Scrap processing device for secondary aluminum casting

Abstract

The invention provides a scrap processing device for secondary aluminum casting, and relates to the field of secondary aluminum casting. The scrap processing device for secondary aluminum casting comprises a support and a box body fixed to the support, an aluminum solution is contained in the box body, a feeding port, a collecting area and an impurity removing area which are sequentially communicated are arranged in the box body, and two filter plates which are arranged in a staggered mode are installed in the box body; according to the scrap processing device for secondary aluminum casting, the two filter plates are arranged in an inclined and staggered mode, various impurities in a solution are more effectively removed, meanwhile, the staggered structure can effectively delay the blocking speed of the filter plates, in the rising process of bubbles in the solution, the impurities can be better dispersed and promoted to be attached to the surfaces of the bubbles, and therefore the bubbles are more effectively removed. And then bubbles carrying impurities float to the filter plates and are intercepted by the obliquely staggered filter plates, so that the probability that the impurities are captured and removed is greatly improved through the synergistic effect of the bubbles and the filter plates, and the impurities from small particles to large particles in the aluminum solution are comprehensively removed.

Description

Technical Field

[0001] The invention relates to the field of recycled aluminum casting, in particular to a chip processing device for recycled aluminum casting. Background Art

[0002] Recycled aluminum casting refers to the process of remelting recycled scrap aluminum products (such as scrap auto parts, aluminum alloy doors and windows for construction, discarded cans, etc.) into molten aluminum. After a series of treatments, the molten aluminum is made into various aluminum products through a casting process. It is necessary to collect various scrap aluminum sources first. These scrap aluminum materials have complex compositions and may contain different alloy components and impurities (including metal impurities such as iron, copper, etc., and non-metallic impurities such as oil, plastic, paint, etc.). Before processing the metal scraps, these scrap aluminum need to be pre-processed, such as through disassembly, sorting, cleaning, crushing and other operations to remove some obvious impurities, such as removing rubber tubes and plastic parts attached to aluminum parts of scrap automobile engines, to improve the purity of scrap aluminum materials.

[0003] In the existing chip processing device for recycled aluminum casting, during the processing, the aluminum chips need to be melted and an aluminum solution is formed, and the aluminum solution is removed by filtering and removing impurities. The existing filter screen or filter membrane is used as a filter medium, and impurities are intercepted according to the difference in size between impurity particles and aluminum ions or aluminum particles in the aluminum solution. When the aluminum solution passes through the filter medium, solid impurities larger than the pore size of the filter medium are retained on the surface of the filter medium, thereby achieving separation of the aluminum solution and impurities. For example, ceramic foam filters and glass fiber filters are used. These filters have many tiny pores. When aluminum melt passes through, larger particles of impurities (such as oxides and inclusions) will be intercepted on the filter surface. For example, the porosity of the ceramic foam filter can reach 70%-90%, which can effectively remove impurities larger than the pore size of the filter.

[0004] In the above-mentioned filtering method, although it can effectively remove impurities larger than the filter pore size and can filter out impurities larger than tens of microns in size, it has a poor removal effect on some impurity particles with smaller particle sizes in the solution, especially those tiny impurities that are difficult to physically intercept through the filter (such as particles of tens of microns or even smaller). In addition, the filtering speed of the filter depends on the resistance of the filter medium to the liquid. When the filter medium (such as filter paper, filter screen or filter membrane) intercepts impurities, the impurities will gradually accumulate on the surface of the medium or in the internal pores, increasing the resistance to the passage of the liquid. As the filtering process proceeds, the filtering speed will gradually decrease. When a large amount of solution is processed at the same time, it will take a long time to complete the filtering process. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a chip processing device for recycled aluminum casting, which solves the problems raised in the above background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a chip processing device for recycled aluminum casting, comprising a bracket and a box body fixed on the bracket, the box body is used to load aluminum solution, the box body is provided with a feed port, a collection area and a decontamination area connected in sequence, two staggered filter plates are installed inside the box body, a gap is left between the two filter plates, and a circulation device for circulating the aluminum solution in the box body is installed on the side of the box body.

[0007] A base is fixedly installed at the bottom of the box body, and an outer ball for rotation is rotatably installed in the slot of the base. A discharge port, a plurality of bubble holes A and a plurality of bubble holes B are provided on the outer surface of the outer ball. The aperture of bubble hole A is larger than the aperture of bubble hole B. The axis center lines of each bubble hole A and bubble hole B point to the center of the outer ball in the radial direction. An inner ball for air intake is installed in the outer ball. The inner ball and the outer ball are concentrically arranged. A discharge hole is provided at the bottom end of the inner ball. A concave filter screen is fixedly installed in the notch of the inner ball. The convex structure at the upper end of the inner ball is matched with the inner wall of the outer ball, and the two are in close contact. A cleaning mechanism for cleaning impurities in the filter screen is installed on one side of the base, and a discharge pipe for discharging aluminum solution is installed at the bottom of the base.

