Automatic measuring device and method for volume verification of atmospheric pressure tank trucks

Abstract

The present invention relates to the field of volume calibration technology, and discloses an automatic measuring device and a measuring method for the volume calibration of a normal pressure tank truck. The device includes a water supply system, a calibration platform, and a reference tank. A first charging pipe and a second charging pipe are installed on the calibration platform. A first flow meter is installed in the first charging pipe, and a second flow meter is installed in the second charging pipe. The water supply system transports a calibration medium to the reference tank and the inspected tank through the first charging pipe and the second charging pipe, respectively. Both the reference tank and the inspected tank are provided with a liquid level gauge. The present invention sets a reference tank with known parameter data and performs volume calibration together with the inspected tank. It can not only measure the measured volume data of the reference tank and the inspected tank by directly injecting water, but also deduce the actual volume data of the inspected tank by comparison, thereby reducing the influence of different ambient temperatures on the measurement results and improving the accuracy and reliability of the test results.

Description

Technical Field

[0001] The present invention relates to the technical field of volume verification, and in particular to an automatic measuring device and a measuring method for volume verification of a normal pressure storage tank truck. Background Art

[0002] Measuring the capacity of tank trucks is of great significance for ensuring transportation safety, improving efficiency, reducing costs, and complying with regulations. Currently, the capacity comparison method is a common method for calibrating the capacity of automobile tank trucks in my country. For example, in the prior art, patent document No. CN117451144A discloses a 5G-based automatic calibration device and method for tank truck capacity, which includes a set of on-site standard tanks, a controller, a mobile terminal, a cloud service platform, etc. The on-site standard tank includes a magnetostrictive liquid level gauge, an electric water outlet ball valve, a temperature transmitter, etc. This invention realizes the automatic reading and data processing of the liquid volume value, temperature, liquid level and other signals of the standard metal measuring instrument, as well as the automatic control and timing of the electric ball valve. The calibration results can be sent to the cloud service platform or read through the electronic tag of the instrument. The entire calibration process is fully automated, greatly reducing the error of manual calibration and improving the calibration efficiency and accuracy.

[0003] In order to meet the requirements of the JJG133-2005 "Automobile Tank Truck Capacity" verification regulations and actual work needs, and to meet the verification of commonly used atmospheric pressure tank trucks, the water temperature change during a measurement process generally does not exceed 2°C. Because temperature has a great influence on the verification result of volume, in actual use, affected by different seasons and different ambient temperatures, the measured volume is different. It is necessary to set up a reference tank and perform volume verification together with the inspected tank to ensure the accuracy and reliability of the traceability of the measurement value. However, the existing tank truck volume verification device lacks volume verification of the reference tank, resulting in poor accuracy and reliability of the test results, which brings many inconveniences to the measurement work. Summary of the Invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art, which are poor accuracy and reliability of detection results due to the lack of volume verification of reference tanks, and to propose an automatic measuring device and measurement method for volume verification of atmospheric pressure storage tank trucks.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an automatic measuring device for volume calibration of atmospheric pressure storage tank trucks, comprising a water supply system, a calibration platform, and a reference tank; a first charging pipe and a second charging pipe are mounted on the calibration platform; a first flow meter is mounted in the first charging pipe, and a second flow meter is mounted in the second charging pipe; the water supply system delivers a calibration medium to the reference tank through the first charging pipe, and the water supply system delivers a calibration medium to the inspected storage tank through the second charging pipe;

[0006] A first liquid level gauge is installed at the bottom of the reference tank, and a second liquid level gauge is installed at the bottom of the inspected tank. Both the first liquid level gauge and the second liquid level gauge are non-contact liquid level gauges. When the reference tank and the inspected tank are filled with the same liquid level depth of the calibration medium, the storage volume in the reference tank and the inspected tank can be recorded from the first flow meter and the second flow meter respectively. After the tank is full, the difference between the values of the first flow meter and the second flow meter is small, and the volume of the inspected tank can be measured by reading the value of the second flow meter.

