Inoculation treatment device for nodular cast iron and casting method of nodular cast iron

Abstract

The embodiment of the invention provides a nodular cast iron inoculation treatment device and a casting method thereof, and relates to the technical field of nodular cast iron production. The device comprises a casting ladle, a base, a stand column, a cross beam, a stirring frame, a lifting assembly and a driving assembly, the stand column is vertically arranged on the base, the cross beam is horizontally arranged at the top end of the stand column, the stirring frame is arranged at the end, away from the stand column, of the cross beam, and the stirring frame vertically extends downwards; the driving assembly is arranged on the cross beam and connected with the stirring frame, the driving assembly is used for driving the stirring frame to rotate, the stirring frame is provided with a containing cavity used for storing inoculants, and the lifting assembly is arranged on the stand column and connected with the cross beam. The lifting assembly is used for driving the cross beam to move in the vertical direction. The method has the effect of improving the quality of finished nodular cast iron.

Description

Technical Field

[0001] This invention relates to the field of ductile iron production technology, and more specifically, to an inoculation treatment apparatus and casting method for ductile iron. Background Technology

[0002] Ductile iron is a cast iron material with high strength, high toughness, and good wear resistance. Compared with ordinary gray cast iron, the carbon in ductile iron mainly exists in the form of spheroidal graphite, which significantly improves the mechanical properties of ductile iron. During the production of ductile iron, spheroidizing and inoculation treatments promote the formation of graphite spheres. Spheroidizing agents (such as magnesium and rare earth elements) cause carbon in the molten iron to precipitate in the form of spheroidal graphite, while inoculants (such as silicon, barium, and calcium) help nucleate and grow graphite spheres, controlling their number and size.

[0003] Traditional ductile iron inoculation generally adopts ladle inoculation, that is, when using the pouring method for spheroidization, the inoculant is completely covered on the spheroidizing agent at the bottom of the spheroidization pit in the ladle, and the inoculation effect occurs simultaneously when the molten iron is poured in for spheroidization treatment.

[0004] During inoculation in the ladle, the molten iron poured into the ladle first reacts with the inoculant. The reaction time and concentration of the molten iron poured into the ladle at different times and with the inoculant are different, resulting in uneven reaction between the molten iron and the inoculant. This affects the uniformity of the texture of the finished ductile iron and thus the quality of the finished ductile iron. Summary of the Invention

[0005] The present invention aims to provide an inoculation treatment apparatus and a casting method for ductile iron, which can improve the quality of the finished ductile iron.

[0006] The embodiments of the present invention can be implemented as follows: On one hand, this application provides an inoculation treatment device for ductile iron, which includes a ladle, a base, a column, a crossbeam, a stirring frame, a lifting assembly, and a driving assembly. The column is vertically arranged on the base, the crossbeam is horizontally arranged at the top of the column, the stirring frame is arranged at the end of the crossbeam away from the column, and the stirring frame extends vertically downward. The driving assembly is arranged on the crossbeam and connected to the stirring frame. The driving assembly is used to drive the stirring frame to rotate. The stirring frame has a accommodating cavity for storing an inoculant. The lifting assembly is arranged on the column and connected to the crossbeam. The lifting assembly is used to drive the crossbeam to move in the vertical direction.

[0007] Optionally, the stirring frame includes a connecting rod, a guide rod, a telescopic rod, a stirring rod, and an adjusting component. The connecting rod is vertically mounted on the drive assembly. The guide rod is horizontally connected to one end of the connecting rod near the crossbeam. The telescopic rod is horizontally connected to the end of the connecting rod away from the crossbeam. The stirring rod is vertically connected to both ends of the telescopic rod. The other end of the stirring rod extends toward the guide rod and is movably connected to the guide rod. The adjusting component is mounted on the guide rod and connected to the two stirring rods. The adjusting component is used to drive the two guide rods closer to or further apart from each other.

[0008] Optionally, the telescopic rod includes a piston rod and a sleeve rod. The piston rod is connected to the connecting rod, and the sleeve rod is slidably sleeved on both ends of the piston rod. The two stirring rods are respectively connected to the opposite ends of the two sleeve rods.

[0009] Optionally, the accommodating cavity is opened along the length direction of the stirring rod, and filter screens for enclosing the accommodating cavity are provided on both sides of the stirring rod.

