Nitrogen conveying gun for converter protection

Abstract

The utility model relates to the technical field of steelmaking equipment, and discloses a nitrogen conveying gun for converter protection. The nitrogen conveying gun for converter protection comprises a sliding rail, a sliding block is movably installed in the sliding rail, a supporting frame is fixedly installed on the front side of the sliding rail, a motor is fixedly installed at the upper end of the supporting frame, a winding roller is installed on the outer side of a rotating shaft of the motor in a penetrating and inserting mode, and a steel cable is wound around the outer side of the winding roller. As the L-shaped branches are annularly arranged on the outer side of the branch pipe at equal 90-degree angles by taking the center of the branch pipe as a reference, a force opposite to the airflow direction is applied to the branch pipe when nitrogen is sprayed out from the nozzle, so that the branch pipe is pushed to rotate by taking the axis of the rotary joint as a reference, and the nitrogen is annularly blown to steel slag along with the rotation of the branch pipe; therefore, the steel slag can be splashed by the airflow in different directions, the number of times of adjusting the position of the conveying gun can be reduced, and the effect of improving the working efficiency is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of steelmaking equipment, in particular to a nitrogen delivery gun for converter furnace lining protection. Background Art

[0002] In order to improve the service life of the converter furnace lining, generally when the temperature of the converter slightly drops after steelmaking is completed, high-pressure nitrogen is blown into the furnace to cool the slag and splash it onto the furnace lining to form a furnace lining protection layer, thereby reducing the mechanical erosion and chemical corrosion of the furnace lining during the steelmaking process and achieving the purpose of protecting the furnace lining and increasing the furnace age.

[0003] The existing Chinese utility model patent with the reference publication number of CN201198487Y discloses a converter oxygen lance for steelmaking. The water inlet pipe and the water return pipe are bent into an arc with R≥700mm and intersect with the middle pipe of the oxygen lance to form an oval intersection line with a major diameter R≥800mm; the gun head is sealed, the inner pipe of the nozzle is lengthened, and three sealing grooves are opened in the sliding section of the inner pipe, and "O" - shaped rubber sealing rings are arranged in the sealing grooves. Since the sealing of the oxygen lance is changed to the gun head, "O" - shaped rubber sealing rings can be used, so that the sliding section of the inner pipe of the nozzle plays a compensating role to avoid the problem of the gun head bulging. Since the water inlet and return pipes intersect with the middle pipe of the oxygen lance by an oval intersection line, the flow velocity of the inlet and return water is greatly increased, the water cooling effect of the oxygen lance nozzle is significantly improved, and the service life of the oxygen lance nozzle is increased from the original 100 furnaces to about 300 furnaces.

[0004] At present, most of the ends of the delivery guns for delivering gas into the converter are fixed structures. During the process of furnace lining protection, it is necessary to continuously adjust the position of the delivery gun to make the blown nitrogen impact the slag, which is very inconvenient. And due to the influence of the structure of the existing converter gas delivery gun, the blown air flow is generally perpendicular to the slag, and not all of the slag that the air flow can splash can impact the furnace lining, resulting in a low slag coverage efficiency. Summary of the Utility Model

[0005] (1) Technical Problems to be Solved

[0006] Aiming at the deficiencies of the prior art, the utility model provides a nitrogen delivery gun for converter furnace lining protection, which has the advantages of improving the slag coverage efficiency and reducing the number of position adjustments of the delivery gun, and solves the above - mentioned technical problems.

[0007] (2) Technical Solutions

[0008] To achieve the above object, the present utility model provides the following technical solutions: A nitrogen gas delivery gun for converter furnace protection, comprising: a slide rail, inside which a slider is movably installed, a support frame is fixedly installed on the front side of the slide rail, a motor is fixedly installed at the upper end of the support frame, a winding roller is inserted outside the rotating shaft of the motor, a steel cable is wound around the outside of the winding roller, a protection tube is inserted inside the slider, a heat insulation tube is fixedly installed inside the protection tube, a cooling tube is fixedly installed inside the heat insulation tube, a delivery tube is fixedly installed inside the heat insulation tube, a rotary joint is inserted at the lower end of the delivery tube, a branch tube is fixedly installed below the rotary joint, and a nozzle is inserted at the branched end of the branch tube; the slide rail can limit the movement direction of the slider.

