A gunning machine for a steelmaking electric furnace

Abstract

The utility model discloses a kind of gunning machines for steelmaking electric furnace, including base;Vertical rotation is provided with rotating shaft on the base;Rotating shaft is hingedly connected with main body on it;The outer end of main body is hingedly connected with work head connecting seat;The lower part of work head connecting seat is provided with work head;Work head can rotate around its vertical center line;The lower part of work head is provided with spray head;Spray head can rotate up and down on horizontal plane, so that spray head can adjust the height of position aimed at;Rotating shaft and work head connecting seat are further provided with connecting rod between them;Hydraulic cylinder is further provided between main body and rotating shaft;When the piston rod of hydraulic cylinder extends, the main body rises, while work head connecting seat is pulled close to main body by connecting rod;When the piston rod of hydraulic cylinder retracts, the main body will drop, while work head connecting seat is supported away from main body by connecting rod;The utility model can carry out gunning refractory material operation at 200 DEG C for more than 30 minutes.

Description

Technical Field

[0001] This utility model belongs to the technical field of maintenance equipment for steelmaking electric furnaces, specifically relating to a spraying machine for steelmaking electric furnaces that can perform rapid and efficient refractory material spraying operations for more than 30 minutes at a high temperature of 200℃. Background Technology

[0002] The inner wall of an electric arc furnace (EAF) can suffer damage to refractory materials during the steelmaking process. The operating temperature inside an EAF is typically around 1600℃. If manual repairs are done after the furnace has completely cooled down, and the furnace needs to be reheated before steelmaking can continue, it wastes time and reduces the furnace's efficiency. In practice, to ensure continuous steelmaking operations, refractory material repair is performed during the intervals between charging and uncharging. The window for repairing damaged refractory materials is usually only 10-30 minutes! To address this, we have developed a steelmaking electric furnace spraying machine that can rapidly and efficiently perform refractory material spraying operations for more than 30 minutes at a high temperature of 200℃. Summary of the Invention

[0003] The purpose of this invention is to provide a steelmaking electric furnace spraying machine that can perform rapid and efficient refractory material spraying operations at a high temperature of 200℃ for more than 30 minutes.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a spraying machine for steelmaking electric furnaces, comprising a base; a rotating shaft rotatably mounted on the base; a main body hinged to the rotating shaft; a working head connecting seat hinged to the outer end of the main body; a working head provided at the lower part of the working head connecting seat; the working head rotatable about its vertical center line; a nozzle provided at the lower part of the working head; the nozzle rotatable about a horizontal plane, allowing adjustment of its aligned position height; a connecting rod is also provided between the rotating shaft and the working head connecting seat; a hydraulic cylinder is also provided between the main body and the rotating shaft; when the piston rod of the hydraulic cylinder extends, the main body rises, and the working head connecting seat is pulled closer to the main body by the connecting rod, at which point it is in a retracted state; when the piston rod of the hydraulic cylinder retracts, the main body descends, and the working head connecting seat is supported away from the main body by the connecting rod, at which point it is in a working state.

[0005] Preferably, one end of the main body is hinged on the rotating shaft, and the other end is hinged to the working head connecting seat.

[0006] Preferably, the height of the connection between the connecting rod and the rotating shaft is lower than the height of the connection between the main body and the rotating shaft; the height of the connection between the connecting rod and the working head connecting seat is lower than the height of the connection between the main body and the working head connecting seat; the connection between the hydraulic cylinder and the main body is located in the middle of the main body; and the height of the connection between the hydraulic cylinder and the rotating shaft is lower than the height of the connection between the connecting rod and the working head connecting seat.

[0007] Preferably, the rotating shaft is controlled to rotate by a rotating shaft control motor; the nozzle is controlled to rotate by a nozzle control motor; and the working head is controlled to rotate by a working head control motor.

[0008] Preferably, a camera is provided on the outer side of the lower part of the working head; the camera is used to take pictures of the position where the nozzle is aligned in order to check the spraying effect of the nozzle.

