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Method and apparatus for conveying electrically conductive paints between different voltage potentials
| Details |
Inventors: Ott, Winfried;
Assignee: LacTec GmbH Gesellschaft fuer moderne Lackiertechnik (Rodgau, DE)
Primary Examiner: Crispino; Richard
Assistant Examiner: Koch, III; George R.
Attorney, Agent or Firm: Fasse; W. F., Fasse; W. G.
An electrostatic paint atomizer connected to a discharge station at high voltage is supplied, via an isolating conveying line, with individual divided-off quantities of paint enclosed between two pigs from a loading station at the other end of the conveying line. The paint is conveyed by a transport device supplying a thrust medium (compressed air or insulating liquid) to discharge the paint in the discharge station. A reverse transport device operating with compressed air transports the pigs back to the loading station. The length (L) of the conveying line between the loading and the discharge stations and the length (l) of a divided-off quantity of paint, are dimensioned to provide a sufficiently long isolating path (L-l) to avoid a voltage flashover. A continuous supply of paint is achieved with two parallel conveying lines, through which quantities of paint are metered with an offset from each other. |
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DETAILED DESCRIPTION Accordingly, the invention is based on the object of providing a simply structured method which requires comparatively low outlay on control and is also suitable for automatic quick color-change systems.
According to the invention, this object is achieved by individual quantities of paint being divided off and moved at intervals in space and time along a conveying path between the supply system and the consumer, the length of the conveying path exceeding the extent of the individual quantities of paint in the conveying direction by an amount that is sufficient as an isolating path.
The invention also relates to an apparatus for implementing this method, having a conveying line for paint, which is connected into the connection between a grounded supply system, especially a color changer, and a consumer at high voltage, especially an electrostatic atomizer.
To this extent, also, the abovementioned object of the invention applies, namely to provide an apparatus which is constructed comparatively simply, manages with a low outlay on control and can also be used for automatic quick color-change systems.
According to the invention, this apparatus is defined by the fact that the conveying line consists of an insulating material, there are arranged in the conveying line at least one pair of pigs comprising a rear pig and a front pig, the rear end of the conveying line is assigned a loading station for supplying divided-off quantities of paint between the two pigs, the front end of the conveying line is assigned a discharge station for removing the divided-off quantities of paint from the conveying line, a transport device is provided to displace the pair of pigs with an accommodated quantity of paint from the loading station to the discharge station, and a reverse transport device to displace the pair of pigs from the discharge station to the loading station, the length of the conveying line between the loading station and the discharge station and the length of the unit quantities of paint accommodated between the pigs are dimensioned such that the added conveying-line sections upstream and downstream of the unit quantities of paint always form an isolating path of sufficient length between the loading station and the discharge station
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Semiconductor manufacture 
