CN109226696B - Sand shell core type pouring box - Google Patents
Sand shell core type pouring box Download PDFInfo
- Publication number
- CN109226696B CN109226696B CN201811345991.1A CN201811345991A CN109226696B CN 109226696 B CN109226696 B CN 109226696B CN 201811345991 A CN201811345991 A CN 201811345991A CN 109226696 B CN109226696 B CN 109226696B
- Authority
- CN
- China
- Prior art keywords
- sand
- box body
- box
- shell core
- core type
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000004576 sand Substances 0.000 title claims abstract description 78
- 244000035744 Hura crepitans Species 0.000 claims abstract description 41
- 238000005266 casting Methods 0.000 claims abstract description 29
- 230000000452 restraining effect Effects 0.000 claims abstract description 4
- 238000003825 pressing Methods 0.000 claims description 30
- 238000006073 displacement reaction Methods 0.000 claims description 9
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 239000002699 waste material Substances 0.000 abstract description 3
- 238000012856 packing Methods 0.000 abstract description 2
- 239000002985 plastic film Substances 0.000 description 6
- 229920006255 plastic film Polymers 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000005429 filling process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000003110 molding sand Substances 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 238000005058 metal casting Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 235000014347 soups Nutrition 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C21/00—Flasks; Accessories therefor
- B22C21/12—Accessories
- B22C21/14—Accessories for reinforcing or securing moulding materials or cores, e.g. gaggers, chaplets, pins, bars
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C21/00—Flasks; Accessories therefor
- B22C21/01—Flasks; Accessories therefor for vacuum-sealed moulding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/06—Vacuum casting, i.e. making use of vacuum to fill the mould
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Building Environments (AREA)
Abstract
The invention provides a sand shell core type pouring box, which comprises a sand box body, wherein a clamping and fixing part for restraining and fixing the sand shell core type is arranged in the sand box body, the clamping and fixing part is arranged at intervals between the sand shell core type and the box bottom, sand filling operation can be continuously completed at one time, sand filling efficiency is saved, the box body can be directly turned over and poured after casting is finished, at the moment, the clamping and fixing part still remains connected to the box body and cannot be mixed with casting, waste sand and filled sand, and the packing operation of fixing a pouring module for the sand shell core type by adopting a clamping plate and a pull rod is omitted.
Description
Technical Field
The invention belongs to the field of sand shell core type casting, and particularly relates to a vacuum negative pressure casting device for a sand shell core type of a small and medium-sized metal casting.
Background
At present, the traditional sand shell core type casting for producing small and medium-sized metal castings mainly adoptsBuried sandPouring mode; firstly, manufacturing a sand shell core type (namely a core mold) serving as a product cavity, wherein a unit mold consists of two core mold plates which are arranged in a bonding way, semicircular cavities a are densely distributed on a cavity plate surface of each core mold plate, the semicircular cavities between the two core mold plates after being bonded correspond to each other and are enclosed into a round cavity of a steel ball to be formed, molten steel runners c which are connected with each other and are used for connecting a main runner b are arranged between the round cavities a, as shown in fig. 1-3, a proper number of unit molds are bonded together and are fixed into a group of pouring molds by pull rods which are connected with the end plates, the group of pouring molds are arranged in a box body, filling sand is buried, the filling sand is filled with common external molding sand, the filling sand is buried at the height position of a box opening of the box body, a layer of plastic film is laid on the filling sand, the plastic film extends to the outside of the box body, a small amount of the filling sand is laid on the plastic film to press the plastic film, and the upper cover layer of the plastic film at the pouring gate is paid attention to avoid the plastic film from being destroyed by the pouring liquid soup; during pouring, molten steel enters the main pouring channel b and flows into each spherical cavity sequentially through the molten steel runner cThe ordinary outer molding sand correspondingly ensures the auxiliary shaping pouring and heat preservation operation of the core mould, and finally utilizes the high precision of the cavity of the core mould and the heat preservation shaping function of the ordinary outer molding sand, thereby meeting the high product quality requirement.
In order to improve the casting quality and meet the environmental protection requirement, the inventor previously improves the pouring system, namely, the box body is connected by negative pressure, the casting process of precoated sand is realized in a negative pressure environment, and the extracted casting flue gas is subjected to environmental protection treatment.