[0008] Preferably, both side surfaces of the two filter plates are in close contact with the inner wall of the box body, and the upper ends of the two filter plates are fixedly connected with fixing members, which are fixed to the box body by screws.

[0009] Preferably, the bottom ends of the two filter plates are bent and have a hook shape.

[0010] Preferably, the two filter plates are arranged at an angle, and the inclined surfaces of the two filter plates are used for installing filter cloths.

[0011] Preferably, a stirrer for rotation is installed inside the box.

[0012] Preferably, the circulation device includes an inlet pipe A, an inlet pipe B, an outlet pipe, a tee and a water pump, the two ends of the inlet pipe A are respectively connected to the box body and the water delivery end of the water pump, the water pump is fixed to the side of the box body, the three ends of the tee are respectively connected to the box body, the inlet pipe B and the outlet pipe, the other end of the outlet pipe is connected to the water inlet end of the water pump, and solenoid valves are installed at both ends of the tee.

[0013] Preferably, the cleaning mechanism includes a pump body, a slag inlet pipe and a slag discharge pipe, the pump body is fixed to the base, the inlet end and the outlet end of the pump body are connected to the slag inlet pipe and the slag discharge pipe respectively, the slag inlet pipe is fixed to the filter screen, the bottom of the filter screen is provided with a through hole, the through hole is connected to the slag inlet pipe, the slag discharge pipe is rotatably connected to the outer ball, and is fixedly connected to the inner ball and the base, and a valve B is installed at one end of the slag discharge pipe.

[0014] Preferably, a rotating drum is rotatably installed inside the base, the rotating drum is fixed to the outer ball, a driving shaft is rotatably installed on one side of the base, the outer surface of the rotating drum and the outer surface of the driving shaft are fixedly connected with gears, the two gears are meshed and connected, and the driving shaft is driven to rotate by an external power source.

[0015] Preferably, the outer surface of the inner ball is connected to an air inlet cylinder, the rotating cylinder is rotatably connected to the air inlet cylinder, and a sealing ring is installed between the two, a gas generator is installed on one side of the box body, the air outlet end of the gas generator is connected to an air supply pipe, and the air supply pipe is connected to the air inlet cylinder.

[0016] Preferably, an arc-shaped scraper is fixedly embedded on the upper surface of the base, and the scraper is adapted to the outer surface of the outer ball and the two are in contact.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The chip processing device for recycled aluminum casting has two filter plates that are inclined and staggered. When the aluminum solution flows through, the double interception of the two filter plates improves the ability to capture impurities of different sizes, more effectively removes various impurities in the solution, and improves the purity of the aluminum solution. The inclined filter plates prevent impurities from concentrating on a fixed area on the surface of the filter plates, but gradually deposit along the inclined surface of the inclined filter plates. At the same time, the staggered structure can effectively delay the speed of filter plate blockage, extend the effective filtration cycle of the filter plates, reduce the number of frequent replacement of filter plates, improve filtration efficiency, and reduce the problem of long impurity removal time caused by blockage. By setting the bubble holes A and bubble holes B at the outer sphere, the bubbles generated can better disperse the impurities and cause them to adhere to the bubble surface during the rising process in the solution. When the bubbles carrying impurities float to the filter plates, they will be intercepted by the inclined and staggered filter plates. The synergistic effect of the two greatly improves the probability of impurities being captured and removed, and realizes the comprehensive removal of impurities from tiny particles to larger particles in the aluminum solution.

[0019] 2. The scrap processing device for recycled aluminum casting adopts a combination of reagents and precipitation filtration to effectively solve the problem that lyophilic impurities in aluminum solution are difficult to remove. For metal ions in lyophilic impurities, sodium sulfide and reagents are added to form insoluble compound precipitation, and then inclined and staggered filter plates are used to double intercept the precipitation and other particulate impurities. Whether it is large particle impurities, tiny particle impurities or impurity agglomerates, they can be efficiently captured and removed, greatly improving the purity of the aluminum solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a front view of the box body of the present invention;

[0021] Figure 2 This is a rear view of the box of the present invention;

[0022] Figure 3 It is a cross-sectional view of the front view of the box body of the present invention;

[0023] Figure 4 It is a cross-sectional view of the front view of the base, inner ball and outer ball of the present invention;

[0024] Figure 5 It is a cross-sectional view of the front view of the box body of the present invention;

[0025] Figure 6 It is a front view of the outer ball of the present invention;

[0026] Figure 7 It is the rear view of the outer ball of the present invention;

[0027] Figure 8 It is a schematic diagram of the filter plate structure of the present invention;

[0028] Fig. 9 A top view of the base and the outer ball of the present invention;

[0029] Fig.10 A cross-sectional view of the base and the outer ball side view of the present invention;

[0030] Fig.11 It is a cross-sectional view of the inner ball and the side view of the filter screen of the present invention.

