Separate settling slurry monitoring device
By installing a flow regulating valve and a flocculation monitoring module in the separation sedimentation tank, combined with sonar and image acquisition devices, the problem of inaccurate flocculant addition was solved, the sedimentation rate and production efficiency were improved, and flocculant waste was avoided.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HEBEI WENFENG NEW MATERIAL CO LTD
- Filing Date
- 2025-07-07
- Publication Date
- 2026-06-26
AI Technical Summary
In existing separation and sedimentation processes, the amount of flocculant added is not precise enough, resulting in slow sedimentation rates or flocculant waste, which affects production efficiency.
Flow regulating valves and flocculation monitoring modules are installed at different locations in the separation and settling tank. The flow rate of flocculant and red mud slurry is automatically adjusted by the controller, and real-time monitoring is carried out in combination with sonar transmission module and image acquisition device to ensure the accurate addition of flocculant.
It enables precise addition of flocculants, improves settling rate and production efficiency, avoids flocculant waste, and ensures production continuity and safety.
Smart Images
Figure CN224404486U_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to the field of automatic control technology, and in particular to a monitoring device for separated and settled turbid liquids. Background Technology
[0002] Natural aluminum ore has a complex composition. Even after the alumina is dissolved by strong alkali, a large amount of insoluble impurities such as silica and quartz still exist in the form of solid particles. Therefore, it is necessary to separate and precipitate the solid-liquid mixture in a separation and settling tank.
[0003] In the separation and settling tank, red mud particles and sodium aluminate solution are mixed together in the form of a red mud suspension. Under static conditions, the red mud particles settle to the bottom of the tank due to gravity, while the sodium aluminate liquid flows upward due to the pressure of the settling red mud particles, forming a clear overflow. The overflow enters the leaf filter from the clear liquid overflow device for secondary purification in the subsequent causticization production of alumina. The separation and settling process requires the addition of an appropriate amount of flocculant to the settling tank to accelerate settling. Existing methods of addition are mostly continuous conveying, resulting in an unbalanced ratio of red mud slurry to flocculant in the settling tank, leading to slow settling rates or flocculant waste. Utility Model Content
[0004] This disclosure provides a monitoring device for separated sedimentation turbid liquid to solve the problem of insufficient accuracy in the addition of flocculants in existing separation sedimentation processes.
[0005] This disclosure provides a monitoring device for separated sedimentation turbid liquid, which is applied to a separation sedimentation tank. The separation sedimentation tank is equipped with a dilution tank and a flocculant tank at its front end.
[0006] A buffer tank and a first flow regulating valve are sequentially arranged between the dilution tank and the separation sedimentation tank, and a second flow regulating valve is arranged between the flocculant tank and the separation sedimentation tank.
[0007] The separation sedimentation tank is equipped with a flocculation monitoring module, and the control terminals of the first flow regulating valve and the second flow regulating valve are respectively connected to the two signal output terminals of the controller.
[0008] In one exemplary embodiment of this disclosure, the flocculation monitoring module includes a housing, within which a supplementary light and an image acquisition device are disposed, the image acquisition device being used to connect to a display terminal.
[0009] In one exemplary embodiment of this disclosure, the wall of the separation sedimentation tank is provided with a sonar transmitting module and a sonar receiving module, both of which are connected to a controller.
[0010] The sonar transmitting module includes switching transistors Q1 and Q2, a transformer PT, an inductor L1, and a transducer. The control terminal of switching transistor Q1 is connected to the first output terminal of the waveform generating circuit, the control terminal of switching transistor Q2 is connected to the second output terminal of the waveform generating circuit, the first terminal of switching transistor Q1 is connected to the first input terminal of the transformer PT, and the second terminal of switching transistor Q1 is grounded.
[0011] The first terminal of the switching transistor Q2 is connected to the second input terminal of the transformer PT, and the second terminal of the switching transistor Q2 is connected to the first input terminal of the transformer PT. The center tap of the transformer PT is connected to the first power supply.
[0012] The first output terminal of the transformer PT is connected to the first terminal of the transducer, and the second output terminal of the transformer PT is connected to the second terminal of the transducer.
[0013] In one exemplary embodiment of this disclosure, an inductor L1 is provided between the first output terminal of the transformer PT and the first terminal of the transducer.
