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Патент USA US3054322

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Sept. 18, 1962
R. M. STIKELEATHER
3,054,313
MACHINES FOR REMOVING F INS FROM SPIRALLY
FINNED HEAT EXCHANGE TUBES
Filed Dec. 25, 1958
5 Sheets-Sheet 1
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Sept. 18, 1962
R. M. STIKELEATHER
FINNED HEAT EXCHANGE TUBES
MACHINES FOR REMOVING FINS FROM SPIRALLY
Filed D90. 23, 1958
3,054,313
5 Sheets-Sheet 2
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12209228024.
Sept. 18, 1962
R. M. STIKELEATHER
3,054,313 '
MACHINES FOR REMOVING FINS FROM SPIRALLY
FINNED HEAT EXCHANGE TUBES
Filed Dec. 23, 1958
5 Sheets-Sheet 3
Sept. 18, 1962
. M. STIKELEATHER
3,054,313
MACHINES FOR REMOVING FINS FROM SPIRALLY
FINNED HEAT EXCHANGE TUBES
Filed Dec. 23, 1958
5 Sheets-Sheet 4
Sept. 18, 1962
,
R. M. STIKELEATHER
MACHINES FOR REMOVING F INS FROM SPIRALLY
FINNED HEAT EXCHANGE TUBES
Filed Dec. ‘2st 1958
3,054,313
5 Sheets-Sheet 5
3,954,313
Patented Sept. 18, 1962
2
3,054,313
MACHINES FOR REMOVING FINS FROM SPI
RALLY FINNED HEAT EXCHANGE TUBES
Robert M. Stilteleather, Holbroolt, Mass, assignor to Aero
?n Corporation, Syracuse, N.Y., a corporation of New
Jersey
Filed Dec. 23, 1958, Ser. No. 782,506
5 Claims. (Cl. 82—-40)
the ?nning machine 10. An air cylinder 16 attached
to the plate 12 has a half-nut 17 on the upper end of its
piston rod, the half-nut being adapted to be moved
against the threaded portion of the shaft 13 for causing
the plate 12 to move in the direction of longitudinal
movement of the ?nned tubing advancing from the ?n
ning machine.
A gear box 20 is driven from the shaft 13 by ‘belt 21
This invention relates to the manufacture of ?nned 10 and pulleys 22, and rotates through a slippable clutch 24,
a cam cylinder 26 which has cams S1, S2, S3, S4, S5, S6
tubing, and relates more particularly to machines for
and S7 which contact cam followers on valves V1, V2,
preparing cut-o?i lengths of ?nned tubing for assembly
V3, V4, V5, V6 and V7 respectively, which are connect
in heat exchangers.
This application is a continuation-in-part of my co
ed between a source of compressed air which is not
tion, for receiving a length of ?nned tubing as it is cut
oif, and preparing it for assembly in a heat exchanger
to which one end of chain 31 is attached, the other end
of the chain being free. The chain is meshed with a
sprocket on the cam cylinder 26. When the plate has
moved a predetermined distance forwardly, the valve
V12 is opened to cause the chain to be moved by the
piston ‘rod 63 to rotate the cylinder 26 back-wardly to
restore it to its original position.
An electric motor 33 is attached to the plate 12, and
pending application, Serial No. 560,682 which Was ?led 15 shown, and air cylinders C1, C2, C3, C4, C5, C6 and C7
respectively. The cylinders C1-C7 operate tongs T1-T7
on January 21, 1956, and which will issue as Patent No.
respectively, which close around the ?nned tube when
2,866,257 on December 30, 1958. In said application,
its advancing end leaves each tong.
there is disclosed a machine for cutting off predeter
As the plate 12 moves forwardly, a pivoted lug which
mined lengths of rotating ?nned tubing as it emerges from
a ?nning machine. The present invention provides a 20 it carries, opens valve V12 which admits compressed air
into a cylinder 32 (FIG. 3) which has a piston rod 63
machine synchronized with the machine of said applica~
by removing the ?ns at the ends of the tube, and inter
mediate its ends to provide clearance for tube supports;
by removing burrs at one end of the tube, and by spin
ning the other end of the tube to close it.
An object of this invention is to prepare lengths of
?nned tubes for assembly in heat exchangers.
