Integration method of steel tube inner wall and outer wall powder spraying, curing and film-forming and device thereof

Abstract

The invention discloses an integration method of steel tube inner wall and outer wall powder spraying, curing and film-forming and a device thereof. In the method, mobile spraying and heating equipment is used to simultaneously carry out powder spraying, heating and curing, and a traction device is adopted to carry out heating and spraying with uniform speed under a set temperature on a steel tube. The integrated device comprises electrostatic spraying equipment, an air pump, a section of rail, a rail car integrating heating and spraying and a rail car and internal spray gun traction device. The steel tube is erected in the middle of the rail along the rail direction, the rail car spans the steel tube, an internal spray gun is arranged in the steel tube, a rail car and internal spray gun bracket is connected to the traction device through a steel wire rope, an electromagnetic induction power box is arranged at the upper part of the rail car, an electromagnetic heating cylinder and an external spray gun are fixed in the rail car, the air pump is connected to the electrostatic spraying equipment through a ventilating duct, and the electrostatic spraying equipment is connected to the rail car and the internal spray gun through powder transport hoses. The device has compact and reasonable structure, adopts a method of ultrasonic frequency electromagnetic mobile heating, synchronously sprays the inner wall and the outer wall of the steel tube, has the advantages of high processing product quality, field processing as well as steel tube weld bore and raw material process treatment, simplifies the pretreatment process, enhances the heat efficiency and lowers the cost.

Description

1. Technical field [0001] The invention relates to a powder spraying equipment, in particular to a method and a device for spraying epoxy resin powder specially used for steel pipes. 2. Background technology [0002] The current process of powder electrostatic spraying process is as follows: [0003] Pre-treatment→electrostatic powder coating→powder heating and curing (plasticizing) film forming→finished product [0004] Pretreatment: mainly degreasing and rust removal, the method is the same as the pretreatment of liquid paint. This is the first step in the process, and it is also the first independent working area (pre-treatment area) of the production workshop, which is partially completed in the pre-treatment pool. [0005] Electrostatic powder spraying: Under a high-voltage electrostatic field, connect the powder spray gun to the negative pole, and the workpiece is grounded (positive pole) to form a circuit. The powder is sprayed from the spray gun with the help of co...

AI Technical Summary

Problems solved by technology

[0010] 2. The production workshop is divided into various areas according to the function, which occupies a large area. The movement of the steel pipe between the various processes has a great impact on the quality of the cured film. Vibration powder drop is the most difficult problem to overcome;

[0011] 3. The oven (box) where the powder is heated and solidified (plasticized) to form a film is bulky (length 15M × width 4M × height 2M), usually heated by fuel oil or ordinary electric heating, with low thermal efficiency and serious heat loss;

[0012] 4. Affected by the large size of the pre-treatment tank, especially the curing oven (box), the entire processing process must be carried out in the planned and constructed workshop in advance, and it is impossible to move to the pipeline engineering site for on-site processing and steel pipe transportation High cost, high probability of damage during handling of the cured film, affecting the progress of the pipeline project;

[0013] 5. The low temperature of the steel pipe during the powder spraying process can not overcome the defects of low powder adhesion rate and thin film thickness;

[0014] 6. After the pipeline is welded, the epoxy resin anticorrosion film of the same process cannot be made on the welded part of the steel pipe, and only a simple anticorrosion treatment can be done with a solvent-based alternative product, which greatly reduces the anticorrosion level of the entire pipeline

Images