Aluminum foil rotary drying furnace and drying method thereof

Abstract

The application discloses an aluminum foil rotary drying furnace and a drying method thereof, and relates to the field of heat treatment furnaces.The technical scheme is characterized by comprising a rack, a box body, a cylinder body rotatably arranged in the box body and a rotating device.A heating pipe body and a blowing pipe body which are relatively stationary and are in communication are arranged in the cylinder body, and a heat source is arranged in the heating pipe body.An external circulating air source is in communication with the internal pipe body to form a closed hot air circulation loop, and the hot air is sprayed out from the inside to the outside through the blowing pipe body to directly heat the material.The inner wall of the cylinder body is axially segmented to arrange flap assemblies and spiral blades.The flap assemblies are arranged at the feeding end to scoop up and scatter the material, and the spiral blades are arranged at the discharging end to rapidly guide the material.The application eliminates the heat resistance of the cylinder wall by utilizing internal circulation and direct blowing heating, significantly improves the heat efficiency and reduces the energy consumption, effectively solves the technical problems of easy agglomeration and uneven drying of the aluminum foil by matching the segmented material processing structure, and has the advantages of high drying capacity, small equipment size and the like.

Description

Technical Field

[0001] This invention relates to the field of heat treatment furnaces, and in particular to a rotary aluminum foil drying furnace and its drying method. Background Technology

[0002] In the recycling process of waste aluminum foil, the surface of the aluminum foil after the cleaning process is covered with a large amount of water. It must be thoroughly dehydrated by drying equipment in order to meet the process requirements of subsequent smelting or reprocessing.

[0003] Existing aluminum foil drying operations typically employ externally heated rotary drying equipment. This type of equipment often has a large main structure, typically consisting of a long cylinder about ten meters in length, assembled from multiple drum sections, to ensure sufficient travel. Its working principle usually involves installing heating devices such as electric heating tubes or burners on the lower exterior of the cylinder. These devices first heat the cylinder wall, and the heat is then transferred to the aluminum foil inside the cylinder via thermal conduction through the metal cylinder wall.

[0004] However, this traditional heating method has revealed technical drawbacks in practical applications. Because the heat source is located externally, heat must penetrate the thick metal cylinder wall to be transferred to the internal material. This not only results in high thermal resistance but also causes a significant amount of heat to be directly lost to the external environment, leading to extremely low heat utilization. In actual operation, to maintain the required drying temperature, the equipment's heating power is often kept high, causing not only substantial energy waste but also significantly increasing the company's operating costs.

[0005] Besides energy consumption, the physical properties of aluminum foil itself also pose a challenge to the drying effect of traditional equipment. Aluminum foil is a lightweight, sheet-like, and easily deformable material that readily adheres to each other when wet. In a traditional rotating drum, these aluminum foils tend to accumulate at the bottom of the drum, forming clumps that are dry on the outside but wet on the inside. During the drum's rotation, these clumps of aluminum foil are difficult to break up and toss effectively, preventing heat from penetrating deep into the aluminum foil layer and resulting in uneven and incomplete drying. Summary of the Invention

[0006] The purpose of this invention is to provide an aluminum foil rotary drying oven, which has the advantages of high drying capacity and small equipment size.

[0007] The above-mentioned technical objective of the present invention is achieved through the following technical solution: A rotary aluminum foil drying oven includes a frame, a housing mounted on the frame, a cylinder rotatably mounted inside the housing, and a rotary device for driving the cylinder to rotate; one end of the housing is provided with a feed pipe, and the other end is provided with a discharge port; It also includes interconnected heating tubes and air blowing tubes, which are located inside the cylinder and are stationary relative to the cylinder; the air blowing tube is located near the feed pipe and has multiple air blowing ports on its outer circumferential surface. It also includes a heat source and a circulating air source. At least part of the heat source is located inside the heating tube. The circulating air source is provided with an air inlet pipe and a return air pipe. The circulating air source is connected to the heating tube and the blowing pipe through the air inlet pipe. The airflow generated by the circulating air source enters the heating tube and the blowing pipe through the air inlet pipe. After being heated by the heat source, it is sprayed out from the air outlet into the inside of the cylinder. The inside of the cylinder is connected to the circulating air source through the return air pipe. The airflow inside the cylinder flows back to the circulating air source through the return air pipe, thereby forming a hot air circulation loop. It also includes a flap assembly and a spiral blade. The flap assembly is located on the inner wall of the cylinder near the feed pipe, and the spiral blade is located on the inner wall of the cylinder near the discharge port.

