Note: Descriptions are shown in the official language in which they were submitted.
1049776
The invention relates to apparatus for delivering fluid
material to a surface, for example, refractory slurry apparatus
for lining and patching the interior of refractory lined chambers
particularly for use in those chambers relating to the manufacture
of steel. The apparatus is especially useful in hot coke ovens
for patehing craeks and spalled areas in the refraetory linings
of sueh ovens.
Modern eoke ovens generally eonsist of a plurality of
narrow, elongated horizontal ovens arranged side by side in groups
ealled batteries. Ovens are generally less than two feet in
width and eommonly have lengths of about forty feet and heights
ranging from ten to fifteen feet. Eaeh end of a eoke oven earries
a briek-lined removable door. The side walls of a coke oven are
eonstrueted of siliea-brick set in silica mortar which forms a
eeramie bond at high temperatures.
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" 1049776
During the coking process the intense heat often causes
large cracks to occur in the refractory walls of the oven and
may also cause spalling with the wall surface. Such cracks must
be sealed with a silica refractory material to prevent leakage of
volatile gases into the flues from whence such gases would be
exhausted to the atmosphere via the battery stack. Spalled areas,
if not restored to the original wall configuration, cause the
formation of "stickers", the coke in the oven expanding to fill the
cross-section in a spalled region which then resists being pushed
through the narrower portion of the oven upon completion of the
coking process.
Heretofore, patching of cracks and spalled areas has
been accomplished by utilizing conventional refractory spray
devices equipped with various lengths of small diameter pipes.
These pipes allow manual manipulation of the spray nozzle through
doors or charging holes into oven chambers to reach and patch the
cracked or spalled regions. The intense heat of the coke ovens
subject repair personneL to considerable physical discomf~rt.
Restricted openings through which apparatus must be inserted to
accomplish the repairs and the physical effort required to
manipulate long sections of pipe often result in inadequate
patching of crac}ced and spalled aréas which causes continued gas
leakage and difficulties in coke pushing. Further, this method of
patching is slow and inefficient particularly where a multi-battery
coke plant requires a large volume of repair work.
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"` ~04977~
The closest known prior art is sowman United
States Patent No. 3,473,737.
It is the primary ob~ect of this invention to
provide an apparatus for delivering gunning material to the
inside of a furnace or oven, which apparatus is readily
portable from oven to oven, and has sufficient
maneuverability to manipulate a refractory spray nozzle
to any given area within the oven.
According to the invention there is provided
Apparatus for delivering f].uid material to a surface
comprising; a base; a boom support frame vertically spaced
from said base; a delivery boom operatively mounted in said boom
support frame and having a delivery outlet, an upstanding mast
interconnecting said boom support frame and said base including, :
;an upright elongated cylindrical sleeve extending downwards
from said boom support frame and having its upper end arranged
to support the latter; and a vertically extendible and retractible
fluid pressure operated actuator having its opposite ends
attached to the base and the sleeve respectively for raising
and lowering the sleeve and the boom support frame,vertically.
;The invention is illustrated, by way of example,
in the attached drawings, in which: ~ -
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`` 104977f~
Figure 1 is a side elevational view of my invented mobile
fluid refractory material spraying apparatus mounted on a truck.
Figure 2 is a side elevational view of my apparatus on
a larger scale than that of Figure 1.
Figure 3 is a horizontal section view of the support
apparatus taken along the line III-III of Figure 2.
Figure 4 is a partially sectioned view of the boom and
rotational drive taken along the line IV-IV of Figure 2.
Figure 5 is a detailed view of the front boom drive
apparatus taken along the line V-V of Figure 2.
Figure 6 is a detailed view of the rear boom drive
apparatus taken along the line VI-VI of Figure 2.
My refractory delivery device 10 is m'ountable on any
desired mobile carrier such as a truck 12 shown in Figure 1. My
complete operating unit consists of the transporting vehicle, my
device, a standard air compressor, a hydraulic system, a slurry
mixing tank, supply tank, a source of cooling water and spray
water, and all necessary piping.
Mast 14 is mounted on a base 16, which in this case is
the bed of truck 12. The mast consists of a sleeve 18 supported by
a mast lifting cylinder 20 inside the mast sleeve. A mast track
frame 22 is also fixed to base 16. The mast track frame 22 consists
of four upright corner posts 24 connected outside their perimeter by
a number of structural members 26 to give them the necessary rigid-
ity. Each corner post 24 carries a wear plate 28 or wear angle as
shown in Figure 3~ Mast carriage 30, which rides inside mast track
frame 22, is a cage fastened to mast sleeve 18 by connecting
plates 32.
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~(~49776
At each upper and lower corner of the cage, a pair of guide rolls 34
are journaled to the cage for vertical movement of the carriage.
A mast cap 36 which is a cylinder closed at the top and
open at the bottom is situated atop the mast sleeve 18. The
internal diameter of the mast cap is very slightly larger than the
external diameter of the mast sleeve. This very close tolerance
prevents play in the apparatus and allows the gunning apparatus to
place material accurately. An annular gear 38 is fixed to the
bottom of mast cap 36. Hydraulic drive motor 40 with its
associated pinion 42 is fixed to the side of mast sleeve 18. The
clevis at the top of the mast lifting cylinder 20 is fastened to
mast sleeve 18 by pin 44 and its associated cotter key.
Mast cap 36 carries mounting brackets 46 atop it and oppos-
ed mounting brackets 48 on its sides. Boom support frame 50 is
, attached to mounting bracket 46 by pins and matching mounting
; brackets 52 longitudinallv centered on its underside. Tilting
cylinders 54 are fastened to mast cap 36 through mounting brackets 48
and to boom support frame 50 through mounting brackets 56. Boom
support frame 50 carries a pair of bearings 58 in which boom support
60 is journaled. Boom support frame 50 also carries motor support 62
upon which drive motor 64 is mounted. A large drive sprocket 66 is
attached to the center of boom support 60 as shown in Figure 4. A
small drive sprocket 68 is carried by the drive shaft of motor 64.
