straightening machine. The high-frequency, low-amplitude up-and-down vibration with negative slip also heals adhesions and prevents breakout. Controlled by a programmable logic controller (PLC), a displacement sensor measures the vibration table's displacement in real time and feeds the data back to the PLC. The PLC compares the feedback displacement with the programmed process vibration curve and calculates the displacement deviation. Through high-speed data processing and logical operations, the PLC achieves precise sinusoidal and non-sinusoidal control of the vibration table's position. Displacement sensors play a key role in this control process. Due to variations in manufacturing and installation, as well as deformation and wear over long-term use, the actual position of the vibration table may deviate from its initial installation position. Regular calibration of the vibration table's position is a crucial measure to ensure proper equipment operation. Calibration can promptly detect and compensate for position deviations caused by sensor drift, equipment wear, and other factors, ensuring the equipment is always in good operating condition and improving production stability and billet quality. Existing calibration operations suffer from low accuracy and are time-consuming, leading to production interruptions and extended adjustment times, impacting the stable and efficient operation of continuous casting machines. Summary of the Invention

[0003] The purpose of the present invention is to provide a method for calibrating the position of a vibrating table of a continuous casting machine, overcome the shortcomings of the existing technology, quickly solve the problem of decreased position accuracy of the vibrating table due to deformation, wear, etc. after the vibrating table position sensor fails and is replaced, and ensure that the position accuracy of the vibrating table can meet production requirements; ensure that the installation position of the position sensor is accurate and the accuracy of the measurement data is improved; timely detect and compensate for position deviations, provide accurate information and guidance for equipment maintenance, facilitate maintenance personnel to take corresponding maintenance measures in a timely manner, and ensure that the continuous casting machine is always in good operating condition.

[0004] To achieve the above object, the present invention is implemented through the following technical solutions:

[0005] A method for calibrating the position of a continuous casting machine vibration table is described. The calibration process is controlled by configuring the HMI (human-machine interface). The PLC control system is responsible for collecting displacement sensor signals, completing precise control of the vibration table servo valve, and achieving rapid calibration. The specific steps are as follows:

[0006] 1) Configure the HMI human-machine interface: Complete the production of the reference position calibration start button and the vibration table rise start button on the HMI human-machine interface to make them easy to operate and identify, so that operators can perform corresponding operations according to actual needs;

[0007] 2) Activation of the calibration preparation function: In the PLC control system, a logic operation is programmed for the "vibration table up start button". When the button is clicked once on the HMI human-machine interface, the PLC can accurately receive the signal and activate the vibration table calibration preparation program;

[0008] 3) Start the vibration table upward: After the calibration preparation program is activated, the PLC controls the vibration table to start moving it upward until it reaches the maximum position. This maximum position is used as a reference for subsequent accurate position calibration and related parameter testing;

[0009] 4) Detect the opening pressure of the vibration table: During the upward movement of the vibration table, the opening pressure of the vibration table is detected to determine whether the hydraulic or mechanical system of the vibration table is working normally;

[0010] 5) Detect the vibration table position: After the vibration table reaches the maximum position, further determine whether the vibration position meets the vibration table position calibration conditions. Only when the vibration position accurately meets the calibration conditions can the next step of operation be carried out;

[0011] 6) Start the calibration program: When the vibration table position meets the calibration conditions, the "reference position calibration start button" is programmed with logic operations in the PLC control system. After clicking the button on the HMI human-machine interface, the PLC control system officially starts the calibration program.

[0012] 7) Editing the formula for calculating the reference position offset: Based on the process requirements of the continuous casting machine and the motion characteristics of the vibration table, edit the formula for calculating the reference position offset to provide a reference basis for the precise control of the vibration table;

[0013] 8) Actual position formula editing: The vibration table actual position calculation formula is used to calculate the actual position of the vibration table at different times based on the real-time measurement data of the displacement sensor, so as to compare and calibrate it with the reference position offset, thereby achieving precise control of the vibration table position;

[0014] 9) Vibration table descent: After completing the calculation formula of the reference position offset and the actual vibration position, control the vibration table to descend from the maximum position back to the initial position;

[0015] 10) Calibration completed: After the vibration table returns to its original position, the theoretical position data obtained according to the calculation formula is compared and analyzed with the position data obtained by actual measurement. After confirming that the data is correct, the calibration of the vibration table position of the entire continuous casting machine is completed.

