Environment-friendly dust falling equipment for road and bridge construction

Abstract

The invention relates to the field of dust falling equipment, and discloses environment-friendly dust falling equipment for road and bridge construction, the environment-friendly dust falling equipment for road and bridge construction comprises two or more mounting columns, and a spraying assembly and a cleaning assembly which are mounted at the top and inside the mounting columns, a baffle is fixedly arranged between every two mounting columns, and the spraying assembly and the cleaning assembly are arranged in the mounting columns. The length of the baffle can be adjusted along with the distance of water mist sprayed by the spraying assembly, the environment-friendly dust falling equipment for road and bridge construction is provided with the spraying assembly and has the advantages of being convenient to install and short in installation time, flying dust overflowing can be reduced, the flying dust can be collected, and therefore secondary flying dust can be reduced; the internal dust increasing speed is slowed down; the burden of equipment is relieved; the special included angle of the water mist can prevent dust from overflowing, pollution to other areas is avoided, the crosswind resistance can be enhanced, the sprayed water mist can be reused, water consumption is reduced, and water in the water supply pipe can be pressurized to guarantee the quality of the mist curtain.

Description

Technical Field

[0001] The invention relates to the technical field of dust reduction equipment, and in particular to environmentally friendly dust reduction equipment for road and bridge construction. Background Art

[0002] In the patent application with application announcement number CN118904004A, it includes a fog cannon, and the equipment also includes a number of dust removal auxiliary equipment used in conjunction with the fog cannon, the dust removal auxiliary equipment includes a dust suction bracket composed of a number of dust suction pipes and a support rod connected to the dust suction bracket and composed of a number of spiral filter cartridges; the spiral filter in each spiral filter cartridge is connected to the motor through a rotating shaft, and the rotating shaft is connected to a speed sensor; when the motor does not rotate, the rotating shaft together with the spiral filter is in a free rotation state; the metal ball placed on the spiral filter is fixed on the connecting rod, the connecting rod is rotatably connected to the spiral filter, and the connecting rod is connected to a waterproof cloth; the dust removal auxiliary equipment is installed at a preset distance from the fog cannon, and the air sucked into the dust suction pipe is sequentially passed through the motor. through all spiral filter cartridges; the speeds collected by the speed sensors are arranged into a speed sequence in the order of the speed sensors from top to bottom, and the working mode of the dust removal auxiliary equipment is changed according to the decreasing trend of the speed sequence, the working mode including the dust removal mode and the cleaning mode. In the dust removal mode, the motor rotates in the positive direction, while the connecting rod does not rotate, and the waterproof cloth is in a folded state. The speed of the motor in the dust removal mode is positively correlated with the difference in speed in the speed sequence; in the cleaning mode, the motor rotates in the reverse direction, and water is injected into the spiral filter cartridge from bottom to top. The metal ball drives the connecting rod to rotate, and the waterproof cloth is stretched. The stretched waterproof cloth and the spiral filter mesh rotating in the reverse direction pressurize water and then inject it into the dust suction pipe. The speed of the motor in the cleaning mode is positively correlated with the mean of the speed sequence. Advantages: Through the cooperation of the motor and the spiral filter, the dust removal auxiliary equipment has multiple working modes. Each working mode further directly or indirectly enhances the dust removal effect by controlling the motor. For example, in the dust removal mode, by actively controlling the rotation of the spiral filter, the task pressure of filtering dust is distributed, avoiding the situation where part of the spiral filter has lost its filtering function (that is, it bears a greater task pressure of filtering dust), but the other part of the spiral filter has not yet fully exerted its filtering potential. In the cleaning mode, the water pressure during cleaning can be controlled by controlling the rotation of the motor to ensure the cleaning effect.

