A device and method for online calibration of differential pressure liquid level meters

Abstract

The application discloses a device and a calibration method for online calibration of a differential pressure liquid level meter. The device comprises a base, a calibration part and a reference part. The calibration part comprises a spring, a displacement transmission mechanism and a limiting plate. The spring is connected with the base. The spring, the displacement transmission mechanism, a supporting column and a mounting platform are connected in sequence. The limiting plate is arranged in the middle part of the displacement transmission mechanism. The limiting plate fixing platform is arranged on the top of the supporting column. The limiting plate fixing platform is provided with a through hole. The side of the through hole is respectively provided with a limiting plate movable slot and a limiting plate clamping slot. The reference part comprises a test reference supporting rod, a displacement adjusting mechanism and a test reference mechanism. The displacement adjusting mechanism is connected with the test reference supporting rod. One end of the test reference mechanism fixing part is connected with the test reference supporting rod. The other end is used for fixing the test reference mechanism. The calibration method comprises the steps of calibrating the differential pressure liquid level meter by using the device. The application can solve the problem that the differential pressure liquid level meter cannot be calibrated online.

Description

Technical Field

[0001] This invention relates to the field of metrology and calibration technology, and in particular to an apparatus and method for online calibration of differential pressure level gauges. Background Technology

[0002] Currently, health monitoring of large structures such as bridges, tunnels, structural engineering, and water conservancy projects is becoming increasingly widespread. However, there is still no effective way to recalibrate the monitoring elements after they are installed on the components. The current practice is usually to remove the monitoring elements and send them to a calibration / verification institution for calibration, and then reinstall them in their original positions. This operation leads to gaps and discontinuities in the data acquired by the monitoring elements before and after the calibration. This is especially true for differential pressure level gauges, as the removal of the differential pressure level gauge results in the loss of the medium (liquid) in the connecting pipeline, which will have a significant impact on the subsequent monitoring data of the entire monitoring system. To solve this engineering application problem, this invention designs an auxiliary installation device for monitoring elements and a method for subsequent online calibration, effectively solving this technical problem. Summary of the Invention

[0003] The purpose of this invention is to provide an apparatus and method for online calibration of differential pressure level gauges, which can effectively solve the problem that differential pressure level gauges cannot be calibrated online.

[0004] To achieve the above objectives, the technical solution of the present invention is as follows:

[0005] An online calibration device for a differential pressure level gauge includes a base, a calibration section, and a reference section. The calibration section includes a bracket, a spring, a support column, a mounting platform, a displacement transmission mechanism, and limiting plates. The lower end of the spring is connected to the base, and the upper end is connected to the displacement transmission mechanism. The support column is connected to the displacement transmission mechanism, and the mounting platform is connected to the support column. The limiting plates are located on both sides of the top of the spring, the middle of the displacement transmission mechanism, and the bottom of the support column. The lower end of the bracket is connected to the base, and the top has a limiting plate fixing platform. A through hole is provided in the middle of the limiting plate fixing platform to accommodate the vertical movement of the support column and the displacement transmission mechanism. Limiting plates are provided on opposite sides of the through hole to accommodate the vertical movement of the limiting plates. The movable groove has a limiting plate slot on each of its opposite sides to prevent the limiting plate from moving downwards. The reference part includes a test reference support rod, a displacement adjustment mechanism, a test reference mechanism fixing component, and a test reference mechanism. The lower end of the test reference support rod is fixed to the base. The displacement adjustment mechanism is connected to the test reference support rod and can move up and down along the test reference support rod under external force. One end of the displacement adjustment mechanism can be inserted into the mounting slot of the displacement transmission mechanism. One end of the test reference mechanism fixing component is detachably connected to the test reference support rod or the base, and the other end can be adjusted to extend below the mounting platform and is provided with a mounting hole for fixing the test reference mechanism. The test reference mechanism can measure the displacement of the mounting platform.