[0031] Among them: 1. bracket; 2. box body; 201. feed port; 202. collection area; 203. impurity removal area; 3. filter plate; 4. circulation device; 401. liquid inlet pipe A; 402. liquid inlet pipe B; 403. liquid outlet pipe; 404. three-way pipe; 405. solenoid valve; 5. base; 6. outer ball; 601. sealing shell; 602. bubble shell; 603. discharge shell; 7. discharge port; 8. bubble hole A; 9. bubble hole B; 10. inner ball; 11. discharge hole; 12. filter screen; 13. cleaning mechanism; 131. slag inlet pipe; 132. slag discharge pipe; 14. discharge pipe; 15. fixing parts; 16. agitator; 17. drum; 18. driving shaft; 19. air inlet cylinder; 20. air pipe; 21. scraper. DETAILED DESCRIPTION

[0032] like Figure 1-Figure 11As shown, a chip processing device for recycled aluminum casting includes a bracket 1 and a box 2 fixed on the bracket 1. The box 2 is used to load aluminum solution made of metal scraps. The box 2 is provided with a feed port 201, a collection area 202 and a de-impurity area 203 which are connected in sequence. The feed port 201 is used to put reagents into the de-impurity area 203, such as adding a proper amount of sodium sulfide. For lyophilic impurities, sodium sulfide reacts with metal ion impurities to form insoluble metal compound precipitation. A closed cover is installed at the feed port 201. There are two collecting areas 202, which are used to collect impurities. The de-impurity area 203 is used to remove impurities from the aluminum solution. A stirrer 16 for rotation is installed inside the box 2. The stirrer 16 is used to mix and stir the reagents and the aluminum solution. Two staggered filter plates 3 are installed inside, with a gap between the two filter plates 3 to allow the aluminum solution to pass through the gap and flow to the bottom of the box body 2. The two side surfaces of the two filter plates 3 are in close contact with the inner wall of the box body 2. The upper ends of the two filter plates 3 are fixedly connected with fixing parts 15, and the fixing parts 15 are fixed to the box body 2 by screws, so as to fix the position of the filter plates 3 and facilitate the disassembly of the filter plates 3. The bottom ends of the two filter plates 3 are bent and hook-shaped to collect filtered impurities. The two filter plates 3 are tilted, and the inclined surfaces of the two filter plates 3 are used to install filter cloth. The melting point of aluminum solution is relatively high. The temperature may reach about 700-800°C during smelting and some processing processes. The filter cloth should be made of ceramic fiber material so that the filter cloth does not break at high temperatures. It will melt or decompose, and can maintain the integrity of its physical structure during the filtration of the aluminum solution, thereby effectively intercepting impurities. The angle between the inclined surface of the filter plate 3 and the upper surface of the box body 2 does not exceed sixty degrees. A circulation device 4 for circulating the aluminum solution in the box body 2 is installed on the side of the box body 2. The circulation device 4 includes an inlet pipe A401, an inlet pipe B402, an outlet pipe 403, a three-way pipe 404 and a water pump. The two ends of the inlet pipe A401 are respectively connected to the box body 2 and the water delivery end of the water pump. The water pump is fixed to the side of the box body 2. The three ends of the three-way pipe 404 are respectively connected to the box body 2, the inlet pipe B402 and the outlet pipe 403. The other end of the outlet pipe 403 is connected to the water inlet end of the water pump. Both ends of the three-way pipe 404 are installed with electromagnetic valves 4 05. The other end of the liquid inlet pipe B402 is used to be inserted into an external container containing aluminum solution. When the water pump is started, the solenoid valve 405 close to the box 2 is closed, and the solenoid valve 405 close to the liquid inlet pipe B402 is opened, so that the aluminum solution in the external container passes through the liquid inlet pipe B402, the three-way pipe 404, the liquid outlet pipe 403, the water pump, and the liquid inlet pipe A401 in turn, and is finally injected into the box 2. When the aluminum solution in the box 2 needs to be circulated, the solenoid valve 405 close to the box 2 needs to be opened, and the solenoid valve 405 close to the liquid inlet pipe B402 is closed. By allowing the aluminum solution at the bottom of the box 2 to pass through the three-way pipe 404, the liquid outlet pipe 403, the water pump, and the liquid inlet pipe A401 in turn, and finally be injected into the upper part of the box 2, the circulation of the aluminum solution is realized to improve the impurity removal effect.

