US Pat. No. 10,219,331

APPARATUS AND METHOD TO ELECTRICALLY POWER AN ELECTRIC ARC FURNACE

DANIELI AUTOMATION SPA, ...

1. Electric power supply apparatus for an electric arc furnace comprising at least one electrode, said electric power supply apparatus being electrically connectable to a power network to supply to said electrode electric energy to generate an electric arc to melt a metal mass, said power network being a three phase electric network with three phases, each phase providing a network current, said network current being alternate current (AC), said apparatus comprising an electric regulation unit interposed between and electrically connected to the power network and to the electrode and configured to regulate at least one of a current or a voltage for powering said electrode, wherein said apparatus comprises at least one detection device interposed between the electrode and said electric regulation unit and configured to detect said at least one of the current or the voltage, a positioning device configured to move the at least one electrode nearer to/away from the metal mass to be melted and a controller electrically connected to said electric regulation unit, to said power network, and to said positioning device, said controller being configured to control said electric regulation unit and said positioning device, wherein said electric regulation unit comprises a converter device configured to convert the network current into the electric energy to generate the electric arc at said electrode, wherein said converter device includes a plurality of modules electrically connected in parallel with each other and each of said modules is electrically connected to all of said three phases of the power network, wherein each of said modules comprises three phase sub-modules, wherein each of said three phase sub-modules comprises (i) a straightening circuit configured to rectify and regulate the network current to generate a straightened current, (ii) an intermediate circuit configured to store direct current (DC) energy from the straightened current, and (iii) an inverter circuit configured to invert the straightened current from the intermediate circuit by regulating a frequency and an amplitude of a fundamental harmonic of another alternating current providing the energy to the electrode, wherein said apparatus comprises a Pulse Width Modulation regulator configured to regulate the switching frequency of said inverter circuits and their band occupation.

US Pat. No. 9,201,087

DEVICE FOR MEASURING THE SPEED OF PRODUCTS IN MOVEMENT, IN PARTICULAR METAL ROLLED PRODUCTS IN A ROLLING LINE, AND RELATIVE METHOD

DANIELI AUTOMATION SPA, ...

1. A device for measuring speed of moving oblong products in movement along a determinate direction of feed (F) and emitting
radiations, comprising:
at least two sensors for radiations, suitable to detect overall energy emitted by the moving oblong product, disposed reciprocally
at a close distance and each able to define a respective optical observation window, disposed at a known and pre-arranged
distance from each other, each window configured to always cover an image of a determinate portion of advancing said product
equal to a width of the relative window, irrespective of the movements made by said portion transversely to the direction
of feed, each of said windows having an oblong rectangular shape,

with a bigger side, or length, transverse to, and width parallel to, the direction of feed (F) of the oblong product to be
measured, wherein a ratio between length and width of each window is between 3:1 and 20:1,

wherein each window has the bigger side, or length, oriented in a direction orthogonal to the direction of feed (F) of the
moving oblong product and of a size much larger than a transverse size of the moving oblong product, wherein a ratio between
the length of each window and the transverse size of the moving oblong product is between 12:1 and 3:1;

said sensors for observing said portion of product presented, on each occasion, in correspondence with the associated windows
consecutively along the direction of feed (F), said sensors also for continuously measuring intensity of the radiation associated
with the overall energy emitted by the moving product and emitted by the portion of product in correspondence with the windows;

an electronic processing unit able to determine, by processing electric signals associated with the intensity of radiation
detected and arriving from the two sensors, using mathematical algorithms based on correlation principle, time taken by the
portion of product to transit from a first window to a second, successive window, and then, on the distance between said two
windows, to calculate the speed of the oblong product.

US Pat. No. 9,404,786

DEVICE TO DETECT THE LEVEL OF LIQUID METAL IN A CASTING APPARATUS AND RELATIVE METHOD

DANIELI AUTOMATION SPA, ...

11. A method to detect the level of liquid metal in a casting apparatus comprising at least a crystallizer in which said liquid
metal (M) is cast, wherein said crystallizer has lateral walls, or is of a tubular shape, and comprises an upper edge which,
with respect to an inner corner, defines an open top through which the liquid metal (M) to be cast is discharged, wherein
the method comprises generating a variable magnetic field having field lines (L) which are at least partly propagated in said
molten metal (M) so as to induce induced currents therein, said variable magnetic field being generated by means of at least
a means for the generation and detection of a variable magnetic field, disposed in a box-like structure which is associated
in correspondence with the upper end of said crystallizer and which extends, together with said magnetic field generation
and detection means, along the upper edge of said crystallizer for at least a substantial part of its perimeter, wherein at
least part of said generation and detection means protrudes with respect to the inner corner of said upper edge so as to directly
face the metal liquid (M) present inside the crystallizer; and
detecting a signal of a reaction magnetic field generated by said induced currents in order to supply the signal to a command
and control unit which processes said signal and determines the level of the liquid metal (M) present in the crystallizer.

US Pat. No. 9,610,623

METHOD AND DEVICE TO CONTROL THE SECTION SIZES OF A ROLLED PRODUCT

DANIELI AUTOMATION SPA, ...

1. A method to control section sizes of a rolled product in a segment of a rolling line, between at least two rolling stands
each provided with its own drive members, in which between said two rolling stands a characteristic size of said rolled product
is detected, and a control unit compares said characteristic size of the rolled product with a reference size, to which an
optimal drawing condition corresponds, and acts on said drive members in order to hold the rolled product in said optimal
drawing condition, wherein the method comprises:
a first step of determining said reference size wherein said first step includes:
i) a first sub-step in which, during rolling, said control unit detects at least an electric quantity of at least one of said
drive members and determines an action on the latter in order to make said electric quantity assume a determinate reference
value to which said optimal drawing condition corresponds;

ii) a second sub-step in which, when said electric quantity substantially assumes said reference value, a size detector interposed
between said two rolling stands detects an instantaneous value of said characteristic size; and

iii) a third sub-step in which said instantaneous value is considered as a reference size;
a subsequent second step in which the control unit compares the characteristic size of the rolled product in transit, as detected
by said detector, with the reference size; and

a third step in which, if a deviation is detected between the characteristic size measured and the reference size, an action
is carried out on at least one of said drive members in order to return the characteristic size of the rolled product to said
reference size,

wherein the detection of said characteristic size includes correlating detections of a detector to detect a speed of the rolled
product disposed between said two rolling stands and a mass flow meter to measure said rolled product disposed in the segment
subject to control.