Two-stage spheroidizing process and machining equipment for high-nickel austenite ductile iron valve rod nut

Abstract

The invention discloses a two-stage spheroidizing process and processing equipment for a high-nickel austenite ductile iron valve rod nut, and belongs to the technical field of metal smelting, the two-stage spheroidizing process comprises the following steps: S1, preparing raw materials: low-sulfur and low-phosphorus pig iron, scrap steel, ferronickel, a silicon-magnesium-calcium spheroidizing agent and a 75 silicon-iron nucleating agent; the smelting furnace is started, and the low-sulfur and low-phosphorus pig iron, the waste steel and the ferronickel furnace charge are heated to be completely molten; s2, primary spheroidizing: after covering a nucleating agent, rapidly pouring high-temperature molten iron to initiate spheroidizing reaction and promote spheroidizing of graphite; the slagging-off mechanism is convenient and flexible to move, convenient to adapt to different smelting furnaces and casting ladles, convenient to use and capable of rapidly removing dross and rapidly cleaning slag charge, the slagging-off quality is improved, the slagging-off hopper and the striker plate are flexible and rapid to disassemble and assemble and convenient to replace, and the slagging-off efficiency is improved. And then smelting furnaces and molten iron casting ladles with different calibers can be conveniently adapted, so that the technical effect that the slagging-off working efficiency is effectively improved is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of metal smelting, and particularly relates to a secondary spheroidizing process and processing equipment for high-nickel austenitic ductile iron valve stem nuts. Background Art

[0002] High-nickel austenitic ductile iron has excellent comprehensive properties such as corrosion resistance, oxidation resistance, good toughness and strength. These characteristics enable it to be widely used. For example, in valves in some fields such as chemical engineering, ocean engineering, and food processing, valve stem nuts usually need to withstand the erosion of corrosive media, frequent friction, and certain mechanical stresses. High-nickel austenitic ductile iron can well meet these usage requirements and ensure the long-term stable operation of the valves. In the production of ductile iron, the spheroidizing process is one of the key links. Through spheroidizing treatment, the graphite in the cast iron can be transformed from flake shape to spherical shape, thus significantly improving the mechanical properties of the cast iron. For high-nickel austenitic ductile iron valve stem nuts, good spheroidizing effect can not only improve their strength and toughness, but also improve their corrosion resistance and wear resistance. When the traditional single-stage spheroidizing process is used to process high-nickel austenitic ductile iron, it is often difficult to precisely control the spheroidizing effect, and problems such as poor spheroidization, insufficient number of graphite balls, and uneven size are likely to occur, affecting the quality and performance of the valve stem nuts.

[0003] Moreover, in the spheroidizing process, the slag skimming equipment is also crucial. During the spheroidizing reaction process, dross will be generated on the surface of the molten iron. If these dross are not removed in time, they will mix into the molten iron, resulting in slag inclusion defects in the castings, reducing the quality and performance of the castings. Most common slag skimming mechanisms are fixedly installed on the melting furnace or spheroidizing ladle equipment, with poor flexibility in use and being not conducive to adapting to different melting furnaces or spheroidizing ladles. Summary of the Invention

[0004] Aiming at the problems existing in the prior art, the invention provides a secondary spheroidizing process and processing equipment for high-nickel austenitic ductile iron valve stem nuts, which have the advantages of improving the spheroidizing effect by adding spheroidizing agent twice through the secondary spheroidizing process, effectively improving the quality of castings and enhancing the product performance through secondary inoculation and slag skimming; the slag skimming mechanism can move conveniently and flexibly, facilitating adaptation to different melting furnaces and ladles, being convenient for quickly skimming the dross, and being able to quickly clean the slag material, improving the quality of slag skimming, and the slag skimming bucket and baffle can be disassembled and assembled flexibly and quickly, being convenient for replacement, and then being conducive to adapting to melting furnaces and molten iron ladles with different caliber sizes, thus effectively improving the slag skimming work efficiency. The invention solves the problems that in the prior art, it is often difficult to precisely control the spheroidizing effect when the traditional single-stage spheroidizing process is used to process high-nickel austenitic ductile iron; and most slag skimming mechanisms are fixedly installed on the melting furnace or spheroidizing ladle equipment, with poor flexibility in use and being not conducive to adapting to different melting furnaces or spheroidizing ladles.

[0005] The present invention is implemented as follows. A processing device for a secondary spheroidizing process of a high-nickel austenitic ductile iron valve stem nut includes the following steps:

[0006] S1. Raw material preparation:

[0007] Raw materials: low-sulfur and low-phosphorus pig iron, scrap steel, ferronickel, ferrosilicon-magnesium-calcium spheroidizing agent, 75 ferrosilicon inoculant;

[0008] Smelting: Start the furnace, heat the low-sulfur and low-phosphorus pig iron, scrap steel and ferronickel furnace charges until completely melted, conduct spectral analysis to adjust the composition when controlling the temperature at 1460 - 1480 °C, so that the molten iron composition meets the requirements of the high-nickel austenitic ductile iron valve stem nut;

[0009] S2. Primary spheroidizing:

[0010] Spheroidizing treatment: Preheat the spheroidizing ladle, place the spheroidizing agent at the bottom of the ladle, cover it with the inoculant and then quickly pour in the high-temperature molten iron to initiate the spheroidizing reaction. With a reaction time of 3 - 5 minutes, promote the spheroidization of graphite;