[0007] Preferably, the water supply system includes a water tank, a charging pump, a one-way valve and a filter. The inlet ends of the first charging pipe and the second charging pipe are both connected to the water tank. The first charging pipe and the second charging pipe are both installed with a charging pump, a one-way valve and a filter. A one-way valve and a third flow meter are installed on the output main pipe of the water tank. The first charging pipe and the second charging pipe are both connected to the output main pipe of the water tank. The charging pump can simultaneously fill water into the reference tank and the inspected storage tank at the same flow rate.

[0008] Preferably, the interiors of the reference tank and the inspected tank are both provided with a number of partitions, and a reserve adjusting assembly is installed at the bottom of the reference tank, the reserve adjusting assembly includes a mounting cylinder fixedly mounted on the reference tank, an adjusting column linearly slidingly mounted in the mounting cylinder, a servo motor is fixedly mounted on the bottom of the mounting cylinder, a transmission screw is fixedly mounted on the rotating end of the servo motor, and the transmission screw is threadedly connected to the adjusting column. When the adjusting column moves up and down in the mounting cylinder, the end of the adjusting column can extend into the reference tank. A displacement sensor for detecting the adjusting column is provided in the mounting cylinder. When the adjusting column telescopes, the volume in the reference tank is changed, which can also be used to adjust the liquid level in the tank.

[0009] Preferably, the bottom of the reference tank and the inspected storage tank are both installed with a discharge pipe, and both discharge pipes are provided with a shut-off valve, a one-way valve, a discharge pump, a filter and a fourth flow meter. The reference tank and the inspected storage tank are respectively connected to the water tank through the discharge pipe. After the inspection is completed, the calibration medium can be pumped into the water tank through the discharge pump.

[0010] The present invention also proposes an automatic measurement method for volume verification of a normal pressure tank truck, comprising the following steps:

[0011] S1. Start the loading pumps on the first loading pipe and the second loading pipe, and inject the test medium into the reference tank and the inspected tank at the same flow rate until the liquid level in the reference tank and the inspected tank reaches H0, then stop loading;

[0012] S2. Record the reserve parameter Vt1 and liquid level parameter Ht1 of the reference tank at the same time interval t1, where the reserve parameter Vt1 refers to the real-time value of the first flow meter, and the liquid level parameter Ht1 refers to the real-time value of the first liquid level meter, and draw a Vt1-Ht1 curve graph;

[0013] S3. At the same time interval t2, with t1=t2, record the storage parameter Vt2 and liquid level parameter Ht2 of the inspected storage tank, where the storage parameter Vt2 refers to the real-time value of the second flow meter, and the liquid level parameter Ht2 refers to the real-time value of the second liquid level meter, and draw a Vt2-Ht2 curve;

[0014] S4. Empty the calibration medium in the reference tank and the inspected storage tank through the discharge pipe, and record the values of the fourth flowmeter on the two discharge pipes respectively.

[0015] Preferably, S1, S2, and S3 are performed simultaneously to measure the water temperature in the reference tank and the inspected tank respectively. When the temperature difference between the water temperature in the reference tank and the inspected tank is less than 2°C, the loading pump is stopped. If Ht1 is not equal to Ht2 at this time, a marking line is marked on the surface of the inspected tank. The height of the marking line is the same as Ht2. In actual use, the position marked by the marking line is convenient for later focused inspection of the position, analysis of the causes of the difference, timely discovery of safety hazards, or narrowing of the maintenance scope to facilitate maintenance.

