Sewage pipeline flow calculation method based on electromagnetic induction

Abstract

The invention belongs to the technical field of sewage pipeline flow detection, and particularly relates to a sewage pipeline flow calculation method based on electromagnetic induction, which comprises the following steps: step 1, a detection mechanism is arranged between two butt-joint flowing sewage pipelines, and the detection mechanism is composed of a measuring pipe, an electrode and an excitation coil, the magnet exciting coil wraps the outer arc surface of the measuring tube. The sewage pipeline flow calculation method based on electromagnetic induction is high in measurement precision and suitable for various conductive media including sewage, corrosive liquid and a mixture containing solid particles; the measuring range is wide, and the device is suitable for measuring fluids with different pipe diameters and flow ranges. The electromagnetic flowmeter can be quickly mounted on the sewage pipe through the quick clamping mechanism, so that the mounting time is shortened, the labor intensity is reduced, and maintenance and calibration are facilitated; measurement errors caused by fluid interference are avoided by reducing accumulation of sediments, and the accuracy of circulation measurement is further enhanced by circular motion measurement of the electrodes.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage pipe flow detection, and in particular to a sewage pipe flow calculation method based on electromagnetic induction. Background Art

[0002] Flowmeter is one of the indispensable detection instruments in industrial production and scientific research. Traditional flow measurement methods, such as turbine flowmeter, ultrasonic flowmeter, etc., have certain limitations in measurement accuracy, applicable media, installation and maintenance, etc. Electromagnetic flowmeter uses Faraday's law of electromagnetic induction to measure the flow of conductive fluids. It has the advantages of high measurement accuracy and is not affected by the physical properties of the fluid (such as temperature, pressure, viscosity, etc.). It is especially suitable for flow measurement of complex media containing solid particles, sludge, etc.; However, the current electromagnetic flowmeter uses screw thread connection in measurement. After long-term use, the screws are easy to rust and make disassembly difficult. It can only be disassembled by destructive method. In addition, since both ends need to be screwed and threaded, steps are set at both ends of the control measuring tube. When the excitation coil is damaged, it cannot be disassembled and replaced, resulting in cost waste. In addition, the electrodes in the current measurement are fixed methods. During long-term measurement work, stains will be retained on the surface, resulting in low measurement accuracy. Therefore, a sewage pipe flow calculation method based on electromagnetic induction is needed. Summary of the invention

[0003] Based on the existing technical problems, the present invention proposes a sewage pipe flow calculation method based on electromagnetic induction.

[0004] The present invention proposes a method for calculating the flow rate of a sewage pipe based on electromagnetic induction, which includes the following steps: step 1, setting a detection mechanism between two butt-connected flow pipes, the detection mechanism consisting of a measuring tube, an electrode and an excitation coil, the excitation coil is wrapped around the outer arc surface of the measuring tube, and quick clamping mechanisms are set at both ends of the measuring tube, the quick clamping mechanism includes sewage pipes sealed and connected at both ends of the measuring tube, the quick clamping mechanism realizes the action of quick sealing and installation of the two ends of the measuring tube and the corresponding two sewage pipes, and a rotating mechanism is also set inside the measuring tube, and the rotating mechanism realizes the action of rotating the electrode during measurement.

[0005] Step 2: Transmit the measured induced electromotive force signal to the converter through a shielded cable; the converter amplifies, filters and converts the signal to analog to digital to reduce noise interference and signal attenuation; the electrode forms a circular motion during the measurement, and the average electromotive force of the electrode under the circular motion needs to be calculated first. The calculation formula is:

[0006] T is the time period for the electrode to complete a complete circular motion; E(t) is the electromotive force of the electrode at each position;

[0007] The average electromotive force calculated Calculate the flow velocity V inside the measuring tube again; the calculation formula is: B is the magnetic induction intensity; L is the distance between the electrodes;

[0008] Then, the signal is calculated by a digital processor to obtain a signal proportional to the fluid flow rate; the flow rate signal is multiplied by the cross-sectional area of ​​the measuring tube to obtain the flow rate Q;

[0009] The calculation formula is: Q = V × A;

[0010] Where A is the cross-sectional area of ​​the measuring tube.

