Annealing furnace for aluminium foil testing

Abstract

The application discloses an annealing furnace for aluminum foil test and relates to the field of heat treatment equipment. The technical scheme is as follows: the annealing furnace comprises a furnace body and an integrated moving part which is composed of a furnace door, a material rack and a supporting block. The furnace door is a connecting piece, the inner side of the furnace door is connected to the material rack which moves on the slide rail in the furnace body, and the outer side of the furnace door is connected to the supporting block which moves on the feeding slide rail outside the furnace body. The integrated moving part is driven by a linear reciprocating mechanism, so that the feeding and discharging and the opening and closing of the furnace door are linked. The application replaces the traditional side opening door with integrated linear motion, aims to solve the problems of the existing annealing furnace, such as large space occupation, long opening time of the furnace mouth, serious heat loss and easy deformation and failure of the furnace door, and has the beneficial effects of stable structure, reliable sealing, significant energy saving and improved space utilization.

Description

Technical Field

[0001] This invention relates to the field of heat treatment equipment, and in particular to an annealing furnace for aluminum foil testing. Background Technology

[0002] Annealing, a key metal heat treatment process, involves heating a metal material to a predetermined temperature, holding it for a sufficient time, and then cooling it at an appropriate rate. The aim is to reduce material hardness, stabilize dimensions, eliminate internal stress, and improve microstructure. In the aluminum foil production process, the annealing furnace is the core equipment for this process, and its structural design directly affects production efficiency, energy consumption, and product quality.

[0003] The annealing furnace disclosed in Chinese patent CN118326293B includes a furnace body with an opening and an independent loading trolley for carrying aluminum foil rolls. An independent furnace door is located at the furnace body opening; a common structure is two side-opening furnace doors that can swing outwards. The typical workflow is as follows: first, both furnace doors are fully opened, then the independent loading trolley is driven along a laid track into the furnace chamber; after the trolley is positioned, the two furnace doors are closed and locked to seal the furnace chamber for heating and annealing. Unloading is performed in reverse order. The side-opening furnace doors require a significant amount of lateral space on both sides of the front of the furnace body when opened, placing high demands on workshop layout planning. They are less adaptable to confined production environments, and the swinging doors can also cause inconvenience to surrounding logistics and personnel operations. Furthermore, the hinge structure of the heavy-duty side-opening furnace door is prone to sagging or deformation due to gravity after long-term use, which may lead to poor sealing between the furnace door and the furnace body. This requires regular adjustment and maintenance, increasing the maintenance cost and downtime of the equipment. Summary of the Invention

[0004] The purpose of this invention is to provide an annealing furnace for aluminum foil testing, which aims to solve the technical problems of existing annealing furnaces with side-opening furnace doors, such as large lateral space occupation, long-term open furnace opening during loading and unloading causing serious heat loss, and easy deformation of the furnace door cantilever structure affecting sealing reliability.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0006] An annealing furnace for aluminum foil testing, comprising:

[0007] The furnace body has an internal sliding rail installed along the inlet and outlet direction;

[0008] The support block and the feeding slide rail are located outside the furnace body; the feeding slide rail and the inner slide rail are in the same direction of entry and exit. The support block also includes a second rolling mechanism that rolls with the feeding slide rail so that the support block can reciprocate along the feeding slide rail.

[0009] The furnace door is separate from the furnace body and is mounted on the support block. The furnace door is provided with lugs.

[0010] A material rack is provided on the furnace door. The material rack includes a first rolling mechanism that rolls with the inner slide rail, so that the material rack can reciprocate on the inner slide rail.

[0011] A linear reciprocating mechanism, connected to a support block, is used to drive the support block to move on the feeding slide rail, so that the material rack can move in and out relative to the furnace body and the furnace door can open and close relative to the furnace body.

[0012] When the furnace door moves with the support block to the position of closing the furnace body, the clamping mechanism presses against the support lug with a rotating opening and closing action to press the furnace door tightly against the furnace body to form a seal.

[0013] Further configuration: The clamping mechanism includes:

[0014] Bearing housing, fixed to the furnace body;

[0015] The shaft is rotatably mounted inside the bearing housing;

[0016] The pressure block is fixed to the rotating shaft and is used to press against the support lugs of the furnace door as the shaft rotates.

[0017] The drive unit and the connecting rod connecting the drive unit and the rotating shaft are used to transmit the power of the drive unit to make the rotating shaft rotate;

[0018] The relative positions of the connection point between the output end of the drive device and the connecting rod, the connection point between the connecting rod and the rotating shaft, and the rotation center point of the rotating shaft are set such that when the pressure block presses against the final locking position on the support lug of the furnace door, the three are arranged collinearly or slightly beyond the collinearity to form an elbow-type self-locking structure.

