CN114273632A - Liquid-cooled aluminum alloy semi-solid pulping process - Google Patents
Liquid-cooled aluminum alloy semi-solid pulping process Download PDFInfo
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- CN114273632A CN114273632A CN202111542842.6A CN202111542842A CN114273632A CN 114273632 A CN114273632 A CN 114273632A CN 202111542842 A CN202111542842 A CN 202111542842A CN 114273632 A CN114273632 A CN 114273632A
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- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 27
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 27
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- 229910001220 stainless steel Inorganic materials 0.000 claims description 42
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Abstract
The invention discloses a liquid-cooled aluminum alloy semi-solid pulping process, which comprises the following steps: firstly, a manipulator drives a container to scoop up molten aluminum from an aluminum liquid tank, and moves the container to the lower part of a stirring device, and the lower part of the stirring device is immersed into the aluminum liquid in the container; the stirring device comprises a stirring shaft, and the stirring shaft can rotate around a vertical axis; an inflow pipe and a return pipe are arranged in the stirring shaft, and the inflow pipe is communicated with the lower part of the return pipe; while the stirring shaft rotates, cooling liquid flows through the inflow pipe and the return pipe; thirdly, after stirring for a set time, stopping rotation of the stirring shaft; the robotic arm lowers the container to disengage the stirring device from the container. Compared with the prior art, the cooling liquid is arranged in the stirring shaft for cooling, so that the formation of dendritic crystals is promoted, the formed dendritic crystals are scattered by the stirring shaft for uniform dispersion, and the pulping efficiency of the aluminum alloy melt is greatly improved.
Description
Technical Field
The invention relates to the technical field of aluminum alloy semi-solid slurry preparation, in particular to a liquid-cooled aluminum alloy semi-solid slurry preparation process.
Background
The aluminum alloy semi-solid forming technology comprises two categories of rheoforming and thixoforming, semi-solid metal blanks used for thixoforming have higher solid phase fraction, are more convenient to convey and heat, and are easy to realize automatic operation, so that the industrial application of the early semi-solid forming technology is mainly focused on the thixoforming process; with the application and popularization of the thixoforming technology, the equipment cost is high, the processing excess material cannot be quickly recovered, the surface of the blank is oxidized due to secondary remelting, the production period is long, and the energy consumption is high, so that the development of the thixoforming technology is restricted; therefore, the rheoforming technology has recently become a research hotspot in the field of semi-solid forming of aluminum alloys; the rheoforming technology is to control the quality of slurry in the temperature interval from liquid state to semi-solid state, so that proper technological measures are adopted to prepare high quality semi-solid slurry in short time and the fast connection between semi-solid slurry and rheoforming is the key of rheoforming technology.
The preparation process of the aluminum alloy semi-solid slurry is divided into two processes, one is that the melt is stirred by an external action field, and the other is that the melt does not need to be stirred by the external action field; the former method is to apply strong stirring by using an external field in the alloy solidification process, the growth of dendrites is inhibited by convection caused by stirring, and under the conditions of high stirring shear rate and low cooling rate, the dendrites finally evolve into spherical or nearly spherical shapes, such as a mechanical stirring method, an electromagnetic stirring method and an ultrasonic vibration method; the traditional stirring mode is that a stirring shaft rotates at a high speed in an aluminum alloy melt, so that nucleation and growth modes of primary solid phases are changed to a certain extent or formed dendrites are broken fully. But such pulping is inefficient.
Another process is to prepare semi-solid slurry by controlling internal factors such as temperature, alloying elements, nucleation, etc., such as low superheat casting method, chemical grain refinement method, controlled nucleation method, strain-induced melt activation method; however, this method has a disadvantage in that it requires precise control of external conditions such as temperature, composition, and the like.
In view of the above, the applicant has made an intensive study on the above-mentioned defects in the prior art, and has made this invention.
Disclosure of Invention
The invention mainly aims to provide a liquid-cooled aluminum alloy semi-solid pulping process which has the characteristic of high pulping efficiency.
In order to achieve the above purpose, the solution of the invention is:
a liquid-cooled aluminum alloy semi-solid pulping process comprises the following steps:
firstly, a manipulator drives a container to scoop up molten aluminum from an aluminum liquid tank, and moves the container to the lower part of a stirring device, and the lower part of the stirring device is immersed into the aluminum liquid in the container;
the stirring device comprises a stirring shaft, and the stirring shaft can rotate around a vertical axis; an inflow pipe and a return pipe are arranged in the stirring shaft, and the inflow pipe is communicated with the lower part of the return pipe; while the stirring shaft rotates, cooling liquid flows through the inflow pipe and the return pipe;
thirdly, after stirring for a set time, stopping rotation of the stirring shaft; the robotic arm lowers the container to disengage the stirring device from the container.
