Bulk material conveying dust suppression method and device

Abstract

The invention provides a dust suppression method and device for bulk material conveying, and belongs to the technical field of bulk material conveying. The method comprises the steps that when bulk materials are conveyed to the middle of a belt conveyor, spraying is conducted on the bulk materials through a middle spraying unit; when the bulk materials are conveyed to the tail end of the belt conveyor, the tail end spraying unit sprays the unloaded bulk materials, and water seeping from the belt conveyor and the bulk material hopper is recycled into the water purification tank through the return water collecting unit. According to the dust suppression method and device for bulk material conveying, the spraying units are arranged in the middle and at the tail end of the belt conveyor, the bulk materials are subjected to spraying treatment, water mist wraps dust to form large particles, then the particles are settled and deposited on the conveyor and the hopper, flying of the dust is remarkably reduced, the working environment is improved, and the working efficiency is improved. And the influence on the health of operators is reduced. Seeping water is recycled into the water purifying tank through the backwater collecting unit, so that cyclic utilization of water resources is realized, the water resources are saved, and wastewater discharge is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of bulk material conveying, and in particular to a method and device for suppressing dust during bulk material conveying. Background Art

[0002] Bulk material conveying system is a system used to transport powdered or granular bulk materials, which is widely used in industries such as industry and mining. In bulk material conveying system, dust removal is an important link, because bulk materials may generate dust during the conveying process, which not only pollutes the environment, but also poses a threat to the health of operators. At present, the conventional dust removal method of bulk material conveying system is to use a ventilator to suck the dust-containing gas into the pulse bag dust collector; wherein, the dust is adsorbed on the knitted bag of the dust collector, and the clean air is discharged to the outdoor air; the periodic pulse spraying technology is used to use high-pressure air to blow back into the filter medium briefly and forcefully to remove the dust attached to the filter bag; the dust falls back into the ash hopper and is finally discharged to the belt conveyor of the original conveying system.

[0003] Although the purpose of dust removal can be achieved, it has disadvantages such as high energy consumption, high cost and noise pollution.

[0004] Therefore, there is an urgent need for a low-cost and high-efficiency bulk material conveying and dust suppression method and device. Summary of the invention

[0005] The object of the present invention is to provide a method and device for suppressing dust during bulk material transportation, so as to solve at least one technical problem existing in the prior art.

[0006] The present invention protects a method for suppressing dust in bulk material transportation, comprising conveying the bulk material to be conveyed in a silo to a belt conveyor;

[0007] When the bulk material is conveyed to the middle of the belt conveyor, the bulk material is sprayed by the middle spray unit, and the dust in the bulk material is wrapped by the water mist and forms large dust particles and then settles on the belt conveyor;

[0008] According to the running direction of the belt conveyor, when the bulk material is conveyed to the end of the belt conveyor, the bulk material falls and is unloaded into the bulk material hopper; the terminal spray unit sprays the bulk material being unloaded, and the dust in the bulk material is wrapped by the water mist and forms large dust particles and then settles into the bulk material hopper; wherein the terminal spray unit is arranged above the bulk material hopper;

[0009] The water seeping from the belt conveyor and bulk material hopper is recovered into the clean water tank through the return water collection unit.

[0010] Furthermore, a preferred method further comprises: disposing a vibrating flow aid above the discharge port of the silo; and setting the vibration frequency of the vibrating flow aid according to the type of bulk material to be transported.

[0011] Furthermore, a preferred method is to detect the water level in the clean water tank using a liquid level sensor provided in the clean water tank; when the water level in the clean water tank is lower than a set threshold, to replenish the water in the clean water tank to the set water level using a replenishment pump.

[0012] Furthermore, a preferred method is to detect the temperature in the clean water tank using a temperature sensor provided in the clean water tank; when the water temperature in the clean water tank is lower than a set temperature, heating the water in the clean water tank to the set temperature using a heating unit.

[0013] Further, the preferred method is to pump water from the clean water tank into the middle spray water suction pipe through the middle dust suppression water pump of the middle spray unit;

[0014] The water output of the spray head assembly of the middle spray unit is controlled by a pressure transmitter and an electric control valve arranged on the water suction pipe to the middle spray unit.

[0015] Furthermore, a preferred method is that the nozzle assembly of the middle spray unit includes more than two nozzles arranged in an array.

