1. High safety structure and beam; 2. The structure of pulling plate transmission mechanism is simple; 3. Maintenance workload is the lowest; 4. It is convenient and easy to change the filter cloth; 5. Easy inspection and improvement of sludge discharge without dead corner; 6. Safety protection light curtain; 7. Convenient operation; 8. The equipment failure rate is low 9. The head pipe assemble before delivery as a skid.