Oil storage tank measuring equipment

Abstract

The utility model discloses oil storage tank measuring equipment which comprises a main body support, a wheel disc and a guide assembly, a cable ruler belt is wound on the wheel disc, scale marks are arranged on the cable ruler belt, one end of the cable ruler belt is fixed on the wheel disc, and the other end of the cable ruler belt bypasses the guide assembly and is connected with a medium detection sensing device. The medium detection sensing device is used for sensing the liquid level position, the oil-water interface position and the tank bottom platform position in the oil storage tank; a cable electrically connected with the medium detection sensing device is arranged in the cable ruler belt, the end, not connected with the medium detection sensing device, of the cable penetrates through the wheel disc and is electrically connected with an alarm, and the alarm sends out a corresponding alarm signal along with a current medium detected by the medium detection sensing device. The energy supply of measuring the liquid level position, the oil-water interface position and the tank bottom platform position is integrated, the number of carried single-function measuring instruments is reduced, unified operation and management of various measuring data are conveniently achieved, and the digitization and intelligence level of a using unit is improved.

Description

Technical Field

[0001] This utility model relates to the field of industrial metering equipment technology, and in particular to a measuring device for oil storage tanks. Background Technology

[0002] In the large-scale liquid storage and transportation industry, it is necessary to frequently measure parameters such as the gas-liquid interface and oil-water interface height of the liquid inside the tank in order to measure the quality of the transferred liquid. This is especially true in the lubricating oil, fuel oil, and crude oil industries. Due to the high viscosity of the medium, it is difficult for the plumb bob to sink to the bottom platform of the tank. In addition, the high temperature and viscosity of the medium make it difficult to clean. The traditional method of dropping the plumb bob dipstick to the bottom of the tank to measure the actual oil level is difficult in real time. In practical applications, the liquid level is mostly calculated by measuring the empty height. The traditional method of determining whether the liquid level has been touched by the plumb bob dipstick is a rough method such as feeling and whether the liquid surface is shaking, which has a large measurement error. Traditional top-mounted ultrasonic or radar level gauges also have large measurement errors and poor stability when used in the petroleum storage and transportation industry. This is due to factors such as liquid surface shaking, oil mist in the tank, floating roof interference, and guide tube echo interference. The overall performance is difficult to meet the measurement requirements of the petroleum storage and transportation industry. Utility Model Content

[0003] The purpose of this utility model is to provide a measuring device for oil storage tanks to solve the problems existing in the prior art. It integrates the power supply for measuring the liquid level, oil-water interface, and tank bottom platform position, reducing the number of various single-function measuring instruments carried on the upper tank. Moreover, it facilitates the unified calculation and management of multiple measurement data, greatly improving the digitalization and intelligence level of the user unit.

[0004] To achieve the above objectives, the present invention provides the following solution: The present invention provides an oil storage tank measuring device, including a main support, a wheel rotatably mounted on the main support, and a guide assembly spaced apart on one side of the wheel. A flexible cable tape is wound on the wheel, and the cable tape is provided with scale lines to identify its unwinding length. One end of the cable tape is fixed on the wheel, and the other end passes around the guide assembly and is connected to a medium detection sensor. The medium detection sensor is lowered into the oil storage tank along with the cable tape and is used to sense the liquid level, oil-water interface, and tank bottom platform position in the oil storage tank.

[0005] The cable tape contains a cable electrically connected to the medium detection sensor. The end of the cable not connected to the medium detection sensor passes through the wheel and is electrically connected to an alarm. The alarm emits a corresponding alarm signal based on the current medium detected by the medium detection sensor.

[0006] Preferably, a scale pointer is movably provided on the main support, and the scale pointer is close to the cable ruler located at the top of the guide assembly.

[0007] Preferably, the medium detection sensing device includes a gas-liquid interface detection mechanism, which includes a mechanical wave transmitter and a mechanical wave receiver, both electrically connected to the cable. The mechanical wave transmitter and the mechanical wave receiver are arranged opposite each other, and there is a space between them. The mechanical wave receiver is electrically connected to a first connection circuit for collecting changes in the amplitude of the mechanical wave. The first connection circuit is electrically connected to the alarm through the cable.

