Small transmission shaft connected with limit switch on transmission device

The utility model discloses a small transmission shaft connected with a limit switch on a transmission device. The transmission device is connected with the limit switch through the small transmission shaft. The small transmission shaft comprises a transmission plate, a bolt, a first nut and a second nut, wherein a plurality of through holes are drilled in the transmission plate, a circular boss is arranged on the lower flat face of the transmission plate, and the transmission plate is connected with the transmission device; the bolt is vertically arranged in the transmission plate in a penetrating mode, a small circular hole is drilled in the center of the head portion of the bolt, a cuboid groove is formed in the bolt, and the head portion of the bolt is connected with the limit switch; the first nut and the second nut are screwed on the bolt and are located on the upper face and the lower face of the transmission plate respectively. By means of the small transmission plate, when the limit switch is installed, a user does not need to adjust the height of the limit switch any more, and both the height and direction of the small transmission shaft can be adjusted; when the direction of the limit switch is not precise, the direction of the limit switch can be adjusted by detaching the small transmission shaft.