A volumetric method-based volume tube automatic calibration device and calibration method

Abstract

The present application relates to the technical field of volumetric tube standard device verification, and particularly relates to a volumetric tube automatic calibration device and method based on volumetric method, comprising a volumetric tube calibration table, a liquid level collection mechanism, a commutator, a first standard tank, a second standard tank, a water pool, a circulating pump, a first pipeline and a second pipeline; one side of the first standard tank and the second standard tank is provided with a tubular liquid level meter, and the bottom of the tubular liquid level meter is fixedly connected with an electric lifting mechanism, and a camera and a photoelectric switch are fixedly arranged on the supporting end of the electric lifting mechanism. The present application uses the photoelectric switch to position the standard liquid level concave liquid surface of the tubular liquid level meter more accurately, so that the camera can accurately shoot the position of the liquid level concave liquid surface, and effectively reduces the reading error.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of volumetric tube standard device calibration, and particularly relates to a volumetric tube automatic calibration device and method based on volumetric method. BACKGROUND

[0002] The volumetric tube standard device is composed of a tube body, a standard volume section, a displacement ball, a detection switch, a valve and a sealing mechanism, and is mainly used for calibrating flowmeters and is an upper standard device of flowmeters. The calibration period of the volumetric tube is generally once every three years, and the main working principle is that when the displacement ball in the volumetric tube is pushed by liquid and triggers two detection switches in sequence at a certain speed, the liquid in the device is guided into the standard device, and the standard volume value of the volumetric tube is obtained by conversion of the indication value of the standard device.

[0003] The current volumetric tube calibration method is mainly the volumetric method, and the volumetric tube calibration process based on the volumetric method mainly relies on manual operation of the volumetric tube diverter to switch the tank.

[0004] The patent document (CN106441515A) discloses a main standard device volumetric calibration device and method based on the forward and reverse strokes of the diverter. The method is mainly used for detecting the piston volumetric tube, the photoelectric switch is located at the lower part of the piston rod, and the movement of the piston rod is detected to automatically control, but it cannot be applied to the on-site calibration of the bidirectional ball volumetric tube and the single-phase ball volumetric tube.

[0005] The main problem of the prior art is that in the volumetric tube calibration process, especially under the condition that the volumetric tube has a large volume, the standard tank needs to be switched and watered for measurement multiple times, the liquid level of the standard tank cannot be automatically determined, and when the volumetric method is used to calibrate the volumetric tube, the work efficiency is low, the labor intensity is large, and there are many human interference factors. SUMMARY

[0006] The present application is aimed at the defects of the prior art, and provides a volumetric tube automatic calibration device and method based on the volumetric method. The device can quickly detect and position the liquid level of the standard tank and read the liquid level value, and can automatically switch the diverter to water the standard tank by setting the liquid level count value.

[0007] The technical scheme of the present application is as follows:

[0008] A volumetric tube automatic calibration device based on the volumetric method, comprising a volumetric tube calibration table, a liquid level acquisition mechanism, a diverter, a first standard tank, a second standard tank, a water tank, a circulating pump, a first pipeline and a second pipeline.

[0009] The reversing device is provided with one inlet and two outlets, the two outlets of the reversing device are connected with the inlets of the first standard tank and the second standard tank respectively, and the bottoms of the first standard tank and the second standard tank are respectively provided with liquid discharge valves for discharging liquid into the water pool;

[0010] The inlet of the reversing device is connected with the outlet of the first pipeline, a liquid inlet valve is installed at the inlet of the reversing device, the inlet of the first pipeline is connected with the outlet of the measured volume tube, a branch line connected with the water pool is connected to the first pipeline through a tee joint, and a bypass valve is arranged on the branch line;

[0011] The circulating pump is connected to the second pipeline, the inlet of the second pipeline is connected with the water pool, and the outlet of the second pipeline is connected with the inlet of the measured volume tube;

[0012] The first standard tank and the second standard tank are respectively provided with a tubular liquid level gauge on one side, and the bottom of the tubular liquid level gauge is fixedly connected with an electric lifting mechanism, and a camera and a photoelectric switch are fixedly arranged on the supporting end of the electric lifting mechanism;

[0013] The reversing device, the circulating pump and the liquid level collecting mechanism are respectively electrically connected with the volume tube calibration platform, and the electric lifting mechanism, the camera and the photoelectric switch are respectively electrically connected with the liquid level collecting mechanism.

