CN120079192A

CN120079192A - Dust collector for construction

Info

Publication number: CN120079192A
Application number: CN202510559189.6A
Authority: CN
Inventors: 周洲; 王嘉昌; 汤婷; 李明阳; 武增杰; 王备备; 梁刚; 邢长利; 沈亚辉; 史润琛; 宋书波
Original assignee: Dezhou Shuangxin Construction Engineering Co ltd
Current assignee: Dezhou Shuangxin Construction Engineering Co ltd
Priority date: 2025-04-30
Filing date: 2025-04-30
Publication date: 2025-06-03
Anticipated expiration: 2045-04-30
Also published as: CN120079192B

Abstract

The present invention provides a dust removal device for construction, comprising a nozzle, a water supply component and an air supply component, wherein 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, when the air outlet end supplies air to the nozzle, the nozzle inhales external air through the air suction gap, while ensuring the coverage of the water mist sprayed by the nozzle, the air supply amount of the air outlet end is reduced, and it is suitable for working conditions with a large dust content in the air; a separation component is provided in the nozzle near the air inlet, and a collecting component is provided near the water nozzle, dust particles are separated from the inhaled external air by the separation component, and are collected by the collecting component, so as to efficiently remove dust from the inhaled external air and avoid clogging of the nozzle.

Description

Dust collector for construction

Technical Field

The invention relates to a building construction device, in particular to a dust removing device for building construction.

Background

Along with the continuous promotion of the urban process and the rapid development of the building industry, the number of various new construction, reconstruction and demolition projects is obviously increased. In the construction process of the building, a large amount of dust pollutants can be generated in the working links of earth excavation, building material cutting, concrete stirring, wall dismantling and the like. These dusts contain not only particulate matter (PM 10, PM 2.5), cement ash, sand and stone chips, etc., but also may be mixed with harmful chemical substances, causing persistent pollution to the construction site and the surrounding environment. In an open or semi-closed construction site, dust is easily affected by airflow diffusion to form large-range dust pollution, so that air visibility is reduced, normal operation safety of construction machinery is threatened, and long-term harm to respiratory system health of operators can be generated. Therefore, the construction party needs to adopt a high-efficiency sustainable treatment means to reduce the influence of construction activities on ecological environment and public health.

At present, the special dust collector in the building field is widely used gradually, and spray nozzles spray water mist to carry out dust fall treatment on a construction area, but when the dust content in the air is large, the coverage range of spray nozzles spraying water mist needs to be lifted, more air supply and water supply are needed to be provided, the resource consumption is increased, and the spray nozzles are easy to generate blocking phenomenon when sucking dust-containing gas.

The information disclosed in the background section of the invention is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

Disclosure of Invention

Accordingly, it is necessary to provide a dust collector for construction in order to solve the problems of the conventional dust collectors for buildings.

The above purpose is achieved by the following technical scheme:

The dust removing device for the building construction comprises a spray head, a water supply assembly and an air supply assembly, wherein a water spray nozzle and an air inlet are oppositely arranged on the spray head, the water supply assembly is provided with an outlet end communicated with the water spray nozzle, the air supply assembly is provided with an outlet end, the outlet end is inserted into the air inlet and is provided with an air suction gap, and when the outlet end supplies air to the spray head, the spray head sucks external air through the air suction gap;

The inside of the spray head is provided with a separating piece close to the air inlet, the inside of the spray head is provided with a collecting piece close to the water spray nozzle, dust particles are separated from sucked external air through the separating piece, and the dust particles are collected through the collecting piece.

In one embodiment, the separating member includes a plurality of blades disposed at intervals in a circumferential direction, the blades being disposed at an angle to a rotation plane thereof, and the sucked external air is rotated after passing the blades.

In one embodiment, the air outlet end faces the blade to generate a rotating force and an pushing force on the blade, and an obstruction member is arranged in the spray head and generates a rotating resistance to the blade, and the rotating resistance is positively related to the pushing force.

In one embodiment, the separating member further comprises a central disc, and a driving member is arranged on the central disc and is used for adjusting the included angle between the blade and the rotation plane of the blade.

