Polyester melt viscosity control system and control method thereof

A technology of viscosity control and polyester melt, applied in control/adjustment system, viscosity control, non-electric variable control, etc., can solve problems such as waste, deviation between measured value and actual value, affecting product quality, etc., to improve viscosity control Level, simple structure, good effect

Active Publication Date: 2009-08-19
XINFENGMING GRP HUZHOU ZHONGSHI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this kind of oscillating viscometer is very susceptible to the influence of melt pressure, and the change of pressure will easily cause the deviation between the measured value and the actual value, especially the increase of melt pressure during the melt filter switching cycle will make the detection of the viscometer more accurate. If it is not allowed, it will not only bring great inconvenience to the production process control, but also seriously affect the product quality, and sometimes even make the product fail to meet the process requirements, resulting in great waste

Method used

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  • Polyester melt viscosity control system and control method thereof
  • Polyester melt viscosity control system and control method thereof
  • Polyester melt viscosity control system and control method thereof

Examples

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Effect test

Embodiment 1

[0014] Such as figure 1 As shown, the polyester melt viscosity control system described in the present invention mainly includes an oscillating viscometer 1, a signal input unit 2, a control unit 3, a signal output unit 4 and an actuator 5, and the actuator 5 is arranged on the polyester On the pipeline 8, the oscillating viscometer 1 is connected to the signal input unit 2, and the signal output unit 4 is connected to the actuator 5. The polyester pipeline 8 is provided with a pressure detector 6, a pressure detector 6 and an oscillating viscometer. Viscometer 1 is connected with viscosity correction unit 7 through signal connection, and described viscosity correction unit 7 is the PLC of a Siemens S7300, and there is algorithm program written with ladder diagram in the memory of PLC, and this algorithm program is used to realize function The signal input unit 2 is a Siemens analog input unit SM331, the control unit 3 is a PID regulator, the signal output unit 4 is an analog...

Embodiment 2

[0018] Such as image 3 As shown, the polyester melt viscosity control system described in the present invention mainly includes an oscillating viscometer 1, a signal input unit 2, a control unit 3, a signal output unit 4 and an actuator 5, and the signal input unit 2 It is the Siemens analog input unit SM331, the control unit 3 is Siemens S7300PLC, the signal output unit 4 is the Siemens analog output unit SM332, the actuator 5 is the regulating valve, the oscillating viscometer 1 and the regulating valve are arranged on the polyester pipeline 8, The oscillating viscometer 1 is electrically connected to the PLC through the SM331, the analog signal detected on site is input to the PLC through the analog-to-digital conversion of the SM331, and the PLC is electrically connected to the regulating valve through the SM332, and the polyester pipeline 8 is provided with a pressure detector 6, The pressure detector 6 and the oscillating viscometer 1 are connected with a viscosity corr...

Embodiment 3

[0021] Such as Figure 4 As shown, the polyester melt viscosity control system described in the present invention integrates the signal input unit 2, control unit 3, and signal output unit 4 of embodiment 2 into a DCS system, and the viscosity correction unit 7 formula Put it directly in the DCS controller, where the K value of 0.375 is solidified in the program, P 0 It is detected by the pressure detector 6 in the initial state, P is detected by the pressure detector 6 during the production process, and V 检测粘度 Measured by an oscillating viscometer 1.

[0022] Add the viscosity correction unit 7 formula in the viscosity control program of the DCS controller The oscillating viscometer 1 sends the polyester viscosity detection signal to the DCS computer control system. The DCS computer control system first filters the viscosity detection signal and the pressure signal, and then corrects it by the viscosity correction unit 7 program to eliminate the pressure on the viscosity....

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Abstract

The invention designs a polyester melt viscosity control system, mainly including a vibration-typed viscosity meter, a signal input unit, a control unit, a signal output unit and an actuator; the actuator is arranged on a polyester pipe; the vibration-typed viscosity meter is connected with the signal of the signal input unit; the signal output unit is connected with the actuator signal; a pressure detector is arranged on the polyester pipe; and the pressure detector and the vibration-typed viscosity meter are connected with a viscosity revising unit by signal. The control method of the control system adopts the viscosity signal of the melt in the polyester pipe which is detected by the vibration-typed viscosity meter and the pressure signal which is detected by the pressure detector as the detection signals, corrects the viscosity signal which is detected by the vibration-typed viscosity meter by making use of the relationship between the pressure and the viscosity in the polyester pipe, and uses the revised viscosity signal as a control signal to control the system; and the correction is carried out by a formula V=(1+K*((P-P0) / P0)) V (detection viscosity). The invention effectively eliminates the influence of the pressure fluctuation in the polyester pipe on the measurement of a viscometer.

Description

technical field [0001] The invention relates to chemical fiber equipment and its control method, in particular to a polyester melt viscosity control system and its control method. Background technique [0002] At present, the most important quality control parameter in the production of polyester in the chemical fiber industry is viscosity. The quality of viscosity control largely determines the quality of products, which puts forward high requirements for polyester viscosity detection. The vibration viscometer is only in contact with the melt through the probe, and the amplitude is extremely small, which will not affect the quality of the melt and is not easy to be damaged. Therefore, most online viscosity measurements use the vibration viscometer as a detection tool. But this kind of oscillating viscometer is very susceptible to the influence of melt pressure, and the change of pressure will easily cause the deviation between the measured value and the actual value, especi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05D24/02C08G63/78
Inventor 陆斗平梁松华
Owner XINFENGMING GRP HUZHOU ZHONGSHI TECH CO LTD
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