Dust control device for coal preparation plant roads

Abstract

This invention relates to a dust control device for coal preparation plant roads, encompassing the technical field of dust control equipment. It includes a submersible pump, solenoid valves, a detection module, a water storage tank, and connecting pipes. It also features a control circuit and a turbidity detection trigger circuit. The water storage tank is installed below ground level on one side of the road, with the submersible pump housed inside. The connecting pipe is horizontally installed on the other side of the road. The front end of the connecting pipe has multiple flushing pipes, and the upper and lower ends each have branch pipes. Two of the branch pipes are fixedly connected to one end of two solenoid valves, and the other ends of the solenoid valves are connected to the drain pipe of the submersible pump and a tap water pipe, respectively. A support pipe is installed on the connecting pipe. The detection module, turbidity detection trigger circuit, and control circuit are housed in a component box and electrically connected. The component box is mounted on the support pipe. This invention can automatically flush the road with tap water or a submersible pump, saving production costs. Furthermore, the flushing water can be reused after sedimentation, minimizing water waste.

Description

Technical Field

[0001] This utility model relates to the technical field of dust control equipment, and in particular to a dust control device for roads in coal preparation plants. Background Technology

[0002] A coal preparation plant is an industrial facility that processes raw coal using physical and chemical methods. Its core function is to remove mineral impurities such as gangue, ash, and sulfur-containing substances, separating the raw coal into different grades of products, including clean coal, lump coal, middlings, and coal slime. Based on user needs, they can be divided into coking coal preparation plants and thermal coal preparation plants. Coking coal plants produce low-ash clean coal for coking, while thermal coal plants supply fuel to the power generation and chemical industries.

[0003] In reality, coal mines and coal preparation plants are usually some distance apart, requiring vehicles to transport raw coal to the preparation area. When raw coal and finished products are transported on factory roads, in summer, the hot weather causes rapid evaporation of ground moisture. Furthermore, the repeated crushing of lumpy and granular coal by large vehicles (trucks) and the scattered fine coal ash easily create heavy dust pollution in the air, causing dust levels to exceed standards. In winter, high humidity and low temperatures prevent ground moisture from evaporating easily. This moisture mixes with the aforementioned substances (lumpy and granular coal crushed by vehicles and scattered coal ash), forming a paste-like substance (sticky coal sludge) on the ground. If not washed away promptly, this paste adheres to vehicle tires and carries the pollutants elsewhere (such as on national highways) during vehicle operation, causing further pollution. Therefore, coal dust spilled on the ground during the transportation of raw coal and finished products must be dealt with promptly. In existing technologies, road surfaces are typically cleaned and washed manually by staff at relevant locations. This method is inconvenient for staff, increases their workload, and results in higher production costs. Therefore, it is essential to provide a device that can automatically wash road surfaces and reduce air pollution caused by dust. Utility Model Content

[0004] To overcome the drawbacks of existing coal preparation plants where road surface cleaning is done manually during the transportation of raw coal and finished products (sorted coal), which causes inconvenience to workers, increases their labor intensity, and raises production costs, this utility model provides a dust control device specifically designed for coal transportation roads. With the combined action of relevant mechanisms, the device automatically washes the road surface with pressurized water at regular intervals after each vehicle passes a designated location. The washing water can be reused, minimizing water waste. This provides convenience to workers and correspondingly saves on production costs.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A dust control device for coal preparation plant roads includes a submersible pump, solenoid valves, a detection module, a water tank, and connecting pipes. It also includes a control circuit and a turbidity detection trigger circuit. The water tank is installed below ground level on one side of the road, and the submersible pump is located inside the tank. An overflow pipe is installed on one side of the upper end of the water tank, and the other side of the overflow pipe is connected to a wastewater treatment tank via a pipeline. The connecting pipe is horizontally fixedly installed on the other side of the road. Multiple flushing pipes are installed at intervals on the front end of the connecting pipe. There are at least two solenoid valves. Branch pipes are fixedly installed at the upper and lower ends of the connecting pipe, and the other ends of the two branch pipes are fixedly connected to one end of each of the two solenoid valves. The other ends of the two solenoid valves are fixedly connected to the drain pipe of the submersible pump and the tap water pipe, respectively. A support pipe is fixedly installed on the connecting pipe. The detection module, turbidity detection trigger circuit, and control circuit are installed in the component box. The component box is fixedly installed on the support pipe, and the detection head of the detection module is aligned with one side of the road surface. The signal output terminal of the detection module is electrically connected to the signal input terminal of the control circuit. The power input terminal of the turbidity detection trigger circuit is electrically connected to the power output terminal of the control circuit. The multiple control power output terminals of the turbidity detection trigger circuit are electrically connected to the power input terminals of the submersible pump and the two solenoid valves, respectively.

