Argon gas flow control device and method for steel tapping

Abstract

The present invention belongs to the technical field of iron and steel metallurgy, and specifically relates to a steel-tapping argon gas flow control device and method. The steel-tapping argon gas flow control device comprises a ladle, a ladle car, an argon gas storage device, a steel-making furnace, a first limit detection switch and a main control PLC; the ladle is arranged on the ladle car, and a weighing sensor is arranged at the contact point between the ladle and the ladle car, and the weighing sensor is connected to the main control PLC signal; the ladle has an air inlet and a liquid inlet, and the steel-making furnace has a steel outlet, which is located above the liquid inlet, and the air inlet is connected to the argon gas storage device through an argon gas flow pipeline; the first limit detection switch is connected to the main control PLC signal, and the signal of the first limit detection switch changes when the furnace body of the steel-making furnace rotates to the furnace return position; a mass flow controller is arranged on the argon gas flow pipeline, and the mass flow controller is connected to the main control PLC signal. The steel-tapping argon gas flow control device of the present invention can effectively reduce manual operation and stabilize on-site process control.

Description

Technical Field

[0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a steel-tapping argon gas flow control device and method. Background Art

[0002] In the field of iron and steel metallurgy, the argon flow rate in the ladle needs to be adjusted during the steel tapping process of the electric furnace / converter. Especially with the current transformation and development of the steel industry, the "electric furnaceization" of the converter adopts a post-furnace alloying operation mode, which requires adding alloys along with the steel flow and stirring with argon in the ladle, combined with setting the corresponding argon flow rate for each time period in the steel tapping process.

[0003] The conventional method of steel tapping argon flow is adjusted by the staff according to the stirring of the molten steel in the ladle. However, the argon control fluctuates greatly during the steel tapping process, causing a large loss of easily oxidized elements and affecting the quality of the molten steel. The fluctuation of the argon flow is likely to cause violent stirring of the ladle or production safety problems such as airtightness, which is not conducive to the stability of on-site process control. At the same time, the staff's control of the argon flow causes high labor intensity. With the development of iron and steel metallurgy, there is a need to further stabilize process control and reduce the labor intensity of employees.

[0004] Therefore, it is necessary to provide an improved technical solution to address the above-mentioned deficiencies in the prior art. Summary of the invention

[0005] The object of the present invention is to provide a steel-tapping argon gas flow control device with a high degree of automation, which can effectively reduce manual operations and stabilize on-site process control.

[0006] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a steel-tapping argon flow control device, comprising a ladle, a ladle car, an argon storage device, a steelmaking furnace, a first limit detection switch and a main control PLC; the ladle is arranged on the ladle car, and a weighing sensor is arranged at the contact point between the ladle and the ladle car, and the weighing sensor is connected to the main control PLC signal; the ladle has an air inlet and a liquid inlet, and the steelmaking furnace has a steel outlet, the steel outlet is located above the liquid inlet, and the air inlet is connected to the argon storage device through an argon flow pipeline; the first limit detection switch is connected to the main control PLC signal, and the signal of the first limit detection switch changes when the furnace body of the steelmaking furnace rotates to the return position; a mass flow controller is provided on the argon flow pipeline for measuring and adjusting the flow of argon in the argon flow pipeline, and the mass flow controller is connected to the main control PLC signal.

[0007] Preferably, the first limit detection switch is arranged at the re-melting position of the furnace body of the steelmaking furnace. When the furnace body of the steelmaking furnace rotates to the re-melting position, it contacts the first limit detection switch, and the signal detected by the first limit detection switch changes.

[0008] Preferably, the steelmaking furnace is an electric furnace or a converter.

[0009] Preferably, a tray for sealing the steel outlet is provided at the steel outlet, and the tray is connected to the output shaft of the hydraulic cylinder. The hydraulic cylinder pushes the tray to move under the control of the hydraulic control system to open or close the steel outlet; a manual valve for avoiding failure of the hydraulic control system is also provided on the oil inlet pipe of the hydraulic cylinder, and a handle for opening and closing the manual valve is provided on the manual valve. A second limit detection switch is provided on one side of the manual valve, and the second limit detection switch is connected to the main control PLC signal. The signal changes when the second limit detection switch contacts the handle.

