A circular pipe fix-point method for flow sensor

Abstract

This invention relates to a method for positioning a flow sensor in a circular pipe. The method includes: setting two target plates inside the pipe; setting multiple equally spaced points within a cross-section orthogonal to the pipe's axial direction; drawing arcs towards the target plates with the multiple equally spaced points as centers and a compass as the radius; connecting the intersections of the arcs to form a regular polygon; taking the center point of the regular polygon as the dot; and defining the line connecting the dots on the two target plates as the central axis of the pipe; setting a theodolite inside the pipe, with the angle A between the line connecting the transmitter and receiver and the central axis; adjusting the horizontal angle of the theodolite's horizontal circle to A; adjusting the vertical circle of the theodolite, setting its angle to B; placing point U upstream of the pipe's inner wall with vertical circle angle B facing the pipe's inner wall, and point D downstream of the pipe's inner wall with vertical circle angle B facing the pipe's inner wall; and installing the transmitter and receiver at points U and D, respectively. This method can accurately position the flow sensor, which is beneficial for improving measurement accuracy.

Description

Technical Field

[0001] This invention relates to the field of pipeline flow measurement technology, and more specifically, to a method for positioning a flow sensor in a circular pipeline. Background Technology

[0002] With industrial development, flow measurement is frequently required in fields such as wastewater treatment, municipal drainage, and hydropower generation. Among these applications, ultrasonic flow sensors, developed in the last decade or so with the rapid advancement of integrated circuit technology, are instruments used to measure pipeline flow. Ultrasonic flow sensors are suitable for measuring fluids that are difficult to access or observe, as well as for large-diameter pipes. Ultrasonic flow sensors generally employ a time-difference measurement principle: the first probe emits a signal that passes through the fluid and is received by the second probe; simultaneously, the second probe emits a signal that is received by the first probe. Due to the influence of fluid velocity, there is a time difference between the two signals. This time difference can be used to calculate the flow velocity, and thus the flow rate can be determined from the flow velocity.

[0003] However, in related technologies, when installing ultrasonic flow sensors, the installation position of the ultrasonic flow sensor inside the circular pipe is not accurately positioned, resulting in the upstream and downstream sensors not receiving effective ultrasonic signals, which in turn leads to poor measurement accuracy of the flow detection system. Summary of the Invention

[0004] The present invention aims to at least partially solve one of the technical problems in the related art.

[0005] Therefore, embodiments of the present invention propose a method for positioning a flow sensor in a circular pipe. This method can accurately locate the installation position of the flow sensor, which is beneficial to improving the measurement accuracy of the flow sensor.

[0006] The circular pipe positioning method for the flow sensor according to an embodiment of the present invention includes: S1: setting a target plate inside the circular pipe;

[0007] S2: Multiple equally spaced points are provided in a cross-section orthogonal to the axial direction of the pipe, and the multiple equally spaced points are arranged at equal intervals along the circumference of the pipe;

[0008] S3: On a cross section orthogonal to the axial direction of the pipe, draw arcs on the target plate with the multiple equally divided points as centers and the radius as a compass. Connect the intersection points of the arcs to form a regular polygon, and take the center point of the regular polygon as the circle point.

[0009] S4: Set another target plate along one side of the axial direction of the pipe, repeat S2 and S3 to obtain two dots at different positions, and define the line connecting the two dots as the central axis of the pipe.

[0010] S5: Install a theodolite inside the pipe and align the theodolite with the central axis;

[0011] S6: Each set of flow sensors includes a transmitter and a receiver, and the angle between the line connecting the transmitter and the receiver and the central axis is A. Adjust the horizontal angle of the theodolite's level plate to A.

[0012] S7: Adjust the vertical circle of the theodolite, set the angle of the vertical circle to B, take the upstream point facing the inner wall of the pipe as point U, and the downstream point facing the inner wall of the pipe as point D. The transmitter and the receiver are installed at points U and D respectively.

