Aluminum melting furnace using flue gas waste heat to preheat scrap aluminum

Abstract

The present invention relates to the technical field of aluminum processing equipment, and in particular to an aluminum melting furnace that utilizes flue gas waste heat to preheat scrap aluminum. The present invention comprises: an aluminum melting furnace body, a heat conducting pipe, a conveying mechanism, a discharge hopper, a bag dust collector, and a dust removal fan; the present invention is provided with a hot gas recycling system which is a combination of the aluminum melting furnace, the conveying mechanism, and the bag dust collector, so that the smoke and heat generated in the combustion process are introduced into the conveying mechanism, and the heat is recycled. In order to separate the working spaces of the feeder and the slag scraper used in the auxiliary aluminum melting furnace, thereby improving work efficiency, the present invention is also provided with a discharge mechanism and a conveying mechanism for combined use. The bracket of the discharge mechanism is relatively high and space is reserved in front of the bracket to ensure the normal operation of the slag scraper. The conveying mechanism is arranged on the side of the furnace body, and the feeder can directly put the aluminum material into the feeding port of the conveying mechanism. In this way, the operating spaces of the two devices are separated, so operations can be carried out simultaneously, thereby improving work efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of aluminum processing equipment, and in particular to an aluminum melting furnace which utilizes flue gas waste heat to preheat waste aluminum. Background Art

[0002] Aluminum melting furnace refers to equipment widely used in the production, processing and application of aluminum and its alloys. Aluminum melting furnace is mainly used in the smelting process of aluminum alloy. Aluminum raw materials (such as aluminum ingots, aluminum slag, scrap aluminum, etc.) are heated to high temperature to melt them into aluminum liquid, and then the alloy composition is adjusted according to a specific formula to finally obtain the desired aluminum alloy.

[0003] In the prior art, large aluminum melting furnaces often have the following problems during use:

[0004] (1) During the aluminum melting process, it is often necessary to open the furnace door to dump new materials to be processed into the furnace mouth. The heat and smoke generated by opening the furnace door will be sucked into the top cover above the molten aluminum and poured into the processing system through the pipe at the top cover for direct processing, which will cause a waste of heat energy.

[0005] (2) Since large aluminum melting furnaces require a feeder to feed materials during the aluminum melting process, and a slag scraper is also required to remove slag. Therefore, during the processing, one of the machines needs to be withdrawn before the other can work. The two machines cannot run at the same time, affecting work efficiency.

[0006] The raw aluminum just put into the aluminum melting furnace cannot be melted quickly due to its hard material, which affects production efficiency. Summary of the invention

[0007] The main purpose of the present invention is to provide an aluminum melting furnace that utilizes flue gas waste heat to preheat scrap aluminum, which can effectively solve the problems of heat energy waste, inability to quickly melt raw aluminum, and inability of feeders and slag scrapers to operate simultaneously in the background technology.

[0008] To achieve the above object, the technical solution adopted by the present invention is: an aluminum melting furnace for preheating waste aluminum using flue gas waste heat, comprising:

[0009] The aluminum melting furnace body has a heat conducting pipe fixedly connected to the top of the aluminum melting furnace body.

[0010] One end is connected to the top of the aluminum melting furnace body;

[0011] A conveying mechanism, the other end of the heat conduction pipe is connected to the conveying mechanism, and the conveying mechanism is erected on one side of the extension direction of the furnace mouth of the aluminum melting furnace body;

[0012] an air valve, the air valve being installed at the connection between the heat conducting pipe and the conveying mechanism; a discharge hopper, the discharge hopper being mounted in the extending direction of the furnace opening of the aluminum melting furnace body, and the

[0013] The discharge hopper is located below the discharge port of the conveying mechanism;

[0014] A bag dust collector, the bag dust collector is located on one side of the conveying mechanism, and the dust conveying port of the bag dust collector is connected to the conveying mechanism through a pipeline;

[0015] A dust removal fan is arranged in the extension direction of the dust exhaust port of the bag dust collector, and the dust removal fan is connected with the dust exhaust port of the bag dust collector, and the exhaust port of the dust removal fan is connected with the conveying mechanism through a pipeline.