[0007] Furthermore, the solenoid valve is a normally closed valve core solenoid valve.

[0008] Furthermore, the upper part of the water storage tank is lower than the height of the road side.

[0009] Furthermore, the lower end of the flushing pipe and the upper end of the road surface are on the same plane, the water outlet of the flushing pipe is aligned with one side of the road, and the lateral length of the connecting pipe is the same as the length of the water storage tank.

[0010] Furthermore, the detection module is higher than the height of a human body but lower than the height of a coal transport vehicle. The detection module is equipped with a reflector, which is fixedly installed on a support frame on the side of the water storage tank near the road. The beam of light emitted by the transmitter of the detection module shines on the reflector.

[0011] Furthermore, the control circuit includes an electrically connected relay and a time relay module. The relay control power input terminal is connected to the positive power input terminal of the time relay module, the power output terminal of the time relay module is connected to the positive power input terminal of the relay, and the negative power input terminal and negative control signal input terminal of the time relay module are connected to the negative power input terminal of the relay.

[0012] Furthermore, the turbidity detection trigger circuit includes an electrically connected resistor, a phototransistor, a light-emitting diode, a transistor, a relay, and a water level switch. One end of the first resistor, one end of the second resistor, and the control power input terminal of the first relay are connected to one end of the water level switch. The other end of the water level switch is connected to the positive power input terminal of the first relay. The other end of the first resistor is connected to the positive terminal of the light-emitting diode. The other end of the second resistor is connected to the collector of the phototransistor. The collector of the phototransistor is connected to one end of the third resistor. The other end of the third resistor is connected to one end of the fourth resistor and one end of the fifth resistor. The collector of the transistor is connected to the negative power input terminal of the first relay. The normally open contact of the first relay is connected to the positive power input terminal of the second relay. The other end of the fourth resistor is connected to the emitter of the transistor and the negative power input terminal of the second relay.

[0013] Furthermore, the light-emitting diode and the phototransistor are respectively sealed and installed in two housings. The two housings are respectively fixedly installed on the front side of the upper end of the submersible pump housing, and the light-emitting surface of the light-emitting diode and the light-receiving surface of the phototransistor are horizontally facing each other. The water level switch is fixedly installed in the water tank and is higher than the height of the submersible pump.

[0014] The beneficial effects of this utility model are as follows: Before its actual application, a corresponding number of these models are installed continuously or at intervals on both sides of the relevant road surface. In actual application, whenever a vehicle passes through the corresponding road surface and is detected by the detection module, under the action of the control circuit and the turbidity detection trigger circuit, pressurized water can be automatically output through a submersible pump or tap water pipe at certain intervals to wash the road surface. Moreover, after the water settles, the washing water can be reused, minimizing water waste. This brings convenience to the staff and saves production costs accordingly. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0017] Figure 2 This is the circuit diagram of this utility model. Detailed Implementation

[0018] Figure 1 , 2As shown, the dust control device for coal preparation plant roads includes a power module W1, a submersible pump M, solenoid valves DC1 and DC2, a detection module W2, a water storage tank 1, and a connecting pipe 2. It also includes a control circuit 3 and a turbidity detection trigger circuit 4. The water storage tank 1 is installed below ground level on one side of the road. The submersible pump M is mounted on a fixed platform 102 in the middle left of the water storage tank. An overflow pipe 101 (with the inlet lower than the top of the water storage tank 1) is installed on the upper left side of the water storage tank. The other side of the overflow pipe 101 is connected to a wastewater treatment tank (not shown in the figure) via a pipeline (when the water in the storage tank is full, it flows into the wastewater treatment tank through the overflow pipe 101 for treatment; the treated water is then used for other purposes in coal mine production). The connecting pipe 2 is horizontally fixed on the ground on the other side of the road. Both ends of the connecting pipe 2 are closed structures, and the front ends are spaced apart. The device is equipped with multiple flushing pipes 21 (with an inner diameter smaller than that of the connecting pipe 2), and at least two solenoid valves. A branch pipe 22 is fixedly installed at the upper and lower ends of the middle section of the connecting pipe 2. The other ends of the two branch pipes 22 are fixedly connected to one end of the two solenoid valves DC1 and DC2, respectively. The other end of the lower solenoid valve DC2 is fixedly connected to the drain pipe of the submersible pump M via a connecting pipe 5. The other end of the upper solenoid valve DC1 is fixedly connected to the tap water pipe via a pipe. A support pipe 23 with a height of two meters is fixedly installed at the upper outer end of the middle section of the connecting pipe 2. The detection module W2, the turbidity detection trigger circuit 4, the power module W1, and the control circuit 3 are installed on the circuit board inside the component box 6. The rear end of the component box 6 is fixedly installed on the support pipe 23, and the detection head of the detection module W2 is located outside the opening on one side of the component box 5 and aligned with one side of the road surface.

