Airetool Tube Cleaner and Expanders Catalog - Tecno Italia s.r.l

58
Boiler Expanders
Boiler Tube Expanders B-2000
Series Patented Thrusts Assembly
Airetool B-2000 Series boiler tube expander with its
patented drift thrust assembly represents a major
advancement in boiler tube expanding. Using a ball
bearing, spring loaded drift thrust collar, the B-2000
Series expanders can be accurately positioned in the
boiler tube in relation to the drum for consistent joint
expansion.
In operation, the initial positioning of the expander in the
tube allows the self-feed rolls to draw the expander into
the tube and to engage the flaring rolls at the proper point
during the operation. The use of either an electric or air
driven torque controlled rolling motor with the B-2000
Series expanders produces more uniform flares and very
precise tube wall reduction.
Accomplishes three unique functions in one operation
First
The unique depth adjustable ball bearing
drift thrust collar enables the B-2000
Series expander to be positioned into the
tube at exactly the same setting every
time. Once set, the mandrel is inserted in
the expander causing the rolls to be
forced outward into contact with the tube
I.D., starting the rolling process.
Second
As the mandrel is rotated, the initial
rolling of the straight section takes place.
As the mandrel rotation is continued, the
drift thrust collar stops the expander at
its final operating depth in the tube.
During this phase the flaring rolls have
also moved into their final depth position.
Third
Continued mandrel rotation now will allow
the straight rolled area to be finished. At
this point the amount of torque required
is greatly increased. The torque
mechanism in the motor measures the
torque and when the set torque is
reached the motor automatically shuts
off. During this phase the expander being
held in place by the thrust collar allows
the flare rolls to iron out the end of the
tube to a smooth and precisely located
flare. After shut-off, reversing the motor
will back the expander out of the finished
tube while at the same time resetting it
for the next tube.