Kelly bar is the key part of a
drilling machine, and its quality
directly affects the performance
of the whole machine. The main
purpose of kelly bar is to transfer
the torque of rotary drive and
crowd pressure of the crowd
system to the drilling tool. Based
on the rich manufacturing
experience and by absorbing the
advanced technology both at
home and abroad, we can
produce first-class kelly bar which
can be compared favorably with
the imported ones. There are mainly two types of
Kelly bars: 1- Interlocking Kelly Bar
2- Friction Kelly Bar
1) Interlocking Kelly Bar
Interlocking Kelly bars are used
with piling rigs for drilling in
dense sand and gravel and weak
to strong rock. The Interlocking
Kelly bars manufactured by
Unimate can be fully locked by
mechanical locking system on
each section. Kelly bars can be
equipped with specially designed
springs or pressure plates for
shock absorbing purpose.
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