IN-SITU ON-LINE DETECTION DEVICE AND METHOD FOR LONG-DISTANCE METALLURGICAL LIQUID METAL COMPONENT

• US 20160131581A1
• Filed: 11/28/2013
• Published: 05/12/2016
• Est. Priority Date: 07/15/2013
• Status: Active Grant

• Current Assignee: Shenyang Institute of Automation of the Chinese
• Original Assignee: Shenyang Institute of Applied Ecology Chinese Academy of Sciences (Chinese Academy of Sciences)
• Inventors: SUN, Lanxiang, XIN, Yong, QI, Lifeng, LI, Yang, CONG, Zhibo, YU, Haibin
• Granted Patent: US 9,797,835 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G01B 11/14 for measuring distance or clearance between spaced objects or spaced apertures G01B11/26 takes precedence; rangefinders G01C3/00
• CPC Class Codes: G01N 2021/695 Molten metals
• CPC Class Codes: G01N 21/21 Polarisation-affecting properties G01N21/19 takes precedence
• CPC Class Codes: G01N 21/63 optically excited
• CPC Class Codes: G01N 21/718 Laser microanalysis, i.e. with formation of sample plasma
• CPC Class Codes: G01N 21/8507 Probe photometers, i.e. with optical measuring part dipped into fluid sample
• CPC Class Codes: G01N 2201/06113 Coherent sources; lasers
• CPC Class Codes: G01N 2201/0636 Reflectors
• CPC Class Codes: G01N 2201/0683 Brewster plate; polarisation controlling elements
• CPC Class Codes: G01N 2201/088 Using a sensor fibre
• CPC Class Codes: G01N 33/205 in liquid state, e.g. molten metals

Abstract

An in-situ on-line detection device and detection method for a long-distance metallurgical liquid metal component. The detection device comprises a front-end high-temperature resistant probe (18), a middle-end optical sensing device (19) and a back-end control platform (24), wherein the head of the front-end high-temperature resistant probe (18) is placed in a liquid metal (22), the tail thereof is coaxially connected to the middle-end optical sensing device (19), and an optical window (15) is arranged in the connection position; and the middle-end optical sensing device (19) is connected to the hack-end control platform (24) through a signal line (25). The detection device and detection method can provide a timely and valid message for quality control and a melting end, so that the detection time is greatly shortened, the detection distance can he adjusted extensively, the measurement result is accurate, and it can he achieved to measure components that are difficult to measure such as C, S, P, etc.

Claims

1. An in-situ online detection device for a long-distance metallurgical liquid metal component, wherein;

the head of a front-end high-temperature resistant probe (18) is placed in liquid metal (22), the tail thereof is coaxially connected to a middle-end optical sensing device (19), and an optical window (15) is arranged in the connection position; and

the middle-end optical sensing device (19) is connected to a back-end control platform (24) through a signal line (25).

2. The in-situ online detection device for the long-distance metallurgical liquid metal component according to claim 1, wherein:

in said middle-end optical sensing device (19), a remote beam expanding and focusing module (7) is arranged coaxially in the axis direction in which a laser generating module (6) emits laser beams;

a first reflecting mirror (9) is arranged on the optical axis of the emergent direction of the remote beam expanding and focusing module (7) and forms an angle of 45°

with the optical axis thereof;

a second reflecting mirror (10) is arranged. on the optical axis of the incident direction of a remote signal collecting module (11) and forms an angle of 45°

with the optical axis thereof; and

a connecting line of the centers of the first reflecting mirror (9) and the second reflecting mirror (10) is perpendicular to the axes of the remote beam expanding and focusing module (7) and the remote signal collecting module (11);

a light splitting piece (20) and an optical fiber coupling module (13) are respectively arranged on the optical axis of the emergent direction of the remote signal collecting module (11);

the optical fiber coupling module (13) is connected with an optical fiber spectrometer (14) through an optical fiber (21); and

the fiber spectrometer (14) is connected with a back-end control platform (24) through a signal line (25); and

a real-time imaging module (12) is vertically arranged on the optical axis of the reflecting direction of the light splitting piece (20), and is connected with the back-end control platform (24) through the signal line (25).

