Blast furnace molten iron weight on-line measuring system and working method thereof

Abstract

The invention discloses a blast furnace molten iron weight on-line measuring system and a working method thereof, the system comprises a weighing box body, a field junction box, a vehicle-mounted instrument, a furnace front display screen and a system acquisition PLC, and a weighing sensor is installed in an inner cavity of the weighing box body and used for obtaining the mass of a molten iron ladle and the mass of molten iron in the molten iron ladle. According to the invention, after the molten iron car in the blast furnace area is transformed and the weighing system is additionally arranged, a field post worker can directly and intuitively see the weight of the molten iron in the current ladle according to the large display screen mounted on the coil base, and timely control the ladle-to-ladle operation according to the target of a company; hysteresis caused by the fact that the loading amount needs to be controlled according to data after weighing through a wagon balance is reduced, and the labor intensity of workers is reduced; according to the utility model, many problems existing in the conventional weighing system are solved, and the stability, timeliness and reliability of weighing are obviously improved; the operation process is accurate in measurement, the problem of back-and-forth ladle-to-ladle process in the subsequent process of production is solved, and basic guarantee is provided for environmental protection and efficient utilization of molten iron energy consumption.

Description

Technical Field

[0001] The invention relates to the technical field of metallurgy, in particular to an online measurement system for molten iron weight of a blast furnace and a working method thereof. Background Art

[0002] The commonly used methods for measuring molten iron in blast furnaces are weighbridge measurement and rail scale measurement. Except for rail scale measurement which is online real-time measurement, weighbridge measurement is offline measurement and cannot effectively control the weight of each bag of molten iron, which increases the bag unloading work and production cost of steelmaking. In view of this situation, a method for online measurement of molten iron weight in blast furnaces is designed, which realizes the online measurement of molten iron in non-railway transportation and improves the loading efficiency of molten iron bags.

[0003] In blast furnace ironmaking production, molten iron is the main product of blast furnace production. After the blast furnace taps iron regularly, the molten iron needs to be transported to the steelmaking workshop for steelmaking production. Therefore, molten iron transportation is an important link for blast furnaces. Different types of blast furnaces have different forms of molten iron transportation. For example, the transportation of molten iron in small blast furnaces is mainly by car transportation because the amount of iron tapped per furnace is relatively small. The amount of iron tapped each time in large blast furnaces is relatively large, and it is mainly transported by rail. The molten iron transported must be measured each time. The measurement of molten iron transported by car is basically measured by a floor scale, and the molten iron transported by rail is measured by a track scale installed on the track below the package. The advantages of floor scale measurement and track scale measurement are static weighing, high measurement accuracy, and the ability to accurately measure the amount of iron tapped by the blast furnace.

[0004] With the acceleration of the pace of steel production, the requirements for cost reduction, efficiency improvement and environmental protection have also put forward higher requirements for the transportation of molten iron. In the past, the control basis for loading molten iron into the ladle was not to exceed the safety control line of the ladle. The weight of each ladle of molten iron had a large deviation. After the ladle arrived at the steelmaking workshop, it would be poured into the mixing furnace, and finally the molten iron from the mixing furnace would be loaded into the ladle. In this way, the weight of each ladle of molten steel could be controlled. In the process of pouring molten iron into the mixing furnace, a lot of yellow smoke would be generated, which would pollute the environment. Although dust collectors were installed at the ladle pouring point, smoke and dust still came out, and each time the ladle was poured, the heat of the molten iron would be lost, which was a waste of energy. Therefore, the one-bag-to-the-end production method became a production demand. The molten iron ladle no longer passed through the mixing furnace for transfer. After the molten iron ladle arrived at the steelmaking workshop, it was directly poured into the ladle for production. This required a relatively clear requirement for the weight control of each bag of molten iron.

