Automatic hot galvanizing technique for steel fastener

Abstract

The invention discloses an automatic pot galvanizing technique of a steel fastener which orderly includes the working procedures like caustic washing, acid washing, water washing, assistant plating, drying, crating, galvanizing, centrifugal zinc throwing, water cooling, passivating, drying, packaging, and the like. The galvanizing temperature is between 450 and 480 DEG C; the working procedures of galvanizing and centrifugal zinc throwing are automatically controlled; the centrifugal zinc throwing is to hoist a galvanized workpiece out of a galvanized surface with a galvanizing material basket and lead the galvanized workpiece to horizontally rotate with the galvanizing material basket to make centrifugal movement. The technique leads the galvanized workpiece to instantly carry out zinc throwing without pouring the basket; the temperature drop of the workpiece is small; the galvanizing temperature can be reduced below 480 DEG C; energy is saved; the coherence for the intensity, the precision and the quality of the fastener is ensured; the service life of a zinc boiler is prolonged; the production cost is reduced; the processes for galvanizing and zinc throwing are automatic, safe and effective; besides, the working intensity is low. The technique provided by the invention can be used for carrying out pot galvanizing on the steel fasteners like bolts, nuts, nails, and the like.

Description

technical field

[0001] The invention relates to a metal component surface treatment process, in particular to an automatic hot-dip galvanizing process for steel fasteners. Background technique

[0002] The hot-dip galvanizing technology is widely used in the surface anticorrosion of steel components. The bonding force between the coating and the bad material is strong, and the coating has a cathodic protection effect on the steel, which can prolong the service life of the components. At present, the hot-dip galvanizing process of bolts, nuts, nails and other steel fasteners includes alkali cleaning→acid cleaning→water washing→plating help→drying→basket loading→galvanizing in the galvanizing pot→lifting the galvanizing pot→workpieces from the galvanizing basket Pour into the centrifuge to dump zinc→water cooling→passivation→drying→packing and other steps. Among them, there are the following disadvantages in the link of galvanizing into the zinc pot→taking out the zinc pot→pou...

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