A flow measuring device using an electromagnetic flowmeter

Abstract

The invention discloses a flow measuring device using an electromagnetic flowmeter, which is fixed on a lead fish and includes a signal acquisition module, a signal processing module, a lithium battery and a single-chip microcomputer. The signal acquisition module includes an electromagnetic flowmeter and a lead fish signal acquisition module. The electromagnetic flowmeter is fixed on the head of the lead fish, the signal processing module is fixed on the lead fish tail of the lead fish, the lead fish signal acquisition module is fixedly connected to the signal processing module, and the lithium battery is fixed on the signal processing module; the single-chip microcomputer obtains the lead fish signal from the lead fish signal acquisition module and transmits it to the signal processing module; the signal processing module is connected to the electromagnetic flowmeter through a cable and receives the flow velocity signal sent by the electromagnetic flowmeter; the signal processing module processes the received lead fish signal and flow velocity signal, and then controls the single-chip microcomputer and finally transmits it to a hydrological cableway flow measuring system. The flow measuring device using the electromagnetic flowmeter can be directly put into water, has a wide measurement range, high data accuracy, and can be remotely controlled.

Description

Technical Field

[0001] The invention relates to the field of flowmeters for hydrological testing, and more particularly to a flow measuring device using an electromagnetic flowmeter. Background Art

[0002] At present, the country is increasing its efforts to develop hydrology and requires scientific and technological innovation. The existing technology mainly uses propeller flowmeters and cup flowmeters for hydrological testing. Propeller flowmeters and cup flowmeters are both rotor flowmeters with basically the same working principle. They use water flow power to drive the rotor to rotate, and then calculate the flow rate through K, C, and N. The flow rate calculation formula is: V = KN + C; in the formula: V-flow rate (m / s); N-number of dual audio signals; K-constant; C-instrument calibration coefficient. The existing technology that relies on this method to measure hydrological flow velocity and flow has encountered several similar problems: First, due to environmental eutrophication, aquatic plants in rivers and waterways have grown in large numbers, causing traditional flow meters (propellers, cups) to be entangled frequently, resulting in measurement interruption or inability to measure or measurement data errors; Second, there are a lot of garbage and debris in the river, which can easily cause damage to traditional flow meters (propellers, cups); Third, the K, C, and N values ​​of the flow meter need to be recalibrated after each measurement for a certain period of time, and the flow meter cannot be placed outdoors for a long time. Long-term wind rotation will quickly cause the K, C, and N values ​​to shift or become scrapped. Fourth, the measurement range of traditional flow meters is small, and there are low-speed flow meters and high-speed flow meters respectively. If the river flow range is large, two flow meters are required. Fifth, since traditional flow meters cannot be placed outdoors for a long time, each flow measurement requires manual installation of the flow meter on site, and each hydrological station needs to arrange personnel on duty, which increases labor costs and makes remote flow measurement more troublesome. At present, electromagnetic flowmeters are usually used to measure hydrological information. There are also existing technologies, but they cannot be used on lead fish and directly put into water for measurement, and the data processing and control parts are difficult to solve and effectively process. Therefore, further research is needed to address the above issues. Summary of the invention

[0003] In view of the deficiencies in the prior art, an object of the present invention is to provide a flow measuring device using an electromagnetic flowmeter, which at least solves some of the above-mentioned technical problems.

[0004] To achieve the above object, the present invention provides the following technical solution:

[0005] A flow measuring device using an electromagnetic flowmeter is fixed on a lead fish, comprising a signal acquisition module, a signal processing module, a lithium battery and a single-chip microcomputer, wherein the signal acquisition module comprises an electromagnetic flowmeter and a lead fish signal acquisition module, the electromagnetic flowmeter is fixed on the head of the lead fish, the signal processing module is fixed on the lead fish tail of the lead fish, the lead fish signal acquisition module is fixedly connected to the signal processing module, and the lithium battery is fixed on the signal processing module; the single-chip microcomputer obtains the lead fish signal from the lead fish signal acquisition module and transmits it to the signal processing module; the signal processing module is connected to the electromagnetic flowmeter through a cable and receives the flow velocity signal sent by the electromagnetic flowmeter; the signal processing module processes the received lead fish signal and flow velocity signal, controls the single-chip microcomputer, and finally transmits the received signal to a hydrological cableway flow measuring system.

