Dust collecting device for molten iron spheroidizing and using method

Abstract

The invention relates to a dust collecting device for molten iron spheroidizing and a using method, and the dust collecting device comprises a ladle body which is a container for storing molten iron and carrying out spheroidizing reaction; the bag body can be horizontally placed and is turned over along one side to be in a vertical state; covering an opening; the overturning assembly is a device for driving the ladle body to realize a horizontal or vertical state; a translation track; the dust collecting cover is a cover body which is closed on four sides or three sides and is opened towards one side of the bag opening; a driver is arranged on the lower side of the dust collection cover and can move to the upper side of the bag body by virtue of the translation track; a top cover; the telescopic channel is a pipeline with the changeable length, one end of the telescopic channel is fixedly connected with the top cover, the other end of the telescopic channel is externally connected with a dust collecting system, negative pressure is generated in the top cover, and smoke generated in the balling reaction in the ladle body is collected. And the synchronous tracking and collection of the overflowing flue gas are realized.

Description

Technical Field

[0001] The invention belongs to the technical field of metallurgical environmental protection, and particularly relates to a dust collecting device for molten iron pelletizing and a use method thereof. Background Art

[0002] Molten iron spheroidization is a metallurgical treatment process that converts flake graphite in cast iron into spheroidal graphite by adding specific spheroidizing agents (such as magnesium, rare earth or magnesium alloys) to the molten iron. This process significantly improves the mechanical properties of cast iron. Common spheroidization methods include: wire feeding method, punching method, pressure magnesium method, in-mold method, subcontracting method, covering method, etc. In the development of existing technologies, the applicant has also developed a magnesium spraying method, a covering pressure method and a cave-type punching method. For example, the applicant's prior application CN202210134817.2 A pressure-added magnesium covering clamping device, CN202010454599.1 A device and method for improving the absorption rate of sprayed granular spheroidizing agents, CN202111627994.6 A pressurized spheroidization device and method, etc., are all new spheroidization methods developed by the applicant in the study of existing technologies. However, regardless of the method, a violent reaction occurs when the spheroidizing agent comes into contact with molten iron at around 1450 degrees Celsius, causing splashing of the molten iron and the spread of smoke and dust. Under current environmental protection requirements, the simple spheroidization reaction can effectively meet the environmental needs of the site.

[0003] In studying the existing technology, the inventors found that in a specific environment, if the spheroidization process described above is not adopted, a new spheroidization method needs to be designed. At the same time, a synchronous dust collection device needs to be adapted on the basis of this new spheroidization method to avoid the overflow of smoke and dust and the impact of molten iron splashing on the dust collection system.

[0004] Therefore, there is an urgent need for a dust collecting device for molten iron spheroidization to overcome the existing technical problems existing in the spheroidization reaction. Summary of the Invention

[0005] In order to overcome the problems in the existing technology, the inventors adopted a spheroidization process derived from the wire feeding method and the flushing method. A container similar to a transfer bag or a lying bag is used to add a spheroidizing agent into the container, and a special turning component is designed to achieve mixing of the added spheroidizing agent in the molten iron. At the same time, the smoke is discharged from the molten iron inlet, and the dust collection system is used to collect the smoke. In addition, during the turning of the bag and the mixing of the molten iron, a splash outlet is blocked to avoid affecting the dust collection system. The technical solution adopted by the present invention is: a dust collection device for molten iron spheroidization, comprising:

[0006] The ladle is a container for storing the molten iron and performing the spheroidization reaction; the ladle can be placed horizontally and flipped along one side to a vertical state;

[0007] Ladle mouth, which is the entrance for the molten iron to enter the ladle;

[0008] The bag opening is located on the other side of the flipping axis when the bag body is flipped;

[0009] The opening surface of the bag mouth is parallel to the top surface of the bag body in a horizontal position, or is located separately on the other side of the bag mouth when the bag body is flipped over, and is tilted downward when the bag body is in a horizontal position;

[0010] The spheroidizing agent required for the spheroidization reaction enters the package through the package opening.

