Device for synchronously controlling withdrawal and straightening machine and dummy bar

Abstract

The utility model discloses a device for synchronously controlling a withdrawal and straightening machine and a dummy bar of a continuous casting machine. The device comprises a potentiometer, a PLC (Programmable Logic Controller) control system, a signal isolation module, a withdrawal and straightening machine frequency converter, a dummy bar frequency converter and a digital display instrument. The potentiometer is connected to an analog quantity input port of the PLC control system through the one-input one-output optoelectronic isolator and is used for inputting an initial control signal; the output end of the PLC control system is connected with the withdrawal and straightening machine frequency converter and the dummy bar frequency converter to drive the two frequency converters to operate. A feedback signal of the withdrawal and straightening machine frequency converter is divided into two paths to be transmitted to the PLC control system and the withdrawal and straightening machine digital display instrument through the one-input two-output isolator, and a feedback signal of the dummy bar frequency converter is directly accessed to the dummy bar digital display instrument. The device eliminates electromagnetic interference through a photoelectric isolation module, integrates a water distribution model and a molten steel temperature data interface, adopts a standardized interface design for hardware, is adaptive to different continuous casting machine models, has the characteristics of strong anti-interference capability, stable signal transmission and visual real-time monitoring, and effectively improves the operation reliability of equipment.

Description

Technical Field

[0001] This utility model relates to the field of automation control technology for metallurgical continuous casting equipment, specifically a device for synchronous control of a straightening machine and a dummy bar. Background Technology

[0002] As the core equipment in the continuous casting process of the metallurgical industry, the coordinated operation of the straightening machine and the dummy bar is crucial to ensuring safety and efficiency during the initial casting stage. The straightening machine provides the power for casting and straightens the billet, while the dummy bar is used to seal the bottom of the crystallizer and guide the billet into shape. In existing technologies, the dummy bar mostly adopts an independent control system or direct control via frequency converter, which has significant drawbacks: First, the independent system lacks real-time data interaction, making it difficult to dynamically match the speed ratio between the straightening machine and the dummy bar. When the casting speed or molten steel temperature fluctuates, it is easy to cause the action to become disconnected. Second, the direct control via potentiometer or frequency converter has weak anti-interference capability, and signal distortion may cause the dummy bar to lag (such as the steel leakage accident caused by signal interference in a steel plant). Third, without dynamically adjusting the dummy bar speed in conjunction with process parameters such as water distribution model and molten steel temperature, it is easy to deviate from the normal operation when the billet solidification speed changes. Fourth, operators cannot monitor the matching status of casting speed and recovery speed in real time, resulting in delayed fault response. While recent improvements have attempted to increase sensors or optimize parameters, issues remain, such as unfiltered sensor signals, lack of fuzzy logic integration in control algorithms, and low integration of monitoring interfaces. Therefore, a solution with high-precision synchronous control, strong anti-interference capabilities, and real-time monitoring is urgently needed to reduce the risk of steel leakage and improve equipment reliability. Utility Model Content

[0003] The purpose of this invention is to provide a device for synchronous control of the straightening machine and the dummy bar, so as to ensure that the straightening machine and the dummy bar move synchronously when the continuous casting machine starts casting, thereby reducing the risk of steel leakage and equipment failure.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A device for synchronous control of a tension leveling machine and a guide bar, comprising:

[0006] The PLC control system includes an input terminal, a first output terminal, and a second output terminal. Its input terminal is connected to the output terminal of a one-input-one-output signal isolator, its first output terminal is connected to the control terminal of the frequency converter of the tension leveler, and its second output terminal is connected to the control terminal of the frequency converter of the derrick.

[0007] A potentiometer, the output of which is connected to the input of the one-input-one-output signal isolator, is used to input the initial control signal of the tension straightening machine;

[0008] The frequency converter of the tension straightening machine has its feedback terminal connected to the input terminal of a one-input two-output signal isolator.

[0009] A one-input, two-output signal isolator, whose first output terminal is connected to the feedback signal input terminal of the PLC control system, and whose second output terminal is connected to the input terminal of the digital display of the tension leveling machine;

[0010] The frequency converter for the derrick has its feedback terminal connected to the input terminal of the derrick digital display instrument.