[0005] To improve the online molten iron loading weight control of the ladle, it is necessary to measure the molten iron when it is loaded, and implement online weighing. According to the actual situation on site, it is proposed to install a floor scale at the ladle position and install an online weighing device on the ladle rack of the automobile. The two methods are as follows:

[0006] (1) Installing a floor scale at the ladle position can improve the accurate control of the weight of the iron, but there is a problem that the floor scale needs to be installed in a sunken manner, and the floor scale surface and the ground are made into a plane. During the implementation process, a section of the floor scale extends out of the ladle position, resulting in water accumulation on the foundation of the floor scale on rainy days. This is a major safety hazard. At the same time, slag and garbage are easily accumulated in the pit. Due to the continuous production process of the blast furnace, the maintenance cycle is long, and the floor scale pit is not convenient for daily cleaning and maintenance. Over time, the weighing accuracy cannot be ensured. Therefore, this solution is not suitable for use. In addition, the cost of the floor scale itself is relatively high, and a dedicated foundation pit is required, and the return on investment is relatively long;

[0007] (2) Installing a weighing device on the ladle rack of a car can avoid major safety hazards during the iron-making process. The installation is simple and convenient, and the equipment can be maintained at any time, thereby realizing online iron weight measurement. However, the measurement accuracy in the prior art cannot meet the actual production needs.

[0008] Therefore, it is necessary to develop an online measurement system for molten iron weight of a blast furnace and a working method thereof to solve the above problems. Summary of the invention

[0009] The technical problem to be solved by the present invention is to provide an online measurement system for the weight of molten iron in a blast furnace and a working method thereof in view of the above-mentioned deficiencies in the prior art, so as to solve the above-mentioned deficiencies raised in the background technology. Compared with the prior art, the online weighing system provided by the present invention is installed on the frame of the molten iron car. Each car has a weighing system and can communicate with the large display screen in front of each blast furnace to display relevant real-time weight data. It is characterized by high efficiency, flexibility and convenience.

[0010] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0011] A blast furnace molten iron weight online measurement system, comprising:

[0012] The weighing box located on the frame is used to place the molten iron ladle. A weighing sensor is installed in the inner cavity of the weighing box to obtain the mass of the molten iron ladle and the molten iron inside;

[0013] The field junction box located on the frame is used to supply power to the weighing sensor and receive signals, and to aggregate and convert the four received signals;

[0014] The vehicle-mounted instrument includes a vehicle-mounted screen for displaying weight and a transmitter controller, wherein the vehicle-mounted screen is electrically connected to the transmitter controller, and the transmitter controller is communicatively connected to the field wiring box, wherein the transmitter controller obtains integrated data from the field wiring box and displays it in real time on the vehicle-mounted screen;

[0015] The furnace front display screen located on one side of the blast furnace is paired with the nearby on-board instrument through the Bluetooth module. The furnace front display screen receives and displays the quality data of the paired on-board screen of the molten iron car;

[0016] The system acquisition PLC located in the electrical room is placed on the operating computer, which displays the iron output of each molten iron ladle in real time and automatically records it in the system memory.

[0017] Preferably, the weighing box includes a load-bearing beam assembly and a bottom plate assembly located in its inner cavity, the load-bearing beam assembly and the bottom plate assembly are respectively located at the top and bottom of the weighing sensor, and the load-bearing beam assembly and the weighing sensor are fixed by a weighing pressure head and a screw combination, and the bottom plate assembly is installed on the frame;

[0018] A wedge-shaped limiter is fixedly connected to the inner side surface of the middle position of the load-bearing beam assembly, and a slot matching the wedge-shaped limiter is provided on the side wall of the inner cavity of the weighing box to control the position of the molten iron ladle inside the weighing box. A first limit stopper is provided on both sides of the top of the load-bearing beam assembly, and a second limit stopper is provided on both sides of the top of the inner cavity of the weighing box. The ends of the first limit stopper are flush with those of the second limit stopper, and the outer sides of the first limit stopper and the second limit stopper are both wedge-shaped.

[0019] Preferably, at least two weighing sensors are installed in each weighing box, and the load-bearing beam assembly is horizontally mounted on the sensing ends of the multiple weighing sensors, and a buffer sheet is padded between the load-bearing beam assembly and the main structure of the weighing sensor;

[0020] The number and installation positions of the weighing pressure heads correspond one-to-one to the plurality of weighing sensors, and the tops of the weighing pressure heads protrude from the upper surface of the load-bearing beam assembly.

[0021] Preferably, the weighing sensor is detachably connected to the base plate assembly by screws, a mounting groove is reserved inside the weighing box and located at the top of the load-bearing beam assembly, and a lifting ring is threadedly connected to the top of the load-bearing beam assembly and located in the middle position between two adjacent weighing pressure heads, which is used for transferring the load-bearing beam assembly and its connecting parts.

