A construction site spray dust suppression apparatus

Abstract

The application relates to a construction site spray dust-settling device, belonging to the technical field of spray dust-settling, which comprises a base, a water controller, high-pressure spray heads, and a driver, the water controller is rotatably installed on the base, the input end of the water controller is used for externally connecting a water supply pipeline, the output end of the water controller is connected with the high-pressure spray heads, and the driver is configured to drive the water controller and the high-pressure spray heads to rotate on the base; the water controller is internally provided with a first flow channel and a second flow channel, and a flow channel switch is arranged, the flow channel switch is configured to control the first flow channel and / or the second flow channel to be opened; a plurality of side spray heads are installed on the outer side of the water controller, when the first flow channel is opened, the water flow is configured to flow to the high-pressure spray heads to perform high-pressure large-range spray dust-settling work, and when the second flow channel is opened, the water flow is configured to flow to the side spray heads to perform small-range intensive spray dust-settling work; and the two can work cooperatively to perform all-around spray dust-settling work when dust-settling demand is large.

Description

Technical Field

[0001] This invention relates to the field of dust suppression spraying technology, specifically to a dust suppression spraying device for construction sites. Background Technology

[0002] During the construction process, particulate matter pollution caused by construction dust has become an important factor affecting urban air quality. Construction sites are widely distributed within cities, and their dust emissions are characterized by numerous points, wide areas, and recurring occurrences, making it one of the stubborn problems in air pollution control. Existing dust suppression spraying devices mainly include enclosure-type mist spraying dust suppression devices and fog cannon trucks. Enclosure-type mist spraying dust suppression devices use fixed atomizing nozzles installed on enclosures, resulting in a small effective atomization range. Fog cannon trucks have requirements for the work site, are inconvenient to move, and may be restricted by vehicle access and terrain conditions. Some devices use rotating fog pile dust suppression systems, which work by using a plunger pump to pressurize water to a certain value, then transporting the pressurized water to a rotating head on the fog pile pole for atomization and spraying. This forms a large number of floating water mist particles over a wide area, effectively adsorbing dust and suppressing dust. Although this increases the spraying range, the high-pressure spraying prevents effective dust suppression around the fog pile pole. Furthermore, after prolonged operation, the nozzles are prone to clogging, requiring manual cleaning and disassembly, which is time-consuming and labor-intensive. Therefore, there is an urgent need for a new type of construction site dust suppression spraying equipment to solve the above problems. Summary of the Invention

[0003] The purpose of this invention is to provide a dust suppression spraying device for construction sites to solve the problems mentioned in the background art.

[0004] To solve the above technical problems, the present invention adopts the following technical solution: a construction site spray dust suppression device, including a base, a water controller and a high-pressure nozzle, and a driver, wherein the water controller is rotatably mounted on the base, and the input end of the water controller is used to connect to an external water supply pipeline, the output end of the water controller is connected to the high-pressure nozzle, and the driver is configured to drive the water controller and the high-pressure nozzle to rotate 360° on the base; The water controller is provided with a first flow channel and a second flow channel, as well as a flow channel switch. The flow channel switch is configured to control the opening of the first flow channel and / or the second flow channel. Several side nozzles are installed on the outside of the water controller. When the first flow channel is open, it is configured to control the water flow to the high-pressure nozzle. When the second flow channel is open, it is configured to control the water flow to the side nozzle.

[0005] Preferably, the input end of the water controller is equipped with an input pipe for connecting to an external water supply pipeline, and a driven gear is coaxially mounted on the input pipe. The driver includes a drive motor and a drive gear mounted on the output shaft of the drive motor, and the drive gear meshes with the driven gear.

[0006] Preferably, the water controller's inner cavity includes an upper cavity and a lower cavity, which are directly separated by a partition. The first flow channel and the second flow channel are located in the upper cavity. The partition has a first through hole and a second through hole. The first through hole communicates with the first flow channel, and the second through hole communicates with the second flow channel. The flow channel switch includes an integrated piston with a first piston head and a second piston head. As the integrated piston moves, it is configured such that only the first piston head blocks the first through hole, or only the second piston head blocks the second through hole.