[0006] Further preferably, the electromagnetic flowmeter comprises a probe, a fuselage and a flowmeter tail, the probe is provided with an excitation coil for generating a magnetic field and two electrodes symmetrically arranged on the inner wall of the probe; the fuselage is a stainless steel frame, the fuselage is provided with a preamplifier for amplifying an electric potential signal, the cable passes through a wire channel in the middle of the fuselage and is connected to the preamplifier, the excitation coil and the electrodes; the flowmeter tail is relatively fixedly connected to the probe at both ends of the fuselage, the probe is designed with a streamlined symmetrical structure, the end of the probe away from the fuselage is a water guide end, and the flowmeter tail is used to ensure that the symmetry axis of the probe is consistent with the direction of water flow in the river.

[0007] It is further preferred that: a waterproof joint is provided at the fuselage where the cable passes through, and a waterproof plug is provided at the connection between the cable and the preamplifier; a fixing hole is also provided in the middle of the fuselage, and the fixing hole fixes the electromagnetic flowmeter to the head of the lead fish, and the fixing hole is a through hole that passes through the fuselage, and the flowmeter tail wing includes a bracket and a first screw, and is fixedly connected to the fuselage through the bracket and the first screw; an auxiliary hole is provided between the wire passage of the fuselage and the fixing hole, and the auxiliary hole is sealed by a second screw and a waterproof ring, and the waterproof ring is located on the side of the auxiliary hole close to the wire passage.

[0008] It is further preferred that: the single chip microcomputer controls the lithium battery to power the electromagnetic flowmeter and the signal processing module, and monitors the voltage of the lithium battery; when the voltage of the lithium battery is lower than a preset threshold, the single chip microcomputer controls the charging of the lithium battery through the thin film solar panel.

[0009] It is further preferred that: the lead fish signal acquisition module includes a water resistance switch, a gyroscope sensor and a GPS sensor; the water resistance switch acquires the water entry signal of the lead fish and transmits it to the single-chip microcomputer; the gyroscope sensor acquires the movement signal of the lead fish and transmits it to the single-chip microcomputer; the GPS sensor acquires the horizontal displacement signal of the lead fish and transmits it to the single-chip microcomputer.

[0010] It is further preferred that: the signal processing module includes a data acquisition processing module and a dual audio signal processing module, the single-chip microcomputer receives the flow velocity signal detected by the electromagnetic flow meter, and forms a switch signal after processing by the data acquisition processing module, and then transmits it to the dual audio signal processing module; the dual audio signal processing module converts the switch signal into a dual audio signal, which is finally transmitted to the hydrological cableway flow measurement system.

[0011] It is further preferred that: when the single-chip microcomputer does not receive the signal transmitted by the water resistance switch, the gyroscope sensor and the GPS sensor, the single-chip microcomputer controls the lithium battery to stop powering the electromagnetic flowmeter and the signal processing module, and enters a sleep mode; when the single-chip microcomputer receives the signal transmitted by the water resistance switch, the gyroscope sensor or the GPS sensor, the single-chip microcomputer controls the lithium battery to start powering the electromagnetic flowmeter and the signal processing module, and enters a working mode.

[0012] It is further preferred that: the signal processing module includes a shell, a mainboard is arranged inside the shell, the mainboard is fixed to the inner side of the shell by a column head, the cable passes through the shell to connect the electromagnetic flowmeter, the signal processing module and the single-chip microcomputer; the mainboard is electrically connected to the cable, and the cable is sealed by a waterproof component at the point where it passes through the shell; the lithium battery is fixed in the shell, and the water resistance switch is fixed on the shell.

[0013] It is further preferred that: the single chip microcomputer comprises a flow measuring module, the flow measuring module receives the flow velocity signal detected by the electromagnetic flow meter, and the process of receiving the flow velocity signal also includes parameter control of the flow measuring module.

[0014] It is further preferred that: the flow measurement module includes a flow measurement control, a parameter setting control, a report storage control and an exit control; the parameter setting control is used to set the flow measurement parameters before the flow meter works, and the flow measurement parameters include one or more of system parameters, visual effect parameters, flow meter parameters, river section parameters, horizontal correction parameters, vertical correction parameters and personnel parameters; the flow measurement control is used to preset the flow measurement vertical line, flow measurement method, flow measurement time and depth measurement method after the flow measurement parameters are set; the report storage control can save the flow velocity signal collected by the flow meter, and query data according to time to generate a hydrological standard report; the exit control is used to exit the flow measurement module.

