A nanocrystalline master alloy production process and equipment

Abstract

The present invention relates to the field of metallurgical technology, in particular to a nanocrystalline master alloy production process and equipment thereof, and the specific steps are as follows: S1, select 69.421% pure iron, 9.167% metallic silicon, 11.296% ferroboron, 1.332% copper, and 8.784% low-aluminum ferroniobium; S2, add pure iron, ferroboron and low-aluminum ferroniobium into a smelting furnace, and evacuate the smelting furnace; the present invention provides a nanocrystalline master alloy production process, which achieves rapid cooling and easy protection of the master alloy by argon circulation during the cooling process, which can save time and improve efficiency, and can recycle argon, reduce argon consumption, and save production costs. At the same time, argon, as an inert gas, can further protect the master alloy melt from oxidation, and reduce the oxidation and erosion of the master alloy melt by gases such as oxygen and nitrogen.

Description

Technical Field

[0001] The invention relates to the technical field of metallurgy, and in particular to a nanocrystalline master alloy production process and equipment thereof. Background Art

[0002] Since nanocrystalline master alloy reacts with oxygen, nitrogen and other gases in the air when it is melted, causing the oxygen and nitrogen content of the product to increase and reducing the mechanical properties of the master alloy, most of the existing technologies heat and melt it in a vacuum environment. However, although the existing vacuum smelting can isolate the air to reduce the impurity content of the product, under vacuum conditions, the heat conduction medium is lost, the cooling time is long, and the production efficiency is reduced. Summary of the invention

[0003] The purpose of the present invention is to solve the disadvantage of low cooling efficiency of vacuum smelting nanocrystalline master alloy in the prior art, and to propose a nanocrystalline master alloy production process and equipment.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] Design a nanocrystalline master alloy production process, the specific steps are as follows:

[0006] S1, select pure iron 69.421%, metallic silicon 9.167%, ferroboron 11.296%, copper 1.332%, low aluminum ferroniobium 8.784%;

[0007] S2, adding pure iron, ferroboron and low-aluminum ferroniobium into a smelting furnace, and evacuating the smelting furnace;

[0008] S3, smelting pure iron, ferroboron and low-aluminum ferroniobium, smelting them to 1400℃-1600℃ and keeping the temperature constant for 10 minutes, turning off the power to cool down, and filling in circulating cold argon gas to accelerate the cooling speed and protect the melt until the temperature drops to 1200℃-1400℃;

[0009] S4, secondary feeding, continue to add metal silicon and copper to the smelting furnace, heat up to 1300℃-1500℃, keep the temperature constant for 10 minutes, turn off the power to cool down, and refill with circulating cold argon gas to speed up the cooling speed, and wait until the temperature drops to 1000℃-1250℃ to obtain alloy liquid;

[0010] S5, pouring the alloy liquid obtained in S4 into a mold, and taking it out of the furnace after cooling, to obtain the nanocrystalline mother alloy.

[0011] The present invention also provides a nanocrystalline master alloy production device, including a smelting furnace, the smelting furnace including a furnace body, an upper cover is provided on the top of the furnace body, an induction heating coil is hinged in the furnace body, a crucible is detachably mounted on the induction heating coil, a mechanical arm is provided in the furnace body to drive the induction heating coil to rotate, a furnace door is provided on the furnace body, a furnace cover is provided on the furnace door, a bracket is fixedly connected to the furnace cover for holding a mold, an exhaust valve is provided on one side of the furnace body, and a first connecting valve and a second connecting valve are provided on the other side to connect to a cooling system.

[0012] Preferably, the cooling system includes a cooling pipe and a water-cooling coil, one end of the cooling pipe is connected to the first connecting valve, and the other end is connected to the second connecting valve, an air pump is provided on the cooling pipe, and the water-cooling coil is wound around the cooling pipe.

[0013] Preferably, a cleaning mechanism is provided in the cooling pipe to clean the inner wall of the pipe, and the cleaning mechanism includes an annular base, an outer shell is coaxially fixedly connected to the annular base, a bearing seat is fixedly connected to the outer shell, a rotating shaft is rotatably mounted on the bearing seat, tires are fixedly connected to both ends of the rotating shaft, an annular ring is coaxially fixedly connected to the outer shell, and a plurality of scrapers are radially slidably fitted on the ring.

[0014] Preferably, a driving structure is provided in the shell to drive the tire to rotate, and the driving structure includes a first end face gear, a second end face gear and a short shaft, the short shaft is rotatably mounted on the shell, one end of the short shaft is fixedly connected to a driven gear, and the other end of the short shaft is fixedly connected to a first bevel gear, and the second bevel gear is fixedly connected to the rotating shaft, the first bevel gear matches the second bevel gear, the first end face gear and the second end face gear can both be slidably fitted in the shell, the first end face gear and the second end face gear are spaced apart, and the spacing between the first end face gear and the second end face gear is greater than the outer diameter length of the driven gear, and the first end face gear and the second end face gear can both match the driven gear.

[0015] Preferably, a ball seat is rotatably mounted coaxially on the annular base, a keyway is provided on the ball seat, key bars are fixedly connected to both the first end face gear and the second end face gear, the key bar can be slidably fitted in the keyway, a mounting groove is provided on the ball seat, a connecting shaft is rotatably mounted in the mounting groove, a spherical shell with a thin-walled structure is rotatably fitted in the ball seat, the connecting shaft is fixedly connected to the spherical shell, and the fan blades are coaxially fixed in the spherical shell.

