SWDM40 OPERATION & MAINTENANCE MANUAL
Sliding frame is used to support gyrator to make it move in sliding rail and transfer force;
gyrator is mainly composed of two hydraulic motors、planetary, drive gear, gear box and drive
sleeve etc. The working theory is that the driving sleeve drives the kelly bar to rotate after speed
is reduced by driving gear and speed reducer. The first stage lubrication of the gear box adopts
circulation lubrication and the second stage lubrication adopts oil-bath lubrication. Planetary is
imported. When spinning-off is required, it can exchange Rotary drive or jerk in high speed.
The driving sleeve has rectangle teeth and rotates with the kelly bar when they are engaged the
control system is a variable pump, variable motor system and it can automatically adjust its
speed and torque (power load sensing) according to different soil condition
2.3.7 Kelly Bar, Drilling Tools
2.3.7.1 Kelly Bar
Kelly bar is an essential component to transfer torque and pressure. It’s the telescopic type
，
the first section (outer section) engages with Rotary drive by rectangle teeth to transfer torque
and pressure. Top Kelly bar is connected with sliding rail through slewing bearing and bracket
to make it free rotate and slide up and down within Rotary drive. Inner each section Kelly bar
match outer section Kelly bar by rectangle teeth. When teeth is closed, it can transfer axial
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