Liquid level meter calibrating device

Abstract

The utility model provides a liquid level meter calibrating device, which belongs to the technical field of liquid level meter calibration, and comprises a lifting mechanism, a detection cylinder and a communicating vessel, and the detection cylinder is connected with a liquid level meter to be calibrated; the detection cylinder is connected with a standard liquid level meter; the communicating vessel is connected with the lifting mechanism, and the lifting mechanism drives the communicating vessel to move in the liquid level lifting direction; and the detection cylinder is communicated with the communicating vessel. According to the liquid level meter calibrating device, the number of times of manually reading liquid level values is reduced, influence factors of personal errors are reduced to a certain degree, the calibrating precision is improved, and meanwhile the calibrating time is shortened.

Description

Technical Field

[0001] This utility model belongs to the field of liquid level gauge calibration technology, specifically a liquid level gauge calibration device. Background Technology

[0002] A level gauge is a pressure sensor that measures liquid level. It is based on the principle that the static pressure of the liquid is proportional to the height of the liquid. It uses an isolated diffused silicon sensing element or a ceramic capacitive pressure sensing sensor to convert the static pressure into an electrical signal. After temperature compensation and linear correction, it is converted into a standard electrical signal to measure the liquid level. It is widely used in various liquid media measurement systems and industries such as petrochemical, metallurgy, power, pharmaceutical, water supply and drainage, and environmental protection.

[0003] The calibration of level gauges is a crucial step in ensuring their stable and reliable operation, and is key to guaranteeing the accuracy of industrial production. Currently, level gauge calibration methods mainly employ the gauging method or manual comparison using high-accuracy level gauges. See patent application CN201911362931.5, which discloses a level gauge calibration device. Specifically, during calibration, the return water solenoid valve is closed, the inlet water solenoid valve is opened, and a submersible pump is started to draw water from a storage tank. The water flows through inlet pipes into the straight-pipe multi-range level gauge container, the standard level gauge container, the tubular measuring cylinder, and the tiltable level gauge container. The liquid level in each container is adjusted by controlling the inlet solenoid valves. The container liquid levels are aligned with the calibration points of the level gauge under test, and the corresponding output values ​​of the standard level gauge are read and compared. It can be seen that existing technologies mostly rely on manual reading and comparison of liquid level values, resulting in long calibration times and poor calibration accuracy. Utility Model Content

[0004] In view of the above-described background technology, in the prior art, the liquid level gauge is mostly calibrated by manually reading and comparing the liquid level value, which has the technical problems of long calibration time and poor calibration accuracy. In order to address this technical problem, this utility model proposes a liquid level gauge calibration device.

[0005] This invention features at least one detection point on the detection cylinder along the liquid level rise / fall direction. The distance the lifting mechanism moves the communicating vessel along this direction can be determined based on the distance between two adjacent detection points. The liquid level at the moved detection point is used as a standard liquid level and compared with the liquid level of the level gauge to be calibrated, thereby achieving the calibration of the level gauge. This level gauge calibration device reduces the number of manual liquid level readings, reduces the influence of human error to a certain extent, improves calibration accuracy, and shortens calibration time.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] This utility model discloses a liquid level gauge calibration device, comprising a lifting mechanism, a detection cylinder, and a communicating vessel, wherein a liquid level gauge to be calibrated is connected to the detection cylinder; and a standard liquid level gauge is connected to the detection cylinder.

[0008] The communicating vessel is connected to the lifting mechanism, and the lifting mechanism drives the communicating vessel to move along the direction of liquid level rise and fall.

[0009] The detection cylinder is connected to the communicating vessel.

[0010] Further defined, the detection cylinder includes a first medium detection cylinder and a second medium detection cylinder, and the communicating vessel includes a first medium communicating cavity communicating with the first medium detection cylinder and a second medium communicating cavity communicating with the second medium detection cylinder.

[0011] Furthermore, the liquid level gauge calibration device also includes a first medium storage tank and a second medium storage tank, wherein the first medium detection cylinder and the first medium communication cavity are both connected to the first medium storage tank, and the second medium detection cylinder and the second medium communication cavity are both connected to the second medium storage tank.

