Anti-oxidation device for molten aluminum at inlet of casting die cavity

Abstract

The invention relates to the technical field of casting machining, and discloses a casting die cavity inlet molten aluminum anti-oxidation device which comprises a heat preservation furnace arranged in a casting rack. A crucible used for storing molten aluminum is arranged in the heat preservation furnace, a furnace cover is assembled on the top of the heat preservation furnace, and a machine shell is fixedly connected to the top of the furnace cover. And the liquid lifting part serves as a conveying runner for connecting the crucible and the casting mold cavity and comprises an adjusting pipe which is rotationally connected to the interior of the furnace cover in a damping mode, a liquid lifting pipe extending into the crucible is assembled at the bottom of the adjusting pipe, and an adjusting piece used for adjusting the inner diameter of a liquid lifting channel in the adjusting pipe is arranged in the adjusting pipe. The anti-oxidation device for the molten aluminum at the inlet of the casting die cavity can effectively solve the problems that in the prior art, the structural parameters of the riser tube are designed in a fixed mode, only the molten aluminum flow requirement of a single-specification casting can be met, and the batch alternate production requirement of multi-specification castings is difficult to meet.

Description

Technical Field

[0001] This invention relates to the field of casting processing technology, and specifically to a device for preventing oxidation of molten aluminum at the inlet of a casting mold cavity. Background Technology

[0002] Low-pressure casting, as a core process for forming aluminum and aluminum alloy castings, is widely used in the production of high-precision castings such as automotive parts and aerospace structural components due to its characteristics of high casting density, excellent forming accuracy, and strong process stability. In a low-pressure casting system, the riser pipe is a key flow channel component connecting the crucible molten pool and the casting mold cavity. By regulating the flow rate and velocity of the molten aluminum, it achieves stable injection into the mold cavity, directly determining the forming efficiency and internal quality of the casting.

[0003] However, the existing riser pipes have fixed structural parameters and can only match the aluminum flow rate requirements of a single type of casting. Since different castings have significantly different requirements for aluminum flow rate, thin-walled castings require low flow rate to prevent the aluminum liquid from impacting the mold cavity and causing forming deformation, while thick-walled castings require high flow rate to ensure that the mold cavity is filled quickly and to reduce solidification defects. Therefore, existing equipment requires separate configuration of special riser pipes and supporting equipment for different castings, which is difficult to adapt to the batch rotation production needs of multi-specification castings. Summary of the Invention

[0004] To address the aforementioned shortcomings of existing technologies, this invention provides an anti-oxidation device for molten aluminum at the inlet of a casting mold cavity. This device effectively solves the problem that in existing technologies, the structural parameters of the riser pipe are designed to be fixed, which can only match the molten aluminum flow requirements of a single-specification casting and is difficult to adapt to the batch production needs of multiple-specification castings.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This invention provides a device for preventing oxidation of molten aluminum at the inlet of a casting mold cavity, comprising:

[0007] A holding furnace located inside the casting machine frame;

[0008] The holding furnace is equipped with a crucible for storing molten aluminum, and a furnace cover is fitted on the top of the holding furnace, with an organic shell fixedly connected to the top of the furnace cover.

[0009] The liquid lifting section, which serves as a conveying channel connecting the crucible and the casting mold cavity, includes a damping rotatable adjustment pipe connected to the inside of the furnace cover. The bottom of the adjustment pipe is equipped with a liquid lifting pipe extending into the crucible, and the adjustment pipe is provided with an adjustment component for adjusting the inner diameter of its internal liquid lifting channel.

[0010] The housing is equipped with a switching component for driving the adjustment component to move. The switching component can drive the adjustment component to switch from a contracted state to an expanded state, so that the inner diameter of the liquid rising channel inside the adjustment tube changes to adapt to the flow rate requirements of different castings of aluminum liquid.

[0011] Furthermore, the regulating tube has a guide groove inside, and there are two guide grooves that are symmetrically distributed vertically along the central surface of the regulating tube. The regulating tube is rotatably connected to a ring seat one through an annular groove on its outer side. The bottom of the regulating tube is fixedly connected to a ring seat two that communicates with the liquid riser. Both the ring seat one and the ring seat two have guide holes on the side away from the regulating tube, and there are multiple guide holes that are distributed in a circular array along the central axis of the regulating tube.

