Aluminum rod processing and its manufacturing process

Abstract

This invention discloses an aluminum rod processing and production process, relating to the field of aluminum-based alloy technology, including the following steps: S1, Raw material pretreatment: Preheating the crushed aluminum particles using a pretreatment device to form a regulated centralized preheating airflow, and simultaneously conveying it to a melting furnace to form an aluminum alloy melt; S2, Melt purification: A refining agent is conveyed to the bottom of the aluminum alloy melt using a rotary internal and external dual-channel blowing method, wherein a mixture of the refining agent and high-purity nitrogen is conveyed through the internal channel. This aluminum rod processing and production process uses a regulated centralized preheating airflow to preheat the crushed aluminum particles, achieving uniform preheating of the aluminum particles, avoiding oxidation caused by localized overheating, and effectively removing moisture and impurities adsorbed on the surface of the aluminum particles, reducing the generation of gas and oxide inclusions during subsequent melting.

Description

Technical Field

[0001] This invention relates to the field of aluminum-based alloy technology, and in particular to an aluminum rod processing and manufacturing process. Background Technology

[0002] Alloys with aluminum as the base and a certain amount of other alloying elements are one type of lightweight metal material.

[0003] For example, the patent entitled "A High Conductivity Aluminum Alloy Rod and Its Preparation Method" (patent application number: CN201910861146.8) discloses a high conductivity aluminum alloy rod and its preparation method. By adding the rare earth element lanthanum, the alloy melt can be purified, removing hydrogen and some impurity elements from the melt, reducing the scattering of electrons by hydrogen and impurity elements, and reducing defects in the material. However, the preparation process of this aluminum alloy rod lacks a preheating step, which means that the moisture and dust adsorbed on the surface of the raw materials cannot be effectively removed before melting, thereby increasing the hydrogen content and oxide inclusions in the melt. This is not conducive to the subsequent deep purification of the melt by rare earth elements and affects the processing quality.

[0004] Therefore, it is necessary to propose an aluminum rod processing and production process to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide an aluminum rod processing and production process to solve the problem that the lack of a preheating step in the preparation process of aluminum alloy rods leads to the inability to effectively remove moisture and dust adsorbed on the surface of the raw materials before melting, thereby increasing the hydrogen content and oxide inclusions in the melt and hindering the subsequent deep purification of the melt by rare earth elements.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an aluminum rod processing and manufacturing process, comprising the following steps: S1. Raw material pretreatment: The pretreatment equipment forms a regulated centralized preheating airflow to preheat the crushed aluminum particles and simultaneously conveys them to the melting furnace to form an aluminum alloy melt. S2. Melt purification: A rotary dual-channel spray method is used to deliver refining agent to the bottom of the aluminum alloy melt. The inner channel delivers a mixture of refining agent and high-purity nitrogen, while the outer channel delivers pure nitrogen to form a protective air curtain and an air-floating lubricating layer. The weight of the refining agent accounts for 0.2% to 0.6% of the total weight of the aluminum alloy melt, and the purification treatment time is 10 to 15 minutes. S3. Slag Removal: Use a slag remover to remove aluminum slag from the surface of the molten aluminum alloy, followed by heat preservation and settling. S4. Online Refining: The furnace body is tilted so that the aluminum alloy melt flows through the flow channel to the crystallizer. An Al-5Ti-1B alloy rod, accounting for 0.2% to 0.8% of the total weight of the aluminum alloy melt, is added in the middle of the flow channel to refine the aluminum alloy melt online. Simultaneously, the titanium and boron composition in the aluminum alloy melt is adjusted using the Al-5Ti-1B alloy rod to: titanium 0.01% to 0.04%, boron 0.002% to 0.008%. S5. Forming process: The aluminum alloy melt is continuously cast in a wheel to form an aluminum alloy ingot, which is then rolled into an aluminum rod and annealed.

[0007] Preferably, in step S1, the preheating temperature is controlled between 120 and 200°C.

[0008] Preferably, in S4, the inner and outer dual channels are coaxially arranged double-layer tube structures with a rotation speed of 200-400 r / min, and the flow rate of pure nitrogen gas transported by the outer tube is 1.3-1.6 times the flow rate of the mixture of refining agent and high-purity nitrogen gas in the inner tube; The purity of the high-purity nitrogen gas is ≥99.99%, and the refining agent is a non-toxic and silicon-free refining agent.

[0009] Preferably, in step S1, the preheating temperature is controlled between 120 and 200°C.

[0010] Preferably, in S4, the inner and outer dual channels are coaxially arranged double-layer pipe structures, and the flow rate of pure nitrogen transported by the outer pipe is 1.3 to 1.6 times the flow rate of the mixture of refining agent and high-purity nitrogen in the inner pipe; The purity of the high-purity nitrogen gas is ≥99.99%, and the refining agent is a non-toxic and silicon-free refining agent.

