Dust removal device for building construction

Abstract

The invention provides a dust removal device for building construction, which comprises a spray head, a water supply assembly and an air supply assembly, the air supply assembly is provided with an air outlet end, the air outlet end is inserted into an air inlet and forms an air suction gap, when the air outlet end supplies air to the spray head, the spray head sucks external air through the air suction gap, and the air supply assembly supplies air to the spray head. The air supply amount of the air outlet end is reduced while the coverage range of water mist sprayed by the spray head is guaranteed, and the device adapts to the working condition that the dust content in air is large; a separating part is arranged in the spray head and close to the air inlet, a collecting part is arranged in the spray head and close to the water spray nozzle, and dust particles are separated from sucked external air through the separating part and collected through the collecting part, so that efficient dust removal is conducted on the sucked external air, and the phenomenon that the spray head is blocked is avoided.

Description

Technical Field

[0001] The present invention relates to a construction device, in particular to a dust removal device for construction. Background Art

[0002] With the continuous advancement of urbanization and the rapid development of the construction industry, the number of various new construction, renovation, and demolition projects has increased significantly. During the construction process, a large amount of dust pollutants are generated in operation links such as earth excavation, building material cutting, concrete mixing, and wall demolition. These dusts not only contain components such as particulate matter (PM10, PM2.5), cement ash, and sand debris, but may also be mixed with harmful chemical substances, causing continuous pollution to the construction site and the surrounding environment. Moreover, in open or semi-closed construction sites, dust is easily affected by air flow diffusion, forming large-scale dust pollution, thereby reducing air visibility, threatening the normal operation safety of construction machinery, and also causing long-term harm to the respiratory health of operators. Therefore, construction parties need to adopt efficient and sustainable treatment measures to reduce the impact of construction activities on the ecological environment and public health.

[0003] Currently, a dust removal device specifically used in the construction field that is gradually widely used sprays water mist through a nozzle to perform dust reduction treatment on the construction area. However, when the dust content in the air is relatively large, to increase the coverage range of the water mist sprayed by the nozzle, more air supply and water supply are required, resulting in an increase in resource consumption, and the nozzle is prone to blockage when inhaling dust-containing gas.

[0004] The information disclosed in the background art part of the present invention is only intended to deepen the understanding of the general background art of the present invention, and should not be regarded as an admission or any form of implication that this information constitutes the prior art known to those skilled in the art. Summary of the Invention

[0005] Based on this, it is necessary to provide a dust removal device for construction in view of the problems existing in the current construction dust removal device.

[0006] The above object is achieved by the following technical solutions: A dust removal device for construction includes a nozzle, a water supply assembly, and an air supply assembly. Opposite water spray nozzles and air inlets are provided on the nozzle. The water supply assembly has a water outlet end communicated with the water spray nozzles. The air supply assembly has an air outlet end. The air outlet end is inserted into the air inlet and forms an air suction gap. When the air outlet end supplies air to the nozzle, the nozzle inhales external air through the air suction gap; A separation member is provided in the nozzle near the air inlet, and a collection member is provided near the water spray nozzles. Dust particles are separated from the inhaled external air through the separation member and collected through the collection member.

[0007] In one embodiment, the separating member includes a plurality of blades circumferentially spaced apart, and the blades are arranged at an angle with respect to their rotation plane. After passing through the blades, the inhaled external air rotates.

[0008] In one embodiment, the air outlet end faces the blades to generate a rotational force and a driving force on the blades. An obstructing member is provided in the nozzle head, and the obstructing member generates a rotational resistance on the blades, and the rotational resistance is positively correlated with the driving force.

[0009] In one embodiment, the separating member further includes a central disk, and a driving member is provided on the central disk. The driving member is used to adjust the angle between the blades and their rotation plane.

[0010] In one embodiment, the obstructing member is a first friction plate, a second friction plate is provided on the blade, and an elastic member is provided in the nozzle head. The elastic force of the elastic member causes the first friction plate to abut against the second friction plate.

[0011] In one embodiment, a conductor disk is provided on the blade, the obstructing member is an electromagnet, and the electromagnet is close to the circumferential surface of the conductor disk.

[0012] In one embodiment, a rod body is provided in the nozzle head. The first friction plate, the blade, and the second friction plate are all slidably arranged on the rod body, and the blade and the second friction plate can rotate.

