Production line and production process of recycled aluminum alloy

Abstract

The application provides a production line and a production process of a recycled aluminum alloy, and relates to the technical field of aluminum alloy production lines.The production line comprises a smelting furnace, a runner, a distributor, a mold conveyor belt, a refining furnace 1 and a refining furnace 2.The outlet of the smelting furnace is connected with a total runner, the total runner is branched into two branch runners which are respectively connected to the refining furnace 1 and the refining furnace 2, the outlets of the refining furnace 1 and the refining furnace 2 are respectively connected to the runner through outflow channels, a bypass flow channel is arranged between the outlet of the refining furnace 1 and the refining furnace 2, and a gate is arranged on each flow channel.The application adopts the design of double refining furnaces and flow channels, freely selects the use of the double furnaces according to the different grades of the aluminum alloy, is more flexible, reduces the burning loss rate, can be used for the production of various aluminum alloys containing silicon, copper, magnesium and the like, improves the production efficiency when the double refining furnaces are used in parallel, and significantly improves the demolding rate through the transmission of the vibration combined force by knocking the diagonal position.

Description

Technical Field

[0001] This application relates to the field of aluminum alloy production line technology, and in particular to a production line for recycled aluminum alloy and its production process. Background Technology

[0002] Recycled aluminum alloys are aluminum alloys mainly obtained by remelting, refining, and batching scrap aluminum and aluminum alloy materials. The aluminum ingots produced by the smelting production line have alloying elements added in the refining furnace. Recycled aluminum is an important reuse link after aluminum recycling, and most aluminum can be reused through this method, resulting in high resource recycling value.

[0003] The invention patent application with publication number CN103938001A discloses a production process for recycled aluminum, including the following steps: waste aluminum pre-processing, firstly sorting waste aluminum into waste aluminum material, and the generated waste aluminum material, pure aluminum, and block aluminum enter the next process together; batching, selecting and calculating the amount of each material; roughing, preheating the batched waste aluminum material through a preheating kiln and then sending it into a smelting furnace for smelting; refining, introducing the aluminum solution in the smelting furnace into a refining purification furnace through a guide channel for refining; casting, casting the refined aluminum solution into shape and demolding to generate aluminum ingots.

[0004] Regarding the aforementioned technologies, the alloying elements added to aluminum alloys vary depending on the grade. Traditionally, a single refining furnace is used to add the materials. If the melting point difference between the alloying elements is too large, the requirements for the order of adding materials and temperature control are high, which can easily lead to the burning off of low-melting-point metals. On the other hand, since the size of refining furnaces is generally smaller than that of smelting furnaces, the production efficiency is insufficient. Summary of the Invention

[0005] This application provides a production line for recycled aluminum alloy and its production process, which adopts a dual refining furnace design. The dual refining furnaces can be used separately, or they can be used in series or in parallel, which is more flexible, reduces the burn-off rate, and improves production efficiency when used in parallel.

[0006] This application provides a production line for recycled aluminum alloys, which adopts the following technical solution: A production line for recycled aluminum alloy includes a smelting furnace, a gating system, a distributor, a mold conveyor belt, and two refining furnaces. The heights of the smelting furnace, refining furnace one, and refining furnace two decrease sequentially. The outlet of the smelting furnace is connected to a main flow channel, which branches into two branch flow channels that are respectively connected to refining furnace one and refining furnace two. The outlets of refining furnace one and refining furnace two are respectively connected to the gating system through outlet flow channels. A bypass flow channel is also provided between the outlet of refining furnace one and refining furnace two. Each flow channel is equipped with a gate, and each furnace has a furnace door at its inlet and outlet positions.

