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Property and equipment, net (Tables)
 12 Months Ended
Dec. 31, 2023
Property, Plant and Equipment [Abstract]  
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.