[0007] Preferably, the ends of the first and second flow channels near the corresponding first and second through holes are defined as inlets, and the ends near the output end of the water controller are defined as outlets. A filter screen is installed in the first flow channel, and the integrated piston also has a third piston head. The side nozzle communicates with the second flow channel; and the third piston head is configured as follows: When the first piston head blocks the first through hole, the third piston head opens the output port of the second flow channel and simultaneously blocks the output end of the water controller; the water flows through the second flow channel inlet, the second flow channel, the second flow channel outlet, the first flow channel outlet, the filter screen, and the first flow channel in sequence before entering the side spray head; When the second piston head blocks the second through hole, the third piston head blocks the output port of the second flow channel and simultaneously opens the output end of the water controller; the water flow passes through the first flow channel inlet, the first flow channel, and the first flow channel outlet in sequence, and enters the high-pressure nozzle from the output end of the water controller. When the water flow passes through the first flow channel, it is controlled to enter the side nozzle as needed.

[0008] Preferably, a piston spring is installed between the first through hole and the first piston head and / or between the second through hole and the second piston head, the piston spring being configured to tend to drive the first piston head away from the first through hole and the second piston head to block the second through hole.

[0009] Preferably, an electric valve is installed at the input end of the side-channel nozzle.

[0010] Preferably, the side-flow nozzle includes a nozzle housing and a movable inner core. The movable inner core is slidably installed inside the nozzle housing along the water delivery direction of the nozzle, and a return spring is installed between the movable inner core and the nozzle housing. The output end of the nozzle housing is a constricted nozzle shape, and the output end of the movable inner core is mainly formed by multiple movable blocks. The movable inner core is configured as follows: When the nozzle moves toward the output end of the nozzle housing under pressure, the return spring is compressed, and at the same time, the multi-lobed movable block is restricted by the shape of the constriction port and retracts toward the center, and the inner diameter of the output end of the movable inner core becomes smaller. When not under pressure, the movable inner core returns to its original position under the action of the return spring, and at the same time, the multi-lobed movable block is released from the shape restriction of the contraction opening, and the inner diameter of the output end of the movable inner core increases.

[0011] Preferably, the side spray nozzles are installed at locations corresponding to the partition, and the partition is provided with slots for guiding the water flow on the partition towards each side spray nozzle.

[0012] Preferably, the nozzle housing includes a first housing and a second housing, which are movably connected. The movable inner core is located inside the first housing. The first housing is configured to swing around the second housing when the movable inner core is pressed toward the output end of the nozzle housing, causing the output end of the second housing to move away from the water controller.

[0013] Preferably, an air bladder is provided between the first outer shell and the second outer shell, and at least part of the movable inner core moving area inside the first outer shell forms a piston cylinder. The outer wall of the movable inner core extends outward and fits against the inner wall of the first outer shell to form a piston head. The air bladder is connected to the piston cylinder. When the movable inner core is pressed and moves toward the output end of the nozzle outer shell, it squeezes the gas in the piston cylinder into the air bladder. The expansion of the air bladder causes the first outer shell to swing around the second outer shell, so that the output end of the second outer shell tends to move away from the water controller.

