The upper part of the upright post is hinged with the arm system, and the lower part is installed in the upright post bridge and engaged with the rack oil cylinder in the upright post bridge. The latter pushes the gear on the upright post, and the upright post rotates within the range of 360 ~ 420. The outrigger cylinder supports the frame through the column bridge to ensure the stability of operation.
The arm system consists of main arm, auxiliary arm, telescopic arm (some without telescopic arm) and oil cylinder driving each arm. The pitching motion of the main arm is realized by the main cylinder installed between the main arm and the column. The pitching motion of the auxiliary arm is realized by an auxiliary cylinder installed between the main arm and the auxiliary arm.
Extended data:
Requirements for crane operation stipulate:
1. When an accident happens, the high-pressure hose or tubing in the luffing oil cylinder circuit of the boom bursts or is cut off, the balance valve in the hydraulic circuit works to lock the working oil from the lower cavity of the oil cylinder, so that the boom will not fall down, ensuring the safety of operation.
2. It is installed on the front lower wall panel of the control room. The table lists the rated lifting weight and lifting height under various arm lengths and working ranges, which is convenient for reference during operation. During the lifting operation, the value specified in the table shall not be exceeded.
3. The hoisting indicator is set on the joint side of the basic arm (that is, the right side of the control room), which can be clearly observed by the operator sitting in the control room, and can accurately indicate the elevation angle of the boom and the allowable rated hoisting weight of the crane under the corresponding working conditions.
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