Degassing and impurity removing system and degassing and impurity removing method for aluminum alloy melt

Abstract

The invention provides an aluminum alloy melt degassing and impurity removing system and a degassing and impurity removing method, and relates to the technical field of aluminum alloys. The degassing and impurity removing system comprises a furnace body and a furnace cover which can be connected in a sealed mode, a vacuum pipe is communicated with the furnace cover and a vacuum system, a base is connected into the furnace cover, two blowing pipes are arranged on the base, gas rings are arranged on the peripheries of the bottom ends of the blowing pipes, gas rods are connected with the gas rings and the bottom ends of the blowing pipes, and a driving gear is rotationally arranged in the base. An inner ring gear which is coaxial with the driving gear is arranged in the base on the periphery of the driving gear, and two driven gears are meshed between the driving gear and the inner ring gear; the injection pipe is communicated with an inert gas source, the interiors of the gas ring and the gas rod are cavities and are communicated, the gas rod is communicated with the injection pipe, and a plurality of gas holes are uniformly distributed in the gas ring and the gas rod. The gas and impurity removal method comprises the following steps: sealing the furnace cover and the furnace body, and blowing inert gas to melt through the gas ring and the gas rod; vacuumizing through a vacuum pipe; and inert gas is blown in a pulse mode. The gas and impurity removal effect and the gas and impurity removal efficiency are improved.

Description

Technical Field

[0001] The invention relates to the technical field of aluminum alloys, and in particular to a degassing and impurity removal system and a degassing and impurity removal method for an aluminum alloy melt. Background Art

[0002] Recycled aluminum alloy refers to an aluminum alloy obtained through a series of reprocessing processes, using waste aluminum alloy materials and scrap aluminum or aluminum-containing waste, and then re-melting and refining. It is an important source of metallic aluminum and is of great significance to the recycling of aluminum resources.

[0003] In the prior art, degassing and impurity removal of aluminum alloy melt can be achieved by introducing inert gas into the melt. However, it is difficult for the inert gas to contact the melt evenly and to be completely dispersed into the melt, resulting in that part of the melt is difficult to be blown by the inert gas or the amount of inert gas blown is low, resulting in unsatisfactory degassing and impurity removal effect and degassing and impurity removal efficiency of the melt. Summary of the invention

[0004] The purpose of the present invention is to develop a degassing and impurity removal system and a degassing and impurity removal method for an aluminum alloy melt which can improve the degassing and impurity removal effect and degassing and impurity removal efficiency.

[0005] The present invention is achieved through the following technical solutions:

[0006] A degassing and impurity removal system for aluminum alloy melt, comprising:

[0007] Furnace body and furnace cover that can be sealed and connected;

[0008] A vacuum tube connected to the furnace cover and the vacuum system;

[0009] A base, connected to the furnace cover;

[0010] Two blowing pipes are arranged on the base;

[0011] The air ring is arranged at the outer periphery of the bottom end of the blowing pipe;

[0012] Gas rod, connected with the gas ring and the bottom end of the blowing pipe;

[0013] A driving gear is rotatably arranged in the base, an inner ring gear coaxial with the driving gear is arranged in the base outside the driving gear, and two driven gears meshing with the driving gear and the inner ring gear are arranged between the driving gear and the inner ring gear;

[0014] A circular hole is provided through the center of the driven gear, and the two blowing pipes are slidably arranged in the circular hole. A first disc coaxially connected to the driving gear is rotatably provided on the base, and the blowing pipe passes through the first disc. A reciprocating thread groove is provided on the outer wall of the blowing pipe, and a driving block slidably matched with the reciprocating thread groove is rotatably connected to the first disc;

[0015] The blowing pipe is connected to an inert gas source, the insides of the gas ring and the gas rod are both hollow and connected, the gas rod is connected to the blowing pipe, and the gas ring and the gas rod are evenly covered with a plurality of air holes.

[0016] Optionally, the air ring is in an annular shape and has a circular cross section, the air ring and the blowing pipe are coaxial, and four cross-shaped air rods are provided between the air ring and the blowing pipe.

[0017] Optionally, the two driven gears are symmetrically arranged on both sides of the driving gear and are located in the same radial direction of the driving gear, the driving gear is located on the axis of the furnace body, and the sum of the outer diameters of the two air rings does not exceed the inner diameter of the furnace body.

[0018] Optionally, a motor is provided on the top of the base, and a reduction gear box provided in the base is provided to transmit transmission connection between the motor and the driving gear.

[0019] Optionally, a plurality of suspension rods or electric push rods connected to the furnace cover are vertically provided on the top of the base.