[0010] Preferably, the control device also includes a weighing signal receiving instrument connected to the main control PLC signal, and the ladle car is also provided with a signal-connected vehicle-mounted weighing signal transmitting instrument and a weighing transmitting antenna, the vehicle-mounted weighing signal transmitting instrument is signal-connected to the weighing sensor, and the weighing transmitting antenna is signal-connected to the weighing signal receiving instrument.

[0011] Preferably, the weighing sensor is wirelessly connected to the vehicle-mounted weighing signal transmitting instrument, and the weighing transmitting antenna is wirelessly connected to the weighing signal receiving instrument.

[0012] Preferably, the ladle has an ear shaft, the ladle car is provided with a support frame, the support frame has a slot, the ear shaft is assembled in the slot, the weighing sensor is arranged in the slot and contacts with the ear shaft.

[0013] Preferably, two support frames are provided, and the two support frames are provided on both sides of the ladle, and each of the support frames has a slot, and the ladle has an ear shaft on both sides corresponding to the two support frames, and the two ear shafts are correspondingly assembled in the two slots; two weighing sensors are provided, and the two weighing sensors are correspondingly arranged in the two slots and in contact with the corresponding ear shafts.

[0014] The present invention also provides a method for controlling the flow rate of argon gas for steel tapping, which adopts the following technical scheme: a method for controlling the flow rate of argon gas for steel tapping, using the argon gas flow rate control device for steel tapping as described above to control the flow rate of argon gas for steel tapping, the control method comprising the following steps:

[0015] The main control PLC receives the current weight signal detected by the weighing sensor and the current signal change detected by the first limit detection switch; the main control PLC determines the current argon flow rate corresponding to the received signal according to the current weight signal detected by the weighing sensor and the current signal change detected by the first limit detection switch; the main control PLC controls the mass flow controller according to the current argon flow rate to control the flow rate of argon in the argon flow pipeline.

[0016] Preferably, the signal output by the main control PLC to the mass flow controller is a 4-20mA signal.

[0017] Preferably, the control method comprises:

[0018] (1) From the beginning of steel tapping to the end of steel tapping and remelting: the main control PLC determines the current flow rate of argon gas according to the signal change detected by the weighing sensor, and sends a signal to the mass flow controller to control the flow rate of argon gas;

[0019] (2) From the stage of returning to the furnace to the stage of the ladle leaving the station: the main control PLC first determines the current flow rate of the argon gas according to the signal change detected by the first limit detection switch, and sends a signal to the mass flow controller to control the flow rate of the argon gas; then determines the current flow rate of the argon gas according to the signal change detected by the weighing sensor, and sends a signal to the mass flow controller to control the flow rate of the argon gas.

[0020] Preferably, the control method also includes a stage from the entry of the ladle to the start of steel tapping, during which the weight detected by the weighing sensor is greater than 0 and the signal detected by the second limit detection switch changes.

[0021] Preferably, the stage from the start of steel tapping to the completion of steel tapping and remelting includes two stages: a steel tapping amount of less than 20 tons and a steel tapping amount of more than 20 tons.

[0022] Preferably, during the period from the start of steel tapping to the stage when the steel tapping amount reaches 20t, the flow rate of argon is controlled to be 200Nl / min; during the period from the steel tapping amount reaching 20t to the completion of steel tapping and remelting, the flow rate of argon is controlled to be 500Nl / min.

[0023] Preferably, the stage from the completion of the remelting to the ladle leaving the station includes the following steps:

[0024] (1) when the first limit detection switch detects that the furnace body of the steelmaking furnace rotates to the furnace return position, controlling the mass flow controller to adjust the argon gas flow rate to 80 Nl / min;

[0025] (2) According to the signal detected by the weighing sensor indicating that the ladle has left the ladle car, the mass flow controller is controlled to adjust the flow rate of the argon gas to 0 Nl / min.