[0011] Step 3. The converter transmits the calculated flow data to the display unit; the display unit includes an LED screen for displaying instantaneous flow and cumulative flow information; it is also equipped with a data output interface, which uses a 4-20mA analog output interface and an RS485 digital communication interface to transmit the measurement data to the control system to achieve remote monitoring and data recording.

[0012] Step 4. To ensure measurement accuracy and reliability, automatic calibration and fault diagnosis functions are also set up; the automatic calibration system regularly calibrates the zero point and range; the fault diagnosis function monitors the operating status of the flow meter in real time by detecting key parameters of the electrode status and excitation current, and provides alarm prompts in abnormal situations.

[0013] Preferably, the arc surface at one end of the sewage pipe close to the measuring tube and the arc surfaces at both ends of the measuring tube are provided with clamping grooves, and the two ends of the measuring tube and the surfaces of the two correspondingly connected sewage pipes are movably connected with clamping rings, and every two of the clamping grooves are located inside one of the clamping rings.

[0014] Preferably, clamping drive cavities are provided at both ends of the clamping ring, and connecting holes are provided on the inner walls of the two clamping drive cavities. A feeding pipe is fixedly installed on the inner wall of the connecting hole, and a valve is provided on the surface of the feeding pipe. A first clamping rod is slidably inserted into the inner bottom wall of the clamping drive cavity, and one end of each of the first clamping rods is in extrusion contact with the inner bottom wall of the clamping groove.

[0015] Preferably, an extrusion piston is fixedly installed on the top of the first clamping rod, and the surrounding surfaces of the extrusion piston are slidably connected with the inner wall of the clamping drive chamber through a sealing ring. A first spring is fixedly installed on one side surface of the extrusion piston, and the bottom end of the first spring is fixedly installed on the inner wall of the clamping drive chamber, and every two of the first springs are respectively located on both sides of one of the first clamping rods.

[0016] Preferably, a driving groove is opened inside the bottom end of the first clamping rod, and the top inner wall of the driving groove is fixedly connected to the inner wall of the clamping driving cavity, and a second clamping rod is slidably inserted into the inner wall of one side of the driving groove, one end of the second clamping rod is in compression contact with the inner wall of the clamping groove, and the other end of the second clamping rod is sealed and slid with the inner wall of the driving groove through a sealing ring, and a second spring is also fixedly installed on one side of the second clamping rod, and one end of the second spring is fixedly installed on the inner wall of the driving groove, and the elastic force of the second spring is greater than the elastic force of the first spring.

[0017] Preferably, the rotating mechanism includes an electrically insulating tube installed on the arc inner wall of the measuring tube, a power groove is opened on the outer arc surface of the middle part of the electrically insulating tube, a sealing plate is installed on the top inner wall of the power groove by screws, the electrically insulating tube and the sealing plate are made of polytetrafluoroethylene, a rotating motor is also fixedly installed on the inner wall of the power groove, and a rotating shaft is fixedly installed on the output end of the rotating motor through a coupling.

[0018] Preferably, a rotation groove is provided on the inner wall of the central arc of the electrical insulation tube, one end of the rotation shaft passes through and extends into the interior of the rotation groove, and a driving gear is fixedly mounted on one end of the rotation shaft.

[0019] Preferably, an arc-shaped slide rail is fixedly installed on the arc inner wall of the rotating groove, an arc-shaped slider is slidably inserted into the inner wall of the arc-shaped slide rail, multiple arc-shaped sliders are distributed in a circular array with the arc-shaped slide rail, and rotating rings are fixedly installed on the relative surfaces of multiple arc-shaped sliders.

