The series of drilling using Feilong company oil, mining drilling manufacturing experience, developed and produced can be widely used in urban subway, high-speed rail foundation and building pile foundation engineering, according to all kinds of rock layers, optimized design, using different teeth, tooth height and reasonable teeth, has good drilling performance, targeted bearing system optimization, bearing capacity, widely used in rotary digging market.
This series of drills use high strength and high toughness carbide teeth, and pick the optimized number of teeth, teeth number, exposed teeth height of the tooth structure design, give full play to the high wear resistance and excellent cutting ability;
The high-strength wear resistance material between the large runway and the friction side reduce the friction heating, enhances the bearing wear resistance and has a longer working life;
The diameter protection material of the new palm wheel is adopted, and the palm adopts the symmetrical full diameter structure to reduce the friction between palm back and well wall, protect the palm tip and seal, enhance working stability, and improve the quality of the well wall;
Use vacuum oil injection to reduce the bearing auxiliary wear;
steel ball lock tooth wheel to accommodate high speed;
3、Recommended drilling parameters
Formation with moderate hardness with high compressive strength, such as hard shale, limestone, sandstone, dolomite, etc.
Formation with high compressive strength, medium-hard and high abrasive properties, such as limestone, dolomite, sandstone, flint, etc.
Note: The upper limits of drilling weight and rotary speed recommended in above table could not be used at the same time.
It can be designed and developed according to user needs.