Intelligent anti-freezing spray dust reduction system

CN224865138UActive Publication Date: 2026-10-20SHENHUA ZHUNGER ENERGY
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Patent Information

Application Number
CN202521967971.3
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-09-12
Publication Date
2026-10-20
Estimated Expiration
2035-09-12

AI Technical Summary

Technical Problem

[0003]本实用新型实施方式的目的在于至少提供一种智能防冻喷雾降尘系统,至少可以解决防冻效果差与抑尘效果差的问题,至少可以达到保证系统各部分防冻性能,保障在低温环境正常使用,提高抑尘效果

Benefits of technology

[0003]本实用新型实施方式的目的在于至少提供一种智能防冻喷雾降尘系统,至少可以解决防冻效果差与抑尘效果差的问题,至少可以达到保证系统各部分防冻性能,保障在低温环境正常使用,提高抑尘效果。

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses related to dust control technical field, disclose a kind of intelligent anti-freezing spray dust reduction system, including conveying pipe, water tank, dust suppressant storage tank and spray mechanism;The output end of water tank and dust suppressant storage tank is connected in one end of conveying pipe, to form dust suppressant solution by mixing after conveying water and dust suppressant respectively to conveying pipe;The other end of conveying pipe is connected with the spray mechanism;The spray mechanism is used to spray dust suppressant solution conveyed by conveying pipe;Wherein, first heating and heat preservation device for heating and heat preservation to water in water tank is provided on the water tank;Second heating and heat preservation device for heating and heat preservation to dust suppressant in dust suppressant storage tank is provided on the dust suppressant storage tank.The system provided by the utility model solves the problem of poor anti-freezing effect and poor dust suppression effect, makes the anti-freezing performance of each part of dust reduction system excellent, ensures normal use in low temperature environment, and improves dust suppression effect.
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Description

Technical Field

[0001] This utility model relates to the field of dust control technology, and in particular to an intelligent antifreeze spray dust suppression system. Background Technology

[0002] Most of my country's open-pit mines are located in the Northwest region, where winter temperatures are low and the air is dry, leading to severe dust dispersion during winter production operations. When using conventional spray dust suppression methods, water accumulates inside outdoor pipes when the spraying equipment stops operating. In low temperatures, this water easily freezes, causing pipe cracks and affecting normal equipment operation. To prevent pipe freezing, some open-pit mines currently spray a mixture of antifreeze and water for dust suppression. However, a low proportion of antifreeze results in poor antifreeze effectiveness, while a high proportion results in poor dust suppression. Utility Model Content

[0003] The purpose of this utility model is to provide at least one intelligent antifreeze spray dust suppression system, which can at least solve the problems of poor antifreeze effect and poor dust suppression effect, and at least ensure the antifreeze performance of each part of the system, ensure normal use in low temperature environment, and improve dust suppression effect.

[0004] To address the aforementioned technical problems, at least one embodiment of this application provides an intelligent antifreeze spray dust suppression system, comprising a delivery pipe, a water tank, a dust suppressant storage tank, and a spraying mechanism; the output ends of the water tank and the dust suppressant storage tank are both connected to one end of the delivery pipe to respectively deliver water and dust suppressant into the delivery pipe, which are then mixed to form a dust suppressant solution; the other end of the delivery pipe is connected to the spraying mechanism; the spraying mechanism is used to spray out the dust suppressant solution delivered by the delivery pipe; The water tank is equipped with a first heating and heat preservation device for heating and keeping the water in the tank warm; the dust suppressant storage tank is equipped with a second heating and heat preservation device for heating and keeping the dust suppressant in the storage tank warm.

[0005] The intelligent antifreeze spray dust suppression system provided in this application, compared with the prior art, uses a first heating and insulation device to heat and insulate water, and a second heating and insulation device to heat and insulate the dust suppressant. This prevents water and dust suppressant from freezing in low-temperature environments. Furthermore, during spray dust suppression, dust suppressant and water are separately delivered to the delivery pipe, where they mix to form a dust suppressant solution that is sprayed out for dust suppression. This ensures that the continuously sprayed dust suppressant solution will not freeze in the delivery pipe in low-temperature environments, guaranteeing the antifreeze performance of all parts of the system. This ensures normal dust suppression in low-temperature environments, improves the dust suppression effect, and solves the problems of poor antifreeze and poor dust suppression effects in current dust suppression applications.

