Automatic closing type sealing mechanism for ventilation and material leakage prevention of valve bag feed opening

The utility model relates to an automatic closing type sealing mechanism for ventilation and material leakage prevention of a valve bag feed opening, which comprises a sealing cylinder with two open ends, one port of the sealing cylinder is connected with an inner opening cylinder, and the inner opening cylinder is of a flexible ventilation dust filtering structure; the automatic closing type sealing mechanism for ventilation and material leakage prevention of the discharging opening of the valve bag has the advantages that materials are prevented from leaking out of the discharging opening when the materials are filled into the valve bag, and it is guaranteed that the valve bag can be normally exhausted from the discharging opening. 本实用新型涉及一种阀口袋下料口透气防漏料用自动闭合式封口机构，包括两端开口的封口筒，所述封口筒的一个端口上连接有内口筒，所述内口筒为柔性透气滤尘结构；本实用新型一种阀口袋下料口透气防漏料用自动闭合式封口机构，具有在阀口袋填装物料结束时减少物料从下料口处外泄，并且保证阀口袋从下料口处可以正常排气的优点。