LIEBHERR
TESCAR
Friction
Kelly
Bar
In
Construction
Machinery
Parts
Advantages
of
drill
pipe:
1.
All
kelly
rods
are
made
of
high-strength
alloy
seamless
steel
pipes.
2.
All
inner
key
plates
adopt
integral
forging,
high
strength
and
good
wear
resistance.
3.
The
lock
and
the
drive
shell
adopt
high-strength
forged
wear-resistant
plates.
4.
A
reinforcing
ring
is
installed
at
the
bottom
of
the
terminal
to
prevent
cracking.
5.
Our
driving
section
is
built
by
ourselves.
6.
High-strength,
high-wear-resistant
alloy
steel
forged
square
head.
7.
High-strength
wear-resistant
running
water
plate
and
high-strength
flexible
spring.