[0020] Preferably, sealing rings are fixedly installed on both side surfaces of the rotating ring, and the surfaces of the two sealing rings are squeezed and sealed with the inner walls on both sides of the rotating groove. The electrodes are installed on the arc inner wall of the rotating ring, and the two electrodes are symmetrically distributed. The two electrodes are driven by carbon brushes for conduction during rotation.

[0021] Preferably, a gear ring is fixedly mounted on the arc surface at one end of the top of the rotating ring, and the inner wall of the tooth groove of the gear ring is meshed with the tooth surface of the driving gear.

[0022] The beneficial effects of the present invention are:

[0023] The present invention has high measurement accuracy and is applicable to various conductive media, including sewage, corrosive liquids and mixtures containing solid particles; it has a wide measurement range and is suitable for measuring fluids with different pipe diameters and flow ranges. The quick clamping mechanism enables the electromagnetic flowmeter to be quickly installed on the sewage pipe, reducing installation time and labor intensity, facilitating maintenance and calibration, avoiding the screw thread connection method, and directly pulling out the excitation coil for replacement in later maintenance, thereby reducing costs; by reducing sediment accumulation and thus avoiding measurement errors caused by fluid interference, and by measuring the circular motion of the electrode, the accuracy of the flow measurement is further enhanced, and the influence of stains retained on the electrode surface is reduced. The reliability and measurement stability of the flowmeter can also be further improved through automatic calibration and diagnosis functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a sewage pipe flow calculation method based on electromagnetic induction;

[0025] Figure 2 A three-dimensional cross-sectional view of a sewage pipe structure for calculating a sewage pipe flow rate based on electromagnetic induction;

[0026] Figure 3 It is a three-dimensional exploded diagram of the sealing plate structure of a sewage pipe flow calculation method based on electromagnetic induction;

[0027] Figure 4 A three-dimensional diagram of the exciting coil structure of a sewage pipe flow calculation method based on electromagnetic induction;

[0028] Figure 5 A three-dimensional diagram of a clamping slot structure for a sewage pipe flow calculation method based on electromagnetic induction;

[0029] Figure 6 A three-dimensional cross-sectional view of an electrically insulating pipe structure for a sewage pipe flow calculation method based on electromagnetic induction;

[0030] Figure 7 A three-dimensional diagram of a rotating mechanism for a sewage pipe flow calculation method based on electromagnetic induction;

[0031] Figure 8 A method for calculating flow in sewage pipes based on electromagnetic induction Figure 2 A magnified view of the structure at center;

[0032] Fig. 9 A method for calculating flow in sewage pipes based on electromagnetic induction Figure 2 A magnified view of the structure at B in the middle;

[0033] Fig.10 A method for calculating flow in sewage pipes based on electromagnetic induction Figure 5A magnified view of the structure at C in the middle;

[0034] Fig.11 A method for calculating flow in sewage pipes based on electromagnetic induction Figure 6 Enlarged view of the structure at point D in the middle.

[0035] In the figure: 1. measuring tube; 2. electrode; 3. excitation coil; 4. quick clamping mechanism; 41. sewage pipe; 42. clamping groove; 43. clamping ring; 44. clamping drive chamber; 45. connecting hole; 46. feeding pipe; 47. valve; 48. first clamping rod; 49. extrusion piston; 410. first spring; 411. drive groove; 412. second clamping rod; 413. second spring; 5. rotating mechanism; 51. electrical insulating tube; 52. power groove; 53. sealing plate; 54. rotating motor; 55. rotating shaft; 56. rotating groove; 57. driving gear; 58. arc slide rail; 59. arc slide block; 510. rotating ring; 511. sealing ring; 512. gear ring. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0037] Reference Figure 1-Figure 11 A method for calculating the flow rate of a sewage pipe based on electromagnetic induction comprises the following steps: step 1, setting a detection mechanism between two butt-connected flow pipes, the detection mechanism comprising a measuring tube 1, an electrode 2 and an excitation coil 3, the excitation coil 3 is wrapped around the outer arc surface of the measuring tube 1, and quick clamping mechanisms 4 are arranged at both ends of the measuring tube 1, the quick clamping mechanism 4 comprises a sewage pipe 41 sealed and connected at both ends of the measuring tube 1, the quick clamping mechanism 4 realizes the action of quickly sealing and installing the two ends of the measuring tube 1 with the corresponding two sewage pipes 41, the quick clamping mechanism 4 comprises a sewage pipe 41 sealed and connected at both ends of the measuring tube 1, a clamping groove 42 is provided on the arc surface of one end of the sewage pipe 41 close to the measuring tube 1 and the arc surfaces at both ends of the measuring tube 1, and clamping rings 43 are movably sleeved on the surfaces of the two ends of the measuring tube 1 and the correspondingly connected two sewage pipes 41, and each two clamping grooves 42 are located inside a clamping ring 43.

