CN108188344B - Integrated sand supply system that 3D printer was used - Google Patents
Integrated sand supply system that 3D printer was used Download PDFInfo
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- CN108188344B CN108188344B CN201810076974.6A CN201810076974A CN108188344B CN 108188344 B CN108188344 B CN 108188344B CN 201810076974 A CN201810076974 A CN 201810076974A CN 108188344 B CN108188344 B CN 108188344B
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- 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
- B22C5/04—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by grinding, blending, mixing, kneading, or stirring
- B22C5/0409—Blending, mixing, kneading or stirring; Methods therefor
- B22C5/0463—Plants
- B22C5/0468—Plants having feeding moulds, e.g. using gas
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- 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
- B22C5/04—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by grinding, blending, mixing, kneading, or stirring
- B22C5/0409—Blending, mixing, kneading or stirring; Methods therefor
- B22C5/044—Devices having a vertical stirrer shaft in a fixed receptacle
- B22C5/0445—Devices having a vertical stirrer shaft in a fixed receptacle the material flowing continuously through the device
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
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- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Nozzles (AREA)
Abstract
The invention relates to a sand supply system, which is suitable for a 3DP printer and is mainly applied to the field of 3DP printers for casting, and comprises a primary sand mulling mechanism and a secondary sand mulling mechanism, and is characterized in that the primary sand mulling mechanism is of an axisymmetric structure and is respectively provided with a sand silo, the bottom of each sand silo is respectively provided with a spiral conveying system, a sand mulling tank is arranged below the spiral conveying system, a sand dispersing device is fixed below an inlet of the sand mulling tank, and the bottom of the sand mulling tank is provided with stirring blades and a sand discharge port; the second grade mulling mechanism is the wind whirling mulling mechanism, including the wind whirling mulling jar, it has the branch sand piece to distribute on the wind whirling mulling jar, and the middle part sets up central pillar, and upper portion is opened symmetrically respectively has the entry, is close to the entry has set up the fan respectively, is close to the wind whirling mulling jar bottom outside is provided with the negative pressure sand outlet respectively, is close to fan department is provided with the malleation entry respectively.
Description
Technical Field
The invention relates to a sand supply system, which is suitable for a 3DP printer and is mainly applied to the field of 3DP printers for casting.
Background
In the current sand mold 3DP printing technology, the sand used for printing the sand mold needs to be mixed with a curing agent first, and then is combined with the resin sprayed by the printing head to form the sand mold with certain strength. In the traditional process, new and old sand is generally blended together, and then the curing agent is added, so that the addition amount of the curing agent is not easy to control, and more or less errors always exist.
Meanwhile, during the process of mixing the sand and the curing agent, the sand is firstly sucked from a low position to a sand mixing tank positioned at a high position. If the height of placing of mulling jar is too high from ground, then because the gravity of sand grain self, it is not good to use current sand equipment of inhaling to inhale the effect of sand, not only causes the pipeline to block up easily, in case once the volume of mulling is too big moreover, its homogeneity mixed with the curing agent also can't obtain guaranteeing. Meanwhile, the existing sand suction equipment adopts a pump to suck sand, so that the sand suction pump is easy to bear too much, the service life is shortened, and the sand mold printing cost is improved.
Disclosure of Invention
The invention overcomes the defects of the prior art, and the provided sand supply system improves the single sand mixing amount, ensures the sand mixing uniformity, reduces the lifting height of sand, reduces the load of a vacuum pump, prolongs the service life and reduces the equipment cost of 3 DP; and the reliability of the operation of the device is improved.
The sand supply system comprises a primary sand mixing mechanism and a secondary sand mixing mechanism, wherein the primary sand mixing mechanism comprises a sand bin, a spiral conveying system and a sand mixing tank, and the secondary sand mixing mechanism comprises a cyclone sand mixing system.