[0014] Beneficial effects: This invention uses a water controller to control the water flow to the high-pressure nozzles for high-pressure, wide-area dust suppression, and to the side nozzles for small-area, intensive dust suppression. Both can work together to provide comprehensive dust suppression when demand is high, solving the problem of blind spots in existing rotating mist pile dust suppression systems with their single-mode spraying. Furthermore, by utilizing a designed flow channel switch in conjunction with the first and second flow channels, and the dynamically adaptive and self-adjusting side nozzles, the invention allows for easy switching between different spray modes. It also allows for flexible switching between backwashing and small-area dust suppression in conjunction with water pressure control. This further filters the water entering the high-pressure nozzles, extending their operating time, and enables automatic backwashing and wastewater discharge without causing blockages in the side nozzles. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the construction site spray dust suppression equipment in this invention; Figure 2 This is a cross-sectional view of the base and water controller in this invention; Figure 3 This is a schematic diagram of the internal structure of the water controller in this invention; Figure 4 This is a schematic diagram of the first and second flow channels of the water controller in this invention; Figure 5 This is a schematic diagram of the integrated piston in this invention; Figure 6 This is a schematic diagram of the internal structure of the side-path nozzle in this invention; Figure 7 This is a cross-sectional view of the side-path nozzle in this invention.

[0016] The diagram is labeled as follows: 1. Base; 2. Water controller; 21. First flow channel; 22. Second flow channel; 23. Upper cavity; 24. Lower cavity; 25. Partition; 26. First through hole; 27. Second through hole; 28. Filter screen; 29. ​​Output end of water controller; 3. High-pressure nozzle; 4. Drive motor; 41. Drive gear; 5. Input pipe; 51. Driven gear; 6. Integrated piston; 61. First piston head; 62. Second piston head; 63. Third piston head; 7. Side nozzle; 71. Electric valve; 72. Nozzle housing; 73. Movable inner core; 74. Return spring; 75. Shrinkage outlet shape; 76. Movable block; 77. First outer shell; 78. Second outer shell; 8. Telescopic cylinder; 81. Connecting rod; 9. Piston spring; 10. Airbag; 11. Piston cylinder; 12. Piston head; 13. Groove; 14. Connecting channel. Detailed Implementation

[0017] To make the objectives and advantages of this invention clearer, the invention will be specifically described below with reference to embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of the invention and does not strictly limit the scope of protection specifically claimed by the invention.

[0018] Example: A dust suppression spraying system for construction sites includes a base 1, a water controller 2, a high-pressure nozzle 3, and a driver. (See reference) Figures 1-2 As shown, taking vertical installation as an example, the base 1 has a mounting hole. The water controller 2 is installed in the corresponding mounting hole through a bearing structure, so that the water controller 2 is rotatably installed on the base 1. The input end of the water controller 2 extends downward out of the mounting hole for connecting to an external water supply pipeline. The output end of the top of the water controller 2 is used to connect to the high-pressure nozzle 3. The driver is installed on the base 1 to drive the water controller 2 and the high-pressure nozzle 3 to rotate 360° on the base 1. The water flow is delivered to the water controller 2 through the external water supply pipeline. After being controlled by the water controller 2, it is delivered to the high-pressure nozzle 3 and sprayed out. During the spraying process, it can be driven to rotate by the driver, thereby realizing rotary spraying.

[0019] In this embodiment, reference Figure 1As shown, the driver is a drive motor 4 structure. The input end of the water controller 2 is equipped with an input pipe 5, which is used to connect to an external water supply pipeline. A driven gear 51 is coaxially mounted on the input pipe 5. The output shaft of the drive motor 4 is equipped with a drive gear 41. The drive gear 41 meshes with the driven gear 51. Driven by the drive motor 4, the water controller 2 and the high-pressure nozzle 3 are rotated on the base 1 through the cooperation of the drive gear 41 and the driven gear 51.

[0020] In this embodiment, the water controller 2 is provided with a first flow channel 21 and a second flow channel 22, as well as a flow channel switch. The flow channel switch is configured to control the opening of the first flow channel 21 and / or the second flow channel 22. Several side nozzles 7 are installed on the outside of the water controller 2. When the first flow channel 21 is open, it is configured to control the water flow to the high-pressure nozzle 3. When the second flow channel 22 is open, it is configured to control the water flow to the side nozzles 7. Through the flow channel switch, the water flow can be controlled to spray from the high-pressure nozzle 3 or the side nozzles 7 as needed. The high-pressure nozzle 3 can achieve a spray dust suppression surface that is far away from the controller and has a large radius. The side nozzles 7 can achieve a spray dust suppression surface that is close to the water controller 2 and is relatively dense, thereby realizing the execution of different spray dust suppression tasks as needed.

