Method for conveying container, device for conveying container, and method for conveying ladle

Patent metadata

Field	Value
Publication number	US-11331718-B2
Application number	US-201716488412-A
Country	US
Kind code	B2
Filing date	Dec 11, 2017
Priority date	Feb 27, 2017
Publication date	May 17, 2022
Grant date	May 17, 2022

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.

First claim

What is claimed is:

1. 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≤(t 0 /4)
v ( t )= a·t 2   [Formula 1]

Formula 2 when (t 0 /4)≤t≤(3t 0 /4)

v
⁡

(
t
)

=

-
a

·

[

(

t
-

t
0

2

)

2

-

t
0
2

8

]

[

Formula
⁢

⁢
2

]

Formula 3 when (3t 0 /4)≤t≤(t 0 )
v ( t )= a ·( t−t 0 ) 2   [Formula 3]

wherein ‘t 0 ’ 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.

2. The method for conveying a container according to claim 1 , wherein:
the conveyance velocity v(t) of the container, which is a function of time t, is also represented by:
Formula 4 when 0≤t≤(t 1 /4)
v ( t )= b·t 2   [Formula 4]

Formula 5 when (t 1 /4)≤t≤(t 1 /2)

v
⁡

(
t
)

=

-
b

·

[

(

t
-

t
1

2

)

2

-

t
1
2

8

]

[

Formula
⁢

⁢
5

]

Formula 6 when (t 1 /2)≤t≤(t 1 /2)+t 2

v
⁡

(
t
)

=

1
8

⁢

b
·

t
1
2

[

Formula
⁢

⁢
6

]

Formula 7 when (t 1 /2)+t 2 ≤t≤(3t 1 /4)+t 2

v
⁡

(
t
)

=

-
b

·

[

(

t
-

t
1

2

-

t
2

Assignees

• Hitachi Metals Ltd

Inventors

• Harada Takuya

Classifications

• B22D41/12 Primary

  Travelling ladles or similar containers; Cars for ladles (casting cranes B66C) · CPC title

• B22D41/06 Primary

  Equipment for tilting · CPC title

• B65G43/00

  Control devices, e.g. for safety, warning or fault-correcting · CPC title

• B65G2813/023

  Load-carriers · CPC title

• B65B57/00

  Automatic control, checking, warning, or safety devices (registering wrapping or container-forming material fed from rolls B65B41/18) · CPC title