Dustproof device for green construction site

Abstract

The invention discloses a dustproof device for a green construction site. The dustproof device comprises a base and a mounting assembly. The mounting assembly has a first mounting member and a second mounting member. The butt joint column is inserted into the middle of the inner cylinder, the retaining ring is pushed to compress the first spring, the ball head groove is kept to be communicated with the through hole, the second spring is kept to push the movable part to move upwards, and the limiting ball is pushed into the ball head groove from the containing groove. According to the dustproof device for the green construction site, a movable part is pushed downwards, the movable part is kept to compress a second spring, a containing groove is communicated with a through hole, a limiting ball enters the containing groove under the guide of an inclined conical surface, and a first spring is kept to push a retaining ring and a first mounting part to move upwards; and the first barrel body can be taken down from the second barrel body, so that the inner wall of the gun barrel, the filter screen, the motor and the fan blades can be cleaned. Not only can quick disassembly and assembly be realized, but also the operation can be completed without the help of tools. The disassembly and assembly difficulty is reduced, time is saved, and the cleaning efficiency is improved.

Description

Technical Field

[0001] The present invention relates to dust prevention technology, and particularly to a dust prevention device for a green construction site. Background Art

[0002] The fog cannon is a professional dust reduction device, which is used to manage industrial and mining dust and has a good effect on the management of construction site dust and fog burial. Therefore, it is also called a dust removal fog cannon. Before the demolition, cleaning and other operations are carried out, spray dust reduction should be carried out first. During the construction process, spraying and dust prevention, road cleaning, etc. should be carried out regularly to prevent a large amount of dust from occurring and avoid forming water accumulation on the ground. Strictly following the requirements for construction will greatly reduce the pollution of construction site dust to the atmosphere and play an important role in building a green construction site. The atomizing cannon is the main high-altitude dust control device, and the principle of the atomizing cannon is that high-pressure water is atomized and sprayed through the atomizing holes, and under the blowing of the fan, the atomized water contacts the dust in the air, increasing the weight of the dust and making it fall, so as to achieve the purpose of effective dust control.

[0003] Most of the current atomizing cannons adopt a two-stage structure, such as the atomizing cannon body disclosed in CN218306991U. The fog cannon machines currently in use have poor functionality during use. Due to the special working location, the dust-proof net, internal motor and fan blades are extremely prone to being contaminated with a large amount of dust, which affects the normal operation of the atomizing cannon. When disassembling and cleaning, a large number of bolts in the middle of the two-stage structure need to be removed, which is not convenient for operation and requires tools, time-consuming and laborious. And due to the special structure of the barrel, when a component in the barrel fails, it is not possible to simply enter it for repair. Summary of the Invention

[0004] In order to solve the defects existing in the above-mentioned prior art, the present invention proposes a dust prevention device for a green construction site.

[0005] The technical solution of the present invention is realized as follows:

[0006] A dust prevention device for a green construction site, comprising:

[0007] A base, wherein a bracket is provided inside the base, an installation frame is provided on the bracket, a rotating disk is provided on the installation frame, a fixing frame is provided on the rotating disk, a barrel is provided in the middle of the fixing frame, and the barrel is composed of a first barrel body and a second barrel body; and

[0008] An installation component for connecting the first barrel body and the second barrel body, the installation component having a first installation part installed on the first barrel body and a second installation part installed on the second barrel body,

[0009] The first installation part is composed of a first installation block and a docking column, and a plurality of ball head grooves are provided on the docking column;

[0010] The second mounting member is composed of a second mounting block and a docking seat. The docking seat is composed of an inner cylinder and an outer cylinder. A retaining ring is provided in the middle of the inner cylinder. A first spring is provided at the lower end of the retaining ring. An activity gap is formed between the outer cylinder and the inner cylinder. An activity member is provided in the activity gap. The activity member is composed of an inner ring and an outer ring. A positioning area is formed between the inner ring and the outer ring. The outer cylinder is arranged in the positioning area. A second spring is provided in the activity gap. The second spring is located at the lower end of the inner ring. Multiple through holes that cooperate with the ball head grooves are provided on the inner cylinder. Multiple receiving grooves that cooperate with the through holes are provided on the inner ring. Limit balls that cooperate with the ball head grooves and the receiving grooves are provided in the through holes.

