CN114160781A - Multi-air-passage stopper rod - Google Patents

Abstract

The invention discloses a multi-air-passage stopper rod, and relates to the technical field of stopper rods. The multi-air-passage stopper rod comprises a stopper rod body and a stopper rod head, wherein the bottom of the stopper rod body is connected with the stopper rod head, the stopper rod body comprises a stopper rod shell and a rod core, and the rod core is nested in the inner layer of the stopper rod shell; a main channel and a branch channel are arranged in the rod core, and two ends of the main channel are respectively connected with an argon gas inlet hole and a stopper rod head; the stopper rod shell is internally provided with a side channel, and one end of the branch channel is connected with the argon gas inlet hole and communicated with the side channel. The invention not only can realize the inhibition effect on the confluence vortex generated at the water gap, but also further develops the design of the existing stopper rod, further increases the space utilization rate of the stopper rod and can more flexibly blow argon.

Description

Multi-air-passage stopper rod

Technical Field

The invention relates to the technical field of stopper rods, in particular to a multi-air-passage stopper rod.

Background

In the process of continuous casting of steel and iron, the tundish has the functions of stabilizing steel flow, reducing inclusions and the like, and the stopper rod connected above the water gap of the crystallizer has important influences on whether molten steel can be stably solidified in the crystallizer to form an ingot and the quality of a finished product, is an important device for controlling the flowing state of the molten steel entering the crystallizer, and has the function of removing and controlling the inclusions at the water gap.

The stopper rod generally used at present basically comprises a stopper rod body, a rod head at the bottom of the stopper rod and an argon pipeline inside the stopper rod. The stopper rod body is used for performing the most important function of controlling the flow of the water gap, and the built-in argon pipeline is used for removing the sediment of impurities accumulated in the gap between the water gap and the stopper rod so as to ensure the normal operation of water gap casting and prevent the crushed accumulated impurity particles from being doped into a casting blank to form large impurities and influence the quality of the casting blank. The existing stopper rod design does not take the confluence vortex generated by the flowing of continuous casting molten steel at a water gap into consideration, and the confluence vortex can bring about slag entrapment and other hazards, thereby seriously affecting the quality of casting blanks. In addition, the existing stopper rod design is regarded as a whole structure, the inner part is not worn out as much as the outer part, the stopper rod needs to be replaced together when being replaced, and because the inner part is also made of refractory materials, other devices which are more convenient to use are not suitable to be added into the inner part, and the position and occupied space of the stopper rod in a tundish cannot be fully utilized. In the design of the known stopper rod, a plurality of switches for controlling argon blowing are not arranged outside, because the argon pipelines of the stopper rod are only a main pipeline responsible for bottom blowing, the main purpose of argon blowing is only to clear deposited impurities at a water gap at the head of the stopper rod, the beneficial effects of other argon blowing cannot be considered, the function of argon blowing is single, and the argon cannot be flexibly utilized due to the limitation of molten steel fluctuation in a crystallizer at the lower part of the water gap.

Through the retrieval, chinese patent application number is 201320187371.6's application, discloses a porous stopper rod for continuous casting, and it includes the stopper rod body and connects in the stopper rod head of stopper rod body bottom, the argon gas passageway has been seted up to stopper rod body inside, the argon gas passageway extends to inside the stopper rod head, the air guide hole has been seted up to the overhead level of stopper rod, the air guide hole is perpendicular with argon gas passageway axis, the air guide hole sets up in mouth of a river and stopper rod head contact surface top and communicates with the argon gas passageway. This application is through setting up a plurality of air guide holes in stopper stick head department, though can be fine clear away mouth of a river department inclusion, slow down the unstable state of molten steel, but can not effectively restrain the production of confluence swirl, and the effect to improving whole molten steel flow stability is not good.

