减速机型号表示方法:
二级：
DBY160, DBY180, DBY200, DBY224, DBY250, DBY280, DBY315, DBY355, DBY400,
DBY450, DBY500, DBY560;
三级：
DCY160, DCY180, DCY200, DCY224, DCY250, DCY280, DCY315, DCY355, DCY400,
DCY450, DCY500, DCY560, DCY630, DCY710, DCY800;
四级：
DFY160, DFY180, DFY200, DFY225, DFY250, DFY280, DFY320, DFY360, DFY400, DFY450, DFY500, DFY560, DFY630, DFY710