Production calibration device and method for ultrasonic water level gauge

Abstract

The invention provides a production calibration device and method for an ultrasonic water level gauge, and relates to the field of ultrasonic measurement. A production calibration device for an ultrasonic water level gauge comprises an operation table and the ultrasonic water level gauge, a back plate is fixedly installed on the operation table, a calibration device is arranged on the back plate, a power control device is arranged below the operation table, the calibration device comprises two pairs of fixing blocks, the fixing blocks are fixedly installed on the back plate, and a sliding rod is fixedly installed between the two fixing blocks. The same sliding table is installed on the sliding rods in a sliding mode, a pair of reflecting plates is installed on the operating table, and a first limiting block and a second limiting block are fixedly installed on the sliding rods respectively; the maximum stroke of the sliding table is limited through the first limiting block and the second limiting block, after the system is built, testing can be carried out only by pushing the sliding table to the maximum position through the air cylinder and the piston rod, and the device basically has no requirement for system control precision in the aspect of composition; in the calibration process, a high-precision distance measuring instrument is not needed as a reference.

Description

Technical Field

[0001] The present invention relates to the field of ultrasonic measurement, and particularly to a production calibration device and method for an ultrasonic water level gauge. Background Art

[0002] The ultrasonic ranging technology is a non-contact method for measuring distance. It uses the time interval for ultrasonic waves to propagate in a medium and reflect back from a target to determine the position of the target.

[0003] Due to the influence of filter delay, transducer parameter differences, structure, etc., the ultrasonic water level gauge has a fixed error, which seriously affects the measurement accuracy of the ultrasonic water level gauge. Therefore, it is necessary to correct the error of the ultrasonic water level gauge during the production of the ultrasonic device.

[0004] Most of the existing methods for calibrating ultrasonic water level gauge devices use a stepper motor and a higher-precision ranging instrument to provide reference parameters. In the calibration process of conventional 10m and 20m ultrasonic measurement devices, due to the large distance, the requirement for the length of the lead screw is high, and the time spent by the motor to switch different distances during the calibration process is long, resulting in low efficiency. Since it is necessary to use the controlled distance or the actual distance as the calibration comparison parameter, a high-precision control unit or ranging unit is required to achieve the calibration of the ranging accuracy of the ultrasonic ranging device, and the implementation difficulty and relative cost requirements are high. Therefore, a simpler and more convenient production calibration device is needed to achieve rapid calibration, improve production efficiency, and reduce the implementation cost of the device. Summary of the Invention

[0005] (1) Technical Problems to be Solved

[0006] In view of the deficiencies of the prior art, the present invention provides a production calibration device and method for an ultrasonic water level gauge, which solves the problems of high implementation difficulty and relatively high cost requirements in the calibration process of existing ultrasonic water level gauge calibration schemes for conventional 10m and 20m ultrasonic measurement devices.

[0007] (2) Technical Solutions

[0008] To achieve the above object, the present invention is realized through the following technical solutions: A production calibration device for an ultrasonic water level gauge includes an operation table and an ultrasonic liquid level gauge. A back plate is fixedly installed on the operation table, a calibration device is provided on the back plate, and a power control device is provided below the operation table;

[0009] Preferably, the calibration device includes two pairs of fixing blocks. The fixing blocks are fixedly installed on the back plate. A sliding rod is fixedly installed between the two fixing blocks. The same sliding table is slidably installed on the sliding rod. A pair of reflecting plates are installed on the operation table. A first limit block and a second limit block are respectively fixedly installed on the sliding rod.

[0010] Preferably, a plurality of clamping fixtures are fixedly installed on the sliding table, and the ultrasonic level gauge is clamped in the clamping fixture.

[0011] Preferably, a bracket is installed on the operating table, and the reflector is installed on the bracket.

[0012] Preferably, the reflecting surface of the reflector is parallel to the axis of the sliding rod, and when the ultrasonic level gauge is installed on the clamping fixture, the transmitting end of the ultrasonic level gauge is parallel to the reflecting surface of the bracket.

