Modular aluminum foil annealing furnace

Abstract

The application discloses a modular aluminum foil annealing furnace and relates to the field of heat treatment equipment.The technical scheme is as follows: a wind source and a heating device are externally arranged on the top of a furnace body; a heat conduction layer and a heat conduction rod are arranged on the inner wall of the furnace body; the high-temperature airflow after being heated is transported through the air inlet air duct arranged on the top wall and the side wall of the furnace body and in contact with the heat conduction layer, so that the whole inner wall of the furnace body is preheated into a large-area and uniform planar heat source; the air blowing air duct arranged on the bottom wall of the furnace body sends the air into the furnace from bottom to top, and the air is recovered through the air return air duct on the top wall, so that an orderly vertical circulating airflow is formed.The application converts the impingement point heat source into a moderate planar heat source, builds an efficient heat recovery path and a uniform vertical airflow field, fundamentally solves the technical problems of low heat efficiency and poor temperature uniformity of the external scheme, meanwhile, the advantages of easy maintenance of the components are retained, and the unification of high thermal performance and high operation reliability is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of heat treatment equipment, in particular to a modular aluminum foil annealing furnace. BACKGROUND

[0002] After cold rolling, the aluminum foil will be work-hardened, resulting in a decrease in plasticity and an increase in hardness, which cannot meet the requirements of subsequent processing and use. Therefore, annealing treatment is needed to eliminate internal stress, restore the plasticity of the material and obtain a uniform microstructure. The aluminum foil annealing furnace is the core equipment for completing this key process, and the uniformity of the furnace temperature and the reliability of the operation directly determine the quality and production efficiency of the final product.

[0003] At present, the mainstream aluminum foil annealing furnace in the industry generally adopts an internal heating and circulating design in structure. This design integrates and installs the electric heating elements or gas burners that realize the heating function and the circulating fan system that drives the atmosphere circulation in the furnace together inside the hearth defined by the furnace body. When working, the circulating fan arranged at the top of the hearth drives the atmosphere in the furnace to flow, the atmosphere passes through the heating elements arranged in the air duct to be heated, forming a high-temperature gas flow, and then the high-temperature gas flow passes through and surrounds the aluminum foil roll carried on the material car to heat, insulate and cool the aluminum foil roll through the convective heat exchange.

[0004] However, the above-mentioned internal design has inherent defects that are difficult to overcome. First, the heating elements and the circulating fan system, including the fan motor, bearings and impellers and other key components, are completely exposed to the high-temperature atmosphere in the hearth for a long time, even with a certain corrosive atmosphere. The harsh working environment can accelerate the aging, oxidation and damage of these components, significantly shorten their service life, and increase the risk of equipment failure. Second, once these internal key components fail and need to be repaired or replaced, the disassembly and maintenance process is complex and the repair cost is high.

[0005] In order to solve the maintenance difficulty and short service life of the components of the above-mentioned internal scheme, the heating and circulating system can be completely externalized. The circulating fan and heating device are all moved to the outside of the furnace body to form an independent external hot air unit. This external design solves the maintenance problem, but still causes new problems.

[0006] First, the energy efficiency drops sharply. The high-temperature atmosphere needs to be transported over a long distance in a large and complex external pipeline system, and the pipeline itself is a huge heat sink, resulting in serious heat loss and energy waste.

[0007] Second, the process performance is difficult to guarantee. The high-temperature gas flow is injected into the furnace through the concentrated pipeline port, forming a strong local thermal shock, which is easy to cause serious temperature unevenness in the furnace, and is difficult to meet the precise temperature control requirements required for high-quality aluminum foil annealing.

[0008] In summary, the existing aluminum foil annealing furnace technical scheme is in a dilemma: the traditional built-in design has good thermal performance, but poor maintainability and long downtime; while the external design improves the maintenance convenience, but at the cost of energy efficiency, process uniformity and system simplicity, and the comprehensive benefits are not good. Therefore, there is a lack of an aluminum foil annealing furnace that can balance high thermal performance and high maintenance convenience in the market. SUMMARY

[0009] The purpose of the present application is to provide a modular aluminum foil annealing furnace, which aims to solve the problem that the maintenance convenience and thermal performance of the existing annealing furnace are difficult to achieve both, and can realize convenient external maintenance while having the advantages of high energy efficiency and high precision furnace temperature uniformity.

[0010] The above technical purpose of the present application is achieved by the following technical scheme:

[0011] A modular aluminum foil annealing furnace, comprising:

[0012] A modular furnace body, a heat conduction layer is provided on the inner wall of the furnace body, and heat conduction rods are further provided on the heat conduction layers of the top wall and side wall of the furnace body;

[0013] A furnace door is provided on the furnace body for opening or closing the furnace body;

[0014] A wind source and a heating device are modularly installed on the top of the furnace body and are located on the outside of the furnace body, and the heating device heats the airflow from the wind source;

[0015] The furnace body is further provided with an air inlet air duct, a blowing air duct and a return air duct which are in communication with each other, and the air inlet air duct, blowing air duct and return air duct are in contact with the heat conduction layer;

[0016] The air inlet air duct is provided on the side wall and top wall of the furnace body and is in communication with the heating device for receiving heated airflow;

[0017] The blowing air duct is provided on the bottom wall of the furnace body, and a blowing port for blowing air into the internal space of the furnace body is provided thereon;

[0018] The return air duct is provided on the top wall of the furnace body, and a return air port for recovering the airflow in the internal space of the furnace body is provided thereon, and the return air duct is in communication with the wind source to form a circulating air path.