[0012] Furthermore, the adjusting component includes an adjusting block slidably connected in the guide groove, a pin fixedly connected to the outside of the adjusting block and fitting against the inner wall of the guide hole, and a slot is opened on the side of the adjusting block near the axis of the adjusting tube.

[0013] Furthermore, the switching component includes a driven gear fixedly connected to the top of a ring seat, a drive motor fixedly connected inside the housing, and a driving gear meshing with the driven gear is fixedly connected to the output end of the drive motor.

[0014] Furthermore, the outer circumferential surface of the riser pipe is provided with a through hole near the furnace cover, and there are multiple through holes arranged in a circular array along the central axis of the riser pipe, with the bottom of the through hole being designed with a slope.

[0015] Furthermore, a ring is fitted on the outer circumference of the riser tube, and a slot is formed on the outer circumference of the ring. The slot and the through hole are arranged in a one-to-one correspondence. The inside of the slot is provided with a flow guide surface, and the inclination angle of the flow guide surface is the same as that of the inclined surface at the bottom of the through hole.

[0016] Furthermore, a conveying pipe connected to the casting mold cavity is fixedly connected inside the housing, and the conveying pipe is connected to the ring seat through a rotary joint at its bottom, so as to realize the conveying of aluminum liquid from the regulating pipe to the conveying pipe.

[0017] The outer circumference of the conveying pipe is fixedly connected with a fixing rod that penetrates the furnace cover and connects to the outer circumference of the ring. Multiple fixing rods are provided and distributed in a circular array along the central axis of the conveying pipe.

[0018] The technical solution provided by this invention has the following advantages compared with the prior art:

[0019] The present invention is provided with a liquid lifting part, which drives the ring seat to rotate around the axis of the adjusting tube through the meshing transmission of the driving gear and the driven gear; the circumferential array guide holes (inclined radially) opened in the ring seat generate a guiding thrust on the pin of the adjusting block, driving the adjusting block to slide synchronously along the guide groove. When the adjusting block moves closer to the axis of the regulating pipe, the inner diameter of the enclosed liquid riser channel decreases, adapting to the low flow rate requirements of thin-walled castings (preventing aluminum liquid from impacting the mold cavity and causing molding deformation); when the adjusting block moves away from the axis, the inner diameter of the liquid riser channel increases, meeting the high flow rate requirements of thick-walled castings (ensuring the mold cavity is filled quickly and reducing solidification defects), realizing the dynamic adjustment of the inner diameter of the liquid riser channel as needed, which can match the differentiated aluminum liquid flow rate requirements of different specifications of castings such as thin-walled and thick-walled. Furthermore, when the switching component drives the liquid riser pipe to rotate until the "through hole and slot hole are completely aligned", the two form a continuous gas flow channel; external low-pressure inert gas (such as nitrogen) enters the liquid riser pipe, liquid riser channel, and conveying pipe in sequence through this flow channel, and finally fills the casting cavity, completely replacing and expelling the air inside the holding furnace, liquid riser system, and mold cavity. High-temperature molten aluminum is transported in an inert gas atmosphere to avoid oxidation reaction with oxygen and the formation of oxide slag. An inert gas closed flow channel is constructed to isolate the molten aluminum from the air throughout the entire transport process, thereby preventing the high-temperature molten aluminum from oxidizing and forming oxide slag. This significantly reduces the slag inclusion defect rate in castings and ensures the mechanical properties of the castings. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0021] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the three-dimensional separation structure of the heat preservation furnace and the casting frame in an embodiment of the present invention;

[0023] Figure 3 This is a cross-sectional plan view of the heat-insulating furnace according to an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the three-dimensional separation structure of the liquid lifting section in an embodiment of the present invention;

[0025] Figure 5 This is a cross-sectional view of the regulating tube according to an embodiment of the present invention;

[0026] Figure 6 This is an embodiment of the present invention. Figure 5 A magnified structural diagram of part A in the middle;

[0027] Figure 7 This is a schematic diagram of the planar structure of the ring seat according to an embodiment of the present invention;

[0028] Figure 8 This is a schematic diagram of the three-dimensional separation structure of the ring and the riser tube in an embodiment of the present invention;

[0029] Figure 9 This is a schematic diagram of the three-dimensional state transformation of the ring according to an embodiment of the present invention;

[0030] Figure 10 This is an embodiment of the present invention. Figure 9 A magnified structural diagram of section B in the middle;

[0031] Figure 11 This is a schematic diagram of the three-dimensional state transformation of the adjustment block according to an embodiment of the present invention.

