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Main Mechanism And Action Principle of Pneumatic Leg Rock Drill
Jul 23, 2018

Rotary mechanism

According to the different modes of transfer of the rotary torque, the rotary rod mechanism of the rock drill is divided into:

ü Internal rotation

ü external rotation


1. Internal rotary turning

The inner ratchet mechanism is generally used to achieve the rotation of the drill in the piston return phase.

2. Inner ratchet rotating mechanism

During the stroke, the spiral rod rotates and the piston does not rotate; when returning, the spiral rod cannot rotate and the piston rotates.

The common rock drill has a rotation angle of 15°-30° and a rotation speed of 150-200r/min.

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Rock powder and powder discharging method

Drilling: During the rock drilling process, the rock at the bottom of the blasthole is continuously broken into rock powder by the impact of the bit, and it must be removed in time to continue drilling.

Dust generated during rock drilling has a great impact on human health (silicosis), so wet rock drilling is often used.

Central water supply and drainage method.

A first ventilates, B then enters the water.

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Lubrication and lubrication mechanism

(1) Lubrication

Role: reduce friction, prevent rust, keep the gap sealed.

The nature of the lubricant should be:

Ø Suitable viscosity Ø Forming emulsion Ø High oil wax strength Ø High chemical stability, non-toxic and non-corrosive

  (2) Lubrication mechanism

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Propulsion and support mechanism

(1) Air leg structure

It consists of a cross arm, a frame body, a piston, an outer tube, a telescopic tube, a gas pipe, a fork and a handle.

(2) Working principle of air leg

Air leg work is controlled by a pressure regulating valve and a reversing valve.

The pressure regulating valve is used to adjust the thrust of the air leg shaft; the function of the reversing valve is to control the reversing action of the air leg.

ü The legs are extended ü The legs are quickly retracted

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Pressure regulator structure

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