Cast aluminum alloy refining and degassing device and method thereof

Abstract

The invention relates to the technical field of aluminum alloy casting, in particular to a cast aluminum alloy refining and degassing device and a method thereof.The cast aluminum alloy refining and degassing device comprises a base, a lifting frame is arranged on one side of the upper end of the base, the lifting output end of the lifting frame is connected with a supporting frame, and a degassing mechanism comprises a layered degassing assembly and a rotating speed control assembly which are arranged below the supporting frame; the layered degassing assembly comprises a gear ring arranged below the supporting frame, and a servo motor is arranged on one side of the gear ring. The lengths of a first graphite rotor, a second graphite rotor and a third graphite rotor in the layered degassing assembly are sequentially shortened, and the layered degassing assembly can stretch into different depths of an aluminum alloy melt to conduct stirring degassing; and the hydrogen contents of the melts at different depths are different, so that the aluminum alloy melts at different depths can be degassed in a targeted manner, the problem that the degassing is not thorough due to the fact that a rotor with a single length only can act on the local depth is avoided, and the overall degassing uniformity and thoroughness are greatly improved.

Description

Technical Field

[0001] This invention relates to the field of aluminum alloy casting technology, and in particular to a refining and degassing device and method for casting aluminum alloys. Background Technology

[0002] In the production of cast aluminum alloys, the hydrogen content in the molten aluminum alloy is a key factor affecting the quality of the castings. If the hydrogen content is too high, the castings are prone to defects such as porosity and looseness, which seriously reduces the mechanical properties and machinability of the material. Therefore, refining and degassing is a core process in the production of cast aluminum alloys. Currently, the mainstream degassing methods in the industry mostly adopt a structure of a single graphite rotor with continuous inert gas supply. Such devices have obvious technical shortcomings in practical applications and are difficult to meet the production requirements of high-quality aluminum alloy castings. First, the graphite rotor in traditional devices has a fixed length and can only act on specific depths of the molten aluminum alloy. Since the hydrogen content varies at different depths of the molten aluminum alloy (generally, deeper melts have higher hydrogen solubility and longer discharge paths, resulting in higher hydrogen content than shallower melts), a single rotor cannot target different depths of the melt for specific degassing. This leads to incomplete removal of hydrogen from deeper layers and either excessive or insufficient degassing from shallower layers, ultimately resulting in uneven overall degassing and the continued risk of porosity in different parts of the casting. Secondly, the graphite rotors in existing devices are mostly designed with a single rotation speed, which cannot be adjusted according to the melt depth. If a higher rotation speed is used to enhance the upward force of deep bubbles, it will cause the shallow melt to churn violently, increase the contact area with air, trigger oxidation reactions, and produce a large number of oxide inclusions; if the rotation speed is reduced to reduce surface churning, it will cause the deep bubbles to rise slowly, and the degassing efficiency will drop significantly. Finally, traditional degassing devices generally adopt a continuous inert gas supply mode. The continuous airflow impacts the surface of the melt, which can easily cause violent disturbances in the melt. This not only aggravates the formation of oxide inclusions, but may also increase the hydrogen content because the airflow carries air into the melt. At the same time, continuous gas supply also has problems such as low gas utilization and energy waste, which is not in line with the current industry trend of green production and urgently needs to be improved. Therefore, we propose a degassing device and method for refining cast aluminum alloys. Summary of the Invention

[0003] In view of the problem that the above-mentioned or existing technologies cannot perform degassing treatment on aluminum alloy melt at different levels, the present invention is proposed.

[0004] Therefore, the purpose of this invention is to provide a degassing device for refining cast aluminum alloys.

