Furnace door opening and closing mechanism of aluminum bar production smelting furnace

Abstract

The invention relates to the technical field of smelting furnaces, and discloses a furnace door opening and closing mechanism of an aluminum bar production smelting furnace, which comprises a furnace body, an overturning shaft, a furnace door, a gear and a rack, the furnace door can be propped against the ground after being opened by overturning forwards, a lever structure is arranged in a pit, a vertical frame is arranged on a power arm of the lever structure, and a riding wheel group is arranged at the top of the vertical frame; the riding wheel set supports a lifting pedal used for bearing a forklift, a resisting arm of the lever structure pulls the gear to move downwards through a zipper structure, and a first reset mechanism for pulling the rack to move upwards is arranged on the furnace body. According to the mechanism, the lever is triggered to be linked with the gear through pressure applied by the weight of the forklift to achieve automatic opening and closing of the furnace door, workers do not need to be close to the high-temperature area of the furnace body for operation, the high-temperature burning risk is avoided, body discomfort caused by the high-temperature environment is reduced, and the operation safety and comfort are remarkably improved; extra electric power or hydraulic driving devices are not needed, and pure mechanical structure linkage is adopted in the whole opening and closing process.

Description

Technical Field

[0001] This invention relates to the field of furnace technology, and in particular to a furnace door opening and closing mechanism for an aluminum rod production furnace. Background Technology

[0002] In the aluminum rod production process, the furnace, as the core equipment, needs to operate continuously to ensure production efficiency, which results in the furnace being surrounded by a high-temperature environment for a long time. To avoid workers directly contacting the high-temperature area, the industry currently commonly uses forklifts in conjunction with pusher rakes (such as the structure disclosed in patent CN204079378U) for feeding operations. The forklifts use pusher rakes to feed scrap aluminum or aluminum ingots into the furnace through the feed inlet.

[0003] Existing furnaces typically feature a lift-type furnace door at the feed inlet, with a traction mechanism at the top of the furnace body to control the door's movement. The switch controlling this mechanism is usually located on one side of the furnace. This design forces operators to approach the furnace and enter the high-temperature zone to open or close the door, posing safety hazards and causing discomfort due to the high temperature, thus affecting operational convenience. Furthermore, the electrical components controlling the traction mechanism are constantly exposed to high temperatures, making them prone to aging and damage, increasing maintenance costs and failure rates.

[0004] Furthermore, since the furnace feed inlet is at a certain height from the ground, an additional ramp is usually needed in front of the furnace to facilitate the pusher rake pushing the aluminum material to the feed inlet. However, the ramp not only occupies extra space, but also requires frequent adjustments and maintenance by staff during actual use, further increasing the labor intensity and difficulty of the work.

[0005] It is evident that existing technologies still need improvement and enhancement. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the purpose of this invention is to provide a furnace door opening and closing mechanism for an aluminum rod production furnace, aiming to at least solve one of the technical problems existing in the prior art.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A furnace door opening and closing mechanism for an aluminum rod production furnace includes a furnace body with a front feeding port, a laterally extending and rotatably mounted flip shaft on the furnace body, a furnace door mounted on the flip shaft for sealing the front feeding port, a gear sleeved on one end of the flip shaft, and a rack vertically slidably connected to the furnace body and meshing with the gear. The furnace door can be flipped open to press against the ground and form an acute angle with the ground. A pit is provided in the ground, and a lever structure is provided in the pit. A support frame is provided on the power arm of the lever structure, and a roller assembly is provided on the top of the support frame. The roller assembly supports a lifting pedal for supporting a forklift. The resistance arm of the lever structure pulls the gear downward through a zipper structure. A first reset mechanism is provided on the furnace body to pull the rack upward.

[0009] As a further improvement to the above technical solution, the lever structure includes a fulcrum seat set in the pit, a lever that swings left and right around the fulcrum seat, a support frame set on the power arm of the lever, and the support frame includes a frame body fixed on the power arm of the lever and a triangular frame fixed to the top of the frame body. The roller assembly is rotatably sleeved on the top beam of the triangular frame.

[0010] As a further improvement to the above technical solution, the pit is provided with a second reset mechanism that swings the resistance arm of the lever downward, so that when the furnace door is closed, the lever remains balanced left and right or the height of the resistance arm of the lever is lower than the height of the power arm.