[0019] Figure 1 , 2As shown, solenoid valves DC1 and DC2 are normally closed solenoid valves. The upper side of the water tank 1 is slightly lower than the side of the road, and the upper side of the water tank 1 is in contact with the side of the road. The lower end of the flushing pipe 21 is on the same plane as the upper end of the road surface, and the outlet end of the flushing pipe 21 is aligned with the side of the road. The lateral length of the connecting pipe 2 is the same as the length of the water tank 1. The connecting pipe 2 is located below the road surface and is pre-buried in the lower end of the road during road construction (the wires connecting the submersible pump, LED VL, phototransistor T1, and water level switch S1 are encased in an insulating rubber tube, which is pre-buried below the road surface). The height of the detection module W2 is higher than the height of a human body but lower than the height of the coal transport vehicle. The detection module W2 is an infrared sensor, and the infrared sensor is equipped with a reflector 7. The reflector 7 is fixedly installed on the support frame 8 of the water tank near the side of the road. The reflector 7 and the emitting head of the infrared sensor W2 are on the same plane laterally, and the beam of light emitted by the emitting head of the infrared sensor W2 shines directly on the reflector 7. The control circuit includes relay J2 and time relay module W3 connected via circuit board wiring. The control power input terminal of relay J2 is connected to pin 1 of the positive power input terminal of time relay module W3. The power output terminal (pin 5) of time relay module W2 is connected to the positive power input terminal of relay J2. The negative power input terminal (pin 2) and negative control signal input terminal (pin 4) of time relay module W2 are connected to the negative power input terminal of relay J2. The turbidity detection trigger circuit includes resistors R1, R2, R3, R4, and R5, phototransistor VL, LED T1, transistor T2, relays J1 and J3, and a water level switch S1, all connected via circuit board wiring. One end of the first resistor R1 and one end of the second resistor R2 are connected to the control power input terminal of the first relay J1 and one end of the water level switch S1. The other end of the water level switch S1 is connected to the positive power input terminal of the first relay J1. The other end of the first resistor R1 is connected to the positive terminal of LED VL. The other end of the second resistor R2... The collector of phototransistor T1 is connected to the collector of phototransistor T1. The collector of phototransistor T1 is connected to one end of the third resistor R3. The other end of the third resistor R3 is connected to one end of the fourth resistor R4 and one end of the fifth resistor R5. The collector of transistor T2 is connected to the negative power input terminal of the first relay J1. The normally open contact of the first relay J1 is connected to the positive power input terminal of the second relay J3. The other end of the fourth resistor R4 is connected to the emitter of transistor T2, the negative power input terminal of the second relay J3, and the negative power input terminal of LED VL.LED L1 and phototransistor T1 are respectively sealed and installed in two housings 9, with the light-emitting surface of LED L1 and the light-receiving surface of phototransistor T1 respectively sealed and located on the outside of the two housings 9. The rear side of the two housings 9 are respectively fixedly installed on the middle of the upper front side of the submersible pump M housing, with the light-emitting surface of LED L1 and the light-receiving surface of phototransistor T1 horizontally facing each other (1 cm apart). The water level switch S1 is fixedly installed in the middle of the water tank and is higher than the height of the submersible pump M.