Another object of this invention is to remove ?ns
from ‘lengths of ?nned tubes without damaging the re
maining ?ns.
has a saw 34 on its shaft for cutting the tube 11 when a
predetermined length has emerged from the ?nning ma
chine. A target disc 35 aligned with the axis of the tube
11, moves when the advancing end of the tube strikes it,
Another object of this invention is to close an open
a shaft 36 of support 37 which opens valve V13 which
end of a ?nned tube while ?ns are being removed from
admits compressed air into the cylinder C13 which moves
the tube.
35
the support 37 and the shaft 36 and disc 35 away from
Another object of this invention is to remove burrs
the adjacent end of the tube. At the same time the valve
from an end of a ?nned tube while ?ns are being re
V13 admits compressed air into the cylinder 16 to cause
moved from the tube.
the
half-nut 17 to engage the threaded portion of the
This invention will now be described with reference
shaft 13 to cause the plate 12 carrying the saw 34 to
to the annexed drawings, of which:
move forwardly. Not shown herein, but shown in said
FIG. 1 is a side view of a cut-off machine with con
trols for operating the machine of this invention;
FIG. 2 is a side view of one embodiment of this in
vention shown below the cut-off saw of FIG. 1;
FIG. 3 is a compressed air piping diagram showing the '
cam operated air valves of FIG. 1, and the compressed
air cylinders of FIG. 2;
FIG. 4 is an enlarged side view of the mechanisms
for working on the ends of the tubes, such mechanisms
being shown in section;
FIG. 5 is an enlarged top plan view, partially in sec
tion, of the mechanism for clamping and rotating a cut
o? length of ?nned tube;
FIG. 6 is an end view on a reduced scale of the clamp
ing mechanism of FIG. 5 clamped around a ?nned tube;
FIG. 7 is a section on the same scale as FIG. 6, along
the line 7—7 of FIG. 5, with the ?nned tube shown as
being ejected from the clamping mechanism;
FIG. 8 is a section on the same scale as FIG. 7, along
the line 8—8 of FIG. 5, and shows the clamping mecha 60
nism open for receiving a ?nned tube; and
FIG. 9 is an end view of the saw mechanism for re
application is a control which causes the saw 34 to cut
the tube 11 when the plate 12 has advanced a predeter
mined distance. When the tube has been cut off by the
saw 34, the valve V12 is opened to cause the cylinder
32 to rotate through the chain 31, the cam cylinder 26
back-wardly, restoring it to its initial position. This opens
the valves V1—V7 causing the cylinders C1~C7 to open
the tongs Tl-T7, permitting the cut-off tube to drop from
the tongs.
The plate 12 continues to move forwardly until an
other lug it carries opens an air valve V14 which ad
mits compressed air into the cylinder *16 to cause the
latter to pull the half-nut 17 out of engagement with
the threaded portion of the shaft v13. A spring 18 then
pulls the plate 12 back to its initial position. At the
same time, the valve V14 admits compressed air into the
cylinder C13 to cause the latter to move the assembly of
the target disc 35 to its initial position.
The construction described so far in connection with
FIGS. 1 and 3 is that disclosed in said application.
This invention adds the mechanism shown in the lower
portion of FIG. 2, and the controls for operating such
moving ?ns from intermediate the ends of a ?nned tube.
mechanism.
FIG. 10 is a view similar to FIG. 6, greatly enlarged,
The cam cylinder 26 of FIG. 1 has the additional cam
and
65
surfaces S8, S9, S10 and 811 which contact cam fol
FIG. 11 is a view similar to FIG. 7, greatly enlarged,
lowers which open valves V8, V9, V10 and V11 respec
and with other portions shown in section and in dashed
tively, after the cam cylinder 26 has been rotated back
line outline.
to its initial position to cause a cut-off tube to drop from
A conventional ?nning machine It] delivers rotating
?nned tubing 11 to the cut-off mechanism of FIG. 1, 70 the tongs. When a length of ?nned tube has been cut-off
by the saw, it falls from the open tongs T1—-T7, guided
which consists of a plate 12 having journalled thereto a
by guides 39, 4t} and 41 into a clamp shown in open posi
threaded shaft 13 driven by belt 14 and pulleys 15 from
tion by FIG. 8, consisting of a ?xed clamp segment 42
3,054,313
and a movable clamp segment 43, both segments having
inner surfaces formed as segments of a cylinder having a
diameter equal to the outer diameter of the ?ns on the
?nned tube 11. The cut-off tube when it falls into the
clamp is also supported on tables 44 and 65 atone side
of the clamp.