[0011] As a further improvement to the above technical solution, the bottom of the lifting pedal is provided with an outward-facing guide wheel, and the inner wall of the pit is provided with a guide rail that cooperates with the guide wheel, the guide rail extending vertically.

[0012] As a further improvement to the above technical solution, a raised ramp located in front of the front edge of the pit and two side seats located on both sides of the pit are provided on the ground. The guide rail extends upward to the side seats. When the furnace door is closed, the top surface of the lifting pedal is flush with the top surface of the side seats. When the furnace door is fully opened, the top surface of the lifting pedal is flush with the ground.

[0013] As a further improvement to the above technical solution, a storage cavity is provided on the inner wall of the side seat, and a bearing seat is provided on the top of the side seat. The bearing seat is rotatably connected to a rotating shaft that extends vertically into the storage cavity. A limiting arm is fixedly connected to the bottom end of the rotating shaft. The limiting arm can rotate out of the storage cavity to limit the rise of the lifting pedal, or rotate to retract into the storage cavity for storage. A handwheel is provided at the top end of the rotating shaft.

[0014] As a further improvement to the above technical solution, the furnace body is provided with a bending rail for guiding the rack to move vertically. The first reset mechanism includes multiple first tension springs, the top of which is connected to the top of the bending rail and the bottom of which is connected to the top of the rack. The second reset mechanism includes multiple second tension springs. The resistance arm of the lever is provided with a side lug. The bottom of the second tension spring is fixed to the bottom surface of the pit and the top of which is connected to the side lug.

[0015] As a further improvement to the above technical solution, the zipper structure includes a support set on the bottom of the pit, a sprocket rotatably set on the support, and a chain arranged in a U-shape and meshing with the sprocket. One end of the chain is connected to the bottom of the rack, and the other end is connected to the resistance arm of the lever.

[0016] As a further improvement to the above technical solution, the outer side of the furnace door is provided with an inner plate and a reinforcing rib grid on the outer end face of the inner plate. A chamfer is formed on the front edge of the inner plate that abuts against the ground, and baffle protrusions are formed on both sides of the inner plate.

[0017] As a further improvement to the above technical solution, a buffer pad is provided on the bottom surface of the pit for the power arm of the buffer lever to impact the pit.

[0018] The beneficial effects of the present invention: The furnace door opening and closing mechanism of the aluminum rod production furnace provided by the present invention has the following advantages: 1. The mechanism automatically opens and closes the furnace door by applying pressure with the weight of the forklift to trigger the lever linkage gear. The operator does not need to approach the high temperature area of ​​the furnace body to operate, avoiding the risk of high temperature burns, reducing physical discomfort caused by high temperature environment, and significantly improving the safety and comfort of operation.

[0019] 2. By using the forklift's own weight as a power source, no additional electric or hydraulic drive device is required. The entire opening and closing process adopts a purely mechanical structure linkage, without relying on electronic control components. This fundamentally solves the problem of electronic control mechanisms being prone to aging and damage due to high temperatures in existing technologies, significantly reducing equipment maintenance costs and failure rates, and improving the stability and service life of the mechanism.

[0020] 3. When the furnace door is opened, it can directly press against the ground to form an acute-angle ramp, replacing the additional ramp frame set in the existing technology. This not only saves production space, but also eliminates the need for staff to adjust and maintain the ramp frame, reducing labor intensity, simplifying the feeding operation process, and improving production efficiency.

[0021] 4. The concealed design of the pit and lever structure makes the furnace door opening and closing mechanism flush with the ground, reducing exposed parts of the equipment, optimizing the spatial layout around the furnace, and reducing safety hazards and interference risks caused by exposed parts. Attached Figure Description

[0022] Figure 1This is a schematic diagram of the structure of the furnace door opening and closing mechanism provided by the present invention, which drives the furnace door to open.

[0023] Figure 2 An external perspective view of the furnace door opening and closing mechanism provided by the present invention, which drives the furnace door to open.

[0024] Figure 3 This is a schematic diagram of the forklift just moving to the lifting pedal.

[0025] Figure 4 This is a diagram illustrating how the lifting pedal of a forklift is triggered to lower.