[0016] Furthermore, in step 9), the descending speed of the vibration table is 8-10 mm / s, and the initial position is 0 mm.

[0017] Furthermore, the vibration table reaches a maximum position 50 mm to 80 mm above the initial position.

[0018] Furthermore, the opening pressure range of the vibration table in step 4) is 250-300 bar.

[0019] Furthermore, the vibration table position calibration condition in step 5) is that the vibration position stops moving within 5 seconds.

[0020] Furthermore, the reference position offset formula is JP2-JP1=JP3; wherein: JP1 is the upper elevation reference value of the vibration table; JP2 is the actual value of the vibration table position sensor; and JP3 is the reference position offset of the vibration table.

[0021] Furthermore, the actual vibration position calculation formula is as follows: JP2-JP3=P; where: P is the actual position of the vibration table; JP2 is the actual value of the vibration table position sensor; JP3 is the reference position offset of the vibration table.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1) By quickly and accurately calibrating the reference position offset of the vibration table, the position accuracy of the vibration table is improved, allowing the crystallizer to operate more accurately according to the set vibration parameters, thereby effectively preventing the billet from sticking to the copper wall of the crystallizer during the solidification process, reducing the billet drawing resistance, and thus improving the surface quality of the billet, avoiding defects on the billet surface, and ensuring the performance of the final rolled steel;

[0024] 2) By improving the position accuracy of the vibration table, production interruptions and adjustment time caused by inaccurate positioning are reduced, enabling the continuous casting machine to operate more stably and efficiently, improving production efficiency and reducing production costs. At the same time, the rapid reference position calibration function also shortens downtime caused by sensor replacement or maintenance, further improving the overall operating efficiency of the continuous casting equipment;

[0025] 3) It avoids various accidents caused by incorrect vibration table position calibration, such as steel leakage accidents, reduces safety risks in the production process, ensures the personal safety of operators and the normal operation of equipment, improves the safety factor of continuous casting machine production, and enhances production safety;

[0026] 4) The calibration method of the present invention is simple to operate, time-efficient, and inexpensive to implement, reducing the manpower, material, and time costs required for equipment maintenance. Furthermore, accurate position calibration helps promptly identify potential equipment problems, facilitating maintenance and repairs in advance, thus avoiding further losses caused by equipment failures, extending the equipment's service life, and thus reducing the equipment's overall lifecycle costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a logic diagram of the position calibration control of the vibrating table of the continuous casting machine according to an embodiment of the present invention;

[0028] Figure 2 1. It is a schematic diagram of position parameters of the vibrating table of the continuous casting machine according to an embodiment of the present invention;

[0029] In the figure: 1-vibration table base, 2-hydraulic cylinder, 3-position sensor, 4-vibration table. DETAILED DESCRIPTION

[0030] The technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0031] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the specific embodiments required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the specific embodiments described below are some implementation methods of the present invention. For ordinary technicians in this field, other specific embodiments can be obtained based on these specific embodiments without paying any creative work.

[0032] The components of the embodiments of the present invention generally described and shown in the specific embodiments herein can be arranged and designed in countless different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the specific embodiments is not intended to limit the scope of the claimed invention, but is merely representative of selected embodiments of the present invention.

[0033] See Figure 1-2 , is a schematic diagram of an embodiment of a method for calibrating the position of a continuous casting machine vibration table according to the present invention. Taking the vibration table system of the No. 6 casting machine of Benxi Steel Plant as an example, the vibration table position calibration process is controlled by configuring the HMI human-machine interface. The PLC control system is responsible for collecting displacement sensor signals, completing precise control of the vibration table servo valve, and realizing rapid calibration. The specific operation steps are as follows:

[0034] 1) Configure the HMI: Create the reference position calibration start button and the shaker rise start button on the HMI. Configure them using Intouch software, setting DB200.DBX74.1 as the shaker rise start button variable and DB200.DBX72.5 as the shaker reference position calibration start button variable. This completes the configuration of the reference position calibration start button and the shaker rise start button. This step provides the foundation for subsequent operation of the shaker through the HMI. Operators can intuitively trigger different functions by clicking the corresponding buttons, making it easy to operate and identify, and convenient for operators to perform corresponding operations according to actual needs.

