A spraying dust-settling device based on construction site dust detection

Abstract

The application belongs to the field of construction site dust reduction, and provides a spraying dust reduction device based on construction site dust detection, which comprises a support, a spraying pipeline arranged on the support, a water supply pipeline communicated to the spraying pipeline, a water pump installed on the water supply pipeline, and a spray head communicated with the spraying pipeline, further comprising a three-way reversing valve arranged between the water pump and the spraying pipeline, the three-way reversing valve having a water inlet, a spraying water outlet and a backwater outlet; the application movably arranges a baffle and a blocking plate driven by the baffle in the three-way reversing valve, so that after the water pump is stopped, the baffle automatically closes the water inlet under the action of a return spring, and the blocking plate synchronously opens the backwater outlet, thereby realizing automatic switching between the spraying mode and the backwater mode; the residual water in the spraying pipeline is returned to the water tank through the backwater pipeline under the action of gravity, thereby effectively avoiding the problem of ground water wetting and slipping caused by continuous dripping of the residual water from the spray head after the water pump is stopped, and the problem of pipeline cracking in winter, and saving water resources.

Description

Technical Field

[0001] This invention relates to dust suppression technology at construction sites, specifically to a spray dust suppression device based on dust detection at construction sites. Background Technology

[0002] With the accelerating pace of urbanization, the number and scale of construction sites continue to grow. During construction operations such as foundation excavation, backfilling, material loading and unloading, and concrete mixing, a large amount of dust is generated, causing serious pollution to the surrounding atmospheric environment and posing a threat to the health of on-site construction workers. Currently, dust suppression spraying has become one of the main methods for dust control at construction sites. By deploying spray pipelines in the construction area and automatically controlling the spraying operation at regular intervals or based on dust concentration, water mist adsorbs suspended dust particles in the air, achieving the purpose of dust suppression.

[0003] Existing dust suppression spray systems typically only have simple shut-off valves or solenoid valves between the spray pipes and water supply lines. After spraying operations are completed and the water pump stops supplying water, a large amount of residual water remains in the spray pipes and nozzles. Since construction sites often consist of exposed soil or paved surfaces, this residual water continues to drip from the nozzles even after the system is shut down, causing the sprayed area to remain slippery for extended periods. This poses a serious safety hazard, as workers are highly susceptible to slipping and falling. Furthermore, waterlogged areas prevent subsequent construction work, such as plastering and tiling, which require a high degree of dryness, directly impacting construction progress. In cold weather, the residual water may freeze, causing the pipes and nozzles to crack, damaging the system and increasing maintenance costs. Summary of the Invention

[0004] The purpose of this invention is to provide a spray dust suppression device based on dust detection at construction sites, in order to solve the problem that in the prior art, the residual water in the spray pipeline cannot be automatically recovered after the spray dust suppression device based on dust detection at construction sites is shut down, resulting in continuous dripping from the nozzles, causing the ground to be slippery and wasting resources.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a spray dust suppression device based on dust detection at a construction site, comprising a support frame, a spray pipe mounted on the support frame, a water supply pipe connected to the spray pipe, a water pump installed on the water supply pipe, and a nozzle connected to the spray pipe, and further comprising...

[0006] A three-way reversing valve is installed between the water pump and the spray pipeline. The three-way reversing valve has an inlet, a spray outlet and a return outlet. The inlet is connected to the outlet of the water pump, the spray outlet is connected to the spray pipeline, the return outlet is connected to the return pipeline, and the end of the return pipeline is connected to the water tank.

[0007] A baffle, which is movably installed inside the three-way reversing valve, is used to seal the inlet in real time.

[0008] The blocking plate is movably installed at the return water outlet of the three-way reversing valve and is driven by the baffle.

[0009] The nozzle is connected to the spray pipe via a detachable mechanism.

[0010] Furthermore, a limit rod is fixedly installed inside the three-way reversing valve. The limit rods are evenly distributed on the inner side of the three-way reversing valve. The limit rods pass through the baffle and slide with it. An anti-detachment cover is fixedly installed on the upper end of the limit rod.

[0011] Furthermore, a return spring is sleeved on the outer side of the limiting rod, and the two ends of the return spring are respectively connected to the side wall of the baffle and the side wall of the anti-detachment cover.