[0020] Optionally, the base is cylindrical with a closed top and an open bottom, the first disc is rotatably arranged in the base, the second disc is rotatably arranged at the bottom of the base, the first disc, the second disc and the top of the base are correspondingly provided with through holes coaxial with the circular hole for the blowing pipe to pass through, the top and bottom ends of the driving gear are coaxially rotatably connected to the first disc and the second disc respectively, and the top and bottom ends of the driven gear are rotatably connected to the first disc and the second disc respectively.

[0021] Optionally, two guide grooves parallel to the axial direction are provided on the outer wall of the blowing pipe, the two guide grooves are symmetrically arranged in the same radial direction of the blowing pipe, and two guide plates in sliding contact with the two guide grooves are vertically provided on the inner wall of the circular hole.

[0022] Optionally, the first disc is provided with a driving ring which is sleeved on the outside of the blowing tube and is coaxial with the blowing tube, and the driving block is rotatably arranged on the inner wall of the driving ring.

[0023] A degassing and impurity removal method for an aluminum alloy melt degassing and impurity removal system comprises the following steps:

[0024] S1. When the aluminum alloy melt is degassed and impurities are removed, the furnace cover is covered on the furnace body and sealed, the lower part of the blow pipe and the gas ring and gas rod enter the melt in the furnace body, the gas source transports inert gas to the blow pipe, the inert gas passes through the blow pipe and is ejected from the air holes on the gas rod and the gas ring, the inert gas rises in the melt, absorbs and takes away the dissolved gas and impurities in the melt, and the gas is output from the vacuum tube on the furnace cover. At this time, the vacuum system has not yet started, and there is no negative pressure in the furnace cover;

[0025] S2. After the inert gas is sprayed on the melt for a period of time, the gas source is closed to stop the inert gas from entering, and the vacuum system is operated to evacuate the furnace cover and the furnace body, so that the dissolved gas in the melt continuously generates bubbles and floats up to the liquid surface and is removed;

[0026] S3. The gas source intermittently delivers inert gas to the blowpipe for pulsed jetting, and the vacuum system maintains vacuum on the furnace cover and the furnace body;

[0027] S4. After the degassing and impurity removal is completed, the vacuum system stops evacuating, the furnace cover rises, and the blowing pipe, gas ring, and gas rod are separated from the melt;

[0028] Among them, in the steps S1 to S3, the driving gear keeps rotating to drive the two driven gears to move in a circle and rotate around it, and the two blow pipes drive the air rings and air rods at their bottom ends to also move in a circle and rotate around themselves. During the rotation of the blow pipes, the reciprocating threaded grooves on their outer walls and the sliding cooperation of the driving blocks drive the blow pipes to drive the air rings and air rods at their bottom ends to cyclically lift and lower movements.

[0029] Optionally, in step S3, when the blowing tube descends to the bottom, the gas source blows inert gas.

[0030] The beneficial effects of the present invention are:

[0031] The two gas rings and the gas rods inside the two gas rings of the present invention move in a circular motion and rotate in the furnace body, and also move up and down, so that the gas rings and the gas rods are basically in contact with all the melts in the furnace body, so that the inert gas sprayed by the gas rings and the gas rods is completely dispersed into the melt, thereby improving the degassing and impurity removal effect and degassing and impurity removal efficiency of the melt;

[0032] The movement of the gas ring and the gas rod creates a stirring effect on the melt. Stirring can make the inert gas form smaller and more evenly distributed bubbles in the melt. These tiny bubbles can more effectively contact the gas and impurities in the melt, thereby improving the degassing and impurity removal efficiency.

[0033] The inert gas is blown into the melt while vacuuming is performed. After a period of vacuuming, the inert gas is pulse-blown into the melt to further enhance the degassing and impurity removal effect and improve the degassing and impurity removal efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0035] Figure 1 It is a structural diagram of the present invention;

[0036] Figure 2 This is the internal structure diagram of the base;

[0037] Figure 3 This is the structural diagram of the gas ring and gas rod.

[0038] Figure numerals: 1. base; 2. first disc; 3. second disc; 4. driving gear; 5. driven gear; 6. inner ring gear; 7. driving ring; 8. blowing pipe; 9. air ring; 10. reciprocating thread groove; 11. guide groove; 12. air rod; 13. furnace body; 14. furnace cover; 15. vacuum tube; 16. air intake hose. DETAILED DESCRIPTION

[0039] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0041] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0042] like Figures 1 to 3 As shown, the present invention discloses a degassing and impurity removal system for aluminum alloy melt, including a furnace body 13, in which the melt is placed, and a furnace cover 14 which can be raised and lowered and sealed with the furnace body 13 is arranged above the furnace body 13, and a vacuum tube 15 is arranged on the furnace cover 14, and the vacuum tube 15 is connected to the vacuum system.