[0008] Preferably, the medium detection sensing device includes an oil-water interface position detection mechanism, which includes two mutually insulated probes with a gap between them to accommodate the liquid to be tested. The probes are electrically connected to a second connection circuit for collecting the conductivity of the liquid to be tested between the two probes. The second connection circuit is electrically connected to the alarm via the cable.

[0009] Preferably, any one of the probes has a built-in temperature sensor for detecting the liquid to be tested.

[0010] Preferably, the medium detection sensing device includes a tank bottom platform position detection mechanism, the tank bottom platform position detection mechanism includes a tilt sensor, the tilt sensor is electrically connected to a third connection circuit for collecting the signal it emits, and the third connection circuit is electrically connected to the alarm through the cable.

[0011] Preferably, the alarm includes a buzzer, an LED light, and a display screen. The buzzer emits a buzzing sound at a corresponding frequency to the liquid level, the oil-water interface, and the tank bottom platform. The LED light flashes at a corresponding frequency to the liquid level, the oil-water interface, and the tank bottom platform. The display screen displays corresponding medium information to the liquid level, the oil-water interface, and the tank bottom platform.

[0012] Furthermore, the buzzer, the LED light, and the display screen are all electrically connected to the first connection circuit, the second connection circuit, and the third connection circuit.

[0013] Preferably, the wheel is equipped with an anti-disengagement self-locking mechanism, which includes a self-resetting locking pin and multiple locking holes. The locking holes are opened on the main support and are evenly spaced around the outer periphery of the wheel's rotation center. The locking pin is installed on the wheel and is inserted into the corresponding locking hole when the wheel is released from the hand.

[0014] Preferably, the medium detection sensing device includes a measuring rod, the top end of which is connected to the cable tape, and the bottom end of which is used to install the gas-liquid interface detection mechanism, the oil-water interface position detection mechanism, and the tank bottom platform position detection mechanism.

[0015] The main support is provided with a vertically extending protective tube with open ends. The protective tube has a limit hole and at least two locking holes at the same height position. Each locking hole is equally spaced along the circumference of the protective tube. The limit hole is located between two locking holes.

[0016] A locking ring is coaxially rotatably sleeved on the outer peripheral wall of the protective tube. The locking ring is provided with a plurality of spring beads that correspond one-to-one with the limiting hole and each of the locking holes. Each spring bead rotates synchronously with the locking ring. After the spring bead corresponding to the locking hole rotates into position, it passes through the locking hole and abuts against the outer peripheral wall of the measuring rod. After the spring bead corresponding to the limiting hole rotates into position, it is fitted into the limiting hole and is spaced apart from the measuring rod.

[0017] Preferably, the protective tube contains a cable cleaning device located above the measuring rod. The cable cleaning device includes at least two scrapers, one end of which is connected to the inner wall of the protective tube, and the other end extends horizontally and abuts against the two sides of the cable tape.

[0018] The present invention achieves the following technical advantages over the prior art:

[0019] This invention involves installing a medium detection sensor at the free end of a cable tape. In use, the main support is manually lifted to the metering port on the top of the oil tank. A rotating wheel lowers the sensor into the tank to measure the liquid level, oil-water interface, and tank bottom platform. When different interfaces are detected, an alarm signal of different frequencies is emitted. After fine adjustment, the corresponding interface position is accurately monitored, and the current interface height is read from the scale on the cable tape. The entire device integrates the power supply for measuring the liquid level, oil-water interface, and tank bottom platform, reducing the number of single-function measuring instruments carried on the tank. It also facilitates unified calculation and management of multiple measurement data, significantly improving the digitalization and intelligence level of the user unit. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure in one embodiment of the present invention;

[0022] Figure 2 for Figure 1 A schematic diagram of the structure on the other side;

[0023] Figure 3 This is a schematic diagram of the cable cleaning device in one embodiment of the present invention;

[0024] Among them, 1-main support, 2-handle, 3-measuring rod, 4-protective tube, 5-cable tape, 6-mechanical wave transmitter, 7-probe, 8-mechanical wave receiver, 9-wheel, 10-guide wheel, 11-spring ball, 12-locking ring, 13-manual crank, 14-buzzer, 15-LED light, 16-scale pointer, 17-cable, 18-anti-disengagement self-locking mechanism, 19-display screen, 20-scraper. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] The purpose of this utility model is to provide a measuring device for oil storage tanks to solve the problems existing in the prior art. It integrates the power supply for measuring the liquid level, oil-water interface, and tank bottom platform position, reducing the number of various single-function measuring instruments carried on the upper tank. Moreover, it facilitates the unified calculation and management of multiple measurement data, greatly improving the digitalization and intelligence level of the user unit.

[0027] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] like Figures 1 to 3As shown, this embodiment provides a measuring device for oil storage tanks, which is mostly used for measuring large oil storage tanks. It includes a main support 1, a wheel 9 rotatably mounted on the main support 1, and guide components spaced apart on one side of the wheel 9. Preferably, the main support 1 is provided with a handle 2 to facilitate lifting the main support 1 and moving it to the measurement location. The wheel 9 is provided with a manual crank 13 to facilitate manual rotation of the entire wheel 9 by the operator. A flexible cable tape 5 is wound onto the wheel 9. The cable tape 5 has graduations to identify its unwinding length, and one end of the cable tape 5 is fixed to the wheel. On the disc 9, the other end bypasses the guide assembly and is connected to a medium detection sensor. Preferably, the guide assembly is a guide wheel 10, which extends along the axis of the disc 9. The medium detection sensor is lowered into the oil storage tank along the cable tape 5 and is used to sense the liquid level, oil-water interface, and bottom platform position in the oil storage tank. The cable tape 5 contains a cable 17 electrically connected to the medium detection sensor. The end of the cable 17 not connected to the medium detection sensor passes through the disc 9 and is electrically connected to an alarm. The alarm emits a corresponding alarm signal based on the current medium detected by the medium detection sensor. This invention utilizes a medium detection sensor installed at the free end of a cable ruler 5. In use, the main support 1 is manually lifted to the metering port on the top of the oil tank. The sensor is lowered into the tank by cranking a wheel 9 to measure the liquid level, oil-water interface, and tank bottom platform. When different interfaces are detected, an alarm signal of different frequencies is emitted. After fine adjustment, the corresponding interface position is accurately monitored. Specifically, the cable ruler 5 is moved up and down according to the alarm signal to find the critical point, which is the interface. The current interface height is then read from the scale on the cable ruler 5. The entire device integrates the power supply for measuring the liquid level, oil-water interface, and tank bottom platform, reducing the number of single-function measuring instruments carried on the upper tank. It also facilitates unified calculation and management of multiple measurement data, greatly improving the digitalization and intelligence level of the user unit. Furthermore, the entire device adopts an intrinsically safe explosion-proof design, and can also be used for measuring flammable liquids.

[0029] The advantages of this device lie in its portability and direct, intuitive measurement, with a clear and unambiguous interface. Because it provides clear indication signals such as alarm signals of different frequencies, it eliminates the need to apply oil or water testing paste to the cable ruler, avoiding measurement errors caused by water and oil creep. It also avoids measurement errors caused by human error based on intuition, which can lead to differences in the residence time of the testing paste at the corresponding interfaces. Furthermore, the device's portability greatly facilitates calibration and verification, ensuring measurement accuracy, and it is easy to maintain and repair.

[0030] Preferably, an energy storage battery is built into the main support 1 to power the system, thus avoiding the slip ring structure in the electrical path and improving system safety.

