Converter oxygen lance slag removal device capable of automatically adjusting tension

Abstract

The invention belongs to the field of steelmaking converter smelting, and particularly relates to a self-tension-adjusting converter oxygen lance slag removal device which comprises a fixed support, a movable support, a slag removal assembly and a linear driving assembly. The slag removing assembly is arranged on the movable support, the movable support is arranged on the fixed support in a sliding mode and driven by the linear driving assembly fixedly arranged on the fixed support, so that the movable support drives the slag removing assembly to be close to or away from the oxygen lance, the slag removing device further comprises a balancing weight and a flexible rope, and the fixed end of the flexible rope is fixedly connected to the movable support. The flexible rope extends from the fixed end to the direction away from the slag removal assembly, a fixed pulley is arranged on the fixed support, and after the flexible rope bypasses the fixed pulley, the free end is fixedly connected with the balancing weight. According to the method, the risk that the removing efficiency is reduced or the lifting mechanism is overloaded possibly caused under the extreme slag adhering working condition that the amount of steel slag adhering to the surface of the oxygen lance is very large or the adhesive force is very strong can be avoided, slag removing is sufficient and efficient, and the method is suitable for removing slag of the oxygen lance in the smelting process of a steel-making converter.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of steelmaking converter smelting, and particularly relates to a self-adjusting tension converter oxygen lance slag removal device. BACKGROUND

[0002] In the steelmaking converter smelting technology, the converter oxygen lance is the core equipment of the oxygen top-blown converter steelmaking, and its main function is to inject high-pressure oxygen at high speed into the molten pool in the converter to complete the physical and chemical reactions required for steelmaking. The oxygen lance mainly includes a nozzle with a porous structure, a lance body with a cylindrical structure, and a lance tail for connecting a lifting mechanism (such as a steel wire rope and a winch) from bottom to top.

[0003] Multiple reasons cause the lance body to easily form nodules and adhere to slag during the blowing process: 1. Spattering of steel slag; during the converter blowing process, the oxygen jet impacts the surface of the molten pool, causing the spattering of steel slag. These spattered steel slag will adhere to the surface of the oxygen lance, and with the increase in the number of blowing, it will gradually accumulate to form adhered slag. 2. Chemical reaction; during blowing, the high-temperature environment around the oxygen lance causes complex chemical reactions between the steel liquid and the slag, generating some sticky substances, which will adhere to the oxygen lance and become part of the adhered slag. 3. Non-uniform cooling of the oxygen lance; if the oxygen lance is not uniformly cooled, the local temperature is too high, which will cause the oxidation of the metal on the surface of the lance body, forming an oxide skin, which is easy to absorb steel slag particles and promote the formation of adhered slag.

[0004] Nodules and adhered slag can cause multiple hazards. First, it increases the equipment load and failure rate: the adhered slag nodule increases the overall weight of the oxygen lance, especially the additional weight of the lower part of the lance body, which causes additional mechanical load to the lifting mechanism. In severe cases, large slag nodules may accidentally collide or scratch with the furnace mouth, smoke hood and other equipment during lifting, further increasing the failure probability. Second, it may further cause safety accidents: during the blowing process or when the lance is lifted, large slag nodules may suddenly fall off. If the falling slag blocks fall into the high-temperature molten pool, it will cause splashing, threatening the safety of the equipment and personnel; if they fall in the area below the furnace, they may also cause equipment damage or cleaning difficulties.

