Groove cleaning and dust removing device applied to asphalt pavement maintenance

Abstract

The invention discloses a groove cleaning and dust removing device applied to asphalt pavement maintenance, and belongs to the technical field of dust removing equipment, the groove cleaning and dust removing device comprises a box body, a fan and a multi-stage dust removing assembly, the fan and the multi-stage dust removing assembly are connected through a ventilation pipeline, the upper part of the box body is provided with a dust suction pipe and an air outlet, and the bottom of the box body is provided with a discharge port; the dust suction pipe is connected with an air inlet in the head end of the multi-stage dust removal assembly, and the tail end of the multi-stage dust removal assembly is connected with an air outlet through a fan and a ventilation pipeline. The multi-stage dust removal assembly can sequentially capture dust with the particle size of 0.0025 mm or above according to the particle size of the dust from large to small. The fan and the multi-stage dust removal assembly are arranged in the box body, the dust with the particle size of 0.0025 mm or above is effectively captured through the multi-stage dust removal assembly, the dust is sequentially removed according to the particle size of the dust from large to small, the captured dust is classified according to the particle size, and recycling of pavement materials is facilitated. According to the invention, the milling and groove cleaning requirements of road maintenance can be met, dust emission is effectively reduced, and the environment is protected.

Description

Technical Field

[0001] The invention belongs to the technical field of dust removal equipment, and in particular relates to a groove cleaning and dust removal device used for asphalt pavement maintenance. Background Art

[0002] In the process of road maintenance, it is usually necessary to mill and clean the damaged asphalt pavement, which will generate a large number of dust particles of different sizes, such as gravel, sand, and dust. These dusts will spread into the air and pollute the surrounding environment.

[0003] When milling and cleaning existing roads, large particles of crushed materials and small particles of dust will be generated. When cleaning the groove, large particles of crushed materials are often removed manually, and for the small particles of dust in the groove, some people use blowers to blow them away, which will generate a lot of dust during this period. In addition, the road maintenance is usually one-way, and if there is too much dust, it will affect the driver's line of sight on the other side of the road, which is easy to cause traffic accidents. If a large amount of dust is generated during the milling and cleaning of urban roads, it will damage the living environment around the road and have an adverse effect on the city's image. Therefore, dust removal is necessary during the road milling and cleaning process.

[0004] Another group of people use a single-stage gravity dust removal device to clean the groove. Since the particle sizes produced by the milling process vary greatly, when using a single-stage dust removal device to clean the groove, in order to inhale large-size particles, there are often high requirements for the air flow rate. However, due to its own limitations, the small-size dust cannot be fully settled when the air flow rate is high. Therefore, a large amount of small-size dust will be discharged into the air with the airflow. This dust removal method has low dust removal accuracy. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a groove cleaning and dust removal device for asphalt pavement maintenance.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is as follows: A trough cleaning and dust removal device for asphalt pavement maintenance comprises a box body and a fan and a multi-stage dust removal component therein, wherein the fan and the multi-stage dust removal component are connected via a ventilation duct, a dust suction pipe and an air outlet are provided at the top of the box body, and an openable discharge port is provided at the bottom, the dust suction pipe is connected to the air inlet at the head end of the multi-stage dust removal component, and the rear end of the multi-stage dust removal component is connected to the air outlet via the fan and the ventilation duct; the multi-stage dust removal component can remove dust generated by road maintenance trough cleaning in descending order according to the particle size thereof, and is used for classifying and capturing dust with a particle size of 0.0025 mm and above.

[0007] Furthermore, the multi-stage dust removal assembly includes a primary dust removal unit, a secondary dust removal unit and a tertiary dust removal unit. The top air inlet of the primary dust removal unit is connected to the dust suction pipe, the bottom of the primary dust removal unit is provided with a switchable second unloading door, the exhaust port of the primary dust removal unit is connected to the air inlet of the secondary dust removal unit; the bottom dust exhaust port of the secondary dust removal unit is connected to the unloading port, the exhaust port of the secondary dust removal unit is connected to the air inlet of the tertiary dust removal unit; the bottom dust exhaust port of the tertiary dust removal unit is connected to the unloading port, and the exhaust port of the tertiary dust removal unit is connected to the air outlet through a fan.

