No. 16, 2nd Floor, Unit 2, Building 1, Geohome, at the intersection of Yushinan Road, Science Avenue, Zhengzhou High-tech Industrial Development Zone 
Upper bronze plate：
The main shaft is equipped with a bronze plate, located above the middle steel plate, which is a vulnerable part.
Lower bronze plate：
The piston is equipped with a lower bronze plate, located below the middle steel plate, which is a vulnerable part. The material is mostly made of aluminum bronze with high hardness and good mechanical properties, and is processed through a metal mold casting process.
