CN117164364A - Manufacturing method of composite silicon carbide ceramic impeller - Google Patents
Manufacturing method of composite silicon carbide ceramic impeller Download PDFInfo
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- CN117164364A CN117164364A CN202310901146.2A CN202310901146A CN117164364A CN 117164364 A CN117164364 A CN 117164364A CN 202310901146 A CN202310901146 A CN 202310901146A CN 117164364 A CN117164364 A CN 117164364A
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- impeller
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- silicon carbide
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- 239000000919 ceramic Substances 0.000 title claims abstract description 58
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 title claims abstract description 45
- 229910010271 silicon carbide Inorganic materials 0.000 title claims abstract description 45
- 239000002131 composite material Substances 0.000 title claims abstract description 34
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 26
- 239000002195 soluble material Substances 0.000 claims abstract description 29
- 239000002184 metal Substances 0.000 claims abstract description 28
- 238000005266 casting Methods 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910010293 ceramic material Inorganic materials 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 4
- 239000011248 coating agent Substances 0.000 claims abstract description 4
- 238000000576 coating method Methods 0.000 claims abstract description 4
- 239000007888 film coating Substances 0.000 claims abstract description 4
- 238000009501 film coating Methods 0.000 claims abstract description 4
- 239000002352 surface water Substances 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 14
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 11
- 239000004202 carbamide Substances 0.000 claims description 11
- CZMRCDWAGMRECN-UGDNZRGBSA-N Sucrose Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 CZMRCDWAGMRECN-UGDNZRGBSA-N 0.000 claims description 9
- 229930006000 Sucrose Natural products 0.000 claims description 9
- 239000002202 Polyethylene glycol Substances 0.000 claims description 8
- 229920001223 polyethylene glycol Polymers 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 7
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 3
- -1 uniformly stirring Substances 0.000 claims description 2
- 238000001816 cooling Methods 0.000 abstract description 7
- 239000011162 core material Substances 0.000 description 63
- 239000000463 material Substances 0.000 description 7
- 239000002002 slurry Substances 0.000 description 6
- 238000005187 foaming Methods 0.000 description 4
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 229910052602 gypsum Inorganic materials 0.000 description 2
- 239000010440 gypsum Substances 0.000 description 2
- 239000011259 mixed solution Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000000805 composite resin Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/56—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides
- C04B35/565—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides based on silicon carbide
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
- C04B35/632—Organic additives
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
- C04B35/632—Organic additives
- C04B35/634—Polymers
- C04B35/63448—Polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B35/63488—Polyethers, e.g. alkylphenol polyglycolether, polyethylene glycol [PEG], polyethylene oxide [PEO]
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/71—Ceramic products containing macroscopic reinforcing agents
- C04B35/74—Ceramic products containing macroscopic reinforcing agents containing shaped metallic materials
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Ceramic Products (AREA)
Abstract
The invention relates to a manufacturing method of a composite silicon carbide ceramic impeller, which comprises the following steps: splitting the impeller runner cores into a corresponding number of combined impeller cores according to the number of blades in the impeller; manufacturing a core box mould of the impeller core; preparing a water-soluble material for making a core; coating a film coating agent on the surface of a mold, preheating the mold, heating and stirring a water-soluble material uniformly, injecting the water-soluble material into a core box mold cavity of an impeller core, and cooling to obtain the impeller core; combining the impeller cores, putting the impeller cores into an impeller ceramic casting mold provided with an impeller metal framework, injecting the mixed silicon carbide ceramic material, solidifying, and disassembling the impeller ceramic casting mold to obtain a composite silicon carbide ceramic impeller blank; the impeller blank is put into water, a water-soluble impeller core is dissolved, and the surface water is dried to form the composite silicon carbide ceramic impeller. The invention solves the problem that the composite silicon carbide ceramic impeller has difficult runner mold taking in the casting process.
Description
Technical Field
The invention relates to a method for manufacturing a composite silicon carbide ceramic impeller, which is used for manufacturing a silicon carbide-resin composite ceramic impeller product and belongs to the technical field of impeller manufacturing.
