CN113644532B - Self-cooling nitric oxide gas laser and application method thereof - Google Patents
Self-cooling nitric oxide gas laser and application method thereof Download PDFInfo
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- CN113644532B CN113644532B CN202110877379.4A CN202110877379A CN113644532B CN 113644532 B CN113644532 B CN 113644532B CN 202110877379 A CN202110877379 A CN 202110877379A CN 113644532 B CN113644532 B CN 113644532B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/02—Constructional details
- H01S3/04—Arrangements for thermal management
- H01S3/041—Arrangements for thermal management for gas lasers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/02—Constructional details
- H01S3/04—Arrangements for thermal management
- H01S3/0404—Air- or gas cooling, e.g. by dry nitrogen
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/02—Constructional details
- H01S3/04—Arrangements for thermal management
- H01S3/0407—Liquid cooling, e.g. by water
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- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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Abstract
The invention discloses a self-cooling nitric oxide gas laser and a use method thereof, and relates to the technical field of self-cooling devices of lasers. This self-cooling formula nitric oxide gas laser, including laser emitter, laser emitter's outer wall swing joint has hydrologic cycle mechanism, hydrologic cycle mechanism's inner wall swing joint has the air current cooling mechanism, the outer wall of air current cooling mechanism is through the hydrologic cycle mechanism and the outer wall swing joint of laser emitter that set up, hydrodynamic force conversion mechanism has evenly been seted up to the outer wall of air current cooling mechanism, hydrodynamic force conversion mechanism's inner wall is through the inner wall swing joint of air current cooling mechanism and hydrologic cycle mechanism that sets up. According to the self-cooling nitric oxide gas laser and the application method thereof, the water circulation mechanism can continuously cool the laser through water circulation, and damage caused by overhigh temperature of the laser is reduced.
Description
Technical Field
The invention relates to the technical field of self-cooling devices of lasers, in particular to a self-cooling nitric oxide gas laser and a use method thereof.
Background
The main heating element of laser marking machine is the laser head, when the operation of laser marking machine, the laser head can produce certain heat, if handle inadequately, be heated and take place certain deformation, lead to the laser head ageing, if process this moment, can seriously influence machining precision, and reduce device life, light-emitting quality subalternation problem, so need cooling system in time cool down it, distribute away heat, keep it at certain cooling temperature simultaneously, guarantee the light-emitting quality of laser head, consequently, need cool off when cutting, current cooling mode adopts jet air flow setting, and jet air flow setting is inside the laser beam pipeline, the heat distributes slowly, and can influence the intensity of laser, inconvenient use.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a self-cooling nitric oxide gas laser and a use method thereof, the laser is cooled in a water circulation and air cooling mode, the loss is reduced while the cooling performance is improved, and the self-cooling nitric oxide gas laser is convenient to use.
In order to achieve the above purpose, the invention is realized by the following technical scheme: the utility model provides a self-cooling formula nitric oxide gas laser, includes laser emitter, laser emitter's outer wall swing joint has hydrologic cycle mechanism, hydrologic cycle mechanism's outer wall swing joint has air current cooling mechanism, air current cooling mechanism's inner wall is through the hydrologic cycle mechanism and laser emitter's outer wall swing joint that set up, hydrodynamic force conversion mechanism has evenly been seted up to air current cooling mechanism's outer wall, hydrodynamic force conversion mechanism's inner wall is through the inner wall swing joint of air current cooling mechanism and hydrologic cycle mechanism that sets up.
Preferably, the structure of the water circulation mechanism comprises a first fixed block and water circulation holes, wherein the water circulation holes are uniformly formed in the first fixed block.
Preferably, the structure of the hydrodynamic force conversion mechanism comprises a water inlet groove, a water flow hole and a pressure water groove, the water inlet groove is arranged at the bottom end of the airflow heat dissipation mechanism, the pressure water groove is uniformly formed in the airflow heat dissipation mechanism, the water flow hole is uniformly formed in the outer wall of the pressure water groove, and the inner wall of the water inlet groove is communicated with the inner wall of the pressure water groove through the water flow hole.
Preferably, the position of the inner wall of the pressure water tank, which is close to the center, is provided with a fixed water through pipe, the position of the inner wall of the fixed water through pipe, which is close to the center, is provided with a first rotating shaft, the outer wall of the first rotating shaft is fixedly connected with a fan blade, the inner wall of the pressure water tank is fixedly connected with a sealing shaft, and the inner wall of the sealing shaft is movably connected with the outer wall of the fan blade.