[0014] In one exemplary embodiment of this disclosure, the waveform generating circuit includes a resistor R1, a potentiometer RP1, a comparator U1, a triangular wave generating circuit, and a NOT gate U2.
[0015] The first end of resistor R1 is connected to the second power supply, the second end of resistor R1 is grounded through potentiometer RP1, the second end of resistor R1 is connected to the first input terminal of comparator U1, the second input terminal of comparator U1 is connected to the triangular wave generating circuit, and the output terminal of comparator U1 is the first output terminal of the waveform generating circuit.
[0016] The output of the comparator U1 is connected to the input of the NOT gate U2, and the output of the NOT gate U2 is the second output of the waveform generation circuit.
[0017] In one exemplary embodiment of this disclosure, NAND gate U3, AND gate U4A, and AND gate U4B are provided between the first output terminal of the waveform generating circuit and the control terminal of the switching transistor Q1, and between the second output terminal of the waveform generating circuit and the control terminal of the switching transistor Q2.
[0018] The first input terminal of the NAND gate U3 is connected to the output terminal of the comparator U1, and the second input terminal of the NAND gate U3 is connected to the output terminal of the NOT gate U2.
[0019] The output of NAND gate U3 is connected to the first input of AND gate U4A, the second input of AND gate U4A is connected to the output of comparator U1, and the output of AND gate U4A is connected to the control terminal of switch Q1.
[0020] The output of the NAND gate U3 is connected to the first input of the AND gate U4B, the second input of the AND gate U4B is connected to the output of the NOT gate U2, and the output of the AND gate U4B is connected to the control terminal of the switch Q1.
[0021] In one exemplary embodiment of this disclosure, a switching transistor Q5 is provided between the center tap of the transformer PT and the first power supply.
[0022] The driving circuit of the switch Q5 includes a switch Q6. The control terminal of the switch Q6 is connected to the controller. The first terminal of the switch Q6 is grounded, and the second terminal of the switch Q6 is connected to the control terminal of the switch Q5.
[0023] The working principle and beneficial effects of the separation and sedimentation turbidity monitoring device provided in this embodiment are as follows:
[0024] In this embodiment, a buffer tank is provided between the separation and settling tank and the dilution tank. The buffer tank transports the red mud slurry to the separation and settling tank. A first flow control valve is installed in the pipeline between the buffer tank and the separation and settling tank to control the flow rate of the red mud slurry. At the same time, a second flow control valve is installed in the pipeline between the flocculant tank and the settling tank. Both control valves are electrically connected to the controller. Based on the monitoring information of the flocculation monitoring module, the controller automatically adjusts the first and second flow control valves to match the flocculant delivery rate with the red mud slurry delivery rate. This ensures the continuity of red mud slurry settling while avoiding flocculant waste and improving the settling effect. Attached Figure Description
[0025] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0026] Figure 1 This is a schematic block diagram of the separation and sedimentation turbidity monitoring device provided in the embodiments of this disclosure;
[0027] Figure 2 This is a circuit diagram of the sonar transmitting module provided in an embodiment of this disclosure. Detailed Implementation
[0028] To enable those skilled in the art to better understand this solution, the technical solutions in the embodiments of this solution will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this solution, not all of them. Based on the embodiments of this solution, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this solution.
[0029] The term "comprising" and any other variations thereof in the specification, claims, and accompanying drawings of this invention mean "including but not limited to," and are intended to cover a non-exclusive inclusion, not limited to the examples listed herein. Furthermore, the terms "first" and "second," etc., are used to distinguish different objects, not to describe a specific order.
[0030] The implementation of this disclosure will be described in detail below with reference to the specific accompanying drawings:
[0031] Figure 1 This is a schematic block diagram of a monitoring device for separating and settling turbid liquids provided in an embodiment of this disclosure. (Refer to...) Figure 1 This separation and sedimentation turbidity monitoring device is applied to a separation and sedimentation tank, which is equipped with a dilution tank and a flocculant tank at the front end.
[0032] A buffer tank and a first flow regulating valve are sequentially installed between the dilution tank and the separation sedimentation tank, and a second flow regulating valve is installed between the flocculant tank and the separation sedimentation tank.
