Application of powder electrostatic spray on highway barrier board

the requirements of highway barrier board, with the development of China's highway construction and more and moreBecause the protective blocking plate is placed in the open air, affected by the climate and the environment, so the surface coating technology of the protective blocking plate is high, so that the surface coating film has good weather resistance, corrosion resistance and other properties, the appearance has the ideal decorative propertiesChina's highway protection blocking plate to hot galvanizing plate for many, its appearance color is single, and weather resistance and corrosion resistance and other properties are lower than the performance of powder electrostatic spray plate, and powder electrostatic spray process pollution-free, powder color diversification is comparable to other coating processAt present, a large number of foreign use of powder electrostatic spray protection blocking platein order to adapt to the development requirements of China's highway barrier, Zhejiang University coating technology engineering company designed and manufactured a 600 km annual output of the bar blocking plate powder electrostatic spray production lineFrom the actual use of equipment, this production line reached the design indicators, spraying product performance is better1 production line process overview This production line consists of two lines: the first, semi-automatic slot-immersed workpiece pretreatment and workpiece dewatering assembly line;1.1 slot immersion pretreatment process highway protective blocking plate material is hot-rolled plate, its surface oxidized at high temperature and produces oxidizing skinThe removal of the oxide skin depends on the penetration (penetration) of the rust remover on the oxide skinThey use mixed acids to add additives, at room temperature with rapid penetration, de-oiling, chromium, corrosion and other short-term removal of skin oxidation functionThis solves the problem of high temperature of conventional sulfuric acid method, large environmental pollution and material performance, and greatly reduces the investment cost of equipment and plant maintenancethe phosphate process of the workpiece using the normal temperature slag-free phosphating technology, to solve the current temperature-free phosphating process energy consumption, residue, yellowing and other problems, and production technology management is convenient, with pommymeter and PH test paper can be adjusted and controlledEach kilogram of working fluid can handle the workpiece 50-60m2, at the temperature 0-35 degrees Celsius, time 3-5min, the resulting phosphating film is constant in 2.0-2.5g/m2, to ensure the post-process spraying requirementspassivation process uses a non-toxic passivation agent to solve the current problem of environmental pollution of phosphating after treatment of chromic acid and severe chromate passivation, and to improve the corrosion resistance of phosphating film and improve the adhesion of the coatingthe workpiece is dehydrated as a box oven, using the fuel heating heating, hot air circulation heating method, while the water gas is forced outAfter dehydration, the workpiece is transferred directly to the rear channel fully automatic electrostatic spray powder and powder curing assembly line1.2 automatic electrostatic spray powder and powder curing process electrostatic spray powder and powder curing process using hanging conveyor chain form connection, workpiece son-on-line after static spray powder and powder curing after the line, product inspection qualified into the warehouse powder electrostatic spray equipment using 8 automatic spray gun double-function spray, variable frequency speed lifter control the speed and range of movement of the spray gun, the use of small cyclone first-level recycler, pulsed air anti-blow filter recycler for the second-stage recycler; powder curing using a straight-through oven, fuel heating heat exchange, hot air in-cycle heating form The imported burner is used as a heat source and is burned in the stainless steel combustion chamber, resulting in high temperature flue gas discharged through the high-efficiency heat exchanger The use of high-temperature fans allows the air in the oven to exchange heat through an efficient heat exchanger, so that the temperature in the oven meets the requirements of powder curing suspension conveyor chain using a single point lifting weight of 100kg light suspension chain, taking into account the longer size of the protective barrier, so the hanging device using a soft connection, so that the workpiece in the cornering and up and down the ramp to minimize the impact on the suspension chain system 2 production line process and its equipment technical parameters 2.1 pre-processing process groove body form factor: 5200mm x 1000mm x 1500mm (lX w X H) a total of 8 anti-corrosion slot parts transmission: hand-controlled driving and lifting Immersion furnace form factor: 5200mm x 2900mm x 2000mm (lX W X H) heat consumption: 60,000 card temperature control range: 75-140 degrees Celsius heating speed; 0 degrees Celsius heating mode: fuel heating and heat exchange, hot air circulation 2.2 powder electrostatic spray and curing process 2.2.1 powder electrostatic spray equipment form factor: 7000mm x 5000mm x 3000mm (length X wide X X High) power consumption: 15KW compressed air consumption: 180m3/h (table pressure 0.55MPa) 2.2.2 powder curing equipment equipment form factor: 42000mm x 1200mm 4000mm (length X wide X high) heat consumption: 400,000 card temperature control range: 150-200 degrees Celsius heating time: less than 60min heating to 180 degrees Celsius heating mode: fuel heating heating, hot air in-cycle 2.2.3 suspension conveyor QXT-300/100 type light bearing chain suspension conveyor 3 summary of the powder electrostatic coating production line after trial operation, its technical, economic, practical has been affirmed by the user