Movable dust falling device for engineering construction site

By designing a mobile dust suppression device, which features convenient movement with casters, rotating atomizing nozzles, and motor-driven transmission, the problem of fixed coverage of fixed sprinkler systems and low efficiency of manual watering has been solved. This achieves comprehensive and stable dust suppression at construction sites, adapts to complex terrain and high/low work areas, and improves construction efficiency and safety.

CN120919782AInactive Publication Date: 2025-11-11黄劲
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Patent Information

Application Number
CN202511128330.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-08-13
Publication Date
2025-11-11
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

Existing fixed sprinkler dust suppression systems have a fixed coverage area, making it difficult to adapt to construction sites with large construction areas and constantly changing work points, resulting in dust accumulation in some areas; manual hand-held sprinkler equipment is labor-intensive, has low dust suppression efficiency, poor water spraying uniformity, and is greatly affected by human operation factors.

Method used

Design a mobile dust suppression device that includes a dust suppression mechanism, a moving mechanism, and a spraying mechanism. It features casters for easy movement, a rotating atomizing nozzle for spraying, a motor-driven gear transmission for all-around coverage, a retractable hose for protection, a quick liquid supply connection, and a U-shaped mounting bracket for convenient installation.

Benefits of technology

It achieves flexible and comprehensive coverage of the construction site, reduces labor costs, improves the stability and uniformity of dust suppression, adapts to complex terrain and high and low work areas, reduces dust diffusion, ensures construction safety and health, and improves construction efficiency.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention discloses a movable dust falling device for an engineering construction site, and belongs to the field of dust falling devices. Comprising a dust falling mechanism, a moving mechanism is arranged below the dust falling mechanism, and a spraying mechanism is arranged above the dust falling mechanism; the dust falling mechanism comprises a water tank, a water pump is fixedly mounted on the left side of the upper surface of the water tank, and the input end of the water pump is located in the water tank and fixedly communicates with an extraction pipe; by arranging the moving mechanism, universal wheels below the bottom plate can achieve flexible steering, an operator can easily push or pull the device to move on a construction site by means of a handle sleeved with a rubber sleeve, the operation position can be accurately adjusted according to a dust gathering area, and the problem that the coverage range of a fixed dust falling system is fixed is effectively solved; and for a scene with a relatively large construction range and continuously changing operation points, comprehensive dust falling coverage can be realized, and the phenomenon of dust accumulation is reduced.
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Description

Technical Field

[0001] This invention relates to the field of dust suppression devices, and more particularly to a mobile dust suppression device for use at engineering construction sites. Background Technology

[0002] During construction projects, such as building construction, road construction, and mining, a large amount of dust pollutants are generated. This dust not only poses a serious threat to the health of workers at the construction site—long-term inhalation can easily lead to occupational diseases such as respiratory and lung diseases—but also adversely affects the surrounding environment, causing a decline in air quality and disrupting the normal lives of nearby residents. Furthermore, persistent dust can reduce visibility at the construction site, increase safety hazards, and affect construction efficiency and progress.

[0003] To control dust pollution at construction sites, several dust suppression measures have been implemented. Common methods include fixed sprinkler systems, which typically install sprinkler heads at fixed locations on the construction site and connect to a water source via pipes for dust suppression. However, these fixed systems have significant limitations. Their coverage area is fixed, making it difficult to achieve comprehensive and effective dust suppression for construction sites with large areas and constantly changing work points. Dust can still accumulate in some areas. Another common method is manual handheld sprinkler spraying. However, this method not only consumes a lot of manpower and increases construction costs, but also has low dust suppression efficiency, poor water uniformity, and is greatly affected by human operation, making it impossible to guarantee stable dust suppression results. Furthermore, manual sprinkling has a limited range, making it difficult to effectively reach higher work areas or distant dust sources. Therefore, we propose a mobile dust suppression device for construction sites. Summary of the Invention