4
The previously described cutter tools 62 and 69 are
for removing ?n from the end of a ?nned tube so that
tube supports can be placed around the ends of a nest
of tubes of a heat exchanger. When the tubes have sub
stantial lengths, they need to be supported at one or more
intermediate portions, requiring removal of ?ns from such
portions. For accomplishing this, a sawing mechanism
The clamp has a frame 45 rotatably supportd on sleeve
80 is provided. It consists, as most clearly shown by
46 which is journalled in base 47. The sleeve 46 has a
FIG. 9, of a frame 81 having slidable thereon a base 82
pinion gear 48 therearound and attached thereto, and
having an upturned outer end 83 attached to piston rod
10
which is meshed with rack 49 attached to piston 50 of
34 of air cylinder C9, and having an upturned inner end
the air cylinder C10. A rotary shaft 51 extends through
88. An electric motor 85 is mounted on the base 82,
the sleeve 46 and has a pulley 52 thereon which is driven
and has a gear 86 on its shaft which is meshed with a
by belt 53 of electric motor 54. The shaft 51 has, as
gear 87 supported for rotation on top of the motor 85.
is shown more clearly by FIG. 4, a threaded inner end
The gears 86 and 87 have pulleys 89 and 90 respectively,
56 of reduced diameter on which is threaded a sleeve 57
attached thereto, and which rotate through belts 91 and
of a spinning head 58‘. The head 58 has a spinning tool
92 respectively, pulleys 93 and 94 respectively, attached
60 having a recess shaped as a portion of a sphere, and
to rotary saws 95 and 96 respectively. The pulleys 93
which when rotated by the motor 54, spins the adjacent
and 94 and the saws 95 and 96 are supported for rotation
open end of the cut-off tube 11 to close it as shown by
by the upturned inner end 88 of the base 82. Guides
FIG. 4. The head 58 also has a pair of diametrically oppo
98 are spaced apart a distance equal to the outer diameter
site cutter tools 62 having cutting edges in alignment with
of the ?n on the ?nned tube 11, and the saws 95 and 96
the outer surface of the tube on which the ?n is wound,
are spaced apart a distance equal to the diameter of the
and which, when rotated by the motor 54 cuts off the ?n
tube on which the ?n is wound. When the cylinder C9
at that end of the tube. The outer end of the shaft 51
is supplied with compressed air by the opening of the
is attached to the piston rod of cylinder C11 which is 25 valve V9, it moves the base 82 and the saws 95 and 96
adapted to move the head 58 forwardly, and to retract
towards the cut-off tube held in the clamp, until the saws
the head 58 as will be described later.
are opposite sides of the tube, the guides 98 positioning
Aligned with the shaft 51 at the opposite end of a cut
the cut-off tube which has some ?exibility, between the
off tube is an air cylinder C12 having a piston rod 66
saws. The saws 95 and 96 rotate in opposite directions.
the threaded inner end of which is formed as a grooved
The clamped tube is rotated 360° by the cylinder C10, the
tool 67 having an outer diameter equal to the inner diam
rack 49 and gear 48, while the saws 95 and 96 are aligned
eter of the cut-off tube, and which when revolved, re
with the tube, so that the ?n on the tube is cut off by the
moves burrs from the inner surface of the adjacent open
saws 95 and 96 leaving an un?nned space equal in length
end of the tube. A sleeve 108 is threaded onto the piston
to the sum of the widths of the two saws. The saws 95
rod 66, and has clamped thereto, a pair of cutter tools
and 96 operate at high speed as do the cutters 62 and 69
69 similar to the cutter tools 62, for cutting off the ?n
so that the ?n adjacent to the removed ?n is not bent or
at that end of the tube. The outer end of the piston
otherwise damaged.
rod 66 is within and attached to a coupling 68 which is
The cylinders C8-C11 are adapted to have compressed
driven by an electric motor 80.
air admitted into opposite ends for for moving their pis
The cylinders C11 and C12 are connected to the com 40 tons in opposite directions. The valves V8-V11 are
pressed air source through valve V11 which is opened
by a cam follower on cam surface S11 of the cam cyl
inder 26.
The movable clamp segment 43 of the tube clamp is
pivoted at 70 to a link 71 which is rotatably attached
to the lower end of piston rod 55 of air cylinder C8.