Furthermore, the upper end of the stirring shaft is connected with a liquid supply device for providing cooling liquid, and the liquid supply device comprises a shell, a storage box, a delivery pump, a power supply battery and a balancing and adjusting mechanism; the shell is fixedly connected with the upper end of the stirring shaft; the storage box is arranged at the top of the inner cavity of the shell, cooling liquid is filled in the storage box, the delivery pump is arranged at the lower part of the storage box, and the storage box is connected with an inlet of the delivery pump; the outlet of the conveying pump is connected with the inflow pipe of the stirring shaft through a pipeline; the return pipe of the stirring shaft is connected with the storage tank through a pipeline; the power supply storage battery is arranged on the inner wall of the shell and supplies power to the delivery pump through a lead; the balancing adjusting mechanism is arranged at the bottom of the inner cavity of the shell and comprises a fixed seat, an adjusting screw rod and a balancing weight, the fixed seat is fixedly connected with the inner wall of the shell, the adjusting screw rod is rotatably connected with the fixed seat, a threaded hole is formed in the balancing weight, the adjusting screw rod is in threaded connection with the threaded hole, and the balancing weight is in sliding connection with the bottom surface of the inner cavity of the shell; the length direction of the adjusting screw rod is perpendicular to the rotation axis of the stirring shaft and penetrates through the rotation axis of the stirring shaft; one end of the adjusting screw rod is positioned outside the shell, and one end of the adjusting screw rod, which is positioned outside the shell, is fixedly provided with an adjusting hand wheel.
Furthermore, a refrigeration piece is arranged in the storage box and connected with the power supply storage battery through a lead.
Furthermore, a first storage battery and a second storage battery are arranged in the shell, the mass and the electric storage capacity of the first storage battery are larger than those of the second storage battery, a first refrigerating sheet and a second refrigerating sheet are arranged in the storage box, and the first storage battery is connected with the conveying pump and the first refrigerating sheet through conducting wires; the second storage battery is connected with the second refrigerating sheet through a lead; the first battery jar and the second battery jar are respectively positioned at two sides of the inner cavity of the shell and are oppositely spaced from the rotating axis of the stirring shaft by 180 degrees; and the balancing adjusting mechanism is positioned below the second storage battery.
Further, the step I comprises leveling operation, namely rotating the stirring shaft and starting the conveying pump, and rotating an adjusting hand wheel according to the shaking condition of the stirring shaft to adjust the position of a balancing weight until the stirring shaft rotates stably; after the stirring shaft is used for a period of time, the residual aluminum liquid on the stirring shaft is periodically cleaned and the leveling operation is carried out again.
Furthermore, a support ring for supporting the stirring shaft is arranged on the stirring shaft, the stirring shaft is rotatably connected with the support ring, and a power mechanism for driving the stirring shaft to rotate is further arranged on the stirring shaft.
Further, a stirring rod extending in the radial direction is formed on the stirring shaft.
And step three, after the stirring shaft stops rotating, the conveying pump still works for a period of time.
Further, the stirring device also comprises an auxiliary stirring mechanism, wherein the auxiliary stirring mechanism comprises a square fixing frame, a stainless steel thin-wall cylinder, a first sliding limiting rod, a second sliding limiting rod, a third sliding limiting rod, four driving rods and a driving mechanism; the section of the stainless steel thin-wall cylinder in a free state is circular, a plurality of through holes are distributed on the stainless steel thin-wall cylinder, a first sliding limiting rod, a second sliding limiting rod and a third sliding limiting rod are respectively connected to the outer wall of the stainless steel thin-wall cylinder, the second sliding limiting rod, the first sliding limiting rod and the third sliding limiting rod form an included angle of 90 degrees, and the first sliding limiting rod and the third sliding limiting rod are located on the same straight line position; the outer wall of the stainless steel thin-wall cylinder is also provided with a step seat, and the step seat is positioned on the outer wall of the stainless steel thin-wall cylinder opposite to the second sliding limiting rod; the step seat, the first sliding limiting rod, the second sliding limiting rod and the third sliding limiting rod are positioned on the same horizontal plane, driving rods are hinged between the adjacent limiting rods and the limiting rods or between the limiting rods and the step seat, and the four driving rods form a closed annular structure; the first sliding limiting rod, the second sliding limiting rod and the third sliding limiting rod are arranged on three edges of the square fixing frame in a sliding mode; the driving rods are connected with a driving mechanism for changing the angles of two adjacent driving rods; the stainless steel thin-wall cylinder changes cyclically among a first circular state, a first elliptical state, a second circular state and a second elliptical state, the length of the ellipse in the first elliptical state is along the direction of the second sliding limiting rod, and the long axis of the ellipse in the second elliptical state is along the direction of the first sliding limiting rod.
