阅读说明：本技术 一种巴歇尔槽流量计自动在线校准装置及校准方法 (Automatic online calibration device and calibration method for Bashall tank flowmeter ) 是由 刘敦利 赵志方 马晓春 陈文琳 郭丽 王杰 雷镇嘉 许德福 于 2021-08-31 设计创作，主要内容包括：本发明公开了一种巴歇尔槽流量计自动在线校准装置及校准方法,涉及流量计量设备技术领域,主要目的是提供一种能够提高测量的精准度的巴歇尔槽流量计自动在线校准装置。本发明的主要技术方案为：一种巴歇尔槽流量计自动在线校准装置,包括：支撑部件,第一架体和第二架体分别架设在巴歇尔槽的两侧,第一支撑梁的两端分别移动连接于第一架体和第二架体,第二支撑梁移动连接于第一支撑梁；水位测量部件,水位测量部件设置在第二支撑梁的一端；宽度测量部件,宽度测量部件设置在第二支撑梁的另一端,测量杆转动连接于第二支撑梁,第一驱动部件连接于测量杆,接触部件的两端朝向巴歇尔槽的边缘方向延伸。本发明主要用于在线校准巴歇尔槽流量计。(The invention discloses an automatic online calibration device and method for a Bashall tank flowmeter, relates to the technical field of flow metering equipment, and mainly aims to provide the automatic online calibration device for the Bashall tank flowmeter, which can improve the measurement accuracy. The main technical scheme of the invention is as follows: an automatic online calibrating device for a Parshall cell flowmeter, comprising: the first support body and the second support body are respectively erected on two sides of the Parshall trough, two ends of the first support beam are respectively movably connected with the first support body and the second support body, and the second support beam is movably connected with the first support beam; the water level measuring part is arranged at one end of the second supporting beam; and the width measuring component is arranged at the other end of the second supporting beam, the measuring rod is rotatably connected to the second supporting beam, the first driving component is connected to the measuring rod, and two ends of the contact component extend towards the edge direction of the Barshall groove. The method is mainly used for calibrating the flow meter of the Parshall tank on line.)

1. An automatic online calibrating device of a Parshall's groove flowmeter, characterized by comprising:

the supporting component comprises a first frame body, a second frame body, a first supporting beam and a second supporting beam, the first frame body and the second frame body are respectively erected on two sides of the Parshall groove, two ends of the first supporting beam are respectively movably connected to the first frame body and the second frame body, and the second supporting beam is movably connected to the first supporting beam;

a water level measuring part provided at one end of the second support beam;

the width measuring component is arranged at the other end of the second supporting beam and comprises a measuring rod, a contact component and a first driving component, the measuring rod is rotatably connected to the second supporting beam, the first driving component is connected to the measuring rod, and two ends of the contact component extend towards the edge direction of the Barschel groove.

2. The automatic on-line calibration device for the Parshall tank flowmeter as claimed in claim 1,

the contact component comprises a support rod and contactors, and the contactors are arranged at two ends of the support rod.

3. The automatic on-line calibration device for the Parshall tank flowmeter as claimed in claim 2,

the contactor includes pressure sensor, expanding spring and extensible member, pressure sensor sets up in the bracing piece, expanding spring's one end top connect in pressure sensor, the one end of extensible member connect in expanding spring, the other end orientation is kept away from pressure sensor's direction extends.

4. The automatic on-line calibration device for the Parshall tank flowmeter as claimed in claim 3,

the first supporting beam is provided with a first rack, the second supporting beam is provided with a second driving part, the second driving part comprises a driving motor and a rotating gear, the second driving motor is connected to the rotating gear, and the rotating gear is meshed with the first rack.

5. The automatic on-line calibration device for the Parshall tank flowmeter as claimed in claim 4, further comprising:

a control component connected to the second drive component and the pressure sensor.

6. The automatic on-line calibration device for the Parshall tank flowmeter as claimed in claim 1,

the water level measuring component comprises a barrel, a rod body, a floating ball and a communicating component, the barrel is rotatably connected to the second supporting beam, the rod body is arranged inside the barrel, the floating ball is arranged on the rod body, the communicating component is arranged on the lower portion of the barrel, and water inlets are formed in two ends of the communicating component.