In one embodiment, the blocking member is a first friction plate, a second friction plate is arranged on the blade, an elastic member is arranged in the nozzle, and the elastic force of the elastic member enables the first friction plate to be abutted with the second friction plate.

In one embodiment, the blades are provided with conductor discs, and the blocking member is an electromagnet, and the electromagnet is close to the circumferential surface of the conductor disc.

In one embodiment, a rod body is arranged in the spray head, the first friction plate, the blade and the second friction plate are all arranged on the rod body in a sliding mode, and the blade and the second friction plate can rotate.

In one embodiment, the water supply assembly is provided with a water pipe, the air supply assembly is provided with an air pipe, the spray heads are arranged at intervals along the preset direction, and the water flow direction in the water pipe is opposite to the air flow direction in the air pipe.

In one embodiment, a filter screen is disposed in the air inlet of the spray head.

In one embodiment, the water spray nozzles are arranged at intervals along the circumferential direction of the spray head, a water homogenizing ring communicated with the water spray nozzles is arranged on the spray head, and the water outlet end is communicated with the water homogenizing ring.

The invention has the beneficial effects that when the air outlet end supplies air to the spray head, the spray head sucks external air through the air suction gap, reduces the air supply amount of the air outlet end while guaranteeing the coverage range of spray sprayed by the spray head, is suitable for the working condition of larger dust content in air, firstly separates dust particles from the sucked external air through the separating piece, and collects the dust particles through the collecting piece so as to efficiently remove dust from the sucked external air and avoid the blockage phenomenon of the spray head.

Drawings

Fig. 1 is a schematic diagram of the overall structure of a dust removing device for construction provided by an embodiment of the invention;

FIG. 2 is a partial cross-sectional view of the dust collector for construction of FIG. 1;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

FIG. 4 is a front view of the dust collector for construction of FIG. 2;

FIG. 5 is a sectional view of the dust removing device B-B for construction in FIG. 4;

FIG. 6 is a diagram showing a change in the movement state of the dust removing device for construction of FIG. 5;

FIG. 7 is an enlarged view of a portion of FIG. 5 at C;

FIG. 8 is a partial enlarged view at D in FIG. 6;

Fig. 9 is a structural modification of the dust removing device for construction in fig. 7.

Wherein:

100. The device comprises a spray head, 101, a water spray nozzle, 102, an air inlet, 103, an air suction gap, 104, a water pump, 105, an air pump, 106, a mounting frame, 107, a filter screen, 108, a water homogenizing ring, 110, a separating piece, 111, a collecting piece, 112, a blade, 113, a blocking piece, 114, a central disk, 115, a first friction plate, 116, a second friction plate, 117, an elastic piece, 118, a conductor disk, 119, an electromagnet, 120, a rod body, 121, a fixing rod, 122, a baffle plate, 200, a water supply assembly, 201, a water outlet end, 202, a water delivery pipe, 300, a gas supply assembly, 301, an air outlet end, 302 and a gas delivery pipe.

Detailed Description

The present invention will be further described in detail below with reference to examples, which are provided to illustrate the objects, technical solutions and advantages of the present invention. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

The numbering of components herein, such as "first," "second," etc., is used merely to distinguish between the described objects and does not have any sequential or technical meaning. The term "coupled" as used herein includes both direct and indirect coupling (coupling), unless otherwise indicated. In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element in question must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

As shown in fig. 1 to 9, an embodiment of the present invention provides a dust removing apparatus for construction, including a spray head 100, a water supply assembly 200 and an air supply assembly 300, wherein the spray head 100 is provided with a water spray nozzle 101 and an air inlet 102 in opposition thereto, the water supply assembly 200 has an outlet end 201 communicating with the water spray nozzle 101, the air supply assembly 300 has an outlet end 301, the outlet end 301 is inserted into the air inlet 102 and is formed with an air suction gap 103, and when the outlet end 301 supplies air to the spray head 100, the spray head 100 sucks external air through the air suction gap 103;

a separating member 110 is provided in the nozzle 100 near the air inlet 102, and a collecting member 111 is provided near the water nozzle 101, and dust particles are separated from the sucked outside air by the separating member 110 and collected by the collecting member 111.

