阅读说明：本技术 一种连铸多孔塞棒及连铸系统 (Continuous casting porous stopper rod and continuous casting system ) 是由 黄忠 闫绍祥 于晓英 邓龙辉 于召浩 于 2021-07-20 设计创作，主要内容包括：本发明涉及一种本发明的连铸多孔塞棒,包括棒体和连接所述棒体的棒头,还包括设置在所述棒体内部的吹气通道,用于输送保护气,设置在所述棒头上、连接所述吹气通道的吹气支路,用于将吹气通道输送来的保护气分配到各个方向；所述吹气支路至少设置两条,至少两条所述吹气支路的出气方向具有沿塞棒周向的分量。由于多个吹气支路的出气方向具有沿塞棒周向的分量,多个吹气支路朝向同一个周向的方向,从而在棒头周围形成围绕棒头旋转的气泡,带动周围的钢水旋转,可以更好的清扫水口内部附着物。(The invention relates to a continuous casting porous stopper rod, which comprises a rod body, a rod head connected with the rod body, a blowing channel arranged in the rod body and used for conveying shielding gas, and a blowing branch arranged on the rod head and connected with the blowing channel and used for distributing the shielding gas conveyed by the blowing channel to all directions; the blowing branch is at least two, and the air outlet direction of the at least two blowing branches has a component along the circumferential direction of the stopper rod. Because the air outlet direction of the plurality of air blowing branches has a component along the circumferential direction of the stopper rod, and the plurality of air blowing branches face to the same circumferential direction, bubbles rotating around the stopper rod are formed around the stopper rod, molten steel around the stopper rod is driven to rotate, and attachments in the water gap can be better cleaned.)

1. A continuous casting porous stopper rod comprising a rod body and a rod head connecting the rod body, further comprising:

(a) the blowing channel is arranged in the bar body and used for conveying protective gas;

(b) the blowing branch is arranged on the rod head and connected with the blowing channel and is used for distributing the protective gas conveyed by the blowing channel to all directions;

at least two blowing branches are arranged on the blowing device,

the method is characterized in that:

the air outlet directions of at least two air blowing branches have components along the circumferential direction of the stopper rod.

2. A continuous casting porous stopper rod according to claim 1, characterized in that: the air outlet direction of the air blowing branch is downward inclined.

3. A continuous casting porous stopper rod according to claim 1 or 2, characterized in that: the blowing branch is a multi-section broken line,

or a curve, or a combination of polylines and curves.

4. A continuous casting porous stopper rod according to claim 3, characterized in that: the projection line of the air outlet direction of the air blowing branch on the section perpendicular to the axial line direction of the stopper rod forms any one of the following ranges with the included angle with the circumference of the outer surface of the stopper rod,

(a) 10-80 degrees;

(b) 15-45 degrees;

(c) 20-30 degrees;

(d) 25-28 degrees.

5. A continuous casting porous stopper rod according to claim 3, characterized in that: the blowing branch comprises an outer port, and the width of the outer port is larger than the height of the outer port.

6. A continuous casting porous stopper rod according to claim 3, characterized in that: the blowing branch comprises an outer port, and the sectional area of the outer port is smaller than that of the blowing branch.

7. A continuous casting porous stopper rod according to any one of claim 6, characterized in that: the cross section of the air nozzle is oval or rectangular.

8. A continuous casting porous stopper rod according to any one of claims 4 to 7, characterized in that: the blowing branch comprises an outer port, and the sectional area of the outer port is smaller than that of the blowing branch.

9. A continuous casting porous stopper rod according to claim 3, characterized in that: the part of the blowing branch close to the outer surface of the club head is an outlet section which has any one or two of the following characteristics,

(a) is conical;

(b) the inner wall is provided with an inner spiral groove.

10. A continuous casting system comprising the continuous casting porous stopper rod of claims 1-9.

Technical Field

The invention relates to the technical field of molten steel continuous casting, in particular to a continuous casting porous stopper rod.

