A float-double-pull-wire type liquid level and flow rate online monitoring device

Abstract

The invention discloses a float-double-pull-wire type liquid level and flow rate online monitoring device, which relates to the technical field of drainage pipeline liquid level and flow rate monitoring equipment, and comprises: two frames, which are symmetrically installed on the inner wall of an inspection well; a first main box and a second main box, which are respectively arranged in the two frames, a central processing unit and a communication module are arranged in the first main box, and cables are arranged in the second main box; a first pull-wire displacement sensor and a second pull-wire displacement sensor are respectively arranged on the lower sides of the first main box and the second main box, the first pull-wire displacement sensor is electrically connected to the central processing unit, and the second pull-wire displacement sensor is electrically connected to the central processing unit through a cable; a float, both ends of which are connected to the first pull-wire displacement sensor and the second pull-wire displacement sensor through a first pull-wire and a second pull-wire respectively; the device is easy to use and has accurate measurement, and can realize real-time monitoring of the liquid level and flow rate in a drainage pipeline.

Description

Technical Field

[0001] The present invention belongs to the technical field of drainage pipeline liquid level and flow rate monitoring equipment, and more specifically, relates to a float-double-pull-wire type liquid level and flow rate online monitoring device. Background Art

[0002] The internal environment of the drainage pipe is harsh, and the liquid flow conditions are changeable. There are relatively strict requirements for the use of pipeline flow meters, mainly including: strong anti-interference ability, which must be able to resist the interference of impurities in the liquid; the drainage pipe space is small, and the main places available for installation are various wells. The liquid level flow meter has low requirements for installation space and is easy to fix; the cost of use is low and can be popularized on a large scale. In addition to the price of the equipment itself, the installation cost and subsequent maintenance cost must also be considered; remote data transmission and real-time online monitoring can be performed. Considering the above requirements, the existing flow meters currently have various defects that cannot meet the use requirements. For example: rotor flow meters are prone to garbage hanging when in use; Doppler flow meters have strong waterproof and anti-fouling capabilities, but the cost is high and cannot be popularized on a large scale. Summary of the invention

[0003] The purpose of the present invention is to provide a float-double-pull-wire type liquid level and flow rate online monitoring device to address the deficiencies in the prior art. The float is connected to two pull-wire displacement sensors via pull ropes at both ends. The liquid level and flow rate in the drainage pipe are calculated based on the pull rope length readings measured by the two pull rope displacement sensors and the geometric relationship between the pull ropes. The device is easy to use and saves costs.

[0004] In order to achieve the above object, the present invention provides a float-double-pull-wire type liquid level and flow rate online monitoring device, comprising:

[0005] Two frames are symmetrically installed on the inner wall of the inspection well;

[0006] A first mainframe box and a second mainframe box are respectively arranged in the two frames, wherein a central processing unit and a communication module are arranged in the first mainframe box, and cables are arranged in the second mainframe box;

[0007] A first pull-wire displacement sensor and a second pull-wire displacement sensor are respectively arranged at the lower sides of the first mainframe box and the second mainframe box, the first pull-wire displacement sensor is electrically connected to the central processing unit, and the second pull-wire displacement sensor is electrically connected to the central processing unit through a cable;

[0008] The two ends of the floating ball are connected to the first pull rope displacement sensor and the second pull rope displacement sensor through the first pull rope and the second pull rope respectively.

[0009] Optionally, wall-hanging screws are provided on the rear sides of the two frames.

[0010] Optionally, fixed pulleys are provided on the inner side of the frame below the first pull-rope displacement sensor and the second pull-rope displacement sensor, and the first pull rope and the second pull rope pass around the fixed pulley and are connected between the float and the first pull-rope displacement sensor and the second pull-rope displacement sensor.

[0011] Optionally, the first main box and the second main box are both sealed and waterproof boxes.

[0012] Optionally, the central processing unit is a single chip microcomputer unit.

[0013] Optionally, the communication module is communicatively connected to a remote terminal.

[0014] Optionally, the communication module is a 4G module, and the remote terminal is a remote PC.

[0015] Optionally, the frame is made of aluminum profile.

[0016] Optionally, rope fixing nuts are symmetrically arranged at both ends of the float, the float is an elliptical hollow sphere, and the depth of the portion of the float submerged below the liquid surface is 1 / 3 to 1 / 2 of the diameter of the float.

