Multi-channel loading test system and emergency unloading control method thereof

The invention provides a multichannel loading test system and an emergency unloading control method thereof. The system comprises a force control electric cylinder used for applying loading force; the servo driver is used for driving the electric control cylinder to act; a dual-control framework is formed by a coordinated loading control system and an electric cylinder motion controller, and the coordinated loading control system and the electric cylinder motion controller control a force-controlled electric cylinder through a servo driver. The electric cylinder motion controller calculates position information of a thrust rod of the force-controlled electric cylinder in real time so as to obtain the deformation condition of a test piece under the loaded condition. Calculating the rigidity of the loading part of each test piece under each loading stage according to the relationship between the load borne by the test piece and the deformation, and further obtaining a rigidity curve of the loading part; and whe