[0015] In summary, the present invention has the following beneficial effects: 1. The electromagnetic flowmeter used in the flow measuring device of the present invention has no rotating parts and uses a metal shell. It is not afraid of silt blockage and waterweed entanglement. The probe is sturdy and durable, not afraid of being hit by foreign objects, and is suitable for various river environments. 2. The electromagnetic flowmeter used in the flow measuring device of the present invention is made using Faraday's law of electromagnetic induction. The excitation coil generates an induced potential, which is collected by two electrodes. This induced potential is proportional to the flow velocity, thereby realizing the measurement of the flow velocity. The obtained flow velocity is then converted to K, C, and N values, so no calibration is required. 3. The flow measuring device of the present invention does not need to be manually installed every time the flow is measured, and the electromagnetic flowmeter will not be damaged. It uses lithium batteries for power supply and solar energy for floating charging, ensuring that the electromagnetic flowmeter can be hung on the lead fish for a long time, realizing remote flow measurement, and reducing labor costs. 4. The electromagnetic flowmeter puts the probe into the river water, and the measurement data is more accurate and the measurement range is wide. A flowmeter can achieve low-speed, medium-speed, and high-speed measurements. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a system block diagram of a flow measuring device using an electromagnetic flow meter in one embodiment of the present invention;

[0017] Figure 2 It is a block diagram of a signal processing module in a system of a flow measuring device using an electromagnetic flow meter in one embodiment of the present invention;

[0018] Figure 3 is a top view of the structure of an electromagnetic flow meter of a flow measuring device using an electromagnetic flow meter in one embodiment of the present invention;

[0019] Figure 4 It is a side view of the structure of an electromagnetic flow meter of a flow measuring device using an electromagnetic flow meter in one embodiment of the present invention;

[0020] Figure 5 It is a front view of the structure of a signal processing module 20 of a flow measuring device using an electromagnetic flow meter in one embodiment of the present invention;

[0021] Figure 6 It is a bottom view of the structure of a signal processing module 20 of a flow measuring device using an electromagnetic flow meter in one embodiment of the present invention;

[0022] Figure 7 It is a flow measurement module block diagram of a single chip microcomputer of a flow measurement device using an electromagnetic flow meter in one embodiment of the present invention;

[0023] In the figure, 10, electromagnetic flowmeter; 11, probe; 111, excitation coil; 112, electrode; 12, fuselage; 121, preamplifier; 122, fixing hole; 123, waterproof plug; 124, waterproof connector; 125, wire passage; 126, auxiliary hole; 127, waterproof ring; 128, second screw; 13, flowmeter tail; 131, bracket; 132, first screw; 20, signal processing module; 21, shell; 22, main board; 23, column head; 24, waterproof part; 30, cable; 40, lithium battery; 50, water resistance switch. DETAILED DESCRIPTION

[0024] The present invention is described in detail below in conjunction with the accompanying drawings and embodiments.

[0025] In one embodiment of the present invention, reference Figures 1 to 7, a flow measuring device using an electromagnetic flowmeter 10 is provided, which is fixed on a lead fish, and includes a signal acquisition module, a signal processing module 20, a lithium battery 40 and a single chip microcomputer. The signal acquisition module includes an electromagnetic flowmeter 10 and a lead fish signal acquisition module. The electromagnetic flowmeter 10 is fixed on the head of the lead fish, and the signal processing module 20 is fixed on the tail of the lead fish, which can effectively fix the signal processing module 20, so that they can be put into water together for signal processing. The lithium battery 40 is fixed on the signal processing module 20, which is convenient for continuous power supply during operation. The lead fish signal acquisition module is fixedly connected to the signal processing module 20; the single chip microcomputer obtains the lead fish signal from the lead fish signal acquisition module and transmits it to the signal processing module 20; the signal processing module 20 is connected to the electromagnetic flowmeter 10 through a cable 30, and receives the flow velocity signal sent by the electromagnetic flowmeter 10; the signal processing module 20 processes the received lead fish signal and flow velocity signal, and then controls the single chip microcomputer and finally transmits it to the hydrological cableway flow measurement system. The electromagnetic flowmeter is a measuring instrument that calculates the flow rate of the fluid based on the induced potential generated by the movement of the conductive fluid in the magnetic field. Its basic working principle is Faraday's law of electromagnetic induction. The intelligent electromagnetic flowmeter generates a uniform magnetic field around its probe. When water flows on both sides of the probe 11, it cuts the magnetic lines of force to generate an induced potential. This induced potential is proportional to the flow rate. The obtained flow rate signal is then converted to K, C, and N values ​​to obtain the flow rate, so no calibration is required, thereby realizing the measurement of the flow rate. The measurement signal is processed by the single-chip signal processing module 20 and then controlled by the single-chip microcomputer, which can ensure the stable operation of the entire flow measurement device, reduce labor costs, and facilitate remote operation.