The first-stage sand mixing mechanism is of an axisymmetric structure, and the two sand bins are structurally identical and are respectively used for storing new sand and old sand. The bottom of sand silo is about 3 meters high apart from ground, inserts one set of screw delivery system respectively from its bottom, and this system level or slope down slightly guarantee can be smoothly carry the molding sand respectively in muddy sand jar and the muddy sand jar from the sand silo. The inlet of the sand mixing tank is arranged below the spiral conveying system, the sand dispersing device fixed in the tank body is arranged below the inlet, and the bottom of the sand mixing tank is provided with a stirring blade and a sand discharge port.
When the system is in a working state, the sand in the two sand bins is conveyed into the corresponding sand mixing tanks right below the sand bins through the spiral conveying system, and the aim is to mix new sand and old sand with the curing agent in different sand mixing tanks respectively so as to ensure the accuracy of the adding amount of the curing agent. Before the sand falls into the bottom of the mulling tank, the sand firstly passes through the sand dispersing device, then falls into the mulling tank, sand and a curing agent are stirred by the stirring blade, and the molding sand after being stirred for a period of time enters the secondary mulling mechanism through the sand discharge port. The distance between the sand mixing tank body and the ground is about 1 meter, the height of the tank body is about 1 meter, the capacity of a single tank body can reach 40KG, and the sand supply quantity of a plurality of devices can be ensured.
The sand dispersing device comprises a sand separating block and a spraying structure. The sand separating block is of a conical structure, the upper surface of the sand separating block is a conical surface, and the lower surface of the sand separating block is of any shape. Divide sand piece below to set up and spray the structure for spray the curing agent to the molding sand. In the process that the columnar molding sand is dispersed and falls, the spraying structure sprays the curing agent downwards to form a spraying path, so that the molding sand can be uniformly stained with the curing agent.
The spraying structure can be an atomizing nozzle structure, a high-pressure air gun structure and the like, and the effect of uniformly mixing the curing agent and the sand in the falling process of the molding sand can be achieved.
When the system is in a working state, molding sand enters the inlet of the sand mixing tank, irregular sand columns are dispersed into a sand ring shape with a hollow middle part under the action of the sand separating block, the spraying structure sprays the curing agent instantly along the falling of the sand ring, the curing agent is uniformly adhered to the inner part of the sand ring along a set spraying path, and the curing agent is uniformly mixed with the sand before the stirring blades act. The spraying path can be adjusted by adjusting the air pressure. The whole spraying process is controllable, namely the weight of the added sand is controlled, the optimal addition amount of the curing agent is obtained through calculation, the sand enters the instant spraying structure of the sand mixing tank to work, and the spraying structure finishes the curing agent spraying when the sand falls off. So far, the addition of the curing agent from the beginning to the end is just the calculated optimal curing agent amount.
The secondary sand mulling mechanism is an air-swirling sand mulling mechanism and comprises an air-swirling sand mulling tank, fusiform sand dividing blocks are distributed on the air-swirling sand mulling tank, a central pillar is arranged in the middle of the air-swirling sand mulling tank, the central pillar enables the inner space of the air-swirling sand mulling tank to be annular, and sand can rotate around the central pillar in the air-swirling sand mulling tank. The air-swirling sand mixing tank inlets are symmetrically formed in the upper portion of the air-swirling sand mixing tank respectively, the fans are arranged near the two inlets respectively, the negative-pressure sand outlets are arranged near the outer side of the bottom respectively, and the positive-pressure inlets are arranged at the positions, close to the fans, of the upper portion. The sand discharged from the sand discharge port of the sand mixing tank enters the air-swirling sand mixing tank after passing through an inlet of the air-swirling sand mixing tank, the fan provides positive pressure for the positive pressure inlet, and the vacuum negative pressure pump on the 3DP printing equipment provides negative pressure for the negative pressure sand outlet.
