Rotary Drilling Unit

Description
Rotary drilling unit adopts multi ratio rotary drive which can increase the lifting force greatly and ensures it is large enough when drilling large hole.

Features
1. High stability: equipped with new chassis designed for rotary drilling rig and adopt gravity optimization technology to double the machine stability.
2. Strong drilling ability: The max. drilling depth is 24m (CFA)/56m (Kelly) and the max. pull force is 640kN which break the record and take the leading position in the international market.
3. High efficiency: the originated self-crowding device (CFA) can provide 50kN self-crowding force, which improves the working efficiency when drilling in hard soil and loose pebble layers.

Technical Parameters of Rotary Drilling Unit

Main performances	Unit	CFA equipment	Kelly equipment
Overall	mm	28,058	19,200
Operating weight(including normal Kelly bar)	t	55	56
Max. pile diameter	mm	1,000	1,600
Max. pile depth	m	20(1000)/24(800)	55
Rotary Drive
Max. output torque	kN.m	185	185
Speed of rotation	rpm	7 to 30	7 to 30
Crowd system
Crowd force	kN	50	185
Line pull	kN	/	190
Stroke	mm	17,770	4,250
Main winch
Line pull(1st layer)	kN	4 160	160
Rope diameter	mm	26	26
Max. line speed	m/min	70	70
Auxiliary winch
Line pull(1st layer)	kN	50	50
Rope diameter	mm	14	14
Max. line speed	m/min	60	60
Mast inclination
Forward		3	3
Lateral		5 ±	5

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