Muffler mouth rolling machine and durable, long service life of equipment, sealing quickly, not leak, muffler is to prevent sound propagation and allow airflow through a device, is one of the important measures to eliminate the air dynamic noise. Muffler is installed in the air power equipment, such as blower, air compressor, air flow path or the device and reduce the noise in the inlet and exhaust system. Muffler can prevent the spread of sound waves, allowing the airflow through, is an effective tool to control noise.