A stirring device for an aluminum alloy melting furnace

Abstract

The application relates to the technical field of aluminum alloy melting and casting, in particular to an aluminum alloy melting and casting furnace stirring device, which comprises a base, a rack arranged on the base, a sliding frame sliding along the vertical direction of the rack, a lifting mechanism arranged on the rack and connected with the sliding frame, a heat preservation cover arranged on the sliding frame and used for covering the melting and casting furnace, a middle part of the heat preservation cover being provided with a penetrating hole, a stirring mechanism sliding on the sliding frame along the vertical direction, a stirring shaft penetrating through the penetrating hole, and a lifting mechanism arranged on the sliding frame and connected with the stirring mechanism and used for driving the stirring mechanism to lift. The application can effectively inhibit heat loss.

Description

Technical Field

[0001] This application relates to the technical field of aluminum alloy casting, and in particular to a stirring device for an aluminum alloy casting furnace. Background Technology

[0002] Currently, in the aluminum alloy casting process, degassing of molten aluminum is a crucial step in improving casting quality. This typically involves introducing an inert gas (such as nitrogen or argon) into the molten aluminum and mechanically agitating it to disperse it into tiny bubbles. These bubbles adsorb and remove hydrogen and oxide inclusions from the molten aluminum, thus purifying it. This process places high demands on the stability, adjustability, and sealing of the agitation device.

[0003] In the prior art, such as the degassing machine for an aluminum alloy wheel hub melting furnace disclosed in Chinese patent application CN108866351A, components include a frame, motor, belt drive system, bearing housing, drive shaft, and graphite stirring rod. This device adjusts the stirring rod up and down via an adjusting screw to accommodate different liquid levels, offering a degree of adjustability and ease of maintenance. However, this device results in a large exposed surface area of ​​the molten aluminum during stirring, leading to significant heat loss, and the molten aluminum is prone to splashing during stirring, posing certain safety hazards. Utility Model Content

[0004] This application provides a stirring device for an aluminum alloy melting and casting furnace, which can at least partially solve the above-mentioned technical problems.

[0005] This application provides a stirring device for an aluminum alloy melting and casting furnace, which adopts the following technical solution: A stirring device for an aluminum alloy melting and casting furnace includes: a base, a frame mounted on the base, a sliding frame that slides vertically along the frame, and a lifting mechanism mounted on the frame and connected to the sliding frame; further comprising: A heat-insulating cover is provided on the sliding frame and is used to cover the melting furnace. A through hole is provided in the middle. The stirring mechanism slides vertically on the sliding frame, with the stirring shaft passing through the through hole; A lifting mechanism is mounted on the sliding frame and connected to the stirring mechanism, used to drive the stirring mechanism to lift and lower.

[0006] By adopting the above technical solution, during operation, the device is moved above the melting furnace, and the heat preservation cover is placed on the furnace opening. The overall height of the sliding frame is adjusted by the lifting mechanism on the frame to initially position the heat preservation cover. Then, the lifting mechanism on the sliding frame is started to drive the stirring mechanism (including the stirring shaft) to perform fine lifting and lowering movements in the vertical direction, so that the stirring shaft passes through the through hole of the heat preservation cover and penetrates into the aluminum liquid to the required depth, and begins to rotate to perform degassing and stirring operations.

[0007] The lifting mechanism enables coarse adjustment of the relative position between the insulation cover and the furnace body, while the lifting mechanism itself enables fine adjustment of the insertion depth of the stirring shaft. This separate design allows for fine adjustment of the stirring depth without altering the sealing state between the insulation cover and the furnace body, making operation more flexible and precise.

[0008] The core function of the heat preservation cover is to cover the furnace opening, which greatly reduces the contact area between the aluminum liquid surface and the air and the heat radiation area, effectively suppressing heat loss (solving the defect of "heat leakage and poor heat preservation effect" in the background technology), saving energy and reducing consumption; at the same time, the cover can prevent aluminum liquid from splashing during stirring, improving operational safety.

[0009] The stirring mechanism is integrated into the sliding frame and can be raised and lowered together with the heat preservation cover. The overall structure is clear and easy to maintain.

[0010] Optionally, a scraper is provided on the side of the heat-insulating cover away from the stirring mechanism, and the scraper abuts against the stirring shaft of the stirring mechanism.

