CN114918368A - Multi-material mixed frozen sand mold classified recovery method and device - Google Patents
Multi-material mixed frozen sand mold classified recovery method and device Download PDFInfo
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- CN114918368A CN114918368A CN202210567014.6A CN202210567014A CN114918368A CN 114918368 A CN114918368 A CN 114918368A CN 202210567014 A CN202210567014 A CN 202210567014A CN 114918368 A CN114918368 A CN 114918368A
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- 239000004576 sand Substances 0.000 title claims abstract description 191
- 239000000463 material Substances 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000011084 recovery Methods 0.000 title claims description 18
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 228
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 19
- 229910052845 zircon Inorganic materials 0.000 claims abstract description 19
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000004064 recycling Methods 0.000 claims abstract description 12
- 238000001179 sorption measurement Methods 0.000 claims description 69
- 239000006185 dispersion Substances 0.000 claims description 28
- 230000005540 biological transmission Effects 0.000 claims description 26
- 230000000149 penetrating effect Effects 0.000 claims description 15
- 239000003795 chemical substances by application Substances 0.000 claims description 11
- 239000002699 waste material Substances 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 2
- 238000012216 screening Methods 0.000 claims description 2
- 239000000919 ceramic Substances 0.000 claims 2
- 238000005266 casting Methods 0.000 abstract description 14
- 238000004519 manufacturing process Methods 0.000 abstract description 14
- -1 zircon sand Chemical compound 0.000 abstract description 3
- 230000008014 freezing Effects 0.000 description 5
- 238000007710 freezing Methods 0.000 description 5
- 239000012528 membrane Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000003110 molding sand Substances 0.000 description 3
- 238000007528 sand casting Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000007849 furan resin Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000012778 molding material Substances 0.000 description 1
- 229910021652 non-ferrous alloy Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
- B22C5/06—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by sieving or magnetic separating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention relates to the field of manufacturing of multi-material mixed frozen sand molds, in particular to a method and a device for classifying and recycling the multi-material mixed frozen sand molds. The method can realize the classified recycling of the four kinds of sand, namely zircon sand, chromite sand, silica sand and ceramsite sand, reduces the loss of framework materials in the manufacturing process of the multi-material frozen sand mold, and accords with the concepts of green casting and high-performance manufacturing.
Description
Technical Field
The invention relates to the field of multi-material mixed frozen sand mold manufacturing, in particular to a method and a device for classifying and recycling multi-material mixed frozen sand molds.
Background
Sand casting refers to a process for producing castings in sand, and castings of steel, iron and most nonferrous alloys can be obtained by sand casting. The molding material used by sand casting is cheap and easy to obtain, the casting mould is simple and convenient to manufacture, and the casting mould can adapt to single-piece production, batch production and mass production of castings, and is a basic process in casting production for a long time.
The freezing sand mold casting is to replace a furan resin adhesive in the traditional sand mold casting with a water-based adhesive, the manufactured sand mold is frozen and then is subjected to pouring treatment, the freezing sand mold melts and shakeouts along with the rise of the temperature of the sand mold after the pouring is finished, and the sand mold to be treated is green and environment-friendly.
The multi-material mixed frozen sand mold material adding and reducing manufacturing is self-adaptive manufacturing by adopting different types of molding sand, different types of molding sand for complex castings can be used for different parts of the castings to obviously improve the mechanical property of the castings, and meanwhile, the multi-material mixed frozen sand mold can be recycled after pouring and collapsing, but different types of molding sand are difficult to screen and separate in the waste sand treatment process, so that huge waste is caused.
Disclosure of Invention
In order to solve the problems, the invention provides a method and a device for classifying and recycling multi-material mixed frozen sand molds, which can realize the classification and recycling of four kinds of sand, namely zircon sand, chromite sand, silica sand and ceramsite sand, reduce the loss of framework materials in the manufacturing process of the multi-material mixed frozen sand molds, and accord with the concepts of green casting and high-performance manufacturing.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides a categorised recovery unit of multi-material mixed freezing sand mould, the power distribution box comprises a box body, lay the feed inlet directly over the box, lay the vibration structure in the box, electromagnetic adsorption structure and centrifugal dispersion structure, and lay four discharge gates in the box below, the sand grain is put into from the feed inlet, remove the ceramsite sand through the vibration structure sieve, remove the chromite sand through the electromagnetic adsorption structure sieve, sieve silica sand and zircon sand through centrifugal dispersion structure, the ceramsite sand, the chromite sand, the classification and the recovery of silica sand and zircon sand go on simultaneously, load the dress sand groove and be used for collecting the sand after categorised under the discharge gate.