[0011] Preferably, the pretreatment equipment includes a shaft tube rotating on a preheating pipe, the shaft tube having multiple inner channels evenly distributed along its axis, and a cavity segment corresponding to and communicating with the inner channels installed on the outside of the shaft tube, the multiple cavity segments forming a auger for conveying, and the sidewalls of the cavity segments having side holes for outputting gas. The preheating pipe is equipped with a connecting pipe that connects to the shaft pipe. The lower half of the connecting pipe has a fan-shaped channel that alternately cooperates with multiple inner channels. The connecting pipe has a first and second arm that are arranged in an X-shape near the shaft tube. When the ends of the first and second arms retract, the connection area between the pipe and the inner channel is reduced, and the preheating feeding area of ​​the aluminum particles is also reduced.

[0012] Preferably, an arm plate is fixedly connected to the side of the second arm near the shaft tube, and the two sides of the arm plate are respectively attached to the shaft tube and the first arm. An arm block is fixedly connected to the side of the first arm near the shaft tube, and the arm block is attached to the shaft tube.

[0013] Preferably, the diameter of the circle containing the arm plate is greater than the inner diameter of the shaft tube.

[0014] Preferably, the top of the preheating pipe is connected to a feed box, and guide plates are slidably arranged on both sides of the feed box. The ends of the two guide plates that are close to each other are inclined downwards, and the two guide plates are respectively hinged to the top ends of the first support arm and the second support arm.

[0015] Preferably, the inner channel is fan-shaped.

[0016] Preferably, the top of the preheating pipe is provided with a suction assembly for suctioning gas and impurities. The suction assembly includes a suction chamber, a suction groove, and a suction pipe, wherein the suction pipe is connected to the negative pressure suction pipe of the factory.

[0017] Preferably, the side hole is inclined and tilted towards the shaft tube direction.

[0018] The technical effects and advantages of this invention are as follows: This invention employs a regulated centralized preheating airflow to preheat crushed aluminum particles, achieving uniform preheating and preventing oxidation caused by localized overheating. Simultaneously, it effectively removes adsorbed moisture and impurities from the surface of the aluminum particles, reducing the generation of gas and oxide inclusions during subsequent smelting, thus laying the foundation for purity control of the alloy melt. Furthermore, the preheating treatment reduces melting energy consumption after the aluminum particles enter the smelting furnace, shortens melting time, and improves smelting efficiency. It also reduces thermal shock caused by excessive temperature differences between the aluminum particles and the high-temperature melt in the furnace, protecting the furnace wall and extending equipment lifespan. This invention employs a dual-channel internal and external conveying method to purify the alloy melt, achieving a synergistic effect between the refining agent and the protective gas. The pure nitrogen protective gas curtain in the outer tube can comprehensively cover the surface of the melt, effectively isolating it from air, preventing secondary oxidation caused by contact between the melt and oxygen, reducing the formation of oxide inclusions, and ensuring the purity of the melt. At the same time, high-purity nitrogen can enhance the dispersibility of the refining agent, improve purification efficiency, shorten purification time, and the gas film formed by nitrogen can reduce the friction between the nozzle and the melt, extending the equipment life. By setting up structures such as fan channels and cavity segments, the preheating gas is directly sprayed out and acts on the aluminum particles. The combination of the two tumbling methods ensures that the aluminum particles can be fully preheated, while facilitating the gas to flow upward and be discharged after contacting the aluminum particles. This invention achieves the matching of gas injection parameters with aluminum particle flow rate by opening and closing the first and second arms, solving the problems of gas waste at low flow rates and insufficient gas at high flow rates, and improving thermal energy utilization and preheating uniformity. By setting up structures such as guide plates, the feed flow rate and jet parameters can be adjusted synchronously. When the material flow rate is low, the air intake is reduced to concentrate energy; when the material flow rate is high, the air intake is increased to ensure coverage. The operation is convenient and the preheating effect is guaranteed. The side holes are angled so that the preheating gas is directed toward the shaft tube, which can better act on the aluminum particles and make the agitation of the aluminum particles more obvious. The diameter of the circle containing the arm plate is larger than the inner diameter of the shaft tube, which allows the arm plate to close the inner passage that rotates to the top of the shaft tube. Attached Figure Description

[0019] Figure 1 This is a flowchart illustrating the aluminum rod processing and manufacturing process of the present invention.

[0020] Figure 2 This is a schematic diagram of the preprocessing equipment of the present invention from one perspective.

[0021] Figure 3 For the present invention Figure 2 Enlarged schematic diagram of the structure at point A in the middle.

[0022] Figure 4 This is a schematic diagram of the preprocessing equipment of the present invention from another perspective.

[0023] Figure 5 For the present invention Figure 4 Enlarged schematic diagram of the structure at point B.

[0024] Figure 6 This is a schematic diagram of the preheating pipe and shaft tube structure of the present invention.

[0025] Figure 7 For the present invention Figure 6 Enlarged schematic diagram of the structure at point C.

[0026] Figure 8 For the present invention Figure 6 Enlarged schematic diagram of the structure at point D.

[0027] Figure 9 For the present invention Figure 6 Enlarged schematic diagram of the structure at point E in the middle.

[0028] Figure 10 This is a schematic diagram of the inner frame and inner channel structure of the present invention.

[0029] Figure 11 This is a schematic diagram of the shaft tube and auger plate structure of the present invention.

[0030] Figure 12 This is a schematic diagram of the first and second arms of the present invention.

[0031] Figure 13 This is a schematic diagram of the arm block and arm plate structure of the present invention.