[0011] Alternatively, an openable and closable channel is provided on the package body, and the spheroidizing agent is placed before the spheroidization reaction and then closed;

[0012] A turning assembly is a device for driving the package body to achieve a horizontal or vertical state;

[0013] The translation track is a horizontal track located on the side of the package;

[0014] The dust collecting hood is a hood body that is closed on four sides or three sides and is open toward the bag opening; a drive is provided on the lower side of the dust collecting hood, which can move to the upper side of the bag body by means of the translation track;

[0015] A top cover is located at the top of the dust collecting hood and is fixedly connected to the dust collecting hood;

[0016] The telescopic passage is a pipe with variable length, one end of which is fixedly connected to the top cover and the other end of which is an external dust collecting system, so as to generate negative pressure inside the top cover and collect the smoke generated during the spheroidization reaction inside the package.

[0017] Further,

[0018] After the spheroidizing agent enters the ladle through the ladle opening, in order to achieve sufficient reaction between the spheroidizing agent and the molten iron, the turning assembly drives the ladle to turn from a horizontal state to a vertical state, or repeatedly switch between the horizontal and vertical states;

[0019] The dust collecting hood moves with the help of the translation track so that the bag opening is always located at the lower side of the top cover.

[0020] Further,

[0021] When the dust collecting hood is closed on three sides and is open toward the bag opening, a plurality of curtains are provided on the open side.

[0022] Furthermore, the telescopic passage includes:

[0023] an inner tube, one end of which is fixedly connected to the top cover;

[0024] An outer tube, one end of which is connected to the dust collection system, and the other end of which is sleeved with the inner tube;

[0025] The bracket is a frame that supports the outer tube in a horizontal direction;

[0026] The inner tube and the outer tube form a closed passage in the form of pulling and reciprocating motion with the dust collecting hood.

[0027] Furthermore, the telescopic passage further comprises:

[0028] A wheel groove is fixedly connected to the outer tube and is open toward the inner tube;

[0029] A fixed frame, a frame body fixed in the wheel groove;

[0030] The pulley is connected to the fixing frame and contacts the outer wall of the inner tube to reduce the sliding friction when the inner tube and the outer tube move relative to each other.

[0031] Further,

[0032] The wheel groove protrudes from the outer wall of the outer tube, so that the rotating shaft of the pulley is located outside the outer wall of the outer tube.

[0033] Further,

[0034] The pulleys are arranged at least two on the circumference of the outer tube to support the inner tube and the outer tube to maintain clearance fit.

[0035] Furthermore, the dust collecting hood further comprises:

[0036] The connecting frame is a frame located inside the dust collecting hood;

[0037] a baffle, fixed on the connecting frame;

[0038] When the ladle is flipped from a horizontal state to a vertical state by means of the flip assembly, the baffle is opposite to the ladle opening, preventing the molten iron from splashing and the temperature from dissipating during the spheroidization reaction.

[0039] Further,

[0040] The elevation of the overturning assembly is lower than that of the translation track, so that the package is located in the pit when in a horizontal state.

[0041] And, a method for using a dust collecting device for molten iron pelletizing,

[0042] The invention comprises the above-mentioned dust collecting device for molten iron balling, and the following method:

[0043] The dust collecting hood is located away from the flip assembly;

[0044] The molten iron to be spheroidized is stored in the ladle and is transported to the turning assembly in a horizontal state;

[0045] adding a spheroidizing agent from the bag opening;

[0046] The dust collecting hood moves to the upper side of the bag opening, or after the bag body is flipped to a vertical state by the flip assembly, the dust collecting hood moves to the upper side of the bag opening.

[0047] The bag body is reciprocated between the horizontal and vertical states by means of the flip assembly, and the dust collecting hood is synchronously changed along with the position of the bag opening;

[0048] After the spheroidization reaction is completed, the dust collecting hood is moved away from the package, and the package is transported out.

