CN113182535B - Precision turning equipment for optical element - Google Patents
Precision turning equipment for optical element Download PDFInfo
- Publication number
- CN113182535B CN113182535B CN202110427542.7A CN202110427542A CN113182535B CN 113182535 B CN113182535 B CN 113182535B CN 202110427542 A CN202110427542 A CN 202110427542A CN 113182535 B CN113182535 B CN 113182535B
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- sliding
- block
- rotating disc
- optical element
- rotating
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- 230000003287 optical effect Effects 0.000 title claims abstract description 66
- 238000001816 cooling Methods 0.000 claims abstract description 20
- 238000001179 sorption measurement Methods 0.000 claims abstract description 14
- 230000005540 biological transmission Effects 0.000 claims abstract description 8
- 238000001125 extrusion Methods 0.000 claims description 14
- 238000005096 rolling process Methods 0.000 claims description 12
- 230000017525 heat dissipation Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 238000012545 processing Methods 0.000 abstract description 11
- 238000005520 cutting process Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 description 6
- 230000001788 irregular Effects 0.000 description 5
- 238000013459 approach Methods 0.000 description 3
- 238000003754 machining Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B5/00—Turning-machines or devices specially adapted for particular work; Accessories specially adapted therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
- B23Q11/10—Arrangements for cooling or lubricating tools or work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
- B23Q3/06—Work-clamping means
- B23Q3/08—Work-clamping means other than mechanically-actuated
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
- B23Q3/06—Work-clamping means
- B23Q3/08—Work-clamping means other than mechanically-actuated
- B23Q3/088—Work-clamping means other than mechanically-actuated using vacuum means
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mechanical Light Control Or Optical Switches (AREA)
- Turning (AREA)
Abstract
The invention discloses precision turning processing equipment for an optical element, which relates to the technical field of optical element processing, and comprises a fixed frame, a rotating mechanism, a cutting frame, a rotating disc, an adsorption component, a sliding block, an adjustable cooling mechanism, a fixed component and a transmission component.
Description
Technical Field
The invention relates to the technical field of optical element processing, in particular to precision turning equipment for an optical element.
Background
With the social development, the applications of optical elements, such as lenses, light rays, plane mirrors, gratings, optical isolators, beam splitters, etc., are more and more widely applied, and the requirements on the number and the precision of the optical elements to be processed are higher and higher, and the equipment for processing the optical elements is frequently updated and replaced so as to achieve higher precision and efficiency.
The anchor clamps of the optical element processing equipment who uses at present are traditional anchor clamps usually, can only carry out the centre gripping to the optical element of fixed shape, often anchor clamps can't be to its firm fixed when needs add optical element or the optical element of irregular shape to multiple shape, optical element can not laminate well, lead to optical element to damage because of single-point extrusion force is too big easily, add man-hour at optical element simultaneously, high temperature also can cause harmful effects to it, need add at present and cool down to it through extra equipment with man-hour, not only operate inconveniently, and because the cutting of blade, lead to cooling down the position to take place the skew to influence the cooling effect very easily.
Disclosure of Invention
The invention aims to provide precision turning processing equipment for optical elements, which aims to solve the problems that the optical elements with irregular shapes cannot be stably clamped and fixed in the prior art, and the cooling effect is affected by the deviation of a cooling position easily caused when a blade is subjected to cutting work.
The utility model provides an optical element's accurate lathe work equipment, includes mount, slewing mechanism and cuts the frame, the fixed rolling disc that is equipped with in slewing mechanism's the pivot, the one side that slewing mechanism was kept away from to the rolling disc is equipped with adsorption component, be equipped with the slide rail along its radial equipartition on the rolling disc, slide rail sliding connection has the slider, be equipped with the adjustable cooling body who is used for cooling optical element on the slider and be used for fixed optical element's fixed subassembly, be connected through drive assembly between slider and the adsorption component, be equipped with the drive on the rolling disc the gliding actuating mechanism of slider, the gliding in-process of slider drives fixed subassembly and adsorption component and fixes optical element.