As a further design of the scheme, the vibrating structure comprises a sieve plate which is obliquely arranged, a sliding block used for driving the sieve plate to horizontally slide, a transmission rod, a transmission wheel and a motor, wherein the transmission wheel, the transmission rod, the sliding block and the sieve plate are sequentially connected, the motor is arranged on the outer side of the box body, and the transmission rod is controlled to rotate by driving the transmission wheel so as to control the sieve plate to horizontally slide.
Further design as this scheme, the electromagnetism adsorption structure including the electromagnetism adsorption plate that the slope set up, a bracing piece for supporting the electromagnetism adsorption plate, set up the conveyer belt in the electromagnetism adsorption plate below through the support frame, the circular telegram of electromagnetism adsorption plate produces magnetic force, chromite sand in the sand grain adsorbs on the electromagnetism adsorption plate, and remaining sand sees through the gap in the middle of the electromagnetism adsorption plate and falls into the conveyer belt, drive remaining sand through the conveyer belt and get into centrifugal dispersion structure, the outage of electromagnetism adsorption structure, the chromite sand that is adsorbed in the electromagnetism adsorption plate falls into the discharge gate.
As a further design of the scheme, the centrifugal dispersion structure comprises a pipeline, a penetrating film, a transmission wheel, a discharge port and a roller, wherein the transmission wheel controls the roller to rotate, the pipeline is introduced into the roller, sand grains are immersed by an extracting agent, the roller rotates to drive the sand grains to rotate, different sand grains are layered due to different stacking densities, the penetrating film with light density is positioned at the upper part, the penetrating film with heavy density is positioned at the lower part, and the roller stops rotating the sand grains to be discharged from the discharge port.
As a further design of the scheme, the sieve plate is used for screening the ceramsite sand, and the aperture of the sieve plate is set to be 5-7 mm.
As a further design of the scheme, a square hole is cut in the middle of the electromagnetic adsorption plate and used for shakeout, the conveyor belt below the electromagnetic adsorption plate is used for conveying sand, the conveyor belt can rotate forwards or backwards, and the electromagnetic adsorption plate needs to be powered off to enable chromite sand to fall off in the process of rotating backwards of the conveyor belt.
As a further design of the scheme, the pipeline is connected with the center of the roller, the roller is divided into an inner layer and an outer layer, the extracting agent in the inner layer flows to the outer layer in the rotating process of the roller and is mixed with sand grains, and then the silica sand and the zircon sand penetrate through the penetrating film to generate layering.
The invention also provides a multi-material mixed frozen sand mold classification recycling method, which is realized based on the classification recycling device and comprises the following steps:
step 1: starting a classification recovery device, feeding the multi-material mixed frozen waste sand into a feed inlet, electrifying a vibration structure, vibrating a sieve plate leftwards and rightwards, vibrating ceramsite sand with larger particles in the waste sand to fall into a discharge outlet, and allowing the rest sand grains to enter an electromagnetic adsorption structure;
step 2: chromite sand in the sand grains entering the electromagnetic adsorption structure is adsorbed on the electromagnetic adsorption plate, and the rest sand grains fall into the conveying belt along the electromagnetic adsorption plate, and are conveyed into the centrifugal dispersion structure through the conveying belt;
and step 3: the electromagnetic adsorption plate is powered off, the chromite sand adsorbed on the electromagnetic adsorption plate falls onto the conveyor belt, the conveyor belt rotates reversely, and the chromite sand is conveyed to the discharge port;
and 4, step 4: introducing an extracting agent into a pipeline of the centrifugal dispersion structure, feeding sand grains in the centrifugal dispersion structure into a roller, driving the roller to rotate by a driving wheel controlled by a motor, and rotating liquid sand mixing particles in the roller to realize layering; the silica sand with lighter stacking density is positioned at the upper part of the roller, the zircon sand with heavier stacking density is positioned at the lower part of the roller, and the sand grains are transmitted through the penetrating film;
and 5: and discharging the silica sand and the zircon sand through a discharge hole after layering is finished.
The invention has the following beneficial effects:
the method can realize the classified recycling of the four kinds of sand, namely zircon sand, chromite sand, silica sand and ceramsite sand, reduces the loss of framework materials in the manufacturing process of the multi-material frozen sand mold, and accords with the concepts of green casting and high-performance manufacturing.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a schematic structural diagram of a multi-material mixed frozen sand mold sorting and recycling device according to an embodiment of the invention.