Furthermore, auxiliary tension rods extending downwards are formed on the step seat, the first sliding limiting rod, the second sliding limiting rod and the third sliding limiting rod, and the auxiliary tension rods are attached to the outer wall of the stainless steel thin-walled cylinder.
Further, swing rods are fixedly arranged on two adjacent driving rods, pivot holes are formed in one ends of the swing rods, which are far away from the driving rods, and movable rods of two electric push rods with mutually connected tails are respectively hinged with the pivot holes of the two swing rods; the two electric push rods extend out simultaneously or retract simultaneously to change the angle between the two swing rods.
Further, the driving mechanism comprises a mounting base, a rotary table, a sliding block, a sliding rail, a connecting rod and a transmission rod, and the mounting base is fixedly connected with the square fixing frame; the carousel rotates to be connected on the installation base, the slide rail is fixed to be set up on the installation base, the length direction of slide rail along the slip direction of the second slip gag lever post, the slider slides and sets up the carousel edge rotates and is connected with the connecting rod, the one end that the carousel was kept away from to the connecting rod with the slider rotates to be connected, along with the rotation of carousel, the slider is in reciprocating sliding on the slide rail, be connected with the transfer line on the slider, the transfer line is kept away from the junction of two actuating levers of one end and step seat top of slider rotates to be connected.
After the structure is adopted, the liquid-cooled aluminum alloy semi-solid pulping process has the following beneficial effects:
one, through set up inflow pipe and back flow in the (mixing) shaft, make when the (mixing) shaft rotates and stirs, let in the coolant liquid in inflow pipe and the back flow, thereby the coolant liquid heat absorption is taken away partial heat and is promoted the formation of dendritic crystal in aluminium liquid around the (mixing) shaft, and the dendritic crystal that forms is broken up by the (mixing) shaft after producing to evenly distributed accomplishes the slurrying in aluminium liquid. Compared with the traditional pulping method only by stirring with a stirring shaft, the method promotes the formation of dendritic crystals, can disperse the dendritic crystals in time to enable the dendritic crystals to be uniformly distributed, and improves the pulping efficiency.
Secondly, because the (mixing) shaft needs to rotate, need carry the coolant liquid and withdraw the coolant liquid from the back flow to the inflow pipe again simultaneously, through set up the liquid supply device at the (mixing) shaft upper end and along with the (mixing) shaft rotates together, reduced the complexity of pipeline design. When the cooling device is used, the conveying pump extracts the cooling liquid in the storage tank and conveys the cooling liquid to the inlet of the inflow pipe through the pipeline, and the conveying pump is arranged at the lower part of the storage tank, so that even if the storage tank rotates, the conveying pump can also smoothly absorb the cooling liquid due to the fact that the inlet of the conveying pump is connected with the lower bottom of the storage tank.
And thirdly, the balancing adjustment operation is carried out on the stirring shaft and the liquid supply device before formal use, and when the adjusting screw rod is rotated, the distance between the balancing weight and the rotating axis of the stirring shaft can be adjusted, so that the gravity center of the stirring shaft and the liquid supply device as a whole is on the rotating axis of the stirring shaft, and the stirring shaft is more stable and balanced when rotating.
Fourthly, through set up the refrigeration piece in the storage box for the coolant liquid after the intensification can cool down, keeps the coolant liquid to keep in suitable operating temperature scope. The volume in the storage box and the volume of the cooling liquid in the storage box can be designed and adjusted according to needs, and the cooling effect of the cooling liquid is guaranteed.
Fifthly, a support ring on the stirring shaft is rotatably connected with the stirring shaft, the support ring is fixedly arranged on a rack, and rotating power for driving the stirring shaft is fixedly arranged on the rack. After the stirring shaft stops rotating, the conveying pump keeps working, and the phenomenon that the cooling liquid is too high due to the fact that liquid retained in the inflow pipe and the backflow pipe keeps long-term contact with the stirring shaft is avoided.
Sixthly, through setting up supplementary agitating unit, four actuating levers are articulated each other in proper order, and four pin joints constitute four summits of rhombus, through the angle that changes two adjacent actuating levers to make the mutual conversion of stainless steel thin-walled cylinder between ellipse and circular. Because the stainless steel thin-wall cylinder is immersed into the aluminum liquid, the aluminum liquid far away from the center of the container in the container is disturbed in the shape change process of the stainless steel thin-wall cylinder, so that the aluminum liquid can be fully sheared by the stirring shaft, and the scattered dendritic crystals can be uniformly dispersed. Through setting up supplementary stretch-draw pole for the synchronous deformation along radial of stainless steel thin-walled cylinder keeping in the direction of height.
