Tube wall thickness measuring device and extrusion apparatus wit

Details Tube wall thickness measuring device and extrusion apparatus wit Tube wall thickness measuring device and extrusion apparatus wit

1986-03-26

1988-09-06

Hoag:, Willard

Plastic article or earthenware shaping or treating: apparatus

With indicator, signal, recorder, illuminator, or inspection...

73622, 425141, 425377, B29C 4792, G01B 1702

Patent

active

047689404

ABSTRACT:
A device for measuring the wall thickness of an extruded tube by means of ultrasonic pulses comprises a tube wall thickness measuring instrument being rotatable about the circumference of the tube and being connected to an arm extending in a plane perpendicular to the tube. The arm is hingedly connected in said plane to a ring perpendicular to the axis of the tube and concentrically about the tube. The arm bears a weight outside said ring. An adjustable pressure element, such as a spring or preferably a two way operable air cylinder, acts upon the arm.
The measuring element may engage two supporting faces, the angle between the supporting faces being adjustable.
Furthermore a detachable fixing element, such as a magnet, engages the arm so that the arm can be disconnected from the magnet and may be moved from the plane perpendicular to the tube.
The wall thickness is measured only by means of one echo coming from the inner wall of the tube when an ultrasonic pulse emitted by the device hits said wall.

REFERENCES:
patent: 3892043 (1975-07-01), Bonikowski
patent: 3955425 (1976-05-01), Corneau
patent: 4137025 (1979-01-01), Graves et al.
patent: 4137028 (1979-01-01), Reitemeyer
patent: 4328708 (1982-05-01), Bagwell
patent: 4339404 (1982-07-01), Upmeier et al.
patent: 4551289 (1985-11-01), Schwab et al.
patent: 4586379 (1986-05-01), Burkhardt

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