[0026] Key component symbols: 1-furnace body, 11-front feeding port, 21-tilting shaft, 22-furnace door, 221-inner plate, 222-baffle protrusion, 31-gear, 32-rack, 33-first reset mechanism, 34-bending rail, 41-pit, 42-elevation ramp, 43-side seat, 44-storage cavity, 45-buffer pad, 46-cover plate, 51-upright frame, 511-frame, 51 2-Triangle frame, 52-Roller assembly, 53-Lifting pedal, 54-Guide wheel, 55-Guide rail, 6-Lever structure, 61-Fulcrum seat, 62-Lever, 621-Power arm, 622-Resistance arm, 64-Second reset mechanism, 7-Zipper structure, 71-Support, 72-Sprocket, 73-Chain, 81-Bearing seat, 82-Shaft, 83-Limit arm, 84-Handwheel, 9-Forklift. Detailed Implementation

[0027] This invention provides a furnace door opening and closing mechanism for an aluminum rod production furnace. To make the objectives, technical solutions, and effects of this invention clearer and more explicit, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the scope of protection of the invention.

[0028] Please see Figures 1 to 4This invention provides a furnace door opening and closing mechanism for an aluminum rod production furnace, comprising a furnace body 1 having a front feeding port 11, a laterally extending and rotatably mounted flip shaft 21 on the furnace body 1, a furnace door 22 mounted on the flip shaft 21 for sealing the front feeding port 11, a gear 31 sleeved on one end of the flip shaft 21, and a rack 32 vertically slidably connected to the furnace body 1 and meshing with the gear 31. The furnace door 22 can be flipped open to press against the ground and form an acute angle with the ground. A pit 41 is provided in the ground, and a lever structure 6 is provided in the pit 41. A support frame 51 is provided on the power arm 621 of the lever structure 6, and a roller assembly 52 is provided on the top of the support frame 51. The roller assembly 52 supports a lifting pedal 53 for supporting a forklift 9. The resistance arm 622 of the lever structure 6 pulls the gear 31 downward through a zipper structure 7. A first reset mechanism 33 is provided on the furnace body 1 to pull the rack 32 upward.

[0029] The specific working process is as follows: When the forklift 9 needs to feed material into the furnace, the forklift 9 travels to the lifting pedal 53. The weight of the forklift 9 applies downward pressure to the roller assembly 52 through the lifting pedal 53, causing the lifting pedal 53 to move downward. This drives the upright frame 51 to move the power arm 621 of the lever structure 6 downward. The lever structure 6 rotates around the fulcrum, causing the resistance arm 622 to lift upward. Then, the resistance arm 622 pulls the rack 32 downward through the zipper structure 7. Since the gear 31 meshes with the rack 32, when the rack 32 moves downward, it drives the gear 31 to rotate, which in turn drives the tilting shaft 21 to rotate, causing the furnace door 22 to tilt forward and open around the tilting shaft 21. When the furnace door 22 tilts to the ground, it forms an acute angle with the ground. At this time, the furnace door 22 itself forms a temporary ramp structure. The forklift 9 cleverly uses the furnace door 22 to push the pusher rake and material directly to the front feeding port 11 of the furnace.

[0030] After feeding is completed, the forklift 9 moves away from the lifting pedal 53, and the power arm 621 of the lever structure 6 loses pressure. Under the action of the first reset mechanism 33, the rack 32 is pulled upward, and the rack 32 drives the gear 31 to rotate in the opposite direction. The flipping shaft 21 rotates in the opposite direction, and the furnace door 22 flips backward to reset, re-sealing the front feeding port 11 of the furnace body 1. At the same time, the resistance arm 622 of the zipper structure 7 lever 62 falls back to the initial state, so that the power arm 621 of the lever 62 drives the lifting pedal 53 to move upward to achieve reset.

[0031] It should be understood that since the high-temperature combustion inside the furnace requires oxygen to enter the furnace door 22, the furnace door 22 does not actually need to be tightly sealed at the front feeding port 11, that is, an air-permeable gap is formed between the edge of the furnace door and the front feeding port 11.

[0032] The furnace door opening and closing mechanism of the aluminum rod production furnace provided by the present invention has the following advantages: 1. The mechanism automatically opens and closes the furnace door 22 by applying pressure from the weight of the forklift 9 to trigger the lever 62 and the gear 31. The operator does not need to approach the high temperature area of ​​the furnace body 1 to operate, avoiding the risk of high temperature burns, reducing physical discomfort caused by high temperature environment, and significantly improving the safety and comfort of operation.