Whether casting is carried out in a negative pressure environment or not, a proper number of unit molds are required to be abutted together and fixed into a group of casting molds by the end plates and the pull rods for connecting the end plates, filling sand with certain thickness is paved in the box body to serve as bottom layer sand, the casting molds are placed on the bottom layer sand paved in a group, then filling sand is continuously injected, and the filling sand injection process is completed twice, namely the sand filling operation is required to be interrupted in the middle; the operation of collecting the castings after casting is finished is also difficult, because the baking of the high-temperature liquid injection is carried out, the carbonization of the film covering agent materials in the sand shell core is not complete and the strength is high, when the end plate and the connecting pull rod are lifted, the sand shell core is broken and scattered while being blocked by filling sand, the castings cannot be collected, and if the box body is directly turned over and toppled over, the end plate, the connecting pull rod, sand mould waste and the filling sand are mixed together, and the castings are difficult to sort and collect.
Disclosure of Invention
The invention aims to provide a sand shell core type pouring box, which aims to improve the boxing efficiency and the sorting and collecting efficiency of castings.
In order to achieve the above purpose, the present invention adopts the following technical scheme: the utility model provides a sand shell core type pouring box, includes sand box, its characterized in that: the clamping and fixing part is arranged in the sand box body and used for restraining and fixing the sand shell core type, and the clamping and fixing part is arranged at intervals between the sand shell core type and the box bottom.
The clamping and fixing parts are arranged in the box body of the sand box, the clamping and fixing parts can keep the sand shell core type and the box bottom to be arranged at intervals, so that a sand filling layer is not required to be paved on the box bottom, namely, the sand filling operation can be continuously completed once, the sand filling efficiency is saved, the box body can be directly turned over and poured after casting is finished, the clamping and fixing parts still remain connected to the box body at the moment and cannot be mixed in castings, waste sand and filled sand, the clamping plates and connecting rods are not required to be picked up from a height Wen Shadui to bring difficulty and danger, and meanwhile, the packing operation of a fixed casting module for the sand shell core type by adopting the clamping plates and the pull rods is omitted.
Drawings
FIG. 1 is a schematic view of the front cavity structure of the sand shell core upper plate of the present invention;
FIG. 2 is an enlarged partial view of section I of FIG. 1;
FIG. 3 is a schematic illustration of the mating of the upper and lower plates of the sand shell core of the present invention;
FIG. 4 is a schematic view of the structure of the flask of the present invention; FIG. 5 is a cross-sectional view A-A of FIG. 4;
FIG. 6 is a partial cross-sectional view of the movable platen in mating relationship with the flask housing;
FIGS. 7 and 8 are schematic perspective views showing the structure of the flask according to the present invention.
Detailed Description
The utility model provides a sand shell core type pouring box, includes sand box 10, sets up the centre gripping fixed part that retrains and fix sand shell core type A in the sand box 10, and centre gripping fixed part keeps arranging for the interval between sand shell core type A and the bottom of the case.
According to the scheme, the clamping and fixing component is additionally arranged on the original sand box, the sand shell core type A prepared in the forming process is directly placed in the sand box, the sand shell core type A is fixed by the clamping and fixing component, the independent constraint fixing and hoisting and boxing process of the sand shell core type A is omitted, and due to the fact that proper space between the sand shell core type A and the box bottom is reserved when the sand shell core type A is fixed, structural guarantee is provided for one-time continuous operation of the sand filling process, namely the sand filling process is simplified, and particularly, the sand filling process can be completed at one time instead of discontinuous sand filling operation in midway, meanwhile, the clamping and fixing component is arranged on the sand box, and when sand pouring sorting is adopted in a tipping mode, the clamping and fixing component is not mixed in a sand pile, so that great convenience is provided for subsequent sorting and casting formed products.
The clamping and fixing part comprises a sand box body 10, wherein a movable pressing plate 20 is arranged in the sand box body 10, the interval between a base plate 11 and the movable pressing plate 20 is adjustable, and the inter-plate area forms a clamping and restraining area of the sand shell core type A.
Since the unit mold is composed of two core mold plates arranged in a bonded manner, a specific structure is described in the background art. The outer plate surfaces of two adjacent unit molds are restrained together in a manner of being attached to each other for centralized fixation, which is a reasonable scheme capable of simplifying the casting process, so that the clamping and fixing problem can be solved by adopting a scheme that the movable pressing plate 20 is parallel and opposite to the plate surfaces of the base plate 11.
The substrate 11 is formed by inner wall plates in the sand box body 10, the plate surface of the movable pressing plate 20 is parallel to the opposite wall plates on the box body, the ejector rod 21 perpendicular to the plate surface on the outer side plate surface of the movable pressing plate 20 penetrates through a through hole formed in the box wall on the adjacent side and extends to the outside of the box body, and a displacement adjusting and locking unit is arranged between the ejector rod 21 and the sand box body 10.
