Special sealing device for xanthating machine

The utility model discloses a sealing device special for a xanthating machine. The sealing device comprises an air cylinder, a connecting rod, a valve block, a sealing device body, a machining groove, a hollow pipe and the like. The device is reasonable and simple in structure, low in production cost, convenient to install and complete in function, the air cylinder is used for driving the valve block to move up and down in the same direction of the connecting rod, the interior of the barrel is switched between a sealed state and a discharging state, the vacuum degree of a xanthating machine in viscose staple fiber production can be kept at a normal level, safety in viscose production is effectively improved, and production efficiency is improved. The maintenance cost is reduced; through the elasticity and plasticity of the sealing device, the reliability of the sealing device is ensured; the lining steel plate enables sufficient tensile strength to be achieved when the screw is fixedly connected with the bott