close

Вход

Забыли?

вход по аккаунту

?

код для вставки
Nov. 12, 1946.
‘
_
‘
_W.ERN_ST
'
_27,410,869.
HYDRAULI C SYSTEM
“
Filed Nov. 12, 1942
INVENTOR
WALTER ‘ERNST _
BY
ATTQRNEY
'1 0 2,410,869
, Patented Nov. 12, 1946
UNITED STATES PATENT, ‘OFFICE
_,
2,410,869
HYDRAULIC‘ ‘SYSTEM :_ '
Walter. Ernst, Mount Gilead; Qhio, assignor ‘to
The Hydraulic Development Corp., Inc.,~Wil
'\
.
mington, Del., a corporation of Delaware
Application November 12., 1942, Serial No. 465,521
4 Claims. ' (or. 60-52)
1
_
2
-
Connected to the valve cylinder II ‘is. a conduit
l2 which leads to a conduit l3.~ The-conduit l3
> This invention relates to hydraulic systems
and, in particular, to hydraulic systems compris
ing a ?uid operable plungerand means for con-\
_ includes an adjustable choke l4 and has one end
connected to a four-way valve, generally des
trolling the speed of said plunger.
It is an object of this invention‘ to provide 5 ignited l5, while the other end'of the conduit
a hydraulic system including‘ a ?uid operable
43 leads to a conduit It. The conduit l6 com
prises an adjustable choke valve l'l- and is con
plunger, in which valve means is provided for
controlling the speed-of said plunger. ‘said valve ‘.nected, on one hand, with the interior of the
valve cylinder {Land on the other hand with
means being controlled in response to the travel
of said plunger so as to vary the speed thereof. 14) a vfluid reservoir or surge. tank 18;. The tank‘ I8
is mounted on flangesv IS on the cylinder i,
It is another object of the invention to pro-"
vide an open. hydraulic“ circuit including a ?uid
which latter is provided with a surge ,valve 20.
The surge valve 20 is adapted, in response to a
operable plunger, in which the speed of said
predetermined pressure in the lower portion of
plunger is controlled by throttle valves, at least
15 lthe cylinder 1, to open, to thereby establish ?uid
one of which iscontrolled by said plunger.
~connection between the upper portion of the ‘cyl
It is a further object of this invention to pro
-vide an open hydraulic circuit including a‘ I inder l and the tank l8. The surge valve 20 also
plunger and I?uid operable advancing and re
1 opens in response to a suction e?ect in the upper
tracting means for reciprocating said plunger, in
poftion of the ‘cylinder I. The surge valve 20
Which the retracting means is hydraulically .0011- ~30 does not form a part of the present invention.
nected with a plurality of throttle valves, one'of
and for a more detailed description thereof ref
which may be made ine?'ective in response to a
erence may be had to U. S. Patent _No. 2,193,248
predetermined travel of said plunger.
'
" to Ernst.
These and other objects and advantages of '
The‘ surge valve 20 is connected, by means of
the invention will appear more clearly from the' '25 a conduit 21 with a conduit 22 leading to the
following speci?cation in connection with the
lower portion of the cylinder l. The conduit 22
accompanying drawing illustrating,‘v by way of
example, a hydraulic system according to'the. in-H
also leads to the interior of the valve IS, in which
are reciprocably mounted the piston portions 23
vention.
and 24 of a valve member 25. The valve mem
'
'-
'
"
‘
In general. the system according to the nres- 3Q\ber 25 is provided with a handle 26 to allow man
ent invention comprises \a reciprocable plunger
u'al operation thereof. The lower end of the
having associated‘ therewith ?uid operable ad
valve member ,25 has adjustably mounted there
~.vancing and retracting ‘means for actuating said
on a coliar‘2'l‘ladapted to engage one end of, a
' plunger, andv a plurality of throttle valves
lever 28 which is shiftable about'a pivot 291. and
through which the ?uid’ expelled from the re‘ 35 comprises alever arm 30 adapted to be'engaged
‘tracting means, escapes during a part of the
by the press platen 4.
.
working stroke of said plunger.
\
.
The arrangement is such that when the platen
When the plunger, during its working'stroke,
4 approaches its retracted position, it engages
has reached a predetermined position,’ valve
the arm 30 and shifts the latter in anti-clock
means is actuated which makes one of said 40 wise direction in sucha manner that the lever
throttle valves ine?ective, thereby forcing the
arm 28 engages the collar 21 and thereby causes
?uid expelled from the retracting means through
the valve member 25 to move into the position
the remaining valve, with the result that the
shown in the drawing, in which position the
speed of the plunger is slowed down.
conduits 2| and 22 and the conduit 3|, leading
Referring now to the drawing in detail,-the 45 to the upper portion of the cylinder l, are closed
system shown therein comprises a cylinder I hav
off, while ?uid connection between any of the
ing reciprocably mounted therein a press ram 2
conduits 32-, 33 and-34 is interrupted. The con
