JPH04215021A - Manufacture of tank lorry liquid level measuring apparatus - Google Patents

Abstract

PURPOSE:To enable the simple, accurate marking of liquid quantity graduation onto a measuring bar by recoding a liquid level position measured electrically by a level gage, in correspondence with the filled liquid quantity measured by a flow meter. CONSTITUTION:A level gage 11 is inserted into liquid, filled by the known quantity by a flow meter 10, in the liquid storage chamber 4 of a tank 2. The magnetic field generated by applying a current to a level gage body 12 is agitated by a magnet member 13 sliding on the body 12 and floating on the liquid level by liquid buoyancy so as to generate supersonic waves. The transmission time of this supersonic wave to a measuring part 13 is measured to know the liquid level position, and this liquid level position is recorded, in correspondence with the known liquid quantity, into a recording part. On the basis of this record, the graduation is marked on the specified position of a measuring bar 6. The measuring bar 6 with accurate graduation can be thus obtained in a simple way.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a tank truck liquid level measuring device for measuring the liquid level of a tank truck.

0002

[Prior Art] Dedicated transportation of a wide range of liquids, both hazardous and non-hazardous, such as petroleum products such as gasoline or kerosene, chemical products such as sulfuric acid or caustic soda, animal and vegetable oils such as coconut oil, and food products such as milk. A truck equipped with a tank is usually called a tank truck.

In FIG. 7, for example, a tank truck that transports gasoline, etc. has an elliptical cylindrical shape that can lower the center of gravity to stabilize the vehicle 1, and the interior of the tank 2 is separated from each other by partition plates 3... Liquid storage chamber 4 with a predetermined volume
It is partitioned so that... A manhole 5, a shelter, a side frame, an air safety valve (all not shown), etc. are attached to the tank 2 of this tank truck, with predetermined strength, structure, mounting position, etc. regulated by the Fire Service Act. In particular, in tank trucks that transport gasoline, the amount of gasoline injected into the tank 2 is not strictly measured because the gasoline injected into the tank 2 is injected into the external tank by gravity without using a pump or the like. There must be. Therefore, the amount of liquid in each liquid storage chamber 4 is measured using a measuring device called a measuring rod 6. This measuring stick 6
is normally stored in the lower part of the tank 2, but when measuring, it is inserted into the tank 2 through the manhole 5 of each liquid storage chamber 4, and the amount of liquid stored in each liquid storage chamber 4 is measured. It is designed to measure. This measuring rod has conventionally been engraved with scales in the following manner and is used for measuring liquid volume.

a) Wet the inner surface of the tank with water using a calibration hose, drain the water from the tank, and confirm that no residue remains. b) Set the counter of the flow meter to a predetermined capacity. c) Injecting the amount of water set by the flow meter alternately into each chamber in the order detailed below. At the same time as this predetermined amount is poured, the measuring rod is placed in the tank and a line is drawn. The order of this injection and marking is performed in the order of the numbers assigned corresponding to the respective liquid storage chambers 4, as shown in FIG. For example, a case will be explained in which 500 liters of water is poured into a 14 kiloliter tank. In Fig. 7, each liquid storage chamber 4 is designated as A, B.
, C, D, E, add 500 ml of water to the first room A.
After injecting liters, insert the measuring stick 6 and mark the lines. When performing this marking, first confirm that the water surface in the tank is still after filling the water and draining the water from the hose. In this case, look through the injection port and it is fine if there are no waves. and,
Apply chalk to the ruled surface of the measuring rod 6 with a buff, and
Insert the measuring rod 6 through the measuring hole H, confirm that the tip is in contact with the bottom surface, and then pull out the measuring rod 6. Check and mark the water edge that appears on the buff marks. Repeat this three times while changing the direction of the measuring rod 6, and after confirming that the water edge has not shifted, use a scorer to draw the lines. In this case, the law stipulates that the displacement of the water edge when the direction of insertion of the measuring rod 6 is changed is within 2 mm. In the second step, 500 liters of water is poured into chamber E, and the measuring rod 6 in chamber E is used to draw lines in the same manner. Do the same in the order of room B → room D → room C. When each chamber is filled with 500 liters of water, next pour 500 liters of water into chamber E, which is the farthest from chamber A, and mark the position of the measuring stick 6 corresponding to the capacity of 1 kiloliter. Do a pull. Calibration is performed in the same manner up to the 28th number. d) After completing the calibration of all rooms, drain the water from every other room.
Confirm that there are no leaks from the partition plate. e) After completing the marking, mark the scale on the measuring stick. In addition, Figure 7
Inside, code ``7'' is the bottom valve, and ``8'' is the supply/discharge port.

