Electric furnace steelmaking buggy ladle control system

Abstract

The invention relates to an electric furnace steelmaking buggy ladle control system, and belongs to the technical field of electric furnace steelmaking equipment. According to the technical scheme, a hardware control module (1) takes a frequency converter as a core driving unit, is provided with a variable frequency motor (10), a motor band-type brake device (11) and an encoder, is integrated with a weighing sensor (14) and a laser ranging device (16), and is further provided with a sound-light alarm device (12), and the weighing sensor (14) and the sound-light alarm device (12) form a linkage safety control loop; the software control module is provided with a plurality of operation terminals, and the multiple operation terminals are of a distributed control architecture. The method has the beneficial effects that the control accuracy is high, and the positioning precision is improved; a linkage alarm mechanism can prevent overload, abnormal vibration and brake failure risks, and the safety performance is enhanced; the multi-station cooperation requirement can be met; the variable-frequency speed regulation and torque compensation technology reduces energy consumption, meets the requirement for heavy-load stable starting, and is energy-saving and efficient.

Description

Technical Field

[0001] This invention relates to a ladle car control system for electric arc furnace steelmaking, belonging to the technical field of electric arc furnace steelmaking equipment. Background Technology

[0002] In electric arc furnace steelmaking, the ladle car plays a crucial role in the transfer of molten steel, and its accuracy and safety directly impact production efficiency and equipment lifespan. Traditional ladle car control systems suffer from the following problems: The positioning accuracy is low, relying on manual operation and lacking encoder feedback, resulting in parking errors often exceeding 20mm, leading to molten steel splashing or docking misalignment. There are significant safety hazards; the lack of real-time monitoring of overload, abnormal vibration, and other operating conditions easily causes equipment damage or production accidents. Coordination is poor; the operating terminals at each workstation are isolated, making rapid switching between remote and local control impossible, and emergency response speed is insufficient. The level of automation is low, with a narrow speed range and poor braking performance, making it difficult to adapt to the dynamic needs of different process stages. Summary of the Invention

[0003] The purpose of this invention is to provide a control system for ladle cars in electric arc furnace steelmaking. By employing a dual-redundant closed-loop control scheme using both an encoder and a laser rangefinder, the system achieves high control accuracy and improved positioning precision. A linkage alarm mechanism prevents risks of overload, abnormal vibration, and brake failure, enhancing safety performance. The distributed control architecture supports seamless switching between remote monitoring and local operation, meeting the needs of multi-station collaboration. Variable frequency speed regulation and torque compensation technologies reduce energy consumption, adapting to the requirements of smooth start-up under heavy loads, achieving energy efficiency and effectively solving the aforementioned problems in the background technology.

[0004] The technical solution of the present invention is: a control system for a ladle car in electric arc furnace steelmaking, comprising a hardware control module. The hardware control module uses a frequency converter as the core drive unit and is equipped with a frequency converter motor, a motor brake device and an encoder. It integrates a weighing sensor and a laser rangefinder device and is also equipped with an audible and visual alarm device. The frequency converter motor is installed on the drive shaft of the ladle car, the encoder is installed on the wheel axle end of the ladle car, the electrode brake device, the weighing sensor and the audible and visual alarm device are installed on the body of the ladle car, and the laser rangefinder device is installed on the track of the ladle car. The weighing sensor and the audible and visual alarm device constitute a linkage safety control loop. The hardware control module connects to multiple operating terminals, including a remote HMI operating terminal, a steel tapping station operating terminal, an argon station operating terminal, a cover-opening / removing station operating terminal, and a steel loading / removing station operating terminal connected via an industrial control network. The steel tapping station operating terminal is located in the steel tapping control room, the argon station operating terminal is located in the argon station control room, and the steel loading / removing station operating terminal is located at the cover-opening / removing station and the steel loading / removing station, respectively, next to the ladle car track. The multiple operating terminals adopt a distributed control architecture, with data synchronization between terminals via PROFINET industrial Ethernet, and have hierarchical management functions for operating permissions. The remote HMI operating terminal has the highest control priority. The steel tapping station operating terminal, argon station operating terminal, cover-opening / removing station operating terminal, and steel loading / removing station operating terminal share the control screen of the remote HMI operating terminal and are equipped with an emergency mode switching button.

