The Batching system is composed of several Feeding machines with the same structure and a barrel-shaped mixing chamber. Each blanking machine is composed of a frequency converter, a Feeder motor and a rotary hopper feeder, and the blanking machine is responsible for taking material from a bin at a fixed rate. When dosing, different feeding machines take materials from different silo at different speeds at the same time, and put them into the mixing chamber, the proportion of dosing is achieved by the different feeding speed ratio of different feeding machines, and the length of feeding time will determine the amount of dosing.

The feeding system is mainly composed of two Roots blower units, a total feed pipe and a number of branch feed pipes, pneumatic two-branch reversing valves (hereinafter referred to as branch valves) and a number of cyclone separators. One of the two fans is a backup fan, and each Roots blower unit includes a Roots blower, a typhoon electromechanical machine and a fan control cabinet, whose task is to generate compressed air flow required for pneumatic conveying. The fan outlet is connected to one end of the mixing chamber, and the total material delivery pipe is connected to the other end of the mixing chamber. The batching system and part of the fan unit and the total feed pipe can be installed in the raw material warehouse. The total feed pipe from the raw material warehouse is connected with an independent branch valve, which can form two branch feed pipes respectively to two workshops. Similarly, n+1 branch feed pipes can be formed with n branch valves, and these branch pipes are equipped with 1 branch valve at the location (hopper) of each extruder in the workshop. When selected to feed to a extrusion machine, the relevant branch valve is played in the corresponding direction, so that the material can only lead to the extrusion machine and can not go to other locations, so that the fan will mix the air mixture in the mixing chamber through the various links of the feeding channel to blow to the corresponding cyclone separator, after separation, the material reaches the corresponding extrusion machine hopper.

The characteristics of the raw material preparation and conveying system need to be explained that the volume of the barrel mixing chamber is limited, and there is no agitator in it, and the raw materials from each feeder to the mixing chamber are directly blown away without stirring, and while the material is fed, it is transported. Although the raw materials are not stirred in the distribution process, the clever design method makes the raw materials go through the mixing, the mixing of the turbulent flow in the blowing process, and the random mixing when the raw materials fall into the hopper of the extrusion machine, and the uniformity fully meets the requirements. When it is necessary to feed a extrusion machine, it is not necessary to determine the preparation amount in advance, in the process of matching and sending, the system can stop distribution at any time according to the specific situation, such as the hopper has been full or there is an urgent task.