Modularized aluminum foil annealing furnace

Abstract

The invention discloses a modular aluminum foil annealing furnace, which relates to the field of heat treatment equipment, and is characterized in that an air source and a heat supply device are externally arranged at the top of a furnace body; a heat-conducting layer and heat-conducting rods are arranged on the inner wall of the furnace body; the heated high-temperature airflow is conveyed through an air inlet duct which is arranged in the top wall and the side wall of the furnace body and is in contact with the heat conduction layer, so that the inner wall of the whole furnace body is preheated into a large-area and uniform planar heat source; and the air is fed into the furnace from bottom to top through an air blowing duct arranged on the bottom wall of the furnace body and is recycled through an air return duct on the top wall, so that ordered vertical circulating air flow is formed. An impact type point-shaped heat source is converted into a mild surface-shaped heat source, and an efficient heat recovery path and a uniform vertical airflow field are constructed, so that the technical problems that an external scheme is low in heat efficiency and poor in temperature uniformity are fundamentally solved, and meanwhile, the advantage that components are easy to maintain is reserved; 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 temperature in the furnace 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 is heated by passing through the heating elements arranged in the air duct, 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 way of 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 will accelerate the aging, oxidation and damage of these components, significantly shorten their service life, and increase the risk of equipment failure. Secondly, 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 problems of difficult maintenance and short service life of components in 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 in the market that can balance high thermal performance and high maintenance convenience. 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: A modular aluminum foil annealing furnace, comprising: 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; A furnace door is provided on the furnace body for opening or closing the furnace body; A wind source and a heat supply device are modularly installed on the top of the furnace body and are located on the outside of the furnace body, and the heat supply device heats the airflow from the wind source; The furnace body is further provided with an air inlet duct, an air blowing duct and an air return duct which are in communication with each other, and the air inlet duct, air blowing duct and air return duct are in contact with the heat conduction layer; The air inlet duct is provided on the side wall and top wall of the furnace body and is in communication with the heat supply device for receiving heated airflow; The air blowing 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; The air return duct is provided on the top wall of the furnace body, and an air return port for recovering the airflow in the internal space of the furnace body is provided thereon, and the air return duct is in communication with the wind source to form a circulating air path.

[0011] Further provided: the air inlet duct comprises: A first air duct provided on the top wall of the furnace body, the first air duct is arranged in a staggered manner with the air return duct; A second air duct provided on the side wall of the furnace body, the second air duct is arranged in an inclined manner; And a third air duct provided on the side wall of the furnace body and close to the bottom of the furnace body, the third air duct is arranged in a horizontal manner; The first air duct is communicated with the heat supply device, the first air duct, the second air duct and the third air duct are communicated in sequence, and the third air duct is communicated with the blowing air duct.

[0012] Further provided is that the heat supply device further comprises: The air supplementing duct is connected between the return air duct and the air source; An air supplementing port and an electric control valve provided on the air supplementing duct are used to introduce external air flow into the air supplementing duct.

[0013] Further provided is that the heat supply device comprises: An outer shell; An inner container provided in the outer shell, the inner container being communicated with the air source and the air inlet duct, and a heat insulation space being formed between the inner container and the outer shell; A heat source provided on the outer shell; A heat conduction fin cage provided in the inner container, the heat conduction fin cage being connected with the heat source, and air flow from the air source being heated when flowing through the heat conduction fin cage in the inner container.

[0014] Further provided is that the heat source is integrally connected with the heat conduction fin cage.

[0015] Further provided is that the heat conduction fin cage comprises a central shaft integrally connected with the heat source, and the heat conduction fin cage is rotationally connected to the outer periphery of the central shaft.

[0016] Further provided is that the heat conduction fin cage comprises: A plurality of fins arranged in layers along the height direction, each fin being in a spiral shape; A plurality of radially extending extension portions are provided on each fin; A fin ring is enclosed to the outer circle of each layer of fins; wherein the adjacent extension portions and fin rings form gap channels for guiding air flow to pass through, so as to make the air flow in a turbulent state.

[0017] Further provided is that the heat supply device further comprises: A lifting mechanism for driving the oven door to vertically lift; A closing mechanism for horizontally moving the oven door descending to the closed position to compress and seal.