[0008] Further configuration: multiple sets of flap assemblies are distributed along the circumference of the cylinder, and any flap in the flap assembly is inclined relative to the axis of the cylinder, and the body of the flap is spirally arranged.

[0009] Further configuration: Any group of flap components includes multiple flaps arranged sequentially, with the consecutive flaps arranged along the same spiral line.

[0010] Further configuration: The heat source is an electric heating rod or a gas radiant tube disposed inside the heating tube body; the heating tube body is located on the side of the cylinder body near the discharge port, and the heating tube body passes through the box body and is connected to the end of the air inlet pipe.

[0011] Further configuration: An air-gathering guide plate is provided between the heating tube and the blowing tube; multiple air-gathering guide plates are arranged at intervals along the inner circle of the blowing tube to form a conical cage structure, with its large end connected to the heating tube and its small end connected to the blowing tube, for accelerating the introduction of hot air into the blowing tube.

[0012] Further configuration: It also includes a connecting pipe installed on the box body; the discharge end of the cylinder extends into the interior of the connecting pipe, and a relative rotational sealing fit is formed between the outer wall of the cylinder and the inner wall of the connecting pipe; The connecting pipe is provided with an air inlet pipe, a return air pipe, and a dehumidification pipe on its end face. The air inlet pipe is suitable for connecting the heating tube body and the air inlet pipe. The return air pipe is suitable for connecting the inside of the cylinder body and the return air pipe. The discharge port is located at the bottom of the connecting pipe.

[0013] Further configuration: The air inlet pipe is located on the axis of the cylinder, the height of the return air pipe is higher than the height of the air inlet pipe, and the height of the dehumidification pipe is higher than the height of the return air pipe; it also includes a dehumidification system, which includes a steam exhaust pipe connected to the dehumidification pipe and a negative pressure mechanism connected to the steam exhaust pipe; the hot and humid gas inside the cylinder is discharged through the steam exhaust pipe under the action of the negative pressure mechanism.

[0014] Further features include an anti-bridging mechanism, which comprises a flushing pipe and a feed air source; one end of the flushing pipe extends into the feed pipe and its outlet faces the inside of the cylinder, while the other end is connected to the feed air source.

[0015] The present invention also provides a drying method using the above-mentioned aluminum foil rotary drying oven, comprising the following steps: Step S1: System startup; Start the rotary device to drive the cylinder to rotate, and turn on the circulating air source and heat source; Step S2: Establish hot air circulation; The airflow generated by the circulating air source is forced into the heating tube through the air inlet pipe. After being heated by the heat source, it becomes a high-temperature dry gas, which then enters the blowing pipe and is sprayed into the cylinder from the center outward through the blowing port on its surface. Step S3: Feeding and anti-clogging; The aluminum foil to be processed is fed in through the feed pipe, and the anti-bridging mechanism is activated at the same time. The air jet is sprayed into the feed pipe through the air jet pipe to break up the aluminum foil and push it into the cylinder. Step S4: Drying and dehumidification; Aluminum foil rolls inside the cylinder with the flap assembly to form a material curtain, and exchanges heat and mass with high-temperature hot air; part of the warm and humid gas after heat exchange returns to the circulating air source through the return air pipe to achieve closed circulation, while the other part of the high-humidity exhaust gas is discharged from the box through the steam exhaust pipe under the action of the negative pressure mechanism. Step S5, Discharge; The dried aluminum foil moves to the discharge end under the guidance of the rotating cylinder and the spiral blades, and is discharged from the discharge port.

[0016] Further, in step S3, the anti-bridging mechanism executes a pneumatic pulse bridging method, adjusting the feed air source through a controller to control the output of a high-frequency alternating pulse airflow from the air duct; the specific steps are as follows: The aerodynamic impact cycle is set, which consists of alternating pressurization impact phases and depressurization relaxation phases. During the pressurization and impact phase: control the peak air pressure output of the feed air source to make the air jet spray high-speed jet into the feed pipe through the air jet pipe; During the depressurization and relaxation phase: the air supply is cut off or the air supply pressure is reduced, causing the flow field pressure in the feed pipe to decrease; the system cycles through the pressurization and pressure relief phases, forming an aerodynamic oscillation flow field in the outlet area of ​​the air duct.

[0017] In summary, the present invention has the following beneficial effects: First, this invention changes the inefficient traditional aluminum foil drying oven's reliance on an external heating source to heat the cylinder wall and then conduct heat to the material by setting relatively stationary heating pipes and blowing pipes inside the cylinder, and forming a hot air circulation loop with a circulating air source. The centrally located blowing pipes radially spray hot air outwards, allowing the high-temperature airflow to directly impact and envelop the tumbling aluminum foil material. This direct heat exchange eliminates the thermal resistance of the cylinder wall, significantly reducing ineffective heat loss to the external environment, thereby significantly improving thermal efficiency while reducing heating power.

