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Today, Zhongyi Huilong Pile Driver and Rotary Drilling Rig will introduce us to our common rotary drilling bits, mainly including spiral drilling bit, rotary bucket, barrel coring bit, underreamer bit, percussion bit, percussion grab cone bit and hydraulic grab bucket. The following is a brief introduction. 1.1 Auger bit (1) Conical: double head double screw,dth drill bits, suitable for hard bedrock. Double-headed single screw, suitable for weathered bedrock, pebbles, frozen soil with ice, etc. The above drill bits are equipped with various picks,dth rock bit, and many types of drill bits can be derived through the changes of tooth type, pitch and helix angle. (2) Straight spiral bit: A. Bucket tooth straight screw: double-headed double screw, applicable to sandy soil and poorly cemented small-diameter gravel layer; double-headed single screw, applicable to sandy soil and soil layer; single-headed single screw, applicable for poorly cemented large-diameter pebble, cohesive soil and hard clay. B. Pick straight screw: double screw, triple screw and quadruple screw, suitable for hard bedrock or gravel. 1.2 Rotary drilling bucket Expand the full text According to the installed teeth, DHD Drill bit ,down the hole bit, it can be divided into pick drilling bucket and bucket tooth drilling bucket; according to the number of bottom plates, it can be divided into double-layer bottom bucket and single-layer bottom bucket; Such drill bits are used by hanging the auxiliary hook of the rotary drilling machine. Because of the impact effect, the auxiliary hook is required to have the function of free rope release to achieve better results. 1.6 Hydraulic grab At present,fastest dth hammer, there are more and more construction projects of diaphragm wall and anti-seepage wall. If the rotary drilling rig is slightly changed, it can work. The opening and closing of the hydraulic grab bucket is driven by hydraulic pressure. There is only one oil cylinder on the hydraulic grab bucket, so only two oil pipes and one control valve are needed. Return to Sohu to see more Responsible Editor:. wt-dthtools.com