Electric furnace steelmaking waste steel feeding control system and method

Abstract

The invention relates to an electric furnace steelmaking waste steel feeding control system and method, and belongs to the technical field of electric furnace short-process production equipment and methods in the metallurgical industry. According to the technical scheme, an electrode power supply control system, an oxygen supply and carbon spraying control system and a feeding control system are connected with an electric furnace smelting control module; the trough control system is connected with the trough control module; and the chain plate machine SCADA data acquisition and monitoring control system operation station, the chain plate machine database server and the chain plate machine PLC control system are connected with the control system. The method has the beneficial effects that by adopting a chain plate machine scrap steel feeding mode, the feeding speed of the chain plate machine is controlled according to the steelmaking production rhythm and the trough speed, and the conditions of material stacking and material clamping are avoided; stacking control based on the video recognition technology is adopted, stacking of the chain plate machine is avoided, the low-efficiency operation time of the chain plate machine is shortened, and green, efficient and low-cost operation of short-process steelmaking production is guaranteed.

Description

Technical Field

[0001] The present invention relates to a control system and method for scrap charging in electric furnace steelmaking, belonging to the technical field of short-process production equipment and methods for electric furnaces in the metallurgical industry. Background Art

[0003] The Consteel electric furnace generally operates continuously with continuous charging. Especially for all-scrap smelting, it requires a fast scrap charging speed to meet the smelting production demand. Such electric furnaces mostly adopt chain conveyors for scrap charging and transportation. In actual production, due to the different demands for scrap charging into the furnace at different smelting stages of the electric furnace, it is very easy to occur that the chain conveyor charges scrap too fast, resulting in stockpiling, or even causing material jamming in the Consteel system, affecting production; or the chain conveyor charges scrap too slowly, resulting in the emptying of the hopper and affecting the production rhythm of the electric furnace.

[0004] At the same time, in the process of steel smelting, as an important smelting equipment, the scrap charging efficiency and accuracy of the Consteel electric furnace directly affect the smelting efficiency and product quality. Traditional scrap charging systems mostly rely on manual operation or simple mechanical control, having problems such as unstable charging speed, easy accumulation, and slow response. With the development of automation and intelligent technologies, it is particularly important to develop a scrap charging system that can intelligently adjust the charging speed and automatically identify and solve the problem of steel stockpiling. Summary of the Invention

[0005] The purpose of the present invention is to provide a control system and method for scrap charging in electric furnace steelmaking. By adopting the mode of scrap charging with a chain conveyor, the charging speed of the chain conveyor is controlled according to the steelmaking production rhythm and the hopper speed, avoiding the situation that the hopper stops feeding while the chain conveyor continues to charge, until stockpiling and material jamming occur; adopting stockpiling control based on video recognition technology to avoid stockpiling of the chain conveyor, reducing the inefficient operation time of the chain conveyor, and ensuring the green, efficient, and low-cost operation of short-process steelmaking production, effectively solving the above problems existing in the background art.

[0006] The technical solution of the present invention is: A control system for scrap charging in electric furnace steelmaking includes an electric furnace, a hopper, a chain conveyor, and a control system. The control system includes an electric furnace smelting control module, a hopper control module, a chain conveyor charging control module, a stockpiling image recognition module, and a chain conveyor control module; The electric furnace includes an electric furnace body, electrodes, an oxygen supply and carbon injection lance, and a charging device. The electrodes are connected to an electrode power supply control system, the oxygen supply and carbon injection lance is connected to an oxygen supply and carbon injection control system, the charging device is connected to a charging control system, and the electrode power supply control system, the oxygen supply and carbon injection control system, and the charging control system are connected to the electric furnace smelting control module through an electric furnace network system; The charging trough includes a connecting trolley, a preheating section, and a feeding section. The feeding section is connected to the connecting trolley through the preheating section. The connecting trolley realizes the final addition of scrap steel into the electric furnace body. The connecting trolley is connected to the charging trough control system, and the charging trough control system is connected to the charging trough control module through the charging trough network system; The chain conveyor includes a chain conveyor body, a chain conveyor driving device, and a chain conveyor camera. The chain conveyor camera is arranged above the feeding section. The chain conveyor body is driven by the chain conveyor driving device, and the chain conveyor body is connected to the feeding section; The chain conveyor feeding control module is connected to the chain conveyor frequency converter through the chain conveyor PLC control system. The chain conveyor frequency converter controls the chain conveyor driving device. The stacking material image recognition module is connected to the chain conveyor camera through the chain conveyor SCADA data acquisition and monitoring control system operation station. The chain conveyor control module is connected to the chain conveyor database server. The chain conveyor SCADA data acquisition and monitoring control system operation station, the chain conveyor database server, and the chain conveyor PLC control system are connected to the control system through the chain conveyor network system.

