Dustproof device for construction site based on green construction

Abstract

The present application relates to dustproof device technical field, specifically for a kind of dustproof device based on green construction for construction site, including fog gun machine, fog gun machine includes wind cylinder, the air outlet of wind cylinder is fixed with square barrel nozzle, square barrel nozzle inside is equipped with spray mechanism, spray mechanism can be sprayed water mist towards parallel to wind cylinder axis direction or towards the outside direction away from wind cylinder axis or towards the inside direction close to wind cylinder axis, to adapt to the dust suppression needs of different operation scenarios.The present application is cooperated by driving mechanism and spray mechanism, so that nozzle can be inclined towards the outside direction away from wind cylinder axis, present divergent form, suitable for high-altitude operation scenarios such as material stacking, can also gradually be parallel to wind cylinder axis or inclined towards the direction close to wind cylinder axis, so as to present convergent form, suitable for flat ground operation, ditch operation and other work scenarios with low dust height and dust area concentration, improve the applicability of equipment to different scenarios and different needs.

Description

Technical Field

[0001] This invention relates to the field of dust control technology, specifically a dust control device for construction sites based on green construction practices. Background Technology

[0002] In the field of construction engineering, in order to make the construction process more green and environmentally friendly, dust control devices are usually used to suppress dust on construction sites. Among them, fog cannons are widely used in high-dust scenarios such as material stockpiling, earthwork excavation, and demolition operations due to their advantages of long spray distance and wide coverage.

[0003] In existing technology, fog cannons mainly consist of an air supply system, a spraying system, and a direction adjustment system. When in use, the atomizing nozzles in the spraying system spray water mist, and the air duct in the air supply system carries the water mist to the dusty area. The direction adjustment system is used to adjust the orientation and angle of the air duct, so that the water mist can be delivered to different construction areas to suppress dust and achieve green construction on the construction site.

[0004] However, in existing fog cannons, the nozzles are fixed at the air outlet of the duct, with a constant angle, usually parallel to the duct's axis. This results in a consistently unchanging diffusion direction and range of the water mist, affecting the device's applicability to different dust-generating scenarios. For example, targeted spraying methods are needed for scenarios such as material stacking, ditching, and leveling to achieve better dust suppression. Specifically, when stacking materials, the working height is higher than the fog cannon's height, causing dust from the top of the pile to diffuse outwards at high altitudes. When the existing fog cannon's duct is pointed upwards, the nozzles and duct can only deliver a straight line of water mist, failing to form a large-scale annular water mist curtain, which is insufficient to cover a large dust-generating area at higher altitudes, leading to poor dust suppression. Therefore, this invention proposes a dust control device for construction sites based on green construction principles to effectively address these shortcomings. Summary of the Invention

[0005] The purpose of this invention is to provide a dust control device for construction sites based on green construction, in order to solve the problems mentioned in the background art.

[0006] The present invention is achieved through the following technical solution: a dust suppression device for construction sites based on green construction, including a fog cannon, wherein the fog cannon includes a wind tunnel, a square nozzle is fixedly provided at the air outlet of the wind tunnel, and a spraying mechanism is installed on the inner side of the square nozzle. The spraying mechanism can spray water mist in a direction parallel to the axis of the wind tunnel, or in a direction away from the axis of the wind tunnel, or in a direction close to the axis of the wind tunnel, so as to adapt to the dust suppression needs of different work scenarios. The spraying mechanism includes four spray pipes, which are distributed in a circular pattern around the square nozzle. The two sides of each spray pipe are rotatably connected to the square nozzle via a rotating shaft parallel to its own axis. A torsion spring is sleeved on the outside of the rotating shaft. The torsion spring always applies an elastic force to the spray pipe, causing it to rotate towards the direction of the air duct axis. A traction rope is fixedly connected to the spray pipe, and a drive mechanism is provided on the air duct to the end of the traction rope away from the spray pipe. The drive mechanism can drive the end of the traction rope away from the spray pipe to move along the axial direction of the air duct towards or away from the square nozzle. When the drive mechanism drives the traction rope away from the spray pipe from the end near the square nozzle to the direction away from the square nozzle, the spray direction of the spray pipe can change sequentially from the direction close to the wind tunnel axis, to the direction parallel to the wind tunnel axis, and to the direction away from the wind tunnel axis.

