JPS60259934A - Discriminating apparatus for liquids - Google Patents

Abstract

PURPOSE:To make safe and dependable liquid discrimination possible, by equipping a light transmission body inside a container, such as a tank and the like, and detecting transmission quantity of light and comparing it with a set value corresponding to the quantity per each kind of liquid. CONSTITUTION:Liquid is contained in a tank chamber and a float 9 floats up to interrupts a passage between optical fiber cables 8 constituting a different circuit and this is detected by a circuit 17, enabling a means 9 for liquid discrimination. An output signal of the reference voltage generating circuit 14 is transmitted to a comparing circuit 19 to operate an electricity-light conversion circuit 15 and to generate an incident ray and further, it is introduced in a light transmission body 7 inside a tank chamber through a cable 8, a portion being reflected and other portion refracted into the liquid and the reflected light reaches a reflecting side plane surface of the body 7, a portion being reflected and the other portion reflected into the liquid and after repetition of these operations, the cable 8 at other end receives it as a irradiant beam of light. The irradiant light is received by the light-electricity convertor 16 and calibrated by a circuit after conversion and a comparing circuit 19 compares difference between the value and the reference level of the incident light and a comparison of a set level basing on this discriminate liquid to be displayed outwardly by an output circuit 21.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid type discriminating device IT in, for example, a tank truck that stores various liquids in a container such as a tank.

Generally speaking, the tank mounted on a tank lorry is divided into multiple tank chambers by partition walls, and several types of oil are loaded separately into each tank chamber at an oil depot and transported to a designated refueling station, depending on each type of oil. - to be able to replenish the storage tank
It has become.

In this way, in a tank truck, multiple oils are loaded in one onboard tank, and there are also multiple storage tanks at the filling station corresponding to the multiple oils, so it is difficult to refuel from the onboard tank to the storage tank. At this time, there were cases where the bottom valve of the installed tank opened due to an error in operating the bottom valve of the oil type different from the oil type in the storage tank, resulting in an oil mixing accident.

The present invention has been made in view of the above, and by focusing on the properties of each oil, it has a simple structure and can automatically identify the oil type when loading, thereby reliably preventing oil mixture accidents. The main purpose of this invention is to provide a liquid type discrimination device, and examples thereof will be described below with reference to the drawings.

Reference numeral 1 denotes a tank lorry, and a tank 6 is mounted on the rear of the vehicle frame 2. The tank 3 is divided into a plurality of tank chambers 5 (
In this example, four rooms) are formed, and a driver's seat 6 is provided in front of the vehicle frame 2.

A roaring light body 7 is disposed near the bottom of each tank chamber 5, and the light transmitting body 7 is secured by appropriate self-binding means, and one end of an optical fiber cable 8 is connected to the upper and lower ends of the light transmitting body 7. The other end of the fiber cable 8 is connected to a determining means 9 in the driver's seat 6. The transparent body 7 is formed by arranging a plurality of triangular prisms in parallel (Fig. 6), but it may also be formed from a plate-shaped glass body as shown in Fig. 5. An optical fiber cable is connected to one side of the transparent body 7 so that light is incident at a suitable angle of incidence, and the other side receives reflected light.

A float 9 floats upward when the liquid is contained in the tank chamber 4, and can interrupt the optical 7-IPA cable 8, which is configured in a circuit separate from the light-transmitting body 7, in the lower part of the float 9. A support body 11 having a balance 10 at its lower end is connected to the support body 11, and a brush 12 for cleaning the parallel surface of the transparent body 7 is provided on the support body 11. It is fitted and guided up and down according to the rise and fall of the liquid level.

Next, the discriminating means 9 will be explained. 14 is a reference voltage generation circuit that generates manual light to the transparent body 7 at a constant voltage k pels, 15 is an electric to optical conversion circuit, and 14 is a semi-permanent pressure generation circuit 1.
Convert the constant voltage generated in step 4 into light input to the transparent body 7,
16 is an optical to electrical conversion circuit that converts the output light (reflected light) from the transparent body 7 into an electrical signal, and 17 is an output voltage calibration circuit that uses the output signal of the optical to electrical conversion circuit 16 to generate a reference voltage. It is calibrated so that it can be compared with the electric signal of the circuit 14, and 17 is a liquid detection circuit that detects the presence or absence of liquid when the circuit is interrupted or conductive due to the rise and fall of the float 9, and outputs an electric signal. This is a zero balance circuit that corrects changes in the amount of transmitted light due to dirt and clouding on the surface of the transparent body 7 due to changes over time, etc. When the liquid detection circuit 17 detects the absence of liquid, the light transmitting body 7 A bias signal is fed back to the reference voltage generation circuit 14 or the output voltage calibration circuit 17 so that the output light of the output light is used as a reference (strike, zero point). Reference numeral 19 is a comparison circuit that compares the input and output light levels of the transparent body 7 using the output signals of the reference voltage generation circuit 14 and the output voltage calibration circuit 17. Reference numeral 20 is a level setting circuit that compares the levels of the input light and output light of the transparent body 7 with the output signals of the reference voltage generation circuit 14 and the output voltage calibration circuit 17. The level is set in advance according to the type of stored liquid such as light oil, and 21 is used to externally display or store the result of determining the liquid type using an output circuit.