[0018] By arranging flap components and spiral blades in sections along the axial direction on the inner wall of the cylinder, the flap components located on the feed pipe side can continuously lift and scatter the aluminum foil that is prone to accumulating and agglomerating in the initial stage of drying, forcibly breaking up the material layer, increasing the contact surface area between the aluminum foil and the hot air, and effectively solving the technical problem of uneven and incomplete internal drying caused by the accumulation of aluminum foil; while the spiral blades located on the discharge port side play a role in quickly guiding the material in the later stage of drying, ensuring that the dried material can be discharged smoothly, preventing the material from stagnating at the discharge end, and ensuring the continuity and stability of production.

[0019] A closed-loop hot air circulation system, consisting of a circulating air source, inlet duct, heating pipe, blowing duct, and return duct, allows the warm gas after heat exchange inside the cylinder to be recovered by the circulating air source through the return duct and reintroduced into the heating pipe for supplemental heating. This process achieves cascaded heat utilization, significantly reducing exhaust heat loss during the drying process and further lowering the overall energy consumption of the equipment. Thanks to the high heat transfer efficiency of the internal circulation direct-blowing heating and the high dispersion effect of the flap assembly, this technical solution achieves higher drying capacity while shortening the cylinder length, thereby reducing the overall size and footprint of the equipment and lowering factory space requirements.

[0020] Secondly, in this invention, by arranging multiple sets of spiral-shaped flap assemblies inclined relative to the axis along the circumference of the cylinder, the spiral curved surface structure of the flap body enables the flap to smoothly scoop and loosen the material pile at the bottom, effectively reducing the cutting resistance and preventing the material from accumulating and compacting on the plate surface. At the same time, as the inclined spiral flap lifts the material with the rotation of the cylinder, it causes the material to slide along the spiral curved surface and fall in a divergent state, forming a uniformly distributed material curtain. This not only effectively breaks the liquid bridge adhesion formed between aluminum foil layers due to surface tension and prevents agglomeration during the drying process, but also gives the material an axial velocity component moving towards the discharge end. Thus, while maximizing the gas-solid contact area to improve heat exchange efficiency, it also achieves effective control of the axial conveying speed of the material, ensuring that the residence time of the aluminum foil in the cylinder meets the process requirements of deep drying.

[0021] Third, by designing any set of flap components as multiple discrete flaps arranged sequentially along the same spiral line, this discrete spiral arrangement breaks the overall forced pushing mode of the material by the continuous spiral blades during the rotation of the cylinder by utilizing the physical gap between adjacent flaps. This allows the sheet aluminum foil to be guided forward by the spiral trajectory while generating frequent misaligned drops and tumbling movements through the gaps between the plates, effectively reducing the compressive stress inside the material layer and avoiding the agglomeration and densification phenomenon formed by continuous compression of the wet aluminum foil during the conveying process. Thus, while ensuring that the material moves towards the discharge end at a controllable speed, the continuous loosening and deagglomeration of the aluminum foil layer is achieved, greatly improving the permeability of hot air penetrating the material layer and the uniformity of drying.

[0022] Fourth, by setting a relatively stationary connecting pipe at the discharge end of the chamber and forming a dynamic-static seal with the rotating cylinder, the air inlet pipe, return air pipe, dehumidification pipe, and discharge port are centrally arranged on the connecting pipe, effectively solving the connection problem between the internal pipeline of the rotating cylinder and the external fixed circulating air source and negative pressure dehumidification system. This avoids the complex rotary joint structure and seal failure risk caused by directly connecting pipes on the rotating parts. At the same time, while ensuring the normal rotation operation of the cylinder, hot air introduction, waste heat recovery, moisture discharge, and material gravity discharge are achieved simultaneously, ensuring the sealing and stability of the hot air circulation loop, simplifying the tail structure of the equipment, and reducing maintenance difficulty.

[0023] Fifth, a dehumidification system including a steam exhaust pipe and a negative pressure mechanism is installed. Utilizing the pressure gradient generated by the negative pressure mechanism, the high-humidity gas formed by the evaporation of moisture from the aluminum foil surface during the drying process can be rapidly separated from the hot air circulation field and forcibly discharged. This effectively avoids the problems of relative humidity saturation and decreased mass transfer driving force caused by moisture accumulation in closed-loop hot air circulation. Simultaneously, this forced dehumidification, independent of the return air circulation, ensures that the inside of the cylinder is always maintained in a low-humidity drying environment conducive to rapid moisture evaporation, guaranteeing the thoroughness and consistency of aluminum foil drying and preventing secondary condensation of water vapor on the material surface or in dead corners of the equipment.