including a double-acting piston 3. Connected
duit 34 communicates with the pressure side of
to the ram 2 is a platen 4 carrying a cam 5. The
cam 5 is adapted, at a predetermined point of 50 a ?uid $911113‘!v 35, which may, for instance be 9
variable delivery pump of the radial piston type
travel of the ram 2, to engage a roller 6 and to
or of the vane type, and may be provided with
shift the valve member ‘I, connected to said roller
servo-motor means 36 connected through a pilot
6, toward the left against a spring 8. The valve
line 31 with the conduit 34 for moving the pump
member ‘I has two piston portions 9 and In re
ciprocably mounted in vthe valve cylinder ll. 55 to substantiallyn- 'elivery position when a pre
2,410,869
-
4
3
determined pressure is established in the con
duit 34.‘
‘
~
The system according to the present inven
tion operates as follows:
It may be assumed that all parts occupy the
portion of the cylinder I, nor be introduced to
the upper portion of the cylinder I, so that the
ram 2 comes to a halt.
for a new cycle.
The system is now ready
In connection with the retraction stroke of the '
position shown in the drawing, and that it is
ram 2, it may be emphasized that the valve mem- now desired to perform a working stroke of the
ber ‘I, when temporarily actuated by the cam 5..
ram 2. To this end, the valve member 25 is
does not cause any change of operation, since
shifted into its lowermost position, in which ?uid
the supply of ?uid to and withdrawal of ?uid
connection is established between the conduits 3I 10 from the cylinder I during the retraction stroke
and 34, while the conduits 22 and 33 are in
of the ram 2 is in no way aifected by the throttle
hydraulic communication with each other.
valves I4 and I1 and the valve member ‘I.
If the pump 35 is in operation, it now delivers
It will be understood that I desire to compre- '
pressure ?uid through the conduits 34 and 3I
hend within my invention-such modi?cations as
into the upper portion of the cylinder I. Inas 15 come within the scope of the claims.
, much as now ?uid connection is established be
Having thus fully described my invention, what
tween the conduits 22 and 33, the ram 2 moves
I claim as new and desire to secure by Letters
downwardly by gravity and the ?uid expelled from
Patent is:
the lower portion of the cylinder 1 passes through '
' 1. In a hydraulic system, reciprocable plunger
conduits 22 and 33, in part through the choke I4 20 means, ?uid operable advancing and retract
and in part through the conduit I2, valve cylinder
I0 and choke‘ I1 into the tank I8. The ?uid de
livered by the pump 35 into the upper portion of
the cylinder I, is supplemented by ?uid passing
from the tank I8 into the upper portion of the
cylinder I through surge valve 20s p
ing means associated with ‘said plunger means,
a pump for supplying actuating ?uid to said ad
vancing and retracting means for reciprocating
said plunger means, inlet conduit means hydrau
lically connecting said pump with said advanc
ing means, exhaust conduit means hydraulically
connecting said retracting means with exhaust,
When the platen 4 approaches a predeter
mined position, the cam 5 engages the roller 6
a valve member in said inlet and exhaust con
and shifts the valve member ‘I toward the left so
duit means controlling the supply of ?uid to, and
as to interrupt ?uid connection between the con 30 the exhaust 0f ?uid-from, said advancing and
duit I2 and I6‘ through the valve cylinder II.
retracting means, a ?rst adjustable choke means
Consequently, all the ?uid expelled from the lower
in said exhaust conduit, a second adjustable
portion of the cylinder I must now pass through choke means arranged in parallel with said ?rst
the throttle valve I4. Inasmuch as, in the mean
choke means by conduit means establishing ?uid
time, no change in the setting of the valve I4 has
been effected, the same quantity of ?uid, pre
viously passing through both the chokes I4 and
I1, must now pass through the throttle valve
-- I4, thereby causing a reduction in the speed of
the ram 2.
,
While the ram 2 continues its downward move
ment, the cam 5 will, in response to a predeter
mined travel of the ram 2, again disengage the
roller 6, so that the spring 8 ,will return the valve
member ‘I to the position shown in the drawing.
This will re-establish ?uid connection between the
conduits I2 and I6 through the valve cylinder I I,
so that a part of the ?uid expelled from the lower
portion of the cylinderI may again pass through
connection between the inlets of ' said choke
means, valve means in said last mentioned con
duit means and automatically operated in re
sponse to a predetermined advancing movement
of said plunger to interrupt'said ?uid connec
40 tion and also automatically operated in response
to a predetermined additional advancing move
ment- of said plunger for re-establishing said ?uid
