Embedded positioning block device with double-guiding and internal cooling functions

Abstract

The utility model belongs to the technical field of ferrous metal smelting, and relates to an embedded positioning block device with double-guiding and internal cooling functions, which comprises a nitrogen sealing seat, an oxygen lance pipeline penetrates through the nitrogen sealing seat, a nitrogen sealing ring is arranged on the rear side of the oxygen lance pipeline, and the oxygen lance pipeline comprises a water inlet pipe cavity, a water return pipe cavity and an oxygen pipe cavity. A water-cooling positioning block is arranged on the outer wall of the oxygen lance pipeline, a groove is formed in the outer wall of the oxygen lance pipeline, the periphery of the bottom of the water-cooling positioning block is machined into a chamfer, a through hole is formed in the water-cooling positioning block, and the tail end of the through hole is connected with a through cavity. According to the utility model, the defects existing in the use process in the prior art are overcome, the positioning block with the water cooling function effectively solves the problems of melting and burning loss in a high-temperature environment, the correct position of the nitrogen sealing ring when the oxygen lance is lifted is ensured, and the normal lifting of the oxygen lance is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of ferrous metal smelting, and particularly relates to an oxygen lance device for an oxygen top-bottom combined blowing converter, specifically an embedded positioning block device with double guiding and internal cooling functions. Background Technique

[0002] The oxygen lance is an important mechanism of an oxygen top-blown converter, which consists of a lance head, a lance body, a nitrogen seal ring, a connecting pipe, and a lance seat. Among them, the height position of the nitrogen seal ring on the oxygen lance during the lifting process of the oxygen lance is determined by a metal positioning block welded on the surface of the lance body. The lance body is mainly the main channel for oxygen and cooling water media. As Figures 1-3 shown, it consists of three-layer medium pipe cavities of water inlet, water return, and oxygen. 3 - 4 right trapezoidal positioning blocks made of Q235 are welded on the circumferential direction of the outer pipe wall of the water inlet pipe cavity.

[0003] The existing positioning block is welded to the outer pipe wall of the water inlet cavity of the lance body. The size of the existing positioning block is 100×30×80mm. After welding, there is no tight contact between the other bottom surface area outside the weld of the existing positioning block and the arc surface of the lance body, and there is still a gap of about 0.05 - 0.1mm between them. It is not completely an integral part with the lance body. The existence of the tiny gap limits the heat conduction rate of the positioning block, and the area with effective heat conduction accounts for about 30% of the bottom area of the positioning block. Especially in the high-temperature environment of 2000°C in the furnace, the heat conduction rate of the positioning block is extremely important, which is an important index to determine whether it is burned out.

[0004] After the nitrogen seal ring of the oxygen lance pipeline falls onto the nitrogen seal seat during smelting, the existing positioning block enters the inside of the converter together with the lance body. It is washed by the high-temperature gas flow of nearly 2000°C in the furnace, seriously exceeding the melting point temperature of the metal of the positioning block. The heat transfer coefficient of ferrous metals is low, and coupled with the fact that the bottom surface of the positioning block cannot be in tight contact with the lance body and there is a gap, it will inevitably cause the positioning block to burn out. Moreover, during each lifting process of the oxygen lance, as Figure 1 shown in area b, due to the offset of the lance body, it will occasionally be scratched by the edge under the round hole of the nitrogen seal seat. Each scratch will cause a violent impact, resulting in the gradual tearing of the weld of the positioning block until the positioning block falls off. After the positioning block burns out or falls off, the nitrogen seal ring cannot ensure its height position on the lance body, causing the oxygen lance to be unable to be used normally. Content of the Utility Model

[0005] The purpose of the utility model is to provide an embedded positioning block device with double guiding and internal cooling functions, which has double guiding and internal cooling functions, and solves the problems of melting, burning out of the positioning block in the high-temperature environment and scratching with the nitrogen seal seat in the prior art.

[0006] To achieve the above object, the technical solution adopted by the present utility model is that the present utility model provides an embedded positioning block device with double guiding and internal cooling functions, including a nitrogen sealing seat, through which an oxygen lance pipe passes. A nitrogen sealing ring is arranged at the rear side of the oxygen lance pipe. The oxygen lance pipe includes a water inlet pipe cavity, a water return pipe cavity and an oxygen pipe cavity. A water-cooled positioning block is arranged on the outer wall of the upper part of the oxygen lance pipe. A groove is arranged on the outer wall of the oxygen lance pipe. The periphery of the bottom of the water-cooled positioning block is processed into a chamfer. A through hole is arranged on the water-cooled positioning block, and the end of the through hole is connected to a through cavity.

