A partially filled pipe electromagnetic flowmeter for sewage flow measurement

Abstract

The present invention provides a partially filled electromagnetic flowmeter for measuring sewage flow, comprising a conduit, electrodes, and an electrode cleaning device, one for each electrode. The electrode cleaning device comprises a push rod movably mounted on the conduit, a telescopic drive mechanism for driving the cleaning end of the push rod toward or away from the electrode, and a rotary drive mechanism for driving the push rod to rotate and clean the electrode. The mud level detection device comprises a sensor probe disposed in a fluid flow area on the inner wall of the conduit. The sensor probes are evenly distributed along the circumference of the conduit and detect the conductivity of corresponding locations through each of the sensor probes. The mud level location is determined based on changes in the conductivity of each location. This solves the technical problem in the prior art of silt affecting electrode sewage flow measurement and silt level monitoring.

Description

Technical Field

[0001] The invention relates to the technical field of electromagnetic flowmeters, in particular to a non-full pipe electromagnetic flowmeter for sewage flow measurement. Background Art

[0002] With the rapid economic and social development of my country, the discharge of industrial and municipal wastewater has also increased significantly. Currently, my country has become one of the countries with the largest and fastest-growing wastewater discharge volumes in the world. Strengthening wastewater discharge monitoring is a key measure to address environmental issues. Currently, many urban drainage networks consist of partially filled underground pipes, which are gravity-fed pipes, making monitoring extremely difficult. Traditional Doppler ultrasonic flowmeters use contact measurement, so silt and impurities in sewage can easily obstruct the sensor, causing device failure. Traditional Parshall flume open channel flowmeters have limited self-cleaning capabilities. The inclination of the flume section within the flow channel easily leads to silt accumulation, which, over time, affects flow measurement accuracy. While traditional mass-volume rotor flowmeters can provide adequate sewage flow measurement accuracy, various impurities in sewage can clog the measuring instrument, resulting in frequent blockages in practical applications. Regular manual desilting is required, resulting in high maintenance costs.

[0003] Generally speaking, the main challenges with current sewage metering include: high pollutant concentrations and impurities in sewage, which creates sludge that is difficult to monitor, making it difficult to maintain and clean sewage flow meters and labor-intensive to manually clear silt. Furthermore, silt can obstruct the electrodes of pipe network sewage flow meters, leading to inaccurate measurements. Therefore, the market urgently needs an instrument and device that can effectively prevent silt from affecting sewage flow measurement while also simultaneously monitoring silt deposition. Summary of the Invention

[0004] 1. Technical Problems Solved

[0005] In view of the shortcomings of the existing technology, the present invention provides a non-full pipe electromagnetic flowmeter for sewage flow measurement, which solves the technical problems in the existing technology of silt affecting electrode sewage flow measurement and silt level monitoring.

[0006] 2. Technical Solution

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A partially filled electromagnetic flowmeter for sewage flow measurement comprises a conduit for fluid circulation, and an electrode disposed in the conduit and for inducing electromotive force. The key feature of the electromagnetic flowmeter is that it also comprises:

[0009] An electrode cleaning device, each electrode correspondingly provided with one electrode cleaning device, comprising a push rod movably inserted into the conduit, a telescopic drive mechanism for driving the cleaning end of the push rod toward or away from the electrode, and a rotary drive mechanism for driving the push rod to rotate and clean the electrode;

[0010] A mud level detection device includes at least two groups of sensor strips, each of which is arranged in the fluid flow area of ​​the inner wall of the catheter. The sensor strips include multiple sensor probes evenly distributed circumferentially along the inner wall of the catheter. By obtaining the conductivity between adjacent sensor probes, a pair of sensor probes corresponding to a larger change in conductivity is screened out, and the position of the pair of sensor probes is used as the mud level interface.