[0010] Optionally, the adjusting component includes a bidirectional motor and a bidirectional lead screw. A guide groove is provided on the guide rod along the length direction of the guide rod. The bidirectional lead screw is rotatably mounted on the guide rod and located in the guide groove. Both stirring rods are slidably connected to the guide groove, and the two stirring rods are respectively threaded onto both ends of the bidirectional lead screw. The bidirectional motor is located at one end of the guide rod and coaxially connected to the bidirectional lead screw.

[0011] Optionally, scrapers are provided on the sides of the two stirring rods that are far apart from each other.

[0012] Optionally, the drive assembly includes a drive motor, which is mounted on the crossbeam. The output shaft of the drive motor rotates vertically through the crossbeam and connects to the stirring frame.

[0013] Optionally, the base is provided with multiple self-locking casters at its bottom.

[0014] Optionally, the lifting assembly includes a lifting cylinder, the column includes a receiving section and an adjusting section, the adjusting section is slidably disposed within the receiving section, the lifting cylinder is disposed within the receiving section, the lifting cylinder extends along the length direction of the receiving section and is connected to the adjusting section.

[0015] On the other hand, this application provides a method for casting ductile iron, including the following steps: placing the inoculant to be added into the receiving cavity on the stirring rack; Move the base so that the mixing rack is directly opposite the ladle, and use the lifting assembly to drive the crossbeam to descend, so that the mixing rack moves into the ladle and the inoculant is added to the molten iron. The stirring frame is driven by the drive component to rotate, which stirs the molten iron in the ladle, so that the inoculant and molten iron are fully mixed and reacted. After the inoculant has fully reacted, the stirring rack is moved outside the ladle to pour the molten iron into the casting mold for casting.

[0016] The beneficial effects of the inoculation treatment apparatus and casting method for ductile iron provided in this embodiment of the invention include: When inoculating ductile iron, the molten iron to be processed is placed in a ladle, and the inoculant is placed in the receiving cavity on the stirring frame. Then, the stirring frame is driven to move downward into the ladle by the lifting component, and the stirring frame is driven to rotate by the driving component. The molten iron reacts with the inoculant in the stirring frame, and at the same time, the stirring frame stirs the molten iron, so that the molten iron and the inoculant react fully and evenly, thereby making the finished cast iron uniform in texture and improving the quality of the finished cast iron. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the inoculation treatment device for ductile iron provided in this embodiment; Figure 2 This is a schematic diagram of the structure of the stirring rack provided in this embodiment; Figure 3 This is a partial cross-sectional view of the inoculation treatment apparatus for ductile iron provided in this embodiment.

[0019] Icons: 100, Base; 110, Self-locking caster wheel; 200, Column; 210, Receiving section; 220, Adjustable section; 300, Crossbeam; 400, Stirring rack; 410, Connecting rod; 420, Guide rod; 421, Guide groove; 430, Telescopic rod; 431, Piston rod; 432, Sleeve rod; 440, Stirring rod; 441, Scraper; 450, Adjusting component; 451, Bidirectional motor; 452, Bidirectional lead screw; 500, Lifting assembly; 510, Lifting cylinder; 600, Drive assembly; 610, Drive motor; 700, Receiving cavity; 710, Filter screen. Detailed Implementation

[0020] Currently, the most common method for inoculating ductile iron is the pouring method, which is the most widely used spheroidizing process both domestically and internationally. The original molten iron temperature must be greater than or equal to 1450℃, and the sulfur mass fraction should be less than 0.1%. Rare earth ferrosilicon magnesium spheroidizing agents are generally used. Furthermore, the ratio of the depth to the inner diameter of the spheroidizing ladle should be greater than 1.5, the pit area of ​​the ladle should occupy 2 / 5-1 / 2 of the ladle bottom area, and the spheroidizing temperature should be between 1400℃ and 1430℃. During treatment, the molten iron is poured towards the side of the ladle without the spheroidizing agent, ensuring that the ladle is filled to its maximum capacity in one go. After the spheroidizing agent has reacted completely, perlite is applied to the surface of the molten iron, the slag is skimmed off, and perlite is added again, repeating this process 2-3 times. The advantages of this process are its ease of operation and ability to achieve stable production. The disadvantage is the relatively low magnesium absorption rate; therefore, the pouring method remains the main method for spheroidizing treatment in China.

