Intelligent spray water curtain dust removal system

Abstract

The present invention relates to the field of spray dust removal technology, and proposes an intelligent spray water curtain dust removal system, including a main control unit, a laser transmitting circuit, a laser receiving circuit and a communication unit, wherein the laser transmitting circuit is used to transmit laser signals, the laser receiving circuit is used to receive laser signals, the laser receiving circuit is connected to the main control unit, and the main control unit is connected to the terminal by means of the communication unit. Through the above technical solution, the problem of unstable laser beam emitted by the laser of the laser dust detector in the related art is solved.

Description

Technical Field

[0001] The invention relates to the technical field of spray dust removal, and in particular to an intelligent spray water curtain dust removal system. Background Art

[0002] Dust is one of the main causes of urban air pollution. Dust generated by roads, construction sites, stone crushing, coal mine transportation, commercial concrete processing and other places enters the air environment under the action of certain power. These particles are repeatedly lifted and settled, which easily causes repeated air pollution, thus seriously affecting the health of urban residents and the urban ecological environment. With the continuous development of science and technology, human beings have higher and higher demands for environmental protection and healthy life. Intelligent spray water curtain dust removal equipment is applied to various industrial unorganized dust pollution occasions. Through real-time detection of dust data in the on-site environment, dust can be processed in real time. Among the many environmental monitoring equipment, laser dust detectors have gradually become important tools in the fields of environmental protection, health, safety, etc. due to their high sensitivity and real-time monitoring. When the laser dust detector works, the laser needs to emit a laser beam, which forms a detection area of ​​a certain diameter after passing through the lens. When the dust particles in the air pass through the detection area, they will scatter with the laser and produce scattered light of different directions and intensities. The dust concentration is determined by detecting the intensity of the scattered light signal, and then a spray is used to remove dust in real time and reasonably according to the dust concentration. However, due to the complex working environment, the laser beam emitted by the laser dust detector is unstable, resulting in water waste or poor dust removal effect during dust removal. Summary of the invention

[0003] The present invention provides an intelligent spray water curtain dust removal system, which solves the problem of unstable laser beam emitted by the laser of the laser dust detector in the related art.

[0004] The technical solution of the present invention is as follows:

[0005] An intelligent spray water curtain dust removal system includes a main control unit, a laser transmitting circuit, a laser receiving circuit and a communication unit, wherein the laser transmitting circuit is used to transmit a laser signal, the laser receiving circuit is used to receive a laser signal, the laser receiving circuit is connected to the main control unit, and the main control unit is connected to the terminal by means of the communication unit, and the laser transmitting circuit includes a transistor Q1, a transistor Q2, a capacitor C1, a transformer T1, a laser transmitter P1, a resistor R2, a resistor R3, an operational amplifier U4, a resistor R4 and a transistor Q4;

[0006] The first input end of the transformer T1 is connected to the collector of the transistor Q1, the second input end of the transformer T1 is connected to the collector of the transistor Q2, the third input end of the transformer T1 is connected to a 12V power supply, and the capacitor C1 is connected in parallel between the first input end of the transformer T1 and the second input end of the transformer T1;

[0007] The first feedback end of the transformer T1 is connected to the base of the transistor Q1, the second feedback end of the transformer T1 is connected to the base of the transistor Q2, the emitter of the transistor Q1 is grounded, the emitter of the transistor Q2 is grounded, the first output end of the transformer T1 is connected to the first end of the laser emitter P1, the second end of the laser emitter P1 is grounded, and the second output end of the transformer T1 is grounded;

[0008] The first end of the resistor R2 is connected to the first end of the laser emitter P1, the second end of the resistor R2 is grounded through the resistor R3, the second end of the resistor R2 is connected to the inverting input end of the operational amplifier U4, the non-inverting input end of the operational amplifier U4 is connected to the Vref reference voltage, the output end of the operational amplifier U4 is connected to the inverting input end of the operational amplifier U4 through the resistor R4, the output end of the operational amplifier U4 is connected to the base of the transistor Q4, the collector of the transistor Q4 is connected to a 5V power supply, and the emitter of the transistor Q4 is connected to the second feedback end of the transformer T1.

[0009] Furthermore, the laser emitting circuit in the present invention also includes an operational amplifier U2, a switch tube Q3 and an inductor L1. The second end of the resistor R2 is connected to the inverting input end of the operational amplifier U2, the non-inverting input end of the operational amplifier U2 is used to receive a triangular wave signal, the output end of the operational amplifier U2 is connected to the control end of the switch tube Q3, the first end of the inductor L1 is connected to the emitter of the transistor Q1, the first end of the inductor L1 is connected to the emitter of the transistor Q2, the second end of the inductor L1 is connected to the first end of the switch tube Q3, and the second end of the switch tube Q3 is grounded.

