| 摘要 |
<p>The present invention relates to a device for detecting a flow of powder particles, particularly paint particles, said flow being arranged to flow in a transportation line (3, 6) between a reservoir (1) holding powder particles (2) and at least one powder spray gun (7) of the kind wherein an electrical field charges the particles. A portion (9) of the transportation line (3, 6) is provided on its interior face with an electrostatically friction-charging material and a signal-carrying line (10) interconnects a unit (11) for measuring electrical signals and the electrostatically friction-charging material in said portion (9). Finally, said unit (11) is provided with a third line (12) to close the circuit between said unit and said material in said portion (9). When the powder particles (2) are made to flow through the transportation line (3, 6), a charge is generated as a result of the friction arising upon contact between the particles and the friction-charging material in portion (9). This charge produces an electrical signal, which is detected by the measuring unit (11).</p> |