[0007] Optionally, the outer wall of the air duct is fixedly provided with four slide rails along its own axis. The four slide rails are circumferentially distributed and correspond one-to-one with the four traction ropes. The end of the traction rope away from the spray pipe is fixedly provided with a slider, and the slider is slidably disposed on the slide rail along the axis of the air duct.

[0008] Optionally, the driving mechanism includes four electromagnets, which are slidably arranged on the slide rail along the axial direction of the air duct and correspond one-to-one with the four sliders. When the electromagnets are energized, the electromagnets and the sliders are attracted together, and the electromagnets can drive the sliders to move synchronously. When the electromagnets are de-energized, the sliders move towards the square nozzle under the action of the torsion spring.

[0009] Optionally, the four electromagnets are connected to a drive ring on the side away from the air duct. The drive ring is slidably sleeved on the outside of the air duct along the axial direction of the air duct. The drive mechanism also includes a cylinder fixedly mounted on the air duct and used to control the movement of the drive ring along the axial direction of the air duct.

[0010] Optionally, the spraying direction of the spraying mechanism includes at least the following four: When the angle between the air duct and the ground is within the first angle range, the four spray pipes spray water mist in a direction away from the axis of the air duct. When the angle between the air duct and the ground is within the second angle range, the four spray pipes spray water mist in a direction parallel to the axis of the air duct. When the angle between the air duct and the ground is in the third angle range, the four spray pipes spray water mist in the direction close to the inner side of the air duct axis. When the angle between the air duct and the ground is in the fourth angle range, the electromagnets in the left and right positions of the air duct are de-energized, and the spray pipes in the left and right positions of the square nozzle spray water mist in the direction close to the axis of the air duct under the action of the torsion spring. The electromagnet at the bottom of the air duct is energized, and the spray pipe at the bottom of the square nozzle sprays water mist in the direction away from the axis of the air duct under the drive of the drive mechanism. A power supply and a control module for controlling the power on and off of different electromagnets are installed on the base. A high-precision tilt sensor is fixedly installed on the outer wall of the duct to detect the pitch angle of the duct, which serves as the trigger signal for the electromagnet to be energized or de-energized.

[0011] Optionally, the two spray pipes located above and below the square nozzle are on the same vertical plane, and the two spray pipes located to the left and right of the square nozzle are on the same vertical plane. The two vertical planes are parallel to each other, and a clearance is reserved between the rotating shaft extending in the vertical direction and the rotating shaft extending in the horizontal direction to ensure that the flipping action of the spray pipes located above and below and the spray pipes located to the left and right does not interfere with each other.

[0012] Optionally, one end of the rotating shaft is rotatably connected to the inner wall of the square nozzle via a damping bearing, and the other end of the rotating shaft is fixedly connected to the spray pipe. One end of the torsion spring is fixedly connected to the inner wall of the square nozzle, and the other end of the torsion spring is fixedly connected to the rotating shaft.

[0013] Optionally, the square nozzle has notches on all four sides (top, bottom, left, and right), and the length of the notches is not less than the length of the spray tube.

[0014] Optionally, each of the four spray pipes is fixedly provided with a number of nozzles on the side away from the air duct, and the number of nozzles located on the same spray pipe are evenly distributed along the length direction of the corresponding spray pipe.

[0015] Optionally, each of the four spray pipes is fixedly connected to a flexible hose that communicates with its own inner cavity. A water guide pipe is fixedly sleeved on the outer wall of the air duct. The ends of the four flexible hoses away from the spray pipes are connected to the water guide pipe and communicate with the inner cavity of the water guide pipe. The outer wall of the water guide pipe has an inlet for connecting to an external water source.