[0016] Preferably, when Ht1 is not equal to Ht2, the servo motor is started to drive the adjustment column to move up and down so that Ht1 is equal to Ht2, and the upward or downward movement distance L1 of the adjustment column is recorded by the displacement sensor;

[0017] Start the loading pumps on the first loading pipe and the second loading pipe, and inject the same amount of calibration medium into the reference tank and the inspected tank at the same flow rate. Start the servo motor to drive the adjustment column up and down to make Ht1 equal to Ht2 again. The upward or downward movement distance L2 of the adjustment column is recorded by the displacement sensor. The local volume difference between the reference tank and the inspected tank = |L1-L2|×the cross-sectional area of the adjustment column. This local volume difference can intuitively reflect the volume difference of the internal structure of the reference tank and the inspected tank, so that the device can promptly detect whether there are quality problems in hidden places in the tank while calibrating the volume.

[0018] Preferably, when the liquid level heights in the reference tank and the inspected tank are both H0, the storage volumes of the reference tank and the inspected tank are Vc1 and Vc2 respectively. When the calibration medium is 20°C and the liquid level height is H0, the storage volume of the reference tank is a known value Vb, then, if Vb>Vc1, it can be calculated that when the calibration medium is 20°C, the storage volume of the inspected tank is Vc2+(Vb-Vc1); if Vb<Vmeasure1, it can be calculated that when the calibration medium is 20°C, the storage volume of the inspected tank is Vc2-(Vc1-Vb). This measurement method reduces the impact of different ambient temperatures on the calibration results, making the volume calibration of the inspected tank more accurate and quick.

[0019] The present invention has the following beneficial effects:

[0020] 1. The automatic measuring device for volume verification of atmospheric pressure tank trucks proposed in the present invention performs volume verification together with the inspected tank by setting up a reference tank with known parameter data. It can not only measure the measured volume data of the reference tank and the inspected tank by directly injecting water, but also deduce the actual volume data of the inspected tank by comparison, thereby reducing the impact of different ambient temperatures on the measurement results and improving the accuracy and reliability of the test results.

[0021] 2. The automatic measuring device for volume verification of atmospheric pressure storage tank trucks proposed in the present invention sets an adjustment column with known parameter data in the reference tank. When performing volume verification on the reference tank and the inspected tank, the liquid level in the reference tank can be regulated by changing the telescopic length of the adjustment column and made the same as the liquid level in the inspected tank. The automatic measuring method for volume verification of atmospheric pressure storage tank trucks proposed in the present invention can be used to calculate the local volume difference between the reference tank and the inspected tank by adjusting the displacement distance of the adjustment column. The local volume difference can intuitively reflect the volume difference of the internal structure of the reference tank and the inspected tank. The main reason for the volume difference is whether there is foreign matter in the inspected tank, or whether the number or thickness of the partitions in the inspected tank meets the requirements. Therefore, the device can promptly detect whether there are quality problems in hidden places in the tank while verifying the volume.

[0022] 3. The automatic measurement method for volume calibration of atmospheric pressure tank trucks proposed in the present invention injects calibration medium into the reference tank and the inspected tank at the same flow rate, and records the liquid level heights in the reference tank and the inspected tank in real time. When the liquid level heights in the reference tank and the inspected tank differ greatly, a marking line can be marked at the corresponding height on the surface of the inspected tank. According to the position marked by the marking line, it is convenient to focus on the position at a later time, analyze the cause of the difference, discover safety hazards in time, or narrow the scope of maintenance, provide convenience for maintenance, and provide reference data for analysis of the cause of volume deviation while calibrating the volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the three-dimensional structure of the device proposed by the present invention;

[0024] Figure 2 This is a schematic diagram of the cross-sectional structure of the reference tank proposed in the present invention;

[0025] Figure 3 for Figure 2 A schematic diagram of the structure enlargement at point A;

[0026] Figure 4 A schematic plan view of the device proposed in the present invention;

[0027] Figure 5 This is the Vt1-Ht1 curve diagram proposed by the present invention;

[0028] Figure 6 This is the Vt2-Ht2 curve diagram proposed by the present invention;

[0029] Figure 7 Schematic diagram of Vt1-Ht1 curve and Vt2-Ht2 curve Figure 1 ;

[0030] Figure 8 Schematic diagram of Vt1-Ht1 curve and Vt2-Ht2 curve Figure 2 ;

[0031] Figure 9 Schematic diagram of Vt1-Ht1 curve and Vt2-Ht2 curve Figure 3 .