[0016] Further, a preferred method is to provide a middle bulk material induction sensor at the middle of the belt conveyor;

[0017] When the middle bulk material sensing sensor senses that bulk material is passing through the middle of the belt conveyor, the middle spray unit is triggered to spray the bulk material.

[0018] Further, a preferred method is to provide an end bulk material sensing sensor at the end of the belt conveyor;

[0019] When the terminal bulk material sensing sensor senses that bulk material passes through the terminal of the belt conveyor, the terminal spray unit is triggered to spray the bulk material.

[0020] Furthermore, a preferred method is that the control unit realizes automated spray dust removal for the bulk material conveying unit by controlling the vibration flow aid, liquid level sensor, heating unit, water replenishment pump, middle bulk material sensing sensor, end bulk material sensing sensor, pressure transmitter and electric control valve.

[0021] The present invention also includes a bulk material conveying and dust suppression device, the device comprising:

[0022] A conveying module is used to convey the bulk materials to be conveyed in the silo to the belt conveyor;

[0023] A middle spray module is used for spraying the bulk material through the middle spray unit when the bulk material is transported to the middle of the belt conveyor, so that the dust in the bulk material is wrapped by the water mist and forms large dust particles and then settles on the belt conveyor;

[0024] The terminal spray module is used for spraying the bulk material being unloaded to the bulk material hopper at the end of the belt conveyor when the bulk material is transported to the end of the belt conveyor according to the running direction of the belt conveyor, so that the dust in the bulk material is wrapped by the water mist and forms large dust particles and then settles in the bulk material hopper; wherein the terminal spray unit is arranged above the bulk material hopper;

[0025] The return water module is used to recycle the water seeping from the belt conveyor and bulk material hopper into the clean water tank through the return water collection unit.

[0026] As described above, the bulk material conveying dust suppression method and device of the present invention include conveying the bulk material to be conveyed in the silo to the belt conveyor; when the bulk material is conveyed to the middle of the belt conveyor, the bulk material is sprayed by the middle spray unit, and the dust in the bulk material is wrapped by water mist and forms large dust particles and then settles on the belt conveyor; according to the running direction of the belt conveyor, when the bulk material is conveyed to the end of the belt conveyor, the bulk material falls and is unloaded into the bulk material hopper; the end spray unit sprays the bulk material being unloaded, and the dust in the bulk material is wrapped by water mist and forms large dust particles and then settles into the bulk material hopper; wherein the end spray unit is arranged above the bulk material hopper; the water seeping from the belt conveyor and the bulk material hopper is recovered into the clean water tank through the return water collection unit. The bulk material conveying dust suppression method and device of the present invention provides a spray unit at the middle and end of the belt conveyor to spray the bulk material, and uses water mist to wrap the dust to form larger particles, which then settle and deposit on the conveyor and hopper, significantly reducing the flying of dust, improving the working environment, and reducing the impact on the health of operators. The seepage water is recovered into the clean water tank through the return water collection unit, realizing the recycling of water resources, saving water resources, and reducing wastewater discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] By referring to the following description and claims in conjunction with the accompanying drawings, and with a more comprehensive understanding of the present invention, other objects and results of the present invention will become more apparent and easier to understand. In the accompanying drawings:

[0028] Figure 1 Schematic diagram of water flow in a bulk material conveying and dust suppression method according to an embodiment of the present invention.

[0029] Figure 2Schematic diagram of the structure of a middle spray unit of a bulk material conveying and dust suppression method according to an embodiment of the present invention.

[0030] Figure 3 Schematic diagram of the structure of a terminal spray unit of a bulk material conveying and dust suppression method according to an embodiment of the present invention.

[0031] Figure 4 1 is another structural schematic diagram of a terminal spray unit of a bulk material conveying and dust suppression method according to an embodiment of the present invention.

[0032] Among them: 1. Middle spray unit; 2. Belt conveyor; 3. End spray unit; 4. Bulk material hopper. DETAILED DESCRIPTION

[0033] In the following description, for the purpose of illustration, in order to provide a comprehensive understanding of one or more embodiments, many specific details are set forth. However, it is apparent that these embodiments may also be implemented without these specific details. In other examples, for ease of describing one or more embodiments, well-known structures and devices are shown in the form of block diagrams.