[0013] In one embodiment, the water supply assembly has a water delivery pipe, the air supply assembly has an air delivery pipe, and a plurality of the nozzles are arranged at intervals along a preset direction. The water flow direction in the water delivery pipe is opposite to the air flow direction in the air delivery pipe.

[0014] In one embodiment, a filter screen is provided in the air inlet of the nozzle head.

[0015] In one embodiment, a plurality of water spray nozzles are arranged at intervals along the circumference of the nozzle head. A water equalizing ring communicating with the plurality of water spray nozzles is provided on the nozzle head, and the water outlet end communicates with the water equalizing ring.

[0016] The beneficial effects of the present invention are as follows: When the air outlet end supplies air to the nozzle head, the nozzle head inhales external air through the air suction gap, reduces the air supply volume of the air outlet end while ensuring the coverage range of the water mist sprayed by the nozzle head, and is suitable for working conditions with a large dust content in the air. The separating member first separates dust particles from the inhaled external air and collects them through the collecting member to efficiently remove dust from the inhaled external air and avoid clogging of the nozzle head. Description of the Drawings

[0017] Figure 1 Schematic diagram of the overall structure of the dust removal device for building construction provided by the embodiment of the present invention; Figure 2 For Figure 1 Partial cross-sectional view of the dust removal device for building construction in; Figure 3 For Figure 2 Partial enlarged view at A in; Figure 4 For Figure 2 Front view of the dust removal device for building construction in; Figure 5 For Figure 4 Cross-sectional view in the B-B direction of the dust removal device for building construction in; Figure 6 For Figure 5 Diagram of the change in the motion state of the dust removal device for building construction in; Figure 7 For Figure 5 Partial enlarged view at C in; Figure 8 For Figure 6 Partial enlarged view at D in; Figure 9 For Figure 7 Structure deformation diagram of the dust removal device for building construction in;

[0018] Wherein: 100, spray head; 101, water spray nozzle; 102, air inlet; 103, air suction gap; 104, water pump; 105, air pump; 106, mounting frame; 107, filter screen; 108, water equalizing ring; 110, separating member; 111, collecting member; 112, blade; 113, blocking member; 114, central disk; 115, first friction plate; 116, second friction plate; 117, elastic member; 118, conductor disk; 119, electromagnet; 120, rod body; 121, fixed rod; 122, baffle; 200, water supply assembly; 201, water outlet end; 202, water delivery pipe; 300, air supply assembly; 301, air outlet end; 302, air delivery pipe. Specific embodiments

[0019] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0020] The serial numbers assigned to components in this document itself, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meaning. And the "connection" and "coupling" mentioned in this invention, unless otherwise specifically stated, both include direct and indirect connection (coupling). In the description of this invention, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation on this invention.

[0021] In this invention, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0022] As Figures 1 to 9 shown, an embodiment of the present invention provides a dust removal device for building construction, which includes a spray head 100, a water supply component 200 and a gas supply component 300. The spray head 100 is relatively provided with a water spray nozzle 101 and an air inlet 102. The water supply component 200 has a water outlet end 201 communicated with the water spray nozzle 101. The gas supply component 300 has a gas outlet end 301. The gas outlet end 301 is inserted into the air inlet 102 and forms a suction gap 103. When the gas outlet end 301 supplies gas to the spray head 100, the spray head 100 inhales external air through the suction gap 103; A separation member 110 is provided in the spray head 100 near the air inlet 102, and a collection member 111 is provided near the water spray nozzle 101. Dust particles are separated from the inhaled external air through the separation member 110 and collected through the collection member 111.

[0023] When the gas outlet end 301 supplies gas to the spray head 100, the spray head 100 inhales external air through the suction gap 103, while ensuring the coverage range of the water mist sprayed by the spray head 100 and reducing the gas supply volume of the gas outlet end 301, adapting to the working condition with a large dust content in the air. First, the dust particles are separated from the inhaled external air through the separation member 110, and then collected through the collection member 111 to efficiently remove dust from the inhaled external air and avoid the blockage phenomenon of the spray head 100.

[0024] Among them, the air outlet end 301 has a trumpet-shaped outlet, so that the blown air has a certain diffusivity. The blown air has a certain pressure and flow rate, and generates a low pressure near the air suction gap 103, so that external air is sucked in under the action of atmospheric pressure.

