Method for controlling a fiberizing device
A method for forming glass fibers by a rotary assembly including a shaft rotated about an axis of rotation, a centrifuge secured to the shaft and provided with a primary annular wall including a plurality of primary orifices, and a supply system configured to supply the centrifuge with molten glass, and wherein, under the effect of a centrifugal force resulting from a rotation of the rotary assembly, a primary reserve of glass is formed against the primary annular wall of the centrifuge, the method including a) acquiring, using a camera, of at least one primary image of the centrifuge, b) processing the at least one primary image by an image processing system, and c) evaluating a parameter representative of a volume of the primary reserve by a system for processing the data from the primary image.
1 . A method for forming glass fibers by a rotary assembly including:
a shaft rotated about an axis of rotation,
a centrifuge secured to the shaft and provided with a primary annular wall comprising a plurality of primary orifices, and
a supply system configured to supply the centrifuge with molten glass,
and wherein, under the effect of a centrifugal force resulting from a rotation of the rotary assembly, a primary reserve of glass is formed against the primary annular wall of the centrifuge,
the method comprising the following steps:
a) acquiring, using a camera, at least one primary image of the centrifuge,
b) processing said at least one primary image by an image processing system, and
c) evaluating a parameter representative of a volume of the primary reserve by a system for processing data from the at least one primary image.
2 . The method according to claim 1 , wherein the centrifuge includes an opening at its lower end, and in step a) the at least one primary image is acquired through said opening.
3 . The method according to claim 2 , wherein in step b) the image processing comprises an identification of at least one boundary of the primary reserve on the at least one primary image, and wherein the at least one boundary comprises an edge of the opening of the centrifuge and an upper edge of the primary reserve.
4 . The method according to claim 1 , wherein in step b) the image processing comprises an identification of at least one boundary of the primary reserve on the at least one primary image.
5 . The method according to claim 4 , wherein the identification of the at least one boundary comprises a determination of at least one series of points by a digital method for detecting contours and an ellipse adjustment of said at least one series of points.
6 . The method according to claim 5 , wherein the determination of at least one series of points for detecting contours is done by thresholding.
7 . The method according to claim 1 , wherein the camera used in step a) has an observation direction forming an angle with the axis of rotation.
8 . The method according to claim 1 , wherein the camera is an infrared camera.
9 . The method according to claim 1 , comprising, prior to step c), a step b′) of calibrating the data processing system by measuring an element of the rotary assembly on the acquired at least one primary image and comparing the measured value with a known dimension of said element.
10 . The method according to claim 1 , further comprising, at the end of at least one succession of steps a) to c), a step d) of determining a deviation of the volume of the primary reserve relative to a nominal value and of adjusting a rotational speed of rotation of the rotary assembly as a function of said deviation.
11 . The method according to claim 10 , wherein prior to step d), at least N successions of steps a) to c) are carried out, wherein N≥2.
12 . The method according to claim 11 , wherein said N successions are N successions regularly spaced over time.
13 . The method according to claim 12 , wherein said N successions are N successions regularly spaced every at least 30 seconds.
14 . The method according to claim 10 , wherein, when the rotational speed of the rotary assembly reaches a predetermined maximum value at the end of step d), an alert is emitted.
15 . The method according to claim 1 , wherein the rotary assembly further includes a basket arranged below the shaft, secured to the shaft and provided with a secondary annular wall comprising a plurality of secondary orifices, and under the effect of the centrifugal force resulting from the rotation of the rotary assembly, a secondary glass reserve is formed against the secondary annular wall and the method further comprises evaluating a parameter representative of a volume of the secondary reserve by the data processing system from said at least one primary image of the centrifuge or another image.