High performance kr stirrer

Abstract

The utility model relates to the technical field of stirrers, and discloses a high-performance KR stirrer, which comprises a mounting rack, a motor rack fixedly installed on the mounting rack and a driving motor fixedly installed on the motor rack. The high-performance KR stirrer is provided with a stirring assembly. When the driving motor on the motor rack is started, the output shaft drives the rotating shaft and the cross-shaped V-shaped shaft to rotate synchronously. The conical blade makes the circular blade and the cross-shaped blade more firmly connected. The V-shaped structure of the groove and the cross-shaped V-shaped shaft, the bottom shaft and the bottom disc make the cross-shaped V-shaped shaft and the cross-shaped blade more tightly connected. The stress transmission is further reduced to reduce the damage to the refractory castable. The slope better guides the high-temperature molten iron, so that the stirring is better. The transition bonding layer, the main thermal shock resistance layer and the surface erosion resistance layer can improve the thermal shock stability and the erosion resistance of the external working lining.

Description

Technical Field

[0001] This utility model relates to the field of agitator technology, specifically a high-performance KR agitator. Background Technology

[0002] In the iron and steel metallurgy industry, the KR stirring desulfurization process has become one of the core technologies in the hot metal pretreatment process due to its significant advantages such as high desulfurization efficiency, low desulfurizing agent consumption, short operation time, low metal loss and low refractory material consumption. As a key component of the KR desulfurization unit, the structural design and material properties of the stirrer have an important impact on the operating cost and production efficiency of the entire KR desulfurization process.

[0003] Currently, most KR agitators on the market are manufactured using the traditional method of "refractory castable covering steel structure." This method has certain drawbacks in practical applications. The overall structure is simple, and the bond between the refractory castable and the steel structure is not tight enough. When the agitator comes into contact with high-temperature molten iron, the temperature difference between the inner and outer layers of the refractory material is significant, resulting in a large stress difference between the layers. This easily leads to the generation and propagation of microcracks inside the casting. On the other hand, the intermittent operation mode of the KR desulfurization process (the agitator needs to be removed from the high-temperature molten iron after each operation and cooled in room temperature air, and then reinserted into the high-temperature molten iron operation when the next batch of molten iron is ready) causes the refractory castable of the agitator to frequently experience rapid heating and cooling cycles of "high temperature-room temperature-high temperature," further aggravating the stress difference between the inner and outer layers. Under long-term action, microcracks propagate faster and new cracks are generated, eventually leading to the spalling of the refractory castable. This not only gradually reduces the thickness of the refractory castable but also significantly shortens the service life of the agitator.

[0004] In view of this, we propose a high-performance KR stirrer. Utility Model Content

[0005] The purpose of this invention is to provide a high-performance KR stirrer to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A high-performance KR stirrer includes a mounting frame, on which a motor frame is fixedly mounted. A drive motor is fixedly mounted on the motor frame, and an output shaft is fixedly mounted on the output end of the drive motor. The output shaft is rotatably mounted inside the motor frame via bearing components. A stirring assembly is disposed on the output shaft, and the stirring assembly includes: A rotating shaft is fixedly installed at the end of the output shaft away from the drive motor. A cross-shaped V-shaped shaft is fixedly installed at the lower end of the rotating shaft. The cross-shaped V-shaped shaft has grooves, and multiple sets of grooves are provided. The rotating shaft and the cross-shaped V-shaped shaft are integrally cast with an external working liner. The external working liner consists of circular blades, conical blades, and cross-shaped blades from top to bottom. The cross-shaped blades have inclined surfaces on their outer surfaces. The bottom shaft is fixedly installed inside the cross-shaped V-shaped shaft, and the chassis is fixedly installed on the bottom shaft.

[0007] In a further embodiment, the rotating shaft and the cross-shaped V-shaped shaft are integrally cast from steel, and the outer working lining is made of refractory castable, thereby improving the service life of the KR agitator.