In the above scheme, the base plate 11 is arranged in a fixed manner, the movable pressing plate 20 is arranged in a movable manner, and of course, the base plate 11 can also be selected in a movable manner, when the base plate needs to be used in the fixed scheme, the inner wall of the sand box can be selected as the base plate, the base plate is suitable for the newly processed and produced sand box, and a plate body can be additionally arranged on the box wall.
In order to realize the position adjustment and the position fixation of the movable pressing plate 20, various schemes can be adopted, and a preferred scheme is that the displacement adjustment and locking unit is a screw-nut mechanism, and the screw-nut mechanism is adopted, so that the processing of parts is convenient, the cost is low and the operation is convenient.
The following specifically discloses two schemes:
the first scheme is that the displacement adjusting and locking unit comprises a nut 30 which is screwed on the outer section of the ejector rod 21, and the outer end surface of the nut 30 and the resisting part 40 form resisting fit.
The second scheme is that the displacement adjusting and locking unit comprises a nut 30 which is in threaded connection with the outer section of the ejector rod 21, the nut 30 is arranged on the outer side wall of the sand box body 10, and the inner end of the ejector rod 21 and the outer side plate surface of the movable pressing plate 20 form circumferential rotation and axial limiting fit.
In the first scheme, the ejector rod 21 only axially displaces to drive the movable pressing plate to displace, and the nut 30 only rotates to fix the axial position; in the second scheme, the nut 30 is fixed in position, i.e. axially and circumferentially, and the inner end of the ejector rod 21 and the movable pressing plate 20 are axially limited and circumferentially rotated, so that the movable pressing plate 20 is ensured to be displaced, i.e. the moving direction of the movable pressing plate 20 is ensured to be perpendicular to the plate surface direction of the movable pressing plate 20. The screw-nut mechanism shown in the drawings is a very convenient and simple structure, namely, the outer periphery of the nut 30 radially protrudes to extend the handle wing 31, so that the screw-nut mechanism is convenient to be matched with tools such as a sleeve or a stress application rod and the like for application, and the outer end of the nut 30 is provided with a resisting part to realize the limit of the nut 30 moving outwards along the axial direction, thereby ensuring the realization of clamping.
The flat rod piece 60 is arranged in the sand box body 10, and the rod piece 60 is arranged at a distance from the bottom of the sand box body 10 and is positioned below the movable pressing plate 20.
In order to realize the interval arrangement between the sand shell core type A and the box bottom, the above rod piece 60 arrangement scheme is adopted, namely the sand shell core type A is arranged above the box bottom at a certain interval, the rod piece 60 is used for arranging the sand shell core type A on one hand, so that the bottom surface of the sand shell core type A keeps a proper interval with the box bottom, filling sand arrives at the same time, the stability of the sand shell core type A and the integrity of each cavity are ensured, and in addition, the deformation phenomenon possibly generated during negative pressure casting of the sand box body 10 is also increased.
The movable platen 20 is a square plate and the lower edge of the movable platen 20 is disposed adjacent to or in contact with the rod 60. The edge profile of the movable pressing plate 20 is selected to be square so as to be consistent with the shape of the plate surface of the sand shell core type A, and the lower edge of the movable pressing plate 20 is selected to be arranged close to or in contact with the rod piece 60, so that the movable pressing plate 20 can be ensured to be placed on the rod piece 60, the posture of the movable pressing plate 20 can be ensured, and meanwhile, the ejector rod 21 is not required to bear bending moment and the wall of the sand box body 10 is not required to bear deformation caused by extra external force.
Preferably, two parallel, spaced apart, horizontally disposed bars 60 are disposed corresponding to one movable platen 20. This ensures both support of the sand core type a and posture retention of the auxiliary movable platen 20, and allows the filled sand to reach the bottom of the sand core type a.
In order to realize negative pressure casting, an air exhaust pipeline which is communicated with an inner cavity and a vacuumizing unit is arranged on the sand box body 10, a push rod 21 connected with a movable pressing plate 20 is in sealing fit with a penetrating hole on the sand box body 10, the bottom of the sand box body 10 is of a sandwich structure consisting of an inner bottom 12 and an outer bottom 13, a small hole is formed in the inner bottom 12 to be communicated with a sandwich cavity and a box chamber for accommodating a sand mold, one end of the air exhaust pipeline 50 is communicated with the sandwich cavity, and the other end of the air exhaust pipeline is arranged on the outer wall of the side wall of the sand box body 10 and protrudes out to facilitate connection of a pipe head. It should be noted that the displacement adjusting and locking unit should be arranged to cooperate with the suction pipe of the evacuation unit to avoid interference, and a seal is provided between the ejector pins 21 and the through holes in the flask 10 to avoid damaging the negative pressure casting environment.
