Aluminum plate strip thickness online detection device for cold rolling unit

The utility model relates to the technical field of clean production and deep processing of aluminum, copper, magnesium and titanium alloy, and discloses an aluminum plate strip thickness online detection device for a cold rolling unit, which comprises a two-roller cold rolling mill and a laser thickness gauge, the laser thickness gauge is positioned in a discharging area of the two-roller cold rolling mill, a pair of oil spraying pipes is arranged in a feeding area of the two-roller cold rolling mill, and the two-roller cold rolling mill is provided with an oil spraying pipe. A pair of mounting blocks is further arranged on a rack of the two-roller cold rolling mill, a guide rod is fixedly arranged between the mounting blocks, bearings are further mounted on the mounting blocks, a lead screw B is mounted in the bearings in a close fit mode, a sliding block is slidably mounted on the guide rod, a threaded through hole is formed in the sliding block, the lead screw B is in threaded connection with the threaded