[0022] Preferably, the vehicle-mounted instrument further includes a parameter setting module and a debugging module for adjusting system parameters and working environment.

[0023] Preferably, the output end of the transmitter controller is electrically connected to a wireless transmitting function, the input end of the furnace front display screen is electrically connected to a wireless receiving device, and the wireless transmitting function is wirelessly communicated with the wireless receiving device, so that the data combined and integrated by the on-site wiring box can be transmitted to the transmitter controller for further processing.

[0024] Preferably, the output end of the molten iron ladle and the input and output ends of the blast furnace are all provided with solenoid valves, the solenoid valve located on the molten iron ladle is communicatively connected to the transmitter controller, and the solenoid valve located on the blast furnace is communicatively connected to the controller on the side of the display screen in front of the furnace and the system acquisition PLC.

[0025] Preferably, the on-board instrument is located in the cab of the molten iron car, and the cab pulls the frame to move, and the weighing box is detachably connected to the frame.

[0026] A working method of an online measurement system for molten iron weight of a blast furnace comprises the following steps:

[0027] S1. Drive the molten iron vehicle equipped with a weighing system to the iron-out position of the blast furnace, place an empty molten iron ladle in the installation slot of the weighing box, and then connect the input end of the molten iron ladle with the output end of the blast furnace. At this time, the display screen in front of the furnace is paired and connected with the nearby on-board instrument through the Bluetooth module;

[0028] S2, control the solenoid valve on the molten iron ladle and the solenoid valve at the output end of the blast furnace to open, so that the molten iron in the blast furnace can flow into the molten iron ladle, and the bottom of the molten iron ladle acts on the weighing pressure head, so that the sensing value of the weighing sensor changes;

[0029] S3, the field junction box obtains the sensing signals of multiple weighing sensors and aggregates and converts them. The integrated data is received by the transmitter controller and displayed in real time on the vehicle screen;

[0030] The display screen in front of the furnace receives and displays the paired molten iron car screen quality data, and transmits it to the operating computer through the system acquisition PLC, displays the iron output of each molten iron ladle in real time, and automatically records it in the system memory;

[0031] S4. The driver and on-site workers can intuitively see the weight of the molten iron in the current ladle based on the data on the display screen in front of the furnace. According to the filling target, they can promptly control the ladle pouring operation and close the corresponding solenoid valve.

[0032] S5. The driver transfers the precisely measured and filled molten iron bags to the steelmaking workshop and directly pours them into the ladle for production.

[0033] The present invention has the following beneficial effects:

[0034] 1. After the molten iron car in the blast furnace area has been renovated and a weighing system has been added, on-site workers can directly see the weight of the molten iron in the ladle through the large display screen installed on the furnace, and timely control the ladle dumping operation according to the company's goals; the lag caused by the need to weigh on the scale and then control the loading amount according to the data has been reduced, and the labor intensity of workers has been reduced; many problems existing in the previous weighing system have been solved, and the stability, timeliness and reliability of weighing have been significantly improved; the operation process is accurately measured, which solves the process of dumping the ladle back and forth in the later production process, and provides a basic guarantee for environmental protection and efficient use of molten iron energy consumption;

[0035] 2. After the system equipment is put into use, it can timely and accurately control the loading weight according to production needs. The weighing control range can be controlled within the required range of 1%-2%, which well meets the production requirements of weight control within the target weight + 1 ton, and has produced great economic and environmental benefits; the cost of the molten iron car after transformation is low and easy to maintain. After the equipment is installed in accordance with the regulations, the overall equipment maintenance is mainly focused on the problems of loose plugs and line wear caused by vibration caused by dynamic transportation of the vehicle, and the maintenance work and spare parts consumption are effectively controlled;

[0036] 3. The economic benefits generated after the system was put into use are obvious. The production rhythm of one package to the end is realized. There is no need to turn the package back and forth in the steelmaking area, which causes the loss of molten iron temperature. The molten iron temperature is effectively utilized, and the consumption of electrodes and oxygen is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 The working principle diagram of the online measurement system for molten iron weight of a blast furnace provided by the present invention;

[0038] Figure 2 It is a structural schematic diagram of the weighing box in the present invention;

[0039] Figure 3 For the present invention Figure 2 Schematic diagram of the AA section structure.

