Since the 480s seamless steel pipes of the Kyrgyzstan-Kazakhstan long-distance transmission have cited the anti-corrosion technology of the petroleum bitumen of the former Soviet Union, petroleum bitumen has been the most commonly used anti-corrosion layer for a long period of time in China. In the 1970s and 1980s, various anti-corrosion materials such as tapes, jackets, epoxy powders, etc. were put into use one after another, and the situation in which petroleum asphalt dominated the world began to change.
In 1995, the coal tar enamel anti-corrosion layer began to be applied in seamless casings such as the Wankuo Double-track and Jingxi. By the late 1990s, the two types of anti-corrosion coatings of FBE and three-layer polyethylene gradually developed. In the mainstream, double-layer epoxy (double-layer FBE) has gradually begun to be used in recent years.
The main function of 3PE anticorrosion steel pipe fused epoxy powder coating is to form a continuous coating film and directly bond with the steel pipe surface, which has good chemical resistance and anti-cathode stripping performance; and the active group of the intermediate layer adhesive. The reaction forms a chemical bond, ensuring that the overall coating has good adhesion at higher temperatures. The middle layer is usually a copolymer adhesive, whose main component is a polyolefin, and a vinyl copolymer adhesive is widely used at present.
The polar functional groups of the copolymer adhesive and the epoxy groups of the fused epoxy powder coating may react to form hydrogen bonds or chemical bonds, so that the intermediate layer and the bottom layer form a good bond; the non-polar ethylene portion and the surface layer Polyethylene has a very good affinity, so the intermediate layer and the surface layer also have good adhesive properties. The main role of polyethylene surface layer is to play a role of mechanical protection and anti-corrosion, with the traditional two-layer structure of polyethylene
To achieve automatic control of the whole machine, which has the characteristics of high productivity, reliability and advanced degree of automation.
1. Workpiece cleaning sequence: Feeding bracket → Feeding on the feeding mechanism → Entering the blasting chamber → Shot blasting (rotating the workpiece while moving forward) → Sending the blasting chamber → Blanking under the feeding mechanism → Blanking bracket
2. Projection Cycle Sequence: Projectile Storage → Flow Control → Shot Blasting Workpiece → Bucket Elevator Vertical Lift → Pellet Separation → (Recycle)
The shot blasting device used in this equipment is the unit plate curve blade. It is our advanced technology installed by precision machining. It is mainly composed of the impeller, the main shaft and the main bearing seat, the housing, the orientation sleeve, the dividing pill wheel, the blade and the guard plate. , transmissions, motors and bearings and other components. The blaster is a unit plate structure, so the inflow of the projectile is good, and the projected amount of unit power is large. The impeller of the blaster is close to the spindle end, the structure is reasonable, the layout is reasonable and compact, and the maintenance is convenient.