[0011] By adopting the above technical solution, when the stirring operation is completed, the lifting mechanism raises the stirring shaft to pull it out of the molten aluminum and retracts it through the insulation cover. At the same time, the scraper fixed on the stirring shaft will rise accordingly. Since the scraper is in contact with the stirring shaft, it will scrape the lower surface of the insulation cover and remove the molten aluminum adhering to the surface. This effectively solves the problem that high-temperature molten aluminum easily adheres to the lower surface of the insulation cover and forms slag that is difficult to clean after cooling. It keeps the lower surface of the insulation cover clean and ensures its heat insulation effect and sealing for subsequent use.

[0012] The scraped-back molten aluminum drips back into the furnace, reducing metal loss. At the same time, automated cleaning reduces the labor intensity of workers and the risks of manual cleaning at high temperatures.

[0013] Optionally, the lifting mechanism may employ one of the following structures: hydraulic cylinder, pneumatic cylinder, sprocket and chain structure, or screw and nut structure.

[0014] By adopting the above technical solution, the insertion depth and lifting speed of the stirring shaft can be precisely controlled through mechanical drive, which is far superior to the manual adjustment screw method in the background technology, and facilitates the realization of automated control; the screw drive has a self-locking characteristic and can be stably stopped at any position, ensuring a constant stirring depth and preventing it from sinking or floating on its own due to vibration or other reasons, making the operation more reliable.

[0015] Optionally, the stirring shaft of the stirring mechanism is provided with an open insertion groove, and the heat preservation cover is provided with a snap-fit ​​mechanism. The snap-fit ​​mechanism includes a limiting rod and an adjusting component. The limiting rod slides on the heat preservation cover and can be inserted into the insertion groove.

[0016] By adopting the above technical solution, when maintenance or replacement of the stirring shaft is required, the stirring shaft is raised to its highest position, at which point its insertion slot aligns with the locking mechanism on the insulation cover (which should be the insulation cover). The operator adjusts the component to allow the limiting rod to slide horizontally and insert into the insertion slot of the stirring shaft, thereby temporarily locking the stirring shaft in its highest position. This provides a mechanical safety locking function, preventing the stirring mechanism from accidentally falling during maintenance, ensuring operator safety, and making maintenance work (such as replacing the stirring rod) more convenient and faster. The engagement between the insertion slot and the limiting rod is simple, reliable, easy to manufacture and implement, and can reduce the movement of the stirring mechanism due to misoperation, reducing human or equipment damage and improving safety.

[0017] Optionally, the adjusting assembly includes a spring and a reset member. The spring is disposed on the heat preservation cover and is connected to the limiting rod, which drives the limiting rod to approach the stirring shaft of the stirring mechanism. The reset member is disposed on the side wall of the heat preservation cover near the sliding frame and can drive the limiting rod to slide.

[0018] By adopting the above technical solution, under natural conditions, the spring force pushes the limiting rod to always tend to move towards the stirring shaft, providing a ready state for automatic alignment and locking. When it is necessary to unlock, the reset component (such as pressing or pulling) is operated to overcome the spring force, causing the limiting rod to exit from the insertion slot. The spring ensures that the locking mechanism is in the ready-to-lock position when not in use, improving the response speed and convenience of the equipment. The independent reset component makes the unlocking operation simple and effortless. This forms a safe locking mechanism with an automatic reset function, which not only ensures the reliability of locking but also makes the unlocking operation easy and convenient.

[0019] Optionally, the limiting rod is provided with a driving groove, and the reset component includes a reset rod. The reset rod slides vertically on the heat preservation cover. The reset rod cooperates with the driving groove. When the reset rod is pressed down, the limiting rod moves away from the stirring shaft of the stirring mechanism.

[0020] By adopting the above technical solution, when unlocking is required, the operator presses down on the reset rod. The lower end of the reset rod inserts into the drive groove. Since the drive groove is inclined, the downward vertical force is converted into a component force that moves the limit rod horizontally outward, thereby overcoming the spring force and pulling the limit rod out of the insertion groove, thus achieving unlocking. The inclined surface (drive groove) converts the small vertical downward force into a large horizontal pulling force, making the unlocking operation very labor-saving. Integrating the unlocking action in the vertical direction is coordinated with the overall layout of the equipment and requires little operating space. The labor-saving unlocking structure is suitable for use in high-temperature environments or environments where gloves are required, improving human-machine efficiency.

[0021] Optionally, the heat insulation cover has a locking pin that slides vertically, and the limiting rod has a corresponding locking groove. When the limiting rod and the insertion groove are engaged, the locking pin is inserted into the locking groove.

