CN217577065U - Unloading elephant trunk device - Google Patents

Abstract

The utility model provides a blanking chute device, belonging to the technical field of ladle refining, comprising a multi-stage blanking pipe section, a material spreading pipe section and a plurality of groups of connecting pipe sections; the multi-stage blanking pipe sections are arranged at intervals up and down; the axis of each stage of blanking pipe section is obliquely arranged relative to the vertical direction, and the inclination angles of the multistage blanking pipe sections relative to the vertical direction are sequentially increased from top to bottom; the feed inlet of the blanking pipe section positioned at the top is communicated with the discharge outlet of blanking equipment; the material spreading pipe section is arranged at the discharge port of the last-stage blanking pipe section, and the discharge port of the material spreading pipe section faces to one side far away from the argon gas inlet of the ladle refining furnace; the plurality of groups of connecting pipe sections are arranged at intervals up and down; and the feed inlet of each group of connecting pipe sections is communicated with the discharge outlet of the upper-stage blanking pipe section, and the discharge outlet is communicated with the feed inlet of the lower-stage blanking pipe section or the feed inlet of the material scattering pipe section. The utility model provides an unloading elephant trunk device can effectively avoid pushing up the phenomenon of sediment "caking", slows down the abominable problem of slag condition.

Description

Unloading elephant trunk device

Technical Field

The utility model belongs to the technical field of the ladle refining, more specifically say, relate to an unloading elephant trunk device.

Background

The ladle refining furnace is equipment with the heating and refining functions of a steel furnace, and has the functions of deoxidizing, desulfurizing, adjusting temperature and components and improving the cleanliness of molten steel. When the molten steel in the ladle refining furnace is refined, auxiliary materials and other alloy materials are required to be added into the molten steel through a blanking device; in the process of refining the molten steel, argon is required to be introduced to reduce the content of impurity gases dissolved in the molten steel, remove residual nonmetallic inclusions in the molten steel and ensure that the components and the temperature of the molten steel are uniform before casting.

In the existing blanking device, auxiliary materials are usually directly added into a refining furnace, and the auxiliary materials directly introduced are easily influenced by argon introduced into the refining furnace, so that the phenomenon of auxiliary material accumulation is generated, and the added auxiliary materials and alloy materials are fast in descending speed in a blanking chute, so that slag materials are easy to fall intensively, and the problem of slag material accumulation is easy to occur; and the slag materials can generate the phenomenon of caking of the top slag of the steel ladle when being accumulated, thereby causing the problem of bad slag conditions.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an unloading elephant trunk device aims at solving current unloader and easily takes place to push up sediment "caking" phenomenon, causes the abominable technical problem of slag condition.

In order to achieve the purpose, the utility model adopts the technical proposal that: the utility model provides a unloading elephant trunk device for set up the top at ladle refining furnace, unloading elephant trunk device includes:

the multistage blanking pipe sections are arranged at intervals up and down; the axis of each stage of blanking pipe section is obliquely arranged relative to the vertical direction, and the inclination angles of the plurality of stages of blanking pipe sections relative to the vertical direction are sequentially increased from top to bottom; the feed inlet of the blanking pipe section positioned at the top is communicated with the discharge outlet of blanking equipment;

the material spreading pipe section is arranged at the discharge port of the last-stage blanking pipe section, and the discharge port of the material spreading pipe section faces to one side far away from the argon gas inlet of the ladle refining furnace; and

a plurality of groups of connecting pipe sections which are arranged at intervals up and down; and every group the feed inlet of connecting the pipeline section communicates with last one-level the discharge gate of unloading pipeline section, except that last one set of connecting the pipeline section, every group the discharge gate of connecting the pipeline section communicates with next one-level the feed inlet of unloading pipeline section, last one set of the discharge gate of connecting the pipeline section with spill the feed inlet intercommunication of material pipeline section.

In one possible implementation, the multistage blanking pipe section includes:

the feeding hole of the primary pipe section is communicated with the discharging hole of the blanking equipment, and the inclination angle of the primary pipe section relative to the vertical direction is 8-12 degrees;

the secondary pipe section is positioned below the primary pipe section, and the inclination angle of the secondary pipe section relative to the vertical direction is 38-42 degrees; and

the third-stage pipe section is positioned below the second-stage pipe section, and the inclination angle of the third-stage pipe section relative to the vertical direction is 63-67 degrees;

and a group of connecting pipe sections are respectively connected between the primary pipe section and the secondary pipe section, between the secondary pipe section and the tertiary pipe section and between the tertiary pipe section and the material scattering pipe section.