[0007] By adopting the above technical solution, a dual refining furnace is used. The use of the two furnaces can be freely selected according to the different grades of aluminum alloys. The opening and closing of the corresponding flow channels are controlled by the gate, and the entry and exit of aluminum liquid in the corresponding furnace is controlled by the furnace door. The refining furnace can be switched to three states: refining furnace one or refining furnace two used alone, refining furnace one or refining furnace two connected in series, and refining furnace one and refining furnace two used in parallel. Alloy elements are added into the corresponding refining furnace, and after melting, they are mixed to form aluminum alloy.

[0008] Optionally, the mold conveyor belt includes a track frame, sprockets, a chain, and a mold body fixed to each link of the chain. The chain forms a ring, and the sprockets cooperate with the chain for transmission. The sprockets are driven by a motor.

[0009] By adopting the above technical solution, each mold body moves with the corresponding chain link, and the empty mold body returns from the bottom of the conveyor belt to the beginning of the mold conveyor belt, realizing cyclical and continuous production.

[0010] Optionally, rollers are rotatably sleeved on each hinge axis of the chain, and the rollers make rolling contact with the track frame.

[0011] By adopting the above technical solution, friction is reduced through rolling contact, allowing the conveyor belt to be driven to move even when it is very long.

[0012] Optionally, the end of the mold conveyor belt is provided with a striking mechanism. The striking mechanism includes a bracket, a striking rod one and a striking rod two rotatably connected to the bracket. The striking rod one and the striking rod two correspond to the left and right ends of the front of the aluminum ingot, respectively. A cylinder one is hinged between the striking rod one and the bracket, and a cylinder two is hinged between the striking rod two and the bracket.

[0013] By adopting the above technical solution, when cylinder one extends and retracts, it drives the first striking rod to rotate, and when cylinder two extends and retracts, it drives the second striking rod to rotate, thereby demolding the aluminum ingot by striking it to vibrate.

[0014] Optionally, the inner side of the mold conveyor belt is provided with a cylinder three and a striking rod three driven by the cylinder three to slide. The inner side of the mold conveyor belt is also provided with a cylinder four and a striking rod four driven by the cylinder four to slide. The striking rod three and the striking rod four correspond to the left and right ends of the back of the mold body, respectively.

[0015] By adopting the above technical solution, through back-side auxiliary tapping and diagonal tapping, not only through vibration but also through force transmission, the aluminum ingot is slightly tilted, thereby achieving demolding and further increasing the probability of successful demolding.

[0016] Optionally, the bracket is rotatably connected to an arc-shaped rod, the lower end of which is bent toward the mold conveyor belt, and a spring telescopic rod is rotatably connected between the bracket and the arc-shaped rod.

[0017] By adopting the above technical solution, the aluminum ingot after demolding is supported by the arc-shaped rod, which avoids damage caused by long-distance drops. The spring telescopic rod gives the arc-shaped rod a buffering capacity, providing a cushioning effect when the aluminum ingot falls to the inside of the arc-shaped rod.

[0018] Optionally, a heater is provided at the starting end of the mold conveyor belt, and the heater is directly opposite the mold body.

[0019] By adopting the above technical solution, the heater is used to preheat the mold body, avoiding the danger caused by excessive temperature difference between the molten aluminum and the mold body.

[0020] Secondly, this application provides a production process for recycled aluminum alloys, employing the following technical solution: A process for producing recycled aluminum alloy, using the aforementioned production line for recycled aluminum alloy, includes the following steps: Step S1: Melt the scrap aluminum in the smelting furnace; Step S2: According to the aluminum alloy grade, open and close the gate of the corresponding flow channel to switch between three states: refining furnace one or refining furnace two used alone, refining furnace one or refining furnace two connected in series, and refining furnace one and refining furnace two used in parallel. Add alloy element ingredients into the corresponding refining furnace. Step S3: The refined molten aluminum flows through the gating system and distributor onto the mold conveyor belt; Step S4: As the mold conveyor belt is conveyed backward, the molten aluminum solidifies into aluminum ingots. Step S5: Tap the aluminum ingot at the end of the mold conveyor belt to remove it.