[0012] Furthermore, an annular groove is provided on the inner side wall of the return water outlet of the three-way reversing valve, and a sealing plate is slidably arranged in the annular groove. A connecting rod is fixedly installed on the side wall of the baffle, and the other end of the connecting rod is fixedly connected to the side wall of the sealing plate.

[0013] Furthermore, an annular groove is provided on the upper surface of the inlet of the three-way reversing valve, and a sealing gasket is fixedly installed on the lower side of the baffle, with the sealing gasket extending into the annular groove and sliding therewith.

[0014] Furthermore, a sealing plug is fixedly installed on the lower surface of the baffle, and the radius of the sealing plug is the same as the radius of the water inlet.

[0015] Furthermore, an expansion section is provided at the inlet of the return water pipeline, located at one end of the return water outlet, and its flow cross-section gradually expands along the direction of residual water flow.

[0016] Furthermore, each of the three ports of the three-way reversing valve is fixedly equipped with a flange, which is fixedly connected to the spray pipeline, water supply pipeline and return water pipeline through the flange.

[0017] Furthermore, the detachable mechanism includes an external thread on the side wall of the nozzle, and an internal thread at the connection between the spray pipe and the nozzle, wherein the nozzle and the spray pipe are fixedly connected by the thread.

[0018] Furthermore, the upper inner wall of the three-way reversing valve is provided with an arc-shaped surface.

[0019] Compared with existing technologies, the present invention provides a dust suppression spraying device based on dust detection at construction sites. By movably installing a baffle and a sealing plate driven by the baffle inside a three-way reversing valve, the baffle automatically closes the water inlet under the action of a return spring after the water pump stops, and the sealing plate simultaneously opens the return water outlet, realizing automatic switching between spraying mode and return water mode. The residual water in the spraying pipeline flows back to the water tank under the action of gravity through the return water pipeline, effectively avoiding the problem of wet and slippery ground caused by continuous dripping of residual water from the nozzles after shutdown and the freezing and cracking of pipelines in winter, thus saving water resources. At the same time, through the detachable connection between the nozzle and the spraying pipeline, operators can easily remove the nozzle for cleaning or replacement without disassembling the entire spraying arm, which greatly reduces maintenance difficulty and repair costs, and improves the work efficiency and safety at the construction site. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0021] Figure 1 This is a schematic diagram of the overall structure provided for an embodiment of the present invention;

[0022] Figure 2 This is a cross-sectional view of an embodiment of the present invention;

[0023] Figure 3 for Figure 2 Enlarged view of the structure at point A in the middle;

[0024] Figure 4 This is a cross-sectional view of the three-way directional valve in this invention;

[0025] Figure 5 This is a schematic diagram of the baffle structure in this invention;

[0026] Figure 6 This is a schematic diagram of the nozzle structure in this invention.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Sprinkler pipe; 2. Water supply pipe; 3. Return water pipe; 4. Sprinkler head; 5. Three-way reversing valve; 6. Water inlet; 7. Sprinkler outlet; 8. Return water outlet; 9. Baffle; 10. Sealing plate; 11. Limiting rod; 12. Anti-detachment cover; 13. Return spring; 14. Annular groove; 15. Connecting rod; 16. Annular groove; 17. Sealing gasket; 18. Sealing plug; 19. Expansion section; 20. Flange; 21. External thread; 22. Arc-shaped surface. Detailed Implementation

[0029] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0030] As attached Figure 1 To be continued Figure 6 As shown:

[0031] Example 1:

[0032] This invention provides a dust suppression spraying device based on dust detection at a construction site, comprising a support frame, a spraying pipeline 1 mounted on the support frame, a water supply pipeline 2 connected to the spraying pipeline 1, a water pump installed on the water supply pipeline 2, and nozzles 4 connected to the spraying pipeline 1. The spraying pipeline 1 is a water flow channel connecting a three-way reversing valve 5 and each nozzle 4. During spraying operation, it serves as a high-pressure water delivery channel, distributing the water flow through the three-way reversing valve 5 to the nozzles 4 for dust suppression. During shutdown and water return operation, it also serves as a residual water return channel, allowing residual water in the pipeline to flow through the three-way reversing valve 5 under gravity and enter the return water pipeline 3. This pipeline has a tubular structure and is arranged horizontally or inclined on the support frame at the construction site. Its direction and length are determined according to the actual dust suppression coverage area, and the nozzles 4 are spaced apart along its length.