For another example, the chinese patent application No. 201520241089.0 discloses a diffusive argon blowing stopper for continuous casting, which includes a stopper body and a stopper head fixed at the front end of the stopper body, wherein an argon passage leading to the stopper head is provided in the stopper body, the stopper head is made of a porous material, and argon is diffusively blown into molten steel through the porous material. The stopper rod head of this application does not establish the gas guide hole, but blows in argon gas through the porous material dispersedly that apparent porosity is great, and the homogeneity that argon gas was blown in is good, can clear away the impurity of deposit on the stopper rod head, improves accuse and flows the precision. However, the application does not improve the flow field at the water gap, and the confluence vortex is generated.

Disclosure of Invention

1. Problems to be solved

The invention aims to overcome the problems that confluence vortex is easy to generate at a water gap to influence the quality of a casting blank and the argon blowing function is single in the prior art, and provides a multi-air-passage stopper rod for flow suppression of a tundish.

2. Technical scheme

In order to solve the problems, the technical scheme adopted by the invention is as follows:

the invention relates to a multi-air-passage stopper which comprises a stopper body and a stopper head, wherein the bottom of the stopper body is connected with the stopper head, the stopper body comprises a stopper shell and a rod core, and the rod core is nested in the inner layer of the stopper shell; a main channel and a branch channel are arranged in the rod core, and two ends of the main channel are respectively connected with an argon gas inlet hole and a stopper rod head; the stopper rod shell is internally provided with a side channel which is communicated with a branch channel, and one end of the branch channel is communicated with an argon gas inlet.

Furthermore, the branch channels are provided with a plurality of air guide holes along the axial direction of each branch channel, and the air guide holes are arranged at positions corresponding to the side channels and communicated with the side channels.

Furthermore, the branch channels are arranged in groups, a single group of branch channels is arranged in 1-3, each group of branch channels is arranged on the circumference taking the main channel as the center, and the two opposite groups of branch channels are symmetrically distributed by taking the main channel as the axis.

Furthermore, an annular transition channel is arranged between two branch channels which are axially and symmetrically distributed by taking the main channel as an axis, the air guide holes positioned at the same height of the branch channels are connected through the transition channel, and the transition channel is communicated with the side channel.

Furthermore, the side channels are integrally inclined downwards, the angle of the side channels inclined downwards relative to the horizontal direction is 5-30 degrees, and the inclination angles of the side channels from the lower position to the higher position are increased in sequence.

Further, the stopper rod shell comprises an upper shell and a lower shell, wherein the upper shell comprises a transition ring and an erosion resistant ring, the erosion resistant ring is arranged between the transition ring and the lower shell, and the side channel is arranged in the lower shell.

Further, the height of the lower shell is smaller than that of the inner rod core; the erosion resistant ring be hollow cylinder, shape, the size of inside matching rod core, the thickness of this erosion resistant ring is greater than the lower part shell, and the one end that the lower part shell was connected to the erosion resistant ring sets up hollow ring, this hollow ring cover is located on the shell of lower part.

The stopper rod further comprises a fixing ring, the fixing ring is a hollow cylinder, an internal thread is formed in the fixing ring, an external thread is arranged at the top of the rod core, and the fixing ring is connected with the rod core through the thread; the fixed ring is provided with a hanging ring.

Furthermore, a convex block is arranged at the bottom of the rod core, and a concave notch matched with the convex block is formed in the lower shell; one end of the rod core is limited by the lower shell, and the other end of the rod core is matched with the fixing ring to clamp and fix the transition ring and the erosion-resistant ring between the fixing ring and the lower shell.

Furthermore, the fixing ring is made of high-strength metal, and the erosion-resistant ring is made of refractory bricks with strong erosion resistance.

3. Advantageous effects

Compared with the prior art, the invention has the beneficial effects that:

(1) the invention relates to a multi-air-passage stopper rod, wherein a side channel is arranged in a stopper rod shell, a main channel and a branch channel are arranged in a rod core, two ends of the main channel are respectively connected with an argon gas inlet hole and a stopper rod head, the branch channel is mutually communicated with the side channel, and the top of the branch channel is connected with the argon gas inlet hole. This kind of design makes main entrance and a branch passageway mutually independent, can accomplish under the main entrance stops the condition of blowing, and the side passageway still can carry argon gas in order to reach the effect that restraines the swirl of converging, has practiced thrift the use amount of argon gas when guaranteeing effectively to restrain the swirl of converging.

