Converter opening adhering slag cleaning device and cleaning method thereof

Abstract

The invention provides a converter opening adhering slag cleaning device and a cleaning method thereof, and belongs to the technical field of steelmaking production technology.The converter opening adhering slag cleaning device comprises a trolley, a spray gun, an oxygen supply pipe and a powder spraying mechanism, moving wheels are arranged at the bottom of the trolley, and a slag stopping mark used for being put into a converter is detachably installed on the trolley; the powder spraying mechanism comprises a material spraying bin, a discharging valve and a powder supply part, the spraying gun comprises a gun body, the gun body is rotationally sleeved with a mixing part, a spraying head is arranged at the front end of the gun body, and the spraying head sprays a mixture of oxygen and metal powder to the slag adhering position of a converter opening. By adopting the method, additional blowing-out operation time is not required to be arranged, and normal converter operation is not occupied; and the movable trolley enables the spray head to go deep into the converter, and the cleaning efficiency is effectively improved by means of violent heat release through injection metal powder oxidation.

Description

Technical Field

[0001] The invention relates to the technical field of steelmaking production process, and in particular to a converter port slag cleaning device and a cleaning method thereof. Background Art

[0002] During the blowing process of converter steelmaking, foamy slag and splashing of molten steel are generated, and a steel-slag mixture is accumulated at the converter mouth, commonly known as slag or nodules. This irregular slag extends downward from the furnace mouth or accumulates on the furnace mouth, affecting the subsequent charging and slag making process. The slag has a certain strength and toughness. Whether it is mechanical knocking or manual blowing, it is time-consuming and labor-intensive, which seriously restricts the production rhythm of the converter.

[0003] The existing method for cleaning slag hanging at the converter mouth has low cleaning efficiency and requires stopping the furnace to arrange additional cleaning time, which is difficult to meet the production rhythm; the cleaning efficiency is poor and it is impossible to solve the slag hanging deep in the furnace cap of the furnace mouth. Summary of the invention

[0004] The present application provides a converter mouth slag cleaning device and a converter mouth cleaning method, which can achieve the purpose of cleaning the converter mouth quickly and efficiently.

[0005] To achieve the purpose of the present invention, the present invention is implemented by the following technical scheme: a converter port slag cleaning device, comprising: a trolley, a spray gun, an oxygen supply pipe and a powder spraying mechanism;

[0006] The bottom of the trolley is provided with moving wheels, and a slag stopper for being put into the converter can be detachably mounted on the trolley;

[0007] The powder spraying mechanism comprises a spraying bin, a discharge valve and a powder supply part, wherein the spraying bin has a conveying cavity for conveying metal powder, the discharge valve is fixedly connected to the bottom end of the spraying bin, the powder supply part is fixedly connected to the bottom end of the discharge valve, and the powder supply part has a powder channel for conveying metal powder, and the conveying cavity is connected or closed with the powder channel by adjusting the discharge valve;

[0008] The spray gun comprises a gun body, the gun body is arranged inside the trolley, the gun body is rotatably connected to the trolley, the front end of the oxygen supply pipe is connected to the rear end of the gun body, the gun body has an oxygen channel for conveying oxygen, a mixing part is rotatably sleeved on the gun body, the mixing part is located in the trolley, the mixing part is fixedly connected to the bottom end of the powder supply part, the gun body also has a mixing channel for conveying a mixture of oxygen and metal powder, the mixing part connects the powder channel, the oxygen channel and the mixing channel;

[0009] A nozzle is provided at the front end of the gun body, and the nozzle is located outside the trolley. The nozzle sprays a mixture of oxygen and metal powder to the slag hanging position of the converter mouth.

[0010] Preferably, the powder supply part is arranged in the trolley, the powder supply part is fixedly connected to the trolley, the top end of the powder supply part is communicated with the upper end surface of the trolley, and the discharge valve is fixedly connected to the top end of the trolley.

[0011] Preferably, the converter port slag cleaning device further comprises a booster pipe, the booster pipe is fixedly connected to the outer periphery of the spray bin, the booster pipe has a gas channel for conveying gas, and the gas channel is connected to the conveying chamber.

[0012] Preferably, the powder spraying mechanism also includes a storage bin and a sealing valve, the storage bin has a storage chamber for storing metal powder, the sealing valve is fixedly connected to the bottom end of the storage bin, and the sealing valve is fixedly connected to the top end of the spraying bin, and the storage chamber is connected or closed to the conveying chamber by adjusting the sealing valve.