[0005]

[Problems to be Solved by the Invention] As described above, the manufacturing work of measuring instruments is extremely troublesome because it has to be carried out through various steps, and furthermore, during calibration measurements, it is necessary to manually insert the measuring stick while checking the water edge visually. Since there is also the work of marking 6, there is a possibility that measurement errors may occur in the case of an unskilled person. In addition, in order to carry out calibration measurements three times for each specified scale unit, the work of inserting and pulling out the measuring rod 6 is frequent and takes a lot of man-hours. When injecting water every 500 liters, the measuring rod 6 with a 500 liter scale is used to inject water every 500 liters.
It's also time consuming.

The present invention has been made in view of the above-mentioned actual situation, and eliminates the drawbacks and inconveniences of the prior art, easily measures the relationship between fixed water supply amount and liquid level, and uses a measuring instrument based on this. It is an object of the present invention to provide a method for manufacturing a liquid level measuring device for a tank truck in which a scale is engraved on a measuring rod.

[0007]

[Means for Solving the Problems] The present invention achieves the above object by injecting a known amount into a plurality of mutually independent liquid storage chambers formed by partitioning the inside of a tank with partition plates. Insert a measuring rod into the liquid from the measuring hole in a direction perpendicular to the liquid surface, and measure the amount of liquid injected and the liquid level in each liquid storage chamber based on the position of the wetted surface of the measuring rod. A liquid level measuring device for a tank truck includes a long rod-shaped main body, a magnetic member that slides on the main body and floats on the liquid surface by receiving buoyancy from the liquid, and is attached to the base of the main body. The measurement rod is configured to measure the time it takes for ultrasonic waves generated by the magnet member to disturb the magnetic field generated by passing a current through the main body to the measuring section through the main body. Wait until the liquid level in the liquid storage chamber into which the known amount of fluid has been injected is stabilized, and then insert the level meter designed to measure the length from the tip of the magnet into the liquid through the measuring port. The position measured by this level meter is displayed on the display member of the measuring section, and is recorded by a recording means in correspondence with the value of the flow meter, and based on this record, the measuring rod is set at a predetermined position. This is a method for manufacturing a liquid level measuring device for a tank truck, characterized in that a scale is engraved. Preferably, the recording means is configured to be detachable from the level meter.

[0008]

[Function] In the manufacturing method of the tank truck liquid level measuring device configured as described above, the amount of injected liquid is measured by a flowmeter, and the liquid level of the liquid injected into the liquid storage chamber is measured electrically by a level meter. The system measures accurately the amount of liquid injected, matches the two measured values, and records them using a recording means, so there is no need to insert and remove the measuring rod multiple times into the tank, and it is possible to accurately measure the amount of liquid that corresponds to the amount injected. The surface level can be measured and a predetermined scale can be engraved on the measuring rod from this level meter. In particular, the liquid level can be accurately measured simply by inserting the level meter into the tank from above.
There is no error in measurement values between experienced and unskilled personnel, and an accurate measuring device can be obtained. Furthermore, if the recording means can be used separately from the level meter, only this recording means can be connected to a separate processing device to perform processing calculations.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained in detail below based on embodiments shown in the drawings. FIG. 1 is a schematic diagram showing an embodiment of the present invention,
FIG. 2 is a sectional view of the main part of FIG. 1, FIG. 3 is a front view of the level meter of the same embodiment, FIG. 4 is an explanatory diagram showing the operating principle of the level meter, and FIG. 5 is an explanation showing the processing state after measurement. 7, the same members as those shown in FIG. 7 are given the same reference numerals.