[0033] 2. Utilizing the self-weight of the forklift 9 during operation as a power source, no additional electric or hydraulic drive device is required. The entire opening and closing process adopts a purely mechanical structure linkage, without relying on electronic control components. This fundamentally solves the problem of easy aging and damage of the electronic control mechanism due to high temperature in existing technologies, greatly reducing the maintenance cost and failure rate of the equipment, and improving the stability and service life of the mechanism.

[0034] 3. When the furnace door 22 is opened, it can directly press against the ground to form an acute-angle slope, which replaces the additional ramp frame set in the existing technology. This not only saves production space, but also saves the staff from adjusting and maintaining the ramp frame, reduces labor intensity, simplifies the feeding operation process, and improves production efficiency.

[0035] 4. The concealed design of the pit 41 and lever structure 6 makes the furnace door opening and closing mechanism flush with the ground, reducing exposed parts of the equipment, optimizing the spatial layout around the furnace, and reducing safety hazards and interference risks caused by exposed parts.

[0036] Specifically, the lever structure 6 includes a fulcrum 61 set in the pit 41 and a lever 62 that swings left and right around the fulcrum 61. The upright frame 51 is set on the power arm 621 of the lever 62. The upright frame 51 includes a frame body 511 fixed to the power arm 621 of the lever 62 and a triangular frame 512 fixed to the top of the frame body 511. This design not only enhances the connection strength between the upright frame 51 and the lever 62, but also allows the pressure applied by the forklift 9 to the roller assembly 52 to be transmitted more evenly to the power arm 621 of the lever 62, reducing local stress concentration, improving force transmission efficiency, and ensuring that the lever 62 can flexibly and smoothly drive the subsequent structural movements. The roller assembly 52 is rotatably fitted onto the top beam of the triangular frame 512. The triangular frame 512 has good mechanical properties and can evenly distribute the force on the roller assembly 52 to the frame body 511 and the lever 62, effectively resisting deformation caused by external forces and improving the support stability of the top of the upright frame 51. When the lifting pedal 53 of the forklift 9 contacts and applies pressure to the roller assembly 52, the roller assembly 52 can rotate with the movement or lifting of the forklift 9, adaptively changing the support position, converting sliding friction into rolling friction, and greatly reducing the frictional resistance between the two.

[0037] Furthermore, the pit 41 is equipped with a second reset mechanism 64 that swings the resistance arm 622 of the lever 62 downwards, so that when the furnace door 22 is closed, the lever 62 remains balanced left and right or the height of the resistance arm 622 of the lever 62 is lower than the height of the power arm 621. When the furnace door 22 is closed, the second reset mechanism 64 uses pulling force to keep the lever 62 balanced or the resistance arm 622 lower. At this time, the rack 32 is in the upper position under the action of the first reset mechanism 33, and the meshing state of the gear 31 and the rack 32 is more stable, thereby ensuring that the furnace door 22 fits tightly against the front feeding port 11. This stable force state can prevent gaps from forming in the furnace door 22 due to the shaking of the lever 62, reduce the leakage of heat and flue gas in the furnace, ensure energy utilization efficiency, and reduce thermal pollution to the surrounding environment.

[0038] When lever 62 remains balanced or resistance arm 622 is lower when furnace door 22 is closed, its power arm 621 is in a relatively high position, providing more reasonable travel space for forklift 9 to press down lifting pedal 53. Of course, the pulling force provided by the second reset mechanism 64 can buffer the swing speed of lever 62 to a certain extent, reducing the impact force caused by excessively fast swing of lever 62.

[0039] Preferably, the bottom of the lifting pedal 53 is provided with an outward-facing guide wheel 54, and the inner wall of the pit 41 is provided with a guide rail 55 that cooperates with the guide wheel 54, the guide rail 55 extending vertically. The cooperation between the guide wheel 54 and the vertical guide rail 55 forms a rigid guiding constraint, which can strictly limit the movement direction of the lifting pedal 53, ensuring that it only moves vertically up and down, avoiding lateral deviation or tilting caused by uneven pressure from the forklift 9 or vibration of the mechanism. This precise trajectory control can ensure that the pressure of the pedal on the support roller assembly 52 always acts vertically on the upright frame 51, reducing the force dispersion loss, making the power transmission of the lever structure 6 more direct and efficient, and further improving the synchronization and accuracy of the opening and closing action of the furnace door 22.