3. The in-situ online detection device for the long-distance metallurgical liquid metal component according to claim 1, wherein:

said front-end high-temperature resistant probe (18) is an inverted cone in which inert gas is charged so that the optical paths of excitation laser beams and collected plasma signal light are in a closed inert gas environment.

4. The in-situ online detection device for the long-distance metallurgical liquid metal component according to claim 1, wherein:

said back-end control platform (24) comprises a laser power supply and control unit (1), a time synchronization controller (2), an air inlet control unit (3) and a displacement platform control unit (4), wherein the above-mentioned units are connected with the middle-end optical sensing device (19) through the signal line (25).

5. The in-situ online detection device for the long-distance metallurgical liquid metal component according to claim 2, wherein further comprises a laser distance measuring module (8) which is arranged in the direction of the connecting line of the centers of the first reflecting mirror (9) and the second reflecting mirror (10) and the laser distance measuring module (8) is connected with the back-end control platform (24) through the signal line (25).

6. The in-situ online detection device for the long-distance metallurgical liquid metal component according to claim 2, wherein said middle-end optical sensing device (19) further comprises a temperature control module (5) and is connected with the back-end control platform (24) through the signal line (25);

and said temperature control module (5) comprises a temperature sensor and a temperature adjusting device for real-time monitoring and adjustment of the internal temperature of the middle-end optical sensing device (19).

7. The in-situ online detection device for the long-distance metallurgical liquid metal component according to claim 1, wherein said laser generating module (6) comprises two groups of laser heads, half-wave plates and polarizing light splitting pieces;

said half-wave plates are coaxially arranged on the optical axes of the laser emergent directions of the laser heads and are perpendicular to the optical axes; and

said polarizing light splitting pieces are coaxially arranged on the optical axes of the emergent directions of the half-wave plates and form Brewster'"'"'s angles with the optical axes, and the second polarizing light splitting piece (31) can receive the laser beams reflected by the first polarizing light splitting piece (30).

8. The in-situ online detection device for the long-distance metallurgical liquid metal component according to claim 2, wherein said remote beam expanding and focusing module (7) comprises a first movable base (32) and a diverging lens and a converging lens which are coaxially arranged in the emergent direction of the laser generating module (6);

said first movable base (32) can move on the optical axis of the emergent direction of the laser generating module (6);

said diverging lens is arranged in the first movable base (32) perpendicularly to the optical axis; and

said converging lens is arranged between the first movable base (32) and the first reflecting mirror (9) perpendicularly to the optical axis.

9. The in-situ online detection device for the long-distance metallurgical liquid metal component according to claim 2, wherein said remote signal collecting module (11) consists of a second movable base (37), a hyperboloidal reflecting mirror (38) and a paraboloidal reflecting mirror (39) and is connected with the back-end control platform (24) through the signal line (25);

said second movable base (32) can move on the optical axis of the emergent direction of the second reflecting mirror (10);

said hyperboloidal reflecting mirror (38) is parallel to and coaxial with the emergent direction of the second reflecting mirror (10), and is arranged in the second movable base (37); and

said paraboloidal reflecting mirror (39) is arranged between the hyperboloidal reflecting mirror (38) and the light splitting piece, and a central hole is reserved in the center.

10. The in-situ online detection device for the long-distance metallurgical liquid metal component according to claim 2, wherein said remote signal collecting module (11) consists of a second movable base (37), a spherical reflecting mirror and an aspherical reflecting mirror and is connected with the back-end control platform (24) through the signal line (25);

said second movable base (32) can move on the optical axis of the emergent direction of the second reflecting mirror (10);

said spherical reflecting mirror is parallel to and coaxial with the emergent direction of the second reflecting mirror (10), and is arranged in the second movable base (37); and

said aspherical reflecting mirror is arranged between the spherical reflecting mirror and the light splitting piece, and a central hole is reserved in the center.