[0014] Preferably, the electric lifting mechanism comprises a stepping motor and a screw lifting platform, and the screw lifting platform is driven by the stepping motor.

[0015] Preferably, the liquid inlet valve and the bypass valve are both electric valves, and the liquid inlet valve and the bypass valve are respectively electrically connected with the volume tube calibration platform.

[0016] Preferably, the liquid discharge valve is an electric valve, and the liquid discharge valve is electrically connected with the volume tube calibration platform.

[0017] Preferably, the electric lifting mechanism, the camera and the photoelectric switch are all connected with the liquid level collecting mechanism through wireless connection.

[0018] Preferably, the inlet of the first pipeline and the outlet of the measured volume tube are connected with each other through a quick connector.

[0019] Preferably, the outlet of the second pipeline and the inlet of the measured volume tube are connected with each other through a quick connector.

[0020] A calibration method of a volume tube automatic calibration device based on the volume method, comprising the following steps:

[0021] (1) The liquid level values of the first standard tank and the second standard tank are set in the liquid level collecting mechanism, and the number of reversing times of the reversing device is set according to the standard value of the measured volume tube;

[0022] (2) the commutator is communicated with the second standard tank, then the circulating pump is started, and the displacement ball in the volume tube is moved in the volume tube;

[0023] (3) when the displacement ball passes through the detection switch A of the volume tube, the commutator is switched to communicate with the first standard tank, and the liquid discharge valve of the second standard tank is opened to be emptied, when the liquid level reaches the set value of the first standard tank, the commutator is switched to communicate with the second standard tank, then the electric lifting mechanism on the first standard tank is started, and drives the camera and the photoelectric switch to move upwards;

[0024] (4) after the wall-hung water flow in the first standard tank falls, the standard liquid level is formed, when the photoelectric switch rises to the concave liquid surface of the standard liquid level along with the electric lifting mechanism, the refraction angle of the photoelectric switch is offset, and a signal is sent to the liquid level collection mechanism, then the electric lifting mechanism on the first standard tank is stopped through the liquid level collection mechanism;

[0025] (6) the liquid level value on the first standard tank is photographed by the miniature camera, and the data is transmitted to the liquid level collection mechanism, the data is analyzed and recorded, then the liquid discharge valve of the first standard tank is opened to be emptied;

[0026] (7) when the commutator is switched to communicate with the second standard tank, the electric lifting mechanism on the second standard tank is used to drive the photoelectric switch and the camera to rise, when the photoelectric switch reaches the standard liquid level concave liquid surface of the second standard tank, the electric lifting mechanism is stopped, the liquid level value on the second standard tank is photographed by the miniature camera, and the data is analyzed and recorded through the collection mechanism, then the liquid discharge valve of the second standard tank is opened to be emptied;

[0027] (8) when the displacement ball in the volume tube reaches the detection switch B, the liquid inlet valve is closed, the bypass valve is opened, the metering is finished, and the scale on the last communicated standard tank is photographed by the camera, then the data is analyzed and recorded through the collection mechanism.

[0028] Compared with the prior art, the present application has the following advantages:

[0029] The liquid level collection mechanism is communicated with the volume tube calibration table to realize wireless automatic collection of the liquid level of the standard tank, and the labor intensity of personnel is reduced.