connection, and said valve member being oper
ated in response to a predetermined retracting
movement of ‘said plunger to cut off said inlet
and exhaust conduit means.
2. In a hydraulic system, a downward acting
plunger'having advancing and retracting means,
a ?uid source, a valve member movable into a
the throttle valve I‘I.
As a result thereof, the ram 50 ?rst position to connect said source with said
2 increases its speed.
.
advancing means while simultaneously connect
When the ram 2 has reached the end of its
ing said retracting means with a ?rst exhaust
working stroke, the valve member 25 is shifted
conduit or, into a second position to connect said
into its uppermost position, in which ?uid con
source with said retracting means while connect
nection is established between the conduits v3:‘I
ing said advancing means with a second exhaust
and 22, while the conduit 3| is in ?uid communi
conduit or, into a third position to interrupt
cation with the conduit 32.. Consequently, pres
?uid communication of said source with said ad- '
sure ?uid delivered by the pump 35passes through
vancing and said retracting means, paralleled
the conduits 34 and 22 to the lower portion of the
choke valves in said ?rst exhaust conduit for
cylinder I and moves the ram 2 upwardly, while
restricting the exhaust of ?uid from said retract
?uid expelled from the upper portion of the 60 ing means, normally open valve means between
cylinder I escapes through the conduits 3I and
said valve member and one of said choke valves,
32,_ and through the conduit I6 into the tank I8.
means automatically responsive to the movement
Inasmuch as, at this stage, no ?uid has to pass
of said plunger during its advancing movement
through the throttle valves I4 and I ‘I, the re
65 for first closing and thereafter opening said valve
traction stroke of the ram 2 is e?ected at rela
means, for temporarily slowing down the rate
tively high speed.
'
of advancing movement of said plunger, and
When the ram 2 has reached the end of its re
means operated by said plunger at the end of its
traction stroke, it again occupies the position
retracting movement for moving said valve mem
shown in the drawing, in which the lever arm 30 70 ber into said third position.
has been’ shifted by the platen 4 into the position
3. In a hydraulic system, a downward acting
shown in the drawing, in which the lever arm 28
plunger having advancing and retracting means,
_ has moved the valve member 25 into its inter
mediate or neutral position, as shown in the draw
a ?uid source, a'v valve member movable into a
?rst position to connect said source with said
ing. No ?uid can now escape from the lower 75 advancing means while simultaneously connect
l
2,410,869
6
ing said retracting means with a ?rst exhaust
conduit or, into a. second position to connect said
source with said retracting means while connect
ing said advancing means with a second exhaust
conduit or, into a third position/to interrupt ?uid
communication of said source with said advanc
ins and said retracting means, paralleled choke
member in the‘ connection from said source to
said means movable into a ?rst position to con
nect said source with said advancing means while
simultaneously connecting said retracting means
with an exhaust conduit or, into a second posi
tion to connect said source with said retracting
means while freely exhausting said advancing
means or, into a third position to interrupt fluid
communication of said source with said means,
means, means automatically operated by said 10 paralleled ?ow restricting means in said conduit
valves in said ?rst exhaust conduit for restrict
ing the exhaust of ?uid‘ from said retracting
plunger during the advancing movement thereof
for restricting the exhaust of ?uid from said re
tracting means, means automatically operated
by said plunger during its advancing movement
for interrupting the ?ow of fluid through one of
and thereafter again establishing said. ?ow for
temporarily slowing down the advancing speed 15 said ?ow restricting means, means automatically
of said plunger, and means adapted for operation
operated by a further advancing movement of
.said plunger for again establishing fluid flow
by said plunger at the end of the retracting
through said one ?ow restricting means, and
movement thereof for moving said valve member
‘means automatically operated by said plunger
into its third position.
during the retracting movement thereof for mov
4. In a hydraulic system, a, reciprocaiole plung
ing said valve member into its third position.
er having advancing and retracting means, a
for first interrupting ?ow of ?uid from said re
tracting means through one of said choke valves
fluid source for supplying said means, a valve .
~
-
WALTER ERNST.
Документ
Категория
Без категории
Просмотров
0
Размер файла
417 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа