An automated paint stripping system and its control method based on recycled aluminum from aluminum cans

Abstract

This invention discloses an automated paint stripping system and its control method based on recycled aluminum cans. The system includes a double-layer thermal radiation paint stripping roller mounted on a system frame. The roller is driven to rotate by a motor. A dual-compartment feeding channel is located at the feeding end of the roller, and a dual-compartment unloading channel is located at the unloading end. A waste gas combustion chamber and the roller are connected via a heat energy recovery and circulation mechanism. A cyclone separator is mounted on the roller and connected to the heat energy recovery and circulation mechanism. This invention uses heat energy recovery to strip paint from waste aluminum cans, employing thermal radiation and backflushing convection to improve stripping efficiency and quality. Furthermore, the waste gas combustion and circulation system recovers heat energy, significantly reducing the overall energy consumption of the paint stripping system.

Description

Technical Field

[0001] This invention belongs to the field of aluminum can paint removal technology, specifically relating to an automated paint removal system and its control method based on recycled aluminum from aluminum cans. Background Technology

[0002] With increasing environmental awareness, the recycling and reuse of waste aluminum cans has become a focus of social attention. During the recycling process, the paint layer on the surface of waste aluminum cans not only affects subsequent processing but may also pollute the environment. Therefore, aluminum can paint removal equipment plays a crucial role in the waste aluminum can recycling industry chain. Through paint removal, the paint layer on the surface of waste aluminum cans is peeled off, facilitating subsequent processing and reuse. Paint removal reduces the environmental pollution caused by waste aluminum cans and meets environmental protection requirements.

[0003] Existing aluminum can paint stripping systems pyrolyze the paint layer on the surface of waste aluminum cans through heating. However, the heat energy recovery and utilization effect after pyrolysis of waste aluminum cans is not good in the entire aluminum can paint stripping system, and the heat energy recovery and utilization rate is low. This leads to large energy loss in the aluminum can paint stripping system, and it cannot effectively treat the harmful gases generated by the aluminum can paint stripping system, thus failing to meet the environmental protection requirements for exhaust gas emissions. Therefore, we propose an automated paint stripping system based on recycled aluminum cans and its control method. Summary of the Invention

[0004] The purpose of this invention is to provide an automated paint stripping system and its control method based on recycled aluminum from aluminum cans, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an automated paint stripping system based on recycled aluminum from aluminum cans, comprising,

[0006] A double-layer thermal radiation paint stripping roller is installed on the system frame. The double-layer thermal radiation paint stripping roller is driven to rotate by a motor and continuously thermally decomposes the oil and gas layer on the surface of waste aluminum cans by thermal radiation.

[0007] A dual-compartment feeding channel is provided at the feeding end of the double-layer thermal radiation paint stripping roller. The dual-compartment feeding channel is used to achieve sealed feeding of waste aluminum cans.

[0008] A dual-compartment feeding channel is provided at the feeding end of the double-layer thermal radiation paint stripping roller. The dual-compartment feeding channel is used to achieve sealed feeding of waste aluminum cans after paint stripping.

[0009] The exhaust gas combustion chamber is connected to the double-layer thermal radiation paint stripping roller via a heat energy recovery and circulation mechanism. The heat energy recovery and circulation mechanism is used to circulate the exhaust gas generated in the double-layer thermal radiation paint stripping roller to the exhaust gas combustion chamber. The exhaust gas combustion chamber is used to combust the exhaust gas and recover the heat energy generated in the exhaust gas combustion chamber to the double-layer thermal radiation paint stripping roller through the heat energy recovery and circulation mechanism.

[0010] A cyclone separator is installed on the double-layer thermal radiation paint stripping drum and connected to the heat energy recovery and circulation mechanism. The cyclone separator is used to separate and clean dust particles in the exhaust gas generated inside the double-layer thermal radiation paint stripping drum.

[0011] Preferably, the double-layer thermal radiation paint stripping roller is under a slight negative pressure, and the negative pressure inside the double-layer thermal radiation paint stripping roller is -5mbar.

[0012] Preferably, the double-layer thermal radiation paint stripping roller includes an outer cylinder and an inner cylinder;

[0013] The outer cylinder is rotatably mounted on the system frame via rollers. The loading and unloading ends of the outer cylinder and the double-layer thermal radiation paint stripping roller are rotatably connected. The inner cylinder is located at the center of the outer cylinder, and one end of the inner cylinder extends out of the loading end of the double-layer thermal radiation paint stripping roller and is connected to the heat energy recovery and circulation mechanism.

[0014] An arc-shaped back-blowing seat is provided inside the outer cylinder corresponding to the material feeding end of the double-layer thermal radiation paint stripping roller. The other end of the inner cylinder is aligned with the arc-shaped back-blowing seat, and the inner cylinder and the arc-shaped back-blowing seat do not contact each other.

[0015] The inner wall of the outer cylinder is provided with equally spaced spiral conveyor plates.

[0016] Preferably, the dual-compartment feeding channel includes a feeding shell, a feeding hopper, a first telescopic cylinder, a first rotary sealing plate, a second telescopic cylinder, and a second rotary sealing plate;

[0017] The feeding housing is located at the feeding end of the double-layer thermal radiation paint stripping roller, and the feeding hopper is located at the bottom of the feeding housing. The first rotating sealing plate and the second rotating sealing plate are rotatably located inside the upper and lower parts of the feeding housing through rotating shafts and bearings, respectively. The first telescopic cylinder and the second telescopic cylinder are located on the outside of the feeding housing at positions corresponding to the first rotating sealing plate and the second rotating sealing plate, respectively. The output ends of the first telescopic cylinder and the second telescopic cylinder are connected to the rotating shafts on the first rotating sealing plate and the second rotating sealing plate through connecting rods.

[0018] The feeding housing is provided with inclined first abutment plates at positions corresponding to the first and second rotating sealing plates, forming a dual-compartment feeding structure between the first rotating sealing plate, the second rotating sealing plate, and the first abutment plates.