[0030] The liquid level collection mechanism controls the flow actions of the electric lifting mechanism, the camera and the photoelectric switch, the liquid level value of the standard tank can be judged and read, and the data can be transmitted to the liquid level collection mechanism and the volume tube calibration table;

[0031] The photoelectric switch is used for positioning the standard liquid level concave liquid surface, which is more accurate, so that the camera can accurately photograph the position of the liquid level concave liquid surface, and the error of reading data is effectively reduced.

[0032] The preset liquid level and the pouring times of the tank are set by the volume tube standard value, and the automatic reversing of the first standard tank and the second standard tank can be realized by the reversing device, so as to reduce the number of staff and labor intensity. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 The structure of the present application is shown in the figure;

[0034] Figure 2 The assembly of the electric lifting mechanism, the camera and the photoelectric switch is shown in the figure;

[0035] In the figure: 1, reversing device, 2, liquid inlet valve, 3, first pipeline, 4, branch, 5, bypass valve, 6, volume tube calibration platform, 7, liquid level acquisition mechanism, 8, tubular liquid level meter, 9, electric lifting mechanism, 10, first standard tank, 11, water tank, 12, second standard tank, 13, liquid outlet valve, 14, second pipeline, 15, circulating pump, 16, displacement ball, 17, detection switch A, 18, detection switch B, 19, volume tube, 20, camera, 21, photoelectric switch, 22, screw lifting platform, 23, stepping motor. DETAILED DESCRIPTION

[0036] The present application is further described below in combination with the drawings and examples.

[0037] Example 1

[0038] Reference Figure 1 and Figure 2 A volume tube automatic calibration device based on the volume method, comprising a volume tube calibration platform 6, a liquid level acquisition mechanism 7, a reversing device 1, a first standard tank 10, a second standard tank 12, a water tank 11, a circulating pump 15, a first pipeline 3 and a second pipeline 14.

[0039] The reversing device 1 is provided with one inlet and two outlets, and the two outlets of the reversing device 1 are connected with the inlets of the first standard tank 10 and the second standard tank 12 respectively.

[0040] The bottoms of the first standard tank 10 and the second standard tank 12 are respectively provided with liquid outlet valves 13 for discharging liquid into the water tank 11.

[0041] The inlet of the reversing device 1 is connected with the outlet of the first pipeline 3, and a liquid inlet valve 2 is installed at the inlet of the reversing device 1.

[0042] The inlet of the first pipeline 3 is connected with the outlet of the measured volume tube 19, and a branch 4 communicating with the water tank 11 is connected to the first pipeline 3 through a tee joint, and the branch 4 is provided with a bypass valve 5.

[0043] The circulating pump 15 is connected to the second pipeline 14, the inlet of the second pipeline 14 is connected with the water tank 11, and the outlet of the second pipeline 14 is connected with the inlet of the measured volume tube 19.

[0044] The first standard tank 10 and the second standard tank 12 are each provided with a tubular liquid level gauge 8, and the bottom of the tubular liquid level gauge 8 is fixedly connected with an electric lifting mechanism 9.

[0045] A camera 20 and a photoelectric switch 21 are fixedly arranged on the supporting end of the electric lifting mechanism 9.

[0046] The commutator 1, the circulating pump 15 and the liquid level collecting mechanism 7 are respectively electrically connected with the volumetric tube calibration platform 6.

[0047] The electric lifting mechanism 9, the camera 20 and the photoelectric switch 21 are respectively electrically connected with the liquid level collecting mechanism 7.

[0048] In addition, the liquid discharge valve 13, the liquid inlet valve 2 and the bypass valve 5 are all electric valves, and are respectively electrically connected with the volumetric tube calibration platform 6.