[0008] In a further embodiment, the refractory castable consists of a transition bonding layer, a main thermal shock resistant layer, and a surface anti-corrosion layer from the inside out. The transition bonding layer is adjacent to the outer surface of the steel structure, and the surface anti-corrosion layer is in contact with the high-temperature molten iron and desulfurizing agent inside the desulfurization device, which can improve the thermal shock stability and corrosion resistance of the external working lining.

[0009] In a further embodiment, the circular and conical blades are wrapped around the outside of the rotating shaft, and the cross-shaped blades are wrapped around the cross-shaped V-shaped shaft, the bottom shaft, and the outside of the chassis.

[0010] In a further embodiment, the mounting frame is equipped with an auxiliary component, which includes a hot air pump. The hot air pump is fixedly mounted on the mounting frame. A circular sleeve is rotatably fitted around the outside of the rotating shaft. The output end of the hot air pump and the circular sleeve are fixedly connected through an air outlet pipe. Sealing rings are fixedly installed at both the upper and lower ends of the circular sleeve. A side hole is opened on the arc-shaped sidewall at the top of the rotating shaft. A vertical groove is opened at the center of the rotating shaft. A V-shaped groove is opened inside the cross-shaped V-shaft. The air outlet pipe, the circular sleeve, the side hole, the vertical groove, and the V-shaped groove are interconnected, which better avoids rapid cooling and heating during intermittent operation, which could cause cracks or spalling of the refractory castable, thereby better protecting the mixer body.

[0011] In a further embodiment, multiple side holes are equidistantly spaced around the circumference, and multiple V-grooves are equidistantly spaced around the circumference.

[0012] In a further embodiment, the input end of the hot gas pump is connected to the output end of the heating equipment, and the mounting bracket is fixedly installed on the lifting structure of the target desulfurization device.

[0013] Compared with the prior art, this utility model provides a high-performance KR stirrer with the following advantages: 1. This high-performance KR agitator, in order to better perform mixing and extend its service life, is equipped with a mixing component. The agitator body is mounted on the lifting structure of the target desulfurization unit using a mounting frame. When the drive motor on the motor frame is started, the output shaft drives the rotating shaft and the cross-shaped V-shaft to rotate synchronously. An external working lining made of refractory castable is integrally cast outside the rotating shaft and the cross-shaped V-shaft. The conical blades ensure a stronger bond between the circular and cross-shaped blades. The V-shaped structure of the groove and the cross-shaped V-shaft, along with the bottom shaft and chassis, further tightens the connection between the cross-shaped V-shaft and the cross-shaped blades, forming a "mechanical interlocking" structure. This effectively reduces the relative displacement between the refractory castable and the steel structure due to the difference in thermal expansion coefficients, further reducing stress transmission damage to the refractory castable. The inclined surface better guides the flow of high-temperature molten iron, thus enabling better mixing. The transition bonding layer, main thermal shock resistant layer, and surface anti-corrosion layer improve the thermal shock stability and corrosion resistance of the external working lining.

[0014] 2. To better protect the agitator body, this high-performance KR agitator is equipped with auxiliary components. When the agitator moves upward away from the high-temperature molten iron, the hot air pump is activated, allowing hot air to enter the side holes, vertical grooves, and V-shaped grooves sequentially through the air outlet pipe and the annular sleeve. This, combined with the sealing ring, improves the sealing performance and reduces the temperature difference between the inside and outside of the steel structure. This better avoids rapid heating and cooling during intermittent operation, which could cause cracks or spalling in the refractory castable, thus better protecting the agitator body. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the overall structure of the present invention from another perspective; Figure 3 This is a schematic cross-sectional view of part of the structure of this utility model; Figure 4 This is a cross-sectional schematic diagram of a portion of the stirring assembly of this utility model; Figure 5 This utility model Figure 4 Enlarged structural diagram of region A in the middle; Figure 6 This is an exploded cross-sectional view of part of the structure of this utility model; Figure 7 This is a cross-sectional view of part of the structure of this utility model; Figure 8 This is a cross-sectional view of the cross-shaped blade of this utility model; Figure 9 This is a cross-sectional view of part of the stirring assembly of this utility model.