[0024] Sixth, by installing a jet pipe pointing towards the cylinder inside the feed pipe and cooperating with the feed air source, the high-speed directional airflow ejected from the jet pipe acts on the material at the feed pipe, providing additional axial thrust and loosening kinetic energy for the lightweight and moist aluminum foil. This effectively overcomes the bridging and retention phenomena at the feed inlet caused by high frictional resistance and strong interlayer adhesion during the gravity sliding process of wet aluminum foil. At the same time, the continuous purging effect of the airflow can forcibly disperse the material gathered at the throat of the feed pipe and quickly guide it into the cylinder, ensuring the smoothness of the feed channel and the continuous stability of the feeding process, eliminating the risk of equipment downtime caused by feed blockage.

[0025] Seventh, the anti-bridging mechanism employs a pneumatic pulse bridging method. Utilizing the high-momentum shock wave generated instantaneously by the pulsed airflow, it produces a mechanical impact effect similar to a pneumatic hammer on the liquid bridges formed between layers of wet aluminum foil due to surface tension of moisture. This instantaneous shearing force is far greater than the thrust of a constant airflow, more effectively forcibly disintegrating and breaking up clumps of aluminum foil. Furthermore, through alternating high-pressure impact and low-pressure relaxation, the flow field within the feed pipe 102 generates periodic pressure fluctuations. These pressure fluctuations force the aluminum foil material to vibrate at high frequency against the pipe wall, effectively destroying the static friction and adhesion layer between the material and the pipe wall. This fundamentally eliminates the physical basis for material adhesion and bridging. Compared to continuous high-pressure blowing, this method significantly reduces the consumption of compressed air or wind energy, achieving high-efficiency operation of the anti-clogging function. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural diagram of an aluminum foil rotary drying oven. Figure 1 ; Figure 2 This is a three-dimensional structural diagram of an aluminum foil rotary drying oven. Figure 2 ; Figure 3 This is a top view of an aluminum foil rotary drying oven; Figure 4 yes Figure 3 BB section view in the middle; Figure 5This is a 3D schematic diagram of the flip panel assembly; Figure 6 This is a side view of the flip panel assembly; Figure 7 This is a schematic diagram of the axial end face of the flap assembly; Figure 8 This is a schematic diagram of the end structure of an aluminum foil rotary drying oven; Figure 9 This is a three-dimensional schematic diagram of the connecting pipe.

[0027] In the diagram, 10 is the frame; 20 is the housing; and 30 is the cover plate. 100. Cylinder body; 101. Air concentrator and guide plate; 102. Feed pipe; 103. Discharge port; 104. Air inlet pipe; 105. Return air pipe; 106. Heating tube; 107. Air blowing tube; 108. Air outlet; 109. Spiral blade; 110. Flushing duct; 111. Feed air source; 120. Insulation layer; 150. Connecting pipe; 151. Dehumidification pipe; 130. Steam exhaust pipe; 131. Negative pressure mechanism; 140. Flip-up assembly; 141. First flip-up; 142. Second flip-up; 143. Third flip-up; 144. Fourth flip-up; 200. Rotary device; 201. Driving wheel; 202. Driven wheel; 203. Transmission mechanism; 300. Heat source; 400. Circulating air source; 401. Air inlet duct; 402. Return air duct. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to the accompanying drawings.

[0029] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0030] A rotary aluminum foil drying oven, such as Figure 1 , Figure 2 and Figure 3 as well as Figure 4As shown, the device includes a frame 10, a housing 20, a cylinder 100, and a rotating device 200. The housing 20 is mounted on the frame 10, and the cylinder 100 is rotatably disposed inside the housing 20. The rotating device 200 drives the cylinder 100 to rotate relative to the housing 20. A feed pipe 102 is arranged at one end of the housing 20 as the material inlet; a discharge port 103 is arranged at the other end of the housing 20 as the material outlet.

[0031] The drying oven also includes interconnected heating tubes 106 and air blowing pipes 107 inside the cylinder 100. Both the heating tubes 106 and air blowing pipes 107 are located within the inner cavity of the cylinder 100 and are fixed in place, remaining stationary relative to the cylinder 100 and not rotating with it. Spatially, the air blowing pipe 107 is located near the feed pipe 102, and its outer surface has multiple air nozzles 108 for discharging airflow in all directions. To optimize the hot air flow field and protect the heating elements, the heating tube 106 has a closed, non-porous wall, while the air blowing pipe 107 has air nozzles 108 on its outer surface. The circulating airflow is heated within the heating tubes 106, flows to the air blowing pipe 107, and is ejected from the air nozzles 108. This layout of rear-end heating and front-end air outlet ensures, on the one hand, the physical isolation between the high-temperature heat source 300 and the dusty environment, preventing aluminum foil debris from entering the heating core; on the other hand, it allows the hot air to be concentrated and blown towards the wet material near the feed end, quickly removing moisture.