[0032] The labels in the diagram represent: 1. Insulation furnace; 2. Crucible; 3. Furnace cover; 31. Conveying pipe; 32. Fixing rod; 4. Housing; 5. Lifting section; 51. Adjusting pipe; 511. Guide groove; 512. Ring seat one; 513. Ring seat two; 514. Guide hole; 52. Lifting pipe; 521. Through hole; 522. Ring sleeve; 523. Slot hole; 524. Guide surface; 53. Adjusting component; 531. Adjusting block; 532. Pin shaft; 54. Switching component; 541. Driven gear; 542. Drive motor; 543. Driving gear. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0034] The present invention will be further described below with reference to embodiments.

[0035] Example:

[0036] Please see Figures 1-11 This invention provides a technical solution: a device for preventing oxidation of molten aluminum at the inlet of a casting mold cavity, comprising:

[0037] A holding furnace 1 is installed inside the casting machine frame;

[0038] The holding furnace 1 is equipped with a crucible 2 for storing molten aluminum, and the top of the holding furnace 1 is fitted with a furnace cover 3, with a shell 4 fixedly connected to the top of the furnace cover 3.

[0039] The liquid lifting section 5 serves as a conveying channel connecting the crucible 2 and the casting mold cavity. It includes an adjusting pipe 51 that is damped and rotatably connected to the inside of the furnace cover 3. The bottom of the adjusting pipe 51 is equipped with a liquid lifting pipe 52 that extends into the crucible 2. The adjusting pipe 51 is provided with an adjusting member 53 for adjusting the inner diameter of its internal liquid lifting channel.

[0040] The housing 4 is equipped with a switching element 54 for driving the adjustment element 53. The switching element 54 can drive the adjustment element 53 to switch from a contracted state to an expanded state, so that the inner diameter of the liquid rising channel inside the adjustment pipe 51 changes to match the flow rate requirements of different casting aluminum liquids.

[0041] The regulating pipe 51 has a guide groove 511 inside, and there are two guide grooves 511 that are symmetrically distributed vertically along the central surface of the regulating pipe 51. The regulating pipe 51 is rotatably connected to a ring seat 512 through an annular groove on its outer side. The bottom of the regulating pipe 51 is fixedly connected to a ring seat 513 that communicates with the liquid riser pipe 52. Both the ring seat 512 and the ring seat 513 have guide holes 514 on the side away from the regulating pipe 51, and there are multiple guide holes 514 that are arranged in a circular array along the central axis of the regulating pipe 51.

[0042] The adjusting component 53 includes an adjusting block 531 that is slidably connected in the guide groove 511. A pin 532 that fits against the inner wall of the guide hole 514 is fixedly connected to the outside of the adjusting block 531. A slot is opened on the side of the adjusting block 531 near the axis of the adjusting tube 51.

[0043] The switching component 54 includes a driven gear 541 fixedly connected to the top of the ring seat 512, a drive motor 542 fixedly connected inside the housing 4, and a drive gear 543 that meshes with the driven gear 541 fixedly connected to the output end of the drive motor 542.

[0044] A through hole 521 is provided on the outer circumference of the riser pipe 52 near the furnace cover 3. Multiple through holes 521 are provided and distributed in a circular array along the central axis of the riser pipe 52. The bottom of the through hole 521 is designed with a slope.

[0045] A ring 522 is fitted on the outer circumference of the riser tube 52. A slot 523 is opened on the outer circumference of the ring 522, and the slot 523 is arranged in a one-to-one correspondence with the through hole 521. A guide surface 524 is provided inside the slot 523, and the guide surface 524 has the same inclination angle as the bottom slope of the through hole 521.

[0046] The housing 4 is fixedly connected to a conveying pipe 31 that communicates with the casting mold cavity, and the conveying pipe 31 is connected to the ring seat 512 through a rotary joint at its bottom, so as to realize the conveying of aluminum liquid from the regulating pipe 51 to the conveying pipe 31.

[0047] A fixing rod 32 is fixedly connected to the outer circumference of the conveying pipe 31, which penetrates the furnace cover 3 and is connected to the outer circumference of the ring 522. Multiple fixing rods 32 are provided and are distributed in a circular array along the central axis of the conveying pipe 31.

