A method of calibrating a liquid-filled tank

Abstract

The present application relates to the field of metrological calibration, and discloses a kind of liquid-filled tank calibration method, including installing force connection structure on liquid-filled tank;Fixedly connect force calibration mechanism on the ground outside liquid-filled tank, connect the top of force calibration mechanism with force connection mechanism;Zero processing is carried out to force calibration mechanism and the weighing sensor at the tank foot of liquid-filled tank;Pulling force is applied between liquid-filled tank and ground by force calibration mechanism, force calibration mechanism measures the pulling force, and the weighing sensor at the tank foot of liquid-filled tank detects the liquid-filled tank subjected to pulling force;The pulling force measured by force calibration mechanism is compared with the data measured by weighing sensor, and the weighing calibration of liquid-filled tank is completed.The present application can solve the problem that the existing technology through hydraulic is only applicable to medium and large liquid-filled tank, and cannot carry out weighing calibration to small liquid-filled tank.

Description

Technical Field

[0001] This invention relates to the field of metrology and calibration, and specifically to a calibration method for a liquid container. Background Technology

[0002] In the biopharmaceutical field, various types and sizes of containers are commonly used to store various drugs, reagents, and liquids; these are simply called liquid tanks. Liquid tanks require weighing during use, typically achieved by connecting a load cell to the bottom of the tank. To ensure accurate and reliable weighing, the weighing system needs to be calibrated. While weight calibration is widely recognized as the most metrologically accepted calibration method, it is difficult to apply to liquid tank calibration. This is because commonly used liquid tanks range in size from hundreds or thousands of kilograms to several tons or even hundreds of tons, and there is no designated place to hang weights on them. Weights must be manually moved inside the tank, requiring significant manpower. Methods such as material substitution followed by transfer weighing are also used, but these are time-consuming, labor-intensive, costly, and lack precision. The existing technology CN208672132U provides a technology that connects a force-applying structure between the tank foot and the ground, and performs weighing calibration by hydraulic force application in conjunction with a tension sensor. However, the hydraulic structure of this technology requires a large installation height space and is suitable for weighing calibration of medium and large material tanks. For small liquid tanks, it is difficult to perform weighing calibration due to insufficient height space at the tank foot. Summary of the Invention

[0003] The present invention aims to provide a method for calibrating liquid tanks, in order to solve the problems in the prior art where weighing calibration of liquid tanks using weights is time-consuming, laborious and difficult, and hydraulic calibration is only applicable to medium and large liquid tanks and cannot be used for weighing calibration of small liquid tanks.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a method for calibrating a liquid filling tank, comprising the following steps:

[0005] A. Install a force-applying connection structure on the liquid filling tank;

[0006] B. Fix the force calibration mechanism to the ground outside the liquid tank, and connect the top of the force calibration mechanism to the force connection mechanism;

[0007] C. Zero the load cells at the foot of the force calibration mechanism and the liquid tank;

[0008] D. A pulling force is applied between the liquid tank and the ground through a force calibration mechanism. The force calibration mechanism measures the applied pulling force, and the load cell at the foot of the liquid tank weighs the liquid tank subjected to the pulling force.

[0009] E. Compare and verify the tensile force measured by the force calibration mechanism with the data measured by the weighing sensor to complete the weighing calibration of the liquid tank.

[0010] Preferably, as an improvement, in step A, a mesh made of iron cables is covered over the liquid tank from top to bottom as a force-applying connection structure, and multiple pull rings are evenly distributed at the bottom of the mesh along the circumference of the liquid tank.

[0011] Preferably, as an improvement, in step A, multiple crossbeams are welded between the tank feet of the liquid container as a force-applying connection structure, and multiple evenly distributed pull rings are welded to the bottom of the multiple crossbeams.

[0012] Preferably, as an improvement, in step B, a force calibration mechanism is formed by connecting the U-shaped seat, force application component, U-shaped seat, tension sensor and H-shaped seat in sequence from top to bottom. A pull ring is pre-embedded in the ground outside the tank foot of the liquid tank. The U-shaped seat at the top is connected to the force application connection mechanism, and the H-shaped seat at the bottom is connected to the pull ring pre-embedded in the ground.

[0013] Preferably, as an improvement, a hydraulic cylinder is used as the force-applying component in step B, with the upper and lower ends of the hydraulic cylinder connected to a U-shaped seat respectively.