[0007] The electric furnace network system, the charging trough network system, and the chain conveyor network system form an overall network system through the Ethernet network system.

[0008] The control system further includes a chain conveyor alarm control module, a chain conveyor trend management module, a chain conveyor report management module, and a chain conveyor forced control module. The chain conveyor alarm control module, the chain conveyor trend management module, the chain conveyor report management module, and the chain conveyor forced control module are respectively connected to the chain conveyor.

[0009] The chain conveyor is of the structure with an automatic oil pump circulation and one driving motor for normal use and one for standby.

[0010] An electric furnace steelmaking scrap charging control method includes the following steps: (1) Electric furnace smelting control: When the electric furnace is smelting, the electric furnace adds scrap steel into the charging trough through the chain conveyor. The charging and conveying system adds scrap steel into the electric furnace furnace. The alloy and flux are added into the furnace through the charging control system. Strong power supply is carried out by the electrode to melt the scrap steel, and oxygen lance blowing oxygen control and carbon lance spraying carbon control are carried out to complete the smelting of scrap steel into qualified molten steel by the electric furnace; (2) Charging trough feeding speed control: The electric furnace smelts in different stages. The charging trough adjusts the feeding speed according to the rhythm of the electric furnace smelting. The chain conveyor scrap charging controls the chain conveyor speed in stages according to the scrap feeding speed of the charging trough; (3) Chain conveyor feeding control: The operation of the chain conveyor feeding device is controlled by the chain conveyor frequency converter to realize speed regulation control; (4) The chain conveyor control runs in three modes: manual control beside the machine, manual control by the upper computer, and full-automatic control. The maintenance mode adopts manual control beside the machine; In normal production, full-automatic control is adopted, or manual control mode can also be used for scrap feeding control. When in full-automatic control, it operates in a mode where the feeding control of the chain conveyor matches the running speed of the trough, achieving the optimal matching of the feeding speed of the chain conveyor and the feeding speed of the trough.

[0011] In step (3) described above, the chain conveyor operates in a mode of automatic oil pump circulation and one driving motor with one standby, ensuring the stability of scrap feeding of the chain conveyor.

[0012] In step (5) described above, a specific full-automatic control method is as follows: when the feeding speed of the trough is at the lower limit of the feeding speed V1_L = 0% and the upper limit of the feeding speed V1_H = 30%, the speed of the chain conveyor F1 = 0, and the chain conveyor automatically stops feeding; when the feeding speed of the trough is at the lower limit of the feeding speed V2_L = 0% and the upper limit of the feeding speed V2_H = 30%, the speed of the chain conveyor F2 = 10, and the chain conveyor feeds at a speed of 10 HZ; when the feeding speed of the trough is at the lower limit of the feeding speed V3_L = 0% and the upper limit of the feeding speed V3_H = 30%, the speed of the chain conveyor F3 = 15, and the chain conveyor feeds at a speed of 15 HZ; when the feeding speed of the trough is at the lower limit of the feeding speed V4_L = 0% and the upper limit of the feeding speed V4_H = 30%, the speed of the chain conveyor F4 = 20, and the chain conveyor feeds at a speed of 20 HZ; when the feeding speed of the trough is at the lower limit of the feeding speed V5_L = 0% and the upper limit of the feeding speed V5_H = 30%, the speed of the chain conveyor F5 = 30, and the chain conveyor feeds scrap at a speed of 30 HZ.

[0013] In step (5) described above, according to the scrap stacking signal calculated by the stacking image recognition module using big data, the optimal control of the chain conveyor feeding is realized. While ensuring that the feeding speed of the trough follows the rhythm of electric furnace smelting and the feeding speed of the chain conveyor follows the feeding speed of the trough, after the chain conveyor gets the stacking signal of the trough, it controls the feeding of the chain conveyor according to the intensity of the stacking signal.