[0040] In the figure:

[0041] 1. Weighing box; 2. On-site wiring box; 3. On-board instrument; 4. Display screen in front of furnace; 5. System acquisition PLC;

[0042] 11. Load-bearing beam assembly; 12. Weighing pressure head; 13. Limit stopper; 14. Weighing sensor; 15. Bottom plate assembly; 16. Wedge-shaped limiter; 17. Second limit stopper. DETAILED DESCRIPTION

[0043] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific preferred embodiments.

[0044] In the description of the present invention, it should be understood that the terms "left side", "right side", "upper part", "lower part" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. "First", "second" and the like do not indicate the importance of the components, and therefore cannot be understood as limiting the present invention. The specific dimensions used in this embodiment are only for illustrating the technical solution, and do not limit the scope of protection of the present invention.

[0045] like Figure 1-3 As shown, a blast furnace molten iron weight online measurement system comprises:

[0046] The weighing box 1 located on the frame is used to place the molten iron ladle. A weighing sensor 14 is installed in the inner cavity of the weighing box 1 to obtain the mass of the molten iron ladle and the molten iron inside;

[0047] The field junction box 2 located on the vehicle frame is used to supply power to the weighing sensor 14 and receive signals, and collect and convert the four received signals to achieve the function of four to one. In this embodiment, the field junction box 2 is used in an ambient temperature range of -20 to 70°C. The outer shell is made of 304 stainless steel, which is rainproof and dustproof, and is suitable for use in harsh environments.

[0048] The vehicle-mounted instrument 3 includes a vehicle-mounted screen for displaying weight and a transmitter controller, the vehicle-mounted screen is electrically connected to the transmitter controller, and the transmitter controller is communicatively connected to the field wiring box 2, wherein the transmitter controller obtains the integrated data of the field wiring box 2 and displays it in real time on the vehicle-mounted screen;

[0049] The furnace front display screen 4 located on one side of the blast furnace is paired with the nearby on-board instrument 3 through a Bluetooth module. The furnace front display screen 4 receives and displays the paired molten iron car on-board screen quality data; in this embodiment, the furnace front display screen 4 adopts a current loop transmission method; use environment: temperature range is -20 to 70°C; working voltage is AC220V; its external dimensions correspond to width, height, and thickness of 860mm, 305mm, and 100mm, respectively, and the display character height is 205mm; by directly displaying the weighing data on the vehicle in front of the furnace, it is convenient for on-site workers to view it. This large display is composed of multiple high-brightness light-emitting diodes in parallel, and will not cause data display loss due to damage to one or several of the light-emitting diodes, thereby increasing the service life in harsh industrial environments;

[0050] The system acquisition PLC5 located in the electrical room is placed on the operating computer, which displays the iron output of each molten iron ladle in real time and automatically records it in the system memory.

[0051] As a preferred embodiment of the weighing box 1 in the present invention, it includes a load-bearing beam assembly 11 and a bottom plate assembly 15 located in its inner cavity, the load-bearing beam assembly 11 and the bottom plate assembly 15 are respectively located at the top and bottom of the weighing sensor 14, and the load-bearing beam assembly 11 and the weighing sensor 14 are fixed by a weighing pressure head 12 and a screw combination, and the bottom plate assembly 15 is installed on the frame;

[0052] A wedge-shaped limiter 16 is fixedly connected to the inner side surface of the middle position of the load-bearing beam assembly 11, and a slot matching the wedge-shaped limiter 16 is provided on the side wall of the inner cavity of the weighing box 1, which is used to control the position of the molten iron ladle inside the weighing box 1, so that the molten iron ladle will not be stuck to the frame when loading, causing weighing errors. A first limit stopper 13 is provided on both sides of the top of the load-bearing beam assembly 11, and a second limit stopper 17 is provided on both sides of the top of the inner cavity of the weighing box 1. The ends of the first limit stopper 13 and the second limit stopper 17 are flush, and the outer sides of the first limit stopper 13 and the second limit stopper 17 are both wedge-shaped. The first limit stopper 13 cooperates with the second limit stopper 17 to perform guided limiting, so that the molten iron ladle can be effectively placed on the load-bearing beam assembly 11 when loading, and can achieve rapid positioning, and the stability and safety are significantly improved, reducing the possibility of hitting the wall and shaking, and further improving the accuracy of weighing.