[0005] To solve the above technical problems, the present invention provides the following technical solution: a refining and degassing device for cast aluminum alloy, including a base, a lifting frame is provided on one side of the upper end of the base, and a support frame is connected to the lifting output end of the lifting frame; The degassing mechanism includes a layered degassing assembly and a speed control assembly disposed below the support frame; The stratified degassing assembly includes a gear ring disposed below the support frame. A servo motor is disposed on one side of the gear ring, and a first gear is mounted on the drive end of the servo motor. A support plate is fixedly mounted on the lower end of the support frame near the gear ring. A first graphite rotor, a second graphite rotor, and a third graphite rotor are respectively disposed on the lower end of the support plate, and the lengths of the first graphite rotor, the second graphite rotor, and the third graphite rotor gradually decrease in sequence, which is used for stratified degassing of aluminum alloy melt at different depths with different hydrogen contents. The speed control component includes an annular toothed groove disposed at the lower end of the inner side of the gear ring. The upper ends of the first graphite rotor, the second graphite rotor, and the third graphite rotor are respectively equipped with a second gear, a third gear, and a fourth gear, which are used to cooperate with the gear ring to drive the first graphite rotor, the second graphite rotor, and the third graphite rotor to rotate synchronously. The degassing auxiliary mechanism includes an intermittent air supply assembly disposed inside the gear ring. The intermittent air supply assembly includes a rotary joint disposed on the first graphite rotor, the second graphite rotor, and the third graphite rotor. The air inlet end of the rotary joint is connected to an air supply hose. An arc-shaped extrusion strip is disposed inside the gear ring, which is used to intermittently extrude the three air supply hoses in conjunction with the rotation of the gear ring.

[0006] As a preferred embodiment of the aluminum alloy refining and degassing device of the present invention, the staged degassing component further includes a slide rod disposed above the gear ring. The slide rod is fixedly connected to the gear ring by welding. There are two slide rods, which are symmetrically arranged. An annular groove is provided on the side of the support frame near the slide rod. The size of the slide rod is adapted to the size of the annular groove, and the slide rod is slidably connected to the annular groove.

[0007] In a preferred embodiment of the aluminum alloy refining and degassing device of the present invention, the first gear is disposed on one side of the gear ring and meshes with the outer side of the gear ring.

[0008] In a preferred embodiment of the aluminum alloy refining and degassing device of the present invention, the upper ends of the first graphite rotor, the second graphite rotor and the third graphite rotor are rotatably connected to the lower end of the support plate through bearings, and the first graphite rotor, the second graphite rotor and the third graphite rotor are arranged in a triangle on the horizontal cross section of the support plate.

[0009] In a preferred embodiment of the aluminum alloy refining and degassing device of the present invention, the diameters of the second gear, the third gear and the fourth gear gradually increase in sequence, and the second gear, the third gear and the fourth gear respectively mesh with the annular tooth groove.

[0010] In a preferred embodiment of the aluminum alloy refining and degassing device of the present invention, a control box is provided on the upper end of the base away from the support frame, and the control box is electrically connected to the lifting frame and the servo motor respectively.

[0011] As a preferred embodiment of the aluminum alloy refining and degassing device of the present invention, the intermittent gas supply component further includes an extrusion section disposed at the lower end of the gas supply hose. The extrusion section is disposed between the arc-shaped extrusion strip and the support frame. The inner cavity of the extrusion section is bonded with rubber sheets, and the rubber sheets are symmetrically arranged.

[0012] In a preferred embodiment of the aluminum alloy refining and degassing device of the present invention, the rubber strips are bonded to the inner side of the rubber sheet and are symmetrically arranged, and the upper and lower ends of the inner sides of the two rubber sheets are fixedly installed with support springs.

[0013] As a preferred embodiment of the aluminum alloy refining and degassing method of the present invention, wherein: S1. Height Adjustment: Based on the height of the molten aluminum alloy, an electrical signal is sent to the lifting frame through the control box on the base, driving the lifting frame to move the support frame and the layered degassing components up and down, adjusting the first graphite rotor, the second graphite rotor, and the third graphite rotor to preset positions that extend into the molten aluminum alloy at different depths. S2, Drive Start: The control box sends an electrical signal to the servo motor, and the servo motor drive end drives the first gear to rotate. The first gear meshes with the outer side of the gear ring, driving the gear to rotate around the preset circular trajectory. At the same time, the slide bar above the gear ring slides and limits its movement in the annular groove of the support frame. S3, Layered Differentiated Degassing: The inner ring tooth groove of the gear ring rotates synchronously and meshes with the second, third and fourth gears at the upper end of the first, second and third graphite rotors. As the diameters of the second, third and fourth gears increase sequentially, they drive the three graphite rotors to rotate synchronously at different speeds, stirring the melt at different depths. S4. Intermittent gas supply assistance: When the gear ring rotates, it drives the inner arc-shaped extrusion strip to move synchronously. The arc-shaped extrusion strip intermittently extrudes the gas supply hose, so that the inert gas is intermittently delivered to each graphite rotor through the rotary joint. The gas forms bubbles in the melt, adsorbs hydrogen, rises and is discharged, completing the refining and degassing process.

[0014] The beneficial effects of the casting aluminum alloy refining and degassing device of the present invention are as follows: The present invention can extend into different depths of the aluminum alloy melt for agitation and degassing by successively shortening the lengths of the first graphite rotor, the second graphite rotor and the third graphite rotor in the layered degassing component. Furthermore, since the hydrogen content varies at different depths of the melt, it can target the aluminum alloy melt at different depths for degassing, avoiding the problem that a rotor of a single length can only act on a local depth, resulting in incomplete degassing, and greatly improving the overall uniformity and thoroughness of degassing. Furthermore, by using the second, third, and fourth gears, which are successively larger in size, and in conjunction with the annular toothed groove, the different rotational speeds of the rotors can be achieved. Among them, the first graphite rotor (corresponding to the deeper aluminum alloy melt) has a higher rotational speed, which can enhance the upward movement of bubbles and accelerate the discharge of deep hydrogen. The third graphite rotor (corresponding to the shallower aluminum alloy melt) has a lower rotational speed, which can effectively reduce the surface turbulence of the aluminum alloy melt and avoid the increase of surface oxidation inclusions. While ensuring degassing efficiency, it can protect the melt quality to the greatest extent. Inert gas can also be intermittently supplied by intermittently extruding the gas supply hose through gear ring linkage with arc extrusion strip. Compared with continuous air supply, intermittent supply can avoid the situation where the surface of the melt churns violently due to continuous airflow impact, significantly reduce the contact area between the melt and air, reduce oxidation reaction, reduce the generation of oxide inclusions, and further improve the purity of aluminum alloy melt. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a first-view structural schematic diagram of a degassing device for refining cast aluminum alloys.

[0017] Figure 2 This is a second-view structural schematic diagram of a degassing device for refining cast aluminum alloys.

[0018] Figure 3 A top view schematic diagram of the layered degassing component and speed control component of a degassing device for refining cast aluminum alloys.

[0019] Figure 4 A bottom view of the layered degassing assembly and speed control assembly of a degassing device for refining cast aluminum alloys.

[0020] Figure 5 A schematic diagram of the intermittent gas supply component of a degassing device for refining cast aluminum alloys.

[0021] Figure 6 A top view schematic diagram of the first gear and gear ring of a refining and degassing device for cast aluminum alloys.

[0022] Figure 7 This is a schematic diagram of the internal structure of the extrusion section of a refining and degassing device for cast aluminum alloys.

[0023] Labels: 100, Degassing Mechanism; 101, Base; 102, Lifting Frame; 103, Support Frame; 104, Gear Ring; 105, Slide Rod; 106, Annular Slide Groove; 107, Servo Motor; 108, First Gear; 109, Annular Gear Groove; 110, First Graphite Rotor; 111, Second Graphite Rotor; 112, Third Graphite Rotor; 113, Support Plate; 114, Second Gear; 115, Third Gear; 116, Fourth Gear; 117, Control Box; 200, Degassing Auxiliary Mechanism; 201, Rotary Joint; 202, Air Supply Hose; 203, Arc-shaped Extrusion Strip; 205, Extrusion Section; 206, Rubber Sheet; 207, Rubber Strip; 208, Support Spring. Detailed Implementation