Preferably, the structure of air current heat dissipation mechanism includes second fixed block, fixed bolster and mechanism of blowing, the ventilation recess has evenly been seted up to the outer wall of second fixed block, the inner wall of ventilation recess is close to the position fixedly connected with fixed bolster in center, the inner wall swing joint of fixed bolster has the mechanism of blowing, the outer wall of mechanism of blowing passes through the fixed bolster and the inner wall swing joint of ventilation recess that set up.
Preferably, the structure of mechanism of blowing includes second axis of rotation, bellows, fixed card axle, third axis of rotation and fan, the outer wall of second axis of rotation is through the outer wall swing joint of sealed axle and the first axis of rotation that sets up, one side that the first axis of rotation was kept away from to the outer wall of second axis of rotation is provided with the bellows, one side fixedly connected with fixed card axle is kept away from to the outer wall of bellows, the outer wall of fixed card axle is through the outer wall swing joint of bellows and second axis of rotation that sets up, one side fixedly connected with third axis of rotation is kept away from to the outer wall of fixed card axle, the outer wall of third axis of rotation is kept away from the outer wall swing joint of fixed card axle through the fixed card axle that sets up and bellows, one side fixedly connected with fan is kept away from to the outer wall of fan, the outer wall of fan is through the outer wall fixedly connected with of third axis of rotation and fixed card axle that sets up.
The self-cooling nitric oxide gas laser comprises the following using method:
s1: the water circulation mechanism and the airflow heat dissipation mechanism are arranged on the outer wall of the laser transmitter, the water inlet hole is connected with the water pump, the water outlet hole is connected with the water inlet end of the water pump to form circulation cooling, and the resource loss is reduced;
s2: the heat generated by the operation of the laser transmitter is conducted to the first fixed block from the laser transmitter, and then is conducted to the second fixed block through the first fixed block, so that heat transfer is formed to cool the laser transmitter;
s3: the water pump drives a water source to enter the water inlet tank from the water inlet hole and then enter the pressure water tank from the water flow hole, so that the second fixed block is cooled;
s4: in the water flowing process, the fan blades are driven to rotate, so that the fan rotates to drive the air flow to cool the outer wall and the inner wall of the second fixed block;
s5: the inner wall of rivers through fixed water pipe flows into the inner wall of water circulation hole, cools down first fixed block, increases the cooling effect of device.
The invention provides a self-cooling nitric oxide gas laser and a use method thereof. The beneficial effects are as follows:
(1) According to the self-cooling nitric oxide gas laser and the application method thereof, through the water circulation mechanism, the laser can be continuously cooled through water circulation, and damage caused by overhigh temperature of the laser is reduced.
(2) According to the self-cooling nitric oxide gas laser and the application method thereof, the temperature of the laser can be led out through the cooperation of the first fixing block and the second fixing block, the radiating efficiency is improved, and the self-cooling nitric oxide gas laser is convenient to use.
(3) According to the self-cooling nitric oxide gas laser and the application method thereof, through the arranged water circulation holes, the area of cooling the circulating water in the process of cooling the laser by water circulation can be increased, and the practicability of the device is improved.
(4) According to the self-cooling nitric oxide gas laser and the application method thereof, through the ventilation groove, the condition that the temperature reduction effect is slowed down due to the fact that hot air blown out in the temperature reduction process is recycled can be reduced.
(5) According to the self-cooling nitric oxide gas laser and the application method thereof, through the arranged blowing mechanism, the device can flow through circulating water and air flow, so that the automation degree of the device is improved, and the device is convenient to use.
(6) According to the self-cooling nitric oxide gas laser and the application method thereof, through the cooperation of the water circulation mechanism, the hydrodynamic force conversion mechanism and the airflow heat dissipation mechanism, the cooling efficiency of the device to the laser can be greatly improved, and the occurrence of damage to the laser due to overhigh temperature can be reduced as far as possible.
Drawings
FIG. 1 is a schematic illustration of an isometric view of the structure of the present invention;
FIG. 2 is a partial front cross-sectional view of the structure of the present invention;
FIG. 3 is a cross-sectional view of the structure of the present invention;
FIG. 4 is an expanded front cross-sectional view of the water circulation mechanism of the present invention;
fig. 5 is an enlarged schematic view of the structure a in fig. 3 according to the present invention.
