Support assembly, protection mechanism, motor assembly, and electronic device

An electronic device, comprising a host and a support assembly, wherein the support assembly comprises a rotating shaft mechanism and a support portion,

• wherein the rotating shaft mechanism comprises a rotating assembly, with the rotating assembly comprising a first fastening piece, a second fastening piece, a connecting piece, and a connection rod assembly, wherein
• the first fastening piece and the second fastening piece are spaced,
• the first fastening piece and the second fastening piece are located on a same side of the connecting piece,
• a first sliding slot is disposed on an end face that is of the first fastening piece and that faces the second fastening piece,
• a second sliding slot is disposed on an end face that is of the second fastening piece and that faces the first fastening piece,
• the connecting piece is rotatively connected to the connection rod assembly, and
• the connection rod assembly can slide along the first sliding slot and the second sliding slot;
• wherein the support portion comprises a first support board, a second support board, and a third support board that are disposed around the rotating shaft mechanism, wherein
• one end of the first support board is fixedly connected to the connecting piece;
• the second support board is located between the first support board and the third support board, and the second support board is rotatively connected to the first support board and the third support board;
• and
• when the first support board rotates around the rotating shaft mechanism, the connection rod assembly slides along the first sliding slot and the second sliding slot, the connecting piece rotates around the connection rod assembly, and the third support board slides along a direction toward or away from the rotating shaft mechanism;
• wherein the host is detachably connected to the first support board in the support assembly.