| 摘要 |
#CMT# #/CMT# A surface treatment plant, with treatment solution tanks, a treatment booth (1) with a solution suction device (36) and a common solution supply circuit (including a distribution line (2) and a solution supplying suction line (3)), has compressed air generator(s) (11) and compressed air circulation circuit(s) (10), connected to the common circuit to supply compressed air to purge the distribution and suction lines. #CMT# : #/CMT# A surface treatment plant comprises several treatment solution tanks (provided with valved delivery lines and recycling lines); a treatment booth (1) with a solution suction device (36); and a common circuit to the storage tanks for supplying solutions, including a distribution line (2) having a tank section (5) (into which the tank lines open) and a suction line (3) connecting the distribution line to the suction device to supply solution. The novel features are that the plant includes compressed air generator(s) (11) and compressed air circulation circuit(s) (10); and the common circuit has a compressed air inlet connection (14) to the compressed air line, to supply compressed air to purge the distribution and suction lines. An independent claim is included for a corresponding surface treatment method using the plant, in which after every treatment operation compressed air is supplied into the common circuit to purge at least the distribution and suction lines. #CMT#USE : #/CMT# The plant is useful for treating (e.g. cleaning, degreasing, pickling, scouring, chroming or phosphating) surfaces of articles, generally before applying a paint or other coating. In particular several different surface treatments (e.g. base treatment, rinsing, acid treatment, rinsing and final coating) are carried out in succession in a single booth. The articles are preferably metal (specifically aluminum or steel)joinery profiles (e.g. for window frames), although treatment of non-metallic articles (e.g. of plastics) is also possible. #CMT#ADVANTAGE : #/CMT# Reduced amounts of liquid are entrained from one storage tank into another; in particular entrainment of corrosive or preparation solutions are entrained into the next rinsing solution. The booth is compact and simple to construct and utilize, and has a low water and energy requirement. The same batch of water (or solution) can be reused several times. Storage of dangerous and toxic materials is minimized. The plant generally has a modular construction, and can be easily adapted for different treatments or different articles. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The figure shows a schematic view of one form of the surface treatment plant. 1 : Treatment booth 2 : Distribution line 3 : Suction line 4 : Evacuation line 5 : Tank section of distribution line 10 : Compressed air circulation circuit 11, 13 : Air compressors 12 : Manometer 14, 16 : Compressed air inlets 15, 17 : Compressed air line control valves 20 : Extraction line 33 : Waste storage reservoir 36 : Treatment solution suction device 37 : Evacuation opening 38 : Booth floor 39 : Gas suction and scrubbing unit 40, 42 : Suction lines 43 : Quality control laboratory 49 : Downstream end of parallel line A1 : Basic treatment solution for aluminum (Al) articles A2 : Acidic treatment solution for Al articles A3 : Coating solution for Al articles A4 : Acidic treatment solution for steel articles A5 : Further treatment solution for steel articles ED : Distilled water inlet valve H2O : Water recycling valve R1a - R1f, R2a - R2e : Rinsing water from respective storage tanks SU : Used solution line valve #CMT#METALLURGY : #/CMT# Preferred Apparatus: The compressed air inlets can be adapted to allow entry of air into the common circuit to purge the whole circuit. At least one rinsing solution storage tank is included, together with lines for delivering and recycling the solution. The suction line (3) is attached to the downstream end of the distribution line (2), which has a pump downstream of the tank section (5) (for circulating treatment solutiom from the tank section to the suction line) and a first compressed air inlet (14) at its downstream end. Each storage tank has its own single tank line for delivering and recycling the contained treatment solution; and the common circuit has a valved evacuation line (4) connecting a evacuation opening (37), located in the booth floor (38), to the distribution line downstream of the tank section. |