[0026] Optionally: Refer again Figure 3 to Figure 4The electromagnetic flow meter 10 includes a probe 11, a body 12 and a flow meter tail 13. The probe 11 is provided with an excitation coil 111 for generating a magnetic field and two electrodes 112 symmetrically arranged on the inner wall of the probe 11; the body 12 is a stainless steel frame, and the body 12 is provided with a preamplifier 121 for amplifying an electric potential signal. The cable 30 passes through a wire passage 125 in the middle of the body 12 and is connected to the preamplifier 121, the excitation coil 111 and the electrode 112; the flow meter tail 13 is relatively fixedly connected to the two ends of the body 12 with respect to the probe 11. The probe 11 is designed with a streamlined symmetrical structure. The end of the probe 11 away from the body 12 is a water flow guide end (not shown), and the flow meter tail 13 ensures that the symmetry axis of the probe 11 is consistent with the direction of the water flow in the river. The probe 11 is made of non-magnetic material. The front of the probe 11 is the water flow guide end. The appearance adopts a streamlined design to reduce resistance. Electrodes 112 made of stainless steel are inlaid on both sides. The probe 11 is equipped with an excitation coil 111 that generates a magnetic field. The body 12 is equipped with a preamplifier 121 for processing signals. The measurement point of the electromagnetic flow meter is in the front, and no rotating parts are required. It is directly placed in the river for each measurement. It does not need to be installed manually separately, and the flow measurement data is accurate. The probe 11 and the body 12 use a metal shell and a stainless steel frame structure. It is not afraid of silt blockage and aquatic weed entanglement. The probe is sturdy and durable, not afraid of being hit by foreign objects, and is suitable for various river environments. The entire flow meter effectively completes the flow test and transmits it to the hydrological cableway flow measurement system.

[0027] Optionally: a waterproof connector 124 is provided at the place where the cable 30 passes through the fuselage 12, and a waterproof plug 123 is provided at the connection between the cable 30 and the preamplifier 121, so that the cable 30 has a good waterproof effect at every place in the wire passage 125; a fixing hole 122 is also provided in the middle of the fuselage 12, and the fixing hole 122 fixes the electromagnetic flowmeter 10 on the head of the lead fish. The fixing hole 122 is a through hole that runs through the fuselage 12, so that a good fixing effect can be achieved, ensuring that the electromagnetic flowmeter is firmly located on the head of the lead fish. The flowmeter tail 13 includes a bracket 131 and a first screw 132, and is fixedly connected to the fuselage 12 through the bracket 131 and the first screw 132; ensure that the axis of symmetry of the probe 11 is consistent with the direction of the water flow in the river for accurate measurement. An auxiliary hole 126 is provided between the wire passage 125 of the fuselage 12 and the fixing hole 122. The auxiliary hole 126 is sealed by a second screw 128 and a waterproof ring 127. The waterproof ring 127 is located on the side of the auxiliary hole 126 close to the wire passage 125. The provision of the auxiliary hole 126 can facilitate the manufacture and formation of the wire passage 125, and thus facilitate the insertion of the cable 30. The auxiliary hole 126 is filled by the second screw 128, and the waterproof ring 127 seals the gap between the second screw 128 and the auxiliary hole 126, thereby forming a good seal. In this way, the entire electromagnetic flow meter has waterproof sealing performance.

[0028] Optionally, the single chip controls the lithium battery 40 to supply power to the electromagnetic flow meter 10 and the signal processing module 20, and monitors the voltage of the lithium battery 40; when the voltage of the lithium battery 40 is lower than a preset threshold, the single chip controls the thin film solar panel to charge the lithium battery 40. This facilitates remote automatic control, saves labor costs, and ensures better system operation.