[0016] Compared with existing technologies, the present invention provides a dust control device for construction sites based on green construction, which has the following beneficial effects: 1. This invention utilizes the cooperation of a drive mechanism and a spray mechanism. A cylinder controls the drive ring to move along the axial direction of the air duct, and a traction rope pulls the spray pipe to change its tilt angle. A torsion spring keeps the traction rope taut, so that when the drive ring moves away from the nozzle, the nozzle tilts outward away from the axis of the air duct, forming a divergent shape. This allows the water mist sprayed from the nozzle to form an annular water curtain under the action of the air duct, greatly expanding the coverage area of ​​the water mist. This is suitable for dusty scenarios at high altitudes, such as when materials are piled up. When the drive ring moves closer to the nozzle, the nozzle gradually becomes parallel to the axis of the air duct or tilts towards the axis of the air duct. The nozzle gradually becomes a converging flow shape, which is suitable for working scenarios with low dust height and concentrated dust areas, such as flat ground operations and ditch operations. 2. This invention incorporates an electromagnet on the drive ring. By switching the electromagnet on and off, it connects or disconnects from the slider. This allows the mist cannon to tilt towards the axis of the wind tunnel during dust suppression operations in ditches, creating a concentrated flow that directly targets the dusty areas within the ditch. Meanwhile, the lower spray pipe, driven by the electromagnet and drive ring, tilts away from the axis of the wind tunnel. This ensures the lower spray pipe can spray water towards the area near the mist cannon within the ditch, preventing the mist cannon from failing to reach the area near it even when tilted to its maximum angle. This ensures the lower spray pipe's spray range covers the dust suppression blind spots within the ditch, further enhancing the dust suppression effect during ditch operations. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the air duct structure of the present invention; Figure 3 This is a schematic diagram of the spray mechanism structure of the present invention; Figure 4 This is a front view of the spray mechanism of the present invention; Figure 5 This is a side sectional view of the spray mechanism and drive mechanism of the present invention; Figure 6 This is a side sectional view of the drive mechanism of the present invention; Figure 7 for Figure 3 Enlarged structural diagram at point A in the middle; Figure 8 for Figure 4 Enlarged structural diagram at point B.

[0018] In the diagram: 1. Air duct; 101. Square nozzle; 102. Slide rail; 2. Spraying mechanism; 201. Spray pipe; 202. Rotating shaft; 203. Torsion spring; 204. Nozzle; 205. Hose; 206. Water guide pipe; 3. Traction rope; 301. Slider; 4. Drive mechanism; 401. Electromagnet; 402. Drive ring; 403. Cylinder. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figure 1 - Figure 8 This application proposes a dust suppression device for construction sites based on green construction principles, including a fog cannon. The fog cannon includes a duct 1, with a square nozzle 101 fixedly installed at the air outlet of the duct 1. The fog cannon also includes a base for mounting the duct 1, on which a pitch and rotation mechanism is fixedly installed. The pitch adjustment mechanism is a hydraulic cylinder or an electric push rod, with the drive end acting on the outer wall of the duct 1, enabling the duct 1 to pitch up and down from -25° to 45°, adapting to different work scenarios at different heights, such as material stacking, leveling work, and ditch work. The rotation mechanism is an electric slewing bearing, enabling the duct 1 to rotate horizontally, expanding the horizontal coverage area and meeting the needs of dust suppression throughout the entire area.

[0021] Furthermore, a spraying mechanism 2 is installed inside the square nozzle 101. The spraying mechanism 2 can spray water mist in a direction parallel to the axis of the air duct 1, in a direction away from the axis of the air duct 1, or in a direction close to the axis of the air duct 1, to adapt to the dust suppression needs of different operating scenarios. When the spraying direction of the spraying mechanism 2 changes, in conjunction with the air blown out by the fan inside the air duct 1, the water mist can be carried to a farther area, thereby performing dust suppression operations on the dust-generating area.

[0022] Specifically, the spraying mechanism 2 includes four spray pipes 201, arranged circumferentially around the square nozzle 101 in four directions: top, bottom, left, and right. The two sides of each spray pipe 201 are rotatably connected to the square nozzle 101 via a rotating shaft 202 parallel to its own axis. A torsion spring 203 is fitted around the outside of the rotating shaft 202. The torsion spring 203 constantly applies an elastic force to the spray pipes 201, causing them to rotate towards the axis of the air duct 1. Therefore, when the spray pipes 201 are only subjected to the elastic force of the torsion spring 203, the four spray pipes 201 will rotate and tilt towards the axis of the air duct 1, causing the water mist sprayed from the four spray pipes 201 to converge towards the axis of the air duct 1, thus forming a concentrated water mist, suitable for targeted dust suppression operations in small areas.

[0023] One end of the rotating shaft 202 is rotatably connected to the inner wall of the square nozzle 101 via a damping bearing, and the other end of the rotating shaft 202 is fixedly connected to the spray pipe 201. The damping bearing improves the stability of the rotating shaft 202 and the spray pipe 201 during rotation. One end of the torsion spring 203 is fixedly connected to the inner wall of the square nozzle 101, and the other end of the torsion spring 203 is fixedly connected to the rotating shaft 202. During assembly, the torsion spring 203 needs to be ensured that the water spray direction of the spray pipe 201 is oriented towards the axis of the air duct 1 and is perpendicular to the axis of the air duct 1. At this time, the torsion spring 203 is not twisted and no elastic force is applied to the spray pipe 201 and the rotating shaft 202. When the spray pipe 201 flips in a direction away from the axis of the air duct 1, the torsion spring 203 will be twisted, thus always applying an elastic force to the spray pipe 201 and the rotating shaft 202 in a direction closer to the axis of the air duct 1.