[0021] By adopting the above technical solution, aluminum alloy ingots can be produced using a dual refining furnace, with the choice of which furnace to use depending on the grade of the aluminum alloy.

[0022] Optionally, in step S5, the left and right ends of the front of the aluminum ingot are struck separately, but not simultaneously. When striking one end of the front, the other end of the back of the mold body is struck at the same time.

[0023] By adopting the above technical solution, the aluminum ingot is slightly tilted by striking it at a diagonal position, which not only causes vibration but also transmits force, thereby achieving demolding and ensuring successful demolding.

[0024] In summary, this application includes at least one of the following beneficial technical effects: 1. The design of dual refining furnaces and flow channels allows for flexible selection of the dual furnaces depending on the grade of aluminum alloy, thus reducing burn-off rate; 2. The two refining furnaces are used in parallel to refine simultaneously, and they converge at the entrance of the gating system to improve production efficiency; 3. By striking the aluminum ingot at a diagonal position, not only through vibration but also through the transmission of force, a slight tilt is caused, thereby achieving demolding and significantly improving the demolding rate. Attached Figure Description

[0025] Figure 1 This is a top view schematic diagram of a production line for recycled aluminum alloy according to an embodiment; Figure 2 This is a partial view of the mold conveyor belt in an embodiment; Figure 3 This is a perspective view of the striking mechanism in the embodiment; Figure 4 This is a perspective view of striking rod three and striking rod four in the embodiment; Figure 5 This is a schematic diagram illustrating the timing of the knocking demolding in an embodiment.

[0026] Explanation of reference numerals in the attached drawings: 1. Melting furnace; 21. Refining furnace one; 22. Refining furnace two; 3. Sprue; 31. Distributor; 4. Mold conveyor belt; 11. Main runner; 12. Branch runner; 23. Bypass runner; 24. Outlet runner; 41. Track frame; 42. Sprocket; 43. Chain; 44. Mold body; 45. Motor one; 46. Roller; 5. Heater; 6. Striking mechanism; 61. Support; 62. Striking rod one; 63. Striking rod two; 64. Cylinder one; 65. Cylinder two; 66. Arc rod; 67. Spring telescopic rod; 71. Cylinder three; 72. Striking rod three; 73. Cylinder four; 74. Striking rod four. Detailed Implementation

[0027] The following description, in conjunction with the accompanying drawings, provides a more detailed explanation of this application. After the addition of alloying elements, the product is an aluminum alloy, which, for ease of description, will still be referred to as molten aluminum or aluminum ingot.

[0028] Example 1:

[0029] Reference Figure 1 This embodiment discloses a production line for recycled aluminum alloy, including a smelting furnace 1, a refining furnace 21, a refining furnace 22, a gating system 3, a distributor 31, and a mold conveyor belt 4. The height of the smelting furnace 1, refining furnace 21, and refining furnace 22 decreases sequentially to facilitate the backward flow of molten aluminum through each flow channel by gravity. The smelting furnace 1 is used for smelting waste aluminum and outputting molten aluminum. The capacity of the smelting furnace 1 is significantly larger than that of the refining furnace 21 and refining furnace 22.

[0030] The outlet of smelting furnace 1 is connected to a main flow channel 11, which branches into two branch flow channels 12, respectively connecting to refining furnace 1 21 and refining furnace 22. The outlets of refining furnace 1 21 and refining furnace 22 are respectively connected to the gating system 3 via outlet flow channels 24. A bypass flow channel 23 is also provided between the outlet of refining furnace 1 21 and refining furnace 22, allowing molten aluminum in refining furnace 1 21 to enter refining furnace 22 via the bypass flow channel 23. Each flow channel is equipped with a gate, and each furnace has a furnace door at its inlet and outlet positions. The gates control the opening and closing of the corresponding flow channels, and the furnace doors control whether molten aluminum enters or exits the corresponding furnace.