Compared with the prior art, the cooling liquid is arranged in the stirring shaft for cooling, so that the formation of dendritic crystals is promoted, the formed dendritic crystals are scattered by the stirring shaft for uniform dispersion, and the pulping efficiency of the aluminum alloy melt is greatly improved.
Drawings
FIG. 1 is a diagram of the use state of the semi-solid pulping process of liquid-cooled aluminum alloy.
Fig. 2 is a schematic cross-sectional view of the stirring device extending into the vessel.
FIG. 3 is a schematic cross-sectional view of the stirring shaft and the liquid supply device.
Fig. 4 is an enlarged schematic view of a portion a in fig. 3.
Fig. 5 is an exploded view of the auxiliary stirring mechanism (with the square fixing frame hidden).
Fig. 6 to 8 are schematic top structural views of the auxiliary stirring mechanism when the stainless steel thin-wall cylinder is in different states.
Fig. 9 is a schematic top view of an auxiliary stirring mechanism in which the driving mechanism is the second embodiment.
Fig. 10 is an enlarged schematic view of the structure at B in fig. 9.
In the figure:
a container 100; a manipulator 1;
a stirring shaft 2; an inlet pipe 21; a return pipe 22; a support ring 23; a stirring rod 24;
a liquid supply device 3; a housing 31; a first battery cell 311; a second battery 312; a storage box 32; the first cooling fins 321; a second cooling fin 322; a delivery pump 33; a trim adjustment mechanism 34; a fixed base 341; an adjusting screw 342; a counterweight 343; an adjusting handwheel 344;
a square fixing frame 41; a stainless steel thin-walled cylinder 42; a through hole 421; a first sliding stopper 431; a second sliding stop 432; a third sliding limiting rod 433; a stage mount 434; a drive rod 44; an auxiliary tension rod 45; a drive mechanism 46; a swing rod 461; a pivot hole 462; an electric push rod 463; a mounting base 464; a turntable 465; a slider 466; a slide rail 467; a connecting rod 468; drive link 469.
Detailed Description
In order to further explain the technical solution of the present invention, the present invention is explained in detail by the following specific examples.
As shown in fig. 1 to 10, the liquid-cooled aluminum alloy semi-solid pulping process according to the present invention comprises the following steps:
firstly, a manipulator 1 drives a container 100 to scoop up molten aluminum liquid from an aluminum liquid tank, and moves the container 100 to the lower part of a stirring device, and the lower part of the stirring device is immersed into the aluminum liquid in the container 100;
the stirring device comprises a stirring shaft 2, and the stirring shaft 2 can rotate around a vertical axis; an inflow pipe 21 and a return pipe 22 are arranged in the stirring shaft 2, and the lower parts of the inflow pipe 21 and the return pipe 22 are communicated; when the stirring shaft 2 rotates, cooling liquid flows through the inflow pipe 21 and the return pipe 22;
after the stirring is carried out for the set time, the stirring shaft 2 stops rotating; the robotic arm lowers the container to disengage the stirring device from the container 100.
Thus, according to the liquid-cooled aluminum alloy semi-solid pulping process, the inflow pipe 21 and the return pipe 22 are arranged in the stirring shaft 2, when the stirring shaft 2 rotates to stir, the inflow pipe 21 and the return pipe 22 are filled with cooling liquid, the cooling liquid absorbs heat to take away part of heat, so that dendritic crystals in aluminum liquid are promoted to be formed around the stirring shaft 2, and the formed dendritic crystals are scattered by the stirring shaft 2 after being generated, so that the formed dendritic crystals are uniformly distributed in the aluminum liquid to finish pulping. Compared with the traditional pulping method only by stirring through the stirring shaft 2, the method promotes the formation of dendritic crystals, can disperse the dendritic crystals in time to enable the dendritic crystals to be uniformly distributed, and improves the pulping efficiency.