[0029] Optionally: the lead fish signal acquisition module includes a water resistance switch 50, a gyro sensor and a GPS sensor; the water resistance switch 50 acquires the water entry signal of the lead fish and transmits it to the single-chip microcomputer; the gyro sensor acquires the movement signal of the lead fish and transmits it to the single-chip microcomputer; the GPS sensor acquires the horizontal displacement signal of the lead fish and transmits it to the single-chip microcomputer. Specifically, the single-chip microcomputer in the system receives the signal of the gyro sensor, the signal of the GPS movement sensor, and the signal of the water resistance switch. Among them, the gyro sensor generates a signal when the lead fish moves, the GPS movement sensor generates a signal after the lead fish moves a certain distance, and the water resistance switch 30 generates a signal when entering the water. The single-chip microcomputer receives and processes the sensor signal and controls the power supply of the electromagnetic flowmeter 10, the data acquisition processing module, the signal dual audio processing module, and the control of its own sleep. Ensure that the lead fish uses the electromagnetic flowmeter with low power consumption and save energy.

[0030] Optionally: Refer again Figure 2 The signal processing module 20 includes a data acquisition processing module and a dual audio signal processing module 20. The single chip receives the flow velocity signal detected by the electromagnetic flow meter 10, and forms a switch signal after being processed by the data acquisition processing module, and then transmits it to the dual audio signal processing module 20; the dual audio signal processing module 20 converts the switch signal into a dual audio signal, and finally transmits it to the hydrological cableway flow measurement system. The dual audio processing module of the signal receives the flow velocity signal, which is a switch signal. The single chip and the dual audio chip are used to convert the flow velocity signal into a dual audio signal, and then the dual audio signal is sent back to the station house through the cableway to increase the anti-interference ability of the signal. Combined with the entire system, the electromagnetic flow meter enters the river to collect flow velocity data, and then sends the flow velocity data to the single chip for reception. The single chip receives the flow velocity data, and then calculates its own K, C, and N values ​​according to the traditional flow velocity calculation formula (V=KN+C) of the flow velocity meter, and converts it into a flow velocity switch signal in real time, and sends the switch signal to the dual audio processing module of the signal for further processing. According to the flow rate calculation formula: V = KN + C; in the formula: V-flow rate (m / s); N-number of dual-audio signals; K-constant; C-instrument calibration coefficient. Since K and C are fixed, the K and C values ​​of the same electromagnetic flow meter 10 are certain, and do not need to be adjusted again after setting, so accurate flow rate data can be obtained based on the number of dual-audio signals obtained.

[0031] Optionally: when the single-chip microcomputer does not receive the signal transmitted by the water resistance switch 50, the gyroscope sensor and the GPS sensor, the single-chip microcomputer controls the lithium battery 40 to stop supplying power to the electromagnetic flowmeter 10 and the signal processing module 20, and enters the sleep mode; when the single-chip microcomputer receives the signal transmitted by the water resistance switch 50, the gyroscope sensor or the GPS sensor, the single-chip microcomputer controls the lithium battery 40 to start supplying power to the electromagnetic flowmeter 10 and the signal processing module 20, and enters the working mode. When the single-chip microcomputer receives any one or more of the three signals, the single-chip microcomputer activates itself, enters the working state, and issues a control instruction to turn on the power switch of the electromagnetic flowmeter 10, the data acquisition processing module, and the signal dual audio processing module. When the single-chip microcomputer issues a control instruction after not receiving any sensor signal, it turns off the power switch of the electromagnetic flowmeter 10, the data acquisition processing module, and the signal dual audio processing module, and allows itself to enter the sleep state. Combined with the solar film charging and the structure of the electromagnetic flowmeter 10, it is ensured that the electromagnetic flowmeter 10 for lead fish is hung on the lead fish for a long time, and remote flow measurement can be achieved. The power is turned on only when current is measured, and the power system is in sleep mode at other times to save energy.

