The pneumatic Batching system is mainly composed of three parts: storage bin, feed tank and dispenser. The function of storage bin is to store and provide powder to the feed tank. The external powder is transported to the storage bin with nitrogen through the pipeline, which can generally store 24h of material. The function of the feed tank is to use nitrogen to fluidize the powder and provide the powder to the distributor at the same time, which works in two states: working pressure and atmospheric pressure. The function of the distributor is to use compressed air as a carrier to quantitatively transport powder to the bunker, which can accurately control the feed amount of each pair of spray guns, so as to effectively control the reduction degree and temperature of the bunker.

(1) Storage bin: The upper part of the storage bin is equipped with a cloth bag dust collector with pulse reverse blowing vibration to filter the transported gas; A star-shaped Feeder is set at the lower part to control the unloading speed, and a fluidization device is set on the wall of the silo to improve the fluidity of the powder. The lower fulcrum is equipped with a weighing module to measure the material level of the powder bin, which is reflected in the weighing instrument as a control parameter. The pipe is connected between the storage bin and the feeding tank, and the powder feed to the feeding tank is controlled by the bell valve. The bellow pipe is set on the pipe road to buffer the connecting force and make the storage bin weigh accurately. The maintenance gate valve is set on the pipe road for use in maintenance.

(2) Feed tank: The feed tank is a device between the storage bin and the distributor, and the upper part of the bag dust collector is used to filter the gas during pressure reduction; The bottom center is arranged with a mechanical stirring device and a gas stirring device. When feeding to the distributor, the stirring device starts, so that the powder can enter the distributor smoothly; The mechanical level sensor is set at the bottom to ensure the reliability of the work: when the feeding tank reaches the low level, the feeding request is issued, the pressure relief valve is opened to reduce pressure, and when the pressure reaches the normal pressure, the feeding valve is opened to feed from the storage bin; When the high level is reached, the stop request is issued, the pressure relief valve is closed, the feed valve is closed, and the pressure is increased to the working pressure. In order not to affect the weighing and metering of the distributor, two bell valve is set between the feeding tank and the distributor, and the pipe between the bell valve maintains normal pressure during normal operation, and two sections of bellows are set to isolate the influence of the connecting relay.

(3) Distributor: the distributor is equipped with two mechanical material level sensors. When the material level is low, the weight and measurement are stopped, the feeding request is issued, the conveying tube is pressurized to the working pressure, and then the bell valve is opened to start feeding. When the material level is high, the bell valve is closed, the material pipe is reduced to normal pressure, and the metering is resumed. The bottom is provided with a grid wheel and a stirring device, and the stirring device rotates synchronously with the grid wheel to ensure that the powder can be evenly distributed to the spray gun; The weighing module is arranged on the support of the distributor tank to obtain the information of weight loss, so as to know the instantaneous feed amount. Compared with this amount, the speed of the divider wheel can be adjusted to adjust the feed amount.