[0019] Further configuration: The furnace door includes:

[0020] The inner frame facing the furnace body;

[0021] The outer frame facing away from the furnace body;

[0022] The air bridge structure connects the inner frame and the outer frame, and is used to block heat conduction from the inner frame to the outer frame.

[0023] Further configuration: The air bridge structure includes a vacuum cavity and an aluminum silicate fiber blanket located inside the vacuum cavity and on the surface of the inner frame.

[0024] Further configuration: A first heat insulation sealing element and a second heat insulation sealing element are sequentially arranged from the inside to the outside along the center of the furnace door on the furnace body, and the thickness of the second heat insulation sealing element is greater than the thickness of the first heat insulation sealing element;

[0025] The furnace door also includes a door frame connecting the inner frame and the outer frame; when the furnace door closes the furnace body, the inner frame abuts against the first heat insulation seal, and the door frame abuts against the second heat insulation seal.

[0026] The aluminum foil testing annealing furnace also includes an elastic seal disposed between the door frame and the first thermal insulation seal, the elastic seal being located downstream of the contact surface between the inner frame and the first thermal insulation seal.

[0027] Further configuration: The furnace body is provided with a furnace chamber, and an air inlet duct is formed between the furnace chamber and the inner wall of the furnace body; the furnace chamber includes a horizontal guide plate, a vertical guide plate, and an opening located at the lower part of the vertical guide plate;

[0028] The annealing furnace for aluminum foil testing also includes a heating device, at least a portion of which is located within the air inlet duct;

[0029] The aluminum foil test annealing furnace also includes an internal air source and an air guide duct. At least part of the internal air source is located on the horizontal guide plate. The air guide duct is arranged around the outer periphery of the internal air source. The annular inlet of the air guide duct is connected to the furnace chamber, and the annular outlet is connected to the air inlet duct, so that when the internal air source is working, it draws air from the furnace chamber into the air inlet duct.

[0030] The aluminum foil test annealing furnace also includes an air inlet pipe and an external air source. The air inlet pipe is connected to the air inlet duct, and the external air source is suitable for delivering airflow into the air inlet duct. The internal air source draws the airflow in the furnace chamber to the air inlet duct. The airflow flows downward in the air inlet duct and enters the furnace chamber through the opening to flow upward, so as to form a circulation.

[0031] Further settings: also includes:

[0032] The furnace top is located on the top of the furnace body and is detachably connected to the furnace body. The internal air source and heating device are located on the furnace top.

[0033] Further configuration: The internal air source includes:

[0034] A heat-insulating mounting base is provided on the top of the furnace;

[0035] A rotating device is mounted on a heat-insulated mounting base;

[0036] The drive shaft has one end connected to the rotating device and the other end passing through the heat-insulated mounting base and extending into the furnace. The end extending into the furnace is fixedly connected to the blower impeller.

[0037] The end face seal is located at the mating point between the drive shaft and the heat-insulating mounting base.

[0038] Further configuration: The internal air source also includes cooling blades fixed to the drive shaft in the section located outside the heat-insulated mounting base.

[0039] Further features include a blow-through exhaust pipe, one end of which is connected to the inside of the air duct, and the other end is connected to a negative pressure blowing and suction system.

[0040] In summary, the present invention has the following beneficial effects:

[0041] First, in this invention, the furnace door, material rack, and support block are integrated into a single moving component supported by internal and external tracks. Driven linearly in and out of the furnace body by a linear reciprocating mechanism, this replaces the traditional side-opening swing furnace door structure. This significantly reduces the dynamic space required on both sides of the furnace body when the equipment is open, improving the flexibility and space utilization of the workshop layout. The rapid movement of the single moving component drastically shortens the time the furnace interior is exposed to the external environment during loading and unloading, effectively suppressing the leakage of hot air and the intrusion of cold air. Compared to traditional step-by-step operation, this significantly reduces heat loss, achieving energy savings and maintaining furnace temperature stability. Furthermore, by simultaneously distributing the load of the moving component to both the internal slide rail and the external feeding slide rail, and using the furnace door as a rigid connecting beam, the sagging and deformation problems easily caused by the cantilever structure of traditional large side-opening doors are avoided. This ensures the long-term sealing accuracy of the furnace door and the furnace body sealing surface, improving the structural stability and reliability of the equipment and reducing maintenance costs.

[0042] Secondly, in this invention, the drive device drives the rotating shaft to rotate via a connecting rod, and the pressure block fixed to the rotating shaft presses against the furnace door lugs. When the connection point between the connecting rod and the rotating shaft approaches or exceeds the dead center position, a huge mechanical gain is generated, amplifying the output force of the drive device into a locking force several times greater. Specifically, when the three points are nearly collinear, the input force applied by the drive device is drastically amplified, thus allowing a small, low-energy-consumption drive device to generate a huge locking force applied to the pressure block and lugs. This ensures that the furnace door can be pressed extremely firmly against the furnace body, effectively resisting the high pressure generated inside the furnace during high-temperature annealing, achieving highly reliable sealing performance.