[0032] Optionally: Refer again Figures 5 and 6 The signal processing module 20 includes a housing 21, a mainboard 22 is provided inside the housing 21, and the mainboard 22 is fixed on the inner side of the housing 21 through a column head 23. The cable 30 passes through the housing 21 to connect the electromagnetic flowmeter 10, the signal processing module 20 and the single-chip microcomputer; the mainboard 22 is electrically connected to the cable 30, and the cable 30 passes through the housing 21 and is sealed by a waterproof member 24; the lithium battery 40 is fixed in the housing 21, and the water resistance switch 50 is fixed on the housing 21. The signal processing module 20 is connected to the electromagnetic flowmeter 10 through the cable 30, and obtains its flow rate signal, which is processed by the mainboard 22. The signal processing module 20 itself adopts a metal shell housing 21 structure, which has good waterproof sealing performance, and can be put into the water with the lead fish, and can ensure normal operation at the same time.

[0033] Optionally: Refer again Figure 7 The single chip microcomputer includes a flow measurement module, which receives the flow velocity signal detected by the electromagnetic flow meter 10. The process of receiving the flow velocity signal also includes parameter control of the flow measurement module. By setting parameters through the measurement module, the flow velocity signal is obtained according to the set parameters, which can be more intelligent.

[0034] Optionally: the flow measurement module includes a flow measurement control, a parameter setting control, a report storage control and an exit control; the parameter setting control is used to set the flow measurement parameters before the flow meter works, and the flow measurement parameters include one or more of system parameters, visual effect parameters, flow meter parameters, river section parameters, horizontal correction parameters, vertical correction parameters and personnel parameters; the flow measurement control is used to preset the flow measurement vertical line, flow measurement method, flow measurement time and depth measurement method after the flow measurement parameters are set; the report storage control can save the flow velocity signal collected by the flow meter, and query the data according to the time to generate a hydrological standard report; the exit control is used to exit the flow measurement module. In detail, the main interface of the flow measurement module sets four controls, namely, the flow measurement control, the parameter setting control, the report query control, and the exit software control. Before measuring the flow, click the parameter setting control to enter the parameter setting interface to set the relevant parameters of the local hydrological station, system parameters, visual effects, flow meter, river section, horizontal correction parameters, vertical correction parameters, personnel, and back up the data. Click the flow measurement control to enter the flow measurement preset interface, where you can preset the flow measurement vertical line, flow measurement method, flow measurement time, and depth measurement method. Enter the flow measurement interface to display the control controls, signal related data, and real-time display of flow measurement conditions. The single-chip microcomputer sends control instructions and receives water level instructions through the flow measurement module, and receives the flow velocity signal, lead fish position signal, etc. It can perform manual, semi-automatic, and fully automatic flow measurement for easy operation. The report storage control saves the flow measurement data. After the flow measurement is completed, enter the main interface and query the flow measurement data by clicking the report query control to generate a hydrological standard report.

[0035] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A flow measuring device using an electromagnetic flowmeter, fixed on a lead fish, characterized in that: It comprises a signal acquisition module, a signal processing module, a lithium battery and a single-chip microcomputer, wherein the signal acquisition module comprises an electromagnetic flowmeter and a lead fish signal acquisition module, the electromagnetic flowmeter is fixed on the head of the lead fish, the signal processing module is fixed on the lead fish tail of the lead fish, the lead fish signal acquisition module is fixedly connected to the signal processing module, and the lithium battery is fixed on the signal processing module; the single-chip microcomputer acquires the lead fish signal from the lead fish signal acquisition module and transmits it to the signal processing module; the signal processing module is connected to the electromagnetic flowmeter through a cable and receives the flow velocity signal sent by the electromagnetic flowmeter; the signal processing module processes the received lead fish signal and flow velocity signal, controls them through the single-chip microcomputer, and finally transmits them to the hydrological cableway flow measurement system; The signal processing module includes a data acquisition processing module and a dual-audio signal processing module. The single-chip microcomputer receives the flow velocity signal detected by the electromagnetic flow meter, and forms a switch signal after processing by the data acquisition processing module, and then transmits it to the dual-audio signal processing module; the dual-audio signal processing module converts the switch signal into a dual-audio signal, and finally transmits it to the hydrological cableway flow measurement system.