When the system is in a working state, firstly, the 3DP printing equipment sends out a sand shortage signal, the inlet of the air-swirling sand mixing tank is opened, new and old sand enters the air-swirling sand mixing tank, the fan immediately starts to work to provide positive pressure, the negative pressure vacuum pump of the sand shortage 3DP printing equipment is also started simultaneously, air swirl is formed instantaneously in the air-swirling sand mixing tank, so that the new and old sand is rotationally mixed along the tank wall and the central pillar, the new sand can catch up with the old sand in the rotating process due to the fact that the density of the new sand is lower than that of the old sand, and additionally, the shuttle-shaped sand distributing block is arranged on the wall of the air-swirling sand mixing tank, and the rotationally mixed new and old sand is further disturbed by the shuttle-shaped sand distributing block and is deeply mixed again. And as the new sand and the old sand fall in a mixed mode, the new sand and the old sand are finally discharged from the side of the started vacuum negative pressure pump and input into the 3DP printing equipment. The sand can be supplied by a single device, and the two negative pressure pumps can work simultaneously. The same structure can be expanded into three or four negative pressure outlets, and the sand discharge amount of the inlet of the air-swirling sand mixing tank can be increased only by increasing the power of the fan. And sand can be supplied to a plurality of devices simultaneously. The tank body is arranged on the ground, has the height of about 1 meter and is connected with the first-level sand mixing tank body. The height of the whole primary and secondary sand mixing system is about 3 meters, and the whole primary and secondary sand mixing system is as high as 3DP printing equipment with a sand mixing tank structure removed.
When the system works, the 3DP printing equipment sends out a sand lack signal, the fan provides positive pressure, the vacuum negative pressure pump provides negative pressure, and mixed sand is sucked into the sand storage bin of the 3DP printing equipment which sends out the signal through the negative pressure hose to prepare for printing.
Drawings
FIG. 1 is a schematic view of a first-stage sand mulling mechanism of the present invention
FIG. 2 is a schematic view of the structure of the sand dispersing device of the present invention
FIG. 3 is a schematic view of a cyclone sand mulling system of the present invention
FIG. 4 is an overall view of the system of the present invention
Wherein, 1, 2 sand bins; 3, a spiral conveying system; 4. 5, a sand mixing tank; 6, a sand discharge port; 7. a sand dispersing device; 701. dividing sand blocks; 702. a spray structure; 703. a spray path; 704. a hollow sand ring; 8. a stirring blade; 9, an inlet of the air-swirling sand mixing tank; 10, a fan; 11, a wind-rotating sand mixing tank; 12 a central post; 13 shuttle type sand separating blocks; 14, a negative pressure sand outlet; 15 a positive pressure inlet; 16-a negative pressure hose; 17-a sand storage bin; 18-vacuum negative pressure pump; 19-3DP printing apparatus
Detailed Description
Example 1
Fig. 1 is a schematic diagram of a first-stage sand mixing mechanism of the system of the present invention, which is an axisymmetric structure, and a sand silo 1 and a sand silo 2 are identical in structure and are used for storing new sand and used sand respectively. The bottom of the sand silo is 3 meters high away from the ground, and a set of spiral conveying system 3 is respectively connected to the bottom of the sand silo and slightly inclines downwards, so that the molding sand can be conveniently conveyed into the sand mixing tank 4 and the sand mixing tank 5 from the sand silo respectively. The inlet of the sand mixing tank is arranged below the screw conveying system, the sand dispersing device 7 fixed in the tank body is arranged below the inlet, and the bottom of the sand mixing tank is provided with a stirring blade 8 and a sand discharge port 6.
When the system is in a working state, the sand in the sand bins 1 and 2 is conveyed to the corresponding sand mixing tanks 4 and 5 right below the sand bins through the spiral conveying system 3, and the aim is to mix new sand and old sand with the curing agent in different sand mixing tanks respectively so as to ensure the accuracy of the adding amount of the curing agent. Before the sand falls into the bottom of the sand mixing tank, the sand firstly passes through the sand dispersing device 7 and then falls into the sand mixing tank, the sand and the curing agent are stirred by the stirring blade 8, and the sand after stirring for a period of time enters the secondary sand mixing mechanism through the sand discharge port 6.