[0010] Furthermore, the present invention also includes a power buffer circuit, which includes an inductor L2, a resistor R8, a capacitor C5, a capacitor C6 and a relay K1, wherein a first end of the inductor L2 is connected to a 12V power supply, a second end of the inductor L2 is grounded through the capacitor C6, a second end of the inductor L2 is connected to a normally open end of the relay K1, a first end of the resistor R8 is connected to a 12V power supply, a second end of the resistor R8 is grounded through the capacitor C5, a second end of the resistor R8 is connected to a first input end of the relay K1, a second input end of the relay K1 is grounded, and a common end of the relay K1 is connected to a third input end of the transformer T1.

[0011] Furthermore, the laser receiving circuit in the present invention includes a laser receiver P2, a resistor R9, a resistor R10, an operational amplifier U3, a variable resistor RP1, an operational amplifier U3 and a resistor R11. The first end of the laser receiver P2 is grounded through the resistor R9, the second end of the laser receiver P2 is grounded, the first end of the laser receiver P2 is connected to the in-phase input end of the operational amplifier U3 through the resistor R10, the inverting input end of the operational amplifier U3 is connected to the sliding end of the variable resistor RP1, the first end of the variable resistor RP1 is connected to a 5V power supply, the second end of the variable resistor RP1 is grounded, the output end of the operational amplifier U3 is connected to the inverting input end of the operational amplifier U3 through the resistor R11, and the output end of the operational amplifier U3 is connected to the first input end of the main control unit.

[0012] Further, in the present invention, a filtering circuit is also included between the output end of the operational amplifier U3 and the first input end of the main control unit. The filtering circuit includes a resistor R12, a capacitor C10, a resistor R13, a capacitor C11, a resistor R14, an operational amplifier U5, a resistor R17 and a resistor R15. The first end of the resistor R12 is connected to the output end of the operational amplifier U3, the second end of the resistor R12 is grounded through the capacitor C10, the second end of the resistor R12 is connected to the non-inverting input end of the operational amplifier U5 through the capacitor C11, the non-inverting input end of the operational amplifier U5 is grounded through the resistor R14, the inverting input end of the operational amplifier U5 is grounded through the resistor R17, the output end of the operational amplifier U5 is connected to the inverting input end of the operational amplifier U5 through the resistor R15, the output end of the operational amplifier U5 is connected to the second end of the resistor R12 through the resistor R13, and the output end of the operational amplifier U5 is connected to the first input end of the main control unit.

[0013] Furthermore, the present invention also includes an ultrasonic transmitting circuit and an ultrasonic receiving circuit, both of which are connected to the main control unit. The ultrasonic transmitting circuit includes a transformer T2, a switch tube Q5 and an ultrasonic transmitting probe X1. The first input end of the transformer T2 is connected to a 12V power supply, the second input end of the transformer T2 is connected to the first end of the switch tube Q5, the second end of the switch tube Q5 is grounded, the control end of the switch tube Q5 is connected to the first output end of the main control unit, the first output end of the transformer T2 is connected to the first end of the ultrasonic transmitting probe X1, the second output end of the transformer T2 is grounded, and the second end of the ultrasonic transmitting probe X1 is grounded.

[0014] Further, the ultrasonic receiving circuit in the present invention includes an ultrasonic receiving probe X2, a capacitor C12, a resistor R21, a resistor R20, a transistor Q6, a resistor R22 and a resistor R23, the first end of the ultrasonic receiving probe X2 is connected to the base of the transistor Q6 through the capacitor C12, the second end of the ultrasonic receiving probe X2 is grounded, the base of the transistor Q6 is connected to a 5V power supply through the resistor R21, the base of the transistor Q6 is grounded through the resistor R20, the collector of the transistor Q6 is connected to the 5V power supply through the resistor R22, the emitter of the transistor Q6 is grounded through the resistor R23, and the collector of the transistor Q6 is connected to the second input end of the main control unit.

[0015] The working principle and beneficial effects of the present invention are:

[0016] In the present invention, the laser emitting circuit is used to emit a laser beam. When dust particles in the air pass through the detection area, they will be scattered by the laser. The laser receiving circuit is used to receive the scattered laser signal and convert the detected laser signal into an electrical signal and send it to the main control unit. The main control unit sends the electrical signal to the terminal through the communication unit, and the supervisor can view the dust concentration of the implementation environment in real time through the terminal.