(2) According to the multi-air-passage stopper rod, the plurality of branch passages are arranged, the plurality of air guide holes are formed in each branch passage along the axial direction of the branch passage and are communicated with the side passage, and the side passages are arranged at different heights, so that argon flow can be blown out of a specific position of a tundish, a molten steel flow field above a water outlet is disturbed, a confluence vortex generated by molten steel outflow is damaged, slag entrapment is prevented, the quality of a casting blank is ensured, and meanwhile, the erosion and scouring of the stopper rod and the inner wall of the tundish due to the confluence vortex are reduced.

(3) The invention relates to a multi-air-passage stopper rod, wherein an annular transition passage is arranged between two branch passages which are axially and symmetrically distributed by taking a main passage as an axis, air guide holes at the same height of the branch passages are connected through the transition passage, and the transition passage is communicated with a side passage. The design can ensure that the argon flows blown out from the side channels at the same height are the same, so that the molten steel flow field at the height is more balanced and stable, the arrangement of the transition channel can also effectively prolong the flow path of the argon in the pipeline, and the whole molten steel flow field state can be more effectively regulated and controlled.

(4) According to the multi-air-passage stopper rod, the upper shell and the lower shell are separately designed, so that the upper shell and the lower shell can be independently replaced according to respective corrosion conditions, and the cost is saved. In addition, the upper shell comprises an erosion-resistant ring and a transition ring, because the erosion-resistant ring is positioned at the steel slag interface, a material with strong erosion resistance can be selected, and the transition ring can be made of a common material, so that the durability of the upper part of the stopper rod is ensured, and the waste of the erosion-resistant material is avoided.

(5) According to the multi-air-passage stopper rod, the joint of the erosion-resistant ring and the lower shell is designed by the retaining wall, so that molten steel can be effectively prevented from entering the stopper rod through gaps among components, and an argon pipeline is eroded. And the retaining wall design with enough length can also effectively prevent the lower shell from shifting due to the impact of molten steel, thereby ensuring the stability of the connection of the upper shell and the lower shell, and in addition, the retaining wall adopts the design of thickening and corrosion resistance, so that the service life of the part corroded by the slag line at the position is effectively prolonged.

Drawings

FIG. 1 is a front sectional view of the overall construction of the multi-airway plug rod of the present invention;

FIG. 2 is a front sectional view of the lower housing of the present invention;

FIG. 3 is a front sectional view of the upper housing of the present invention;

FIG. 4 is a top view of a rod core structure in example 1 of the present invention;

fig. 5 is a top view of a rod core structure in example 2 of the present invention.

In the figure: 1. a stopper rod housing; 11. an upper housing; 110. a transition ring; 111. an erosion resistant ring; 112. retaining walls; 12. a lower housing; 121. a side channel; 122. a bump;

2. a stopper rod head;

3. a rod core; 31. a main channel; 32. a branch channel; 33. an air vent;

4. a fixing ring; 41. a hoisting ring; 5. a transition passage.

Detailed Description

The invention is further described with reference to specific examples.