[0018] Further provided is that the lifting mechanism comprises: A power source provided 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 being provided between the output shaft and the oven door; Guide rails provided on both sides of the oven body; And a rolling member is arranged on the furnace door and in rolling contact with the guide rail to be driven by the power source to ascend or descend along the direction of the guide rail; wherein the rolling member and the guide rail are in clearance fit to allow the furnace door to have lateral movement space when the furnace door is lowered to the closed position.

[0019] Further, the closing mechanism comprises: A horizontal sliding rail is arranged on the furnace body, and a sliding groove is arranged on the horizontal sliding rail; A guide sliding rail is arranged between the furnace door and the furnace body, and a sliding block capable of sliding on the sliding groove is arranged on the guide sliding rail; A linear reciprocating device is connected with the guide sliding rail at the output end to drive the guide sliding rail to horizontally reciprocate along the direction of the horizontal sliding rail; A guide block is arranged on the furnace door and is in sliding fit with the guide sliding rail to drive the furnace door to ascend or descend along the direction of the guide sliding rail under the driving of the power source.

[0020] In summary, the present application has the following advantages: Firstly, in the present application, the blowing air duct is arranged on the bottom wall of the furnace body, and the return air duct is arranged on the top wall of the furnace body, so that an orderly whole vertical air flow field is formed in the inside of the furnace 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 material car carrying the aluminum foil roll first, and then uniformly flow through the whole 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 furnace that may occur in the traditional circulation mode. The structure ensures that the heat can fully penetrate and uniformly transfer to each part of the workpiece, significantly improving the temperature uniformity inside and outside, up and down of the material roll.

[0021] Moreover, the air source and the heating device are externally arranged on the top of the furnace body, and the heated high-temperature air flow is guided to the air inlet duct arranged in the top wall and the side wall of the furnace body. The heat of the air flow is first used to heat the large-area heat-conducting layer and the heat-conducting rod, and then the whole 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 air furnace into a large-area, low-speed radiation and convection combined heat source, solves the problem of uneven furnace temperature and local overheating caused by external heat source, and achieves high-precision furnace temperature uniformity comparable to the internal scheme while realizing fast and convenient maintenance of components. Since the air inlet duct, the blowing air duct and the return air duct and other high-temperature air flow channels 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 scheme, 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 the present scheme and is retransmitted into the furnace. The heat transfer loss is effectively reduced, the overall thermal efficiency of the system is significantly improved, and the inherent defect of high energy consumption of the external scheme is overcome.

[0022] Secondly, in the present application, the furnace body is modularly assembled, and by designing the furnace body, air source and heat supply device as independent standardized modules, each functional unit can complete pre-precision machining, assembly and testing in the manufacturing factory. Compared with 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. Thus, not only the overall cycle from equipment delivery to production is significantly shortened, but also the cost, difficulty and safety risk of on-site installation are greatly reduced. At the same time, the user can configure modules according to the initial production requirements to complete technical upgrading.

[0023] Thirdly, in the present application, by designing the air inlet 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 transversely arranged at the bottom of the side wall, a preheating flow path with maximum heat exchange travel is constructed. The structure forces the airflow carrying the highest heat energy to travel along this specific path before entering the furnace body, thereby greatly prolonging the contact time and contact area of the high-temperature airflow with the top wall and side wall heat conduction layers of the furnace body. The heat energy of the airflow is more fully and uniformly transferred to the heat conduction layer, strengthening the uniformity and heat capacity of the furnace inner wall surface heat source, providing a physical basis for achieving high-precision furnace temperature uniformity.

[0024] Fourthly, in the present application, by adding a supplementary air duct precisely controlled by an electric control valve, the present application changes the cooling stage in the annealing process from the traditional, slow and uncontrollable natural cooling to an actively intervened, rate accurately adjustable forced air cooling process. By quantitatively mixing external low-temperature airflow into the circulation loop according to the preset program during the cooling stage, the cooling rate of the furnace atmosphere can be significantly improved, thereby greatly shortening the cycle length of the entire annealing process. Moreover, the supplementary air duct is equivalent to a high-efficiency gas mixer. The externally introduced low-temperature airflow is pre-mixed with the high-temperature return air from the furnace body here, ensuring that the airflow temperature entering the subsequent heat supply device is relatively uniform. The risk of direct impact and quenching of high-temperature heat source components by un-mixed low-temperature airflow 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.