[0011] The docking post is inserted into the middle of the inner cylinder, pushing the retaining ring to compress the first spring, keeping the ball head groove communicating with the through hole, and keeping the second spring pushing the activity member to move upward, pushing the limit ball from the receiving groove into the ball head groove.

[0012] In the present invention, the elastic force of the first spring is greater than the elastic force of the second spring.

[0013] In the present invention, the docking post is composed of a first cylinder, a second cylinder, a third cylinder, and a fourth cylinder. The ball head groove is provided on the third cylinder. The diameters of the first cylinder, the second cylinder, the third cylinder, and the fourth cylinder decrease in sequence.

[0014] In the present invention, a convex portion is provided in the middle of the inner cylinder. An annular groove is formed in the middle of the convex portion. An annular member is provided in the annular groove. A convex head that cooperates with the annular member is provided at the lower end of the fourth cylinder.

[0015] In the present invention, the retaining ring is composed of a first annular body, a second annular body, and a third annular body. The outer diameter of the first annular body cooperates with the inner wall of the inner cylinder. The outer diameter of the first annular body is smaller than the outer diameter of the second annular body. The outer diameter of the third annular body is smaller than the outer diameter of the first annular body. An inner groove is provided in the middle of the inner cylinder. The second annular body is arranged in the inner groove. The lower end of the second annular body contacts the upper end of the first spring.

[0016] In the present invention, a first contact surface is provided on the second annular body. A second contact surface that cooperates with the first contact surface is formed at the upper end of the inner groove.

[0017] In the present invention, multiple dividing grooves are provided on the inner cylinder. The dividing grooves divide the inner cylinder into multiple force-deformable retaining arms. A first guiding inclined surface is provided on the retaining arms. An extension portion is provided at the lower end of the inner ring. A guiding block that cooperates with the first guiding inclined surface is provided on the inner wall of the lower end of the extension portion. A second guiding inclined surface and a first blocking surface are provided on the guiding block.

[0018] In the present invention, guiding grooves are symmetrically arranged on the holding arm. The guiding grooves are arranged on both sides of the through hole. A deepening groove is provided at the lower end of the guiding groove. A second blocking surface that cooperates with the first blocking surface is formed between the deepening groove and the guiding groove.

[0019] In the present invention, a thickening portion is provided at the lower end of the holding arm. A bearing surface is provided on the thickening portion. When the moving member is pressed down, the extending portion is kept on the bearing surface.

[0020] In the present invention, a conical surface is provided in the through hole. The diameter of the end of the conical surface facing the outer cylinder is larger than the end facing the inner cylinder.

[0021] Implementing the dust-proof device for a green construction site of the present invention has the following beneficial effects: By pushing the moving member downward, the moving member compresses the second spring, the accommodating groove communicates with the through hole, and the limiting ball enters the accommodating groove under the guidance of the inclined conical surface. The first spring is kept pushing the retaining ring and the first mounting member upward, so that the first cylinder body can be removed from the second cylinder body, and the inner wall of the gun barrel, the filter screen, the motor and the fan blade can be cleaned. It can not only achieve quick disassembly and assembly, but also can be operated without the aid of tools. The disassembly and assembly difficulty is reduced and time is saved, and the cleaning efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of the dust-proof device for a green construction site of the present invention;

[0023] Figure 2 is Figure 1 the internal structural diagram of

[0024] Figure 3 is Figure 1 the structural diagram of the installation component in

[0025] Figure 4 is Figure 3 the top view of

[0026] Figure 5 is Figure 4 the sectional view taken along line A-A in

[0027] Figure 6 is Figure 3 the exploded view of

[0028] Figure 7 is Figure 6 the structural diagram of the first mounting member in

[0029] Figure 8 is Figure 6 the perspective view of the structure of the moving member in

[0030] Figure 9 is Figure 8 a sectional view of;

[0031] Figure 10 is Figure 6 a sectional view of the retaining ring structure in;

[0032] Figure 11 is Figure 6 a schematic diagram of the second mounting member structure in;

[0033] Figure 12 is Figure 11 a sectional view of;

[0034] Figure 13 is Figure 11 a schematic diagram of the internal structure of;

[0035] Figure 14 is Figure 13 a partial enlarged view at B in;

