CN114294204B - Multi-phase electric air bag pump - Google Patents
Multi-phase electric air bag pump Download PDFInfo
- Publication number
- CN114294204B CN114294204B CN202111637673.4A CN202111637673A CN114294204B CN 114294204 B CN114294204 B CN 114294204B CN 202111637673 A CN202111637673 A CN 202111637673A CN 114294204 B CN114294204 B CN 114294204B
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- Prior art keywords
- liquid
- linkage
- air bag
- corrugated pipes
- pump
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- 239000007788 liquid Substances 0.000 claims abstract description 162
- 230000007246 mechanism Effects 0.000 claims abstract description 28
- -1 polytetrafluoroethylene Polymers 0.000 claims description 5
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 5
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 5
- 238000005086 pumping Methods 0.000 abstract description 5
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 4
- 235000017491 Bambusa tulda Nutrition 0.000 description 4
- 241001330002 Bambuseae Species 0.000 description 4
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 4
- 239000011425 bamboo Substances 0.000 description 4
- 238000007906 compression Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Landscapes
- Reciprocating Pumps (AREA)
Abstract
The invention discloses a multiphase electric air bag pump which comprises a pump body, a driving mechanism and a plurality of liquid conveying mechanisms, wherein each liquid conveying mechanism is connected with the pump body; the pump body is provided with a liquid inlet and a liquid outlet, the liquid feeding mechanism comprises corrugated pipes, the corrugated pipes are fixedly connected with the pump body, each corrugated pipe is internally provided with a liquid inlet valve and a liquid outlet valve, the liquid inlet valves are communicated with the liquid inlet through liquid inlet channels, and the liquid outlet valves are communicated with the liquid outlet through liquid outlet channels; the driving mechanism is used for driving the corrugated pipes to stretch or compress so as to adjust the volume in the corrugated pipes, and at least two corrugated pipes have different volumes at the same time. The multiphase electric air bag pump provided by the invention reduces the occurrence of the phenomenon of intermittent pumping liquid of the air bag, thereby realizing continuous liquid feeding, improving the smoothness and stability of liquid feeding and facilitating the utilization of the liquid to be conveyed by liquid equipment.
Description
Technical Field
The application relates to the field of air bag pumps, in particular to a multiphase electric air bag pump.
Background
The semiconductor industry and the electronic industry require strongly corrosive liquid delivery pumps such as acid and alkali. An air bag pump is a pump which uses a bag object with variable volume to alternately increase and decrease working volume in a pump cylinder to convey special liquid.
The existing air bag pump is driven by air, the air bag is pulled back and forth to realize liquid delivery, and liquid delivery is realized in the air bag compression process, but liquid delivery cannot be realized when the air bag is in a recovery and stretching state, so that the existing air bag pump has intermittent liquid delivery and cannot continuously deliver liquid.
Disclosure of Invention
In order to facilitate continuous liquid discharge of the air bag pump, the application provides a multiphase electric air bag pump.
The application provides a multiphase electric air bag pump adopts following technical scheme:
the multiphase electric air bag pump comprises a pump body, a driving mechanism and a plurality of liquid conveying mechanisms, wherein each liquid conveying mechanism is connected with the pump body;
the pump body is provided with a liquid inlet and a liquid outlet, the liquid feeding mechanism comprises corrugated pipes, the corrugated pipes are fixedly connected with the pump body, each corrugated pipe is internally provided with a liquid inlet valve and a liquid outlet valve, the liquid inlet valves are communicated with the liquid inlet through liquid inlet channels, and the liquid outlet valves are communicated with the liquid outlet through liquid outlet channels;
the driving mechanism is used for driving the corrugated pipes to stretch or compress so as to adjust the volume in the corrugated pipes, and at least two corrugated pipes have different volumes at the same time.
Through adopting above-mentioned technical scheme, actuating mechanism drives bellows and stretches or compress, when the bellows is stretched, the feed liquor valve is opened, the drain valve is closed, liquid enters into the bellows through inlet, feed liquor passageway and feed liquor valve, when the bellows is compressed, the drain valve is opened, the feed liquor valve is closed, liquid flows out through outlet valve, drain liquor passageway and liquid outlet, owing to have the volume difference in two at least bellows in the same time, thereby the emergence of wind bag pumping liquid intermittent phenomenon has been reduced, thereby realize continuous liquid feeding, the smoothness and the stability of liquid feeding have been improved, the liquid of being convenient for use liquid equipment to carry is utilized.
Optionally, the driving mechanism comprises a driving component and a linkage component, wherein the linkage component is connected with the corrugated pipe, and the linkage component drives the corrugated pipe to stretch or compress.