[0009] As a preferred technical solution of the present utility model, a sliding connection is formed between the slider and the slide rail, and the support frame is symmetrically installed mirror-image front and back with the center of the slide rail as the reference at the top of the front and back side surfaces of the slide rail; the slider can facilitate the insertion of the protection tube into the converter furnace.

[0010] As a preferred technical solution of the present utility model, the motors are symmetrically installed mirror-image front and back above the support frames on the front and back sides of the slide rail, and the front and rear ends of the winding roller are fixedly connected to the rotating shaft of the motor by insertion; the motor can drive the winding roller to rotate, and the winding roller can adjust the length of the steel cable released according to the rotation direction of the motor.

[0011] As a preferred technical solution of the present utility model, the steel cables are symmetrically wound around the front and back sides of the winding roller, and the lower end of the steel cable is fixedly connected to the slider; the steel cable can facilitate the adjustment of the position of the slider.

[0012] As a preferred technical solution of the present utility model, the protection tube is fixedly connected to the slider, the cooling tube is spiral-shaped, and the top end of the cooling tube is higher than the top end of the heat insulation tube; the protection tube can protect the internal heat insulation tube.

[0013] As a preferred technical solution of the present utility model, a rotating connection is formed between the delivery tube and the branch tube through the rotary joint, and "L"-shaped branches are annularly arranged at equal 90-degree angles with the center of the branch tube as the reference on the outside of the branch tube; the delivery tube can deliver nitrogen gas.

[0014] As a preferred technical solution of the present utility model, the branch direction of the branch tube is 45 degrees obliquely downward, and the direction of the nozzle is the same as that of the branch tube; the branch tube can facilitate the air flow to blow obliquely on the steel slag.

[0015] Compared with the prior art, the present utility model provides a nitrogen gas delivery gun for converter furnace protection, having the following beneficial effects:

[0016] 1. Through the arrangement of the branch pipe, the branch pipe is communicated with the conveying pipe. An "L"-shaped branch is annularly arranged on the outer side of the branch pipe at an equal 90-degree angle with the center of the branch pipe as the reference. The branch of the branch pipe points obliquely downward at 45 degrees. The nozzle is inserted and installed at the end of the branch of the branch pipe, and the direction of the nozzle is the same as that of the branch pipe. After nitrogen enters the inside of the branch pipe through the conveying pipe, it will be ejected from the nozzle at the end of the branch pipe. In this way, the angle between the nitrogen gas flow and the top surface of the steel slag can be made less than 90 degrees, so that the angle between the flight path of the steel slag splashed by the gas flow and the top surface of the steel slag is close to 45 degrees, thereby increasing the flight distance of the steel slag and increasing the probability of the steel slag contacting the furnace lining, so as to improve the steel slag coverage rate.

[0017] 2. Through the arrangement of the rotary joint, a rotational connection is formed between the branch pipe and the conveying pipe through the rotary joint. Since an "L"-shaped branch is annularly arranged on the outer side of the branch pipe at an equal 90-degree angle with the center of the branch pipe as the reference, when nitrogen is ejected from the nozzle, a force opposite to the gas flow direction will be applied to the branch pipe, thereby pushing the branch pipe to rotate with the axis of the rotary joint as the reference. The nitrogen will be blown onto the steel slag in a circular shape as the branch pipe rotates, so that the steel slag can be splashed by the gas flow in different directions. In this way, the number of times of adjusting the position of the conveying gun can be reduced, so as to achieve the effect of improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 is a schematic diagram of the connection structure between the slider and the steel cable of the present invention;

[0020] Figure 3 is a schematic diagram of the cross-sectional structure of the protection tube of the present invention;