[0025] Among them, referring to Figure 5 , Figure 6 , the nozzle 100 can be assembled by two parts. One is used to set the separation member 110, and the other is used to set the collection member 111. For the part provided with the collection member 111, its inner diameter gradually decreases from far to near the water spray nozzle 101, so as to increase the flow rate of the air ejected from the nozzle 100 and improve the spraying effect. In addition, the collection member 111 can be made of electrostatic materials such as polypropylene and polyester fiber, and adsorb charged dust particles through permanent electrostatic charges; or, the inner surface of the collection member 111 can be coated with a viscous material such as silica gel, resin or polymer gel, which has the ability to efficiently capture dust particles; of course, the collection member 111 can also be other materials or structures that can adsorb and collect dust particles, which are not limited here.

[0026] Preferably, referring to Figure 3 , the separation member 110 includes a plurality of blades 112 arranged at circumferential intervals. The blades 112 are arranged at an angle with their rotation plane. After passing through the blades 112, the inhaled external air rotates.

[0027] Since the blades 112 are arranged at an angle with their rotation plane, the inhaled external air flows along the inclined blades 112, and thus rotates after passing through the blades 112 to generate a centrifugal force, so as to throw out the dust particles and separate them from the inhaled external air.

[0028] Among them, the blown air is mixed with the inhaled external air, and passes through the blades 112 with basically the same path, pressure and flow rate. Therefore, the dust particles are actually separated from the mixed air of the blown and inhaled air. However, for the convenience of description, the following is referred to as the dust particles being separated from the inhaled external air.

[0029] Of course, other methods that can separate the dust particles from the inhaled external air can also be used, such as electrostatic precipitation, in which the dust particles are charged by a high-voltage electric field, and the charged particles migrate and deposit on the collection member 111 under the action of the electric field force.

[0030] Preferably, the air outlet end 301 faces the blades 112 to generate a rotational force and a driving force on the blades 112. A blocking member 113 is provided in the nozzle 100, and the blocking member 113 generates a rotational resistance on the blades 112, and the rotational resistance is positively correlated with the driving force.

[0031] When the dust content in the air increases, the flow rate, pressure or flow rate of the blown-in air is controlled to increase. Both the rotational force and the driving force exerted by the blown-in air on the blade 112 increase. The rotational resistance generated by the obstacle 113 that the blade 112 encounters increases, and the rotational speed of the blade 112 decreases, causing the centrifugal force generated by the rotation of the inhaled external air to increase, thereby improving the dust removal effect on the inhaled external air.

[0032] Among them, the force exerted by the air blown into the air outlet end 301 on the blade 112 can be divided into a rotational force and a driving force that are perpendicular to each other. Among them, the rotational force is the tangential force received by the blade 112 to cause the blade 112 to have a rotational effect, so as to reduce the resistance to the incoming air, thereby reducing the flow rate consumption of the incoming air when flowing in the nozzle 100; the driving force is the axial force received by the blade 112 to cause the blade 112 to have a tendency to move away from the air outlet end 301. The rotational resistance is the force that restricts the rotation of the blade 112, which can be frictional force, magnetic force, an additionally applied reverse torque, or the resistance generated by the transmission system, etc.

[0033] As a structural deformation of the present invention, the separating member 110 further includes a central disk 114. A driving member (not shown) is provided on the central disk 114, and the driving member is used to adjust the angle between the blade 112 and the rotation plane of the blade 112.

[0034] Among them, the driving member can be a motor and a plurality of motors are arranged at intervals along the circumference of the central disk 114. The motors are configured with corresponding batteries and controllers to facilitate controlling the start-stop and rotation angle of their output ends. The output end of the motor is arranged radially along the central disk 114 and is fixedly corresponding to the blade 112. The output end of the motor can drive the blade 112 to rotate to adjust the angle between the blade 112 and its rotation plane, so as to change the centrifugal force generated by the rotation of the inhaled external air and adjust the dust removal effect on the inhaled external air.

[0035] Specifically, the blade 112 forms two angles with its rotation plane whose sum is 180°. The smaller the absolute value of the difference between the two angles, the greater the centrifugal force generated by the rotation of the inhaled external air, the better the dust removal effect, and at the same time, the smaller the resistance to air flow. The value range of each angle is (0°, 90°), such as 30°, 40°, 45°, 60°, etc. For example, compared with the two angles of 45° and 135° respectively, when the two angles are 60° and 120° respectively, the centrifugal force generated by the rotation of the blade 112 on the inhaled external air is greater and the resistance to air flow is also smaller.