[0017] Optionally, the first main chassis also includes a power supply assembly, a zeroing switch and an electromagnetic relay interrupt switch, the zeroing switch is electrically connected to the power supply assembly and the central processing unit, and the electromagnetic relay interrupt switch is electrically connected to the power supply assembly and the central processing unit.

[0018] The present invention provides a float-double-pull-wire type liquid level and flow rate online monitoring device, which has the following beneficial effects: it has two pull-wire displacement sensors, which are respectively connected to two ends of a float through pull ropes, and the two pull-wire displacement sensors are pulled by the position change of the float on the liquid surface, and then the liquid level and flow rate of the liquid in the drainage pipe are calculated by the pull-wire length readings measured by the two pull-wire displacement sensors and the geometric relationship between the pull ropes. It is easy to use and has accurate measurement; it has a communication module, which can transmit the monitoring results to a remote terminal in real time to realize remote monitoring. The device has a simple structure, is easy to install, and saves costs.

[0019] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present invention.

[0021] Figure 1A schematic structural diagram of a float-double-pull-wire type liquid level and flow velocity online monitoring device according to an embodiment of the present invention is shown.

[0022] Figure 2 The figure shows an installation diagram of a float-double-pull-wire type liquid level and flow velocity online monitoring device according to an embodiment of the present invention.

[0023] Figure 3 A schematic diagram of the electrical control of a float-double-pull-wire type liquid level and flow velocity online monitoring device according to an embodiment of the present invention is shown.

[0024] Figure 4 The overall circuit diagram of a float-double-pull-wire type liquid level and flow velocity online monitoring device according to an embodiment of the present invention is shown.

[0025] Description of reference numerals:

[0026] 1. Frame; 2. Inspection well; 3. First mainframe; 4. Second mainframe; 5. CPU; 6. Communication module; 7. Cable; 8. First pull-rope displacement sensor; 9. Second pull-rope displacement sensor; 10. Float; 11. First pull-rope; 12. Second pull-rope; 13. Wall screw; 14. Fixed pulley; 15. MCU unit; 16. Remote terminal; 17. 4G module; 18. Remote PC terminal; 19. Fixing nut; 20. Power supply assembly; 21. Zero switch; 22. Electromagnetic relay interrupt switch; 23. Power supply; 24. Power switch; 25. Multi-way power distribution board; 26. Voltage divider module; 27. Electromagnetic relay; 28. First step-down module; 29. ​​Second step-down module; 30. RS232 to TTL module; 31. Female terminal; 32. GND1 female terminal; 33. First row of female; 34. Second row of female; 35. Third row of female; 36. Fourth row of female; 37. GND2 female terminal; 38. First resistor; 39. Second resistor. DETAILED DESCRIPTION

[0027] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0028] The present invention provides a float ball-double pull-wire type liquid level and flow velocity online monitoring device, comprising:

[0029] Two frames are symmetrically installed on the inner wall of the inspection well;

[0030] A first mainframe box and a second mainframe box are respectively arranged in the two frames, wherein a central processing unit and a communication module are arranged in the first mainframe box, and cables are arranged in the second mainframe box;

[0031] A first pull-wire displacement sensor and a second pull-wire displacement sensor are respectively arranged at the lower sides of the first mainframe box and the second mainframe box, the first pull-wire displacement sensor is electrically connected to the central processing unit, and the second pull-wire displacement sensor is electrically connected to the central processing unit through a cable;

[0032] The two ends of the floating ball are connected to the first pull rope displacement sensor and the second pull rope displacement sensor through the first pull rope and the second pull rope respectively.

[0033] Specifically, the cable is provided with a redundant part in the second main box so that it can be suitable for inspection wells of different sizes. A sealing ring is provided on the outside of the cable, and the sealing ring is detachably connected to the second main box. The float floats on the liquid surface in the drainage pipe to be tested, and moves up and down with the rise and fall of the liquid level. The first pull rope and the second pull rope pull the first pull rope displacement sensor and the second pull rope displacement sensor. The first pull rope displacement sensor and the second pull rope displacement sensor measure the extended length of the pull rope in real time, and transmit the data signal to the central processing unit. The central processing unit can calculate the liquid level and flow rate of the liquid in the drainage pipe according to the pull rope length and the geometric relationship, and transmit the monitoring result to the remote terminal through the communication module for easy reception.

[0034] In one example, wall-hanging screws are provided on the rear sides of the two frames.