[0013] Preferably, the nozzle is arranged obliquely, and the nozzle gradually moves away from the central axis of the gun body from back to front.

[0014] Preferably, the spray gun further comprises a rotating mechanism and a rotating joint;

[0015] The rotating mechanism is arranged inside the trolley, the driving end of the rotating mechanism is rotatably connected to the gun body to drive the gun body to rotate axially, the rotating joint is fixedly connected to the rear end of the gun body, and the rotating joint is rotatably connected to the front end of the oxygen supply tube.

[0016] Preferably, the converter port slag cleaning device further comprises a delivery mechanism, and the delivery mechanism comprises a driving part and a delivery arm;

[0017] The driving part is arranged inside the trolley, the driving part is fixedly connected to the bottom of the rotating mechanism, the delivery arm is passed through the inside of the trolley and is arranged below the gun body at intervals, the delivery arm is rotatably connected to the trolley, and the slag blocking mark is provided at the front end of the delivery arm.

[0018] Preferably, it also includes a support assembly, which includes a support column and a support frame, the bottom of the support column is fixedly connected to the inside of the trolley, the support frame is rotatably connected to the top of the support column, the support frame is sleeved on the delivery arm and the gun body, the support frame is fixedly connected to the delivery arm, and the support frame is rotatably connected to the gun body.

[0019] Preferably, the converter port slag cleaning device further comprises a lifting mechanism;

[0020] The lifting mechanism is fixedly connected to the inside of the trolley, and the driving end of the lifting mechanism is fixedly connected to the bottom end of the driving part. The lifting mechanism drives the driving part and the rotating mechanism to move up and down, thereby driving the spray gun and the delivery mechanism to swing up and down with the top of the support column as the fulcrum.

[0021] The present application also provides a method for cleaning a converter port slag cleaning device, comprising:

[0022] S1, adding metal powder into the spraying bin;

[0023] S2, the trolley moves so that the nozzle extends to the slag hanging position of the converter port, and the oxygen supply pipe starts to supply oxygen;

[0024] S3, opening the discharge valve to allow oxygen to spray metal powder to the slag position of the converter port, while the rotating mechanism drives the gun body to rotate to spray the mixture of oxygen and metal powder to the slag position of the converter port, and spraying until the slag is cleaned under the set conditions;

[0025] S4, closing the feed valve and the oxygen supply pipe;

[0026] S5, the trolley puts the slag stopper into the converter outlet;

[0027] S6. The trolley moves back to the standby position.

[0028] Compared with the prior art, the converter port slag cleaning device and the cleaning method of the present invention have the following beneficial effects:

[0029] 1. The present invention utilizes the violent heat release caused by the oxidation of the sprayed metal powder to accelerate the melting of the slag at the converter mouth. Especially when the slag has a low content of metallic iron and the heat release is insufficient, the slag can still be quickly cleaned up by supplementing heat through external powder spraying. In addition, oxygen and metal powder can be sprayed to various positions in the converter by the movement of the trolley and the rotation of the gun body, effectively improving the cleaning effect.

[0030] 2. The present invention does not require additional shutdown time. When the converter starts to tap steel, the nozzle is extended into the converter to clean the slag. After 2-3 minutes of cleaning, the trolley puts the slag blocking mark into the converter, and then the converter can proceed to subsequent process steps without squeezing out normal converter operations, effectively improving the converter operation rate by 10%.

[0031] 3. Compared with the existing mechanical beating plus manual oxygen blowing method which takes an average of 10-20 minutes each time for cleaning, the average cleaning time of the present invention is within 3 minutes each time, greatly shortening the cleaning operation time. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is the working diagram of the converter mouth slag cleaning device for this application.

[0033] Figure 2 This is a schematic diagram of the structure of the converter mouth slag cleaning device for this application.

[0034] In the figure:

