In order to determine the actual weight and center of gravity position of the aircraft, and to verify the consistency between the theoretical and actual values of the aircraft's weight and center of gravity, the weighing module must be used to measure the center of gravity of the aircraft before it is delivered after production. By placing Weighing modules and synchronous jacks at the aircraft wheels, adding pads to the weighing modules, and adjusting the aircraft's weighing attitude, the center of gravity can be measured by weighing.

Place weighing modules respectively between the top of the jacks on the left and right wings and the top of the jacks on the rear fuselage and the base at the top starting point to safely and smoothly lift the aircraft and quickly level it to ensure that the longitudinal and transverse directions are in a horizontal state. Record the weight data corresponding to each weighing module; Repeat the above steps and record. The difference in the total weighing data before and after should not exceed 0.5% of the total weight of the aircraft; otherwise, a re-measurement is required. Take the readings at the front top starting point, the left top starting point and the right top starting point of the fuselage. Slowly relieve the pressure and smoothly lower the aircraft, and perform zeroing processing on the equipment.

The power unit of the weighing module, which is lifted synchronously by three hydraulic cylinders, lifts the aircraft wheels from a lower position to a certain height. The multi-hydraulic cylinder synchronous weighing module device adopts a suspended half shaft structure. The hydraulic cylinders placed on the crossbeam first lower the wheels on the weighing module to a lower loading and unloading position above the ground. After loading onto the wheels, the evenly distributed multi-hydraulic cylinders lift and work. Lift the wheels to a higher driving position. The three-cylinder synchronous lifting unit is an important component of this horizontal platform aircraft. The lifting hydraulic system adopts group control, and the control of the hydraulic cylinders is only to adjust the offset in real time by comparing the displacements or speeds of the hydraulic cylinders within each group respectively. PID control regulates the proportional speed control valve and the proportional relief valve to achieve precise control of the two cylinders. A scheme of mixed and coordinated control of pressure and flow.