[0024] On the other hand, each of the four spray pipes 201 has a number of nozzles 204 fixedly installed on the side away from the air duct 1. The nozzles 204 located on the same spray pipe 201 are evenly distributed along the length of the corresponding spray pipe 201. The nozzles 204 are atomizing nozzles made of stainless steel, which are wear-resistant and clogging-proof, and can break high-pressure water into fine water mist of 10-150μm.

[0025] In this embodiment, each of the four spray pipes 201 is fixedly connected to a flexible hose 205 communicating with its own inner cavity. A water guide pipe 206 is fixedly sleeved on the outer wall of the air duct 1. The ends of the four flexible hoses 205 away from the spray pipes 201 are connected to the water guide pipe 206 and communicate with the inner cavity of the water guide pipe 206. The outer wall of the water guide pipe 206 has an inlet for connecting to an external water source. The flexible hoses 205 are made of soft material, which can deform when the spray pipes 201 are turned over without affecting the internal water flow. The water guide pipe 206 and the external water source are connected through a water supply pipeline. A high-pressure plunger pump, filter, pressure regulating valve, and other components are installed on the water supply pipeline to ensure a stable water supply.

[0026] Furthermore, a traction rope 3 is fixedly connected to the spray pipe 201, and a drive mechanism 4 is provided on the air duct 1, connected to the end of the traction rope 3 away from the spray pipe 201. The drive mechanism 4 can drive the end of the traction rope 3 away from the spray pipe 201 to move along the axis of the air duct 1 towards or away from the square nozzle 101. Therefore, the drive mechanism 4 enables the traction rope 3 to be subjected to a pulling force, thereby causing the spray pipe 201 to rotate away from the axis of the air duct 1, realizing the adjustment of the spray angle of the spray pipe 201 to adapt to different operating scenarios.

[0027] Specifically, in this embodiment, when the driving mechanism 4 drives the traction rope 3 to move away from the spray pipe 201 from the side near the square nozzle 101 to the side away from the square nozzle 101, the spray direction of the spray pipe 201 can change sequentially from the direction near the axis of the air duct 1, to the direction parallel to the axis of the air duct 1, to the direction away from the axis of the air duct 1, which can be applied to ditch operation, flat ground operation, and material stacking operation scenarios respectively.

[0028] Among them, the traction rope 3 is made of Dyneema ultra-high molecular weight polyethylene material with ultraviolet protection. Its tensile strength is 15 times that of steel wire rope of the same weight. It has no elastic deformation when pulled, can accurately control the flip angle of the spray pipe 201, and has the advantages of water resistance, corrosion resistance and resistance to ultraviolet radiation, and can adapt to the long-term sun exposure environment of the construction site.

[0029] Furthermore, four slide rails 102 are fixedly installed on the outer wall of the air duct 1 along its own axis. The four slide rails 102 are circumferentially distributed and correspond one-to-one with the four traction ropes 3. A slider 301 is fixedly installed at the end of the traction rope 3 away from the spray pipe 201. The slider 301 is slidably mounted on the slide rail 102 along the axis of the air duct 1. The cross-sectional shape of the slide rail 102 is U-shaped. Limiting grooves are opened on the left and right side walls of the inner side of the slide rail 102. Limiting blocks are opened on the left and right side walls of the slide rail 102 and embedded in the limiting grooves. The limiting blocks can move along the axis of the air duct 1 within the limiting grooves, but cannot move vertically, so that the slider 301 cannot separate from the slide rail 102 when sliding, thereby improving the stability of the slider 301 when sliding.

[0030] It should be noted that the drive mechanism 4 includes four electromagnets 401, which are slidably mounted on the slide rail 102 along the axial direction of the air duct 1 and correspond one-to-one with four sliders 301. When the electromagnets 401 are energized, they attract each other and the sliders 301 move synchronously. When the electromagnets 401 are de-energized, the sliders 301 move towards the square nozzle 101 under the action of the torsion spring 203.