[0011] The digital display of the tension leveler and the digital display of the derrick are used to display the tension speed of the tension leveler and the recovery speed of the derrick in real time, respectively.

[0012] Furthermore, the potentiometer, the one-input-one-output signal isolator, the PLC control system, the tension leveling machine frequency converter, the one-input-two-output signal isolator, and the tension leveling machine digital display are connected to form the tension leveling machine control loop.

[0013] Furthermore, the potentiometer, the one-in-one-out signal isolator, the PLC control system, the spindle rod frequency converter, and the spindle rod digital display are connected to form a spindle rod control loop.

[0014] Furthermore, the one-input-one-output signal isolator and the one-input-two-output signal isolator are opto-isolators used to eliminate electrical interference between control signals and feedback signals.

[0015] Furthermore, the digital display of the tension leveler and the digital display of the guide bar are digital displays that are directly electrically connected to the feedback terminal of the strain frequency converter.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. Significantly enhanced anti-interference capability: The use of one-input-one-output signal isolators and one-input-two-output signal isolators as opto-isolation devices effectively eliminates the negative impact of on-site electromagnetic interference on control signals, ensuring that the PLC control system receives the straightening machine operating frequency signal and outputs the spindle control signal.

[0018] 2. Enhanced real-time monitoring function: Through the integrated setup of the digital display of the straightening machine and the digital display of the dummy bar, operators can directly observe the real-time matching status of the straightening machine's pulling speed and the dummy bar's recovery speed, avoiding misjudgments or operational delays caused by information lag.

[0019] 3. Improved system integration: The PLC control system in the device is directly connected to the water distribution model data interface and the molten steel temperature sensor, realizing centralized processing of multi-source signals and reducing synchronization errors caused by signal dispersion in traditional independent systems.

[0020] 4. Hardware compatibility optimization: The frequency converters for the straightening machine and the dummy bar adopt standardized interface designs, which can be adapted to different models of continuous casting machines, reducing on-site modification and maintenance costs. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the present invention;

[0022] In the diagram, 1-potentiometer; 2-PLC control system; 3-one-input-one-output signal isolator; 4-straightening machine frequency converter; 5-one-input-two-output signal isolator; 6-straightening machine digital display; 7-spindle rod frequency converter; 8-spindle rod digital display. Detailed Implementation

[0023] The technical solution of this utility model will be further described below with reference to the accompanying drawings.

[0024] like Figure 1 As shown, a device for synchronous control of a tension leveler and a guide bar includes:

[0025] PLC control system 2, the PLC control system 2 is selected from Siemens S7-1500 series, which includes an input terminal, a first output terminal and a second output terminal. Its input terminal is connected to the output terminal of the one-in-one-out signal isolator 3, its first output terminal is connected to the control terminal of the tension leveling machine frequency converter 4, and its second output terminal is connected to the control terminal of the derrick frequency converter 7.

[0026] Potentiometer 1, whose output terminal is connected to the input terminal of the one-input-one-output signal isolator 3, is used to input the initial control signal of the tension straightening machine;

[0027] The frequency converter 4 of the tension straightening machine is selected from the ABB ACS880 series, and its feedback terminal is connected to the input terminal of the one-input two-output signal isolator 5.

[0028] The one-input two-output signal isolator 5 has its first output terminal connected to the feedback signal input terminal of the PLC control system 2, and its second output terminal connected to the input terminal of the tension leveling machine digital display 6.

[0029] The frequency converter 7 for the derrick is selected from the ABB ACS880 series, and its feedback terminal is connected to the input terminal of the derrick digital display instrument 8.

[0030] The digital display 6 for the straightening machine and the digital display 8 for the dummy bar are used to display the straightening machine's pulling speed and the dummy bar's recovery speed in real time, respectively. In the figure, HZ on the digital display 6 for the straightening machine and the digital display 8 for the dummy bar represents the operating frequency.

[0031] The one-input-one-output signal isolator 3 and the one-input-two-output signal isolator 5 are opto-isolators used to eliminate electrical interference between control signals and feedback signals. The digital display instrument 6 for the tension leveler and the digital display instrument 8 for the traction rod are digital displays that are directly electrically connected to the feedback terminal of the corresponding strain frequency converter.