[0017] The working principle of the laser emission circuit is: when the power is turned on, the collector currents of transistor Q1 and transistor Q2 cannot be the same. Assuming that the collector current of transistor Q1 is greater than the collector current of transistor Q2, the first end of the feedback coil of transformer T1 is positive, providing base current for the base of transistor Q1, and transistor Q1 is turned on. Since the base of transistor Q2 is an inverted current, transistor Q2 is cut off, and a voltage is generated on the input coil of transformer T1. Therefore, an induced voltage is generated on the output coil of transformer T1. The voltage output by transformer T1 powers the laser emitter P1, and the laser emitter P1 emits a laser signal. When the transistor Q1 reaches saturation conduction, the induced electromotive force between the first input terminal of the transformer T1 and the third input terminal of the transformer T1 begins to decrease, generating an inverted magnetic flux, which causes the induced voltage on the feedback coil of the transformer T1 to reverse, that is, the base current of the transistor Q1 decreases in an inverted direction, and the base current of the transistor Q2 increases in a positive direction. After a period of time, the transistor Q1 is turned off, the transistor Q2 is turned on, and the collector current of the transistor Q2 begins to increase until the transistor Q2 enters a saturated conduction state, generating an inverted magnetic flux again, thereby turning off the transistor Q2 and turning on the transistor Q1 again, thereby forming an oscillation signal, generating a high-voltage excitation signal at both ends of the laser emitter P1, and causing the laser emitter P1 to emit a laser beam. Resistors R2 and R3 form a voltage divider circuit for detecting the operating voltage of the laser emitter P1. The voltage on resistor R3 is taken as the sampling voltage. When the operating voltage of the laser emitter P1 increases, the voltage on resistor R3 increases, thereby increasing the voltage at the inverting input terminal of the operational amplifier U4. The operational amplifier U4 forms a comparison amplifier circuit. The inverting input terminal of the operational amplifier U4 is connected to a stable Vref reference voltage. When the voltage at the inverting input terminal of the operational amplifier U4 increases, the output voltage of the operational amplifier U4 decreases, thereby reducing the base voltage of the transistor Q4, and then the collector current of the transistor Q4 decreases, thereby reducing the base current of the transistor Q1 or the transistor Q2, reducing the voltage on the input coil of the transformer T1, thereby reducing the voltage output by the transformer T1, and suppressing the increase in the operating voltage of the laser emitter P1. When the operating voltage of the laser emitter P1 becomes smaller, the voltage on the resistor R3 decreases, thereby reducing the voltage at the inverting input terminal of the operational amplifier U4, and the output voltage of the operational amplifier U4 increases, thereby increasing the base voltage of the transistor Q4, and then the collector current of the transistor Q4 increases, thereby increasing the base current of the transistor Q1 or the transistor Q2, and increasing the voltage on the input coil of the transformer T1, thereby increasing the voltage output by the transformer T1, and suppressing the operating voltage of the laser emitter P1 from becoming smaller.

[0018] Therefore, the present invention can change the current of the input coil of the transformer T1 by collecting the working voltage of the laser emitter P1, thereby adjusting the output voltage of the transformer T1, ensuring that the working voltage of the laser emitter P1 is stable and unchanged, avoiding the laser emitter P1 from being affected by the environment, thereby improving the stability of the laser beam emitted by the laser emitter P1. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 is a circuit diagram of a laser emission circuit provided by an embodiment of the present disclosure;

[0021] Figure 2 is a circuit diagram of a power buffer circuit provided by an embodiment of the present disclosure;

[0022] Figure 3 is a circuit diagram of a laser receiving circuit provided by an embodiment of the present disclosure;

[0023] Figure 4 is a circuit diagram of a filter circuit provided by an embodiment of the present disclosure;

[0024] Figure 5 is a circuit diagram of an ultrasonic transmitting circuit provided in an embodiment of the present disclosure;

[0025] Figure 6 is a circuit diagram of an ultrasonic receiving circuit provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0026] In order to enable people in the technical field to better understand the present solution, the technical solution in the embodiment of the present solution will be clearly described below in conjunction with the drawings in the embodiment of the present solution. Obviously, the described embodiment is an embodiment of a part of the present solution, not all of the embodiments. Based on the embodiments in the present solution, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present solution.

[0027] The term "including" and any other variations in the specification and claims of this solution and the above drawings mean "including but not limited to", and is intended to cover non-exclusive inclusions and is not limited to the examples listed in the text. In addition, the terms "first" and "second" are used to distinguish different objects, not to describe a specific order.