[0004] Purpose of the Invention: The purpose of this invention is to provide a mobile dust suppression device for construction sites, addressing the problem that existing fixed water spraying dust suppression systems have a fixed coverage area, making them difficult to adapt to construction sites with large construction areas and constantly changing work points, leading to dust accumulation in some areas. It also overcomes the shortcomings of manual handheld water spraying equipment, such as high labor costs, low dust suppression efficiency, poor water spray uniformity, and significant influence from human operation. This invention achieves flexible and comprehensive coverage of different work areas on the construction site, improving the stability and uniformity of dust suppression. Another purpose of this invention is to provide a mobile dust suppression device for construction sites, enabling it to adapt to the complex terrain and operational needs of different construction scenarios such as building construction, road construction, and mining. Through its flexible mobility, it effectively reaches higher work areas or distant dust sources, reducing dust dispersion at the construction site, lowering construction safety hazards, protecting the health of workers, improving the surrounding environmental quality, and increasing construction efficiency and progress.

[0005] Technical solution: A mobile dust suppression device for engineering construction sites, comprising a dust suppression mechanism, with a moving mechanism disposed below the dust suppression mechanism;

[0006] A spraying mechanism is installed above the dust suppression mechanism;

[0007] The dust suppression mechanism includes a water tank, a water pump is fixedly installed on the left side of the upper surface of the water tank, the input end of the water pump is located inside the water tank and is fixedly connected to an extraction pipe, the output end of the water pump is fixedly connected to a drain pipe, a cover plate is rotatably connected to the outer wall of the drain pipe via a rotating shaft, a collection cylinder is rotatably connected to the bottom of the cover plate and located outside the drain pipe via a rotating shaft, the bottom of the collection cylinder is fixedly connected to the upper surface of the water tank, a flexible hose is fixedly connected to the outer wall of the drain pipe and located inside the collection cylinder, and one end of the flexible hose away from the drain pipe extends through to the outside of the collection cylinder and is slidably connected to the collection cylinder;

[0008] A liquid filling pipe is fixedly connected to the upper front left surface of the water storage tank.

[0009] Furthermore, the moving mechanism includes a base plate, the upper surface of which is fixedly connected to the bottom of the water tank, and a plurality of casters are fixedly connected to the lower surface of the base plate.

[0010] Furthermore, two handles are fixedly connected to the left side of the upper surface of the base plate, and the outer side of the handles is fitted with rubber sleeves.

[0011] Furthermore, an installation block is fixedly connected to the upper surface of the water tank and to the right of the storage cylinder, and the front and rear surfaces of the installation block are integrally formed with baffles.

[0012] Furthermore, the spraying mechanism includes a U-shaped bracket, which is located on the outside of the mounting block, with its front and rear surfaces respectively abutting against the opposite sides of the two baffles. A screw is threadedly connected to the front right side of the U-shaped bracket, and the left end of the screw extends through to the inside of the U-shaped bracket and is rotatably connected to a clamping plate via a pivot. The left side of the clamping plate abuts against the right side of the mounting block, and a guide rod is fixedly connected to the rear right side of the clamping plate. The right end of the guide rod extends through to the right side of the U-shaped bracket and is slidably connected to the U-shaped bracket.

[0013] Furthermore, a hollow tube is rotatably connected to the right side of the upper surface of the U-shaped card holder via a rotating shaft. A transfer cylinder is fixedly connected to the top end of the hollow tube. Multiple atomizing nozzles are integrally formed on the outer side wall of the transfer cylinder. The end of the hose away from the drain pipe is fixedly connected to the outer side wall of the hollow tube. A gear one is fixedly connected to the outer side wall of the hollow tube. A motor is fixedly connected to the right side of the upper surface of the U-shaped card holder. A gear two is fixedly connected to the top end of the output shaft of the motor. The outer side wall of gear two meshes with the outer side wall of gear one.

[0014] Furthermore, the right end of the liquid filling tube is integrally formed with a snap-fit ​​sleeve, and the outer wall of the snap-fit ​​sleeve is threaded with a fastening bolt, the bottom end of which penetrates into the inner side of the snap-fit ​​sleeve.

[0015] Beneficial effects: By setting up a moving mechanism, the casters under the base plate can turn flexibly. Operators can easily push or pull the device to move it on the construction site with the help of handles covered with rubber sleeves. The working position can be precisely adjusted according to the dust accumulation area, which effectively solves the problem of fixed coverage of fixed dust suppression systems. For scenarios with large construction areas and constantly changing work points, it can achieve comprehensive dust suppression coverage and reduce dust accumulation.

