阅读说明：本技术 一种浮球-平行杆式液位流速在线检测装置 (Floating ball-parallel rod type liquid level and flow rate online detection device ) 是由 李思辰 周明连 董红 王增义 于丽昕 杨超 王欢欢 徐克举 赵东方 闫睿 关萍 于 2019-12-24 设计创作，主要内容包括：本发明提出了一种浮球-平行杆式液位流速在线检测装置,该装置包括：控制电路,所述控制电路包括处理单元和通信单元；转角传感器和力传感器,分别与所述处理单元通信连接,将获取的信号数据发送至所述处理单元进行计算,计算结果通过通信单元发出；平行杆机构和浮球,所述平行杆机构通过转角传感器连接到固定座安装板,所述浮球通过力传感器连接到所述平行杆机构。本发明的浮球-平行杆式液位流速在线检测装置可以进行远程数据传输,实时在线监测,而且安装简便,安装及维护成本低。(The invention provides a floating ball-parallel rod type liquid level and flow rate online detection device, which comprises: a control circuit comprising a processing unit and a communication unit; the corner sensor and the force sensor are respectively in communication connection with the processing unit, the acquired signal data are sent to the processing unit for calculation, and the calculation result is sent out through the communication unit; the device comprises a parallel rod mechanism and a floating ball, wherein the parallel rod mechanism is connected to a fixed seat mounting plate through a corner sensor, and the floating ball is connected to the parallel rod mechanism through a force sensor. The floating ball-parallel rod type liquid level flow velocity online detection device can be used for remote data transmission and real-time online monitoring, and is simple and convenient to install and low in installation and maintenance cost.)

1. The utility model provides a floater-parallel rod formula liquid level velocity of flow on-line measuring device which characterized in that, the device includes:

a control circuit comprising a processing unit and a communication unit;

the corner sensor and the force sensor are respectively in communication connection with the processing unit, the acquired signal data are sent to the processing unit for calculation, and the calculation result is sent out through the communication unit;

the device comprises a parallel rod mechanism and a floating ball, wherein the parallel rod mechanism is connected to a fixed seat mounting plate through a corner sensor, and the floating ball is connected to the parallel rod mechanism through a force sensor.

2. The floating ball-parallel rod type liquid level and flow rate online detection device as claimed in claim 1, wherein the parallel rod mechanism comprises a first connecting rod, a second connecting rod and a vertical rod, one end of the first connecting rod and one end of the second connecting rod are pivotally connected to the fixed seat mounting plate, and the other end of the first connecting rod and the other end of the second connecting rod are pivotally connected to the vertical rod.

3. The floating ball-parallel rod type liquid level and flow rate online detection device according to claim 2, wherein the parallel rod mechanism further comprises:

the first fixing seat and the second fixing seat are fixedly arranged on the fixing seat mounting plate;

the first pin shaft is arranged in the second fixed seat in a matching way;

one end of the first connecting rod is matched with a rotating shaft of the corner sensor and installed in the first fixing seat, and one end of the second connecting rod is matched with the first pin shaft and installed in the second fixing seat.

4. The floating ball-parallel rod type liquid level and flow rate online detection device as claimed in claim 3, wherein the rotation angle sensor comprises an encoder and a rotating shaft, the encoder outputs an electrical signal to mark a rotation angle when the rotating shaft rotates;

and a rotating shaft of the rotation angle sensor penetrates through the end through hole of the first connecting rod and is connected to the first connecting rod.

5. The floating ball-parallel rod type liquid level and flow rate online detection device according to claim 2, wherein the parallel rod mechanism further comprises:

the first connecting plate, the second pin shaft and the third pin shaft are arranged on the first connecting plate;

the first connecting plate and the second connecting plate are respectively arranged at the other ends of the first connecting rod and the second connecting rod and are connected to the vertical rod through a second pin shaft and a third pin shaft, so that the first connecting rod and the second connecting rod can rotate relative to the vertical rod around the second pin shaft and the third pin shaft.

6. The floating ball-parallel rod type online liquid level and flow rate detection device according to claim 2, wherein the parallel rod mechanism further comprises a floating ball connecting rod, a second unequal angle steel and a fourth pin;

the second unequal angle steel is connected to the lower end of the vertical rod through a fourth pin shaft pivot;

the floating ball is connected to the second unequal angle steel through a floating ball connecting rod.

7. The floating ball-parallel rod type online liquid level and flow rate detection device as claimed in claim 6, wherein the parallel rod mechanism further comprises a first inequilateral angle steel connected to the vertical rod, one end of the force sensor is fixed to the first inequilateral angle steel, and the second inequilateral angle steel abuts against the other end of the force sensor when rotating around a fourth pin axis.

8. The floating ball-parallel rod type liquid level and flow rate online detection device of claim 1, wherein the control circuit further comprises a zero switch in communication connection with the processing unit.

9. The floating ball-parallel rod type liquid level and flow rate online detection device according to claim 1, wherein the control circuit further comprises a power supply for supplying power to a circuit module in the control circuit.

10. The floating ball-parallel rod type liquid level and flow rate online detection device according to claim 9, wherein the control circuit further comprises an electromagnetic relay and an electromagnetic relay interrupt switch;

the rotation angle sensor and the force sensor are connected to the power supply through an electromagnetic relay;

the electromagnetic relay interruption switch is in communication connection with the processing unit and is used for controlling the on-off of the electromagnetic relay.

Technical Field

The invention belongs to the field of detection, relates to drainage pipeline liquid level flow velocity detection equipment, and particularly relates to a floating ball-parallel rod type liquid level flow velocity online detection device.

Background

The drainage pipeline has a harsh internal environment and changeable water flow conditions, has strict use requirements on the pipeline flowmeter, and has strong applicability mainly including strong anti-interference capability and can resist the interference of impurities in water. In addition, the space of the drainage pipeline is narrow, the places for installation are mainly various wells, and the water level flow velocity meter is expected to have low requirement on the installation space and be easy to fix. Thirdly, the use cost is required to be low, the device can be popularized in a large scale, and besides the price of the device, the installation cost and the later maintenance cost also need to be considered. But also needs to be able to perform remote data transmission and real-time online monitoring. In contrast to the above factors, the conventional flowmeters all have various defects and cannot meet the use requirements. For example, a rotor type flow velocity meter is easy to hang garbage firstly when in use; the Doppler flowmeter has strong waterproof and anti-fouling capability, but has high cost and cannot be popularized in a large area.

In order to solve the problem, the invention designs the floating ball-parallel rod type liquid level flow velocity online detection device suitable for the drainage pipeline.

Disclosure of Invention

In order to solve the problems of the prior art, the invention provides a floating ball-parallel rod type liquid level flow rate online detection device, which comprises:

a control circuit comprising a processing unit and a communication unit;

the corner sensor and the force sensor are respectively in communication connection with the processing unit, the acquired signal data are sent to the processing unit for calculation, and the calculation result is sent out through the communication unit;

the device comprises a parallel rod mechanism and a floating ball, wherein the parallel rod mechanism is connected to a fixed seat mounting plate through a corner sensor, and the floating ball is connected to the parallel rod mechanism through a force sensor.

Further, the parallel rod mechanism comprises a first connecting rod, a second connecting rod and a vertical rod, one end of the first connecting rod and one end of the second connecting rod are pivotally connected to the fixing seat mounting plate, and the other end of the first connecting rod and the other end of the second connecting rod are pivotally connected to the vertical rod.

Further, the parallel rod mechanism further includes:

the first fixing seat and the second fixing seat are fixedly arranged on the fixing seat mounting plate;

the first pin shaft is arranged in the second fixed seat in a matching way;

one end of the first connecting rod is matched with a rotating shaft of the corner sensor and installed in the first fixing seat, and one end of the second connecting rod is matched with the first pin shaft and installed in the second fixing seat.

Further, the rotation angle sensor comprises an encoder and a rotating shaft, and when the rotating shaft rotates, the encoder outputs an electric signal to mark a rotation angle;

and a rotating shaft of the rotation angle sensor penetrates through the end through hole of the first connecting rod and is connected to the first connecting rod.

Further, the parallel rod mechanism further includes:

the first connecting plate, the second pin shaft and the third pin shaft are arranged on the first connecting plate;

the first connecting plate and the second connecting plate are respectively arranged at the other ends of the first connecting rod and the second connecting rod and are connected to the vertical rod through a second pin shaft and a third pin shaft, so that the first connecting rod and the second connecting rod can rotate relative to the vertical rod around the second pin shaft and the third pin shaft.

Furthermore, the parallel rod mechanism further comprises a floating ball connecting rod, a second unequal angle steel and a fourth pin shaft;

the second unequal angle steel is connected to the lower end of the vertical rod through a fourth pin shaft pivot;

the floating ball is connected to the second unequal angle steel through a floating ball connecting rod.

Furthermore, the parallel rod mechanism further comprises a first inequilateral angle steel connected to the vertical rod, one end of the force sensor is fixed to the first inequilateral angle steel, and the second inequilateral angle steel abuts against the other end of the force sensor when rotating around the fourth pin shaft.

Further, the control circuit further comprises a zero setting switch which is connected with the processing unit in a communication mode.

Furthermore, the control circuit also comprises a power supply for supplying power to the circuit module in the control circuit.

Further, the control circuit further comprises an electromagnetic relay and an electromagnetic relay interrupt switch;

the rotation angle sensor and the force sensor are connected to the power supply through an electromagnetic relay;

the electromagnetic relay interruption switch is in communication connection with the processing unit and is used for controlling the on-off of the electromagnetic relay.

The floating ball-parallel rod type liquid level flow velocity online detection device can be used for remote data transmission and real-time online monitoring, and is simple and convenient to install and low in installation and maintenance cost.

Drawings

The above and other objects, features and advantages of the present disclosure will become more apparent by describing in greater detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts throughout.

Fig. 1 is a schematic view of the overall structure of a floating ball-parallel rod type liquid level flow rate online detection device according to an embodiment of the invention.

Fig. 2 is a schematic view of an installation structure of a water level detection mechanism of a floating ball-parallel rod type liquid level flow rate online detection system according to an embodiment of the invention.

FIG. 3 is a cross-sectional view of a first fixed seat of a parallel rod mechanism of the floating ball-parallel rod type liquid level flow rate on-line detection device according to the embodiment of the invention.

Fig. 4 is a sectional view of a second fixed seat of the parallel rod mechanism of the floating ball-parallel rod type liquid level flow rate on-line detection device according to the embodiment of the invention.

FIG. 5 is a schematic view of a mounting plate of a fixing seat of the floating ball-parallel rod type liquid level flow rate on-line detection device according to an embodiment of the present invention.

FIG. 6 is a schematic cross-sectional view of a connection point between a connecting rod and a vertical rod of a parallel rod mechanism of the floating ball-parallel rod type liquid level flow rate online detection device according to an embodiment of the invention.

Fig. 7 is a cross-sectional view of a pin joint structure at a force sensor of the floating ball-parallel rod type liquid level flow rate on-line detection device according to the embodiment of the invention.

Fig. 8 and 9 are schematic diagrams of a first inequilateral angle steel and a second inequilateral angle steel of the floating ball-parallel rod type liquid level flow rate online detection device according to the embodiment of the invention.

Fig. 10 and 11 are schematic structural views of a floating ball of the floating ball-parallel rod type liquid level flow rate online detection device according to the embodiment of the invention.

Fig. 12 is an operation state diagram of an electric control of the floating ball-parallel rod type liquid level flow rate on-line detection device according to the embodiment of the invention.

Fig. 13 is an overall circuit diagram of the floating ball-parallel rod type liquid level flow rate on-line detection device according to the embodiment of the invention.