[0016] Preferably, a lifting structure is provided in the mounting groove to drive the first end face gear and the second end face gear to slide in the outer shell, and the lifting structure includes a sliding rod and a rack, the sliding rod is fixed on the mounting groove, and both ends of the rack are fixed with magnetic connectors, the magnetic connector at one end of the rack is fixed to the first end face gear, and the magnetic connector at the other end of the rack is fixed to the second end face gear, the magnetic connector can be slidably fitted on the sliding rod, and a structural transmission gear is fixed on the connecting shaft, and the rack matches the transmission gear.

[0017] Preferably, a first wedge-shaped limiting groove and a second wedge-shaped limiting groove are spaced apart on the sliding rod, a compression spring is fixedly connected to the rack, a wedge-shaped limiting block is fixedly connected to the compression spring, and both the first limiting groove and the second limiting groove cooperate with the limiting block.

[0018] Preferably, a sliding block is fixedly connected to the second end face gear, an inclined sliding groove is provided on the scraper, and the sliding block can be slidably fitted in the inclined sliding groove.

[0019] Preferably, a first permanent magnet is fixedly connected to the top inner wall of the cooling pipe, and a second permanent magnet is fixedly connected to the bottom inner wall of the cooling pipe. Both the first permanent magnet and the second permanent magnet generate repulsive magnetic forces with the magnetic connector.

[0020] The present invention provides a nanocrystalline master alloy production process and equipment, which has the following beneficial effects:

[0021] The present invention provides nanocrystalline master alloy production equipment, which enables a cleaning mechanism to perform linear reciprocating motion in the axial direction of a cooling pipe through the forward and reverse rotation of a tire. During the linear reciprocating motion, the cleaning mechanism drives a scraper to rotate through a ring, and the scraper rests against the inner wall of the cooling pipe during the rotation, thereby scraping and cleaning impurities attached to the inner wall of the cooling pipe to prevent the impurity layer from affecting the cooling effect inside the cooling pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the structure of a nanocrystalline master alloy production device proposed by the present invention Figure 1 .

[0023] Figure 2 A schematic diagram of the structure of a nanocrystalline master alloy production device proposed by the present invention Figure 2 .

[0024] Figure 3 This is a cross-sectional view of a nanocrystalline master alloy production device proposed by the present invention.

[0025] Figure 4 A nanocrystalline master alloy production device proposed by the present invention Figure 3 Enlarged view of point a in the middle.

[0026] Figure 5 A nanocrystalline master alloy production device proposed by the present invention Figure 4 Enlarged view of point C in the middle.

[0027] Figure 6 This is a schematic structural diagram of the coordination between a cleaning mechanism and a cooling pipeline of a nanocrystalline master alloy production device proposed by the present invention.

[0028] Figure 7 The present invention provides a schematic structural diagram of a cleaning mechanism for nanocrystalline master alloy production equipment.

[0029] Figure 8 This is a schematic diagram of the structure inside the shell of a nanocrystalline master alloy production device proposed by the present invention.

[0030] Fig. 9 This is a schematic structural diagram of the cooperation between the first end face gear and the second end face gear of a nanocrystalline master alloy production device proposed by the present invention.

[0031] Fig.10 This is a front view of a ball seat of a nanocrystalline master alloy production device proposed by the present invention.

[0032] Fig.11 A nanocrystalline master alloy production device proposed by the present invention Fig.10 Enlarged view of point A in the middle.

[0033] Fig.12 A nanocrystalline master alloy production device proposed by the present invention Fig.11 Enlarged view of point B in the middle.

[0034] Fig.13 This is a schematic structural diagram of the coordination between a ball shell and a ball seat of a nanocrystalline master alloy production device proposed by the present invention.

[0035] In the figure: 1. furnace body; 101. upper cover; 102. exhaust valve; 103. furnace door; 104. furnace cover; 105. mold; 106. crucible; 107. robot arm; 108. first connecting valve; 109. second connecting valve; 110. air pump; 111. induction heating coil; 112. bracket; 2. cooling pipe; 201. first permanent magnet; 202. second permanent magnet; 3. water cooling coil; 4. collecting pipe; 5. end cover; 6. annular base; 7. outer shell; 8. ball seat; 801. keyway; 802. installation Groove; 9, ball shell; 10, fan blade; 11, connecting shaft; 12, transmission gear; 13, slide rod; 14, rack; 15, magnetic connector; 16, first limit groove; 17, second limit groove; 18, compression spring; 19, limit block; 20, first end face gear; 21, second end face gear; 22, driven gear; 23, short shaft; 24, first bevel gear; 25, bearing seat; 26, rotating shaft; 27, second bevel gear; 28, tire; 29, ring; 30, scraper; 31, slide block; 32, inclined groove. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0037] Embodiment 1: A nanocrystalline master alloy production process, the specific steps are as follows:

[0038] S1, select pure iron 69.421%, metallic silicon 9.167%, ferroboron 11.296%, copper 1.332%, low aluminum ferroniobium 8.784%;

[0039] S2, adding pure iron, ferroboron and low-aluminum ferroniobium into a smelting furnace, and evacuating the smelting furnace;

[0040] S3, smelting pure iron, ferroboron and low-aluminum ferroniobium, smelting them to 1400℃-1600℃ and keeping the temperature constant for 10 minutes, turning off the power to cool down, and filling in circulating cold argon gas to accelerate the cooling speed and protect the melt until the temperature drops to 1200℃-1400℃;

[0041] S4, secondary feeding, continue to add metal silicon and copper to the smelting furnace, heat up to 1300℃-1500℃, keep the temperature constant for 10 minutes, turn off the power to cool down, and refill with circulating cold argon gas to speed up the cooling speed, and wait until the temperature drops to 1000℃-1250℃ to obtain alloy liquid;

[0042] S5, pouring the alloy liquid obtained in S4 into a mold, and taking it out of the furnace after cooling, to obtain the nanocrystalline mother alloy.

