Rotary joint electromagnetic locking device and rotary joint

A rotary joint electromagnetic locking device, characterized in that the rotary joint locking device comprises:

• a first electromagnetic sucker provided with a first contact surface;
• a sliding plate disposed on the first contact surface of the first electromagnetic sucker, a first locking member being disposed on the sliding plate;
• a rotary plate corresponding to the sliding plate, the rotary plate being provided with a second locking member at a position corresponding to the first locking member of the sliding plate, the second locking member and the first locking member being capable of locking each other;
• a connecting shaft for sequentially connecting the first electromagnetic sucker and the sliding plate, the connecting shaft being capable of sliding the sliding plate in an axial direction of the connecting shaft, when the first locking member of the sliding plate is locked with the second locking member of the rotary plate, the connecting shaft is capable of restricting rotation of the rotary plate;
• a second electromagnetic sucker disposed with the first electromagnetic sucker in a magnetically isolated way;
• wherein when neither the first electromagnetic sucker nor the second electromagnetic sucker has an adsorption force, the first locking member on the sliding plate and the second locking member on the rotary plate can be locked to each other, when the second electromagnetic sucker has an adsorption force, the rotary plate or the first electromagnetic sucker is adsorbed by the second electromagnetic sucker, so that the first locking component on the sliding plate and the second locking member on the rotary plate are further locked;
• when the first electromagnetic sucker has an adsorption force, the sliding plate can be adsorbed to the first contact surface of the first electromagnetic sucker, so that the first locking member and the second locking member on the rotary plate cannot be locked to each other and are released.