[0020] Figure 1 , 2 As shown, the two control power input terminals of relay J3 in the turbidity detection trigger circuit, the power input terminals 1 and 2 of power module W1, and the two poles of the 220V AC power supply are connected by wires. The power output terminals 3 and 4 of power module W1, the power input terminals 1 and 2 of detection module W2, the control power input terminal of relay J2 in the control circuit, and the negative power input terminal are connected by wires. The signal output terminal 3 of detection module W2, the signal input terminal of control circuit, and the positive control signal input terminal 3 of time relay module W3 are connected by wires. One end of resistor R1 in the power input terminal of turbidity detection trigger circuit, the emitter of transistor T2, the normally open contact of relay J2 in the power output terminal of control circuit, and the negative power input terminal are connected by wires. The two normally open contacts of relay J3 in the control power output terminal of turbidity detection trigger circuit are connected by wires to the two power input terminals of submersible pump M. The normally closed contact of relay J1, the emitter of transistor T2, and the power input terminal of solenoid valve DC1 are connected by wires. The normally open power output terminal of relay J1, the emitter of transistor T2, and the power input terminal of solenoid valve DC2 are connected by wires.

[0021] Figure 1 , 2As shown, before practical application (mainly for use on roads in coal mine raw coal and coal preparation areas), a corresponding number of these new models are installed continuously or at intervals on both sides of the relevant road surface to seamlessly wash the relevant road surface. After the 220V AC power enters the power input terminal of the power module W1, the 3rd and 4th pins of the power module W1 output a stable 12V DC power supply, which enters the power input terminal of the detection module and control circuit. When no vehicle passes through the corresponding area, the beam emitted by the detector head of the detection module W2 directly shines on the reflector 7. Therefore, the 3rd pin of the detection module W2 does not output a high level, the 5th pin of the corresponding time relay module W2 does not input a high level signal, the relay J2 will not be energized and engaged, the solenoid valves DC1 and DC2, and the submersible pump M will not be energized and operate, and the flushing pipe 21 will not wash the road surface. When a vehicle passes through the designated area, the beam emitted by the detector head of the detection module W2 (maximum detection distance 20 meters) is blocked by the vehicle and no longer directly illuminates the reflector 7. Then, pin 3 of the detection module W2 outputs a high-level signal to pin 3 of the time relay module W3. Pin 5 of the time relay module W3 outputs a high-level signal at regular intervals (e.g., 15 seconds of power output every 4 seconds; the actual time is adjustable, with the 4-second interval serving as the washing area before the vehicle leaves the front end of the connecting pipe's flushing pipe), which is then input to the positive power input terminal of the relay J2. Thus, every 4 seconds, the relay J2 is energized, closing its control power input terminal and normally open contact for 15 seconds, energizing the turbidity detection trigger circuit. Therefore, each time a coal transport vehicle passes through the designated area, the turbidity detection trigger circuit will be energized every 4 seconds for 15 seconds, subsequently controlling the flushing pipe to wash the road surface.

[0022] Figure 1 , 2As shown, after the turbidity detection trigger circuit is powered on, if there is no water in the water storage tank 1 or the water level is lower than the float of the water level switch S1, the internal contacts of the water level switch S1 will open, and the relay J1 will lose power and not engage. In this way, the 12V power supply will enter the power input terminal of the solenoid valve DC1 through the control power input terminal and normally closed contact terminal of the relay J1. Then, the solenoid valve DC1 is energized and the valve core opens. Within 15 seconds, pressurized tap water is sprayed from multiple flushing pipes from the other side of the road to one side, seamlessly flushing the fly ash and other debris on the road. After flushing, the dirty water enters the water storage tank 1. After the turbidity detection trigger circuit is energized, if there is water in the water storage tank 1 and the water level is higher than the float of the water level switch S1, the internal contacts of the water level switch S1 will close. Then, the relay J1 will be energized and its control power input terminal and normally open contact terminal will close, while its control power input terminal and normally closed contact terminal will open. In this way, the 12V power supply will no longer enter the power input terminal of the solenoid valve DC1 through the control power input terminal and normally closed contact terminal of the relay J1. As a result, the solenoid valve DC1 will be de-energized and the valve core will close, and the tap water will no longer wash the fly ash and other debris on the road. After the relay J1 is energized and the solenoid valve DC2 will be energized and the valve core will open. At the same time, the relay J3 will be energized and its control power input terminal and normally open contact terminal will close. Then, the submersible pump M will be energized and will pump the water in the water storage tank through the pipe into the connecting pipe 21. Then, it will be sprayed out from the other side of the road through multiple flushing pipes to one side, seamlessly washing the fly ash and other debris on the road. After washing, the dirty water will enter the water storage tank 1.