[0043] When the three connection or center points cross the collinear position, the mechanism achieves a self-locking state purely through mechanical means. At this point, the reaction force from the furnace door is transmitted along the connecting rod, and the direction of this force actually enhances the locking stability of the mechanism without generating a torque that would unlock it. This self-locking characteristic allows the drive device to stop working after completing the locking action, eliminating the need for continuous power to maintain the compressed state and reducing energy consumption during long-term heat preservation.

[0044] Third, in this invention, by setting a hollow bridge structure between the inner and outer frames of the furnace door and creating a vacuum cavity inside this hollow bridge structure, the heat transfer path through convection and conduction via the medium is essentially eliminated using the vacuum environment. This achieves a heat insulation effect far exceeding that of traditional filled insulation materials, allowing the outer frame of the furnace door to be maintained at a level much lower than the internal working temperature, significantly reducing the overall heat loss from the furnace door. Furthermore, the furnace door does not require a complex circulating cooling water structure, and it can ensure free expansion while maintaining excellent heat insulation performance.

[0045] Furthermore, by setting an aluminum silicate fiber blanket on the side of the vacuum cavity near the inner frame, the fiber blanket acts as a thermal radiation barrier, effectively blocking and absorbing infrared thermal radiation from the high-temperature inner frame. This solves the technical problem that thermal radiation becomes the main heat transfer mode in a vacuum environment. It further suppresses radiative heat transfer on the basis of blocking conduction and convection, and finally achieves good thermal insulation performance, and effectively prevents the temperature rise and deformation of the outer frame caused by thermal radiation.

[0046] Fourth, in this invention, by setting first and second heat insulation seals of different thicknesses on the furnace body, and by having the high-temperature inner frame of the furnace door abut against the thinner first heat insulation seal, while the lower-temperature door frame abuts against the thicker second heat insulation seal, a stepped heat and pressure shielding structure is constructed. This allows the first seal to bear the main temperature gradient, thereby creating a low-temperature, low-heat radiation working environment for the second main seal. This greatly slows down the aging and failure process of the main seal due to high temperature, and achieves a significant improvement in the long-term reliability and service life of the sealing structure without increasing the furnace door clamping force.

[0047] Furthermore, by placing an elastic seal between the door frame and the first thermal insulation seal, and downstream of the first sealing contact surface, an additional chamber is formed. The elastic seal utilizes its elasticity to compensate for potential gaps caused by thermal expansion and contraction. The first seal also bears the majority of the temperature gradient, thus providing double protection for the elastic seal and preventing direct erosion by high-temperature gases. This ensures ultimate airtightness while also improving the overall sealing system's adaptability to complex operating conditions.

[0048] Fifth, in this invention, by setting the heating device in the air inlet duct formed between the furnace chamber and the inner wall of the furnace, and using the internal air source located at the top of the furnace chamber, the forced airflow forms a circulating path that is drawn out from the top of the furnace chamber, flows downward along the air inlet duct, and then enters from the bottom opening of the furnace chamber and flows upward. This achieves physical isolation between the heating functional area and the material processing area, so that the material is completely protected from direct heat radiation from the heating device and is heated only by uniform and controllable forced convection hot air. This fundamentally solves the problem of local overheating caused by uneven radiation, greatly improves the uniformity of the temperature field inside the furnace, and provides a key guarantee for the annealing quality of heat-sensitive materials such as aluminum foil.

[0049] Furthermore, by directly connecting the air inlet pipe of the external air source to the high-speed circulating air inlet duct, the cold air or fresh gas introduced from the outside can be fully and instantaneously premixed with the heated mainstream circulating hot air before reaching the furnace. This effectively avoids thermal shock damage caused by the direct impact of cold air on high-temperature materials, ensures the uniformity and gentleness of the blowing or cooling process, and improves the accuracy of process control and product yield.

[0050] Sixth, in this invention, by integrating the internal air source and heating device into an independent furnace top that is detachably connected to the furnace body, a thermal function module that can be hoisted and replaced as a whole is formed. This transforms the operation of vulnerable or maintenance-requiring components such as fans and heaters from the traditional complex method of entering the furnace or disassembling from the side to the offline operation of the entire module. This greatly shortens the downtime for equipment maintenance, reduces the difficulty of operation and safety risks, and significantly improves the maintainability and uptime of the equipment throughout its entire life cycle.

[0051] Furthermore, this modular design separating the furnace top and furnace body decouples the heating circulation system from the furnace body insulation structure, greatly facilitating subsequent technical upgrades or performance modifications. Users can adjust the heating power or circulating air volume of the equipment by replacing furnace top modules of different specifications, thus extending the overall service life and technical applicability of the equipment.

