Polishing device for constructional engineering

A grinding device for constructional engineering comprises a box body and a first motor, the first motor is fixedly connected to the outer wall of the box body, an output shaft of the first motor is fixedly connected with a lead screw, the outer walls of the two ends of the lead screw are rotationally connected with the box body through bearings, and the outer wall of the lead screw is in threaded connection with a lead screw nut; a fixing mechanism is arranged above the lead screw nut, a dust removal mechanism is arranged above the box body, and a first sliding block is fixedly connected to the lower portion of the lead screw nut. Through cooperation of a support, a second motor, a first clamping plate, an electric telescopic rod and a second clamping plate, the electric telescopic rod drives the second clamping plate to descend, the first clamping plate and the second clamping plate fix a steel pipe, the second motor drives the first clamping plate to rotate, then the steel pipe is driven to rotate, and a g