[0005] The frequency converter is equipped with a wide-band speed control module, which supports stepless speed regulation and provides torque compensation function in the low-speed range.

[0006] The hardware control module is also connected to a vibration detection device, which includes a triaxial accelerometer and a spectrum analysis unit installed on the steel ladle car frame.

[0007] The industrial control network adopts a ring topology, and the PLC network module in the hardware control module has a built-in dual-channel redundant communication module.

[0008] The electrode brake device adopts an electromagnetic-hydraulic composite braking mechanism, which includes a normally closed electromagnetic brake, a hydraulic compensation braking unit, and a brake pad temperature monitoring module.

[0009] It also includes a ladle cover detection device, which consists of a laser scanner and a vision recognition unit. The laser scanner is installed on the top of the ladle car and matches the position of the ladle cover. The laser scanner is connected to the vision recognition unit, which is connected to the hardware control module.

[0010] The beneficial effects of this invention are as follows: by adopting a dual-redundant closed-loop control scheme using a ladle car encoder and a laser rangefinder, the control accuracy is high and the positioning accuracy is improved; the linkage alarm mechanism can prevent the risks of overload, abnormal vibration and brake failure, thus enhancing safety performance; the distributed control architecture supports seamless switching between remote monitoring and local operation, which can meet the needs of multi-station collaboration; the frequency conversion speed regulation and torque compensation technology reduce energy consumption, adapt to the needs of heavy-load smooth start-up, and are energy-saving and efficient. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the system connection of the present invention; Figure 2 This is a structural block diagram of the present invention; The diagram shows: Hardware control module 1, PLC power supply and CPU control module 2, PLC network module 3, PLC digital input module 4, PLC digital output module 5, PLC analog input module 6, PLC analog output module 7, frequency converter 8, switch 9, variable frequency motor 10, electrode brake device 11, audible and visual alarm device 12, steel loading position 13, weighing sensor 14, vibration detection device 15, laser rangefinder 16, ladle cover detection device 17, steel tapping platform operation terminal 18, argon station operation terminal 19, cover opening and closing position operation terminal 20, steel loading position operation terminal 21, industrial control network 22, ladle 23, ladle car 24, electrical room 25, steel tapping operation room 26, hydrogen station operation room 27, steel tapping position 28, hydrogen station position 29, cover opening and closing position 30. Detailed Implementation

[0012] To make the purpose, technical solutions, and advantages of the invention's embodiments clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only a small part of the embodiments of the present invention, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0013] A control system for a ladle car in electric arc furnace steelmaking includes a hardware control module 1. The hardware control module 1 uses a frequency converter 8 as the core drive unit and is equipped with a frequency converter motor 10, a motor brake device 11, and an encoder. It integrates a weighing sensor 14 and a laser rangefinder 16, and also has an audible and visual alarm device 12. The frequency converter motor 10 is installed on the drive shaft of the ladle car, the encoder is installed on the wheel axle end of the ladle car, the electrode brake device 11, the weighing sensor 14, and the audible and visual alarm device 12 are installed on the body of the ladle car, and the laser rangefinder 16 is installed on the track of the ladle car. The weighing sensor 14 and the audible and visual alarm device 12 constitute a linkage safety control loop. The hardware control module 1 connects to multiple operating terminals, including a remote HMI operating terminal, a steel tapping station operating terminal 18, an argon station operating terminal 19, a cover-opening station operating terminal 20, and a steel loading station operating terminal 21, all connected via an industrial control network 22. The steel tapping station operating terminal 18 is located in the steel tapping control room, the argon station operating terminal 19 is located in the argon station control room, and the steel loading station operating terminal 20 and the steel loading station operating terminal 21 are located at the cover-opening station and the steel loading station, respectively, next to the ladle car track. The multiple operating terminals adopt a distributed control architecture, with data synchronization between terminals via PROFINET industrial Ethernet, and have hierarchical management functions for operating permissions. The remote HMI operating terminal has the highest control priority. The steel tapping station operating terminal 18, the argon station operating terminal 19, the cover-opening station operating terminal 20, and the steel loading station operating terminal 21 share the control screen of the remote HMI operating terminal and are equipped with an emergency mode switching button.

