Steel pipe manufacturing method and coated steel pipe and its device applying phenalkamine epoxy paint after using inner diameter shorting machine

摘要

The present invention relates to a method for manufacturing a steel pipe to which phenalkamine epoxy paint is applied after using an inner diameter short machine, a coated steel pipe and an apparatus therefor, and more particularly, to an inner diameter coating after shorting the inner and outer diameters, coating the outer diameter with an epoxy paint, and cooling After blocking both sides of the steel pipe in the process of performing shot blasting with a shot machine once more for the previously corroded inner diameter, shot blasting and coating the shot balls strongly, safely and quickly; It is a polyamine-curable type 2 epoxy paint with a curing agent containing phenalkamine applied. It does not freeze even when coated at low temperatures, has strong adhesion, does not cause condensation, and is a quick-drying type that maintains strong bonding properties. It relates to a method for manufacturing a steel pipe to which phenalkamine epoxy paint is applied, a coated steel pipe, and an apparatus therefor. According to the present invention, the steel pipe is put into the inclined mounting table of the inner and outer diameter shot machine by the conveying means, and the outer surface shot part having the outer surface spray part at the end in order to shot blast the outer surface of the steel pipe and the inner surface of the steel pipe is short braised. an inner and outer shot blasting step of injecting a shot ball into the inner and outer surfaces of the steel pipe by entering an inner shot part having an inner surface spraying part at the end in the longitudinal direction of the steel pipe by a moving unit for stinging; preheating to 350 ~ 380 ℃ by putting the inner and outer surface shot blasting finished steel pipe by the inner and outer diameter shot machine into a preheating furnace; mounting caps for rotating the steel pipe to both ends of the preheated steel pipe; While being mounted on the cap for rotating the steel pipe and rotating the steel pipe based on the longitudinal central axis, the FBE coating part performs powder epoxy coating on the outer surface of the steel pipe, and the adhesive coating part coats the adhesive on the outer surface of the epoxy-coated steel pipe, , an outer surface coating step of coating PE on the outer surface of the steel pipe coated with an adhesive by the PE coating unit; removing the cap for rotating the steel pipe, and cooling the steel pipe by spraying water therein; The cooled steel pipe is seated on the inclined base of the inner diameter shot machine, the transport boom is put into the inside of the steel pipe by the transfer unit, and the shot ball is rotated and sprayed by the impeller spraying unit provided at the end to perform internal shot blasting. proceeding; And in a state in which the inner surface shot blasting is completed, the steel pipe is rotated by the rotating roller, the epoxy spraying transfer boom having an epoxy spray nozzle at the end is put into the steel tube by the boom transfer bogie, and the inner surface of the steel tube is coated with epoxy step; Coating the inner surface in an inner surface coating machine that rotates the inner surface shot blasting finished steel pipe and coats an epoxy paint including a curing agent having phenalkamine mixed with a main material and a main material having an epoxy resin; including; The step of performing the inner short blasting is, A rotating step of loading the cooled steel pipe onto the inclined base, and an unloading step of unloading the internal shot blasting finished steel pipe, A short ball transfer belt is installed on one side of the transport boom that is connected to the bogie and moves reciprocally, and the shot balls are supplied to a short ball supply box equipped with a plurality of rotary blades, and then discharged from the short ball supply hole, and the plurality of rotary blades rotate. A short ball supply step comprising a boom device for transport discharging to the inner diameter of the steel pipe; A cap device for an inlet inner diameter shot consisting of a cap body through which the transport boom device penetrates, the boom guide supporting the transport boom on the lower side is height-adjustable, and a cap body having a shot ball discharge part below the inlet internal diameter short cap. A cap step for an inlet-side inner diameter short comprising: A discharge-side inner-diameter short cap to which one end of the steel pipe is fixed is installed, and a center moving bar movable in the severance direction is installed on the reinforcing bar inside the cap body having a short ball discharge part downward, and protrudes in the direction of the discharge-side inner diameter short cap A discharge-side inner-diameter short cap step comprising a cap device for a discharge-side inner-diameter shot consisting of a steel pipe pedestal having a fixing rod coupled to and separated from the installed installation table; It is characterized in that it comprises a.