[0032] Figure 14 This is a schematic diagram of the second arm and arm plate structure of the present invention.

[0033] Figure 15This is a schematic diagram of the feed box and guide plate structure of the present invention.

[0034] In the diagram: 1. Preheating pipe; 2. Shaft tube; 201. Inner frame; 202. Inner channel; 3. Connecting pipe; 301. Fixing block; 302. Fan channel; 303. Top channel; 4. Screwdriver plate; 401. Cavity segment; 5. Side hole; 6. Ring hole; 7. First arm; 701. Arm block; 8. Second arm; 801. Arm plate; 9. Arm rod; 10. Feed box; 11. Sliding channel; 12. Guide plate; 13. Connecting plate; 14. Horizontal plate; 15. Transmission bar; 16. Electric push rod; 17. Stabilizer; 18. Discharge box; 19. Suction chamber; 20. Suction groove; 21. Suction pipe; 22. Motor. Detailed Implementation

[0035] This invention provides, for example Figures 1-15 The aluminum rod processing and manufacturing process shown includes the following operational steps: Example 1

[0036] S1. Raw material pretreatment: Preheating the crushed aluminum particles by using a pretreatment equipment to form a regulated centralized preheating airflow, with the preheating temperature controlled at 120℃. S2, Melting and Alloying: The pretreated aluminum particles are transported to a melting furnace for melting at a melting temperature of 740°C. Other alloying elements besides titanium and boron, including iron, rare earth elements lanthanum, silicon, copper, gallium, magnesium, zinc, and manganese, are added to form an aluminum alloy melt and stir it. S3. Composition Adjustment: The composition of the melt is tested, analyzed and adjusted so that the content of each element by weight percentage is as follows: iron 0.4%, rare earth element lanthanum 0.02%, silicon ≤0.08%, copper ≤0.08%, gallium ≤0.08%, magnesium ≤0.08%, zinc ≤0.08%, manganese ≤0.08%, and the remainder is aluminum; S4. Melt Purification: A rotary dual-channel spray method is used to deliver refining agent to the bottom of the aluminum alloy melt. The inner channel delivers a mixture of refining agent and high-purity nitrogen, while the outer channel delivers pure nitrogen to form a protective air curtain and an air-floating lubricating layer. The weight of the refining agent accounts for 0.2% of the total weight of the aluminum alloy melt, and the purification treatment time is 10 minutes. The inner and outer tubes are coaxially arranged, with both extending downwards and forming bends at the bottom to align the nozzle outlets horizontally. The inner tube carries a mixture of refining agent and high-purity nitrogen, using centrifugal force and horizontal jet kinetic energy to disperse the refining agent deep into the melt. The outer tube carries pure nitrogen, forming a protective air curtain and air-floating lubrication layer around the nozzle. The system is driven by an external drive device with a motor at a speed of 200 r / min, and the flow rate of pure nitrogen carried by the outer tube is 1.3 times that of the refining agent and high-purity nitrogen mixture in the inner tube. The purity of the high-purity nitrogen gas is ≥99.99%, and the refining agent is a non-toxic and silicon-free refining agent; S5. Slag Removal: After the aluminum alloy melt purification process is completed, the temperature is controlled at 740℃ and the settling time is 10 minutes, so that the aluminum slag floats to the surface of the aluminum alloy melt and is removed from the surface of the aluminum alloy melt using a slag remover. S6. Heat preservation and static treatment: The aluminum alloy melt is heat-preserved and static at a temperature of 740℃ for 30 minutes. S7. Online Refining: The furnace body is tilted so that the aluminum alloy melt flows through the flow channel to the crystallizer. An Al-5Ti-1B alloy rod, accounting for 0.2% of the total weight of the aluminum alloy melt, is added in the middle of the flow channel to refine the aluminum alloy melt online. At the same time, the titanium and boron composition in the aluminum alloy melt is adjusted by the Al-5Ti-1B alloy rod to be: titanium 0.01% and boron 0.002%. S8. Continuous casting process: The aluminum alloy molten material is continuously cast by wheel to form an aluminum alloy continuous casting ingot. S9. Rolling process: The aluminum alloy continuous casting ingot is rolled into an aluminum rod with a diameter of 9mm. The inlet temperature of the aluminum alloy ingot is controlled at 450℃ and the outlet temperature is controlled at 300℃. S10 Annealing treatment: The aluminum rod is annealed at 300℃ for 24 hours.

[0037] In this embodiment, the aluminum rod has a conductivity of 62.5 IACS, a tensile strength of 110 MPa, a yield strength of 35 MPa, and an elongation of 38%.

