Multistage-control-based batching weighing control method

A control method and multi-stage technology, applied in the field of weighing, can solve the problems of difficult control of precision, difficulty in improving the speed and accuracy of raw material weighing at the same time, and the influence of the amount of material falling in the air, so as to achieve fast weighing of material batching and solve the problem of material batching Weighing speed and accuracy contradict each other, and the effect of high accuracy

Inactive Publication Date: 2014-08-06
CHONGQING UNIV
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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 sum

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Embodiment Construction

[0034] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods.

[0035] figure 2 It is a schematic diagram of the material batching and weighing structure of the present invention. As shown in the figure, there is a gap distance between the feeder and the weighing bin, which will affect the accuracy of weighing.

[0036] A batching weighing control method based on multi-stage control in the present invention divides the batching weighing process into three stages, and uses different control methods for control. The specific process is as follows:

[0037] The first stage: fast feeding stage, that is, to set the total weight value of weighing and the weight threshold of the first stage. When the actual feeding amount is less than or equal to the weight value of the first stage, any material will be fed at the same constant maximum speed. quick batching;

[0038...

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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...

Claims

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Application Information

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IPC IPC(8): G01G19/38
Inventor 林景栋郑治迦王珺珩马宁吴芳韩冲周宏波徐大发
Owner CHONGQING UNIV
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