7. The automatic on-line calibration device for the Parshall tank flowmeter as claimed in claim 6,

the water level measuring part also comprises a horizontal part, and the horizontal part is arranged at the other end of the cylinder body.

8. The automatic on-line calibration device for the Parshall tank flowmeter as claimed in claim 6,

the water level measuring part also comprises a flow guide part, and the flow guide part is arranged on two sides of the communicating part.

9. An automatic on-line calibration device for a Parshall tank flowmeter according to any one of claims 1 to 8,

the support component further comprises a connecting frame, and two ends of the connecting frame are respectively connected to the first frame body and the second frame body.

10. An automatic online calibration method for a Parshall tank flowmeter is characterized by comprising the following steps:

erecting a support member on the upper part of the Parshall tank;

measuring the widths of different positions of the Parshall groove through a width measuring component and obtaining width data;

measuring the water level of the middle position of the Parshall tank through a water level measuring component and obtaining water level data;

calculating a standard instantaneous flow value Q according to the obtained width data and water level data_sThe flow indicating error of the flow meter of the detected open channel is E ═ Q_i-Q_s)/Q_s×100％；

And the control system outputs a calibration original record and completes the online calibration of the open channel flowmeter of the Parshall cell.

Technical Field

The invention relates to the technical field of flow metering equipment, in particular to an automatic online calibration device and method for a Bashall tank flowmeter.

Background

The open channel weir notch flowmeter is a channel flow metering device, and is extensively used for metering open channel water delivery flow in the links of cross-drainage basin water transfer, agricultural irrigation and intermediate water discharge, etc. its working principle is that a standard weir notch is set in the open channel, and the water level is measured according to the defined position, and because the flow rate passed through the weir notch and water level are formed into correspondent relationship, it can be converted into instantaneous flow rate according to flow rate formula or empirical relational expression of both them from measured real-time water level. The Bashel trough flowmeter is the most widely and mature open channel weir trough flowmeter at present, and accounts for more than 95% of the flow rate. The flowmeter for the Parshall tank is mainly composed of the Parshall tank and the open channel flowmeter, the Parshall tank can have various specifications, and the open channel flowmeter device has the functions of measuring water level in real time and converting the water level into instantaneous flow at a specified position, and has the functions of conventional flowmeters such as accumulated flow, data storage and real-time transmission.

In summary, the accuracy of the flow metering of the baschel tank flow meter is mainly affected by two aspects: the accuracy of the Parshall tank sizing and the accuracy of the open channel flowmeter water level measurements. The machining materials of the Parshall groove are greatly different according to different sizes, and comprise PVC, iron plates, stainless steel plates, concrete and the like. Due to factors such as processing level, use conditions and ambient temperature, the actual size and the designed size of the used Parshall cell are larger and larger, and the accuracy of flow measurement is affected. Meanwhile, the accuracy of water level measurement of the open channel flowmeter is deeply influenced by the installation position of the open channel flowmeter, the water surface floating amplitude and the like, and further the accuracy of flow measurement is also influenced.

In the prior art, the main method for online calibration of the flowmeter of the Parshall tank is an artificial dimension method, namely, the dimension and the real-time liquid level of the Parshall tank are measured manually, and the method has the following problems:

1. the danger coefficient is large, manual measurement is required to be close to an open channel, the water flow in the channel is large, the water flow is turbulent, and the wading danger is easy to occur;

2. when the dimension of the Parshall tank is measured, only the dimension of the position which is not submerged can be measured, and the measurement result has limitation to the underwater dimension which cannot be measured;

3. artificial random errors introduced by manual measurement are large, and the measurement accuracy is influenced;

4. the error of the real-time liquid level is large, the floating amplitude of the water surface is large, and the error of the measurement result is large by using a conventional water level gauge.

Disclosure of Invention

In view of this, an embodiment of the present invention provides an automatic online calibration device for a baschel tank flow meter, and mainly aims to provide an automatic online calibration device for a baschel tank flow meter, which can improve the measurement accuracy.

In order to achieve the purpose, the invention mainly provides the following technical scheme:

in one aspect, an embodiment of the present invention provides an automatic online calibration apparatus for a baschel tank flowmeter, including:

the supporting component comprises a first frame body, a second frame body, a first supporting beam and a second supporting beam, the first frame body and the second frame body are respectively erected on two sides of the Parshall groove, two ends of the first supporting beam are respectively movably connected to the first frame body and the second frame body, and the second supporting beam is movably connected to the first supporting beam;

a water level measuring part provided at one end of the second support beam;

the width measuring component is arranged at the other end of the second supporting beam and comprises a measuring rod, a contact component and a first driving component, the measuring rod is rotatably connected to the second supporting beam, the first driving component is connected to the measuring rod, and two ends of the contact component extend towards the edge direction of the Barschel groove.