[0034] It should be understood that terms such as "horizontal", "vertical", "up", "down", "top", "middle", "length", "inside", and "bottom" indicating directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present invention.

[0035] Unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, they can be fixedly connected, detachably connected, or integrated; they can be mechanically connected, electrically connected, or able to communicate with each other; they can be directly connected, or indirectly connected through an intermediate medium, and they can be internally connected between two elements or an interactive relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] Example 1

[0037] Various embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0038] Figure 1-Figure 4 The structure of the method and device for suppressing dust in bulk material transportation is generally described. Specifically, Figure 1 is a schematic diagram of water flow direction of a bulk material conveying dust suppression method according to an embodiment of the present invention; Figure 22 is a schematic structural diagram of a middle spray unit of a bulk material conveying and dust suppression method according to an embodiment of the present invention; Figure 3 2 is a schematic structural diagram of a terminal spray unit of a bulk material conveying and dust suppression method according to an embodiment of the present invention; Figure 4 1 is another structural schematic diagram of a terminal spray unit of a bulk material conveying and dust suppression method according to an embodiment of the present invention.

[0039] like Figure 1-Figure 4 As shown, the bulk material conveying dust suppression method provided by the present invention comprises: S110, conveying the bulk material to be conveyed in the silo to the belt conveyor 2; S120, when the bulk material is conveyed to the middle of the belt conveyor 2, spraying the bulk material through the middle spray unit 1, and the dust in the bulk material is wrapped by water mist and forms large dust particles and then settles on the belt conveyor 2; S130, according to the running direction of the belt conveyor 2, when the bulk material is conveyed to the end of the belt conveyor 2, the bulk material falls and is unloaded into the bulk material hopper; the end spray unit 3 sprays the bulk material being unloaded, and the dust in the bulk material is wrapped by water mist and forms large dust particles and then settles into the bulk material hopper 4; wherein, the end spray unit is arranged above the bulk material hopper 4; S140, recovering the water seeping from the belt conveyor 2 and the bulk material hopper 4 into the clean water tank through the return water collection unit.

[0040] The bulk material conveying dust suppression method of the present invention can be applied to the conveying scenarios of various bulk materials such as coal and ore. Water is conveyed to the nozzle by a dust suppression water pump, and the water is atomized to form a mist curtain near the nozzle, which is effectively combined with 1-100um dust to suppress dust particles in the production process and prevent them from spreading into the working environment. The principle of the combination of water mist and dust particles: collision aggregation. In the dust generating area, water mist and dust particles collide, and the dust is wrapped by water mist. The water mist is absorbed by the dust particles and grows into large particles. The large particles settle by gravity, and finally the purpose of dust reduction and dust suppression is achieved. In the specific implementation process, the return water collection unit also includes filtering and treating the water collected by the spray dust suppression system, and then using it for spraying again to achieve the recycling of water resources.

[0041] It also includes providing a vibrating flow aid above the discharge port of the silo; and setting the vibration frequency of the vibrating flow aid according to the type of bulk material to be transported. The vibrating flow aid directly acts on the bulk material itself through vibration, helping to break the material bridge arch, or prevent the material from piling up at the discharge port, and promoting the smooth flow of the material from the silo into the conveying equipment, such as a belt conveyor. Through automated vibration flow aid, the need for manual cleaning of the silo is reduced, and the labor intensity and safety risks are reduced. The vibrating flow aid can adjust the vibration frequency according to different material characteristics and has a wide range of applications, including a variety of powders and granular materials, such as calcium carbonate, PVC, resin, talcum powder, etc. In the specific implementation process, the vibrating flow aid can also be set to work intermittently to further reduce energy consumption.

[0042] A dust suppression device for bulk material conveying, the device comprises: a conveying module, used for conveying bulk material to be conveyed in a silo to a belt conveyor; a middle spray module, used for spraying the bulk material through a middle spray unit when the bulk material is conveyed to the middle of the belt conveyor, so that the dust in the bulk material is wrapped in water mist and forms large dust particles and then settles on the belt conveyor; a terminal spray module, used for spraying the bulk material being unloaded through terminal spraying when the bulk material is conveyed to the end of the belt conveyor and the bulk material falls and is unloaded into the bulk material hopper according to the running direction of the belt conveyor; the dust in the bulk material is wrapped in water mist and forms large dust particles and then settles into the bulk material hopper; wherein the terminal spray unit is arranged above the bulk material hopper; and a return water module, used for recycling the water seeping from the belt conveyor and the bulk material hopper into a clean water tank through a return water collection unit. That is, the integrated control of the conveying module, the middle spray module, the terminal spray module and the return water module is realized by the control unit.