[0022] By adopting the above technical solution, after the limit rod is successfully inserted into the insertion slot, the locking pin is manually or automatically pushed into the locking groove on the limit rod. The locking pin locks the limit rod vertically, preventing it from slipping due to vibration or accidental contact with the reset component, providing double insurance. This adds a second locking defense line, greatly improving the reliability and safety of the locking state, eliminating the possibility of the stirring shaft falling due to equipment vibration or misoperation, enhancing stability, and making the locking state more secure. This forms a composite safety locking system with a main lock (limit rod), labor-saving unlocking (reset insertion rod + drive groove), and a secondary lock (locking pin), providing extremely high safety.

[0023] Optionally, the heat-insulating cover is provided with a driving assembly, which includes a driving ring, a driving block, a return spring, and a wedge. The driving ring rotates on the heat-insulating cover. The driving block is disposed on the driving ring and has a wedge surface that corresponds to and abuts against the return rod. The return spring is disposed on the heat-insulating cover and is connected to the return rod, driving the limit rod closer to the sliding frame. The wedge is disposed on the driving ring and can cooperate with the locking pin. As the wedge slides, it drives the locking pin to be pulled out of the locking groove.

[0024] By adopting the above technical solution, when unlocking is required, the drive ring is rotated, and the wedge block on the drive ring also rotates accordingly. Its inclined surface acts on the locking pin, pushing the locking pin out of the locking groove, thereby releasing the secondary lock. Then, the drive ring drives the drive block on it to rotate, and the wedge surface of the drive block presses down on the reset rod, achieving effortless unlocking. The main lock (by the drive block pressing down on the reset rod) and the secondary lock (by the wedge block pushing out the locking pin) are released through a single rotation action, greatly simplifying the operation process and making it highly efficient. It avoids the trouble of having to perform two independent operations, reduces operation time, and achieves a perfect combination of extremely high security and extremely high operational convenience.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. The core function of the heat preservation cover is to cover the furnace opening, which greatly reduces the contact area between the aluminum liquid surface and the air and the heat radiation area, effectively suppressing heat loss (solving the defect of "heat leakage and poor heat preservation effect" in the background technology), saving energy and reducing consumption; at the same time, the cover can prevent aluminum liquid from splashing during stirring, improving operational safety. 2. The unlocking action is integrated in the vertical direction, which is coordinated with the overall layout of the equipment and requires little operating space; the labor-saving unlocking structure is suitable for use in high-temperature environments or environments where gloves are required, thus improving human-machine efficiency. 3. The main lock (by pressing down the reset rod with the drive block) and the secondary lock (by pushing out the lock stop pin with the wedge block) are released with a single rotation action, greatly simplifying the operation process and making it highly efficient; it avoids the trouble of having to perform two independent operations and reduces operation time; it achieves a perfect combination of extremely high security and extremely high ease of operation. Attached Figure Description

[0026] Figure 1 This is an overall structural diagram of the stirring device in the embodiments of this application; Figure 2 This is a diagram illustrating the driving component in an embodiment of this application; Figure 3 This is a cross-sectional view of the stirring shaft in an embodiment of this application.

[0027] Reference numerals: 100, base; 200, frame; 300, sliding frame; 400, lifting mechanism; 410, lifting motor; 420, lifting screw; 430, lifting slider; 500, insulation cover; 510, through hole; 600, stirring mechanism; 610, stirring shaft; 611, insertion slot; 620, drive motor; 630, stirring wheel; 710, lifting mechanism; 720, mounting bracket; 800, scraper; 900, snap-fit ​​mechanism; 910, limit rod; 911, drive slot; 912, locking slot; 920, adjusting assembly; 921, spring; 922, reset component; 930, locking pin; 940, drive assembly; 941, drive ring; 942, drive block; 943, reset spring; 944, wedge block; 945, wedge surface. Detailed Implementation

[0028] The following combination Figures 1 to 3 This application will be described in further detail.

[0029] This embodiment provides a stirring device for an aluminum alloy casting furnace. Its core is to solve the problems of heat loss and splashing by using an insulating cover 500 that can cover the furnace opening, and to achieve safe, precise and convenient operation of the stirring shaft 610 through a lifting and locking system.