Preferably, the driving mechanism comprises a gear set and a screw rod, the screw rod is located in the slide rail and is rotationally connected with the rotating disc, a motor is fixedly arranged in the rotating disc and is in transmission connection with the screw rod through the gear set, and the screw rod is in threaded connection with the sliding block.
Preferably, fixed subassembly include with slider inside wall sliding connection's fixed block, one side that the rolling disc was kept away from to the fixed block is the slope form, and the inclined plane is provided with trapezoidal line, be equipped with between fixed block and the rolling disc and rotate the screw rod of being connected with the slider, the one end that the screw rod is close to the fixed block is rotated and is connected with the extrusion piece, and other end threaded connection has the nut of being connected with the slider rotation, one side that the extrusion piece is close to the rolling disc centre of a circle is equipped with the block rubber.
Preferably, the adsorption component comprises a sliding plate which is slidably connected with the circular center part of the rotating disc, one side of the sliding plate is connected with the rotating shaft through a return spring, and the other side of the sliding plate is connected with the sucking disc through a sucking disc column.
Preferably, the transmission mechanism comprises a connecting rod and a sliding ring which is sleeved on the rotating shaft in a sliding manner, the sliding ring is connected with the sliding plate through a telescopic rod, one end of the connecting rod is hinged with the sliding block, and the other end of the connecting rod is hinged with the sliding ring.
Preferably, the adjustable cooling mechanism comprises a fixed spring, the slider is provided with a spring groove and a polygonal opening communicated with the spring groove, the fixed spring is located in the spring groove, a polygonal column is connected in the polygonal opening in a sliding manner, the polygonal column is fixedly connected with the fixed spring, and one end, far away from the rotating disc, of the polygonal column is fixedly connected with a blade.
Preferably, a plurality of heat dissipation holes are uniformly formed in the surface of the rotating disc.
The invention has the advantages that: the device can be through the adsorption component, drive mechanism, including a motor, an end cap, a controller, and a cover plate, slide rail, slider and fixed subassembly's setting, it is very firm to make irregular shape's optical element also can be fixed man-hour, make it can reduce the vibration man-hour, improve the machining precision, and be difficult to damage, the device can also be through the setting of cooling body, make optical element can in time be taken away by the air current at the high temperature that adds man-hour production, avoid optical element to influence its processing effect at the high temperature that adds man-hour production, and this cooling body can be according to demand adjustment cooling efficiency, the device can also pass through the louvre on the rolling disc, subtract heavy rotating part, and improve the radiating efficiency.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a side view of the rotating disk of the present invention;
FIG. 3 is a partial cross-sectional view of the present invention;
FIG. 4 is an enlarged view of a portion of FIG. 3 at A;
figure 5 is a side view of the slider of the present invention.
The symbols in the drawings are: 1. the device comprises a fixed frame, 2, a cutting frame, 3, a rotating mechanism, 4, a rotating disc, 51, a sliding plate, 52, a return spring, 53, a sucker column, 54, a sucker, 61, a connecting rod, 62, a sliding ring, 63, a telescopic rod, 71, a gear set, 72, a screw rod, 8, a sliding rail, 9, a sliding block, 10, a motor, 111, a nut, 112, a screw rod, 113, an extrusion block, 114, a rubber block, 12, a fixed block, 131, a fixed spring, 132, a polygonal column, 133 and a blade.
Detailed Description
The following detailed description of the present invention is provided to enable those skilled in the art to more fully understand the technical spirit and technical solutions of the present invention through the description of the embodiments with reference to the accompanying drawings.
As shown in fig. 1-5, the present invention provides a precision turning device for optical elements, which includes a fixed frame 1, a rotating mechanism 3 and a cutting frame 2, wherein a rotating disc 4 is fixedly disposed on a rotating shaft of the rotating mechanism 3, an adsorption component is disposed on one side of the rotating disc 4 away from the rotating mechanism 3, slide rails 8 are uniformly disposed on the rotating disc 4 along a radial direction of the rotating disc 4, the slide rails 8 are slidably connected with a slide block 9, an adjustable cooling mechanism for cooling the optical elements and a fixing component for fixing the optical elements are disposed on the slide block 9, the slide block 9 and the adsorption component are connected by a transmission component, a driving mechanism for driving the slide block 9 to slide is disposed on the rotating disc 4, and the slide block 9 drives the fixing component and the adsorption component to fix the optical elements in a sliding process.