Beyond the ends of the clamp segments 42 and 43 are tube
ejecting ?ngers 72 which are attached to rod 73 which
is journalled for rotation in frame members 74. A latch
75 is pivoted at one end to the movable clamp segment
43, and its other end is curved to ?t against a curved pawl
76 attached through lever 77 to the rod 73 when the mov
conventional four-way valves which are operated by their
respective cam followers of the cam surfaces SS-Sll re
spectively, to admit air into one end of a cylinder when
its respective cam follower is on its respective cam sur
face, and to admit air into the opposite end of the cyl
inder when the respective cam follower leaves its respec
tive cam surface. The valves exhaust previously ad
mitted air before next admitting air. The valve V12
connects the interior of the cylinder 32 to atmosphere ex
cept when the valve V12 is operated to admit compressed
air into the cylinder 32.
able clamp segment 43 approaches its outermost position.
When the piston rod 55 is extended, the clamp segments
Operation
42 and 43 are closed about the cut off tube as shown
In operation, a ?nned tube emerging from the ?rming
machine 10 passes through the tongs T1-T7 which close
about the ?nned tube as it passes successively through
by FIG. 6. When the piston rod 55 is retracted, the clamp
segment 43 is rotated outwardly to permit the removal of
the tube, and the rod 73‘ is rotated by the pressure of the
curved outer end of the latch 75 against the pawl 76 to
them; the ?nned tube is cut-off by the saw 34; the cam
cylinder is rotated backwardly to restore it to its initial
position; the tongs open, and the cut-off tube drops from
from the clamp as shown by ‘FIG. 7, following which the
the tongs.
As the cut-off tube drops from the open tongs, it,
ejected tube rolls over de?ectors 78 on the ?ngers 72,
guided by the guides 39, 40 and 41, falls into the open
and falls below the clamp. A coiled spring 79 around the
clamp between the separated clamp segments 42 and 43,
rod 73 returns the rod 73 and the pawl 76 to their initial
.and onto the tables 44 and 45. The cam cylinder 26
positions. The latch 75 has a portion 99 extending per
pendicular thereto, and which rides over the pawl 76 when 65 again rotates forwardly as a new length of ?nned tube is
supplied by the ?nning machine. Before the advancing
the clamp segment 43' reaches its extreme outward posi
tion, by which time the tube will have been ejected from
end of the new length of ?nned tubing reaches the ?rst
of the tongs T1, the cam surface S8 operates the valve
the clamp.
The clamp segments 42 and 43 when closed about a
V8, admitting compressed air into one end of the cyl
?nned tube 11 when the movable segment 43 has been 70 inder C8, the piston of which closes the clamp segments
moved to its innermost position, are, as shown by FIGS.
42 and 43 about the cut-off tube to hold it in clamped
10 and 11, symmetrical about a common axis which is
position.
the rotary axis of the sleeve 46 to which the pinion gear
Next, the cam surface S9 operates the valve V9 to
43 is attached, and which rotates the frame 45 about
admit compressed air into one end of the cylinder C9,
75
that axis.
rotate the rod 73 to move the ?ngers 72 to eject the tube
3,054,313
the piston of which moves the rotary saws to a position
where their axes are in alignment with the axis of the
clamped tube, with the two saws rotating, the saw motor
85 operating continuously.
6
been moved to its innermost position, means supporting
said frame for rotation about said axis, a pair of tube
ejector ?ngers, one of said ?ngers being located beyond
one end of said clamping means, and the other of said
Next, the cam surface S10 operates the valve V10,
?ngers being located beyond the other end of said clamp
admitting compressed air into one end of the cylinder
ing means, said ?ngers having curved ends normally be
C10, the piston of which moves the rack 49 to rotate
low said clamping means, a rod rotatably attached to said
the gear 48 and the clamped tube through an angle of
frame and attached to the other ends of said ?ngers, and
360°.
means including means connected to said one side seg
Shortly after the cam surface S10 operates the valve 10 ment for rotating said rod for moving said curved ends
V10, the cam surface S11 operates the valve V11, admit
of said ?ngers upwardly and outwardly when said one
ting compressed air into corresponding ends of the cyl
segment approaches its outermost position.