[0019] Further provided: the air inlet air duct comprises:

[0020] A first air duct is provided on the top wall of the furnace body, and the first air duct is arranged in a staggered manner with the return air duct;

[0021] a second air duct arranged on the side wall of the furnace body, the second air duct being arranged in an inclined manner;

[0022] and a third air duct arranged on the side wall of the furnace body and close to the bottom of the furnace body, the third air duct being arranged in a horizontal manner;

[0023] wherein the first air duct is in communication with the heat supply device, the first air duct, the second air duct and the third air duct are in communication in sequence, and the third air duct is in communication with the air blowing duct.

[0024] Further provided is that the heat supply device further comprises:

[0025] a make-up air duct connected between the return air duct and the air source;

[0026] a make-up air outlet and an electric control valve arranged on the make-up air duct, for introducing external air flow into the make-up air duct.

[0027] Further provided is that the heat supply device comprises:

[0028] an outer shell;

[0029] an inner container arranged in the outer shell, the inner container being in communication with the air source and the air inlet duct, and a heat insulation space being formed between the inner container and the outer shell;

[0030] a heat source arranged on the outer shell;

[0031] a heat-conducting fin cage arranged in the inner container, the heat-conducting fin cage being connected with the heat source, and air flow from the air source being heated when flowing through the heat-conducting fin cage in the inner container.

[0032] Further provided is that the heat source and the heat-conducting fin cage are integrally connected.

[0033] Further provided is that the heat-conducting fin cage comprises a central shaft integrally connected with the heat source, and the heat-conducting fin cage is rotationally connected to the outer periphery of the central shaft.

[0034] Further provided is that the heat-conducting fin cage comprises:

[0035] a plurality of fins arranged in a stacked manner along the height direction, each fin being in a spiral shape;

[0036] a plurality of radial extension portions arranged on each fin;

[0037] a fin ring surrounding the outer circle of each layer of fins; wherein a gap channel for guiding air flow is formed between adjacent extension portions and fin rings, for making the air flow in a turbulent state.

[0038] Further provided is that the heat supply device further comprises:

[0039] A lifting mechanism for driving the oven door to vertically lift;

[0040] A closing mechanism for horizontally moving the oven door descending to the closed position to compress the seal.

[0041] Further provided is that the lifting mechanism comprises:

[0042] A power source arranged above the oven body, the power source comprising a rotating device and an output shaft driven by the rotating device, and a chain transmission mechanism arranged between the output shaft and the oven door;

[0043] Guide rails arranged on both sides of the oven body;

[0044] And rolling members arranged on the oven door and in rolling contact with the guide rails to lift along the direction of the guide rails under the driving of the power source; wherein the rolling members and the guide rails are gap-fitted to allow the oven door to have a space for lateral movement when descending to the closed position.

[0045] Further provided is that the closing mechanism comprises:

[0046] A transverse sliding rail arranged on the oven body, the transverse sliding rail being provided with a sliding groove;

[0047] A guide sliding rail arranged between the oven door and the oven body, the guide sliding rail being provided with a sliding block capable of sliding on the sliding groove;

[0048] A linear reciprocating device, an output end of the linear reciprocating device being connected with the guide sliding rail to drive the guide sliding rail to horizontally reciprocate along the direction of the transverse sliding rail;

[0049] The oven door is provided with a guide block that cooperates with the guide sliding rail to slide; so that the oven door is lifted along the direction of the guide sliding rail under the driving of the power source.

[0050] In summary, the present application has the following beneficial effects:

[0051] Firstly, in the present application, the blowing air duct is arranged on the bottom wall of the oven body, and the return air duct is arranged on the top wall of the oven body, so that an orderly whole vertical air flow field is formed inside the oven body from bottom to top and throughout the whole effective working space. This circulation mode forces the hot air to flow through the bottom of the trolley carrying the aluminum foil roll first, and then uniformly flow over the entire outer surface of the aluminum foil roll from bottom to top, thereby effectively avoiding the air flow short circuit or the heat stagnation area at the bottom of the oven that may occur in the traditional circulation mode. This structure ensures that heat can fully penetrate and uniformly transfer to all parts of the workpiece, significantly improving the temperature uniformity inside and outside the roll, and up and down.

[0052] And, by placing the air source and heating device outside the top of the furnace body, and guiding the heated high-temperature airflow into the air inlet air duct arranged in the top wall and side wall of the furnace body, the heat of the airflow is first transferred to the large-area heat-conducting layer and heat-conducting rod, and then the inner wall of the furnace body is converted into a uniform planar heat source. This design changes the point and impact heat source of the traditional external hot blast stove into a large-area, low-wind-speed radiation and convection combined heat source, solving the problem of uneven furnace temperature and local overheating caused by external heat sources, thereby achieving rapid and convenient maintenance of components while achieving high-precision furnace temperature uniformity comparable to the internal solution. Since the high-temperature airflow channels such as the air inlet air duct, the air blowing air duct and the return air duct are arranged on the inner wall of the furnace body and are in close contact with the heat-conducting layer, a heat recovery system is formed. In the traditional external solution, the main heat loss is the heat loss during the conveying process of the pipeline, which is absorbed by the heat-conducting layer of the furnace body in this solution and is retransferred into the furnace. This effectively reduces the heat transfer loss and significantly improves the overall thermal efficiency of the system, overcoming the inherent defect of high energy consumption of the external solution.

