Measuring and testing – Vibration – By mechanical waves
Patent
1982-08-19
1985-06-04
Kreitman, Stephen A.
Measuring and testing
Vibration
By mechanical waves
73637, 264 401, 425141, G01N 2900
Patent
active
045206724
ABSTRACT:
Four ultrasonic probes in space quadrature are located near the input end of a water tank to define an opening for receiving extruded plastic tubing provided from an adjacent extrusion die. The probes are formed with passages that expel bubble-free water between the probes and tubing. Ultrasonic thickness measuring circuitry provides a wall thickness signal to a control signal source that also receives a diameter signal provided by a diameter sensor near the output end of the tank representative of the tube thickness. Compressed air is introduced inside the tubing through a pressure regulating valve that receives a pressure control signal from the control signal source, and the control signal source also provides speed control signals to a feed screw drive motor that drives the feed screw feeding plastic material into the extrusion die or the takeup reel drive motor that drives the takeup reel or other device receiving the finished tubing so as to maintain the diameter and wall thickness of the tubing substantially uniform.
REFERENCES:
patent: 3183709 (1965-05-01), Rankin et al.
patent: 3901071 (1975-08-01), Hansen
patent: 3955425 (1976-05-01), Corneau
patent: 4099418 (1978-07-01), Bennett et al.
patent: 4152380 (1979-05-01), Graves et al.
patent: 4328708 (1982-05-01), Bagwell
patent: 4377540 (1983-03-01), Cluett et al.
Hieken Charles
Kreitman Stephen A.
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