[0032] To achieve internal hot air circulation, the device is equipped with a heat source 300 and a circulating air source 400. At least a portion of the heat source 300 is housed inside the heating tube 106. The circulating air source 400 is connected to an inlet pipe 401 and a return pipe 402. The circulating air source 400 is connected to the heating tube 106 and the blowing pipe 107 via the inlet pipe 401. During operation, the airflow generated by the circulating air source 400 enters the heating tube 106 and the blowing pipe 107 via the inlet pipe 401. The airflow is heated as it passes through the heat source 300 and is then ejected from the blowing port 108 into the interior of the cylinder 100. The internal space of the cylinder 100 is connected to the circulating air source 400 via the return pipe 402, allowing the airflow inside the cylinder 100 to flow back to the circulating air source 400 via the return pipe 402, thereby forming a closed hot air circulation loop within the system.

[0033] In addition, the inner wall of the cylinder 100 is provided with material handling structures in sections, including a flap assembly 140 and a spiral blade 109. The flap assembly 140 is fixed to one end of the inner wall of the cylinder 100 near the feed pipe 102; the spiral blade 109 is fixed to one end of the inner wall of the cylinder 100 near the discharge port 103.

[0034] like Figure 5 , Figure 6 and Figure 7 As shown, the flap assembly 140 is fixedly connected to the inner circumferential wall of the cylinder 100, and multiple sets are distributed at intervals along the circumferential direction of the cylinder 100.

[0035] Specifically, each set of flap assembly 140 includes multiple flaps arranged sequentially along the axial direction of the cylinder 100. These continuously arranged flaps are arranged along the same spiral trajectory line. In terms of the shape of an individual flap, the flap is inclined relative to the central axis of the cylinder 100, and the body structure of the flap is a spirally curved shape.

[0036] As shown in the attached diagram, the housing 20 is divided into multiple units along its length. One unit contains a flap assembly 140 comprising a first flap 141, a second flap 142, a third flap 143, and a fourth flap 144 arranged sequentially. The first flap 141, second flap 142, third flap 143, and fourth flap 144 are sequentially fixed to the inner wall of the cylinder 100 along the material conveying direction. Specifically, the first flap 141 is located at the starting end of the unit's feeding section; the second flap 142 is axially adjacent to the first flap 141 but staggered circumferentially; the third flap 143 follows immediately after the second flap 142; and the fourth flap 144 is located at the ending end of the unit's discharging section. Although the first flap 141, second flap 142, third flap 143, and fourth flap 144 are not directly connected end-to-end, their arrangement together constitutes a discontinuous spiral material guiding structure.

[0037] like Figure 3 , Figure 4 As shown, the heating tube 106 is located inside the cylinder 100 near the discharge port 103. The heating tube 106 passes through the side wall of the housing 20 and is fixedly connected to the end of the air inlet pipe 401. The heat source 300 is installed inside the heating tube 106. An air-concentrating guide plate 101 is provided between the heating tube 106 and the air-blowing pipe 107. Multiple air-concentrating guide plates 101 are arranged at intervals along the inner ring of the air-blowing pipe 107. The air-concentrating guide plate 101 has a conical cage-like structure, with its large end connected to the heating tube 106 and its small end connected to the air-blowing pipe 107, used to accelerate the introduction of hot air into the air-blowing pipe 107.

[0038] In this embodiment, the heat source 300 can be an electric heating rod installed inside the heating tube body 106, or it can be a gas radiant tube.

[0039] In this embodiment, the inner wall of the cylinder 100 has a heat insulation layer 120. Multiple sets of the heat insulation layer extend along the axial direction of the heating pipe 106 and the blowing pipe 107, and cover the heating pipe 106 and the blowing pipe 107.

[0040] like Figure 8 and Figure 9As shown, the drying oven also includes a connecting pipe 150 disposed on the housing 20. The discharge end of the cylinder 100 extends outward and into the internal cavity of the connecting pipe 150, and a relative rotational sealing fit is formed between the outer wall surface of the cylinder 100 and the inner wall surface of the connecting pipe 150.