[0052] Seventh, in the internal air source of the present invention, cooling blades that rotate synchronously with the drive shaft are fixedly installed on the external section of the drive shaft that passes through the heat-insulating mounting base. The rotational power of the drive shaft itself drives the cooling blades to form a forced air cooling system that does not require additional energy consumption. This system can continuously blow external cold air to the drive shaft and bearing area, thereby efficiently removing the heat conducted from the furnace. This replaces the traditional complex and faulty circulating water cooling system. While simplifying the equipment structure and reducing operating energy consumption, it eliminates the risk of equipment failure caused by problems such as water leakage and scaling, and significantly improves the operational stability and reliability of the internal air source under high-temperature conditions.

[0053] Eighth, this invention uses a purging and exhaust system to blow fresh air from outside the furnace into the heating system. This allows the fresh air to be pre-mixed with the circulating hot air and then evenly enter the furnace to effectively dilute the rolling oil and gas volatilized from the aluminum foil during the heating process. This keeps the oil and gas concentration in the furnace within the range required by the process, thus avoiding surface quality defects such as yellow spots on the product caused by incomplete oil removal or secondary condensation of oil and gas, and ensuring the high cleanliness of the finished aluminum foil.

[0054] Furthermore, by automatically controlling and proportionally introducing an appropriate amount of cold air from outside the furnace into the heating system during the cooling phase of the annealing process, mixing it with the high-temperature gas inside the furnace to precisely regulate the overall temperature of the circulating airflow, closed-loop control of the cooling rate is achieved. This ensures that the cooling strictly follows the preset cooling process curve, avoiding the problem of substandard material mechanical properties caused by excessively fast or slow cooling, and ensuring the accuracy and repeatability of the annealing process. Attached Figure Description

[0055] Figure 1 This is a three-dimensional structural diagram of an annealing furnace for aluminum foil testing. Figure 1 ;

[0056] Figure 2 This is a three-dimensional structural diagram of an annealing furnace for aluminum foil testing. Figure 2 ;

[0057] Figure 3 This is a top view of the annealing furnace used for aluminum foil testing;

[0058] Figure 4 yes Figure 3 AA section diagram;

[0059] Figure 5 yes Figure 4 Enlarged view of point C in the image;

[0060] Figure 6 yes Figure 3 BB section diagram;

[0061] Figure 7 This is a schematic diagram of the internal air source structure.

[0062] In the diagram, 100 is the furnace body; 101 is the inner slide rail; 102 is the furnace top; 103 is the air inlet pipe; 104 is the blow-through exhaust pipe; 105 is the air inlet duct; 106 is the first heat insulation seal; and 107 is the second heat insulation seal.

[0063] 110. Furnace chamber; 111. Horizontal baffle; 112. Vertical baffle; 113. Opening;

[0064] 200. Furnace door; 201. Support lug; 202. Inner frame; 203. Outer frame; 204. Hollow bridge structure; 205. Elastic seal; 206. Door frame;

[0065] 300. Material rack; 301. First rolling mechanism;

[0066] 400. Support block; 401. Feeding slide rail; 402. Second rolling mechanism; 410. Linear reciprocating mechanism;

[0067] 500. Clamping mechanism; 501. Clamping block; 502. Rotating shaft; 503. Bearing seat; 504. Connecting rod; 505. Drive device;

[0068] 600. Internal air source; 601. Insulated mounting base; 602. Drive shaft; 603. Rotating device; 604. Blower impeller; 605. Cooling blades; 606. End face seal; 610. Air guide tube;

[0069] 700. Heating device. Detailed Implementation

[0070] The present invention will be further described in detail below with reference to the accompanying drawings.

[0071] 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.

[0072] An annealing furnace for aluminum foil testing, such as Figure 1 and Figure 2 It includes the furnace body 100 and a mobile assembly that can realize the integrated action of feeding and discharging materials and opening and closing the furnace door 200.

[0073] The furnace body 100 is the main structure for the annealing process, and an inner slide rail 101 is fixedly laid inside it along the preset material inlet and outlet direction. On the outside of the furnace body 100, such as on the ground or foundation, a feeding slide rail 401 parallel to the direction of the inner slide rail 101 is also laid. These two sets of slide rails, located inside and outside the furnace body 100 respectively, together constitute a continuous motion guiding system.

[0074] like Figure 3 and Figure 4The furnace also includes a furnace door 200, which is separate from the furnace body 100 and can move independently. The furnace door 200, as a rigid connecting structure, has a material rack 300 fixedly connected to its inner surface facing the inside of the furnace body 100, while a support block 400 is fixedly connected to its bottom facing away from the outside of the furnace body 100. The material rack 300 is used to support the aluminum foil to be annealed, and its bottom is provided with a first rolling mechanism 301 that can roll into the inner slide rail 101 inside the furnace body 100. The support block 400 is an external support component, and its bottom is provided with a second rolling mechanism 402 that can roll into the feeding slide rail 401 outside the furnace body 100. In this way, the furnace door 200 connects the inner material rack 300 and the outer support block 400 into a whole, so that when this whole moves, its inner side is supported and guided by the inner slide rail 101, and its outer side is supported and guided by the feeding slide rail 401.

