Calibration system and calibration method of static level device

Abstract

The present invention relates to a calibration system and a calibration method for a static level device, comprising a constant liquid level reference device, a tray, an electric lifting platform, a mounting bracket, a micrometer, a static level device to be calibrated and a connecting pipe; the constant liquid level reference device comprises a reference chamber, a water replenishing chamber, an automatic water replenishing pump and a liquid pipe, the reference chamber is arranged in the water replenishing chamber, the liquid pipe is serially connected with an automatic water replenishing pump and the two ends of the liquid pipe are respectively connected to the reference chamber and the water replenishing chamber; the lower end of the tray is connected with an electric lifting platform, and the constant liquid level reference device is placed on the tray; the micrometer is mounted on the mounting bracket; the static level device is connected to the reference chamber through a connecting pipe; the electric lifting platform drives the constant liquid level reference device to move in a vertical direction, the automatic water replenishing pump drives the liquid in the water replenishing chamber to be injected into the reference chamber and ensures that the reference chamber is in a full water state, after the constant liquid level reference device completes the vertical displacement, the liquid level of the static level device is always maintained at a constant liquid level in a full water state of the reference chamber.

Description

Technical Field

[0001] The invention relates to the technical field of structure displacement measurement, and in particular to a calibration system and a calibration method for a static leveling device. Background Art

[0002] The static level device is a precision instrument used to measure the relative settlement of each measuring point of a structure. It is mainly used to measure the uneven settlement of each measuring point of pipeline corridors, dams, nuclear power plants, high-rise buildings, foundation pits, tunnels, bridges, subways, etc.

[0003] However, due to the inconsistency of structural processing and assembly of each static level device, there is a certain error between the measured value and the theoretical value of each static level device. Therefore, it is necessary to calibrate the static level device before use to make the measurement value output in actual measurement more accurate.

[0004] Please refer to Figure 1 As shown, at present, the commonly used calibration method of the static level device is: a reference liquid storage tank 100 is set and placed on a displacement platform 101, and a micrometer 102 is set to measure the height H of the displacement platform 101 to adjust the rising of the reference liquid storage tank 100, and the static level 200 to be calibrated is connected with the reference liquid storage tank 100 through a water pipe 103. In the initial state, the liquid level height in the reference liquid storage tank 100 and the liquid level height in the static level 200 are at the same horizontal plane. In order to make the calibration result theoretically accurate, the reference liquid storage tank 100 and the static level 200 to be calibrated are usually set to have the same internal bottom area. In this way, after the height of the reference liquid storage tank 100 is adjusted to H through the displacement platform 101, according to the principle of communicating vessels, the liquid level height in the static level 200 will theoretically change by H / 2. After many experiments, the measured values ​​measured by the static level 200 are fitted with the theoretical values ​​to obtain a fitting function relationship curve, thereby improving the accuracy of the measured values ​​of the static level 200, that is, making the measured values ​​of the static level 200 infinitely close to the theoretical values ​​within the accuracy range.

[0005] However, this calibration method itself has a big problem: the displacement platform 101 adjusts the height change H of the reference liquid storage tank 100, and the theoretical height change value H / 2 of the liquid level in the static level 200 needs to be based on the premise that the reference liquid storage tank 100 and the static level 200 to be calibrated have the same internal bottom area. This basic premise itself has a relative error that is difficult to adjust. Under this error, fitting the measured value of the static level 200 to be calibrated with the theoretical value H / 2 will produce a larger error, making it difficult to ensure the monitoring accuracy requirements.

[0006] Therefore, it is necessary to provide a new calibration system and calibration method for a static level device to solve the above problems. Summary of the invention

[0007] The present invention provides a calibration system and a calibration method for a static level device, so as to realize accurate measurement of the vertical displacement of a structure.

