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Патент USA US3029032

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Aprll 10, 1962
c. HORVATH ET AL
1
APPARATUS FOR DETERMINING THE RATIO BETWEEN
TWO D.C. POWER SOURCES
3,029,022
Filed March 3, 1959
SERVO-
\
AMPLIFIER Q"
30
_ ____ __
INVENTORS:
F 1 E__Z
CHARLES HORVATH a
ADAM F. LUKASIK
B,
ATTORNEY
United States Patent‘ 0 "
t"
3,029,022
"
ICC ~.
Patented Apr. 10, 1962
2
1
3,029,022
_
'
APPARATUS FOR DETERMINING THE RATIO
BETWEEN TWO D.C. POWER SOURCES
Charles Horvath, East Chicago, and Adam F.‘ Lukasik,
‘Gary, ImL, assignors to United States Steel Corpora
tion, a corporation of New Jersey
‘ Filed Mar. 3, 1959, Ser. No. 796,806
6 Claims. v(Cl. 235-1035) I
This invention relates to apparatus for determining the
ratio between two DC. power sources and more particu
larly. for determining the extension of. strip being rolled.
Variousl'types of instruments have been provided for
versely proportional to the diameter of the rolls driving
the. generators adjacent the resistors. In other words, 1
diameter of roll'14_value of resistor 24
diameter of roll 16_va1ue oi resistor 22
'However,; this relationship is .not exact since ‘any slight
diiferences in the characteristics of tachometer generators
At this time, volt
7 18 and 20 are also compensated for.
ageEl will equal voltage E2 with the null point occurring
at the end, of slide. wire 26 connected to resistor‘ 24. When
extension occurs in the strip, voltage is supplied to servo
ampli?er 28 thus causing motor 30 to move arm 26A to
a position where electrical balance occurs along slide wire
measuring tension such as shown in Rendel Patent ,No.
26.
At the same time, motor 30 moves arm 32A to
have some disadvantages.
calibration resistors 22 and 24 arev normally kept at their
adjusted values. The apparatus may be checked from
2,447,208, dated August 17, 1948, and Reed Patent No. 15 indicate percentage of extension on gage 32. The gage
32 can be calibrated in any suitable manner such as by
2,525,182, dated. October 10, 1950. 'While certain of
calculation or by calibrating from known extension. After
these instruments have been used satisfactorily they do
Apparatus such as shown in
the Reed‘ patent has the disadvantage that it will not op
erate satisfactory unless the generators have identical
characteristics. This is dif?cult to obtain, especially in
standard generators; Another disadvantage of apparatus
time to time'by passing a strip thercthrough without any
extension. If adjustment is necessaryresistor 22 will
normally be adjusted with resistor 24 remaining in its
commonly used at present is'that the apparatus does not, I
?xed position.
start functioning‘accurately until after a substantial length
v In the embodiment'of our invention shown in FIGURE
' 7 Another object is to provide inexpensive apparatus
to resistor 22’ is made to read as zero to 100% and the
.
,
‘
,
v
_
of the strip has passed through the mill. Therefore, the 25 2, sensing devices 34. and 36‘ apply voltages E3 and E4
to the percentage vmeter with the polarities as shown.
gage reading for this portion of strip is not correct. Varia
Voltage E3 is proportional to the‘energy consumed by
tion in thediameter of the rolls driven by the strip also
the machine and voltage E4 is proportional to the energy
is a source of error in obtaining percent elongation.
delivered in performing work. When the minimum e?i
It is therefore an object of our invention to provide
ciency percent to be measured full scale has been deter
apparatus for accurately determining a ratio between two
mined the ratio of the resistance values of slide wire'26'
direct current sources.
.
total resistance of slide wire 26’ and resistor 24’ is made
equal to- the resistance of resistor 22'. ' At 100% effi
the length of a strip being rolled.
These and other objects will be more apparent after 35 ciency the slide wire arm 26A’ will stop at the end of
the slide wire connected to servo-ampli?er 28'. For
referring to the following speci?cation and attached draw
ef?ciencies of less than 100% ‘the servo-ampli?er 28' will
ings, in which:
‘
I
rwhich will measure elongation accurately over most of
FIGURE 1 is a schematic view of our invention as in
corporated in an extensometer on a temper rolling mill;
apply a torque to motor 20' to move the arm 26A’ to an '
vintermediate position along the‘length of slide wire 26’.