[0030] Reference Figure 1 , Figure 2 and Figure 3The device mainly includes a base 100, a frame 200, a sliding frame 300, a lifting mechanism 400, a heat insulation cover 500, a stirring mechanism 600, and a dedicated lifting mechanism 710. The sliding frame 300 is vertically mounted on the frame 200 via the lifting mechanism 400, thereby enabling the heat insulation cover 500 and the stirring mechanism 600 to achieve overall coarse adjustment. The stirring mechanism 600 is precisely positioned on the sliding frame 300 via its own independent lifting mechanism 710, allowing its stirring shaft 610 to pass through the through hole 510 in the center of the heat insulation cover 500 and penetrate into the molten aluminum. In addition, a scraper 800 is provided for cleaning the heat insulation cover 500, and a linkage locking mechanism 900 is provided for safely locking the stirring shaft 610 during maintenance.

[0031] See Figure 1 The specific structure of the aluminum alloy melting and casting furnace stirring device in this embodiment is as follows: The base 100 is placed on the ground, providing a stable foundation for the entire device. Wheels can be installed on the base 100, and counterweights can be installed on the base 100 to reduce the forward tilt of the stirring mechanism 600. The frame 200 is fixedly installed on the base 100, and its main body is a vertical frame structure. The sliding frame 300 is connected to the frame 200 via guide rails or a sliding sleeve structure, allowing the sliding frame 300 to slide downwards along the vertical direction of the frame 200.

[0032] The lifting mechanism 400 is mounted on the frame 200 and is used to drive the sliding frame 300 to perform lifting and lowering movements. The lifting mechanism 400 can take various forms, such as, but not limited to, hydraulic cylinders, pneumatic cylinders, sprocket and chain mechanisms, or screw and nut mechanisms. In this embodiment, the preferred lifting mechanism 400 is an electric push rod or a ball screw pair driven by a servo motor. In this embodiment, a ball screw pair is preferred, including a lifting motor 410, a lifting screw 420, and a lifting slider 430. The lifting motor 410 is fixedly connected to the upper end of the frame 200, the lifting screw 420 is rotatably connected to the frame 200, and the lifting slider 430 is fixedly connected to the sliding frame 300 and threadedly connected to the lifting screw 420. When the lifting motor 410 drives the lifting screw 420 to rotate, the lifting slider 430 slides in the vertical direction, which can drive the entire sliding frame 300 and all its components to rise and fall over a wide range relative to the furnace opening, thereby achieving "coarse adjustment" of the position of the heat preservation cover 500.

[0033] The heat insulation cover 500 is mounted on the lower part of the sliding frame 300 via a bracket or directly fixed. Its shape matches the furnace opening, preferably being circular. The side of the heat insulation cover 500 closest to the furnace is made of heat-insulating material (such as refractory ceramic fiberboard), and may have an embedded refractory layer to reduce heat radiation. A circular through hole 510 is provided in the center of the heat insulation cover 500 for the stirring mechanism 600 to pass through. The function of the heat insulation cover 500 is to cover the furnace opening during stirring operations, greatly reducing heat loss and aluminum molten metal splashing.

[0034] The stirring mechanism 600 is the core component for performing the degassing task. It includes a drive motor 620, a reducer, a transmission shaft, and an end stirring shaft 610. The drive motor 620 is mounted on the upper part of the sliding frame 300. The reducer is connected to the output shaft of the drive motor 620, and the transmission shaft is connected to the stirring shaft 610. The stirring shaft 610 is usually made of high-temperature resistant materials such as graphite and is inserted into the through hole 510. An stirring wheel 630 is installed at the end of the stirring shaft 610. The entire stirring mechanism 600 (i.e., its motor and housing) is not directly fixed to the sliding frame 300, but is connected to the lifting mechanism 710 described below, so that the entire stirring mechanism 600 can be independently raised and lowered within a range, adjusting the stirring depth, separate from the sliding frame 300 and the insulation cover 500.

[0035] A lifting mechanism 710 is mounted on the sliding frame 300 and is used to drive the stirring mechanism 600 to perform precise lifting movements. Specifically, the lifting mechanism 710 can take various forms, such as, but not limited to, hydraulic cylinders, pneumatic cylinders, sprocket and chain mechanisms, or lead screw and nut mechanisms. In this embodiment, the lifting mechanism 710 is preferably a piston device such as a hydraulic cylinder, electric actuator, or pneumatic cylinder. In this embodiment, the lifting mechanism 710 is an electric actuator, which is fixedly mounted on the top of the sliding frame 300. Its piston rod points vertically downwards, and the end of the piston rod is connected to a mounting frame 720. The stirring mechanism 600 is mounted on the mounting frame 720. Therefore, when the electric actuator extends or retracts, it causes the mounting frame 720 to slide, and the mounting frame 720 drives the stirring mechanism 600 and its stirring shaft 610 to perform precise "fine-tuning," controlling the depth to which it is inserted into the molten aluminum.

