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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.
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.
Lubrication and lubrication mechanism
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
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
Pressure regulator structure