[0053] Secondly, in the present application, the furnace body is modularized and assembled, and by designing the furnace body, air source and heating device as independent standardized modules, each functional unit can complete pre-precision machining, assembly and testing in the manufacturing factory. Compared with the traditional on-site construction, this off-line manufacturing mode greatly improves the manufacturing precision and quality stability of the equipment. More importantly, it changes the nature of the work at the end user site from long-cycle, complex environment welding and construction to short-cycle, clear process standardized assembly. As a result, not only is the overall cycle from equipment delivery to production significantly shortened, but the cost, difficulty and safety risk of on-site installation are also greatly reduced. At the same time, users can configure modules according to initial production requirements to complete technical upgrades.

[0054] Thirdly, in the present application, by designing the air inlet air duct as a first air duct located on the top wall of the furnace body, a second air duct obliquely arranged on the side wall, and a third air duct horizontally arranged at the bottom of the side wall, a preheating flow path with maximum heat exchange travel is constructed. This structure forces the airflow carrying the highest heat energy to travel along this specific path before entering the furnace body, thereby greatly extending the contact time and contact area of the high-temperature airflow with the heat-conducting layer of the top wall and side wall of the furnace body. The heat energy of the airflow is more fully and uniformly transferred to the heat-conducting layer, strengthening the uniformity and heat capacity of the planar heat source of the inner wall of the furnace body, providing a physical basis for achieving high-precision furnace temperature uniformity.

[0055] Fourthly, by adding the air supplement duct precisely controlled by the electric control valve, the cooling stage in the annealing process is changed from the traditional, slow and uncontrollable natural cooling to an actively intervened and rate precisely adjustable forced air cooling process. By quantitatively mixing the external low-temperature air flow into the circulating loop according to the preset program during the cooling stage, the cooling rate of the atmosphere in the furnace can be significantly improved, thereby greatly shortening the cycle length of the entire annealing process. Moreover, the air supplement duct is equivalent to a high-efficiency gas mixer. The externally introduced low-temperature air flow is pre-mixed with the high-temperature return air from the furnace body here, ensuring that the temperature of the air flow entering the subsequent heating device is relatively uniform. The risk of low-temperature air flow directly impacting and quenching high-temperature heat source components without mixing is avoided, effectively preventing material fatigue or damage of the heat source due to severe thermal shock, and ensuring the long-term operation reliability of the core components.

[0056] Fifthly, in the present application, by designing the heating device as a double-layer insulation structure and placing the heat-conducting fin cage in the inner liner as the main air flow channel, while ensuring efficient heating of the air flow, the heat dissipation to the external environment is minimized by utilizing the insulation space between the inner liner and the outer shell. The problem of low energy efficiency caused by heat dissipation of external pipelines in traditional external hot air units is effectively solved, and the heat utilization rate of the entire external system is significantly improved.

[0057] Sixthly, in the present application, the heat source and the heat-conducting fin cage have multiple structures. Firstly, by integrating the heat source and the heat-conducting fin cage, heat can be transferred from the heat source to every part of the heat-conducting fin cage without obstacles in the most efficient solid-state heat conduction mode. This ensures the instantaneousness and minimization of heat energy transfer, allowing the surface of the heat-conducting fin cage to quickly reach and maintain a higher effective heat exchange temperature, thereby significantly improving the total heat transfer capacity and response speed of the entire heating device under the same heat source power.

[0058] Secondly, by designing the central shaft integrated with the heat source as a stationary component and connecting the heat-conducting fin cage as a rotatable component to the outer periphery, this scheme effectively separates static heat conduction and dynamic convective heat transfer in structure. This allows the heat-conducting fin cage to stably import heat from the central shaft while forcibly destroying and removing the low-temperature air boundary layer attached to the fin surface through its high-speed rotation. This enhances the convective heat transfer coefficient between the fin surface and the main air flow, increases the static heat transfer to dynamic strong turbulent heat transfer, thereby doubling the overall heating efficiency and maximum heating power of the heating device.

[0059] Thirdly, by including multiple layers of fins and external fin rings in the internal structure of the heat-conducting fin cage, a large heat exchange surface area is constructed in a limited volume. The gap channels defined by adjacent fins and fin rings themselves constitute a static turbulence generator. When the airflow is forced to pass through these non-linear, converging-diverging channels, strong vortexes and disturbances are naturally generated, thus achieving sufficient mixing and efficient heat exchange of the airflow at the micro level before macro rotation occurs, further enhancing the overall heat transfer performance of the device.

[0060] Fourthly, by arranging each fin in a spiral shape, a stable rotating component is induced in the main flow field and a continuous vortex flow is formed through the static guiding effect of the spiral surface on the airflow without rotating the heat-conducting fin cage. The vortex flow actively disturbs and thins the air boundary layer attached to the surface of the fin, improving the convective heat transfer coefficient and enhancing the heat transfer efficiency under static conditions. In the case of rotating the heat-conducting fin cage, through the combined effect of the rotation of the heat-conducting fin cage itself and the spiral shape of the fin, a circumferential mechanical shear force and an axial spiral guiding force are exerted on the airflow. The superposition of the two forces forms a three-dimensional composite turbulent flow field, thereby destroying the thermal boundary layer, increasing the heat transfer efficiency, and increasing the heating rate.

