Contact device of handcart circuit breaker and handcart circuit breaker

A contact device of a handcart circuit breaker, comprising a contact arm and a moving contact,

• a rear end of the contact arm being a pole fixing end, a front end of the contact arm being a contact connecting end, the rear end of the contact arm being provided with a pole fixing structure for being fixed on a fixedly sealed pole of a handcart circuit breaker, and the front end of the contact arm being provided with a moving contact assembling structure for assembling the moving contact,
• wherein:
• the moving contact comprises a contact finger base and a spring contact finger, wherein:
• the contact finger base has a cylindrical structure, inner walls at two ends of which in an axial direction are respectively provided with a contact finger groove, the contact finger grooves at the two ends are respectively provided with the spring contact finger, and the spring contact fingers at the two ends are respectively used for plugging the contact arm and a fixed contact;
• a rear end of the contact finger base is sleeved on the front end of the contact arm, and the contact finger base is provided with more than three support pins extending into an inner cavity of the contact finger base;
• a positioning groove is arranged in a peripheral surface of the front end of the contact arm for sleeving the contact finger base, and the positioning groove is matched with the support pin;
• in an axial direction of the contact arm, a size of the positioning groove is larger than a size of a fitting end of the support pin;
• a diameter of a circle corresponding to the fitting end of each support pin is larger than a diameter of a circle corresponding to a groove bottom of each positioning groove;
• and the contact finger base is connected with the contact arm in a floatable manner through the matching of the support pin and the positioning groove;
• and
• an elastic support structure is arranged between the peripheral surface of the contact arm and the inner wall of the contact finger base, and the elastic support structure is located below the contact device in use to correct downward inclination of a front part of the contact finger base.