[0040] In a preferred embodiment, the ground is provided with an elevated ramp 42 located in front of the front edge of the pit 41, and two side seats 43 located on both sides of the pit 41. The guide rail 55 extends upward to the side seats 43. When the furnace door 22 is closed, the top surface of the lifting pedal 53 is flush with the top surface of the side seats 43. When the furnace door 22 is fully open, the top surface of the lifting pedal 53 is flush with the ground. The elevated ramp 42 is designed to match the lifting pedal 53 being higher than the ground when the furnace door 22 is closed. When the forklift 9 drives from the ground onto the lifting pedal 53 via the elevated ramp 42, a smooth height transition is achieved, avoiding the impact and jamming caused by step-like height differences, allowing the forklift 9 to easily enter the operating position. When the furnace door 22 is fully open, the lifting pedal 53 is flush with the ground, and the forklift 9 can drive away smoothly without additional climbing or descending operations. The entire entry and exit process is smooth and efficient, significantly reducing the dwell time of the forklift 9 in front of the furnace and improving the feeding rhythm.

[0041] Furthermore, a storage cavity 44 is provided on the inner wall of the side seat 43. A bearing seat 81 is provided on the top of the side seat 43. The bearing seat 81 is rotatably connected to a vertically penetrating shaft 82 that extends into the storage cavity 44. A limiting arm 83 is fixedly connected to the bottom end of the shaft 82. The limiting arm 83 can rotate out of the storage cavity 44 to restrict the lifting pedal 53 from rising, or rotate to retract into the storage cavity 44 for storage. A handwheel 84 is provided at the top of the shaft 82. When the forklift 9 triggers the lever structure 6 to open the furnace door 22 via the lifting pedal 53, the operator does not need to wait for the feeding to be completed. They can get off the forklift and turn the handwheel 84 to allow the limiting arm 83 to swing out of the storage cavity 44 and restrict the lifting pedal 53 from rising. At this time, the forklift 9 can immediately drive away from the lifting pedal 53 and flexibly engage in other transportation, feeding, or auxiliary work without having to remain on the pedal to keep the furnace door 22 open. This design significantly reduces the ineffective waiting time of the forklift 9, especially in scenarios with multiple furnaces working together or heavy material transportation tasks, it can significantly improve the turnover efficiency of the forklift 9 and optimize the overall production scheduling.

[0042] To better guide the movement of the rack 32, the furnace body 1 is equipped with a bent rail 34 to guide the vertical movement of the rack 32. The bent rail 34 provides precise guidance for the vertical movement of the rack 32, strictly limiting its trajectory and preventing it from deviating, wobbling, or jamming during its up-and-down movement. This stable guiding effect ensures that the rack 32 and gear 31 maintain a good meshing state at all times, reducing power transmission losses or component wear caused by poor meshing. This makes the opening and closing of the furnace door 22 smoother and more precise, improving the reliability and service life of the entire transmission mechanism.

[0043] Specifically, the first reset mechanism 33 includes multiple first tension springs. The top of each first tension spring is connected to the top of the bending rail 34, and the bottom is connected to the top of the rack 32. When the furnace door 22 needs to be closed, the tension of the first tension springs can efficiently pull the rack 32 upward. The arrangement of multiple tension springs can evenly distribute the tension, preventing uneven force on the rack 32 and ensuring that the rack 32 rises smoothly. This, in turn, drives the gear 31 and the tilting shaft 21 to rotate in the opposite direction, so that the furnace door 22 is accurately reset and tightly seals the front feeding port 11. At the same time, the first tension springs have good elastic recovery performance, can adapt to multiple reciprocating movements, have a rapid reset response, and are simple in structure and easy to maintain. Compared with other reset methods, they are more adaptable to the high-temperature environment around the furnace.

[0044] Furthermore, the second reset mechanism 64 includes multiple second tension springs. The resistance arm 622 of the lever 62 has a side lug. The bottom end of the second tension spring is fixed to the bottom surface of the pit 41, and the top end is connected to the side lug. Its tension effectively pulls the resistance arm 622 of the lever 62 downwards, ensuring that the lever 62 remains balanced left and right when the furnace door 22 is closed, or that the height of the resistance arm 622 is lower than the height of the power arm 621. This force state not only provides reliable assurance for the stable state of the furnace door 22 after it is closed, preventing the furnace door 22 from accidentally opening due to lever 62 imbalance, but also provides reasonable initial force conditions for the forklift 9 to trigger the next time the furnace door 22 is opened, ensuring that the lever 62 can respond sensitively to the pressure of the forklift 9, and improving the continuity and stability of the mechanism's operation. In addition, the multiple second tension springs can evenly distribute the tension, reducing the load on a single tension spring and extending its service life.