Further, the contact component comprises a support rod and contactors, and the contactors are arranged at two ends of the support rod.

Further, the contactor includes pressure sensor, expanding spring and extensible member, pressure sensor sets up in the bracing piece, expanding spring's one end top connect in pressure sensor, the one end of extensible member connect in expanding spring, the other end orientation is kept away from pressure sensor's direction extends.

Furthermore, first supporting beam sets up first rack, set up second drive assembly on the second supporting beam, second drive assembly includes driving motor and rotating gear, second driving motor connect in rotating gear, rotating gear with first rack intermeshing.

Further, a control component connected to the second drive component and the pressure sensor.

Furthermore, the water level measurement component comprises a barrel, a rod body, a floating ball and a communicating component, the barrel is rotatably connected to the second supporting beam, the rod body is arranged inside the barrel, the floating ball is arranged on the rod body, the communicating component is arranged on the lower portion of the barrel, and water inlets are formed in two ends of the communicating component.

Further, the water level measuring component also comprises a horizontal component, and the horizontal component is arranged at the other end of the cylinder body.

Furthermore, the water level measuring part also comprises a flow guide part, and the flow guide part is arranged on two sides of the communicating part.

Furthermore, the support component further comprises a connecting frame, and two ends of the connecting frame are respectively connected to the first frame body and the second frame body.

Further, the supporting part also comprises a moving wheel, and the moving wheel is respectively arranged at the bottoms of the first frame body and the second frame body.

In another aspect, an embodiment of the present invention provides an automatic online calibration method for a baschel tank flowmeter, including the following steps:

erecting a support member on the upper part of the Parshall tank;

measuring the widths of different positions of the Parshall groove through a width measuring component and obtaining width data;

measuring the water level of the middle position of the Parshall tank through a water level measuring component and obtaining water level data;

calculating a standard instantaneous flow value Q according to the obtained width data and water level data_sThe flow indicating error of the flow meter of the detected open channel is E ═ Q_i-Q_s)/Q_s×100％；

And the control system outputs a calibration original record and completes the online calibration of the open channel flowmeter of the Parshall cell.

Compared with the prior art, the invention has the following technical effects:

in the technical scheme provided by the embodiment of the invention, the supporting part is used for supporting the water level measuring part and the width measuring part and comprises a first frame body, a second frame body, a first supporting beam and a second supporting beam, the first frame body and the second frame body are respectively erected at two sides of the Bashall groove, two ends of the first supporting beam are respectively movably connected with the first frame body and the second frame body, and the second supporting beam is movably connected with the first supporting beam; the water level measuring part is used for measuring the water level and is arranged at one end of the second supporting beam; the width measuring component is used for measuring the widths of different positions of the Barshall tank, the width measuring component is arranged at the other end of the second supporting beam and comprises a measuring rod, a contact component and a first driving component, the measuring rod is rotatably connected to the second supporting beam, the first driving component is connected to the measuring rod, two ends of the contact component extend towards the edge direction of the Barshall tank, compared with the prior art, the size and the real-time liquid level of the Barshall tank are manually measured, the danger coefficient is large, the manual measurement is required to be close to an open channel, the water flow in the channel is large, the water flow is turbulent, the wading danger is easy to occur, meanwhile, the manual measurement introduces large artificial random errors, and the measuring accuracy is influenced; and the size of the unsubmerged position can only be measured when the size of the Parshall tank is measured, the underwater size cannot be measured, the measurement result has limitation, the error of the measured real-time liquid level is large, the floating amplitude of the water surface is large, and the error of the measurement result is large by using a conventional water level gauge.