[0014] The frequency converter is equipped with a wide-band speed control module, which supports stepless speed regulation and provides torque compensation function in the low-speed range.

[0015] The hardware control module 1 is also connected to a vibration detection device 15, which includes a triaxial accelerometer and a spectrum analysis unit installed on the steel ladle car frame.

[0016] The industrial control network adopts a ring topology, and the PLC network module in hardware control module 1 has a built-in dual-channel redundant communication module.

[0017] The electrode brake device 11 adopts an electromagnetic-hydraulic composite braking mechanism, which includes a normally closed electromagnetic brake, a hydraulic compensation braking unit, and a brake pad temperature monitoring module.

[0018] It also includes a ladle cover detection device 17, which includes a laser scanner and a vision recognition unit. The laser scanner is installed on the top of the ladle car and matches the position of the ladle cover. The laser scanner is connected to the vision recognition unit, which is connected to the hardware control module 1.

[0019] In practical applications, this invention includes both hardware and software components.

[0020] The hardware component includes a hardware control module 1, a variable frequency motor control module, a process detection and control module, and multiple operation terminals.

[0021] The hardware control module 1 consists of a PLC power supply and CPU control module 2, a PLC network module 3, a PLC digital input module 4, a PLC digital output module 5, a PLC analog input module 6, and a PLC analog output module 7.

[0022] The PLC power supply module of PLC power supply and CPU control module 2 provides power, while the CPU performs intelligent logic control. PLC network module 3 connects to switch 9 for network communication, and connects to industrial control network 22 through switch 9 to realize real-time data interaction with frequency converter 8, host computer and operation terminal. PLC digital input module 4, PLC digital output module 5, PLC analog input module 6, and PLC analog output module 7 are respectively connected to digital signals and analog information to perform input and output control of control signals.

[0023] The PLC digital input module 4 receives switching signals, including brake status, alarm signals, and operation terminal indications. PLC digital output module 5 controls the start and stop of the frequency converter, the release of the electrode brake device, and the triggering of the audible and visual alarm device. The PLC analog input module 6 acquires analog signals from the weighing sensor 14, the laser rangefinder 16, the encoder, and the vibration detection device 15. PLC analog output module 7 outputs variable frequency speed control commands to frequency converter 8; The variable frequency motor control module includes a variable frequency motor 10 installed on the ladle car to drive the ladle car; an electrode brake device 11 installed on the ladle car to control the braking of the ladle car; an audible and visual alarm device 12 installed on the ladle car to control the overload and travel of the ladle car; and a frequency converter 8 installed in the electrical room to control the speed regulation of the motor and the travel of the car.

[0024] The variable frequency motor 10 is installed on the drive shaft of the ladle car and achieves stepless speed regulation of 0.1~1.5m / s through the frequency converter 8; The electrode brake device 11 adopts a combination of electromagnetic braking and hydraulic compensation, with a response time of ≤50ms; The audible and visual alarm device 12 triggers a three-level alarm (early warning, serious alarm, emergency braking) when overloaded or malfunctioning. The process detection and control module includes an encoder, a weighing detection module, a vibration detection device 15, a laser rangefinder 16, and a ladle cover detection device 17.