[0035] 1. Trolley; 11. Moving wheel; 12. Slag stopper; 2. Spray gun; 21. Gun body; 211. Oxygen channel; 212. Mixing channel; 22. Mixing section; 23. Spray head; 24. Rotating mechanism; 25. Rotating joint; 3. Oxygen supply pipe; 4. Powder spraying mechanism; 41. Spraying bin; 411. Conveying chamber; 42. Unloading valve; 43. Powder supply section; 431. Powder channel; 44. Storage bin; 441. Storage chamber; 45. Sealing valve; 5. Booster pipe; 51. Gas channel; 6. Delivery mechanism; 61. Driving section; 62. Delivery arm; 7. Support assembly; 71. Support column; 72. Support frame; 8. Lifting mechanism. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0037] In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0038] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a replaceable connection, or an integral connection, it can be a mechanical connection, it can be an electrical connection, it can be a direct connection, it can be indirectly connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0039] Combination Figure 1As shown, a slag cleaning device for a converter mouth comprises: a trolley 1, a spray gun 2, an oxygen supply pipe 3 and a powder spraying mechanism 4; a moving wheel 11 is provided at the bottom of the trolley 1, and a slag blocking mark 12 for being put into the converter can be detachably installed on the trolley 1; the powder spraying mechanism 4 comprises a spray bin 41, a discharge valve 42 and a powder supply part 43, the spray bin 41 has a conveying chamber 411 for conveying metal powder, the discharge valve 42 is fixedly connected to the bottom end of the spray bin 41, the powder supply part 43 is fixedly connected to the bottom end of the discharge valve 42, the powder supply part 43 has a powder channel 431 for conveying metal powder, and the conveying chamber 411 is connected to or closed by adjusting the discharge valve 42; the spray gun 2 comprises a gun body 21, and the gun body 21 is provided with a Inside the trolley 1, the gun body 21 is rotatably connected to the trolley 1, the front end of the oxygen supply pipe 3 is connected to the rear end of the gun body 21, the gun body 21 has an oxygen channel 211 for conveying oxygen, the gun body 21 has a mixing portion 22 rotatably sleeved, the mixing portion 22 is located in the trolley 1, the mixing portion 22 is fixedly connected to the bottom end of the powder supply portion 43, the gun body 21 also has a mixing channel 212 for conveying a mixture of oxygen and metal powder, the mixing portion 22 connects the powder channel 431, the oxygen channel 211, and the mixing channel 212; a nozzle 23 is provided at the front end of the gun body 21, the nozzle 23 is located outside the trolley 1, and the nozzle 23 sprays the mixture of oxygen and metal powder to the slag hanging position of the converter mouth.

[0040] Exemplarily, the metal powder can be iron powder, ferrosilicon powder, ferromanganese powder, ferrosilicon manganese powder, aluminum powder, magnesium powder, etc., with a particle size equivalent diameter of less than 0.5 mm. When tapping steel, the converter is tilted to 90-110°, the trolley 1 moves forward to align the nozzle 23 with the slag position that needs to be cleaned, and the oxygen supply pipe 3 delivers high-pressure oxygen to the gun body 21, the oxygen pressure of which is greater than 1.5Mpa, and the flow rate is greater than 1000Nm3 / h, and the discharge valve 42 is adjusted so that the metal powder supply is 2-5kg / min, the metal powder enters the gun body 21 under the action of gravity, and the metal powder is sprayed to the slag at the converter mouth by oxygen, where the temperature is above 1200°C, the metal powder and the metal iron in the slag and oxygen burn violently and release heat to melt and drip the slag, and the discharge valve 42 and the oxygen supply pipe 3 are closed after cleaning for 2-3 minutes, and the trolley 1 drops the slag stopper 12 and withdraws to the standby position, at which time the slag cleaning is completed, and the converter can continue the subsequent process flow. The present application does not require additional furnace downtime for cleaning slag, and does not occupy normal converter operations; the converter operation rate is effectively improved, and the mobile trolley 1 moves the nozzle 23 deep into the converter, and the sprayed metal powder is oxidized to release heat violently, which effectively improves the cleaning efficiency.

[0041] In some embodiments, the slag stopper 12 is first installed at one end of the delivery mechanism 6 of the trolley 1, and the delivery mechanism 6 is connected to the bottom of the spray gun 2 through a connecting frame, and the slag stopper 12 is located behind the nozzle 23. After the nozzle 23 completes the spraying of the mixture of oxygen and metal powder in the front, the discharge valve 42 and the oxygen supply pipe 3 are closed, and the trolley 1 continues to move forward so that the slag stopper 12 is directly above the converter outlet, and the delivery mechanism 6 is started to deliver the slag stopper 12, and the slag stopper 12 freely falls into the steel slag, and the trolley 1 moves back to the standby position. The converter outlet slag cleaning device of the present application can complete the slag cleaning task by using the steel tapping time.

[0042] In some embodiments, the powder supply part 43 is disposed in the trolley 1, the powder supply part 43 is fixedly connected to the trolley 1, the top of the powder supply part 43 is communicated with the upper end surface of the trolley 1, and the discharge valve 42 is fixedly connected to the top of the trolley 1. This facilitates the metal powder to enter the mixing part 22 from the powder supply part 43 under the action of gravity, and then be smoothly sprayed to the mixing channel 212 through oxygen.