[0026] Beneficial effects: The steel-discharging argon flow control device of the present invention has a high degree of automation, is easy to control the argon flow, and is beneficial to the stability of on-site control; in addition, it can also effectively reduce manual operations and reduce the labor intensity of employees. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. Among them:

[0028] Figure 1 A structural schematic diagram of the setting position of the first limit detection switch in the steel-tapping argon control device provided in an embodiment of the present invention;

[0029] Figure 2 A schematic cross-sectional structure diagram of a ladle car, a ladle and an argon storage device in a steel-tapping argon flow control device provided in an embodiment of the present invention;

[0030] Figure 3 A schematic cross-sectional structural diagram of a side view of a support frame of a ladle car provided in an embodiment of the present invention;

[0031] Figure 4 A schematic diagram of the cross-sectional structure of a front view of a ladle provided in an embodiment of the present invention;

[0032] Figure 5 A schematic diagram of the connection relationship of the main control PLC of the steel-tapping argon gas flow control device provided in an embodiment of the present invention;

[0033] Figure 6 A schematic diagram of the positional relationship of components for controlling the opening and closing of a steel outlet provided in an embodiment of the present invention;

[0034] Figure 7 The argon flow diagram at different stages of the steel tapping process provided by the embodiment of the present invention.

[0035] In the figure: 100- ladle car; 200- ladle; 300- argon gas storage device; 400- steelmaking furnace; 500- main control PLC;

[0036] 110-support frame; 111-card slot; 120-vehicle weighing signal transmitter; 130-weighing transmitter antenna

[0037] Line; 140- weighing sensor;

[0038] 210-trunnion;

[0039] 310-argon gas flow line; 320-mass flow controller;

[0040] 410-tray; 420-connecting rod; 430-hydraulic cylinder; 440-oil inlet pipe; 450-oil outlet pipe; 441-manual valve; 460-second limit detection switch; 470-steel outlet; 480-first limit detection switch;

[0041] 510-Weighing signal receiving instrument. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0043] The present invention will be described in detail below in conjunction with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0044] Aiming at the problems that the argon gas flow rate of steel tapping is difficult to control and the labor intensity of operators is high in the current steel-making furnace steel tapping process, the present invention provides a steel tapping argon gas flow rate control device.

[0045] like Figure 1-6 As shown, the steel-tapping argon flow control device of the present invention adopts the following technical scheme: an argon flow control device for steel-tapping, comprising a ladle 200, a ladle car 100, an argon storage device 300, a steel-making furnace 400, a first limit detection switch 480 and a main control PLC; the ladle 200 is arranged on the ladle car 100, and a weighing sensor 140 is arranged at the contact point between the ladle 200 and the ladle car 100, and the weighing sensor 140 is connected to the main control PLC signal; the ladle 200 has an air inlet (arranged at the bottom of the ladle 200) and a liquid inlet (arranged at the top of the ladle 200), the steel-making furnace 400 has a steel outlet 470, the steel outlet 470 is located above the liquid inlet, and the air inlet is connected to the main control PLC signal by an argon flow pipe. Line 310 is connected to the argon storage device 300; the first limit detection switch 480 is connected to the main control PLC signal, and the signal of the first limit detection switch 480 changes when the furnace body of the steelmaking furnace 400 rotates to the return furnace position (the return furnace position refers to the final position of the furnace body after the steelmaking is completed, when the furnace body rotates); a mass flow controller 320 is provided on the argon flow pipeline 310 (the mass flow controller 320 has a component for measuring the flow rate and an electromagnetic regulating valve / piezoelectric valve, and the opening of the electromagnetic regulating valve / piezoelectric valve can be adjusted according to the received signal to achieve flow regulation), which is used to measure and adjust the flow rate of argon in the argon flow pipeline 310, and the mass flow controller 320 is connected to the main control PLC500 signal.

[0046] In a preferred embodiment of the present invention, the first limit detection switch 480 is arranged at the re-melting position of the furnace body of the steelmaking furnace 400. When the furnace body of the steelmaking furnace 400 rotates to the re-melting position, it contacts the first limit detection switch 480 (when the furnace body of the steelmaking furnace 400 is at any position other than the re-melting position, it does not contact the first limit detection switch 480), and the signal detected by the first limit detection switch 480 changes.