[0013] Preferably, the first limiting block and the second limiting block are respectively arranged at both ends of the sliding rod, and the reflector is installed between the first limiting block and the second limiting block.

[0014] Preferably, the power control device includes a power control box and an air compressor. The power control box and the air compressor are both installed below the operating table, and a solenoid valve and an MCU control unit are fixedly installed in the power control box.

[0015] Preferably, a cylinder is fixedly installed on the back plate, a piston rod is installed in the cylinder, and the output end of the piston rod is fixedly connected to one side surface of the sliding table.

[0016] Preferably, a display and control screen is fixedly installed on the back plate. The display and control screen is electrically connected to the MCU control unit, and the MCU control unit is electrically connected to the solenoid valve.

[0017] Preferably, the air outlet of the air compressor is connected to the air inlet of the air compressor through a pneumatic pipeline. The two air outlets of the air compressor are respectively connected to the air inlet and the air outlet of the cylinder through pneumatic pipelines.

[0018] Preferably, a production calibration device and method for an ultrasonic water level gauge are as follows:

[0019] S1. Fix and install the ultrasonic level gauge on the sliding table through the clamping fixture;

[0020] S2. Build the system, install and adjust the two brackets and the reflector. Place the two reflectors parallel and staggered on the operating table, and ensure that when the sliding table moves to the farthest distance limited by the first limiting block and the second limiting block, the transmitting surface of the ultrasonic level gauge can only directly irradiate one of the reflectors. The distance between the reflecting surface of the reflector and the transmitting surface of the ultrasonic level gauge is used as the standard reference distance during calibration;

[0021] S3. Start calibration. On the display and control screen, click to start calibration. The display and control screen communicates with the MCU control unit. Let the MCU control unit start to execute the automatic calibration process;

[0022] S4. The MCU control unit controls the solenoid valve through the relay to retract the piston rod on the cylinder, and the piston rod drives the slide table to move to the position of the first limit block;

[0023] S5. First distance measurement: The MCU control unit sends measurement commands according to the different communication addresses of different ultrasonic level gauges respectively, enabling the ultrasonic level gauges to perform distance measurement, and storing the measurement results D1 and flight time T1 of each ultrasonic level gauge;

[0024] S6. The MCU control unit controls the solenoid valve through the relay to extend the piston rod on the cylinder, and the piston rod drives the slide table to move to the position of the second limit block;

[0025] S7. Second distance measurement: The MCU control unit sends measurement commands according to the different communication addresses of different ultrasonic level gauges respectively, enabling the ultrasonic level gauges to perform distance measurement, and storing the measurement results D2 and flight time T2 of each ultrasonic level gauge;

[0026] S8. Calculate the calibration coefficient: The MCU control unit substitutes the two measured distance results D and flight time T into the formula to calculate k and b respectively;

[0027] S9. Issue the calibration coefficient: The MCU control unit sends the corresponding calibration coefficients to each ultrasonic level gauge respectively, and the calibration is completed.

[0028] (III) Beneficial effects

[0029] The present invention provides a production calibration device and method for an ultrasonic water level gauge. It has the following beneficial effects:

[0030] 1. In the present invention, by using the first limit block and the second limit block to limit the maximum stroke of the slide table, after the system is built, only by using the cylinder and the piston rod to push the slide table to move to the maximum position can the test be carried out. There is basically no requirement for the system control accuracy in the device composition, and there is no need for a high-precision ranging instrument as a reference during the calibration process.

[0031] 2. Since the present invention makes a lateral displacement to switch the standard test distance points, in the calibration of medium and long-distance ultrasonic ranging, by using reflectors with multiple fixed preset distances to reflect ultrasonic signals, the positioning control accuracy requirements for the calibration device are greatly reduced, resulting in a reduction in production costs.

[0032] 3. The interactive platform of the present invention adopts an industrial touch control screen, making the human-machine interaction more convenient and enabling the automatic calibration process of the ultrasonic level gauge.