[0013] According to an embodiment of the present invention, the circular pipe positioning method for a flow sensor determines the central axis of the pipe by drawing an arc with multiple equally divided points, which can improve the positioning accuracy of the pipe axis. Furthermore, by using the above method to lay out the theodolite, the installation position of the flow sensor can be accurately located, which is beneficial to improving the measurement accuracy of the flow sensor.

[0014] In some embodiments, S3 further includes: drawing a first arc on the target plate with four equally spaced dividing points as centers and the drawing compass as the radius in a cross section orthogonal to the axial direction of the pipe; and connecting the intersections of the four first arcs to form a first square.

[0015] In a cross section orthogonal to the axial direction of the pipe, with the other four equally spaced dividing points as centers and the drawing compass as the radius, draw a second arc on the target plate, and connect the intersection points of the four second arcs to form a second square;

[0016] The midpoint of the line connecting the center point of the first square and the center point of the second square is taken as the circle point.

[0017] In some embodiments, the flow sensors are in four groups, and the angle A between the line connecting the transmitter and the receiver of each group of flow sensors and the central axis is 65°. The horizontal angle of the theodolite's level plate is adjusted to 65°, and each group of flow sensors is arranged at intervals along the height direction of the pipe.

[0018] In some embodiments, the flow sensor includes a first group of sensors, a second group of sensors, a third group of sensors, and a fourth group of sensors.

[0019] The vertical disk angle B corresponding to the first group of sensors is greater than or equal to 36° and less than or equal to 40°;

[0020] The vertical angle B corresponding to the second group of sensors is greater than or equal to 71° and less than or equal to 75°;

[0021] The vertical disk angle B corresponding to the third group of sensors is greater than or equal to 104° and less than or equal to 108°.

[0022] The vertical angle B corresponding to the fourth group of sensors is greater than or equal to 139° and less than or equal to 143°.

[0023] In some embodiments, "the transmitter and the receiver are respectively installed at point U and point D", the method further includes the following steps:

[0024] A correction template is made according to the mounting holes on the sensor base, and the correction template is provided with correction holes corresponding to the mounting holes.

[0025] Place the correction template at points U and D;

[0026] The position of the mounting hole is determined by the correction hole on the correction template so that the sensor base is fixed to the inner wall of the pipe through the mounting hole;

[0027] Both the receiver and the transmitter are mounted on their respective sensor bases.

[0028] In some embodiments, "mounting both the receiver and the transmitter on the corresponding sensor base" further includes the following step:

[0029] The receiver and transmitter in the same group are pre-fixed to the corresponding sensor base;

[0030] The receivers and transmitters in the same group are calibrated using a laser pointer;

[0031] The sensor base is locked to the inner wall of the pipe, and the receiver and the transmitter are locked to the corresponding sensor bases.

[0032] In some embodiments, the method further includes the step of: repositioning the theodolite to the placement point of the pipeline;

[0033] Align the laser focusing point of the theodolite sequentially with the center points of the probes of each receiver and transmitter, and record the values ​​of the horizontal and vertical circles of the theodolite;

[0034] The values ​​of the horizontal and vertical discs are compared with the initial values ​​of points U and D. When the error is less than the set value, the flow sensor installation is complete.

[0035] In some embodiments, S5 further includes:

[0036] A theodolite mounting frame is welded to the bottom of the pipe. The theodolite mounting frame is located between the two target plates, and the length direction of the theodolite mounting frame is orthogonal to the central axis of the pipe.

[0037] Adjust the height of the theodolite mounting frame so that the top of the theodolite mounting frame is level with the central axis of the pipe;

[0038] Install the theodolite on top of the theodolite mounting bracket, adjust the horizontal angle of the theodolite to 0° or 180°, the vertical angle of the theodolite to 90°, and align the theodolite with the center of the circle on the two target plates. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of a circular pipe positioning method for a flow sensor according to an embodiment of the present invention, in which a target plate and a theodolite are set inside the pipe.

[0040] Figure 2 This is a schematic diagram of drawing an arc on a target paper using the circular pipe positioning method of the flow sensor according to an embodiment of the present invention.