Fig. 2 is a schematic structural diagram of a vibrating structure in an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of an electromagnetic adsorption structure in an embodiment of the present invention.
Fig. 4 is a schematic structural view of a centrifugal dispersing structure in an embodiment of the present invention.
In the figure: 1-a feed inlet; 2-a box body; 3-discharging port; 4-sieve plate; 5-a slide block; 6-a transmission rod; 7-a transmission wheel; 8-an electromagnetic adsorption plate; 9-a support bar; 10-a conveyor belt; 11-a support frame; 12-a pipeline; 13-a penetrating membrane; 14-a transmission wheel; 15-a discharge hole; 16-roller.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the concept of the invention. All falling within the scope of the present invention.
Example 1
A multi-material mixed frozen sand mold classification recovery device comprises a box body 2, a feed inlet 1, a vibration structure, an electromagnetic adsorption structure, a centrifugal dispersion structure and four discharge ports 3, wherein the feed inlet 1 is arranged right above the box body 2, the vibration structure, the electromagnetic adsorption structure and the centrifugal dispersion structure are arranged in the box body 2, the four discharge ports 3 are arranged below the box body 2, the vibration structure, the electromagnetic adsorption structure and the centrifugal dispersion structure are sequentially installed from left to right, the bottom of the vibration structure is connected with the discharge ports 3, and the right side of the vibration structure is connected with the electromagnetic adsorption structure; the bottom of the electromagnetic adsorption structure is connected with the discharge port 3, and the right side of the electromagnetic adsorption structure is connected with the centrifugal dispersion structure; the bottom of the centrifugal dispersion structure is connected with a discharge port 3.
Sand grains are put from the feed port 1, ceramsite sand is sieved out through the vibration structure, chromite sand is sieved out through the electromagnetic adsorption structure, silica sand and zircon sand are sieved out through the centrifugal dispersion structure, and a sand loading groove is arranged right below the discharge port and used for collecting the classified sand
The vibrating structure comprises a sieve plate 4, a sliding block 5, a transmission rod 6, a transmission wheel 7 and a motor, wherein the sieve plate 4 is arranged in an inclined manner by 45 degrees, the sliding block 5 is used for driving the sieve plate 4 to horizontally slide, the transmission wheel 7, the transmission rod 6, the sliding block 5 and the sieve plate 4 are sequentially connected, the motor is arranged on the outer side of the box body 2, and the transmission rod 6 is controlled to rotate by driving the transmission wheel 7 so as to control the left-right vibration of the sieve plate 4.
The electromagnetism adsorption structure including the electromagnetism adsorption plate 8 that the slope set up, be used for supporting the bracing piece of electromagnetism adsorption plate 8, set up conveyer belt 10 in the electromagnetism adsorption plate 8 below through support frame 11, the electromagnetism adsorption plate circular telegram produces magnetic force, chromite sand in the sand grain adsorbs on electromagnetism adsorption plate 8, and remaining sand sees through the gap in the middle of the electromagnetism adsorption plate and falls into conveyer belt 10, drives remaining sand through conveyer belt 10 and gets into centrifugal dispersion structure. The power of the electromagnetic adsorption structure is cut off, and the chromite sand adsorbed on the electromagnetic adsorption plate 8 falls into the discharge hole 3.
The centrifugal dispersion structure comprises a pipeline 12, a penetrating membrane 13, a driving wheel 14, a discharge port 15 and a roller 16, wherein the driving wheel 14 controls the roller 16 to rotate, the pipeline 12 is led into the roller 16, sand grains are immersed by an extracting agent, the roller 16 rotates to drive the sand grains to rotate, different sand grains are layered due to different stacking densities, the sand grains with light densities pass through the penetrating membrane 13 and are positioned at the upper part, the sand grains with heavy densities pass through the penetrating membrane 13 and are positioned at the lower part, and the 16-roller stops rotating the sand grains to be discharged from the discharge port 15.
