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Патент USA US2116980

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May 10, 1938.
. Filed June 28, 1937
2 Sheets-Sheet l
À May 10, 1938.
F. H. N_AlsH
Filed June 28,Y l1957'
2 sheets-shew;
Patented May 10,- 1938
i 2,116,980
PATENT ori-*ica
\ AUToMAnc~scaAran Foa simu» METAL
ma' awash, Birmingham. man „signor u»
Steel Company, a corporation of
as, 1931, serai »16.150.141
comme." wl. so-ii ‘
i My invention `relates to an lautomatic >scraper
‘ for mills rolling strip stock.
‘ l
More particularly my invention is `applicable
Fig. lois an end‘view of atypical strip rolling
Í` mill showing Vmy improved automatic scraper
. control ,associated .with the mill power circuits
laid out in a conventional diagram'.
to mills of the class suitedv for the rolling of
narrow strip stock; s'uch ashoopstock, in `which _ l
the strip travels at a high speed‘in` its traverse
of the finishing‘mill pass.
s .
` The object of my invention is `to reduce to a
Fig..2 is a‘plan viewof the` mill and scraper
sectional view ‘showing `the .
Fig. 3 is a cross
scraper elements in operative position.
minimum the amount of ‘ilnished 4,stock in` each
Fig. 4 is a diagrammatic circuit layout for a
`ing rolls'at a speed equal to, or even in excess
`In the ‘embodiment of my invention illustrated,
piece rolled which gets by the scraper untreated load relay suitablelfor the control of the scraper. 10
numerals refer to similar
and is therefore unmarketable. It is customaryl . ` .Similar reference
-for hoop strip stock to travel through the iinish s parts throughout the drawings. `;
of, 1500 feet per minute,`or 25 or more feet per .I show a typical mill roll _stand `comprising a
“ second.
At such speeds it `will‘be obvious that .
housing 5, the usual‘bearlngs 6 and‘l‘wfor the
whatever time interval is permitted to `elapse ‘be-.s ` upper and lowerrolls 8 and 9, and adjusting
tween the moment that the Vmill rolls grip the` screwsl I0 >to set `the upper roll bearingsso as to
forward end of a strip of stockand the setting produce the `desired roll clearance. „ Suitable
` ‘of the scrapers to engage the stock, will repre- y
"guides Il receive the incoming stock and de
sent a loss. ‘Where it is attempted toset the Í liver it_ into the mill pass,.while corresponding 20
scraper by hand or stock actuated switch,; the ¿ guidesv `lilcarry the iinished stock away fromV the l
delay of _a fraction `of a second,` in >setting the s
scraper may mean many feet of untreated stock ` . I mount
i fast on the housing 5, adjacent
`that must be scraped, while iffthe _scraper is ` the stock guides . il, a stationary Ascraper frame
set in advanceof ‘the stock’s engagement be-` ì I3 comprising the spaced "scraper bars lil, I5 25
tween the‘rolls, the feed of stock will beï‘stópped, and I6. A‘sverticallymovable.scraper frame I1
i ‘necessitating release‘of the scraper andcausing ‘carries scraper bars i8 and I9 `wlilchdepend be
' low it and in their lowered operating position ñt
delay in operation and reduction oi output.
between and coact with, bars Il, l5 _and `I6 to
`The purpose of my present invention is-auto
matically to-apply the scraper cotemporaneously `bend the stock and effectively scrape it on both 30
with the engagement of the'forward end ‘of` the ksides,i i asl will ` appeari in" Fig.` 3. A frame 20,
strip stock between the mill rolls. `To' this end " also attached to thehousing 5, supports an up
the'scraper is set lclose as it conveniently‘may right cylinder 2l centrally' over the bar IL The
be to the mill rolls on their receiving side fand ‘ movable frame I1 has end guide extensions which
electro-magnetically controlled means are em `slide 'in the grooves 22 formed "in the vertical
ployed to set the scraper to its work responsive sides of the frame 20. The cylinder has its pls-`
to the increase of load coming on the mill when i ton connected centrally to the frame` i3 on its
it grips the stock. In other words, the increase `mili side and it is adapted to be operated by com- l
of power required'to drive the rolls when they` pressed ,air supplied 4from lany suitable source,
take hold of the strip will act automatically and such as the tank 23 from `whence'itilows through .40.
instantaneously to apply the scraper so that the pipe 24 to‘a four-way valve 25 controllingits
unscraped waste stock on each piece rolled is ñow to, and 4exhaust from, th'e‘ cylinder. This
`substantially limited in length to the distance be `‘valve may be ‘of’ any standard >four-way type .
tween the scraper and its associated'mill pass. ~ ‘andas it` formsno particular part of4 my present .