[0043] A liftable base 1 is also provided above the furnace body 13. The base 1 is arranged horizontally, is cylindrical, has a closed top and an open bottom, and has a plurality of suspension rods connected to the furnace cover 14 vertically provided on the top of the base 1. The suspension rods can also be replaced by electric push rods so that the base 1 can be lifted and lowered at the bottom of the furnace cover 14.

[0044] A first disc 2 is rotatably disposed inside the base 1 , and a second disc 3 is rotatably disposed at the bottom of the base 1 . The first disc 2 and the second disc 3 are both coaxial with the base 1 , and the edges of the first disc 2 and the second disc 3 are rotatably connected to the inner wall of the base 1 .

[0045] A driving gear 4 and two driven gears 5 are rotatably connected between the first disc 2 and the second disc 3. The top and bottom ends of the driving gear 4 are coaxially rotatably connected to the first disc 2 and the second disc 3 respectively. The two driven gears 5 are symmetrically arranged on both sides of the driving gear 4 and are located in the same radial direction of the driving gear 4. The top and bottom ends of the driven gear 5 are rotatably connected to the first disc 2 and the second disc 3 respectively.

[0046] An inner ring gear 6 is provided on the inner side wall of the base 1 between the first disc 2 and the second disc 3 . The inner ring gear 6 is coaxial with the driving gear 4 . The two driven gears 5 are meshed with the driving gear 4 and the inner ring gear 6 .

[0047] A motor is provided at a corresponding position on the top of the base 1, and a reduction gear box arranged in the base 1 is connected to the motor and the driving gear 4. The operation of the motor drives the driving gear 4 to rotate, and the driving gear 4 drives the two driven gears 5 to rotate and make a circular motion around the driving gear 4. The first disc 2 and the second disc 3 rotate with the circular motion of the driven gear 5.

[0048] A circular hole is provided through the center of the driven gear 5, and through holes coaxial with the circular hole are also provided in the first disc 2 above the circular hole, the top of the base 1, and the second disc 3 below the circular hole. A blowing pipe 8 is slidably provided in the circular hole, and the blowing pipe 8 passes through the through holes of the first disc 2, the second disc 3, and the top of the base 1.

[0049] Two guide grooves 11 parallel to the axial direction are provided on the outer wall of the blow pipe 8. The two guide grooves 11 are symmetrically arranged in the same radial direction of the blow pipe 8. Two guide plates that are in sliding contact with the two guide grooves 11 are vertically provided on the inner wall of the circular hole. The guide plates are inserted into the guide grooves 11 to realize the sliding connection between the blow pipe 8 and the circular hole. The blow pipe 8 can only slide axially in the circular hole for lifting and lowering, and the blow pipe 8, the circular hole and the driven gear 5 cannot rotate relative to each other.

[0050] The first disc 2 is provided with a driving ring 7 which is sleeved on the outside of the blowing tube 8. The driving ring 7 is coaxial with the blowing tube 8 and is fixedly connected to the first disc 2. A reciprocating thread groove 10 is provided on the outer wall of the blowing tube 8. A driving block is rotatably provided on the inner wall of the driving ring 7. The shape of the driving block is adapted to the groove body of the reciprocating thread groove 10. The driving block slides in the reciprocating thread groove 10. Since the driving block is rotatable, it is rotated and adjusted in the reciprocating thread groove 10 as the arc of the trajectory changes. When the blowing tube 8 rotates in the driving ring 7, the blowing tube 8 rises and falls in the driving ring 7 under the sliding cooperation between the driving block and the reciprocating thread groove 10.

[0051] An air ring 9 is provided at the bottom of the blowing pipe 8. The air ring 9 is in a circular shape and has a circular cross section. The air ring 9 is coaxial with the blowing pipe 8. Four cross-shaped air rods 12 are provided inside the air ring 9. The two ends of the air rods 12 are respectively connected to the air ring 9 and the bottom of the blowing pipe 8. The insides of the air ring 9 and the air rods 12 are both hollow and connected. The air rods 12 are connected to the blowing pipe 8. The air rings 9 and the air rods 12 are evenly covered with a number of air holes. There is a small spacing between the air rings 9 at the bottom of the two blowing pipes 8. The driving gear 4 is on the axis of the furnace body 13, and the gap between the two air rings 9 and the inner wall of the furnace body 13 is also small. When the two air rings 9 and the inner air rod 12 rotate and move in a circle, the covered area includes almost the entire interior of the furnace body 13, that is, on the same cross-section of the furnace body 13, the area covered by the two air rings 9 and the inner air rod 12 is in the form of a circular ring with a very small inner diameter, and the outer diameter of the circular ring is slightly different from the inner diameter of the furnace body 13. Since the air ring 9 is circular, the air flow ejected from the air holes on its outer side can also cover the inner and outer sides of the circular ring, so that the melt on the same cross-section in the furnace body 13 can be sprayed with inert gas.