[0049] The beneficial effects of the present invention compared to the prior art are:

[0050] 1. Based on the proposal of a new spheroidization process, a dust collection system for the spheroidization reaction process was designed simultaneously;

[0051] 2. The movable dust collection hood can realize the synchronous tracking and collection of the overflowing smoke;

[0052] 3. The flipping component realizes the mixing between the added spheroidizing agent and the molten iron to be spheroidized, and simultaneously adopts the flipping form to prevent the flue gas from escaping from the range of the dust collection system;

[0053] 4. The clearance between the inner tube and the outer tube forms a new passage, which avoids the burning and impact of splashing molten iron on the traditional flexible dust collection system.

[0054] 5. The rotating shaft of the pulley is located outside the outer tube to avoid the influence of smoke or dust on the sliding device.

[0055] 6. Based on this dust collection system, a dust extraction method is proposed. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 It is a front view of a specific embodiment of the present invention;

[0057] Figure 2 This is a view of the vertical / upright state of the inclusion during the spheroidization reaction process according to a specific embodiment of the present invention;

[0058] Figure 3 This is a view of the inclusion in a horizontal / lying state during the spheroidization reaction process according to a specific embodiment of the present invention;

[0059] Figure 4 A schematic diagram of a package body according to a specific embodiment of the present invention;

[0060] Figure 5 It is a cross-sectional view taken along line AA of a specific embodiment of the present invention;

[0061] Figure 6 It is a cross-sectional view taken along line BB of a specific embodiment of the present invention;

[0062] Figure 7 This is a cross-sectional view of a telescopic passage according to a specific embodiment of the present invention;

[0063] Figure 8 A view of a support according to a specific embodiment of the present invention;

[0064] The annotations are:

[0065] 100-package body; 110-package opening;

[0066] 200-Flip assembly;

[0067] 300-dust hood; 310-translation track; 320-top cover; 330-curtain;

[0068] 400 - telescopic passage; 410 - bracket; 420 - inner tube; 430 - outer tube; 440 - pulley; 441 - wheel groove; 442 - fixed frame;

[0069] 500-connecting frame; 510-baffle. DETAILED DESCRIPTION

[0070] The technical solutions in the embodiments are clearly and completely described. Obviously, the embodiments described are only a part of the embodiments of the present invention, rather than all the embodiments. In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present invention.

[0071] In order to overcome the problems in the prior art, the inventors adopted a spheroidizing process derived from the wire feeding method and the flushing method. A container similar to a transfer bag or a lying bag is used to add a spheroidizing agent into the container, and a special flipping component is designed to achieve the mixing of the added spheroidizing agent in the molten iron. At the same time, the flue gas is discharged from the molten iron inlet, and the dust collection system is used to collect the flue gas. In addition, during the flipping of the bag and the mixing of the molten iron, a splash outlet is blocked to avoid affecting the dust collection system.

[0072] See also Figures 1 to 8 The technical solution adopted in this specific embodiment is: a dust collecting device for molten iron balling, comprising:

[0073] The ladle 100 is a container for storing the molten iron and performing the spheroidization reaction; the ladle 100 can be placed horizontally and flipped along one side to a vertical state;

[0074] See also Figure 1 and Figure 2 It should be noted that while the ladle body 100 is defined as being horizontal or vertical, this should not be construed as simply being at an angle of 0 or 90 degrees relative to a plane. Under the inventive concept of this embodiment, a certain angle, i.e., a state that is not completely vertical or horizontal, is also within the scope of this embodiment. In some embodiments, the ladle mouth 110 may be slightly raised, or slightly tilted when in a vertical state, and these should all be understood as being in a horizontal or vertical state. The inventive concept is to achieve thorough mixing of the spheroidizing agent and molten iron by switching between these states.