[0005] Currently, the main measures taken by the industry to address the problem of converter oxygen lance slag sticking include: optimizing the blowing process to reduce steel slag splashing, improving the oxygen lance design (such as the nozzle structure and cooling system) to reduce the sticking tendency, coating the oxygen lance surface with an anti-sticking slag coating to inhibit adhesion, and periodically cleaning the oxygen lance to remove the formed slag. Among them, mechanical cleaning is a widely used direct cleaning method, usually with the help of special slag cleaning equipment. For example, in the Chinese patent application with publication number CN111690788A, a converter oxygen lance slag scraping device is disclosed, two scraper devices are folded and attached to the outer surface of the oxygen lance by a linear drive device, as the oxygen lance is lifted, the scraper device scrapes and cleans the slag. This scraper type slag cleaning device has certain effect in cleaning conventional slag. However, when the amount of steel slag adhering to the surface of the oxygen lance is particularly large or the adhesion force is particularly strong in extreme slag sticking conditions, the device may face the following challenges: during the slag cleaning process, the scraper in working state exerts a downward scraping force on the oxygen lance surface to remove the slag, this scraping force will be superimposed on the self-weight of the oxygen lance, resulting in an increase in the tension of the lifting mechanism required to lift the oxygen lance. In practice, to deal with the risk of increased tension, the operator sometimes chooses to partially retract the linear drive device to reduce the pressure of the scraper on the oxygen lance, thereby reducing the instantaneous tension. However, according to the principles of mechanics, this will also correspondingly weaken the scraping force of the scraper on the slag, which may result in a decrease in cleaning efficiency. On the other hand, if the scraper continues to clean while maintaining the working pressure, if the increased tension load exceeds the design margin of the lifting mechanism (such as the steel wire rope and winch), it may cause an overload risk, potentially increasing the likelihood of equipment failure or safety accidents (such as steel wire rope failure). SUMMARY

[0006] To solve the above problems in the prior art, the present application aims to provide a self-adjusting tension converter oxygen lance slag cleaning device to reduce the risk of overloading the lifting mechanism while ensuring the efficiency of slag cleaning.

[0007] To achieve the above-mentioned purpose, the technical solution adopted by the present application is as follows: a self-adjusting tension converter oxygen lance slag cleaning device, comprising a fixed support, a movable support, a slag cleaning assembly and a linear drive assembly; the slag cleaning assembly is arranged at one end of the movable support facing the oxygen lance, the movable support is slidingly arranged on the fixed support and driven by the linear drive assembly fixed on the fixed support, so that the movable support drives the slag cleaning assembly to approach or move away from the oxygen lance, further comprising a counterweight and a flexible rope, the two ends of the flexible rope are fixed end and free end respectively, the fixed end of the flexible rope is fixedly connected to the movable support, the flexible rope extends from the fixed end to the direction away from the slag cleaning assembly, a fixed pulley is arranged on the fixed support, and the free end of the flexible rope is fixedly connected with the counterweight after passing through the fixed pulley.

[0008] As a limitation of the present application: the fixed end of the flexible rope is fixedly connected to one end of the movable support facing the oxygen lance.

[0009] As a limitation of the present application: the slag removal assembly comprises a slag removal head rotatably arranged on the movable support, the slag removal head is a rotary body with a horizontal rotary shaft, and an arc-shaped recess is formed on the outer contour of the slag removal head and matched with the oxygen lance; the slag removal assembly further comprises a rotary drive device for driving the slag removal head to rotate around the rotary shaft.

[0010] As a limitation of the present application: the central angle of the arc-shaped recess is 180°.

[0011] As a limitation of the present application: the surface of the arc-shaped recess of the slag removal head is uniformly provided with a plurality of slag removal blades.

[0012] As a limitation of the present application: the rotary drive device comprises a driving motor fixedly arranged on the movable support, and the output end of the driving motor is connected with the slag removal head through a belt transmission structure.

[0013] As a limitation of the present application: two driving motors are fixedly arranged on the movable support, and the two ends of the slag removal head are fixedly provided with outwardly extending rotary shafts, and the output ends of the two driving motors are respectively connected with the two ends of the slag removal head through transmission belts.

[0014] As a limitation of the present application: a plurality of fixed pulleys are fixedly arranged on the fixed support, and the movable support is slidably arranged on the fixed support through the fixed pulleys.

[0015] As a limitation of the present application: the linear drive assembly comprises a cylinder, and the piston end of the cylinder is fixedly connected with the movable support.

[0016] As a limitation of the present application: two slag removal devices are arranged, and the two slag removal devices are symmetrically arranged with the oxygen lance shaft as the symmetry axis.

