An automatic liquid level control device for a tundish

Abstract

The utility model belongs to the continuous casting production technical field, disclose a kind of continuous casting tundish liquid level automatic control device, including tundish weight weighing system, big ladle slag detection system, infrared auxiliary measurement system, control PLC and model, control execution unit and operation instruction unit.Tundish weight weighing system is accurately measured tundish weight by 4 sets of symmetrical distribution weighing head in combination with heat-proof and impact-proof device;Infrared auxiliary measurement system detects molten steel surface height in real time and corrects liquid level control model;Tundish volume calculation module and liquid level control module in control PLC and model, in combination with the control instruction generated by starting and finishing control model;Control execution unit drives big ladle slide gate mechanism to adjust steel flow;Operation instruction unit displays data in real time and supports manual intervention.The device realizes the accurate control of tundish liquid level automatically, improves the stability of continuous casting production and the quality of casting blank, solves the problem of low precision and high labor intensity of manual control.

Description

Technical Field

[0001] This utility model belongs to the field of steelmaking continuous casting production technology, and in particular relates to an automatic control device for liquid level in a ladle. Background Technology

[0002] In continuous casting production, stable control of the molten steel level in the tundish is crucial for ensuring billet quality and improving production efficiency. Traditional tundish level control largely relies on manual operation. Operators need to constantly observe the molten steel level and manually adjust the ladle nozzle opening. This method is not only labor-intensive but also lacks precision, easily influenced by operator experience and subjective factors, making it difficult to achieve accurate and stable tundish level control. Furthermore, during the initial and final stages of tundish pouring, the complex changes in molten steel flow and level make manual control even more challenging, easily leading to quality problems such as inclusions and cracks in the billets, affecting product quality and production continuity. With the increasing automation of continuous casting production, there is an urgent need for a device capable of automatically and accurately controlling the molten steel level in the tundish. Utility Model Content

[0003] Therefore, the purpose of this utility model is to provide an automatic control device for the liquid level in the tundish, so as to realize automatic and precise control of the liquid level in the tundish, and improve the stability of continuous casting production and the quality of the cast billet.

[0004] To achieve the aforementioned objectives of this utility model, the technical solution adopted is as follows: An automatic control device for liquid level in a continuous casting ladle includes: The intermediate bag weight weighing system includes a weighing head, a heat and shock protection device, an electronic weighing device, a digital display device, and a weighing module plate. The weighing head is installed at the bottom of the intermediate bag vehicle through the heat and shock protection device, and the weighing module plate is electrically connected to the electronic weighing device. The slag discharge detection system for the large bag includes a slag discharge detection sensor, a dedicated measuring cable, a preamplifier, and a central processing unit. The slag discharge detection sensor is installed on the reference plate of the large bag nozzle mechanism and is connected to the preamplifier through the dedicated measuring cable. An infrared-assisted measurement system includes an infrared position measuring probe and an infrared measurement conversion device. The infrared position measuring probe is positioned above the intermediate package and outputs a liquid level signal through the infrared measurement conversion device. The control PLC and model include a ladle casting flow control PLC, an operator station, a middle ladle volume calculation module, and a middle ladle liquid level control module. The ladle casting flow control PLC is electrically connected to the weighing module plate, the central processing unit, and the infrared measurement conversion device, respectively. The control execution unit includes a drive conversion module board, a servo control module, and a ladle sliding gate mechanism. The input end of the drive conversion module board is connected to the ladle casting flow control PLC, and the output end is connected to the servo control module. The servo control module drives the ladle sliding gate mechanism. The operation instruction unit includes a large screen display and a field operation instruction box. The large screen display communicates with the ladle casting flow control PLC via a ProfiBUS bus, and the field operation instruction box is connected to the ladle casting flow control PLC via signals.

[0005] As a further improvement of this utility model, the intermediate bag weight weighing system includes 4 sets of weighing heads, symmetrically distributed at the four corners of the intermediate bag vehicle, and the weighing module plate performs the tare operation according to the intermediate bag vehicle's arrival signal.

[0006] As a further improvement of this utility model, the slag detection sensor of the slag detection system is an electromagnetic induction coil, and the central processing unit outputs a control signal or alarm signal to close the slag outlet mechanism when it detects that the slag content exceeds the threshold.

[0007] As a further improvement of this utility model, the infrared position measurement probe of the infrared auxiliary measurement system detects the surface height of the molten steel in the ladle in real time, and the infrared measurement conversion device transmits the liquid level parameters to the ladle casting flow control PLC as a correction factor for the ladle liquid level control model.

