Metal founding – Miscellaneous – apparatus
Patent
1990-02-20
1991-11-26
Batten, Jr., J. Reed
Metal founding
Miscellaneous, apparatus
164417, 266216, B22D 1110
Patent
active
050675532
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to an improvement in a powder feeder in continuous casting.
The applicant has proposed a powder feeder in which each discharge port of a plurality of powder storage hoppers is connected to a final-stage powder container for mixing powder through a spring feeder. One end of the spring feeder is provided with an oscillating mechanism and is connected to the discharge port of the final-stage powder container, and the other end of the spring feeder meets the powder receiver in front of the final-stage powder container as a free end. The spring feeder is arranged so as to achieve return movement back and forth relative to the powder receiver (Japanese Patent Publication No. 57-54228).
The applicant has also proposed a tundish car on which is mounted a powder feeder equipped with a pair of spring feeders. The ends of pipe assemblies which extend from the base assemblies of the spring feeders swing horizontally back and forth in opposite directions near the strand nozzles, resulting in improved spreading of the casting powder (Japanese Patent Publication No. 61-11703).
However, the conventional powder feeder is arranged with the final-stage powder container at the same height as the work space of the mold. That is, since the end of the spring feeder provided with the oscillating mechanism is connected to the discharge port of the final-stage powder container, and the other end of the spring feeder meets as a free end to the powder receiver in front of the final-stage powder container, the final-stage powder container is inevitably placed at the same height as the mold and the tundish.
The final-stage powder container thus provided at the same height as the mold height is an obstacle to the casting operation. To remove this obstacle, the powder feeder including the final-stage powder container is arranged on the side opposite to the mold operator.
However, on the side of the continuous casting machine opposite to the operator, dust and molten steel are scattered. Under such conditions, maintenance work is very difficult and safety is a problem.
Furthermore, the relatively simple motion of swinging the conventional spring feeder results in a portion of the molten steel surface on which powder cannot be spread. This is called a dead angle. To remove this dead angle, precision machines must be used, but such use is difficult in the presence of scattered dust and molten steel. PG,5
SUMMARY OF THE INVENTION
The present invention solves the above problems by providing a powder feeder in continuous casting which comprises a powder container for storing the casting powder in the final stage, and a spreading feeder for spreading the casting powder on the molten steel surface in the mold. The invention is characterized in that the powder container is arranged higher than the work space of the mold, the spreading feeder is attached to a robot arm, and the spreading feeder and the discharge port of the powder container are connected through a flexible transfer path which can follow the movement of the robot arm.
In addition, a spreading conditions monitoring sensor is arranged on the robot arm.
The powder container for storing the final casting powder of the present invention refers to the second powder container in a configuration where the powder is transferred from a first powder storage container to a second powder container and spread on the mold from there. In a configuration where the powder is directly spread on the mold from a first powder storage container, the powder container for storing the final casting powder refers to the first container.
The robot arm of the present invention comprises a plurality of sections movably connected through joints. The movement of each section is automatically controllable.
The spreading feeder of the present invention can comprise a pneumatic transfer means or a mechanical transfer means such as a spring feeder. Also it is possible to make the spreading feeder itself movable by swinging.
The spreading conditions monitoring sen
REFERENCES:
patent: 4116367 (1978-09-01), Kataoka et al.
patent: 4312399 (1982-01-01), Shinji et al.
patent: 4632173 (1986-12-01), Kaneko et al.
Batten, Jr. J. Reed
Liner Kabouki Co., Ltd.
Mitsui & Co. Ltd.
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