Do you know what are the classifications of engineering drilling rigs?
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Engineering drilling rigs are a classification and extension of drilling rigs. As the name suggests, engineering drilling rigs are drilling rigs used for large-diameter cast-in-situ pile construction in high-rise buildings, ports, docks, dams, electric power, bridges and other projects.
It is composed of power part, main and auxiliary hoist, gearbox, reduction box, grinding disc, hydraulic part, faucet, drill pipe, frame, control box and other auxiliary components.
Let's take a look at the classification of engineering drilling rigs:
1: Percussion drilling rig The vertical reciprocating motion of the drilling tool makes the drill bit hit the bottom of the well to break the rock formation. Its structure is simple, there is no circulation flushing system, and the removal of cuttings and the drilling rig cannot be carried out at the same time, so the efficiency is low.
2: Rotary drilling rigs rely on the rotary motion of the drilling tool to break rock formations and form holes
3: There are two types of composite drilling rigs: one is a water well drilling rig that combines impact and rotary action, such as a pneumatic down-the-hole hammer drilling rig. The down-the-hole hammer drilling tool is composed of a cylinder liner and a piston.
The high-pressure air provided by the air compressor pushes the piston to reciprocate up and down, and impacts the drill bit to enhance the ability of the drill bit to penetrate into the rock formation. At the same time, the drilling tool rotates at a relatively low speed of 35-60 rpm.
The air exhausted from the upper and lower cavities of the piston enters the drill bit and carries the cuttings at the bottom of the hole out of the wellhead. Pneumatic down-the-hole hammer drilling rigs can be used for drilling deep wells in hard rock formations, with high drilling speed and straight well holes.
The other is to add an impact mechanism on the basis of the rotary table rotary drilling rig, which is mainly used for rotary drilling. When encountering pebble layers, it is a dual-purpose water well drilling rig that uses impact drilling to drill, and has strong adaptability to various strata.