[0033] A flocculation monitoring module is installed in the separation sedimentation tank. The control terminals of the first flow regulating valve and the second flow regulating valve are respectively connected to the two signal output terminals of the controller.
[0034] In this embodiment, the dilution tank is a device used to dilute the red mud slurry after processes such as leaching. In the alumina production process, the red mud slurry from processes such as high-pressure leaching has a high concentration and poor fluidity, which is not conducive to subsequent separation and sedimentation operations. By adding an appropriate amount of diluent (usually water or mother liquor) to the dilution tank, the concentration of the red mud slurry can be reduced, its fluidity improved, and it made easier to perform solid-liquid separation in the separation and sedimentation tank.
[0035] A buffer tank is set up between the separation and settling tank and the dilution tank. The buffer tank transports the red mud slurry to the separation and settling tank. A first flow control valve is installed in the pipeline between the buffer tank and the separation and settling tank to control the flow rate of the red mud slurry. At the same time, a second flow control valve is installed in the pipeline between the flocculant tank and the settling tank. Both control valves are electrically connected to the controller. Based on the monitoring information of the flocculation monitoring module, the controller automatically adjusts the first and second flow control valves to match the flocculant delivery rate with the red mud slurry delivery rate. This ensures the continuity of red mud slurry settling while avoiding flocculant waste and improving the settling effect.
[0036] In one exemplary embodiment of this disclosure, the flocculation monitoring module includes a housing, within which a supplementary light and an image acquisition device are disposed, the image acquisition device being used to connect to a display terminal.
[0037] In this embodiment, the flocculation monitoring module includes components such as a supplementary light, an image acquisition device (specifically an observation camera), and a waterproof housing. The supplementary light can emit a linear light curtain that passes through the flocs and is scattered on the surface of the flocs. The scattered light enters the observation camera, and the image acquired by the observation camera is displayed on a display terminal such as a mobile phone or computer, which facilitates operators to monitor the flocculation and sedimentation status in real time.
[0038] Operators can adjust the control parameters of the controller via the host computer based on the monitored flocculation and sedimentation status to regulate the first and second flow control valves, so that the flocculant delivery rate matches the red mud slurry delivery rate.
[0039] In one exemplary embodiment of this disclosure, the walls of the separation sedimentation tank are equipped with a sonar transmitting module and a sonar receiving module, both of which are connected to a controller.
[0040] The sonar transmitting module includes switching transistors Q1 and Q2, a transformer PT, an inductor L1, and a transducer. The control terminal of switching transistor Q1 is connected to the first output terminal of the waveform generation circuit, and the control terminal of switching transistor Q2 is connected to the second output terminal of the waveform generation circuit. The first terminal of switching transistor Q1 is connected to the first input terminal of the transformer PT, and the second terminal of switching transistor Q1 is grounded.
[0041] The first terminal of the switching transistor Q2 is connected to the second input terminal of the transformer PT, and the second terminal of the switching transistor Q2 is connected to the first input terminal of the transformer PT. The center tap of the transformer PT is connected to the first power supply.
[0042] The first output terminal of transformer PT is connected to the first terminal of transducer, and the second output terminal of transformer PT is connected to the second terminal of transducer.
[0043] In this embodiment, the sonar transmitting module and the sonar receiving module constitute a turbidity monitoring module. Both the sonar transmitting module and the sonar receiving module are located above the side wall of the separation settling tank. The sonar transmitting module emits special frequency sound waves towards the bottom of the tank. After being reflected by the bottom of the tank, the sound waves are received by the sonar receiving module. The turbidity of the mixed liquid in the separation settling tank is different, and the intensity of the received signal is different. Therefore, based on the difference in the sound wave signal received by the sonar receiving module, accurate monitoring and feedback of the turbidity of the overflow slurry in the settling tank can be achieved.
[0044] Currently, commonly used turbidity monitoring methods include infrared spectroscopy, ultrasonic spectroscopy, and radiometric monitoring. These methods all rely on transmitting and receiving sensors, but prolonged immersion of the equipment in red mud significantly reduces its lifespan and can lead to inaccurate monitoring data. This embodiment eliminates the need to immerse the monitoring device in red mud slurry, enabling real-time monitoring of the thickness of the three-phase layer and the turbidity of the clear liquid overflow layer within the settling tank, thus avoiding subsequent equipment malfunctions and potential production safety hazards.