[0011] Optionally, the electrode cleaning device further includes a connector, which includes:

[0012] a housing having an inner cavity, said housing being connected to said telescopic drive mechanism;

[0013] An upper plate body, the upper plate body is arranged in the inner cavity of the shell, and a rolling element is provided between the upper plate body and the shell body so as to rotate relative to each other;

[0014] A lower seat body is provided in the inner cavity of the shell, a rolling element is provided between the lower seat body and the shell, and the lower seat body and the shell rotate relative to each other, the lower seat body is arranged opposite to the upper plate body, and a rotating shaft is provided in the middle of the lower seat body, the rotating shaft passes through the shell and is coaxially connected to the push rod;

[0015] An elastic member is arranged between the upper plate and the lower seat, and the two ends of the elastic member respectively abut the upper plate and the lower seat with the corresponding inner walls of the shell, and rolling members are evenly provided between the upper plate and the lower seat and the corresponding inner walls of the shell.

[0016] Optionally, a guide mechanism is provided between the upper plate and the lower seat for guiding the relative displacement between the upper plate and the lower seat;

[0017] The guide mechanism includes a guide column axially arranged on the upper plate body and a guide sleeve axially arranged on the lower seat body. The lower seat body has a through hole coaxial with the guide sleeve. The guide column is movably inserted into the guide sleeve and the through hole and is clearance-fitted.

[0018] Optionally, the telescopic drive mechanism includes a first drive motor, a screw that rotates synchronously with the output shaft of the first drive motor, and a threaded sleeve threadedly connected to the screw, the screw is parallel to the push rod, and the threaded sleeve is connected to the connecting head through a connecting rod and moves synchronously.

[0019] Optionally, the rotation drive mechanism includes a second drive motor, a driving gear connected to the second drive motor, a driven gear connected to the push rod, and a belt gear meshing with the driving gear and the driven gear, and the push rod is connected to the center hole of the driven gear via a spline.

[0020] Optionally, the electrode cleaning device further includes a mounting seat;

[0021] The mounting seat includes a first mounting portion for mounting the rotation drive mechanism and a second mounting portion for mounting the telescopic drive mechanism, wherein the first mounting portion and the second mounting portion are respectively provided with a first inner cavity and a second inner cavity;

[0022] The driving gear, driven gear and belt gear are all arranged in the first inner cavity;

[0023] The second inner cavity is arranged to extend in parallel with the axial direction of the push rod, and a strip-shaped hole is opened on the side wall of the second mounting portion for circumferentially limiting and axially guiding the connecting rod.

[0024] Optionally, a sealing member for sealing an edge of the sensing probe is provided between the sensing probe and the inner wall of the catheter, and the sealing member is connected to the inner wall of the catheter.

[0025] Optionally, the spacings between adjacent sensing probes in the sensing strips of the same group are equal.

[0026] Optionally, each of the sensing probes is connected to a corresponding connecting rod, which is movably arranged in the wall of the conduit, with a first end of the connecting rod connected to the corresponding sensing probe, and a second end of the connecting rod passing through the outer wall of the conduit and electrically connected to the circuit board assembly;

[0027] The second end of the connecting rod is connected to a tensioning member, which tensions the connecting rod toward the outside of the catheter and tightly connects the corresponding sensing probe with the sealing member.

[0028] Optionally, the tensioning member is a compression spring sleeved on the connecting rod, one end of the compression spring abuts against the limit block at the second end of the connecting rod, and the other end of the compression spring abuts against the outer wall of the conduit.

[0029] 3. Beneficial Effects

[0030] 1. The cleaning end of the push rod of the electrode cleaning device can be moved closer to or away from the electrode under the push of the telescopic drive mechanism. When the telescopic drive mechanism contacts the electrode, the rotary drive mechanism drives the push rod to rotate, and the cleaning end of the push rod brushes away the silt on the surface of the electrode, effectively preventing the accumulation of silt in the sewage from affecting the electrode's detection of the sewage flow rate.

[0031] 2. The mud level detection device can detect the conductivity of different locations through sensor probes. Since the conductivity of different media is different, when adjacent pairs of probes are in the same medium, the conductivity values ​​are relatively close, and when two adjacent probes are in different media, the relative conductivity values ​​will change significantly. When two adjacent probes are in another medium, the difference in conductivity values ​​will continue to expand. By comparing these conductivity signals, the pair of sensor probes corresponding to the change in conductivity can be found, and the position of the pair of sensor probes represents the dividing point between mud and water, that is, the mud level location, thereby achieving accurate detection of the mud level.