[0006] Furthermore, the test reference support rod is provided with external threads, and the displacement adjustment mechanism includes an upper adjusting nut, a lower adjusting nut, and a displacement adjustment rod. The displacement adjustment rod includes a sleeve part and an adjusting rod part. The sleeve part is sleeved around the test reference support rod, and the upper adjusting nut and lower adjusting nut are respectively provided on the top and bottom to be screwed into the test reference support rod. The adjusting rod part is connected to one side of the sleeve part, and one end of the adjusting rod part can be inserted into the mounting groove of the displacement transmission mechanism.

[0007] Furthermore, the test reference mechanism fixing component includes a test reference mechanism fixing part, a test reference mechanism connecting rod part, and a test reference mechanism mounting part. The fixing part can be matched and connected to the test reference support rod part. One end of the connecting rod part is connected to the fixing part, and the other end is connected to the test reference mechanism mounting part. The test reference mechanism mounting part has mounting holes for fixing the test reference mechanism.

[0008] Furthermore, the test reference device is a dial indicator, a micrometer, or a displacement sensor.

[0009] Furthermore, the test reference support rod is an iron rod, and the fixing part of the test reference mechanism is magnetic; or both the test reference support rod and the fixing part of the test reference mechanism are provided with magnetic adsorption components.

[0010] Furthermore, the support includes a support column and a limiting plate fixing platform. The lower end of the support column is connected to the base, and the upper end is connected to the limiting plate fixing platform.

[0011] Furthermore, a locking block is provided at the lower part of the limiting plate slot, and the locking block is provided with a slot fixing hole. The limiting plate is provided with a corresponding limiting plate fixing hole. The limiting plate fixing member passes through the limiting plate fixing hole and the slot fixing hole to fix the limiting plate and the locking block together.

[0012] Furthermore, the support column is vertically connected to the mounting platform.

[0013] The limiting plate is located in the middle of the displacement transmission mechanism, dividing the displacement transmission mechanism into upper and lower parts. Each of the upper and lower parts of the displacement transmission mechanism can be provided with a mounting slot.

[0014] An online calibration method for a differential pressure level gauge includes the following steps:

[0015] Fix the differential pressure level gauge to be calibrated onto the mounting platform, ensuring the limiting plate is positioned within its movable slot. Insert one end of the displacement adjustment mechanism into the mounting slot of the displacement transmission mechanism. Fix the test reference mechanism fixing member to one side of the test reference support rod or the base. Fix the test reference mechanism to the fixing member, adjusting the angle to ensure it is perpendicular to the mounting platform and the base, with the test probe of the test reference mechanism touching the bottom surface of the mounting platform. Adjust the height of the mounting platform by adjusting the height of the displacement adjustment mechanism, simultaneously reading data from the test reference mechanism and the differential pressure level gauge. Compare the data from the test reference mechanism to analyze the test accuracy of the differential pressure level gauge and adjust its accuracy accordingly.

[0016] The above-described online calibration device for differential pressure level gauges involves installing the base to a suitable position on the component. During calibration, the limiting plate is placed below the limiting plate fixing platform. The height of the installation platform is adjusted multiple times using the displacement transmission mechanism and displacement adjustment mechanism. By comparing the measurement data with the test reference mechanism, the measurement data of the differential pressure level gauge can be calibrated online. During monitoring, the limiting plate is fixed in the limiting plate slot of the limiting plate fixing platform, ensuring that the installation platform returns to its original state, thus enabling the differential pressure level gauge to monitor the health of large structures. This invention is applicable to differential pressure level gauges that use the differential pressure principle to test displacement, and it has the following advantages:

[0017] (1) The present invention can realize online calibration of differential pressure level gauge, which only affects the monitoring data during the calibration period. After the calibration, the data collected by the monitoring element is consistent with that before calibration. The calibration does not require the element to be calibrated to be removed from the system. Therefore, the calibration work has no impact on the entire system, which avoids the defect of the entire system changing due to the calibration of a certain element.