[0031] In one specific embodiment, a scale pointer 16 is movably mounted on the main support 1. The scale pointer 16 is positioned close to the cable tape 5 located at the top of the guide assembly, allowing for quick reading of the scale on the cable tape 5 to obtain the current interface height. Furthermore, the scale pointer 16 is movably mounted on the main support 1, specifically capable of horizontally adjusting along the direction of the cable tape 5's extension to compensate for zero-position offset of the cable tape 5 caused during production or use.

[0032] In one specific embodiment, the medium detection sensing device includes a gas-liquid interface detection mechanism. This mechanism includes a mechanical wave transmitter 6 and a mechanical wave receiver 8, both electrically connected to cable 17. The mechanical wave transmitter 6 and receiver 8 are positioned opposite each other, with a space between them. The mechanical wave receiver 8 is electrically connected to a first connection circuit for acquiring changes in the amplitude of the mechanical wave. This first connection circuit is electrically connected to an alarm via cable 17. Specifically, the gas-liquid interface detection mechanism utilizes the attenuation amplitude of mechanical waves propagating in gas and liquid media. The same method is used to detect the gas-liquid interface position. Since the mechanical wave transmitter 6 and the mechanical wave receiver 8 are distributed opposite each other and there is an air gap between them, the mechanical wave transmitter emits a mechanical wave of a certain amplitude during measurement. The mechanical wave passes through the air gap and is received by the mechanical wave receiver 8. When the medium filling the air gap changes from gas to liquid, the waveform amplitude received by the mechanical wave receiver 8 changes significantly. The first connection circuit collects the amplitude change to determine the gas-liquid interface position, and then sends this signal to the alarm so that the alarm emits an alarm signal of the corresponding frequency.

[0033] In one specific embodiment, the medium detection sensing device includes an oil-water interface position detection mechanism, which comprises two mutually insulated probes 7, preferably metal probes 7. A gap is formed between the two probes 7 to accommodate the liquid to be tested. The probes 7 are electrically connected to a second connection circuit for collecting the conductivity of the liquid between the two probes 7. The second connection circuit is electrically connected to an alarm via a cable 17. During measurement, the gap between the two probes 7 is filled with the liquid to be tested. The second connection circuit accurately locates the oil-water interface by acquiring the conductivity of the liquid between the two probes 7. This method can also effectively detect the thickness of the emulsion layer around the oil-water interface. Furthermore, the precise value of the oil-water interface conductivity is used to determine the oil-water interface position, rather than relying on a switch-like detection of "conduction" or "non-conduction," thus improving detection accuracy and the ability to identify the thickness of the emulsion layer at the oil-water interface.

[0034] In one specific embodiment, any probe 7 has a built-in temperature sensor for detecting the liquid to be tested, which can detect the temperature of the surrounding liquid in real time during the measurement process.

[0035] In one specific embodiment, the medium detection sensing device includes a tank bottom platform position detection mechanism, which includes a tilt sensor. The tilt sensor is electrically connected to a third connection circuit for collecting its emitted signal. The third connection circuit is electrically connected to an alarm via cable 17. Specifically, after the entire medium detection sensing device is lowered to the tank bottom platform position, it will tilt. The tilt angle is detected by the tilt sensor, and the corresponding tilt angle information is obtained through the third connection circuit, thereby detecting whether the medium detection sensing device has reached the tank bottom platform position.