[0033] Water supply pipe 2 is connected between the water pump outlet and the inlet 6 of the three-way reversing valve 5. It is the primary channel for water to enter the entire sprinkler system after the water pump pressurizes. When the water pump is running, the normal pressure water is pressurized by the water pump and sent to the three-way reversing valve 5 through the water supply pipe 2, and then enters the sprinkler pipe 1. The water supply pipe 2 only has high pressure water flow inside when the water pump is working. After the water pump stops, its internal pressure disappears. Also, because the baffle 9 of the three-way reversing valve 5 closes the inlet 6, the water in the water supply pipe 2 will not enter the sprinkler pipe 1.

[0034] The return water pipe 3 connects the return water outlet 8 of the three-way reversing valve 5 to the water tank. It is a dedicated channel for residual water recovery. When the device switches from spray mode to return water mode, the residual water in the spray pipe 1 enters the return water pipe 3 through the three-way reversing valve 5 and flows into the water tank along the return water pipe 3, realizing the recovery and reuse of residual water. The interior of the return water pipe 3 is usually inclined downward or vertically to facilitate the flow of residual water under gravity. In addition, an expansion section 19 is provided at the inlet of the return water pipe 3 to form a Venturi structure to produce a suction effect, further accelerating the return of residual water.

[0035] A three-way directional valve 5 is installed between the water pump and the spray pipe 1. The three-way directional valve 5 has an inlet 6, a spray outlet 7, and a return outlet 8. The inlet 6 is connected to the water pump outlet, the spray outlet 7 is connected to the spray pipe 1, and the return outlet 8 is connected to the return pipe 3. The end of the return pipe 3 is connected to the water tank. The internal chamber provides installation space and movement guidance for each moving part. During spray operation, its internal passage is open from the inlet 6 to the spray outlet 7; during shutdown and return water operation, its internal passage is open from the spray outlet 7 to the return outlet 8. The valve body connects to the water supply pipe 2, the spray pipe 1, and the return pipe 3 through three ports, structurally integrating the three into a single unit. The arc-shaped surface 22 on the inner wall of the valve body helps guide the water flow direction and reduce flow resistance.

[0036] The return water outlet 8 is located on the lower part or bottom of the side wall of the three-way reversing valve 5 and is connected to the return water pipeline 3. It is the outlet for water flow in the residual water recovery state. A sealing plate 10 is installed at this outlet. In the spray operation state, the sealing plate 10 is closed to prevent high-pressure water from leaking from this outlet. In the shutdown return water state, the sealing plate 10 is opened to allow the residual water in the valve body to flow into the return water pipeline 3. The inner side wall of the return water outlet 8 is provided with an annular sliding groove 14 to guide and limit the sliding of the sealing plate 10.

[0037] A baffle 9, movably mounted inside the three-way reversing valve 5, is used to close the inlet 6 in real time. The baffle 9 is a plate-shaped structure, with a limiting rod 11 passing through it and constraining its direction of movement. When the water pump is running, the water pressure at the inlet 6 acts on the lower surface of the baffle 9, overcoming the elastic force of the return spring 13 and the weight of the baffle 9 itself, pushing the baffle 9 upward to the first position. At this time, the inlet 6 is open, and water flows smoothly into the valve body and out of the spray outlet 7. After the water pump stops running, the water pressure at the inlet 6 disappears, and the baffle 9 moves downward to the second position under the combined action of the elastic force of the return spring 13 and its own weight, closing the inlet 6. The up-and-down movement of the baffle 9 simultaneously drives the sealing plate 10 to move in the opposite direction via the connecting rod 15 (i.e., when the baffle 9 rises, the sealing plate 10 closes the return water outlet 8; when the baffle 9 falls, the sealing plate 10 opens the return water outlet 8), achieving synchronous switching between the spray mode and the return water mode. A sealing gasket 17 and a sealing plug 18 are also fixedly installed on the lower surface of the baffle 9 to ensure the sealing reliability when the inlet 6 is closed.