As shown in fig. 2, which is a schematic view of the sand dispersing device 7 of the present invention, the sand dispersing device comprises a sand-separating block 701, and a spraying structure 702. The sand separating block is of a conical structure, the upper surface of the sand separating block is a conical surface, and the lower surface of the sand separating block is of any shape. A spraying structure 702 is arranged below the sand separating block 701 and used for spraying a curing agent to the molding sand. In the process of the columnar molding sand being dispersed and falling, the spraying structure sprays the curing agent downward to form a spraying path 703, which enables the molding sand to be uniformly stained with the curing agent.
The spraying structure 702 can be an atomizing nozzle structure, a high-pressure air gun structure, etc., and can achieve the effect of uniformly mixing the curing agent with the sand in the falling process of the molding sand.
When the system is in a working state, molding sand enters an inlet of the sand mixing tank, irregular sand columns are dispersed into a sand ring shape 704 with a hollow middle part under the action of the sand separating block 701, the spraying structure 702 instantly sprays curing agents along a set spraying path 703, the curing agents are uniformly adhered to the inside of the sand ring, and the curing agents are uniformly mixed with the sand before the stirring blades act. The spraying path can be adjusted by adjusting the air pressure. The whole spraying process is controllable, namely the weight of the added sand is controlled, the optimal curing agent adding amount is obtained through calculation, the sand enters the instant spraying structure 702 of the sand mixing tank 5 or 4 to work, and the spraying structure 702 finishes the curing agent spraying when the sand falls off. So far, the amount of the curing agent added from the beginning to the end is just the calculated optimal curing agent amount.
The secondary sand mulling mechanism is an air-swirling sand mulling mechanism, and is a schematic diagram of an air-swirling sand mulling system as shown in fig. 3. The upper part of the air-swirling sand mixing tank is symmetrically provided with air-swirling sand mixing tank inlets 9 respectively, the fans 10 are arranged near the two inlets respectively, the negative pressure sand outlets 14 are arranged near the outer side of the bottom respectively, and the positive pressure inlets 15 are arranged near the fans on the upper part respectively. The sand discharged from the sand discharge port of the sand mixing tank enters the air-swirling sand mixing tank 11 after passing through the inlet 9 of the air-swirling sand mixing tank, the fan 10 provides positive pressure for the positive pressure inlet 15, and the vacuum negative pressure pump on the 3DP printing equipment provides negative pressure for the negative pressure sand outlet 14.
When the system is in a working state, firstly, the 3DP printing equipment sends out a sand shortage signal, the inlet 9 of the air-swirling sand mixing tank is opened, new and old sand enters the air-swirling sand mixing tank 11, the fan 10 starts to work immediately, positive pressure is provided, the negative pressure vacuum pump of the sand shortage 3DP printing equipment is started at the same time, air swirl is formed instantaneously in the air-swirling sand mixing tank 11, so that the new and old sand is rotationally mixed along the tank wall and the central pillar 12, the new sand can catch up with the old sand in the rotating process due to the fact that the density of the new sand is lower than that of the old sand, and additionally, the shuttle-shaped sand distributing block 13 is arranged on the wall of the air-swirling sand mixing tank, and the rotationally mixed new and old sand is further disturbed by the shuttle-shaped sand distributing block 13 and is deeply mixed again. And as the new sand and the old sand fall in a mixed mode, the new sand and the old sand are finally discharged from the side of the started vacuum negative pressure pump and input into the 3DP printing equipment. The sand can be supplied by a single device, and the two negative pressure pumps can work simultaneously. The same structure can be expanded into three or four negative pressure outlets, and the sand discharge amount of the inlet 9 of the air-swirling sand mixing tank can be increased only by increasing the power of the fan 10. And sand can be supplied to a plurality of devices simultaneously. The tank body is arranged on the ground, has the height of about 1 meter and is connected with the first-level sand mixing tank body. The height of the whole primary and secondary sand mixing system is about 3 meters, and is as high as that of a 3DP printing device with a sand mixing tank structure removed.