[0007] The water inlet pipe cavity, the water return pipe cavity and the oxygen pipe cavity are arranged layer by layer. The water inlet pipe cavity is annularly arranged on the outermost layer, the water return pipe cavity is annularly arranged in the middle layer, and the oxygen pipe cavity is arranged in the innermost layer.

[0008] Preferably, the groove is rectangular, and 3-4 grooves are arranged in the circumferential direction of the outer wall of the oxygen lance pipe.

[0009] Preferably, two openings are processed at both ends of the bottom of the groove along the axial direction.

[0010] Preferably, the number of the water-cooled positioning blocks corresponds to the number of the grooves, the position of the through hole corresponds to the position of the opening, and the connection between the through hole and the through cavity is in an n shape.

[0011] Preferably, the grooves are evenly distributed on the circumference of the outer wall of the oxygen lance pipe. The depth of the groove is 30% of the wall thickness of the oxygen lance pipe. The side length dimensions of each side of the groove are 0.5 mm longer than those of the water-cooled positioning block for convenient installation. Chamfers of ∠5×45° are processed on the four sides of the groove.

[0012] Preferably, the opening is Φ8.5 mm, and is processed at a position 10 mm away from both ends of the groove with the center line of the groove as the reference.

[0013] Preferably, the water-cooled positioning block is processed from a steel plate with a thickness of 30 mm into a blank of 100×30×80 mm. The bottom edge dimension of the water-cooled positioning block is 0.5 mm smaller than the groove dimension. Chamfers of ∠25×60° are processed at both ends of the water-cooled positioning block.

[0014] Preferably, on the bottom surface of the water-cooled positioning block, with the longitudinal center line of the water-cooled positioning block as the reference, through holes with a diameter of Φ10 mm and a depth of 50 mm are processed at positions 10 mm away from both ends of the bottom surface. Through cavities with a diameter of Φ8.5 mm are processed at the center line positions 50 mm away from the bottom surface on both end faces of the water-cooled positioning block. The through cavities penetrate and connect the two through holes.

[0015] Preferably, M10 screw holes are added at both ends of the through cavity, the depth of the screw holes is 15-20 mm, and M10 countersunk bolts and sealant are used to seal both ends of the through cavity.

[0016] Preferably, the water-cooled positioning block is placed into the groove and fillet welded using E4303 electrode with a fillet weld height of 10 mm.

[0017] Compared with the prior art, the advantages and positive effects of the present utility model are as follows:

[0018] 1. The present utility model makes up for the deficiencies existing in the prior art during use, effectively solves the problems of melting and burning loss in high-temperature environments, ensures the correct position of the nitrogen sealing ring when the oxygen lance is lifted, guarantees the normal lifting and lowering of the oxygen lance, and effectively solves the problem of the impact and detachment of the positioning block caused by the inner hole edges and corners below the round hole of the nitrogen sealing seat;

[0019] 2. The design and processing of the embedded groove of the present utility model enable the positioning block to be stably fixed on the outer wall of the oxygen lance water inlet cavity. The bottom plane of the positioning block fits tightly with the bottom plane of the groove, increasing the heat conduction rate of the positioning block;

[0020] 3. The water-cooling function designed for the positioning block of the present utility model enables the positioning block to be normally used in the high-temperature environment inside the furnace, ensuring the stable position of the nitrogen sealing ring on the oxygen lance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 is a structural schematic diagram of the existing oxygen lance nitrogen seal ring positioning block;

[0023] Figure 2 is an enlarged view of area a of the existing oxygen lance nitrogen seal ring positioning block;

[0024] Figure 3 is a side sectional view of area a of the existing oxygen lance nitrogen seal ring positioning block;

[0025] Figure 4 is a structural schematic diagram of an embedded positioning block device with double guiding and internal cooling functions;

[0026] Figure 5 is an enlarged view of area c of an embedded positioning block device with double guiding and internal cooling functions;

[0027] Figure 6 is a side sectional view of area c of an embedded positioning block device with double guiding and internal cooling functions;

[0028] In the above figures, 1 is the oxygen lance pipe, 2 is the water inlet pipe cavity, 3 is the existing positioning block, 4 is the nitrogen seal seat, 5 is the nitrogen seal ring, 6 is the water return pipe cavity, 7 is the oxygen pipe cavity, 8 is the water-cooled positioning block, 9 is the groove, 10 is the through hole, 11 is the chamfer, and 12 is the through cavity. Detailed implementation mode

[0029] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention will be further described below with reference to the drawings and embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0030] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the present invention is not limited by the specific embodiments disclosed in the following specification.