Background

And carrying out multi-furnace continuous casting in the molten steel continuous casting process, wherein the tundish uses a stopper rod to control flow. The stopper rod comprises a rod body and a rod head, and impurities with high melting point can be formed in molten steel in the pouring process along with the prolonging of the casting time, and the impurities can be attached to the outer layer of the stopper rod head in the pouring process, so that the flow control accuracy of the stopper rod head is seriously influenced.

In the prior art, impurities are flushed away through argon by arranging an argon blowing channel in the stopper rod. Furthermore, the argon blowing channel on the rod head is divided into a plurality of branches, a plurality of argon blowing holes are arranged near the contact position of the rod head and the bowl mouth, and the impurity resultant of the contact part of the water gap and the stopper rod head can be better cleaned. For example, the Chinese invention publication No. CN 203197234U is a porous stopper for continuous casting.

The invention discloses a high-quality steel continuous casting argon blowing stopper rod, a stopper rod argon blowing system and an argon blowing method, wherein a main channel (31) is communicated with a plurality of slit type channels (33) through a diffusion air chamber (32), outlets of the slit type channels (33) are dispersedly arranged on the bottom surface of a stopper rod head (2), and are dispersedly distributed in a water gap bowl part and an inner wall area through the slit type channels, so that the size and the distribution state of argon bubbles entering molten steel are improved, and impurities are removed and the water gap nodulation effect is improved through micro-dispersed argon bubble adsorption.

There is still a need for further improvements in such structures.

Disclosure of Invention

The invention aims to provide a continuous casting porous stopper rod which can better clean attachments in a water gap and improve water gap nodulation.

In order to solve the technical problem, the continuous casting porous stopper rod comprises a rod body and a rod head connected with the rod body, and further comprises: (a) the blowing channel is arranged in the bar body and used for conveying protective gas; (b) the blowing branch is arranged on the rod head and connected with the blowing channel and is used for distributing the protective gas conveyed by the blowing channel to all directions; the blowing branch is at least two, and the air outlet direction of the at least two blowing branches has a component along the circumferential direction of the stopper rod.

Because the air outlet direction of the plurality of air blowing branches has a component along the circumferential direction of the stopper rod, and the plurality of air blowing branches face to the same circumferential direction, bubbles rotating around the stopper rod are formed around the stopper rod, molten steel around the stopper rod is driven to rotate, and attachments in the water gap can be better cleaned.

Furthermore, the air outlet direction of the air blowing branch is downward inclined.

The gas outlet direction of the blowing branch has a circumferential component and a downward axial component, and the gas is blown to one side and is blown downward at the same time, so that the argon gas can stay in the molten steel for a longer time and is contacted more fully.

Furthermore, the blowing branch is a multi-section broken line, or a curve, or a combination of the multi-section broken line and the curve.

Preferably, the projection line of the air outlet direction of the air blowing branch on the section perpendicular to the axial direction of the stopper rod forms any one of the following ranges with the circumference of the outer surface of the stopper rod,

(a) 10-80 degrees;

(b) 15-45 degrees;

(c) 20-30 degrees;

(d) 25-28 degrees.

As an improvement, an air nozzle is arranged at the outer end part of the air blowing branch, and the width of the air nozzle is larger than the height of the air nozzle.

The flat air nozzle with larger width is arranged, so that the air bubbles are flat after being sprayed out, and the area in the horizontal direction is larger.

Further, the cross section of the air nozzle is oval or rectangular.

Furthermore, the sectional area of the air nozzle is smaller than that of the air blowing branch.

As an improvement, an air nozzle is arranged at the outer end part of the air blowing branch, and the sectional area of the air nozzle is smaller than that of the air blowing branch.

The gas is ejected from the gas nozzle, the flow velocity is increased due to the reduction of the cross section area, and the distance of the bubble ejection can be further increased.

As an improvement, the part of the blowing branch close to the outer surface of the rod head is an outlet section, the outlet section is conical, and an inner groove is formed in the inner wall of the outlet section.