Drawings

FIG. 1 is a schematic structural diagram of an automatic on-line calibration device for a Parshall tank flowmeter according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a width measurement component according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a water level measuring unit according to an embodiment of the present invention;

fig. 4 is a schematic top view of a water level measuring component according to an embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

In one aspect, as shown in fig. 1 to 4, an embodiment of the present invention provides an automatic online calibration apparatus for a baschel tank flowmeter, including:

the supporting component comprises a first frame body 11, a second frame body 12, a first supporting beam 13 and a second supporting beam 14, wherein the first frame body 11 and the second frame body 12 are respectively erected at two sides of the Bashall groove, two ends of the first supporting beam 13 are respectively movably connected to the first frame body 11 and the second frame body 12, and the second supporting beam 14 is movably connected to the first supporting beam 13;

a water level measuring part 2, the water level measuring part 2 being provided at one end of the second support beam 14;

and a width measuring part disposed at the other end of the second support beam 14, the width measuring part including a measuring rod 31, a contact part, and a first driving part 33, the measuring rod 31 being rotatably connected to the second support beam 14, the first driving part 33 being connected to the measuring rod 31, both ends of the contact part extending toward the edge of the baschel tank.

In the technical scheme provided by the embodiment of the invention, the supporting part is used for supporting the water level measuring part 2 and the width measuring part, and comprises a first frame body 11, a second frame body 12, a first supporting beam 13 and a second supporting beam 14, wherein the first frame body 11 and the second frame body 12 are respectively erected at two sides of a Parshall groove, two ends of the first supporting beam 13 are respectively movably connected to the first frame body 11 and the second frame body 12, and the second supporting beam 14 is movably connected to the first supporting beam 13; the water level measuring part 2 is used for measuring the water level, and the water level measuring part 2 is arranged at one end of the second supporting beam 14; the width measuring part is used for measuring the widths of different positions of the Barshall tank, the width measuring part is arranged at the other end of the second supporting beam 14 and comprises a measuring rod 31, a contact part and a first driving part 33, the measuring rod 31 is rotatably connected to the second supporting beam 14, the first driving part 33 is connected to the measuring rod 31, two ends of the contact part extend towards the edge direction of the Barshall tank, compared with the prior art, the manual measurement of the size and the real-time liquid level of the Barshall tank has large danger coefficient, the manual measurement must be close to an open channel, the water flow in the channel is large, the water flow turbulence is rapid, the wading danger is easy to occur, meanwhile, the manual measurement introduces large artificial random errors, and the measurement accuracy is influenced; and the size of the unsubmerged position can only be measured when measuring the size of the Parshall tank, the underwater size cannot be measured, the measurement result has limitation, the water surface floating amplitude is large, and the error of the measurement result is large by using a conventional water level gauge.

The supporting component is used for supporting the water level measuring component 2 and the width measuring component, and comprises a first frame body 11, a second frame body 12, a first supporting beam 13 and a second supporting beam 14, wherein the first frame body 11 and the second frame body 12 are respectively erected at two sides of a Parshall groove, two ends of the first supporting beam 13 are respectively movably connected with the first frame body 11 and the second frame body 12, the second supporting beam 14 is movably connected with the first supporting beam 13, the first frame body 11 and the second frame body 12 can support the first supporting beam 13 and the second supporting beam 14, moving wheels 16 are arranged at the bottoms of the first frame body 11 and the second frame body 12, the moving wheels 16 can drive the first frame body 11 and the second frame body 12 to move, the moving wheels 16 adopt universal wheels, and, the moving wheel 16 is provided with a motor, the motor can drive the moving wheel 16 to rotate, and meanwhile, the motor can be controlled by a control system; the water level measuring component 2 is used for measuring the water level, the water level measuring component 2 is arranged at one end of the second supporting beam 14, the water level measuring component 2 comprises a cylinder 21, a rod 22, a floating ball 23 and a communicating component 24, the cylinder 21 is rotatably connected to the second supporting beam 14, the rod 22 is arranged inside the cylinder 21, the floating ball 23 is arranged on the rod 22, the communicating component 24 is arranged at the lower part of the cylinder 21, water inlets 241 are arranged at two ends of the communicating component 24, after the water level measuring component 2 is moved to a set position, the cylinder 21 rotates around the axis of the cylinder, the cylinder 21 moves underwater until the communicating component 24 is contacted with the bottom of the Bashall groove, water enters between the cylinder 21 and the rod 22 from the water inlet 241 of the communicating component 24, the floating ball 23 floats upwards under the action of the water, the position of the floating ball 23 is the same as the water level of the Bashall groove by utilizing the principle of the communicating device, and the technical effect of accurately measuring the water level is achieved, in addition, the water level is in the cylinder 21, so that the influence caused by the severe fluctuation range of the water level is avoided, and the accuracy of water level measurement is ensured; the width measuring component is used for measuring the widths of different positions of the Barshall groove, the width measuring component is arranged at the other end of the second supporting beam 14, the width measuring component comprises a measuring rod 31, a contact component and a first driving component 33, the measuring rod 31 is rotatably connected to the second supporting beam 14, the first driving component 33 is connected to the measuring rod 31, two ends of the contact component extend towards the edge direction of the Barshall groove, when the width of the Barshall groove needs to be measured, the first driving component 33 drives the measuring rod 31 to rotate around the axis thereof, the measuring rod 31 is lowered to a set position, then the second supporting beam 14 is moved towards the edge direction of the Barshall groove, one end of the contact component is contacted with the side surface of the Barshall groove, at the moment, the width of the Barshall groove is taken as a starting position, then the second supporting beam 14 is moved until the other end of the contact component is contacted with the edge of the Barshall groove, the sum of the moving distance of the second supporting beam 14 and the length of the contact part is the width of the Parshall groove, in the technical scheme, the supporting part is erected on the upper part of the Parshall groove, the first supporting beam 13 and the second supporting beam 14 can drive the water level measuring part 2 and the width measuring part to move transversely, the measuring positions of the water level measuring part 2 and the width measuring part are adjusted, the water level of the Parshall groove is measured by the water level measuring part 2, the width measuring part is in contact with the side wall of the Parshall groove through the two contact parts, and the widths of the Parshall groove at different positions are accurately measured through the moving distance of the measuring rod 31, so that the technical effect of improving the measuring accuracy is achieved.