[0038] The sealing plate 10 is movably mounted at the return water outlet 8 of the three-way reversing valve 5 and is driven by the baffle 9. The sealing plate 10 is directly actuated at the return water outlet 8 of the three-way reversing valve 5 and driven by the baffle 9 via the connecting rod 15, serving as the direct actuator for opening and closing the return water outlet 8 as needed. It is a plate-shaped or ring-shaped structure that mates with the annular groove 14, slidingly mounted in the annular groove 14 on the inner wall of the return water outlet 8. When the baffle 9 is in the first position (spraying operation state), the baffle 9 drives the sealing plate 10 to move to a position that closes the return water outlet 8 via the connecting rod 15, preventing high-pressure water from leaking from the return water outlet 8. When the baffle 9 falls to the second position (shutdown return water state), the baffle 9 drives the sealing plate 10 to move in the opposite direction via the connecting rod 15, opening the return water outlet 8 and allowing residual water in the valve body to flow smoothly into the return water pipeline 3. The blocking plate 10 moves in the opposite direction to the baffle 9, and the two are linked by the connecting rod 15.

[0039] The nozzle 4 is detachably connected to the spray pipe 1.

[0040] Preferably, a limit rod 11 is fixedly installed inside the three-way directional valve 5. The limit rods 11 are evenly distributed at angles on the inner side of the three-way directional valve 5. The limit rods 11 pass through the baffle 9 and slide therewith. An anti-detachment cover 12 is fixedly installed on the upper end of the limit rod 11. The limit rods 11 are fixedly installed inside the three-way directional valve 5, pass through the baffle 9 and slide therewith. Multiple limit rods 11 are evenly distributed at angles on the inner side of the three-way directional valve 5, together forming the guiding system of the baffle 9, ensuring that the baffle 9 can only move in the vertical direction. The baffle 9 moves up and down to prevent it from tilting, rotating, or getting stuck under the impact or vibration of water flow. This ensures that the sealing plug 18 can be accurately aligned and inserted into the inlet 6 each time the baffle 9 descends. The upper end of the limiting rod 11 is fixedly equipped with an anti-detachment cover 12, and the lower end is fixed to a mounting seat on the bottom or side wall of the valve body. The anti-detachment cover 12 is fixedly installed on the upper end of the limiting rod 11, and its diameter or outer dimension is larger than that of the limiting rod 11 itself. Together with the limiting rod 11, it forms a limiting structure for the upward movement of the baffle 9. When the water pump is running and the water pressure pushes the baffle 9 upward to the first position, the upper surface of the baffle 9 abuts against the lower surface of the anti-detachment cover 12. The anti-detachment cover 12 prevents the baffle 9 from continuing to move upward, limiting the highest working position of the baffle 9. At the same time, the anti-detachment cover 12 also provides upper support and a point of force for the return spring 13 sleeved on the outside of the limiting rod 11, so that the return spring 13 can apply elastic force between the baffle 9 and the anti-detachment cover 12.

[0041] Specifically, a return spring 13 is sleeved on the outer side of the limiting rod 11. The two ends of the return spring 13 are connected to the side walls of the baffle 9 and the anti-detachment cover 12, respectively. The return spring 13, sleeved on the outer side of the limiting rod 11, is an energy storage element that provides downward reset driving force for the baffle 9. When the water pump is running, the baffle 9 moves upward under water pressure, compressing the return spring 13 and storing elastic potential energy. When the water pump stops running and the water pressure at the inlet 6 disappears, the return spring 13 releases the stored elastic potential energy, applying a downward elastic force to the baffle 9. This, combined with the weight of the baffle 9 itself, pushes the baffle 9 downward to the second position, closing the inlet 6. The number of return springs 13 corresponds to the number of limiting rods 11, and they are distributed at equal angles to ensure uniform force on the baffle 9 and prevent the baffle 9 from tilting.