[0036] In the figure: base 1, mounting assembly 2, barrel 3, bracket 4, mounting frame 5, rotating disk 6, fixing frame 7, motor 8, pump 9, first cylinder 10, second cylinder 11, mounting part 12, mounting port 13, bearing seat 14, rotating shaft 15, hydraulic cylinder 16, filter screen 17, first mounting member 18, second mounting member 19, first mounting block 20, docking column 21, ball head groove 22, first cylinder body 23, second cylinder body 24, third cylinder body 25, fourth cylinder body 26, second mounting block 27, docking seat 28, inner cylinder 29, outer cylinder 30, retaining ring 31, retaining arm 32, first spring 33, moving gap 34, moving part 35, inner ring 36, outer ring 37, positioning area 38, compression area 39, second spring 40, through hole 41, tapered surface 42, limiting ball 43, receiving groove 44, protruding part 45, annular groove 46, annular part 47, protruding head 48, first annular body 49, second annular body 50, third annular body 51, inner groove 52, first contact surface 53, second contact surface 54, stroke area 55, dividing groove 56, first guiding inclined surface 57, extending part 58, guiding block 59, second guiding inclined surface 60, first blocking surface 61, guiding groove 62, deepening groove 63, second blocking surface 64, thickening part 65, bearing surface 66, first through hole 67, second through hole 68, docking hole 69. Specific embodiments

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention.

[0038] As shown in Figures 1 to 14As shown in the figure, this dust-proof device for a green construction site of the present invention includes a base 1 and an installation component 2. The installation component 2 is used for the assembly of the barrel 3, facilitating later maintenance, disassembly, and installation. No other tools are required, and one person can complete the disassembly and installation operations. This not only saves disassembly and installation time but also reduces the operation difficulty, enabling separate and rapid operation, which is beneficial to improving the disassembly and installation efficiency and ensuring the stability of the barrel 3 at the same time.

[0039] Inside the base 1, there is a support 4. On the support 4, there is a mounting frame 5. On the mounting frame 5, there is a rotating disk 6. The rotating disk 6 can enable the rotation of the fixing frame 7, thereby realizing the rotation of the barrel 3. On the rotating disk 6, there is a fixing frame 7. In the middle of the fixing frame 7, there is a barrel 3. On the support 4, there is a motor 8 and a pump 9. The motor 8 drives the pump 9 to work through a belt, and then pumps water into the barrel 3 to achieve spraying.

[0040] The barrel 3 is composed of a first barrel body 10 and a second barrel body 11. On the second barrel body 11, there is an installation part 12, and on the first barrel body 10, there is an installation opening 13 that cooperates with the installation part 12. During assembly, the installation part 12 and the installation opening 13 are just aligned. On the fixing frame 7, there is a bearing seat 14. In the middle of the bearing seat 14, there is a rotating shaft 15. One end of the rotating shaft 15 is connected to the installation part 12. And at the lower part of the fixing frame 7, there is a hydraulic cylinder 16. The upper end of the hydraulic cylinder 16 is hinged to the lower front end part of the second barrel body 11. By the telescoping of the hydraulic cylinder 16, the height of the front end of the barrel 3 can be changed to achieve angle adjustment.

[0041] Inside the barrel 3, there is a filter screen 17. On the inner walls of the first barrel body 10 and the second barrel body 11, there are arc-shaped grooves for installing the filter screen 17.

[0042] The installation component 2 is used to connect the first barrel body 10 and the second barrel body 11, enabling stable installation and facilitating disassembly at the same time. The installation component 2 has a first installation part 18 installed on the first barrel body 10 and a second installation part 19 installed on the second barrel body 11. After the first installation part 18 and the second installation part 19 are docked, the installation of the first barrel body 10 and the second barrel body 11 can be achieved.

[0043] The first installation part 18 is composed of a first installation block 20 and a docking column 21. There are multiple ball head grooves 22 on the docking column 21. The docking column 21 is composed of a first column body 23, a second column body 24, a third column body 25, and a fourth column body 26. The ball head grooves 22 are arranged on the third column body 25. The diameters of the first column body 23, the second column body 24, the third column body 25, and the fourth column body 26 decrease in sequence. The first column body 23 is connected to the first installation block 20, and the first installation block 20 is connected to the outer wall of the first barrel body 10.

[0044] The second mounting member 19 is composed of a second mounting block 27 and a docking seat 28. The docking seat 28 is composed of an inner cylinder 29 and an outer cylinder 30. The inner cylinder 29 is arranged in the middle of the outer cylinder 30. At the same time, a retaining ring 31 is provided in the middle of the inner cylinder 29. When installing the retaining ring 31, the retaining arm 32 needs to be pushed to deform it and then installed inside. A first spring 33 is provided at the lower end of the retaining ring 31, and the first spring 33 is arranged in the middle of the inner cylinder 29.

[0045] An active gap 34 is formed between the outer cylinder 30 and the inner cylinder 29. A docking hole 69 is formed in the middle of the inner cylinder 29, and the docking hole 69 cooperates with the docking column 21. An active member 35 is provided in the active gap 34. The active member 35 is composed of an inner ring 36 and an outer ring 37. A second through hole 68 is formed in the middle of the inner ring 36. A positioning area 38 is formed between the inner ring 36 and the outer ring 37, and the outer cylinder 30 is arranged in the positioning area 38. At the same time, there is a compression area 39 between the upper end of the outer cylinder 30 and the upper end surface of the positioning area 38. The compression area 39 is used for the active member 35 to move downward and compress the second spring 40.

[0046] A second spring 40 is provided in the active gap 34. The second spring 40 is located at the lower end of the inner ring 36. The inner cylinder 29 is provided with a plurality of through holes 41 that cooperate with the ball head grooves 22. A tapered surface 42 is provided in the through holes 41. The diameter of the end of the tapered surface 42 facing the outer cylinder 30 is larger than the end facing the inner cylinder 29, so that the limit ball 43 can move into the receiving groove 44 by its own gravity. A plurality of receiving grooves 44 that cooperate with the through holes 41 are provided on the inner ring 36. Limit balls 43 that cooperate with the ball head grooves 22 and the receiving grooves 44 are provided in the through holes 41.

[0047] As Figure 5 shown, the state at this time is that the first mounting member 18 and the second mounting member 19 remain in the inserted state. At this time, the limit balls 43 are in the ball head grooves 22 and the through holes 41, and the receiving grooves 44 are at the upper end of the through holes 41 at this time. When the active member 35 is pushed downward, the second spring 40 will be compressed, and the receiving grooves 44 will move downward accordingly, keeping the through holes 41 corresponding to the receiving grooves 44. And because the inclined tapered surface 42 is provided in the through holes 41, the limit balls 43 will enter the receiving grooves 44 under the action of gravity, so that the limit balls 43 are removed from the ball head grooves 22. At this time, since the first spring 33 is no longer restricted by the limit balls 43, it can push the retaining ring 31 upward, driving the first mounting member 18 to also move upward a certain distance, so that the upper end of the retaining ring 31 is in the middle position of the through hole 41, which can prevent the limit balls 43 from being removed from the receiving grooves 44 under the push of the second spring 40.

[0048] The elastic force of the first spring 33 is greater than that of the second spring 40, which facilitates keeping the first spring 33 pushing the retaining ring 31 and the first mounting member 18 upward when the movable member 35 is pushed, so as to facilitate pressing the movable member 35, and then the limit ball 43 can be moved out of the ball head groove 22 to release the restriction on the first mounting member 18.

[0049] A convex portion 45 is provided in the middle of the inner cylinder 29. An annular groove 46 is formed in the middle of the convex portion 45. An annular member 47 is provided in the annular groove 46. A convex head 48 that cooperates with the annular member 47 is provided at the lower end of the fourth cylinder 26. The annular member 47 is a rubber ring, which can prevent the first mounting member 18 from colliding with the second mounting member 19 during installation. After the first mounting member 18 is inserted, the annular member 47 can be extruded to deform under force.

[0050] A first through hole 67 is formed in the middle of the retaining ring 31. The retaining ring 31 is composed of a first annular body 49, a second annular body 50 and a third annular body 51. The outer diameter of the first annular body 49 is matched with the inner wall of the inner cylinder 29. The outer diameter of the first annular body 49 is smaller than that of the second annular body 50. The outer diameter of the third annular body 51 is smaller than that of the first annular body 49. An inner groove 52 is provided in the middle of the inner cylinder 29. The second annular body 50 is arranged in the inner groove 52. The lower end of the second annular body 50 is in contact with the upper end of the first spring 33. The outer diameter of the second annular body 50 is matched with the inner wall of the inner groove 52.

[0051] Since the outer diameter of the second annular body 50 is larger than the inner diameter of the inner cylinder 29, during installation, it is necessary to push the retaining arm 32 to open through the retaining ring 31 and deform under force to keep the second annular body 50 entering the inner groove 52.

[0052] A first contact surface 53 is provided on the second annular body 50. A second contact surface 54 that cooperates with the first contact surface 53 is formed at the upper end of the inner groove 52. As Figure 5 shown, at this time, the first mounting member 18 is inserted into the second mounting member 19, the first contact surface 53 and the second contact surface 54 are separated, and a stroke area 55 is formed therebetween. When the first contact surface 53 and the second contact surface 54 are in contact, the first spring 33 has already pushed the retaining ring 31 upward, and the first mounting member 18 is in the state of being taken out from the middle of the second mounting member 19.

[0053] Multiple dividing grooves 56 are provided on the inner cylinder 29. The dividing grooves 56 divide the inner cylinder 29 into multiple retaining arms 32 that can deform under force. The retaining arms 32 can deform under force, which is convenient for the installation of the retaining ring 31 and the movable member 35.

[0054] The holding arm 32 is provided with a first guiding inclined surface 57, the lower end of the inner ring 36 is provided with an extension portion 58, the inner wall of the lower end of the extension portion 58 is provided with a guiding block 59 that cooperates with the first guiding inclined surface 57, and the guiding block 59 is provided with a second guiding inclined surface 60 and a first blocking surface 61.

[0055] The holding arm 32 is provided with symmetrically arranged guiding grooves 62, the guiding grooves 62 are arranged on both sides of the through hole 41, the lower end of the guiding groove 62 is provided with a deepening groove 63, the depth of the deepening groove 63 is greater than the depth of the guiding groove 62, and a second blocking surface 64 that cooperates with the first blocking surface 61 is formed between the deepening groove 63 and the guiding groove 62.

[0056] When the first blocking surface 61 contacts the second blocking surface 64, the movable member 35 is pushed upward by the second spring 40 at this time, and the second spring 40 is also in a slightly compressed state, so that the movable member 35 is pushed upward by the force. When the first blocking surface 61 and the second blocking surface 64 are separated, the second spring 40 is in a compressed state at this time.

[0057] A thickening portion 65 is provided at the lower end of the holding arm 32, a bearing surface 66 is provided on the thickening portion 65, and the extension portion 58 is placed on the bearing surface 66 when the movable member 35 is pressed downward. The bearing surface 66 is used to limit the stroke distance of the downward movement of the movable member 35.

[0058] When the first mounting member 18 and the second mounting member 19 need to be butt-jointed and installed, first insert the docking post 21 into the middle of the inner cylinder 29, and push the holding ring 31 by the third cylinder 25 to compress the first spring 33, so that the first contact surface 53 and the second contact surface 54 are separated. And the holding ball head groove 22 is communicated with the through hole 41, the limiting ball 43 no longer limits the position of the movable member 35, and the second spring 40 is kept pushing the movable member 35 upward to push the limiting ball 43 from the accommodating groove 44 into the ball head groove 22, thereby limiting the position of the first mounting member 18.

[0059] When the first cylinder body 10 needs to be disassembled, the staff only needs to first push each movable member 35 downward, so that the second spring 40 is compressed, keep the accommodating groove 44 communicated with the through hole 41, and the limiting ball 43 enters the accommodating groove 44 under its own gravity along the inclined conical surface 42. Then the first spring 33 can push the holding ring 31 and the first mounting member 18 upward by a certain distance, so that the upper end surface of the holding ring 31 is in the middle position of the through hole 41, which can block the position of the limiting ball 43. After the first mounting member 18 is taken out, the first spring 33 continues to push the holding ring 31 upward, so that the first contact surface 53 and the second contact surface 54 are in contact.

[0060] After all the movable parts 35 are pushed downward, the entire first cylinder body 10 can be removed from the second cylinder body 11, and the internal filter net 17, motor, and fan blades can be cleaned. No other tool operation is required, and a single staff member can disassemble and assemble, improving the maintenance efficiency.