The part of the blowing branch close to the outer surface of the rod head is an outlet section, and the outlet section has any one or two of the following characteristics that (a) the blowing branch is conical, and the conical outlet section can gradually accelerate the speed of gas; (b) the inner wall is provided with an inner spiral groove, the inner spiral groove enables gas to rotate at a high speed at the outlet section, and shearing force generated by gas-liquid collision is generated after the gas contacts liquid, so that smaller bubbles are formed.

The invention also relates to a continuous casting system comprising the continuous casting porous stopper rod.

After the structure is adopted, the air outlet directions of the plurality of air blowing branches have components along the circumferential direction of the stopper, and the plurality of air blowing branches face the same circumferential direction, so that air bubbles rotating around the stopper head are formed around the stopper head, surrounding molten steel is driven to rotate, and attachments on a bowl opening can be better cleaned.

The spiral blowing branch is arranged, so that the sprayed air flow is not one or more straight lines, but the air flow rotates around the surface of the club head, the formed air bubbles can better cover the surface of the club head, the area covered by the air bubbles is 2-10 times that of the conventional straight-through spitting hole, and the air bubbles can be contacted with more impurities.

As the bubbles are less prone to colliding, fusing and enlarging than those of the conventional straight-through spitting hole, the bubbles can be kept fine for a longer time, the specific surface area of the gas is increased, and impurities in the molten steel are better prevented from being attached to the surface of the rod head. The bubbles formed by the same unit volume of argon can have longer retention time than the conventional bubbles discharged under the condition of satisfying the full floating, and the utilization rate of the gas reaches a better level.

The steel flow which rotates downwards can better drive the jet air flow of the rotary spitting hole, so that the formed air bubbles reach a distance (more than 1.5-2 times) which is longer than that of the air bubbles formed by the straight-through air flow, more impurities are driven to float upwards, and the probability of accumulation at the rod head and the bowl mouth is reduced.

The foregoing description is only an overview of the technical solutions of the present application, so that the technical means of the present application can be more clearly understood and the present application can be implemented according to the content of the description, and in order to make the above and other objects, features and advantages of the present application more clearly understood, the following detailed description is made with reference to the preferred embodiments of the present application and the accompanying drawings.

The above and other objects, advantages and features of the present application will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. Throughout the drawings, like elements or portions are generally identified by like reference numerals.

Fig. 1 is a schematic structural view of the present invention.

Fig. 2 is a schematic cross-sectional view of the present invention.

Fig. 3 is a schematic cross-sectional view of another form of the invention.

Fig. 4 is a perspective view of the present invention.

Fig. 5 is a schematic structural diagram of the present invention.

Fig. 6 is a cross-sectional view taken along plane B of fig. 5.

Fig. 7 is a schematic view of the outlet section of the blowing branch.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. In the following description, specific details such as specific configurations and components are provided only to help the embodiments of the present application be fully understood. Accordingly, it will be apparent to those skilled in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present application. In addition, descriptions of well-known functions and constructions are omitted in the embodiments for clarity and conciseness.

It should be appreciated that reference throughout this specification to "one embodiment" or "the embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearances of the phrase "one embodiment" or "the present embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

Further, the present application may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed.

The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, B exists alone, and A and B exist at the same time, and the term "/and" is used herein to describe another association object relationship, which means that two relationships may exist, for example, A/and B, may mean: a alone, and both a and B alone, and further, the character "/" in this document generally means that the former and latter associated objects are in an "or" relationship.

The term "at least one" herein is merely an association relationship describing an associated object, and means that there may be three relationships, for example, at least one of a and B, may mean: a exists alone, A and B exist simultaneously, and B exists alone.

It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion.