[0018] (2) During the later calibration, the limiting plate is rotated 90° and passed through the limiting plate moving slot to the limiting plate fixing platform so that it is placed below the limiting plate fixing platform. The differential pressure level gauge can then be adjusted to different test heights through the displacement transmission mechanism and the displacement adjustment mechanism. After calibration, the limiting plate is placed back into the limiting plate slot, and the differential pressure level gauge will return to the state before calibration. The entire operation process has no impact on the system.

[0019] (3) The present invention has a simple structure, reasonable design, low cost of use and convenient operation. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the monitoring status of the present invention.

[0021] Figure 2 This is a three-dimensional structural diagram of the calibration state of the present invention.

[0022] In the diagram, 1 is the base, 2 is the support column, 3 is the spring, 4 is the limiting plate fixing platform, 5 is the limiting plate movable groove, 6 is the displacement transmission mechanism, 7 is the support column, 8 is the mounting platform, 9 is the differential pressure level gauge, 10 is the limiting plate, 11 is the test reference support rod, 12 is the upper adjusting nut, 13 is the displacement adjusting rod, 14 is the lower adjusting nut, 15 is the dial indicator, 16 is the test reference mechanism fixing part, and 17 is the limiting plate slot. Detailed Implementation

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to specific embodiments and accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0024] In the description of this invention, it should be noted that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed when in use. They are only used to facilitate the description of this invention and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0025] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0026] A device for online calibration of differential pressure level gauges, such as Figure 1 and 2As shown, the system includes a base 1, a calibration section, and a reference section. The calibration section includes a bracket, a spring 3, a support column 7, a mounting platform 8, a displacement transmission mechanism 6, and a limiting plate 10. The lower end of the spring 3 is connected to the base 1, and the upper end is connected to the displacement transmission mechanism 6. The support column 7 is connected to the displacement transmission mechanism 6, and the mounting platform 8 is connected to the support column 7. The mounting platform 8 is used to fix the differential pressure level gauge 9. The limiting plate 10 is located on both sides of the top of the spring 3, the middle of the displacement transmission mechanism 6, or the bottom of the support column 7. The lower end of the bracket is connected to the base 1, and the top has a limiting plate fixing platform 4. The limiting plate fixing platform 4 has a passage in the middle to accommodate the vertical movement of the support column 7 and the displacement transmission mechanism 6. The through hole has movable grooves 5 on opposite sides to accommodate the vertical movement of the limiting plate 10, and additional grooves 17 on opposite sides to hold the limiting plate 10 in place for downward movement. The limiting plate grooves 17 are used to fix the limiting plate 10 during differential pressure level gauge monitoring, thus keeping the differential pressure level gauge 9 in a fixed state. The movable grooves 5 accommodate the limiting plate 10 as it passes through the limiting plate fixing platform 4 and moves below it during calibration, facilitating height adjustment of the mounting platform 8. It should be noted that when the limiting plate 10 is in the limiting plate groove 17 of the limiting plate fixing platform 4, the mounting platform 8 is in a fixed position. The differential pressure level gauge 9 installed on the platform 8 is in monitoring operation. At this time, the spring 3 must be under tension, with a tension of approximately 20% of the maximum allowable tension. When the limiting plate 10 is in the limiting plate movable groove 5, the height of the mounting platform 8 is controlled by the stiffness of the spring 3, and the height of the differential pressure level gauge 9 will be in a transient state. In addition, the spring 3, the displacement transmission mechanism 6, and the support column 7 are on the same line. The displacement transmission mechanism 6 or the support column 7 passes through the limiting plate fixing platform 4 and maintains a perpendicular state to the base 1 and the limiting plate fixing platform 4 to facilitate the calculation of vertical displacement. The reference part includes the test reference support rod 11, the displacement adjustment mechanism, and the test reference mechanism fixing part 1. 6. The test reference mechanism has a test reference support rod 11, the lower end of which is fixed on the base 1 and located on one side of the spring 3. The displacement adjustment mechanism is connected to the test reference support rod 11 and can move up and down along the test reference support rod 11 under the action of external force. One end of the test reference mechanism can be matched and inserted into the mounting groove of the displacement transmission mechanism 6. One end of the test reference mechanism fixing part 16 is detachably connected to the test reference support rod 11 or the base 1, and the other end can be adjusted to extend below the mounting platform 8. It is provided with mounting holes for fixing the test reference mechanism. The test reference mechanism can measure the displacement of the mounting platform 8. The displacement of the mounting platform 8 measured by the test reference mechanism is used as the standard for measuring and calibrating the differential pressure level gauge 9.