Example 1

As shown in figure 1, the multi-air-channel stopper of the embodiment comprises a stopper body and a stopper head 2, wherein the bottom of the stopper body is connected with the stopper head 2, the stopper body comprises a stopper shell 1 and a rod core 3, and the rod core 3 is nested in the inner layer of the stopper shell 1. Wherein, the rod core 3 and the stopper rod shell 1 are prepared separately, and the main material of the rod core 3 is high temperature resistant metal. The stopper rod comprises a stopper rod shell 1, a plurality of groups of side channels 121 communicated with the inside and the outside of the stopper rod shell 1 are arranged in the stopper rod shell, an argon channel which is an important component of the stopper rod is arranged in a rod core 3, the argon channel is communicated with the side channels 121 in the stopper rod shell 1 and the argon channel at the bottom after the stopper rod is integrally combined, and each argon channel is made of refractory materials and can be controlled to be communicated with argon from the outside in groups. Through set up multiunit side passageway 121 in stopper stick shell 1, can blow off the argon gas stream in the specific position of middle package, produce the disturbance to delivery port top molten steel flow field, destroy because of the vortex of converging that the molten steel outflow produced, prevent the curling slag, alleviate the molten steel because of converging the erosion and wash of vortex to stopper stick and middle package inner wall. Simultaneously through detachable construction design and metal system stick core, save the stopper stick and change used material, make full use of stopper stick inner space improves the stopper stick functional in the middle package, practices thrift the cost.

As shown in fig. 2, a side passage 121 is formed in the stopper housing 1 at a height h1, h2, h3 from the stopper bottom, and the side passage 121 communicates with the argon gas passage in the inner rod core 3, and the gas blowing time corresponding to the external argon gas passage, i.e., the side passage 121, is controlled by opening and closing the argon gas passage of the inner rod core 3. By arranging the side channels 121 at different heights of the stopper rod, the conflux vortex can be destroyed under the condition that the flow field above the water outlet does not influence the continuous casting process, the phenomenon of slag entrapment caused by the conflux vortex and the corrosion to the lining of the tundish are prevented, the flow field at the water outlet of the tundish is improved, impurities entering the crystallizer are reduced, the cleanliness of molten steel is improved, and the quality of a casting blank is improved. The argon gas passageway of inside stick core 3 links to each other with side passageway 121, can control the ventilation volume and the time of stick core argon gas passageway like this in the outside, controls the opportunity that each group's argon gas passageway blew off argon gas in the stopper stick at the continuous casting in-process and blew off the volume, reduces the quantity of argon gas, guarantees the application efficiency of argon gas and guarantees the economic nature simultaneously. The side channels 121 are made of dispersed porous refractory materials, so that bubbles formed by blowing out argon gas are different in size, the impact force of air flow is reduced, the blown-out argon gas cannot have excessive influence on a molten steel flow field, and the formed bubbles can absorb inclusions in various stages. Meanwhile, the channel made of the refractory material can prevent molten steel from entering the interior of the stopper rod to damage the stopper rod and pollute the molten steel.

The side channels 121 of the respective heights have different inclination angles, and as shown in fig. 2, the side channels 121 are inclined downward 5 to 30 ° with respect to the horizontal as a whole, specifically, the side channels 121 of the height h1 are inclined downward 0 to 5 °, the side channels 121 of the height h2 are inclined downward 5 to 15 °, and the side channels 121 of the height h3 are inclined downward 15 to 30 °. The channel direction is downward, can alleviate the erosion of molten steel to the channel gap, and make the argon gas flow have than the action orbit that upwards is longer, be convenient for adsorb bubble and inclusion in the molten steel, blow down also be favorable to the destruction and the suppression to the vortex of converging. However, too large a downward inclination angle is also disadvantageous in terms of the trajectory of the argon gas flow in the tundish, and may cause unnecessary erosion of the stopper edge, and the influence on the converging swirl is also smaller, and it is preferable to consider the downward inclination angle to be 5 to 30 °. The reason why the inclination angles of the side channels 121 are different at each height is that the lower the side channel 121 is, the stronger the influence of the argon flow blown out from the side channel 121 on the flow field at the nozzle is, and the lower the inclination angle of the side channel 121 at the height h1 is, the lower the inclination angle of the side channel 121 is. The destruction that can guarantee the swirl of converging is complete like this, makes the molten steel flow field more balanced and can not influence the mouth of a river and annotate and flow, and the action orbit of argon gas in molten steel is inside simultaneously, the absorption molten steel inclusion that can be better.

