Plant for automatic spray application of paint
First Claim
1. A plant for automatic spray application of paint through a spray nozzle included therein, said plant comprising:
- at least two arrangements for providing paint for spray application connected to the spray nozzle through first supply lines arranged in parallel to each other, means for feeding paint in the respective first line from the respective arrangement to the spray nozzle, first valve means arranged in the respective line downstream of the feeding means with respect to the feeding direction and controllable to open and close the fluid connection between the respective arrangement and the spray nozzle so as to allow spraying of paint coming from one arrangement at the time, a device adapted to, after feed of paint through one of said first lines to the spray nozzle followed by closing the associated valve means for changing to another arrangement providing paint, feed into said one first line at a location upstream of the associated first valve means with respect to the feeding direction such a volume of a fluid in the reverse direction with respect to said feeding direction that paint present in this first line is pushed back into the associated arrangement without the latter being reached by said fluid.
1 Assignment
0 Petitions
Accused Products
Abstract
In a plant for automatic spray application of paint through a spray nozzle (12), two parallel lines (9,10) each lead from an associated arrangement (1,2) for supplying paint to the spray nozzle. After paint has been fed through one of the lines to the spray nozzle followed by closing of a valve means (15,16) associated therewith for changing the arrangement (1, 2) supplying paint, a device (24) is adapted to feed such a volume of fluid into this line upstream of the valve means, with respect to the paint feeding direction, in the reverse direction so that the paint present in the line is pushed back into the arrangement without the fluid reaching it.
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Citations
18 Claims
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1. A plant for automatic spray application of paint through a spray nozzle included therein, said plant comprising:
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at least two arrangements for providing paint for spray application connected to the spray nozzle through first supply lines arranged in parallel to each other, means for feeding paint in the respective first line from the respective arrangement to the spray nozzle, first valve means arranged in the respective line downstream of the feeding means with respect to the feeding direction and controllable to open and close the fluid connection between the respective arrangement and the spray nozzle so as to allow spraying of paint coming from one arrangement at the time, a device adapted to, after feed of paint through one of said first lines to the spray nozzle followed by closing the associated valve means for changing to another arrangement providing paint, feed into said one first line at a location upstream of the associated first valve means with respect to the feeding direction such a volume of a fluid in the reverse direction with respect to said feeding direction that paint present in this first line is pushed back into the associated arrangement without the latter being reached by said fluid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for automatic spray application of paint through a spray nozzle, said method comprising selectively feeding paint to a spray nozzle from one of at least two arrangements for providing paint for spray application by the spray nozzle, so that spraying of paint from one arrangement at the time is made possible, wherein after feeding paint from one arrangement in a first line to the spray nozzle, when a change is carried out for feeding paint from the other arrangement, the first line is cut-off and a fluid is fed into this line upstream of the location for the cutoff with respect to the direction of said feeding of paint to the spray nozzle, said fluid being fed in the reverse direction with respect to said feeding of paint at such a volume that the paint present in the first line is pushed back into said arrangement without allowing said fluid to reach it.
Specification