[0041] Figure 3 This is a schematic diagram of drawing a first square and a second square on a target paper using the circular pipe positioning method of the flow sensor according to an embodiment of the present invention.

[0042] Figure 4 This is a schematic diagram of setting points U and D in a circular pipe using the flow sensor positioning method of this invention.

[0043] Figure 5 This is a flowchart illustrating the circular pipe positioning method for a flow sensor according to an embodiment of the present invention.

[0044] Figure 6 This is a schematic diagram of the target plate for the circular pipe positioning method of the flow sensor according to an embodiment of the present invention.

[0045] Figure 7 This is a schematic diagram of the drawing compass for the circular pipe positioning method of the flow sensor according to an embodiment of the present invention.

[0046] Figure 8 This is a schematic diagram of a theodolite mounting frame using the circular pipe positioning method of the flow sensor according to an embodiment of the present invention.

[0047] Figure label:

[0048] 1. Pipe; 2. Target plate; 3. Drawing compass; 4. Theodolite; 5. Theodolite mounting bracket; 6. Dividing point; 7. First square; 8. Second square; 9. Central axis; 10. Target paper; 11. Curve. Detailed Implementation

[0049] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0050] The following is a reference appendix. Figures 1 to 8 A method for positioning a flow sensor in a circular pipe according to an embodiment of the present invention is described.

[0051] like Figures 1 to 8 As shown, the method for positioning a flow sensor in a circular pipe according to an embodiment of the present invention includes the following steps:

[0052] S1: Set a target plate 2 inside the circular pipe 1;

[0053] S2: Multiple equally spaced points 6 are set in the cross section orthogonal to the axial direction of pipe 1, and the multiple equally spaced points 6 are arranged at equal intervals along the circumference of pipe 1.

[0054] S3: On the cross section orthogonal to the axis of pipe 1, draw arcs 11 on the target plate 2 with multiple equally divided points 6 as centers and the drawing compass 3 as the radius. Connect the intersection points of the arcs 11 to form a regular polygon, and take the center point of the regular polygon as the circle point.

[0055] S4: Set another target plate 2 along one side of the axial direction of pipe 1, repeat S2 and S3 to obtain two dots at different positions, and define the line connecting the two dots as the central axis 9 of pipe 1.

[0056] S5: Install the theodolite 4 inside pipe 1 and align the theodolite 4 with the central axis 9;

[0057] S6: Each group of flow sensors includes a transmitter and a receiver. The angle between the line connecting the transmitter and the receiver and the central axis 9 is A. Adjust the horizontal angle of the theodolite 4 to A.

[0058] S7: Adjust the vertical circle of the theodolite 4, set the vertical circle angle to B, place the upstream point facing the inner wall of pipe 1 at vertical circle angle B as point U, and place the downstream point facing the inner wall of pipe 1 at vertical circle angle B as point D. Install the transmitter and receiver at points U and D respectively.

[0059] It is understandable that, within the same horizontal plane of pipe 1, points U and D are located on opposite sides of the central axis 9, and points U and D are arranged at intervals along the front-to-back (upstream and downstream) direction of the axis of pipe 1. The transmitter (point U) is located upstream of pipe 1, and the receiver (point D) is located downstream of pipe 1.

[0060] According to an embodiment of the present invention, the circular pipe positioning method for a flow sensor determines the central axis 9 of the pipe 1 by drawing arcs using multiple equally divided points 6, which can improve the positioning accuracy of the pipe 1 axis. Furthermore, by using the above method to lay out the theodolite 4, the installation position of the flow sensor can be accurately located, which is beneficial to improving the measurement accuracy of the flow sensor.