[0021] When using the pouring method for spheroidizing, the inoculant is completely placed on top of the spheroidizing agent at the bottom of the spheroidizing pit in the ladle. Inoculation occurs simultaneously with the pouring of molten iron for spheroidizing. However, each inoculation requires manual addition of both the spheroidizing agent and the inoculant to the ladle, which is time-consuming and inefficient. Furthermore, because the inoculant is located at the bottom of the ladle, it reacts first with the poured molten iron and then gradually with subsequently poured molten iron. This results in inconsistent reaction times and concentrations of the inoculant with molten iron poured into the ladle at different times, leading to uneven casting quality and affecting the final casting quality.

[0022] To address the aforementioned problems, this invention provides an inoculation treatment apparatus and casting method for ductile iron, which enables the inoculant to fully mix and react with the molten iron in the ladle, thereby improving the problem of uneven reaction between the molten iron and the inoculant and enhancing the quality of the final casting.

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0025] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0026] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0027] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0028] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0029] The following detailed description, through embodiments and in conjunction with the accompanying drawings, details the overall structure, working principle, and technical effects of the inoculation treatment device for ductile iron provided by the present invention, as well as the detailed steps, implementation principles, and technical effects of the supporting ductile iron casting method.

[0030] Please refer to Figure 1 and Figure 2 This invention provides an inoculation treatment device for ductile iron, applied to the inoculation process in ductile iron production. Specifically, it includes a ladle (not shown in the accompanying drawings), a commonly used ladle structure in ductile iron production. It also includes a base 100, a column 200, a crossbeam 300, a stirring rack 400, a lifting assembly 500, and a drive assembly 600. The base 100 is a rectangular plate, the column 200 is vertically mounted on the base plate, and the crossbeam 300 is horizontally mounted to the top of the column 200. The stirring rack 400 is mounted on the end of the crossbeam 300 away from the column 200, and is positioned on the side of the crossbeam 300 facing the ground, extending vertically downwards. The drive assembly 600 is mounted on the crossbeam 300 and connected to the stirring rack 400, and is used to drive the stirring rack 400 to rotate. The lifting assembly 500 is mounted on the column 200 and is used to drive the crossbeam 300 to move vertically. Furthermore, a storage cavity 700 for storing the inoculant is provided on the stirring rack 400.

[0031] When inoculating ductile iron, the molten iron to be processed is placed in a ladle, and the inoculant is placed in the receiving cavity 700 on the stirring frame 400. The base 100 is moved to one side of the ladle so that the stirring frame 400 is directly above the ladle. Then, the lifting component 500 drives the stirring frame 400 to move downward into the ladle, and the driving component 600 drives the stirring frame 400 to rotate. The molten iron reacts with the inoculant in the stirring frame 400, and at the same time, the stirring frame 400 stirs the molten iron, so that the molten iron and the inoculant react fully and evenly, thereby making the finished cast iron uniform in texture and improving the quality of the finished cast iron.

[0032] Meanwhile, the movement of the base 100 and the filling of the inoculant on the stirring rack 400 can be carried out during the process of molten iron being poured into the ladle. Compared with the traditional process, which requires the molten iron in the ladle to be completely poured out before the inoculant is manually added to the spheroidizing agent at the bottom of the ladle, the production efficiency is higher.

[0033] Please refer to Figure 2 In some optional embodiments, the stirring rack 400 includes a connecting rod 410, a guide rod 420, a telescopic rod 430, a stirring rod 440, and an adjusting member 450. The connecting rod 410 is vertically connected and mounted on the drive assembly 600, with its end extending vertically downwards. The guide rod 420 is horizontally mounted at one end of the connecting rod 410 near the crossbeam 300, and the telescopic rod 430 is horizontally mounted at the end of the connecting rod 410 away from the crossbeam 300, with the guide rod 420 and the telescopic rod 430 located in the same vertical plane. The telescopic rod 430 can extend and retract along its length. The stirring rod 440 is provided at both ends of the telescopic rod 430, extending vertically toward the guide rod 420, with the end of the stirring rod 440 away from the telescopic rod 430 movably connected to the guide rod 420. The adjusting element 450 is mounted on the guide rod 420 and connected to both stirring rods 440. The adjusting element 450 is used to drive the two guide rods 420 to move closer to each other or further apart.