[0019] Preferably, the dual-compartment unloading channel includes an unloading shell, an unloading hopper, a third telescopic cylinder, a third rotary sealing plate, a fourth telescopic cylinder, a fourth rotary sealing plate, a fifth telescopic cylinder, and a fifth rotary sealing plate;

[0020] The feeding housing is located at the feeding end of the double-layer thermal radiation paint stripping roller. Two feeding hoppers are provided, symmetrically arranged at the bottom of the feeding housing. The third and fourth rotating sealing plates are rotatably mounted inside the feeding housing via rotating shafts and bearings at their respective upper and lower parts. The third and fourth telescopic cylinders are respectively located on the outside of the feeding housing at positions corresponding to the third and fourth rotating sealing plates. The output ends of the third and fourth telescopic cylinders are connected to the rotating shafts on the third and fourth rotating sealing plates via connecting rods. A second abutment plate is provided inside the feeding housing at positions corresponding to the third and fourth rotating sealing plates. The third rotating sealing plate, the fourth rotating sealing plate, and the second abutment plates form a double-compartment feeding structure.

[0021] The fifth rotating sealing plate is installed inside the hopper via a rotating shaft and bearings. The fifth telescopic cylinder is located on the outside of the hopper at a position corresponding to the fifth rotating sealing plate. The output end of the fifth telescopic cylinder is connected to the rotating shaft on the fifth rotating sealing plate via a connecting rod.

[0022] Preferably, the exhaust gas combustion chamber includes an exhaust gas combustion shell, a combustion gas chamber ring, an ignition nozzle, and a guide plate;

[0023] The exhaust gas combustion shell is connected to the heat energy recovery and circulation mechanism. Several combustion gas chamber rings are provided. Several combustion gas chamber rings are equally spaced inside the exhaust gas combustion shell. Several combustion gas chamber rings are connected to a combustion gas delivery system. Several ignition nozzles are connected to the inner side of each combustion gas chamber ring.

[0024] The guide plates are provided in a plurality of them, and the plurality of guide plates are alternately distributed on the inner side of the exhaust gas combustion shell.

[0025] Preferably, the heat energy recovery and circulation mechanism includes a circulating fan, an exhaust gas conveying pipe, and a heat energy recovery conveying pipe;

[0026] The input end of the circulating fan is connected to the cyclone separator through the exhaust gas conveying pipe, the output end of the circulating fan is connected to the input end of the exhaust gas combustion shell through the exhaust gas conveying pipe, and the output end of the exhaust gas combustion shell is connected to the inner cylinder through the heat energy recovery conveying pipe.

[0027] Preferably, the cyclone separator includes a cyclone separator shell, an ash hopper, an exhaust gas inlet port, a fixed support, and a rotating separation column;

[0028] The cyclone separator housing is located at the feeding end of the double-layer thermal radiation paint stripping roller through the exhaust gas inlet port. The ash hopper is located at the bottom of the cyclone separator housing. The rotating separation column is rotatably installed inside the cyclone separator housing at the position corresponding to the exhaust gas inlet port through the fixed bracket. The outer side of the rotating separation column is provided with a ring-shaped distribution of separation slots.

[0029] Preferably, an arc-shaped guide plate is provided inside the cyclone separator housing at the position corresponding to the rotating separator column, and a sloping lower ash ring is provided in the lower part of the interior of the cyclone separator housing.

[0030] A control method for an automated paint stripping system based on recycled aluminum cans includes the following steps:

[0031] A. Loading waste aluminum cans:

[0032] Waste aluminum cans are fed into the feeding housing. At this time, the first and second rotating sealing plates are sealed to the first abutment plate. When the waste aluminum cans have been fed into the feeding housing in a specified amount, the first telescopic cylinder extends and drives the rotating shaft to rotate through the connecting rod, thereby causing the first rotating sealing plate to rotate and open, allowing the waste aluminum cans to fall between the first and second rotating sealing plates. Then, the first rotating sealing plate retracts and drives it to rotate and close. Then, the second telescopic cylinder extends and drives the rotating shaft to rotate through the connecting rod, causing the second rotating sealing plate to rotate and open, allowing the waste aluminum cans to fall through the feeding hopper to the feeding end of the double-layer thermal radiation paint stripping roller.

[0033] B: Paint stripping treatment of waste aluminum cans:

[0034] Next, the outer cylinder is driven to rotate by a motor and gradually conveys the waste aluminum cans to the lower end through a spiral conveyor plate. During this process, the inner cylinder recovers and utilizes the heat energy generated in the exhaust combustion chamber through a heat energy recovery and circulation mechanism. The heat energy is first conveyed from the upper end to the lower end through the inner cylinder, and then the heat energy is back-blown between the outer and inner cylinders through an arc-shaped back-blowing seat. The heat energy then moves from the lower end to the upper end. Through the thermal radiation of the inner cylinder, the oil and gas layer on the surface of the waste aluminum can is thermally decomposed.

[0035] C: Waste gas dust separation:

[0036] During the pyrolysis of waste aluminum cans, waste gas is generated. The waste gas is located between the outer and inner cylinders. At this time, the circulating fan draws the waste gas into the cyclone separator through the waste gas delivery pipe. The waste gas is blown onto the arc-shaped guide plate through the waste gas inlet port, so that the waste gas is guided to the rotating separation column. As the rotating separation column rotates on the fixed support, the dust in the waste gas is separated and discharged through the ash hopper.

[0037] D. Waste gas combustion treatment:

[0038] Next, the circulating fan draws the dust-laden exhaust gas from the cyclone separator into the exhaust gas combustion chamber through the exhaust gas conveying pipe. Then, the combustion gas is conveyed into the combustion gas chamber ring through the combustion gas conveying system and ignited through the ignition nozzle. At this time, the exhaust gas moves through the guide plate in the exhaust gas combustion shell and is burned by the flame generated by the ignition nozzle, so that the exhaust gas is effectively burned and meets the emission standards.

[0039] E. Heat energy recovery and utilization:

[0040] The heat energy generated by the combustion of waste gas inside the waste gas combustion shell is transported to the inner cylinder through the heat energy recovery and conveying pipe, so that the heat energy generated by the combustion of waste gas can be recycled.