[0024] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0025] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0026] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0027] Example 1, referring to Figures 1 to 5This is the first embodiment of the present invention, which provides a refining and degassing device for cast aluminum alloys. It includes a base 101, a lifting frame 102 on one side of the upper end of the base 101, a support frame 103 connected to the lifting output end of the lifting frame 102, and a degassing mechanism 100, including a layered degassing component and a speed control component disposed below the support frame 103. The layered degassing component includes a gear ring 104 disposed below the support frame 103, a servo motor 107 disposed on one side of the gear ring 104, a first gear 108 mounted on the drive end of the servo motor 107, and a support plate 113 fixedly mounted on the lower end of the support frame 103 near the gear ring 104. A first graphite rotor 110, a second graphite rotor 111, and a third graphite rotor 112 are respectively disposed on the lower end of the support plate 113, with the lengths of the first graphite rotor 110, the second graphite rotor 111, and the third graphite rotor 112 gradually decreasing in length to accommodate aluminum alloy melt at different depths. Different hydrogen contents are used for stratified degassing. The speed control component includes an annular toothed groove 109 located at the lower inner end of the gear ring 104. The upper ends of the first graphite rotor 110, the second graphite rotor 111, and the third graphite rotor 112 are respectively equipped with a second gear 114, a third gear 115, and a fourth gear 116, which are used to cooperate with the gear ring 104 to drive the first graphite rotor 110, the second graphite rotor 111, and the third graphite rotor 112 to rotate synchronously. The degassing auxiliary mechanism 200 includes an intermittent gas supply component located inside the gear ring 104. The intermittent gas supply component includes a rotary joint 201 located on the first graphite rotor 110, the second graphite rotor 111, and the third graphite rotor 112. The air inlet end of the rotary joint 201 is connected to a gas supply hose 202. An arc-shaped extrusion strip 203 is provided inside the gear ring 104, which is used to intermittently extrude the three gas supply hoses 202 in conjunction with the rotation of the gear ring 104.

[0028] Before operation, the first graphite rotor 110, the second graphite rotor 111, and the third graphite rotor 112 in the layered degassing assembly are adjusted to appropriate heights based on the height of the molten aluminum alloy. This allows the three rotors to penetrate the molten aluminum alloy to different depths. Then, the servo motor 107 is activated, driving the first gear 108 to rotate. The first gear 108 meshes with the gear ring 104, causing the gear ring 104 to rotate. The annular tooth groove 109 inside the gear ring 104 rotates synchronously. Since the annular tooth groove 109 meshes with the second gear 114, the third gear 115, and the fourth gear 116 on the upper ends of the first, second, and third graphite rotors 112 respectively, and the sizes of the three gears increase sequentially, according to the gear transmission principle (under the same transmission ring, the gear diameter is inversely proportional to the rotational speed), the second gear 114 (corresponding to the first graphite rotor 110) has the highest rotational speed, and the fourth gear 116 (corresponding to the third graphite rotor 112) has the highest rotational speed. 12) The lowest rotational speed allows for differentiated rotation of the three rotors. During rotor rotation, the melt at the corresponding depth is effectively agitated. Simultaneously, inert gas supplied by the subsequent gas supply assembly causes the gas to form bubbles in the melt. After adsorbing hydrogen, the gas rises with the bubbles and is discharged, completing stratified degassing. This avoids the problem of a single-length rotor only acting on a local depth, resulting in incomplete degassing. Furthermore, when the gear ring 104 rotates, the arc-shaped extrusion strip 203 on the inner side of the gear ring 104 rotates synchronously. When the arc-shaped extrusion strip 203 rotates to the position of the gas supply hose 202, it will exert a squeezing effect on the gas supply hose 202, temporarily blocking the airflow in the hose. When the arc-shaped extrusion strip 203 leaves the gas supply hose 202, the hose is unblocked, and the inert gas enters each graphite rotor through the rotary joint 201 and is transported to the melt by the rotor. Through the continuous rotation of the arc-shaped extrusion strip 203, intermittent squeezing of the three gas supply hoses 202 is achieved, thereby providing intermittent inert gas to each rotor and avoiding the situation where the surface of the melt churns due to continuous gas supply.