[0031] Reference Figure 1 and Figure 2 The mold conveyor belt 4 includes a track frame 41, sprockets 42, a chain 43, and a mold body 44 fixed to each link of the chain 43. The chain 43 forms a ring, and the sprockets 42 cooperate with the chain 43 for transmission. The sprockets 42 are driven by a motor 45. Rollers 46 are rotatably sleeved on each hinge shaft of the chain 43. The rollers 46 roll in contact with the track frame 41, reducing friction through rolling contact. The mold body 44 has slots for molten aluminum to enter. The mold conveyor belt 4 is tens of meters long and moves slowly. As the mold body 44 moves backward, the molten aluminum solidifies to form an aluminum ingot. The aluminum ingot inside the mold body 44 is demolded at the end of the mold conveyor belt 4, and the empty mold body 44 returns from the bottom of the conveyor belt to the beginning of the mold conveyor belt 4, realizing cyclical and continuous production.

[0032] Reference Figure 1 The distributor 31 is used to inject the molten aluminum in the sprue 3 into the mold body 44 of the mold conveyor belt 4. The distributor 31 is the prior art, with one inlet and multiple circumferentially distributed outlets. The distributor 31 is driven by a motor to rotate, which is synchronized with the moving speed of the mold conveyor belt 4, so that the molten aluminum flows into the mold body 44 from the outlets respectively.

[0033] A heater 5 is installed at the starting end of the mold conveyor belt 4, facing the mold body 44. The heater 5 is fixed to the ground and is used to preheat the mold body 44 to prevent excessive temperature difference between the molten aluminum and the mold body 44 from causing danger. The heater 5 is a burner type, which heats up quickly.

[0034] Reference Figure 3 and Figure 4A striking mechanism 6 is provided at the end of the mold conveyor belt 4 to demold the aluminum ingot. The striking mechanism 6 includes a bracket 61, a first striking rod 62 and a second striking rod 63 rotatably connected to the bracket 61, and the bracket 61 is fixed to the track frame 41. The first striking rod 62 and the second striking rod 63 correspond to the left and right ends of the front of the aluminum ingot, respectively. A first cylinder 64 is hinged between the first striking rod 62 and the bracket 61, and a second cylinder 65 is hinged between the second striking rod 63 and the bracket 61. When the first cylinder 64 extends or retracts, it drives the first striking rod 62 to rotate; when the second cylinder 65 extends or retracts, it drives the second striking rod 63 to rotate.

[0035] The striking point is located when the mold body 44 is rotated to a vertical position or tilted downwards. Striking rods 62 and 63 are drooping, with weights at their lower ends to increase the inertial hammering force. Cylinders 64 and 65 do not extend or retract simultaneously, allowing for separate striking of the left and right ends of the aluminum ingot's front side; the striking is not simultaneous. Vibration separates the aluminum ingot from the mold body 44, and striking from both ends separately improves the reliability of demolding.

[0036] A bracket 61 is rotatably connected to an arc-shaped rod 66. The lower end of the arc-shaped rod 66 bends towards the mold conveyor belt 4 and approaches the surface of the mold body 44. A spring-loaded telescopic rod 67 is rotatably connected between the bracket 61 and the arc-shaped rod 66. The arc-shaped rod 66 catches the aluminum ingot after demolding, preventing damage from long-distance drops. The spring-loaded telescopic rod 67 provides cushioning for the arc-shaped rod 66, offering a buffering effect when the aluminum ingot falls to the inside of the arc-shaped rod 66. A discharge conveyor belt (not shown in the figure) is also provided on the ground below the arc-shaped rod 66. The aluminum ingot falling from the bottom inside the arc-shaped rod 66 falls close to the discharge conveyor belt and is then discharged backward.