[0021] In one embodiment, a flow channel switch is provided, which can control the direction of water flow through simple motion control. See details below. Figures 3-5 As shown, the inner cavity of the water controller 2 includes an upper cavity 23 and a lower cavity 24, which are directly separated by a partition 25. The first flow channel 21 and the second flow channel 22 are located within the upper cavity 23. In this embodiment, the first flow channel 21 and the second flow channel 22 are configured as two coaxially arranged channels. The second flow channel 22 is an inner channel with a smaller inner diameter, and the first flow channel 21 is an outer channel with a larger inner diameter. (Refer to...) Figures 3-4 The partition 25 has a first through hole 26 and a second through hole 27. The first through hole 26 communicates with the first flow channel 21, and the second through hole 27 communicates with the second flow channel 22. (See reference) Figure 5 As shown, the flow channel switch includes an integrated piston 6, which has a first piston head 61 and a second piston head 62. The first piston head 61 is located below the partition 25, and the second piston head 62 is located above the partition 25. Figure 3 For example, when the integrated piston 6 moves upward, the first piston head 61 approaches and inserts into the first through hole 26, and the second piston head 62 disengages from the second through hole 27, thereby blocking the first through hole 26 and opening the second through hole 27. When the integrated piston 6 moves downward, the second piston head 62 approaches and inserts into the second through hole 27, and the first piston head 61 disengages from the first through hole 26, thereby blocking the second through hole 27 and opening the first through hole 26.

[0022] In one embodiment, a filter screen 28 is installed in the first flow channel 21 to further filter impurities in the water, extend the service life of the high-pressure nozzle 3, and prevent clogging. In this embodiment, in conjunction with the first flow channel 21, the second flow channel 22, and the third piston head 63 of the integrated piston 6, a backwashing operation can be achieved, thereby automatically cleaning the filter screen 28 without manual disassembly. Specifically, the ends of the first flow channel 21 and the second flow channel 22 near the corresponding first through hole 26 and second through hole 27 are defined as inlet ports, and the ends near the output end 2 of the water controller are defined as outlet ports. Figure 3 For example, the controller housing has multiple mounting holes, the side nozzle 7 is assembled into the mounting holes and communicates with the second flow channel 22; and the third piston head 63 is configured as follows: refer to Figure 3 As shown, the water flow direction is given. When the first piston head 61 blocks the first through hole 26, the third piston head 63 opens the output port of the second flow channel 22 and simultaneously blocks the output end 2 of the water controller. The water flows through the second through hole 27, and then sequentially passes through the input port of the second flow channel 22, the second flow channel 22, the output port of the second flow channel 22, the output port of the first flow channel 21, the filter screen 28, and the first flow channel 21 before entering the side nozzle 7. When the second piston head 62 blocks the second through hole 27, the third piston head 63 blocks the output port of the second flow channel 22 and simultaneously opens the output end 2 of the water controller; the water flows through the first through hole 26, and sequentially through the input port of the first flow channel 21, the first flow channel 21, and the output port of the first flow channel 21, and enters the high-pressure nozzle 3 from the output end 2 of the water controller. Among them, when the water flows through the first flow channel 21, it is controlled to enter the side nozzle 7 as needed.

[0023] In one embodiment, the movement control of the integrated piston 6 is to enable the integrated piston 6 to move in a specified direction, without being limited by the control method. In this embodiment, the control of the telescopic cylinder 8 is taken as an example. The telescopic cylinder 8 is installed on the high-pressure nozzle 3. The high-pressure nozzle 3 has a reserved channel for the installation of the telescopic end of the telescopic cylinder 8. The channel and the telescopic end of the telescopic cylinder 8 form a dynamic seal. The telescopic end is inserted from the output end 2 of the water controller into the second flow channel 22 through the connecting rod 81 and is connected to the top of the third piston head 63. The movement of the integrated piston 6 can be operated by controlling the telescopic cylinder 8.

