JPH0555809B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a monitoring device for liquid level displacement in a tank installed in a process display device such as a manufacturing plant.

[Prior Art] Conventionally, the displacement of the liquid level in a tank of an oil refining plant or the like has been monitored in the following manner.

Referring to Figure 1, the liquid level 2 of oil in tank 1 is
One end of a wire 4 is connected to a float 3 floating on the ground, and the other end of the wire 4 is wound around a drum 7 via pulleys 5 and 6. The drum 7 rotates according to the rise and fall of the liquid level 2.

A rotation detector 8 detects the direction and amount of rotation of the drum 7 . The detected data is output to the data processing device 9.

This data processing device 9 calculates the remaining amount in the tank, the amount of displacement of the liquid level, the amount of oil reduction, etc. based on the detected data, and outputs the calculated data as the result to the image composition device 10.

This image composition device 10, based on the calculation data,
A simulated image showing the amount of oil in the tank is constructed and a video signal is output to the first CRT device 11.

The simulated image 11A and the remaining amount of oil 11B are simultaneously displayed on the screen of the first CRT device 11.

On the other hand, an imaging camera 12 is placed above the tank 1, an analog imaging signal output from the imaging camera 12 is A/D converted by a signal processing device 13, and the obtained digital signal is sent to an image processing device 14. Output.

The image processing device 14 performs image processing such as contrast enhancement and outputs a video signal to the second CRT device 15.

An actual image of the liquid level is displayed on the screen of the second CRT device 15.

The operator operates the first CRT device 11 and the
The oil storage status in the tank 1 is monitored by observing the screens of each of the 2CRT devices 15.

[Problem to be solved by the invention] However, the above conventional example has the following problems.

A screen for the simulated image/detected value and a screen for the actual image are provided separately.

Therefore, if the float of the liquid level displacement detection means is not in contact with the liquid surface due to an accident and accurate detection is not being performed, if it is determined from the incorrect detected value or simulated image screen, it will cause a serious monitoring error. It turns out.

In addition, when a failure occurs in either of the two image display systems for the actual image or detected value/simulated image,
There is a risk that the screen on which the malfunction has occurred may be overlooked and the malfunction may not be discovered immediately.

The object of the present invention is to detect liquid level displacement that can immediately be found to be incorrect when the float of the liquid level displacement detection means is not in contact with the liquid surface due to an accident and accurate detection is not performed. The objective is to provide a monitoring device.

Another object of the present invention is to provide a monitoring device that can immediately detect failures in the image display systems of both the imaging system and the detection system.

[Means for Solving the Problems] In order to achieve the above object, the present invention is configured as follows.

That is, the present invention provides a liquid level displacement monitoring device that monitors the vertically displacing liquid level in a tank using a screen, which constantly detects the vertical displacement of the liquid level in the tank by raising and lowering a float floating on the liquid surface. a displacement detection means, and a detection value indicating a physical quantity such as a real-time remaining amount of liquid in the tank based on detection data constantly output from the liquid level displacement detection means and basic data such as a volume of the tank stored in advance. a liquid level imaging camera that constantly takes images of the liquid level in the tank and the float; an actual image signal that is constantly output from the liquid level imaging camera is inputted, and the actual image signal that is output from the calculation unit is inputted; An image mixing section which inputs calculated data and adds the real-time actual image signal and real-time calculated data to obtain a mixed video signal; a monitoring screen that simultaneously displays an actual image and a detected value in real time, the liquid level displacement detection means, the calculation section, the image mixing section and the monitoring screen are connected by wire, and the liquid level displacement detection means, the calculation section, the image mixing section and the monitoring screen are connected by wire, A surface imaging camera, the image mixing section, and the monitoring screen are connected by wire.

[Effect] The device according to the invention operates as follows.

Based on detection data constantly output from the liquid level displacement detection means and basic data such as the volume of the tank stored in advance, a physical quantity such as the amount of liquid remaining in the tank in real time is calculated in the calculation section.

The real image signal constantly output from the liquid surface imaging camera is input, and the calculated data output from the calculation unit is input to the image mixing unit, and the real-time real image signal and the real-time calculated data are added to create a mixed video signal. get.

The actual image of the liquid level and the detected value are simultaneously displayed on the monitoring screen in real time by the mixed video signal output from the image mixing section.

[Example] An example of the present invention will be described below with reference to FIG. 2. Components in FIG. 2 denoted by the same reference numerals as in FIG. 1 are the same as in FIG.

A liquid level imaging camera 12 is installed in the upper part of the tank 1. A signal processing device 1 that A/D converts the analog video signal output from the liquid surface imaging camera 12, performs image processing such as contrast enhancement, and then outputs a digital video signal.
3 is provided.