[0045] Specifically, the zipper structure 7 includes a support 71 mounted on the bottom of the pit 41, a sprocket 72 rotatably mounted on the support 71, and a U-shaped chain 73 meshing with the sprocket 72. One end of the chain 73 is connected to the bottom of the rack 32, and the other end is connected to the resistance arm 622 of the lever 62. The chain 73 and sprocket 72 themselves have strong high-temperature resistance, maintaining good mechanical properties in the high-temperature environment around the furnace, and will not deform, jam, or fail due to high temperatures. This solves the problem of traditional transmission components being easily damaged in high-temperature environments, ensuring that the zipper structure 7 stably transmits power during long-term continuous production, providing reliable protection for the normal opening and closing of the furnace door 22, and reducing production interruptions caused by transmission component failure. The chain 73 and sprocket 72 have high load-bearing capacity, effectively withstanding the large tensile force transmitted by the resistance arm 622 of the lever 62 and the weight of the rack 32. When the forklift 9 triggers the lever structure 6 to drive the chain 73, the meshing transmission between the chain 73 and the sprocket 72 can stably transmit force to the rack 32, ensuring that the rack 32 moves smoothly downward to open the furnace door 22. Even if a large instantaneous impact occurs during the feeding process, this structure can withstand and stabilize the transmission, avoiding damage due to overload, and improving the durability and safety of the mechanism.

[0046] In this embodiment, the outer side of the furnace door 22 is provided with an inner plate 221 and reinforcing ribs on the outer end face of the inner plate 221. A chamfer is formed on the front edge of the inner plate 221 that abuts against the ground, and baffle protrusions 222 are formed on both sides of the inner plate 221. The inner plate 221 serves as the basic load-bearing structure of the furnace door 22, providing a stable support frame. The reinforcing ribs, located on the outer end face of the inner plate 221, effectively disperse the pressure and impact force on the furnace door 22 during opening and closing through a grid-like distribution of ribs. Especially when the furnace door 22 is flipped open and presses against the ground, it prevents the inner plate 221 from deforming or breaking due to excessive localized stress. This reinforced design significantly improves the overall structural strength and fatigue resistance of the furnace door 22, extends its service life, and meets the high-intensity usage requirements of long-term continuous furnace production.

[0047] The front edge of the inner plate 221 that abuts against the ground is chamfered. When the furnace door 22 is opened and forms an acute-angle ramp with the ground, the chamfered structure guides the aluminum material (such as scrap aluminum or aluminum ingots) to slide smoothly along the surface of the inner plate 221 into the front feeding port 11 of the furnace, preventing the aluminum material from getting stuck or piling up at the edge. At the same time, the baffle protrusions 222 formed on both sides of the inner plate 221 can laterally limit the aluminum material, preventing it from sliding off the sides of the furnace door 22 during the pushing process. This ensures that the aluminum material accurately enters the feeding port, reduces material waste and cleaning work, and improves the convenience and efficiency of the feeding operation.

[0048] Preferably, the bottom surface of the pit 41 is provided with a buffer pad 45 for the impact of the power arm 621 of the buffer lever 62 against the pit 41. During the opening of the furnace door 22, the power arm 621 of the lever 62 swings downwards under the pressure of the forklift 9. The buffer pad 45 effectively absorbs the impact force when the power arm 621 swings to its lowest point, preventing a direct hard collision between the power arm 621 and the bottom surface of the pit 41. This reduces mechanical damage to the power arm 621 and connecting components such as the fulcrum 61 caused by impact, reduces fatigue wear of components, significantly extends the service life of the lever structure 6, and ensures its long-term stable participation in the opening and closing of the furnace door 22.

[0049] In practical applications, a cover plate 46 flush with the ground is provided above the resistance arm 622 of the zipper structure 7 and the lever 62. This design prevents personnel or forklifts 9 from accidentally stepping on the zipper structure 7 or the lever 62 while working in front of the furnace, thus preventing damage to the mechanism or the risk of personnel tripping or falling due to accidental stress on the components. In addition, the flush cover plate 46 keeps the ground flat, preventing depressions or bumps, ensuring smoother movement of equipment such as forklifts 9 and pushers in the furnace area, reducing safety accidents such as equipment bumps or material drops caused by uneven ground, and providing a safer working environment for production operations.

[0050] 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," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are 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.