[0017] Compared with the prior art, the present application has the following advantages: The flexible rope and the counterweight can apply a force opposite to the linear drive device to the movable platform, so that the slag removal assembly can overcome the thrust of the linear drive device and slide away from the oxygen lance in the extreme slag sticking condition that the amount of steel slag adhered to the surface of the oxygen lance is particularly large or the adhesion force is particularly strong, so that the slag removal assembly is no longer continuously pressed against the oxygen lance, the tension of the steel wire rope is prevented from increasing with the rising of the oxygen lance, the tension of the steel wire rope is self-adjusted, and safety accidents are avoided. (2) The slag removal head is a rotary body with an arc-shaped recess, the arc-shaped recess can be matched with the cylindrical outer contour of the oxygen lance body, the slag removal is sufficient, and the slag removal blades are uniformly distributed on the surface of the arc-shaped recess, so that the slag removal blades can roll to remove the steel slag when the slag removal head rotates under the action of the rotary drive device, the slag removal efficiency is ensured under the premise of appropriately reducing the tension of the steel wire rope.

[0018] In summary, the present application can avoid the risk of cleaning efficiency reduction or lifting mechanism overload caused by the extremely sticky slag condition when the amount of steel slag adhered to the surface of the oxygen lance is particularly large or the adhesion force is particularly strong, and the slag is fully and efficiently cleaned, which is suitable for the slag cleaning of the oxygen lance in the steelmaking converter. BRIEF DESCRIPTION OF DRAWINGS

[0019] The present application will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0020] Fig. 1 Figure 1 is a front view of a slag cleaning device according to an embodiment of the present application. Fig. 2 Figure 2 is a top view of a movable support according to an embodiment of the present application. Fig. 3 Figure 3 is a structural schematic view of a slag cleaning head according to an embodiment of the present application.

[0021] Figure 1 is a front view of a slag cleaning device according to an embodiment of the present application. DETAILED DESCRIPTION

[0022] The preferred embodiments of the present application will be described below in conjunction with the accompanying drawings. It should be understood that the self-adjusting tension converter oxygen lance slag cleaning device described herein is a preferred embodiment, which is used to illustrate and explain the present application, and does not constitute a limitation on the present application.

[0023] The "long", "wide", and other orientation words or position relationships described in the present application are based on the orientation relationship of the drawings in the present application, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element must have a specific orientation, a specific orientation structure and operation, and therefore cannot be understood as a limitation on the content of the protection of the present application.

[0024] The present embodiment is Figs. 1-3 as shown, a self-adjusting tension converter oxygen lance slag cleaning device, comprising a fixed support, a movable support 4, a slag cleaning assembly, a linear drive assembly 6, a counterweight 12 and a flexible rope 13.

[0025] The fixed support in the embodiment is fixed on the platform girder of the converter, and in other embodiments, the fixed support can also be fixed on other positions of the converter having a fixed structure. The fixed support comprises a horizontally arranged first frame body 1, a second frame body 2 arranged above the first frame body 1, and a spacing between the first frame body 1 and the second frame body 2, and a third frame body 3 fixed on the side of the first frame body 1 and the second frame body 2 away from the oxygen lance 14, and the height of the third frame body 3 is matched with the second frame body 2. The movable support 4 is slidingly arranged on the fixed support. Specifically, two rows of fixed pulleys 5 arranged along the length direction are fixed on the upper surface of the first frame body 1, and two rows of fixed pulleys 5 arranged along the length direction are fixed on the lower surface of the second frame body 2. The movable support 4 is a rectangular frame structure, the length direction of the movable support 4 is matched with the length direction of the first frame body 1, and the width direction of the movable support 4 is matched with the spacing between the two rows of fixed pulleys 5 of the first frame body 1 and the second frame body 2, so that the two edges of the movable support 4 in the length direction are clamped by the fixed pulleys 5 on the upper surface of the first frame body 1 and the fixed pulleys 5 on the lower surface of the second frame body 2, realizing the sliding arrangement of the movable support 4. The number, size and arrangement spacing of the fixed pulleys 5 can be adjusted according to the needs. In other embodiments, the sliding arrangement of the movable support 4 can also be realized by the structure of guide rail and sliding block. The movable support 4 is driven by a linear drive assembly 6 fixed on the third frame body 3. Specifically, the linear drive assembly 6 in the embodiment is a cylinder arranged along the width direction, and the piston end of the cylinder is connected to the end of the movable support 4 away from the oxygen lance 14. When the cylinder is extended, it drives the movable support 4 to slide towards the oxygen lance 14, and when the cylinder is retracted, it drives the movable support 4 to slide away from the oxygen lance 14.

