The feeding system mainly has the Batching system: including storage bin, hopper scale, weighing module, feeding screw conveyor, aggregate screw conveyor, bucket elevator, mixing screw conveyor, dust collector and so on. The auxiliary materials are respectively sent to the storage bin by truck, and the storage bin is designed according to the material is a mixed batch. The discharge screw is arranged at the lower part of each storage silo to send raw materials into each weighing silo at the lower part to measure various raw materials. The feeding screw is arranged at the lower part of each weighing silo and frequency conversion control is adopted. According to the process of each bin, the raw material weight is set to be uniformly and continuously discharged once, and the discharge amount is calculated and controlled by the weighing difference of each weighing bin. To ensure that the quantity of each discharge is accurate; All kinds of raw materials are uniformly mixed from the weighing bin through the feeding screw into the aggregate mixing screw conveyor, and sent to the mixing screw conveyor by the bucket elevator, and finally into the mixing bin. The start and stop of each bin of batching is manually controlled, and the batching process is fully automated. The batching process is mainly controlled by the PLC control system through the weighing module reading using the difference method to control the discharge amount, and each raw material is accurately and evenly discharged according to the amount set by the process. In order to ensure the uniform mixing of raw materials, the discharge rate is controlled by frequency conversion adjustment at the lower part of each weighing screw. Due to the distance between each bin, there is a time difference between the material flow to the next bin, and it is necessary to ensure that each ingredient is uniformly and continuously covered on the material layer, which is achieved accurately through the automatic control system. All kinds of raw materials are continuously mixed according to the set proportion of the process, and transported to the loading level of the distribution bin. Each dust raising point in the mixing process needs dust removal facilities; To ensure that operators can have a good working environment. The weighing accuracy in the process can reach ±0.5kg, the batching process is fully automatic control according to the process setting parameters, and the operation is safe, stable, accurate and reliable. Good results have been obtained in practical application.

(1) batching process In order to optimize the entire process and improve the mixing uniformity of raw materials, the main improvement of the silo is divided into two silos, both equipped with Weighing modules, that is, the top for the storage bin, the bottom for the final discharge hopper scale. At the end of the discharging part set the time difference, the discharging according to the set value in turn, to ensure that the various materials entering the aggregate screw are uniform discharging, the two silo discharging reduces the discharge of dust, has a great improvement on the entire operating environment, while reducing the loss of raw materials.

(2) Great improvements have also been made in the dust collection equipment, and the split dust collection is more conducive to the classification and treatment of dust, which effectively improves the recovery rate and reduces the intangible loss of raw materials in the batching and mixing process. Each dust point is equipped with a separate pulse bag dust collector, reducing energy consumption, saving power costs, dust collection effect can reach more than 99%, the environmental pollution will be minimal, creating a good working environment.

(3) The screw feed has higher requirements for the main auxiliary materials, and there can be no obvious and large impurities, so as to avoid the screw being blocked to affect the entire dosing process, such as the material must be dry, and there must not be too much water and oil. At the same time, an access port is added to each spiral to prevent the spiral from being blocked.

(4)PLC control system can achieve a high degree of automation, the use of time difference for uniform feeding, requiring the entire system to feed in strict accordance with the requirements, if the main auxiliary materials are too bonded will have a great impact on the accuracy of the system, the use of sensor control can be a good solution to this problem, while improving the degree of synchronization of mixing, The main auxiliary materials can be effectively stirred to improve the accuracy, whether in the discharging screw, the aggregation screw or in the drum mixer.

(5) The addition of circular track and walking trolley makes the ferro molybdenum battering improve the efficiency, the problem is that in the process of lifting the silo, the sand nest tray should be lifted together, on the whole, there are certain unsafe factors and stability, high requirements for personnel operation.

(6) The sand nest tray is all welded, which affects the life to a certain extent, and it is recommended to use cast iron if conditions exist.