[0033] A detachable base 5 is fixedly installed at the bottom of the box body 2, and a rotating drum 17 is rotatably installed inside the base 5. The rotating drum 17 is fixed to the outer ball 6. A driving shaft 18 is rotatably installed on one side of the base 5. Gears are fixedly connected to the outer surfaces of the rotating drum 17 and the outer surfaces of the driving shaft 18. The two gears are meshed and connected. The driving shaft 18 is driven to rotate by an external power source, thereby realizing the rotation of the outer ball 6. The outer ball 6 for rotation is rotatably installed in the slot of the base 5. An arc-shaped scraper 21 is fixedly inlaid on the upper surface of the base 5. The scraper 21 is adapted to the outer surface of the outer ball 6, and the two are in contact. When the outer ball 6 rotates, the two scrapers 21 can scrape impurities on the surface of the outer ball 6 to prevent the impurities from clogging the bubble holes A of the outer ball 6. 8 and bubble holes B9, the outer surface of the outer ball 6 is provided with a discharge port 7, a plurality of bubble holes A8 and a plurality of bubble holes B9, the aperture of the bubble hole A8 is larger than the aperture of the bubble hole B9, and the axis of each bubble hole A8 and the bubble hole B9 points to the center of the outer ball 6 in the radial direction, wherein the radial direction is the direction extending from the positions of the plurality of bubble holes A8 and the plurality of bubble holes B9 to the center of the outer ball 6 with the center of the outer ball 6 as the reference, the outer ball 6 includes a sealing shell 601, a bubble shell 602 and a discharge shell 603, and the three are integrally formed to form a spherical outer ball 6, an inner ball 10 for air intake is installed in the outer ball 6, the inner ball 10 is concentrically arranged with the outer ball 6, and the outer surface of the inner ball 10 is connected with an air intake cylinder 19 The rotating drum 17 is rotatably connected with the air inlet cylinder 19, and a sealing ring is installed between the two. A gas generator is installed on one side of the box body 2. The gas outlet end of the gas generator is connected with a gas pipe 20, and the gas pipe 20 is connected with the air inlet cylinder 19. The gas generator can generate the required gas on site, and the gas is transported to the inner ball 10 through the gas generator. Finally, the bubbles can be discharged from a plurality of bubble holes A8 or a plurality of bubble holes B9. A discharge hole 11 is provided at the bottom end of the inner ball 10, and a concave filter screen 12 is fixedly installed in the notch of the inner ball 10. The convex structure at the upper end of the inner ball 10 is adapted to the inner wall of the outer ball 6, and the two are in close contact. A cleaning mechanism 13 for cleaning impurities in the filter screen 12 is installed on one side of the base 5. The cleaning mechanism 13 includes a pump body, a slag inlet pipe 131 and a slag discharge pipe 132. The pump body is fixed to the base 5. The inlet end and the outlet end of the pump body are respectively connected to the slag inlet pipe 131 and the slag discharge pipe 132. The slag inlet pipe 131 is fixed to the filter screen 12. The bottom of the filter screen 12 is provided with a through hole, which is connected to the slag inlet pipe 131. The slag discharge pipe 132 is rotatably connected to the outer ball 6 and is fixedly connected to the inner ball 10 and the base 5. A valve B is installed at one end of the slag discharge pipe 132. By opening the valve and starting the pump body, the sediment inside the filter screen 12 can be discharged from the slag discharge pipe 132. A discharge pipe 14 for discharging aluminum solution is installed at the bottom of the base 5. The outlet of the base 5 is connected to the discharge pipe 14. A valve A is installed at one end of the discharge pipe 14.

[0034] When in use, first inject the aluminum solution for recycled aluminum casting into the box body 2, open the closed covers of the two feed ports 201, and pour the aluminum solution into the box body 2 through the feed port 201, or insert the liquid inlet pipe B402 into the container containing the aluminum solution, and then start the water pump. At this time, close the solenoid valve 405 close to the box body 2, and open the solenoid valve 405 close to the liquid inlet pipe B402, so that the aluminum solution in the external container passes through the liquid inlet pipe B402, the three-way pipe 404, the liquid outlet pipe 403, the water pump, and the liquid inlet pipe A401 in turn, and finally injects into the box body 2. It should be noted that aluminum waste is collected from various channels for classification. For some complex aluminum waste, such as automobile engine aluminum parts or aluminum products with other materials such as plastic and rubber, they need to be disassembled to separate aluminum from other materials to reduce impurities in subsequent processing. For example, aluminum radiators are removed from waste automobile radiators. and copper tubes, only retaining the aluminum part, and then cleaning the aluminum scrap to remove surface oil, dust, paint and other pollutants. A combination of cleaning and physical cleaning can be used. Cleaning uses alkaline or acidic cleaning agents. For example, sodium hydroxide solution is used to clean aluminum scrap with heavy oil pollution. Physical cleaning includes mechanical stirring and high-pressure water gun flushing to remove stubborn impurities attached to the aluminum surface. The aluminum scrap is crushed or cut into smaller blocks or particles for subsequent smelting. A crusher can be used for crushing. For large aluminum structural parts, cutting processing is required to make the size of the aluminum scrap meet the feeding requirements of the smelting furnace. For example, the waste aluminum alloy doors and windows are cut into small pieces with a side length of several centimeters, which are convenient for putting into the smelting furnace. The pre-treated aluminum scrap is loaded into the smelting furnace. The smelting furnace can be an oil-fired furnace or an electric furnace. According to the type and capacity of the smelting furnace, the loading amount is reasonably controlled to ensure that the aluminum scrap can be fully heated and melted to finally form an aluminum solution.

