Pneumatic blocking system for discharging port of melting kiln

The invention discloses a pneumatic blocking system for a discharging port of a melting kiln. The pneumatic blocking system comprises a cross beam support, a pneumatic push rod, a pneumatic push rod installation seat, a connecting rod structure, a push rod and a blocking rod device. The pneumatic push rod installation seat is arranged on the cross beam support, and the pneumatic push rod is arranged on the pneumatic push rod installation seat. The connecting rod structure comprises a connecting frame rod A, a connecting frame rod B and a connecting rod C. One end of the connecting frame rod A and one end of the connecting frame rod B are hinged to the cross beam support, and a plane four-connecting-rod structure is formed by the connecting frame rod A, the connecting frame rod B, the connecting rod C and the cross beam support. A blocking rod is arranged on the connecting rod C. The push rod comprises a connecting rod D and a connecting rod E. One end of the connecting rod D is hinged to the cross beam support. The other end of the connecting rod D is hinged to one end of the connecting rod E. The other end of the connecting rod E is hinged to the middle of the connecting frame rod B. A telescopic arm of the pneumatic push rod is hinged to the middle of the connecting rod E. The pneumatic push rod is connected with a starting switch through an air inlet pipe and an air outlet pipe.