[0034] In actual production, situations may arise where inoculants are added to ladles of different sizes. When applied to ladles of different sizes, the distance between the two guide rods 420 is adjusted by the adjusting component 450. At this time, the telescopic rod 430 extends and retracts accordingly, thereby adjusting the width of the lower end of the stirring frame 400 so that the stirring frame 400 can extend into ladles of different sizes. Furthermore, in order to improve the stirring effect of molten iron in the ladle, during the stirring process of the stirring frame 400, the two stirring rods 440 can also be driven to move closer or further apart, thereby making the stirring of molten iron more thorough.

[0035] Please refer to Figure 2To allow both ends of the telescopic rod 430 to extend and retract, accommodating situations where the two stirring rods 440 move closer or further apart, in some optional embodiments, the telescopic rod 430 includes a piston rod 431 and sleeve rods 432. The piston rod 431 is fixedly connected to the connecting rod 410, and sleeve rods 432 are slidably fitted onto both ends of the piston rod 431. The two stirring rods 440 are respectively connected to the ends of the two sleeve rods 432 that are further apart. When the adjusting member 450 drives the two stirring rods 440 to move closer or further apart, the two sleeve rods 432 slide on the piston rod 431 to facilitate the movement of the stirring rods 440.

[0036] Please refer to Figure 2 To facilitate the placement of the inoculant on the stirring frame 400, allowing it to be added to the molten iron in the ladle as the stirring frame 400 moves, in some optional embodiments, a receiving cavity 700 is formed along the length of the stirring rod 440, extending through both sides of the stirring rod 440. Simultaneously, a filter screen 710 is provided on both sides of the stirring rod 440. In some optional embodiments, the filter screen 710 is detachably mounted on both sides of the stirring rod 440 by bolts. The inoculant includes metals or alloys such as silicon, barium, and calcium. The filter screen 710 can block the solid inoculant (such as silicon, barium, or calcium) placed in the receiving cavity 700, while the molten iron can enter the receiving cavity 700 through the filter screen 710 to react with the inoculant, thereby achieving the effect of facilitating a thorough and uniform reaction between the inoculant and the molten iron.

[0037] In traditional ductile iron production, reactive slag easily adheres to the inner wall of the ladle. After each heat of molten iron is cast, the reactive slag on the inner wall of the ladle needs to be cleaned and scraped off. This scraping is generally done manually by workers, which is physically demanding. Furthermore, the high temperature of the ladle makes manual scraping of the reactive slag on the inner wall of the ladle a safety hazard. In addition, in traditional operations, the scraping of the reactive slag on the inner wall of the ladle interferes with the feeding of the new material into the ladle, creating overlapping work areas. This results in a time-consuming and inefficient overall cast iron production process.

[0038] Based on this, please refer to some optional embodiments. Figure 2Each of the two stirring rods 440 has a scraper 441 on its opposite side. When removing the reaction slag from the inner wall of the ladle, the stirring rods 440 are driven to be coaxially aligned with the ladle and moved into the ladle. The two stirring rods 440 are then driven to move away from each other and press against the inner wall of the ladle. At this time, the stirring frame 400 rotates, and the scrapers 441 on the stirring rods 440 scrape off the reaction slag from the inner wall of the ladle, achieving rapid removal of the reaction slag. This eliminates the need for manual slag removal, reducing labor intensity and improving production efficiency. It also avoids, to some extent, the safety hazards associated with manual slag removal in high-temperature environments.

[0039] Please refer to Figure 2 To facilitate the simultaneous driving of the two stirring rods 440 towards or away from each other, in some optional embodiments, the adjusting member 450 includes a bidirectional motor 451 and a bidirectional lead screw 452. A guide groove 421 is formed on the guide rod 420 along its length, extending through the lower end of the guide rod 420. The bidirectional lead screw 452 is rotatably mounted on the guide rod 420 and extends along its length, located within the guide groove 421. The upper ends of both stirring rods 440 are slidably engaged within the guide groove 421, and both stirring rods 440 are threaded onto both ends of the bidirectional lead screw 452. The bidirectional motor 451 is mounted on the guide rod 420 and located at one end of the guide rod 420. The output shaft of the bidirectional motor 451 extends along the length of the guide rod 420 and extends into the guide groove 421, coaxially connected to the bidirectional lead screw 452.