[0041] F. Disposal of paint-stripped waste aluminum cans:

[0042] After the paint has been removed from the outer cylinder and inner cylinder, the waste aluminum cans are conveyed by a screw conveyor and fall onto the third rotating sealing plate inside the unloading housing. Then, the third telescopic cylinder extends, driving the rotating shaft to rotate via a connecting rod, which in turn causes the third rotating sealing plate to rotate and open. The paint-removed waste aluminum cans fall between the third and fourth rotating sealing plates. Next, the third telescopic cylinder retracts, closing the third rotating sealing plate. Then, the fourth telescopic cylinder extends, driving the rotating shaft to rotate via a connecting rod, opening the fourth rotating sealing plate. The paint-removed waste aluminum cans fall onto the fifth rotating sealing plate inside the two unloading hoppers. Then, the fourth telescopic cylinder retracts, closing the fourth rotating sealing plate. Next, the fifth telescopic cylinder extends, driving the rotating shaft to rotate via a connecting rod, opening the fifth rotating sealing plate. The paint-removed waste aluminum cans are discharged from the unloading hoppers. Finally, the fifth telescopic cylinder retracts, closing the fifth rotating sealing plate, completing the unloading operation of the paint-removed waste aluminum cans.

[0043] Compared with the prior art, the beneficial effects of the present invention are:

[0044] 1. This invention features a double-layer thermal radiation paint stripping drum. The outer and inner cylinders rotate relative to each other, allowing waste aluminum cans to be spirally conveyed between them. The inner cylinder radiates heat, continuously thermally decomposing the cans. An arc-shaped back-blowing seat then back-blown the heat, filling the entire interior of the double-layer thermal radiation paint stripping drum. This effectively removes and dries the paint from the cans, leaving them smooth and free of paint. This significantly improves the metal recovery rate and reduces metal loss. In this paint stripping system, the double-layer thermal radiation paint stripping drum utilizes heat recovery, eliminating open flames and employing low-temperature stripping to minimize metal loss. The process generates no water mist, and the heat radiation from the inner cylinder and the back-blowing heat convection from the arc-shaped back-blowing seat greatly enhance the efficiency and quality of the paint stripping process.

[0045] 2. The present invention is equipped with a double-compartment feeding channel and a double-compartment unloading channel. When loading and unloading waste aluminum cans, a multi-compartment separate opening and closing structure is adopted to achieve sealing of waste aluminum can loading and unloading, reduce heat leakage during loading and unloading, greatly reduce heat loss of the paint stripping system, and improve the heat utilization rate of the paint stripping system.

[0046] 3. This invention is equipped with a waste gas combustion chamber, which uses gas combustion treatment to completely incinerate the waste gas from pyrolysis and gasification. The surface coating of waste aluminum cans often contains organic or inorganic compounds, and often both. Through thermal degradation and / or oxidation, these complex compounds are reduced to their most basic forms, such as polypropylene being degraded into carbon monoxide, carbon dioxide, hydrogen, and water vapor. All products emitted from the paint stripping process, except for water vapor, are harmful to the environment. Therefore, they must be incinerated before being released into the atmosphere. By using a high-temperature flame and sufficient residence time, the regeneration of harmful organic compounds is avoided, which can effectively treat the waste gas, meet emission standards, and reduce the emission of harmful gases into the environment.

[0047] 4. The present invention is equipped with a heat energy recovery and circulation mechanism, which realizes the circulation combustion of waste gas and the recovery and utilization of heat energy through a circulating fan, a waste gas conveying pipe and a heat energy recovery conveying pipe. The energy released during the combustion and pyrolysis of the gas is reused, so the total energy consumption of the paint stripping system is very low, greatly reducing the energy consumption of the paint stripping system, while improving the heat energy recovery and utilization rate of the paint stripping system.

[0048] 5. The present invention is equipped with a cyclone separator, which separates and removes fine particles such as fine powder and dust from the exhaust gas, preventing the exhaust gas from being recycled back into the double-layer thermal radiation paint stripping drum after combustion and pyrolysis, ensuring that no dust and dirt are brought into the double-layer thermal radiation paint stripping drum, and ensuring the normal operation of the paint stripping system. Attached Figure Description

[0049] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0050] Figure 2 This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0051] Figure 3 This is a three-dimensional structural diagram of the dual-compartment feeding channel of the present invention;

[0052] Figure 4 This is a three-dimensional structural diagram of the dual-compartment feeding channel of the present invention;

[0053] Figure 5 This is a partial cross-sectional perspective view of the three-dimensional structure of the dual-compartment feeding channel of the present invention;

[0054] Figure 6 This is a three-dimensional structural diagram of the dual-compartment feeding channel of the present invention;

[0055] Figure 7 This is a three-dimensional structural diagram of the dual-compartment feeding channel of the present invention;

[0056] Figure 8 This is a cross-sectional perspective view of the three-dimensional structure of the dual-compartment feeding channel of the present invention;

[0057] Figure 9 This is a three-dimensional structural diagram of the double-layer thermal radiation paint stripping roller of the present invention;

[0058] Figure 10 This is a partial cross-sectional view of the double-layer thermal radiation paint stripping roller of the present invention;

[0059] Figure 11 This is a three-dimensional structural diagram of the exhaust gas combustion chamber of the present invention;

[0060] Figure 12 This is a cross-sectional view of the exhaust gas combustion chamber of the present invention;

[0061] Figure 13 This is a three-dimensional structural diagram of the cyclone separator of the present invention;

[0062] Figure 14 This is a cross-sectional view of the cyclone separator of the present invention;

[0063] Figure 15 This is a cross-sectional perspective view of the cyclone separator of the present invention.

