Rotary drilling rig and hoisting system of rotary drilling rig

The utility model discloses a rotary drilling rig and a hoisting system of the rotary drilling rig. The hoisting system comprises a main hoist (1) and a floating oil way, wherein a steel wire rope is wound on the main hoist (1). A floating switch device controlled by a floating switch (2) is arranged on the floating oil way. A safety protection device connected in series with the floating switch device is arranged on the floating oil way and comprises a detection switch (3) and a controller (4), wherein the detection switch (3) is used for detecting the tensile force of the steel wire rope, and the controller (4) is used for receiving a detection signal and transmitting a control instruction, so that the floating oil way can be switched on or off according to the control instruction. The utility model also provides the rotary drilling rig. By adopting the rotary drilling rig and the hoisting system of the rotary drilling rig, accidents such as not-well braked drill string and the like caused by misoperation over the floating switch are avoided, the using safety of a drilling tool is ensured, the use cost is reduced, and the personal safety of operation personnel is ensured. In addition, the utility model also discloses the rotary drilling rig comprising the hoisting system.