[0029] Specifically, the staged degassing assembly also includes a slide rod 105 disposed above the gear ring 104. The slide rod 105 is fixedly connected to the gear ring 104 by welding. There are two slide rods 105, which are symmetrically arranged. The support frame 103 has an annular groove 106 on the side near the slide rod 105. The size of the slide rod 105 is adapted to the size of the annular groove 106, and the slide rod 105 and the annular groove 106 are slidably connected.

[0030] In this embodiment, when the servo motor 107 drives the gear ring 104 to rotate, the two symmetrical sliding rods 105 welded and fixed above the gear ring 104 will slide synchronously in the annular groove 106 opened in the support frame 103. The shape of the annular groove 106 is adapted to the movement trajectory of the sliding rod 105, which limits the movement direction of the sliding rod 105, thereby preventing the sliding rod 105 from shifting laterally during the movement. Since the sliding rod 105 is fixedly connected to the gear ring 104, the stable sliding of the sliding rod 105 in the annular groove 106 can drive the gear ring 104 to always maintain the preset circumferential trajectory rotation, avoiding the gear ring 104 from shaking or shifting due to uneven force, thereby ensuring that the annular tooth groove 109 on the inner side of the gear ring 104 can maintain stable meshing with the gears of each graphite rotor, providing structural support for subsequent speed control and degassing operations.

[0031] Furthermore, the first gear 108 is disposed on one side of the gear ring 104, and the first gear 108 meshes with the outer side of the gear ring 104.

[0032] In this embodiment, after the servo motor 107 starts, its output torque is transmitted to the first gear 108 mounted on the drive end, causing the first gear 108 to rotate around its own axis. Since the first gear 108 is located on one side of the gear ring 104 and meshes with the outer tooth surface of the gear ring 104, according to the meshing principle of gear transmission, the rotation of the first gear 108 is converted into the circular motion of the gear ring 104, transmitting the power of the servo motor 107 to the gear ring 104. Because the first gear 108 meshes with the outer side of the gear ring 104, the gear ring 104 can respond quickly to the speed adjustment of the servo motor 107 and maintain stable rotation.

[0033] The upper ends of the first graphite rotor 110, the second graphite rotor 111, and the third graphite rotor 112 are rotatably connected to the lower end of the support plate 113 via bearings, and the first graphite rotor 110, the second graphite rotor 111, and the third graphite rotor 112 are arranged in a triangular pattern on the horizontal cross section of the support plate 113.

[0034] In this embodiment, when the annular toothed groove 109 drives the second gear 114, the third gear 115, and the fourth gear 116 to rotate, each gear drives the corresponding first graphite rotor 110, the second graphite rotor 111, and the third graphite rotor 112 to rotate accordingly. Since the upper ends of the three rotors are all connected to the lower end of the support plate 113 through bearings, the stability of the rotation of the three rotors is ensured. Since the three rotors are arranged in a triangular pattern on the horizontal cross section of the support plate 113, when the rotors rotate synchronously, their stirring range can cover the triangular area in the melt. Moreover, the stirring areas of the three rotors complement each other, avoiding dead corners in the melt that are not stirred, ensuring that the inert gas can diffuse evenly in the melt and improving the degassing coverage.

[0035] Preferably, the diameters of the second gear 114, the third gear 115, and the fourth gear 116 gradually increase in sequence, and the second gear 114, the third gear 115, and the fourth gear 116 respectively mesh with the annular tooth groove 109.

[0036] In this embodiment, when the gear ring 104 rotates, the annular tooth groove 109 on the inner side of the gear ring 104 synchronously performs circular motion. The annular tooth groove 109 meshes with the second gear 114, the third gear 115, and the fourth gear 116 respectively, driving the three gears to rotate synchronously. Since the diameter of the three gears gradually increases, according to the principle of gear transmission ratio (the smaller the diameter of the gear, the higher its speed), the first graphite rotor 110 driven by the second gear 114 (smallest diameter) has the highest speed, and the third graphite rotor 112 driven by the fourth gear 116 (largest diameter) has the lowest speed, thus forming a gradient of decreasing speed. Furthermore, the three gears mesh with the annular tooth groove 109 at the same time, and the rotation of the annular tooth groove 109 can simultaneously drive the three gears to move synchronously, thereby causing the three graphite rotors to rotate synchronously, thus realizing synchronous degassing of multiple rotors.