[0016] Further, the conveying mechanism includes: a chain climbing conveyor;

[0017] A conveyor sealing cover, wherein the conveyor sealing cover is disposed above the chain climbing conveyor and is fixedly connected to the chain climbing conveyor;

[0018] A sandwich plate, wherein the sandwich plate is installed inside the conveyor sealing cover, and the sandwich plate separates the conveyor sealing cover into two layers of space, an upper layer and a lower layer;

[0019] Slide rails, four of which are respectively arranged on the side walls of the feed port and the discharge port of the conveying mechanism;

[0020] Slide blocks, wherein four slide blocks are respectively slidably connected to the slide grooves of the four slide rails;

[0021] Lifting plates, two of which are installed at the front end of the feed port and the discharge port of the conveying mechanism, and the two ends of the two lifting plates are fixedly connected to the four sliding blocks respectively;

[0022] Lifting cylinders, four of which are respectively installed in the extending directions of the four slide rails, and the top ends of the four lifting cylinders are respectively fixedly connected to the four sliding blocks.

[0023] Further:

[0024] A discharge hopper bracket, wherein the discharge hopper bracket is arranged below the discharge hopper;

[0025] The support rollers are respectively mounted on the four outer edges of the bottom of the discharge hopper support.

[0026] A rotating shaft rod connecting piece, two rotating shaft rod connecting pieces are provided, and the two rotating shaft rod connecting pieces are respectively located on both sides of the symmetry axis of the discharge hopper;

[0027] A first rotating shaft rod, two of the first rotating shaft rods are respectively installed on both sides of the discharge hopper bracket, and one end of the two first rotating shaft rods is respectively rotatably connected to the two sides of the discharge hopper bracket, and the other ends of the two first rotating shaft rods are respectively rotatably connected to the two rotating shaft rod connecting members;

[0028] A second rotating shaft rod, wherein two of the second rotating shaft rods are respectively located below the two of the first rotating shaft rods, one end of the two of the second rotating shaft rods are respectively rotatably connected to the discharge hopper bracket, and the other end of the two of the second rotating shaft rods are respectively rotatably connected to the two rotating shaft rod connecting members;

[0029] Telescopic cylinders, two of which are installed below the two second rotating shafts, the tops of the two telescopic cylinders are connected to the bottoms of the rods of the two second rotating shafts, and the bottoms of the two telescopic cylinders are connected to the bottoms of the discharge hopper brackets;

[0030] A discharge hopper connecting rod is passed through the bottom of the discharge hopper, and two ends of the discharge hopper connecting rod are respectively fixedly connected to the inner surfaces of the two rotating shaft rod connecting pieces.

[0031] Further:

[0032] The connection point between the heat-conducting pipe and the conveying mechanism is located above the sandwich plate, and the connection point between the bag filter and the conveying mechanism is also located above the sandwich plate.

[0033] Further:

[0034] The connection between the dust removal fan and the conveying mechanism is located below the sandwich panel.

[0035] The lengths of the two second rotating shafts are shorter than the two first rotating shafts. Compared with the prior art, the beneficial effects of the present invention are:

[0036] (1) The present invention provides a hot gas recycling system which is composed of an aluminum melting furnace, a conveying mechanism and a bag filter. The smoke and heat generated during the melting of scrap aluminum are introduced into the conveying mechanism, and the heat is recycled.

[0037] (2) The present invention is provided with a discharge mechanism and a conveying mechanism. The bracket of the discharge mechanism is relatively high and a space is reserved in front of the bracket to ensure the normal operation of the slag scraper. The conveying mechanism is arranged on the side of the furnace body. The feeder can directly put the aluminum material into the feed port of the conveying mechanism. The operating spaces of the two devices are separated, so they can operate simultaneously, thereby improving work efficiency.

[0038] (3) The heat introduced into the conveying mechanism will preheat the aluminum material that has not yet been placed in the aluminum melting furnace. The preheated aluminum material will be easier to melt after entering the aluminum melting furnace, thereby improving the aluminum material reproduction rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the specific embodiments of the present invention, but do not constitute a limitation of the present invention.

[0040] FIG1 is a schematic diagram of the overall structure of the present invention.

[0041] FIG. 2 is an overall front view of the present invention.

[0042] Figure 3 is a cross-sectional view of the conveying mechanism of the present invention. Figure 4 is an enlarged schematic view of A in Figure 1. Figure 5 is a schematic view of the back structure of the present invention.

[0043] FIG. 6 is an overall schematic diagram of the unloading mechanism of the present invention.