[0025] Fifthly, in the present application, by designing the heat supply device as a double-layer insulation structure and placing the heat conduction fin cage in the inner liner as the main airflow passage, while ensuring efficient heating of the airflow, 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 external pipeline heat dissipation in traditional external hot air units is effectively solved, and the heat utilization rate of the entire external system is significantly improved.

[0026] Sixth, in the present application, the heat source and the heat-conducting fin cage have various structures. One of them is that the heat source and the heat-conducting fin cage are connected integrally, so that heat can be transferred from the heat source to every part of the heat-conducting fin cage without any obstacle in the most efficient way of solid heat conduction. This ensures the instantaneousness of heat energy transfer and minimizes the loss, so that the surface of the heat-conducting fin cage can quickly reach and maintain a higher effective heat exchange temperature, thereby significantly improving the total ability and response speed of the entire heating device to transfer heat outward under the same heat source power.

[0027] The second is that the central shaft integrated with the heat source is designed as a stationary part, and the heat-conducting fin cage is connected to the outer periphery as a rotatable part. This scheme effectively separates static heat conduction and dynamic convective heat exchange in structure, so that the heat-conducting fin cage can stably guide heat from the central shaft while forcibly destroying and scraping the low-temperature air boundary layer attached to the surface of the fin through its high-speed rotation. This enhances the convective heat exchange coefficient between the fin cage surface and the main air flow, and improves static heat exchange to dynamic strong turbulent heat exchange, thereby doubling the overall heating efficiency and maximum heating power of the heating device.

[0028] The third is that the internal structure of the heat-conducting fin cage includes multiple layers of fins and outer fin rings, which construct a large heat exchange surface area 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 vortex and disturbance will naturally occur, so that the airflow is fully mixed and efficiently exchanged at the microscopic level before macroscopic rotation occurs, further strengthening the overall heat transfer performance of the device.

[0029] The fourth is that each fin is set to be helical. In the case where the heat-conducting fin cage does not rotate, a stable rotating component is induced in the main flow field through the static guiding effect of the helical surface on the airflow, forming a continuous vortex flow that can actively disturb and thin the air boundary layer attached to the surface of the fin, thereby improving the convective heat exchange coefficient and strengthening the heat transfer efficiency under static conditions. In the case where the heat-conducting fin cage rotates, the helical shape of the fin and the rotation of the heat-conducting fin cage work together to exert a circumferential mechanical shear force and an axial helical guiding force on the airflow, and the superposition of the two forces forms a three-dimensional composite turbulent flow field, thereby destroying the thermal boundary layer, increasing the heat exchange efficiency, and increasing the heating rate.

[0030] Seventh, in the present application, by decomposing the opening and closing of the furnace door into two independent mechanical actions of vertical lifting and horizontal movement, and by executing them respectively by dedicated lifting mechanism and closing mechanism, the large stroke, fast movement function to overcome the gravity of the furnace door, and the large thrust, short stroke compression function to achieve the sealing of the furnace mouth are separated. This avoids the problems of complex structure, long transmission chain and reliability decline caused by a single mechanism considering two greatly different movement requirements, and finally realizes a more stable and reliable structure.

[0031] Among them, by presetting the gap cooperation allowing lateral movement between the guide rail of the lifting mechanism and the rolling part, the vertical guide system is given a dual function. During lifting, the system provides stable and reliable vertical movement guide; while the furnace door is lowered to the closed position, the preset gap is converted into the necessary mechanical space for the horizontal movement of the closing mechanism.

[0032] By adopting a linear reciprocating device to drive a movable intermediate guide rail, and then pushing 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 distribution of force applied to the furnace door. It ensures that the heavy furnace door can maintain a stable posture during horizontal movement without deflection or jamming. Not only does it 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 more reliable and durable sealing effect. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is a schematic diagram of the three-dimensional structure of the modular aluminum foil annealing furnace; Figure 2 is a side view of the modular aluminum foil annealing furnace; Figure 3 is a top view of the modular aluminum foil annealing furnace; Figure 4 is Figure 3 A-A cross-sectional view in Figure 5 is Figure 3 B-B cross-sectional view in Figure 6 is Figure 3 C-C cross-sectional view in Figure 7 is a schematic diagram of part of the internal structure of the heating device; Figure 8 is Figure 3 D-D cross-sectional view in

[0034] 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; 200, furnace door; 300, lifting mechanism; 303, guide rail; 304, rolling piece; 310, power source; 311, rotating device; 312, output shaft; 313, first sprocket; 314, second sprocket; 315, third sprocket; 316, fourth sprocket; 400, closing mechanism; 401, transverse sliding rail; 402, sliding groove; 403, sliding block; 404, linear reciprocating device; 405, guide rail; 406, guide block; 500, air source; 501, volute; 502, air wheel; 503, rotary device; 504, air supplementing duct; 505, air supplementing port; 506, electric control valve; 600, heat supply device; 601, outer shell; 602, inner container; 603, heat source; 604, heat conduction fin cage; 605, central shaft; 606, fin; 607, fin ring; 608, extension; 609, gap passage. DETAILED DESCRIPTION

[0035] The application will be further described below in conjunction with the drawings.