[0043] The present invention provides a nanocrystalline master alloy production process in which argon gas circulation is used during the cooling process to achieve rapid cooling and protect the master alloy, which can save time and improve efficiency, and can recycle argon gas, reduce argon gas consumption, and save production costs. At the same time, argon gas, as an inert gas, can further protect the master alloy melt from oxidation and reduce the oxidation and erosion of the master alloy melt by gases such as oxygen and nitrogen.

[0044] Embodiment 2: Figure 1-3 As shown, a nanocrystalline master alloy production equipment includes a smelting furnace, which includes a furnace body 1. An upper cover 101 is provided on the top of the furnace body 1. An induction heating coil 111 is hinged in the furnace body 1. A crucible 106 is detachably mounted on the induction heating coil 111. A mechanical arm 107 is provided in the furnace body 1 to drive the induction heating coil 111 to rotate. A furnace door 103 is provided on the furnace body 1. A furnace cover 104 is provided on the furnace door 103. A bracket 112 is fixedly connected to the furnace cover 104 for holding a mold 105. An exhaust valve 102 is provided on one side of the furnace body 1, and a first connecting valve 108 and a second connecting valve 109 are provided on the other side to connect to a cooling system.

[0045] In this embodiment, the smelting furnace performs smelting in the following steps:

[0046] Step 1: Open the upper cover 101, add pure iron, ferroboron and low-aluminum ferroniobium into the crucible 106 in the furnace body 1, and then close the upper cover 101;

[0047] Step 2: The first connecting valve 108 and the second connecting valve 109 are both closed, the exhaust valve 102 is opened, and the air in the furnace body 1 is extracted from the exhaust valve 102 by an exhaust device. When the furnace body 1 is in a vacuum state, the exhaust valve 102 is closed;

[0048] Step 3: After the induction heating coil 111 is powered on, the raw material in the crucible 106 is heated and melted. After melting to 1400° C.-1600° C., the temperature is kept constant for 10 minutes, and then the power is turned off to cool down;

[0049] Step 4: Open the first connecting valve 108 and the second connecting valve 109, and fill the furnace with circulating cold argon gas from the cooling system to accelerate the cooling speed;

[0050] Step 5: After the temperature drops to 1200° C.-1400° C., close the first connecting valve 108 and the second connecting valve 109 , open the upper cover 101 and add metal silicon and copper into the crucible 106 ;

[0051] Step 6: Close the upper cover 101, evacuate the interior of the furnace body 1 through the exhaust valve 102, and then close the exhaust valve 102;

[0052] Step 7: After the induction heating coil 111 is powered on, the crucible 106 is heated for a second time. After the temperature of the crucible 106 rises to 1300° C.-1500° C., the temperature is kept constant for 10 minutes.

[0053] Step 8: The induction heating coil 111 is powered off to cool down, and the first connecting valve 108 and the second connecting valve 109 are opened again, and circulating cold argon gas is filled into the furnace body through the cooling system to accelerate the cooling speed;

[0054] Step 9: After the temperature drops to 1000°C-1250°C, the alloy liquid in the crucible 106 is poured into the mold 105 through the robot arm 107. The cooling system continues to work. After the alloy liquid in the mold 105 is cooled and shaped, the furnace cover 104 is opened to take it out to obtain the nanocrystalline mother alloy.

[0055] like Figure 1-3 As shown, the cooling system includes a cooling pipe 2 and a water-cooling coil 3. One end of the cooling pipe 2 is connected to the first connecting valve 108, and the other end is connected to the second connecting valve 109. An air pump 110 is provided on the cooling pipe 2, and the water-cooling coil 3 is wound around the cooling pipe 2.

[0056] When the cooling system is working, the cold argon gas in the cooling pipe 2 is pumped into the furnace body 1 through the first connecting valve 108 by the air pump 110. After entering the furnace body 1, the cold argon gas absorbs the heat of the alloy liquid and heats up. After heating up in the furnace body 1, the cold argon gas becomes hot argon gas. After the cold argon gas in the cooling pipe 2 is pumped out, the pressure in the cooling pipe 2 is reduced, and the pressure in the furnace body 1 is increased after the cold argon gas is pumped into it. Under the action of pressure, the hot argon gas is sucked into the cooling pipe 2 from the furnace body 1 through the second connecting valve 109, thus forming a cycle.

[0057] After cold water is passed into the water-cooling coil 3, the cooling pipe 2 and the inside of the pipe can be cooled down. When the hot argon gas enters the cooling pipe 2, the water-cooling coil 3 will cool down the hot argon gas, thereby turning the hot argon gas into cold argon gas again.