[0031] The electromagnet 401 is located on the side of the slider 301 away from the square nozzle 101. The slider 301 is made of iron or other metal materials that can be attracted by magnets. When the electromagnet 401 is energized, the magnetic attraction force it generates on the slider 301 is greater than the sum of the weight of the spray pipe 201 itself and the elastic force generated by the torsion spring 203 on the spray pipe 201. This allows the electromagnet 401 to drive the slider 301 to move synchronously when energized, without separating from the slider 301, thereby causing the spray pipe 201 to flip and change the spray angle.

[0032] Furthermore, four electromagnets 401 are connected to a drive ring 402 on the side opposite to the air duct 1. The drive ring 402 is slidably sleeved on the outside of the air duct 1 along its axial direction. The drive mechanism 4 also includes a cylinder 403 fixedly mounted on the air duct 1 and used to control the movement of the drive ring 402 along its axial direction. The drive ring 402 and the electromagnets 401 are fixedly connected so that the drive ring 402 will not rotate outside the air duct 1, but can only move axially. A mounting bracket is fixedly connected to the outside of the air duct 1, and the cylinders 403 are fixedly mounted on the mounting bracket and distributed along the axial direction of the air duct 1. The movable end of the cylinder 403 is fixedly connected to the side wall of the drive ring 402 to drive the drive ring 402 to move axially along the air duct 1. Moreover, there are at least two cylinders 403, symmetrically distributed on the outside of the air duct 1, acting on two symmetrically distributed areas on the drive ring 402, so that the drive ring 402 is subjected to uniform force when moving, and avoids the drive ring 402 tilting and causing jamming.

[0033] It should be noted that the power supply method of the electromagnet 401 can be designed according to actual needs. For example, there is a wire connected to the electromagnet 401 inside the drive ring 402. The other end of the wire extends out of the drive ring 402, and a soft protective sleeve is put on the outside of the wire for waterproofing and wear prevention. The end of the wire extending out of the drive ring 402 can extend to the base of the fog cannon. A power supply and a control module for controlling the power on and off of different electromagnets 401 are installed on the base.

[0034] A high-precision tilt sensor is fixedly installed on the outer wall of the ventilation duct 1 to detect the pitch angle of the ventilation duct 1, serving as the trigger signal for the electromagnet 401 to be energized or de-energized. Four travel limit switches, each corresponding to one of the four spray pipes 201, are also installed on the inner wall of the square nozzle 101 to detect the flipping state of the spray pipes 201 and provide feedback to the control module to prevent excessive flipping from affecting the dust suppression effect. Furthermore, it can directly share a control system with the pitch adjustment mechanism of the ventilation duct 1, allowing manual control signals to be sent to control the movement distance of the drive ring 402 and the energization / de-energization state of the electromagnet 401. This enables workers to adjust the spray direction of the spray pipes 201 to the optimal angle according to different dust suppression needs and work scenarios, thereby improving the dust suppression effect.

[0035] Furthermore, such as Figure 3 and Figure 7 As shown, the two spray pipes 201 located above and below the square nozzle 101 are on the same vertical plane, and the two spray pipes 201 located to the left and right of the square nozzle 101 are also on the same vertical plane. The two vertical planes are parallel to each other, and a clearance is reserved between the vertically extending shaft 202 and the horizontally extending shaft 202 to ensure that the flipping action of the upper and lower spray pipes 201 and the left and right spray pipes 201 does not interfere with each other. Through the clearance, different shafts 202 can be connected to different areas within the square nozzle 101, avoiding mutual interference when the torsion spring 203 is twisted. At the same time, the flipping process of the spray pipes 201 in different positions will not be obstructed, preventing different spray pipes 201 from colliding and affecting the flipping process, thus avoiding damage to the spray pipes 201.

[0036] It is worth mentioning that, such as Figure 3 As shown, the square nozzle 101 has notches on all four sides, and the length of the notches is not less than the length of the spray pipe 201. This ensures that when the spray pipe 201 is rotated away from the axis of the air duct 1, it will not be obstructed by the opening edge of the square nozzle 101, thus allowing the spray pipe 201 to rotate into a diverging state.

[0037] Specifically, the spraying directions of the spraying mechanism 2 include at least the following four: When the angle between the ventilation duct 1 and the ground is within the first angle range (10°~45°), all four electromagnets 401 are energized, attracting the slider 301. The cylinder 403 drives the drive ring 402 to move away from the square nozzle 101, causing the traction rope 3 to pull the spray pipe 201, making the four spray pipes 201 flip and tilt away from the axis of the ventilation duct 1, thus making the water mist disperse and expanding the water mist coverage area. This is suitable for high-altitude operations such as material stacking.