[0006] Additionally, it includes an antifreeze storage tank; the output end of the antifreeze storage tank is connected to the end of the delivery pipe away from the spraying mechanism to deliver antifreeze to the delivery pipe; wherein, after the spraying mechanism has completely discharged the dust suppressant solution in the delivery pipe, antifreeze is delivered through the antifreeze storage tank to protect the delivery pipe.

[0007] In addition, the water tank and the dust suppressant storage tank are respectively equipped with a first valve and a second valve at their output ends to control the opening and closing of their output ends and the output amount of water and dust suppressant. The antifreeze storage tank is equipped with a third valve at its output end to control the opening and closing of its output end.

[0008] Additionally, it includes a controller; the first valve, the second valve, and the third valve are all connected to and controlled by the controller; the controller is also used to control the opening and closing of the spray mechanism.

[0009] In addition, a flow meter is installed on the delivery pipe to measure the flow rate inside the delivery pipe; the flow meter signal is connected to the controller to send the retrieved flow rate to the controller.

[0010] In addition, the controller includes a spray activation module and a spray deactivation module; The spray activation module is used to send activation signals to the first valve and the second valve, and to send activation signals to the spray mechanism when it receives the flow generation signal fed back by the flow meter. The spray shut-off module is used to send shut-off signals to the first valve and the second valve, and to send a shut-off signal to the spray mechanism when it receives the flow stop signal fed back by the flow meter.

[0011] In addition, the controller also includes an antifreeze module and an antifreeze cleaning module; the antifreeze module is used to send an opening signal to the third valve when the duration of receiving the flow stop signal from the flow meter reaches a preset duration, and to send a closing signal to the third valve when the antifreeze fills the delivery pipe; The antifreeze cleaning module is used to send an activation signal to the spray mechanism to discharge the antifreeze in the delivery pipe; and the antifreeze cleaning module is used to send a spray activation signal to the spray activation module when it receives a flow stop signal from the flow meter when the antifreeze is discharged.

[0012] In addition, the controller is connected to the first valve, the second valve, the third valve, and the spray mechanism via a wireless network.

[0013] In addition, the spraying mechanism includes a main spray pipe and at least one spray branch pipe connected to the main spray pipe; a spray nozzle is installed at the end of the spray branch pipe away from the main spray pipe.

[0014] In addition, the outer wall of the conveying pipe is fitted with an insulation sleeve. Attached Figure Description

[0015] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0016] Figure 1 This is a structural schematic diagram of an intelligent antifreeze spray dust suppression system provided according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the connection relationship of the controller in an intelligent antifreeze spray dust suppression system according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the working process of an intelligent antifreeze spray dust suppression system provided according to an embodiment of the present invention.

[0017] In the diagram: 1. Delivery pipe; 2. Water tank; 3. Dust suppressant storage tank; 4. Spraying mechanism; 41. Main spray pipe; 42. Branch spray pipe; 43. Spray nozzle; 5. First heating and insulation device; 6. Second heating and insulation device; 7. Antifreeze storage tank; 8. First valve; 9. Second valve; 10. Third valve; 11. Controller; 111. Spray activation module; 112. Spray deactivation module; 113. Antifreeze module; 114. Antifreeze cleaning module; 12. Flow meter. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the various embodiments of this utility model will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this utility model to enable readers to better understand this utility model. However, the technical solutions claimed by this utility model can be implemented even without these technical details and with various changes and modifications based on the following embodiments.

[0019] To facilitate understanding of the embodiments of this application, relevant content regarding spray dust suppression will be introduced first.

[0020] Most of my country's open-pit mines are located in the Northwest region, where winter temperatures are low and the air is dry, leading to severe dust dispersion during winter production operations. When using conventional dust suppression spraying methods, water accumulates inside the outdoor pipes when the spraying equipment stops working. In low ambient temperatures, this water easily freezes, causing the pipes to crack and affecting the normal operation of the equipment.