As shown in FIG. 1, the tank lorry has a tank 2 partitioned by partition plates 3 to form a plurality of mutually independent liquid storage chambers 4. A known amount of water is injected into each of these liquid storage chambers 4 as measured by a flow meter 10 (see FIG. 2). The liquid used is
Although water is preferred, it goes without saying that other liquids may be used. The order in which water is injected into each liquid storage chamber 3 is in accordance with the numbers shown in FIG.

First, the level meter 11 is constructed as shown in FIGS. 2 and 3. This level meter 11 includes a long bar-shaped metal body 12, and a float-type magnetic member 13 that is provided to slide on the body 12 and floats on the liquid surface by receiving buoyancy from the liquid. and the main body 12
It has a measuring part 14 attached to the base of. The level meter 11 has a full scale F at a position a predetermined length s from the tip of the main body 12, a 0 point is set near the base end, and the area between 0 and F is the area detected by the magnet member 13 and measured. be.

To summarize the operating principle of this level meter 11, as shown in FIG. When the member 13 is attached, the magnetic field is disturbed at that position, and an oblique magnetic field as shown by the broken line in the figure is generated. Since this twist is a type of vibration, it propagates through the main body 12 at the speed of sound. By measuring the time it takes for this ultrasonic wave to travel through the main body 12 and to the sensor portion 15 of the measuring section 14, the length from the magnet member 13 to the zero point can be measured. The level meter 11 waits until the liquid level in the liquid storage chamber 4 into which the known amount of fluid has been injected becomes stable, and then measures the level in each liquid storage chamber 4.
It is inserted through the measuring hole H provided in...

[0013] However, even if measurements are taken multiple times using the level meter 11, the measurements are not taken out to the outside.
Measurement work will not be troublesome. And level meter 1
The value measured by No. 1 is displayed on the display section 16 of the recording section 17 in the measuring section 14, and is recorded on the recording means 17 in correspondence with the value of the flowmeter 10. This record is performed for each liquid storage chamber 4, and scales are carved at predetermined positions on the measuring rod 6 based on this record. That is, based on the recording means 17, lines are marked at a predetermined position from one end of the measuring stick 6 using a scorer or the like. In this case, there is no need for troublesome work such as changing the direction of the measuring rod 6 to measure, and marking can be easily performed. When the calibration of all the rooms is completed and the data is collected, water is drained from every other room and it is confirmed that there is no leakage from the partition plate 3. Then, after completing the above-mentioned marking, a scale is stamped on the measuring rod 6. It is preferable that this recording means 17 is configured to be detachable from the level meter 11 using a coupler 18 or the like.

[0014] With this arrangement, only the recording means 17 can be taken home to an office or the like, and as shown in FIG. 21, it is possible to launch the ball and to tally up the measurement results.

The measuring rod 6 thus obtained is inserted into each liquid storage chamber 4 of the tank truck, and is used to measure the amount of liquid stored in each liquid storage chamber 4. In addition, the code|symbol "22" in FIG. 1 is a wave-proof plate, "23" is a fire extinguisher, "24" is a handle for a bottom valve, and "25" is a protection frame.