2. A flow measuring device using an electromagnetic flowmeter according to claim 1, characterized in that: The electromagnetic flow meter includes a probe, a fuselage and a flow meter tail. The probe is provided with an excitation coil for generating a magnetic field and two electrodes symmetrically arranged on the inner wall of the probe. The fuselage is a stainless steel frame. A preamplifier for amplifying an electric potential signal is provided in the fuselage. The cable passes through a wire passage in the middle of the fuselage and is connected to the preamplifier, the excitation coil and the electrodes. The flow meter tail is relatively fixedly connected to the probe at both ends of the fuselage. The probe is designed with a streamlined symmetrical structure. The end of the probe away from the fuselage is a water guide end. The flow meter tail is used to ensure that the symmetry axis of the probe is consistent with the direction of water flow in the river.

3. A flow measuring device using an electromagnetic flowmeter according to claim 2, characterized in that: A waterproof joint is provided at the fuselage where the cable is inserted, and a waterproof plug is provided at the connection between the cable and the preamplifier; a fixing hole is also provided in the middle of the fuselage, and the fixing hole fixes the electromagnetic flow meter to the head of the lead fish, and the fixing hole is a through hole that passes through the fuselage, and the flow meter tail wing includes a bracket and a first screw, and is fixedly connected to the fuselage through the bracket and the first screw; an auxiliary hole is provided between the wire passage of the fuselage and the fixing hole, and the auxiliary hole is sealed by a second screw and a waterproof ring, and the waterproof ring is located on the side of the auxiliary hole close to the wire passage.

4. A flow measuring device using an electromagnetic flowmeter according to claim 1, characterized in that: The single chip microcomputer controls the lithium battery to power the electromagnetic flow meter and the signal processing module, and monitors the voltage of the lithium battery; when the voltage of the lithium battery is lower than a preset threshold, the single chip microcomputer controls the charging of the lithium battery through the thin film solar panel.

5. A flow measuring device using an electromagnetic flow meter according to any one of claims 1 to 4, characterized in that: The lead fish signal acquisition module includes a water resistance switch, a gyroscope sensor and a GPS sensor; the water resistance switch acquires the water entry signal of the lead fish and transmits it to the single-chip microcomputer; the gyroscope sensor acquires the movement signal of the lead fish and transmits it to the single-chip microcomputer; the GPS sensor acquires the horizontal displacement signal of the lead fish and transmits it to the single-chip microcomputer.

6. A flow measuring device using an electromagnetic flow meter according to claim 5, characterized in that: When the single-chip microcomputer does not receive the signal transmitted by the water resistance switch, the gyroscope sensor and the GPS sensor, the single-chip microcomputer controls the lithium battery to stop supplying power to the electromagnetic flowmeter and the signal processing module, and enters the sleep mode; when the single-chip microcomputer receives the signal transmitted by the water resistance switch, the gyroscope sensor or the GPS sensor, the single-chip microcomputer controls the lithium battery to start supplying power to the electromagnetic flowmeter and the signal processing module, and enters the working mode.

7. A flow measuring device using an electromagnetic flow meter according to claim 5, characterized in that: The signal processing module includes a shell, a mainboard is arranged inside the shell, the mainboard is fixed to the inner side of the shell by a column head, the cable passes through the shell to connect the electromagnetic flowmeter, the signal processing module and the single-chip microcomputer; the mainboard is electrically connected to the cable, and the cable is sealed by a waterproof component at the point where it passes through the shell; the lithium battery is fixed in the shell, and the water resistance switch is fixed on the shell.

8. The flow measuring device using an electromagnetic flow meter according to claim 1, characterized in that: The single chip microcomputer comprises a flow measuring module, and the flow measuring module receives the flow velocity signal detected by the electromagnetic flow meter. The process of receiving the flow velocity signal also includes parameter control of the flow measuring module.

9. A flow measuring device using an electromagnetic flow meter according to claim 8, characterized in that: The flow measurement module includes a flow measurement control, a parameter setting control, a report storage control and an exit control; the parameter setting control is used to set the flow measurement parameters before the flow meter works, and the flow measurement parameters include one or more of system parameters, visual effect parameters, flow meter parameters, river section parameters, horizontal correction parameters, vertical correction parameters and personnel parameters; the flow measurement control is used to preset the flow measurement vertical line, flow measurement method, flow measurement time and depth measurement method after the flow measurement parameters are set; the report storage control can save the flow velocity signal collected by the flow meter, and query data according to time to generate a hydrological standard report; the exit control is used to exit the flow measurement module.

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