[0008] In order to achieve the above-mentioned object, the present invention provides a calibration system for a static level device, the calibration system for the static level device comprising a constant liquid level reference device, a tray, an electric lifting platform, a mounting bracket, a micrometer, a static level device to be calibrated and a connecting pipe;

[0009] The constant liquid level reference device comprises a reference chamber, a water replenishment chamber, an automatic water replenishment pump and a liquid pipe, wherein the reference chamber is arranged in the water replenishment chamber, the automatic water replenishment pump is connected in series to the liquid pipe, and both ends of the liquid pipe are connected to the reference chamber and the water replenishment chamber respectively;

[0010] The lower end of the tray is connected to an electric lifting platform placed on the calibration platform, and the constant liquid level reference device is placed on the tray;

[0011] The micrometer is mounted on a mounting bracket placed on the calibration table, and the probe on the micrometer contacts the tray;

[0012] The static level device is placed on the calibration platform and is connected to the reference chamber of the constant liquid level reference device through a connecting pipe;

[0013] The electric lifting platform drives the constant liquid level reference device to move in the vertical direction, and the automatic water replenishment pump drives the liquid in the water replenishment chamber to be injected into the reference chamber and ensures that the reference chamber is in a full water state. After the constant liquid level reference device completes the vertical displacement, the liquid level of the static level device always remains at the constant liquid level when the reference chamber is in a full water state.

[0014] Furthermore, the reference cavity is arranged at the center of the water replenishment cavity to form a double cavity structure, and the central axis of the reference cavity coincides with the central axis of the water replenishment cavity, and the central axis of the electric lifting platform coincides with the central axis of the reference cavity.

[0015] Furthermore, the mounting bracket includes a vertical beam extending in the vertical direction and a horizontal beam connected to the top of the vertical beam and extending in the horizontal direction. The mounting bracket is placed on the calibration platform in an inverted L shape, and its vertical beam is arranged parallel to the electric lifting platform in the vertical direction, and its horizontal beam is located above the pallet and arranged parallel to the pallet in the horizontal direction. The probe of the micrometer installed on the horizontal beam detects the displacement distance of the pallet in the vertical direction and reads the displacement data through the micrometer.

[0016] Furthermore, the number of the static level devices to be calibrated is one or more, and the multiple static level devices to be calibrated are connected through a connecting pipe, and the liquid level of each static level device is always maintained at a constant liquid level.

[0017] Furthermore, the calibration system of the static level device further includes a vent pipe, and the gas areas above the liquid surface of multiple static level devices to be calibrated are connected through the vent pipe, and are connected to the gas area above the liquid surface of the water replenishment chamber of the constant liquid level reference device through the vent pipe.

[0018] Furthermore, the static leveling device is provided with a standard scale plate, and the scale plate is provided with standard scale lines, and the scale lines can indicate the height value of the liquid level in the static leveling device.

[0019] Furthermore, the liquid is water, distilled water or antifreeze, and a surfactant is added to the liquid.

[0020] Furthermore, the static leveling device is a contact type static leveling device or a non-contact type static leveling device.

[0021] The present invention also provides a calibration method for a static leveling device, comprising the following steps:

[0022] S10: Start the automatic water replenishment pump, the liquid in the water replenishment chamber is continuously injected into the reference chamber to make the reference chamber full of water, adjust the height of the calibration platform, according to the principle of communicating vessels, make the liquid level height in the static level device to be calibrated at the 0 scale line and at the same liquid level as the liquid level in the reference chamber full of water, adjust the dial gauge to the 0 scale, and turn off the automatic water replenishment pump;

[0023] S20: Start the electric lifting platform, move the constant liquid level reference device to a certain height in the vertical direction, start the automatic water replenishment pump, make the reference chamber full of water, and then close the automatic water replenishment pump, read the displacement distance of the constant liquid level reference device with a micrometer, and simultaneously obtain the liquid level value of the static level device when the constant liquid level reference device is at a certain height;

[0024] S30: repeating step S20 to obtain multiple sets of displacement distance values ​​of the constant liquid level reference device and their corresponding liquid level values ​​of the static level device;

[0025] S40: Fitting the displacement value of the constant liquid level reference device and the liquid level value of the static level device.

[0026] Further, in step S40, the linear expression of the curve formed by fitting is: y=ax+b

[0027] Wherein, a and b are fitting coefficients, x is the liquid level value of the static level device, and y is the displacement value of the constant liquid level reference device.