[0036] In one specific embodiment, the alarm includes a buzzer 14, an LED light 15, and a display screen 19. The buzzer 14 emits a buzzing sound at the corresponding frequencies for the liquid level, the oil-water interface, and the tank bottom platform. The LED light 15 flashes at the corresponding frequencies for the liquid level, the oil-water interface, and the tank bottom platform. The display screen 19 displays the corresponding medium information for the liquid level, the oil-water interface, and the tank bottom platform. Furthermore, the buzzer 14, the LED light 15, and the display screen 19 are all electrically connected to the first connection circuit, the second connection circuit, and the third connection circuit. The buzzer 14 and the LED light 15 are used to detect the liquid level, the oil-water interface, and the tank bottom platform in the entire medium detection sensing device. When the position is detected, different frequencies of audible and visual alarm signals are emitted, and the corresponding information is displayed in text form on the display screen 19. Specifically, since the audible alarm signal emitted by the buzzer 14 and the light alarm signal emitted by the LED 15 are synchronized, the frequency of the audible and visual alarm signals changes synchronously and can be regarded as the audible and visual frequency. When air is detected, the audible and visual frequency is 1Hz, and the display screen 19 displays "Air". When the gas-liquid interface is detected, the audible and visual alarm frequency is 2Hz, and the display screen 19 displays "Liquid Level". When the oil-water interface is detected, the audible and visual alarm frequency is 3Hz, and the display screen 19 displays "Water Level". When the position of the tank bottom platform is detected, the audible and visual alarm becomes a continuous sound, and the display screen 19 displays "Tank Bottom".

[0037] In one specific embodiment, the wheel 9 is equipped with an anti-dislodgement self-locking mechanism 18. The anti-dislodgement self-locking mechanism 18 includes a self-resetting locking pin and multiple locking holes. The locking holes are opened on the main support 1 and are evenly spaced around the outer periphery of the rotation center of the wheel 9. The locking pin is installed on the wheel 9 and is inserted into the corresponding locking hole after the wheel 9 is released, so as to prevent the wheel 9 from rotating freely after the wheel 9 is released, thereby preventing the medium detection sensor from falling due to gravity. As a preferred embodiment of this utility model, the wheel 9 is divided into a winding part and a driving part along its axial direction. The winding part and the driving part are located on both sides of the main support 1, respectively. The cable tape 5 is wound on the winding part. A display screen 19, a buzzer 14 and an LED light 15 are installed at the middle position of the end face of the driving part away from the winding part. A hand crank is installed at its outer periphery. In use, the main support 1 is lifted to the metering port on the top of the tank by hand, and the medium detection sensor is lowered into the tank by hand crank. Each lock hole is located on the side of the main body bracket 1 near the drive unit, and the lock pin is mounted on the drive unit.

[0038] In one specific embodiment, the medium detection sensing device includes a measuring rod 3, the top end of which is connected to a cable tape 5, and the bottom end of which is used to install a gas-liquid interface detection mechanism, an oil-water interface position detection mechanism, and a tank bottom platform position detection mechanism. A vertically extending protective tube 4 with open ends is provided on the main support 1. Limiting holes and at least two locking holes are provided at the same height position on the protective tube 4. The locking holes are evenly spaced along the circumference of the protective tube 4, with the limiting holes located between the two locking holes. A locking ring 12 is coaxially rotatably sleeved on the outer peripheral wall of the protective tube 4. The locking ring 12 has multiple parts that correspond one-to-one with the limiting holes and each locking hole. The corresponding spring beads 11 rotate synchronously with the locking ring 12. After the spring bead 11 corresponding to the locking hole rotates into position, it passes through the locking hole and abuts against the outer peripheral wall of the measuring rod 3, so that the measuring rod 3 can be fixed by the spring beads 11. This avoids the measuring rod 3 from easily shaking and colliding with the protective tube 4 during the transfer of the entire device, which would reduce the service life of the sensor components installed on the measuring rod 3. After the spring bead 11 corresponding to the limiting hole rotates into position, it is fitted into the limiting hole and is spaced apart from the measuring rod 3, so that the locking ring 12 can be identified to be in position by the cooperation between the limiting hole and the spring bead 11. Preferably, the inner peripheral wall of the locking ring 12 is provided with an annular groove. The spring bead 11 includes a spring structure, one end of which is connected to the inner wall of the annular groove, and the other end is connected to the bead structure.

