Get an arm structure

The utility model discloses a get an arm structure, it includes the back shaft, is fixed in the vertical base plate at the top of back shaft, with vertical substrate connection and can be for the vertical initiative roof beam of the vertical up -and -down motion of vertical base plate, is connected with vertical initiative roof beam and just can gets a mechanism for vertical driven roof beam, sucking disc of taking the initiative the vertical up -and -down motion of roof beam, the sucking disc is got a mechanism and is adorned on the top of vertical driven roof beam, the vertical upward movement of vertical initiative roof beam drives also vertical upward movement of vertical driven roof beam, and vertical driven roof beam also was in the highest point when vertical initiative roof beam was in the highest point, and the sucking disc is got mechanism's action and is realized getting the piece, the sucking disc is got mechanism and is accomplished and get a back, and the vertical downstream of vertical initiati