Inner and outer epoxy powder coatingФ219—Ф820 pipeline anti-corrosion production line

Inner and outer epoxy powder coatingФ219—Ф820 pipeline anti-corrosion production line

Ф 219 —Ф 820 inner and outer epoxy spray anti-corrosion production line


Steel pipe diameter: Ф 219 —Ф 820, Coating thickness: 300-500 μ, Steel pipe length: 8000 mm, Process speed: 3000 mm / min - 6000 mm / min



1, the project content:

Ф 219 —Ф 820 inner and outer epoxy spray anti-corrosion production line

2, the design basis:

Steel pipe diameter: Ф 219 —Ф 820
Coating thickness: 300-500 μ
Steel pipe length: 8000 mm
Process speed: 3000 mm / min - 6000 mm / min

3, the pipeline conveyor

According to the user's requirements, our company's Ф219 —Ф 820 steel inner and outer epoxy spray anti-corrosion production line is designed as a transmission line with a single wheel as the power unit, which makes the pipeline run more smoothly.
The base of the conveyor is welded with the national standard 18 # channel steel, 18 # square steel and 12 mm thick steel plate. The specification of this line conveyor is 1800 mm × 8000 mm × 6 ( 6 sets of tires per rack ). 1600 mm × 800 mm × 10 (one with a high temperature wheel and one with a power supply). The transmission wheel model is a 600-9 pneumatic tire, and the power is controlled by frequency conversion. The base of the transmission wheel is fixed on the uniform adjustment rail with 4 screws to facilitate the adjustment of the size of the tube.
In order to facilitate the pipe flange welded at each end to make the inner and outer anti-corrosion epoxy coating, each pair of drive wheels are equipped with the lifting device in the coating line. When the two flanges of the steel pipe (the same front and rear) travel to the lower set of transmission wheels, the proximity switch is actuated to drive the solenoid valve of the cylinder to operate, the cylinder acts, and the transmission wheel automatically descends. After the elapse of the time delay flange, The drive wheel frame is automatically raised, and each set of wheels is like this until the entire process is completed.

4, the descaling machine:

Based on the introduction of advanced technology from the United States and Italy, this machine adopts modern computer simulation technology to develop a new type of steel pipe outer wall treatment equipment, which can remove the rust and scale on the surface of the steel pipe and fully meet the cleaning requirements before the outer wall coating of the steel pipe. It can meet the needs of cleaning the outer wall of small and medium-sized engineering steel pipes. It has the following advantages:
1. The fifth-generation cantilever centrifugal blasting machine with large shot blasting and high throwing speed has significantly improved the cleaning efficiency and obtained satisfactory cleaning quality. It is a patented product.
2. The equipment has been successfully developed according to the redesign of advanced technology at home and abroad. It has the characteristics of high productivity, convenient operation and small volume, and is the first in China.

5, medium frequency heating system:

This production line is equipped with two intermediate frequency heating devices of 350KW and 800KW .
Before the 350KW is used in the descaling machine, the surface moisture of the steel pipe is removed to improve the descaling effect. 800KW is used for external epoxy powder coating heating.
The control part adopts a specially designed control circuit with over-voltage, over-current, voltage limiting / current limiting, phase loss, under-voltage, under water pressure and other protections.
The control line dedicated integrated box is completely isolated from the high pressure area to keep the control room clean and cool. Greatly improve control board life and system reliability.
350kw parameters:

Name Parameter Name Parameter
Input voltage 380V Output maximum voltage 780V
Input Current 580A Output maximum current 700A
Input frequency 50HZ Output frequency 500HZ ~ 800HZ
800kw parameters:
Name Parameter Name Parameter
Input voltage 380V Output maximum voltage 780V
Input Current 1330A Output maximum current 1600A
Input frequency 50HZ Output frequency 500HZ ~ 800HZ

6, dusting system:

8 gun control center. DK type 2 sets
Each apparatus having the above automatic gun 8, a high-pressure spray gun is built, control cabinet 8 controls automatic spray gun voltage, current and gas system. And control 8 venturi powder pump powder supply system.
Each apparatus above the fluidized bed containing the powder supply system 1 set, bed dimensions: 8 Venturi toner supply pump (L × W × H) 800 × 775 × 570 (mm) containing.

7, water cooling room:

It is closed with plastic steel and is beautiful and easy to observe. All are made into active windows, which are easy to access when adjusting. The pump uses two units of 100 cubic meters per hour (one spare). The cooling water pipe regulating valve is installed on the side of the operation cabinet for easy adjustment.

8, air compressor and pipe mechanism:

The production line is equipped with a 10- cube screw air compressor, a 10- cubic air dryer, and a 1.5- cubic gas storage tank for the powder spraying equipment, but the gas volume is surplus, so the pipe system is changed to the cylinder, saving Investment in hydraulic stations and hydraulic oil and the cost of changing hydraulic oil every year. Maintenance is also clean and convenient. A total of 8 forks and cylinders and 2 lift cylinders are required.

9, secondary descaling machine:

The secondary descaling adopts the wire wheel derusting and compressed air purging to ensure the cleanliness of the outer wall of the steel pipe meets the requirements and improve the adhesion of the epoxy powder.

10. Pipeline platform

The upper tube, the lower tube and the transition platform are all welded with 20# national standard I-beam, which ensures the robustness of the platform. The total length of the three platforms is 30 meters (depending on the site).
11. Internal epoxy powder coating equipment:
In the spraying operation, after the upper part of the workpiece, the inner spray gun is inserted into the steel pipe until the entrance position of the spray chamber, and the inclined wheel rotates to make the workpiece rotate and advance horizontally. After the intermediate frequency is heated to about 200 °C and reaches the position of the spray chamber, the inner and outer spray guns are sprayed. The workpiece is sprayed and the heat is applied to solidify the powder. When the workpiece exits the spray chamber for about 1.5-2 minutes, it enters the water cooling station, and after cooling, it is transported to the lower part of the lower platform by the inclined wheel. After the workpiece is sprayed, the inner spray gun retreats by about 14m , and the upper part repeats the work. The excess powder generated during the external spraying process is reused in the recovery system, and the cyclone + capped filter recovery device is used for recycling. The recovery fan is 4-72-4#/5.5KW . The recycling is secondary recovery, the cyclone collects most of the powder, and a small amount of powder enters the filter recovery, which not only reduces the filter load, but also ensures the discharge environment.
12. Manufacturing and installation schedule
Production duration of the effective date of the contract within 7 0 days production is completed, the installation period 30 days (installation conditions are met).

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