[0064] In the diagram: 1. Double-layer thermal radiation paint stripping roller; 101. Outer cylinder; 102. Inner cylinder; 103. Arc-shaped back-blowing seat; 104. Spiral conveyor plate; 2. Double-bin feeding channel; 201. Feeding shell; 202. Feeding hopper; 203. First telescopic cylinder; 204. First rotating sealing plate; 205. Second telescopic cylinder; 206. Second rotating sealing plate; 207. First abutment plate; 3. Double-bin unloading channel; 301. Unloading shell; 302. Unloading hopper; 303. Third telescopic cylinder; 304. Third rotating sealing plate; 305. Fourth telescopic cylinder; 306. Fourth rotating sealing plate; 30 7. Fifth telescopic cylinder; 308. Fifth rotating sealing plate; 309. Second abutment plate; 4. Exhaust gas combustion chamber; 401. Exhaust gas combustion shell; 402. Combustion gas chamber ring; 403. Ignition nozzle; 404. Guide plate; 5. Heat energy recovery and circulation mechanism; 501. Circulating fan; 502. Exhaust gas conveying pipe; 503. Heat energy recovery conveying pipe; 6. Cyclone separator; 601. Cyclone separator shell; 602. Ash hopper; 603. Exhaust gas inlet port; 604. Fixed bracket; 605. Rotating separation column; 606. Separation slot; 607. Arc-shaped guide plate; 608. Ash ring under the slope. Detailed Implementation

[0065] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0066] Please see Figures 1-15 The present invention provides an automated paint stripping system based on recycled aluminum from aluminum cans, comprising:

[0067] A double-layer thermal radiation paint stripping roller 1 is mounted on the system frame. Driven by a motor, the roller continuously thermally decomposes the oil and gas layer on the surface of waste aluminum cans through thermal radiation. The roller 1 operates under a slight negative pressure of -5 mbar, generating suction to reduce heat leakage. The roller 1 comprises an outer cylinder 101 and an inner cylinder 102. The outer cylinder 101 is mounted on the system frame via rollers. The loading and unloading ends of the paint stripping roller 1 are rotatably connected. The inner cylinder 102 is located at the center inside the outer cylinder 101, and one end of the inner cylinder 102 extends out to the loading end of the double-layer thermal radiation paint stripping roller 1 and is connected to the heat energy recovery and circulation mechanism 5. An arc-shaped back-blowing seat 103 is provided inside the outer cylinder 101 corresponding to the unloading end of the double-layer thermal radiation paint stripping roller 1. The other end of the inner cylinder 102 is aligned with the arc-shaped back-blowing seat 103, and the inner cylinder 102 and the arc-shaped back-blowing seat 103 do not contact each other. Spiral conveying plates 104 are provided on the inner side wall of the outer cylinder 101 at equal intervals.

[0068] This invention features a double-layer thermal radiation paint stripping roller 1. The outer cylinder 101 and inner cylinder 102 rotate relative to each other, causing waste aluminum cans to be spirally conveyed between them. Heat radiation occurs through the inner cylinder 102. The temperature inside the double-layer thermal radiation paint stripping roller 1 is 350-530℃, resulting in continuous thermal decomposition of the waste aluminum cans. The heat is then backflushed through an arc-shaped backflushing seat 103, filling the entire interior of the double-layer thermal radiation paint stripping roller 1 with heat energy, achieving effective paint stripping and drying of the waste aluminum cans. The surface of the devarnished waste aluminum cans... With no paint and a smooth finish, the metal recovery rate of existing aluminum can paint removal systems is 85-90%, while the metal recovery rate of this paint removal system reaches over 98%, greatly improving the metal recovery rate of waste aluminum cans and reducing metal loss. In this paint removal system, the double-layer thermal radiation paint removal roller 1 adopts a heat energy recovery and utilization method, and there is no open flame inside. Low-temperature paint removal is used to reduce metal loss. No water mist is generated during the process, and the paint removal efficiency and quality are greatly improved through the thermal radiation of the inner cylinder 102 and the back-blowing heat convection of the arc-shaped back-blowing seat 103.

[0069] A dual-compartment feeding channel 2 is located at the feeding end of the double-layer thermal radiation paint stripping roller 1. The dual-compartment feeding channel 2 is used to achieve sealed feeding of waste aluminum cans. The dual-compartment feeding channel 2 includes a feeding housing 201, a feeding hopper 202, a first telescopic cylinder 203, a first rotary sealing plate 204, a second telescopic cylinder 205, and a second rotary sealing plate 206. The feeding housing 201 is located at the feeding end of the double-layer thermal radiation paint stripping roller 1, and the feeding hopper 202 is located at the bottom of the feeding housing 201. The first rotary sealing plate 204 and the second rotary sealing plate 206 are rotatably mounted inside the feeding housing 201 via rotating shafts and bearings, respectively. In the feeding housing 201, the first telescopic cylinder 203 and the second telescopic cylinder 205 are respectively disposed on the outer side of the feeding housing 201 at positions corresponding to the first rotating sealing plate 204 and the second rotating sealing plate 206, and the output ends of the first telescopic cylinder 203 and the second telescopic cylinder 205 are respectively connected to the rotating shafts on the first rotating sealing plate 204 and the second rotating sealing plate 206 through connecting rods; inside the feeding housing 201, at positions corresponding to the first rotating sealing plate 204 and the second rotating sealing plate 206, there are inclined first abutment plates 207, and the first rotating sealing plate 204, the second rotating sealing plate 206 and the first abutment plates 207 form a feeding double-compartment structure;

[0070] A dual-compartment feeding channel 3 is located at the feeding end of the double-layer thermal radiation paint stripping roller 1. The dual-compartment feeding channel 3 is used to achieve sealed feeding of waste aluminum cans after paint stripping. The dual-compartment feeding channel 3 includes a feeding housing 301, a feeding hopper 302, a third telescopic cylinder 303, a third rotary sealing plate 304, a fourth telescopic cylinder 305, a fourth rotary sealing plate 306, a fifth telescopic cylinder 307, and a fifth rotary sealing plate 308. The feeding housing 301 is located at the feeding end of the double-layer thermal radiation paint stripping roller 1. Two feeding hoppers 302 are provided, symmetrically arranged at the bottom of the feeding housing 301. The third rotary sealing plate 304 and the fourth rotary sealing plate 306 are rotatably arranged inside the feeding housing 301 via rotating shafts and bearings, respectively. The third telescopic cylinder 303 and the fourth telescopic cylinder 305 are respectively located at the lower... The outer side of the material housing 301 is positioned corresponding to the third rotary sealing plate 304 and the fourth rotary sealing plate 306, and the output ends of the third telescopic cylinder 303 and the fourth telescopic cylinder 305 are respectively connected to the rotating shafts on the third rotary sealing plate 304 and the fourth rotary sealing plate 306 via connecting rods. The inner side of the material housing 301 is provided with second abutment plates 309 at the positions corresponding to the third rotary sealing plate 304 and the fourth rotary sealing plate 306, forming a double-compartment structure for material discharge. The inner side of the material hopper 302 is provided with a fifth rotary sealing plate 308 via a rotating shaft and bearings. The fifth telescopic cylinder 307 is positioned on the outer side of the material hopper 302 corresponding to the position of the fifth rotary sealing plate 308, and the output end of the fifth telescopic cylinder 307 is connected to the rotating shaft on the fifth rotary sealing plate 308 via a connecting rod.