[0021] To prevent pipelines from freezing, some open-pit mines currently spray an aqueous solution of antifreeze to suppress dust. However, when the proportion of antifreeze is low, the antifreeze effect is poor, and when the proportion of antifreeze is high, the dust suppression effect is poor, making it difficult for the dust suppression system to operate normally in low-temperature environments.

[0022] Example 1: The present invention relates to an intelligent antifreeze spray dust suppression system.

[0023] Compared with the prior art, the present invention uses a first heating and heat preservation device to heat and preserve water, and a second heating and heat preservation device to heat and preserve dust suppressant. This prevents water and dust suppressant from freezing in low-temperature environments. Furthermore, during spray dust suppression, dust suppressant and water are separately delivered to the delivery pipe, where they mix to form a dust suppressant solution that is sprayed out for dust suppression. This ensures that the continuously sprayed dust suppressant solution will not freeze in the delivery pipe in low-temperature environments, guaranteeing the antifreeze performance of all parts of the system. This ensures normal dust suppression in low-temperature environments, improves the dust suppression effect, and solves the problems of poor antifreeze and poor dust suppression effects in current dust suppression applications.

[0024] The implementation details of the dust suppression system in this embodiment are described below. The following content is only for the convenience of understanding and is not necessary for implementing this solution.

[0025] The present invention provides an intelligent antifreeze spray dust suppression system, such as... Figure 1 As shown, it includes: a delivery pipe 1, a water tank 2, a dust suppressant storage tank 3, and a spraying mechanism 4; the output ends of the water tank 2 and the dust suppressant storage tank 3 are both connected to one end of the delivery pipe 1, so as to deliver water and dust suppressant to the delivery pipe 1 respectively, and then mix them to form a dust suppressant solution; the other end of the delivery pipe 1 is connected to the spraying mechanism 4; the spraying mechanism 4 is used to spray out the dust suppressant solution delivered by the delivery pipe 1. The water tank 2 is equipped with a first heating and heat preservation device 5 for heating and keeping the water in the water tank 2 warm; the dust suppressant storage tank 3 is equipped with a second heating and heat preservation device 6 for heating and keeping the dust suppressant in the dust suppressant storage tank 3 warm.

[0026] Specifically, both the first heating and insulation device 5 and the second heating and insulation device 6 include a heating element and an insulation layer. The heating element is installed on the water tank 2 and the dust suppressant storage tank 3, and the insulation layer is located on the inner wall of the water tank 2 and the inner wall of the dust suppressant storage tank 3. Specifically, the heating element can be an electric heating component, which converts electrical energy into heat energy to heat the water and dust suppressant.

[0027] Furthermore, in this embodiment, the spraying mechanism 4 includes a main spraying pipe 41 and at least one spraying branch pipe 42 connected to the main spraying pipe 41; a spray nozzle 43 is installed at the end of the spraying branch pipe 42 away from the main spraying pipe 41, that is, in this scheme, each spray nozzle 43 is connected to a spraying branch pipe 42, and the number of spray nozzles 43 corresponds to the number of spraying branch pipes 42 to ensure the dust suppression effect of each spray nozzle 43. Specifically, a delivery pipe 1 is connected to the middle of the main spraying pipe 41, so that when the delivery pipe 1 delivers the solution to the main spraying pipe 41, it is delivered from the middle of the main spraying pipe 41 to both ends, so as to balance the pressure at both ends of the main spraying pipe 41 and ensure the dust suppression effect.

[0028] In some embodiments, in order to improve the antifreeze capability of the pipeline, an insulation sleeve is provided on the outer wall of the conveying pipe 1 so that the heated and insulated water and dust suppressant can be kept warm until spraying after mixing in the conveying pipe 1, thereby avoiding the freezing of the solution during the conveying process and ensuring the dust suppression effect of spraying.

[0029] In some examples, in order to improve the accurate control of the heating temperature of water tank 2 and dust suppressant storage tank 3, temperature sensors are installed on both water tank 2 and dust suppressant storage tank 3 to detect the temperature changes of water and dust suppressant. This, combined with the heating element, enables better control of water temperature and dust suppressant temperature, facilitating the mixing of water and dust suppressant at a suitable temperature to adapt to the ambient temperature and reduce heat energy waste.

