Distribution Feeding scale adopts process unit, management unit, weighing module and batching control. Weighing consists of a group of Weighing modules, driving devices and other control modules, which complete the basic control activities. The weighing module consists of several controlled weighing units that perform simple tasks. The unit consists of all control weights to complete specific tasks in the production process; The process plant includes all production operations and auxiliary operations in mass production.

The feed is processed according to the sequence and operating parameters specified in the formula. The formulation is executed in real time by the batch actuator and contains all the information related to the product in a particular batch production, including the raw material ratio of the product and the process information for the production of the product. The recipe consists of a title, recipe requirements, procedures, and additional information. The program is the most important part of the formula. The general strategy of product production is specified, including the necessary production operation, sequence and corresponding control requirements. According to the program control model, the program in the formula is divided into four levels from top to bottom: program, unit program, operation and stage.

The mixing scale uses PTA and EG as the main raw materials, and adopts the production process of direct esterification and batch polycondensation. Direct esterification method is to pre-deposit a certain amount of BHET oligomers in the reactor V-201, and first add PTA and EG grout with a certain molar ratio to the esterification reactor V-201 continuously at a certain flow rate, and the reaction is carried out at a clear point. After the esterification reaction, the material was transferred to the polycondensation reactor V-401 for polycondensation reaction.

In the actual control of the batching machine, the measurement of EG and the total amount of slurry are set as a PID control loop, the speed of slurry is controlled by CP (because CP line needs to adjust parameters according to production), the flow direction of slurry is controlled by the automatic batching scale according to the total amount, the relevant control is combined with sequence and interlock, and the preparation of slurry and EG are fully automatic.

Make full use of the advantages of the proportioning scale, the sequence control, interlock control and complex loop algorithm perfectly together, the program will be based on the current state (some important parameters such as internal temperature, water reception, liquid level, etc.) to know the esterification reaction to several steps, and then implement the latest control scheme, so that the process parameters are stable, but also improve the quality of the product.