The empty state of the Marine Loading Arm should balance the inner and outer arms, and the inner and outer arms should have a tendency to return to the non-working state. The balance weight structure can meet this requirement. The oil delivery arm has two balance weights, the main (inner arm weight) and the secondary (external weight), which can achieve static balance.
The principle of the main counterweight balance is the weight of the inner arm, the upper end of the inner arm, the upper sheave and the outer arm, and the heavy moment generated by the lower end main counterweight, the lower sheave and the secondary counterweight. Balance, adjust the weight of the main weight at the lower end of the inner arm to ensure that the inner arm is balanced and has a tendency to return when it is not working.The principle of the secondary counterweight balance is realized by the upper and lower sheave mechanisms. The weight of the outer arm drives the upper sheave to have a torque for reselling in one direction, and the counterweight carries the torque balance of the lower sheave in the opposite direction. The angle of the counterweight to the inner arm (retracting the rope rope) or adjusting the position of the secondary counterweight on the beam (lifting counter weight) ensures that the outer arm is balanced and has a tendency to return when it is not in operation.
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