[0026] The slag removal assembly is arranged at the end of the movable support 4 facing the oxygen lance 14. Specifically, the slag removal assembly comprises a slag removal head 7 rotatingly arranged on the movable support 4. The two edges of the end of the movable support 4 close to the oxygen lance 14 extend towards the oxygen lance 14, and the slag removal head 7 is rotatingly arranged on the two edges extending towards the oxygen lance 14. The slag removal head 7 is a rotary body, the rotary shaft is along the horizontal direction and along the width direction, and the two ends of the slag removal head 7 are fixedly provided with rotating shafts 8 extending outward, which are rotatingly connected to the two edges of the movable support 4 extending towards the oxygen lance 14 through the rotating seat, so that the slag removal head 7 can be close to and abut against the lance body of the oxygen lance 14. An arc-shaped recess is formed on the outer contour of the slag removal head 7, which is matched with the oxygen lance 14. Here, the matching means that the curvature of the arc-shaped recess is consistent with the curvature of the outer contour of the oxygen lance 14, and the central angle corresponding to the arc-shaped recess is 180°. In this way, the two opposite slag removal assemblies can completely cover the oxygen lance 14 in the circumferential direction, and the slag removal is more thorough. Further, the arc-shaped recess of the slag removal head 7 is composed of a plurality of step structures gradually changing in diameter, and the step structures can form a plane. A plurality of slag blades 9 are uniformly fixed on the surface of the step structure. Specifically, as shown in Fig. 3As shown, the slag removing blade 9 is of a cylindrical structure, made of alloy material, high in strength and more durable, and sequentially includes a conical tip, a cylindrical body, a shoulder and a cylindrical bottom from top to bottom. The shoulder and the cylindrical bottom of the slag removing blade 9 are embedded in the slag removing head 7, and the conical tip and the cylindrical body are exposed from the slag removing head, and the conical tip is outward, having sharpness on the basis of strength. The slag removing assembly further includes a rotating driving device for driving the slag removing head 7 to rotate around the rotating shaft thereof. The rotating driving device includes two driving motors 10 fixed on the movable support 4, and the output ends of the two driving motors 10 are respectively connected with two rotating shafts 8 at two ends of the slag removing head 7 through transmission belts 11. The motor drives the slag removing head 7 to rotate around the rotating shaft thereof, and the slag removing blade 9 can remove the adhered slag on the oxygen lance 14.

[0027] In order to realize self-adjustment of the tension of the steel wire rope of the lifting mechanism, the embodiment further provides a counterweight 12 and a flexible rope 13. The two ends of the flexible rope 13 are a fixed end and a free end respectively, the fixed end of the flexible rope 13 is fixed on the center line in the width direction of the movable support 4 to ensure the stability of the structure, and in the embodiment, the fixed end of the flexible rope 13 is fixed on the end of the movable support 4 facing the oxygen lance 14. The flexible rope 13 extends away from the slag removing assembly (or the oxygen lance 14) from the fixed end to ensure that a force counteracting the linear driving assembly 6 is applied to the movable support 4, and a fixed pulley 5 is fixed on the center line in the width direction of the fixed support (for a clearer expression of the structure, Fig. 2 The position of the fixed pulley 5 is shown in the figure), and the free end of the flexible rope 13 is fixedly connected with the counterweight 12, the counterweight 12 is lowered under the action of gravity, and the movable support 4 has a movement tendency away from the oxygen lance 14 under the action of gravity of the counterweight 12. When the oxygen lance 14 adheres to more and more firm steel slag, the gravity of the counterweight 12 can overcome the forward (close to the oxygen lance 14) thrust of the linear driving device, so that the slag removing head 7 can retreat, i.e. move away from the oxygen lance 14, and no longer continuously abut against the oxygen lance 14, thus avoiding the sharp increase of the tension of the steel wire rope with the rising of the oxygen lance 14, thereby avoiding the breakage of the steel wire rope. The weight of the counterweight 12 and the setting position of the fixed pulley 5 for changing the direction of the counterweight 12 can be adjusted according to actual needs.