[0028] The present invention has the following beneficial effects: in the calibration system of the static level device of the present application, a constant liquid level reference device is formed by utilizing a reference chamber, a water replenishment chamber, an automatic water replenishment pump and a liquid pipe; after the electric lifting platform drives the constant liquid level reference device to vertically displace, the automatic water replenishment pump can control the liquid in the reference chamber to be full of water; based on the connecting pipe principle, it is ensured that the displacement distance of the constant liquid level reference device driven by the electric lifting platform is always equal to the displacement distance of the liquid surface of the static level device; therefore, the liquid level value measured by the static level device to be calibrated during the calibration can be directly fitted with the micrometer reading, and accurate fitting data can be obtained; the actual measurement accuracy of the calibrated static level device will be greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the structure of the calibration system of the existing static level device;

[0030] Figure 2 It is a schematic diagram of the structure of the calibration system of the static leveling device of the present invention;

[0031] Figure 3 It is a schematic diagram of the scale of the static leveling device of the present invention;

[0032] In the figure: 100, reference liquid storage tank; 101, displacement platform; 102, dial indicator; 103, water pipe; 200, static level; 1, constant liquid level reference device; 11, reference cavity; 12, water replenishment cavity; 13, automatic water replenishment pump; 14, liquid pipe; 2, tray; 3, electric lifting platform; 4, mounting bracket; 41, vertical beam; 42, horizontal beam; 5, micrometer; 51, probe; 6, static level device; 7, connecting pipe; 8, ventilation pipe; 9, calibration table. DETAILED DESCRIPTION

[0033] In order to achieve accurate calibration of the static level device, the following Figure 2 With attached Figure 3 Specific embodiments of the present invention will be described.

[0034] Please refer to the attached Figure 2 As shown, the present invention provides a calibration system for a static level device, including a constant liquid level reference device 1, a tray 2, an electric lifting platform 3, a mounting bracket 4, a micrometer 5, a static level device to be calibrated 6, a connecting pipe 7 and a vent pipe 8.

[0035] The constant liquid level reference device 1 includes a reference chamber 11, a water replenishment chamber 12, an automatic water replenishment pump 13 and a liquid pipe 14. The reference chamber 11 is arranged at the center of the water replenishment chamber 12 to form a double-chamber structure, and the central axis of the reference chamber 11 coincides with the central axis of the water replenishment chamber 12. The bottom area of ​​the reference chamber 11 is smaller than the bottom area of ​​the water replenishment chamber 12 and the height of the reference chamber 11 is lower than the height of the water replenishment chamber 12. The automatic water replenishment pump 13 is connected in series to the liquid pipe 14, and the two ends of the liquid pipe 14 are respectively connected to the interfaces opened at the bottom of the reference chamber 11 and the water replenishment chamber 12. The automatic water replenishment pump 13 squeezes the liquid pipe 14 to drive the liquid in the water replenishment chamber 12 to fill the reference chamber 11 until the liquid in the reference chamber 11 overflows from the top opening into the water replenishment chamber 12, thereby ensuring that the liquid in the reference chamber 11 is in a full water state.

[0036] The tray 2 is used to carry the constant liquid level reference device 1. The lower end of the tray 2 is connected to an electric lift 3, and the central axis of the electric lift 3 and the reference cavity 11 also coincide. The electric lift 3 can drive the constant liquid level reference device 1 on the tray 2 to produce vertical displacement in the vertical direction. In the actual calibration scenario, the electric lift 3 is placed on the standard calibration platform 9, and the calibration platform 9 can be leveled to ensure that the electric lift 3 does not tilt.

[0037] The mounting bracket 4 includes a vertical beam 41 extending in the vertical direction and a horizontal beam 42 connected to the top of the vertical beam 41 and extending in the horizontal direction. The mounting bracket 4 is placed on the calibration platform 9 in an inverted L shape, and the calibration platform 9 is leveled to ensure that the mounting bracket 4 does not tilt. The vertical beam 41 of the mounting bracket 4 is arranged parallel to the electric lifting platform 3 in the vertical direction, and the horizontal beam 42 of the mounting bracket 4 is located above the tray 2 and is arranged parallel to the tray 2 in the horizontal direction.