When the air outlet end 301 supplies air to the spray head 100, the spray head 100 sucks in external air through the air suction gap 103, reduces the air supply amount of the air outlet end 301 while guaranteeing the coverage range of the spray head 100 spraying water mist, adapts to the working condition that the dust content in the air is large, separates dust particles from the sucked external air through the separating piece 110, and then collects the sucked external air through the collecting piece 111, so that the spray head 100 is effectively dedusted, and the blocking phenomenon is avoided.

The air outlet end 301 has a horn-shaped outlet, so that the air blown in has a certain diffusivity. The blown air has a certain pressure and flow rate and generates a low pressure in the vicinity of the suction gap 103, thereby sucking in the outside air under the action of the atmospheric pressure.

Referring to fig. 5 and 6, the nozzle 100 may be assembled by two parts, one for setting the separating member 110 and the other for setting the collecting member 111, and for the part with the collecting member 111, the inner diameter of the part is gradually reduced from far to near the water nozzle 101, so as to increase the flow rate of air when the air is sprayed out of the nozzle 100, and improve the spraying effect. In addition, the collecting member 111 may be made of an electrostatic material, such as polypropylene, polyester fiber, etc., to adsorb the charged dust particles through permanent electrostatic charge, or the inner surface of the collecting member 111 may be coated with a viscous material, such as silica gel, resin or polymer gel, to have an ability to efficiently capture the dust particles, and of course, the collecting member 111 may be made of other materials or structures to adsorb and collect the dust particles without limitation.

Preferably, referring to fig. 3, the separating member 110 includes a plurality of blades 112 disposed at intervals in the circumferential direction, the blades 112 being disposed at an angle to the rotation plane thereof, and the sucked external air is rotated after passing the blades 112.

Since the blades 112 are disposed at an angle to the rotation plane thereof, the sucked external air flows along the inclined blades 112, thereby being rotated after passing the blades 112 to generate centrifugal force, thereby throwing out dust particles from the sucked external air.

In which the blown air is mixed with the sucked outside air and passes through the blades 112 in a substantially uniform path, pressure and flow rate, so that the dust particles are practically detached from the blown and sucked mixed air, but for convenience of description, the dust particles are hereinafter referred to as being detached from the sucked outside air.

Of course, other means of separating the dust particles from the inhaled external air, such as electrostatic precipitation, may be used, and the dust particles are charged by a high-voltage electric field, and the charged particles migrate and deposit toward the collection member 111 under the force of the electric field.

Preferably, air outlet 301 faces blade 112 to generate a rotational force and an urging force to blade 112, and blocking member 113 is provided in spray head 100, blocking member 113 generating a rotational resistance to blade 112, the rotational resistance being positively correlated with the urging force.

When the dust content in the air increases, the flow rate, pressure or flow rate of the blown air is controlled to increase, both the rotational force and the pushing force of the blown air applied to the blades 112 increase, the rotational resistance of the blocking member 113 received by the blades 112 increases, and the rotational speed of the blades 112 decreases, so that the centrifugal force generated by the rotation of the sucked outside air increases, thereby improving the dust removing effect on the sucked outside air.

The force applied to blades 112 by the air blown in at outlet 301 can be divided into a rotational force and an impulse force perpendicular to each other. The rotational force is a tangential force applied to the blades 112, so that the blades 112 rotate to reduce resistance to the incoming air, thereby reducing flow velocity consumption of the incoming air flowing in the nozzle 100, and the pushing force is an axial force applied to the blades 112, so that the blades 112 have a tendency to move away from the air outlet end 301. Rotational resistance is the force that limits the rotation of blade 112, which may be friction, magnetic, additional applied counter moment, or resistance generated by the drive train, etc.

As a structural variation of the present invention, separating element 110 further includes a central disk 114, and a driving element (not shown) is disposed on central disk 114 for adjusting the angle between blades 112 and the plane of rotation of blades 112.