[0051] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0052] It is understood that those skilled in the art can make equivalent substitutions or changes to the technical solution and inventive concept of the present invention, and all such changes or substitutions should fall within the protection scope of the present invention.

Claims

1. A furnace door opening and closing mechanism for an aluminum rod production furnace, characterized in that, The furnace includes a furnace body with a front feeding port, a laterally extending and rotatably mounted tilting shaft on the furnace body, a furnace door mounted on the tilting shaft for sealing the front feeding port, a gear sleeved on one end of the tilting shaft, and a rack vertically slidably connected to the furnace body and meshing with the gear. The furnace door can be tilted forward and opened to press against the ground, forming an acute angle with the ground. A pit is provided in the ground, and a lever structure is provided in the pit. A support frame is provided on the power arm of the lever structure, and a roller assembly is provided on the top of the support frame. The roller assembly supports a lifting pedal for supporting a forklift. The resistance arm of the lever structure pulls the gear downward through a zipper structure. A first reset mechanism is provided on the furnace body to pull the rack upward.

2. The furnace door opening and closing mechanism of the aluminum rod production furnace according to claim 1, characterized in that, The lever structure includes a fulcrum seat set in the pit and a lever that swings left and right around the fulcrum seat. The upright is set on the power arm of the lever. The upright includes a frame fixed to the power arm of the lever and a triangular frame fixed to the top of the frame. The roller assembly is rotatably fitted onto the top beam of the triangular frame.

3. The furnace door opening and closing mechanism of the aluminum rod production furnace according to claim 2, characterized in that, The pit is equipped with a second reset mechanism that swings the resistance arm of the lever downwards, so that when the furnace door is closed, the lever remains balanced left and right or the height of the resistance arm of the lever is lower than the height of the power arm.

4. The furnace door opening and closing mechanism of the aluminum rod production furnace according to claim 1, characterized in that, The bottom of the lifting pedal is provided with an outward-facing guide wheel, and the inner wall of the pit is provided with a guide rail that cooperates with the guide wheel, and the guide rail extends vertically.

5. The furnace door opening and closing mechanism of the aluminum rod production furnace according to claim 4, characterized in that, The ground is provided with a raised ramp in front of the front edge of the pit and two side seats on both sides of the pit. The guide rail extends upward to the side seats. When the furnace door is closed, the top surface of the lifting pedal is flush with the top surface of the side seat. When the furnace door is fully opened, the top surface of the lifting pedal is flush with the ground.

6. The furnace door opening and closing mechanism of the aluminum rod production furnace according to claim 5, characterized in that, The inner wall of the side seat is provided with a storage cavity. The top of the side seat is provided with a bearing seat. The bearing seat is rotatably connected to a rotating shaft that extends vertically into the storage cavity. The bottom end of the rotating shaft is fixedly connected to a limiting arm. The limiting arm can rotate out of the storage cavity to limit the rise of the lifting pedal, or rotate to retract into the storage cavity for storage. The top end of the rotating shaft is provided with a handwheel.

7. The furnace door opening and closing mechanism of the aluminum rod production furnace according to claim 3, characterized in that, The furnace body is provided with a bending rail for guiding the rack to move vertically. The first reset mechanism includes multiple first tension springs, the top of which is connected to the top of the bending rail and the bottom of which is connected to the top of the rack. The second reset mechanism includes multiple second tension springs. The resistance arm of the lever is provided with a side lug. The bottom of the second tension spring is fixed to the bottom surface of the pit and the top of which is connected to the side lug.

8. The furnace door opening and closing mechanism of the aluminum rod production furnace according to claim 1, characterized in that, The zipper structure includes a support set on the bottom of the pit, a sprocket rotatably set on the support, and a chain arranged in a U-shape and meshing with the sprocket. One end of the chain is connected to the bottom of the rack, and the other end is connected to the resistance arm of the lever.

9. The furnace door opening and closing mechanism of the aluminum rod production furnace according to claim 1, characterized in that, The outer side of the furnace door is provided with an inner plate and a reinforcing rib grid on the outer end face of the inner plate. A chamfer is formed on the front edge of the inner plate that abuts against the ground, and baffle protrusions are formed on both sides of the inner plate.

10. The furnace door opening and closing mechanism of the aluminum rod production furnace according to claim 1, characterized in that, The bottom surface of the pit is equipped with a buffer pad for the power arm of the buffer lever to impact the pit.

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