[0035] Specifically, the provision of wall-mounted screws facilitates the fixing and disassembly of the device in the inspection well.

[0036] In one example, fixed pulleys are provided on the inner side of the frame below the first pull rope displacement sensor and the second pull rope displacement sensor, and the first pull rope and the second pull rope are connected between the float and the first pull rope displacement sensor and the second pull rope displacement sensor by passing around the fixed pulley.

[0037] Specifically, the setting of the fixed pulley guides the pull rope, while reducing friction and improving monitoring accuracy.

[0038] In one example, the first host box and the second host box are both sealed and waterproof boxes.

[0039] Specifically, the first main chassis and the second main chassis protect the internal components thereof.

[0040] In one example, the central processing unit is a single chip microcomputer unit.

[0041] In one example, the communication module is communicatively connected to a remote terminal.

[0042] In one example, the communication module is a 4G module, and the remote terminal is a remote PC.

[0043] In one example, the frame is made of aluminum profile.

[0044] In one example, rope fixing nuts are symmetrically arranged at both ends of the float, the float is an elliptical hollow sphere, and the depth of the portion of the float submerged below the liquid surface is 1 / 3 to 1 / 2 of the diameter of the float.

[0045] Specifically, the first pull rope and the second pull rope at both ends of the float can be conveniently connected and removed through the cooperation of the screw and the fixing nut.

[0046] In other examples, the float can also be a hollow sphere or a hollow sphere with a cone at the tail. Regardless of whether the float is a hollow sphere or a hollow sphere with a cone at the tail, the depth of the part of the float submerged below the liquid surface does not exceed 1 / 2 of the diameter of the float, which can prevent floating objects or garbage on the liquid surface from hanging on the float and affecting the monitoring accuracy.

[0047] In one example, the first main chassis also includes a power supply component, a zeroing switch and an electromagnetic relay interrupt switch, the zeroing switch is electrically connected to the power supply component and the central processing unit, and the electromagnetic relay interrupt switch is electrically connected to the power supply component and the central processing unit.

[0048] Example

[0049] like Figures 1 to 4 As shown, the present invention provides a float-double-pull-wire type liquid level and flow rate online monitoring device, comprising:

[0050] Two frames 1 are symmetrically mounted on the inner wall of the inspection well 2;

[0051] The first mainframe box 3 and the second mainframe box 4 are respectively arranged in the two frames 1, the first mainframe box 3 is provided with a central processing unit 5 and a communication module 6, and the second mainframe box 4 is provided with a cable 7;

[0052] A first pull-wire displacement sensor 8 and a second pull-wire displacement sensor 9 are respectively arranged at the lower sides of the first mainframe box 3 and the second mainframe box 4. The first pull-wire displacement sensor 8 is electrically connected to the central processing unit 5, and the second pull-wire displacement sensor 9 is electrically connected to the central processing unit 5 through a cable 7.

[0053] The two ends of the floating ball 10 are connected to the first pull rope displacement sensor 8 and the second pull rope displacement sensor 9 through a first pull rope 11 and a second pull rope 12 respectively.

[0054] In this embodiment, wall-hanging screws 13 are provided on the rear sides of the two frames 1 .

[0055] In this embodiment, a fixed pulley 14 is provided on the inner side of the frame 1 below the first pull rope displacement sensor 8 and the second pull rope displacement sensor 9, and the first pull rope 11 and the second pull rope 12 pass around the fixed pulley 14 and are connected between the float 10 and the first pull rope displacement sensor 8 and the second pull rope displacement sensor 9.

[0056] In this embodiment, the first mainframe box 3 and the second mainframe box 4 are both sealed and waterproof boxes.

[0057] In this embodiment, the central processing unit 5 is a single chip microcomputer unit 15 .

[0058] In this embodiment, the communication module 6 is communicatively connected to a remote terminal 16 .

[0059] In this embodiment, the communication module 6 is a 4G module 17 , and the remote terminal 16 is a remote PC terminal 18 .

[0060] In this embodiment, the frame 1 is made of aluminum profile.

[0061] In this embodiment, rope fixing nuts 19 are symmetrically provided at both ends of the float 10 . The float 10 is an elliptical hollow sphere, and the depth of the portion of the float 10 submerged below the liquid surface is 1 / 3 to 1 / 2 of the diameter of the float 10 .