[0036] In the description of the application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0037] A modular aluminum foil annealing furnace, as shown in Figure 1 and Figure 2 includes a modular furnace body 100. The furnace body 100 is spliced by 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 with the furnace body 100, and can perform air-tight sealing on the furnace opening when closed.

[0038] A modularized air supply 500 and a heating device 600 are installed on top of the furnace body 100. The air supply 500, for example, is a high-pressure centrifugal fan, which provides continuous power for the circulation of the gas in the furnace. The heating device 600, for example, is an electric heater, which is located adjacent to the outlet of the air supply 500 and is used to heat the circulating gas flow from the air supply 500.

[0039] As shown in Figure 3 and Figure 4 , in the present embodiment, the air supply 500 includes a volute 501 as a fixed housing, a fan wheel 502 located inside the volute 501, and a rotating device 503 for driving the fan wheel 502 to rotate.

[0040] Specifically, the volute 501 is a involute shell shaped like a snail shell, which expands along an Archimedes spiral. A central air inlet is provided at the center of the side wall of the volute 501 for sucking in the gas, and a tangential air outlet is provided at the tangent direction of the outer edge of the volute 501 for connecting the heating device 600. The volute 501 is used to effectively collect the high-speed gas thrown out by the fan wheel 502 and convert the kinetic energy of the gas into pressure energy, and then stably send out the gas.

[0041] The fan wheel 502 is located at the center of the cavity covered by the volute 501. The rotating device 503 provides power for the rotation of the fan wheel 502. In a specific example, the rotating device 503 can include an electric motor installed outside the volute 501, and the rotating shaft of the electric motor is connected with the fan wheel 502.

[0042] In operation, the rotating device 503 drives the fan wheel 502 to rotate at high speed in the volute 501. The gas from the return air duct 107 is axially sucked into the central air inlet of the volute 501 and then enters between the high-speed rotating fan wheels 502. Under the action of centrifugal force, the gas is accelerated and thrown out radially outward from the fan wheel 502, and finally collects in the volute 501 and is guided along the spiral channel of the volute 501 to the air outlet for discharge. In order to achieve accurate control of the circulating air volume in the furnace, the electric motor in the rotating device 503 can also be speed-adjusted through a frequency converter.

[0043] The inner surfaces of the top wall and the side wall of the furnace body 100 are covered with a heat-conducting layer 113. The heat-conducting layer 113 can be a metal plate with good heat-conducting performance, such as a stainless steel plate or a heat-conducting plate, or a high-temperature-resistant ceramic material, such as a silicon carbide plate. In order to further strengthen the transmission and distribution of heat in the furnace wall, a plurality of heat-conducting rods 111 are fixed on the surface of the heat-conducting layer 113 located on the top wall and the side wall, and the plurality of heat-conducting rods 111 are uniformly arranged at equal intervals.

[0044] As shown in Figure 3 , Figure 4 and Figure 5 and Figure 7As shown, in order to construct an efficient heat transfer and gas circulation path, the interior of the furnace body 100 is integrally provided with a set of interconnected air duct systems. The air duct system includes an air inlet duct 103, an air blowing duct 104, and an air return duct 107. All of the three are in large-area contact with the heat-conducting layer 113 of the inner wall of the furnace body 100, so as to achieve sufficient heat exchange between the gas flow and the furnace wall.

[0045] Specifically, the starting point of the entire circulation gas path is the external heating device 600. After being heated by the heating device 600, the high-temperature gas flow is first introduced into the air inlet duct 103 provided in the top wall and the side wall of the furnace body 100. The gas flow flows horizontally in the air inlet duct 103 of the top wall, and then turns into the air inlet duct 103 that is inclined downward along the side wall, and finally converges into the air blowing duct 104 at the bottom of the furnace body 100. In this process, the heat of the high-temperature gas flow is efficiently transferred to the heat-conducting layer 113 and the heat-conducting rod 111 in contact with it, thereby preheating the top wall and the side wall of the entire furnace body 100 into a uniform planar radiant heat source.