[0071] The present invention is provided with a double-compartment feeding channel 2 and a double-compartment unloading channel 3. When loading and unloading waste aluminum cans, a multi-compartment separate opening and closing structure is adopted to achieve sealing of waste aluminum can loading and unloading, reduce heat leakage during loading and unloading, greatly reduce heat loss of the paint stripping system, and improve the heat utilization rate of the paint stripping system.

[0072] The exhaust gas combustion chamber 4 and the double-layer thermal radiation paint stripping roller 1 are connected by a heat energy recovery and circulation mechanism 5. The heat energy recovery and circulation mechanism 5 is used to circulate the exhaust gas generated in the double-layer thermal radiation paint stripping roller 1 to the exhaust gas combustion chamber 4. The exhaust gas combustion chamber 4 is used to burn the exhaust gas and recover the heat energy generated in the exhaust gas combustion chamber 4 to the double-layer thermal radiation paint stripping roller 1 through the heat energy recovery and circulation mechanism 5.

[0073] The exhaust gas combustion chamber 4 includes an exhaust gas combustion shell 401, a combustion gas chamber ring 402, an ignition nozzle 403, and a guide plate 404. The exhaust gas combustion shell 401 is connected to the heat energy recovery and circulation mechanism 5. Several combustion gas chamber rings 402 are provided, and the several combustion gas chamber rings 402 are equally spaced inside the exhaust gas combustion shell 401. The several combustion gas chamber rings 402 are connected to a combustion gas delivery system. Several ignition nozzles 403 are connected to the inner side of each combustion gas chamber ring 402. Several guide plates 404 are provided, and the several guide plates 404 are alternately distributed on the inner side of the exhaust gas combustion shell 401.

[0074] This invention features an exhaust gas combustion chamber 4, employing gas combustion treatment to completely incinerate the pyrolysis and gasification of exhaust gas. The surface coating of waste aluminum cans often contains organic or inorganic compounds, frequently both. Through thermal degradation and / or oxidation, these complex compounds are reduced to their most basic forms, such as polypropylene degrading into carbon monoxide, carbon dioxide, hydrogen, and water vapor. All products emitted during the paint stripping process, except for water vapor, are harmful to the environment; therefore, they must be incinerated before being released into the atmosphere. The exhaust gas combustion chamber 4 has a temperature above 800℃, capable of completely burning off toxic and carcinogenic substances such as dioxins in the exhaust gas. The high-temperature flame and sufficient residence time prevent the regeneration of harmful organic compounds, effectively treating the exhaust gas to meet emission standards and reducing the emission of harmful gases into the environment.

[0075] The heat energy recovery and circulation mechanism 5 includes a circulating fan 501, an exhaust gas conveying pipe 502, and a heat energy recovery conveying pipe 503; the input end of the circulating fan 501 is connected to the cyclone separator 6 through the exhaust gas conveying pipe 502, the output end of the circulating fan 501 is connected to the input end of the exhaust gas combustion shell 401 through the exhaust gas conveying pipe 502, and the output end of the exhaust gas combustion shell 401 is connected to the inner cylinder 102 through the heat energy recovery conveying pipe 503;

[0076] This invention features a heat energy recovery and circulation mechanism 5, which achieves waste gas circulation combustion and heat energy recovery and utilization through a circulating fan 501, a waste gas conveying pipe 502, and a heat energy recovery conveying pipe 503. This reuses the energy released during the combustion and pyrolysis of gases, resulting in very low total energy consumption for the paint stripping system. Simultaneously, it improves the heat energy recovery and utilization rate of the paint stripping system. Based on actual on-site operation measurements, the unit energy consumption of this paint stripping system reaches 130-300 kWh / t, saving 30-50% of fuel compared to existing paint stripping furnaces.

[0077] Cyclone separator 6 is installed on the double-layer thermal radiation paint stripping drum 1 and connected to the heat energy recovery and circulation mechanism 5. Cyclone separator 6 is used to separate and clean dust particles in the exhaust gas generated inside the double-layer thermal radiation paint stripping drum 1. Cyclone separator 6 includes a cyclone separator housing 601, a dust hopper 602, an exhaust gas inlet port 603, a fixed support 604, and a rotating separation column 605. The cyclone separator housing 601 is installed on the double-layer thermal radiation paint stripping drum 1 through the exhaust gas inlet port 603. At the feeding end, the ash hopper 602 is set at the bottom of the cyclone separator shell 601. The rotating separation column 605 is rotatably set inside the cyclone separator shell 601 at the position corresponding to the exhaust gas inlet port 603 via the fixed bracket 604. The outer side of the rotating separation column 605 is provided with a ring-shaped separation slot 606. An arc-shaped guide plate 607 is provided inside the cyclone separator shell 601 at the position corresponding to the rotating separation column 605. A sloping ash ring 608 is provided in the lower part of the interior of the cyclone separator shell 601.

[0078] The present invention is equipped with a cyclone separator 6, which separates and removes fine particles such as fine powder and dust from the exhaust gas, preventing the exhaust gas from being recycled back into the double-layer thermal radiation paint stripping roller 1 after combustion and pyrolysis, ensuring that no dust and dirt are brought into the double-layer thermal radiation paint stripping roller 1, and ensuring the normal operation of the paint stripping system.