[0044] Numbers in the figure: 1. Aluminum melting furnace body; 2. Heat conducting pipe; 3. Conveying mechanism; 301. Chain climbing conveyor; 302. Conveyor sealing cover; 303. Interlayer plate; 304. Slide rail; 305. Sliding block; 306. Lifting plate; 307. Lifting cylinder; 4. Air valve; 5. Discharge hopper; 6. Bag dust collector; 7. Dust removal fan; 8. Discharge hopper bracket; 9. Bracket roller; 10. Rotating shaft rod connector; 11. First rotating shaft rod; 12. Second rotating shaft rod; 13. Telescopic cylinder; 14. Discharge hopper connecting rod; DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present invention will be described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0046] Clearly and completely described, it is obvious that the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "disposed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] As shown in Fig. 1-6, an aluminum melting furnace for preheating scrap aluminum using flue gas waste heat comprises: an aluminum melting furnace body 1, a heat conducting pipe 2, a conveying mechanism 3, a discharge hopper 5, a bag filter 6, and a dust removal fan 7;

[0049] Preferably, in order to reuse the hot gas generated by molten aluminum, the top of the aluminum melting furnace body 1 is fixedly connected to

[0050] A heat pipe is connected, one end of the heat pipe 2 is connected to the top of the aluminum melting furnace body 1, and the other end of the heat pipe 2 is connected to the top of the aluminum melting furnace body 1.

[0051] The conveying mechanism 3 is connected to the conveying mechanism 3; the conveying mechanism 3 is mounted on one side of the extension direction of the furnace opening of the aluminum melting furnace body 1;

[0052] The air valve is installed at the connection between the heat pipe 2 and the conveying mechanism 3; the discharge hopper 5 is installed on the aluminum melting furnace

[0053] The body 1 is in the extending direction of the furnace mouth, and the discharge hopper 5 is located below the discharge port of the conveying mechanism 3; the bag filter

[0054] The dust collector 6 is located on one side of the conveying mechanism 3, and the dust delivery port of the bag dust collector 6 is connected to the conveying mechanism 3 through a pipe.

[0055] dust removal fan 7 is arranged in the direction of extension of the dust outlet of the bag dust collector 6, and the dust removal fan 7

[0056] The dust outlet of the dust collector 6 is connected to the dust outlet of the dust removal fan 7 and the conveying mechanism 3 is connected through a pipeline.

[0057] When hot gas is generated at the furnace mouth, the hot gas will rise to the top cover of the aluminum melting furnace body 1 and follow the

[0058] The heat conducting pipe 22 on the cover is introduced into the conveying mechanism 3, so that the conveying process of the aluminum material in the conveying mechanism 3 is a preheating process.

[0059] It is understandable that in order to prevent the internal temperature of the conveying mechanism 3 from being too high and causing the pressure to increase, the air

[0060] The air valve 4 is at the connection between the conveying mechanism 3 and the heat conducting pipe 2. The air valve 4 can automatically exhaust when the pressure is too high.

[0061] In this embodiment, as shown in FIG3 , in order to allow the conveying mechanism 3 to store as much heat as possible, the aluminum melt

[0062] The conveying mechanism 3 arranged on the side of the furnace opening of the furnace body 1 is composed of a chain climbing conveyor 301 , a conveyor sealing cover 302 , a sandwich plate 303 , a slide rail 304 , a slider 305 , a lifting plate 306 and a lifting cylinder 307 .

[0063] It is understandable that the lifting door of the aluminum melting furnace is usually controlled by a PLC automatic temperature control system. When the control system issues a command, the door of the aluminum melting furnace rises. Similarly, the four lifting cylinders 307 are also controlled by the PLC automatic temperature control system.

[0064] In this embodiment, a conveyor sealing cover 302 is fixedly connected above the chain climbing conveyor 301, and a sandwich plate 303 is installed inside the conveyor sealing cover 302. The sandwich plate 303 seals the conveyor.

[0065] The cover 302 is divided into two spaces, the upper space is sealed, and the lower space is provided with an outlet.

[0066] The four slide rails 304 are respectively arranged on both sides of the feed inlet and the discharge outlet of the conveying mechanism 3.