In one possible embodiment, the axis of the spreading pipe section is arranged at an angle to the vertical, and the angle of inclination of the spreading pipe section to the vertical is 78 ° to 82 °.

In some embodiments, the material scattering pipe section is a hollow cone structure with a gradually increased cross-sectional area, a small diameter end of the cone structure is communicated with the connecting pipe section, and a discharge hole of the material scattering pipe section is formed in a large diameter end of the cone structure.

Illustratively, the discharge port of the material spreading pipe section extends to the upper part of the molten steel impact area of the ladle.

In one possible implementation, the plurality of sets of connection segments includes:

the upper ends of the first pipe sections are respectively communicated with the discharge hole of the feeding pipe section at the upper stage, and the lower ends of the first pipe sections are respectively communicated with the feed hole of the feeding pipe section at the lower stage;

and the upper end of the second pipe section is communicated with the discharge hole of the last-stage blanking pipe section, and the lower end of the second pipe section is communicated with the material scattering pipe section.

In some embodiments, the first pipe segment comprises:

the upper end of the first feeding section is communicated with the discharge hole of the feeding pipe section at the upper stage, and the inclination angle of the first feeding section relative to the vertical direction is the same as that of the feeding pipe section at the upper stage;

the first transition section is arranged below the first feeding section and provided with a first radian for transition from the feeding pipe section at the upper stage to the feeding pipe section at the lower stage; and

the upper end of the first discharging section is communicated with the first transition section, and the lower end of the first discharging section is communicated with a feeding hole of the next-stage discharging pipe section; and the inclination angle of the first discharging section relative to the vertical direction is the same as that of the next-stage discharging pipe section.

Illustratively, a first opening is formed in a side wall of the first transition section, and a first piston matched with the first opening is detachably connected to the first opening.

Illustratively, one end of the first piston extends into the first transition section and is screwed with the first transition section; the end face of the screwing end of the first piston is a smooth transition face tangent to the inner wall of the first transition section.

In some embodiments, the second pipe segment comprises:

the upper end of the second feeding section is communicated with the discharge hole of the last-stage blanking pipe section, and the inclination angle of the second feeding section relative to the vertical direction is the same as that of the last-stage blanking pipe section; and

and the second transition section is arranged below the second feeding section and has a second radian from the last stage of the blanking pipe section to the direction of the material scattering pipe section.

Compared with the prior art, the scheme shown in the embodiment of the application can increase the buffer area at the end part of the discharge port, reduce the blanking speed, prolong the blanking time and effectively prevent the phenomenon of concentrated falling and accumulation of slag charge by arranging the multistage blanking pipe sections; connecting pipe sections are arranged between the blanking pipe sections to connect the blanking pipe sections with different multistage inclination angles; and through setting up the material pipe section that spills to make the discharge gate orientation of spilling the material pipe section keep away from the one side that argon gas led to the mouth, make the discharge gate of auxiliary material fall behind and avoid the position of argon gas inlet opening top, thereby reduce the influence of the argon gas that lets in to the auxiliary material, make the auxiliary material towards the steel stream impact direction of ladle refining furnace tapping, very big promotion the sediment gold mix, thereby effectively avoided the phenomenon of top sediment "caking", slowed down the abominable problem of slag condition.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a first schematic structural view of a blanking chute device provided by an embodiment of the present invention;

fig. 2 is a schematic structural view of a blanking chute device provided by the embodiment of the present invention;

fig. 3 is a schematic structural view of a first pipe section of a blanking chute device provided by an embodiment of the invention;

fig. 4 is a schematic structural diagram of a second pipe section of the blanking chute device provided by the embodiment of the invention;

fig. 5 is a left side view structural diagram of the blanking chute device provided by the embodiment of the present invention.