[0032] 3. The electrode cleaning device can be automatically operated and cleaned regularly or irregularly. The electrode cleaning device can also process the mud level detection feedback information according to the mud level detection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic structural diagram of a partially full-pipe electromagnetic flowmeter for sewage flow measurement according to the present invention;

[0034] Figure 2 for Figure 1 Left view of;

[0035] Figure 3 for Figure 1 Middle AA section view;

[0036] Figure 4 It is a structural schematic diagram of the electrode cleaning device;

[0037] Figure 5 for Figure 4 Schematic diagram of the structure of the middle connector;

[0038] Figure 6 It is a structural diagram of the mud level detection device;

[0039] Figure 7 for Figure 3 Enlarged view of middle B;

[0040] Wherein: 1-conduit; 2-converter; 3-liquid level device; 21-ground electrode; 22-first electrode; 23-second electrode; 4-electrode cleaning device; 41-push rod; 411-cleaning brush head; 42-telescopic drive mechanism; 421-first drive motor; 422-screw; 423-threaded sleeve; 424-connecting rod; 425-strip hole; 43-rotating drive mechanism; 431-second drive motor; 432-driving gear; 433-driven gear; 44-connecting Head; 441-shell; 442-upper plate; 443-lower seat; 444-elastic member; 445-rolling member; 446-guide column; 447-guide sleeve; 448-rotating shaft; 45-mounting seat; 451-first mounting portion; 452-second mounting portion; 45a-first inner cavity; 45b-second inner cavity; 5-mud level detection device; 51-sensor probe; 52-seal; 53-connecting rod; 54-tensioning member; 55-sensor housing; 56-circuit board assembly. DETAILED DESCRIPTION

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0042] Unless otherwise specified, all raw materials in the present invention can be purchased from the market, and the equipment used in the present invention can adopt conventional equipment in the relevant field or refer to the existing technology in the relevant field.

[0043] Figure 1 The figure is a schematic structural diagram of a partially full-pipe electromagnetic flowmeter for sewage flow measurement according to an exemplary embodiment of the present invention.

[0044] Please see the attached Figure 1 As shown: A partially full-pipe electromagnetic flowmeter for sewage flow measurement, comprising a conduit 1 for fluid circulation, electrodes arranged in the conduit 1 and used to induce electromotive force, a magnetic circuit system for forming a uniform magnetic field, a converter 2 for amplifying the induced electromotive force signal between the electrodes, and a liquid level device 3 for measuring the liquid level in the conduit 1.

[0045] Please see the attached Figure 2As shown, the electrodes include a ground electrode 21, a first electrode 22, and a second electrode 23. The ground electrode 21 is used to remove static electricity inside the conduit 1 to prevent drift during signal acquisition. The first electrode 22 corresponds to the second electrode 23, and the two electrodes form a relatively closed magnetic field. In actual applications, the conduit 1 will be connected to a sewage pipe. The sewage will flow into the conduit 1 along the pipe, passing through the first electrode 22, the second electrode 23, and then through the ground electrode 21. During this process, when the sewage flows through the uniform magnetic field formed by the magnetic circuit system, it will cut the magnetic flux lines. According to Faraday's law of electromagnetic induction, a potential difference will appear between the first electrode 22 and the second electrode 23. The liquid level device 3 can use an ultrasonic sensor to measure the liquid level height in the conduit 1. Because the interior of the conduit 1 is a regularly shaped pipe, when the fluid level is constant, the cross-sectional area of ​​the fluid can be calculated by combining the liquid level height with a corresponding numerical calculation model. When the cross-sectional area of ​​the fluid cutting the magnetic flux lines in the magnetic field is constant, the potential difference between the first electrode 22 and the second electrode 23 will have a certain corresponding relationship with the flow velocity of the fluid, thereby obtaining the flow velocity of the fluid. After solving the numerical model, the flow rate of the fluid flowing through the conduit 1 can be calculated.

