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Test & measurement


Efficient paint spraying in the automotive industry


A


n integral component in the manufacturing of vehicles is painting the bodywork. Particularly during the


early period of car manufacturing, high-gloss bodywork finishes were associated with high cost and time expenditure. The first electrostatic rotary atomisers were developed in the 1980s and 90s. The advantage of rotary atomisers (also


known as paint robots) are their economic use of material: thanks to the high-voltage paint charge, 90 per cent of the paint is applied directly onto the bodywork and is no


longer wasted. Rotary atomisers of this kind merely require a rotating disc. The paint to be atomised forms a film on


the disc which becomes increasingly thinner towards the edges and dissolves into droplets whose size is controlled via the speed of rotation. A nozzle ring is required around the atomiser to direct and shape the paint jet. The atomiser can therefore be operated in any position and can be used for external as well as internal finishings. This type of rotary atomiser is therefore ideal for the car industry.


safe pressure transmitter for the spray head


KELLER was able to supply intrinsically safe pressure transmitters and intrinsically safe temperature sensors to a client who produces paint robots for the car industry. You make ask why they are intrinsically safe.


Even though non-flammable water-based paint is usually used on bodywork par ts, the mist that is created during atomisation can take on a flammable state. Although hazards only occur in the rarest case during paint spraying, rotary atomisers must be equipped with explosion-proof technology. Some pressure transmitters are fitted in


the spray head of the robot where they measure the spray pressure in the paint spray system and detect quick pressure changes which are caused, for example, through the


24


placing of hoses. The pressure transmitters are located in a high-voltage field and communicate with the robot control mechanism via a fibre-optic cable, whereas additional pressure transmitters and temperature sensors monitor the dosing system and the pumps of the axes. These pressure transmitters communicate with the control system through conventional analogue means via copper conductors.


KELLER keller-druck.com November 2020 Instrumentation Monthly


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