[0035] Next, the reagent is fed into the impurity removal zone 203 through the feed port 201. Since the lyophilic impurities have a strong dissolving tendency in the aluminum solution and can form a relatively stable solvation layer with the aluminum solution, the molecules or ions are evenly dispersed in the solution system. For example, some metal ion impurities, such as magnesium ions and zinc ions, will be surrounded by solvent molecules in the aluminum solution to form hydrated ions. The interaction between these ions and the solvent makes it difficult to remove them by simple filtering, because filtering is mainly to intercept solid particles, while ions in dissolved state can freely pass through the filter medium, and some tiny particles in the lyophilic impurities, The particle size may be very small, reaching the nanometer or submicron level. The pore size of traditional filters is relatively large and cannot effectively intercept these tiny particles. For example, when the particle size of the impurity particles is smaller than the pore size of the filter, these particles will pass through the filter paper smoothly with the solution, and it is impossible to filter and remove impurities. Therefore, for lyophilic impurities, a reagent such as adding an appropriate amount of sodium sulfide is added. Sodium sulfide reacts with metal ion impurities to form an insoluble metal compound precipitate. At the same time, the reagent and the aluminum solution are stirred by the rotation of two agitators 16 so that the reagent and the aluminum solution can be fully stirred. The agitator 16 can be driven to rotate by an external motor.

[0036] Next, filter cloths can be installed on the inclined surfaces of the two filter plates 3. The filter cloths can filter large particles of impurities in the aluminum solution and block most of the precipitation. Since the filter plates 3 are inclined, these impurities and precipitation will sink along the filter cloths at the inclined surfaces of the filter plates 3 and fall to the curved part at the bottom of the filter plates 3. Since the bottom of the filter plates 3 is hook-shaped, it is easier to collect impurities and precipitation. It should be noted that due to the high melting point of the aluminum solution, the temperature may reach about 700-800°C during smelting and some processing processes. The filter cloth should be made of ceramic fiber material so that the filter cloth will not melt or decompose at high temperatures, and can maintain the integrity of its physical structure during the filtration of the aluminum solution, thereby effectively intercepting impurities.

[0037] Next, since the bottom of the filter plate 3 is hook-shaped and staggered, when the aluminum solution flows through, the larger particles of the particulate impurities will be intercepted when they flow through the first filter plate 3, while the smaller particles will continue to flow along the edge of the filter plate 3 or through the pores of the first filter plate 3. The staggered second filter plate 3 will intercept these leaked small particles again. This double interception mechanism is similar to multi-stage filtration, which can effectively improve the ability to capture impurities of different sizes, especially for those impurity particles whose sizes are between the apertures of the two filter plates 3, greatly reducing the probability of impurities passing through. In the aluminum solution, impurities sometimes agglomerate with each other to form larger agglomerates. The staggered filter plate 3 structure can better intercept these agglomerates, even if the shape of the agglomerates is irregular or when the solution flows through The filter plate 3 is deformed during the process, and the hook-shaped bottom and the staggered structure of the filter plate 3 can also block it from multiple directions to prevent it from passing through the filter plate 3 smoothly. Due to the gap between the two filter plates 3, part of the aluminum solution will flow to the bottom of the box 2 through the gap to prevent the aluminum solution from being blocked prematurely at the filter cloth of the filter plate 3, thereby improving the impurity removal efficiency. At the same time, the aluminum solution at the bottom of the box 2 can be circulated to the upper part of the box 2 through the circulation device 4. When starting the water pump, it is necessary to open the solenoid valve 405 close to the box 2 and close the solenoid valve 405 close to the liquid inlet pipe B402. The aluminum solution at the bottom of the box 2 is passed through the three-way pipe 404, the liquid outlet pipe 403, the water pump, and the liquid inlet pipe A401 in sequence, and finally injected into the upper part of the box 2, so as to realize the circulation of the aluminum solution and improve the impurity removal effect.