Through adopting above-mentioned technical scheme, initiative subassembly drives through the linkage subassembly and drives every bellows compression or tensile simultaneously to improve liquid feed efficiency.
Optionally, each bellows all is connected with the arm-tie, every arm-tie sliding connection has a fixed section of thick bamboo, the bellows is located a fixed section of thick bamboo, a fixed section of thick bamboo is connected with the pump body, the linkage subassembly is connected with the arm-tie.
Through adopting above-mentioned technical scheme, fixed section of thick bamboo is fixed the bellows, and the arm-tie is convenient for compress and tensile the bellows to the stability of bellows motion has been improved.
Optionally, the linkage subassembly includes intermediate gear and linkage gear, the linkage gear has a plurality ofly, every the linkage gear all meshes with the intermediate gear, every the linkage gear all rotates and is connected with the gangbar, every the one end that the linkage gear was kept away from to the gangbar rotates with the arm-tie respectively to be connected, initiative subassembly is connected with the intermediate gear.
Through adopting above-mentioned technical scheme, initiative subassembly drives the intermediate gear and rotates, and the intermediate gear drives the linkage gear and rotates, and linkage gear pivoted in-process drives the reciprocating motion of gangbar, and the gangbar drives arm-tie reciprocating motion to realize continuous liquid feed, improved the stability and the smoothness of liquid feed.
Alternatively, the number of each bellows is set to X, and the angle between the adjacent two of the links is set to Y, the number of bellows and the angle between the adjacent two of the links having a value within a range specified by the following equation, y=360++x.
By adopting the technical scheme, the continuity of liquid feeding is improved.
Optionally, the number X of the bellows is an even number.
By adopting the technical scheme, when the volume in one corrugated pipe is maximum, the volume in the opposite corrugated pipe is minimum, and the liquid outlet of the two opposite corrugated pipes are mutually complemented, so that the continuity of liquid feeding is realized.
Optionally, the distances between every two adjacent linkage gears are equal.
Through adopting above-mentioned technical scheme, the equidistant distribution of linkage gear makes intermediate gear atress even, has improved the continuity of sending liquid simultaneously.
Optionally, the driving component comprises a motor, an output shaft of the motor is coaxially and fixedly connected with a driving gear, and the driving gear is meshed with the intermediate gear.
Through adopting above-mentioned technical scheme, the motor drives the driving gear and rotates, rotates along with driving gear engaged intermediate gear, and intermediate gear drives the linkage gear and rotates, and the linkage gear passes through the gangbar and the arm-tie drives the bellows and stretches out and draws back to accomplish the liquid that send.
Optionally, the liquid inlet valve and the liquid outlet valve are both check valves.
By adopting the technical scheme, the liquid backflow phenomenon is avoided.
Optionally, the pump body and the part of the corrugated pipe, which is contacted with the liquid, are made of polytetrafluoroethylene.
By adopting the technical scheme, the polytetrafluoroethylene is corrosion-resistant, and the service life of the equipment is prolonged.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the plurality of corrugated pipes are arranged, the motor is started, the motor drives the driving gear to rotate, the intermediate gear meshed with the driving gear rotates along with the driving gear, the intermediate gear drives the linkage gear to rotate, the linkage gear drives the corrugated pipes to stretch or compress through the linkage rod and the pulling plate, when the corrugated pipes are stretched, the liquid inlet valve is opened, the liquid outlet valve is closed, liquid enters the corrugated pipes through the liquid inlet, the liquid inlet channel and the liquid inlet valve, when the corrugated pipes are compressed, the liquid outlet valve is opened, the liquid flows out through the liquid outlet valve, the liquid outlet channel and the liquid outlet, and because the volumes in all the corrugated pipes are different, the occurrence of intermittent phenomenon of pumping liquid of the air bags is reduced, the continuous liquid feeding is realized, the fluency and the stability of liquid feeding are improved, and the liquid using equipment is convenient to use the conveyed liquid;
according to the invention, the number of the corrugated pipes and the angle between the two adjacent linkage rods are within the range specified by the following formula (1), Y=360/X, when the number of the corrugated pipes is 6, the angle between the two adjacent linkage rods is 60 degrees, when the volume in one corrugated pipe is maximum, the volume in the opposite corrugated pipe is minimum, and the liquid outlets of the two opposite corrugated pipes are mutually complemented, so that the continuity of liquid feeding is realized. The linkage gears are distributed equidistantly, so that the intermediate gears are uniformly stressed, and meanwhile, the continuity of liquid feeding is improved.
Drawings
FIG. 1 is a schematic diagram of a multiphase electric air bag pump according to the present invention;
fig. 2 is an enlarged view of a portion a in fig. 1.