[0046] Please see the attached Figure 1 and 2 As shown in Figure 3 , in order to clean the sludge on each electrode, the electrode A, the first electrode 22, and the second electrode 23 are each provided with an electrode cleaning device 4, which is provided outside the conduit 1. In order to monitor the sludge level in the conduit 1, a mud level detection device 5 is also provided.

[0047] Please see the attached Figure 4 As shown, the electrode cleaning device 4 includes a push rod 41 movably mounted on the conduit 1, a telescopic drive mechanism 42 for driving the cleaning end of the push rod 41 toward or away from the electrode, and a rotational drive mechanism 43 for driving the push rod 41 to rotate and clean the electrode. The cleaning end of the push rod 41 is located in the conduit 1 and is provided with a cleaning brush head 411.

[0048] Please refer to Appendix 4 and Figure 5As shown: In detail, the electrode cleaning device 4 also includes a connector 44 connected between the push rod 41 and the telescopic drive mechanism 42. The connector 44 includes a shell 441, an upper plate 442, a lower seat 443 and an elastic member 444. The shell 441 has an inner cavity, and the shell 441 is connected to the telescopic drive mechanism 42; the upper plate 442 is arranged in the inner cavity of the shell 441, and a rolling element is provided between the upper plate 442 and the shell 441 and they rotate relative to each other; the lower seat 443 is arranged in the inner cavity of the shell 441, and a rolling element 445 is provided between the lower seat 443 and the shell 441 and they rotate relative to each other, and the lower seat 443 is arranged opposite to the upper plate 442. A rotating shaft 448 is provided in the middle of the lower seat body 443, and the rotating shaft 448 passes through the shell 441 and is coaxially connected to the push rod 41; the elastic member 444 is provided between the upper plate body 442 and the lower seat body 443, and the two ends of the elastic member 444 respectively abut the upper plate body 442 and the lower seat body 443 with the corresponding inner walls of the shell 441, and rolling members 445 are evenly provided between the upper plate body 442 and the lower seat body 443 and the corresponding inner walls of the shell 441. A guide mechanism is provided between the upper plate body 442 and the lower seat body 443 for guiding the relative displacement between the upper plate body 442 and the lower seat body 443; the guide mechanism includes a guide column 446 axially provided on the upper plate body 442 and a guide sleeve 447 axially provided on the lower seat body 443; the lower seat body 443 is provided with a through hole coaxial with the guide sleeve 447, and the guide column 446 is movably inserted into the guide sleeve 447 and the through hole and is clearance-fitted.

[0049] Please refer to Appendix 4: Since the push rod 41 needs to both rotate and extend, the connector 44 can effectively connect the two, ensuring that rotation and extension do not interfere with each other and can operate simultaneously. The upper plate 442 and the lower seat 443 rotate relative to the housing 441, achieving relative rotation between the push rod 41 and the housing 441. The housing 441 is connected to the telescopic drive mechanism 42 for synchronous movement, which can push the push rod 41 to move synchronously. When the push rod 41 contacts and cleans the electrode, it receives an axial force. The elastic member 444 provided between the upper plate 442 and the lower seat 443 can act as a buffer to prevent the cleaning brush head of the push rod 41 from hard contact with the electrode and damage to the electrode. It can also protect the connecting rod and the housing 441. The guide mechanism can also play a guiding role, ensuring that the force on the lower seat 443 and the upper plate 442 is evenly distributed.

[0050] Please refer to Appendix 4 for details. The telescopic drive mechanism 42 includes a first drive motor 421, a screw 422 that rotates synchronously with the output shaft of the first drive motor 421, and a threaded sleeve 423 threadedly connected to the screw 422. The screw 422 is parallel to the push rod 41, and the threaded sleeve 423 is connected to the connector 44 via a connecting rod 424 for synchronous movement. The rotation drive mechanism 43 includes a second drive motor 431, a driving gear 432 connected to the second drive motor 431, a driven gear 433 connected to the push rod 41, and a belt gear 434 that meshes with the driving gear 432 and the driven gear 433. The driven gear 433 has a keyway in its center hole, and the outer wall of the push rod 41 is provided with key teeth. The push rod 41 is splined to the center hole of the driven gear 433, enabling the push rod 41 to move axially relative to the driven gear 433 and to rotate synchronously with the driven gear 433.