In this embodiment, actuating mechanism includes gear train 71 and lead screw 72, lead screw 72 is located slide rail 8 and rotates with rolling disc 4 and is connected, rolling disc 4 internal fixation is equipped with motor 10, motor 10 passes through gear train 71 and is connected with screw drive, lead screw 72 and slider 9 threaded connection, motor 10 rotate and drive the lead screw through gear train 71 and rotate, and the lead screw rotates and drives slider 9 and slide in the spout.
In this embodiment, fixed subassembly includes fixed block 12 with slider 9 inside wall sliding connection, one side that carousel 4 was kept away from to fixed block 12 is the slope form, and the inclined plane is provided with trapezoidal line, be equipped with between fixed block 12 and the carousel 4 and rotate the screw rod 112 of being connected with slider 9, the one end rotation that screw rod 112 is close to fixed block 12 is connected with extrusion piece 113, and other end threaded connection has the nut 111 of being connected with slider 9 rotation, one side that extrusion piece 113 is close to the 4 centre of a circle of carousel is equipped with rubber block 114, and slider 9 slides and drives fixed subassembly and remove, and rubber block 114 on the extrusion piece 113 contacts with optical element's lateral wall earlier, and fixed block 12 can play limiting displacement to optical element, through rotating nut 111, makes extrusion piece 113 on the screw rod 112 be close to optical element's lateral wall gradually, realizes the fixed to optical element of different shapes.
In this embodiment, the suction assembly includes a sliding plate 51 slidably connected to the circular center of the rotating disc 4, one side of the sliding plate 51 is connected to the rotating shaft through a return spring 52, the other side is connected to a suction cup 54 through a suction cup column 53, and the suction cup 54 is sucked on the optical element, so that the fixing effect of the optical element can be improved.
In this embodiment, the transmission mechanism includes a connecting rod 61 and a sliding ring 62 slidably sleeved on the rotating shaft, the sliding ring 62 is connected with the sliding plate 51 through an expansion link 63, one end of the connecting rod 61 is hinged to the sliding block 9, the other end of the connecting rod is hinged to the sliding ring 62, the sliding block 9 moves upward to drive the end of the connecting rod 61 to move together, the connecting rod 61 gradually approaches to a vertical state, the other end of the connecting rod 61 pushes the sliding plate with the suction cup 54 to move to one side of the optical element, the suction cup 54 is pressed against the optical element, the sliding block 9 moves downward to drive the end of the connecting rod 61 to move in a reverse direction, the connecting rod 61 pulls the sliding plate with the suction cup 54 to move towards the rotating mechanism 3, and negative pressure is generated between the suction cup 54 and the optical element and sucks the optical element.
In this embodiment, the adjustable cooling mechanism includes a fixed spring 131, a spring groove and a polygonal opening communicated with the spring groove are formed in the slider 9, the fixed spring 131 is located in the spring groove, a polygonal column 132 is slidably connected in the polygonal opening, the polygonal column 132 is fixedly connected with the fixed spring 131, one end of the polygonal column 132, which is far away from the rotating disc 4, is fixedly connected with a blade 133, the blade 133 is pulled out to the right side, the polygonal column 132 is pulled out from the right end face of the slider 9, the blade 133 is loosened after each polygonal column 132 rotates by a certain angle as required, and is retracted and fixed in the slider 9 through the fixed spring 131, so that the angle of the blade 133 is adjusted, and when the rotating mechanism 3 drives the rotating disc 4 to rotate, airflow is generated when the blade 133 rotates, and heat generated during processing is taken away.
In this embodiment, a plurality of heat dissipation holes are uniformly formed in the surface of the rotating disc 4, and the heat dissipation effect can be improved by the heat dissipation holes.