[0058] Embodiment 3: Figure 3-7As shown, in the process of heating and melting pure iron, metallic silicon, ferroboron, copper and low-aluminum ferroniobium into alloy liquid in the crucible 106, part of the solid phase alloy or liquid phase alloy will be converted into gas phase under the action of high temperature, and the gas phase metal may enter the cooling pipe with the cold argon gas circulation. After cooling in the cooling pipe 2, the gas phase metal becomes liquid phase and adheres to the inner wall of the pipe. When the liquid phase metal on the inner wall of the pipe continues to release heat, it will be converted into solid phase. Over time, a layer of impurities will be formed in the cooling pipe 2, affecting the cooling efficiency and quality of the water-cooled coil 3 in the cooling pipe 2. Therefore, in this embodiment, a cleaning mechanism is provided in the cooling pipe 2 to clean the inner wall of the pipe, and the cleaning mechanism includes an annular base 6, a shell 7 is coaxially fixedly connected to the annular base 6, a bearing seat 25 is fixedly connected to the shell 7, a rotating shaft 26 is rotatably installed on the bearing seat 25, tires 28 are fixedly connected at both ends of the rotating shaft 26, and an annular ring 29 is coaxially fixedly connected to the shell 7, and a plurality of scrapers 30 are radially slidably matched on the ring 29.

[0059] The tires 28 are made of rubber material and have a certain deformation ability. A plurality of tires 28 distributed circumferentially on the housing 7 are tightly pressed against the inner wall of the cooling pipe 2 .

[0060] When the shaft 26 is driven to rotate, the shaft 26 drives the tire 28 to rotate. Since the tire 28 is against the inner wall of the cooling pipe 2, it will move axially along the cooling pipe 2 during the rotation of the tire 28, thereby driving the ring 29 to move axially inside the cooling pipe 2.

[0061] When the ring 29 rotates, the ring 29 drives the scraper 30 to rotate around the axis of the cooling pipe 2, so that the scraper 30 slides radially on the ring 29 until it rests against the inner wall of the cooling pipe 2. During the rotation of the ring 29, the scraper 30 scrapes off impurities attached to the inner wall of the cooling pipe 2 to prevent the impurity layer attached to the inner wall of the cooling pipe 2 from affecting the cooling effect.

[0062] like Figure 8-9 As shown, a driving structure is provided in the housing 7 to drive the tire 28 to rotate, and the driving structure includes a first end face gear 20, a second end face gear 21 and a short shaft 23. The short shaft 23 is rotatably mounted on the housing 7, one end of the short shaft 23 is fixedly connected to a driven gear 22, and the other end of the short shaft 23 is fixedly connected to a first bevel gear 24. A second bevel gear 27 is fixedly connected to the rotating shaft 26, and the first bevel gear 24 matches the second bevel gear 27. The first end face gear 20 and the second end face gear 21 are slidably matched in the housing 7, and the first end face gear 20 and the second end face gear 21 are spaced apart, and the spacing between the first end face gear 20 and the second end face gear 21 is greater than the outer diameter length of the driven gear 22, and the first end face gear 20 and the second end face gear 21 can match with the driven gear 22.

[0063] When the driven gear 22 rotates, the driven gear 22 drives the short shaft 23 to rotate, the short shaft 23 drives the first bevel gear 24 to rotate, the first bevel gear 24 drives the second bevel gear 27 to rotate, the second bevel gear 27 drives the shaft 26 to rotate, the shaft 26 rotates and drives the tire 28 to rotate. Since the tire 28 abuts against the inner wall of the cooling duct 2, the tire 28 moves in the cooling duct 2 during the rotation process. Based on the above, the first end face gear 20 and the second end face gear 21 can drive the tire 28 to rotate by driving the driven gear 22 to rotate.

[0064] like Figure 8-9 As shown, the first end face gear 20 and the second end face gear 21 are distributed on both sides of the driven gear 22. At this time, the first end face gear 20 and the second end face gear 21 are rotated in the same direction. In this state:

[0065] If the first end face gear 20 is meshed with the driven gear 22, the tire 28 will rotate forward, and the tire 28 will move downward on the inner wall of the cooling pipe 2;

[0066] If the second end face gear 21 is meshed with the driven gear 22, the tire 28 will be reversed and the tire 28 will move upward on the inner wall of the cooling pipe 2;

[0067] Based on this description, the forward and reverse rotation of the tire 28 , that is, the moving direction of the tire 28 on the inner wall of the cooling pipe 2 , can be controlled by controlling the meshing state of the first end face gear 20 and the second end face gear 21 with the driven gear 22 .

[0068] like Figure 4-5 and Figure 8-10 As shown, a ball seat 8 is rotatably installed coaxially on the annular base 6, a keyway 801 is provided on the ball seat 8, a key bar is fixedly connected to the first end face gear 20 and the second end face gear 21, the key bar can be slidably fitted in the keyway 801, a mounting groove 802 is provided on the ball seat 8, a connecting shaft 11 is rotatably installed in the mounting groove 802, a spherical shell 9 with a thin-walled structure is rotatably fitted in the ball seat 8, the connecting shaft 11 is fixedly connected to the spherical shell 9, and a fan blade 10 is coaxially fixed in the spherical shell 9.

[0069] When the cold argon gas in the cooling pipe 2 circulates, the airflow formed by the movement of the cold argon gas will drive the fan blades 10 to rotate, and the rotation of the fan blades 10 will drive the ball shell 9 to rotate. The rotation of the ball shell 9 will drive the ball seat 8 to rotate on the annular base 6 through the connecting shaft 11. Since the first end face gear 20 and the second end face gear 21 are connected to the ball seat 8 through the cooperation of the key bar and the key groove 801, when the ball seat 8 rotates, it will drive the first end face gear 20 and the second end face gear 21 to rotate in the same direction.