[0061] Seventhly, in the present application, the opening and closing of the furnace door are decomposed into two independent mechanical actions of vertical lifting and horizontal movement, and are respectively executed by dedicated lifting mechanisms and closing mechanisms. This separates the large stroke, fast movement function required to overcome the gravity of the furnace door, from the large thrust, short stroke compression function required to achieve the sealing of the furnace opening. This avoids the problems of complex structure, long transmission chain and reduced reliability caused by a single mechanism trying to meet the two greatly different movement requirements. Ultimately, a more stable and reliable structure is achieved.

[0062] Among them, by pre-setting a gap that allows lateral movement between the guide rail of the lifting mechanism and the rolling member, the vertical guiding system is given a dual function. During the lifting process, the system provides stable and reliable vertical motion guidance; when the furnace door is lowered to the closed position, the pre-set gap becomes the necessary mechanical space for the horizontal movement of the closing mechanism.

[0063] By using a linear reciprocating device to drive a movable intermediate guide rail, and then using the guide rail to push the furnace door to complete the horizontal sealing of the two-stage flat push structure, the centralized point force provided by the linear reciprocating device is effectively converted into a more uniform linear distributed force applied to the furnace door. This ensures that the heavy furnace door can maintain a stable posture during horizontal movement without deflection or jamming. Not only does this improve the smoothness and reliability of the closing action, but more importantly, it ensures that the contact pressure around the sealing ring of the furnace door is uniform when it is finally compressed, thereby achieving a more reliable and durable sealing effect. BRIEF DESCRIPTION OF DRAWINGS

[0064] Figure 1 is a perspective view of a modular aluminum foil annealing furnace;

[0065] Figure 2 is a side view of a modular aluminum foil annealing furnace;

[0066] Figure 3 is a top view of a modular aluminum foil annealing furnace;

[0067] Figure 4 is Figure 3 A-A sectional view in

[0068] Figure 5 is Figure 3 B-B sectional view in

[0069] Figure 6 is Figure 3 C-C sectional view in

[0070] Figure 7 is a partial internal structure schematic view of a heating device;

[0071] Figure 8 is Figure 3 D-D sectional view in

[0072] In the figure, 100, furnace body; 101, hoisting support part; 102, material track; 103, air inlet duct; 104, air blowing duct; 105, air blowing port; 106, air return port; 107, air return duct; 108, first air duct; 109, second air duct; 110, third air duct; 111, heat conduction rod; 112, sealing ring; 113, heat conduction layer;

[0073] 200, furnace door;

[0074] 300, lifting mechanism; 303, guide rail; 304, rolling member;

[0075] 310, power source; 311, rotating device; 312, output shaft; 313, first sprocket; 314, second sprocket; 315, third sprocket; 316, fourth sprocket;

[0076] 400, closing mechanism; 401, transverse sliding rail; 402, sliding groove; 403, sliding block; 404, linear reciprocating device; 405, guide sliding rail; 406, guide block;

[0077] 500, air source; 501, volute; 502, air wheel; 503, rotary device; 504, air supplementing duct; 505, air supplementing port; 506, electric control valve;

[0078] 600. Heating device; 601. Outer shell; 602. Inner liner; 603. Heat source; 604. Heat-conducting fin cage; 605. Central shaft; 606. Fin; 607. Fin ring; 608. Extension; 609. Gap channel. Detailed Implementation

[0079] The present invention will be further described in detail below with reference to the accompanying drawings.

[0080] 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.

[0081] A modular aluminum foil annealing furnace, such as Figure 1 and Figure 2 As shown, the furnace includes a modular furnace body 100. The furnace body 100 is assembled from multiple modules. The front end of the furnace body 100 is provided with a furnace door 200 for loading and unloading materials. The furnace door 200 is movably connected to the furnace body 100 and can provide an airtight seal for the furnace opening when closed.

[0082] On top of the furnace body 100, a modular air source 500 and a heating device 600 are installed. The air source 500, for example, is a high-pressure centrifugal fan, which provides continuous power for the circulation of gas within the furnace. The heating device 600, for example, is an electric heater, located adjacent to the outlet of the air source 500, for heating the circulating airflow from the air source 500.

[0083] like Figure 3 and Figure 4 As shown, in this embodiment, the air source 500 includes a volute 501 that serves as a fixed outer cover, a wind turbine 502 disposed inside the volute 501, and a rotary device 503 for driving the wind turbine 502 to rotate.

[0084] Specifically, the volute 501 is an involute shell shaped like a snail shell, extending along an Archimedean spiral. A central air inlet for drawing in gas is located at the center of its side wall, while an exhaust port for connecting to the heating device 600 is located on its tangential outer edge. The function of the volute 501 is to effectively collect the high-speed gas ejected by the impeller 502, convert its kinetic energy into pressure energy, and then stably deliver it out.