[0014] When the stacking signal is at the low material level L, the chain conveyor speeds up the feeding speed; when the intensity of the stacking signal is medium and at the medium material level M, the feeding speed of the chain conveyor is appropriately reduced; when the intensity of the stacking signal is high and at the high material level H, the chain conveyor greatly reduces the feeding speed until it stops running.

[0015] The beneficial effects of the present invention are as follows: By adopting the mode of scrap feeding of the chain conveyor and controlling the feeding speed of the chain conveyor according to the steelmaking production rhythm and the speed of the trough, it avoids the situation that the trough stops feeding while the chain conveyor continues to feed, resulting in stacking and jamming of materials; adopting the stacking control based on video recognition technology avoids the occurrence of stacking of the chain conveyor, reduces the inefficient running time of the chain conveyor, and ensures the green, efficient, and low-cost operation of short-process steelmaking production. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is the system structure diagram of the present invention; Figure 2 is the working flow chart of the present invention; In the figure: electric furnace 1, electric furnace body 101, electrode 102, oxygen supply and carbon injection lance 103, feeding device 104, electrode power supply control system 105, oxygen supply and carbon injection control system 106, feeding control system 107, electric furnace network system 108, material tank 2, connecting trolley 201, preheating section 202, feeding section 203, material tank control system 204, material tank network system 205, chain conveyor 3, chain conveyor body 301, chain conveyor drive device 302, chain conveyor frequency converter 303, chain conveyor PLC control system 304, chain conveyor database server 305, chain conveyor SCADA data acquisition and monitoring control system operation station 306, chain conveyor network system 307, chain conveyor camera 308. Specific embodiments

[0017] In order to make the objectives, technical solutions and advantages of the embodiments of the invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments. Obviously, the described embodiments are only a small part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0018] An electric furnace steelmaking scrap charging control system includes an electric furnace 1, a material tank 2, a chain conveyor 3 and a control system. The control system includes an electric furnace smelting control module, a material tank control module, a chain conveyor charging control module, a stockpiling image recognition module and a chain conveyor control module; The electric furnace 1 includes an electric furnace body 101, an electrode 102, an oxygen supply and carbon injection lance 103 and a feeding device 104. The electrode 102 is connected to the electrode power supply control system 105, the oxygen supply and carbon injection lance 103 is connected to the oxygen supply and carbon injection control system 106, the feeding device 104 is connected to the feeding control system 107, and the electrode power supply control system 105, the oxygen supply and carbon injection control system 106 and the feeding control system 107 are connected to the electric furnace smelting control module through the electric furnace network system 108; The material tank 2 includes a connecting trolley 201, a preheating section 202 and a feeding section 203. The feeding section 203 is communicated with the connecting trolley 201 through the preheating section 202. The connecting trolley 201 realizes the final addition of scrap into the electric furnace body 101. The connecting trolley 201 is connected to the material tank control system 204, and the material tank control system 204 is connected to the material tank control module through the material tank network system 205; The apron conveyor 3 includes an apron conveyor body 301, an apron conveyor drive device 302, and an apron conveyor camera 308. The apron conveyor camera 308 is arranged above the feeding section 203. The apron conveyor body 301 is driven by the apron conveyor drive device 302, and the apron conveyor body 301 is connected to the feeding section 203; The apron conveyor loading control module is connected to the apron conveyor frequency converter 303 through the apron conveyor PLC control system 304. The apron conveyor frequency converter 303 controls the apron conveyor drive device 302. The stockpiling image recognition module is connected to the apron conveyor camera 308 through the apron conveyor SCADA data acquisition and monitoring control system operation station 306. The apron conveyor control module is connected to the apron conveyor database server 305. The apron conveyor SCADA data acquisition and monitoring control system operation station 306, the apron conveyor database server 305, and the apron conveyor PLC control system 304 are connected to the control system through the apron conveyor network system 307.

[0019] The electric furnace network system 108, the hopper network system 205, and the apron conveyor network system 307 form an overall network system through the Ethernet network system.