[0040] Start the bidirectional motor 451, which drives the bidirectional lead screw 452 to rotate. By controlling the forward and reverse rotation of the bidirectional motor 451, the two stirring rods 440 located at both ends of the bidirectional lead screw 452 are driven to move closer or further apart, so as to facilitate the adjustment of the distance between the two stirring rods 440.

[0041] It should be clarified that the length of the guide rod 420 is greater than the maximum length of the telescopic rod 430. When the stirring frame 400 is placed in the ladle, the lower end of the stirring rod 440 is inside the ladle, while the guide rod 420 is outside the ladle, thus enabling the stirring frame 400 to work normally. At the same time, the guide rod 420 will not come into contact with the molten iron in the ladle, which would damage the adjusting component 450. This allows for the adjustment of the distance between the two stirring rods 440.

[0042] Please refer to Figure 2In some optional embodiments, the drive assembly 600 includes a drive motor 610, which is mounted on the crossbeam 300. The output shaft of the drive motor 610 extends vertically downward and rotatably passes through the crossbeam 300 before connecting to the stirring rack 400. The drive motor 610 facilitates the rotation of the stirring rack 400.

[0043] Please refer to Figure 1 and Figure 3 To facilitate the movement of the base 100 and reduce the time required for the mixing rack 400 to move and position, thereby further improving the production efficiency of ductile iron, in some optional embodiments, multiple self-locking casters 110 are provided at the bottom of the base 100. The self-locking casters 110 make the movement of the base 100 more convenient and faster.

[0044] Please refer to Figure 3 In some optional embodiments, the lifting assembly 500 includes a lifting cylinder 510, and the column 200 includes a receiving section 210 and an adjusting section 220. The receiving section 210 is vertically fixedly installed on the base 100, and the top of the receiving section 210 is open. The adjusting section 220 is slidably disposed within the receiving section 210 in a vertical direction. The lifting cylinder 510 is disposed within the receiving section 210, and the piston rod 431 of the lifting cylinder 510 extends upward along the length direction of the receiving section 210, and the piston rod 431 of the lifting cylinder 510 is connected to the adjusting section 220.

[0045] The principle of the inoculation treatment device for ductile iron in this invention is as follows: When inoculating ductile iron, the molten iron to be processed is placed in a ladle, and the inoculant is placed in the receiving cavity 700 on the stirring frame 400. The base 100 is moved to one side of the ladle so that the stirring frame 400 is directly above the ladle. Then, the stirring frame 400 is driven to move downward into the ladle by the lifting component 500, and the stirring frame 400 is driven to rotate by the driving component 600. The molten iron reacts with the inoculant in the stirring frame 400, and at the same time, the stirring frame 400 stirs the molten iron, so that the molten iron and the inoculant react fully and evenly, thereby making the finished cast iron uniform in texture and improving the quality of the finished cast iron.

[0046] Please refer to Figures 1-3 Furthermore, the present invention also provides a method for casting ductile iron, comprising the following steps: After selecting and weighing the inoculant, place it in the receiving cavity 700 on the stirring rack 400; Move the base 100 to one side of the ladle and position the mixing rack 400 directly above the ladle; Drive the two stirring rods 440 to move closer or further apart, so that the lower dimension of the stirring frame 400 matches the size of the ladle; Start the lifting cylinder 510 to drive the crossbeam 300 to descend, so that the mixing rack 400 moves into the ladle; The driving component 600 drives the stirring frame 400 to rotate, which stirs the molten iron in the ladle. During the rotation of the stirring frame 400, the inoculant and molten iron are fully mixed and reacted. During the rotation of the stirring rack 400, the two stirring rods 440 are driven to move closer or further apart, thereby improving the stirring effect and thus enhancing the reaction effect between the inoculant and the molten iron. After the inoculant has fully reacted, the driving stirrer 400 is moved outside the ladle to pour the molten iron into the casting mold for casting. After all the molten iron in the ladle is poured out, the stirring frame 400 is driven to move back into the ladle, and the two stirring rods 440 are driven to move away from each other until the scraper 441 on the stirring rod 440 comes into contact with the inner wall of the ladle. The stirring frame 400 is then driven to rotate, and the scraper 441 scrapes off the reaction slag on the inner wall of the ladle.