[0070] like Figure 9-11As shown, a lifting structure is provided in the mounting groove 802 to drive the first end face gear 20 and the second end face gear 21 to slide in the housing 7. The lifting structure includes a slide bar 13 and a rack 14. The slide bar 13 is fixed on the mounting groove 802. Both ends of the rack 14 are fixedly connected to magnetic connectors 15. A first permanent magnet 201 is fixedly connected to the top inner wall of the cooling pipe 2, and a second permanent magnet 202 is fixedly connected to the bottom inner wall of the cooling pipe 2. Both the first permanent magnet 201 and the second permanent magnet 202 generate repulsive magnetic forces with the magnetic connector 15. The magnetic connector 15 at one end of the rack 14 is fixedly connected to the first end face gear 20, and the magnetic connector 15 at the other end of the rack 14 is fixedly connected to the second end face gear 21. The magnetic connector 15 can be slidably matched on the slide bar 13. The transmission gear 12 is fixedly connected to the connecting shaft 11, and the rack 14 matches the transmission gear 12.

[0071] The first end gear 20 and the second end gear 21 are connected to the rack 14 via the magnetic connector 15 , so that the first end gear 20 , the second end gear 21 , the magnetic connector 15 and the rack 14 can be regarded as a whole.

[0072] When the tire 28 moves upward along the inner wall of the cooling pipe 2 to the highest point, at this time, the distance between the magnetic connector 15 and the first permanent magnet 201 is the smallest, and the magnetic force between the first permanent magnet 201 and the magnetic connector 15 is the largest. Under the action of the downward magnetic force applied to the magnetic connector 15 by the first permanent magnet 201, the magnetic connector 15 slides downward on the slide bar 13, and the magnetic connector 15 drives the first end face gear 20 to move downward synchronously, so that the first end face gear 20 is meshed with the driven gear 22. Based on the above description, it is known that "if the first end face gear 20 is meshed with the driven gear 22, the tire 28 will rotate forward, and the tire 28 will move downward on the inner wall of the cooling pipe 2 when it rotates forward", so after the first end face gear 20 is meshed with the driven gear 22, it will drive the tire 28 to move downward on the inner wall of the cooling pipe 2;

[0073] Similarly, it can be known that when the tire 28 moves downward along the inner wall of the cooling duct 2 to the lowest point, the distance between the magnetic connector 15 and the second permanent magnet 202 is the smallest. Under the action of the magnetic force between the second permanent magnet 202 and the magnetic connector 15, the second end face gear 21 will engage with the driven gear 22. Based on the known fact that "if the second end face gear 21 engages with the driven gear 22, the tire 28 will reverse and the tire 28 will move upward on the inner wall of the cooling duct 2", therefore, after the second end face gear 21 engages with the driven gear 22, it will drive the tire 28 to move upward on the inner wall of the cooling duct 2.

[0074] like Fig.13As shown, the magnetic connector 15 will drive the rack 14 to move synchronously during the sliding process on the slide rod 13. The rack 14 will drive the transmission gear 12 to rotate during the movement. The rotation of the transmission gear 12 will drive the connecting shaft 11 to rotate. The rotation of the connecting shaft 11 will drive the ball shell 9 to rotate in the ball socket 8. The rotation of the ball shell 9 in the ball socket 8 will drive the fan blades 10 to rotate around the connecting shaft 11. The rotation angle of the fan blades 10 is the same as the rotation angle of the transmission gear 12.

[0075] In this embodiment, the rack 14 drives the transmission gear 12 to rotate by 180 degrees, and the fan blade 10 will also rotate by 180 degrees, so that the upper and lower surfaces of the fan blade 10 are exchanged.

[0076] Due to the action of the air pump 110, the flow direction of the cold argon gas in the cooling pipe 2 is fixed, that is, the direction of the airflow formed by the flow of the cold argon gas is also fixed. The airflow in a fixed direction will only impact one side of the fan blade 10, while the other side is hardly impacted by the airflow. Since some gaseous metals are mixed in the airflow, metal impurities will form on the surface of the side of the fan blade 10 impacted by the airflow after long-term use, making the masses of the two sides of the fan blade 10 asymmetric, causing the fan blade 10 to vibrate greatly when rotating. In the present embodiment, the fan blade 10 is rotated 180 degrees with the connecting shaft 11 as the axis, so that both sides of the fan blade 10 can contact with the airflow, which ensures the symmetry of the masses on both sides of the fan blade 10 to a certain extent, thereby reducing the vibration sensation generated during the operation of the fan blade 10.

[0077] like Figure 10-12 As shown, a first wedge-shaped limiting groove 16 and a second wedge-shaped limiting groove 17 are spaced apart on the slide bar 13, a compression spring 18 is fixedly connected to the rack 14, a wedge-shaped limiting block 19 is fixedly connected to the compression spring 18, and both the first limiting groove 16 and the second limiting groove 17 cooperate with the limiting block 19.

[0078] When the magnetic connector 15 moves downward on the slide bar 13 under the magnetic force of the first permanent magnet 201, the rack 14 will also move downward, and the limit block 19 on the rack 14 will also move downward. When the magnetic connector 15 moves down to the point where the first end face gear 20 is meshed with the driven gear 22, the limit block 19 is just located in the second limit groove 17, thereby fixing the position of the rack 14, and the position of the first end face gear 20 connected to the rack 14 will also be fixed, thereby ensuring that the first end face gear 20 remains meshed with the driven gear 22.

[0079] Similarly, when the magnetic connector 15 moves upward on the slide bar 13 under the magnetic force of the second permanent magnet 202, the rack 14 will also move upward, and the limit block 19 on the rack 14 will also move upward. When the magnetic connector 15 moves up to the second end face gear 21 and engages with the driven gear 22, the limit block 19 is now located in the first limit groove 16, thereby fixing the position of the rack 14, and the position of the second end face gear 21 connected to the rack 14 will also be fixed, thereby ensuring that the second end face gear 21 and the driven gear 22 remain engaged.