[0042] Specifically, an annular groove 16 is formed on the upper surface of the inlet 6 of the three-way reversing valve 5. A sealing gasket 17 is fixedly installed on the lower side of the baffle 9. The sealing gasket 17 extends into the annular groove 16 and slides therewith. The annular groove 16 is a groove structure that surrounds the circumference of the inlet 6 on the upper surface of the three-way reversing valve 5. It forms an interlocking fit with the sealing gasket 17 fixedly installed on the lower side of the baffle 9. The sealing gasket 17 extends into the annular groove 16 and fits tightly (sliding) therewith, forming a labyrinth-type or interlocking sealing structure. Compared with a simple planar seal, this sealing method has a longer sealing path and a better sealing effect, which can effectively prevent water leakage at the inlet 6 under high pressure or siphon action. The sealing gasket 17 is usually made of rubber, polyurethane, or other elastic and wear-resistant materials. When the baffle 9 is in the second position, the sealing gasket 17 is inserted into the annular groove 16 and, under the pressure of the return spring 13, tightly adheres to the inner wall of the annular groove 16, forming a reliable sealing interface and cutting off the communication between the inlet 6 and the internal chamber of the valve body. The elastic deformation capability of the sealing gasket 17 can compensate for the fitting clearance caused by machining errors or wear, ensuring the long-term effectiveness of the seal.

[0043] Furthermore, a sealing plug 18 is fixedly installed on the lower surface of the baffle 9. The radius of the sealing plug 18 is the same as that of the inlet 6. The sealing plug 18 is fixedly installed in the center of the lower surface of the baffle 9, and its radius is the same as (or slightly larger than) that of the inlet 6. It is a component that is directly inserted into the inlet 6 to block and seal it. The material of the sealing plug 18 can be rubber, polyurethane, or metal-coated rubber, etc. When the baffle 9 is in the second position, the sealing plug 18 moves downward with the baffle 9 and is inserted into the inlet 6. The tight fit between its outer wall and the inner wall of the inlet 6 directly seals the inlet 6. The sealing plug 18 and the sealing gasket 17 form a double sealing structure—the sealing plug 18 acts as the main seal to directly block the inlet 6 channel, and the cooperation between the sealing gasket 17 and the annular groove 16 acts as an auxiliary seal to further isolate possible leakage paths, thereby ensuring that the inlet 6 is absolutely sealed and leak-proof when the machine is stopped.

[0044] Working principle: Before the device starts, the baffle 9 inside the three-way reversing valve 5 is at its lowest point under the action of the spring force of the return spring 13 and its own weight. The sealing plug 18 on the lower surface of the baffle 9 is inserted into the water inlet 6, and the sealing gasket 17 is embedded in the annular groove 16, sealing the water inlet 6. At the same time, the baffle 9 drives the sealing plate 10 through the connecting rod 15 to close the return water outlet 8. When the water pump starts, the atmospheric pressure water is pressurized by the water pump and enters the water inlet 6 of the three-way reversing valve 5 through the water supply pipeline 2. The water pressure at the water inlet 6 acts on the lower surface of the baffle 9. When the upward thrust generated by the water pressure is greater than the sum of the spring force of the return spring 13 and the weight of the baffle 9, the baffle 9 slides upward along the limit rod 11 under the push of the water pressure. The sealing plug 18 is pulled out from the water inlet 6, and the sealing gasket 17 is withdrawn from the annular groove 16, and the water inlet 6 is fully opened. During the ascent of the baffle 9, the connecting rod 15 drives the sealing plate 10 to slide along the annular groove 14, completely sealing the return water outlet 8. At this time, the channel between the inlet 6 and the spray outlet 7 is unobstructed, and high-pressure water enters the spray pipe 1 through the spray outlet 7 and is sprayed through each nozzle 4 to suppress dust. When the baffle 9 rises to its highest position, the upper surface of the baffle 9 abuts against the anti-detachment cover 12, maintaining a stable spray operation.

[0045] Example 2:

[0046] This embodiment is basically the same as the previous embodiment, except that an annular groove 14 is provided on the inner wall of the return water outlet 8 of the three-way reversing valve 5. The annular groove 14 is formed on the inner wall of the return water outlet 8 of the three-way reversing valve 5 and serves as the installation and movement guide structure for the sealing plate 10. The sealing plate 10 is slidably disposed within the annular groove 14 and can reciprocate along the axial direction of the return water outlet 8 within the range defined by the groove. The width and depth of the annular groove 14 are adapted to the thickness and outer diameter of the sealing plate 10, ensuring that the sealing plate 10 always maintains its fit with the groove during the sliding process and will not come off or deviate, thereby ensuring the accuracy and reliability of the opening and closing action of the sealing plate 10 on the return water outlet 8. Meanwhile, the annular groove 14 also limits the stroke of the sealing plate 10, restricting its opening and closing extreme positions. The sealing plate 10 is slidably disposed within the annular groove 14. A connecting rod 15 is fixedly installed on the side wall of the baffle 9. The other end of the connecting rod 15 is fixedly connected to the side wall of the sealing plate 10. The connecting rod 15 is the key transmission element for realizing the linkage between the baffle 9 and the sealing plate 10. One end of the connecting rod 15 is fixedly installed on the side wall of the baffle 9, and the other end is fixedly connected to the side wall of the sealing plate 10. When the baffle 9 moves up and down under the action of water pressure or spring force, the baffle 9 transmits the motion to the sealing plate 10 through the connecting rod 15, driving the sealing plate 10 to slide synchronously in opposite directions within the annular groove 14. The number of connecting rods 15 can be single or multiple. Their length and rigidity should meet the transmission requirements to ensure that even small displacements of the baffle 9 can be accurately transmitted to the sealing plate 10, avoiding lag or incomplete movement of the sealing plate 10 due to deformation or loosening.

[0047] Furthermore, an expansion section 19 is provided at the inlet of the return water pipe 3, located at one end of the outlet. Its flow cross-section gradually expands along the direction of residual water flow. The contraction section is naturally formed by the return water outlet of the three-way reversing valve 5. A throat is formed between the return water pipe 3 and the expansion section 19. After the residual water is accelerated by the contraction section, it enters the expansion section 19 through the throat, forming a local low-pressure zone in the expansion section 19, which has a suction effect on the residual water in the spray pipe 1.

[0048] Working Principle: After the spraying operation ends and the water pump stops running, the water pressure at the inlet 6 of the water supply pipeline 2 and the three-way reversing valve 5 gradually disappears. The lower surface of the baffle 9 loses the upward thrust of the water pressure, and the return spring 13 releases its stored elastic potential energy, which, together with the weight of the baffle 9 itself, pushes the baffle 9 downwards along the limit rod 11. During the downward movement of the baffle 9, the sealing plug 18 moves down and inserts into the inlet 6, and the sealing gasket 17 embeds into the annular groove 16, completely sealing the inlet 6 and cutting off the connection between the water supply pipeline 2 and the valve body. At the same time, the baffle 9 drives the sealing plate 10 to slide in the opposite direction along the annular groove 14 via the connecting rod 15, opening the return water outlet 8. At this time, the channel between the spray outlet 7 and the return water outlet 8 is unobstructed, and the residual water in the spray pipeline 1 flows back to the valve body of the three-way reversing valve 5 under gravity through the spray outlet 7, and then flows into the return water pipeline 3 through the return water outlet 8. When the residual water flows through the expansion section 19 at the inlet of the return water pipe 3, the negative pressure suction effect generated by the Venturi effect further accelerates the return of the residual water, and finally all of it flows into the water tank, realizing the automatic recycling of residual water.

[0049] Example 3:

[0050] This embodiment is basically the same as the previous embodiment, except that flanges 20 are fixedly installed on all three ports of the three-way directional valve 5. These flanges 20 are used to connect the valve to the spray pipe 1, the water supply pipe 2, and the return water pipe 3. Using the flanges 20, gaskets 17, and fastening bolts, the three-way directional valve 5 can be reliably connected between the pipes, providing high connection strength, good sealing, and easy disassembly and maintenance. The flanges 20 are standard parts or non-standard parts designed according to standards, and bolt holes are provided on their flange surfaces for inserting connecting bolts.

[0051] Furthermore, the detachable mechanism includes an external thread 21 on the side wall of the nozzle 4 and an internal thread at the connection between the spray pipe 1 and the nozzle 4. The nozzle 4 and the spray pipe 1 are fixedly connected by the thread. With this threaded connection, the operator only needs to manually tighten the screw to install or remove the nozzle 4 without the need for professional tools. When the nozzle 4 becomes clogged or damaged due to dust after long-term use, the operator can easily unscrew the nozzle 4 from the spray pipe 1 for cleaning or replacement without disassembling the entire spray arm, significantly reducing maintenance difficulty and repair costs.