[0033] 4. Through the vertically arranged slide table, multiple ultrasonic level gauges can be fixed by using the clamping fixtures on the slide table, and multiple ultrasonic water level gauges can be calibrated simultaneously, improving the production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 Schematic diagram of the overall three-dimensional structure of the present invention;

[0035] Figure 2 Schematic diagram of the structures such as the display control screen and cylinder of the present invention;

[0036] Figure 3 Schematic diagram of the structures such as the air compressor and power control box of the present invention;

[0037] Figure 4 is Figure 3 Schematic diagram of the enlarged structure of part A of;

[0038] Figure 5 Schematic diagram of the structures such as the sliding table and clamping fixture of the present invention;

[0039] Figure 6 Top view schematic diagram of the structures such as the operating table and reflector of the present invention;

[0040] Figure 7 Schematic diagram of the connection structure between components such as the MCU control unit and air compressor of the present invention and other structures.

[0041] Among them, 1. Operating table; 2. Calibration device; 3. Power control device; 4. Back plate; 5. Ultrasonic level gauge; 20. Fixed block; 21. Slide bar; 22. Sliding table; 23. Clamping fixture; 24. Bracket; 25. Reflector; 26. First limit block; 27. Second limit block; 30. Power control box; 31. Solenoid valve; 32. Display control screen; 33. Air compressor; 34. Cylinder; 35. Piston rod; 36. MCU control unit. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0042] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0043] Embodiment 1:

[0044] As Figures 1-7As shown in the figure, an embodiment of the present invention provides a production calibration device for an ultrasonic water level gauge, including an operating table 1 and an ultrasonic liquid level gauge 5. In order to design a liquid level gauge calibration device with low requirements for device accuracy, a backboard 4 is fixedly installed on the operating table 1, a calibration device 2 is provided on the backboard 4, and a power control device 3 is provided below the operating table 1. The ultrasonic liquid level gauge 5 is calibrated by the calibration device 2, and the power control device 3 provides power and signal control for the calibration device 2;

[0045] To achieve the calibration function, the calibration device 2 includes two pairs of fixing blocks 20. The fixing blocks 20 are fixedly installed on the backboard 4. A slide bar 21 is fixedly installed between the two fixing blocks 20. The same slide table 22 is slidably installed on the slide bar 21. A pair of reflecting plates 25 are installed on the operating table 1. A first limit block 26 and a second limit block 27 are respectively fixedly installed on the slide bar 21. A plurality of clamping and fixing devices 23 are fixedly installed on the slide table 22. The ultrasonic liquid level gauge 5 is clamped in the clamping and fixing devices 23. A support 24 is installed on the operating table 1, and the reflecting plate 25 is installed on the support 24. The reflecting surface of the reflecting plate 25 is parallel to the axis of the slide bar 21. When the ultrasonic liquid level gauge 5 is installed on the clamping and fixing devices 23, the emitting end of the ultrasonic liquid level gauge 5 is parallel to the reflecting surface of the support 24. The first limit block 26 and the second limit block 27 are respectively arranged at both ends of the slide bar 21, and the reflecting plate 25 is installed between the first limit block 26 and the second limit block 27;

[0046] A production calibration device and method for an ultrasonic water level gauge are as follows:

[0047] S1. Fix the ultrasonic liquid level gauge 5 on the slide table 22 through the clamping and fixing devices 23;

[0048] S2. Build the system, install and adjust the two supports 24 and the reflecting plates 25. Place the two reflecting plates 25 parallel and staggered on the operating table 1, and ensure that when the slide table 22 moves to the farthest distance limited by the first limit block 26 and the second limit block 27, the emitting surface of the ultrasonic liquid level gauge 5 can only directly irradiate one of the reflecting plates 25. The distances between the reflecting surfaces of the reflecting plates 25 and the emitting surface of the ultrasonic liquid level gauge 5 are used as the standard reference distances L1 and L2 during calibration;

[0049] S3. Start calibration. On the display and control screen 32, click to start calibration. The display and control screen 32 communicates with the MCU control unit 36. Let the MCU control unit 36 start to execute the automatic calibration process;

