1.Brief introductions of QZ-3 diesel engine sampling drilling rig The QZ-3 diesel engine sampling drilling rig is independently developed by Shandong Master Machinery Group Co.,Ltd., which is a portable multi-purpose drilling rig. The QZ-3 diesel engine sampling drilling rig is equipped with a hoist, which is more convenient for geological drilling and lifting. It can do standard drilling hole, earth sampling and cone penetration with the heavy hammer. The QZ-3 diesel engine sampling drilling rig uses diesel power, and it is more convenient to purchase oil. The rig is reasonable in design, advanced in structure, easy to assemble and disassemble, small in size, light in weight and easy to transport, which brings great convenience for field investigation and construction. 2. Technical parameters of QZ-3 diesel engine sampling drilling rig QZ-3 diesel engine sampling drilling rig Borehole diameter (mm) 46-110