[0028] The following is a detailed description of the implementation of the present disclosure in conjunction with the specific drawings:

[0029] like Figure 1 As shown, this embodiment proposes an intelligent spray water curtain dust removal system, including a main control unit, a laser emitting circuit, a laser receiving circuit and a communication unit. The laser emitting circuit is used to emit laser signals, and the laser receiving circuit is used to receive laser signals. The laser receiving circuit is connected to the main control unit, and the main control unit is connected to the terminal by means of the communication unit. The laser emitting circuit includes transistor Q1, transistor Q2, capacitor C1, transformer T1, laser transmitter P1, resistor R2, resistor R3, operational amplifier U4, resistor R4 and transistor Q4; the first input end of the transformer T1 is connected to the collector of the transistor Q1, the second input end of the transformer T1 is connected to the collector of the transistor Q2, the third input end of the transformer T1 is connected to a 12V power supply, and the capacitor C1 is connected in parallel between the first input end of the transformer T1 and the second input end of the transformer T1; the third input end of the transformer T1 A feedback end is connected to the base of transistor Q1, a second feedback end of transformer T1 is connected to the base of transistor Q2, an emitter of transistor Q1 is grounded, an emitter of transistor Q2 is grounded, a first output end of transformer T1 is connected to the first end of laser emitter P1, a second end of laser emitter P1 is grounded, and a second output end of transformer T1 is grounded; a first end of resistor R2 is connected to the first end of laser emitter P1, a second end of resistor R2 is grounded through resistor R3, a second end of resistor R2 is connected to the inverting input end of operational amplifier U4, a non-inverting input end of operational amplifier U4 is connected to a Vref reference voltage, an output end of operational amplifier U4 is connected to the inverting input end of operational amplifier U4 through resistor R4, an output end of operational amplifier U4 is connected to the base of transistor Q4, a collector of transistor Q4 is connected to a 5V power supply, and an emitter of transistor Q4 is connected to the second feedback end of transformer T1. The oscillation frequency of the circuit can be changed by changing capacitor C1.

[0030] In this embodiment, the laser emitting circuit is used to emit a laser beam, which forms a detection area of ​​a certain diameter after passing through a lens. When dust particles in the air pass through the detection area, they will scatter the laser. The laser receiving circuit is used to receive the scattered laser signal and convert the detected laser signal into an electrical signal and send it to the main control unit. The main control unit sends the electrical signal to the terminal through the communication unit. The terminal in this embodiment can be a fixed terminal (computer) or a mobile terminal (mobile phone). Supervisors can view the dust concentration in the implementation environment in real time through the terminal.

[0031] Specifically, the working principle of the laser emission circuit is as follows: when working, the third input terminal of the transformer T1 is connected to a 12V DC power supply, and the transistor Q1 and the transistor Q2 are two identical NPN transistors. However, during the production process, the parameters of the transistor Q1 and the transistor Q2 cannot be completely consistent. Therefore, when the power is turned on, the collector currents of the transistor Q1 and the transistor Q2 cannot be the same. Assuming that the collector current of the transistor Q1 is greater than the collector current of the transistor Q2, the first end of the feedback coil of the transformer T1 is positive, providing a base current for the base of the transistor Q1, and the transistor Q1 is turned on. Since the base of the transistor Q2 is an inverted current, the transistor Q2 is turned off, and a voltage is generated on the input coil of the transformer T1. Therefore, an induced voltage is generated on the output coil of the transformer T1. The transformer T1 is a step-up transformer, and the voltage output by the transformer T1 is used to power the laser emitter P1, and the laser emitter P1 emits a laser signal. When the transistor Q1 reaches saturation conduction, the induced electromotive force between the first input terminal of the transformer T1 and the third input terminal of the transformer T1 begins to decrease, generating an inverted magnetic flux, which causes the induced voltage on the feedback coil of the transformer T1 to reverse, that is, the base current of the transistor Q1 decreases in an inverted direction, and the base current of the transistor Q2 increases in a positive direction. After a period of time, the transistor Q1 is turned off, the transistor Q2 is turned on, and the collector current of the transistor Q2 begins to increase until the transistor Q2 enters a saturated conduction state, generating an inverted magnetic flux again, thereby turning off the transistor Q2 and turning on the transistor Q1 again, thereby forming an oscillation signal, generating a high-voltage excitation signal at both ends of the laser emitter P1, and causing the laser emitter P1 to emit a laser beam.

[0032] If the working voltage of the laser emitter P1 changes, the intensity of the laser beam emitted by the laser emitter P1 will change. Resistors R2 and R3 form a voltage divider circuit for detecting the working voltage of the laser emitter P1. The voltage on resistor R3 is taken as the sampling voltage. When the working voltage of the laser emitter P1 increases, the voltage on resistor R3 increases, thereby increasing the voltage at the inverting input terminal of the operational amplifier U4. The operational amplifier U4 forms a comparison amplifier circuit. The inverting input terminal of the operational amplifier U4 is connected to a stable Vref reference voltage. When the voltage at the inverting input terminal of the operational amplifier U4 increases, the output voltage of the operational amplifier U4 decreases, thereby reducing the base voltage of the transistor Q4, and then the collector current of the transistor Q4 decreases, thereby reducing the base current of the transistor Q1 or the transistor Q2, reducing the voltage on the input coil of the transformer T1, thereby reducing the voltage output by the transformer T1, and suppressing the working voltage of the laser emitter P1 from increasing. When the operating voltage of the laser emitter P1 becomes smaller, the voltage on the resistor R3 decreases, thereby reducing the voltage at the inverting input terminal of the operational amplifier U4, and the output voltage of the operational amplifier U4 increases, thereby increasing the base voltage of the transistor Q4, and then the collector current of the transistor Q4 increases, thereby increasing the base current of the transistor Q1 or the transistor Q2, and increasing the voltage on the input coil of the transformer T1, thereby increasing the voltage output by the transformer T1, and suppressing the operating voltage of the laser emitter P1 from becoming smaller.

