Pre-tightening loading device suitable for spacecraft pressing mechanism

A pre-tightening loading device suitable for a spacecraft pressing mechanism comprises one or more pre-tightening loading units and a hydraulic unit for supplying oil to each pre-tightening loading unit for pressurization. Each pre-tightening loading unit comprises a base, a hydraulic oil cylinder, a pressure sensor, a spherical pad seat, a spherical pad and a connecting rod, and the connecting rod can smoothly penetrate through the base, the hydraulic oil cylinder, the pressure sensor, the spherical pad seat, the spherical pad and the connecting rod. A single pre-tightening loading unit is used in cooperation with a single set of pressing mechanism, and one set of pre-tightening loading device can supply oil to the multiple pre-tightening loading units and pressurize the multiple pre-tightening loading units. The device can synchronously apply large-load pre-tightening to a single set or multiple sets of pressing mechanisms, located on the same separation surface, of the separable section or component of the