[0009] Preferably, the main body is internally equipped with a feeding pipe, a water pipe, and an air supply pipe; during feeding, the pressure inside the feeding pipe is 6 standard atmospheres, which can achieve a feeding speed of 200-300 kg / min.

[0010] Preferably, the spraying machine for the steelmaking electric furnace further includes a pressure stabilizer, which provides stable pressure to the feed pipe.

[0011] Preferably, a water-material mixer is provided inside the working head connecting seat; the water-material mixer is circular and hollow inside; the inlet end of the water-material mixer is connected to the main pipe; the main pipe is connected to the feed pipe; the water-material mixer is also provided with an air pipe connector; the air pipe connector is connected to the air supply pipe; atomizing pipes are evenly distributed on the circular sidewall of the water-material mixer 44; the angle between the atomizing pipe and the vertical direction is between 20-30°, the outlet of the atomizing pipe is located below it and is set close to the center line of the water-material mixer; the inlet of the atomizing pipe is connected to the air pipe connector respectively; each atomizing pipe... Each pipe is connected to a water flow pipe; at least a portion of the water flow from the water flow pipe is aligned with the airflow direction within the atomizing pipe; the water flow pipe is connected to a water pipe for transporting water; the water entering the atomizing pipe is atomized by high-pressure airflow, and the atomized water is transported to the main pipe to mix with the refractory material transported by the feeding pipe to improve its adhesion by 70-85%; the outlet end of the water-material mixer is connected to the nozzle via a main pipe, and the refractory material mixed in the water-material mixer is transported to the nozzle via the main pipe, and the nozzle can spray refractory material to repair damaged areas of the refractory material in the steelmaking electric furnace.

[0012] Preferably, the main body, the working head connecting seat, and the working head are internally connected. During operation, high-pressure cooling air is circulated inside the main body, the working head connecting seat, and the working head for cooling. The main body, the working head connecting seat, the working head, and the connecting rod are all surrounded by heat insulation material. The camera and the nozzle are also wrapped with heat insulation material. When the working head is in operation, the working head connecting seat can work continuously at a high temperature of 200°C for more than 30 minutes.

[0013] Preferably, during operation, the water pressure in the water flow pipe is greater than the air pressure in the atomizing pipe.