The working process and principle are as follows:
when an irregular-shaped optical element needs to be machined, firstly, the motor 10 is started, the motor 10 drives the sliding block 9 to move towards one side far away from the circle center of the rotating disc 4 through the gear set 71 and the screw 72, when the sliding block 9 moves towards the outer side, the end part of the connecting rod 61 is driven to move together, the connecting rod 61 gradually approaches to the vertical state, the other end of the connecting rod 61 moves towards one side of the optical element, the telescopic rod 63 is pushed, the telescopic rod 63 is firstly compressed, the sliding plate 51 starts to move towards one side of the optical element when being compressed to the limit, the sliding plate 51 pushes the sucker column 53 to drive the sucker 54 to approach to the optical element together, then the optical element is vertically placed among the plurality of extrusion blocks 113 and is pressed on the sucker 54, and then the motor 10 is reversely rotated, the slider 9 drives the rubber block 114 on the extrusion block 113 to move towards the side edge of the optical element, the connecting rod 61 drives the slip ring 62 to be far away from the rotating disc 4, the telescopic rod 63 and the reset spring 52 are reset, when the rubber block 114 on the extrusion block 113 is in contact with the side edge of the optical element, the sliding plate drives the sucker column 53 to move towards the side far away from the optical element, negative pressure is generated between the sucker 54 and the optical element and sucks the optical element, then the motor 10 is turned off, the rubber blocks 114 on the extrusion block 113 are all extruded on the side edge of the optical element through the movement of the screw 112 by rotating the nut 111 corresponding to the rubber block 114 which is not extruded on the side edge of the optical element, and at the moment, the side edge of the fixed block 12 clamps the right side edge of the optical element, and the fixing work of the optical element with an irregular shape is completed;
then each blade 133 is pulled out towards the right side, so that the polygonal column 132 is pulled out from the right end face of the sliding block 9, each polygonal column 132 rotates for a certain angle as required, the blade 133 is loosened, the polygonal column is retracted and fixed in the sliding block 9 through the fixing spring 131, then the rotating mechanism 3 is started, the rotating mechanism 3 drives the rotating disc 4 and parts connected with the rotating disc to rotate together, the cutting frame 2 moves towards the optical element to process the optical element, meanwhile, air flow is generated when a plurality of blades 133 rotate, part of heat generated during processing is rapidly taken away, and after the processing is completed, the processed optical element is taken out through reverse operation.
The device can be through the adsorption component, drive mechanism, motor 10, slide rail 8, slider 9 and fixed subassembly's setting, it is very firm to make irregular shape's optical element also can be adding man-hour fixed, make it can reduce the vibration adding man-hour, improve the machining precision, and be difficult to damage, the device can also pass through cooling mechanism's setting, make optical element can in time be taken away by the air current adding man-hour high temperature that produces, avoid optical element to influence its processing effect adding man-hour high temperature that produces, and this cooling mechanism can adjust cooling efficiency according to the demand, the device can also pass through the louvre on the rolling disc 4, subtract heavy rotating part, and improve the radiating efficiency.
The invention is described above with reference to the accompanying drawings, it is obvious that the specific implementation of the invention is not limited by the above-mentioned manner, and it is within the scope of the invention to adopt various insubstantial modifications of the inventive concept and solution of the invention, or to apply the inventive concept and solution directly to other applications without modification.