[0085] The impeller 502 is located at the center of the cavity enclosed by the volute 501. The slewing device 503 provides power for the rotation of the impeller 502. In a specific example, the slewing device 503 may include an electric motor mounted outside the volute 501, with the motor shaft connected to the impeller 502.

[0086] During operation, the rotary device 503 drives the impeller 502 to rotate at high speed within the volute 501. Gas from the return air duct 107 is axially drawn in through the central air inlet of the volute 501 and then enters the space between the high-speed rotating impeller 502. Under the action of centrifugal force, the gas is accelerated and thrown out radially outward along the impeller 502, finally collecting within the volute 501 and being guided to the exhaust port for discharge along the spiral channel of the volute 501. To achieve precise control of the circulating air volume within the furnace, the motor in the rotary device 503 can also be speed-regulated via a frequency converter.

[0087] The inner surfaces of the top and side walls of the furnace body 100 are covered with a heat-conducting layer 113. This heat-conducting layer 113 can be a metal plate with good thermal conductivity, such as stainless steel or a heat spreader plate, or it can be a high-temperature resistant ceramic material, such as silicon carbide. To further enhance the transfer and distribution of heat on the furnace wall, multiple heat-conducting rods 111 are fixed on the surface of the heat-conducting layer 113 on the top and side walls, and the multiple heat-conducting rods 111 are evenly arranged at equal intervals.

[0088] like Figure 3 , Figure 4 and Figure 5 as well as Figure 7 As shown, in order to construct an efficient heat transfer and gas circulation path, an interconnected air duct system is integrated inside the furnace body 100. This air duct system includes an inlet air duct 103, a blower air duct 104, and a return air duct 107. All three maintain a large contact area with the heat-conducting layer 113 on the inner wall of the furnace body 100 to achieve sufficient heat exchange between the airflow and the furnace wall.

[0089] Specifically, the entire circulating air path begins at the external heating device 600. The high-temperature airflow, heated by the heating device 600, is first introduced into the air inlet ducts 103 located within the top and side walls of the furnace body 100. The airflow flows laterally within the air inlet ducts 103 on the top wall, then turns and enters the air inlet ducts 103 that slope downwards along the side walls, finally converging into the blowing ducts 104 at the bottom of the furnace body 100. During this process, the heat from the high-temperature airflow is efficiently transferred to the heat-conducting layer 113 and heat-conducting rods 111 in contact with it, thereby preheating the entire top and side walls of the furnace body 100 into a uniform planar radiant heat source.

[0090] After the initial heat exchange, the air flow is collected and equalized in the blowing air duct 104 located in the bottom wall of the furnace body 100, and then blown into the internal working space of the furnace body 100 from the bottom to the top through the uniformly distributed blowing ports 105, thereby gently and uniformly heating the aluminum foil roll placed on the trolley. After completing the heating of the workpiece, the air flow rises to the top of the furnace body 100 and is collected into the return air duct 107 through the return air port 106 provided in the top wall. Finally, the return air duct 107 guides the collected atmosphere back to the inlet of the air source 500 outside the furnace body 100, thereby completing the entire closed circulation heating loop.

[0091] In a preferred embodiment, in order to achieve efficient and uniform preheating of the wall surface of the furnace body 100, the air inlet duct 103 is a multi-section structure with a specific path. The air inlet duct 103 includes a first air duct 108, a second air duct 109, and a third air duct 110.

[0092] Specifically, the high-temperature air flow from the heating device 600 at the top of the furnace body 100 first enters the first air duct 108 transversely arranged in the top wall of the furnace body 100. The inlet of the first air duct 108 is usually located on one side of the top wall, and the inlet of the return air duct 107 is located on the opposite side, which are arranged staggered, forcing the high-temperature air flow to cross the entire furnace top, while fully heating the top heat-conducting layer 113 and avoiding short circuiting between the inlet and return air flows from a fluid mechanics perspective.

[0093] The end of the first air duct 108 is smoothly connected to the second air duct 109 extending downward along the side wall of the furnace body 100 at the upper corner of the furnace body 100. The second air duct 109 is not vertically downward, but is arranged at a predetermined inclination angle. Without increasing the wall thickness of the furnace body 100, the travel distance of the air flow inside the side wall is extended, thereby increasing the contact time and heat exchange area of the air flow with the heat-conducting layer 113 of the side wall, so that the heat energy is more fully transferred to the side wall.

[0094] The bottom of the second air duct 109, near the bottom wall of the furnace body 100, is connected to a transversely arranged third air duct 110. The third air duct 110 functions similarly to an equalizing gas collection tank, which regulates and buffers the air flow flowing down from the inclined second air duct 109 and uniformly distributes it into the blowing air duct 104 in the bottom wall of the furnace body 100.

[0095] Through the above-mentioned first air duct 108, second air duct 109, and third air duct 110 connected in sequence, the high-temperature air flow can orderly and efficiently pre-transfer part of the heat it carries to the top wall and side wall of the furnace body 100 before entering the working space of the furnace body 100, thereby providing a solid physical basis for forming a uniform planar heat source.

[0096] This embodiment also includes a makeup air duct 504. One end of the makeup air duct 504 is connected to the main circulation path outside the furnace, specifically located between the return air duct 107 and the inlet of the air source 500. The other end of the makeup air duct 504 leads to the external environment or a dedicated gas supply source, and a makeup air inlet 505 is provided at this end. An electrically controlled valve 506, such as a fast-response, high-precision electric butterfly valve or ball valve, is installed on the makeup air duct 504. This electrically controlled valve 506 is connected to the central control system of the annealing furnace.