[0011] First slag skimming: After the spheroidizing reaction is completed, move the slag skimming mechanism to the spheroidizing ladle. The slag skimming assembly drives the slag skimming bucket to move downward to a suitable position. The slag skimming bucket rotates along the water surface and cooperates with the baffle plate to skim the floating slag on the surface of the molten iron, reset and separate from the water surface, and then rotate the bottom plate to be placed below the slag skimming bucket, and then drive the slag skimming bucket to rotate to correspond to the cleaning assembly, so that the cleaning push plate penetrates into the inside of the slag skimming bucket to realize the pushing and cleaning of the slag material. Repeat the above operations for slag skimming again until the slag skimming is completed;

[0012] Inoculation treatment: After slag skimming, add the inoculant with the flow during pouring;

[0013] S3. Secondary spheroidizing:

[0014] Secondary spheroidizing: Add a secondary spheroidizing agent with a dosage of 30% - 50% of the first spheroidizing agent dosage to further improve the spheroidizing effect;

[0015] Secondary slag skimming: After secondary spheroidizing, skim the floating slag generated by the reaction again. The operation of secondary slag skimming is the same as that of the first slag skimming until the slag skimming is completed;

[0016] Secondary inoculation: After slag skimming, add an inoculant with a weight of 0.2% - 0.3% of the molten iron weight with the flow during pouring to consolidate the inoculation effect;

[0017] S4. Pouring and forming:

[0018] Skim the slag from the treated molten iron, remove the molten slag and impurities on the surface of the molten iron, and conduct pouring at a temperature of 1400 °C - 1450 °C. Pour the molten iron into a pre-prepared mold to form a valve stem nut casting.

[0019] A processing device for a secondary spheroidizing process of a high-nickel austenitic ductile iron valve stem nut, applicable to the secondary spheroidizing process of the high-nickel austenitic ductile iron valve stem nut, includes: a spheroidizing ladle body and a slag skimming mechanism. The slag skimming mechanism is located outside the spheroidizing ladle body, and a slag skimming assembly is installed at the top of the slag skimming mechanism. The slag skimming assembly is used to remove the floating slag in the spheroidizing ladle body.

[0020] With this setting, the slag skimming mechanism can move conveniently and flexibly, facilitating adaptation to different melting furnaces and ladles, enabling quick skimming of the floating slag, being convenient to use, and also being able to quickly clean the slag material, improving the quality of slag skimming, and thus effectively improving the slag skimming work efficiency.

[0021] As a preferred embodiment of the present invention: The slag skimming mechanism includes a support frame. A support plate is fixedly connected to the top of the support frame. The slag skimming assembly is installed at the front bottom of the support plate. The slag skimming assembly includes a slag skimming bucket that can move up and down. A rotation adjustment member is installed above the slag skimming bucket. A cleaning assembly is slidably installed on the left inner wall of the support frame. The cleaning assembly includes a cleaning push plate, and the cleaning push plate is used to penetrate the slag skimming bucket to clean the slag material inside it. The rotation adjustment member can drive the slag skimming bucket to rotate to perform the slag skimming operation on the one hand, and can drive the cleaning push plate to move to perform the cleaning operation of the slag skimming material on the other hand.

[0022] With this setting, it is convenient for the stable installation of the slag skimming bucket and easy to use. The slag skimming bucket can cooperate with the rotation adjustment member on the one hand to realize the rotation slag skimming operation of the slag skimming bucket, which is conducive to full contact with the floating slag on the surface of the molten iron, making the slag skimming effect more sufficient. On the other hand, it can cooperate closely with the rotation adjustment member and the cleaning assembly to realize the pushing and cleaning operation of the cleaning push plate on the slag material inside the slag skimming bucket, improving the use effect of the slag skimming bucket, avoiding the phenomenon that the slag material falls into the molten iron again during the next slag skimming operation, and thus effectively improving the work efficiency.

[0023] As a preferred embodiment of the present invention: The rotation adjustment member includes a rotating rod. A telescopic cylinder is fixedly installed on the top of the support plate. The output end of the telescopic cylinder penetrates to the bottom of the support plate and is fixedly connected to a lifting rod. The upper end of the rotating rod is connected to the bottom of the lifting rod through a bearing, and a connecting plate is fixedly sleeved on the bottom side wall of the lifting rod.

[0024] With this setting, it is convenient for the stable installation of the lifting rod, facilitating the lifting rod to drive the rotation adjustment member to perform up and down movement operations, and then facilitating the driving of the rotating rod to perform up and down movement operations.

[0025] As a preferred embodiment of the present invention: a gear is sleeved and fixed on the upper end of the rotating rod, a toothed disc is connected to the bottom of the connecting plate through a bearing, the toothed disc and the gear are meshingly connected, a motor is fixedly installed on the top of the connecting plate, the output end of the motor is fixedly connected to the shaft of the toothed disc, a first set of plates and a second set of plates are fixedly connected to one side of the scraper bucket, the first set of plates and the second set of plates are slidably sleeved on the lower part of the rotating rod, a sleeve is sleeved on the rotating rod corresponding to the first set of plates and the second set of plates, and a material baffle plate is fixed to the outer wall of the sleeve by bolts.