[0003] In the prior art including the above-mentioned patent, when atomized gas is used for dust suppression, the mist that adsorbs dust will float in the air for a period of time before falling to the ground. There are two problems with the existing devices: First, the floating time and moving distance of the water mist in the air are affected by the ambient wind. When the ambient wind reaches level 3 or above (construction sites stop work when the wind is above level 6), the floating time and distance of the water mist will increase. This not only makes it easy for workers to inhale more dust, but also may cause unnecessary pollution to other non-construction areas after the water mist dries on the ground. Second, after the water mist adsorbs dust and falls to the ground, and the water vapor dries, secondary dust is likely to be generated due to factors such as personnel movement, equipment operation, or ambient wind, increasing the working pressure of the equipment. Although the above-mentioned patent is provided with a filtering component, it can only filter, and the collected dust will still fall to the ground, causing secondary dust under the action of the same factors. The patented device also has a self-cleaning component, which can extend the service life of the device and reduce the maintenance frequency, but it increases the overall usage cost of the device, and the structure is relatively complex, greatly increasing the cost of the construction site, resulting in a small actual purchase volume. Moreover, the device is a circular or fan-shaped area centered on the fog cannon machine with the shooting range as the radius, and is suitable for scenarios with a large amount of dust generated during blasting, demolition, etc. If it is used for daily dust suppression in construction sites, the cost is too high. And the existing dust suppression devices used around construction sites, although low in cost, not only have the above-mentioned problems, but also there is a probability that the sprayed water mist will float outside the construction site. Summary of the Invention

[0004] The problem to be solved by the present invention is that the water mist is easily carried by the wind to float to other places with dust and cause adverse effects.

[0005] To solve the above technical problems, the technical solution of the present invention is: An environmental protection dust suppression device for road and bridge construction, including installation columns and a spraying component and a cleaning component installed on the top and inside of the installation columns. The number of the installation columns is two or more, and a baffle is fixedly arranged between every two installation columns. The length of the baffle can be adjusted according to the distance of the water mist sprayed by the spraying component. The spraying component is used for spraying water mist and inhaling the polluted water mist, and the spraying component can also drive relevant components in the cleaning component to work during operation. The cleaning component is used for filtering, collecting the collected water mist and reducing water consumption.

[0006] Preferably, the spraying component includes a collecting pipe, which is arranged on one side of the upper end of the installation column and is used for collecting and guiding the water mist downward. On the other side of the collecting pipe, there is an installation pipe, which is also installed on the installation column. Seven atomizing nozzles are fixedly arranged on the side of the installation pipe away from the installation column, and there is an included angle between the atomizing nozzles and the baffle.

[0007] Preferably, sliding rails are fixedly arranged on the opposite sides of the collecting pipe and the installation pipe. A number of through holes are formed in the sliding rails. The collecting pipe and the installation pipe are connected to the installation column through the sliding rails and the through holes in the sliding rails. A Venturi tube is arranged inside the installation column. The Venturi tube is located at the lower end of the collecting pipe and is connected thereto.

[0008] Preferably, two Venturi tubes are provided. The side branch tubes of the Venturi tubes pass through the partition in the middle of the interior of the installation column and communicate with the cavity on the other side of the installation column. A water supply pipe is fixedly arranged at the lower end of the Venturi tube. The water supply pipe consists of two parts. One part is located inside the installation column, and the other part is located outside the installation column and is connected to an external water pump.

[0009] Preferably, the cleaning assembly includes a filter screen. The filter screen is fixedly arranged at the cavity inside the installation column. The filter screen is located on one side of the side branch tube of the Venturi tube. The filter screen is inclined. A limiting ring is arranged on the side of the filter screen away from the side branch tube of the Venturi tube. The limiting ring is fixedly connected to the installation column.

[0010] Preferably, two limiting rings are provided in each group, and a total of five groups of limiting rings are provided. The five groups of limiting rings are parallel to the filter screen. A clamping plate is arranged inside each group of limiting rings. Two clamping plates are provided in each group of limiting rings. Five cloth strips are arranged between the two clamping plates. The width of the five cloth strips installed behind the clamping plates is the same as that of the filter screen. Reinforcing knots are fixedly arranged at the ends of the cloth strips. The ends of the cloth strips are in contact with the surface of the filter screen.