[0046] Then, the gas flow that has undergone preliminary heat exchange converges and is uniformly distributed in the air blowing duct 104 at the bottom wall of the furnace body 100, and then is blown into the internal working space of the furnace body 100 from bottom to top through the uniformly distributed air blowing ports 105, thereby gently and uniformly heating the aluminum foil roll placed on the trolley. After completing the heating of the workpiece, the gas flow rises to the top of the furnace body 100, is collected into the air return duct 107 through the air return port 106 provided in the top wall, and finally the air return duct 107 guides the collected gas atmosphere back to the inlet of the air source 500 outside the furnace body 100, thereby completing the entire closed circulation heating loop.

[0047] 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.

[0048] Specifically, the high-temperature gas flow from the heating device 600 at the top of the furnace body 100 first enters the first air duct 108 transversely arranged on 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 air return duct 107 is located on the opposite side, which are arranged staggered, forcing the high-temperature gas flow to cross the entire furnace roof, while sufficiently heating the top heat-conducting layer 113, and avoiding short circuiting between the inlet and return air flows from a fluid mechanics point of view.

[0049] The end of the first air duct 108, at the upper corner of the furnace body 100, is smoothly connected to the second air duct 109 extending downward along the sidewall of the furnace body 100. The second air duct 109 is not vertically downward, but is arranged at a preset inclined angle. Without increasing the wall thickness of the furnace body 100, the extended airflow travels a longer distance inside the sidewall, thereby increasing the contact time and heat exchange area of the airflow with the heat conduction layer 113 of the sidewall, so that the heat energy is more fully transferred to the sidewall.

[0050] The bottom of the second air duct 109, near the bottom wall of the furnace body 100, is connected to a third air duct 110 arranged transversely. The third air duct 110 functions similarly to a pressure equalization gas collection tank, which regularizes and buffers the airflow 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.

[0051] The first air duct 108, the second air duct 109, and the third air duct 110 are sequentially and end-to-end connected, so that part of the heat carried by the high-temperature airflow can be orderly and efficiently transferred to the top wall and the sidewall of the furnace body 100 before entering the working space of the furnace body 100, providing a solid physical basis for forming a uniform planar heat source.

[0052] The embodiment also includes a makeup air duct 504, one end of which is connected to the main circulating path outside the furnace, and the specific connection position is 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 port 505 is provided at this end. An electric control valve 506, such as a fast-response and high-precision electric butterfly valve or ball valve, is installed on the makeup air duct 504. The electric control valve 506 is connected to the central control system of the annealing furnace.

[0053] During the cooling stage of the annealing process, when it is necessary to accelerate the cooling of the furnace, the central control system can accurately control the opening angle and opening time of the electric control valve 506 according to the preset cooling process curve. The external low-temperature airflow, such as clean air or nitrogen gas as a protective gas, is sucked into the makeup air duct 504 through the makeup air port 505 and merges into the high-temperature return air flow extracted from the furnace body 100. The two airflows are fully mixed before entering the air source 500, forming a mixed airflow with reduced temperature, which is then sent to the subsequent circulating loop by the air source 500, thereby achieving rapid and controllable cooling of the gas in the furnace.

[0054] As Figure 5 and Figure 7As shown, in the present embodiment, the heat supply device 600 is a separate, efficient indirect heating module. The heat supply device 600 includes a shell 601 and an inner container 602 coaxially arranged inside the shell 601. The inner container 602 serves as the main passage of the 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 container 602 and the shell 601 constitutes a heat insulation space, which can be filled with high-performance insulation materials such as ceramic fiber to prevent heat loss to the outside.

[0055] In the present embodiment, the heat source 603 is a group of high-power resistance heating elements.

[0056] A heat-conducting fin cage 604 is arranged inside the inner container 602. The heat-conducting fin cage 604 is a component with a large heat exchange surface, which can be integrally cast or welded from high-thermal-conductivity metals such as heat-resistant alloys.