[0012] Further specified, a first medium pump is provided at the outlet of the first medium storage tank, and the first medium storage tank is connected to the first medium detection cylinder through the first medium pump; a second medium pump is provided at the outlet of the second medium storage tank, and the second medium storage tank is connected to the second medium detection cylinder through the second medium pump.

[0013] Further specifying, the level gauge calibration device also includes a fixed frame, a first clamping ring, and a second clamping ring. The fixed frame is detachably connected to the top of the first medium detection cylinder and the top of the second medium detection cylinder, respectively. The first clamping ring connects the level gauge to be calibrated to the first medium detection cylinder, and the second clamping ring connects the level gauge to be calibrated to the second medium detection cylinder.

[0014] Further defining the lifting mechanism, the lifting mechanism includes a drive component, a lead screw, and a movable support plate. The power output end of the drive component is connected to the movable support plate, the lead screw is threadedly connected to the movable support plate, and the communicating vessel is connected to the movable support plate.

[0015] Furthermore, the lifting mechanism also includes a linear guide rail arranged parallel to the lead screw, and the movable pallet is slidably connected to the linear guide rail.

[0016] Furthermore, the lifting mechanism also includes a column arranged parallel to the lead screw, and the movable support plate is slidably connected to the column.

[0017] Furthermore, the lifting mechanism also includes a magnetic scale connected to the column, which is used to measure the distance the communicating vessel moves along the direction of liquid level rise and fall.

[0018] Furthermore, a standard level gauge is connected to the communicating vessel.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0020] 1. The liquid level gauge calibration device of this utility model has at least one detection point set on the detection cylinder along the direction of liquid level rise and fall. The distance that the lifting mechanism drives the communicating vessel to move along the direction of liquid level rise and fall can be determined based on the distance between two adjacent detection points. The liquid level at the moved detection point is used as the standard liquid level and compared with the detection liquid level of the liquid level gauge to be calibrated at the detection point for calculation, thereby realizing the calibration of the liquid level gauge. The liquid level gauge calibration device of this utility model reduces the number of times the liquid level value is read manually, reduces the influence of human error to a certain extent, improves the calibration accuracy, and shortens the calibration time.

[0021] 2. The lifting mechanism of this utility model also includes a linear guide rail, which is slidably connected to the movable pallet. By setting the linear guide rail, the stability of the movable pallet driving the communicating vessel to move along the direction of liquid level rise and fall is improved.

[0022] 3. The lifting mechanism of this utility model also includes a column and a magnetic scale connected to the column. The column is used to fix the magnetic scale and provide a moving fulcrum for the magnetic scale, further improving the stability of the moving pallet driving the communicating vessel to move along the liquid level lifting direction; the magnetic scale is used to measure the distance the communicating vessel moves along the liquid level lifting direction, improving the accuracy of the communicating vessel movement, and thus improving the accuracy of the liquid level gauge calibration. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the liquid level gauge calibration device of this utility model. Figure 1 ;

[0024] Figure 2 This is a schematic diagram of the structure of the liquid level gauge calibration device of this utility model. Figure 2 ;

[0025] Among them, 1-lifting mechanism, 101-column, 102-magnetic scale, 103-linear guide rail, 104-screw, 105-moving pallet, 2-detection cylinder, 201-first medium detection cylinder, 202-second medium detection cylinder, 3-fixed base, 4-first medium storage tank, 5-second medium storage tank, 6-first medium pump, 7-second medium pump, 8-communicating device, 9-standard level gauge, 10-fixed frame, 11-first clamping ring, 12-second clamping ring. Detailed Implementation

[0026] The technical solution of this utility model will be further explained and described below with reference to the accompanying drawings and embodiments, but this utility model is not limited to the embodiments described below.

[0027] See Figure 1 and Figure 2 This utility model discloses a liquid level gauge calibration device, comprising a lifting mechanism 1, a detection cylinder 2, and a communicating vessel 8. The detection cylinder 2 is connected to a liquid level gauge to be calibrated, and at least one detection point is provided on the detection cylinder 2 along the direction of liquid level rise and fall. The communicating vessel 8 is connected to the lifting mechanism 1, and the lifting mechanism 1 drives the communicating vessel 8 to move along the direction of liquid level rise and fall. The detection cylinder 2 is connected to the communicating vessel 8. Specifically, the lifting mechanism 1 and the detection cylinder 2 are arranged side by side. The detection cylinder 2 is used to hold the liquid medium. A fixing seat 3 is provided at the bottom of both the lifting mechanism 1 and the detection cylinder 2 to support them.