[0075] To drive the moving assembly, the device also includes a linear reciprocating mechanism 410. One end of the linear reciprocating mechanism 410 is connected to a support block 400 outside the furnace body 100, and the other end is connected to a fixed base. Through its reciprocating motion, it can directly push or pull the support block 400 onto the feeding slide rail 401, thereby driving the entire moving assembly to realize the entry and exit of the material rack 300 and the opening and closing of the furnace door 200. The linear reciprocating mechanism 410 can be implemented as an electric push rod, a hydraulic cylinder, or a gear and rack mechanism driven by a motor.

[0076] In addition, to ensure sealing during annealing, lugs 201 are provided on the outer peripheral wall of the furnace door 200. A pressing mechanism 500 is provided at a corresponding position on the furnace body 100. When the furnace door 200 moves to the position of completely closing the opening 113 of the furnace body 100 under the drive of the moving assembly, the pressing mechanism 500 is activated, for example by rotating and opening and closing, acting on the lugs 201 on the furnace door 200, thereby applying a strong pressure to tightly press the furnace door 200 against the furnace body 100, forming a reliable high-temperature seal. The clamping mechanism 500 includes a bearing seat 503 fixed on the furnace body 100, a rotating shaft 502 rotatably mounted in the bearing seat 503, and a pressure block 501 fixed on the rotating shaft 502. The pressure block 501 is used to press against the lug 201 of the furnace door 200 as the rotating shaft 502 rotates. It also includes a drive device 505 and a connecting rod 504 connecting the drive device 505 and the rotating shaft 502 to transmit the power of the drive device 505 to make the rotating shaft 502 rotate.

[0077] When the furnace door 200 moves to the closed position, the drive device 505 is activated, and its power is transmitted to the rotating shaft 502 through the connecting rod 504, causing the rotating shaft 502 to rotate. As the rotating shaft 502 rotates, the pressure block 501 fixed on it also swings, and finally presses its working surface against the corresponding lug 201 of the furnace door 200, thereby generating a locking force and tightly pressing the furnace door 200 onto the furnace body 100. The drive device 505 here can be selected from cylinders, hydraulic cylinders, or a lead screw mechanism driven by an electric motor, depending on the design requirements.

[0078] The drive unit 505 can be fixed to the furnace body 100 or the ground foundation. Its output end is connected to one end of the connecting rod 504 through the first hinge point. The other end of the connecting rod 504 is connected to the rotating shaft 502 through the second hinge point to form a complete crank-connecting rod 504 transmission structure. The pressure block 501 fixed on the rotating shaft 502 is positioned corresponding to the lug 201 provided on the outer wall of the furnace door 200. The working surface of the pressure block 501 faces the lug 201 and is used to contact the lug 201 and apply pressure when the rotating shaft 502 rotates.

[0079] The specific geometric dimensions and connection positions of the components of this mechanism are configured such that when the drive device 505 drives the connecting rod 504 to rotate the rotating shaft 502, causing the pressure block 501 to fully press against the support lug 201, the mechanism reaches its final locked position. In this position, the first hinge point at the output end of the drive device 505, the second hinge point between the connecting rod 504 and the rotating shaft 502, and the rotation center of the rotating shaft 502 itself are arranged in a spatially collinear or slightly beyond the collinear position. This makes the clamping mechanism 500 a toggle-type self-locking structure, relying on the geometric relationship of the mechanical components rather than continuous power input to maintain the locking force.

[0080] like Figure 4 and Figure 5 To achieve optimal thermal insulation performance and reduce heat loss, the furnace door 200 employs a multi-layer composite thermal insulation structure. Structurally, the furnace door 200 includes an inner frame 202 facing the high-temperature interior of the furnace body 100, and an outer frame 203 facing away from the external environment.

[0081] Between the inner frame 202 and the outer frame 203, a hollow bridge structure 204 is provided as the core thermal insulation unit. This hollow bridge structure 204 physically connects the inner and outer frames, and its main function is to block heat conduction from the high-temperature inner frame 202 to the low-temperature outer frame 203. This avoids the thermal bridging effect formed by the metal frame and reduces heat conduction.

[0082] To further enhance the thermal insulation effect, the interior of the air bridge structure 204 is designed as a sealed vacuum chamber. By evacuating the air from the chamber to create a vacuum, heat convection and heat conduction through the air medium can be eliminated to the greatest extent possible. Furthermore, an aluminum silicate fiber blanket is laid inside this vacuum chamber near the surface of the inner frame 202. This fiber blanket acts as a heat radiation barrier, blocking and absorbing infrared heat radiation generated by the high-temperature inner frame 202, thus solving the technical problem of heat radiation becoming the primary heat transfer mode in a vacuum and achieving comprehensive blocking of all three modes of heat transfer.