[0047] In a preferred embodiment of the present invention, the first limit detection switch 480 is disposed at the furnace return position and away from one end of the steel outlet 470 .

[0048] In a preferred embodiment of the present invention, the steelmaking furnace 400 is an electric furnace or a converter.

[0049] In a preferred embodiment of the present invention, a tray 410 for sealing the steel outlet 470 is provided at the steel outlet 470 (the tray in the present invention is only used to refer to a component for sealing the steel outlet, and does not include other limitations, and a steel outlet sealing component commonly used in the prior art can be used), and the tray 410 is connected to the output shaft of the hydraulic cylinder 430. The hydraulic cylinder 430 pushes the tray 410 to move under the control of the hydraulic control system to open or close the steel outlet 470; the oil inlet pipe 440 of the hydraulic cylinder 430 is also provided with a manual valve 441 for avoiding failure of the hydraulic control system (similarly, a manual valve 441 can also be provided at the oil outlet of the hydraulic cylinder 430). A manual valve is provided on the oil inlet pipe 440, and a handle (not shown in the figure) for opening and closing the manual valve 441 is provided on the manual valve 441. A second limit detection switch 460 is provided on one side of the manual valve 441. The second limit detection switch 460 is connected to the signal of the main control PLC500. When the second limit detection switch 460 contacts the handle, the signal changes (when the second limit detection switch 460 contacts the handle, the manual valve 441 is closed. When the manual valve 441 is closed, the steel outlet is in a closed state, and the hydraulic pressure on the oil inlet pipe 440 and the oil outlet pipe 450 is already in a closed state under the control of the hydraulic control system). Among them, the structures of the above-mentioned hydraulic cylinder 430, hydraulic control system (a system for controlling the opening or closing of the steel outlet) and the tray 410, as well as the connection relationship between the above-mentioned components, can respectively adopt components commonly used in the prior art. The steelmaking furnaces commonly used in the prior art all include the above-mentioned structures, which will not be repeated here; "manual valve 441 for avoiding failure of the hydraulic control system" refers to a valve provided to avoid abnormal opening of the steel outlet due to oil seepage or leakage caused by failure of the hydraulic cylinder or hydraulic valve, which is equivalent to a safety.

[0050] In a preferred embodiment of the present invention, the control device further includes a weighing signal receiving instrument 510 connected to the main control PLC 500 by signal, and the ladle car 100 is also provided with a vehicle-mounted weighing signal transmitting instrument 120 and a weighing transmitting antenna 130 connected by signal, the vehicle-mounted weighing signal transmitting instrument 120 is connected to the weighing sensor 140 by signal, and the weighing transmitting antenna 130 is connected to the weighing signal receiving instrument 510 by signal. It should be noted that the signal connection here can be connected by a signal line (i.e., a wired connection) or by a local network signal connection (i.e., a wireless connection), which is not limited here and is within the protection scope of the present invention.

[0051] In a preferred embodiment of the present invention, the weighing sensor 140 is wirelessly connected to the vehicle-mounted weighing signal transmitting instrument 120 , and the weighing transmitting antenna 130 is wirelessly connected to the weighing signal receiving instrument 510 .

[0052] In a preferred embodiment of the present invention, the ladle 200 has an ear shaft 210, the ladle car 100 is provided with a support frame 110, the support frame 110 has a slot 111, the ear shaft 210 is assembled in the slot 111, the weighing sensor 140 is arranged in the slot 111 and contacts with the ear shaft 210.

[0053] In a preferred embodiment of the present invention, two support frames 110 are provided, and the two support frames 110 are provided on both sides of the ladle 200. Each support frame 110 has a slot 111. The ladle 200 has an ear shaft 210 on both sides corresponding to the two support frames 110, and the two ear shafts 210 are correspondingly assembled in the two slots 111; two weighing sensors 140 are provided, and the two weighing sensors 140 are correspondingly arranged in the two slots 111 and contact the corresponding ear shafts 210. Such a setting can ensure the stability of the setting of the ladle 200, and the use of two weighing sensors 140 can ensure that its weighing data (i.e., the average value of the data of the two weighing sensors 140) is relatively accurate.