In this embodiment, the argon gas channel in the rod core 3 is divided into a main channel 31 and a branch channel 32, two ends of the main channel 31 are respectively connected with the argon gas inlet hole and the stopper rod head 2, the branch channel 32 is communicated with the side channel 121, and one end of the branch channel 32 is connected with the argon gas inlet hole. As shown in fig. 4, the stopper rod core 3 is designed with a special argon gas channel, which has an axial through pipe as a main channel 31, an argon gas inlet at the upper part and a lower rod head connected at the lower part, the rod core 3 is provided with four semi-closed channels as branch channels 32, the branch channels 32 are respectively communicated with the gas guide holes 33 at one side and are communicated with the side channels 121 through the gas guide holes 33. The upper part of the semi-closed channel is connected with an air inlet device for conveying air, and the bottom part of the semi-closed channel is provided with an air guide hole 33 with the lowest depth and is not communicated with the rod head.

This special rod core design can guarantee that main entrance 31 has sufficient pipe diameter, simultaneously, separately handles branch passageway 32 and main entrance 31, can accomplish the stopper stick lower part and stop under the condition of blowing, and the side still can carry argon gas in order to reach the effect that restraines the swirl of converging, can be more efficient more nimble utilize argon gas. The gas transmission system of the stopper rod is divided into five independent gas transmission systems which are not influenced mutually, so that the gas transmission is controlled conveniently, and the flow field in the molten steel is controlled effectively more easily. This design focuses on controlling the flow field effect of the stopper rod in a certain orientation.

As shown in fig. 2 and 3, the stopper rod housing 1 comprises an upper housing 11 and a lower housing 12, and a plurality of sets of side channels 121 are provided in the lower housing 12. The height of the lower shell 12 is smaller than that of the inner rod core 3, the upper edge of the lower shell is lower than that of a steel slag interface, the upper shell 11 is divided into two parts, namely an erosion-resistant ring 111 and a transition ring 110 from bottom to top, the materials of the erosion-resistant ring 111 and the transition ring 110 are different, the materials used by the erosion-resistant ring 111 are refractory bricks with strong erosion resistance, the thermal expansion coefficient of the refractory bricks is ensured to be small or moderate, the material of the transition ring 110 has no specific requirements, but the friction coefficient of the upper surface is required to be small, and the lower surface is sufficiently flat and free of defects. The erosion-resistant ring 111 is a hollow cylinder in shape, the inside of the erosion-resistant ring matches the shape and size of the rod core 3, the thickness of the main part of the erosion-resistant ring is larger than that of the lower shell 12, and the outermost side of the lower part is provided with a hollow ring with the length of about 50-100mm and the thickness of about 20-40mm, the hollow ring can be just sleeved on the lower shell 12 to sleeve the upper shell and the lower shell together, namely, a retaining wall 112 is formed at the joint. Meanwhile, the bottom of the rod core 3 is provided with a protruding edge with the thickness of about 30-50mm, relative to the cylindrical shape of the main body, the edge is a rectangle with the side length of 60-80mm, and similarly, the lower shell 12 lacks the corresponding volume, so that the two are kept in fit after being assembled.

The design complements the practicability of the whole stopper rod, the retaining wall type design of the lower part of the erosion-resistant ring 111 can effectively prevent molten steel from entering an erosion channel in the stopper rod through gaps among the parts, the retaining wall with enough length can also effectively prevent the lower rod body from being deviated due to the impact of the molten steel, the good connection of the upper shell and the lower shell can be ensured, and the bad influence on the stability of the whole stopper rod can be avoided; meanwhile, the thickest material with the strongest erosion resistance can be adopted for the slag line part which is most easily eroded and has the shortest service life in the working process of the stopper rod, so that the service life of the stopper rod is prolonged. The separate design of the upper housing 11 ensures that the housing has a high strength and at the same time is easy to fire. In addition, the replacement of the parts at the slag line with large refractory loss can be realized under the condition of not replacing the lower material, so that the material is saved and the cost is reduced. The lower upper surface friction coefficient required for the transition ring 110 is for the installation of the fixing ring 4, the lower friction coefficient can better tighten the fixing ring 4, the tightness of the shell is ensured, the gap is reduced, the close contact between the components is ensured, and the thermal expansion coefficient required for the erosion-resistant ring 111 is stress for avoiding the deformation of the rod body due to high-temperature expansion.