Claims (6)
1. The utility model provides a sand shell core type pouring box, includes sand box (10), its characterized in that: the sand box body (10) is internally provided with a clamping and fixing part for restraining and fixing the sand shell core type (A), the clamping and fixing part maintains the space arrangement between the sand shell core type (A) and the box bottom, and filling sand is filled into a space area between the sand shell core type (A) and the box bottom and is buried into the height position of a box opening of the sand box body (10);
the clamping and fixing part comprises a movable pressing plate (20) arranged in a sand box body (10), a base plate (11) is arranged in the sand box body (10), the interval between the base plate (11) and the movable pressing plate (20) is adjustable, and a clamping constraint area of a sand shell core type (A) is formed in the inter-plate area;
the base plate (11) is arranged on the inner plate surface of the box wall of the sand box body (10), the plate surface of the movable pressing plate (20) is parallel to the opposite box wall plate surface on the box body, the ejector rod (21) which is arranged on the outer plate surface of the movable pressing plate (20) and is perpendicular to the plate surface is penetrated from the through hole formed in the box wall on the adjacent side and extends to the outside of the sand box body (10), and a displacement adjusting and locking unit is arranged between the ejector rod (21) and the sand box body (10);
a horizontally arranged rod piece (60) is arranged in the sand box body (10), and the rod piece (60) is arranged at a distance from the bottom of the sand box body (10) and is positioned below the movable pressing plate (20);
the movable pressing plate (20) is a square plate, the lower edge of the movable pressing plate (20) is in contact arrangement with the rod piece (60), and the plate surface of the movable pressing plate (20) is perpendicular to the rod length direction of the rod piece (60);
two bars (60) which are horizontally arranged at intervals in parallel are arranged corresponding to one movable pressing plate (20);
the sand shell core type (A) placed on the rod piece (60) is separated from the box bottom by a distance, and the interval space is filled with filling sand.
2. The casting box according to claim 1, wherein: the displacement adjusting and locking unit is a screw-nut mechanism.
3. The casting box according to claim 2, characterized in that: the displacement adjusting and locking unit comprises a nut (30) which is in threaded connection with the outer section of the ejector rod (21), and the outer end surface of the nut (30) is in resisting fit with the resisting part (40).
4. The casting box according to claim 2, characterized in that: the displacement adjusting and locking unit comprises a nut (30) which is in threaded connection with the outer section of the ejector rod (21), the nut (30) is arranged on the outer side wall of the sand box body (10), and the inner end of the ejector rod (21) and the movable pressing plate (20)
Forms circumferential rotation and axial limit fit between the outer side plate surfaces.
5. The casting box according to any one of claims 1 to 4, wherein: an air exhaust pipeline (50) which is communicated with the inner cavity and the vacuumizing unit is arranged on the sand box body (10), and a push rod (21) connected with the movable pressing plate (20) is in sealing fit with a penetrating hole on the sand box body (10).