[0067] four sliders 305 are respectively connected to the slide grooves of the four slide rails 304; two lifting plates

[0068] 306 are respectively installed at the front end of the feeding port and the discharging port of the conveying mechanism 3, and the two ends of the two lifting plates 306 are respectively

[0069] The four lifting cylinders 307 are respectively installed on the extension of the four slide rails 304.

[0070] The top ends of the four lifting cylinders 307 are fixedly connected to the four sliders 305.

[0071] For example, liftable door panels are designed at the feed port and the discharge port to control the sealing and opening of the conveying mechanism 3. When the four lifting cylinders 307 receive the control command, the cylinders rise and push the slider 305, and the slider 305 pushes the lifting plate 306 upward to open the discharge port.

[0072] In this embodiment, the hot air generated by the aluminum melting furnace is about 500-800 degrees, which is much higher than the temperature inside the conveying mechanism 3. In addition, the top cover of the aluminum melting furnace body 1 is higher than the conveying mechanism 3. The temperature difference and height difference cause the occurrence of thermal convection effect. The hot air will be directly introduced into the upper layer of the conveying mechanism 3 (the space above the sandwich plate 303) along the pipeline without any auxiliary facilities. After the hot air is introduced into the conveying mechanism 3, it will quickly

[0073] Raising the temperature of the upper layer inside the conveying mechanism 3 will also increase the temperature of the lower layer (sandwich plate 303

[0074] The air in the space below is heated (heat conduction effect). When the temperature rises to the same level as the aluminum melting furnace body 1,

[0075] When the hot air is close to the dust collector, the dust collector is turned on because the conveying mechanism 3 is also connected to the bag dust collector 6.

[0076] The fan 7 will draw part of the hot air into the bag filter 6 for dust removal.

[0077] The upper layer of the conveying mechanism 3 from which part of the hot air has been sucked away will drop in temperature to a certain extent, ensuring that the thermal convection effect continues to occur, while the hot air from which the smoke has been filtered out still has some residual heat, which will be introduced into the lower layer of the conveying mechanism 3 by the exhaust pipe of the dust removal fan 7.

[0078] It is worth mentioning that the chain climbing conveyor 301 is a type of chain plate conveyor.

[0079] The machine can withstand a high temperature of about 1000 degrees and can fully withstand the temperature of hot air.

[0080] Preferably, as shown in FIG6 , in order to allow the scraper to operate normally and to be able to access the conveying mechanism 3

[0081] Aluminum material poured out from the discharge port. The discharge hopper 5 is set up below the conveying mechanism 3; the discharge hopper bracket 8 is set up

[0082] Below the discharge hopper 5, two rotating shaft rod connecting members 10 are provided, which are respectively located on both sides of the symmetry axis of the discharge hopper 5;

[0083] The two first rotating shaft rods 11 are respectively installed on both sides of the discharge hopper bracket 8, and the two first rotating shaft rods 11 are

[0084] One end is rotatably connected to both sides of the discharge hopper bracket 8, and the other ends of the two first rotating shaft rods 11 are respectively

[0085] The two second rotating shaft rods 12 are respectively located at the two first rotating shaft rods 10.

[0086] Below the shaft 11, one end of two second rotating shafts 12 are respectively rotatably connected to the discharge hopper bracket 8.

[0087] The other ends of the two second rotating shaft rods 12 are respectively rotatably connected to the two rotating shaft rod connecting members 10;

[0088] The retracting cylinders 13 are each installed below the two second rotating shafts, and the tops of the two telescopic cylinders 13 are respectively connected to the two first rotating shafts.

[0089] The bottom of the rod body of the two rotating shaft rods 12 is connected, and the bottoms of the two telescopic cylinders 13 are respectively connected to the unloading hopper bracket 8

[0090] The bottom connection; the discharge hopper connecting rod 14 is arranged at the bottom of the discharge hopper, and the two ends of the discharge hopper connecting rod 14 are

[0091] The inner surfaces of the two rotating shaft rod connectors 10 are fixedly connected. Such a design is to make the height of the discharge hopper 5 adjustable, leaving enough space below to ensure the normal operation of the scraper.

[0092] In this embodiment, when the discharge hopper 5 is low and blocks the normal operating space of the scraper, the control system

[0093] The system sends a command to lift the two telescopic cylinders 13, and the two telescopic cylinders 13 lift the two second rotating shafts.