[0038] When the angle between the air duct 1 and the ground is in the second angle range (-5° to 10°), the four electromagnets 401 are still energized, attracting the slider 301. The cylinder 403 drives the drive ring 402 to move towards the square nozzle 101 until the four spray pipes 201 are flipped to a direction parallel to the axis of the air duct 1 under the action of the torsion spring 203, so that the water mist spray direction is parallel to the air blowing direction of the air duct 1, allowing the water mist to be blown to a farther area. In conjunction with the pitch and rotation adjustment mechanism of the air duct 1, the air duct 1 swings in the horizontal direction, so that the water mist can cover the entire area of ​​the flat ground operation, which is suitable for flat ground operation scenarios.

[0039] When the angle between the ventilation duct 1 and the ground is in the third angle range (-15° to -5°), the four electromagnets 401 are still energized, attracting the slider 301. The cylinder 403 drives the drive ring 402 to move towards the square nozzle 101 until the four spray pipes 201 are flipped to face the inner side closer to the axis of the ventilation duct 1 under the action of the torsion spring 203. The water mist sprayed from the four spray pipes 201 gathers towards the axis of the ventilation duct 1, forming a convergence pattern, allowing more water mist to be sprayed onto the dusty area. This is suitable for targeted dust suppression scenarios during ditch operations and can perform targeted water mist spraying operations at the work site.

[0040] When the angle between the ventilation duct 1 and the ground is within the fourth angle range (-25° to -15°), the electromagnets 401 at the left and right positions on the ventilation duct 1 are de-energized. The spray pipes 201 at the left and right positions on the square nozzle 101 spray water mist towards the inner side closer to the axis of the ventilation duct 1 under the action of the torsion spring 203. Meanwhile, the electromagnet 401 at the bottom of the ventilation duct 1 is energized, and the spray pipe 201 at the bottom of the square nozzle 101 sprays water mist towards the outer side farther from the axis of the ventilation duct 1 under the drive mechanism 4. During ditch operations, the fog cannon is located on the ground and can only spray water mist into the ditch by tilting the ventilation duct 1 downwards. However, due to the limited pitch angle of the ventilation duct 1, the area at the bottom of the ditch near the ventilation duct 1 cannot be swept by the outlet of the ventilation duct 1. This results in the spray range of the spray pipe 201 not covering this area, creating a dust suppression blind spot. However, in this application, by de-energizing the electromagnet 401, the spray pipes 201 in the upper, left, and right directions can be rotated towards the inner side closer to the axis of the air duct 1 under the action of the torsion spring 203, maintaining a flow concentration state and performing targeted dust suppression at the work point. Meanwhile, the lower spray pipe 201, under the attraction of the electromagnet 401 and the movement of the drive ring 402 away from the square nozzle 101, continuously rotates towards the outer side away from the axis of the air duct 1, thereby allowing the lower spray pipe 201 to rotate downward at a larger angle, thus enabling the lower spray pipe 201 to spray water on the dust suppression blind area. Through the reciprocating movement of the drive ring 402, the spray pipe 201 can spray water on the blind area comprehensively, improving the dust suppression effect during ditch operations.

[0041] It should be noted that the above-mentioned spray directions are not only applicable to the corresponding scenarios. In addition, in the same work scenario, the staff can also change the spray direction of different spray pipes 201 according to their needs. For example, when working at heights, a convergent spray pattern can be used, and when working in ditches, a divergent spray pattern can be used, which greatly improves the applicability of the equipment to different scenarios and needs.