[0014] Preferably, as an improvement, the force-applying component in step B uses two pull plates, with multiple threaded rods passing between the two pull plates. Nuts are connected to the ends of the threaded rods located on the outer side of the pull plates. Pull rods are connected to the middle of both pull plates, with nuts connected to the ends of the pull rods located on the inner side of the pull plates. Each of the two pull rods is connected to a U-shaped seat.

[0015] Preferably, as an improvement, in step D, a tension sensor is used to measure the tension. The tension sensor is electrically connected to a display to show the tension value. The data measured by the weighing sensor is processed by a PLC and output as a weighing value in the same unit as the tension value output by the tension sensor.

[0016] Preferably, as an improvement, in step E, if the tensile force value and the weighing value are the same, the liquid tank is weighed accurately; if there is a difference between the tensile force value and the weighing value, the liquid tank is weighed incorrectly.

[0017] The principle and advantages of this solution are as follows: In practical applications, the load cell between the tank feet and the ground serves as the weighing system for the liquid tank itself. The load cell is electrically connected to a PLC to output weighing information. This invention connects a force-applying calibration mechanism and a force-applying connection structure to the liquid tank. Tension is applied through the force-applying connection structure, and a tension sensor monitors the tension. By comparing the monitored tension with the weighing information monitored by the load cell, the liquid tank can be calibrated. This invention allows for various designs for the force-applying connection structure of the liquid tank. For large and medium-sized liquid tanks, ear plates can be installed on the tank feet, or a force-applying frame can be installed between the tank feet. For small liquid tanks, a mesh covering the tank is used. By controlling the height of the bottom of the mesh covering the top of the tank, the required space height for the force-applying calibration mechanism can be met, thus enabling effective weighing calibration of small liquid tanks. The force application calibration mechanism employs a hydraulic cylinder, offering a high degree of automation and convenient, efficient force application. It also incorporates a pull plate, pull rod, and threaded rod, allowing for manual adjustment of the distance between two pull plates to apply force, ensuring stable and reliable operation. This invention enables the weighing calibration of liquid tanks of varying sizes. The calibration process is convenient and labor-saving, solving the problems of existing technologies where weighing calibration of liquid tanks using weights is time-consuming and laborious, and hydraulic methods are only suitable for medium to large-sized liquid tanks, unable to calibrate small liquid tanks. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention.

[0019] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of the present invention.

[0020] Figure 3 This is a schematic diagram of the structure of Embodiment 3 of the present invention. Detailed Implementation

[0021] The following detailed description illustrates the specific implementation method:

[0022] The reference numerals in the accompanying drawings of the instruction manual include: liquid tank 1, tank foot 2, weighing sensor 3, H-type seat 4, U-type seat 5, pull ring 6, hydraulic cylinder 7, tension sensor 8, pull net 9, crossbeam 10, pull plate 12, pull rod 13, and threaded rod 14.

[0023] Example 1: A method for calibrating a liquid container, comprising the following steps:

[0024] A. Install a force-applying connection structure on liquid tank 1, combined with... Figure 1 As shown, a net 9 made of iron cables is covered on the liquid tank 1 from top to bottom as a force-applying connection structure, and three pull rings 6 are evenly distributed around the bottom of the net 9 along the circumference of the liquid tank 1.

[0025] B. A force calibration mechanism is fixedly connected to the ground outside the liquid tank 1. The force calibration mechanism is composed of U-shaped seat 5, force application component, U-shaped seat 5, tension sensor 8 and H-shaped seat 4 connected from top to bottom. Hydraulic cylinder 7 is used as force application component. The upper and lower ends of hydraulic cylinder 7 are respectively connected to a U-shaped seat 5. Pull ring 6 is pre-embedded in the ground outside the tank foot 2 of liquid tank 1. The U-shaped seat 5 at the top of the force calibration mechanism is connected to the pull ring 6 at the bottom of the pull net 9 with a pin. The H-shaped seat 4 at the bottom is connected to the pull ring 6 pre-embedded in the ground with a pin.

[0026] C. Zero the load cells 3 at the foot 2 of the force calibration mechanism and the liquid tank 1;

[0027] D. A pulling force is applied between the liquid tank 1 and the ground through the force calibration mechanism. The force calibration mechanism uses a tension sensor 8 to measure the applied pulling force. The tension sensor 8 is electrically connected to a display to display the pulling force value. The weighing sensor 3 at the tank foot 2 of the liquid tank 1 weighs the liquid tank 1 under the pulling force. The data measured by the weighing sensor 3 is processed by the PLC and output as a weighing value in the same unit as the pulling force value output by the tension sensor 8.