[0083] To ensure the absolute airtightness of the furnace door 200 under high temperature and high pressure conditions, a multi-stage composite sealing system is installed between the furnace body 100 and the furnace door 200.

[0084] Specifically, at the edge of the opening 113 of the furnace body 100, a first heat-insulating seal 106 and a second heat-insulating seal 107 are fixedly installed sequentially from the inside to the outside along the center of the furnace door 200. These two seals form a stepped sealing surface, wherein the thickness of the second heat-insulating seal 107 located on the outer side is greater than that of the first heat-insulating seal 106 located on the inner side.

[0085] Corresponding to the sealing structure on the furnace body 100, the furnace door 200, in addition to the inner frame 202 and the outer frame 203, also includes a door frame 206 for connecting the two frames. When the furnace door 200 moves to the position of closing the furnace body 100, the inner frame 202, which has the highest temperature on the furnace door 200, will first abut against the first heat-insulating seal 106, forming the first high-temperature heat insulation barrier. For example, the first heat-insulating seal 106 can be a high-temperature resistant aluminum silicate sealing ring. At the same time, the relatively cooler door frame 206 abuts against the thicker second heat-insulating seal 107, forming the second main pressure and gas seal, for example, using a high-density glass fiber braided rope treated with graphite impregnation.

[0086] In addition, the sealing system includes a resilient seal 205. This resilient seal 205 is positioned downstream of the inner frame 202, where it contacts the first thermal insulation seal 106. This arrangement allows the resilient seal 205 to form a third layer of protection, using its elasticity to compensate for minute gaps that may arise from thermal expansion and contraction, thus providing double protection for the long-term reliability of the entire sealing system. For example, a custom-shaped sealing strip made of high-temperature resistant silicone rubber or fluororubber can be used to capture any trace amounts of gas that might penetrate the first seal, and its elasticity can also compensate for minute gaps that may arise from thermal expansion and contraction, thus providing double protection for the long-term reliability of the entire sealing system.

[0087] like Figure 6As shown, in order to achieve uniform heating of the material inside the furnace, a forced hot air circulation system is installed inside the furnace body 100. This system has an independent furnace chamber 110 inside the furnace body 100. The furnace chamber 110 serves as the actual material heating area, and its outer wall naturally forms a ring-shaped air inlet duct 105 with the inner wall of the furnace body 100. The furnace chamber 110 itself is composed of guide vane components, including a horizontal guide vane 111 at its top and vertical guide vanes 112 forming its side walls. An opening 113 connecting the air inlet duct 105 to the interior of the furnace chamber 110 is provided at the lower part of the vertical guide vane 112.

[0088] The circulation system includes a heating device 700 as a heat source and an internal air source 600 as a power source. The heating device 700, such as a tubular resistance heater, is installed inside the air inlet duct 105, thereby achieving physical isolation between the heating zone and the material zone. The internal air source 600, such as a high-temperature axial flow fan, has its impeller 604 mounted on a horizontal guide plate 111 at the top of the furnace 110. A guide duct 610 is also arranged annularly around the internal air source 600. The lower end of the guide duct 610 serves as an annular inlet, communicating with the top space of the furnace 110; its side has an annular outlet, communicating with the air inlet duct 105.

[0089] When the internal air source 600 is operating, it draws gas from the upper part of the furnace 110 through the annular inlet of the air guide duct 610 and forces it into the air inlet duct 105 through the annular outlet. The gas flows downward in the air inlet duct 105, and after passing through and being heated by the heating device 700 therein, it forms high-temperature hot air. The high-temperature hot air finally re-enters the bottom of the furnace 110 through the opening 113 at the lower part of the vertical guide plate 112, and flows upward through the material to be processed. After completing the heat exchange, it is drawn back into the furnace 110 by the internal air source 600 at the top, forming a continuous and stable internal heat circulation with top return air and bottom supply air.

[0090] like Figure 4 As shown, this embodiment also includes an external air source and an air inlet pipe 103. One end of the air inlet pipe 103 is connected to the external air source, and the other end is directly connected to the air inlet duct 105 inside the furnace. By activating the external air source, air from outside the furnace can be sent into the air inlet duct 105, where it mixes with the internally circulating hot air and then enters the furnace chamber 110. The external air source is an external device, not shown in the figure. The external air source can be a negative pressure device or a blower.