[0011] Preferably, a spiral rod is arranged below the filter screen. Two spiral rods are symmetrically arranged along the center line of the installation column. The spiral rods do not contact each other. The lower end of the spiral rod is rotatably connected to the installation column. A discharge bin is formed at the connection between the spiral rod and the installation column. An operation bin is formed through the installation column below the discharge bin. A sealing plate is fixedly arranged on the outside of the discharge bin.

[0012] Preferably, the lower end of the spiral rod passes through the installation column between the discharge bin and the operation bin and is fixedly provided with a gear through a bolt. The gear is located at the upper end inside the operation bin. The gear is rotatably connected to the installation column. The gears at the lower ends of the two spiral rods are meshed with each other. The thread direction of the bolt at the lower end of the gear is opposite to the rotation direction of the gear. The upper end of the spiral rod is located below the lowermost limiting ring. A funnel-shaped cavity is formed through the installation column around the upper end of the spiral rod.

[0013] Preferably, an inclined surface is provided in the collection pipe of the spray assembly. The inclined surface of the collection pipe is horizontally installed with respect to the atomizing nozzle. The inclined surface of the collection pipe is provided on the side away from the water supply pipe. The atomizing nozzle inclines towards the water supply pipe side. The water supply pipe is always installed inside the baffle (the side close to the construction area). The included angle between the atomizing nozzle and the baffle is related to the spraying angle of the atomizing nozzle. The outer side of the fan-shaped water mist ejected by the atomizing nozzle should be located inside the inclined surface of the collection pipe. The adjacent collection pipe and installation pipe at the corner need to be connected through a connecting block.

[0014] Preferably, the screw rod and the sealing plate in the cleaning assembly can be selectively installed according to actual conditions during use. A sealing member is provided at the part where the screw rod passes through the installation column.

[0015] Compared with the prior art, the technical solution of the present invention has the following advantages: (1) Through the setting of the installation column, the baffle and the spray assembly, firstly, the device itself can play the role of a traditional construction site fence. In this way, after the workers complete the installation, they only need to connect the water supply pipe to the lower part of the Venturi tube to make the device start working directly. Compared with the existing spray pipes installed above the fence, it has the advantages of easy installation and less installation time. Secondly, through the collection pipe and the atomizing nozzle in the spray assembly, a mist curtain can be formed above the fence. By using this, not only can the escaping dust be reduced, but also the mist curtain carrying the dust can be collected in time to prevent it from floating in the air for a long time. Thus, the wet dust falling to the ground can be reduced, and the secondary dust generation caused by the drying of the wet dust can be prevented. Furthermore, the speed of dust increase in the construction site can be slowed down and the working burden of the dust reduction equipment can be reduced. Moreover, the included angle between the water mist ejected by the atomizing nozzle and the collection pipe can further prevent the dust in the construction site from overflowing. In this way, not only can the unnecessary pollution of the non-construction area caused by the water mist carrying dust be avoided, but also the deviation amount of the mist curtain can be reduced when encountering a crosswind, thereby preventing the water mist from directly drifting with the wind. Furthermore, a large amount of water mist can be prevented from falling on the pedestrians outside the construction site. Finally, under the action of the Venturi tube, the ejected water mist can be reused. In this way, not only can the consumption of water resources be reduced, but also the water in the water supply pipe can be pressurized to make it have a higher initial velocity when ejected, thereby ensuring the quality of the mist curtain to a certain extent. (2) Through the setting of the cleaning component, the collected water mist can be filtered, which can ensure that when the Venturi tube re-uses the water mist, it will not re-spray the dust. Moreover, the cleaning component can also collect the filtered dust, which can not only extend the service life of the filter screen, but also reduce the influence of the dust on the suction force generated by the Venturi tube on the filter screen. Thus, it can provide a certain degree of guarantee for the operation of the collection tube. And by changing the combination method of the parts in the cleaning component, it can assist the collection tube and the atomizing nozzle to cope with different wind speeds and different dust conditions, so as to meet the dust reduction requirements at different construction stages and different wind speeds, and meet the dust collection requirements under different dust reduction requirements. Description of the Drawings

