组合式软岩钻杆
组合式软岩钻杆/ Combined- type soft rock drill pipe
钻杆为空心结构、重量轻、抗弯性能良好。大螺距排粉，排粉粒度大，粉尘少。方孔卡豆式连接，节约安装时间，提高连接的可靠性，避免丢、卡钻头现象。钻杆首尾可互换，増加了钻杆的使用寿命。连接杆
可打15m内深孔。
Drill pipe is hollow structure, light weight, bending performance is good. Big big row pitch powder,powder particle size, less dust. Square hole card bean type connection, saving installation time, improvethe reliability of conne ction, avoid to being thrown away and the phenomenon of drill bit. Drill pipe end areinterchangeable, increased the service life of drill pipe. Connecting rod to play within 15 m deep holes.