[0024] Among them, reference Figure 3As shown, a piston spring 9 is installed between the first through hole 26 and the first piston head 61 and / or between the second through hole 27 and the second piston head 62. The piston spring 9 is configured to tend to drive the first piston head 61 away from the first through hole 26 and the second piston head 62 to block the second through hole 27. The piston spring 9 enables the first piston head 61 to be kept away from the first through hole 26 and the second piston head 62 to block the second through hole 27 during normal operation, so that water can enter the first flow channel 21 normally for use by the high-pressure nozzle 3, and prevent water from entering the second flow channel 22.

[0025] In one embodiment, an electric valve 71 is installed at the input end of the side-path sprinkler head 7. Based on the cooperation of the electric valve 71, this embodiment provides a method for dust suppression by spraying at a construction site, specifically including three working modes: In mode 1, the high-pressure nozzle 3 is working, the second piston head 62 blocks the second through hole 27, the water flows through the first flow channel 21, and passes through the bottom of the filter plate into the high-pressure nozzle 3 to perform high-altitude, large-area spraying to reduce dust. In mode two, after the high-pressure nozzle 3 has been working for a certain period of time, the first piston head 61 is controlled to block the first through hole 26 and open the second through hole 27. The water flows through the second flow channel 22 and passes through the top of the filter plate into the first flow channel 21 to achieve the reverse flushing operation of the filter plate. At the same time, the electric valve 71 controls the side nozzle 7 to open, which drives the impurities to be sprayed out through the side nozzle 7 to achieve automatic backwashing. In mode three, only the side nozzle 7 works. After the automatic backwashing in mode two is completed, the water pressure is increased to maintain the mode two state. Then, the side nozzle 7 can be used to perform small-scale and dense spraying to reduce dust. Mode 4 maintains the state of Mode 1, while the electric valve 71 controls the side nozzle 7 to open, increasing the water pressure. This allows the high-pressure nozzle 3 and the side nozzle 7 to work simultaneously, so as to carry out comprehensive dust suppression without dead angles when the dust suppression intensity is high and the dust distribution is wide.

[0026] In one embodiment, based on the working methods of Mode 2 and Mode 3, referencing Figures 6-7 As shown, in this embodiment, the side-flow nozzle 7 includes a nozzle housing 72 and a movable inner core 73. The movable inner core 73 is slidably installed inside the nozzle housing 72 along the water delivery direction of the nozzle, and a return spring 74 is installed between the movable inner core 73 and the nozzle housing 72. The output end of the nozzle housing 72 is a constriction nozzle shape 75, and the output end of the movable inner core 73 is mainly formed by multiple movable blocks 76. The movable blocks 76 are movably connected to the movable inner core 73 and can converge towards the center when pressed. The movable inner core 73 is configured as follows: When operating in mode two, the water pressure is relatively low. Under the action of the return spring 74, the movable inner core 73 is in its initial position. At the same time, the multi-lobed movable block 76 is freed from the restriction of the constriction port shape 75. The inner diameter of the output end of the movable inner core 73 is large. At this time, the water flow after backwashing carries impurities into the movable inner core 73 and flows out through its larger output end, avoiding impurities from clogging the movable inner core 73. When operating in mode three, the water pressure increases, and the movable inner core 73 moves towards the output end of the nozzle housing 72 under pressure, compressing the return spring 74. At the same time, the multi-lobed movable block 76 is restricted by the constriction orifice shape 75 and retracts towards the center, reducing the inner diameter of the output end of the movable inner core 73. This cuts the water flow, forcing it to spray out and atomize. The discharge of impurities and the switching of atomized spray are achieved solely through water pressure control.