[0057] In operation, the large amount of heat generated by the heat source 603 is transferred to the heat-conducting fin cage 604 inside the inner container 602 in the form of solid-state heat conduction. The circulating airflow from the air source 500 flows rapidly in the passage of the inner container 602 and penetrates the spatial structure of the heat-conducting fin cage 604, which is rapidly heated by forced convection and then sent into the furnace body 100.

[0058] In a specific embodiment, to achieve the most efficient heat transfer between the heat source 603 and the heat-conducting fin cage 604, the two can be integrally connected. 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. This ensures 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.

[0059] In another embodiment aimed at actively enhancing heat exchange, the structure inside the heat supply device 600 is designed as two parts: static and dynamic. Specifically, it includes a fixed central shaft 605 that is integrally connected with the heat source 603, constituting a stationary core that stably guides heat. The heat-conducting fin cage 604 is a separate annular component that is rotatably connected to the outer periphery of the stationary central shaft 605 through a rotating mechanism such as a high-temperature-resistant bearing. This allows the heat-conducting fin cage 604 to receive heat from the central shaft 605 while rotating to strongly disturb the airflow passing through, thereby doubling the heat exchange efficiency.

[0060] In one specific embodiment, in order to increase the heat exchange area and enhance the turbulence effect, the heat-conducting fin cage 604 comprises a plurality of fin plates 606 stacked one on top of another along the height direction. Each fin plate 606 can be in the form of a base plate with a through hole in the center, and a plurality of extensions 608 extending radially outward from the base plate.

[0061] At the outermost periphery of each fin plate 606, there is a separate fin ring 607, which has a height equivalent to the thickness of the fin plate 606 and the extensions 608, and tightly encloses the outer ends of all the extensions 608. In this way, within the same fin plate 606, the gap channels 609 for guiding the airflow are defined between the inner walls of the fin ring 607 and the adjacent extensions 608.

[0062] When the airflow flows along the height direction through the gap channels 609 formed by the plurality of 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 forces the smooth airflow into a highly turbulent state, greatly enhancing the heat exchange between the airflow and the surfaces of the fin plates 606 and extensions 608 on a macroscopic scale, achieving the purpose of high-efficiency heat exchange.

[0063] In the present embodiment, each fin plate 606 is not a traditional flat disc, but a continuous spiral surface with a predetermined pitch. In one basic design, the spiral fin has an equal pitch design, i.e., the spiral surface has a uniform pitch in the entire height direction.

[0064] As an alternative embodiment, the geometric parameters of the spiral fin can also be designed to gradually change, to achieve precise control of the internal flow field.

[0065] For example, a variable-pitch spiral fin is used. Specifically, at the airflow inlet end of the heating device 600, the pitch of the spiral fin is small, forming a steep spiral channel; along the airflow direction, the pitch gradually increases, making the spiral channel tend to be flat in the middle and rear sections.

[0066] For another example, a variable-width spiral fin is used. In this design, the radial width of the fin plate 606 changes along the axial direction. One specific configuration is that the radial width of the fin plate 606 is maximum at the airflow inlet end and gradually narrows along the airflow direction, so that the entire heat-conducting fin cage 604 appears to be conical or stepped conical in appearance.

[0067] For example, variable-thickness spiral fins can be used. In this design, the cross-sectional thickness of the fin 606 itself varies. One approach is that the fin 606 is thickest near the central root and gradually thins outwards radially. Another approach is that the fin 606 has a larger overall thickness at the airflow inlet end and gradually thins outwards axially towards the outlet.

[0068] like Figure 1 , Figure 2 and Figure 8 As shown, in a preferred embodiment, the opening and closing of the furnace door 200 is accomplished by a two-stage drive 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 move vertically up and down a large distance to fully open or close the inlet and outlet of the furnace body 100; while the closing mechanism 400, after the lifting mechanism 300 has moved the furnace door 200 to the closed position, drives the furnace door 200 to move horizontally a short distance to achieve a final compression seal between the furnace door 200 and the furnace body 100. These two mechanisms are functionally independent and their actions are sequentially linked, jointly ensuring that the furnace door 200 can be opened quickly and sealed reliably.

[0069] Specifically, the lifting mechanism 300 includes a guide rail 303 serving as a vertical movement reference and rolling elements 304 cooperating with the guide rail 303. The guide rail 303, for example, consists of two high-strength heavy-duty rails, which are fixedly installed on both sides of the furnace body 100 inlet and outlet. Several rolling elements 304, such as those with rollers, are correspondingly provided on both sides of the furnace door 200. The rolling elements 304 are accommodated in the track grooves of the guide rail 303 and form rolling contact with it to ensure the smoothness and stability of the furnace door 200 during lifting.