[0026] This arrangement facilitates the stable installation of the slag bucket and the rotating rod, and then facilitates the rotating rod to drive the slag bucket to move up and down, and facilitates the slag bucket to be driven downward into the molten iron to perform the slag removal operation, and after the end, drives the slag bucket to move upward to separate from the molten iron, which is easy to use. Through the gears and toothed discs, it is easy to drive the rotating rod to rotate, and then facilitates the slag bucket to rotate. During the rotation process, the slag bucket gradually approaches the material baffle plate, so that the floating slag is blocked by the material baffle plate and gathered in the slag bucket, thereby realizing the rotating slag removal operation of the molten iron, which is easy to use.

[0027] As a preferred embodiment of the present invention: the side wall of the rotating rod is fixedly connected with a positioning block, the first set plate and the second set plate are both provided with sleeve holes, the sleeve holes are matched with the rotating rod, and the sleeve holes of the first set plate are provided with positioning holes, and the positioning holes are matched with the positioning blocks.

[0028] This arrangement facilitates the sliding connection between the slag bucket and the rotating rod. When the positioning block of the rotating rod is inserted into the positioning hole of the first set of plates, the rotating rod can drive the first set of plates to rotate synchronously, and then drive the slag bucket to rotate synchronously to realize the rotating slag bucketing operation. When the positioning block is disengaged from the positioning hole, the slag bucket is disengaged from the restriction of the rotating rod, so that the rotating rod does not drive the slag bucket to rotate, which facilitates the subsequent cleaning push plate to perform a stable cleaning operation on the slag material inside the slag bucket.

[0029] As a preferred embodiment of the present invention: the bottom of the rotating rod is threadedly connected with a threaded plate, a support spring is provided between the second sleeve plate and the threaded plate, the support spring is sleeved on the rotating rod, the bottom of the support plate is threadedly connected with a limit rod, the limit rod corresponds to the top of the scraper bucket, the front end of the scraper bucket is set as an open end, the rear end of the scraper bucket is hinged with a cover plate, and a bent spring is fixedly connected between the cover plate and the top of the scraper bucket.

[0030] The slag scraping bucket is conveniently supported elastically by the first set of plates, the second set of plates and the supporting spring, and the slag scraping bucket and the material baffle plate can be slid and pulled out by twisting the threaded plate, so that the slag scraping bucket and the material baffle plate can be flexibly and quickly disassembled and assembled, and it is convenient to replace, and then it is convenient to adapt to smelting furnaces and molten iron ladles of different sizes. The cleaning plate is convenient to push it through the cover plate, which is beneficial to cleaning and discharging the slag material inside the slag scraping bucket. It is convenient to use. When the slag material inside the slag scraping bucket is cleaned, the slag scraping bucket moves upward and separates from the molten iron surface, and then rotates and separates from the material baffle plate until the opening end of the slag scraping bucket faces the cleaning push plate. The rotating rod drives the slag scraping bucket to move upward again to abut the limit rod. At this time, the position of the slag scraping bucket is limited. When it continues to move upward, the rotating rod drives the positioning block to disengage from the positioning hole, and drives the toothed disc to dock with the cleaning component. At this time, the slag scraping bucket extrusion support spring does not rotate with the rotating rod and is directly corresponding to the cleaning push plate. The cleaning push plate can move into the interior of the slag scraping bucket and abuts the cover plate to push and sweep back and forth to achieve the cleaning operation.

[0031] As a preferred embodiment of the present invention: the cleaning push plate can push the cover plate to open when performing cleaning work, the side wall of the cleaning push plate is fixedly connected with evenly distributed cleaning brushes, the back of the cleaning push plate is fixedly connected with a push rod, the end of the push rod is fixedly connected with a telescopic rack, and when cleaning work is performed, the telescopic rack is meshed and connected with the toothed disc.

[0032] Through this arrangement, when the slag inside the scraper bucket is cleaned, the open end of the scraper bucket rotates to face the cleaning push plate, and the rotating rod drives the gear, turntable, and scraper bucket to continue to move upward, driving the toothed disc to move to the meshing position with the telescopic rack of the cleaning component. At this time, the scraper bucket is restricted by the limit rod, and the scraper bucket does not rotate with the rotating rod and corresponds to the cleaning push plate. Then the toothed disc drives the rotating rod and the gear to continue to rotate, and then drives the telescopic rack to extend and move, thereby driving the push rod to push the cleaning push plate toward the inside of the scraper bucket and press the cover plate to perform back and forth pushing and sweeping cleaning to achieve the cleaning operation.

[0033] As a preferred embodiment of the present invention: the left inner wall of the support frame is fixedly connected with the first support ring and the second support ring, the telescopic rack and the push rod slide through the first support ring and the second support ring respectively, the support frame is connected with a ring through a bearing sleeve, and the outer wall of the ring is fixed with a base plate by bolts.

[0034] This arrangement facilitates the stable installation of the telescopic rack and the push rod, and is easy to use. When cleaning the slag inside the slag bucket, the slag bucket moves upward and away from the surface of the molten iron, and then the bottom plate is rotated and placed underneath it, and then the slag bucket is rotated again to separate from the baffle plate and correspond to the cleaning push plate, and then the slag inside the slag bucket is cleaned by moving the cleaning push plate back and forth, which makes it easy to receive the slag and is easy to use.