The driving member may be a motor, and a plurality of driving members are arranged along the circumferential direction of the central disk 114 at intervals, and the motor is configured with a corresponding battery and a controller so as to control the start-stop and the rotation angle of the output end of the motor. The output end of the motor is arranged along the radial direction of the central disk 114 and is correspondingly fixed with the blades 112, and the output end of the motor can drive the blades 112 to rotate so as to adjust the included angle between the blades 112 and the rotating plane thereof, change the centrifugal force generated by the rotation of the sucked external air and adjust the dust removal effect on the sucked external air.

Specifically, the blades 112 form two angles of 180 ° with their rotation planes, and the smaller the absolute value of the difference between the two angles, the greater the centrifugal force generated by rotation of the sucked external air, the better the dust removal effect, and the smaller the resistance to air flow. The range of each included angle is (0 degree, 90 degree), such as 30 degree, 40 degree, 45 degree, 60 degree, etc. For example, when the two angles are 60 ° and 120 °, the centrifugal force generated by the rotation of the sucked external air by the vane 112 is greater and the resistance to the air flow is smaller than when the two angles are 45 ° and 135 °, respectively.

Preferably, the blocking member 113 is a first friction plate 115, the blade 112 is provided with a second friction plate 116, the nozzle 100 is provided with an elastic member 117, and the elastic force of the elastic member 117 makes the first friction plate 115 abut against the second friction plate 116.

When the dust content increases and the flow rate and pressure of the blown air are correspondingly increased, the air blown by the air outlet end 301 generates an increased rotational force and an increased driving force on the blade 112, and the increased driving force causes the second friction plate 116 on the blade 112 to have a tendency to move towards the first friction plate 115, so that the second friction plate 116 is in contact with the first friction plate 115 more tightly, and the friction force between the second friction plate 116 and the first friction plate 115, namely the rotational resistance, is correspondingly increased, so that the rotational speed of the blade 112 is reduced, and the centrifugal force generated by the rotation of the sucked external air is increased, thereby improving the dust removing effect on the sucked external air.

The elastic member 117 is preferably a spring, and when the elastic member 117 is disposed on a side of the blade 112 away from the air outlet end 301, the elastic member 117 is a compression spring, and when the elastic member 117 is disposed on a 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 are close to each other are friction surfaces, and anti-skid lines may be provided on the friction surfaces or made of a material having a large friction coefficient.

As a structural variant of the invention, see fig. 9, the blades 112 are provided with conductor discs 118, the blocking members 113 being electromagnets 119, the electromagnets 119 being located close to the circumferential surfaces of the conductor discs 118.

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 spaced circumferentially along the conductor disc 118 to provide a more stable and stronger magnetic induction. When the blades 112 drive 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, annular current, i.e. eddy current, is induced in the conductor disc 118, according to lenz's law, a magnetic field opposite to the static magnetic field is generated in the conductor disc 118, and the opposite magnetic field interacts with the static magnetic field to generate a resisting moment opposite to the rotating direction of the conductor disc 118, i.e. a braking moment, and meanwhile, the eddy current generates joule heat in the conductor due to resistance to convert kinetic energy of the conductor disc 118 into heat energy so as to realize speed reduction.

Braking momentB is the magnetic induction, ω is the angular velocity, r is the disc radius, that is, the braking torque T has a positive correlation with the magnetic induction B, and the magnetic field adjusting device may be provided to change the magnetic induction B of the static magnetic field generated by the electromagnet 119 so as to have a positive correlation with the flow rate and pressure of the blown air. For example, a flow rate sensor or an air pressure sensor or a flow sensor is arranged in the air outlet end 301 to obtain a flow rate or pressure or flow signal of the blown air, and the flow rate or pressure or flow signal is sent to the processor, and the processor adjusts the energizing current of the electromagnet 119 to change the magnetic induction intensity B of the static magnetic field generated by the electromagnet, so that when the dust content is increased and the flow rate and pressure of the blown air are controlled to be correspondingly increased, the magnetic induction intensity B is correspondingly increased, and thus the braking moment T is increased, the rotation resistance and the rotation speed of the blades 112 are increased, and the centrifugal force generated by rotation of the sucked external air is increased. The specific circuitry and structural design associated with electromagnet 119 is prior art and will not be described in detail herein.