[0027] Among them, reference Figures 3-4 As shown, the side nozzles 7 are installed at the corresponding positions of the partition 25, and the partition 25 is provided with a slot 13. The slot 13 is used to guide the water flow on the partition 25 towards each side nozzle 7, so that impurities can be guided to enter the side nozzles 7 more effectively during the backwashing process.

[0028] In one embodiment, the nozzle housing 72 includes a first housing 77 and a second housing 78, which are movably connected. A movable inner core 73 is located inside the first housing 77. The first housing 77 is configured to swing around the second housing 78 when the movable inner core 73 is pressed and moves toward the output end of the nozzle housing 72, causing the output end of the second housing 78 to move away from the water controller 2. (See specific reference...) Figures 6-7 As shown, an airbag 10 is disposed between the first outer shell 77 and the second outer shell 78, so as to... Figure 7For example, airbags 10 are provided on both the upper and lower sides. In the initial state, the first outer shell 77 tends to be vertically downward. The area within the first outer shell 77 that is located in the moving region of the movable inner core 73 at least partially forms a piston cylinder 11. The outer wall of the movable inner core 73 extends outward and fits against the inner wall of the first outer shell 77 to form a piston head 12. The airbag 10 located on the lower side is connected to the piston cylinder 11 through the connecting channel 14. When the movable inner core 73 is pressed and moves towards the output end of the nozzle housing 72, it compresses the gas in the piston cylinder 11 and enters the airbag 10 on the lower side. The airbag 10 on the lower side expands and causes the first outer shell 77 to swing around the second outer shell 78 in a vertically upward direction, while simultaneously compressing the airbag on the upper side. 10. When the water pressure decreases, the movable inner core 73 resets, extracting the air from the lower airbag 10, causing the lower airbag 10 to contract. At the same time, the upper airbag 10 resets and squeezes the first outer shell 77 to swing around the second outer shell 78. This forms a side-path nozzle 7 that swings adaptively according to the water pressure. Combined with the above-mentioned modes two and three, during backwashing, the output end of the second outer shell 78 is basically in a vertically downward position so that the water carrying impurities flows vertically downward for subsequent collection and treatment. During atomized spraying, the second outer shell 78 can be automatically raised to the vertical direction to increase the effective spray area.

[0029] The embodiments of the present invention have been described in detail above with reference to the examples. However, the present invention is not limited to the above embodiments. For those skilled in the art, after learning the contents described in the present invention, several equivalent changes and substitutions can be made without departing from the principle of the present invention. These equivalent changes and substitutions should also be considered to fall within the protection scope of the present invention.

Claims

1. A dust suppression spraying system for construction sites, characterized in that: The device includes a base, a water controller, a high-pressure nozzle, and a driver. The water controller is rotatably mounted on the base, and its input end is used to connect to an external water supply pipeline. The output end of the water controller is connected to the high-pressure nozzle. The driver is configured to drive the water controller and the high-pressure nozzle to rotate 360° on the base. The water controller is provided with a first flow channel and a second flow channel, as well as a flow channel switch. The flow channel switch is configured to control the opening of the first flow channel and / or the second flow channel. Several side nozzles are installed on the outside of the water controller. When the first flow channel is open, it is configured to control the water flow to the high-pressure nozzle. When the second flow channel is open, it is configured to control the water flow to the side nozzle.

2. The dust suppression spraying equipment for construction sites according to claim 1, characterized in that: The input end of the water controller is equipped with an input pipe for connecting to an external water supply pipeline, and a driven gear is coaxially mounted on the input pipe. The driver includes a drive motor and a drive gear mounted on the output shaft of the drive motor, and the drive gear meshes with the driven gear.