[0035] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0036] By adding spheroidizing agent twice, the spheroidizing effect is greatly improved, making the graphite balls more round and evenly distributed. Combined with secondary inoculation, the inoculation result is consolidated. Double slag skimming effectively removes impurities, comprehensively improves the quality of castings, and enhances the strength and toughness of valve stem nuts.

[0037] The slag skimming mechanism can move conveniently and flexibly, facilitating adaptation to different melting furnaces and ladles, facilitating rapid skimming of floating slag, being easy to use, and capable of quickly cleaning slag materials, improving the quality of slag skimming. Moreover, the slag skimming bucket and baffle can be disassembled and assembled flexibly and quickly, facilitating replacement, and then facilitating adaptation to melting furnaces and molten iron ladles of different calibers, thus effectively improving the work efficiency of slag skimming. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 is a schematic diagram of the overall structure provided by an embodiment of the present invention;

[0039] Figure 2 is a schematic diagram of the structure of the slag skimming mechanism provided by an embodiment of the present invention;

[0040] Figure 3 is a schematic diagram of the rear view structure of the slag skimming mechanism provided by an embodiment of the present invention;

[0041] Figure 4 is a schematic diagram of the split structure at the rotating rod provided by an embodiment of the present invention;

[0042] Figure 5 is a schematic diagram of the structure of the cleaning push plate provided by an embodiment of the present invention;

[0043] Figure 6 is a schematic diagram of the structure of the slag skimming bucket provided by an embodiment of the present invention.

[0044] In the figure: 1. Spheroidizing ladle body; 2. Support frame; 201. Support plate; 202. First support ring; 203. Second support ring; 3. Slag skimming bucket; 301. Cover plate; 302. Bent spring; 303. First sleeve plate; 304. Sleeve hole; 305. Positioning hole; 306. Second sleeve plate; 307. Support spring; 4. Baffle; 401. Sleeve; 5. Rotating rod; 501. Gear; 502. Positioning block; 503. Threaded plate; 6. Lifting rod; 601. Telescopic cylinder; 602. Connecting plate; 603. Motor; 604. Tooth disc; 7. Cleaning push plate; 701. Cleaning brush; 702. Push rod; 703. Telescopic rack; 8. Bottom plate; 801. Sleeve ring; 9. Limit rod. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0045] In order to further understand the content, features and effects of the present invention, the following embodiments are cited and described in detail in conjunction with the accompanying drawings.

[0046] The structure of the present invention will be described in detail below with reference to the accompanying drawings.

[0047] Refer to Figures 1 to 6 As shown, the processing equipment for the secondary spheroidizing process of a high-nickel austenitic ductile iron valve stem nut provided by an embodiment of the present invention includes the following steps:

[0048] S1. Raw material preparation:

[0049] Raw materials: low-sulfur and low-phosphorus pig iron, scrap steel, ferronickel, ferrosilicon-magnesium-calcium spheroidizing agent, 75 ferrosilicon inoculant;

[0050] Smelting: Start the furnace, heat the low-sulfur and low-phosphorus pig iron, scrap steel and ferronickel furnace charges until they are completely melted, and perform spectral analysis to adjust the composition when the temperature is controlled at 1460 - 1480 °C, so that the molten iron composition meets the requirements of the high-nickel austenitic ductile iron valve stem nut;

[0051] S2. Primary spheroidizing:

[0052] Spheroidizing treatment: Preheat the spheroidizing ladle, place the spheroidizing agent at the bottom of the ladle, cover it with the inoculant, and then quickly pour in the high-temperature molten iron to initiate the spheroidizing reaction. With a reaction time of 3 - 5 minutes, promote the spheroidization of graphite;

[0053] First slag skimming: After the spheroidizing reaction is completed, move the slag skimming mechanism to the spheroidizing ladle. The slag skimming assembly drives the slag skimming bucket 3 to move downward to a suitable position. The slag skimming bucket 3 rotates along the water surface and cooperates with the baffle plate 4 to skim the floating slag on the surface of the molten iron, reset and separate from the water surface, and then rotate the bottom plate 8 to be placed below the slag skimming bucket 3. Then drive the slag skimming bucket 3 to rotate to correspond to the cleaning assembly, so that the cleaning push plate 7 penetrates into the interior of the slag skimming bucket 3 to realize the pushing and cleaning of the slag material. Repeat the above operations for slag skimming again until the slag skimming is completed;

[0054] Inoculation treatment: After slag skimming, add the inoculant during pouring with the flow;

[0055] S3. Secondary spheroidizing:

[0056] Secondary spheroidizing: Add a secondary spheroidizing agent with a dosage of 30% - 50% of the first spheroidizing agent dosage to further improve the spheroidizing effect;

[0057] Secondary slag skimming: After secondary spheroidizing, skim the floating slag generated by the reaction again. The operation of secondary slag skimming is the same as that of the first slag skimming until the slag skimming is completed;

[0058] Secondary inoculation: After slag skimming, add an inoculant with a weight of 0.2% - 0.3% of the molten iron weight during pouring to consolidate the inoculation effect;

[0059] S4. Pouring and forming:

[0060] The treated molten iron is skimmed to remove slag and impurities on the surface of the molten iron, and then poured at a temperature of 1400°C-1450°C into a pre-prepared mold to form a valve stem nut casting.

