SWDM240B OPERATION & MAINTENANCE MANUAL
2.3.8 Rotary Head
Rotary head, as shown in FIG. 2-17, is mainly composed of sliding frame and gyrator.
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
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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 head 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.
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