Spherical element detecting and positioning device for a pebble bed nuclear reactor

A spherical element detecting and positioning device, comprising a pressure-bearing casing, an internal member and an execution part;

• wherein the pressure-bearing casing comprises a tank body, one sphere inlet adapter pipe and two sphere outlet adapter pipes respectively arranged on the tank body;
• one rotor counter-bored hole, one collimating counter-bored hole, one sphere inlet through hole and two sphere outlet through holes are arranged in the tank body;
• the sphere inlet through hole communicates with the sphere inlet adapter pipe, the two sphere outlet through holes correspondingly communicate with the two sphere outlet adapter pipes respectively, and the sphere inlet through hole and the sphere outlet through holes respectively communicate with the rotor counter-bored hole;
• the internal member is arranged in the rotor counter-bored hole, and comprises a lining ring which is a ring structure with a notch, both ends of the lining ring are connected with an arc-shaped limit ring;
• a cross-section of the limit ring is smaller than that of the lining ring, and a rotation gap is provided between an outer surface of the limit ring and an inner surface of the rotor counter-bored hole;
• the limit ring is provided with a sphere inlet hole passage which communicates with the sphere inlet through hole;
• the lining ring is provided with two sphere outlet hole passages that correspondingly communicates with the two sphere outlet through holes respectively;
• the execution part comprises a turntable and two support lugs;
• the turntable is arranged in the lining ring of the internal member and is able to rotate within the lining ring;
• a sphere-passing through hole penetrating in a radial direction is provided in the turntable, and the two support lugs are mounted on the front and back sides of the sphere-passing through hole, and the two support lugs are able to rotate in the rotation gap;
• the two support lugs are both in inverted L shape and opposite to each other, and an isolation space is provided between the two support lugs;
• a side corresponding to the collimating counter-bored hole of the turntable is provided with a thinning groove;
• when the turntable is at a detecting position, a groove bottom surface of the thinning groove is parallel to a bottom surface of the collimating counter-bored hole, and a projected circle of the collimating counter-bored hole on the bottom surface of the thinning groove is enveloped by the groove bottom surface of the thinning groove.