The extrusion automatic Batching system consists of several structurally identical discharging machines and a bucket-shaped mixing chamber. Each Feeding machine is composed of one frequency converter, one feeding motor and one bucket feeding device. The feeding machine is responsible for taking materials from one silo in a fixed quantity and at a constant speed. When batching, different feeding machines simultaneously take materials from different silos at different speeds and put them into the mixing chamber for blending. The batching ratio is achieved by the different feeding speed ratios of different feeding machines, and the length of the feeding time will determine the amount of batching.

The feeding system mainly consists of two Roots blower units, a main feeding pipe and several branch feeding pipes, pneumatic two-branch directional control valves (hereinafter referred to as branch valves) and several cyclone separators. One of the two blowers is a backup blower. Each Roots blower unit consists of one Roots blower, one pneumatic motor and one blower control cabinet. Its task is to generate the compressed air flow required for pneumatic conveying. The blower outlet is connected to one end of the mixing chamber, and the main conveying pipe is connected to the other end of the mixing chamber. In specific applications, The batching system, the fan unit and part of the main material conveying pipe can be installed in the raw material warehouse. The main material conveying pipe leading out from the raw material warehouse is connected to an independent branch valve, and from this, two branch feeding pipes can be formed respectively leading to the two workshops. Similarly, n branch valves can form n+1 branch feeding pipes. At each position (hopper) where these branch pipes pass through each extruder in the workshop, one branch valve is installed. When it is necessary to feed materials to a certain extruder, turn the relevant branch valves to the corresponding direction to ensure that the material conveying channel is unobstructed. The materials can only reach this extruder and not other positions. Then, the fan will blow the air-material mixture in the mixing chamber through each link of the conveying channel to the corresponding cyclone separator. After separation, the materials will reach the hopper of the corresponding extruder.

It should be noted that the characteristics of the raw material preparation and conveying system are as follows: The volume of the bucket-shaped mixing chamber is limited and there is no stirrer inside. The raw materials discharged from each Feeder into the mixing chamber are directly blown away without stirring, and the feeding and conveying are carried out simultaneously. Although the raw materials were not stirred during the distribution process, through ingenious design methods, the uniformity of the raw materials fully met the requirements after being mixed during the feeding process, the mixing caused by the turbulent flow during the blowing process, and the random feeding and mixing when the raw materials were in place and fell into the hopper of the extruder. When it is necessary to supply materials to a certain extruder, there is no need to determine the preparation quantity in advance. During the process of preparing and delivering simultaneously, the system can stop the delivery at any time depending on the specific situation, such as when the hopper is full or there is an urgent task.