[0020] The control system further includes an apron conveyor alarm control module, an apron conveyor trend management module, an apron conveyor report management module, and an apron conveyor forced control module. The apron conveyor alarm control module, the apron conveyor trend management module, the apron conveyor report management module, and the apron conveyor forced control module are respectively connected to the apron conveyor 3.

[0021] The apron conveyor 3 has a structure with an automatic oil pump circulation and one driving motor with a standby.

[0022] A method for controlling scrap charging in electric furnace steelmaking includes the following steps: (1) Electric furnace smelting control: During the production of electric furnace smelting, the electric furnace adds scrap to the hopper through the apron conveyor. The charging and conveying system adds the scrap to the electric furnace furnace. The alloy and flux are added to the furnace through the charging control system. Strong power supply is carried out by the electrodes to melt the scrap, and oxygen lance blowing oxygen control and carbon lance spraying carbon control are carried out to complete the smelting of the scrap into qualified molten steel by the electric furnace; (2) Hopper feeding speed control: The electric furnace smelts in different stages. The hopper adjusts the feeding speed according to the rhythm of the electric furnace smelting. The apron conveyor scrap charging controls the apron conveyor speed in stages according to the scrap feeding speed of the hopper; (3) Apron conveyor loading control: Control the operation of the apron conveyor loading device through the apron conveyor frequency converter to achieve speed regulation control; (4) The apron conveyor control operates in three modes: manual control at the machine side, manual control by the upper computer, and full-automatic control. The maintenance mode adopts manual control at the machine side; (5) During normal production, full-automatic control is adopted, or manual control mode can be used for scrap feeding control; when in full-automatic control, it operates in a mode where the feeding speed of the chain conveyor matches the running speed of the hopper to achieve the optimal matching of the feeding speed of the chain conveyor and the feeding speed of the hopper.

[0023] In step (3) described above, the chain conveyor operates in a mode of automatic oil pump circulation and one drive motor with one standby to ensure the stability of scrap feeding of the chain conveyor.

[0024] In step (5) described above, a specific full-automatic control method is as follows: when the feeding speed of the hopper is at the lower limit of the feeding speed V1_L = 0% and the upper limit of the feeding speed V1_H = 30%, the speed of the chain conveyor F1 = 0, and the chain conveyor automatically stops feeding; when the feeding speed of the hopper is at the lower limit of the feeding speed V2_L = 0% and the upper limit of the feeding speed V2_H = 30%, the speed of the chain conveyor F2 = 10, and the chain conveyor feeds at a speed of 10 HZ; when the feeding speed of the hopper is at the lower limit of the feeding speed V3_L = 0% and the upper limit of the feeding speed V3_H = 30%, the speed of the chain conveyor F3 = 15, and the chain conveyor feeds at a speed of 15 HZ; when the feeding speed of the hopper is at the lower limit of the feeding speed V4_L = 0% and the upper limit of the feeding speed V4_H = 30%, the speed of the chain conveyor F4 = 20, and the chain conveyor feeds at a speed of 20 HZ; when the feeding speed of the hopper is at the lower limit of the feeding speed V5_L = 0% and the upper limit of the feeding speed V5_H = 30%, the speed of the chain conveyor F5 = 30, and the chain conveyor feeds scrap at a speed of 30 HZ.

[0025] In step (5) described above, according to the scrap stacking signal calculated by the stacking image recognition module using big data, the optimal control of the chain conveyor feeding is realized. While ensuring that the feeding speed of the hopper follows the smelting rhythm of the electric furnace and the feeding speed of the chain conveyor follows the feeding speed of the hopper, after the chain conveyor gets the stacking signal of the hopper, it controls the feeding of the chain conveyor according to the intensity of the stacking signal.

[0026] When the stacking signal is at the low level L, the chain conveyor speeds up the feeding speed; when the intensity of the stacking signal is medium and at the medium level M, the feeding speed of the chain conveyor is appropriately reduced; when the intensity of the stacking signal is high and at the high level H, the chain conveyor greatly reduces the feeding speed until it stops running.

