... crawler belt 3.lower power consumption MDL-130DX Multifunctional Crawler Drilling Rig :1. Application -- Multifunctinoal city foundation pit,subway,bridge, ... hole guiding hole, geothermal hole such drilling hole construction. 2. Machine Type: Anchor Drilling Rig Machine. 3.Main Construction Characteristics:(1) ... mm)Φ73,Φ89 (Φ102,Φ114) Hole Angel(°)0~90Output rotary speed of power head(r/min)10,20,30, ...