[0075] The ladle opening 110 is the entrance for the molten iron to enter the ladle body 100;

[0076] The bag opening 110 is located on the other side of the flip axis when the bag body 100 is flipped; Figure 1 and Figure 2 The two states can be understood as the flipping of the package body 100 and the flipping of the package mouth 110.

[0077] The opening surface of the bag opening 110 is parallel to the top surface of the bag body 100 when it is placed horizontally, or is located separately on the other side of the bag opening 110 when it is flipped relative to the bag body 100, and is tilted downward when the bag body 100 is in a horizontal state; Figure 4 , showing the structure of a ladle 100. It should be noted that the ladle mouth 110 is the inlet for molten iron. Although it can be tilted, its tilt angle cannot be too large to ensure the storage of molten iron.

[0078] The spheroidizing agent required for the spheroidization reaction enters the package body 100 through the package opening 110.

[0079] Alternatively, an openable and closable channel is provided on the package 100, and the spheroidizing agent is placed before the spheroidization reaction and then closed;

[0080] See also Figure 4 , provides two methods of adding the spheroidizing agent, one is to add it at the bag opening 110, and the other is to add it through a closable channel provided on the bag body 100, for example Figure 4On the right side, an upward, openable channel is provided to allow for the addition of spheroidizing agent. Both configurations can achieve spheroidization, differing only in the ease of operation. Initial spheroidizing agent loss also varies. Adding the agent at the tail end allows for a rapid transition to a vertical position, allowing the spheroidizing agent to mix with the molten iron during the upward and reaction process, thereby improving spheroidization efficiency. However, the tail end opening naturally increases the equipment requirements.

[0081] The flip assembly 200 is a device for driving the bag body 100 to achieve a horizontal or vertical state;

[0082] The translation track 310 is a horizontal track located on the side of the bag body 100 ; the function of the translation track 310 is to allow the dust collecting hood 300 to reciprocate on the plane on which the bag body 100 is turned.

[0083] The dust collecting hood 300 is a hood body that is closed on four sides or three sides and is open to the bag opening 110. The lower side of the dust collecting hood 300 is provided with a drive that can move to the upper side of the bag body 100 by means of the translation track 310. Figure 5 The dust collecting hood 300 is closed on three sides. Of course, in other embodiments, as long as it does not affect the turning, it can also be combined with the top cover 320 to form a bell-shaped hood, with one side open for easy observation and four sides closed for easy dust collection. Both structures have advantages.

[0084] The top cover 320 is located at the top of the dust collecting hood 300 and is fixedly connected to the dust collecting hood 300;

[0085] Telescopic passage 400 is a variable-length pipe with one end fixedly connected to the top cover 320 and the other end connected to an external dust collection system. This creates a negative pressure within the top cover 320 and collects the fumes generated during the spheroidization reaction within the cladding 100. The external dust collection system provides negative pressure. This embodiment only illustrates the front end of the dust collection process, not the back end. However, those skilled in the art will readily understand the overall system structure and dust collection implementation.

[0086] In other embodiments, see Figures 2 to 3 In order to improve the dust collection effect, the dust collecting hood 300 can track the position of the bag opening 110 to improve the dust collection effect.

[0087] After the spheroidizing agent enters the ladle body 100 through the ladle opening 110, the turning assembly 200 drives the ladle body 100 to turn from a horizontal state to a vertical state, or repeatedly switch between the horizontal and vertical states, in order to achieve a sufficient reaction between the spheroidizing agent and the molten iron.

[0088] The dust collecting hood 300 moves with the aid of the translation track 310 so that the bag opening 110 is always located at the lower side of the top cover 320 .