In the figure: 1. a pump body; 2. a driving mechanism; 21. an active component; 211. a motor; 212. a drive gear; 22. a linkage assembly; 221. an intermediate gear; 222. a linkage gear; 223. a linkage rod; 3. a liquid feeding mechanism; 31. a bellows; 32. a liquid inlet valve; 33. a liquid outlet valve; 34. a liquid inlet channel; 35. a liquid outlet channel; 36. pulling a plate; 37. a fixed cylinder; 4. a liquid inlet; 5. and a liquid outlet.
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. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1 and 2, an embodiment of a multiphase electric air bag pump provided by the invention comprises a pump body 1, a driving mechanism 2 and liquid feeding mechanisms 3, wherein a plurality of liquid feeding mechanisms 3 are arranged, and each liquid feeding mechanism 3 is connected with the pump body 1.
The pump body 1 is provided with a liquid inlet 4 and a liquid outlet 5. The liquid feeding mechanism 3 comprises corrugated pipes 31, the corrugated pipes 31 are fixedly connected with the pump body 1, liquid inlet valves 32 and liquid outlet valves 33 are arranged in each corrugated pipe 31, the liquid inlet valves 32 are communicated with the liquid inlet 4 through liquid inlet channels 34, the liquid outlet valves 33 are communicated with the liquid outlet 5 through liquid outlet channels 35, and the liquid inlet valves 32 and the liquid outlet valves 33 are all check valves, so that liquid backflow phenomenon is avoided. The pump body 1 and the bellows 31 are made of polytetrafluoroethylene at the portion in contact with the liquid. And the polytetrafluoroethylene is corrosion-resistant, so that the service life of the equipment is prolonged.
The driving mechanism 2 is used for driving the bellows 31 to stretch or compress so as to adjust the volume in the bellows 31, and the bellows 31 has six bellows, and the volumes of each bellows 31 are different at the same time.
The driving mechanism 2 drives the corrugated tube 31 to stretch or compress, when the corrugated tube 31 is stretched, the liquid inlet valve 32 is opened, the liquid outlet valve 33 is closed, and liquid enters the corrugated tube 31 through the liquid inlet 4, the liquid inlet channel 34 and the liquid inlet valve 32. When the bellows 31 are compressed, the liquid outlet valve 33 is opened, the liquid inlet valve 32 is closed, and liquid flows out through the liquid outlet valve 33, the liquid outlet channel 35 and the liquid outlet 5, and the volumes in at least two bellows 31 are different at the same time, so that the occurrence of the phenomenon of intermittent pumping of the air bag is reduced, continuous liquid feeding is realized, the liquid feeding smoothness and stability are improved, and the liquid feeding device is convenient to use the conveyed liquid.
The driving mechanism 2 comprises a driving component 21 and a linkage component 22, the linkage component 22 is connected with the corrugated pipe 31, and the linkage component 22 drives the corrugated pipe 31 to stretch or compress. The driving component 21 drives each corrugated pipe 31 to compress or stretch through the linkage component 22, so that the liquid feeding efficiency is improved.
Each bellows 31 is connected with a pull plate 36, each pull plate 36 is connected with a fixed cylinder 37 in a sliding manner, the bellows 31 is positioned in the fixed cylinders 37, the fixed cylinders 37 are connected with the pump body 1, and the linkage assembly 22 is connected with the pull plates 36. The fixing cylinder 37 fixes the corrugated tube 31, and the pulling plate 36 is convenient for compressing and stretching the corrugated tube 31, so that the stability of the movement of the corrugated tube 31 is improved.
The linkage assembly 22 comprises a plurality of intermediate gears 221 and linkage gears 222, each linkage gear 222 is meshed with the intermediate gears 221, each linkage gear 222 is rotationally connected with a linkage rod 223, one end, away from the linkage gear 222, of each linkage rod 223 is rotationally connected with the pulling plate 36, and the driving assembly 21 is connected with the intermediate gears 221. The driving component 21 drives the intermediate gear 221 to rotate, the intermediate gear 221 drives the linkage gear 222 to rotate, the linkage gear 222 drives the linkage rod 223 to reciprocate in the rotating process, and the linkage rod 223 drives the pull plate 36 to reciprocate, so that continuous liquid feeding is realized, and the stability and fluency of liquid feeding are improved.