[0061] A processing equipment for the secondary spheroidizing process of high-nickel austenitic ductile iron valve stem nuts is suitable for the secondary spheroidizing process of high-nickel austenitic ductile iron valve stem nuts, comprising: a spheroidizing ladle body 1 and a slag removal mechanism, wherein the slag removal mechanism is located on the outside of the spheroidizing ladle body 1, and a slag removal assembly is installed on the top of the slag removal mechanism, and the slag removal assembly is used to remove slag in the spheroidizing ladle body 1.

[0062] By adopting the above scheme, the slag scraping mechanism is convenient and flexible to move, easy to adapt to different smelting furnaces and ladles, convenient to quickly scrape the slag, easy to use, and can also quickly clean the slag, thereby improving the quality of slag scraping, thereby effectively improving the slag scraping work efficiency.

[0063] Specifically: the slag scraping mechanism includes a support frame 2, the top of the support frame 2 is fixedly connected to a support plate 201, the slag scraping assembly is installed at the bottom of the front end of the support plate 201, the slag scraping assembly includes a slag scraping bucket 3 that can move up and down, a rotating adjustment member is installed above the slag scraping bucket 3, and a cleaning assembly is slidably installed on the left inner wall of the support frame 2, and the cleaning assembly includes a cleaning push plate 7, and the cleaning push plate 7 is used to penetrate the slag scraping bucket 3 to clean the slag material inside it. The rotating adjustment member can drive the slag scraping bucket 3 to rotate to realize the slag scraping operation on the one hand, and can drive the cleaning push plate 7 to move to realize the cleaning operation of the slag material on the other hand.

[0064] The above scheme is adopted to facilitate the stable installation of the slag bucket 3 and easy use. On the one hand, the slag bucket 3 can cooperate with the rotating adjustment member to realize the rotating slag removal operation of the slag bucket 3, which is beneficial to fully contact the slag on the surface of the molten iron, making the slag removal effect more sufficient. On the other hand, it can cooperate closely with the rotating adjustment member and the cleaning component to realize the cleaning and sweeping cleaning operation of the cleaning push plate 7 on the slag material inside the slag bucket 3, thereby improving the use effect of the slag bucket 3 and avoiding the phenomenon that the slag material falls into the molten iron again during the next slag removal operation, thereby effectively improving the work efficiency.

[0065] Specifically: the rotating adjustment member includes a rotating rod 5, a telescopic cylinder 601 is fixedly installed on the top of the support plate 201, the output end of the telescopic cylinder 601 passes through the bottom of the support plate 201 and is fixedly connected to a lifting rod 6, the upper end of the rotating rod 5 is connected to the bottom of the lifting rod 6 through a bearing, and a connecting plate 602 is fixedly sleeved on the bottom side wall of the lifting rod 6.

[0066] The above solution facilitates the stable installation of the lifting rod 6, facilitates the lifting rod 6 to drive the rotating adjustment member to move up and down, and then facilitates the lifting rod 6 to drive the rotating rod 5 to move up and down.

[0067] Specifically, a gear 501 is fixedly sleeved on the upper end of the rotating rod 5. The bottom of the connecting plate 602 is connected with a toothed disc 604 through a bearing. The toothed disc 604 and the gear 501 are meshed and connected. A motor 603 is fixedly installed on the top of the connecting plate 602. The output end of the motor 603 is fixedly connected with the shaft part of the toothed disc 604. One side of the slag skimmer 3 is fixedly connected with a first sleeve plate 303 and a second sleeve plate 306. The first sleeve plate 303 and the second sleeve plate 306 are slidably sleeved on the lower part of the rotating rod 5. A sleeve 401 is sleeved on the rotating rod 5 corresponding to the first sleeve plate 303 and the second sleeve plate 306. A baffle plate 4 is fixed on the outer wall of the sleeve 401 through bolts.

[0068] With the above scheme, it is convenient to stably install the slag skimmer 3 and the rotating rod 5. Then, it is convenient for the rotating rod 5 to drive the slag skimmer 3 to move up and down. It is convenient to drive the slag skimmer 3 to extend downward into the molten iron for slag skimming operation. After that, it drives the slag skimmer 3 to move upward to separate from the molten iron. It is easy to use. Through the gear 501 and the toothed disc 604, it is convenient to drive the rotating rod 5 to rotate. Then, it is convenient to drive the slag skimmer 3 to rotate. And during the rotation of the slag skimmer 3, it gradually approaches the baffle plate 4, so that the floating slag is blocked by the baffle plate 4 and gathered into the slag skimmer 3, realizing the rotating slag skimming operation of the molten iron. It is easy to use.

[0069] Specifically, a positioning block 502 is fixedly connected to the side wall of the rotating rod 5. Through holes 304 are formed in both the first sleeve plate 303 and the second sleeve plate 306. The through holes 304 are matched and connected with the rotating rod 5. A positioning hole 305 is formed at the through hole 304 of the first sleeve plate 303. The positioning hole 305 is matched and connected with the positioning block 502.