In the figure: 1. a blanking pipe section; 11. a first-stage pipe section; 12. a secondary pipe section; 13. a third-stage pipe section; 2. a material spreading pipe section; 3. connecting the pipe sections; 31. a first tube section; 311. a first feed section; 312. a first transition section; 3121. a first opening; 313. a first discharging section; 32. a second tube section; 321. a second feed section; 322. a second transition section; 33. a first piston; 4. a ladle refining furnace; 41. an argon inlet; 5. and (5) blanking equipment.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

Referring to fig. 1 to 5, the blanking chute device of the present invention will now be described. The blanking chute device is arranged above the ladle refining furnace 4 and is used for introducing auxiliary materials into the ladle refining furnace 4. The blanking chute device comprises a multi-stage blanking pipe section 1, a material scattering pipe section 2 and a plurality of groups of connecting pipe sections 3; the multi-stage blanking pipe sections 1 are arranged at intervals up and down; the axis of each stage of blanking pipe section 1 is obliquely arranged relative to the vertical direction, and the inclination angles of the multistage blanking pipe sections 1 relative to the vertical direction are sequentially increased from top to bottom; the feed inlet of the blanking pipe section 1 positioned at the top is communicated with the discharge outlet of the blanking device 5; the material scattering pipe section 2 is arranged at the discharge port of the last-stage discharging pipe section 1, and the discharge port of the material scattering pipe section 2 faces to one side far away from an argon gas inlet 41 of the ladle refining furnace 4; the plurality of groups of connecting pipe sections 3 are arranged at intervals up and down; and the feed inlet of each group of connecting pipe sections 3 is communicated with the discharge outlet of the upper-stage blanking pipe section 1, except the last group of connecting pipe sections 3, the discharge outlet of each group of connecting pipe sections 3 is communicated with the feed inlet of the lower-stage blanking pipe section 1, and the discharge outlet of the last group of connecting pipe sections 3 is communicated with the feed inlet of the scattering pipe section 2.

It should be noted that the blanking chute device provided in the present application enables the added auxiliary materials to fall into the molten steel through the blanking pipe sections 1 and the multiple groups of connecting pipe sections 3 under the action of gravity and through the material scattering pipe sections 2, and to be mixed with the molten steel.

It should be understood that, in the present application, a plurality of groups of connecting pipe sections 3 are provided, and the discharge port of the last group of connecting pipe sections 3 is communicated with the feed port of the material scattering pipe section 2, and the discharge ports of the other connecting pipe sections 3 are communicated with the feed port of the next-stage blanking pipe section 1.

Compared with the prior art, the blanking chute device provided by the utility model has the advantages that the buffer area at the end part of the discharge port can be increased by arranging the multistage blanking pipe sections 1, the blanking speed is reduced, the blanking time is prolonged, and the phenomenon of centralized falling and accumulation of slag charge is effectively prevented; connecting pipe sections 3 are arranged between the blanking pipe sections 1 to connect the blanking pipe sections 1 with different multistage inclination angles; and spill material pipeline section 2 through setting up to make the discharge gate orientation of spilling material pipeline section 2 keep away from the one side that the argon gas led to the mouth 41, make the discharge gate of auxiliary material fall behind and avoid the position that the argon gas led to the mouth 41 top, thereby reduce the influence of the argon gas that lets in to the auxiliary material, make the auxiliary material towards the steel stream impact direction of 4 taps of ladle refining furnace, the very big promotion slag-metal mixture, thereby effectively avoided the phenomenon of top sediment "caking", slowed down the abominable problem of slag condition.

Optionally, the multi-stage blanking pipe section 1 may include 3-5 stages, wherein the inclination angles of adjacent pipe sections along the vertical direction are different and gradually increase from top to bottom, so as to reduce the blanking speed and prolong the blanking time, thereby preventing the auxiliary material or slag from being stacked due to too fast blanking. Meanwhile, in order to ensure the refining efficiency, the number of stages of the blanking pipe section 1 is not excessive; the specific number of stages and the inclination angle can be set according to actual needs.

Referring to fig. 1, in some possible embodiments, the multistage blanking pipe section 1 includes a primary pipe section 11, a secondary pipe section 12, and a tertiary pipe section 13; the feed inlet of the primary pipe section 11 is communicated with the discharge outlet of the blanking device 5, and the inclination angle of the primary pipe section 11 relative to the vertical direction is 8-12 degrees; the secondary pipe section 12 is positioned below the primary pipe section 11, and the inclination angle of the secondary pipe section 12 relative to the vertical direction is 38-42 degrees; the tertiary pipe section 13 is positioned below the secondary pipe section 12, and the inclination angle of the tertiary pipe section 13 relative to the vertical direction is 63-67 degrees; wherein, be connected with a set of connecting pipe section 3 respectively between first-stage pipeline section 11 and second grade pipeline section 12, between second grade pipeline section 12 and tertiary pipeline section 13 to and tertiary pipeline section 13 and spill material pipeline section 2.