[0048] The principle and advantages of the anti-oxidation device for molten aluminum at the inlet of the casting mold cavity:

[0049] Before starting the low-pressure casting equipment, the operating parameters of the equipment must be calibrated and set to ensure that all process parameters (such as gas pressure, motor speed, and aluminum liquid temperature threshold) meet the forming requirements of the target casting. After the parameters meet the standards, the external transfer mechanism is activated to move the holding furnace 1 with the built-in crucible 2 into the casting frame. The positioning system is used to accurately position the holding furnace 1 directly below the mold assembly inside the casting frame, achieving spatial positioning before operation and laying the positional foundation for subsequent aluminum liquid transportation and pouring.

[0050] The operator sends an action command to the drive motor 542 built into the switching unit 54. After receiving the control signal, the drive motor 542 starts, and its output shaft drives the driving gear 543, which is fixed to the shaft end, to rotate around its own axis. Since the driving gear 543 and the driven gear 541 form a meshing transmission pair, the rotational torque of the driving gear 543 is transmitted to the driven gear 541 through tooth surface meshing, ultimately driving the driven gear 541 to rotate counterclockwise at a constant angular velocity.

[0051] Driven gear 541 and ring seat 512 are rigidly connected. Ring seat 512 has multiple guide holes 514 arranged in a circular array along its central axis on the side away from adjusting tube 51. These guide holes 514 are inclined at a preset angle radially along ring seat 512, extending from the outer periphery of ring seat 512 towards its center. Under initial operating conditions (when ring seat 512 is not rotating), the pin 532 on the adjusting block 531 of adjusting member 53 engages with the guide holes 514, and the initial position of the pin 532 is located at the end of the guide hole 514 near the center of ring seat 512.

[0052] When the ring seat 512 rotates counterclockwise under the drive of the driven gear 541, the inner wall of the guide hole 514 exerts a combined effect of radial constraint and circumferential guidance on the fitted pin 532 (not a simple mechanical obstruction, but a motion guiding effect based on the channel profile). Under this action, the pin 532 drives the adjusting block 531 to move synchronously, thereby driving the adjusting tube 51 to overcome the damping between it and the furnace cover 3, and rotate counterclockwise along its own axis to achieve the position adjustment of the adjusting tube 51.

[0053] It is worth noting that the damping connection structure between the regulating pipe 51 and the furnace cover 3 can buffer the impact of the adjustment action when the switching component 54 drives the regulating pipe 51 to rotate (such as adjusting the alignment relationship between the through hole 521 and the slot hole 523) or drives the adjusting block 531 to slide (changing the inner diameter of the liquid riser channel). This makes the movement speed of the regulating pipe 51, the liquid riser 52 and the internal aluminum liquid smooth and controllable, ensuring the stable state of the aluminum liquid during the flow adjustment process and improving the casting forming accuracy.

[0054] During this process, the riser pipe 52, which is fixed to the bottom of the regulating pipe 51, rotates synchronously with the regulating pipe 51; while the ring 522 fitted around the outer circumference of the riser pipe 52 is fixed to the furnace cover 3 by the fixing rod 32, and always remains stationary and in a constant position. As the riser pipe 52 rotates, the through holes 521 opened on its outer circumference are simultaneously offset. In the initial state, the through holes 521 and the slots 523 on the ring 522 are misaligned. The inner wall of the ring 522 blocks the through holes 521, so that the riser pipe 52 maintains its structural integrity and provides a closed flow channel foundation for subsequent aluminum liquid transportation.

[0055] Because aluminum is a reactive metal, it is easy to generate oxide slag when high-temperature molten aluminum comes into contact with air. If there is residual air in the system, the oxide slag will enter the casting cavity with the molten aluminum, causing slag inclusion defects in the casting, reducing mechanical properties and even causing cracking. At the same time, the residual air will be wrapped and compressed by the molten aluminum during the pouring process, forming pores, which will damage the density of the casting and affect its appearance and load-bearing capacity.