[0097] During the cooling stage of the annealing process, when accelerated cooling within the furnace is required, the central control system can precisely control the opening angle and duration of the electrically controlled valve 506 according to a preset cooling process curve. External low-temperature airflow, such as clean air or nitrogen as a protective gas, is drawn into the make-up air duct 504 through the make-up air inlet 505 and merges into the high-temperature return airflow extracted from the furnace body 100. The two airflows are fully mixed before entering the air source 500, forming a cooled mixed airflow, which is then sent by the air source 500 to the subsequent circulation loop, thereby achieving rapid and controllable cooling of the gas inside the furnace.

[0098] like Figure 5 and Figure 7 As shown, in this embodiment, the heating device 600 is an independent, high-efficiency indirect heating module. The heating device 600 includes an outer shell 601 and an inner liner 602 coaxially disposed inside the outer shell 601. The inner liner 602 serves as the main channel for circulating airflow, with its inlet connected to the outlet of the air source 500 and its outlet connected to the air inlet duct 103 on the furnace body 100. The annular cavity formed between the inner liner 602 and the outer shell 601 constitutes a heat-insulating space, which can be filled with high-performance heat-insulating materials such as ceramic fibers to prevent heat loss to the outside.

[0099] In this embodiment, the heat source 603 is a set of high-power resistance heating elements.

[0100] A heat-conducting fin cage 604 is provided inside the inner liner 602. The heat-conducting fin cage 604 is a component with a large heat exchange surface area, and its structure can be integrally cast or welded from a high thermal conductivity metal, such as a heat-resistant alloy.

[0101] During operation, the enormous heat generated by the heat source 603 is transferred to the heat-conducting fin cage 604 inside the inner liner 602 via solid-state heat conduction. Meanwhile, the circulating airflow from the air source 500 flows at high speed through the channels of the inner liner 602 and penetrates the spatial structure of the heat-conducting fin cage 604, where it is rapidly heated by forced convection before being sent into the furnace body 100.

[0102] In one specific embodiment, in order to achieve the most efficient heat transfer between the heat source 603 and the heat-conducting fin cage 604, the two can be connected in an integrated structure. For example, by integral casting, or by high-temperature brazing, diffusion welding, or other metallurgical connection methods, the heat-generating part of the heat source 603 and the heat dissipation structure of the heat-conducting fin cage 604 are tightly combined into a single whole without interface thermal resistance. Ensuring that heat can be rapidly and uniformly distributed to the entire heat exchange surface of the heat-conducting fin cage 604 in the form of the most efficient solid-state heat conduction from the heat-generating point.

[0103] In another embodiment aimed at actively enhancing heat exchange, the structure inside the heat supply device 600 is designed as two parts of static and dynamic. Specifically, it includes a fixed central shaft 605, which is integrally connected with the heat source 603 to form a stationary core that stably introduces heat. The heat-conducting fin cage 604 is then connected as an independent ring-shaped component to the outer periphery of the stationary central shaft 605 through rotating mechanisms such as high-temperature bearings, allowing the heat-conducting fin cage 604 to rotate while stably receiving heat from the central shaft 605. This enables the heat-conducting fin cage 604 to strongly disturb the airflow passing through it by rotating, thereby doubling the heat exchange efficiency.

[0104] In one specific embodiment, in order to increase the heat exchange area and enhance the disturbance effect, the heat-conducting fin cage 604 includes several fin plates 606 stacked vertically along its height direction. Each fin plate 606 can be a central substrate with a through hole, and several extension parts 608 are integrally provided on the substrate and extend radially outward.

[0105] At the outermost periphery of each fin plate 606, there is an independent fin ring 607 with a height comparable to the thickness of the fin plate 606 and the extension part 608, tightly enclosing the outer ends of all extension parts 608. In this way, within the same fin plate 606, the gap channel 609 for guiding airflow is defined between the inner wall of the fin ring 607 and the two adjacent extension parts 608.

[0106] When the airflow flows along the height direction through the gap channel 609 constructed by multiple fin plates 606 and fin rings 607, its flow path is forced to change constantly between the gap channels 609 at different levels and different radial positions. This structure forcibly puts the smooth airflow into a highly disturbed state, greatly enhancing the heat exchange between the airflow and the surfaces of the fin plates 606 and the extension parts 608 on a macroscopic scale, achieving high-efficiency heat exchange.

[0107] In the present embodiment, each fin 606 is not a traditional flat disc, but rather a continuous helical surface with a predetermined pitch. In a basic design, the helical fin has a constant pitch, i.e. the helical surface has a uniform pitch in the entire height direction.

[0108] As an alternative embodiment, the geometric parameters of the helical fin can also be designed in a gradient manner to achieve precise control of the internal flow field.

[0109] For example, a variable-pitch helical fin is used. Specifically, at the air inlet end of the heating device 600, the pitch of the helical fin is small, forming a steep helical channel; along the air flow direction, the pitch gradually increases, making the helical channel tend to be flat in the middle and rear sections.

