A core drill (CB) is a special type of drill tool that allows rock cores to be broken by a hammer drill or auger bit by cutting a ring-shaped groove.
Due to differences in the welded cutting ring, core drills are classified into four types: CB-I, CB-II, CB-III, and CB-IV.hole drilling machine price
Tube Drill
For relatively hard bedrock strata, large boulder layers, and hard permafrost layers, direct drilling with auger or rotary drilling bits is difficult. Tube drill bits are needed in conjunction with auger and sand-dredging bits. They are divided into core-taking tube drill bits and non-core-taking tube drill bits. Depending on the strata being drilled, they are further divided into cutting tooth tube drill bits suitable for weathered bedrock and permafrost layers, and roller cone tube drill bits suitable for hard bedrock. The core-taking tube drill bit has the following structural features and operating principle: The bucket body consists of an inner tube and an outer tube. The outer tube is welded with main cutting teeth, and the inner tube is welded with secondary cutting teeth. The lower end of the inner tube is equipped with hinges to support the rock core.hole drilling machine price
Category
Rotary drilling rig, small rotary drilling rig, piling machine. During drilling, the core is pushed open by the hinge and enters the pipe. When the drill is pulled out, the hinge, under its own weight, remains in a horizontal position, sealing the core inside the inner pipe and carrying it out of the hole. Non-corering annular core drill bit structure characteristics and working principle: Cutting teeth are directly welded to the lower part of the drill bit body. During drilling, the corer first drills the formation in an annular shape into a cylindrical shape, and then the auger drill bit is lowered to break the circular core into fragments, which are then retrieved using a sand scoop.
Shandong Liqiang Machinery's friendly reminder of operating precautions: The drill can be pulled out when the hole is full, but it must be done slowly. Because this drill bit has an internal cutting edge, it is possible to retrieve the core or large boulder even without a corer. If it cannot be retrieved, this is normal, as its main purpose is to create a free cutting surface for further retrieval using a sand scoop or auger drill bit.hole drilling machine price