It should be understood that the inclination angles used in the present application are all inclination angles along the vertical direction, i.e. the included angle between the axis of each corresponding pipe section and the coordinate line in the vertical direction.

Preferably, the inclination angle of the primary pipe section 11 relative to the vertical direction is 10 °, the inclination angle of the secondary pipe section 12 relative to the vertical direction is 30 °, and the inclination angle of the tertiary pipe section 13 relative to the vertical direction is 75 °; it can also be understood that the inclination angle of the primary pipe section 11 in the horizontal direction is 80 °, the inclination angle of the secondary pipe section 12 in the horizontal direction is 50 °, and the inclination angle of the tertiary pipe section 13 in the horizontal direction is 25 °.

It should be noted that, when the actual length of the material scattering pipe section 2 is small, even if the material scattering pipe section 2 has no inclination angle, the additive auxiliary material falling into the material scattering pipe section 2 can fall into the molten steel under the inertia effect.

Referring to fig. 1, in some possible embodiments, the axis of the spreader pipe section 2 is inclined with respect to the vertical, and the angle of inclination of the spreader pipe section 2 with respect to the vertical is 78 ° to 82 °. Through setting up the inclination of spilling material pipeline section 2, can make and add the auxiliary material and get into the molten steel smoothly.

The oblique arrangement of the spreading pipe section 2 used in this application is only one specific embodiment. Preferably, the angle of inclination of the spreading pipe section 2 with respect to the vertical is 10 °.

Referring to fig. 1 and 5, in some embodiments, the material scattering pipe section 2 is a hollow cone structure with a gradually increasing cross-sectional area, and the small diameter end of the cone structure is communicated with the connecting pipe section 3, and the large diameter end of the cone structure is provided with a discharge hole of the material scattering pipe section 2.

Through setting up to above-mentioned cone structure with spilling material pipeline section 2, can make auxiliary material or alloy be the shape of dispersing from spilling the discharge gate department of material pipeline section 2, impel the unloading by the point and the face, increased the area of contact of auxiliary material with the molten steel, avoid the appearance of ladle top slag caking phenomenon.

Specifically, the cone structure is a conical ring, and the auxiliary materials fall into the molten steel from the conical ring.

In some possible embodiments, the discharge opening of the spreader pipe section 2 extends above the molten steel impact zone of the ladle.

It is understood that, during tapping, a molten steel impact zone is formed due to the flow of molten steel; the discharge hole of the material scattering pipe section 2 extends to the position above the molten steel impact area, so that the contact area of the auxiliary material and the molten steel can be increased, and the agglomeration of the top slag of the steel ladle is avoided. In addition, in the present application, the discharge port of the scattering pipe section 2 is located higher than the molten steel impact region in the vertical direction, and is close to the top surface of the molten steel impact region, but does not contact with the molten steel impact region.

Referring to fig. 1 and 5, the material spreading pipe section 2 is in a semi-cone structure with an open top surface.

Specifically, the structure of the semi-cone may be a frustum structure with a planar top surface, and the cross section along the vertical direction is gradually increased from the connecting pipe section 3 to the free end thereof; alternatively, the half cone structure may be a half cone ring structure with respect to the cone ring.

It should be understood that the temperature above the molten steel is higher, so that the temperature at the discharge outlet of the material scattering pipe section 2 is higher, and therefore, the material scattering pipe section 2 is arranged to be in a semi-cone structure, so that the auxiliary materials can be dispersed under the action of heat waves above the molten steel, and the contact area between the auxiliary materials and the molten steel is favorably enlarged.

For example, the material spreading pipe section 2 may be a full cone structure with an unopened top surface for convenience of processing.

Alternatively, the material scattering pipe section 2 and the connecting pipe section 3 may be welded and fixed, or connected by a screw thread.

Referring to fig. 1, in some possible embodiments, the plurality of sets of connecting pipe segments 3 includes a plurality of first pipe segments 31 and second pipe segments 32; the upper ends of the first pipe sections 31 are respectively communicated with the discharge hole of the upper-stage blanking pipe section 1, and the lower ends of the first pipe sections are respectively communicated with the feed hole of the lower-stage blanking pipe section 1; the upper end of the second pipe section 32 is communicated with the discharge hole of the last-stage blanking pipe section 1, and the lower end is communicated with the material scattering pipe section 2.