[0039] In one specific embodiment, the protective tube 4 contains a cable cleaning device located above the measuring rod 3. The cable cleaning device includes at least two scrapers 20. One end of each scraper 20 is connected to the inner wall of the protective tube 4, and the other end extends horizontally and abuts against the surface of the cable tape 5. This causes the scraper 20 to generate a scraping force on the surface of the cable tape 5, so that after the cable tape 5 passes through each scraper 20, the oil adhering to its surface slides down by gravity, thereby completing the purpose of removing the oil from the cable tape 5. Since there is a gap between the outer peripheral wall of the measuring rod 3 and the inner peripheral wall of the protective tube 4, after the oil is removed from the cable tape 5, it is recovered into the oil storage tank along the gap between the measuring rod 3 and the protective tube 4. Preferably, in order to improve the cleaning effect on the cable tape 5, the scrapers 20 are staggered in the vertical direction. For example, when two scrapers 20 are provided, the ends of the two scrapers 20 that are not connected to the inner wall of the protective tube 4 abut against the two side surfaces of the cable tape 5, and are spaced apart in the vertical direction.

[0040] Furthermore, the process of this utility model for detecting the liquid level, oil-water interface, and bottom platform position in an oil storage tank is as follows:

[0041] A typical complete testing process starts from the top of the tank and proceeds downwards, first measuring the liquid level, then the oil-water interface, and finally the tank bottom platform. The media detection sensor measures different media and sends signals at five points via a cable ruler to each connected circuit. Each connected circuit then controls the buzzer 14 to sound at different frequencies, the LED 15 to flash at different frequencies, and the display screen 19 to show the current media name.

[0042] In field application, the device is carried to the tank and placed at the oil gauging port on the top of the tank. The power switch is turned on to start the measurement. Initially, the medium detection sensor is in the air, and the audible and visual alarm frequency is a slow 0.5Hz. The display screen 19 shows that the current state is air. As the hand crank is turned to lower the medium detection sensor, when the medium detection sensor enters the liquid surface, the audible and visual alarm frequency becomes a faster 1Hz. At this time, the up and down position of the medium detection sensor is finely adjusted by turning the hand crank in both directions, so that the medium detection sensor is at the critical position of the gas-liquid interface. At this time, the scale line on the cable tape 5 pointed to by the pointer 16 is the current liquid level position, i.e., the empty liquid level. Continue cranking the handwheel to lower the medium detection sensor. When probe 7 of the medium detection sensor enters the liquid, the audible and visual alarm frequency becomes more rapid at 2Hz. At this time, finely adjust the position of the medium detection sensor up and down using the handwheel to bring it to the preset conductivity threshold value. The value indicated on the cable tape 5 by the pointer 16 at this point is the oil-water interface position. Continue lowering the medium detection sensor. When the medium detection sensor touches the bottom platform of the tank, it will change from a vertical to an inclined state. The medium detection sensor detects this inclination, and the audible and visual alarm becomes a continuous sound. The display screen 19 shows the bottom of the tank. The operator manually pulls the cable tape 5 to bring the tilt angle of the medium detection sensor to a preset fixed angle value. The display screen 19 shows the bottom of the tank, and the audible and visual alarm frequency becomes 3Hz. The scale indicated on the cable tape 5 by the pointer 16 at this point is the bottom height of the tank. Throughout the measurement process, the display screen 19 will display the medium temperature in real time.

[0043] Any adaptive changes made according to actual needs are within the protection scope of this utility model.

[0044] It should be noted that, for those skilled in the art, it is obvious that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this utility model is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0045] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A measuring device for an oil storage tank, characterized in that, The device includes a main support frame, a wheel rotatably mounted on the main support frame, and guide components spaced apart on one side of the wheel. A flexible cable tape is wound onto the wheel. The cable tape has graduations to identify its unwinding length. One end of the cable tape is fixed to the wheel, and the other end passes around the guide components and is connected to a medium detection sensor. The medium detection sensor is lowered into the oil storage tank along with the cable tape and is used to sense the liquid level, oil-water interface, and bottom platform position in the oil storage tank. The cable tape contains a cable electrically connected to the medium detection sensor. The end of the cable not connected to the medium detection sensor passes through the wheel and is electrically connected to an alarm. The alarm emits a corresponding alarm signal based on the current medium detected by the medium detection sensor.