[0035] 2) Activate the calibration preparation function: In the PLC control system, program logic operations for the "vibration table up start button". When the button is clicked once on the HMI human-machine interface, the PLC can accurately receive the signal and activate the vibration table calibration preparation program. Activating this function prepares the vibration table for a series of subsequent actions and testing operations, ensuring that the entire calibration process can proceed in an orderly manner.

[0036] 3) Start the vibration table upward: After the calibration preparation program is activated, the servo valve opening is set to 10%. The PLC controls the vibration table to start moving it upward until it reaches its maximum position. This maximum position is used as a reference for subsequent accurate position calibration and related parameter testing. During this process, the servo valve opening must be precisely controlled to ensure that the vibration table can smoothly rise to the specified position, providing accurate starting conditions for subsequent calibration.

[0037] 4) Detect the opening pressure of the vibration table: During the upward movement of the vibration table, detect whether its opening pressure is greater than 250 bar. At the same time, the opening pressure of the vibration table is tested to determine whether the hydraulic or mechanical system of the vibration table is working normally. The opening pressure of the vibration table is an important parameter reflecting its working status. Only when the pressure reaches the set value can it be ensured that the performance of the vibration table meets the calibration requirements and the accuracy of the calibration results is guaranteed;

[0038] 5) Check the vibration table position: After the vibration table reaches the maximum position, further determine whether the vibration position meets the vibration table position calibration conditions. Check whether the vibration position stops within 5 seconds to determine whether the vibration table has reached a stable state and meets the vibration table position calibration conditions. Only when the vibration position accurately meets the calibration conditions can the next step be performed. This step is to ensure that the vibration table position is stable during the calibration operation to avoid deviations in the calibration results due to unstable position.

[0039] 6) Start the calibration procedure: When the vibration table position meets the calibration conditions, perform a programming logic operation on the "reference position calibration start button" in the PLC control system. After clicking the button on the HMI human-machine interface, the PLC control system will activate the vibration table calibration function and officially start the calibration procedure;

[0040] 7) Editing the formula for the reference position offset: Based on the process requirements of the continuous casting machine and the motion characteristics of the vibration table, edit the formula for calculating the reference position to provide a reference basis for the precise control of the vibration table; the formula for calculating the reference position offset is as follows:

[0041] JP2-JP1=JP3 formula (1);

[0042] In formula (1), JP1 is the reference value of the upper elevation of the vibration table, which is 50 mm in the embodiment; JP2 is the actual value of the vibration table position sensor; JP3 is the reference position offset of the vibration table. According to the given reference position offset calculation formula (1), the reference position offset of the vibration table can be accurately determined, providing a reference basis for subsequent precise control;

[0043] 8) The actual position formula of the vibration table is used to calculate the actual position of the vibration table at different times based on the real-time measurement data of the vibration table position sensor, so as to perform subtraction operation with the reference position offset to obtain the actual position of the vibration table, thereby achieving precise control of the vibration table position closed loop; the actual position calculation formula (2) is as follows:

[0044] JP2-JP3=P formula (2);

[0045] In formula (2), P is the actual position of the vibration table. JP2 is the actual value of the vibration table position sensor. JP3 is the offset of the vibration table reference position.

[0046] 9) Vibration table descent: After completing the calculation formula for the reference position offset and the actual vibration position, the vibration table is slowly lowered from its current position until it returns to its original position. During the descent process, the speed and position must be precisely controlled to ensure that the vibration table can return to its original position smoothly and accurately, avoiding impact on the equipment or impact on the calibration results due to excessive descent speed or inaccurate position control. Generally, the descent speed and control stop position are adjusted in real time by the PLC control system based on preset parameters and sensor feedback information;

[0047] 10) Calibration Complete: After the vibration table returns to its original position, compare and analyze the theoretical position data calculated based on the calculation formula with the actual measured position data. Once the data is confirmed to be correct, the calibration of the entire continuous casting machine vibration table position is completed. Analyze whether the calculated vibration table reference position data meets expectations and is within a reasonable error range. Compare the actual measured and calculated reference positions with the equipment's designed reference position or the reference position data from previous normal operation. If the deviation is excessive, it is necessary to investigate the cause, which may be an error in the measurement process or a problem with the equipment itself.