When the multi-material freezing sand tray is used, the manufactured multi-material freezing sand grains are conveyed into the classification and recovery device through the feeding port, the sand grains firstly enter the vibration device, the motor is connected with the driving wheel, and the driving wheel drives the transmission rod to further drive the sieve plate to rotate around the shaft. The sand grains firstly fall onto the sieve plate, the sieve plate vibrates to drive the small-grain sand grains to fall off from the sieve plate, and the large-grain ceramsite sand grains are left on the sieve plate and fall into a first discharge port along with the rotation of the sieve plate. The rest sand grains enter the electromagnetic adsorption device from the right side of the vibration device, the chromite sand in the sand grains is adsorbed on the electromagnetic adsorption plate after the electromagnetic adsorption device is electrified, and the rest sand grains fall onto the conveying belt along the electromagnetic adsorption plate and enter the centrifugal dispersion structure along the conveying belt. Then the power supply of the electromagnetic coil is cut off, and the chromite sand adsorbed on the electromagnetic adsorption plate falls into a second discharge hole. After sand grains enter the roller of the centrifugal dispersion structure, the pipeline is opened, the extracting agent flows into the roller of the centrifugal dispersion structure along the pipeline, the roller starts to rotate after the sand grains are immersed by the extracting agent, the lower part is positioned at the lower part with low bulk density under the action of centrifugal force, and the lower part is positioned at the higher part with high bulk density. The low bulk density of silica sand is located the gyro wheel upper portion, and the high bulk density of zircon sand is located the gyro wheel lower part. In the post-treatment, the two kinds of sand screened out can be respectively put into a heating device, and an inductance coil in the heating device is electrified to heat silica sand and zircon sand to remove the extracting agent in the sand grains. And after the removal, the silica sand and the zircon sand respectively flow out of the third discharge hole and the fourth discharge hole.
Example 2
A multi-material mixed frozen sand mold classification recycling method is realized based on the classification recycling device in embodiment 1, and comprises the following steps:
step 1: starting a classification recovery device, feeding the multi-material mixed frozen waste sand into a feed inlet, electrifying a vibration structure, vibrating a sieve plate leftwards and rightwards, vibrating ceramsite sand with larger particles in the waste sand to fall into a discharge outlet, and allowing the rest sand grains to enter an electromagnetic adsorption structure;
and 2, step: chromite sand in the sand grains entering the electromagnetic adsorption structure is adsorbed on the electromagnetic adsorption plate, and the rest sand grains fall into a conveyor belt along the electromagnetic adsorption plate and are conveyed into a centrifugal dispersion structure through the conveyor belt;
and 3, step 3: the electromagnetic adsorption plate is powered off, the chromite sand adsorbed on the electromagnetic adsorption plate falls onto the conveyor belt, and the conveyor belt rotates reversely to convey the chromite sand into the discharge port;
and 4, step 4: introducing an extracting agent into a pipeline of the centrifugal dispersion structure, feeding sand grains in the centrifugal dispersion structure into a roller, controlling a driving wheel by a motor to drive the roller to rotate, and rotating liquid sand-mixed particles in the roller to realize layering; the silica sand with lighter stacking density is positioned at the upper part of the roller, the zircon sand with heavier stacking density is positioned at the lower part of the roller, and the sand grains are transmitted through the penetrating film;
and 5: and discharging the silica sand and the zircon sand through a discharge hole after layering is finished.
The specific implementation can classify and recycle four kinds of specific sand, if the number of the specific sand is less than four, the specific sand can still be classified and recycled, but the sand types need to be within the four kinds.
The foregoing description has described specific embodiments of the present invention. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (8)
1. The utility model provides a categorised recovery unit of frozen sand mould is mixed to many materials which characterized in that: the power distribution box comprises a box body, lay the feed inlet directly over the box, lay the vibrating structure in the box, electromagnetic adsorption structure and centrifugal dispersion structure, and lay four discharge gates in the box below, the sand grain is put into from the feed inlet, ceramic grain sand is removed through the vibrating structure sieve, chromite sand is removed through the electromagnetic adsorption structure sieve, through centrifugal dispersion structure sieve silica sand and zircon sand, ceramic grain sand, chromite sand, silica sand and zircon sand's classification and recovery go on simultaneously, load the sand charging groove under the discharge gate and be used for collecting the sand after categorised.
2. The multi-material mixed frozen sand mold classification and recovery device according to claim 1, wherein: the vibrating structure comprises a sieve plate, a sliding block, a transmission rod, a transmission wheel and a motor, wherein the sieve plate is obliquely arranged, the sliding block is used for driving the sieve plate to horizontally slide, the transmission wheel, the transmission rod, the sliding block and the sieve plate are sequentially connected, the motor is arranged on the outer side of the box body, and the transmission rod is controlled to rotate by driving the transmission wheel so as to control the sieve plate to horizontally slide.
