L68B1 Mast Section Tower crane crane boom structure, classification, characteristics
tower crane is used for lifting construction of steel bars, wood, scaffolding and other construction materials equipment. The main component to accomplish these tasks is the tower crane boom, which can be divided into pitching jib boom boom and trolley jib boom flat boom tower crane. (1) the Tower Crane with pitch and amplitude swing jib tower crane with pitch and amplitude swing jib tower crane can not achieve pitch and amplitude change by lifting the JIB. Its advantages are: it can give full play to the effective height of the Jib and has simple mechanism; The disadvantage is that the minimum amplitude is limited to about 30% of the maximum amplitude, not completely close to the tower body, load with the lifting arm when the amplitude change, can not carry load amplitude change. The function of the upper slewing tower crane is to support the counterbalance weight, which is used to form the counterbalance moment in the opposite direction to the lifting moment. In addition to the balance weight, the lifting mechanism is often installed at the tail.
L68B1 mast section is the best in this field
The lifting mechanism and the balance weight are placed together at the end of the balance arm, which can play a part of counterweight, and increase the distance between the rope drum and the tower guide wheel, so as to facilitate the wire rope winding and avoid rope disorder. The quantity of the balance weight is inversely proportional to the length of the balance arm, and there is a certain proportion between the length of the balance arm and the length of the lifting arm. The Balance Weight is considerable, light tower crane generally at least 3 ~ 4t, heavy to nearly 30t. (2) Trolley Swing jib trolley swing jib tower crane is operated by trolley mounted on the track of the horizontal boom. Its advantages are: large swing range, the load trolley can approach the tower body, and can carry the load swing Disadvantages are: Boom Force complex, high requirements for the structure, and boom and trolley must be in the upper part of the building, steeple installation height 15-20 meters higher than the building roof.
L68B1 mast section is the best in this field