Reference numerals:

an electric cabinet 1; a first aluminum profile 2; a second aluminum profile 3; a fixed seat mounting plate 4; a first fixed seat 5; a rotation angle sensor 6; a second connecting plate 7; a first pin 8; a second fixed seat 9; a first link 10; a second link 11; a first connecting plate 12; a second pin 13; a third pin 14; a vertical rod 15; a fourth pin shaft 16; a first inequilateral angle steel 17; a force sensor 18; a second inequilateral angle steel 19; a floating ball connecting rod 20; a floating ball 21; a set screw 22; an inspection well 23; an end bolt 24; a connecting pipe 25; a nut 26; a connecting bolt 27;

a power supply 30; a processing unit 40; a zero switch 41; an electromagnetic relay interruption switch 42; a power switch 31; a multi-path power distribution board 33; a voltage divider module 34; an electromagnetic relay 35; a first voltage reduction module 32; a second voltage reduction module 36; 4G unit 37; RS232 to TTL module 38; a force sensor transmitter 39; a first row of nuts 46; a second row of female terminals 45; a third row of female keys 44; a fourth row of female keys 43; a fifth row of female keys 48; GND first row female terminal 47; GND second row female terminal 51; a first resistor 49; a second resistor 50.

Detailed Description

Preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

The invention provides a floating ball-parallel rod type liquid level flow velocity on-line detection device, which comprises:

a control circuit comprising a processing unit and a communication unit;

the corner sensor and the force sensor are respectively in communication connection with the processing unit, the acquired signal data are sent to the processing unit for calculation, and the calculation result is sent out through the communication unit;

the device comprises a parallel rod mechanism and a floating ball, wherein the parallel rod mechanism is connected to a fixed seat mounting plate through a corner sensor, and the floating ball is connected to the parallel rod mechanism through a force sensor.

Further, the parallel rod mechanism comprises a first connecting rod, a second connecting rod and a vertical rod, one end of the first connecting rod and one end of the second connecting rod are pivotally connected to the fixing seat mounting plate, and the other end of the first connecting rod and the other end of the second connecting rod are pivotally connected to the vertical rod.

The floating ball floats on water, the floating ball is lifted by the water level, the vertical rod connected with the floating ball is lifted, the first connecting rod and the second connecting rod of the parallel rod mechanism are driven to rotate, the rotating shaft of the corner sensor connected with the parallel rod mechanism is rotated, and therefore the corner sensor gives water level data.

Furthermore, the parallel rod mechanism further comprises a floating ball connecting rod, a second unequal angle steel and a fourth pin shaft; the second unequal angle steel is connected to the lower end of the vertical rod through a fourth pin shaft pivot; the floating ball is connected to the second unequal angle steel through a floating ball connecting rod. The parallel rod mechanism further comprises a first unequal angle steel connected to the vertical rod, one end of the force sensor is fixed to the first unequal angle steel, and the second unequal angle steel abuts against the other end of the force sensor when rotating around the fourth pin shaft.

The water flow velocity V gives a thrust to the floating ball, so that the floating ball, the floating ball connecting rod and the second inequilateral angle steel generate a moment around the fourth pin shaft, the moment is balanced with the moment generated by the force of the second inequilateral angle steel against the force sensor, the thrust of the thrust water flow is transmitted to the force sensor through the second inequilateral angle steel, and the flow velocity is detected.

Further, the control circuit further comprises a zero setting switch which is connected with the processing unit in a communication mode.

Furthermore, the control circuit also comprises a power supply for supplying power to the circuit module in the control circuit.

Further, the control circuit further comprises an electromagnetic relay and an electromagnetic relay interrupt switch;

the rotation angle sensor and the force sensor are connected to the power supply through an electromagnetic relay;

the electromagnetic relay interruption switch is in communication connection with the processing unit and is used for controlling the on-off of the electromagnetic relay.

The overall working process of the floating ball-parallel rod type liquid level flow velocity online detection system is briefly described as follows:

the liquid level measuring process comprises the steps of pressing down a power switch to supply power to the whole control circuit, manually pulling an initial position of a floating ball to be placed at the bottommost part, measuring an initial included angle theta between a connecting rod and the vertical direction, then pressing down a zero setting switch to set the current numerical value of a corner sensor to be 0, when the liquid level rises, enabling the floating ball in water to move upwards along with the liquid level, a vertical rod connected with the floating ball to drive a first connecting rod and a second connecting rod to rotate relative to each other by taking a second pin shaft and a third pin shaft as shafts, and accordingly enabling a rotating shaft of the corner sensor to rotate by a certain angle.