Preferably, the nozzle 100 is provided with a rod 120, the first friction plate 115, the vane 112 and the second friction plate 116 are slidably disposed on the rod 120, and the vane 112 and the second friction plate 116 can rotate.

When the pushing force of the air outlet 301 on the blade 112 is greater than the elastic force of 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 received rotation resistance.

One end of the rod 120 is provided with a fixing rod 121, the fixing rod 121 is fixed in the spray head 100, the other end of the rod 120 is provided with a baffle 122, the baffle 122 is fixed with one end of the elastic member 117, and the other end of the elastic member 117 is fixed with the first friction plate 115. The cross section of the rod body 120 is circular, the first friction plate 115 is slidably sleeved on the rod body 120 through a first through hole formed in the center of the first friction plate, and the rod body 120 is slidably connected with the first through hole through a key and a key slot. The plurality of blades 112 are disposed on the circumferential surface of the central disk 114, a second through hole is formed in the center of the central disk 114, an outer ring of a bearing is fixed in the second through hole, an inner ring of the bearing is slidably sleeved on the rod 120, and of course, the inner ring of the bearing can be made of a smooth material so as to reduce the sliding friction force between the bearing and the rod 120.

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 vane 112 and the second friction plate 116 may rotate and move along the rod 120, while the first friction plate 115 may not move along the rod 120, the blown air makes the second friction plate 116 contact with the first friction plate 115 all the time, when the flow rate, pressure or flow of the blown air increases, the second friction plate 116 contacts with the first friction plate 115 more tightly, and the friction force between the two, that is, the rotation resistance, also increases correspondingly, so that the rotation speed of the vane 112 decreases, and the centrifugal force generated by rotation of the sucked external air increases, thereby improving the dust removing effect on the sucked external air.

Preferably, referring to fig. 1,2 and 4, the water supply assembly 200 has a water pipe 202, the air supply assembly 300 has an air pipe 302, and the plurality of spray heads 100 are arranged at intervals along a preset direction, and the water flow direction in the water pipe 202 is opposite to the air flow direction in the air pipe 302.

When the distance between the water pipe 202 or the air pipe 302 is longer, the pressure drop can be generated by the spray heads 100 far away from the water pump 104 and the air pump 105, so that the pressure of the spray heads 100 is reduced, the spray coverage range is affected, and the problem of tail end pressure drop caused by overlong water pipe 202 or air pipe 302 is reduced by setting the water flow direction in the water pipe 202 to be opposite to the air flow direction in the air pipe 302, so that the water mist of all Cheng Penchu of each spray head 100 is basically in a uniform state.

The water pipe 202 and the air pipe 302 are preferably disposed in parallel, and may be connected by a pipe fixing member. The water pump 104 is disposed at a first end of the water pipe 202 or the air pipe 302, and an output end thereof is communicated with the first end of the water pipe 202, the air pump 105 is disposed at a second end of the water pipe 202 or the air pipe 302, and an output end thereof is communicated with the second end of the air pipe 302, and the water pump 104 and the air pump 105 are configured with corresponding water sources or air sources, a power source and a controller so as to supply water or air continuously. Of course, a certain angle may exist between the water pipe 202 and the air pipe 302, and the preset direction may be the length direction of the water pipe 202 or the air pipe 302, or other directions in which a plurality of nozzles 100 are arranged at intervals. The spray head 100 is installed on the water pipe 202 or the air pipe 302 or other arrangement devices through the installation frame 106, and an adjusting device can be further arranged on the installation frame 106 to change the direction angle or the spraying height of the spray head 100 for spraying.

Of course, a plurality of water pumps 104 and air pumps 105 may be arranged at intervals along the preset direction, so that the water mist sprayed from each spray head 100 tends to be uniform.

Preferably, referring to fig. 2, a filter screen 107 is provided in the air inlet 102 of the spray head 100 to primarily filter the sucked external air, and of course, the filter screen 107 also has a function of separating the spray head 100 from the external space.

Preferably, referring to fig. 2, 4 and 5, the water spray nozzles 101 are arranged at intervals along the circumferential direction of the spray head 100, the spray head 100 is provided with a water homogenizing ring 108 communicated with the plurality of water spray nozzles 101, and the water outlet end 201 is communicated with the water homogenizing ring 108, so that the water spray nozzles 101 can spray water in a ring shape, the formed spray is more uniform and wider in range, and the spray effect is improved.

