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Property and equipment, net (Tables) | 12 Months Ended
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Dec. 31, 2023
Property, Plant and Equipment [Abstract] |
Schedule of property and equipment, net |
Schedule of property and equipment, net |  |  |  |  |  |  |  |  |  |  |  |
|  | December 31, 2022 |  |  | December 31, 2023 |  |  | December 31, 2023 |
|  | RMB |  |  | RMB |  |  | USD |
Office equipment |  |  | 1,140,456 |  |  |  | 1,005,558 |  |  |  | 141,974 |
Mechanical equipment |  |  | 1,059,178 |  |  |  | 1,059,178 |  |  |  | 149,544 |
Electronic and other equipment |  |  | 2,454,537 |  |  |  | 3,167,783 |  |  |  | 447,256 |
Vehicles |  |  | 43,982 |  |  |  | 43,982 |  |  |  | 6,210 |
Subtotal |  |  | 4,698,153 |  |  |  | 5,276,501 |  |  |  | 744,984 |
Less: accumulated depreciation |  |  | (3,050,277 | ) |  |  | (3,678,367 | ) |  |  | (519,345 | )
Total |  |  | 1,647,876 |  |  |  | 1,598,134 |  |  |  | 225,639 |
Depreciation expense for the years ended December 31, 2021, 2022 and 2023 amounted to RMB 294,514, RMB 464,999 and RMB 807,722 (USD 114,624), respectively.

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 10 -Topic 360 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482099/360-10-50-1 + Details
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