Adjustable profile steel automatic rust removal device and using method

The invention relates to the technical field of rust removal devices, in particular to an adjustable profile steel automatic rust removal device and a using method. According to the technical scheme, the sand blasting derusting machine comprises a transmission guide rail and a feeding rail, a sand blasting derusting device is fixedly installed between the transmission guide rail and the feeding rail, a first cam limiting device is installed at the end of the feeding rail, and a second cam limiting device is installed at the end, close to the sand blasting derusting device, of the feeding rail. A cam limiting part is arranged in the middle of the length of the feeding rail, a fourth cam limiting part is arranged at the end of the transmission guide rail, and a third cam limiting part is arranged at the position, close to the sand blasting derusting device, of the transmission guide rail. According to the adjustable automatic rust removal device for the profile steel, labor resources are saved, the working effi