[0038] Example 2

[0039] S1. Raw material pretreatment: Preheating the crushed aluminum particles by using a pretreatment equipment to form a regulated centralized preheating airflow, with the preheating temperature controlled at 160℃. S2, Melting and Alloying: The pretreated aluminum particles are transported to a melting furnace for melting at a melting temperature of 760°C. Other alloying elements besides titanium and boron, including iron, rare earth elements lanthanum, silicon, copper, gallium, magnesium, zinc, and manganese, are added to form an aluminum alloy melt and stir it. S3. Composition Adjustment: The composition of the melt is tested, analyzed and adjusted so that the content of each element by weight percentage is as follows: iron 0.7%, rare earth element lanthanum 0.11%, silicon ≤0.08%, copper ≤0.08%, gallium ≤0.08%, magnesium ≤0.08%, zinc ≤0.08%, manganese ≤0.08%, and the remainder is aluminum; S4. Melt Purification: A rotary dual-channel spray method is used to deliver refining agent to the bottom of the aluminum alloy melt. The inner channel delivers a mixture of refining agent and high-purity nitrogen, while the outer channel delivers pure nitrogen to form a protective air curtain and an air-floating lubricating layer. The weight of the refining agent accounts for 0.4% of the total weight of the aluminum alloy melt, and the purification treatment time is 12.5 minutes. The inner and outer tubes are coaxially arranged, with both extending downwards and forming bends at the bottom to direct the nozzle outlets horizontally. The inner tube carries a mixture of refining agent and high-purity nitrogen, using centrifugal force and horizontal jet kinetic energy to disperse the refining agent deep into the melt. The outer tube carries pure nitrogen, forming a protective air curtain and air-floating lubrication layer around the nozzle. The system is driven by an external drive device with a motor at a speed of 300 r / min, and the flow rate of pure nitrogen carried by the outer tube is 1.45 times that of the mixture of refining agent and high-purity nitrogen carried by the inner tube. The purity of the high-purity nitrogen gas is ≥99.99%, and the refining agent is a non-toxic and silicon-free refining agent; S5. Slag Removal: After the aluminum alloy melt purification process is completed, the temperature is controlled at 760℃ and the settling time is 12.5 minutes, so that the aluminum slag floats to the surface of the aluminum alloy melt and the slag on the surface of the aluminum alloy melt is removed with a slag remover. S6. Heat preservation and static treatment: The aluminum alloy melt is heat-preserved and static at a temperature of 760℃ for 45 minutes. S7. Online Refining: The furnace body is tilted so that the aluminum alloy melt flows through the flow channel to the crystallizer. An Al-5Ti-1B alloy rod, accounting for 0.5% of the total weight of the aluminum alloy melt, is added in the middle of the flow channel to refine the aluminum alloy melt online. At the same time, the titanium and boron composition in the aluminum alloy melt is adjusted by the Al-5Ti-1B alloy rod to be: titanium 0.025% and boron 0.005%. S8. Continuous casting process: The aluminum alloy molten material is continuously cast by wheel to form an aluminum alloy continuous casting ingot. S9. Rolling process: The aluminum alloy continuous casting ingot is rolled into an aluminum rod with a diameter of 9.5mm. The inlet temperature of the aluminum alloy ingot is controlled at 500℃ and the outlet temperature is controlled at 325℃. S10 Annealing treatment: The aluminum rod is annealed at 350℃ for 24 hours.

[0040] In this embodiment, the aluminum rod has a conductivity of 63.0 IACS, a tensile strength of 115 MPa, a yield strength of 38 MPa, and an elongation of 39%.

[0041] Example 3

[0042] S1. Raw material pretreatment: Preheating the crushed aluminum particles by using a pretreatment equipment to form a regulated centralized preheating airflow, with the preheating temperature controlled at 200℃. S2, Melting and Alloying: The pretreated aluminum particles are transported to a melting furnace for melting at a melting temperature of 780°C. Other alloying elements besides titanium and boron, including iron, rare earth elements lanthanum, silicon, copper, gallium, magnesium, zinc, and manganese, are added to form an aluminum alloy melt and stir it. S3. Composition Adjustment: The composition of the melt is tested, analyzed and adjusted so that the content of each element by weight percentage is as follows: iron 1.0%, rare earth element lanthanum 0.2%, silicon ≤0.08%, copper ≤0.08%, gallium ≤0.08%, magnesium ≤0.08%, zinc ≤0.08%, manganese ≤0.08%, and the remainder is aluminum; S4. Melt Purification: A rotary dual-channel spray method is used to deliver refining agent to the bottom of the aluminum alloy melt. The inner channel delivers a mixture of refining agent and high-purity nitrogen, while the outer channel delivers pure nitrogen to form a protective air curtain and an air-floating lubricating layer. The weight of the refining agent accounts for 0.6% of the total weight of the aluminum alloy melt, and the purification treatment time is 15 minutes. The inner and outer channels are coaxially arranged, with both extending downwards and forming bends at the bottom, so that the nozzle outlets at the bottom face horizontally. The inner channel transports a mixture of refining agent and high-purity nitrogen, using rotational centrifugal force and horizontal jet kinetic energy to disperse the refining agent deep into the melt. The outer channel transports pure nitrogen, forming a protective air curtain and air-floating lubrication layer around the nozzle. The system is driven by an external drive device with a drive motor at a speed of 400 r / min, and the flow rate of pure nitrogen transported by the outer channel is 1.6 times that of the mixture of refining agent and high-purity nitrogen in the inner channel. The purity of the high-purity nitrogen gas is ≥99.99%, and the refining agent is a non-toxic and silicon-free refining agent; S5. Slag Removal: After the aluminum alloy melt purification process is completed, the temperature is controlled at 780℃ and the settling time is 15 minutes, so that the aluminum slag floats to the surface of the aluminum alloy melt and the slag on the surface of the aluminum alloy melt is removed with a slag remover. S6. Heat preservation and static treatment: The aluminum alloy melt is heat-preserved and static at a temperature of 780℃ for 60 minutes. S7. Online Refining: The furnace body is tilted so that the aluminum alloy melt flows through the flow channel to the crystallizer. An Al-5Ti-1B alloy rod, accounting for 0.8% of the total weight of the aluminum alloy melt, is added in the middle of the flow channel to refine the aluminum alloy melt online. At the same time, the titanium and boron composition in the aluminum alloy melt is adjusted by the Al-5Ti-1B alloy rod to be: titanium 0.04% and boron 0.008%. S8. Continuous casting process: The aluminum alloy molten material is continuously cast by wheel to form an aluminum alloy continuous casting ingot. S9. Rolling process: The aluminum alloy continuous casting ingot is rolled into an aluminum rod with a diameter of 10mm. The inlet temperature of the aluminum alloy ingot is controlled at 550℃ and the outlet temperature is controlled at 350℃. S10 Annealing treatment: The aluminum rod is annealed at a temperature of 400℃ for 24 hours.