[0061] It is understandable that, such as Figure 1 As shown, there are two target plates 2, arranged at intervals along the axial direction of pipe 1. In other words, one target plate 2 is located upstream of pipe 1, and the other target plate 2 is located downstream of pipe 1. Taking one target plate 2 as an example, a target paper 10 is provided on the target plate 2, and the thickness direction of the target paper 10 is in the same direction as the axis of pipe 1. The legs of the target plate 2 are fixed to the bottom wall of pipe 1. Starting from the bottom end of the legs of the target plate 2, multiple equally spaced points 6 are set along the circumference of the cross-section of pipe 1. An arc 11 is drawn on the target paper 10 with the length of a compass 3 as the radius, where the length of the compass 3 is approximately the same as the radius of pipe 1. The line connecting the intersection points of the arcs 11 drawn from the multiple equally spaced points 6 forms a regular polygon. At this time, the center of the regular polygon is the center point of pipe 1.

[0062] Optionally, such as Figure 2 and Figure 3 As shown, in a cross section orthogonal to the axial direction of pipe 1, with four equally spaced dividing points 6 as centers and the drawing compass 3 as the radius, draw the first arc 11 onto the target plate 2, and connect the intersection points of the four first arcs 11 to form the first square 7.

[0063] In the cross section orthogonal to the axial direction of pipe 1, with four equally spaced dividing points 6 as centers, draw a second arc 11 on the target plate 2 with the drawing compass 3 as the radius. Connect the intersection points of the four second arcs 11 to form a second square 8. It can be understood that a total of eight equally spaced dividing points 6 are drawn on the circumference of the cross section orthogonal to the axial direction of pipe 1. The eight equally spaced dividing points 6 are equally spaced on the circumference of the cross section of pipe 1.

[0064] Taking the midpoint of the line connecting the center point of the first square 7 and the center point of the second square 8 as the circle point, it can be understood that when the center point of the first square 7 and the center point of the second square 8 can also coincide, the coincidence point is the circle point of the pipe 1.

[0065] The circular pipe positioning method for the flow sensor of the present invention, by using the above method to determine the central axis 9 of the pipe 1, can make the positioning of the central axis 9 of the pipe 1 more accurate, and is simple to operate and convenient to construct.

[0066] Optionally, the circular pipe positioning method S5 for the flow sensor specifically includes the following steps:

[0067] A theodolite mounting frame 5 is welded to the bottom of the pipe 1. The theodolite mounting frame 5 is located between the two target plates 2, and the length direction of the theodolite mounting frame 5 is orthogonal to the central axis 9 of the pipe 1.

[0068] Adjust the height of the theodolite mounting bracket 5 so that the top of the theodolite mounting bracket 5 is level with the height of the central axis 9 of the pipe 1;

[0069] Install the theodolite 4 on top of the theodolite mounting bracket 5, adjust the horizontal angle of the theodolite 4 to 0° or 180°, the vertical angle of the theodolite 4 to 90°, and align the theodolite 4 with the center of the circle on the two target plates 2, thereby calibrating the theodolite 4 and avoiding the installation error of the theodolite 4 from affecting the positioning accuracy of the flow sensor.

[0070] In some embodiments, the flow sensor is an ultrasonic flow sensor, and there can be multiple groups of flow sensors, each group including a transmitter and a receiver. There can be four, five, eight, or other groups of flow sensors, and the flow sensors can be selected according to actual needs.

[0071] Optionally, such as Figure 4 As shown, there are four groups of flow sensors. The angle A between the transmitter and receiver of each group of flow sensors and the central axis 9 is 65°. The horizontal angle of the theodolite 4 is adjusted to 65°. Each group of flow sensors is arranged at intervals along the height direction of the pipe 1. It can be understood that the pipe 1 can be equipped with different numbers of flow sensors according to design requirements. The inventors of this application found through experimental research that when there are four groups of flow sensors (i.e., four-channel flow sensors), the measurement accuracy is higher when the angle A between the transmitter and receiver of each group of flow sensors and the central axis 9 is 65°.

[0072] Specifically, such as Figure 4 As shown, the flow sensor includes a first group of sensors, a second group of sensors, a third group of sensors, and a fourth group of sensors.

[0073] The vertical angle B corresponding to the first set of sensors is greater than or equal to 36° and less than or equal to 40°. For example, the vertical angle B corresponding to the first set of sensors can be 36°, 38° or 40°; thus, the points U1 and D1 are measured.