[0014] Compared with the prior art, this utility model provides a spraying machine for steelmaking electric furnaces, which has the following beneficial effects: The refractory spraying machine for electric furnaces described in this invention can perform rapid and efficient refractory material spraying operations for more than 30 minutes at a high temperature of 200℃, and can be operated in a semi-automatic, automatic, or manual manner. This invention can also quickly target the damaged areas of refractory materials inside the electric furnace, and is easy and quick to store. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the storage state of a steelmaking electric furnace spraying machine proposed in this utility model. Figure 2 This is an enlarged schematic diagram of the storage and working state transition of a spraying machine for steelmaking electric furnace proposed in this utility model. Figure 3 This is an enlarged schematic diagram of the working state of a steelmaking electric furnace spraying machine proposed in this utility model. Figure 4 for Figure 3 Enlarged cross-sectional view of HH in the image; Figure 5 This is an enlarged schematic diagram of the working head of a spraying machine for a steelmaking electric furnace proposed in this utility model; Figure 6 for Figure 5 Enlarged cross-sectional view of JJ in the image; Figure 7 This is an enlarged view of part A in the diagram; In the diagram: 1. Base; 2. Rotating shaft; 3. Main body; 4. Working head connecting seat; 5. Nozzle; 6. Camera; 7. Connecting rod; 8. Hydraulic cylinder; 9. Feed pipe; 10. Water pipe; 11. Working head; 12. Steelmaking electric furnace; 41. Outer shell; 42. Refractory material layer; 43. Main pipe; 44. Water-material mixer; 45. Air pipe connector; 46. Atomizing pipe; 47. Water flow pipe. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0017] Please see Figure 1-7 This utility model provides a technical solution: a spraying machine for steelmaking electric furnaces, including a base 1; a rotating shaft 2 is vertically rotatable on the base 1; a main body 3 is hinged to the rotating shaft 2; in this embodiment, one end of the main body 3 is hinged to the rotating shaft 2, and the other end is hinged to a working head connecting seat 4; a working head 11 is provided at the lower part of the working head connecting seat 4; the working head 11 can rotate around its vertical center line; a nozzle 5 is provided at the lower part of the working head 11; the nozzle 5 can rotate up and down around a horizontal plane so that the height of its aligned position can be adjusted; in this embodiment, the nozzle 5 can rotate upwards by a maximum of 15° and downwards by a maximum of 45°; A connecting rod 7 is also provided between the rotating shaft 2 and the working head connecting seat 4; the height of the connection between the connecting rod 7 and the rotating shaft 2 is lower than the height of the connection between the main body 3 and the rotating shaft 2; the height of the connection between the connecting rod 7 and the working head connecting seat 4 is lower than the height of the connection between the main body 3 and the working head connecting seat 4; a hydraulic cylinder 8 is also provided between the main body 3 and the rotating shaft 2; the connection between the hydraulic cylinder 8 and the main body 3 is located in the middle of the main body 3; the height of the connection between the hydraulic cylinder 8 and the rotating shaft 2 is lower than the height of the connection between the connecting rod 7 and the working head connecting seat 4; when the piston rod of the hydraulic cylinder 8 extends, the main body 3 rises, and at the same time, the working head connecting seat 4 is pulled closer to the main body 3 by the connecting rod 7, as shown in the attached figure. Figure 2 , 3 As shown, it is currently in the retracted state; when the piston rod of the hydraulic cylinder 8 retracts, the main body 3 will descend, and at the same time, the working head connecting seat 4 will be supported away from the main body 3 by the connecting rod 7, as shown in the attached figure. Figure 1 As shown, it is currently in working condition.

[0018] In this embodiment, the rotating shaft 2 is controlled to rotate by a rotating shaft control motor (not shown); the nozzle 5 is controlled to rotate by a nozzle control motor (not shown); and the working head 11 is controlled to rotate by a working head control motor (not shown).

[0019] A camera 6 is provided on the outer side of the lower part of the working head connecting seat 4; the camera 6 is used to take pictures of the position where the nozzle 5 is aligned, so as to check the spraying effect of the nozzle 5.

[0020] The main body 3 is internally equipped with a feed pipe 9, a water pipe 10, and an air supply pipe (not shown). To improve feeding efficiency, the pressure inside the feed pipe 9 is 6 standard atmospheres during feeding, which can achieve a feeding speed of 200-300 kg / min; a pressure stabilizer is specially installed to ensure the stability of the pressure inside the feed pipe 9.

[0021] A water-material mixer 44 is provided inside the working head connecting seat 4; the water-material mixer 44 is circular and hollow inside; the inlet end of the water-material mixer 44 is connected to the main pipe 43; the main pipe 43 is connected to the feed pipe 9; an air pipe connector 45 is also provided on the water-material mixer 44; the air pipe connector 45 is connected to the air supply pipe; atomizing pipes 46 are evenly distributed on the circular side wall of the water-material mixer 44; the angle between the atomizing pipe 46 and the vertical direction is between 20-30°, and the outlet of the atomizing pipe 46 is located below it and close to the center line of the water-material mixer 44; the inlets of the atomizing pipes 46 are respectively connected to the air pipe connector 45; each of the atomizing pipes... Each of the 46 is connected to a water flow pipe 47; at least a portion of the water flow from the water flow pipe 47 is in the same direction as the airflow in the atomizing pipe 46; the water flow pipe 47 is connected to the water pipe 10 for conveying water flow. The water entering the atomizing pipe 46 is atomized by the high-pressure airflow. The atomized water is then conveyed to the main pipe 43 and mixed with the refractory material conveyed by the feeding pipe 9 to improve its adhesion by 70-85%; the outlet end of the water-material mixer 44 is connected to the nozzle 5 through the main pipe 43. The refractory material mixed in the water-material mixer 44 is conveyed to the nozzle 5 through the main pipe 43. The nozzle 5 can spray refractory material to repair the damaged areas of the refractory material in the steelmaking electric furnace 12.