[0036] Preferably, the obstacle 113 is a first friction plate 115, a second friction plate 116 is provided on the blade 112, and an elastic member 117 is provided in the nozzle 100. The elastic force of the elastic member 117 causes the first friction plate 115 to abut against the second friction plate 116.

[0037] When the dust content increases and the flow rate and pressure of the blown air are correspondingly increased, both the rotational force and the driving force generated by the air blown into the air outlet end 301 on the blade 112 increase. The increase in the driving force causes the second friction plate 116 on the blade 112 to tend to move towards the first friction plate 115, making the second friction plate 116 abut more closely against the first friction plate 115, and the frictional force therebetween, that is, the rotational resistance, also increases correspondingly. As a result, the rotational speed of the blade 112 decreases, and the centrifugal force generated by the rotation of the inhaled external air increases, thereby improving the dust removal effect on the inhaled external air.

[0038] Among them, the elastic member 117 is preferably a spring. When the elastic member 117 is arranged on the side of the blade 112 away from the air outlet end 301, the elastic member 117 is a compression spring. When the elastic member 117 is arranged on the side of the blade 112 close to the air outlet end 301, the elastic member 117 is a tension spring. The surfaces of the first friction plate 115 and the second friction plate 116 that face each other are friction surfaces, and anti-slip lines can be provided on the friction surfaces or they can be made of a material with a large friction coefficient.

[0039] As a structural deformation of the present invention, refer to Figure 9 , a conductor disc 118 is provided on the blade 112, and the blocking member 113 is an electromagnet 119, and the electromagnet 119 is close to the circumferential surface of the conductor disc 118.

[0040] Among them, the electromagnet 119 is configured with a corresponding power supply and control module to control the generation of the magnetic field. A plurality of electromagnets 119 are arranged at intervals along the circumference of the conductor disc 118 to provide a more stable and stronger magnetic induction intensity. When the blade 112 drives the conductor disc 118 to rotate, the conductor disc 118 continuously cuts the static magnetic field of the electromagnet 119. According to Faraday's law of electromagnetic induction, an annular current, that is, an eddy current, will be induced in the conductor disc 118. According to Lenz's law, a magnetic field opposite to the direction of the static magnetic field will be generated in the conductor disc 118, and the reverse magnetic field interacts with the static magnetic field to generate a resistance torque opposite to the rotation direction of the conductor disc 118, that is, a braking torque. At the same time, the eddy current generates Joule heat due to the resistance in the conductor, converting the kinetic energy of the conductor disc 118 into heat energy to achieve deceleration.

[0041] Braking torque , B is the magnetic induction intensity, ω is the angular velocity, and r is the radius of the disc. That is to say, the braking torque T has a positive correlation with the magnetic induction intensity B. A magnetic field regulating device can be set to change the magnetic induction intensity B of the static magnetic field generated by the electromagnet 119, so as to have a positive correlation with the flow velocity and pressure of the blown air. For example, a flow velocity sensor, a pressure sensor, or a flow sensor is arranged in the air outlet end 301 to obtain the flow velocity, pressure, or flow signal of the blown air and send it to the processor. The processor adjusts the energizing current of the electromagnet 119 to change the magnetic induction intensity B of the static magnetic field generated by it, so as to achieve: when the dust content increases and the flow velocity and pressure of the blown air are correspondingly increased, the magnetic induction intensity B is correspondingly increased, thereby increasing the braking torque T, so that the rotational resistance received by the blade 112 increases and the rotational speed decreases, and the centrifugal force generated by the rotation of the inhaled external air increases. The specific circuit and structural design related to the electromagnet 119 are prior art and will not be elaborated here.

[0042] Preferably, a rod body 120 is arranged in the nozzle 100. The first friction plate 115, the blade 112, and the second friction plate 116 are all slidably arranged on the rod body 120, and the blade 112 and the second friction plate 116 can rotate.

[0043] When the driving force generated by the air outlet end 301 on the blade 112 is greater than the elastic force generated by the elastic member 117 on the first friction plate 115, the blade 112, the second friction plate 116, and the first friction plate 115 move synchronously, and the greater the moving amount of the blade 112, the greater the corresponding rotational resistance.