Further, the upper end of the stirring shaft 2 is connected with a liquid supply device 3 for providing cooling liquid, and the liquid supply device 3 comprises a shell 31, a storage tank 32, a delivery pump 33, a power supply battery and a balancing adjusting mechanism 34; the outer shell 31 is fixedly connected with the upper end of the stirring shaft 2; the storage tank 32 is arranged at the top of the inner cavity of the shell 31, the storage tank 32 is filled with cooling liquid, the delivery pump 33 is arranged at the lower part of the storage tank 32, and the storage tank 32 is connected with the inlet of the delivery pump 33; the outlet of the delivery pump 33 is connected with the inflow pipe 21 of the stirring shaft 2 through a pipeline; the return pipe 22 of the stirring shaft 2 is connected with the storage tank 32 through a pipeline; the power supply storage battery is arranged on the inner wall of the shell 31 and supplies power to the delivery pump 33 through a lead; because the stirring shaft 2 needs to rotate, and simultaneously needs to convey cooling liquid into the inflow pipe 21 and withdraw the cooling liquid from the return pipe 22, the complexity of pipeline design is reduced by arranging the liquid supply device 3 at the upper end of the stirring shaft 2 and rotating along with the stirring shaft 2; the traditional method is that a liquid supply mechanism with an annular flow channel is arranged, so that smooth flowing of cooling liquid can be guaranteed when a stirring shaft rotates, meanwhile, knotting of a pipeline due to rotation of the stirring shaft is avoided, and the structure is complex. In use, the transfer pump 33 pumps the coolant in the storage tank 32 and transfers the coolant to the inlet of the inflow pipe 21 through a pipe, and the transfer pump 33 is disposed at a lower portion of the storage tank 32, so that even if the storage tank 32 is rotated, the transfer pump 33 can maintain smooth suction of the coolant since the inlet of the transfer pump 33 is connected to the lower bottom of the storage tank 32.
The trim adjusting mechanism 34 is disposed at the bottom of the inner cavity of the housing 31, the trim adjusting mechanism 34 includes a fixed seat 341, an adjusting screw rod 342 and a weight block 343, the fixed seat 341 is fixedly connected with the inner wall of the housing 31, the adjusting screw rod 342 is rotatably connected with the fixed seat 341, a threaded hole is formed on the weight block 343, the adjusting screw rod 342 is in threaded connection with the threaded hole, and the weight block 343 is slidably connected with the bottom surface of the inner cavity of the housing 31; the length direction of the adjusting screw rod 342 is vertical to the rotation axis of the stirring shaft 2 and passes through the rotation axis of the stirring shaft 2; one end of the adjusting screw rod 342 is located outside the shell 31, and an adjusting hand wheel 344 is fixedly arranged at one end of the adjusting screw rod 342 located outside the shell 31. Through carrying out the trim adjustment operation to (mixing) shaft 2 and liquid supply device 3 before formal use, when rotating accommodate the lead screw 342, can adjust the distance of balancing weight 343 distance (mixing) shaft 2 axis of rotation for (mixing) shaft 2 and liquid supply device 3 as the focus of whole are on (mixing) shaft 2's axis of rotation, thereby more steady balance when axis of rotation 2 rotates. Since the adjusting hand wheel 344 is arranged outside the shell 31, the user can conveniently rotate and adjust the adjusting hand wheel.
Preferably, a refrigerating piece is arranged in the storage box 32 and connected with the power supply storage battery through a conducting wire. By arranging the refrigerating fins in the storage tank 32, the heated cooling liquid can be cooled, and the cooling liquid is kept within a proper working temperature range. The volume of the storage tank 32 and the amount of the cooling liquid stored in the storage tank 32 can be designed and adjusted as required, and the cooling effect of the cooling liquid can be guaranteed.
Preferably, a first storage battery 311 and a second storage battery 312 are arranged in the housing 31, the mass and the electric storage capacity of the first storage battery 311 are greater than those of the second storage battery 312, a first refrigeration piece 321 and a second refrigeration piece 322 are arranged in the storage box 32, and the first storage battery 311 is connected with the delivery pump 33 and the first refrigeration piece 321 through conducting wires; the second storage battery 312 is connected with the second refrigeration sheet 322 through a conducting wire; the first battery 311 and the second battery 312 are respectively positioned at two sides of the inner cavity of the shell 31 and are oppositely spaced from the rotation axis of the stirring shaft 2 by 180 degrees; the trim adjustment mechanism 34 is located below the second battery 312. The weights of the first storage battery 311 and the second storage battery 312 are different, the balance adjusting mechanism 34 and the second storage battery 312 are located on the same side, the first storage battery 311 is located on the other side, the self weight of the first storage battery 311 is approximately equal to that of the second storage battery 312 and the balance adjusting mechanism 34, the two sides are approximately balanced firstly, and then fine adjustment is carried out through position change of the balancing weight 343.
Preferably, the step (i) further comprises leveling operation, namely rotating the stirring shaft 2 and starting the delivery pump 33, and rotating the adjusting hand wheel 344 to adjust the position of the balancing weight 343 according to the shaking condition of the stirring shaft 2 until the stirring shaft 2 rotates stably; after the stirring shaft 2 is used for a period of time, the residual aluminum liquid on the stirring shaft 2 is cleaned regularly and the leveling operation is carried out again. So keep the balance of (mixing) shaft 2 long-term use, reduce the resistance and the energy consumption of (mixing) shaft 2.