[0027] Furthermore, this embodiment provides a displacement adjustment mechanism for convenient height adjustment. The test reference support rod 11 is provided with an external thread, the length of which is set to meet the testing standard of the differential pressure level gauge 9. The displacement adjustment mechanism includes an upper adjusting nut 12, a lower adjusting nut 14, and a displacement adjustment rod 13. The displacement adjustment rod 13 includes a sleeve part and an adjusting rod part. The sleeve part is sleeved around the test reference support rod 11 and can rotate around it. The upper adjusting nut 12 and the lower adjusting nut 14 are respectively provided on the top and bottom to match and screw into the test reference support rod 11. One side of the sleeve part is connected to the adjusting rod part, and one end of the adjusting rod part can be matched and inserted into the mounting groove of the displacement transmission mechanism 6. When inserted, the sleeve part cannot rotate freely. By rotating the upper adjusting nut 12 and the lower adjusting nut 14, the height of the displacement adjustment rod 13 can be adjusted, thereby adjusting the height of the displacement transmission mechanism 6 and thus adjusting the height of the differential pressure level gauge 9.

[0028] Furthermore, the test reference mechanism fixing part 16 includes a test reference mechanism fixing part, a test reference mechanism connecting rod part, and a test reference mechanism mounting part. The test reference mechanism fixing part can be matched and connected to the test reference support rod 11 part. One end of the test reference mechanism connecting rod part is connected to the test reference mechanism fixing part, and the other end is connected to the test reference mechanism mounting part. The test reference mechanism mounting part has mounting holes for fixing the test reference mechanism. The test reference mechanism connecting rod part can be easily adjusted in angle and position so that the test reference mechanism can be adjusted to be below the mounting platform 8 and perpendicular to the mounting platform 8.

[0029] Furthermore, the test reference mechanism can be a dial indicator, micrometer, or displacement sensor. This embodiment provides a preferred test reference mechanism that is convenient for testing while better ensuring test accuracy. The test reference mechanism is a dial indicator 15, which has a measuring rod. The measuring probe at the top of the measuring rod contacts the mounting platform 8. The test reference mechanism fixing member 16 can clamp the sleeve that covers the measuring rod. During testing, the measuring rod extends or retracts to measure the displacement of the mounting platform 8, while the positions of the indicator and the sleeve do not change. If a micrometer or displacement sensor is used, the operation is similar.

[0030] Furthermore, various methods can be used to connect the test reference mechanism fixing part 16 to the test reference support rod 11 or the base 1, such as bolt connection or snap-fit ​​connection. However, this embodiment provides a connection method for the test reference support rod 11 and the test reference mechanism fixing part 16 that is easy to disassemble. The test reference support rod 11 is an iron rod, and the fixing part of the test reference mechanism is magnetic. The test reference mechanism is magnetically attracted to the bottom of the test reference support rod 11 at a position without external threads, or magnetic adsorption components are provided on both the test reference support rod 11 and the fixing part of the test reference mechanism. In this way, the connection between the test reference support rod 11 and the test reference mechanism fixing part 16 can be achieved by magnetic adsorption.