[0054] The present invention also provides a method for controlling the argon flow rate of steel tapping, and the specific technical scheme is as follows: the argon flow rate control device for steel tapping as described above is used to control the flow rate of argon gas for steel tapping, and the control method includes the following steps: the main control PLC500 receives the current weight signal detected by the weighing sensor 140 and the current signal change detected by the first limit detection switch 480; the main control PLC500 determines the current argon flow rate corresponding to the received signal based on the current weight signal detected by the weighing sensor 140 and the current signal change detected by the first limit detection switch 480; the main control PLC500 controls the mass flow controller 320 according to the current argon flow rate to control the flow rate of argon gas in the argon flow pipeline 310.

[0055] In a preferred embodiment of the present invention, the signal output by the main control PLC 500 to the mass flow controller 320 is a 4-20 mA electrical signal.

[0056] In a preferred embodiment of the present invention, the control method includes:

[0057] (1) From the beginning of steel tapping to the end of steel tapping and remelting: the main control PLC 500 determines the current flow rate of argon gas according to the signal change detected by the weighing sensor 140, and sends a signal to the mass flow controller 320 to control the flow rate of argon gas.

[0058] (2) From the stage of the ladle leaving the station after the return to the furnace: the main control PLC500 first determines the current flow rate of argon according to the signal change detected by the first limit detection switch 480 (when the furnace body of the steelmaking furnace 400 rotates to the return to the furnace position, it contacts the first limit detection switch 480, and the signal detected by the first limit detection switch 480 changes), and sends a signal to the mass flow controller 320 to control the flow rate of argon; then, according to the signal change detected by the weighing sensor 140 (after the furnace body of the steelmaking furnace 400 rotates to the return to the furnace position, the ladle 200 is lifted from the ladle car 100 by the lifting equipment, and the weight detected by the weighing sensor 140 gradually decreases), the current flow rate of argon is determined and a signal is sent to the mass flow controller 320 to control the flow rate of argon (after the ladle 200 is completely lifted off the ladle car 100).

[0059] In a preferred embodiment of the present invention, the control method also includes a stage from the entry of the ladle to the start of steel tapping, in which the weight detected by the weighing sensor 140 received is greater than 0 and the signal detected by the second limit detection switch 460 changes (used to indicate that the steel tapping port 470 is open. When the steel tapping port 470 is opened, the manual valve 441 on the oil inlet pipe 440 and the oil outlet pipe 450 needs to be opened. At this time, the handle is not in contact with the second limit detection switch 460, and the signal detected by the second limit detection switch 460 changes).

[0060] In a preferred embodiment of the present invention, Figure 7 As shown, the stage from the beginning of steel tapping to the completion of steel tapping includes two stages: the steel tapping amount is less than 20t and the steel tapping amount is more than 20t.

[0061] In a preferred embodiment of the present invention, the flow rate of argon is controlled to be 200Nl / min from the beginning of steel tapping to the stage when the steel tapping amount reaches 20t; the flow rate of argon is controlled to be 500Nl / min from the process when the steel tapping amount reaches 20t to the completion of steel tapping and remelting.

[0062] In a preferred embodiment of the present invention, the stage from the completion of the remelting to the ladle leaving the station includes the following steps:

[0063] (1) When the first limit detection switch 480 detects that the furnace body of the steelmaking furnace 400 rotates to the furnace return position, the mass flow controller 320 is controlled to adjust the argon gas flow rate to 80 Nl / min.

[0064] (2) According to the signal detected by the weighing sensor 140 indicating that the ladle 200 has left the ladle car 100, the mass flow controller 320 is controlled to adjust the flow rate of the argon gas to 0 Nl / min.