11. The in-situ online detection device for the long-distance metallurgical liquid metal component according to claim 2, wherein said optical fiber coupling module (13) comprises a third diverging lens (40), a third converging lens (41) and a fourth converging lens (42) which are coaxially placed in parallel in sequence, and the optical axis thereof coincides with the optical axis of the remote signal collecting module.

12. The in-situ online detection device for the long-distance metallurgical liquid metal component according to claim 2, wherein said real-time imaging module (12) comprises an achromatic lens (43) and a CCD (44);

and the achromatic lens (43) and the CCD (44) are coaxially placed;

the axis direction thereof is perpendicular to the direction of the optical axis of the remote signal collecting module (11); and

the axis passes through the center of the light splitting piece (20).

15. The in-situ online detection device for the long-distance metallurgical liquid metal component according to claim 2, wherein:

said back-end control platform (24) comprises a laser power supply and control unit (1), a time synchronization controller (2), an air inlet control unit (3) and a displacement platform control unit (4), wherein the above-mentioned units are connected with the middle-end optical sensing device (19) through the signal line (25).

16. The in-situ online detection device for the long-distance metallurgical liquid metal component according to claim 2, wherein said laser generating module (6) comprises two groups of laser heads, half-wave plates and polarizing light splitting pieces;

said half-wave plates are coaxially arranged on the optical axes of the laser emergent directions of the laser heads and are perpendicular to the optical axes; and

said polarizing light splitting pieces are coaxially arranged on the optical axes of the emergent directions of the half-wave plates and form Brewster'"'"'s angles with the optical axes, and the second polarizing light splitting piece (31) can receive the laser beams reflected by the first polarizing light splitting piece (30).

13. An in-situ online detection method for a long-distance metallurgical liquid metal component, which is characterized by comprising the following steps:

placing the head of the front-end high-temperature resistant probe (18) in liquid metal (22); and

charging inert gas through the air inlet pipe (16) of the high-temperature resistant probe to form a closed inert gas environment;

emitting distance measuring laser by the laser distance measuring module (8);

after the distance measuring laser passes through the first reflecting mirror (9) and the second reflecting mirror (10), irradiating the distance measuring laser on a liquid metal surface (23);

measuring the position. information of the liquid metal surface (23); and

feeding the same back to the back-end control platform (24);

performing focusing adjustment on the first movable base (32) and the second movable base (37) by the back-end control platform (24) through the position information of the liquid metal surface (23) fed back by the laser distance measuring module (8) so that the focal position, on Which the laser focuses, for exciting the plasma and the collection position of remote signals coincide on the liquid metal surface (23);

receiving a laser generating signal of the back-end control platform (24) by the laser generating module (6);

emitting laser beams;

after the laser beams pass through the remote beam expanding and focusing module (7), irradiating the laser beams on the first reflecting mirror (9);

enabling the reflected laser beams to pass through the second reflecting mirror (10); and

irradiating the laser beams to the liquid metal surface (23) through the inert gas environment of the front-end high-temperature resistant probe (18) to produce plasma signal light;

transmitting the generated plasma signal light to the remote signal collecting module (11) through the inert gas environment of the front-end high-temperature resistant probe (18);

forming parallel plasma signal light through the paraboloidal reflecting mirror (39) and the hyperboloidal reflecting mirror (38) in the remote signal collecting module (11); and

transmitting the same to the optical fiber coupling module (13) through the light splitting piece (20); and

after the parallel plasma signal light passes through the optical fiber coupling module (13), transmitting the parallel plasma signal light to the optical fiber spectrometer (14) through the optical fiber (21) for performing light signal collection and photoelectric conversion; and

feeding the same back to the back-end control platform (24) to finish the collection of the plasma signal light.

14. The in-situ online detection method for the long-distance metallurgical liquid metal component according to claim 13, wherein further comprises the real-time imaging module (12) which receives a part of signal light and scene background light reflected by the light splitting piece (20), feeds the same back to the back-end control platform (24), displays the appearance of the liquid metal surface (23) and the formation condition of the plasma in real time, and adjusts the focusing position and the collection position in real time.