[0008] Furthermore, the primary dust removal unit includes a dust removal arc plate and a gravity dust removal box, the dust removal arc plate is arranged above the gravity dust removal box, the dust removal arc plate is an upright U-shaped plate, the open end of the dust removal arc plate is connected to the inner wall of the box body, and is surrounded to form a channel with a U-shaped cross section; the upper end of the dust removal arc plate is sealed and connected to the top wall of the box body, the inlet of the dust removal arc plate is connected to the dust suction pipe and is arranged at the upper part of the side wall of the box body, the inlet of the dust removal arc plate is tangent to the side wall, and the lower end outlet of the dust removal arc plate extends into the gravity dust removal box; the inlet cross-sectional size of the gravity dust removal box is larger than the outlet cross-sectional size of the dust removal arc plate, the bottom dust exhaust port of the gravity dust removal box is connected to the discharge port, and the exhaust port of the gravity dust removal box is connected to the air inlet of the secondary dust removal unit.

[0009] Furthermore, the secondary dust removal unit includes multiple cyclone dust collectors, the air inlets of the multiple cyclone dust collectors are connected in parallel with the exhaust outlet of the gravity dust collection box through ventilation ducts, the dust exhaust outlets of the multiple cyclone dust collectors are connected to the discharge port, and the exhaust outlets of the multiple cyclone dust collectors are connected to the air inlet of the tertiary dust removal unit through ventilation ducts.

[0010] Furthermore, the three-stage dust removal unit is a cartridge dust collector, the exhaust port of the cartridge dust collector is connected to the fan inlet, the fan outlet is connected to the air outlet; the dust exhaust port of the cartridge dust collector is connected to the discharge port.

[0011] Furthermore, the filtration accuracy of the cartridge dust collector is 0.0025 mm, and silencers are provided between the exhaust port and the fan, and between the fan and the air outlet of the cartridge dust collector.

[0012] Furthermore, the box body has a rectangular parallelepiped structure, and the vacuum tube is a 5 mm corrugated tube.

[0013] Furthermore, the air outlet on the top of the box is provided with a rainproof cap, the bottom of the box is provided with an ash hopper, the dust exhaust ports of the secondary dust removal unit and the tertiary dust removal unit are connected to the corresponding chambers in the ash hopper, the dust exhaust port of the secondary dust removal unit is provided with a switchable third unloading door, and the bottom unloading port of the ash hopper is provided with a switchable first unloading door, one end of the first unloading door is hinged to the bottom of the box, and the other end is connected to the side wall of the box by a snap.

[0014] Furthermore, one end of the second discharge door at the bottom of the primary dust removal unit is hinged to the bottom of the box body, and the other end is connected to the outer side wall of the box body through a telescopic rod.