[0089] In other embodiments, see Figure 5 In order to further improve the dust collection effect,

[0090] When the dust collecting hood 300 is closed on three sides and is open toward the bag opening 110 , a plurality of curtains 330 are provided on the open side;

[0091] In other embodiments, see Figure 1 、 Figure 7 , a passage adapted for collecting dust during the spheroidization process is proposed, the telescopic passage 400 includes:

[0092] An inner tube 420, one end of which is fixedly connected to the top cover 320;

[0093] The outer tube 430 has one end connected to the dust collection system and the other end is fitted with the inner tube 420;

[0094] The bracket 410 is a frame that supports the outer tube 430 in a horizontal direction;

[0095] The inner tube 420 and outer tube 430 are pulled together to form a closed passageway, synchronizing with the reciprocating motion of the dust hood 300. Compared to conventional flexible passageways, the rigid tubular structure can better withstand the influence of complex environments. However, it should be noted that the tubular structure does not necessarily have a circular cross-section; it can also be rectangular or other polygonal structures.

[0096] In other embodiments, in order to improve the overall mobility of the device, the telescopic passage 400 further includes:

[0097] The wheel groove 441 is fixedly connected to the outer tube 430 and is open toward the inner tube 420;

[0098] A fixed frame 442, a frame fixed in the wheel groove 441;

[0099] The pulley 440 is connected to the fixing frame 442 and contacts the outer wall of the inner tube 420 to reduce the sliding friction when the inner tube 420 and the outer tube 430 move relative to each other.

[0100] In another embodiment, the inventors found that smoke has a great impact on the service life of the pulley 440. In order to reduce the contact between the pulley 440 and the smoke,

[0101] The wheel groove 441 protrudes from the outer wall of the outer tube 430 , so that the rotation axis of the pulley 440 is located outside the outer wall of the outer tube 430 .

[0102] In some embodiments, preferably your,

[0103] The pulleys 440 are provided at least two on the circumference of the outer tube 430 to support the inner tube 420 and the outer tube 430 to maintain a clearance fit.

[0104] In other embodiments, see Figure 6 In order to reduce the impact of splashing molten iron on the overall dust collection system and to reduce the rapid loss of molten iron temperature during the reaction of distance in the spheroidization process by blocking, the dust collection cover 300 also includes:

[0105] The connecting frame 500 is a frame located inside the dust collecting hood 300;

[0106] The baffle 510 is fixed on the connecting frame 500;

[0107] When the ladle body 100 is flipped from a horizontal state to a vertical state by means of the flip assembly 200 , the baffle 510 is opposite to the ladle opening 110 , preventing the molten iron from splashing and the temperature from dissipating during the spheroidization reaction.

[0108] In some embodiments, due to the severity of the spheroidization reaction, in order to improve safety and reduce the height requirement of the dust hood 300 due to the package 100, preferably,

[0109] The elevation of the flip assembly 200 is lower than the translation track 310, so that the bag body 100 is located in the pit when it is in a horizontal state. It should be noted that the pit described in this embodiment is to lower the height of the bag body 100 in a horizontal position to form a state below zero. It is emphasized that the elevation height is the elevation position of the lowest surface of the equipment, which does not mean that the equipment as a whole must be lower than another equipment. The purpose of this technical measure is to improve safety and reduce the height of the dust hood 300. Of course, on the contrary, if the depth of the pit is too large, it will also affect the difficulty of the bag body 100 entering the work station.

[0110] Based on the above device, a method for using a dust collecting device for molten iron balling is proposed.

[0111] The invention comprises the dust collecting device for molten iron balling described in the above embodiment, and the following method:

[0112] The dust collecting hood 300 is located away from the flip assembly 200;

[0113] The ladle 100 contains molten iron to be spheroidized and is transported to the turnover assembly 200 in a horizontal state;

[0114] Adding a spheroidizing agent from the bag opening 110;

[0115] The dust collecting hood 300 moves to the upper side of the bag opening 110, or after the bag body 100 is flipped to a vertical state by the flip assembly 200, the dust collecting hood 300 moves to the upper side of the bag opening 110.

[0116] The bag body 100 is reciprocated between the horizontal and vertical states by means of the flip assembly 200, and the dust collecting hood 300 is synchronized with the position change of the bag opening 110.