[0032] In the figure: 1 calibration platform, 2 reference tank, 3 first charging pipe, 4 second charging pipe, 5 first flowmeter, 6 second flowmeter, 7 first liquid level gauge, 8 second liquid level gauge, 9 inspected storage tank, 10 water tank, 11 charging pump, 12 one-way valve, 13 filter, 14 partition, 15 mounting cylinder, 16 adjusting column, 17 servo motor, 18 transmission screw, 19 unloading pipe, 20 stop valve, 21 third flowmeter, 22 unloading pump, 23 fourth flowmeter. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0034] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0035] Reference Figure 1-Figure 4 An automatic measuring device for volume calibration of atmospheric pressure tank trucks includes a water supply system, a calibration platform 1 and a reference tank 2. A first charging pipe 3 and a second charging pipe 4 are installed on the calibration platform 1. A first flow meter 5 is installed in the first charging pipe 3, and a second flow meter 6 is installed in the second charging pipe 4. The water supply system transports the calibration medium to the reference tank 2 through the first charging pipe 3, and the water supply system transports the calibration medium to the inspected tank 9 through the second charging pipe 4.

[0036] Specifically, such as Figure 4As shown, the water supply system includes a water tank 10, a charging pump 11, a one-way valve 12 and a filter 13. The inlet ends of the first charging pipe 3 and the second charging pipe 4 are both connected to the water tank 10, and the first charging pipe 3 and the second charging pipe 4 are both installed with a charging pump 11, a one-way valve 12 and a filter 13.

[0037] A one-way valve 12 and a third flow meter 21 are installed on the output main pipe of the water tank 10 , and the first charging pipe 3 and the second charging pipe 4 are both connected to the output main pipe of the water tank 10 .

[0038] A first liquid level gauge 7 is installed at the bottom of the reference tank 2, and a second liquid level gauge 8 is installed at the bottom of the inspected storage tank 9. The first liquid level gauge 7 and the second liquid level gauge 8 are both non-contact liquid level gauges. The first liquid level gauge 7 and the second liquid level gauge 8 can respectively measure the liquid level heights in the reference tank 2 and the inspected storage tank 9. Among them, a number of partitions 14 are provided inside the reference tank 2 and the inspected storage tank 9. The partitions 14 inside the tank have a wave-breaking effect to reduce the impact of the liquid in the tank body when the car is driving. The partitions 14 belong to the conventional settings of the prior art and will not be elaborated here.

[0039] When the reference tank 2 and the inspected storage tank 9 are filled with the calibration medium with the same liquid level depth, the storage capacity in the reference tank 2 and the inspected storage tank 9 can be recorded by the first flow meter 5 and the second flow meter 6 respectively. It should be noted that according to the requirements of the calibration regulations JJG133-2005 "Capacity of Automobile Tank Trucks", the calibration medium uses circulating water, and it is necessary to ensure that the water temperature does not change by more than 2°C during a measurement process.

[0040] like Figure 2 、 Figure 3 As shown, a reserve adjustment component is installed at the bottom of the reference tank 2, and the reserve adjustment component includes a mounting cylinder 15 fixedly mounted on the reference tank 2, an adjustment column 16 linearly slidingly mounted in the mounting cylinder 15, a servo motor 17 is fixedly mounted on the bottom of the mounting cylinder 15, a transmission screw 18 is fixedly mounted on the rotating end of the servo motor 17, and the transmission screw 18 is threadedly connected to the adjustment column 16. When the adjustment column 16 moves up and down in the mounting cylinder 15, the end of the adjustment column 16 can extend into the reference tank 2, and a displacement sensor for detecting the adjustment column 16 is provided in the mounting cylinder 15.