[0016] In the spraying mechanism, the atomizing nozzles atomize water into fine droplets, which fully combine with dust particles to enhance dust suppression. Simultaneously, the motor, through gear transmission, drives the hollow tube, central rotating cylinder, and atomizing nozzles to rotate, achieving omnidirectional spraying and significantly expanding the dust suppression coverage area. Compared to manual water spraying for dust suppression, this method requires less manpower, reducing labor costs and avoiding the impact of human operation on dust suppression effectiveness, ensuring the stability and uniformity of the dust suppression effect and improving construction efficiency.

[0017] During the liquid addition process, the supply pipe and the liquid addition pipe can be quickly and securely connected by the snap-fit ​​sleeve and fastening bolts, making the liquid addition operation convenient and the sealing performance good. The spraying mechanism adopts a combination structure of U-shaped seat, screw and clamping plate, which is simple to install and disassemble, and easy to maintain or replace. At the same time, the spraying mechanism can be disassembled and fixed at a remote spraying point, and remote spraying can be achieved through hose connection. It can adapt to the dust suppression needs of high working areas or distant dust sources, and is suitable for various engineering construction scenarios such as building construction, road construction, mining.

[0018] In the dust suppression mechanism, the hose can extend or retract within the storage cylinder to prevent excessive length from hanging to the ground and causing wear; the cover plate rotates with the drain pipe and covers the top of the storage cylinder when the hose is retracted, preventing dust and debris from entering and contaminating the hose, effectively protecting the hose and other components, and extending the overall service life of the device. Attached Figure Description

[0019] Figure 1This is a front view structural diagram of the present invention;

[0020] Figure 2 This is a partial cross-sectional structural schematic diagram of the present invention;

[0021] Figure 3 This is a schematic diagram of the connection structure between the water pump and the storage cylinder of the present invention;

[0022] Figure 4 This is a top view of the internal structure of the storage tube of the present invention;

[0023] Figure 5 This is a schematic diagram of the connection structure between the liquid filling tube and the snap-fit ​​sleeve of the present invention;

[0024] Figure 6 This is a top view schematic diagram of the connection structure between the mounting plate and the retaining strip of the present invention;

[0025] Figure 7 This is a schematic diagram of the spraying mechanism of the present invention.

[0026] In the diagram: 1. Dust suppression mechanism; 2. Moving mechanism; 3. Spraying mechanism; 101. Water tank; 102. Water pump; 103. Extraction pipe; 104. Drain pipe; 105. Cover plate; 106. Collection cylinder; 107. Hose; 108. Liquid filling pipe; 109. Mounting block; 110. Stop bar; 111. Snap-fit ​​sleeve; 112. Fastening bolt; 201. Base plate; 202. Casters; 203. Handle; 204. Rubber sleeve; 301. U-shaped bracket; 302. Screw; 303. Clamping plate; 304. Guide rod; 305. Hollow tube; 306. Transfer cylinder; 307. Atomizing nozzle; 308. Gear 1; 309. Motor; 310. Gear 2. Detailed Implementation

[0027] To make the technical solution of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] Example

[0029] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, a mobile dust suppression device for use at engineering construction sites is provided, including a dust suppression mechanism 1;

[0030] The dust suppression mechanism 1 includes a water tank 101. A water pump 102 is fixedly installed on the left side of the upper surface of the water tank 101. The input end of the water pump 102 is located inside the water tank 101 and is fixedly connected to an extraction pipe 103. The output end of the water pump 102 is fixedly connected to a drain pipe 104. A cover plate 105 is rotatably connected to the outer wall of the drain pipe 104 via a rotating shaft. A collection cylinder 106 is rotatably connected to the bottom of the cover plate 105 and located outside the drain pipe 104 via a rotating shaft. The bottom of the collection cylinder 106 is fixedly connected to the upper surface of the water tank 101. A hose 107 is fixedly connected to the outer wall of the drain pipe 104 and located inside the collection cylinder 106. One end of the hose 107 away from the drain pipe 104 extends through to the outside of the collection cylinder 106 and is slidably connected to the collection cylinder 106.