[0051] Please refer to Appendix 4 for details. The electrode cleaning device 4 also includes a mounting base 45, through which the push rod 41, telescopic drive mechanism 42, and rotational drive mechanism 43 are positioned and mounted. The mounting base 45 includes a first mounting portion 451 for mounting the rotational drive mechanism 43 and a second mounting portion 452 for mounting the telescopic drive mechanism 42. The first mounting portion 451 and the second mounting portion 452 respectively define a first inner cavity 45a and a second inner cavity 45b. The driving gear 432, the driven gear 433, and the belt gear 434 are all disposed within the first inner cavity 45a. The second inner cavity 45b extends parallel to the axial direction of the push rod 41. The sidewall of the second mounting portion 452 defines a strip-shaped hole 425 for circumferentially limiting and axially guiding the connecting rod 424. The first and second inner cavities 45a, 45b protect the internal structural components from dust. The surface where the mounting seat 45 is connected to the conduit 1 is the mounting surface. The shape of the mounting surface adapts to the surface shape of the conduit 1 and fits tightly and securely. The mounting seat 45 and the conduit 1 can be fixed by bolt locking or welding.

[0052] Please refer to Appendix 4: When there is a lot of silt in the conduit 1, the electrode needs to be cleaned to ensure accurate flow meter measurement. The electrode cleaning device 4 for the grounding electrode 21 is used as an example for explanation. The push rod 41 is normally in a retracted standby state. When the electrode needs to be cleaned, the first drive motor 421 drives the screw 422 to rotate, causing the threaded sleeve 423 to rotate relative to the screw 422. The threaded sleeve 423 moves axially along the screw 422. The threaded sleeve 423 connects to the connector 44 and drives the connector 44 to move. The connector 44 pushes the push rod 41 axially, and the cleaning brush head 411 of the push rod 41 approaches the grounding electrode 21. When the cleaning brush head 411 covers the ground electrode 21, or before it does so, the second drive motor 431 begins to drive the belt gear 434, which in turn causes the driven gear 433 to rotate. The driven gear 433 rotates synchronously with the push rod 41, causing the cleaning brush head 411 of the push rod 41 to contact the ground electrode 21 and rotate to clean the silt on the ground electrode 21. After cleaning is completed, the second drive motor 431 stops, the first drive motor 421 rotates in the opposite direction, and the push rod 41 begins to move away from the ground electrode 21 until the push rod 41 returns to the retracted standby state.

[0053] Please refer to Appendix 2: Furthermore, since the first electrode 22 and the second electrode 23 are symmetrically positioned, the electrode cleaning devices 4 corresponding to the first and second electrodes 22, 23 are generally also symmetrically positioned. Therefore, cleaning operations for the first and second electrodes 22, 23 must be performed separately. Cleaning operations for one electrode can only begin after cleaning is completed and the push rod 41 is retracted. Of course, as an example, the electrode cleaning devices 4 corresponding to the first and second electrodes 22, 23 may also be staggered, as long as the push rods 41 are directed toward the corresponding electrodes and do not interfere with each other.

[0054] The electrode cleaning device 4 can be operated regularly or irregularly to clean the electrode. The electrode cleaning device 4 can also be controlled to clean the electrode according to the mud level detected by the mud level detection device 5 .

[0055] Please refer to Appendixes 3 and 6 : The mud level detection device 5 includes a sensing probe 51 located in the fluid flow area of ​​the inner wall of the conduit 1, and a seal 52 located between the sensing probe 51 and the inner wall of the conduit 1 and used to seal the edge of the sensing probe 51. The seal 52 is connected to the inner wall of the conduit 1. The sensing probes 51 are symmetrically distributed in the fluid flow area of ​​the inner wall of the conduit. The sensing probes 51 are evenly distributed along the circumference of the conduit 1, and each sensing probe 51 detects the conductivity of a corresponding location. The mud level is determined based on the change in conductivity at each location.