[0110] For another example, a variable-width helical fin is used. In this design, the radial width of the fin 606 changes along the axial direction. A specific configuration is that the radial width of the fin 606 is maximum at the air inlet end and gradually narrows along the air flow direction, so that the entire heat-conducting fin cage 604 appears conical or stepped conical in appearance.

[0111] For another example, a variable-thickness helical fin is used. In this design, the cross-sectional thickness of the fin 606 itself varies. One way is that the fin 606 is thickest near the central root and gradually thins out radially outward. Another way is that the overall thickness of the fin 606 is larger at the air inlet end and gradually thins out axially towards the outlet direction.

[0112] As shown in Figure 1 , Figure 2 and Figure 8 , in a preferred embodiment, the opening and closing actions of the furnace door 200 are completed by a two-stage driving system, which includes a lifting mechanism 300 and a closing mechanism 400. The lifting mechanism 300 is responsible for driving the furnace door 200 to perform large-stroke lifting movement in the vertical direction to completely open or close the inlet and outlet of the furnace body 100; and the closing mechanism 400 drives the furnace door 200 to perform a short-stroke horizontal movement after the lifting mechanism 300 operates the furnace door 200 to the closed position, to realize the final compression sealing between the furnace door 200 and the furnace body 100. The two mechanisms function independently and the action timing is connected, which together ensures that the furnace door 200 can be quickly opened and reliably sealed.

[0113] Specifically, the structure of the lifting mechanism 300 includes guide rails 303 as the vertical movement reference and rolling members 304 cooperating with the guide rails 303. The guide rails 303, for example, two high-strength heavy rails, are fixedly installed on both sides of the inlet and outlet of the furnace body 100. A plurality of rolling members 304, for example, rollers, are arranged on both sides of the furnace door 200 and accommodated in the track slots of the guide rails 303 to form rolling contact with the guide rails 303, so as to ensure the smoothness and stability of the furnace door 200 during lifting.

[0114] The power source of the lifting mechanism 300 is a power source 310 arranged above the furnace body 100 and an output shaft 312 driven thereby, for example, a power assembly composed of a motor and a speed reducer. A chain transmission mechanism is arranged on the output shaft 312 of the power source 310, for example, a first sprocket 313 is arranged at both ends of the output shaft 312, a second sprocket 314 and a fourth sprocket 316 are arranged on the top of the furnace body 100, and a third sprocket 315 is arranged on the bottom of the furnace body 100. The first sprocket 313, the second sprocket 314, the third sprocket 315, and the fourth sprocket 316 are connected by a chain transmission, and the fourth sprocket 316 is close to the second sprocket to provide a bending transition. When the power source 310 is started, the output shaft 312 rotates, and the furnace door 200 is pulled by the chain transmission mechanism, so that the furnace door 200 is stably lifted vertically under the guidance of the rolling members 304 and the guide rails 303.

[0115] Among them, the rolling members 304 and the guide rails 303 of the lifting mechanism 300 are not tightly fitted, but adopt a clearance fit. The clearance leaves a space for the furnace door 200 to move slightly in the horizontal direction without affecting the vertical guiding function. This horizontal movement space is a necessary prerequisite for the subsequent closing mechanism 400 to smoothly perform the horizontal pressing action, which reflects the linkage and connection of the two mechanisms in design.

[0116] After the lifting mechanism 300 lowers the furnace door 200 to the closed position, a separate closing mechanism 400 is used to perform the final horizontal pressing and sealing action. The closing mechanism 400 adopts a two-stage flat pushing structure to ensure the smoothness and accuracy of the furnace door 200 during horizontal movement.

[0117] Specifically, the closing mechanism 400 includes a horizontal movement sliding rail 401 as a fixed reference and a movable guide sliding rail 405. The horizontal movement sliding rail 401 is horizontally fixedly installed on the furnace body 100, and a sliding groove 402 for guiding is formed on the horizontal movement sliding rail 401. The guide sliding rail 405 is located between the furnace door 200 and the furnace body 100, and a sliding block 403 capable of slidingly cooperating with the sliding groove 402 of the horizontal movement sliding rail 401 is arranged on the guide sliding rail 405, so that the guide sliding rail 405 can stably move horizontally along the track defined by the horizontal movement sliding rail 401.

[0118] The side wall of the furnace door 200 is provided with a guide block 406 which is in sliding cooperation with the guide slide rail 405. The power source of the closing mechanism 400 is a linear reciprocating device 404, such as a cylinder with large thrust, an oil cylinder or an electric cylinder. The linear reciprocating device 404 is installed on one side of the furnace body 100, and the output end thereof is connected with the movable guide slide rail 405.

[0119] When the furnace door 200 needs to be tightly sealed, the linear reciprocating device 404 is started, and the output end thereof pushes the guide slide rail 405. The guide slide rail 405 is then moved stably along the fixed transverse slide rail 401 to the direction of the furnace body 100. In this process, the movable guide slide rail 405 drives the furnace door 200 to horizontally push the entire furnace door 200, and finally makes the sealing ring 112 on the furnace door 200 tightly press the furnace body 100 by using the transverse movement space reserved between the guide rail 303 and the rolling member 304 of the lifting mechanism 300, so as to complete the airtight closing.