[0031] Furthermore, the support includes a support pole 2 and a limiting plate fixing platform 4. The lower end of the support pole 2 is connected to the base 1, and the upper end is connected to the limiting plate fixing platform 4. It can be fixed by bolts and nuts. Generally, the limiting plate fixing platform 4 is in a horizontal state to keep the installation platform 8 in a horizontal state during monitoring. This structure facilitates the assembly, disassembly and transportation of the support.

[0032] Furthermore, a locking block is provided at the lower part of the limiting plate slot 17, and the locking block is provided with a slot fixing hole. The limiting plate 10 is provided with a corresponding limiting plate fixing hole. The limiting plate fixing component passes through the limiting plate fixing hole and the slot fixing hole to fix the limiting plate 10 and the locking block together. The limiting plate fixing component can be bolts and nuts. The limiting plate 10 is placed on top of the locking block, and the limiting plate 10 and the limiting plate slot 17 are fastened together with bolts and nuts. In this way, the installation platform 8 will no longer move.

[0033] Furthermore, the support column 7 is vertically connected to the mounting platform 8, so that the data from the differential pressure level gauge 9 and the dial gauge 15 can be directly obtained without further processing.

[0034] For the installation of the limiting plate 10, it is more suitable to set it on both sides of the middle of the displacement transmission mechanism 6. The limiting plate 10 divides the displacement transmission mechanism 6 into upper and lower parts. The upper part and the lower part of the displacement transmission mechanism 6 can each be provided with a mounting slot. In the calibration state, when the limiting plate 10 is located below the limiting plate fixing platform 4, that is, as Figure 2 As shown, the adjusting rod portion of the displacement adjusting rod 13 is inserted into the lower mounting groove. When the limiting plate 10 is located at or above the position of the limiting plate fixing platform 4, the adjusting rod portion of the displacement adjusting rod 13 is inserted into the upper mounting groove.

[0035] The installation of the above device includes the following steps: (1) The processing and connection of the support rod 2, spring 3, test reference support rod 11 and base 1 are all customized by the factory; (2) Install base 1 on the surface of the monitored part; after installing base 1 to the appropriate position of the component, install upper adjusting nut 12, lower adjusting nut 14 and displacement adjusting rod 13; (3) Install the limiting plate fixing platform 4 on the top of the support rod 2. (4) Install the limiting plate 10 and displacement transmission device on spring 3, and fix the support column 7 and installation platform 8 on the displacement transmission device in sequence. (5) Install differential pressure level gauge 9 and firmly install differential pressure level gauge 9 on instrument installation platform 8. (6) Pull the limiting plate 10 up, at which time spring 3 generates tension, the tension is about 20% of the allowable tension of spring 3, put the limiting plate 10 into the limiting plate slot 17 of the limiting plate fixing platform 4 and fix it temporarily to prevent the limiting plate 10 from sliding out. (7) Connect all lines and pipelines, pass through the medium, and complete the installation. The computer can collect the data of the differential pressure level gauge 9, such as the Changsha Jinma Integrated Tester.