In the figure: 1. a laser emitter; 2. a water circulation mechanism; 21. a first fixed block; 22. a water circulation hole; 3. a hydrodynamic force conversion mechanism; 31. a water inlet tank; 32. a water flow hole; 33. a pressure water tank; 34. fixing a water pipe; 35. a first rotation shaft; 36. a fan blade; 37. sealing the shaft; 4. an air flow heat dissipation mechanism; 41. a second fixed block; 42. a fixed bracket; 43. a blowing mechanism; 431. a second rotation shaft; 432. a bellows; 433. fixing the clamping shaft; 434. a third rotation shaft; 435. a fan.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
Examples of the embodiments are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements throughout or elements having like or similar functionality. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
Referring to fig. 1-5, the present invention provides a technical solution: the utility model provides a self-cooling formula nitric oxide gas laser and application method thereof, including laser emitter 1, the outer wall swing joint of laser emitter 1 has hydrologic cycle mechanism 2, the outer wall swing joint of hydrologic cycle mechanism 2 has airflow cooling mechanism 4, the inner wall of airflow cooling mechanism 4 is through the hydrologic cycle mechanism 2 and the outer wall swing joint of laser emitter 1 that set up, hydrodynamic force conversion mechanism 3 has evenly been seted up to the outer wall of airflow cooling mechanism 4, the inner wall of hydrodynamic force conversion mechanism 3 is through the inner wall swing joint of airflow cooling mechanism 4 and hydrologic cycle mechanism 2 that set up, the bottom of airflow cooling mechanism 4 is provided with the inlet opening.
The structure of the water circulation mechanism 2 comprises a first fixed block 21 and water circulation holes 22, wherein the water circulation holes 22 are uniformly formed in the first fixed block 21, and water outlets are formed in the bottom end of the water circulation mechanism 2.
The structure of hydrodynamic force conversion mechanism 3 includes intake groove 31, rivers hole 32 and pressure basin 33, and the bottom of air current cooling mechanism 4 is provided with intake groove 31, and pressure basin 33 has evenly been seted up to the inside of air current cooling mechanism 4, and water flow hole 32 has evenly been seted up to the outer wall of pressure basin 33, and the inner wall of intake groove 31 link up with the inner wall of pressure basin 33 through the water flow hole 32 that sets up, and the inner wall of pressure basin 33 link up with the inner wall of hydrologic cycle hole 22 through the inner wall of the fixed water pipe 34 that sets up.
The inner wall of the pressure water tank 33 is provided with a fixed water through pipe 34 near the center, the inner wall of the fixed water through pipe 34 is provided with a first rotating shaft 35 near the center, the outer wall of the first rotating shaft 35 is fixedly connected with a fan blade 36, the inner wall of the pressure water tank 33 is fixedly connected with a sealing shaft 37, the inner wall of the sealing shaft 37 is movably connected with the outer wall of the fan blade 36, and the inner wall of the first fixed block 21 is communicated with the inner wall of the water inlet tank 31 through the arranged pressure water tank 33.
The structure of air current cooling body 4 includes second fixed block 41, fixed bolster 42 and mechanism 43 of blowing, and the ventilation recess has evenly been seted up to the outer wall of second fixed block 41, and the inner wall of ventilation recess is close to the position fixedly connected with fixed bolster 42 in the center, and the inner wall swing joint of fixed bolster 42 has mechanism 43 of blowing, and the outer wall of mechanism 43 of blowing is through the fixed bolster 42 and the inner wall swing joint of ventilation recess that set up, and second fixed block 41 is high temperature resistant and heat conduction material.
The structure of the blowing mechanism 43 comprises a second rotating shaft 431, a corrugated pipe 432, a fixed clamping shaft 433, a third rotating shaft 434 and a fan 435, wherein the outer wall of the second rotating shaft 431 is movably connected with the outer wall of the first rotating shaft 35 through a set sealing shaft 37, the corrugated pipe 432 is arranged on one side, far away from the first rotating shaft 35, of the outer wall of the second rotating shaft 431, the fixed clamping shaft 433 is fixedly connected with one side, far away from the second rotating shaft 431, of the outer wall of the fixed clamping shaft 433, the third rotating shaft 434 is fixedly connected with one side, far away from the corrugated pipe 432, of the fixed clamping shaft 433, the outer wall of the third rotating shaft 434 is movably connected with the outer wall of the corrugated pipe 432 through a set fixed clamping shaft 433, the fan 435 is fixedly connected with one side, far away from the fixed clamping shaft 433, of the outer wall of the fan 435, of the second rotating shaft 431 and the fixed support 42 are made of non-heat conducting materials.
