Crusher

The utility model discloses a crusher, which belongs to the technical field of crushers and comprises a base, a crushing box arranged on the base, a discharge pipeline connected with the bottom of the crushing box, an air bellow arranged on the side surface of the crushing box, a blast wheel arranged in the air bellow, a protective cover arranged above the crushing box and connected with the crushing box through a rotating shaft. A feeding port is formed in the top of the protective cover, screens are arranged on the inner walls of the protective cover and the crushing box, fixing rings are arranged at the two ends of the crushing box, a support is arranged below the fixing rings and connected with the crushing box, the centers of the two fixing rings are located on the same straight line, and a transmission shaft penetrates through the two fixing rings and is connected with an air blowing wheel. Multiple layers of crushing plates are arranged on the outer wall of the transmission shaft; according to the crus