[0043] In this embodiment, the aluminum rod has a conductivity of 62.0 IACS, a tensile strength of 120 MPa, a yield strength of 40 MPa, and an elongation of 37%.

[0044] In this invention, a regulated centralized preheating airflow is used to preheat the crushed aluminum particles, achieving uniform preheating of the particles and avoiding oxidation caused by local overheating. Simultaneously, it effectively removes moisture and impurities adsorbed on the surface of the aluminum particles, reducing the generation of gas and oxide inclusions during subsequent melting, thus laying the foundation for purity control of the alloy melt. Furthermore, the preheating treatment reduces melting energy consumption after the aluminum particles enter the melting furnace, shortens melting time, and improves melting efficiency. It also reduces thermal shock caused by excessive temperature differences between the aluminum particles and the high-temperature melt in the melting furnace, protecting the inner wall of the melting furnace and extending the equipment's service life.

[0045] In this invention, a dual-channel internal and external conveying method is used to purify the alloy melt, achieving the synergistic effect of refining agent and protective gas. This effectively isolates the melt from air, prevents secondary oxidation caused by contact between the melt and oxygen, reduces the formation of oxide inclusions, and ensures the purity of the melt. At the same time, high-purity nitrogen can enhance the dispersibility of the refining agent, improve purification efficiency, shorten purification time, and the gas film formed by nitrogen can reduce the friction between the nozzle and the melt, extending the equipment life.

[0046] The pretreatment equipment includes a preheating pipe 1, which has a certain length. The specific length can be flexibly set according to the production scale and pretreatment efficiency requirements, usually 2 to 2.5m, to ensure that the crushed aluminum particles have sufficient preheating time in the pipe and achieve uniform heating. The preheating pipe 1 is installed on a movable support frame (not shown in the figure). The bottom of the movable support frame is equipped with casters with braking function, which not only facilitates the flexible movement of the whole equipment and adapts to the layout adjustment of different production sites, but also fixes the position through the braking device during the operation of the equipment, ensuring the stability of the preheating pipe 1 and avoiding problems such as poor aluminum particle conveying and uneven preheating caused by equipment shaking.

[0047] The bottom of one end of the preheating pipe 1 is connected to the discharge box 18. In actual use, the bottom of the discharge box 18 faces the melting furnace, so that the pretreated aluminum particles can directly enter the interior of the melting furnace. The top of the other end of the preheating pipe 1 is connected to the feed box 10, which is used to feed the crushed aluminum particles into the preheating pipe 1. The feed can be assisted by a conveyor with a conveyor belt or by manual feeding.

[0048] A shaft tube 2 is rotatably mounted on the preheating pipe 1, and the shaft tube 2 is concentrically distributed with the preheating pipe 1. One end of the shaft tube 2 near the feed box 10 extends to the outside of the preheating pipe 1. An inner frame 201 is fixedly installed inside the shaft tube 2, and the inner frame 201 is distributed along the axial direction of the shaft tube 2. The inner frame 201 divides the interior of the shaft tube 2 into multiple inner channels 202, which are evenly distributed along the axis of the shaft tube 2 and are fan-shaped. Figure 10 The inner frame 201 divides the interior of the shaft tube 2 into three inner channels 202.

[0049] Multiple cavity segments 401 are fixedly installed on the outside of the shaft tube 2. The cavity segments 401 are located inside the preheating pipe 1. The multiple cavity segments 401 are connected end to end to form a screw conveyor 4 for conveying. A ring hole 6 is opened on the side of the cavity segment 401 near the shaft tube 2. The inner cavity of the cavity segment 401 is connected to the corresponding inner channel 202 through the ring hole 6. A side hole 5 is opened on the side wall of the cavity segment 401. The side hole 5 is connected to the inner cavity of the cavity segment 401 for outputting preheated gas.

[0050] A motor 22 is fixedly connected to the outer wall of the shaft tube 2. One end of the shaft tube 2 near the discharge box 18 is fixedly connected to the drive shaft of the motor 22. The motor 22 is connected to the factory's power supply. When the motor 22 runs, it drives the shaft tube 2 and the auger plate 4 to rotate, conveying the aluminum particles from the feed box 10 to the discharge box 18.