[0021] Figure 4 is a schematic diagram of the nozzle installation structure of the present invention;

[0022] Among them: 1. Slide rail; 11. Slider; 12. Support frame; 13. Motor; 14. Reel; 15. Steel cable; 2. Protection tube; 21. Heat insulation tube; 22. Cooling tube; 23. Conveying pipe; 24. Rotary joint; 25. Branch pipe; 26. Nozzle. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The following further describes in detail the embodiments of the present invention in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0024] In the description of the present utility model, unless otherwise specified, the meaning of "a plurality of" is two or more; the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present utility model. In addition, terms such as "first", "second", "third", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0025] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and defined, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0026] Please refer to Figure 1 - Figure 4 , in this embodiment, a nitrogen delivery gun for converter furnace protection includes: a slide rail 1, a slider 11 is movably installed inside the slide rail 1, a support frame 12 is fixedly installed on the front side of the slide rail 1, a motor 13 is fixedly installed at the upper end of the support frame 12, a winding roller 14 is inserted and installed outside the rotating shaft of the motor 13, and a steel cable 15 is wound around the outside of the winding roller 14.

[0027] A sliding connection is formed between the slider 11 and the slide rail 1. The support frame 12 is symmetrically installed in front and back with the center of the slide rail 1 as the reference at the top of the front and back vertical surfaces of the slide rail 1. The motor 13 is symmetrically installed in front and back above the support frames 12 on both sides of the slide rail 1. The front and rear ends of the winding roller 14 are fixedly connected to the rotating shaft of the motor 13 by means of insertion. The steel cable 15 is symmetrically wound around the front and back sides of the winding roller 14, and the lower end of the steel cable 15 is fixedly connected to the slider 11.

[0028] Specifically, the length of the slide rail 1 is adjusted according to requirements. The slide rail 1 can limit the movement direction of the slider 11. The slider 11 can facilitate the protection tube 2 to extend into the converter furnace. The support frame 12 can support the motor 13. The motor 13 can drive the winding roller 14 to rotate. The winding roller 14 can adjust the length of the steel cable 15 released according to the rotation direction of the motor 13. The steel cable 15 can facilitate the adjustment of the position of the slider 11.

[0029] A protective tube 2 is installed inside the slider 11 in an interpenetrating manner. An insulating tube 21 is fixedly installed inside the protective tube 2. A cooling tube 22 is fixedly installed inside the insulating tube 21. A conveying tube 23 is fixedly installed inside the insulating tube 21. The lower end of the conveying tube 23 is installed with a rotary joint 24 in an interpenetrating manner. A branch tube 25 is fixedly installed below the rotary joint 24. The branch end of the branch tube 25 is installed with a nozzle 26 in an interpenetrating manner.

[0030] The protective tube 2 is fixedly connected to the slider 11. The cooling tube 22 is spiral. The top end of the cooling tube 22 is higher than the top end of the insulating tube 21. The conveying tube 23 and the branch tube 25 are rotationally connected through the rotary joint 24. The outer side of the branch tube 25 is provided with "L"-shaped branches in a ring at an equal 90-degree angle with the center of the branch tube 25 as the reference. The branch of the branch tube 25 points obliquely downward at 45 degrees. The direction of the nozzle 26 is the same as the direction of the branch tube 25.

[0031] Specifically, the protective tube 2 can protect the internal insulating tube 21. The insulating tube 21 can achieve an insulating effect. The cooling tube 22 can facilitate the cooling water to absorb the heat of the insulating tube 21. The conveying tube 23 can convey nitrogen. The rotary joint 24 can facilitate the rotation of the branch tube 25 under the push of gas. The branch tube 25 can facilitate the air flow to blow obliquely towards the steel slag nozzle 26 to increase the gas flow rate.