[0043] The bulk material conveying dust suppression device comprises a silo, a belt conveyor 2 and a bulk material hopper 4 arranged at the end of the belt conveyor 2; it also comprises a middle spray unit 1, which is arranged in the middle of the belt conveyor and is used to spray the bulk material passing through the middle of the belt conveyor; a terminal spray unit 3, which is arranged at the end of the belt conveyor according to the running direction of the belt conveyor and is used to spray the bulk material being unloaded; wherein the terminal spray unit is arranged above the bulk material hopper; a return water collection unit, which is used to recover the water seeping from the belt conveyor and the bulk material hopper into a clean water tank; and a control unit, which is used to control the silo, the belt conveyor, the bulk material hopper, the middle spray unit, the terminal spray unit and the return water collection unit.

[0044] Further, a preferred device is that the central spray unit includes a central dust suppression water pump, a central spray water suction pipe and a nozzle assembly; the central dust suppression water pump is arranged at the output port of the clean water tank; the central spray water pipe connects the output port of the clean water tank with the output port of the clean water tank; and a nozzle assembly is arranged at the end of the central spray water suction pipe.

[0045] As an implementation of this embodiment, the terminal spray unit 3 includes a terminal dust suppression water pump, a terminal spray water suction pipe and a nozzle assembly; the terminal dust suppression water pump is arranged at the output port of the clean water tank; the terminal spray water pipe connects the output port of the clean water tank with the output port of the clean water tank; and a nozzle assembly is arranged at the end of the terminal spray water suction pipe. In other words, a dust suppression water pump can be arranged for each of the middle spray unit and the terminal spray unit, that is, the middle spray unit is provided with a middle dust suppression water pump, and the terminal spray unit is provided with a terminal dust suppression water pump, and the two systems are independent of each other.

[0046] As another implementation of this embodiment, the output port of the clean water tank is connected to the main water suction pipe; the ends of the main water suction pipe are respectively connected to the middle spray water suction pipe and the end spray water suction pipe. Dust suppression water pump 1 and dust suppression water pump 2 are arranged on the main water suction pipe, the dust suppression water pump 1 is a working water pump, and the dust suppression water pump 2 is a standby water pump. In addition, a dust suppression water pump (working state) and a dust suppression water pump in standby state can be jointly arranged for the middle and end spray units. That is, water is pumped from the clean water tank into the middle spray water suction pipe by the middle dust suppression water pump of the middle spray unit; the water output of the nozzle assembly of the middle spray unit is controlled by the pressure transmitter and the electric control valve arranged on the middle spray water suction pipe.

[0047] As an improvement, the nozzle assembly includes at least two nozzles. Specifically, the number of the nozzles is 10-50 and the nozzles are arranged in an array.

[0048] In order to further improve the degree of automation of the bulk material conveying and dust suppression method of the present invention, the liquid level sensor provided in the clean water tank is used to detect the water level in the clean water tank; when the water level in the clean water tank is lower than the set threshold, the water replenishment pump is used to replenish the water in the clean water tank to the set water level. Through the above improvements, it is ensured that the amount of water in the clean water tank is maintained at an appropriate level to meet the spray dust suppression system and other possible water needs. Prevent the spray system from not working properly due to the low amount of water in the water tank, affecting the dust suppression effect. Avoid equipment damage or system shutdown due to lack of water. In addition, the control unit of the present invention can also record information such as water level data, water replenishment times and water volume. Through data analysis, the water replenishment strategy can be optimized, maintenance needs can be predicted, and the operating efficiency of the system can be improved.

[0049] As an improvement of the present embodiment, the water level in the clean water tank is detected by a temperature sensor provided in the clean water tank; when the water temperature in the clean water tank is lower than the set temperature, the water in the clean water tank is heated to the set temperature by a heating unit. By real-time monitoring of the water temperature by the temperature sensor, the water temperature in the water tank can be timely and accurately understood, thereby achieving precise temperature control. When it is detected that the water temperature is lower than the set threshold, the heating unit automatically starts to replenish heat in time to ensure the continuous operation of the system and the stability of the water temperature. Ensure that the water temperature in the clean water tank is maintained at an appropriate level to meet specific industrial process or environmental requirements, such as preventing equipment damage or biological growth caused by too low water temperature, or maintaining an appropriate water temperature to promote certain chemical reactions or biological treatment processes. Ultimately, the technical effect of improving the energy efficiency and operating efficiency of the system and reducing energy consumption is achieved by monitoring and adjusting the water temperature.

[0050] Further, the preferred method is that a middle bulk material sensing sensor is provided at the middle of the belt conveyor; when the middle bulk material sensing sensor senses that bulk material is passing through the middle of the belt conveyor, the middle spray unit is triggered to spray the bulk material. Similar to the middle bulk material sensing sensor corresponding to the above-mentioned middle spray unit, a terminal bulk material sensing sensor is provided at the end of the belt conveyor; when the terminal bulk material sensing sensor senses that bulk material is passing through the end of the belt conveyor, the terminal spray unit is triggered to spray the bulk material. By providing bulk material sensing sensors at the middle and end of the belt conveyor, it can be ensured that spraying is triggered only when bulk material passes through, which can reduce water waste and dust suppression is only performed when needed. Real-time monitoring and automatic control of sensors can improve the accuracy of dust control, reduce dust escape, and improve the working environment. Through the automatic control system, the spray strategy can be adjusted according to the actual flow of bulk material, improving the response speed and adaptability of the system.

[0051] For the present invention, the control unit realizes the automatic spray dust removal of the bulk material conveying unit by controlling the vibration flow aid, the liquid level sensor, the heating unit, the water supply pump, the middle bulk material induction sensor, the terminal bulk material induction sensor, the pressure transmitter and the electric control valve. An automatic control system based on PLC (programmable logic controller) can be set up, which can not only receive the signal of the liquid level sensor, but also automatically control the start and stop of the water supply pump according to the signal. For the control unit, an intelligent control system based on PLC (programmable logic controller) can be adopted, which can receive the signal of the sensor and automatically control the start and stop and spray amount of the spray unit according to the signal to achieve precise spray control. Through the Internet of Things technology, the water level of the water tank can be remotely monitored, and even the operation of the water supply pump can be remotely controlled to improve the intelligence level of the system. In the specific implementation process, the control unit can be used to intelligently adjust the spray frequency and water volume according to production needs, weather forecasts (such as wind speed and wind direction) and dust concentration data to achieve more precise dust control. In other words, a more complex control logic can be achieved by combining a variety of sensors with the control unit.

[0052] In addition, according to the actual application scenario and budget of the bulk dust suppression device, the control unit can also record information such as spray events, spray volume and environmental parameters. Through data analysis, the spray strategy can be optimized, maintenance needs can be predicted, and the operating efficiency of the system can be improved. The control unit can also set fault diagnosis and alarm functions. When the sensor or spray unit fails, the system can automatically alarm and take corresponding emergency measures.

[0053] In summary, the present invention provides a method and device for suppressing dust during bulk material conveying, wherein the bulk material to be conveyed in the silo is conveyed to a belt conveyor; when the bulk material is conveyed to the middle of the belt conveyor, the bulk material is sprayed by a middle spray unit, and the dust in the bulk material is wrapped by water mist and forms large dust particles and then settles on the belt conveyor; according to the running direction of the belt conveyor, when the bulk material is conveyed to the end of the belt conveyor, the bulk material falls and is unloaded into a bulk material hopper; the end spray unit sprays the bulk material being unloaded, and the dust in the bulk material is wrapped by water mist and forms large dust particles and then settles into the bulk material hopper; wherein the end spray unit is arranged above the bulk material hopper; the water seeping from the belt conveyor and the bulk material hopper is recovered into the clean water tank through a return water collection unit. The bulk material conveying dust suppression method and device of the present invention provides a spray unit at the middle and end of the belt conveyor to spray the bulk material, and use water mist to wrap the dust to form larger particles, which then settle and deposit on the conveyor and hopper, significantly reducing the flying of dust, improving the working environment, and reducing the impact on the health of operators. The seeped water is recovered into the clean water tank through the return water collection unit, realizing the recycling of water resources, saving water resources, and reducing wastewater discharge.