[0030] In some embodiments, the intelligent antifreeze spray dust suppression system provided in this embodiment further includes an antifreeze storage tank 7; the output end of the antifreeze storage tank 7 is connected to the end of the delivery pipe 1 away from the spray mechanism 4 to deliver antifreeze to the delivery pipe 1; wherein, after the spray mechanism 4 has completely discharged the dust suppressant solution in the delivery pipe 1, the antifreeze storage tank 7 delivers antifreeze to protect the delivery pipe 1. Through the combination of antifreeze and heating and insulation device, the dust suppression process uses a dust suppressant solution generated by mixing water and dust suppressant to spray out. When the dust suppression ends and the spraying stops, the spray mechanism 4 discharges all the dust suppressant solution in the delivery pipe 1, and then antifreeze is introduced into the delivery pipe 1. The antifreeze protects the pipeline and prevents the pipeline from freezing and cracking, thereby ensuring the antifreeze performance of each part during the spraying operation and shutdown of the entire system, and improving the service life of the dust suppression system.

[0031] Furthermore, the output ends of the water tank 2 and the dust suppressant storage tank 3 are respectively equipped with a first valve 8 and a second valve 9 to control the opening and closing of their output ends and the output volume of water and dust suppressant. The output end of the antifreeze storage tank 7 is equipped with a third valve 10 to control the opening and closing of its output end. In this embodiment, by setting the first, second and third valves 10, the delivery of water, dust suppressant and antifreeze can be directly switched by controlling each valve, which is convenient for controlling the delivery volume and delivery timing of each solution.

[0032] In some embodiments, since antifreeze, water, and dust suppressant are all delivered to the delivery pipe 1, a three-way control valve can be integrated at the output end of the delivery pipe 1 where it connects to the water tank 2, the dust suppressant storage tank 3, and the antifreeze storage tank 7. The delivery of water, dust suppressant, and antifreeze can be switched directly through the passage of the three-way control valve, making it convenient to control the delivery volume and timing of each solution.

[0033] Furthermore, such as Figure 1 and Figure 2 As shown, to improve the automation control effect, the dust suppression system provided in this embodiment also includes a controller. The first valve 8, the second valve 9, and the third valve 10 are all connected to and controlled by the controller 11. The controller 11 is also used to control the opening and closing of the spray mechanism 4. Among them, the first, second, and third valves 10 can be solenoid valves. The controller 11 can control the opening and closing of each solenoid valve by sending control signals, thereby improving the automation control effect.

[0034] Specifically, the controller 11 connects to the first valve 8, the second valve 9, the third valve 10, and the spray mechanism 4 via a wireless network. This eliminates the need for wiring when the controller 11 sends control signals to each valve and the spray mechanism 4, reducing on-site wiring layout, avoiding the impact of water mist on the wiring, facilitating the installation of dust suppression systems at open-pit mine construction sites, and improving the ease of operation and use.

[0035] In some examples, a flow meter 12 is installed on the delivery pipe 1 to measure the flow rate within the delivery pipe 1; the flow meter 12 is connected to the controller 11 to send the retrieved flow rate to the controller 11, so that the controller 11 can calculate the flow rate and determine whether there is solution in the delivery pipe 1 through the signal provided by the flow meter 12, thereby facilitating the controller 11 to automatically execute the internal dust suppression program and the antifreeze protection program after the dust suppression is completed.

[0036] Specifically, the controller 11 includes a spray activation module 111 and a spray deactivation module 112; The spray activation module 111 is used to send activation signals to the first valve 8 and the second valve 9, and to send activation signals to the spray mechanism 4 when it receives the flow generation signal fed back by the flow meter 12. The spray shut-off module 112 is used to send shut-off signals to the first valve 8 and the second valve 9, and to send a shut-off signal to the spray mechanism 4 when it receives the flow stop signal fed back by the flow meter 12.

[0037] By executing the spray start module 111 and the spray stop module 112, the delivery and output of each solution can be automatically controlled during the spray dust suppression process and at the end of the spray dust suppression.