[0079] The control method for an automated paint stripping system based on recycled aluminum cans provided by this invention includes the following steps:

[0080] A. Loading waste aluminum cans:

[0081] Waste aluminum cans are fed into the feeding housing 201. At this time, the first rotating sealing plate 204 and the second rotating sealing plate 206 are both sealed against the first abutting plate 207. When the waste aluminum cans have been fed into the feeding housing 201 in a specified amount, the first telescopic cylinder 203 extends and drives the rotating shaft to rotate through the connecting rod, thereby causing the first rotating sealing plate 204 to rotate and open, so that the waste aluminum cans fall between the first rotating sealing plate 204 and the second rotating sealing plate 206. Then, the first rotating sealing plate 204 retracts and drives the first rotating sealing plate 204 to rotate and close. Then, the second telescopic cylinder 205 extends and drives the rotating shaft to rotate through the connecting rod, so that the second rotating sealing plate 206 rotates and opens, so that the waste aluminum cans fall through the feeding hopper 202 to the feeding end of the double-layer thermal radiation paint stripping roller 1.

[0082] B: Paint stripping treatment of waste aluminum cans:

[0083] Next, the outer cylinder 101 is driven to rotate by a motor and the waste aluminum can is gradually conveyed to the lower end by the spiral conveyor plate 104. During this process, the inner cylinder 102 recovers and utilizes the heat energy generated by the exhaust combustion chamber 4 through the heat energy recovery and circulation mechanism 5. The heat energy is first conveyed from the upper end to the lower end through the inner cylinder 102, and the heat energy is back-blown between the outer cylinder 101 and the inner cylinder 102 through the arc-shaped back-blowing seat 103. The heat energy then moves from the lower end to the upper end. Through the heat radiation of the inner cylinder 102, the oil and gas layer on the surface of the waste aluminum can is thermally decomposed.

[0084] C: Waste gas dust separation:

[0085] During the pyrolysis of waste aluminum cans, waste gas is generated. The waste gas is located between the outer cylinder 101 and the inner cylinder 102. At this time, the circulating fan 501 draws the waste gas into the cyclone separator 6 through the waste gas conveying pipe 502. The waste gas is blown onto the arc-shaped guide plate 607 through the waste gas inlet port 603, so that the waste gas is guided to the rotating separation column 605. During the rotation of the fixed support 604, the rotating separation column 605 separates the dust in the waste gas and discharges it through the ash hopper 602.

[0086] D. Waste gas combustion treatment:

[0087] Next, the circulating fan 501 draws the dust-laden exhaust gas separated by the cyclone separator 6 into the exhaust gas combustion chamber 4 through the exhaust gas conveying pipe 502. Then, the combustion gas is conveyed to the combustion gas chamber ring 402 through the combustion gas conveying system and ignited through the ignition nozzle 403. At this time, the exhaust gas moves through the guide plate 404 in the exhaust gas combustion shell 401 and is burned by the flame generated by the ignition nozzle 403, so that the exhaust gas is effectively burned and meets the emission standards.

[0088] E. Heat energy recovery and utilization:

[0089] The heat energy generated by the combustion of waste gas in the waste gas combustion shell 401 is transported to the inner cylinder 102 through the heat energy recovery and conveying pipe 503, so that the heat energy generated by the combustion of waste gas can be recycled.

[0090] F. Disposal of paint-stripped waste aluminum cans:

[0091] After the paint has been removed from the waste aluminum cans between the outer cylinder 101 and the inner cylinder 102, they are conveyed by a screw conveyor and fall onto the third rotary sealing plate 304 inside the unloading housing 301. Then, the third telescopic cylinder 303 extends, driving the rotating shaft to rotate via a connecting rod, thereby causing the third rotary sealing plate 304 to rotate and open. The paint-removed waste aluminum cans fall between the third rotary sealing plate 304 and the fourth rotary sealing plate 306. Next, the third telescopic cylinder 303 retracts, closing the third rotary sealing plate 304. Then, the fourth telescopic cylinder 305 extends, driving the rotation via a connecting rod. The shaft rotates, causing the fourth rotary sealing plate 306 to open. The peeled waste aluminum cans fall onto the fifth rotary sealing plate 308 inside the two hoppers 302. Then, the fourth telescopic cylinder 305 retracts, causing the fourth rotary sealing plate 306 to close. Next, the fifth telescopic cylinder 307 extends, driving the rotating shaft to rotate via a connecting rod, causing the fifth rotary sealing plate 308 to open. The peeled waste aluminum cans are discharged from the hopper 302. Then, the fifth telescopic cylinder 307 retracts, and the fifth rotary sealing plate 308 closes, completing the feeding operation of the peeled waste aluminum cans.

[0092] The control method of the automated paint stripping system based on recycled aluminum cans provided by this invention can automatically adjust the negative pressure inside the furnace, prevent flue gas leakage, and protect the production environment; automatically control the oxygen content inside the system to reduce can burn-off; and automatically control the temperature to reduce the emission of dioxins and nitrogen oxides.