[0061] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A dust prevention device for green construction sites, characterized in that: include: A base, wherein a bracket is provided inside the base, a mounting frame is provided on the bracket, a rotating disk is provided on the mounting frame, a fixing frame is provided on the rotating disk, a barrel is provided in the middle of the fixing frame, and the barrel consists of a first barrel body and a second barrel body; and A mounting assembly for connecting a first cylinder to a second cylinder, the mounting assembly comprising a first mounting member mounted on the first cylinder and a second mounting member mounted on the second cylinder, The first mounting member is composed of a first mounting block and a docking column, and a plurality of ball head grooves are arranged on the docking column; the second mounting member is composed of a second mounting block and a docking seat, and the docking seat is composed of an inner cylinder and an outer cylinder, a retaining ring is arranged in the middle of the inner cylinder, and a first spring is arranged at the lower end of the retaining ring, and an active gap is formed between the outer cylinder and the inner cylinder, and a movable member is arranged in the active gap, and the movable member is composed of an inner ring and an outer ring, and a positioning area is formed between the inner ring and the outer ring, and the outer cylinder is arranged in the positioning area, and a second spring is arranged in the active gap, and the second spring is located at the lower end of the inner ring, and a plurality of through holes matching with the ball head grooves are arranged on the inner cylinder, and a plurality of accommodating grooves matching with the through holes are arranged on the inner ring, and a limiting ball matching with the ball head groove and the accommodating groove is arranged in the through hole, The docking column is inserted into the middle of the inner cylinder, pushing the retaining ring to compress the first spring, keeping the ball head groove connected to the through hole, keeping the second spring to push the movable part to move upward, and pushing the limiting ball from the accommodating groove into the ball head groove.

2. The dust prevention device for green construction sites according to claim 1 is characterized in that: The elastic force of the first spring is greater than the elastic force of the second spring.

3. The dust prevention device for green construction sites according to claim 1 is characterized in that: The docking column is composed of a first column, a second column, a third column and a fourth column, the ball head groove is arranged on the third column, and the diameters of the first column, the second column, the third column and the fourth column are successively reduced.

4. The dust prevention device for green construction sites according to claim 3 is characterized in that: A raised portion is arranged in the middle of the inner cylinder, an annular groove is formed in the middle of the raised portion, an annular member is arranged in the annular groove, and a raised head cooperating with the annular member is arranged at the lower end of the fourth column.

5. The dust prevention device for green construction sites according to claim 1, characterized in that: The retaining ring is composed of a first annular body, a second annular body and a third annular body. The outer diameter of the first annular body matches the inner wall of the inner cylinder. The outer diameter of the first annular body is smaller than the outer diameter of the second annular body. The outer diameter of the third annular body is smaller than the outer diameter of the first annular body. An inner groove is provided in the middle of the inner cylinder. The second annular body is arranged in the inner groove. The lower end of the second annular body contacts the upper end of the first spring.

6. The dust prevention device for green construction sites according to claim 5, characterized in that: The second annular body is provided with a first contact surface, and the upper end of the inner groove forms a second contact surface matching the first contact surface.

7. The dust prevention device for green construction sites according to claim 1, characterized in that: The inner cylinder is provided with a plurality of dividing grooves, and the dividing grooves divide the inner cylinder into a plurality of force-bearing and deformable retaining arms, and the retaining arms are provided with a first guiding inclined surface, and the lower end of the inner ring is provided with an extension portion, and the lower end inner wall of the extension portion is provided with a guiding block that cooperates with the first guiding inclined surface, and the guiding block is provided with a second guiding inclined surface and a first blocking surface.

8. The dust prevention device for green construction sites according to claim 6, characterized in that: The retaining arm is provided with symmetrically arranged guide grooves, the guide grooves are arranged on both sides of the through hole, the lower end of the guide groove is provided with a deepened groove, and a second blocking surface that matches the first blocking surface is formed between the deepened groove and the guide groove.

9. The dust prevention device for green construction sites according to claim 6, characterized in that: A thickened portion is provided at the lower end of the retaining arm, and a bearing surface is provided on the thickened portion. When the movable member is pressed downward, the extending portion is kept placed on the bearing surface.

10. The dust prevention device for green construction sites according to claim 1, characterized in that: A conical surface is provided in the through hole, and the diameter of one end of the conical surface facing the outer cylinder is larger than that of the other end facing the inner cylinder.

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