[0070] With the above scheme, it is convenient for the slag skimmer 3 to be slidably connected with the rotating rod 5. When the positioning block 502 of the rotating rod 5 is inserted into the positioning hole 305 of the first sleeve plate 303, it is convenient for the rotating rod 5 to drive the first sleeve plate 303 to rotate synchronously when rotating. Then, it is convenient to drive the slag skimmer 3 to rotate synchronously to realize the rotating slag skimming operation. When the positioning block 502 is separated from the positioning hole 305, the slag skimmer 3 is released from the restriction of the rotating rod 5, so that the rotating rod 5 does not drive the slag skimmer 3 to rotate, which is convenient for the subsequent cleaning push plate 7 to stably clean the slag in the slag skimmer 3.

[0071] Specifically: the bottom of the rotating rod 5 is threadedly connected with a threaded plate 503, a support spring 307 is provided between the second sleeve plate 306 and the threaded plate 503, the support spring 307 is sleeved on the rotating rod 5, the bottom of the support plate 201 is threadedly connected with a limit rod 9, the limit rod 9 corresponds to the top of the scraper bucket 3, the front end of the scraper bucket 3 is set as an open end, the rear end of the scraper bucket 3 is hinged with a cover plate 301, and a bent spring 302 is fixedly connected between the cover plate 301 and the top of the scraper bucket 3.

[0072] By adopting the above scheme, the first set of plates 303, the second set of plates 306 and the supporting springs 307 are used to elastically support the slag bucket 3, facilitate the elastic sliding of the slag bucket 3, and the slag bucket 3 and the material blocking plate 4 can be slid and withdrawn by twisting the threaded plate 503, so that the slag bucket 3 and the material blocking plate 4 can be slid and withdrawn, so that the slag bucket 3 and the material blocking plate 4 can be flexibly and quickly disassembled and replaced, and then it is convenient to adapt to smelting furnaces and molten iron ladles of different sizes. The cleaning plate is pushed by the cover plate 301, which is conducive to cleaning and discharging the slag inside the slag bucket 3. It is easy to use. When the slag inside the slag bucket 3 is cleaned, the slag bucket 3 moves upward to separate from the iron ladles. When the cleaning bucket 3 is in the water surface, it rotates and separates from the material baffle plate 4 until the opening end of the cleaning bucket 3 faces the cleaning push plate 7. The rotating rod 5 drives the cleaning bucket 3 to move upward again to abut against the limiting rod 9. At this time, the position of the cleaning bucket 3 is restricted. When it continues to move upward, the rotating rod 5 drives the positioning block 502 to disengage from the positioning hole 305, and drives the toothed disc 604 to dock with the cleaning component. At this time, the cleaning bucket 3 squeezes the support spring 307 and does not rotate with the rotating rod 5 and corresponds to the cleaning push plate 7. The cleaning push plate 7 can move into the interior of the cleaning bucket 3 and abut against the cover plate 301 to perform back and forth pushing and sweeping cleaning to achieve the cleaning operation.

[0073] Specifically: the cleaning push plate 7 can push the cover plate 301 to open during cleaning work, and the side wall of the cleaning push plate 7 is fixedly connected with evenly distributed cleaning brushes 701, and the back of the cleaning push plate 7 is fixedly connected with a push rod 702, and the end of the push rod 702 is fixedly connected with a telescopic rack 703. When cleaning work is performed, the telescopic rack 703 is meshed with the toothed disc 604.

[0074] By adopting the above scheme, when the slag inside the scraper bucket 3 is cleaned, the open end of the scraper bucket 3 rotates to face the cleaning push plate 7, and the rotating rod 5 drives the gear 501, the turntable, and the scraper bucket 3 to continue to move upward, driving the toothed disc 604 to move to the meshing position with the telescopic rack 703 of the cleaning component. At this time, the scraper bucket 3 is restricted by the limit rod 9, and the scraper bucket 3 does not rotate with the rotating rod 5 and corresponds to the cleaning push plate 7. Then the toothed disc 604 drives the rotating rod 5 and the gear 501 to continue to rotate, and then drives the telescopic rack 703 to extend and move, thereby driving the push rod 702 to push the cleaning push plate 7 toward the inside of the scraper bucket 3 and press the cover plate 301 to perform back and forth pushing and sweeping cleaning to achieve the cleaning operation.

[0075] Specifically: the left inner wall of the support frame 2 is fixedly connected with the first support ring 202 and the second support ring 203, the telescopic rack 703 and the push rod 702 slide through the first support ring 202 and the second support ring 203 respectively, and the support frame 2 is connected with a ring 801 through a bearing sleeve, and the outer wall of the ring 801 is fixed with a base plate 8 by bolts.

[0076] The above scheme is adopted to facilitate the stable installation of the telescopic rack 703 and the push rod 702, and is easy to use. When the slag inside the slag bucket 3 is cleaned, the slag bucket 3 moves upward and away from the surface of the molten iron, and then the bottom plate 8 can be rotated and placed underneath it, and then the slag bucket 3 is rotated to separate from the material baffle plate 4 and correspond to the cleaning push plate 7, and then the slag inside the slag bucket 3 is cleaned by moving the cleaning push plate 7 back and forth, which is convenient for receiving the slag and easy to use.

