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Flow control method based on non-Newtonian fluid rheological property test system

A technology of non-Newtonian fluid and rheological properties, applied in the field of flow control based on non-Newtonian fluid rheological properties testing system, can solve problems such as insufficient filling, easy wear of filling valve seals, overfilling, etc., to achieve control Real-time, high accuracy of flow control, and the effect of overcoming wear and tear

Active Publication Date: 2021-10-22
HUNAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the viscosity of non-Newtonian fluid is not constant, but depends heavily on temperature, pressure, shear rate, thermal history, strain history, etc., and the control of the machine has delay characteristics, resulting in inaccurate and serious delay in the flow control of non-Newtonian fluid and so on
[0003] For example, the publication number is CN211203034U, and the patent titled "a leak-proof canning valve" uses a technical solution for precise filling using a filling valve to control the flow rate. The filling valve has seals that are easy to wear, complex structure, and low efficiency. Problem; If the filling valve is not used, there will be problems of inaccurate filling measurement such as overfilling or underfilling

Method used

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  • Flow control method based on non-Newtonian fluid rheological property test system
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  • Flow control method based on non-Newtonian fluid rheological property test system

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Effect test

Embodiment 1

[0031] A flow control method based on a non-Newtonian fluid rheological characteristic testing system, comprising the following steps:

[0032] S1: Transmit the online rheological test results to the calculation module built in the flow intelligent control system. The online rheological property test results include shear velocity, shear stress and viscosity, which are obtained by real-time online measurement and calculation of the non-Newtonian fluid online rheological property test system installed on the production equipment or the production equipment with the function of testing the overall flow rate; the flow rate The intelligent control system includes a rheological data acquisition module, a calculation module, a control module and a human-computer interaction module: the rheological data acquisition module completes the data acquisition work of multiple sensors through the driving software, stamps it with a time stamp, and stores it in the real-time database; the contr...

Embodiment 2

[0043] The flow control of the injection machine (the equipment itself can measure the flow in real time) is an important link related to the quality of the final product. Different flow rates should be used in different stages of injection molding: in the initial stage, the melt should pass through the injection channel at a higher speed ;When the melt enters the cavity mouth, in order to prevent injection, the injection speed should be reduced; during the filling process, the injection speed should be accelerated so that the melt can quickly fill the cavity in the stage; when the mold is about to be filled, in order to prevent overfilling and flash , the injection speed should be reduced. Flow control also affects the total injection volume. If the total injection volume is too small, the product will shrink; if the total injection volume is too large, it will cause product flash, excessive product pressure, etc., and even damage the mold.

[0044] The plastic melt is inject...

Embodiment 3

[0058] Filling machine (does not have the function of testing the overall flow rate, but is equipped with an online rheological property testing system) in food (edible oil, blended oil, soybean oil, fruit juice, etc.), daily chemicals (detergent, laundry detergent, hand sanitizer, etc.) , lubricating oil (motor oil, glass water, antifreeze, etc.), condiments (soy sauce, vinegar, very delicious, etc.), drinks (mineral water, white wine, red wine, etc.) and other industries are widely used. In order to accurately control the filling volume and reduce the damage to equipment and instruments caused by the shock and vibration of the pipeline when the valve is suddenly opened and closed, it is necessary to accurately control the flow rate. At present, accurate filling is generally carried out by filling valves, which have problems such as easy wear of seals, complex structures, and low efficiency.

[0059] use as Figure 4 The method shown can realize precise control and real-time...

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Abstract

A flow control method based on a non-Newtonian fluid rheological property test system belongs to the field of flow control of non-Newtonian fluid, and comprises the following steps: S1, an online rheological property test result is transmitted to a built-in calculation module of a flow intelligent control system; S2, the calculation module obtains a real-time rheological characteristic constitutive equation of the material according to the rheological property test result; s3, the calculation module calculates the corresponding relation between the motor current and the non-Newtonian fluid material flow; s4, a flow control mathematical model is obtained according to the corresponding relation in the S3, and the flow control mathematical model is built in a control module; and S5, the control module compares the actual flow fed back with the set flow and adjusts parameters of the mathematical model, so that the flow is rapidly and accurately controlled. The flow of a certain position of production equipment is accurately controlled through movement of the motor, so that the flow control accuracy of non-Newtonian fluid is high, the control is real-time, and the problems that a filling sealing piece of a conventional filling valve is easy to wear, the structure is complex and the efficiency is low are solved.

Description

technical field [0001] The invention relates to the field of flow control of non-Newtonian fluids, and more specifically, designs a flow control method based on a non-Newtonian fluid rheological characteristic testing system. Background technique [0002] There are non-Newtonian fluid transport processes in many processing equipment, such as chemical equipment, food processing equipment, polymer material molding processing equipment, etc. These devices often need to control the flow rate during use. For example, in the injection molding and extrusion molding process of polymer materials, it is necessary to precisely control the flow rate entering the mold to control product quality; , porridge, etc.) during the canning process, it is necessary to accurately and quickly control the instantaneous flow rate to prevent overfilling or underfilling. Because the viscosity of non-Newtonian fluid is not constant, but depends heavily on temperature, pressure, shear rate, thermal hist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N11/08G01N11/12
CPCG01N11/08G01N11/12
Inventor 李祥刚阳志强李德才张志力邓艳李辉孙琳张乾张昌凡
Owner HUNAN UNIV OF TECH
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