[0015] Compared with the prior art, the present invention has the following technical advances: The device arranges a fan and a multi-stage dust removal component in the box body, uses the multi-stage dust removal component to effectively capture dust with a particle size of 0.0025 mm and above, and removes dust from large to small in order according to the particle size of dust generated by road maintenance and trough cleaning, and classifies the captured dust according to the particle size, which is conducive to the recycling and reuse of road surface materials. The present invention can meet the requirements of road maintenance milling and trough cleaning, while effectively reducing dust emissions and protecting the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0017] In the attached picture: Figure 1 A schematic diagram of the structure of a groove cleaning and dust removal device for asphalt pavement maintenance provided by an embodiment of the present invention; Figure 2 for Figure 1 Schematic diagram of the internal structure of the dust removal device in the middle cleaning tank; Figure 3 It is a schematic structural diagram of the tank cleaning and dust removal device of the present invention from another angle; Figure 4 for Figure 1 Front view of the dust removal device in the middle cleaning tank; Figure 5 for Figure 1 Right side view of the dust removal device in the middle cleaning tank; Figure 6 for Figure 1 Rear view of the dust removal device in the middle cleaning tank; Figure 7 for Figure 1 Left side view of the dust removal device in the middle cleaning tank; Figure 8 This is a diagram showing the flow velocity simulation result in the dust collection pipe in the simulation design of the present invention; Fig. 9This is a diagram of the pressure simulation result in the dust suction pipe in the simulation design of the present invention; Fig.10 This is a simulation result diagram of the velocity of particles with a diameter of 1 mm in the simulation design of the present invention; Fig.11 This is a simulation result diagram of the particle velocity with a diameter of 0.1 mm in the simulation design of the present invention; Fig.12 This is a simulation result diagram of the particle velocity with a diameter of 0.01 mm in the simulation design of the present invention; Fig.13 It is a simulation result diagram of PM5 diameter particle velocity in the simulation design of the present invention; Fig.14 This is a simulation result diagram of PM2.5 diameter particle velocity in the simulation design of the present invention; Fig.15 This is the dust removal efficiency diagram when there is no dust removal arc plate in the simulation design; Fig.16 This is the dust removal efficiency diagram when there is a dust removal arc plate in the simulation design; Fig.17 This is a simulation result diagram of the dust removal efficiency of the present invention; In the figure: 100-primary dust removal unit, 200-secondary dust removal unit, 300-tertiary dust removal unit; 1-box; 2-fan; 3-ventilation duct; 4-dust suction pipe; 5-first unloading door; 6-second unloading door; 7-dust removal arc plate; 8-gravity dust removal box; 9-cyclone dust collector; 10-cartridge dust collector; 11-rain cap; 12-ash hopper; 13-telescopic rod; 14-support frame; 15-muffler; 16-buckle. DETAILED DESCRIPTION

[0018] The following specific embodiments may be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments. The embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0019] like Figure 1-7As shown, a trough cleaning and dust removal device for asphalt pavement maintenance provided by an embodiment of the present invention includes a housing 1 and a fan 2 and a multi-stage dust removal assembly therein, wherein the fan 2 and the multi-stage dust removal assembly are connected via a ventilation duct 3, a dust suction pipe 4 and an air outlet are provided at the upper portion of the housing 1, and an openable discharge port is provided at the bottom, the dust suction pipe 4 is connected to the air inlet at the head end of the multi-stage dust removal assembly, and the end of the multi-stage dust removal assembly is connected to the air outlet via the fan 2 and the ventilation duct 3; the multi-stage dust removal assembly can remove dust generated by road maintenance trough cleaning in descending order according to the particle size, and is used to classify and capture dust with a particle size of 0.0025 mm and above. The present invention can classify the captured dust according to the particle size, which is beneficial to the recycling and reuse of pavement materials, while effectively reducing dust emissions, protecting the construction site environment, and benefiting the health of workers.

[0020] During the specific production, the box body 1 has a rectangular structure, with a support frame 14 inside and a wrapping plate outside; the dust suction pipe 4 is a 5 mm corrugated pipe. At the same time, a rain cap 11 is installed at the air outlet on the top of the box body 1, and an ash hopper 12 is provided at the bottom of the box body 1. The dust discharge ports of the secondary dust removal unit 200 and the tertiary dust removal unit 300 are both connected to the corresponding chambers in the ash hopper 12. The dust discharge port of the secondary dust removal unit 200 is provided with a switchable third discharge door, which is connected to the side wall of the box body 1 through a telescopic rod 13; the bottom discharge port of the ash hopper 12 is provided with a switchable first discharge door 5, one end of the first discharge door 5 is hinged to the bottom of the box body 1, and the other end is connected to the side wall of the box body 1 through a buckle 16. The dust collected by the tertiary dust removal unit can be unloaded by opening the buckle, and then the dust collected by the secondary dust removal unit can be unloaded by opening the third discharge door.