As shown in fig. 4, when the 3DP printing device 19 sends out a sand lack signal, the blower 10 provides positive pressure, the vacuum negative pressure pump 18 provides negative pressure, and mixed sand is sucked into the sand storage bin 17 of the 3DP printing device through the negative pressure hose 16 to prepare for printing.
The sand mixing tank has the advantages that all sand mixing tank parts of a plurality of 3DP devices are removed, the sand mixing tank parts are integrated into a double-sand-bin structure, and printing sand is supplied to the plurality of 3DP devices. Thus, the complexity and height of the equipment are reduced, and the cost of the equipment is reduced. In the scheme of the invention, only two devices are taken as an example, the integrated sand supply system can be expanded into 3 or 4 devices and the like in practice by the same structure, and only the sand mulling capability of the primary sand mulling system and the secondary sand mulling system and the number of negative pressure outlets of the air-swirling sand mulling tank need to be increased.
Secondly, in the integrated system, the structure that new sand and old sand are separately mixed can ensure that a certain amount of sand is accurately matched with the corresponding curing agent amount, and the problem of more or less errors of the curing agent addition amount caused by adding the curing agent after the new sand and the old sand are mixed together in the old sand mixing scheme is solved.
And thirdly, the atomization nozzle structure added at the inlet of the new one-level sand mixing tank greatly improves the mixing uniformity of the sand and the curing agent, the new two-level sand mixing tank cyclone structure greatly improves the mixing degree of the new sand and the old sand, the two structures greatly improve the problem of the mixing uniformity of the sand, and the quality of the printed sand core product is improved.
Finally, the design of the positive and negative pressure sand suction structure meets the requirement of a wind rotation system, and reduces the load of the positive and negative air pressure pump; the molding sand does not need to be raised to the height of the prior art, and the load of the negative pressure pump is reduced. The optimization of the vacuum negative pressure pump and the vacuum negative pressure pump greatly prolongs the service life of the vacuum negative pressure pump and reduces the maintenance cost.
Claims (7)
1. An integrated sand supply system for a 3D printer comprises a primary sand mixing mechanism and a secondary sand mixing mechanism, and is characterized in that the primary sand mixing mechanism is of an axisymmetric structure and is respectively provided with sand bins, the bottoms of the sand bins are respectively provided with a spiral conveying system, a sand mixing tank is arranged below the spiral conveying system, a sand dispersing device is fixed below an inlet of the sand mixing tank, and the bottom of the sand mixing tank is provided with stirring blades and a sand discharge port; the second grade mulling mechanism is the wind whirling mulling mechanism, including the wind whirling mulling jar, it has the branch sand piece to distribute on the wind whirling mulling jar, and the middle part sets up central pillar, and upper portion is opened symmetrically respectively has the entry, is close to the entry has set up the fan respectively, is close to the wind whirling mulling jar bottom outside is provided with the negative pressure sand outlet respectively, is close to fan department is provided with the malleation entry respectively.
2. The integrated sand supply system according to claim 1, wherein said screw conveyor system is inclined horizontally or slightly downward to ensure smooth transfer of the molding sand from said sand silo to said sand-blending tank, respectively.
3. The integrated sand supply system according to claim 1, wherein the sand dispersing device comprises a sand-separating block and a spraying structure disposed below the sand-separating block for spraying the curing agent to the molding sand.
4. The integrated sand supply system according to claim 3, wherein the sand separating block has a tapered structure, the upper surface of the sand separating block is a tapered surface, and the lower surface of the sand separating block has an arbitrary shape.