[0051] Specifically, when preheating gas enters only one of the inner channels 202, the preheating gas will enter the cavity segment 401 connected to it and be ejected from the side hole 5, while the side holes 5 at other positions will not eject preheating gas.

[0052] A filter screen is fixedly installed inside the side hole 5 to prevent aluminum particles from entering the inner cavity of the cavity segment 401 through the side hole 5.

[0053] In addition, the cavity segment 401 near the discharge box 18 may not have an inner cavity to avoid affecting the discharge. This can be adjusted according to the specific usage.

[0054] Considering that during the preheating process, aluminum particles mainly concentrate in the lower half of the preheating pipe 1 due to their own gravity, in order to ensure the agitation effect of the aluminum particles and improve the utilization efficiency of the preheating gas, a stabilizer 17 is fixedly installed on the outside of the preheating pipe 1. A connecting pipe 3 is fixedly installed on the stabilizer 17. The connecting pipe 3 remains fixed and is concentrically distributed with the shaft pipe 2. The ends of the connecting pipe 3 and the shaft pipe 2 that are close to each other are in contact with each other. The end of the connecting pipe 3 that is away from the shaft pipe 2 is connected to the preheating gas conveying pipe of the factory, which is used to convey gas into the interior of the shaft pipe 2 through the connecting pipe 3. The gas flow rate is appropriate and can drive the aluminum particles to agitate.

[0055] The upper half of the inside of the connector 3 is fixedly connected to a fixing block 301. A fan channel 302 is formed between the fixing block 301 and the inner wall of the connector 3. The fan channel 302 is located at the bottom of the connector 3 and is fan-shaped. When the shaft tube 2 rotates, multiple inner channels 202 are connected and cooperated with the fan channel 302 in turn.

[0056] Specifically, the crushed aluminum particles enter the preheating pipe 1. The motor 22 drives the shaft tube 2 and the auger plate 4 to rotate, conveying the aluminum particles from the feed box 10 to the discharge box 18. The particles rotate to the inner channel 202 in the lower half of the preheating pipe 1, which connects with the fan channel 302. Preheating gas enters the inner channel 202 through the fan channel 302 and enters the corresponding cavity segment 401. These multiple cavity segments 401 are concentrated in the lower half of the preheating pipe 1 and come into contact with the aluminum particles. Then, they are sprayed out from the side hole 5 and act directly on the aluminum particles, causing them to tumble. Combined with the rotation and conveying of the auger plate 4, the two tumbling methods ensure that the aluminum particles are fully preheated. The cavity segments 401 in the upper half of the preheating pipe 1 do not spray preheating gas from their corresponding side holes 5, thus avoiding the dispersion of gas force and facilitating the upward flow and discharge of gas after contact with the aluminum particles.

[0057] In summary, by setting up structures such as the fan channel 302 and the cavity segment 401, the preheating gas is directly sprayed out and acts on the aluminum particles. The combination of the two tumbling methods ensures that the aluminum particles can be fully preheated, while facilitating the upward flow and discharge of the gas after contact with the aluminum particles.

[0058] The side hole 5 is located at the edge of the cavity segment 401 away from the shaft tube 2. The side hole 5 is inclined and tilted towards the shaft tube 2. When the cavity segment 401 rotates to the lower half of the preheating pipe 1, preheating gas is ejected from the corresponding side hole 5. This gas is directed towards the shaft tube 2, which acts better on the aluminum particles, making the agitation of the aluminum particles more obvious.

[0059] To facilitate gas flow within the preheating pipe 1 and promptly remove dust and other contaminants, a suction assembly for drawing in gas and dust impurities is installed at the top of the preheating pipe 1. This assembly includes a suction chamber 19, a suction trough 20, and a suction pipe 21. The suction chamber 19 is located inside the wall at the top of the preheating pipe 1. The suction trough 20 is located on the inner wall at the top of the preheating pipe 1 and communicates with the suction chamber 19. Multiple suction troughs 20 are evenly distributed. The suction pipe 21 is fixedly installed at the top of the preheating pipe 1 and communicates with the suction chamber 19. The top of the suction pipe 21 is connected to the factory's negative pressure suction pipe for timely removal of gas and impurities. A filter screen is fixedly installed inside the suction trough 20 to prevent aluminum particles from being drawn away.

[0060] During the preheating stage, the gas and impurities inside the preheating pipe 1 are drawn out by the extraction pipe 21, the extraction chamber 19, and the extraction groove 20 to ensure the gas flow inside the preheating pipe 1.

[0061] In actual use, a circulation mechanism, including a filter box, an electric heating plate, a pump body, etc., can be set between the extraction pipe 21 and the connection pipe 3 to realize the circulation of preheated gas. The mechanism can be adjusted according to the specific usage.

[0062] The preheating pipe 1 is wrapped with an insulation cotton layer to achieve the purpose of heat preservation.