In this embodiment, the outer surface of the upper part of the rod core 3 is provided with an external thread which is matched with the internal thread of the fixing ring 4. The fixing ring 4 is arranged at the top of the integral stopper rod, the main body of the fixing ring is a hollow cylinder, the main material of the fixing ring is high-strength metal, the inner side of the fixing ring is provided with an internal thread matched with the external thread of the rod core 3, the upper part of the fixing ring is provided with a hanging ring 41, and the outer side wall surface of the fixing ring requires a larger friction coefficient. The fixing ring 4 is tightly connected with the rod core 3 through threads, and meanwhile, downward force is applied to the upper shell 11, so that the upper shell and the lower shell of the stopper rod are tightly attached, and the integral tightness is ensured. The bigger coefficient of friction that solid fixed ring 4 lateral wall face has helps the centre gripping stable, and rings 41 can reduce the shear stress that the supporting rod received, also be convenient for reciprocating of stopper rod simultaneously, be convenient for adjust the stopper rod height.

Example 2

The structure of the multi-airway stopper rod in this embodiment is basically the same as that in embodiment 1, and the main difference is that: the specific structure of the rod core 3 is different, as shown in fig. 5, the rod core 3 is designed with a special argon gas channel, which has an axial through pipe as a main channel 31, the upper part is an inlet, the lower part is connected with a rod head, six branch channels 32 are arranged in the rod core 3, each branch channel 32 is provided with a plurality of air guide holes 33 along the axial direction, an annular transition channel 5 is arranged between two branch channels 32 which are axially symmetrically distributed by taking the main channel 31 as the axis, the air guide holes 33 which are positioned at the same height on the branch channels 32 are connected through the transition channel 5, the transition channel 5 is communicated with a side channel 121, and the connection part of the side channel 121 and the transition channel 5 is positioned on the central line of the included angle of the branch channel 32 and is centrally symmetrically distributed. The diameters of the transition passages 5 at all heights in the horizontal direction are different; the transition channel 5 with h1 height is innermost, the transition channel 5 with h3 height is outermost, and each group of air vents has no extension part inside the transition channel 5.

This special rod core design can guarantee to have sufficient flow in the passageway, simultaneously, handles branch channel 32 alone, can stop when conveying gas at the main entrance, and each side passageway still can blow out the argon gas stream and restrain the swirl that converges, can be in the condition that does not influence crystallizer work, better control top flow field. The design of the transition channel 5 can ensure that the argon flows blown out from the side channels 121 at the same height are the same, so that the flow field at the height is more balanced and stable; the arrangement of the transition passages 5 also takes into account the overall path of the argon within the set of passages, preventing the problem of short paths for the argon to reach the side passages 121. The design divides the stopper rod gas transmission system into four independent gas transmission systems which are not influenced mutually, flow control can be carried out on side channels with various heights, and the design focuses on regulating and controlling the flow field state in the height direction of the stopper rod.

The stopper rod housing 1 may be provided with a plurality of differently oriented but integrally identically constructed side channels 121 at each level. The number of the side channels 121 at each height is not fixed, but if the number of the side channels 121 is too large, argon flows of the side channels 121 are affected mutually, molten steel flow is disturbed, the strength of the stopper rod at the height is reduced, the stopper rod is easy to bend and break under the impact of the molten steel, and serious production accidents are caused; with a smaller number of side channels 121, there is not enough kinetic energy to affect the converging swirl, and the cost is not compatible with the resulting effect. When the side channels 121 are set to be 4 or 6 equidistant channels, a better flow field state is generated above the water outlet of the tundish, the argon flows cannot be greatly influenced mutually, and the converging vortex is greatly inhibited.