[0023] Figure 1 , 2As shown, after the turbidity detection trigger circuit is powered on, if the water level in the tank is high and the coal powder in the water has settled and the water quality is relatively clear, the light emitted by the LED VL (with resistor R1 acting as a voltage reducer and current limiter) is relatively strong and is received by the light-receiving surface of the phototransistor T1. Thus, the internal resistance of the phototransistor T1 is relatively small. The high-level output from the emitter of the 12V power supply through the phototransistor T1 (with resistor R2 acting as a voltage reducer and current limiter) is divided by resistors R3 and R4, and after being reduced in voltage and limited in current by resistor R5, it enters the base of the transistor T2, where the voltage is higher than 0.7V. The collector of the transistor T2 conducts, outputting a low-level signal that enters the negative power input terminal of the relay J1. The relay J1 is energized and engages, controlling the power input terminal and the normally open contact. When the terminal is closed, relay J3 and solenoid valve DC2 are energized. Subsequently, the submersible pump and solenoid valve DC2 work together to supply water to clean the road surface, while tap water is not supplied. (During production, by selecting resistors R4 with different resistance values, the threshold for transistor T2 to conduct can be set, which means that the submersible pump, etc., will supply water to the flushing pipe when the water turbidity is high or low. Specifically, when the resistance value of resistor R4 is relatively low, the voltage drop between it and resistor R3 is small, so the submersible pump will be energized to supply water to the flushing pipe when the water quality in the tank is relatively clear; when the resistance value of resistor R4 is relatively high, the voltage drop between it and resistor R3 is large, so the submersible pump can be energized to supply water to the flushing pipe when the water quality in the tank is relatively high.) After the turbidity detection trigger circuit is powered on, if the water level in the tank is high but the turbidity is high, the light beam emitted by the LED VL is relatively weak and is received by the light-receiving surface of the phototransistor T1. In this case, the internal resistance of the phototransistor T1 is relatively high. The high level output from the emitter of the 12V power supply is divided by resistors R3 and R4, and after being reduced and current-limited by resistor R5, it enters the base of the transistor T2, which is below 0.7V. The collector of the transistor T2 is cut off and no longer outputs a low level to the negative power input terminal of the relay J1. Therefore, the relays J1 and J3 and the solenoid valve DC2 will not be powered. Subsequently, the submersible pump and the solenoid valve DC2 will not supply water to clean the road surface, while the tap water supply will clean the road surface.

[0024] Figure 1 , 2 As shown, through all the above technical solutions, in the practical application of this new invention, whenever a vehicle passes over the corresponding road surface, pressurized water can be automatically output through a submersible pump or tap water pipe at certain intervals to wash the road surface. Moreover, after the water settles, the washing water can be reused, minimizing water waste, thereby bringing convenience to the staff and saving production costs accordingly. Figure 2In this circuit, power module W1 is a finished product of AC 220V to DC 12V power module; relays J1, J2, and J3 are DC 12V; solenoid valves DC1 and DC2 are normally closed valve core solenoid valves with a power of 2W; transistor T2 is a 9013 (NPN type); submersible pump M has a power of 1.5KW; water level switch S1 is a finished product of normally open contact float water level switch; resistors R1, R2, R3, R4, and R5 have resistance values ​​of 1.8KΩ, 68KΩ, 4.7KΩ, 1.2KΩ, and 100Ω respectively; time relay module W3 is a finished product of YourCee brand time controller module, which has two power input terminals (pins 1 and 2), two trigger signal input terminals (pins 3 and 4), one setting button, one emergency stop button, one time increment button, one time decrement button, one normally open power output terminal (pin 5), and one normally closed... The device has 7 contact pins (floating) and one 6-pin control power input pin (connected to pin 1). After pressing the setting button, the time increment and decrement buttons can be operated to set the time period for outputting positive power at the normally open power output pin. Once the time is set, the time relay module will start timing after each trigger signal input to the two trigger signal input pins. The infrared sensor W2 is an E3F-R20C1 NPN normally open infrared sensor with two power input pins and one power output pin. When the infrared beam emitted by its transmitter directly illuminates the reflector, the power output pin does not output power. When an object blocks the infrared beam emitted by the reflector and the transmitter, the power output pin outputs power. The LED VL is a BT401 infrared LED. The phototransistor T1 is a 3DU4.