[0038] Specifically implemented in this way, the quick clamping mechanism 4 allows the measuring tube 1 to be quickly connected and sealed with the sewage pipe 41, reducing installation time and labor intensity and improving work efficiency; the design of the clamping groove 42 and the clamping ring 43 makes it easy to disassemble and reinstall the measuring tube 1 and the connecting pipe, which is convenient for daily maintenance and cleaning.

[0039] A clamping drive chamber 44 is provided at both ends of the clamping ring 43, and a connecting hole 45 is provided on the inner wall of the two clamping drive chambers 44. A feeding pipe 46 is fixedly installed on the inner wall of the connecting hole 45, and a valve 47 is provided on the surface of the feeding pipe 46. A first clamping rod 48 is slidably inserted into the inner bottom wall of the clamping drive chamber 44, and one end of each of the multiple first clamping rods 48 is in extrusion contact with the inner bottom wall of the clamping groove 42.

[0040] Specifically implemented in this way, the design of the clamping drive cavity 44 and the first clamping rod 48 allows the size of the clamping ring 43 to be automatically adjusted by mechanical means, thereby achieving a quick and tight connection between the measuring tube 1 and the sewage pipe 41; multiple first clamping rods 48 can be evenly distributed around the clamping groove 42, ensuring uniform sealing between the measuring tube 1 and the connecting pipe, and reducing the risk of leakage caused by excessive local pressure.

[0041] An extrusion piston 49 is also fixedly installed on the top of the first clamping rod 48. The surrounding surfaces of the extrusion piston 49 are slidably inserted into the inner wall of the clamping drive chamber 44 through sealing rings. A first spring 410 is fixedly installed on one side surface of the extrusion piston 49. The bottom end of the first spring 410 is fixedly installed on the inner wall of the clamping drive chamber 44. Every two first springs 410 are respectively located on both sides of a first clamping rod 48.

[0042] Specifically, the oil pressure is allowed to enter the interior of the clamping drive chamber 44 through the feeding pipe 46, and the multiple first clamping rods 48 at both ends of the clamping rod are synchronously controlled to move outward to realize the clamping operation. During the operation, the extrusion piston 49 is pushed to move by the oil pressure, thereby driving the first clamping ring 43 to move outward and be squeezed on the inner wall of the clamping groove 42, and at the same time squeezing the first spring 410 so that the first spring 410 generates an extrusion force.

[0043] A driving groove 411 is opened inside the bottom end of the first clamping rod 48, and the top inner wall of the driving groove 411 is fixedly connected to the inner wall of the clamping driving cavity 44. A second clamping rod 412 is slidably inserted into the inner wall of one side of the driving groove 411. One end of the second clamping rod 412 is in squeeze contact with the inner wall of the clamping groove 42, and the other end of the second clamping rod 412 is sealed and slid with the inner wall of the driving groove 411 through a sealing ring. A second spring 413 is also fixedly installed on one side of the second clamping rod 412, and one end of the second spring 413 is fixedly installed on the inner wall of the driving groove 411. The elastic force of the second spring 413 is greater than the elastic force of the first spring 410.