[0038] It should be noted that before adding aluminum solution to the box body 2, the sealing shell 601 of the outer ball 6 needs to be rotated to the upper part. When rotating, the driving shaft 18 can be driven by an external motor to rotate, and the driving shaft 18 drives one of the gears to rotate. Since the two gears are meshed and connected, the two gears can rotate synchronously, so that the other gear drives the rotating drum 17 to rotate, and the rotating drum 17 drives the outer ball 6 to rotate. When the sealing shell 601 of the outer ball 6 rotates to the upper part, it stops rotating. Since the slag inlet pipe 131 is fixed to the base 5 and to the inner ball 10, when the outer ball 6 rotates, the position of the inner ball 10 remains unchanged. Then, the sealing shell 601 The base 5 is sealed so that the aluminum solution does not enter the base 5, but is located above the base 5, that is, in the box body 2; then the gas is sequentially transported to the gas pipe 20, the gas inlet cylinder 19 and the inner ball 10 through the gas generator, and the gas in the inner ball 10 passes through the filter 12 and enters the outer ball 6, and the valve A at the discharge pipe 14 should be sealed. At this time, the inner ball 10 and the outer ball 6 are both in a pressurized state. When the outer ball 6 is rotated again, the bubble hole A8 or the bubble hole B9 at the bubble shell 602 is rotated to the upper part, and the gas in the outer ball 6 passes through the bubble hole A8 or the bubble hole B9 to the aluminum Bubbles are ejected from the solution, with larger bubbles ejected from bubble hole A8 and smaller bubbles ejected from bubble hole B9. It should be noted that the purification system components in the gas generator, for example, use multi-level filters, including primary filters for removing larger particles of dust and impurities, and high-efficiency filters such as HEPA filters for intercepting tiny particles up to 0.3 microns or even smaller particles, to ensure that the gas is as pure as possible before entering the subsequent links, to prevent the impurities carried in the input gas from contaminating the aluminum solution, and the gas generator needs to prevent the aluminum solution from entering the bubble hole A8 by precisely controlling the gas pressure. Or in the bubble hole B9, during normal operation, the gas pressure in the bubble hole A8 or the bubble hole B9 is maintained higher than the sum of the static pressure of the aluminum solution and the additional pressure generated by the surface tension of the aluminum solution. According to the principle of fluid statics, the static pressure of the aluminum solution is related to the solution depth, and the surface tension of the aluminum solution will generate an additional pressure at the edge of the bubble hole A8 or the bubble hole B9 to prevent the solution from entering. By arranging a pressure regulating valve and a pressure sensor at the gas generator of the gas supply, the gas pressure is monitored and adjusted in real time to ensure that it is always higher than the sum of the above pressures, thereby effectively preventing the aluminum solution from entering the bubble hole A8 or the bubble hole B9.

[0039] Then, the outer ball 6 can be repeatedly rotated forward and reversely to realize the alternating ejection of large bubbles and small bubbles. Since the diameter of small bubbles is small, they can provide a larger total surface area in the aluminum solution to contact with impurities. For example, when the bubble diameter is 1 mm and 0.1 mm, the number of small bubbles with a diameter of 0.1 mm is 1000 times that of large bubbles with a diameter of 1 mm for the same volume of gas. This enables the small bubbles to more finely capture tiny impurities in the solution, such as micron-level metal oxide particles and tiny non-metallic inclusions. These tiny impurities can adhere to the surface of the small bubbles. As the bubbles rise, The large bubbles have a larger diameter, a greater buoyancy, and a faster rise speed, and can quickly bring some larger impurities in the solution, such as metal blocks that are not completely melted, and larger agglomerated impurities to the surface of the solution. These large impurities are difficult for small bubbles to carry effectively due to their large mass, but the strong buoyancy of large bubbles can accomplish this task. In addition, during the rising process, large bubbles have a good cleaning effect on the impurities on the surface of the solution. When large bubbles rise rapidly from the bottom of the solution to the surface, they will cause violent fluctuations on the surface of the solution, which can cause the impurities on the surface to gather together. Then, as the bubbles burst, they are brought to the edge of the solution for easy cleaning; when large bubbles and small bubbles are sprayed alternately, the alternating spraying of large bubbles and small bubbles can make full use of their advantages in contact area and contact probability. Due to the large single surface area, large bubbles can quickly contact with impurities in a large range around them at the moment of spraying, adsorb and carry some larger impurity particles or impurity agglomerates upward, while there are a large number of small bubbles. After the large bubbles rise, they can make more detailed contact with the solution and adsorb those tiny impurities missed by the large bubbles, such as micron-level metal particles or fine oxide powders, thereby greatly increasing the total contact area and contact probability with the impurities, and more effectively removing various impurities in the solution. It should be noted that the angle between the inclined surface of the filter plate 3 and the upper surface of the box body 2 does not exceed sixty degrees, so that the shear force on the bubbles rising along the filter plate 3 is relatively small, and the surface of the filter screen 12 should be provided with a smooth surface. The bubbles have a certain stability during the rising process and are not easy to break. The bubbles can rise relatively smoothly, and their shape can remain relatively intact. Moreover, the movement speed of the bubbles will be low, and they can fully contact with the aluminum solution, thereby improving the impurity removal effect and reducing the time used for impurity removal.