On the other hand, the liquid level displacement detection means connects a float 3 floating on the petroleum liquid level 2 in the tank 1, a wire 4 connected at one end to the float 3, and the other end of the wire 4 connected via pulleys 5 and 6. A drum 7 is wound around the drum 7 to convert the vertical displacement of the liquid level 2 into a rotation direction and rotation amount.
and a rotation detector 8 which converts the direction and amount of rotation of the drum 7 into analog signals and A/D converts the signals.
It is composed of.

The arithmetic unit is configured as a digital arithmetic unit 21,
Based on the real-time digital signal detection data output from the rotation detector 8 and basic data such as the volume and bottom area of the tank 1 stored in advance, physical quantities such as the amount of oil remaining in the tank 1 and the amount of liquid level displacement are determined. Hereinafter, the sensor calculates the detected value and outputs digital calculated data as the result of the calculation.

The image mixing section 22 receives the digital video signal output from the signal processing device 13 as well as the digital calculation data output from the digital calculation section 21, and combines the real-time digital video signal and the real-time digital calculation data. and the resulting digital addition signal is
It is configured to convert into an analog video signal that can be displayed on a CRT screen.

The monitoring screen 23 inputs the video signal output from the image mixing section 22 and monitors the liquid surface imaging camera 12.
The state of the liquid surface imaged by the digital calculation unit 21
The system is configured to simultaneously display in real time the detected values indicating the physical quantities calculated by the sensor.

The liquid surface imaging camera 12, image mixing section 22, and monitoring screen 23 are connected by wire. In addition, a liquid level displacement detection means, a digital calculation section 21 and a monitoring screen 2 are also provided.
3 is connected by wire.

The monitoring device configured above operates as follows.

The liquid level imaging camera 12 constantly photographs the state inside the tank 1, the obtained analog video signal is A/D converted by the signal processing device 13, and the obtained digital video signal is output to the image mixing section 22.

At the same time, a drum 7 around which a wire 4 connected to a float 3 is wound constantly adjusts the vertical displacement of the liquid level 2.
Convert to the rotation direction and rotation amount parameters,
Furthermore, the rotation detector 8 converts this parameter into an electrical digital detection signal.

The digital calculation unit 21 calculates the physical quantities of oil in the tank 1, such as the remaining amount of oil, the amount of liquid level displacement, etc., based on the digital detection signal and basic data such as the tank volume, and the digital calculation data is transferred to the image mixing unit as the calculation result. Output to 22.

The image mixing section 22 adds the real-time digital calculation data and the real-time digital video signal.

Then, an actual image 24 of the liquid level and a detected value 25 indicating the physical quantity of petroleum are simultaneously displayed on the monitoring screen 23 in real time.

The operator can accurately monitor the displacement of the liquid level in the tank just by monitoring one screen.

[Effects of the Invention] According to the invention described above, the following effects are achieved.

When checking the detected value, it is possible to simultaneously check in real time whether the float of the liquid level displacement detection means is properly floating on the liquid surface using the detected value and the actual image on the same screen.

When either of the two systems, imaging and detection, breaks down, the two systems displayed on one image display means.
Since one of the seed images disappears, a failure can be immediately discovered and countermeasures can be taken quickly.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a conventional example. FIG. 2 is a block diagram showing one embodiment of the present invention. 1...Tank, 2...Liquid level, 3...Float,
4...wire, 5,6...pulley, 7...drum,
8... Rotation detector, 12... Liquid level imaging camera, 1
3... Signal processing device, 21... Digital calculation section,
22... Image mixing section, 23... Monitoring screen.

Claims (1)

[Scope of Claims] 1. A liquid level displacement monitoring device that monitors the vertically displacing liquid level in a tank using a screen, which constantly detects the vertical displacement of the liquid level in the tank by the vertical movement of a float floating on the liquid surface. surface displacement detection means, and detection that indicates a physical quantity such as the amount of liquid remaining in the tank in real time based on detection data constantly output from the liquid level displacement detection means and basic data such as the volume of the tank stored in advance. a calculation unit that calculates a value; a liquid level imaging camera that constantly images the liquid level in the tank and the float; and a real image signal that is constantly output from the liquid level imaging camera and which is output from the calculation unit. an image mixing section which inputs calculation data to calculate the liquid level and adds the real-time actual image signal and real-time calculation data to obtain a mixed video signal; a monitoring screen that simultaneously displays an actual image of the float and a detected value in real time; the liquid level displacement detection means, the calculation section, the image mixing section, and the monitoring screen are connected by wire; A liquid level displacement monitoring device characterized in that a liquid level imaging camera, the image mixing section, and the monitoring screen are connected by wire.