[0052] The top end of the blowing pipe 8 is connected with an air intake hose 16, and a sealing ring is rotatably provided on the furnace cover 14. The air intake hose 16 passes through the sealing ring and is connected with an inert gas source.

[0053] The present invention also discloses a degassing and impurity removal method of the aluminum alloy melt degassing and impurity removal system, comprising the following steps:

[0054] S1. When the aluminum alloy melt is degassed and impurities are removed, the furnace cover 14 is covered on the furnace body 13 and sealed, the lower part of the blow pipe 8 and the gas ring 9 and the gas rod 12 enter the melt in the furnace body 13, and the gas source delivers inert gas to the blow pipe 8 through the air inlet hose 16. After passing through the blow pipe 8, the inert gas is ejected from the gas holes on the gas rod 12 and the gas ring 9. The inert gas rises in the melt to absorb and take away the dissolved gas and impurities in the melt, and the gas is output from the vacuum tube 15 on the furnace cover 14. At this time, the vacuum system has not yet started, and there is no negative pressure in the furnace cover 14;

[0055] S2. After the inert gas is blown into the melt for a period of time, the gas source is closed to stop the inert gas from entering, and the vacuum system is operated to evacuate the furnace cover 14 and the furnace body 13, so that the dissolved gas in the melt continuously generates bubbles and floats up to the liquid surface and is removed;

[0056] S3. The gas source intermittently delivers inert gas to the blowing pipe 8 for pulse jetting, and the vacuum system maintains the vacuum inside the furnace cover 14 and the furnace body 13;

[0057] S4. After the degassing and impurity removal is completed, the vacuum system stops evacuating, the furnace cover 14 rises and the blowing pipe 8, the gas ring 9, and the gas rod 12 are separated from the melt;

[0058] Among them, in steps S1 to S3, the operation of the motor drives the driving gear 4 to rotate, and the two driven gears 5 rotate accordingly and make a circular motion around the driving gear 4. The first disc 2 and the second disc 3 rotate under the drive of the driven gear 5, and the driven gear 5 rotates on the first disc 2 and the second disc 3. The blowing pipe 8 rotates with the driven gear 5 and makes a circular motion around the driving gear 4. When the blowing pipe 8 rotates, the reciprocating thread groove 10 on the outer wall of the blowing pipe 8 slides with the driving block on the inner wall of the driving ring 7. The blowing tube 8 is raised or lowered. When the driving block slides to the bottom rotation point or the top rotation point of the reciprocating thread groove 10, the blowing tube 8 is lowered or raised, thereby realizing the cyclic lifting and lowering motion of the blowing tube 8. When the driving block slides at the bottom rotation point and the top rotation point of the reciprocating thread groove 10, the driving block rotates adaptively correspondingly with the change of the arc of the trajectory. The blowing tube 8 drives the gas ring 9 and the gas rod 12 to rotate, make a circular motion around the center of the furnace body 13, and continuously cyclically lift and lower to stir the melt;

[0059] In step S3, when the blowing pipe 8 descends to the bottom, the gas source blows the inert gas.

[0060] The above embodiments are only preferred embodiments of the present invention and are not limitations of the technical solutions of the present invention. Any technical solution that can be implemented on the basis of the above embodiments without creative work should be deemed to fall within the scope of protection of the patent of the present invention.

Claims

1. A degassing and impurity removal system for aluminum alloy melt, characterized in that: include: Furnace body and furnace cover that can be sealed and connected; A vacuum tube connected to the furnace cover and the vacuum system; A base, connected to the furnace cover; Two blowing pipes are arranged on the base; The air ring is arranged at the outer periphery of the bottom end of the blowing pipe; Gas rod, connected with the gas ring and the bottom end of the blowing pipe; A driving gear is rotatably arranged in the base, an inner ring gear coaxial with the driving gear is arranged in the base outside the driving gear, and two driven gears meshing with the driving gear and the inner ring gear are arranged between the driving gear and the inner ring gear; A circular hole is provided through the center of the driven gear, and the two blowing pipes are slidably arranged in the circular hole. A first disc coaxially connected to the driving gear is rotatably provided on the base, and the blowing pipe passes through the first disc. A reciprocating thread groove is provided on the outer wall of the blowing pipe, and a driving block slidably matched with the reciprocating thread groove is rotatably connected to the first disc; The blowing pipe is connected to an inert gas source, the insides of the gas ring and the gas rod are both hollow and connected, the gas rod is connected to the blowing pipe, and the gas ring and the gas rod are evenly covered with a plurality of air holes.