[0044] Wherein, one end of the rod body 120 is provided with a fixing rod 121, the fixing rod 121 is fixed in the nozzle 100, the other end of the rod body 120 is provided with a baffle 122, the baffle 122 is fixed to one end of the elastic member 117, and the other end of the elastic member 117 is fixed to the first friction plate 115. The cross-section of the rod body 120 is circular, and the first friction plate 115 is slidably sleeved on the rod body 120 through a first through hole opened at its center, and the rod body 120 and the first through hole are slidably connected through a key and a keyway. A plurality of blades 112 are arranged on the circumferential surface of the central disc 114. A second through hole is opened at the center of the central disc 114, and the outer ring of a bearing is fixed in the second through hole, and the inner ring of the bearing is slidably sleeved on the rod body 120. Of course, the inner ring of the bearing can be made of a smooth material to reduce the sliding friction between it and the rod body 120.

[0045] Of course, the elastic member 117 may not be provided, or the elastic force of the elastic member 117 may be infinitely large. That is, the blade 112 and the second friction plate 116 can rotate and move along the rod body 120, while the first friction plate 115 does not move along the rod body 120. The blown air causes the second friction plate 116 to always abut against the first friction plate 115. When the flow rate, pressure or flow rate of the blown air increases, the second friction plate 116 abuts more closely against the first friction plate 115, and the frictional force therebetween, i.e., the rotational resistance, also increases correspondingly, so that the rotational speed of the blade 112 decreases, and the centrifugal force generated by the rotation of the inhaled external air increases, thereby improving the dust removal effect on the inhaled external air.

[0046] Preferably, referring to Figure 1 , Figure 2 , Figure 4 , the water supply assembly 200 has a water delivery pipe 202, the air supply assembly 300 has an air delivery pipe 302, and a plurality of nozzles 100 are arranged at intervals along a preset direction. The water flow direction in the water delivery pipe 202 is opposite to the air flow direction in the air delivery pipe 302.

[0047] When the water delivery pipe 202 or the air delivery pipe 302 is relatively long, the nozzles 100 farther from the water pump 104 and the air pump 105 will generate a pressure drop, resulting in a decrease in the pressure of the nozzles 100 and affecting the spray coverage range. By setting the water flow direction in the water delivery pipe 202 to be opposite to the air flow direction in the air delivery pipe 302, the problem of the end pressure drop caused by the excessive length of the water delivery pipe 202 or the air delivery pipe 302 is reduced, so that the water mist sprayed by each nozzle 100 is basically in a uniform state throughout the process.

[0048] Among them, the water delivery pipe 202 and the air delivery pipe 302 are preferably arranged in parallel and can be connected by pipe fixing members. The water pump 104 is arranged at the first end of the water delivery pipe 202 or the air delivery pipe 302, and its output end is communicated with the first end of the water delivery pipe 202. The air pump 105 is arranged at the second end of the water delivery pipe 202 or the air delivery pipe 302, and its output end is communicated with the second end of the air delivery pipe 302. The water pump 104 and the air pump 105 are configured with corresponding water sources or air sources, as well as power supplies and controllers, so as to facilitate continuous water supply or air supply. Of course, there may also be a certain angle between the water delivery pipe 202 and the air delivery pipe 302. The preset direction may be the length direction of the water delivery pipe 202 or the air delivery pipe 302, or other directions convenient for arranging a plurality of nozzles 100 at intervals. The nozzles 100 are installed on the water delivery pipe 202 or the air delivery pipe 302 or other arrangement devices through the mounting brackets 106. An adjusting device may also be provided on the mounting brackets 106 to change the spraying orientation angle or spraying height of the nozzles 100.

[0049] Of course, a plurality of water pumps 104 and air pumps 105 may also be arranged at intervals along the preset direction, so that the water mist sprayed by each nozzle 100 tends to be uniform.

[0050] Preferably, referring toFigure 2 Inside the air inlet 102 of the nozzle 100, a filter screen 107 is provided to preliminarily filter the inhaled external air. Of course, the filter screen 107 also serves to separate the nozzle 100 from the external space.

[0051] Preferably, referring to Figure 2 、 Figure 4 、 Figure 5 A plurality of water spray nozzles 101 are arranged at intervals along the circumferential direction of the nozzle 100. A water equalizing ring 108 communicating with the plurality of water spray nozzles 101 is provided on the nozzle 100. The water outlet end 201 communicates with the water equalizing ring 108, so that the water spray nozzles 101 can spray water in a ring shape, forming a more uniform and larger-range spray, improving the spray effect.