[0021] As a preferred structure, Figure 2 As shown, the multi-stage dust removal assembly includes a primary dust removal unit 100, a secondary dust removal unit 200 and a tertiary dust removal unit 300. The top air inlet of the primary dust removal unit 100 is connected to the dust suction pipe 4. The bottom of the primary dust removal unit 100 is provided with a switchable second discharge door 6. The exhaust port of the primary dust removal unit 100 is connected to the air inlet of the secondary dust removal unit 200; the bottom dust discharge port of the secondary dust removal unit 200 is connected to the discharge port, and the exhaust port of the secondary dust removal unit 200 is connected to the air inlet of the tertiary dust removal unit 300; the bottom dust discharge port of the tertiary dust removal unit 300 is connected to the discharge port, and the exhaust port of the tertiary dust removal unit 300 is connected to the air outlet through the fan 2. In the specific production, one end of the second discharge door 6 is hinged to the bottom of the box body 1, and the two sides are respectively connected to the external side wall of the box body 1 through the telescopic rod 13, and the second discharge door 6 is arranged on the outside of the side of the box body 1. The primary dust removal unit captures large dust particles and drops them to the bottom. After the large dust particles are collected, the second discharge port below can be opened through the telescopic rod to discharge the dust.

[0022] In a specific embodiment of the present invention, Figure 1 , 3 As shown, the primary dust removal unit 100 includes a dust removal arc plate 7 and a gravity dust removal box 8, the dust removal arc plate 7 is arranged above the gravity dust removal box 8, the dust removal arc plate 7 is an upright U-shaped plate, the open end of the dust removal arc plate 7 is connected to the inner wall of the box body 1, and is surrounded to form a channel with a U-shaped cross section; the upper end of the dust removal arc plate 7 is sealed and connected to the top wall of the box body 1, the inlet of the dust removal arc plate 7 is connected to the dust suction pipe 4 and is arranged at the upper part of the side wall of the box body 1, the inlet of the dust removal arc plate 7 is tangent to its side wall, and the lower end outlet of the dust removal arc plate 7 extends into the gravity dust removal box 8; the inlet cross-sectional size of the gravity dust removal box 8 is larger than the outlet cross-sectional size of the dust removal arc plate 7, the bottom dust exhaust port of the gravity dust removal box 8 is connected to the discharge port, and the exhaust port of the gravity dust removal box 8 is connected to the air inlet of the secondary dust removal unit 200. The gravity dust box is a rectangular shell, the bottom of which is an inclined plane opposite to the dust collection pipe, and the dust outlet is arranged at the lower end of the inclined plane of the gravity dust box. The dust sucked into the dust collection pipe enters along the side wall of the dust collection arc plate, and then centrifuges along the arc surface of the dust collection arc plate. The large-sized dust in the airflow is separated from the airflow due to inertia; the function of the gravity dust box is to expand the ventilation cross-sectional area, reduce the wind speed, and reduce the kinetic energy of the dust particles, so that the larger-sized dust particles settle by gravity, achieving the effect of primary dust removal.

[0023] When designing specifically, Figure 3 , 5 As shown, the secondary dust removal unit 200 includes a plurality of cyclone dust collectors 9, the air inlets of the plurality of cyclone dust collectors 9 are connected in parallel with the exhaust outlet of the gravity dust box 8 through ventilation ducts, the exhaust outlets of the plurality of cyclone dust collectors 9 are connected with the discharge outlet, and the exhaust outlets of the plurality of cyclone dust collectors 9 are connected with the air inlet of the tertiary dust collector 300 through ventilation ducts. Since the cyclone dust collector requires the air inlet wind speed to be no more than 20m / s, and the use of a single cyclone dust collector requires a higher height to meet the dust removal effect, in order to reduce the air inlet wind speed and reduce the height of the instrument, two cyclone dust collectors are used in parallel. The dust particles settled by the primary dust removal unit continue to enter the cyclone dust collector through the action of the airflow. The cyclone dust collector causes the dust-containing airflow to rotate, and uses centrifugal force to separate the dust particles from the airflow and capture them on the wall of the device, and then uses gravity to make the dust particles fall into the ash hopper below.