[0031] A liquid filling pipe 108 is fixedly connected to the upper front left surface of the water storage tank 101;

[0032] The right end of the liquid filling tube 108 is integrally formed with a snap-fit ​​sleeve 111. The outer side wall of the snap-fit ​​sleeve 111 is threaded with a fastening bolt 112. The bottom end of the fastening bolt 112 extends through to the inner side of the snap-fit ​​sleeve 111.

[0033] When water needs to be added to the water tank 101, first check the connection status of the liquid supply pipe 108 and the snap-fit ​​sleeve 111. After ensuring there is no damage, align the end of the external liquid supply pipe with the inlet of the liquid supply pipe 108 and insert it, ensuring that the outer wall of the liquid supply pipe fits tightly against the inner wall of the snap-fit ​​sleeve 111 to guarantee a tight seal. Then, use a tool or manually turn the fastening bolt 112. The fastening bolt 112 will rotate within the threaded hole of the snap-fit ​​sleeve 111 and gradually move downwards until the bottom end of the fastening bolt 112 is firmly pressed against the outer wall of the liquid supply pipe, achieving a stable connection between the liquid supply pipe and the liquid supply pipe 108 and preventing water leakage during the liquid addition process. At this time, the external water source switch is turned on, and water flows smoothly into the water tank 101 through the liquid filling pipe 108 under pressure. After the water tank 101 is full of water, the water source switch is turned off, the fastening bolt 112 is turned in the opposite direction to loosen the fixation of the liquid supply pipe, and the liquid supply pipe is pulled out from the liquid filling pipe 108 to complete the liquid filling. During the dust suppression operation, the water pump 102 is started. The water pump 102 generates suction and draws the water stored in the water tank 101 through the extraction pipe 103. After the water is pressurized by the water pump 102, it is delivered to the hose 107 through the drain pipe 104. When the length of the hose 107 needs to be adjusted according to the position of the spraying mechanism 3, the drain pipe 104 can be rotated. The drain pipe 104 rotates under the action of the rotating shaft, causing the hose 107 connected to it to extend or retract within the storage cylinder 106. This ensures that the length of the hose 107 can adapt to the position requirements of the spraying mechanism 3, preventing the hose 107 from being too long and hanging to the ground, causing wear, or too short and affecting the connection. At the same time, the cover plate 105 rotates synchronously with the rotation of the drain pipe 104. When the hose 107 is retracted, the cover plate 105 can cover the top of the storage cylinder 106, preventing dust and debris from entering the storage cylinder 106 and contaminating the hose 107, thus ensuring the cleanliness and service life of the hose 107.

[0034] like Figure 1 and Figure 2 As shown, a moving mechanism 2 is provided below the dust suppression mechanism 1;

[0035] The moving mechanism 2 includes a base plate 201, the upper surface of which is fixedly connected to the bottom of the water tank 101, and a plurality of casters 202 are fixedly connected to the lower surface of the base plate 201.

[0036] Two handles 203 are fixedly connected to the left side of the upper surface of the base plate 201, and rubber sleeves 204 are fitted on the outer side of the handles 203.

[0037] When the working position of the device needs to be adjusted, the operator holds the handle 203 covered with a rubber sleeve 204 and pushes or pulls the base plate 201. The casters 202 under the base plate 201 roll accordingly, which drives the water tank 101 and the entire device to move flexibly on the construction site. The rubber sleeve 204 can increase the friction of the hand and improve the grip comfort, making it convenient for the operator to accurately adjust the position of the device according to the dust accumulation area.

[0038] like Figure 1 , Figure 2 , Figure 6 and Figure 7 As shown, a mounting block 109 is fixedly connected to the upper surface of the water tank 101 and to the right of the storage cylinder 106. The front and rear surfaces of the mounting block 109 are integrally formed with baffles 110.