[0049] Example 2

[0050] Based on the calibration method of the volumetric tube 19 automatic calibration device based on the volumetric method in Example 1, the calibration method comprises the following steps:

[0051] (1) The liquid level values of the first standard tank 10 and the second standard tank 12 are respectively set in the liquid level collecting mechanism 7, and the number of commutations of the commutator 1 is set according to the standard value of the measured volumetric tube 19;

[0052] (2) The commutator 1 is connected with the second standard tank 12, and then the circulating pump 15 is started to make the displacement ball 16 in the volumetric tube 19 move in the volumetric tube 19;

[0053] (3) When the displacement ball 16 passes through the detection switch A 17 of the volumetric tube 19, the commutator 1 is switched to connect with the first standard tank 10, and the liquid discharge valve 13 of the second standard tank 12 is opened to be emptied;

[0054] When the liquid level reaches the set value of the first standard tank 10, the commutator 1 is switched to connect with the second standard tank 12, and then the electric lifting mechanism 9 on the first standard tank 10 is started to drive the camera 20 and the photoelectric switch 21 to move upward;

[0055] (4) After the wall-hung water in the first standard tank 10 falls, the standard liquid level is formed, and when the photoelectric switch 21 rises to the concave liquid surface of the standard liquid level along with the electric lifting mechanism 9, the refraction angle of the photoelectric switch 21 is offset, and a signal is sent to the liquid level collecting mechanism 7;

[0056] Then the electric lifting mechanism 9 on the first standard tank 10 is stopped by the liquid level collecting mechanism 7;

[0057] (6) The micro video camera shoots the liquid level value on the first standard tank 10, and transmits the data to the liquid level collecting mechanism 7, analyzes and records the data, and then opens the liquid discharge valve 13 on the first standard tank 10 to empty;

[0058] (7) When the commutator 1 switches to communicate with the second standard tank 12, the electric lifting mechanism 9 on the second standard tank 12 drives the photoelectric switch 21 and the camera to rise;

[0059] When the photoelectric switch 21 reaches the standard liquid level concave liquid surface of the second standard tank 12, the electric lifting mechanism 9 stops;

[0060] The micro video camera shoots the liquid level value on the second standard tank 12, and uses the collecting mechanism to analyze and record the data, and then opens the liquid discharge valve 13 on the second standard tank 12 to empty;

[0061] (8) When the displacement ball reaches the detection switch B18, the liquid inlet valve 2 is closed, the bypass valve 5 is opened, the metering is finished, and the scale on the last connected standard tank is shot by the camera, and then the collecting mechanism is used to analyze and record the data.

[0062] The present application realizes wireless automatic collection of the standard tank liquid level through data communication between the liquid level collecting mechanism 7 and the volumetric tube calibration platform 6, and reduces the labor intensity of personnel.

[0063] Through the liquid level collecting mechanism 7 to control the electric lifting mechanism 9, the camera 20 and the photoelectric switch 21, the judgment and reading of the standard tank liquid level value can be realized, and the data is transmitted to the liquid level collecting mechanism 7 and the volumetric tube calibration platform 6;

[0064] The photoelectric switch 21 is used for positioning at the standard liquid level concave liquid surface, which is more accurate, so that the camera 20 can accurately shoot the position of the liquid level concave liquid surface, and the error of reading data is effectively reduced.

[0065] Through the volumetric tube 19 standard value preset liquid level and the tank pouring times, the automatic switching of the first standard tank 10 and the second standard tank 12 can be realized by using the commutator 1, so as to reduce the number of staff and labor intensity.

[0066] Example 3

[0067] Reference Figure 1 and Figure 2 A volumetric tube automatic calibration device based on the volume method, comprising a volumetric tube calibration platform 6, a liquid level collecting mechanism 7, a commutator 1, a first standard tank 10, a second standard tank 12, a water tank 11, a circulating pump 15, a first pipeline 3 and a second pipeline 14.

[0068] The reversing device 1 is provided with one inlet and two outlets, and the two outlets of the reversing device 1 are connected with the inlets of the first standard tank 10 and the second standard tank 12 respectively.