[0037] It should be noted that a control box 117 is provided on the upper end of the base 101 away from the support frame 103. The control box 117 is electrically connected to the lifting frame 102 and the servo motor 107 respectively.

[0038] In this embodiment, the operator inputs the lifting parameters corresponding to the melt surface depth and the rotation speed parameters required for degassing through the operation interface of the control box 117. After receiving the input signal, the control box 117 sends an electrical signal to the drive device of the lifting frame 102 to control the lifting motor of the lifting frame 102 to operate, driving the support frame 103 and the degassing mechanism 100 to move up and down until each graphite rotor reaches the preset depth. At the same time, the control box 117 sends an electrical signal to the servo motor 107 to adjust the output speed of the servo motor 107. The servo motor 107 adjusts its rotation speed according to the signal, thereby controlling the rotation speed of the gear ring 104, and finally realizing the adjustment of the rotation speed of each graphite rotor.

[0039] Example 2, refer to Figures 1 to 7 This is the second embodiment of the present invention. Unlike the previous embodiment, this embodiment provides a refining and degassing device for cast aluminum alloys. The intermittent gas supply component also includes an extrusion part 205 disposed at the lower end of the gas supply hose 202. The extrusion part 205 is disposed between the arc-shaped extrusion strip 203 and the support frame 103. A rubber sheet 206 is bonded to the inner cavity of the extrusion part 205, and the rubber sheets 206 are symmetrically arranged.

[0040] In this embodiment, inert gas is delivered to the rotary joint 201 through the gas supply hose 202. When the arc-shaped extrusion strip 203 is not extruding the gas supply hose 202, the gas can smoothly enter the rotor through the hose. When the arc-shaped extrusion strip 203 rotates with the gear ring 104 to the extrusion section 205, the arc-shaped extrusion strip 203 applies pressure to the gas supply hose 202 in the extrusion section 205. The symmetrical rubber sheets 206 bonded to the inner cavity of the extrusion section 205 adhere to the hose under pressure, so that the two rubber strips 207 abut together, thereby squeezing the inner cavity of the hose to a closed state and blocking the gas flow. When the arc-shaped extrusion strip 203 leaves, the rubber sheets 206 return to their original shape under the action of the support spring 208, and the inner cavity of the hose is unblocked again, so that the gas can continue to be delivered, thereby achieving the effect of intermittent gas supply, thus avoiding the situation where the surface of the melt churns violently due to the continuous impact of the airflow.

[0041] Specifically, rubber strips 207 are bonded to the inner side of the rubber sheet 206, and the rubber strips 207 are symmetrically arranged. Support springs 208 are fixedly installed at the upper and lower ends of the inner side of the two rubber sheets 206.

[0042] In this embodiment, when the arc-shaped extrusion bar 203 extrudes the gas supply hose 202, the rubber sheet 206 inside the extrusion section 205 moves towards the center, and the rubber strip 207 on the inner side of the rubber sheet 206 makes close contact, thereby achieving the effect of sealing the gas supply channel. At the same time, the elasticity of the rubber strip 207 can buffer the impact force during extrusion, avoiding excessive local stress on the hose. When the arc-shaped extrusion bar 203 leaves, the support springs 208 fixed at the upper and lower ends of the inner side of the rubber sheet 206 will generate elastic restoring force, pushing the rubber sheet 206 to quickly return to its original position on both sides, so that the hose can quickly return to unobstructed flow, ensuring that the inert gas can be delivered to the rotor in a timely manner, and avoiding gas supply interruption due to slow return of the rubber sheet 206. The elasticity of the support spring 208 can be adapted according to the material and diameter of the hose to ensure that the return speed matches the rotation rhythm of the arc-shaped extrusion bar 203, ensuring the stability of intermittent gas supply.

