The hot-dip galvanized steel pipe is finished by hot-dip galvanizing process by dialing, pressing, screwing, pulling out and lifting mechanical principle of full-immersion semi-automatic galvanizing.
1, process parameter control: zinc liquid temperature should be controlled between 440-460 ℃; zinc immersion time should be controlled between 30-60 seconds; aluminum content (zinc liquid aluminum content 0.01-0.02%)
2, the use of zinc ingots should be the national standard Zn0-3 zinc ingots.
3, to regularly maintain good control pull pull screw, pull out the lifting device reliability, enhance the lubrication of the cylinder, adjust the height of the galvanized pipe distributor, angle, the device adjusted to the best condition.
4, close to the switch position to be accurate; thermocouple lines and tables to a unified model to use, otherwise, the temperature error, thermocouple protection sleeve, to always check the replacement.
5, the console operator to operate under the equipment and the gesture command, manually adjust the speed to prevent the phenomenon of stuck.
6, the furnace before the use of tools to preheat and then use to prevent splashing zinc injury; often check whether the steel fell into the pot, if necessary to clear out; to timely adjust the equipment do not card to protect the equipment Safety.
7, zinc pot to add zinc, the zinc ingot to warm up, add zinc will never allow a bundle of zinc, zinc up to not more than five each time, should be attached to the vertical zinc pot zinc pot wall Slowly draw down, so as not to damage the zinc pot and spoil a lot of damage Zinc injury; zinc liquid is strictly prohibited fall into the iron-like substances in order to prevent a large number of dross.
8, molten zinc should be heated slowly, not burning anxious fire, otherwise it will damage the life of galvanized pot, and a large number of zinc vapor evaporated. This harmful gas is inhaled by the body too much, will suffer from a "casting workers heat" of the disease. In the zinc melt process, once the zinc has a high temperature must not hand to toggle the zinc block, so as not to burn, should use the appropriate tools to toggle it.
9, to regularly clear the surface of the zinc liquid zinc ash. Scraping ash should be lightly on the surface with zinc scraping scraping gray board scraping wiping, can not stir too much, so as not to raise zinc ash, gray scraping board should not be with the zinc or pipe when the pipe collided in order to avoid rolling Live accidents or equipment accidents.
10, on the ground before the zinc block, broken zinc, galvanized out of the zinc, steel pipe to the outside of the zinc to be recycled back to the pot in order to reduce the heat loss of zinc pot.
11, zinc surface plus aluminum ingot, be sure to move back and forth several times to ensure uniform aluminum surface zinc content.
12, in order to facilitate slag and zinc pumping, zinc pot to be placed inside 20 tons of lead.
13, when the slag scraper to catch the first preheating, dross to block the size of storage, waterlogging slag temperature should be controlled at 455 ℃ or more, swing grasping slag machine must use special tools, 1 meter away from the zinc pot, Feet to stand into a T-shaped.
14, hot-dip galvanizing process more stringent requirements, so in the production process of hot-dip galvanizing, be sure to dry foot position, which means that the number of roots per unit time or tonnage more, the lower the cost, the higher the contrary.