[0056] Please refer to Appendix 6 for details. The spacing between adjacent sensor probes 51 in the same sensor strip is equal. The sensor probes 51 in each sensor strip group are arranged one after another to facilitate comprehensive detection and reduce errors. The sensor probes 51 in each sensor strip group can also be staggered to complement each other and improve the accuracy of mud level detection.

[0057] As shown in Appendixes 6 and 7 , each sensing probe 51 is connected to a corresponding connecting rod 53, which is movably inserted into the wall of the conduit 1. The first end of each connecting rod 53 is connected to the corresponding sensing probe 51, while the second end of each connecting rod 53 extends beyond the outer wall of the conduit 1 and is connected to a circuit board assembly 56. The second end of each connecting rod 53 is connected to a tensioning member 54, which pulls the connecting rod 53 toward the outside of the conduit 1 and securely connects the corresponding sensing probe 51 to the sealing member 52. The tensioning member 54 can be a compression spring sleeved around the connecting rod 53, one end of which abuts a stopper at the second end of the connecting rod 53, while the other end abuts the outer wall of the conduit 1. The sealing members 52 within a group of sensing strips are connected together to form a continuous sealing strip. Alternatively, the sealing members 52 of each group of sensing strips can be connected together to form a single, integrated sealing strip. Any suitable method is recommended, as long as installation is convenient and sealing is guaranteed.

[0058] By applying voltage to adjacent sensor probes 51 in the same sensor strip, the conductivity between adjacent sensor probes 51 can be measured. Different media have different conductivity levels. Starting with the two sensor probes at the bottom, the strips are symmetrically spread out on both sides. In each sensor strip, voltage is applied to only one pair of adjacent sensor probes at a time, and the test is conducted from the inside out. This results in multiple sets of conductivity signals. When each pair of sensor probes 51 is in the same medium, the conductivity values ​​are relatively close. However, when the two sensor probes 51 in each pair are in different media, the conductivity values ​​vary significantly. When both sensor probes in each pair are in different media, the difference in conductivity values ​​continues to widen. By comparing these conductivity signals, the sensor probe 51 corresponding to the change in conductivity can be found. The position of this sensor probe 51 represents the boundary between mud and liquid, thereby achieving mud level measurement.

[0059] The plurality of sensor strips are tested synchronously, and the test results of each sensor strip are integrated to reduce the error of mud level detection.

[0060] In addition, illustratively, a sensor housing 55 can be provided on the outer wall of the conduit 1, and the protruding section of the connecting rod 53 and the tension member 54 are both located in the sensor housing 55. A circuit board assembly 56 can be provided in the sensor housing 55. The connecting rod 53 is electrically connected to the circuit board assembly 56. The impedance signal / conductivity signal between adjacent sensor probes 51 of the same sensor strip will first be amplified by the amplifier circuit in the circuit board assembly 56. The amplified circuit will be filtered by the filter circuit to filter out unnecessary impurity signal interference, and finally enter the capacitive coupling circuit of the circuit board assembly 56. After rectification, it will be transmitted to the outside or connected to the converter 2, and finally transmitted to the CPU in the form of a digital signal, which will be stored in the register by the CPU. In this way, the acquisition of a group of signals is completed. After the signal acquisition is completed, the CPU, under the control of the software running program, will compare the collected signals and match them with the corresponding sensor probes 51, and finally complete the detection of the mud level signal under the operation of the software program.