[0041] The connecting pipe 150 is provided with an air inlet pipe 104, a return air pipe 105, and a dehumidification pipe 151 on its end face. The air inlet pipe 104 is used to connect the heating tube 106 located inside the cylinder 100 to the external air inlet pipe 401; the return air pipe 105 is used to connect the internal space of the cylinder 100 to the external return air pipe 402. In addition, the discharge port 103 is provided at the bottom of the connecting pipe 150.

[0042] The air inlet pipe 104 is located at the center of the end face of the connecting pipe 150 and is situated on the central axis of the cylinder 100. The return air pipe 105 is positioned above the air inlet pipe 104, with its center height higher than that of the air inlet pipe 104. The dehumidification pipe 151 is positioned above the return air pipe 105, with its center height higher than that of the return air pipe 105.

[0043] like Figure 8 and 9 As shown, the aluminum foil rotary drying oven is also equipped with a dehumidification system. The dehumidification system includes a steam exhaust pipe 130 and a negative pressure mechanism 131. One end of the steam exhaust pipe 130 is fixedly connected to the dehumidification connector 151 of the connecting pipe 150, so that the steam exhaust pipe 130 is connected to the internal space of the cylinder 100 through the dehumidification connector 151. The negative pressure mechanism 131 is installed at the end of the steam exhaust pipe 130 away from the connecting pipe 150 and is connected to the steam exhaust pipe 130. In this embodiment, the negative pressure mechanism 131 can specifically be a centrifugal fan.

[0044] like Figure 1 and 4 As shown, the aluminum foil rotary drying oven also includes an anti-bridging mechanism. The anti-bridging mechanism mainly consists of a flushing pipe 110 and a feed air source 111. The flushing pipe 110 is located at the feed pipe 102, with one end extending through the wall of the feed pipe 102 into its internal cavity, and the outlet of that end facing the interior of the cylinder 100. The other end of the flushing pipe 110, located outside the feed pipe 102, is connected to the feed air source 111. In this embodiment, the feed air source 111 can specifically be a high-pressure blower.

[0045] like Figure 4As shown, the rotary device 200 is mounted on the frame 10 and is used to drive the cylinder 100 to rotate. The rotary device 200 includes a drive motor, a driving wheel 201, a driven wheel 202, and a transmission mechanism 203. The drive motor is fixedly mounted on the frame 10, and the driving wheel 201 is connected to the power output end of the drive motor. The driven wheel 202 is coaxially sleeved and fixed on the outer peripheral wall of the cylinder 100. The driving wheel 201 is connected to the driven wheel 202 through the transmission mechanism 203, so that the rotation of the driving wheel 201 can be transmitted to the driven wheel 202.

[0046] The transmission mechanism 203 can adopt a chain drive structure, in which the driving wheel 201 and the driven wheel 202 are both sprockets, and the chain is tensioned and sleeved on the driving wheel 201 and the driven wheel 202; or the transmission mechanism 203 can also adopt a gear drive structure, in which the driving wheel 201 is a small gear, the driven wheel 202 is a large gear ring fixed on the cylinder 100, and the driving wheel 201 and the driven wheel 202 directly mesh.

[0047] Furthermore, to facilitate routine maintenance and repair of the equipment, the top cover 30 of the housing 20 is designed to be detachable. Operators can directly clean and maintain the flap assembly 140 or the heating tube 106 inside the cylinder 100 by removing the cover 30, without having to disassemble the entire equipment.

[0048] In a typical application, the total length of the rotary aluminum foil dryer is designed to be approximately 7 meters. Through the aforementioned internal circulation heating and segmented material handling structure, this equipment can achieve an aluminum foil drying capacity of up to 200 kg / hour when the operating power is controlled within the range of 30 kW to 40 kW. The dried aluminum foil is free of water stains and is evenly dispersed. Compared to previous equipment, the total power consumption is significantly reduced to only about one-third of that of traditional equipment. The overall length is shortened by approximately 40% compared to traditional equipment. The maximum processing capacity can reach 200 kg / hour, with a daily processing capacity of approximately 2 tons, far exceeding the 120 kg / hour level of traditional equipment, effectively resolving the contradiction between large plant space requirements and insufficient production capacity.

[0049] The working principle and operation process of this invention are as follows: After the equipment is started, the rotary device 200 drives the cylinder 100 to rotate, and the circulating air source 400 and the heat source 300 are turned on. The airflow generated by the circulating air source 400 is forced into the heating tube 106 through the air inlet pipe 401. After being heated by the heat source 300, it becomes a high-temperature dry gas, which then enters the blowing pipe 107 and is sprayed out radially into the cylinder 100 through the blowing port 108 on its surface.