[0080] like Figure 4-5 As shown, a sliding block 31 is fixedly connected to the second end face gear 21 , and an inclined sliding groove 32 is provided on the scraper 30 , and the sliding block 31 can be slidably fitted in the inclined sliding groove 32 .

[0081] When the second end face gear 21 moves vertically, it will drive the sliding block 31 to move synchronously. Since the sliding block 31 and the inclined slide groove 32 are slidably matched, when the sliding block 31 moves vertically, it will drive the scraper 30 to move horizontally, wherein:

[0082] When the sliding block 31 moves upward along with the second end face gear 21, the scraper 30 moves toward the axis direction of the ring 29, so that the scraper 30 is separated from the inner wall of the cooling pipe 2;

[0083] When the sliding block 31 moves downward along with the second end face gear 21 , the scraper 30 moves in a direction away from the axis of the ring 29 , so that the scraper 30 abuts against the inner wall of the cooling pipe 2 .

[0084] It is known that the inner wall of the cooling pipe 2 will be cleaned only when the scraper 30 is against the inner wall of the cooling pipe 2. It is also known that "if the second end face gear 21 is meshed with the driven gear 22, the tire 28 will reverse and the tire 28 will move upward on the inner wall of the cooling pipe 2". When the second end face gear 21 moves up to mesh with the driven gear 22, the scraper 30 is separated from the inner wall of the cooling pipe 2, and at this time the tire 28 moves upward on the inner wall of the cooling pipe 2. Therefore, when the tire 28 moves upward on the inner wall of the cooling pipe 2, the scraper 30 will not contact the inner wall of the pipe, thereby preventing the scraper 30 from bringing the liquid metal attached to the bottom of the inner wall of the cooling pipe 2 to the top of the inner wall.

[0085] like Figure 3 As shown, the bottom of the cooling pipe 2 is connected to a collecting pipe 4, and the bottom of the collecting pipe 4 is threaded with an end cover 5. When the scraper 30 cleans the inner wall of the cooling pipe 2, the cleaned impurities will fall into the collecting pipe 4 under the action of gravity. After the cooling system is finished working, the impurities in the collecting pipe 4 can be cleaned by opening the end cover 5.

[0086] Workflow and working principle:

[0087] The nanocrystalline master alloy includes the following components: 69.421% pure iron, 9.167% metallic silicon, 11.296% ferroboron, 1.332% copper, and 8.784% low-aluminum ferroniobium.

[0088] The heating and melting steps are as follows:

[0089] Step 1: Open the upper cover 101, add pure iron, ferroboron and low-aluminum ferroniobium into the crucible 106 in the furnace body 1, and then close the upper cover 101;

[0090] Step 2: The first connecting valve 108 and the second connecting valve 109 are both closed, the exhaust valve 102 is opened, and the air in the furnace body 1 is extracted from the exhaust valve 102 by an exhaust device. When the furnace body 1 is in a vacuum state, the exhaust valve 102 is closed;

[0091] Step 3: After the induction heating coil 111 is powered on, the raw material in the crucible 106 is heated and melted. After melting to 1400° C.-1600° C., the temperature is kept constant for 10 minutes, and then the power is turned off to cool down;

[0092] Step 4: Open the first connecting valve 108 and the second connecting valve 109, and fill the furnace with circulating cold argon gas from the cooling system to accelerate the cooling speed;

[0093] Step 5: After the temperature drops to 1200° C.-1400° C., close the first connecting valve 108 and the second connecting valve 109 , open the upper cover 101 and add metal silicon and copper into the crucible 106 ;

[0094] Step 6: Close the upper cover 101, evacuate the interior of the furnace body 1 through the exhaust valve 102, and then close the exhaust valve 102;

[0095] Step 7: After the induction heating coil 111 is powered on, the crucible 106 is heated for a second time. After the temperature of the crucible 106 rises to 1300° C.-1500° C., the temperature is kept constant for 10 minutes.

[0096] Step 8: The induction heating coil 111 is powered off to cool down, and the first connecting valve 108 and the second connecting valve 109 are opened again, and circulating cold argon gas is filled into the furnace body through the cooling system to accelerate the cooling speed;

[0097] Step 9: After the temperature drops to 1000°C-1250°C, the alloy liquid in the crucible 106 is poured into the mold 105 through the robot arm 107. The cooling system continues to work. After the alloy liquid in the mold 105 is cooled and shaped, the furnace cover 104 is opened to take it out to obtain the nanocrystalline mother alloy.

[0098] For the cooling system of the melting furnace:

[0099] When the cooling system is working, the cold argon gas in the cooling pipe 2 is pumped into the furnace body 1 through the first connecting valve 108 by the air pump 110. After entering the furnace body 1, the cold argon gas absorbs the heat of the alloy liquid and heats up. After heating up in the furnace body 1, the cold argon gas becomes hot argon gas. After the cold argon gas in the cooling pipe 2 is pumped out, the pressure in the cooling pipe 2 is reduced, and the pressure in the furnace body 1 is increased after the cold argon gas is pumped into it. Under the action of pressure, the hot argon gas is sucked into the cooling pipe 2 from the furnace body 1 through the second connecting valve 109, thus forming a cycle.

[0100] After cold water is passed into the water-cooling coil 3, the cooling pipe 2 and the inside of the pipe can be cooled down. When the hot argon gas enters the cooling pipe 2, the water-cooling coil 3 will cool down the hot argon gas, thereby turning the hot argon gas into cold argon gas again.