[0056] When the riser pipe 52 drives the through hole 521 to deflect along its axis until it is completely aligned with the slot 523 of the ring sleeve 522 (the number of through holes 521 can be designed according to the casting process; three are selected in this embodiment), the two form a continuous air flow channel. At this time, the drive motor 542 of the switching component 54 stops running, and the regulating pipe 51 and the riser pipe 52 stop rotating synchronously. The external low-pressure gas generator delivers a preset amount of inert gas (nitrogen) to the holding furnace 1 through the conveying channel. The nitrogen enters the riser pipe 52 through the flow channel formed by the slot 523 and the through hole 521, and then flows through the riser channel formed by the splicing of the slots of the adjusting blocks 531 (the slots of multiple adjusting blocks 531 surround to form a complete flow channel), and finally enters the casting cavity through the conveying pipe 31 that is directly connected to the casting cavity. Because the mold assembly has a pre-set vent hole, the nitrogen gas entering the cavity is discharged from the vent hole, which completely removes the air from the heat preservation furnace 1, the liquid riser pipe 52, the liquid riser channel and the casting cavity. This not only avoids the aluminum liquid from contacting the air and causing oxidation, but also eliminates the conditions for the generation of porosity defects.

[0057] It is worth noting that the ring seat 512 and the conveying pipe 31 are connected by a high-temperature mechanical seal rotary joint, which ensures both the sealing of the aluminum liquid conveying and the motion compatibility between the rotation of the ring seat 512 and the fixation of the conveying pipe 31.

[0058] Since the structural parameters of the riser pipe 52 are fixed, it can only match the aluminum flow rate requirements of a single type of casting. However, the flow rate requirements of different castings vary significantly: thin-walled castings require low flow rates to prevent the aluminum liquid from impacting the mold cavity and causing molding deformation, while thick-walled castings require high flow rates to ensure that the mold cavity is filled quickly and to reduce solidification defects.

[0059] This device achieves flow adaptation in the following way: when the through hole 521 is blocked by the inner wall of the ring 522, the operator controls the drive motor 542 to rotate clockwise, and the driving gear 543 drives the driven gear 541 and the ring seat 512 to rotate clockwise through meshing transmission. At this time, the regulating pipe 51 remains stationary because it cannot overcome the damping force generated by the damping connection between it and the furnace cover 3. The guide hole 514 of the ring seat 512 drives the pin 532 of the adjusting block 531, causing the adjusting block 531 to move synchronously along the guide groove 511 opened inside the regulating pipe 51 (the number of adjusting blocks 531 can be designed according to the casting process; in this embodiment, six adjusting blocks 531 are selected), realizing the expansion movement of the inner end of the adjusting block 531 away from each other, forming a liquid rising channel with a regular hexagonal cross section. The displacement of adjacent adjusting blocks 531 in the extension direction of the guide groove 511 is complementary, ensuring that adjacent adjusting blocks 531 are always in close contact, ensuring the sealing of the liquid rising channel. By changing the inner diameter of the liquid rising channel, it can adapt to the aluminum liquid flow requirements of different castings.

[0060] After the riser channel is adjusted, the system is in a closed state, and the molten aluminum in crucible 2 has melted to the target temperature. The pressure control system applies gas pressure to the holding furnace 1. When the pressure on the surface of the molten aluminum is greater than the sum of the weight of the molten aluminum and the friction of the inner wall of the riser pipe 52, the molten aluminum slowly rises along the riser pipe 52 to the top of the riser pipe 52 and enters the riser channel. Then, it enters the casting cavity through the gate via the conveying pipe 31. When the cavity is completely filled with molten aluminum, the pressure control system maintains the current pressure for a preset time to allow the casting in the mold cavity to cool and solidify fully. Finally, the operator removes the casting from the mold assembly, completing one molding operation.

[0061] After the casting is removed, the adjusting block 531 needs to be reset and the components cleaned for subsequent cyclic operations: The operator controls the drive motor 542 to rotate counterclockwise again, driving the ring seat 512 to rotate counterclockwise. Since the pin 532 of the adjusting block 531 is not in the initial position of the guide hole 514 near the center of the ring seat 512 at this time, the guide hole 514 drives the pin 532 to drive the adjusting block 531 to reset along the guide groove 511 until the adjusting block 531 returns to the initial position; after the adjusting block 531 is reset, the drive motor 542 continues to drive the ring seat 512 to rotate counterclockwise, the guide hole 514 creates mechanical resistance to the pin 532, and then drives the regulating pipe 51 and the riser pipe 52 to overcome the damping and rotate as a whole again until the through hole 521 of the riser pipe 52 and the slot 523 of the ring sleeve 522 are aligned again.

[0062] During the reset process, the sidewalls of adjacent adjustment blocks 531 remain in contact, which can scrape off the residual molten aluminum adhering to the inner sidewall of another adjustment block 531, causing it to fall into the crucible 2. When the through hole 521 is aligned with the slot hole 523, the residual molten aluminum in the through hole 521 flows along its bottom slope into the guide surface 524 of the slot hole 523, and finally falls back into the crucible 2, realizing the recovery of residual molten aluminum and the cleaning of the device components, avoiding waste of molten aluminum and blockage of components.