[0033] Therefore, this embodiment can change the current of the input coil of transformer T1 by collecting the working voltage of laser emitter P1, thereby adjusting the output voltage of transformer T1, ensuring that the working voltage of laser emitter P1 is stable, thereby improving the stability of the laser beam emitted by laser emitter P1.

[0034] The capacitor C2, the diode D1, the capacitor C3 and the diode D2 form a voltage doubler rectifier circuit for converting the alternating signal output by the transformer T1 into a direct current signal and improving the load carrying capacity.

[0035] like Figure 1 As shown, the laser emission circuit in this embodiment also includes an operational amplifier U2, a switch tube Q3 and an inductor L1. The second end of the resistor R2 is connected to the inverting input end of the operational amplifier U2, the non-inverting input end of the operational amplifier U2 is used to receive a triangular wave signal, the output end of the operational amplifier U2 is connected to the control end of the switch tube Q3, the first end of the inductor L1 is connected to the emitter of the transistor Q1, the first end of the inductor L1 is connected to the emitter of the transistor Q2, the second end of the inductor L1 is connected to the first end of the switch tube Q3, and the second end of the switch tube Q3 is grounded.

[0036] In this embodiment, the sampling voltage on the resistor R3 is also added to the inverting input terminal of the operational amplifier U2. The operational amplifier U2 constitutes a comparator. The in-phase input terminal of the operational amplifier U2 receives the triangular wave signal. After comparison, the operational amplifier U2 outputs a pulse signal. When the operational amplifier U2 outputs a high level, the switch tube Q3 is turned on and the circuit operates normally. When the operational amplifier U2 outputs a low level, the switch tube Q3 is turned off, there is no voltage signal in the input coil of the transformer T1, and the circuit stops working, thus forming a cycle. When the working voltage of the laser transmitter P1 increases, the high level time of the pulse signal output by the operational amplifier U2 in the same cycle is shortened, and the conduction time of the switch tube Q3 becomes shorter, thereby reducing the average voltage on the input coil of the transformer T1, and therefore, the voltage output by the transformer T1 decreases. When the working voltage of the laser transmitter P1 decreases, the high level time of the pulse signal output by the operational amplifier U2 in the same cycle increases, and the conduction time of the switch tube Q3 becomes longer, thereby increasing the average voltage on the input coil of the transformer T1, and the voltage output by the transformer T1 increases. Therefore, this embodiment can also adjust the operating voltage of the laser emitter P1 by changing the average voltage on the input coil of the transformer T1, thereby further improving the stability of the laser beam emitted by the laser emitter P1.

[0037] like Figure 2 As shown, the intelligent spray water curtain dust removal system in this embodiment also includes a power buffer circuit, which includes an inductor L2, a resistor R8, a capacitor C5, a capacitor C6 and a relay K1. The first end of the inductor L2 is connected to a 12V power supply, the second end of the inductor L2 is grounded through the capacitor C6, the second end of the inductor L2 is connected to the normally open end of the relay K1, the first end of the resistor R8 is connected to the 12V power supply, the second end of the resistor R8 is grounded through the capacitor C5, the second end of the resistor R8 is connected to the first input end of the relay K1, the second input end of the relay K1 is grounded, and the common end of the relay K1 is connected to the third input end of the transformer T1.

[0038] A large impact current will be generated at the moment of power-on, which will have a great impact on the transformer and the transistor. In the long run, the service life of the transformer or the transistor will be shortened. In order to reduce the impact of large current on the circuit, a power buffer circuit is added in this embodiment.

[0039] Specifically, the working principle of the buffer circuit is as follows: after the circuit is powered on, the 12V power supply charges the capacitor C5 through the resistor R8. As the voltage on the capacitor C5 gradually increases, the relay K1 is energized and attracted, and the common end of the relay K1 is connected to the normally open end of the relay K1. Due to the presence of the inductor L2, the transformer T1 will not be energized immediately. The inductor L2 plays a buffering role. The 12V voltage charges the capacitor C6 after passing through the inductor L2. After the normally open end of the relay K1 is connected, the voltage of the normally open end of the relay K1 slowly rises with the charging of the capacitor C6 until it reaches 12V, thereby avoiding the impact of the inrush current on the circuit.

