CN112146727A - Ultrasonic device for measuring liquid level height of tank truck - Google Patents
Ultrasonic device for measuring liquid level height of tank truck Download PDFInfo
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- CN112146727A CN112146727A CN201910566448.2A CN201910566448A CN112146727A CN 112146727 A CN112146727 A CN 112146727A CN 201910566448 A CN201910566448 A CN 201910566448A CN 112146727 A CN112146727 A CN 112146727A
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- ultrasonic
- tank truck
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/296—Acoustic waves
- G01F23/2962—Measuring transit time of reflected waves
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- Acoustics & Sound (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The invention relates to the technical field of measuring equipment, in particular to a device for measuring the liquid level height of a tank truck by ultrasonic waves, which comprises a microprocessor MCU (microprogrammed control Unit), an LED (light-emitting diode) display screen, an ultrasonic generator, an ultrasonic transmitting circuit, an ultrasonic receiving circuit, an ultrasonic pulse counter and an ultrasonic probe, wherein the ultrasonic probe is placed at a manhole at the top of the tank truck; firstly, ultrasonic waves generated by an ultrasonic generator are transmitted by an ultrasonic transmitting circuit through an ultrasonic probe and reflected by the liquid level in a liquid tank, then the ultrasonic waves are received by an ultrasonic receiving circuit through the ultrasonic probe, an ultrasonic pulse counter is triggered by the ultrasonic transmitting circuit to start counting, the ultrasonic receiving circuit is triggered to finish counting, and a counting output end of the ultrasonic pulse counter and a control end of the ultrasonic generator are respectively connected with a microprocessor MCU. The invention relates to an automatic detection device which is non-contact and pollution-free in the detection process.
Description
Technical Field
The invention relates to the field of liquid level height measurement, in particular to a device for measuring the liquid level height in a tank truck by utilizing ultrasonic waves.
Background
The tank truck is a vehicle for loading and transporting oil materials, is an indispensable transport tool in the industrial development process of China, and can ensure the smooth daily work of people by monitoring the residual quantity of the materials in the tank truck in real time, so that the accurate measurement of the residual quantity of the materials becomes an abnormal key. At present, the more commonly used method for measuring the volume of liquid in a tank truck is as follows: the liquid level height in the tank truck is measured firstly, and then the volume of the liquid is finally obtained by contrasting the corresponding relation between the volume and the height in a volume table of the tank truck. Wherein, because the device of measuring the liquid level height can't be fixed, measurement accuracy is lower. There are many ways in the related art to measure the level of a tank truck, for example, the 'tank truck level gauge' of patent application No. 201320765104.2, in which the principle of a communicating vessel is utilized and a system for communicating and blocking two containers, i.e., a level tube and a tank truck in the gauge, is provided.
The working principle of the measuring instrument is as follows: during measurement, the tank car liquid level height measuring instrument is firstly stretched into tank car liquid, the lower end of the measuring instrument is made to contact the bottom in a tank car, the valve rod is rotated to enable the measuring instrument to move upwards to a certain position through the handle, the valve core at the lower end of the valve rod is far away from the valve seat at the moment, the inside of the liquid level pipe is communicated with the inside of the tank car, the liquid in the tank car can enter the liquid level pipe at the moment until the liquid level height in the two containers is the same, and then the valve rod is rotated reversely to enable the measuring instrument to move downwards through the handle until the valve core and the valve seat are tightly combined into. And finally, taking the tank car liquid level height measuring instrument out of the tank car, and reading the height value of the liquid level in the liquid level pipe, namely the liquid level height in the tank car.
The liquid level height value in the tank truck can not be continuously obtained by the measuring mode, and the liquid level height value is obtained by identifying and reading liquid level scales through naked eyes of people, so certain measuring deviation can occur.
Disclosure of Invention
The invention aims to provide a device for measuring the height of the liquid level in a tank truck by utilizing ultrasonic waves, aiming at the defect of low measurement precision in the conventional device for measuring the height of the liquid level in the tank truck.
The invention adopts the technical scheme that the device for measuring the liquid level in the tank truck comprises a microprocessor MCU (microprogrammed control unit) and an LED (light-emitting diode) display, and also comprises an ultrasonic generator, an ultrasonic transmitting circuit, an ultrasonic receiving circuit, an ultrasonic pulse counter, an ultrasonic probe and a temperature sensor which are arranged in the tank truck; the ultrasonic generator generates ultrasonic waves, the ultrasonic waves are transmitted into the tank truck through the ultrasonic probe after passing through the ultrasonic transmitting circuit to generate liquid level reflection, the reflected ultrasonic signals are received by the ultrasonic receiving circuit through the ultrasonic probe, the ultrasonic pulse counter is respectively connected with the ultrasonic transmitting circuit and the ultrasonic receiving circuit, counting is triggered to start through the ultrasonic transmitting circuit firstly, counting is triggered to end through the ultrasonic receiving circuit, and the counting output end of the ultrasonic pulse counter and the control end of the ultrasonic generator are respectively connected with the microprocessor MCU.