[0044] Specifically, when the oil pressure enters the clamping drive chamber 44, because the elastic force of the second spring 413 is greater than the elastic force of the first spring 410, the oil pressure preferentially squeezes the first spring 410 to compress it, thereby realizing the outward extension movement of the first clamping rod 48. After the first clamping rod 48 is clamped and positioned, the oil pressure continues to increase, and the increased oil pressure drives the second spring 413 to be compressed, and the second clamping rod 412 is driven to extend outward to realize the extrusion and clamping of the end face of the measuring tube 1 and the connecting end face of the sewage pipe 41. When disassembly is required, it is only necessary to open the valve 47 to control the internal oil pressure to slowly decrease, and under the reverse thrust of the spring, the second spring 413 is controlled to first drive the second clamping rod 412 to retract and return to its original position, and then the first clamping rod 48 is controlled to retract and return to its original position through the first spring 410, thereby realizing rapid clamping and disassembly.

[0045] A rotating mechanism 5 is also provided inside the measuring tube 1 .

[0046] In order to realize the rotational motion measurement of the electrode 2 during measurement, a rotating mechanism 5 is provided, including an electrical insulating tube 51 installed on the inner wall of the arc of the measuring tube 1, a power groove 52 is opened on the outer arc surface of the middle part of the electrical insulating tube 51, and a sealing plate 53 is installed on the inner wall of the top end of the power groove 52 by screws. The electrical insulating tube 51 and the sealing plate 53 are both made of polytetrafluoroethylene. A rotating motor 54 is also fixedly installed on the inner wall of the power groove 52, and a rotating shaft 55 is fixedly installed on the output end of the rotating motor 54 through a coupling.

[0047] Specifically, by rotating the electrode 2, the measurement error caused by the uneven flow of the fluid can be reduced or eliminated; the rotation of the electrode 2 can reduce the accumulation of sediment and maintain the contact area between the electrode 2 and the fluid, thereby improving the stability of the measurement; PTFE is one of the best known electrical insulating materials and is suitable for use in the electrical insulating tube 51 and the sealing plate 53 in the electromagnetic flowmeter to ensure electrical safety and prevent the magnetic field of the excitation coil 3 from affecting the parts inside the electrical insulating tube 51.

[0048] A rotating groove 56 is formed on the inner wall of the central arc of the electrical insulating tube 51 . One end of the rotating shaft 55 passes through and extends into the rotating groove 56 . A driving gear 57 is fixedly mounted on one end of the rotating shaft 55 .

[0049] Specifically implemented in this way, the rotating groove 56 provides a fixed track to ensure that the electrode 2 maintains an accurate track when rotating, thereby improving the measurement accuracy; the fixed connection between the driving gear 57 and the rotating shaft 55 can effectively transmit the rotational power of the rotating motor 54 to the electrode 2, thereby realizing the rotation of the electrode 2.

[0050] An arc-shaped slide rail 58 is fixedly installed on the arc inner wall of the rotating groove 56, and an arc-shaped slider 59 is slidably inserted into the inner wall of the arc-shaped slide rail 58. Multiple arc-shaped sliders 59 are distributed in a circular array with the arc-shaped slide rail 58, and rotating rings 510 are fixedly installed on the relative surfaces of the multiple arc-shaped sliders 59.

[0051] Specifically implemented in this way, the arc-shaped sliders 59 are evenly distributed on the rotating ring 510, which can ensure that the force applied to the electrode 2 during rotation is uniform, thereby improving the smoothness of rotation; the design of the arc-shaped slide rail 58 and the slider reduces the jump and deviation during rotation, improves the rotation accuracy of the electrode 2, and further improves the accuracy of flow measurement.