[0069] The bottoms of the first standard tank 10 and the second standard tank 12 are respectively provided with liquid discharge valves 13 for discharging liquid into the water tank 11.

[0070] The inlet of the reversing device 1 is connected with the outlet of the first pipeline 3, and a liquid inlet valve 2 is further installed at the inlet of the reversing device 1.

[0071] The inlet of the first pipeline 3 is connected with the outlet of the measured volume tube 19, and the first pipeline 3 is further connected with a branch pipeline 4 in communication with the water tank 11 through a tee joint, and the branch pipeline 4 is provided with a bypass valve 5.

[0072] The circulating pump 15 is connected with the second pipeline 14, the inlet of the second pipeline 14 is connected with the water tank 11, and the outlet of the second pipeline 14 is connected with the inlet of the measured volume tube 19.

[0073] The first standard tank 10 and the second standard tank 12 are both provided with a tubular liquid level gauge 8 on one side, and the bottom of the tubular liquid level gauge 8 is fixedly connected with an electric lifting mechanism 9.

[0074] The electric lifting mechanism 9 is fixedly provided with a camera 20 and a photoelectric switch 21 on the supporting end.

[0075] The reversing device 1, the circulating pump 15 and the liquid level collecting mechanism 7 are electrically connected with the volume tube calibration platform 6 respectively.

[0076] The electric lifting mechanism 9, the camera 20 and the photoelectric switch 21 are electrically connected with the liquid level collecting mechanism 7 respectively.

[0077] The embodiment is further optimized on the basis of the above embodiment, and specifically:

[0078] The electric lifting mechanism 9 comprises a stepping motor 23 and a screw lifting platform 22, and the screw lifting platform 22 is driven by the stepping motor 23.

[0079] The stepping motor 23 is adopted to drive the screw lifting platform 22 to work, and the screw lifting platform 22 drives the camera 20 and the photoelectric switch 21 to realize the lifting action.

[0080] Embodiment 4

[0081] Reference Figure 1 and Figure 2 An automatic calibration device for volume tube based on volume method, comprising a volume tube calibration platform 6, a liquid level collecting mechanism 7, a reversing device 1, a first standard tank 10, a second standard tank 12, a water tank 11, a circulating pump 15, a first pipeline 3 and a second pipeline 14.

[0082] The reversing device 1 is provided with one inlet and two outlets, and the two outlets of the reversing device 1 are connected with the inlets of the first standard tank 10 and the second standard tank 12 respectively.

[0083] The bottoms of the first standard tank 10 and the second standard tank 12 are respectively provided with drain valves 13 for draining liquid into the water tank 11.

[0084] The inlet of the reversing device 1 is connected with the outlet of the first pipeline 3, and a liquid inlet valve 2 is further installed at the inlet of the reversing device 1.

[0085] The inlet of the first pipeline 3 is connected with the outlet of the measured volume tube 19, and the first pipeline 3 is further connected with a branch pipeline 4 in communication with the water tank 11 through a tee joint, and the branch pipeline 4 is provided with a bypass valve 5.

[0086] The circulating pump 15 is connected with the second pipeline 14, the inlet of the second pipeline 14 is connected with the water tank 11, and the outlet of the second pipeline 14 is connected with the inlet of the measured volume tube 19.

[0087] The first standard tank 10 and the second standard tank 12 are both provided with a tubular liquid level gauge 8 on one side, and the bottom of the tubular liquid level gauge 8 is fixedly connected with an electric lifting mechanism 9.

[0088] The supporting end of the electric lifting mechanism 9 is fixedly provided with a camera 20 and a photoelectric switch 21.

[0089] The reversing device 1, the circulating pump 15 and the liquid level collecting mechanism 7 are electrically connected with the volume tube calibration platform 6 respectively.

[0090] The electric lifting mechanism 9, the camera 20 and the photoelectric switch 21 are electrically connected with the liquid level collecting mechanism 7 respectively.

