Holding and clamping mechanism, capping device and laboratory automation system

The invention relates to the technical field of medical instruments, and discloses a holding and clamping mechanism, a cover sealing device and a laboratory automation system.The holding and clamping mechanism comprises a base, a clamping jaw assembly and a driving assembly, and the clamping jaw assembly comprises a first clamping jaw and a second clamping jaw which are rotationally arranged on the base; the driving assembly comprises a motor with an output shaft, a first rotating shaft and an elastic coupling, the motor is arranged on the base, the elastic coupling is connected with the first rotating shaft and the output shaft of the motor, and the first rotating shaft rotationally penetrates through the base and is in transmission connection with the first clamping jaw and the second clamping jaw; the motor drives the elastic coupling to drive the output shaft, the first clamping jaw and the second clamping jaw to rotate, so that the first clamping jaw and the second clamping jaw are matched to clamp and f