[0016] Explanation of icon numbers: 1. Mounting bracket; 2. Motor bracket; 3. Drive motor; 4. Output shaft; 5. Stirring assembly; 51. Rotating shaft; 52. Cross-shaped V-shaped shaft; 53. Groove; 54. Circular blade; 55. Conical blade; 56. Cross-shaped blade; 57. Inclined surface; 58. Bottom shaft; 59. Chassis; 510. Transition bonding layer; 511. Main thermal shock resistant layer; 512. Surface anti-corrosion layer; 6. Auxiliary components; 61. Heat pump; 62. Air outlet pipe; 63. Circular ring sleeve; 64. Sealing ring; 65. Side hole; 66. Vertical groove; 67. V-groove. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] In this application, the term "above" indicates the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. It is primarily used to better describe this application and its embodiments, and is not intended to limit the indicated device, element, or component to having a specific orientation, or to construct and operate in a specific orientation. Furthermore, the term "above" may also be used in certain circumstances to indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances.

[0019] Please see Figures 1-9 This utility model provides a technical solution: A high-performance KR mixer includes a mounting frame 1, a motor frame 2 fixedly mounted on the mounting frame 1, a drive motor 3 fixedly mounted on the motor frame 2, an output shaft 4 fixedly mounted on the output end of the drive motor 3, and the output shaft 4 being rotatably mounted inside the motor frame 2 via bearing components.

[0020] First, the entire agitator body is installed on the lifting structure of the target desulfurization unit using mounting bracket 1, providing basic support for the agitation operation.

[0021] In one embodiment of this utility model, a stirring assembly 5 is provided on the output shaft 4. The stirring assembly 5 includes a rotating shaft 51, which is fixedly mounted on the output shaft 4. A cross-shaped V-shaped shaft 52 is fixedly mounted on the rotating shaft 51. In addition, the rotating shaft 51 and the cross-shaped V-shaped shaft 52 are integrally cast from steel, and the outer working lining is made of refractory castable to improve the service life of the KR stirrer. The cross-shaped V-shaped shaft 52 has four sets of grooves 53. The rotating shaft 51 and the cross-shaped V-shaped shaft 52 are integrally cast with an outer working lining. The outer working lining consists of circular blades 54, conical blades 55, and cross-shaped blades 56 from top to bottom. In addition, circular blades 54 and conical blades 55 cover the outside of rotating shaft 51, and cross-shaped blades 56 are provided with inclined surfaces 57. The bottom shaft 58 is fixedly installed inside the cross-shaped V-shaft 52, and a base 59 is fixedly installed on the bottom shaft 58. The cross-shaped blades 56 cover the cross-shaped V-shaft 52, the bottom shaft 58 and the base 59. In addition, the refractory castable consists of a transition bonding layer 510, a main thermal shock resistant layer 511 and a surface anti-corrosion layer 512 from the inside to the outside. The transition bonding layer 510 is close to the outer surface of the steel structure, and the surface anti-corrosion layer 512 is in contact with the high-temperature molten iron and desulfurizing agent inside the desulfurization device, which can improve the thermal shock stability and corrosion resistance of the external working lining.