[0043] In some embodiments, the converter port slag cleaning device further includes a booster pipe 5, the booster pipe 5 is fixedly connected to the outer periphery of the spray bin 41, the booster pipe 5 has a gas channel 51 for conveying gas, and the gas channel 51 is connected to the conveying chamber 411. The booster pipe 5 is used to pressurize the spray bin 41 until the pressure is the same as that in the oxygen supply pipe 3, and then the discharge valve 42 is opened to ensure that the metal powder is sprayed out from the nozzle 23 by the high-pressure oxygen.

[0044] In some embodiments, the powder spraying mechanism 4 also includes a storage bin 44 and a sealing valve 45. The storage bin 44 has a storage chamber 441 for storing metal powder. The sealing valve 45 is fixedly connected to the bottom end of the storage bin 44. The sealing valve 45 is fixedly connected to the top end of the spraying bin 41. The storage chamber 441 is connected to or closed with the conveying chamber 411 by adjusting the sealing valve 45.

[0045] Before pressurizing the spraying bin 41 , the sealing valve 45 is opened first to allow a certain amount of metal powder in the storage bin 44 to enter the spraying bin 41 . After closing the sealing valve 45 , the spraying bin 41 is pressurized to control the flow and pressure of the metal powder entering the mixing section.

[0046] In some embodiments, the nozzle 23 is arranged at an angle, and the nozzle 23 gradually moves away from the central axis of the gun body 21 from the back to the front. By moving the trolley 1 and rotating the nozzle 23, the oxygen and metal powder mixture can be sprayed to various positions in the converter, effectively ensuring the cleaning effect. Preferably, the nozzle 23 is a detachable consumable and does not need water cooling after use.

[0047] In some embodiments, the spray gun 2 also includes a rotating mechanism 24 and a rotating joint 25; the rotating mechanism 24 is arranged inside the trolley 1, and the driving end of the rotating mechanism 24 is rotatably connected to the gun body 21 to drive the gun body 21 to rotate axially, and the rotating joint 25 is fixedly connected to the rear end of the gun body 21, and the rotating joint 25 is rotatably connected to the front end of the oxygen supply tube 3.

[0048] The gun body 21 can rotate 360° driven by the rotating mechanism 24, and the nozzle 23 can be accurately positioned at the slag position that needs to be sprayed and cleaned to ensure cleaning efficiency. At the same time, the setting of the rotating joint 25 can make the oxygen supply tube 3 more conveniently detachably connected to the gun body 21.

[0049] In some embodiments, the converter mouth slag cleaning device also includes a delivery mechanism 6, and the delivery mechanism 6 includes a driving part 61 and a delivery arm 62; the driving part 61 is arranged inside the trolley 1, and the driving part 61 is fixedly connected to the bottom of the rotating mechanism 24, and the delivery arm 62 is passed through the trolley 1 and is spaced below the gun body 21, and the delivery arm 62 is rotatably connected to the trolley 1, and the slag blocking mark 12 is provided at the front end of the delivery arm 62.

[0050] After closing the discharge valve 42 and the oxygen supply pipe 3, the trolley 1 continues to move forward until the slag stop mark 12 is vertically above the converter outlet, and the driving unit 61 drives the delivery arm 62 to drop the slag stop mark 12. The slag stop mark 12 falls into the slag, reducing the amount of slag during the steel-discharging process, thereby improving the quality of molten steel, not squeezing out normal converter operations, and ensuring the smooth progress of subsequent processes.

[0051] In some embodiments, the converter mouth slag cleaning device also includes a support assembly 7, the support assembly 7 includes a support column 71 and a support frame 72, the bottom of the support column 71 is fixedly connected to the inside of the trolley 1, the support frame 72 is rotatably connected to the top of the support column 71, the support frame 72 is sleeved on the delivery arm 62 and the gun body 21, the support frame 72 is fixedly connected to the delivery arm 62, and the support frame 72 is rotatably connected to the gun body 21.