[0041] It should be noted that the various parameters of the reference tank 2 are known information, such as the volume, empty height, number and thickness of the partitions 14 in the reference tank 2, and the various parameters of the adjusting column 16 are known information, such as the diameter, length, cross-sectional area, etc. of the adjusting column 16. When the upper end face of the adjusting column 16 is flush with the inner bottom wall of the reference tank 2, the volume in the reference tank 2 is a known nominal volume, recorded as V. When the adjusting column 16 is extended into the reference tank 2, the volume in the reference tank 2 at this time decreases, and the liquid level inside it will rise. When the adjusting column 16 is retracted into the mounting tube 15, the volume in the reference tank 2 at this time increases, and the liquid level inside it will drop.

[0042] A discharge pipe 19 is installed at the bottom of the reference tank 2 and the inspected storage tank 9. Both discharge pipes 19 are provided with a stop valve 20, a one-way valve 12, a discharge pump 22, a filter 13 and a fourth flow meter 23. The reference tank 2 and the inspected storage tank 9 are connected to the water tank 10 through the discharge pipe 19 respectively. After the inspection is completed, the calibration medium can be pumped into the water tank 10 through the discharge pump 22.

[0043] In the process of calibrating the volume of the inspected storage tank 9, after the tank is full, the difference between the values of the first flow meter 5 and the second flow meter 6 is small, and the volume of the inspected storage tank 9 can be measured by reading the value of the second flow meter 6. Ideally, the value of the third flow meter 21 is equal to the sum of the values of the first flow meter 5 and the second flow meter 6, and is also equal to the sum of the values of the two fourth flow meters 23. Since the volume in the reference tank 2 is known, when the value of the first flow meter 5 is significantly different from the volume value in the reference tank 2 when the tank is full, it can be inferred that there is an abnormality in the first flow meter 5, which can prevent errors in the calibration results caused by flow meter failure, so that they can be discovered and corrected in time.

[0044] The present invention also proposes an automatic measurement method for the volume verification of an atmospheric pressure storage tank truck. The automatic measurement device for the volume verification of an atmospheric pressure storage tank truck proposed in the present invention is used to verify the volume of the inspected storage tank 9, comprising the following steps:

[0045] S1. Start the charging pumps 11 on the first charging pipe 3 and the second charging pipe 4, and inject the test medium into the reference tank 2 and the test tank 9 at the same flow rate until the liquid level in the reference tank 2 and the test tank 9 reaches H0, then stop charging;

[0046] S2. At the same time interval t1, record the reserve parameter Vt1 and liquid level parameter Ht1 of the reference tank 2. The reserve parameter Vt1 refers to the real-time value of the first flow meter 5, and the liquid level parameter Ht1 refers to the real-time value of the first liquid level meter 7. Draw a Vt1-Ht1 curve, as shown in Figure 5 As shown;

[0047] S3. At the same time interval t2, with t1=t2, record the storage parameter Vt2 and liquid level parameter Ht2 of the inspected storage tank 9. The storage parameter Vt2 refers to the real-time value of the second flow meter 6, and the liquid level parameter Ht2 refers to the real-time value of the second liquid level meter 8. Draw a Vt2-Ht2 curve, as shown in Figure 6 As shown;

[0048] S4. Empty the calibration medium in the reference tank 2 and the inspected storage tank 9 through the discharge pipe 19, and record the values of the fourth flowmeter 23 on the two discharge pipes 19 respectively.

[0049] Among them, S1, S2, and S3 are carried out simultaneously, and the water temperature in the reference tank 2 and the inspected storage tank 9 is measured respectively. When the temperature difference between the water temperature in the reference tank 2 and the inspected storage tank 9 is less than 2°C, the charging pump 11 is stopped. If Ht1 is not equal to Ht2 at this time, a mark line is marked on the surface of the inspected storage tank 9, and the height of the mark line is the same as Ht2. Figure 7 shown.