[0027] In practical applications, the electric furnace 1 includes an electric furnace body 101, electrodes 102, an electrode power supply control system 105, an oxygen supply and carbon injection lance 103, an oxygen supply and carbon injection control system 106, a feeding device 104, a feeding control system 107, an electric furnace network system 108, etc. Among them, the electrode power supply control system 105 conducts electric furnace smelting by controlling the power supply of the electrodes 102; the oxygen supply and carbon injection control system 106 conducts carbon injection and oxygen blowing operations by controlling the opening and closing of the oxygen supply and carbon injection lance 103; the feeding control system 107 realizes the feeding operation by controlling the action of the feeding device 104; the above control systems realize network communication between the control systems through the electric furnace network system 108.

[0028] The charging chute 2 consists of a connecting trolley 201, a preheating section 202, a feeding section 203, a charging chute control system 204, and a charging chute network system 205, and uses a frequency converter for speed control to feed scrap steel into the electric furnace. Among them, the connecting trolley 201 of the charging chute 2 realizes the final addition of scrap steel into the electric furnace body 101, the preheating section 202 preheats the scrap steel using the flue gas from the electric furnace smelting, and the overhead crane electromagnetic crane and the chain conveyor realize the feeding of the scrap steel from the scrap steel pool into the feeding section 203 of the charging chute. The charging chute control system 204 realizes network communication between the control systems through the charging chute network system 205. The chain conveyor 3 consists of a chain conveyor body 301, a chain conveyor drive device 302, a chain conveyor frequency converter 303, a chain conveyor PLC control system 304, a chain conveyor database server 305, a chain conveyor SCADA data acquisition and monitoring control system operation station 306, a chain conveyor network system 307, a chain conveyor camera 308, etc.

[0029] The chain conveyor 3 uses the chain conveyor SCADA data acquisition and monitoring control system operation station 306 to execute corresponding control instructions by using the chain conveyor frequency converter 303 and the chain conveyor PLC control system 304, and drives the chain conveyor drive device 302 to drag the chain conveyor body 301 to operate, feeding the scrap steel into the charging chute 2. Among them, the chain conveyor camera 308 accesses the chain conveyor database server 305 through the chain conveyor network system 307 for video recognition processing to obtain the scrap steel stacking signal.

[0030] The electric furnace network system 108, the charging chute network system 205, and the chain conveyor network system 307 are configured into an overall system network system through the Ethernet system to realize data acquisition and communication transmission between the systems.

[0031] The control system consists of an electric furnace smelting control module, a charging chute control module, a chain conveyor feeding control module, a stacking image recognition module, a chain conveyor control module, a chain conveyor alarm control module, a chain conveyor trend management module, a chain conveyor report management module, a chain conveyor forced control module, etc.

[0032] The electric furnace smelting control module mainly completes the control of electrode power supply, oxygen lance oxygen blowing, carbon lance carbon injection, etc. during the electric furnace smelting process.

[0033] The bunker control module mainly combines the situation of the electric furnace smelting process and automatically controls the feeding speed of the bunker to meet the feeding requirements of scrap steel for the electric furnace.

[0034] The apron feeder feeding control module mainly controls the operation of the apron feeder through a frequency converter to achieve speed control. The apron feeder is a key equipment for feeding scrap steel into the electric furnace. It operates in a mode of automatic oil pump circulation and one drive motor with one standby to ensure the stability of scrap steel feeding by the apron feeder. The apron feeder control is divided into three operation modes: manual control beside the machine, manual control by the upper computer, and full-automatic control. The maintenance mode adopts manual operation beside the machine. During normal production, full-automatic control is generally adopted, and manual control can also be used for scrap steel feeding control. During full-automatic control, it operates in a mode where the feeding speed of the apron feeder matches the running speed of the bunker to achieve the optimal matching of the feeding speed of the apron feeder and the feeding speed of the Consteel. The control mode of the electric furnace apron feeder is shown in Table 1.

[0035] Table 1 - Control Mode Table of Electric Furnace Apron Feeder

[0036] The stockpiling image recognition module, through the on-site layout of the video monitoring system, real-time collects the addition situation of scrap steel in the bunker, conducts big data analysis of the video monitoring system to intercept relevant pictures of the scrap steel bunker, classifies, sorts, and identifies through the picture system, stores the image information in the database, conducts big data analysis, and applies the model algorithm of image recognition to give the scrap steel stockpiling signal.