[0036] When the device of this embodiment is used to calibrate the differential pressure level gauge 9, such as Figure 2 As shown, the specific steps include: (1) fixing the differential pressure level gauge 9 to be calibrated onto the mounting platform 8, so that the limiting plate 10 is in a state that can pass through the movable groove 5 of the limiting plate. Under the action of gravity, the limiting plate 10 of the differential pressure level gauge 9 descends to a certain height. After the height is stable, one end of the displacement adjustment mechanism is inserted into the mounting groove of the displacement transmission mechanism 6 and locked in place; (2) fixing the test reference mechanism fixing piece 16 to one side of the test reference support rod 11 at an appropriate height or onto the base 1, and fixing the test reference mechanism to the test reference. (2) Adjust the angle of the test reference mechanism fixing part 16 on one side of the reference mechanism fixing part 16 so that the test reference mechanism 15 is perpendicular to the installation platform 8, and the test probe of the test reference mechanism touches the bottom surface of the installation platform 8; (3) Read the data of the differential pressure level gauge 9 and the dial gauge 15. The data of the dial gauge 15 can be read through the dial, and the data of the differential pressure level gauge 9 can be collected through the computer. This data is used as the initial data for calibration when the differential pressure level gauge 9 drops; (4) Adjust the upper adjusting nut 12 and the lower adjusting nut 14 downwards. At this time, it is equivalent to The structure descends, the displacement adjustment mechanism descends, and thus the height of the differential pressure level gauge 9 is adjusted. After adjustment, the data of the differential pressure level gauge 9 and the dial gauge 15 are read simultaneously; (5) Repeat the work of step (4), and read the data of the differential pressure level gauge 9 and the dial gauge 15 once each adjustment. After the planned displacement is reached, the calibration data collection of the descent of the differential pressure level gauge 9 is completed; (6) The displacement adjustment mechanism is pulled out from the mounting slot, and the limit plate 10 is returned to the initial state; (7) Read the differential pressure level gauge 9 and the dial gauge 15 in the initial state of step (6). (5) The data is used as the initial data for calibration when the differential pressure level gauge 9 rises; (8) Adjust the upper adjusting nut 12 and the lower adjusting nut 14 upwards. At this time, it is equivalent to the structure rising and the displacement adjustment mechanism rising, thereby achieving the purpose of adjusting the height of the differential pressure level gauge 9. After the adjustment is completed, the data of the differential pressure level gauge 9 and the dial gauge 15 are read at the same time; (9) Repeat the work of step (8). Read the data of the differential pressure level gauge 9 and the dial gauge 15 once for each adjustment. After the planned displacement is reached, the calibration data collection of the differential pressure level gauge 9 rises is completed. (10) Analyze and evaluate the collected data of the differential pressure level gauge 9 and the dial gauge 15. Analyze the test accuracy of the differential pressure level gauge 9 and obtain the online calibration result of the differential pressure level gauge 9. If necessary, the correction parameters of the differential pressure level gauge 9 can be proposed.

[0037] When the above-mentioned device is performing monitoring, such as Figure 1As shown, by fixing the limiting plate 10 in the limiting plate slot 17 of the limiting plate fixing platform 4, the installation platform 8 can be guaranteed to return to its original state. Since the differential pressure level gauge 9 is fastened to the installation platform 8, when the displacement of the component changes, the position of the differential pressure level gauge 9 will also change with the base 1 and the installation platform 8, thereby realizing the health monitoring of the large structure by the differential pressure level gauge 9.

Claims

1. A device for online calibration of differential pressure level gauges, characterized in that: The system includes a base, a calibration section, and a reference section. The calibration section includes a bracket, a spring, a support column, a mounting platform, a displacement transmission mechanism, and a limiting plate. The lower end of the spring is connected to the base, and the upper end is connected to the displacement transmission mechanism. The support column is connected to the displacement transmission mechanism, and the mounting platform is connected to the support column. The limiting plate is located on both sides of the top of the spring, the middle of the displacement transmission mechanism, and the bottom of the support column. The lower end of the bracket is connected to the base, and the top has a limiting plate fixing platform. The limiting plate fixing platform has a through hole in its middle to accommodate the vertical movement of the support column and the displacement transmission mechanism. Opposite sides of the through hole have limiting plate movable grooves to accommodate the vertical movement of the limiting plate. The two sides of the device are provided with limiting plate slots to prevent the limiting plate from moving downwards; the reference part includes a test reference support rod, a displacement adjustment mechanism, a test reference mechanism fixing component, and a test reference mechanism. The lower end of the test reference support rod is fixed to the base. The displacement adjustment mechanism is connected to the test reference support rod and can move up and down along the test reference support rod under external force. One end of the displacement adjustment mechanism can be inserted into the mounting slot of the displacement transmission mechanism. One end of the test reference mechanism fixing component is detachably connected to the test reference support rod or the base, and the other end can be adjusted to extend below the mounting platform and is provided with mounting holes for fixing the test reference mechanism. The test reference mechanism can measure the displacement of the mounting platform.

