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v3.24.1

Summary of significant accounting policies (Tables) | 12 Months Ended
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Dec. 31, 2023
Accounting Policies [Abstract] |
Schedule of estimated useful lives |
Schedule of estimated useful lives |  |
|  | Useful Life
Office equipment |  | 3 years
Mechanical equipment |  | 3 – 5 years
Electronic equipment |  | 3 – 5 years
Schedule of noncontrolling interests |
Schedule of noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |
|  | December 31, 2022 |  |  | December 31, 2023 |  |  | December 31, 2023 |
|  | RMB |  |  | RMB |  |  | USD |
Ocean HK |  |  | 291,921 |  |  |  | 86,196 |  |  |  | 14,187 |
Total non-controlling interests |  |  | 291,921 |  |  |  | 86,196 |  |  |  | 14,187 |

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