FIG. 6 shows another embodiment of the present invention, in which data for manufacturing a measuring rod 6 is automatically obtained by remote control. In other words, in this embodiment, a water supply header 30 is provided on the tank 2, and a water supply pipe 31 for injecting water into each liquid storage chamber 4 is branched from the water supply header 30, and an air-operated valve 32 and a flow rate are connected to each of these water supply pipes 31. A total of 33 units were installed. By controlling the air-operated valve 32 and the flow meter 33 according to a predetermined order as in the embodiment described above, a predetermined amount of water is injected into each liquid storage chamber 4, and the water level is measured by the level meter 11. In this case, a level meter 11 is provided for each liquid storage chamber 4, and a signal output from each level meter 11 is sent to a relay unit 34.
Alternatively, the C
The PU 37 performs calculations, and the printer 38 displays the results. After the measurement of all the chambers is completed, the water is drained from the partition plate 3 while confirming that there is no leakage, and a scale is stamped on the measuring rod 6 to manufacture the measuring rod 6.

[0017] Although the above-mentioned embodiment describes a tank truck for gasoline, the present invention is not limited thereto. It can be widely applied to things that are divided into sections.

[0018]

As explained above, according to the present invention, the amount of liquid injected is measured by a flowmeter, and the level of the liquid injected into the liquid storage chamber is accurately measured electrically by a level meter. Since the measured values are matched and recorded by the recording means, accurate liquid level corresponding to the injection amount can be obtained without having to insert and remove the measuring rod multiple times into the tank. can be measured and a predetermined scale can be engraved on the measuring rod using the level meter. In particular, since the liquid level can be accurately measured simply by inserting the level meter into the tank from above, there is no error in the measured value by experienced and unskilled personnel, and an accurate measuring device is obtained. be able to. Furthermore, if the recording means can be used separately from the level meter, only this recording means can be connected to a separate processing device to perform processing calculations.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an embodiment of the present invention.

FIG. 2 is an explanatory cross-sectional view of the main part of FIG. 1;

FIG. 3 is a front view of the level meter of the same embodiment.

FIG. 4 is an explanatory diagram showing the operating principle of the level meter.

FIG. 5 is an explanatory diagram showing a processing state after measurement.

FIG. 6 is an explanatory diagram showing another embodiment of the present invention.

FIG. 7 is a schematic explanatory diagram showing a conventional calibration state.

[Explanation of symbols]

2...tank, 3...partition plate,
4...Liquid storage chamber, 6...Measure rod, 10...Flow meter,
12... Main body, 13... Magnet member, 14
...Sensor part, 16...Display member, H...
Measuring port.

Claims (2)

[Claims] [Claim 1] Tank (2) Internal partition plate (3...)
A measuring port (H) is inserted into a known amount of liquid into a plurality of mutually independent liquid storage chambers (4...) formed by partitioning with a flowmeter (10) from a direction perpendicular to the liquid surface. Insert the measuring stick (6) from the
) A liquid level measuring device for a tank truck that measures the amount of liquid injected and the liquid level in each liquid storage chamber (4) according to the wetted surface position of the liquid storage chamber (4). A magnet member (13) that is provided to slide on the main body (12) and floats on the liquid surface by receiving buoyancy from the liquid, and a measuring part (14) attached to the base of the main body (12). The magnet member (13) transmits a magnetic field generated by passing a current through the main body (12)
The magnetic member (13) is measured from the tip of the main body (12) by measuring the time it takes for the ultrasonic waves generated by the disturbance to travel through the main body (12) and to the measuring section (14).
A level meter (11) designed to measure the length up to
a liquid reservoir (4) into which the known amount of fluid is injected;
Wait until the liquid level in the tank becomes stable, then insert the level meter into the liquid through the measuring port (H), and display the position measured by this level meter (11) on the display member (16) of the measuring section (14). At the same time, the recording means (
17), and based on this record, the measuring rod (
6) A method for manufacturing a liquid level measuring device for a tank truck, in which a scale is engraved at a predetermined position. 2. The recording means (17) includes a level meter (
Claim 1 characterized in that the device is detachable from the device (11).
A method for manufacturing a liquid level measuring device for a tank truck as described in .