Method for conveying container, device for conveying container, and method for conveying ladle
AssigneeHitachi Metals, Ltd.
InventorTakuya Harada
Life of this patent
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Abstract
A method for calculating a conveyance velocity at which oscillation of a liquid surface is suppressed in conveying a container in which a liquid is accommodated, e.g., a ladle in which molten metal is accommodated. In a graph of conveyance velocity versus conveyance time, an upwardly convex parabola and a downwardly convex parabola having vertical symmetry are prepared in advance, the downwardly convex parabola and the upwardly convex parabola are smoothly connected to form an acceleration curve, the upwardly convex parabola and the downwardly convex parabola are smoothly connected to form a deceleration curve, and the conveyance velocity is obtained from the acceleration curve and the deceleration curve smoothly connected where the slope thereof is zero.
Claims8
A method for conveying a container, comprising:
- starting a conveyance by accelerating the container containing a liquid in a horizontal direction;
- and
- decelerating the container to complete the conveyance, wherein
- a conveyance velocity v(t) of the container, which is a function of time t, is represented by:
- Formula 1 when 0≤t≤(t0/4)
- v(t)=a·t2 [Formula 1]
- Formula 2 when (t0/4)≤t≤(3t0/4)
- v
-
- (
- t
- )
- =
- -
- a
- ·
- [
- (
- t
- -
- t
- 0
- 2
- )
- 2
- -
- t
- 0
- 2
- 8
- ]
- [
- Formula
-
-
- 2
- ]
- Formula 3 when (3t0/4)≤t≤(t0)
- v(t)=a·(t−t0)2 [Formula 3]
- wherein ‘t0’ represents a time for conveying the container and ‘a’ represents a constant, and the method further comprises determining the conveyance velocity v(t) of the container by using Formulae 1 to 3, and driving a motor that rotates a plurality of wheels of a trolley on which the container is placed and conveying the container in accordance with the determined conveyance velocity v(t) such that liquid surface oscillations after conveying the container are within a tolerable range.
A conveyor control device for conveying a container, which starts conveying by accelerating the container containing a liquid in a horizontal direction and completes the conveyance after deceleration, the conveyor control device comprising:
- a computer, wherein
- the computer stores a conveyance time t0 of the container, a constant a, a maximum value of a rate of change of acceleration of the container αmax at which liquid surface oscillations after conveying the container are suppressed within a tolerable range;
- the computer also stores a conveyance velocity of the container v(t), which is a function of time t as:
- Formula 1 when 0≤t≤(t0/4)
- v(t)=a·t2 [Formula 1]
- Formula 2 when (t0/4)≤t≤(3t0/4)
- v
-
- (
- t
- )
- =
- -
- a
- ·
- [
- (
- t
- -
- t
- 0
- 2
- )
- 2
- -
- t
- 0
- 2
- 8
- ]
- [
- Formula
-
-
- 2
- ]
- Formula 3 when (3t0/4)≤t≤(t0)
- v(t)=a·(t−t0)2 [Formula 3]
- the computer is programmed to calculate the constant a from the stored rate of change of acceleration αmax and determine the conveyance velocity v(t) of the container by using Formulae 1 to 3;
- and
- the computer is programmed to drive a motor that rotates a plurality of wheels of a trolley on which the container is placed and convey the container in accordance with the determined conveyance velocity v(t) such that the liquid surface oscillations after conveying the container are within the tolerable range.
Dependencies are inferred from the claim text.