And (3) flow velocity measurement process: the power switch 31 is pressed to supply power to the entire control system. The initial position of the float ball is set to the lowest part, and then the zero setting switch is pressed to set the value of the force sensor to 0 under the condition of no flow speed. When the flow velocity is high, the floating ball is under the action of thrust, the floating ball connecting rod connected with the floating ball and the second inequilateral angle steel can deflect around the fourth pin shaft to form a lever mechanism, and the force is amplified and then acts on the force sensor through the inequilateral angle steel. The analog signal of the force sensor is input into a processing unit, the amplified force T is read in real time, the thrust F (T L2/L1) borne by the floating ball is firstly obtained through conversion, and then the relation F (0.5 Crho v) between the force and the flow speed is obtained²A, converting the output flow speed in the processing unit 40, wherein T is the thrust detected by the corner sensor, F is the thrust received by the floating ball, L2 is the distance from the monitoring point to the floating ball, L1 is the distance from the pin shaft to the floating ball, C: cause-freeMinor drag coefficient, v: flow rate, A: incident flow area of the object, ρ: the density of the fluid. Data are uploaded to the cloud end through the unique ID address of the 4G unit, the 4G unit is in a virtual serial port creating mode, and the remote PC end monitors the flow rate theta in real time on line through a virtual serial port reading method.

To facilitate understanding of the solution of the embodiments of the present invention and the effects thereof, a specific application example is given below. It will be understood by those skilled in the art that this example is merely for the purpose of facilitating an understanding of the present invention and that any specific details thereof are not intended to limit the invention in any way.

The embodiment of the invention designs a floating ball-parallel rod type liquid level and flow velocity online detection device, which comprises an electric cabinet 1, a first aluminum profile 2, a second aluminum profile 3 and a fixed seat mounting plate 4 as shown in figures 1 and 2. The control circuit is installed in electric cabinet 1, and first aluminium alloy 2 and second aluminium alloy 3 are used for fixed electric cabinet 1. The electric cabinet 1 is fixed on the wall surface of the inspection well 23 through a fixing screw 22. The fixing seat mounting plate 4 is arranged on the front panel of the electric cabinet 1.

The control circuit comprises a processing unit 40, a 4G unit 37, a rotation angle sensor 6 and a force sensor 18, the processing unit 40 and the rotation angle sensor are in communication connection, acquired signal data are sent to the processing unit 40 to be calculated, and a calculation result is sent out through the 4G unit 37, so that an online detection result is acquired.

The parallel rod mechanism comprises a first connecting rod 10, a second connecting rod 11 and a vertical rod 15, one end of the first connecting rod 10 and one end of the second connecting rod 11 are pivotally connected to the fixed seat mounting plate 4, and the other end of the first connecting rod 10 and the other end of the second connecting rod 11 are pivotally connected to the vertical rod 15. The first link 10 and the second link 11 are arranged in parallel.

As shown in fig. 3 and 4, the parallel rod mechanism includes a first fixing seat 5 and a second fixing seat 9, which are rectangular seats with U-shaped openings, the width of the opening is matched with the width of the first connecting rod 10 and the second connecting rod 11, the two are both installed on a fixing seat installation plate 4, and the fixing seat installation plate 4 is installed on the front panel of the electric cabinet 1. As shown in fig. 5, the through holes d1 and d2 are respectively matched with the threaded holes a1 and a2 on the first fixing seat 5, and the through holes e1 and e2 are respectively matched with the threaded holes c1 and c2 on the second fixing seat 9. The threaded hole on the first fixing seat 5 is matched with the waist-shaped hole on the corner sensor mounting plate and used for fixing the corner sensor.