The number of bellows 31 and the angle between the adjacent two link rods 223 are set to X, and y=360++x, which is within a range defined by the following equation (1), respectively. When the number of the bellows 31 is 6, the angle between the two adjacent linkage rods 223 is 60 degrees, and when the volume in one bellows 31 is the largest, the volume in the opposite bellows 31 is the smallest, and the liquid outlet of the two opposite bellows 31 is mutually complemented, so that the continuity of liquid feeding is realized. The distance between every two adjacent linkage gears 222 is equal, the linkage gears 222 are equidistantly distributed, so that the stress of the intermediate gear 221 is uniform, and the continuity of liquid feeding is improved.
The driving assembly 21 comprises a motor 211, an output shaft of the motor 211 is coaxially and fixedly connected with a driving gear 212, and the driving gear 212 is meshed with an intermediate gear 221. The motor 211 drives the driving gear 212 to rotate, the intermediate gear 221 meshed with the driving gear 212 rotates along with the driving gear, the intermediate gear 221 drives the linkage gear 222 to rotate, and the linkage gear 222 drives the bellows 31 to stretch and retract through the linkage rod 223 and the pull plate 36, so that liquid feeding is completed.
Working principle:
the motor 211 is started, the motor 211 drives the driving gear 212 to rotate, the middle gear 221 meshed with the driving gear 212 rotates along with the driving gear, the middle gear 221 drives the linkage gear 222 to rotate, the linkage gear 222 drives the corrugated pipe 31 to stretch or compress through the linkage rod 223 and the pulling plate 36, when the corrugated pipe 31 is stretched, the liquid inlet valve 32 is opened, the liquid outlet valve 33 is closed, liquid enters the corrugated pipe 31 through the liquid inlet 4, the liquid inlet channel 34 and the liquid inlet valve 32, when the corrugated pipe 31 is compressed, the liquid outlet valve 33 is opened, the liquid inlet valve 32 is closed, and liquid flows out through the liquid outlet valve 33, the liquid outlet channel 35 and the liquid outlet 5, and the volume in all the corrugated pipes 31 is different, so that the occurrence of the phenomenon of intermittent pumping liquid of the air bags is reduced, continuous liquid feeding is realized, the smoothness and the stability of liquid feeding are improved, and the liquid using equipment is convenient to use the conveyed liquid.
The number of bellows 31 and the angle between the adjacent two link rods 223 are within a range defined by the following equation (1), y=360++x. When the number of the bellows 31 is 6, the angle between the two adjacent linkage rods 223 is 60 degrees, and when the volume in one bellows 31 is the largest, the volume in the opposite bellows 31 is the smallest, and the liquid outlet of the two opposite bellows 31 is mutually complemented, so that the continuity of liquid feeding is realized. The linkage gears 222 are equidistantly distributed, so that the intermediate gear 221 is uniformly stressed, and meanwhile, the continuity of liquid feeding is improved.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (8)
1. The utility model provides a multiphase electronic air bag pump which characterized in that: the device comprises a pump body (1), a driving mechanism (2) and a plurality of liquid conveying mechanisms (3), wherein each liquid conveying mechanism (3) is connected with the pump body (1);
the pump body (1) is provided with a liquid inlet (4) and a liquid outlet (5), the liquid feeding mechanism (3) comprises corrugated pipes (31), the corrugated pipes (31) are fixedly connected with the pump body (1), each corrugated pipe (31) is internally provided with a liquid inlet valve (32) and a liquid outlet valve (33), the liquid inlet valves (32) are communicated with the liquid inlet (4) through liquid inlet channels (34), and the liquid outlet valves (33) are communicated with the liquid outlet (5) through liquid outlet channels (35);
the driving mechanism (2) is used for driving the corrugated pipes (31) to stretch or compress so as to adjust the volume in the corrugated pipes (31), and at least two corrugated pipes (31) have different volumes at the same time;
the driving mechanism (2) comprises a driving component (21) and a linkage component (22), the linkage component (22) is connected with the corrugated pipes (31), the linkage component (22) drives the corrugated pipes (31) to stretch or compress, and each corrugated pipe (31) is connected with a pulling plate (36);
the linkage assembly (22) comprises a plurality of intermediate gears (221) and linkage gears (222), each linkage gear (222) is meshed with each intermediate gear (221), each linkage gear (222) is rotationally connected with a linkage rod (223), one end, away from each linkage gear (222), of each linkage rod (223) is rotationally connected with a pulling plate (36) respectively, and the driving assembly (21) is connected with the intermediate gears (221).
2. A multiphase electric air bag pump as recited in claim 1, wherein: each pulling plate (36) is connected with a fixed cylinder (37) in a sliding mode, the corrugated pipe (31) is located in the fixed cylinder (37), the fixed cylinder (37) is connected with the pump body (1), and the linkage assembly (22) is connected with the pulling plates (36).