[0052] Sealing rings 511 are fixedly installed on both side surfaces of the rotating ring 510. The surfaces of the two sealing rings 511 are squeezed and sealed with the inner walls of both sides of the rotating groove 56. The electrode 2 is installed on the arc inner wall of the rotating ring 510, and the two electrodes 2 are symmetrically distributed. The two electrodes 2 are driven by carbon brushes for conduction during the rotational motion.

[0053] Specifically implemented in this way, the design of the sealing ring 511 can effectively prevent fluid leakage and ensure the sealing performance of the rotating mechanism 5; the sealing ring 511 can also prevent the fluid from entering the interior of the rotating motor 54, protect the rotating motor 54 from fluid contamination, and extend the service life of the rotating motor 54.

[0054] A gear ring 512 is fixedly mounted on the arc surface of one end of the top of the rotating ring 510 , and the inner wall of the tooth groove of the gear ring 512 meshes with the gear tooth surface of the driving gear 57 .

[0055] Specifically implemented in this way, the meshing of the ring gear 512 and the driving gear 57 can provide a precise transmission ratio, ensuring that the rotation speed and position control of the rotating ring 510 are very accurate.

[0056] Step 2: Transmit the measured induced electromotive force signal to the converter through a shielded cable; the converter amplifies, filters and performs analog-to-digital conversion on the signal to reduce noise interference and signal attenuation; wherein, the electrode 2 forms a circular motion during the measurement, and it is necessary to first calculate the average electromotive force of the electrode 2 under the circular motion The calculation formula is:

[0057] T is the time period for electrode 2 to complete a complete circular motion; E(t) is the electromotive force of electrode 2 at each position.

[0058] The average electromotive force calculated Calculate the flow velocity V inside the measuring tube 1 again; the calculation formula is: B is the magnetic induction intensity; L is the distance between the electrodes 2.

[0059] Then, the signal is calculated by a digital processor to obtain a signal proportional to the fluid flow rate; the flow rate signal is multiplied by the cross-sectional area of ​​the measuring tube 1 to obtain the flow rate Q;

[0060] The calculation formula is: Q = V × A;

[0061] Where A is the cross-sectional area of ​​measuring tube 1.

[0062] Step 3. The converter transmits the calculated flow data to the display unit; the display unit includes an LED screen for displaying instantaneous flow and cumulative flow information; it is also equipped with a data output interface, which uses a 4-20mA analog output interface and an RS485 digital communication interface to transmit the measurement data to the control system to achieve remote monitoring and data recording.

[0063] Step 4. To ensure measurement accuracy and reliability, automatic calibration and fault diagnosis functions are also set up; the automatic calibration system regularly calibrates the zero point and range; the fault diagnosis function monitors the operating status of the flow meter in real time by detecting the key parameters of the electrode 2 status and the excitation current, and provides an alarm prompt in case of abnormality.

[0064] The present invention has high measurement accuracy and is applicable to various conductive media, including sewage, corrosive liquids and mixtures containing solid particles; it has a wide measurement range and is suitable for measuring fluids with different pipe diameters and flow ranges. The quick clamping mechanism 4 enables the electromagnetic flowmeter to be quickly installed on the sewage pipe 41, reducing installation time and labor intensity, and facilitating maintenance and calibration; it reduces sediment accumulation and thus avoids measurement errors caused by fluid interference, and the circular motion measurement of the electrode 2 further enhances the accuracy of the flow measurement, and can also further improve the reliability and measurement stability of the flowmeter through automatic calibration and diagnostic functions.

[0065] Working principle: When the measuring tube 1 and the sewage pipe 41 are installed, the clamping ring 43 is sleeved on the end faces of the measuring tube 1 and the sewage pipe 41, and the valve 47 is opened by connecting the oil pipe and the feeding pipe 46 to control the hydraulic oil to enter the inside of the clamping drive chamber 44, so that the oil pressure continues to increase, and the oil pressure is first used to control the first clamping rod 48 to squeeze the inner bottom wall of the clamping groove 42 to position it, and then control the second clamping rod 412 to squeeze the inner side wall of the clamping groove 42 to control its sealing and locking. After the installation is completed, the excitation coil 3 is energized to detect the corresponding data inside the measuring tube 1, and the flow data of the circulation is calculated using the calculation formula. During measurement, the rotating motor 54 can also be controlled to drive the rotating shaft 55 to rotate, and then drive the driving gear 57 to rotate, thereby controlling the ring gear 512 to perform circular motion, and driving the electrode 2 installed on the surface of the rotating ring 510 to perform circular rotation motion measurement operations.