[0050] S4. 36 controls the solenoid valve 31 through the control relay to retract the piston rod 35 on the cylinder 34. The piston rod 35 drives the slide table 22 to move to the position of the first limit block 26;

[0051] S5, First distance measurement: The MCU control unit 36 sends measurement instructions according to the different communication addresses of different ultrasonic level gauges 5, causing the ultrasonic level gauges 5 to perform distance measurements, and storing the measurement results D1 and flight time T1 of each ultrasonic level gauge 5;

[0052] S6, 36 controls the solenoid valve 31 through the control relay to make the piston rod 35 on the cylinder 34 extend, and the piston rod 35 drives the slide 22 to move to the position of the second limit block 27;

[0053] S7, Second distance measurement: The MCU control unit 36 sends measurement instructions according to the different communication addresses of different ultrasonic level gauges 5, causing 5 to perform distance measurements, and storing the measurement results D2 and flight time T2 of each ultrasonic level gauge 5;

[0054] S8, Calculate the calibration coefficient: The MCU control unit 36 substitutes the two measured distance results D and flight time T into the formula to calculate k and b respectively;

[0055] S9, Send the calibration coefficient: The MCU control unit 36 sends the corresponding calibration coefficients to each ultrasonic level gauge 5, and the calibration is completed.

[0056] The calibration calculation formula mentioned in the previous text is as follows:

[0057] L = D + kT + b

[0058] L: Actual standard distance

[0059] D: Measured distance

[0060] T: Flight time of ultrasonic wave in air

[0061] The distance D calculation formula of the ultrasonic water level gauge is as follows:

[0062] D = 1 / 2 * Vtemp * T

[0063] D: Distance between the measured object and the ultrasonic level gauge

[0064] Vtemp: Propagation speed of ultrasonic wave in air at temperature t

[0065] T: Total time of ultrasonic wave traveling back and forth in air

[0066] During use, connect the air outlet of the air compressor 33 to the air inlet of the solenoid valve 31. Connect the two air outlets of the solenoid valve 31 to the air inlet and air outlet of the cylinder 34 respectively through the starting pipeline. When the valve works, the cylinder 34 is in two states of extension and retraction respectively. By opening and closing the solenoid valve 31, the calibration position of the ultrasonic level gauge 5 is changed. During operation, fix and install the ultrasonic level gauge 5 on the sliding table 22 through the clamping fixture 23. Prepare to build the system, install and adjust the two brackets 24 and the reflector 25. Place the two reflectors 25 parallel and staggered on the operating table 1, and ensure that when the sliding table 22 moves to the farthest distance limited by the first limit block 26 and the second limit block 27, the emitting surface of the ultrasonic level gauge 5 can only directly irradiate one of the reflectors 25. The distance between the reflecting surface of the reflector 25 and the emitting surface of the ultrasonic level gauge 5 is used as the standard reference distance during calibration. During calibration, the sliding table 22 moves to the position of the first limit block 26, so that the ultrasonic level gauge 5 measures the distance, and stores the measurement result D1 and the flight time T1 of each ultrasonic level gauge 5. Then move the sliding table 22 to the position of the second limit block 27, so that the ultrasonic level gauge 5 measures the distance, and stores the measurement result D2 and the flight time T2 of each ultrasonic level gauge 5. Through the two measured distance results D and flight times T, substitute them into the formula to calculate k and b respectively, and send the corresponding calibration coefficients to each ultrasonic level gauge 5 respectively, that is, the calibration is completed.

[0067] Among them, the slide bar module is composed of 2 slide bars 21 with a 3m stroke, a clamping fixture 23, and two limit blocks. This module is used to clamp the ultrasonic level gauge 5 during the calibration process. The slide bar 21 needs to be parallel to the reflector 25. Assist the ultrasonic level gauge 5 to change at different calibration positions. The limit block is used to control the moving position of the ultrasonic level gauge 5. The reflector 25 is composed of a flat plate with a smooth surface of 2m * 2m and a fixed bracket. It needs to be accurately fixed during the system construction and used as the standard reference distance during calibration. Secondly, the reflection baffle needs to ensure that the slide bar is parallel to the emitting surface of the ultrasonic water level gauge to ensure the stability of the measurement result.

