Negative pressure system of leaching system

The utility model provides a leaching system negative pressure system which comprises a leacher, a wet meal scraper and an evapo-separated machine, and an anti-explosion pneumatic gate valve is further arranged between the wet meal scraper and the evapo-separated machine. The anti-explosion pneumatic gate valve comprises a valve cabinet, an air cylinder, a piston rod and a gate plate, the air cylinder is arranged above the valve cabinet, and the piston rod and the gate plate are arranged in the valve cabinet; the other end of the piston rod is connected with the flashboard; the cylinder drives the flashboard to move up and down through the piston rod. The device effectively prevents gas of the evapo-separated machine from flowing back, and guarantees the negative pressure of the system; on the basis of a conventional gate valve, the gate valve is subjected to full-sealing improvement, and leakage is effectively eradicated. 本实用新型提供一种浸出系统负压系统，其包括了浸出器、湿粕刮板机、蒸脱机，其中，在湿粕刮板机和蒸脱机之间，还设置有防爆气动插板阀；所述防爆气动插板阀，包括阀柜、气缸、活塞杆、闸