[0028] Since the slag removing range of a single slag removing head 7 can cover half of the oxygen lance 14, the slag removing device is provided with two slag removing heads 7, and is symmetrically arranged with the axis of the oxygen lance 14 as the symmetry axis. In this way, the slag removing heads 7 of the two slag removing devices can realize full coverage of the oxygen lance 14, and the slag removing is more comprehensive.

[0029] When the oxygen lance 14 is ready to be lifted to the blowing position, the cylinder is extended to drive the movable support 4 to slide to the position close to the oxygen lance 14, so that the two slag removing heads 7 jointly surround the oxygen lance 14, the driving motor 10 is rotated to drive the two slag removing heads 7 to rotate to the position opposite to the oxygen lance 14, and as the oxygen lance 14 is lifted to the blowing position, the slag removing blades 9 on the slag removing heads 7 remove the adhered slag on the oxygen lance 14.

Claims

1. A self-adjusting tension converter oxygen lance slag cleaning device, comprising a fixed support, a movable support, a slag cleaning assembly and a linear drive assembly; the slag cleaning assembly is arranged at the end of the movable support facing the oxygen lance, the movable support is slidingly arranged on the fixed support and is driven by the linear drive assembly fixed on the fixed support, so that the movable support drives the slag cleaning assembly to approach or move away from the oxygen lance, characterized in that: The counterweight and the flexible rope are further included, two ends of the flexible rope are fixed end and free end respectively, the fixed end of the flexible rope is fixedly connected to the movable support, the flexible rope extends from the fixed end to the direction away from the slag cleaning assembly, the fixed support is provided with a fixed pulley, the free end is fixedly connected to the counterweight after the flexible rope passes through the fixed pulley. ​ 2. The self-adjusting tension converter lance slag cleaning device of claim 1, wherein: The fixed end of the flexible rope is fixedly connected to one end of the movable support facing the oxygen lance.

3. The self-adjusting tension converter lance slag cleaning device of claim 2, wherein: The slag cleaning assembly comprises a slag cleaning head rotatably arranged on the movable support, the slag cleaning head is a rotary body with a rotary shaft in a horizontal direction, and an arc-shaped inner recess compatible with the oxygen lance is formed on the outer contour of the slag cleaning head, and the slag cleaning assembly further comprises a rotary driving device for driving the slag cleaning head to rotate around the rotary shaft thereof.

4. The self-adjusting tension converter lance slag cleaning device of claim 3, wherein: The central angle of the arc-shaped inner recess corresponds to 180°.

5. The self-adjusting tension converter lance slag cleaning device of claim 4, wherein: The surface of the arc-shaped inner recess of the slag cleaning head is uniformly and fixedly provided with a plurality of slag cleaning blades.

6. The self-adjusting tension converter lance slag device of claim 5, wherein: The rotary driving device comprises a driving motor fixedly arranged on the movable support, and the output end of the driving motor is connected to the slag cleaning head through a belt transmission structure.

7. The self-adjusting tension converter lance slag device of claim 6, wherein: Two driving motors are fixedly arranged on the movable support, and two shafts outwardly extending are fixedly arranged at two ends of the slag cleaning head, and the output ends of the two driving motors are respectively connected to the two ends of the slag cleaning head through transmission belts.

8. The self-adjusting tension converter lance slag cleaning device according to any one of claims 1-7, characterized in that: A plurality of fixed pulleys are fixedly arranged on the fixed support, and the movable support is slidably arranged on the fixed support through the fixed pulleys.

9. The self-adjusting tension converter lance slag cleaning device of claim 8, wherein: The linear driving assembly comprises a gas cylinder, and the piston end of the gas cylinder is fixedly connected to the movable support.

10. The self-adjusting tension converter lance slag cleaning device according to any one of claims 1-7, 9, wherein: The slag cleaning device is provided in two, and is symmetrically arranged with the oxygen lance shaft as the symmetry axis.

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