The first pipe sections 31 are respectively arranged for realizing the connection between the blanking pipe sections 1; the second pipe section 32 is provided for connecting the blanking pipe section 1 and the scattering pipe section 2.

Optionally, when the total length of the scattering pipe section 2 is long and a full cone structure is adopted, the structure of the second pipe section 32 can be the same as that of the first pipe section 31; when the total length of the material scattering pipe section 2 is short and the semi-cone structure is adopted, the structure of the first pipe section 31 and the second pipe section 32 can be respectively arranged.

Referring to fig. 3, in some embodiments, the first pipe section 31 includes a first infeed section 311, a first transition section 312, and a first outfeed section 313; the upper end of the first feeding section 311 is communicated with the discharge hole of the upper-stage blanking pipe section 1, and the inclination angle of the first feeding section 311 relative to the vertical direction is the same as that of the upper-stage blanking pipe section 1; the first transition section 312 is arranged below the first feeding section 311 and has a first radian in the direction from the upper-stage blanking pipe section 1 to the lower-stage blanking pipe section 1; the upper end of the first discharging section 313 is communicated with the first transition section 312, and the lower end is communicated with the feeding hole of the next-stage discharging pipe section 1; and the inclination angle of the first discharging section 313 along the vertical direction is the same as that of the next-stage discharging pipe section 1.

The first feeding section 311 is used for being connected with the feeding pipe section 1 of the previous stage, and the first discharging section 313 is used for being connected with the feeding pipe section 1 of the next stage; the first transition section 312 is used to realize the connection between the first feeding section 311 and the first discharging section 313. It should be understood that, because the inclination angle between the upper level blanking pipe section 1 and the lower level blanking pipe section 1 is different, through setting up the above-mentioned first radian in this application, the auxiliary material can be smoothly slipped down through the first radian of the first transition section 312, so as to reduce the material jamming phenomenon at the joint.

Optionally, the first feeding section 311 and the feeding pipe section 1 of the previous stage, and the first discharging section 313 and the feeding pipe section 1 of the next stage may be connected together by a threaded connection or a welding fixation.

Referring to fig. 3, for example, a first opening 3121 is formed in a side wall of the first transition section 312, and a first piston 33 adapted to the first opening 3121 is detachably connected to the first opening 3121.

By providing the first opening 3121 and the first piston 33 and making the two detachably connected, the first piston 33 can be conveniently detached to check the internal condition of the first pipe section 31, so that the first pipe section 31 can be dredged through the first opening 3121 in time when a material jamming problem occurs.

Optionally, referring to fig. 1, when the first feeding section 311 and the feeding pipe section 1 of the previous stage and the first discharging section 313 and the feeding pipe section 1 of the next stage are both connected by threads, the first pipe section 31 can be directly disassembled to check the internal condition of the first pipe section 31, and the structure of the first opening 3121 and the first piston 33 is not required.

Referring to fig. 3, for example, one end of the first piston 33 extends into the first transition section 312 and is screwed with the first transition section 312; the end face of the screw-in end of the first piston 33 is a smooth transition surface tangential to the inner wall of the first transition section 312.

By arranging the end face of the screwing end of the first piston 33 as the smooth transition face, the influence of the joint of the first piston 33 and the first opening 3121 on the auxiliary material passing is avoided.

Referring to fig. 4, in some embodiments, the second pipe section 32 includes a second feed section 321 and a second transition section 322; the upper end of the second feeding section 321 is communicated with the discharge hole of the last-stage blanking pipe section 1, and the inclination angle of the second feeding section 321 relative to the vertical direction is the same as that of the last-stage blanking pipe section 1; the second transition section 322 is disposed below the second feeding section 321, and has a second arc degree transitioning from the last stage of the blanking pipe section 1 to the material spreading pipe section 2.