[0101] When the cold argon gas in the cooling pipe 2 circulates, the airflow formed by the movement of the cold argon gas will drive the fan blades 10 to rotate, and the rotation of the fan blades 10 will drive the ball shell 9 to rotate. The rotation of the ball shell 9 will drive the ball seat 8 to rotate on the annular base 6 through the connecting shaft 11. Since the first end face gear 20 and the second end face gear 21 are connected to the ball seat 8 through the cooperation of the key bar and the key groove 801, when the ball seat 8 rotates, it will drive the first end face gear 20 and the second end face gear 21 to rotate in the same direction, and the ring 29 will also rotate driven by the second end face gear 21.

[0102] Under the action of gravity, in the initial state, the cleaning mechanism is located at the bottom of the cooling pipe 2. At this time, the distance between the magnetic connector 15 and the second permanent magnet 202 is the smallest. Under the action of the magnetic force between the second permanent magnet 202 and the magnetic connector 15, the second end face gear 21 will mesh with the driven gear 22, and the second end face gear 21 will drive the driven gear 22 to rotate. The driven gear 22 will drive the short shaft 23 to rotate, and the short shaft 23 will drive the first bevel gear 24 to rotate. The first bevel gear 24 drives the second bevel gear 27 to rotate, and the second bevel gear 27 will drive the rotating shaft 26 to rotate. The rotation of the rotating shaft 26 will drive the tire 28 to reverse, that is, after the second end face gear 21 is meshed with the driven gear 22, it will drive the tire 28 to move upward on the inner wall of the cooling pipe 2.

[0103] When the second end face gear 21 moves upward, the sliding block 31 moves upward synchronously with the second end face gear 21, and the scraper 30 moves toward the axial direction of the ring 29, thereby separating the scraper 30 from the inner wall of the cooling pipe 2 to prevent the scraper 30 from bringing the liquid metal at the bottom to the top of the cooling pipe 2 during the upward movement.

[0104] When the tire 28 moves upward along the inner wall of the cooling pipe 2 to the highest point, the distance between the magnetic connector 15 and the first permanent magnet 201 is the smallest, and the magnetic force between the first permanent magnet 201 and the magnetic connector 15 is the largest. Under the action of the downward magnetic force applied to the magnetic connector 15 by the first permanent magnet 201, the magnetic connector 15 slides downward on the slide bar 13, and the magnetic connector 15 drives the first end face gear 20 to move downward synchronously, so that the first end face gear 20 is meshed with the driven gear 22. The first end face gear 20 drives the driven gear 22 to rotate, and the driven gear 22 will drive the short shaft 23 to rotate. The short shaft 23 drives the first bevel gear 24 to rotate. The first bevel gear 24 drives the second bevel gear 27 to rotate, and the second bevel gear 27, the second bevel gear 27 will drive the rotating shaft 26 to rotate, and the rotation of the rotating shaft 26 will drive the tire 28 to rotate forward, that is, after the first end face gear 20 is meshed with the driven gear 22, it will drive the tire 28 to move downward on the inner wall of the cooling pipe 2.

[0105] When the first end face gear 20 moves downward, the second end face gear 21 will be driven to move downward synchronously, and the sliding block 31 will move downward with the second end face gear 21. The scraper 30 will move in the direction away from the axis of the ring 29, so that the scraper 30 will be against the inner wall of the cooling pipe 2. Since the scraper 30 is driven by the ring 29 to rotate, when the cleaning mechanism moves downward along the cooling pipe 2 driven by the tire 28, the scraper 30 will rotate to clean the inner wall of the cooling pipe 2 from top to bottom.

[0106] When the magnetic connector 15 slides on the slide rod 13, it will drive the rack 14 to move synchronously. When the rack 14 moves, it will drive the transmission gear 12 to rotate. The rotation of the transmission gear 12 will drive the connecting shaft 11 to rotate. The rotation of the connecting shaft 11 will drive the ball shell 9 to rotate in the ball socket 8. The rotation of the ball shell 9 in the ball socket 8 will drive the fan blades 10 to rotate around the connecting shaft 11. The rotation angle of the fan blades 10 is the same as the rotation angle of the transmission gear 12.

[0107] In this embodiment, the rack 14 drives the transmission gear 12 to rotate at an angle of 180 degrees, and the fan blade 10 will also rotate 180 degrees, so that the upper and lower surfaces of the fan blade 10 are exchanged; under the action of the air pump 110, the flow direction of the cold argon gas in the cooling pipe 2 is fixed, that is, the direction of the airflow formed by the flow of the cold argon gas is also fixed, and the airflow in a fixed direction will only impact one side of the fan blade 10, while the other side is hardly impacted by the airflow. Since some gas phase metals are mixed in the airflow, metal impurities will form on the surface of the side of the fan blade 10 impacted by the airflow after long-term use, making the mass of the two sides of the fan blade 10 asymmetric, causing the fan blade 10 to produce greater vibration when rotating. In this embodiment, the fan blade 10 is rotated 180 degrees with the connecting shaft 11 as the axis, so that both sides of the fan blade 10 can contact the airflow, which ensures the symmetry of the mass on both sides of the fan blade 10 to a certain extent, thereby reducing the vibration generated during the operation of the fan blade 10.