Further, the contact member includes a support rod 321 and a contactor 322, and the contactor 322 is disposed at both ends of the support rod 321. In this embodiment, a contact part is further defined, the contactor 322 is disposed at two ends of the supporting rod 321, the supporting rod 321 is vertically connected to the measuring rod 31, the contactor 322 includes a pressure sensor 3221, a telescopic spring 3222 and a telescopic member 3223, the pressure sensor 3221 is disposed in the supporting rod 321, one end of the telescopic spring 3222 is connected to the pressure sensor 3221, one end of the telescopic member 3223 is connected to the telescopic spring 3222, and the other end of the telescopic member 3223 extends in a direction away from the pressure sensor 3221, the pressure sensor 3221 is disposed in the supporting rod 321, the telescopic spring 3222 is disposed between the telescopic member 3223 and the pressure sensor 3221, when the telescopic member 3223 contacts with the bashall groove, the telescopic spring 3222 compresses and presses the pressure sensor 3221, the pressure sensor 3221 transmits a signal, the second supporting beam 14 stops moving, which not only can improve the measuring accuracy, but also can prevent the supporting rod 321 from directly contacting with the side wall of the bashall groove to cause damage, thereby achieving the technical effect of protecting the contact part.

Further, the first support beam 13 is provided with a first rack, the second support beam 14 is provided with a second driving part 131, the second driving part 131 comprises a driving motor and a rotating gear, the second driving motor is connected to the rotating gear, and the rotating gear is meshed with the first rack. In this embodiment, the first supporting beam 13 and the second supporting beam 14 are further limited, the first rack is disposed on the first supporting beam 13, the second driving member 131 is disposed on the second supporting beam 14, so that the rotating gear is engaged with the first rack, and the driving motor drives the rotating gear to rotate, so that the second supporting beam 14 can move on the first supporting beam 13, thereby achieving the technical effect of facilitating the movement of the second supporting beam 14.

Further, the control section 4 is connected to the second driving section 131 and the pressure sensor 3221. In this embodiment, the control component 4 is added, the control component 4 is connected to the second driving component 131 and the pressure sensor 3221, after the pressure sensor 3221 receives the pressure generated by the extension spring 3222, the pressure sensor 3221 transmits a signal to the control component 4, and the control component 4 controls the second driving component 131 to stop working, so that the technical effect of conveniently controlling the position of the second supporting beam 14 is achieved.