[0053] Furthermore, in the above technical solution, when the hot metal ladle and the hot metal contained therein are weighed, the weighing effect is determined by the weighing box structure and the performance of the sensor. At least two weighing sensors 14 are installed in each weighing box 1, and the load-bearing beam assembly 11 is horizontally mounted on the sensing ends of the multiple weighing sensors 14, and a buffer sheet is provided between the load-bearing beam assembly 11 and the main structure of the weighing sensor 14;

[0054] The number and installation positions of the weighing pressure heads 12 correspond one-to-one to the multiple weighing sensors 14, and the top of the weighing pressure head 12 protrudes from the upper surface of the load-bearing beam assembly 11;

[0055] In this embodiment, the number of the weighing sensor 14 and the weighing pressure head 12 is specifically set to two, and the two weighing sensors 14 and the weighing pressure head 12 are symmetrically distributed about the center axis of the load-bearing beam assembly 11. In this embodiment, the main technical indicators of the weighing system include:

[0056] Maximum measuring range: 200t; Comprehensive accuracy: ±1%FS; Weighing mode: fixed point, static; Load capacity: 200%FS; Weighing box working temperature: -20~200℃; Power supply voltage: DC24V.

[0057] Furthermore, in the above technical solution, the weighing sensor 14 is detachably connected to the base plate assembly 15 by screws, a mounting groove is reserved on the inner side of the weighing box 1 and located at the top of the load-bearing beam assembly 11, and a lifting ring is threadedly connected to the top of the load-bearing beam assembly 11 and located in the middle position of two adjacent weighing pressure heads 12, which is used for the transfer of the load-bearing beam assembly 11 and its connecting parts.

[0058] Furthermore, in the above technical scheme, the vehicle-mounted instrument 3 also includes a parameter setting module and a debugging module, which are used to adjust system parameters and working environment. The parameters of the vehicle-mounted instrument 3 include: non-linearity: 0.01% F·S; input degree: 0.3μV / d; input signal range: -5mV~40mV; A / D conversion speed: 100 times / second; A / D conversion code number: 1 million codes; display division number: ≤60000 codes; zero point temperature influence: ≤0.2μV / ℃; sensor excitation power supply: voltage DC12V; analog output: 4~20mA; power supply: DC24V; applicable temperature range: -20~65℃; protection level: IP65.

[0059] Further, in the above technical solution, the output end of the transmitter controller is electrically connected to a wireless transmitter function, the input end of the furnace front display screen 4 is electrically connected to a wireless receiving device, and the wireless transmitter function is wirelessly connected to the wireless receiving device, so that the data combined and integrated by the field junction box 2 can be transmitted to the transmitter controller for further processing;

[0060] As another embodiment, the transmitter controller and the furnace front display screen 4 transmit signals through a wireless network data transmitter, and the wireless network data transmitter receives the weight signal from the transmitter controller by wireless, and outputs it to the furnace front display screen 4 through a 4-20mA signal to realize data communication. The main output signal form of the instrument: RS485 and 20mA current loop two-way signal output at the same time; serial data output rate: 1200bit / s, 2400bit / s, 4800bit / s, 9600bit / s; transmission distance: 50m in open area to ensure reliable data reception; working power supply: AC220V; working temperature: -20~65℃.

[0061] Furthermore, in the above technical scheme, solenoid valves are provided at the output end of the molten iron ladle and the input and output ends of the blast furnace. The solenoid valve located on the molten iron ladle is communicatively connected to the transmitter controller, and the solenoid valve located on the blast furnace is communicatively connected to the controller on the side of the display screen 4 in front of the furnace and the system acquisition PLC5.

[0062] Furthermore, in the above technical solution, the on-board instrument 3 is located in the cab of the molten iron car, and the cab pulls the frame to move, the weighing box 1 is detachably connected to the frame, and the molten iron car in the blast furnace area is modified and equipped with online weighing equipment. The loading of molten iron into the molten iron bags is controlled, which solves the problem of flipping bags back and forth in the later production process, and provides a basic guarantee for environmental protection and efficient use of molten iron energy consumption.