inders C11 and C12. The motor 54 operates continuous
2. The invention claimed in claim 1 in which said
ly, and rotates continuously, the spinning tool 60 and the
means for rotating said rod comprises a pawl attached
?n cutters 62. The piston of the cylinder C11 advances 15 to said rod, and said means connected to said one side
the spinning tool 60 and the ?n cutters 62 to close the
segment comprises a latch pivoted at one end to said one
left end of the rotating clamped tube, and to remove the
side segment and having at its other end .a surface for
?n from around that end of the tube. The motor 80
contacting said pawl.
operates continuously to rotate continuously, the ?n cut
3. The invention claimed in claim 2 in which said
ters 69 which remove the ?n from around the right end 20 ?ngers between their ends are provided with upper sur
of the tube, and the grooved tool 67 which remove the
faces which slope downwardly from said curved ends
burrs from the inner surface of that end of the tube.
when said curved ends have been moved to their upper
When the rack 49 has rotated the clamped tube 360°,
most and outermost positions, for transferring by gravity
it and the clamped tube remain stationary for a short
from said frame, a tube ejected from said clamping
period of time during which the cam surfaces S9 and 25 means.
S11 leave their respective cam followers. The valve V9
4. The invention claimed in claim 1 in which means
is operated to admit compressed air into the opposite end
is provided for rotating said frame about said axis sub—
stantially 360° in one direction, and for then rotating
said frame about said axis substantially 360° in the oppo
time, the valve V11 is operated to admit compressed air 30 site direction.
into the opposite ends of the cylinders C11 and C12,
5. In a machine for preparing spirally ?nned tubes for
retracting the spinning tool 60, the ?n cutters 62 and 69,
assembly in heat exchangers, a frame, clamping means
and the grooved burr removing tool 67 from contact with
for receiving and clamping a spirally ?nned tube dropped
the ends of the clamped tube.
vertically from over said clamping means, said clamping
Next, the cam surface S8 leaves its cam follower, 35 means comprising a pair of side segments attached to said
operating the valve V8 to admit compressed air into the
frame, said segments having inner surfaces formed as
opposite end of the cylinder C8, to cause its piston to
segments of a cylinder, means for moving one of said
move the clamp segments 42 and 43 apart, and to cause
segments inwardly towards or outwardly away from the
the ?ngers 72 to eject the tube from the now open clamp.
other of said segments, said segments being symmetrical
Next, the cam surface S10 leaves its cam follower, 40 about a common axis when said one side segment has
operating the valve V10 to admit compresed air into the
been moved to its innermost position, means supporting
opposite end of the cylinder C10 for causing its piston
said frame for rotation about said axis, and means for
to retract the rack 49.
rotating said frame about said axis from its normal tube
The cut-off tube with its ?n and burrs removed, and
receiving position a predetermined number of degrees
one end closed, is suitably received after ejection from 45 in one direction and for then rotating said frame about
the clamp, and is ready to be assembled in a multi-tube
said axis back to said normal position.
coil.
For some coils, the opposite ends of the tubes are left
References Cited in the ?le of this patent
open for connection to headers so that for such tubes,
the spinning tool 60 would not be required, and would 60
UNITED STATES PATENTS
be replaced with another burr removing tool.
1,080,576
Overgaard ___________ -._ Dec. 9, 1913
What is claimed is:
1,378,865
Hibbard ____________ -._ May 24, 1921
1. In a machine for preparing spirally ?nned tubes for
1,424,755
Cullen ______________ __ Aug. 8, 1922
assembly in heat exchangers, a frame, clamping means
1,572,924
Hand _______________ __ Feb. 16, 1926
for receiving and clamping a spirally ?nned tube dropped 55 1,704,702
Floeter ______________ __ Mar. 12, 1929
vertically from over said clamping means, said clamping
1,956,999
Rupple _______________ .._ May 1, 1934
means comprising a pair of side segments attached to said
2,188,447
Smith _______________ -._ Jan. 30, 1940
frame, said segments having inner surfaces formed as seg
{2,227,443
Denner ______________ .._ Jan. 7, 1941
of the cylinder C9 to cause its piston to move the saws
95 and 96 away from the clamped tube. At the same
ments of a cylinder, means for moving one of said seg
2,337,667
ments inwardly towards or outwardly away from the 60 2,663,206
other of said segments, said segments being symmetrical
about a common axis when said one side segment has
2,803,153
2,835,372
Kuelman ____________ __ Dec. 28, 1943
Whiting _____________ .._ Dec. 22, 1953
Golbeck ____________ __ Aug. 20, 1957
Biddison ____________ __ May 20, 1958
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