[0038] Furthermore, to facilitate antifreeze protection, the controller 11 also includes an antifreeze module 113 and an antifreeze cleaning module 114; the antifreeze module 113 is used to send an opening signal to the third valve 10 when the duration of receiving the flow stop signal fed back by the flow meter 12 reaches a preset duration, and to send a closing signal to the third valve 10 when the antifreeze fills the delivery pipe 1. The antifreeze cleaning module 114 is used to send an opening signal to the spray mechanism 4 to discharge the antifreeze in the delivery pipe 1; and when the antifreeze cleaning module 114 receives the flow stop signal fed back by the flow meter 12 during the discharge of antifreeze, it sends a spray opening signal to the spray opening module 111.

[0039] With the cooperation of the antifreeze module 113 and the antifreeze cleaning module 114, the flow meter 12 can be used to analyze the amount of solution in the delivery pipe 1, and then automatically switch between the antifreeze protection and antifreeze cleaning spray opening states, improving the automation effect of intelligent antifreeze spray dust suppression operation without manual operation.

[0040] Specifically, through the various modules set within the controller 11, the intelligent antifreeze spray dust suppression system provided in this case, such as... Figure 1 and Figure 3As shown, the system's workflow mainly includes the following steps: Step 1, intelligent spraying is activated. The controller 11 (i.e., the main control box) transmits the activation signal to the first valve 8 and the second valve 9 via a wireless network, causing the first valve 8 and the second valve 9 to open. Water and dust suppressant are mixed in the inlet delivery pipe 1 and then flow to the flow meter 12. After the flow meter 12 detects the inflow of dust suppressant solution, it sends a feedback signal to the controller 11, prompting the controller 11 to transmit a radio signal to the spray nozzle 43, causing the spray nozzle 43 to open and start the dust suppression spraying operation; Step 2, intelligent spraying is deactivated. When the spray needs to be stopped, the spray shut-off module 112 on the controller 11 is triggered by the user, causing the controller 11 to send a shut-off signal to the first valve 8 and the second valve 9 to stop the delivery of water and dust suppressant, and maintain continuous control of the spray nozzle 43. When the dust suppressant solution in the delivery pipe 1 is finished spraying, the flow meter 12 detects that there is no solution in the delivery pipe 1 and transmits the signal to the controller 11 through the wireless network, causing the controller 11 to automatically send a shut-off signal to the spray nozzle 43 according to the received signal from the flow meter 12; Step 3, intelligent delivery of antifreeze. When the spray nozzle 43 stops working for a preset time, that is, after the flow meter 12 has continuously detected that there is no solution in the delivery pipe 1 for a preset time, the flow meter 12 transmits an electrical signal to the controller 11 via the wireless network, causing the controller 11 to activate the antifreeze module 113, which in turn sends an opening signal to the third valve 10, so that the antifreeze is delivered into the delivery pipe 1, ensuring that the antifreeze only stays in the pipe. When the antifreeze fills the delivery pipe 1, that is, when the flow meter 12 detects that the antifreeze is full of the pipe, it transmits a feedback signal to the controller 11, causing the controller 11 to send a closing signal to the third valve 10; Step 4, intelligent cleaning of antifreeze. When the sprayer is ready to be turned on after a long period of standby, the controller 11 triggers the antifreeze cleaning module 114 to send an start signal to the spraying mechanism 4 to drain the antifreeze in the delivery pipe 1. The antifreeze is discharged and detected in real time by the flow meter 12. After the flow meter 12 detects that there is no antifreeze in the pipe, it sends a signal back to the controller 11. When the controller 11 receives the flow stop signal from the flow meter 12, it automatically sends a spray start signal to the spray start module 111 and repeats the process of step one.

[0041] The intelligent antifreeze spray dust suppression system provided in this embodiment works repeatedly through the above steps, making it suitable for dust suppression operations in open-pit mines during winter. During spraying operation and shutdown, the antifreeze performance of all parts of the system is guaranteed. The workflow of each part of the system is controlled by the main control box, requiring no manual operation. This not only ensures the normal use of the spray system in extremely low temperature environments but also reflects the intelligent automatic control of the spray system.