[0040] Next, since the axis center lines of each bubble hole A8 and bubble hole B9 point to the center of the outer sphere 6 in the radial direction, wherein the radial direction is based on the center of the outer sphere 6 and extends from the positions of a plurality of bubble holes A8 and a plurality of bubble holes B9 to the center of the sphere, when the bubble holes A8 and the bubble holes B9 spray bubbles into the solution, it can ensure that the aluminum solution can be fully contacted by the bubbles around the entire outer sphere 6, and can achieve more uniform stirring and impurity removal operations on the aluminum solution around it, avoiding the situation where bubbles are too concentrated or not covered by bubbles in a local area, thereby improving the comprehensiveness and uniformity of impurity removal, and can improve the impurity removal efficiency and reduce the time used for impurity removal.

[0041] Then, if Figure 5 As shown, the arrows in the figure are the flow directions of the bubbles. Since the two filter plates 3 are arranged obliquely, a part of the bubbles carrying impurities will float along the inclined surface of the lower filter plate 3, and the other part of the bubbles will contact the upper filter plate 3 and float along the inclined surface of the filter plate 3, and will not pass through the gap between the two filter plates 3. This is because the two filter plates 3 are arranged alternately. When the bubbles float to the upper filter plate 3, the inclined setting of the filter plate 3, on the one hand, enables the filter plate 3 to block the bubbles, and on the other hand, enables the bubbles to float only along the inclined surface of the filter plate 3. Then the bubbles carrying impurities will enter the two collection areas 202, and finally these impurities can be salvaged.

[0042] Finally, the outer ball 6 is rotated and the gas supply is stopped so that the discharge shell 603 of the outer ball 6 is rotated upward. The aluminum solution after impurities are removed enters the outer ball 6 through the discharge port 7 of the discharge shell 603, and the aluminum solution enters the inner ball 10 through the filter screen 12 and is discharged from the discharge hole 11 of the inner ball 10. Then the discharge shell 603 of the outer ball 6 is rotated downward, and the aluminum solution discharged from the discharge hole 11 will enter the discharge pipe 14. The aluminum solution is discharged by opening the valve A of the discharge pipe 14 and collected through an external container. The above operation of the discharge shell 603 is repeated to realize the discharge of the aluminum solution. The filter screen 12 at the inner ball 10 can also prevent the precipitation from escaping from the filter plate 3 and being discharged, and the precipitation escaping from the filter plate 3 will fall to the outer ball 6. Since the outer ball 6 rotates repeatedly during discharge, the scraper 21 in contact with it can scrape off the precipitation settled on the outer ball 6 to prevent the precipitation from clogging the upper part of the outer ball 6 and the bubble holes A8 and B9.

[0043] It should be noted that when the aluminum solution made from metal scraps is made into an object, a sand mold is first made, the molding sand (such as quartz sand) is mixed with a binder (such as bentonite), and placed in a sand box. The mold cavity is pressed out with a pattern (made according to the shape of the required object). For aluminum solution casting, the shrinkage rate of aluminum should be considered, and the pattern size should be appropriately enlarged. For example, for some simple block aluminum products, such as aluminum counterweights, a simple rectangular sand mold is made, and a gate and riser are reserved on the mold. The aluminum solution from metal scraps after impurities removal is slowly poured into the sand mold through the gate at an appropriate temperature (the melting point of aluminum is about 660°C, and the pouring temperature is generally slightly higher than the melting point, such as 700-750°C). During the pouring process, it is necessary to ensure that the aluminum solution flows smoothly to avoid the entrainment of gas to form pores. The aluminum solution cools and solidifies in the mold, and the solidification time depends on the size and shape of the product. For example, smaller aluminum parts may take a few minutes to more than ten minutes to solidify, while large aluminum castings may take several hours. After cooling, the sand mold is broken, the casting is taken out, and it is cleaned and subsequently processed, such as removing the remaining parts of the gate and riser, and polishing the surface.