[0048] Generally speaking, the error in calibration data should be within the equipment's allowable accuracy. This tolerance may vary for different continuous casting machine vibrating tables, typically determined based on the equipment's manufacturing precision, process requirements, and previous operating experience. Once the calibration data is confirmed to be correct, the continuous casting machine vibrating table position calibration is complete. This provides the foundation for accurate position control during subsequent continuous casting operations, ensuring billet quality and production efficiency.

[0049] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A method for calibrating the position of a continuous casting machine vibration table, characterized in that: The vibration table position calibration process is controlled by configuring the HMI human-machine interface. The PLC control system is responsible for collecting the displacement sensor signal, completing the precise control of the vibration table servo valve, and achieving rapid calibration. The specific operation steps are as follows: 1) Configure the HMI human-machine interface: Complete the production of the reference position calibration start button and the vibration table rise start button on the HMI human-machine interface to make them easy to operate and identify, so that operators can perform corresponding operations according to actual needs; 2) Activate the calibration preparation function: In the PLC control system, program logic operations for the "vibration table up start button". When the button is clicked once on the HMI human-machine interface, the PLC can accurately receive the signal and activate the vibration table calibration preparation program; 3) Start the vibration table upward: After the calibration preparation program is activated, the PLC controls the vibration table to start moving it upward until it reaches the maximum position. This maximum position is used as a reference for subsequent accurate position calibration and related parameter testing; 4) Detect the opening pressure of the vibration table: During the upward movement of the vibration table, the opening pressure of the vibration table is detected to determine whether the hydraulic or mechanical system of the vibration table is working normally; 5) Detect the vibration table position: After the vibration table reaches the maximum position, further determine whether the vibration position meets the vibration table position calibration conditions. Only when the vibration position accurately meets the calibration conditions can the next step of operation be carried out; 6) Start the calibration procedure: When the vibration table position meets the calibration conditions, the "reference position calibration start button" is programmed with logic operations in the PLC control system. After clicking the button on the HMI human-machine interface, the PLC control system officially starts the calibration procedure. 7) Editing the formula for calculating the reference position offset: Based on the process requirements of the continuous casting machine and the motion characteristics of the vibration table, edit the formula for calculating the reference position offset to provide a reference basis for the precise control of the vibration table; 8) Actual position formula editing: The vibration table actual position calculation formula is used to calculate the actual position of the vibration table at different times based on the real-time measurement data of the displacement sensor, so as to compare and calibrate it with the reference position offset, thereby achieving precise control of the vibration table position; 9) Vibration table descent: After completing the calculation formula of the reference position offset and the actual vibration position, control the vibration table to descend from the maximum position back to the initial position; 10) Calibration completed: After the vibration table returns to its original position, the theoretical position data obtained according to the calculation formula is compared and analyzed with the position data obtained by actual measurement. After confirming that the data is correct, the calibration of the vibration table position of the entire continuous casting machine is completed.

2. A method for calibrating the position of a continuous casting machine vibration table according to claim 1, characterized in that: In step 9), the vibration table descends at a speed of 8-10 mm / s, and the initial position is 0 mm.

3. The method for calibrating the position of a continuous casting machine vibration table according to claim 1, characterized in that: The vibration table reaches a maximum position 50 mm to 80 mm above the initial position.

4. The method for calibrating the position of a continuous casting machine vibration table according to claim 1, characterized in that: The opening pressure range of the vibration table in step 4) is 250-300 bar.

5. The method for calibrating the position of a continuous casting machine vibration table according to claim 1, characterized in that: The condition for calibrating the vibration table position in step 5) is that the vibration position stops moving within 5 seconds.

6. A method for calibrating the position of a continuous casting machine vibration table according to claim 1, characterized in that: The formula for the reference position offset is JP2-JP1=JP3; where JP1 is the upper elevation reference value of the vibration table; JP2 is the actual value of the vibration table position sensor; and JP3 is the reference position offset of the vibration table.

7. The method for calibrating the position of a continuous casting machine vibration table according to claim 1, characterized in that: The actual vibration position calculation formula is as follows: JP2-JP3=P; where: P is the actual position of the vibration table; JP2 is the actual value of the vibration table position sensor; JP3 is the reference position offset of the vibration table.

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