[0063] The present invention employs a liquid lifting section 5, which has the following advantages:

[0064] Advantage 1: The switching component 54 serves as the power source. After the drive motor 542 starts, it drives the ring seat 512 to rotate around the axis of the regulating tube 51 through the meshing transmission of the driving gear 543 and the driven gear 541. The circumferential array guide holes 514 (inclined radially) opened in the ring seat 512 generate a guiding thrust on the pin 532 of the adjusting block 531, driving the adjusting block 531 to slide synchronously along the guide groove 511. When the adjusting block 531 moves closer to the axis of the regulating tube 51, the inner diameter of the liquid rising channel formed by the enclosure decreases, which is suitable for the low flow rate requirements of thin-walled castings (preventing aluminum liquid from impacting the mold cavity and causing molding deformation). When the adjusting block 531 moves away from the axis, the inner diameter of the liquid rising channel increases, which meets the high flow rate requirements of thick-walled castings (ensuring that the mold cavity is quickly filled and reducing solidification defects). This allows for dynamic adjustment of the inner diameter of the liquid rising channel as needed, which can match the differentiated aluminum liquid flow rate requirements of castings of different specifications such as thin-walled and thick-walled.

[0065] Secondly, when the switching component 54 drives the riser pipe 52 to rotate until the through hole 521 and the slot hole 523 are fully aligned, they form a continuous gas flow channel. External low-pressure inert gas (such as nitrogen) enters the riser pipe 52, the riser channel, and the conveying pipe 31 sequentially through this channel, ultimately filling the casting cavity and completely replacing and expelling the air from the holding furnace 1, the riser system, and the cavity. The high-temperature aluminum liquid is transported in an inert gas atmosphere, avoiding oxidation reactions with oxygen to form oxide slag. This constructs a closed inert gas flow channel, isolating the entire aluminum liquid transport process from air, preventing the oxidation of high-temperature aluminum liquid to form oxide slag, significantly reducing the slag inclusion defect rate in castings, and ensuring the mechanical properties of the castings.

[0066] Thirdly, the gas flow channel formed by "through hole 521 and slot hole 523" allows inert gas to fill the entire aluminum liquid transport link (crucible 2 → riser pipe 52 → riser channel → transport pipe 31 → cavity), and all air in the system is discharged through the pre-set exhaust hole of the mold. The aluminum liquid fills the cavity in an air-free environment, avoiding air from being trapped and reducing porosity defects at the source. Through inert gas replacement technology, residual air in the casting cavity and aluminum liquid transport channel is completely removed, preventing air from being trapped and forming pores during the aluminum liquid pouring process, thus improving the density and reliability of the casting.

[0067] Fourthly, it achieves automatic recovery of residual molten aluminum within the device, while simultaneously cleaning the inner walls of the components, preventing residual molten aluminum from solidifying and clogging the flow channels. The recovery and cleaning of residual molten aluminum are achieved through two coordinated structures: First, the adjustment block 531 is reset and cleaned. After the casting is formed, during the reset process of the adjustment block 531, the sidewalls of adjacent adjustment blocks 531 scrape against each other, removing residual molten aluminum adhering to the inner sidewall of the adjustment block 531. The scraped-off molten aluminum falls directly into the crucible 2 for recovery. Second, the through hole 521 and slot 523 guide and recover molten aluminum. The bottom of the through hole 521 in the riser pipe 52 is inclined, and the slot 523 in the ring 522 has a guide surface 524 at the same angle. Residual molten aluminum in the riser pipe 52 can flow along the inclined surface of the through hole 521 into the guide surface 524 of the slot 523, and finally flow back to the crucible 2. This reduces molten aluminum waste and prevents residual molten aluminum from cooling and solidifying, thus clogging the flow channels of the riser pipe 52 and through hole 521, ensuring smooth subsequent production.

[0068] Fifthly, the riser pipe 52 and the ring 522 constitute the core switching mechanism: In the initial gas path switching stage, the riser pipe 52 rotates to align the through hole 521 with the slot 523 of the ring 522, forming an inert gas flow channel (gas path opening). At this time, the ring 522 does not obstruct the delivery of aluminum liquid by the riser pipe 52. After the gas path replacement is completed, the riser pipe 52 rotates in the opposite direction to misalign the through hole 521 with the slot 523. The inner wall of the ring 522 blocks the through hole 521 (gas path sealing), and the aluminum liquid can enter the cavity along the riser pipe 52, the riser channel, and the delivery pipe 31 (liquid path opening). The entire switching process is achieved through the rotation of the riser pipe 52.