[0037] The inner side of the mold conveyor belt 4 is equipped with a cylinder 3 71 and a sliding striking rod 3 72 driven by the cylinder 3 71. The inner side of the mold conveyor belt 4 is also equipped with a cylinder 4 73 and a sliding striking rod 4 74 driven by the cylinder 4 73. The striking rods 3 72 and 4 74 correspond to the left and right ends of the back of the mold body 44, respectively. The cylinders 3 71 and 4 73 are both fixed to the track frame 41. The position of the striking rod 3 72 corresponds to the striking rod 1 62, and the position of the striking rod 4 74 corresponds to the striking rod 2 63.

[0038] The striking mechanism 6 operates on the following principle: the extension and retraction of the four cylinders are controlled by a controller, with cylinders 71 and 73 not extending and retracting simultaneously. While striking rod 62 strikes the aluminum ingot on the front of the mold body 44, striking rod 74 strikes the other end of the mold body 44 on the back. This diagonal striking, through vibration and force transmission, causes a slight tilting of the aluminum ingot, thus achieving demolding. After striking rods 62 and 74 have completed their strikes, striking rods 63 and 72 strike simultaneously to further ensure the aluminum ingot's demolding. The striking rods 72 and 74, driven by cylinders 71 and 73, increase the reliability of aluminum ingot demolding and prevent the ingot from failing to demold.

[0039] Example 2:

[0040] A process for producing recycled aluminum alloy, using a recycled aluminum alloy production line as described in Example 1, includes the following steps: Step S1: Melt the scrap aluminum in the smelting furnace 1.

[0041] Step S2: According to the aluminum alloy grade, switch the gate of the corresponding flow channel to switch between three states: using refining furnace 1 21 or refining furnace 22 alone, refining furnace 1 21 or refining furnace 22 in series, and refining furnace 1 21 and refining furnace 22 in parallel. Add alloying elements into the corresponding refining furnace, melt and mix to form aluminum alloy.

[0042] Specifically, refining furnace 21 is generally used for high-temperature refining, such as for silicon and copper, while refining furnace 22 is used for low-temperature refining, such as for magnesium. If the aluminum alloy grade only requires alloying elements with high melting points, refining furnace 21 is used alone; if the aluminum alloy grade only requires alloying elements with low melting points, refining furnace 22 is used alone; if the melting points of the alloying elements differ significantly, the molten aluminum output from refining furnace 21 is fed into refining furnace 22, cooled to a suitable temperature, and then the alloying elements are added to reduce the burn-off rate. If it is necessary to increase refining efficiency, the molten aluminum output from smelting furnace 1 is branched into refining furnace 21 and refining furnace 22 for simultaneous refining, and finally merges at the inlet of gating 3. It should be noted that in the scheme of simultaneous refining and merging, the composition of the molten aluminum output from refining furnace 21 and refining furnace 22 must be consistent.

[0043] Step S3: The refined molten aluminum flows through the gating system 3 and distributor 31 onto the mold conveyor belt 4. The heater 5 preheats the mold body 44 at the starting end of the mold conveyor belt 4, and the preheated mold body 44 carries the molten aluminum.

[0044] Step S4: During the backward conveying process of the mold conveyor belt 4, the molten aluminum solidifies into aluminum ingots.

[0045] Step S5: The aluminum ingot at the end of the mold conveyor belt 4 is knocked out. The knocking is automatically achieved by the knocking mechanism 6.

[0046] Reference Figure 5 In step S5, the left and right ends of the front side of the aluminum ingot are struck separately, but not simultaneously. While striking one end of the front side, the other end of the back side of the mold body 44 is also struck at the same time. By striking at the diagonal position, not only through vibration but also through the transmission of force, the aluminum ingot is slightly tilted, thereby achieving demolding and ensuring successful demolding.

[0047] In summary, this production line and its production process employ dual refining furnaces, allowing for flexible selection of the two furnaces based on the grade of the aluminum alloy. This approach reduces burn-off rate and improves production efficiency when used in parallel.