[0042] It should be understood that the terms "mechanism," "device," "component," etc., used in this application are merely one method of distinguishing different components, elements, parts, sections, or assemblies at different levels. However, if other terms can achieve the same purpose, they can be replaced by other expressions.

[0043] Those skilled in the art will understand that the above embodiments are specific examples of implementing the present invention. In practical applications, the technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification, and various changes can be made to them in form and detail without departing from the spirit and scope of the present invention.

Claims

1. An intelligent antifreeze spray dust suppression system, characterized in that, The system includes a delivery pipe, a water tank, a dust suppressant storage tank, and a spraying mechanism. The output ends of the water tank and the dust suppressant storage tank are both connected to one end of the delivery pipe to deliver water and dust suppressant to the delivery pipe, respectively, and then mix them to form a dust suppressant solution. The other end of the delivery pipe is connected to the spraying mechanism, which sprays out the dust suppressant solution delivered by the delivery pipe. The water tank is equipped with a first heating and heat preservation device for heating and keeping the water in the tank warm; the dust suppressant storage tank is equipped with a second heating and heat preservation device for heating and keeping the dust suppressant in the storage tank warm.

2. The intelligent antifreeze spray dust suppression system according to claim 1, characterized in that, It also includes an antifreeze storage tank; the output end of the antifreeze storage tank is connected to the end of the delivery pipe away from the spraying mechanism to deliver antifreeze to the delivery pipe; wherein, after the spraying mechanism has completely discharged the dust suppressant solution in the delivery pipe, antifreeze is delivered through the antifreeze storage tank to protect the delivery pipe.

3. The intelligent antifreeze spray dust suppression system according to claim 2, characterized in that, The water tank and the dust suppressant storage tank are respectively equipped with a first valve and a second valve at their output ends to control the opening and closing of their output ends and the output amount of water and dust suppressant. The antifreeze storage tank is equipped with a third valve at its output end to control the opening and closing of its output end.

4. The intelligent antifreeze spray dust suppression system according to claim 3, characterized in that, It also includes a controller; the first valve, the second valve, and the third valve are all connected to and controlled by the controller; the controller is also used to control the opening and closing of the spray mechanism.

5. The intelligent antifreeze spray dust suppression system according to claim 4, characterized in that, The delivery pipe is equipped with a flow meter for measuring the flow rate within the delivery pipe; the flow meter signal is connected to the controller to send the retrieved flow rate to the controller.

6. The intelligent antifreeze spray dust suppression system according to claim 5, characterized in that, The controller includes a spray activation module and a spray deactivation module; The spray activation module is used to send activation signals to the first valve and the second valve, and to send activation signals to the spray mechanism when it receives the flow generation signal fed back by the flow meter. The spray shut-off module is used to send shut-off signals to the first valve and the second valve, and to send a shut-off signal to the spray mechanism when it receives the flow stop signal fed back by the flow meter.

7. The intelligent antifreeze spray dust suppression system according to claim 6, characterized in that, The controller also includes an antifreeze module and an antifreeze cleaning module; the antifreeze module is used to send an opening signal to the third valve when the duration of receiving the flow stop signal from the flow meter reaches a preset duration, and to send a closing signal to the third valve when the antifreeze fills the delivery pipe; The antifreeze cleaning module is used to send an activation signal to the spray mechanism to discharge the antifreeze in the delivery pipe; and the antifreeze cleaning module is used to send a spray activation signal to the spray activation module when it receives a flow stop signal from the flow meter when the antifreeze is discharged.

8. The intelligent antifreeze spray dust suppression system according to claim 4, characterized in that, The controller is connected to the first valve, the second valve, the third valve, and the spray mechanism via a wireless network.

9. The intelligent antifreeze spray dust suppression system according to claim 1, characterized in that, The spraying mechanism includes a main spray pipe and at least one spray branch pipe connected to the main spray pipe; a spray nozzle is installed at the end of the spray branch pipe away from the main spray pipe.

10. The intelligent antifreeze spray dust suppression system according to claim 1, characterized in that, The outer wall of the conveying pipe is fitted with an insulation sleeve.