[0070] The lifting mechanism 300 is powered by a power source 310 located above the furnace body 100 and an output shaft 312 driven by it, such as a power assembly consisting of a motor and a reducer. The output shaft 312 of the power source 310 is equipped with a chain drive mechanism. For example, a first sprocket 313 is provided at both ends of the output shaft 312, a second sprocket 314 and a fourth sprocket 316 are provided at the top of the furnace body 100, and a third sprocket 315 is provided at the bottom of the furnace body 100. The first sprocket 313, second sprocket 314, third sprocket 315, and fourth sprocket 316 are connected by a chain drive, with the fourth sprocket 316 providing a bend transition closer to the second sprocket. When the power source 310 is started, the output shaft 312 rotates, pulling the furnace door 200 through the chain drive mechanism, causing it to smoothly rise and fall vertically under the guidance of the rolling element 304 and the guide rail 303.

[0071] The rolling member 304 of the lifting mechanism 300 is not tightly fitted with the guide rail 303, but is fitted with a gap. The gap leaves a space for the oven door 200 to move horizontally, which is necessary for the horizontal pressing action of the closing mechanism 400.

[0072] After the oven door 200 is lowered to the closed position by the lifting mechanism 300, the 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 stability and accuracy of the horizontal movement of the oven door 200.

[0073] Specifically, the closing mechanism 400 includes a horizontal moving slide rail 401 as a fixed reference and a movable guide slide rail 405. The horizontal moving slide rail 401 is horizontally fixedly installed on the furnace body 100, and a sliding groove 402 for guiding is formed on the horizontal moving slide rail 401. The guide slide rail 405 is located between the oven door 200 and the furnace body 100, and a sliding block 403 capable of slidingly fitting with the sliding groove 402 of the horizontal moving slide rail 401 is arranged on the guide slide rail 405, so that the guide slide rail 405 can stably horizontally reciprocate along the track defined by the horizontal moving slide rail 401.

[0074] The side wall of the oven door 200 is provided with a guide block 406 which is in sliding fit 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.

[0075] When the oven door 200 needs to be pressed and sealed, the linear reciprocating device 404 is started, and the output end thereof pushes the guide slide rail 405. The guide slide rail 405 then stably moves towards the furnace body 100 along the fixed horizontal moving slide rail 401. In this process, the moving guide slide rail 405 pushes the oven door 200 horizontally, and the oven door 200 is finally pressed against the furnace body 100 by the sealing ring 112, so that the air-tight closure is completed.

[0076] 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 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, which has sufficient structural strength to support the weight of a single furnace body 100 module or the entire furnace body 100.

[0077] On the bottom of the working space inside the furnace body 100, i.e. on the upside of the blowing air duct 104 of the bottom wall, a material track 102 for carrying and guiding the material car is also laid. The material track 102 generally comprises two tracks made of high-temperature-resistant heavy steel material and arranged in parallel along the depth direction of the furnace body 100, and the laying direction 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 smoothly pushed into the furnace along the material track 102; after annealing is completed, it is smoothly pulled out along the material track 102, realizing the convenience and efficiency of the loading and unloading process.

[0078] The above-mentioned embodiments are only explanations of the present application, which 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.