[0028] E. Compare and verify the tensile force measured by the force calibration mechanism with the data measured by the weighing sensor 3. If the tensile force value is the same as the weighing value, the liquid tank 1 is weighed accurately. If there is a difference between the tensile force value and the weighing value, the liquid tank 1 is weighed in deviation. The weighing calibration of the liquid tank 1 is completed.

[0029] Example 2, the only difference between this example and Example 1 is that, in combination with... Figure 2 As shown, in step A, multiple crossbeams 10 are welded between the tank feet 2 of the liquid tank 1 as a force-applying connection structure, and three evenly distributed pull rings 6 are welded to the bottom of the multiple crossbeams 10. In step B, the U-shaped seat 5 at the top of the force-applying calibration mechanism is connected to the pull rings 6 at the bottom of the crossbeams with a pin.

[0030] Example 3, the only difference between this example and Example 1 is that, in combination Figure 3 As shown, in step B, the force-applying component uses two pull plates 12, with four threaded rods 14 passing between them. Nuts are connected to the outer ends of the threaded rods 14 on the pull plates 12. Pull rods 13 are connected to the middle of each pull plate 12, with nuts connected to the inner ends of the pull rods 13 on the pull plates 12. Each pull rod 13 is connected to a U-shaped seat 5. In this embodiment, in step D, adjusting the nuts on the threaded rods 14 reduces the distance between the two pull plates 12. The pulling force generated by the adjustment of the nuts on the threaded rods 14 is applied to the force sensor 8 and the pull net 9 through the pull rods 13.

[0031] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A method for calibrating a liquid-filled tank, characterized in that: Includes the following steps: A. Install a force-applying connection structure on the liquid filling tank; In step A, cover the liquid filling tank from top to bottom with a net made of iron cables as a force-applying connection structure, and distribute multiple pull rings evenly along the circumference of the liquid filling tank at the bottom of the net. B. Fix the force calibration mechanism to the ground outside the liquid tank, and connect the top of the force calibration mechanism to the force connection mechanism; In step B, the force calibration mechanism is composed of U-shaped seat, force assembly, U-shaped seat, tension sensor and H-shaped seat connected from top to bottom. A pull ring is pre-embedded in the ground outside the tank foot of the liquid tank. The U-shaped seat at the top is connected to the force connection mechanism, and the H-shaped seat at the bottom is connected to the pull ring pre-embedded in the ground; The force assembly uses two pull plates, and multiple threaded rods are passed between the two pull plates. Nuts are connected to the ends of the threaded rods on the outside of the pull plates. Pull rods are connected to the middle of the two pull plates. Nuts are connected to the ends of the pull rods on the inside of the pull plates. The two pull rods are connected to a U-shaped seat respectively; C. Zero the load cells at the foot of the force calibration mechanism and the liquid tank; D. A pulling force is applied between the liquid tank and the ground through a force calibration mechanism. The force calibration mechanism measures the applied pulling force, and the load cell at the foot of the liquid tank weighs the liquid tank subjected to the pulling force. E. Compare and verify the tensile force measured by the force calibration mechanism with the data measured by the weighing sensor to complete the weighing calibration of the liquid tank.

2. The liquid filling tank calibration method according to claim 1, characterized in that: In step A, multiple crossbeams are welded between the tank feet of the liquid-filling tank as a force-applying connection structure, and multiple evenly distributed pull rings are welded to the bottom of the multiple crossbeams.

3. The liquid filling tank calibration method according to claim 1, characterized in that: In step B, a hydraulic cylinder is used as the force-applying component, and the upper and lower ends of the hydraulic cylinder are respectively connected to a U-shaped seat.

4. The liquid filling tank calibration method according to claim 1, characterized in that: In step D, the tension sensor is used to measure the tension. The tension sensor is electrically connected to the display to show the tension value. The data measured by the weighing sensor is processed by the PLC and output as a weighing value in the same unit as the tension value output by the tension sensor.

5. The liquid filling tank calibration method according to claim 4, characterized in that: In step E, if the tensile force value and the weighing value are the same, the liquid tank is weighed accurately; if there is a difference between the tensile force value and the weighing value, there is a deviation in the weighing of the liquid tank.

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