[0039] A spraying mechanism 3 is installed above the dust suppression mechanism 1;

[0040] The spraying mechanism 3 includes a U-shaped bracket 301, which is located outside the mounting block 109. The front and rear surfaces of the U-shaped bracket 301 are respectively attached to the opposite parts of the two baffles 110. A screw 302 is threadedly connected to the front right side of the U-shaped bracket 301. The left end of the screw 302 extends through to the inside of the U-shaped bracket 301 and is rotatably connected to a clamping plate 303 via a rotating shaft. The left side of the clamping plate 303 is attached to the right side of the mounting block 109. A guide rod 304 is fixedly connected to the rear right side of the clamping plate 303. The right end of the guide rod 304 extends through to the right side of the U-shaped bracket 301 and is slidably connected to the U-shaped bracket 301.

[0041] A hollow tube 305 is rotatably connected to the right side of the upper surface of the U-shaped card holder 301 via a rotating shaft. The top end of the hollow tube 305 is fixedly connected to a central transfer cylinder 306. Multiple atomizing nozzles 307 are integrally formed on the outer side wall of the central transfer cylinder 306. The end of the hose 107 away from the drain pipe 104 is fixedly connected to the outer side wall of the hollow tube 305. A gear 308 is fixedly connected to the outer side wall of the hollow tube 305. A motor 309 is fixedly connected to the right side of the upper surface of the U-shaped card holder 301. A gear 310 is fixedly connected to the top end of the output shaft of the motor 309. The outer side wall of the gear 310 meshes with the outer side wall of the gear 308.

[0042] When installing the spraying mechanism 3, first clean the dust and debris from the surfaces of the mounting block 109 and the baffle 110 to ensure the mounting surfaces are clean. Then, align the U-shaped bracket 301 with the mounting block 109 and place it over the outside of the mounting block 109 from above or the side. Adjust the position of the U-shaped bracket 301 so that its front surface is in contact with the opposite surface of the front baffle 110 and its rear surface is in contact with the opposite surface of the rear baffle 110. The baffle 110 limits the U-shaped bracket 301 in the front-back direction to prevent it from wobbling after installation. Next, rotate the screw 302. The screw 302 rotates within the threaded hole of the U-shaped bracket 301 and moves to the left. Since the left end of the screw 302 is rotatably connected to the clamping plate 303 via a pivot, the screw 302 will drive the clamping plate 303 to move to the left synchronously. During the movement of the clamping plate 303, the guide rod 304 on its right rear slides within the guide hole of the U-shaped bracket 301, providing guidance for the movement of the clamping plate 303 and ensuring that the clamping plate 303 can move smoothly and accurately to the left until the left side of the clamping plate 303 is tightly attached to the right side of the mounting block 109. At this point, the screw 302 is stopped, completing the fixed installation of the spraying mechanism 3 and the mounting block 109. During dust suppression operations, the hose 107 smoothly delivers water from the drain pipe 104 into the interior of the hollow tube 305. The water flows upward within the hollow tube 305 and enters the transfer cylinder 306. The transfer cylinder 306 diverts and stabilizes the water flow, ensuring that the water is evenly distributed to each atomizing nozzle 307. The atomizing nozzles 307 atomize the water into fine droplets, which combine with dust particles in the air to achieve the dust suppression effect. Simultaneously, the motor 309 is started, and its output shaft begins to rotate, driving gear 310 to rotate synchronously. Since the outer wall of gear 310 meshes with the outer wall of gear 308, gear 310 drives gear 308 to rotate. Gear 308 is fixed to the outer wall of the hollow tube 305, which in turn drives the hollow tube 305 to rotate on the U-shaped bracket 301 via a rotating shaft. The rotation of the hollow tube 305 drives the central rotating cylinder 306 and the atomizing nozzle 307 to rotate together, enabling the atomizing nozzle 307 to perform omnidirectional rotating spraying, greatly expanding the dust suppression coverage and improving the dust suppression effect. When maintenance or replacement of the spraying mechanism 3 is required, the screw 302 is rotated in the reverse direction, causing the clamping plate 303 to move to the right, releasing the clamp on the mounting block 109, allowing the spraying mechanism 3 to be removed from the outside of the mounting block 109. In addition, in some special scenarios, such as when the dust suppression device 1 needs to be placed near a water source to collect water, and the spraying location is far from the water source, the spraying mechanism 3 can be removed from the outside of the mounting block 109, the spraying mechanism 3 can be moved to the spraying location separately, and then it can be clamped and fixed to a suitable fixed object at the spraying location by the clamping plate 303. After connecting the hose 107, remote spraying operations can be carried out.