[0044] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A chip processing device for recycled aluminum casting, comprising a support (1) and a box (2) fixed to the support (1), wherein the box (2) is used to load aluminum solution, characterized in that: The box (2) is provided with a feed inlet (201), a collection area (202) and an impurity removal area (203) which are connected in sequence, two staggered filter plates (3) are installed inside the box (2), a gap is left between the two filter plates (3), and a circulation device (4) for circulating the aluminum solution in the box (2) is installed on the side of the box (2); A base (5) is fixedly installed at the bottom of the box body (2), and an outer ball (6) for rotation is rotatably installed in a slot of the base (5). The outer surface of the outer ball (6) is provided with a discharge port (7), a plurality of bubble holes A (8) and a plurality of bubble holes B (9). The aperture of the bubble hole A (8) is larger than the aperture of the bubble hole B (9). The axis center line of each bubble hole A (8) and bubble hole B (9) points to the center of the outer ball (6) in a radial direction. An inner hole for air intake is installed in the outer ball (6). The inner ball (10) and the outer ball (6) are arranged concentrically, a discharge hole (11) is provided at the bottom end of the inner ball (10), a concave filter screen (12) is fixedly installed in the notch of the inner ball (10), a convex structure at the upper end of the inner ball (10) is matched with the inner wall of the outer ball (6), and the two are in close contact, a cleaning mechanism (13) for cleaning impurities in the filter screen (12) is installed on one side of the base (5), and a discharge pipe (14) for discharging aluminum solution is installed at the bottom of the base (5).

2. The chip processing device for recycled aluminum casting according to claim 1 is characterized in that: Both side surfaces of the two filter plates (3) are in close contact with the inner wall of the box body (2), and the upper ends of the two filter plates (3) are fixedly connected with fixing members (15), which are fixed to the box body (2) by screws.

3. The chip processing device for recycled aluminum casting according to claim 1 is characterized in that: The bottom ends of the two filter plates (3) are bent and have a hook shape.

4. The chip processing device for recycled aluminum casting according to claim 1, characterized in that: The two filter plates (3) are both arranged at an inclination, and the inclined surfaces of the two filter plates (3) are used for installing filter cloths.

5. The chip processing device for recycled aluminum casting according to claim 1, characterized in that: A stirrer (16) for rotation is installed inside the box (2).

6. The chip processing device for recycled aluminum casting according to claim 1, characterized in that: The circulation device (4) comprises a liquid inlet pipe A (401), a liquid inlet pipe B (402), a liquid outlet pipe (403), a three-way pipe (404) and a water pump. The two ends of the liquid inlet pipe A (401) are respectively connected to the box body (2) and the water delivery end of the water pump. The water pump is fixed to the side of the box body (2). The three ends of the three-way pipe (404) are respectively connected to the box body (2), the liquid inlet pipe B (402) and the liquid outlet pipe (403). The other end of the liquid outlet pipe (403) is connected to the water inlet end of the water pump. Solenoid valves (405) are installed at both ends of the three-way pipe (404).

7. The chip processing device for recycled aluminum casting according to claim 1, characterized in that: The cleaning mechanism (13) comprises a pump body, a slag inlet pipe (131) and a slag discharge pipe (132); the pump body is fixed to the base (5); the inlet end and the outlet end of the pump body are respectively connected to the slag inlet pipe (131) and the slag discharge pipe (132); the slag inlet pipe (131) is fixed to the filter screen (12); a through hole is provided at the bottom of the filter screen (12); the through hole is connected to the slag inlet pipe (131); the slag discharge pipe (132) is rotatably connected to the outer ball (6) and is fixedly connected to the inner ball (10) and the base (5); and a valve B is installed at one end of the slag discharge pipe (132).

8. The chip processing device for recycled aluminum casting according to claim 1, characterized in that: A rotating drum (17) is rotatably mounted inside the base (5), and the rotating drum (17) is fixed to the outer ball (6). A driving shaft (18) is rotatably mounted on one side of the base (5). Gears are fixedly connected to the outer surfaces of the rotating drum (17) and the driving shaft (18). The two gears are meshed and connected, and the driving shaft (18) is driven to rotate by an external power source.

9. The chip processing device for secondary aluminum casting according to claim 8, characterized in that: The outer surface of the inner ball (10) is connected to an air inlet cylinder (19), the rotating cylinder (17) is rotatably connected to the air inlet cylinder (19), and a sealing ring is installed between the two. A gas generator is installed on one side of the box body (2), and the gas outlet end of the gas generator is connected to a gas supply pipe (20), and the gas supply pipe (20) is connected to the air inlet cylinder (19).

10. The chip processing device for recycled aluminum casting according to claim 1, characterized in that: An arc-shaped scraper (21) is fixedly inlaid on the upper surface of the base (5), and the scraper (21) is matched with the outer surface of the outer ball (6), and the two are in contact.

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