[0093] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An automated paint stripping system based on recycled aluminum from aluminum cans, characterized in that, include, A double-layer thermal radiation paint stripping roller (1) is set on the system frame. The double-layer thermal radiation paint stripping roller (1) is driven to rotate by a motor and continuously thermally decomposes the oil and gas layer on the surface of the waste aluminum can by thermal radiation. The dual-compartment feeding channel (2) is located at the feeding end of the double-layer thermal radiation paint stripping roller (1) and is used to achieve sealed feeding of waste aluminum cans. The dual-compartment feeding channel (2) includes a feeding shell (201), a feeding hopper (202), a first telescopic cylinder (203), a first rotary sealing plate (204), a second telescopic cylinder (205), and a second rotary sealing plate (206). When waste aluminum cans are conveyed and fed, the waste aluminum cans are sealed and fed in the dual-compartment feeding channel (2) by alternating the opening and closing of the first rotary sealing plate (204) and the second rotary sealing plate (206). The dual-compartment feeding channel (3) is located at the feeding end of the double-layer thermal radiation paint stripping roller (1). The dual-compartment feeding channel (3) is used to achieve sealed feeding of waste aluminum cans after paint stripping. The dual-compartment unloading channel (3) includes an unloading shell (301), an unloading hopper (302), a third telescopic cylinder (303), a third rotary sealing plate (304), a fourth telescopic cylinder (305), a fourth rotary sealing plate (306), a fifth telescopic cylinder (307), and a fifth rotary sealing plate (308). When the waste aluminum cans after paint removal are conveyed and unloaded, the third rotary sealing plate (304), the fourth rotary sealing plate (306), and the fifth telescopic cylinder (307) are switched on and off in sequence to realize the sealed unloading operation of the waste aluminum cans after paint removal in the dual-compartment unloading channel (3). The exhaust gas combustion chamber (4) and the double-layer thermal radiation paint stripping roller (1) are connected by a heat energy recovery and circulation mechanism (5). The heat energy recovery and circulation mechanism (5) is used to circulate the exhaust gas generated in the double-layer thermal radiation paint stripping roller (1) to the exhaust gas combustion chamber (4). The exhaust gas combustion chamber (4) is used to burn the exhaust gas and recover the heat energy generated in the exhaust gas combustion chamber (4) to the double-layer thermal radiation paint stripping roller (1) through the heat energy recovery and circulation mechanism (5). Cyclone separator (6), the cyclone separator (6) is installed on the double-layer thermal radiation paint stripping drum (1) and connected to the heat energy recovery circulation mechanism (5). The cyclone separator (6) is used to cyclone separate and clean the dust particles in the exhaust gas generated in the double-layer thermal radiation paint stripping drum (1). The double-layer thermal radiation paint stripping roller (1) is under a slight negative pressure, and the negative pressure inside the double-layer thermal radiation paint stripping roller (1) is -5mbar; The double-layer thermal radiation paint stripping roller (1) includes an outer cylinder (101) and an inner cylinder (102). The outer cylinder (101) is rotatably mounted on the system frame via rollers. The loading end and unloading end of the outer cylinder (101) and the double-layer thermal radiation paint stripping roller (1) are rotatably connected. The inner cylinder (102) is located at the center inside the outer cylinder (101), and one end of the inner cylinder (102) extends out of the loading end of the double-layer thermal radiation paint stripping roller (1) and is connected to the heat energy recovery and circulation mechanism (5). An arc-shaped back-blowing seat (103) is provided inside the outer cylinder (101) corresponding to the unloading end of the double-layer thermal radiation paint stripping roller (1). The other end of the inner cylinder (102) is aligned with the arc-shaped back-blowing seat (103), and the inner cylinder (102) and the arc-shaped back-blowing seat (103) do not contact each other. The inner wall of the outer cylinder (101) is provided with equally spaced spiral conveyor plates (104).

2. The automated paint stripping system based on recycled aluminum cans according to claim 1, characterized in that: The feeding housing (201) is located at the feeding end of the double-layer thermal radiation paint stripping roller (1), the feeding hopper (202) is located at the bottom of the feeding housing (201), the first rotating sealing plate (204) and the second rotating sealing plate (206) are respectively rotatably located inside the upper and lower parts of the feeding housing (201) via rotating shafts and bearings, the first telescopic cylinder (203) and the second telescopic cylinder (205) are respectively located on the outside of the feeding housing (201) at positions corresponding to the first rotating sealing plate (204) and the second rotating sealing plate (206), and the output ends of the first telescopic cylinder (203) and the second telescopic cylinder (205) are respectively connected to the rotating shafts on the first rotating sealing plate (204) and the second rotating sealing plate (206) via connecting rods; The feeding housing (201) is provided with inclined first abutment plates (207) at positions corresponding to the first rotating sealing plate (204) and the second rotating sealing plate (206), forming a feeding double-compartment structure between the first rotating sealing plate (204), the second rotating sealing plate (206) and the first abutment plates (207).

3. The automated paint stripping system based on recycled aluminum cans according to claim 1, characterized in that: The feeding housing (301) is located at the feeding end of the double-layer thermal radiation paint stripping roller (1). Two feeding hoppers (302) are provided, symmetrically arranged at the bottom of the feeding housing (301). The third rotating sealing plate (304) and the fourth rotating sealing plate (306) are rotatably mounted inside the feeding housing (301) via a rotating shaft and bearings, respectively. The third telescopic cylinder (303) and the fourth telescopic cylinder (305) are respectively located outside the feeding housing (301) corresponding to the third rotating sealing plate (304) and... At the position of the fourth rotating sealing plate (306), and the output ends of the third telescopic cylinder (303) and the fourth telescopic cylinder (305) are respectively connected to the rotating shafts on the third rotating sealing plate (304) and the fourth rotating sealing plate (306) via connecting rods, a second abutting plate (309) is provided in the material feeding housing (301) at the positions corresponding to the third rotating sealing plate (304) and the fourth rotating sealing plate (306), and a material feeding double-compartment structure is formed between the third rotating sealing plate (304), the fourth rotating sealing plate (306) and the second abutting plate (309); The fifth rotating sealing plate (308) is installed inside the hopper (302) via a rotating shaft and bearings. The fifth telescopic cylinder (307) is located on the outside of the hopper (302) at a position corresponding to the fifth rotating sealing plate (308). The output end of the fifth telescopic cylinder (307) is connected to the rotating shaft on the fifth rotating sealing plate (308) via a connecting rod.

4. The automated paint stripping system based on recycled aluminum cans according to claim 1, characterized in that: The exhaust gas combustion chamber (4) includes an exhaust gas combustion shell (401), a combustion gas chamber ring (402), an ignition nozzle (403), and a guide plate (404). The exhaust gas combustion shell (401) is connected to the heat energy recovery and circulation mechanism (5). A plurality of combustion gas chamber rings (402) are provided. The plurality of combustion gas chamber rings (402) are equally spaced inside the exhaust gas combustion shell (401). The plurality of combustion gas chamber rings (402) are connected to the combustion gas delivery system. A plurality of ignition nozzles (403) are connected to the inner side of each combustion gas chamber ring (402). A plurality of guide plates (404) are provided, and the plurality of guide plates (404) are alternately distributed on the inner side of the exhaust gas combustion shell (401).