[0062] In this embodiment, the first main box 3 also includes a power supply component 20, a zeroing switch 21 and an electromagnetic relay interrupt switch 22, the zeroing switch 21 is electrically connected to the power supply component 20 and the central processing unit 5, and the electromagnetic relay interrupt switch 22 is electrically connected to the power supply component 20 and the central processing unit 5.

[0063] In this embodiment, the main chassis also includes: a power supply 23, a power switch 24, a multi-way power distribution board 25, a voltage divider module 26, an electromagnetic relay 27, a first step-down module 28, a second step-down module 29, an RS232 to TTL module 30, a female terminal 31, a GND1 female terminal 32, a first female terminal 33, a second female terminal 34, a third female terminal 35, a fourth female terminal 36, a GND2 female terminal 37, a first resistor 38 and a second resistor 39.

[0064] The positive pole of the power supply 23 is connected to the power switch 24, the power switch 24 is connected to the positive pole of the multi-way power distribution board 25, and the negative pole of the power supply 23 is connected to the negative pole of the multi-way power distribution board 25, which is used to supply power to the entire circuit control system.

[0065] The multi-way power distribution board 25 is divided into 5 wirings, the first VCC terminal is connected to the positive pole of the voltage divider module 26, and the GND terminal is connected to the negative pole of the voltage divider module 26; the second VCC terminal is connected to the positive input terminal of the first step-down module 28, and the GND terminal is connected to the negative input terminal of the first step-down module 28; the third VCC terminal is connected to the positive input terminal of the second step-down module 29, and the GND terminal is connected to the negative input terminal of the second step-down module 29; the fourth VCC terminal is connected to the positive pole of the 4G module 17, and the GND terminal is connected to the negative pole of the 4G module 17; the fifth VCC terminal is connected to the female terminal 31, and the GND terminal is connected to the female terminal 37 of GND2; multiple equal voltage power supplies can be obtained.

[0066] The OUT terminal of the voltage divider module 26 is connected to the A3 port of the single-chip unit 15, and the GND terminal is connected to the GND1 female terminal 32. It is used to monitor the remaining power of the power supply 23

[0067] The OUT+ terminal of the first step-down module 28 is connected to the positive power supply of the single-chip unit 15 , and the OUT- terminal is connected to the negative power supply of the single-chip unit 15 , so that the 12V power supply is used to supply power to the single-chip unit 15 .

[0068] The output of the second step-down module 29 is divided into four paths, the OUT+ of the first path is connected to the VCC terminal of the electromagnetic relay 27, and the OUT- is connected to the GND terminal of the electromagnetic relay 27; the OUT+ of the second path is connected to the VCC terminal of the RS232 to TTL module 30, and the OUT- is connected to the GND terminal of the RS232 to TTL module 30; the OUT+ of the third path is connected to the positive pole of the electromagnetic relay interrupt switch 22; the OUT+ of the fourth path is connected to the positive pole of the zeroing switch 21; a 5V power supply can be obtained to power the electromagnetic relay 27, the electromagnetic relay interrupt switch 22, the zeroing switch 21 and the RS232 to TTL module 30.

[0069] The normally open end and common end output of the electromagnetic relay 27 are two in total, the first common end is connected to the female end 31, and the normally open end is connected to the VCC end of the first pull-wire displacement sensor 8; the second common end is connected to the female end 31, and the normally open end is connected to the VCC end of the second pull-wire displacement sensor 9; the IN1 end of the electromagnetic relay 27 is connected to the port No. 8 of the single-chip unit 15, and the IN2 end of the electromagnetic relay 27 is connected to the port No. 9 of the single-chip unit 15; it is used to control the power on and off of the first pull-wire displacement sensor 8 and the second pull-wire displacement sensor 9 to save power.

[0070] The TX port of the RS232 to TTL module 30 is connected to the TX0 port of the single-chip unit 15 , the RX port of the RS232 to TTL module 30 is connected to the RX0 port of the single-chip unit 15 , the VCC port of the RS232 to TTL module 30 is connected to the OUT+ end of the second step-down module 29 , and the GND port of the RS232 to TTL module 30 is connected to the OUT- end of the second step-down module 29 .

[0071] The OUT terminal of the first pull-wire displacement sensor 8 is connected to the A1 port of the single-chip unit 15, and the GND terminal is connected to the GND2 female terminal 37, so as to realize the conversion of the liquid level and flow rate through the length of the pull-wire outlet.