[0016] Figure 1 Schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 Schematic diagram of the single structure of the present invention; Figure 3 Schematic diagram of the cross-sectional structure of the mounting column of the present invention; Figure 4 For the present invention Figure 3 Enlarged schematic diagram of part A in; Figure 5 Enlarged schematic diagram of the partial cross-section of the mounting column of the present invention; Figure 6 Schematic diagram of the dust-sweeping structure in the cleaning component of the present invention; Figure 7 Schematic diagram of the partial cross-section (without filter screen and dust-sweeping structure) of the mounting column of the present invention; Figure 8 For the present invention Figure 7 Enlarged schematic diagram of part B in; Figure 9 Schematic diagram of the collection tube, mounting tube and atomizing nozzle structure of the present invention; Figure 10 Schematic diagram of the three-dimensional structure of the connecting block of the present invention.

[0017] In the figure: 1, mounting column; 2, baffle; 3, spray assembly; 301, collection tube; 302, mounting tube; 303, atomizing nozzle; 304, slide rail; 305, Venturi tube; 306, water supply pipe; 4, cleaning component; 401, filter screen; 402, limit ring; 403, clamping plate; 404, cloth strip; 405, reinforcement joint; 406, screw rod; 407, discharge bin; 408, sealing plate; 409, operation bin; 410, gear; 5, connecting block. Detailed Embodiments

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure clearer, the following will clearly and completely describe the technical solutions of the embodiments of the present disclosure with reference to the accompanying drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present disclosure without creative efforts belong to the scope of protection of the present disclosure.

[0019] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure shall have the ordinary meanings understood by those of ordinary skill in the art to which the present disclosure pertains. The terms such as "including" or "comprising" used in the present disclosure mean that the elements or objects appearing before the term cover the elements or objects listed after the term and their equivalents, without excluding other elements or objects. The terms such as "connected" or "coupled" do not limit to physical or mechanical connections, and may also include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left", "right", etc. are only used to represent relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0020] As Figures 1 to 10 shown, an environmentally friendly dust suppression device for road and bridge construction provided by the present invention includes mounting columns 1, and a spray assembly 3 and a cleaning assembly 4 mounted on the top and inside of the mounting columns 1. The number of mounting columns 1 is two or more. A baffle 2 is fixedly arranged between every two mounting columns 1. The length of the baffle 2 can be adjusted according to the distance of the water mist sprayed by the spray assembly 3. The spray assembly 3 is used to spray water mist and inhale the polluted water mist. The spray assembly 3 can also drive relevant components in the cleaning assembly 4 to work during operation. The cleaning assembly 4 is used to filter, collect, and reduce water consumption of the collected water mist.

[0021] The spray assembly 3 includes a collection pipe 301, which is arranged on one side of the upper end of the mounting column 1 and is used to collect and guide the water mist downward. On the other side of the collection pipe 301, there is a mounting pipe 302, which is also mounted on the mounting column 1. Seven atomizing nozzles 303 are fixedly arranged on the side of the mounting pipe 302 away from the mounting column 1. There is an angle between the atomizing nozzles 303 and the baffle 2.

[0022] On the opposite sides of the collection pipe 301 and the mounting pipe 302, there are fixedly arranged slide rails 304, and a number of through holes are formed in the slide rails 304. The collection pipe 301 and the mounting pipe 302 are connected to the mounting column 1 through the slide rails 304 and the through holes in the slide rails 304. A Venturi tube 305 is arranged inside the mounting column 1, and the Venturi tube 305 is located at the lower end of the collection pipe 301 and is connected thereto.

[0023] There are two Venturi tubes 305 in total. The side branch tubes of the Venturi tubes 305 pass through the partition in the middle of the installation column 1 and are in communication with the cavity on the other side of the installation column 1. A water supply pipe 306 is fixedly arranged at the lower end of the Venturi tube 305. The water supply pipe 306 consists of two parts. One part is located inside the installation column 1, and the other part is located outside the installation column 1 and is connected to an external water pump.

[0024] The cleaning assembly 4 includes a filter screen 401. The filter screen 401 is fixedly arranged at the cavity inside the installation column 1. The filter screen 401 is located on one side of the side branch tube of the Venturi tube 305. The filter screen 401 is inclined. A limiting ring 402 is arranged on the side of the filter screen 401 away from the side branch tube of the Venturi tube 305. The limiting ring 402 is fixedly connected to the installation column 1.