40 Arm 38A of meter 38 is connected to motor 30’ so as
to indicate percent ef?ciency. The meter of FIGURE 1
FIGURE 2 is a schematic view showing our apparatus "
differs from that of FIGURE 2 only in the calibration
as applied in measuring the e?iciency of a machine '
of scales 32 and 33 and. in the proportions of the resis
Referring more particularly to FIGURE 1, the‘ refer- '
and
tance values of the resistors and slide wire.
ence numeral 2 indicates an uncoiler fromv which the
While two embodiments vof our invention have been
strip S is~uncoiled. The uncoiled strip; passes over an 45
‘shown and described it will bev apparent that other adapta
idler or billy roll 4 into the work rolls 6 of a temper roll
ing mill which is provided with the usual back up rolls
8. After passing through the work rolls 6¢the strip S
passes over billy roll 10 and is coiled on the coiler 12.
Rolls 14 and 16 bear upon the strip S at rolls 4 and 10,
respectively. Roll 14 is mechanically connected to drive
a tachometer‘ generator 18 and roll 16 is mechanically,
connected to drive a tachometer generator 20. The gen
tions and. modi?cations may be made Without departing
from the scope of the following claims.v
We claim:
'
.
'
‘
.
V
1. An extensometer for determining the ‘elongation of
strip passing through a reducing machine which com
prises‘ a roll driven at a speed proportional to entering
strip‘ speed, a second roll driven at a speed proportional
to exit strip speed, a ?rst D.C. generator driven by said
erators are of the same type with their characteristics
‘being as closely matched as is usual in standard equip 55 ?rst roll, a second D.C. generator driven by said second
roll, an electrical connection between the negative terminal
ment. The negative terminal of generator 18 is connected
of the ?rst generator and the positive terminal of the
to the positive terminal of generator 20 and the positive
second generator, an electrical connection between the
terminal of generator 18 is connected to the negative
positive terminal of the ?rst generator and the negative
terminal of generator 20. Variable resistors 22 and 24
are provided in the last named connection. A slide wire 60 terminal of the second generator, a slidewire having an
26 having an arm 26A is connected in series with a servo
ampli?er 28 across the ?rst two connections. The arm
adjustable arm, a motor connected to move said arm,
one of said electrical connections including a ?rst resistor,
said arm and a second'resistor in series, at least one of said '
26A is driven by a motor 30‘ which is also connected to
resistors being adjustable, a third electrical connection
arm 32A of gage 32. A torque is applied to the motor
65 between said ?rst and second electrical connections in
30 by means of servo-ampli?er 28.
cluding said slidewire and a servo-ampli?er connected
The operation of our device is as follows:
in series, and means connecting said servo-ampli?er to said
Strip S is passed between the rolls 4 and 14 and 10‘ and
motor, one of said resistors being on one side of said
16 without any reduction in gage and the resistors‘ 22 and
third electrical connection and the other being on the
24 are adjusted so that the arm 26A is at position-“0”
and the ratio between the values of the resistors are in 70 other side of said third electrical connection.
3,029,022
3
4‘
2. An extensometer for determining the elongation of
‘
’
'
v
of‘ the second generator, at slidewire having an adjustable
strip passing through a reducing machine which com
prises a roll driven at a speed proportional to entering
arm, a motor connected to move said arm, one of said
electrical connections including a ?rst adjustable resistor,
said arm, and a second adjustable resistor in series, a
third electrical connection between said ?rst and second
strip speed, a second roll driven at a speed proportional
to exit strip speed, a ?rst D.C. generator driven by said
?rst roll, a second DC. generator driven by said second
ro11,‘an electrical connection between the negative ter
minal of the ?rst generator and the, positive terminal of
electrical connections including said slidewire and a servo
ampli?er connected in series, and means connecting said
servo-ampli?er to said motor, one of said adjustable re
sistors being on one side of said third electrical connec
tion and the other being on the other side of said'third
the second generator, an electrical connection between the
positive terminal of the ?rst generator and the negative.