[0072] The OUT terminal of the second pull-wire displacement sensor 9 is connected to the A2 port of the single-chip unit 15, and the GND terminal is connected to the GND2 female terminal 37, so as to realize the conversion of the liquid level and flow rate through the length of the pull-wire outlet.

[0073] The positive terminal of the zeroing switch 21 is connected to the OUT+ terminal of the second step-down module 29, and the negative terminal is connected to the first row of mother boards 33; the installation position cannot be guaranteed to be the same each time, and the zeroing switch 21 can set the measured data to zero at any position.

[0074] The positive terminal of the electromagnetic relay interrupter switch 22 is connected to the OUT+ terminal of the second step-down module 29 , and the negative terminal is connected to the fourth female row 36 ; it is used to control the on and off of the electromagnetic relay 27 .

[0075] The first row of mother outputs two paths, one path is connected to port 3 of the single chip unit 15 , and the other path is connected to the first resistor 38 .

[0076] The fourth row of mother outputs two paths, one path is connected to port 2 of the single chip unit 15 , and the other path is connected to the second resistor 39 .

[0077] The output of the second row of female terminals 34 is connected to the GND1 row of female terminals 32 .

[0078] The output of the third row of female terminals 35 is connected to the GND1 row of female terminals 32 .

[0079] The female end 32 of the GND1 row is connected to the GND port of the single chip computer unit 15 .

[0080] To summarize, when the float-double-pull-wire type liquid level and flow rate online monitoring device provided by the present invention is used, the device is symmetrically fixed on the inner wall of the inspection well 2 through the wall-hanging screws 13 at the upper ends of the two frames 1, and the second pull-wire displacement sensor 9 is electrically connected to the single-chip computer unit 15 through the cable 7.

[0081] Liquid level measurement process: Press the power switch 24 to start the monitoring device, manually pull the float 10 to the bottom of the drainage pipe, press the zero switch 21 to reset the current data of the two pull rope displacement sensors to zero. Release the float 10 so that the float 10 floats on the liquid surface. The liquid level rises, and the float 10 in the water moves upward with the liquid level. The extension length of the first pull rope 11 and the second pull rope 12 connected to the float 10 decreases. The analog signals of the first pull rope displacement sensor 8 and the second pull rope displacement sensor 9 are input into the single chip unit 15. Through the relationship between the liquid level height and the length of the two pull ropes X=0.5[(L1 2 -L2 2 ) / (W-180)+W-180], H=H'-L+h, h is the depth of immersion of the float 10, H is the liquid level, L1 is the real-time reading of the first pull-wire displacement sensor 8, L2 is the real-time reading of the second pull-wire displacement sensor 9, W is the distance between the outlets of the two pull-wire displacement sensors, H' is the distance between the outlets of the two pull-wire displacement sensors and the bottom of the drainage pipe, and the real-time output liquid level is converted in the single-chip unit 15. The liquid level data is uploaded to the cloud through the unique ID address of the 4G module 17, and the 4G module 17 creates a virtual serial port. The remote PC 18 monitors the height of the liquid level in the drainage pipe online in real time by reading the virtual serial port.

[0082] Flow rate measurement process: press the power switch 24, manually pull the float 10 to the bottom of the drainage pipe, press the zero switch 21, and reset the current data of the two pull-rope displacement sensors to zero; release the float 10 so that the float 10 floats on the liquid surface. When the liquid in the drainage pipe flows, the float 10 is acted upon by the thrust of the liquid flow and moves in the direction of the flow rate. The extension lengths of the first pull rope 11 and the second pull rope 12 connected to the float 10 will change. The analog signals of the first pull rope displacement sensor 8 and the second pull rope displacement sensor 9 are input to the single-chip microcomputer unit 15. The thrust received by the float 10 is balanced with the horizontal component of the force on the two pull ropes. The thrust received by the float 10 is first calculated through conversion by the single-chip microcomputer unit 15. F is the thrust on the float 10, L1 is the real-time reading of the first pull-wire displacement sensor 8, L2 is the real-time reading of the second pull-wire displacement sensor 9, and then according to the relationship between thrust and flow velocity, F=0.5Cρv 2 A, C are dimensionless resistance coefficients, v is the liquid flow rate, A is the flow area of ​​the float 10, ρ is the fluid density, and the output flow rate is converted in the single-chip unit 15. The flow rate data is uploaded to the cloud through the unique ID address of the 4G module 17, and the 4G module 17 creates a virtual serial port. The remote PC terminal 18 monitors the flow rate of the liquid in the drainage pipe in real time online by reading the virtual serial port.