Optionally, the scattering pipe section 2 and the second pipe section 32 are welded and fixed, at this time, because the second pipe section 32 is directly connected with the scattering pipe section 2, the internal condition of the second pipe section 32 can be observed at the discharge port of the scattering pipe section 2, and at this time, the first piston 33 and the first opening 3121 are not required to be arranged.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. Unloading elephant trunk device for set up the top at ladle refining furnace, its characterized in that, unloading elephant trunk device includes:

the multistage blanking pipe sections are arranged at intervals up and down; the axis of each stage of blanking pipe section is obliquely arranged relative to the vertical direction, and the inclination angles of the plurality of stages of blanking pipe sections relative to the vertical direction are sequentially increased from top to bottom; the feed inlet of the blanking pipe section positioned at the top is communicated with the discharge outlet of blanking equipment;

the material spreading pipe section is arranged at the discharge port of the last-stage blanking pipe section, and the discharge port of the material spreading pipe section faces to one side far away from the argon gas inlet of the ladle refining furnace; and

a plurality of groups of connecting pipe sections which are arranged at intervals up and down; every group connect the feed inlet and the last level of pipeline section the discharge gate intercommunication of unloading pipeline section, except that last a set of connect the pipeline section, every group connect the discharge gate and the next level of pipeline section of unloading the feed inlet intercommunication of pipeline section, last a set of connect the discharge gate of pipeline section with spill the feed inlet intercommunication of material pipeline section.

2. The blanking chute apparatus of claim 1 wherein said plurality of stages of blanking tube sections comprise:

the feeding hole of the primary pipe section is communicated with the discharging hole of the blanking equipment, and the inclination angle of the primary pipe section relative to the vertical direction is 8-12 degrees;

the secondary pipe section is positioned below the primary pipe section, and the inclination angle of the secondary pipe section relative to the vertical direction is 38-42 degrees; and

the third-stage pipe section is positioned below the second-stage pipe section, and the inclination angle of the third-stage pipe section relative to the vertical direction is 63-67 degrees;

and a group of connecting pipe sections are respectively connected between the primary pipe section and the secondary pipe section, between the secondary pipe section and the tertiary pipe section and between the tertiary pipe section and the material scattering pipe section.

3. The blanking chute apparatus according to claim 1 or 2, wherein the axis of said spreader pipe section is arranged obliquely with respect to the vertical direction and the angle of inclination of said spreader pipe section with respect to the vertical direction is 78 ° -82 °.

4. The blanking chute device according to claim 3, wherein said spreading pipe section is a hollow cone structure with gradually increasing cross-sectional area, and the small diameter end of said cone structure is communicated with said connecting pipe section, and the large diameter end of said cone structure is provided with a discharge port of said spreading pipe section.

5. The blanking chute apparatus of claim 1 wherein the discharge outlet of said spreader pipe section extends above the molten steel impact zone of the ladle.

6. The blanking chute apparatus of claim 1 wherein said plurality of sets of said connecting tube segments comprise:

the upper ends of the first pipe sections are respectively communicated with the discharge hole of the feeding pipe section at the upper stage, and the lower ends of the first pipe sections are respectively communicated with the feed hole of the feeding pipe section at the lower stage;

and the upper end of the second pipe section is communicated with the discharge hole of the last-stage blanking pipe section, and the lower end of the second pipe section is communicated with the material scattering pipe section.

7. The blanking chute apparatus of claim 6 wherein said first pipe section comprises:

the upper end of the first feeding section is communicated with the discharge hole of the feeding pipe section at the upper stage, and the inclination angle of the first feeding section relative to the vertical direction is the same as that of the feeding pipe section at the upper stage;

the first transition section is arranged below the first feeding section and provided with a first radian for transition from the feeding pipe section at the upper stage to the feeding pipe section at the lower stage; and

the upper end of the first discharging section is communicated with the first transition section, and the lower end of the first discharging section is communicated with a feeding hole of the next-stage discharging pipe section; and the inclination angle of the first discharging section relative to the vertical direction is the same as that of the next-stage discharging pipe section.

8. The blanking chute device as claimed in claim 7, wherein a first opening is provided on the side wall of said first transition section, and a first piston adapted to said first opening is detachably connected to said first opening.

9. The blanking chute apparatus of claim 8, wherein one end of said first piston extends into said first transition section and is screw-connected to said first transition section; the end face of the screwing end of the first piston is a smooth transition face tangent to the inner wall of the first transition section.

10. The blanking chute apparatus of claim 6 wherein said second pipe section comprises:

the upper end of the second feeding section is communicated with the discharge hole of the last-stage blanking pipe section, and the inclination angle of the second feeding section relative to the vertical direction is the same as that of the last-stage blanking pipe section; and

and the second transition section is arranged below the second feeding section and has a second radian in the direction from the last stage of the blanking pipe section to the material scattering pipe section.

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