[0025] There are two limiting rings 402 in each group, and there are five groups of limiting rings 402 in total. The five groups of limiting rings 402 are parallel to the filter screen 401. A clamping plate 403 is arranged inside each group of limiting rings 402. There are two clamping plates 403 in each group of limiting rings 402. Five cloth strips 404 are arranged between the two clamping plates 403. The width of the five cloth strips 404 installed behind the clamping plates 403 is the same as that of the filter screen 401. A reinforcing knot 405 is fixedly arranged at the end of the cloth strip 404. The end of the cloth strip 404 is in contact with the surface of the filter screen 401.

[0026] To slow down the speed of dust accumulation on the surface area of the cloth strip 404, the material of the cloth strip 404 should be a material that is not easy to absorb water, has a smooth surface, and is relatively light in self-weight, such as polyester fiber, nylon, etc. A screw rod 406 is arranged below the filter screen 401. There are two screw rods 406 symmetrically arranged along the center line of the installation column 1. The two screw rods 406 do not touch each other. The lower end of the screw rod 406 is rotatably connected to the installation column 1. A discharge bin 407 is opened at the connection between the screw rod 406 and the installation column 1. An operation bin 409 is opened below the discharge bin 407 through the installation column 1. A sealing plate 408 is fixedly arranged outside the discharge bin 407.

[0027] The lower end of the screw rod 406 passes through the installation column 1 between the discharge bin 407 and the operation bin 409 and is fixedly provided with a gear 410 through a bolt. The gear 410 is located at the upper end inside the operation bin 409. The gear 410 is rotatably connected to the installation column 1. The gears 410 at the lower ends of the two screw rods 406 are meshed with each other. The thread direction of the bolt at the lower end of the gear 410 is opposite to the rotation direction of the gear 410. The upper end of the screw rod 406 is located below the lowermost limiting ring 402. A funnel-shaped cavity is opened around the upper end of the screw rod 406 through the installation column 1.

[0028] An inclined surface is provided in the collection pipe 301 of the spray assembly 3. The inclined surface of the collection pipe 301 is horizontally installed with respect to the atomizing nozzle 303. The inclined surface of the collection pipe 301 is provided on the side away from the water supply pipe 306. The atomizing nozzle 303 inclines towards the water supply pipe 306. The water supply pipe 306 is always installed on the inner side of the baffle 2 close to the construction area. The included angle between the atomizing nozzle 303 and the baffle 2 is related to the spraying angle of the atomizing nozzle 303. The outer side of the fan-shaped water mist sprayed by the atomizing nozzle 303 should be located inside the inclined surface of the collection pipe 301. The adjacent collection pipe 301 and the installation pipe 302 at the corner need to be connected by the connecting block 5.

[0029] In the cleaning assembly 4, the screw rod 406 and the sealing plate 408 can both be selected to be installed or not according to the actual situation during use. A sealing member is provided on the part of the screw rod 406 passing through the installation column 1.