[0022] In this embodiment, when stirring is required, the drive motor 3 mounted on the motor frame 2 is started. The drive motor 3 generates power, which is transmitted to the stirring assembly 5 through the output shaft 4, causing the rotating shaft 51 and the cross-shaped V-shaft 52 to rotate synchronously. The rotating shaft 51 and the cross-shaped V-shaft 52 are integrally cast from steel, ensuring the overall strength of the structure. An outer working lining made of refractory castable is integrally cast on their exterior. This outer working lining forms, from top to bottom, circular blades 54, conical blades 55, and cross-shaped blades 56. The circular blades 54 and conical blades 55 cover the exterior of the rotating shaft 51, while the cross-shaped blades 56 cover the exterior of the cross-shaped V-shaft 52, the bottom shaft 58, and the base 59. The presence of the conical blades 55 makes the connection between the circular blades 54 and the cross-shaped blades 56 more secure, improving the stability of the overall structure. The cross-shaped V-shaft 52 has grooves 53, which, combined with its V-shaped structure, further... With the cooperation of the bottom shaft 58 and the chassis 59, a tight "mechanical interlocking" structure is formed between the cross-shaped V-shaft 52 and the cross-shaped blade 56. This structure can effectively reduce the relative displacement between the refractory castable and the steel structure due to the difference in thermal expansion coefficients, thereby reducing the damage to the refractory castable caused by stress transmission and extending its service life. The inclined surface 57 set on the outside of the cross-shaped blade 56 can better guide the flow of high-temperature molten iron, making the flow of molten iron more reasonable during the stirring process, thereby improving the stirring efficiency and effect. The refractory castable is divided into a transition bonding layer 510, a main thermal shock resistant layer 511, and a surface anti-corrosion layer 512 from the inside to the outside. The transition bonding layer 510 is close to the outer surface of the steel structure, the main thermal shock resistant layer 511 is located in the middle, and the surface anti-corrosion layer 512 is on the outermost side, directly contacting the high-temperature molten iron and desulfurizing agent inside the desulfurization device. These three layers work together to significantly improve the thermal shock stability and corrosion resistance of the external working lining, further ensuring the service life of the KR agitator.

[0023] In one embodiment of this utility model, an auxiliary component 6 is provided on the mounting frame 1. The auxiliary component 6 includes a hot air pump 61, which is fixedly mounted on the mounting frame 1. A circular ring sleeve 63 is rotatably fitted around the outside of the rotating shaft 51. An air outlet pipe 62 is fixedly connected between the output end of the hot air pump 61 and the circular ring sleeve 63. Sealing rings 64 are fixedly installed at both the upper and lower ends of the circular ring sleeve 63. A side hole 65 is opened on the arc-shaped sidewall at the top of the rotating shaft 51, and a vertical groove 66 is opened at the center of the rotating shaft 51. The shaft 52 has a V-shaped groove 67 inside. The air outlet pipe 62, the annular sleeve 63, the side hole 65, the vertical groove 66 and the V-shaped groove 67 are connected to each other to better avoid rapid cooling and heating under intermittent operation, which may cause cracks or spalling of the refractory castable, thus better protecting the agitator body. In addition, there are multiple sets of side holes 65 and four sets of V-shaped grooves 67. In addition, the input end of the hot air pump 61 is connected to the output end of the heating equipment, and the mounting bracket 1 is fixedly installed on the lifting structure of the target desulfurization device.

[0024] In this embodiment, when the stirrer completes its stirring operation and moves upward away from the high-temperature molten iron, the auxiliary component 6 begins to function, activating the hot air pump 61. The input end of the hot air pump 61 is connected to the output end of the heating equipment, introducing hot air. The hot air is then transported through the air outlet pipe 62 to the annular sleeve 63, and then sequentially enters the multiple sets of side holes 65 opened on the arc-shaped sidewall at the top of the rotating shaft 51, the vertical groove 66 in the center of the rotating shaft 51, and the four sets of V-shaped grooves 67 opened inside the cross-shaped V-shaped shaft 52. The sealing rings 64 installed at the upper and lower ends of the annular sleeve 63 enhance the sealing of the entire air passage. This design reduces heat leakage and significantly decreases the temperature difference between the inside and outside of the steel structure. This effectively prevents cracking or spalling of the refractory castable due to rapid heating and cooling during intermittent operation, thus better protecting the mixer body and ensuring its long-term stable operation. It is worth noting that the vent pipe 62 is equipped with an extraction pipe and valves to extract the gas inside the rotating shaft 51 and the cross-shaped V-shaped shaft 52 during the next operation of the mixer. This is an existing structure and technology, so it is not shown in the figure. The gas is introduced in a quantitative manner, which will not be described in detail here.