[0028] In this utility model, the fixed base 3 can be a fixed bracket, a fixed block, a fixed platform, etc. Any structure that can support the lifting mechanism 1 and the detection cylinder 2 is acceptable. As a preferred embodiment of this utility model, the fixed base 3 is a tripod.

[0029] In this invention, the detection cylinder 2 can be any structure capable of holding a liquid medium, such as a cylindrical cylinder or prismatic cylinder, and capable of connecting to the level gauge to be calibrated. As a preferred embodiment of this invention, the detection cylinder 2 is a cylindrical cylinder. More preferably, this invention provides a viewing window on the detection cylinder 2.

[0030] In this invention, the communicating vessel 8 can be any type of container for holding liquids. In a preferred embodiment, the communicating vessel 8 has a cylindrical structure. More preferably, the communicating vessel 8 is provided with a viewing window.

[0031] In this utility model, the lifting mechanism 1 can be any device that can move an object up and down, which is easy for those skilled in the art to conceive of. It can be a device that moves up and down while suspended, or a device that drives the object up and down.

[0032] In this invention, the detection cylinder 2 includes a first medium detection cylinder 201 and a second medium detection cylinder 202. The communicating vessel 8 includes a first medium communicating cavity communicating with the first medium detection cylinder 201 and a second medium communicating cavity communicating with the second medium detection cylinder 202. Specifically, the communicating vessel 8 is divided into two cavities, one of which serves as the first medium communicating cavity and the other as the second medium communicating cavity. Connecting the first medium detection cylinder 201 to the first medium communicating cavity and the second medium detection cylinder 202 to the second medium communicating cavity allows for the simultaneous calibration of level gauges containing two different media, significantly improving calibration efficiency. The first medium detection cylinder 201 and the second medium detection cylinder 202 can simultaneously contain the same liquid medium or two different liquid media, enabling the simultaneous calibration of two identical level gauges or two different level gauges. The liquid medium can be water, oil, or other liquid media used in chemical production. In a preferred embodiment of this invention, the first medium detection cylinder 201 is used to hold water, and the second medium detection cylinder 202 is used to hold oil.

[0033] In this utility model, the liquid level gauge calibration device also includes a first medium storage tank 4 and a second medium storage tank 5. The first medium detection cylinder 201 and the first medium communication cavity are both connected to the first medium storage tank 4, and the second medium detection cylinder 202 and the second medium communication cavity are both connected to the second medium storage tank 5. Specifically, the liquid medium in the first medium storage tank 4 is the same as the liquid medium in the first medium detection cylinder 201 and the liquid medium in the first medium communication cavity. The liquid medium in the second medium storage tank 5 is the same as the liquid medium in the second medium detection cylinder 202 and the liquid medium in the second medium communication cavity. The first medium storage tank 4 is used to store and supply liquid medium for the first medium detection cylinder 201 and the first medium communication cavity. At the same time, during the movement of the communicating vessel 8 along the liquid level rise and fall direction, the liquid medium in the first medium communication cavity and the liquid medium in the first medium detection cylinder 201 are returned (naturally returned by gravity) to the first medium storage tank 4. The second medium storage tank 5 is used to store and supply liquid medium for the second medium detection cylinder 202 and the second medium communication cavity. At the same time, during the movement of the communicating vessel 8 along the liquid level rise and fall direction, the liquid medium in the second medium communication cavity and the liquid medium in the second medium detection cylinder 202 are returned (naturally returned by gravity) to the second medium storage tank 5.

[0034] In this invention, the first medium storage tank 4 and the second medium storage tank 5 can be any type of container known to those skilled in the art for holding liquid media.