[0043] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A mobile dust suppression device for use at construction sites, comprising a dust suppression mechanism (1), characterized in that: A moving mechanism (2) is provided below the dust collection mechanism (1); A spraying mechanism (3) is provided above the dust suppression mechanism (1); The dust suppression mechanism (1) includes a water tank (101). A water pump (102) is fixedly installed on the left side of the upper surface of the water tank (101). The input end of the water pump (102) is located inside the water tank (101) and is fixedly connected to an extraction pipe (103). The output end of the water pump (102) is fixedly connected to a drain pipe (104). A cover plate (105) is rotatably connected to the outer wall of the drain pipe (104) via a rotating shaft. The bottom of the cover plate (105) is located at the bottom of the water tank (101). A receiving tube (106) is rotatably connected to the outside of the drain pipe (104) via a rotating shaft. The bottom of the receiving tube (106) is fixedly connected to the upper surface of the water tank (101). A flexible tube (107) is fixedly connected to the outer wall of the drain pipe (104) and the inner side of the receiving tube (106). One end of the flexible tube (107) away from the drain pipe (104) extends to the outside of the receiving tube (106) and is slidably connected to the receiving tube (106). A liquid filling pipe (108) is fixedly connected to the upper front left side of the water storage tank (101).

2. The mobile dust suppression device for engineering construction sites according to claim 1, characterized in that: The moving mechanism (2) includes a base plate (201), the upper surface of which is fixedly connected to the bottom of the water tank (101), and a plurality of casters (202) are fixedly connected to the lower surface of the base plate (201).

3. A mobile dust suppression device for engineering construction sites according to claim 2, characterized in that: Two handles (203) are fixedly connected to the left side of the upper surface of the base plate (201), and the outer side wall of the handles (203) is fitted with rubber sleeves (204).

4. A mobile dust suppression device for engineering construction sites according to claim 1, characterized in that: An installation block (109) is fixedly connected to the upper surface of the water tank (101) and to the right of the storage cylinder (106). The front and rear surfaces of the installation block (109) are integrally formed with baffles (110).

5. A mobile dust suppression device for engineering construction sites according to claim 4, characterized in that: The spraying mechanism (3) includes a U-shaped bracket (301), which is located outside the mounting block (109), and its front and rear surfaces are respectively attached to the opposite positions of the two baffles (110). A screw (302) is threadedly connected to the front right side of the U-shaped bracket (301). The left end of the screw (302) extends through to the inside of the U-shaped bracket (301) and is rotatably connected to a clamping plate (303) via a rotating shaft. The left side of the clamping plate (303) is attached to the right side of the mounting block (109). A guide rod (304) is fixedly connected to the rear right side of the clamping plate (303). The right end of the guide rod (304) extends through to the right side of the U-shaped bracket (301) and is slidably connected to the U-shaped bracket (301).

6. A mobile dust suppression device for engineering construction sites according to claim 5, characterized in that: A hollow tube (305) is rotatably connected to the right side of the upper surface of the U-shaped bracket (301) via a rotating shaft. The top end of the hollow tube (305) is fixedly connected to a transfer cylinder (306). Multiple atomizing nozzles (307) are integrally formed on the outer side wall of the transfer cylinder (306). The end of the hose (107) away from the drain pipe (104) is fixedly connected to the outer side wall of the hollow tube (305). A gear one (308) is fixedly connected to the outer side wall of the hollow tube (305). A motor (309) is fixedly connected to the right side of the upper surface of the U-shaped bracket (301). A gear two (310) is fixedly connected to the top end of the output shaft of the motor (309). The outer side wall of the gear two (310) meshes with the outer side wall of the gear one (308).

7. A mobile dust suppression device for engineering construction sites according to claim 1, characterized in that: The right end of the liquid filling tube (108) is integrally formed with a snap-fit ​​sleeve (111), and the outer wall of the snap-fit ​​sleeve (111) is threaded with a fastening bolt (112), the bottom end of the fastening bolt (112) penetrating to the inner side of the snap-fit ​​sleeve (111).