[0065] In a preferred embodiment of the present invention, specifically, the method for controlling the flow rate of argon gas for steel tapping can be as follows:

[0066] When the furnace is tapping steel, the ladle 200 contacts the weighing sensor 140 provided in the slot 110 of the ladle car 100, and the ladle weight is manually reset to 0t; the operator opens the manual valve 441 on the pipeline (oil inlet pipe 440, oil outlet pipe 450) of the hydraulic cylinder 430 that controls the movement of the tray 410 to realize the switch of the steel outlet 470. At this time, the handle controlling the manual valve 441 and the second limit detection switch 460 change from a state of mutual contact to a state where the handle on the manual valve 441 and the second limit detection switch 460 are no longer in contact with each other. The change in the signal detected by the second limit detection switch 460 is used as the steel tapping electrical signal (after the manual valve is opened, the hydraulic control system controls the movement of the tray and the steel outlet is opened). After the steel tapping starts, the weight of the molten steel in the ladle 100 gradually increases. After the main control PLC500 receives the molten steel weight signal, it outputs a control signal to the mass flow controller 320 to make the argon gas flow rate 200Nl / min.

[0067] During the steel-making process, the weight of the molten steel in the ladle car gradually increases. When the weighing sensor 140 detects that the weight of the molten steel in the ladle 200 reaches 20t, the alloy starts to be added. At the same time, the main control PLC500 gives an electrical signal to the mass flow controller 320 according to the signal received by the weighing signal receiving instrument 510 (the weighing sensor 140 transmits the signal to the on-board weighing signal transmitting instrument 120, the weighing transmitting antenna 130 and the weighing signal receiving instrument 510 in sequence), and adjusts the argon gas flow control to 500Nl / min.

[0068] After the steel is discharged (the steel outlet is closed), the furnace is shaken to rotate the furnace body to the return position. The furnace body rotates to the return position and contacts the first limit detection switch 480. The signal detected by the first limit detection switch 480 changes, and then an electrical signal is sent to the main control PLC500. The main control PLC500 further outputs a signal to the mass flow controller 320 to reduce the argon flow rate to 80Nl / min.

[0069] When the ladle 100 is lifted off the ladle car 200, the weight display shows a negative value, and the ladle weight is manually reset to 0t. At this time, an electrical signal is sent to the main control PLC500, and the main control PLC500 further outputs an electrical signal to the mass flow controller 320 to adjust the argon flow rate to 0Nl / min, thereby completing the control of the argon flow rate during the steelmaking process.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for controlling argon flow rate during steel tapping, characterized in that: The flow rate of argon gas for steel tapping is controlled by using a steel tapping argon gas flow control device, wherein the steel tapping argon gas flow control device comprises a ladle, a ladle car, an argon gas storage device, a steelmaking furnace, a first limit detection switch and a main control PLC; The ladle is arranged on the ladle car, a weighing sensor is arranged at the contact point between the ladle and the ladle car, and the weighing sensor is connected to the main control PLC signal; The ladle has an air inlet and a liquid inlet, the steelmaking furnace has a steel outlet, the steel outlet is located above the liquid inlet, and the air inlet is connected to the argon storage device through an argon flow pipeline; The first limit detection switch is connected to the main control PLC signal, and the signal of the first limit detection switch changes when the furnace body of the steelmaking furnace rotates to the furnace return position; The argon flow pipeline is provided with a mass flow controller for measuring and adjusting the flow of argon in the argon flow pipeline, and the mass flow controller is connected to the main control PLC signal; A tray for sealing the steel outlet is provided at the steel outlet, the tray is connected to the output shaft of the hydraulic cylinder, and the hydraulic cylinder pushes the tray to move under the control of the hydraulic control system to open or close the steel outlet; A manual valve for preventing the hydraulic control system from failing is also provided on the oil inlet pipe of the hydraulic oil cylinder, a handle for opening and closing the manual valve is provided on the manual valve, a second limit detection switch is provided on one side of the manual valve, the second limit detection switch is connected to the main control PLC signal, and the signal changes when the second limit detection switch contacts the handle; The control method comprises the following steps: The main control PLC receives the current weight signal detected by the weighing sensor and the current signal change detected by the first limit detection switch; The main control PLC determines the current argon gas flow corresponding to the received signal according to the current weight signal detected by the weighing sensor and the current signal change detected by the first limit detection switch; The main control PLC controls the mass flow controller according to the current argon flow rate to control the flow rate of argon in the argon flow pipeline.