[0038] The micrometer 5 is mounted on the crossbeam 42 of the mounting bracket 4 , and the probe 51 on the micrometer 5 abuts against the pallet 2 to detect the displacement distance of the pallet 2 in the vertical direction, and the displacement data is read through the micrometer 5 .

[0039] The static level device 6 to be calibrated is placed on the calibration platform 9, and the calibration platform 9 is leveled to ensure that the static level device 6 does not tilt. One end of the connecting pipe 7 is connected to the connecting pipe interface of the static level device 6, and the other end is connected to the connecting pipe interface at the bottom of the reference chamber 11 of the constant liquid level reference device 1, so that the static level device 6 is connected to the liquid in the reference chamber 11. One end of the vent pipe 8 is connected to the gas area above the liquid surface of the static level device 6, and the other end is connected to the gas area above the liquid surface of the water replenishment chamber 12 of the constant liquid level reference device 1, so that the static level device 6 is connected to the gas in the reference chamber 11. Figure 1 shows that a plurality of static level devices 6 to be calibrated are connected through the connecting pipe 7 and connected to the reference chamber 11, and a plurality of static level devices 6 to be calibrated are connected through the vent pipe 8 and connected to the water replenishment chamber 12. In an actual calibration scenario, the number of the static leveling devices 6 to be calibrated can be set according to actual demand standards, and can be one or more.

[0040] The static level device 6 to be calibrated is provided with a standard scale plate, and the scale plate is provided with standard scale lines, and the scale lines can indicate the height value of the liquid level in the static level device 6. Figure 3 The ultrasonic static level device is used as an example, and the reading range of the scale plate on it is 0mm to 100mm.

[0041] The system works as follows: the electric lifting platform 3 drives the constant liquid level reference device 1 to move in the vertical direction, the automatic water replenishment pump 13 drives the liquid in the water replenishment chamber 12 to be injected into the reference chamber 11 and ensures that the reference chamber 11 is full of water. After the constant liquid level reference device 1 completes the vertical displacement, based on the connecting pipe principle, the liquid level of the static level device 6 is always maintained at the constant liquid level of the full water state of the reference chamber 11. The displacement distance of the constant liquid level reference device 1 can be read by the micrometer 5, and the liquid level value of the liquid in the static level device 6 can be read.

[0042] The liquid in the present application may be water, distilled water or antifreeze, and a surfactant is added to the liquid to reduce the surface tension of the liquid.

[0043] The static leveling device 6 of the present application is a contact static leveling device or a non-contact static leveling device. The contact static leveling device includes a capacitive static leveling device, an inductive static leveling device and a CCD static leveling device. The non-contact static leveling device includes an ultrasonic static leveling device. Various static leveling devices are all prior art.

[0044] In order to strictly calibrate the relationship between the measured value of the static level device and the displacement value read by the micrometer, the accurate measurement of the liquid level change is achieved, and the measurement accuracy of the static level device 6 is improved. The present invention also provides a calibration method for the static level device 6, comprising the following steps:

[0045] S10: Start the automatic water replenishment pump 13, the liquid in the water replenishment chamber 12 is continuously injected into the reference chamber 11 and the reference chamber 11 is in a full water state, adjust the height of the calibration platform 9, according to the communicating vessel principle, make the liquid level height in the static level device 6 to be calibrated at the 0 scale line and at the same liquid level as the liquid level in the reference chamber 11 in a full water state, adjust the micrometer 5 to the 0 scale, and turn off the automatic water replenishment pump 13;

[0046] S20: Start the electric lifting platform 3, move the constant liquid level reference device 1 to a certain height in the vertical direction, start the automatic water replenishment pump 13, make the reference chamber 11 full of water, and then turn off the automatic water replenishment pump, read the displacement distance of the constant liquid level reference device 1 by the micrometer 5, and obtain the liquid level value of the static level device 6 when the constant liquid level reference device 1 is at a certain height;

[0047] S30: repeat step S20 to obtain multiple sets of displacement distance values ​​of the constant liquid level reference device 1 and the corresponding liquid level values ​​of the static level device 6;

[0048] S40: Fit the displacement value of the constant liquid level reference device 1 and the liquid level value of the static level device 6, and the linear expression of the fitted curve is: y=ax+b; wherein a and b are fitting coefficients, x is the liquid level value of the static level device, and y is the displacement value of the constant liquid level reference device.