[0025] The encoder is installed on the end of the steel ladle wheel axle to collect wheel rotation pulse signals in real time. The weighing detection module consists of a weighing sensor 14 and a signal conditioner, and is connected to the PLC analog input module 6, with an accuracy of ±0.5%. The laser rangefinder 16 is arranged along the ladle car track and achieves millimeter-level absolute positioning through rangefinder technology. The multi-operation terminal consists of a steel tapping station operation terminal 18, an argon station operation terminal 19, a cover opening and closing position operation terminal 20, and a steel loading position operation terminal 21.

[0026] Among them, the steel tapping platform operation terminal 18 is located in the steel tapping operation room, the argon station operation terminal 19 is located in the argon station operation room, the cover lifting position operation terminal 20 and the steel loading position operation terminal 21 are located next to the ladle car track. All of the above operation terminals are connected to the switch 9 through optical fiber and Ethernet cable, and enter the PLC control network to support ladle car travel control, speed adjustment and manual / automatic mode switching.

[0027] The software component includes an industrial control network 22, a host computer HMI control module, a PLC control algorithm module, and an operator terminal control module.

[0028] The industrial control network 22 includes a PLC control network, a frequency converter control network, and a host computer HMI network.

[0029] The host computer (HMI) control module includes a ladle car real-time monitoring module, a ladle car control module, a ladle car control alarm module, a ladle car trend module, a ladle car report module, a ladle car data acquisition module, and a ladle car fault interlock control module. The real-time monitoring module provides real-time monitoring of the ladle car, allowing for real-time understanding of its operating status. The ladle car control module enables intelligent control of the ladle car; the alarm model provides abnormal alarms; the trend module allows for historical trend queries; the report module records the ladle car's operating status; the data acquisition module uploads data such as steel output and location from the ladle car to the secondary production and sales system for integrated intelligent data management; and the fault interlock control module provides fault escalation and safety control interlocks to ensure the inherent safety of the ladle car control.

[0030] The PLC control algorithm module implements the PLC logic judgment and execution for the motion control of the ladle car, including the ladle car positioning precision algorithm control module, the ladle car fault diagnosis control algorithm module, the ladle car walking control algorithm module, and the ladle car frequency converter speed regulation control algorithm module.

[0031] The ladle car positioning precision algorithm control module processes the absolute position signal from the laser rangefinder 16 and the relative displacement signal from the encoder detection module in real time, realizing precise positioning and fault diagnosis of the ladle car. By integrating the absolute position of the laser rangefinder and the relative displacement of the encoder, fuzzy PID control is used to achieve a parking error of ≤50mm.

[0032] The precise positioning algorithm control module for the ladle car adopts a control strategy combining fuzzy PID control and position prediction compensation. Specific steps include: S1. Based on the laser ranging device, establish an absolute positioning reference for the orbital coordinate system; S2. Calculate the real-time displacement of the ladle car by detecting the pulse signal from the encoder detection module; S3. When the ladle car approaches the target location range, the deceleration prediction model is activated to dynamically adjust the inverter output frequency. S4. In the final positioning stage, switch to incremental PID closed-loop control, combined with motor brake control, to achieve a parking position error of ≤50mm.

[0033] The ladle car fault diagnosis and control algorithm module realizes the detection and control of ladle car operation faults, and generates fault codes based on weighing data fluctuations, vibration spectrum characteristics and inverter status parameters; The ladle car travel control algorithm module implements the forward, reverse, and stop control functions of the ladle car. The ladle car frequency converter speed control algorithm module implements the frequency converter debugging control function of the ladle car, dynamically adjusting the output frequency according to the target speed and real-time load, and enabling torque compensation in the low-speed range (≤0.5m / s). The operation terminal control module realizes the automatic switching control function and emergency control function of the ladle car, and mainly realizes the machine-side operation next to the ladle car track.

[0034] The manual / automatic switching function supports priority hierarchy of operation terminals at each workstation (remote HMI > local terminal > on-site operation). The emergency control function enables control takeover and global status synchronization within 300ms after an emergency stop is triggered on the local terminal.