[0054] However, those skilled in the art should understand that various improvements can be made to the bulk material conveying dust suppression method and device provided by the present invention without departing from the content of the present invention. Therefore, the protection scope of the present invention should be determined by the content of the attached claims.

Claims

1. A method for suppressing dust in bulk material transportation, characterized in that: Methods include, Convey the bulk materials to be transported in the silo to the belt conveyor; When the bulk material is conveyed to the middle of the belt conveyor, the bulk material is sprayed by the middle spray unit, and the dust in the bulk material is wrapped by the water mist and forms large dust particles and then settles on the belt conveyor; According to the running direction of the belt conveyor, when the bulk material is conveyed to the end of the belt conveyor, the bulk material falls and is unloaded into the bulk material hopper; the terminal spray unit sprays the bulk material being unloaded, and the dust in the bulk material is wrapped by the water mist and forms large dust particles and then settles into the bulk material hopper; wherein the terminal spray unit is arranged above the bulk material hopper; The water seeping from the belt conveyor and bulk material hopper is recovered into the clean water tank through the return water collection unit.

2. The method for suppressing dust in bulk material transportation according to claim 1, characterized in that: Also includes, A vibrating flow aid is arranged above the discharge port of the silo; The vibration frequency of the vibrating flow aid is set according to the type of bulk material to be conveyed.

3. The method for suppressing dust in bulk material transportation according to claim 1, characterized in that: Detecting the water level in the clean water tank using a liquid level sensor provided in the clean water tank; When the water level in the clean water tank is lower than a set threshold, a water replenishment pump is used to replenish the water in the clean water tank to the set water level.

4. The method for suppressing dust in bulk material transportation according to claim 3, characterized in that: Using a temperature sensor disposed in the clean water tank to detect the temperature in the clean water tank; When the water temperature in the clean water tank is lower than the set temperature, the heating unit is used to heat the water in the clean water tank to the set temperature.

5. The method for suppressing dust in bulk material transportation according to claim 1, characterized in that: The water is pumped from the clean water tank into the middle spray water suction pipe by the middle dust suppression water pump of the middle spray unit; The water output of the spray head assembly of the middle spray unit is controlled by a pressure transmitter and an electric control valve arranged on the water suction pipe to the middle spray unit.

6. The method for suppressing dust in bulk material transportation according to claim 5, characterized in that: The nozzle assembly of the middle spray unit includes more than two nozzles arranged in an array.

7. The method for suppressing dust in bulk material transportation according to claim 1, characterized in that: A middle bulk material induction sensor is arranged at the middle of the belt conveyor; When the middle bulk material sensing sensor senses that bulk material is passing through the middle of the belt conveyor, the middle spray unit is triggered to spray the bulk material.

8. The method for suppressing dust in bulk material transportation according to claim 1, characterized in that: An end bulk material sensing sensor is provided at the end of the belt conveyor; When the terminal bulk material sensing sensor senses that bulk material passes through the terminal of the belt conveyor, the terminal spray unit is triggered to spray the bulk material.

9. The method for suppressing dust in bulk material transportation according to claim 1, characterized in that: The control unit realizes automatic spray dust removal for the bulk material conveying unit by controlling the vibration flow aid, liquid level sensor, heating unit, water supply pump, middle bulk material sensing sensor, end bulk material sensing sensor, pressure transmitter and electric control valve.

10. A bulk material conveying and dust suppression device, characterized in that: include, A conveying module is used to convey the bulk materials to be conveyed in the silo to the belt conveyor; A middle spray module, used for spraying the bulk material through the middle spray unit when the bulk material is conveyed to the middle of the belt conveyor, so that the dust in the bulk material is wrapped by the water mist and forms large dust particles and then settles on the belt conveyor; The terminal spray module is used for spraying the bulk material being unloaded through the terminal spray unit when the bulk material is transported to the end of the belt conveyor and the bulk material falls and is unloaded into the bulk material hopper according to the running direction of the belt conveyor, so that the dust in the bulk material is wrapped by the water mist and forms large dust particles and then settles into the bulk material hopper; wherein the terminal spray unit is arranged above the bulk material hopper; The return water module is used to recycle the water seeping from the belt conveyor and bulk material hopper into the clean water tank through the return water collection unit.

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