[0049] Based on the above method, this embodiment calibrates a static leveling device 6, and the linear expression of the fitted curve is: y = 1.01289x-0.51479, and the goodness of fit R 2 =0.99998, the relevant data obtained are as follows:

[0050]

[0051] It can be seen from the above data that before calibration, the maximum difference between the liquid level value of the static level device and the displacement value read by the micrometer (i.e., the displacement value of the constant liquid level reference device) reached 0.889mm. After fitting calibration, the maximum difference between the liquid level value of the static level device and the displacement value read by the micrometer is only 0.140mm. The accuracy of the actual measured data measured by the static level device 6 after fitting is greatly improved.

[0052] The calibration system of the present invention is mainly composed of a constant liquid level reference device 1, a tray 2, an electric lifting platform 3, a mounting bracket 4, a micrometer 5, a static level device to be calibrated 6, a connecting pipe 7 and a vent pipe 8. The constant liquid level reference device 1 adopts a double liquid chamber design, which is divided into a reference chamber 11 and a water replenishment chamber 12, and has a built-in automatic water replenishment pump 13.

[0053] When the electric lifting platform 3 moves upward, the liquid in the reference chamber 11 of the constant liquid level reference device 1 will flow into the static level device 6 to be calibrated. At this time, the automatic water replenishment pump 13 will extract the liquid in the water replenishment chamber 12 and continuously inject it into the reference chamber 11 until the liquid in the reference chamber 11 overflows (the overflowed liquid automatically flows into the water replenishment chamber 12), thereby ensuring that the upward displacement of the electric lifting platform 3 is equal to the displacement of the rising liquid level of the static level device 6. When the electric lifting platform 3 moves downward, the liquid in the static level device 6 to be calibrated will flow back to the reference chamber 11, and the liquid in the reference chamber 11 will overflow into the water replenishment chamber 12, similarly ensuring that the downward displacement of the electric lifting platform 3 is equal to the displacement of the falling liquid level of the static level device 6. The displacement of the electric lifting platform 3 (that is, the displacement of the constant liquid level reference device 1) can be obtained through the micrometer 5, and the displacement data is equal to the theoretically accurate measured data of the standard static level device 6. Therefore, the liquid level value obtained in the calibration state of the static level device 6 to be calibrated is directly fitted with the reading of the micrometer 5 to obtain accurate fitting data. The accuracy of the measured data measured by the static level device 6 after fitting in the actual measurement environment will be greatly improved.

[0054] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be appreciated that the above description should not be considered as a limitation of the present invention. After reading the above content, it will be apparent to those skilled in the art that various modifications and substitutions of the present invention will occur. Therefore, the protection scope of the present invention should be limited by the appended claims.

Claims

1. A calibration system for a static leveling device, characterized in that: The calibration system of the static level device comprises a constant liquid level reference device (1), a tray (2), an electric lifting platform (3), a mounting bracket (4), a dial gauge (5), a static level device to be calibrated (6) and a connecting pipe (7); The constant liquid level reference device (1) comprises a reference chamber (11), a water replenishment chamber (12), an automatic water replenishment pump (13) and a liquid pipe (14); the reference chamber (11) is arranged in the water replenishment chamber (12); the automatic water replenishment pump (13) is connected in series to the liquid pipe (14); and both ends of the liquid pipe (14) are connected to the reference chamber (11) and the water replenishment chamber (12) respectively; The lower end of the tray (2) is connected to an electric lifting platform (3) placed on a calibration platform (9), and the constant liquid level reference device (1) is placed on the tray (2); The micrometer (5) is mounted on a mounting bracket (4) placed on a calibration platform (9), and a probe (51) on the micrometer (5) contacts the tray (2); The static level device (6) is placed on a calibration platform (9) and is connected to the reference chamber (11) of the constant liquid level reference device (1) through a connecting pipe (7); The electric lifting platform (3) drives the constant liquid level reference device (1) to move in the vertical direction, and the automatic water replenishment pump (13) drives the liquid in the water replenishment chamber (12) to be injected into the reference chamber (11) and ensures that the reference chamber (11) is in a full water state. After the constant liquid level reference device (1) completes the vertical displacement, the liquid level of the static level device (6) is always maintained at the constant liquid level of the full water state of the reference chamber (11); The number of the static level devices (6) to be calibrated is one or more, the multiple static level devices (6) to be calibrated are connected via a connecting pipe (7), and the liquid level of each static level device (6) is always maintained at a constant liquid level; The calibration system of the static level device further comprises a vent pipe (8), and the gas areas above the liquid surface of a plurality of static level devices (6) to be calibrated are connected via the vent pipe (8), and are also connected to the gas area above the liquid surface of the water replenishment chamber (12) of the constant liquid level reference device (1) via the vent pipe (8).