The discharge of the stock piece'from" the rolls H inventiomit will not be illustrated in detail. 45
l The valve body‘has an exhaust outlet 26 and
will likewise effect anautomatic resetting of the
scraper to open position so as to permit the im
air lines 21 and 28 leading ‘tothe opposite ends `
`of `the cylinder 22; 'I'he valve element in the
`My invention iurthercomprises the novel de `form shown is controlled by a lreciprocable
tails of construction and arrangements of parts plunger 29` connected. to a lever A30 pivoted at 50
which, intheir preferred embodiment only. are one end to the bracket 3l and at its other end
mediate rfeed of new stock into the mill.` l
illustrated in the accompanying drawings with . connected t_o_ the core 32 of the solenoid 33.
As shown, fthe core passes loosely through the
reference to which my invention is `more par
free end of the lever 30 and carries at-its‘ lower
ticularly described and claimed.`
‘ "
‘i end a spring seat 34 upon which rests a coiled
According to the drawings:--"
compression spring 36 that supports the lever 30.
'I‘he lever 30 is connected by a coil tension spring
36 to a bracket 31 on the valve body and thus
the free end of the lever is biased
against spring 35. Assuming -the
deenergized, the parts .will occupy
shown in Fig. 1 with the pressure
solenoid 33
the position
admitted to
the lower end of the cylinder through'fair- line
31, and the upper end of the cylinder open to
and 46 are connected. Thus a current fiow
greater than that required to drive the mill when
idling will instantly lift the switch arm 55 and
close the valve control secondary circuit ener
gizing the solenoid 33 and causing the air motor,
assisted by gravity, to thrust the movable scraper
frame I1 into quick engagement with the stock.
In like manner, the moment the mill rolls release
the stock, the load factor on the primary circuit
drops, the plunger 53 is'lowered, the switch 55 is 10
opened and the secondary circuit is broken,
the exhaust through air line 28 and valve outlet
26. The scraper will be in open position and the
mill rolls will be turning idle, as indicated -by the 1 whereupon spring 36 resets the -valve to the posi
arrows, ready for the reception of the strip stock tion shown in Fig. 1 and the air pressure lifts
to be rolled.
the scraper frame I1 so that the new stock is
The electric motor for driving the mill rolls is ` ready to be introduced into the mill.
omitted but a metering power circuit 40, 4|
therefor is shown comprising anammeter 42, a
voltV meter 43, and a current load relay 44.
This load relay, in the manner well understood
in this art, acts to open and close a 110 volt
valve control circuit comprising the leads 45 and
46, which include the solenoid 33 and also the
double safety switch 41 and the hand operated
control switch 48. 'I'he load relay -is of' such
25 character that the solenoid circuit is open when
the mill is idling but the moment the stock enters
the pass between the mill rolls more power will
be required in the primary or load responsive cir
cuit 40, 4I and such increased flow of current
30 will operate the load relay to close the secondary
or valve control circuit 45, l46 energizing the
solenoid 33, lifting the solenoid core 32 and rais
ing the valve lever 30, against the action of spring
36, to reverse the four-way valve 25 and admit
35 air through the line 26 into the upper end of the
cylinder 22 while exhausting air from the lower
end of the cylinder through the line 21 and the
`valve outlet-26.' The combined action of air and
gravity will thrust the movable~ scraper element
40 I1 quickly downward into its operating position,
shown in Fig. 3, and will hold it in this position
with its scraper >bars interleafed between the
blades of the stationary scraper' bars so as to
effectively scrape and clean the stock passing to
the mill pass. As soon as the stock leaves the
‘ mill rolls the current load factor in the primary
current will drop, causing the load relay to open
the secondary or valve control circuit, whereupon
the solenoid will be deenergized, and the spring
50 36 will reverse the four-way valve 25 to admit air
below the piston in cylinder 22 and exhaust air
from above the piston, so that the movable scraper
blade I1 is lifted to open the scraper and allow
the next stock to pass freely to the entering mill
55 guides Il.
The switches 41 and 45 are normally closed
when the apparatus is in operation and are not
open as shown in Fig. 1. The switch 48, a man
ually controlled switch of any suitable and con
venient type, is arranged so that the operator can
at will open the valve controlling circuit. Thus,
when the mill is starting up and the load factor
willbe high, it is necessary to hold switch 46 open
until the millattains idling speed, then it can be
closed and the current relay 44 will thereafter 25
automatically control it. Likewise, if anything
goes wrong during the rolling operation, the strip-‘
per can be immediately disengaged from the stock
by opening switch 46. Switch 41 is purely a
safety switch.
While I have shown my invention in. but one
form, it will’ be' obvious to those skilled in the art
that it is not so limited, but is susceptible to var
ious changes and modifications, without depart
ing from the spirit thereof, and I desire, there
fore, that only such limitations shall be placed
thereupon as areimposed by the prior art or as
are specliically set forth in the appended claims.
` What I claim as new and desire to secure by
Letters Patent, is:
1. The combination with a mill for rolling strip
stock of an automatic scraper mounted adjacent
to and on the receiving side of the mill,.an elec
trical power circuit for the mill drive comprising
a load relay, a secondary circuit controlled by 45
said load relay responsive to the presence or ab
sence of stock between the mill rolls, an electro
magnetically controlled valve means _responsive .
to said secondary circuit, and fluid pressure means
controlled by said valve means and adapted to
apply the scraper to strip stock entering the mill
pass and to set the scraper for admission of fresh
stock to the mill, and a load relay in the mill ‘
drive circuit adapted to control the secondary
' circuit and set the scraper in operating position
In Fig. 4 I have shown a conventional wiring as soon as the stock enters, and during its trav
diagram for the current load relay 44 as this erse of, the mill roll pass'.
may be of standard design which in various types
is available on the market.
As illustrated in' Fig. 4, the primary‘circuit
leads 40 and 4| are respectively connected to the
terminals 50 and 5| of therelay, these terminals
being in turn connected to the ends of a circuit
52 which includes coils 'surrounding a plunger 53.
the coils having tap leads to a connector block
54. so that the desired .tap values can be obtained
for setting the plunger to operate at the desired
predetermined load value. This load value is
70 such'as will result when the mill rolls bite into
the stock; and under such conditions the increased
ilow of current will lift the plunger and operate
the switch arm 55 to close the circuit 56, the sides
of' which are connected to the terminals 51 and 58,
75 to which respectively the control circuit leads 45
2. 'I‘he combination with a mill for rolling strip
stock, a scraper mounted close to the receiving
`side of the mill and comprising cooperating sta 60
tionary and movable elements, a ñuid pressure
motor to open and close the scraper elements,
a control valve for said motor, electro-magnetic
means to _operate said valve to reverse said motor..
an electric supply circuit for the mill drive, a
load relay responsive to the circuit flow insaid
circuit, and a secondary circuit including said
electro-magnetic means and controlled by said
load relay to reverse said motor when stock enters
and leaves the pass between the mill rolls.
3. A scraper means for a rolling mill. according
to claim 1, in which the electro-magnetically con
trolled valve means comprises a valve operating
lever, spring means normally holding the lever
in position to render the scraper inoperative, and 75
a solenoid adapted to move the lever and valve
against said spring to set the scraper in operative
engagement with the stock.
4. A scraper means for a rolling mill, according
to claim 2, in which the secondary circuit comprises a manually controlled switch operable to
open and close the scraper elements independ
ently of the operation of said load relay.`
5. The combination with a rolling mill having
10 an electrical power` circuitI carrying `current for
the drive of the mill rolls, a `scraper means adapt
ed to act on the stock in its passage to the `mill
6. The combination with a rolling mill having
an electrical power circuit carrying current for
the drive of the mill rolls, a scraper adapted to
act on the stock in its passage to the mill, an
electro-magnetically controlled means, auto
matically responsive to an abnormal current flow
in the mill power circuit responsive to the engage
ment of stock between the mill rolls, to cause the scraper to engage the stock as soon as it is grasped
by the rolling mill, said means comprising a relay
responsive to the current flow in the mill drive
power circuit, a relay operated switch means oper
and comprising separable‘elements operable to able responsive to a predetermined current ilow
engage and release the stock, electro-magnetically in said circuit, a secondary circuit controlled by 15
said switch and comprising an electro-magneti
15 controlled means to effect the engagement `and
disengagement of said scraper elements, andv cally operated valve, and a ñuid power motor con
means, automatically responsive to an` abnormal trolled by `said valve and adapted according to its
current flowin the mill power circuit responsive setting to cause the scraper to engage or release
to the engagement of stock between the mill rolls.
for effecting automatically engagement of the
scraper elements with the stock as soon as it is
grasped by the rolling mill rolls.
the stock.
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