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Preservation Lines

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On the preservation line, sheets and profiles are thoroughly blast cleaned and provided with a temporary corrosion protection coating. Along with the external transportation unit, the preservation line consists of a pass through blasting and painting machine, a painting unit and a drying tunnel with its associated slat conveyor.

Typical plates widths can vary up to 2500mm, height can vary from 5mm to 1000mm, length can vary from 2000mm to 12000mm.

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1. Workpiece conveyor system

The whole roller conveyor system adopts frequency control step-less speed regulation, is able to synchronous running, each department is capable of independent action.

Blast cabinet’ rollers are with special wear-resistant sleeves to prevent blasting abrasion.

Plate chain conveyor with "v" shaped structure, painted steel short-term exposure to avoid film damage.


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2. Blasting cleaning

Workpiece detection (measure height) adopted world-famous brand photoelectric detection, workpiece width measurement device send a signal to PLC so as to

automatically adjust abrasive feeding valve opening number.


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3. Abrasive cleaning up

First level: Brush+abrasive reclamation

Second level: high-pressure blower blow the workpiece twice one after another after blast cleaning


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4. Abrasive reclamation system

Each of the abrasive reclamation system drive points equipped failure alarm function.


5. Dust collector system

Using HR4-48 Donaldson filter material cartridge dust collector, the dust removal efficiency ≥ 99.5%, dust emission is less than 30mg/M3.

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6. Spray room

Adopting GRACO X45DL4 high-pressure Airless spraying pump, compression ratio 45:1, flow 38L/min,

Using a standard linear guide trolley, frequency conversion buffer on both ends of trolley stroke. Workpiece detection and transmission system separated from the spray gun set, paint mist interference-free, easy to clean paint scale.


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7. Drying room

Adopt dielectric Heaters and hot air circulation principle so that the heat can be fully utilized.

Drying room temperature adjustable from 40℃ to 70℃

Plate chain conveyor systems increase the eccentrical wheels, which saved the problems of deviation and high rate failure.


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8. Paint mist filtration devices and harmful gas purifier

This system has automatic explosion-proof alarm function for paint mist concentration. Adopt advanced cardboard to filter paint mist, it is maintenance-free within one year, using activated carbon for adsorption of harmful gases. After this system it will be in accordance with the air pollution emission standards. (Paint mist emission standard ≤ 120mg/M3, p-xylene: emissions concentrations ≤ 70mg/M3, the 15 meters height exhaust pipe allows the secondary emission rate is 1.0kg/h. )


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