[0042] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0043] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A dust control device for construction sites based on green construction, comprising a fog cannon, wherein the fog cannon includes a ventilation duct, characterized in that: A square nozzle is fixedly installed at the air outlet of the air duct. A spraying mechanism is installed inside the square nozzle. The spraying mechanism can spray water mist in a direction parallel to the axis of the air duct, or in a direction away from the axis of the air duct, or in a direction close to the axis of the air duct, so as to adapt to the dust suppression needs of different working scenarios. The spraying mechanism includes four spray pipes, which are distributed in a circular pattern around the square nozzle. The two sides of each spray pipe are rotatably connected to the square nozzle via a rotating shaft parallel to its own axis. A torsion spring is sleeved on the outside of the rotating shaft. The torsion spring always applies an elastic force to the spray pipe, causing it to rotate towards the direction of the air duct axis. A traction rope is fixedly connected to the spray pipe, and a drive mechanism is provided on the air duct to the end of the traction rope away from the spray pipe. The drive mechanism can drive the end of the traction rope away from the spray pipe to move along the axial direction of the air duct towards or away from the square nozzle. When the drive mechanism drives the traction rope away from the spray pipe from the end near the square nozzle to the direction away from the square nozzle, the spray direction of the spray pipe can change sequentially from the direction near the wind tunnel axis, to the direction parallel to the wind tunnel axis, and to the direction away from the wind tunnel axis. Each of the four spray pipes is fixed with several nozzles on the side away from the air duct, and the nozzles on the same spray pipe are evenly distributed along the length of the corresponding spray pipe. The outer wall of the air duct is fixedly provided with four slide rails along its own axis. The four slide rails are distributed in a circle and are set one-to-one with four traction ropes. The end of the traction rope away from the spray pipe is fixedly provided with a slider, and the slider is slidably set on the slide rail along the axis of the air duct. The driving mechanism includes four electromagnets, which are slidably mounted on a slide rail along the axial direction of the air duct and correspond one-to-one with the four sliders. When the electromagnets are energized, they attract each other and the sliders move synchronously. When the electromagnets are de-energized, the sliders move towards the square nozzle under the action of a torsion spring. The four electromagnets are connected to a drive ring on the side away from the air duct. The drive ring is slidably sleeved on the outside of the air duct along the axial direction of the air duct. The drive mechanism also includes a cylinder fixedly mounted on the air duct and used to control the drive ring to move along the axial direction of the air duct. The spraying direction of the spraying mechanism includes at least the following four: When the angle between the air duct and the ground is within the first angle range, the four spray pipes spray water mist in a direction away from the axis of the air duct. When the angle between the air duct and the ground is within the second angle range, the four spray pipes spray water mist in a direction parallel to the axis of the air duct. When the angle between the air duct and the ground is in the third angle range, the four spray pipes spray water mist in the direction close to the inner side of the air duct axis. When the angle between the air duct and the ground is in the fourth angle range, the electromagnets in the left and right positions of the air duct are de-energized, and the spray pipes in the left and right positions of the square nozzle spray water mist in the direction close to the axis of the air duct under the action of the torsion spring. The electromagnet at the bottom of the air duct is energized, and the spray pipe at the bottom of the square nozzle sprays water mist in the direction away from the axis of the air duct under the drive of the drive mechanism. A power supply and a control module for controlling the power on and off of different electromagnets are installed on the base. A high-precision tilt sensor is fixedly installed on the outer wall of the duct to detect the pitch angle of the duct, which serves as the trigger signal for the electromagnet to be energized or de-energized.

2. A dust control device for construction sites based on green construction according to claim 1, characterized in that: The two spray pipes located above and below the square nozzle are on the same vertical plane, and the two spray pipes located to the left and right of the square nozzle are on the same vertical plane. The two vertical planes are parallel to each other, and a clearance is reserved between the rotating shaft extending in the vertical direction and the rotating shaft extending in the horizontal direction to ensure that the flipping action of the spray pipes located above and below and the spray pipes located to the left and right does not interfere with each other.

3. A dust control device for construction sites based on green construction, as described in claim 2, characterized in that: One end of the rotating shaft is rotatably connected to the inner wall of the square nozzle via a damping bearing, and the other end of the rotating shaft is fixedly connected to the spray pipe. One end of the torsion spring is fixedly connected to the inner wall of the square nozzle, and the other end of the torsion spring is fixedly connected to the rotating shaft.

4. A dust control device for construction sites based on green construction, as described in claim 3, characterized in that: The square nozzle has notches on all four sides (top, bottom, left, and right), and the length of each notch is not less than the length of the spray tube.

5. A dust control device for construction sites based on green construction, as described in claim 4, characterized in that: Each of the four spray pipes is fixedly connected to a flexible hose that communicates with its own inner cavity. A water guide pipe is fixedly sleeved on the outer wall of the air duct. The ends of the four flexible hoses away from the spray pipes are connected to the water guide pipe and communicate with the inner cavity of the water guide pipe. The outer wall of the water guide pipe has an inlet for connecting to an external water source.

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