[0068] Embodiment 2:

[0069] As Figures 1-4 shown, the embodiment of the present invention provides a production calibration device for an ultrasonic water level gauge, which is further expanded according to the content in the specific Embodiment 1:

[0070] Among them, in order to provide power for the calibration device 2 and control it, the power control device 3 includes a power control box 30 and an air compressor 33. Both the power control box 30 and the air compressor 33 are installed under the operating table 1. An electromagnetic valve 31 and an MCU control unit 36 are fixedly installed in the power control box 30. A cylinder 34 is fixedly installed on the backplane 4. A piston rod 35 is installed in the cylinder 34. The output end of the piston rod 35 is fixedly connected to one side of the sliding table 22. A display control screen 32 is fixedly installed on the backplane 4. The display control screen 32 is electrically connected to the MCU control unit 36. The MCU control unit 36 is electrically connected to the electromagnetic valve 31. The air outlet of the air compressor 33 is connected to the air inlet of the air compressor 33 through a pneumatic pipeline. Two air outlets of the air compressor 33 are respectively connected to the air inlet and the air outlet of the cylinder 34 through pneumatic pipelines. During use, the air outlet of the air compressor 33 is connected to the air inlet of the electromagnetic valve 31. Two air outlets of the electromagnetic valve 31 are respectively connected to the air inlet and the air outlet of the cylinder 34 through starting pipelines. When the valve works, the cylinder 34 is respectively in two states of extending and retracting. By opening and closing the electromagnetic valve 31, the calibration position of the ultrasonic level gauge 5 is changed. During calibration, on the display control screen 32, click to start calibration. The display control screen 32 communicates with the MCU control unit 36. Let the MCU control unit 36 start to execute the automatic calibration process. The MCU control unit 36 controls the electromagnetic valve 31 through a relay to retract the piston rod 35 on the cylinder 34. The piston rod 35 drives the sliding table 22 to move. The MCU control unit 36 respectively sends measurement instructions according to the different communication addresses of different ultrasonic level gauges 5, so that the ultrasonic level gauges 5 perform distance measurement.

[0071] Among them, the model of the display control screen 32 is SA-070F, which is a 7-inch industrial touch control screen with a 485 communication interface; it has good stability and a human-machine interaction interface, which is convenient for the operation and display of the production process. During the production calibration process, this screen mainly realizes the issuance of the calibration behavior of the calibration device, and the display of the measurement parameters of each distance point and the distance calibration parameters during the automatic calibration process. It is used to control the operation of the system and check whether the operation of the calibration process is normal.

[0072] The MCU control unit 36 is composed of an STM32U575RGT6 chip and is a control unit module with multiple 485 communication interfaces and relay control interfaces. During the calibration process, the MCU control unit controls the solenoid valve group through the relay assembly to make the cylinder reach the limit 1 position, communicates with the ultrasonic level gauge 5, enables it to measure the first standard distance point L1 and obtain the data D1, and then controls the cylinder 34 to reach the limit two position again to measure the second standard distance point L2 again and obtain the measurement data D2. According to the comparison calculation between the preset actual standard distance and the measured distance, the MCU can obtain the measurement compensation coefficients of all current ultrasonic level gauges 5 and send all calibration coefficients to each ultrasonic level gauge 5 respectively, thus completing the calibration of the ultrasonic level gauge 5.

[0073] The air compressor 33 selects an Aotusi 1100W 100L / min air compressor with adjustable pressure from 0.4mpa to 0.8mpa, which is used to provide power for the cylinder.

[0074] The solenoid valve 31 valve group model is: AirTAC 4V210-08B DC24V. This valve group is a 5-port 2-position solenoid valve group. Connect its P port to the compressed air, and the A port and B port lead to the air inlet and outlet of the cylinder 34 respectively. A and B always have one inlet and one outlet to supply air to the cylinder 34, enabling the cylinder 34 to be in two states of extension and retraction respectively. By controlling the opening and closing of the solenoid valve 31, the change of the calibration position of the ultrasonic level gauge is realized.