The self-cooling nitric oxide gas laser comprises the following using method:
s1: the water circulation mechanism 2 and the airflow heat dissipation mechanism 4 are arranged on the outer wall of the laser transmitter 1, the water inlet hole is connected with the water pump, the water outlet hole is connected with the water inlet end of the water pump to form circulation cooling, and the resource loss is reduced;
s2: the heat generated by the operation of the laser transmitter 1 is conducted from the laser transmitter 1 to the first fixed block 21, and then is conducted to the second fixed block 41 through the first fixed block 21, so that heat transfer is formed to cool the laser transmitter 1;
s3: the water pump drives the water source to enter the water inlet groove 31 from the water inlet hole and then enter the pressure water groove 33 from the water flow hole 32, so that the second fixed block 41 is cooled;
s4: during the water flowing process, the fan blades 36 are driven to rotate, so that the fan 435 rotates to drive the air flow to cool the outer wall and the inner wall of the second fixing block 41;
s5: the water flow flows into the inner wall of the water circulation hole 22 through the inner wall of the fixed water through pipe 34 to cool the first fixed block 21, and the cooling effect of the device is increased.
When the device is used, the device of the air flow heat dissipation mechanism 4 of the water circulation mechanism 2 is arranged on the outer wall of the laser emitter 1, the water inlet hole is connected with the water pump, the water outlet hole is connected with the water inlet end of the water pump, when the laser emitter 1 operates, the device operates together with the water pump, heat generated by the operation of the laser emitter 1 is conducted from the outer wall of the laser emitter 1 to the inside of the first fixed block 21, then is conducted to the inside of the second fixed block 41 through the outer wall of the first fixed block 21, the laser emitter 1 is cooled through heat transfer, the water pump drives the water source to enter the inside of the water inlet groove 31 from the water inlet hole 32, then enters the inside of the pressure water groove 33, then flows into the inside of the fixed water through pipe 34 from the inside of the pressure water groove 33, the second fixed block 41 is cooled through the inside of the second fixed block 41 in the flowing process, the fan blade 36 is driven to rotate, the fan blade 36 drives the first rotating shaft 35 to rotate in the rotating process, so that the second rotating shaft 431 on the inner wall of the sealing shaft 37 rotates, the corrugated pipe 432 rotates to drive the fixing clamping shaft 433 to rotate on the inner wall of the fixing support 42, so that the fan 435 on the top end of the third rotating shaft 434 rotates, the fan 435 rotates to drive air flow to enter from one end of the ventilation groove and flow out from the other end, so that the air flow cools the outer wall and the inner wall of the second fixing block 41, meanwhile, the water flow flows into the inner wall of the water circulation hole 22 through the inner wall of the fixing water through pipe 34, cools the first fixing block 21 on the inner wall of the water circulation hole 22, the cooling effect of the device is improved, then the water flow is discharged from the water outlet on the bottom end of the first fixing block 21 to the position of the water source, and the circulating cooling is formed, and the resource loss is reduced.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (3)
1. A self-cooling nitric oxide gas laser, comprising a laser emitter (1), characterized in that: the outer wall of the laser transmitter (1) is movably connected with a water circulation mechanism (2), the outer wall of the water circulation mechanism (2) is movably connected with an air flow heat dissipation mechanism (4), the inner wall of the air flow heat dissipation mechanism (4) is movably connected with the outer wall of the laser transmitter (1) through the arranged water circulation mechanism (2), the outer wall of the air flow heat dissipation mechanism (4) is uniformly provided with a hydrodynamic force conversion mechanism (3), and the inner wall of the hydrodynamic force conversion mechanism (3) is movably connected with the inner wall of the water circulation mechanism (2) through the arranged air flow heat dissipation mechanism (4);
the structure of the water circulation mechanism (2) comprises a first fixed block (21) and a water circulation hole (22), wherein the water circulation hole (22) is uniformly formed in the first fixed block (21);
the structure of the hydrodynamic force conversion mechanism (3) comprises a water inlet groove (31), a water flow hole (32) and a pressure water groove (33), wherein the water inlet groove (31) is arranged at the bottom end of the airflow heat dissipation mechanism (4), the pressure water groove (33) is uniformly arranged in the airflow heat dissipation mechanism (4), the water flow hole (32) is uniformly arranged on the outer wall of the pressure water groove (33), and the inner wall of the water inlet groove (31) is communicated with the inner wall of the pressure water groove (33) through the arranged water flow hole (32);
a fixed water through pipe (34) is arranged at a position, close to the center, of the inner wall of the pressure water tank (33), a first rotating shaft (35) is arranged at a position, close to the center, of the inner wall of the fixed water through pipe (34), a fan blade (36) is fixedly connected to the outer wall of the first rotating shaft (35), a sealing shaft (37) is fixedly connected to the inner wall of the pressure water tank (33), and the inner wall of the sealing shaft (37) is movably connected with the outer wall of the fan blade (36);
the structure of air current cooling mechanism (4) includes second fixed block (41), fixed bolster (42) and mechanism of blowing (43), the ventilation recess has evenly been seted up to the outer wall of second fixed block (41), the inner wall of ventilation recess is close to the position fixedly connected with fixed bolster (42) in center, the inner wall swing joint of fixed bolster (42) has mechanism of blowing (43), the outer wall of mechanism of blowing (43) is through the fixed bolster (42) and the inner wall swing joint of ventilation recess that set up.