[0030] The working principle and usage process of the present invention: During use, first start the external water pump to supply water to the atomizing nozzle 303 through the water supply pipe 306. The high-pressure water flow in the water supply pipe 306 enters the installation pipe 302 through the Venturi tube 305 and starts to work after the pressure reaches a predetermined value. There are two situations for the water mist sprayed by the atomizing nozzle 303: First, most of the water mist enters the collection pipe 301 above the baffle 2 and moves downward under the action of the Venturi tube 305. After the water mist carrying the dust enters the cavity where the filter screen 401 is located, it passes through the filter screen 401 under the suction of the Venturi tube 305. The dust is filtered by the filter screen 401, and the filtered water mist re-enters the Venturi tube 305, mixes with the internal high-pressure water flow, and is sprayed out again from the atomizing nozzle 303; Second, a small part of the water mist leaves the collection range of the collection pipe 301 after being sprayed out and can re-enter the collection pipe 301 when the wind blows, and the outer water mist will not deviate significantly. After the water mist carrying the dust is collected, it is divided into four working modes according to different configurations: When the screw rod 406 and the sealing plate 408 are installed, the suction generated by the Venturi tube 305 at the filter screen 401 is the strongest. The dust filtered by the filter screen 401 adheres to the surface. One side of the cloth strip 404 swings with the flow of the gas in the installation column 1, knocks and sweeps the filter screen 401 to make the dust fall, and accumulates around the screw rod 406. During cleaning, open the sealing plate 408, place the container for collection outside the discharge bin 407, and use tools such as an electric drill and a wrench to connect the bolts below the gear 410 to drive the two screw rods 406 to rotate, squeezing out the dust into the container. This is applicable to the working conditions with a moderate amount of dust and a relatively high wind speed. When the screw rod 406 and the sealing plate 408 are not installed, the suction force generated by the Venturi tube 305 at the filter screen 401 is the weakest. It is necessary to place collection equipment such as a vacuum cleaner outside the discharge bin 407 for a long time. Most of the water mist is sucked into the collection equipment through the discharge bin 407, and a small part returns to the Venturi tube 305 through the filter screen 401. This can reduce the pressure on the filter screen 401 and is applicable to working conditions with excessive dust and high wind speed (wind speed of level 6 and below). When only the screw rod 406 is installed, the suction force of the Venturi tube 305 is only better than the situation where neither the screw rod 406 nor the sealing plate 408 is installed. At this time, a collection container needs to be placed outside the discharge bin 407. A driving device such as a motor is connected below the screw rod 406, which can quickly discharge the filtered dust and is applicable to situations with more dust and smaller wind speed. When only the sealing plate 408 is installed, the suction force of the Venturi tube 305 is second only to the situation where both the screw rod 406 and the sealing plate 408 are installed. The filtered dust automatically passes through the original installation position of the screw rod 406 and accumulates from bottom to top in the discharge bin 407, which is applicable to working conditions with moderate dust quantity and moderate wind speed.

[0031] The above embodiments are only exemplary embodiments of the present invention and are not used to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements within the essence and protection scope of the present invention, and such modifications or equivalent replacements should also be regarded as falling within the protection scope of the present invention.

Claims

1. An environmentally friendly dust suppression device for road and bridge construction, comprising a mounting column (1) and a spray assembly (3) and a cleaning assembly (4) installed at the top and inside of the mounting column (1), characterized in that: The number of the installation columns (1) is two or more, and a baffle (2) is fixedly arranged between every two installation columns (1). The length of the baffle (2) can be adjusted according to the distance of the water mist sprayed by the spray assembly (3). The spray assembly (3) is used for spraying water mist and inhaling the contaminated water mist. The spray assembly (3) can also drive relevant components in the cleaning assembly (4) to work during operation. The cleaning assembly (4) is used for filtering, collecting the collected water mist and reducing water consumption.

2. The environmental protection dust reduction equipment for road and bridge construction according to claim 1, characterized in that: The spray assembly (3) includes a collection pipe (301). The collection pipe (301) is arranged on one side of the upper end of the installation column (1). The collection pipe (301) is used for collecting and guiding the water mist downward. An installation pipe (302) is arranged on the other side of the collection pipe (301). The installation pipe (302) is also installed on the installation column (1). Seven atomizing nozzles (303) are fixedly arranged on the side of the installation pipe (302) away from the installation column (1). There is an included angle between the atomizing nozzles (303) and the baffle (2).

3. An environmental protection dust reduction device for road and bridge construction according to claim 2, characterized in that: Sliding rails (304) are fixedly arranged on the opposite surfaces of the collection pipe (301) and the installation pipe (302). A number of through holes are formed in the sliding rails (304). The collection pipe (301) and the installation pipe (302) are connected to the installation column (1) through the sliding rails (304) and the through holes in the sliding rails (304). A Venturi tube (305) is arranged inside the installation column (1). The Venturi tube (305) is located at the lower end of the collection pipe (301) and is connected thereto.