[0024] exist Figure 5In the embodiment shown, the three-stage dust removal unit 300 uses a filter cartridge dust collector 10, the exhaust port of the filter cartridge dust collector 10 is connected to the inlet of the fan 2, the outlet of the fan 2 is connected to the outlet; the exhaust port of the filter cartridge dust collector 10 is connected to the discharge port. The filtration accuracy of the filter cartridge dust collector 10 is 0.0025mm, and a muffler 14 is provided on the ventilation duct 3 between the exhaust port of the filter cartridge dust collector 10 and the fan 2, and between the fan 2 and the outlet. In specific application, after the cyclone dust collector is used for dust removal, the two cyclone dust collector outlets are merged into one, and the fan draws the airflow mixed with fine dust into the filter cartridge dust collector under negative pressure, and the filter cartridge dust collector performs three-stage dust removal. Since the improvement of the filter cartridge dust collector's accuracy will enhance the dust removal effect of the dust removal system, and the airflow resistance in the dust removal system will also be greatly increased, in order to ensure the dust removal effect while avoiding excessive airflow resistance, a filter cartridge with a filtration accuracy of 0.0025mm is selected. The resistance of the airflow through the filter cartridge dust collector increases with the thickness of the dust on the filter material surface. Therefore, dust removal is required when the resistance reaches a certain level, otherwise the airflow of the entire dust removal device will be affected. When cleaning, the filter airflow will be closed, and the electromagnetic pulse compressed air will expand rapidly in the box in a very short time and flow into the filter cartridge dust collector, causing the filter cartridge to expand and deform to vibrate, and under the action of the reverse airflow, the dust attached to the outer surface of the filter bag is peeled off and falls into the ash hopper.

[0025] like Figure 5 As shown, three separate ash hoppers 12 are arranged below the secondary dust removal unit and the tertiary dust removal unit, corresponding to the two cyclone dust collectors and the cartridge dust collector respectively. After dust removal is completed, the first discharge port below can be opened to discharge the dust accumulated in the ash hoppers of the secondary and tertiary dust removal devices separately. The ash hopper is designed to be easy to disassemble, which is helpful for cleaning after use.

[0026] The relevant designs in the present invention are as follows: 1. Design description of ventilation ducts: The tank cleaning and dust removal device mainly absorbs the gas in the ventilation duct through the fan, and discharges the gas through the air outlet to generate airflow. The air outlet is equipped with a rainproof cap, which can effectively prevent rainwater from flowing into the device without affecting the exhaust. A muffler is designed on the inlet and outlet ventilation ducts connected to the fan to reduce the noise generated by the high-speed airflow. The air inlet of the fan is connected to the filter cartridge dust collector of the three-stage dust removal unit to extract the gas in the filter cartridge dust collector. The air pressure difference drives the secondary dust removal unit and the dust suction port to generate a sufficiently large airflow. The dust suction pipe uses a 5 mm corrugated pipe to inhale the airflow with dust particles.

[0027] 2. Design description of the fan: When selecting the fan, the flow simulation of the tank cleaning and dust removal device is performed, and the size of the resistance of the fan can be obtained from the flow velocity results. When designing the fan, it is necessary to consider the power and drive mode (motor, etc.) to overcome the resistance to meet the outlet volume flow rate of 2030m³ / h. Since the filter cartridge filtration in the three-stage dust removal unit will also increase the air flow resistance in the dust removal system, and the filter cartridge has high precision during fluid simulation, it is difficult to achieve complete simulation, so the filter cartridge simulation is not performed. Therefore, when designing the fan, it is necessary to comprehensively consider the filter cartridge pressure to design so that the device can meet: fan power × 85% ≥ fan flow × fan resistance.