[0037] The apron feeder control module mainly realizes the intelligent control of apron feeder feeding. On the one hand, during the electric furnace smelting process, according to different stages of production smelting, the bunker adopts different feeding speed controls, and through the PROFINET network communication method, the apron feeder control system and the bunker system are communicated. Through the corresponding control module, it is ensured that the apron feeder feeding follows the rhythm of bunker feeding and electric furnace smelting to achieve the optimal matching of the bunker feeding speed and the apron feeder feeding speed. On the other hand, according to the scrap steel stockpiling signal calculated by the stockpiling image recognition module using big data, the optimal control of apron feeder feeding is realized. While ensuring that the bunker feeding speed follows the rhythm of electric furnace smelting and the apron feeder feeding speed follows the bunker feeding speed, the problem of bunker stockpiling is solved. After the apron feeder receives the bunker stockpiling signal, it controls the apron feeder feeding according to the intensity of the stockpiling signal. When the stockpiling signal is at a low level, the apron feeder speeds up the feeding speed; when the intensity of the stockpiling signal is medium and at the middle level, the apron feeder feeding speed is appropriately reduced; when the intensity of the stockpiling signal is high, the apron feeder greatly reduces the feeding speed until it stops.

[0038] The chain plate machine alarm control module realizes the alarm management of abnormal conditions at the key control points of the control system, and can output visual alarms such as pop-up windows or sound alarms.

[0039] The chain plate machine trend management module realizes the recording, management, and query of the historical trends of the key control points of the control system, and assists in abnormal traceability.

[0040] The chain plate machine report management module realizes the statistical and analytical management of the key execution processes and operation conditions of the control system.

[0041] The chain plate machine forced control module realizes the forced management and control of some points after confirming the on-site situation in case of emergency failures during the electric furnace smelting process.

[0042] The working process of the present invention is as follows. 1. Electric furnace smelting control: During the production of electric furnace smelting, the electric furnace adds scrap steel to the charging hopper through the chain plate machine. The Consteel charging and conveying system adds scrap steel into the electric furnace, and alloys and fluxes are added into the furnace through the feeding control system. The electrodes are used for strong power supply to melt the scrap steel, and oxygen lance blowing oxygen control and carbon lance carbon spraying control are carried out to complete the smelting of scrap steel into qualified molten steel in the electric furnace.

[0043] 2. Charging hopper feeding speed control: The electric furnace smelts in different stages. The charging hopper adjusts the feeding speed according to the rhythm of the electric furnace smelting. The chain plate machine scrap steel feeding controls the speed of the chain plate machine in stages according to the scrap steel feeding speed of the charging hopper. If the feeding speed of the charging hopper is too fast, it will cause material stacking, jamming, and even waste; if the feeding speed is too slow, it will affect the production rhythm.

[0044] 3. Chain plate machine feeding control: Mainly controls the operation of the chain plate machine through the frequency converter to achieve speed regulation control. The chain plate machine is a key equipment for scrap steel feeding in the electric furnace, and it operates in the mode of automatic oil pump circulation and one driving motor with one standby to ensure the stability of scrap steel feeding by the chain plate machine.

[0045] 4. The chain plate machine control runs in three modes: manual control beside the machine, manual control by the upper computer, and full-automatic control. The maintenance mode adopts manual operation beside the machine. 5. During normal production, generally full-automatic control is adopted, and manual control mode can also be used for scrap steel feeding control. During full-automatic control, it runs in the mode of matching the chain plate machine feeding control with the running speed of the charging hopper to achieve the optimal matching of the feeding speed of the chain plate machine and the feeding speed of the charging hopper.

