Multistage-control-based batching weighing control method

Abstract

The invention discloses a multistage-control-based batching weighing control method, and belongs to the technical field of weighing. A batching weighing process is divided into three stages, and different control modes are adopted. The method specifically comprises the following process of rapidly batching any material at the same constant maximum speed when the actual blanking amount is less than or equal to a first-stage weight value in the first stage which is a rapid feeding stage; performing control by using a conventional PID (proportion integration differentiation) controller in the second stage which is an accurate weighing stage; and performing control by using an iterative learning control method, calculating a given closing advance control amount, and correspondingly regulating the feeding speed in the third stage which is a drop prediction stage. According to the method, the problem of conflict between the material batching weighing speed and accuracy is well solved; in addition, the method is independent of changes in the material level of a hopper, random changes in the ratio of materials and the like, and has the advantages of high material batching weighing speed, high accuracy and the like.

Description

technical field [0001] The invention belongs to the technical field of weighing, and in particular relates to a batching weighing control method based on multi-stage control. Background technique [0002] In building materials, cement, metallurgy, medicine, chemical industry and other industries, it is necessary to weigh and batch raw materials, so weighing and batching is an indispensable link in the production process of the above industries. In the production process, whether the raw materials are weighed in strict accordance with the specified ingredient ratio (the ratio of the weight values ​​of various raw materials of the product), and whether the accuracy of the ingredients meets the production index of the product (the ratio of the weight values ​​​​of the various raw materials that make up the product) is a measure of the enterprise's products. The key to quality. Therefore, it is particularly important to control the weight value of each raw material of the produ...

AI Technical Summary

Problems solved by technology

The drop value is affected by the final feeding amount of the feeder and the height from the feeder outlet to the weighing system. The higher the height from the feeder outlet to the weighing system, the greater the drop value. Accuracy is more difficult to control

[0004] In summary, the existing raw material weighing method is difficult to improve the speed accuracy of raw material weighing at the same time, and its final accuracy is affected by the amount of material falling from the feeder to the middle of the weighing hopper after the feeder stops

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