ZFY0.9 / 15/90 (ZLFY-90) reverse well drilling rig
ZFY0.9 / 15/90 (ZLFY-90) reverse well drilling rig is a construction equipment for drilling a wellbore between two working levels: the two working levels are referred to as the upper level and the lower level. The working site for drilling rig construction is at the upper level, which can be a roadway or chamber, or it can be open-air. It is called the working point. The penetration point of the drilling rig to form a well is at the lower level. Generally, it is the roadway or chamber.