[0008] As a further improvement of this utility model, the tundish volume calculation module of the ladle casting flow control PLC calculates the molten steel level height in real time based on the ladle weight, ladle car position and billet pulling speed; the ladle level control module generates control commands according to the set liquid level height, ladle nozzle opening-steel flow model and tundish volume data.

[0009] As a further improvement of this utility model, the tundish liquid level control module is equipped with an opening control model and an closing control model, which are used for liquid level stability control during the opening stage of the first furnace and the closing stage of the last furnace in tundish casting, respectively.

[0010] As a further improvement of this utility model, the servo control module of the control execution unit is an electric or hydraulic servo mechanism, and the drive conversion module board converts the digital signal output by the ladle casting flow control PLC into the drive current or hydraulic command of the servo control module.

[0011] As a further improvement of this utility model, the large screen display of the operation instruction unit displays the weight of molten steel in the ladle, the weight of molten steel in the tundish, and the liquid level height in the tundish in real time; the on-site operation instruction box is set at the ladle pouring position for manually inputting the liquid level setting value and switching the control mode.

[0012] The beneficial effects of this invention are as follows: This invention, through the four symmetrically distributed weighing heads of the tundish weight weighing system, combined with real-time detection by the infrared auxiliary measurement system, can accurately acquire the weight and liquid level information of the molten steel in the tundish, providing accurate data support for liquid level control. The tundish liquid level control module is equipped with an opening control model and an ending control model, which can perform specialized liquid level stability control for different production stages (opening stage and ending stage). Simultaneously, it can generate control commands based on the set liquid level height, ladle nozzle opening-steel flow model, and tundish volume data, adapting to different production conditions. Attached Figure Description

[0013] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings: Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] In the diagram: 1. Tundish weight weighing system; 11. Weighing head; 12. Heat and shock protection device; 13. Electronic weighing device; 14. Digital display device; 15. Weighing module board; 2. Ladle slag detection system; 21. Slag detection sensor; 22. Dedicated measuring cable; 23. Preamplifier; 24. Central processing unit; 3. Infrared auxiliary measurement system; 31. Infrared position measurement probe; 32. Infrared measurement conversion device; 4. Control PLC and model; 41. Ladle casting flow control PLC; 42. Operator station; 43. Tundish volume calculation module; 44. Tundish liquid level control module; 45. Start-up control model; 46. Finish-up control model; 5. Control execution unit; 51. Drive conversion module board; 52. Servo control module; 53. Ladle sliding gate mechanism; 6. Operation indication unit; 61. Large screen display; 62. On-site operation indication box. Detailed Implementation

[0015] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0016] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0017] like Figure 1 As shown, an automatic control device for liquid level in a continuous casting ladle includes: The intermediate bag weighing system 1 includes a weighing head 11, a heat- and shock-resistant device 12, an electronic weighing device 13, a digital display device 14, and a weighing module plate 15. The weighing head 11 is installed at the bottom of the intermediate bag vehicle via the heat- and shock-resistant device 12, and the weighing module plate 15 is electrically connected to the electronic weighing device 13. Further, the intermediate bag weighing system 1 includes four sets of weighing heads 11, symmetrically distributed at the four corners of the intermediate bag vehicle. The weighing module plate 15 performs a tare operation based on the intermediate bag vehicle's arrival signal. This arrangement enables more accurate measurement of the intermediate bag weight. Through symmetrical distribution and the tare operation, interference from factors such as the weight of the intermediate bag vehicle itself is eliminated, improving measurement accuracy.

[0018] The ladle slag detection system 2 includes a slag detection sensor 21, a dedicated measuring cable 22, a preamplifier 23, and a central processing unit 24. The slag detection sensor 21 is installed on the ladle nozzle reference plate and connected to the preamplifier 23 via the dedicated measuring cable 22. The slag detection sensor 21 in the ladle slag detection system 2 is an electromagnetic induction coil. When the central processing unit 24 detects that the slag content exceeds a threshold, it outputs a control signal or alarm signal to shut down the ladle nozzle mechanism. By using an electromagnetic induction coil to detect slag discharge from the ladle, the system can promptly detect slag contamination. Through the control of the central processing unit 24, it effectively prevents slag from entering the ladle and affecting the quality of the cast billet.

[0019] Infrared auxiliary measurement system 3 includes an infrared position measuring probe 31 and an infrared measurement conversion device 32. The infrared position measuring probe 31 is positioned above the tundish, and the infrared measurement conversion device 32 outputs a liquid level signal. The infrared position measuring probe 31 of the infrared auxiliary measurement system 3 detects the surface height of the molten steel in the tundish in real time, and the infrared measurement conversion device 32 transmits the liquid level parameters to the ladle casting flow control PLC 41 as a correction factor for the tundish liquid level control model. The infrared auxiliary measurement system 3 can detect the surface height of the molten steel in the tundish in real time and accurately, providing more precise data for tundish liquid level control. By using the liquid level parameters as a correction factor, the control model becomes more accurate and reliable.