[0074] The vertical angle B corresponding to the second set of sensors is greater than or equal to 71° and less than or equal to 75°. For example, the vertical angle B corresponding to the second set of sensors can be 71°, 73° or 75°; thus, points U2 and D2 are measured.

[0075] The vertical angle B corresponding to the third set of sensors is greater than or equal to 104° and less than or equal to 108°. For example, the vertical angle B corresponding to the third set of sensors can be 104°, 106° or 108°; thus, points U3 and D3 are measured.

[0076] The vertical circle angle B corresponding to the fourth set of sensors is greater than or equal to 139° and less than or equal to 143°. For example, the vertical circle angle B corresponding to the fourth set of sensors can be 139°, 141°, or 143°. Thus, points U4 and D4 are measured.

[0077] It is understandable that by setting the vertical plate angle B to the above parameters, the inventors of this application can more accurately position the first, second, third, and fourth sets of sensors, which is beneficial to improving the measurement accuracy of the fluid in pipe 1.

[0078] Optionally, "the transmitter and receiver are installed at points U and D respectively" also includes the following steps:

[0079] A correction template is made based on the mounting holes on the sensor base. The correction template has correction holes that correspond to the mounting holes.

[0080] Place the correction template at points U and D;

[0081] The position of the mounting hole is determined by correcting the correction hole on the template so that the sensor base can be fixed to the inner wall of pipe 1 through the mounting hole;

[0082] Both the receiver and transmitter are mounted on their respective sensor bases.

[0083] Understandably, since the sensor base and the receiver (transmitter) are not installed at the same location, a correction template is needed to adjust the sensor base's installation position. The correction holes on the template can be selected according to the size of the sensor base, thereby improving the ease of sensor base installation and enhancing the positioning accuracy of the flow sensor to ensure that upstream and downstream sensors can receive effective ultrasonic signals.

[0084] In some embodiments, "mounting both the receiver and the transmitter on the corresponding sensor base" further includes the following steps:

[0085] Pre-fix the receivers and transmitters in the same group onto the corresponding sensor bases;

[0086] Use a laser pointer to calibrate receivers and transmitters in the same group (same acoustic path);

[0087] The sensor base is locked to the inner wall of pipe 1, and the receiver and transmitter are locked to their respective sensor bases. The circular pipe positioning method for the flow sensor in this embodiment of the invention further improves the installation accuracy of the receiver and transmitter by calibrating the receivers and transmitters in the same group (same acoustic path) with a laser pointer.

[0088] In some embodiments, the circular pipe positioning method for the flow sensor further includes the following step: repositioning the theodolite 4 to the placement position of the pipe 1;

[0089] Align the laser focusing point of the theodolite 4 with the center point of the probes of each receiver and transmitter in turn, and record the values ​​of the horizontal and vertical circles of the theodolite 4.

[0090] The values ​​of the horizontal and vertical discs are compared with the initial values ​​at points U and D. When the error is less than the set value, the flow sensor installation is complete. It is understood that the circular pipe positioning method for the flow sensor in this embodiment of the invention re-measures the receiver and transmitter after installation and records the data, ensuring the reliability of the receiver and transmitter installation and avoiding the problem of large installation errors affecting the measurement accuracy of the flow sensor after installation.