[0047] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. An inoculation treatment apparatus for ductile iron, comprising a ladle, characterized in that, It also includes a base, a column, a crossbeam, a mixing rack, a lifting assembly, and a drive assembly. The column is vertically mounted on the base, the crossbeam is horizontally mounted on the top of the column, the mixing rack is located at the end of the crossbeam away from the column, and the mixing rack extends vertically downward. The drive assembly is mounted on the crossbeam and connected to the mixing rack, and the drive assembly is used to drive the mixing rack to rotate. The mixing rack has a cavity for storing inoculant. The lifting assembly is mounted on the column and connected to the crossbeam, and the lifting assembly is used to drive the crossbeam to move vertically.

2. The inoculation treatment apparatus for ductile iron according to claim 1, characterized in that, The stirring frame includes a connecting rod, a guide rod, a telescopic rod, a stirring rod, and an adjusting component. The connecting rod is vertically mounted on the drive assembly. The guide rod is horizontally connected to one end of the connecting rod near the crossbeam, and the telescopic rod is horizontally connected to the end of the connecting rod away from the crossbeam. The stirring rod is vertically connected to both ends of the telescopic rod, and the other end of the stirring rod extends toward the guide rod and is movably connected to the guide rod. The adjusting component is mounted on the guide rod and connected to the two stirring rods. The adjusting component is used to drive the two guide rods to move closer to or further apart from each other.

3. The inoculation treatment apparatus for ductile iron according to claim 2, characterized in that, The telescopic rod includes a piston rod and a sleeve rod. The piston rod is connected to the connecting rod, and the sleeve rod is slidably sleeved on both ends of the piston rod. The two stirring rods are respectively connected to the opposite ends of the two sleeve rods.

4. The inoculation treatment apparatus for ductile iron according to claim 2, characterized in that, The accommodating cavity is opened along the length of the stirring rod, and filter screens for enclosing the accommodating cavity are provided on both sides of the stirring rod.

5. The inoculation treatment apparatus for ductile iron according to claim 2, characterized in that, The adjusting component includes a bidirectional motor and a bidirectional lead screw. A guide groove is provided on the guide rod along the length direction of the guide rod. The bidirectional lead screw is rotatably mounted on the guide rod and located in the guide groove. Both stirring rods are slidably connected to the guide groove, and the two stirring rods are respectively threaded onto both ends of the bidirectional lead screw. The bidirectional motor is located at one end of the guide rod and coaxially connected to the bidirectional lead screw.

6. The inoculation treatment apparatus for ductile iron according to claim 2, characterized in that, Scrapers are provided on the sides of the two stirring rods that are far apart from each other.

7. The inoculation treatment apparatus for ductile iron according to claim 1, characterized in that, The drive assembly includes a drive motor, which is mounted on the crossbeam. The output shaft of the drive motor rotates vertically through the crossbeam and connects to the stirring frame.

8. The inoculation treatment apparatus for ductile iron according to claim 1, characterized in that, The base is equipped with multiple self-locking casters at its bottom.

9. The inoculation treatment apparatus for ductile iron according to claim 1, characterized in that, The lifting assembly includes a lifting cylinder, the column includes a receiving section and an adjusting section, the adjusting section is slidably disposed within the receiving section, the lifting cylinder is disposed within the receiving section, the lifting cylinder extends along the length direction of the receiving section and is connected to the adjusting section.

10. A method for casting ductile iron, based on the inoculation treatment apparatus according to any one of claims 1-9, characterized in that, Includes the following steps: Place the inoculant to be added into the container on the mixing rack; Move the base so that the mixing rack is directly opposite the ladle, and use the lifting assembly to drive the crossbeam to descend, so that the mixing rack moves into the ladle and the inoculant is added to the molten iron. The stirring frame is driven by the drive component to rotate, which stirs the molten iron in the ladle, so that the inoculant and molten iron are fully mixed and reacted. After the inoculant has fully reacted, the stirring rack is moved outside the ladle to pour the molten iron into the casting mold for casting.

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