[0050] During actual use, according to the position of the marker line, it is convenient to focus on the inspection of that position later, analyze the cause of the difference, discover safety hazards in time, or narrow the scope of maintenance to facilitate maintenance. For example, an X-ray detector is used to detect the position marked with a marker line on the inspected storage tank 9. While verifying the volume, the Vt1-Ht1 curve and the Vt2-Ht2 curve are compared to provide reference data for the analysis of the volume deviation. Under normal circumstances, the temperature difference of the water introduced into the reference tank 2 and the inspected storage tank 9 by a water tank 10 at the same time is less than 2°C. If it is greater than 2°C, manual intervention is required; if Ht1 is equal to Ht2, it indicates that the reference tank 2 and the inspected storage tank 9 have the same water storage capacity and the same liquid level. The theoretical value here is a theoretical value. There is a certain deviation in reality. As long as it is within the allowable tolerance range, it will not be elaborated here.

[0051] In addition, when S1, S2, and S3 are performed simultaneously and equal amounts of test medium are injected into the reference tank 2 and the test tank 9, when Ht1 is not equal to Ht2, the servo motor 17 is started to drive the adjustment column 16 to move up and down to make Ht1 equal to Ht2. Figure 8 As shown, at this time, Ht1=Ht2=h1, and the upward or downward movement distance L1 of the adjustment column 16 is recorded by the displacement sensor;

[0052] Start the charging pumps 11 on the first charging pipe 3 and the second charging pipe 4, and inject the same amount of calibration medium into the reference tank 2 and the test tank 9 at the same flow rate. Start the servo motor 17 to drive the adjustment column 16 up and down to make Ht1 equal to Ht2 again. The displacement sensor records the upward or downward movement distance L2 of the adjustment column 16, as shown in the figure. Figure 9 As shown, at this time, Ht1=Ht2=h2, the local volume difference between the reference tank 2 and the inspected storage tank 9 = |L1-L2|×the cross-sectional area of the adjusting column 16, and the local volume difference here refers to the volume difference between the reference tank 2 and the inspected storage tank 9 within the height range of h2-h1.

[0053] An adjusting column 16 with known parameter data is set in the reference tank 2. When the reference tank 2 and the inspected tank 9 are subjected to volume calibration, the liquid level in the reference tank 2 can be regulated and controlled by changing the telescopic length of the adjusting column 16, and made the same as the liquid level in the inspected tank 9. The automatic measurement method for volume calibration of atmospheric pressure tank trucks proposed in the present invention can be used to calculate the local volume difference between the reference tank 2 and the inspected tank 9 by adjusting the displacement distance of the adjusting column 16. The local volume difference can intuitively reflect the volume difference of the internal structure of the reference tank 2 and the inspected tank 9. Under the premise that the parameter data of the reference tank 2 meet the product quality requirements, the main reason for the volume difference is whether there are foreign objects in the inspected tank 9, or whether the number or thickness of the partitions 14 in the inspected tank 9 meets the requirements, so that the device can timely discover whether there are quality problems in the hidden parts of the tank while calibrating the volume.

[0054] Start the servo motor 17 to drive the adjusting column 16 to move up and down. When the upper end surface of the adjusting column 16 is flush with the inner bottom wall of the reference tank 2, continue the operations of S1, S2, and S3 to measure the full tank volume of the reference tank 2 and the inspected storage tank 9.

[0055] In this embodiment, reference Figure 5 、 Figure 6 When the upper end surface of the regulating column 16 is flush with the inner bottom wall of the reference tank 2, the volumes of the reference tank 2 and the inspected tank 9 are calibrated. After the reference tank 2 and the inspected tank 9 are filled with water, when the liquid levels in the reference tank 2 and the inspected tank 9 are both H0, the storage volumes of the reference tank 2 and the inspected tank 9 are Vc1 and Vc2, respectively, where Vc1 and Vc2 are the values actually measured by the first flowmeter 5 and the second flowmeter 6;

[0056] For example, the known information of reference tank 2 is that when the test medium is at 20°C, the liquid level is H0, and the upper end surface of the adjustment column 16 is flush with the inner bottom wall of reference tank 2, the storage volume of reference tank 2 is a known value Vmark. Vmark represents the nominal volume of reference tank 2. Due to the influence of ambient temperature, Vc1, Vc2 and Vmark are not equal.