3. The dust suppression spraying equipment for construction sites according to claim 1, characterized in that: The water controller's inner cavity includes an upper cavity and a lower cavity, which are directly separated by a partition. The first flow channel and the second flow channel are located in the upper cavity. The partition has a first through hole and a second through hole. The first through hole communicates with the first flow channel, and the second through hole communicates with the second flow channel. The flow channel switch includes an integrated piston with a first piston head and a second piston head. As the integrated piston moves, it is configured such that only the first piston head blocks the first through hole, or only the second piston head blocks the second through hole.

4. A construction site dust suppression spraying device according to claim 3, characterized in that: The first and second flow channels are defined as inlet ports at the ends near the corresponding first and second through holes, and outlet ports at the ends near the water controller. A filter screen is installed in the first flow channel. The integrated piston also has a third piston head. The side nozzle is connected to the second flow channel. The third piston head is configured as follows: When the first piston head blocks the first through hole, the third piston head opens the output port of the second flow channel and simultaneously blocks the output end of the water controller; the water flows through the second flow channel inlet, the second flow channel, the second flow channel outlet, the first flow channel outlet, the filter screen, and the first flow channel in sequence before entering the side spray head; When the second piston head blocks the second through hole, the third piston head blocks the output port of the second flow channel and simultaneously opens the output end of the water controller; the water flow passes through the first flow channel inlet, the first flow channel, and the first flow channel outlet in sequence, and enters the high-pressure nozzle from the output end of the water controller. When the water flow passes through the first flow channel, it is controlled to enter the side nozzle as needed.

5. A construction site dust suppression spraying device according to claim 3 or 4, characterized in that: A piston spring is installed between the first through hole and the first piston head and / or between the second through hole and the second piston head. The piston spring is configured to tend to drive the first piston head away from the first through hole and the second piston head to block the second through hole.

6. A construction site dust suppression spraying device according to claim 4, characterized in that: An electric valve is installed at the input end of the side nozzle.

7. A construction site dust suppression spraying device according to claim 4 or 6, characterized in that: The side-flow sprinkler includes a sprinkler housing and a movable inner core. The movable inner core is slidably installed inside the sprinkler housing along the water delivery direction of the sprinkler, and a return spring is installed between the movable inner core and the sprinkler housing. The output end of the sprinkler housing is a constricted nozzle shape, and the output end of the movable inner core is mainly formed by multiple movable blocks. The movable inner core is configured as follows: When the nozzle moves toward the output end of the nozzle housing under pressure, the return spring is compressed, and at the same time, the multi-lobed movable block is restricted by the shape of the constriction port and retracts toward the center, and the inner diameter of the output end of the movable inner core becomes smaller. When not under pressure, the movable inner core returns to its original position under the action of the return spring, and at the same time, the multi-lobed movable block is released from the shape restriction of the contraction opening, and the inner diameter of the output end of the movable inner core increases.

8. A construction site dust suppression spraying device according to claim 7, characterized in that: The side spray nozzles are installed at locations corresponding to the partition, and the partition has slots for guiding water flow on the partition toward each side spray nozzle.

9. A construction site dust suppression spraying device according to claim 7, characterized in that: The nozzle housing includes a first housing and a second housing, which are movably connected. The movable inner core is located inside the first housing. The first housing is configured to swing around the second housing when the movable inner core is pressed and moves toward the output end of the nozzle housing, causing the output end of the second housing to move away from the water controller.

10. A construction site dust suppression spraying device according to claim 9, characterized in that: An air bladder is provided between the first outer shell and the second outer shell, and at least part of the movable inner core moving area inside the first outer shell forms a piston cylinder. The outer wall of the movable inner core extends outward and fits against the inner wall of the first outer shell to form a piston head. The air bladder is connected to the piston cylinder. When the movable inner core is pressed and moves toward the output end of the nozzle outer shell, it squeezes the gas in the piston cylinder into the air bladder. The expansion of the air bladder causes the first outer shell to swing around the second outer shell, so that the output end of the second outer shell tends to move away from the water controller.

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