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Rotary head is Heavy duty hydraulic driven top head rotation head unit with single speed or dual speed arrangement having infinitely variable speed (0 to 500 rpm) and is designed for required user torque and speed. This unit travels on the mast and is of sturdy construction to absorb sudden & varying shock loads generally encountered during drilling operations.
Based on requirement selecting the type of Drive whether it is a direct drive or Gear transmission. If we select Direct Drive then the torque and speed to be achieved by the rotary head will depend upon the torque and speed hydraulic motor. Only one motor can be used when user selects the Direct Drive. In Direct Drive the Main spindle of Rotary Head is directly connected to the motor shaft by Providing the key slot on Main Spindle. Based on application we will be selecting the speeds of gearbox 1 speed or 2 speeds or 4 Speed Gear box. Only for Core Drilling we use 2 speeds or 4 speed gear box. In all other drilling applications single speed gear box has to be used.
As material for gear box casing, good quality cast iron is used in most of the cases. Steel castings or light metal castings are also popular, but they are used in special cases. Fabricated housings are also used. Cast iron housings have good damping properties and freedom from noise. The life time of these casting is also considerably efficient. Steel casting which are obviously much costlier than CI housings, are used in only those cases where CI casings are not strong enough to withstand the operational stresses involved. In our work the gear box of different materials (steel and cast iron) was analyzed by finite element methods. From the above results the Maximum Von mises stresses are observed for steel and cast iron materials. The values are under safe load condition for steel but not for cast iron. The Stress Levels for gear box was checked under max load condition with load of 181000 N and proved to be safe design and suggested to use operations and also for Heavy Engineering Equipment. Under such load, the Von Mises stress induced in the CI casing is more than that of Steel casing. Though the cost of manufacturing of the steel gearbox housing is more compared to CI casing, usage of Steel casing is suggested here to work without failure.