[0091] The embodiment is further optimized on the basis of the above embodiment, specifically:

[0092] The electric lifting mechanism 9, the camera 20 and the photoelectric switch 21 are all wirelessly connected with the liquid level collecting mechanism 7 through a wireless transmitter and a wireless receiver.

[0093] By adopting the wireless connection mode, the cumbersome wiring steps in the detection site are avoided.

[0094] Embodiment 5

[0095] Reference Figure 1 and Figure 2 An automatic calibration device for volume tubes based on the volume method, comprising a volume tube calibration platform 6, a liquid level collecting mechanism 7, a reversing device 1, a first standard tank 10, a second standard tank 12, a water tank 11, a circulating pump 15, a first pipeline 3 and a second pipeline 14.

[0096] The commutator 1 is provided with one inlet and two outlets, and the two outlets of the commutator 1 are connected to the inlets of the first standard tank 10 and the second standard tank 12 respectively.

[0097] A drain valve 13 for draining liquid into the pool 11 is provided at the bottom of each of the first standard tank 10 and the second standard tank 12 .

[0098] The inlet of the commutator 1 is connected to the outlet of the first pipeline 3 , and a liquid inlet valve 2 is also installed at the inlet of the commutator 1 .

[0099] The inlet of the first pipeline 3 is connected to the outlet of the measured volume tube 19 . The first pipeline 3 is also connected to a branch 4 communicated with the water pool 11 through a tee. A bypass valve 5 is provided on the branch 4 .

[0100] The circulation pump 15 is connected to the second pipeline 14 . The inlet of the second pipeline 14 is connected to the water pool 11 , and the outlet of the second pipeline 14 is connected to the inlet of the measured volume tube 19 .

[0101] A tubular liquid level gauge 8 is provided on one side of the first standard tank 10 and the second standard tank 12 , and an electric lifting mechanism 9 is fixedly connected to the bottom of the tubular liquid level gauge 8 .

[0102] A camera 20 and a photoelectric switch 21 are fixedly provided on the supporting end of the electric lifting mechanism 9 .

[0103] The commutator 1 , the circulating pump 15 and the liquid level acquisition mechanism 7 are electrically connected to the volume tube calibration platform 6 respectively.

[0104] The electric lifting mechanism 9 , the camera 20 and the photoelectric switch 21 are electrically connected to the liquid level acquisition mechanism 7 respectively.

[0105] This embodiment is further optimized based on the above embodiment, specifically:

[0106] The inlet of the first pipeline 3 and the outlet of the measured volume tube 19 are connected by quick-fit connectors that match each other.

[0107] The outlet of the second pipeline 14 and the inlet of the measured volume tube 19 are connected by a quick-release connector that matches each other.

[0108] By adopting the design of the quick-connect joint, it is more convenient to connect the measured volume tube 19 with the first pipeline 3 and the second pipeline 14.

[0109] The present invention is not limited to the above-mentioned embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. The contents after the changes still fall within the scope of protection of the present invention.

Claims

1. An automatic calibration device for a volumetric tube based on the volumetric method, comprising a volumetric tube calibration platform, characterized in that: It also includes a liquid level collection mechanism, a commutator, a first standard tank, a second standard tank, a water tank, a circulation pump, a first pipeline and a second pipeline; The diverter is provided with one inlet and two outlets, the two outlets of the diverter are respectively connected to the inlets of the first standard tank and the second standard tank, and the bottoms of the first standard tank and the second standard tank are respectively provided with drain valves for draining liquid into the water pool; The inlet of the commutator is connected to the outlet of the first pipeline, and a liquid inlet valve is installed at the inlet of the commutator. The inlet of the first pipeline is connected to the outlet of the measured volume tube. The first pipeline is also connected to a branch connected to the water tank through a tee, and a bypass valve is provided on the branch. The circulation pump is connected to the second pipeline, the inlet of the second pipeline is connected to the water pool, and the outlet of the second pipeline is connected to the inlet of the measured volume tube; A tubular liquid level gauge is provided on one side of the first standard tank and the second standard tank, and an electric lifting mechanism is fixedly connected to the bottom of the tubular liquid level gauge, and a camera and a photoelectric switch are fixed on the supporting end of the electric lifting mechanism; The commutator, the circulating pump and the liquid level acquisition mechanism are electrically connected to the volume tube calibration platform respectively, and the electric lifting mechanism, the camera and the photoelectric switch are electrically connected to the liquid level acquisition mechanism respectively; The electric lifting mechanism includes a stepping motor and a screw lifting platform, and the screw lifting platform is driven by the stepping motor.

