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Dynamic liquid level height measuring device and dynamic liquid level height measuring method as well as closed-loop control system and closed-loop control method

A technology of liquid level height and measuring device, which is applied in liquid level control, non-electric variable control, control/adjustment system, etc., can solve the problems of measurement accuracy, increase device loss, easy damage, etc., and achieve simple and accurate calculation methods. , to ensure the effect of accuracy

Inactive Publication Date: 2014-05-07
ADVANCED TECHNOLOGY & MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the liquid level detection mechanism in this patent is set above the molten steel, and the molten steel temperature is about 1500°C. Although the optical fiber sensor in this patent can withstand a high temperature of about 300°C, it is far from enough. Therefore, in practical applications, The liquid level detection mechanism still needs an external temperature protection device, and high temperature will also affect the measurement accuracy, and increase the loss of the device, shorten its life, and be easily damaged

Method used

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  • Dynamic liquid level height measuring device and dynamic liquid level height measuring method as well as closed-loop control system and closed-loop control method
  • Dynamic liquid level height measuring device and dynamic liquid level height measuring method as well as closed-loop control system and closed-loop control method
  • Dynamic liquid level height measuring device and dynamic liquid level height measuring method as well as closed-loop control system and closed-loop control method

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Effect test

Embodiment 1

[0041] This embodiment provides a dynamic liquid level height measuring device, which includes a container to be measured 4, which is a device for measuring the height of molten steel in this embodiment. Therefore, the container to be measured 4 is a ladle, and the liquid to be measured 5 is molten steel . A float 1 is provided on the molten steel in the container 4 to be tested. One end of the float 1 is set in the molten steel, floats on the molten steel, and floats up and down as the liquid height changes. The other end is connected to a float rod 2. The float rod 2 extends outward through the guide mechanism 3 . The guide mechanism 3 here is made of high-temperature-resistant metal, which passes through the wall of the container to be tested 4 and has a through hole in the middle, and the inner wall of the through hole is smooth. The guiding mechanism 3 moves with the movement of the float 1. The float 1 adopts a refractory material with a density lower than that of the l...

Embodiment 2

[0046] The measurement and calculation method using the dynamic liquid level height measurement device described in Embodiment 1 of the present invention includes the following steps:

[0047] The float rod 2 and the float 1 float on the molten steel, the front end of which protrudes out of the guide mechanism 3 , the light source 9 illuminates the float rod 2 to make the float rod 2 clearer, and the lens 10 will be exposed on the upper part of the guide mechanism 3 The height of the float rod 2 is imaged on the photosensitive element CCD of the camera device 11 , and the camera device 11 transmits the real image formed by the float rod 2 on the photosensitive element CCD to the data processor 13 in real time.

[0048] After the device is installed, it is necessary to calculate the calibration coefficient C under the working conditions at this time, measure the length L0 of the extension section located outside the guide mechanism 3 at this time, and then the data processor 13 ...

Embodiment 3

[0052] In this embodiment, a closed-loop control system is provided, including a container to be tested 4 and a liquid replenishment container. The container to be tested 4 is provided with a liquid to be tested 5 , and the liquid replenishment container is provided with a supplementary liquid. In this implementation, the In practical application of the container to be tested 4 and the liquid replenishment container, the preferred ones are the molten steel ladle to be tested and the liquid replenishment ladle, the liquid is preferably molten steel, the liquid replenishment container is arranged above the container to be tested 4, and the liquid replenishment port of the liquid replenishment container is The plug rod 14 is controlled by the plug rod actuator 15 to open or close, and the liquid replenishment port is aligned with the drainage port 7 in the container 4 to be tested. The drainage port 7 is preferably a funnel-shaped mechanism. The above-mentioned dynamic liquid leve...

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Abstract

The invention relates to a dynamic liquid level height measuring device and a measuring method as well as a closed-loop control system based on the measuring device and a control method. An image of a floater rod which is floated in liquid and is varied in height along the liquid level change is collected in real tine by utilizing a camera system, the image is processed by a data processor in real time to obtain a dynamic height of the floater rod, so that the dynamic measurement of the liquid level height is realized; a PLC (programmable logic controller) control system is connected with the data processor of the dynamic liquid level height measuring device to obtain a variation value of the height of the liquid level to be measured, the PLC control system obtains the control quantity according to the variation value obtained by the data processor and transmits the control quantity to a plug rod actuating mechanism, the plug rod actuating mechanism controls a plug rod according to the control quantity so as to adjust the volume of the liquid flowing into a guide port of a guide mechanism from a liquid supplementing port and to realize the closed-loop control on the liquid level height in a vessel to be measured. The device is simple, the reliability is strong, the measuring and control precision is high, and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of measurement and automatic control, in particular to an on-line automatic measurement sensor for dynamic liquid level height and a closed-loop control system and method. Background technique [0002] In the process of amorphous alloy strip casting, the liquid level height of molten steel in the nozzle bag is one of the key factors affecting the uniformity of the thickness of the amorphous alloy strip in the length direction. In order to obtain a continuous amorphous strip with uniform thickness, it is necessary to The liquid steel level in the nozzle package is accurately measured and controlled. In the prior art, the methods suitable for measuring the liquid level of molten steel mainly include float method, ultrasonic method and ray method. [0003] The float method liquid level measurement is to use the principle of hydrodynamic buoyancy to determine the height of the liquid level by detecting the posi...

Claims

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Application Information

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IPC IPC(8): G01F23/60G05B19/05G05D9/12
Inventor 卢志超李德仁张俊峰刘天成张亮李立军郑太福高昇李广敏王湘粤
Owner ADVANCED TECHNOLOGY & MATERIALS CO LTD
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