A connector , comprising: a base ; a connecting part , having one end thereof connected to the base ; and a coupling piece , arranged on one other end of the connecting part , the coupling piece comprising a sliding channel , the sliding channel comprising an open end and a closed end that are opposite to each other, the open end being located on one side edge of the coupling piece ; wherein, a maximum linear distance (L2) of an outer periphery of the connecting part is less than a maximum linear distance (L1) of an outer periphery of the coupling piece ; wherein the coupling piece further comprises: a guiding channel , comprising an open side and closed side that are opposite to each other, wherein a direction from the closed side to the open side of the guiding channel is different from a direction from the closed end to the open end of the sliding channel ; characterized in that : the guiding channel further comprises: a first side portion and a second side portion that are opposite to each other, and a channel bottom on a bottom of the guiding channel ; wherein, the closed side and the channel bottom are connected to the first side portion and the second side portion , and a depth (L4) of the channel bottom gradually increases from the closed side toward the open side . a base ; a connecting part , having one end thereof connected to the base ; and a coupling piece , arranged on one other end of the connecting part , the coupling piece comprising a sliding channel , the sliding channel comprising an open end and a closed end that are opposite to each other, the open end being located on one side edge of the coupling piece ; wherein, a maximum linear distance (L2) of an outer periphery of the connecting part is less than a maximum linear distance (L1) of an outer periphery of the coupling piece ; wherein the coupling piece further comprises: a guiding channel , comprising an open side and closed side that are opposite to each other, wherein a direction from the closed side to the open side of the guiding channel is different from a direction from the closed end to the open end of the sliding channel ; characterized in that : the guiding channel further comprises: a first side portion and a second side portion that are opposite to each other, and a channel bottom on a bottom of the guiding channel ; wherein, the closed side and the channel bottom are connected to the first side portion and the second side portion , and a depth (L4) of the channel bottom gradually increases from the closed side toward the open side . a guiding channel , comprising an open side and closed side that are opposite to each other, wherein a direction from the closed side to the open side of the guiding channel is different from a direction from the closed end to the open end of the sliding channel ; characterized in that : the guiding channel further comprises: a first side portion and a second side portion that are opposite to each other, and a channel bottom on a bottom of the guiding channel ; wherein, the closed side and the channel bottom are connected to the first side portion and the second side portion , and a depth (L4) of the channel bottom gradually increases from the closed side toward the open side . a first side portion and a second side portion that are opposite to each other, and a channel bottom on a bottom of the guiding channel ; wherein, the closed side and the channel bottom are connected to the first side portion and the second side portion , and a depth (L4) of the channel bottom gradually increases from the closed side toward the open side . <EOS>