Background
Silicon carbide is an excellent acid and alkali corrosion resistant and abrasion resistant material, and can be compounded with resin to manufacture a lining of a slurry pump flow-through piece, so that the service life of the slurry pump flow-through piece is greatly prolonged and is 2-3 times that of a traditional abrasion resistant metal slurry pump flow-through piece. In order to improve the service life of the slurry pump impeller, impellers adopting composite silicon carbide ceramic materials are also gradually applied to the market.
The impeller is formed into a closed flow channel by the front cover plate and the rear cover plate, and a plurality of twisted blades are arranged in the flow channel, so that the structure of the impeller is more repeatedly added with parts such as a pump body, a pump cover and the like. The twisted closed flow channel causes the impeller to be difficult to be demolded in the ceramic casting molding process. In order to achieve smooth demolding of the impeller runner, some manufacturers use "gypsum cores", "foam cores" or "metal molds" to make the runner structure of the impeller. The former two processes need to manufacture corresponding core boxes, but the surface of the gypsum core is rough, the material is harder, and sharp corners are easily damaged during assembly to cause the surface roughness of the impeller; the foaming requirement of the foam core is high, special foaming equipment is needed, the reaction time of the foaming material is short (about 10 seconds), and the reaction operation time is insufficient for the impeller with a large and complex structure, so that the foaming material is difficult to realize. The metal mold is characterized in that a metal framework of the impeller is coated by a metal mold to form a cavity, ceramic is injected into the cavity, the metal mold of the blades needs to be disassembled into a plurality of blocks in order to ensure the mold taking, and the clearance space between the two blades is utilized for assembly.
Disclosure of Invention
The invention provides a manufacturing method of a composite silicon carbide ceramic impeller core, which aims to solve the problem that a runner is difficult to take a mold in the casting process of a composite silicon carbide ceramic impeller, and comprises the following specific steps:
1. splitting the impeller runner core into a corresponding number of combined impeller cores according to the number of blades in the impeller (if 4 blades are provided, 4 cores are required to be manufactured);
2. manufacturing a core box mould of the impeller core;
3. preparing a material for manufacturing a core, wherein the core material selected by the invention is a water-soluble material;
4. firstly, heating and melting a water-soluble material, uniformly stirring, coating a film coating agent on the surface of a die, preheating the die, injecting the melted water-soluble material into a die cavity of a core box die of an impeller core, and forming the required water-soluble impeller core after the water-soluble material is cooled;
5. combining the water-soluble impeller cores, putting the combined water-soluble impeller cores into an impeller ceramic casting mold which is provided with an impeller metal framework 1 in advance, injecting a mixed silicon carbide ceramic material, disassembling the impeller ceramic casting mold after the silicon carbide ceramic material is solidified, and taking out a composite silicon carbide ceramic impeller blank with the impeller metal framework, the impeller ceramic layer and the water-soluble impeller cores;
6. and (3) putting the composite silicon carbide ceramic impeller blank into water, dissolving out the water-soluble impeller core, and drying the surface water to form the composite silicon carbide ceramic impeller.
Further, the water-soluble material used in the invention can be urea mixture, wherein the proportion of urea is 95% and the proportion of white sugar is 5%, the materials are uniformly mixed, heated to about 120-140 ℃, and the urea and white sugar are melted and uniformly stirred and then injected into a mold cavity of the impeller mold core, and after the materials are cooled, the urea type water-soluble mold core of the impeller is formed.
The water-soluble material used in the invention can also be water-soluble polyethylene glycol wax, wherein the water-soluble polyethylene glycol wax is added into tap water, and the weight ratio of water to wax is 1: and 0.6, heating to about 90 ℃ to melt, adding 4-10% of citric acid to increase the melting speed, injecting melted water-soluble polyethylene glycol wax liquid into a mold cavity of the impeller core by using a wax injection machine, stabilizing the pressure for 1-2 minutes, cooling to room temperature, and opening the mold to form the polyethylene glycol wax water-soluble core of the impeller.