4. An environmental protection dust reduction device for road and bridge construction according to claim 3, characterized in that: There are two Venturi tubes (305) in total. The side branch tubes of the Venturi tubes (305) pass through the partition in the middle of the inside of the installation column (1) and are communicated with the cavity on the other side of the installation column (1). A water supply pipe (306) is fixedly arranged at the lower end of the Venturi tube (305). The water supply pipe (306) is composed of two parts. One part is located inside the installation column (1), and the other part is located outside the installation column (1) and is connected to an external water pump.

5. An environmental dust reduction device for road and bridge construction according to claim 1, characterized in that: The cleaning assembly (4) includes a filter screen (401). The filter screen (401) is fixedly arranged at the cavity inside the installation column (1). The filter screen (401) is located on one side of the side branch tube of the Venturi tube (305). The filter screen (401) is inclined. A limiting ring (402) is arranged on the side of the filter screen (401) away from the side branch tube of the Venturi tube (305). The limiting ring (402) is fixedly connected to the installation column (1).

6. An environmental protection dust reduction device for road and bridge construction according to claim 5, characterized in that: There are two limiting rings (402) in each group, and a total of five groups of limiting rings (402) are provided. The five groups of limiting rings (402) are parallel to the filter screen (401). Inside each group of limiting rings (402), there is a clamping plate (403). There are two clamping plates (403) in each group of limiting rings (402). A cloth strip (404) is arranged between the two clamping plates (403). There are five cloth strips (404) arranged between the two clamping plates (403). The width of the five cloth strips (404) installed behind the clamping plates (403) is the same as that of the filter screen (401). A reinforcing knot (405) is fixedly arranged at the end of the cloth strip (404). The end of the cloth strip (404) is in contact with the surface of the filter screen (401).

7. An environmental protection dust reduction device for road and bridge construction according to claim 6, characterized in that: Below the filter screen (401), there is a screw rod (406). There are two screw rods (406) symmetrically arranged along the center line of the mounting column (1). The two screw rods (406) do not touch each other. The lower end of the screw rod (406) is rotatably connected to the mounting column (1). A discharge bin (407) is provided at the connection between the screw rod (406) and the mounting column (1). Below the discharge bin (407), an operation bin (409) is provided through the mounting column (1). A sealing plate (408) is fixedly arranged on the outside of the discharge bin (407).

8. The environmental protection dust reduction equipment for road and bridge construction according to claim 7, characterized in that: The lower end of the screw rod (406) passes through the mounting column (1) between the discharge bin (407) and the operation bin (409) and is fixedly provided with a gear (410) through a bolt. The gear (410) is located at the upper end inside the operation bin (409). The gear (410) is rotatably connected to the mounting column (1). The gears (410) at the lower ends of the two screw rods (406) are meshed with each other. The thread direction of the bolt at the lower end of the gear (410) is opposite to the rotation direction of the gear (410). The upper end of the screw rod (406) is located below the lowermost limiting ring (402). A funnel-shaped cavity is provided around the upper end of the screw rod (406) through the mounting column (1).

9. An environmental protection dust reduction device for road and bridge construction according to claim 2-4, characterized in that: An inclined surface is provided inside the collection pipe (301) of the spray assembly (3). The inclined surface of the collection pipe (301) is horizontally installed with the atomizing nozzle (303). The inclined surface of the collection pipe (301) is provided on the side away from the water supply pipe (306). The atomizing nozzle (303) inclines towards the water supply pipe (306). The water supply pipe (306) is always installed inside the baffle (2) (on the side close to the construction area). The included angle between the atomizing nozzle (303) and the baffle (2) is related to the spraying angle of the atomizing nozzle (303). The outer side of the fan-shaped water mist sprayed by the atomizing nozzle (303) should be located inside the inclined surface of the collection pipe (301). The adjacent collection pipe (301) and installation pipe (302) at the corner need to be connected through a connecting block (5).

10. An environmental protection dust reduction device for road and bridge construction according to claims 5-8, characterized in that: The screw rod (406) and the sealing plate (408) in the cleaning component (4) can be selectively installed or not according to the actual situation during use. A sealing member is provided on the part of the screw rod (406) passing through the mounting column (1).

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