[0052] Exemplarily, the gun body 21 and the delivery arm 62 located outside the trolley 1 are also provided with support components to ensure that the converter port slag cleaning device has a certain stability when the gun body 21 rotates above the delivery arm 62, which is conducive to stably arranging the gun body 21 and the delivery arm 62 in the trolley 1. When preparing to deliver the slag stopper 12, the delivery arm 62 can swing back and forth with the connection between the support frame 72 and the support column 71 as a fulcrum, so that the slag stopper 12 is aligned vertically above the converter outlet, and finally the driving unit 61 drives the delivery arm 62 to release the slag stopper 12, and the slag stopper 12 falls freely into the steel slag.

[0053] In some embodiments, the converter mouth slag cleaning device also includes a lifting mechanism 8; the lifting mechanism 8 is fixedly connected to the inside of the trolley 1, and the driving end of the lifting mechanism 8 is fixedly connected to the bottom end of the driving part 61. The lifting mechanism 8 drives the driving part 61 and the rotating mechanism 24 to move up and down, thereby driving the spray gun 2 and the delivery mechanism 6 to swing up and down with the top of the support column 71 as the fulcrum.

[0054] When the nozzle 23 sprays oxygen and metal powder, the lifting mechanism 8 drives the gun body 21 to swing up and down with the top of the support column 71 as the fulcrum, which is beneficial for the nozzle 23 to clean the slag at various locations inside the converter; when the slag stopper 12 is released, the lifting mechanism 8 can also drive the front end of the release arm 62 to rise or fall to align with the release position of the slag stopper 12, so that the slag stopper 12 can fall into the designated position smoothly.

[0055] This embodiment also provides a method for cleaning the converter port slag cleaning device, comprising:

[0056] S1, adding metal powder into the spraying bin 41;

[0057] S2, the trolley 1 moves so that the nozzle 23 extends to the slag hanging position of the converter port, and the oxygen supply pipe 3 starts to supply oxygen;

[0058] S3, opening the discharge valve 42, so that oxygen sprays the metal powder to the slag position of the converter port, and at the same time, the rotating mechanism 24 drives the gun body 21 to rotate to spray the mixture of oxygen and metal powder to the slag position of the converter port, and sprays until the slag is cleaned under the set conditions;

[0059] S4, closing the feed valve 42 and the oxygen supply pipe 3;

[0060] S5, the trolley 1 puts the slag stopper 12 into the converter outlet;

[0061] S6. The trolley 1 moves back to the standby position.

[0062] Preferably, 10 kg of iron powder is loaded into the spray bin 41, and the spray bin 41 is pressurized to 1.6 MPa. The converter is tilted 90° to start tapping, the trolley 1 moves forward to extend the nozzle 23 to the slag position at the converter mouth, the oxygen supply pipe 3 is opened to start blowing oxygen, and then the discharge valve 42 is opened to start spraying iron powder at a feeding rate of 3 kg / min. At the same time, the rotating mechanism 24 drives the gun body 21 to start rotating, and the nozzle 23 is aimed at the slag position to clean the slag. Among them, the oxygen flow rate during oxygen supply is 1500 Nm 3 / h, the pressure is 1.6MPa, and the slag cleaning time is set to 2min per furnace. After the cleaning is completed, first close the discharge valve 42, then close the oxygen supply pipe 3, and the trolley 1 continues to move forward until the slag stop mark 12 is vertically above the steel outlet of the converter. The lifting mechanism 8 cooperates with the drive unit 61 to drive the delivery arm 62 to drop the slag stop mark 12, and the slag stop mark 12 enters the steel slag. Finally, the trolley 1 withdraws to the standby position. The slag cleaning task can be completed during the steel tapping time without the need to arrange additional shutdown time. At this time, the process steps of putting in the slag stop mark 12 have also been completed, and the normal converter operation will not be squeezed out. The converter can continue the subsequent process flow, effectively improving the converter operation rate by 10%. With the help of additional powder spraying combustion heat release, slag with any iron content can be quickly removed, greatly improving the effective operation rate of the converter.