[0050] At this time, the aluminum foil to be processed enters the cylinder 100 through the feed pipe 102. During the feeding stage, the anti-bridging mechanism's air jet pipe 110 sprays out a high-speed airflow, which, together with the feed air source 111, disperses the aluminum foil and pushes it into the cylinder 100 to prevent blockage. After entering the cylinder 100, the aluminum foil is continuously lifted and scattered by the flap assembly 140, forming a loose material curtain, which undergoes sufficient heat and mass exchange with the high-temperature hot air sprayed from the center outward, and the moisture evaporates rapidly.

[0051] After heat exchange, the warm and humid gas, under the suction of the circulating air source 400, flows back to the circulating air source 400 through the return air pipe 105 and the return air pipe 402, and is reintroduced into the heating tube 106 for heating, forming a closed-loop thermal energy cycle. Simultaneously, the negative pressure mechanism 131 of the dehumidification system operates, forcibly extracting some of the high-humidity exhaust gas from the circulation loop and discharging it outside the housing 20 through the dehumidification interface and the steam exhaust pipe 130, maintaining a low-humidity, dry environment inside the cylinder 100. As the cylinder 100 continues to rotate, the dried aluminum foil, guided by gravity and the spiral blades 109, gradually moves to the discharge end and is finally discharged from the discharge port 103, completing the continuous drying operation.

[0052] In the operation control of the anti-bridging mechanism, a pneumatic pulse bridging method is adopted. The feed air source 111 is regulated by a frequency converter or an electromagnetic pulse valve installed on the air duct 110 to control the airflow ejected from the outlet of the air duct 110 to be a high-frequency intermittent pulse airflow, rather than a constant continuous airflow.

[0053] The specific pulse control logic is as follows: A flow impact cycle is set, which includes a high-pressure impact stage and a low-pressure relaxation stage. During the high-pressure impact stage, the feed air source 111 instantly outputs maximum air pressure, and the air jet from the air duct 110 ejects a high-speed air jet, using the momentum of the airflow to directly break the aluminum foil accumulated in the feed pipe 102. Then, it immediately switches to the low-pressure relaxation stage, significantly reducing the air pressure or stopping the air supply. The instantaneous unloading of the flow field pressure generates a negative pressure backflow effect, causing the loosened aluminum foil clump to experience slight rebound and vibration within the feed pipe 102. The control system cyclically executes the above impact and relaxation process, creating a flow field environment at the outlet of the air duct 110 similar to an aerodynamic oscillation wave.

[0054] The above embodiments are merely explanations of the present invention and are not intended to limit the present invention. After reading this specification, those skilled in the art can make modifications to these embodiments without contributing any inventive step, but as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A rotary aluminum foil drying oven, comprising a frame (10), a housing (20) mounted on the frame (10), a cylinder (100) rotatably mounted inside the housing (20), and a rotary device (200) for driving the cylinder (100) to rotate; one end of the housing (20) is provided with a feed pipe (102), and the other end is provided with a discharge port (103); characterized in that: It also includes a heating tube (106) and a blowing tube (107) that are interconnected. The heating tube (106) and the blowing tube (107) are disposed inside the cylinder (100) and are stationary relative to the cylinder (100). The blowing tube (107) is located near the feed pipe (102) and has multiple air outlets (108) on its outer peripheral surface. It also includes a heat source (300) and a circulating air source (400), at least a portion of which is located inside the heating tube (106); the circulating air source (400) is provided with an air outlet pipe (401) and a return air pipe (402), the circulating air source (400) is connected to the heating tube (106) and the blowing pipe (107) through the air outlet pipe (401), the airflow generated by the circulating air source (400) enters the heating tube (106) and the blowing pipe (107) through the air outlet pipe (401), and after being heated by the heat source (300), it is sprayed out from the air outlet (108) into the interior of the cylinder (100); the interior of the cylinder (100) is connected to the circulating air source (400) through the return air pipe (402), and the airflow inside the cylinder (100) flows back to the circulating air source (400) through the return air pipe (402), thereby forming a hot air circulation loop; It also includes a flap assembly (140) and a spiral blade (109). The flap assembly (140) is located on the inner wall of the cylinder (100) near the end of the feed pipe (102), and the spiral blade (109) is located on the inner wall of the cylinder (100) near the end of the discharge port (103). It also includes an anti-bridging mechanism, which includes a flushing pipe (110) and a feed air source (111); one end of the flushing pipe (110) extends into the feed pipe (102) and the outlet faces the inside of the cylinder (100), and the other end is connected to the feed air source (111).

2. The aluminum foil rotary drying oven according to claim 1, characterized in that: Multiple sets of flap assembly (140) are distributed circumferentially along the cylinder (100). Any flap in the flap assembly (140) is inclined relative to the axis of the cylinder (100), and the body of the flap is spirally arranged.