[0031] Embodiment 1, an embedded water-cooled positioning block device with double guiding and internal cooling functions, as Figures 4-6 shown, includes a nitrogen seal seat 4. The oxygen lance pipe 1 passes through the nitrogen seal seat 4. A nitrogen seal ring 5 is arranged at the rear side of the oxygen lance pipe 1. The nitrogen seal ring 5 is responsible for protecting and sealing the contact between the oxygen lance and the high-temperature environment in the furnace, preventing the influence of molten metal or high-temperature gas flow, effectively preventing the interference between the substances in the furnace and the outside, and improving the working efficiency of the oxygen lance. The nitrogen seal seat 4 is used to cooperate with the nitrogen seal ring 5 to ensure the stability and position retention of the oxygen lance during the process of lifting the lance, improve the safety and stability of the operation, provide reliable support, and prevent accidental deviation of the oxygen lance during the operation.

[0032] The oxygen lance pipe 1 includes a water inlet pipe cavity 2, a water return pipe cavity 6 and an oxygen pipe cavity 7. The oxygen lance pipe 1 is the main channel for introducing oxygen into the converter, and is also responsible for the flow of cooling water, realizing the effective transmission of different media. Through the layered design, the flow of various media can be effectively managed and regulated, improving the overall cooling effect and the stability of oxygen supply. The water inlet pipe cavity 2 is responsible for transporting the cooling water to the oxygen lance pipe 1, reducing the temperature of the components in the high-temperature environment. Through the timely water cooling mechanism, the service life of the oxygen lance and the water-cooled positioning block 8 is extended, and the risk of burnout is reduced. The water return pipe cavity 6 returns the used water from the oxygen lance pipe 1 for reuse or discharge, improving the overall efficiency, reducing water resource waste and protecting the environment. The oxygen pipe cavity 7 is specifically used for transporting oxygen to ensure that oxygen can be effectively blown into the furnace at the required position.

[0033] The outer wall of the oxygen lance pipe 1 is provided with a water-cooled positioning block 8. The water-cooled positioning block 8 can conduct heat in time through the internal water-cooled channel, and at the same time maintain the stability of the water-cooled positioning block 8 at high temperature, improve the thermal deformation resistance of the water-cooled positioning block 8, reduce the risk of burning damage, and effectively improve the heat conduction rate. The outer wall of the oxygen lance pipe 1 is provided with a groove 9. The groove 9 provides an embedding position for the water-cooled positioning block 8, which helps to fix and stabilize the water-cooled positioning block 8. Through excellent fitting, the heat conduction efficiency of the water-cooled positioning block 8 is improved, and movement and falling off in a high-temperature environment are prevented. The periphery of the bottom of the water-cooled positioning block 8 is processed into a chamfer 11. The chamfer 11 is easy to assemble and reduces the corner stress, prevents cracks from occurring under high-temperature conditions, and enhances the durability and structural integrity of the component. A through hole 10 is provided on the water-cooled positioning block 8. The through hole 10 provides an inlet and an outlet for the cooling water to flow through the water-cooled positioning block 8 to adjust the temperature. The end of the through hole 10 is connected to a through cavity 12. The through hole 10 and the through cavity 12 are connected to form a water path to achieve the cooling function.

[0034] The water inlet pipe cavity 2, the water return pipe cavity 6 and the oxygen pipe cavity 7 are arranged layer by layer. The water inlet pipe cavity 2 is annularly arranged on the outermost layer, the water return pipe cavity 6 is annularly arranged in the middle layer, and the oxygen pipe cavity 7 is arranged in the innermost layer. The water inlet pipe cavity 2 is located on the outermost layer. The water inlet pipe cavity 2 can evenly cool the entire oxygen lance, ensuring that the oxygen lance is fully cooled in a high-temperature working environment. The cooling water can contact the gun body with a large surface area, improving the cooling efficiency and reducing the possible local overheating phenomenon. The water return pipe is located in the middle layer and is responsible for collecting and returning the used cooling water, effectively returning the cooling water to the water storage system or recycling it. The oxygen pipe cavity 7 is arranged in the innermost layer and is responsible for transporting oxygen from the oxygen source to the converter for smelting operations. The position of the inner layer ensures the directness and effectiveness of the oxygen supply. Being built inside other pipe cavities can reduce the possibility of the oxygen pipeline being affected by the external high temperature, ensuring the purity and pressure stability of the oxygen.