[0063] Considering that aluminum particles may have different humidity levels due to storage factors, when the aluminum particles to be transported have a certain humidity, the flow rate of the aluminum particles inside the preheating pipe 1 needs to be reduced to ensure sufficient drying and preheating. When the aluminum particles to be transported are relatively dry, the flow rate of the aluminum particles inside the preheating pipe 1 can be increased. In order to adjust the transport range of the preheating gas according to the flow rate of the aluminum particles inside the preheating pipe 1, a rod 9 is fixedly connected to one end of the connecting pipe 3 near the shaft pipe 2. The rod 9 is concentric with the shaft pipe 2. The first arm 7 and the second arm 8 are rotatably distributed in an X-shape on the rod 9. The top of the connecting pipe 3 is provided with a top channel 303 for the first arm 7 and the second arm 8 to slide and extend. The length of the first arm 7 and the second arm 8 above the rod 9 is relatively large.

[0064] A fan-shaped connecting channel is formed between the bottom ends of the first arm 7 and the second arm 8, and the size of the connecting channel is adjustable; when the bottom ends of the first arm 7 and the second arm 8 are closed, the area of ​​the connecting channel is reduced; when the bottom ends of the first arm 7 and the second arm 8 are opened to both sides, the area of ​​the connecting channel is expanded.

[0065] When the flow rate of aluminum particles in the preheating pipe 1 is low, the bottom ends of the first arm 7 and the second arm 8 are retracted. At this time, the opening of the fan-shaped connecting channel between the fan channel 302 and the inner channel 202 narrows. As the shaft tube 2 continues to rotate, the time it takes for the inner channel 202 to rotate to the bottom and connect with the narrowed connecting channel becomes shorter, resulting in a reduction in the jetting time within a single rotation cycle of the corresponding side hole 5. This design allows the preheating gas to concentrate on the core area where a small number of aluminum particles are located, avoiding energy waste caused by gas diffusion and ensuring that the gas kinetic energy is fully utilized to achieve powerful tumbling.

[0066] Conversely, when the flow rate of aluminum particles in preheating pipe 1 is large, the first arm 7 and the second arm 8 are opened to both sides. At this time, the opening of the fan-shaped connecting channel expands, the duration of communication between the inner channel 202 and the heat source increases, the jetting time of the side hole 5 increases, and the effective range of the gas expands accordingly. This effectively covers the thickened material layer, ensuring that a large number of aluminum particles can fully contact the hot airflow during the conveying process, achieving uniform preheating.

[0067] This invention achieves the matching of gas injection parameters with aluminum particle flow rate by opening and closing the first arm 7 and the second arm 8, solving the problems of gas waste at low flow rates and insufficient gas at high flow rates, and improving thermal energy utilization and preheating uniformity.

[0068] Meanwhile, sliding channels 11 are provided on both sides of the feed box 10. Guide plates 12 are slidably arranged inside the sliding channels 11. The ends of the two guide plates 12 that are close to each other are inclined downward. The tops of the first support arm 7 and the second support arm 8 are both hinged with connecting plates 13. The end of the connecting plate 13 that is away from the first support arm 7 or the second support arm 8 is hinged to the corresponding guide plate 12.

[0069] An electric push rod 16 is fixedly installed at the end of the preheating pipe 1. A horizontal plate 14 is fixedly installed on the telescopic end of the electric push rod 16. Both ends of the horizontal plate 14 are hinged with transmission bars 15. The end of the transmission bar 15 away from the horizontal plate 14 is hinged to the first support arm 7 or the second support arm 8; see reference. Figure 4 When the telescopic end of the electric push rod 16 extends, the horizontal plate 14 moves upward, and through the transmission bar 15, it drives the top ends of the first arm 7 and the second arm 8 to retract, and the two guide plates 12 move closer to each other inside the feed box 10.

[0070] The electric actuator 16 is connected to the factory's power supply.

[0071] Specifically, when the bottom ends of the first arm 7 and the second arm 8 retract, the top ends of the first arm 7 and the second arm 8 retract accordingly, causing the two guide plates 12 to move closer to each other inside the feed box 10. At this time, the effective feed cross-sectional area at the bottom of the feed box 10 is reduced, which limits the falling speed of the aluminum particles, thereby reducing the flow rate of aluminum particles entering the preheating pipe 1.

[0072] Conversely, when the bottom ends of the first arm 7 and the second arm 8 open to both sides, their top ends open simultaneously, causing the two guide plates 12 to move away from each other. At this time, the effective feeding cross-sectional area at the bottom of the feed box 10 expands, and the aluminum particles fall smoothly, thereby increasing the flow rate of aluminum particles entering the preheating pipe 1.

[0073] By setting up structures such as guide plates 12, the feed flow rate and jet parameters can be adjusted synchronously. When the material flow rate is low, the air intake is reduced to concentrate energy; when the material flow rate is high, the air intake is increased to ensure coverage. The operation is convenient and the preheating effect is guaranteed.

[0074] In addition, when blockage occurs in the feed box 10, the guide plate 12 moves back and forth, which can also achieve the effect of unblocking.