[0036] A scraper 800 is provided on the lower surface of the insulation cover 500 (i.e., the side away from the motor of the stirring mechanism 600). This scraper 800 is mounted on the insulation cover 500 via two connecting brackets. Two scrapers 800 are provided, and they are arranged in a downward-sloping semi-circular shape. The edges of the scrapers 800 maintain a slight elastic contact or a small gap with the side wall of the stirring shaft 610. When the stirring operation is completed and the stirring shaft 610 rises and retracts, the scrapers 800 scrape the surface of the stirring shaft 610, removing the molten aluminum and allowing it to fall back into the furnace.

[0037] To secure the stirring shaft 610 during maintenance, a safety locking mechanism 900 is provided. An open insertion slot 611 is provided at the top of the stirring shaft 610. Correspondingly, the locking mechanism 900 is installed on the insulation cover 500. The locking mechanism 900 includes a mounting block, a limiting rod 910, and an adjusting component 920. The mounting block is fixedly connected to the insulation cover 500 and has a horizontally oriented sliding groove. The limiting rod 910 passes horizontally through the sliding groove and can slide within it. The adjusting component 920 includes a spring 921 and a reset component 922. One end of the spring 921 is fixed to the inner wall of the sliding groove, and the other end abuts against and connects to the limiting rod 910, providing it with a constant thrust so that the head of the limiting rod 910 always tends to move towards the stirring shaft 610. When the stirring shaft 610 rises to its highest point and its insertion slot 611 aligns with the limiting rod 910, the limiting rod 910 will automatically pop out and insert into the insertion slot 611 under the action of the spring 921, thereby locking the stirring shaft 610 and preventing it from falling accidentally.

[0038] The reset element 922, used for unlocking, is a vertically positioned reset rod. The reset rod is mounted on the insulation cover 500, sliding up and down. An angled drive groove 911 is provided at the tail of the limiting rod 910. The lower end of the reset rod can be inserted into this drive groove 911. When unlocking is required, pressing down on the reset rod causes its lower end to generate a horizontal force against the spring 921, pulling the limiting rod 910 out of the insertion slot 611.

[0039] To further enhance safety, a secondary locking structure is also provided, including a locking pin 930 that is vertically inserted into the insulation cover 500, located above the limiting rod 910, and can slide up and down. A corresponding locking groove 912 is formed on the body of the limiting rod 910; after the limiting rod 910 is inserted into the insertion slot 611, the locking pin 930 is manually inserted downwards into the locking groove 912, which can lock the limiting rod 910 vertically, preventing it from accidentally dislodging due to vibration or other reasons, thus forming a double safety measure.

[0040] Finally, a drive assembly 940 is also provided for coordinated unlocking. The drive assembly 940 includes a drive ring 941 rotatably mounted on the insulation cover 500. A drive block 942 and a wedge block 944 are fixed on the drive ring 941; the drive block 942 has a wedge surface 945, which is initially separated from the reset rod and can abut against the top of the reset rod as it rotates; the position of the wedge block 944 corresponds to the tail boss of the locking pin 930, and the wedge block 944 is always inserted between the tail of the locking pin 930 and the insulation cover 500; when the drive ring 941 is rotated, the inclined surface of the wedge block 944 will push up the locking pin 930, causing it to be pulled out of the locking groove 912. Then, if the drive ring 941 is rotated again, the drive ring 941 will drive the wedge surface 945 of the drive block 942 to press down on the reset rod, causing it to move downward; a single rotation action can simultaneously release the main lock and the secondary lock, making the operation very convenient and safe. It also includes a reset spring 943, which is connected to the reset plug and helps the drive ring 941 to reset after it rotates.

[0041] In operation, the operator lowers the entire sliding frame 300 by controlling the lifting mechanism 400, ensuring the insulation cover 500 tightly seals over the furnace opening. Then, the drive motor 620 of the stirring mechanism 600 and the lifting mechanism 710 are activated, controlling the stirring shaft 610 to rotate and descend simultaneously, passing through the through-hole 510 to a designated depth in the molten aluminum for degassing. After the operation is complete, the lifting mechanism 710 raises the stirring shaft 610, and the scraper 800 automatically cleans the molten aluminum alloy on the stirring shaft 610. Finally, the lifting mechanism 400 lifts the entire device away from the furnace opening.