[0046] 6. A specific model automatic control method is as follows: when the feeding speed of the feed hopper is at the lower limit of the feeding speed V1_L = 0% and the upper limit of the feeding speed V1_H = 30%, the speed of the chain conveyor F1 = 0, and the chain conveyor automatically stops feeding; when the feeding speed of the feed hopper is at the lower limit of the feeding speed V2_L = 0% and the upper limit of the feeding speed V2_H = 30%, the speed of the chain conveyor F2 = 10, and the chain conveyor automatically feeds at a speed of 10 Hz; when the feeding speed of the feed hopper is at the lower limit of the feeding speed V3_L = 0% and the upper limit of the feeding speed V3_H = 30%, the speed of the chain conveyor F3 = 15, and the chain conveyor feeds at a speed of 15 Hz; when the feeding speed of the feed hopper is at the lower limit of the feeding speed V4_L = 0% and the upper limit of the feeding speed V4_H = 30%, the speed of the chain conveyor F4 = 20, and the chain conveyor feeds at a speed of 20 Hz; when the feeding speed of the feed hopper is at the lower limit of the feeding speed V5_L = 0% and the upper limit of the feeding speed V5_H = 30%, the speed of the chain conveyor F5 = 30, and the chain conveyor feeds scrap steel at a speed of 30 Hz.

[0047] 7. The manual control method controls the scrap steel on the chain conveyor according to the instructions of the on-site operators.

[0048] 8. For the recognition of the stockpiling video image, by arranging a video monitoring system on-site, the addition of scrap steel in the feed hopper is collected in real time, and relevant pictures of the scrap steel feed hopper are intercepted through big data analysis of the video monitoring system. After classification, sorting and recognition by the picture system, the image information is stored in the database for big data analysis. The model algorithm of image recognition is applied to give the scrap steel stockpiling intensity signal. The chain conveyor intelligently feeds materials on the chain conveyor according to the strength of the stockpiling intensity signal until the feeding stops.

Claims

1. An electric furnace steelmaking scrap feeding control system, characterized in that: It includes an electric furnace (1), a charging hopper (2), a chain conveyor (3) and a control system. The control system includes an electric furnace smelting control module, a charging hopper control module, a chain conveyor feeding control module, a stockpile image recognition module and a chain conveyor control module; The electric furnace (1) includes an electric furnace body (101), electrodes (102), an oxygen supply and carbon injection lance (103) and a feeding device (104). The electrodes (102) are connected to an electrode power supply control system (105), the oxygen supply and carbon injection lance (103) is connected to an oxygen supply and carbon injection control system (106), and the feeding device (104) is connected to a feeding control system (107). The electrode power supply control system (105), the oxygen supply and carbon injection control system (106) and the feeding control system (107) are connected to the electric furnace smelting control module through an electric furnace network system (108); The charging hopper (2) includes a connecting trolley (201), a preheating section (202) and a feeding section (203). The feeding section (203) is communicated with the connecting trolley (201) through the preheating section (202). The connecting trolley (201) realizes the final addition of scrap steel into the electric furnace body (101). The connecting trolley (201) is connected to a charging hopper control system (204), and the charging hopper control system (204) is connected to the charging hopper control module through a charging hopper network system (205); The chain conveyor (3) includes a chain conveyor body (301), a chain conveyor driving device (302) and a chain conveyor camera (308). The chain conveyor camera (308) is arranged above the feeding section (203). The chain conveyor body (301) is driven by the chain conveyor driving device (302), and the chain conveyor body (301) is connected to the feeding section (203); The chain conveyor feeding control module is connected to a chain conveyor frequency converter (303) through a chain conveyor PLC control system (304). The chain conveyor frequency converter (303) controls the chain conveyor driving device (302). The stockpile image recognition module is connected to the chain conveyor camera (308) through a chain conveyor SCADA data acquisition and monitoring control system operation station (306). The chain conveyor control module is connected to a chain conveyor database server (305). The chain conveyor SCADA data acquisition and monitoring control system operation station (306), the chain conveyor database server (305) and the chain conveyor PLC control system (304) are connected to the control system through a chain conveyor network system (307).

2. The scrap charging control system for electric furnace steelmaking according to claim 1, wherein: The electric furnace network system (108), the charging hopper network system (205) and the chain conveyor network system (307) form an overall network system through an Ethernet system.

3. The scrap charging control system for electric furnace steelmaking according to claim 1, wherein: The control system further includes a chain conveyor alarm control module, a chain conveyor trend management module, a chain conveyor report management module and a chain conveyor forced control module. The chain conveyor alarm control module, the chain conveyor trend management module, the chain conveyor report management module and the chain conveyor forced control module are respectively connected to the chain conveyor (3).