[0063] Preferably, the setting conditions of S3 include: the feeding speed of the metal powder of the feeding valve 42 is 2-5 kg / min, the flow rate of oxygen in the oxygen supply pipe 3 is 1500 Nm 3 / h. After many tests and inspections, the inventors controlled the supply flow of metal powder and oxygen to ensure that the slag can be cleaned within the steel-making time, effectively improving the operating rate of the converter.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A converter port slag cleaning device, characterized in that: include: Trolley, spray gun, oxygen supply pipe and powder spraying mechanism; The bottom of the trolley is provided with moving wheels, and a slag stopper for being put into the converter can be detachably mounted on the trolley; The powder spraying mechanism comprises a spraying bin, a discharge valve and a powder supply part, wherein the spraying bin has a conveying cavity for conveying metal powder, the discharge valve is fixedly connected to the bottom end of the spraying bin, the powder supply part is fixedly connected to the bottom end of the discharge valve, and the powder supply part has a powder channel for conveying metal powder, and the conveying cavity is connected or closed with the powder channel by adjusting the discharge valve; The spray gun comprises a gun body, the gun body is arranged inside the trolley, the gun body is rotatably connected to the trolley, the front end of the oxygen supply pipe is connected to the rear end of the gun body, the gun body has an oxygen channel for conveying oxygen, a mixing part is rotatably sleeved on the gun body, the mixing part is located in the trolley, the mixing part is fixedly connected to the bottom end of the powder supply part, the gun body also has a mixing channel for conveying a mixture of oxygen and metal powder, the mixing part connects the powder channel, the oxygen channel and the mixing channel; A nozzle is provided at the front end of the gun body, and the nozzle is located outside the trolley. The nozzle sprays a mixture of oxygen and metal powder to the slag hanging position of the converter mouth.

2. The converter port slag cleaning device according to claim 1, characterized in that: The powder supply part is arranged in the trolley, the powder supply part is fixedly connected to the trolley, the top end of the powder supply part is communicated with the upper end surface of the trolley, and the discharge valve is fixedly connected to the top end of the trolley.

3. The converter port slag cleaning device according to claim 1, characterized in that: It also includes a boosting pipe, which is fixedly connected to the outer periphery of the spraying bin. The boosting pipe has a gas channel for conveying gas, and the gas channel is connected to the conveying cavity.

4. The converter port slag cleaning device according to claim 3, characterized in that: The powder spraying mechanism also includes a storage bin and a sealing valve. The storage bin has a storage cavity for storing metal powder. The sealing valve is fixedly connected to the bottom end of the storage bin. The sealing valve is fixedly connected to the top end of the spraying bin. The storage cavity is connected to or closed with the conveying cavity by adjusting the sealing valve.

5. The converter port slag cleaning device according to claim 1, characterized in that: The nozzle is arranged in an inclined manner, and gradually moves away from the central axis of the gun body from the back to the front.

6. The converter port slag cleaning device according to claim 5, characterized in that: The spray gun also includes a rotating mechanism and a rotating joint; The rotating mechanism is arranged inside the trolley, the driving end of the rotating mechanism is rotatably connected to the gun body to drive the gun body to rotate axially, the rotating joint is fixedly connected to the rear end of the gun body, and the rotating joint is rotatably connected to the front end of the oxygen supply tube.

7. The converter port slag cleaning device according to claim 6, characterized in that: It also includes a delivery mechanism, which includes a driving part and a delivery arm; The driving part is arranged inside the trolley, the driving part is fixedly connected to the bottom of the rotating mechanism, the delivery arm is passed through the inside of the trolley and is arranged below the gun body at intervals, the delivery arm is rotatably connected to the trolley, and the slag blocking mark is provided at the front end of the delivery arm.

8. The converter port slag cleaning device according to claim 7, characterized in that: It also includes a support assembly, which includes a support column and a support frame, the bottom of the support column is fixedly connected to the inside of the trolley, the support frame is rotatably connected to the top of the support column, the support frame is sleeved on the delivery arm and the gun body, the support frame is fixedly connected to the delivery arm, and the support frame is rotatably connected to the gun body.

9. The converter port slag cleaning device according to claim 8, characterized in that: Also includes a lifting mechanism; The lifting mechanism is fixedly connected to the inside of the trolley, and the driving end of the lifting mechanism is fixedly connected to the bottom end of the driving part. The lifting mechanism drives the driving part and the rotating mechanism to move up and down, thereby driving the spray gun and the delivery mechanism to swing up and down with the top of the support column as the fulcrum.

10. A method for cleaning a converter port slag cleaning device according to any one of claims 1 to 9, characterized in that: include: S1, adding metal powder into the spraying bin; S2, the trolley moves so that the nozzle extends to the slag hanging position of the converter port, and the oxygen supply pipe starts to supply oxygen; S3, opening the discharge valve to allow oxygen to spray metal powder to the slag position of the converter port, while the rotating mechanism drives the gun body to rotate to spray the mixture of oxygen and metal powder to the slag position of the converter port, and spraying until the slag is cleaned under the set conditions; S4, closing the feed valve and the oxygen supply pipe; S5, the trolley puts the slag stopper into the converter outlet; S6. The trolley moves back to the standby position.

Images