Preferably, the stirring shaft 2 is provided with a support ring 23 for supporting the stirring shaft 2, the stirring shaft 2 is rotatably connected to the support ring 23, the stirring shaft 2 is further provided with a power mechanism (not shown in the figure) for driving the stirring shaft 2 to rotate, and the power mechanism can be a common driving form such as a motor driving the stirring shaft 2 to rotate. The support ring 23 on the stirring shaft 2 is rotatably connected with the stirring shaft 2, the support ring 23 is fixedly arranged on a rack, and the rack is fixedly provided with rotating power for driving the stirring shaft 2.
Preferably, the stirring shaft 2 is formed with a stirring rod 24 extending in a radial direction. By providing the stirring rod 24, the shearing effect of the stirring shaft 2 is increased, so that the formed dendrites are better scattered.
Preferably, in the third step, after the stirring shaft 2 stops rotating, the transfer pump 33 still works for a period of time. After the stirring shaft 2 stops rotating, the delivery pump 33 keeps working, and the phenomenon that the temperature of the cooling liquid is too high due to the fact that the liquid staying in the inflow pipe 21 and the return pipe 22 keeps long-term contact with the stirring shaft 2 is avoided.
Preferably, the stirring device further comprises an auxiliary stirring mechanism, wherein the auxiliary stirring mechanism comprises a square fixing frame 41, a stainless steel thin-wall cylinder 42, a first sliding limiting rod 431, a second sliding limiting rod 432, a third sliding limiting rod 433, four driving rods 44 and a driving mechanism 46; the square fixing frame 41 is also fixed on a machine frame (not shown in the figure); the free-state section of the stainless steel thin-wall cylinder 42 is circular, a plurality of through holes 421 are distributed on the stainless steel thin-wall cylinder 42, aluminum liquid passes through the through holes 421, a first sliding limiting rod 431, a second sliding limiting rod 432 and a third sliding limiting rod 433 are respectively connected to the outer wall of the stainless steel thin-wall cylinder 42, the second sliding limiting rod 432, the first sliding limiting rod 431 and the third sliding limiting rod 433 form an included angle of 90 degrees, and the first sliding limiting rod 431 and the third sliding limiting rod 433 are located on the same straight line; the outer wall of the stainless steel thin-wall barrel 42 is further provided with a step seat 434, and the step seat 434 is positioned on the outer wall of the stainless steel thin-wall barrel 42 opposite to the second sliding limiting rod 432; the step seat 434, the first sliding limiting rod 431, the second sliding limiting rod 432 and the third sliding limiting rod 433 are positioned on the same horizontal plane, driving rods 44 are hinged between adjacent limiting rods or between adjacent limiting rods and the step seat 434, and four driving rods 44 surround to form a closed annular structure; the first sliding limiting rod 431, the second sliding limiting rod 432 and the third sliding limiting rod 433 are arranged on three sides of the square fixing frame 41 in a sliding manner; the driving rod 44 is connected with a driving mechanism 46 for changing the angle of two adjacent driving rods 44; the stainless steel thin-walled cylinder 42 cyclically changes among a first circular state, a first elliptical state, a second circular state and a second elliptical state, wherein the elliptical length of the first elliptical state is along the direction of the second sliding limiting rod 432, and the elliptical long axis of the second elliptical state is along the direction of the first sliding limiting rod 431.
Preferably, the distance between the two hinge points of each driving rod 44 is equal, each driving rod is arc-shaped, and the corresponding central angle is 90 degrees; through setting up supplementary agitating unit, four actuating levers 44 articulate each other in proper order, and four pin joints constitute four summits of rhombus, through changing the angle of two adjacent actuating levers 44 to make stainless steel thin-walled cylinder 42 interconvert between ellipse and circular. Because the stainless steel thin-wall cylinder 42 is immersed in the aluminum liquid, the aluminum liquid far away from the center of the container 100 in the container 100 is disturbed in the shape change process of the stainless steel thin-wall cylinder 42, so that the aluminum liquid can be fully sheared by the stirring shaft 2, and the scattered dendritic crystals can be uniformly dispersed.
Preferably, the thickness of the stainless steel thin-wall cylinder 42 is 0.5-1.5mm, preferably 0.5mm or 0.8mm or 1mm or 1.5mm, and the stainless steel thin-wall cylinder 42 is made of stainless steel material which has good toughness and is easy to rebound but not easy to break after being bent, such as stainless steel material similar to band saw. The diameter of the circle formed by the stainless steel thin-wall cylinder 42 in the free state is 150-200mm, preferably 180mm, and the thickness of the stainless steel thin-wall cylinder 42 with the large diameter can be set to be thicker, so that the strength during reciprocating deformation is ensured. The height of the stainless steel thin-walled cylinder 42 in the vertical direction is not more than 300mm, preferably 180 and 200mm, for example, the diameter and the height are both 180 mm.