2. The aluminum alloy melt degassing and impurity removal system according to claim 1, characterized in that: The air ring is in an annular shape and has a circular cross section. The air ring and the blowing pipe are in a coaxial state. Four cross-shaped air rods are arranged between the air ring and the blowing pipe.

3. The aluminum alloy melt degassing and impurity removal system according to claim 2, characterized in that: The two driven gears are symmetrically arranged on both sides of the driving gear and are located in the same radial direction of the driving gear. The driving gear is located on the axis of the furnace body. The sum of the outer diameters of the two air rings does not exceed the inner diameter of the furnace body.

4. The aluminum alloy melt degassing and impurity removal system according to claim 3, characterized in that: A motor is arranged on the top of the base, and a reduction box arranged in the base is transmission-connected between the motor and the driving gear.

5. The aluminum alloy melt degassing and impurity removal system according to claim 1, characterized in that: A plurality of suspension rods or electric push rods connected to the furnace cover are vertically arranged on the top of the base.

6. The aluminum alloy melt degassing and impurity removal system according to claim 3, characterized in that: The base is cylindrical with a closed top and an open bottom. The first disc is rotatably arranged in the base, and the second disc is rotatably arranged at the bottom of the base. The first disc, the second disc and the top of the base are correspondingly provided with through holes coaxial with the circular hole for the blowing pipe to pass through. The top and bottom ends of the driving gear are coaxially rotatably connected to the first disc and the second disc respectively, and the top and bottom ends of the driven gear are rotatably connected to the first disc and the second disc respectively.

7. The aluminum alloy melt degassing and impurity removal system according to claim 6, characterized in that: The outer wall of the blowing pipe is provided with two guide grooves parallel to the axial direction thereof, the two guide grooves are symmetrically arranged in the same radial direction of the blowing pipe, and the inner wall of the circular hole is vertically provided with two guide plates in sliding contact with the two guide grooves.

8. The aluminum alloy melt degassing and impurity removal system according to claim 6, characterized in that: The first disc is provided with a driving ring which is sleeved on the outside of the blowing pipe and is coaxial with the blowing pipe, and the driving block is rotatably arranged on the inner wall of the driving ring.

9. A degassing and impurity removal method for an aluminum alloy melt degassing and impurity removal system according to any one of claims 1 to 8, characterized in that: The steps include: S1. When the aluminum alloy melt is degassed and impurities are removed, the furnace cover is covered on the furnace body and sealed, the lower part of the blow pipe and the gas ring and gas rod enter the melt in the furnace body, the gas source transports inert gas to the blow pipe, the inert gas passes through the blow pipe and is ejected from the air holes on the gas rod and the gas ring, the inert gas rises in the melt, absorbs and takes away the dissolved gas and impurities in the melt, and the gas is output from the vacuum tube on the furnace cover. At this time, the vacuum system has not yet started, and there is no negative pressure in the furnace cover; S2. After the inert gas is sprayed on the melt for a period of time, the gas source is closed to stop the inert gas from entering, and the vacuum system is operated to evacuate the furnace cover and the furnace body, so that the dissolved gas in the melt continuously generates bubbles and floats up to the liquid surface and is removed; S3. The gas source intermittently delivers inert gas to the blowpipe for pulsed jetting, and the vacuum system maintains vacuum on the furnace cover and the furnace body; S4. After the degassing and impurity removal is completed, the vacuum system stops evacuating, the furnace cover rises, and the blowing pipe, gas ring, and gas rod are separated from the melt; Among them, in the steps S1 to S3, the driving gear keeps rotating to drive the two driven gears to move in a circle and rotate around it, and the two blow pipes drive the air rings and air rods at their bottom ends to also move in a circle and rotate around themselves. During the rotation of the blow pipes, the reciprocating threaded grooves on their outer walls and the sliding cooperation of the driving blocks drive the blow pipes to drive the air rings and air rods at their bottom ends to cyclically lift and lower movements.

10. The degassing and impurity removal method of the aluminum alloy melt degassing and impurity removal system according to claim 9, characterized in that: In the step S3, when the blowing pipe descends to the bottom, the gas source blows the inert gas.

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