[0066] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for calculating flow in a sewage pipe based on electromagnetic induction, characterized in that: The invention comprises the following steps: step 1, setting a detection mechanism between two butt-jointed flow pipes, the detection mechanism comprising a measuring tube (1), an electrode (2) and an excitation coil (3), the excitation coil (3) being wrapped around the outer arc surface of the measuring tube (1), quick clamping mechanisms (4) being provided at both ends of the measuring tube (1), the quick clamping mechanisms (4) comprising sewage pipes (41) sealed and connected at both ends of the measuring tube (1), the quick clamping mechanisms (4) realizing the action of quick sealing and installation of the two ends of the measuring tube (1) and the corresponding two sewage pipes (41), the measuring tube (1) also being provided with a rotating mechanism (5) inside, the rotating mechanism (5) realizing the action of rotating the electrode (2) during measurement; Step 2: The measured induced electromotive force signal is transmitted to the converter via a shielded cable; the converter amplifies, filters and performs analog-to-digital conversion on the signal to reduce noise interference and signal attenuation; wherein, the electrode (2) forms a circular motion during the measurement, and it is necessary to first calculate the average electromotive force of the electrode (2) under the circular motion The calculation formula is: T is the time period for the electrode (2) to complete one complete circular motion; E(t) is the electromotive force of the electrode (2) at each position; The average electromotive force calculated by Calculate the flow velocity V inside the measuring tube (1) again; the calculation formula is: B is the magnetic induction intensity; L is the distance between the electrodes (2); Then, the signal is calculated by a digital processor to obtain a signal proportional to the fluid flow rate; the flow rate signal is multiplied by the cross-sectional area of ​​the measuring tube (1) to obtain the flow rate Q; The calculation formula is: Q = V × A; Wherein, A is the cross-sectional area of ​​the measuring tube (1); Step 3: The converter transmits the calculated flow data to the display unit; the display unit includes an LED screen for displaying instantaneous flow and cumulative flow information; it is also equipped with a data output interface, which uses a 4-20mA analog output interface and an RS485 digital communication interface to transmit the measured data to the control system to achieve remote monitoring and data recording; Step 4. To ensure measurement accuracy and reliability, automatic calibration and fault diagnosis functions are also set; the automatic calibration system regularly calibrates the zero point and range; the fault diagnosis function monitors the operating status of the flow meter in real time by detecting the key parameters of the electrode (2) status and the excitation current, and provides an alarm prompt in case of abnormality.

2. The method for calculating sewage pipe flow based on electromagnetic induction according to claim 1 is characterized in that: The arc surface of one end of the sewage pipe (41) close to the measuring pipe (1) and the arc surfaces at both ends of the measuring pipe (1) are provided with clamping grooves (42); the two ends of the measuring pipe (1) and the surfaces of the two correspondingly connected sewage pipes (41) are movably sleeved with clamping rings (43); and every two of the clamping grooves (42) are located inside one of the clamping rings (43).

3. The method for calculating sewage pipe flow based on electromagnetic induction according to claim 2 is characterized in that: Both ends of the clamping ring (43) are provided with clamping drive chambers (44), and the inner walls of the two clamping drive chambers (44) are provided with connecting holes (45). A feeding pipe (46) is fixedly installed on the inner wall of the connecting hole (45), and a valve (47) is provided on the surface of the feeding pipe (46). A first clamping rod (48) is slidably inserted into the inner bottom wall of the clamping drive chamber (44), and one end of each of the first clamping rods (48) is in extrusion contact with the inner bottom wall of the clamping groove (42).