2. The method for controlling the steel-tapping argon flow rate according to claim 1, characterized in that: The signal output by the main control PLC to the mass flow controller is a 4-20mA signal.

3. The method for controlling the steel-tapping argon flow rate according to claim 1, characterized in that: The control method comprises: (1) From the beginning of steel tapping to the end of steel tapping and remelting: the main control PLC determines the current flow rate of argon gas according to the signal change detected by the weighing sensor, and sends a signal to the mass flow controller to control the flow rate of argon gas; (2) From the stage of returning to the furnace to the stage of the ladle leaving the station: the main control PLC first determines the current flow rate of the argon gas according to the signal change detected by the first limit detection switch, and sends a signal to the mass flow controller to control the flow rate of the argon gas; then determines the current flow rate of the argon gas according to the signal change detected by the weighing sensor, and sends a signal to the mass flow controller to control the flow rate of the argon gas.

4. The method for controlling the steel-tapping argon flow rate according to claim 3, characterized in that: The control method also includes a stage from the ladle entering the station to the start of steel tapping, during which the weight detected by the weighing sensor is greater than 0 and the signal detected by the second limit detection switch changes.

5. The method for controlling the steel-tapping argon gas flow rate according to claim 3, characterized in that: The stage from the beginning of steel tapping to the completion of steel tapping includes two stages: the steel tapping volume is less than 20t and the steel tapping volume is more than 20t.

6. The method for controlling the argon flow rate of steel tapping according to claim 5, characterized in that: During the period from the beginning of steel tapping to the stage when the steel tapping amount reaches 20t, the flow rate of argon gas is controlled at 200Nl / min; during the period from the steel tapping amount reaching 20t to the completion of steel tapping and remelting, the flow rate of argon gas is controlled at 500Nl / min.

7. The method for controlling the argon flow rate of steel tapping according to any one of claims 3 to 6, characterized in that: The stage from the end of the remelting to the ladle leaving the station includes the following steps: (1) when the first limit detection switch detects that the furnace body of the steelmaking furnace rotates to the furnace return position, controlling the mass flow controller to adjust the argon gas flow rate to 80 Nl / min; (2) According to the signal detected by the weighing sensor indicating that the ladle has left the ladle car, the mass flow controller is controlled to adjust the flow rate of the argon gas to 0 Nl / min.

8. The method for controlling the argon flow rate of steel tapping according to claim 1, characterized in that: The first limit detection switch is arranged at the furnace body's return position of the steelmaking furnace. When the furnace body of the steelmaking furnace rotates to the return position, it contacts the first limit detection switch, and the signal detected by the first limit detection switch changes.

9. The method for controlling the argon flow rate of steel tapping according to claim 1, characterized in that: The steelmaking furnace is an electric furnace or a converter.

10. The method for controlling the argon flow rate of steel tapping according to claim 1, characterized in that: The control device also includes a weighing signal receiving instrument connected to the main control PLC signal. The ladle car is also provided with a signal-connected vehicle-mounted weighing signal transmitting instrument and a weighing transmitting antenna. The vehicle-mounted weighing signal transmitting instrument is signal-connected to the weighing sensor, and the weighing transmitting antenna is signal-connected to the weighing signal receiving instrument.

11. The method for controlling the argon flow rate of steel tapping according to claim 10, characterized in that: The weighing sensor is wirelessly connected to the vehicle-mounted weighing signal transmitting instrument, and the weighing transmitting antenna is wirelessly connected to the weighing signal receiving instrument.

12. The method for controlling the argon flow rate of steel tapping according to any one of claims 8 to 11, characterized in that: The ladle has an ear shaft, the ladle car is provided with a support frame, the support frame has a slot, the ear shaft is assembled in the slot, the weighing sensor is arranged in the slot and contacts with the ear shaft.

13. The method for controlling the argon flow rate of steel tapping according to claim 12, characterized in that: There are two support frames, which are arranged on both sides of the ladle, each of which has a slot, and the ladle has an ear shaft on both sides corresponding to the two support frames, and the two ear shafts are correspondingly assembled in the two slots; There are two weighing sensors, which are correspondingly arranged in the two slots and in contact with corresponding ear shafts.

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