L68B1 Mast Section function of the tower crane tip brief
The function of the tower crane tip is to bear the upper load from the boom pull rope and the balance arm pull rope, and through the Turret, turntable, bearing, and other structural components directly through the turntable to the tower body structure. The top of self-elevating tower has truncated cone column type, forward or backward truncated cone column Type, herringbone frame type and inclined support frame type. The function of the upper slewing tower crane is to support the counterbalance, which is used to form the counterbalance moment in the opposite direction of the lifting moment. In addition to the balance weight, it is often installed in the tail of the lifting mechanism.
L68B1 Mast Section
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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 proportional relationship between the length of the balance arm and the length of the JIB. The Balance Weight is considerable, light tower crane generally at least 3 ~ 4t, heavy to nearly 30t. Tower Crane classification: according to the luffing method can be divided into: 1. Pitch Luffing type. Trolley luffing. According to the mode of operation can be divided into: 1. Jack-up type;. Non-elevating type. According to the way can be divided into: 1. Boom style. Underhand rotation. According to the fixed way can be divided into: 1. Track type; 2. Jellyfish frame. According to the spire structure can be divided into: 1. Crew Cut;. Pointed head. According to the mode of operation can be divided into: 1. Mechanical Automation; 2. Artificial control. The classification of tower cranes: 1. The structural features of the boom can be divided into pitch jib and trolley jib tower crane. The Tower Crane with pitching jib has the advantages that the effective height of the JIB can be fully exerted, the mechanism is simple, and the minimum amplitude is limited to about 30% of the maximum amplitude, can Not be completely close to the tower body, when the load fluctuation with the boom together with the load fluctuation, can not take the load fluctuation. Trolley jib tower crane is mounted on the track of the horizontal boom to achieve the swing of the trolley, its advantages are: a wide range of swing, load trolley can approach the tower body, can take 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.