[0035] In this invention, a first medium pump 6 is installed at the outlet of the first medium storage tank 4, and the first medium storage tank 4 is connected to the first medium detection cylinder 201 through the first medium pump 6. A second medium pump 7 is installed at the outlet of the second medium storage tank 5, and the second medium storage tank 5 is connected to the second medium detection cylinder 202 through the second medium pump 7. The first medium pump 6 is used to pressurize the liquid medium when the first medium storage tank 4 supplies liquid medium to the first medium detection cylinder 201 and the first medium communication cavity; the second medium pump 7 is used to pressurize the liquid medium when the second medium storage tank 5 supplies liquid medium to the second medium detection cylinder 202 and the second medium communication cavity.

[0036] The liquid level gauge calibration device of this utility model further includes a fixed frame 10, a first clamping ring 11, and a second clamping ring 12. The fixed frame 10 is detachably connected to the top of the first medium detection cylinder 201 and the top of the second medium detection cylinder 202, respectively. The first clamping ring 11 connects the liquid level gauge to be calibrated to the first medium detection cylinder 201, and the second clamping ring 12 connects the liquid level gauge to be calibrated to the second medium detection cylinder 202. Specifically, the fixed frame 10, the first medium detection cylinder 201, and the second medium detection cylinder 202 are all arranged side by side, and the first clamping ring 11 and the second clamping ring 12 are fixedly connected to the top of the fixed frame 10 for connecting the liquid level gauge to be calibrated.

[0037] In this invention, the lifting mechanism 1 includes a driving component, a lead screw 104, and a movable support plate 105. The power output end of the driving component is connected to the movable support plate 105, the lead screw 104 is threadedly connected to the movable support plate 105, and the communicating vessel 8 is connected to the movable support plate 105. The driving component is fixedly connected to a fixed base 3 at the bottom of the lifting mechanism 1. The driving component drives the lead screw 104 to rotate, thereby driving the movable support plate 105, which is threadedly connected to the lead screw 104, to move along the liquid level lifting direction. This, in turn, causes the communicating vessel 8 to move along the liquid level lifting direction via the movable support plate 105.

[0038] In this invention, the driving component can be any device that can drive the movable pallet 105 to move along the liquid level lifting direction, such as a servo motor or an electric push rod. As a preferred embodiment, the driving component in this invention is a servo motor, which drives the movable pallet 105 to move along the liquid level lifting direction via the servo motor and the lead screw 104.

[0039] In this invention, the lifting mechanism 1 further includes a linear guide rail 103 arranged parallel to the lead screw 104, and the movable pallet 105 is slidably connected to the linear guide rail 103. The linear guide rail 103 serves to guide the movable pallet 105 and improve the stability of the movable pallet 105 during movement.

[0040] In this invention, the lifting mechanism 1 further includes a column 101 arranged parallel to the lead screw 104, and a movable support plate 105 slidably connected to the column 101. The column 101 provides a fulcrum for the movement of the movable support plate 105.

[0041] In this invention, the lifting mechanism 1 further includes a magnetic scale 102 connected to the column 101. The magnetic scale 102 is used to measure the distance the communicating vessel 8 moves along the liquid level lifting direction. The column 101 is also used to fix the magnetic scale 102.

[0042] In this invention, a standard level gauge 9 is connected to the communicating vessel 8. The data detected by the standard level gauge is compared with the data displayed by the level gauge to be tested to determine the test result. The standard level gauge 9 plays an auxiliary role in the test, and the test results of the level gauge testing device of this invention can also be verified by comparing the test results of the standard level gauge 9 with those of the level gauge to be tested.

[0043] The calibration process of the liquid level gauge calibration device of this utility model is as follows:

[0044] Step 1: The lifting mechanism 1 drives the communicating vessel 8 to rise to the overflow stop height, and the first medium pump 6 and the second medium pump 7 are turned on. The liquid medium enters the corresponding first medium communicating cavity and second medium communicating cavity, as well as the first medium storage tank 4 and the second medium storage tank 5 in the communicating vessel 8, until the liquid level reaches the specified height of the communicating vessel 8, and then the first medium pump 6 and the second medium pump 7 are turned off.

[0045] Step 2: The liquid medium flows back naturally to the first medium storage tank 4 and the second medium storage tank 5 under the action of gravity through the overflow port at the bottom of the communicating vessel 8. The first medium communicating cavity and the second medium communicating cavity are respectively equipped with overflow ports. After the liquid level in the communicating vessel 8 stabilizes, the level gauge being tested displays a height value. According to the provisions of JJG 971-2019 "Verification Procedure for Level Gauges", this value is compared with the height of the detection point of the corresponding first medium detection cylinder 201 and the detection point of the second medium detection cylinder 202 to obtain the verification result of the corresponding detection point.