2. A self-cooling nitric oxide gas laser according to claim 1, wherein: the structure of mechanism (43) of blowing includes second axis of rotation (431), bellows (432), fixed card axle (433), third axis of rotation (434) and fan (435), the outer wall of second axis of rotation (431) is through the outer wall swing joint of sealed axle (37) and first axis of rotation (35) that set up, one side that first axis of rotation (35) was kept away from to the outer wall of second axis of rotation (431) is provided with bellows (432), one side fixedly connected with fixed card axle (433) that one side of second axis of rotation (431) was kept away from to the outer wall of bellows (432), the outer wall of fixed card axle (433) is through the outer wall swing joint of bellows (432) and second axis of rotation (431) that set up, one side fixedly connected with third axis of rotation (434) that the outer wall of third axis of rotation (434) was kept away from to the outer wall of fixed card axle (433) is through the outer wall swing joint of fixed card axle (433) and bellows (432), the outer wall of fan (433) is kept away from through the outer wall swing joint of fixed card (433) of fan (433) and fan (434).
3. The application method of the self-cooling nitric oxide gas laser is characterized by comprising the following steps of: comprises the following steps of the method,
s1: the water circulation mechanism (2) and the airflow heat dissipation mechanism (4) are arranged on the outer wall of the laser emitter (1), the water inlet hole is connected with the water pump, the water outlet hole is connected with the water inlet end of the water pump to form circulation cooling, and the resource loss is reduced;
s2: the heat generated by the operation of the laser transmitter (1) is conducted from the laser transmitter (1) to the first fixed block (21), and then is conducted to the second fixed block (41) through the first fixed block (21), so that heat transfer is formed to cool the laser transmitter (1);
s3: the water pump drives a water source to enter the water inlet groove (31) from the water inlet hole, and then enters the pressure water groove (33) from the water flow hole (32), so that the second fixed block (41) is cooled;
s4: in the process of water flowing, the fan blades (36) are driven to rotate, so that the fan (435) rotates to drive the air flow to cool the outer wall and the inner wall of the second fixed block (41);
s5: the water flow flows into the inner wall of the water circulation hole (22) through the inner wall of the fixed water through pipe (34) to cool the first fixed block (21), so that the cooling effect of the device is improved.
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| CN209516297U (en) * | 2018-12-28 | 2019-10-18 | 江苏亮点光电科技有限公司 | A kind of efficient laser heat radiating device special |
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| CN208157846U (en) * | 2018-05-18 | 2018-11-27 | 沧州沃福激光科技有限公司 | A kind of heat radiating device for laser |
| CN210649114U (en) * | 2019-10-11 | 2020-06-02 | 深圳市柯宝原科技有限公司 | Circulation cooling unit for laser cutting machine |
| CN111934168A (en) * | 2020-08-13 | 2020-11-13 | 李�杰 | Prevent condensation laser's circulating water cooling plant |
| CN213401848U (en) * | 2020-12-10 | 2021-06-08 | 上海众之鑫智能化设备有限公司 | Laser transformation cooling device |
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Effective date of registration: 20230413 Address after: Room 202.204, building 3, No. 150, Heyu Road, Jiading District, Shanghai 201800 Applicant after: SHANGHAI QIYUAN GAS DEVELOPMENT Co.,Ltd. Address before: 510000 Building 1, No. 3, Kesheng Road, Guangzhou private science and Technology Park, No. 1633, Beitai Road, Baiyun District, Guangzhou, Guangdong Applicant before: Chen Yanhui |
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