[0022] The working head connecting seat 4 includes a shell 41; the inner wall of the shell 41 is provided with a refractory material layer 42; the main body 3, the working head connecting seat 4, and the working head 11 are internally connected, and high-pressure cooling air is circulated inside the main body 3, the working head connecting seat 4, and the working head 11 during operation for cooling; the main body 3, the working head connecting seat 4, the working head 11, and the connecting rod 7 are all provided with heat insulation material; the camera 6 and the nozzle 5 are also respectively wrapped with heat insulation material; since the working head 11 will penetrate into the steelmaking electric furnace 12 during operation, and the temperature inside the steelmaking electric furnace 12 is high, in this embodiment, the temperature inside the steelmaking electric furnace 12 is generally around 200°C when the working head 11 is operating, and the working head 11 can work continuously for more than 30 minutes.

[0023] During refractory spraying operations, first retract the piston rod of the hydraulic cylinder 8, causing the main body 3 to descend. Simultaneously, the working head 11 is supported by the connecting rod 7, moving it away from the main body 3, as shown in the attached diagram. Figure 1 As shown, the furnace is in operation; at this time, the working head 11 is located at the center of the steelmaking electric furnace 12; the height of the nozzle 5 is then adjusted so that it is aimed at the damaged area of ​​the refractory material inside the steelmaking electric furnace 12; then the supply of refractory material, water, and high-pressure gas is started to spray refractory material to repair the damaged area inside the steelmaking electric furnace 12; the diameter of the refractory material spraying operation is between 5 and 7 meters; the camera 6 is used to check the spraying effect of the nozzle 5; when the damaged area of ​​the refractory material inside the steelmaking electric furnace 12 is continuous and relatively long, the working head can also be activated to control the spraying. The motor controls the rotation of the working head 11; the nozzle 5 continuously sprays refractory material onto the damaged areas of the refractory material inside the steelmaking electric furnace 12; if the height of the nozzle 5 needs to be adjusted, it can be coarsely adjusted using the hydraulic cylinder 8, and then finely adjusted using the nozzle control motor (not shown); in this way, the damaged areas of the refractory material inside the steelmaking electric furnace 12 can be quickly sprayed with refractory material; during operation, the water pressure in the water pipe 47 is greater than the air pressure in the atomizing pipe 46, which can prevent the main pipe 43 from being blocked, and at the same time reduce the air pressure requirements and reduce costs.

[0024] Compared with the prior art, the present invention has the following beneficial effects: The refractory spraying machine for steelmaking electric furnaces described in this utility model can perform rapid and efficient refractory material spraying operations for more than 30 minutes at a high temperature of 200℃. It can be operated in a semi-automatic, automatic, or manual manner. This utility model can also quickly target the damaged refractory material inside the steelmaking electric furnace 12, and it is also convenient and quick to store.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A spraying machine for steelmaking electric furnaces, characterized in that: The device includes a base; a rotating shaft is vertically rotatable on the base; a main body is hinged to the rotating shaft; a working head connector is hinged to the outer end of the main body; a working head is located at the lower part of the working head connector; the working head can rotate around its vertical center line; a nozzle is located at the lower part of the working head; the nozzle can rotate up and down around a horizontal plane so that the height of the nozzle can be adjusted for alignment; a connecting rod is also provided between the rotating shaft and the working head connector; a hydraulic cylinder is also provided between the main body and the rotating shaft; when the piston rod of the hydraulic cylinder extends, the main body rises, and the working head connector is pulled closer to the main body by the connecting rod, at which point it is in a retracted state; when the piston rod of the hydraulic cylinder retracts, the main body descends, and the working head connector is supported away from the main body by the connecting rod, at which point it is in a working state.

