Intelligent liquefied natural gas (LNG) tank car loading and unloading sledge and application method thereof

The invention relates to an intelligent liquefied natural gas (LNG) tank car loading and unloading sledge and an application method thereof. The loading and unloading sledge comprises a loading arm and an automatic control system, wherein the loading arm comprises a stand column, a gas-phase inner arm, a gas-phase outer arm, a liquid-phase inner arm and a liquid-phase outer arm; the first end of the gas-phase inner arm is connected with the upper part of the stand column; the second end of the gas-phase inner arm is connected with the first end of the gas-phase outer arm; a gas-phase automatic valve is arranged on the gas-phase inner arm or the gas-phase outer arm; the first end of the liquid-phase inner arm is connected with the lower part of the stand column; the second end of the liquid-phase inner arm is connected with the first end of the liquid-phase outer arm; a liquid-phase automatic valve is arranged on the liquid-phase inner arm or the liquid-phase outer arm; and the automatic control system is elec