[0020] Control PLC and Model 4: Includes a ladle casting flow control PLC 41, an operator station 42, a tundish volume calculation module 43, and a tundish level control module 44. The ladle casting flow control PLC 41 is electrically connected to the weighing module plate 15, the central processing unit 24, and the infrared measurement conversion device 32. The tundish volume calculation module 43 of the ladle casting flow control PLC 41 calculates the molten steel level in real time based on the tundish weight, the tundish car position, and the billet pulling speed. The tundish level control module 44 generates control commands based on the set level height, the ladle nozzle opening-steel flow model, and the tundish volume data. In addition, the tundish level control module 44 is equipped with an opening control model 45 and a closing control model 46, which are used for level stabilization control during the first heat opening stage and the last heat closing stage of tundish casting, respectively. By using the PLC41 for ladle casting flow control and related models, intelligent calculation and control of the tundish liquid level are achieved. The setting of the start-up control model 45 and the finish-up control model 46 solves the problem of unstable control of the tundish liquid level in special stages.

[0021] The control execution unit 5 includes a drive conversion module 51, a servo control module 52, and a ladle sliding gate mechanism 53. The input end of the drive conversion module 51 is connected to the ladle casting flow control PLC 41, and the output end is connected to the servo control module 52. The servo control module 52 drives the ladle sliding gate mechanism 53. The servo control module 52 of the control execution unit 5 is an electric or hydraulic servo mechanism. The drive conversion module 51 converts the digital signals output by the ladle casting flow control PLC 41 into drive current or hydraulic commands for the servo control module 52. The control execution unit 5 can accurately execute the control commands issued by the ladle casting flow control PLC 41, and by driving the ladle sliding gate mechanism 53, it achieves precise adjustment of the molten steel flow rate, thereby controlling the ladle liquid level height.

[0022] Operation Instruction Unit 6 includes a large-screen display 61 and a field operation instruction box 62. The large-screen display 61 communicates with the ladle casting flow control PLC 41 via a ProfiBUS bus, and the field operation instruction box 62 is connected to the ladle casting flow control PLC 41 via signal connection. The large-screen display 61 of Operation Instruction Unit 6 displays the ladle steel weight, tundish steel weight, and tundish liquid level in real time. The field operation instruction box 62 is located at the ladle pouring position and is used for manually inputting liquid level setpoints and switching control modes. Operation Instruction Unit 6 allows operators to understand production data in real time and to manually intervene and switch control modes according to actual conditions, improving the operational flexibility and practicality of the equipment.

[0023] Working principle: In actual use, the intermediate ladle is first transported to the location by the intermediate ladle vehicle. The weighing module plate 15 of the intermediate ladle weight weighing system 1 performs the tare operation according to the arrival signal of the intermediate ladle vehicle. The four sets of weighing pressure heads 11 symmetrically distributed at the four corners of the intermediate ladle vehicle start to accurately measure the weight of the intermediate ladle and transmit the weight signal to the electronic weighing device 13. After processing, it is transmitted to the ladle casting flow control PLC 41 through the weighing module plate 15.

[0024] The electromagnetic induction coil of the large bag slag detection system 2 is installed on the reference plate of the large bag nozzle mechanism to detect the slag discharge in real time. When the slag content exceeds the threshold, the signal is transmitted to the preamplifier 23 through the dedicated measuring cable 22, and then transmitted to the central processing unit 24 by the preamplifier 23. The central processing unit 24 outputs a control signal or alarm signal to shut down the large bag nozzle mechanism.

[0025] The infrared position measurement probe 31 of the infrared auxiliary measurement system 3 is set above the tundish to detect the surface height of the molten steel in the tundish in real time. The detected liquid level signal is transmitted to the ladle casting flow control PLC 41 through the infrared measurement conversion device 32 as a correction factor for the tundish liquid level control model.

[0026] The tundish volume calculation module 43 of the ladle casting flow control PLC 41 calculates the molten steel level in real time based on received data such as the ladle weight, ladle car position, and billet pulling speed. The ladle level control module 44 generates control commands based on the set level height, ladle nozzle opening-steel flow model, and tundish volume data. During the first heat pouring stage and the last heat pouring stage, the ladle level control module 44 calls the start-up control model 45 and the finish-up control model 46, respectively, to achieve stable level control.