2. The oil storage tank measuring device according to claim 1, characterized in that, The main support is movably equipped with a scale pointer, which is close to the cable ruler located at the top of the guide assembly.

3. The oil storage tank measuring device according to claim 1 or 2, characterized in that, The medium detection sensing device includes a gas-liquid interface detection mechanism, which includes a mechanical wave transmitter and a mechanical wave receiver, both electrically connected to the cable. The mechanical wave transmitter and the mechanical wave receiver are arranged opposite each other, and there is an air gap between them. The mechanical wave receiver is electrically connected to a first connection circuit for collecting changes in the amplitude of the mechanical wave. The first connection circuit is electrically connected to the alarm through the cable.

4. The oil storage tank measuring device according to claim 3, characterized in that, The medium detection sensing device includes an oil-water interface position detection mechanism, which includes two mutually insulated probes with a gap between them to accommodate the liquid to be tested. The probes are electrically connected to a second connection circuit for collecting the conductivity of the liquid to be tested between the two probes. The second connection circuit is electrically connected to the alarm via the cable.

5. The oil storage tank measuring device according to claim 4, characterized in that, Any of the probes has a built-in temperature sensor for detecting the liquid to be tested.

6. The oil storage tank measuring device according to claim 4, characterized in that, The medium detection sensing device includes a tank bottom platform position detection mechanism, which includes a tilt sensor. The tilt sensor is electrically connected to a third connection circuit for collecting its emitted signal. The third connection circuit is electrically connected to the alarm via the cable.

7. The oil storage tank measuring device according to claim 6, characterized in that, The alarm includes a buzzer, LED lights, and a display screen. The buzzer emits a buzzer at a corresponding frequency to the liquid level, the oil-water interface, and the tank bottom platform. The LED lights flash at a corresponding frequency to the liquid level, the oil-water interface, and the tank bottom platform. The display screen displays the corresponding medium information to the liquid level, the oil-water interface, and the tank bottom platform. Furthermore, the buzzer, the LED light, and the display screen are all electrically connected to the first connection circuit, the second connection circuit, and the third connection circuit.

8. The oil storage tank measuring device according to claim 7, characterized in that, The roulette wheel is equipped with an anti-disengagement self-locking mechanism, which includes a self-resetting locking pin and multiple locking holes. The locking holes are opened on the main support and are evenly spaced around the outer periphery of the rotation center of the roulette wheel. The locking pin is installed on the roulette wheel and is inserted into the corresponding locking hole when the roulette wheel is released from the hand.

9. The oil storage tank measuring device according to claim 8, characterized in that, The medium detection sensing device includes a measuring rod, the top end of which is connected to the cable tape, and the bottom end of which is used to install the gas-liquid interface detection mechanism, the oil-water interface position detection mechanism, and the tank bottom platform position detection mechanism. The main support is provided with a vertically extending protective tube with open ends. The protective tube has a limit hole and at least two locking holes at the same height position. Each locking hole is equally spaced along the circumference of the protective tube. The limit hole is located between two locking holes. A locking ring is coaxially rotatably sleeved on the outer peripheral wall of the protective tube. The locking ring is provided with a plurality of spring beads that correspond one-to-one with the limiting hole and each of the locking holes. Each spring bead rotates synchronously with the locking ring. After the spring bead corresponding to the locking hole rotates into position, it passes through the locking hole and abuts against the outer peripheral wall of the measuring rod. After the spring bead corresponding to the limiting hole rotates into position, it is fitted into the limiting hole and is spaced apart from the measuring rod.

10. The oil storage tank measuring device according to claim 9, characterized in that, The protective tube contains a cable cleaning device located above the measuring rod. The cable cleaning device includes at least two scrapers, one end of which is connected to the inner wall of the protective tube, and the other end extends horizontally and abuts against the two sides of the cable tape.

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