Rotary drilling rig is also called rotary drilling rig and pile driver. Rotary drilling rig is a comprehensive drilling rig, which can use a variety of bottom layers and has the characteristics of fast hole-forming speed, less pollution and strong maneuverability. The short spiral drill bit can be used for dry excavation or wet excavation with rotary drill bit under the condition of mud wall protection. Rotary excavators can cooperate with impact hammers to drill hard strata and then dig holes. If the drilling tool with enlarged head is matched, reaming operation can be carried out at the bottom of the hole.
The drilling and rotary excavator 1999 was officially built in China, and there is no formal operation certificate in China. This is a special job. Because the rotary excavator is for foundation construction, that is, pile foundation. The drill bit works underground and is invisible to the naked eye. It is built entirely by the experience of on-board computers and mechanics. Therefore, the requirements for machine operators are relatively high. After being familiar with rotary drilling rig operation, mechanics should also be familiar with various drilling tools, strata, construction technology and site turnover. With this, the hole bottom reaming operation can be carried out.
Reasonable selection of rotary excavator needs to know the working conditions of rotary excavator and the performance of wire rope. In the working state of rotary drilling rig, when lifting or lowering drill pipe, the force on wire rope is not a fixed value; In the process of lifting the drill pipe, the wire rope is subjected to three forces, namely, the adsorption force between the drill bit of the rotary drilling rig and the underground, the buoyancy of wet mud on the rotary head and the weight of the drill bit itself. Therefore, it is necessary to require steel wire rope to have good wear resistance and high strength.