Because the impeller core is thicker (the thickest part reaches 80 mm), the water-soluble material is cooled too slowly, and 1-2 hours are required for manufacturing the impeller core, so that the operation efficiency is affected. In order to accelerate the cooling rate of the water-soluble material and reduce the consumption of the water-soluble material without reducing the strength, the inventor designs a water-soluble impeller core lined with a metal framework. Because the inner lining is provided with the metal framework, the water-soluble material layer of the impeller core can be thinned to the thickness of 3-5mm, so that the consumption of the water-soluble material is reduced. Meanwhile, the metal has high heat conductivity, so that the cooling rate of the water-soluble core can be increased, the time for manufacturing the water-soluble impeller core can be shortened to 10 minutes, and the manufacturing efficiency is greatly improved.
More specifically, the metal-water-soluble material composite water-soluble impeller core of the composite silicon carbide ceramic impeller is manufactured by adopting the method, the composite water-soluble impeller core is placed into a cavity of an impeller ceramic casting mold, after being matched with an impeller metal framework, the water-soluble impeller core is fixed, the impeller ceramic casting mold is assembled, and the pre-mixed silicon carbide ceramic slurry is injected, vibrated, heated and solidified. And after the silicon carbide ceramic material is completely solidified, taking the ceramic impeller with the water-soluble impeller core out of the die, putting the ceramic impeller into water at normal temperature, dissolving out the water-soluble material layer of the impeller core, and extracting the lining metal framework to form a runner structure of the composite silicon carbide ceramic impeller. Finally, the surface moisture is dried to form a complete silicon carbide ceramic impeller.
Advantageous effects
The water-soluble material is used as the core of the impeller for casting, so that the geometric shape and the size of the part can be guaranteed, the production cost is reduced, the work efficiency is improved, and the economic benefit is very remarkable.
Because the water-soluble core lining has metal skeleton, the cooperation contact surface is the metal material when the cooperation of a plurality of water-soluble cores, has avoided the core of full water-soluble material when the cooperation, causes the condition that the cooperation surface is defective, bumps bad because of the operation, has improved dimensional accuracy.
The strength of the core is improved by the inner metal framework, and the deformation of the core caused by uneven heating in the cooling process is avoided.
The water-soluble mold core is lined with the metal framework structure, so that the consumption of water-soluble materials is reduced, the cooling and solidifying time of the water-soluble materials is saved, and the impeller manufacturing efficiency is improved.
Drawings
Fig. 1: the water-soluble material layer 32 in the impeller core is combined with the lining metal skeleton 31,
fig. 2: a schematic diagram of the assembly of the water-soluble impeller core 3 and the impeller metal skeleton 1 in the ceramic casting mold 4,
fig. 3: the metal framework 1 of the impeller is schematically shown,
fig. 4: a schematic drawing of a composite silicon carbide ceramic impeller blank with a water-soluble impeller core 3,
fig. 5: the composite silicon carbide ceramic impeller structure diagram after the water-soluble impeller core 3 is dissolved.
In the figure: 1. impeller metal skeleton; 2. impeller ceramic layer 3, water-soluble impeller core 31, impeller core lining metal skeleton 32, impeller core water-soluble material layer 4 and impeller ceramic casting mould
Detailed Description
The invention will now be described in detail by way of specific embodiments, which are to be construed as merely illustrative and not limitative of the remainder of the disclosure. The scope of the invention is defined by the claims.
See the drawings in the specification.
1. Splitting the impeller runner core into 4 combined impeller cores;
2. manufacturing a core box mould of the impeller core;
3. preparing urea and white sugar mixed solution, wherein the proportion of urea is 95%, the proportion of white sugar is 5%, uniformly mixing, and heating to about 120-140 ℃ for melting;
4. coating a film coating agent on the surface of a mold, preheating the mold, injecting the melted urea white sugar mixed solution into a core box mold cavity of an impeller core, and cooling to form a water-soluble impeller core 3;
5. 4 water-soluble impeller cores 3 are combined, placed into an impeller ceramic casting mold 4 which is provided with an impeller metal framework 1 in advance, mixed silicon carbide ceramic materials are injected, after the silicon carbide ceramic materials are solidified, the impeller ceramic casting mold 4 is disassembled, and a composite silicon carbide ceramic impeller blank with the impeller metal framework 1, the impeller ceramic layer 2 and the water-soluble impeller cores 3 is taken out.