In the invention, the time from the position of the probe to the liquid level can be calculated through the counting value obtained by the ultrasonic pulse counter and the propagation frequency of the ultrasonic wave, in addition, the speed of the ultrasonic wave is a fixed value and can be measured, and the microprocessor MCU can calculate the liquid level height through the two counting values. The automatic detection device is free of contact and pollution in the detection process.
Further, in the above-mentioned device for measuring the level of the liquid in the tank truck: the temperature sensor enters from a tank top population and is arranged in the tank truck, the output of the temperature sensor is connected with the temperature compensation circuit, and the temperature compensation circuit is connected with the microprocessor MCU.
The relationship between the propagation speed of the ultrasonic wave and the temperature can be expressed by the following formula, wherein T is the temperature and the unit is centigrade. The ultrasonic propagation velocity can be corrected using the temperature T measured in real time.
Furthermore, in the device for measuring the liquid level in the tank truck, the ultrasonic transmitting circuit comprises a triode Q1, a resistor R1 and a resistor R2; the ultrasonic pulse signal output by the ultrasonic generator is connected with the base electrode of the triode Q1, the collector electrode of the triode Q1 is connected with a 5V direct-current power supply through a resistor R2, a resistor R1 is connected between the collector electrode and the base electrode of the triode Q1, the emitter electrode of the triode Q1 is grounded, and the transmitting vibrator in the ultrasonic probe is connected between the collector electrode and the emitter electrode of the triode.
This is a relatively simple ultrasonic transmission circuit.
Furthermore, in the device for measuring the liquid level in the tank truck, the ultrasonic receiving circuit comprises an ultrasonic receiving vibrator, a filter circuit and an amplifying circuit; the ultrasonic receiving vibrator receives ultrasonic waves reflected by the liquid level in the tank truck, the ultrasonic waves are amplified by the amplifying circuit, and the ultrasonic receiving vibrator is obtained by utilizing the filter circuit with the center frequency being the ultrasonic frequency generated by the ultrasonic generator.
The present invention will be described in more detail with reference to the following examples.
Drawings
Fig. 1 is a schematic block diagram of embodiment 1 of the present invention.
Fig. 2 is a schematic diagram of an ultrasonic wave transmitting circuit employed in the embodiment 1.
In the figure, 1, an ultrasonic probe, 2, a temperature sensor, 3, a tank truck, 4, a support, 5, a manhole, 6, a support, 7 and a tank top.
Detailed Description
As shown in figure 1, the device for measuring the liquid level in the tank truck comprises a microprocessor MCU (microprogrammed control Unit), an LED (light-emitting diode) display, an ultrasonic generator, an ultrasonic transmitting circuit, an ultrasonic receiving circuit, a temperature compensation circuit, an ultrasonic pulse counter, an ultrasonic probe 1 and a temperature sensor 2, wherein the ultrasonic probe 1 and the temperature sensor 2 are arranged in the tank truck; ultrasonic pulse signals generated by an ultrasonic generator are transmitted by an ultrasonic transmitting circuit through an ultrasonic probe 1 and are reflected by the liquid level generated in a tank truck 3, the ultrasonic pulse signals reflected by the liquid level are received by an ultrasonic receiving circuit after passing through the ultrasonic probe 1, an ultrasonic pulse counter is respectively connected with the ultrasonic transmitting circuit and the ultrasonic receiving circuit, the ultrasonic transmitting circuit triggers counting to start, the ultrasonic receiving circuit triggers counting to end, and the counting output end of the ultrasonic pulse counter and the control end of the ultrasonic generator are respectively connected with a microprocessor MCU. The temperature compensation circuit uses the temperature in the tank car 3 measured by the temperature sensor 2 together with the ultrasonic pulse signal to be transmitted to the processor, where it is calculated using the following formula:
t is temperature in degrees Celsius.
(s) n is the count value of the ultrasonic pulse counter, f is the frequency of the ultrasonic wave, and L is twice the distance between the ultrasonic probe and the liquid level in the tank truck.
The microprocessor MCU can obtain the height of the liquid level in the tank truck by utilizing necessary software to process data.
In the present embodiment, the liquid level height is obtained by measuring the distance traveled by the ultrasonic waves by counting the ultrasonic pulse signals. Therefore, the frequency of the ultrasonic waves has a great influence on the accuracy of the measurement result, and if the required error is less than 0.1mm, the jump of the ultrasonic wave pulse generated by the ultrasonic wave generator in one period is 0.0002 m. The frequency of the ultrasonic wave can be set to 860KHZ according to the propagation speed of the ultrasonic wave in the air of 331.45 m/s. Thus, when the ultrasonic wave reaches our set frequency, the measurement error is considerably small.
