The Research Of Small Steel Workpieces Hot Galvanizing Process And The Design Of The Automatic Production Line

The galvanizing of small steel workpieces,which include fasteners,steel parts,malleable cast iron pieces,electric power fittings and complex parts,is an important part of hot dipping industry.Due to its high process temperature,serious pollution,and high labor intensity of workers,new energy-saving technology and efficient equipments is required with the progress of the society.First of all,through the field test,a preliminary understanding and experimental parameters of the process for the production of hot galvanizing on small steel workpieces was obtained.At present,the dipping temperature of small steel workpieces is higher than the traditional hot galvanizing which is better for favorable coating.Through the study of galvanized and centrifugal process,process parameters for small pieces of hot dipping at 450? were obtained.Secondly,according to the technological parameters,the rotating zinc plating device,pretreatment device and post-processing device were designed.The rotary galvanized machine simplified the galvanizing and centrifugal process,which achieved the integration of zinc and centrifugal.Liquid zinc after centrifugation dropped into the zinc pot directly,which reduced the heat loss and ash.So the production efficiency increased with the ring zinc pot.Then small steel workpieces can be hot dipped with the traditional process parameters at 450?.The pretreatment device was designed with six angle roller and gantry walking trolley structure,which had higher pretreatment efficiency.The unfavorable coating quality,which was caused during impaction during hot dipping was inhibited in the post-treatment.Finally a hot dipping production line,which was high degree of automotive,more energy saving and high efficiency,for the small steel pieces was established with the 36 ~ 72 tons output which was 1.89~3.79 times to the traditional line.Finally,based on the highest production in the production line of 72 tons,the building of planning was designed.The analysis of the economic benefits showed that: the total investment was 4,270,000 yuan,of which the production line was 3,000,000 yuan.The annual output value was 28,350,000 yuan.The annual profit was 2,925,000 yuan.The cost-recovering time was about 2.5 years.So the hot galvanizing line for small steel workpieces had positive market competitiveness.