2. The spraying machine for steelmaking electric furnaces according to claim 1, characterized in that: One end of the main body is hinged to the rotating shaft, and the other end is hinged to the working head connecting seat.

3. The spraying machine for steelmaking electric furnaces according to claim 1, characterized in that: The height of the connection between the connecting rod and the rotating shaft is lower than the height of the connection between the main body and the rotating shaft; the height of the connection between the connecting rod and the working head connecting seat is lower than the height of the connection between the main body and the working head connecting seat; the connection between the hydraulic cylinder and the main body is located in the middle of the main body; the height of the connection between the hydraulic cylinder and the rotating shaft is lower than the height of the connection between the connecting rod and the working head connecting seat.

4. The spraying machine for steelmaking electric furnaces according to claim 1, characterized in that: The rotating shaft is controlled to rotate by a rotating shaft control motor; the nozzle is controlled to rotate by a nozzle control motor; and the working head is controlled to rotate by a working head control motor.

5. The spraying machine for steelmaking electric furnaces according to claim 1, characterized in that: A camera is installed on the lower outer side of the working head; the camera is used to take pictures of the position where the nozzle is aligned in order to check the spraying effect of the nozzle.

6. The spraying machine for steelmaking electric furnaces according to claim 1, characterized in that: The main body is equipped with a feeding pipe, a water pipe and an air supply pipe; during feeding, the pressure inside the feeding pipe is 6 standard atmospheres, which can achieve a feeding speed of 200-300 kg / min.

7. A spraying machine for steelmaking electric furnaces according to claim 6, characterized in that: It also includes a pressure regulator that provides stable pressure to the feed tube.

8. A spraying machine for steelmaking electric furnaces according to claim 1, characterized in that: A water-material mixer is installed inside the working head connector; the water-material mixer is circular and hollow inside; the inlet end of the water-material mixer is connected to the main pipe; the main pipe is connected to the feed pipe; the water-material mixer is also equipped with an air pipe connector; the air pipe connector is connected to the air supply pipe; atomizing pipes are evenly distributed on the circular sidewall of the water-material mixer; the angle between the atomizing pipe and the vertical direction is between 20-30°, and the outlet of the atomizing pipe is located below it and close to the center line of the water-material mixer; the inlets of the atomizing pipes are respectively connected to the air pipe connectors; each atomizing pipe is divided into... The water flow is not connected to a water pipe; at least part of the water flow from the water pipe is aligned with the airflow direction in the atomizing pipe; the water pipe is connected to a water pipe for transporting water; the water entering the atomizing pipe is atomized by high-pressure airflow; the atomized water is transported to the main pipe and mixed with the refractory material transported by the feeding pipe to improve its adhesion by 70-85%; the outlet end of the water-material mixer is connected to the nozzle through the main pipe; the refractory material mixed in the water-material mixer is transported to the nozzle through the main pipe; the nozzle can spray refractory material to repair damaged areas of the refractory material in the steelmaking electric furnace.

9. A spraying machine for steelmaking electric furnaces according to claim 5, characterized in that: The main body, the working head connecting seat, and the working head are internally connected. During operation, high-pressure cooling air is circulated inside the main body, the working head connecting seat, and the working head for cooling. The main body, the working head connecting seat, the working head, and the connecting rod are all surrounded by heat insulation material. The camera and the nozzle are also wrapped with heat insulation material. When the working head is in operation, the working head connecting seat can work continuously at a high temperature of 200°C for more than 30 minutes.

10. A spraying machine for steelmaking electric furnaces according to claim 1, characterized in that: During operation, the water pressure in the water flow pipe is greater than the air pressure in the atomizing pipe.

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