[0043] The rest of the structure is the same as in Example 1.

[0044] Example 3, referring to Figures 1 to 7 This is the third embodiment of the present invention. Unlike the previous embodiment, this embodiment provides a method for refining and degassing aluminum alloys, including the casting aluminum alloy refining and degassing apparatus described in the previous embodiments, which comprises: S1. Height adjustment: Based on the height of the molten aluminum alloy, an electrical signal is sent to the lifting frame 102 through the control box 117 on the base 101, driving the lifting frame 102 to move the support frame 103 and the layered degassing assembly up and down, adjusting the first graphite rotor 110, the second graphite rotor 111, and the third graphite rotor 112 to preset positions that extend into the molten aluminum alloy at different depths respectively. S2, Drive Start: The control box 117 sends an electrical signal to the servo motor 107, and the drive end of the servo motor 107 drives the first gear 108 to rotate. The first gear 108 meshes with the outer side of the gear ring 104, driving the gear ring 104 to rotate around a preset circumferential trajectory. At the same time, the slide rod 105 above the gear ring 104 slides and is limited in the annular slide groove 106 of the support frame 103. S3. Layered Differentiated Degassing: The inner annular tooth groove 109 of the gear ring 104 rotates synchronously and meshes with the second, third, and fourth gears at the upper end of the first, second, and third graphite rotors. As the diameters of the second, third, and fourth gears increase sequentially, they drive the three graphite rotors to rotate synchronously at differentiated speeds, thus agitating the melt at different depths. S4. Intermittent gas supply assistance: When the gear ring 104 rotates, it drives the inner arc-shaped extrusion strip 203 to move synchronously. The arc-shaped extrusion strip 203 intermittently extrudes the gas supply hose 202, so that the inert gas is intermittently delivered to each graphite rotor through the rotary joint 201. The gas forms bubbles in the melt, adsorbs hydrogen, rises and is discharged, completing the refining and degassing.

[0045] The rest of the structure is the same as in Example 2.

[0046] It should be noted that 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 preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A degassing device for refining cast aluminum alloys, characterized in that: include, A base (101) is provided with a lifting frame (102) on one side of the upper end of the base (101), and a support frame (103) is connected to the lifting output end of the lifting frame (102). The degassing mechanism (100) includes a layered degassing component and a speed control component disposed below the support frame (103); The stratified degassing assembly includes a gear ring (104) disposed below the support frame (103), a servo motor (107) disposed on one side of the gear ring (104), a first gear (108) mounted on the drive end of the servo motor (107), a support plate (113) fixedly mounted on the lower end of the support frame (103) near the gear ring (104), and a first graphite rotor (110), a second graphite rotor (111) and a third graphite rotor (112) respectively disposed on the lower end of the support plate (113), and the lengths of the first graphite rotor (110), the second graphite rotor (111) and the third graphite rotor (112) gradually decrease in sequence, for stratified degassing of aluminum alloy melt at different depths with different hydrogen contents; The speed control component includes an annular toothed groove (109) disposed on the lower inner side of the gear ring (104). The upper ends of the first graphite rotor (110), the second graphite rotor (111), and the third graphite rotor (112) are respectively equipped with a second gear (114), a third gear (115), and a fourth gear (116), which are used to cooperate with the gear ring (104) to drive the first graphite rotor (110), the second graphite rotor (111), and the third graphite rotor (112) to rotate synchronously. The degassing auxiliary mechanism (200) includes an intermittent gas supply assembly disposed inside the gear ring (104). The intermittent gas supply assembly includes a rotary joint (201) disposed on the first graphite rotor (110), the second graphite rotor (111), and the third graphite rotor (112). The air inlet end of the rotary joint (201) is connected to a gas supply hose (202). An arc-shaped extrusion strip (203) is disposed inside the gear ring (104) for the rotation of the gear ring (104) to intermittently extrude the three gas supply hoses (202) by the arc-shaped extrusion strip (203).

