L68B2 Mast Section Classification of Tower lifting arms
The tower lifting arm is also called a crane arm or an arm frame. The lifting arm is divided into three types: an ARM-type arm frame, a horizontal arm frame, and a folding arm frame.
1. Arm frame
The ARM-type arm frame refers to a device that changes the working range of the hook by changing the inclination of the lifting arm. The arm frame is mainly subjected to axial pressure and depends on changing the tilt angle of the arm frame to achieve the change of the working range of the tower crane. The middle part of the arm frame adopts an equal-section parallel string, and the two ends are trapezoidal or triangular. The middle part of the arm frame is made into a number of standard sections, and a pin shaft or bolt connection is used between the arms frame.
2. Horizontal armband
The horizontal arm frame is mainly used for the variable amplitude tower crane, and the arm frame generally adopts the structural regular triangular section. The upper string of the arm frame is a seamless steel pipe, and the lower string rod adopts two corners of steel and is welded into a square tube, and is also used as the running track of the car. The entire arm frame is a triangular space structure. The abdominal bar, the two side bars and the horizontal bar use a triangular form with a vertical bar. The arm frame is divided into several sections, which are assembled into a whole according to the length of the arm used. The arm frame adopts a double suspension point, a variable section space analysis frame structure, and the arm frame adopts a pin shaft connected to the upper support seat, and is placed in the first section of the lifting arm. Car traction mechanism and suspension hanging basket, The basket is used for installation and maintenance.
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