terminalof the second generator, a slidewire having an
electrical connection, the adjusted ratio between the values
of said electrical connections including a ?rst resistor, said
of said resistors being inversely proportional to the diam
eters of the rolls driving the generators adjacent said. re~
arm and asecond resistor in series, at least one of said
sistors.
adjustable arm, a motor connected to move said arm, one
‘
5. Apparatus for determining the ratio between two
resistors being adjustable, a third electrical connection 15
DC. power sources comprising an electrical connection
between said ?rst and second electrical connections‘in
between the negative teminal of the ?rst power source and
eluding said slidewire and a servo-ampli?er connected in
the positive terminal of the second power source‘, an elec
series, and means connecting said servo-ampli?er, to said
trical connection between the positive terminal of the ?rst
motor, one of said resistors being on one side of said third
electrical connection and the other being on the other 20 power source and the negative terminal of the second
power source, a slidewire having an adjustable arm, a
side of said third electrical connection, the adjusted ratio
motor connected to move said arm, one of said electrical
between the values of said resistors being inversely pro
connections including a ?rst resistor, said arm and a sec
portional to the diameters of the rolls driving the gen
ond resistor in series, at least one of said resistors being
erators adjacent said resistors.
I
3. An extensorneter for determining the elongation of 25 adjustable, a third. electrical connection between said ?rst
and second electrical connections including said slidewire
strip passing through a reducing machine which comprises
and a servo-ampli?er connected in series, and means con
a roll driven at a speed proportional to entering strip
necting said servo-ampli?er to said motor, one of said
speed, a second roll driven at a speed proportional to exit
strip speed, a ?rst D.C. generator driven by said ?rst roll,
resistors being on one side of said third electrical con
a second D.C. generator driven‘ by said second roll, an 30 nection and the other being on the other side of said third
electrical connection.
‘
electrical connection between the‘ negative terminal of the
6. Apparatus for determining the ratio between two
?rst generator and the positive terminal of the second
DC. power sources comprising an electrical connection
generator, an electrical connection between the positive
between the negative terminal of the ?rst power source
terminal of the ?rst generator and the negative terminal
of theysecond generator, a slidewire having an adjustable 35 and the positive terminal of the second power source, an ,
electrical connection between the positive terminal of the
arm, a motor connected to move said arm, one of said
?rst power source and the negative terminal of the sec
electrical connections including a ?rst adjustable resistor,
ond power source, a slidewire having an adjustable. arm, a’
motor connected to move said arm, one of said electrical
said arm, and'a second adjustable resistor in series, a
third electrical connection between said ?rst and second
electrical connections including said slidewire and a servo 40 connections including a ?rst adjustable resistor, said arm,
and a second adjustable resistor in series, a third elec
arnpli?er connected in series, and means connecting said
trical connection between said ?rst and second electrical
connections including said slidewire and a servo-ampli?er
servo-ampli?er to said motor, one of said adjustable re
sistors being on one side of said ‘third electrical connec
connected in series, and means connecting said servo
tion and the other being on the other side of said third
electrical connection.
'
4-. 'An extensometer for determining the elongation of
45 arnpli?er to said motor, one of said adjustable resistors
strip passing through a reducing machine which comprises
being on one side of said third electrical connection and
the other being on the other side of said third electrical
a roll driven at a speed proportional to entering strip ,
connection.
, '
speed, a second roll driven at a speed proportional to exit
strip speed, a ?rst D.C. generator driven by said ?rst roll, 50
a second D.C. generator driven by said second roll, an
electrical connection between the negative terminal of the
?rst generator and the positive terminal of the second
‘generator, an electrical connection between the positive
terminal of the ?rst generator and the negative terminal 55
References Cited in the tile of this patent
UNITED STATES PATENTS
2,525,182
Reed _'______________ _;_ Oct. 10, 1950
2,673,030
‘Isserstedt ___-_ _______ __'_ Mar. 23, 1954
2,829,828
Hollenbach ________ .._.'__. Apr. 8, 1958
2,913,270
Golding _____________ .._ Dec. 212, ‘1959
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