The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.

Claims (10)

1. The utility model provides a many air flue stopper stick, includes stopper stick body and stopper stick head (2), stopper stick body bottom links to each other its characterized in that with stopper stick head (2): the stopper rod body comprises a stopper rod outer shell (1) and a rod core (3), and the rod core (3) is nested in the inner layer of the stopper rod outer shell (1); a main channel (31) and a branch channel (32) are arranged in the rod core (3), and two ends of the main channel (31) are respectively connected with the argon gas inlet hole and the stopper rod head (2); a side channel (121) is arranged in the stopper rod shell (1), the side channel (121) is communicated with the branch channel (32), and one end of the branch channel (32) is communicated with an argon gas inlet.

2. A multi-airway plug rod as claimed in claim 1 in which: the branch channels (32) are provided with a plurality of air guide holes (33) along the axial direction of each branch channel (32), and the air guide holes (33) are arranged at positions corresponding to the side channels (121) and communicated with the side channels (121).

3. A multi-airway plug rod as claimed in claim 2 in which: the branch channels (32) are arranged in groups, 1-3 single group of branch channels (32) are arranged, each group of branch channels (32) are arranged on the circumference taking the main channel (31) as the center, and the two opposite groups of branch channels (32) are symmetrically distributed by taking the main channel (31) as the axis.

4. A multi-airway plug rod as claimed in claim 3 in which: an annular transition channel (5) is arranged between two branch channels (32) which are axially and symmetrically distributed by taking the main channel (31), the air guide holes (33) of the branch channels (32) at the same height are connected through the transition channel (5), and the transition channel (5) is communicated with the side channel (121).

5. A multi-airway plug rod as claimed in claim 4 in which: the side channels (121) are inclined downwards integrally, the angle of the side channels (121) inclined downwards relative to the horizontal direction is 5-30 degrees, and the inclination angles of the side channels (121) from the low position to the high position are increased in sequence.

6. A multiple airway stopper rod as claimed in any one of claims 1 to 5 wherein: the stopper rod shell (1) comprises an upper shell (11) and a lower shell (12), wherein the upper shell (11) comprises a transition ring (110) and an erosion-resistant ring (111), the erosion-resistant ring (111) is arranged between the transition ring (110) and the lower shell (12), and the side channel (121) is arranged in the lower shell (12).

7. A multi-airway plug rod as claimed in claim 6 in which: the height of the lower shell (12) is less than that of the inner rod core (3); the erosion-resistant ring (111) is a hollow cylinder, the inside of the erosion-resistant ring is matched with the shape and the size of the rod core (3), the thickness of the erosion-resistant ring (111) is larger than that of the lower shell (12), a hollow ring is arranged at one end, connected with the lower shell (12), of the erosion-resistant ring (111), and the hollow ring is sleeved on the lower shell (12).

8. A multi-airway plug rod as claimed in claim 7 in which: the stopper rod further comprises a fixing ring (4), the fixing ring (4) is a hollow cylinder, an internal thread is formed in the fixing ring (4), an external thread is formed in the top of the rod core (3), and the fixing ring (4) is in threaded connection with the rod core (3); the fixed ring (4) is provided with a hanging ring (41).

9. A multi-airway plug rod as claimed in claim 8 in which: the bottom of the rod core (3) is provided with a convex block (122), and a concave notch matched with the convex block (122) is formed in the lower shell (12); one end of the rod core (3) is limited by the lower shell (12), the other end of the rod core is matched with the fixing ring (4), and the transition ring (110) and the erosion-resistant ring (111) are clamped and fixed between the fixing ring (4) and the lower shell (12).

10. A multi-airway plug rod as claimed in claim 9 in which: the fixing ring (4) is made of high-strength metal, and the erosion resistant ring (111) is made of refractory bricks with strong erosion resistance.

Images