[0091] like Figure 6As shown, a separate furnace top 102 is also included. The furnace top 102 is detachably connected to the furnace body 100, for example, by bolts. The aforementioned internal air source 600 and heating device 700 are both integrated and mounted on this detachable furnace top 102, forming a complete thermal assembly module with full heating and circulation functions. When the internal air source 600 or heating device 700 needs to be inspected or replaced, there is no need for personnel to enter the furnace body 100 for complex operations. The entire furnace top 102 module can be hoisted and removed from the furnace body 100 for convenient maintenance of all core components, greatly improving the convenience and safety of operation.

[0092] like Figure 7 As shown, the internal air source 600, serving as the power component for providing hot air circulation, is integrally mounted on the removable furnace top 102. The internal air source 600 includes a heat-insulated mounting base 601 serving as the mounting reference, which is directly fixed to the furnace top 102. A rotating device 603, such as a variable frequency speed-regulating motor, is mounted on the outer side of the heat-insulated mounting base 601, i.e., the side facing away from the furnace chamber 110. A drive shaft 602 passes through the center of the heat-insulated mounting base 601, with one end outside the furnace connected to the output end of the rotating device 603, and the other end extending into the furnace chamber 110 and fixedly connected to a blower impeller 604 for agitating the airflow within the furnace. An end-face seal 606 is also provided at the location where the drive shaft 602 passes through the heat-insulated mounting base 601 to prevent high-temperature gas from leaking outwards along the shaft gap.

[0093] To ensure stable operation of the rotating device 603 without the use of external cooling water, the internal air source 600 also includes a self-cooling structure. Specifically, cooling blades 605 are fixedly connected to the section of the drive shaft 602 located outside the heat-insulated mounting base 601. When the rotating device 603 drives the drive shaft 602 to rotate, the cooling blades 605 also rotate synchronously at high speed, acting like a small fan. This continuously blows ambient air from outside the furnace onto the journal of the drive shaft 602 and the upper surface of the heat-insulated mounting base 601, efficiently removing the heat conducted from inside the furnace through the drive shaft 602 via forced air cooling, thereby ensuring that the bearings and the rotating device 603 are always within a safe operating temperature range.

[0094] like Figure 6 As shown, in order to achieve precise control and purification of the furnace atmosphere, the annealing furnace also includes a purging and exhaust system. This system includes a purging and exhaust pipe 104 introduced from outside the furnace, and a negative pressure purging and suction system connected to the pipe. The negative pressure purging and suction system is an external device and is not shown in the figure.

[0095] Specifically, the exhaust pipe 104 passes through the side wall of the furnace body 100, and its end is directly connected to the interior of the air guide duct 610 around the internal air source 600. As the area with the highest gas circulation speed and most thorough mixing within the furnace, placing the end of the pipe in the air guide duct 610 ensures the most efficient exchange and mixing effect for both blowing in and extracting gas. The other end of the pipe extends outside the furnace and connects to a negative pressure blowing and suction system, which can be a fan unit capable of providing both positive pressure blowing and negative pressure suction functions.

[0096] When it is necessary to dilute the oil fumes in the furnace or to cool down the process, the negative pressure blowing and suction system blows fresh air into the blowing and exhaust pipe 104. The air enters the air guide duct 610 through the pipeline and is premixed with the circulating hot air before being evenly introduced into the furnace chamber 110. When it is necessary to discharge waste gas, the system switches to suction mode to extract the furnace gas collected in the air guide duct 610 and discharge it to the external treatment system.

[0097] The above embodiments are merely explanations of the present invention and are not intended to limit the present invention. After reading this specification, those skilled in the art can make modifications to these embodiments without contributing any inventive step, but as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. An annealing furnace for aluminum foil testing, characterized in that, include: The furnace body (100) has an inner slide rail (101) arranged inside along the inlet and outlet direction; The support block (400) and the feeding slide rail (401) are located outside the furnace body (100); the feeding slide rail (401) and the inner slide rail (101) are in the same direction of entry and exit. The support block (400) also includes a second rolling mechanism (402) that rolls with the feeding slide rail (401) so that the support block (400) can reciprocate along the feeding slide rail (401). The furnace door (200) is separately provided from the furnace body (100). The furnace door (200) is located on the support block (400), and the furnace door (200) is provided with lugs (201). A material rack (300) is provided on the furnace door (200). The material rack (300) includes a first rolling mechanism (301) that rolls with the inner slide rail (101) so that the material rack (300) can reciprocate on the inner slide rail (101). A linear reciprocating mechanism (410) is connected to a support block (400) to drive the support block (400) to move on the feeding slide rail (401) so that the material rack (300) can move in and out relative to the furnace body (100) and the furnace door (200) can open and close relative to the furnace body (100). The pressing mechanism (500) presses against the lug (201) with a rotating opening and closing action when the furnace door (200) moves with the support block (400) to the position of closing the furnace body (100), thereby pressing the furnace door (200) against the furnace body (100) to form a seal; wherein, The clamping mechanism (500) includes: The bearing housing (503) is fixed on the furnace body (100); The rotating shaft (502) is rotatably mounted in the bearing housing (503); The pressure block (501) is fixed to the rotating shaft (502) and is used to press against the lug (201) of the furnace door (200) as the rotating shaft (502) rotates; The drive unit (505) and the connecting rod (504) connecting the drive unit (505) and the rotating shaft (502) are used to transmit the power of the drive unit (505) to make the rotating shaft (502) rotate. The relative positions of the connection point between the output end of the drive device (505) and the connecting rod (504), the connection point between the connecting rod (504) and the rotating shaft (502), and the rotation center point of the rotating shaft (502) are set such that when the pressure block (501) presses against the final locking position on the lug (201) of the furnace door (200), the three are arranged collinearly to form an elbow-type self-locking structure.