6. The casting box according to claim 5, wherein: sand box body (10)
The box bottom of the sand box is of a sandwich structure consisting of an inner bottom (12) and an outer bottom (13), a filter screen (121) is arranged on the inner bottom (12), the filter screen (121) is communicated with a sandwich cavity and a box chamber for accommodating a sand shell core (A), one end of an air exhaust pipeline (50) is communicated with the sandwich cavity, and the other end of the air exhaust pipeline is arranged on the outer wall of the side wall of the sand box body (10) and protrudes out of a pipe head which is convenient to connect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811345991.1A CN109226696B (en) | 2018-11-13 | 2018-11-13 | Sand shell core type pouring box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811345991.1A CN109226696B (en) | 2018-11-13 | 2018-11-13 | Sand shell core type pouring box |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109226696A CN109226696A (en) | 2019-01-18 |
| CN109226696B true CN109226696B (en) | 2024-04-12 |
Family
ID=65078357
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811345991.1A Active CN109226696B (en) | 2018-11-13 | 2018-11-13 | Sand shell core type pouring box |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109226696B (en) |
Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| DE2634894A1 (en) * | 1976-08-03 | 1978-02-09 | Emg Eisen Und Metallguss Gmbh | Mouldless multiple casting arrangement - gives high recovery of moulding sand with combustion of binder and using multiple cores |
| US5354196A (en) * | 1992-01-31 | 1994-10-11 | Zeev Wertheimer | Clamping assembly for an injection moulding apparatus |
| CN201880860U (en) * | 2010-11-27 | 2011-06-29 | 大连远景铸造有限公司 | Precoated sand shell modeling mold |
| CN202155481U (en) * | 2011-05-30 | 2012-03-07 | 南车戚墅堰机车车辆工艺研究所有限公司 | Tool for casting |
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| CN104801676A (en) * | 2015-03-03 | 2015-07-29 | 共享铸钢有限公司 | Combined sand mold structure convenient to fix and manufacturing method of combined sand mold |
| CN106077491A (en) * | 2016-08-09 | 2016-11-09 | 长沙金龙铸造实业有限公司 | A kind of casting moulding system and production method |
| CN106222534A (en) * | 2016-08-24 | 2016-12-14 | 衢州顺丰汽车部件有限公司 | A kind of casting technique of magnesium iron casing |
| CN107243608A (en) * | 2017-05-27 | 2017-10-13 | 共享装备股份有限公司 | Smallclothes core group core the core of the card device and casting mold and casting method |
| CN107876705A (en) * | 2017-12-28 | 2018-04-06 | 江苏华东风能科技有限公司 | Bottom pouring type pouring device for small and medium-sized casting |
| TW201817512A (en) * | 2016-11-04 | 2018-05-16 | 連雲港源鈺金屬製品有限公司 | Method of sand-filling molding using 3D printing shell mold using a 3D printer and sand casting method so as achieve the effects of rapid production of molds, and reducing consumables and pollution |
| CN209062092U (en) * | 2018-11-13 | 2019-07-05 | 黄山中发耐磨材料有限公司 | Arenaceous shell core pattern pouring box |
-
2018
- 2018-11-13 CN CN201811345991.1A patent/CN109226696B/en active Active
Patent Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| DE2634894A1 (en) * | 1976-08-03 | 1978-02-09 | Emg Eisen Und Metallguss Gmbh | Mouldless multiple casting arrangement - gives high recovery of moulding sand with combustion of binder and using multiple cores |
| US5354196A (en) * | 1992-01-31 | 1994-10-11 | Zeev Wertheimer | Clamping assembly for an injection moulding apparatus |
| CN201880860U (en) * | 2010-11-27 | 2011-06-29 | 大连远景铸造有限公司 | Precoated sand shell modeling mold |
| CN202155481U (en) * | 2011-05-30 | 2012-03-07 | 南车戚墅堰机车车辆工艺研究所有限公司 | Tool for casting |
| CN203437599U (en) * | 2013-07-03 | 2014-02-19 | 黄山泰鑫耐磨材料有限公司 | Vacuum negative-pressure sand box assembly |
| CN103341592A (en) * | 2013-07-03 | 2013-10-09 | 黄山泰鑫耐磨材料有限公司 | Laminating sand mould vacuum-assist pouring method and system |
| KR200470179Y1 (en) * | 2013-09-17 | 2013-12-02 | 청송기계(주) | The flask with fixing device for shell-mold |
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| CN106222534A (en) * | 2016-08-24 | 2016-12-14 | 衢州顺丰汽车部件有限公司 | A kind of casting technique of magnesium iron casing |
| TW201817512A (en) * | 2016-11-04 | 2018-05-16 | 連雲港源鈺金屬製品有限公司 | Method of sand-filling molding using 3D printing shell mold using a 3D printer and sand casting method so as achieve the effects of rapid production of molds, and reducing consumables and pollution |
| CN107243608A (en) * | 2017-05-27 | 2017-10-13 | 共享装备股份有限公司 | Smallclothes core group core the core of the card device and casting mold and casting method |
| CN107876705A (en) * | 2017-12-28 | 2018-04-06 | 江苏华东风能科技有限公司 | Bottom pouring type pouring device for small and medium-sized casting |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN109226696A (en) | 2019-01-18 |
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Country or region after: China Address after: 245700 Huangshan Industrial Park, Huangshan City, Anhui Province Applicant after: Huangshan Zhongfa wear resistant material technology Co.,Ltd. Address before: 245700 Huangshan Industrial Park, Huangshan City, Anhui Province Applicant before: HUANGSHAN ZHONGFA WEAR RESISTANT MATERIAL CO.,LTD. Country or region before: China |
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