3. The aluminum foil rotary drying oven according to claim 2, characterized in that: Each set of flap assembly (140) includes multiple flaps arranged sequentially, with the consecutive flaps arranged along the same spiral line.

4. The aluminum foil rotary drying oven according to claim 1, characterized in that: The heat source (300) is an electric heating rod or a gas radiant tube installed inside the heating tube body (106); the heating tube body (106) is located on the side of the cylinder (100) near the discharge port (103), and the heating tube body (106) passes through the box body (20) and is connected to the end of the air outlet pipe (401).

5. The aluminum foil rotary drying oven according to claim 1, characterized in that: An air-gathering guide plate (101) is provided between the heating tube (106) and the blowing tube (107); multiple air-gathering guide plates (101) are arranged at intervals along the inner ring of the blowing tube (107) to form a conical cage structure, with its large end connected to the heating tube (106) and its small end connected to the blowing tube (107), for accelerating the introduction of hot air into the blowing tube (107).

6. The aluminum foil rotary drying furnace according to claim 1, characterized by: It also includes a connecting pipe (150) disposed on the box body (20); the discharge end of the cylinder (100) extends into the interior of the connecting pipe (150), and a relative rotational sealing fit is formed between the outer wall of the cylinder (100) and the inner wall of the connecting pipe (150); The end face of the connecting pipe (150) is provided with an air inlet pipe (104), a return air pipe (105) and a dehumidification pipe (151). The air inlet pipe (104) is suitable for connecting the heating tube (106) and the air outlet pipe (401). The return air pipe (105) is suitable for connecting the inside of the cylinder (100) and the return air pipe (402). The discharge port (103) is located at the bottom of the connecting pipe (150).

7. The aluminum foil rotary drying oven according to claim 6, characterized in that: The air inlet pipe (104) is located on the axis of the cylinder (100), the height of the return air pipe (105) is higher than the height of the air inlet pipe (104), and the height of the dehumidification pipe (151) is higher than the height of the return air pipe (105); it also includes a dehumidification system, which includes a steam exhaust pipe (130) connected to the dehumidification pipe (151) and a negative pressure mechanism (131) connected to the steam exhaust pipe (130); the hot and humid gas inside the cylinder (100) is discharged through the steam exhaust pipe (130) under the action of the negative pressure mechanism (131).

8. A drying method using the aluminum foil rotary drying oven as described in claim 1, characterized in that, Includes the following steps: Step S1: System startup; Start the rotary device (200) to drive the cylinder (100) to rotate, and turn on the circulating air source (400) and heat source (300); Step S2: Establish hot air circulation; The airflow generated by the circulating air source (400) is pressed into the heating tube (106) through the air outlet (401). After being heated by the heat source (300), it becomes a high-temperature dry gas, which then enters the blowing tube (107) and is sprayed into the cylinder (100) from the center outward in a radial pattern through the blowing port (108) on its surface. Step S3: Feeding and anti-clogging; The wet aluminum foil to be processed is fed into the feed pipe (102), and the anti-bridging mechanism is activated at the same time. The air jet is sprayed into the feed pipe (102) through the air pipe (110) to break up the wet aluminum foil and push it into the cylinder (100). Step S4: Drying and dehumidification; Aluminum foil tumbles inside the cylinder (100) with the flap assembly (140) to form a material curtain, and exchanges heat and mass with the high-temperature hot air; part of the warm and humid gas after heat exchange returns to the circulating air source (400) through the return air pipe (402) to achieve closed circulation, and the other part of the high humidity exhaust gas is discharged outside the box (20) through the steam exhaust pipe (130) under the action of the negative pressure mechanism (131); Step S5: Discharge; The dried aluminum foil moves to the discharge end under the guidance of the rotating cylinder (100) and the spiral blades (109) and is discharged from the discharge port (103); In step S3, the anti-bridging mechanism executes a pneumatic pulse bridging method, adjusting the feed air source (111) through the controller to control the output of high-frequency alternating pulse airflow from the air duct (110); the specific steps are as follows: The aerodynamic impact cycle is set, which consists of alternating pressurization impact phases and depressurization relaxation phases. During the pressurization and impact stage: control the peak air pressure output of the feed air source (111) to make the air duct (110) spray a high-speed jet into the feed pipe (102); During the depressurization and relaxation phase: cut off the air supply or reduce the air supply pressure to reduce the flow field pressure in the feed pipe (102); The system cycles through the pressurization and depressurization phases, creating an aerodynamic oscillation flow field in the outlet region of the air duct (110).

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