[0028] The parameters are set as follows: Fluid: air; outlet volume flow: 2030m³ / h; inlet is ambient pressure; Wall surface conditions: The roughness of the inner wall of the fan is 50μm, and the roughness of the inner wall of the ventilation duct is 5000μm; Gravity acceleration: Y direction -9.8N / ㎡; Turbulence intensity: 3%; Turbulence length: 0.007325m; Particle analysis normal recovery condition coefficient: 0.58; Particle analysis tangential recovery condition coefficient: 0.64.

[0029] The inlet diameter of the trough cleaning and dust removal device determines the cross-sectional area, and then the fan flow is calculated in combination with the required cross-sectional wind speed determined by the size of the absorbed dust particles. In order to ensure the fan flow, the fan pressure needs to be determined according to the resistance inside the fan box. The fan power can be calculated from the fan pressure to complete the design of the fan.

[0030] The design results are as follows: 1. Flow trajectory and relative pressure simulation analysis In order to determine the power of the fan, fluid simulation is required to determine the suction port flow rate and fan pressure. The following is the fluid simulation result.

[0031] The flow rate results are as follows Figure 8 As shown, the pressure results are as follows Fig. 9 shown.

[0032] 2. Particle Analysis The present invention classifies particles according to their diameters, performs fluid simulation on particles of different diameters in a dust removal system, and analyzes the capture of particles of different diameters by the dust removal system based on a velocity trend diagram of the particles in the fluid.

[0033] The dust removal effects are as follows: The simulation results of particle velocity with a diameter of 1 mm are as follows: Fig.10As shown in the figure, from the simulation results, it can be seen that particles with a diameter of 1mm can achieve a good dust removal effect after passing through the first-level dust removal unit and basically will not enter the second-level dust removal unit.

[0034] The simulation results of particle velocity with a diameter of 0.1 mm are as follows: Fig.11 As shown in the figure, from the simulation results, it can be seen that after 200 0.1mm particles are injected and enter the primary dust removal unit with the airflow, some of them will settle, and a small part of the particles will enter the cyclone dust collector of the secondary dust removal unit with the airflow. After passing through the secondary dust removal unit, all the particles are captured and do not enter the tertiary dust removal unit.

[0035] The simulation results of particle velocity (PM10) with a diameter of 0.01 mm are as follows Fig.12 As shown in the figure, it can be seen from the simulation results that compared with 0.1mm particles, the proportion of 0.01mm particles captured by the secondary cyclone dust collector increases, but they still do not enter the tertiary dust removal unit.

[0036] The simulation results of particle velocity (PM5) with a diameter of 0.005 mm are as follows Fig.13 As shown in the figure, from the simulation results, it can be seen that compared with 0.01mm particles (PM10), 0.005mm particles (PM5) are captured more by the secondary cyclone dust removal unit, and the secondary dust removal unit does not completely capture the particles. A small amount of particles enter the dust filter cartridge of the tertiary dust removal unit with the airflow and are finally captured by the dust filter barrel.

[0037] The simulation results of particle velocity (PM2.5) with a diameter of 0.0025 mm are as follows Fig.14 As shown in the figure, from the simulation results, it can be seen that compared with 0.005mm particles (PM5), 0.0025mm particles (PM2.5) pass through the primary dust removal unit and the secondary dust removal unit and enter the dust filter barrel of the tertiary dust removal unit in large quantities and are captured by the dust filter barrel.

[0038] 3. Analysis of the function of dust removal arc plate The use of dust removal arc plates can reduce the degree of turbulence of the airflow in the gravity dust removal box, so that the airflow rotates downward in a unified and orderly manner, which is conducive to the separation of materials and makes it difficult for the materials to be rolled up again. The airflow after separation can enter the secondary dust removal unit more efficiently, which can reduce the volume of the gravity dust removal box by half, making the device more convenient and easier to assemble. The following simulation compares and analyzes the changes in the dust removal efficiency of the device before and after the dust removal arc plates are set.