[0075] Working principle: When in use, connect the air outlet of the air compressor 33 to the air inlet of the solenoid valve 31. Connect the two air outlets of the solenoid valve 31 to the air inlet and air outlet of the cylinder 34 through the starting pipeline respectively. When the valve works, the cylinder 34 is in two states of extension and retraction respectively. By opening and closing the solenoid valve 31, the calibration position of the ultrasonic level gauge 5 is changed. When working, fix and install the ultrasonic level gauge 5 on the sliding table 22 through the clamping holder 23, and prepare to build the system. Install and adjust the two brackets 24 and the reflector 25. Place the two reflectors 25 parallel and staggered on the operating table 1, and ensure that when the sliding table 22 moves to the farthest distance limited by the first limit block 26 and the second limit block 27, the emitting surface of the ultrasonic level gauge 5 can only directly irradiate one of the reflectors 25. The distance between the reflecting surface of the reflector 25 and the emitting surface of the ultrasonic level gauge 5 is used as the standard reference distance during calibration. During calibration, click "Calibration Start" on the display and control panel 32. The display and control panel 32 communicates with the MCU control unit 36. Let the MCU control unit 36 start to execute the automatic calibration process. The MCU control unit 36 controls the solenoid valve 31 through the control relay to retract the piston rod 35 on the cylinder 34. The piston rod 35 drives the sliding table 22 to move to the position of the first limit block 26. The MCU control unit 36 sends measurement commands respectively according to the different communication addresses of different ultrasonic level gauges 5, so that the ultrasonic level gauges 5 perform distance measurement, and store the measurement results D1 and flight time T1 of each ultrasonic level gauge 5. The MCU control unit 36 controls the solenoid valve 31 through the control relay to extend the piston rod 35 on the cylinder 34. The piston rod 35 drives the sliding table 22 to move to the position of the second limit block 27. The MCU control unit 36 sends measurement commands respectively according to the different communication addresses of different ultrasonic level gauges 5, so that the ultrasonic level gauges 5 perform distance measurement, and store the measurement results D2 and flight time T2 of each ultrasonic level gauge 5. The MCU control unit 36 substitutes the two measured distance results D and flight time T into the formula to calculate k and b respectively. The MCU control unit 36 sends the corresponding calibration coefficients to each ultrasonic level gauge 5 respectively, and the calibration is completed. If the calibration conditions and the parameters of the ultrasonic level gauge 5 remain unchanged, when calibrating the next batch of ultrasonic level gauges 5 to be measured, only need to replace the ultrasonic level gauge 5, there is no need to change the position of the reflector 25. The system only needs to be built once and can be used quickly and conveniently, so that the speed of calibrating the ultrasonic level gauge 5 in production can be greatly improved.

[0076] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A production calibration device for an ultrasonic water level gauge, comprising an operating table (1) and an ultrasonic level gauge (5), characterized in that: A backboard (4) is fixedly installed on the operation table (1), a calibration device (2) is provided on the backboard (4), and a power control device (3) is provided below the operation table (1). The calibration device (2) includes two pairs of fixing blocks (20). The fixing blocks (20) are fixedly installed on the backboard (4). A slide bar (21) is fixedly installed between the two fixing blocks (20). The same slide table (22) is slidably installed on the slide bar (21). A pair of reflecting plates (25) are installed on the operation table (1). A first limit block (26) and a second limit block (27) are respectively fixedly installed on the slide bar (21).

2. The production calibration device of an ultrasonic water level gauge according to claim 1, characterized in that: A number of clamping fixtures (23) are fixedly installed on the slide table (22), and the ultrasonic level gauge (5) is clamped in the clamping fixtures (23).

3. The production calibration device of an ultrasonic water level gauge according to claim 2, characterized in that: A bracket (24) is installed on the operation table (1), and the reflecting plate (25) is installed on the bracket (24).