Claims (3)
1. The utility model provides an optical element's precision lathe work equipment, includes mount (1), slewing mechanism (3) and cuts frame (2), its characterized in that: a rotating disc (4) is fixedly arranged on a rotating shaft of the rotating mechanism (3), an adsorption component is arranged on one side, away from the rotating mechanism (3), of the rotating disc (4), slide rails (8) are uniformly distributed on the rotating disc (4) along the radial direction of the rotating disc, the slide rails (8) are connected with a slide block (9) in a sliding mode, an adjustable cooling mechanism for cooling an optical element and a fixing component for fixing the optical element are arranged on the slide block (9), the slide block (9) is connected with the adsorption component through a transmission component, a driving mechanism for driving the slide block (9) to slide is arranged on the rotating disc (4), and the fixing component and the adsorption component are driven to fix the optical element in the sliding process of the slide block (9);
the driving mechanism comprises a gear set (71) and a screw rod (72), the screw rod (72) is positioned in the sliding rail (8) and is rotationally connected with the rotating disc (4), a motor (10) is fixedly arranged in the rotating disc (4), the motor (10) is in transmission connection with the screw rod through the gear set (71), and the screw rod (72) is in threaded connection with the sliding block (9);
the fixing assembly comprises a fixing block (12) which is in sliding connection with the inner side wall of the sliding block (9), one side, far away from the rotating disc (4), of the fixing block (12) is inclined, trapezoidal lines are arranged on the inclined surface, a screw rod (112) which is in rotating connection with the sliding block (9) is arranged between the fixing block (12) and the rotating disc (4), one end, close to the fixing block (12), of the screw rod (112) is in rotating connection with an extrusion block (113), the other end of the screw rod is in threaded connection with a nut (111) which is in rotating connection with the sliding block (9), and one side, close to the circle center of the rotating disc (4), of the extrusion block (113) is provided with a rubber block (114);
the adsorption component comprises a sliding plate (51) which is connected with the circular center part of the rotating disc (4) in a sliding mode, one side of the sliding plate (51) is connected with the rotating shaft through a return spring (52), and the other side of the sliding plate (51) is connected with a sucker (54) through a sucker column (53);
the transmission mechanism comprises a connecting rod (61) and a sliding ring (62) which is sleeved on the rotating shaft in a sliding mode, the sliding ring (62) is connected with the sliding plate (51) through a telescopic rod (63), one end of the connecting rod (61) is hinged to the sliding block (9), and the other end of the connecting rod is hinged to the sliding ring (62).
2. A precision turning apparatus for optical elements according to claim 1, wherein: adjustable cooling body includes fixed spring (131), be equipped with the polygon opening that the spring groove reaches and be linked together with the spring groove on slider (9), fixed spring (131) are located the spring inslot, sliding connection has polygon post (132) in the polygon opening, and fixed connection between polygon post (132) and fixed spring (131), one end fixedly connected with blade (133) of rolling disc (4) are kept away from in polygon post (132).
3. A precision turning apparatus for optical elements according to claim 1, wherein: a plurality of heat dissipation holes are uniformly formed in the surface of the rotating disc (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110427542.7A CN113182535B (en) | 2021-04-21 | 2021-04-21 | Precision turning equipment for optical element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110427542.7A CN113182535B (en) | 2021-04-21 | 2021-04-21 | Precision turning equipment for optical element |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113182535A CN113182535A (en) | 2021-07-30 |
| CN113182535B true CN113182535B (en) | 2023-04-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110427542.7A Active CN113182535B (en) | 2021-04-21 | 2021-04-21 | Precision turning equipment for optical element |
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| CN (1) | CN113182535B (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10286791A (en) * | 1997-04-14 | 1998-10-27 | Orc Mfg Co Ltd | Drop of work preventing mechanism and method thereof |
| CN206632394U (en) * | 2017-04-05 | 2017-11-14 | 长春市力众模具制造有限公司 | A kind of workpiece rounding fast clamp positioner |
| CN206916206U (en) * | 2017-07-15 | 2018-01-23 | 青岛环球石墨制品有限公司 | A kind of graphite fixture |
| CN109500409A (en) * | 2018-12-05 | 2019-03-22 | 南通科技职业学院 | A kind of multistage manufacturing processes automatic lathe of middle-size and small-size workpiece |
| CN210173601U (en) * | 2019-07-12 | 2020-03-24 | 郭婷婷 | Grabbing device for taking rubber workpieces |
| CN211490585U (en) * | 2019-10-30 | 2020-09-15 | 惠州市腾达科技有限公司 | CNC hardware processing lathe is with quick positioning fixture |
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| CN113182535A (en) | 2021-07-30 |
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Effective date of registration: 20240426 Address after: 230000 floor 1, building 2, phase I, e-commerce Park, Jinggang Road, Shushan Economic Development Zone, Hefei City, Anhui Province Patentee after: Dragon totem Technology (Hefei) Co.,Ltd. Country or region after: China Address before: No.1, Yangshan North Road, Qixia District, Nanjing City, Jiangsu Province Patentee before: Nanjing Vocational University of Industry Technology Country or region before: China |