[0117] After the spheroidization reaction is completed, the dust collecting hood 300 is moved away from the enclosure 100 and the enclosure 100 is transported out.

[0118] During specific implementation: the ladle 100 is in a horizontal state, with the ladle opening 110 facing upward, molten iron is added, the ladle 100 moves to the spheroidizing position, and the ladle 100 sits on the flip assembly 200 and cooperates with it. A spheroidizing agent, which can generally be a magnesium block, is added to the ladle opening 110 or the openable and closable channel on the ladle 100. At this time, the molten iron reacts with the spheroidizing agent, and the dust collecting hood 300 moves to the upper end of the ladle opening 110 to collect dust with the help of negative pressure. The flip assembly 200 flips the ladle 100 to a vertical or upright state. Due to the change in the position of the ladle 100 or the disturbance of the molten iron, the spheroidizing agent and the molten iron are mixed. At this time, the molten iron and the spheroidizing agent react violently, and a large amount of smoke and molten iron are splashed. The splashing molten iron will be blocked by the baffle 510 to protect the dust collection system. At the same time, the ladle opening 110 is closer to the top cover 320, and the negative pressure for collecting smoke is greater, which can more effectively collect smoke and meet environmental protection requirements. In other operations, the above steps can be repeated, with the turning assembly 200 making the bag body 100 horizontal, and the dust collecting hood 300 moving to the upper side of the bag opening 110 to collect the flue gas. The dust collecting hood 300 can be turned back and forth to achieve a sufficient spheroidization reaction.

[0119] The beneficial effects of the present invention compared to the prior art are:

[0120] 1. Based on the proposal of a new spheroidization process, a dust collection system for the spheroidization reaction process was designed simultaneously;

[0121] 2. The movable dust collection hood can realize the synchronous tracking and collection of the overflowing smoke;

[0122] 3. The flipping component realizes the mixing between the added spheroidizing agent and the molten iron to be spheroidized, and simultaneously adopts the flipping form to prevent the flue gas from escaping from the range of the dust collection system;

[0123] 4. The clearance between the inner tube and the outer tube forms a new passage, which avoids the burning and impact of splashing molten iron on the traditional flexible dust collection system.

[0124] 5. The rotating shaft of the pulley is located outside the outer tube to avoid the influence of smoke or dust on the sliding device.

[0125] 6. Based on this dust collection system, a dust extraction method is proposed.

[0126] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A dust collecting device for molten iron balling, characterized in that: include: The ladle (100) is a container for storing the molten iron and performing the spheroidization reaction; The bag body (100) can be placed horizontally and flipped along one side to a vertical state; a ladle opening (110), which is an entrance for the molten iron to enter the ladle body (100); The bag opening (110) is located on the other side of the flip axis when the bag body (100) is flipped; The opening surface of the bag mouth (110) is parallel to the top surface of the bag body (100) when it is placed horizontally, or is located separately on the other side of the bag mouth (110) when it is flipped relative to the bag body (100), and is tilted downward when the bag body (100) is in a horizontal state; The spheroidizing agent required for the spheroidization reaction enters the package body (100) through the package opening (110). Alternatively, an openable and closable channel is provided on the package (100), and the spheroidizing agent is placed before the spheroidizing reaction and then closed; A turning assembly (200) is a device for driving the bag body (100) to achieve a horizontal or vertical state; A translation track (310) is a horizontal track located on the side of the package body (100); The dust collecting hood (300) is a hood body that is closed on four sides or three sides and is open toward the bag opening (110); a drive is provided on the lower side of the dust collecting hood (300) so as to be able to move to the upper side of the bag body (100) by means of the translation track (310); A top cover (320) is located at the top of the dust collecting hood (300) and is fixedly connected to the dust collecting hood (300); The telescopic passage (400) is a pipe with variable length, one end of which is fixedly connected to the top cover (320) and the other end of which is connected to an external dust collecting system, so as to generate negative pressure in the top cover (320) and collect the smoke generated during the spheroidization reaction in the package (100).