4. The production calibration device of an ultrasonic water level gauge according to claim 3, characterized in that: The reflecting surface of the reflecting plate (25) is parallel to the axis of the slide bar (21). When the ultrasonic level gauge (5) is installed on the clamping fixture (23), the emitting end of the ultrasonic level gauge (5) is parallel to the reflecting surface of the bracket (24).

5. The production calibration device of an ultrasonic water level gauge according to claim 4, characterized in that: The first limit block (26) and the second limit block (27) are respectively arranged at both ends of the slide bar (21), and the reflecting plate (25) is installed between the first limit block (26) and the second limit block (27).

6. The production calibration device of an ultrasonic water level gauge according to claim 1, characterized in that: The power control device (3) includes a power control box (30) and an air compressor (33). The power control box (30) and the air compressor (33) are both installed below the operation table (1). A solenoid valve (31) and an MCU control unit (36) are fixedly installed in the power control box (30).

7. The production calibration device of an ultrasonic water level gauge according to claim 6, characterized in that: A cylinder (34) is fixedly installed on the backboard (4). A piston rod (35) is installed in the cylinder (34), and the output end of the piston rod (35) is fixedly connected to one side surface of the slide table (22).

8. The production calibration device of an ultrasonic water level gauge according to claim 7, characterized in that: A display and control screen (32) is fixedly installed on the backboard (4). The display and control screen (32) is electrically connected to the MCU control unit (36), and the MCU control unit (36) is electrically connected to the solenoid valve (31).

9. The production calibration device of an ultrasonic water level gauge according to claim 8, characterized in that: The air outlet of the air compressor (33) is connected to the air inlet of the air compressor (33) through a pneumatic pipeline. The two air outlets of the air compressor (33) are respectively connected to the air inlet and the air outlet of the cylinder (34) through pneumatic pipelines.

10. A production calibration device and method for an ultrasonic water level gauge, characterized in that: The specific steps are as follows: S1. Fix and install the ultrasonic level gauge (5) on the slide table (22) through the clamping fixture (23). S2. Build the system, install and adjust the two brackets (24) and the reflecting plates (25). Place the two reflecting plates (25) parallel and staggered on the operation table (1), and ensure that when the slide table (22) moves to the farthest distance limited by the first limit block (26) and the second limit block (27), the emitting surface of the ultrasonic level gauge (5) can only directly irradiate one of the reflecting plates (25). The distance between the reflecting surface of the reflecting plate (25) and the emitting surface of the ultrasonic level gauge (5) is used as the standard reference distance during calibration. S3. Calibration starts. On the display and control screen (32), click the start of calibration. The display and control screen (32) communicates with the MCU control unit (36), and the MCU control unit (36) starts to execute the automatic calibration process; S4. The MCU control unit (36) controls the solenoid valve (31) through a relay to retract the piston rod (35) on the cylinder (34). The piston rod (35) drives the slide table (22) to move to the position of the first limit block (26); S5. First distance measurement: The MCU control unit (36) sends measurement instructions according to the different communication addresses of different ultrasonic level gauges (5) to make the ultrasonic level gauges (5) perform distance measurement, and stores the measurement results D1 and flight time T1 of each ultrasonic level gauge (5); S6. The MCU control unit (36) controls the solenoid valve (31) through a relay to extend the piston rod (35) on the cylinder (34). The piston rod (35) drives the slide table (22) to move to the position of the second limit block (27); S7. Second distance measurement: The MCU control unit (36) sends measurement instructions according to the different communication addresses of different ultrasonic level gauges (5) to make the ultrasonic level gauges (5) perform distance measurement, and stores the measurement results D2 and flight time T2 of each ultrasonic level gauge (5); S8. Calculate the calibration coefficient: The MCU control unit (36) substitutes the two measured distance results D and flight time T into the formula to calculate k and b respectively; S9. Issue the calibration coefficient: The MCU control unit (36) sends the corresponding calibration coefficients to each ultrasonic level gauge (5), and the calibration is completed.

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