5. An automated paint stripping system based on recycled aluminum cans according to claim 4, characterized in that: The heat energy recovery circulation mechanism (5) includes a circulating fan (501), a waste gas conveying pipe (502), and a heat energy recovery conveying pipe (503); The input end of the circulating fan (501) is connected to the cyclone separator (6) through the exhaust gas conveying pipe (502), the output end of the circulating fan (501) is connected to the input end of the exhaust gas combustion shell (401) through the exhaust gas conveying pipe (502), and the output end of the exhaust gas combustion shell (401) is connected to the inner cylinder (102) through the heat energy recovery conveying pipe (503).

6. An automated paint stripping system based on recycled aluminum cans according to claim 1, characterized in that: The cyclone separator (6) includes a cyclone separator housing (601), an ash hopper (602), an exhaust gas inlet port (603), a fixed support (604), and a rotating separation column (605). The cyclone separator housing (601) is installed at the feeding end of the double-layer thermal radiation paint stripping roller (1) through the exhaust gas inlet port (603). The ash hopper (602) is installed at the bottom of the cyclone separator housing (601). The rotating separation column (605) is rotatably installed in the cyclone separator housing (601) corresponding to the exhaust gas inlet port (603) through the fixed bracket (604). The outer side of the rotating separation column (605) is provided with a ring-shaped distribution of separation slots (606).

7. An automated paint stripping system based on recycled aluminum cans according to claim 6, characterized in that: An arc-shaped guide plate (607) is provided inside the cyclone separator housing (601) at the position corresponding to the rotating separation column (605), and a sloping lower gray ring (608) is provided in the lower part of the interior of the cyclone separator housing (601).

8. A control method for an automated paint stripping system based on recycled aluminum cans according to any one of claims 1-7, characterized in that, Includes the following steps: A. Loading waste aluminum cans: Waste aluminum cans are fed into the feeding housing (201). At this time, the first rotating sealing plate (204) and the second rotating sealing plate (206) are sealed against the first abutting plate (207). When the waste aluminum cans are fed into the feeding housing (201) in a specified amount, the first telescopic cylinder (203) extends and drives the rotating shaft to rotate through the connecting rod, thereby causing the first rotating sealing plate (204) to rotate and open, so that the waste aluminum cans fall between the first rotating sealing plate (204) and the second rotating sealing plate (206). Then, the first rotating sealing plate (204) retracts and drives the first rotating sealing plate (204) to rotate and close. Then, the second telescopic cylinder (205) extends and drives the rotating shaft to rotate through the connecting rod, so that the second rotating sealing plate (206) rotates and opens, so that the waste aluminum cans fall through the feeding hopper (202) to the feeding end of the double-layer thermal radiation paint stripping roller (1). B: Paint stripping treatment of waste aluminum cans: Next, the outer cylinder (101) is driven to rotate by a motor and the waste aluminum can is gradually conveyed to the lower end by a spiral conveyor plate (104). During this process, the inner cylinder (102) recovers and utilizes the heat energy generated by the exhaust combustion chamber (4) through the heat energy recovery and circulation mechanism (5). The heat energy is first conveyed from the upper end to the lower end through the inner cylinder (102), and the heat energy is back-blown from between the outer cylinder (101) and the inner cylinder (102) through the arc-shaped back-blowing seat (103). The heat energy then moves from the lower end to the upper end. Through the heat radiation of the inner cylinder (102), the oil and gas layer on the surface of the waste aluminum can is thermally decomposed. C: Waste gas dust separation: During the thermal decomposition of waste aluminum cans, waste gas is generated. The waste gas is between the outer cylinder (101) and the inner cylinder (102). At this time, the circulating fan (501) draws the waste gas into the cyclone separator (6) through the waste gas conveying pipe (502). The waste gas is blown onto the arc-shaped guide plate (607) through the waste gas inlet port (603), so that the waste gas is guided to the rotating separation column (605). During the rotation of the fixed support (604), the dust in the waste gas is separated out and discharged through the ash hopper (602). D. Waste gas combustion treatment: Next, the circulating fan (501) draws the dust-laden exhaust gas separated by the cyclone separator (6) into the exhaust gas combustion chamber (4) through the exhaust gas conveying pipe (502). Then, the combustion gas is conveyed to the combustion gas chamber ring (402) through the combustion gas conveying system and ignited through the ignition nozzle (403). At this time, the exhaust gas is guided and moved in the exhaust gas combustion shell (401) through the guide plate (404). The flame generated by the ignition nozzle (403) burns the exhaust gas, so that the exhaust gas is effectively burned and meets the emission standards. E. Heat energy recovery and utilization: The heat energy generated by the combustion of waste gas in the waste gas combustion shell (401) is transported to the inner cylinder (102) through the heat energy recovery and conveying pipe (503) so that the heat energy generated by the combustion of waste gas can be recycled. F. Disposal of paint-stripped waste aluminum cans: After the paint has been removed from the outer cylinder (101) and the inner cylinder (102), the waste aluminum cans are conveyed by a screw conveyor and fall onto the third rotating sealing plate (304) inside the unloading housing (301). Then, the third telescopic cylinder (303) extends, driving the rotating shaft to rotate via a connecting rod, thereby causing the third rotating sealing plate (304) to rotate and open. The paint-removed waste aluminum cans fall between the third rotating sealing plate (304) and the fourth rotating sealing plate (306). Then, the third telescopic cylinder (303) retracts, causing the third rotating sealing plate (304) to close. Then, the fourth telescopic cylinder (305) extends, driving the rotating shaft to rotate via a connecting rod. The rotating shaft rotates, causing the fourth rotating sealing plate (306) to open. The peeled waste aluminum cans fall onto the fifth rotating sealing plate (308) in the two hoppers (302). Then, the fourth telescopic cylinder (305) retracts, causing the fourth rotating sealing plate (306) to close. Then, the fifth telescopic cylinder (307) extends, driving the rotating shaft to rotate through the connecting rod, causing the fifth rotating sealing plate (308) to open. The peeled waste aluminum cans are discharged from the hopper (302). Then, the fifth telescopic cylinder (307) retracts, and the fifth rotating sealing plate (308) closes, completing the feeding operation of the peeled waste aluminum cans.

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