4. The method for calculating sewage pipe flow based on electromagnetic induction according to claim 3 is characterized in that: An extrusion piston (49) is also fixedly installed on the top of the first clamping rod (48), and the surrounding surfaces of the extrusion piston (49) are slidably connected to the inner wall of the clamping drive chamber (44) through a sealing ring. A first spring (410) is fixedly installed on one side surface of the extrusion piston (49), and the bottom end of the first spring (410) is fixedly installed on the inner wall of the clamping drive chamber (44), and every two of the first springs (410) are respectively located on both sides of one of the first clamping rods (48).

5. The method for calculating sewage pipe flow based on electromagnetic induction according to claim 4 is characterized in that: A driving groove (411) is provided inside the bottom end of the first clamping rod (48), and the top inner wall of the driving groove (411) is fixedly connected to the inner wall of the clamping driving cavity (44). A second clamping rod (412) is slidably inserted into the inner wall of one side of the driving groove (411), and one end of the second clamping rod (412) is in compression contact with the inner wall of the clamping groove (42), and the other end of the second clamping rod (412) is sealed and slidably connected to the inner wall of the driving groove (411) through a sealing ring. A second spring (413) is also fixedly installed on one side of the second clamping rod (412), and one end of the second spring (413) is fixedly installed on the inner wall of the driving groove (411), and the elastic force of the second spring (413) is greater than the elastic force of the first spring (410).

6. The method for calculating sewage pipe flow based on electromagnetic induction according to claim 1, characterized in that: The rotating mechanism (5) comprises an electrical insulating tube (51) mounted on the inner wall of the circular arc of the measuring tube (1); a power groove (52) is provided on the outer circular arc surface of the middle part of the electrical insulating tube (51); a sealing plate (53) is mounted on the inner wall of the top end of the power groove (52) by screws; the electrical insulating tube (51) and the sealing plate (53) are both made of polytetrafluoroethylene; a rotating motor (54) is also fixedly mounted on the inner wall of the power groove (52); and a rotating shaft (55) is fixedly mounted on the output end of the rotating motor (54) by a coupling.

7. A method for calculating sewage pipe flow based on electromagnetic induction according to claim 6, characterized in that: A rotating groove (56) is provided on the inner wall of the central arc of the electrical insulating tube (51), one end of the rotating shaft (55) passes through and extends into the interior of the rotating groove (56), and a driving gear (57) is fixedly mounted on one end of the rotating shaft (55).

8. The method for calculating flow rate in a sewage pipe based on electromagnetic induction according to claim 7 is characterized in that: An arc-shaped slide rail (58) is fixedly mounted on the arc inner wall of the rotating groove (56), an arc-shaped slider (59) is slidably inserted into the inner wall of the arc-shaped slide rail (58), a plurality of the arc-shaped sliders (59) are distributed in a circular array with the arc-shaped slide rail (58), and a rotating ring (510) is fixedly mounted on the opposite surfaces of the plurality of the arc-shaped sliders (59).

9. A method for calculating sewage pipe flow based on electromagnetic induction according to claim 8, characterized in that: Sealing rings (511) are fixedly mounted on both side surfaces of the rotating ring (510), and the surfaces of the two sealing rings (511) are squeezed and sealed with the inner walls on both sides of the rotating groove (56). The electrodes (2) are mounted on the arc inner wall of the rotating ring (510), and the two electrodes (2) are symmetrically distributed. The two electrodes (2) are driven by electric conduction through carbon brushes during the rotating motion.

10. The method for calculating flow rate in a sewage pipe based on electromagnetic induction according to claim 8, characterized in that: A gear ring (512) is fixedly mounted on the arc surface of one end of the top of the rotating ring (510), and the inner wall of the tooth groove of the gear ring (512) meshes with the gear tooth surface of the driving gear (57).

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