[0108] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A nanocrystalline master alloy production process, characterized in that: The following steps are involved: S1, select pure iron 69.421%, metallic silicon 9.167%, ferroboron 11.296%, copper 1.332%, low aluminum ferroniobium 8.784%; S2. Add pure iron, ferroboron and low-aluminum ferroniobium into a smelting furnace, and evacuate the smelting furnace, wherein the smelting furnace comprises a furnace body (1), wherein an induction heating coil (111) is hingedly connected to the furnace body (1), and a crucible (106) is detachably mounted on the induction heating coil (111), wherein a mechanical arm (107) is arranged in the furnace body (1) to drive the induction heating coil (111) to rotate, and an exhaust valve (102) is arranged on one side of the furnace body (1), and a first connecting valve (108) and a second connecting valve (109) are arranged on the other side to connect to a cooling system; The cooling system comprises a cooling pipe (2) and a water-cooling coil (3); one end of the cooling pipe (2) is connected to a first connecting valve (108), and the other end is connected to a second connecting valve (109); an air pump (110) is provided on the cooling pipe (2); and the water-cooling coil (3) is wound around the cooling pipe (2); A cleaning mechanism is provided in the cooling pipe (2) to clean the inner wall of the pipe, the cleaning mechanism comprising an annular base (6), a housing (7) is coaxially fixedly connected to the annular base (6), a bearing seat (25) is fixedly connected to the housing (7), a rotating shaft (26) is rotatably mounted on the bearing seat (25), tires (28) are fixedly connected to both ends of the rotating shaft (26), an annular ring member (29) is coaxially fixedly connected to the housing (7), and a plurality of scrapers (30) are radially slidably fitted on the ring member (29); S3, smelting pure iron, ferroboron and low-aluminum ferroniobium, smelting them to 1400℃-1600℃ and keeping the temperature constant for 10 minutes, turning off the power to cool down, and filling in circulating cold argon gas to accelerate the cooling speed and protect the melt until the temperature drops to 1200℃-1400℃; S4, secondary feeding, continue to add metal silicon and copper to the smelting furnace, heat up to 1300℃-1500℃, keep the temperature constant for 10 minutes, turn off the power to cool down, and refill with circulating cold argon gas to speed up the cooling speed, and wait until the temperature drops to 1000℃-1250℃ to obtain alloy liquid; S5, pouring the alloy liquid obtained in S4 into a mold, and taking it out of the furnace after cooling, to obtain the nanocrystalline mother alloy.

2. The nanocrystalline master alloy production process according to claim 1, characterized in that: A driving structure is provided in the housing (7) to drive the tire (28) to rotate. The driving structure comprises a first end face gear (20), a second end face gear (21) and a short shaft (23). The short shaft (23) is rotatably mounted on the housing (7). One end of the short shaft (23) is fixedly connected to a driven gear (22), and the other end of the short shaft (23) is fixedly connected to a first bevel gear (24). The rotating shaft (26) is fixedly connected to a second bevel gear (27). The first bevel gear (24) matches the second bevel gear (27). The first end face gear (20) and the second end face gear (21) are slidably engaged in the housing (7). The first end face gear (20) and the second end face gear (21) are spaced apart, and the spacing between the first end face gear (20) and the second end face gear (21) is greater than the outer diameter length of the driven gear (22). The first end face gear (20) and the second end face gear (21) can be engaged with the driven gear (22).

3. The nanocrystalline master alloy production process according to claim 2, characterized in that: A ball seat (8) is coaxially rotatably mounted on the annular base (6), a keyway (801) is provided on the ball seat (8), a key bar is fixedly connected to both the first end face gear (20) and the second end face gear (21), the key bar is slidably engaged in the keyway (801), a mounting groove (802) is provided on the ball seat (8), a connecting shaft (11) is rotatably mounted in the mounting groove (802), a spherical shell (9) with a thin-walled structure is rotatably engaged in the ball seat (8), the connecting shaft (11) is fixedly connected to the spherical shell (9), and a fan blade (10) is coaxially fixedly connected in the spherical shell (9).

4. The nanocrystalline master alloy production process according to claim 3, characterized in that: A lifting structure is provided in the mounting groove (802) to drive the first end face gear (20) and the second end face gear (21) to slide in the housing (7), the lifting structure comprising a slide bar (13) and a rack (14), the slide bar (13) being fixed on the mounting groove (802), both ends of the rack (14) being fixedly connected to magnetic connectors (15), the magnetic connector (15) at one end of the rack (14) being fixedly connected to the first end face gear (20), and the magnetic connector (15) at the other end of the rack (14) being fixedly connected to the second end face gear (21), the magnetic connector (15) being slidably matched on the slide bar (13), the connecting shaft (11) being fixedly connected to a structural transmission gear (12), the rack (14) matching the transmission gear (12).

5. The nanocrystalline master alloy production process according to claim 4, characterized in that: The slide bar (13) is provided with a first wedge-shaped limiting groove (16) and a second wedge-shaped limiting groove (17) at intervals, the rack (14) is fixedly connected with a compression spring (18), the compression spring (18) is fixedly connected with a wedge-shaped limiting block (19), and both the first limiting groove (16) and the second limiting groove (17) are matched with the limiting block (19).

6. The nanocrystalline master alloy production process according to claim 5, characterized in that: A sliding block (31) is fixedly connected to the second end face gear (21), an inclined sliding groove (32) is provided on the scraper (30), and the sliding block (31) can be slidably engaged in the inclined sliding groove (32).

7. The nanocrystalline master alloy production process according to claim 6, characterized in that: A first permanent magnet (201) is fixedly connected to the top inner wall of the cooling pipe (2), and a second permanent magnet (202) is fixedly connected to the bottom inner wall of the cooling pipe (2); both the first permanent magnet (201) and the second permanent magnet (202) generate repulsive magnetic forces with the magnetic connector (15).

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