Engineering drill is a classification and extension of the drill, as the name implies, engineering drill is used for high-rise buildings, ports, docks, DAMS, power, Bridges and other projects of large diameter cast-in-place pile construction drill.
Common e
ngineering rig structure:
It is composed of the power part, main and auxiliary winch, gearbox, reduction box, millstone, hydraulic part, faucet, drill pipe, rack, control box and other auxiliary parts.
Classification of
engineering rigs:
1: the percussion drill relies on the vertical reciprocating movement of the drill, so that the drill bit impacts the bottom of the well to break the rock layer. It has simple structure, no circulating well washing system, cuttings removal and drilling machine can not be carried out at the same time, so the efficiency is low
2: the rotary drill relies on the rotary motion of the drill tool to break the rock formation into holes
3. There are two types of composite drilling machines: one is the well drilling machine that combines impact and rotary action, such as the pneumatic hammer drill. The hammer drill is composed of cylinder liner and piston. The high pressure air provided by the air compressor pushes the piston up and down reciprocally, striking the drill bit to enhance its ability to drill into rock. At the same time, the drill rotates at a lower speed of 35 ~ 60 RPM. The air discharged from the upper and lower cavities of the piston enters the drill and carries the cuttings off the hole bottom out of the wellhead. Pneumatic hammer drill can be used for drilling deep Wells of hard rock, with high drilling speed and relatively straight hole. The other is to add the impact mechanism on the basis of rotary rotary drilling, mainly rotary drilling, when the pebble bed with impact drilling dual-purpose well drilling, strong adaptability to various strata