[0048] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A production line for recycled aluminum alloy, comprising a smelting furnace (1), a gating system (3), a distributor (31), and a mold conveyor belt (4), characterized in that: It also includes refining furnace one (21) and refining furnace two (22). The height of the smelting furnace (1), refining furnace one (21) and refining furnace two (22) decreases sequentially. The outlet of the smelting furnace (1) is connected to a main flow channel (11). The main flow channel (11) branches into two branch channels (12) which are respectively connected to refining furnace one (21) and refining furnace two (22). The outlets of refining furnace one (21) and refining furnace two (22) are respectively connected to the gating channel (3) through the outlet channel (24). A bypass flow channel (23) is also provided between the outlet of refining furnace one (21) and refining furnace two (22). Each flow channel is equipped with a gate. Each furnace has a furnace door at the inlet and outlet positions.

2. The production line for recycled aluminum alloy according to claim 1, characterized in that: The mold conveyor belt (4) includes a track frame (41), a sprocket (42), a chain (43), and a mold body (44) fixed on each link of the chain (43). The chain (43) forms a ring, and the sprocket (42) cooperates with the chain (43) for transmission. The sprocket (42) is driven by a motor (45).

3. The production line for recycled aluminum alloy according to claim 2, characterized in that: Rollers (46) are rotatably sleeved on each hinge shaft of the chain (43), and the rollers (46) are in rolling contact with the track frame (41).

4. The production line for recycled aluminum alloy according to claim 2, characterized in that: The end of the mold conveyor belt (4) is provided with a striking mechanism (6). The striking mechanism (6) includes a bracket (61), a striking rod one (62) rotatably connected to the bracket (61), and a striking rod two (63). The striking rod one (62) and the striking rod two (63) correspond to the left and right ends of the front of the aluminum ingot, respectively. A cylinder one (64) is hinged between the striking rod one (62) and the bracket (61), and a cylinder two (65) is hinged between the striking rod two (63) and the bracket (61).

5. The production line for recycled aluminum alloy according to claim 4, characterized in that: The inner side of the mold conveyor belt (4) is provided with a cylinder three (71) and a striking rod three (72) driven by the cylinder three (71). The inner side of the mold conveyor belt (4) is also provided with a cylinder four (73) and a striking rod four (74) driven by the cylinder four (73). The striking rod three (72) and the striking rod four (74) correspond to the left and right ends of the back of the mold body (44) respectively.

6. The production line for recycled aluminum alloy according to claim 4, characterized in that: The bracket (61) is rotatably connected to the arc-shaped rod (66), the lower end of the arc-shaped rod (66) is bent toward the mold conveyor belt (4), and a spring telescopic rod (67) is rotatably connected between the bracket (61) and the arc-shaped rod (66).

7. The production line for recycled aluminum alloy according to claim 2, characterized in that: The mold conveyor belt (4) is equipped with a heater (5) at the starting end, and the heater (5) is directly opposite the mold body (44).

8. A process for producing recycled aluminum alloy, using a production line for recycled aluminum alloy as described in any one of claims 1-7, characterized in that: Includes the following steps: Step S1: Melt the scrap aluminum in the smelting furnace (1); Step S2: According to the aluminum alloy grade, switch the gate of the corresponding flow channel to switch between three states: refining furnace one (21) or refining furnace two (22) used alone, refining furnace one (21) or refining furnace two (22) connected in series, and refining furnace one (21) and refining furnace two (22) used in parallel. Add alloy element materials into the corresponding refining furnace. Step S3: The refined molten aluminum flows through the gating system (3) and distributor (31) onto the mold conveyor belt (4); Step S4: During the backward conveying process of the mold conveyor belt (4), the molten aluminum solidifies into aluminum ingots; Step S5: Tap the aluminum ingot at the end of the mold conveyor belt (4) to remove it.

9. The production process of recycled aluminum alloy according to claim 8, characterized in that: In step S5, the left and right ends of the front of the aluminum ingot are struck separately, but not at the same time. When striking one end of the front, the other end of the back of the mold body (44) is struck at the same time.

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