[0045] The sonar transmitting module operates as follows: The first and second output terminals of the waveform generation circuit output two mutually exclusive square wave signals, which are input to the control terminals of switching transistors Q1 and Q2, respectively. When the control terminal of Q1 is high and the control terminal of Q2 is low, Q1 is turned on and Q2 is turned off. The first power supply Vin flows through the transformer PT via Q1, inducing a pulse voltage in the first direction at the output terminal of PT. When the control terminal of Q1 is low and the control terminal of Q2 is high, Q1 is turned off and Q2 is turned on. The first power supply Vin flows through the transformer PT via Q2, inducing a pulse voltage in the second direction at the output terminal of PT. The pulse voltages in the first and second directions respectively form the positive and negative half-cycles of a complete voltage cycle, which are applied across the transducer, exciting it to emit acoustic signals.
[0046] As can be seen from the above, this embodiment achieves the amplification of the square wave signal output by the waveform generation circuit by controlling the switching transistors Q1 and Q2 to conduct alternately, thereby realizing the reliable driving of the transducer.
[0047] In one exemplary embodiment of this disclosure, an inductor L1 is provided between the first output terminal of the transformer PT and the first terminal of the transducer.
[0048] In this embodiment, considering the static capacitance of the transducer, a phase angle exists between the voltage and current on the transducer during resonance, resulting in a power factor less than 1 and reduced output power. To improve output power, this embodiment incorporates an inductor L1 in series in the transducer's drive circuit. The inductor L1 and the transducer's static capacitance form a series resonance. This series resonant circuit exhibits pure impedance externally, thereby eliminating the phase angle between the voltage and current.
[0049] As can be seen from the above, the setting of inductor L1 in this embodiment eliminates the influence of the static capacitance of the transducer, which is beneficial to improving the output power of the first power supply.
[0050] In one exemplary embodiment of this disclosure, the waveform generating circuit includes a resistor R1, a potentiometer RP1, a comparator U1, a triangular wave generating circuit, and a NOT gate U2.
[0051] The first terminal of resistor R1 is connected to the second power supply, and the second terminal of resistor R1 is grounded through potentiometer RP1. The second terminal of resistor R1 is connected to the first input terminal of comparator U1, and the second input terminal of comparator U1 is connected to the triangular wave generating circuit. The output terminal of comparator U1 is the first output terminal of the waveform generating circuit.
[0052] The output of comparator U1 is connected to the input of NOT gate U2, and the output of NOT gate U2 is the second output of the waveform generator circuit.
[0053] In this embodiment, considering that different sizes of separation settling tanks will affect the propagation effect of sound waves, for larger settling tanks, higher transmission power is required to ensure that the sound waves can reach the bottom of the tank and return to the sound wave receiving module; while for smaller separation settling tanks, lower transmission power is sufficient to meet the requirements, and interference caused by excessive reflection or scattering of sound waves can also be avoided.
[0054] Therefore, this embodiment achieves the adjustment of sound wave emission power by setting a series circuit of resistor R1 and potentiometer RP1. Its working principle is as follows: by adjusting the resistance value of potentiometer RP1, the terminal voltage of potentiometer RP1 can be adjusted. The terminal voltage of potentiometer RP1 is connected to the first input terminal of comparator U1 and compared with the triangular carrier wave output by the triangular wave generator circuit. When the terminal voltage of potentiometer RP1 is greater than the triangular carrier wave voltage, comparator U1 outputs a high-level signal; when the terminal voltage of potentiometer RP1 is less than the triangular carrier wave voltage, comparator U1 outputs a low-level signal. Therefore, a square wave signal with the same frequency as the triangular carrier wave is output at the output terminal of comparator U1.
[0055] The output of comparator U1 serves as the first output of the waveform generation circuit, connected to switch Q1, which can control the switching of switch Q1 to turn on or off. The output of comparator U1, after passing through NOT gate U2, serves as the second output of the waveform generation circuit, connected to switch Q1, which can control the switching of switch Q2 to turn on or off.