[0057] Then, if Vb>Vc1, it can be calculated that when the calibration medium is 20°C, the storage volume of the inspected storage tank 9 is Vc2+(Vb-Vc1); if Vb<Vc1, it can be calculated that when the calibration medium is 20°C, the storage volume of the inspected storage tank 9 is Vc2-(Vc1-Vb). In summary, when the ambient temperature and the calibration medium temperature are not equal to 20°C, the volume of the inspected storage tank 9 can be calibrated. This measurement method reduces the impact of different ambient temperatures on the calibration results, making the volume calibration of the inspected storage tank 9 more accurate and quick.

[0058] If Vc1=Vc2, the storage volume of the inspected storage tank 9 is equal to Vmark.

[0059] It should be noted that according to the requirements of the JJG133-2005 "Capacity of Automobile Tank Trucks" verification regulations, the volume calculation must be performed at 20°C. The above method only uses the example of calculating the storage volume of the inspected tank 9 when the verification medium is 20°C.

[0060] The automatic measuring device for volume calibration of atmospheric pressure tank trucks proposed in the present invention performs volume calibration together with the inspected tank 9 by setting a reference tank 2 with known parameter data. It can not only measure the measured volume data of the reference tank 2 and the inspected tank 9 by directly injecting water, but also deduce the actual volume data of the inspected tank 9 by comparison, thereby reducing the influence of different ambient temperatures on the measurement results and improving the accuracy and reliability of the detection results.

[0061] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. An automatic measuring device for volume calibration of a normal pressure tank truck, comprising a water supply system, a calibration platform (1) and a reference tank (2), characterized in that: The calibration platform (1) is provided with a first charging pipe (3) and a second charging pipe (4), a first flow meter (5) is provided in the first charging pipe (3), and a second flow meter (6) is provided in the second charging pipe (4), a water supply system transports the calibration medium to the reference tank (2) through the first charging pipe (3), and a water supply system transports the calibration medium to the inspected storage tank (9) through the second charging pipe (4); A first liquid level gauge (7) is installed at the bottom of the reference tank (2), and a second liquid level gauge (8) is installed at the bottom of the inspected storage tank (9). Both the first liquid level gauge (7) and the second liquid level gauge (8) are non-contact liquid level gauges. When the reference tank (2) and the inspected storage tank (9) are filled with the same liquid level depth of the calibration medium, the storage volume in the reference tank (2) and the inspected storage tank (9) can be recorded from the first flow meter (5) and the second flow meter (6) respectively. The reference tank (2) and the inspected storage tank (9) are both provided with a plurality of partitions (14). A storage regulating assembly is installed at the bottom of the reference tank (2). The storage regulating assembly includes a mounting cylinder (15) fixedly mounted on the reference tank (2), an adjusting column (16) linearly slidingly mounted in the mounting cylinder (15), a servo motor (17) fixedly mounted on the bottom of the mounting cylinder (15), a transmission screw (18) fixedly mounted on the rotating end of the servo motor (17), and the transmission screw (18) is threadedly connected to the adjusting column (16). When the adjusting column (16) moves up and down in the mounting cylinder (15), the end of the adjusting column (16) can extend into the reference tank (2). A displacement sensor for detecting the adjusting column (16) is provided in the mounting cylinder (15).

2. The automatic measuring device for volume verification of a normal pressure tank truck according to claim 1, characterized in that: The water supply system comprises a water tank (10), a charging pump (11), a one-way valve (12) and a filter (13); the inlet ends of the first charging pipe (3) and the second charging pipe (4) are both connected to the water tank (10); and the first charging pipe (3) and the second charging pipe (4) are both equipped with a charging pump (11), a one-way valve (12) and a filter (13).