4. The scrap charging control system for electric furnace steelmaking according to claim 1, characterized in that: The chain conveyor (3) has a structure of automatic oil pump circulation and one driving motor with a standby.

5. A control method for scrap charging in electric furnace steelmaking, characterized in that It includes the following steps: (1)Electric furnace smelting control. During the production of electric furnace smelting, the electric furnace adds scrap steel to the charging hopper through a chain conveyor. The charging and conveying system adds scrap steel into the electric furnace. Alloy and flux are added into the furnace through the charging control system. Electrodes are used for strong power supply to melt the scrap steel, and oxygen lance blowing oxygen control and carbon lance spraying carbon control are carried out to complete the smelting of scrap steel into qualified molten steel by the electric furnace. (2)Charging hopper feeding speed control. The electric furnace smelts in different stages. The charging hopper adjusts the feeding speed according to the rhythm of the electric furnace smelting. The chain conveyor scrap steel feeding controls the speed of the chain conveyor in stages according to the scrap steel feeding speed of the charging hopper. (3)Chain conveyor feeding control. The operation of the chain conveyor feeding device is controlled by the chain conveyor frequency converter to achieve speed regulation control. (4)The chain conveyor control operates in three modes: manual control beside the machine, manual control by the upper computer, and full-automatic control. The maintenance mode adopts manual control beside the machine. (5)During normal production, full-automatic control is adopted, and manual control mode can also be used for scrap steel feeding control. During full-automatic control, it operates in a mode where the feeding speed of the chain conveyor matches the running speed of the charging hopper to achieve the optimal matching of the feeding speed of the chain conveyor and the feeding speed of the charging hopper.

6. A method for controlling the charging of scrap steel in an electric furnace steelmaking according to claim 5, characterized in that: In step (3) above, the chain conveyor operates in a mode of automatic oil pump circulation and one driving motor with one standby to ensure the stability of scrap steel feeding of the chain conveyor.

7. A method for controlling the charging of scrap steel in an electric furnace steelmaking according to claim 5, characterized in that: In step (5) above, a specific full-automatic control method is as follows: when the feeding speed of the charging hopper is at the lower limit of the feeding speed V1_L = 0% and the upper limit of the feeding speed V1_H 30%, the speed of the chain conveyor F1 = 0, and the chain conveyor automatically stops feeding; when the feeding speed of the charging hopper is at the lower limit of the feeding speed V2_L = 0% and the upper limit of the feeding speed V2_H 30%, the speed of the chain conveyor F2 = 10, and the chain conveyor feeds at a speed of 10H; when the feeding speed of the charging hopper is at the lower limit of the feeding speed V3_L = 0% and the upper limit of the feeding speed V3_H 30%, the speed of the chain conveyor F3 = 15, and the chain conveyor feeds at a speed of 15HZ; when the feeding speed of the charging hopper is at the lower limit of the feeding speed V4_L = 0% and the upper limit of the feeding speed V4_H 30%, the speed of the chain conveyor F4 = 20, and the chain conveyor feeds at a speed of 20HZ; when the feeding speed of the charging hopper is at the lower limit of the feeding speed V5_L = 0% and the upper limit of the feeding speed V5_H 30%, the speed of the chain conveyor F5 = 30, and the chain conveyor feeds scrap steel at a speed of 30HZ.

8. A method for controlling the charging of scrap steel in an electric furnace steelmaking process according to claim 5, characterized in that: In step (5) above, according to the scrap steel stacking signal calculated by the stacking image recognition module using big data, the optimal control of the chain conveyor feeding is realized. While ensuring that the feeding speed of the charging hopper follows the rhythm of the electric furnace smelting and the feeding speed of the chain conveyor follows the feeding speed of the charging hopper, after the chain conveyor gets the stacking signal of the charging hopper, it controls the feeding of the chain conveyor according to the intensity of the stacking signal.

9. The method for controlling the charging of scrap steel in an electric furnace steelmaking according to claim 8, characterized in that: When the stacking signal is at the low level L, the chain conveyor speeds up the feeding speed; when the intensity of the stacking signal is medium and at the medium level M, the feeding speed of the chain conveyor is appropriately reduced; when the intensity of the stacking signal is high and at the high level H, the feeding speed of the chain conveyor is greatly reduced until it stops running.

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