2. The dust collecting device for molten iron balling according to claim 1, characterized in that: After the spheroidizing agent enters the ladle (100) through the ladle opening (110), in order to achieve a sufficient reaction between the spheroidizing agent and the molten iron, the turning assembly (200) drives the ladle (100) to turn from a horizontal state to a vertical state, or repeatedly switch between the horizontal and vertical states; The dust collecting hood (300) moves with the aid of the translation track (310), so that the bag opening (110) is always located at the lower side of the top cover (320).

3. The dust collecting device for molten iron balling according to claim 1, characterized in that: When the dust collecting hood (300) is closed on three sides and is open toward the bag opening (110), a plurality of barrier curtains (330) are provided on the open side.

4. The dust collecting device for molten iron balling according to claim 1, characterized in that: The telescopic passage (400) comprises: An inner tube (420), one end of which is fixedly connected to the top cover (320); An outer tube (430), one end of which is connected to the dust collecting system, and the other end of which is sheathed with the inner tube (420); The bracket (410) is a frame body that supports the outer tube (430) in a horizontal direction; The inner tube (420) and the outer tube (430) form a closed passage in a pulling manner and cooperate with the dust collecting hood (300) to reciprocate.

5. The dust collecting device for molten iron balling according to claim 4, characterized in that: The telescopic passage (400) further comprises: A wheel groove (441) is fixedly connected to the outer tube (430) and has an opening toward the inner tube (420); A fixed frame (442) fixed to the frame body in the wheel groove (441); The pulley (440) is connected to the fixing frame (442) and contacts the outer wall of the inner tube (420) to reduce the sliding friction force when the inner tube (420) and the outer tube (430) move relative to each other.

6. The dust collecting device for molten iron balling according to claim 5, characterized in that: The wheel groove (441) protrudes from the outer wall of the outer tube (430), so that the rotating shaft of the pulley (440) is located outside the outer wall of the outer tube (430).

7. The dust collecting device for molten iron balling according to claim 5, characterized in that: The pulleys (440) are provided in a number of two or more on the circumference of the outer tube (430) to support the inner tube (420) and the outer tube (430) to maintain clearance fit.

8. The dust collecting device for molten iron balling according to claim 1, characterized in that: The dust collecting hood (300) further comprises: A connecting frame (500) is a frame located inside the dust collecting hood (300); a baffle (510) fixed on the connecting frame (500); When the ladle (100) is flipped from a horizontal state to a vertical state by means of the flip assembly (200), the baffle (510) is opposite to the ladle opening (110), preventing the splashing of molten iron and the loss of temperature during the spheroidization reaction.

9. The dust collecting device for molten iron balling according to claim 1, characterized in that: The tilting assembly (200) is at a lower elevation than the translation track (310), so that the package (100) is located in the pit when in a horizontal state.

10. A method for using a dust collecting device for molten iron balling, characterized in that: The invention comprises the dust collecting device for molten iron balling according to any one of claims 1 to 9, and the following method: The dust collecting hood (300) is located away from the flip assembly (200); The molten iron to be spheroidized is stored in the ladle (100) and is transported to the turning assembly (200) in a horizontal state; Adding a spheroidizing agent from the bag opening (110); The dust collecting hood (300) moves to the upper side of the bag opening (110), or after the bag body (100) is flipped to a vertical state by means of the flip assembly (200), the dust collecting hood (300) moves to the upper side of the bag opening (110). The bag body (100) is reciprocated between a horizontal state and a vertical state by means of the flip assembly (200), and the dust collecting hood (300) is synchronized to always change with the position of the bag opening (110); After the spheroidization reaction is completed, the dust collecting hood (300) is moved away from the enclosure (100), and the enclosure (100) is transported out.

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