Limiting mechanism and sampling device

The utility model belongs to the field of water sample collection, and particularly relates to a limiting mechanism and a sampling device. The limiting assembly comprises a rolling shaft frame, a rolling shaft rotationally connected with the rolling shaft frame, an anti-skid gear, an anti-skid buckle rotationally connected with the rolling shaft frame, a sliding piece fixedly connected with the rolling shaft frame and a rope frame, and the fixing assembly comprises a first baffle, a second baffle and a fixing piece fixedly connected with the rolling shaft frame, a water taking assembly, a bag lifting rope and a sampling cup. The hand-cranking device has the advantages that the hand-cranking device is limited and cannot rotate reversely in the taking-back process by arranging the limiting mechanism, the hand-cranking device cannot be limited in the releasing process, and therefore inconvenience caused by sampling overturning is reduced, the device can adapt to and be fixed to different bridge bodies through th