[0025] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0026] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A dust control device for roads in coal preparation plants, comprising a submersible pump, a solenoid valve, a detection module, a water storage tank, and connecting pipes, characterized in that: It also includes a control circuit and a turbidity detection trigger circuit. The water storage tank is installed below ground level on one side of the road, and the submersible pump is located inside the water storage tank. An overflow pipe is installed on one side of the upper end of the water storage tank, and the other side of the overflow pipe is connected to the wastewater treatment tank via a pipeline. The connecting pipe is horizontally fixedly installed on the other side of the road. Multiple flushing pipes are installed at intervals on the front end of the connecting pipe. There are at least two solenoid valves. Branch pipes are fixedly installed at the upper and lower ends of the connecting pipe. The other side of the two branch pipes is fixedly connected to one end of the two solenoid valves, and the other end of the two solenoid valves is fixedly connected to the drain pipe of the submersible pump and the tap water pipe, respectively. A support pipe is fixedly installed on the connecting pipe. The detection module, the turbidity detection trigger circuit, and the control circuit are installed in a component box. The component box is fixedly installed on the support pipe, and the detection head of the detection module is aligned with one side of the road surface. The signal output terminal of the detection module is electrically connected to the signal input terminal of the control circuit. The power input terminal of the turbidity detection trigger circuit is electrically connected to the power output terminal of the control circuit. Multiple control power output terminals of the turbidity detection trigger circuit are electrically connected to the power input terminals of the submersible pump and the two solenoid valves, respectively.

2. The dust control device for coal preparation plant roads according to claim 1, characterized in that, The solenoid valve is a normally closed solenoid valve with a spool.

3. The dust control device for coal preparation plant roads according to claim 1, characterized in that, The top of the water tank is lower than the side of the road.

4. The dust control device for coal preparation plant roads according to claim 1, characterized in that, The lower end of the flushing pipe is on the same plane as the upper end of the road surface, the water outlet of the flushing pipe is aligned with one side of the road, and the lateral length of the connecting pipe is the same as the length of the water storage tank.

5. The dust control device for coal preparation plant roads according to claim 1, characterized in that, The detection module is taller than a human body but shorter than a coal transport vehicle. The detection module is equipped with a reflector, which is fixedly installed on a support frame on the side of the water tank near the road. The beam of light emitted from the transmitter of the detection module shines on the reflector.

6. The dust control device for coal preparation plant roads according to claim 1, characterized in that, The control circuit includes an electrically connected relay and a time relay module. The relay control power input terminal is connected to the positive power input terminal of the time relay module, the power output terminal of the time relay module is connected to the positive power input terminal of the relay, and the negative power input terminal and negative control signal input terminal of the time relay module are connected to the negative power input terminal of the relay.

7. The dust control device for coal preparation plant roads according to claim 1, characterized in that, The turbidity detection trigger circuit includes electrically connected resistors, a phototransistor, a light-emitting diode, a transistor, a relay, and a water level switch. One end of the first resistor, one end of the second resistor, and the control power input terminal of the first relay are connected to one end of the water level switch. The other end of the water level switch is connected to the positive power input terminal of the first relay. The other end of the first resistor is connected to the positive terminal of the light-emitting diode. The other end of the second resistor is connected to the collector of the phototransistor. The collector of the phototransistor is connected to one end of the third resistor. The other end of the third resistor is connected to one end of the fourth resistor and one end of the fifth resistor. The collector of the transistor is connected to the negative power input terminal of the first relay. The normally open contact of the first relay is connected to the positive power input terminal of the second relay. The other end of the fourth resistor is connected to the emitter of the transistor and the negative power input terminal of the second relay.

8. The dust control device for coal preparation plant roads according to claim 7, characterized in that, The light-emitting diode and the phototransistor are respectively sealed and installed in two housings. The two housings are fixedly installed on the front side of the upper end of the submersible pump housing, and the light-emitting surface of the light-emitting diode and the light-receiving surface of the phototransistor are horizontally facing each other. The water level switch is fixedly installed in the water tank and is higher than the height of the submersible pump.

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