Preferably, the step seat 434, the first sliding limiting rod 431, the second sliding limiting rod 432 and the third sliding limiting rod 433 are all formed with an auxiliary tension rod 45 extending downwards, and the auxiliary tension rod 45 is attached to the outer wall of the stainless steel thin-walled cylinder 42. The auxiliary tension rod 45 is arranged, so that the stainless steel thin-wall cylinder 42 in the height direction keeps synchronous deformation along the radial direction.
As the first embodiment of the driving mechanism 46, it is preferable that two adjacent driving rods 44 are fixedly provided with a swinging rod 461, one end of the swinging rod 461, which is far away from the driving rod 44, is provided with a pivot hole 462, and the movable rods of two electric push rods 463 with mutually connected tails are respectively hinged with the pivot holes 462 of the two swinging rods 461; the two electric push rods 463 are simultaneously extended or simultaneously retracted to change the angle between the two swing links 461.
As a second embodiment of the driving mechanism 46, as shown in fig. 9 and 10, the driving mechanism 46 includes a mounting base 464, a rotating plate 465, a sliding block 466, a sliding rail 467, a connecting rod 468 and a transmission rod 469, wherein the mounting base 464 is fixedly connected with the square fixing frame 41; the rotary plate 465 is rotatably connected to the mounting base 464, the sliding rails 467 are fixedly arranged on the mounting base 464, the length direction of the sliding rails 467 is along the sliding direction of the second sliding limiting rod 432, the sliding block 466 is slidably arranged at the edge of the rotary plate 465 and rotatably connected with a connecting rod 468, one end, away from the rotary plate 465, of the connecting rod 468 is rotatably connected with the sliding block 466, along with the rotation of the rotary plate 465, for example, the motor drives the rotary plate 465 to rotate, the sliding block 466 reciprocally slides on the sliding rails 467, the sliding block 466 is connected with a transmission rod 469, and one end, away from the sliding block 466, of the transmission rod 469 is rotatably connected with the connection position of the two driving rods 44 above the step seat 434. The slide block 466 reciprocating on the slide rail 467 drives the transmission rod 469 to move, so that the angle between the driving rods 44 is changed, and the stainless steel thin-wall cylinder 42 reciprocates between an ellipse, a circle and an ellipse, so that the aluminum liquid close to the inner wall part of the container is disturbed.
Compared with the prior art, the cooling liquid is arranged in the stirring shaft 2 for cooling, so that the formation of dendritic crystals is promoted, the formed dendritic crystals are scattered by the stirring shaft 2 for uniform dispersion, and the pulping efficiency of the aluminum alloy melt is greatly improved.
The above embodiments and drawings are not intended to limit the form and style of the present invention, and any suitable changes or modifications thereof by those skilled in the art should be considered as not departing from the scope of the present invention.
Claims (10)
1. A liquid-cooled aluminum alloy semi-solid pulping process is characterized by comprising the following steps:
firstly, a manipulator drives a container to scoop up molten aluminum from an aluminum liquid tank, and moves the container to the lower part of a stirring device, and the lower part of the stirring device is immersed into the aluminum liquid in the container;
the stirring device comprises a stirring shaft, and the stirring shaft can rotate around a vertical axis; an inflow pipe and a return pipe are arranged in the stirring shaft, and the inflow pipe is communicated with the lower part of the return pipe; while the stirring shaft rotates, cooling liquid flows through the inflow pipe and the return pipe;
thirdly, after stirring for a set time, stopping rotation of the stirring shaft; the robotic arm lowers the container to disengage the stirring device from the container.
2. The liquid-cooled aluminum alloy semi-solid pulping process according to claim 1, wherein a liquid supply device for providing cooling liquid is connected to the upper end of the stirring shaft, and the liquid supply device comprises a shell, a storage tank, a delivery pump, a power supply battery and a balancing adjustment mechanism; the shell is fixedly connected with the upper end of the stirring shaft; the storage box is arranged at the top of the inner cavity of the shell, cooling liquid is filled in the storage box, the delivery pump is arranged at the lower part of the storage box, and the storage box is connected with an inlet of the delivery pump; the outlet of the conveying pump is connected with the inflow pipe of the stirring shaft through a pipeline; the return pipe of the stirring shaft is connected with the storage tank through a pipeline; the power supply storage battery is arranged on the inner wall of the shell and supplies power to the delivery pump through a lead; the balancing adjusting mechanism is arranged at the bottom of the inner cavity of the shell and comprises a fixed seat, an adjusting screw rod and a balancing weight, the fixed seat is fixedly connected with the inner wall of the shell, the adjusting screw rod is rotatably connected with the fixed seat, a threaded hole is formed in the balancing weight, the adjusting screw rod is in threaded connection with the threaded hole, and the balancing weight is in sliding connection with the bottom surface of the inner cavity of the shell; the length direction of the adjusting screw rod is perpendicular to the rotation axis of the stirring shaft and penetrates through the rotation axis of the stirring shaft; one end of the adjusting screw rod is positioned outside the shell, and one end of the adjusting screw rod, which is positioned outside the shell, is fixedly provided with an adjusting hand wheel.