[0035] The software connects to remote HMI operation terminals, electric furnace tapping station operation terminals, argon station operation terminals, cover opening and closing operation terminals, and steel loading operation terminals via an industrial control network. Each operation terminal is equipped with a manual / automatic mode switching module and steel ladle car forward, backward, and stop control functions. The terminals share the functions of the host computer's HMI control module.

[0036] The weighing detection module and the audible and visual alarm device form a linked safety control loop. The specific implementation steps are as follows: S1. When the actual load on the ladle exceeds the rated value by 10%, a level three audible and visual alarm is triggered and the inverter start signal is locked. S2. When the load fluctuation amplitude exceeds the preset threshold for 5 consecutive seconds, the vibration abnormality alarm is activated and emergency braking is performed. S3. In automatic operation mode, the weighing data is dynamically matched with the process parameters of the target station, and the maximum allowable operating speed is automatically corrected.

[0037] The multi-operation terminal adopts a distributed control architecture, and the terminals synchronize data through PROFINET industrial Ethernet. It also has a hierarchical management function for operation permissions. The remote host computer HMI control module of the steel tapping station operation terminal has the highest control priority. The local operation terminal is equipped with an emergency mode switching button, which can take over control within 300ms. All terminals share the control screen of the remote host computer HMI control module, which displays the speed, position, load and equipment status indicators of the ladle car in real time.

[0038] The inverter 8 is equipped with a wide-band speed control module, which supports stepless speed regulation and provides torque compensation function in the low-speed range to ensure smooth start-up under heavy load conditions.

[0039] It also includes a vibration detection device 15, which includes a triaxial accelerometer and a spectrum analysis unit mounted on the chassis. When abnormal vibration at a characteristic frequency is detected, it automatically generates an equipment maintenance warning and records the fault characteristic spectrum.

[0040] The industrial control network 33 adopts a ring topology. The PLC network module has a built-in dual-channel redundant communication module, which automatically switches to the wireless backup link in the event of a network failure to maintain basic control functions.

[0041] This invention is implemented in the electric furnace steel tapping process: S1. Automatically plan the ladle car's movement trajectory based on the target weight of molten steel; S2. Dynamically adjust the position of the ladle car during the steel tapping process to compensate for the positioning deviation caused by the impact of the steel flow; S3. After the steel tapping is completed, a process record report is automatically generated, which includes the start time of steel tapping, the end time of steel tapping, the duration of steel tapping, the amount of steel tapped, the gross weight of molten steel, the accuracy of molten steel, and the ladle distance measurement signal.

[0042] The motor-driven brake device 11 employs an electromagnetic-hydraulic composite braking mechanism, comprising a normally closed electromagnetic brake with a response time ≤50ms; a hydraulic compensation braking unit that automatically applies compensating braking force when a slippage distance exceeds 20mm; and a brake pad temperature monitoring module that activates a forced air cooling device when the temperature exceeds 120℃. The composite braking process is as follows: upon receiving a stop command, the normally closed electromagnetic brake (response time ≤30ms) activates first; if a slippage distance L > 20mm is detected, the hydraulic compensation braking unit applies additional braking force, with the brake pad pressure increasing linearly according to P = 10 × slippage distance L; after braking is completed, the brake pad temperature monitoring module activates forced air cooling to ensure the brake pad temperature is ≤80℃.

[0043] The ladle cover detection device 17 includes a laser scanner and a vision recognition module. The laser scanning unit is installed on the top of the ladle car to scan the outline of the ladle cover. The vision recognition unit captures the closed image of the cover through an industrial camera and uses an edge detection algorithm to determine the closure status. When the cover is detected to be not fully closed, the ladle car is prohibited from entering the high-speed operation mode, the speed of the ladle car is limited to ≤0.3m / s, and an alarm prompt is triggered on the HMI interface.