[0077] Working principle of the present invention:

[0078] When slag removal is carried out, the slag removal mechanism is moved to a suitable position of the spheroidizing ladle body 1 through the rollers at the bottom of the support frame 2, and the telescopic cylinder 601 is started to drive the lifting rod 6 to move, and the rotating rod 5 and the slag removal bucket 3 are driven to move downward to the slag on the surface of the molten iron. The motor 603 is then started to drive the toothed disc 604 and the gear 501 to rotate, and the rotating rod 5 and the slag removal bucket 3 are driven to rotate. During the rotation of the slag removal bucket 3, the slag removal bucket 3 gradually approaches the material baffle plate 4, so that the slag is blocked by the material baffle plate 4 and gathered into the slag removal bucket 3, thereby realizing the rotational slag removal operation of the molten iron. It is easy to use. After slag removal, the lifting rod 6 drives the rotating rod 5, the slag removal bucket 3 and the material baffle plate 4 to move upward and away from the molten iron.

[0079] When cleaning, after the scraper bucket 3 moves upward and leaves the surface of the molten iron, the bottom plate 8 can be rotated and placed below it, and then the scraper bucket 3 is rotated and separated from the material blocking plate 4 until the opening end of the scraper bucket 3 faces the cleaning push plate 7. The rotating rod 5 drives the scraper bucket 3 to move upward again to abut against the limit rod 9, so that the position of the scraper bucket 3 is restricted. When continuing to move upward, the rotating rod 5 drives the positioning block 502 to disengage from the positioning hole 305, and drives the toothed disc 604 to engage with the telescopic rack 703. At this time, the squeezing support spring 307 of the scraper bucket 3 does not rotate with the rotating rod 5 and is in direct correspondence with the cleaning push plate 7. Then, the motor 603 drives the rotating rod 5 and the gear 501 to continue to rotate through the toothed disc 604, and then drives the telescopic rack 703 to extend and move, thereby driving the push rod 702 to push the cleaning push plate 7 toward the inside of the scraper bucket 3, and push the cover plate 301, driving the cleaning brush 701 to contact the inner wall of the scraper bucket 3, and perform back and forth pushing and sweeping cleaning to achieve the cleaning operation.

[0080] Moreover, through the cooperation of the threaded plate 503, the support spring 307, the first sleeve plate 303, the second sleeve plate 306, the sleeve 401, the positioning hole 305 and the rotating rod 5, not only can the slag scraping bucket 3 be driven to rotate for slag scraping work, but also the slag scraping bucket 3 can be conveniently disengaged from the restriction of the rotating rod 5 and cooperate with the cleaning push plate 7 for cleaning work. Moreover, it is also convenient for the rapid removal of bricks from the slag scraping bucket 3 and the baffle plate 4, facilitating replacement and flexible use. Subsequently, it is convenient to adapt to melting furnaces and molten iron ladles of different caliber sizes, thereby effectively improving the slag scraping work efficiency.

[0081] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0082] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A secondary spheroidizing process for a high-nickel austenitic ductile iron valve stem nut, characterized in that, It includes the following steps: S1. Raw material preparation: Raw materials: low-sulfur and low-phosphorus pig iron, scrap steel, ferronickel, silicon-magnesium-calcium nodulizer, 75% ferrosilicon inoculant; Smelting: Start the furnace, heat the low-sulfur and low-phosphorus pig iron, scrap steel and ferronickel furnace charges until completely melted, conduct spectral analysis to adjust the composition when controlling the temperature at 1460 - 1480 °C, so that the molten iron composition meets the requirements of the high-nickel austenitic ductile iron valve stem nut; S2. Primary nodulization: Nodulization treatment: Preheat the nodulization ladle, place the nodulizer at the bottom of the ladle, cover it with the inoculant and then quickly pour in the high-temperature molten iron to trigger the nodulization reaction. With a reaction time of 3 - 5 minutes, promote the spheroidization of graphite; Primary slag skimming: After the nodulization reaction is completed, move the slag skimming mechanism to the nodulization ladle. The slag skimming assembly drives the slag skimming bucket (3) to move downward to a suitable position. The slag skimming bucket (3) rotates along the water surface and cooperates with the baffle plate (4) to skim the floating slag on the surface of the molten iron, reset and separate from the water surface, and rotate the bottom plate (8) to be placed below the slag skimming bucket (3), then drive the slag skimming bucket (3) to rotate to correspond to the cleaning assembly, so that the cleaning push plate (7) penetrates into the interior of the slag skimming bucket (3) to realize the pushing and cleaning of the slag material. Repeat the above operations for slag skimming again until the slag skimming is completed; Inoculation treatment: After slag skimming, add the inoculant with the flow during pouring; S3. Secondary nodulization: Secondary nodulization: Add a secondary nodulizer with a dosage of 30% - 50% of the first nodulizer dosage to further improve the nodulization effect; Secondary slag skimming: After secondary nodulization, skim the floating slag generated by the reaction again. The operation of secondary slag skimming is the same as that of primary slag skimming until the slag skimming is completed; Secondary inoculation: After slag skimming, add an inoculant with a weight of 0.2% - 0.3% of the molten iron weight with the flow during pouring to consolidate the inoculation effect; S4. Pouring and forming: Skim the slag from the treated molten iron to remove the molten slag and impurities on the surface of the molten iron, and conduct pouring at a temperature of 1400 °C - 1450 °C. Pour the molten iron into a pre-prepared mold to form a valve stem nut casting.