Claims

1. A modular aluminum foil annealing furnace characterized by, The application relates to a modular furnace body (100) provided with a heat-conducting layer (113) on the inner wall of the furnace body (100), and heat-conducting rods (111) are further arranged on the heat-conducting layer (113) of the top wall and the side wall of the furnace body (100); a furnace door (200) is arranged on the furnace body (100) and used for opening or closing the furnace body (100); a wind source (500) and a heat supply device (600) are modularly arranged on the top of the furnace body (100) and located outside the furnace body (100), and the heat supply device (600) heats the airflow from the wind source (500); an air inlet air duct (103), an air blowing air duct (104) and an air return air duct (107) are further arranged in the furnace body (100) and are in communication with each other, and the air inlet air duct (103), the air blowing air duct (104) and the air return air duct (107) are in contact with the heat-conducting layer (113); the air inlet air duct (103) is arranged on the side wall and the top wall of the furnace body (100) and is in communication with the heat supply device (600) and used for receiving the heated airflow; the air blowing air duct (104) is arranged on the bottom wall of the furnace body (100) and is provided with an air blowing port (105) for blowing air into the internal space of the furnace body (100); the air return air duct (107) is arranged on the top wall of the furnace body (100) and is provided with an air return port (106) for recycling the airflow in the internal space of the furnace body (100), and the air return air duct (107) is in communication with the wind source (500) to form a circulating air path. The air inlet air duct (103) comprises a first air duct (108) arranged on the top wall of the furnace body (100) and staggered with the air return air duct (107); a second air duct (109) arranged on the side wall of the furnace body (100) and arranged in an inclined mode; and a third air duct (110) arranged on the side wall of the furnace body (100) and close to the bottom of the furnace body (100) and arranged in a horizontal mode; the first air duct (108) is in communication with the heat supply device (600), the first air duct (108), the second air duct (109) and the third air duct (110) are in sequence communication, and the third air duct (110) is in communication with the air blowing air duct (104). The application further comprises a supplementary air duct (504) connected between the air return air duct (107) and the wind source (500); a supplementary air port (505) and an electric control valve (506) arranged on the supplementary air duct (504) and used for introducing external airflow into the supplementary air duct (504). The heat supply device (600) comprises an outer shell (601); an inner container (602) arranged in the outer shell (601) and in communication with the wind source (500) and the air inlet air duct (103), and a heat insulation space is formed between the inner container (602) and the outer shell (601); ​ ​ ​ ​ 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: ​ ​ ​ A heat source (603) disposed on the shell (601); A heat-conducting fin cage (604) disposed in the inner container (602), the heat-conducting fin cage (604) being connected with the heat source (603), and the airflow from the air source (500) being heated when flowing through the heat-conducting fin cage (604) in the inner container (602).

5. The modular aluminum foil annealing oven of claim 4, wherein: The heat source (603) is integrally connected with the heat-conducting fin cage (604).

6. The modular aluminum foil annealing oven of claim 4, wherein: The heat-conducting fin cage (604) comprises a central shaft (605) integrally connected with the heat source (603), and the heat-conducting fin cage (604) is rotationally connected to the outer periphery of the central shaft (605).

7. The modular aluminum foil annealing oven of claim 4, wherein: The heat-conducting fin cage (604) comprises: A plurality of fins (606) stacked in the height direction, each fin (606) being spiral-shaped; Each of the fins (606) is provided with a plurality of radially extending extensions (608); A fin ring (607) is enclosed to the outer circle of each layer of fins (606); wherein the adjacent extensions (608) and fin rings (607) form gap channels (609) for guiding airflow to pass through, so as to make the airflow flow in a turbulent state.

8. The modular aluminum foil annealing oven of claim 1, wherein: Further comprising: A lifting mechanism (300) for driving the oven door (200) to vertically lift; A closing mechanism (400) for horizontally moving the oven door (200) descending to the closed position to compress and seal.

9. The modular aluminum foil annealing oven of claim 8, wherein: The lifting mechanism (300) comprises: A power source (310) disposed above the oven body (100), the power source (310) comprising a rotating device (311) and an output shaft (312) driven by the rotating device (311), and a chain transmission mechanism being provided between the output shaft (312) and the oven door (200); Guide rails (303) disposed on both sides of the oven body (100); And a rolling member (304) disposed on the oven door (200) and in rolling contact with the guide rails (303) to lift along the direction of the guide rails (303) under the drive of the power source (310); wherein the rolling member (304) and the guide rails (303) are in clearance fit, so as to allow the oven door (200) to have a space for lateral movement when it descends to the closed position.

10. The modular aluminum foil annealing oven of claim 9, wherein: The closing mechanism (400) comprises: A horizontal sliding rail (401) disposed on the oven body (100), the horizontal sliding rail (401) being provided with a sliding groove (402); A guide sliding rail (405) disposed between the oven door (200) and the oven body (100), the guide sliding rail (405) being provided with a sliding block (403) capable of sliding on the sliding groove (402); A linear reciprocating device (404), the output end of the linear reciprocating device (404) being connected with the guide sliding rail (405) to drive the guide sliding rail (405) to horizontally reciprocate along the direction of the horizontal sliding rail (401); The oven door (200) is provided with a guide block (406) sliding in cooperation with the guide sliding rail (405); so that the oven door (200) is lifted along the direction of the guide sliding rail (405) under the drive of the power source (310).

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