A Rotary Drill Rig with Controllable Compressed Gas Injection Rate

Abstract

The invention discloses a roller cone drilling machine capable of controlling the jet velocity of compressed gas. According to the position of a drill bit in the process of drilling, the jet velocity of the compressed gas is controlled, and when the drill bit just touches rocks, the jet velocity of the compressed gas is controlled to be around a half of the normal velocity. When the depth of drilling exceeds a first preset value, the normal velocity is recovered, when the depth of drilling reaches a second preset value before a target depth is reached, pressure of the compressed gas is reduced to be around a half of the normal velocity until the target depth is reached through the drilling to stop jetting of the compressed gas, and therefore damage caused by positioning deviation of the drill bit and reverse impact of acting force is avoided.

Description

technical field [0001] The invention relates to the technical field of roller cone drills, in particular to a roller cone drill with controllable compressed gas injection rate. Background technique [0002] The roller cone drilling rig is a kind of drilling equipment, which is mostly used in large open-pit mines. Its function is to perforate the rock and provide mesh for blasting. The roller cone drilling rig in the prior art includes a motor and a reducer, the motor is connected to the reducer, the output shaft of the reducer is a hollow shaft, the hollow shaft is connected with a drill rod, and a drill bit is installed at the end of the drill rod. When the roller cone drill is drilling, it relies on the pressurization and rotation mechanism to pass through the drill pipe to provide sufficient axial pressure and rotation torque to the drill bit. The roller cone drill bit drills and rotates on the rock at the same time, generating static pressure and impact dynamic pressure ...

AI Technical Summary

Problems solved by technology

[0003] However, in the prior art, the rate at which compressed gas is ejected from the drill nozzle is fixed, that is, there are only two states of ejecting compressed air and not ejecting compressed air. However, when drilling is just started or when the hole is very shallow, When the high-speed compressed gas is sprayed on the rock, it will generate force, which will deflect the top of the drill bit, making the drilling position or angle inaccurate; in addition, when the drilling depth has reached the target depth, the impact force generated by the high-speed compressed gas will also cause the drill bit to deflect. shift, affecting the drilling quality

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