In the embodiment, the ultrasonic wave transmitting circuit is shown in fig. 2, and includes a transistor Q1, a resistor R1, and a resistor R2; the ultrasonic pulse signal output by the ultrasonic generator is connected with the base electrode of the triode Q1, the collector electrode of the triode Q1 is connected with a 5V direct-current power supply through a resistor R2, a resistor R1 is connected between the collector electrode and the base electrode of the triode Q1, the emitter electrode of the triode Q1 is grounded, and the transmitting vibrator in the ultrasonic probe is connected between the collector electrode and the emitter electrode of the triode. This is a relatively simple ultrasonic transmission circuit.
In this embodiment, the ultrasonic receiving circuit includes an ultrasonic receiving oscillator, a filter circuit, and an amplifying circuit; the ultrasonic receiving vibrator receives the ultrasonic waves reflected by the liquid level in the tank truck, amplifies the ultrasonic waves by the amplifying circuit, and obtains the ultrasonic signals by utilizing the filter circuit with the center frequency being the ultrasonic frequency generated by the ultrasonic generator.
Claims (7)
1. The utility model provides an utilize ultrasonic wave to measure tank wagon liquid level's device, includes microprocessor MCU and LED display, its characterized in that: the ultrasonic wave generator, the ultrasonic wave transmitting circuit, the ultrasonic wave receiving circuit, the ultrasonic wave pulse counter and the ultrasonic wave probe are arranged at a manhole at the top of the tank truck; the ultrasonic generator generates ultrasonic waves which are transmitted by the ultrasonic transmitting circuit through the ultrasonic probe and reflected by the liquid level in the tank truck, the ultrasonic waves are received by the ultrasonic receiving circuit through the ultrasonic probe, the ultrasonic pulse counter is triggered by the ultrasonic transmitting circuit to start counting and is triggered by the ultrasonic receiving circuit to finish counting, and the counting output end of the ultrasonic pulse counter and the control end of the ultrasonic generator are respectively connected with the microprocessor MCU. Install the ultrasonic measurement device at the tank deck and set up in tank deck people's mouth department, characterized by: the manhole cover further comprises a support and two supports, wherein the two supports are higher than the plane where the top of the manhole is located, and the support is horizontally fixed on the two supports; one end of the ultrasonic measuring device is vertically fixed on the bracket, and one end of the ultrasonic measuring device, which is provided with the temperature sensor and the ultrasonic probe, extends into the manhole.
2. The apparatus for measuring the level of a liquid in a tank truck using ultrasonic waves according to claim 1, wherein: the temperature sensor is arranged at a manhole at the tank top of the tank truck, the output of the temperature sensor is connected with the temperature compensation circuit, and the temperature compensation circuit is connected with the processor.
3. The apparatus for measuring the level of a liquid in a tank truck using ultrasonic waves according to claim 1, wherein: the ultrasonic transmitting circuit comprises a triode Q1, a resistor R1 and a resistor R2; the ultrasonic pulse signal output by the ultrasonic generator is connected with the base electrode of the triode Q1, the collector electrode of the triode Q1 is connected with a 5V direct-current power supply through a resistor R2, a resistor R1 is connected between the collector electrode and the base electrode of the triode Q1, the emitter electrode of the triode Q1 is grounded, and the transmitting vibrator in the ultrasonic probe is connected between the collector electrode and the emitter electrode of the triode.
4. The apparatus for measuring the level of a liquid in a tank truck using ultrasonic waves according to claim 1, wherein: the ultrasonic receiving circuit comprises an ultrasonic receiving oscillator, an amplifying circuit and a filter circuit; the ultrasonic receiving vibrator receives ultrasonic waves reflected by the liquid level in the tank truck, the ultrasonic waves are amplified by the amplifying circuit, and the ultrasonic receiving vibrator is obtained by utilizing the filter circuit with the center frequency being the ultrasonic frequency generated by the ultrasonic generator.
5. The ultrasonic level measurement device of the tank truck as claimed in claim 1, wherein: the two supports are welded on the tank top.
6. The ultrasonic level measurement device of the tank truck as claimed in claim 1, wherein: the support sets up to the support of aluminium material.
7. The ultrasonic level measurement device of the tank truck as claimed in claim 1, wherein: the ultrasonic measuring device is fixed on the bracket through a rivet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910566448.2A CN112146727A (en) | 2019-06-27 | 2019-06-27 | Ultrasonic device for measuring liquid level height of tank truck |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910566448.2A CN112146727A (en) | 2019-06-27 | 2019-06-27 | Ultrasonic device for measuring liquid level height of tank truck |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112146727A true CN112146727A (en) | 2020-12-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910566448.2A Pending CN112146727A (en) | 2019-06-27 | 2019-06-27 | Ultrasonic device for measuring liquid level height of tank truck |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112146727A (en) |
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2019
- 2019-06-27 CN CN201910566448.2A patent/CN112146727A/en active Pending
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20201229 |
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| WD01 | Invention patent application deemed withdrawn after publication |