[0039] Simulation analysis of the dust removal arc plate: When other devices remain the same, a comparison simulation is performed between the device with the dust removal arc plate and the device without the dust removal arc plate. Fig.15 , 16As shown. During the simulation, 250 particles with diameters of 0.0025mm (PM2.5), 0.005mm (PM5), 0.0075mm (PM7.5), 0.01mm, and 0.1mm were set at the inlet of the device, for a total of 1500 particles. During the simulation process, it can be seen that after high-speed particles enter the two settings, the particle speed of the device with the dust removal arc plate decreases faster, and after being dusted by the two devices respectively, the device without the dust removal arc plate discharges 124 0.005mm particles and 242 0.0025mm particles at the outlet, for a total of 366 particles, while the device with the dust removal arc plate discharges 19 0.005mm particles and 189 0.0025mm particles at the outlet, for a total of 208 particles.

[0040] From the simulation results, it can be seen that the dust removal efficiency of the device with dust removal arc plates for 0.005mm particles is increased by 42.0% compared with the dust removal efficiency of the device without dust removal arc plates, and the dust removal efficiency of 0.0025mm particles is increased by 21.2%. Since the device in the simulation process does not simulate the filter cartridge, 0.0025mm and 0.005mm particles will eventually be captured by the filter cartridge. The resistance of the filter cartridge is closely related to the dust accumulation on the filter cartridge. In order to avoid excessive resistance, the more particles captured by the filter cartridge, the more times the filter cartridge needs to be cleaned when the device captures the same number of particles. In order to ensure the high efficiency of the dust removal device, the number of times the filter cartridge needs to be cleaned needs to be reduced. The setting of the dust removal arc plate can effectively reduce the number of particles flowing into the filter cartridge, and the number of cleanings can be effectively reduced under the same working conditions.

[0041] 4. Dust Removal Efficiency Simulation of the Present Invention The present invention performs dust removal efficiency simulation as follows Fig.17 As shown, 100 particles of diameters of 0.0025mm (PM2.5), 0.005mm (PM5), 0.01mm (PM10), 0.1mm, 1mm, and 50mm are placed at the mouth of the dust suction pipe, with a total of 700 particles, and the gas volume flow rate at the dust suction port is 0.5692m³ / s. After dust removal by the dust removal system without a filter cartridge, the number of particles at the outlet is measured to be 94, of which all particles with a diameter greater than 0.005mm (PM5) are captured, 8 particles of 0.005mm (PM5), 86 particles of 0.0025mm (PM2.5), and the gas volume flow rate at the outlet is -0.5936m³ / s. The above results show that the dust removal device provided by the present invention can capture both large-diameter particles and small-diameter particles, and can collect dust particles of different diameters through different ash hoppers. It not only meets the dust removal requirements during road maintenance, milling and grooving, but also lays the foundation for the recycling of road materials.

[0042] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A trough cleaning and dust removal device for asphalt pavement maintenance, characterized in that: It includes a box body and a fan and a multi-stage dust removal component inside it, the fan and the multi-stage dust removal component are connected through a ventilation duct, the upper part of the box body is provided with a dust suction pipe and an air outlet, and the bottom is provided with an openable discharge port, the dust suction pipe is connected to the front end air inlet of the multi-stage dust removal component, and the rear end of the multi-stage dust removal component is connected to the air outlet through the fan and the ventilation duct; the multi-stage dust removal component can remove the dust generated by road maintenance trough cleaning in order from large to small according to the particle size, and is used to classify and capture dust with a particle size of 0.0025mm and above.

