Radiographic inspection apparatus and vehicle-mounted security inspection system

A radiographic inspection apparatus, comprising a scanning device, wherein the scanning device comprises:

• an upright framework;
• a slip ring rotatably provided on the upright framework;
• and
• a locking mechanism, comprising:
• a driving mechanism provided on the upright framework;
• and
• a contact portion provided on the driving mechanism to come into contact with an outer ring of the slip ring under a driving of the driving mechanism, so as to prevent the slip ring from rotating relative to the upright framework,
• wherein the driving mechanism comprises:
• a connecting rod, wherein a first end of the connecting rod is pivotally connected to the upright framework, and the contact portion is pivotally connected between the first end of the connecting rod and a second end of the connecting rod.