2. The device for online calibration of differential pressure level gauges according to claim 1, characterized in that: The test reference support rod is provided with external threads. The displacement adjustment mechanism includes an upper adjusting nut, a lower adjusting nut, and a displacement adjustment rod. The displacement adjustment rod includes a sleeve part and an adjusting rod part. The sleeve part is sleeved around the test reference support rod. The upper adjusting nut and the lower adjusting nut are respectively provided on the top and bottom to be screwed into the test reference support rod. The adjusting rod part is connected to one side of the sleeve part. One end of the adjusting rod part can be inserted into the mounting groove of the displacement transmission mechanism.

3. The device for online calibration of differential pressure level gauges according to claim 1, characterized in that: The test reference mechanism fixing component includes a test reference mechanism fixing part, a test reference mechanism connecting rod part, and a test reference mechanism mounting part. The fixing part can be matched and connected to the test reference support rod part. One end of the connecting rod part is connected to the fixing part, and the other end is connected to the test reference mechanism mounting part. The test reference mechanism mounting part has mounting holes for fixing the test reference mechanism.

4. The apparatus for online calibration of differential pressure level gauges according to claim 1, characterized in that: The test reference device is a dial indicator, a micrometer, or a displacement sensor.

5. The apparatus for online calibration of differential pressure level gauges according to claim 3, characterized in that: The test reference support rod is an iron rod, and the fixing part of the test reference mechanism is magnetic; Alternatively, both the test reference support rod and the fixed part of the test reference mechanism may be equipped with magnetic adsorption components.

6. The apparatus for online calibration of differential pressure level gauges according to claim 1, characterized in that: The support includes a support pole and a limiting plate fixing platform. The lower end of the support pole is connected to the base, and the upper end is connected to the limiting plate fixing platform.

7. The apparatus for online calibration of differential pressure level gauges according to claim 1, characterized in that: The lower part of the limiting plate slot is provided with a locking block, and the locking block is provided with a slot fixing hole. The limiting plate is provided with a corresponding limiting plate fixing hole. The limiting plate fixing member passes through the limiting plate fixing hole and the slot fixing hole to fix the limiting plate and the locking block together.

8. The apparatus for online calibration of differential pressure level gauges according to claim 1, characterized in that: The support column is vertically connected to the installation platform.

9. The apparatus for online calibration of differential pressure level gauges according to claim 1, characterized in that: The limiting plate is located in the middle of the displacement transmission mechanism, dividing the displacement transmission mechanism into upper and lower parts. Each of the upper and lower parts of the displacement transmission mechanism can be provided with a mounting slot.

10. An online calibration method using the apparatus for calibrating a differential pressure level gauge according to any one of claims 1-9, characterized in that... Includes the following steps: Fix the differential pressure level gauge to be calibrated onto the mounting platform, ensuring the limiting plate can pass through its movable slot. Insert one end of the displacement adjustment mechanism into the mounting slot of the displacement transmission mechanism. Fix the test reference mechanism fixing member to one side of the test reference support rod or the base, and fix the test reference mechanism to the fixing member. Adjust the angle of the fixing member so that the test reference mechanism is perpendicular to the mounting platform and the base, with the test probe of the test reference mechanism touching the bottom surface of the mounting platform. Adjust the height of the mounting platform by adjusting the height of the displacement adjustment mechanism, simultaneously read the data from the test reference mechanism and the differential pressure level gauge, compare the data from the test reference mechanism, analyze the test accuracy of the differential pressure level gauge, and adjust the accuracy of the differential pressure level gauge accordingly.

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