2. The groove cleaning and dust removal device for asphalt pavement maintenance according to claim 1 is characterized in that: The multi-stage dust removal assembly includes a primary dust removal unit, a secondary dust removal unit and a tertiary dust removal unit. The top air inlet of the primary dust removal unit is connected to the dust suction pipe, the bottom of the primary dust removal unit is provided with a switchable second unloading door, the exhaust port of the primary dust removal unit is connected to the air inlet of the secondary dust removal unit; the bottom dust exhaust port of the secondary dust removal unit is connected to the unloading port, the exhaust port of the secondary dust removal unit is connected to the air inlet of the tertiary dust removal unit; the bottom dust exhaust port of the tertiary dust removal unit is connected to the unloading port, and the exhaust port of the tertiary dust removal unit is connected to the air outlet through a fan.

3. The trough cleaning and dust removal device for asphalt pavement maintenance according to claim 2 is characterized in that: The primary dust removal unit includes a dust removal arc plate and a gravity dust removal box. The dust removal arc plate is arranged above the gravity dust removal box. The dust removal arc plate is an upright U-shaped plate. The open end of the dust removal arc plate is connected to the inner wall of the box body and surrounded to form a channel with a U-shaped cross section; the upper end of the dust removal arc plate is sealed and connected to the top wall of the box body, the inlet of the dust removal arc plate is connected to the dust suction pipe and is arranged at the upper part of the side wall of the box body, the inlet of the dust removal arc plate is tangent to the side wall, and the lower end outlet of the dust removal arc plate extends into the gravity dust removal box; the inlet cross-sectional size of the gravity dust removal box is larger than the outlet cross-sectional size of the dust removal arc plate, the bottom dust exhaust port of the gravity dust removal box is connected to the discharge port, and the exhaust port of the gravity dust removal box is connected to the air inlet of the secondary dust removal unit.

4. The trough cleaning and dust removal device for asphalt pavement maintenance according to claim 2 is characterized in that: The secondary dust removal unit includes multiple cyclone dust collectors, the air inlets of the multiple cyclone dust collectors are connected in parallel with the exhaust outlet of the gravity dust removal box through ventilation ducts, the dust exhaust outlets of the multiple cyclone dust collectors are connected to the discharge port, and the exhaust outlets of the multiple cyclone dust collectors are connected to the air inlet of the tertiary dust removal unit through ventilation ducts.

5. The trough cleaning and dust removal device for asphalt pavement maintenance according to claim 2 is characterized in that: The three-stage dust removal unit is a cartridge dust collector, the air outlet of the cartridge dust collector is connected to the fan inlet, the fan outlet is connected to the air outlet; the dust outlet of the cartridge dust collector is connected to the discharge port.

6. The trough cleaning and dust removal device for asphalt pavement maintenance according to claim 5, characterized in that: The filtration accuracy of the cartridge dust collector is 0.0025mm, and silencers are provided between the exhaust port and the fan, and between the fan and the air outlet of the cartridge dust collector.

7. The trough cleaning and dust removal device for asphalt pavement maintenance according to claim 1 is characterized in that: The box body has a rectangular parallelepiped structure, and the dust suction pipe is a 5 mm corrugated pipe.

8. The trough cleaning and dust removal device for asphalt pavement maintenance according to claim 1, characterized in that: The air outlet at the top of the box body is provided with a rainproof cap, and the bottom of the box body is provided with an ash hopper. The dust exhaust ports of the secondary dust removal unit and the tertiary dust removal unit are both connected to the corresponding chambers in the ash hopper. The dust exhaust port of the secondary dust removal unit is provided with a switchable third unloading door, and the bottom unloading port of the ash hopper is provided with a switchable first unloading door, one end of the first unloading door is hinged to the bottom of the box body, and the other end is connected to the side wall of the box body by a snap.

9. A groove cleaning and dust removal device for asphalt pavement maintenance according to any one of claims 1 to 8, characterized in that: One end of the second discharge door at the bottom of the primary dust removal unit is hinged to the bottom of the box body, and the other end is connected to the outer side wall of the box body through a telescopic rod.

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