[0052] In the present invention, by setting the water flow direction in the water delivery pipe 202 to be opposite to the air flow direction in the air delivery pipe 302, the problem of end pressure drop caused by the excessive length of the water delivery pipe 202 or the air delivery pipe 302 is reduced, so that the water mist sprayed by each nozzle 100 is basically in a uniform state throughout the process.

[0053] During spraying, air is blown into the nozzle 100 through the air outlet end 301, generating a low pressure near the air suction gap 103 and sucking in external air. While ensuring the coverage range of the water mist sprayed by the nozzle 100, the air supply volume of the air outlet end 301 is reduced, which is suitable for working conditions with a large dust content in the air. The dust particles are first separated from the inhaled external air by the separating member 110. Specifically, the inhaled external air flows along the inclined blades 112 to rotate to generate a centrifugal force, so as to throw out the dust particles and separate them from the inhaled external air, and then collected by the collecting member 111 to efficiently remove dust from the inhaled external air and prevent the nozzle 100 from being blocked.

[0054] When the dust content in the air increases, the flow rate, pressure or flow rate of the blown-in air is controlled to increase. The rotational force and driving force applied by the blown-in air on the blades 112 both increase, and the rotational resistance generated by the blocking member 113 acting on the blades 112 increases, that is, the frictional force between the first friction plate 115 and the second friction plate 116 increases, causing the rotational speed of the blades 112 to decrease, and the centrifugal force generated by the rotation of the inhaled external air to increase, thereby improving the dust removal effect on the inhaled external air.

[0055] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combinations of these technical features do not conflict, they should all be considered as the scope described in this specification.

[0056] The above-described embodiments merely represent several implementation manners of the present invention. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the appended claims.

Claims

1. A dust removal device for construction, characterized in that: The invention comprises a nozzle, a water supply component and an air supply component, wherein a water nozzle and an air inlet are arranged on the nozzle in opposite relation, the water supply component has a water outlet end connected with the water nozzle, the air supply component has an air outlet end, the air outlet end is inserted into the air inlet and an air suction gap is formed, and when the air outlet end supplies air to the nozzle, the nozzle inhales external air through the air suction gap; A separation piece is provided in the nozzle near the air inlet, and a collection piece is provided near the water spray nozzle. Dust particles are separated from the inhaled external air by the separation piece and are collected by the collection piece.

2. The dust removal device for construction according to claim 1, characterized in that: The separator comprises a plurality of blades arranged at intervals in the circumferential direction, wherein the blades are arranged at an angle to the rotation plane thereof, and the inhaled external air rotates after passing through the blades.

3. The dust removal device for construction according to claim 2, characterized in that: The air outlet is directed toward the blades to generate rotational force and driving force on the blades. An obstruction member is provided in the nozzle. The obstruction member generates rotational resistance on the blades. The rotational resistance is positively correlated with the driving force.

4. The dust removal device for construction according to claim 2, characterized in that: The separation member further comprises a central disk, on which a driving member is arranged, and the driving member is used to adjust the angle between the blade and the rotation plane of the blade.

5. The dust removal device for construction according to claim 3, characterized in that: The obstruction member is a first friction plate, a second friction plate is arranged on the blade, and an elastic member is arranged in the nozzle, and the elastic force of the elastic member causes the first friction plate to abut against the second friction plate.

6. The dust removal device for construction according to claim 3, characterized in that: The blade is provided with a conductor disk, and the blocking member is an electromagnet, which is close to the circumferential surface of the conductor disk.

7. The dust removal device for construction according to claim 5, characterized in that: A rod body is arranged inside the spray head, the first friction plate, the blade and the second friction plate are all slidably arranged on the rod body, and the blade and the second friction plate are capable of rotating.

8. The dust removal device for construction according to claim 1, characterized in that: The water supply component has a water pipe, the air supply component has an air pipe, the plurality of nozzles are arranged at intervals along a preset direction, and the water flow direction in the water pipe is opposite to the air flow direction in the air pipe.

9. The dust removal device for construction according to claim 1, characterized in that: A filter screen is arranged in the air inlet of the nozzle.

10. The dust removal device for construction according to claim 1, characterized in that: A plurality of the water spray nozzles are arranged at intervals along the circumference of the nozzle, and a water balancing ring connected to the plurality of the water spray nozzles is provided on the nozzle, and the water outlet is connected to the water balancing ring.

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