[0091] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0092] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0093] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0094] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0095] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0096] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A circular pipe pointing method for a flow sensor, characterized by, Includes the following steps: S1: A target plate is placed inside a circular pipe; S2: Multiple equally spaced points are provided in a cross-section orthogonal to the axial direction of the pipe, and the multiple equally spaced points are arranged at equal intervals along the circumference of the pipe; S3: On a cross section orthogonal to the axial direction of the pipe, draw arcs on the target plate with the multiple equally divided points as centers and the radius as a compass. Connect the intersection points of the arcs to form a regular polygon, and take the center point of the regular polygon as the circle point. S4: Set another target plate along one side of the axial direction of the pipe, repeat S2 and S3 to obtain two dots at different positions, and define the line connecting the two dots as the central axis of the pipe. S5: Install a theodolite inside the pipe and align the theodolite with the central axis; S6: Each set of flow sensors includes a transmitter and a receiver, and the angle between the line connecting the transmitter and the receiver and the central axis is A. Adjust the horizontal angle of the theodolite's level plate to A. S7: Adjust the vertical circle of the theodolite, set the angle of the vertical circle to B, take the upstream point facing the inner wall of the pipe as point U, and the downstream point facing the inner wall of the pipe as point D. The transmitter and the receiver are installed at points U and D respectively. S3 further includes: In a cross section orthogonal to the axial direction of the pipe, with four equally spaced dividing points as centers and the drawing compass as the radius, draw a first arc on the target plate, and connect the intersection points of the four first arcs to form a first square. In a cross section orthogonal to the axial direction of the pipe, with the other four equally spaced dividing points as centers and the drawing compass as the radius, draw a second arc on the target plate, and connect the intersection points of the four second arcs to form a second square; The midpoint of the line connecting the center point of the first square and the center point of the second square is taken as the circle point.

2. The circular pipe fixturing method of a flow sensor of claim 1, wherein, The flow sensors are arranged in four groups. The angle A between the line connecting the transmitter and the receiver of each group of flow sensors and the central axis is 65°. The horizontal angle of the theodolite's level plate is adjusted to 65°. Each group of flow sensors is arranged at intervals along the height direction of the pipeline.

3. The flow sensor circular pipe pointing method of claim 2, wherein, The flow sensor includes a first group of sensors, a second group of sensors, a third group of sensors, and a fourth group of sensors. The vertical disk angle B corresponding to the first group of sensors is greater than or equal to 36° and less than or equal to 40°; The vertical angle B corresponding to the second group of sensors is greater than or equal to 71° and less than or equal to 75°; The vertical disk angle B corresponding to the third group of sensors is greater than or equal to 104° and less than or equal to 108°. The vertical angle B corresponding to the fourth group of sensors is greater than or equal to 139° and less than or equal to 143°.

4. The flow sensor circular pipe pointing method of claim 1, wherein, "The transmitter and receiver are respectively installed at point U and point D," and the method further includes the following steps: A correction template is made according to the mounting holes on the sensor base, and the correction template is provided with correction holes corresponding to the mounting holes. Place the correction template at points U and D; The position of the mounting hole is determined by the correction hole on the correction template so that the sensor base is fixed to the inner wall of the pipe through the mounting hole; Both the receiver and the transmitter are mounted on their respective sensor bases.

5. The circular pipe fixturing method of flow sensor according to claim 4, wherein, "Mounting both the receiver and the transmitter on the corresponding sensor base" also includes the following steps: The receiver and transmitter in the same group are pre-fixed to the corresponding sensor base; The receivers and transmitters in the same group are calibrated using a laser pointer; The sensor base is locked to the inner wall of the pipe, and the receiver and the transmitter are locked to the corresponding sensor bases.

6. The flow sensor circular pipe pointing method of claim 4, wherein, It also includes the following steps: Reposition the theodolite to the location where the pipe was placed; Align the laser focusing point of the theodolite sequentially with the center points of the probes of each receiver and transmitter, and record the values ​​of the horizontal and vertical circles of the theodolite; The values ​​of the horizontal and vertical discs are compared with the initial values ​​of points U and D. When the error is less than the set value, the flow sensor installation is complete.

7. The flow sensor circular pipe pointing method of claim 1, wherein, The S5 also includes: A theodolite mounting frame is welded to the bottom of the pipe. The theodolite mounting frame is located between the two target plates, and the length direction of the theodolite mounting frame is orthogonal to the central axis of the pipe. Adjust the height of the theodolite mounting frame so that the top of the theodolite mounting frame is level with the central axis of the pipe; Install the theodolite on top of the theodolite mounting bracket, adjust the horizontal angle of the theodolite to 0° or 180°, the vertical angle of the theodolite to 90°, and align the theodolite with the center of the circle on the two target plates.

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