2. The casting aluminum alloy refining and degassing device as described in claim 1, characterized in that: The graded degassing assembly also includes a slide rod (105) disposed above the gear ring (104). The slide rod (105) is fixedly connected to the gear ring (104) by welding. There are two slide rods (105) and they are symmetrically arranged. The support frame (103) has an annular groove (106) on the side near the slide rod (105). The size of the slide rod (105) is adapted to the size of the annular groove (106), and the slide rod (105) is slidably connected to the annular groove (106).

3. The casting aluminum alloy refining and degassing device as described in claim 2, characterized in that: The first gear (108) is disposed on one side of the gear ring (104), and the first gear (108) meshes with the outer side of the gear ring (104).

4. The casting aluminum alloy refining and degassing device as described in claim 3, characterized in that: The upper ends of the first graphite rotor (110), the second graphite rotor (111), and the third graphite rotor (112) are rotatably connected to the lower end of the support plate (113) through bearings, and the first graphite rotor (110), the second graphite rotor (111), and the third graphite rotor (112) are arranged in a triangle on the horizontal cross section of the support plate (113).

5. The casting aluminum alloy refining and degassing device as described in claim 4, characterized in that: The diameters of the second gear (114), the third gear (115), and the fourth gear (116) gradually increase in sequence, and the second gear (114), the third gear (115), and the fourth gear (116) mesh with the annular tooth groove (109) respectively.

6. The casting aluminum alloy refining and degassing device as described in claim 5, characterized in that: A control box (117) is provided on the upper end of the base (101) away from the support frame (103). The control box (117) is electrically connected to the lifting frame (102) and the servo motor (107).

7. The casting aluminum alloy refining and degassing device as described in claim 6, characterized in that: The intermittent gas supply assembly also includes a compression part (205) disposed at the lower end of the gas supply hose (202). The compression part (205) is disposed between the arc-shaped compression strip (203) and the support frame (103). The inner cavity of the compression part (205) is bonded with a rubber sheet (206), and the rubber sheet (206) is symmetrically arranged.

8. The casting aluminum alloy refining and degassing device as described in claim 7, characterized in that: A rubber strip (207) is bonded to the inner side of the rubber sheet (206), and the rubber strip (207) is symmetrically arranged. Support springs (208) are fixedly installed at the upper and lower ends of the inner sides of the two rubber sheets (206).

9. A method for degassing aluminum alloy refining, characterized in that: Includes the refining and degassing apparatus for cast aluminum alloys as described in any one of claims 1-8. S1. Height adjustment: Based on the height of the aluminum alloy melt, an electrical signal is sent to the lifting frame (102) through the control box (117) on the base (101), driving the lifting frame (102) to move the support frame (103) and the layered degassing assembly up and down, adjusting the first graphite rotor (110), the second graphite rotor (111), and the third graphite rotor (112) to preset positions that extend into the aluminum alloy melt at different depths respectively; S2, Drive Start: The control box (117) sends an electrical signal to the servo motor (107), and the drive end of the servo motor (107) drives the first gear (108) to rotate. The first gear (108) meshes with the outer side of the gear ring (104), driving the gear ring (104) to rotate around the preset circumferential trajectory. At the same time, the slide bar (105) above the gear ring (104) slides and is limited in the annular slide groove (106) of the support frame (103). S3, Layered Differentiated Degassing: The inner annular tooth groove (109) of the gear ring (104) rotates synchronously and meshes with the second, third and fourth gears at the upper end of the first, second and third graphite rotors. As the diameters of the second, third and fourth gears increase sequentially, they drive the three graphite rotors to rotate synchronously at different speeds to agitate the melt at different depths. S4. Intermittent gas supply assistance: When the gear ring (104) rotates, it drives the inner arc-shaped extrusion strip (203) to move synchronously. The arc-shaped extrusion strip (203) intermittently extrudes the gas supply hose (202), so that the inert gas is intermittently delivered to each graphite rotor through the rotary joint (201). The gas forms bubbles in the melt, adsorbs hydrogen, rises and is discharged, completing the refining and degassing.

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