Further, the water level measuring part 2 further includes a horizontal part 25, and the horizontal part 25 is disposed at the other end of the cylinder 21. In this embodiment, the water level measuring component 2 is further limited, the horizontal component 25 is arranged at the other end of the cylinder 21, and the horizontal component 25 can display whether the cylinder 21 is in a vertical state in real time, so that the technical effect of avoiding the water level measuring error caused by inclination is achieved.

Further, the water level measuring part 2 further includes a guide part 26, and the guide part 26 is disposed at both sides of the communication part 24. In this embodiment, the water level measuring part 2 is further defined, the flow guiding parts 26 are disposed on two sides of the communicating part 24, and since the communicating part 24 needs to contact with the bottom of the bashall groove, the speed of the water flow affects the position of the communicating part 24, which causes the communicating part 24 to deviate, so that the communicating part 24 tilts, therefore, the flow guiding parts 26 are disposed on two sides of the communicating part 24, the flow guiding parts 26 can enable the water flow to flow from two sides of the flow guiding part 26, the impact force of the water flow on the communicating part 24 is reduced, and the technical effect of preventing the communicating part 24 from tilting is achieved.

Further, the support member further includes a connection frame 15, and both ends of the connection frame 15 are respectively connected to the first frame body 11 and the second frame body 12. In this embodiment, further limited the support component, set up link 15 at the both ends of first support body 11 and second support body 12, link 15 can support first support body 11 and second support body 12, can the auxiliary stay first supporting beam 13, improves support component's support nature.

In another aspect, an embodiment of the present invention provides an automatic online calibration method for a baschel tank flowmeter, including the following steps:

101. the support member was erected on the upper part of the Parshall cell.

102. The widths of the different positions of the Parshall cell are measured by the width measuring means and width data are obtained.

103. The water level of the intermediate position of the Parshall tank is measured by the water level measuring part and water level data is obtained.

104. Calculating a standard instantaneous flow value Q according to the obtained width data and water level data_sIs detected to beThe flow indication error of the canal flowmeter is E ═ Q_i-Q_s)/Q_s×100％。

105. And the control system outputs a calibration original record and completes the online calibration of the open channel flowmeter of the Parshall cell.

The step 2 comprises the following steps:

1021. three points of 25%, 50% and 75% were selected in the length range and height range according to the position of the rear part of the Parshall tank, to constitute 9 measurement points.

1022. The control part controls the driving part to make the width measuring part move back and forth and up and down, and makes the width measuring part move to a measuring point S of one of the initial positions₀。

1023. The control part controls the second driving part to make the second support beam move in the throat area of the Barschel groove, and the width measuring part moves to one end of the Barschel groove and contacts with the side wall of the Barschel groove to form a first position S₁The width measuring part moves transversely to the other end of the Parshall groove and contacts with the side wall of the other end of the Parshall groove to form a second position S₂I.e. the width data of the marshall groove measured at one of the measurement points.

1024. Repeat step 2.3 to measure the width data of the remaining 8 measurement points.

1025. The average d is calculated from the width data of the 9 measurement points.

The step 3 comprises the following steps:

1031. the control component controls the driving component to enable the water level measuring component to move back and forth to enable the water level measuring component to move to the 2/3 position of the Bashall tank, and controls the driving component to enable the water level measuring component to move left and right through the control component to enable the water level measuring component to move to the central line position of the Bashall tank.

1032. The control component controls the driving component to move the water level measuring component up and down, the communication component moves to the bottom of the Parshall tank, and the horizontal component is observed to determine that the cylinder body and the rod body are in vertical positions.

1033. Water in the channel enters the cylinder through the communicating component, the floating ball moves up and down along with the water level, and the measured water level value is transmitted to the control system through the signal output component.

1034. And (5) waiting for the water level to be stable, recording 10 groups of real-time water level values within 10min, and simultaneously reading the instantaneous flow value of the detected open channel flowmeter.

1035. The arithmetic mean value of the water level is used as a final water level value h, and the arithmetic mean value of the instantaneous flow value of the detected open channel flowmeter is used as a final instantaneous flow value Q_i。

The embodiment of the invention provides an automatic online calibration device for a Bashall tank flowmeter, which realizes automation of a calibration process, improves the accuracy of a calibration result and avoids wading danger caused by manual measurement; random errors introduced by manual measurement are avoided; the measurement of the underwater part which cannot be manually realized is realized, and the accuracy of the throat width measurement is improved; the accuracy of water level measurement is improved by adopting the water level measuring device.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.