3. The multi-material mixed frozen sand mold classification and recovery device according to claim 1, wherein: the electromagnetism adsorption structure including the electromagnetism adsorption plate that the slope set up, be used for supporting the bracing piece of electromagnetism adsorption plate, set up the conveyer belt in the electromagnetism adsorption plate below through the support frame, the electromagnetism adsorption plate circular telegram produces magnetic force, chromite sand in the sand grain adsorbs on the electromagnetism adsorption plate, and remaining sand sees through the gap in the middle of the electromagnetism adsorption plate and falls into the conveyer belt, drives remaining sand through the conveyer belt and gets into centrifugal dispersion structure, the electromagnetism adsorption structure outage is adsorbed in the chromite sand of electromagnetism adsorption plate and falls into the discharge gate.
4. The multi-material mixed frozen sand mold sorting and recycling device according to claim 1, wherein: the centrifugal dispersion structure comprises a pipeline, a penetrating film, a transmission wheel, a discharge port and a roller, wherein the transmission wheel controls the roller to rotate, the pipeline is introduced into the roller, sand grains are immersed by an extracting agent, the roller rotates to drive the sand grains to rotate, different sand grains have different stacking densities so as to generate layering, the penetrating film with light density is positioned at the upper part, the penetrating film with heavy density is positioned at the lower part, and the roller stops rotating the sand grains to be discharged from the discharge port.
5. The multi-material mixed frozen sand mold classification and recovery device according to claim 2, wherein: the sieve plate is used for screening ceramsite sand, and the aperture of the sieve plate is set to be 5mm-7 mm.
6. The multi-material mixed frozen sand mold classification and recovery device according to claim 3, wherein: a square hole is cut in the middle of the electromagnetic adsorption plate and used for falling sand, the conveyor belt below the electromagnetic adsorption plate is used for conveying sand, the conveyor belt can rotate positively and reversely, and the electromagnetic adsorption plate needs to be powered off in the process of rotating reversely to allow chromite sand to fall.
7. The multi-material mixed frozen sand mold classification and recovery device according to claim 4, wherein: the pipeline is connected with the center of the roller, the roller is divided into an inner layer and an outer layer, the extracting agent in the inner layer flows to the outer layer in the rotating process of the roller and is mixed with sand, and silica sand and zircon sand penetrate through the penetrating film to generate layering.
8. The classified recovery method of the multi-material mixed frozen sand mold is characterized by comprising the following steps of: the classified recovery device according to any one of claims 1-7, comprising the steps of:
step 1: starting a classification recovery device, feeding the multi-material mixed frozen waste sand into a feed inlet, electrifying a vibration structure, vibrating a sieve plate leftwards and rightwards, vibrating ceramsite sand with larger particles in the waste sand to fall into a discharge outlet, and allowing the rest sand grains to enter an electromagnetic adsorption structure;
step 2: chromite sand in the sand grains entering the electromagnetic adsorption structure is adsorbed on the electromagnetic adsorption plate, and the rest sand grains fall into the conveying belt along the electromagnetic adsorption plate, and are conveyed into the centrifugal dispersion structure through the conveying belt;
and step 3: the electromagnetic adsorption plate is powered off, the chromite sand adsorbed on the electromagnetic adsorption plate falls onto the conveyor belt, the conveyor belt rotates reversely, and the chromite sand is conveyed to the discharge port;
and 4, step 4: introducing an extracting agent into a pipeline of the centrifugal dispersion structure, feeding sand grains in the centrifugal dispersion structure into a roller, driving the roller to rotate by a driving wheel controlled by a motor, and rotating liquid sand mixing particles in the roller to realize layering; the silica sand with lighter stacking density is positioned at the upper part of the roller, the zircon sand with heavier stacking density is positioned at the lower part of the roller, and the sand grains are transmitted through the penetrating film;
and 5: and discharging the silica sand and the zircon sand through a discharge hole after layering is finished.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210567014.6A CN114918368A (en) | 2022-05-24 | 2022-05-24 | Multi-material mixed frozen sand mold classified recovery method and device |
| CN202310578247.0A CN116871455A (en) | 2022-05-24 | 2023-05-22 | Continuous grading separation method and device for multi-material mixed frozen sand mold |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210567014.6A CN114918368A (en) | 2022-05-24 | 2022-05-24 | Multi-material mixed frozen sand mold classified recovery method and device |
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| CN202310578247.0A Pending CN116871455A (en) | 2022-05-24 | 2023-05-22 | Continuous grading separation method and device for multi-material mixed frozen sand mold |
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| CN116871455A (en) | 2023-10-13 |
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