[0035] The following specifically describes the specific designs of the above key components:

[0036] The groove 9 is rectangular, and 3-4 are arranged in the circumferential direction of the outer pipe wall of the oxygen lance pipe 1. Two openings are processed at both ends of the bottom of the groove 9 along the axial direction. The rectangular groove 9 can make the water-cooled positioning block 8 evenly stressed in all directions to reduce the risk brought by stress concentration. The openings correspond to the through holes 10 of the water-cooled positioning block 8 to form a communication relationship to ensure the flow of the cooling water.

[0037] The number of the water-cooled positioning blocks 8 is set corresponding to the number of the grooves 9, and the positions of the through holes 10 are set corresponding to the positions of the openings. The through holes 10 and the through cavities 12 are connected in an "n" shape to form a communication relationship, facilitating the flow of cooling water led out from the oxygen lance pipeline 1 for temperature reduction. The through through holes 10 and the openings can introduce the rapidly flowing oxygen lance water into the interior of the water-cooled positioning blocks 8, and can timely take away the heat absorbed by the water-cooled positioning blocks 8, stabilizing the temperature of the water-cooled positioning blocks 8 below 300 °C, ensuring that the mechanical properties of the metal material can still be guaranteed under the scouring of the high-temperature gas flow in the furnace, avoiding the phenomenon of high-temperature burning damage of the water-cooled positioning blocks 8, and solving the burning damage problem caused by low heat conduction rate.

[0038] The grooves 9 are evenly distributed on the circumferential outer wall of the oxygen lance pipeline 1. The depth of the grooves 9 is 30% of the wall thickness of the oxygen lance pipeline 1. The side lengths of each side of the grooves 9 are 0.5 mm longer than those of the water-cooled positioning blocks 8 for convenient installation, and chamfers of ∠5×45° are machined on the four sides of the grooves 9. The edges around the grooves 9 can have a constraining effect on the axial displacement generated by the water-cooled positioning blocks 8, enabling the water-cooled positioning blocks 8 to be stably fixed on the outer wall of the oxygen lance pipeline 1, increasing the axial resistance of the water-cooled positioning blocks 8, and ensuring the correct position of the water-cooled positioning blocks 8 on the lance body;

[0039] The wall thickness remaining at the bottom of the grooves 9 becomes thinner, which can not only improve the heat conduction rate of the pipe wall, but also enhance the anti-tearing ability of the lance body under impact load, avoid the phenomenon of ultra-high temperature of the water-cooled positioning blocks 8, and prevent sudden accidents of the lance body suddenly tearing and leaking water.

[0040] The openings are Φ8.5 mm, and are machined at positions 10 mm away from both ends of the grooves 9 with the center line of the grooves 9 as the reference. The size and position of the openings correspond to the size and position of the through holes 10.

[0041] The water-cooled positioning blocks 8 are processed from a billet of 100×30×80 mm using a steel plate with a thickness of 30 mm. The bottom side dimension of the water-cooled positioning blocks 8 is 0.5 mm smaller than the dimension of the grooves 9, and chamfers of ∠25×60° are machined at both ends of the water-cooled positioning blocks 8. After adding a guiding structure with chamfers 11 on one side of the water-cooled positioning blocks 8 close to the nitrogen sealing ring 5 at the top, when the two edges meet, the chamfer 11 structure can correctly guide the rising trajectory of the oxygen lance, avoiding the rubbing problem of the water-cooled positioning blocks 8 against the inner hole edges under the nitrogen sealing seat 4.

[0042] On the bottom surface of the water-cooled positioning blocks 8, through holes 10 with a diameter of Φ10 mm and a depth of 50 mm are machined at positions 10 mm away from both ends of the bottom surface with the longitudinal center line of the water-cooled positioning blocks 8 as the reference. On the end faces of the water-cooled positioning blocks 8 at the center line position 50 mm away from the bottom surface, through cavities 12 with a diameter of Φ8.5 mm are machined, and the through cavities 12 penetrate and connect the two through holes 10.

[0043] The bottom plane of the water-cooled positioning block 8 fits closely with the bottom plane of the groove 9, which increases the heat conduction rate of the water-cooled positioning block 8. Coupled with the through holes 10 designed in the water-cooled positioning block 8, the flowing oxygen lance cooling water will timely absorb and conduct the heat, solving the problem of high-temperature burnout of the water-cooled positioning block 8 and ensuring that the water-cooled positioning block 8 remains in good condition in the high-temperature environment inside the furnace for a long time.

[0044] M10 screw holes are added at both ends of the through cavity 12, and the depth of the screw holes is 15 - 20 mm. The two ends of the through cavity 12 are sealed with M10 countersunk bolts and sealant. The water-cooled positioning block 8 is placed into the groove 9 and fillet welded using E4303 welding rods, with a weld leg height of 10 mm. The oxygen lance after welding and sealing needs to be subjected to a hydrostatic test. The test pressure is 1.6 MPa, the pressure holding time is 30 min, and the pressure drop is not greater than 0.1 MPa. Check that the weld joints of the water-cooled positioning block 8 and the plug heads of the countersunk bolts do not leak water.