2. A calibration system for a static leveling device as claimed in claim 1, characterized in that: The reference cavity (11) is arranged at the center of the water replenishment cavity (12) to form a double cavity structure, and the central axis of the reference cavity (11) coincides with the central axis of the water replenishment cavity (12), and the central axis of the electric lifting platform (3) coincides with the central axis of the reference cavity (11).

3. The calibration system of a static leveling device according to claim 1, characterized in that: The mounting bracket (4) comprises a vertical beam (41) extending in the vertical direction and a horizontal beam (42) connected to the top of the vertical beam (41) and extending in the horizontal direction. The mounting bracket (4) is placed on the calibration platform (9) in an inverted L shape, wherein the vertical beam (41) is arranged parallel to the electric lifting platform (3) in the vertical direction, and the horizontal beam (42) is located above the pallet (2) and arranged parallel to the pallet (2) in the horizontal direction. The probe (51) of the micrometer (5) installed on the horizontal beam (42) detects the displacement distance of the pallet (2) in the vertical direction and reads the displacement data through the micrometer (5).

4. The calibration system of a static leveling device according to claim 1, characterized in that: The static leveling device (6) is provided with a standard scale plate, and the scale plate is provided with standard scale lines, and the scale lines can indicate the height value of the liquid level in the static leveling device (6).

5. The calibration system of a static leveling device according to claim 1, characterized in that: The liquid is water or antifreeze liquid, and a surfactant is added into the liquid.

6. A calibration system for a static leveling device as claimed in claim 5, characterized in that: The water is distilled water.

7. The calibration system of a static leveling device according to claim 1, characterized in that: The static leveling device (6) is a contact type static leveling device or a non-contact type static leveling device.

8. A method for calibrating a static level device, using the calibration system for a static level device according to any one of claims 1 to 7, characterized in that: The following steps are involved: S10: starting the automatic water replenishment pump (13), the liquid in the water replenishment chamber (12) is continuously injected into the reference chamber (11) so that the reference chamber (11) is in a full water state, adjusting the height of the calibration platform (9), according to the communicating vessel principle, so that the liquid level height in the static level device (6) to be calibrated is at the 0 scale line and is at the same liquid level as the liquid level in the reference chamber (11) in a full water state, adjusting the dial gauge (5) to the 0 scale, and closing the automatic water replenishment pump (13); S20: starting the electric lifting platform (3), moving the constant liquid level reference device (1) to a certain height in the vertical direction, starting the automatic water replenishment pump (13), closing the automatic water replenishment pump (13) after the reference chamber (11) is filled with water, using the micrometer (5) to read the displacement distance of the constant liquid level reference device (1), and simultaneously obtaining the liquid level value of the static level device (6) when the constant liquid level reference device (1) is at a certain height; S30: repeating step S20 to obtain multiple sets of displacement distance values ​​of the constant liquid level reference device (1) and the corresponding liquid level values ​​of the static level device (6); S40: Fitting the displacement value of the constant liquid level reference device (1) and the liquid level value of the static level device (6).

9. A method for calibrating a static leveling device as claimed in claim 8, characterized in that: In step S40, the linear expression of the curve formed by fitting is: y=ax+b Wherein, a and b are fitting coefficients, x is the liquid level value of the static level device, and y is the displacement value of the constant liquid level reference device.

Images