[0061] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0062] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A partially filled electromagnetic flowmeter for measuring sewage flow, comprising a conduit for fluid circulation, and electrodes disposed in the conduit for inducing electromotive force, characterized in that: Also includes: An electrode cleaning device, each electrode correspondingly provided with one electrode cleaning device, comprising a push rod movably inserted into the conduit, a telescopic drive mechanism for driving the cleaning end of the push rod toward or away from the electrode, and a rotary drive mechanism for driving the push rod to rotate and clean the electrode; A mud level detection device, comprising at least two sets of sensor strips disposed in a fluid flow area on the inner wall of the conduit, the sensor strips comprising a plurality of sensor probes uniformly distributed circumferentially along the inner wall of the conduit. The device measures the electrical conductivity between adjacent sensor probes, selecting a pair of sensor probes corresponding to a significant change in electrical conductivity, and determining the position of the pair of sensor probes as a mud level interface. A sealing member for sealing the edge of the sensing probe is provided between the sensing probe and the inner wall of the catheter, and the sealing member is connected to the inner wall of the catheter; Each of the sensing probes is connected to a connecting rod, which is movably arranged in the wall of the conduit, with a first end of the connecting rod connected to the corresponding sensing probe, and a second end of the connecting rod passing through the outer wall of the conduit and electrically connected to the circuit board assembly; The second end of the connecting rod is connected to a tensioning member, which tensions the connecting rod toward the outside of the catheter and tightly connects the corresponding sensing probe with the sealing member.

2. The partially full pipe electromagnetic flowmeter for sewage flow measurement according to claim 1, characterized in that: The electrode cleaning device further includes a connector, which includes: a housing having an inner cavity, said housing being connected to said telescopic drive mechanism; an upper plate body, the upper plate body being arranged in the inner cavity of the shell, and a rolling element being provided between the upper plate body and the shell body so as to rotate relative to each other; A lower seat body is provided in the inner cavity of the shell, a rolling element is provided between the lower seat body and the shell, and the lower seat body and the shell rotate relative to each other, the lower seat body is arranged opposite to the upper plate body, and a rotating shaft is provided in the middle of the lower seat body, the rotating shaft passes through the shell and is coaxially connected to the push rod; An elastic member is arranged between the upper plate and the lower seat, and the two ends of the elastic member respectively abut the upper plate and the lower seat with the corresponding inner walls of the shell, and rolling members are evenly provided between the upper plate and the lower seat and the corresponding inner walls of the shell.

3. The partially full pipe electromagnetic flowmeter for sewage flow measurement according to claim 2, characterized in that: A guide mechanism is provided between the upper plate and the lower seat for guiding the relative displacement between the upper plate and the lower seat; The guide mechanism includes a guide column axially arranged on the upper plate body and a guide sleeve axially arranged on the lower seat body. The lower seat body has a through hole coaxial with the guide sleeve. The guide column is movably inserted into the guide sleeve and the through hole and is clearance-fitted.

4. The partially full pipe electromagnetic flowmeter for sewage flow measurement according to claim 2, characterized in that: The telescopic drive mechanism includes a first drive motor, a screw that rotates synchronously with the output shaft of the first drive motor, and a threaded sleeve threadedly connected to the screw. The screw is parallel to the push rod, and the threaded sleeve is connected to the connector through a connecting rod and moves synchronously.

5. The partially full pipe electromagnetic flowmeter for sewage flow measurement according to claim 4, characterized in that: The rotary drive mechanism includes a second drive motor, a driving gear connected to the second drive motor, a driven gear connected to the push rod, and a belt gear meshing with the driving gear and the driven gear. The push rod is connected to the center hole of the driven gear through a spline.

6. The partially full pipe electromagnetic flowmeter for sewage flow measurement according to claim 5, characterized in that: The electrode cleaning device also includes a mounting seat; The mounting seat includes a first mounting portion for mounting the rotation drive mechanism and a second mounting portion for mounting the telescopic drive mechanism, wherein the first mounting portion and the second mounting portion are respectively provided with a first inner cavity and a second inner cavity; The driving gear, driven gear and belt gear are all arranged in the first inner cavity; The second inner cavity is arranged to extend in parallel with the axial direction of the push rod, and a strip-shaped hole is opened on the side wall of the second mounting portion for circumferentially limiting and axially guiding the connecting rod.

7. The partially full pipe electromagnetic flowmeter for sewage flow measurement according to claim 1, characterized in that: The distances between adjacent sensing probes in the sensing strips of the same group are equal.

8. The partially full pipe electromagnetic flowmeter for sewage flow measurement according to claim 1, characterized in that: The tensioning member is a compression spring sleeved on the connecting rod, one end of the compression spring abuts against the limit block at the second end of the connecting rod, and the other end of the compression spring abuts against the outer wall of the conduit.

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