Fluid sprinkling – spraying – and diffusing – With signals – indicators – recorders – meters or changeable...
Patent
1999-08-18
2000-12-19
Kashinkow, Andres
Fluid sprinkling, spraying, and diffusing
With signals, indicators, recorders, meters or changeable...
239 71, B05B 1704
Patent
active
061617725
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a device for feeding a controlled volume flow of liquid to a spray nozzle for automatic spray application. The device includes a displacement pump type member arranged in a conduit defining a flow path from a liquid source to the spray nozzle. The member is arranged to be driven by driving means with movable parts of the driving means with a speed determined by an actual volume flow through the conduit. The present invention also includes a method for feeding a controlled volume flow of liquid to a spray nozzle for automatic spray application of the liquid.
BACKGROUND OF THE INVENTION
Devices and methods such as the present invention are utilized primarily when objects are spray painted in different ways. For the purpose of illuminating the invention and the problems to be solved thereby but not in any way restricting the invention, the case of spray painting carried out by a spray painting robot will hereinafter be discussed.
Automatic spray painting is used for obtaining a smooth paint finish with a paint layer homogeneously applied on an object it is very important to control the volume flow of paint to the paint nozzle with a high accuracy. For this reason, gear pumps have, until now, most often been used for feeding the paint in a conduit into a spray nozzle. This has surely resulted in highly precise control of the volume flow.
However, in some situations, the use of such pumps leads to inconveniences. There is a great need for saving paint so as to reduce the costs for the very spray painting. Also, the size of the arrangement of the gear pumps and the motors driving them needed to feed the flow of paint to the spray nozzle is generally too important and the weight thereof too high for locating an arrangement close to the spray nozzle, since this is placed on a part moving during the spray painting, such as at the end of a robot arm. This is a disadvantage, since there is a clear connection between the amount of the paint wasted and the distance between such a pump functioning as means for a regulated volume flow and the spray nozzle.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a device and a method of the type referred to above, which provides a remedy to the above-described inconveniences of known devices and methods.
This object is, according to the invention, obtained by the fact that a device of the type defined in the introduction also includes means arranged in the conduit upstream of the displacement pump type member and adapted to supply the flow through the conduit to the member and take care of the proper feeding of the liquid in the conduit. A valve means is located in the conduit. A device according to the present invention also includes means adapted to regulate the volume flow through the conduit by regulating the throttling degree of the valve means. Furthermore, a device according to the present invention includes a first means adapted to measure the pressure of the flow in the conduit downstream of the displacement pump type member and a second means adapted to measure the pressure of the flow in the conduit upstream of the displacement pump type member. An arrangement is adapted to compare the pressure values delivered by the two measuring means and on the basis of this comparison control the regulating means to influence the valve means for obtaining comparison pressure values corresponding to a volume flow predetermined by the choice of the speed of the movable parts of the displacement pump type member.
By arranging the displacement pump type member only for adjusting the volume flow of liquid desired in the conduit but not for causing the feeding of the flow into the conduit, the displacement pump type member may be made very small and light and be driven by a small driving means with a low power output. As a result, it is possible to place this member determining the volume flow very close to the spray nozzle, also when this is arranged on, for example, a robot arm. The feeding of th
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ABB Flexible Automation A/S
Bocanegra Jorge
Kashinkow Andres
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