[0063] According to the management and use requirements of the weighing system, the weight of molten iron needs to be measured online, and the relevant data must be visible in the car cab. At the same time, during the iron-discharging process in front of the furnace, the operator can control the iron output of the molten iron ladle and switch the iron-discharging ladle position according to the displayed weighing data. The relevant weighing data can also be transmitted to the blast furnace control system. The foreman can see the iron output of each molten iron ladle in real time on the operating computer in the main control room, and automatically record it in the system.

[0064] A working method of an online measurement system for molten iron weight of a blast furnace comprises the following steps:

[0065] S1, drive the molten iron vehicle equipped with the weighing system to the iron-out position of the blast furnace, place an empty molten iron ladle in the installation slot of the weighing box 1, and then connect the input end of the molten iron ladle with the output end of the blast furnace. At this time, the display screen 4 in front of the furnace is paired and connected with the nearby on-board instrument 3 through the Bluetooth module;

[0066] S2, control the solenoid valve on the molten iron ladle and the solenoid valve at the output end of the blast furnace to open, so that the molten iron in the blast furnace can flow into the molten iron ladle, and the bottom of the molten iron ladle acts on the weighing pressure head 12, so that the sensing value of the weighing sensor 14 changes;

[0067] S3, the field junction box 2 obtains the sensing signals of multiple weighing sensors 14 and performs aggregation conversion, and the integrated data is received by the transmission controller and displayed in real time on the vehicle screen;

[0068] The display screen 4 in front of the furnace receives and displays the paired molten iron car on-board screen quality data, and transmits it to the operating computer through the system acquisition PLC5, displays the iron output of each molten iron ladle in real time, and automatically records it in the system memory;

[0069] S4. The driver and the on-site workers can intuitively see the weight of the molten iron in the current ladle according to the data on the display screen 4 in front of the furnace. According to the filling target, they can timely control the ladle pouring operation and close the corresponding solenoid valve, which solves the lag caused by the need to weigh by a floor scale and then control the loading amount according to the data in the prior art, thereby reducing the labor intensity of the workers.

[0070] S5. The driver transfers the precisely measured and filled molten iron bags to the steelmaking workshop and directly pours them into the ladle for production.

[0071] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments are made without departing from the principles and spirit of the present invention, and still fall within the scope of protection of the present invention.

Claims

1. An online measurement system for molten iron weight of a blast furnace, characterized in that: include: A weighing box (1) located on the frame is used to place the molten iron ladle, and a weighing sensor (14) is installed in the inner cavity of the weighing box (1) to obtain the mass of the molten iron ladle and the molten iron inside; The field junction box (2) located on the vehicle frame is used to supply power to the weighing sensor (14) and receive signals, and to collect and convert the four received signals; The vehicle-mounted instrument (3) comprises a vehicle-mounted screen for displaying the weight and a transmitter controller, the vehicle-mounted screen is electrically connected to the transmitter controller, and the transmitter controller is communicatively connected to the field wiring box (2), wherein the transmitter controller obtains integrated data from the field wiring box (2) and displays it in real time on the vehicle-mounted screen; The furnace front display screen (4) located at one side of the blast furnace is paired with the on-board instrument (3) in proximity via a Bluetooth module, and the furnace front display screen (4) receives and displays the paired on-board screen quality data of the molten iron vehicle; The system acquisition PLC (5) located in the electrical room is placed on the operating computer, which displays the iron output of each molten iron ladle in real time and automatically records it in the system memory.

2. The online measurement system for molten iron weight of a blast furnace according to claim 1, characterized in that: The weighing box (1) comprises a load-bearing beam assembly (11) and a bottom plate assembly (15) located in its inner cavity, the load-bearing beam assembly (11) and the bottom plate assembly (15) are respectively located at the top and bottom of the weighing sensor (14), and the load-bearing beam assembly (11) and the weighing sensor (14) are fixed by a weighing pressure head (12) and a screw combination, and the bottom plate assembly (15) is installed on the vehicle frame; A wedge-shaped limit stop (16) is fixedly connected to the inner side surface at the middle position of the load-bearing beam assembly (11), and a slot matching the wedge-shaped limit stop (16) is provided on the inner side wall of the weighing box (1) for controlling the position of the molten iron ladle inside the weighing box (1). First limit stops (13) are provided on both sides of the top of the load-bearing beam assembly (11), and second limit stops (17) are provided on both sides of the top of the inner side of the weighing box (1). The ends of the first limit stop (13) and the second limit stop (17) are flush, and the outer side surfaces of the first limit stop (13) and the second limit stop (17) are both wedge-shaped.

