Negative pressure material tank

The invention discloses a negative pressure material tank comprising a tank body and a gas inlet pipe, a gas inlet disc is arranged in the tank body, a material suction disc is arranged on the inner side of the gas inlet disc, and adjustable fulcrums are fixed to the lower end of the material suction disc. Compared with an existing ordinary material tank, when the negative pressure material tank works, negative pressure is generated in the tank body, dust diffusion can be effectively prevented, the environment is protected, energy and raw materials are saved, the material suction area of a material suction pipe is increased through the material suction disc, the situation that a traditional material tank conducts concentration through gravity and vibration to facilitate material suction is not needed, and the lower portion of the tank body does not need to be made into a slope. When the traditional material tank and the negative pressure material tank occupy the same space, the volume of the lower portion of the traditional material tank is only one fourth of that of the negative pressure material tank, and the gas inlet valve is driven to rotate through a handle. When a notch in the gas inlet pipe is aligned with a notch in the gas inlet valve, the gas inlet amount is the maximum, the gas inlet amount is gradually decreased along with rotation of the gas inlet valve till the gas inlet valve is completely closed, and the gas inlet amount can be adjusted according to the quantity of materials in the tank.