POWER HEAD OF ROTARY DRILLING RIG AND ROTARY DRILLING RIG

摘要

A power head of a rotary drilling rig and a rotary drilling rig. The power head comprises: a drive device (110) and a transmission device. The transmission device comprises an input shaft (136), a first output shaft (132) and a second output shaft (143). The input shaft (136) is in drive connection with the drive device (110). The first output shaft (132) is configured to be in drive connection with a drill rod (200) of a rotary drilling rig. The second output shaft (143) is configured to be in drive connection with a casing drive (300) of the rotary drilling rig. The second output shaft (143) has a first state. Under the first state, when the drive device (110) drives the input shaft (136) to rotate, an output torque of the second output shaft (143) is greater than that of the first output shaft (132). The power head enables the second output shaft (143) to be in the first state when it is necessary to fully bury a casing, and outputs an output torque greater than an output torque during driving of the drill rod (200) so as to drive the casing drive (300), such that a casing can be smoothly buried using own functions of a rotary drilling rig, and high construction efficiency can be achieved.