As shown in fig. 1 and 6, the parallel bar mechanism mainly includes a first connecting bar 10, a second connecting bar 11, a vertical bar 15, a second connecting plate 7, a first connecting plate 12, a connecting bolt 27, a second pin 13, and a third pin 14. One end of the first connecting rod 10 is provided with a through hole which is matched with the rotating shaft of the corner sensor 6 and is arranged in the U-shaped groove of the first fixed seat 5, and one end of the second connecting rod 11 is matched with the first pin shaft 8 and is arranged in the U-shaped groove of the second fixed seat 9. The other ends of the first link 10 and the second link 11 are formed with two through holes, which are engaged with the two through holes formed at the end of the first link plate 12 and fixed by a connecting bolt 27. A through hole is arranged at the other end of the first connecting plate and the other end of the second connecting plate, the first connecting plate and the second connecting plate are matched with the two through holes at one end of the vertical rod 15 and are fixed through a second pin shaft 13 and a third pin shaft 14, and therefore the first connecting rod and the second connecting rod can rotate relative to the vertical rod 15 around the second pin shaft 13 and the third pin shaft 14. The other end of the vertical rod 15 is provided with four through holes for mounting first unequal angle steel 17.

As shown in fig. 1, 7, 8, and 9, the structure for detecting the thrust of the float ball 21 after mechanical amplification further includes a first angle steel 17, a force sensor 18, a second angle steel 19, a vertical rod 15, and a fourth pin 16. The through hole h1 on the first unequal angle steel 17, the through hole m1 on the second unequal angle steel 19 and the through hole on the vertical rod 15 are used for the fourth pin shaft 16 to pass through, the four through holes f1 on the first unequal angle steel 17 are used for being matched with the four through holes on the vertical rod 15 and fixed together by bolts, and the two through holes k1 on the first unequal angle steel 17 are used for fixing the force sensor 18. This allows the second unequal angle 19 to rotate about the fourth pin 16 relative to the upright 15. Two through holes n1 on the second unequal angle steel 19 are used for fixing the floating ball connecting rod 20, and the end part of the floating ball connecting rod 20 is provided with internal threads, so that the floating ball connecting rod is convenient to be installed with the floating ball 21.

The rotation angle sensor 6 comprises an encoder and a rotating shaft, and the encoder outputs an electric signal to mark a rotation angle when the rotating shaft rotates. The rotation angle sensor 6 is mounted on the first fixed base 5, as shown in fig. 3. The rotating shaft passes through a through hole at the end part of the first connecting rod 10 and is fixed with the first connecting rod 10 through a jackscrew. So that the movement of the vertical rod 15 will drive the rotation of the connecting rod and the rotation of the rotating shaft of the rotation angle sensor 6.

One end of the force sensor 18 is fixed on the first unequal angle steel 17, and when the floating ball 21 is stressed to enable the second unequal angle steel 19 to rotate around the fourth pin shaft 16, the other end of the force sensor 18 is abutted so as to detect the flow thrust transmitted by the floating ball 21.

In the embodiment, the electric cabinet 1 is fixed on the wall surface of the inspection well 23 through the fixing screw 22, the floating ball 21 floats on water, and only the spherical segment with the diameter of 1/3 is immersed in the water. The water level rises and falls to enable the floating ball 21 to rise and fall, the vertical rod 15 connected with the floating ball rises and falls to drive the first connecting rod 10 and the second connecting rod 11 of the parallel rod mechanism to rotate, the rotating shaft of the corner sensor 6 connected with the parallel rod mechanism rotates, and therefore the corner sensor 6 gives water level data. The water flow velocity V provides a thrust force to the floating ball 21, so that the floating ball 21, the floating ball connecting rod 20 and the second unequal angle steel 19 generate a moment around the fourth pin shaft 16, the moment is balanced with the moment generated by the force of the second unequal angle steel 19 against the force sensor 18, the thrust force of the thrust water flow is transmitted to the force sensor 18 through the second unequal angle steel 18, and the flow velocity is detected.

Referring to fig. 1, 10 and 11, the floating ball 21 may be a hollow sphere, an elliptical hollow sphere, or a hollow sphere with a tapered tail.

Referring to fig. 12 and 13, the control circuit of the electric cabinet 1 includes a power supply 30, a processing unit 40, a zero setting switch 41, an electromagnetic relay interruption switch 42, and a 4G unit 37. A power supply 30 provides power to the various parts of the control circuit. The rotation angle sensor 6 and the force sensor 18 are in signal connection with the processing unit 40 via analog-to-digital conversion circuits. The 4G module 37, the zero switch 41 and the electromagnetic relay interrupt switch 42 are each communicatively connected to the processing unit 40.