2. The annealing furnace for aluminum foil testing according to claim 1, characterized in that: The furnace door (200) includes: The inner frame (202) facing the furnace body (100); The outer frame (203) on the side facing away from the furnace body (100); A hollow bridge structure (204) is connected between the inner frame (202) and the outer frame (203) to block heat conduction from the inner frame (202) to the outer frame (203).

3. The annealing furnace for aluminum foil testing according to claim 2, characterized in that: The air bridge structure (204) includes a vacuum cavity and an aluminum silicate fiber blanket located inside the vacuum cavity and on the surface of the inner frame (202).

4. The annealing furnace for aluminum foil testing according to claim 2, characterized in that: The furnace body (100) is provided with a first heat insulation sealing element (106) and a second heat insulation sealing element (107) from the inside to the outside along the center of the furnace door (200). The thickness of the second heat insulation sealing element (107) is greater than the thickness of the first heat insulation sealing element (106). The furnace door (200) also includes a door frame (206) connecting the inner frame (202) and the outer frame (203); when the furnace door (200) closes the furnace body (100), the inner frame (202) abuts against the first heat insulation seal (106), and the door frame (206) abuts against the second heat insulation seal (107); The aluminum foil test annealing furnace also includes an elastic seal (205) disposed between the door frame (206) and the first heat insulation seal (106), the elastic seal (205) being located downstream of the contact surface between the inner frame (202) and the first heat insulation seal (106).

5. The annealing furnace for aluminum foil testing according to claim 1, characterized in that: The furnace body (100) is provided with a furnace chamber (110), and an air inlet duct (105) is formed between the furnace chamber (110) and the inner wall of the furnace body (100); the furnace chamber (110) includes a horizontal guide plate (111), a vertical guide plate (112) and an opening (113) located at the lower part of the vertical guide plate (112); The aluminum foil test annealing furnace also includes a heating device (700), at least a portion of which is located within the air inlet duct (105); The aluminum foil test annealing furnace also includes an internal air source (600) and an air guide duct (610). At least a portion of the internal air source (600) is located on a horizontal guide plate (111). The air guide duct (610) is arranged around the outer periphery of the internal air source (600). The annular inlet of the air guide duct (610) is connected to the furnace chamber (110), and the annular outlet is connected to the air inlet duct (105), so that when the internal air source (600) is working, it draws air from the furnace chamber (110) into the air inlet duct (105). The aluminum foil test annealing furnace also includes an air inlet pipe (103) and an external air source. The air inlet pipe (103) is connected to the air inlet duct (105), and the external air source is suitable for delivering airflow into the air inlet duct (105). The internal air source (600) draws the airflow in the furnace chamber (110) into the air inlet duct (105). The airflow flows downward in the air inlet duct (105) and enters the furnace chamber (110) through the opening (113) to flow upward, so as to form a circulation.

6. The annealing furnace for aluminum foil testing according to claim 5, characterized in that: Also includes: A furnace top (102) is located on top of the furnace body (100). The furnace top (102) is detachably connected to the furnace body (100). The internal air source (600) and heating device (700) are located on the furnace top (102).

7. The annealing furnace for aluminum foil testing according to claim 6, characterized in that: The internal air source (600) includes: A heat-insulating mounting base (601) is provided on the furnace top (102); A rotating device (603) is mounted on a heat-insulated mounting base (601); A drive shaft (602) is connected at one end to a rotating device (603), and at the other end passes through a heat-insulating mounting base (601) and extends into the furnace (110). A blower impeller (604) is fixedly connected to the end extending into the furnace (110). An end face seal (606) is provided at the mating point between the drive shaft (602) and the heat-insulating mounting base (601).

8. The annealing furnace for aluminum foil testing according to claim 7, characterized in that: The internal air source (600) also includes cooling blades (605) fixed to the drive shaft (602) in the section outside the heat-insulated mounting base (601).

9. The annealing furnace for aluminum foil testing according to claim 5, characterized in that: It also includes a blow-through exhaust pipe (104), one end of which is connected to the inside of the air guide duct (610), and the other end is connected to a negative pressure blowing and suction system.

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