Next, the operation of the invention will be explained. First, the level setting circuit 20 sets the level corresponding to the various liquids contained in the tank chamber 5.

When the liquid is contained in the tank chamber 5, the float 9 floats up while cleaning the parallel surface of the transparent body 7 with the brush 12, and when it reaches the upper end of the guide 16, it cuts off the optical fiber cable 8 of another circuit. , this is detected by the liquid detection circuit 17, and the discriminating means 9 is able to discriminate the type of liquid.

The output signal of the reference voltage generation circuit 14 is sent to the comparison circuit 19 and operates the electric-to-optical conversion circuit 15 to generate input light, which is sent to the tank chamber 5 through the optical fiber cable 8.
Input to the transparent body 7 inside.

In the transparent body 7, part of the incident light from the optical fiber couple 8 is reflected by its flat surface, and -m is refracted and enters the liquid. The reflected light reaches the flat part on the opposite side of the light-transmitting body 7, where part of it is reflected again, part of it is refracted and enters the liquid, and the same action is repeated one after another to transmit the light 7 to the other side of the optical cable 8. is received as output light.

Here, since the density differs depending on the type of liquid contained in the tank chamber 5, when the incident light reaches the flat surface of the transparent body 7, the reflectance differs. That is, the refractive index of the liquid with respect to the transparent body 7 is n (n differs depending on the type of liquid), the intensity of the incident light is Jl,
If the intensity of reflected light is J2, reflectance H-J 2'/ J
Because of the relationship 1 = ((n-1) / (n'+2 1))2, the intensity of the reflected light differs depending on the type of liquid, and this is used as output light from the other side of the transparent body 7.
After receiving it in the electrical conversion circuit 16 and converting it into an electrical signal, it is calibrated in the output voltage calibration circuit 17, and the comparison circuit 19 determines the liquid type by comparing the difference with the reference level of the input light and the set level based on this, The output circuit 21 displays or stores the data externally.

Incidentally, the city light body 7 may be used to reflect the light once between the input light side and the output light side, or if it is reflected multiple times, the reflected light may be Since differences in strength tend to occur, it becomes easier to distinguish the liquid type.

In this embodiment, only the transparent body 7 and the float 9 are provided inside the tank 5, and are connected to the discrimination means outside the tank chamber 5 by an optical fiber cable 8.
There are no electrical contacts inside, so even if the liquid contained therein is hazardous, there is no danger at all.

Further, since the float 9 is integrally provided with a brush 12, the transparent body 7 is cleaned each time the liquid is stored and discharged, and errors in the amount of transmitted light are less likely to occur.

As described above, according to the invention, a transparent body is provided in a container such as a tank, and the amount of light transmitted through the transparent body is detected.
By providing a discriminating means for discriminating the liquid type by comparing it with a set value corresponding to the amount of transmitted light for each liquid type, it is possible to safely and reliably discriminate the liquid type.

[Brief explanation of the drawing]

Fig. 1 is an overall view of a tank crawler using the uninvented device, Fig. 2 is an enlarged view of the main parts, Fig. 6 is an operational view of the main parts, and Fig. 4 is an enlarged view of the main parts.
The figure is an overall circuit diagram, and FIG. 5 is a separate operational diagram of the main part on the male side. 6...tank, 7...transparent body, 9...discrimination means 0 Applicant: ShinMaywa T-Sou Co., Ltd.

Claims (1)

[Claims] A light-transmitting body is provided in a container such as a tank, and discriminating means is provided for detecting the amount of transmitted light inside the light-transmitting body and comparing it with a set value corresponding to the amount of transmitted light for each liquid shelf to determine the type of liquid. Liquid type discrimination device.