[0083] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A float-double-pull-wire type liquid level and flow rate online monitoring device, characterized in that: The device includes: Two frames are symmetrically installed on the inner wall of the inspection well; A first mainframe box and a second mainframe box are respectively arranged in the two frames, wherein a central processing unit and a communication module are arranged in the first mainframe box, and cables are arranged in the second mainframe box; A first pull-wire displacement sensor and a second pull-wire displacement sensor are respectively arranged at the lower sides of the first mainframe box and the second mainframe box, the first pull-wire displacement sensor is electrically connected to the central processing unit, and the second pull-wire displacement sensor is electrically connected to the central processing unit through a cable; The floating ball has two ends connected to the first pull rope displacement sensor and the second pull rope displacement sensor through a first pull rope and a second pull rope respectively; A fixed pulley is provided on the inner side of the frame below the first pull rope displacement sensor and the second pull rope displacement sensor, and the first pull rope and the second pull rope pass around the fixed pulley and are connected between the floating ball and the first pull rope displacement sensor and the second pull rope displacement sensor; During the liquid level measurement process, the float is released to make it float on the liquid surface. When the liquid level rises, the float in the water moves upward with the liquid level, and the extension lengths of the first and second pull ropes connected to the float decrease. The analog signals of the first and second pull rope displacement sensors are input into the central processor, and the relationship between the liquid level height and the lengths of the two pull ropes is used to calculate the displacement of the first and second pull ropes. ,L= , , h is the depth of the float immersed, H is the liquid level height, L1 is the real-time reading of the first pull-wire displacement sensor, L2 is the real-time reading of the second pull-wire displacement sensor, W is the distance between the outlets of the two pull-wire displacement sensors, H' is the distance between the outlets of the two pull-wire displacement sensors and the bottom of the drainage pipe, and the real-time output liquid level height is converted in the central processor; When the liquid in the drainage pipe flows, the float is acted upon by the thrust of the liquid flow and moves in the direction of the flow velocity. The extension lengths of the first and second pull ropes connected to the float will change. The analog signals of the first and second pull rope displacement sensors are input to the central processor. The thrust of the float is balanced with the horizontal force of the two pull ropes. The thrust of the float is calculated by the central processor. , F is the thrust on the float, L1 is the real-time reading of the first pull-rope displacement sensor, L2 is the real-time reading of the second pull-rope displacement sensor, and then through the relationship between thrust and flow rate , C is the dimensionless resistance coefficient, v is the liquid flow rate, A is the flow area of ​​the float, ρ is the fluid density, and the output flow rate is converted in the central processing unit.

2. A float-double-pull-wire type liquid level and flow velocity online monitoring device according to claim 1, characterized in that: The rear sides of the two frames are both provided with wall-hanging screws.

3. The float-double-pull-wire type liquid level and flow velocity online monitoring device according to claim 1 is characterized in that: The first main box and the second main box are both sealed and waterproof boxes.

4. The float-double-pull-wire type liquid level and flow velocity online monitoring device according to claim 1 is characterized in that: The central processing unit is a single chip microcomputer unit.

5. The float-double-pull-wire type liquid level and flow velocity online monitoring device according to claim 1 is characterized in that: The communication module is communicatively connected to a remote terminal.

6. A float-double-pull-wire type liquid level and flow velocity online monitoring device according to claim 5, characterized in that: The communication module is a 4G module, and the remote terminal is a remote PC terminal.

7. The float-double-pull-wire type liquid level and flow velocity online monitoring device according to claim 1 is characterized in that: The material of the frame is aluminum profile.

8. The float-double-pull-wire type liquid level and flow velocity online monitoring device according to claim 1 is characterized in that: The two ends of the float are symmetrically provided with pull rope fixing nuts. The float is an elliptical hollow sphere. The depth of the part of the float submerged below the liquid surface is 1 / 3 to 1 / 2 of the diameter of the float.

9. The float-double-pull-wire type liquid level and flow velocity online monitoring device according to claim 1, characterized in that: The first main chassis also includes a power supply component, a zeroing switch and an electromagnetic relay interrupt switch. The zeroing switch is electrically connected to the power supply component and the central processing unit, and the electromagnetic relay interrupt switch is electrically connected to the power supply component and the central processing unit.

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