[0040] like Figure 3 As shown, the laser receiving circuit in this embodiment includes a laser receiver P2, a resistor R9, a resistor R10, an operational amplifier U3, a variable resistor RP1, an operational amplifier U3 and a resistor R11. The first end of the laser receiver P2 is grounded through the resistor R9, the second end of the laser receiver P2 is grounded, the first end of the laser receiver P2 is connected to the in-phase input end of the operational amplifier U3 through the resistor R10, the inverting input end of the operational amplifier U3 is connected to the sliding end of the variable resistor RP1, the first end of the variable resistor RP1 is connected to a 5V power supply, the second end of the variable resistor RP1 is grounded, the output end of the operational amplifier U3 is connected to the inverting input end of the operational amplifier U3 through the resistor R11, and the output end of the operational amplifier U3 is connected to the first input end of the main control unit.

[0041] In this embodiment, the laser receiver P2 is used to receive scattered laser signals and convert the received laser signals into current signals for output. The higher the dust concentration in the measured environment, the stronger the scattered light signal received by the laser receiver P2, and the greater the output current. The current is converted into a voltage signal through the resistor R9, but the voltage signal is relatively weak and cannot be effectively recognized by the main control unit. For this reason, the operational amplifier U3 constitutes an amplification circuit for amplifying the voltage signal on the resistor R9. The output voltage of the operational amplifier U3 can be changed by changing the resistance value of the variable resistor RP1. Finally, the amplified voltage signal is converted into an electrical signal and sent to the first input terminal of the main control unit.

[0042] like Figure 4 As shown, in this embodiment, a filtering circuit is also included between the output end of the operational amplifier U3 and the first input end of the main control unit. The filtering circuit includes a resistor R12, a capacitor C10, a resistor R13, a capacitor C11, a resistor R14, an operational amplifier U5, a resistor R17 and a resistor R15. The first end of the resistor R12 is connected to the output end of the operational amplifier U3, the second end of the resistor R12 is grounded through the capacitor C10, the second end of the resistor R12 is connected to the in-phase input end of the operational amplifier U5 through the capacitor C11, the in-phase input end of the operational amplifier U5 is grounded through the resistor R14, the inverting input end of the operational amplifier U5 is grounded through the resistor R17, the output end of the operational amplifier U5 is connected to the inverting input end of the operational amplifier U5 through the resistor R15, the output end of the operational amplifier U5 is connected to the second end of the resistor R12 through the resistor R13, and the output end of the operational amplifier U5 is connected to the first input end of the main control unit.

[0043] In this embodiment, the laser signal detected by the laser receiver P2 is relatively weak, so the output current signal is also relatively weak, which is easily affected by environmental noise. At the same time, there are a lot of high-frequency interference signals in the electrical signal output by the operational amplifier U3, which will seriously affect the detection of environmental dust concentration. Therefore, in this embodiment, a filter circuit is added between the output end of the operational amplifier U3 and the first input end of the main control unit. It is used to filter out the noise and high-frequency interference signals in the electrical signal output by the operational amplifier U3, and finally send the filtered electrical signal to the main control unit.

[0044] like Figure 5 As shown, the intelligent spray water curtain dust removal system in this embodiment also includes an ultrasonic transmitting circuit and an ultrasonic receiving circuit, both of which are connected to the main control unit. The ultrasonic transmitting circuit includes a transformer T2, a switch tube Q5 and an ultrasonic transmitting probe X1. The first input end of the transformer T2 is connected to a 12V power supply, the second input end of the transformer T2 is connected to the first end of the switch tube Q5, the second end of the switch tube Q5 is grounded, the control end of the switch tube Q5 is connected to the first output end of the main control unit, the first output end of the transformer T2 is connected to the first end of the ultrasonic transmitting probe X1, the second output end of the transformer T2 is grounded, and the second end of the ultrasonic transmitting probe X1 is grounded.

[0045] In this embodiment, the dust concentration in the environment is detected by laser scattering. When the dust concentration exceeds the set value, the intelligent spray water curtain dust removal system starts to start the spray device to spray water mist into the air. During the spraying process, the spray device needs to draw water from the water tank and form water mist after passing through the atomizing nozzle. During dust removal, it is necessary to ensure that there is enough water in the water tank, otherwise it will affect the normal dust removal work. Therefore, a water level detection system is added in this embodiment.