2. The automatic calibration device for a volume tube based on the volumetric method according to claim 1, characterized in that: The liquid inlet valve and the bypass valve are both electric valves, and the liquid inlet valve and the bypass valve are electrically connected to the volume tube calibration platform respectively.

3. The automatic calibration device for a volume tube based on the volumetric method according to claim 1, characterized in that: The drain valve is an electric valve, and the drain valve is electrically connected to the volume tube calibration station.

4. The automatic calibration device for a volume tube based on the volumetric method according to claim 1, characterized in that: The electric lifting mechanism, camera and photoelectric switch are all connected with the liquid level acquisition mechanism via radio.

5. The automatic calibration device for a volume tube based on the volumetric method according to claim 1, characterized in that: A quick-release connector that cooperates with each other is connected between the inlet of the first pipeline and the outlet of the measured volume tube.

6. The automatic calibration device for a volume tube based on the volumetric method according to claim 1, characterized in that: A quick-fit connector that cooperates with each other is connected between the outlet of the second pipeline and the inlet of the measured volume tube.

7. A volumetric tube automated calibration method based on volumetric method, characterized by: An automatic calibration device for a volume tube based on a volumetric method according to any one of claims 1 to 6, wherein the calibration method comprises the following steps: (1) Set the liquid level values ​​of the first standard tank and the second standard tank in the liquid level acquisition mechanism respectively, and set the number of reversing times of the commutator according to the standard value of the measured volume tube; (2) Connect the commutator to the second standard tank, and then start the circulation pump to make the displacement ball in the volume tube move in the volume tube; (3) When the displacement ball passes through the detection switch A of the volume tube, the reversing device switches to connect to the first standard tank and opens the drain valve of the second standard tank to empty it. When the liquid level reaches the set value of the first standard tank, the reversing device switches to connect to the second standard tank, and then the electric lifting mechanism on the first standard tank is started, and drives the camera and photoelectric switch to move upward; (4) After the wall water in the first standard tank flows in and falls, a standard liquid level is formed. When the photoelectric switch rises with the electric lifting mechanism to the concave liquid surface of the standard liquid level, the refraction angle of the photoelectric switch is offset and a signal is sent to the liquid level acquisition mechanism, which then controls the electric lifting mechanism on the first standard tank to stop; (6) The micro camera captures the liquid level value on the first standard tank and transmits the data to the liquid level acquisition mechanism for analysis and recording, and then opens the drain valve of the first standard tank to empty it; (7) When the commutator switches to connect to the second standard tank, the electric lifting mechanism on the second standard tank drives the photoelectric switch and the camera to rise. When the photoelectric switch reaches the concave liquid surface of the standard liquid level of the second standard tank, the electric lifting mechanism stops, and the micro camera takes the liquid level value on the second standard tank. The data is analyzed and recorded by the acquisition mechanism, and then the drain valve of the second standard tank is opened to empty it. (8) When the displacement ball in the volume tube reaches the detection switch B, the liquid inlet valve is closed, the bypass valve is opened, and the measurement is completed. The camera is used to shoot the scale on the last connected standard tank, and then the data is analyzed and recorded using the acquisition mechanism.

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