[0094] The rod 12 pushes, and the two second shaft rods 12 push and drive the two first shaft rods 11 to connect with the two shaft rods.

[0095] The connecting piece 10 is lifted, and the two rotating shaft rod connecting pieces 10 are lifted, which causes the discharge hopper connecting rod 14 to be lifted, and then,

[0096] Finally, the discharge hopper 5 is lifted, so that the operating space of the scraper can be controlled and adjusted. It can be understood that since the length of the two second rotating shaft rods 12 is less than the two first rotating shaft rods 11, and

[0097] Both are connected to a shaft rod connector 10. Because of the height difference between the first and second shafts, when the telescopic cylinder 13 lifts the second shaft rod 12, the second shaft rod 12 will first drive the shaft to rotate.

[0098] After the shaft rod connecting member 10 is connected, the rotating shaft rod connecting member 10 drives the first rotating shaft rod 11.

[0099] This will cause angular misalignment, which will lead to the tilting of the shaft rod connector 10, and eventually lead to unloading.

[0100] The tilt of the hopper 5, and thus the lifting and lowering of the telescopic cylinder 13, can also control the tilt angle of the discharge hopper 5. In actual work, it can be adjusted according to actual conditions.

[0101] It should be noted that the present invention is an aluminum melting furnace that uses flue gas waste heat to preheat scrap aluminum. When in use, the PLC automatic temperature control system sends instructions to the aluminum melting furnace body 1 and the conveying mechanism 3. The furnace door is opened, and the two lifting cylinders 307 of the feed inlet are lifted first. The cylinders are lifted and push the two sliders 305 connected to them. The sliders 305 will push the lifting plate 306 of the feed inlet upward to open the feed inlet. Put the aluminum material into the chain climbing conveyor

[0102] After the conveyor 301 is started, the conveyor is started, and after the aluminum material enters the feed port, the feed port lifting plate 306 is closed, and the conveyor

[0103] When the conveyor conveys the aluminum material to the discharge port, the discharge port lifting plate opens and the aluminum material pours into the discharge hopper below.

[0104] After that, the discharge port lifting plate is closed, and the angle of the discharge hopper 5 itself is tilted toward the furnace port. The aluminum material will slide down into the aluminum melting furnace body 1 due to gravity. The aluminum melting furnace starts to melt the aluminum material, and the combustion generates hot gas that rises. The hot gas will be introduced into the upper layer of the sandwich plate 303 of the conveying mechanism 3 along the heat conduction pipe 2. The upper layer of the sandwich plate 303 has a temperature of 1000 m / s.

[0105] The air temperature rises rapidly, heating the air temperature in the space below the sandwich plate 303. When the temperature rises to a level close to the hot air just introduced, the dust removal fan 7 is turned on. The fan draws the hot air from the upper layer of the sandwich plate 303 into the bag filter 6 to filter the smoke. The residual heat after filtration is introduced into the space below the sandwich plate 303 by the fan.

[0106] To ensure full utilization of waste heat, the aluminum material put into the conveying mechanism 3 will be

[0107] The preheated aluminum material will be melted faster after entering the aluminum melting furnace body 1. Repeating the above operation can realize the reuse of flue gas waste heat.

[0108] It is worth mentioning that the invention mentioned in the description process: "aluminum melting furnace body, PLC automatic temperature control system, chain climbing conveyor, dust removal fan, air valve, etc." are all existing technologies with mature technical processes, so the technical principles are not described in detail here.