[0044] The specific steps for achieving precise positioning in this invention include: S1. Initialization phase: The laser detection module establishes the reference zero point of the track coordinate system, the laser ranging device monitors the position signal in real time, and the ladle car encoder detection module corrects in real time to ensure the position detection accuracy. S2, Coarse Positioning Stage: The ladle car frequency converter drives the ladle car with a 0-50Hz energized motor, and dynamically corrects the encoder's cumulative error based on laser ranging data; S3, Precision Positioning Stage: When the distance to the target position is 2m, the deceleration prediction model is activated, and the inverter output frequency is dynamically adjusted; S3, Closed-loop control stage: When the distance is ≤0.5m, switch to incremental PID control, and combine with the holding brake to achieve a final positioning error of ≤50mm.

[0045] The fault diagnosis of this invention includes the following steps: S1. Overload Diagnosis: When the weighing data exceeds the rated load by 10% for 5 seconds, it is determined to be an overload fault, triggering a level 3 alarm and locking the drive; S2. Vibration Anomaly Diagnosis: The vibration detection device collects triaxial acceleration signals and analyzes the spectral characteristics through FFT. If an abnormal frequency band of 15Hz~50Hz is detected and the amplitude is ≥0.5g, it is determined to be a foreign object in the track or a damaged bearing. S3. Brake failure diagnosis: After the brake release command is issued, if the encoder detects a displacement of >3mm, it is determined to be a runaway fault and the hydraulic compensation brake is activated.

[0046] The redundant communication implementation method of industrial control network 22 is as follows: the main communication channel adopts the PROFINET protocol with a transmission cycle of ≤10ms; the backup channel adopts a wireless network, which automatically switches when the optical fiber breaks, ensuring that the transmission delay of critical control commands is ≤100ms; the network status is displayed in real time on the host computer HMI interface, and a topology alarm is triggered when a fault occurs.

[0047] The data acquisition and report generation process of the host computer HMI control module is as follows: Real-time data collection of ladle car positioning, load capacity, and operating speed; data is uploaded to the MES system via the industrial control network to generate standardized reports containing time information, process parameters, and operation records; reports support multi-dimensional retrieval by time, workstation, and fault type, and are linked with the production planning system to optimize scheduling.

[0048] The torque compensation method of the variable frequency speed control algorithm is as follows: In the low speed range, based on the real-time load data of the weighing sensor, the output torque of the frequency converter is dynamically adjusted according to the formula: compensation coefficient = 1 + 0.2 × (actual load / rated load); after compensation, the speed fluctuation rate in the low speed range is ≤ ±2%, and the success rate of heavy load start is ≥ 99.5%.

[0049] The priority logic for manual / automatic switching is as follows: The remote HMI operation interface has the highest control authority and can override local terminal commands; local terminals (steel tapping station operation terminal 18, argon station operation terminal 19, cover opening and closing position operation terminal 20, steel loading position operation terminal 21) automatically become the highest priority after an emergency stop is triggered; when control authority is switched, the system automatically synchronizes the status view of each terminal to avoid command conflicts.

[0050] Specific applications in the electric arc furnace steelmaking tapping process include: before tapping, automatically calculating the optimal stopping position of the ladle car based on the target weight of the molten steel; during the tapping process, real-time compensation for positioning offset caused by the impact of the steel flow (compensation amount = 0.5 × molten steel flow rate × time); after tapping, generating a process report containing actual load capacity, positioning accuracy, and energy consumption data.

[0051] As can be seen from the above, this invention enables millimeter-level precise positioning of the ladle car on the track based on laser ranging data and encoder feedback signals; the motor speed is adjusted in real time by the frequency converter, and the braking system ensures that the stopping position error is ≤50mm. The integrated design of the weighing sensor and the audible and visual alarm device automatically triggers the audible and visual alarm and restricts startup when the ladle weight exceeds the rated load or abnormal vibration occurs during operation, effectively avoiding the risk of overload operation. The collaborative control architecture of multiple operating terminals supports seamless switching between remote monitoring and local emergency operation, meeting the needs of efficient connection of multiple processes such as electric furnace tapping, molten steel refining, and continuous casting, significantly improving the automation level of the steelmaking production line.