3. The automatic measuring device for volume verification of a normal pressure tank truck according to claim 2, characterized in that: A one-way valve (12) and a third flow meter (21) are installed on the output main pipe of the water tank (10), and the first charging pipe (3) and the second charging pipe (4) are both connected to the output main pipe of the water tank (10).

4. The automatic measuring device for volume verification of a normal pressure tank truck according to claim 3, characterized in that: The reference tank (2) and the inspected storage tank (9) are both provided with a discharge pipe (19) at the bottom. Both discharge pipes (19) are provided with a stop valve (20), a one-way valve (12), a discharge pump (22), a filter (13) and a fourth flow meter (23). The reference tank (2) and the inspected storage tank (9) are respectively connected to the water tank (10) through the discharge pipe (19).

5. An automatic measurement method for the volume verification of an atmospheric pressure storage tank truck, using the automatic measurement device for the volume verification of an atmospheric pressure storage tank truck according to claim 4 to verify the volume of the inspected storage tank (9), characterized in that: The following steps are involved: S1. Start the charging pumps (11) on the first charging pipe (3) and the second charging pipe (4), and inject the test medium into the reference tank (2) and the test tank (9) at the same flow rate until the liquid level in the reference tank (2) and the test tank (9) reaches H0, and then stop charging; S2. Record the storage parameter Vt1 and liquid level parameter Ht1 of the reference tank (2) at the same time interval t1. The storage parameter Vt1 refers to the real-time value of the first flow meter (5), and the liquid level parameter Ht1 refers to the real-time value of the first liquid level meter (7). Draw a Vt1-Ht1 curve graph. S3, at the same time interval t2, with t1=t2, record the storage parameter Vt2 and the liquid level parameter Ht2 of the inspected storage tank (9), where the storage parameter Vt2 refers to the real-time value of the second flow meter (6), and the liquid level parameter Ht2 refers to the real-time value of the second liquid level meter (8), and draw a Vt2-Ht2 curve; S4, emptying the calibration medium in the reference tank (2) and the inspected storage tank (9) through the discharge pipe (19), and recording the values of the fourth flowmeter (23) on the two discharge pipes (19); Among them, S1, S2, and S3 are carried out simultaneously, and the water temperature in the reference tank (2) and the inspected storage tank (9) is measured respectively. When the temperature difference between the water temperature in the reference tank (2) and the inspected storage tank (9) is less than 2°C, the charging pump (11) is stopped. If Ht1 is not equal to Ht2 at this time, a mark line is marked on the surface of the inspected storage tank (9), and the height of the mark line is the same as Ht2; When Ht1 is not equal to Ht2, the servo motor (17) is started to drive the adjustment column (16) to move up and down so that Ht1 is equal to Ht2, and the upward or downward movement distance L1 of the adjustment column (16) is recorded by the displacement sensor; Start the charging pumps (11) on the first charging pipe (3) and the second charging pipe (4), and inject the same amount of calibration medium into the reference tank (2) and the inspected storage tank (9) at the same flow rate. Start the servo motor (17) to drive the adjustment column (16) up and down so that Ht1 is equal to Ht2 again. The upward or downward movement distance L2 of the adjustment column (16) is recorded by the displacement sensor. The local volume difference between the reference tank (2) and the inspected storage tank (9) = |L1-L2|× the cross-sectional area of the adjustment column (16); When the liquid level heights in the reference tank (2) and the inspected storage tank (9) are both H0, the storage volumes of the reference tank (2) and the inspected storage tank (9) are Vc1 and Vc2 respectively. When the calibration medium is 20°C and the liquid level height is H0, the storage volume of the reference tank (2) is a known value Vb, then, if Vb>Vc1, it can be inferred that when the calibration medium is 20°C, the storage volume of the inspected storage tank (9) is Vc2+(Vb-Vc1); if Vb<Vc1, it can be inferred that when the calibration medium is 20°C, the storage volume of the inspected storage tank (9) is Vc2-(Vc1-Vb).

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