2. Processing equipment for a secondary spheroidizing process of a high-nickel austenitic ductile iron valve stem nut, characterized in that, The secondary nodulization process of the high-nickel austenitic ductile iron valve stem nut as claimed in claim 1, includes: a nodulization ladle body (1) and a slag skimming mechanism. The slag skimming mechanism is located outside the nodulization ladle body (1), and a slag skimming assembly is installed at the top of the slag skimming mechanism. The slag skimming assembly is used to remove the floating slag in the nodulization ladle body (1).

3. The processing equipment for the secondary spheroidizing process of a high-nickel austenitic ductile iron valve stem nut as described in claim 2, characterized in that: The slag skimming mechanism includes a support frame (2). A support plate (201) is fixedly connected to the top of the support frame (2). The slag skimming assembly is installed at the front bottom of the support plate (201). The slag skimming assembly includes a slag skimming bucket (3) that can move up and down. A rotation adjustment part is installed above the slag skimming bucket (3). A cleaning assembly is slidably installed on the left inner wall of the support frame (2). The cleaning assembly includes a cleaning push plate (7). The cleaning push plate (7) is used to penetrate into the slag skimming bucket (3) to clean the slag material inside it. The rotation adjustment part can drive the slag skimming bucket (3) to rotate to realize the slag skimming operation on the one hand, and drive the cleaning push plate (7) to move to realize the cleaning operation of the slag skimming material on the other hand.

4. The processing equipment for the secondary spheroidizing process of a high-nickel austenitic ductile iron valve stem nut according to claim 3, characterized in that: The rotation adjusting member includes a rotating rod (5). A telescopic cylinder (601) is fixedly installed at the top of the support plate (201). The output end of the telescopic cylinder (601) penetrates to the bottom of the support plate (201) and is fixedly connected to a lifting rod (6). The upper end of the rotating rod (5) is connected to the bottom of the lifting rod (6) through a bearing. A connecting plate (602) is fixedly sleeved on the bottom side wall of the lifting rod (6).

5. The processing equipment for the secondary spheroidizing process of a high-nickel austenitic ductile iron valve stem nut as described in claim 4, characterized in that: A gear (501) is fixedly sleeved on the upper end of the rotating rod (5). A toothed disc (604) is connected to the bottom of the connecting plate (602) through a bearing. The toothed disc (604) and the gear (501) are meshed and connected. A motor (603) is fixedly installed at the top of the connecting plate (602). The output end of the motor (603) is fixedly connected to the shaft part of the toothed disc (604). A first sleeve plate (303) and a second sleeve plate (306) are fixedly connected to one side of the slag skimming bucket (3). The first sleeve plate (303) and the second sleeve plate (306) are slidably sleeved on the lower part of the rotating rod (5). A sleeve (401) is sleeved on the rotating rod (5) corresponding to the first sleeve plate (303) and the second sleeve plate (306). A baffle plate (4) is fixed to the outer wall of the sleeve (401) by bolts.

6. The processing equipment for the secondary spheroidizing process of a high-nickel austenitic ductile iron valve stem nut as described in claim 5, characterized in that: A positioning block (502) is fixedly connected to the side wall of the rotating rod (5). Sleeve holes (304) are formed in both the first sleeve plate (303) and the second sleeve plate (306). The sleeve holes (304) are matched and connected with the rotating rod (5). A positioning hole (305) is formed at the sleeve hole (304) of the first sleeve plate (303). The positioning hole (305) is matched and connected with the positioning block (502).

7. The processing equipment for the secondary spheroidizing process of a high-nickel austenitic ductile iron valve stem nut as described in claim 6, characterized in that: A threaded plate (503) is threadedly connected to the bottom of the rotating rod (5). A support spring (307) is arranged between the second sleeve plate (306) and the threaded plate (503). The support spring (307) is sleeved on the rotating rod (5). A limiting rod (9) is threadedly connected to the bottom of the support plate (201). The limiting rod (9) is located above the slag skimming bucket (3). The front end of the slag skimming bucket (3) is an open end. A cover plate (301) is hinged to the rear end of the slag skimming bucket (3). A bent spring (302) is fixedly connected between the cover plate (301) and the top of the slag skimming bucket (3).

8. The processing equipment for the secondary spheroidizing process of a high-nickel austenitic ductile iron valve stem nut according to claim 7, characterized in that: When the cleaning push plate (7) performs the cleaning work, it can push the cover plate (301) to open. Uniformly distributed cleaning brushes (701) are fixedly connected to the side wall of the cleaning push plate (7). A push rod (702) is fixedly connected to the back of the cleaning push plate (7). A telescopic rack (703) is fixedly connected to the end of the push rod (702). When the cleaning work is carried out, the telescopic rack (703) is meshed and connected with the toothed disc (604).

9. The processing equipment for the secondary spheroidizing process of a high-nickel austenitic ductile iron valve stem nut as described in claim 8, characterized in that: The left inner wall of the support frame (2) is fixedly connected with a first support ring (202) and a second support ring (203). The telescopic rack (703) and the push rod (702) respectively slide through the first support ring (202) and the second support ring (203). A collar (801) is sleeved on the support frame (2) through a bearing, and a bottom plate (8) is fixed to the outer wall of the collar (801) by bolts.

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