3. A blast furnace molten iron weight online measurement system according to claim 2, characterized in that: At least two weighing sensors (14) are installed in each weighing box (1), and a load-bearing beam assembly (11) is horizontally mounted on the sensing ends of the plurality of weighing sensors (14), and a buffer sheet is provided between the load-bearing beam assembly (11) and the main structure of the weighing sensor (14); The number and installation positions of the weighing pressure heads (12) correspond one-to-one to the plurality of weighing sensors (14), and the tops of the weighing pressure heads (12) protrude from the upper surface of the load-bearing beam assembly (11).

4. The on-line measurement system for molten iron weight of a blast furnace according to claim 2, characterized in that: The weighing sensor (14) is detachably connected to the base plate assembly (15) by means of screws; a mounting groove is reserved inside the weighing box (1) and located at the top of the load-bearing beam assembly (11); a lifting ring is threadedly connected to the top of the load-bearing beam assembly (11) and located at the middle position of two adjacent weighing pressure heads (12) for transferring the load-bearing beam assembly (11) and its connecting parts.

5. The online measurement system for molten iron weight of a blast furnace according to claim 1, characterized in that: The vehicle-mounted instrument (3) also includes a parameter setting module and a debugging module, which are used for adjusting system parameters and working environment.

6. The on-line measurement system for molten iron weight of a blast furnace according to claim 1, characterized in that: The output end of the transmitter controller is electrically connected to a wireless transmitter function, the input end of the furnace front display screen (4) is electrically connected to a wireless receiver, and the wireless transmitter function is wirelessly connected to the wireless receiver.

7. The on-line measurement system for molten iron weight of a blast furnace according to claim 1, characterized in that: The output end of the molten iron ladle and the input and output ends of the blast furnace are all provided with electromagnetic valves. The electromagnetic valve located on the molten iron ladle is communicatively connected to the transmission controller, and the electromagnetic valve located on the blast furnace is communicatively connected to the controller on one side of the display screen (4) in front of the furnace and the system acquisition PLC (5).

8. The on-line measurement system for molten iron weight of a blast furnace according to claim 1, characterized in that: The on-board instrument (3) is located in the driving cab of the molten iron vehicle, and the driving cab pulls the vehicle frame to move, and the weighing box (1) is detachably connected to the vehicle frame.

9. A method for measuring the weight of molten iron in a blast furnace according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1, driving the molten iron vehicle equipped with a weighing system to the iron-out position of the blast furnace, placing an empty molten iron ladle in the installation slot of the weighing box (1), and then docking the input end of the molten iron ladle with the output end of the blast furnace, at which time the furnace front display screen (4) is paired and connected with the nearby on-board instrument (3) through a Bluetooth module; S2, control the electromagnetic valve on the molten iron ladle and the electromagnetic valve at the output end of the blast furnace to open, so that the molten iron in the blast furnace can flow into the molten iron ladle, and the bottom of the molten iron ladle acts on the weighing pressure head (12), so that the sensing value of the weighing sensor (14) changes; S3, the field junction box (2) obtains the sensing signals of the plurality of weighing sensors (14) and performs a collection and conversion, and the integrated data is received by the transmission controller and displayed in real time on the vehicle screen; The display screen (4) in front of the furnace receives and displays the paired molten iron car on-board screen quality data, and transmits it to the operating computer through the system acquisition PLC (5), displays the iron output of each molten iron ladle in real time, and automatically records it in the system memory; S4. The driver and the on-site workers can intuitively see the weight of the molten iron in the ladle according to the data on the display screen (4) in front of the furnace, and control the ladle emptying operation in time according to the filling target, and close the corresponding solenoid valve; S5. The driver transfers the precisely measured and filled molten iron bags to the steelmaking workshop and directly pours them into the ladle for production.

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