[0069] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for preventing oxidation of molten aluminum at the inlet of a casting mold cavity, characterized in that, include: A heat-holding furnace (1) located inside the casting machine frame; The heat preservation furnace (1) is equipped with a crucible (2) for storing molten aluminum, and the top of the heat preservation furnace (1) is fitted with a furnace cover (3), and the top of the furnace cover (3) is fixedly connected to a shell (4). The liquid lifting section (5) serves as a conveying channel connecting the crucible (2) and the casting mold cavity. It includes a damping rotatable adjustment pipe (51) connected to the inside of the furnace cover (3). The bottom of the adjustment pipe (51) is equipped with a liquid lifting pipe (52) extending into the crucible (2). The adjustment pipe (51) is provided with an adjustment element (53) for adjusting the inner diameter of its internal liquid lifting channel. The housing (4) is provided with a switching component (54) for driving the adjustment component (53) to move. The switching component (54) can drive the adjustment component (53) to switch from a contracted state to an expanded state, so that the inner diameter of the liquid rising channel inside the adjustment tube (51) changes to match the flow rate requirements of different casting aluminum liquids.

2. The anti-oxidation device for molten aluminum at the inlet of a casting mold cavity according to claim 1, characterized in that: The regulating pipe (51) has a guide groove (511) inside, and there are two guide grooves (511) that are symmetrically distributed along the center plane of the regulating pipe (51). The regulating pipe (51) is rotatably connected to a ring seat (512) through an annular groove on its outer side. The bottom of the regulating pipe (51) is fixedly connected to a ring seat (513) that communicates with the liquid riser (52). Both the ring seat (512) and the ring seat (513) have guide holes (514) on the side away from the regulating pipe (51), and there are multiple guide holes (514) that are arranged in a circular array along the central axis of the regulating pipe (51).

3. The anti-oxidation device for molten aluminum at the inlet of a casting mold cavity according to claim 2, characterized in that: The adjusting component (53) includes an adjusting block (531) that is slidably connected in the guide groove (511). A pin (532) that fits against the inner wall of the guide hole (514) is fixedly connected to the outside of the adjusting block (531). A slot is opened on the side of the adjusting block (531) near the axis of the adjusting tube (51).

4. The anti-oxidation device for molten aluminum at the inlet of a casting mold cavity according to claim 1, characterized in that: The switching component (54) includes a driven gear (541) fixedly connected to the top of the ring seat (512), a drive motor (542) fixedly connected inside the housing (4), and a drive gear (543) that meshes with the driven gear (541) is fixedly connected to the output end of the drive motor (542).

5. The anti-oxidation device for molten aluminum at the inlet of a casting mold cavity according to claim 1, characterized in that: The riser pipe (52) has a through hole (521) on the outer circumference of the side near the furnace cover (3), and there are multiple through holes (521) arranged in a circular array along the central axis of the riser pipe (52). The bottom of the through hole (521) is designed with a slope.

6. The anti-oxidation device for molten aluminum at the inlet of a casting mold cavity according to claim 1, characterized in that: The outer circumference of the riser tube (52) is fitted with a ring (522), and the outer circumference of the ring (522) is provided with a slot (523), and the slot (523) is provided in a one-to-one correspondence with the through hole (521). The inside of the slot (523) is provided with a guide surface (524), and the guide surface (524) has the same inclination angle as the bottom slope of the through hole (521).

7. The anti-oxidation device for molten aluminum at the inlet of a casting mold cavity according to claim 1, characterized in that: The housing (4) is fixedly connected to a conveying pipe (31) that communicates with the casting mold cavity. The conveying pipe (31) is connected to the ring seat (512) through a rotary joint at its bottom, so as to realize the conveying of aluminum liquid from the regulating pipe (51) to the conveying pipe (31). The outer circumference of the conveying pipe (31) is fixedly connected with a fixing rod (32) that penetrates the furnace cover (3) and connects to the outer circumference of the ring sleeve (522). Multiple fixing rods (32) are provided and are arranged in a circular array along the central axis of the conveying pipe (31).

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