As shown in fig. 1 to 4, the continuous casting porous stopper rod of the present invention comprises a rod body 1 and a rod head 2 connected with the rod body 1, and further comprises a blowing channel 3 arranged inside the rod body 1 for delivering a shielding gas, wherein the shielding gas is generally argon gas; the blowing branch 4 is arranged on the rod head 2 and connected with the blowing channel 3 and is used for distributing the protective gas conveyed from the blowing channel 3 to all directions; the blowing branches 4 are at least two, and the air outlet directions of at least two blowing branches 4 have components along the circumferential direction of the stopper rod, or have components along the tangential direction of the stopper rod. The blowing branches 4 are preferably 5.

That is, when the rod head 2 is a regular circle, the cross section a in the direction perpendicular to the axis of the stopper rod is a circle, and as shown in fig. 5 and 6, the intersection line of the outer surface of the rod head and the cross section a is a circle B, and the included angle θ between the projection line C of the air outlet direction of the air blowing branch on the cross section a and the circle B is an acute angle. However, the projection line of the air outlet direction of the air outlet hole of the stopper rod in the prior art on the section A and the circumference B form an included angle which is generally vertical, that is, the air outlet direction only has an axial component.

Because the air outlet direction of the plurality of air blowing branches has a component along the circumferential direction of the stopper rod, and the plurality of air blowing branches face to the same circumferential direction, air bubble flow rotating around the stopper rod is formed around the stopper rod, so that surrounding molten steel is driven to rotate, and attachments in a water gap can be better cleaned.

Preferably, the included angle between the projection line of the air outlet direction of the air blowing branch on the cross section perpendicular to the axis of the stopper rod and the circumference of the outer surface of the stopper rod can be optimized, and a large number of experiments show that when the included angle is 10-80 degrees, the effect of the invention is obvious, and preferably when the included angle is 15-45 degrees, the coverage area of bubbles is greatly improved, so that the bubbles can be contacted with more impurities; preferably 20 to 30 degrees, the specific surface area of the bubbles is optimized, and the surface of the club head has few impurities attached. The optimal angle is 25-28 degrees.

As shown in fig. 1, the gas outlet direction of the blowing branch 4 is inclined downwards, the gas outlet direction of the blowing branch 4 has a circumferential component and a downward axial component, and the gas is blown downwards while blowing towards one side, so that the argon gas stays in the molten steel for a longer time and is contacted more fully. The air outlet direction of the air blowing branch 4 can also be horizontal.

As shown in FIG. 3, the duct of the blowing branch 4 is formed by connecting a plurality of segments of broken lines, or may be a whole segment of curved line starting from the blowing channel 3 and ending at the outer surface of the club head, or may be a combination of a plurality of segments of broken lines and curved lines, for example, only one end near the outer surface of the club head is straight, and the inner segment is curved.

The outer end part of the blowing branch 4 is provided with an air nozzle 5, and the width w of the air nozzle 5 is larger than the height h. Preferably, the width w may be set to be about 2 times the height h. The height h here means the dimension in the direction parallel to the axial direction of the stopper rod, and the width w means the dimension in the direction perpendicular to the axial direction of the stopper rod. The flat air nozzle 5 with larger width is arranged, so that the air bubbles are flat after being sprayed out, and the area in the horizontal direction is larger. The cross-section of the air nozzle 5 may be oval or rectangular or nearly rectangular in shape.

The sectional area of the air nozzle 5 is smaller than that of the air blowing branch 4. Since the flow velocity becomes large due to the reduction in the sectional area when the gas is ejected from the gas nozzle 5, the distance of the ejection of the bubble can be made longer.

As shown in FIG. 7, the portion of the blowing branch 4 near the outer surface of the club head 2 is an outlet section 41, and the inner wall of the outlet section 41 is provided with an internal groove 411. The inner spiral groove enables gas to rotate at a high speed at the outlet section, and shearing force generated by gas-liquid collision after the gas contacts liquid forms smaller bubbles. The outlet section 41 is conical. The conical outlet section allows the gas to be accelerated gradually.

The invention also relates to a continuous casting system using the continuous casting porous stopper rod.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the present invention in any way, so that any person skilled in the art can make changes or modifications to the equivalent embodiments using the above disclosure. Any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the scope of the present invention, unless they depart from the technical spirit of the present invention.