Tower Crane QTZ400

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, QTZ400 (TC7052/7550)

With years of experience designing hammerhead tower cranes, Mingwei has created the QTZ400 25T topkit tower crane to meet specific market needs.

Electrical Control System
The 25T construction machinery uses a PLC electrical control system for reliability and safety. The system controls the hoisting mechanism, slewing mechanism and trolleying mechanism and monitors all safety-limit signals. The system self-diagnoses any problems alerts the user to them immediately.

The main electric elements for the hammerhead tower crane are from internationally known brands, such as contactors and circuit-breakers from Schneider in France, PLC controllers from Mitsubishi in Japan, and frequency converters from Yaskawa Electric Corporation in Japan. These components provide the construction tower crane with great overload capacity and a stable performance.

Seventy percent of all tower crane errors are the result of electric failures. However, our hammerhead tower cranes have fewer errors because of our quality electric system design, fitness parameters for special motors, and excellent materials from international brands.

Safety-Protection Devices
Adhering to GB5144 safety regulations for top slewing tower cranes, our cranes are equipped with safety-protection devices such as a moment limiter, overload limit switch, over hoist limit switch, slewing limit switch, trolley limit switch and anemoscope. Our hammerhead tower cranes also have an automatic hook rate-changed device, double-tensile device for trolley wire rope, trip-proof device for climbing, fast-hitch connectors on the slewing mast and jibs or counter-jibs. Each of these ensure the tower crane's safety.

Structure
With our advanced computer software and technology, Mingwei's construction machinery has been developed to have high grade strength, rigidity, and reduced chances of errors or failure. The tower section of the TC7052 tower crane is made of a metal sheet and treated pivots connect the two tower sections. The main standing bar is a square shaped steel tube made from two-angle steels with submerged-arc welding. Reliable and stable, the crane has small wind resistance and good mechanics.

Main Specifications of the Hammerhead Tower Crane

Rated hoisting moment ( kN.m )		4000
Max hoisting moment ( kN.m )		4575
Max height of hoisting (m)		Stationary		73
		Anchorages		200
Working Radius (m)		Min Radius		3.5
		Max Radius		70/75
Max hoisting capacity (t)		Max height of hoisting		≤100m		25
				＞ 100m		12.5
QP2580 Hoisting	Fall	2		4
	Lifting Weight /Speed (t/m/min)	1/80	6.25/53	12.5/40	2/40	12.5/27	25/13.5
	Power (kW)	63
BP110 Trolleying	Speed (m/min)	0 ~ 100
	Power (kW)	11
HPW55B.100 Slewing	Speed (r/min)	0 ~ 0.72
	Power (kW)	3×5.5
Climbing	Working Pressure ( MPa )	31.5
	Speed (m/min)	0.46
Counter-weight	Max Working Radius (m)	70		60		50	40
	Counter-weight (t)	28.5		24		19	14.5
Total Power (kW)		90.5 (Excluding Climbing Mechanism)
Design wind speed at the top of the crane (m/s)		Climbing		14
		In Service		20
		Out Of Service		0 ~ 20m		36
				20 ~ 100m		42
				100m ~		46
Working Temperature ( ℃ )		-20 ~ 40
Main supply		~ 380V/50Hz

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