5. The integrated sand supply system according to claim 3, wherein the spraying structure is an atomizer structure or a high pressure air gun structure, which can achieve the effect of uniformly mixing the curing agent with the sand during the falling of the molding sand.
6. The integrated sand supply system according to claim 1, wherein the sand segregating block is shuttle shaped.
7. The integrated sand supply system according to claim 1, wherein the center post makes the inner space of the air-swirling sand tank circular to facilitate the rotation of the molding sand therein around the center post.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810076974.6A CN108188344B (en) | 2018-01-30 | 2018-01-30 | Integrated sand supply system that 3D printer was used |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810076974.6A CN108188344B (en) | 2018-01-30 | 2018-01-30 | Integrated sand supply system that 3D printer was used |
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| CN108188344A CN108188344A (en) | 2018-06-22 |
| CN108188344B true CN108188344B (en) | 2023-01-06 |
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| CN112170778B (en) * | 2020-09-26 | 2022-05-24 | 共享智能装备有限公司 | Sand mixer and 3D printer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DK161743C (en) * | 1989-07-03 | 1992-02-17 | Niro Atomizer As | PROCEDURE AND APPARATUS FOR AGGLOMERATION OF A POWDER-SHAPED MATERIAL |
| CN1097493C (en) * | 1995-07-24 | 2003-01-01 | 库赫勒-瓦格纳工艺技术有限公司 | Dispersion device and method for bentonide dispersion |
| ES2142210B1 (en) * | 1996-11-06 | 2000-11-16 | Aleaciones De Metales Sinteriz | SYSTEM FOR THE INCORPORATION OF A SOLUBLE COMPONENT INTO A PREMIX OF INSOLUBLE POWDERS, BOTH WITH RESPECT TO THE SAME SOLVENT, AND AN APPARATUS FOR ITS REALIZATION. |
| US6367959B1 (en) * | 2000-02-19 | 2002-04-09 | General Kinematics Corporation | Method and apparatus for blending water with sand |
| DE102007027298A1 (en) * | 2007-06-11 | 2008-12-18 | Maschinenfabrik Gustav Eirich Gmbh & Co. Kg | Process for the treatment of foundry sand |
| JP5000744B2 (en) * | 2010-06-03 | 2012-08-15 | 株式会社清田鋳機 | Foundry sand recycling equipment |
| CN203565776U (en) * | 2013-11-19 | 2014-04-30 | 无锡市康晖机械制造有限公司 | Large-scale precoated sand mixing machine |
| BR112017026569A2 (en) * | 2015-06-11 | 2018-08-14 | Sintokogio, Ltd. | A regeneration method of molding sand, and reproduction equipment |
| CN205309221U (en) * | 2015-12-03 | 2016-06-15 | 重庆柳开机械铸造有限公司 | Sand mixer for casting |
| CN206492893U (en) * | 2016-12-05 | 2017-09-15 | 温州瑞尔金属制造有限公司 | A kind of new type resin sand mixer |
| CN106862483B (en) * | 2017-03-22 | 2019-07-09 | 青岛三运通用机械有限公司 | A kind of first mixed disk of multistage for being blended equipment |
| CN106799459B (en) * | 2017-03-22 | 2019-03-19 | 丁文铃 | A kind of sand mixer just mixing function with enhancing |
| CN208131915U (en) * | 2018-01-30 | 2018-11-23 | 共享智能装备有限公司 | A kind of integrated sand supply system of 3D printer |
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Address after: 298, ningshuo South Street, Yinchuan economic and Technological Development Zone, Ningxia Hui Autonomous Region Applicant after: KOCEL INTELLIGENT EQUIPMENT Co.,Ltd. Address before: 298, ningshuo South Street, Yinchuan economic and Technological Development Zone, Ningxia Hui Autonomous Region Applicant before: NINGXIA KOCEL PATTERN Co.,Ltd. |
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