[0042] When maintenance of the stirring shaft 610 is required, raise it to its highest point. The limit rod 910 will automatically engage with the insertion slot 611 under the action of the spring 921, and then the locking pin 930 will be inserted to complete the double locking, ensuring maintenance safety. To unlock, simply rotate the drive ring 941 to complete all unlocking actions with one click.

[0043] This embodiment effectively solves the problems of heat loss and aluminum molten material splashing through the heat-insulating cover 500; it achieves two-stage adjustment of the stirring height (coarse and fine) through a dual lifting system, ensuring high precision without affecting the seal; it achieves automatic cleaning through the scraper 800; and it provides unparalleled operational convenience while ensuring extremely high safety through the innovative linkage snap-fit ​​mechanism 900. The overall device has a reasonable structure, a high degree of automation, and is safe and reliable, greatly improving the efficiency and quality of degassing operations in aluminum alloy smelting.

[0044] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A stirring device for an aluminum alloy melting and casting furnace, comprising: The base (100), the frame (200) disposed on the base (100), the sliding frame (300) sliding vertically along the frame (200), and the lifting mechanism (400) disposed on the frame (200) and connected to the sliding frame (300) are characterized in that: they further include: A heat-insulating cover (500) is provided on the sliding frame (300) for covering the melting furnace, and a through hole (510) is provided in the middle. The stirring mechanism (600) slides vertically on the sliding frame (300), and the stirring shaft (610) passes through the through hole (510). A lifting mechanism (710) is mounted on the sliding frame (300) and connected to the stirring mechanism (600) to drive the stirring mechanism (600) to lift.

2. The stirring device for an aluminum alloy melting and casting furnace according to claim 1, characterized in that: A scraper (800) is provided on the side of the heat preservation cover (500) away from the stirring mechanism (600), and the scraper (800) abuts against the stirring shaft (610) of the stirring mechanism (600).

3. The stirring device for an aluminum alloy melting and casting furnace according to claim 2, characterized in that: The lifting mechanism (710) adopts one of the following structures: hydraulic cylinder, air cylinder, sprocket and chain structure, or screw and nut structure.

4. The stirring device for an aluminum alloy melting and casting furnace according to claim 1, characterized in that: The stirring shaft (610) of the stirring mechanism (600) is provided with an open insertion groove (611), and the heat preservation cover (500) is provided with a snap-fit ​​mechanism (900). The snap-fit ​​mechanism (900) includes a limiting rod (910) and an adjusting component (920). The limiting rod (910) slides on the heat preservation cover (500) and can be inserted into the insertion groove (611).

5. The stirring device for an aluminum alloy melting and casting furnace according to claim 4, characterized in that: The adjusting component (920) includes a spring (921) and a reset component (922). The spring (921) is disposed on the heat preservation cover (500). The spring (921) is connected to the limiting rod (910) and drives the limiting rod (910) to approach the stirring shaft (610) of the stirring mechanism (600). The reset component (922) is disposed on the side wall of the heat preservation cover (500) near the sliding frame (300). The reset component (922) can drive the limiting rod (910) to slide.

6. The stirring device for an aluminum alloy melting and casting furnace according to claim 5, characterized in that: The limiting rod (910) is provided with a driving groove (911), and the reset member (922) includes a reset rod. The reset rod slides vertically on the heat preservation cover (500). The reset rod cooperates with the driving groove (911). When the reset rod is pressed down, the limiting rod (910) moves away from the stirring shaft (610) of the stirring mechanism (600).

7. The stirring device for an aluminum alloy melting and casting furnace according to claim 6, characterized in that: A locking pin (930) slides vertically on the heat insulation cover (500), and a corresponding locking groove (912) is provided on the limiting rod (910). When the limiting rod (910) cooperates with the insertion groove (611), the locking pin (930) is inserted into the locking groove (912).

8. The stirring device for an aluminum alloy melting and casting furnace according to claim 7, characterized in that: The heat preservation cover (500) is provided with a drive assembly (940), which includes a drive ring (941), a drive block (942), a reset spring (943), and a wedge (944). The drive ring (941) rotates on the heat preservation cover (500). The drive block (942) is disposed on the drive ring (941) and has a wedge surface (945) that corresponds to and abuts against the reset rod. The reset spring (943) is disposed on the heat preservation cover (500) and is connected to the reset rod, driving the reset rod closer to the sliding frame (300). The wedge (944) is disposed on the drive ring (941) and can cooperate with the locking pin (930). As the wedge (944) slides, it drives the locking pin (930) to be pulled out of the locking groove (912).

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