Screw rod with upper limit switch and lower limit switch

The utility model relates to a screw rod with an upper limit switch and a lower limit switch, which comprises a screw rod upper part and a screw rod lower part which are connected through a threaded rod, a gear I and a gear II are arranged at the end part of the threaded rod, and the gear I is meshed with the gear II; the lead screw is provided with an upper limiting switch and a lower limiting switch, the upper limiting switch comprises a blocking piece, an upper limiting switch assembly and a sliding seat, and the sliding seat is provided with an upper limiting moving rod and a pressing rod; the upper limiting switch assembly comprises an upper limiting microswitch, and the upper limiting microswitch is provided with an upper limiting contact piece; the lower limit switch comprises an ejector rod and a lower limit switch assembly, the lower limit switch assembly comprises a lower limit microswitch and a lower limit moving rod, the lower limit microswitch is provided with a lower limit switch salient point,