[0032] Potentiometer 1, one-input-one-output signal isolator 3, PLC control system 2, tension leveling machine frequency converter 4, one-input-two-output signal isolator 5, and tension leveling machine digital display 6 are connected to form the tension leveling machine control loop. Potentiometer 1, one-input-one-output signal isolator 3, PLC control system 2, dart rod frequency converter 7, and dart rod digital display 8 are connected to form the dart rod control loop.

[0033] A device for synchronous control of a straightening machine and a dummy bar is disclosed. Its control principle is as follows: When the continuous casting machine starts pouring, the operator outputs a frequency converter control signal via potentiometer 1, which passes through a one-input-one-output signal isolator 3 and a PLC control system 2 to control the straightening machine's frequency converter 4. The PLC control system 2 filters the input signal to ensure relative stability of the data operation. Simultaneously with the straightening machine's startup, it feeds back the operating frequency signal to a one-input-two-output signal isolator 5. After signal isolation, the isolator splits the signal into two paths: one path is fed back to the PLC control system 2, and the other path is fed back to the straightening machine's digital display 6, used to display the straightening machine's pulling speed on-site, allowing the operator to monitor the equipment's operating status. The straightening machine's operating frequency signal fed back to the PLC control system 2 is synchronously judged with signals such as the continuous casting machine's water distribution model and molten steel temperature. One-dimensional fuzzy control is adopted, and combined with the on-site environment and on-the-job experience, the frequency revision coefficient of the dummy bar is synchronously and dynamically determined. After the straightening machine's operating frequency signal is multiplied by the revision coefficient, it is output by the PLC control system 2 to control the dummy bar frequency converter 7. At the same time, the dummy bar frequency converter 7 feeds back the operating frequency signal to the dummy bar digital display instrument 8, which is used to display the dummy bar recovery speed on-site, so that the on-the-job personnel can grasp the equipment's operating status. This process realizes the synchronous control of the straightening machine and the dummy bar when the continuous casting machine starts pouring, which greatly improves the safety and stability of the continuous casting machine's operation.

Claims

1. A device for synchronous control of a tension leveling machine and a guide bar, characterized in that, include: The PLC control system (2) includes an input terminal, a first output terminal and a second output terminal. Its input terminal is connected to the output terminal of the one-in-one-out signal isolator (3), its first output terminal is connected to the control terminal of the tension straightener frequency converter (4), and its second output terminal is connected to the control terminal of the derrick frequency converter (7). Potentiometer (1), whose output terminal is connected to the input terminal of the one-input-one-output signal isolator (3), is used to input the initial control signal of the tension straightening machine; The frequency converter (4) of the tension straightening machine has its feedback terminal connected to the input terminal of the one-input two-output signal isolator (5); The signal isolator (5) with one input and two outputs has its first output terminal connected to the feedback signal input terminal of the PLC control system (2) and its second output terminal connected to the input terminal of the digital display instrument (6) of the tension straightening machine. The frequency converter (7) for the derrick rod has its feedback end connected to the input end of the derrick rod digital display (8); The digital display instrument (6) for the straightening machine and the digital display instrument (8) for the derrick are used to display the straightening machine's pulling speed and the derrick's recovery speed in real time, respectively.

2. The device for synchronous control of a tension leveling machine and a guide bar according to claim 1, characterized in that, The potentiometer (1), one-input-one-output signal isolator (3), PLC control system (2), tension straightening machine frequency converter (4), one-input-two-output signal isolator (5), and tension straightening machine digital display (6) are connected to form the tension straightening machine control loop.

3. The device for synchronous control of a tension leveling machine and a guide bar according to claim 2, characterized in that, The potentiometer (1), the one-in-one-out signal isolator (3), the PLC control system (2), the derrick frequency converter (7), and the derrick digital display (8) are connected to form the derrick control loop.

4. The device for synchronous control of a tension leveling machine and a guide bar according to claim 3, characterized in that, The one-input-one-output signal isolator (3) and the one-input-two-output signal isolator (5) are opto-isolators used to eliminate electrical interference between control signals and feedback signals.

5. The device for synchronous control of a tension leveler and a guide bar according to claim 4, characterized in that, The digital display instrument (6) of the tension straightening machine and the digital display instrument (8) of the guide bar are digital displays that are directly electrically connected to the feedback end of the strain frequency converter.

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