The muffler of ordinary syringe assembly machine can not be assembled automatically, and it still depends on manual assembly temporarily, which can not meet the market demand. It is urgent to develop an automatic assembly line of safe self destruct syringe to realize large-scale production. The design of new high efficiency screw rotor profile, tool design, machining, testing, screw compressor performance test (including thermodynamic calculation, dynamics calculation, end profile calculation, geometric eigenvalue calculation, cutter edge calculation, working process simulation, rotor force analysis, rotor deformation calculation, etc. )。 Germany and other countries have begun to widely use this technology, but China has just started, the reliability and stability are far behind foreign countries. According to the requirements of "emission reduction and consumption reduction", the market demand is great. The plate radiator is a new type of second generation radiator. In order to meet the export demand, it is necessary to invest equipment, improve production process and introduce operators. The automatic production line and special equipment for manufacturing and maintenance of urban rail transit vehicles, such as car body welding production line and frame machine, are used to replace imported products.