How does the loading arm determine left and right?

The loading arm is a special equipment for the loading and unloading of light oil, heavy oil and other chemical liquids in automobiles and train tank cars. The technical and economic performance and operational reliability of the pneumatic crane produced by Hubei Hongyi Electronic&Technology Co., Ltd. are in a leading position in China;

The operator assumed to be on the platform, facing the tank truck, standing on the installed mobile ladder (or facing the tank truck, standing in front of the installed loading arm column),When the loading and unloading arm is on the left side of the person or moving ladder and the loading and unloading arm is in the reset state, the inner and outer arms are on the left side of the column,The rotation direction of this loading arm is determined as a left-handed arm, which is called a left arm; otherwise, it is a right arm.