[0027] The drive conversion module 51 of the control execution unit 5 receives the digital signal output by the ladle casting flow control PLC 41 and converts it into drive current or hydraulic commands for the servo control module 52. The servo control module 52 (electric or hydraulic servo mechanism) drives the ladle sliding gate mechanism 53 according to the commands to adjust the molten steel flow rate, thereby controlling the liquid level height in the ladle.

[0028] The large-screen display 61 of the operation instruction unit 6 communicates with the ladle casting flow control PLC 41 via the ProfiBUS bus to display information such as ladle molten steel weight, tundish molten steel weight, and tundish liquid level height in real time; the on-site operation instruction box 62 is set at the ladle pouring position, and the operator can manually input the liquid level setting value and switch the control mode through the on-site operation instruction box 62 to realize flexible switching between automatic control and manual control.

[0029] In summary, the automatic control device for the liquid level in the continuous casting tundish provided by this utility model achieves automatic and precise control of the liquid level in the tundish through the coordinated work of various systems and units, and has high practicality and promotion value.

[0030] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, component disassembly or combination, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An automatic control device for liquid level in a continuous casting ladle, characterized in that, include: The intermediate bag weight weighing system includes a weighing head, a heat and shock protection device, an electronic weighing device, a digital display device, and a weighing module plate. The weighing head is installed at the bottom of the intermediate bag vehicle through the heat and shock protection device, and the weighing module plate is electrically connected to the electronic weighing device. The slag discharge detection system for the large bag includes a slag discharge detection sensor, a dedicated measuring cable, a preamplifier, and a central processing unit. The slag discharge detection sensor is installed on the reference plate of the large bag nozzle mechanism and is connected to the preamplifier through the dedicated measuring cable. An infrared-assisted measurement system includes an infrared position measuring probe and an infrared measurement conversion device. The infrared position measuring probe is positioned above the intermediate package and outputs a liquid level signal through the infrared measurement conversion device. The control PLC and model include a ladle casting flow control PLC, an operator station, a middle ladle volume calculation module, and a middle ladle liquid level control module. The ladle casting flow control PLC is electrically connected to the weighing module plate, the central processing unit, and the infrared measurement conversion device, respectively. The control execution unit includes a drive conversion module board, a servo control module, and a ladle sliding gate mechanism. The input end of the drive conversion module board is connected to the ladle casting flow control PLC, and the output end is connected to the servo control module. The servo control module drives the ladle sliding gate mechanism. The operation instruction unit includes a large screen display and a field operation instruction box. The large screen display communicates with the ladle casting flow control PLC via a ProfiBUS bus, and the field operation instruction box is connected to the ladle casting flow control PLC via signals.

2. The automatic control device for liquid level in a continuous casting ladle according to claim 1, characterized in that: The intermediate package weighing system includes four weighing heads, symmetrically distributed at the four corners of the intermediate package vehicle. The weighing module plate performs the tare operation according to the arrival signal of the intermediate package vehicle.

3. The automatic control device for liquid level in a continuous casting ladle according to claim 1, characterized in that: The slag detection sensor of the large-batch slag detection system is an electromagnetic induction coil. When the central processing unit detects that the slag content exceeds the threshold, it outputs a control signal or alarm signal to shut down the large-batch water inlet mechanism.

4. The automatic control device for liquid level in a continuous casting ladle according to claim 1, characterized in that: The infrared position measurement probe of the infrared auxiliary measurement system detects the surface height of the molten steel in the ladle in real time, and the infrared measurement conversion device transmits the liquid level parameters to the ladle casting flow control PLC as a correction factor for the ladle liquid level control model.

5. The automatic control device for liquid level in a continuous casting ladle according to claim 1, characterized in that: The intermediate ladle volume calculation module of the ladle casting flow control PLC calculates the molten steel level in real time based on the ladle weight, ladle car position and billet pulling speed; the intermediate ladle level control module generates control commands based on the set liquid level height, ladle nozzle opening-steel flow model and intermediate ladle volume data.

6. The automatic control device for liquid level in a continuous casting ladle according to claim 1, characterized in that: The intermediate liquid level control module is equipped with an initial pouring control model and an end-pouring control model.

7. The automatic control device for liquid level in a continuous casting ladle according to claim 1, characterized in that: The servo control module of the control execution unit is an electric or hydraulic servo mechanism. The drive conversion module board converts the digital signal output by the ladle casting flow control PLC into the drive current or hydraulic command of the servo control module.

8. The automatic control device for liquid level in a continuous casting ladle according to claim 1, characterized in that: The large screen display of the operation instruction unit displays the weight of molten steel in the ladle, the weight of molten steel in the tundish, and the liquid level in the tundish in real time.

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