6. And putting the composite silicon carbide ceramic impeller blank into water, dissolving out the water-soluble impeller core 3, and drying surface water to form the composite silicon carbide ceramic impeller.
Wherein steps 5 and 6 are described in detail as follows: the composite water-soluble impeller core 3 is placed into a cavity of an impeller ceramic casting mold 4, after being matched with the impeller metal framework 1, the water-soluble impeller core 3 is fixed, the impeller ceramic casting mold 4 is assembled, and the pre-mixed silicon carbide ceramic slurry is injected, vibrated, heated and solidified. After the silicon carbide ceramic material is completely solidified, the ceramic impeller with the water-soluble impeller core 3 is taken out of the die, put into water at normal temperature, the impeller core water-soluble material layer 32 is dissolved, the lining metal framework 31 is pulled out, and the runner structure of the composite silicon carbide ceramic impeller is formed. Finally, the surface moisture is dried to form a complete silicon carbide ceramic impeller.
The present invention has been described in detail with reference to the embodiments. It should be noted that various changes and modifications can be made to these embodiments by those skilled in the art without departing from the principles and spirit of the invention, but these changes and modifications fall within the scope of the invention.
Claims (7)
1. A manufacturing method of a composite silicon carbide ceramic impeller is characterized in that: the method comprises the following steps: splitting the impeller runner core into a corresponding number of combined impeller cores according to the number of blades in the impeller; manufacturing a core box mould of the impeller core; preparing a water-soluble material for making a core; heating and melting the water-soluble material, uniformly stirring, coating a film coating agent on the surface of a die, preheating the die, injecting the melted water-soluble material into a core box die cavity of the impeller core, and forming the required water-soluble impeller core after the water-soluble material is cooled; combining water-soluble impeller cores (3), putting the combined water-soluble impeller cores into an impeller ceramic casting mold (4) provided with an impeller metal framework (1) in advance, injecting a mixed silicon carbide ceramic material, disassembling the impeller ceramic casting mold (4) after the silicon carbide ceramic material is solidified, and taking out a composite silicon carbide ceramic impeller blank with the impeller metal framework (1), an impeller ceramic layer (2) and the water-soluble impeller cores (3); and (3) putting the composite silicon carbide ceramic impeller blank into water, dissolving out the water-soluble impeller core (3), and drying the surface water to form the composite silicon carbide ceramic impeller.
2. The method for manufacturing the composite silicon carbide ceramic blade according to claim 1, wherein: the water-soluble material is urea white sugar mixture.
3. The method for manufacturing the composite silicon carbide ceramic impeller according to claim 2, wherein: in the urea white sugar mixture, the proportion of urea is 95%, and the rest is white sugar.
4. A method of manufacturing a composite silicon carbide ceramic impeller according to claim 3, wherein: the heating temperature of the urea white sugar mixture is 120-140 ℃.
5. The method for manufacturing the composite silicon carbide ceramic impeller according to claim 1, wherein the method comprises the following steps: the water-soluble material is a mixture of polyethylene glycol wax and water.
6. The method for manufacturing the composite silicon carbide ceramic impeller according to claim 5, wherein the method comprises the following steps: in the mixture of polyethylene glycol wax and water, the weight ratio of water to polyethylene glycol wax is 1:0.6.
7. the method for manufacturing the composite silicon carbide ceramic impeller according to claim 6, wherein the method comprises the following steps: the heating temperature of the mixture of polyethylene glycol wax and water is 90 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310901146.2A CN117164364A (en) | 2023-07-21 | 2023-07-21 | Manufacturing method of composite silicon carbide ceramic impeller |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310901146.2A CN117164364A (en) | 2023-07-21 | 2023-07-21 | Manufacturing method of composite silicon carbide ceramic impeller |
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| Publication Number | Publication Date |
|---|---|
| CN117164364A true CN117164364A (en) | 2023-12-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310901146.2A Pending CN117164364A (en) | 2023-07-21 | 2023-07-21 | Manufacturing method of composite silicon carbide ceramic impeller |
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| Country | Link |
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| CN (1) | CN117164364A (en) |
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- 2023-07-21 CN CN202310901146.2A patent/CN117164364A/en active Pending
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