Sand circulating assembly of steel pipe sand blasting machine

The utility model discloses a steel pipe sand blasting machine sand material circulation assembly which comprises a sand blasting machine, the bottom of the sand blasting machine is connected with a screening box through a supporting column, a first discharging opening is formed in the connecting position of the screening box and the sand blasting machine, a first electromagnetic valve is installed on the first discharging opening, and a rotating shaft is rotatably installed in the screening box. A rotating shaft is fixed to the bottom of the filter screen plate, a connecting rope is fixed to the outer wall of the rotating shaft, a spring telescopic rod is fixed to the bottom of the filter screen plate, the bottom of the spring telescopic rod is fixedly connected with the inner wall of the screening box, and a servo motor is connected to the end of the rotating shaft. And therefore, waste residues in the sand materials can be completely filtered into the impurity collecting box, the filtering precision is gua