[0025] All electrical components mentioned in this application are electrically connected to the controller and 220V AC mains power. The controller is a conventional and known device that can control the drive motor 3, the heat pump 61, and the heating equipment. All standard parts used in this application can be purchased from the market. The specific connection methods of each part are all conventional methods such as riveting and welding that are mature in the prior art. The standard parts are all conventional models in the prior art. In addition, the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here.

[0026] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. A high-performance KR stirrer, comprising a mounting frame (1), a motor frame (2) fixedly mounted on the mounting frame (1), a drive motor (3) fixedly mounted on the motor frame (2), an output shaft (4) fixedly mounted on the output end of the drive motor (3), the output shaft (4) being rotatably mounted inside the motor frame (2) via bearing components, characterized in that: A stirring assembly (5) is provided on the output shaft (4), and the stirring assembly (5) includes: A rotating shaft (51) is fixedly installed at one end of the output shaft (4) away from the drive motor (3). A cross-shaped V-shaped shaft (52) is fixedly installed at the lower end of the rotating shaft (51). A groove (53) is provided on the cross-shaped V-shaped shaft (52). Multiple sets of grooves (53) are provided. An external working liner is integrally cast on the outside of the rotating shaft (51) and the cross-shaped V-shaped shaft (52). The external working liner consists of a circular blade (54), a conical blade (55), and a cross-shaped blade (56) from top to bottom. An inclined surface (57) is provided on the outside of the cross-shaped blade (56). The bottom shaft (58) is fixedly installed inside the cross-shaped V-shaped shaft (52), and the chassis (59) is fixedly installed on the bottom shaft (58).

2. The high performance KR agitator of claim 1, wherein: The rotating shaft (51) and the cross-shaped V-shaped shaft (52) are integrally cast steel structures, and the outer working lining is made of refractory castable.

3. The high performance KR agitator of claim 2, wherein: The refractory castable consists of a transition bonding layer (510), a main thermal shock resistant layer (511), and a surface anti-corrosion layer (512) from the inside out. The transition bonding layer (510) is adjacent to the outer surface of the steel structure, and the surface anti-corrosion layer (512) is in external contact with the high-temperature molten iron and desulfurizing agent inside the desulfurization device.

4. The high performance KR agitator of claim 3, wherein: The circular blade (54) and the conical blade (55) are covered outside the rotating shaft (51), and the cross-shaped blade (56) is covered on the cross-shaped V-shaped shaft (52), the bottom shaft (58) and the outside of the chassis (59).

5. The high performance KR agitator of claim 1, wherein: An auxiliary component (6) is provided on the mounting frame (1). The auxiliary component (6) includes a hot air pump (61). The hot air pump (61) is fixedly installed on the mounting frame (1). A circular ring sleeve (63) is rotatably fitted to the outside of the rotating shaft (51). The output end of the hot air pump (61) and the circular ring sleeve (63) are fixedly connected through an air outlet pipe (62). Sealing rings (64) are fixedly installed at both the upper and lower ends of the circular ring sleeve (63). A side hole (65) is opened on the arc-shaped side wall at the top of the rotating shaft (51). A vertical groove (66) is opened in the center of the rotating shaft (51). A V-groove (67) is opened inside the cross-shaped V-shaft (52). The air outlet pipe (62), the circular ring sleeve (63), the side hole (65), the vertical groove (66), and the V-groove (67) are interconnected.

6. The high performance KR agitator of claim 5, wherein: The side holes (65) are provided in multiple circumferentially spaced portions, and the V-shaped grooves (67) are provided in multiple circumferentially spaced portions.

7. The high performance KR agitator of claim 6, wherein: The input end of the hot air pump (61) is connected to the output end of the heating equipment, and the mounting bracket (1) is fixedly installed on the lifting structure of the target desulfurization device.

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