[0109] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An aluminum melting furnace that uses flue gas waste heat to preheat scrap aluminum, characterized in that: include: An aluminum melting furnace body (1), wherein a heat conducting pipe (2) is fixedly connected to the top of the aluminum melting furnace body (1), and one end of the heat conducting pipe (2) is in communication with the top of the aluminum melting furnace body (1); A conveying mechanism (3), wherein the other end of the heat conducting pipe (2) is in communication with the conveying mechanism (3), and the conveying mechanism (3) is mounted on one side of the extending direction of the furnace opening of the aluminum melting furnace body (1); An air valve (4), the air valve (4) being installed at the connection between the heat conducting pipe (2) and the conveying mechanism (3); A discharge hopper (5), the discharge hopper (5) being mounted in the extension direction of the furnace opening of the aluminum melting furnace body (1), and the discharge hopper (5) being located below the discharge opening of the conveying mechanism (3); A bag dust collector (6), the bag dust collector (6) being located on one side of the conveying mechanism (3), and the dust conveying port of the bag dust collector (6) being connected to the conveying mechanism (3) through a pipeline; a dust removal fan (7), the dust removal fan (7) being arranged in the extension direction of the dust discharge port of the bag dust collector (6), the dust removal fan (7) being connected to the dust discharge port of the bag dust collector (6), and the exhaust port of the dust removal fan (7) being connected to the conveying mechanism (3) via a pipeline; The conveying mechanism (3) comprises: Chain climbing conveyor (301); A conveyor sealing cover (302), wherein the conveyor sealing cover (302) is arranged above the chain-type climbing conveyor (301), and the conveyor sealing cover (302) is fixedly connected to the chain-type climbing conveyor (301); A sandwich plate (303), the sandwich plate (303) being installed inside the conveyor sealing cover (302), and the sandwich plate (303) dividing the conveyor sealing cover (302) into two layers of space, an upper layer and a lower layer; Slide rails (304), four of the slide rails (304) are respectively arranged on the side walls of the feed port and the discharge port of the conveying mechanism (3); Slide blocks (305), four of the slide blocks (305) are slidably connected to the slide grooves of the four slide rails (304) respectively; Lifting plates (306), two of the lifting plates (306) are respectively installed at the front end of the feed port and the discharge port of the conveying mechanism (3), and both ends of the two lifting plates (306) are respectively fixedly connected to the four sliding blocks (305); Lifting cylinders (307), four of the lifting cylinders (307) are respectively installed in the extension direction of the four slide rails (304), and the top ends of the four lifting cylinders (307) are respectively fixedly connected to the four slide blocks (305); A discharge hopper bracket (8), wherein the discharge hopper bracket (8) is mounted below the discharge hopper (5); The support rollers (9) are respectively mounted on the bottom of the discharge hopper support (8) The four outer edges of the body.

2. The aluminum melting furnace for preheating scrap aluminum using flue gas waste heat according to claim 1, characterized in that: Also includes: A rotating shaft rod connecting member (10), wherein two rotating shaft rod connecting members (10) are provided, and the two rotating shaft rod connecting members (10) are respectively located on both sides of the symmetry axis of the discharge hopper (5); A first rotating shaft rod (11), wherein two of the first rotating shaft rods (11) are respectively mounted on two sides of the discharge hopper bracket (8), and one end of the two first rotating shaft rods (11) is respectively rotatably connected to the two sides of the discharge hopper bracket (8), and the other end of the two first rotating shaft rods (11) is respectively rotatably connected to the two rotating shaft rod connecting members (10); A second rotating shaft rod (12), wherein the two second rotating shaft rods (12) are respectively located below the two first rotating shaft rods (11), one end of the two second rotating shaft rods (12) are respectively rotatably connected to the discharge hopper bracket (8), and the other end of the two second rotating shaft rods (12) are respectively rotatably connected to the two rotating shaft rod connecting members (10); Telescopic cylinders (13), two of the telescopic cylinders (13) are respectively installed below the two second rotating shafts, the top ends of the two telescopic cylinders (13) are respectively connected to the bottom ends of the rods of the two second rotating shaft rods (12), and the bottom ends of the two telescopic cylinders (13) are respectively connected to the bottom ends of the discharge hopper brackets (8); A discharge hopper connecting rod (14), wherein the discharge hopper connecting rod (14) is passed through the bottom of the discharge hopper (5), and the two ends of the discharge hopper connecting rod (14) are respectively fixedly connected to the inner surfaces of the two rotating shaft rod connecting members (10).

3. The aluminum melting furnace for preheating scrap aluminum using flue gas waste heat according to claim 1, characterized in that: The connection point between the heat conducting pipe (2) and the conveying mechanism (3) is located above the sandwich plate (303), and the connection point between the bag filter (6) and the conveying mechanism (3) is also located above the sandwich plate (303).

4. The aluminum melting furnace for preheating scrap aluminum using flue gas waste heat according to claim 1, characterized in that: The connection point between the dust removal fan (7) and the conveying mechanism (3) is located below the sandwich plate (303).

5. The aluminum melting furnace for preheating scrap aluminum using flue gas waste heat according to claim 2, characterized in that: The two second rotating shaft rods (12) are shorter than the two first rotating shaft rods (11).

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