According to the invention, the water flow direction in the water pipe 202 is opposite to the air flow direction in the air pipe 302, so that the problem of tail end pressure drop caused by overlong water pipe 202 or air pipe 302 is reduced, and the water mist of all Cheng Penchu of each spray head 100 is basically in a uniform state.

During spraying, air is blown to the spray head 100 through the air outlet end 301, low pressure is generated near the air suction gap 103, external air is sucked, the air supply amount of the air outlet end 301 is reduced while the coverage range of water mist sprayed by the spray head 100 is ensured, the spray head is suitable for the working condition that the dust content in air is large, dust particles are firstly separated from the sucked external air through the separating piece 110, specifically, the sucked external air flows along the inclined blades 112 to rotate so as to generate centrifugal force, so that the dust particles are thrown out and separated from the sucked external air, and then the dust particles are collected through the collecting piece 111, so that the sucked external air is efficiently dedusted, and the blocking phenomenon of the spray head 100 is avoided.

When the dust content in the air increases, the flow rate, pressure or flow rate of the blown air is controlled to increase, the rotational force and the pushing force of the blown air applied to the blades 112 are increased, the rotational resistance of the blocking member 113 received by the blades 112 increases, that is, the frictional force between the first friction plate 115 and the second friction plate 116 increases, so that the rotational speed of the blades 112 decreases, and the centrifugal force generated by the rotation of the sucked outside air increases, thereby improving the dust removing effect on the sucked outside air.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples merely represent a few embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the present invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of the invention should be assessed as that of the appended claims.

Claims

1. The dust removing device for the building construction is characterized by comprising a spray head, a water supply assembly and an air supply assembly, wherein the spray head is provided with a water spray nozzle and an air inlet relatively, the water supply assembly is provided with an outlet end communicated with the water spray nozzle, the air supply assembly is provided with an outlet end, the outlet end is inserted into the air inlet and is provided with an air suction gap, and when the outlet end supplies air to the spray head, the spray head sucks external air through the air suction gap;

2. The dust collector for construction according to claim 1, wherein the separating member comprises a plurality of blades arranged at intervals in the circumferential direction, the blades being arranged at an angle to the rotation plane thereof, and the sucked outside air is rotated after passing the blades.

3. The dust collector for construction according to claim 2, wherein the air outlet end faces the blade to generate a rotational force and an urging force for the blade, a blocking member is provided in the nozzle, the blocking member generates a rotational resistance for the blade, and the rotational resistance is positively correlated with the urging force.

4. The dust collector for construction according to claim 2, wherein the separating member further comprises a center plate, and the center plate is provided with a driving member for adjusting an angle between the blade and a rotation plane of the blade.

5. The dust collector for construction according to claim 3, wherein the blocking member is a first friction plate, the blade is provided with a second friction plate, the nozzle is internally provided with an elastic member, and the elastic force of the elastic member enables the first friction plate to be abutted against the second friction plate.

6. A dust collector for construction according to claim 3, wherein the blade is provided with a conductor disc, and the blocking member is an electromagnet, and the electromagnet is located close to the circumferential surface of the conductor disc.

7. The dust collector for construction according to claim 5, wherein a rod body is provided in the nozzle, the first friction plate, the blade and the second friction plate are slidably disposed on the rod body, and the blade and the second friction plate are rotatable.

8. The dust collector for construction according to claim 1, wherein the water supply assembly has a water pipe, the air supply assembly has an air pipe, the plurality of nozzles are arranged at intervals along a predetermined direction, and a water flow direction in the water pipe is opposite to an air flow direction in the air pipe.

9. The dust collector for construction according to claim 1, wherein a filter screen is provided in the air inlet of the nozzle.

10. The dust collector for construction according to claim 1, wherein a plurality of water nozzles are arranged at intervals along the circumferential direction of the nozzle, a water homogenizing ring communicated with the plurality of water nozzles is arranged on the nozzle, and the water outlet end is communicated with the water homogenizing ring.