[0046] Step 3: The lifting mechanism 1 drives the communicating vessel 8 to descend a certain distance until it reaches another detection point of the first medium detection cylinder 201 and another detection point of the second medium detection cylinder 202. Repeat step 2.

[0047] Repeat steps 2 and 3 until all test points are calibrated, and then complete the next step of the calibration.

[0048] Meanwhile, in accordance with the provisions of JJG 971-2019 "Verification Procedure for Level Gauges", the lifting mechanism 1 drives the communicating vessel 8 to rise, and repeats the process opposite to step 2 to complete the upper stroke verification.

[0049] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A liquid level gauge proving device, characterised in that, The liquid level gauge calibration device comprises a lifting mechanism (1), a detection cylinder (2) and a communication device (8), the detection cylinder (2) is connected with a liquid level gauge to be calibrated, and at least one detection point is arranged on the detection cylinder (2) along the liquid level lifting direction; The communication device (8) is connected with the lifting mechanism (1), and the communication device (8) is driven by the lifting mechanism (1) to move along the liquid level lifting direction. The detection cylinder (2) is in communication with the communication device (8).

2. The liquid level gauge proving device of claim 1, wherein, The detection cylinder (2) comprises a first medium detection cylinder (201) and a second medium detection cylinder (202), the communication device (8) comprises a first medium communication cavity in communication with the first medium detection cylinder (201), and a second medium communication cavity in communication with the second medium detection cylinder (202).

3. The liquid level gauge proving device of claim 2, wherein, The liquid level gauge calibration device further comprises a first medium storage tank (4) and a second medium storage tank (5), the first medium detection cylinder (201) and the first medium communication cavity are both in communication with the first medium storage tank (4), and the second medium detection cylinder (202) and the second medium communication cavity are both in communication with the second medium storage tank (5).

4. The liquid level gauge proving device of claim 3, wherein, A first medium pump (6) is arranged at the outlet of the first medium storage tank (4), and the first medium storage tank (4) is in communication with the first medium detection cylinder (201) through the first medium pump (6); a second medium pump (7) is arranged at the outlet of the second medium storage tank (5), and the second medium storage tank (5) is in communication with the second medium detection cylinder (202) through the second medium pump (7).

5. A liquid level gauge proving device according to any one of claims 2 to 4, wherein, The liquid level gauge calibration device further comprises a fixed frame body (10), a first clamping ring (11) and a second clamping ring (12), the fixed frame body (10) is detachably connected with the top of the first medium detection cylinder (201) and the top of the second medium detection cylinder (202) respectively, the first clamping ring (11) connects the liquid level gauge to be calibrated on the first medium detection cylinder (201), and the second clamping ring (12) connects the liquid level gauge to be calibrated on the second medium detection cylinder (202).

6. The liquid level gauge proving device of claim 1, wherein, The lifting mechanism (1) comprises a driving member, a lead screw (104) and a moving plate (105), the power output end of the driving member is connected with the moving plate (105), the lead screw (104) is threadedly connected with the moving plate (105), and the communication device (8) is connected on the moving plate (105).

7. The liquid level gauge proving device of claim 6, wherein, The lifting mechanism (1) further comprises a linear guide rail (103) arranged in parallel with the lead screw (104), and the moving plate (105) is slidably connected with the linear guide rail (103).

8. A liquid level gauge proving device according to claim 6 or 7, characterised in that, The lifting mechanism (1) further comprises a stand column (101) arranged in parallel with the lead screw (104), and the moving plate (105) is slidably connected with the stand column (101).

9. The liquid level gauge proving device of claim 8, wherein, The lifting mechanism (1) further comprises a magnetic grating ruler (102) connected on the stand column (101), and the magnetic grating ruler (102) is used for measuring the distance of the communication device (8) moving along the liquid level lifting direction.

10. The liquid level gauge proving device of claim 1, wherein, The communication device (8) is connected with a standard liquid level gauge (9).

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