[0032] During use, the branch tube 25 is communicated with the conveying tube 23. The outer side of the branch tube 25 is provided with "L"-shaped branches in a ring at an equal 90-degree angle with the center of the branch tube 25 as the reference. The branch of the branch tube 25 points obliquely downward at 45 degrees. The nozzle 26 is installed at the branch end of the branch tube 25. The direction of the nozzle 26 is the same as the direction of the branch tube 25. After nitrogen enters the inside of the branch tube 25 through the conveying tube 23, it will be ejected from the nozzle 26 at the end of the branch tube 25. This method can make the angle between the nitrogen gas flow and the top surface of the steel slag less than 90 degrees, so that the angle between the flight path of the steel slag splashed by the gas flow and the top surface of the steel slag is close to 45 degrees, to increase the flight distance of the steel slag, to increase the probability of the steel slag contacting the furnace lining, thereby increasing the steel slag coverage rate. The branch tube 25 and the conveying tube 23 are rotationally connected through the rotary joint 24. Since the outer side of the branch tube 25 is provided with "L"-shaped branches in a ring at an equal 90-degree angle with the center of the branch tube 25 as the reference, when the nitrogen gas is ejected from the nozzle 26, a force opposite to the gas flow direction will be applied to the branch tube 25, thereby pushing the branch tube 25 to rotate with the axis of the rotary joint 24 as the reference. The nitrogen gas will blow towards the steel slag in a ring as the branch tube 25 rotates, so that the steel slag can be splashed by the gas flow in different directions. This method can reduce the number of times of adjusting the position of the conveying gun, so as to achieve the effect of improving work efficiency.

[0033] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A nitrogen delivery gun for converter protection, characterized in that: include: A slide rail (1), wherein a slider (11) is movably installed inside the slide rail (1), a support frame (12) is fixedly installed on the front side of the slide rail (1), a motor (13) is fixedly installed on the upper end of the support frame (12), a winding roller (14) is inserted and installed on the outer side of the rotating shaft of the motor (13), and a steel cable (15) is wound around the outer side of the winding roller (14), a protection tube (2) is inserted and installed inside the slider (11), a heat-insulating tube (21) is fixedly installed inside the protection tube (2), a cooling tube (22) is fixedly installed inside the heat-insulating tube (21), a conveying tube (23) is fixedly installed inside the heat-insulating tube (21), a rotary joint (24) is inserted and installed at the lower end of the conveying tube (23), a branch tube (25) is fixedly installed below the rotary joint (24), and a nozzle (26) is inserted and installed at the branch end of the branch tube (25).

2. The nitrogen delivery gun for converter protection according to claim 1 is characterized in that: The slider (11) is slidably connected to the slide rail (1), and the support frame (12) is installed at the top of the front and rear side facades of the slide rail (1) in a mirror-symmetrical manner with the center of the slide rail (1) as a reference.

3. The nitrogen delivery gun for converter protection according to claim 1 is characterized in that: The motor (13) is installed above the support frames (12) on the front and rear sides of the slide rail (1) in a mirror-symmetrical manner, and the front and rear ends of the winding roller (14) are fixedly connected to the rotating shaft of the motor (13) by interlacing.

4. The nitrogen delivery gun for converter protection according to claim 1 is characterized in that: The steel cable (15) is symmetrically wound around the front and rear sides of the winding roller (14), and the lower end of the steel cable (15) is fixedly connected to the slider (11).

5. The nitrogen delivery gun for converter protection according to claim 1, characterized in that: The protection tube (2) is fixedly connected to the slider (11); the cooling tube (22) is spiral-shaped; and the top end of the cooling tube (22) is higher than the top end of the insulation tube (21).

6. The nitrogen delivery gun for converter protection according to claim 1, characterized in that: The delivery pipe (23) is rotatably connected to the branch pipe (25) via a rotary joint (24), and an "L"-shaped branch is provided in a ring shape at a 90-degree angle with the center of the branch pipe (25) as a reference on the outer side of the branch pipe (25).

7. The nitrogen delivery gun for converter protection according to claim 1, characterized in that: The branch of the branch pipe (25) points obliquely downward at 45 degrees, and the direction of the nozzle (26) is consistent with the direction of the branch pipe (25).

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