[0075] To ensure the closing effect at the first arm 7 and the second arm 8, an arm plate 801 is fixedly connected to the side of the second arm 8 near the shaft tube 2. The two sides of the arm plate 801 are respectively attached to the shaft tube 2 and the first arm 7. The arm plate 801 is a circular plate structure with a fan-shaped notch. The diameter of the circle containing the arm plate 801 is larger than the inner diameter of the shaft tube 2, allowing the arm plate 801 to close the inner channel 202 rotated to the top of the shaft tube 2. An arm block 701 is fixedly connected to the side of the first arm 7 near the shaft tube 2. The arm block 701 is attached to the shaft tube 2, and is located at the bottom of the first arm 7 near the second arm 8 (see reference). Figure 13 This ensures stable airflow through the fan-shaped connecting channel; in actual use, wear-resistant rubber gaskets are installed at positions such as arm block 701 and arm plate 801 to ensure the sealing of the connection between shaft tube 2 and pipe tube 3.

Claims

1. An aluminum rod processing method and its manufacturing process, characterized in that, The following steps are included: S1. Raw material pretreatment: The pretreatment equipment forms a regulated centralized preheating airflow to preheat the crushed aluminum particles and simultaneously conveys them to the melting furnace to form an aluminum alloy melt. S2. Melt purification: A rotary dual-channel spray method is used to deliver refining agent to the bottom of the aluminum alloy melt. The inner channel delivers a mixture of refining agent and high-purity nitrogen, while the outer channel delivers pure nitrogen to form a protective air curtain and an air-floating lubricating layer. The weight of the refining agent accounts for 0.2% to 0.6% of the total weight of the aluminum alloy melt, and the purification treatment time is 10 to 15 minutes. S3. Slag Removal: Use a slag remover to remove aluminum slag from the surface of the molten aluminum alloy, followed by heat preservation and settling. S4. Online Refining: The furnace body is tilted so that the aluminum alloy melt flows through the flow channel to the crystallizer. An Al-5Ti-1B alloy rod, accounting for 0.2% to 0.8% of the total weight of the aluminum alloy melt, is added in the middle of the flow channel to refine the aluminum alloy melt online. Simultaneously, the titanium and boron composition in the aluminum alloy melt is adjusted using the Al-5Ti-1B alloy rod to: titanium 0.01% to 0.04%, boron 0.002% to 0.008%. S5. Forming process: The aluminum alloy melt is continuously cast in a wheel to form an aluminum alloy ingot, which is then rolled into an aluminum rod and annealed.

2. The aluminum rod processing and manufacturing process according to claim 1, characterized in that, In S1, the preheating temperature is controlled between 120 and 200°C.

3. The aluminum rod processing and manufacturing process according to claim 1, characterized in that, In S4, the inner and outer dual channels are coaxially arranged double-layer tube structures with a rotation speed of 200-400 r / min. The flow rate of pure nitrogen gas transported by the outer tube is 1.3-1.6 times the flow rate of the mixture of refining agent and high-purity nitrogen gas in the inner tube. The purity of the high-purity nitrogen gas is ≥99.99%, and the refining agent is a non-toxic and silicon-free refining agent.

4. The aluminum rod processing and manufacturing process according to claim 1, characterized in that, The pretreatment equipment includes a shaft tube (2) that rotates on a preheating pipe (1). The shaft tube (2) has multiple inner channels (202) evenly distributed along its axis inside. A cavity segment (401) corresponding to and communicating with the inner channel (202) is installed on the outside of the shaft tube (2). The multiple cavity segments (401) form a screw conveyor (4) for conveying. The side wall of the cavity segment (401) has a side hole (5) for outputting gas. The preheating pipe (1) is provided with a connecting pipe (3) that connects to the shaft pipe (2). The lower half of the connecting pipe (3) has a fan (302) that alternately cooperates with multiple inner channels (202). The connecting pipe (3) has a first arm (7) and a second arm (8) that are arranged in an X-shape near the shaft tube (2). When the ends of the first arm (7) and the second arm (8) are retracted, the connection area between the pipe (3) and the inner channel (202) is reduced, and the preheating feeding area of ​​the aluminum particles is also reduced.

5. The aluminum rod processing and manufacturing process according to claim 4, characterized in that, The second arm (8) is fixedly connected to an arm plate (801) on the side near the shaft tube (2), and the two sides of the arm plate (801) are respectively attached to the shaft tube (2) and the first arm (7). The first arm (7) is fixedly connected to an arm block (701) on the side near the shaft tube (2), and the arm block (701) is attached to the shaft tube (2).

6. The aluminum rod processing and manufacturing process according to claim 5, characterized in that, The diameter of the circle containing the arm plate (801) is greater than the inner diameter of the shaft tube (2).

7. The aluminum rod processing and manufacturing process according to claim 4, characterized in that, The top of the preheating pipe (1) is connected to the feed box (10), and guide plates (12) are slidably arranged on both sides of the feed box (10). The two guide plates (12) are inclined downward at the ends that are close to each other, and the two guide plates (12) are respectively hinged to the top of the first arm (7) and the second arm (8).

8. The aluminum rod processing and manufacturing process according to claim 4, characterized in that, The inner channel (202) is fan-shaped.

9. The aluminum rod processing and manufacturing process according to claim 4, characterized in that, The top of the preheating pipe (1) is provided with a suction assembly for suctioning gas and impurities. The suction assembly includes a suction chamber (19), a suction groove (20), and a suction pipe (21), wherein the suction pipe (21) is connected to the negative pressure suction pipe of the factory.

10. The aluminum rod processing and manufacturing process according to claim 4, characterized in that, The side hole (5) is inclined and tilted toward the shaft tube (2).

Images