[0056] The higher the voltage across potentiometer RP1, the higher the duty cycle of the output square wave signal, the shorter the conduction time of switching transistors Q1 and Q2, and the lower the sound wave emission power. Conversely, the lower the voltage across potentiometer RP1, the lower the duty cycle of the output square wave signal, the longer the conduction time of switching transistors Q1 and Q2, and the higher the sound wave emission power.
[0057] In practical use, potentiometer RP1 can be made into a rotary switch. By adjusting the position of the knob, the resistance of potentiometer RP1 can be adjusted, thereby adjusting the sound wave emission power.
[0058] As can be seen from the above, the settings of resistor R1, potentiometer RP1, comparator U1, triangular wave generator circuit and NOT gate U2 in this embodiment can adjust the sound wave emission power according to actual needs, which not only saves power consumption, but also avoids interference caused by excessive reflection or scattering of sound waves.
[0059] In an exemplary embodiment of this disclosure, NAND gate U3, AND gate U4A, and AND gate U4B are provided between the first output terminal of the waveform generating circuit and the control terminal of the switching transistor Q1, and between the second output terminal of the waveform generating circuit and the control terminal of the switching transistor Q2.
[0060] The first input of NAND gate U3 is connected to the output of comparator U1, and the second input of NAND gate U3 is connected to the output of NAND gate U2.
[0061] The output of NAND gate U3 is connected to the first input of AND gate U4A, the second input of AND gate U4A is connected to the output of comparator U1, and the output of AND gate U4A is connected to the control terminal of switching transistor Q1.
[0062] The output of NAND gate U3 is connected to the first input of AND gate U4B, the second input of AND gate U4B is connected to the output of NAND gate U2, and the output of AND gate U4B is connected to the control terminal of switch Q1.
[0063] In this embodiment, under normal circumstances, the output of comparator U1 and the output of NOT gate U2 are mutually exclusive signals. If the output of comparator U1 and the output of NOT gate U2 are both high due to device delay, it will cause switch Q1 and switch Q2 to be turned on at the same time, thereby outputting pulse voltages in the first direction and the second direction at the output of transformer PT at the same time, which will damage the transformer.
[0064] To avoid the aforementioned problems, this embodiment provides NAND gates U3, U4A, and U4B between the first output of the waveform generation circuit and the control terminal of the switching transistor Q1, and between the second output of the waveform generation circuit and the control terminal of the switching transistor Q2. The output of comparator U1 and the output of NOT gate U2 are respectively connected to the two inputs of NAND gate U3. When the outputs of comparator U1 and NOT gate U2 are both high, NAND gate U3 outputs a low-level signal. This low-level signal is connected to one input of AND gate U4A and AND gate U4B, and performs a logical AND operation with the outputs of comparator U1 and NOT gate U2. The outputs of AND gates U4A and U4B are both low-level signals, turning off switching transistors Q1 and Q2, thus preventing simultaneous conduction of switching transistors Q1 and Q2 and causing damage to the transformer.
[0065] As can be seen from the above, the setting of NAND gate U3, AND gate U4A and AND gate U4B in this embodiment adds dead time to the control of switch Q1 and switch Q2, so as to avoid damage to the transformer caused by switch Q1 and switch Q2 being turned on at the same time.
[0066] In one exemplary embodiment of this disclosure, a switching transistor Q5 is provided between the center tap of the transformer PT and the first power supply.
[0067] The driving circuit for switch Q5 includes switch Q6. The control terminal of switch Q6 is connected to the controller. The first terminal of switch Q6 is grounded, and the second terminal of switch Q6 is connected to the control terminal of switch Q5.
[0068] In this embodiment, a switching transistor Q5 is provided between the intermediate tap of the transformer PT and the first power supply. By controlling the switching transistor Q5 to turn on and off at regular intervals, the acoustic wave transmitting module can be controlled to emit acoustic wave signals at regular intervals.
[0069] To ensure reliable driving of switch Q5, this embodiment amplifies the control signal CTRL output by the controller using switch Q6. Its working principle is as follows: When an acoustic signal needs to be emitted, the controller outputs a high-level control signal to the control terminal of switch Q6, turning on both switch Q6 and Q5, thus connecting the first power supply to the center tap of transformer PT; when the acoustic signal needs to be turned off, the controller outputs a low-level control signal to the control terminal of switch Q6, turning off both switch Q6 and Q5, thus disconnecting the first power supply from the center tap of transformer PT.