In addition, the control circuit of the electric cabinet 1 further includes a power switch 31, a multi-path power distribution board 33, a voltage dividing module 34, an electromagnetic relay 35, a first voltage reducing module 32, a second voltage reducing module 36, an RS 232-to-TTL module 38, a force sensor transmitter 39, a first row of mother 46, a second row of mother 45, a third row of mother 44, a fourth row of mother 43, a fifth row of mother 48, a GND first row of mother end 47, a GND second row of mother end 51, a first resistor 49 and a second resistor 50.

The positive pole of the power supply 30 is connected with the power switch 31, the power switch is connected with the positive pole of the multi-path power supply distribution plate 33, and the negative pole of the power supply 30 is connected with the negative pole of the multi-path power supply distribution plate 33 and used for supplying power to the whole circuit control system.

The multi-path power supply distribution board 33 is divided into 5 paths, the first path VCC is connected with the positive electrode of the voltage division module 34, and the GND is connected with the negative electrode of the voltage division module. The second path VCC is connected to the positive input of the first voltage-reducing module 32, and the GND is connected to the negative input of the first voltage-reducing module 32. The third path VCC is connected to the positive input of the second voltage-reducing module 36, and the GND is connected to the negative input of the second voltage-reducing module 36. The fourth path VCC is connected to the anode of the 4G unit 37, and GND is connected to the cathode of the 4G unit 37. And the fifth path VCC is connected with the common end of the electromagnetic relay 35, and the GND end is connected with the interface No. 2 of the force sensor transmitter 39. For obtaining multiple equal voltage power supplies.

The OUT terminal of the voltage division module 34 is connected with the A3 port of the processing unit 40, and the GND terminal is connected with the GND first row female terminal 47 for detecting the residual electric quantity of the power supply 30

The OUT + of the first voltage-reducing module 32 is connected with the positive pole of the power supply of the processing unit 40, and the OUT-is connected with the negative pole of the power supply of the processing unit 40. For obtaining 12V power to power the processing unit 40.

The output of the second voltage-reducing module 36 is divided into three paths, wherein the OUT + of the first path is connected with the VCC end of the electromagnetic relay 35, and the OUT-is connected with the GND end of the electromagnetic relay 35. And the OUT + of the second path is connected with the fifth row female terminal 48, and the OUT-is connected with the GND first row female terminal 47. And the OUT + of the third path is connected with the common terminal of the electromagnetic relay 35. The device is used for obtaining a 5v power supply and supplying power to the electromagnetic relay 35, the electromagnetic relay interruption switch 42, the zero setting switch 41, the rotation angle sensor 6 and the RS 232-to-TTL module 38.

The normally open end of the electromagnetic relay 35 outputs two paths, the first path is connected with the interface 1 of the relay sensor transmitter 39, and the second path is connected with the VCC end of the corner sensor 6. IN1 of electromagnetic relay 35 is terminated to port No. 8 of processing unit 40, and IN2 of electromagnetic relay 35 is terminated to port No. 9 of processing unit 40. The power supply is used for controlling the power on and off of the rotation angle sensor 6 and the force sensor 18, and the electric quantity of the power supply is saved.

The TX port of the RS232 to TTL module 38 is connected to the TX0 port of the processing unit 40, the RX port of the RS232 to TTL module 38 is connected to the RX0 port of the processing unit 40, the VCC port of the RS232 to TTL module 38 is connected to the fifth row female terminal 48, and the GND port of the RS232 to TTL module 38 is connected to the GND first row female terminal 47.

The VCC terminal of the force sensor 18 is connected to the No. 5 port of the force sensor transmitter 39, the GND terminal is connected to the No. 6 port of the force sensor transmitter 39, the signal positive terminal is connected to the No. 3 port of the force sensor transmitter 39, and the signal negative terminal is connected to the No. 4 port of the force sensor transmitter 39. For measuring the flow rate by the relationship between the force and the flow rate.

Port 7 of the force sensor transducer 39 is connected to port a2 of the processing unit 40, and port 8 is connected to the first row GND female terminal 47. For converting the output into a voltage form.