[0052] Working Principle: When the nozzle 4 becomes clogged with dust or its atomization effect deteriorates due to prolonged use, the operator can remove it from the spray pipe 1 without disassembling the spray arm or using specialized tools. Simply hold the nozzle 4 by hand and rotate it counterclockwise. The external thread 21 on the side wall of the nozzle 4 gradually disengages from the internal thread on the spray pipe 1, allowing the nozzle 4 to be unscrewed. After cleaning the removed nozzle 4 or replacing it with a new one, align the installation end of the nozzle 4 with the connection port of the spray pipe 1 and manually rotate it clockwise. The external thread 21 gradually engages and locks with the internal thread, completing the installation of the nozzle 4. The entire disassembly and assembly process requires only manual operation, without the need for tools, significantly reducing maintenance time and improving equipment maintenance efficiency at the construction site.

[0053] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A dust suppression spraying device based on dust detection at a construction site, comprising a support frame, a spraying pipeline (1) mounted on the support frame, a water supply pipeline (2) connected to the spraying pipeline (1), a water pump installed on the water supply pipeline (2), and a spray nozzle (4) connected to the spraying pipeline (1), characterized in that, Also includes A three-way reversing valve (5) is installed between the water pump and the spray pipe (1). The three-way reversing valve (5) has an inlet (6), a spray outlet (7) and a return outlet (8). The inlet (6) is connected to the outlet of the water pump, the spray outlet (7) is connected to the spray pipe (1), and the return outlet (8) is connected to the return pipe (3). The end of the return pipe (3) is connected to the water tank. A baffle (9) is movably installed inside the three-way reversing valve (5) to seal the inlet (6) in real time. The sealing plate (10) is movably installed at the return water outlet (8) of the three-way reversing valve (5) and is driven by the baffle (9); The nozzle (4) is connected to the spray pipe (1) by a detachable mechanism.

2. The dust suppression spraying device based on construction site dust detection according to claim 1, characterized in that, The three-way reversing valve (5) is internally fixedly installed with a limit rod (11). The limit rod (11) is distributed at equal angles on the inner side of the three-way reversing valve (5). The limit rod (11) passes through the baffle (9) and slides therewith. The upper end of the limit rod (11) is fixedly installed with an anti-detachment cover (12).

3. A spray dust suppression device based on construction site dust detection according to claim 2, characterized in that, The outer side of the limiting rod (11) is fitted with a reset spring (13), and the two ends of the reset spring (13) are respectively connected to the side wall of the baffle (9) and the side wall of the anti-detachment cover (12).

4. A spray dust suppression device based on construction site dust detection according to claim 1, characterized in that, The inner wall of the return water outlet (8) of the three-way reversing valve (5) is provided with an annular groove (14), and a sealing plate (10) is slidably arranged in the annular groove (14). A connecting rod (15) is fixedly installed on the side wall of the baffle (9), and the other end of the connecting rod (15) is fixedly connected to the side wall of the sealing plate (10).

5. A spray dust suppression device based on construction site dust detection according to claim 1, characterized in that, The inlet (6) of the three-way reversing valve (5) has an annular groove (16) on its upper surface. A sealing gasket (17) is fixedly installed on the lower side of the baffle (9). The sealing gasket (17) extends into the annular groove (16) and slides therewith.

6. A spray dust suppression device based on construction site dust detection according to claim 5, characterized in that, A sealing plug (18) is fixedly installed on the lower surface of the baffle (9), and the radius of the sealing plug (18) is the same as the radius of the inlet (6).

7. A spray dust suppression device based on construction site dust detection according to claim 1, characterized in that, An expansion section (19) is provided at the inlet of the return water pipe (3), located at one end of the return water outlet (8), and its flow cross section gradually expands along the direction of residual water flow.

8. A spray dust suppression device based on construction site dust detection according to claim 1, characterized in that, The three-way reversing valve (5) has flanges (20) fixedly installed on all three ports, and is fixedly connected to the spray pipe (1), water supply pipe (2) and return water pipe (3) through the flanges (20).

9. A spray dust suppression device based on construction site dust detection according to claim 1, characterized in that, The detachable mechanism includes an external thread (21) on the side wall of the nozzle (4), and an internal thread at the connection between the spray pipe (1) and the nozzle (4). The nozzle (4) and the spray pipe (1) are fixedly connected by the thread.

10. A spray dust suppression device based on construction site dust detection according to claim 1, characterized in that, The upper inner wall of the three-way reversing valve (5) is provided with an arc-shaped surface (22).

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