[0070] As can be seen from the above, the configuration of switching transistors Q5 and Q6 in this embodiment enables the timed operation of the acoustic wave emission module, avoiding unnecessary long-term operation.
[0071] The above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit it. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this disclosure.
Claims
1. A monitoring device for separated sedimentation turbid liquid, applied in a separation sedimentation tank, characterized in that, The front end of the separation sedimentation tank is equipped with a dilution tank and a flocculant tank. A buffer tank and a first flow regulating valve are sequentially arranged between the dilution tank and the separation sedimentation tank, and a second flow regulating valve is arranged between the flocculant tank and the separation sedimentation tank. The separation sedimentation tank is equipped with a flocculation monitoring module, and the control terminals of the first flow regulating valve and the second flow regulating valve are respectively connected to the two signal output terminals of the controller.
2. The monitoring device for separated and settled turbid liquid as described in claim 1, characterized in that, The flocculation monitoring module includes a housing, inside which are installed a supplementary light and an image acquisition device, which is used to connect to a display terminal.
3. The monitoring device for separated and settled turbid liquid as described in claim 1, characterized in that, The walls of the separation sedimentation tank are equipped with sonar transmitting modules and sonar receiving modules, both of which are connected to a controller. The sonar transmitting module includes switching transistors Q1 and Q2, a transformer PT, an inductor L1, and a transducer. The control terminal of switching transistor Q1 is connected to the first output terminal of the waveform generating circuit, the control terminal of switching transistor Q2 is connected to the second output terminal of the waveform generating circuit, the first terminal of switching transistor Q1 is connected to the first input terminal of the transformer PT, and the second terminal of switching transistor Q1 is grounded. The first terminal of the switching transistor Q2 is connected to the second input terminal of the transformer PT, and the second terminal of the switching transistor Q2 is connected to the first input terminal of the transformer PT. The center tap of the transformer PT is connected to the first power supply. The first output terminal of the transformer PT is connected to the first terminal of the transducer, and the second output terminal of the transformer PT is connected to the second terminal of the transducer.
4. The monitoring device for separated and settled turbid liquid as described in claim 3, characterized in that, An inductor L1 is provided between the first output terminal of the transformer PT and the first terminal of the transducer.
5. The monitoring device for separated and settled turbid liquid as described in claim 3, characterized in that, The waveform generation circuit includes a resistor R1, a potentiometer RP1, a comparator U1, a triangular wave generation circuit, and a NOT gate U2. The first end of resistor R1 is connected to the second power supply, the second end of resistor R1 is grounded through potentiometer RP1, the second end of resistor R1 is connected to the first input terminal of comparator U1, the second input terminal of comparator U1 is connected to the triangular wave generating circuit, and the output terminal of comparator U1 is the first output terminal of the waveform generating circuit. The output of the comparator U1 is connected to the input of the NOT gate U2, and the output of the NOT gate U2 is the second output of the waveform generation circuit.
6. The monitoring device for separated and settled turbid liquid as described in claim 5, characterized in that, NAND gate U3, AND gate U4A, and AND gate U4B are provided between the first output terminal of the waveform generating circuit and the control terminal of the switching transistor Q1, and between the second output terminal of the waveform generating circuit and the control terminal of the switching transistor Q2. The first input terminal of the NAND gate U3 is connected to the output terminal of the comparator U1, and the second input terminal of the NAND gate U3 is connected to the output terminal of the NOT gate U2. The output of NAND gate U3 is connected to the first input of AND gate U4A, the second input of AND gate U4A is connected to the output of comparator U1, and the output of AND gate U4A is connected to the control terminal of switch Q1. The output of the NAND gate U3 is connected to the first input of the AND gate U4B, the second input of the AND gate U4B is connected to the output of the NOT gate U2, and the output of the AND gate U4B is connected to the control terminal of the switch Q1.
7. The monitoring device for separated and settled turbid liquid as described in claim 3, characterized in that, A switching transistor Q5 is installed between the center tap of the transformer PT and the first power supply. The driving circuit of the switch Q5 includes a switch Q6. The control terminal of the switch Q6 is connected to the controller. The first terminal of the switch Q6 is grounded, and the second terminal of the switch Q6 is connected to the control terminal of the switch Q5.