Detailed introduction to Tower crane  -QTZ40:

 QTZ40 tower crane, as the
latest model in domestic market at end of 20th century, is a
hydraulic auto-lift tower machine characteristic of upper-circumgyrating,
horizontal arm and variable range with small cabin. The lifting moment is
400KN.m, the independent installation height is 29m, and with attachments the lifting height can reach
120m. The maximum load
is 4t. There are two specifications of work range: 42m, 46.8m, 50m.

  With scientific design, beautiful appearance,
the crane is superior in quality, reasonable in price, safe and reliable in
operation, and easy to maintain and repair. It is an ideal construction machine
for construction enterprises. The machine has four kinds of work structures:
lifting, circumgyrating, variable ranges, and top lifting. The four structures
can work in combination as well as independently so as to improve work
efficiency. The top lifting structure is used to increase the height of the
tower or lower the tower. The lifting structure makes use of tri-speed motor,
with three kinds of speeds: quick, intermediate and slow positioning. For
circumgyrating, wire winding motor speed-adjusting or double-speed motor
speed-adjusting can be selected according to specific requirement so as to
satisfy different demands. The lifting arm can rotate 540º to the left and right.
The circumgyrating and range adjusting are agile and reliable, and the hoisting
positioning is accurate. Thus the crane can satisfy the need for vertical and
horizontal transportation in construction operation.