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 of an outer periphery of the connecting part is less than a maximum linear distance 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 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 of an outer periphery of the connecting part is less than a maximum linear distance 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 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 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 of the channel bottom gradually increases from the closed side toward the open side.