[0052] This invention, through its integrated design of frequency converter drive, multi-sensor fusion, and multi-terminal operation, boasts advantages such as high positioning accuracy (±50mm), wide speed range (0~50Hz), and reliable safety performance. It can realize real-time display of ladle car operation status, intelligent fault diagnosis, and standardized operation procedures, effectively reducing the intensity of manual operation and improving the continuity and safety of electric arc furnace steelmaking processes. It is suitable for the intelligent transformation and upgrading of various electric arc furnace steelmaking production lines.

Claims

1. A control system for a ladle car in electric arc furnace steelmaking, characterized in that: The system includes a hardware control module (1), which uses a frequency converter (8) as the core drive unit and is equipped with a frequency converter motor (10), a motor brake device (11) and an encoder. It integrates a weighing sensor (14) and a laser rangefinder device (16), and is also equipped with an audible and visual alarm device (12). The frequency converter motor (10) is installed on the drive shaft of the ladle car, the encoder is installed on the wheel axle end of the ladle car, the electrode brake device (11), the weighing sensor (14) and the audible and visual alarm device (12) are installed on the body of the ladle car, and the laser rangefinder device (16) is installed on the track of the ladle car. The weighing sensor (14) and the audible and visual alarm device (12) constitute a linkage safety control loop. The hardware control module (1) is connected to multiple operation terminals, which include a remote HMI operation terminal, a steel tapping station operation terminal (18), an argon station operation terminal (19), a cover-lifting station operation terminal (20), and a steel loading station operation terminal (21) connected through an industrial control network (22). The steel tapping station operation terminal (18) is located in the steel tapping operation room, the argon station operation terminal (19) is located in the argon station operation room, and the steel loading station operation terminal (20) and the steel loading station operation terminal (21) are located at the cover-lifting station and the steel loading station next to the ladle car track, respectively. The multiple operation terminals are distributed control architectures, and the terminals are synchronized with each other through PROFINET industrial Ethernet and have hierarchical management functions for operation permissions. The remote HMI operation terminal has the highest control priority. The steel tapping station operation terminal (18), the argon station operation terminal (19), the cover-lifting station operation terminal (20), and the steel loading station operation terminal (21) share the control screen of the remote HMI operation terminal and are equipped with an emergency mode switching button.

2. The electric arc furnace steelmaking ladle car control system according to claim 1, characterized in that: The inverter (8) is equipped with a wide-band speed regulation module, which supports stepless speed regulation and provides torque compensation function in the low-speed range.

3. The electric arc furnace steelmaking ladle car control system according to claim 1, characterized in that: The hardware control module (1) is also connected to a vibration detection device (15), which includes a triaxial accelerometer and a spectrum analysis unit installed on the steel ladle car frame.

4. The electric arc furnace steelmaking ladle car control system according to claim 1, characterized in that: The industrial control network adopts a ring topology, and the PLC network module in the hardware control module (1) has a built-in dual-channel redundant communication module.

5. The electric arc furnace steelmaking ladle car control system according to claim 1, characterized in that: The electrode brake device (11) adopts an electromagnetic-hydraulic composite braking mechanism, which includes a normally closed electromagnetic brake, a hydraulic compensation braking unit and a brake pad temperature monitoring module.

6. The electric arc furnace steelmaking ladle car control system according to claim 1, characterized in that: It also includes a ladle cover detection device (17), which includes a laser scanner and a vision recognition unit. The laser scanner is installed on the top of the ladle car and matches the position of the ladle cover. The laser scanner is connected to the vision recognition unit, which is connected to the hardware control module (1).

Images