[0045] The standard parts used in the present utility model can all be purchased from the market. The special-shaped parts can be customized according to the descriptions in the specification and the drawings. The specific connection methods of each part all adopt conventional means such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts, and equipment all adopt conventional models in the prior art, and will not be elaborated here. The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0046] The above are only the preferred embodiments of the present utility model, and do not limit the present utility model in other forms. Any person skilled in the art may use the technical content disclosed above to make changes or modifications into equivalent embodiments with equivalent changes and apply them to other fields. However, as long as it does not depart from the technical solution content of the present utility model, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present utility model still fall within the protection scope of the technical solution of the present utility model.

Claims

1. An embedded positioning block device with dual guiding and internal cooling functions, comprising a nitrogen sealing seat through which an oxygen lance pipe passes. A nitrogen sealing ring is arranged at the rear side of the oxygen lance pipe. It is characterized in that, The oxygen lance pipe includes a water inlet pipe cavity, a water return pipe cavity, and an oxygen pipe cavity. The outer wall of the oxygen lance pipe is provided with water-cooled positioning blocks. The outer wall of the oxygen lance pipe is provided with grooves. The bottom periphery of the water-cooled positioning blocks is processed into a chamfer. The water-cooled positioning blocks are provided with through holes, and the ends of the through holes are connected to a through cavity; The water inlet pipe cavity, the water return pipe cavity, and the oxygen pipe cavity are arranged layer by layer. The water inlet pipe cavity is annularly arranged on the outermost layer, the water return pipe cavity is annularly arranged in the middle layer, and the oxygen pipe cavity is arranged in the innermost layer.

2. The embedded positioning block device with dual guiding and internal cooling functions according to claim 1, characterized in that, The grooves are rectangular, and 3 - 4 grooves are arranged in the circumferential direction of the outer wall of the oxygen lance pipe.

3. An embedded positioning block device with dual guiding and internal cooling functions according to claim 2, characterized in that, Two openings are processed at both ends of the bottom of the groove along the axial direction.

4. An embedded positioning block device with dual guiding and internal cooling functions according to claim 3, characterized in that, The number of the water-cooled positioning blocks corresponds to the number of the grooves, the positions of the through holes correspond to the positions of the openings, and the through holes are connected to the through cavity in an 'n' shape.

5. An embedded positioning block device with double guiding and internal cooling functions according to claim 2, characterized in that, The grooves are evenly distributed on the circumferential surface of the outer wall of the oxygen lance pipe. The depth of the grooves is 30% of the wall thickness of the oxygen lance pipe. The side lengths of each groove are 0.5 mm longer than those of the water-cooled positioning blocks for convenient installation, and the four sides of the grooves are processed into ∠5×45° chamfers.

6. An embedded positioning block device with double guiding and internal cooling functions according to claim 3, characterized in that, The openings are Φ8.5 mm, and are processed at positions 10 mm away from both ends of the groove with the center line of the groove as the reference.

7. An embedded positioning block device with dual guiding and internal cooling functions according to claim 4, characterized in that, The water-cooled positioning blocks are processed from a blank of 100×30×80 mm made of a steel plate with a thickness of 30 mm. The bottom side dimension of the water-cooled positioning blocks is 0.5 mm smaller than the groove dimension, and the two ends of the water-cooled positioning blocks are processed into ∠25×60° chamfers.

8. An embedded positioning block device with dual guiding and internal cooling functions according to claim 7, characterized in that, On the bottom surface of the water-cooled positioning blocks, with the longitudinal center line of the water-cooled positioning blocks as the reference, through holes with a diameter of Φ10 mm and a depth of 50 mm are processed at positions 10 mm away from both ends of the bottom surface. On the end faces of the water-cooled positioning blocks, at the center line positions 50 mm away from the bottom surface, through cavities with a diameter of Φ8.5 mm are processed, and the through cavities connect the two through holes.

9. The embedded positioning block device with dual guiding and internal cooling functions according to claim 8, characterized in that, M10 screw holes are added at both ends of the through cavity, with a screw hole depth of 15 - 20 mm. The two ends of the through cavity are sealed with M10 countersunk bolts and sealant.

10. An embedded positioning block device with dual guiding and internal cooling functions according to claim 1, characterized in that, The water-cooled positioning blocks are placed into the grooves, and fillet welding is carried out using E4303 electrodes, with a fillet weld height of 10 mm.

Images