3. The liquid-cooled semi-solid pulping process for aluminum alloy according to claim 2, wherein a refrigerating sheet is arranged in the storage box, and the refrigerating sheet is connected with the power supply battery through a wire.
4. The liquid-cooled semi-solid pulping process for aluminum alloy according to claim 3, wherein a first battery cell and a second battery cell are arranged in the casing, the mass and the electric storage capacity of the first battery cell are larger than those of the second battery cell, a first refrigerating sheet and a second refrigerating sheet are arranged in the storage box, and the first battery cell is connected with the delivery pump and the first refrigerating sheet through wires; the second storage battery is connected with the second refrigerating sheet through a lead; the first battery jar and the second battery jar are respectively positioned at two sides of the inner cavity of the shell and are oppositely spaced from the rotating axis of the stirring shaft by 180 degrees; and the balancing adjusting mechanism is positioned below the second storage battery.
5. The liquid-cooled aluminum alloy semi-solid pulping process according to claim 2, wherein the step (i) is preceded by a leveling operation, wherein the stirring shaft is rotated and the delivery pump is started, and the adjusting handwheel is rotated to adjust the position of the counterweight block according to the shaking condition of the stirring shaft until the stirring shaft rotates stably; after the stirring shaft is used for a period of time, the residual aluminum liquid on the stirring shaft is periodically cleaned and the leveling operation is carried out again.
6. The liquid-cooled semi-solid pulping process for aluminum alloy according to claim 1, wherein the stirring shaft is provided with a support ring for supporting the stirring shaft, the stirring shaft is rotatably connected with the support ring, and the stirring shaft is further provided with a power mechanism for driving the stirring shaft to rotate.
7. The liquid-cooled semi-solid pulping process of aluminum alloy according to claim 1, wherein the stirring shaft is formed with a stirring rod extending in a radial direction.
8. The liquid-cooled semi-solid aluminum alloy pulping process according to claim 1, wherein the transfer pump is operated for a period of time after the stirring shaft stops rotating in step (iii).
9. The liquid-cooled aluminum alloy semi-solid pulping process according to claim 1, wherein the stirring device further comprises an auxiliary stirring mechanism, wherein the auxiliary stirring mechanism comprises a square fixing frame, a stainless steel thin-wall cylinder, a first sliding limiting rod, a second sliding limiting rod, a third sliding limiting rod, four driving rods and a driving mechanism; the section of the stainless steel thin-wall cylinder in a free state is circular, a plurality of through holes are distributed on the stainless steel thin-wall cylinder, a first sliding limiting rod, a second sliding limiting rod and a third sliding limiting rod are respectively connected to the outer wall of the stainless steel thin-wall cylinder, the second sliding limiting rod, the first sliding limiting rod and the third sliding limiting rod form an included angle of 90 degrees, and the first sliding limiting rod and the third sliding limiting rod are located on the same straight line position; the outer wall of the stainless steel thin-wall cylinder is also provided with a step seat, and the step seat is positioned on the outer wall of the stainless steel thin-wall cylinder opposite to the second sliding limiting rod; the step seat, the first sliding limiting rod, the second sliding limiting rod and the third sliding limiting rod are positioned on the same horizontal plane, driving rods are hinged between the adjacent limiting rods and the limiting rods or between the limiting rods and the step seat, and the four driving rods form a closed annular structure; the first sliding limiting rod, the second sliding limiting rod and the third sliding limiting rod are arranged on three edges of the square fixing frame in a sliding mode; the driving rods are connected with a driving mechanism for changing the angles of two adjacent driving rods; the stainless steel thin-wall cylinder changes cyclically among a first circular state, a first elliptical state, a second circular state and a second elliptical state, the length of the ellipse in the first elliptical state is along the direction of the second sliding limiting rod, and the long axis of the ellipse in the second elliptical state is along the direction of the first sliding limiting rod.
10. The liquid-cooled semi-solid pulping process for aluminum alloy according to claim 9, wherein auxiliary tension rods extending downwards are formed on the step seat, the first sliding limiting rod, the second sliding limiting rod and the third sliding limiting rod, and the auxiliary tension rods are attached to the outer wall of the stainless steel thin-walled cylinder.
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