[0046] The water level detection system consists of an ultrasonic transmitting circuit and an ultrasonic receiving circuit. The ultrasonic transmitting circuit is used to transmit ultrasonic signals. The ultrasonic signals are reflected when passing through the water surface, and then the ultrasonic echo signals are received by the ultrasonic receiving circuit. The water level in the water tank is judged based on the time taken from ultrasonic transmission to reception of the ultrasonic echo signal. When the water level in the water tank is lower than the set lower limit, the main control unit sends a signal to the terminal through the communication unit to notify the management personnel to fill the water tank in time.

[0047] Specifically, the working principle of the ultrasonic transmitting circuit is as follows: when working, the main control unit outputs a PWM control signal. When the PWM control signal is at a high level, the switch tube Q5 is turned on, and a voltage is generated in the input coil of the transformer T2. The transformer T2 is also a step-up transformer. An induced voltage is generated in the output coil of the transformer T2 and added to both ends of the ultrasonic transmitting probe X1. The ultrasonic transmitting probe X1 generates an ultrasonic signal. When the PWM control signal is at a low level, the switch tube Q5 is turned off, and the ultrasonic transmitting probe X1 stops transmitting the ultrasonic signal, thus forming a cycle.

[0048] like Figure 6 As shown, the ultrasonic receiving circuit in this embodiment includes an ultrasonic receiving probe X2, a capacitor C12, a resistor R21, a resistor R20, a transistor Q6, a resistor R22 and a resistor R23. The first end of the ultrasonic receiving probe X2 is connected to the base of the transistor Q6 through the capacitor C12, the second end of the ultrasonic receiving probe X2 is grounded, the base of the transistor Q6 is connected to a 5V power supply through the resistor R21, the base of the transistor Q6 is grounded through the resistor R20, the collector of the transistor Q6 is connected to the 5V power supply through the resistor R22, the emitter of the transistor Q6 is grounded through the resistor R23, and the collector of the transistor Q6 is connected to the second input end of the main control unit.

[0049] In the ultrasonic receiving circuit, the ultrasonic receiving probe X2 is used to receive the ultrasonic echo signal and convert the detected ultrasonic echo signal into an electrical signal for output. However, the electrical signal output by the ultrasonic receiving probe X2 is relatively weak. The transistor Q6 constitutes an amplification circuit. The electrical signal output by the ultrasonic receiving probe X2 is coupled by the capacitor C12 and sent to the base of the transistor Q6. After being amplified by the transistor Q6, it is sent to the second input end of the main control unit. The resistor R24, the capacitor C13, the resistor R25 and the capacitor C14 constitute a bandpass filter circuit, which is used to improve the stability of the electrical signal output by the transistor Q6, thereby improving the detection accuracy of the water level.

[0050] Furthermore, the intelligent spray water curtain dust removal system in this embodiment also includes a water pump control circuit. When dust removal is required, the main control unit will send a control instruction to the water pump control circuit, and the water pump control circuit will control the water pump to extract water from the water tank.

[0051] The above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. Intelligent spray water curtain dust removal system, characterized by: It includes a main control unit, a laser emitting circuit, a laser receiving circuit and a communication unit, wherein the laser emitting circuit is used to emit laser signals, the laser receiving circuit is used to receive laser signals, the laser receiving circuit is connected to the main control unit, and the main control unit is connected to the terminal by means of the communication unit, and the laser emitting circuit includes a transistor Q1, a transistor Q2, a capacitor C1, a transformer T1, a laser emitter P1, a resistor R2, a resistor R3, an operational amplifier U4, a resistor R4 and a transistor Q4; The first input end of the transformer T1 is connected to the collector of the transistor Q1, the second input end of the transformer T1 is connected to the collector of the transistor Q2, the third input end of the transformer T1 is connected to a 12V power supply, and the capacitor C1 is connected in parallel between the first input end of the transformer T1 and the second input end of the transformer T1; The first feedback end of the transformer T1 is connected to the base of the transistor Q1, the second feedback end of the transformer T1 is connected to the base of the transistor Q2, the emitter of the transistor Q1 is grounded, the emitter of the transistor Q2 is grounded, the first output end of the transformer T1 is connected to the first end of the laser emitter P1, the second end of the laser emitter P1 is grounded, and the second output end of the transformer T1 is grounded; The first end of the resistor R2 is connected to the first end of the laser emitter P1, the second end of the resistor R2 is grounded through the resistor R3, the second end of the resistor R2 is connected to the inverting input end of the operational amplifier U4, the non-inverting input end of the operational amplifier U4 is connected to the Vref reference voltage, the output end of the operational amplifier U4 is connected to the inverting input end of the operational amplifier U4 through the resistor R4, the output end of the operational amplifier U4 is connected to the base of the transistor Q4, the collector of the transistor Q4 is connected to a 5V power supply, and the emitter of the transistor Q4 is connected to the second feedback end of the transformer T1; The laser emission circuit further includes an operational amplifier U2, a switch tube Q3 and an inductor L1, the second end of the resistor R2 is connected to the inverting input end of the operational amplifier U2, the non-inverting input end of the operational amplifier U2 is used to receive a triangular wave signal, the output end of the operational amplifier U2 is connected to the control end of the switch tube Q3, the first end of the inductor L1 is connected to the emitter of the transistor Q1, the first end of the inductor L1 is connected to the emitter of the transistor Q2, the second end of the inductor L1 is connected to the first end of the switch tube Q3, and the second end of the switch tube Q3 is grounded; It also includes a power buffer circuit, which includes an inductor L2, a resistor R8, a capacitor C5, a capacitor C6 and a relay K1. The first end of the inductor L2 is connected to a 12V power supply, the second end of the inductor L2 is grounded through the capacitor C6, the second end of the inductor L2 is connected to the normally open end of the relay K1, the first end of the resistor R8 is connected to the 12V power supply, the second end of the resistor R8 is grounded through the capacitor C5, the second end of the resistor R8 is connected to the first input end of the relay K1, the second input end of the relay K1 is grounded, and the common end of the relay K1 is connected to the third input end of the transformer T1.