3. A multiphase electric air bag pump as recited in claim 1, wherein: the number of bellows (31) and the angle between two adjacent linkage rods (223) are set as X, and Y=360/X is within a range defined by the following formula (1).
4. A multiphase electric air bag pump as recited in claim 3, wherein: the number X of the corrugated pipes (31) is even.
5. A multiphase electric air bag pump as recited in claim 1, wherein: the distance between every two adjacent linkage gears (222) is equal.
6. A multiphase electric air bag pump as recited in claim 1, wherein: the driving assembly (21) comprises a motor (211), an output shaft of the motor (211) is coaxially and fixedly connected with a driving gear (212), and the driving gear (212) is meshed with an intermediate gear (221).
7. A multiphase electric air bag pump as recited in claim 1, wherein: the liquid inlet valve (32) and the liquid outlet valve (33) are one-way valves.
8. A multiphase electric air bag pump as recited in claim 1, wherein: the parts of the pump body (1) and the corrugated pipe (31) which are contacted with the liquid are polytetrafluoroethylene.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111637673.4A CN114294204B (en) | 2021-12-29 | 2021-12-29 | Multi-phase electric air bag pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111637673.4A CN114294204B (en) | 2021-12-29 | 2021-12-29 | Multi-phase electric air bag pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114294204A CN114294204A (en) | 2022-04-08 |
| CN114294204B true CN114294204B (en) | 2024-01-05 |
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ID=80971941
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111637673.4A Active CN114294204B (en) | 2021-12-29 | 2021-12-29 | Multi-phase electric air bag pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114294204B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102325999A (en) * | 2009-02-24 | 2012-01-18 | 日本皮拉工业株式会社 | Bellows pump |
| CN106640581A (en) * | 2016-12-26 | 2017-05-10 | 常州瑞择微电子科技有限公司 | Airbag pump with better sealing performance |
| CN206487612U (en) * | 2016-12-26 | 2017-09-12 | 常州瑞择微电子科技有限公司 | Bellows pump check valve body component |
| CN108468637A (en) * | 2018-02-05 | 2018-08-31 | 浙江启尔机电技术有限公司 | A kind of curtain bellowspump |
| CN108591031A (en) * | 2018-05-31 | 2018-09-28 | 东莞市创点智能卫浴实业有限公司 | A kind of novel water vapor self-priming fluid mixing integral type foam pump and apply its bathroom device |
| CN112302913A (en) * | 2020-10-27 | 2021-02-02 | 浙江大学 | Corrugated pipe pump with embedded LVDT displacement sensor |
| CN113482892A (en) * | 2020-09-27 | 2021-10-08 | 深圳华星恒泰泵阀有限公司 | Diaphragm water pump with controllable displacement |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NO344800B1 (en) * | 2018-08-24 | 2020-05-04 | Well Heart Tech As | Downhole well pump assembly |
-
2021
- 2021-12-29 CN CN202111637673.4A patent/CN114294204B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102325999A (en) * | 2009-02-24 | 2012-01-18 | 日本皮拉工业株式会社 | Bellows pump |
| CN106640581A (en) * | 2016-12-26 | 2017-05-10 | 常州瑞择微电子科技有限公司 | Airbag pump with better sealing performance |
| CN206487612U (en) * | 2016-12-26 | 2017-09-12 | 常州瑞择微电子科技有限公司 | Bellows pump check valve body component |
| CN108468637A (en) * | 2018-02-05 | 2018-08-31 | 浙江启尔机电技术有限公司 | A kind of curtain bellowspump |
| CN108591031A (en) * | 2018-05-31 | 2018-09-28 | 东莞市创点智能卫浴实业有限公司 | A kind of novel water vapor self-priming fluid mixing integral type foam pump and apply its bathroom device |
| CN113482892A (en) * | 2020-09-27 | 2021-10-08 | 深圳华星恒泰泵阀有限公司 | Diaphragm water pump with controllable displacement |
| CN112302913A (en) * | 2020-10-27 | 2021-02-02 | 浙江大学 | Corrugated pipe pump with embedded LVDT displacement sensor |
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| Publication number | Publication date |
|---|---|
| CN114294204A (en) | 2022-04-08 |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20221028 Address after: 170 Zihai Road, Minhang District, Shanghai Applicant after: PURE & CLEAN PROCESS SYSTEMS Co.,Ltd. Applicant after: Shanghai Zhichun Precision Manufacturing Co.,Ltd. Address before: 200000 Room 305, building 1, No. 170, Zihai Road, Minhang District, Shanghai Applicant before: Shanghai Zhichun Precision Manufacturing Co.,Ltd. |
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