The OUT terminal of the rotation angle sensor 6 is connected with the A1 port of the processing unit 40, and the GND port is connected with the GND first row female terminal 47. For measuring the height of the liquid level by angular transformation of the rotation angle sensor 6.

The positive pole of the zero setting switch 41 is connected with the fifth row female terminal 48, and the negative pole is connected with the GND first row female terminal 47. Since the installation position cannot be guaranteed to be the same every time, the zero switch 41 can zero the measured data at an arbitrary position.

The positive pole of the electromagnetic relay interruption switch 42 is connected with the fifth row female terminal 48, and the negative pole is connected with the GND first row female terminal 47. For controlling the on/off of the electromagnetic relay 35.

The first bus 46 outputs two paths, one path is connected to the port 3 of the processing unit 40, and the other path is connected to the resistor. The fourth row of bus 43 outputs two paths, one path is connected with the port 2 of the processing unit 40, and the other path is connected with the resistor. The output of the second row of bus bars 45 is connected to the GND second row of bus bars 51. The output of the third row of bus bars 44 is connected to the GND second row of bus bars 51. The second row of GND bus terminals 51 are connected to the GND port of the processing unit 40.

The overall working process of the floating ball-parallel rod type liquid level and flow rate online detection system of the embodiment is briefly described as follows:

the liquid level measuring process comprises the following steps: the power switch 31 is pressed to supply power to the entire control circuit. The initial position of manually pulling the floating ball 21 is arranged at the bottommost part, the initial included angle theta between the connecting rod and the vertical direction is measured, and then the zero switch 41 is pressed to set the current numerical value of the rotation angle sensor 6 to be 0. When the liquid level rises, the floating ball 21 in the water goes upwards along with the liquid level,

the vertical rod 15 connected with the floating ball 21 moves upwards to drive the first connecting rod 10 and the second connecting rod 11 to rotate relatively around the second pin 13 and the third pin 14 respectively, so that the rotation angle sensor 6 rotates by a certain angle, and the analog signal of the rotation angle sensor 6 is input into the processing unit 40 to read the angle β in real time, and according to the relationship between the rotated angle and the liquid level:

h equals Lcos θ -Lcos (θ + β) + H, and is converted into the height of the output liquid level in the processing unit 40.

As shown in figure 2, the liquid level height H, the length of the L connecting rod, the initial angle theta, the rotated angle measured in real time by β and the immersion depth of the floating ball into the liquid level are uploaded to the cloud end through the unique ID address of the 4G unit 37, the 4G unit 37 is in a virtual serial port creating mode, and the remote PC end monitors the liquid level height in real time on line through a virtual serial port reading method.

And (3) flow velocity measurement process: the power switch 31 is pressed to supply power to the entire control circuit. The initial position of the float 21 is set to the lowest position, and then the zero switch 41 is pressed to set the value of the force sensor 18 to 0 in the case where there is no flow rate. When the flow velocity is high, the floating ball 21 is pushed, the floating ball connecting rod 20 and the second unequal angle steel 19 which are connected with the floating ball 21 deflect around the fourth pin shaft 16 to form a lever mechanism, and the force is amplified and then acts on the force sensor 18 through the second unequal angle steel 19. The analog signal of the force sensor 18 is input to the processing unit 40, the amplified force T is read in real time, and the thrust force applied to the float ball is firstly obtained through conversion:

F＝T*L2/L1，

as shown in fig. 2: t is the thrust detected by the corner sensor, F is the thrust received by the floating ball, L2 is the distance from the monitoring point to the floating ball, and L1 is the distance from the pin shaft to the floating ball.

And then by the relationship between force and flow rate: f ═ 0.5C ρ v²A，

C: dimensionless resistance coefficient, v: flow rate, A: incident flow area of the object, ρ: the density of the fluid.

The magnitude of the output flow rate is scaled in the processing unit 40. Data are uploaded to the cloud end through the unique ID address of the 4G unit 37, the 4G unit 37 establishes the virtual serial port mode, and the remote PC end monitors the flow rate theta in real time on line through a method of reading the virtual serial port.

Having described embodiments of the present disclosure, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.