2. The intelligent spray water curtain dust removal system according to claim 1 is characterized in that: The laser receiving circuit includes a laser receiver P2, a resistor R9, a resistor R10, an operational amplifier U3, a variable resistor RP1, an operational amplifier U3 and a resistor R11. The first end of the laser receiver P2 is grounded through the resistor R9, the second end of the laser receiver P2 is grounded, the first end of the laser receiver P2 is connected to the in-phase input end of the operational amplifier U3 through the resistor R10, the inverting input end of the operational amplifier U3 is connected to the sliding end of the variable resistor RP1, the first end of the variable resistor RP1 is connected to a 5V power supply, the second end of the variable resistor RP1 is grounded, the output end of the operational amplifier U3 is connected to the inverting input end of the operational amplifier U3 through the resistor R11, and the output end of the operational amplifier U3 is connected to the first input end of the main control unit.

3. The intelligent spray water curtain dust removal system according to claim 2 is characterized in that: A filtering circuit is also included between the output end of the operational amplifier U3 and the first input end of the main control unit. The filtering circuit includes a resistor R12, a capacitor C10, a resistor R13, a capacitor C11, a resistor R14, an operational amplifier U5, a resistor R17 and a resistor R15. The first end of the resistor R12 is connected to the output end of the operational amplifier U3, the second end of the resistor R12 is grounded through the capacitor C10, the second end of the resistor R12 is connected to the non-inverting input end of the operational amplifier U5 through the capacitor C11, the non-inverting input end of the operational amplifier U5 is grounded through the resistor R14, the inverting input end of the operational amplifier U5 is grounded through the resistor R17, the output end of the operational amplifier U5 is connected to the inverting input end of the operational amplifier U5 through the resistor R15, the output end of the operational amplifier U5 is connected to the second end of the resistor R12 through the resistor R13, and the output end of the operational amplifier U5 is connected to the first input end of the main control unit.

4. The intelligent spray water curtain dust removal system according to claim 1 is characterized in that: It also includes an ultrasonic transmitting circuit and an ultrasonic receiving circuit, both of which are connected to the main control unit. The ultrasonic transmitting circuit includes a transformer T2, a switch tube Q5 and an ultrasonic transmitting probe X1. The first input end of the transformer T2 is connected to a 12V power supply, the second input end of the transformer T2 is connected to the first end of the switch tube Q5, the second end of the switch tube Q5 is grounded, the control end of the switch tube Q5 is connected to the first output end of the main control unit, the first output end of the transformer T2 is connected to the first end of the ultrasonic transmitting probe X1, the second output end of the transformer T2 is grounded, and the second end of the ultrasonic transmitting probe X1 is grounded.

5. The intelligent spray water curtain dust removal system according to claim 4 is characterized in that: The ultrasonic receiving circuit includes an ultrasonic receiving probe X2, a capacitor C12, a resistor R21, a resistor R20, a transistor Q6, a resistor R22 and a resistor R23. The first end of the ultrasonic receiving probe X2 is connected to the base of the transistor Q6 through the capacitor C12, the second end of the ultrasonic receiving probe X2 is grounded, the base of the transistor Q6 is connected to a 5V power supply through the resistor R21, the base of the transistor Q6 is grounded through the resistor R20, the collector of the transistor Q6 is connected to the 5V power supply through the resistor R22, the emitter of the transistor Q6 is grounded through the resistor R23, and the collector of the transistor Q6 is connected to the second input end of the main control unit.

Images