The drive between the motor and the boom support is shown in Figure 4.
A small drive sprocket 68 is carried by the drive shaft of motor 64.
The drive force between the motor and the boom support is provided by
drive chain 70,-- which passes over both the large sprocket 66 and the
small sprocket 68.
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~Q49776
Boom support 60 also carries front boom drive 72 and rear
boom drive 74. The front boom drive is determined by being nearer
the end of the boom which carries the nozzle and the rear boom drive
by being nearer the end of the boom which carries the slurry and
water inlets. The boom drives 72 and 74 engage a boom 75 which is
a hollow structural tube having watertight seals 78 and 79 at each
end to form a cooling chamber therein. The boom preferably has a
square cross section as shown in Figures 5 and 6, Centrally
situated in the boom is a slurry pipe 80 which extends completely
through the boom to the spray nozzle 82, which nozzle is attached to
the end of slurry pipe 80 protruding from the boom. A water spray
pipe 84 is also housed in the boom. Water inlet pipe 86 is located
on the rear of the boom and terminates just inside the watertight
seal 78. Water outlet pipe 88 extends through the boom to a short
distance from the watertight seal 79 at the nozzle end of the boom.
Pipe supports 90 do not completely fill the boom but leave spaces
for cooling water to flow therearound.
Front boom drive 72 comprises a pair of rollers, driven
roller 92 and idler roller 94, both of which engage a surface of the
boom 78. The drive support 96 also carries reversible drive motor
98 which is coupled to the drive roll 92, as well as a spring
retainer 100 which houses a pair of compression springs 102, which
bear against the chocks of idler roll 94.
Rear boom drive 74 includes a drive support 106 which
carries a pair of driven rollers 108 and 110, with their respective
reversing drive motors 112 and 114 and their respective couplings
116 and 118. Stops 122 and 124 are fixed to the front and rear of
the boom respectively to prevent the boom from overextending or
from overretr~ing during its traversing motion.
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1049776
Also carried on the vehicle 12 are an air compressor
130, a sydraulic unit 132, a slurry mixing tank 134 and a supply
tank 136. Air compressor 130 provides the compressed air
required to pump the slurry from the supply tank through the
slurry pipe 80. Hydraulic unit 132 provides all of the
required hydraulic pressure to operate each hydraulic cylinder
and each hydraulic motor. The hydraulic connecting lines are
not shown in the drawings since each of these is conventional.
Slurry mixing tank 134 acts as a holding tank or as a mixing
tank in which dry refraetory material is mixed with water
to form a slurry.
My mobile refractory spraying apparatus is capable
of five motions after being transported to the working site.
The boom and nozzle can be raised in elevation by actuating
mast lifting cylinder 20. This moves all of the apparatus
upward within the mast track from 22, including mast carriage
30. Mast earriage guide rolls 34 bear against wear plates
28 in opposite direetions and at vertically spaced distances.
This prevents any bending moment from being exerted on the
mast 14 during movement of the boom.
When reversing sydraulic drive motor 40 is actuated,
pinion 42 engages annular gear 38 on mast cap 36 initiating
rotational movement of the mast cap and boom apparatus about
the vertical axis of mast 14. Of course, the mast cap can be
rotated in either a cloekwise or eountereloekwise direetion.
Double aeting eylinders 54 are actuated to tilt the
boom 76 about the horizontal axis of the pin in mounting
braeket 52. Both eylinders 54 are powered simultaneously in
opposite direetions, that is, on eylinder rod is extended while
the other eylinder rod is retraeted to tilt the boom.
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1049776
Boom support 60 is rotated about its longitudinal axis by
operation of reversing hydraulic drive motor 64 through drive
sprocket 68 and drive chain 70, which chain engages both sprocket
68 and drive sprocket 66 on boom support 60. Since the boom 76 is
held against rotation by the rolls of the front boom drive 72 and
the rear boom drive 74, rotation of the boom support 60 imparts
the same angular rotation to boom 76 and in the same direction.
The angular rotation allows exact aiming of the nozzle 82.
Boom 76 receives its traversing motion from the drive
rolls of rear boom drive 74 and front boom drive 72. The front boom
drive has a single drive roll 92, and the boom is constantly urged
into contact with drive roll 92 by the action of compression
springs 102 against the chocks of idler or guide roll 94. Rear boom
drive 74 employs two driven rolls 108 and 110, which are driven by
their associated reversing hydraulic drive motors 112 and 114.
At the work site, a source of water is connected to the
cooling water inlet 86 and the water spray pipe 84. Water flows
continuously through the inlet pipe, the boom and the water outlet
pipe 88 to continuously cool the boom and its associated parts.
Slurry in either a wet or dry form is conveyed from the gun tank
136 by a connecting hose through the slurry pipe 80 to the spray
nozzle 82. Water spray pipe 84 delivers water through the boom to
a water spray nozzle attached to the end of spray pipe 84 on the
front end of the boom when dry silica compound is applied to damaged
oven surfaces.
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1049776
It is readily apparent from the foregoing that the
apparatus shown in the drawings is capable of accurate
placement of refractory materials in a hot or cold oven
which may be otherwise inaccessible; that my apparatus is
capable of imparting five motions to a spray nozzle
including horizontal traversing, vertical traversing, tilting~
horizontal rotation and vertical rotation; and all motions
are capable of being controlled by a single individual
remotely from a position away from the heat of the furnace.
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