[0120] In order to facilitate the lifting operation of the modular furnace body 100 during transportation and on-site installation, a lifting support part 101 is integrally formed or welded at the top long side or the top corner of the furnace body 100. The lifting support part 101, for example, can be a lifting lug or a force-bearing lifting ring with reinforcing ribs, and the structural strength thereof is sufficient to support the weight of a single furnace body 100 module or the entire furnace body 100.

[0121] The material track 102 for carrying and guiding the material car is also laid on the upper side of the blowing air duct 104 of the bottom wall in the working space inside the furnace body 100. The material track 102 generally includes two tracks made of high-temperature-resistant heavy steel and arranged in parallel along the depth direction of the furnace body 100, and the laying direction thereof is consistent with the opening direction of the furnace door 200, extending from the deep part of the furnace body 100 to the furnace mouth position. When loading is needed, the material car carrying the aluminum foil roll can be stably pushed into the furnace along the material track 102; after annealing is completed, it can be smoothly pulled out along the material track 102, realizing the convenience and efficiency of the loading and unloading process.

[0122] The above embodiments are only explanations of the present application, and are not limitations of the present application. Those skilled in the art can make modifications to the embodiments without creative contribution after reading the specification, as long as the modifications are within the scope of the claims of the present application, and are protected by the patent law.

Claims

1. A modular aluminum foil annealing furnace characterized by, The application relates to a modular stove body, a stove door, a wind source and a heating device. The stove body is provided with a heat-conducting layer on the inner wall, and the heat-conducting layer on the top wall and the side wall of the stove body is further provided with a heat-conducting rod. The stove door is arranged on the stove body and used for opening or closing the stove body. The wind source and the heating device are modularly arranged on the top of the stove body and located outside the stove body, and the heating device heats the airflow from the wind source. The stove body is further provided with an air inlet air duct, an air blowing air duct and an air return air duct which are in communication with each other and in contact with the heat-conducting layer. The air inlet air duct is arranged on the side wall and the top wall of the stove body and is in communication with the heating device and used for receiving the heated airflow. The air blowing air duct is arranged on the bottom wall of the stove body and is provided with an air blowing port for blowing air into the internal space of the stove body. The air return air duct is arranged on the top wall of the stove body and is provided with an air return port for recycling the airflow in the internal space of the stove body, and the air return air duct is in communication with the wind source to form a circulating air path. The air inlet air duct comprises a first air duct arranged on the top wall of the stove body and arranged in a staggered mode with the air return air duct, a second air duct arranged on the side wall of the stove body and arranged in an inclined mode, and a third air duct arranged on the side wall of the stove body and close to the bottom of the stove body and arranged in a horizontal mode. The first air duct is in communication with the heating device, the first air duct, the second air duct and the third air duct are sequentially in communication, and the third air duct is in communication with the air blowing air duct. The heating device comprises an outer shell, an inner container arranged in the outer shell, a heat source arranged on the outer shell, and a heat-conducting fin cage arranged in the inner container. The heat-conducting fin cage is connected with the heat source, and the airflow from the wind source is heated when flowing through the heat-conducting fin cage in the inner container. The heat-conducting fin cage comprises a plurality of fins arranged in a stacked mode along the height direction and each fin arranged in a spiral mode. Each fin is provided with a plurality of radial extending parts. A fin ring is arranged around the outer circle of each layer of fins. The adjacent extending parts and the fin ring form a gap channel for guiding the airflow to flow in a turbulent state. The application further comprises a supplementary air duct connected between the air return air duct and the wind source, a supplementary air port arranged on the supplementary air duct and an electric control valve used for introducing external airflow into the supplementary air duct. The heat source is integrally connected with the heat-conducting fin cage. The heat-conducting fin cage comprises a central shaft integrally connected with the heat source, and the heat-conducting fin cage is rotationally connected to the outer periphery of the central shaft. The application further comprises a lifting mechanism used for vertically lifting the stove door and a closing mechanism used for horizontally moving the stove door to the closed position to press and seal. The lifting mechanism comprises a power source arranged above the stove body, the power source comprising a rotating device and an output shaft driven by the rotating device, a chain transmission mechanism arranged between the output shaft and the stove door, guide rails arranged on both sides of the stove body, and a lifting chain arranged between the chain transmission mechanism and the guide rails. ​ 2. The modular aluminum foil annealing oven of claim 1, wherein: ​ ​ ​ 3. The modular aluminum foil annealing oven of claim 1, wherein: ​ 4. The modular aluminum foil annealing oven of claim 1, wherein: ​ 5. The modular aluminum foil annealing oven of claim 1, wherein: ​ ​ ​ 6. The modular aluminum foil annealing oven of claim 5, wherein: ​ ​ ​ and a rolling member arranged on the door and in rolling contact with the guide rail to be driven by the power source to move along the guide rail; wherein the rolling member and the guide rail are in clearance fit to allow lateral movement of the door when the door is lowered to the closed position.

7. The modular aluminum foil annealing oven of claim 6, wherein: The closing mechanism comprises: a horizontal sliding rail arranged on the oven body and provided with a sliding groove; a guide rail arranged between the door and the oven body and provided with a sliding block capable of sliding on the sliding groove; a linear reciprocating device, an output end of the linear reciprocating device being connected with the guide rail to drive the guide rail to move horizontally along the horizontal sliding rail; the door is provided with a guide block capable of sliding with the guide rail to be driven by the power source to move along the guide rail.

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